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linux/drivers/leds/leds-88pm860x.c
Jett.Zhou b3b97473ee led: Modified power control of pm860x led 
Since several sub modules such as backlight, leds and vibrator depend
on the refernce group and internal oscillator in pm8606, so modified
the power control of led in pm8606 by unified interface.

Signed-off-by: Jett.Zhou <jtzhou@marvell.com>
Cc: Richard Purdie <rpurdie@rpsys.net>
Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>
2012-03-06 18:46:53 +01:00

269 lines
6.2 KiB
C
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/*
* LED driver for Marvell 88PM860x
*
* Copyright (C) 2009 Marvell International Ltd.
* Haojian Zhuang <haojian.zhuang@marvell.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/kernel.h>
#include <linux/init.h>
#include <linux/platform_device.h>
#include <linux/i2c.h>
#include <linux/leds.h>
#include <linux/slab.h>
#include <linux/workqueue.h>
#include <linux/mfd/88pm860x.h>
#include <linux/module.h>
#define LED_PWM_SHIFT (3)
#define LED_PWM_MASK (0x1F)
#define LED_CURRENT_MASK (0x07 << 5)
#define LED_BLINK_ON_MASK (0x07)
#define LED_BLINK_MASK (0x7F)
#define LED_BLINK_ON(x) ((x & 0x7) * 66 + 66)
#define LED_BLINK_ON_MIN LED_BLINK_ON(0)
#define LED_BLINK_ON_MAX LED_BLINK_ON(0x7)
#define LED_ON_CONTINUOUS (0x0F << 3)
#define LED_TO_ON(x) ((x - 66) / 66)
#define LED1_BLINK_EN (1 << 1)
#define LED2_BLINK_EN (1 << 2)
struct pm860x_led {
struct led_classdev cdev;
struct i2c_client *i2c;
struct work_struct work;
struct pm860x_chip *chip;
struct mutex lock;
char name[MFD_NAME_SIZE];
int port;
int iset;
unsigned char brightness;
unsigned char current_brightness;
int blink_data;
int blink_time;
int blink_on;
int blink_off;
};
/* return offset of color register */
static inline int __led_off(int port)
{
int ret = -EINVAL;
switch (port) {
case PM8606_LED1_RED:
case PM8606_LED1_GREEN:
case PM8606_LED1_BLUE:
ret = port - PM8606_LED1_RED + PM8606_RGB1B;
break;
case PM8606_LED2_RED:
case PM8606_LED2_GREEN:
case PM8606_LED2_BLUE:
ret = port - PM8606_LED2_RED + PM8606_RGB2B;
break;
}
return ret;
}
/* return offset of blink register */
static inline int __blink_off(int port)
{
int ret = -EINVAL;
switch (port) {
case PM8606_LED1_RED:
case PM8606_LED1_GREEN:
case PM8606_LED1_BLUE:
ret = PM8606_RGB1A;
break;
case PM8606_LED2_RED:
case PM8606_LED2_GREEN:
case PM8606_LED2_BLUE:
ret = PM8606_RGB2A;
break;
}
return ret;
}
static inline int __blink_ctl_mask(int port)
{
int ret = -EINVAL;
switch (port) {
case PM8606_LED1_RED:
case PM8606_LED1_GREEN:
case PM8606_LED1_BLUE:
ret = LED1_BLINK_EN;
break;
case PM8606_LED2_RED:
case PM8606_LED2_GREEN:
case PM8606_LED2_BLUE:
ret = LED2_BLINK_EN;
break;
}
return ret;
}
static int led_power_set(struct pm860x_chip *chip, int port, int on)
{
int ret = -EINVAL;
switch (port) {
case PM8606_LED1_RED:
case PM8606_LED1_GREEN:
case PM8606_LED1_BLUE:
ret = on ? pm8606_osc_enable(chip, RGB1_ENABLE) :
pm8606_osc_disable(chip, RGB1_ENABLE);
break;
case PM8606_LED2_RED:
case PM8606_LED2_GREEN:
case PM8606_LED2_BLUE:
ret = on ? pm8606_osc_enable(chip, RGB2_ENABLE) :
pm8606_osc_disable(chip, RGB2_ENABLE);
break;
}
return ret;
}
static void pm860x_led_work(struct work_struct *work)
{
struct pm860x_led *led;
struct pm860x_chip *chip;
unsigned char buf[3];
int mask, ret;
led = container_of(work, struct pm860x_led, work);
chip = led->chip;
mutex_lock(&led->lock);
if ((led->current_brightness == 0) && led->brightness) {
led_power_set(chip, led->port, 1);
if (led->iset) {
pm860x_set_bits(led->i2c, __led_off(led->port),
LED_CURRENT_MASK, led->iset);
}
pm860x_set_bits(led->i2c, __blink_off(led->port),
LED_BLINK_MASK, LED_ON_CONTINUOUS);
mask = __blink_ctl_mask(led->port);
pm860x_set_bits(led->i2c, PM8606_WLED3B, mask, mask);
}
pm860x_set_bits(led->i2c, __led_off(led->port), LED_PWM_MASK,
led->brightness);
if (led->brightness == 0) {
pm860x_bulk_read(led->i2c, __led_off(led->port), 3, buf);
ret = buf[0] & LED_PWM_MASK;
ret |= buf[1] & LED_PWM_MASK;
ret |= buf[2] & LED_PWM_MASK;
if (ret == 0) {
/* unset current since no led is lighting */
pm860x_set_bits(led->i2c, __led_off(led->port),
LED_CURRENT_MASK, 0);
mask = __blink_ctl_mask(led->port);
pm860x_set_bits(led->i2c, PM8606_WLED3B, mask, 0);
led_power_set(chip, led->port, 0);
}
}
led->current_brightness = led->brightness;
dev_dbg(chip->dev, "Update LED. (reg:%d, brightness:%d)\n",
__led_off(led->port), led->brightness);
mutex_unlock(&led->lock);
}
static void pm860x_led_set(struct led_classdev *cdev,
enum led_brightness value)
{
struct pm860x_led *data = container_of(cdev, struct pm860x_led, cdev);
data->brightness = value >> 3;
schedule_work(&data->work);
}
static int pm860x_led_probe(struct platform_device *pdev)
{
struct pm860x_chip *chip = dev_get_drvdata(pdev->dev.parent);
struct pm860x_led_pdata *pdata;
struct pm860x_led *data;
struct resource *res;
int ret;
res = platform_get_resource(pdev, IORESOURCE_IO, 0);
if (res == NULL) {
dev_err(&pdev->dev, "No I/O resource!\n");
return -EINVAL;
}
pdata = pdev->dev.platform_data;
if (pdata == NULL) {
dev_err(&pdev->dev, "No platform data!\n");
return -EINVAL;
}
data = kzalloc(sizeof(struct pm860x_led), GFP_KERNEL);
if (data == NULL)
return -ENOMEM;
strncpy(data->name, res->name, MFD_NAME_SIZE - 1);
dev_set_drvdata(&pdev->dev, data);
data->chip = chip;
data->i2c = (chip->id == CHIP_PM8606) ? chip->client : chip->companion;
data->iset = pdata->iset;
data->port = pdata->flags;
if (data->port < 0) {
dev_err(&pdev->dev, "check device failed\n");
kfree(data);
return -EINVAL;
}
data->current_brightness = 0;
data->cdev.name = data->name;
data->cdev.brightness_set = pm860x_led_set;
mutex_init(&data->lock);
INIT_WORK(&data->work, pm860x_led_work);
ret = led_classdev_register(chip->dev, &data->cdev);
if (ret < 0) {
dev_err(&pdev->dev, "Failed to register LED: %d\n", ret);
goto out;
}
pm860x_led_set(&data->cdev, 0);
return 0;
out:
kfree(data);
return ret;
}
static int pm860x_led_remove(struct platform_device *pdev)
{
struct pm860x_led *data = platform_get_drvdata(pdev);
led_classdev_unregister(&data->cdev);
kfree(data);
return 0;
}
static struct platform_driver pm860x_led_driver = {
.driver = {
.name = "88pm860x-led",
.owner = THIS_MODULE,
},
.probe = pm860x_led_probe,
.remove = pm860x_led_remove,
};
module_platform_driver(pm860x_led_driver);
MODULE_DESCRIPTION("LED driver for Marvell PM860x");
MODULE_AUTHOR("Haojian Zhuang <haojian.zhuang@marvell.com>");
MODULE_LICENSE("GPL");
MODULE_ALIAS("platform:88pm860x-led");
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