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Commit 72fea694 authored by Jean Delvare's avatar Jean Delvare Committed by Jean Delvare
Browse files

hwmon: (w83795) Unconditionally support manual fan speed control 



Manual fan speed control uses a standard interface and has received
sufficient testing and review by now, it can be enabled
unconditionally. This includes attributes pwm[1-8], pwm[1-8]_enable,
pwm[1-8]_mode and pwm[1-8]_freq.

We only let the user switch from automatic mode to manual mode, but
not the other way around, as automatic control settings may not have
been set properly by the BIOS.

Signed-off-by: default avatarJean Delvare <khali@linux-fr.org>
Acked-by: default avatarGuenter Roeck <guenter.roeck@ericsson.com>
parent 941a956b

drivers/hwmon/Kconfig

+5 −4
Original line number Diff line number Diff line
@@ -1229,18 +1229,19 @@ config SENSORS_W83795 
	depends on I2C && EXPERIMENTAL

	help

	  If you say yes here you get support for the Winbond W83795G and

	  W83795ADG hardware monitoring chip.

	  W83795ADG hardware monitoring chip, including manual fan speed

	  control.



	  This driver can also be built as a module.  If so, the module

	  will be called w83795.



config SENSORS_W83795_FANCTRL

	boolean "Include fan control support (DANGEROUS)"

	boolean "Include automatic fan control support (DANGEROUS)"

	depends on SENSORS_W83795 && EXPERIMENTAL

	default n

	help

	  If you say yes here, support for the both manual and automatic

	  fan control features will be included in the driver.

	  If you say yes here, support for automatic fan speed control

	  will be included in the driver.



	  This part of the code wasn't carefully reviewed and tested yet,

	  so enabling this option is strongly discouraged on production

drivers/hwmon/w83795.c

+24 −14
Original line number Diff line number Diff line
@@ -929,6 +929,14 @@ store_pwm_enable(struct device *dev, struct device_attribute *attr, 
	if (val < 1 || val > 2)

		return -EINVAL;



#ifndef CONFIG_SENSORS_W83795_FANCTRL

	if (val > 1) {

		dev_warn(dev, "Automatic fan speed control support disabled\n");

		dev_warn(dev, "Build with CONFIG_SENSORS_W83795_FANCTRL=y if you want it\n");

		return -EOPNOTSUPP;

	}

#endif



	mutex_lock(&data->update_lock);

	switch (val) {

	case 1:
@@ -1625,18 +1633,18 @@ store_sf_setup(struct device *dev, struct device_attribute *attr, 
#define SENSOR_ATTR_PWM(index) {					\

	SENSOR_ATTR_2(pwm##index, S_IWUSR | S_IRUGO, show_pwm,		\

		store_pwm, PWM_OUTPUT, index - 1),			\

	SENSOR_ATTR_2(pwm##index##_enable, S_IWUSR | S_IRUGO,		\

		show_pwm_enable, store_pwm_enable, NOT_USED, index - 1), \

	SENSOR_ATTR_2(pwm##index##_mode, S_IRUGO,			\

		show_pwm_mode, NULL, NOT_USED, index - 1),		\

	SENSOR_ATTR_2(pwm##index##_freq, S_IWUSR | S_IRUGO,		\

		show_pwm, store_pwm, PWM_FREQ, index - 1),		\

	SENSOR_ATTR_2(pwm##index##_nonstop, S_IWUSR | S_IRUGO,		\

		show_pwm, store_pwm, PWM_NONSTOP, index - 1),		\

	SENSOR_ATTR_2(pwm##index##_start, S_IWUSR | S_IRUGO,		\

		show_pwm, store_pwm, PWM_START, index - 1),		\

	SENSOR_ATTR_2(pwm##index##_stop_time, S_IWUSR | S_IRUGO,	\

		show_pwm, store_pwm, PWM_STOP_TIME, index - 1),	 \

	SENSOR_ATTR_2(pwm##index##_freq, S_IWUSR | S_IRUGO,	\

		show_pwm, store_pwm, PWM_FREQ, index - 1),	 \

	SENSOR_ATTR_2(pwm##index##_enable, S_IWUSR | S_IRUGO,		\

		show_pwm_enable, store_pwm_enable, NOT_USED, index - 1), \

	SENSOR_ATTR_2(pwm##index##_mode, S_IRUGO,			\

		show_pwm_mode, NULL, NOT_USED, index - 1),		\

	SENSOR_ATTR_2(fan##index##_target, S_IWUSR | S_IRUGO, \

		show_fanin, store_fanin, FANIN_TARGET, index - 1) }
@@ -1953,6 +1961,14 @@ static int w83795_detect(struct i2c_client *client, 
	return 0;

}



#ifdef CONFIG_SENSORS_W83795_FANCTRL

#define NUM_PWM_ATTRIBUTES	ARRAY_SIZE(w83795_pwm[0])

#define NUM_TEMP_ATTRIBUTES	ARRAY_SIZE(w83795_temp[0])

#else

#define NUM_PWM_ATTRIBUTES	4

#define NUM_TEMP_ATTRIBUTES	8

#endif



static int w83795_handle_files(struct device *dev, int (*fn)(struct device *,

			       const struct device_attribute *))

{
@@ -2006,24 +2022,18 @@ static int w83795_handle_files(struct device *dev, int (*fn)(struct device *, 
		}

	}



#ifdef CONFIG_SENSORS_W83795_FANCTRL

	for (i = 0; i < data->has_pwm; i++) {

		for (j = 0; j < ARRAY_SIZE(w83795_pwm[0]); j++) {

		for (j = 0; j < NUM_PWM_ATTRIBUTES; j++) {

			err = fn(dev, &w83795_pwm[i][j].dev_attr);

			if (err)

				return err;

		}

	}

#endif



	for (i = 0; i < ARRAY_SIZE(w83795_temp); i++) {

		if (!(data->has_temp & (1 << i)))

			continue;

#ifdef CONFIG_SENSORS_W83795_FANCTRL

		for (j = 0; j < ARRAY_SIZE(w83795_temp[0]); j++) {

#else

		for (j = 0; j < 8; j++) {

#endif

		for (j = 0; j < NUM_TEMP_ATTRIBUTES; j++) {

			if (j == 7 && !data->enable_beep)

				continue;

			err = fn(dev, &w83795_temp[i][j].dev_attr);