mirror of
https://github.com/torvalds/linux.git
synced 2024-11-10 06:01:57 +00:00
1ece06acd2
Acer Iconia Tab A500 is an Android tablet device which has two LEDs embedded into the Power Button. Orange LED indicates "battery charging" status and white LED indicates "wake-up/charge-done" status. The new LED driver provides control over both LEDs to userspace. Signed-off-by: Dmitry Osipenko <digetx@gmail.com> Signed-off-by: Pavel Machek <pavel@ucw.cz>
130 lines
3.4 KiB
C
130 lines
3.4 KiB
C
// SPDX-License-Identifier: GPL-2.0+
|
|
|
|
#include <linux/leds.h>
|
|
#include <linux/module.h>
|
|
#include <linux/platform_device.h>
|
|
#include <linux/regmap.h>
|
|
|
|
#define A500_EC_LED_DELAY_USEC (100 * 1000)
|
|
|
|
enum {
|
|
REG_RESET_LEDS = 0x40,
|
|
REG_POWER_LED_ON = 0x42,
|
|
REG_CHARGE_LED_ON = 0x43,
|
|
REG_ANDROID_LEDS_OFF = 0x5a,
|
|
};
|
|
|
|
struct a500_led {
|
|
struct led_classdev cdev;
|
|
const struct reg_sequence *enable_seq;
|
|
struct a500_led *other;
|
|
struct regmap *rmap;
|
|
};
|
|
|
|
static const struct reg_sequence a500_ec_leds_reset_seq[] = {
|
|
REG_SEQ(REG_RESET_LEDS, 0x0, A500_EC_LED_DELAY_USEC),
|
|
REG_SEQ(REG_ANDROID_LEDS_OFF, 0x0, A500_EC_LED_DELAY_USEC),
|
|
};
|
|
|
|
static const struct reg_sequence a500_ec_white_led_enable_seq[] = {
|
|
REG_SEQ(REG_POWER_LED_ON, 0x0, A500_EC_LED_DELAY_USEC),
|
|
};
|
|
|
|
static const struct reg_sequence a500_ec_orange_led_enable_seq[] = {
|
|
REG_SEQ(REG_CHARGE_LED_ON, 0x0, A500_EC_LED_DELAY_USEC),
|
|
};
|
|
|
|
static int a500_ec_led_brightness_set(struct led_classdev *led_cdev,
|
|
enum led_brightness value)
|
|
{
|
|
struct a500_led *led = container_of(led_cdev, struct a500_led, cdev);
|
|
struct reg_sequence control_seq[2];
|
|
unsigned int num_regs = 1;
|
|
|
|
if (value) {
|
|
control_seq[0] = led->enable_seq[0];
|
|
} else {
|
|
/*
|
|
* There is no separate controls which can disable LEDs
|
|
* individually, there is only RESET_LEDS command that turns
|
|
* off both LEDs.
|
|
*
|
|
* RESET_LEDS turns off both LEDs, thus restore other LED if
|
|
* it's turned ON.
|
|
*/
|
|
if (led->other->cdev.brightness)
|
|
num_regs = 2;
|
|
|
|
control_seq[0] = a500_ec_leds_reset_seq[0];
|
|
control_seq[1] = led->other->enable_seq[0];
|
|
}
|
|
|
|
return regmap_multi_reg_write(led->rmap, control_seq, num_regs);
|
|
}
|
|
|
|
static int a500_ec_leds_probe(struct platform_device *pdev)
|
|
{
|
|
struct a500_led *white_led, *orange_led;
|
|
struct regmap *rmap;
|
|
int err;
|
|
|
|
rmap = dev_get_regmap(pdev->dev.parent, "KB930");
|
|
if (!rmap)
|
|
return -EINVAL;
|
|
|
|
/* reset and turn off LEDs */
|
|
regmap_multi_reg_write(rmap, a500_ec_leds_reset_seq, 2);
|
|
|
|
white_led = devm_kzalloc(&pdev->dev, sizeof(*white_led), GFP_KERNEL);
|
|
if (!white_led)
|
|
return -ENOMEM;
|
|
|
|
white_led->cdev.name = "power:white";
|
|
white_led->cdev.brightness_set_blocking = a500_ec_led_brightness_set;
|
|
white_led->cdev.flags = LED_CORE_SUSPENDRESUME;
|
|
white_led->cdev.max_brightness = 1;
|
|
white_led->enable_seq = a500_ec_white_led_enable_seq;
|
|
white_led->rmap = rmap;
|
|
|
|
orange_led = devm_kzalloc(&pdev->dev, sizeof(*orange_led), GFP_KERNEL);
|
|
if (!orange_led)
|
|
return -ENOMEM;
|
|
|
|
orange_led->cdev.name = "power:orange";
|
|
orange_led->cdev.brightness_set_blocking = a500_ec_led_brightness_set;
|
|
orange_led->cdev.flags = LED_CORE_SUSPENDRESUME;
|
|
orange_led->cdev.max_brightness = 1;
|
|
orange_led->enable_seq = a500_ec_orange_led_enable_seq;
|
|
orange_led->rmap = rmap;
|
|
|
|
white_led->other = orange_led;
|
|
orange_led->other = white_led;
|
|
|
|
err = devm_led_classdev_register(&pdev->dev, &white_led->cdev);
|
|
if (err) {
|
|
dev_err(&pdev->dev, "failed to register white LED\n");
|
|
return err;
|
|
}
|
|
|
|
err = devm_led_classdev_register(&pdev->dev, &orange_led->cdev);
|
|
if (err) {
|
|
dev_err(&pdev->dev, "failed to register orange LED\n");
|
|
return err;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static struct platform_driver a500_ec_leds_driver = {
|
|
.driver = {
|
|
.name = "acer-a500-iconia-leds",
|
|
},
|
|
.probe = a500_ec_leds_probe,
|
|
};
|
|
module_platform_driver(a500_ec_leds_driver);
|
|
|
|
MODULE_DESCRIPTION("LED driver for Acer Iconia Tab A500 Power Button");
|
|
MODULE_AUTHOR("Dmitry Osipenko <digetx@gmail.com>");
|
|
MODULE_ALIAS("platform:acer-a500-iconia-leds");
|
|
MODULE_LICENSE("GPL");
|