cregit-Linux how code gets into the kernel

Release 4.10 drivers/leds/led-class-flash.c

Directory: drivers/leds
/*
 * LED Flash class interface
 *
 * Copyright (C) 2015 Samsung Electronics Co., Ltd.
 * Author: Jacek Anaszewski <j.anaszewski@samsung.com>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 */

#include <linux/device.h>
#include <linux/init.h>
#include <linux/led-class-flash.h>
#include <linux/leds.h>
#include <linux/module.h>
#include <linux/slab.h>
#include "leds.h"


#define has_flash_op(fled_cdev, op)				\
	(fled_cdev && fled_cdev->ops->op)


#define call_flash_op(fled_cdev, op, args...)		\
	((has_flash_op(fled_cdev, op)) ?                        \
                        (fled_cdev->ops->op(fled_cdev, args)) : \
                        -EINVAL)


static const char * const led_flash_fault_names[] = {
	"led-over-voltage",
	"flash-timeout-exceeded",
	"controller-over-temperature",
	"controller-short-circuit",
	"led-power-supply-over-current",
	"indicator-led-fault",
	"led-under-voltage",
	"controller-under-voltage",
	"led-over-temperature",
};


static ssize_t flash_brightness_store(struct device *dev, struct device_attribute *attr, const char *buf, size_t size) { struct led_classdev *led_cdev = dev_get_drvdata(dev); struct led_classdev_flash *fled_cdev = lcdev_to_flcdev(led_cdev); unsigned long state; ssize_t ret; mutex_lock(&led_cdev->led_access); if (led_sysfs_is_disabled(led_cdev)) { ret = -EBUSY; goto unlock; } ret = kstrtoul(buf, 10, &state); if (ret) goto unlock; ret = led_set_flash_brightness(fled_cdev, state); if (ret < 0) goto unlock; ret = size; unlock: mutex_unlock(&led_cdev->led_access); return ret; }

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static ssize_t flash_brightness_show(struct device *dev, struct device_attribute *attr, char *buf) { struct led_classdev *led_cdev = dev_get_drvdata(dev); struct led_classdev_flash *fled_cdev = lcdev_to_flcdev(led_cdev); /* no lock needed for this */ led_update_flash_brightness(fled_cdev); return sprintf(buf, "%u\n", fled_cdev->brightness.val); }

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static DEVICE_ATTR_RW(flash_brightness);
static ssize_t max_flash_brightness_show(struct device *dev, struct device_attribute *attr, char *buf) { struct led_classdev *led_cdev = dev_get_drvdata(dev); struct led_classdev_flash *fled_cdev = lcdev_to_flcdev(led_cdev); return sprintf(buf, "%u\n", fled_cdev->brightness.max); }

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static DEVICE_ATTR_RO(max_flash_brightness);
static ssize_t flash_strobe_store(struct device *dev, struct device_attribute *attr, const char *buf, size_t size) { struct led_classdev *led_cdev = dev_get_drvdata(dev); struct led_classdev_flash *fled_cdev = lcdev_to_flcdev(led_cdev); unsigned long state; ssize_t ret = -EINVAL; mutex_lock(&led_cdev->led_access); if (led_sysfs_is_disabled(led_cdev)) { ret = -EBUSY; goto unlock; } ret = kstrtoul(buf, 10, &state); if (ret) goto unlock; if (state > 1) { ret = -EINVAL; goto unlock; } ret = led_set_flash_strobe(fled_cdev, state); if (ret < 0) goto unlock; ret = size; unlock: mutex_unlock(&led_cdev->led_access); return ret; }

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static ssize_t flash_strobe_show(struct device *dev, struct device_attribute *attr, char *buf) { struct led_classdev *led_cdev = dev_get_drvdata(dev); struct led_classdev_flash *fled_cdev = lcdev_to_flcdev(led_cdev); bool state; int ret; /* no lock needed for this */ ret = led_get_flash_strobe(fled_cdev, &state); if (ret < 0) return ret; return sprintf(buf, "%u\n", state); }

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static DEVICE_ATTR_RW(flash_strobe);
static ssize_t flash_timeout_store(struct device *dev, struct device_attribute *attr, const char *buf, size_t size) { struct led_classdev *led_cdev = dev_get_drvdata(dev); struct led_classdev_flash *fled_cdev = lcdev_to_flcdev(led_cdev); unsigned long flash_timeout; ssize_t ret; mutex_lock(&led_cdev->led_access); if (led_sysfs_is_disabled(led_cdev)) { ret = -EBUSY; goto unlock; } ret = kstrtoul(buf, 10, &flash_timeout); if (ret) goto unlock; ret = led_set_flash_timeout(fled_cdev, flash_timeout); if (ret < 0) goto unlock; ret = size; unlock: mutex_unlock(&led_cdev->led_access); return ret; }

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static ssize_t flash_timeout_show(struct device *dev, struct device_attribute *attr, char *buf) { struct led_classdev *led_cdev = dev_get_drvdata(dev); struct led_classdev_flash *fled_cdev = lcdev_to_flcdev(led_cdev); return sprintf(buf, "%u\n", fled_cdev->timeout.val); }

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static DEVICE_ATTR_RW(flash_timeout);
static ssize_t max_flash_timeout_show(struct device *dev, struct device_attribute *attr, char *buf) { struct led_classdev *led_cdev = dev_get_drvdata(dev); struct led_classdev_flash *fled_cdev = lcdev_to_flcdev(led_cdev); return sprintf(buf, "%u\n", fled_cdev->timeout.max); }

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static DEVICE_ATTR_RO(max_flash_timeout);
static ssize_t flash_fault_show(struct device *dev, struct device_attribute *attr, char *buf) { struct led_classdev *led_cdev = dev_get_drvdata(dev); struct led_classdev_flash *fled_cdev = lcdev_to_flcdev(led_cdev); u32 fault, mask = 0x1; char *pbuf = buf; int i, ret, buf_len; ret = led_get_flash_fault(fled_cdev, &fault); if (ret < 0) return -EINVAL; *buf = '\0'; for (i = 0; i < LED_NUM_FLASH_FAULTS; ++i) { if (fault & mask) { buf_len = sprintf(pbuf, "%s ", led_flash_fault_names[i]); pbuf += buf_len; } mask <<= 1; } return sprintf(buf, "%s\n", buf); }

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static DEVICE_ATTR_RO(flash_fault); static struct attribute *led_flash_strobe_attrs[] = { &dev_attr_flash_strobe.attr, NULL, }; static struct attribute *led_flash_timeout_attrs[] = { &dev_attr_flash_timeout.attr, &dev_attr_max_flash_timeout.attr, NULL, }; static struct attribute *led_flash_brightness_attrs[] = { &dev_attr_flash_brightness.attr, &dev_attr_max_flash_brightness.attr, NULL, }; static struct attribute *led_flash_fault_attrs[] = { &dev_attr_flash_fault.attr, NULL, }; static const struct attribute_group led_flash_strobe_group = { .attrs = led_flash_strobe_attrs, }; static const struct attribute_group led_flash_timeout_group = { .attrs = led_flash_timeout_attrs, }; static const struct attribute_group led_flash_brightness_group = { .attrs = led_flash_brightness_attrs, }; static const struct attribute_group led_flash_fault_group = { .attrs = led_flash_fault_attrs, };
static void led_flash_resume(struct led_classdev *led_cdev) { struct led_classdev_flash *fled_cdev = lcdev_to_flcdev(led_cdev); call_flash_op(fled_cdev, flash_brightness_set, fled_cdev->brightness.val); call_flash_op(fled_cdev, timeout_set, fled_cdev->timeout.val); }

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static void led_flash_init_sysfs_groups(struct led_classdev_flash *fled_cdev) { struct led_classdev *led_cdev = &fled_cdev->led_cdev; const struct led_flash_ops *ops = fled_cdev->ops; const struct attribute_group **flash_groups = fled_cdev->sysfs_groups; int num_sysfs_groups = 0; flash_groups[num_sysfs_groups++] = &led_flash_strobe_group; if (ops->flash_brightness_set) flash_groups[num_sysfs_groups++] = &led_flash_brightness_group; if (ops->timeout_set) flash_groups[num_sysfs_groups++] = &led_flash_timeout_group; if (ops->fault_get) flash_groups[num_sysfs_groups++] = &led_flash_fault_group; led_cdev->groups = flash_groups; }

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int led_classdev_flash_register(struct device *parent, struct led_classdev_flash *fled_cdev) { struct led_classdev *led_cdev; const struct led_flash_ops *ops; int ret; if (!fled_cdev) return -EINVAL; led_cdev = &fled_cdev->led_cdev; if (led_cdev->flags & LED_DEV_CAP_FLASH) { if (!led_cdev->brightness_set_blocking) return -EINVAL; ops = fled_cdev->ops; if (!ops || !ops->strobe_set) return -EINVAL; led_cdev->flash_resume = led_flash_resume; /* Select the sysfs attributes to be created for the device */ led_flash_init_sysfs_groups(fled_cdev); } /* Register led class device */ ret = led_classdev_register(parent, led_cdev); if (ret < 0) return ret; return 0; }

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EXPORT_SYMBOL_GPL(led_classdev_flash_register);
void led_classdev_flash_unregister(struct led_classdev_flash *fled_cdev) { if (!fled_cdev) return; led_classdev_unregister(&fled_cdev->led_cdev); }

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EXPORT_SYMBOL_GPL(led_classdev_flash_unregister);
static void led_clamp_align(struct led_flash_setting *s) { u32 v, offset; v = s->val + s->step / 2; v = clamp(v, s->min, s->max); offset = v - s->min; offset = s->step * (offset / s->step); s->val = s->min + offset; }

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int led_set_flash_timeout(struct led_classdev_flash *fled_cdev, u32 timeout) { struct led_classdev *led_cdev = &fled_cdev->led_cdev; struct led_flash_setting *s = &fled_cdev->timeout; s->val = timeout; led_clamp_align(s); if (!(led_cdev->flags & LED_SUSPENDED)) return call_flash_op(fled_cdev, timeout_set, s->val); return 0; }

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EXPORT_SYMBOL_GPL(led_set_flash_timeout);
int led_get_flash_fault(struct led_classdev_flash *fled_cdev, u32 *fault) { return call_flash_op(fled_cdev, fault_get, fault); }

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EXPORT_SYMBOL_GPL(led_get_flash_fault);
int led_set_flash_brightness(struct led_classdev_flash *fled_cdev, u32 brightness) { struct led_classdev *led_cdev = &fled_cdev->led_cdev; struct led_flash_setting *s = &fled_cdev->brightness; s->val = brightness; led_clamp_align(s); if (!(led_cdev->flags & LED_SUSPENDED)) return call_flash_op(fled_cdev, flash_brightness_set, s->val); return 0; }

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EXPORT_SYMBOL_GPL(led_set_flash_brightness);
int led_update_flash_brightness(struct led_classdev_flash *fled_cdev) { struct led_flash_setting *s = &fled_cdev->brightness; u32 brightness; if (has_flash_op(fled_cdev, flash_brightness_get)) { int ret = call_flash_op(fled_cdev, flash_brightness_get, &brightness); if (ret < 0) return ret; s->val = brightness; } return 0; }

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EXPORT_SYMBOL_GPL(led_update_flash_brightness); MODULE_AUTHOR("Jacek Anaszewski <j.anaszewski@samsung.com>"); MODULE_DESCRIPTION("LED Flash class interface"); MODULE_LICENSE("GPL v2");

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Directory: drivers/leds
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