From patchwork Sat Dec 18 00:17:51 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Gwendal Grignou X-Patchwork-Id: 12685815 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 5A22CC433F5 for ; Sat, 18 Dec 2021 00:18:02 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S229890AbhLRASC (ORCPT ); Fri, 17 Dec 2021 19:18:02 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:37872 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229643AbhLRASB (ORCPT ); Fri, 17 Dec 2021 19:18:01 -0500 Received: from mail-pl1-x62c.google.com (mail-pl1-x62c.google.com [IPv6:2607:f8b0:4864:20::62c]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 6F997C061574 for ; Fri, 17 Dec 2021 16:18:01 -0800 (PST) Received: by mail-pl1-x62c.google.com with SMTP id z6so3184595plk.6 for ; Fri, 17 Dec 2021 16:18:01 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=chromium.org; s=google; h=from:to:cc:subject:date:message-id:in-reply-to:references :mime-version:content-transfer-encoding; bh=n1Ah5Zztvnex632L5hNGE1D5LGM2AwbYrtX8qX3YoWQ=; b=ByjVD6D6YtD4wmIf7zMo8eCvhvrUnt++ya9lR98oPsQvCxwvQbNQA9gP2TNihBpyW5 /AU8k4gjZZPK5JW/pKMkVX7jfk3LvxGmuG7xOpYds0pF8U4KpLo+3UTTycT6OLi007fY zX/B6/PzK+d2SqXU5t/8+ERGqIqJm8iBZDlJ0= X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=x-gm-message-state:from:to:cc:subject:date:message-id:in-reply-to :references:mime-version:content-transfer-encoding; bh=n1Ah5Zztvnex632L5hNGE1D5LGM2AwbYrtX8qX3YoWQ=; b=bIjRTUJb1d1fgAzfSjJeiC14buNOpayyvegLorBZ+hYI6jZrX58uauHEx+t9FZNdB/ n5uq8SQH5jlfcBaqktCNe+kmgxle6EnKAkK+79fy5RvCWO32bghPtN3bleCT4XjNpb3F wz6BjfMkZSjUBc0D7epLhMxmYknVI0PaM1yY20qCf8PrxhnmvNrIh6JBkIDdlvgbh3It m6J9t2WsbN8JzogkMLs9GtCsXpoPs5uHw8oh1luWXyz3549F8sJE32nlBLOKomf+Ju0I 5Hqs7fw/kXcn1DfzAcsTOXnlVygD4DOl56Ocjnod0Pqg8dwjYZ90PA/qSn3mLPxnTKXm CbBw== X-Gm-Message-State: AOAM530U7l6sRA6C2kbQpUqthZMqMChWLWMTOcDy2mD9MfWD13UcJR+A xGzHBceckkMvzuVAT+wgPFP56seqWhIvPw== X-Google-Smtp-Source: ABdhPJwFSNrDgUV24BPnOu2w3zJKr975wODd2qq90bJPhutSFRYk7lfACMoXSwtBFNjxoAWyfUC7ww== X-Received: by 2002:a17:903:4041:b0:148:b052:45ba with SMTP id n1-20020a170903404100b00148b05245bamr5394960pla.130.1639786680956; Fri, 17 Dec 2021 16:18:00 -0800 (PST) Received: from localhost ([2620:15c:202:201:2bc8:cefc:f407:829]) by smtp.gmail.com with UTF8SMTPSA id x6sm9350209pga.14.2021.12.17.16.18.00 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Fri, 17 Dec 2021 16:18:00 -0800 (PST) From: Gwendal Grignou To: jic23@kernel.org, lars@metafoo.de, swboyd@chromium.org Cc: linux-iio@vger.kernel.org, Gwendal Grignou Subject: [PATCH v8 1/5] iio: sx9310: Add frequency in read_avail Date: Fri, 17 Dec 2021 16:17:51 -0800 Message-Id: <20211218001755.3096807-2-gwendal@chromium.org> X-Mailer: git-send-email 2.34.1.173.g76aa8bc2d0-goog In-Reply-To: <20211218001755.3096807-1-gwendal@chromium.org> References: <20211218001755.3096807-1-gwendal@chromium.org> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-iio@vger.kernel.org Instead of using IIO_DEV_ATTR_SAMP_FREQ_AVAIL sysfs attribute, add a _FREQ case in read_avail() to display the frequency table. No change to |sampling_frequency_available| was observed. Signed-off-by: Gwendal Grignou Reviewed-by: Stephen Boyd --- No changes in v8 No changes in v7 No changes in v6 No changes in v5 No changes in v4 No changes in v3 New in v2. drivers/iio/proximity/sx9310.c | 33 +++++++-------------------------- 1 file changed, 7 insertions(+), 26 deletions(-) diff --git a/drivers/iio/proximity/sx9310.c b/drivers/iio/proximity/sx9310.c index a3fdb59b06d220..1647268b6471f1 100644 --- a/drivers/iio/proximity/sx9310.c +++ b/drivers/iio/proximity/sx9310.c @@ -196,6 +196,8 @@ static const struct iio_event_spec sx9310_events[] = { .info_mask_shared_by_all = BIT(IIO_CHAN_INFO_SAMP_FREQ), \ .info_mask_separate_available = \ BIT(IIO_CHAN_INFO_HARDWAREGAIN), \ + .info_mask_shared_by_all_available = \ + BIT(IIO_CHAN_INFO_SAMP_FREQ), \ .indexed = 1, \ .channel = idx, \ .extend_name = name, \ @@ -251,22 +253,6 @@ static const unsigned int sx9310_scan_period_table[] = { 400, 600, 800, 1000, 2000, 3000, 4000, 5000, }; -static ssize_t sx9310_show_samp_freq_avail(struct device *dev, - struct device_attribute *attr, - char *buf) -{ - size_t len = 0; - int i; - - for (i = 0; i < ARRAY_SIZE(sx9310_samp_freq_table); i++) - len += scnprintf(buf + len, PAGE_SIZE - len, "%d.%d ", - sx9310_samp_freq_table[i].val, - sx9310_samp_freq_table[i].val2); - buf[len - 1] = '\n'; - return len; -} -static IIO_DEV_ATTR_SAMP_FREQ_AVAIL(sx9310_show_samp_freq_avail); - static const struct regmap_range sx9310_writable_reg_ranges[] = { regmap_reg_range(SX9310_REG_IRQ_MSK, SX9310_REG_IRQ_FUNC), regmap_reg_range(SX9310_REG_PROX_CTRL0, SX9310_REG_PROX_CTRL19), @@ -562,6 +548,11 @@ static int sx9310_read_avail(struct iio_dev *indio_dev, *length = ARRAY_SIZE(sx9310_gain_vals); *vals = sx9310_gain_vals; return IIO_AVAIL_LIST; + case IIO_CHAN_INFO_SAMP_FREQ: + *type = IIO_VAL_INT_PLUS_MICRO; + *length = ARRAY_SIZE(sx9310_samp_freq_table) * 2; + *vals = (int *)sx9310_samp_freq_table; + return IIO_AVAIL_LIST; } return -EINVAL; @@ -1031,17 +1022,7 @@ static int sx9310_write_event_config(struct iio_dev *indio_dev, return ret; } -static struct attribute *sx9310_attributes[] = { - &iio_dev_attr_sampling_frequency_available.dev_attr.attr, - NULL -}; - -static const struct attribute_group sx9310_attribute_group = { - .attrs = sx9310_attributes, -}; - static const struct iio_info sx9310_info = { - .attrs = &sx9310_attribute_group, .read_raw = sx9310_read_raw, .read_avail = sx9310_read_avail, .read_event_value = sx9310_read_event_val, From patchwork Sat Dec 18 00:17:52 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Gwendal Grignou X-Patchwork-Id: 12685817 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id E1D5AC433EF for ; Sat, 18 Dec 2021 00:18:04 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S229904AbhLRASE (ORCPT ); Fri, 17 Dec 2021 19:18:04 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:37886 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229643AbhLRASD (ORCPT ); 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The change adds a bidirectional interface between sx93xx and sx_common. The change is quite mechanical, as the impacted functions are moved and renamed. Signed-off-by: Gwendal Grignou Reviewed-by: Stephen Boyd --- Changes in v8: - Remove a dev_err() at probe time. - Use dev_get_drvdata to access iio device structure. - Document Kconfig. No changes in v7 No changes in v6. Changes in v5: - Add offset to process irq status register - Fix includes with iwyu - Fix long line - Use dev_err_probe(), remove dev_err() in whoami routine. Changes in v4: - Fix credit in sx_common.c - Use chip_info instead of info in common data structure. - Remove unnecessary includes in sx_common.c - Remove WHOAMI register values from sx_common.h - Fix kerneldoc comments. Changes in v3: - No line change in Makefile - Leave interrupt.h include, needed at suspend/resume. Changes in v2: - Add Kconfig/Makefile that were in the wrong patch - Define a better interface between common code and driver code - Move back read_avail() to driver code: As it now contains frequency table, it will differ from sensor to sensor. - Check whoami and set driver name back in the driver code. - Use a common probe routine. - Fix kernel doc comments. drivers/iio/proximity/Kconfig | 6 + drivers/iio/proximity/Makefile | 1 + drivers/iio/proximity/sx9310.c | 688 +++++------------------------- drivers/iio/proximity/sx_common.c | 576 +++++++++++++++++++++++++ drivers/iio/proximity/sx_common.h | 163 +++++++ 5 files changed, 844 insertions(+), 590 deletions(-) create mode 100644 drivers/iio/proximity/sx_common.c create mode 100644 drivers/iio/proximity/sx_common.h diff --git a/drivers/iio/proximity/Kconfig b/drivers/iio/proximity/Kconfig index 7c7203ca3ac638..027712684835b9 100644 --- a/drivers/iio/proximity/Kconfig +++ b/drivers/iio/proximity/Kconfig @@ -112,11 +112,17 @@ config SRF04 To compile this driver as a module, choose M here: the module will be called srf04. +config SX_COMMON + tristate + help + Common Semtech proximity sensor code. + config SX9310 tristate "SX9310/SX9311 Semtech proximity sensor" select IIO_BUFFER select IIO_TRIGGERED_BUFFER select REGMAP_I2C + select SX_COMMON depends on I2C help Say Y here to build a driver for Semtech's SX9310/SX9311 capacitive diff --git a/drivers/iio/proximity/Makefile b/drivers/iio/proximity/Makefile index cbdac09433eb51..2577fbce4144e5 100644 --- a/drivers/iio/proximity/Makefile +++ b/drivers/iio/proximity/Makefile @@ -14,6 +14,7 @@ obj-$(CONFIG_RFD77402) += rfd77402.o obj-$(CONFIG_SRF04) += srf04.o obj-$(CONFIG_SRF08) += srf08.o obj-$(CONFIG_SX9310) += sx9310.o +obj-$(CONFIG_SX_COMMON) += sx_common.o obj-$(CONFIG_SX9500) += sx9500.o obj-$(CONFIG_VCNL3020) += vcnl3020.o obj-$(CONFIG_VL53L0X_I2C) += vl53l0x-i2c.o diff --git a/drivers/iio/proximity/sx9310.c b/drivers/iio/proximity/sx9310.c index 1647268b6471f1..fe160702ffae47 100644 --- a/drivers/iio/proximity/sx9310.c +++ b/drivers/iio/proximity/sx9310.c @@ -10,11 +10,10 @@ * and in January 2020 by Daniel Campello . */ -#include #include #include #include -#include +#include #include #include #include @@ -22,19 +21,12 @@ #include #include #include -#include -#include - -#include -#include #include -#include -#include -#include -#include + +#include "sx_common.h" /* Register definitions. */ -#define SX9310_REG_IRQ_SRC 0x00 +#define SX9310_REG_IRQ_SRC SX_COMMON_REG_IRQ_SRC #define SX9310_REG_STAT0 0x01 #define SX9310_REG_STAT1 0x02 #define SX9310_REG_STAT1_COMPSTAT_MASK GENMASK(3, 0) @@ -135,83 +127,36 @@ #define SX9310_WHOAMI_VALUE 0x01 #define SX9311_WHOAMI_VALUE 0x02 #define SX9310_REG_RESET 0x7f -#define SX9310_SOFT_RESET 0xde /* 4 hardware channels, as defined in STAT0: COMB, CS2, CS1 and CS0. */ #define SX9310_NUM_CHANNELS 4 -static_assert(SX9310_NUM_CHANNELS < BITS_PER_LONG); - -struct sx9310_data { - /* Serialize access to registers and channel configuration */ - struct mutex mutex; - struct i2c_client *client; - struct iio_trigger *trig; - struct regmap *regmap; - struct regulator_bulk_data supplies[2]; - /* - * Last reading of the proximity status for each channel. - * We only send an event to user space when this changes. - */ - unsigned long chan_prox_stat; - bool trigger_enabled; - /* Ensure correct alignment of timestamp when present. */ - struct { - __be16 channels[SX9310_NUM_CHANNELS]; - s64 ts __aligned(8); - } buffer; - /* Remember enabled channels and sample rate during suspend. */ - unsigned int suspend_ctrl0; - struct completion completion; - unsigned long chan_read; - unsigned long chan_event; - unsigned int whoami; -}; - -static const struct iio_event_spec sx9310_events[] = { - { - .type = IIO_EV_TYPE_THRESH, - .dir = IIO_EV_DIR_RISING, - .mask_shared_by_all = BIT(IIO_EV_INFO_PERIOD), - }, - { - .type = IIO_EV_TYPE_THRESH, - .dir = IIO_EV_DIR_FALLING, - .mask_shared_by_all = BIT(IIO_EV_INFO_PERIOD), - }, - { - .type = IIO_EV_TYPE_THRESH, - .dir = IIO_EV_DIR_EITHER, - .mask_separate = BIT(IIO_EV_INFO_ENABLE) | - BIT(IIO_EV_INFO_HYSTERESIS) | - BIT(IIO_EV_INFO_VALUE), - }, -}; - -#define SX9310_NAMED_CHANNEL(idx, name) \ - { \ - .type = IIO_PROXIMITY, \ - .info_mask_separate = BIT(IIO_CHAN_INFO_RAW) | \ - BIT(IIO_CHAN_INFO_HARDWAREGAIN), \ - .info_mask_shared_by_all = BIT(IIO_CHAN_INFO_SAMP_FREQ), \ - .info_mask_separate_available = \ - BIT(IIO_CHAN_INFO_HARDWAREGAIN), \ - .info_mask_shared_by_all_available = \ - BIT(IIO_CHAN_INFO_SAMP_FREQ), \ - .indexed = 1, \ - .channel = idx, \ - .extend_name = name, \ - .address = SX9310_REG_DIFF_MSB, \ - .event_spec = sx9310_events, \ - .num_event_specs = ARRAY_SIZE(sx9310_events), \ - .scan_index = idx, \ - .scan_type = { \ - .sign = 's', \ - .realbits = 12, \ - .storagebits = 16, \ - .endianness = IIO_BE, \ - }, \ - } +static_assert(SX9310_NUM_CHANNELS <= SX_COMMON_MAX_NUM_CHANNELS); + +#define SX9310_NAMED_CHANNEL(idx, name) \ +{ \ + .type = IIO_PROXIMITY, \ + .info_mask_separate = BIT(IIO_CHAN_INFO_RAW) | \ + BIT(IIO_CHAN_INFO_HARDWAREGAIN), \ + .info_mask_shared_by_all = BIT(IIO_CHAN_INFO_SAMP_FREQ), \ + .info_mask_separate_available = \ + BIT(IIO_CHAN_INFO_HARDWAREGAIN), \ + .info_mask_shared_by_all_available = \ + BIT(IIO_CHAN_INFO_SAMP_FREQ), \ + .indexed = 1, \ + .channel = idx, \ + .extend_name = name, \ + .address = SX9310_REG_DIFF_MSB, \ + .event_spec = sx_common_events, \ + .num_event_specs = ARRAY_SIZE(sx_common_events), \ + .scan_index = idx, \ + .scan_type = { \ + .sign = 's', \ + .realbits = 12, \ + .storagebits = 16, \ + .endianness = IIO_BE, \ + }, \ +} #define SX9310_CHANNEL(idx) SX9310_NAMED_CHANNEL(idx, NULL) static const struct iio_chan_spec sx9310_channels[] = { @@ -306,64 +251,7 @@ static const struct regmap_config sx9310_regmap_config = { .volatile_table = &sx9310_volatile_regs, }; -static int sx9310_update_chan_en(struct sx9310_data *data, - unsigned long chan_read, - unsigned long chan_event) -{ - int ret; - unsigned long channels = chan_read | chan_event; - - if ((data->chan_read | data->chan_event) != channels) { - ret = regmap_update_bits(data->regmap, SX9310_REG_PROX_CTRL0, - SX9310_REG_PROX_CTRL0_SENSOREN_MASK, - channels); - if (ret) - return ret; - } - data->chan_read = chan_read; - data->chan_event = chan_event; - return 0; -} - -static int sx9310_get_read_channel(struct sx9310_data *data, int channel) -{ - return sx9310_update_chan_en(data, data->chan_read | BIT(channel), - data->chan_event); -} - -static int sx9310_put_read_channel(struct sx9310_data *data, int channel) -{ - return sx9310_update_chan_en(data, data->chan_read & ~BIT(channel), - data->chan_event); -} - -static int sx9310_get_event_channel(struct sx9310_data *data, int channel) -{ - return sx9310_update_chan_en(data, data->chan_read, - data->chan_event | BIT(channel)); -} - -static int sx9310_put_event_channel(struct sx9310_data *data, int channel) -{ - return sx9310_update_chan_en(data, data->chan_read, - data->chan_event & ~BIT(channel)); -} - -static int sx9310_enable_irq(struct sx9310_data *data, unsigned int irq) -{ - if (!data->client->irq) - return 0; - return regmap_update_bits(data->regmap, SX9310_REG_IRQ_MSK, irq, irq); -} - -static int sx9310_disable_irq(struct sx9310_data *data, unsigned int irq) -{ - if (!data->client->irq) - return 0; - return regmap_update_bits(data->regmap, SX9310_REG_IRQ_MSK, irq, 0); -} - -static int sx9310_read_prox_data(struct sx9310_data *data, +static int sx9310_read_prox_data(struct sx_common_data *data, const struct iio_chan_spec *chan, __be16 *val) { int ret; @@ -379,7 +267,7 @@ static int sx9310_read_prox_data(struct sx9310_data *data, * If we have no interrupt support, we have to wait for a scan period * after enabling a channel to get a result. */ -static int sx9310_wait_for_sample(struct sx9310_data *data) +static int sx9310_wait_for_sample(struct sx_common_data *data) { int ret; unsigned int val; @@ -395,66 +283,7 @@ static int sx9310_wait_for_sample(struct sx9310_data *data) return 0; } -static int sx9310_read_proximity(struct sx9310_data *data, - const struct iio_chan_spec *chan, int *val) -{ - int ret; - __be16 rawval; - - mutex_lock(&data->mutex); - - ret = sx9310_get_read_channel(data, chan->channel); - if (ret) - goto out; - - ret = sx9310_enable_irq(data, SX9310_CONVDONE_IRQ); - if (ret) - goto out_put_channel; - - mutex_unlock(&data->mutex); - - if (data->client->irq) { - ret = wait_for_completion_interruptible(&data->completion); - reinit_completion(&data->completion); - } else { - ret = sx9310_wait_for_sample(data); - } - - mutex_lock(&data->mutex); - - if (ret) - goto out_disable_irq; - - ret = sx9310_read_prox_data(data, chan, &rawval); - if (ret) - goto out_disable_irq; - - *val = sign_extend32(be16_to_cpu(rawval), - chan->address == SX9310_REG_DIFF_MSB ? 11 : 15); - - ret = sx9310_disable_irq(data, SX9310_CONVDONE_IRQ); - if (ret) - goto out_put_channel; - - ret = sx9310_put_read_channel(data, chan->channel); - if (ret) - goto out; - - mutex_unlock(&data->mutex); - - return IIO_VAL_INT; - -out_disable_irq: - sx9310_disable_irq(data, SX9310_CONVDONE_IRQ); -out_put_channel: - sx9310_put_read_channel(data, chan->channel); -out: - mutex_unlock(&data->mutex); - - return ret; -} - -static int sx9310_read_gain(struct sx9310_data *data, +static int sx9310_read_gain(struct sx_common_data *data, const struct iio_chan_spec *chan, int *val) { unsigned int regval, gain; @@ -482,7 +311,7 @@ static int sx9310_read_gain(struct sx9310_data *data, return IIO_VAL_INT; } -static int sx9310_read_samp_freq(struct sx9310_data *data, int *val, int *val2) +static int sx9310_read_samp_freq(struct sx_common_data *data, int *val, int *val2) { unsigned int regval; int ret; @@ -502,7 +331,7 @@ static int sx9310_read_raw(struct iio_dev *indio_dev, const struct iio_chan_spec *chan, int *val, int *val2, long mask) { - struct sx9310_data *data = iio_priv(indio_dev); + struct sx_common_data *data = iio_priv(indio_dev); int ret; if (chan->type != IIO_PROXIMITY) @@ -514,7 +343,7 @@ static int sx9310_read_raw(struct iio_dev *indio_dev, if (ret) return ret; - ret = sx9310_read_proximity(data, chan, val); + ret = sx_common_read_proximity(data, chan, val); iio_device_release_direct_mode(indio_dev); return ret; case IIO_CHAN_INFO_HARDWAREGAIN: @@ -577,7 +406,7 @@ static int sx9310_get_thresh_reg(unsigned int channel) return -EINVAL; } -static int sx9310_read_thresh(struct sx9310_data *data, +static int sx9310_read_thresh(struct sx_common_data *data, const struct iio_chan_spec *chan, int *val) { unsigned int reg; @@ -600,7 +429,7 @@ static int sx9310_read_thresh(struct sx9310_data *data, return IIO_VAL_INT; } -static int sx9310_read_hysteresis(struct sx9310_data *data, +static int sx9310_read_hysteresis(struct sx_common_data *data, const struct iio_chan_spec *chan, int *val) { unsigned int regval, pthresh; @@ -624,7 +453,7 @@ static int sx9310_read_hysteresis(struct sx9310_data *data, return IIO_VAL_INT; } -static int sx9310_read_far_debounce(struct sx9310_data *data, int *val) +static int sx9310_read_far_debounce(struct sx_common_data *data, int *val) { unsigned int regval; int ret; @@ -642,7 +471,7 @@ static int sx9310_read_far_debounce(struct sx9310_data *data, int *val) return IIO_VAL_INT; } -static int sx9310_read_close_debounce(struct sx9310_data *data, int *val) +static int sx9310_read_close_debounce(struct sx_common_data *data, int *val) { unsigned int regval; int ret; @@ -666,7 +495,7 @@ static int sx9310_read_event_val(struct iio_dev *indio_dev, enum iio_event_direction dir, enum iio_event_info info, int *val, int *val2) { - struct sx9310_data *data = iio_priv(indio_dev); + struct sx_common_data *data = iio_priv(indio_dev); if (chan->type != IIO_PROXIMITY) return -EINVAL; @@ -690,7 +519,7 @@ static int sx9310_read_event_val(struct iio_dev *indio_dev, } } -static int sx9310_write_thresh(struct sx9310_data *data, +static int sx9310_write_thresh(struct sx_common_data *data, const struct iio_chan_spec *chan, int val) { unsigned int reg; @@ -720,7 +549,7 @@ static int sx9310_write_thresh(struct sx9310_data *data, return ret; } -static int sx9310_write_hysteresis(struct sx9310_data *data, +static int sx9310_write_hysteresis(struct sx_common_data *data, const struct iio_chan_spec *chan, int _val) { unsigned int hyst, val = _val; @@ -750,7 +579,7 @@ static int sx9310_write_hysteresis(struct sx9310_data *data, return ret; } -static int sx9310_write_far_debounce(struct sx9310_data *data, int val) +static int sx9310_write_far_debounce(struct sx_common_data *data, int val) { int ret; unsigned int regval; @@ -771,7 +600,7 @@ static int sx9310_write_far_debounce(struct sx9310_data *data, int val) return ret; } -static int sx9310_write_close_debounce(struct sx9310_data *data, int val) +static int sx9310_write_close_debounce(struct sx_common_data *data, int val) { int ret; unsigned int regval; @@ -798,7 +627,7 @@ static int sx9310_write_event_val(struct iio_dev *indio_dev, enum iio_event_direction dir, enum iio_event_info info, int val, int val2) { - struct sx9310_data *data = iio_priv(indio_dev); + struct sx_common_data *data = iio_priv(indio_dev); if (chan->type != IIO_PROXIMITY) return -EINVAL; @@ -822,7 +651,7 @@ static int sx9310_write_event_val(struct iio_dev *indio_dev, } } -static int sx9310_set_samp_freq(struct sx9310_data *data, int val, int val2) +static int sx9310_set_samp_freq(struct sx_common_data *data, int val, int val2) { int i, ret; @@ -846,8 +675,8 @@ static int sx9310_set_samp_freq(struct sx9310_data *data, int val, int val2) return ret; } -static int sx9310_write_gain(struct sx9310_data *data, - const struct iio_chan_spec *chan, int val) +static int sx9310_write_gain(struct sx_common_data *data, + const struct iio_chan_spec *chan, int val) { unsigned int gain, mask; int ret; @@ -881,7 +710,7 @@ static int sx9310_write_raw(struct iio_dev *indio_dev, const struct iio_chan_spec *chan, int val, int val2, long mask) { - struct sx9310_data *data = iio_priv(indio_dev); + struct sx_common_data *data = iio_priv(indio_dev); if (chan->type != IIO_PROXIMITY) return -EINVAL; @@ -896,238 +725,7 @@ static int sx9310_write_raw(struct iio_dev *indio_dev, return -EINVAL; } -static irqreturn_t sx9310_irq_handler(int irq, void *private) -{ - struct iio_dev *indio_dev = private; - struct sx9310_data *data = iio_priv(indio_dev); - - if (data->trigger_enabled) - iio_trigger_poll(data->trig); - - /* - * Even if no event is enabled, we need to wake the thread to clear the - * interrupt state by reading SX9310_REG_IRQ_SRC. - * It is not possible to do that here because regmap_read takes a mutex. - */ - return IRQ_WAKE_THREAD; -} - -static void sx9310_push_events(struct iio_dev *indio_dev) -{ - int ret; - unsigned int val, chan; - struct sx9310_data *data = iio_priv(indio_dev); - s64 timestamp = iio_get_time_ns(indio_dev); - unsigned long prox_changed; - - /* Read proximity state on all channels */ - ret = regmap_read(data->regmap, SX9310_REG_STAT0, &val); - if (ret) { - dev_err(&data->client->dev, "i2c transfer error in irq\n"); - return; - } - - /* - * Only iterate over channels with changes on proximity status that have - * events enabled. - */ - prox_changed = (data->chan_prox_stat ^ val) & data->chan_event; - - for_each_set_bit(chan, &prox_changed, SX9310_NUM_CHANNELS) { - int dir; - u64 ev; - - dir = (val & BIT(chan)) ? IIO_EV_DIR_FALLING : IIO_EV_DIR_RISING; - ev = IIO_UNMOD_EVENT_CODE(IIO_PROXIMITY, chan, - IIO_EV_TYPE_THRESH, dir); - - iio_push_event(indio_dev, ev, timestamp); - } - data->chan_prox_stat = val; -} - -static irqreturn_t sx9310_irq_thread_handler(int irq, void *private) -{ - struct iio_dev *indio_dev = private; - struct sx9310_data *data = iio_priv(indio_dev); - int ret; - unsigned int val; - - mutex_lock(&data->mutex); - - ret = regmap_read(data->regmap, SX9310_REG_IRQ_SRC, &val); - if (ret) { - dev_err(&data->client->dev, "i2c transfer error in irq\n"); - goto out; - } - - if (val & (SX9310_FAR_IRQ | SX9310_CLOSE_IRQ)) - sx9310_push_events(indio_dev); - - if (val & SX9310_CONVDONE_IRQ) - complete(&data->completion); - -out: - mutex_unlock(&data->mutex); - - return IRQ_HANDLED; -} - -static int sx9310_read_event_config(struct iio_dev *indio_dev, - const struct iio_chan_spec *chan, - enum iio_event_type type, - enum iio_event_direction dir) -{ - struct sx9310_data *data = iio_priv(indio_dev); - - return !!(data->chan_event & BIT(chan->channel)); -} - -static int sx9310_write_event_config(struct iio_dev *indio_dev, - const struct iio_chan_spec *chan, - enum iio_event_type type, - enum iio_event_direction dir, int state) -{ - struct sx9310_data *data = iio_priv(indio_dev); - unsigned int eventirq = SX9310_FAR_IRQ | SX9310_CLOSE_IRQ; - int ret; - - /* If the state hasn't changed, there's nothing to do. */ - if (!!(data->chan_event & BIT(chan->channel)) == state) - return 0; - - mutex_lock(&data->mutex); - if (state) { - ret = sx9310_get_event_channel(data, chan->channel); - if (ret) - goto out_unlock; - if (!(data->chan_event & ~BIT(chan->channel))) { - ret = sx9310_enable_irq(data, eventirq); - if (ret) - sx9310_put_event_channel(data, chan->channel); - } - } else { - ret = sx9310_put_event_channel(data, chan->channel); - if (ret) - goto out_unlock; - if (!data->chan_event) { - ret = sx9310_disable_irq(data, eventirq); - if (ret) - sx9310_get_event_channel(data, chan->channel); - } - } - -out_unlock: - mutex_unlock(&data->mutex); - return ret; -} - -static const struct iio_info sx9310_info = { - .read_raw = sx9310_read_raw, - .read_avail = sx9310_read_avail, - .read_event_value = sx9310_read_event_val, - .write_event_value = sx9310_write_event_val, - .write_raw = sx9310_write_raw, - .read_event_config = sx9310_read_event_config, - .write_event_config = sx9310_write_event_config, -}; - -static int sx9310_set_trigger_state(struct iio_trigger *trig, bool state) -{ - struct iio_dev *indio_dev = iio_trigger_get_drvdata(trig); - struct sx9310_data *data = iio_priv(indio_dev); - int ret = 0; - - mutex_lock(&data->mutex); - - if (state) - ret = sx9310_enable_irq(data, SX9310_CONVDONE_IRQ); - else if (!data->chan_read) - ret = sx9310_disable_irq(data, SX9310_CONVDONE_IRQ); - if (ret) - goto out; - - data->trigger_enabled = state; - -out: - mutex_unlock(&data->mutex); - - return ret; -} - -static const struct iio_trigger_ops sx9310_trigger_ops = { - .set_trigger_state = sx9310_set_trigger_state, -}; - -static irqreturn_t sx9310_trigger_handler(int irq, void *private) -{ - struct iio_poll_func *pf = private; - struct iio_dev *indio_dev = pf->indio_dev; - struct sx9310_data *data = iio_priv(indio_dev); - __be16 val; - int bit, ret, i = 0; - - mutex_lock(&data->mutex); - - for_each_set_bit(bit, indio_dev->active_scan_mask, - indio_dev->masklength) { - ret = sx9310_read_prox_data(data, &indio_dev->channels[bit], - &val); - if (ret) - goto out; - - data->buffer.channels[i++] = val; - } - - iio_push_to_buffers_with_timestamp(indio_dev, &data->buffer, - pf->timestamp); - -out: - mutex_unlock(&data->mutex); - - iio_trigger_notify_done(indio_dev->trig); - - return IRQ_HANDLED; -} - -static int sx9310_buffer_preenable(struct iio_dev *indio_dev) -{ - struct sx9310_data *data = iio_priv(indio_dev); - unsigned long channels = 0; - int bit, ret; - - mutex_lock(&data->mutex); - for_each_set_bit(bit, indio_dev->active_scan_mask, - indio_dev->masklength) - __set_bit(indio_dev->channels[bit].channel, &channels); - - ret = sx9310_update_chan_en(data, channels, data->chan_event); - mutex_unlock(&data->mutex); - return ret; -} - -static int sx9310_buffer_postdisable(struct iio_dev *indio_dev) -{ - struct sx9310_data *data = iio_priv(indio_dev); - int ret; - - mutex_lock(&data->mutex); - ret = sx9310_update_chan_en(data, 0, data->chan_event); - mutex_unlock(&data->mutex); - return ret; -} - -static const struct iio_buffer_setup_ops sx9310_buffer_setup_ops = { - .preenable = sx9310_buffer_preenable, - .postdisable = sx9310_buffer_postdisable, -}; - -struct sx9310_reg_default { - u8 reg; - u8 def; -}; - -static const struct sx9310_reg_default sx9310_default_regs[] = { +static const struct sx_common_reg_default sx9310_default_regs[] = { { SX9310_REG_IRQ_MSK, 0x00 }, { SX9310_REG_IRQ_FUNC, 0x00 }, /* @@ -1172,7 +770,7 @@ static const struct sx9310_reg_default sx9310_default_regs[] = { /* Activate all channels and perform an initial compensation. */ static int sx9310_init_compensation(struct iio_dev *indio_dev) { - struct sx9310_data *data = iio_priv(indio_dev); + struct sx_common_data *data = iio_priv(indio_dev); int ret; unsigned int val; unsigned int ctrl0; @@ -1202,9 +800,9 @@ static int sx9310_init_compensation(struct iio_dev *indio_dev) return ret; } -static const struct sx9310_reg_default * +static const struct sx_common_reg_default * sx9310_get_default_reg(struct device *dev, int idx, - struct sx9310_reg_default *reg_def) + struct sx_common_reg_default *reg_def) { u32 combined[SX9310_NUM_CHANNELS]; u32 start = 0, raw = 0, pos = 0; @@ -1305,47 +903,21 @@ sx9310_get_default_reg(struct device *dev, int idx, return reg_def; } -static int sx9310_init_device(struct iio_dev *indio_dev) +static int sx9310_check_whoami(struct device *dev, + struct iio_dev *indio_dev) { - struct sx9310_data *data = iio_priv(indio_dev); - struct sx9310_reg_default tmp; - const struct sx9310_reg_default *initval; + struct sx_common_data *data = iio_priv(indio_dev); + unsigned int long ddata; + unsigned int whoami; int ret; - unsigned int i, val; - ret = regmap_write(data->regmap, SX9310_REG_RESET, SX9310_SOFT_RESET); + ret = regmap_read(data->regmap, SX9310_REG_WHOAMI, &whoami); if (ret) return ret; - usleep_range(1000, 2000); /* power-up time is ~1ms. */ - - /* Clear reset interrupt state by reading SX9310_REG_IRQ_SRC. */ - ret = regmap_read(data->regmap, SX9310_REG_IRQ_SRC, &val); - if (ret) - return ret; - - /* Program some sane defaults. */ - for (i = 0; i < ARRAY_SIZE(sx9310_default_regs); i++) { - initval = sx9310_get_default_reg(&indio_dev->dev, i, &tmp); - ret = regmap_write(data->regmap, initval->reg, initval->def); - if (ret) - return ret; - } - - return sx9310_init_compensation(indio_dev); -} - -static int sx9310_set_indio_dev_name(struct device *dev, - struct iio_dev *indio_dev, - unsigned int whoami) -{ - unsigned int long ddata; - ddata = (uintptr_t)device_get_match_data(dev); - if (ddata != whoami) { - dev_err(dev, "WHOAMI does not match device data: %u\n", whoami); - return -ENODEV; - } + if (ddata != whoami) + return -EINVAL; switch (whoami) { case SX9310_WHOAMI_VALUE: @@ -1355,115 +927,52 @@ static int sx9310_set_indio_dev_name(struct device *dev, indio_dev->name = "sx9311"; break; default: - dev_err(dev, "unexpected WHOAMI response: %u\n", whoami); return -ENODEV; } return 0; } -static void sx9310_regulator_disable(void *_data) -{ - struct sx9310_data *data = _data; +static const struct sx_common_chip_info sx9310_chip_info = { + .reg_stat = SX9310_REG_STAT0, + .reg_irq_msk = SX9310_REG_IRQ_MSK, + .reg_enable_chan = SX9310_REG_PROX_CTRL0, + .reg_reset = SX9310_REG_RESET, + + .mask_enable_chan = SX9310_REG_STAT1_COMPSTAT_MASK, + .irq_msk_offset = 3, + .num_channels = SX9310_NUM_CHANNELS, + .num_default_regs = ARRAY_SIZE(sx9310_default_regs), + + .ops = { + .read_prox_data = sx9310_read_prox_data, + .check_whoami = sx9310_check_whoami, + .init_compensation = sx9310_init_compensation, + .wait_for_sample = sx9310_wait_for_sample, + .get_default_reg = sx9310_get_default_reg, + }, - regulator_bulk_disable(ARRAY_SIZE(data->supplies), data->supplies); -} + .iio_channels = sx9310_channels, + .num_iio_channels = ARRAY_SIZE(sx9310_channels), + .iio_info = { + .read_raw = sx9310_read_raw, + .read_avail = sx9310_read_avail, + .read_event_value = sx9310_read_event_val, + .write_event_value = sx9310_write_event_val, + .write_raw = sx9310_write_raw, + .read_event_config = sx_common_read_event_config, + .write_event_config = sx_common_write_event_config, + }, +}; static int sx9310_probe(struct i2c_client *client) { - int ret; - struct device *dev = &client->dev; - struct iio_dev *indio_dev; - struct sx9310_data *data; - - indio_dev = devm_iio_device_alloc(dev, sizeof(*data)); - if (!indio_dev) - return -ENOMEM; - - data = iio_priv(indio_dev); - data->client = client; - data->supplies[0].supply = "vdd"; - data->supplies[1].supply = "svdd"; - mutex_init(&data->mutex); - init_completion(&data->completion); - - data->regmap = devm_regmap_init_i2c(client, &sx9310_regmap_config); - if (IS_ERR(data->regmap)) - return PTR_ERR(data->regmap); - - ret = devm_regulator_bulk_get(dev, ARRAY_SIZE(data->supplies), - data->supplies); - if (ret) - return ret; - - ret = regulator_bulk_enable(ARRAY_SIZE(data->supplies), data->supplies); - if (ret) - return ret; - /* Must wait for Tpor time after initial power up */ - usleep_range(1000, 1100); - - ret = devm_add_action_or_reset(dev, sx9310_regulator_disable, data); - if (ret) - return ret; - - ret = regmap_read(data->regmap, SX9310_REG_WHOAMI, &data->whoami); - if (ret) { - dev_err(dev, "error in reading WHOAMI register: %d", ret); - return ret; - } - - ret = sx9310_set_indio_dev_name(dev, indio_dev, data->whoami); - if (ret) - return ret; - - ACPI_COMPANION_SET(&indio_dev->dev, ACPI_COMPANION(dev)); - indio_dev->channels = sx9310_channels; - indio_dev->num_channels = ARRAY_SIZE(sx9310_channels); - indio_dev->info = &sx9310_info; - indio_dev->modes = INDIO_DIRECT_MODE; - i2c_set_clientdata(client, indio_dev); - - ret = sx9310_init_device(indio_dev); - if (ret) - return ret; - - if (client->irq) { - ret = devm_request_threaded_irq(dev, client->irq, - sx9310_irq_handler, - sx9310_irq_thread_handler, - IRQF_ONESHOT, - "sx9310_event", indio_dev); - if (ret) - return ret; - - data->trig = devm_iio_trigger_alloc(dev, "%s-dev%d", - indio_dev->name, - iio_device_id(indio_dev)); - if (!data->trig) - return -ENOMEM; - - data->trig->ops = &sx9310_trigger_ops; - iio_trigger_set_drvdata(data->trig, indio_dev); - - ret = devm_iio_trigger_register(dev, data->trig); - if (ret) - return ret; - } - - ret = devm_iio_triggered_buffer_setup(dev, indio_dev, - iio_pollfunc_store_time, - sx9310_trigger_handler, - &sx9310_buffer_setup_ops); - if (ret) - return ret; - - return devm_iio_device_register(dev, indio_dev); + return sx_common_probe(client, &sx9310_chip_info, &sx9310_regmap_config); } static int __maybe_unused sx9310_suspend(struct device *dev) { - struct iio_dev *indio_dev = i2c_get_clientdata(to_i2c_client(dev)); - struct sx9310_data *data = iio_priv(indio_dev); + struct sx_common_data *data = iio_priv(dev_get_drvdata(dev)); u8 ctrl0; int ret; @@ -1471,11 +980,11 @@ static int __maybe_unused sx9310_suspend(struct device *dev) mutex_lock(&data->mutex); ret = regmap_read(data->regmap, SX9310_REG_PROX_CTRL0, - &data->suspend_ctrl0); + &data->suspend_ctrl); if (ret) goto out; - ctrl0 = data->suspend_ctrl0 & ~SX9310_REG_PROX_CTRL0_SENSOREN_MASK; + ctrl0 = data->suspend_ctrl & ~SX9310_REG_PROX_CTRL0_SENSOREN_MASK; ret = regmap_write(data->regmap, SX9310_REG_PROX_CTRL0, ctrl0); if (ret) goto out; @@ -1489,8 +998,7 @@ static int __maybe_unused sx9310_suspend(struct device *dev) static int __maybe_unused sx9310_resume(struct device *dev) { - struct iio_dev *indio_dev = i2c_get_clientdata(to_i2c_client(dev)); - struct sx9310_data *data = iio_priv(indio_dev); + struct sx_common_data *data = iio_priv(dev_get_drvdata(dev)); int ret; mutex_lock(&data->mutex); @@ -1499,7 +1007,7 @@ static int __maybe_unused sx9310_resume(struct device *dev) goto out; ret = regmap_write(data->regmap, SX9310_REG_PROX_CTRL0, - data->suspend_ctrl0); + data->suspend_ctrl); out: mutex_unlock(&data->mutex); diff --git a/drivers/iio/proximity/sx_common.c b/drivers/iio/proximity/sx_common.c new file mode 100644 index 00000000000000..281196d5081009 --- /dev/null +++ b/drivers/iio/proximity/sx_common.c @@ -0,0 +1,576 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Copyright 2021 Google LLC. + * + * Common part of most Semtech SAR sensor. + */ + +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include + +#include +#include +#include +#include +#include +#include + +#include "sx_common.h" + +/* All Semtech SAR sensor have IRQ bit in same order. */ +#define SX_COMMON_CONVDONE_IRQ BIT(0) +#define SX_COMMON_FAR_IRQ BIT(2) +#define SX_COMMON_CLOSE_IRQ BIT(3) + +const struct iio_event_spec sx_common_events[3] = { + { + .type = IIO_EV_TYPE_THRESH, + .dir = IIO_EV_DIR_RISING, + .mask_shared_by_all = BIT(IIO_EV_INFO_PERIOD), + }, + { + .type = IIO_EV_TYPE_THRESH, + .dir = IIO_EV_DIR_FALLING, + .mask_shared_by_all = BIT(IIO_EV_INFO_PERIOD), + }, + { + .type = IIO_EV_TYPE_THRESH, + .dir = IIO_EV_DIR_EITHER, + .mask_separate = BIT(IIO_EV_INFO_ENABLE) | + BIT(IIO_EV_INFO_HYSTERESIS) | + BIT(IIO_EV_INFO_VALUE), + }, +}; +EXPORT_SYMBOL_GPL(sx_common_events); + +static irqreturn_t sx_common_irq_handler(int irq, void *private) +{ + struct iio_dev *indio_dev = private; + struct sx_common_data *data = iio_priv(indio_dev); + + if (data->trigger_enabled) + iio_trigger_poll(data->trig); + + /* + * Even if no event is enabled, we need to wake the thread to clear the + * interrupt state by reading SX_COMMON_REG_IRQ_SRC. + * It is not possible to do that here because regmap_read takes a mutex. + */ + return IRQ_WAKE_THREAD; +} + +static void sx_common_push_events(struct iio_dev *indio_dev) +{ + int ret; + unsigned int val, chan; + struct sx_common_data *data = iio_priv(indio_dev); + s64 timestamp = iio_get_time_ns(indio_dev); + unsigned long prox_changed; + + /* Read proximity state on all channels */ + ret = regmap_read(data->regmap, data->chip_info->reg_stat, &val); + if (ret) { + dev_err(&data->client->dev, "i2c transfer error in irq\n"); + return; + } + + val <<= data->chip_info->stat_offset; + + /* + * Only iterate over channels with changes on proximity status that have + * events enabled. + */ + prox_changed = (data->chan_prox_stat ^ val) & data->chan_event; + + for_each_set_bit(chan, &prox_changed, data->chip_info->num_channels) { + int dir; + u64 ev; + + dir = (val & BIT(chan)) ? IIO_EV_DIR_FALLING : IIO_EV_DIR_RISING; + ev = IIO_UNMOD_EVENT_CODE(IIO_PROXIMITY, chan, + IIO_EV_TYPE_THRESH, dir); + + iio_push_event(indio_dev, ev, timestamp); + } + data->chan_prox_stat = val; +} + +static int sx_common_enable_irq(struct sx_common_data *data, unsigned int irq) +{ + if (!data->client->irq) + return 0; + return regmap_update_bits(data->regmap, data->chip_info->reg_irq_msk, + irq << data->chip_info->irq_msk_offset, + irq << data->chip_info->irq_msk_offset); +} + +static int sx_common_disable_irq(struct sx_common_data *data, unsigned int irq) +{ + if (!data->client->irq) + return 0; + return regmap_update_bits(data->regmap, data->chip_info->reg_irq_msk, + irq << data->chip_info->irq_msk_offset, 0); +} + +static int sx_common_update_chan_en(struct sx_common_data *data, + unsigned long chan_read, + unsigned long chan_event) +{ + int ret; + unsigned long channels = chan_read | chan_event; + + if ((data->chan_read | data->chan_event) != channels) { + ret = regmap_update_bits(data->regmap, + data->chip_info->reg_enable_chan, + data->chip_info->mask_enable_chan, + channels); + if (ret) + return ret; + } + data->chan_read = chan_read; + data->chan_event = chan_event; + return 0; +} + +static int sx_common_get_read_channel(struct sx_common_data *data, int channel) +{ + return sx_common_update_chan_en(data, data->chan_read | BIT(channel), + data->chan_event); +} + +static int sx_common_put_read_channel(struct sx_common_data *data, int channel) +{ + return sx_common_update_chan_en(data, data->chan_read & ~BIT(channel), + data->chan_event); +} + +static int sx_common_get_event_channel(struct sx_common_data *data, int channel) +{ + return sx_common_update_chan_en(data, data->chan_read, + data->chan_event | BIT(channel)); +} + +static int sx_common_put_event_channel(struct sx_common_data *data, int channel) +{ + return sx_common_update_chan_en(data, data->chan_read, + data->chan_event & ~BIT(channel)); +} + +/** + * sx_common_read_proximity() - Read raw proximity value. + * + * @data: Internal data + * @chan: Channel to read + * @val: pointer to return read value. + * + * Request a conversion, wait for the sensor to be ready and + * return the raw proximity value. + */ +int sx_common_read_proximity(struct sx_common_data *data, + const struct iio_chan_spec *chan, int *val) +{ + int ret; + __be16 rawval; + + mutex_lock(&data->mutex); + + ret = sx_common_get_read_channel(data, chan->channel); + if (ret) + goto out; + + ret = sx_common_enable_irq(data, SX_COMMON_CONVDONE_IRQ); + if (ret) + goto out_put_channel; + + mutex_unlock(&data->mutex); + + if (data->client->irq) { + ret = wait_for_completion_interruptible(&data->completion); + reinit_completion(&data->completion); + } else { + ret = data->chip_info->ops.wait_for_sample(data); + } + + mutex_lock(&data->mutex); + + if (ret) + goto out_disable_irq; + + ret = data->chip_info->ops.read_prox_data(data, chan, &rawval); + if (ret) + goto out_disable_irq; + + *val = sign_extend32(be16_to_cpu(rawval), chan->scan_type.realbits - 1); + + ret = sx_common_disable_irq(data, SX_COMMON_CONVDONE_IRQ); + if (ret) + goto out_put_channel; + + ret = sx_common_put_read_channel(data, chan->channel); + if (ret) + goto out; + + mutex_unlock(&data->mutex); + + return IIO_VAL_INT; + +out_disable_irq: + sx_common_disable_irq(data, SX_COMMON_CONVDONE_IRQ); +out_put_channel: + sx_common_put_read_channel(data, chan->channel); +out: + mutex_unlock(&data->mutex); + + return ret; +} +EXPORT_SYMBOL_GPL(sx_common_read_proximity); + +/** + * sx_common_read_event_config() - Configure event setting. + * + * @indio_dev: iio device object + * @chan: Channel to read + * @type: Type of event (unused) + * @dir: Direction of event (unused) + * + * return if the given channel is used for event gathering. + */ +int sx_common_read_event_config(struct iio_dev *indio_dev, + const struct iio_chan_spec *chan, + enum iio_event_type type, + enum iio_event_direction dir) +{ + struct sx_common_data *data = iio_priv(indio_dev); + + return !!(data->chan_event & BIT(chan->channel)); +} +EXPORT_SYMBOL_GPL(sx_common_read_event_config); + +/** + * sx_common_write_event_config() - Configure event setting. + * + * @indio_dev: iio device object + * @chan: Channel to enable + * @type: Type of event (unused) + * @dir: Direction of event (unused) + * @state: State of the event. + * + * Enable/Disable event on a given channel. + */ +int sx_common_write_event_config(struct iio_dev *indio_dev, + const struct iio_chan_spec *chan, + enum iio_event_type type, + enum iio_event_direction dir, int state) +{ + struct sx_common_data *data = iio_priv(indio_dev); + unsigned int eventirq = SX_COMMON_FAR_IRQ | SX_COMMON_CLOSE_IRQ; + int ret; + + /* If the state hasn't changed, there's nothing to do. */ + if (!!(data->chan_event & BIT(chan->channel)) == state) + return 0; + + mutex_lock(&data->mutex); + if (state) { + ret = sx_common_get_event_channel(data, chan->channel); + if (ret) + goto out_unlock; + if (!(data->chan_event & ~BIT(chan->channel))) { + ret = sx_common_enable_irq(data, eventirq); + if (ret) + sx_common_put_event_channel(data, chan->channel); + } + } else { + ret = sx_common_put_event_channel(data, chan->channel); + if (ret) + goto out_unlock; + if (!data->chan_event) { + ret = sx_common_disable_irq(data, eventirq); + if (ret) + sx_common_get_event_channel(data, chan->channel); + } + } + +out_unlock: + mutex_unlock(&data->mutex); + return ret; +} +EXPORT_SYMBOL_GPL(sx_common_write_event_config); + +static int sx_common_set_trigger_state(struct iio_trigger *trig, bool state) +{ + struct iio_dev *indio_dev = iio_trigger_get_drvdata(trig); + struct sx_common_data *data = iio_priv(indio_dev); + int ret = 0; + + mutex_lock(&data->mutex); + + if (state) + ret = sx_common_enable_irq(data, SX_COMMON_CONVDONE_IRQ); + else if (!data->chan_read) + ret = sx_common_disable_irq(data, SX_COMMON_CONVDONE_IRQ); + if (ret) + goto out; + + data->trigger_enabled = state; + +out: + mutex_unlock(&data->mutex); + + return ret; +} + +static const struct iio_trigger_ops sx_common_trigger_ops = { + .set_trigger_state = sx_common_set_trigger_state, +}; + +static irqreturn_t sx_common_irq_thread_handler(int irq, void *private) +{ + struct iio_dev *indio_dev = private; + struct sx_common_data *data = iio_priv(indio_dev); + int ret; + unsigned int val; + + mutex_lock(&data->mutex); + + ret = regmap_read(data->regmap, SX_COMMON_REG_IRQ_SRC, &val); + if (ret) { + dev_err(&data->client->dev, "i2c transfer error in irq\n"); + goto out; + } + + if (val & ((SX_COMMON_FAR_IRQ | SX_COMMON_CLOSE_IRQ) << data->chip_info->irq_msk_offset)) + sx_common_push_events(indio_dev); + + if (val & (SX_COMMON_CONVDONE_IRQ << data->chip_info->irq_msk_offset)) + complete(&data->completion); + +out: + mutex_unlock(&data->mutex); + + return IRQ_HANDLED; +} + +static irqreturn_t sx_common_trigger_handler(int irq, void *private) +{ + struct iio_poll_func *pf = private; + struct iio_dev *indio_dev = pf->indio_dev; + struct sx_common_data *data = iio_priv(indio_dev); + __be16 val; + int bit, ret, i = 0; + + mutex_lock(&data->mutex); + + for_each_set_bit(bit, indio_dev->active_scan_mask, + indio_dev->masklength) { + ret = data->chip_info->ops.read_prox_data(data, + &indio_dev->channels[bit], + &val); + if (ret) + goto out; + + data->buffer.channels[i++] = val; + } + + iio_push_to_buffers_with_timestamp(indio_dev, &data->buffer, + pf->timestamp); + +out: + mutex_unlock(&data->mutex); + + iio_trigger_notify_done(indio_dev->trig); + + return IRQ_HANDLED; +} + +static int sx_common_buffer_preenable(struct iio_dev *indio_dev) +{ + struct sx_common_data *data = iio_priv(indio_dev); + unsigned long channels = 0; + int bit, ret; + + mutex_lock(&data->mutex); + for_each_set_bit(bit, indio_dev->active_scan_mask, + indio_dev->masklength) + __set_bit(indio_dev->channels[bit].channel, &channels); + + ret = sx_common_update_chan_en(data, channels, data->chan_event); + mutex_unlock(&data->mutex); + return ret; +} + +static int sx_common_buffer_postdisable(struct iio_dev *indio_dev) +{ + struct sx_common_data *data = iio_priv(indio_dev); + int ret; + + mutex_lock(&data->mutex); + ret = sx_common_update_chan_en(data, 0, data->chan_event); + mutex_unlock(&data->mutex); + return ret; +} + +static const struct iio_buffer_setup_ops sx_common_buffer_setup_ops = { + .preenable = sx_common_buffer_preenable, + .postdisable = sx_common_buffer_postdisable, +}; + +static void sx_common_regulator_disable(void *_data) +{ + struct sx_common_data *data = _data; + + regulator_bulk_disable(ARRAY_SIZE(data->supplies), data->supplies); +} + +#define SX_COMMON_SOFT_RESET 0xde + +static int sx_common_init_device(struct iio_dev *indio_dev) +{ + struct sx_common_data *data = iio_priv(indio_dev); + struct sx_common_reg_default tmp; + const struct sx_common_reg_default *initval; + int ret; + unsigned int i, val; + + ret = regmap_write(data->regmap, data->chip_info->reg_reset, + SX_COMMON_SOFT_RESET); + if (ret) + return ret; + + usleep_range(1000, 2000); /* power-up time is ~1ms. */ + + /* Clear reset interrupt state by reading SX_COMMON_REG_IRQ_SRC. */ + ret = regmap_read(data->regmap, SX_COMMON_REG_IRQ_SRC, &val); + if (ret) + return ret; + + /* Program defaults from constant or BIOS. */ + for (i = 0; i < data->chip_info->num_default_regs; i++) { + initval = data->chip_info->ops.get_default_reg(&indio_dev->dev, + i, &tmp); + ret = regmap_write(data->regmap, initval->reg, initval->def); + if (ret) + return ret; + } + + return data->chip_info->ops.init_compensation(indio_dev); +} + +/** + * sx_common_probe() - Common setup for Semtech SAR sensor + * + * @client: I2C client object + * @chip_info: Semtech sensor chip information. + * @regmap_config: Sensor registers map configuration. + */ +int sx_common_probe(struct i2c_client *client, + const struct sx_common_chip_info *chip_info, + const struct regmap_config *regmap_config) +{ + struct device *dev = &client->dev; + struct iio_dev *indio_dev; + struct sx_common_data *data; + int ret; + + indio_dev = devm_iio_device_alloc(dev, sizeof(*data)); + if (!indio_dev) + return -ENOMEM; + + data = iio_priv(indio_dev); + + data->chip_info = chip_info; + data->client = client; + data->supplies[0].supply = "vdd"; + data->supplies[1].supply = "svdd"; + mutex_init(&data->mutex); + init_completion(&data->completion); + + data->regmap = devm_regmap_init_i2c(client, regmap_config); + if (IS_ERR(data->regmap)) + return dev_err_probe(dev, PTR_ERR(data->regmap), + "Could init register map\n"); + + ret = devm_regulator_bulk_get(dev, ARRAY_SIZE(data->supplies), + data->supplies); + if (ret) + return dev_err_probe(dev, ret, "Unable to get regulators\n"); + + ret = regulator_bulk_enable(ARRAY_SIZE(data->supplies), data->supplies); + if (ret) + return dev_err_probe(dev, ret, "Unable to enable regulators\n"); + + /* Must wait for Tpor time after initial power up */ + usleep_range(1000, 1100); + + ret = devm_add_action_or_reset(dev, sx_common_regulator_disable, data); + if (ret) + return dev_err_probe(dev, ret, + "Unable to register regulators deleter\n"); + + ret = data->chip_info->ops.check_whoami(dev, indio_dev); + if (ret) + return dev_err_probe(dev, ret, "error reading WHOAMI\n"); + + ACPI_COMPANION_SET(&indio_dev->dev, ACPI_COMPANION(dev)); + indio_dev->modes = INDIO_DIRECT_MODE; + + indio_dev->channels = data->chip_info->iio_channels; + indio_dev->num_channels = data->chip_info->num_iio_channels; + indio_dev->info = &data->chip_info->iio_info; + + i2c_set_clientdata(client, indio_dev); + + ret = sx_common_init_device(indio_dev); + if (ret) + return dev_err_probe(dev, ret, "Unable to initialize sensor\n"); + + if (client->irq) { + ret = devm_request_threaded_irq(dev, client->irq, + sx_common_irq_handler, + sx_common_irq_thread_handler, + IRQF_ONESHOT, + "sx_event", indio_dev); + if (ret) + return dev_err_probe(dev, ret, "No IRQ\n"); + + data->trig = devm_iio_trigger_alloc(dev, "%s-dev%d", + indio_dev->name, + iio_device_id(indio_dev)); + if (!data->trig) + return -ENOMEM; + + data->trig->ops = &sx_common_trigger_ops; + iio_trigger_set_drvdata(data->trig, indio_dev); + + ret = devm_iio_trigger_register(dev, data->trig); + if (ret) + return ret; + } + + ret = devm_iio_triggered_buffer_setup(dev, indio_dev, + iio_pollfunc_store_time, + sx_common_trigger_handler, + &sx_common_buffer_setup_ops); + if (ret) + return ret; + + return devm_iio_device_register(dev, indio_dev); +} +EXPORT_SYMBOL_GPL(sx_common_probe); + +MODULE_AUTHOR("Gwendal Grignou "); +MODULE_DESCRIPTION("Common functions and structures for Semtech sensor"); +MODULE_LICENSE("GPL v2"); diff --git a/drivers/iio/proximity/sx_common.h b/drivers/iio/proximity/sx_common.h new file mode 100644 index 00000000000000..045ca4940a4fec --- /dev/null +++ b/drivers/iio/proximity/sx_common.h @@ -0,0 +1,163 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +/* + * Copyright 2021 Google LLC. + * + * Code shared between most Semtech SAR sensor driver. + */ + +#ifndef IIO_SX_COMMON_H +#define IIO_SX_COMMON_H + +#include +#include +#include +#include +struct device; +struct i2c_client; +struct regmap_config; +struct sx_common_data; + +#define SX_COMMON_REG_IRQ_SRC 0x00 + +#define SX_COMMON_MAX_NUM_CHANNELS 4 +static_assert(SX_COMMON_MAX_NUM_CHANNELS < BITS_PER_LONG); + +struct sx_common_reg_default { + u8 reg; + u8 def; +}; + +/** + * struct sx_common_ops: function pointers needed by common code + * + * List functions needed by common code to gather information or configure + * the sensor. + * + * @read_prox_data: Function to read raw proximity data. + * @check_whoami: Set device name based on whoami register. + * @init_compensation: Function to set initial compensation. + * @wait_for_sample: When there are no physical IRQ, function to wait for a + * sample to be ready. + * @get_default_reg: Populate the initial value for a given register. + */ +struct sx_common_ops { + int (*read_prox_data)(struct sx_common_data *data, + const struct iio_chan_spec *chan, __be16 *val); + int (*check_whoami)(struct device *dev, struct iio_dev *indio_dev); + int (*init_compensation)(struct iio_dev *indio_dev); + int (*wait_for_sample)(struct sx_common_data *data); + const struct sx_common_reg_default * + (*get_default_reg)(struct device *dev, int idx, + struct sx_common_reg_default *reg_def); +}; + +/** + * struct sx_common_chip_info: Semtech Sensor private chip information + * + * @reg_stat: Main status register address. + * @reg_irq_msk: IRQ mask register address. + * @reg_enable_chan: Address to enable/disable channels/phases. + * @reg_reset: Reset register address. + * + * @mask_enable_chan: Mask over the channels bits in the enable channel + * register. + * @stat_offset: Offset to check phase status. + * @irq_msk_offset: Offset to enable interrupt in the IRQ mask + * register. + * + * @num_channels: Number of channel/phase. + * @num_default_regs: Number of internal registers that can be configured. + * + * @ops: Private functions pointers. + * + * @iio_channels: Description of exposed iio channels. + * @num_iio_channels: Number of iio_channels. + * @iio_info: iio_info structure for this driver. + * + */ +struct sx_common_chip_info { + unsigned int reg_stat; + unsigned int reg_irq_msk; + unsigned int reg_enable_chan; + unsigned int reg_reset; + + unsigned int mask_enable_chan; + unsigned int stat_offset; + unsigned int irq_msk_offset; + unsigned int num_channels; + int num_default_regs; + + struct sx_common_ops ops; + + const struct iio_chan_spec *iio_channels; + int num_iio_channels; + struct iio_info iio_info; +}; + +/** + * struct sx_common_data: Semtech Sensor private data structure. + * + * @chip_info: Structure defining sensor internals. + * @mutex: Serialize access to registers and channel configuration. + * @num_channels: Number of channel/phase. + * @completion: completion object to wait for data acquisition. + * @client: I2C client structure. + * @trig: IIO trigger object. + * @regmap: Register map. + * + * @num_default_regs: Number of default registers to set at init. + * @supplies: Power supplies object. + * @chan_prox_stat: Last reading of the proximity status for each channel. + * We only send an event to user space when this changes. + * @trigger_enabled: True when the device trigger is enabled. + * + * @buffer: Bufffer to store raw samples. + * @suspend_ctrl: Remember enabled channels and sample rate during suspend. + * @chan_read: Bit field for each raw channel enabled. + * @chan_event: Bit field for each event enabled. + * + */ +struct sx_common_data { + const struct sx_common_chip_info *chip_info; + + struct mutex mutex; + struct completion completion; + struct i2c_client *client; + struct iio_trigger *trig; + struct regmap *regmap; + + struct regulator_bulk_data supplies[2]; + unsigned long chan_prox_stat; + bool trigger_enabled; + + /* Ensure correct alignment of timestamp when present. */ + struct { + __be16 channels[SX_COMMON_MAX_NUM_CHANNELS]; + s64 ts __aligned(8); + } buffer; + + unsigned int suspend_ctrl; + unsigned long chan_read; + unsigned long chan_event; +}; + +int sx_common_read_proximity(struct sx_common_data *data, + const struct iio_chan_spec *chan, int *val); + +int sx_common_read_event_config(struct iio_dev *indio_dev, + const struct iio_chan_spec *chan, + enum iio_event_type type, + enum iio_event_direction dir); +int sx_common_write_event_config(struct iio_dev *indio_dev, + const struct iio_chan_spec *chan, + enum iio_event_type type, + enum iio_event_direction dir, int state); + +int sx_common_probe(struct i2c_client *client, + const struct sx_common_chip_info *chip_info, + const struct regmap_config *regmap_config); + +/* 3 is the number of events defined by a single phase. */ +extern const struct iio_event_spec sx_common_events[3]; + +#endif /* IIO_SX_COMMON_H */ From patchwork Sat Dec 18 00:17:53 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Gwendal Grignou X-Patchwork-Id: 12685819 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 26573C433F5 for ; Sat, 18 Dec 2021 00:18:06 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S229916AbhLRASF (ORCPT ); Fri, 17 Dec 2021 19:18:05 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:37888 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229643AbhLRASE (ORCPT ); Fri, 17 Dec 2021 19:18:04 -0500 Received: from mail-pg1-x52a.google.com (mail-pg1-x52a.google.com [IPv6:2607:f8b0:4864:20::52a]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id C06E4C06173E for ; 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Fri, 17 Dec 2021 16:18:04 -0800 (PST) Received: from localhost ([2620:15c:202:201:2bc8:cefc:f407:829]) by smtp.gmail.com with UTF8SMTPSA id f15sm11207930pfe.171.2021.12.17.16.18.03 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Fri, 17 Dec 2021 16:18:03 -0800 (PST) From: Gwendal Grignou To: jic23@kernel.org, lars@metafoo.de, swboyd@chromium.org Cc: linux-iio@vger.kernel.org, Gwendal Grignou Subject: [PATCH v8 3/5] iio: proximity: Add SX9324 support Date: Fri, 17 Dec 2021 16:17:53 -0800 Message-Id: <20211218001755.3096807-4-gwendal@chromium.org> X-Mailer: git-send-email 2.34.1.173.g76aa8bc2d0-goog In-Reply-To: <20211218001755.3096807-1-gwendal@chromium.org> References: <20211218001755.3096807-1-gwendal@chromium.org> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-iio@vger.kernel.org Semtech SAR sensor SX9324 is an evolution of the SX9310: It has 4 phases that can be configure to capture and process data from any of 3 CS pins and provide independent detection: proximity, table proximity or body proximity. Gather antenna data: echo sx9324-dev3 > trigger/current_trigger echo 1 > scan_elements/in_proximity0_en echo 1 > buffer/enable od -v -An --endian=big -t d2 -w2 /dev/iio\:device3 (at 10Hz, the default). Trigger events: Setting: thresh_falling_period: 2 (events) thresh_rising_period: 2 (events) in_proximity0_thresh_either_value: 300 in_proximity0_thresh_either_hysteresis: 72 using iio_event_monitor /dev/iio\:deviceX, approaching my hand to the antenna pad, I see: ... Event: time: 1634763907532035297, type: proximity, channel: 0, evtype: thresh, direction: falling Event: time: 1634763910138104640, type: proximity, channel: 0, evtype: thresh, direction: rising ... Signed-off-by: Gwendal Grignou Reviewed-by: Stephen Boyd --- Changes in v8: - Fix mismatch between documentation and code (setting vs setup) - Use dev_get_drvdata to access iio device structure. No changes in v7 Changes in v6: - Drop of_match_ptr and ACPI_PTR protections. - Fix unused variable warning. Changes in v5: - Fix includes with iwyu. Changes in v4: - Remove SX9324_DRIVER_NAME define - Drop comma after sentinel - Handle negative values when setting parameters. - Simpliy whoami function. Changes in v3: - Fix constant names - Disable IRQ at suspend. - Concatenate 2 lines. Changes in v2: - Use new interface with sx_common. - Document phase configuration parameter. - Define phase configuration parameter in channel. - Only Add needed changes in Kconfig and Makefile. - Use read_avail to define available frequencies .../ABI/testing/sysfs-bus-iio-sx9324 | 28 + drivers/iio/proximity/Kconfig | 14 + drivers/iio/proximity/Makefile | 1 + drivers/iio/proximity/sx9324.c | 910 ++++++++++++++++++ 4 files changed, 953 insertions(+) create mode 100644 Documentation/ABI/testing/sysfs-bus-iio-sx9324 create mode 100644 drivers/iio/proximity/sx9324.c diff --git a/Documentation/ABI/testing/sysfs-bus-iio-sx9324 b/Documentation/ABI/testing/sysfs-bus-iio-sx9324 new file mode 100644 index 00000000000000..632e3321f5a3df --- /dev/null +++ b/Documentation/ABI/testing/sysfs-bus-iio-sx9324 @@ -0,0 +1,28 @@ +What: /sys/bus/iio/devices/iio:deviceX/in_proximity_setup +Date: November 2021 +KernelVersion: 5.17 +Contact: Gwendal Grignou +Description: + SX9324 has 3 inputs, CS0, CS1 and CS2. Hardware layout + defines if the input is + + not connected (HZ), + + grounded (GD), + + connected to an antenna where it can act as a base + (DS - data shield), or measured input (MI). + + The sensor rotates measurement across 4 phases + (PH0, PH1, PH2, PH3), where the inputs are configured + and then measured. + + By default, during the first phase, [PH0], CS0 is measured, + while CS1 and CS2 are used as shields. + `cat in_proximity0_setup` returns "MI,DS,DS". + [PH1], CS1 is measured, CS0 and CS2 are shield: + `cat in_proximity1_setup` returns "DS,MI,DS". + [PH2], CS2 is measured, CS0 and CS1 are shield: + `cat in_proximity1_setup` returns "DS,DS,MI". + [PH3], CS1 and CS2 are measured (combo mode): + `cat in_proximity1_setup` returns "DS,MI,MI". + + Note, these are the chip default. Hardware layout will most + likely dictate different output. The entry is read-only. diff --git a/drivers/iio/proximity/Kconfig b/drivers/iio/proximity/Kconfig index 027712684835b9..dc66f339e5b12a 100644 --- a/drivers/iio/proximity/Kconfig +++ b/drivers/iio/proximity/Kconfig @@ -131,6 +131,20 @@ config SX9310 To compile this driver as a module, choose M here: the module will be called sx9310. +config SX9324 + tristate "SX9324 Semtech proximity sensor" + select IIO_BUFFER + select IIO_TRIGGERED_BUFFER + select REGMAP_I2C + select SX_COMMON + depends on I2C + help + Say Y here to build a driver for Semtech's SX9324 + proximity/button sensor. + + To compile this driver as a module, choose M here: the + module will be called sx9324. + config SX9500 tristate "SX9500 Semtech proximity sensor" select IIO_BUFFER diff --git a/drivers/iio/proximity/Makefile b/drivers/iio/proximity/Makefile index 2577fbce4144e5..cffe962b352718 100644 --- a/drivers/iio/proximity/Makefile +++ b/drivers/iio/proximity/Makefile @@ -14,6 +14,7 @@ obj-$(CONFIG_RFD77402) += rfd77402.o obj-$(CONFIG_SRF04) += srf04.o obj-$(CONFIG_SRF08) += srf08.o obj-$(CONFIG_SX9310) += sx9310.o +obj-$(CONFIG_SX9324) += sx9324.o obj-$(CONFIG_SX_COMMON) += sx_common.o obj-$(CONFIG_SX9500) += sx9500.o obj-$(CONFIG_VCNL3020) += vcnl3020.o diff --git a/drivers/iio/proximity/sx9324.c b/drivers/iio/proximity/sx9324.c new file mode 100644 index 00000000000000..37a7daa4bc7f9c --- /dev/null +++ b/drivers/iio/proximity/sx9324.c @@ -0,0 +1,910 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Copyright 2021 Google LLC. + * + * Driver for Semtech's SX9324 capacitive proximity/button solution. + * Based on SX9324 driver and copy of datasheet at: + * https://edit.wpgdadawant.com/uploads/news_file/program/2019/30184/tech_files/program_30184_suggest_other_file.pdf + */ + +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include + +#include + +#include "sx_common.h" + +/* Register definitions. */ +#define SX9324_REG_IRQ_SRC SX_COMMON_REG_IRQ_SRC +#define SX9324_REG_STAT0 0x01 +#define SX9324_REG_STAT1 0x02 +#define SX9324_REG_STAT2 0x03 +#define SX9324_REG_STAT2_COMPSTAT_MASK GENMASK(3, 0) +#define SX9324_REG_STAT3 0x04 +#define SX9324_REG_IRQ_MSK 0x05 +#define SX9324_CONVDONE_IRQ BIT(3) +#define SX9324_FAR_IRQ BIT(5) +#define SX9324_CLOSE_IRQ BIT(6) +#define SX9324_REG_IRQ_CFG0 0x06 +#define SX9324_REG_IRQ_CFG1 0x07 +#define SX9324_REG_IRQ_CFG1_FAILCOND 0x80 +#define SX9324_REG_IRQ_CFG2 0x08 + +#define SX9324_REG_GNRL_CTRL0 0x10 +#define SX9324_REG_GNRL_CTRL0_SCANPERIOD_MASK GENMASK(4, 0) +#define SX9324_REG_GNRL_CTRL0_SCANPERIOD_100MS 0x16 +#define SX9324_REG_GNRL_CTRL1 0x11 +#define SX9324_REG_GNRL_CTRL1_PHEN_MASK GENMASK(3, 0) +#define SX9324_REG_GNRL_CTRL1_PAUSECTRL 0x20 + +#define SX9324_REG_I2C_ADDR 0x14 +#define SX9324_REG_CLK_SPRD 0x15 + +#define SX9324_REG_AFE_CTRL0 0x20 +#define SX9324_REG_AFE_CTRL1 0x21 +#define SX9324_REG_AFE_CTRL2 0x22 +#define SX9324_REG_AFE_CTRL3 0x23 +#define SX9324_REG_AFE_CTRL4 0x24 +#define SX9324_REG_AFE_CTRL4_FREQ_83_33HZ 0x40 +#define SX9324_REG_AFE_CTRL4_RESOLUTION_MASK GENMASK(2, 0) +#define SX9324_REG_AFE_CTRL4_RES_100 0x04 +#define SX9324_REG_AFE_CTRL5 0x25 +#define SX9324_REG_AFE_CTRL6 0x26 +#define SX9324_REG_AFE_CTRL7 0x27 +#define SX9324_REG_AFE_PH0 0x28 +#define SX9324_REG_AFE_PH0_PIN_MASK(_pin) \ + GENMASK(2 * (_pin) + 1, 2 * (_pin)) + +#define SX9324_REG_AFE_PH1 0x29 +#define SX9324_REG_AFE_PH2 0x2a +#define SX9324_REG_AFE_PH3 0x2b +#define SX9324_REG_AFE_CTRL8 0x2c +#define SX9324_REG_AFE_CTRL8_RESFILTN_4KOHM 0x02 +#define SX9324_REG_AFE_CTRL9 0x2d +#define SX9324_REG_AFE_CTRL9_AGAIN_1 0x08 + +#define SX9324_REG_PROX_CTRL0 0x30 +#define SX9324_REG_PROX_CTRL0_GAIN_MASK GENMASK(5, 3) +#define SX9324_REG_PROX_CTRL0_GAIN_1 0x80 +#define SX9324_REG_PROX_CTRL0_RAWFILT_1P50 0x01 +#define SX9324_REG_PROX_CTRL1 0x31 +#define SX9324_REG_PROX_CTRL2 0x32 +#define SX9324_REG_PROX_CTRL2_AVGNEG_THRESH_16K 0x20 +#define SX9324_REG_PROX_CTRL3 0x33 +#define SX9324_REG_PROX_CTRL3_AVGDEB_2SAMPLES 0x40 +#define SX9324_REG_PROX_CTRL3_AVGPOS_THRESH_16K 0x20 +#define SX9324_REG_PROX_CTRL4 0x34 +#define SX9324_REG_PROX_CTRL4_AVGNEGFILT_MASK GENMASK(5, 3) +#define SX9324_REG_PROX_CTRL4_AVGNEG_FILT_2 0x08 +#define SX9324_REG_PROX_CTRL4_AVGPOSFILT_MASK GENMASK(2, 0) +#define SX9324_REG_PROX_CTRL3_AVGPOS_FILT_256 0x04 +#define SX9324_REG_PROX_CTRL5 0x35 +#define SX9324_REG_PROX_CTRL5_HYST_MASK GENMASK(5, 4) +#define SX9324_REG_PROX_CTRL5_CLOSE_DEBOUNCE_MASK GENMASK(3, 2) +#define SX9324_REG_PROX_CTRL5_FAR_DEBOUNCE_MASK GENMASK(1, 0) +#define SX9324_REG_PROX_CTRL6 0x36 +#define SX9324_REG_PROX_CTRL6_PROXTHRESH_32 0x08 +#define SX9324_REG_PROX_CTRL7 0x37 + +#define SX9324_REG_ADV_CTRL0 0x40 +#define SX9324_REG_ADV_CTRL1 0x41 +#define SX9324_REG_ADV_CTRL2 0x42 +#define SX9324_REG_ADV_CTRL3 0x43 +#define SX9324_REG_ADV_CTRL4 0x44 +#define SX9324_REG_ADV_CTRL5 0x45 +#define SX9324_REG_ADV_CTRL5_STARTUPSENS_MASK GENMASK(3, 2) +#define SX9324_REG_ADV_CTRL5_STARTUP_SENSOR_1 0x04 +#define SX9324_REG_ADV_CTRL5_STARTUP_METHOD_1 0x01 +#define SX9324_REG_ADV_CTRL6 0x46 +#define SX9324_REG_ADV_CTRL7 0x47 +#define SX9324_REG_ADV_CTRL8 0x48 +#define SX9324_REG_ADV_CTRL9 0x49 +#define SX9324_REG_ADV_CTRL10 0x4a +#define SX9324_REG_ADV_CTRL11 0x4b +#define SX9324_REG_ADV_CTRL12 0x4c +#define SX9324_REG_ADV_CTRL13 0x4d +#define SX9324_REG_ADV_CTRL14 0x4e +#define SX9324_REG_ADV_CTRL15 0x4f +#define SX9324_REG_ADV_CTRL16 0x50 +#define SX9324_REG_ADV_CTRL17 0x51 +#define SX9324_REG_ADV_CTRL18 0x52 +#define SX9324_REG_ADV_CTRL19 0x53 +#define SX9324_REG_ADV_CTRL20 0x54 +#define SX9324_REG_ADV_CTRL19_HIGHT_FAILURE_THRESH_SATURATION 0xf0 + +#define SX9324_REG_PHASE_SEL 0x60 + +#define SX9324_REG_USEFUL_MSB 0x61 +#define SX9324_REG_USEFUL_LSB 0x62 + +#define SX9324_REG_AVG_MSB 0x63 +#define SX9324_REG_AVG_LSB 0x64 + +#define SX9324_REG_DIFF_MSB 0x65 +#define SX9324_REG_DIFF_LSB 0x66 + +#define SX9324_REG_OFFSET_MSB 0x67 +#define SX9324_REG_OFFSET_LSB 0x68 + +#define SX9324_REG_SAR_MSB 0x69 +#define SX9324_REG_SAR_LSB 0x6a + +#define SX9324_REG_RESET 0x9f +/* Write this to REG_RESET to do a soft reset. */ +#define SX9324_SOFT_RESET 0xde + +#define SX9324_REG_WHOAMI 0xfa +#define SX9324_WHOAMI_VALUE 0x23 + +#define SX9324_REG_REVISION 0xfe + +/* 4 channels, as defined in STAT0: PH0, PH1, PH2 and PH3. */ +#define SX9324_NUM_CHANNELS 4 +/* 3 CS pins: CS0, CS1, CS2. */ +#define SX9324_NUM_PINS 3 + +static const char * const sx9324_cs_pin_usage[] = { "HZ", "MI", "DS", "GD" }; + +static ssize_t sx9324_phase_configuration_show(struct iio_dev *indio_dev, + uintptr_t private, + const struct iio_chan_spec *chan, + char *buf) +{ + struct sx_common_data *data = iio_priv(indio_dev); + unsigned int val; + int i, ret, pin_idx; + size_t len = 0; + + ret = regmap_read(data->regmap, SX9324_REG_AFE_PH0 + chan->channel, &val); + if (ret < 0) + return ret; + + for (i = 0; i < SX9324_NUM_PINS; i++) { + pin_idx = (val & SX9324_REG_AFE_PH0_PIN_MASK(i)) >> (2 * i); + len += scnprintf(buf + len, PAGE_SIZE - len, "%s,", + sx9324_cs_pin_usage[pin_idx]); + } + buf[len - 1] = '\n'; + return len; +} + +static const struct iio_chan_spec_ext_info sx9324_channel_ext_info[] = { + { + .name = "setup", + .shared = IIO_SEPARATE, + .read = sx9324_phase_configuration_show, + }, + {} +}; + +#define SX9324_CHANNEL(idx) \ +{ \ + .type = IIO_PROXIMITY, \ + .info_mask_separate = BIT(IIO_CHAN_INFO_RAW) | \ + BIT(IIO_CHAN_INFO_HARDWAREGAIN), \ + .info_mask_shared_by_all = BIT(IIO_CHAN_INFO_SAMP_FREQ), \ + .info_mask_separate_available = \ + BIT(IIO_CHAN_INFO_HARDWAREGAIN), \ + .info_mask_shared_by_all_available = \ + BIT(IIO_CHAN_INFO_SAMP_FREQ), \ + .indexed = 1, \ + .channel = idx, \ + .address = SX9324_REG_DIFF_MSB, \ + .event_spec = sx_common_events, \ + .num_event_specs = ARRAY_SIZE(sx_common_events), \ + .scan_index = idx, \ + .scan_type = { \ + .sign = 's', \ + .realbits = 12, \ + .storagebits = 16, \ + .endianness = IIO_BE, \ + }, \ + .ext_info = sx9324_channel_ext_info, \ +} + +static const struct iio_chan_spec sx9324_channels[] = { + SX9324_CHANNEL(0), /* Phase 0 */ + SX9324_CHANNEL(1), /* Phase 1 */ + SX9324_CHANNEL(2), /* Phase 2 */ + SX9324_CHANNEL(3), /* Phase 3 */ + IIO_CHAN_SOFT_TIMESTAMP(4), +}; + +/* + * Each entry contains the integer part (val) and the fractional part, in micro + * seconds. It conforms to the IIO output IIO_VAL_INT_PLUS_MICRO. + */ +static const struct { + int val; + int val2; +} sx9324_samp_freq_table[] = { + {1000, 0}, /* 00000: Min (no idle time) */ + {500, 0}, /* 00001: 2 ms */ + {250, 0}, /* 00010: 4 ms */ + {166, 666666}, /* 00011: 6 ms */ + {125, 0}, /* 00100: 8 ms */ + {100, 0}, /* 00101: 10 ms */ + {71, 428571}, /* 00110: 14 ms */ + {55, 555556}, /* 00111: 18 ms */ + {45, 454545}, /* 01000: 22 ms */ + {38, 461538}, /* 01001: 26 ms */ + {33, 333333}, /* 01010: 30 ms */ + {29, 411765}, /* 01011: 34 ms */ + {26, 315789}, /* 01100: 38 ms */ + {23, 809524}, /* 01101: 42 ms */ + {21, 739130}, /* 01110: 46 ms */ + {20, 0}, /* 01111: 50 ms */ + {17, 857143}, /* 10000: 56 ms */ + {16, 129032}, /* 10001: 62 ms */ + {14, 705882}, /* 10010: 68 ms */ + {13, 513514}, /* 10011: 74 ms */ + {12, 500000}, /* 10100: 80 ms */ + {11, 111111}, /* 10101: 90 ms */ + {10, 0}, /* 10110: 100 ms (Typ.) */ + {5, 0}, /* 10111: 200 ms */ + {3, 333333}, /* 11000: 300 ms */ + {2, 500000}, /* 11001: 400 ms */ + {1, 666667}, /* 11010: 600 ms */ + {1, 250000}, /* 11011: 800 ms */ + {1, 0}, /* 11100: 1 s */ + {0, 500000}, /* 11101: 2 s */ + {0, 333333}, /* 11110: 3 s */ + {0, 250000}, /* 11111: 4 s */ +}; + +static const unsigned int sx9324_scan_period_table[] = { + 2, 15, 30, 45, 60, 90, 120, 200, + 400, 600, 800, 1000, 2000, 3000, 4000, 5000, +}; + +static const struct regmap_range sx9324_writable_reg_ranges[] = { + /* + * To set COMPSTAT for compensation, even if datasheet says register is + * RO. + */ + regmap_reg_range(SX9324_REG_STAT2, SX9324_REG_STAT2), + regmap_reg_range(SX9324_REG_IRQ_MSK, SX9324_REG_IRQ_CFG2), + regmap_reg_range(SX9324_REG_GNRL_CTRL0, SX9324_REG_GNRL_CTRL1), + /* Leave i2c and clock spreading as unavailable */ + regmap_reg_range(SX9324_REG_AFE_CTRL0, SX9324_REG_AFE_CTRL9), + regmap_reg_range(SX9324_REG_PROX_CTRL0, SX9324_REG_PROX_CTRL7), + regmap_reg_range(SX9324_REG_ADV_CTRL0, SX9324_REG_ADV_CTRL20), + regmap_reg_range(SX9324_REG_PHASE_SEL, SX9324_REG_PHASE_SEL), + regmap_reg_range(SX9324_REG_OFFSET_MSB, SX9324_REG_OFFSET_LSB), + regmap_reg_range(SX9324_REG_RESET, SX9324_REG_RESET), +}; + +static const struct regmap_access_table sx9324_writeable_regs = { + .yes_ranges = sx9324_writable_reg_ranges, + .n_yes_ranges = ARRAY_SIZE(sx9324_writable_reg_ranges), +}; + +/* + * All allocated registers are readable, so we just list unallocated + * ones. + */ +static const struct regmap_range sx9324_non_readable_reg_ranges[] = { + regmap_reg_range(SX9324_REG_IRQ_CFG2 + 1, SX9324_REG_GNRL_CTRL0 - 1), + regmap_reg_range(SX9324_REG_GNRL_CTRL1 + 1, SX9324_REG_AFE_CTRL0 - 1), + regmap_reg_range(SX9324_REG_AFE_CTRL9 + 1, SX9324_REG_PROX_CTRL0 - 1), + regmap_reg_range(SX9324_REG_PROX_CTRL7 + 1, SX9324_REG_ADV_CTRL0 - 1), + regmap_reg_range(SX9324_REG_ADV_CTRL20 + 1, SX9324_REG_PHASE_SEL - 1), + regmap_reg_range(SX9324_REG_SAR_LSB + 1, SX9324_REG_RESET - 1), + regmap_reg_range(SX9324_REG_RESET + 1, SX9324_REG_WHOAMI - 1), + regmap_reg_range(SX9324_REG_WHOAMI + 1, SX9324_REG_REVISION - 1), +}; + +static const struct regmap_access_table sx9324_readable_regs = { + .no_ranges = sx9324_non_readable_reg_ranges, + .n_no_ranges = ARRAY_SIZE(sx9324_non_readable_reg_ranges), +}; + +static const struct regmap_range sx9324_volatile_reg_ranges[] = { + regmap_reg_range(SX9324_REG_IRQ_SRC, SX9324_REG_STAT3), + regmap_reg_range(SX9324_REG_USEFUL_MSB, SX9324_REG_DIFF_LSB), + regmap_reg_range(SX9324_REG_SAR_MSB, SX9324_REG_SAR_LSB), + regmap_reg_range(SX9324_REG_WHOAMI, SX9324_REG_WHOAMI), + regmap_reg_range(SX9324_REG_REVISION, SX9324_REG_REVISION), +}; + +static const struct regmap_access_table sx9324_volatile_regs = { + .yes_ranges = sx9324_volatile_reg_ranges, + .n_yes_ranges = ARRAY_SIZE(sx9324_volatile_reg_ranges), +}; + +static const struct regmap_config sx9324_regmap_config = { + .reg_bits = 8, + .val_bits = 8, + + .max_register = SX9324_REG_REVISION, + .cache_type = REGCACHE_RBTREE, + + .wr_table = &sx9324_writeable_regs, + .rd_table = &sx9324_readable_regs, + .volatile_table = &sx9324_volatile_regs, +}; + +static int sx9324_read_prox_data(struct sx_common_data *data, + const struct iio_chan_spec *chan, + __be16 *val) +{ + int ret; + + ret = regmap_write(data->regmap, SX9324_REG_PHASE_SEL, chan->channel); + if (ret < 0) + return ret; + + return regmap_bulk_read(data->regmap, chan->address, val, sizeof(*val)); +} + +/* + * If we have no interrupt support, we have to wait for a scan period + * after enabling a channel to get a result. + */ +static int sx9324_wait_for_sample(struct sx_common_data *data) +{ + int ret; + unsigned int val; + + ret = regmap_read(data->regmap, SX9324_REG_GNRL_CTRL0, &val); + if (ret < 0) + return ret; + val = FIELD_GET(SX9324_REG_GNRL_CTRL0_SCANPERIOD_MASK, val); + + msleep(sx9324_scan_period_table[val]); + + return 0; +} + +static int sx9324_read_gain(struct sx_common_data *data, + const struct iio_chan_spec *chan, int *val) +{ + unsigned int reg, regval; + int ret; + + reg = SX9324_REG_PROX_CTRL0 + chan->channel / 2; + ret = regmap_read(data->regmap, reg, ®val); + if (ret) + return ret; + + *val = 1 << FIELD_GET(SX9324_REG_PROX_CTRL0_GAIN_MASK, regval); + + return IIO_VAL_INT; +} + +static int sx9324_read_samp_freq(struct sx_common_data *data, + int *val, int *val2) +{ + int ret; + unsigned int regval; + + ret = regmap_read(data->regmap, SX9324_REG_GNRL_CTRL0, ®val); + if (ret) + return ret; + + regval = FIELD_GET(SX9324_REG_GNRL_CTRL0_SCANPERIOD_MASK, regval); + *val = sx9324_samp_freq_table[regval].val; + *val2 = sx9324_samp_freq_table[regval].val2; + + return IIO_VAL_INT_PLUS_MICRO; +} + +static int sx9324_read_raw(struct iio_dev *indio_dev, + const struct iio_chan_spec *chan, + int *val, int *val2, long mask) +{ + struct sx_common_data *data = iio_priv(indio_dev); + int ret; + + switch (mask) { + case IIO_CHAN_INFO_RAW: + ret = iio_device_claim_direct_mode(indio_dev); + if (ret) + return ret; + + ret = sx_common_read_proximity(data, chan, val); + iio_device_release_direct_mode(indio_dev); + return ret; + case IIO_CHAN_INFO_HARDWAREGAIN: + ret = iio_device_claim_direct_mode(indio_dev); + if (ret) + return ret; + + ret = sx9324_read_gain(data, chan, val); + iio_device_release_direct_mode(indio_dev); + return ret; + case IIO_CHAN_INFO_SAMP_FREQ: + return sx9324_read_samp_freq(data, val, val2); + default: + return -EINVAL; + } +} + +static const int sx9324_gain_vals[] = { 1, 2, 4, 8 }; + +static int sx9324_read_avail(struct iio_dev *indio_dev, + struct iio_chan_spec const *chan, + const int **vals, int *type, int *length, + long mask) +{ + if (chan->type != IIO_PROXIMITY) + return -EINVAL; + + switch (mask) { + case IIO_CHAN_INFO_HARDWAREGAIN: + *type = IIO_VAL_INT; + *length = ARRAY_SIZE(sx9324_gain_vals); + *vals = sx9324_gain_vals; + return IIO_AVAIL_LIST; + case IIO_CHAN_INFO_SAMP_FREQ: + *type = IIO_VAL_INT_PLUS_MICRO; + *length = ARRAY_SIZE(sx9324_samp_freq_table) * 2; + *vals = (int *)sx9324_samp_freq_table; + return IIO_AVAIL_LIST; + } + + return -EINVAL; +} + +static int sx9324_set_samp_freq(struct sx_common_data *data, + int val, int val2) +{ + int i, ret; + + for (i = 0; i < ARRAY_SIZE(sx9324_samp_freq_table); i++) + if (val == sx9324_samp_freq_table[i].val && + val2 == sx9324_samp_freq_table[i].val2) + break; + + if (i == ARRAY_SIZE(sx9324_samp_freq_table)) + return -EINVAL; + + mutex_lock(&data->mutex); + + ret = regmap_update_bits(data->regmap, + SX9324_REG_GNRL_CTRL0, + SX9324_REG_GNRL_CTRL0_SCANPERIOD_MASK, i); + + mutex_unlock(&data->mutex); + + return ret; +} + +static int sx9324_read_thresh(struct sx_common_data *data, + const struct iio_chan_spec *chan, int *val) +{ + unsigned int regval; + unsigned int reg; + int ret; + + /* + * TODO(gwendal): Depending on the phase function + * (proximity/table/body), retrieve the right threshold. + * For now, return the proximity threshold. + */ + reg = SX9324_REG_PROX_CTRL6 + chan->channel / 2; + ret = regmap_read(data->regmap, reg, ®val); + if (ret) + return ret; + + if (regval <= 1) + *val = regval; + else + *val = (regval * regval) / 2; + + return IIO_VAL_INT; +} + +static int sx9324_read_hysteresis(struct sx_common_data *data, + const struct iio_chan_spec *chan, int *val) +{ + unsigned int regval, pthresh; + int ret; + + ret = sx9324_read_thresh(data, chan, &pthresh); + if (ret < 0) + return ret; + + ret = regmap_read(data->regmap, SX9324_REG_PROX_CTRL5, ®val); + if (ret) + return ret; + + regval = FIELD_GET(SX9324_REG_PROX_CTRL5_HYST_MASK, regval); + if (!regval) + *val = 0; + else + *val = pthresh >> (5 - regval); + + return IIO_VAL_INT; +} + +static int sx9324_read_far_debounce(struct sx_common_data *data, int *val) +{ + unsigned int regval; + int ret; + + ret = regmap_read(data->regmap, SX9324_REG_PROX_CTRL5, ®val); + if (ret) + return ret; + + regval = FIELD_GET(SX9324_REG_PROX_CTRL5_FAR_DEBOUNCE_MASK, regval); + if (regval) + *val = 1 << regval; + else + *val = 0; + + return IIO_VAL_INT; +} + +static int sx9324_read_close_debounce(struct sx_common_data *data, int *val) +{ + unsigned int regval; + int ret; + + ret = regmap_read(data->regmap, SX9324_REG_PROX_CTRL5, ®val); + if (ret) + return ret; + + regval = FIELD_GET(SX9324_REG_PROX_CTRL5_CLOSE_DEBOUNCE_MASK, regval); + if (regval) + *val = 1 << regval; + else + *val = 0; + + return IIO_VAL_INT; +} + +static int sx9324_read_event_val(struct iio_dev *indio_dev, + const struct iio_chan_spec *chan, + enum iio_event_type type, + enum iio_event_direction dir, + enum iio_event_info info, int *val, int *val2) +{ + struct sx_common_data *data = iio_priv(indio_dev); + + if (chan->type != IIO_PROXIMITY) + return -EINVAL; + + switch (info) { + case IIO_EV_INFO_VALUE: + return sx9324_read_thresh(data, chan, val); + case IIO_EV_INFO_PERIOD: + switch (dir) { + case IIO_EV_DIR_RISING: + return sx9324_read_far_debounce(data, val); + case IIO_EV_DIR_FALLING: + return sx9324_read_close_debounce(data, val); + default: + return -EINVAL; + } + case IIO_EV_INFO_HYSTERESIS: + return sx9324_read_hysteresis(data, chan, val); + default: + return -EINVAL; + } +} + +static int sx9324_write_thresh(struct sx_common_data *data, + const struct iio_chan_spec *chan, int _val) +{ + unsigned int reg, val = _val; + int ret; + + reg = SX9324_REG_PROX_CTRL6 + chan->channel / 2; + + if (val >= 1) + val = int_sqrt(2 * val); + + if (val > 0xff) + return -EINVAL; + + mutex_lock(&data->mutex); + ret = regmap_write(data->regmap, reg, val); + mutex_unlock(&data->mutex); + + return ret; +} + +static int sx9324_write_hysteresis(struct sx_common_data *data, + const struct iio_chan_spec *chan, int _val) +{ + unsigned int hyst, val = _val; + int ret, pthresh; + + ret = sx9324_read_thresh(data, chan, &pthresh); + if (ret < 0) + return ret; + + if (val == 0) + hyst = 0; + else if (val >= pthresh >> 2) + hyst = 3; + else if (val >= pthresh >> 3) + hyst = 2; + else if (val >= pthresh >> 4) + hyst = 1; + else + return -EINVAL; + + hyst = FIELD_PREP(SX9324_REG_PROX_CTRL5_HYST_MASK, hyst); + mutex_lock(&data->mutex); + ret = regmap_update_bits(data->regmap, SX9324_REG_PROX_CTRL5, + SX9324_REG_PROX_CTRL5_HYST_MASK, hyst); + mutex_unlock(&data->mutex); + + return ret; +} + +static int sx9324_write_far_debounce(struct sx_common_data *data, int _val) +{ + unsigned int regval, val = _val; + int ret; + + if (val > 0) + val = ilog2(val); + if (!FIELD_FIT(SX9324_REG_PROX_CTRL5_FAR_DEBOUNCE_MASK, val)) + return -EINVAL; + + regval = FIELD_PREP(SX9324_REG_PROX_CTRL5_FAR_DEBOUNCE_MASK, val); + + mutex_lock(&data->mutex); + ret = regmap_update_bits(data->regmap, SX9324_REG_PROX_CTRL5, + SX9324_REG_PROX_CTRL5_FAR_DEBOUNCE_MASK, + regval); + mutex_unlock(&data->mutex); + + return ret; +} + +static int sx9324_write_close_debounce(struct sx_common_data *data, int _val) +{ + unsigned int regval, val = _val; + int ret; + + if (val > 0) + val = ilog2(val); + if (!FIELD_FIT(SX9324_REG_PROX_CTRL5_CLOSE_DEBOUNCE_MASK, val)) + return -EINVAL; + + regval = FIELD_PREP(SX9324_REG_PROX_CTRL5_CLOSE_DEBOUNCE_MASK, val); + + mutex_lock(&data->mutex); + ret = regmap_update_bits(data->regmap, SX9324_REG_PROX_CTRL5, + SX9324_REG_PROX_CTRL5_CLOSE_DEBOUNCE_MASK, + regval); + mutex_unlock(&data->mutex); + + return ret; +} + +static int sx9324_write_event_val(struct iio_dev *indio_dev, + const struct iio_chan_spec *chan, + enum iio_event_type type, + enum iio_event_direction dir, + enum iio_event_info info, int val, int val2) +{ + struct sx_common_data *data = iio_priv(indio_dev); + + if (chan->type != IIO_PROXIMITY) + return -EINVAL; + + switch (info) { + case IIO_EV_INFO_VALUE: + return sx9324_write_thresh(data, chan, val); + case IIO_EV_INFO_PERIOD: + switch (dir) { + case IIO_EV_DIR_RISING: + return sx9324_write_far_debounce(data, val); + case IIO_EV_DIR_FALLING: + return sx9324_write_close_debounce(data, val); + default: + return -EINVAL; + } + case IIO_EV_INFO_HYSTERESIS: + return sx9324_write_hysteresis(data, chan, val); + default: + return -EINVAL; + } +} + +static int sx9324_write_gain(struct sx_common_data *data, + const struct iio_chan_spec *chan, int val) +{ + unsigned int gain, reg; + int ret; + + gain = ilog2(val); + reg = SX9324_REG_PROX_CTRL0 + chan->channel / 2; + gain = FIELD_PREP(SX9324_REG_PROX_CTRL0_GAIN_MASK, gain); + + mutex_lock(&data->mutex); + ret = regmap_update_bits(data->regmap, reg, + SX9324_REG_PROX_CTRL0_GAIN_MASK, + gain); + mutex_unlock(&data->mutex); + + return ret; +} + +static int sx9324_write_raw(struct iio_dev *indio_dev, + const struct iio_chan_spec *chan, int val, int val2, + long mask) +{ + struct sx_common_data *data = iio_priv(indio_dev); + + switch (mask) { + case IIO_CHAN_INFO_SAMP_FREQ: + return sx9324_set_samp_freq(data, val, val2); + case IIO_CHAN_INFO_HARDWAREGAIN: + return sx9324_write_gain(data, chan, val); + } + + return -EINVAL; +} + +/* Activate all channels and perform an initial compensation. */ +static int sx9324_init_compensation(struct iio_dev *indio_dev) +{ + struct sx_common_data *data = iio_priv(indio_dev); + unsigned int val; + int ret; + + /* run the compensation phase on all channels */ + ret = regmap_update_bits(data->regmap, SX9324_REG_STAT2, + SX9324_REG_STAT2_COMPSTAT_MASK, + SX9324_REG_STAT2_COMPSTAT_MASK); + if (ret) + return ret; + + ret = regmap_read_poll_timeout(data->regmap, SX9324_REG_STAT2, val, + !(val & SX9324_REG_STAT2_COMPSTAT_MASK), + 20000, 2000000); + if (ret == -ETIMEDOUT) + dev_err(&data->client->dev, + "initial compensation timed out: 0x%02x\n", + val); + return ret; +} + +static int sx9324_check_whoami(struct device *dev, + struct iio_dev *indio_dev) +{ + /* + * Only one sensor for this driver. Assuming the device tree + * is correct, just set the sensor name. + */ + indio_dev->name = "sx9324"; + return 0; +} + +static const struct sx_common_chip_info sx9324_chip_info = { + .reg_stat = SX9324_REG_STAT0, + .reg_irq_msk = SX9324_REG_IRQ_MSK, + .reg_enable_chan = SX9324_REG_GNRL_CTRL1, + .reg_reset = SX9324_REG_RESET, + + .mask_enable_chan = SX9324_REG_GNRL_CTRL1_PHEN_MASK, + .irq_msk_offset = 3, + .num_channels = SX9324_NUM_CHANNELS, + + .ops = { + .read_prox_data = sx9324_read_prox_data, + .check_whoami = sx9324_check_whoami, + .init_compensation = sx9324_init_compensation, + .wait_for_sample = sx9324_wait_for_sample, + }, + + .iio_channels = sx9324_channels, + .num_iio_channels = ARRAY_SIZE(sx9324_channels), + .iio_info = { + .read_raw = sx9324_read_raw, + .read_avail = sx9324_read_avail, + .read_event_value = sx9324_read_event_val, + .write_event_value = sx9324_write_event_val, + .write_raw = sx9324_write_raw, + .read_event_config = sx_common_read_event_config, + .write_event_config = sx_common_write_event_config, + }, +}; + +static int sx9324_probe(struct i2c_client *client) +{ + return sx_common_probe(client, &sx9324_chip_info, &sx9324_regmap_config); +} + +static int __maybe_unused sx9324_suspend(struct device *dev) +{ + struct sx_common_data *data = iio_priv(dev_get_drvdata(dev)); + unsigned int regval; + int ret; + + disable_irq_nosync(data->client->irq); + + mutex_lock(&data->mutex); + ret = regmap_read(data->regmap, SX9324_REG_GNRL_CTRL1, ®val); + + data->suspend_ctrl = + FIELD_GET(SX9324_REG_GNRL_CTRL1_PHEN_MASK, regval); + + if (ret < 0) + goto out; + + /* Disable all phases, send the device to sleep. */ + ret = regmap_write(data->regmap, SX9324_REG_GNRL_CTRL1, 0); + +out: + mutex_unlock(&data->mutex); + return ret; +} + +static int __maybe_unused sx9324_resume(struct device *dev) +{ + struct sx_common_data *data = iio_priv(dev_get_drvdata(dev)); + int ret; + + mutex_lock(&data->mutex); + ret = regmap_write(data->regmap, SX9324_REG_GNRL_CTRL1, + data->suspend_ctrl | SX9324_REG_GNRL_CTRL1_PAUSECTRL); + mutex_unlock(&data->mutex); + if (ret) + return ret; + + enable_irq(data->client->irq); + return 0; +} + +static const struct dev_pm_ops sx9324_pm_ops = { + SET_SYSTEM_SLEEP_PM_OPS(sx9324_suspend, sx9324_resume) +}; + +static const struct acpi_device_id sx9324_acpi_match[] = { + { "STH9324", SX9324_WHOAMI_VALUE}, + { } +}; +MODULE_DEVICE_TABLE(acpi, sx9324_acpi_match); + +static const struct of_device_id sx9324_of_match[] = { + { .compatible = "semtech,sx9324", (void *)SX9324_WHOAMI_VALUE}, + { } +}; +MODULE_DEVICE_TABLE(of, sx9324_of_match); + +static const struct i2c_device_id sx9324_id[] = { + {"sx9324", SX9324_WHOAMI_VALUE}, + { } +}; +MODULE_DEVICE_TABLE(i2c, sx9324_id); + +static struct i2c_driver sx9324_driver = { + .driver = { + .name = "sx9324", + .acpi_match_table = sx9324_acpi_match, + .of_match_table = sx9324_of_match, + .pm = &sx9324_pm_ops, + + /* + * Lots of i2c transfers in probe + over 200 ms waiting in + * sx9324_init_compensation() mean a slow probe; prefer async + * so we don't delay boot if we're builtin to the kernel. + */ + .probe_type = PROBE_PREFER_ASYNCHRONOUS, + }, + .probe_new = sx9324_probe, + .id_table = sx9324_id, +}; +module_i2c_driver(sx9324_driver); + +MODULE_AUTHOR("Gwendal Grignou "); +MODULE_DESCRIPTION("Driver for Semtech SX9324 proximity sensor"); +MODULE_LICENSE("GPL v2"); From patchwork Sat Dec 18 00:17:54 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Gwendal Grignou X-Patchwork-Id: 12685823 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id C9678C4332F for ; Sat, 18 Dec 2021 00:18:06 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S229933AbhLRASG (ORCPT ); Fri, 17 Dec 2021 19:18:06 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:37898 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229643AbhLRASG (ORCPT ); Fri, 17 Dec 2021 19:18:06 -0500 Received: from mail-pj1-x1034.google.com (mail-pj1-x1034.google.com [IPv6:2607:f8b0:4864:20::1034]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 0EA73C06173E for ; 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Fri, 17 Dec 2021 16:18:05 -0800 (PST) Received: from localhost ([2620:15c:202:201:2bc8:cefc:f407:829]) by smtp.gmail.com with UTF8SMTPSA id lr3sm13503179pjb.34.2021.12.17.16.18.04 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Fri, 17 Dec 2021 16:18:05 -0800 (PST) From: Gwendal Grignou To: jic23@kernel.org, lars@metafoo.de, swboyd@chromium.org Cc: linux-iio@vger.kernel.org, Gwendal Grignou , Rob Herring Subject: [PATCH v8 4/5] dt-bindings: iio: Add sx9324 binding Date: Fri, 17 Dec 2021 16:17:54 -0800 Message-Id: <20211218001755.3096807-5-gwendal@chromium.org> X-Mailer: git-send-email 2.34.1.173.g76aa8bc2d0-goog In-Reply-To: <20211218001755.3096807-1-gwendal@chromium.org> References: <20211218001755.3096807-1-gwendal@chromium.org> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-iio@vger.kernel.org Similar to SX9310, add biddings to setup sx9324 hardware properties. SX9324 is a little different, introduce 4 phases to be configured in 2 pairs over 3 antennas. Signed-off-by: Gwendal Grignou Reviewed-by: Rob Herring Reviewed-by: Stephen Boyd --- No Changes in v8. Changes in v7: - Fix 2 remaining syntax error in example. Changes in v6: - Fix syntax errors in device tree binding documentation. - Run 'make dt_binding_check' to make fix errors. Changes in v5: - Use consistent field naming, prefixed with phX. Changes in v4: - Use const instead of single enum - Specify ph0-pin better - Recopy type information for phX-pin - Fix cut and paste errors. Changes in v3: - Remove duplicate information. - Use intervals instead of enum. - Fix filter description. Changes in v2: - Fix interrupt documentation wording. .../iio/proximity/semtech,sx9324.yaml | 161 ++++++++++++++++++ 1 file changed, 161 insertions(+) create mode 100644 Documentation/devicetree/bindings/iio/proximity/semtech,sx9324.yaml diff --git a/Documentation/devicetree/bindings/iio/proximity/semtech,sx9324.yaml b/Documentation/devicetree/bindings/iio/proximity/semtech,sx9324.yaml new file mode 100644 index 00000000000000..b8a6ee16854ff6 --- /dev/null +++ b/Documentation/devicetree/bindings/iio/proximity/semtech,sx9324.yaml @@ -0,0 +1,161 @@ +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause) +%YAML 1.2 +--- +$id: http://devicetree.org/schemas/iio/proximity/semtech,sx9324.yaml# +$schema: http://devicetree.org/meta-schemas/core.yaml# + +title: Semtech's SX9324 capacitive proximity sensor + +maintainers: + - Gwendal Grignou + - Daniel Campello + +description: | + Semtech's SX9324 proximity sensor. + +properties: + compatible: + const: semtech,sx9324 + + reg: + maxItems: 1 + + interrupts: + description: + Generated by device to announce preceding read request has finished + and data is available or that a close/far proximity event has happened. + maxItems: 1 + + vdd-supply: + description: Main power supply + + svdd-supply: + description: Host interface power supply + + "#io-channel-cells": + const: 1 + + semtech,ph0-pin: + $ref: /schemas/types.yaml#/definitions/uint32-array + description: | + Array of 3 entries. Index represent the id of the CS pin. + Value indicates how each CS pin is used during phase 0. + Each of the 3 pins have the following value - + 0 : unused (high impedance) + 1 : measured input + 2 : dynamic shield + 3 : grounded. + For instance, CS0 measured, CS1 shield and CS2 ground is [1, 2, 3] + items: + enum: [ 0, 1, 2, 3 ] + minItems: 3 + maxItems: 3 + + semtech,ph1-pin: + $ref: /schemas/types.yaml#/definitions/uint32-array + description: Same as ph0-pin for phase 1. + items: + enum: [ 0, 1, 2, 3 ] + minItems: 3 + maxItems: 3 + + semtech,ph2-pin: + $ref: /schemas/types.yaml#/definitions/uint32-array + description: Same as ph0-pin for phase 2. + items: + enum: [ 0, 1, 2, 3 ] + minItems: 3 + maxItems: 3 + + semtech,ph3-pin: + $ref: /schemas/types.yaml#/definitions/uint32-array + description: Same as ph0-pin for phase 3. + items: + enum: [ 0, 1, 2, 3 ] + minItems: 3 + maxItems: 3 + + + semtech,ph01-resolution: + $ref: /schemas/types.yaml#/definitions/uint32 + enum: [8, 16, 32, 64, 128, 256, 512, 1024] + description: + Capacitance measurement resolution. For phase 0 and 1. + Higher the number, higher the resolution. + default: 128 + + semtech,ph23-resolution: + $ref: /schemas/types.yaml#/definitions/uint32 + enum: [8, 16, 32, 64, 128, 256, 512, 1024] + description: + Capacitance measurement resolution. For phase 2 and 3 + default: 128 + + semtech,startup-sensor: + $ref: /schemas/types.yaml#/definitions/uint32 + enum: [0, 1, 2, 3] + default: 0 + description: | + Phase used for start-up proximity detection. + It is used when we enable a phase to remove static offset and measure + only capacitance changes introduced by the user. + + semtech,ph01-proxraw-strength: + $ref: /schemas/types.yaml#/definitions/uint32 + minimum: 0 + maximum: 7 + default: 1 + description: + PROXRAW filter strength for phase 0 and 1. A value of 0 represents off, + and other values represent 1-1/2^N. + + semtech,ph23-proxraw-strength: + $ref: /schemas/types.yaml#/definitions/uint32 + minimum: 0 + maximum: 7 + default: 1 + description: + Same as proxraw-strength01, for phase 2 and 3. + + semtech,avg-pos-strength: + $ref: /schemas/types.yaml#/definitions/uint32 + enum: [0, 16, 64, 128, 256, 512, 1024, 4294967295] + default: 16 + description: | + Average positive filter strength. A value of 0 represents off and + UINT_MAX (4294967295) represents infinite. Other values + represent 1-1/N. + +required: + - compatible + - reg + - "#io-channel-cells" + +additionalProperties: false + +examples: + - | + #include + i2c { + #address-cells = <1>; + #size-cells = <0>; + proximity@28 { + compatible = "semtech,sx9324"; + reg = <0x28>; + interrupt-parent = <&pio>; + interrupts = <5 IRQ_TYPE_LEVEL_LOW 5>; + vdd-supply = <&pp3300_a>; + svdd-supply = <&pp1800_prox>; + #io-channel-cells = <1>; + semtech,ph0-pin = <1 2 3>; + semtech,ph1-pin = <3 2 1>; + semtech,ph2-pin = <1 2 3>; + semtech,ph3-pin = <3 2 1>; + semtech,ph01-resolution = <256>; + semtech,ph23-resolution = <256>; + semtech,startup-sensor = <1>; + semtech,ph01-proxraw-strength = <2>; + semtech,ph23-proxraw-strength = <2>; + semtech,avg-pos-strength = <64>; + }; + }; From patchwork Sat Dec 18 00:17:55 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Gwendal Grignou X-Patchwork-Id: 12685821 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 3DA26C433FE for ; Sat, 18 Dec 2021 00:18:08 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S229934AbhLRASH (ORCPT ); Fri, 17 Dec 2021 19:18:07 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:37906 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229643AbhLRASH (ORCPT ); Fri, 17 Dec 2021 19:18:07 -0500 Received: from mail-pf1-x42e.google.com (mail-pf1-x42e.google.com [IPv6:2607:f8b0:4864:20::42e]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 74262C06173E for ; Fri, 17 Dec 2021 16:18:07 -0800 (PST) Received: by mail-pf1-x42e.google.com with SMTP id l6so1507005pfu.0 for ; Fri, 17 Dec 2021 16:18:07 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=chromium.org; s=google; h=from:to:cc:subject:date:message-id:in-reply-to:references :mime-version:content-transfer-encoding; bh=9duUBk5l8FZ0mnnSfLHI/G0fJBGxCiFcYTX2sUQ6YwQ=; b=FLOylARSsyDyOmzfL1R/gs1igLTYr6W1y43LEMA3m6n4YUaiZjl0OIRTyhVQbs5UHz 3ZpqKxFBDdcqgDyLEDezh4QhOn2Es2FyJ+DVVPRvkEjkuiaHIbNNAlKkIVfwcG3prrQy vV1UnMKxdzJMazMEK9DZnTL9hwH7yaxpcCzug= X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=x-gm-message-state:from:to:cc:subject:date:message-id:in-reply-to :references:mime-version:content-transfer-encoding; bh=9duUBk5l8FZ0mnnSfLHI/G0fJBGxCiFcYTX2sUQ6YwQ=; b=re+Mk3Etu3Zf1SwvfSxVEqBGY5BANeji3qzOoSxXcUxkG810CL9wUnT2siEgkcOWF/ fTLhY6BFWzPZq6stciCQA3KM4wRHXLxE6ewl+DsQSBgirBgDX0pSXQTDOBw2dP0Kl/Ar yyyKGv8zxZT4ky7tT6EpyNshoLC1ZkL5HsXBtA1X3uGs57PRnijixeMfSPCZAHOzaPgl VxcH1TPsWeNiGsnr44bVB2nrryyKWFRxUKpDUMYE93Uj1AfZbHK6GVLezN+XRVCMaxjl P9jnugdZYXUvE8Ake2zYRepc0Pw/qV1zYG3Pe2sAXo+DoBkaDdltn2CYWHCu/Nq3yiLn PV1Q== X-Gm-Message-State: AOAM531Ij4TP6Vk3eSaWD5IB3meyDrq/LGBLFv4/C5wGQAU77gRHU67W j7A6+bOOl3mJeRoKdpofSu6VvQ== X-Google-Smtp-Source: ABdhPJxAm1Ek3YSH2XXJlJzk4hQ9MT2GjR6vJ86vBZBqhncH3COlE6FuWk9rHqdhWg5y7YLFBa/CvQ== X-Received: by 2002:aa7:9ddb:0:b0:4a4:f597:a4ca with SMTP id g27-20020aa79ddb000000b004a4f597a4camr5394129pfq.57.1639786686898; Fri, 17 Dec 2021 16:18:06 -0800 (PST) Received: from localhost ([2620:15c:202:201:2bc8:cefc:f407:829]) by smtp.gmail.com with UTF8SMTPSA id t38sm10829414pfg.199.2021.12.17.16.18.06 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Fri, 17 Dec 2021 16:18:06 -0800 (PST) From: Gwendal Grignou To: jic23@kernel.org, lars@metafoo.de, swboyd@chromium.org Cc: linux-iio@vger.kernel.org, Gwendal Grignou Subject: [PATCH v8 5/5] iio: sx9324: Add dt_binding support Date: Fri, 17 Dec 2021 16:17:55 -0800 Message-Id: <20211218001755.3096807-6-gwendal@chromium.org> X-Mailer: git-send-email 2.34.1.173.g76aa8bc2d0-goog In-Reply-To: <20211218001755.3096807-1-gwendal@chromium.org> References: <20211218001755.3096807-1-gwendal@chromium.org> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-iio@vger.kernel.org Based on bindings/iio/proximity/semtech,sx9324.yaml, implement retrieving sensor hardware property and alter default values. Signed-off-by: Gwendal Grignou Reviewed-by: Stephen Boyd --- Changes in v8: - Fix spelling/comment. No changes in v7 No changes in v6. Changes in v5: - Use prefixed binding names. - Fix long lines. Changes in v4: - Fix spelling in commit title. Changes in v3: - Remove duplicate information. - Use intervals instead of enum. - Fix filter description. Changes in v2: - Fix interrupt documentation wording. drivers/iio/proximity/sx9324.c | 164 +++++++++++++++++++++++++++++++++ 1 file changed, 164 insertions(+) diff --git a/drivers/iio/proximity/sx9324.c b/drivers/iio/proximity/sx9324.c index 37a7daa4bc7f9c..bc9484a5862673 100644 --- a/drivers/iio/proximity/sx9324.c +++ b/drivers/iio/proximity/sx9324.c @@ -77,6 +77,7 @@ #define SX9324_REG_PROX_CTRL0 0x30 #define SX9324_REG_PROX_CTRL0_GAIN_MASK GENMASK(5, 3) #define SX9324_REG_PROX_CTRL0_GAIN_1 0x80 +#define SX9324_REG_PROX_CTRL0_RAWFILT_MASK GENMASK(2, 0) #define SX9324_REG_PROX_CTRL0_RAWFILT_1P50 0x01 #define SX9324_REG_PROX_CTRL1 0x31 #define SX9324_REG_PROX_CTRL2 0x32 @@ -753,6 +754,74 @@ static int sx9324_write_raw(struct iio_dev *indio_dev, return -EINVAL; } +static const struct sx_common_reg_default sx9324_default_regs[] = { + { SX9324_REG_IRQ_MSK, 0x00 }, + { SX9324_REG_IRQ_CFG0, 0x00 }, + { SX9324_REG_IRQ_CFG1, SX9324_REG_IRQ_CFG1_FAILCOND }, + { SX9324_REG_IRQ_CFG2, 0x00 }, + { SX9324_REG_GNRL_CTRL0, SX9324_REG_GNRL_CTRL0_SCANPERIOD_100MS }, + /* + * The lower 4 bits should not be set as it enable sensors measurements. + * Turning the detection on before the configuration values are set to + * good values can cause the device to return erroneous readings. + */ + { SX9324_REG_GNRL_CTRL1, SX9324_REG_GNRL_CTRL1_PAUSECTRL }, + + { SX9324_REG_AFE_CTRL0, 0x00 }, + { SX9324_REG_AFE_CTRL3, 0x00 }, + { SX9324_REG_AFE_CTRL4, SX9324_REG_AFE_CTRL4_FREQ_83_33HZ | + SX9324_REG_AFE_CTRL4_RES_100 }, + { SX9324_REG_AFE_CTRL6, 0x00 }, + { SX9324_REG_AFE_CTRL7, SX9324_REG_AFE_CTRL4_FREQ_83_33HZ | + SX9324_REG_AFE_CTRL4_RES_100 }, + + /* TODO(gwendal): PHx use chip default or all grounded? */ + { SX9324_REG_AFE_PH0, 0x29 }, + { SX9324_REG_AFE_PH1, 0x26 }, + { SX9324_REG_AFE_PH2, 0x1a }, + { SX9324_REG_AFE_PH3, 0x16 }, + + { SX9324_REG_AFE_CTRL8, SX9324_REG_AFE_CTRL8_RESFILTN_4KOHM }, + { SX9324_REG_AFE_CTRL9, SX9324_REG_AFE_CTRL9_AGAIN_1 }, + + { SX9324_REG_PROX_CTRL0, SX9324_REG_PROX_CTRL0_GAIN_1 | + SX9324_REG_PROX_CTRL0_RAWFILT_1P50 }, + { SX9324_REG_PROX_CTRL1, SX9324_REG_PROX_CTRL0_GAIN_1 | + SX9324_REG_PROX_CTRL0_RAWFILT_1P50 }, + { SX9324_REG_PROX_CTRL2, SX9324_REG_PROX_CTRL2_AVGNEG_THRESH_16K }, + { SX9324_REG_PROX_CTRL3, SX9324_REG_PROX_CTRL3_AVGDEB_2SAMPLES | + SX9324_REG_PROX_CTRL3_AVGPOS_THRESH_16K }, + { SX9324_REG_PROX_CTRL4, SX9324_REG_PROX_CTRL4_AVGNEG_FILT_2 | + SX9324_REG_PROX_CTRL3_AVGPOS_FILT_256 }, + { SX9324_REG_PROX_CTRL5, 0x00 }, + { SX9324_REG_PROX_CTRL6, SX9324_REG_PROX_CTRL6_PROXTHRESH_32 }, + { SX9324_REG_PROX_CTRL7, SX9324_REG_PROX_CTRL6_PROXTHRESH_32 }, + { SX9324_REG_ADV_CTRL0, 0x00 }, + { SX9324_REG_ADV_CTRL1, 0x00 }, + { SX9324_REG_ADV_CTRL2, 0x00 }, + { SX9324_REG_ADV_CTRL3, 0x00 }, + { SX9324_REG_ADV_CTRL4, 0x00 }, + { SX9324_REG_ADV_CTRL5, SX9324_REG_ADV_CTRL5_STARTUP_SENSOR_1 | + SX9324_REG_ADV_CTRL5_STARTUP_METHOD_1 }, + { SX9324_REG_ADV_CTRL6, 0x00 }, + { SX9324_REG_ADV_CTRL7, 0x00 }, + { SX9324_REG_ADV_CTRL8, 0x00 }, + { SX9324_REG_ADV_CTRL9, 0x00 }, + /* Body/Table threshold */ + { SX9324_REG_ADV_CTRL10, 0x00 }, + { SX9324_REG_ADV_CTRL11, 0x00 }, + { SX9324_REG_ADV_CTRL12, 0x00 }, + /* TODO(gwendal): Smart SAR engine currently disabled */ + { SX9324_REG_ADV_CTRL13, 0x00 }, + { SX9324_REG_ADV_CTRL14, 0x00 }, + { SX9324_REG_ADV_CTRL15, 0x00 }, + { SX9324_REG_ADV_CTRL16, 0x00 }, + { SX9324_REG_ADV_CTRL17, 0x00 }, + { SX9324_REG_ADV_CTRL18, 0x00 }, + { SX9324_REG_ADV_CTRL19, SX9324_REG_ADV_CTRL19_HIGHT_FAILURE_THRESH_SATURATION }, + { SX9324_REG_ADV_CTRL20, SX9324_REG_ADV_CTRL19_HIGHT_FAILURE_THRESH_SATURATION }, +}; + /* Activate all channels and perform an initial compensation. */ static int sx9324_init_compensation(struct iio_dev *indio_dev) { @@ -777,6 +846,99 @@ static int sx9324_init_compensation(struct iio_dev *indio_dev) return ret; } +static const struct sx_common_reg_default * +sx9324_get_default_reg(struct device *dev, int idx, + struct sx_common_reg_default *reg_def) +{ +#define SX9324_PIN_DEF "semtech,ph0-pin" +#define SX9324_RESOLUTION_DEF "semtech,ph01-resolution" +#define SX9324_PROXRAW_DEF "semtech,ph01-proxraw-strength" + unsigned int pin_defs[SX9324_NUM_PINS]; + char prop[] = SX9324_PROXRAW_DEF; + u32 start = 0, raw = 0, pos = 0; + int ret, count, ph, pin; + + memcpy(reg_def, &sx9324_default_regs[idx], sizeof(*reg_def)); + switch (reg_def->reg) { + case SX9324_REG_AFE_PH0: + case SX9324_REG_AFE_PH1: + case SX9324_REG_AFE_PH2: + case SX9324_REG_AFE_PH3: + ph = reg_def->reg - SX9324_REG_AFE_PH0; + scnprintf(prop, ARRAY_SIZE(prop), "semtech,ph%d-pin", ph); + + count = device_property_count_u32(dev, prop); + if (count != ARRAY_SIZE(pin_defs)) + break; + ret = device_property_read_u32_array(dev, prop, pin_defs, + ARRAY_SIZE(pin_defs)); + for (pin = 0; pin < SX9324_NUM_PINS; pin++) + raw |= (pin_defs[pin] << (2 * pin)) & + SX9324_REG_AFE_PH0_PIN_MASK(pin); + reg_def->def = raw; + break; + case SX9324_REG_AFE_CTRL4: + case SX9324_REG_AFE_CTRL7: + if (reg_def->reg == SX9324_REG_AFE_CTRL4) + strncpy(prop, "semtech,ph01-resolution", + ARRAY_SIZE(prop)); + else + strncpy(prop, "semtech,ph23-resolution", + ARRAY_SIZE(prop)); + + ret = device_property_read_u32(dev, prop, &raw); + if (ret) + break; + + raw = ilog2(raw) - 3; + + reg_def->def &= ~SX9324_REG_AFE_CTRL4_RESOLUTION_MASK; + reg_def->def |= FIELD_PREP(SX9324_REG_AFE_CTRL4_RESOLUTION_MASK, + raw); + break; + case SX9324_REG_ADV_CTRL5: + ret = device_property_read_u32(dev, "semtech,startup-sensor", + &start); + if (ret) + break; + + reg_def->def &= ~SX9324_REG_ADV_CTRL5_STARTUPSENS_MASK; + reg_def->def |= FIELD_PREP(SX9324_REG_ADV_CTRL5_STARTUPSENS_MASK, + start); + break; + case SX9324_REG_PROX_CTRL4: + ret = device_property_read_u32(dev, "semtech,avg-pos-strength", + &pos); + if (ret) + break; + + /* Powers of 2, except for a gap between 16 and 64 */ + raw = clamp(ilog2(pos), 3, 11) - (pos >= 32 ? 4 : 3); + + reg_def->def &= ~SX9324_REG_PROX_CTRL4_AVGPOSFILT_MASK; + reg_def->def |= FIELD_PREP(SX9324_REG_PROX_CTRL4_AVGPOSFILT_MASK, + raw); + break; + case SX9324_REG_PROX_CTRL0: + case SX9324_REG_PROX_CTRL1: + if (reg_def->reg == SX9324_REG_PROX_CTRL0) + strncpy(prop, "semtech,ph01-proxraw-strength", + ARRAY_SIZE(prop)); + else + strncpy(prop, "semtech,ph23-proxraw-strength", + ARRAY_SIZE(prop)); + ret = device_property_read_u32(dev, prop, &raw); + if (ret) + break; + + reg_def->def &= ~SX9324_REG_PROX_CTRL0_RAWFILT_MASK; + reg_def->def |= FIELD_PREP(SX9324_REG_PROX_CTRL0_RAWFILT_MASK, + raw); + break; + } + return reg_def; +} + static int sx9324_check_whoami(struct device *dev, struct iio_dev *indio_dev) { @@ -797,12 +959,14 @@ static const struct sx_common_chip_info sx9324_chip_info = { .mask_enable_chan = SX9324_REG_GNRL_CTRL1_PHEN_MASK, .irq_msk_offset = 3, .num_channels = SX9324_NUM_CHANNELS, + .num_default_regs = ARRAY_SIZE(sx9324_default_regs), .ops = { .read_prox_data = sx9324_read_prox_data, .check_whoami = sx9324_check_whoami, .init_compensation = sx9324_init_compensation, .wait_for_sample = sx9324_wait_for_sample, + .get_default_reg = sx9324_get_default_reg, }, .iio_channels = sx9324_channels,