diff options
Diffstat (limited to 'drivers/leds/leds-max77650.c')
| -rw-r--r-- | drivers/leds/leds-max77650.c | 148 |
1 files changed, 148 insertions, 0 deletions
diff --git a/drivers/leds/leds-max77650.c b/drivers/leds/leds-max77650.c new file mode 100644 index 0000000000..1eeac56b00 --- /dev/null +++ b/drivers/leds/leds-max77650.c @@ -0,0 +1,148 @@ +// SPDX-License-Identifier: GPL-2.0 +// +// Copyright (C) 2018 BayLibre SAS +// Author: Bartosz Golaszewski <bgolaszewski@baylibre.com> +// +// LED driver for MAXIM 77650/77651 charger/power-supply. + +#include <linux/i2c.h> +#include <linux/leds.h> +#include <linux/mfd/max77650.h> +#include <linux/module.h> +#include <linux/platform_device.h> +#include <linux/regmap.h> + +#define MAX77650_LED_NUM_LEDS 3 + +#define MAX77650_LED_A_BASE 0x40 +#define MAX77650_LED_B_BASE 0x43 + +#define MAX77650_LED_BR_MASK GENMASK(4, 0) +#define MAX77650_LED_EN_MASK GENMASK(7, 6) + +#define MAX77650_LED_MAX_BRIGHTNESS MAX77650_LED_BR_MASK + +/* Enable EN_LED_MSTR. */ +#define MAX77650_LED_TOP_DEFAULT BIT(0) + +#define MAX77650_LED_ENABLE GENMASK(7, 6) +#define MAX77650_LED_DISABLE 0x00 + +#define MAX77650_LED_A_DEFAULT MAX77650_LED_DISABLE +/* 100% on duty */ +#define MAX77650_LED_B_DEFAULT GENMASK(3, 0) + +struct max77650_led { + struct led_classdev cdev; + struct regmap *map; + unsigned int regA; + unsigned int regB; +}; + +static struct max77650_led *max77650_to_led(struct led_classdev *cdev) +{ + return container_of(cdev, struct max77650_led, cdev); +} + +static int max77650_led_brightness_set(struct led_classdev *cdev, + enum led_brightness brightness) +{ + struct max77650_led *led = max77650_to_led(cdev); + int val, mask; + + mask = MAX77650_LED_BR_MASK | MAX77650_LED_EN_MASK; + + if (brightness == LED_OFF) + val = MAX77650_LED_DISABLE; + else + val = MAX77650_LED_ENABLE | brightness; + + return regmap_update_bits(led->map, led->regA, mask, val); +} + +static int max77650_led_probe(struct platform_device *pdev) +{ + struct fwnode_handle *child; + struct max77650_led *leds, *led; + struct device *dev; + struct regmap *map; + int rv, num_leds; + u32 reg; + + dev = &pdev->dev; + + leds = devm_kcalloc(dev, sizeof(*leds), + MAX77650_LED_NUM_LEDS, GFP_KERNEL); + if (!leds) + return -ENOMEM; + + map = dev_get_regmap(dev->parent, NULL); + if (!map) + return -ENODEV; + + num_leds = device_get_child_node_count(dev); + if (!num_leds || num_leds > MAX77650_LED_NUM_LEDS) + return -ENODEV; + + device_for_each_child_node(dev, child) { + struct led_init_data init_data = {}; + + rv = fwnode_property_read_u32(child, "reg", ®); + if (rv || reg >= MAX77650_LED_NUM_LEDS) { + rv = -EINVAL; + goto err_node_put; + } + + led = &leds[reg]; + led->map = map; + led->regA = MAX77650_LED_A_BASE + reg; + led->regB = MAX77650_LED_B_BASE + reg; + led->cdev.brightness_set_blocking = max77650_led_brightness_set; + led->cdev.max_brightness = MAX77650_LED_MAX_BRIGHTNESS; + + init_data.fwnode = child; + init_data.devicename = "max77650"; + /* for backwards compatibility if `label` is not present */ + init_data.default_label = ":"; + + rv = devm_led_classdev_register_ext(dev, &led->cdev, + &init_data); + if (rv) + goto err_node_put; + + rv = regmap_write(map, led->regA, MAX77650_LED_A_DEFAULT); + if (rv) + goto err_node_put; + + rv = regmap_write(map, led->regB, MAX77650_LED_B_DEFAULT); + if (rv) + goto err_node_put; + } + + return regmap_write(map, + MAX77650_REG_CNFG_LED_TOP, + MAX77650_LED_TOP_DEFAULT); +err_node_put: + fwnode_handle_put(child); + return rv; +} + +static const struct of_device_id max77650_led_of_match[] = { + { .compatible = "maxim,max77650-led" }, + { } +}; +MODULE_DEVICE_TABLE(of, max77650_led_of_match); + +static struct platform_driver max77650_led_driver = { + .driver = { + .name = "max77650-led", + .of_match_table = max77650_led_of_match, + }, + .probe = max77650_led_probe, +}; +module_platform_driver(max77650_led_driver); + +MODULE_DESCRIPTION("MAXIM 77650/77651 LED driver"); +MODULE_AUTHOR("Bartosz Golaszewski <bgolaszewski@baylibre.com>"); +MODULE_LICENSE("GPL v2"); +MODULE_ALIAS("platform:max77650-led"); |