// SPDX-License-Identifier: GPL-2.0-or-later /* * LED Driver for X-Powers AXP813 PMIC and similar. * * Copyright(c) 2020 Ondrej Jirman */ #include #include #include #include #include #include #include #include #define AXP20X_CHGLED_CTRL_MASK BIT(3) #define AXP20X_CHGLED_CTRL_CHARGER BIT(3) #define AXP20X_CHGLED_CTRL_USER 0 #define AXP20X_CHRG_CTRL2_MODE BIT(4) #define AXP20X_CHGLED_USER_STATE_MASK GENMASK(5, 4) #define AXP20X_CHGLED_USER_STATE_OFF (0 << 4) #define AXP20X_CHGLED_USER_STATE_BLINK_SLOW (1 << 4) #define AXP20X_CHGLED_USER_STATE_BLINK_FAST (2 << 4) #define AXP20X_CHGLED_USER_STATE_ON (3 << 4) static struct led_hw_trigger_type axp20x_charger_led_trigger_type; struct axp20x_led { struct led_classdev cdev; struct regmap *regmap; }; static int axp20x_led_set(struct led_classdev *led_cdev, enum led_brightness value) { struct axp20x_led *led = container_of(led_cdev, struct axp20x_led, cdev); unsigned int val; val = value == LED_OFF ? AXP20X_CHGLED_USER_STATE_OFF : AXP20X_CHGLED_USER_STATE_ON; return regmap_update_bits(led->regmap, AXP20X_OFF_CTRL, AXP20X_CHGLED_USER_STATE_MASK, val); } static int axp20x_set_charger_control(struct led_classdev *led_cdev, bool on) { struct axp20x_led *led = container_of(led_cdev, struct axp20x_led, cdev); return regmap_update_bits(led->regmap, AXP20X_OFF_CTRL, AXP20X_CHGLED_CTRL_MASK, on ? AXP20X_CHGLED_CTRL_CHARGER : AXP20X_CHGLED_CTRL_USER); } static int axp20x_trig_charger_activate(struct led_classdev *led_cdev) { return axp20x_set_charger_control(led_cdev, true); } static void axp20x_trig_charger_deactivate(struct led_classdev *led_cdev) { axp20x_set_charger_control(led_cdev, false); } static ssize_t charger_mode_show(struct device *dev, struct device_attribute *attr, char *buf) { struct led_classdev *led_cdev = led_trigger_get_led(dev); struct axp20x_led *led = container_of(led_cdev, struct axp20x_led, cdev); unsigned int val; int ret; ret = regmap_read(led->regmap, AXP20X_CHRG_CTRL2, &val); if (ret) return ret; return scnprintf(buf, PAGE_SIZE, "%u\n", val & AXP20X_CHRG_CTRL2_MODE ? 1 : 0); } static ssize_t charger_mode_store(struct device *dev, struct device_attribute *attr, const char *buf, size_t len) { struct led_classdev *led_cdev = led_trigger_get_led(dev); struct axp20x_led *led = container_of(led_cdev, struct axp20x_led, cdev); unsigned int mode; int ret; ret = kstrtouint(buf, 0, &mode); if (ret) return ret; if (mode > 1) return -ERANGE; ret = regmap_update_bits(led->regmap, AXP20X_CHRG_CTRL2, AXP20X_CHRG_CTRL2_MODE, mode ? AXP20X_CHRG_CTRL2_MODE : 0); if (ret) return ret; return len; } static DEVICE_ATTR_RW(charger_mode); static struct attribute *axp20x_led_attrs[] = { &dev_attr_charger_mode.attr, NULL, }; ATTRIBUTE_GROUPS(axp20x_led); static struct led_trigger axp20x_charger_led_trigger = { .name = "charger", .trigger_type = &axp20x_charger_led_trigger_type, .activate = axp20x_trig_charger_activate, .deactivate = axp20x_trig_charger_deactivate, .groups = axp20x_led_groups, }; static int axp20x_led_probe(struct platform_device *pdev) { struct axp20x_dev *axp20x; struct axp20x_led *led; unsigned int val; int ret; if (!of_device_is_available(pdev->dev.of_node)) return -ENODEV; axp20x = dev_get_drvdata(pdev->dev.parent); if (!axp20x) return -EINVAL; led = devm_kzalloc(&pdev->dev, sizeof(struct axp20x_led), GFP_KERNEL); if (!led) return -ENOMEM; platform_set_drvdata(pdev, led); led->regmap = axp20x->regmap; led->cdev.name = "axp20x-chgarger-led"; led->cdev.brightness_set_blocking = axp20x_led_set; led->cdev.brightness = LED_OFF; led->cdev.max_brightness = 1; led->cdev.trigger_type = &axp20x_charger_led_trigger_type; ret = regmap_read(led->regmap, AXP20X_OFF_CTRL, &val); if (ret) { dev_err(&pdev->dev, "Failed to read charger control status\n"); return ret; } if ((val & AXP20X_CHGLED_CTRL_MASK) == AXP20X_CHGLED_CTRL_CHARGER) led->cdev.default_trigger = axp20x_charger_led_trigger.name; ret = devm_led_classdev_register(pdev->dev.parent, &led->cdev); if (ret) { dev_err(&pdev->dev, "Failed to register led %s\n", led->cdev.name); return ret; } ret = regmap_update_bits(led->regmap, AXP20X_OFF_CTRL, AXP20X_CHGLED_CTRL_MASK, AXP20X_CHGLED_CTRL_CHARGER); if (ret) { dev_err(&pdev->dev, "Failed to enable charger control\n"); return ret; } ret = axp20x_led_set(&led->cdev, led->cdev.brightness); if (ret) { dev_err(&pdev->dev, "Failed to init led brightness\n"); return ret; } return 0; } static void axp20x_led_shutdown(struct platform_device *pdev) { struct axp20x_led *led = platform_get_drvdata(pdev); /* On shutdown, we want to give LED control back to the PMIC, * so that it doesn't stay on, while the system is off. */ axp20x_led_set(&led->cdev, LED_OFF); axp20x_set_charger_control(&led->cdev, true); } static int axp20x_led_remove(struct platform_device *pdev) { axp20x_led_shutdown(pdev); return 0; } static const struct of_device_id axp20x_leds_of_match[] = { { .compatible = "x-powers,axp813-charger-led", }, { }, }; MODULE_DEVICE_TABLE(of, axp20x_leds_of_match); static struct platform_driver axp20x_led_driver = { .driver = { .name = "leds-axp20x", .of_match_table = axp20x_leds_of_match, }, .probe = axp20x_led_probe, .remove = axp20x_led_remove, .shutdown = axp20x_led_shutdown, }; static int __init axp20x_led_driver_init(void) { int ret; ret = led_trigger_register(&axp20x_charger_led_trigger); if (ret) return ret; ret = platform_driver_register(&axp20x_led_driver); if (ret) { led_trigger_unregister(&axp20x_charger_led_trigger); return ret; } return 0; } static void __exit axp20x_led_driver_exit(void) { platform_driver_unregister(&axp20x_led_driver); led_trigger_unregister(&axp20x_charger_led_trigger); } module_init(axp20x_led_driver_init); module_exit(axp20x_led_driver_exit); MODULE_AUTHOR("Ondrej Jirman "); MODULE_DESCRIPTION("LED driver for AXP813 PMIC"); MODULE_LICENSE("GPL"); MODULE_ALIAS("platform:leds-axp20x");