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video.c
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/*
* video.c - ACPI Video Driver ($Revision:$)
*
* Copyright (C) 2004 Luming Yu <[email protected]>
* Copyright (C) 2004 Bruno Ducrot <[email protected]>
* Copyright (C) 2006 Thomas Tuttle <[email protected]>
*
* ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
*
* 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/mutex.h>
#include <linux/proc_fs.h>
#include <linux/seq_file.h>
#include <linux/input.h>
#include <linux/backlight.h>
#include <linux/thermal.h>
#include <linux/video_output.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_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 0x85
#define ACPI_VIDEO_NOTIFY_INC_BRIGHTNESS 0x86
#define ACPI_VIDEO_NOTIFY_DEC_BRIGHTNESS 0x87
#define ACPI_VIDEO_NOTIFY_ZERO_BRIGHTNESS 0x88
#define ACPI_VIDEO_NOTIFY_DISPLAY_OFF 0x89
#define MAX_NAME_LEN 20
#define ACPI_VIDEO_DISPLAY_CRT 1
#define ACPI_VIDEO_DISPLAY_TV 2
#define ACPI_VIDEO_DISPLAY_DVI 3
#define ACPI_VIDEO_DISPLAY_LCD 4
#define _COMPONENT ACPI_VIDEO_COMPONENT
ACPI_MODULE_NAME("video");
MODULE_AUTHOR("Bruno Ducrot");
MODULE_DESCRIPTION("ACPI Video Driver");
MODULE_LICENSE("GPL");
static int brightness_switch_enabled = 1;
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 const struct acpi_device_id video_device_ids[] = {
{ACPI_VIDEO_HID, 0},
{"", 0},
};
MODULE_DEVICE_TABLE(acpi, video_device_ids);
static struct acpi_driver acpi_video_bus = {
.name = "video",
.class = ACPI_VIDEO_CLASS,
.ids = video_device_ids,
.ops = {
.add = acpi_video_bus_add,
.remove = acpi_video_bus_remove,
.resume = acpi_video_resume,
},
};
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 differentiates the display type */
u32 display_type:4; /*Describe the specific type in use */
u32 vendor_specific:4; /*Chipset Vendor Specific */
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 list_head video_device_list;
struct mutex device_list_lock; /* protects video_device_list */
struct proc_dir_entry *dir;
struct input_dev *input;
char phys[32]; /* for input device */
};
struct acpi_video_device_flags {
u8 crt:1;
u8 lcd:1;
u8 tvout:1;
u8 dvi:1;
u8 bios:1;
u8 unknown:1;
u8 reserved:2;
};
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 _BQC:1; /* Get current 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 */
};
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;
struct backlight_device *backlight;
struct thermal_cooling_device *cdev;
struct output_device *output_dev;
};
/* bus */
static int acpi_video_bus_info_open_fs(struct inode *inode, struct file *file);
static struct file_operations acpi_video_bus_info_fops = {
.owner = THIS_MODULE,
.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 = {
.owner = THIS_MODULE,
.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 = {
.owner = THIS_MODULE,
.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 = {
.owner = THIS_MODULE,
.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 = {
.owner = THIS_MODULE,
.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 = {
.owner = THIS_MODULE,
.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 = {
.owner = THIS_MODULE,
.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 = {
.owner = THIS_MODULE,
.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 = {
.owner = THIS_MODULE,
.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_device_lcd_set_level(struct acpi_video_device *device,
int level);
static int acpi_video_device_lcd_get_level_current(
struct acpi_video_device *device,
unsigned 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,
int event);
static int acpi_video_device_get_state(struct acpi_video_device *device,
unsigned long *state);
static int acpi_video_output_get(struct output_device *od);
static int acpi_video_device_set_state(struct acpi_video_device *device, int state);
/*backlight device sysfs support*/
static int acpi_video_get_brightness(struct backlight_device *bd)
{
unsigned long cur_level;
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);
for (i = 2; i < vd->brightness->count; i++) {
if (vd->brightness->levels[i] == cur_level)
/* The first two entries are special - see page 575
of the ACPI spec 3.0 */
return i-2;
}
return 0;
}
static int acpi_video_set_brightness(struct backlight_device *bd)
{
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;
}
static struct backlight_ops acpi_backlight_ops = {
.get_brightness = acpi_video_get_brightness,
.update_status = acpi_video_set_brightness,
};
/*video output device sysfs support*/
static int acpi_video_output_get(struct output_device *od)
{
unsigned long state;
struct acpi_video_device *vd =
(struct acpi_video_device *)dev_get_drvdata(&od->dev);
acpi_video_device_get_state(vd, &state);
return (int)state;
}
static int acpi_video_output_set(struct output_device *od)
{
unsigned long state = od->request_state;
struct acpi_video_device *vd=
(struct acpi_video_device *)dev_get_drvdata(&od->dev);
return acpi_video_device_set_state(vd, state);
}
static struct output_properties acpi_output_properties = {
.set_state = acpi_video_output_set,
.get_status = acpi_video_output_get,
};
/* thermal cooling device callbacks */
static int video_get_max_state(struct thermal_cooling_device *cdev, char *buf)
{
struct acpi_device *device = cdev->devdata;
struct acpi_video_device *video = acpi_driver_data(device);
return sprintf(buf, "%d\n", video->brightness->count - 3);
}
static int video_get_cur_state(struct thermal_cooling_device *cdev, char *buf)
{
struct acpi_device *device = cdev->devdata;
struct acpi_video_device *video = acpi_driver_data(device);
unsigned long level;
int state;
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);
return -EINVAL;
}
static int
video_set_cur_state(struct thermal_cooling_device *cdev, unsigned int state)
{
struct acpi_device *device = cdev->devdata;
struct acpi_video_device *video = acpi_driver_data(device);
int level;
if ( state >= video->brightness->count - 2)
return -EINVAL;
state = video->brightness->count - state;
level = video->brightness->levels[state -1];
return acpi_video_device_lcd_set_level(video, level);
}
static struct thermal_cooling_device_ops video_cooling_ops = {
.get_max_state = video_get_max_state,
.get_cur_state = video_get_cur_state,
.set_cur_state = video_set_cur_state,
};
/* --------------------------------------------------------------------------
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 = AE_OK;
union acpi_object arg0 = { ACPI_TYPE_INTEGER };
struct acpi_object_list args = { 1, &arg0 };
arg0.integer.value = level;
if (device->cap._BCM)
status = acpi_evaluate_object(device->dev->handle, "_BCM",
&args, NULL);
device->brightness->curr = level;
return status;
}
static int
acpi_video_device_lcd_get_level_current(struct acpi_video_device *device,
unsigned long *level)
{
if (device->cap._BQC)
return acpi_evaluate_integer(device->dev->handle, "_BQC", NULL,
level);
*level = device->brightness->curr;
return AE_OK;
}
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 = 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 switch 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 methods defined under the output
* device.
*/
static void acpi_video_device_find_cap(struct acpi_video_device *device)
{
acpi_handle h_dummy1;
int i;
u32 max_level = 0;
union acpi_object *obj = NULL;
struct acpi_video_device_brightness *br = NULL;
memset(&device->cap, 0, sizeof(device->cap));
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,"_BQC",&h_dummy1)))
device->cap._BQC = 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;
}
if (ACPI_SUCCESS(acpi_video_device_lcd_query_levels(device, &obj))) {
if (obj->package.count >= 2) {
int count = 0;
union acpi_object *o;
br = kzalloc(sizeof(*br), GFP_KERNEL);
if (!br) {
printk(KERN_ERR "can't allocate memory\n");
} else {
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;
if (br->levels[count] > max_level)
max_level = br->levels[count];
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));
}
}
}
} else {
ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Could not query available LCD brightness level\n"));
}
kfree(obj);
if (device->cap._BCL && device->cap._BCM && device->cap._BQC && max_level > 0){
int result;
static int count = 0;
char *name;
name = kzalloc(MAX_NAME_LEN, GFP_KERNEL);
if (!name)
return;
sprintf(name, "acpi_video%d", count++);
device->backlight = backlight_device_register(name,
NULL, device, &acpi_backlight_ops);
device->backlight->props.max_brightness = device->brightness->count-3;
device->backlight->props.brightness = acpi_video_get_brightness(device->backlight);
backlight_update_status(device->backlight);
kfree(name);
device->cdev = thermal_cooling_device_register("LCD",
device->dev, &video_cooling_ops);
if (IS_ERR(device->cdev))
return;
printk(KERN_INFO PREFIX
"%s is registered as cooling_device%d\n",
device->dev->dev.bus_id, device->cdev->id);
result = sysfs_create_link(&device->dev->dev.kobj,
&device->cdev->device.kobj,
"thermal_cooling");
if (result)
printk(KERN_ERR PREFIX "Create sysfs link\n");
result = sysfs_create_link(&device->cdev->device.kobj,
&device->dev->dev.kobj, "device");
if (result)
printk(KERN_ERR PREFIX "Create sysfs link\n");
}
if (device->cap._DCS && device->cap._DSS){
static int count = 0;
char *name;
name = kzalloc(MAX_NAME_LEN, GFP_KERNEL);
if (!name)
return;
sprintf(name, "acpi_video%d", count++);
device->output_dev = video_output_register(name,
NULL, device, &acpi_output_properties);
kfree(name);
}
return;
}
/*
* Arg:
* device : video output device (VGA)
*
* Return Value:
* None
*
* Find out all required AML methods 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, sizeof(video->cap));
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 support video switching? */
if (video->cap._DOS) {
video->flags.multihead = 1;
status = 0;
}
/* Does this device support retrieving a video ROM? */
if (video->cap._ROM) {
video->flags.rom = 1;
status = 0;
}
/* Does this device support configuring 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 = 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 if (dev->flags.dvi)
seq_printf(seq, "DVI\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 = 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 = file->private_data;
struct acpi_video_device *dev = 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 = 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 = file->private_data;
struct acpi_video_device *dev = m->private;
char str[5] = { 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)