From patchwork Sat Jan 1 20:37:58 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Gwendal Grignou X-Patchwork-Id: 12702159 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 B87D9C433EF for ; Sat, 1 Jan 2022 20:38:07 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S232694AbiAAUiG (ORCPT ); Sat, 1 Jan 2022 15:38:06 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:33942 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S232691AbiAAUiG (ORCPT ); Sat, 1 Jan 2022 15:38:06 -0500 Received: from mail-pl1-x62b.google.com (mail-pl1-x62b.google.com [IPv6:2607:f8b0:4864:20::62b]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 13F51C061574 for ; Sat, 1 Jan 2022 12:38:06 -0800 (PST) Received: by mail-pl1-x62b.google.com with SMTP id l15so7468997pls.7 for ; Sat, 01 Jan 2022 12:38:06 -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=Aw4c6t5pNtq+DGKbqU4vIih64Io0yMvVwWny9IJ+k6M=; b=Ot0WcfTp4C8zFeKt0dOiGDSP/N9Q6ojvkltAVVQTwKFIMQN9NWuGkoWaufPM8yTAKb +/pO0HIC5L0ZchI1PrCvQbW/biZDM4Ap4OWwqg15Lf97ZugMlnCyuOf6RvzqNmOBkZcg hdCISRGwKP5ULK/MRQ6Fdhq4R5AY8vaejsKWc= 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=Aw4c6t5pNtq+DGKbqU4vIih64Io0yMvVwWny9IJ+k6M=; b=Isj/Nm3Xs7h6/ReQAjHLbEb6kZAyQ138GHSyj9q5LRmMk2CEYmgYqeJ/yBBDlWQtpd zfu6ZOmIyeZ3ejDCaBlgNw8Lb7KO7NrMH8juAaL6q6PwJ7BEVx+VyU2gnQRSWIT824sl L/B9X+/y2NNZcpFmEQagHFj3jaORzwCiAF6Cg120XzhAyNFi9DvoNPcrs9b7KuHoU4Gv /oD1q3jNwxP/EcJWdnJKdM+PxadfLfBBbs8lIDW4lwYbUzAYvFjw9xBk8ofA5WY+z5L6 wwV+t9/uFNvc4TOeVXns9PNOebpGsffn5WtjjcDEAZ3JZBw0t33u/ducJqLPfQgevp6p hIOw== X-Gm-Message-State: AOAM533sEJahodAK8HtHOlTrNzEWD+xS418Rg9BjsJm8HK7RfNkcSVCa 86TeW/3mzPeGWkpA6LFGYi4qhg== X-Google-Smtp-Source: ABdhPJw39P4/xsbmAv2WY0PoVvwb8eABSJyuWskQenEfH+eMjRFkY31guWGEIeY1ra3miUsNlHi/UA== X-Received: by 2002:a17:902:c443:b0:148:f689:d924 with SMTP id m3-20020a170902c44300b00148f689d924mr39758710plm.78.1641069485420; Sat, 01 Jan 2022 12:38:05 -0800 (PST) Received: from localhost ([2620:15c:202:201:df49:1d3f:ae08:999]) by smtp.gmail.com with UTF8SMTPSA id q17sm3792663pfj.119.2022.01.01.12.38.04 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Sat, 01 Jan 2022 12:38:05 -0800 (PST) From: Gwendal Grignou To: jic23@kernel.org, lars@metafoo.de Cc: linux-iio@vger.kernel.org, Gwendal Grignou , Stephen Boyd Subject: [PATCH v6 1/3] iio: proximity: Add sx9360 support Date: Sat, 1 Jan 2022 12:37:58 -0800 Message-Id: <20220101203800.290387-2-gwendal@chromium.org> X-Mailer: git-send-email 2.34.1.448.ga2b2bfdf31-goog In-Reply-To: <20220101203800.290387-1-gwendal@chromium.org> References: <20220101203800.290387-1-gwendal@chromium.org> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-iio@vger.kernel.org A simplified version of SX9324, it only have one pin and 2 phases (aka channels). Only one event is presented. Signed-off-by: Gwendal Grignou Reviewed-by: Stephen Boyd --- Changes since v5: - Use export namespace SEMTECH_PROX - Use sysfs_emit instead of printf for real. Changes since v4: - Use simple pm macro - Unify use of returning on default - Add space before '}' - Use sysfs_emit instead of printf. Changes since v3: - Remove "reference" as a new modifier: it is not needed, indexed channels and labels are used instead. - Use dev_get_drvdata to access iio device structure. - Use already calculated local variable - Use default: clause to return when possible. Changes since v2: - Fix issues reported during sx9324 driver review: - fix include with iwyu - Remove call to ACPI_PTR to prevent unused variable warning. - Fix panic when setting frequency to 0. - Add offset to decipher interrupt register - Fix default register value. Changes since v1: - Remove SX9360_DRIVER_NAME - Simplify whoami function - Define WHOAMI register value internally. - Handle negative values when setting sysfs parameters. drivers/iio/proximity/Kconfig | 14 + drivers/iio/proximity/Makefile | 1 + drivers/iio/proximity/sx9360.c | 809 +++++++++++++++++++++++++++++++++ 3 files changed, 824 insertions(+) create mode 100644 drivers/iio/proximity/sx9360.c diff --git a/drivers/iio/proximity/Kconfig b/drivers/iio/proximity/Kconfig index dc66f339e5b12a..0e5c17530b8bb4 100644 --- a/drivers/iio/proximity/Kconfig +++ b/drivers/iio/proximity/Kconfig @@ -145,6 +145,20 @@ config SX9324 To compile this driver as a module, choose M here: the module will be called sx9324. +config SX9360 + tristate "SX9360 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 SX9360 + proximity/button sensor, a simplified SX9324. + + To compile this driver as a module, choose M here: the + module will be called sx9360. + config SX9500 tristate "SX9500 Semtech proximity sensor" select IIO_BUFFER diff --git a/drivers/iio/proximity/Makefile b/drivers/iio/proximity/Makefile index cffe962b352718..cc838bb5408a89 100644 --- a/drivers/iio/proximity/Makefile +++ b/drivers/iio/proximity/Makefile @@ -15,6 +15,7 @@ obj-$(CONFIG_SRF04) += srf04.o obj-$(CONFIG_SRF08) += srf08.o obj-$(CONFIG_SX9310) += sx9310.o obj-$(CONFIG_SX9324) += sx9324.o +obj-$(CONFIG_SX9360) += sx9360.o obj-$(CONFIG_SX_COMMON) += sx_common.o obj-$(CONFIG_SX9500) += sx9500.o obj-$(CONFIG_VCNL3020) += vcnl3020.o diff --git a/drivers/iio/proximity/sx9360.c b/drivers/iio/proximity/sx9360.c new file mode 100644 index 00000000000000..f07d6bba07735d --- /dev/null +++ b/drivers/iio/proximity/sx9360.c @@ -0,0 +1,809 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Copyright 2021 Google LLC. + * + * Driver for Semtech's SX9360 capacitive proximity/button solution. + * Based on SX9360 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 "sx_common.h" + +/* Nominal Oscillator Frequency. */ +#define SX9360_FOSC_MHZ 4 +#define SX9360_FOSC_HZ (SX9360_FOSC_MHZ * 1000000) + +/* Register definitions. */ +#define SX9360_REG_IRQ_SRC SX_COMMON_REG_IRQ_SRC +#define SX9360_REG_STAT 0x01 +#define SX9360_REG_STAT_COMPSTAT_MASK GENMASK(2, 1) +#define SX9360_REG_IRQ_MSK 0x02 +#define SX9360_CONVDONE_IRQ BIT(0) +#define SX9360_FAR_IRQ BIT(2) +#define SX9360_CLOSE_IRQ BIT(3) +#define SX9360_REG_IRQ_CFG 0x03 + +#define SX9360_REG_GNRL_CTRL0 0x10 +#define SX9360_REG_GNRL_CTRL0_PHEN_MASK GENMASK(1, 0) +#define SX9360_REG_GNRL_CTRL1 0x11 +#define SX9360_REG_GNRL_CTRL1_SCANPERIOD_MASK GENMASK(2, 0) +#define SX9360_REG_GNRL_CTRL2 0x12 +#define SX9360_REG_GNRL_CTRL2_PERIOD_102MS 0x32 +#define SX9360_REG_GNRL_REG_2_PERIOD_MS(_r) \ + (((_r) * 8192) / (SX9360_FOSC_HZ / 1000)) +#define SX9360_REG_GNRL_FREQ_2_REG(_f) (((_f) * 8192) / SX9360_FOSC_HZ) +#define SX9360_REG_GNRL_REG_2_FREQ(_r) (SX9360_FOSC_HZ / ((_r) * 8192)) + +#define SX9360_REG_AFE_CTRL1 0x21 +#define SX9360_REG_AFE_PARAM0_PHR 0x22 +#define SX9360_REG_AFE_PARAM1_PHR 0x23 +#define SX9360_REG_AFE_PARAM0_PHM 0x24 +#define SX9360_REG_AFE_PARAM0_RSVD 0x08 +#define SX9360_REG_AFE_PARAM0_RESOLUTION_MASK GENMASK(2, 0) +#define SX9360_REG_AFE_PARAM0_RESOLUTION_128 0x02 +#define SX9360_REG_AFE_PARAM1_PHM 0x25 +#define SX9360_REG_AFE_PARAM1_AGAIN_PHM_6PF 0x40 +#define SX9360_REG_AFE_PARAM1_FREQ_83_33HZ 0x06 + +#define SX9360_REG_PROX_CTRL0_PHR 0x40 +#define SX9360_REG_PROX_CTRL0_PHM 0x41 +#define SX9360_REG_PROX_CTRL0_GAIN_MASK GENMASK(5, 3) +#define SX9360_REG_PROX_CTRL0_GAIN_1 0x80 +#define SX9360_REG_PROX_CTRL0_RAWFILT_1P50 0x01 +#define SX9360_REG_PROX_CTRL1 0x42 +#define SX9360_REG_PROX_CTRL1_AVGNEG_THRESH_MASK GENMASK(5, 3) +#define SX9360_REG_PROX_CTRL1_AVGNEG_THRESH_16K 0x20 +#define SX9360_REG_PROX_CTRL2 0x43 +#define SX9360_REG_PROX_CTRL2_AVGDEB_MASK GENMASK(7, 6) +#define SX9360_REG_PROX_CTRL2_AVGDEB_2SAMPLES 0x40 +#define SX9360_REG_PROX_CTRL2_AVGPOS_THRESH_16K 0x20 +#define SX9360_REG_PROX_CTRL3 0x44 +#define SX9360_REG_PROX_CTRL3_AVGNEG_FILT_MASK GENMASK(5, 3) +#define SX9360_REG_PROX_CTRL3_AVGNEG_FILT_2 0x08 +#define SX9360_REG_PROX_CTRL3_AVGPOS_FILT_MASK GENMASK(2, 0) +#define SX9360_REG_PROX_CTRL3_AVGPOS_FILT_256 0x04 +#define SX9360_REG_PROX_CTRL4 0x45 +#define SX9360_REG_PROX_CTRL4_HYST_MASK GENMASK(5, 4) +#define SX9360_REG_PROX_CTRL4_CLOSE_DEBOUNCE_MASK GENMASK(3, 2) +#define SX9360_REG_PROX_CTRL4_FAR_DEBOUNCE_MASK GENMASK(1, 0) +#define SX9360_REG_PROX_CTRL5 0x46 +#define SX9360_REG_PROX_CTRL5_PROXTHRESH_32 0x08 + +#define SX9360_REG_REF_CORR0 0x60 +#define SX9360_REG_REF_CORR1 0x61 + +#define SX9360_REG_USEFUL_PHR_MSB 0x90 +#define SX9360_REG_USEFUL_PHR_LSB 0x91 + +#define SX9360_REG_OFFSET_PMR_MSB 0x92 +#define SX9360_REG_OFFSET_PMR_LSB 0x93 + +#define SX9360_REG_USEFUL_PHM_MSB 0x94 +#define SX9360_REG_USEFUL_PHM_LSB 0x95 + +#define SX9360_REG_AVG_PHM_MSB 0x96 +#define SX9360_REG_AVG_PHM_LSB 0x97 + +#define SX9360_REG_DIFF_PHM_MSB 0x98 +#define SX9360_REG_DIFF_PHM_LSB 0x99 + +#define SX9360_REG_OFFSET_PHM_MSB 0x9a +#define SX9360_REG_OFFSET_PHM_LSB 0x9b + +#define SX9360_REG_USE_FILTER_MSB 0x9a +#define SX9360_REG_USE_FILTER_LSB 0x9b + +#define SX9360_REG_RESET 0xcf +/* Write this to REG_RESET to do a soft reset. */ +#define SX9360_SOFT_RESET 0xde + +#define SX9360_REG_WHOAMI 0xfa +#define SX9360_WHOAMI_VALUE 0x60 + +#define SX9360_REG_REVISION 0xfe + +/* 2 channels, Phase Reference and Measurement. */ +#define SX9360_NUM_CHANNELS 2 + +static const struct iio_chan_spec sx9360_channels[] = { + { + .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, + .address = SX9360_REG_USEFUL_PHR_MSB, + .channel = 0, + .scan_index = 0, + .scan_type = { + .sign = 's', + .realbits = 12, + .storagebits = 16, + .endianness = IIO_BE, + }, + }, + { + .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, + .address = SX9360_REG_USEFUL_PHM_MSB, + .event_spec = sx_common_events, + .num_event_specs = ARRAY_SIZE(sx_common_events), + .channel = 1, + .scan_index = 1, + .scan_type = { + .sign = 's', + .realbits = 12, + .storagebits = 16, + .endianness = IIO_BE, + }, + }, + IIO_CHAN_SOFT_TIMESTAMP(2), +}; + +/* + * 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. + * + * The frequency control register holds the period, with a ~2ms increment. + * Therefore the smallest frequency is 4MHz / (2047 * 8192), + * The fastest is 4MHz / 8192. + * The interval is not linear, but given there is 2047 possible value, + * Returns the fake increment of (Max-Min)/2047 + */ +static const struct { + int val; + int val2; +} sx9360_samp_freq_interval[] = { + {0, 281250 }, /* 4MHz / (8192 * 2047) */ + {0, 281250 }, + {448, 281250 }, /* 4MHz / 8192 */ +}; + +static const struct regmap_range sx9360_writable_reg_ranges[] = { + /* + * To set COMPSTAT for compensation, even if datasheet says register is + * RO. + */ + regmap_reg_range(SX9360_REG_STAT, SX9360_REG_IRQ_CFG), + regmap_reg_range(SX9360_REG_GNRL_CTRL0, SX9360_REG_GNRL_CTRL2), + regmap_reg_range(SX9360_REG_AFE_CTRL1, SX9360_REG_AFE_PARAM1_PHM), + regmap_reg_range(SX9360_REG_PROX_CTRL0_PHR, SX9360_REG_PROX_CTRL5), + regmap_reg_range(SX9360_REG_REF_CORR0, SX9360_REG_REF_CORR1), + regmap_reg_range(SX9360_REG_OFFSET_PMR_MSB, SX9360_REG_OFFSET_PMR_LSB), + regmap_reg_range(SX9360_REG_RESET, SX9360_REG_RESET), +}; + +static const struct regmap_access_table sx9360_writeable_regs = { + .yes_ranges = sx9360_writable_reg_ranges, + .n_yes_ranges = ARRAY_SIZE(sx9360_writable_reg_ranges), +}; + +/* + * All allocated registers are readable, so we just list unallocated + * ones. + */ +static const struct regmap_range sx9360_non_readable_reg_ranges[] = { + regmap_reg_range(SX9360_REG_IRQ_CFG + 1, SX9360_REG_GNRL_CTRL0 - 1), + regmap_reg_range(SX9360_REG_GNRL_CTRL2 + 1, SX9360_REG_AFE_CTRL1 - 1), + regmap_reg_range(SX9360_REG_AFE_PARAM1_PHM + 1, + SX9360_REG_PROX_CTRL0_PHR - 1), + regmap_reg_range(SX9360_REG_PROX_CTRL5 + 1, SX9360_REG_REF_CORR0 - 1), + regmap_reg_range(SX9360_REG_REF_CORR1 + 1, + SX9360_REG_USEFUL_PHR_MSB - 1), + regmap_reg_range(SX9360_REG_USE_FILTER_LSB + 1, SX9360_REG_RESET - 1), + regmap_reg_range(SX9360_REG_RESET + 1, SX9360_REG_WHOAMI - 1), + regmap_reg_range(SX9360_REG_WHOAMI + 1, SX9360_REG_REVISION - 1), +}; + +static const struct regmap_access_table sx9360_readable_regs = { + .no_ranges = sx9360_non_readable_reg_ranges, + .n_no_ranges = ARRAY_SIZE(sx9360_non_readable_reg_ranges), +}; + +static const struct regmap_range sx9360_volatile_reg_ranges[] = { + regmap_reg_range(SX9360_REG_IRQ_SRC, SX9360_REG_STAT), + regmap_reg_range(SX9360_REG_USEFUL_PHR_MSB, SX9360_REG_USE_FILTER_LSB), + regmap_reg_range(SX9360_REG_WHOAMI, SX9360_REG_WHOAMI), + regmap_reg_range(SX9360_REG_REVISION, SX9360_REG_REVISION), +}; + +static const struct regmap_access_table sx9360_volatile_regs = { + .yes_ranges = sx9360_volatile_reg_ranges, + .n_yes_ranges = ARRAY_SIZE(sx9360_volatile_reg_ranges), +}; + +static const struct regmap_config sx9360_regmap_config = { + .reg_bits = 8, + .val_bits = 8, + + .max_register = SX9360_REG_REVISION, + .cache_type = REGCACHE_RBTREE, + + .wr_table = &sx9360_writeable_regs, + .rd_table = &sx9360_readable_regs, + .volatile_table = &sx9360_volatile_regs, +}; + +static int sx9360_read_prox_data(struct sx_common_data *data, + const struct iio_chan_spec *chan, + __be16 *val) +{ + 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 sx9360_wait_for_sample(struct sx_common_data *data) +{ + int ret; + __be16 buf; + + ret = regmap_bulk_read(data->regmap, SX9360_REG_GNRL_CTRL1, + &buf, sizeof(buf)); + if (ret < 0) + return ret; + msleep(SX9360_REG_GNRL_REG_2_PERIOD_MS(be16_to_cpu(buf))); + + return 0; +} + +static int sx9360_read_gain(struct sx_common_data *data, + const struct iio_chan_spec *chan, int *val) +{ + unsigned int reg, regval; + int ret; + + reg = SX9360_REG_PROX_CTRL0_PHR + chan->channel; + ret = regmap_read(data->regmap, reg, ®val); + if (ret) + return ret; + + *val = 1 << FIELD_GET(SX9360_REG_PROX_CTRL0_GAIN_MASK, regval); + + return IIO_VAL_INT; +} + +static int sx9360_read_samp_freq(struct sx_common_data *data, + int *val, int *val2) +{ + int ret, divisor; + __be16 buf; + + ret = regmap_bulk_read(data->regmap, SX9360_REG_GNRL_CTRL1, + &buf, sizeof(buf)); + if (ret < 0) + return ret; + divisor = be16_to_cpu(buf); + if (divisor == 0) { + *val = 0; + return IIO_VAL_INT; + } + + *val = SX9360_FOSC_HZ; + *val2 = divisor * 8192; + + return IIO_VAL_FRACTIONAL; +} + +static int sx9360_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 = sx9360_read_gain(data, chan, val); + iio_device_release_direct_mode(indio_dev); + return ret; + case IIO_CHAN_INFO_SAMP_FREQ: + return sx9360_read_samp_freq(data, val, val2); + default: + return -EINVAL; + } +} + +static const char *sx9360_channel_labels[SX9360_NUM_CHANNELS] = { + "reference", "main", +}; + +static int sx9360_read_label(struct iio_dev *iio_dev, const struct iio_chan_spec *chan, + char *label) +{ + return sysfs_emit(label, "%s\n", sx9360_channel_labels[chan->channel]); +} + +static const int sx9360_gain_vals[] = { 1, 2, 4, 8 }; + +static int sx9360_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(sx9360_gain_vals); + *vals = sx9360_gain_vals; + return IIO_AVAIL_LIST; + case IIO_CHAN_INFO_SAMP_FREQ: + *type = IIO_VAL_INT_PLUS_MICRO; + *length = ARRAY_SIZE(sx9360_samp_freq_interval) * 2; + *vals = (int *)sx9360_samp_freq_interval; + return IIO_AVAIL_RANGE; + default: + return -EINVAL; + } +} + +static int sx9360_set_samp_freq(struct sx_common_data *data, + int val, int val2) +{ + int ret, reg; + __be16 buf; + + reg = val * 8192 / SX9360_FOSC_HZ + val2 * 8192 / (SX9360_FOSC_MHZ); + buf = cpu_to_be16(val); + mutex_lock(&data->mutex); + + ret = regmap_bulk_write(data->regmap, SX9360_REG_GNRL_CTRL1, &buf, + sizeof(buf)); + + mutex_unlock(&data->mutex); + + return ret; +} + +static int sx9360_read_thresh(struct sx_common_data *data, int *val) +{ + unsigned int regval; + int ret; + + ret = regmap_read(data->regmap, SX9360_REG_PROX_CTRL5, ®val); + if (ret) + return ret; + + if (regval <= 1) + *val = regval; + else + *val = (regval * regval) / 2; + + return IIO_VAL_INT; +} + +static int sx9360_read_hysteresis(struct sx_common_data *data, int *val) +{ + unsigned int regval, pthresh; + int ret; + + ret = sx9360_read_thresh(data, &pthresh); + if (ret < 0) + return ret; + + ret = regmap_read(data->regmap, SX9360_REG_PROX_CTRL4, ®val); + if (ret) + return ret; + + regval = FIELD_GET(SX9360_REG_PROX_CTRL4_HYST_MASK, regval); + if (!regval) + *val = 0; + else + *val = pthresh >> (5 - regval); + + return IIO_VAL_INT; +} + +static int sx9360_read_far_debounce(struct sx_common_data *data, int *val) +{ + unsigned int regval; + int ret; + + ret = regmap_read(data->regmap, SX9360_REG_PROX_CTRL4, ®val); + if (ret) + return ret; + + regval = FIELD_GET(SX9360_REG_PROX_CTRL4_FAR_DEBOUNCE_MASK, regval); + if (regval) + *val = 1 << regval; + else + *val = 0; + + return IIO_VAL_INT; +} + +static int sx9360_read_close_debounce(struct sx_common_data *data, int *val) +{ + unsigned int regval; + int ret; + + ret = regmap_read(data->regmap, SX9360_REG_PROX_CTRL4, ®val); + if (ret) + return ret; + + regval = FIELD_GET(SX9360_REG_PROX_CTRL4_CLOSE_DEBOUNCE_MASK, regval); + if (regval) + *val = 1 << regval; + else + *val = 0; + + return IIO_VAL_INT; +} + +static int sx9360_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 sx9360_read_thresh(data, val); + case IIO_EV_INFO_PERIOD: + switch (dir) { + case IIO_EV_DIR_RISING: + return sx9360_read_far_debounce(data, val); + case IIO_EV_DIR_FALLING: + return sx9360_read_close_debounce(data, val); + default: + return -EINVAL; + } + case IIO_EV_INFO_HYSTERESIS: + return sx9360_read_hysteresis(data, val); + default: + return -EINVAL; + } +} + +static int sx9360_write_thresh(struct sx_common_data *data, int _val) +{ + unsigned int val = _val; + int ret; + + if (val >= 1) + val = int_sqrt(2 * val); + + if (val > 0xff) + return -EINVAL; + + mutex_lock(&data->mutex); + ret = regmap_write(data->regmap, SX9360_REG_PROX_CTRL5, val); + mutex_unlock(&data->mutex); + + return ret; +} + +static int sx9360_write_hysteresis(struct sx_common_data *data, int _val) +{ + unsigned int hyst, val = _val; + int ret, pthresh; + + ret = sx9360_read_thresh(data, &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(SX9360_REG_PROX_CTRL4_HYST_MASK, hyst); + mutex_lock(&data->mutex); + ret = regmap_update_bits(data->regmap, SX9360_REG_PROX_CTRL4, + SX9360_REG_PROX_CTRL4_HYST_MASK, hyst); + mutex_unlock(&data->mutex); + + return ret; +} + +static int sx9360_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(SX9360_REG_PROX_CTRL4_FAR_DEBOUNCE_MASK, val)) + return -EINVAL; + + regval = FIELD_PREP(SX9360_REG_PROX_CTRL4_FAR_DEBOUNCE_MASK, val); + + mutex_lock(&data->mutex); + ret = regmap_update_bits(data->regmap, SX9360_REG_PROX_CTRL4, + SX9360_REG_PROX_CTRL4_FAR_DEBOUNCE_MASK, + regval); + mutex_unlock(&data->mutex); + + return ret; +} + +static int sx9360_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(SX9360_REG_PROX_CTRL4_CLOSE_DEBOUNCE_MASK, val)) + return -EINVAL; + + regval = FIELD_PREP(SX9360_REG_PROX_CTRL4_CLOSE_DEBOUNCE_MASK, val); + + mutex_lock(&data->mutex); + ret = regmap_update_bits(data->regmap, SX9360_REG_PROX_CTRL4, + SX9360_REG_PROX_CTRL4_CLOSE_DEBOUNCE_MASK, + regval); + mutex_unlock(&data->mutex); + + return ret; +} + +static int sx9360_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 sx9360_write_thresh(data, val); + case IIO_EV_INFO_PERIOD: + switch (dir) { + case IIO_EV_DIR_RISING: + return sx9360_write_far_debounce(data, val); + case IIO_EV_DIR_FALLING: + return sx9360_write_close_debounce(data, val); + default: + return -EINVAL; + } + case IIO_EV_INFO_HYSTERESIS: + return sx9360_write_hysteresis(data, val); + default: + return -EINVAL; + } +} + +static int sx9360_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 = SX9360_REG_PROX_CTRL0_PHR + chan->channel; + gain = FIELD_PREP(SX9360_REG_PROX_CTRL0_GAIN_MASK, gain); + + mutex_lock(&data->mutex); + ret = regmap_update_bits(data->regmap, reg, + SX9360_REG_PROX_CTRL0_GAIN_MASK, + gain); + mutex_unlock(&data->mutex); + + return ret; +} + +static int sx9360_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 sx9360_set_samp_freq(data, val, val2); + case IIO_CHAN_INFO_HARDWAREGAIN: + return sx9360_write_gain(data, chan, val); + default: + return -EINVAL; + } +} + +/* Activate all channels and perform an initial compensation. */ +static int sx9360_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, SX9360_REG_STAT, + SX9360_REG_STAT_COMPSTAT_MASK, + SX9360_REG_STAT_COMPSTAT_MASK); + if (ret) + return ret; + + return regmap_read_poll_timeout(data->regmap, SX9360_REG_STAT, val, + !(val & SX9360_REG_STAT_COMPSTAT_MASK), + 20000, 2000000); +} + +static int sx9360_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 = "sx9360"; + return 0; +} + +static const struct sx_common_chip_info sx9360_chip_info = { + .reg_stat = SX9360_REG_STAT, + .reg_irq_msk = SX9360_REG_IRQ_MSK, + .reg_enable_chan = SX9360_REG_GNRL_CTRL0, + .reg_reset = SX9360_REG_RESET, + + .mask_enable_chan = SX9360_REG_GNRL_CTRL0_PHEN_MASK, + .stat_offset = 3, + .num_channels = SX9360_NUM_CHANNELS, + + .ops = { + .read_prox_data = sx9360_read_prox_data, + .check_whoami = sx9360_check_whoami, + .init_compensation = sx9360_init_compensation, + .wait_for_sample = sx9360_wait_for_sample, + }, + + .iio_channels = sx9360_channels, + .num_iio_channels = ARRAY_SIZE(sx9360_channels), + .iio_info = { + .read_raw = sx9360_read_raw, + .read_avail = sx9360_read_avail, + .read_label = sx9360_read_label, + .read_event_value = sx9360_read_event_val, + .write_event_value = sx9360_write_event_val, + .write_raw = sx9360_write_raw, + .read_event_config = sx_common_read_event_config, + .write_event_config = sx_common_write_event_config, + }, +}; + +static int sx9360_probe(struct i2c_client *client) +{ + return sx_common_probe(client, &sx9360_chip_info, &sx9360_regmap_config); +} + +static int __maybe_unused sx9360_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, SX9360_REG_GNRL_CTRL0, ®val); + + data->suspend_ctrl = + FIELD_GET(SX9360_REG_GNRL_CTRL0_PHEN_MASK, regval); + + if (ret < 0) + goto out; + + /* Disable all phases, send the device to sleep. */ + ret = regmap_write(data->regmap, SX9360_REG_GNRL_CTRL0, 0); + +out: + mutex_unlock(&data->mutex); + return ret; +} + +static int __maybe_unused sx9360_resume(struct device *dev) +{ + struct sx_common_data *data = iio_priv(dev_get_drvdata(dev)); + int ret; + + mutex_lock(&data->mutex); + ret = regmap_update_bits(data->regmap, SX9360_REG_GNRL_CTRL0, + SX9360_REG_GNRL_CTRL0_PHEN_MASK, + data->suspend_ctrl); + mutex_unlock(&data->mutex); + if (ret) + return ret; + + enable_irq(data->client->irq); + return 0; +} + +static SIMPLE_DEV_PM_OPS(sx9360_pm_ops, sx9360_suspend, sx9360_resume); + +static const struct acpi_device_id sx9360_acpi_match[] = { + { "STH9360", SX9360_WHOAMI_VALUE }, + { } +}; +MODULE_DEVICE_TABLE(acpi, sx9360_acpi_match); + +static const struct of_device_id sx9360_of_match[] = { + { .compatible = "semtech,sx9360", (void *)SX9360_WHOAMI_VALUE }, + { } +}; +MODULE_DEVICE_TABLE(of, sx9360_of_match); + +static const struct i2c_device_id sx9360_id[] = { + {"sx9360", SX9360_WHOAMI_VALUE }, + { } +}; +MODULE_DEVICE_TABLE(i2c, sx9360_id); + +static struct i2c_driver sx9360_driver = { + .driver = { + .name = "sx9360", + .acpi_match_table = sx9360_acpi_match, + .of_match_table = sx9360_of_match, + .pm = &sx9360_pm_ops, + + /* + * Lots of i2c transfers in probe + over 200 ms waiting in + * sx9360_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 = sx9360_probe, + .id_table = sx9360_id, +}; +module_i2c_driver(sx9360_driver); + +MODULE_AUTHOR("Gwendal Grignou "); +MODULE_DESCRIPTION("Driver for Semtech SX9360 proximity sensor"); +MODULE_LICENSE("GPL v2"); +MODULE_IMPORT_NS(SEMTECH_PROX);