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Date: Fri, 23 Oct 2020 14:40:08 -0700
From: Guenter Roeck <linux@...ck-us.net>
To: Chris Packham <chris.packham@...iedtelesis.co.nz>
Cc: jdelvare@...e.com, Tobi Wulff <tobi.wulff@...iedtelesis.co.nz>,
linux-hwmon@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/2] hwmon: (adt7470) Convert to regmap
On Tue, Oct 20, 2020 at 11:34:23AM +1300, Chris Packham wrote:
> Convert the adt7470 to using regmap and add error handling.
>
> Signed-off-by: Chris Packham <chris.packham@...iedtelesis.co.nz>
> ---
> drivers/hwmon/adt7470.c | 388 ++++++++++++++++++++++++++--------------
> 1 file changed, 250 insertions(+), 138 deletions(-)
>
> diff --git a/drivers/hwmon/adt7470.c b/drivers/hwmon/adt7470.c
> index 2e8feacccf84..d20aeb3a2fdc 100644
> --- a/drivers/hwmon/adt7470.c
> +++ b/drivers/hwmon/adt7470.c
> @@ -18,6 +18,7 @@
> #include <linux/delay.h>
> #include <linux/log2.h>
> #include <linux/kthread.h>
> +#include <linux/regmap.h>
> #include <linux/slab.h>
> #include <linux/util_macros.h>
>
> @@ -137,7 +138,7 @@ static const unsigned short normal_i2c[] = { 0x2C, 0x2E, 0x2F, I2C_CLIENT_END };
> #define ADT7470_FREQ_SHIFT 4
>
> struct adt7470_data {
> - struct i2c_client *client;
> + struct regmap *regmap;
> struct mutex lock;
> char sensors_valid;
> char limits_valid;
> @@ -171,51 +172,73 @@ struct adt7470_data {
> * 16-bit registers on the ADT7470 are low-byte first. The data sheet says
> * that the low byte must be read before the high byte.
> */
> -static inline int adt7470_read_word_data(struct i2c_client *client, u8 reg)
> +static inline int adt7470_read_word_data(struct adt7470_data *data, u8 reg)
> {
> - u16 foo;
> - foo = i2c_smbus_read_byte_data(client, reg);
> - foo |= ((u16)i2c_smbus_read_byte_data(client, reg + 1) << 8);
> - return foo;
> + u8 val[2];
> + int err;
> +
> + err = regmap_bulk_read(data->regmap, reg, &val, 2);
> + if (err < 0)
> + return err;
> +
> + return val[0] | (val[1] << 8);
> }
>
> -static inline int adt7470_write_word_data(struct i2c_client *client, u8 reg,
> +static inline int adt7470_write_word_data(struct adt7470_data *data, u8 reg,
> u16 value)
> {
> - return i2c_smbus_write_byte_data(client, reg, value & 0xFF)
> - || i2c_smbus_write_byte_data(client, reg + 1, value >> 8);
> + u8 val[2];
> +
> + val[0] = value & 0xFF;
> + val[1] = value >> 8;
> +
> + return regmap_bulk_write(data->regmap, reg, &val, 2);
> }
>
> /* Probe for temperature sensors. Assumes lock is held */
> -static int adt7470_read_temperatures(struct i2c_client *client,
> - struct adt7470_data *data)
> +static int adt7470_read_temperatures(struct adt7470_data *data)
> {
> unsigned long res;
> + int err;
> int i;
> u8 cfg, pwm[4], pwm_cfg[2];
>
> /* save pwm[1-4] config register */
> - pwm_cfg[0] = i2c_smbus_read_byte_data(client, ADT7470_REG_PWM_CFG(0));
> - pwm_cfg[1] = i2c_smbus_read_byte_data(client, ADT7470_REG_PWM_CFG(2));
> + err = regmap_raw_read(data->regmap, ADT7470_REG_PWM_CFG(0), &pwm_cfg[0], 1);
> + if (err < 0)
> + return err;
> + err = regmap_raw_read(data->regmap, ADT7470_REG_PWM_CFG(2), &pwm_cfg[1], 1);
> + if (err < 0)
> + return err;
>
> /* set manual pwm to whatever it is set to now */
> - for (i = 0; i < ADT7470_FAN_COUNT; i++)
> - pwm[i] = i2c_smbus_read_byte_data(client, ADT7470_REG_PWM(i));
> + err = regmap_bulk_read(data->regmap, ADT7470_REG_PWM(0), &pwm[0], ADT7470_FAN_COUNT);
> + if (err < 0)
> + return err;
>
> /* put pwm in manual mode */
> - i2c_smbus_write_byte_data(client, ADT7470_REG_PWM_CFG(0),
> - pwm_cfg[0] & ~(ADT7470_PWM_AUTO_MASK));
> - i2c_smbus_write_byte_data(client, ADT7470_REG_PWM_CFG(2),
> - pwm_cfg[1] & ~(ADT7470_PWM_AUTO_MASK));
> + pwm_cfg[0] &= ~ADT7470_PWM_AUTO_MASK;
> + err = regmap_raw_write(data->regmap, ADT7470_REG_PWM_CFG(0), &pwm_cfg[0], 1);
> + if (err < 0)
> + return err;
> + pwm_cfg[1] &= ~ADT7470_PWM_AUTO_MASK;
> + err = regmap_raw_write(data->regmap, ADT7470_REG_PWM_CFG(2), &pwm_cfg[1], 1);
> + if (err < 0)
> + return err;
>
Any special reason for not using regmap_update_bits() ? Also, why
regmap_raw_read() and regmap_raw_write() instead of just regmap_read()
and regmap_write() ?
There is a lot of similar code below. I don't really see the benefit of
switching to regmap if we don't use the functions it provides.
> /* write pwm control to whatever it was */
> - for (i = 0; i < ADT7470_FAN_COUNT; i++)
> - i2c_smbus_write_byte_data(client, ADT7470_REG_PWM(i), pwm[i]);
> + err = regmap_bulk_write(data->regmap, ADT7470_REG_PWM(0), &pwm[0], ADT7470_FAN_COUNT);
> + if (err < 0)
> + return err;
>
> /* start reading temperature sensors */
> - cfg = i2c_smbus_read_byte_data(client, ADT7470_REG_CFG);
> + err = regmap_raw_read(data->regmap, ADT7470_REG_CFG, &cfg, 1);
> + if (err < 0)
> + return err;
> cfg |= 0x80;
> - i2c_smbus_write_byte_data(client, ADT7470_REG_CFG, cfg);
> + err = regmap_raw_write(data->regmap, ADT7470_REG_CFG, &cfg, 1);
> + if (err < 0)
> + return err;
>
> /* Delay is 200ms * number of temp sensors. */
> res = msleep_interruptible((data->num_temp_sensors >= 0 ?
> @@ -223,13 +246,21 @@ static int adt7470_read_temperatures(struct i2c_client *client,
> TEMP_COLLECTION_TIME));
>
> /* done reading temperature sensors */
> - cfg = i2c_smbus_read_byte_data(client, ADT7470_REG_CFG);
> + err = regmap_raw_read(data->regmap, ADT7470_REG_CFG, &cfg, 1);
> + if (err < 0)
> + return err;
> cfg &= ~0x80;
> - i2c_smbus_write_byte_data(client, ADT7470_REG_CFG, cfg);
> + err = regmap_raw_write(data->regmap, ADT7470_REG_CFG, &cfg, 1);
> + if (err < 0)
> + return err;
>
> /* restore pwm[1-4] config registers */
> - i2c_smbus_write_byte_data(client, ADT7470_REG_PWM_CFG(0), pwm_cfg[0]);
> - i2c_smbus_write_byte_data(client, ADT7470_REG_PWM_CFG(2), pwm_cfg[1]);
> + err = regmap_raw_write(data->regmap, ADT7470_REG_PWM_CFG(0), &pwm_cfg[0], 1);
> + if (err < 0)
> + return err;
> + err = regmap_raw_write(data->regmap, ADT7470_REG_PWM_CFG(2), &pwm_cfg[1], 1);
> + if (err < 0)
> + return err;
>
> if (res) {
> pr_err("ha ha, interrupted\n");
> @@ -240,13 +271,16 @@ static int adt7470_read_temperatures(struct i2c_client *client,
> if (data->num_temp_sensors >= 0)
> return 0;
>
> + err = regmap_bulk_read(data->regmap, ADT7470_TEMP_REG(0), &data->temp[0],
> + ADT7470_TEMP_COUNT);
> + if (err < 0)
> + return err;
> for (i = 0; i < ADT7470_TEMP_COUNT; i++) {
> - data->temp[i] = i2c_smbus_read_byte_data(client,
> - ADT7470_TEMP_REG(i));
> if (data->temp[i])
> data->num_temp_sensors = i + 1;
> }
> data->temperatures_probed = 1;
> +
whitespace change
> return 0;
> }
>
> @@ -254,10 +288,11 @@ static int adt7470_update_thread(void *p)
> {
> struct i2c_client *client = p;
> struct adt7470_data *data = i2c_get_clientdata(client);
> + int err = 0;
>
> while (!kthread_should_stop()) {
> mutex_lock(&data->lock);
> - adt7470_read_temperatures(client, data);
> + err = adt7470_read_temperatures(data);
> mutex_unlock(&data->lock);
>
> set_current_state(TASK_INTERRUPTIBLE);
> @@ -267,94 +302,124 @@ static int adt7470_update_thread(void *p)
> schedule_timeout(msecs_to_jiffies(data->auto_update_interval));
> }
>
> - return 0;
> + return err;
I don't immediately see the benefit of returning an error here.
That seems to be quite random (it only returns an error if the
most recent operation failed).
> }
>
> static int adt7470_update_sensors(struct adt7470_data *data)
> {
> - struct i2c_client *client = data->client;
> + int alarms_mask;
> + u8 vals[2];
> u8 cfg;
> + int err;
> int i;
>
> if (!data->temperatures_probed)
> - adt7470_read_temperatures(client, data);
> + err = adt7470_read_temperatures(data);
> else
> - for (i = 0; i < ADT7470_TEMP_COUNT; i++)
> - data->temp[i] = i2c_smbus_read_byte_data(client,
> - ADT7470_TEMP_REG(i));
> + err = regmap_bulk_read(data->regmap, ADT7470_TEMP_REG(0), &data->temp[0],
> + ADT7470_TEMP_COUNT);
> + if (err < 0)
> + return err;
>
> - for (i = 0; i < ADT7470_FAN_COUNT; i++)
> - data->fan[i] = adt7470_read_word_data(client,
> - ADT7470_REG_FAN(i));
> + for (i = 0; i < ADT7470_FAN_COUNT; i++) {
> + int val = adt7470_read_word_data(data, ADT7470_REG_FAN(i));
>
> - for (i = 0; i < ADT7470_PWM_COUNT; i++) {
> - int reg;
> - int reg_mask;
> + if (val < 0)
> + return val;
> +
> + data->fan[i] = val;
> + }
>
> - data->pwm[i] = i2c_smbus_read_byte_data(client,
> - ADT7470_REG_PWM(i));
> + err = regmap_bulk_read(data->regmap, ADT7470_REG_PWM(0), &data->pwm[0], ADT7470_PWM_COUNT);
> + if (err < 0)
> + return err;
> +
> + for (i = 0; i < ADT7470_PWM_COUNT; i++) {
> + u8 mask;
> + u8 val;
>
> if (i % 2)
> - reg_mask = ADT7470_PWM2_AUTO_MASK;
> + mask = ADT7470_PWM2_AUTO_MASK;
> else
> - reg_mask = ADT7470_PWM1_AUTO_MASK;
> + mask = ADT7470_PWM1_AUTO_MASK;
>
> - reg = ADT7470_REG_PWM_CFG(i);
> - if (i2c_smbus_read_byte_data(client, reg) & reg_mask)
> + err = regmap_raw_read(data->regmap, ADT7470_REG_PWM_CFG(i), &val, 1);
> + if (err < 0)
> + return err;
> + if (val & mask)
> data->pwm_automatic[i] = 1;
> else
> data->pwm_automatic[i] = 0;
>
> - reg = ADT7470_REG_PWM_AUTO_TEMP(i);
> - cfg = i2c_smbus_read_byte_data(client, reg);
> + err = regmap_raw_read(data->regmap, ADT7470_REG_PWM_AUTO_TEMP(i), &val, 1);
> + if (err < 0)
> + return err;
> if (!(i % 2))
> - data->pwm_auto_temp[i] = cfg >> 4;
> + data->pwm_auto_temp[i] = val >> 4;
> else
> - data->pwm_auto_temp[i] = cfg & 0xF;
> + data->pwm_auto_temp[i] = val & 0xF;
> }
>
> - if (i2c_smbus_read_byte_data(client, ADT7470_REG_CFG) &
> - ADT7470_FSPD_MASK)
> + err = regmap_raw_read(data->regmap, ADT7470_REG_CFG, &cfg, 1);
> + if (err < 0)
> + return err;
> + if (cfg & ADT7470_FSPD_MASK)
> data->force_pwm_max = 1;
> else
> data->force_pwm_max = 0;
>
> - data->alarm = i2c_smbus_read_byte_data(client, ADT7470_REG_ALARM1);
> + err = regmap_bulk_read(data->regmap, ADT7470_REG_ALARM1, &vals[0], 2);
> + if (err < 0)
> + return err;
> + data->alarm = vals[0];
> if (data->alarm & ADT7470_OOL_ALARM)
> - data->alarm |= ALARM2(i2c_smbus_read_byte_data(client,
> - ADT7470_REG_ALARM2));
> - data->alarms_mask = adt7470_read_word_data(client,
> - ADT7470_REG_ALARM1_MASK);
> + data->alarm |= ALARM2(vals[1]);
> +
> + alarms_mask = adt7470_read_word_data(data, ADT7470_REG_ALARM1_MASK);
> + if (alarms_mask < 0)
> + return alarms_mask;
> + data->alarms_mask = alarms_mask;
>
> return 0;
> }
>
> static int adt7470_update_limits(struct adt7470_data *data)
> {
> - struct i2c_client *client = data->client;
> + int err;
> int i;
>
> for (i = 0; i < ADT7470_TEMP_COUNT; i++) {
> - data->temp_min[i] = i2c_smbus_read_byte_data(client,
> - ADT7470_TEMP_MIN_REG(i));
> - data->temp_max[i] = i2c_smbus_read_byte_data(client,
> - ADT7470_TEMP_MAX_REG(i));
> + err = regmap_raw_read(data->regmap, ADT7470_TEMP_MIN_REG(i), &data->temp_min[i], 1);
> + if (err < 0)
> + return err;
> + err = regmap_raw_read(data->regmap, ADT7470_TEMP_MAX_REG(i), &data->temp_max[i], 1);
> + if (err < 0)
> + return err;
> }
>
> for (i = 0; i < ADT7470_FAN_COUNT; i++) {
> - data->fan_min[i] = adt7470_read_word_data(client,
> - ADT7470_REG_FAN_MIN(i));
> - data->fan_max[i] = adt7470_read_word_data(client,
> - ADT7470_REG_FAN_MAX(i));
> + int val;
> +
> + val = adt7470_read_word_data(data, ADT7470_REG_FAN_MIN(i));
> + if (val < 0)
> + return val;
> + data->fan_min[i] = val;
> + val = adt7470_read_word_data(data, ADT7470_REG_FAN_MAX(i));
> + if (val < 0)
> + return val;
> + data->fan_max[i] = val;
> }
>
> for (i = 0; i < ADT7470_PWM_COUNT; i++) {
> - data->pwm_max[i] = i2c_smbus_read_byte_data(client,
> - ADT7470_REG_PWM_MAX(i));
> - data->pwm_min[i] = i2c_smbus_read_byte_data(client,
> - ADT7470_REG_PWM_MIN(i));
> - data->pwm_tmin[i] = i2c_smbus_read_byte_data(client,
> - ADT7470_REG_PWM_TMIN(i));
> + err = regmap_raw_read(data->regmap, ADT7470_REG_PWM_MAX(i), &data->pwm_max[i], 1);
> + if (err < 0)
> + return err;
> + err = regmap_raw_read(data->regmap, ADT7470_REG_PWM_MIN(i), &data->pwm_min[i], 1);
> + if (err < 0)
> + return err;
> + err = regmap_raw_read(data->regmap, ADT7470_REG_PWM_TMIN(i), &data->pwm_tmin[i], 1);
> + if (err < 0)
> + return err;
> }
>
> return 0;
> @@ -490,8 +555,8 @@ static ssize_t temp_min_store(struct device *dev,
> {
> struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
> struct adt7470_data *data = dev_get_drvdata(dev);
> - struct i2c_client *client = data->client;
> long temp;
> + int err;
>
> if (kstrtol(buf, 10, &temp))
> return -EINVAL;
> @@ -501,11 +566,11 @@ static ssize_t temp_min_store(struct device *dev,
>
> mutex_lock(&data->lock);
> data->temp_min[attr->index] = temp;
> - i2c_smbus_write_byte_data(client, ADT7470_TEMP_MIN_REG(attr->index),
> - temp);
> + err = regmap_raw_write(data->regmap, ADT7470_TEMP_MIN_REG(attr->index),
> + &data->temp_min[attr->index], 1);
> mutex_unlock(&data->lock);
>
> - return count;
> + return err < 0 ? err : count;
> }
>
> static ssize_t temp_max_show(struct device *dev,
> @@ -526,8 +591,8 @@ static ssize_t temp_max_store(struct device *dev,
> {
> struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
> struct adt7470_data *data = dev_get_drvdata(dev);
> - struct i2c_client *client = data->client;
> long temp;
> + int err;
>
> if (kstrtol(buf, 10, &temp))
> return -EINVAL;
> @@ -537,11 +602,11 @@ static ssize_t temp_max_store(struct device *dev,
>
> mutex_lock(&data->lock);
> data->temp_max[attr->index] = temp;
> - i2c_smbus_write_byte_data(client, ADT7470_TEMP_MAX_REG(attr->index),
> - temp);
> + err = regmap_raw_write(data->regmap, ADT7470_TEMP_MAX_REG(attr->index),
> + &data->temp_max[attr->index], 1);
> mutex_unlock(&data->lock);
>
> - return count;
> + return err < 0 ? err : count;
> }
>
> static ssize_t temp_show(struct device *dev, struct device_attribute *devattr,
> @@ -574,6 +639,7 @@ static ssize_t alarm_mask_store(struct device *dev,
> {
> struct adt7470_data *data = dev_get_drvdata(dev);
> long mask;
> + int err;
>
> if (kstrtoul(buf, 0, &mask))
> return -EINVAL;
> @@ -583,10 +649,10 @@ static ssize_t alarm_mask_store(struct device *dev,
>
> mutex_lock(&data->lock);
> data->alarms_mask = mask;
> - adt7470_write_word_data(data->client, ADT7470_REG_ALARM1_MASK, mask);
> + err = adt7470_write_word_data(data, ADT7470_REG_ALARM1_MASK, mask);
> mutex_unlock(&data->lock);
>
> - return count;
> + return err < 0 ? err : count;
> }
>
> static ssize_t fan_max_show(struct device *dev,
> @@ -611,7 +677,6 @@ static ssize_t fan_max_store(struct device *dev,
> {
> struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
> struct adt7470_data *data = dev_get_drvdata(dev);
> - struct i2c_client *client = data->client;
> long temp;
>
> if (kstrtol(buf, 10, &temp) || !temp)
> @@ -622,7 +687,7 @@ static ssize_t fan_max_store(struct device *dev,
>
> mutex_lock(&data->lock);
> data->fan_max[attr->index] = temp;
> - adt7470_write_word_data(client, ADT7470_REG_FAN_MAX(attr->index), temp);
> + adt7470_write_word_data(data, ADT7470_REG_FAN_MAX(attr->index), temp);
Why no error handling here (and in some other places) ?
> mutex_unlock(&data->lock);
>
> return count;
> @@ -650,7 +715,6 @@ static ssize_t fan_min_store(struct device *dev,
> {
> struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
> struct adt7470_data *data = dev_get_drvdata(dev);
> - struct i2c_client *client = data->client;
> long temp;
>
> if (kstrtol(buf, 10, &temp) || !temp)
> @@ -661,7 +725,7 @@ static ssize_t fan_min_store(struct device *dev,
>
> mutex_lock(&data->lock);
> data->fan_min[attr->index] = temp;
> - adt7470_write_word_data(client, ADT7470_REG_FAN_MIN(attr->index), temp);
> + adt7470_write_word_data(data, ADT7470_REG_FAN_MIN(attr->index), temp);
> mutex_unlock(&data->lock);
>
> return count;
> @@ -699,8 +763,8 @@ static ssize_t force_pwm_max_store(struct device *dev,
> const char *buf, size_t count)
> {
> struct adt7470_data *data = dev_get_drvdata(dev);
> - struct i2c_client *client = data->client;
> long temp;
> + int err;
> u8 reg;
>
> if (kstrtol(buf, 10, &temp))
> @@ -708,15 +772,18 @@ static ssize_t force_pwm_max_store(struct device *dev,
>
> mutex_lock(&data->lock);
> data->force_pwm_max = temp;
> - reg = i2c_smbus_read_byte_data(client, ADT7470_REG_CFG);
> + err = regmap_raw_read(data->regmap, ADT7470_REG_CFG, ®, 1);
> + if (err < 0)
> + goto out;
> if (temp)
> reg |= ADT7470_FSPD_MASK;
> else
> reg &= ~ADT7470_FSPD_MASK;
> - i2c_smbus_write_byte_data(client, ADT7470_REG_CFG, reg);
> + err = regmap_raw_write(data->regmap, ADT7470_REG_CFG, ®, 1);
> +out:
> mutex_unlock(&data->lock);
>
> - return count;
> + return err < 0 ? err : count;
> }
>
> static ssize_t pwm_show(struct device *dev, struct device_attribute *devattr,
> @@ -736,8 +803,8 @@ static ssize_t pwm_store(struct device *dev, struct device_attribute *devattr,
> {
> struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
> struct adt7470_data *data = dev_get_drvdata(dev);
> - struct i2c_client *client = data->client;
> long temp;
> + int err;
>
> if (kstrtol(buf, 10, &temp))
> return -EINVAL;
> @@ -746,10 +813,11 @@ static ssize_t pwm_store(struct device *dev, struct device_attribute *devattr,
>
> mutex_lock(&data->lock);
> data->pwm[attr->index] = temp;
> - i2c_smbus_write_byte_data(client, ADT7470_REG_PWM(attr->index), temp);
> + err = regmap_raw_write(data->regmap, ADT7470_REG_PWM(attr->index),
> + &data->pwm[attr->index], 1);
> mutex_unlock(&data->lock);
>
> - return count;
> + return err < 0 ? err : count;
> }
>
> /* These are the valid PWM frequencies to the nearest Hz */
> @@ -761,13 +829,21 @@ static ssize_t pwm1_freq_show(struct device *dev,
> struct device_attribute *devattr, char *buf)
> {
> struct adt7470_data *data = adt7470_update_device(dev);
> - unsigned char cfg_reg_1;
> - unsigned char cfg_reg_2;
> + u8 cfg_reg_1;
> + u8 cfg_reg_2;
> int index;
> + int err;
> +
> + if (IS_ERR(data))
> + return PTR_ERR(data);
>
> mutex_lock(&data->lock);
> - cfg_reg_1 = i2c_smbus_read_byte_data(data->client, ADT7470_REG_CFG);
> - cfg_reg_2 = i2c_smbus_read_byte_data(data->client, ADT7470_REG_CFG_2);
> + err = regmap_raw_read(data->regmap, ADT7470_REG_CFG, &cfg_reg_1, 1);
> + if (err < 0)
> + goto out;
> + err = regmap_raw_read(data->regmap, ADT7470_REG_CFG_2, &cfg_reg_2, 1);
> + if (err < 0)
> + goto out;
> mutex_unlock(&data->lock);
>
> index = (cfg_reg_2 & ADT7470_FREQ_MASK) >> ADT7470_FREQ_SHIFT;
> @@ -777,6 +853,10 @@ static ssize_t pwm1_freq_show(struct device *dev,
> index = ARRAY_SIZE(adt7470_freq_map) - 1;
>
> return scnprintf(buf, PAGE_SIZE, "%d\n", adt7470_freq_map[index]);
> +
> +out:
> + mutex_unlock(&data->lock);
> + return err;
> }
>
> static ssize_t pwm1_freq_store(struct device *dev,
> @@ -784,11 +864,11 @@ static ssize_t pwm1_freq_store(struct device *dev,
> const char *buf, size_t count)
> {
> struct adt7470_data *data = dev_get_drvdata(dev);
> - struct i2c_client *client = data->client;
> long freq;
> int index;
> int low_freq = ADT7470_CFG_LF;
> - unsigned char val;
> + int err;
> + u8 val;
>
> if (kstrtol(buf, 10, &freq))
> return -EINVAL;
> @@ -804,16 +884,26 @@ static ssize_t pwm1_freq_store(struct device *dev,
>
> mutex_lock(&data->lock);
> /* Configuration Register 1 */
> - val = i2c_smbus_read_byte_data(client, ADT7470_REG_CFG);
> - i2c_smbus_write_byte_data(client, ADT7470_REG_CFG,
> - (val & ~ADT7470_CFG_LF) | low_freq);
> + err = regmap_raw_read(data->regmap, ADT7470_REG_CFG, &val, 1);
> + if (err < 0)
> + goto out;
> + val &= ~ADT7470_CFG_LF;
> + val |= low_freq;
> + err = regmap_raw_write(data->regmap, ADT7470_REG_CFG, &val, 1);
> + if (err < 0)
> + goto out;
> +
> /* Configuration Register 2 */
> - val = i2c_smbus_read_byte_data(client, ADT7470_REG_CFG_2);
> - i2c_smbus_write_byte_data(client, ADT7470_REG_CFG_2,
> - (val & ~ADT7470_FREQ_MASK) | (index << ADT7470_FREQ_SHIFT));
> + err = regmap_raw_read(data->regmap, ADT7470_REG_CFG_2, &val, 1);
> + if (err < 0)
> + goto out;
> + val &= ~ADT7470_FREQ_MASK;
> + val |= index << ADT7470_FREQ_SHIFT;
> + err = regmap_raw_write(data->regmap, ADT7470_REG_CFG_2, &val, 1);
> +out:
> mutex_unlock(&data->lock);
>
> - return count;
> + return err < 0 ? err : count;
> }
>
> static ssize_t pwm_max_show(struct device *dev,
> @@ -834,8 +924,8 @@ static ssize_t pwm_max_store(struct device *dev,
> {
> struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
> struct adt7470_data *data = dev_get_drvdata(dev);
> - struct i2c_client *client = data->client;
> long temp;
> + int err;
>
> if (kstrtol(buf, 10, &temp))
> return -EINVAL;
> @@ -844,11 +934,11 @@ static ssize_t pwm_max_store(struct device *dev,
>
> mutex_lock(&data->lock);
> data->pwm_max[attr->index] = temp;
> - i2c_smbus_write_byte_data(client, ADT7470_REG_PWM_MAX(attr->index),
> - temp);
> + err = regmap_raw_write(data->regmap, ADT7470_REG_PWM_MAX(attr->index),
> + &data->pwm_max[attr->index], 1);
> mutex_unlock(&data->lock);
>
> - return count;
> + return err < 0 ? err : count;
> }
>
> static ssize_t pwm_min_show(struct device *dev,
> @@ -869,8 +959,8 @@ static ssize_t pwm_min_store(struct device *dev,
> {
> struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
> struct adt7470_data *data = dev_get_drvdata(dev);
> - struct i2c_client *client = data->client;
> long temp;
> + int err;
>
> if (kstrtol(buf, 10, &temp))
> return -EINVAL;
> @@ -878,12 +968,11 @@ static ssize_t pwm_min_store(struct device *dev,
> temp = clamp_val(temp, 0, 255);
>
> mutex_lock(&data->lock);
> - data->pwm_min[attr->index] = temp;
> - i2c_smbus_write_byte_data(client, ADT7470_REG_PWM_MIN(attr->index),
> - temp);
> + err = regmap_raw_write(data->regmap, ADT7470_REG_PWM_MIN(attr->index),
> + &data->pwm_min[attr->index], 1);
> mutex_unlock(&data->lock);
>
> - return count;
> + return err < 0 ? err : count;
> }
>
> static ssize_t pwm_tmax_show(struct device *dev,
> @@ -917,8 +1006,8 @@ static ssize_t pwm_tmin_store(struct device *dev,
> {
> struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
> struct adt7470_data *data = dev_get_drvdata(dev);
> - struct i2c_client *client = data->client;
> long temp;
> + int err;
>
> if (kstrtol(buf, 10, &temp))
> return -EINVAL;
> @@ -928,11 +1017,11 @@ static ssize_t pwm_tmin_store(struct device *dev,
>
> mutex_lock(&data->lock);
> data->pwm_tmin[attr->index] = temp;
> - i2c_smbus_write_byte_data(client, ADT7470_REG_PWM_TMIN(attr->index),
> - temp);
> + err = regmap_raw_write(data->regmap, ADT7470_REG_PWM_TMIN(attr->index),
> + &data->pwm_tmin[attr->index], 1);
> mutex_unlock(&data->lock);
>
> - return count;
> + return err < 0 ? err : count;
> }
>
> static ssize_t pwm_auto_show(struct device *dev,
> @@ -953,10 +1042,10 @@ static ssize_t pwm_auto_store(struct device *dev,
> {
> struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
> struct adt7470_data *data = dev_get_drvdata(dev);
> - struct i2c_client *client = data->client;
> int pwm_auto_reg = ADT7470_REG_PWM_CFG(attr->index);
> int pwm_auto_reg_mask;
> long temp;
> + int err;
> u8 reg;
>
> if (kstrtol(buf, 10, &temp))
> @@ -973,15 +1062,18 @@ static ssize_t pwm_auto_store(struct device *dev,
>
> mutex_lock(&data->lock);
> data->pwm_automatic[attr->index] = temp;
> - reg = i2c_smbus_read_byte_data(client, pwm_auto_reg);
> + err = regmap_raw_read(data->regmap, pwm_auto_reg, ®, 1);
> + if (err < 0)
> + goto out;
> if (temp)
> reg |= pwm_auto_reg_mask;
> else
> reg &= ~pwm_auto_reg_mask;
> - i2c_smbus_write_byte_data(client, pwm_auto_reg, reg);
> + err = regmap_raw_write(data->regmap, pwm_auto_reg, ®, 1);
> +out:
> mutex_unlock(&data->lock);
>
> - return count;
> + return err < 0 ? err : count;
> }
>
> static ssize_t pwm_auto_temp_show(struct device *dev,
> @@ -1016,9 +1108,9 @@ static ssize_t pwm_auto_temp_store(struct device *dev,
> {
> struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
> struct adt7470_data *data = dev_get_drvdata(dev);
> - struct i2c_client *client = data->client;
> int pwm_auto_reg = ADT7470_REG_PWM_AUTO_TEMP(attr->index);
> long temp;
> + int err;
> u8 reg;
>
> if (kstrtol(buf, 10, &temp))
> @@ -1030,7 +1122,10 @@ static ssize_t pwm_auto_temp_store(struct device *dev,
>
> mutex_lock(&data->lock);
> data->pwm_automatic[attr->index] = temp;
> - reg = i2c_smbus_read_byte_data(client, pwm_auto_reg);
> +
> + err = regmap_raw_read(data->regmap, pwm_auto_reg, ®, 1);
> + if (err < 0)
> + goto out;
>
> if (!(attr->index % 2)) {
> reg &= 0xF;
> @@ -1040,10 +1135,11 @@ static ssize_t pwm_auto_temp_store(struct device *dev,
> reg |= temp & 0xF;
> }
>
> - i2c_smbus_write_byte_data(client, pwm_auto_reg, reg);
> + err = regmap_raw_write(data->regmap, pwm_auto_reg, ®, 1);
> +out:
> mutex_unlock(&data->lock);
>
> - return count;
> + return err < 0 ? err : count;
> }
>
> static ssize_t alarm_show(struct device *dev,
> @@ -1287,23 +1383,35 @@ static int adt7470_detect(struct i2c_client *client,
> return 0;
> }
>
> -static void adt7470_init_client(struct i2c_client *client)
> +static int adt7470_init_client(struct device *dev, struct adt7470_data *data)
> {
> - int reg = i2c_smbus_read_byte_data(client, ADT7470_REG_CFG);
> + int err;
> + u8 val;
>
> - if (reg < 0) {
> - dev_err(&client->dev, "cannot read configuration register\n");
> - } else {
> - /* start monitoring (and do a self-test) */
> - i2c_smbus_write_byte_data(client, ADT7470_REG_CFG, reg | 3);
> + err = regmap_raw_read(data->regmap, ADT7470_REG_CFG, &val, 1);
> + if (err < 0) {
> + dev_err(dev, "cannot read configuration register\n");
> + return err;
> }
> +
> + val |= 3;
> +
> + return regmap_raw_write(data->regmap, ADT7470_REG_CFG, &val, 1);
> }
>
> +static const struct regmap_config adt7470_regmap_config = {
> + .reg_bits = 8,
> + .val_bits = 8,
> + .use_single_read = true,
> + .use_single_write = true,
> +};
> +
> static int adt7470_probe(struct i2c_client *client)
> {
> struct device *dev = &client->dev;
> struct adt7470_data *data;
> struct device *hwmon_dev;
> + int err;
>
> data = devm_kzalloc(dev, sizeof(struct adt7470_data), GFP_KERNEL);
> if (!data)
> @@ -1311,15 +1419,19 @@ static int adt7470_probe(struct i2c_client *client)
>
> data->num_temp_sensors = -1;
> data->auto_update_interval = AUTO_UPDATE_INTERVAL;
> + data->regmap = devm_regmap_init_i2c(client, &adt7470_regmap_config);
> + if (IS_ERR(data->regmap))
> + return PTR_ERR(data->regmap);
>
> i2c_set_clientdata(client, data);
> - data->client = client;
> mutex_init(&data->lock);
>
> dev_info(&client->dev, "%s chip found\n", client->name);
>
> /* Initialize the ADT7470 chip */
> - adt7470_init_client(client);
> + err = adt7470_init_client(dev, data);
> + if (err < 0)
> + return err;
>
> /* Register sysfs hooks */
> hwmon_dev = devm_hwmon_device_register_with_groups(dev, client->name,
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