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 8793a960210c..614c5fd43cd2 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
  */