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Release 4.14 drivers/leds/leds-lm3533.c

Directory: drivers/leds
/*
 * leds-lm3533.c -- LM3533 LED driver
 *
 * Copyright (C) 2011-2012 Texas Instruments
 *
 * Author: Johan Hovold <jhovold@gmail.com>
 *
 * 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.
 */

#include <linux/module.h>
#include <linux/leds.h>
#include <linux/mfd/core.h>
#include <linux/mutex.h>
#include <linux/platform_device.h>
#include <linux/slab.h>

#include <linux/mfd/lm3533.h>



#define LM3533_LVCTRLBANK_MIN		2

#define LM3533_LVCTRLBANK_MAX		5

#define LM3533_LVCTRLBANK_COUNT		4

#define LM3533_RISEFALLTIME_MAX		7

#define LM3533_ALS_CHANNEL_LV_MIN	1

#define LM3533_ALS_CHANNEL_LV_MAX	2


#define LM3533_REG_CTRLBANK_BCONF_BASE		0x1b

#define LM3533_REG_PATTERN_ENABLE		0x28

#define LM3533_REG_PATTERN_LOW_TIME_BASE	0x71

#define LM3533_REG_PATTERN_HIGH_TIME_BASE	0x72

#define LM3533_REG_PATTERN_RISETIME_BASE	0x74

#define LM3533_REG_PATTERN_FALLTIME_BASE	0x75


#define LM3533_REG_PATTERN_STEP			0x10


#define LM3533_REG_CTRLBANK_BCONF_MAPPING_MASK		0x04

#define LM3533_REG_CTRLBANK_BCONF_ALS_EN_MASK		0x02

#define LM3533_REG_CTRLBANK_BCONF_ALS_CHANNEL_MASK	0x01


#define LM3533_LED_FLAG_PATTERN_ENABLE		1



struct lm3533_led {
	
struct lm3533 *lm3533;
	
struct lm3533_ctrlbank cb;
	
struct led_classdev cdev;
	
int id;

	
struct mutex mutex;
	
unsigned long flags;
};



static inline struct lm3533_led *to_lm3533_led(struct led_classdev *cdev) { return container_of(cdev, struct lm3533_led, cdev); }

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static inline int lm3533_led_get_ctrlbank_id(struct lm3533_led *led) { return led->id + 2; }

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static inline u8 lm3533_led_get_lv_reg(struct lm3533_led *led, u8 base) { return base + led->id; }

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static inline u8 lm3533_led_get_pattern(struct lm3533_led *led) { return led->id; }

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static inline u8 lm3533_led_get_pattern_reg(struct lm3533_led *led, u8 base) { return base + lm3533_led_get_pattern(led) * LM3533_REG_PATTERN_STEP; }

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static int lm3533_led_pattern_enable(struct lm3533_led *led, int enable) { u8 mask; u8 val; int pattern; int state; int ret = 0; dev_dbg(led->cdev.dev, "%s - %d\n", __func__, enable); mutex_lock(&led->mutex); state = test_bit(LM3533_LED_FLAG_PATTERN_ENABLE, &led->flags); if ((enable && state) || (!enable && !state)) goto out; pattern = lm3533_led_get_pattern(led); mask = 1 << (2 * pattern); if (enable) val = mask; else val = 0; ret = lm3533_update(led->lm3533, LM3533_REG_PATTERN_ENABLE, val, mask); if (ret) { dev_err(led->cdev.dev, "failed to enable pattern %d (%d)\n", pattern, enable); goto out; } __change_bit(LM3533_LED_FLAG_PATTERN_ENABLE, &led->flags); out: mutex_unlock(&led->mutex); return ret; }

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static int lm3533_led_set(struct led_classdev *cdev, enum led_brightness value) { struct lm3533_led *led = to_lm3533_led(cdev); dev_dbg(led->cdev.dev, "%s - %d\n", __func__, value); if (value == 0) lm3533_led_pattern_enable(led, 0); /* disable blink */ return lm3533_ctrlbank_set_brightness(&led->cb, value); }

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static enum led_brightness lm3533_led_get(struct led_classdev *cdev) { struct lm3533_led *led = to_lm3533_led(cdev); u8 val; int ret; ret = lm3533_ctrlbank_get_brightness(&led->cb, &val); if (ret) return ret; dev_dbg(led->cdev.dev, "%s - %u\n", __func__, val); return val; }

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/* Pattern generator defines (delays in us). */ #define LM3533_LED_DELAY1_VMIN 0x00 #define LM3533_LED_DELAY2_VMIN 0x3d #define LM3533_LED_DELAY3_VMIN 0x80 #define LM3533_LED_DELAY1_VMAX (LM3533_LED_DELAY2_VMIN - 1) #define LM3533_LED_DELAY2_VMAX (LM3533_LED_DELAY3_VMIN - 1) #define LM3533_LED_DELAY3_VMAX 0xff #define LM3533_LED_DELAY1_TMIN 16384U #define LM3533_LED_DELAY2_TMIN 1130496U #define LM3533_LED_DELAY3_TMIN 10305536U #define LM3533_LED_DELAY1_TMAX 999424U #define LM3533_LED_DELAY2_TMAX 9781248U #define LM3533_LED_DELAY3_TMAX 76890112U /* t_step = (t_max - t_min) / (v_max - v_min) */ #define LM3533_LED_DELAY1_TSTEP 16384 #define LM3533_LED_DELAY2_TSTEP 131072 #define LM3533_LED_DELAY3_TSTEP 524288 /* Delay limits for hardware accelerated blinking (in ms). */ #define LM3533_LED_DELAY_ON_MAX \ ((LM3533_LED_DELAY2_TMAX + LM3533_LED_DELAY2_TSTEP / 2) / 1000) #define LM3533_LED_DELAY_OFF_MAX \ ((LM3533_LED_DELAY3_TMAX + LM3533_LED_DELAY3_TSTEP / 2) / 1000) /* * Returns linear map of *t from [t_min,t_max] to [v_min,v_max] with a step * size of t_step, where * * t_step = (t_max - t_min) / (v_max - v_min) * * and updates *t to reflect the mapped value. */
static u8 time_to_val(unsigned *t, unsigned t_min, unsigned t_step, u8 v_min, u8 v_max) { unsigned val; val = (*t + t_step / 2 - t_min) / t_step + v_min; *t = t_step * (val - v_min) + t_min; return (u8)val; }

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/* * Returns time code corresponding to *delay (in ms) and updates *delay to * reflect actual hardware delay. * * Hardware supports 256 discrete delay times, divided into three groups with * the following ranges and step-sizes: * * [ 16, 999] [0x00, 0x3e] step 16 ms * [ 1130, 9781] [0x3d, 0x7f] step 131 ms * [10306, 76890] [0x80, 0xff] step 524 ms * * Note that delay group 3 is only available for delay_off. */
static u8 lm3533_led_get_hw_delay(unsigned *delay) { unsigned t; u8 val; t = *delay * 1000; if (t >= (LM3533_LED_DELAY2_TMAX + LM3533_LED_DELAY3_TMIN) / 2) { t = clamp(t, LM3533_LED_DELAY3_TMIN, LM3533_LED_DELAY3_TMAX); val = time_to_val(&t, LM3533_LED_DELAY3_TMIN, LM3533_LED_DELAY3_TSTEP, LM3533_LED_DELAY3_VMIN, LM3533_LED_DELAY3_VMAX); } else if (t >= (LM3533_LED_DELAY1_TMAX + LM3533_LED_DELAY2_TMIN) / 2) { t = clamp(t, LM3533_LED_DELAY2_TMIN, LM3533_LED_DELAY2_TMAX); val = time_to_val(&t, LM3533_LED_DELAY2_TMIN, LM3533_LED_DELAY2_TSTEP, LM3533_LED_DELAY2_VMIN, LM3533_LED_DELAY2_VMAX); } else { t = clamp(t, LM3533_LED_DELAY1_TMIN, LM3533_LED_DELAY1_TMAX); val = time_to_val(&t, LM3533_LED_DELAY1_TMIN, LM3533_LED_DELAY1_TSTEP, LM3533_LED_DELAY1_VMIN, LM3533_LED_DELAY1_VMAX); } *delay = (t + 500) / 1000; return val; }

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/* * Set delay register base to *delay (in ms) and update *delay to reflect * actual hardware delay used. */
static u8 lm3533_led_delay_set(struct lm3533_led *led, u8 base, unsigned long *delay) { unsigned t; u8 val; u8 reg; int ret; t = (unsigned)*delay; /* Delay group 3 is only available for low time (delay off). */ if (base != LM3533_REG_PATTERN_LOW_TIME_BASE) t = min(t, LM3533_LED_DELAY2_TMAX / 1000); val = lm3533_led_get_hw_delay(&t); dev_dbg(led->cdev.dev, "%s - %lu: %u (0x%02x)\n", __func__, *delay, t, val); reg = lm3533_led_get_pattern_reg(led, base); ret = lm3533_write(led->lm3533, reg, val); if (ret) dev_err(led->cdev.dev, "failed to set delay (%02x)\n", reg); *delay = t; return ret; }

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static int lm3533_led_delay_on_set(struct lm3533_led *led, unsigned long *t) { return lm3533_led_delay_set(led, LM3533_REG_PATTERN_HIGH_TIME_BASE, t); }

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static int lm3533_led_delay_off_set(struct lm3533_led *led, unsigned long *t) { return lm3533_led_delay_set(led, LM3533_REG_PATTERN_LOW_TIME_BASE, t); }

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static int lm3533_led_blink_set(struct led_classdev *cdev, unsigned long *delay_on, unsigned long *delay_off) { struct lm3533_led *led = to_lm3533_led(cdev); int ret; dev_dbg(led->cdev.dev, "%s - on = %lu, off = %lu\n", __func__, *delay_on, *delay_off); if (*delay_on > LM3533_LED_DELAY_ON_MAX || *delay_off > LM3533_LED_DELAY_OFF_MAX) return -EINVAL; if (*delay_on == 0 && *delay_off == 0) { *delay_on = 500; *delay_off = 500; } ret = lm3533_led_delay_on_set(led, delay_on); if (ret) return ret; ret = lm3533_led_delay_off_set(led, delay_off); if (ret) return ret; return lm3533_led_pattern_enable(led, 1); }

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static ssize_t show_id(struct device *dev, struct device_attribute *attr, char *buf) { struct led_classdev *led_cdev = dev_get_drvdata(dev); struct lm3533_led *led = to_lm3533_led(led_cdev); return scnprintf(buf, PAGE_SIZE, "%d\n", led->id); }

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/* * Pattern generator rise/fall times: * * 0 - 2048 us (default) * 1 - 262 ms * 2 - 524 ms * 3 - 1.049 s * 4 - 2.097 s * 5 - 4.194 s * 6 - 8.389 s * 7 - 16.78 s */
static ssize_t show_risefalltime(struct device *dev, struct device_attribute *attr, char *buf, u8 base) { struct led_classdev *led_cdev = dev_get_drvdata(dev); struct lm3533_led *led = to_lm3533_led(led_cdev); ssize_t ret; u8 reg; u8 val; reg = lm3533_led_get_pattern_reg(led, base); ret = lm3533_read(led->lm3533, reg, &val); if (ret) return ret; return scnprintf(buf, PAGE_SIZE, "%x\n", val); }

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static ssize_t show_risetime(struct device *dev, struct device_attribute *attr, char *buf) { return show_risefalltime(dev, attr, buf, LM3533_REG_PATTERN_RISETIME_BASE); }

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static ssize_t show_falltime(struct device *dev, struct device_attribute *attr, char *buf) { return show_risefalltime(dev, attr, buf, LM3533_REG_PATTERN_FALLTIME_BASE); }

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static ssize_t store_risefalltime(struct device *dev, struct device_attribute *attr, const char *buf, size_t len, u8 base) { struct led_classdev *led_cdev = dev_get_drvdata(dev); struct lm3533_led *led = to_lm3533_led(led_cdev); u8 val; u8 reg; int ret; if (kstrtou8(buf, 0, &val) || val > LM3533_RISEFALLTIME_MAX) return -EINVAL; reg = lm3533_led_get_pattern_reg(led, base); ret = lm3533_write(led->lm3533, reg, val); if (ret) return ret; return len; }

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static ssize_t store_risetime(struct device *dev, struct device_attribute *attr, const char *buf, size_t len) { return store_risefalltime(dev, attr, buf, len, LM3533_REG_PATTERN_RISETIME_BASE); }

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static ssize_t store_falltime(struct device *dev, struct device_attribute *attr, const char *buf, size_t len) { return store_risefalltime(dev, attr, buf, len, LM3533_REG_PATTERN_FALLTIME_BASE); }

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static ssize_t show_als_channel(struct device *dev, struct device_attribute *attr, char *buf) { struct led_classdev *led_cdev = dev_get_drvdata(dev); struct lm3533_led *led = to_lm3533_led(led_cdev); unsigned channel; u8 reg; u8 val; int ret; reg = lm3533_led_get_lv_reg(led, LM3533_REG_CTRLBANK_BCONF_BASE); ret = lm3533_read(led->lm3533, reg, &val); if (ret) return ret; channel = (val & LM3533_REG_CTRLBANK_BCONF_ALS_CHANNEL_MASK) + 1; return scnprintf(buf, PAGE_SIZE, "%u\n", channel); }

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static ssize_t store_als_channel(struct device *dev, struct device_attribute *attr, const char *buf, size_t len) { struct led_classdev *led_cdev = dev_get_drvdata(dev); struct lm3533_led *led = to_lm3533_led(led_cdev); unsigned channel; u8 reg; u8 val; u8 mask; int ret; if (kstrtouint(buf, 0, &channel)) return -EINVAL; if (channel < LM3533_ALS_CHANNEL_LV_MIN || channel > LM3533_ALS_CHANNEL_LV_MAX) return -EINVAL; reg = lm3533_led_get_lv_reg(led, LM3533_REG_CTRLBANK_BCONF_BASE); mask = LM3533_REG_CTRLBANK_BCONF_ALS_CHANNEL_MASK; val = channel - 1; ret = lm3533_update(led->lm3533, reg, val, mask); if (ret) return ret; return len; }

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static ssize_t show_als_en(struct device *dev, struct device_attribute *attr, char *buf) { struct led_classdev *led_cdev = dev_get_drvdata(dev); struct lm3533_led *led = to_lm3533_led(led_cdev); bool enable; u8 reg; u8 val; int ret; reg = lm3533_led_get_lv_reg(led, LM3533_REG_CTRLBANK_BCONF_BASE); ret = lm3533_read(led->lm3533, reg, &val); if (ret) return ret; enable = val & LM3533_REG_CTRLBANK_BCONF_ALS_EN_MASK; return scnprintf(buf, PAGE_SIZE, "%d\n", enable); }

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static ssize_t store_als_en(struct device *dev, struct device_attribute *attr, const char *buf, size_t len) { struct led_classdev *led_cdev = dev_get_drvdata(dev); struct lm3533_led *led = to_lm3533_led(led_cdev); unsigned enable; u8 reg; u8 mask; u8 val; int ret; if (kstrtouint(buf, 0, &enable)) return -EINVAL; reg = lm3533_led_get_lv_reg(led, LM3533_REG_CTRLBANK_BCONF_BASE); mask = LM3533_REG_CTRLBANK_BCONF_ALS_EN_MASK; if (enable) val = mask; else val = 0; ret = lm3533_update(led->lm3533, reg, val, mask); if (ret) return ret; return len; }

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static ssize_t show_linear(struct device *dev, struct device_attribute *attr, char *buf) { struct led_classdev *led_cdev = dev_get_drvdata(dev); struct lm3533_led *led = to_lm3533_led(led_cdev); u8 reg; u8 val; int linear; int ret; reg = lm3533_led_get_lv_reg(led, LM3533_REG_CTRLBANK_BCONF_BASE); ret = lm3533_read(led->lm3533, reg, &val); if (ret) return ret; if (val & LM3533_REG_CTRLBANK_BCONF_MAPPING_MASK) linear = 1; else linear = 0; return scnprintf(buf, PAGE_SIZE, "%x\n", linear); }

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static ssize_t store_linear(struct device *dev, struct device_attribute *attr, const char *buf, size_t len) { struct led_classdev *led_cdev = dev_get_drvdata(dev); struct lm3533_led *led = to_lm3533_led(led_cdev); unsigned long linear; u8 reg; u8 mask; u8 val; int ret; if (kstrtoul(buf, 0, &linear)) return -EINVAL; reg = lm3533_led_get_lv_reg(led, LM3533_REG_CTRLBANK_BCONF_BASE); mask = LM3533_REG_CTRLBANK_BCONF_MAPPING_MASK; if (linear) val = mask; else val = 0; ret = lm3533_update(led->lm3533, reg, val, mask); if (ret) return ret; return len; }

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static ssize_t show_pwm(struct device *dev, struct device_attribute *attr, char *buf) { struct led_classdev *led_cdev = dev_get_drvdata(dev); struct lm3533_led *led = to_lm3533_led(led_cdev); u8 val; int ret; ret = lm3533_ctrlbank_get_pwm(&led->cb, &val); if (ret) return ret; return scnprintf(buf, PAGE_SIZE, "%u\n", val); }

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static ssize_t store_pwm(struct device *dev, struct device_attribute *attr, const char *buf, size_t len) { struct led_classdev *led_cdev = dev_get_drvdata(dev); struct lm3533_led *led = to_lm3533_led(led_cdev); u8 val; int ret; if (kstrtou8(buf, 0, &val)) return -EINVAL; ret = lm3533_ctrlbank_set_pwm(&led->cb, val); if (ret) return ret; return len; }

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static LM3533_ATTR_RW(als_channel); static LM3533_ATTR_RW(als_en); static LM3533_ATTR_RW(falltime); static LM3533_ATTR_RO(id); static LM3533_ATTR_RW(linear); static LM3533_ATTR_RW(pwm); static LM3533_ATTR_RW(risetime); static struct attribute *lm3533_led_attributes[] = { &dev_attr_als_channel.attr, &dev_attr_als_en.attr, &dev_attr_falltime.attr, &dev_attr_id.attr, &dev_attr_linear.attr, &dev_attr_pwm.attr, &dev_attr_risetime.attr, NULL, };
static umode_t lm3533_led_attr_is_visible(struct kobject *kobj, struct attribute *attr, int n) { struct device *dev = container_of(kobj, struct device, kobj); struct led_classdev *led_cdev = dev_get_drvdata(dev); struct lm3533_led *led = to_lm3533_led(led_cdev); umode_t mode = attr->mode; if (attr == &dev_attr_als_channel.attr || attr == &dev_attr_als_en.attr) { if (!led->lm3533->have_als) mode = 0; } return mode; }

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; static const struct attribute_group lm3533_led_attribute_group = { .is_visible = lm3533_led_attr_is_visible, .attrs = lm3533_led_attributes }; static const struct attribute_group *lm3533_led_attribute_groups[] = { &lm3533_led_attribute_group, NULL };
static int lm3533_led_setup(struct lm3533_led *led, struct lm3533_led_platform_data *pdata) { int ret; ret = lm3533_ctrlbank_set_max_current(&led->cb, pdata->max_current); if (ret) return ret; return lm3533_ctrlbank_set_pwm(&led->cb, pdata->pwm); }

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static int lm3533_led_probe(struct platform_device *pdev) { struct lm3533 *lm3533; struct lm3533_led_platform_data *pdata; struct lm3533_led *led; int ret; dev_dbg(&pdev->dev, "%s\n", __func__); lm3533 = dev_get_drvdata(pdev->dev.parent); if (!lm3533) return -EINVAL; pdata = dev_get_platdata(&pdev->dev); if (!pdata) { dev_err(&pdev->dev, "no platform data\n"); return -EINVAL; } if (pdev->id < 0 || pdev->id >= LM3533_LVCTRLBANK_COUNT) { dev_err(&pdev->dev, "illegal LED id %d\n", pdev->id); return -EINVAL; } led = devm_kzalloc(&pdev->dev, sizeof(*led), GFP_KERNEL); if (!led) return -ENOMEM; led->lm3533 = lm3533; led->cdev.name = pdata->name; led->cdev.default_trigger = pdata->default_trigger; led->cdev.brightness_set_blocking = lm3533_led_set; led->cdev.brightness_get = lm3533_led_get; led->cdev.blink_set = lm3533_led_blink_set; led->cdev.brightness = LED_OFF; led->cdev.groups = lm3533_led_attribute_groups, led->id = pdev->id; mutex_init(&led->mutex); /* The class framework makes a callback to get brightness during * registration so use parent device (for error reporting) until * registered. */ led->cb.lm3533 = lm3533; led->cb.id = lm3533_led_get_ctrlbank_id(led); led->cb.dev = lm3533->dev; platform_set_drvdata(pdev, led); ret = devm_led_classdev_register(pdev->dev.parent, &led->cdev); if (ret) { dev_err(&pdev->dev, "failed to register LED %d\n", pdev->id); return ret; } led->cb.dev = led->cdev.dev; ret = lm3533_led_setup(led, pdata); if (ret) return ret; ret = lm3533_ctrlbank_enable(&led->cb); if (ret) return ret; return 0; }

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Jingoo Han41.11%120.00%
Andrew Lunn10.28%120.00%
Total359100.00%5100.00%


static int lm3533_led_remove(struct platform_device *pdev) { struct lm3533_led *led = platform_get_drvdata(pdev); dev_dbg(&pdev->dev, "%s\n", __func__); lm3533_ctrlbank_disable(&led->cb); return 0; }

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Johan Hovold44100.00%1100.00%
Total44100.00%1100.00%


static void lm3533_led_shutdown(struct platform_device *pdev) { struct lm3533_led *led = platform_get_drvdata(pdev); dev_dbg(&pdev->dev, "%s\n", __func__); lm3533_ctrlbank_disable(&led->cb); lm3533_led_set(&led->cdev, LED_OFF); /* disable blink */ }

Contributors

PersonTokensPropCommitsCommitProp
Johan Hovold52100.00%1100.00%
Total52100.00%1100.00%

static struct platform_driver lm3533_led_driver = { .driver = { .name = "lm3533-leds", }, .probe = lm3533_led_probe, .remove = lm3533_led_remove, .shutdown = lm3533_led_shutdown, }; module_platform_driver(lm3533_led_driver); MODULE_AUTHOR("Johan Hovold <jhovold@gmail.com>"); MODULE_DESCRIPTION("LM3533 LED driver"); MODULE_LICENSE("GPL"); MODULE_ALIAS("platform:lm3533-leds");

Overall Contributors

PersonTokensPropCommitsCommitProp
Johan Hovold315699.15%233.33%
Andrew Lunn160.50%116.67%
Amitoj Kaur Chawla70.22%233.33%
Jingoo Han40.13%116.67%
Total3183100.00%6100.00%
Directory: drivers/leds
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