[PATCH v2 2/4] hwmon: (adt7470) Convert to use regmap

From: Chris Packham
Date: Wed Aug 25 2021 - 22:42:03 EST

Convert the adt7470 to using regmap which allows better error handling.

Signed-off-by: Chris Packham <chris.packham@xxxxxxxxxxxxxxxxxxx>
---
Change in v2:
- split regmap and devm_hwmon_device_register_with_info into separate
patches to aid review

drivers/hwmon/adt7470.c | 430 +++++++++++++++++++++++-----------------
1 file changed, 249 insertions(+), 181 deletions(-)

diff --git a/drivers/hwmon/adt7470.c b/drivers/hwmon/adt7470.c
index 3358ec58b977..ad3e46667be8 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>

@@ -35,7 +36,10 @@ static const unsigned short normal_i2c[] = { 0x2C, 0x2E, 0x2F, I2C_CLIENT_END };
#define ADT7470_REG_PWM_MAX_BASE_ADDR 0x38
#define ADT7470_REG_PWM_MAX_MAX_ADDR 0x3B
#define ADT7470_REG_CFG 0x40
+#define ADT7470_STRT_MASK 0x01
+#define ADT7470_TEST_MASK 0x02
#define ADT7470_FSPD_MASK 0x04
+#define ADT7470_T05_STB_MASK 0x80
#define ADT7470_REG_ALARM1 0x41
#define ADT7470_R1T_ALARM 0x01
#define ADT7470_R2T_ALARM 0x02
@@ -137,7 +141,7 @@ 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;
@@ -171,52 +175,76 @@ 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, unsigned int reg,
+ unsigned int *val)
{
- u16 foo;
+ u8 regval[2];
+ int err;

- foo = i2c_smbus_read_byte_data(client, reg);
- foo |= ((u16)i2c_smbus_read_byte_data(client, reg + 1) << 8);
- return foo;
+ err = regmap_bulk_read(data->regmap, reg, &regval, 2);
+ if (err < 0)
+ return err;
+
+ *val = regval[0] | (regval[1] << 8);
+
+ return 0;
}

-static inline int adt7470_write_word_data(struct i2c_client *client, u8 reg,
- u16 value)
+static inline int adt7470_write_word_data(struct adt7470_data *data, unsigned int reg,
+ unsigned int val)
{
- return i2c_smbus_write_byte_data(client, reg, value & 0xFF)
- || i2c_smbus_write_byte_data(client, reg + 1, value >> 8);
+ u8 regval[2];
+
+ regval[0] = val & 0xFF;
+ regval[1] = val >> 8;
+
+ return regmap_bulk_write(data->regmap, reg, &regval, 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;
+ unsigned int pwm_cfg[2];
+ int err;
int i;
- u8 cfg, pwm[4], pwm_cfg[2];
+ u8 pwm[ADT7470_FAN_COUNT];

/* 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_read(data->regmap, ADT7470_REG_PWM_CFG(0), &pwm_cfg[0]);
+ if (err < 0)
+ return err;
+ err = regmap_read(data->regmap, ADT7470_REG_PWM_CFG(2), &pwm_cfg[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_PWM_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));
+ err = regmap_update_bits(data->regmap, ADT7470_REG_PWM_CFG(0),
+ ADT7470_PWM_AUTO_MASK, 0);
+ if (err < 0)
+ return err;
+ err = regmap_update_bits(data->regmap, ADT7470_REG_PWM_CFG(2),
+ ADT7470_PWM_AUTO_MASK, 0);
+ if (err < 0)
+ return err;

/* 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_PWM_COUNT);
+ if (err < 0)
+ return err;

/* start reading temperature sensors */
- cfg = i2c_smbus_read_byte_data(client, ADT7470_REG_CFG);
- cfg |= 0x80;
- i2c_smbus_write_byte_data(client, ADT7470_REG_CFG, cfg);
+ err = regmap_update_bits(data->regmap, ADT7470_REG_CFG,
+ ADT7470_T05_STB_MASK, ADT7470_T05_STB_MASK);
+ if (err < 0)
+ return err;

/* Delay is 200ms * number of temp sensors. */
res = msleep_interruptible((data->num_temp_sensors >= 0 ?
@@ -224,26 +252,31 @@ 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);
- cfg &= ~0x80;
- i2c_smbus_write_byte_data(client, ADT7470_REG_CFG, cfg);
+ err = regmap_update_bits(data->regmap, ADT7470_REG_CFG,
+ ADT7470_T05_STB_MASK, 0);
+ 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_write(data->regmap, ADT7470_REG_PWM_CFG(0), pwm_cfg[0]);
+ if (err < 0)
+ return err;
+ err = regmap_write(data->regmap, ADT7470_REG_PWM_CFG(2), pwm_cfg[1]);
+ if (err < 0)
+ return err;

- if (res) {
- pr_err("ha ha, interrupted\n");
+ if (res)
return -EAGAIN;
- }

/* Only count fans if we have to */
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;
}
@@ -258,7 +291,7 @@ static int adt7470_update_thread(void *p)

while (!kthread_should_stop()) {
mutex_lock(&data->lock);
- adt7470_read_temperatures(client, data);
+ adt7470_read_temperatures(data);
mutex_unlock(&data->lock);

set_current_state(TASK_INTERRUPTIBLE);
@@ -273,89 +306,116 @@ static int adt7470_update_thread(void *p)

static int adt7470_update_sensors(struct adt7470_data *data)
{
- struct i2c_client *client = data->client;
- u8 cfg;
+ unsigned int val;
+ 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_PWM_COUNT; i++) {
- int reg;
- int reg_mask;
-
- data->pwm[i] = i2c_smbus_read_byte_data(client,
- ADT7470_REG_PWM(i));
-
- if (i % 2)
- reg_mask = ADT7470_PWM2_AUTO_MASK;
- else
- reg_mask = ADT7470_PWM1_AUTO_MASK;
-
- reg = ADT7470_REG_PWM_CFG(i);
- if (i2c_smbus_read_byte_data(client, reg) & reg_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);
- if (!(i % 2))
- data->pwm_auto_temp[i] = cfg >> 4;
- else
- data->pwm_auto_temp[i] = cfg & 0xF;
+ for (i = 0; i < ADT7470_FAN_COUNT; i++) {
+ err = adt7470_read_word_data(data, ADT7470_REG_FAN(i), &val);
+ if (err < 0)
+ return err;
+ data->fan[i] = val;
}

- if (i2c_smbus_read_byte_data(client, ADT7470_REG_CFG) &
- ADT7470_FSPD_MASK)
- data->force_pwm_max = 1;
- else
- data->force_pwm_max = 0;
+ err = regmap_bulk_read(data->regmap, ADT7470_REG_PWM(0), &data->pwm[0], ADT7470_PWM_COUNT);
+ if (err < 0)
+ return err;

- data->alarm = i2c_smbus_read_byte_data(client, ADT7470_REG_ALARM1);
- 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);
+ for (i = 0; i < ADT7470_PWM_COUNT; i++) {
+ unsigned int mask;
+
+ if (i % 2)
+ mask = ADT7470_PWM2_AUTO_MASK;
+ else
+ mask = ADT7470_PWM1_AUTO_MASK;
+
+ err = regmap_read(data->regmap, ADT7470_REG_PWM_CFG(i), &val);
+ if (err < 0)
+ return err;
+ data->pwm_automatic[i] = !!(val & mask);
+
+ err = regmap_read(data->regmap, ADT7470_REG_PWM_AUTO_TEMP(i), &val);
+ if (err < 0)
+ return err;
+ if (!(i % 2))
+ data->pwm_auto_temp[i] = val >> 4;
+ else
+ data->pwm_auto_temp[i] = val & 0xF;
+ }
+
+ err = regmap_read(data->regmap, ADT7470_REG_CFG, &val);
+ if (err < 0)
+ return err;
+ data->force_pwm_max = !!(val & ADT7470_FSPD_MASK);
+
+ err = regmap_read(data->regmap, ADT7470_REG_ALARM1, &val);
+ if (err < 0)
+ return err;
+ data->alarm = val;
+ if (data->alarm & ADT7470_OOL_ALARM) {
+ err = regmap_read(data->regmap, ADT7470_REG_ALARM2, &val);
+ if (err < 0)
+ return err;
+ data->alarm |= ALARM2(val);
+ }
+
+ err = adt7470_read_word_data(data, ADT7470_REG_ALARM1_MASK, &val);
+ if (err < 0)
+ return err;
+ data->alarms_mask = val;

return 0;
}

static int adt7470_update_limits(struct adt7470_data *data)
{
- struct i2c_client *client = data->client;
+ unsigned int val;
+ 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_read(data->regmap, ADT7470_TEMP_MIN_REG(i), &val);
+ if (err < 0)
+ return err;
+ data->temp_min[i] = (s8)val;
+ err = regmap_read(data->regmap, ADT7470_TEMP_MAX_REG(i), &val);
+ if (err < 0)
+ return err;
+ data->temp_max[i] = (s8)val;
}

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));
+ err = adt7470_read_word_data(data, ADT7470_REG_FAN_MIN(i), &val);
+ if (err < 0)
+ return err;
+ data->fan_min[i] = val;
+ err = adt7470_read_word_data(data, ADT7470_REG_FAN_MAX(i), &val);
+ if (err < 0)
+ return err;
+ 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_read(data->regmap, ADT7470_REG_PWM_MAX(i), &val);
+ if (err < 0)
+ return err;
+ data->pwm_max[i] = val;
+ err = regmap_read(data->regmap, ADT7470_REG_PWM_MIN(i), &val);
+ if (err < 0)
+ return err;
+ data->pwm_min[i] = val;
+ err = regmap_read(data->regmap, ADT7470_REG_PWM_TMIN(i), &val);
+ if (err < 0)
+ return err;
+ data->pwm_tmin[i] = (s8)val;
}

return 0;
@@ -491,8 +551,8 @@ 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;
@@ -502,11 +562,11 @@ 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),
+ err = regmap_write(data->regmap, ADT7470_TEMP_MIN_REG(attr->index),
temp);
mutex_unlock(&data->lock);

- return count;
+ return err < 0 ? err : count;
}

static ssize_t temp_max_show(struct device *dev,
@@ -527,8 +587,8 @@ 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;
@@ -538,11 +598,10 @@ 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_write(data->regmap, ADT7470_TEMP_MAX_REG(attr->index), temp);
mutex_unlock(&data->lock);

- return count;
+ return err < 0 ? err : count;
}

static ssize_t temp_show(struct device *dev, struct device_attribute *devattr,
@@ -575,6 +634,7 @@ 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;
@@ -584,10 +644,10 @@ 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,
@@ -612,8 +672,8 @@ 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;
+ int err;

if (kstrtol(buf, 10, &temp) || !temp)
return -EINVAL;
@@ -623,10 +683,10 @@ 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);
+ err = adt7470_write_word_data(data, ADT7470_REG_FAN_MAX(attr->index), temp);
mutex_unlock(&data->lock);

- return count;
+ return err < 0 ? err : count;
}

static ssize_t fan_min_show(struct device *dev,
@@ -651,8 +711,8 @@ 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;
+ int err;

if (kstrtol(buf, 10, &temp) || !temp)
return -EINVAL;
@@ -662,10 +722,10 @@ 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);
+ err = adt7470_write_word_data(data, ADT7470_REG_FAN_MIN(attr->index), temp);
mutex_unlock(&data->lock);

- return count;
+ return err < 0 ? err : count;
}

static ssize_t fan_show(struct device *dev, struct device_attribute *devattr,
@@ -700,24 +760,20 @@ 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;
- u8 reg;
+ int err;

if (kstrtol(buf, 10, &temp))
return -EINVAL;

mutex_lock(&data->lock);
data->force_pwm_max = temp;
- reg = i2c_smbus_read_byte_data(client, ADT7470_REG_CFG);
- if (temp)
- reg |= ADT7470_FSPD_MASK;
- else
- reg &= ~ADT7470_FSPD_MASK;
- i2c_smbus_write_byte_data(client, ADT7470_REG_CFG, reg);
+ err = regmap_update_bits(data->regmap, ADT7470_REG_CFG,
+ ADT7470_FSPD_MASK,
+ temp ? ADT7470_FSPD_MASK : 0);
mutex_unlock(&data->lock);

- return count;
+ return err < 0 ? err : count;
}

static ssize_t pwm_show(struct device *dev, struct device_attribute *devattr,
@@ -737,8 +793,8 @@ 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;
@@ -747,10 +803,10 @@ 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_write(data->regmap, ADT7470_REG_PWM(attr->index), temp);
mutex_unlock(&data->lock);

- return count;
+ return err < 0 ? err : count;
}

/* These are the valid PWM frequencies to the nearest Hz */
@@ -762,13 +818,20 @@ 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;
+ unsigned int cfg_reg_1, 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_read(data->regmap, ADT7470_REG_CFG, &cfg_reg_1);
+ if (err < 0)
+ goto out;
+ err = regmap_read(data->regmap, ADT7470_REG_CFG_2, &cfg_reg_2);
+ if (err < 0)
+ goto out;
mutex_unlock(&data->lock);

index = (cfg_reg_2 & ADT7470_FREQ_MASK) >> ADT7470_FREQ_SHIFT;
@@ -778,6 +841,10 @@ 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,
@@ -785,11 +852,10 @@ 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;

if (kstrtol(buf, 10, &freq))
return -EINVAL;
@@ -805,16 +871,19 @@ 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_update_bits(data->regmap, ADT7470_REG_CFG,
+ ADT7470_CFG_LF, low_freq);
+ 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_update_bits(data->regmap, ADT7470_REG_CFG_2,
+ ADT7470_FREQ_MASK,
+ index << ADT7470_FREQ_SHIFT);
+out:
mutex_unlock(&data->lock);

- return count;
+ return err < 0 ? err : count;
}

static ssize_t pwm_max_show(struct device *dev,
@@ -835,8 +904,8 @@ 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;
@@ -845,11 +914,11 @@ 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_write(data->regmap, ADT7470_REG_PWM_MAX(attr->index),
+ temp);
mutex_unlock(&data->lock);

- return count;
+ return err < 0 ? err : count;
}

static ssize_t pwm_min_show(struct device *dev,
@@ -870,8 +939,8 @@ 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;
@@ -880,11 +949,11 @@ static ssize_t pwm_min_store(struct device *dev,

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_write(data->regmap, ADT7470_REG_PWM_MIN(attr->index),
+ temp);
mutex_unlock(&data->lock);

- return count;
+ return err < 0 ? err : count;
}

static ssize_t pwm_tmax_show(struct device *dev,
@@ -918,8 +987,8 @@ 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;
@@ -929,11 +998,11 @@ 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_write(data->regmap, ADT7470_REG_PWM_TMIN(attr->index),
+ temp);
mutex_unlock(&data->lock);

- return count;
+ return err < 0 ? err : count;
}

static ssize_t pwm_auto_show(struct device *dev,
@@ -954,11 +1023,9 @@ 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;
- u8 reg;
+ int err;

if (kstrtol(buf, 10, &temp))
return -EINVAL;
@@ -974,15 +1041,12 @@ 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);
- 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_update_bits(data->regmap, ADT7470_REG_PWM_CFG(attr->index),
+ pwm_auto_reg_mask,
+ temp ? pwm_auto_reg_mask : 0);
mutex_unlock(&data->lock);

- return count;
+ return err < 0 ? err : count;
}

static ssize_t pwm_auto_temp_show(struct device *dev,
@@ -1017,10 +1081,10 @@ 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);
+ unsigned int mask, val;
long temp;
- u8 reg;
+ int err;

if (kstrtol(buf, 10, &temp))
return -EINVAL;
@@ -1031,20 +1095,19 @@ 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);

if (!(attr->index % 2)) {
- reg &= 0xF;
- reg |= (temp << 4) & 0xF0;
+ mask = 0xF0;
+ val = (temp << 4) & 0xF0;
} else {
- reg &= 0xF0;
- reg |= temp & 0xF;
+ mask = 0x0F;
+ val = temp & 0x0F;
}

- i2c_smbus_write_byte_data(client, pwm_auto_reg, reg);
+ err = regmap_update_bits(data->regmap, pwm_auto_reg, mask, val);
mutex_unlock(&data->lock);

- return count;
+ return err < 0 ? err : count;
}

static ssize_t alarm_show(struct device *dev,
@@ -1053,6 +1116,9 @@ static ssize_t alarm_show(struct device *dev,
struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
struct adt7470_data *data = adt7470_update_device(dev);

+ if (IS_ERR(data))
+ return PTR_ERR(data);
+
if (data->alarm & attr->index)
return sprintf(buf, "1\n");
else
@@ -1288,23 +1354,19 @@ static int adt7470_detect(struct i2c_client *client,
return 0;
}

-static void adt7470_init_client(struct i2c_client *client)
-{
- int reg = i2c_smbus_read_byte_data(client, ADT7470_REG_CFG);
-
- 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);
- }
-}
+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)
@@ -1312,15 +1374,21 @@ 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 = regmap_update_bits(data->regmap, ADT7470_REG_CFG,
+ ADT7470_STRT_MASK | ADT7470_TEST_MASK,
+ ADT7470_STRT_MASK | ADT7470_TEST_MASK);
+ if (err < 0)
+ return err;

/* Register sysfs hooks */
hwmon_dev = devm_hwmon_device_register_with_groups(dev, client->name,
--
2.32.0