forked from luck/tmp_suning_uos_patched
drivers/leds: add driver for PCA9633 I2C chip
Driver for the PCA9633 I2C chip supporting four LEDs and 255 brightness levels. [akpm@linux-foundation.org: fix kcalloc() call] [axel.lin@gmail.com: fix kcalloc parameters swapped] Signed-off-by: Peter Meerwald <p.meerwald@bct-electronic.com> Signed-off-by: Axel Lin <axel.lin@gmail.com> Cc: Lars-Peter Clausen <lars@metafoo.de> Cc: Richard Purdie <rpurdie@rpsys.net> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Peter Meerwald
Linus Torvalds
parent
d06cb46c3e
commit
75cb2e1d1a
@ -234,6 +234,14 @@ config LEDS_PCA955X
|
||||
LED driver chips accessed via the I2C bus. Supported
|
||||
devices include PCA9550, PCA9551, PCA9552, and PCA9553.
|
||||
|
||||
config LEDS_PCA9633
|
||||
tristate "LED support for PCA9633 I2C chip"
|
||||
depends on LEDS_CLASS
|
||||
depends on I2C
|
||||
help
|
||||
This option enables support for LEDs connected to the PCA9633
|
||||
LED driver chip accessed via the I2C bus.
|
||||
|
||||
config LEDS_WM831X_STATUS
|
||||
tristate "LED support for status LEDs on WM831x PMICs"
|
||||
depends on LEDS_CLASS
|
||||
|
||||
@ -30,6 +30,7 @@ obj-$(CONFIG_LEDS_HP6XX) += leds-hp6xx.o
|
||||
obj-$(CONFIG_LEDS_OT200) += leds-ot200.o
|
||||
obj-$(CONFIG_LEDS_FSG) += leds-fsg.o
|
||||
obj-$(CONFIG_LEDS_PCA955X) += leds-pca955x.o
|
||||
obj-$(CONFIG_LEDS_PCA9633) += leds-pca9633.o
|
||||
obj-$(CONFIG_LEDS_DA903X) += leds-da903x.o
|
||||
obj-$(CONFIG_LEDS_WM831X_STATUS) += leds-wm831x-status.o
|
||||
obj-$(CONFIG_LEDS_WM8350) += leds-wm8350.o
|
||||
|
||||
195
drivers/leds/leds-pca9633.c
Normal file
195
drivers/leds/leds-pca9633.c
Normal file
@ -0,0 +1,195 @@
|
||||
/*
|
||||
* 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>
|
||||
|
||||
/* 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 i2c_adapter *adapter;
|
||||
struct led_platform_data *pdata;
|
||||
int i, err;
|
||||
|
||||
adapter = to_i2c_adapter(client->dev.parent);
|
||||
pdata = client->dev.platform_data;
|
||||
|
||||
if (pdata) {
|
||||
if (pdata->num_leds <= 0 || pdata->num_leds > 4) {
|
||||
dev_err(&client->dev, "board info must claim at most 4 LEDs");
|
||||
return -EINVAL;
|
||||
}
|
||||
}
|
||||
|
||||
pca9633 = kcalloc(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->num_leds) {
|
||||
if (pdata->leds[i].name)
|
||||
snprintf(pca9633[i].name,
|
||||
sizeof(pca9633[i].name), "pca9633:%s",
|
||||
pdata->leds[i].name);
|
||||
if (pdata->leds[i].default_trigger)
|
||||
pca9633[i].led_cdev.default_trigger =
|
||||
pdata->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);
|
||||
|
||||
/* 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);
|
||||
}
|
||||
|
||||
kfree(pca9633);
|
||||
|
||||
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);
|
||||
}
|
||||
|
||||
kfree(pca9633);
|
||||
|
||||
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");
|
||||
Loading…
Reference in New Issue
Block a user