Merge branch 'video' into release
[linux-2.6.git] / drivers / acpi / video.c
index 5259d50..100c8ee 100644 (file)
@@ -37,6 +37,8 @@
 #include <linux/thermal.h>
 #include <linux/video_output.h>
 #include <linux/sort.h>
+#include <linux/pci.h>
+#include <linux/pci_ids.h>
 #include <asm/uaccess.h>
 
 #include <acpi/acpi_bus.h>
@@ -162,16 +164,26 @@ struct acpi_video_device_cap {
        u8 _BCL:1;              /*Query list of brightness control levels supported */
        u8 _BCM:1;              /*Set the brightness level */
        u8 _BQC:1;              /* Get current brightness level */
+       u8 _BCQ:1;              /* Some buggy BIOS uses _BCQ instead of _BQC */
        u8 _DDC:1;              /*Return the EDID for this device */
        u8 _DCS:1;              /*Return status of output device */
        u8 _DGS:1;              /*Query graphics state */
        u8 _DSS:1;              /*Device state set */
 };
 
+struct acpi_video_brightness_flags {
+       u8 _BCL_no_ac_battery_levels:1; /* no AC/Battery levels in _BCL */
+       u8 _BCL_reversed:1;             /* _BCL package is in a reversed order*/
+       u8 _BCL_use_index:1;            /* levels in _BCL are index values */
+       u8 _BCM_use_index:1;            /* input of _BCM is an index value */
+       u8 _BQC_use_index:1;            /* _BQC returns an index value */
+};
+
 struct acpi_video_device_brightness {
        int curr;
        int count;
        int *levels;
+       struct acpi_video_brightness_flags flags;
 };
 
 struct acpi_video_device {
@@ -294,7 +306,7 @@ static int acpi_video_device_lcd_get_level_current(
                        unsigned long long *level);
 static int acpi_video_get_next_level(struct acpi_video_device *device,
                                     u32 level_current, u32 event);
-static void acpi_video_switch_brightness(struct acpi_video_device *device,
+static int acpi_video_switch_brightness(struct acpi_video_device *device,
                                         int event);
 static int acpi_video_device_get_state(struct acpi_video_device *device,
                            unsigned long long *state);
@@ -308,7 +320,9 @@ static int acpi_video_get_brightness(struct backlight_device *bd)
        int i;
        struct acpi_video_device *vd =
                (struct acpi_video_device *)bl_get_data(bd);
-       acpi_video_device_lcd_get_level_current(vd, &cur_level);
+
+       if (acpi_video_device_lcd_get_level_current(vd, &cur_level))
+               return -EINVAL;
        for (i = 2; i < vd->brightness->count; i++) {
                if (vd->brightness->levels[i] == cur_level)
                        /* The first two entries are special - see page 575
@@ -320,12 +334,12 @@ static int acpi_video_get_brightness(struct backlight_device *bd)
 
 static int acpi_video_set_brightness(struct backlight_device *bd)
 {
-       int request_level = bd->props.brightness+2;
+       int request_level = bd->props.brightness + 2;
        struct acpi_video_device *vd =
                (struct acpi_video_device *)bl_get_data(bd);
-       acpi_video_device_lcd_set_level(vd,
-                                       vd->brightness->levels[request_level]);
-       return 0;
+
+       return acpi_video_device_lcd_set_level(vd,
+                               vd->brightness->levels[request_level]);
 }
 
 static struct backlight_ops acpi_backlight_ops = {
@@ -376,7 +390,8 @@ static int video_get_cur_state(struct thermal_cooling_device *cdev, unsigned
        unsigned long long level;
        int offset;
 
-       acpi_video_device_lcd_get_level_current(video, &level);
+       if (acpi_video_device_lcd_get_level_current(video, &level))
+               return -EINVAL;
        for (offset = 2; offset < video->brightness->count; offset++)
                if (level == video->brightness->levels[offset]) {
                        *state = video->brightness->count - offset - 1;
@@ -483,34 +498,68 @@ acpi_video_device_lcd_query_levels(struct acpi_video_device *device,
 static int
 acpi_video_device_lcd_set_level(struct acpi_video_device *device, int level)
 {
-       int status = AE_OK;
+       int status;
        union acpi_object arg0 = { ACPI_TYPE_INTEGER };
        struct acpi_object_list args = { 1, &arg0 };
        int state;
 
-
        arg0.integer.value = level;
 
-       if (device->cap._BCM)
-               status = acpi_evaluate_object(device->dev->handle, "_BCM",
-                                             &args, NULL);
+       status = acpi_evaluate_object(device->dev->handle, "_BCM",
+                                     &args, NULL);
+       if (ACPI_FAILURE(status)) {
+               ACPI_ERROR((AE_INFO, "Evaluating _BCM failed"));
+               return -EIO;
+       }
+
        device->brightness->curr = level;
        for (state = 2; state < device->brightness->count; state++)
-               if (level == device->brightness->levels[state])
-                       device->backlight->props.brightness = state - 2;
+               if (level == device->brightness->levels[state]) {
+                       if (device->backlight)
+                               device->backlight->props.brightness = state - 2;
+                       return 0;
+               }
 
-       return status;
+       ACPI_ERROR((AE_INFO, "Current brightness invalid"));
+       return -EINVAL;
 }
 
 static int
 acpi_video_device_lcd_get_level_current(struct acpi_video_device *device,
                                        unsigned long long *level)
 {
-       if (device->cap._BQC)
-               return acpi_evaluate_integer(device->dev->handle, "_BQC", NULL,
-                                            level);
+       acpi_status status = AE_OK;
+
+       if (device->cap._BQC || device->cap._BCQ) {
+               char *buf = device->cap._BQC ? "_BQC" : "_BCQ";
+
+               status = acpi_evaluate_integer(device->dev->handle, buf,
+                                               NULL, level);
+               if (ACPI_SUCCESS(status)) {
+                       if (device->brightness->flags._BQC_use_index) {
+                               if (device->brightness->flags._BCL_reversed)
+                                       *level = device->brightness->count
+                                                                - 3 - (*level);
+                               *level = device->brightness->levels[*level + 2];
+
+                       }
+                       device->brightness->curr = *level;
+                       return 0;
+               } else {
+                       /* Fixme:
+                        * should we return an error or ignore this failure?
+                        * dev->brightness->curr is a cached value which stores
+                        * the correct current backlight level in most cases.
+                        * ACPI video backlight still works w/ buggy _BQC.
+                        * http://bugzilla.kernel.org/show_bug.cgi?id=12233
+                        */
+                       ACPI_WARNING((AE_INFO, "Evaluating %s failed", buf));
+                       device->cap._BQC = device->cap._BCQ = 0;
+               }
+       }
+
        *level = device->brightness->curr;
-       return AE_OK;
+       return 0;
 }
 
 static int
@@ -659,9 +708,11 @@ static int
 acpi_video_init_brightness(struct acpi_video_device *device)
 {
        union acpi_object *obj = NULL;
-       int i, max_level = 0, count = 0;
+       int i, max_level = 0, count = 0, level_ac_battery = 0;
+       unsigned long long level, level_old;
        union acpi_object *o;
        struct acpi_video_device_brightness *br = NULL;
+       int result = -EINVAL;
 
        if (!ACPI_SUCCESS(acpi_video_device_lcd_query_levels(device, &obj))) {
                ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Could not query available "
@@ -675,13 +726,16 @@ acpi_video_init_brightness(struct acpi_video_device *device)
        br = kzalloc(sizeof(*br), GFP_KERNEL);
        if (!br) {
                printk(KERN_ERR "can't allocate memory\n");
+               result = -ENOMEM;
                goto out;
        }
 
-       br->levels = kmalloc(obj->package.count * sizeof *(br->levels),
+       br->levels = kmalloc((obj->package.count + 2) * sizeof *(br->levels),
                                GFP_KERNEL);
-       if (!br->levels)
+       if (!br->levels) {
+               result = -ENOMEM;
                goto out_free;
+       }
 
        for (i = 0; i < obj->package.count; i++) {
                o = (union acpi_object *)&obj->package.elements[i];
@@ -696,18 +750,86 @@ acpi_video_init_brightness(struct acpi_video_device *device)
                count++;
        }
 
-       /* don't sort the first two brightness levels */
-       sort(&br->levels[2], count - 2, sizeof(br->levels[2]),
-               acpi_video_cmp_level, NULL);
-
-       if (count < 2)
-               goto out_free_levels;
+       /*
+        * some buggy BIOS don't export the levels
+        * when machine is on AC/Battery in _BCL package.
+        * In this case, the first two elements in _BCL packages
+        * are also supported brightness levels that OS should take care of.
+        */
+       for (i = 2; i < count; i++)
+               if (br->levels[i] == br->levels[0] ||
+                   br->levels[i] == br->levels[1])
+                       level_ac_battery++;
+
+       if (level_ac_battery < 2) {
+               level_ac_battery = 2 - level_ac_battery;
+               br->flags._BCL_no_ac_battery_levels = 1;
+               for (i = (count - 1 + level_ac_battery); i >= 2; i--)
+                       br->levels[i] = br->levels[i - level_ac_battery];
+               count += level_ac_battery;
+       } else if (level_ac_battery > 2)
+               ACPI_ERROR((AE_INFO, "Too many duplicates in _BCL package\n"));
+
+       /* Check if the _BCL package is in a reversed order */
+       if (max_level == br->levels[2]) {
+               br->flags._BCL_reversed = 1;
+               sort(&br->levels[2], count - 2, sizeof(br->levels[2]),
+                       acpi_video_cmp_level, NULL);
+       } else if (max_level != br->levels[count - 1])
+               ACPI_ERROR((AE_INFO,
+                           "Found unordered _BCL package\n"));
 
        br->count = count;
        device->brightness = br;
-       ACPI_DEBUG_PRINT((ACPI_DB_INFO, "found %d brightness levels\n", count));
+
+       /* Check the input/output of _BQC/_BCL/_BCM */
+       if ((max_level < 100) && (max_level <= (count - 2)))
+               br->flags._BCL_use_index = 1;
+
+       /*
+        * _BCM is always consistent with _BCL,
+        * at least for all the laptops we have ever seen.
+        */
+       br->flags._BCM_use_index = br->flags._BCL_use_index;
+
+       /* _BQC uses INDEX while _BCL uses VALUE in some laptops */
+       br->curr = max_level;
+       result = acpi_video_device_lcd_get_level_current(device, &level_old);
+       if (result)
+               goto out_free_levels;
+
+       result = acpi_video_device_lcd_set_level(device, br->curr);
+       if (result)
+               goto out_free_levels;
+
+       result = acpi_video_device_lcd_get_level_current(device, &level);
+       if (result)
+               goto out_free_levels;
+
+       if ((level != level_old) && !br->flags._BCM_use_index) {
+               /* Note:
+                * This piece of code does not work correctly if the current
+                * brightness levels is 0.
+                * But I guess boxes that boot with such a dark screen are rare
+                * and no more code is needed to cover this specifial case.
+                */
+
+               if (level_ac_battery != 2) {
+                       /*
+                        * For now, we don't support the _BCL like this:
+                        * 16, 15, 0, 1, 2, 3, ..., 14, 15, 16
+                        * because we may mess up the index returned by _BQC.
+                        * Plus: we have not got a box like this.
+                        */
+                       ACPI_ERROR((AE_INFO, "_BCL not supported\n"));
+               }
+               br->flags._BQC_use_index = 1;
+       }
+
+       ACPI_DEBUG_PRINT((ACPI_DB_INFO,
+                         "found %d brightness levels\n", count - 2));
        kfree(obj);
-       return max_level;
+       return result;
 
 out_free_levels:
        kfree(br->levels);
@@ -716,7 +838,7 @@ out_free:
 out:
        device->brightness = NULL;
        kfree(obj);
-       return 0;
+       return result;
 }
 
 /*
@@ -733,7 +855,6 @@ out:
 static void acpi_video_device_find_cap(struct acpi_video_device *device)
 {
        acpi_handle h_dummy1;
-       u32 max_level = 0;
 
 
        memset(&device->cap, 0, sizeof(device->cap));
@@ -749,6 +870,12 @@ static void acpi_video_device_find_cap(struct acpi_video_device *device)
        }
        if (ACPI_SUCCESS(acpi_get_handle(device->dev->handle,"_BQC",&h_dummy1)))
                device->cap._BQC = 1;
+       else if (ACPI_SUCCESS(acpi_get_handle(device->dev->handle, "_BCQ",
+                               &h_dummy1))) {
+               printk(KERN_WARNING FW_BUG "_BCQ is used instead of _BQC\n");
+               device->cap._BCQ = 1;
+       }
+
        if (ACPI_SUCCESS(acpi_get_handle(device->dev->handle, "_DDC", &h_dummy1))) {
                device->cap._DDC = 1;
        }
@@ -762,13 +889,14 @@ static void acpi_video_device_find_cap(struct acpi_video_device *device)
                device->cap._DSS = 1;
        }
 
-       if (acpi_video_backlight_support())
-               max_level = acpi_video_init_brightness(device);
-
-       if (device->cap._BCL && device->cap._BCM && max_level > 0) {
+       if (acpi_video_backlight_support()) {
                int result;
                static int count = 0;
                char *name;
+
+               result = acpi_video_init_brightness(device);
+               if (result)
+                       return;
                name = kzalloc(MAX_NAME_LEN, GFP_KERNEL);
                if (!name)
                        return;
@@ -777,18 +905,6 @@ static void acpi_video_device_find_cap(struct acpi_video_device *device)
                device->backlight = backlight_device_register(name,
                        NULL, device, &acpi_backlight_ops);
                device->backlight->props.max_brightness = device->brightness->count-3;
-               /*
-                * If there exists the _BQC object, the _BQC object will be
-                * called to get the current backlight brightness. Otherwise
-                * the brightness will be set to the maximum.
-                */
-               if (device->cap._BQC)
-                       device->backlight->props.brightness =
-                               acpi_video_get_brightness(device->backlight);
-               else
-                       device->backlight->props.brightness =
-                               device->backlight->props.max_brightness;
-               backlight_update_status(device->backlight);
                kfree(name);
 
                device->cdev = thermal_cooling_device_register("LCD",
@@ -1065,13 +1181,12 @@ acpi_video_device_write_brightness(struct file *file,
        /* validate through the list of available levels */
        for (i = 2; i < dev->brightness->count; i++)
                if (level == dev->brightness->levels[i]) {
-                       if (ACPI_SUCCESS
-                           (acpi_video_device_lcd_set_level(dev, level)))
-                               dev->brightness->curr = level;
+                       if (!acpi_video_device_lcd_set_level(dev, level))
+                               return count;
                        break;
                }
 
-       return count;
+       return -EINVAL;
 }
 
 static int acpi_video_device_EDID_seq_show(struct seq_file *seq, void *offset)
@@ -1753,15 +1868,29 @@ acpi_video_get_next_level(struct acpi_video_device *device,
        }
 }
 
-static void
+static int
 acpi_video_switch_brightness(struct acpi_video_device *device, int event)
 {
        unsigned long long level_current, level_next;
+       int result = -EINVAL;
+
        if (!device->brightness)
-               return;
-       acpi_video_device_lcd_get_level_current(device, &level_current);
+               goto out;
+
+       result = acpi_video_device_lcd_get_level_current(device,
+                                                        &level_current);
+       if (result)
+               goto out;
+
        level_next = acpi_video_get_next_level(device, level_current, event);
-       acpi_video_device_lcd_set_level(device, level_next);
+
+       result = acpi_video_device_lcd_set_level(device, level_next);
+
+out:
+       if (result)
+               printk(KERN_ERR PREFIX "Failed to switch the brightness\n");
+
+       return result;
 }
 
 static int
@@ -2128,7 +2257,27 @@ static int acpi_video_bus_remove(struct acpi_device *device, int type)
        return 0;
 }
 
-static int __init acpi_video_init(void)
+static int __init intel_opregion_present(void)
+{
+#if defined(CONFIG_DRM_I915) || defined(CONFIG_DRM_I915_MODULE)
+       struct pci_dev *dev = NULL;
+       u32 address;
+
+       for_each_pci_dev(dev) {
+               if ((dev->class >> 8) != PCI_CLASS_DISPLAY_VGA)
+                       continue;
+               if (dev->vendor != PCI_VENDOR_ID_INTEL)
+                       continue;
+               pci_read_config_dword(dev, 0xfc, &address);
+               if (!address)
+                       continue;
+               return 1;
+       }
+#endif
+       return 0;
+}
+
+int acpi_video_register(void)
 {
        int result = 0;
 
@@ -2145,6 +2294,22 @@ static int __init acpi_video_init(void)
 
        return 0;
 }
+EXPORT_SYMBOL(acpi_video_register);
+
+/*
+ * This is kind of nasty. Hardware using Intel chipsets may require
+ * the video opregion code to be run first in order to initialise
+ * state before any ACPI video calls are made. To handle this we defer
+ * registration of the video class until the opregion code has run.
+ */
+
+static int __init acpi_video_init(void)
+{
+       if (intel_opregion_present())
+               return 0;
+
+       return acpi_video_register();
+}
 
 static void __exit acpi_video_exit(void)
 {