u16 cycle_count;
u16 temp_now;
u16 voltage_now;
- s16 current_now;
- s16 current_avg;
+ s16 rate_now;
+ s16 rate_avg;
u16 capacity_now;
u16 state_of_charge;
u16 state;
return -ENODEV;
switch (psp) {
case POWER_SUPPLY_PROP_STATUS:
- if (battery->current_now < 0)
+ if (battery->rate_now < 0)
val->intval = POWER_SUPPLY_STATUS_DISCHARGING;
- else if (battery->current_now > 0)
+ else if (battery->rate_now > 0)
val->intval = POWER_SUPPLY_STATUS_CHARGING;
else
val->intval = POWER_SUPPLY_STATUS_FULL;
acpi_battery_vscale(battery) * 1000;
break;
case POWER_SUPPLY_PROP_CURRENT_NOW:
- val->intval = abs(battery->current_now) *
+ case POWER_SUPPLY_PROP_POWER_NOW:
+ val->intval = abs(battery->rate_now) *
acpi_battery_ipscale(battery) * 1000;
break;
case POWER_SUPPLY_PROP_CURRENT_AVG:
- val->intval = abs(battery->current_avg) *
+ case POWER_SUPPLY_PROP_POWER_AVG:
+ val->intval = abs(battery->rate_avg) *
acpi_battery_ipscale(battery) * 1000;
break;
case POWER_SUPPLY_PROP_CAPACITY:
POWER_SUPPLY_PROP_VOLTAGE_NOW,
POWER_SUPPLY_PROP_CURRENT_NOW,
POWER_SUPPLY_PROP_CURRENT_AVG,
+ POWER_SUPPLY_PROP_POWER_NOW,
+ POWER_SUPPLY_PROP_POWER_AVG,
POWER_SUPPLY_PROP_CAPACITY,
POWER_SUPPLY_PROP_ENERGY_FULL_DESIGN,
POWER_SUPPLY_PROP_ENERGY_FULL,
POWER_SUPPLY_PROP_MODEL_NAME,
POWER_SUPPLY_PROP_MANUFACTURER,
};
+
#endif
/* --------------------------------------------------------------------------
static struct acpi_battery_reader state_readers[] = {
{0x08, SMBUS_READ_WORD, offsetof(struct acpi_battery, temp_now)},
{0x09, SMBUS_READ_WORD, offsetof(struct acpi_battery, voltage_now)},
- {0x0a, SMBUS_READ_WORD, offsetof(struct acpi_battery, current_now)},
- {0x0b, SMBUS_READ_WORD, offsetof(struct acpi_battery, current_avg)},
+ {0x0a, SMBUS_READ_WORD, offsetof(struct acpi_battery, rate_now)},
+ {0x0b, SMBUS_READ_WORD, offsetof(struct acpi_battery, rate_avg)},
{0x0f, SMBUS_READ_WORD, offsetof(struct acpi_battery, capacity_now)},
{0x0e, SMBUS_READ_WORD, offsetof(struct acpi_battery, state_of_charge)},
{0x16, SMBUS_READ_WORD, offsetof(struct acpi_battery, state)},
acpi_sbs_add_fs(struct proc_dir_entry **dir,
struct proc_dir_entry *parent_dir,
char *dir_name,
- struct file_operations *info_fops,
- struct file_operations *state_fops,
- struct file_operations *alarm_fops, void *data)
+ const struct file_operations *info_fops,
+ const struct file_operations *state_fops,
+ const struct file_operations *alarm_fops, void *data)
{
if (!*dir) {
*dir = proc_mkdir(dir_name, parent_dir);
seq_printf(seq, "capacity state: %s\n",
(battery->state & 0x0010) ? "critical" : "ok");
seq_printf(seq, "charging state: %s\n",
- (battery->current_now < 0) ? "discharging" :
- ((battery->current_now > 0) ? "charging" : "charged"));
- rate = abs(battery->current_now) * acpi_battery_ipscale(battery);
+ (battery->rate_now < 0) ? "discharging" :
+ ((battery->rate_now > 0) ? "charging" : "charged"));
+ rate = abs(battery->rate_now) * acpi_battery_ipscale(battery);
rate *= (acpi_battery_mode(battery))?(battery->voltage_now *
acpi_battery_vscale(battery)/1000):1;
seq_printf(seq, "present rate: %d%s\n", rate,
return single_open(file, acpi_battery_read_alarm, PDE(inode)->data);
}
- static struct file_operations acpi_battery_info_fops = {
+ static const struct file_operations acpi_battery_info_fops = {
.open = acpi_battery_info_open_fs,
.read = seq_read,
.llseek = seq_lseek,
.owner = THIS_MODULE,
};
- static struct file_operations acpi_battery_state_fops = {
+ static const struct file_operations acpi_battery_state_fops = {
.open = acpi_battery_state_open_fs,
.read = seq_read,
.llseek = seq_lseek,
.owner = THIS_MODULE,
};
- static struct file_operations acpi_battery_alarm_fops = {
+ static const struct file_operations acpi_battery_alarm_fops = {
.open = acpi_battery_alarm_open_fs,
.read = seq_read,
.write = acpi_battery_write_alarm,
return single_open(file, acpi_ac_read_state, PDE(inode)->data);
}
- static struct file_operations acpi_ac_state_fops = {
+ static const struct file_operations acpi_ac_state_fops = {
.open = acpi_ac_state_open_fs,
.read = seq_read,
.llseek = seq_lseek,
#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>
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 {
/* bus */
static int acpi_video_bus_info_open_fs(struct inode *inode, struct file *file);
- static struct file_operations acpi_video_bus_info_fops = {
+ static const struct file_operations acpi_video_bus_info_fops = {
.owner = THIS_MODULE,
.open = acpi_video_bus_info_open_fs,
.read = seq_read,
};
static int acpi_video_bus_ROM_open_fs(struct inode *inode, struct file *file);
- static struct file_operations acpi_video_bus_ROM_fops = {
+ static const struct file_operations acpi_video_bus_ROM_fops = {
.owner = THIS_MODULE,
.open = acpi_video_bus_ROM_open_fs,
.read = seq_read,
static int acpi_video_bus_POST_info_open_fs(struct inode *inode,
struct file *file);
- static struct file_operations acpi_video_bus_POST_info_fops = {
+ static const struct file_operations acpi_video_bus_POST_info_fops = {
.owner = THIS_MODULE,
.open = acpi_video_bus_POST_info_open_fs,
.read = seq_read,
};
static int acpi_video_bus_POST_open_fs(struct inode *inode, struct file *file);
- static struct file_operations acpi_video_bus_POST_fops = {
+ static ssize_t acpi_video_bus_write_POST(struct file *file,
+ const char __user *buffer, size_t count, loff_t *data);
+ static const struct file_operations acpi_video_bus_POST_fops = {
.owner = THIS_MODULE,
.open = acpi_video_bus_POST_open_fs,
.read = seq_read,
+ .write = acpi_video_bus_write_POST,
.llseek = seq_lseek,
.release = single_release,
};
static int acpi_video_bus_DOS_open_fs(struct inode *inode, struct file *file);
- static struct file_operations acpi_video_bus_DOS_fops = {
+ static ssize_t acpi_video_bus_write_DOS(struct file *file,
+ const char __user *buffer, size_t count, loff_t *data);
+ static const struct file_operations acpi_video_bus_DOS_fops = {
.owner = THIS_MODULE,
.open = acpi_video_bus_DOS_open_fs,
.read = seq_read,
+ .write = acpi_video_bus_write_DOS,
.llseek = seq_lseek,
.release = single_release,
};
/* device */
static int acpi_video_device_info_open_fs(struct inode *inode,
struct file *file);
- static struct file_operations acpi_video_device_info_fops = {
+ static const struct file_operations acpi_video_device_info_fops = {
.owner = THIS_MODULE,
.open = acpi_video_device_info_open_fs,
.read = seq_read,
static int acpi_video_device_state_open_fs(struct inode *inode,
struct file *file);
- static struct file_operations acpi_video_device_state_fops = {
+ static ssize_t acpi_video_device_write_state(struct file *file,
+ const char __user *buffer, size_t count, loff_t *data);
+ static const struct file_operations acpi_video_device_state_fops = {
.owner = THIS_MODULE,
.open = acpi_video_device_state_open_fs,
.read = seq_read,
+ .write = acpi_video_device_write_state,
.llseek = seq_lseek,
.release = single_release,
};
static int acpi_video_device_brightness_open_fs(struct inode *inode,
struct file *file);
+ static ssize_t acpi_video_device_write_brightness(struct file *file,
+ const char __user *buffer, size_t count, loff_t *data);
static struct file_operations acpi_video_device_brightness_fops = {
.owner = THIS_MODULE,
.open = acpi_video_device_brightness_open_fs,
.read = seq_read,
+ .write = acpi_video_device_write_brightness,
.llseek = seq_lseek,
.release = single_release,
};
static int acpi_video_device_EDID_open_fs(struct inode *inode,
struct file *file);
- static struct file_operations acpi_video_device_EDID_fops = {
+ static const struct file_operations acpi_video_device_EDID_fops = {
.owner = THIS_MODULE,
.open = acpi_video_device_EDID_open_fs,
.read = seq_read,
.release = single_release,
};
- static char device_decode[][30] = {
+ static const char device_decode[][30] = {
"motherboard VGA device",
"PCI VGA device",
"AGP VGA device",
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);
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
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 = {
/* thermal cooling device callbacks */
-static int video_get_max_state(struct thermal_cooling_device *cdev, char *buf)
+static int video_get_max_state(struct thermal_cooling_device *cdev, unsigned
+ long *state)
{
struct acpi_device *device = cdev->devdata;
struct acpi_video_device *video = acpi_driver_data(device);
- return sprintf(buf, "%d\n", video->brightness->count - 3);
+ *state = video->brightness->count - 3;
+ return 0;
}
-static int video_get_cur_state(struct thermal_cooling_device *cdev, char *buf)
+static int video_get_cur_state(struct thermal_cooling_device *cdev, unsigned
+ long *state)
{
struct acpi_device *device = cdev->devdata;
struct acpi_video_device *video = acpi_driver_data(device);
unsigned long long level;
- int state;
+ int offset;
- acpi_video_device_lcd_get_level_current(video, &level);
- for (state = 2; state < video->brightness->count; state++)
- if (level == video->brightness->levels[state])
- return sprintf(buf, "%d\n",
- video->brightness->count - state - 1);
+ 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;
+ return 0;
+ }
return -EINVAL;
}
static int
-video_set_cur_state(struct thermal_cooling_device *cdev, unsigned int state)
+video_set_cur_state(struct thermal_cooling_device *cdev, unsigned long state)
{
struct acpi_device *device = cdev->devdata;
struct acpi_video_device *video = acpi_driver_data(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
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 "
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];
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);
out:
device->brightness = NULL;
kfree(obj);
- return 0;
+ return result;
}
/*
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));
}
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;
}
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;
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",
/* 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)
goto err_remove_dir;
/* 'state' [R/W] */
- acpi_video_device_state_fops.write = acpi_video_device_write_state;
entry = proc_create_data("state", S_IFREG | S_IRUGO | S_IWUSR,
device_dir,
&acpi_video_device_state_fops,
goto err_remove_info;
/* 'brightness' [R/W] */
- acpi_video_device_brightness_fops.write =
- acpi_video_device_write_brightness;
entry = proc_create_data("brightness", S_IFREG | S_IRUGO | S_IWUSR,
device_dir,
&acpi_video_device_brightness_fops,
goto err_remove_rom;
/* 'POST' [R/W] */
- acpi_video_bus_POST_fops.write = acpi_video_bus_write_POST;
entry = proc_create_data("POST", S_IFREG | S_IRUGO | S_IWUSR,
device_dir,
&acpi_video_bus_POST_fops,
goto err_remove_post_info;
/* 'DOS' [R/W] */
- acpi_video_bus_DOS_fops.write = acpi_video_bus_write_DOS;
entry = proc_create_data("DOS", S_IFREG | S_IRUGO | S_IWUSR,
device_dir,
&acpi_video_bus_DOS_fops,
}
}
-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
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;
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)
{
projects / linux-2.6-omap-h63xx.git / commitdiff