[PATCH 2/7] iio: bmg160: Use i2c regmap instead of direct i2c access
From: Markus Pargmann
Date: Wed Jul 29 2015 - 09:47:42 EST
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>
#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");
goto 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,
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)
--
2.1.4
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/