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 <[email protected]> --- drivers/leds/Kconfig | 7 ++ drivers/leds/Makefile | 1 + drivers/leds/leds-axp20x.c | 240 +++++++++++++++++++++++++++++++++++++ drivers/mfd/axp20x.c | 3 + 4 files changed, 251 insertions(+) create mode 100644 drivers/leds/leds-axp20x.c diff --git a/drivers/leds/Kconfig b/drivers/leds/Kconfig index d82f1dea37111..80a3f31f6f4c3 100644 --- a/drivers/leds/Kconfig +++ b/drivers/leds/Kconfig @@ -846,6 +846,13 @@ config LEDS_TPS6105X It is a single boost converter primarily for white LEDs and audio amplifiers. +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. + comment "LED Triggers" source "drivers/leds/trigger/Kconfig" diff --git a/drivers/leds/Makefile b/drivers/leds/Makefile index d7e1107753fb1..80ea1bc4744b0 100644 --- a/drivers/leds/Makefile +++ b/drivers/leds/Makefile @@ -86,6 +86,7 @@ obj-$(CONFIG_LEDS_TI_LMU_COMMON) += leds-ti-lmu-common.o obj-$(CONFIG_LEDS_LM3697) += leds-lm3697.o obj-$(CONFIG_LEDS_LM36274) += leds-lm36274.o obj-$(CONFIG_LEDS_TPS6105X) += leds-tps6105x.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 0000000000000..e6c9853b84d52 --- /dev/null +++ b/drivers/leds/leds-axp20x.c @@ -0,0 +1,240 @@ +// SPDX-License-Identifier: GPL-2.0-or-later +/* + * LED Driver for X-Powers AXP813 PMIC and similar. + * + * Copyright(c) 2020 Ondrej Jirman <[email protected]> + */ + +#include <linux/module.h> +#include <linux/kernel.h> +#include <linux/platform_device.h> +#include <linux/leds.h> +#include <linux/slab.h> +#include <linux/of.h> +#include <linux/of_device.h> +#include <linux/mfd/axp20x.h> + +#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) + +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 ssize_t charger_control_show(struct device *dev, + struct device_attribute *attr, char *buf) +{ + struct led_classdev *led_cdev = dev_get_drvdata(dev); + struct axp20x_led *led = + container_of(led_cdev, struct axp20x_led, cdev); + unsigned int val; + int ret; + + ret = regmap_read(led->regmap, AXP20X_OFF_CTRL, &val); + if (ret) + return ret; + + return scnprintf(buf, PAGE_SIZE, "%u\n", + val & AXP20X_CHGLED_CTRL_MASK ? 1 : 0); +} + +static ssize_t charger_control_store(struct device *dev, + struct device_attribute *attr, + const char *buf, size_t len) +{ + struct led_classdev *led_cdev = dev_get_drvdata(dev); + struct axp20x_led *led = + container_of(led_cdev, struct axp20x_led, cdev); + bool status; + int ret; + + ret = kstrtobool(buf, &status); + if (ret) + return ret; + + ret = regmap_update_bits(led->regmap, AXP20X_OFF_CTRL, + AXP20X_CHGLED_CTRL_MASK, + status ? AXP20X_CHGLED_CTRL_CHARGER : + AXP20X_CHGLED_CTRL_USER); + if (ret) + return ret; + + return len; +} + +static ssize_t charger_mode_show(struct device *dev, + struct device_attribute *attr, char *buf) +{ + struct led_classdev *led_cdev = dev_get_drvdata(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 = dev_get_drvdata(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_control); +static DEVICE_ATTR_RW(charger_mode); + +static struct attribute *axp20x_led_attrs[] = { + &dev_attr_charger_control.attr, + &dev_attr_charger_mode.attr, + NULL, +}; + +ATTRIBUTE_GROUPS(axp20x_led); + +static int axp20x_led_probe(struct platform_device *pdev) +{ + struct axp20x_dev *axp20x; + struct axp20x_led *led; + 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.groups = axp20x_led_groups, + + ret = devm_led_classdev_register(pdev->dev.parent, &led->cdev); + if (ret) { + dev_err(&pdev->dev, "Failed to register device %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); + + regmap_update_bits(led->regmap, AXP20X_OFF_CTRL, + AXP20X_CHGLED_CTRL_MASK, + AXP20X_CHGLED_CTRL_CHARGER); +} + +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, +}; + +module_platform_driver(axp20x_led_driver); + +MODULE_AUTHOR("Ondrej Jirman <[email protected]>"); +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 aa59496e43768..dcd68397b9d23 100644 --- a/drivers/mfd/axp20x.c +++ b/drivers/mfd/axp20x.c @@ -806,6 +806,9 @@ 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", }, }; -- 2.25.1 -- You received this message because you are subscribed to the Google Groups "linux-sunxi" group. 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