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Diffstat (limited to 'drivers/acpi/acpi_video.c')
-rw-r--r--drivers/acpi/acpi_video.c76
1 files changed, 61 insertions, 15 deletions
diff --git a/drivers/acpi/acpi_video.c b/drivers/acpi/acpi_video.c
index 3405f7a41e25..06a006ff89b0 100644
--- a/drivers/acpi/acpi_video.c
+++ b/drivers/acpi/acpi_video.c
@@ -77,14 +77,21 @@ module_param(allow_duplicates, bool, 0644);
static int disable_backlight_sysfs_if = -1;
module_param(disable_backlight_sysfs_if, int, 0444);
+#define REPORT_OUTPUT_KEY_EVENTS 0x01
+#define REPORT_BRIGHTNESS_KEY_EVENTS 0x02
+static int report_key_events = -1;
+module_param(report_key_events, int, 0644);
+MODULE_PARM_DESC(report_key_events,
+ "0: none, 1: output changes, 2: brightness changes, 3: all");
+
static bool device_id_scheme = false;
module_param(device_id_scheme, bool, 0444);
static bool only_lcd = false;
module_param(only_lcd, bool, 0444);
-static int register_count;
-static DEFINE_MUTEX(register_count_mutex);
+static DECLARE_COMPLETION(register_done);
+static DEFINE_MUTEX(register_done_mutex);
static struct mutex video_list_lock;
static struct list_head video_bus_head;
static int acpi_video_bus_add(struct acpi_device *device);
@@ -412,6 +419,13 @@ static int video_enable_only_lcd(const struct dmi_system_id *d)
return 0;
}
+static int video_set_report_key_events(const struct dmi_system_id *id)
+{
+ if (report_key_events == -1)
+ report_key_events = (uintptr_t)id->driver_data;
+ return 0;
+}
+
static struct dmi_system_id video_dmi_table[] = {
/*
* Broken _BQC workaround http://bugzilla.kernel.org/show_bug.cgi?id=13121
@@ -500,6 +514,24 @@ static struct dmi_system_id video_dmi_table[] = {
DMI_MATCH(DMI_PRODUCT_NAME, "ESPRIMO Mobile M9410"),
},
},
+ /*
+ * Some machines report wrong key events on the acpi-bus, suppress
+ * key event reporting on these. Note this is only intended to work
+ * around events which are plain wrong. In some cases we get double
+ * events, in this case acpi-video is considered the canonical source
+ * and the events from the other source should be filtered. E.g.
+ * by calling acpi_video_handles_brightness_key_presses() from the
+ * vendor acpi/wmi driver or by using /lib/udev/hwdb.d/60-keyboard.hwdb
+ */
+ {
+ .callback = video_set_report_key_events,
+ .driver_data = (void *)((uintptr_t)REPORT_OUTPUT_KEY_EVENTS),
+ .ident = "Dell Vostro V131",
+ .matches = {
+ DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
+ DMI_MATCH(DMI_PRODUCT_NAME, "Vostro V131"),
+ },
+ },
{}
};
@@ -1480,7 +1512,7 @@ static void acpi_video_bus_notify(struct acpi_device *device, u32 event)
/* Something vetoed the keypress. */
keycode = 0;
- if (keycode) {
+ if (keycode && (report_key_events & REPORT_OUTPUT_KEY_EVENTS)) {
input_report_key(input, keycode, 1);
input_sync(input);
input_report_key(input, keycode, 0);
@@ -1544,7 +1576,7 @@ static void acpi_video_device_notify(acpi_handle handle, u32 event, void *data)
acpi_notifier_call_chain(device, event, 0);
- if (keycode) {
+ if (keycode && (report_key_events & REPORT_BRIGHTNESS_KEY_EVENTS)) {
input_report_key(input, keycode, 1);
input_sync(input);
input_report_key(input, keycode, 0);
@@ -2017,8 +2049,8 @@ int acpi_video_register(void)
{
int ret = 0;
- mutex_lock(&register_count_mutex);
- if (register_count) {
+ mutex_lock(&register_done_mutex);
+ if (completion_done(&register_done)) {
/*
* if the function of acpi_video_register is already called,
* don't register the acpi_vide_bus again and return no error.
@@ -2039,22 +2071,22 @@ int acpi_video_register(void)
* When the acpi_video_bus is loaded successfully, increase
* the counter reference.
*/
- register_count = 1;
+ complete(&register_done);
leave:
- mutex_unlock(&register_count_mutex);
+ mutex_unlock(&register_done_mutex);
return ret;
}
EXPORT_SYMBOL(acpi_video_register);
void acpi_video_unregister(void)
{
- mutex_lock(&register_count_mutex);
- if (register_count) {
+ mutex_lock(&register_done_mutex);
+ if (completion_done(&register_done)) {
acpi_bus_unregister_driver(&acpi_video_bus);
- register_count = 0;
+ reinit_completion(&register_done);
}
- mutex_unlock(&register_count_mutex);
+ mutex_unlock(&register_done_mutex);
}
EXPORT_SYMBOL(acpi_video_unregister);
@@ -2062,15 +2094,29 @@ void acpi_video_unregister_backlight(void)
{
struct acpi_video_bus *video;
- mutex_lock(&register_count_mutex);
- if (register_count) {
+ mutex_lock(&register_done_mutex);
+ if (completion_done(&register_done)) {
mutex_lock(&video_list_lock);
list_for_each_entry(video, &video_bus_head, entry)
acpi_video_bus_unregister_backlight(video);
mutex_unlock(&video_list_lock);
}
- mutex_unlock(&register_count_mutex);
+ mutex_unlock(&register_done_mutex);
+}
+
+bool acpi_video_handles_brightness_key_presses(void)
+{
+ bool have_video_busses;
+
+ wait_for_completion(&register_done);
+ mutex_lock(&video_list_lock);
+ have_video_busses = !list_empty(&video_bus_head);
+ mutex_unlock(&video_list_lock);
+
+ return have_video_busses &&
+ (report_key_events & REPORT_BRIGHTNESS_KEY_EVENTS);
}
+EXPORT_SYMBOL(acpi_video_handles_brightness_key_presses);
/*
* This is kind of nasty. Hardware using Intel chipsets may require