diff options
Diffstat (limited to 'drivers/platform/x86/lenovo-yogabook-wmi.c')
| -rw-r--r-- | drivers/platform/x86/lenovo-yogabook-wmi.c | 164 |
1 files changed, 160 insertions, 4 deletions
diff --git a/drivers/platform/x86/lenovo-yogabook-wmi.c b/drivers/platform/x86/lenovo-yogabook-wmi.c index fcc18636592d..00ca9f50f0da 100644 --- a/drivers/platform/x86/lenovo-yogabook-wmi.c +++ b/drivers/platform/x86/lenovo-yogabook-wmi.c @@ -1,12 +1,24 @@ // SPDX-License-Identifier: GPL-2.0 -/* WMI driver for Lenovo Yoga Book YB1-X90* / -X91* tablets */ +/* + * Platform driver for Lenovo Yoga Book YB1-X90F/L tablets (Android model) + * WMI driver for Lenovo Yoga Book YB1-X91F/L tablets (Windows model) + * + * The keyboard half of the YB1 models can function as both a capacitive + * touch keyboard or as a Wacom digitizer, but not at the same time. + * + * This driver takes care of switching between the 2 functions. + * + * Copyright 2023 Hans de Goede <hansg@kernel.org> + */ #include <linux/acpi.h> #include <linux/gpio/consumer.h> #include <linux/gpio/machine.h> +#include <linux/i2c.h> #include <linux/interrupt.h> -#include <linux/module.h> #include <linux/leds.h> +#include <linux/module.h> +#include <linux/platform_device.h> #include <linux/wmi.h> #include <linux/workqueue.h> @@ -15,6 +27,8 @@ #define YB_KBD_BL_DEFAULT 128 #define YB_KBD_BL_MAX 255 +#define YB_PDEV_NAME "yogabook-touch-kbd-digitizer-switch" + /* flags */ enum { YB_KBD_IS_ON, @@ -31,8 +45,11 @@ struct yogabook_data { struct device *kbd_dev; struct device *dig_dev; struct led_classdev *pen_led; + struct gpio_desc *pen_touch_event; + struct gpio_desc *kbd_bl_led_enable; struct gpio_desc *backside_hall_gpio; int (*set_kbd_backlight)(struct yogabook_data *data, uint8_t level); + int pen_touch_irq; int backside_hall_irq; struct work_struct work; struct led_classdev kbd_bl_led; @@ -272,6 +289,8 @@ static int yogabook_resume(struct device *dev) static DEFINE_SIMPLE_DEV_PM_OPS(yogabook_pm_ops, yogabook_suspend, yogabook_resume); +/********** WMI driver code **********/ + /* * To control keyboard backlight, call the method KBLC() of the TCS1 ACPI * device (Goodix touchpad acts as virtual sensor keyboard). @@ -390,8 +409,145 @@ static struct wmi_driver yogabook_wmi_driver = { .remove = yogabook_wmi_remove, .notify = yogabook_wmi_notify, }; -module_wmi_driver(yogabook_wmi_driver); +/********** platform driver code **********/ + +static struct gpiod_lookup_table yogabook_pdev_gpios = { + .dev_id = YB_PDEV_NAME, + .table = { + GPIO_LOOKUP("INT33FF:00", 95, "pen_touch_event", GPIO_ACTIVE_HIGH), + GPIO_LOOKUP("INT33FF:03", 52, "enable_keyboard_led", GPIO_ACTIVE_HIGH), + {} + }, +}; + +static int yogabook_pdev_set_kbd_backlight(struct yogabook_data *data, u8 level) +{ + gpiod_set_value(data->kbd_bl_led_enable, level ? 1 : 0); + return 0; +} + +static irqreturn_t yogabook_pen_touch_irq(int irq, void *data) +{ + yogabook_toggle_digitizer_mode(data); + return IRQ_HANDLED; +} + +static int yogabook_pdev_probe(struct platform_device *pdev) +{ + struct device *dev = &pdev->dev; + struct yogabook_data *data; + int r; + + data = devm_kzalloc(dev, sizeof(*data), GFP_KERNEL); + if (data == NULL) + return -ENOMEM; + + data->kbd_dev = bus_find_device_by_name(&i2c_bus_type, NULL, "i2c-goodix_ts"); + if (!data->kbd_dev || !data->kbd_dev->driver) { + r = -EPROBE_DEFER; + goto error_put_devs; + } + + data->dig_dev = bus_find_device_by_name(&i2c_bus_type, NULL, "i2c-wacom"); + if (!data->dig_dev || !data->dig_dev->driver) { + r = -EPROBE_DEFER; + goto error_put_devs; + } + + gpiod_add_lookup_table(&yogabook_pdev_gpios); + data->pen_touch_event = devm_gpiod_get(dev, "pen_touch_event", GPIOD_IN); + data->kbd_bl_led_enable = devm_gpiod_get(dev, "enable_keyboard_led", GPIOD_OUT_HIGH); + gpiod_remove_lookup_table(&yogabook_pdev_gpios); + + if (IS_ERR(data->pen_touch_event)) { + r = dev_err_probe(dev, PTR_ERR(data->pen_touch_event), + "Getting pen_touch_event GPIO\n"); + goto error_put_devs; + } + + if (IS_ERR(data->kbd_bl_led_enable)) { + r = dev_err_probe(dev, PTR_ERR(data->kbd_bl_led_enable), + "Getting enable_keyboard_led GPIO\n"); + goto error_put_devs; + } + + r = gpiod_to_irq(data->pen_touch_event); + if (r < 0) { + dev_err_probe(dev, r, "Getting pen_touch_event IRQ\n"); + goto error_put_devs; + } + data->pen_touch_irq = r; + + r = request_irq(data->pen_touch_irq, yogabook_pen_touch_irq, IRQF_TRIGGER_FALLING, + "pen_touch_event", data); + if (r) { + dev_err_probe(dev, r, "Requesting pen_touch_event IRQ\n"); + goto error_put_devs; + } + + data->set_kbd_backlight = yogabook_pdev_set_kbd_backlight; + + r = yogabook_probe(dev, data, "yogabook::kbd_backlight"); + if (r) + goto error_free_irq; + + return 0; + +error_free_irq: + free_irq(data->pen_touch_irq, data); + cancel_work_sync(&data->work); +error_put_devs: + put_device(data->dig_dev); + put_device(data->kbd_dev); + return r; +} + +static void yogabook_pdev_remove(struct platform_device *pdev) +{ + struct yogabook_data *data = platform_get_drvdata(pdev); + + yogabook_remove(data); + free_irq(data->pen_touch_irq, data); + cancel_work_sync(&data->work); + put_device(data->dig_dev); + put_device(data->kbd_dev); +} + +static struct platform_driver yogabook_pdev_driver = { + .probe = yogabook_pdev_probe, + .remove_new = yogabook_pdev_remove, + .driver = { + .name = YB_PDEV_NAME, + .pm = pm_sleep_ptr(&yogabook_pm_ops), + }, +}; + +static int __init yogabook_module_init(void) +{ + int r; + + r = wmi_driver_register(&yogabook_wmi_driver); + if (r) + return r; + + r = platform_driver_register(&yogabook_pdev_driver); + if (r) + wmi_driver_unregister(&yogabook_wmi_driver); + + return r; +} + +static void __exit yogabook_module_exit(void) +{ + platform_driver_unregister(&yogabook_pdev_driver); + wmi_driver_unregister(&yogabook_wmi_driver); +} + +module_init(yogabook_module_init); +module_exit(yogabook_module_exit); + +MODULE_ALIAS("platform:" YB_PDEV_NAME); MODULE_AUTHOR("Yauhen Kharuzhy"); -MODULE_DESCRIPTION("Lenovo Yoga Book WMI driver"); +MODULE_DESCRIPTION("Lenovo Yoga Book driver"); MODULE_LICENSE("GPL v2"); |