diff options
| -rw-r--r-- | drivers/platform/x86/gpd-pocket-fan.c | 28 |
1 files changed, 24 insertions, 4 deletions
diff --git a/drivers/platform/x86/gpd-pocket-fan.c b/drivers/platform/x86/gpd-pocket-fan.c index 1fdf220..2652eb4 100644 --- a/drivers/platform/x86/gpd-pocket-fan.c +++ b/drivers/platform/x86/gpd-pocket-fan.c @@ -10,6 +10,7 @@ #include <linux/module.h> #include <linux/moduleparam.h> #include <linux/platform_device.h> +#include <linux/power_supply.h> #include <linux/thermal.h> #include <linux/workqueue.h> @@ -25,6 +26,11 @@ module_param(hysteresis, int, 0444); MODULE_PARM_DESC(hysteresis, "Hysteresis in milli-celcius before lowering the fan speed"); +static int speed_on_ac = 2; +module_param(speed_on_ac, int, 0444); +MODULE_PARM_DESC(speed_on_ac, + "minimum fan speed to allow when system is powered by AC"); + struct gpd_pocket_fan_data { struct device *dev; struct thermal_zone_device *dts0; @@ -46,11 +52,19 @@ static void gpd_pocket_fan_set_speed(struct gpd_pocket_fan_data *fan, int speed) fan->last_speed = speed; } +static int gpd_pocket_fan_min_speed(void) +{ + if (power_supply_is_system_supplied()) + return speed_on_ac; + else + return 0; +} + static void gpd_pocket_fan_worker(struct work_struct *work) { struct gpd_pocket_fan_data *fan = container_of(work, struct gpd_pocket_fan_data, work.work); - int t0, t1, temp, speed, i; + int t0, t1, temp, speed, min_speed, i; if (thermal_zone_get_temp(fan->dts0, &t0) || thermal_zone_get_temp(fan->dts1, &t1)) { @@ -62,9 +76,10 @@ static void gpd_pocket_fan_worker(struct work_struct *work) temp = max(t0, t1); speed = fan->last_speed; + min_speed = gpd_pocket_fan_min_speed(); /* Determine minimum speed */ - for (i = 0; i < ARRAY_SIZE(temp_limits); i++) { + for (i = min_speed; i < ARRAY_SIZE(temp_limits); i++) { if (temp < temp_limits[i]) break; } @@ -72,7 +87,7 @@ static void gpd_pocket_fan_worker(struct work_struct *work) speed = i; /* Use hysteresis before lowering speed again */ - for (i = 0; i < ARRAY_SIZE(temp_limits); i++) { + for (i = min_speed; i < ARRAY_SIZE(temp_limits); i++) { if (temp <= (temp_limits[i] - hysteresis)) break; } @@ -113,6 +128,11 @@ static int gpd_pocket_fan_probe(struct platform_device *pdev) hysteresis); return -EINVAL; } + if (speed_on_ac < 0 || speed_on_ac > MAX_SPEED) { + dev_err(&pdev->dev, "Invalid speed_on_ac %d (must be between 0 and 3)\n", + speed_on_ac); + return -EINVAL; + } fan = devm_kzalloc(&pdev->dev, sizeof(*fan), GFP_KERNEL); if (!fan) @@ -157,7 +177,7 @@ static int gpd_pocket_fan_suspend(struct device *dev) { struct gpd_pocket_fan_data *fan = dev_get_drvdata(dev); - gpd_pocket_fan_set_speed(fan, 0); + gpd_pocket_fan_set_speed(fan, gpd_pocket_fan_min_speed()); return 0; } |
