/*

   *  Copyright (C) 1997-1998	Mark Lord

   *  Copyright (C) 2003		Red Hat

   *
   *  Some code was moved here from ide.c, see it for original copyrights.

   */
  
  /*
   * This is the /proc/ide/ filesystem implementation.
   *
   * Drive/Driver settings can be retrieved by reading the drive's
   * "settings" files.  e.g.    "cat /proc/ide0/hda/settings"
   * To write a new value "val" into a specific setting "name", use:
   *   echo "name:val" >/proc/ide/ide0/hda/settings

   */

  #include <linux/module.h>
  
  #include <asm/uaccess.h>
  #include <linux/errno.h>

  #include <linux/proc_fs.h>
  #include <linux/stat.h>
  #include <linux/mm.h>
  #include <linux/pci.h>
  #include <linux/ctype.h>

  #include <linux/ide.h>
  #include <linux/seq_file.h>

  #include <linux/slab.h>

  
  #include <asm/io.h>

  static struct proc_dir_entry *proc_ide_root;

  static int ide_imodel_proc_show(struct seq_file *m, void *v)

  {

  	ide_hwif_t	*hwif = (ide_hwif_t *) m->private;

  	const char	*name;

  	switch (hwif->chipset) {

  	case ide_generic:	name = "generic";	break;
  	case ide_pci:		name = "pci";		break;
  	case ide_cmd640:	name = "cmd640";	break;
  	case ide_dtc2278:	name = "dtc2278";	break;
  	case ide_ali14xx:	name = "ali14xx";	break;
  	case ide_qd65xx:	name = "qd65xx";	break;
  	case ide_umc8672:	name = "umc8672";	break;
  	case ide_ht6560b:	name = "ht6560b";	break;

  	case ide_4drives:	name = "4drives";	break;
  	case ide_pmac:		name = "mac-io";	break;
  	case ide_au1xxx:	name = "au1xxx";	break;
  	case ide_palm3710:      name = "palm3710";      break;

  	case ide_acorn:		name = "acorn";		break;
  	default:		name = "(unknown)";	break;

  	}

  	seq_printf(m, "%s
  ", name);
  	return 0;

  }

  static int ide_imodel_proc_open(struct inode *inode, struct file *file)

  {

  	return single_open(file, ide_imodel_proc_show, PDE(inode)->data);
  }
  
  static const struct file_operations ide_imodel_proc_fops = {
  	.owner		= THIS_MODULE,
  	.open		= ide_imodel_proc_open,
  	.read		= seq_read,
  	.llseek		= seq_lseek,
  	.release	= single_release,
  };
  
  static int ide_mate_proc_show(struct seq_file *m, void *v)
  {
  	ide_hwif_t	*hwif = (ide_hwif_t *) m->private;

  	if (hwif && hwif->mate)

  		seq_printf(m, "%s
  ", hwif->mate->name);

  	else

  		seq_printf(m, "(none)
  ");
  	return 0;

  }

  static int ide_mate_proc_open(struct inode *inode, struct file *file)

  {

  	return single_open(file, ide_mate_proc_show, PDE(inode)->data);
  }

  static const struct file_operations ide_mate_proc_fops = {
  	.owner		= THIS_MODULE,
  	.open		= ide_mate_proc_open,
  	.read		= seq_read,
  	.llseek		= seq_lseek,
  	.release	= single_release,
  };
  
  static int ide_channel_proc_show(struct seq_file *m, void *v)
  {
  	ide_hwif_t	*hwif = (ide_hwif_t *) m->private;
  
  	seq_printf(m, "%c
  ", hwif->channel ? '1' : '0');
  	return 0;

  }

  static int ide_channel_proc_open(struct inode *inode, struct file *file)

  {

  	return single_open(file, ide_channel_proc_show, PDE(inode)->data);
  }
  
  static const struct file_operations ide_channel_proc_fops = {
  	.owner		= THIS_MODULE,
  	.open		= ide_channel_proc_open,
  	.read		= seq_read,
  	.llseek		= seq_lseek,
  	.release	= single_release,
  };

  static int ide_identify_proc_show(struct seq_file *m, void *v)
  {
  	ide_drive_t *drive = (ide_drive_t *)m->private;
  	u8 *buf;

  	if (!drive) {
  		seq_putc(m, '
  ');
  		return 0;
  	}

  	buf = kmalloc(SECTOR_SIZE, GFP_KERNEL);
  	if (!buf)
  		return -ENOMEM;
  	if (taskfile_lib_get_identify(drive, buf) == 0) {
  		__le16 *val = (__le16 *)buf;
  		int i;

  		for (i = 0; i < SECTOR_SIZE / 2; i++) {
  			seq_printf(m, "%04x%c", le16_to_cpu(val[i]),
  					(i % 8) == 7 ? '
  ' : ' ');

  		}

  	} else
  		seq_putc(m, buf[0]);
  	kfree(buf);
  	return 0;

  }

  static int ide_identify_proc_open(struct inode *inode, struct file *file)
  {
  	return single_open(file, ide_identify_proc_show, PDE(inode)->data);
  }
  
  static const struct file_operations ide_identify_proc_fops = {
  	.owner		= THIS_MODULE,
  	.open		= ide_identify_proc_open,
  	.read		= seq_read,
  	.llseek		= seq_lseek,
  	.release	= single_release,
  };

  /**

   *	ide_find_setting	-	find a specific setting
   *	@st: setting table pointer

   *	@name: setting name

   *

   *	Scan's the setting table for a matching entry and returns

   *	this or NULL if no entry is found. The caller must hold the
   *	setting semaphore
   */

  static
  const struct ide_proc_devset *ide_find_setting(const struct ide_proc_devset *st,
  					       char *name)

  {

  	while (st->name) {
  		if (strcmp(st->name, name) == 0)

  			break;

  		st++;

  	}

  	return st->name ? st : NULL;

  }
  
  /**
   *	ide_read_setting	-	read an IDE setting
   *	@drive: drive to read from
   *	@setting: drive setting
   *
   *	Read a drive setting and return the value. The caller

   *	must hold the ide_setting_mtx when making this call.

   *
   *	BUGS: the data return and error are the same return value
   *	so an error -EINVAL and true return of the same value cannot
   *	be told apart
   */

  static int ide_read_setting(ide_drive_t *drive,

  			    const struct ide_proc_devset *setting)

  {

  	const struct ide_devset *ds = setting->setting;

  	int val = -EINVAL;

  	if (ds->get)

  		val = ds->get(drive);

  	return val;
  }
  
  /**
   *	ide_write_setting	-	read an IDE setting
   *	@drive: drive to read from
   *	@setting: drive setting
   *	@val: value
   *
   *	Write a drive setting if it is possible. The caller

   *	must hold the ide_setting_mtx when making this call.

   *
   *	BUGS: the data return and error are the same return value
   *	so an error -EINVAL and true return of the same value cannot
   *	be told apart
   *
   *	FIXME:  This should be changed to enqueue a special request
   *	to the driver to change settings, and then wait on a sema for completion.
   *	The current scheme of polling is kludgy, though safe enough.
   */

  static int ide_write_setting(ide_drive_t *drive,

  			     const struct ide_proc_devset *setting, int val)

  {

  	const struct ide_devset *ds = setting->setting;

  	if (!capable(CAP_SYS_ADMIN))
  		return -EACCES;

  	if (!ds->set)

  		return -EPERM;

  	if ((ds->flags & DS_SYNC)
  	    && (val < setting->min || val > setting->max))

  		return -EINVAL;

  	return ide_devset_execute(drive, ds, val);

  }

  ide_devset_get(xfer_rate, current_speed);

  static int set_xfer_rate (ide_drive_t *drive, int arg)
  {

  	struct ide_cmd cmd;

  	if (arg < XFER_PIO_0 || arg > XFER_UDMA_6)

  		return -EINVAL;

  	memset(&cmd, 0, sizeof(cmd));
  	cmd.tf.command = ATA_CMD_SET_FEATURES;
  	cmd.tf.feature = SETFEATURES_XFER;
  	cmd.tf.nsect   = (u8)arg;

  	cmd.valid.out.tf = IDE_VALID_FEATURE | IDE_VALID_NSECT;
  	cmd.valid.in.tf  = IDE_VALID_NSECT;

  	cmd.tf_flags   = IDE_TFLAG_SET_XFER;

  	return ide_no_data_taskfile(drive, &cmd);

  }

  ide_devset_rw(current_speed, xfer_rate);
  ide_devset_rw_field(init_speed, init_speed);

  ide_devset_rw_flag(nice1, IDE_DFLAG_NICE1);

  ide_devset_rw_field(number, dn);
  
  static const struct ide_proc_devset ide_generic_settings[] = {
  	IDE_PROC_DEVSET(current_speed, 0, 70),
  	IDE_PROC_DEVSET(init_speed, 0, 70),
  	IDE_PROC_DEVSET(io_32bit,  0, 1 + (SUPPORT_VLB_SYNC << 1)),
  	IDE_PROC_DEVSET(keepsettings, 0, 1),
  	IDE_PROC_DEVSET(nice1, 0, 1),
  	IDE_PROC_DEVSET(number, 0, 3),
  	IDE_PROC_DEVSET(pio_mode, 0, 255),
  	IDE_PROC_DEVSET(unmaskirq, 0, 1),
  	IDE_PROC_DEVSET(using_dma, 0, 1),

  	{ NULL },

  };

  static void proc_ide_settings_warn(void)
  {

  	printk_once(KERN_WARNING "Warning: /proc/ide/hd?/settings interface is "

  			    "obsolete, and will be removed soon!
  ");

  }

  static int ide_settings_proc_show(struct seq_file *m, void *v)

  {

  	const struct ide_proc_devset *setting, *g, *d;
  	const struct ide_devset *ds;

  	ide_drive_t	*drive = (ide_drive_t *) m->private;
  	int		rc, mul_factor, div_factor;

  
  	proc_ide_settings_warn();

  	mutex_lock(&ide_setting_mtx);

  	g = ide_generic_settings;
  	d = drive->settings;

  	seq_printf(m, "name\t\t\tvalue\t\tmin\t\tmax\t\tmode
  ");
  	seq_printf(m, "----\t\t\t-----\t\t---\t\t---\t\t----
  ");

  	while (g->name || (d && d->name)) {

  		/* read settings in the alphabetical order */

  		if (g->name && d && d->name) {
  			if (strcmp(d->name, g->name) < 0)
  				setting = d++;

  			else

  				setting = g++;
  		} else if (d && d->name) {
  			setting = d++;

  		} else

  			setting = g++;

  		mul_factor = setting->mulf ? setting->mulf(drive) : 1;
  		div_factor = setting->divf ? setting->divf(drive) : 1;

  		seq_printf(m, "%-24s", setting->name);

  		rc = ide_read_setting(drive, setting);
  		if (rc >= 0)

  			seq_printf(m, "%-16d", rc * mul_factor / div_factor);

  		else

  			seq_printf(m, "%-16s", "write-only");
  		seq_printf(m, "%-16d%-16d", (setting->min * mul_factor + div_factor - 1) / div_factor, setting->max * mul_factor / div_factor);

  		ds = setting->setting;
  		if (ds->get)

  			seq_printf(m, "r");

  		if (ds->set)

  			seq_printf(m, "w");
  		seq_printf(m, "
  ");

  	}

  	mutex_unlock(&ide_setting_mtx);

  	return 0;
  }
  
  static int ide_settings_proc_open(struct inode *inode, struct file *file)
  {
  	return single_open(file, ide_settings_proc_show, PDE(inode)->data);

  }
  
  #define MAX_LEN	30

  static ssize_t ide_settings_proc_write(struct file *file, const char __user *buffer,
  				       size_t count, loff_t *pos)

  {

  	ide_drive_t	*drive = (ide_drive_t *) PDE(file->f_path.dentry->d_inode)->data;

  	char		name[MAX_LEN + 1];

  	int		for_real = 0, mul_factor, div_factor;

  	unsigned long	n;

  	const struct ide_proc_devset *setting;

  	char *buf, *s;
  
  	if (!capable(CAP_SYS_ADMIN))
  		return -EACCES;
  
  	proc_ide_settings_warn();
  
  	if (count >= PAGE_SIZE)
  		return -EINVAL;
  
  	s = buf = (char *)__get_free_page(GFP_USER);
  	if (!buf)
  		return -ENOMEM;
  
  	if (copy_from_user(buf, buffer, count)) {
  		free_page((unsigned long)buf);
  		return -EFAULT;
  	}
  
  	buf[count] = '\0';
  
  	/*
  	 * Skip over leading whitespace
  	 */
  	while (count && isspace(*s)) {
  		--count;
  		++s;
  	}
  	/*
  	 * Do one full pass to verify all parameters,
  	 * then do another to actually write the new settings.
  	 */
  	do {
  		char *p = s;
  		n = count;
  		while (n > 0) {
  			unsigned val;
  			char *q = p;
  
  			while (n > 0 && *p != ':') {
  				--n;
  				p++;
  			}
  			if (*p != ':')
  				goto parse_error;
  			if (p - q > MAX_LEN)
  				goto parse_error;
  			memcpy(name, q, p - q);
  			name[p - q] = 0;
  
  			if (n > 0) {
  				--n;
  				p++;
  			} else
  				goto parse_error;
  
  			val = simple_strtoul(p, &q, 10);
  			n -= q - p;
  			p = q;
  			if (n > 0 && !isspace(*p))
  				goto parse_error;
  			while (n > 0 && isspace(*p)) {
  				--n;
  				++p;
  			}

  			mutex_lock(&ide_setting_mtx);

  			/* generic settings first, then driver specific ones */
  			setting = ide_find_setting(ide_generic_settings, name);

  			if (!setting) {

  				if (drive->settings)
  					setting = ide_find_setting(drive->settings, name);
  				if (!setting) {
  					mutex_unlock(&ide_setting_mtx);
  					goto parse_error;
  				}
  			}
  			if (for_real) {
  				mul_factor = setting->mulf ? setting->mulf(drive) : 1;
  				div_factor = setting->divf ? setting->divf(drive) : 1;
  				ide_write_setting(drive, setting, val * div_factor / mul_factor);

  			}

  			mutex_unlock(&ide_setting_mtx);

  		}
  	} while (!for_real++);
  	free_page((unsigned long)buf);
  	return count;
  parse_error:
  	free_page((unsigned long)buf);

  	printk("%s(): parse error
  ", __func__);

  	return -EINVAL;
  }

  static const struct file_operations ide_settings_proc_fops = {
  	.owner		= THIS_MODULE,
  	.open		= ide_settings_proc_open,
  	.read		= seq_read,
  	.llseek		= seq_lseek,
  	.release	= single_release,
  	.write		= ide_settings_proc_write,
  };
  
  static int ide_capacity_proc_show(struct seq_file *m, void *v)

  {

  	seq_printf(m, "%llu
  ", (long long)0x7fffffff);
  	return 0;

  }

  static int ide_capacity_proc_open(struct inode *inode, struct file *file)
  {
  	return single_open(file, ide_capacity_proc_show, NULL);
  }
  
  const struct file_operations ide_capacity_proc_fops = {
  	.owner		= THIS_MODULE,
  	.open		= ide_capacity_proc_open,
  	.read		= seq_read,
  	.llseek		= seq_lseek,
  	.release	= single_release,
  };
  EXPORT_SYMBOL_GPL(ide_capacity_proc_fops);

  static int ide_geometry_proc_show(struct seq_file *m, void *v)

  {

  	ide_drive_t	*drive = (ide_drive_t *) m->private;

  	seq_printf(m, "physical     %d/%d/%d
  ",

  			drive->cyl, drive->head, drive->sect);

  	seq_printf(m, "logical      %d/%d/%d
  ",

  			drive->bios_cyl, drive->bios_head, drive->bios_sect);

  	return 0;
  }

  static int ide_geometry_proc_open(struct inode *inode, struct file *file)
  {
  	return single_open(file, ide_geometry_proc_show, PDE(inode)->data);

  }

  const struct file_operations ide_geometry_proc_fops = {
  	.owner		= THIS_MODULE,
  	.open		= ide_geometry_proc_open,
  	.read		= seq_read,
  	.llseek		= seq_lseek,
  	.release	= single_release,
  };
  EXPORT_SYMBOL(ide_geometry_proc_fops);

  static int ide_dmodel_proc_show(struct seq_file *seq, void *v)

  {

  	ide_drive_t	*drive = (ide_drive_t *) seq->private;

  	char		*m = (char *)&drive->id[ATA_ID_PROD];

  	seq_printf(seq, "%.40s
  ", m[0] ? m : "(none)");
  	return 0;

  }

  static int ide_dmodel_proc_open(struct inode *inode, struct file *file)

  {

  	return single_open(file, ide_dmodel_proc_show, PDE(inode)->data);
  }
  
  static const struct file_operations ide_dmodel_proc_fops = {
  	.owner		= THIS_MODULE,
  	.open		= ide_dmodel_proc_open,
  	.read		= seq_read,
  	.llseek		= seq_lseek,
  	.release	= single_release,
  };
  
  static int ide_driver_proc_show(struct seq_file *m, void *v)
  {
  	ide_drive_t		*drive = (ide_drive_t *)m->private;

  	struct device		*dev = &drive->gendev;
  	struct ide_driver	*ide_drv;

  	if (dev->driver) {

  		ide_drv = to_ide_driver(dev->driver);

  		seq_printf(m, "%s version %s
  ",

  				dev->driver->name, ide_drv->version);

  	} else

  		seq_printf(m, "ide-default version 0.9.newide
  ");
  	return 0;
  }
  
  static int ide_driver_proc_open(struct inode *inode, struct file *file)
  {
  	return single_open(file, ide_driver_proc_show, PDE(inode)->data);

  }

  static int ide_replace_subdriver(ide_drive_t *drive, const char *driver)
  {
  	struct device *dev = &drive->gendev;
  	int ret = 1;

  	int err;

  	device_release_driver(dev);
  	/* FIXME: device can still be in use by previous driver */
  	strlcpy(drive->driver_req, driver, sizeof(drive->driver_req));

  	err = device_attach(dev);
  	if (err < 0)
  		printk(KERN_WARNING "IDE: %s: device_attach error: %d
  ",

  			__func__, err);

  	drive->driver_req[0] = 0;

  	if (dev->driver == NULL) {
  		err = device_attach(dev);
  		if (err < 0)
  			printk(KERN_WARNING
  				"IDE: %s: device_attach(2) error: %d
  ",

  				__func__, err);

  	}

  	if (dev->driver && !strcmp(dev->driver->name, driver))
  		ret = 0;

  
  	return ret;
  }

  static ssize_t ide_driver_proc_write(struct file *file, const char __user *buffer,
  				     size_t count, loff_t *pos)

  {

  	ide_drive_t	*drive = (ide_drive_t *) PDE(file->f_path.dentry->d_inode)->data;

  	char name[32];
  
  	if (!capable(CAP_SYS_ADMIN))
  		return -EACCES;
  	if (count > 31)
  		count = 31;
  	if (copy_from_user(name, buffer, count))
  		return -EFAULT;
  	name[count] = '\0';
  	if (ide_replace_subdriver(drive, name))
  		return -EINVAL;
  	return count;
  }

  static const struct file_operations ide_driver_proc_fops = {
  	.owner		= THIS_MODULE,
  	.open		= ide_driver_proc_open,
  	.read		= seq_read,
  	.llseek		= seq_lseek,
  	.release	= single_release,
  	.write		= ide_driver_proc_write,
  };
  
  static int ide_media_proc_show(struct seq_file *m, void *v)

  {

  	ide_drive_t	*drive = (ide_drive_t *) m->private;

  	const char	*media;

  
  	switch (drive->media) {

  	case ide_disk:		media = "disk
  ";	break;
  	case ide_cdrom:		media = "cdrom
  ";	break;
  	case ide_tape:		media = "tape
  ";	break;
  	case ide_floppy:	media = "floppy
  ";	break;
  	case ide_optical:	media = "optical
  ";	break;
  	default:		media = "UNKNOWN
  ";	break;

  	}

  	seq_puts(m, media);
  	return 0;
  }
  
  static int ide_media_proc_open(struct inode *inode, struct file *file)
  {
  	return single_open(file, ide_media_proc_show, PDE(inode)->data);

  }

  static const struct file_operations ide_media_proc_fops = {
  	.owner		= THIS_MODULE,
  	.open		= ide_media_proc_open,
  	.read		= seq_read,
  	.llseek		= seq_lseek,
  	.release	= single_release,
  };

  static ide_proc_entry_t generic_drive_entries[] = {

  	{ "driver",	S_IFREG|S_IRUGO,	 &ide_driver_proc_fops	},
  	{ "identify",	S_IFREG|S_IRUSR,	 &ide_identify_proc_fops},
  	{ "media",	S_IFREG|S_IRUGO,	 &ide_media_proc_fops	},
  	{ "model",	S_IFREG|S_IRUGO,	 &ide_dmodel_proc_fops	},
  	{ "settings",	S_IFREG|S_IRUSR|S_IWUSR, &ide_settings_proc_fops},
  	{}

  };

  static void ide_add_proc_entries(struct proc_dir_entry *dir, ide_proc_entry_t *p, void *data)

  {
  	struct proc_dir_entry *ent;
  
  	if (!dir || !p)
  		return;
  	while (p->name != NULL) {

  		ent = proc_create_data(p->name, p->mode, dir, p->proc_fops, data);

  		if (!ent) return;

  		p++;
  	}
  }

  static void ide_remove_proc_entries(struct proc_dir_entry *dir, ide_proc_entry_t *p)

  {
  	if (!dir || !p)
  		return;
  	while (p->name != NULL) {
  		remove_proc_entry(p->name, dir);
  		p++;
  	}
  }

  void ide_proc_register_driver(ide_drive_t *drive, struct ide_driver *driver)

  {

  	mutex_lock(&ide_setting_mtx);

  	drive->settings = driver->proc_devsets(drive);

  	mutex_unlock(&ide_setting_mtx);

  	ide_add_proc_entries(drive->proc, driver->proc_entries(drive), drive);

  }
  
  EXPORT_SYMBOL(ide_proc_register_driver);
  
  /**
   *	ide_proc_unregister_driver	-	remove driver specific data
   *	@drive: drive
   *	@driver: driver
   *
   *	Clean up the driver specific /proc files and IDE settings
   *	for a given drive.
   *

   *	Takes ide_setting_mtx.

   */

  void ide_proc_unregister_driver(ide_drive_t *drive, struct ide_driver *driver)

  {

  	ide_remove_proc_entries(drive->proc, driver->proc_entries(drive));

  	mutex_lock(&ide_setting_mtx);

  	/*

  	 * ide_setting_mtx protects both the settings list and the use
  	 * of settings (we cannot take a setting out that is being used).

  	 */

  	drive->settings = NULL;

  	mutex_unlock(&ide_setting_mtx);

  }

  EXPORT_SYMBOL(ide_proc_unregister_driver);

  void ide_proc_port_register_devices(ide_hwif_t *hwif)

  {

  	struct proc_dir_entry *ent;
  	struct proc_dir_entry *parent = hwif->proc;

  	ide_drive_t *drive;

  	char name[64];

  	int i;

  	ide_port_for_each_dev(i, drive, hwif) {

  		if ((drive->dev_flags & IDE_DFLAG_PRESENT) == 0)

  			continue;
  
  		drive->proc = proc_mkdir(drive->name, parent);
  		if (drive->proc)
  			ide_add_proc_entries(drive->proc, generic_drive_entries, drive);

  		sprintf(name, "ide%d/%s", (drive->name[2]-'a')/2, drive->name);

  		ent = proc_symlink(drive->name, proc_ide_root, name);
  		if (!ent) return;
  	}
  }

  void ide_proc_unregister_device(ide_drive_t *drive)

  {
  	if (drive->proc) {
  		ide_remove_proc_entries(drive->proc, generic_drive_entries);
  		remove_proc_entry(drive->name, proc_ide_root);

  		remove_proc_entry(drive->name, drive->hwif->proc);

  		drive->proc = NULL;
  	}
  }

  static ide_proc_entry_t hwif_entries[] = {

  	{ "channel",	S_IFREG|S_IRUGO,	&ide_channel_proc_fops	},
  	{ "mate",	S_IFREG|S_IRUGO,	&ide_mate_proc_fops	},
  	{ "model",	S_IFREG|S_IRUGO,	&ide_imodel_proc_fops	},
  	{}

  };

  void ide_proc_register_port(ide_hwif_t *hwif)

  {

  	if (!hwif->proc) {
  		hwif->proc = proc_mkdir(hwif->name, proc_ide_root);

  		if (!hwif->proc)
  			return;
  
  		ide_add_proc_entries(hwif->proc, hwif_entries, hwif);

  	}
  }

  void ide_proc_unregister_port(ide_hwif_t *hwif)

  {
  	if (hwif->proc) {

  		ide_remove_proc_entries(hwif->proc, hwif_entries);
  		remove_proc_entry(hwif->name, proc_ide_root);
  		hwif->proc = NULL;
  	}
  }

  static int proc_print_driver(struct device_driver *drv, void *data)
  {

  	struct ide_driver *ide_drv = to_ide_driver(drv);

  	struct seq_file *s = data;
  
  	seq_printf(s, "%s version %s
  ", drv->name, ide_drv->version);
  
  	return 0;
  }
  
  static int ide_drivers_show(struct seq_file *s, void *p)
  {

  	int err;
  
  	err = bus_for_each_drv(&ide_bus_type, NULL, s, proc_print_driver);
  	if (err < 0)
  		printk(KERN_WARNING "IDE: %s: bus_for_each_drv error: %d
  ",

  			__func__, err);

  	return 0;
  }

  static int ide_drivers_open(struct inode *inode, struct file *file)
  {

  	return single_open(file, &ide_drivers_show, NULL);

  }

  static const struct file_operations ide_drivers_operations = {

  	.owner		= THIS_MODULE,

  	.open		= ide_drivers_open,
  	.read		= seq_read,
  	.llseek		= seq_lseek,

  	.release	= single_release,

  };
  
  void proc_ide_create(void)
  {

  	proc_ide_root = proc_mkdir("ide", NULL);

  	if (!proc_ide_root)
  		return;

  	proc_create("drivers", 0, proc_ide_root, &ide_drivers_operations);

  }
  
  void proc_ide_destroy(void)
  {

  	remove_proc_entry("drivers", proc_ide_root);

  	remove_proc_entry("ide", NULL);
  }