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leds: LED driver for National Semiconductor LP3944 Funlight Chip

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LEDs driver for National Semiconductor LP3944 Funlight Chip
http://www.national.com/pf/LP/LP3944.html

This helper chip can drive up to 8 leds, with two programmable DIM
modes; it could even be used as a gpio expander but this driver assumes
it is used as a led controller.

The DIM modes are used to set _blink_ patterns for leds, the pattern is
specified supplying two parameters:
  - period: from 0s to 1.6s
  - duty cycle: percentage of the period the led is on, from 0 to 100

LP3944 can be found on Motorola A910 smartphone, where it drives the rgb
leds, the camera flash light and the displays backlights.

Signed-off-by: Antonio Ospite <ospite@studenti.unina.it>
Signed-off-by: Richard Purdie <rpurdie@linux.intel.com>
This commit is contained in:
Antonio Ospite
2009-06-19 13:55:42 +02:00
committed by Richard Purdie
parent 07172d2bfa
commit 5054d39e32
5 changed files with 581 additions and 0 deletions
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53
include/linux/leds-lp3944.h Normal file
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/*
* leds-lp3944.h - platform data structure for lp3944 led controller
*
* Copyright (C) 2009 Antonio Ospite <ospite@studenti.unina.it>
*
* 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.
*
*/
#ifndef __LINUX_LEDS_LP3944_H
#define __LINUX_LEDS_LP3944_H
#include <linux/leds.h>
#include <linux/workqueue.h>
#define LP3944_LED0 0
#define LP3944_LED1 1
#define LP3944_LED2 2
#define LP3944_LED3 3
#define LP3944_LED4 4
#define LP3944_LED5 5
#define LP3944_LED6 6
#define LP3944_LED7 7
#define LP3944_LEDS_MAX 8
#define LP3944_LED_STATUS_MASK 0x03
enum lp3944_status {
LP3944_LED_STATUS_OFF = 0x0,
LP3944_LED_STATUS_ON = 0x1,
LP3944_LED_STATUS_DIM0 = 0x2,
LP3944_LED_STATUS_DIM1 = 0x3
};
enum lp3944_type {
LP3944_LED_TYPE_NONE,
LP3944_LED_TYPE_LED,
LP3944_LED_TYPE_LED_INVERTED,
};
struct lp3944_led {
char *name;
enum lp3944_type type;
enum lp3944_status status;
};
struct lp3944_platform_data {
struct lp3944_led leds[LP3944_LEDS_MAX];
u8 leds_size;
};
#endif /* __LINUX_LEDS_LP3944_H */