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leds: add output driver configuration for pca9633 led driver 

the pca9633 leds driver can be used in open-drain or totem pole (a.k.a.
push/pull) output driver mode; default is the later

the patch allows to set the output driver mode using platform data (similar to
configuration inferface provided by the tca6507 led driver)

v2: move leds-pca9633.h to include/linux/platform_data/ (Bryan Wu)

Signed-off-by: Peter Meerwald <p.meerwald@bct-electronic.com>
Signed-off-by: Bryan Wu <bryan.wu@canonical.com>
hifive-unleashed-5.1
Peter Meerwald 2012-09-24 14:53:49 +08:00 committed by Bryan Wu
parent e76a322af1
commit 2f73c39273
2 changed files with 47 additions and 7 deletions
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19
drivers/leds/leds-pca9633.c
View File

@ -22,6 +22,7 @@
#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 */
@ -96,13 +97,13 @@ static int __devinit pca9633_probe(struct i2c_client *client,
const struct i2c_device_id *id)
{
struct pca9633_led *pca9633;
struct led_platform_data *pdata;
struct pca9633_platform_data *pdata;
int i, err;
pdata = client->dev.platform_data;
if (pdata) {
if (pdata->num_leds <= 0 || pdata->num_leds > 4) {
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;
}
@ -119,14 +120,14 @@ static int __devinit pca9633_probe(struct i2c_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)
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[i].name);
if (pdata->leds[i].default_trigger)
pdata->leds.leds[i].name);
if (pdata->leds.leds[i].default_trigger)
pca9633[i].led_cdev.default_trigger =
pdata->leds[i].default_trigger;
pdata->leds.leds[i].default_trigger;
} else {
snprintf(pca9633[i].name, sizeof(pca9633[i].name),
"pca9633:%d", i);
@ -145,6 +146,10 @@ static int __devinit pca9633_probe(struct i2c_client *client,
/* 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);

35
include/linux/platform_data/leds-pca9633.h 100644
View File

@ -0,0 +1,35 @@
/*
* PCA9633 LED chip driver.
*
* Copyright 2012 bct electronic GmbH
*
* 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.
*
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
* 02110-1301 USA
*/
#ifndef __LINUX_PCA9633_H
#define __LINUX_PCA9633_H
#include <linux/leds.h>
enum pca9633_outdrv {
PCA9633_OPEN_DRAIN,
PCA9633_TOTEM_POLE, /* aka push-pull */
};
struct pca9633_platform_data {
struct led_platform_data leds;
enum pca9633_outdrv outdrv;
};
#endif /* __LINUX_PCA9633_H*/