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Date: Wed, 23 Sep 2015 12:47:14 +0000
From: "Tirdea, Irina" <irina.tirdea@...el.com>
To: Markus Pargmann <mpa@...gutronix.de>,
Jonathan Cameron <jic23@...nel.org>
CC: Srinivas Pandruvada <srinivas.pandruvada@...ux.intel.com>,
"Lars-Peter Clausen" <lars@...afoo.de>,
"linux-iio@...r.kernel.org" <linux-iio@...r.kernel.org>,
"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
"kernel@...gutronix.de" <kernel@...gutronix.de>
Subject: RE: [PATCH v3 1/4] iio: bmc150: Use i2c regmap
> -----Original Message-----
> From: Markus Pargmann [mailto:mpa@...gutronix.de]
> Sent: 21 September, 2015 13:55
> To: Jonathan Cameron
> Cc: Srinivas Pandruvada; Tirdea, Irina; Lars-Peter Clausen; linux-iio@...r.kernel.org; linux-kernel@...r.kernel.org;
> kernel@...gutronix.de; Markus Pargmann
> Subject: [PATCH v3 1/4] iio: bmc150: Use i2c regmap
>
> This replaces all usage of direct i2c accesses with regmap accesses.
>
> Signed-off-by: Markus Pargmann <mpa@...gutronix.de>
Tested-by: Irina Tirdea <irina.tirdea@...el.com>
> ---
> drivers/iio/accel/Kconfig | 2 +
> drivers/iio/accel/bmc150-accel.c | 225 +++++++++++++++++----------------------
> 2 files changed, 99 insertions(+), 128 deletions(-)
>
> diff --git a/drivers/iio/accel/Kconfig b/drivers/iio/accel/Kconfig
> index a59047d7657e..3ff2c83f7492 100644
> --- a/drivers/iio/accel/Kconfig
> +++ b/drivers/iio/accel/Kconfig
> @@ -22,6 +22,8 @@ config BMC150_ACCEL
> depends on I2C
> select IIO_BUFFER
> select IIO_TRIGGERED_BUFFER
> + select REGMAP
> + select REGMAP_I2C
> help
> Say yes here to build support for the following Bosch accelerometers:
> BMC150, BMI055, BMA250E, BMA222E, BMA255, BMA280.
> diff --git a/drivers/iio/accel/bmc150-accel.c b/drivers/iio/accel/bmc150-accel.c
> index 0104cdef8709..a17034fd53fb 100644
> --- a/drivers/iio/accel/bmc150-accel.c
> +++ b/drivers/iio/accel/bmc150-accel.c
> @@ -35,6 +35,7 @@
> #include <linux/iio/trigger.h>
> #include <linux/iio/trigger_consumer.h>
> #include <linux/iio/triggered_buffer.h>
> +#include <linux/regmap.h>
>
> #define BMC150_ACCEL_DRV_NAME "bmc150_accel"
> #define BMC150_ACCEL_IRQ_NAME "bmc150_accel_event"
> @@ -186,6 +187,8 @@ enum bmc150_accel_trigger_id {
>
> struct bmc150_accel_data {
> struct i2c_client *client;
> + struct regmap *regmap;
> + struct device *dev;
> struct bmc150_accel_interrupt interrupts[BMC150_ACCEL_INTERRUPTS];
> atomic_t active_intr;
> struct bmc150_accel_trigger triggers[BMC150_ACCEL_TRIGGERS];
> @@ -242,6 +245,12 @@ static const struct {
> {500000, BMC150_ACCEL_SLEEP_500_MS},
> {1000000, BMC150_ACCEL_SLEEP_1_SEC} };
>
> +static const struct regmap_config bmc150_i2c_regmap_conf = {
> + .reg_bits = 8,
> + .val_bits = 8,
> + .max_register = 0x3f,
> +};
> +
> static int bmc150_accel_set_mode(struct bmc150_accel_data *data,
> enum bmc150_power_modes mode,
> int dur_us)
> @@ -271,8 +280,7 @@ static int bmc150_accel_set_mode(struct bmc150_accel_data *data,
>
> dev_dbg(&data->client->dev, "Set Mode bits %x\n", lpw_bits);
>
> - ret = i2c_smbus_write_byte_data(data->client,
> - BMC150_ACCEL_REG_PMU_LPW, lpw_bits);
> + ret = regmap_write(data->regmap, BMC150_ACCEL_REG_PMU_LPW, lpw_bits);
> if (ret < 0) {
> dev_err(&data->client->dev, "Error writing reg_pmu_lpw\n");
> return ret;
> @@ -290,8 +298,7 @@ static int bmc150_accel_set_bw(struct bmc150_accel_data *data, int val,
> for (i = 0; i < ARRAY_SIZE(bmc150_accel_samp_freq_table); ++i) {
> if (bmc150_accel_samp_freq_table[i].val == val &&
> bmc150_accel_samp_freq_table[i].val2 == val2) {
> - ret = i2c_smbus_write_byte_data(
> - data->client,
> + ret = regmap_write(data->regmap,
> BMC150_ACCEL_REG_PMU_BW,
> bmc150_accel_samp_freq_table[i].bw_bits);
> if (ret < 0)
> @@ -308,26 +315,19 @@ static int bmc150_accel_set_bw(struct bmc150_accel_data *data, int val,
>
> static int bmc150_accel_update_slope(struct bmc150_accel_data *data)
> {
> - int ret, val;
> + int ret;
>
> - ret = i2c_smbus_write_byte_data(data->client, BMC150_ACCEL_REG_INT_6,
> + ret = regmap_write(data->regmap, BMC150_ACCEL_REG_INT_6,
> data->slope_thres);
> if (ret < 0) {
> dev_err(&data->client->dev, "Error writing reg_int_6\n");
> return ret;
> }
>
> - ret = i2c_smbus_read_byte_data(data->client, BMC150_ACCEL_REG_INT_5);
> + ret = regmap_update_bits(data->regmap, BMC150_ACCEL_REG_INT_5,
> + BMC150_ACCEL_SLOPE_DUR_MASK, data->slope_dur);
> if (ret < 0) {
> - dev_err(&data->client->dev, "Error reading reg_int_5\n");
> - return ret;
> - }
> -
> - val = (ret & ~BMC150_ACCEL_SLOPE_DUR_MASK) | data->slope_dur;
> - ret = i2c_smbus_write_byte_data(data->client, BMC150_ACCEL_REG_INT_5,
> - val);
> - if (ret < 0) {
> - dev_err(&data->client->dev, "Error write reg_int_5\n");
> + dev_err(&data->client->dev, "Error updating reg_int_5\n");
> return ret;
> }
>
> @@ -470,38 +470,18 @@ static int bmc150_accel_set_interrupt(struct bmc150_accel_data *data, int i,
> return ret;
>
> /* map the interrupt to the appropriate pins */
> - ret = i2c_smbus_read_byte_data(data->client, info->map_reg);
> - if (ret < 0) {
> - dev_err(&data->client->dev, "Error reading reg_int_map\n");
> - goto out_fix_power_state;
> - }
> - if (state)
> - ret |= info->map_bitmask;
> - else
> - ret &= ~info->map_bitmask;
> -
> - ret = i2c_smbus_write_byte_data(data->client, info->map_reg,
> - ret);
> + ret = regmap_update_bits(data->regmap, info->map_reg, info->map_bitmask,
> + (state ? info->map_bitmask : 0));
> if (ret < 0) {
> - dev_err(&data->client->dev, "Error writing reg_int_map\n");
> + dev_err(&data->client->dev, "Error updating reg_int_map\n");
> goto out_fix_power_state;
> }
>
> /* enable/disable the interrupt */
> - ret = i2c_smbus_read_byte_data(data->client, info->en_reg);
> + ret = regmap_update_bits(data->regmap, info->en_reg, info->en_bitmask,
> + (state ? info->en_bitmask : 0));
> if (ret < 0) {
> - dev_err(&data->client->dev, "Error reading reg_int_en\n");
> - goto out_fix_power_state;
> - }
> -
> - if (state)
> - ret |= info->en_bitmask;
> - else
> - ret &= ~info->en_bitmask;
> -
> - ret = i2c_smbus_write_byte_data(data->client, info->en_reg, ret);
> - if (ret < 0) {
> - dev_err(&data->client->dev, "Error writing reg_int_en\n");
> + dev_err(&data->client->dev, "Error updating reg_int_en\n");
> goto out_fix_power_state;
> }
>
> @@ -523,8 +503,7 @@ static int bmc150_accel_set_scale(struct bmc150_accel_data *data, int val)
>
> for (i = 0; i < ARRAY_SIZE(data->chip_info->scale_table); ++i) {
> if (data->chip_info->scale_table[i].scale == val) {
> - ret = i2c_smbus_write_byte_data(
> - data->client,
> + ret = regmap_write(data->regmap,
> BMC150_ACCEL_REG_PMU_RANGE,
> data->chip_info->scale_table[i].reg_range);
> if (ret < 0) {
> @@ -544,16 +523,17 @@ static int bmc150_accel_set_scale(struct bmc150_accel_data *data, int val)
> static int bmc150_accel_get_temp(struct bmc150_accel_data *data, int *val)
> {
> int ret;
> + unsigned int value;
>
> mutex_lock(&data->mutex);
>
> - ret = i2c_smbus_read_byte_data(data->client, BMC150_ACCEL_REG_TEMP);
> + ret = regmap_read(data->regmap, BMC150_ACCEL_REG_TEMP, &value);
> if (ret < 0) {
> dev_err(&data->client->dev, "Error reading reg_temp\n");
> mutex_unlock(&data->mutex);
> return ret;
> }
> - *val = sign_extend32(ret, 7);
> + *val = sign_extend32(value, 7);
>
> mutex_unlock(&data->mutex);
>
> @@ -566,6 +546,7 @@ static int bmc150_accel_get_axis(struct bmc150_accel_data *data,
> {
> int ret;
> int axis = chan->scan_index;
> + unsigned int raw_val;
>
> mutex_lock(&data->mutex);
> ret = bmc150_accel_set_power_state(data, true);
> @@ -574,15 +555,15 @@ static int bmc150_accel_get_axis(struct bmc150_accel_data *data,
> return ret;
> }
>
> - ret = i2c_smbus_read_word_data(data->client,
> - BMC150_ACCEL_AXIS_TO_REG(axis));
> + ret = regmap_bulk_read(data->regmap, BMC150_ACCEL_AXIS_TO_REG(axis),
> + &raw_val, 2);
> if (ret < 0) {
> dev_err(&data->client->dev, "Error reading axis %d\n", axis);
> bmc150_accel_set_power_state(data, false);
> mutex_unlock(&data->mutex);
> return ret;
> }
> - *val = sign_extend32(ret >> chan->scan_type.shift,
> + *val = sign_extend32(raw_val >> chan->scan_type.shift,
> chan->scan_type.realbits - 1);
> ret = bmc150_accel_set_power_state(data, false);
> mutex_unlock(&data->mutex);
> @@ -846,52 +827,34 @@ static int bmc150_accel_set_watermark(struct iio_dev *indio_dev, unsigned val)
> * We must read at least one full frame in one burst, otherwise the rest of the
> * frame data is discarded.
> */
> -static int bmc150_accel_fifo_transfer(const struct i2c_client *client,
> +static int bmc150_accel_fifo_transfer(struct bmc150_accel_data *data,
> char *buffer, int samples)
> {
> int sample_length = 3 * 2;
> - u8 reg_fifo_data = BMC150_ACCEL_REG_FIFO_DATA;
> - int ret = -EIO;
> -
> - if (i2c_check_functionality(client->adapter, I2C_FUNC_I2C)) {
> - struct i2c_msg msg[2] = {
> - {
> - .addr = client->addr,
> - .flags = 0,
> - .buf = ®_fifo_data,
> - .len = sizeof(reg_fifo_data),
> - },
> - {
> - .addr = client->addr,
> - .flags = I2C_M_RD,
> - .buf = (u8 *)buffer,
> - .len = samples * sample_length,
> - }
> - };
> + int ret;
> + int total_length = samples * sample_length;
> + int i;
> + size_t step = regmap_get_raw_read_max(data->regmap);
>
> - ret = i2c_transfer(client->adapter, msg, 2);
> - if (ret != 2)
> - ret = -EIO;
> - else
> - ret = 0;
> - } else {
> - int i, step = I2C_SMBUS_BLOCK_MAX / sample_length;
> -
> - for (i = 0; i < samples * sample_length; i += step) {
> - ret = i2c_smbus_read_i2c_block_data(client,
> - reg_fifo_data, step,
> - &buffer[i]);
> - if (ret != step) {
> - ret = -EIO;
> - break;
> - }
> + if (!step || step > total_length)
> + step = total_length;
> + else if (step < total_length)
> + step = sample_length;
>
> - ret = 0;
> - }
> + /*
> + * Seems we have a bus with size limitation so we have to execute
> + * multiple reads
> + */
> + for (i = 0; i < total_length; i += step) {
> + ret = regmap_raw_read(data->regmap, BMC150_ACCEL_REG_FIFO_DATA,
> + &buffer[i], step);
> + if (ret)
> + break;
> }
>
> if (ret)
> - dev_err(&client->dev, "Error transferring data from fifo\n");
> + dev_err(data->dev, "Error transferring data from fifo in single steps of %zu\n",
> + step);
>
> return ret;
> }
> @@ -905,15 +868,15 @@ static int __bmc150_accel_fifo_flush(struct iio_dev *indio_dev,
> u16 buffer[BMC150_ACCEL_FIFO_LENGTH * 3];
> int64_t tstamp;
> uint64_t sample_period;
> + unsigned int val;
>
> - ret = i2c_smbus_read_byte_data(data->client,
> - BMC150_ACCEL_REG_FIFO_STATUS);
> + ret = regmap_read(data->regmap, BMC150_ACCEL_REG_FIFO_STATUS, &val);
> if (ret < 0) {
> dev_err(&data->client->dev, "Error reading reg_fifo_status\n");
> return ret;
> }
>
> - count = ret & 0x7F;
> + count = val & 0x7F;
>
> if (!count)
> return 0;
> @@ -952,7 +915,7 @@ static int __bmc150_accel_fifo_flush(struct iio_dev *indio_dev,
> if (samples && count > samples)
> count = samples;
>
> - ret = bmc150_accel_fifo_transfer(data->client, (u8 *)buffer, count);
> + ret = bmc150_accel_fifo_transfer(data, (u8 *)buffer, count);
> if (ret)
> return ret;
>
> @@ -1155,17 +1118,19 @@ static irqreturn_t bmc150_accel_trigger_handler(int irq, void *p)
> struct iio_dev *indio_dev = pf->indio_dev;
> struct bmc150_accel_data *data = iio_priv(indio_dev);
> int bit, ret, i = 0;
> + unsigned int raw_val;
>
> mutex_lock(&data->mutex);
> for_each_set_bit(bit, indio_dev->active_scan_mask,
> indio_dev->masklength) {
> - ret = i2c_smbus_read_word_data(data->client,
> - BMC150_ACCEL_AXIS_TO_REG(bit));
> + ret = regmap_bulk_read(data->regmap,
> + BMC150_ACCEL_AXIS_TO_REG(bit), &raw_val,
> + 2);
> if (ret < 0) {
> mutex_unlock(&data->mutex);
> goto err_read;
> }
> - data->buffer[i++] = ret;
> + data->buffer[i++] = raw_val;
> }
> mutex_unlock(&data->mutex);
>
> @@ -1189,10 +1154,9 @@ static int bmc150_accel_trig_try_reen(struct iio_trigger *trig)
>
> mutex_lock(&data->mutex);
> /* clear any latched interrupt */
> - ret = i2c_smbus_write_byte_data(data->client,
> - BMC150_ACCEL_REG_INT_RST_LATCH,
> - BMC150_ACCEL_INT_MODE_LATCH_INT |
> - BMC150_ACCEL_INT_MODE_LATCH_RESET);
> + ret = regmap_write(data->regmap, BMC150_ACCEL_REG_INT_RST_LATCH,
> + BMC150_ACCEL_INT_MODE_LATCH_INT |
> + BMC150_ACCEL_INT_MODE_LATCH_RESET);
> mutex_unlock(&data->mutex);
> if (ret < 0) {
> dev_err(&data->client->dev,
> @@ -1249,20 +1213,20 @@ static int bmc150_accel_handle_roc_event(struct iio_dev *indio_dev)
> struct bmc150_accel_data *data = iio_priv(indio_dev);
> int dir;
> int ret;
> + unsigned int val;
>
> - ret = i2c_smbus_read_byte_data(data->client,
> - BMC150_ACCEL_REG_INT_STATUS_2);
> + ret = regmap_read(data->regmap, BMC150_ACCEL_REG_INT_STATUS_2, &val);
> if (ret < 0) {
> dev_err(&data->client->dev, "Error reading reg_int_status_2\n");
> return ret;
> }
>
> - if (ret & BMC150_ACCEL_ANY_MOTION_BIT_SIGN)
> + if (val & BMC150_ACCEL_ANY_MOTION_BIT_SIGN)
> dir = IIO_EV_DIR_FALLING;
> else
> dir = IIO_EV_DIR_RISING;
>
> - if (ret & BMC150_ACCEL_ANY_MOTION_BIT_X)
> + if (val & BMC150_ACCEL_ANY_MOTION_BIT_X)
> iio_push_event(indio_dev,
> IIO_MOD_EVENT_CODE(IIO_ACCEL,
> 0,
> @@ -1271,7 +1235,7 @@ static int bmc150_accel_handle_roc_event(struct iio_dev *indio_dev)
> dir),
> data->timestamp);
>
> - if (ret & BMC150_ACCEL_ANY_MOTION_BIT_Y)
> + if (val & BMC150_ACCEL_ANY_MOTION_BIT_Y)
> iio_push_event(indio_dev,
> IIO_MOD_EVENT_CODE(IIO_ACCEL,
> 0,
> @@ -1280,7 +1244,7 @@ static int bmc150_accel_handle_roc_event(struct iio_dev *indio_dev)
> dir),
> data->timestamp);
>
> - if (ret & BMC150_ACCEL_ANY_MOTION_BIT_Z)
> + if (val & BMC150_ACCEL_ANY_MOTION_BIT_Z)
> iio_push_event(indio_dev,
> IIO_MOD_EVENT_CODE(IIO_ACCEL,
> 0,
> @@ -1315,10 +1279,9 @@ static irqreturn_t bmc150_accel_irq_thread_handler(int irq, void *private)
> }
>
> if (ack) {
> - ret = i2c_smbus_write_byte_data(data->client,
> - BMC150_ACCEL_REG_INT_RST_LATCH,
> - BMC150_ACCEL_INT_MODE_LATCH_INT |
> - BMC150_ACCEL_INT_MODE_LATCH_RESET);
> + ret = regmap_write(data->regmap, BMC150_ACCEL_REG_INT_RST_LATCH,
> + BMC150_ACCEL_INT_MODE_LATCH_INT |
> + BMC150_ACCEL_INT_MODE_LATCH_RESET);
> if (ret)
> dev_err(&data->client->dev,
> "Error writing reg_int_rst_latch\n");
> @@ -1459,7 +1422,7 @@ static int bmc150_accel_fifo_set_mode(struct bmc150_accel_data *data)
> u8 reg = BMC150_ACCEL_REG_FIFO_CONFIG1;
> int ret;
>
> - ret = i2c_smbus_write_byte_data(data->client, reg, data->fifo_mode);
> + ret = regmap_write(data->regmap, reg, data->fifo_mode);
> if (ret < 0) {
> dev_err(&data->client->dev, "Error writing reg_fifo_config1\n");
> return ret;
> @@ -1468,9 +1431,8 @@ static int bmc150_accel_fifo_set_mode(struct bmc150_accel_data *data)
> if (!data->fifo_mode)
> return 0;
>
> - ret = i2c_smbus_write_byte_data(data->client,
> - BMC150_ACCEL_REG_FIFO_CONFIG0,
> - data->watermark);
> + ret = regmap_write(data->regmap, BMC150_ACCEL_REG_FIFO_CONFIG0,
> + data->watermark);
> if (ret < 0)
> dev_err(&data->client->dev, "Error writing reg_fifo_config0\n");
>
> @@ -1557,23 +1519,25 @@ static const struct iio_buffer_setup_ops bmc150_accel_buffer_ops = {
> static int bmc150_accel_chip_init(struct bmc150_accel_data *data)
> {
> int ret, i;
> + unsigned int val;
>
> - ret = i2c_smbus_read_byte_data(data->client, BMC150_ACCEL_REG_CHIP_ID);
> + ret = regmap_read(data->regmap, BMC150_ACCEL_REG_CHIP_ID, &val);
> if (ret < 0) {
> - dev_err(&data->client->dev, "Error: Reading chip id\n");
> + dev_err(&data->client->dev,
> + "Error: Reading chip id\n");
> return ret;
> }
>
> - dev_dbg(&data->client->dev, "Chip Id %x\n", ret);
> + dev_dbg(&data->client->dev, "Chip Id %x\n", val);
> for (i = 0; i < ARRAY_SIZE(bmc150_accel_chip_info_tbl); i++) {
> - if (bmc150_accel_chip_info_tbl[i].chip_id == ret) {
> + if (bmc150_accel_chip_info_tbl[i].chip_id == val) {
> data->chip_info = &bmc150_accel_chip_info_tbl[i];
> break;
> }
> }
>
> if (!data->chip_info) {
> - dev_err(&data->client->dev, "Unsupported chip %x\n", ret);
> + dev_err(&data->client->dev, "Invalid chip %x\n", val);
> return -ENODEV;
> }
>
> @@ -1587,11 +1551,11 @@ static int bmc150_accel_chip_init(struct bmc150_accel_data *data)
> return ret;
>
> /* Set Default Range */
> - ret = i2c_smbus_write_byte_data(data->client,
> - BMC150_ACCEL_REG_PMU_RANGE,
> - BMC150_ACCEL_DEF_RANGE_4G);
> + ret = regmap_write(data->regmap, BMC150_ACCEL_REG_PMU_RANGE,
> + BMC150_ACCEL_DEF_RANGE_4G);
> if (ret < 0) {
> - dev_err(&data->client->dev, "Error writing reg_pmu_range\n");
> + dev_err(&data->client->dev,
> + "Error writing reg_pmu_range\n");
> return ret;
> }
>
> @@ -1605,10 +1569,9 @@ static int bmc150_accel_chip_init(struct bmc150_accel_data *data)
> return ret;
>
> /* Set default as latched interrupts */
> - ret = i2c_smbus_write_byte_data(data->client,
> - BMC150_ACCEL_REG_INT_RST_LATCH,
> - BMC150_ACCEL_INT_MODE_LATCH_INT |
> - BMC150_ACCEL_INT_MODE_LATCH_RESET);
> + ret = regmap_write(data->regmap, BMC150_ACCEL_REG_INT_RST_LATCH,
> + BMC150_ACCEL_INT_MODE_LATCH_INT |
> + BMC150_ACCEL_INT_MODE_LATCH_RESET);
> if (ret < 0) {
> dev_err(&data->client->dev,
> "Error writing reg_int_rst_latch\n");
> @@ -1633,6 +1596,13 @@ static int bmc150_accel_probe(struct i2c_client *client,
> data = iio_priv(indio_dev);
> i2c_set_clientdata(client, indio_dev);
> data->client = client;
> + data->dev = &client->dev;
> +
> + data->regmap = devm_regmap_init_i2c(client, &bmc150_i2c_regmap_conf);
> + if (IS_ERR(data->regmap)) {
> + dev_err(&client->dev, "Failed to initialize i2c regmap\n");
> + return PTR_ERR(data->regmap);
> + }
>
> if (id)
> name = id->name;
> @@ -1679,9 +1649,8 @@ static int bmc150_accel_probe(struct i2c_client *client,
> * want to use latch mode when we can to prevent interrupt
> * flooding.
> */
> - ret = i2c_smbus_write_byte_data(data->client,
> - BMC150_ACCEL_REG_INT_RST_LATCH,
> - BMC150_ACCEL_INT_MODE_LATCH_RESET);
> + ret = regmap_write(data->regmap, BMC150_ACCEL_REG_INT_RST_LATCH,
> + BMC150_ACCEL_INT_MODE_LATCH_RESET);
> if (ret < 0) {
> dev_err(&data->client->dev, "Error writing reg_int_rst_latch\n");
> goto err_buffer_cleanup;
> --
> 2.5.1
--
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