diff options
| -rw-r--r-- | drivers/video/backlight/pwm_bl.c | 39 | ||||
| -rw-r--r-- | include/linux/pwm_backlight.h | 3 |
2 files changed, 35 insertions, 7 deletions
diff --git a/drivers/video/backlight/pwm_bl.c b/drivers/video/backlight/pwm_bl.c index 9637f5e08cb6..8346dfc01cf6 100644 --- a/drivers/video/backlight/pwm_bl.c +++ b/drivers/video/backlight/pwm_bl.c @@ -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; } diff --git a/include/linux/pwm_backlight.h b/include/linux/pwm_backlight.h index aeeffedbe822..7a9754c96775 100644 --- a/include/linux/pwm_backlight.h +++ b/include/linux/pwm_backlight.h @@ -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 |