From patchwork Wed Apr 20 21:11:00 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Jagath Jog J X-Patchwork-Id: 12820826 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 EC934C433EF for ; Wed, 20 Apr 2022 21:11:22 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1382377AbiDTVOI (ORCPT ); Wed, 20 Apr 2022 17:14:08 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:52212 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1382368AbiDTVOG (ORCPT ); Wed, 20 Apr 2022 17:14:06 -0400 Received: from mail-pg1-x52e.google.com (mail-pg1-x52e.google.com [IPv6:2607:f8b0:4864:20::52e]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id BDB7847AFB; Wed, 20 Apr 2022 14:11:18 -0700 (PDT) Received: by mail-pg1-x52e.google.com with SMTP id t4so2839589pgc.1; Wed, 20 Apr 2022 14:11:18 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20210112; h=from:to:cc:subject:date:message-id:in-reply-to:references; bh=358PWS7msgQ1RPNVWPekZXGpRach+SDsp5gVHY2rRwI=; b=ceE+lgRtVyLiaQ9adyQOj6k+kHENGxqYJC05I7mCeSsw2+KA8HDbKa5HJNng8QT5vP Fd2fI69jqq0fcjVCacdkMZzGGqFz2bEErjhMABgM71SBRp0/G7ylsJMrRYxUC8EFY6nt B+ZZDMXJnCj/NW5fnShcvpVNVbZ654ORdE2TAwjbs4xtqWz0k072hLd9yZx8W3kdfbmY HIwrtsRf9PLWlpo5Syd2MNCgkHAacqALwBAGgW9WHwnYCEqj2te4NAEazDcoVwzAGQeV tohkyuImYmxf8rlWF8tropyxcrnCr0T/lRHOEpQQR4WzwJG7pbBUlimkGQ3P6Lgl8EjF SNig== 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; bh=358PWS7msgQ1RPNVWPekZXGpRach+SDsp5gVHY2rRwI=; b=W1blF6EMPPH5j3wCqe7J/AvjFQ87pZ5a7VftWf+DqprLRSo5dwVT6iTGnOIhO6moJb ZITKJbwjvEUD3Ocd+GLIP8InNCToD/Tqwz85lxaa6tDMnYGKlPtnFtb8nuO5+xq3Osj+ SXpDrVhbsvv4lTxB1mWRV6njk7fO2XVWND+eOtfNrAK1exlX9naKWNQGHjDZD3XWrMpt L+/LezXCurs/e3Qn/XC+dB465Kw9pBVaERS7YtgCSKnItwC8TwSMqthDaBP4FO71Jxzx wSp91oGsKK0T6l85zXCLVkvV86fthKS3txEZ9KnTiZwlRV+90ec/zAo/11pmrxPISCap zNmA== X-Gm-Message-State: AOAM532lXz62g09r/KiHtAgxRSrmxTbT698Bo3WZ5e26YDbRAruQHuoH IsU9ourPrn9HOp58uZie+vY= X-Google-Smtp-Source: ABdhPJzX80F6GavIO1BJR+E+bxV0QnIM+c7eWHEVB/dm4LaZKc20TwgaEAvg8GM+9BERl3ZXQw8zzg== X-Received: by 2002:a05:6a00:170d:b0:50a:858e:2b6e with SMTP id h13-20020a056a00170d00b0050a858e2b6emr14770393pfc.48.1650489078190; Wed, 20 Apr 2022 14:11:18 -0700 (PDT) Received: from localhost.localdomain ([27.7.104.83]) by smtp.gmail.com with ESMTPSA id v13-20020a17090a00cd00b001cd4989fee4sm106652pjd.48.2022.04.20.14.11.16 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 20 Apr 2022 14:11:17 -0700 (PDT) From: Jagath Jog J To: dan@dlrobertson.com, jic23@kernel.org, andy.shevchenko@gmail.com Cc: linux-iio@vger.kernel.org, linux-kernel@vger.kernel.org Subject: [PATCH v4 4/9] iio: accel: bma400: Add triggered buffer support Date: Thu, 21 Apr 2022 02:41:00 +0530 Message-Id: <20220420211105.14654-5-jagathjog1996@gmail.com> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20220420211105.14654-1-jagathjog1996@gmail.com> References: <20220420211105.14654-1-jagathjog1996@gmail.com> Precedence: bulk List-ID: X-Mailing-List: linux-iio@vger.kernel.org Added trigger buffer support to read continuous acceleration data from device with data ready interrupt which is mapped to INT1 pin. Signed-off-by: Jagath Jog J Reviewed-by: Andy Shevchenko --- drivers/iio/accel/Kconfig | 2 + drivers/iio/accel/bma400.h | 10 +- drivers/iio/accel/bma400_core.c | 162 +++++++++++++++++++++++++++++++- drivers/iio/accel/bma400_i2c.c | 2 +- drivers/iio/accel/bma400_spi.c | 2 +- 5 files changed, 170 insertions(+), 8 deletions(-) diff --git a/drivers/iio/accel/Kconfig b/drivers/iio/accel/Kconfig index eac3f02662ae..958097814232 100644 --- a/drivers/iio/accel/Kconfig +++ b/drivers/iio/accel/Kconfig @@ -204,6 +204,8 @@ config BMA220 config BMA400 tristate "Bosch BMA400 3-Axis Accelerometer Driver" select REGMAP + select IIO_BUFFER + select IIO_TRIGGERED_BUFFER select BMA400_I2C if I2C select BMA400_SPI if SPI help diff --git a/drivers/iio/accel/bma400.h b/drivers/iio/accel/bma400.h index 1c8c47a9a317..907e1a6c0a38 100644 --- a/drivers/iio/accel/bma400.h +++ b/drivers/iio/accel/bma400.h @@ -62,6 +62,13 @@ #define BMA400_ACC_CONFIG2_REG 0x1b #define BMA400_CMD_REG 0x7e +/* Interrupt registers */ +#define BMA400_INT_CONFIG0_REG 0x1f +#define BMA400_INT_CONFIG1_REG 0x20 +#define BMA400_INT1_MAP_REG 0x21 +#define BMA400_INT_IO_CTRL_REG 0x24 +#define BMA400_INT_DRDY_MSK BIT(7) + /* Chip ID of BMA 400 devices found in the chip ID register. */ #define BMA400_ID_REG_VAL 0x90 @@ -111,6 +118,7 @@ extern const struct regmap_config bma400_regmap_config; -int bma400_probe(struct device *dev, struct regmap *regmap, const char *name); +int bma400_probe(struct device *dev, struct regmap *regmap, int irq, + const char *name); #endif diff --git a/drivers/iio/accel/bma400_core.c b/drivers/iio/accel/bma400_core.c index 07674d89d978..57910ccf9180 100644 --- a/drivers/iio/accel/bma400_core.c +++ b/drivers/iio/accel/bma400_core.c @@ -11,6 +11,7 @@ * - Create channel for sensor time */ +#include #include #include #include @@ -20,6 +21,10 @@ #include #include +#include +#include +#include +#include #include "bma400.h" @@ -61,6 +66,14 @@ struct bma400_data { struct bma400_sample_freq sample_freq; int oversampling_ratio; int scale; + struct iio_trigger *trig; + /* Correct time stamp alignment */ + struct { + __le16 buff[3]; + u8 temperature; + s64 ts __aligned(8); + } buffer ____cacheline_aligned; + __le16 status; }; static bool bma400_is_writable_reg(struct device *dev, unsigned int reg) @@ -152,7 +165,7 @@ static const struct iio_chan_spec_ext_info bma400_ext_info[] = { { } }; -#define BMA400_ACC_CHANNEL(_axis) { \ +#define BMA400_ACC_CHANNEL(_index, _axis) { \ .type = IIO_ACCEL, \ .modified = 1, \ .channel2 = IIO_MOD_##_axis, \ @@ -164,17 +177,32 @@ static const struct iio_chan_spec_ext_info bma400_ext_info[] = { BIT(IIO_CHAN_INFO_SCALE) | \ BIT(IIO_CHAN_INFO_OVERSAMPLING_RATIO), \ .ext_info = bma400_ext_info, \ + .scan_index = _index, \ + .scan_type = { \ + .sign = 's', \ + .realbits = 12, \ + .storagebits = 16, \ + .endianness = IIO_LE, \ + }, \ } static const struct iio_chan_spec bma400_channels[] = { - BMA400_ACC_CHANNEL(X), - BMA400_ACC_CHANNEL(Y), - BMA400_ACC_CHANNEL(Z), + BMA400_ACC_CHANNEL(0, X), + BMA400_ACC_CHANNEL(1, Y), + BMA400_ACC_CHANNEL(2, Z), { .type = IIO_TEMP, .info_mask_separate = BIT(IIO_CHAN_INFO_PROCESSED), .info_mask_shared_by_type = BIT(IIO_CHAN_INFO_SAMP_FREQ), + .scan_index = 3, + .scan_type = { + .sign = 's', + .realbits = 8, + .storagebits = 8, + .endianness = IIO_LE, + }, }, + IIO_CHAN_SOFT_TIMESTAMP(4), }; static int bma400_get_temp_reg(struct bma400_data *data, int *val, int *val2) @@ -659,6 +687,10 @@ static int bma400_init(struct bma400_data *data) if (ret) return ret; + /* Configure INT1 pin to open drain */ + ret = regmap_write(data->regmap, BMA400_INT_IO_CTRL_REG, 0x06); + if (ret) + return ret; /* * Once the interrupt engine is supported we might use the * data_src_reg, but for now ensure this is set to the @@ -807,6 +839,29 @@ static int bma400_write_raw_get_fmt(struct iio_dev *indio_dev, } } +static int bma400_data_rdy_trigger_set_state(struct iio_trigger *trig, + bool state) +{ + struct iio_dev *indio_dev = iio_trigger_get_drvdata(trig); + struct bma400_data *data = iio_priv(indio_dev); + int ret; + + ret = regmap_update_bits(data->regmap, BMA400_INT_CONFIG0_REG, + BMA400_INT_DRDY_MSK, + FIELD_PREP(BMA400_INT_DRDY_MSK, state)); + if (ret) + return ret; + + return regmap_update_bits(data->regmap, BMA400_INT1_MAP_REG, + BMA400_INT_DRDY_MSK, + FIELD_PREP(BMA400_INT_DRDY_MSK, state)); +} + +static const unsigned long bma400_avail_scan_masks[] = { + GENMASK(3, 0), + 0 +}; + static const struct iio_info bma400_info = { .read_raw = bma400_read_raw, .read_avail = bma400_read_avail, @@ -814,7 +869,72 @@ static const struct iio_info bma400_info = { .write_raw_get_fmt = bma400_write_raw_get_fmt, }; -int bma400_probe(struct device *dev, struct regmap *regmap, const char *name) +static const struct iio_trigger_ops bma400_trigger_ops = { + .set_trigger_state = &bma400_data_rdy_trigger_set_state, + .validate_device = &iio_trigger_validate_own_device, +}; + +static irqreturn_t bma400_trigger_handler(int irq, void *p) +{ + struct iio_poll_func *pf = p; + struct iio_dev *indio_dev = pf->indio_dev; + struct bma400_data *data = iio_priv(indio_dev); + int ret, temp; + + /* Lock to protect the data->buffer */ + mutex_lock(&data->mutex); + + /* bulk read six registers, with the base being the LSB register */ + ret = regmap_bulk_read(data->regmap, BMA400_X_AXIS_LSB_REG, + &data->buffer.buff, sizeof(data->buffer.buff)); + if (ret) + goto unlock_err; + + ret = regmap_read(data->regmap, BMA400_TEMP_DATA_REG, &temp); + if (ret) + goto unlock_err; + + data->buffer.temperature = temp; + + iio_push_to_buffers_with_timestamp(indio_dev, &data->buffer, + iio_get_time_ns(indio_dev)); + + mutex_unlock(&data->mutex); + iio_trigger_notify_done(indio_dev->trig); + return IRQ_HANDLED; + +unlock_err: + mutex_unlock(&data->mutex); + return IRQ_NONE; +} + +static irqreturn_t bma400_interrupt(int irq, void *private) +{ + struct iio_dev *indio_dev = private; + struct bma400_data *data = iio_priv(indio_dev); + int ret; + + /* Lock to protect the data->status */ + mutex_lock(&data->mutex); + ret = regmap_bulk_read(data->regmap, BMA400_INT_STAT0_REG, + &data->status, + sizeof(data->status)); + if (ret) + goto unlock_err; + + if (FIELD_GET(BMA400_INT_DRDY_MSK, le16_to_cpu(data->status))) { + mutex_unlock(&data->mutex); + iio_trigger_poll_chained(data->trig); + return IRQ_HANDLED; + } + +unlock_err: + mutex_unlock(&data->mutex); + return IRQ_NONE; +} + +int bma400_probe(struct device *dev, struct regmap *regmap, int irq, + const char *name) { struct iio_dev *indio_dev; struct bma400_data *data; @@ -841,8 +961,40 @@ int bma400_probe(struct device *dev, struct regmap *regmap, const char *name) indio_dev->info = &bma400_info; indio_dev->channels = bma400_channels; indio_dev->num_channels = ARRAY_SIZE(bma400_channels); + indio_dev->available_scan_masks = bma400_avail_scan_masks; indio_dev->modes = INDIO_DIRECT_MODE; + if (irq > 0) { + 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 = &bma400_trigger_ops; + iio_trigger_set_drvdata(data->trig, indio_dev); + + ret = devm_iio_trigger_register(data->dev, data->trig); + if (ret) + return dev_err_probe(data->dev, ret, + "iio trigger register fail\n"); + + indio_dev->trig = iio_trigger_get(data->trig); + ret = devm_request_threaded_irq(dev, irq, NULL, + &bma400_interrupt, + IRQF_TRIGGER_RISING | IRQF_ONESHOT, + indio_dev->name, indio_dev); + if (ret) + return dev_err_probe(data->dev, ret, + "request irq %d failed\n", irq); + } + + ret = devm_iio_triggered_buffer_setup(dev, indio_dev, NULL, + &bma400_trigger_handler, NULL); + if (ret) + return dev_err_probe(data->dev, ret, + "iio triggered buffer setup failed\n"); + return devm_iio_device_register(dev, indio_dev); } EXPORT_SYMBOL_NS(bma400_probe, IIO_BMA400); diff --git a/drivers/iio/accel/bma400_i2c.c b/drivers/iio/accel/bma400_i2c.c index 4f6e01a3b3a1..1ba2a982ea73 100644 --- a/drivers/iio/accel/bma400_i2c.c +++ b/drivers/iio/accel/bma400_i2c.c @@ -24,7 +24,7 @@ static int bma400_i2c_probe(struct i2c_client *client, return PTR_ERR(regmap); } - return bma400_probe(&client->dev, regmap, id->name); + return bma400_probe(&client->dev, regmap, client->irq, id->name); } static const struct i2c_device_id bma400_i2c_ids[] = { diff --git a/drivers/iio/accel/bma400_spi.c b/drivers/iio/accel/bma400_spi.c index 28e240400a3f..ec13c044b304 100644 --- a/drivers/iio/accel/bma400_spi.c +++ b/drivers/iio/accel/bma400_spi.c @@ -84,7 +84,7 @@ static int bma400_spi_probe(struct spi_device *spi) if (ret) dev_err(&spi->dev, "Failed to read chip id register\n"); - return bma400_probe(&spi->dev, regmap, id->name); + return bma400_probe(&spi->dev, regmap, spi->irq, id->name); } static const struct spi_device_id bma400_spi_ids[] = {