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 <ker...@madingley.org>
Suggested-by: James <ker...@madingley.org>
Signed-off-by: Hans de Goede <hdego...@redhat.com>
---
Changes in v2:
-Fix SPDX license tag
-Use different email address for James at his request
---
MAINTAINERS | 6 ++
drivers/platform/x86/Kconfig | 12 +++
drivers/platform/x86/Makefile | 1 +
drivers/platform/x86/gpd-pocket-fan.c | 193 ++++++++++++++++++++++++++++++++++
4 files changed, 212 insertions(+)
create mode 100644 drivers/platform/x86/gpd-pocket-fan.c
diff --git a/MAINTAINERS b/MAINTAINERS
index 32e2d03a47fc..a9dbc8113bdc 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -5949,6 +5949,12 @@ L: linux-in...@vger.kernel.org
S: Maintained
F: drivers/input/touchscreen/goodix.c
+GPD POCKET FAN DRIVER
+M: Hans de Goede <hdego...@redhat.com>
+L: platform-driver-...@vger.kernel.org
+S: Maintained
+F: drivers/platform/x86/gpd-pocket-fan.c
+
GPIO ACPI SUPPORT
M: Mika Westerberg <mika.westerb...@linux.intel.com>
M: Andy Shevchenko <andriy.shevche...@linux.intel.com>
diff --git a/drivers/platform/x86/Kconfig b/drivers/platform/x86/Kconfig
index e3cff861839d..54431e712057 100644
--- a/drivers/platform/x86/Kconfig
+++ b/drivers/platform/x86/Kconfig
@@ -244,6 +244,18 @@ config AMILO_RFKILL
This is a driver for enabling wifi on some Fujitsu-Siemens Amilo
laptops.
+config GPD_POCKET_FAN
+ tristate "GPD Pocket Fan Controller support"
+ depends on ACPI
+ depends on THERMAL
+ ---help---
+ Driver for the GPD Pocket vendor specific FAN02501 ACPI device
+ which controls the fan speed on the GPD Pocket.
+
+ Without this driver the fan on the Pocket will stay off independent
+ of the CPU temperature. Say Y or M if the kernel may be used on a
+ GPD pocket.
+
config TC1100_WMI
tristate "HP Compaq TC1100 Tablet WMI Extras"
depends on !X86_64
diff --git a/drivers/platform/x86/Makefile b/drivers/platform/x86/Makefile
index c32b34a72467..9b215bda5e4c 100644
--- a/drivers/platform/x86/Makefile
+++ b/drivers/platform/x86/Makefile
@@ -28,6 +28,7 @@ obj-$(CONFIG_HP_ACCEL) += hp_accel.o
obj-$(CONFIG_HP_WIRELESS) += hp-wireless.o
obj-$(CONFIG_HP_WMI) += hp-wmi.o
obj-$(CONFIG_AMILO_RFKILL) += amilo-rfkill.o
+obj-$(CONFIG_GPD_POCKET_FAN) += gpd-pocket-fan.o
obj-$(CONFIG_TC1100_WMI) += tc1100-wmi.o
obj-$(CONFIG_SONY_LAPTOP) += sony-laptop.o
obj-$(CONFIG_IDEAPAD_LAPTOP) += ideapad-laptop.o
diff --git a/drivers/platform/x86/gpd-pocket-fan.c
b/drivers/platform/x86/gpd-pocket-fan.c
new file mode 100644
index 000000000000..c6f4d89b1437
--- /dev/null
+++ b/drivers/platform/x86/gpd-pocket-fan.c
@@ -0,0 +1,193 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * GPD Pocket fan controller driver
+ *
+ * Copyright (C) 2017 Hans de Goede <hdego...@redhat.com>
+ */
+
+#include <linux/acpi.h>
+#include <linux/gpio/consumer.h>
+#include <linux/module.h>
+#include <linux/moduleparam.h>
+#include <linux/platform_device.h>
+#include <linux/thermal.h>
+#include <linux/workqueue.h>
+
+static int temp_limits[3] = { 55000, 60000, 65000 };
+module_param_array(temp_limits, int, NULL, 0444);
+MODULE_PARM_DESC(temp_limits,
+ "Milli-celcius values above which the fan speed increases");
+
+static int hysteresis = 3000;
+module_param(hysteresis, int, 0444);
+MODULE_PARM_DESC(hysteresis,
+ "Hysteresis in milli-celcius before lowering the fan speed");
+
+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 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;
+
+ if (thermal_zone_get_temp(fan->dts0, &t0) ||
+ thermal_zone_get_temp(fan->dts1, &t1)) {
+ dev_warn(fan->dev, "Error getting temperature\n");
+ queue_delayed_work(system_wq, &fan->work,
+ msecs_to_jiffies(1000));
+ return;
+ }
+
+ temp = max(t0, t1);
+
+ speed = fan->last_speed;
+
+ /* Determine minimum speed */
+ for (i = 0; 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 = 0; 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 = 3; /* kick start motor */
+
+ 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;
+
+ for (i = 0; i < ARRAY_SIZE(temp_limits); i++) {
+ if (temp_limits[i] < 40000 || temp_limits[i] > 70000) {
+ dev_err(&pdev->dev, "Invalid temp-limit %d (must be
between 40000 and 70000)\n",
+ temp_limits[i]);
+ return -EINVAL;
+ }
+ }
+ if (hysteresis < 1000 || hysteresis > 10000) {
+ dev_err(&pdev->dev, "Invalid hysteresis %d (must be between
1000 and 10000)\n",
+ hysteresis);
+ return -EINVAL;
+ }
+
+ fan = devm_kzalloc(&pdev->dev, sizeof(*fan), GFP_KERNEL);
+ if (!fan)
+ return -ENOMEM;
+
+ fan->dev = &pdev->dev;
+ INIT_DELAYED_WORK(&fan->work, gpd_pocket_fan_worker);
+
+ /* 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;
+}
+
+static int gpd_pocket_fan_remove(struct platform_device *pdev)
+{
+ struct gpd_pocket_fan_data *fan = platform_get_drvdata(pdev);
+
+ cancel_delayed_work_sync(&fan->work);
+ 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);
+
+ gpd_pocket_fan_set_speed(fan, 0);
+ 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,
+ .remove = gpd_pocket_fan_remove,
+ .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 <hdego...@redhat.com");
+MODULE_DESCRIPTION("GPD pocket fan driver");
+MODULE_LICENSE("GPL");
--
2.14.3
