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platform/x86: GPD pocket fan: Use a min-speed of 2 while charging

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Newer versions of the GPD pocket BIOS set the fan-speed to 2 when a
charger gets plugged in while the device is off. Mirror this in our
fan driver and use a minimum speed of 2 while charging,

Cc: James <kernel@madingley.org>
Suggested-by: James <kernel@madingley.org>
Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
This commit is contained in:
Hans de Goede 2018-01-19 21:47:08 +01:00 committed by Andy Shevchenko
parent d890acf728
commit 594ce6db32
1 changed files with 24 additions and 4 deletions
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28
drivers/platform/x86/gpd-pocket-fan.c
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@ -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;
}