ide: move IDE settings handling to ide-proc.c

* move
	__ide_add_setting()
	ide_add_setting()
	__ide_remove_setting()
	auto_remove_settings()
	ide_find_setting_by_name()
	ide_read_setting()
	ide_write_setting()
	set_xfer_rate()
	ide_add_generic_settings()
	ide_register_subdriver()
	ide_unregister_subdriver()

  from ide.c to ide-proc.c

* set_{io_32bit,pio_mode,using_dma}() cannot be marked static now, fix it

* rename ide_[un]register_subdriver() to ide_proc_[un]register_driver(),
  update device drivers to use new names

* add CONFIG_IDE_PROC_FS=n versions of ide_proc_[un]register_driver()
  and ide_add_generic_settings()

* make ide_find_setting_by_name(), ide_{read,write}_setting()
  and ide_{add,remove}_proc_entries() static

* cover IDE settings code in device drivers with CONFIG_IDE_PROC_FS #ifdef,
  also while at it cover with CONFIG_IDE_PROC_FS #ifdef ide_driver_t.proc

* remove bogus comment from ide.h

* cover with CONFIG_IDE_PROC_FS #ifdef .proc and .settings in ide_drive_t

Besides saner code this patch results in the IDE core smaller by ~2 kB
(on x86-32) and IDE disk driver by ~1 kB (ditto) when CONFIG_IDE_PROC_FS=n.

Signed-off-by: Bartlomiej Zolnierkiewicz <bzolnier@gmail.com>

1 files changed, 3 insertions, 310 deletions

diff --git a/drivers/ide/ide.c b/drivers/ide/ide.c
index 8793a960210..614c5fd43cd 100644
--- a/drivers/ide/ide.c
+++ b/drivers/ide/ide.c
@@ -826,178 +826,6 @@ DECLARE_MUTEX(ide_setting_sem);
 EXPORT_SYMBOL_GPL(ide_setting_sem);
 
 /**
- *	__ide_add_setting	-	add an ide setting option
- *	@drive: drive to use
- *	@name: setting name
- *	@rw: true if the function is read write
- *	@data_type: type of data
- *	@min: range minimum
- *	@max: range maximum
- *	@mul_factor: multiplication scale
- *	@div_factor: divison scale
- *	@data: private data field
- *	@set: setting
- *	@auto_remove: setting auto removal flag
- *
- *	Removes the setting named from the device if it is present.
- *	The function takes the settings_lock to protect against 
- *	parallel changes. This function must not be called from IRQ
- *	context. Returns 0 on success or -1 on failure.
- *
- *	BUGS: This code is seriously over-engineered. There is also
- *	magic about how the driver specific features are setup. If
- *	a driver is attached we assume the driver settings are auto
- *	remove.
- */
-
-static int __ide_add_setting(ide_drive_t *drive, const char *name, int rw, int data_type, int min, int max, int mul_factor, int div_factor, void *data, ide_procset_t *set, int auto_remove)
-{
-	ide_settings_t **p = (ide_settings_t **) &drive->settings, *setting = NULL;
-
-	down(&ide_setting_sem);
-	while ((*p) && strcmp((*p)->name, name) < 0)
-		p = &((*p)->next);
-	if ((setting = kzalloc(sizeof(*setting), GFP_KERNEL)) == NULL)
-		goto abort;
-	if ((setting->name = kmalloc(strlen(name) + 1, GFP_KERNEL)) == NULL)
-		goto abort;
-	strcpy(setting->name, name);
-	setting->rw = rw;
-	setting->data_type = data_type;
-	setting->min = min;
-	setting->max = max;
-	setting->mul_factor = mul_factor;
-	setting->div_factor = div_factor;
-	setting->data = data;
-	setting->set = set;
-	
-	setting->next = *p;
-	if (auto_remove)
-		setting->auto_remove = 1;
-	*p = setting;
-	up(&ide_setting_sem);
-	return 0;
-abort:
-	up(&ide_setting_sem);
-	kfree(setting);
-	return -1;
-}
-
-int ide_add_setting(ide_drive_t *drive, const char *name, int rw, int data_type, int min, int max, int mul_factor, int div_factor, void *data, ide_procset_t *set)
-{
-	return __ide_add_setting(drive, name, rw, data_type, min, max, mul_factor, div_factor, data, set, 1);
-}
-
-EXPORT_SYMBOL(ide_add_setting);
-
-/**
- *	__ide_remove_setting	-	remove an ide setting option
- *	@drive: drive to use
- *	@name: setting name
- *
- *	Removes the setting named from the device if it is present.
- *	The caller must hold the setting semaphore.
- */
- 
-static void __ide_remove_setting (ide_drive_t *drive, char *name)
-{
-	ide_settings_t **p, *setting;
-
-	p = (ide_settings_t **) &drive->settings;
-
-	while ((*p) && strcmp((*p)->name, name))
-		p = &((*p)->next);
-	if ((setting = (*p)) == NULL)
-		return;
-
-	(*p) = setting->next;
-	
-	kfree(setting->name);
-	kfree(setting);
-}
-
-/**
- *	ide_find_setting_by_name	-	find a drive specific setting
- *	@drive: drive to scan
- *	@name: setting name
- *
- *	Scan's the device setting table for a matching entry and returns
- *	this or NULL if no entry is found. The caller must hold the
- *	setting semaphore
- */
- 
-ide_settings_t *ide_find_setting_by_name (ide_drive_t *drive, char *name)
-{
-	ide_settings_t *setting = drive->settings;
-
-	while (setting) {
-		if (strcmp(setting->name, name) == 0)
-			break;
-		setting = setting->next;
-	}
-	return setting;
-}
-
-/**
- *	auto_remove_settings	-	remove driver specific settings
- *	@drive: drive
- *
- *	Automatically remove all the driver specific settings for this
- *	drive. This function may not be called from IRQ context. The
- *	caller must hold ide_setting_sem.
- */
- 
-static void auto_remove_settings (ide_drive_t *drive)
-{
-	ide_settings_t *setting;
-repeat:
-	setting = drive->settings;
-	while (setting) {
-		if (setting->auto_remove) {
-			__ide_remove_setting(drive, setting->name);
-			goto repeat;
-		}
-		setting = setting->next;
-	}
-}
-
-/**
- *	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_sem 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
- */
- 
-int ide_read_setting (ide_drive_t *drive, ide_settings_t *setting)
-{
-	int		val = -EINVAL;
-	unsigned long	flags;
-
-	if ((setting->rw & SETTING_READ)) {
-		spin_lock_irqsave(&ide_lock, flags);
-		switch(setting->data_type) {
-			case TYPE_BYTE:
-				val = *((u8 *) setting->data);
-				break;
-			case TYPE_SHORT:
-				val = *((u16 *) setting->data);
-				break;
-			case TYPE_INT:
-				val = *((u32 *) setting->data);
-				break;
-		}
-		spin_unlock_irqrestore(&ide_lock, flags);
-	}
-	return val;
-}
-
-/**
  *	ide_spin_wait_hwgroup	-	wait for group
  *	@drive: drive in the group
  *
@@ -1030,52 +858,7 @@ int ide_spin_wait_hwgroup (ide_drive_t *drive)
 
 EXPORT_SYMBOL(ide_spin_wait_hwgroup);
 
-/**
- *	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_sem 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.
- */
-
-int ide_write_setting (ide_drive_t *drive, ide_settings_t *setting, int val)
-{
-	if (!capable(CAP_SYS_ADMIN))
-		return -EACCES;
-	if (setting->set)
-		return setting->set(drive, val);
-	if (!(setting->rw & SETTING_WRITE))
-		return -EPERM;
-	if (val < setting->min || val > setting->max)
-		return -EINVAL;
-	if (ide_spin_wait_hwgroup(drive))
-		return -EBUSY;
-	switch (setting->data_type) {
-		case TYPE_BYTE:
-			*((u8 *) setting->data) = val;
-			break;
-		case TYPE_SHORT:
-			*((u16 *) setting->data) = val;
-			break;
-		case TYPE_INT:
-			*((u32 *) setting->data) = val;
-			break;
-	}
-	spin_unlock_irq(&ide_lock);
-	return 0;
-}
-
-static int set_io_32bit(ide_drive_t *drive, int arg)
+int set_io_32bit(ide_drive_t *drive, int arg)
 {
 	if (drive->no_io_32bit)
 		return -EPERM;
@@ -1104,7 +887,7 @@ static int set_ksettings(ide_drive_t *drive, int arg)
 	return 0;
 }
 
-static int set_using_dma (ide_drive_t *drive, int arg)
+int set_using_dma(ide_drive_t *drive, int arg)
 {
 #ifdef CONFIG_BLK_DEV_IDEDMA
 	ide_hwif_t *hwif = drive->hwif;
@@ -1152,7 +935,7 @@ out:
 #endif
 }
 
-static int set_pio_mode (ide_drive_t *drive, int arg)
+int set_pio_mode(ide_drive_t *drive, int arg)
 {
 	struct request rq;
 
@@ -1186,48 +969,6 @@ static int set_unmaskirq(ide_drive_t *drive, int arg)
 	return 0;
 }
 
-static int set_xfer_rate (ide_drive_t *drive, int arg)
-{
-	int err;
-
-	if (arg < 0 || arg > 70)
-		return -EINVAL;
-
-	err = ide_wait_cmd(drive,
-			WIN_SETFEATURES, (u8) arg,
-			SETFEATURES_XFER, 0, NULL);
-
-	if (!err && arg) {
-		ide_set_xfer_rate(drive, (u8) arg);
-		ide_driveid_update(drive);
-	}
-	return err;
-}
-
-/**
- *	ide_add_generic_settings	-	generic ide settings
- *	@drive: drive being configured
- *
- *	Add the generic parts of the system settings to the /proc files.
- *	The caller must not be holding the ide_setting_sem.
- */
-
-void ide_add_generic_settings (ide_drive_t *drive)
-{
-/*
- *			  drive		setting name		read/write access				data type	min	max				mul_factor	div_factor	data pointer			set function
- */
-	__ide_add_setting(drive,	"io_32bit",		drive->no_io_32bit ? SETTING_READ : SETTING_RW,	TYPE_BYTE,	0,	1 + (SUPPORT_VLB_SYNC << 1),	1,		1,		&drive->io_32bit,		set_io_32bit,	0);
-	__ide_add_setting(drive,	"keepsettings",		SETTING_RW,					TYPE_BYTE,	0,	1,				1,		1,		&drive->keep_settings,		NULL,		0);
-	__ide_add_setting(drive,	"nice1",		SETTING_RW,					TYPE_BYTE,	0,	1,				1,		1,		&drive->nice1,			NULL,		0);
-	__ide_add_setting(drive,	"pio_mode",		SETTING_WRITE,					TYPE_BYTE,	0,	255,				1,		1,		NULL,				set_pio_mode,	0);
-	__ide_add_setting(drive,	"unmaskirq",		drive->no_unmask ? SETTING_READ : SETTING_RW,	TYPE_BYTE,	0,	1,				1,		1,		&drive->unmask,			NULL,		0);
-	__ide_add_setting(drive,	"using_dma",		SETTING_RW,					TYPE_BYTE,	0,	1,				1,		1,		&drive->using_dma,		set_using_dma,	0);
-	__ide_add_setting(drive,	"init_speed",		SETTING_RW,					TYPE_BYTE,	0,	70,				1,		1,		&drive->init_speed,		NULL,		0);
-	__ide_add_setting(drive,	"current_speed",	SETTING_RW,					TYPE_BYTE,	0,	70,				1,		1,		&drive->current_speed,		set_xfer_rate,	0);
-	__ide_add_setting(drive,	"number",		SETTING_RW,					TYPE_BYTE,	0,	3,				1,		1,		&drive->dn,			NULL,		0);
-}
-
 /**
  *	system_bus_clock	-	clock guess
  *
@@ -1922,54 +1663,6 @@ static void __init probe_for_hwifs (void)
 #endif
 }
 
-void ide_register_subdriver(ide_drive_t *drive, ide_driver_t *driver)
-{
-#ifdef CONFIG_IDE_PROC_FS
-	ide_add_proc_entries(drive->proc, driver->proc, drive);
-#endif
-}
-
-EXPORT_SYMBOL(ide_register_subdriver);
-
-/**
- *	ide_unregister_subdriver	-	disconnect drive from driver
- *	@drive: drive to unplug
- *	@driver: driver
- *
- *	Disconnect a drive from the driver it was attached to and then
- *	clean up the various proc files and other objects attached to it.
- *
- *	Takes ide_setting_sem and ide_lock.
- *	Caller must hold none of the locks.
- */
-
-void ide_unregister_subdriver(ide_drive_t *drive, ide_driver_t *driver)
-{
-	unsigned long flags;
-
-#ifdef CONFIG_IDE_PROC_FS
-	ide_remove_proc_entries(drive->proc, driver->proc);
-#endif
-	down(&ide_setting_sem);
-	spin_lock_irqsave(&ide_lock, flags);
-	/*
-	 * ide_setting_sem protects the settings list
-	 * ide_lock protects the use of settings
-	 *
-	 * so we need to hold both, ide_settings_sem because we want to
-	 * modify the settings list, and ide_lock because we cannot take
-	 * a setting out that is being used.
-	 *
-	 * OTOH both ide_{read,write}_setting are only ever used under
-	 * ide_setting_sem.
-	 */
-	auto_remove_settings(drive);
-	spin_unlock_irqrestore(&ide_lock, flags);
-	up(&ide_setting_sem);
-}
-
-EXPORT_SYMBOL(ide_unregister_subdriver);
-
 /*
  * Probe module
  */