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Message-Id: <20171212151102.18672-1-hdegoede@redhat.com> Date: Tue, 12 Dec 2017 16:11:02 +0100 From: Hans de Goede <hdegoede@...hat.com> To: Darren Hart <dvhart@...radead.org>, Andy Shevchenko <andy@...radead.org> Cc: Hans de Goede <hdegoede@...hat.com>, platform-driver-x86@...r.kernel.org, linux-kernel@...r.kernel.org, James <james@...aceas.org> Subject: [PATCH] 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 <james@...aceas.org> Suggested-by: James <james@...aceas.org> Signed-off-by: Hans de Goede <hdegoede@...hat.com> --- 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-input@...r.kernel.org S: Maintained F: drivers/input/touchscreen/goodix.c +GPD POCKET FAN DRIVER +M: Hans de Goede <hdegoede@...hat.com> +L: platform-driver-x86@...r.kernel.org +S: Maintained +F: drivers/platform/x86/gpd-pocket-fan.c + GPIO ACPI SUPPORT M: Mika Westerberg <mika.westerberg@...ux.intel.com> M: Andy Shevchenko <andriy.shevchenko@...ux.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..3f3e8a7d4dee --- /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 <hdegoede@...hat.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 <hdegoede@...hat.com"); +MODULE_DESCRIPTION("GPD pocket fan driver"); +MODULE_LICENSE("GPL"); -- 2.14.3
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