X-Git-Url: http://git.onelab.eu/?a=blobdiff_plain;f=drivers%2Fvideo%2Fbacklight%2Flcd.c;h=f6e041627edbb874419cc146ecd6df167fbe67c1;hb=refs%2Fheads%2Fvserver;hp=86908a60c630d9624fab519c24d1ab0f28091e3b;hpb=76828883507a47dae78837ab5dec5a5b4513c667;p=linux-2.6.git diff --git a/drivers/video/backlight/lcd.c b/drivers/video/backlight/lcd.c index 86908a60c..f6e041627 100644 --- a/drivers/video/backlight/lcd.c +++ b/drivers/video/backlight/lcd.c @@ -14,6 +14,53 @@ #include #include +#if defined(CONFIG_FB) || (defined(CONFIG_FB_MODULE) && \ + defined(CONFIG_LCD_CLASS_DEVICE_MODULE)) +/* This callback gets called when something important happens inside a + * framebuffer driver. We're looking if that important event is blanking, + * and if it is, we're switching lcd power as well ... + */ +static int fb_notifier_callback(struct notifier_block *self, + unsigned long event, void *data) +{ + struct lcd_device *ld; + struct fb_event *evdata = data; + + /* If we aren't interested in this event, skip it immediately ... */ + if (event != FB_EVENT_BLANK) + return 0; + + ld = container_of(self, struct lcd_device, fb_notif); + down(&ld->sem); + if (ld->props) + if (!ld->props->check_fb || ld->props->check_fb(evdata->info)) + ld->props->set_power(ld, *(int *)evdata->data); + up(&ld->sem); + return 0; +} + +static int lcd_register_fb(struct lcd_device *ld) +{ + memset(&ld->fb_notif, 0, sizeof(&ld->fb_notif)); + ld->fb_notif.notifier_call = fb_notifier_callback; + return fb_register_client(&ld->fb_notif); +} + +static void lcd_unregister_fb(struct lcd_device *ld) +{ + fb_unregister_client(&ld->fb_notif); +} +#else +static int lcd_register_fb(struct lcd_device *ld) +{ + return 0; +} + +static inline void lcd_unregister_fb(struct lcd_device *ld) +{ +} +#endif /* CONFIG_FB */ + static ssize_t lcd_show_power(struct class_device *cdev, char *buf) { int rc; @@ -31,12 +78,15 @@ static ssize_t lcd_show_power(struct class_device *cdev, char *buf) static ssize_t lcd_store_power(struct class_device *cdev, const char *buf, size_t count) { - int rc, power; + int rc = -ENXIO; char *endp; struct lcd_device *ld = to_lcd_device(cdev); + int power = simple_strtoul(buf, &endp, 0); + size_t size = endp - buf; - power = simple_strtoul(buf, &endp, 0); - if (*endp && !isspace(*endp)) + if (*endp && isspace(*endp)) + size++; + if (size != count) return -EINVAL; down(&ld->sem); @@ -44,8 +94,7 @@ static ssize_t lcd_store_power(struct class_device *cdev, const char *buf, size_ pr_debug("lcd: set power to %d\n", power); ld->props->set_power(ld, power); rc = count; - } else - rc = -ENXIO; + } up(&ld->sem); return rc; @@ -53,14 +102,12 @@ static ssize_t lcd_store_power(struct class_device *cdev, const char *buf, size_ static ssize_t lcd_show_contrast(struct class_device *cdev, char *buf) { - int rc; + int rc = -ENXIO; struct lcd_device *ld = to_lcd_device(cdev); down(&ld->sem); if (likely(ld->props && ld->props->get_contrast)) rc = sprintf(buf, "%d\n", ld->props->get_contrast(ld)); - else - rc = -ENXIO; up(&ld->sem); return rc; @@ -68,12 +115,15 @@ static ssize_t lcd_show_contrast(struct class_device *cdev, char *buf) static ssize_t lcd_store_contrast(struct class_device *cdev, const char *buf, size_t count) { - int rc, contrast; + int rc = -ENXIO; char *endp; struct lcd_device *ld = to_lcd_device(cdev); + int contrast = simple_strtoul(buf, &endp, 0); + size_t size = endp - buf; - contrast = simple_strtoul(buf, &endp, 0); - if (*endp && !isspace(*endp)) + if (*endp && isspace(*endp)) + size++; + if (size != count) return -EINVAL; down(&ld->sem); @@ -81,8 +131,7 @@ static ssize_t lcd_store_contrast(struct class_device *cdev, const char *buf, si pr_debug("lcd: set contrast to %d\n", contrast); ld->props->set_contrast(ld, contrast); rc = count; - } else - rc = -ENXIO; + } up(&ld->sem); return rc; @@ -90,14 +139,12 @@ static ssize_t lcd_store_contrast(struct class_device *cdev, const char *buf, si static ssize_t lcd_show_max_contrast(struct class_device *cdev, char *buf) { - int rc; + int rc = -ENXIO; struct lcd_device *ld = to_lcd_device(cdev); down(&ld->sem); if (likely(ld->props)) rc = sprintf(buf, "%d\n", ld->props->max_contrast); - else - rc = -ENXIO; up(&ld->sem); return rc; @@ -121,35 +168,12 @@ static struct class lcd_class = { .store = _store, \ } -static struct class_device_attribute lcd_class_device_attributes[] = { +static const struct class_device_attribute lcd_class_device_attributes[] = { DECLARE_ATTR(power, 0644, lcd_show_power, lcd_store_power), DECLARE_ATTR(contrast, 0644, lcd_show_contrast, lcd_store_contrast), DECLARE_ATTR(max_contrast, 0444, lcd_show_max_contrast, NULL), }; -/* This callback gets called when something important happens inside a - * framebuffer driver. We're looking if that important event is blanking, - * and if it is, we're switching lcd power as well ... - */ -static int fb_notifier_callback(struct notifier_block *self, - unsigned long event, void *data) -{ - struct lcd_device *ld; - struct fb_event *evdata =(struct fb_event *)data; - - /* If we aren't interested in this event, skip it immediately ... */ - if (event != FB_EVENT_BLANK) - return 0; - - ld = container_of(self, struct lcd_device, fb_notif); - down(&ld->sem); - if (ld->props) - if (!ld->props->check_fb || ld->props->check_fb(evdata->info)) - ld->props->set_power(ld, *(int *)evdata->data); - up(&ld->sem); - return 0; -} - /** * lcd_device_register - register a new object of lcd_device class. * @name: the name of the new object(must be the same as the name of the @@ -186,10 +210,8 @@ error: kfree(new_ld); return ERR_PTR(rc); } - memset(&new_ld->fb_notif, 0, sizeof(new_ld->fb_notif)); - new_ld->fb_notif.notifier_call = fb_notifier_callback; + rc = lcd_register_fb(new_ld); - rc = fb_register_client(&new_ld->fb_notif); if (unlikely(rc)) goto error; @@ -232,9 +254,7 @@ void lcd_device_unregister(struct lcd_device *ld) down(&ld->sem); ld->props = NULL; up(&ld->sem); - - fb_unregister_client(&ld->fb_notif); - + lcd_unregister_fb(ld); class_device_unregister(&ld->class_dev); } EXPORT_SYMBOL(lcd_device_unregister);