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path: root/drivers/platform/x86/gpd-pocket-fan.c
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-rw-r--r--drivers/platform/x86/gpd-pocket-fan.c224
1 files changed, 224 insertions, 0 deletions
diff --git a/drivers/platform/x86/gpd-pocket-fan.c b/drivers/platform/x86/gpd-pocket-fan.c
new file mode 100644
index 000000000..7a20f68ae
--- /dev/null
+++ b/drivers/platform/x86/gpd-pocket-fan.c
@@ -0,0 +1,224 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * GPD Pocket fan controller driver
+ *
+ * Copyright (C) 2017 Hans de Goede <hdegoede@redhat.com>
+ */
+
+#include <linux/acpi.h>
+#include <linux/devm-helpers.h>
+#include <linux/gpio/consumer.h>
+#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>
+
+#define MAX_SPEED 3
+
+#define TEMP_LIMIT0_DEFAULT 55000
+#define TEMP_LIMIT1_DEFAULT 60000
+#define TEMP_LIMIT2_DEFAULT 65000
+
+#define HYSTERESIS_DEFAULT 3000
+
+#define SPEED_ON_AC_DEFAULT 2
+
+static int temp_limits[3] = {
+ TEMP_LIMIT0_DEFAULT, TEMP_LIMIT1_DEFAULT, TEMP_LIMIT2_DEFAULT,
+};
+module_param_array(temp_limits, int, NULL, 0444);
+MODULE_PARM_DESC(temp_limits,
+ "Millicelsius values above which the fan speed increases");
+
+static int hysteresis = HYSTERESIS_DEFAULT;
+module_param(hysteresis, int, 0444);
+MODULE_PARM_DESC(hysteresis,
+ "Hysteresis in millicelsius before lowering the fan speed");
+
+static int speed_on_ac = SPEED_ON_AC_DEFAULT;
+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;
+ struct thermal_zone_device *dts1;
+ struct gpio_desc *gpio0;
+ struct gpio_desc *gpio1;
+ struct delayed_work work;
+ int last_speed;
+};
+
+static void gpd_pocket_fan_set_speed(struct gpd_pocket_fan_data *fan, int speed)
+{
+ if (speed == fan->last_speed)
+ return;
+
+ gpiod_direction_output(fan->gpio0, !!(speed & 1));
+ gpiod_direction_output(fan->gpio1, !!(speed & 2));
+
+ 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, min_speed, i;
+
+ if (thermal_zone_get_temp(fan->dts0, &t0) ||
+ thermal_zone_get_temp(fan->dts1, &t1)) {
+ dev_warn(fan->dev, "Error getting temperature\n");
+ speed = MAX_SPEED;
+ goto set_speed;
+ }
+
+ temp = max(t0, t1);
+
+ speed = fan->last_speed;
+ min_speed = gpd_pocket_fan_min_speed();
+
+ /* Determine minimum speed */
+ for (i = min_speed; i < ARRAY_SIZE(temp_limits); i++) {
+ if (temp < temp_limits[i])
+ break;
+ }
+ if (speed < i)
+ speed = i;
+
+ /* Use hysteresis before lowering speed again */
+ for (i = min_speed; i < ARRAY_SIZE(temp_limits); i++) {
+ if (temp <= (temp_limits[i] - hysteresis))
+ break;
+ }
+ if (speed > i)
+ speed = i;
+
+ if (fan->last_speed <= 0 && speed)
+ speed = MAX_SPEED; /* kick start motor */
+
+set_speed:
+ gpd_pocket_fan_set_speed(fan, speed);
+
+ /* When mostly idle (low temp/speed), slow down the poll interval. */
+ queue_delayed_work(system_wq, &fan->work,
+ msecs_to_jiffies(4000 / (speed + 1)));
+}
+
+static void gpd_pocket_fan_force_update(struct gpd_pocket_fan_data *fan)
+{
+ fan->last_speed = -1;
+ mod_delayed_work(system_wq, &fan->work, 0);
+}
+
+static int gpd_pocket_fan_probe(struct platform_device *pdev)
+{
+ struct gpd_pocket_fan_data *fan;
+ int i, ret;
+
+ for (i = 0; i < ARRAY_SIZE(temp_limits); i++) {
+ if (temp_limits[i] < 20000 || temp_limits[i] > 90000) {
+ dev_err(&pdev->dev, "Invalid temp-limit %d (must be between 20000 and 90000)\n",
+ temp_limits[i]);
+ temp_limits[0] = TEMP_LIMIT0_DEFAULT;
+ temp_limits[1] = TEMP_LIMIT1_DEFAULT;
+ temp_limits[2] = TEMP_LIMIT2_DEFAULT;
+ break;
+ }
+ }
+ if (hysteresis < 1000 || hysteresis > 10000) {
+ dev_err(&pdev->dev, "Invalid hysteresis %d (must be between 1000 and 10000)\n",
+ hysteresis);
+ hysteresis = HYSTERESIS_DEFAULT;
+ }
+ 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);
+ speed_on_ac = SPEED_ON_AC_DEFAULT;
+ }
+
+ fan = devm_kzalloc(&pdev->dev, sizeof(*fan), GFP_KERNEL);
+ if (!fan)
+ return -ENOMEM;
+
+ fan->dev = &pdev->dev;
+ ret = devm_delayed_work_autocancel(&pdev->dev, &fan->work,
+ gpd_pocket_fan_worker);
+ if (ret)
+ return ret;
+
+ /* Note this returns a "weak" reference which we don't need to free */
+ fan->dts0 = thermal_zone_get_zone_by_name("soc_dts0");
+ if (IS_ERR(fan->dts0))
+ return -EPROBE_DEFER;
+
+ fan->dts1 = thermal_zone_get_zone_by_name("soc_dts1");
+ if (IS_ERR(fan->dts1))
+ return -EPROBE_DEFER;
+
+ fan->gpio0 = devm_gpiod_get_index(fan->dev, NULL, 0, GPIOD_ASIS);
+ if (IS_ERR(fan->gpio0))
+ return PTR_ERR(fan->gpio0);
+
+ fan->gpio1 = devm_gpiod_get_index(fan->dev, NULL, 1, GPIOD_ASIS);
+ if (IS_ERR(fan->gpio1))
+ return PTR_ERR(fan->gpio1);
+
+ gpd_pocket_fan_force_update(fan);
+
+ platform_set_drvdata(pdev, fan);
+ return 0;
+}
+
+#ifdef CONFIG_PM_SLEEP
+static int gpd_pocket_fan_suspend(struct device *dev)
+{
+ struct gpd_pocket_fan_data *fan = dev_get_drvdata(dev);
+
+ cancel_delayed_work_sync(&fan->work);
+ gpd_pocket_fan_set_speed(fan, gpd_pocket_fan_min_speed());
+ return 0;
+}
+
+static int gpd_pocket_fan_resume(struct device *dev)
+{
+ struct gpd_pocket_fan_data *fan = dev_get_drvdata(dev);
+
+ gpd_pocket_fan_force_update(fan);
+ return 0;
+}
+#endif
+static SIMPLE_DEV_PM_OPS(gpd_pocket_fan_pm_ops,
+ gpd_pocket_fan_suspend,
+ gpd_pocket_fan_resume);
+
+static struct acpi_device_id gpd_pocket_fan_acpi_match[] = {
+ { "FAN02501" },
+ {},
+};
+MODULE_DEVICE_TABLE(acpi, gpd_pocket_fan_acpi_match);
+
+static struct platform_driver gpd_pocket_fan_driver = {
+ .probe = gpd_pocket_fan_probe,
+ .driver = {
+ .name = "gpd_pocket_fan",
+ .acpi_match_table = gpd_pocket_fan_acpi_match,
+ .pm = &gpd_pocket_fan_pm_ops,
+ },
+};
+
+module_platform_driver(gpd_pocket_fan_driver);
+MODULE_AUTHOR("Hans de Goede <hdegoede@redhat.com");
+MODULE_DESCRIPTION("GPD pocket fan driver");
+MODULE_LICENSE("GPL");