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eeepc-wmi: support backlight power (bl_power) attribute 

Signed-off-by: Corentin Chary <corentincj@iksaif.net>
Signed-off-by: Matthew Garrett <mjg@redhat.com>
This commit is contained in:
Corentin Chary 2011-02-06 13:28:39 +01:00 committed by Matthew Garrett
parent 54c799a50f
commit b71872650f
1 changed files with 61 additions and 14 deletions
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75
drivers/platform/x86/eeepc-wmi.c
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@ -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");