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led: Enable led in 88pm860x
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Enable led sub device in Marvell 88PM860x. Two LED arrays can be supported.
Each LED array can be used for R,G,B leds.

Signed-off-by: Haojian Zhuang <haojian.zhuang@marvell.com>
Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>
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Haojian Zhuang authored and Samuel Ortiz committed Mar 7, 2010
1 parent d07e8bf commit 0a2f915
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7 changes: 7 additions & 0 deletions drivers/leds/Kconfig
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Expand Up @@ -17,6 +17,13 @@ config LEDS_CLASS

comment "LED drivers"

config LEDS_88PM860X
tristate "LED Support for Marvell 88PM860x PMIC"
depends on LEDS_CLASS && MFD_88PM860X
help
This option enables support for on-chip LED drivers found on Marvell
Semiconductor 88PM8606 PMIC.

config LEDS_ATMEL_PWM
tristate "LED Support using Atmel PWM outputs"
depends on LEDS_CLASS && ATMEL_PWM
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1 change: 1 addition & 0 deletions drivers/leds/Makefile
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Expand Up @@ -5,6 +5,7 @@ obj-$(CONFIG_LEDS_CLASS) += led-class.o
obj-$(CONFIG_LEDS_TRIGGERS) += led-triggers.o

# LED Platform Drivers
obj-$(CONFIG_LEDS_88PM860X) += leds-88pm860x.o
obj-$(CONFIG_LEDS_ATMEL_PWM) += leds-atmel-pwm.o
obj-$(CONFIG_LEDS_BD2802) += leds-bd2802.o
obj-$(CONFIG_LEDS_LOCOMO) += leds-locomo.o
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325 changes: 325 additions & 0 deletions drivers/leds/leds-88pm860x.c
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@@ -0,0 +1,325 @@
/*
* 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/workqueue.h>
#include <linux/mfd/88pm860x.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_PERIOD_MASK (0x0F << 3)
#define LED_BLINK_MASK (0x7F)

#define LED_BLINK_ON(x) ((x & 0x7) * 66 + 66)
#define LED_BLINK_PERIOD(x) ((x & 0xF) * 530 + 930)
#define LED_BLINK_ON_MIN LED_BLINK_ON(0)
#define LED_BLINK_ON_MAX LED_BLINK_ON(0x7)
#define LED_BLINK_PERIOD_MIN LED_BLINK_PERIOD(0)
#define LED_BLINK_PERIOD_MAX LED_BLINK_PERIOD(0xE)
#define LED_TO_ON(x) ((x - 66) / 66)
#define LED_TO_PERIOD(x) ((x - 930) / 530)

#define LED1_BLINK_EN (1 << 1)
#define LED2_BLINK_EN (1 << 2)

enum {
SET_BRIGHTNESS,
SET_BLINK,
};

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;
int command;
int offset;
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;
case PM8606_LED2_RED:
case PM8606_LED2_GREEN:
case PM8606_LED2_BLUE:
ret = PM8606_RGB2A;
}
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_set(struct pm860x_led *led, int command)
{
struct pm860x_chip *chip = led->chip;
int mask, ret;

mutex_lock(&led->lock);
switch (command) {
case SET_BRIGHTNESS:
if ((led->current_brightness == 0) && led->brightness) {
if (led->iset) {
ret = pm860x_set_bits(led->i2c, led->offset,
LED_CURRENT_MASK, led->iset);
if (ret < 0)
goto out;
}
} else if (led->brightness == 0) {
ret = pm860x_set_bits(led->i2c, led->offset,
LED_CURRENT_MASK, 0);
if (ret < 0)
goto out;
}
ret = pm860x_set_bits(led->i2c, led->offset, LED_PWM_MASK,
led->brightness);
if (ret < 0)
goto out;
led->current_brightness = led->brightness;
dev_dbg(chip->dev, "Update LED. (reg:%d, brightness:%d)\n",
led->offset, led->brightness);
break;
case SET_BLINK:
ret = pm860x_set_bits(led->i2c, led->offset,
LED_BLINK_MASK, led->blink_data);
if (ret < 0)
goto out;

mask = __blink_ctl_mask(led->port);
ret = pm860x_set_bits(led->i2c, PM8606_WLED3B, mask, mask);
if (ret < 0)
goto out;
dev_dbg(chip->dev, "LED blink delay on:%dms, delay off:%dms\n",
led->blink_on, led->blink_off);
break;
}
out:
mutex_unlock(&led->lock);
return 0;
}

static void pm860x_led_work(struct work_struct *work)
{
struct pm860x_led *led;

led = container_of(work, struct pm860x_led, work);
__led_set(led, led->command);
}

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->offset = __led_off(data->port);
data->brightness = value >> 3;
data->command = SET_BRIGHTNESS;
schedule_work(&data->work);
}

static int pm860x_led_blink(struct led_classdev *cdev,
unsigned long *delay_on,
unsigned long *delay_off)
{
struct pm860x_led *data = container_of(cdev, struct pm860x_led, cdev);
int period, on;

on = *delay_on;
if ((on < LED_BLINK_ON_MIN) || (on > LED_BLINK_ON_MAX))
return -EINVAL;

on = LED_TO_ON(on);
on = LED_BLINK_ON(on);

period = on + *delay_off;
if ((period < LED_BLINK_PERIOD_MIN) || (period > LED_BLINK_PERIOD_MAX))
return -EINVAL;
period = LED_TO_PERIOD(period);
period = LED_BLINK_PERIOD(period);

data->offset = __blink_off(data->port);
data->blink_on = on;
data->blink_off = period - data->blink_on;
data->blink_data = (period << 3) | data->blink_on;
data->command = SET_BLINK;
schedule_work(&data->work);

return 0;
}

static int __check_device(struct pm860x_led_pdata *pdata, char *name)
{
struct pm860x_led_pdata *p = pdata;
int ret = -EINVAL;

while (p && p->id) {
if ((p->id != PM8606_ID_LED) || (p->flags < 0))
break;

if (!strncmp(name, pm860x_led_name[p->flags],
MFD_NAME_SIZE)) {
ret = (int)p->flags;
break;
}
p++;
}
return ret;
}

static int pm860x_led_probe(struct platform_device *pdev)
{
struct pm860x_chip *chip = dev_get_drvdata(pdev->dev.parent);
struct pm860x_platform_data *pm860x_pdata;
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;
}

if (pdev->dev.parent->platform_data) {
pm860x_pdata = pdev->dev.parent->platform_data;
pdata = pm860x_pdata->led;
} else
pdata = NULL;

data = kzalloc(sizeof(struct pm860x_led), GFP_KERNEL);
if (data == NULL)
return -ENOMEM;
strncpy(data->name, res->name, MFD_NAME_SIZE);
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 = __check_device(pdata, data->name);
if (data->port < 0)
return -EINVAL;

data->current_brightness = 0;
data->cdev.name = data->name;
data->cdev.brightness_set = pm860x_led_set;
data->cdev.blink_set = pm860x_led_blink;
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;
}
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,
};

static int __devinit pm860x_led_init(void)
{
return platform_driver_register(&pm860x_led_driver);
}
module_init(pm860x_led_init);

static void __devexit pm860x_led_exit(void)
{
platform_driver_unregister(&pm860x_led_driver);
}
module_exit(pm860x_led_exit);

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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