From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001 From: =?UTF-8?q?Ond=C5=99ej=20Jirman?= Date: Thu, 4 Feb 2021 00:55:20 +0100 Subject: leds: axp20x: Support charger LED on AXP20x like PMICs There is single LED that can be turned on and off by the user, or set to be controlled by the charger in 2 different modes. The driver initializes the LED to be controlled by the charger, but allows to switch it to user control, and change the mode of charging indication via a sysfs. The driver was developed on AXP813, but should work on other PMICs like that without changes. Signed-off-by: Ondrej Jirman --- drivers/leds/Kconfig | 15 + drivers/leds/Makefile | 1 + drivers/leds/leds-axp20x.c | 255 ++++++++++ drivers/mfd/axp20x.c | 3 + 4 files changed, 274 insertions(+) diff --git a/drivers/leds/Kconfig b/drivers/leds/Kconfig index 6292fddcc55c..e2f4ebe6a2dd 100644 --- a/drivers/leds/Kconfig +++ b/drivers/leds/Kconfig @@ -885,6 +885,14 @@ config LEDS_IP30 To compile this driver as a module, choose M here: the module will be called leds-ip30. +config LEDS_SGM3140 + tristate "LED support for the SGM3140" + depends on LEDS_CLASS_FLASH + depends on V4L2_FLASH_LED_CLASS || !V4L2_FLASH_LED_CLASS + help + This option enables support for the SGM3140 500mA Buck/Boost Charge + Pump LED Driver. + config LEDS_ACER_A500 tristate "Power button LED support for Acer Iconia Tab A500" depends on LEDS_CLASS && MFD_ACER_A500_EC @@ -892,6 +900,13 @@ config LEDS_ACER_A500 This option enables support for the Power Button LED of Acer Iconia Tab A500. +config LEDS_AXP20X + tristate "Charger LED support for AXP20X-like PMICs (AXP813, ...)" + depends on LEDS_CLASS && MFD_AXP20X + help + This option enables support for on-chip LED driver on + AXP20X-like PMICs. + source "drivers/leds/blink/Kconfig" comment "Flash and Torch LED drivers" diff --git a/drivers/leds/Makefile b/drivers/leds/Makefile index d7348e8bc019..679153c22b54 100644 --- a/drivers/leds/Makefile +++ b/drivers/leds/Makefile @@ -88,6 +88,7 @@ obj-$(CONFIG_LEDS_TURRIS_OMNIA) += leds-turris-omnia.o obj-$(CONFIG_LEDS_WM831X_STATUS) += leds-wm831x-status.o obj-$(CONFIG_LEDS_WM8350) += leds-wm8350.o obj-$(CONFIG_LEDS_WRAP) += leds-wrap.o +obj-$(CONFIG_LEDS_AXP20X) += leds-axp20x.o # LED SPI Drivers obj-$(CONFIG_LEDS_CR0014114) += leds-cr0014114.o diff --git a/drivers/leds/leds-axp20x.c b/drivers/leds/leds-axp20x.c new file mode 100644 index 000000000000..fd94930f6433 --- /dev/null +++ b/drivers/leds/leds-axp20x.c @@ -0,0 +1,255 @@ +// 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"); diff --git a/drivers/mfd/axp20x.c b/drivers/mfd/axp20x.c index c4195c6e6f12..bc45e8c2bcba 100644 --- a/drivers/mfd/axp20x.c +++ b/drivers/mfd/axp20x.c @@ -1127,6 +1127,9 @@ static const struct mfd_cell axp813_cells[] = { .num_resources = ARRAY_SIZE(axp803_usb_power_supply_resources), .resources = axp803_usb_power_supply_resources, .of_compatible = "x-powers,axp813-usb-power-supply", + }, { + .name = "axp20x-charger-led", + .of_compatible = "x-powers,axp813-charger-led", }, }; -- Armbian