Merge tag 'leds-for-5.1-rc1' of...

		timer. It can do gradual dimming and step change of brightness.

		The pattern is given by a series of tuples, of brightness and

		duration (ms). The LED is expected to traverse the series and

		each brightness value for the specified duration. Duration of

		0 means brightness should immediately change to new value, and

		writing malformed pattern deactivates any active one.

		duration (ms).

		1. For gradual dimming, the dimming interval now is set as 50

		milliseconds. So the tuple with duration less than dimming

		interval (50ms) is treated as a step change of brightness,

		i.e. the subsequent brightness will be applied without adding

		intervening dimming intervals.

		The gradual dimming format of the software pattern values should be:

		"brightness_1 duration_1 brightness_2 duration_2 brightness_3

		duration_3 ...". For example:

		echo 0 1000 255 2000 > pattern

		It will make the LED go gradually from zero-intensity to max (255)

		intensity in 1000 milliseconds, then back to zero intensity in 2000

		milliseconds:

		LED brightness

		    ^

		255-|       / \            / \            /

		    |      /    \         /    \         /

		    |     /       \      /       \      /

		    |    /          \   /          \   /

		  0-|   /             \/             \/

		    +---0----1----2----3----4----5----6------------> time (s)

		2. To make the LED go instantly from one brightness value to another,

		we should use zero-time lengths (the brightness must be same as

		the previous tuple's). So the format should be:

		"brightness_1 duration_1 brightness_1 0 brightness_2 duration_2

		brightness_2 0 ...". For example:

		echo 0 1000 0 0 255 2000 255 0 > pattern

		It will make the LED stay off for one second, then stay at max brightness

		for two seconds:

		LED brightness

		    ^

		255-|        +---------+    +---------+

		    |        |         |    |         |

		    |        |         |    |         |

		    |        |         |    |         |

		  0-|   -----+         +----+         +----

		    +---0----1----2----3----4----5----6------------> time (s)

		The exact format is described in:

		Documentation/devicetree/bindings/leds/leds-trigger-pattern.txt

What:		/sys/class/leds/<led>/hw_pattern

Date:		September 2018

     "ide-disk" - LED indicates IDE disk activity (deprecated),

                  in new implementations use "disk-activity"

     "timer" - LED flashes at a fixed, configurable rate

     "pattern" - LED alters the brightness for the specified duration with one

                 software timer (requires "led-pattern" property)

- led-pattern : Array of integers with default pattern for certain triggers.

                Each trigger may parse this property differently:

                - one-shot : two numbers specifying delay on and delay off (in ms),

                - timer : two numbers specifying delay on and delay off (in ms),

                - pattern : the pattern is given by a series of tuples, of

                  brightness and duration (in ms).  The exact format is

                  described in:

                  Documentation/devicetree/bindings/leds/leds-trigger-pattern.txt

- led-max-microamp : Maximum LED supply current in microamperes. This property

                     can be made mandatory for the board configurations

* Pattern format for LED pattern trigger

The pattern is given by a series of tuples, of brightness and duration (ms).

The LED is expected to traverse the series and each brightness value for the

specified duration. Duration of 0 means brightness should immediately change to

new value, and writing malformed pattern deactivates any active one.

1. For gradual dimming, the dimming interval now is set as 50 milliseconds. So

the tuple with duration less than dimming interval (50ms) is treated as a step

change of brightness, i.e. the subsequent brightness will be applied without

adding intervening dimming intervals.

The gradual dimming format of the software pattern values should be:

"brightness_1 duration_1 brightness_2 duration_2 brightness_3 duration_3 ...".

For example (using sysfs interface):

echo 0 1000 255 2000 > pattern

It will make the LED go gradually from zero-intensity to max (255) intensity in

1000 milliseconds, then back to zero intensity in 2000 milliseconds:

LED brightness

    ^

255-|       / \            / \            /

    |      /    \         /    \         /

    |     /       \      /       \      /

    |    /          \   /          \   /

  0-|   /             \/             \/

    +---0----1----2----3----4----5----6------------> time (s)

2. To make the LED go instantly from one brightness value to another, we should

use zero-time lengths (the brightness must be same as the previous tuple's). So

the format should be: "brightness_1 duration_1 brightness_1 0 brightness_2

duration_2 brightness_2 0 ...".

For example (using sysfs interface):

echo 0 1000 0 0 255 2000 255 0 > pattern

It will make the LED stay off for one second, then stay at max brightness for

two seconds:

LED brightness

    ^

255-|        +---------+    +---------+

    |        |         |    |         |

    |        |         |    |         |

    |        |         |    |         |

  0-|   -----+         +----+         +----

    +---0----1----2----3----4----5----6------------> time (s)

#include <linux/list.h>

#include <linux/module.h>

#include <linux/mutex.h>

#include <linux/of.h>

#include <linux/rwsem.h>

#include <linux/slab.h>

#include "leds.h"

DECLARE_RWSEM(leds_list_lock);

}

EXPORT_SYMBOL_GPL(led_update_brightness);

u32 *led_get_default_pattern(struct led_classdev *led_cdev, unsigned int *size)

{

	struct device_node *np = dev_of_node(led_cdev->dev);

	u32 *pattern;

	int count;

	if (!np)

		return NULL;

	count = of_property_count_u32_elems(np, "led-pattern");

	if (count < 0)

		return NULL;

	pattern = kcalloc(count, sizeof(*pattern), GFP_KERNEL);

	if (!pattern)

		return NULL;

	if (of_property_read_u32_array(np, "led-pattern", pattern, count)) {

		kfree(pattern);

		return NULL;

	}

	*size = count;

	return pattern;

}

EXPORT_SYMBOL_GPL(led_get_default_pattern);

/* Caller must ensure led_cdev->led_access held */

void led_sysfs_disable(struct led_classdev *led_cdev)

{

	if (!fw) {

		dev_err(dev, "firmware request failed\n");

		goto out;

		return;

	}

	/* handling firmware data is chip dependent */

	mutex_unlock(&chip->lock);

out:

	/* firmware should be released for other channel use */

	release_firmware(chip->fw);

	chip->fw = NULL;

}

static int lp55xx_request_firmware(struct lp55xx_chip *chip)