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path: root/drivers/hwmon/max6650.c
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Diffstat (limited to 'drivers/hwmon/max6650.c')
-rw-r--r--drivers/hwmon/max6650.c710
1 files changed, 356 insertions, 354 deletions
diff --git a/drivers/hwmon/max6650.c b/drivers/hwmon/max6650.c
index 6b9056f9483f..3d9d371c35b5 100644
--- a/drivers/hwmon/max6650.c
+++ b/drivers/hwmon/max6650.c
@@ -92,7 +92,8 @@ module_param(clock, int, 0444);
#define FAN_RPM_MIN 240
#define FAN_RPM_MAX 30000
-#define DIV_FROM_REG(reg) (1 << (reg & 7))
+#define DIV_FROM_REG(reg) (1 << ((reg) & 7))
+#define DAC_LIMIT(v12) ((v12) ? 180 : 76)
/*
* Client data (each client gets its own)
@@ -100,11 +101,9 @@ module_param(clock, int, 0444);
struct max6650_data {
struct i2c_client *client;
- const struct attribute_group *groups[3];
- struct thermal_cooling_device *cooling_dev;
- struct mutex update_lock;
+ struct mutex update_lock; /* protect alarm register updates */
int nr_fans;
- char valid; /* zero until following fields are valid */
+ bool valid; /* false until following fields are valid */
unsigned long last_updated; /* in jiffies */
/* register values */
@@ -114,6 +113,7 @@ struct max6650_data {
u8 count;
u8 dac;
u8 alarm;
+ u8 alarm_en;
unsigned long cooling_dev_state;
};
@@ -137,41 +137,60 @@ static const struct of_device_id __maybe_unused max6650_dt_match[] = {
};
MODULE_DEVICE_TABLE(of, max6650_dt_match);
+static int dac_to_pwm(int dac, bool v12)
+{
+ /*
+ * Useful range for dac is 0-180 for 12V fans and 0-76 for 5V fans.
+ * Lower DAC values mean higher speeds.
+ */
+ return clamp_val(255 - (255 * dac) / DAC_LIMIT(v12), 0, 255);
+}
+
+static u8 pwm_to_dac(unsigned int pwm, bool v12)
+{
+ int limit = DAC_LIMIT(v12);
+
+ return limit - (limit * pwm) / 255;
+}
+
static struct max6650_data *max6650_update_device(struct device *dev)
{
struct max6650_data *data = dev_get_drvdata(dev);
struct i2c_client *client = data->client;
+ int reg, err = 0;
int i;
mutex_lock(&data->update_lock);
if (time_after(jiffies, data->last_updated + HZ) || !data->valid) {
- data->speed = i2c_smbus_read_byte_data(client,
- MAX6650_REG_SPEED);
- data->config = i2c_smbus_read_byte_data(client,
- MAX6650_REG_CONFIG);
for (i = 0; i < data->nr_fans; i++) {
- data->tach[i] = i2c_smbus_read_byte_data(client,
- tach_reg[i]);
+ reg = i2c_smbus_read_byte_data(client, tach_reg[i]);
+ if (reg < 0) {
+ err = reg;
+ goto error;
+ }
+ data->tach[i] = reg;
}
- data->count = i2c_smbus_read_byte_data(client,
- MAX6650_REG_COUNT);
- data->dac = i2c_smbus_read_byte_data(client, MAX6650_REG_DAC);
/*
* Alarms are cleared on read in case the condition that
* caused the alarm is removed. Keep the value latched here
* for providing the register through different alarm files.
*/
- data->alarm |= i2c_smbus_read_byte_data(client,
- MAX6650_REG_ALARM);
-
+ reg = i2c_smbus_read_byte_data(client, MAX6650_REG_ALARM);
+ if (reg < 0) {
+ err = reg;
+ goto error;
+ }
+ data->alarm |= reg;
data->last_updated = jiffies;
- data->valid = 1;
+ data->valid = true;
}
+error:
mutex_unlock(&data->update_lock);
-
+ if (err)
+ data = ERR_PTR(err);
return data;
}
@@ -199,26 +218,6 @@ static int max6650_set_operating_mode(struct max6650_data *data, u8 mode)
return 0;
}
-static ssize_t fan_show(struct device *dev, struct device_attribute *devattr,
- char *buf)
-{
- struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
- struct max6650_data *data = max6650_update_device(dev);
- int rpm;
-
- /*
- * Calculation details:
- *
- * Each tachometer counts over an interval given by the "count"
- * register (0.25, 0.5, 1 or 2 seconds). This module assumes
- * that the fans produce two pulses per revolution (this seems
- * to be the most common).
- */
-
- rpm = ((data->tach[attr->index] * 120) / DIV_FROM_REG(data->count));
- return sprintf(buf, "%d\n", rpm);
-}
-
/*
* Set the fan speed to the specified RPM (or read back the RPM setting).
* This works in closed loop mode only. Use pwm1 for open loop speed setting.
@@ -260,26 +259,6 @@ static ssize_t fan_show(struct device *dev, struct device_attribute *devattr,
* controlled.
*/
-static ssize_t fan1_target_show(struct device *dev,
- struct device_attribute *devattr, char *buf)
-{
- struct max6650_data *data = max6650_update_device(dev);
- int kscale, ktach, rpm;
-
- /*
- * Use the datasheet equation:
- *
- * FanSpeed = KSCALE x fCLK / [256 x (KTACH + 1)]
- *
- * then multiply by 60 to give rpm.
- */
-
- kscale = DIV_FROM_REG(data->config);
- ktach = data->speed;
- rpm = 60 * kscale * clock / (256 * (ktach + 1));
- return sprintf(buf, "%d\n", rpm);
-}
-
static int max6650_set_target(struct max6650_data *data, unsigned long rpm)
{
int kscale, ktach;
@@ -308,197 +287,8 @@ static int max6650_set_target(struct max6650_data *data, unsigned long rpm)
data->speed);
}
-static ssize_t fan1_target_store(struct device *dev,
- struct device_attribute *devattr,
- const char *buf, size_t count)
-{
- struct max6650_data *data = dev_get_drvdata(dev);
- unsigned long rpm;
- int err;
-
- err = kstrtoul(buf, 10, &rpm);
- if (err)
- return err;
-
- mutex_lock(&data->update_lock);
-
- err = max6650_set_target(data, rpm);
-
- mutex_unlock(&data->update_lock);
-
- if (err < 0)
- return err;
-
- return count;
-}
-
-/*
- * Get/set the fan speed in open loop mode using pwm1 sysfs file.
- * Speed is given as a relative value from 0 to 255, where 255 is maximum
- * speed. Note that this is done by writing directly to the chip's DAC,
- * it won't change the closed loop speed set by fan1_target.
- * Also note that due to rounding errors it is possible that you don't read
- * back exactly the value you have set.
- */
-
-static ssize_t pwm1_show(struct device *dev, struct device_attribute *devattr,
- char *buf)
-{
- int pwm;
- struct max6650_data *data = max6650_update_device(dev);
-
- /*
- * Useful range for dac is 0-180 for 12V fans and 0-76 for 5V fans.
- * Lower DAC values mean higher speeds.
- */
- if (data->config & MAX6650_CFG_V12)
- pwm = 255 - (255 * (int)data->dac)/180;
- else
- pwm = 255 - (255 * (int)data->dac)/76;
-
- if (pwm < 0)
- pwm = 0;
-
- return sprintf(buf, "%d\n", pwm);
-}
-
-static ssize_t pwm1_store(struct device *dev,
- struct device_attribute *devattr, const char *buf,
- size_t count)
-{
- struct max6650_data *data = dev_get_drvdata(dev);
- struct i2c_client *client = data->client;
- unsigned long pwm;
- int err;
-
- err = kstrtoul(buf, 10, &pwm);
- if (err)
- return err;
-
- pwm = clamp_val(pwm, 0, 255);
-
- mutex_lock(&data->update_lock);
-
- if (data->config & MAX6650_CFG_V12)
- data->dac = 180 - (180 * pwm)/255;
- else
- data->dac = 76 - (76 * pwm)/255;
- err = i2c_smbus_write_byte_data(client, MAX6650_REG_DAC, data->dac);
-
- mutex_unlock(&data->update_lock);
-
- return err < 0 ? err : count;
-}
-
/*
- * Get/Set controller mode:
- * Possible values:
- * 0 = Fan always on
- * 1 = Open loop, Voltage is set according to speed, not regulated.
- * 2 = Closed loop, RPM for all fans regulated by fan1 tachometer
- * 3 = Fan off
- */
-static ssize_t pwm1_enable_show(struct device *dev,
- struct device_attribute *devattr, char *buf)
-{
- struct max6650_data *data = max6650_update_device(dev);
- int mode = (data->config & MAX6650_CFG_MODE_MASK) >> 4;
- int sysfs_modes[4] = {0, 3, 2, 1};
-
- return sprintf(buf, "%d\n", sysfs_modes[mode]);
-}
-
-static ssize_t pwm1_enable_store(struct device *dev,
- struct device_attribute *devattr,
- const char *buf, size_t count)
-{
- struct max6650_data *data = dev_get_drvdata(dev);
- unsigned long mode;
- int err;
- const u8 max6650_modes[] = {
- MAX6650_CFG_MODE_ON,
- MAX6650_CFG_MODE_OPEN_LOOP,
- MAX6650_CFG_MODE_CLOSED_LOOP,
- MAX6650_CFG_MODE_OFF,
- };
-
- err = kstrtoul(buf, 10, &mode);
- if (err)
- return err;
-
- if (mode >= ARRAY_SIZE(max6650_modes))
- return -EINVAL;
-
- mutex_lock(&data->update_lock);
-
- max6650_set_operating_mode(data, max6650_modes[mode]);
-
- mutex_unlock(&data->update_lock);
-
- return count;
-}
-
-/*
- * Read/write functions for fan1_div sysfs file. The MAX6650 has no such
- * divider. We handle this by converting between divider and counttime:
- *
- * (counttime == k) <==> (divider == 2^k), k = 0, 1, 2, or 3
- *
- * Lower values of k allow to connect a faster fan without the risk of
- * counter overflow. The price is lower resolution. You can also set counttime
- * using the module parameter. Note that the module parameter "prescaler" also
- * influences the behaviour. Unfortunately, there's no sysfs attribute
- * defined for that. See the data sheet for details.
- */
-
-static ssize_t fan1_div_show(struct device *dev,
- struct device_attribute *devattr, char *buf)
-{
- struct max6650_data *data = max6650_update_device(dev);
-
- return sprintf(buf, "%d\n", DIV_FROM_REG(data->count));
-}
-
-static ssize_t fan1_div_store(struct device *dev,
- struct device_attribute *devattr,
- const char *buf, size_t count)
-{
- struct max6650_data *data = dev_get_drvdata(dev);
- struct i2c_client *client = data->client;
- unsigned long div;
- int err;
-
- err = kstrtoul(buf, 10, &div);
- if (err)
- return err;
-
- mutex_lock(&data->update_lock);
- switch (div) {
- case 1:
- data->count = 0;
- break;
- case 2:
- data->count = 1;
- break;
- case 4:
- data->count = 2;
- break;
- case 8:
- data->count = 3;
- break;
- default:
- mutex_unlock(&data->update_lock);
- return -EINVAL;
- }
-
- i2c_smbus_write_byte_data(client, MAX6650_REG_COUNT, data->count);
- mutex_unlock(&data->update_lock);
-
- return count;
-}
-
-/*
- * Get alarm stati:
+ * Get gpio alarm status:
* Possible values:
* 0 = no alarm
* 1 = alarm
@@ -509,42 +299,30 @@ static ssize_t alarm_show(struct device *dev,
{
struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
struct max6650_data *data = max6650_update_device(dev);
- struct i2c_client *client = data->client;
- int alarm = 0;
+ bool alarm;
- if (data->alarm & attr->index) {
+ if (IS_ERR(data))
+ return PTR_ERR(data);
+
+ alarm = data->alarm & attr->index;
+ if (alarm) {
mutex_lock(&data->update_lock);
- alarm = 1;
data->alarm &= ~attr->index;
- data->alarm |= i2c_smbus_read_byte_data(client,
- MAX6650_REG_ALARM);
+ data->valid = false;
mutex_unlock(&data->update_lock);
}
return sprintf(buf, "%d\n", alarm);
}
-static SENSOR_DEVICE_ATTR_RO(fan1_input, fan, 0);
-static SENSOR_DEVICE_ATTR_RO(fan2_input, fan, 1);
-static SENSOR_DEVICE_ATTR_RO(fan3_input, fan, 2);
-static SENSOR_DEVICE_ATTR_RO(fan4_input, fan, 3);
-static DEVICE_ATTR_RW(fan1_target);
-static DEVICE_ATTR_RW(fan1_div);
-static DEVICE_ATTR_RW(pwm1_enable);
-static DEVICE_ATTR_RW(pwm1);
-static SENSOR_DEVICE_ATTR_RO(fan1_max_alarm, alarm, MAX6650_ALRM_MAX);
-static SENSOR_DEVICE_ATTR_RO(fan1_min_alarm, alarm, MAX6650_ALRM_MIN);
-static SENSOR_DEVICE_ATTR_RO(fan1_fault, alarm, MAX6650_ALRM_TACH);
static SENSOR_DEVICE_ATTR_RO(gpio1_alarm, alarm, MAX6650_ALRM_GPIO1);
static SENSOR_DEVICE_ATTR_RO(gpio2_alarm, alarm, MAX6650_ALRM_GPIO2);
static umode_t max6650_attrs_visible(struct kobject *kobj, struct attribute *a,
- int n)
+ int n)
{
struct device *dev = container_of(kobj, struct device, kobj);
struct max6650_data *data = dev_get_drvdata(dev);
- struct i2c_client *client = data->client;
- u8 alarm_en = i2c_smbus_read_byte_data(client, MAX6650_REG_ALARM_EN);
struct device_attribute *devattr;
/*
@@ -552,12 +330,9 @@ static umode_t max6650_attrs_visible(struct kobject *kobj, struct attribute *a,
*/
devattr = container_of(a, struct device_attribute, attr);
- if (devattr == &sensor_dev_attr_fan1_max_alarm.dev_attr
- || devattr == &sensor_dev_attr_fan1_min_alarm.dev_attr
- || devattr == &sensor_dev_attr_fan1_fault.dev_attr
- || devattr == &sensor_dev_attr_gpio1_alarm.dev_attr
- || devattr == &sensor_dev_attr_gpio2_alarm.dev_attr) {
- if (!(alarm_en & to_sensor_dev_attr(devattr)->index))
+ if (devattr == &sensor_dev_attr_gpio1_alarm.dev_attr ||
+ devattr == &sensor_dev_attr_gpio2_alarm.dev_attr) {
+ if (!(data->alarm_en & to_sensor_dev_attr(devattr)->index))
return 0;
}
@@ -565,14 +340,6 @@ static umode_t max6650_attrs_visible(struct kobject *kobj, struct attribute *a,
}
static struct attribute *max6650_attrs[] = {
- &sensor_dev_attr_fan1_input.dev_attr.attr,
- &dev_attr_fan1_target.attr,
- &dev_attr_fan1_div.attr,
- &dev_attr_pwm1_enable.attr,
- &dev_attr_pwm1.attr,
- &sensor_dev_attr_fan1_max_alarm.dev_attr.attr,
- &sensor_dev_attr_fan1_min_alarm.dev_attr.attr,
- &sensor_dev_attr_fan1_fault.dev_attr.attr,
&sensor_dev_attr_gpio1_alarm.dev_attr.attr,
&sensor_dev_attr_gpio2_alarm.dev_attr.attr,
NULL
@@ -583,27 +350,17 @@ static const struct attribute_group max6650_group = {
.is_visible = max6650_attrs_visible,
};
-static struct attribute *max6651_attrs[] = {
- &sensor_dev_attr_fan2_input.dev_attr.attr,
- &sensor_dev_attr_fan3_input.dev_attr.attr,
- &sensor_dev_attr_fan4_input.dev_attr.attr,
+static const struct attribute_group *max6650_groups[] = {
+ &max6650_group,
NULL
};
-static const struct attribute_group max6651_group = {
- .attrs = max6651_attrs,
-};
-
-/*
- * Real code
- */
-
static int max6650_init_client(struct max6650_data *data,
struct i2c_client *client)
{
struct device *dev = &client->dev;
- int config;
- int err = -EIO;
+ int reg;
+ int err;
u32 voltage;
u32 prescale;
u32 target_rpm;
@@ -617,21 +374,20 @@ static int max6650_init_client(struct max6650_data *data,
&prescale))
prescale = prescaler;
- config = i2c_smbus_read_byte_data(client, MAX6650_REG_CONFIG);
-
- if (config < 0) {
- dev_err(dev, "Error reading config, aborting.\n");
- return err;
+ reg = i2c_smbus_read_byte_data(client, MAX6650_REG_CONFIG);
+ if (reg < 0) {
+ dev_err(dev, "Error reading config register, aborting.\n");
+ return reg;
}
switch (voltage) {
case 0:
break;
case 5:
- config &= ~MAX6650_CFG_V12;
+ reg &= ~MAX6650_CFG_V12;
break;
case 12:
- config |= MAX6650_CFG_V12;
+ reg |= MAX6650_CFG_V12;
break;
default:
dev_err(dev, "illegal value for fan_voltage (%d)\n", voltage);
@@ -641,22 +397,22 @@ static int max6650_init_client(struct max6650_data *data,
case 0:
break;
case 1:
- config &= ~MAX6650_CFG_PRESCALER_MASK;
+ reg &= ~MAX6650_CFG_PRESCALER_MASK;
break;
case 2:
- config = (config & ~MAX6650_CFG_PRESCALER_MASK)
+ reg = (reg & ~MAX6650_CFG_PRESCALER_MASK)
| MAX6650_CFG_PRESCALER_2;
break;
case 4:
- config = (config & ~MAX6650_CFG_PRESCALER_MASK)
+ reg = (reg & ~MAX6650_CFG_PRESCALER_MASK)
| MAX6650_CFG_PRESCALER_4;
break;
case 8:
- config = (config & ~MAX6650_CFG_PRESCALER_MASK)
+ reg = (reg & ~MAX6650_CFG_PRESCALER_MASK)
| MAX6650_CFG_PRESCALER_8;
break;
case 16:
- config = (config & ~MAX6650_CFG_PRESCALER_MASK)
+ reg = (reg & ~MAX6650_CFG_PRESCALER_MASK)
| MAX6650_CFG_PRESCALER_16;
break;
default:
@@ -664,16 +420,43 @@ static int max6650_init_client(struct max6650_data *data,
}
dev_info(dev, "Fan voltage: %dV, prescaler: %d.\n",
- (config & MAX6650_CFG_V12) ? 12 : 5,
- 1 << (config & MAX6650_CFG_PRESCALER_MASK));
+ (reg & MAX6650_CFG_V12) ? 12 : 5,
+ 1 << (reg & MAX6650_CFG_PRESCALER_MASK));
- if (i2c_smbus_write_byte_data(client, MAX6650_REG_CONFIG, config)) {
+ err = i2c_smbus_write_byte_data(client, MAX6650_REG_CONFIG, reg);
+ if (err) {
dev_err(dev, "Config write error, aborting.\n");
return err;
}
+ data->config = reg;
- data->config = config;
- data->count = i2c_smbus_read_byte_data(client, MAX6650_REG_COUNT);
+ reg = i2c_smbus_read_byte_data(client, MAX6650_REG_SPEED);
+ if (reg < 0) {
+ dev_err(dev, "Failed to read speed register, aborting.\n");
+ return reg;
+ }
+ data->speed = reg;
+
+ reg = i2c_smbus_read_byte_data(client, MAX6650_REG_DAC);
+ if (reg < 0) {
+ dev_err(dev, "Failed to read DAC register, aborting.\n");
+ return reg;
+ }
+ data->dac = reg;
+
+ reg = i2c_smbus_read_byte_data(client, MAX6650_REG_COUNT);
+ if (reg < 0) {
+ dev_err(dev, "Failed to read count register, aborting.\n");
+ return reg;
+ }
+ data->count = reg;
+
+ reg = i2c_smbus_read_byte_data(client, MAX6650_REG_ALARM_EN);
+ if (reg < 0) {
+ dev_err(dev, "Failed to read alarm configuration, aborting.\n");
+ return reg;
+ }
+ data->alarm_en = reg;
if (!of_property_read_u32(client->dev.of_node, "maxim,fan-target-rpm",
&target_rpm)) {
@@ -684,8 +467,6 @@ static int max6650_init_client(struct max6650_data *data,
return 0;
}
-#if IS_ENABLED(CONFIG_THERMAL)
-
static int max6650_get_max_state(struct thermal_cooling_device *cdev,
unsigned long *state)
{
@@ -715,23 +496,18 @@ static int max6650_set_cur_state(struct thermal_cooling_device *cdev,
mutex_lock(&data->update_lock);
- if (data->config & MAX6650_CFG_V12)
- data->dac = 180 - (180 * state)/255;
- else
- data->dac = 76 - (76 * state)/255;
-
+ data->dac = pwm_to_dac(state, data->config & MAX6650_CFG_V12);
err = i2c_smbus_write_byte_data(client, MAX6650_REG_DAC, data->dac);
-
if (!err) {
max6650_set_operating_mode(data, state ?
- MAX6650_CFG_MODE_OPEN_LOOP :
- MAX6650_CFG_MODE_OFF);
+ MAX6650_CFG_MODE_OPEN_LOOP :
+ MAX6650_CFG_MODE_OFF);
data->cooling_dev_state = state;
}
mutex_unlock(&data->update_lock);
- return err < 0 ? err : 0;
+ return err;
}
static const struct thermal_cooling_device_ops max6650_cooling_ops = {
@@ -739,11 +515,252 @@ static const struct thermal_cooling_device_ops max6650_cooling_ops = {
.get_cur_state = max6650_get_cur_state,
.set_cur_state = max6650_set_cur_state,
};
-#endif
+
+static int max6650_read(struct device *dev, enum hwmon_sensor_types type,
+ u32 attr, int channel, long *val)
+{
+ struct max6650_data *data = max6650_update_device(dev);
+ int mode;
+
+ if (IS_ERR(data))
+ return PTR_ERR(data);
+
+ switch (type) {
+ case hwmon_pwm:
+ switch (attr) {
+ case hwmon_pwm_input:
+ *val = dac_to_pwm(data->dac,
+ data->config & MAX6650_CFG_V12);
+ break;
+ case hwmon_pwm_enable:
+ /*
+ * Possible values:
+ * 0 = Fan always on
+ * 1 = Open loop, Voltage is set according to speed,
+ * not regulated.
+ * 2 = Closed loop, RPM for all fans regulated by fan1
+ * tachometer
+ * 3 = Fan off
+ */
+ mode = (data->config & MAX6650_CFG_MODE_MASK) >> 4;
+ *val = (4 - mode) & 3; /* {0 1 2 3} -> {0 3 2 1} */
+ break;
+ default:
+ return -EOPNOTSUPP;
+ }
+ break;
+ case hwmon_fan:
+ switch (attr) {
+ case hwmon_fan_input:
+ /*
+ * Calculation details:
+ *
+ * Each tachometer counts over an interval given by the
+ * "count" register (0.25, 0.5, 1 or 2 seconds).
+ * The driver assumes that the fans produce two pulses
+ * per revolution (this seems to be the most common).
+ */
+ *val = DIV_ROUND_CLOSEST(data->tach[channel] * 120,
+ DIV_FROM_REG(data->count));
+ break;
+ case hwmon_fan_div:
+ *val = DIV_FROM_REG(data->count);
+ break;
+ case hwmon_fan_target:
+ /*
+ * Use the datasheet equation:
+ * FanSpeed = KSCALE x fCLK / [256 x (KTACH + 1)]
+ * then multiply by 60 to give rpm.
+ */
+ *val = 60 * DIV_FROM_REG(data->config) * clock /
+ (256 * (data->speed + 1));
+ break;
+ case hwmon_fan_min_alarm:
+ *val = !!(data->alarm & MAX6650_ALRM_MIN);
+ data->alarm &= ~MAX6650_ALRM_MIN;
+ data->valid = false;
+ break;
+ case hwmon_fan_max_alarm:
+ *val = !!(data->alarm & MAX6650_ALRM_MAX);
+ data->alarm &= ~MAX6650_ALRM_MAX;
+ data->valid = false;
+ break;
+ case hwmon_fan_fault:
+ *val = !!(data->alarm & MAX6650_ALRM_TACH);
+ data->alarm &= ~MAX6650_ALRM_TACH;
+ data->valid = false;
+ break;
+ default:
+ return -EOPNOTSUPP;
+ }
+ break;
+ default:
+ return -EOPNOTSUPP;
+ }
+ return 0;
+}
+
+static const u8 max6650_pwm_modes[] = {
+ MAX6650_CFG_MODE_ON,
+ MAX6650_CFG_MODE_OPEN_LOOP,
+ MAX6650_CFG_MODE_CLOSED_LOOP,
+ MAX6650_CFG_MODE_OFF,
+};
+
+static int max6650_write(struct device *dev, enum hwmon_sensor_types type,
+ u32 attr, int channel, long val)
+{
+ struct max6650_data *data = dev_get_drvdata(dev);
+ int ret = 0;
+ u8 reg;
+
+ mutex_lock(&data->update_lock);
+
+ switch (type) {
+ case hwmon_pwm:
+ switch (attr) {
+ case hwmon_pwm_input:
+ reg = pwm_to_dac(clamp_val(val, 0, 255),
+ data->config & MAX6650_CFG_V12);
+ ret = i2c_smbus_write_byte_data(data->client,
+ MAX6650_REG_DAC, reg);
+ if (ret)
+ break;
+ data->dac = reg;
+ break;
+ case hwmon_pwm_enable:
+ if (val < 0 || val >= ARRAY_SIZE(max6650_pwm_modes)) {
+ ret = -EINVAL;
+ break;
+ }
+ ret = max6650_set_operating_mode(data,
+ max6650_pwm_modes[val]);
+ break;
+ default:
+ ret = -EOPNOTSUPP;
+ break;
+ }
+ break;
+ case hwmon_fan:
+ switch (attr) {
+ case hwmon_fan_div:
+ switch (val) {
+ case 1:
+ reg = 0;
+ break;
+ case 2:
+ reg = 1;
+ break;
+ case 4:
+ reg = 2;
+ break;
+ case 8:
+ reg = 3;
+ break;
+ default:
+ ret = -EINVAL;
+ goto error;
+ }
+ ret = i2c_smbus_write_byte_data(data->client,
+ MAX6650_REG_COUNT, reg);
+ if (ret)
+ break;
+ data->count = reg;
+ break;
+ case hwmon_fan_target:
+ if (val < 0) {
+ ret = -EINVAL;
+ break;
+ }
+ ret = max6650_set_target(data, val);
+ break;
+ default:
+ ret = -EOPNOTSUPP;
+ break;
+ }
+ break;
+ default:
+ ret = -EOPNOTSUPP;
+ break;
+ }
+
+error:
+ mutex_unlock(&data->update_lock);
+ return ret;
+}
+
+static umode_t max6650_is_visible(const void *_data,
+ enum hwmon_sensor_types type, u32 attr,
+ int channel)
+{
+ const struct max6650_data *data = _data;
+
+ if (channel && (channel >= data->nr_fans || type != hwmon_fan))
+ return 0;
+
+ switch (type) {
+ case hwmon_fan:
+ switch (attr) {
+ case hwmon_fan_input:
+ return 0444;
+ case hwmon_fan_target:
+ case hwmon_fan_div:
+ return 0644;
+ case hwmon_fan_min_alarm:
+ if (data->alarm_en & MAX6650_ALRM_MIN)
+ return 0444;
+ break;
+ case hwmon_fan_max_alarm:
+ if (data->alarm_en & MAX6650_ALRM_MAX)
+ return 0444;
+ break;
+ case hwmon_fan_fault:
+ if (data->alarm_en & MAX6650_ALRM_TACH)
+ return 0444;
+ break;
+ default:
+ break;
+ }
+ break;
+ case hwmon_pwm:
+ switch (attr) {
+ case hwmon_pwm_input:
+ case hwmon_pwm_enable:
+ return 0644;
+ default:
+ break;
+ }
+ break;
+ default:
+ break;
+ }
+ return 0;
+}
+
+static const struct hwmon_channel_info *max6650_info[] = {
+ HWMON_CHANNEL_INFO(fan, HWMON_F_INPUT | HWMON_F_TARGET | HWMON_F_DIV |
+ HWMON_F_MIN_ALARM | HWMON_F_MAX_ALARM |
+ HWMON_F_FAULT,
+ HWMON_F_INPUT, HWMON_F_INPUT, HWMON_F_INPUT),
+ HWMON_CHANNEL_INFO(pwm, HWMON_PWM_INPUT | HWMON_PWM_ENABLE),
+ NULL
+};
+
+static const struct hwmon_ops max6650_hwmon_ops = {
+ .read = max6650_read,
+ .write = max6650_write,
+ .is_visible = max6650_is_visible,
+};
+
+static const struct hwmon_chip_info max6650_chip_info = {
+ .ops = &max6650_hwmon_ops,
+ .info = max6650_info,
+};
static int max6650_probe(struct i2c_client *client,
const struct i2c_device_id *id)
{
+ struct thermal_cooling_device *cooling_dev;
struct device *dev = &client->dev;
const struct of_device_id *of_id =
of_match_device(of_match_ptr(max6650_dt_match), dev);
@@ -767,37 +784,23 @@ static int max6650_probe(struct i2c_client *client,
if (err)
return err;
- data->groups[0] = &max6650_group;
- /* 3 additional fan inputs for the MAX6651 */
- if (data->nr_fans == 4)
- data->groups[1] = &max6651_group;
-
- hwmon_dev = devm_hwmon_device_register_with_groups(dev,
- client->name, data,
- data->groups);
+ hwmon_dev = devm_hwmon_device_register_with_info(dev,
+ client->name, data,
+ &max6650_chip_info,
+ max6650_groups);
err = PTR_ERR_OR_ZERO(hwmon_dev);
if (err)
return err;
-#if IS_ENABLED(CONFIG_THERMAL)
- data->cooling_dev =
- thermal_of_cooling_device_register(client->dev.of_node,
- client->name, data,
- &max6650_cooling_ops);
- if (IS_ERR(data->cooling_dev))
- dev_warn(&client->dev,
- "thermal cooling device register failed: %ld\n",
- PTR_ERR(data->cooling_dev));
-#endif
- return 0;
-}
-
-static int max6650_remove(struct i2c_client *client)
-{
- struct max6650_data *data = i2c_get_clientdata(client);
-
- if (!IS_ERR(data->cooling_dev))
- thermal_cooling_device_unregister(data->cooling_dev);
+ if (IS_ENABLED(CONFIG_THERMAL)) {
+ cooling_dev = devm_thermal_of_cooling_device_register(dev,
+ dev->of_node, client->name,
+ data, &max6650_cooling_ops);
+ if (IS_ERR(cooling_dev)) {
+ dev_warn(dev, "thermal cooling device register failed: %ld\n",
+ PTR_ERR(cooling_dev));
+ }
+ }
return 0;
}
@@ -815,7 +818,6 @@ static struct i2c_driver max6650_driver = {
.of_match_table = of_match_ptr(max6650_dt_match),
},
.probe = max6650_probe,
- .remove = max6650_remove,
.id_table = max6650_id,
};
Copyright © 1996 – 2023 Jason A. Donenfeld. All Rights Reverse Engineered.