Messages in this thread Patch in this message | | | From | Naresh Solanki <> | Subject | [PATCH 5/5] leds: max597x: Add support for max597x | Date | Tue, 5 Jul 2022 14:22:43 +0200 |
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From: Patrick Rudolph <patrick.rudolph@9elements.com>
max597x is hot swap controller with indication led support. This driver uses DT property to configure led during boot time & also provide the led control in sysfs.
Signed-off-by: Patrick Rudolph <patrick.rudolph@9elements.com> Signed-off-by: Naresh Solanki <Naresh.Solanki@9elements.com> --- drivers/leds/Kconfig | 10 +++ drivers/leds/Makefile | 1 + drivers/leds/leds-max597x.c | 130 ++++++++++++++++++++++++++++++++++++ 3 files changed, 141 insertions(+) create mode 100644 drivers/leds/leds-max597x.c
diff --git a/drivers/leds/Kconfig b/drivers/leds/Kconfig index a49979f41eee..682748097276 100644 --- a/drivers/leds/Kconfig +++ b/drivers/leds/Kconfig @@ -598,6 +598,16 @@ config LEDS_ADP5520 To compile this driver as a module, choose M here: the module will be called leds-adp5520. +config LEDS_MAX597X + tristate "Maxim 597x leds" + depends on I2C + depends on OF + depends on LEDS_CLASS + select MFD_MAX597X + help + This driver controls a Maxim 5970/5978 indication led via I2C bus. + The MAX5970/5978 is a smart switch with 4 indication leds + config LEDS_MC13783 tristate "LED Support for MC13XXX PMIC" depends on LEDS_CLASS diff --git a/drivers/leds/Makefile b/drivers/leds/Makefile index 4fd2f92cd198..c44b0e9559ab 100644 --- a/drivers/leds/Makefile +++ b/drivers/leds/Makefile @@ -54,6 +54,7 @@ obj-$(CONFIG_LEDS_LP8501) += leds-lp8501.o obj-$(CONFIG_LEDS_LP8788) += leds-lp8788.o obj-$(CONFIG_LEDS_LP8860) += leds-lp8860.o obj-$(CONFIG_LEDS_LT3593) += leds-lt3593.o +obj-$(CONFIG_LEDS_MAX597X) += leds-max597x.o obj-$(CONFIG_LEDS_MAX77650) += leds-max77650.o obj-$(CONFIG_LEDS_MAX8997) += leds-max8997.o obj-$(CONFIG_LEDS_MC13783) += leds-mc13783.o diff --git a/drivers/leds/leds-max597x.c b/drivers/leds/leds-max597x.c new file mode 100644 index 000000000000..645d6cdcfa34 --- /dev/null +++ b/drivers/leds/leds-max597x.c @@ -0,0 +1,130 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Device driver for regulators in MAX5970 and MAX5978 IC + * + * Copyright (c) 2022 9elements GmbH + * + * Author: Patrick Rudolph <patrick.rudolph@9elements.com> + */ + +#include <linux/bitops.h> +#include <linux/device.h> +#include <linux/err.h> +#include <linux/leds.h> +#include <linux/module.h> +#include <linux/io.h> +#include <linux/of.h> +#include <linux/i2c.h> +#include <linux/mfd/max597x.h> +#include <linux/regmap.h> +#include <linux/version.h> +#include <linux/platform_device.h> + +struct max597x_led { + struct regmap *regmap; + struct led_classdev led; + unsigned int index; +}; + +static int max597x_led_set_brightness(struct led_classdev *cdev, + enum led_brightness brightness) +{ + struct max597x_led *led = cdev->driver_data; + int ret; + + if (!led || !led->regmap) + return -1; + + ret = regmap_update_bits(led->regmap, MAX5970_REG_LED_FLASH, + 1 << led->index, ~brightness << led->index); + if (ret < 0) + dev_err(cdev->dev, "failed to set brightness %d\n", ret); + return ret; +} + +static int max597x_led(struct max597x_data *max597x, struct device_node *nc, u32 reg) +{ + struct max597x_led *led; + const char *state; + int ret = 0; + + led = devm_kzalloc(max597x->dev, sizeof(struct max597x_led), + GFP_KERNEL); + if (!led) + return -ENOMEM; + + if (of_property_read_string(nc, "label", &led->led.name)) + led->led.name = nc->name; + + led->led.max_brightness = 1; + led->led.brightness_set_blocking = max597x_led_set_brightness; + led->led.default_trigger = "none"; + led->index = reg; + led->regmap = max597x->regmap; + ret = led_classdev_register(max597x->dev, &led->led); + if (ret) { + dev_err(max597x->dev, "Error in initializing led %s", led->led.name); + devm_kfree(max597x->dev, led); + return ret; + } + led->led.driver_data = led; + led->led.dev = max597x->dev; + if (!of_property_read_string(nc, "default-state", &state)) { + if (!strcmp(state, "on")) { + led->led.brightness = 1; + led_set_brightness(&led->led, led->led.brightness); + } + } + return 0; +} + +static int max597x_led_probe(struct platform_device *pdev) +{ + + + struct max597x_data *max597x = dev_get_drvdata(pdev->dev.parent); + struct device_node *np = dev_of_node(pdev->dev.parent); + struct device_node *led_node; + struct device_node *child; + int ret = 0; + + + led_node = of_get_child_by_name(np, "leds"); + if (!led_node) + return -ENODEV; + + for_each_available_child_of_node(led_node, child) { + u32 reg; + + if (of_property_read_u32(child, "reg", ®)) + continue; + + if (reg >= MAX597X_NUM_LEDS) { + dev_err(max597x->dev, "invalid LED (%u >= %d)\n", reg, + MAX597X_NUM_LEDS); + continue; + } + + ret = max597x_led(max597x, child, reg); + if (ret < 0) { + of_node_put(child); + return ret; + } + } + + return ret; +} + +static struct platform_driver max597x_led_driver = { + .driver = { + .name = "max597x-led", + }, + .probe = max597x_led_probe, +}; + +module_platform_driver(max597x_led_driver); + + +MODULE_AUTHOR("Patrick Rudolph <patrick.rudolph@9elements.com>"); +MODULE_DESCRIPTION("MAX5970_hot-swap controller driver"); +MODULE_LICENSE("GPL v2"); -- 2.35.3
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