Re: [PATCH 2/2] hwmon: (adt7470) Convert to regmap

From: Chris Packham
Date: Wed Oct 28 2020 - 21:03:33 EST


On 24/10/20 10:40 am, Guenter Roeck wrote:
> 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@xxxxxxxxxxxxxxxxxxx>
>> ---
>> 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.
No specific reason. Probably just a too literal translation of the
existing code. I'll switch to regmap_update_bits() in v2.
>> /* 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).
Agreed. I do wonder if we should be setting data->temperatures_probed to
0 or taking some other action if adt7470_read_temperatures() fails but
I'll drop this chunk from the patch.
>
>> }
>>
>> 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) ?
Missed that. Will fix.
>
>> 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, &reg, 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, &reg, 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, &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, &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, &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, &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,