ACPI video hotkey: export missing ACPI video hotkey events via input layer

Signed-off-by: Yu Luming <luming.yu@intel.com>
Signed-off-by: Zhang Rui <rui.zhang@intel.com>
Signed-off-by: Len Brown <len.brown@intel.com>

1 files changed, 88 insertions, 1 deletions

diff --git a/drivers/acpi/video.c b/drivers/acpi/video.c
index 8efdea587ae3..d727d2c715df 100644
--- a/drivers/acpi/video.c
+++ b/drivers/acpi/video.c
@@ -31,7 +31,7 @@
 #include <linux/list.h>
 #include <linux/proc_fs.h>
 #include <linux/seq_file.h>
-
+#include <linux/input.h>
 #include <linux/backlight.h>
 #include <linux/video_output.h>
 #include <asm/uaccess.h>
@@ -138,6 +138,8 @@ struct acpi_video_bus {
         struct semaphore sem;
         struct list_head video_device_list;
         struct proc_dir_entry *dir;
+        struct input_dev *input;
+        char phys[32];  /* for input device */
 };
 
 struct acpi_video_device_flags {
@@ -1764,6 +1766,9 @@ static void acpi_video_bus_notify(acpi_handle handle, u32 event, void *data)
 {
         struct acpi_video_bus *video = data;
         struct acpi_device *device = NULL;
+        struct input_dev *input;
+        int keycode;
+
 
         printk("video bus notify\n");
 
@@ -1771,11 +1776,13 @@ static void acpi_video_bus_notify(acpi_handle handle, u32 event, void *data)
                 return;
 
         device = video->device;
+        input = video->input;
 
         switch (event) {
         case ACPI_VIDEO_NOTIFY_SWITCH:  /* User requested a switch,
                                          * most likely via hotkey. */
                 acpi_bus_generate_event(device, event, 0);
+                keycode = KEY_SWITCHVIDEOMODE;
                 break;
 
         case ACPI_VIDEO_NOTIFY_PROBE:   /* User plugged in or removed a video
@@ -1784,21 +1791,37 @@ static void acpi_video_bus_notify(acpi_handle handle, u32 event, void *data)
                 acpi_video_device_rebind(video);
                 acpi_video_switch_output(video, event);
                 acpi_bus_generate_event(device, event, 0);
+                keycode = KEY_SWITCHVIDEOMODE;
                 break;
 
         case ACPI_VIDEO_NOTIFY_CYCLE:   /* Cycle Display output hotkey pressed. */
+                acpi_video_switch_output(video, event);
+                acpi_bus_generate_event(device, event, 0);
+                keycode = KEY_SWITCHVIDEOMODE;
+                break;
         case ACPI_VIDEO_NOTIFY_NEXT_OUTPUT:     /* Next Display output hotkey pressed. */
+                acpi_video_switch_output(video, event);
+                acpi_bus_generate_event(device, event, 0);
+                keycode = KEY_VIDEO_NEXT;
+                break;
         case ACPI_VIDEO_NOTIFY_PREV_OUTPUT:     /* previous Display output hotkey pressed. */
                 acpi_video_switch_output(video, event);
                 acpi_bus_generate_event(device, event, 0);
+                keycode = KEY_VIDEO_PREV;
                 break;
 
         default:
+                keycode = KEY_UNKNOWN;
                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
                                   "Unsupported event [0x%x]\n", event));
                 break;
         }
 
+        input_report_key(input, keycode, 1);
+        input_sync(input);
+        input_report_key(input, keycode, 0);
+        input_sync(input);
+
         return;
 }
 
@@ -1806,26 +1829,55 @@ static void acpi_video_device_notify(acpi_handle handle, u32 event, void *data)
 {
         struct acpi_video_device *video_device = data;
         struct acpi_device *device = NULL;
+        struct acpi_video_bus *bus;
+        struct input_dev *input;
+        int keycode;
 
         if (!video_device)
                 return;
 
         device = video_device->dev;
+        bus = video_device->video;
+        input = bus->input;
 
         switch (event) {
         case ACPI_VIDEO_NOTIFY_CYCLE_BRIGHTNESS:        /* Cycle brightness */
+                acpi_video_switch_brightness(video_device, event);
+                acpi_bus_generate_event(device, event, 0);
+                keycode = KEY_BRIGHTNESS_CYCLE;
+                break;
         case ACPI_VIDEO_NOTIFY_INC_BRIGHTNESS:  /* Increase brightness */
+                acpi_video_switch_brightness(video_device, event);
+                acpi_bus_generate_event(device, event, 0);
+                keycode = KEY_BRIGHTNESSUP;
+                break;
         case ACPI_VIDEO_NOTIFY_DEC_BRIGHTNESS:  /* Decrease brightness */
+                acpi_video_switch_brightness(video_device, event);
+                acpi_bus_generate_event(device, event, 0);
+                keycode = KEY_BRIGHTNESSDOWN;
+                break;
         case ACPI_VIDEO_NOTIFY_ZERO_BRIGHTNESS: /* zero brightnesss */
+                acpi_video_switch_brightness(video_device, event);
+                acpi_bus_generate_event(device, event, 0);
+                keycode = KEY_BRIGHTNESS_ZERO;
+                break;
         case ACPI_VIDEO_NOTIFY_DISPLAY_OFF:     /* display device off */
                 acpi_video_switch_brightness(video_device, event);
                 acpi_bus_generate_event(device, event, 0);
+                keycode = KEY_DISPLAY_OFF;
                 break;
         default:
+                keycode = KEY_UNKNOWN;
                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
                                   "Unsupported event [0x%x]\n", event));
                 break;
         }
+
+        input_report_key(input, keycode, 1);
+        input_sync(input);
+        input_report_key(input, keycode, 0);
+        input_sync(input);
+
         return;
 }
 
@@ -1834,6 +1886,7 @@ static int acpi_video_bus_add(struct acpi_device *device)
         int result = 0;
         acpi_status status = 0;
         struct acpi_video_bus *video = NULL;
+        struct input_dev *input;
 
 
         if (!device)
@@ -1877,6 +1930,39 @@ static int acpi_video_bus_add(struct acpi_device *device)
                 goto end;
         }
 
+
+        video->input = input = input_allocate_device();
+
+        snprintf(video->phys, sizeof(video->phys),
+                "%s/video/input0", acpi_device_hid(video->device));
+
+        input->name = acpi_device_name(video->device);
+        input->phys = video->phys;
+        input->id.bustype = BUS_HOST;
+        input->id.product = 0x06;
+        input->evbit[0] = BIT(EV_KEY);
+        set_bit(KEY_SWITCHVIDEOMODE, input->keybit);
+        set_bit(KEY_VIDEO_NEXT, input->keybit);
+        set_bit(KEY_VIDEO_PREV, input->keybit);
+        set_bit(KEY_BRIGHTNESS_CYCLE, input->keybit);
+        set_bit(KEY_BRIGHTNESSUP, input->keybit);
+        set_bit(KEY_BRIGHTNESSDOWN, input->keybit);
+        set_bit(KEY_BRIGHTNESS_ZERO, input->keybit);
+        set_bit(KEY_DISPLAY_OFF, input->keybit);
+        set_bit(KEY_UNKNOWN, input->keybit);
+        result = input_register_device(input);
+        if (result) {
+                acpi_remove_notify_handler(video->device->handle,
+                                                ACPI_DEVICE_NOTIFY,
+                                                acpi_video_bus_notify);
+                acpi_video_bus_stop_devices(video);
+                acpi_video_bus_put_devices(video);
+                kfree(video->attached_array);
+                acpi_video_bus_remove_fs(device);
+                goto end;
+        }
+
+
         printk(KERN_INFO PREFIX "%s [%s] (multi-head: %s  rom: %s  post: %s)\n",
                ACPI_VIDEO_DEVICE_NAME, acpi_device_bid(device),
                video->flags.multihead ? "yes" : "no",
@@ -1910,6 +1996,7 @@ static int acpi_video_bus_remove(struct acpi_device *device, int type)
         acpi_video_bus_put_devices(video);
         acpi_video_bus_remove_fs(device);
 
+        input_unregister_device(video->input);
         kfree(video->attached_array);
         kfree(video);