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platform/x86: lenovo-yogabook: Add platform driver support

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The Lenovo Yoga Book 1 comes in 2 versions.

Version 1: The yb1-x91f/l currently supported by lenovo-yogabook-wmi, which
has a WMI interface to deal with toggling the keyboard half between
touch-keyboard and wacom-digitizer mode.

Version 2: The yb1-x90f/l which is the same hardware shipping with Android
as factory OS. This version has a very different BIOS and ACPI tables which
lack the WMI interface.

Instead the x86-android-tablets.ko code which does devices instantiation
for devices missing from ACPI on various x86 Android tablets will
instantiate a platform device for the keyboard half touch-kbd/digitizer
toggle functionality.

This patch adds a platform driver to the lenovo-yogabook code which binds
to the platform device instantiated by x86-android-tablets.ko offering
touch-kbd/digitizer toggle functionality on the Android model.

Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Link: https://lore.kernel.org/r/20230430165807.472798-18-hdegoede@redhat.com
This commit is contained in:
Hans de Goede 2023-04-30 18:58:05 +02:00
parent 37b599ae3f
commit 6df1523fa0
1 changed files with 160 additions and 4 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

164
drivers/platform/x86/lenovo-yogabook-wmi.c
View file

@ -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");