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platform/x86: x86-android-tablets: Create LED device for Xiaomi Pad 2 bottom bezel touch buttons

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The Xiaomi [Mi]Pad 2 has 3 menu / home / back capacitive touch-buttons
on its bottom bezel. These are backlit by LEDs attached to a TPS61158 LED
controller which is controlled by the "pwm_soc_lpss_2" PWM output.

Create a LED class device for this, using the new input-events trigger
as default trigger so that the buttons automatically light up on any
input activity.

Note alternatively a "leds_pwm" platform device could be created together
with the necessary fwnode_s_ and a fwnode link to the PWM controller.
There are 2 downsides to this approach:

1. The code would still need to pwm_get() the PWM controller to get/attach
a fwnode for the PWM controller fwnode link and setting up the necessary
fwnodes is non-trivial. So this would likely require more code then simply
registering the LED class device directly.

2. Currently the leds_pwm driver and its devicetree bindings do not support
limiting the maximum dutycycle to less then 100% which is required in this
case (the leds_pwm driver can probably be extended to allow this).

Reviewed-by: Ilpo Järvinen <ilpo.jarvinen@linux.intel.com>
Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Link: https://lore.kernel.org/r/20240509141207.63570-2-hdegoede@redhat.com
This commit is contained in:
Hans de Goede 2024-05-09 16:12:06 +02:00
parent 0b57e2e43c
commit 9426adb032
1 changed files with 47 additions and 0 deletions
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47
drivers/platform/x86/x86-android-tablets/other.c
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@ -11,7 +11,9 @@
#include <linux/acpi.h>
#include <linux/gpio/machine.h>
#include <linux/input.h>
#include <linux/leds.h>
#include <linux/platform_device.h>
#include <linux/pwm.h>
#include <dt-bindings/leds/common.h>
@ -662,8 +664,53 @@ static const struct software_node *ktd2026_node_group[] = {
NULL
};
/*
* For the LEDs which backlight the menu / home / back capacitive buttons on
* the bottom bezel. These are attached to a TPS61158 LED controller which
* is controlled by the "pwm_soc_lpss_2" PWM output.
*/
#define XIAOMI_MIPAD2_LED_PERIOD_NS 19200
#define XIAOMI_MIPAD2_LED_DEFAULT_DUTY 6000 /* From Android kernel */
static struct pwm_device *xiaomi_mipad2_led_pwm;
static int xiaomi_mipad2_brightness_set(struct led_classdev *led_cdev,
enum led_brightness val)
{
struct pwm_state state = {
.period = XIAOMI_MIPAD2_LED_PERIOD_NS,
.duty_cycle = val,
/* Always set PWM enabled to avoid the pin floating */
.enabled = true,
};
return pwm_apply_might_sleep(xiaomi_mipad2_led_pwm, &state);
}
static int __init xiaomi_mipad2_init(struct device *dev)
{
struct led_classdev *led_cdev;
int ret;
xiaomi_mipad2_led_pwm = devm_pwm_get(dev, "pwm_soc_lpss_2");
if (IS_ERR(xiaomi_mipad2_led_pwm))
return dev_err_probe(dev, PTR_ERR(xiaomi_mipad2_led_pwm), "getting pwm\n");
led_cdev = devm_kzalloc(dev, sizeof(*led_cdev), GFP_KERNEL);
if (!led_cdev)
return -ENOMEM;
led_cdev->name = "mipad2:white:touch-buttons-backlight";
led_cdev->max_brightness = XIAOMI_MIPAD2_LED_PERIOD_NS;
/* "input-events" trigger uses blink_brightness */
led_cdev->blink_brightness = XIAOMI_MIPAD2_LED_DEFAULT_DUTY;
led_cdev->default_trigger = "input-events";
led_cdev->brightness_set_blocking = xiaomi_mipad2_brightness_set;
ret = devm_led_classdev_register(dev, led_cdev);
if (ret)
return dev_err_probe(dev, ret, "registering LED\n");
return software_node_register_node_group(ktd2026_node_group);
}