diff options
Diffstat (limited to 'drivers/leds/leds-max5970.c')
| -rw-r--r-- | drivers/leds/leds-max5970.c | 111 |
1 files changed, 111 insertions, 0 deletions
diff --git a/drivers/leds/leds-max5970.c b/drivers/leds/leds-max5970.c new file mode 100644 index 0000000000..56a5843115 --- /dev/null +++ b/drivers/leds/leds-max5970.c @@ -0,0 +1,111 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Device driver for leds in MAX5970 and MAX5978 IC + * + * Copyright (c) 2022 9elements GmbH + * + * Author: Patrick Rudolph <patrick.rudolph@9elements.com> + */ + +#include <linux/bits.h> +#include <linux/container_of.h> +#include <linux/device.h> +#include <linux/leds.h> +#include <linux/mfd/max5970.h> +#include <linux/mod_devicetable.h> +#include <linux/module.h> +#include <linux/platform_device.h> +#include <linux/property.h> +#include <linux/regmap.h> + +#define ldev_to_maxled(c) container_of(c, struct max5970_led, cdev) + +struct max5970_led { + struct device *dev; + struct regmap *regmap; + struct led_classdev cdev; + unsigned int index; +}; + +static int max5970_led_set_brightness(struct led_classdev *cdev, + enum led_brightness brightness) +{ + struct max5970_led *ddata = ldev_to_maxled(cdev); + int ret, val; + + /* Set/clear corresponding bit for given led index */ + val = !brightness ? BIT(ddata->index) : 0; + + ret = regmap_update_bits(ddata->regmap, MAX5970_REG_LED_FLASH, BIT(ddata->index), val); + if (ret < 0) + dev_err(cdev->dev, "failed to set brightness %d", ret); + + return ret; +} + +static int max5970_led_probe(struct platform_device *pdev) +{ + struct fwnode_handle *led_node, *child; + struct device *dev = &pdev->dev; + struct regmap *regmap; + struct max5970_led *ddata; + int ret = -ENODEV; + + regmap = dev_get_regmap(dev->parent, NULL); + if (!regmap) + return -ENODEV; + + led_node = device_get_named_child_node(dev->parent, "leds"); + if (!led_node) + return -ENODEV; + + fwnode_for_each_available_child_node(led_node, child) { + u32 reg; + + if (fwnode_property_read_u32(child, "reg", ®)) + continue; + + if (reg >= MAX5970_NUM_LEDS) { + dev_err_probe(dev, -EINVAL, "invalid LED (%u >= %d)\n", reg, MAX5970_NUM_LEDS); + continue; + } + + ddata = devm_kzalloc(dev, sizeof(*ddata), GFP_KERNEL); + if (!ddata) { + fwnode_handle_put(child); + return -ENOMEM; + } + + ddata->index = reg; + ddata->regmap = regmap; + ddata->dev = dev; + + if (fwnode_property_read_string(child, "label", &ddata->cdev.name)) + ddata->cdev.name = fwnode_get_name(child); + + ddata->cdev.max_brightness = 1; + ddata->cdev.brightness_set_blocking = max5970_led_set_brightness; + ddata->cdev.default_trigger = "none"; + + ret = devm_led_classdev_register(dev, &ddata->cdev); + if (ret < 0) { + fwnode_handle_put(child); + return dev_err_probe(dev, ret, "Failed to initialize LED %u\n", reg); + } + } + + return ret; +} + +static struct platform_driver max5970_led_driver = { + .driver = { + .name = "max5970-led", + }, + .probe = max5970_led_probe, +}; +module_platform_driver(max5970_led_driver); + +MODULE_AUTHOR("Patrick Rudolph <patrick.rudolph@9elements.com>"); +MODULE_AUTHOR("Naresh Solanki <Naresh.Solanki@9elements.com>"); +MODULE_DESCRIPTION("MAX5970_hot-swap controller LED driver"); +MODULE_LICENSE("GPL"); |