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linux/drivers/acpi/video.c

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/*
* video.c - ACPI Video Driver ($Revision:$)
*
* Copyright (C) 2004 Luming Yu <luming.yu@intel.com>
* Copyright (C) 2004 Bruno Ducrot <ducrot@poupinou.org>
*
* ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or (at
* your option) any later version.
*
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License for more details.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, write to the Free Software Foundation, Inc.,
* 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
*
* ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
*/
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/init.h>
#include <linux/types.h>
#include <linux/list.h>
#include <linux/proc_fs.h>
#include <linux/seq_file.h>
#include <asm/uaccess.h>
#include <acpi/acpi_bus.h>
#include <acpi/acpi_drivers.h>
#define ACPI_VIDEO_COMPONENT 0x08000000
#define ACPI_VIDEO_CLASS "video"
#define ACPI_VIDEO_DRIVER_NAME "ACPI Video Driver"
#define ACPI_VIDEO_BUS_NAME "Video Bus"
#define ACPI_VIDEO_DEVICE_NAME "Video Device"
#define ACPI_VIDEO_NOTIFY_SWITCH 0x80
#define ACPI_VIDEO_NOTIFY_PROBE 0x81
#define ACPI_VIDEO_NOTIFY_CYCLE 0x82
#define ACPI_VIDEO_NOTIFY_NEXT_OUTPUT 0x83
#define ACPI_VIDEO_NOTIFY_PREV_OUTPUT 0x84
#define ACPI_VIDEO_NOTIFY_CYCLE_BRIGHTNESS 0x82
#define ACPI_VIDEO_NOTIFY_INC_BRIGHTNESS 0x83
#define ACPI_VIDEO_NOTIFY_DEC_BRIGHTNESS 0x84
#define ACPI_VIDEO_NOTIFY_ZERO_BRIGHTNESS 0x85
#define ACPI_VIDEO_NOTIFY_DISPLAY_OFF 0x86
#define ACPI_VIDEO_HEAD_INVALID (~0u - 1)
#define ACPI_VIDEO_HEAD_END (~0u)
#define _COMPONENT ACPI_VIDEO_COMPONENT
ACPI_MODULE_NAME("acpi_video")
MODULE_AUTHOR("Bruno Ducrot");
MODULE_DESCRIPTION(ACPI_VIDEO_DRIVER_NAME);
MODULE_LICENSE("GPL");
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_bus_match(struct acpi_device *device,
struct acpi_driver *driver);
static struct acpi_driver acpi_video_bus = {
.name = ACPI_VIDEO_DRIVER_NAME,
.class = ACPI_VIDEO_CLASS,
.ops = {
.add = acpi_video_bus_add,
.remove = acpi_video_bus_remove,
.match = acpi_video_bus_match,
},
};
struct acpi_video_bus_flags {
u8 multihead:1; /* can switch video heads */
u8 rom:1; /* can retrieve a video rom */
u8 post:1; /* can configure the head to */
u8 reserved:5;
};
struct acpi_video_bus_cap {
u8 _DOS:1; /*Enable/Disable output switching */
u8 _DOD:1; /*Enumerate all devices attached to display adapter */
u8 _ROM:1; /*Get ROM Data */
u8 _GPD:1; /*Get POST Device */
u8 _SPD:1; /*Set POST Device */
u8 _VPO:1; /*Video POST Options */
u8 reserved:2;
};
struct acpi_video_device_attrib {
u32 display_index:4; /* A zero-based instance of the Display */
u32 display_port_attachment:4; /*This field differenates displays type */
u32 display_type:4; /*Describe the specific type in use */
u32 vendor_specific:4; /*Chipset Vendor Specifi */
u32 bios_can_detect:1; /*BIOS can detect the device */
u32 depend_on_vga:1; /*Non-VGA output device whose power is related to
the VGA device. */
u32 pipe_id:3; /*For VGA multiple-head devices. */
u32 reserved:10; /*Must be 0 */
u32 device_id_scheme:1; /*Device ID Scheme */
};
struct acpi_video_enumerated_device {
union {
u32 int_val;
struct acpi_video_device_attrib attrib;
} value;
struct acpi_video_device *bind_info;
};
struct acpi_video_bus {
struct acpi_device *device;
u8 dos_setting;
struct acpi_video_enumerated_device *attached_array;
u8 attached_count;
struct acpi_video_bus_cap cap;
struct acpi_video_bus_flags flags;
struct semaphore sem;
struct list_head video_device_list;
struct proc_dir_entry *dir;
};
struct acpi_video_device_flags {
u8 crt:1;
u8 lcd:1;
u8 tvout:1;
u8 bios:1;
u8 unknown:1;
u8 reserved:3;
};
struct acpi_video_device_cap {
u8 _ADR:1; /*Return the unique ID */
u8 _BCL:1; /*Query list of brightness control levels supported */
u8 _BCM:1; /*Set the brightness level */
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 */
u8 _reserved:1;
};
struct acpi_video_device_brightness {
int curr;
int count;
int *levels;
};
struct acpi_video_device {
unsigned long device_id;
struct acpi_video_device_flags flags;
struct acpi_video_device_cap cap;
struct list_head entry;
struct acpi_video_bus *video;
struct acpi_device *dev;
struct acpi_video_device_brightness *brightness;
};
/* bus */
static int acpi_video_bus_info_open_fs(struct inode *inode, struct file *file);
static struct file_operations acpi_video_bus_info_fops = {
.open = acpi_video_bus_info_open_fs,
.read = seq_read,
.llseek = seq_lseek,
.release = single_release,
};
static int acpi_video_bus_ROM_open_fs(struct inode *inode, struct file *file);
static struct file_operations acpi_video_bus_ROM_fops = {
.open = acpi_video_bus_ROM_open_fs,
.read = seq_read,
.llseek = seq_lseek,
.release = single_release,
};
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 = {
.open = acpi_video_bus_POST_info_open_fs,
.read = seq_read,
.llseek = seq_lseek,
.release = single_release,
};
static int acpi_video_bus_POST_open_fs(struct inode *inode, struct file *file);
static struct file_operations acpi_video_bus_POST_fops = {
.open = acpi_video_bus_POST_open_fs,
.read = seq_read,
.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 = {
.open = acpi_video_bus_DOS_open_fs,
.read = seq_read,
.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 = {
.open = acpi_video_device_info_open_fs,
.read = seq_read,
.llseek = seq_lseek,
.release = single_release,
};
static int acpi_video_device_state_open_fs(struct inode *inode,
struct file *file);
static struct file_operations acpi_video_device_state_fops = {
.open = acpi_video_device_state_open_fs,
.read = seq_read,
.llseek = seq_lseek,
.release = single_release,
};
static int acpi_video_device_brightness_open_fs(struct inode *inode,
struct file *file);
static struct file_operations acpi_video_device_brightness_fops = {
.open = acpi_video_device_brightness_open_fs,
.read = seq_read,
.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 = {
.open = acpi_video_device_EDID_open_fs,
.read = seq_read,
.llseek = seq_lseek,
.release = single_release,
};
static char device_decode[][30] = {
"motherboard VGA device",
"PCI VGA device",
"AGP VGA device",
"UNKNOWN",
};
static void acpi_video_device_notify(acpi_handle handle, u32 event, void *data);
static void acpi_video_device_rebind(struct acpi_video_bus *video);
static void acpi_video_device_bind(struct acpi_video_bus *video,
struct acpi_video_device *device);
static int acpi_video_device_enumerate(struct acpi_video_bus *video);
static int acpi_video_switch_output(struct acpi_video_bus *video, int event);
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,
int event);
/* --------------------------------------------------------------------------
Video Management
-------------------------------------------------------------------------- */
/* device */
static int
acpi_video_device_query(struct acpi_video_device *device, unsigned long *state)
{
int status;
status = acpi_evaluate_integer(device->dev->handle, "_DGS", NULL, state);
return status;
}
static int
acpi_video_device_get_state(struct acpi_video_device *device,
unsigned long *state)
{
int status;
status = acpi_evaluate_integer(device->dev->handle, "_DCS", NULL, state);
return status;
}
static int
acpi_video_device_set_state(struct acpi_video_device *device, int state)
{
int status;
union acpi_object arg0 = { ACPI_TYPE_INTEGER };
struct acpi_object_list args = { 1, &arg0 };
unsigned long ret;
arg0.integer.value = state;
status = acpi_evaluate_integer(device->dev->handle, "_DSS", &args, &ret);
return status;
}
static int
acpi_video_device_lcd_query_levels(struct acpi_video_device *device,
union acpi_object **levels)
{
int status;
struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
union acpi_object *obj;
*levels = NULL;
status = acpi_evaluate_object(device->dev->handle, "_BCL", NULL, &buffer);
if (!ACPI_SUCCESS(status))
return status;
obj = (union acpi_object *)buffer.pointer;
if (!obj || (obj->type != ACPI_TYPE_PACKAGE)) {
printk(KERN_ERR PREFIX "Invalid _BCL data\n");
status = -EFAULT;
goto err;
}
*levels = obj;
return 0;
err:
kfree(buffer.pointer);
return status;
}
static int
acpi_video_device_lcd_set_level(struct acpi_video_device *device, int level)
{
int status;
union acpi_object arg0 = { ACPI_TYPE_INTEGER };
struct acpi_object_list args = { 1, &arg0 };
arg0.integer.value = level;
status = acpi_evaluate_object(device->dev->handle, "_BCM", &args, NULL);
printk(KERN_DEBUG "set_level status: %x\n", status);
return status;
}
static int
acpi_video_device_lcd_get_level_current(struct acpi_video_device *device,
unsigned long *level)
{
int status;
status = acpi_evaluate_integer(device->dev->handle, "_BQC", NULL, level);
return status;
}
static int
acpi_video_device_EDID(struct acpi_video_device *device,
union acpi_object **edid, ssize_t length)
{
int status;
struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
union acpi_object *obj;
union acpi_object arg0 = { ACPI_TYPE_INTEGER };
struct acpi_object_list args = { 1, &arg0 };
*edid = NULL;
if (!device)
return -ENODEV;
if (length == 128)
arg0.integer.value = 1;
else if (length == 256)
arg0.integer.value = 2;
else
return -EINVAL;
status = acpi_evaluate_object(device->dev->handle, "_DDC", &args, &buffer);
if (ACPI_FAILURE(status))
return -ENODEV;
obj = (union acpi_object *)buffer.pointer;
if (obj && obj->type == ACPI_TYPE_BUFFER)
*edid = obj;
else {
printk(KERN_ERR PREFIX "Invalid _DDC data\n");
status = -EFAULT;
kfree(obj);
}
return status;
}
/* bus */
static int
acpi_video_bus_set_POST(struct acpi_video_bus *video, unsigned long option)
{
int status;
unsigned long tmp;
union acpi_object arg0 = { ACPI_TYPE_INTEGER };
struct acpi_object_list args = { 1, &arg0 };
arg0.integer.value = option;
status = acpi_evaluate_integer(video->device->handle, "_SPD", &args, &tmp);
if (ACPI_SUCCESS(status))
status = tmp ? (-EINVAL) : (AE_OK);
return status;
}
static int
acpi_video_bus_get_POST(struct acpi_video_bus *video, unsigned long *id)
{
int status;
status = acpi_evaluate_integer(video->device->handle, "_GPD", NULL, id);
return status;
}
static int
acpi_video_bus_POST_options(struct acpi_video_bus *video,
unsigned long *options)
{
int status;
status = acpi_evaluate_integer(video->device->handle, "_VPO", NULL, options);
*options &= 3;
return status;
}
/*
* Arg:
* video : video bus device pointer
* bios_flag :
* 0. The system BIOS should NOT automatically switch(toggle)
* the active display output.
* 1. The system BIOS should automatically switch (toggle) the
* active display output. No swich event.
* 2. The _DGS value should be locked.
* 3. The system BIOS should not automatically switch (toggle) the
* active display output, but instead generate the display switch
* event notify code.
* lcd_flag :
* 0. The system BIOS should automatically control the brightness level
* of the LCD, when the power changes from AC to DC
* 1. The system BIOS should NOT automatically control the brightness
* level of the LCD, when the power changes from AC to DC.
* Return Value:
* -1 wrong arg.
*/
static int
acpi_video_bus_DOS(struct acpi_video_bus *video, int bios_flag, int lcd_flag)
{
acpi_integer status = 0;
union acpi_object arg0 = { ACPI_TYPE_INTEGER };
struct acpi_object_list args = { 1, &arg0 };
if (bios_flag < 0 || bios_flag > 3 || lcd_flag < 0 || lcd_flag > 1) {
status = -1;
goto Failed;
}
arg0.integer.value = (lcd_flag << 2) | bios_flag;
video->dos_setting = arg0.integer.value;
acpi_evaluate_object(video->device->handle, "_DOS", &args, NULL);
Failed:
return status;
}
/*
* Arg:
* device : video output device (LCD, CRT, ..)
*
* Return Value:
* None
*
* Find out all required AML method defined under the output
* device.
*/
static void acpi_video_device_find_cap(struct acpi_video_device *device)
{
acpi_integer status;
acpi_handle h_dummy1;
int i;
union acpi_object *obj = NULL;
struct acpi_video_device_brightness *br = NULL;
memset(&device->cap, 0, 4);
if (ACPI_SUCCESS(acpi_get_handle(device->dev->handle, "_ADR", &h_dummy1))) {
device->cap._ADR = 1;
}
if (ACPI_SUCCESS(acpi_get_handle(device->dev->handle, "_BCL", &h_dummy1))) {
device->cap._BCL = 1;
}
if (ACPI_SUCCESS(acpi_get_handle(device->dev->handle, "_BCM", &h_dummy1))) {
device->cap._BCM = 1;
}
if (ACPI_SUCCESS(acpi_get_handle(device->dev->handle, "_DDC", &h_dummy1))) {
device->cap._DDC = 1;
}
if (ACPI_SUCCESS(acpi_get_handle(device->dev->handle, "_DCS", &h_dummy1))) {
device->cap._DCS = 1;
}
if (ACPI_SUCCESS(acpi_get_handle(device->dev->handle, "_DGS", &h_dummy1))) {
device->cap._DGS = 1;
}
if (ACPI_SUCCESS(acpi_get_handle(device->dev->handle, "_DSS", &h_dummy1))) {
device->cap._DSS = 1;
}
status = acpi_video_device_lcd_query_levels(device, &obj);
if (obj && obj->type == ACPI_TYPE_PACKAGE && obj->package.count >= 2) {
int count = 0;
union acpi_object *o;
br = kmalloc(sizeof(*br), GFP_KERNEL);
if (!br) {
printk(KERN_ERR "can't allocate memory\n");
} else {
memset(br, 0, sizeof(*br));
br->levels = kmalloc(obj->package.count *
sizeof *(br->levels), GFP_KERNEL);
if (!br->levels)
goto out;
for (i = 0; i < obj->package.count; i++) {
o = (union acpi_object *)&obj->package.
elements[i];
if (o->type != ACPI_TYPE_INTEGER) {
printk(KERN_ERR PREFIX "Invalid data\n");
continue;
}
br->levels[count] = (u32) o->integer.value;
count++;
}
out:
if (count < 2) {
kfree(br->levels);
kfree(br);
} else {
br->count = count;
device->brightness = br;
ACPI_DEBUG_PRINT((ACPI_DB_INFO,
"found %d brightness levels\n",
count));
}
}
}
kfree(obj);
return;
}
/*
* Arg:
* device : video output device (VGA)
*
* Return Value:
* None
*
* Find out all required AML method defined under the video bus device.
*/
static void acpi_video_bus_find_cap(struct acpi_video_bus *video)
{
acpi_handle h_dummy1;
memset(&video->cap, 0, 4);
if (ACPI_SUCCESS(acpi_get_handle(video->device->handle, "_DOS", &h_dummy1))) {
video->cap._DOS = 1;
}
if (ACPI_SUCCESS(acpi_get_handle(video->device->handle, "_DOD", &h_dummy1))) {
video->cap._DOD = 1;
}
if (ACPI_SUCCESS(acpi_get_handle(video->device->handle, "_ROM", &h_dummy1))) {
video->cap._ROM = 1;
}
if (ACPI_SUCCESS(acpi_get_handle(video->device->handle, "_GPD", &h_dummy1))) {
video->cap._GPD = 1;
}
if (ACPI_SUCCESS(acpi_get_handle(video->device->handle, "_SPD", &h_dummy1))) {
video->cap._SPD = 1;
}
if (ACPI_SUCCESS(acpi_get_handle(video->device->handle, "_VPO", &h_dummy1))) {
video->cap._VPO = 1;
}
}
/*
* Check whether the video bus device has required AML method to
* support the desired features
*/
static int acpi_video_bus_check(struct acpi_video_bus *video)
{
acpi_status status = -ENOENT;
if (!video)
return -EINVAL;
/* Since there is no HID, CID and so on for VGA driver, we have
* to check well known required nodes.
*/
/* Does this device able to support video switching ? */
if (video->cap._DOS) {
video->flags.multihead = 1;
status = 0;
}
/* Does this device able to retrieve a retrieve a video ROM ? */
if (video->cap._ROM) {
video->flags.rom = 1;
status = 0;
}
/* Does this device able to configure which video device to POST ? */
if (video->cap._GPD && video->cap._SPD && video->cap._VPO) {
video->flags.post = 1;
status = 0;
}
return status;
}
/* --------------------------------------------------------------------------
FS Interface (/proc)
-------------------------------------------------------------------------- */
static struct proc_dir_entry *acpi_video_dir;
/* video devices */
static int acpi_video_device_info_seq_show(struct seq_file *seq, void *offset)
{
struct acpi_video_device *dev =
(struct acpi_video_device *)seq->private;
if (!dev)
goto end;
seq_printf(seq, "device_id: 0x%04x\n", (u32) dev->device_id);
seq_printf(seq, "type: ");
if (dev->flags.crt)
seq_printf(seq, "CRT\n");
else if (dev->flags.lcd)
seq_printf(seq, "LCD\n");
else if (dev->flags.tvout)
seq_printf(seq, "TVOUT\n");
else
seq_printf(seq, "UNKNOWN\n");
seq_printf(seq, "known by bios: %s\n", dev->flags.bios ? "yes" : "no");
end:
return 0;
}
static int
acpi_video_device_info_open_fs(struct inode *inode, struct file *file)
{
return single_open(file, acpi_video_device_info_seq_show,
PDE(inode)->data);
}
static int acpi_video_device_state_seq_show(struct seq_file *seq, void *offset)
{
int status;
struct acpi_video_device *dev =
(struct acpi_video_device *)seq->private;
unsigned long state;
if (!dev)
goto end;
status = acpi_video_device_get_state(dev, &state);
seq_printf(seq, "state: ");
if (ACPI_SUCCESS(status))
seq_printf(seq, "0x%02lx\n", state);
else
seq_printf(seq, "<not supported>\n");
status = acpi_video_device_query(dev, &state);
seq_printf(seq, "query: ");
if (ACPI_SUCCESS(status))
seq_printf(seq, "0x%02lx\n", state);
else
seq_printf(seq, "<not supported>\n");
end:
return 0;
}
static int
acpi_video_device_state_open_fs(struct inode *inode, struct file *file)
{
return single_open(file, acpi_video_device_state_seq_show,
PDE(inode)->data);
}
static ssize_t
acpi_video_device_write_state(struct file *file,
const char __user * buffer,
size_t count, loff_t * data)
{
int status;
struct seq_file *m = (struct seq_file *)file->private_data;
struct acpi_video_device *dev = (struct acpi_video_device *)m->private;
char str[12] = { 0 };
u32 state = 0;
if (!dev || count + 1 > sizeof str)
return -EINVAL;
if (copy_from_user(str, buffer, count))
return -EFAULT;
str[count] = 0;
state = simple_strtoul(str, NULL, 0);
state &= ((1ul << 31) | (1ul << 30) | (1ul << 0));
status = acpi_video_device_set_state(dev, state);
if (status)
return -EFAULT;
return count;
}
static int
acpi_video_device_brightness_seq_show(struct seq_file *seq, void *offset)
{
struct acpi_video_device *dev =
(struct acpi_video_device *)seq->private;
int i;
if (!dev || !dev->brightness) {
seq_printf(seq, "<not supported>\n");
return 0;
}
seq_printf(seq, "levels: ");
for (i = 0; i < dev->brightness->count; i++)
seq_printf(seq, " %d", dev->brightness->levels[i]);
seq_printf(seq, "\ncurrent: %d\n", dev->brightness->curr);
return 0;
}
static int
acpi_video_device_brightness_open_fs(struct inode *inode, struct file *file)
{
return single_open(file, acpi_video_device_brightness_seq_show,
PDE(inode)->data);
}
static ssize_t
acpi_video_device_write_brightness(struct file *file,
const char __user * buffer,
size_t count, loff_t * data)
{
struct seq_file *m = (struct seq_file *)file->private_data;
struct acpi_video_device *dev = (struct acpi_video_device *)m->private;
char str[4] = { 0 };
unsigned int level = 0;
int i;
if (!dev || !dev->brightness || count + 1 > sizeof str)
return -EINVAL;
if (copy_from_user(str, buffer, count))
return -EFAULT;
str[count] = 0;
level = simple_strtoul(str, NULL, 0);
if (level > 100)
return -EFAULT;
/* validate though the list of available levels */
for (i = 0; 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;
break;
}
return count;
}
static int acpi_video_device_EDID_seq_show(struct seq_file *seq, void *offset)
{
struct acpi_video_device *dev =
(struct acpi_video_device *)seq->private;
int status;
int i;
union acpi_object *edid = NULL;
if (!dev)
goto out;
status = acpi_video_device_EDID(dev, &edid, 128);
if (ACPI_FAILURE(status)) {
status = acpi_video_device_EDID(dev, &edid, 256);
}
if (ACPI_FAILURE(status)) {
goto out;
}
if (edid && edid->type == ACPI_TYPE_BUFFER) {
for (i = 0; i < edid->buffer.length; i++)
seq_putc(seq, edid->buffer.pointer[i]);
}
out:
if (!edid)
seq_printf(seq, "<not supported>\n");
else
kfree(edid);
return 0;
}
static int
acpi_video_device_EDID_open_fs(struct inode *inode, struct file *file)
{
return single_open(file, acpi_video_device_EDID_seq_show,
PDE(inode)->data);
}
static int acpi_video_device_add_fs(struct acpi_device *device)
{
struct proc_dir_entry *entry = NULL;
struct acpi_video_device *vid_dev;
if (!device)
return -ENODEV;
vid_dev = (struct acpi_video_device *)acpi_driver_data(device);
if (!vid_dev)
return -ENODEV;
if (!acpi_device_dir(device)) {
acpi_device_dir(device) = proc_mkdir(acpi_device_bid(device),
vid_dev->video->dir);
if (!acpi_device_dir(device))
return -ENODEV;
acpi_device_dir(device)->owner = THIS_MODULE;
}
/* 'info' [R] */
entry = create_proc_entry("info", S_IRUGO, acpi_device_dir(device));
if (!entry)
return -ENODEV;
else {
entry->proc_fops = &acpi_video_device_info_fops;
entry->data = acpi_driver_data(device);
entry->owner = THIS_MODULE;
}
/* 'state' [R/W] */
entry =
create_proc_entry("state", S_IFREG | S_IRUGO | S_IWUSR,
acpi_device_dir(device));
if (!entry)
return -ENODEV;
else {
acpi_video_device_state_fops.write = acpi_video_device_write_state;
entry->proc_fops = &acpi_video_device_state_fops;
entry->data = acpi_driver_data(device);
entry->owner = THIS_MODULE;
}
/* 'brightness' [R/W] */
entry =
create_proc_entry("brightness", S_IFREG | S_IRUGO | S_IWUSR,
acpi_device_dir(device));
if (!entry)
return -ENODEV;
else {
acpi_video_device_brightness_fops.write = acpi_video_device_write_brightness;
entry->proc_fops = &acpi_video_device_brightness_fops;
entry->data = acpi_driver_data(device);
entry->owner = THIS_MODULE;
}
/* 'EDID' [R] */
entry = create_proc_entry("EDID", S_IRUGO, acpi_device_dir(device));
if (!entry)
return -ENODEV;
else {
entry->proc_fops = &acpi_video_device_EDID_fops;
entry->data = acpi_driver_data(device);
entry->owner = THIS_MODULE;
}
return 0;
}
static int acpi_video_device_remove_fs(struct acpi_device *device)
{
struct acpi_video_device *vid_dev;
vid_dev = (struct acpi_video_device *)acpi_driver_data(device);
if (!vid_dev || !vid_dev->video || !vid_dev->video->dir)
return -ENODEV;
if (acpi_device_dir(device)) {
remove_proc_entry("info", acpi_device_dir(device));
remove_proc_entry("state", acpi_device_dir(device));
remove_proc_entry("brightness", acpi_device_dir(device));
remove_proc_entry("EDID", acpi_device_dir(device));
remove_proc_entry(acpi_device_bid(device), vid_dev->video->dir);
acpi_device_dir(device) = NULL;
}
return 0;
}
/* video bus */
static int acpi_video_bus_info_seq_show(struct seq_file *seq, void *offset)
{
struct acpi_video_bus *video = (struct acpi_video_bus *)seq->private;
if (!video)
goto end;
seq_printf(seq, "Switching heads: %s\n",
video->flags.multihead ? "yes" : "no");
seq_printf(seq, "Video ROM: %s\n",
video->flags.rom ? "yes" : "no");
seq_printf(seq, "Device to be POSTed on boot: %s\n",
video->flags.post ? "yes" : "no");
end:
return 0;
}
static int acpi_video_bus_info_open_fs(struct inode *inode, struct file *file)
{
return single_open(file, acpi_video_bus_info_seq_show,
PDE(inode)->data);
}
static int acpi_video_bus_ROM_seq_show(struct seq_file *seq, void *offset)
{
struct acpi_video_bus *video = (struct acpi_video_bus *)seq->private;
if (!video)
goto end;
printk(KERN_INFO PREFIX "Please implement %s\n", __FUNCTION__);
seq_printf(seq, "<TODO>\n");
end:
return 0;
}
static int acpi_video_bus_ROM_open_fs(struct inode *inode, struct file *file)
{
return single_open(file, acpi_video_bus_ROM_seq_show, PDE(inode)->data);
}
static int acpi_video_bus_POST_info_seq_show(struct seq_file *seq, void *offset)
{
struct acpi_video_bus *video = (struct acpi_video_bus *)seq->private;
unsigned long options;
int status;
if (!video)
goto end;
status = acpi_video_bus_POST_options(video, &options);
if (ACPI_SUCCESS(status)) {
if (!(options & 1)) {
printk(KERN_WARNING PREFIX
"The motherboard VGA device is not listed as a possible POST device.\n");
printk(KERN_WARNING PREFIX
"This indicate a BIOS bug. Please contact the manufacturer.\n");
}
printk("%lx\n", options);
seq_printf(seq, "can POST: <intgrated video>");
if (options & 2)
seq_printf(seq, " <PCI video>");
if (options & 4)
seq_printf(seq, " <AGP video>");
seq_putc(seq, '\n');
} else
seq_printf(seq, "<not supported>\n");
end:
return 0;
}
static int
acpi_video_bus_POST_info_open_fs(struct inode *inode, struct file *file)
{
return single_open(file, acpi_video_bus_POST_info_seq_show,
PDE(inode)->data);
}
static int acpi_video_bus_POST_seq_show(struct seq_file *seq, void *offset)
{
struct acpi_video_bus *video = (struct acpi_video_bus *)seq->private;
int status;
unsigned long id;
if (!video)
goto end;
status = acpi_video_bus_get_POST(video, &id);
if (!ACPI_SUCCESS(status)) {
seq_printf(seq, "<not supported>\n");
goto end;
}
seq_printf(seq, "device posted is <%s>\n", device_decode[id & 3]);
end:
return 0;
}
static int acpi_video_bus_DOS_seq_show(struct seq_file *seq, void *offset)
{
struct acpi_video_bus *video = (struct acpi_video_bus *)seq->private;
seq_printf(seq, "DOS setting: <%d>\n", video->dos_setting);
return 0;
}
static int acpi_video_bus_POST_open_fs(struct inode *inode, struct file *file)
{
return single_open(file, acpi_video_bus_POST_seq_show,
PDE(inode)->data);
}
static int acpi_video_bus_DOS_open_fs(struct inode *inode, struct file *file)
{
return single_open(file, acpi_video_bus_DOS_seq_show, PDE(inode)->data);
}
static ssize_t
acpi_video_bus_write_POST(struct file *file,
const char __user * buffer,
size_t count, loff_t * data)
{
int status;
struct seq_file *m = (struct seq_file *)file->private_data;
struct acpi_video_bus *video = (struct acpi_video_bus *)m->private;
char str[12] = { 0 };
unsigned long opt, options;
if (!video || count + 1 > sizeof str)
return -EINVAL;
status = acpi_video_bus_POST_options(video, &options);
if (!ACPI_SUCCESS(status))
return -EINVAL;
if (copy_from_user(str, buffer, count))
return -EFAULT;
str[count] = 0;
opt = strtoul(str, NULL, 0);
if (opt > 3)
return -EFAULT;
/* just in case an OEM 'forget' the motherboard... */
options |= 1;
if (options & (1ul << opt)) {
status = acpi_video_bus_set_POST(video, opt);
if (!ACPI_SUCCESS(status))
return -EFAULT;
}
return count;
}
static ssize_t
acpi_video_bus_write_DOS(struct file *file,
const char __user * buffer,
size_t count, loff_t * data)
{
int status;
struct seq_file *m = (struct seq_file *)file->private_data;
struct acpi_video_bus *video = (struct acpi_video_bus *)m->private;
char str[12] = { 0 };
unsigned long opt;
if (!video || count + 1 > sizeof str)
return -EINVAL;
if (copy_from_user(str, buffer, count))
return -EFAULT;
str[count] = 0;
opt = strtoul(str, NULL, 0);
if (opt > 7)
return -EFAULT;
status = acpi_video_bus_DOS(video, opt & 0x3, (opt & 0x4) >> 2);
if (!ACPI_SUCCESS(status))
return -EFAULT;
return count;
}
static int acpi_video_bus_add_fs(struct acpi_device *device)
{
struct proc_dir_entry *entry = NULL;
struct acpi_video_bus *video;
video = (struct acpi_video_bus *)acpi_driver_data(device);
if (!acpi_device_dir(device)) {
acpi_device_dir(device) = proc_mkdir(acpi_device_bid(device),
acpi_video_dir);
if (!acpi_device_dir(device))
return -ENODEV;
video->dir = acpi_device_dir(device);
acpi_device_dir(device)->owner = THIS_MODULE;
}
/* 'info' [R] */
entry = create_proc_entry("info", S_IRUGO, acpi_device_dir(device));
if (!entry)
return -ENODEV;
else {
entry->proc_fops = &acpi_video_bus_info_fops;
entry->data = acpi_driver_data(device);
entry->owner = THIS_MODULE;
}
/* 'ROM' [R] */
entry = create_proc_entry("ROM", S_IRUGO, acpi_device_dir(device));
if (!entry)
return -ENODEV;
else {
entry->proc_fops = &acpi_video_bus_ROM_fops;
entry->data = acpi_driver_data(device);
entry->owner = THIS_MODULE;
}
/* 'POST_info' [R] */
entry =
create_proc_entry("POST_info", S_IRUGO, acpi_device_dir(device));
if (!entry)
return -ENODEV;
else {
entry->proc_fops = &acpi_video_bus_POST_info_fops;
entry->data = acpi_driver_data(device);
entry->owner = THIS_MODULE;
}
/* 'POST' [R/W] */
entry =
create_proc_entry("POST", S_IFREG | S_IRUGO | S_IRUSR,
acpi_device_dir(device));
if (!entry)
return -ENODEV;
else {
acpi_video_bus_POST_fops.write = acpi_video_bus_write_POST;
entry->proc_fops = &acpi_video_bus_POST_fops;
entry->data = acpi_driver_data(device);
entry->owner = THIS_MODULE;
}
/* 'DOS' [R/W] */
entry =
create_proc_entry("DOS", S_IFREG | S_IRUGO | S_IRUSR,
acpi_device_dir(device));
if (!entry)
return -ENODEV;
else {
acpi_video_bus_DOS_fops.write = acpi_video_bus_write_DOS;
entry->proc_fops = &acpi_video_bus_DOS_fops;
entry->data = acpi_driver_data(device);
entry->owner = THIS_MODULE;
}
return 0;
}
static int acpi_video_bus_remove_fs(struct acpi_device *device)
{
struct acpi_video_bus *video;
video = (struct acpi_video_bus *)acpi_driver_data(device);
if (acpi_device_dir(device)) {
remove_proc_entry("info", acpi_device_dir(device));
remove_proc_entry("ROM", acpi_device_dir(device));
remove_proc_entry("POST_info", acpi_device_dir(device));
remove_proc_entry("POST", acpi_device_dir(device));
remove_proc_entry("DOS", acpi_device_dir(device));
remove_proc_entry(acpi_device_bid(device), acpi_video_dir);
acpi_device_dir(device) = NULL;
}
return 0;
}
/* --------------------------------------------------------------------------
Driver Interface
-------------------------------------------------------------------------- */
/* device interface */
static int
acpi_video_bus_get_one_device(struct acpi_device *device,
struct acpi_video_bus *video)
{
unsigned long device_id;
int status;
struct acpi_video_device *data;
if (!device || !video)
return -EINVAL;
status =
acpi_evaluate_integer(device->handle, "_ADR", NULL, &device_id);
if (ACPI_SUCCESS(status)) {
data = kmalloc(sizeof(struct acpi_video_device), GFP_KERNEL);
if (!data)
return -ENOMEM;
memset(data, 0, sizeof(struct acpi_video_device));
strcpy(acpi_device_name(device), ACPI_VIDEO_DEVICE_NAME);
strcpy(acpi_device_class(device), ACPI_VIDEO_CLASS);
acpi_driver_data(device) = data;
data->device_id = device_id;
data->video = video;
data->dev = device;
switch (device_id & 0xffff) {
case 0x0100:
data->flags.crt = 1;
break;
case 0x0400:
data->flags.lcd = 1;
break;
case 0x0200:
data->flags.tvout = 1;
break;
default:
data->flags.unknown = 1;
break;
}
acpi_video_device_bind(video, data);
acpi_video_device_find_cap(data);
status = acpi_install_notify_handler(device->handle,
ACPI_DEVICE_NOTIFY,
acpi_video_device_notify,
data);
if (ACPI_FAILURE(status)) {
ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
"Error installing notify handler\n"));
if(data->brightness)
kfree(data->brightness->levels);
kfree(data->brightness);
kfree(data);
return -ENODEV;
}
down(&video->sem);
list_add_tail(&data->entry, &video->video_device_list);
up(&video->sem);
acpi_video_device_add_fs(device);
return 0;
}
return -ENOENT;
}
/*
* Arg:
* video : video bus device
*
* Return:
* none
*
* Enumerate the video device list of the video bus,
* bind the ids with the corresponding video devices
* under the video bus.
*/
static void acpi_video_device_rebind(struct acpi_video_bus *video)
{
struct list_head *node, *next;
list_for_each_safe(node, next, &video->video_device_list) {
struct acpi_video_device *dev =
container_of(node, struct acpi_video_device, entry);
acpi_video_device_bind(video, dev);
}
}
/*
* Arg:
* video : video bus device
* device : video output device under the video
* bus
*
* Return:
* none
*
* Bind the ids with the corresponding video devices
* under the video bus.
*/
static void
acpi_video_device_bind(struct acpi_video_bus *video,
struct acpi_video_device *device)
{
int i;
#define IDS_VAL(i) video->attached_array[i].value.int_val
#define IDS_BIND(i) video->attached_array[i].bind_info
for (i = 0; IDS_VAL(i) != ACPI_VIDEO_HEAD_INVALID &&
i < video->attached_count; i++) {
if (device->device_id == (IDS_VAL(i) & 0xffff)) {
IDS_BIND(i) = device;
ACPI_DEBUG_PRINT((ACPI_DB_INFO, "device_bind %d\n", i));
}
}
#undef IDS_VAL
#undef IDS_BIND
}
/*
* Arg:
* video : video bus device
*
* Return:
* < 0 : error
*
* Call _DOD to enumerate all devices attached to display adapter
*
*/
static int acpi_video_device_enumerate(struct acpi_video_bus *video)
{
int status;
int count;
int i;
struct acpi_video_enumerated_device *active_device_list;
struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
union acpi_object *dod = NULL;
union acpi_object *obj;
status = acpi_evaluate_object(video->device->handle, "_DOD", NULL, &buffer);
if (!ACPI_SUCCESS(status)) {
ACPI_EXCEPTION((AE_INFO, status, "Evaluating _DOD"));
return status;
}
dod = (union acpi_object *)buffer.pointer;
if (!dod || (dod->type != ACPI_TYPE_PACKAGE)) {
ACPI_EXCEPTION((AE_INFO, status, "Invalid _DOD data"));
status = -EFAULT;
goto out;
}
ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found %d video heads in _DOD\n",
dod->package.count));
active_device_list = kmalloc((1 +
dod->package.count) *
sizeof(struct
acpi_video_enumerated_device),
GFP_KERNEL);
if (!active_device_list) {
status = -ENOMEM;
goto out;
}
count = 0;
for (i = 0; i < dod->package.count; i++) {
obj = (union acpi_object *)&dod->package.elements[i];
if (obj->type != ACPI_TYPE_INTEGER) {
printk(KERN_ERR PREFIX "Invalid _DOD data\n");
active_device_list[i].value.int_val =
ACPI_VIDEO_HEAD_INVALID;
}
active_device_list[i].value.int_val = obj->integer.value;
active_device_list[i].bind_info = NULL;
ACPI_DEBUG_PRINT((ACPI_DB_INFO, "dod element[%d] = %d\n", i,
(int)obj->integer.value));
count++;
}
active_device_list[count].value.int_val = ACPI_VIDEO_HEAD_END;
kfree(video->attached_array);
video->attached_array = active_device_list;
video->attached_count = count;
out:
kfree(buffer.pointer);
return status;
}
/*
* Arg:
* video : video bus device
* event : Nontify Event
*
* Return:
* < 0 : error
*
* 1. Find out the current active output device.
* 2. Identify the next output device to switch
* 3. call _DSS to do actual switch.
*/
static int acpi_video_switch_output(struct acpi_video_bus *video, int event)
{
struct list_head *node, *next;
struct acpi_video_device *dev = NULL;
struct acpi_video_device *dev_next = NULL;
struct acpi_video_device *dev_prev = NULL;
unsigned long state;
int status = 0;
list_for_each_safe(node, next, &video->video_device_list) {
dev = container_of(node, struct acpi_video_device, entry);
status = acpi_video_device_get_state(dev, &state);
if (state & 0x2) {
dev_next =
container_of(node->next, struct acpi_video_device,
entry);
dev_prev =
container_of(node->prev, struct acpi_video_device,
entry);
goto out;
}
}
dev_next = container_of(node->next, struct acpi_video_device, entry);
dev_prev = container_of(node->prev, struct acpi_video_device, entry);
out:
switch (event) {
case ACPI_VIDEO_NOTIFY_CYCLE:
case ACPI_VIDEO_NOTIFY_NEXT_OUTPUT:
acpi_video_device_set_state(dev, 0);
acpi_video_device_set_state(dev_next, 0x80000001);
break;
case ACPI_VIDEO_NOTIFY_PREV_OUTPUT:
acpi_video_device_set_state(dev, 0);
acpi_video_device_set_state(dev_prev, 0x80000001);
default:
break;
}
return status;
}
static int
acpi_video_get_next_level(struct acpi_video_device *device,
u32 level_current, u32 event)
{
/*Fix me */
return level_current;
}
static void
acpi_video_switch_brightness(struct acpi_video_device *device, int event)
{
unsigned long level_current, level_next;
acpi_video_device_lcd_get_level_current(device, &level_current);
level_next = acpi_video_get_next_level(device, level_current, event);
acpi_video_device_lcd_set_level(device, level_next);
}
static int
acpi_video_bus_get_devices(struct acpi_video_bus *video,
struct acpi_device *device)
{
int status = 0;
struct list_head *node, *next;
acpi_video_device_enumerate(video);
list_for_each_safe(node, next, &device->children) {
struct acpi_device *dev =
list_entry(node, struct acpi_device, node);
if (!dev)
continue;
status = acpi_video_bus_get_one_device(dev, video);
if (ACPI_FAILURE(status)) {
ACPI_EXCEPTION((AE_INFO, status, "Cant attach device"));
continue;
}
}
return status;
}
static int acpi_video_bus_put_one_device(struct acpi_video_device *device)
{
acpi_status status;
struct acpi_video_bus *video;
if (!device || !device->video)
return -ENOENT;
video = device->video;
down(&video->sem);
list_del(&device->entry);
up(&video->sem);
acpi_video_device_remove_fs(device->dev);
status = acpi_remove_notify_handler(device->dev->handle,
ACPI_DEVICE_NOTIFY,
acpi_video_device_notify);
return 0;
}
static int acpi_video_bus_put_devices(struct acpi_video_bus *video)
{
int status;
struct list_head *node, *next;
list_for_each_safe(node, next, &video->video_device_list) {
struct acpi_video_device *data =
list_entry(node, struct acpi_video_device, entry);
if (!data)
continue;
status = acpi_video_bus_put_one_device(data);
if (ACPI_FAILURE(status))
printk(KERN_WARNING PREFIX
"hhuuhhuu bug in acpi video driver.\n");
if (data->brightness)
kfree(data->brightness->levels);
kfree(data->brightness);
kfree(data);
}
return 0;
}
/* acpi_video interface */
static int acpi_video_bus_start_devices(struct acpi_video_bus *video)
{
return acpi_video_bus_DOS(video, 1, 0);
}
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)
{
struct acpi_video_bus *video = (struct acpi_video_bus *)data;
struct acpi_device *device = NULL;
printk("video bus notify\n");
if (!video)
return;
device = video->device;
switch (event) {
case ACPI_VIDEO_NOTIFY_SWITCH: /* User request that a switch occur,
* most likely via hotkey. */
acpi_bus_generate_event(device, event, 0);
break;
case ACPI_VIDEO_NOTIFY_PROBE: /* User plug or remove a video
* connector. */
acpi_video_device_enumerate(video);
acpi_video_device_rebind(video);
acpi_video_switch_output(video, event);
acpi_bus_generate_event(device, event, 0);
break;
case ACPI_VIDEO_NOTIFY_CYCLE: /* Cycle Display output hotkey pressed. */
case ACPI_VIDEO_NOTIFY_NEXT_OUTPUT: /* Next Display output hotkey pressed. */
case ACPI_VIDEO_NOTIFY_PREV_OUTPUT: /* previous Display output hotkey pressed. */
acpi_video_switch_output(video, event);
acpi_bus_generate_event(device, event, 0);
break;
default:
ACPI_DEBUG_PRINT((ACPI_DB_INFO,
"Unsupported event [0x%x]\n", event));
break;
}
return;
}
static void acpi_video_device_notify(acpi_handle handle, u32 event, void *data)
{
struct acpi_video_device *video_device =
(struct acpi_video_device *)data;
struct acpi_device *device = NULL;
printk("video device notify\n");
if (!video_device)
return;
device = video_device->dev;
switch (event) {
case ACPI_VIDEO_NOTIFY_SWITCH: /* change in status (cycle output device) */
case ACPI_VIDEO_NOTIFY_PROBE: /* change in status (output device status) */
acpi_bus_generate_event(device, event, 0);
break;
case ACPI_VIDEO_NOTIFY_CYCLE_BRIGHTNESS: /* Cycle brightness */
case ACPI_VIDEO_NOTIFY_INC_BRIGHTNESS: /* Increase brightness */
case ACPI_VIDEO_NOTIFY_DEC_BRIGHTNESS: /* Decrease brightness */
case ACPI_VIDEO_NOTIFY_ZERO_BRIGHTNESS: /* zero brightnesss */
case ACPI_VIDEO_NOTIFY_DISPLAY_OFF: /* display device off */
acpi_video_switch_brightness(video_device, event);
acpi_bus_generate_event(device, event, 0);
break;
default:
ACPI_DEBUG_PRINT((ACPI_DB_INFO,
"Unsupported event [0x%x]\n", event));
break;
}
return;
}
static int acpi_video_bus_add(struct acpi_device *device)
{
int result = 0;
acpi_status status = 0;
struct acpi_video_bus *video = NULL;
if (!device)
return -EINVAL;
video = kmalloc(sizeof(struct acpi_video_bus), GFP_KERNEL);
if (!video)
return -ENOMEM;
memset(video, 0, sizeof(struct acpi_video_bus));
video->device = device;
strcpy(acpi_device_name(device), ACPI_VIDEO_BUS_NAME);
strcpy(acpi_device_class(device), ACPI_VIDEO_CLASS);
acpi_driver_data(device) = video;
acpi_video_bus_find_cap(video);
result = acpi_video_bus_check(video);
if (result)
goto end;
result = acpi_video_bus_add_fs(device);
if (result)
goto end;
init_MUTEX(&video->sem);
INIT_LIST_HEAD(&video->video_device_list);
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)) {
ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
"Error installing notify handler\n"));
acpi_video_bus_stop_devices(video);
acpi_video_bus_put_devices(video);
kfree(video->attached_array);
acpi_video_bus_remove_fs(device);
result = -ENODEV;
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",
video->flags.rom ? "yes" : "no",
video->flags.post ? "yes" : "no");
end:
if (result)
kfree(video);
return result;
}
static int acpi_video_bus_remove(struct acpi_device *device, int type)
{
acpi_status status = 0;
struct acpi_video_bus *video = NULL;
if (!device || !acpi_driver_data(device))
return -EINVAL;
video = (struct acpi_video_bus *)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);
kfree(video->attached_array);
kfree(video);
return 0;
}
static int
acpi_video_bus_match(struct acpi_device *device, struct acpi_driver *driver)
{
acpi_handle h_dummy1;
acpi_handle h_dummy2;
acpi_handle h_dummy3;
if (!device || !driver)
return -EINVAL;
/* Since there is no HID, CID for ACPI Video drivers, we have
* to check well known required nodes for each feature we support.
*/
/* Does this device able to support video switching ? */
if (ACPI_SUCCESS(acpi_get_handle(device->handle, "_DOD", &h_dummy1)) &&
ACPI_SUCCESS(acpi_get_handle(device->handle, "_DOS", &h_dummy2)))
return 0;
/* Does this device able to retrieve a video ROM ? */
if (ACPI_SUCCESS(acpi_get_handle(device->handle, "_ROM", &h_dummy1)))
return 0;
/* Does this device able to configure which video head to be POSTed ? */
if (ACPI_SUCCESS(acpi_get_handle(device->handle, "_VPO", &h_dummy1)) &&
ACPI_SUCCESS(acpi_get_handle(device->handle, "_GPD", &h_dummy2)) &&
ACPI_SUCCESS(acpi_get_handle(device->handle, "_SPD", &h_dummy3)))
return 0;
return -ENODEV;
}
static int __init acpi_video_init(void)
{
int result = 0;
/*
acpi_dbg_level = 0xFFFFFFFF;
acpi_dbg_layer = 0x08000000;
*/
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) {
remove_proc_entry(ACPI_VIDEO_CLASS, acpi_root_dir);
return -ENODEV;
}
return 0;
}
static void __exit acpi_video_exit(void)
{
acpi_bus_unregister_driver(&acpi_video_bus);
remove_proc_entry(ACPI_VIDEO_CLASS, acpi_root_dir);
return;
}
module_init(acpi_video_init);
module_exit(acpi_video_exit);
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