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// 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");
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