Revision a3f9bcab509a4bf003942e7e2048904cfe7cb5c5 authored by Rahul Sharma on 20 November 2012, 11:28:26 UTC, committed by Inki Dae on 05 December 2012, 05:39:21 UTC
This patch is to preserve the display mode header during the mode adjustment. Display mode header is overwritten with the adjusted mode header which is throwing the stack dump. Signed-off-by: Rahul Sharma <rahul.sharma@samsung.com> Signed-off-by: Inki Dae <inki.dae@samsung.com> Signed-off-by: Kyungmin Park <kyungmin.park@samsung.com>
1 parent 3dc5fa9
leds-pca9633.c
/*
* Copyright 2011 bct electronic GmbH
*
* Author: Peter Meerwald <p.meerwald@bct-electronic.com>
*
* Based on leds-pca955x.c
*
* This file is subject to the terms and conditions of version 2 of
* the GNU General Public License. See the file COPYING in the main
* directory of this archive for more details.
*
* LED driver for the PCA9633 I2C LED driver (7-bit slave address 0x62)
*
*/
#include <linux/module.h>
#include <linux/delay.h>
#include <linux/string.h>
#include <linux/ctype.h>
#include <linux/leds.h>
#include <linux/err.h>
#include <linux/i2c.h>
#include <linux/workqueue.h>
#include <linux/slab.h>
#include <linux/platform_data/leds-pca9633.h>
/* LED select registers determine the source that drives LED outputs */
#define PCA9633_LED_OFF 0x0 /* LED driver off */
#define PCA9633_LED_ON 0x1 /* LED driver on */
#define PCA9633_LED_PWM 0x2 /* Controlled through PWM */
#define PCA9633_LED_GRP_PWM 0x3 /* Controlled through PWM/GRPPWM */
#define PCA9633_MODE1 0x00
#define PCA9633_MODE2 0x01
#define PCA9633_PWM_BASE 0x02
#define PCA9633_LEDOUT 0x08
static const struct i2c_device_id pca9633_id[] = {
{ "pca9633", 0 },
{ }
};
MODULE_DEVICE_TABLE(i2c, pca9633_id);
struct pca9633_led {
struct i2c_client *client;
struct work_struct work;
enum led_brightness brightness;
struct led_classdev led_cdev;
int led_num; /* 0 .. 3 potentially */
char name[32];
};
static void pca9633_led_work(struct work_struct *work)
{
struct pca9633_led *pca9633 = container_of(work,
struct pca9633_led, work);
u8 ledout = i2c_smbus_read_byte_data(pca9633->client, PCA9633_LEDOUT);
int shift = 2 * pca9633->led_num;
u8 mask = 0x3 << shift;
switch (pca9633->brightness) {
case LED_FULL:
i2c_smbus_write_byte_data(pca9633->client, PCA9633_LEDOUT,
(ledout & ~mask) | (PCA9633_LED_ON << shift));
break;
case LED_OFF:
i2c_smbus_write_byte_data(pca9633->client, PCA9633_LEDOUT,
ledout & ~mask);
break;
default:
i2c_smbus_write_byte_data(pca9633->client,
PCA9633_PWM_BASE + pca9633->led_num,
pca9633->brightness);
i2c_smbus_write_byte_data(pca9633->client, PCA9633_LEDOUT,
(ledout & ~mask) | (PCA9633_LED_PWM << shift));
break;
}
}
static void pca9633_led_set(struct led_classdev *led_cdev,
enum led_brightness value)
{
struct pca9633_led *pca9633;
pca9633 = container_of(led_cdev, struct pca9633_led, led_cdev);
pca9633->brightness = value;
/*
* Must use workqueue for the actual I/O since I2C operations
* can sleep.
*/
schedule_work(&pca9633->work);
}
static int __devinit pca9633_probe(struct i2c_client *client,
const struct i2c_device_id *id)
{
struct pca9633_led *pca9633;
struct pca9633_platform_data *pdata;
int i, err;
pdata = client->dev.platform_data;
if (pdata) {
if (pdata->leds.num_leds <= 0 || pdata->leds.num_leds > 4) {
dev_err(&client->dev, "board info must claim at most 4 LEDs");
return -EINVAL;
}
}
pca9633 = devm_kzalloc(&client->dev, 4 * sizeof(*pca9633), GFP_KERNEL);
if (!pca9633)
return -ENOMEM;
i2c_set_clientdata(client, pca9633);
for (i = 0; i < 4; i++) {
pca9633[i].client = client;
pca9633[i].led_num = i;
/* Platform data can specify LED names and default triggers */
if (pdata && i < pdata->leds.num_leds) {
if (pdata->leds.leds[i].name)
snprintf(pca9633[i].name,
sizeof(pca9633[i].name), "pca9633:%s",
pdata->leds.leds[i].name);
if (pdata->leds.leds[i].default_trigger)
pca9633[i].led_cdev.default_trigger =
pdata->leds.leds[i].default_trigger;
} else {
snprintf(pca9633[i].name, sizeof(pca9633[i].name),
"pca9633:%d", i);
}
pca9633[i].led_cdev.name = pca9633[i].name;
pca9633[i].led_cdev.brightness_set = pca9633_led_set;
INIT_WORK(&pca9633[i].work, pca9633_led_work);
err = led_classdev_register(&client->dev, &pca9633[i].led_cdev);
if (err < 0)
goto exit;
}
/* Disable LED all-call address and set normal mode */
i2c_smbus_write_byte_data(client, PCA9633_MODE1, 0x00);
/* Configure output: open-drain or totem pole (push-pull) */
if (pdata && pdata->outdrv == PCA9633_OPEN_DRAIN)
i2c_smbus_write_byte_data(client, PCA9633_MODE2, 0x01);
/* Turn off LEDs */
i2c_smbus_write_byte_data(client, PCA9633_LEDOUT, 0x00);
return 0;
exit:
while (i--) {
led_classdev_unregister(&pca9633[i].led_cdev);
cancel_work_sync(&pca9633[i].work);
}
return err;
}
static int __devexit pca9633_remove(struct i2c_client *client)
{
struct pca9633_led *pca9633 = i2c_get_clientdata(client);
int i;
for (i = 0; i < 4; i++) {
led_classdev_unregister(&pca9633[i].led_cdev);
cancel_work_sync(&pca9633[i].work);
}
return 0;
}
static struct i2c_driver pca9633_driver = {
.driver = {
.name = "leds-pca9633",
.owner = THIS_MODULE,
},
.probe = pca9633_probe,
.remove = __devexit_p(pca9633_remove),
.id_table = pca9633_id,
};
module_i2c_driver(pca9633_driver);
MODULE_AUTHOR("Peter Meerwald <p.meerwald@bct-electronic.com>");
MODULE_DESCRIPTION("PCA9633 LED driver");
MODULE_LICENSE("GPL v2");
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