Re: [PATCH 2/7] iio: bmg160: Use i2c regmap instead of direct i2c access

From: Markus Pargmann
Date: Sun Aug 02 2015 - 13:33:35 EST

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Hi,

On Fri, Jul 31, 2015 at 12:29:58PM -0700, Srinivas Pandruvada wrote:
> On Wed, 2015-07-29 at 15:46 +0200, Markus Pargmann wrote:
> > This patch introduces regmap usage into the driver. This is done to
> > later easily support the SPI interface of this chip.
> >
> > Signed-off-by: Markus Pargmann <mpa@xxxxxxxxxxxxxx>
> > ---
> > drivers/iio/gyro/bmg160.c | 200 +++++++++++++++++++++-------------------------
> > 1 file changed, 89 insertions(+), 111 deletions(-)
> >
> > diff --git a/drivers/iio/gyro/bmg160.c b/drivers/iio/gyro/bmg160.c
> > index 460bf715d541..626f5c98dde8 100644
> > --- a/drivers/iio/gyro/bmg160.c
> > +++ b/drivers/iio/gyro/bmg160.c
> > @@ -28,6 +28,7 @@
> > #include <linux/iio/events.h>
> > #include <linux/iio/trigger_consumer.h>
> > #include <linux/iio/triggered_buffer.h>
> > +#include <linux/regmap.h>
> Don't we need "select REGMAP_I2C" in Kconfig?

Oh yes. This is wrongly introduced in Patch 6/7. But it should really be
in this one.

Thanks,

Markus

> Changes looks fine. But there are many changes, so we need to test this
> on i2c before taking this patch.
>
> Thanks,
> Srinivas
>
> >
> > #define BMG160_DRV_NAME "bmg160"
> > #define BMG160_IRQ_NAME "bmg160_event"
> > @@ -98,6 +99,7 @@
> >
> > struct bmg160_data {
> > struct i2c_client *client;
> > + struct regmap *regmap;
> > struct iio_trigger *dready_trig;
> > struct iio_trigger *motion_trig;
> > struct mutex mutex;
> > @@ -134,12 +136,19 @@ static const struct {
> > { 133, BMG160_RANGE_250DPS},
> > { 66, BMG160_RANGE_125DPS} };
> >
> > +struct regmap_config bmg160_regmap_i2c_conf = {
> > + .reg_bits = 8,
> > + .val_bits = 8,
> > +
> > + .use_single_rw = true,
> > + .cache_type = REGCACHE_NONE,
> > +};
> > +
> > static int bmg160_set_mode(struct bmg160_data *data, u8 mode)
> > {
> > int ret;
> >
> > - ret = i2c_smbus_write_byte_data(data->client,
> > - BMG160_REG_PMU_LPW, mode);
> > + ret = regmap_write(data->regmap, BMG160_REG_PMU_LPW, mode);
> > if (ret < 0) {
> > dev_err(&data->client->dev, "Error writing reg_pmu_lpw\n");
> > return ret;
> > @@ -169,8 +178,7 @@ static int bmg160_set_bw(struct bmg160_data *data, int val)
> > if (bw_bits < 0)
> > return bw_bits;
> >
> > - ret = i2c_smbus_write_byte_data(data->client, BMG160_REG_PMU_BW,
> > - bw_bits);
> > + ret = regmap_write(data->regmap, BMG160_REG_PMU_BW, bw_bits);
> > if (ret < 0) {
> > dev_err(&data->client->dev, "Error writing reg_pmu_bw\n");
> > return ret;
> > @@ -184,16 +192,17 @@ static int bmg160_set_bw(struct bmg160_data *data, int val)
> > static int bmg160_chip_init(struct bmg160_data *data)
> > {
> > int ret;
> > + unsigned int val;
> >
> > - ret = i2c_smbus_read_byte_data(data->client, BMG160_REG_CHIP_ID);
> > + ret = regmap_read(data->regmap, BMG160_REG_CHIP_ID, &val);
> > if (ret < 0) {
> > dev_err(&data->client->dev, "Error reading reg_chip_id\n");
> > return ret;
> > }
> >
> > - dev_dbg(&data->client->dev, "Chip Id %x\n", ret);
> > - if (ret != BMG160_CHIP_ID_VAL) {
> > - dev_err(&data->client->dev, "invalid chip %x\n", ret);
> > + dev_dbg(&data->client->dev, "Chip Id %x\n", val);
> > + if (val != BMG160_CHIP_ID_VAL) {
> > + dev_err(&data->client->dev, "invalid chip %x\n", val);
> > return -ENODEV;
> > }
> >
> > @@ -210,40 +219,31 @@ static int bmg160_chip_init(struct bmg160_data *data)
> > return ret;
> >
> > /* Set Default Range */
> > - ret = i2c_smbus_write_byte_data(data->client,
> > - BMG160_REG_RANGE,
> > - BMG160_RANGE_500DPS);
> > + ret = regmap_write(data->regmap, BMG160_REG_RANGE, BMG160_RANGE_500DPS);
> > if (ret < 0) {
> > dev_err(&data->client->dev, "Error writing reg_range\n");
> > return ret;
> > }
> > data->dps_range = BMG160_RANGE_500DPS;
> >
> > - ret = i2c_smbus_read_byte_data(data->client, BMG160_REG_SLOPE_THRES);
> > + ret = regmap_read(data->regmap, BMG160_REG_SLOPE_THRES, &val);
> > if (ret < 0) {
> > dev_err(&data->client->dev, "Error reading reg_slope_thres\n");
> > return ret;
> > }
> > - data->slope_thres = ret;
> > + data->slope_thres = val;
> >
> > /* Set default interrupt mode */
> > - ret = i2c_smbus_read_byte_data(data->client, BMG160_REG_INT_EN_1);
> > - if (ret < 0) {
> > - dev_err(&data->client->dev, "Error reading reg_int_en_1\n");
> > - return ret;
> > - }
> > - ret &= ~BMG160_INT1_BIT_OD;
> > - ret = i2c_smbus_write_byte_data(data->client,
> > - BMG160_REG_INT_EN_1, ret);
> > + ret = regmap_update_bits(data->regmap, BMG160_REG_INT_EN_1,
> > + BMG160_INT1_BIT_OD, 0);
> > if (ret < 0) {
> > - dev_err(&data->client->dev, "Error writing reg_int_en_1\n");
> > + dev_err(&data->client->dev, "Error updating bits in reg_int_en_1\n");
> > return ret;
> > }
> >
> > - ret = i2c_smbus_write_byte_data(data->client,
> > - BMG160_REG_INT_RST_LATCH,
> > - BMG160_INT_MODE_LATCH_INT |
> > - BMG160_INT_MODE_LATCH_RESET);
> > + ret = regmap_write(data->regmap, BMG160_REG_INT_RST_LATCH,
> > + BMG160_INT_MODE_LATCH_INT |
> > + BMG160_INT_MODE_LATCH_RESET);
> > if (ret < 0) {
> > dev_err(&data->client->dev,
> > "Error writing reg_motion_intr\n");
> > @@ -284,41 +284,28 @@ static int bmg160_setup_any_motion_interrupt(struct bmg160_data *data,
> > int ret;
> >
> > /* Enable/Disable INT_MAP0 mapping */
> > - ret = i2c_smbus_read_byte_data(data->client, BMG160_REG_INT_MAP_0);
> > - if (ret < 0) {
> > - dev_err(&data->client->dev, "Error reading reg_int_map0\n");
> > - return ret;
> > - }
> > - if (status)
> > - ret |= BMG160_INT_MAP_0_BIT_ANY;
> > - else
> > - ret &= ~BMG160_INT_MAP_0_BIT_ANY;
> > -
> > - ret = i2c_smbus_write_byte_data(data->client,
> > - BMG160_REG_INT_MAP_0,
> > - ret);
> > + ret = regmap_update_bits(data->regmap, BMG160_REG_INT_MAP_0,
> > + BMG160_INT_MAP_0_BIT_ANY,
> > + (status ? BMG160_INT_MAP_0_BIT_ANY : 0));
> > if (ret < 0) {
> > - dev_err(&data->client->dev, "Error writing reg_int_map0\n");
> > + dev_err(&data->client->dev, "Error updating bits reg_int_map0\n");
> > return ret;
> > }
> >
> > /* Enable/Disable slope interrupts */
> > if (status) {
> > /* Update slope thres */
> > - ret = i2c_smbus_write_byte_data(data->client,
> > - BMG160_REG_SLOPE_THRES,
> > - data->slope_thres);
> > + ret = regmap_write(data->regmap, BMG160_REG_SLOPE_THRES,
> > + data->slope_thres);
> > if (ret < 0) {
> > dev_err(&data->client->dev,
> > "Error writing reg_slope_thres\n");
> > return ret;
> > }
> >
> > - ret = i2c_smbus_write_byte_data(data->client,
> > - BMG160_REG_MOTION_INTR,
> > - BMG160_INT_MOTION_X |
> > - BMG160_INT_MOTION_Y |
> > - BMG160_INT_MOTION_Z);
> > + ret = regmap_write(data->regmap, BMG160_REG_MOTION_INTR,
> > + BMG160_INT_MOTION_X | BMG160_INT_MOTION_Y |
> > + BMG160_INT_MOTION_Z);
> > if (ret < 0) {
> > dev_err(&data->client->dev,
> > "Error writing reg_motion_intr\n");
> > @@ -331,10 +318,10 @@ static int bmg160_setup_any_motion_interrupt(struct bmg160_data *data,
> > * to set latched mode, we will be flooded anyway with INTR
> > */
> > if (!data->dready_trigger_on) {
> > - ret = i2c_smbus_write_byte_data(data->client,
> > - BMG160_REG_INT_RST_LATCH,
> > - BMG160_INT_MODE_LATCH_INT |
> > - BMG160_INT_MODE_LATCH_RESET);
> > + ret = regmap_write(data->regmap,
> > + BMG160_REG_INT_RST_LATCH,
> > + BMG160_INT_MODE_LATCH_INT |
> > + BMG160_INT_MODE_LATCH_RESET);
> > if (ret < 0) {
> > dev_err(&data->client->dev,
> > "Error writing reg_rst_latch\n");
> > @@ -342,14 +329,12 @@ static int bmg160_setup_any_motion_interrupt(struct bmg160_data *data,
> > }
> > }
> >
> > - ret = i2c_smbus_write_byte_data(data->client,
> > - BMG160_REG_INT_EN_0,
> > - BMG160_DATA_ENABLE_INT);
> > + ret = regmap_write(data->regmap, BMG160_REG_INT_EN_0,
> > + BMG160_DATA_ENABLE_INT);
> >
> > - } else
> > - ret = i2c_smbus_write_byte_data(data->client,
> > - BMG160_REG_INT_EN_0,
> > - 0);
> > + } else {
> > + ret = regmap_write(data->regmap, BMG160_REG_INT_EN_0, 0);
> > + }
> >
> > if (ret < 0) {
> > dev_err(&data->client->dev, "Error writing reg_int_en0\n");
> > @@ -365,55 +350,39 @@ static int bmg160_setup_new_data_interrupt(struct bmg160_data *data,
> > int ret;
> >
> > /* Enable/Disable INT_MAP1 mapping */
> > - ret = i2c_smbus_read_byte_data(data->client, BMG160_REG_INT_MAP_1);
> > - if (ret < 0) {
> > - dev_err(&data->client->dev, "Error reading reg_int_map1\n");
> > - return ret;
> > - }
> > -
> > - if (status)
> > - ret |= BMG160_INT_MAP_1_BIT_NEW_DATA;
> > - else
> > - ret &= ~BMG160_INT_MAP_1_BIT_NEW_DATA;
> > -
> > - ret = i2c_smbus_write_byte_data(data->client,
> > - BMG160_REG_INT_MAP_1,
> > - ret);
> > + ret = regmap_update_bits(data->regmap, BMG160_REG_INT_MAP_1,
> > + BMG160_INT_MAP_1_BIT_NEW_DATA,
> > + (status ? BMG160_INT_MAP_1_BIT_NEW_DATA : 0));
> > if (ret < 0) {
> > - dev_err(&data->client->dev, "Error writing reg_int_map1\n");
> > + dev_err(&data->client->dev, "Error updating bits in reg_int_map1\n");
> > return ret;
> > }
> >
> > if (status) {
> > - ret = i2c_smbus_write_byte_data(data->client,
> > - BMG160_REG_INT_RST_LATCH,
> > - BMG160_INT_MODE_NON_LATCH_INT |
> > - BMG160_INT_MODE_LATCH_RESET);
> > + ret = regmap_write(data->regmap, BMG160_REG_INT_RST_LATCH,
> > + BMG160_INT_MODE_NON_LATCH_INT |
> > + BMG160_INT_MODE_LATCH_RESET);
> > if (ret < 0) {
> > dev_err(&data->client->dev,
> > "Error writing reg_rst_latch\n");
> > return ret;
> > }
> >
> > - ret = i2c_smbus_write_byte_data(data->client,
> > - BMG160_REG_INT_EN_0,
> > - BMG160_DATA_ENABLE_INT);
> > + ret = regmap_write(data->regmap, BMG160_REG_INT_EN_0,
> > + BMG160_DATA_ENABLE_INT);
> >
> > } else {
> > /* Restore interrupt mode */
> > - ret = i2c_smbus_write_byte_data(data->client,
> > - BMG160_REG_INT_RST_LATCH,
> > - BMG160_INT_MODE_LATCH_INT |
> > - BMG160_INT_MODE_LATCH_RESET);
> > + ret = regmap_write(data->regmap, BMG160_REG_INT_RST_LATCH,
> > + BMG160_INT_MODE_LATCH_INT |
> > + BMG160_INT_MODE_LATCH_RESET);
> > if (ret < 0) {
> > dev_err(&data->client->dev,
> > "Error writing reg_rst_latch\n");
> > return ret;
> > }
> >
> > - ret = i2c_smbus_write_byte_data(data->client,
> > - BMG160_REG_INT_EN_0,
> > - 0);
> > + ret = regmap_write(data->regmap, BMG160_REG_INT_EN_0, 0);
> > }
> >
> > if (ret < 0) {
> > @@ -444,10 +413,8 @@ static int bmg160_set_scale(struct bmg160_data *data, int val)
> >
> > for (i = 0; i < ARRAY_SIZE(bmg160_scale_table); ++i) {
> > if (bmg160_scale_table[i].scale == val) {
> > - ret = i2c_smbus_write_byte_data(
> > - data->client,
> > - BMG160_REG_RANGE,
> > - bmg160_scale_table[i].dps_range);
> > + ret = regmap_write(data->regmap, BMG160_REG_RANGE,
> > + bmg160_scale_table[i].dps_range);
> > if (ret < 0) {
> > dev_err(&data->client->dev,
> > "Error writing reg_range\n");
> > @@ -464,6 +431,7 @@ static int bmg160_set_scale(struct bmg160_data *data, int val)
> > static int bmg160_get_temp(struct bmg160_data *data, int *val)
> > {
> > int ret;
> > + unsigned int raw_val;
> >
> > mutex_lock(&data->mutex);
> > ret = bmg160_set_power_state(data, true);
> > @@ -472,7 +440,7 @@ static int bmg160_get_temp(struct bmg160_data *data, int *val)
> > return ret;
> > }
> >
> > - ret = i2c_smbus_read_byte_data(data->client, BMG160_REG_TEMP);
> > + ret = regmap_read(data->regmap, BMG160_REG_TEMP, &raw_val);
> > if (ret < 0) {
> > dev_err(&data->client->dev, "Error reading reg_temp\n");
> > bmg160_set_power_state(data, false);
> > @@ -480,7 +448,7 @@ static int bmg160_get_temp(struct bmg160_data *data, int *val)
> > return ret;
> > }
> >
> > - *val = sign_extend32(ret, 7);
> > + *val = sign_extend32(raw_val, 7);
> > ret = bmg160_set_power_state(data, false);
> > mutex_unlock(&data->mutex);
> > if (ret < 0)
> > @@ -492,6 +460,7 @@ static int bmg160_get_temp(struct bmg160_data *data, int *val)
> > static int bmg160_get_axis(struct bmg160_data *data, int axis, int *val)
> > {
> > int ret;
> > + unsigned int raw_val;
> >
> > mutex_lock(&data->mutex);
> > ret = bmg160_set_power_state(data, true);
> > @@ -500,7 +469,8 @@ static int bmg160_get_axis(struct bmg160_data *data, int axis, int *val)
> > return ret;
> > }
> >
> > - ret = i2c_smbus_read_word_data(data->client, BMG160_AXIS_TO_REG(axis));
> > + ret = regmap_bulk_read(data->regmap, BMG160_AXIS_TO_REG(axis), &raw_val,
> > + 2);
> > if (ret < 0) {
> > dev_err(&data->client->dev, "Error reading axis %d\n", axis);
> > bmg160_set_power_state(data, false);
> > @@ -508,7 +478,7 @@ static int bmg160_get_axis(struct bmg160_data *data, int axis, int *val)
> > return ret;
> > }
> >
> > - *val = sign_extend32(ret, 15);
> > + *val = sign_extend32(raw_val, 15);
> > ret = bmg160_set_power_state(data, false);
> > mutex_unlock(&data->mutex);
> > if (ret < 0)
> > @@ -807,12 +777,13 @@ static irqreturn_t bmg160_trigger_handler(int irq, void *p)
> > struct iio_dev *indio_dev = pf->indio_dev;
> > struct bmg160_data *data = iio_priv(indio_dev);
> > int bit, ret, i = 0;
> > + unsigned int 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,
> > - BMG160_AXIS_TO_REG(bit));
> > + ret = regmap_bulk_read(data->regmap, BMG160_AXIS_TO_REG(bit),
> > + &val, 2);
> > if (ret < 0) {
> > mutex_unlock(&data->mutex);
> > goto err;
> > @@ -840,10 +811,9 @@ static int bmg160_trig_try_reen(struct iio_trigger *trig)
> > return 0;
> >
> > /* Set latched mode interrupt and clear any latched interrupt */
> > - ret = i2c_smbus_write_byte_data(data->client,
> > - BMG160_REG_INT_RST_LATCH,
> > - BMG160_INT_MODE_LATCH_INT |
> > - BMG160_INT_MODE_LATCH_RESET);
> > + ret = regmap_write(data->regmap, BMG160_REG_INT_RST_LATCH,
> > + BMG160_INT_MODE_LATCH_INT |
> > + BMG160_INT_MODE_LATCH_RESET);
> > if (ret < 0) {
> > dev_err(&data->client->dev, "Error writing reg_rst_latch\n");
> > return ret;
> > @@ -907,33 +877,34 @@ static irqreturn_t bmg160_event_handler(int irq, void *private)
> > struct bmg160_data *data = iio_priv(indio_dev);
> > int ret;
> > int dir;
> > + unsigned int val;
> >
> > - ret = i2c_smbus_read_byte_data(data->client, BMG160_REG_INT_STATUS_2);
> > + ret = regmap_read(data->regmap, BMG160_REG_INT_STATUS_2, &val);
> > if (ret < 0) {
> > dev_err(&data->client->dev, "Error reading reg_int_status2\n");
> > gCONFIG_oto ack_intr_status;
> > }
> >
> > - if (ret & 0x08)
> > + if (val & 0x08)
> > dir = IIO_EV_DIR_RISING;
> > else
> > dir = IIO_EV_DIR_FALLING;
> >
> > - if (ret & BMG160_ANY_MOTION_BIT_X)
> > + if (val & BMG160_ANY_MOTION_BIT_X)
> > iio_push_event(indio_dev, IIO_MOD_EVENT_CODE(IIO_ANGL_VEL,
> > 0,
> > IIO_MOD_X,
> > IIO_EV_TYPE_ROC,
> > dir),
> > iio_get_time_ns());
> > - if (ret & BMG160_ANY_MOTION_BIT_Y)
> > + if (val & BMG160_ANY_MOTION_BIT_Y)
> > iio_push_event(indio_dev, IIO_MOD_EVENT_CODE(IIO_ANGL_VEL,
> > 0,
> > IIO_MOD_Y,
> > IIO_EV_TYPE_ROC,
> > CONFIG_ dir),
> > iio_get_time_ns());
> > - if (ret & BMG160_ANY_MOTION_BIT_Z)
> > + if (val & BMG160_ANY_MOTION_BIT_Z)
> > iio_push_event(indio_dev, IIO_MOD_EVENT_CODE(IIO_ANGL_VEL,
> > 0,
> > IIO_MOD_Z,
> > @@ -943,10 +914,9 @@ static irqreturn_t bmg160_event_handler(int irq, void *private)
> >
> > ack_intr_status:
> > if (!data->dready_trigger_on) {
> > - ret = i2c_smbus_write_byte_data(data->client,
> > - BMG160_REG_INT_RST_LATCH,
> > - BMG160_INT_MODE_LATCH_INT |
> > - BMG160_INT_MODE_LATCH_RESET);
> > + ret = regmap_write(data->regmap, BMG160_REG_INT_RST_LATCH,
> > + BMG160_INT_MODE_LATCH_INT |
> > + BMG160_INT_MODE_LATCH_RESET);
> > if (ret < 0)
> > dev_err(&data->client->dev,
> > "Error writing reg_rst_latch\n");
> > @@ -1038,6 +1008,14 @@ static int bmg160_probe(struct i2c_client *client,
> > struct iio_dev *indio_dev;
> > int ret;
> > const char *name = NULL;
> > + struct regmap *regmap;
> > +
> > + regmap = devm_regmap_init_i2c(client, &bmg160_regmap_i2c_conf);
> > + if (IS_ERR(regmap)) {
> > + dev_err(&client->dev, "Failed to register i2c regmap %d\n",
> > + (int)PTR_ERR(regmap));
> > + return PTR_ERR(regmap);
> > + }
> >
> > indio_dev = devm_iio_device_alloc(&client->dev, sizeof(*data));
> > if (!indio_dev)
>
>
>

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