ACPI video: dmi check for broken _BQC on Acer Aspire 5720

[safe/jmp/linux-2.6] / drivers / acpi / video.c

diff --git a/drivers/acpi/video.c b/drivers/acpi/video.c
index d51d6f0..7e8ee49 100644 (file)
--- a/drivers/acpi/video.c
+++ b/drivers/acpi/video.c
@@ -79,6 +79,7 @@ module_param(brightness_switch_enabled, bool, 0644);
 static int acpi_video_bus_add(struct acpi_device *device);
 static int acpi_video_bus_remove(struct acpi_device *device, int type);
 static int acpi_video_resume(struct acpi_device *device);
+static void acpi_video_bus_notify(struct acpi_device *device, u32 event);
 
 static const struct acpi_device_id video_device_ids[] = {
        {ACPI_VIDEO_HID, 0},
@@ -94,6 +95,7 @@ static struct acpi_driver acpi_video_bus = {
                .add = acpi_video_bus_add,
                .remove = acpi_video_bus_remove,
                .resume = acpi_video_resume,
+               .notify = acpi_video_bus_notify,
                },
 };
 
@@ -536,6 +538,33 @@ acpi_video_device_lcd_set_level(struct acpi_video_device *device, int level)
        return -EINVAL;
 }
 
+/*
+ * For some buggy _BQC methods, we need to add a constant value to
+ * the _BQC return value to get the actual current brightness level
+ */
+
+static int bqc_offset_aml_bug_workaround;
+static int __init video_set_bqc_offset(const struct dmi_system_id *d)
+{
+       bqc_offset_aml_bug_workaround = 9;
+       return 0;
+}
+
+static struct dmi_system_id video_dmi_table[] __initdata = {
+       /*
+        * Broken _BQC workaround http://bugzilla.kernel.org/show_bug.cgi?id=13121
+        */
+       {
+        .callback = video_set_bqc_offset,
+        .ident = "Acer Aspire 5720",
+        .matches = {
+               DMI_MATCH(DMI_BOARD_VENDOR, "Acer"),
+               DMI_MATCH(DMI_PRODUCT_NAME, "Aspire 5720"),
+               },
+       },
+       {}
+};
+
 static int
 acpi_video_device_lcd_get_level_current(struct acpi_video_device *device,
                                        unsigned long long *level)
@@ -555,6 +584,7 @@ acpi_video_device_lcd_get_level_current(struct acpi_video_device *device,
                                *level = device->brightness->levels[*level + 2];
 
                        }
+                       *level += bqc_offset_aml_bug_workaround;
                        device->brightness->curr = *level;
                        return 0;
                } else {
@@ -1256,8 +1286,6 @@ static int acpi_video_device_add_fs(struct acpi_device *device)
        if (!device_dir)
                return -ENOMEM;
 
-       device_dir->owner = THIS_MODULE;
-
        /* 'info' [R] */
        entry = proc_create_data("info", S_IRUGO, device_dir,
                        &acpi_video_device_info_fops, acpi_driver_data(device));
@@ -1531,8 +1559,6 @@ static int acpi_video_bus_add_fs(struct acpi_device *device)
        if (!device_dir)
                return -ENOMEM;
 
-       device_dir->owner = THIS_MODULE;
-
        /* 'info' [R] */
        entry = proc_create_data("info", S_IRUGO, device_dir,
                                 &acpi_video_bus_info_fops,
@@ -1990,17 +2016,15 @@ static int acpi_video_bus_stop_devices(struct acpi_video_bus *video)
        return acpi_video_bus_DOS(video, 0, 1);
 }
 
-static void acpi_video_bus_notify(acpi_handle handle, u32 event, void *data)
+static void acpi_video_bus_notify(struct acpi_device *device, u32 event)
 {
-       struct acpi_video_bus *video = data;
-       struct acpi_device *device = NULL;
+       struct acpi_video_bus *video = acpi_driver_data(device);
        struct input_dev *input;
        int keycode;
 
        if (!video)
                return;
 
-       device = video->device;
        input = video->input;
 
        switch (event) {
@@ -2131,7 +2155,6 @@ static int acpi_video_resume(struct acpi_device *device)
 
 static int acpi_video_bus_add(struct acpi_device *device)
 {
-       acpi_status status;
        struct acpi_video_bus *video;
        struct input_dev *input;
        int error;
@@ -2173,20 +2196,10 @@ static int acpi_video_bus_add(struct acpi_device *device)
        acpi_video_bus_get_devices(video, device);
        acpi_video_bus_start_devices(video);
 
-       status = acpi_install_notify_handler(device->handle,
-                                            ACPI_DEVICE_NOTIFY,
-                                            acpi_video_bus_notify, video);
-       if (ACPI_FAILURE(status)) {
-               printk(KERN_ERR PREFIX
-                                 "Error installing notify handler\n");
-               error = -ENODEV;
-               goto err_stop_video;
-       }
-
        video->input = input = input_allocate_device();
        if (!input) {
                error = -ENOMEM;
-               goto err_uninstall_notify;
+               goto err_stop_video;
        }
 
        snprintf(video->phys, sizeof(video->phys),
@@ -2222,9 +2235,6 @@ static int acpi_video_bus_add(struct acpi_device *device)
 
  err_free_input_dev:
        input_free_device(input);
- err_uninstall_notify:
-       acpi_remove_notify_handler(device->handle, ACPI_DEVICE_NOTIFY,
-                                  acpi_video_bus_notify);
  err_stop_video:
        acpi_video_bus_stop_devices(video);
        acpi_video_bus_put_devices(video);
@@ -2239,7 +2249,6 @@ static int acpi_video_bus_add(struct acpi_device *device)
 
 static int acpi_video_bus_remove(struct acpi_device *device, int type)
 {
-       acpi_status status = 0;
        struct acpi_video_bus *video = NULL;
 
 
@@ -2249,11 +2258,6 @@ static int acpi_video_bus_remove(struct acpi_device *device, int type)
        video = acpi_driver_data(device);
 
        acpi_video_bus_stop_devices(video);
-
-       status = acpi_remove_notify_handler(video->device->handle,
-                                           ACPI_DEVICE_NOTIFY,
-                                           acpi_video_bus_notify);
-
        acpi_video_bus_put_devices(video);
        acpi_video_bus_remove_fs(device);
 
@@ -2291,7 +2295,6 @@ int acpi_video_register(void)
        acpi_video_dir = proc_mkdir(ACPI_VIDEO_CLASS, acpi_root_dir);
        if (!acpi_video_dir)
                return -ENODEV;
-       acpi_video_dir->owner = THIS_MODULE;
 
        result = acpi_bus_register_driver(&acpi_video_bus);
        if (result < 0) {
@@ -2312,6 +2315,8 @@ EXPORT_SYMBOL(acpi_video_register);
 
 static int __init acpi_video_init(void)
 {
+       dmi_check_system(video_dmi_table);
+
        if (intel_opregion_present())
                return 0;