linux/drivers/leds/leds-lp8788.c

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/*
* TI LP8788 MFD - keyled driver
*
* Copyright 2012 Texas Instruments
*
* Author: Milo(Woogyom) Kim <milo.kim@ti.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/module.h>
#include <linux/slab.h>
#include <linux/err.h>
#include <linux/platform_device.h>
#include <linux/leds.h>
#include <linux/mutex.h>
#include <linux/mfd/lp8788.h>
#include <linux/mfd/lp8788-isink.h>
#define MAX_BRIGHTNESS LP8788_ISINK_MAX_PWM
#define DEFAULT_LED_NAME "keyboard-backlight"
struct lp8788_led {
struct lp8788 *lp;
struct mutex lock;
struct work_struct work;
struct led_classdev led_dev;
enum lp8788_isink_number isink_num;
enum led_brightness brightness;
int on;
};
struct lp8788_led_config {
enum lp8788_isink_scale scale;
enum lp8788_isink_number num;
int iout;
};
static struct lp8788_led_config default_led_config = {
.scale = LP8788_ISINK_SCALE_100mA,
.num = LP8788_ISINK_3,
.iout = 0,
};
static int lp8788_led_init_device(struct lp8788_led *led,
struct lp8788_led_platform_data *pdata)
{
struct lp8788_led_config *cfg = &default_led_config;
u8 addr, mask, val;
int ret;
if (pdata) {
cfg->scale = pdata->scale;
cfg->num = pdata->num;
cfg->iout = pdata->iout_code;
}
led->isink_num = cfg->num;
/* scale configuration */
addr = LP8788_ISINK_CTRL;
mask = 1 << (cfg->num + LP8788_ISINK_SCALE_OFFSET);
val = cfg->scale << (cfg->num + LP8788_ISINK_SCALE_OFFSET);
ret = lp8788_update_bits(led->lp, addr, mask, val);
if (ret)
return ret;
/* current configuration */
addr = lp8788_iout_addr[cfg->num];
mask = lp8788_iout_mask[cfg->num];
val = cfg->iout;
return lp8788_update_bits(led->lp, addr, mask, val);
}
static void lp8788_led_enable(struct lp8788_led *led,
enum lp8788_isink_number num, int on)
{
u8 mask = 1 << num;
u8 val = on << num;
if (lp8788_update_bits(led->lp, LP8788_ISINK_CTRL, mask, val))
return;
led->on = on;
}
static void lp8788_led_work(struct work_struct *work)
{
struct lp8788_led *led = container_of(work, struct lp8788_led, work);
enum lp8788_isink_number num = led->isink_num;
int enable;
u8 val = led->brightness;
mutex_lock(&led->lock);
switch (num) {
case LP8788_ISINK_1:
case LP8788_ISINK_2:
case LP8788_ISINK_3:
lp8788_write_byte(led->lp, lp8788_pwm_addr[num], val);
break;
default:
mutex_unlock(&led->lock);
return;
}
enable = (val > 0) ? 1 : 0;
if (enable != led->on)
lp8788_led_enable(led, num, enable);
mutex_unlock(&led->lock);
}
static void lp8788_brightness_set(struct led_classdev *led_cdev,
enum led_brightness brt_val)
{
struct lp8788_led *led =
container_of(led_cdev, struct lp8788_led, led_dev);
led->brightness = brt_val;
schedule_work(&led->work);
}
static __devinit int lp8788_led_probe(struct platform_device *pdev)
{
struct lp8788 *lp = dev_get_drvdata(pdev->dev.parent);
struct lp8788_led_platform_data *led_pdata;
struct lp8788_led *led;
int ret;
led = devm_kzalloc(lp->dev, sizeof(struct lp8788_led), GFP_KERNEL);
if (!led)
return -ENOMEM;
led->lp = lp;
led->led_dev.max_brightness = MAX_BRIGHTNESS;
led->led_dev.brightness_set = lp8788_brightness_set;
led_pdata = lp->pdata ? lp->pdata->led_pdata : NULL;
if (!led_pdata || !led_pdata->name)
led->led_dev.name = DEFAULT_LED_NAME;
else
led->led_dev.name = led_pdata->name;
mutex_init(&led->lock);
INIT_WORK(&led->work, lp8788_led_work);
platform_set_drvdata(pdev, led);
ret = lp8788_led_init_device(led, led_pdata);
if (ret) {
dev_err(lp->dev, "led init device err: %d\n", ret);
return ret;
}
ret = led_classdev_register(lp->dev, &led->led_dev);
if (ret) {
dev_err(lp->dev, "led register err: %d\n", ret);
return ret;
}
return 0;
}
static int __devexit lp8788_led_remove(struct platform_device *pdev)
{
struct lp8788_led *led = platform_get_drvdata(pdev);
led_classdev_unregister(&led->led_dev);
workqueue: deprecate flush[_delayed]_work_sync() flush[_delayed]_work_sync() are now spurious. Mark them deprecated and convert all users to flush[_delayed]_work(). If you're cc'd and wondering what's going on: Now all workqueues are non-reentrant and the regular flushes guarantee that the work item is not pending or running on any CPU on return, so there's no reason to use the sync flushes at all and they're going away. This patch doesn't make any functional difference. Signed-off-by: Tejun Heo <tj@kernel.org> Cc: Russell King <linux@arm.linux.org.uk> Cc: Paul Mundt <lethal@linux-sh.org> Cc: Ian Campbell <ian.campbell@citrix.com> Cc: Jens Axboe <axboe@kernel.dk> Cc: Mattia Dongili <malattia@linux.it> Cc: Kent Yoder <key@linux.vnet.ibm.com> Cc: David Airlie <airlied@linux.ie> Cc: Jiri Kosina <jkosina@suse.cz> Cc: Karsten Keil <isdn@linux-pingi.de> Cc: Bryan Wu <bryan.wu@canonical.com> Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org> Cc: Alasdair Kergon <agk@redhat.com> Cc: Mauro Carvalho Chehab <mchehab@infradead.org> Cc: Florian Tobias Schandinat <FlorianSchandinat@gmx.de> Cc: David Woodhouse <dwmw2@infradead.org> Cc: "David S. Miller" <davem@davemloft.net> Cc: linux-wireless@vger.kernel.org Cc: Anton Vorontsov <cbou@mail.ru> Cc: Sangbeom Kim <sbkim73@samsung.com> Cc: "James E.J. Bottomley" <James.Bottomley@HansenPartnership.com> Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org> Cc: Eric Van Hensbergen <ericvh@gmail.com> Cc: Takashi Iwai <tiwai@suse.de> Cc: Steven Whitehouse <swhiteho@redhat.com> Cc: Petr Vandrovec <petr@vandrovec.name> Cc: Mark Fasheh <mfasheh@suse.com> Cc: Christoph Hellwig <hch@infradead.org> Cc: Avi Kivity <avi@redhat.com>
2012-08-20 21:51:24 +00:00
flush_work(&led->work);
return 0;
}
static struct platform_driver lp8788_led_driver = {
.probe = lp8788_led_probe,
.remove = __devexit_p(lp8788_led_remove),
.driver = {
.name = LP8788_DEV_KEYLED,
.owner = THIS_MODULE,
},
};
module_platform_driver(lp8788_led_driver);
MODULE_DESCRIPTION("Texas Instruments LP8788 Keyboard LED Driver");
MODULE_AUTHOR("Milo Kim");
MODULE_LICENSE("GPL");
MODULE_ALIAS("platform:lp8788-keyled");