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| author | Russell King <rmk+kernel@arm.linux.org.uk> | 2010-02-25 22:10:38 +0000 |
|---|---|---|
| committer | Russell King <rmk+kernel@arm.linux.org.uk> | 2010-02-25 22:10:38 +0000 |
| commit | 9f33be2c3a80bdc2cc08342dd77fac87652e0548 (patch) | |
| tree | 7ad6e825427a15c5ec0fc15540abc0429d7f4bce /drivers/acpi/video.c | |
| parent | 2741ecb4ce5c2d430b5c44b0a169038338c21df5 (diff) | |
| parent | eed18b5fa4d297c681b00144e8c6942dd35d39a7 (diff) | |
| download | kernel_samsung_smdk4412-9f33be2c3a80bdc2cc08342dd77fac87652e0548.zip kernel_samsung_smdk4412-9f33be2c3a80bdc2cc08342dd77fac87652e0548.tar.gz kernel_samsung_smdk4412-9f33be2c3a80bdc2cc08342dd77fac87652e0548.tar.bz2 | |
Merge branches 'clks' and 'pnx' into devel
Diffstat (limited to 'drivers/acpi/video.c')
| -rw-r--r-- | drivers/acpi/video.c | 43 |
1 files changed, 43 insertions, 0 deletions
diff --git a/drivers/acpi/video.c b/drivers/acpi/video.c index 72e76b4..b765790 100644 --- a/drivers/acpi/video.c +++ b/drivers/acpi/video.c @@ -78,6 +78,13 @@ MODULE_LICENSE("GPL"); static int brightness_switch_enabled = 1; module_param(brightness_switch_enabled, bool, 0644); +/* + * By default, we don't allow duplicate ACPI video bus devices + * under the same VGA controller + */ +static int allow_duplicates; +module_param(allow_duplicates, bool, 0644); + static int register_count = 0; static int acpi_video_bus_add(struct acpi_device *device); static int acpi_video_bus_remove(struct acpi_device *device, int type); @@ -2239,11 +2246,47 @@ static int acpi_video_resume(struct acpi_device *device) return AE_OK; } +static acpi_status +acpi_video_bus_match(acpi_handle handle, u32 level, void *context, + void **return_value) +{ + struct acpi_device *device = context; + struct acpi_device *sibling; + int result; + + if (handle == device->handle) + return AE_CTRL_TERMINATE; + + result = acpi_bus_get_device(handle, &sibling); + if (result) + return AE_OK; + + if (!strcmp(acpi_device_name(sibling), ACPI_VIDEO_BUS_NAME)) + return AE_ALREADY_EXISTS; + + return AE_OK; +} + static int acpi_video_bus_add(struct acpi_device *device) { struct acpi_video_bus *video; struct input_dev *input; int error; + acpi_status status; + + status = acpi_walk_namespace(ACPI_TYPE_DEVICE, + device->parent->handle, 1, + acpi_video_bus_match, NULL, + device, NULL); + if (status == AE_ALREADY_EXISTS) { + printk(KERN_WARNING FW_BUG + "Duplicate ACPI video bus devices for the" + " same VGA controller, please try module " + "parameter \"video.allow_duplicates=1\"" + "if the current driver doesn't work.\n"); + if (!allow_duplicates) + return -ENODEV; + } video = kzalloc(sizeof(struct acpi_video_bus), GFP_KERNEL); if (!video) |