diff options
author | Corentin Chary <corentincj@iksaif.net> | 2011-02-06 13:28:39 +0100 |
---|---|---|
committer | Matthew Garrett <mjg@redhat.com> | 2011-03-28 06:05:18 -0400 |
commit | b71872650fe967eb0a38aa0d7dcbe9c60d160032 (patch) | |
tree | efaf18d28433d1cba20352538329c1d9bd8c2306 /drivers/platform/x86/eeepc-wmi.c | |
parent | 54c799a50f58285f5f6a93d87470cba1847943a3 (diff) |
eeepc-wmi: support backlight power (bl_power) attribute
Signed-off-by: Corentin Chary <corentincj@iksaif.net>
Signed-off-by: Matthew Garrett <mjg@redhat.com>
Diffstat (limited to 'drivers/platform/x86/eeepc-wmi.c')
-rw-r--r-- | drivers/platform/x86/eeepc-wmi.c | 75 |
1 files changed, 61 insertions, 14 deletions
diff --git a/drivers/platform/x86/eeepc-wmi.c b/drivers/platform/x86/eeepc-wmi.c index 75dd692d31ee..910eb00fb13e 100644 --- a/drivers/platform/x86/eeepc-wmi.c +++ b/drivers/platform/x86/eeepc-wmi.c @@ -73,13 +73,16 @@ MODULE_ALIAS("wmi:"EEEPC_WMI_MGMT_GUID); #define EEEPC_WMI_DEVID_BLUETOOTH 0x00010013 #define EEEPC_WMI_DEVID_WIMAX 0x00010017 #define EEEPC_WMI_DEVID_WWAN3G 0x00010019 -#define EEEPC_WMI_DEVID_BACKLIGHT 0x00050012 +#define EEEPC_WMI_DEVID_BACKLIGHT 0x00050011 +#define EEEPC_WMI_DEVID_BRIGHTNESS 0x00050012 #define EEEPC_WMI_DEVID_CAMERA 0x00060013 #define EEEPC_WMI_DEVID_CARDREADER 0x00080013 #define EEEPC_WMI_DEVID_TPDLED 0x00100011 #define EEEPC_WMI_DSTS_STATUS_BIT 0x00000001 #define EEEPC_WMI_DSTS_PRESENCE_BIT 0x00010000 +#define EEEPC_WMI_DSTS_BRIGHTNESS_MASK 0x000000FF +#define EEEPC_WMI_DSTS_MAX_BRIGTH_MASK 0x0000FF00 static bool hotplug_wireless; @@ -262,7 +265,7 @@ static acpi_status eeepc_wmi_set_devstate(u32 dev_id, u32 ctrl_param, } /* Helper for special devices with magic return codes */ -static int eeepc_wmi_get_devstate_simple(u32 dev_id) +static int eeepc_wmi_get_devstate_bits(u32 dev_id, u32 mask) { u32 retval = 0; acpi_status status; @@ -275,7 +278,12 @@ static int eeepc_wmi_get_devstate_simple(u32 dev_id) if (!(retval & EEEPC_WMI_DSTS_PRESENCE_BIT)) return -ENODEV; - return retval & EEEPC_WMI_DSTS_STATUS_BIT; + return retval & mask; +} + +static int eeepc_wmi_get_devstate_simple(u32 dev_id) +{ + return eeepc_wmi_get_devstate_bits(dev_id, EEEPC_WMI_DSTS_STATUS_BIT); } /* @@ -770,34 +778,53 @@ exit: /* * Backlight */ +static int read_backlight_power(void) +{ + int ret = eeepc_wmi_get_devstate_simple(EEEPC_WMI_DEVID_BACKLIGHT); + + if (ret < 0) + return ret; + + return ret ? FB_BLANK_UNBLANK : FB_BLANK_POWERDOWN; +} + static int read_brightness(struct backlight_device *bd) { u32 retval; acpi_status status; - status = eeepc_wmi_get_devstate(EEEPC_WMI_DEVID_BACKLIGHT, &retval); + status = eeepc_wmi_get_devstate(EEEPC_WMI_DEVID_BRIGHTNESS, &retval); if (ACPI_FAILURE(status)) - return -1; + return -EIO; else - return retval & 0xFF; + return retval & EEEPC_WMI_DSTS_BRIGHTNESS_MASK; } static int update_bl_status(struct backlight_device *bd) { - u32 ctrl_param; acpi_status status; + int power; ctrl_param = bd->props.brightness; - status = eeepc_wmi_set_devstate(EEEPC_WMI_DEVID_BACKLIGHT, + status = eeepc_wmi_set_devstate(EEEPC_WMI_DEVID_BRIGHTNESS, ctrl_param, NULL); if (ACPI_FAILURE(status)) - return -1; - else - return 0; + return -EIO; + + power = read_backlight_power(); + if (power != -ENODEV && bd->props.power != power) { + ctrl_param = !!(bd->props.power == FB_BLANK_UNBLANK); + status = eeepc_wmi_set_devstate(EEEPC_WMI_DEVID_BACKLIGHT, + ctrl_param, NULL); + + if (ACPI_FAILURE(status)) + return -EIO; + } + return 0; } static const struct backlight_ops eeepc_wmi_bl_ops = { @@ -827,9 +854,29 @@ static int eeepc_wmi_backlight_init(struct eeepc_wmi *eeepc) { struct backlight_device *bd; struct backlight_properties props; + int max; + int power; + + max = eeepc_wmi_get_devstate_bits(EEEPC_WMI_DEVID_BRIGHTNESS, + EEEPC_WMI_DSTS_MAX_BRIGTH_MASK); + power = read_backlight_power(); + + if (max < 0 && power < 0) { + /* Try to keep the original error */ + if (max == -ENODEV && power == -ENODEV) + return -ENODEV; + if (max != -ENODEV) + return max; + else + return power; + } + if (max == -ENODEV) + max = 0; + if (power == -ENODEV) + power = FB_BLANK_UNBLANK; memset(&props, 0, sizeof(struct backlight_properties)); - props.max_brightness = 15; + props.max_brightness = max; bd = backlight_device_register(EEEPC_WMI_FILE, &eeepc->platform_device->dev, eeepc, &eeepc_wmi_bl_ops, &props); @@ -841,7 +888,7 @@ static int eeepc_wmi_backlight_init(struct eeepc_wmi *eeepc) eeepc->backlight_device = bd; bd->props.brightness = read_brightness(bd); - bd->props.power = FB_BLANK_UNBLANK; + bd->props.power = power; backlight_update_status(bd); return 0; @@ -1202,7 +1249,7 @@ static int __init eeepc_wmi_add(struct platform_device *pdev) if (!acpi_video_backlight_support()) { err = eeepc_wmi_backlight_init(eeepc); - if (err) + if (err && err != -ENODEV) goto fail_backlight; } else pr_info("Backlight controlled by ACPI video driver\n"); |