@@ -21,6 +21,7 @@
#include <linux/mutex.h>
#include <linux/platform_data/max6639.h>
#include <linux/regmap.h>
+#include <linux/util_macros.h>
/* Addresses to scan */
static const unsigned short normal_i2c[] = { 0x2c, 0x2e, 0x2f, I2C_CLIENT_END };
@@ -55,13 +56,17 @@ static const unsigned short normal_i2c[] = { 0x2c, 0x2e, 0x2f, I2C_CLIENT_END };
#define MAX6639_GCONFIG_PWM_FREQ_HI 0x08
#define MAX6639_FAN_CONFIG1_PWM 0x80
-
+#define MAX6639_FAN_CONFIG3_FREQ_MASK 0x03
#define MAX6639_FAN_CONFIG3_THERM_FULL_SPEED 0x40
#define MAX6639_NUM_CHANNELS 2
static const int rpm_ranges[] = { 2000, 4000, 8000, 16000 };
+/* Supported PWM frequency */
+static const unsigned int freq_table[] = { 20, 33, 50, 100, 5000, 8333, 12500,
+ 25000 };
+
#define FAN_FROM_REG(val, rpm_range) ((val) == 0 || (val) == 255 ? \
0 : (rpm_ranges[rpm_range] * 30) / (val))
#define TEMP_LIMIT_TO_REG(val) clamp_val((val) / 1000, 0, 255)
@@ -73,19 +78,16 @@ struct max6639_data {
struct regmap *regmap;
/* Register values initialized only once */
- u8 ppr; /* Pulses per rotation 0..3 for 1..4 ppr */
- u8 rpm_range; /* Index in above rpm_ranges table */
+ u8 ppr[MAX6639_NUM_CHANNELS]; /* Pulses per rotation 0..3 for 1..4 ppr */
+ u8 rpm_range[MAX6639_NUM_CHANNELS]; /* Index in above rpm_ranges table */
/* Optional regulator for FAN supply */
struct regulator *reg;
};
-static ssize_t temp_input_show(struct device *dev,
- struct device_attribute *dev_attr, char *buf)
+static int max6639_temp_read_input(struct device *dev, int channel, long *temp)
{
- long temp;
struct max6639_data *data = dev_get_drvdata(dev);
- struct sensor_device_attribute *attr = to_sensor_dev_attr(dev_attr);
unsigned int val;
int res;
@@ -93,251 +95,364 @@ static ssize_t temp_input_show(struct device *dev,
* Lock isn't needed as MAX6639_REG_TEMP wpnt change for at least 250ms after reading
* MAX6639_REG_TEMP_EXT
*/
- res = regmap_read(data->regmap, MAX6639_REG_TEMP_EXT(attr->index), &val);
+ res = regmap_read(data->regmap, MAX6639_REG_TEMP_EXT(channel), &val);
if (res < 0)
return res;
- temp = val >> 5;
- res = regmap_read(data->regmap, MAX6639_REG_TEMP(attr->index), &val);
+ *temp = val >> 5;
+ res = regmap_read(data->regmap, MAX6639_REG_TEMP(channel), &val);
if (res < 0)
return res;
- temp |= val << 3;
- temp *= 125;
+ *temp |= val << 3;
+ *temp *= 125;
- return sprintf(buf, "%ld\n", temp);
+ return 0;
}
-static ssize_t temp_fault_show(struct device *dev,
- struct device_attribute *dev_attr, char *buf)
+static int max6639_temp_read_fault(struct device *dev, int channel, long *fault)
{
struct max6639_data *data = dev_get_drvdata(dev);
- struct sensor_device_attribute *attr = to_sensor_dev_attr(dev_attr);
unsigned int val;
int res;
- res = regmap_read(data->regmap, MAX6639_REG_TEMP_EXT(attr->index), &val);
+ res = regmap_read(data->regmap, MAX6639_REG_TEMP_EXT(channel), &val);
if (res < 0)
return res;
- return sprintf(buf, "%d\n", val & 1);
+ *fault = val & 1;
+
+ return 0;
}
-static ssize_t temp_max_show(struct device *dev,
- struct device_attribute *dev_attr, char *buf)
+static int max6639_temp_read_max(struct device *dev, int channel, long *max)
{
- struct sensor_device_attribute *attr = to_sensor_dev_attr(dev_attr);
struct max6639_data *data = dev_get_drvdata(dev);
unsigned int val;
int res;
- res = regmap_read(data->regmap, MAX6639_REG_THERM_LIMIT(attr->index), &val);
+ res = regmap_read(data->regmap, MAX6639_REG_THERM_LIMIT(channel), &val);
if (res < 0)
return res;
- return sprintf(buf, "%d\n", (val * 1000));
+ *max = (long)val * 1000;
+
+ return 0;
}
-static ssize_t temp_max_store(struct device *dev,
- struct device_attribute *dev_attr,
- const char *buf, size_t count)
+static int max6639_temp_read_crit(struct device *dev, int channel, long *crit)
{
- struct sensor_device_attribute *attr = to_sensor_dev_attr(dev_attr);
struct max6639_data *data = dev_get_drvdata(dev);
- unsigned long val;
+ unsigned int val;
int res;
- res = kstrtoul(buf, 10, &val);
- if (res)
+ res = regmap_read(data->regmap, MAX6639_REG_ALERT_LIMIT(channel), &val);
+ if (res < 0)
return res;
- regmap_write(data->regmap, MAX6639_REG_THERM_LIMIT(attr->index),
- TEMP_LIMIT_TO_REG(val));
- return count;
+ *crit = (long)val * 1000;
+
+ return 0;
}
-static ssize_t temp_crit_show(struct device *dev,
- struct device_attribute *dev_attr, char *buf)
+static int max6639_temp_read_emergency(struct device *dev, int channel, long *emerg)
{
- struct sensor_device_attribute *attr = to_sensor_dev_attr(dev_attr);
struct max6639_data *data = dev_get_drvdata(dev);
unsigned int val;
int res;
- res = regmap_read(data->regmap, MAX6639_REG_ALERT_LIMIT(attr->index), &val);
+ res = regmap_read(data->regmap, MAX6639_REG_OT_LIMIT(channel), &val);
if (res < 0)
return res;
- return sprintf(buf, "%d\n", (val * 1000));
+ *emerg = (long)val * 1000;
+
+ return 0;
}
-static ssize_t temp_crit_store(struct device *dev,
- struct device_attribute *dev_attr,
- const char *buf, size_t count)
+static int max6639_get_status(struct device *dev, unsigned int *status)
{
- struct sensor_device_attribute *attr = to_sensor_dev_attr(dev_attr);
struct max6639_data *data = dev_get_drvdata(dev);
- unsigned long val;
+ unsigned int val;
int res;
- res = kstrtoul(buf, 10, &val);
- if (res)
+ res = regmap_read(data->regmap, MAX6639_REG_STATUS, &val);
+ if (res < 0)
return res;
- regmap_write(data->regmap, MAX6639_REG_ALERT_LIMIT(attr->index),
- TEMP_LIMIT_TO_REG(val));
- return count;
+ *status = val;
+
+ return 0;
}
-static ssize_t temp_emergency_show(struct device *dev,
- struct device_attribute *dev_attr,
- char *buf)
+static int max6639_temp_set_max(struct max6639_data *data, int channel, long val)
{
- struct sensor_device_attribute *attr = to_sensor_dev_attr(dev_attr);
- struct max6639_data *data = dev_get_drvdata(dev);
- unsigned int val;
int res;
- res = regmap_read(data->regmap, MAX6639_REG_OT_LIMIT(attr->index), &val);
- if (res < 0)
- return res;
-
- return sprintf(buf, "%d\n", (val * 1000));
+ res = regmap_write(data->regmap, MAX6639_REG_THERM_LIMIT(channel),
+ TEMP_LIMIT_TO_REG(val));
+ return res;
}
-static ssize_t temp_emergency_store(struct device *dev,
- struct device_attribute *dev_attr,
- const char *buf, size_t count)
+static int max6639_temp_set_crit(struct max6639_data *data, int channel, long val)
{
- struct sensor_device_attribute *attr = to_sensor_dev_attr(dev_attr);
- struct max6639_data *data = dev_get_drvdata(dev);
- unsigned long val;
int res;
- res = kstrtoul(buf, 10, &val);
- if (res)
- return res;
+ res = regmap_write(data->regmap, MAX6639_REG_ALERT_LIMIT(channel), TEMP_LIMIT_TO_REG(val));
+
+ return res;
+}
+
+static int max6639_temp_set_emergency(struct max6639_data *data, int channel, long val)
+{
+ int res;
- regmap_write(data->regmap, MAX6639_REG_OT_LIMIT(attr->index), TEMP_LIMIT_TO_REG(val));
+ res = regmap_write(data->regmap, MAX6639_REG_OT_LIMIT(channel), TEMP_LIMIT_TO_REG(val));
- return count;
+ return res;
}
-static ssize_t pwm_show(struct device *dev, struct device_attribute *dev_attr,
- char *buf)
+static int max6639_read_fan(struct device *dev, u32 attr, int channel,
+ long *fan_val)
{
- struct sensor_device_attribute *attr = to_sensor_dev_attr(dev_attr);
struct max6639_data *data = dev_get_drvdata(dev);
unsigned int val;
int res;
- res = regmap_read(data->regmap, MAX6639_REG_TARGTDUTY(attr->index), &val);
- if (res < 0)
- return res;
+ switch (attr) {
+ case hwmon_fan_input:
+ res = regmap_read(data->regmap, MAX6639_REG_FAN_CNT(channel), &val);
+ if (res < 0)
+ return res;
+ *fan_val = FAN_FROM_REG(val, data->rpm_range[channel]);
+ return 0;
+ case hwmon_fan_fault:
+ res = max6639_get_status(dev, &val);
+ if (res < 0)
+ return res;
+ *fan_val = !!(val & BIT(1 - channel));
+ return 0;
+ default:
+ return -EOPNOTSUPP;
+ }
+}
+
+static int max6639_set_ppr(struct max6639_data *data, int channel, u8 ppr)
+{
+ /* Decrement the PPR value and shift left by 6 to match the register format */
+ return regmap_write(data->regmap, MAX6639_REG_FAN_PPR(channel), ppr-- << 6);
+}
- return sprintf(buf, "%d\n", val * 255 / 120);
+static umode_t max6639_fan_is_visible(const void *_data, u32 attr, int channel)
+{
+ switch (attr) {
+ case hwmon_fan_input:
+ case hwmon_fan_fault:
+ return 0444;
+ case hwmon_fan_pulses:
+ return 0644;
+ default:
+ return 0;
+ }
}
-static ssize_t pwm_store(struct device *dev,
- struct device_attribute *dev_attr, const char *buf,
- size_t count)
+static int max6639_read_pwm(struct device *dev, u32 attr, int channel,
+ long *pwm_val)
{
- struct sensor_device_attribute *attr = to_sensor_dev_attr(dev_attr);
struct max6639_data *data = dev_get_drvdata(dev);
- unsigned long val;
+ unsigned int val;
int res;
- res = kstrtoul(buf, 10, &val);
- if (res)
- return res;
+ switch (attr) {
+ case hwmon_pwm_input:
+ res = regmap_read(data->regmap, MAX6639_REG_TARGTDUTY(channel), &val);
+ if (res < 0)
+ return res;
+ *pwm_val = val * 255 / 120;
+ return 0;
+ default:
+ return -EOPNOTSUPP;
+ }
+}
- val = clamp_val(val, 0, 255);
+static int max6639_write_pwm(struct device *dev, u32 attr, int channel,
+ long val)
+{
+ struct max6639_data *data = dev_get_drvdata(dev);
+ int err;
- regmap_write(data->regmap, MAX6639_REG_TARGTDUTY(attr->index), val * 120 / 255);
+ switch (attr) {
+ case hwmon_pwm_input:
+ val = clamp_val(val, 0, 255);
+ err = regmap_write(data->regmap, MAX6639_REG_TARGTDUTY(channel),
+ val * 120 / 255);
+ return err;
+ default:
+ return -EOPNOTSUPP;
+ }
+}
- return count;
+static umode_t max6639_pwm_is_visible(const void *_data, u32 attr, int channel)
+{
+ switch (attr) {
+ case hwmon_pwm_input:
+ return 0644;
+ default:
+ return 0;
+ }
}
-static ssize_t fan_input_show(struct device *dev,
- struct device_attribute *dev_attr, char *buf)
+static int max6639_read_temp(struct device *dev, u32 attr, int channel,
+ long *val)
{
- struct max6639_data *data = dev_get_drvdata(dev);
- struct sensor_device_attribute *attr = to_sensor_dev_attr(dev_attr);
- unsigned int val;
+ unsigned int status;
int res;
- res = regmap_read(data->regmap, MAX6639_REG_FAN_CNT(attr->index), &val);
- if (res < 0)
+ switch (attr) {
+ case hwmon_temp_input:
+ res = max6639_temp_read_input(dev, channel, val);
return res;
-
- return sprintf(buf, "%d\n", FAN_FROM_REG(val, data->rpm_range));
+ case hwmon_temp_fault:
+ res = max6639_temp_read_fault(dev, channel, val);
+ return res;
+ case hwmon_temp_max:
+ res = max6639_temp_read_max(dev, channel, val);
+ return res;
+ case hwmon_temp_crit:
+ res = max6639_temp_read_crit(dev, channel, val);
+ return res;
+ case hwmon_temp_emergency:
+ res = max6639_temp_read_emergency(dev, channel, val);
+ return res;
+ case hwmon_temp_max_alarm:
+ res = max6639_get_status(dev, &status);
+ if (res < 0)
+ return res;
+ *val = !!(status & BIT(3 - channel));
+ return 0;
+ case hwmon_temp_crit_alarm:
+ res = max6639_get_status(dev, &status);
+ if (res < 0)
+ return res;
+ *val = !!(status & BIT(7 - channel));
+ return 0;
+ case hwmon_temp_emergency_alarm:
+ res = max6639_get_status(dev, &status);
+ if (res < 0)
+ return res;
+ *val = !!(status & BIT(5 - channel));
+ return 0;
+ default:
+ return -EOPNOTSUPP;
+ }
}
-static ssize_t alarm_show(struct device *dev,
- struct device_attribute *dev_attr, char *buf)
+static int max6639_write_temp(struct device *dev, u32 attr, int channel,
+ long val)
{
struct max6639_data *data = dev_get_drvdata(dev);
- struct sensor_device_attribute *attr = to_sensor_dev_attr(dev_attr);
- unsigned int val;
- int res;
- res = regmap_read(data->regmap, MAX6639_REG_STATUS, &val);
- if (res < 0)
- return res;
+ switch (attr) {
+ case hwmon_temp_max:
+ return max6639_temp_set_max(data, channel, val);
+ case hwmon_temp_crit:
+ return max6639_temp_set_crit(data, channel, val);
+ case hwmon_temp_emergency:
+ return max6639_temp_set_emergency(data, channel, val);
+ default:
+ return -EOPNOTSUPP;
+ }
+}
- return sprintf(buf, "%d\n", !!(val & (1 << attr->index)));
+static umode_t max6639_temp_is_visible(const void *_data, u32 attr, int channel)
+{
+ switch (attr) {
+ case hwmon_temp_input:
+ case hwmon_temp_fault:
+ case hwmon_temp_max_alarm:
+ case hwmon_temp_crit_alarm:
+ case hwmon_temp_emergency_alarm:
+ return 0444;
+ case hwmon_temp_max:
+ case hwmon_temp_crit:
+ case hwmon_temp_emergency:
+ return 0644;
+ default:
+ return 0;
+ }
}
-static SENSOR_DEVICE_ATTR_RO(temp1_input, temp_input, 0);
-static SENSOR_DEVICE_ATTR_RO(temp2_input, temp_input, 1);
-static SENSOR_DEVICE_ATTR_RO(temp1_fault, temp_fault, 0);
-static SENSOR_DEVICE_ATTR_RO(temp2_fault, temp_fault, 1);
-static SENSOR_DEVICE_ATTR_RW(temp1_max, temp_max, 0);
-static SENSOR_DEVICE_ATTR_RW(temp2_max, temp_max, 1);
-static SENSOR_DEVICE_ATTR_RW(temp1_crit, temp_crit, 0);
-static SENSOR_DEVICE_ATTR_RW(temp2_crit, temp_crit, 1);
-static SENSOR_DEVICE_ATTR_RW(temp1_emergency, temp_emergency, 0);
-static SENSOR_DEVICE_ATTR_RW(temp2_emergency, temp_emergency, 1);
-static SENSOR_DEVICE_ATTR_RW(pwm1, pwm, 0);
-static SENSOR_DEVICE_ATTR_RW(pwm2, pwm, 1);
-static SENSOR_DEVICE_ATTR_RO(fan1_input, fan_input, 0);
-static SENSOR_DEVICE_ATTR_RO(fan2_input, fan_input, 1);
-static SENSOR_DEVICE_ATTR_RO(fan1_fault, alarm, 1);
-static SENSOR_DEVICE_ATTR_RO(fan2_fault, alarm, 0);
-static SENSOR_DEVICE_ATTR_RO(temp1_max_alarm, alarm, 3);
-static SENSOR_DEVICE_ATTR_RO(temp2_max_alarm, alarm, 2);
-static SENSOR_DEVICE_ATTR_RO(temp1_crit_alarm, alarm, 7);
-static SENSOR_DEVICE_ATTR_RO(temp2_crit_alarm, alarm, 6);
-static SENSOR_DEVICE_ATTR_RO(temp1_emergency_alarm, alarm, 5);
-static SENSOR_DEVICE_ATTR_RO(temp2_emergency_alarm, alarm, 4);
-
-
-static struct attribute *max6639_attrs[] = {
- &sensor_dev_attr_temp1_input.dev_attr.attr,
- &sensor_dev_attr_temp2_input.dev_attr.attr,
- &sensor_dev_attr_temp1_fault.dev_attr.attr,
- &sensor_dev_attr_temp2_fault.dev_attr.attr,
- &sensor_dev_attr_temp1_max.dev_attr.attr,
- &sensor_dev_attr_temp2_max.dev_attr.attr,
- &sensor_dev_attr_temp1_crit.dev_attr.attr,
- &sensor_dev_attr_temp2_crit.dev_attr.attr,
- &sensor_dev_attr_temp1_emergency.dev_attr.attr,
- &sensor_dev_attr_temp2_emergency.dev_attr.attr,
- &sensor_dev_attr_pwm1.dev_attr.attr,
- &sensor_dev_attr_pwm2.dev_attr.attr,
- &sensor_dev_attr_fan1_input.dev_attr.attr,
- &sensor_dev_attr_fan2_input.dev_attr.attr,
- &sensor_dev_attr_fan1_fault.dev_attr.attr,
- &sensor_dev_attr_fan2_fault.dev_attr.attr,
- &sensor_dev_attr_temp1_max_alarm.dev_attr.attr,
- &sensor_dev_attr_temp2_max_alarm.dev_attr.attr,
- &sensor_dev_attr_temp1_crit_alarm.dev_attr.attr,
- &sensor_dev_attr_temp2_crit_alarm.dev_attr.attr,
- &sensor_dev_attr_temp1_emergency_alarm.dev_attr.attr,
- &sensor_dev_attr_temp2_emergency_alarm.dev_attr.attr,
+static int max6639_read(struct device *dev, enum hwmon_sensor_types type,
+ u32 attr, int channel, long *val)
+{
+ switch (type) {
+ case hwmon_fan:
+ return max6639_read_fan(dev, attr, channel, val);
+ case hwmon_pwm:
+ return max6639_read_pwm(dev, attr, channel, val);
+ case hwmon_temp:
+ return max6639_read_temp(dev, attr, channel, val);
+ default:
+ return -EOPNOTSUPP;
+ }
+}
+
+static int max6639_write(struct device *dev, enum hwmon_sensor_types type,
+ u32 attr, int channel, long val)
+{
+ switch (type) {
+ case hwmon_pwm:
+ return max6639_write_pwm(dev, attr, channel, val);
+ case hwmon_temp:
+ return max6639_write_temp(dev, attr, channel, val);
+ default:
+ return -EOPNOTSUPP;
+ }
+}
+
+static umode_t max6639_is_visible(const void *data,
+ enum hwmon_sensor_types type,
+ u32 attr, int channel)
+{
+ switch (type) {
+ case hwmon_fan:
+ return max6639_fan_is_visible(data, attr, channel);
+ case hwmon_pwm:
+ return max6639_pwm_is_visible(data, attr, channel);
+ case hwmon_temp:
+ return max6639_temp_is_visible(data, attr, channel);
+ default:
+ return 0;
+ }
+}
+
+static const struct hwmon_channel_info * const max6639_info[] = {
+ HWMON_CHANNEL_INFO(fan,
+ HWMON_F_INPUT | HWMON_F_FAULT,
+ HWMON_F_INPUT | HWMON_F_FAULT),
+ HWMON_CHANNEL_INFO(pwm,
+ HWMON_PWM_INPUT,
+ HWMON_PWM_INPUT),
+ HWMON_CHANNEL_INFO(temp,
+ HWMON_T_INPUT | HWMON_T_FAULT | HWMON_T_MAX | HWMON_T_MAX_ALARM |
+ HWMON_T_CRIT | HWMON_T_CRIT_ALARM | HWMON_T_EMERGENCY |
+ HWMON_T_EMERGENCY_ALARM,
+ HWMON_T_INPUT | HWMON_T_FAULT | HWMON_T_MAX | HWMON_T_MAX_ALARM |
+ HWMON_T_CRIT | HWMON_T_CRIT_ALARM | HWMON_T_EMERGENCY |
+ HWMON_T_EMERGENCY_ALARM),
NULL
};
-ATTRIBUTE_GROUPS(max6639);
+
+static const struct hwmon_ops max6639_hwmon_ops = {
+ .is_visible = max6639_is_visible,
+ .read = max6639_read,
+ .write = max6639_write,
+};
+
+static const struct hwmon_chip_info max6639_chip_info = {
+ .ops = &max6639_hwmon_ops,
+ .info = max6639_info,
+};
/*
* returns respective index in rpm_ranges table
@@ -355,11 +470,6 @@ static int rpm_range_to_reg(int range)
return 1; /* default: 4000 RPM */
}
-static int max6639_set_ppr(struct max6639_data *data, u8 channel, u8 ppr)
-{
- return regmap_write(data->regmap, MAX6639_REG_FAN_PPR(channel), ppr << 6);
-}
-
static int max6639_init_client(struct i2c_client *client,
struct max6639_data *data)
{
@@ -380,30 +490,34 @@ static int max6639_init_client(struct i2c_client *client,
ppr = max6639_info->ppr;
else
ppr = 2;
- ppr -= 1;
+
+ data->ppr[0] = ppr;
+ data->ppr[1] = ppr;
if (max6639_info)
rpm_range = rpm_range_to_reg(max6639_info->rpm_range);
- data->rpm_range = rpm_range;
+ data->rpm_range[0] = rpm_range;
+ data->rpm_range[1] = rpm_range;
for (i = 0; i < MAX6639_NUM_CHANNELS; i++) {
-
/* Set Fan pulse per revolution */
- err = max6639_set_ppr(data, i, ppr);
+ err = max6639_set_ppr(data, i, data->ppr[i]);
if (err)
return err;
/* Fans config PWM, RPM */
err = regmap_write(data->regmap, MAX6639_REG_FAN_CONFIG1(i),
- MAX6639_FAN_CONFIG1_PWM | rpm_range);
+ MAX6639_FAN_CONFIG1_PWM | data->rpm_range[i]);
if (err)
return err;
/* Fans PWM polarity high by default */
- if (max6639_info && max6639_info->pwm_polarity == 0)
- err = regmap_write(data->regmap, MAX6639_REG_FAN_CONFIG2a(i), 0x00);
- else
- err = regmap_write(data->regmap, MAX6639_REG_FAN_CONFIG2a(i), 0x02);
+ if (max6639_info) {
+ if (max6639_info->pwm_polarity == 0)
+ err = regmap_write(data->regmap, MAX6639_REG_FAN_CONFIG2a(i), 0x00);
+ else
+ err = regmap_write(data->regmap, MAX6639_REG_FAN_CONFIG2a(i), 0x02);
+ }
if (err)
return err;
@@ -534,9 +648,10 @@ static int max6639_probe(struct i2c_client *client)
if (err < 0)
return err;
- hwmon_dev = devm_hwmon_device_register_with_groups(dev, client->name,
- data,
- max6639_groups);
+ hwmon_dev = devm_hwmon_device_register_with_info(dev, client->name,
+ data, &max6639_chip_info,
+ NULL);
+
return PTR_ERR_OR_ZERO(hwmon_dev);
}
Update hwmon init with info instead of group. The hwmon info structure in more flexible to describe sensor attribute & easy to maintian. Signed-off-by: Naresh Solanki <naresh.solanki@9elements.com> --- Changes in v5: - Update set function parameter to type 'long' to prevent underflow. - remove unnecessary IS_ERR check - remove unused variable Changes in v4: - Change res type from unsigned to signed Changes in V3: - return 0 when 'res' variable is known zero. - Handle errors first before assigning results - Use BIT to make it easier to read. - Remove error message print on user input - Return err value instead of printing error message & returing zero. - Remove variable declaration in switch case statement - Use find_closest instead of for loop - Remove pointless assignment & check - Seperate patch for adding additional attributes --- drivers/hwmon/max6639.c | 457 +++++++++++++++++++++++++--------------- 1 file changed, 286 insertions(+), 171 deletions(-) base-commit: 52115fc32905c0bacc244f1dace9a138518df0de