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drivers/leds/leds-acer-a500.c
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1ece06acd leds: Add driver ... |
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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 "); return err; } err = devm_led_classdev_register(&pdev->dev, &orange_led->cdev); if (err) { dev_err(&pdev->dev, "failed to register orange LED "); 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"); |