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Release 4.10 drivers/leds/leds-pm8058.c

Directory: drivers/leds
/* Copyright (c) 2010, 2011, 2016 The Linux Foundation. All rights reserved.
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 and
 * only version 2 as published by the Free Software Foundation.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 */
#include <linux/leds.h>
#include <linux/module.h>
#include <linux/of.h>
#include <linux/of_device.h>
#include <linux/platform_device.h>
#include <linux/pm.h>
#include <linux/regmap.h>


#define PM8058_LED_TYPE_COMMON	0x00

#define PM8058_LED_TYPE_KEYPAD	0x01

#define PM8058_LED_TYPE_FLASH	0x02


#define PM8058_LED_TYPE_COMMON_MASK	0xf8

#define PM8058_LED_TYPE_KEYPAD_MASK	0xf0

#define PM8058_LED_TYPE_COMMON_SHIFT	3

#define PM8058_LED_TYPE_KEYPAD_SHIFT	4


struct pm8058_led {
	
struct regmap *map;
	
u32 reg;
	
u32 ledtype;
	
struct led_classdev cdev;
};


static void pm8058_led_set(struct led_classdev *cled, enum led_brightness value) { struct pm8058_led *led; int ret = 0; unsigned int mask = 0; unsigned int val = 0; led = container_of(cled, struct pm8058_led, cdev); switch (led->ledtype) { case PM8058_LED_TYPE_COMMON: mask = PM8058_LED_TYPE_COMMON_MASK; val = value << PM8058_LED_TYPE_COMMON_SHIFT; break; case PM8058_LED_TYPE_KEYPAD: case PM8058_LED_TYPE_FLASH: mask = PM8058_LED_TYPE_KEYPAD_MASK; val = value << PM8058_LED_TYPE_KEYPAD_SHIFT; break; default: break; } ret = regmap_update_bits(led->map, led->reg, mask, val); if (ret) pr_err("Failed to set LED brightness\n"); }

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static enum led_brightness pm8058_led_get(struct led_classdev *cled) { struct pm8058_led *led; int ret; unsigned int val; led = container_of(cled, struct pm8058_led, cdev); ret = regmap_read(led->map, led->reg, &val); if (ret) { pr_err("Failed to get LED brightness\n"); return LED_OFF; } switch (led->ledtype) { case PM8058_LED_TYPE_COMMON: val &= PM8058_LED_TYPE_COMMON_MASK; val >>= PM8058_LED_TYPE_COMMON_SHIFT; break; case PM8058_LED_TYPE_KEYPAD: case PM8058_LED_TYPE_FLASH: val &= PM8058_LED_TYPE_KEYPAD_MASK; val >>= PM8058_LED_TYPE_KEYPAD_SHIFT; break; default: val = LED_OFF; break; } return val; }

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static int pm8058_led_probe(struct platform_device *pdev) { struct pm8058_led *led; struct device_node *np = pdev->dev.of_node; int ret; struct regmap *map; const char *state; enum led_brightness maxbright; led = devm_kzalloc(&pdev->dev, sizeof(*led), GFP_KERNEL); if (!led) return -ENOMEM; led->ledtype = (u32)of_device_get_match_data(&pdev->dev); map = dev_get_regmap(pdev->dev.parent, NULL); if (!map) { dev_err(&pdev->dev, "Parent regmap unavailable.\n"); return -ENXIO; } led->map = map; ret = of_property_read_u32(np, "reg", &led->reg); if (ret) { dev_err(&pdev->dev, "no register offset specified\n"); return -EINVAL; } /* Use label else node name */ led->cdev.name = of_get_property(np, "label", NULL) ? : np->name; led->cdev.default_trigger = of_get_property(np, "linux,default-trigger", NULL); led->cdev.brightness_set = pm8058_led_set; led->cdev.brightness_get = pm8058_led_get; if (led->ledtype == PM8058_LED_TYPE_COMMON) maxbright = 31; /* 5 bits */ else maxbright = 15; /* 4 bits */ led->cdev.max_brightness = maxbright; state = of_get_property(np, "default-state", NULL); if (state) { if (!strcmp(state, "keep")) { led->cdev.brightness = pm8058_led_get(&led->cdev); } else if (!strcmp(state, "on")) { led->cdev.brightness = maxbright; pm8058_led_set(&led->cdev, maxbright); } else { led->cdev.brightness = LED_OFF; pm8058_led_set(&led->cdev, LED_OFF); } } if (led->ledtype == PM8058_LED_TYPE_KEYPAD || led->ledtype == PM8058_LED_TYPE_FLASH) led->cdev.flags = LED_CORE_SUSPENDRESUME; ret = devm_led_classdev_register(&pdev->dev, &led->cdev); if (ret) { dev_err(&pdev->dev, "unable to register led \"%s\"\n", led->cdev.name); return ret; } return 0; }

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static const struct of_device_id pm8058_leds_id_table[] = { { .compatible = "qcom,pm8058-led", .data = (void *)PM8058_LED_TYPE_COMMON }, { .compatible = "qcom,pm8058-keypad-led", .data = (void *)PM8058_LED_TYPE_KEYPAD }, { .compatible = "qcom,pm8058-flash-led", .data = (void *)PM8058_LED_TYPE_FLASH }, { }, }; MODULE_DEVICE_TABLE(of, pm8058_leds_id_table); static struct platform_driver pm8058_led_driver = { .probe = pm8058_led_probe, .driver = { .name = "pm8058-leds", .of_match_table = pm8058_leds_id_table, }, }; module_platform_driver(pm8058_led_driver); MODULE_DESCRIPTION("PM8058 LEDs driver"); MODULE_LICENSE("GPL v2"); MODULE_ALIAS("platform:pm8058-leds");

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Directory: drivers/leds
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