mirror of
https://github.com/AuxXxilium/linux_dsm_epyc7002.git
synced 2024-12-22 11:47:53 +07:00
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>
148 lines
3.5 KiB
C
148 lines
3.5 KiB
C
// 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 device_node *of_node, *child;
|
|
struct max77650_led *leds, *led;
|
|
struct device *parent;
|
|
struct device *dev;
|
|
struct regmap *map;
|
|
const char *label;
|
|
int rv, num_leds;
|
|
u32 reg;
|
|
|
|
dev = &pdev->dev;
|
|
parent = dev->parent;
|
|
of_node = dev->of_node;
|
|
|
|
if (!of_node)
|
|
return -ENODEV;
|
|
|
|
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 = of_get_child_count(of_node);
|
|
if (!num_leds || num_leds > MAX77650_LED_NUM_LEDS)
|
|
return -ENODEV;
|
|
|
|
for_each_child_of_node(of_node, child) {
|
|
rv = of_property_read_u32(child, "reg", ®);
|
|
if (rv || reg >= MAX77650_LED_NUM_LEDS)
|
|
return -EINVAL;
|
|
|
|
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;
|
|
|
|
label = of_get_property(child, "label", NULL);
|
|
if (!label) {
|
|
led->cdev.name = "max77650::";
|
|
} else {
|
|
led->cdev.name = devm_kasprintf(dev, GFP_KERNEL,
|
|
"max77650:%s", label);
|
|
if (!led->cdev.name)
|
|
return -ENOMEM;
|
|
}
|
|
|
|
of_property_read_string(child, "linux,default-trigger",
|
|
&led->cdev.default_trigger);
|
|
|
|
rv = devm_of_led_classdev_register(dev, child, &led->cdev);
|
|
if (rv)
|
|
return rv;
|
|
|
|
rv = regmap_write(map, led->regA, MAX77650_LED_A_DEFAULT);
|
|
if (rv)
|
|
return rv;
|
|
|
|
rv = regmap_write(map, led->regB, MAX77650_LED_B_DEFAULT);
|
|
if (rv)
|
|
return rv;
|
|
}
|
|
|
|
return regmap_write(map,
|
|
MAX77650_REG_CNFG_LED_TOP,
|
|
MAX77650_LED_TOP_DEFAULT);
|
|
}
|
|
|
|
static struct platform_driver max77650_led_driver = {
|
|
.driver = {
|
|
.name = "max77650-led",
|
|
},
|
|
.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");
|