diff options
| -rw-r--r-- | drivers/platform/x86/toshiba_acpi.c | 80 |
1 files changed, 56 insertions, 24 deletions
diff --git a/drivers/platform/x86/toshiba_acpi.c b/drivers/platform/x86/toshiba_acpi.c index 57787d87d9a4..1bb128bbcfc9 100644 --- a/drivers/platform/x86/toshiba_acpi.c +++ b/drivers/platform/x86/toshiba_acpi.c @@ -480,9 +480,8 @@ static const struct rfkill_ops toshiba_rfk_ops = { static struct proc_dir_entry *toshiba_proc_dir /*= 0*/ ; -static int get_lcd(struct backlight_device *bd) +static int __get_lcd_brightness(struct toshiba_acpi_dev *dev) { - struct toshiba_acpi_dev *dev = bl_get_data(bd); u32 hci_result; u32 value; @@ -493,6 +492,12 @@ static int get_lcd(struct backlight_device *bd) return -EIO; } +static int get_lcd_brightness(struct backlight_device *bd) +{ + struct toshiba_acpi_dev *dev = bl_get_data(bd); + return __get_lcd_brightness(dev); +} + static int lcd_proc_show(struct seq_file *m, void *v) { struct toshiba_acpi_dev *dev = m->private; @@ -501,7 +506,7 @@ static int lcd_proc_show(struct seq_file *m, void *v) if (!dev->backlight_dev) return -ENODEV; - value = get_lcd(dev->backlight_dev); + value = get_lcd_brightness(dev->backlight_dev); if (value >= 0) { seq_printf(m, "brightness: %d\n", value); seq_printf(m, "brightness_levels: %d\n", @@ -518,7 +523,7 @@ static int lcd_proc_open(struct inode *inode, struct file *file) return single_open(file, lcd_proc_show, PDE(inode)->data); } -static int set_lcd(struct toshiba_acpi_dev *dev, int value) +static int set_lcd_brightness(struct toshiba_acpi_dev *dev, int value) { u32 hci_result; @@ -530,7 +535,7 @@ static int set_lcd(struct toshiba_acpi_dev *dev, int value) static int set_lcd_status(struct backlight_device *bd) { struct toshiba_acpi_dev *dev = bl_get_data(bd); - return set_lcd(dev, bd->props.brightness); + return set_lcd_brightness(dev, bd->props.brightness); } static ssize_t lcd_proc_write(struct file *file, const char __user *buf, @@ -549,7 +554,7 @@ static ssize_t lcd_proc_write(struct file *file, const char __user *buf, if (sscanf(cmd, " brightness : %i", &value) == 1 && value >= 0 && value < HCI_LCD_BRIGHTNESS_LEVELS) { - ret = set_lcd(dev, value); + ret = set_lcd_brightness(dev, value); if (ret == 0) ret = count; } else { @@ -860,8 +865,8 @@ static void remove_toshiba_proc_entries(struct toshiba_acpi_dev *dev) } static const struct backlight_ops toshiba_backlight_data = { - .get_brightness = get_lcd, - .update_status = set_lcd_status, + .get_brightness = get_lcd_brightness, + .update_status = set_lcd_status, }; static bool toshiba_acpi_i8042_filter(unsigned char data, unsigned char str, @@ -1020,6 +1025,47 @@ static int __devinit toshiba_acpi_setup_keyboard(struct toshiba_acpi_dev *dev) return error; } +static int __devinit toshiba_acpi_setup_backlight(struct toshiba_acpi_dev *dev) +{ + struct backlight_properties props; + int brightness; + int ret; + + /* + * Some machines don't support the backlight methods at all, and + * others support it read-only. Either of these is pretty useless, + * so only register the backlight device if the backlight method + * supports both reads and writes. + */ + brightness = __get_lcd_brightness(dev); + if (brightness < 0) + return 0; + ret = set_lcd_brightness(dev, brightness); + if (ret) { + pr_debug("Backlight method is read-only, disabling backlight support\n"); + return 0; + } + + props.type = BACKLIGHT_PLATFORM; + props.max_brightness = HCI_LCD_BRIGHTNESS_LEVELS - 1; + memset(&props, 0, sizeof(props)); + + dev->backlight_dev = backlight_device_register("toshiba", + &dev->acpi_dev->dev, + dev, + &toshiba_backlight_data, + &props); + if (IS_ERR(dev->backlight_dev)) { + ret = PTR_ERR(dev->backlight_dev); + pr_err("Could not register toshiba backlight device\n"); + dev->backlight_dev = NULL; + return ret; + } + + dev->backlight_dev->props.brightness = brightness; + return 0; +} + static int toshiba_acpi_remove(struct acpi_device *acpi_dev, int type) { struct toshiba_acpi_dev *dev = acpi_driver_data(acpi_dev); @@ -1078,7 +1124,6 @@ static int __devinit toshiba_acpi_add(struct acpi_device *acpi_dev) u32 dummy; bool bt_present; int ret = 0; - struct backlight_properties props; if (toshiba_acpi) return -EBUSY; @@ -1104,22 +1149,9 @@ static int __devinit toshiba_acpi_add(struct acpi_device *acpi_dev) mutex_init(&dev->mutex); - memset(&props, 0, sizeof(props)); - props.type = BACKLIGHT_PLATFORM; - props.max_brightness = HCI_LCD_BRIGHTNESS_LEVELS - 1; - dev->backlight_dev = backlight_device_register("toshiba", - &acpi_dev->dev, - dev, - &toshiba_backlight_data, - &props); - if (IS_ERR(dev->backlight_dev)) { - ret = PTR_ERR(dev->backlight_dev); - - pr_err("Could not register toshiba backlight device\n"); - dev->backlight_dev = NULL; + ret = toshiba_acpi_setup_backlight(dev); + if (ret) goto error; - } - dev->backlight_dev->props.brightness = get_lcd(dev->backlight_dev); /* Register rfkill switch for Bluetooth */ if (hci_get_bt_present(dev, &bt_present) == HCI_SUCCESS && bt_present) { |