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- // SPDX-License-Identifier: GPL-2.0
- //
- // Copyright (C) 2018 BayLibre SAS
- // Author: Bartosz Golaszewski <[email protected]>
- //
- // 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 <[email protected]>");
- MODULE_LICENSE("GPL v2");
- MODULE_ALIAS("platform:max77650-led");
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