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authorJean Delvare <khali@linux-fr.org>2012-03-23 10:02:17 +0100
committerJean Delvare <khali@endymion.delvare>2012-03-23 10:02:17 +0100
commit72fea694c4208d7ee1704a7dbccddd54af352cde (patch)
treead5db0b19671d6dac0a4da35f82e469ae4681cba
parent941a956b0e387b21f385f486c34ef67576775cfc (diff)
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: Jean Delvare <khali@linux-fr.org> Acked-by: Guenter Roeck <guenter.roeck@ericsson.com>
-rw-r--r--drivers/hwmon/Kconfig9
-rw-r--r--drivers/hwmon/w83795.c38
2 files changed, 29 insertions, 18 deletions
diff --git a/drivers/hwmon/Kconfig b/drivers/hwmon/Kconfig
index 811e6c47e7e..783a3144ffd 100644
--- a/drivers/hwmon/Kconfig
+++ b/drivers/hwmon/Kconfig
@@ -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
diff --git a/drivers/hwmon/w83795.c b/drivers/hwmon/w83795.c
index deb12c98280..5478dd13623 100644
--- a/drivers/hwmon/w83795.c
+++ b/drivers/hwmon/w83795.c
@@ -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);