This patch changes hmc5843.c to use regmap. This provides transparent caching to the code as well as abstraction necessary to add support for SPI-based hmc5983. Signed-off-by: Josef Gajdusek <atx@xxxxxxxx> --- drivers/staging/iio/magnetometer/Kconfig | 1 + drivers/staging/iio/magnetometer/hmc5843.c | 140 +++++++++++++++++++---------- 2 files changed, 96 insertions(+), 45 deletions(-) diff --git a/drivers/staging/iio/magnetometer/Kconfig b/drivers/staging/iio/magnetometer/Kconfig index 34634da..ad88d61 100644 --- a/drivers/staging/iio/magnetometer/Kconfig +++ b/drivers/staging/iio/magnetometer/Kconfig @@ -8,6 +8,7 @@ config SENSORS_HMC5843 depends on I2C select IIO_BUFFER select IIO_TRIGGERED_BUFFER + select REGMAP_I2C help Say Y here to add support for the Honeywell HMC5843, HMC5883 and HMC5883L 3-Axis Magnetometer (digital compass). diff --git a/drivers/staging/iio/magnetometer/hmc5843.c b/drivers/staging/iio/magnetometer/hmc5843.c index d4f4dd9..a458160 100644 --- a/drivers/staging/iio/magnetometer/hmc5843.c +++ b/drivers/staging/iio/magnetometer/hmc5843.c @@ -21,6 +21,7 @@ #include <linux/module.h> #include <linux/i2c.h> +#include <linux/regmap.h> #include <linux/iio/iio.h> #include <linux/iio/sysfs.h> #include <linux/iio/trigger_consumer.h> @@ -34,6 +35,7 @@ #define HMC5843_DATA_OUT_MSB_REGS 0x03 #define HMC5843_STATUS_REG 0x09 #define HMC5843_ID_REG 0x0a +#define HMC5843_ID_END 0x0c enum hmc5843_ids { HMC5843_ID, @@ -49,6 +51,7 @@ enum hmc5843_ids { #define HMC5843_RANGE_GAIN_OFFSET 0x05 #define HMC5843_RANGE_GAIN_DEFAULT 0x01 #define HMC5843_RANGE_GAINS 8 +#define HMC5843_RANGE_GAIN_MASK 0xe0 /* Device status */ #define HMC5843_DATA_READY 0x01 @@ -68,6 +71,7 @@ enum hmc5843_ids { #define HMC5843_RATE_OFFSET 0x02 #define HMC5843_RATE_DEFAULT 0x04 #define HMC5843_RATES 7 +#define HMC5843_RATE_MASK 0x1c /* Device measurement configuration */ #define HMC5843_MEAS_CONF_NORMAL 0x00 @@ -121,10 +125,7 @@ struct hmc5843_chip_info { struct hmc5843_data { struct i2c_client *client; struct mutex lock; - u8 rate; - u8 meas_conf; - u8 operating_mode; - u8 range; + struct regmap *regmap; const struct hmc5843_chip_info *variant; __be16 buffer[8]; /* 3x 16-bit channels + padding + 64-bit timestamp */ }; @@ -135,10 +136,8 @@ static s32 hmc5843_set_mode(struct hmc5843_data *data, u8 operating_mode) int ret; mutex_lock(&data->lock); - ret = i2c_smbus_write_byte_data(data->client, HMC5843_MODE_REG, - operating_mode & HMC5843_MODE_MASK); - if (ret >= 0) - data->operating_mode = operating_mode; + ret = regmap_update_bits(data->regmap, HMC5843_MODE_REG, + HMC5843_MODE_MASK, operating_mode); mutex_unlock(&data->lock); return ret; @@ -146,15 +145,15 @@ static s32 hmc5843_set_mode(struct hmc5843_data *data, u8 operating_mode) static int hmc5843_wait_measurement(struct hmc5843_data *data) { - s32 result; int tries = 150; + int val; + int ret; while (tries-- > 0) { - result = i2c_smbus_read_byte_data(data->client, - HMC5843_STATUS_REG); - if (result < 0) - return result; - if (result & HMC5843_DATA_READY) + ret = regmap_read(data->regmap, HMC5843_STATUS_REG, &val); + if (ret < 0) + return ret; + if (val & HMC5843_DATA_READY) break; msleep(20); } @@ -171,20 +170,20 @@ static int hmc5843_wait_measurement(struct hmc5843_data *data) static int hmc5843_read_measurement(struct hmc5843_data *data, int idx, int *val) { - s32 result; __be16 values[3]; + int ret; mutex_lock(&data->lock); - result = hmc5843_wait_measurement(data); - if (result < 0) { + ret = hmc5843_wait_measurement(data); + if (ret < 0) { mutex_unlock(&data->lock); - return result; + return ret; } - result = i2c_smbus_read_i2c_block_data(data->client, - HMC5843_DATA_OUT_MSB_REGS, sizeof(values), (u8 *) values); + ret = regmap_bulk_read(data->regmap, HMC5843_DATA_OUT_MSB_REGS, + values, sizeof(values)); mutex_unlock(&data->lock); - if (result < 0) - return -EINVAL; + if (ret < 0) + return ret; *val = sign_extend32(be16_to_cpu(values[idx]), 15); return IIO_VAL_INT; @@ -208,16 +207,13 @@ static int hmc5843_read_measurement(struct hmc5843_data *data, * and BN. * */ -static s32 hmc5843_set_meas_conf(struct hmc5843_data *data, u8 meas_conf) +static int hmc5843_set_meas_conf(struct hmc5843_data *data, u8 meas_conf) { int ret; mutex_lock(&data->lock); - ret = i2c_smbus_write_byte_data(data->client, HMC5843_CONFIG_REG_A, - (meas_conf & HMC5843_MEAS_CONF_MASK) | - (data->rate << HMC5843_RATE_OFFSET)); - if (ret >= 0) - data->meas_conf = meas_conf; + ret = regmap_update_bits(data->regmap, HMC5843_CONFIG_REG_A, + HMC5843_MEAS_CONF_MASK, meas_conf); mutex_unlock(&data->lock); return ret; @@ -228,7 +224,15 @@ static ssize_t hmc5843_show_measurement_configuration(struct device *dev, char *buf) { struct hmc5843_data *data = iio_priv(dev_to_iio_dev(dev)); - return sprintf(buf, "%d\n", data->meas_conf); + int val; + int ret; + + ret = regmap_read(data->regmap, HMC5843_CONFIG_REG_A, &val); + if (ret) + return ret; + val &= HMC5843_MEAS_CONF_MASK; + + return sprintf(buf, "%d\n", val); } static ssize_t hmc5843_set_measurement_configuration(struct device *dev, @@ -282,10 +286,8 @@ static int hmc5843_set_samp_freq(struct hmc5843_data *data, u8 rate) int ret; mutex_lock(&data->lock); - ret = i2c_smbus_write_byte_data(data->client, HMC5843_CONFIG_REG_A, - data->meas_conf | (rate << HMC5843_RATE_OFFSET)); - if (ret >= 0) - data->rate = rate; + ret = regmap_update_bits(data->regmap, HMC5843_CONFIG_REG_A, + HMC5843_RATE_MASK, rate << HMC5843_RATE_OFFSET); mutex_unlock(&data->lock); return ret; @@ -309,10 +311,9 @@ static int hmc5843_set_range_gain(struct hmc5843_data *data, u8 range) int ret; mutex_lock(&data->lock); - ret = i2c_smbus_write_byte_data(data->client, HMC5843_CONFIG_REG_B, - range << HMC5843_RANGE_GAIN_OFFSET); - if (ret >= 0) - data->range = range; + ret = regmap_update_bits(data->regmap, HMC5843_CONFIG_REG_B, + HMC5843_RANGE_GAIN_MASK, + range << HMC5843_RANGE_GAIN_OFFSET); mutex_unlock(&data->lock); return ret; @@ -358,17 +359,27 @@ static int hmc5843_read_raw(struct iio_dev *indio_dev, int *val, int *val2, long mask) { struct hmc5843_data *data = iio_priv(indio_dev); + int rval; + int ret; switch (mask) { case IIO_CHAN_INFO_RAW: return hmc5843_read_measurement(data, chan->scan_index, val); case IIO_CHAN_INFO_SCALE: + ret = regmap_read(data->regmap, HMC5843_CONFIG_REG_B, &rval); + if (ret < 0) + return ret; + rval >>= HMC5843_RANGE_GAIN_OFFSET; *val = 0; - *val2 = data->variant->regval_to_nanoscale[data->range]; + *val2 = data->variant->regval_to_nanoscale[rval]; return IIO_VAL_INT_PLUS_NANO; case IIO_CHAN_INFO_SAMP_FREQ: - *val = data->variant->regval_to_samp_freq[data->rate][0]; - *val2 = data->variant->regval_to_samp_freq[data->rate][1]; + ret = regmap_read(data->regmap, HMC5843_CONFIG_REG_A, &rval); + if (ret < 0) + return ret; + rval >>= HMC5843_RATE_OFFSET; + *val = data->variant->regval_to_samp_freq[rval][0]; + *val2 = data->variant->regval_to_samp_freq[rval][1]; return IIO_VAL_INT_PLUS_MICRO; } return -EINVAL; @@ -426,9 +437,9 @@ static irqreturn_t hmc5843_trigger_handler(int irq, void *p) goto done; } - ret = i2c_smbus_read_i2c_block_data(data->client, - HMC5843_DATA_OUT_MSB_REGS, 3 * sizeof(__be16), - (u8 *) data->buffer); + ret = regmap_bulk_read(data->regmap, HMC5843_DATA_OUT_MSB_REGS, + data->buffer, 3 * sizeof(__be16)); + mutex_unlock(&data->lock); if (ret < 0) goto done; @@ -508,8 +519,8 @@ static int hmc5843_init(struct hmc5843_data *data) int ret; u8 id[3]; - ret = i2c_smbus_read_i2c_block_data(data->client, HMC5843_ID_REG, - sizeof(id), id); + ret = regmap_bulk_read(data->regmap, HMC5843_ID_REG, + id, ARRAY_SIZE(id)); if (ret < 0) return ret; if (id[0] != 'H' || id[1] != '4' || id[2] != '3') { @@ -539,6 +550,44 @@ static const struct iio_info hmc5843_info = { static const unsigned long hmc5843_scan_masks[] = {0x7, 0}; +static const struct regmap_range hmc5843_readable_ranges[] = { + regmap_reg_range(0, HMC5843_ID_END), +}; + +static struct regmap_access_table hmc5843_readable_table = { + .yes_ranges = hmc5843_readable_ranges, + .n_yes_ranges = ARRAY_SIZE(hmc5843_readable_ranges), +}; + +static const struct regmap_range hmc5843_writable_ranges[] = { + regmap_reg_range(0, HMC5843_MODE_REG), +}; + +static struct regmap_access_table hmc5843_writable_table = { + .yes_ranges = hmc5843_writable_ranges, + .n_yes_ranges = ARRAY_SIZE(hmc5843_writable_ranges), +}; + +static const struct regmap_range hmc5843_volatile_ranges[] = { + regmap_reg_range(HMC5843_DATA_OUT_MSB_REGS, HMC5843_STATUS_REG), +}; + +static struct regmap_access_table hmc5843_volatile_table = { + .yes_ranges = hmc5843_volatile_ranges, + .n_yes_ranges = ARRAY_SIZE(hmc5843_volatile_ranges), +}; + +static struct regmap_config hmc5843_regmap_config = { + .reg_bits = 8, + .val_bits = 8, + + .rd_table = &hmc5843_readable_table, + .wr_table = &hmc5843_writable_table, + .volatile_table = &hmc5843_volatile_table, + + .cache_type = REGCACHE_RBTREE, +}; + static int hmc5843_probe(struct i2c_client *client, const struct i2c_device_id *id) { @@ -554,6 +603,7 @@ static int hmc5843_probe(struct i2c_client *client, data = iio_priv(indio_dev); data->client = client; data->variant = &hmc5843_chip_info_tbl[id->driver_data]; + data->regmap = devm_regmap_init_i2c(client, &hmc5843_regmap_config); mutex_init(&data->lock); i2c_set_clientdata(client, indio_dev); -- 1.8.5.5 _______________________________________________ devel mailing list devel@xxxxxxxxxxxxxxxxxxxxxx http://driverdev.linuxdriverproject.org/mailman/listinfo/driverdev-devel