Messages in this thread | | | Subject | Re: [PATCH 2/4] leds: axp20x: Support charger LED on AXP20x like PMICs | From | Dan Murphy <> | Date | Tue, 25 Feb 2020 06:53:58 -0600 |
| |
Ondrej
On 2/23/20 7:14 AM, Ondrej Jirman wrote: > 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 <megous@megous.com> > --- > 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 <megous@megous.com> > + */ > + > +#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";
This does not follow the LED device naming convention please refer to the leds-class.rst document
https://elixir.bootlin.com/linux/latest/source/Documentation/leds/leds-class.rst
Dan
| |