diff options
Diffstat (limited to 'drivers/leds/leds-acer-a500.c')
| -rw-r--r-- | drivers/leds/leds-acer-a500.c | 129 |
1 files changed, 129 insertions, 0 deletions
diff --git a/drivers/leds/leds-acer-a500.c b/drivers/leds/leds-acer-a500.c new file mode 100644 index 000000000..8cf0b11f4 --- /dev/null +++ b/drivers/leds/leds-acer-a500.c @@ -0,0 +1,129 @@ +// 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"); |