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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>
129 lines
3.4 KiB
C
129 lines
3.4 KiB
C
// SPDX-License-Identifier: GPL-2.0+
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#include <linux/leds.h>
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#include <linux/module.h>
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#include <linux/platform_device.h>
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#include <linux/regmap.h>
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#define A500_EC_LED_DELAY_USEC (100 * 1000)
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enum {
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REG_RESET_LEDS = 0x40,
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REG_POWER_LED_ON = 0x42,
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REG_CHARGE_LED_ON = 0x43,
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REG_ANDROID_LEDS_OFF = 0x5a,
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};
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struct a500_led {
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struct led_classdev cdev;
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const struct reg_sequence *enable_seq;
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struct a500_led *other;
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struct regmap *rmap;
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};
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static const struct reg_sequence a500_ec_leds_reset_seq[] = {
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REG_SEQ(REG_RESET_LEDS, 0x0, A500_EC_LED_DELAY_USEC),
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REG_SEQ(REG_ANDROID_LEDS_OFF, 0x0, A500_EC_LED_DELAY_USEC),
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};
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static const struct reg_sequence a500_ec_white_led_enable_seq[] = {
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REG_SEQ(REG_POWER_LED_ON, 0x0, A500_EC_LED_DELAY_USEC),
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};
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static const struct reg_sequence a500_ec_orange_led_enable_seq[] = {
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REG_SEQ(REG_CHARGE_LED_ON, 0x0, A500_EC_LED_DELAY_USEC),
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};
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static int a500_ec_led_brightness_set(struct led_classdev *led_cdev,
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enum led_brightness value)
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{
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struct a500_led *led = container_of(led_cdev, struct a500_led, cdev);
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struct reg_sequence control_seq[2];
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unsigned int num_regs = 1;
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if (value) {
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control_seq[0] = led->enable_seq[0];
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} else {
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/*
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* There is no separate controls which can disable LEDs
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* individually, there is only RESET_LEDS command that turns
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* off both LEDs.
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*
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* RESET_LEDS turns off both LEDs, thus restore other LED if
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* it's turned ON.
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*/
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if (led->other->cdev.brightness)
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num_regs = 2;
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control_seq[0] = a500_ec_leds_reset_seq[0];
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control_seq[1] = led->other->enable_seq[0];
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}
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return regmap_multi_reg_write(led->rmap, control_seq, num_regs);
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}
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static int a500_ec_leds_probe(struct platform_device *pdev)
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{
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struct a500_led *white_led, *orange_led;
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struct regmap *rmap;
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int err;
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rmap = dev_get_regmap(pdev->dev.parent, "KB930");
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if (!rmap)
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return -EINVAL;
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/* reset and turn off LEDs */
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regmap_multi_reg_write(rmap, a500_ec_leds_reset_seq, 2);
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white_led = devm_kzalloc(&pdev->dev, sizeof(*white_led), GFP_KERNEL);
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if (!white_led)
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return -ENOMEM;
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white_led->cdev.name = "power:white";
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white_led->cdev.brightness_set_blocking = a500_ec_led_brightness_set;
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white_led->cdev.flags = LED_CORE_SUSPENDRESUME;
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white_led->cdev.max_brightness = 1;
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white_led->enable_seq = a500_ec_white_led_enable_seq;
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white_led->rmap = rmap;
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orange_led = devm_kzalloc(&pdev->dev, sizeof(*orange_led), GFP_KERNEL);
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if (!orange_led)
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return -ENOMEM;
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orange_led->cdev.name = "power:orange";
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orange_led->cdev.brightness_set_blocking = a500_ec_led_brightness_set;
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orange_led->cdev.flags = LED_CORE_SUSPENDRESUME;
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orange_led->cdev.max_brightness = 1;
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orange_led->enable_seq = a500_ec_orange_led_enable_seq;
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orange_led->rmap = rmap;
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white_led->other = orange_led;
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orange_led->other = white_led;
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err = devm_led_classdev_register(&pdev->dev, &white_led->cdev);
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if (err) {
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dev_err(&pdev->dev, "failed to register white LED\n");
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return err;
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}
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err = devm_led_classdev_register(&pdev->dev, &orange_led->cdev);
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if (err) {
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dev_err(&pdev->dev, "failed to register orange LED\n");
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return err;
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}
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return 0;
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}
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static struct platform_driver a500_ec_leds_driver = {
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.driver = {
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.name = "acer-a500-iconia-leds",
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},
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.probe = a500_ec_leds_probe,
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};
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module_platform_driver(a500_ec_leds_driver);
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MODULE_DESCRIPTION("LED driver for Acer Iconia Tab A500 Power Button");
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MODULE_AUTHOR("Dmitry Osipenko <digetx@gmail.com>");
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MODULE_ALIAS("platform:acer-a500-iconia-leds");
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MODULE_LICENSE("GPL");
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