aboutsummaryrefslogtreecommitdiffstats
path: root/drivers/hwmon/mlxreg-fan.c
diff options
context:
space:
mode:
Diffstat (limited to 'drivers/hwmon/mlxreg-fan.c')
-rw-r--r--drivers/hwmon/mlxreg-fan.c150
1 files changed, 111 insertions, 39 deletions
diff --git a/drivers/hwmon/mlxreg-fan.c b/drivers/hwmon/mlxreg-fan.c
index 116681fde33d..4a8becdb0d58 100644
--- a/drivers/hwmon/mlxreg-fan.c
+++ b/drivers/hwmon/mlxreg-fan.c
@@ -12,7 +12,9 @@
#include <linux/regmap.h>
#include <linux/thermal.h>
-#define MLXREG_FAN_MAX_TACHO 12
+#define MLXREG_FAN_MAX_TACHO 14
+#define MLXREG_FAN_MAX_PWM 4
+#define MLXREG_FAN_PWM_NOT_CONNECTED 0xff
#define MLXREG_FAN_MAX_STATE 10
#define MLXREG_FAN_MIN_DUTY 51 /* 20% */
#define MLXREG_FAN_MAX_DUTY 255 /* 100% */
@@ -61,6 +63,8 @@
MLXREG_FAN_MAX_DUTY, \
MLXREG_FAN_MAX_STATE))
+struct mlxreg_fan;
+
/*
* struct mlxreg_fan_tacho - tachometer data (internal use):
*
@@ -79,12 +83,18 @@ struct mlxreg_fan_tacho {
/*
* struct mlxreg_fan_pwm - PWM data (internal use):
*
+ * @fan: private data;
* @connected: indicates if PWM is connected;
* @reg: register offset;
+ * @cooling: cooling device levels;
+ * @cdev: cooling device;
*/
struct mlxreg_fan_pwm {
+ struct mlxreg_fan *fan;
bool connected;
u32 reg;
+ u8 cooling_levels[MLXREG_FAN_MAX_STATE + 1];
+ struct thermal_cooling_device *cdev;
};
/*
@@ -97,20 +107,16 @@ struct mlxreg_fan_pwm {
* @tachos_per_drwr - number of tachometers per drawer;
* @samples: minimum allowed samples per pulse;
* @divider: divider value for tachometer RPM calculation;
- * @cooling: cooling device levels;
- * @cdev: cooling device;
*/
struct mlxreg_fan {
struct device *dev;
void *regmap;
struct mlxreg_core_platform_data *pdata;
struct mlxreg_fan_tacho tacho[MLXREG_FAN_MAX_TACHO];
- struct mlxreg_fan_pwm pwm;
+ struct mlxreg_fan_pwm pwm[MLXREG_FAN_MAX_PWM];
int tachos_per_drwr;
int samples;
int divider;
- u8 cooling_levels[MLXREG_FAN_MAX_STATE + 1];
- struct thermal_cooling_device *cdev;
};
static int
@@ -119,6 +125,7 @@ mlxreg_fan_read(struct device *dev, enum hwmon_sensor_types type, u32 attr,
{
struct mlxreg_fan *fan = dev_get_drvdata(dev);
struct mlxreg_fan_tacho *tacho;
+ struct mlxreg_fan_pwm *pwm;
u32 regval;
int err;
@@ -169,9 +176,10 @@ mlxreg_fan_read(struct device *dev, enum hwmon_sensor_types type, u32 attr,
break;
case hwmon_pwm:
+ pwm = &fan->pwm[channel];
switch (attr) {
case hwmon_pwm_input:
- err = regmap_read(fan->regmap, fan->pwm.reg, &regval);
+ err = regmap_read(fan->regmap, pwm->reg, &regval);
if (err)
return err;
@@ -195,6 +203,7 @@ mlxreg_fan_write(struct device *dev, enum hwmon_sensor_types type, u32 attr,
int channel, long val)
{
struct mlxreg_fan *fan = dev_get_drvdata(dev);
+ struct mlxreg_fan_pwm *pwm;
switch (type) {
case hwmon_pwm:
@@ -203,7 +212,8 @@ mlxreg_fan_write(struct device *dev, enum hwmon_sensor_types type, u32 attr,
if (val < MLXREG_FAN_MIN_DUTY ||
val > MLXREG_FAN_MAX_DUTY)
return -EINVAL;
- return regmap_write(fan->regmap, fan->pwm.reg, val);
+ pwm = &fan->pwm[channel];
+ return regmap_write(fan->regmap, pwm->reg, val);
default:
return -EOPNOTSUPP;
}
@@ -235,7 +245,7 @@ mlxreg_fan_is_visible(const void *data, enum hwmon_sensor_types type, u32 attr,
break;
case hwmon_pwm:
- if (!(((struct mlxreg_fan *)data)->pwm.connected))
+ if (!(((struct mlxreg_fan *)data)->pwm[channel].connected))
return 0;
switch (attr) {
@@ -253,6 +263,13 @@ mlxreg_fan_is_visible(const void *data, enum hwmon_sensor_types type, u32 attr,
return 0;
}
+static char *mlxreg_fan_name[] = {
+ "mlxreg_fan",
+ "mlxreg_fan1",
+ "mlxreg_fan2",
+ "mlxreg_fan3",
+};
+
static const struct hwmon_channel_info *mlxreg_fan_hwmon_info[] = {
HWMON_CHANNEL_INFO(fan,
HWMON_F_INPUT | HWMON_F_FAULT,
@@ -266,8 +283,13 @@ static const struct hwmon_channel_info *mlxreg_fan_hwmon_info[] = {
HWMON_F_INPUT | HWMON_F_FAULT,
HWMON_F_INPUT | HWMON_F_FAULT,
HWMON_F_INPUT | HWMON_F_FAULT,
+ HWMON_F_INPUT | HWMON_F_FAULT,
+ HWMON_F_INPUT | HWMON_F_FAULT,
HWMON_F_INPUT | HWMON_F_FAULT),
HWMON_CHANNEL_INFO(pwm,
+ HWMON_PWM_INPUT,
+ HWMON_PWM_INPUT,
+ HWMON_PWM_INPUT,
HWMON_PWM_INPUT),
NULL
};
@@ -294,11 +316,12 @@ static int mlxreg_fan_get_cur_state(struct thermal_cooling_device *cdev,
unsigned long *state)
{
- struct mlxreg_fan *fan = cdev->devdata;
+ struct mlxreg_fan_pwm *pwm = cdev->devdata;
+ struct mlxreg_fan *fan = pwm->fan;
u32 regval;
int err;
- err = regmap_read(fan->regmap, fan->pwm.reg, &regval);
+ err = regmap_read(fan->regmap, pwm->reg, &regval);
if (err) {
dev_err(fan->dev, "Failed to query PWM duty\n");
return err;
@@ -313,10 +336,11 @@ static int mlxreg_fan_set_cur_state(struct thermal_cooling_device *cdev,
unsigned long state)
{
- struct mlxreg_fan *fan = cdev->devdata;
+ struct mlxreg_fan_pwm *pwm = cdev->devdata;
+ struct mlxreg_fan *fan = pwm->fan;
unsigned long cur_state;
+ int i, config = 0;
u32 regval;
- int i;
int err;
/*
@@ -329,13 +353,19 @@ static int mlxreg_fan_set_cur_state(struct thermal_cooling_device *cdev,
* overwritten.
*/
if (state >= MLXREG_FAN_SPEED_MIN && state <= MLXREG_FAN_SPEED_MAX) {
+ /*
+ * This is configuration change, which is only supported through sysfs.
+ * For configuration non-zero value is to be returned to avoid thermal
+ * statistics update.
+ */
+ config = 1;
state -= MLXREG_FAN_MAX_STATE;
for (i = 0; i < state; i++)
- fan->cooling_levels[i] = state;
+ pwm->cooling_levels[i] = state;
for (i = state; i <= MLXREG_FAN_MAX_STATE; i++)
- fan->cooling_levels[i] = i;
+ pwm->cooling_levels[i] = i;
- err = regmap_read(fan->regmap, fan->pwm.reg, &regval);
+ err = regmap_read(fan->regmap, pwm->reg, &regval);
if (err) {
dev_err(fan->dev, "Failed to query PWM duty\n");
return err;
@@ -343,7 +373,7 @@ static int mlxreg_fan_set_cur_state(struct thermal_cooling_device *cdev,
cur_state = MLXREG_FAN_PWM_DUTY2STATE(regval);
if (state < cur_state)
- return 0;
+ return config;
state = cur_state;
}
@@ -352,14 +382,14 @@ static int mlxreg_fan_set_cur_state(struct thermal_cooling_device *cdev,
return -EINVAL;
/* Normalize the state to the valid speed range. */
- state = fan->cooling_levels[state];
- err = regmap_write(fan->regmap, fan->pwm.reg,
+ state = pwm->cooling_levels[state];
+ err = regmap_write(fan->regmap, pwm->reg,
MLXREG_FAN_PWM_STATE2DUTY(state));
if (err) {
dev_err(fan->dev, "Failed to write PWM duty\n");
return err;
}
- return 0;
+ return config;
}
static const struct thermal_cooling_device_ops mlxreg_fan_cooling_ops = {
@@ -384,6 +414,22 @@ static int mlxreg_fan_connect_verify(struct mlxreg_fan *fan,
return !!(regval & data->bit);
}
+static int mlxreg_pwm_connect_verify(struct mlxreg_fan *fan,
+ struct mlxreg_core_data *data)
+{
+ u32 regval;
+ int err;
+
+ err = regmap_read(fan->regmap, data->reg, &regval);
+ if (err) {
+ dev_err(fan->dev, "Failed to query pwm register 0x%08x\n",
+ data->reg);
+ return err;
+ }
+
+ return regval != MLXREG_FAN_PWM_NOT_CONNECTED;
+}
+
static int mlxreg_fan_speed_divider_get(struct mlxreg_fan *fan,
struct mlxreg_core_data *data)
{
@@ -412,8 +458,8 @@ static int mlxreg_fan_speed_divider_get(struct mlxreg_fan *fan,
static int mlxreg_fan_config(struct mlxreg_fan *fan,
struct mlxreg_core_platform_data *pdata)
{
+ int tacho_num = 0, tacho_avail = 0, pwm_num = 0, i;
struct mlxreg_core_data *data = pdata->data;
- int tacho_num = 0, tacho_avail = 0, i;
bool configured = false;
int err;
@@ -443,13 +489,24 @@ static int mlxreg_fan_config(struct mlxreg_fan *fan,
fan->tacho[tacho_num++].connected = true;
tacho_avail++;
} else if (strnstr(data->label, "pwm", sizeof(data->label))) {
- if (fan->pwm.connected) {
- dev_err(fan->dev, "duplicate pwm entry: %s\n",
+ if (pwm_num == MLXREG_FAN_MAX_TACHO) {
+ dev_err(fan->dev, "too many pwm entries: %s\n",
data->label);
return -EINVAL;
}
- fan->pwm.reg = data->reg;
- fan->pwm.connected = true;
+
+ /* Validate if more then one PWM is connected. */
+ if (pwm_num) {
+ err = mlxreg_pwm_connect_verify(fan, data);
+ if (err < 0)
+ return err;
+ else if (!err)
+ continue;
+ }
+
+ fan->pwm[pwm_num].reg = data->reg;
+ fan->pwm[pwm_num].connected = true;
+ pwm_num++;
} else if (strnstr(data->label, "conf", sizeof(data->label))) {
if (configured) {
dev_err(fan->dev, "duplicate conf entry: %s\n",
@@ -502,11 +559,32 @@ static int mlxreg_fan_config(struct mlxreg_fan *fan,
fan->tachos_per_drwr = tacho_avail / drwr_avail;
}
- /* Init cooling levels per PWM state. */
- for (i = 0; i < MLXREG_FAN_SPEED_MIN_LEVEL; i++)
- fan->cooling_levels[i] = MLXREG_FAN_SPEED_MIN_LEVEL;
- for (i = MLXREG_FAN_SPEED_MIN_LEVEL; i <= MLXREG_FAN_MAX_STATE; i++)
- fan->cooling_levels[i] = i;
+ return 0;
+}
+
+static int mlxreg_fan_cooling_config(struct device *dev, struct mlxreg_fan *fan)
+{
+ int i, j;
+
+ for (i = 0; i < MLXREG_FAN_MAX_PWM; i++) {
+ struct mlxreg_fan_pwm *pwm = &fan->pwm[i];
+
+ if (!pwm->connected)
+ continue;
+ pwm->fan = fan;
+ pwm->cdev = devm_thermal_of_cooling_device_register(dev, NULL, mlxreg_fan_name[i],
+ pwm, &mlxreg_fan_cooling_ops);
+ if (IS_ERR(pwm->cdev)) {
+ dev_err(dev, "Failed to register cooling device\n");
+ return PTR_ERR(pwm->cdev);
+ }
+
+ /* Init cooling levels per PWM state. */
+ for (j = 0; j < MLXREG_FAN_SPEED_MIN_LEVEL; j++)
+ pwm->cooling_levels[j] = MLXREG_FAN_SPEED_MIN_LEVEL;
+ for (j = MLXREG_FAN_SPEED_MIN_LEVEL; j <= MLXREG_FAN_MAX_STATE; j++)
+ pwm->cooling_levels[j] = j;
+ }
return 0;
}
@@ -545,16 +623,10 @@ static int mlxreg_fan_probe(struct platform_device *pdev)
return PTR_ERR(hwm);
}
- if (IS_REACHABLE(CONFIG_THERMAL)) {
- fan->cdev = devm_thermal_of_cooling_device_register(dev,
- NULL, "mlxreg_fan", fan, &mlxreg_fan_cooling_ops);
- if (IS_ERR(fan->cdev)) {
- dev_err(dev, "Failed to register cooling device\n");
- return PTR_ERR(fan->cdev);
- }
- }
+ if (IS_REACHABLE(CONFIG_THERMAL))
+ err = mlxreg_fan_cooling_config(dev, fan);
- return 0;
+ return err;
}
static struct platform_driver mlxreg_fan_driver = {
Copyright © 1996 – 2023 Jason A. Donenfeld. All Rights Reverse Engineered.