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Release 4.14 drivers/leds/leds-syscon.c

Directory: drivers/leds
/*
 * Generic Syscon LEDs Driver
 *
 * Copyright (c) 2014, Linaro Limited
 * Author: Linus Walleij <linus.walleij@linaro.org>
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License as
 * published by the Free Software Foundation; either version 2 of
 * the License, or (at your option) any later version.
 *
 * 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.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
 * MA 02111-1307 USA
 */
#include <linux/io.h>
#include <linux/init.h>
#include <linux/of_device.h>
#include <linux/of_address.h>
#include <linux/platform_device.h>
#include <linux/stat.h>
#include <linux/slab.h>
#include <linux/mfd/syscon.h>
#include <linux/regmap.h>
#include <linux/leds.h>

/**
 * struct syscon_led - state container for syscon based LEDs
 * @cdev: LED class device for this LED
 * @map: regmap to access the syscon device backing this LED
 * @offset: the offset into the syscon regmap for the LED register
 * @mask: the bit in the register corresponding to the LED
 * @state: current state of the LED
 */

struct syscon_led {
	
struct led_classdev cdev;
	
struct regmap *map;
	
u32 offset;
	
u32 mask;
	
bool state;
};


static void syscon_led_set(struct led_classdev *led_cdev, enum led_brightness value) { struct syscon_led *sled = container_of(led_cdev, struct syscon_led, cdev); u32 val; int ret; if (value == LED_OFF) { val = 0; sled->state = false; } else { val = sled->mask; sled->state = true; } ret = regmap_update_bits(sled->map, sled->offset, sled->mask, val); if (ret < 0) dev_err(sled->cdev.dev, "error updating LED status\n"); }

Contributors

PersonTokensPropCommitsCommitProp
Linus Walleij105100.00%1100.00%
Total105100.00%1100.00%


static int syscon_led_probe(struct platform_device *pdev) { struct device *dev = &pdev->dev; struct device_node *np = dev->of_node; struct device *parent; struct regmap *map; struct syscon_led *sled; const char *state; int ret; parent = dev->parent; if (!parent) { dev_err(dev, "no parent for syscon LED\n"); return -ENODEV; } map = syscon_node_to_regmap(parent->of_node); if (IS_ERR(map)) { dev_err(dev, "no regmap for syscon LED parent\n"); return PTR_ERR(map); } sled = devm_kzalloc(dev, sizeof(*sled), GFP_KERNEL); if (!sled) return -ENOMEM; sled->map = map; if (of_property_read_u32(np, "offset", &sled->offset)) return -EINVAL; if (of_property_read_u32(np, "mask", &sled->mask)) return -EINVAL; sled->cdev.name = of_get_property(np, "label", NULL) ? : np->name; sled->cdev.default_trigger = of_get_property(np, "linux,default-trigger", NULL); state = of_get_property(np, "default-state", NULL); if (state) { if (!strcmp(state, "keep")) { u32 val; ret = regmap_read(map, sled->offset, &val); if (ret < 0) return ret; sled->state = !!(val & sled->mask); } else if (!strcmp(state, "on")) { sled->state = true; ret = regmap_update_bits(map, sled->offset, sled->mask, sled->mask); if (ret < 0) return ret; } else { sled->state = false; ret = regmap_update_bits(map, sled->offset, sled->mask, 0); if (ret < 0) return ret; } } sled->cdev.brightness_set = syscon_led_set; ret = led_classdev_register(dev, &sled->cdev); if (ret < 0) return ret; platform_set_drvdata(pdev, sled); dev_info(dev, "registered LED %s\n", sled->cdev.name); return 0; }

Contributors

PersonTokensPropCommitsCommitProp
Linus Walleij40598.30%375.00%
Björn Andersson71.70%125.00%
Total412100.00%4100.00%

static const struct of_device_id of_syscon_leds_match[] = { { .compatible = "register-bit-led", }, {}, }; static struct platform_driver syscon_led_driver = { .probe = syscon_led_probe, .driver = { .name = "leds-syscon", .of_match_table = of_syscon_leds_match, .suppress_bind_attrs = true, }, }; builtin_platform_driver(syscon_led_driver);

Overall Contributors

PersonTokensPropCommitsCommitProp
Linus Walleij61397.77%466.67%
Björn Andersson71.12%116.67%
Paul Gortmaker71.12%116.67%
Total627100.00%6100.00%
Directory: drivers/leds
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