platform/x86: Add driver for GPD pocket custom fan controller
Add a driver for the GPD pocket device's custom fan controller, which gets controlled through 2 GPIOs listed in a FAN02501 ACPI device. 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>hifive-unleashed-5.1
Hans de Goede
Andy Shevchenko
parent
26befef00e
commit
1b46f17d68
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@ -5947,6 +5947,12 @@ L: linux-input@vger.kernel.org
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S: Maintained
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F: drivers/input/touchscreen/goodix.c
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GPD POCKET FAN DRIVER
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M: Hans de Goede <hdegoede@redhat.com>
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L: platform-driver-x86@vger.kernel.org
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S: Maintained
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F: drivers/platform/x86/gpd-pocket-fan.c
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GPIO ACPI SUPPORT
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M: Mika Westerberg <mika.westerberg@linux.intel.com>
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M: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
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@ -258,6 +258,18 @@ config AMILO_RFKILL
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This is a driver for enabling wifi on some Fujitsu-Siemens Amilo
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laptops.
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config GPD_POCKET_FAN
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tristate "GPD Pocket Fan Controller support"
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depends on ACPI
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depends on THERMAL
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---help---
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Driver for the GPD Pocket vendor specific FAN02501 ACPI device
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which controls the fan speed on the GPD Pocket.
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Without this driver the fan on the Pocket will stay off independent
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of the CPU temperature. Say Y or M if the kernel may be used on a
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GPD pocket.
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config TC1100_WMI
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tristate "HP Compaq TC1100 Tablet WMI Extras"
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depends on !X86_64
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@ -29,6 +29,7 @@ obj-$(CONFIG_HP_ACCEL) += hp_accel.o
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obj-$(CONFIG_HP_WIRELESS) += hp-wireless.o
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obj-$(CONFIG_HP_WMI) += hp-wmi.o
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obj-$(CONFIG_AMILO_RFKILL) += amilo-rfkill.o
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obj-$(CONFIG_GPD_POCKET_FAN) += gpd-pocket-fan.o
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obj-$(CONFIG_TC1100_WMI) += tc1100-wmi.o
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obj-$(CONFIG_SONY_LAPTOP) += sony-laptop.o
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obj-$(CONFIG_IDEAPAD_LAPTOP) += ideapad-laptop.o
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@ -0,0 +1,193 @@
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// SPDX-License-Identifier: GPL-2.0+
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/*
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* GPD Pocket fan controller driver
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*
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* Copyright (C) 2017 Hans de Goede <hdegoede@redhat.com>
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*/
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#include <linux/acpi.h>
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#include <linux/gpio/consumer.h>
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#include <linux/module.h>
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#include <linux/moduleparam.h>
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#include <linux/platform_device.h>
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#include <linux/thermal.h>
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#include <linux/workqueue.h>
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static int temp_limits[3] = { 55000, 60000, 65000 };
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module_param_array(temp_limits, int, NULL, 0444);
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MODULE_PARM_DESC(temp_limits,
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"Milli-celcius values above which the fan speed increases");
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static int hysteresis = 3000;
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module_param(hysteresis, int, 0444);
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MODULE_PARM_DESC(hysteresis,
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"Hysteresis in milli-celcius before lowering the fan speed");
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struct gpd_pocket_fan_data {
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struct device *dev;
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struct thermal_zone_device *dts0;
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struct thermal_zone_device *dts1;
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struct gpio_desc *gpio0;
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struct gpio_desc *gpio1;
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struct delayed_work work;
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int last_speed;
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};
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static void gpd_pocket_fan_set_speed(struct gpd_pocket_fan_data *fan, int speed)
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{
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if (speed == fan->last_speed)
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return;
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gpiod_direction_output(fan->gpio0, !!(speed & 1));
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gpiod_direction_output(fan->gpio1, !!(speed & 2));
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fan->last_speed = speed;
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}
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static void gpd_pocket_fan_worker(struct work_struct *work)
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{
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struct gpd_pocket_fan_data *fan =
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container_of(work, struct gpd_pocket_fan_data, work.work);
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int t0, t1, temp, speed, i;
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if (thermal_zone_get_temp(fan->dts0, &t0) ||
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thermal_zone_get_temp(fan->dts1, &t1)) {
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dev_warn(fan->dev, "Error getting temperature\n");
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queue_delayed_work(system_wq, &fan->work,
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msecs_to_jiffies(1000));
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return;
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}
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temp = max(t0, t1);
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speed = fan->last_speed;
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/* Determine minimum speed */
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for (i = 0; i < ARRAY_SIZE(temp_limits); i++) {
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if (temp < temp_limits[i])
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break;
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}
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if (speed < i)
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speed = i;
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/* Use hysteresis before lowering speed again */
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for (i = 0; i < ARRAY_SIZE(temp_limits); i++) {
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if (temp <= (temp_limits[i] - hysteresis))
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break;
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}
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if (speed > i)
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speed = i;
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if (fan->last_speed <= 0 && speed)
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speed = 3; /* kick start motor */
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gpd_pocket_fan_set_speed(fan, speed);
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/* When mostly idle (low temp/speed), slow down the poll interval. */
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queue_delayed_work(system_wq, &fan->work,
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msecs_to_jiffies(4000 / (speed + 1)));
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}
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static void gpd_pocket_fan_force_update(struct gpd_pocket_fan_data *fan)
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{
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fan->last_speed = -1;
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mod_delayed_work(system_wq, &fan->work, 0);
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}
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static int gpd_pocket_fan_probe(struct platform_device *pdev)
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{
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struct gpd_pocket_fan_data *fan;
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int i;
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for (i = 0; i < ARRAY_SIZE(temp_limits); i++) {
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if (temp_limits[i] < 40000 || temp_limits[i] > 70000) {
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dev_err(&pdev->dev, "Invalid temp-limit %d (must be between 40000 and 70000)\n",
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temp_limits[i]);
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return -EINVAL;
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}
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}
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if (hysteresis < 1000 || hysteresis > 10000) {
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dev_err(&pdev->dev, "Invalid hysteresis %d (must be between 1000 and 10000)\n",
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hysteresis);
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return -EINVAL;
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}
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fan = devm_kzalloc(&pdev->dev, sizeof(*fan), GFP_KERNEL);
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if (!fan)
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return -ENOMEM;
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fan->dev = &pdev->dev;
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INIT_DELAYED_WORK(&fan->work, gpd_pocket_fan_worker);
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/* Note this returns a "weak" reference which we don't need to free */
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fan->dts0 = thermal_zone_get_zone_by_name("soc_dts0");
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if (IS_ERR(fan->dts0))
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return -EPROBE_DEFER;
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fan->dts1 = thermal_zone_get_zone_by_name("soc_dts1");
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if (IS_ERR(fan->dts1))
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return -EPROBE_DEFER;
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fan->gpio0 = devm_gpiod_get_index(fan->dev, NULL, 0, GPIOD_ASIS);
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if (IS_ERR(fan->gpio0))
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return PTR_ERR(fan->gpio0);
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fan->gpio1 = devm_gpiod_get_index(fan->dev, NULL, 1, GPIOD_ASIS);
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if (IS_ERR(fan->gpio1))
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return PTR_ERR(fan->gpio1);
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gpd_pocket_fan_force_update(fan);
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platform_set_drvdata(pdev, fan);
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return 0;
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}
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static int gpd_pocket_fan_remove(struct platform_device *pdev)
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{
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struct gpd_pocket_fan_data *fan = platform_get_drvdata(pdev);
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cancel_delayed_work_sync(&fan->work);
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return 0;
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}
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#ifdef CONFIG_PM_SLEEP
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static int gpd_pocket_fan_suspend(struct device *dev)
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{
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struct gpd_pocket_fan_data *fan = dev_get_drvdata(dev);
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gpd_pocket_fan_set_speed(fan, 0);
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return 0;
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}
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static int gpd_pocket_fan_resume(struct device *dev)
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{
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struct gpd_pocket_fan_data *fan = dev_get_drvdata(dev);
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gpd_pocket_fan_force_update(fan);
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return 0;
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}
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#endif
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static SIMPLE_DEV_PM_OPS(gpd_pocket_fan_pm_ops,
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gpd_pocket_fan_suspend,
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gpd_pocket_fan_resume);
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static struct acpi_device_id gpd_pocket_fan_acpi_match[] = {
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{ "FAN02501" },
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{},
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};
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MODULE_DEVICE_TABLE(acpi, gpd_pocket_fan_acpi_match);
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static struct platform_driver gpd_pocket_fan_driver = {
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.probe = gpd_pocket_fan_probe,
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.remove = gpd_pocket_fan_remove,
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.driver = {
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.name = "gpd_pocket_fan",
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.acpi_match_table = gpd_pocket_fan_acpi_match,
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.pm = &gpd_pocket_fan_pm_ops,
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},
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};
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module_platform_driver(gpd_pocket_fan_driver);
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MODULE_AUTHOR("Hans de Goede <hdegoede@redhat.com");
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MODULE_DESCRIPTION("GPD pocket fan driver");
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MODULE_LICENSE("GPL");
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