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[ARM] 5044/1: pwm_bl: add init/notify/exit callbacks 

This allows platform code to manipulate GPIOs and brightness level as
needed.

Signed-off-by: Philipp Zabel <philipp.zabel@gmail.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
This commit is contained in:
Philipp Zabel 2008-05-22 14:18:40 +01:00 committed by Russell King
parent 4a73071947
commit 3b73125af6
2 changed files with 35 additions and 7 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

39
drivers/video/backlight/pwm_bl.c
View File

@ -23,6 +23,7 @@
struct pwm_bl_data {
struct pwm_device *pwm;
unsigned int period;
int (*notify)(int brightness);
};
static int pwm_backlight_update_status(struct backlight_device *bl)
@ -37,6 +38,9 @@ static int pwm_backlight_update_status(struct backlight_device *bl)
if (bl->props.fb_blank != FB_BLANK_UNBLANK)
brightness = 0;
if (pb->notify)
brightness = pb->notify(brightness);
if (brightness == 0) {
pwm_config(pb->pwm, 0, pb->period);
pwm_disable(pb->pwm);
@ -62,30 +66,39 @@ static int pwm_backlight_probe(struct platform_device *pdev)
struct platform_pwm_backlight_data *data = pdev->dev.platform_data;
struct backlight_device *bl;
struct pwm_bl_data *pb;
int ret;
if (!data)
return -EINVAL;
if (data->init) {
ret = data->init(&pdev->dev);
if (ret < 0)
return ret;
}
pb = kzalloc(sizeof(*pb), GFP_KERNEL);
if (!pb)
return -ENOMEM;
if (!pb) {
ret = -ENOMEM;
goto err_alloc;
}
pb->period = data->pwm_period_ns;
pb->notify = data->notify;
pb->pwm = pwm_request(data->pwm_id, "backlight");
if (pb->pwm == NULL) {
dev_err(&pdev->dev, "unable to request PWM for backlight\n");
kfree(pb);
return -EBUSY;
ret = -EBUSY;
goto err_pwm;
}
bl = backlight_device_register(pdev->name, &pdev->dev,
pb, &pwm_backlight_ops);
if (IS_ERR(bl)) {
dev_err(&pdev->dev, "failed to register backlight\n");
pwm_free(pb->pwm);
kfree(pb);
return PTR_ERR(bl);
ret = PTR_ERR(bl);
goto err_bl;
}
bl->props.max_brightness = data->max_brightness;
@ -94,10 +107,20 @@ static int pwm_backlight_probe(struct platform_device *pdev)
platform_set_drvdata(pdev, bl);
return 0;
err_bl:
pwm_free(pb->pwm);
err_pwm:
kfree(pb);
err_alloc:
if (data->exit)
data->exit(&pdev->dev);
return ret;
}
static int pwm_backlight_remove(struct platform_device *pdev)
{
struct platform_pwm_backlight_data *data = pdev->dev.platform_data;
struct backlight_device *bl = platform_get_drvdata(pdev);
struct pwm_bl_data *pb = dev_get_drvdata(&bl->dev);
@ -106,6 +129,8 @@ static int pwm_backlight_remove(struct platform_device *pdev)
pwm_disable(pb->pwm);
pwm_free(pb->pwm);
kfree(pb);
if (data->exit)
data->exit(&pdev->dev);
return 0;
}

3
include/linux/pwm_backlight.h
View File

@ -9,6 +9,9 @@ struct platform_pwm_backlight_data {
unsigned int max_brightness;
unsigned int dft_brightness;
unsigned int pwm_period_ns;
int (*init)(struct device *dev);
int (*notify)(int brightness);
void (*exit)(struct device *dev);
};
#endif