forked from mirrors/linux
5be102eb16
This adds basic support for LEDs for the max77650 PMIC. The device has three current sinks for driving LEDs. Signed-off-by: Bartosz Golaszewski <bgolaszewski@baylibre.com> Acked-by: Jacek Anaszewski <jacek.anaszewski@gmail.com> Acked-by: Pavel Machek <pavel@ucw.cz> Signed-off-by: Lee Jones <lee.jones@linaro.org>
147 lines
3.5 KiB
C
147 lines
3.5 KiB
C
// SPDX-License-Identifier: GPL-2.0
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//
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// Copyright (C) 2018 BayLibre SAS
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// Author: Bartosz Golaszewski <bgolaszewski@baylibre.com>
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//
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// LED driver for MAXIM 77650/77651 charger/power-supply.
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#include <linux/i2c.h>
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#include <linux/leds.h>
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#include <linux/mfd/max77650.h>
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#include <linux/module.h>
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#include <linux/platform_device.h>
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#include <linux/regmap.h>
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#define MAX77650_LED_NUM_LEDS 3
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#define MAX77650_LED_A_BASE 0x40
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#define MAX77650_LED_B_BASE 0x43
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#define MAX77650_LED_BR_MASK GENMASK(4, 0)
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#define MAX77650_LED_EN_MASK GENMASK(7, 6)
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#define MAX77650_LED_MAX_BRIGHTNESS MAX77650_LED_BR_MASK
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/* Enable EN_LED_MSTR. */
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#define MAX77650_LED_TOP_DEFAULT BIT(0)
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#define MAX77650_LED_ENABLE GENMASK(7, 6)
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#define MAX77650_LED_DISABLE 0x00
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#define MAX77650_LED_A_DEFAULT MAX77650_LED_DISABLE
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/* 100% on duty */
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#define MAX77650_LED_B_DEFAULT GENMASK(3, 0)
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struct max77650_led {
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struct led_classdev cdev;
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struct regmap *map;
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unsigned int regA;
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unsigned int regB;
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};
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static struct max77650_led *max77650_to_led(struct led_classdev *cdev)
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{
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return container_of(cdev, struct max77650_led, cdev);
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}
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static int max77650_led_brightness_set(struct led_classdev *cdev,
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enum led_brightness brightness)
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{
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struct max77650_led *led = max77650_to_led(cdev);
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int val, mask;
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mask = MAX77650_LED_BR_MASK | MAX77650_LED_EN_MASK;
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if (brightness == LED_OFF)
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val = MAX77650_LED_DISABLE;
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else
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val = MAX77650_LED_ENABLE | brightness;
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return regmap_update_bits(led->map, led->regA, mask, val);
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}
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static int max77650_led_probe(struct platform_device *pdev)
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{
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struct device_node *of_node, *child;
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struct max77650_led *leds, *led;
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struct device *parent;
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struct device *dev;
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struct regmap *map;
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const char *label;
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int rv, num_leds;
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u32 reg;
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dev = &pdev->dev;
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parent = dev->parent;
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of_node = dev->of_node;
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if (!of_node)
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return -ENODEV;
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leds = devm_kcalloc(dev, sizeof(*leds),
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MAX77650_LED_NUM_LEDS, GFP_KERNEL);
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if (!leds)
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return -ENOMEM;
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map = dev_get_regmap(dev->parent, NULL);
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if (!map)
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return -ENODEV;
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num_leds = of_get_child_count(of_node);
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if (!num_leds || num_leds > MAX77650_LED_NUM_LEDS)
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return -ENODEV;
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for_each_child_of_node(of_node, child) {
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rv = of_property_read_u32(child, "reg", ®);
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if (rv || reg >= MAX77650_LED_NUM_LEDS)
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return -EINVAL;
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led = &leds[reg];
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led->map = map;
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led->regA = MAX77650_LED_A_BASE + reg;
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led->regB = MAX77650_LED_B_BASE + reg;
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led->cdev.brightness_set_blocking = max77650_led_brightness_set;
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led->cdev.max_brightness = MAX77650_LED_MAX_BRIGHTNESS;
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label = of_get_property(child, "label", NULL);
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if (!label) {
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led->cdev.name = "max77650::";
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} else {
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led->cdev.name = devm_kasprintf(dev, GFP_KERNEL,
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"max77650:%s", label);
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if (!led->cdev.name)
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return -ENOMEM;
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}
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of_property_read_string(child, "linux,default-trigger",
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&led->cdev.default_trigger);
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rv = devm_of_led_classdev_register(dev, child, &led->cdev);
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if (rv)
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return rv;
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rv = regmap_write(map, led->regA, MAX77650_LED_A_DEFAULT);
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if (rv)
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return rv;
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rv = regmap_write(map, led->regB, MAX77650_LED_B_DEFAULT);
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if (rv)
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return rv;
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}
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return regmap_write(map,
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MAX77650_REG_CNFG_LED_TOP,
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MAX77650_LED_TOP_DEFAULT);
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}
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static struct platform_driver max77650_led_driver = {
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.driver = {
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.name = "max77650-led",
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},
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.probe = max77650_led_probe,
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};
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module_platform_driver(max77650_led_driver);
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MODULE_DESCRIPTION("MAXIM 77650/77651 LED driver");
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MODULE_AUTHOR("Bartosz Golaszewski <bgolaszewski@baylibre.com>");
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MODULE_LICENSE("GPL v2");
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