ide: /proc/ide/hd*/settings rework

* Add struct ide_devset, S_* flags, *DEVSET() & ide*_devset_*() macros.

* Add 'const struct ide_devset **settings' to ide_driver_t.

* Use 'const struct ide_devset **settings' in ide_drive_t instead of
  'struct ide_settings_s *settings'.  Then convert core code and device
  drivers to use struct ide_devset and co.:

  - device settings are no longer allocated dynamically for each device
    but instead there is an unique struct ide_devset instance per setting

  - device driver keeps the pointer to the table of pointers to its
    settings in ide_driver_t.settings

  - generic settings are kept in ide_generic_setting[]

  - ide_proc_[un]register_driver(), ide_find_setting_by_name(),
    ide_{read,write}_setting() and proc_ide_{read,write}_settings()
    are updated accordingly

  - ide*_add_settings() are removed

* Remove no longer used __ide_add_setting(), ide_add_setting(),
  __ide_remove_setting() and auto_remove_settings().

* Remove no longer used TYPE_*, SETTING_*, ide_procset_t
  and ide_settings_t.

* ->keep_settings, ->using_dma, ->unmask, ->noflush, ->dsc_overlap,
  ->nice1, ->addressing, ->wcache and ->nowerr ide_drive_t fields
  can now be bitfield flags.

While at it:

* Rename ide_find_setting_by_name() to ide_find_setting().

* Rename write_wcache() to set_wcache().

There should be no functional changes caused by this patch.

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

8 files changed, 266 insertions, 299 deletions

diff --git a/drivers/ide/ide-cd.c b/drivers/ide/ide-cd.c
index 34a1aeaa15dd..1f5652326489 100644
--- a/drivers/ide/ide-cd.c
+++ b/drivers/ide/ide-cd.c
@@ -1809,13 +1809,12 @@ static ide_proc_entry_t idecd_proc[] = {
         { NULL, 0, NULL, NULL }
 };
 
-static void ide_cdrom_add_settings(ide_drive_t *drive)
-{
-        ide_add_setting(drive, "dsc_overlap", SETTING_RW, TYPE_BYTE, 0, 1, 1, 1,
-                        &drive->dsc_overlap, NULL);
-}
-#else
-static inline void ide_cdrom_add_settings(ide_drive_t *drive) { ; }
+ide_devset_rw(dsc_overlap, 0, 1, dsc_overlap);
+
+static const struct ide_devset *idecd_settings[] = {
+        &ide_devset_dsc_overlap,
+        NULL
+};
 #endif
 
 static const struct cd_list_entry ide_cd_quirks_list[] = {
@@ -1926,7 +1925,6 @@ static int ide_cdrom_setup(ide_drive_t *drive)
         }
 
         ide_proc_register_driver(drive, cd->driver);
-        ide_cdrom_add_settings(drive);
         return 0;
 }
 
@@ -1977,6 +1975,7 @@ static ide_driver_t ide_cdrom_driver = {
         .error                  = __ide_error,
 #ifdef CONFIG_IDE_PROC_FS
         .proc                   = idecd_proc,
+        .settings               = idecd_settings,
 #endif
 };
 
diff --git a/drivers/ide/ide-disk.c b/drivers/ide/ide-disk.c
index 7a15907dce1d..2e43ae15fb1b 100644
--- a/drivers/ide/ide-disk.c
+++ b/drivers/ide/ide-disk.c
@@ -599,6 +599,8 @@ static void idedisk_prepare_flush(struct request_queue *q, struct request *rq)
         rq->special = task;
 }
 
+ide_devset_get(multcount, mult_count);
+
 /*
  * This is tightly woven into the driver->do_special can not touch.
  * DON'T do it again until a total personality rewrite is committed.
@@ -625,6 +627,8 @@ static int set_multcount(ide_drive_t *drive, int arg)
         return (drive->mult_count == arg) ? 0 : -EIO;
 }
 
+ide_devset_get(nowerr, nowerr);
+
 static int set_nowerr(ide_drive_t *drive, int arg)
 {
         if (arg < 0 || arg > 1)
@@ -673,7 +677,9 @@ static void update_ordered(ide_drive_t *drive)
         blk_queue_ordered(drive->queue, ordered, prep_fn);
 }
 
-static int write_cache(ide_drive_t *drive, int arg)
+ide_devset_get(wcache, wcache);
+
+static int set_wcache(ide_drive_t *drive, int arg)
 {
         ide_task_t args;
         int err = 1;
@@ -710,6 +716,8 @@ static int do_idedisk_flushcache(ide_drive_t *drive)
         return ide_no_data_taskfile(drive, &args);
 }
 
+ide_devset_get(acoustic, acoustic);
+
 static int set_acoustic(ide_drive_t *drive, int arg)
 {
         ide_task_t args;
@@ -727,6 +735,8 @@ static int set_acoustic(ide_drive_t *drive, int arg)
         return 0;
 }
 
+ide_devset_get(lba_addressing, addressing);
+
 /*
  * drive->addressing:
  *      0: 28-bit
@@ -750,33 +760,33 @@ static int set_lba_addressing(ide_drive_t *drive, int arg)
 }
 
 #ifdef CONFIG_IDE_PROC_FS
-static void idedisk_add_settings(ide_drive_t *drive)
-{
-        ide_add_setting(drive, "bios_cyl", SETTING_RW, TYPE_INT, 0, 65535, 1, 1,
-                        &drive->bios_cyl, NULL);
-        ide_add_setting(drive, "bios_head", SETTING_RW, TYPE_BYTE, 0, 255, 1, 1,
-                        &drive->bios_head, NULL);
-        ide_add_setting(drive, "bios_sect", SETTING_RW, TYPE_BYTE, 0, 63, 1, 1,
-                        &drive->bios_sect, NULL);
-        ide_add_setting(drive, "address", SETTING_RW, TYPE_BYTE, 0, 2, 1, 1,
-                        &drive->addressing, set_lba_addressing);
-        ide_add_setting(drive, "multcount", SETTING_RW, TYPE_BYTE, 0, 16, 1, 1,
-                        &drive->mult_count, set_multcount);
-        ide_add_setting(drive, "nowerr", SETTING_RW, TYPE_BYTE, 0, 1, 1, 1,
-                        &drive->nowerr, set_nowerr);
-        ide_add_setting(drive, "lun", SETTING_RW, TYPE_INT, 0, 7, 1, 1,
-                        &drive->lun, NULL);
-        ide_add_setting(drive, "wcache", SETTING_RW, TYPE_BYTE, 0, 1, 1, 1,
-                        &drive->wcache, write_cache);
-        ide_add_setting(drive, "acoustic", SETTING_RW, TYPE_BYTE, 0, 254, 1, 1,
-                        &drive->acoustic, set_acoustic);
-        ide_add_setting(drive, "failures", SETTING_RW, TYPE_INT, 0, 65535, 1, 1,
-                        &drive->failures, NULL);
-        ide_add_setting(drive, "max_failures", SETTING_RW, TYPE_INT, 0, 65535,
-                        1, 1, &drive->max_failures, NULL);
-}
-#else
-static inline void idedisk_add_settings(ide_drive_t *drive) { ; }
+ide_devset_rw_nolock(acoustic,  0, 254, acoustic);
+ide_devset_rw_nolock(address,   0,   2, lba_addressing);
+ide_devset_rw_nolock(multcount, 0,  16, multcount);
+ide_devset_rw_nolock(nowerr,    0,   1, nowerr);
+ide_devset_rw_nolock(wcache,    0,   1, wcache);
+
+ide_devset_rw(bios_cyl,         0, 65535, bios_cyl);
+ide_devset_rw(bios_head,        0,   255, bios_head);
+ide_devset_rw(bios_sect,        0,    63, bios_sect);
+ide_devset_rw(failures,         0, 65535, failures);
+ide_devset_rw(lun,              0,     7, lun);
+ide_devset_rw(max_failures,     0, 65535, max_failures);
+
+static const struct ide_devset *idedisk_settings[] = {
+        &ide_devset_acoustic,
+        &ide_devset_address,
+        &ide_devset_bios_cyl,
+        &ide_devset_bios_head,
+        &ide_devset_bios_sect,
+        &ide_devset_failures,
+        &ide_devset_lun,
+        &ide_devset_max_failures,
+        &ide_devset_multcount,
+        &ide_devset_nowerr,
+        &ide_devset_wcache,
+        NULL
+};
 #endif
 
 static void idedisk_setup(ide_drive_t *drive)
@@ -788,7 +798,6 @@ static void idedisk_setup(ide_drive_t *drive)
         unsigned long long capacity;
 
         ide_proc_register_driver(drive, idkp->driver);
-        idedisk_add_settings(drive);
 
         if (drive->id_read == 0)
                 return;
@@ -880,7 +889,7 @@ static void idedisk_setup(ide_drive_t *drive)
         if ((id[ATA_ID_CSFO] & 1) || ata_id_wcache_enabled(id))
                 drive->wcache = 1;
 
-        write_cache(drive, 1);
+        set_wcache(drive, 1);
 }
 
 static void ide_cacheflush_p(ide_drive_t *drive)
@@ -976,6 +985,7 @@ static ide_driver_t idedisk_driver = {
         .error                  = __ide_error,
 #ifdef CONFIG_IDE_PROC_FS
         .proc                   = idedisk_proc,
+        .settings               = idedisk_settings,
 #endif
 };
 
@@ -1056,19 +1066,18 @@ static int idedisk_ioctl(struct inode *inode, struct file *file,
         struct block_device *bdev = inode->i_bdev;
         struct ide_disk_obj *idkp = ide_disk_g(bdev->bd_disk);
         ide_drive_t *drive = idkp->drive;
-        int err, (*setfunc)(ide_drive_t *, int);
-        u8 *val;
+        int err, (*getfunc)(ide_drive_t *), (*setfunc)(ide_drive_t *, int);
 
         switch (cmd) {
-        case HDIO_GET_ADDRESS:   val = &drive->addressing;      goto read_val;
-        case HDIO_GET_MULTCOUNT: val = &drive->mult_count;      goto read_val;
-        case HDIO_GET_NOWERR:    val = &drive->nowerr;          goto read_val;
-        case HDIO_GET_WCACHE:    val = &drive->wcache;          goto read_val;
-        case HDIO_GET_ACOUSTIC:  val = &drive->acoustic;        goto read_val;
+        case HDIO_GET_ADDRESS:   getfunc = get_lba_addressing;  goto read_val;
+        case HDIO_GET_MULTCOUNT: getfunc = get_multcount;       goto read_val;
+        case HDIO_GET_NOWERR:    getfunc = get_nowerr;          goto read_val;
+        case HDIO_GET_WCACHE:    getfunc = get_wcache;          goto read_val;
+        case HDIO_GET_ACOUSTIC:  getfunc = get_acoustic;        goto read_val;
         case HDIO_SET_ADDRESS:   setfunc = set_lba_addressing;  goto set_val;
         case HDIO_SET_MULTCOUNT: setfunc = set_multcount;       goto set_val;
         case HDIO_SET_NOWERR:    setfunc = set_nowerr;          goto set_val;
-        case HDIO_SET_WCACHE:    setfunc = write_cache;         goto set_val;
+        case HDIO_SET_WCACHE:    setfunc = set_wcache;          goto set_val;
         case HDIO_SET_ACOUSTIC:  setfunc = set_acoustic;        goto set_val;
         }
 
@@ -1077,7 +1086,7 @@ static int idedisk_ioctl(struct inode *inode, struct file *file,
 read_val:
         mutex_lock(&ide_setting_mtx);
         spin_lock_irqsave(&ide_lock, flags);
-        err = *val;
+        err = getfunc(drive);
         spin_unlock_irqrestore(&ide_lock, flags);
         mutex_unlock(&ide_setting_mtx);
         return err >= 0 ? put_user(err, (long __user *)arg) : err;
diff --git a/drivers/ide/ide-floppy.c b/drivers/ide/ide-floppy.c
index 597459c81d5f..673644fdb6f2 100644
--- a/drivers/ide/ide-floppy.c
+++ b/drivers/ide/ide-floppy.c
@@ -1007,21 +1007,32 @@ static int idefloppy_identify_device(ide_drive_t *drive, u16 *id)
 }
 
 #ifdef CONFIG_IDE_PROC_FS
-static void idefloppy_add_settings(ide_drive_t *drive)
+ide_devset_rw(bios_cyl,  0, 1023, bios_cyl);
+ide_devset_rw(bios_head, 0,  255, bios_head);
+ide_devset_rw(bios_sect, 0,   63, bios_sect);
+
+static int get_ticks(ide_drive_t *drive)
 {
         idefloppy_floppy_t *floppy = drive->driver_data;
+        return floppy->ticks;
+}
 
-        ide_add_setting(drive, "bios_cyl", SETTING_RW, TYPE_INT, 0, 1023, 1, 1,
-                        &drive->bios_cyl, NULL);
-        ide_add_setting(drive, "bios_head", SETTING_RW, TYPE_BYTE, 0, 255, 1, 1,
-                        &drive->bios_head, NULL);
-        ide_add_setting(drive, "bios_sect", SETTING_RW, TYPE_BYTE, 0,  63, 1, 1,
-                        &drive->bios_sect, NULL);
-        ide_add_setting(drive, "ticks",    SETTING_RW, TYPE_BYTE, 0, 255, 1, 1,
-                        &floppy->ticks,  NULL);
+static int set_ticks(ide_drive_t *drive, int arg)
+{
+        idefloppy_floppy_t *floppy = drive->driver_data;
+        floppy->ticks = arg;
+        return 0;
 }
-#else
-static inline void idefloppy_add_settings(ide_drive_t *drive) { ; }
+
+IDE_DEVSET(ticks, S_RW, 0, 255, get_ticks, set_ticks);
+
+static const struct ide_devset *idefloppy_settings[] = {
+        &ide_devset_bios_cyl,
+        &ide_devset_bios_head,
+        &ide_devset_bios_sect,
+        &ide_devset_ticks,
+        NULL
+};
 #endif
 
 static void idefloppy_setup(ide_drive_t *drive, idefloppy_floppy_t *floppy)
@@ -1063,7 +1074,6 @@ static void idefloppy_setup(ide_drive_t *drive, idefloppy_floppy_t *floppy)
         (void) ide_floppy_get_capacity(drive);
 
         ide_proc_register_driver(drive, floppy->driver);
-        idefloppy_add_settings(drive);
 }
 
 static void ide_floppy_remove(ide_drive_t *drive)
@@ -1126,6 +1136,7 @@ static ide_driver_t idefloppy_driver = {
         .error                  = __ide_error,
 #ifdef CONFIG_IDE_PROC_FS
         .proc                   = idefloppy_proc,
+        .settings               = idefloppy_settings,
 #endif
 };
 
diff --git a/drivers/ide/ide-probe.c b/drivers/ide/ide-probe.c
index 9926e12783bb..62f7e1ef10c1 100644
--- a/drivers/ide/ide-probe.c
+++ b/drivers/ide/ide-probe.c
@@ -1332,8 +1332,6 @@ static void hwif_register_devices(ide_hwif_t *hwif)
                 if (!drive->present)
                         continue;
 
-                ide_add_generic_settings(drive);
-
                 snprintf(dev->bus_id, BUS_ID_SIZE, "%u.%u", hwif->index, i);
                 dev->parent = &hwif->gendev;
                 dev->bus = &ide_bus_type;
diff --git a/drivers/ide/ide-proc.c b/drivers/ide/ide-proc.c
index 7a64aedfa648..5634b3971d21 100644
--- a/drivers/ide/ide-proc.c
+++ b/drivers/ide/ide-proc.c
@@ -114,140 +114,24 @@ static int proc_ide_read_identify
 }
 
 /**
- *      __ide_add_setting       -       add an ide setting option
- *      @drive: drive to use
+ *      ide_find_setting        -       find a specific setting
+ *      @st: setting table pointer
  *      @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;
-
-        mutex_lock(&ide_setting_mtx);
-        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;
-        mutex_unlock(&ide_setting_mtx);
-        return 0;
-abort:
-        mutex_unlock(&ide_setting_mtx);
-        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);
-        setting = (*p);
-        if (setting == NULL)
-                return;
-
-        (*p) = setting->next;
-
-        kfree(setting->name);
-        kfree(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_mtx.
- */
-
-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_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
+ *      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 ide_settings_t *ide_find_setting_by_name(ide_drive_t *drive, char *name)
+static const struct ide_devset *ide_find_setting(const struct ide_devset **st,
+                                                 char *name)
 {
-        ide_settings_t *setting = drive->settings;
-
-        while (setting) {
-                if (strcmp(setting->name, name) == 0)
+        while (*st) {
+                if (strcmp((*st)->name, name) == 0)
                         break;
-                setting = setting->next;
+                st++;
         }
-        return setting;
+        return *st;
 }
 
 /**
@@ -263,26 +147,19 @@ static ide_settings_t *ide_find_setting_by_name(ide_drive_t *drive, char *name)
  *      be told apart
  */
 
-static int ide_read_setting(ide_drive_t *drive, ide_settings_t *setting)
+static int ide_read_setting(ide_drive_t *drive,
+                            const struct ide_devset *setting)
 {
-        int             val = -EINVAL;
-        unsigned long   flags;
+        int val = -EINVAL;
+
+        if ((setting->flags & S_READ)) {
+                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;
-                }
+                val = setting->get(drive);
                 spin_unlock_irqrestore(&ide_lock, flags);
         }
+
         return val;
 }
 
@@ -304,33 +181,26 @@ static int ide_read_setting(ide_drive_t *drive, ide_settings_t *setting)
  *      The current scheme of polling is kludgy, though safe enough.
  */
 
-static int ide_write_setting(ide_drive_t *drive, ide_settings_t *setting, int val)
+static int ide_write_setting(ide_drive_t *drive,
+                             const struct ide_devset *setting, int val)
 {
         if (!capable(CAP_SYS_ADMIN))
                 return -EACCES;
-        if (setting->set)
+        if (setting->set && (setting->flags & S_NOLOCK))
                 return setting->set(drive, val);
-        if (!(setting->rw & SETTING_WRITE))
+        if (!(setting->flags & S_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;
-        }
+        setting->set(drive, val);
         spin_unlock_irq(&ide_lock);
         return 0;
 }
 
+static ide_devset_get(xfer_rate, current_speed);
+
 static int set_xfer_rate (ide_drive_t *drive, int arg)
 {
         ide_task_t task;
@@ -355,29 +225,30 @@ static int set_xfer_rate (ide_drive_t *drive, int arg)
         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_mtx.
- */
-
-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",             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,          set_ksettings,  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",            SETTING_RW,                                     TYPE_BYTE,      0,      1,                              1,              1,              &drive->unmask,                 set_unmaskirq,  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);
-}
+ide_devset_rw_nolock(current_speed, 0, 70, xfer_rate);
+ide_devset_rw_nolock(io_32bit, 0, 1 + (SUPPORT_VLB_SYNC << 1), io_32bit);
+ide_devset_rw_nolock(keepsettings, 0, 1, ksettings);
+ide_devset_rw_nolock(unmaskirq, 0, 1, unmaskirq);
+ide_devset_rw_nolock(using_dma, 0, 1, using_dma);
+
+ide_devset_w_nolock(pio_mode, 0, 255, pio_mode);
+
+ide_devset_rw(init_speed, 0, 70, init_speed);
+ide_devset_rw(nice1, 0, 1, nice1);
+ide_devset_rw(number, 0, 3, dn);
+
+static const struct ide_devset *ide_generic_settings[] = {
+        &ide_devset_current_speed,
+        &ide_devset_init_speed,
+        &ide_devset_io_32bit,
+        &ide_devset_keepsettings,
+        &ide_devset_nice1,
+        &ide_devset_number,
+        &ide_devset_pio_mode,
+        &ide_devset_unmaskirq,
+        &ide_devset_using_dma,
+        NULL
+};
 
 static void proc_ide_settings_warn(void)
 {
@@ -394,19 +265,31 @@ static void proc_ide_settings_warn(void)
 static int proc_ide_read_settings
         (char *page, char **start, off_t off, int count, int *eof, void *data)
 {
+        const struct ide_devset *setting, **g, **d;
         ide_drive_t     *drive = (ide_drive_t *) data;
-        ide_settings_t  *setting = (ide_settings_t *) drive->settings;
         char            *out = page;
         int             len, rc, mul_factor, div_factor;
 
         proc_ide_settings_warn();
 
         mutex_lock(&ide_setting_mtx);
+        g = ide_generic_settings;
+        d = drive->settings;
         out += sprintf(out, "name\t\t\tvalue\t\tmin\t\tmax\t\tmode\n");
         out += sprintf(out, "----\t\t\t-----\t\t---\t\t---\t\t----\n");
-        while (setting) {
-                mul_factor = setting->mul_factor;
-                div_factor = setting->div_factor;
+        while (*g || (d && *d)) {
+                /* read settings in the alphabetical order */
+                if (*g && d && *d) {
+                        if (strcmp((*d)->name, (*g)->name) < 0)
+                                setting = *d++;
+                        else
+                                setting = *g++;
+                } else if (d && *d) {
+                        setting = *d++;
+                } else
+                        setting = *g++;
+                mul_factor = setting->mulf ? setting->mulf(drive) : 1;
+                div_factor = setting->divf ? setting->divf(drive) : 1;
                 out += sprintf(out, "%-24s", setting->name);
                 rc = ide_read_setting(drive, setting);
                 if (rc >= 0)
@@ -414,12 +297,11 @@ static int proc_ide_read_settings
                 else
                         out += sprintf(out, "%-16s", "write-only");
                 out += sprintf(out, "%-16d%-16d", (setting->min * mul_factor + div_factor - 1) / div_factor, setting->max * mul_factor / div_factor);
-                if (setting->rw & SETTING_READ)
+                if (setting->flags & S_READ)
                         out += sprintf(out, "r");
-                if (setting->rw & SETTING_WRITE)
+                if (setting->flags & S_WRITE)
                         out += sprintf(out, "w");
                 out += sprintf(out, "\n");
-                setting = setting->next;
         }
         len = out - page;
         mutex_unlock(&ide_setting_mtx);
@@ -433,9 +315,10 @@ static int proc_ide_write_settings(struct file *file, const char __user *buffer,
 {
         ide_drive_t     *drive = (ide_drive_t *) data;
         char            name[MAX_LEN + 1];
-        int             for_real = 0;
+        int             for_real = 0, mul_factor, div_factor;
         unsigned long   n;
-        ide_settings_t  *setting;
+
+        const struct ide_devset *setting;
         char *buf, *s;
 
         if (!capable(CAP_SYS_ADMIN))
@@ -503,13 +386,21 @@ static int proc_ide_write_settings(struct file *file, const char __user *buffer,
                         }
 
                         mutex_lock(&ide_setting_mtx);
-                        setting = ide_find_setting_by_name(drive, name);
+                        /* generic settings first, then driver specific ones */
+                        setting = ide_find_setting(ide_generic_settings, name);
                         if (!setting) {
-                                mutex_unlock(&ide_setting_mtx);
-                                goto parse_error;
+                                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);
                         }
-                        if (for_real)
-                                ide_write_setting(drive, setting, val * setting->div_factor / setting->mul_factor);
                         mutex_unlock(&ide_setting_mtx);
                 }
         } while (!for_real++);
@@ -680,6 +571,10 @@ static void ide_remove_proc_entries(struct proc_dir_entry *dir, ide_proc_entry_t
 
 void ide_proc_register_driver(ide_drive_t *drive, ide_driver_t *driver)
 {
+        mutex_lock(&ide_setting_mtx);
+        drive->settings = driver->settings;
+        mutex_unlock(&ide_setting_mtx);
+
         ide_add_proc_entries(drive->proc, driver->proc, drive);
 }
 
@@ -716,7 +611,7 @@ void ide_proc_unregister_driver(ide_drive_t *drive, ide_driver_t *driver)
          * OTOH both ide_{read,write}_setting are only ever used under
          * ide_setting_mtx.
          */
-        auto_remove_settings(drive);
+        drive->settings = NULL;
         spin_unlock_irqrestore(&ide_lock, flags);
         mutex_unlock(&ide_setting_mtx);
 }
diff --git a/drivers/ide/ide-tape.c b/drivers/ide/ide-tape.c
index f41983e4a4e4..7037accb0589 100644
--- a/drivers/ide/ide-tape.c
+++ b/drivers/ide/ide-tape.c
@@ -2410,28 +2410,56 @@ static void idetape_get_mode_sense_results(ide_drive_t *drive)
 }
 
 #ifdef CONFIG_IDE_PROC_FS
-static void idetape_add_settings(ide_drive_t *drive)
-{
-        idetape_tape_t *tape = drive->driver_data;
-
-        ide_add_setting(drive, "buffer", SETTING_READ, TYPE_SHORT, 0, 0xffff,
-                        1, 2, (u16 *)&tape->caps[16], NULL);
-        ide_add_setting(drive, "speed", SETTING_READ, TYPE_SHORT, 0, 0xffff,
-                        1, 1, (u16 *)&tape->caps[14], NULL);
-        ide_add_setting(drive, "buffer_size", SETTING_READ, TYPE_INT, 0, 0xffff,
-                        1, 1024, &tape->buffer_size, NULL);
-        ide_add_setting(drive, "tdsc", SETTING_RW, TYPE_INT, IDETAPE_DSC_RW_MIN,
-                        IDETAPE_DSC_RW_MAX, 1000, HZ, &tape->best_dsc_rw_freq,
-                        NULL);
-        ide_add_setting(drive, "dsc_overlap", SETTING_RW, TYPE_BYTE, 0, 1, 1,
-                        1, &drive->dsc_overlap, NULL);
-        ide_add_setting(drive, "avg_speed", SETTING_READ, TYPE_INT, 0, 0xffff,
-                        1, 1, &tape->avg_speed, NULL);
-        ide_add_setting(drive, "debug_mask", SETTING_RW, TYPE_INT, 0, 0xffff, 1,
-                        1, &tape->debug_mask, NULL);
-}
-#else
-static inline void idetape_add_settings(ide_drive_t *drive) { ; }
+#define ide_tape_devset_get(name, field) \
+static int get_##name(ide_drive_t *drive) \
+{ \
+        idetape_tape_t *tape = drive->driver_data; \
+        return tape->field; \
+}
+
+#define ide_tape_devset_set(name, field) \
+static int set_##name(ide_drive_t *drive, int arg) \
+{ \
+        idetape_tape_t *tape = drive->driver_data; \
+        tape->field = arg; \
+        return 0; \
+}
+
+#define ide_tape_devset_rw(_name, _min, _max, _field, _mulf, _divf) \
+ide_tape_devset_get(_name, _field) \
+ide_tape_devset_set(_name, _field) \
+__IDE_DEVSET(_name, S_RW, _min, _max, get_##_name, set_##_name, _mulf, _divf)
+
+#define ide_tape_devset_r(_name, _min, _max, _field, _mulf, _divf) \
+ide_tape_devset_get(_name, _field) \
+__IDE_DEVSET(_name, S_READ, _min, _max, get_##_name, NULL, _mulf, _divf)
+
+static int mulf_tdsc(ide_drive_t *drive)        { return 1000; }
+static int divf_tdsc(ide_drive_t *drive)        { return   HZ; }
+static int divf_buffer(ide_drive_t *drive)      { return    2; }
+static int divf_buffer_size(ide_drive_t *drive) { return 1024; }
+
+ide_devset_rw(dsc_overlap,      0,      1, dsc_overlap);
+
+ide_tape_devset_rw(debug_mask,  0, 0xffff, debug_mask,  NULL, NULL);
+ide_tape_devset_rw(tdsc, IDETAPE_DSC_RW_MIN, IDETAPE_DSC_RW_MAX,
+                   best_dsc_rw_freq, mulf_tdsc, divf_tdsc);
+
+ide_tape_devset_r(avg_speed,    0, 0xffff, avg_speed,   NULL, NULL);
+ide_tape_devset_r(speed,        0, 0xffff, caps[14],    NULL, NULL);
+ide_tape_devset_r(buffer,       0, 0xffff, caps[16],    NULL, divf_buffer);
+ide_tape_devset_r(buffer_size,  0, 0xffff, buffer_size, NULL, divf_buffer_size);
+
+static const struct ide_devset *idetape_settings[] = {
+        &ide_devset_avg_speed,
+        &ide_devset_buffer,
+        &ide_devset_buffer_size,
+        &ide_devset_debug_mask,
+        &ide_devset_dsc_overlap,
+        &ide_devset_speed,
+        &ide_devset_tdsc,
+        NULL
+};
 #endif
 
 /*
@@ -2515,7 +2543,6 @@ static void idetape_setup(ide_drive_t *drive, idetape_tape_t *tape, int minor)
                 drive->using_dma ? ", DMA":"");
 
         ide_proc_register_driver(drive, tape->driver);
-        idetape_add_settings(drive);
 }
 
 static void ide_tape_remove(ide_drive_t *drive)
@@ -2586,6 +2613,7 @@ static ide_driver_t idetape_driver = {
         .error                  = __ide_error,
 #ifdef CONFIG_IDE_PROC_FS
         .proc                   = idetape_proc,
+        .settings               = idetape_settings,
 #endif
 };
 
diff --git a/drivers/ide/ide.c b/drivers/ide/ide.c
index 8e0c9f27ae4a..eb64e942f58b 100644
--- a/drivers/ide/ide.c
+++ b/drivers/ide/ide.c
@@ -287,6 +287,8 @@ int ide_spin_wait_hwgroup (ide_drive_t *drive)
 
 EXPORT_SYMBOL(ide_spin_wait_hwgroup);
 
+ide_devset_get(io_32bit, io_32bit);
+
 int set_io_32bit(ide_drive_t *drive, int arg)
 {
         if (drive->no_io_32bit)
@@ -305,6 +307,8 @@ int set_io_32bit(ide_drive_t *drive, int arg)
         return 0;
 }
 
+ide_devset_get(ksettings, keep_settings);
+
 int set_ksettings(ide_drive_t *drive, int arg)
 {
         if (arg < 0 || arg > 1)
@@ -318,6 +322,8 @@ int set_ksettings(ide_drive_t *drive, int arg)
         return 0;
 }
 
+ide_devset_get(using_dma, using_dma);
+
 int set_using_dma(ide_drive_t *drive, int arg)
 {
 #ifdef CONFIG_BLK_DEV_IDEDMA
@@ -394,6 +400,8 @@ int set_pio_mode(ide_drive_t *drive, int arg)
         return 0;
 }
 
+ide_devset_get(unmaskirq, unmask);
+
 int set_unmaskirq(ide_drive_t *drive, int arg)
 {
         if (drive->no_unmask)
@@ -555,14 +563,13 @@ int generic_ide_ioctl(ide_drive_t *drive, struct file *file, struct block_device
 {
         unsigned long flags;
         ide_driver_t *drv;
-        int err = 0, (*setfunc)(ide_drive_t *, int);
-        u8 *val;
+        int err = 0, (*getfunc)(ide_drive_t *), (*setfunc)(ide_drive_t *, int);
 
         switch (cmd) {
-        case HDIO_GET_32BIT:        val = &drive->io_32bit;      goto read_val;
-        case HDIO_GET_KEEPSETTINGS: val = &drive->keep_settings; goto read_val;
-        case HDIO_GET_UNMASKINTR:   val = &drive->unmask;        goto read_val;
-        case HDIO_GET_DMA:          val = &drive->using_dma;     goto read_val;
+        case HDIO_GET_32BIT:        getfunc = get_io_32bit;      goto read_val;
+        case HDIO_GET_KEEPSETTINGS: getfunc = get_ksettings;     goto read_val;
+        case HDIO_GET_UNMASKINTR:   getfunc = get_unmaskirq;     goto read_val;
+        case HDIO_GET_DMA:          getfunc = get_using_dma;     goto read_val;
         case HDIO_SET_32BIT:        setfunc = set_io_32bit;      goto set_val;
         case HDIO_SET_KEEPSETTINGS: setfunc = set_ksettings;     goto set_val;
         case HDIO_SET_PIO_MODE:     setfunc = set_pio_mode;      goto set_val;
@@ -638,7 +645,7 @@ int generic_ide_ioctl(ide_drive_t *drive, struct file *file, struct block_device
 read_val:
         mutex_lock(&ide_setting_mtx);
         spin_lock_irqsave(&ide_lock, flags);
-        err = *val;
+        err = getfunc(drive);
         spin_unlock_irqrestore(&ide_lock, flags);
         mutex_unlock(&ide_setting_mtx);
         return err >= 0 ? put_user(err, (long __user *)arg) : err;
diff --git a/drivers/scsi/ide-scsi.c b/drivers/scsi/ide-scsi.c
index 02bd5c487d1f..65cf84b222c5 100644
--- a/drivers/scsi/ide-scsi.c
+++ b/drivers/scsi/ide-scsi.c
@@ -429,21 +429,41 @@ static ide_startstop_t idescsi_do_request (ide_drive_t *drive, struct request *r
 }
 
 #ifdef CONFIG_IDE_PROC_FS
-static void idescsi_add_settings(ide_drive_t *drive)
-{
-        idescsi_scsi_t *scsi = drive_to_idescsi(drive);
-
-/*
- *                      drive   setting name    read/write      data type       min     max     mul_factor      div_factor      data pointer            set function
- */
-        ide_add_setting(drive,  "bios_cyl",     SETTING_RW,     TYPE_INT,       0,      1023,   1,              1,              &drive->bios_cyl,       NULL);
-        ide_add_setting(drive,  "bios_head",    SETTING_RW,     TYPE_BYTE,      0,      255,    1,              1,              &drive->bios_head,      NULL);
-        ide_add_setting(drive,  "bios_sect",    SETTING_RW,     TYPE_BYTE,      0,      63,     1,              1,              &drive->bios_sect,      NULL);
-        ide_add_setting(drive,  "transform",    SETTING_RW,     TYPE_INT,       0,      3,      1,              1,              &scsi->transform,       NULL);
-        ide_add_setting(drive,  "log",          SETTING_RW,     TYPE_INT,       0,      1,      1,              1,              &scsi->log,             NULL);
-}
-#else
-static inline void idescsi_add_settings(ide_drive_t *drive) { ; }
+#define ide_scsi_devset_get(name, field) \
+static int get_##name(ide_drive_t *drive) \
+{ \
+        idescsi_scsi_t *scsi = drive_to_idescsi(drive); \
+        return scsi->field; \
+}
+
+#define ide_scsi_devset_set(name, field) \
+static int set_##name(ide_drive_t *drive, int arg) \
+{ \
+        idescsi_scsi_t *scsi = drive_to_idescsi(drive); \
+        scsi->field = arg; \
+        return 0; \
+}
+
+#define ide_scsi_devset_rw(_name, _min, _max, _field) \
+ide_scsi_devset_get(_name, _field); \
+ide_scsi_devset_set(_name, _field); \
+IDE_DEVSET(_name, S_RW, _min, _max, get_##_name, set_##_name)
+
+ide_devset_rw(bios_cyl,         0, 1023, bios_cyl);
+ide_devset_rw(bios_head,        0,  255, bios_head);
+ide_devset_rw(bios_sect,        0,   63, bios_sect);
+
+ide_scsi_devset_rw(transform,   0,    3, transform);
+ide_scsi_devset_rw(log,         0,    1, log);
+
+static const struct ide_devset *idescsi_settings[] = {
+        &ide_devset_bios_cyl,
+        &ide_devset_bios_head,
+        &ide_devset_bios_sect,
+        &ide_devset_log,
+        &ide_devset_transform,
+        NULL
+};
 #endif
 
 /*
@@ -461,7 +481,6 @@ static void idescsi_setup (ide_drive_t *drive, idescsi_scsi_t *scsi)
         drive->pc_callback = ide_scsi_callback;
 
         ide_proc_register_driver(drive, scsi->driver);
-        idescsi_add_settings(drive);
 }
 
 static void ide_scsi_remove(ide_drive_t *drive)
@@ -509,6 +528,7 @@ static ide_driver_t idescsi_driver = {
         .error                  = idescsi_atapi_error,
 #ifdef CONFIG_IDE_PROC_FS
         .proc                   = idescsi_proc,
+        .settings               = idescsi_settings,
 #endif
 };