Logo Search packages:      
Sourcecode: linux version File versions  Download package

video.c

/*
 *  video.c - ACPI Video Driver ($Revision:$)
 *
 *  Copyright (C) 2004 Luming Yu <luming.yu@intel.com>
 *  Copyright (C) 2004 Bruno Ducrot <ducrot@poupinou.org>
 *  Copyright (C) 2006 Thomas Tuttle <linux-kernel@ttuttle.net>
 *
 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 *
 *  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/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 ACPI_VIDEO_HEAD_INVALID           (~0u - 1)
#define ACPI_VIDEO_HEAD_END         (~0u)
#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 acpi_video_bus_add(struct acpi_device *device);
static int acpi_video_bus_remove(struct acpi_device *device, int type);

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,
            },
};

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 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 = {
      .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_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;
      struct acpi_video_device *vd =
            (struct acpi_video_device *)bl_get_data(bd);
      acpi_video_device_lcd_get_level_current(vd, &cur_level);
      return (int) cur_level;
}

static int acpi_video_set_brightness(struct backlight_device *bd)
{
      int request_level = bd->props.brightness;
      struct acpi_video_device *vd =
            (struct acpi_video_device *)bl_get_data(bd);
      acpi_video_device_lcd_set_level(vd, 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,
};
/* --------------------------------------------------------------------------
                               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){
            unsigned long tmp;
            static int count = 0;
            char *name;
            name = kzalloc(MAX_NAME_LEN, GFP_KERNEL);
            if (!name)
                  return;

            sprintf(name, "acpi_video%d", count++);
            acpi_video_device_lcd_get_level_current(device, &tmp);
            device->backlight = backlight_device_register(name,
                  NULL, device, &acpi_backlight_ops);
            device->backlight->props.max_brightness = max_level;
            device->backlight->props.brightness = (int)tmp;
            backlight_update_status(device->backlight);

            kfree(name);
      }
      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)
            return -EFAULT;

      /* validate through 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 = 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 = 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 = 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 = 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 = 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 = 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 indicates a BIOS bug. Please contact the manufacturer.\n");
            }
            printk("%lx\n", options);
            seq_printf(seq, "can POST: <integrated 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 = 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 = 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 = file->private_data;
      struct acpi_video_bus *video = 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 'forgot' 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 = file->private_data;
      struct acpi_video_bus *video = 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 = 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 = 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 struct acpi_video_device_attrib*
acpi_video_get_device_attr(struct acpi_video_bus *video, unsigned long device_id)
{
      int count;

      for(count = 0; count < video->attached_count; count++)
            if((video->attached_array[count].value.int_val & 0xffff) == device_id)
                  return &(video->attached_array[count].value.attrib);
      return NULL;
}

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;
      struct acpi_video_device_attrib* attribute;

      if (!device || !video)
            return -EINVAL;

      status =
          acpi_evaluate_integer(device->handle, "_ADR", NULL, &device_id);
      if (ACPI_SUCCESS(status)) {

            data = kzalloc(sizeof(struct acpi_video_device), GFP_KERNEL);
            if (!data)
                  return -ENOMEM;

            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;

            attribute = acpi_video_get_device_attr(video, device_id);

            if((attribute != NULL) && attribute->device_id_scheme) {
                  switch (attribute->display_type) {
                  case ACPI_VIDEO_DISPLAY_CRT:
                        data->flags.crt = 1;
                        break;
                  case ACPI_VIDEO_DISPLAY_TV:
                        data->flags.tvout = 1;
                        break;
                  case ACPI_VIDEO_DISPLAY_DVI:
                        data->flags.dvi = 1;
                        break;
                  case ACPI_VIDEO_DISPLAY_LCD:
                        data->flags.lcd = 1;
                        break;
                  default:
                        data->flags.unknown = 1;
                        break;
                  }
                  if(attribute->bios_can_detect)
                        data->flags.bios = 1;
            } else
                  data->flags.unknown = 1;

            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;
            }

            mutex_lock(&video->device_list_lock);
            list_add_tail(&data->entry, &video->video_device_list);
            mutex_unlock(&video->device_list_lock);

            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 acpi_video_device *dev;

      mutex_lock(&video->device_list_lock);

      list_for_each_entry(dev, &video->video_device_list, entry)
            acpi_video_device_bind(video, dev);

      mutex_unlock(&video->device_list_lock);
}

/*
 *  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 = 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 = &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 : notify event
 *
 *  Return:
 *    < 0   : error
 *  
 *    1. Find out the current active output device.
 *    2. Identify the next output device to switch to.
 *    3. call _DSS to do actual switch.
 */

static int acpi_video_switch_output(struct acpi_video_bus *video, int event)
{
      struct list_head *node;
      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;

      mutex_lock(&video->device_list_lock);

      list_for_each(node, &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:
      mutex_unlock(&video->device_list_lock);

      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)
{
      int min, max, min_above, max_below, i, l, delta = 255;
      max = max_below = 0;
      min = min_above = 255;
      /* Find closest level to level_current */
      for (i = 0; i < device->brightness->count; i++) {
            l = device->brightness->levels[i];
            if (abs(l - level_current) < abs(delta)) {
                  delta = l - level_current;
                  if (!delta)
                        break;
            }
      }
      /* Ajust level_current to closest available level */
      level_current += delta;
      for (i = 0; i < device->brightness->count; i++) {
            l = device->brightness->levels[i];
            if (l < min)
                  min = l;
            if (l > max)
                  max = l;
            if (l < min_above && l > level_current)
                  min_above = l;
            if (l > max_below && l < level_current)
                  max_below = l;
      }

      switch (event) {
      case ACPI_VIDEO_NOTIFY_CYCLE_BRIGHTNESS:
            return (level_current < max) ? min_above : min;
      case ACPI_VIDEO_NOTIFY_INC_BRIGHTNESS:
            return (level_current < max) ? min_above : max;
      case ACPI_VIDEO_NOTIFY_DEC_BRIGHTNESS:
            return (level_current > min) ? max_below : min;
      case ACPI_VIDEO_NOTIFY_ZERO_BRIGHTNESS:
      case ACPI_VIDEO_NOTIFY_DISPLAY_OFF:
            return 0;
      default:
            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 acpi_device *dev;

      acpi_video_device_enumerate(video);

      list_for_each_entry(dev, &device->children, node) {

            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;

      acpi_video_device_remove_fs(device->dev);

      status = acpi_remove_notify_handler(device->dev->handle,
                                  ACPI_DEVICE_NOTIFY,
                                  acpi_video_device_notify);
      backlight_device_unregister(device->backlight);
      video_output_unregister(device->output_dev);

      return 0;
}

static int acpi_video_bus_put_devices(struct acpi_video_bus *video)
{
      int status;
      struct acpi_video_device *dev, *next;

      mutex_lock(&video->device_list_lock);

      list_for_each_entry_safe(dev, next, &video->video_device_list, entry) {

            status = acpi_video_bus_put_one_device(dev);
            if (ACPI_FAILURE(status))
                  printk(KERN_WARNING PREFIX
                         "hhuuhhuu bug in acpi video driver.\n");

            if (dev->brightness) {
                  kfree(dev->brightness->levels);
                  kfree(dev->brightness);
            }
            list_del(&dev->entry);
            kfree(dev);
      }

      mutex_unlock(&video->device_list_lock);

      return 0;
}

/* acpi_video interface */

static int acpi_video_bus_start_devices(struct acpi_video_bus *video)
{
      return acpi_video_bus_DOS(video, 0, 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 = data;
      struct acpi_device *device = NULL;
      struct input_dev *input;
      int keycode;

      if (!video)
            return;

      device = video->device;
      input = video->input;

      switch (event) {
      case ACPI_VIDEO_NOTIFY_SWITCH:      /* User requested a switch,
                               * most likely via hotkey. */
            acpi_bus_generate_proc_event(device, event, 0);
            keycode = KEY_SWITCHVIDEOMODE;
            break;

      case ACPI_VIDEO_NOTIFY_PROBE: /* User plugged in or removed a video
                               * connector. */
            acpi_video_device_enumerate(video);
            acpi_video_device_rebind(video);
            acpi_video_switch_output(video, event);
            acpi_bus_generate_proc_event(device, event, 0);
            keycode = KEY_SWITCHVIDEOMODE;
            break;

      case ACPI_VIDEO_NOTIFY_CYCLE: /* Cycle Display output hotkey pressed. */
            acpi_video_switch_output(video, event);
            acpi_bus_generate_proc_event(device, event, 0);
            keycode = KEY_SWITCHVIDEOMODE;
            break;
      case ACPI_VIDEO_NOTIFY_NEXT_OUTPUT: /* Next Display output hotkey pressed. */
            acpi_video_switch_output(video, event);
            acpi_bus_generate_proc_event(device, event, 0);
            keycode = KEY_VIDEO_NEXT;
            break;
      case ACPI_VIDEO_NOTIFY_PREV_OUTPUT: /* previous Display output hotkey pressed. */
            acpi_video_switch_output(video, event);
            acpi_bus_generate_proc_event(device, event, 0);
            keycode = KEY_VIDEO_PREV;
            break;

      default:
            keycode = KEY_UNKNOWN;
            ACPI_DEBUG_PRINT((ACPI_DB_INFO,
                          "Unsupported event [0x%x]\n", event));
            break;
      }

      input_report_key(input, keycode, 1);
      input_sync(input);
      input_report_key(input, keycode, 0);
      input_sync(input);

      return;
}

static void acpi_video_device_notify(acpi_handle handle, u32 event, void *data)
{
      struct acpi_video_device *video_device = data;
      struct acpi_device *device = NULL;
      struct acpi_video_bus *bus;
      struct input_dev *input;
      int keycode;

      if (!video_device)
            return;

      device = video_device->dev;
      bus = video_device->video;
      input = bus->input;

      switch (event) {
      case ACPI_VIDEO_NOTIFY_CYCLE_BRIGHTNESS:  /* Cycle brightness */
            acpi_video_switch_brightness(video_device, event);
            acpi_bus_generate_proc_event(device, event, 0);
            keycode = KEY_BRIGHTNESS_CYCLE;
            break;
      case ACPI_VIDEO_NOTIFY_INC_BRIGHTNESS:    /* Increase brightness */
            acpi_video_switch_brightness(video_device, event);
            acpi_bus_generate_proc_event(device, event, 0);
            keycode = KEY_BRIGHTNESSUP;
            break;
      case ACPI_VIDEO_NOTIFY_DEC_BRIGHTNESS:    /* Decrease brightness */
            acpi_video_switch_brightness(video_device, event);
            acpi_bus_generate_proc_event(device, event, 0);
            keycode = KEY_BRIGHTNESSDOWN;
            break;
      case ACPI_VIDEO_NOTIFY_ZERO_BRIGHTNESS:   /* zero brightnesss */
            acpi_video_switch_brightness(video_device, event);
            acpi_bus_generate_proc_event(device, event, 0);
            keycode = KEY_BRIGHTNESS_ZERO;
            break;
      case ACPI_VIDEO_NOTIFY_DISPLAY_OFF: /* display device off */
            acpi_video_switch_brightness(video_device, event);
            acpi_bus_generate_proc_event(device, event, 0);
            keycode = KEY_DISPLAY_OFF;
            break;
      default:
            keycode = KEY_UNKNOWN;
            ACPI_DEBUG_PRINT((ACPI_DB_INFO,
                          "Unsupported event [0x%x]\n", event));
            break;
      }

      input_report_key(input, keycode, 1);
      input_sync(input);
      input_report_key(input, keycode, 0);
      input_sync(input);

      return;
}

static int instance;
static int acpi_video_bus_add(struct acpi_device *device)
{
      acpi_status status;
      struct acpi_video_bus *video;
      struct input_dev *input;
      int error;

      video = kzalloc(sizeof(struct acpi_video_bus), GFP_KERNEL);
      if (!video)
            return -ENOMEM;

      /* a hack to fix the duplicate name "VID" problem on T61 */
      if (!strcmp(device->pnp.bus_id, "VID")) {
            if (instance)
                  device->pnp.bus_id[3] = '0' + instance;
            instance ++;
      }

      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);
      error = acpi_video_bus_check(video);
      if (error)
            goto err_free_video;

      error = acpi_video_bus_add_fs(device);
      if (error)
            goto err_free_video;

      mutex_init(&video->device_list_lock);
      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"));
            error = -ENODEV;
            goto err_stop_video;
      }

      video->input = input = input_allocate_device();
      if (!input) {
            error = -ENOMEM;
            goto err_uninstall_notify;
      }

      snprintf(video->phys, sizeof(video->phys),
            "%s/video/input0", acpi_device_hid(video->device));

      input->name = acpi_device_name(video->device);
      input->phys = video->phys;
      input->id.bustype = BUS_HOST;
      input->id.product = 0x06;
      input->dev.parent = &device->dev;
      input->evbit[0] = BIT(EV_KEY);
      set_bit(KEY_SWITCHVIDEOMODE, input->keybit);
      set_bit(KEY_VIDEO_NEXT, input->keybit);
      set_bit(KEY_VIDEO_PREV, input->keybit);
      set_bit(KEY_BRIGHTNESS_CYCLE, input->keybit);
      set_bit(KEY_BRIGHTNESSUP, input->keybit);
      set_bit(KEY_BRIGHTNESSDOWN, input->keybit);
      set_bit(KEY_BRIGHTNESS_ZERO, input->keybit);
      set_bit(KEY_DISPLAY_OFF, input->keybit);
      set_bit(KEY_UNKNOWN, input->keybit);

      error = input_register_device(input);
      if (error)
            goto err_free_input_dev;

      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");

      return 0;

 err_free_input_dev:
      input_free_device(input);
 err_uninstall_notify:
      acpi_remove_notify_handler(device->handle, ACPI_DEVICE_NOTIFY,
                           acpi_video_bus_notify);
 err_stop_video:
      acpi_video_bus_stop_devices(video);
      acpi_video_bus_put_devices(video);
      kfree(video->attached_array);
      acpi_video_bus_remove_fs(device);
 err_free_video:
      kfree(video);
      acpi_driver_data(device) = NULL;

      return error;
}

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 = 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);

      input_unregister_device(video->input);
      kfree(video->attached_array);
      kfree(video);

      return 0;
}

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);

Generated by  Doxygen 1.6.0   Back to index