2 * Copyright (C) 1994-1998 Linus Torvalds & authors (see below)
3 * Copyright (C) 2003-2005, 2007 Bartlomiej Zolnierkiewicz
7 * Mostly written by Mark Lord <mlord@pobox.com>
8 * and Gadi Oxman <gadio@netvision.net.il>
9 * and Andre Hedrick <andre@linux-ide.org>
11 * See linux/MAINTAINERS for address of current maintainer.
13 * This is the multiple IDE interface driver, as evolved from hd.c.
14 * It supports up to MAX_HWIFS IDE interfaces, on one or more IRQs
16 * There can be up to two drives per interface, as per the ATA-2 spec.
22 * | It traverses the request-list, using interrupts to jump between functions.
23 * | As nearly all functions can be called within interrupts, we may not sleep.
24 * | Special care is recommended. Have Fun!
26 * | modified by Drew Eckhardt to check nr of hd's from the CMOS.
28 * | Thanks to Branko Lankester, lankeste@fwi.uva.nl, who found a bug
29 * | in the early extended-partition checks and added DM partitions.
31 * | Early work on error handling by Mika Liljeberg (liljeber@cs.Helsinki.FI).
33 * | IRQ-unmask, drive-id, multiple-mode, support for ">16 heads",
34 * | and general streamlining by Mark Lord (mlord@pobox.com).
36 * October, 1994 -- Complete line-by-line overhaul for linux 1.1.x, by:
38 * Mark Lord (mlord@pobox.com) (IDE Perf.Pkg)
39 * Delman Lee (delman@ieee.org) ("Mr. atdisk2")
40 * Scott Snyder (snyder@fnald0.fnal.gov) (ATAPI IDE cd-rom)
42 * This was a rewrite of just about everything from hd.c, though some original
43 * code is still sprinkled about. Think of it as a major evolution, with
44 * inspiration from lots of linux users, esp. hamish@zot.apana.org.au
47 #include <linux/module.h>
48 #include <linux/types.h>
49 #include <linux/string.h>
50 #include <linux/kernel.h>
51 #include <linux/interrupt.h>
52 #include <linux/major.h>
53 #include <linux/errno.h>
54 #include <linux/genhd.h>
55 #include <linux/slab.h>
56 #include <linux/init.h>
57 #include <linux/pci.h>
58 #include <linux/ide.h>
59 #include <linux/hdreg.h>
60 #include <linux/completion.h>
61 #include <linux/device.h>
64 /* default maximum number of failures */
65 #define IDE_DEFAULT_MAX_FAILURES 1
67 struct class *ide_port_class;
69 static const u8 ide_hwif_to_major[] = { IDE0_MAJOR, IDE1_MAJOR,
70 IDE2_MAJOR, IDE3_MAJOR,
71 IDE4_MAJOR, IDE5_MAJOR,
72 IDE6_MAJOR, IDE7_MAJOR,
73 IDE8_MAJOR, IDE9_MAJOR };
75 DEFINE_MUTEX(ide_cfg_mtx);
77 __cacheline_aligned_in_smp DEFINE_SPINLOCK(ide_lock);
78 EXPORT_SYMBOL(ide_lock);
80 static void ide_port_init_devices_data(ide_hwif_t *);
83 * Do not even *think* about calling this!
85 void ide_init_port_data(ide_hwif_t *hwif, unsigned int index)
87 /* bulk initialize hwif & drive info with zeros */
88 memset(hwif, 0, sizeof(ide_hwif_t));
90 /* fill in any non-zero initial values */
92 hwif->major = ide_hwif_to_major[index];
97 hwif->name[3] = '0' + index;
99 init_completion(&hwif->gendev_rel_comp);
101 hwif->tp_ops = &default_tp_ops;
103 ide_port_init_devices_data(hwif);
106 static void ide_port_init_devices_data(ide_hwif_t *hwif)
110 for (unit = 0; unit < MAX_DRIVES; ++unit) {
111 ide_drive_t *drive = &hwif->drives[unit];
112 u8 j = (hwif->index * MAX_DRIVES) + unit;
114 memset(drive, 0, sizeof(*drive));
116 drive->media = ide_disk;
117 drive->select = (unit << 4) | ATA_DEVICE_OBS;
119 drive->ready_stat = ATA_DRDY;
120 drive->bad_wstat = BAD_W_STAT;
121 drive->special.b.recalibrate = 1;
122 drive->special.b.set_geometry = 1;
123 drive->name[0] = 'h';
124 drive->name[1] = 'd';
125 drive->name[2] = 'a' + j;
126 drive->max_failures = IDE_DEFAULT_MAX_FAILURES;
128 INIT_LIST_HEAD(&drive->list);
129 init_completion(&drive->gendev_rel_comp);
133 /* Called with ide_lock held. */
134 static void __ide_port_unregister_devices(ide_hwif_t *hwif)
138 for (i = 0; i < MAX_DRIVES; i++) {
139 ide_drive_t *drive = &hwif->drives[i];
141 if (drive->dev_flags & IDE_DFLAG_PRESENT) {
142 spin_unlock_irq(&ide_lock);
143 device_unregister(&drive->gendev);
144 wait_for_completion(&drive->gendev_rel_comp);
145 spin_lock_irq(&ide_lock);
150 void ide_port_unregister_devices(ide_hwif_t *hwif)
152 mutex_lock(&ide_cfg_mtx);
153 spin_lock_irq(&ide_lock);
154 __ide_port_unregister_devices(hwif);
156 ide_port_init_devices_data(hwif);
157 spin_unlock_irq(&ide_lock);
158 mutex_unlock(&ide_cfg_mtx);
160 EXPORT_SYMBOL_GPL(ide_port_unregister_devices);
163 * ide_unregister - free an IDE interface
164 * @hwif: IDE interface
166 * Perform the final unregister of an IDE interface. At the moment
167 * we don't refcount interfaces so this will also get split up.
170 * The caller must not hold the IDE locks
171 * The drive present/vanishing is not yet properly locked
172 * Take care with the callbacks. These have been split to avoid
173 * deadlocking the IDE layer. The shutdown callback is called
174 * before we take the lock and free resources. It is up to the
175 * caller to be sure there is no pending I/O here, and that
176 * the interface will not be reopened (present/vanishing locking
177 * isn't yet done BTW). After we commit to the final kill we
178 * call the cleanup callback with the ide locks held.
180 * Unregister restores the hwif structures to the default state.
181 * This is raving bonkers.
184 void ide_unregister(ide_hwif_t *hwif)
187 ide_hwgroup_t *hwgroup;
190 BUG_ON(in_interrupt());
191 BUG_ON(irqs_disabled());
193 mutex_lock(&ide_cfg_mtx);
195 spin_lock_irq(&ide_lock);
197 __ide_port_unregister_devices(hwif);
200 spin_unlock_irq(&ide_lock);
202 ide_proc_unregister_port(hwif);
204 hwgroup = hwif->hwgroup;
206 * free the irq if we were the only hwif using it
210 if (g->irq == hwif->irq)
213 } while (g != hwgroup->hwif);
215 free_irq(hwif->irq, hwgroup);
217 ide_remove_port_from_hwgroup(hwif);
219 device_unregister(hwif->portdev);
220 device_unregister(&hwif->gendev);
221 wait_for_completion(&hwif->gendev_rel_comp);
224 * Remove us from the kernel's knowledge
226 blk_unregister_region(MKDEV(hwif->major, 0), MAX_DRIVES<<PARTN_BITS);
227 kfree(hwif->sg_table);
228 unregister_blkdev(hwif->major, hwif->name);
230 ide_release_dma_engine(hwif);
232 mutex_unlock(&ide_cfg_mtx);
235 void ide_init_port_hw(ide_hwif_t *hwif, hw_regs_t *hw)
237 memcpy(&hwif->io_ports, &hw->io_ports, sizeof(hwif->io_ports));
239 hwif->chipset = hw->chipset;
241 hwif->gendev.parent = hw->parent ? hw->parent : hw->dev;
242 hwif->ack_intr = hw->ack_intr;
243 hwif->config_data = hw->config;
247 * Locks for IDE setting functionality
250 DEFINE_MUTEX(ide_setting_mtx);
252 ide_devset_get(io_32bit, io_32bit);
254 static int set_io_32bit(ide_drive_t *drive, int arg)
256 if (drive->dev_flags & IDE_DFLAG_NO_IO_32BIT)
259 if (arg < 0 || arg > 1 + (SUPPORT_VLB_SYNC << 1))
262 drive->io_32bit = arg;
267 ide_devset_get_flag(ksettings, IDE_DFLAG_KEEP_SETTINGS);
269 static int set_ksettings(ide_drive_t *drive, int arg)
271 if (arg < 0 || arg > 1)
275 drive->dev_flags |= IDE_DFLAG_KEEP_SETTINGS;
277 drive->dev_flags &= ~IDE_DFLAG_KEEP_SETTINGS;
282 ide_devset_get_flag(using_dma, IDE_DFLAG_USING_DMA);
284 static int set_using_dma(ide_drive_t *drive, int arg)
286 #ifdef CONFIG_BLK_DEV_IDEDMA
289 if (arg < 0 || arg > 1)
292 if (ata_id_has_dma(drive->id) == 0)
295 if (drive->hwif->dma_ops == NULL)
301 if (ide_set_dma(drive))
309 if (arg < 0 || arg > 1)
317 * handle HDIO_SET_PIO_MODE ioctl abusers here, eventually it will go away
319 static int set_pio_mode_abuse(ide_hwif_t *hwif, u8 req_pio)
328 return (hwif->host_flags & IDE_HFLAG_ABUSE_DMA_MODES) ? 1 : 0;
331 return (hwif->host_flags & IDE_HFLAG_ABUSE_PREFETCH) ? 1 : 0;
334 return (hwif->host_flags & IDE_HFLAG_ABUSE_FAST_DEVSEL) ? 1 : 0;
340 static int set_pio_mode(ide_drive_t *drive, int arg)
342 ide_hwif_t *hwif = drive->hwif;
343 const struct ide_port_ops *port_ops = hwif->port_ops;
345 if (arg < 0 || arg > 255)
348 if (port_ops == NULL || port_ops->set_pio_mode == NULL ||
349 (hwif->host_flags & IDE_HFLAG_NO_SET_MODE))
352 if (set_pio_mode_abuse(drive->hwif, arg)) {
353 if (arg == 8 || arg == 9) {
356 /* take lock for IDE_DFLAG_[NO_]UNMASK/[NO_]IO_32BIT */
357 spin_lock_irqsave(&ide_lock, flags);
358 port_ops->set_pio_mode(drive, arg);
359 spin_unlock_irqrestore(&ide_lock, flags);
361 port_ops->set_pio_mode(drive, arg);
363 int keep_dma = !!(drive->dev_flags & IDE_DFLAG_USING_DMA);
365 ide_set_pio(drive, arg);
367 if (hwif->host_flags & IDE_HFLAG_SET_PIO_MODE_KEEP_DMA) {
376 ide_devset_get_flag(unmaskirq, IDE_DFLAG_UNMASK);
378 static int set_unmaskirq(ide_drive_t *drive, int arg)
380 if (drive->dev_flags & IDE_DFLAG_NO_UNMASK)
383 if (arg < 0 || arg > 1)
387 drive->dev_flags |= IDE_DFLAG_UNMASK;
389 drive->dev_flags &= ~IDE_DFLAG_UNMASK;
394 ide_ext_devset_rw_sync(io_32bit, io_32bit);
395 ide_ext_devset_rw_sync(keepsettings, ksettings);
396 ide_ext_devset_rw_sync(unmaskirq, unmaskirq);
397 ide_ext_devset_rw_sync(using_dma, using_dma);
398 __IDE_DEVSET(pio_mode, DS_SYNC, NULL, set_pio_mode);
400 static int generic_ide_suspend(struct device *dev, pm_message_t mesg)
402 ide_drive_t *drive = dev->driver_data, *pair = ide_get_pair_dev(drive);
403 ide_hwif_t *hwif = HWIF(drive);
405 struct request_pm_state rqpm;
409 /* call ACPI _GTM only once */
410 if ((drive->dn & 1) == 0 || pair == NULL)
411 ide_acpi_get_timing(hwif);
413 memset(&rqpm, 0, sizeof(rqpm));
414 memset(&args, 0, sizeof(args));
415 rq = blk_get_request(drive->queue, READ, __GFP_WAIT);
416 rq->cmd_type = REQ_TYPE_PM_SUSPEND;
419 rqpm.pm_step = IDE_PM_START_SUSPEND;
420 if (mesg.event == PM_EVENT_PRETHAW)
421 mesg.event = PM_EVENT_FREEZE;
422 rqpm.pm_state = mesg.event;
424 ret = blk_execute_rq(drive->queue, NULL, rq, 0);
427 /* call ACPI _PS3 only after both devices are suspended */
428 if (ret == 0 && ((drive->dn & 1) || pair == NULL))
429 ide_acpi_set_state(hwif, 0);
434 static int generic_ide_resume(struct device *dev)
436 ide_drive_t *drive = dev->driver_data, *pair = ide_get_pair_dev(drive);
437 ide_hwif_t *hwif = HWIF(drive);
439 struct request_pm_state rqpm;
443 /* call ACPI _PS0 / _STM only once */
444 if ((drive->dn & 1) == 0 || pair == NULL) {
445 ide_acpi_set_state(hwif, 1);
446 ide_acpi_push_timing(hwif);
449 ide_acpi_exec_tfs(drive);
451 memset(&rqpm, 0, sizeof(rqpm));
452 memset(&args, 0, sizeof(args));
453 rq = blk_get_request(drive->queue, READ, __GFP_WAIT);
454 rq->cmd_type = REQ_TYPE_PM_RESUME;
455 rq->cmd_flags |= REQ_PREEMPT;
458 rqpm.pm_step = IDE_PM_START_RESUME;
459 rqpm.pm_state = PM_EVENT_ON;
461 err = blk_execute_rq(drive->queue, NULL, rq, 1);
464 if (err == 0 && dev->driver) {
465 ide_driver_t *drv = to_ide_driver(dev->driver);
475 * ide_device_get - get an additional reference to a ide_drive_t
476 * @drive: device to get a reference to
478 * Gets a reference to the ide_drive_t and increments the use count of the
479 * underlying LLDD module.
481 int ide_device_get(ide_drive_t *drive)
483 struct device *host_dev;
484 struct module *module;
486 if (!get_device(&drive->gendev))
489 host_dev = drive->hwif->host->dev[0];
490 module = host_dev ? host_dev->driver->owner : NULL;
492 if (module && !try_module_get(module)) {
493 put_device(&drive->gendev);
499 EXPORT_SYMBOL_GPL(ide_device_get);
502 * ide_device_put - release a reference to a ide_drive_t
503 * @drive: device to release a reference on
505 * Release a reference to the ide_drive_t and decrements the use count of
506 * the underlying LLDD module.
508 void ide_device_put(ide_drive_t *drive)
510 #ifdef CONFIG_MODULE_UNLOAD
511 struct device *host_dev = drive->hwif->host->dev[0];
512 struct module *module = host_dev ? host_dev->driver->owner : NULL;
517 put_device(&drive->gendev);
519 EXPORT_SYMBOL_GPL(ide_device_put);
521 static int ide_bus_match(struct device *dev, struct device_driver *drv)
526 static char *media_string(ide_drive_t *drive)
528 switch (drive->media) {
544 static ssize_t media_show(struct device *dev, struct device_attribute *attr, char *buf)
546 ide_drive_t *drive = to_ide_device(dev);
547 return sprintf(buf, "%s\n", media_string(drive));
550 static ssize_t drivename_show(struct device *dev, struct device_attribute *attr, char *buf)
552 ide_drive_t *drive = to_ide_device(dev);
553 return sprintf(buf, "%s\n", drive->name);
556 static ssize_t modalias_show(struct device *dev, struct device_attribute *attr, char *buf)
558 ide_drive_t *drive = to_ide_device(dev);
559 return sprintf(buf, "ide:m-%s\n", media_string(drive));
562 static ssize_t model_show(struct device *dev, struct device_attribute *attr,
565 ide_drive_t *drive = to_ide_device(dev);
566 return sprintf(buf, "%s\n", (char *)&drive->id[ATA_ID_PROD]);
569 static ssize_t firmware_show(struct device *dev, struct device_attribute *attr,
572 ide_drive_t *drive = to_ide_device(dev);
573 return sprintf(buf, "%s\n", (char *)&drive->id[ATA_ID_FW_REV]);
576 static ssize_t serial_show(struct device *dev, struct device_attribute *attr,
579 ide_drive_t *drive = to_ide_device(dev);
580 return sprintf(buf, "%s\n", (char *)&drive->id[ATA_ID_SERNO]);
583 static struct device_attribute ide_dev_attrs[] = {
585 __ATTR_RO(drivename),
589 __ATTR(serial, 0400, serial_show, NULL),
590 __ATTR(unload_heads, 0644, ide_park_show, ide_park_store),
594 static int ide_uevent(struct device *dev, struct kobj_uevent_env *env)
596 ide_drive_t *drive = to_ide_device(dev);
598 add_uevent_var(env, "MEDIA=%s", media_string(drive));
599 add_uevent_var(env, "DRIVENAME=%s", drive->name);
600 add_uevent_var(env, "MODALIAS=ide:m-%s", media_string(drive));
604 static int generic_ide_probe(struct device *dev)
606 ide_drive_t *drive = to_ide_device(dev);
607 ide_driver_t *drv = to_ide_driver(dev->driver);
609 return drv->probe ? drv->probe(drive) : -ENODEV;
612 static int generic_ide_remove(struct device *dev)
614 ide_drive_t *drive = to_ide_device(dev);
615 ide_driver_t *drv = to_ide_driver(dev->driver);
623 static void generic_ide_shutdown(struct device *dev)
625 ide_drive_t *drive = to_ide_device(dev);
626 ide_driver_t *drv = to_ide_driver(dev->driver);
628 if (dev->driver && drv->shutdown)
629 drv->shutdown(drive);
632 struct bus_type ide_bus_type = {
634 .match = ide_bus_match,
635 .uevent = ide_uevent,
636 .probe = generic_ide_probe,
637 .remove = generic_ide_remove,
638 .shutdown = generic_ide_shutdown,
639 .dev_attrs = ide_dev_attrs,
640 .suspend = generic_ide_suspend,
641 .resume = generic_ide_resume,
644 EXPORT_SYMBOL_GPL(ide_bus_type);
647 EXPORT_SYMBOL_GPL(ide_vlb_clk);
649 module_param_named(vlb_clock, ide_vlb_clk, int, 0);
650 MODULE_PARM_DESC(vlb_clock, "VLB clock frequency (in MHz)");
653 EXPORT_SYMBOL_GPL(ide_pci_clk);
655 module_param_named(pci_clock, ide_pci_clk, int, 0);
656 MODULE_PARM_DESC(pci_clock, "PCI bus clock frequency (in MHz)");
658 static int ide_set_dev_param_mask(const char *s, struct kernel_param *kp)
661 unsigned int *dev_param_mask = (unsigned int *)kp->arg;
663 if (sscanf(s, "%d.%d:%d", &a, &b, &j) != 3 &&
664 sscanf(s, "%d.%d", &a, &b) != 2)
667 i = a * MAX_DRIVES + b;
669 if (i >= MAX_HWIFS * MAX_DRIVES || j < 0 || j > 1)
673 *dev_param_mask |= (1 << i);
675 *dev_param_mask &= (1 << i);
680 static unsigned int ide_nodma;
682 module_param_call(nodma, ide_set_dev_param_mask, NULL, &ide_nodma, 0);
683 MODULE_PARM_DESC(nodma, "disallow DMA for a device");
685 static unsigned int ide_noflush;
687 module_param_call(noflush, ide_set_dev_param_mask, NULL, &ide_noflush, 0);
688 MODULE_PARM_DESC(noflush, "disable flush requests for a device");
690 static unsigned int ide_noprobe;
692 module_param_call(noprobe, ide_set_dev_param_mask, NULL, &ide_noprobe, 0);
693 MODULE_PARM_DESC(noprobe, "skip probing for a device");
695 static unsigned int ide_nowerr;
697 module_param_call(nowerr, ide_set_dev_param_mask, NULL, &ide_nowerr, 0);
698 MODULE_PARM_DESC(nowerr, "ignore the ATA_DF bit for a device");
700 static unsigned int ide_cdroms;
702 module_param_call(cdrom, ide_set_dev_param_mask, NULL, &ide_cdroms, 0);
703 MODULE_PARM_DESC(cdrom, "force device as a CD-ROM");
711 static unsigned int ide_disks;
712 static struct chs_geom ide_disks_chs[MAX_HWIFS * MAX_DRIVES];
714 static int ide_set_disk_chs(const char *str, struct kernel_param *kp)
716 int a, b, c = 0, h = 0, s = 0, i, j = 1;
718 if (sscanf(str, "%d.%d:%d,%d,%d", &a, &b, &c, &h, &s) != 5 &&
719 sscanf(str, "%d.%d:%d", &a, &b, &j) != 3)
722 i = a * MAX_DRIVES + b;
724 if (i >= MAX_HWIFS * MAX_DRIVES || j < 0 || j > 1)
727 if (c > INT_MAX || h > 255 || s > 255)
731 ide_disks |= (1 << i);
733 ide_disks &= (1 << i);
735 ide_disks_chs[i].cyl = c;
736 ide_disks_chs[i].head = h;
737 ide_disks_chs[i].sect = s;
742 module_param_call(chs, ide_set_disk_chs, NULL, NULL, 0);
743 MODULE_PARM_DESC(chs, "force device as a disk (using CHS)");
745 static void ide_dev_apply_params(ide_drive_t *drive, u8 unit)
747 int i = drive->hwif->index * MAX_DRIVES + unit;
749 if (ide_nodma & (1 << i)) {
750 printk(KERN_INFO "ide: disallowing DMA for %s\n", drive->name);
751 drive->dev_flags |= IDE_DFLAG_NODMA;
753 if (ide_noflush & (1 << i)) {
754 printk(KERN_INFO "ide: disabling flush requests for %s\n",
756 drive->dev_flags |= IDE_DFLAG_NOFLUSH;
758 if (ide_noprobe & (1 << i)) {
759 printk(KERN_INFO "ide: skipping probe for %s\n", drive->name);
760 drive->dev_flags |= IDE_DFLAG_NOPROBE;
762 if (ide_nowerr & (1 << i)) {
763 printk(KERN_INFO "ide: ignoring the ATA_DF bit for %s\n",
765 drive->bad_wstat = BAD_R_STAT;
767 if (ide_cdroms & (1 << i)) {
768 printk(KERN_INFO "ide: forcing %s as a CD-ROM\n", drive->name);
769 drive->dev_flags |= IDE_DFLAG_PRESENT;
770 drive->media = ide_cdrom;
771 /* an ATAPI device ignores DRDY */
772 drive->ready_stat = 0;
774 if (ide_disks & (1 << i)) {
775 drive->cyl = drive->bios_cyl = ide_disks_chs[i].cyl;
776 drive->head = drive->bios_head = ide_disks_chs[i].head;
777 drive->sect = drive->bios_sect = ide_disks_chs[i].sect;
779 printk(KERN_INFO "ide: forcing %s as a disk (%d/%d/%d)\n",
781 drive->cyl, drive->head, drive->sect);
783 drive->dev_flags |= IDE_DFLAG_FORCED_GEOM | IDE_DFLAG_PRESENT;
784 drive->media = ide_disk;
785 drive->ready_stat = ATA_DRDY;
789 static unsigned int ide_ignore_cable;
791 static int ide_set_ignore_cable(const char *s, struct kernel_param *kp)
795 if (sscanf(s, "%d:%d", &i, &j) != 2 && sscanf(s, "%d", &i) != 1)
798 if (i >= MAX_HWIFS || j < 0 || j > 1)
802 ide_ignore_cable |= (1 << i);
804 ide_ignore_cable &= (1 << i);
809 module_param_call(ignore_cable, ide_set_ignore_cable, NULL, NULL, 0);
810 MODULE_PARM_DESC(ignore_cable, "ignore cable detection");
812 void ide_port_apply_params(ide_hwif_t *hwif)
816 if (ide_ignore_cable & (1 << hwif->index)) {
817 printk(KERN_INFO "ide: ignoring cable detection for %s\n",
819 hwif->cbl = ATA_CBL_PATA40_SHORT;
822 for (i = 0; i < MAX_DRIVES; i++)
823 ide_dev_apply_params(&hwif->drives[i], i);
827 * This is gets invoked once during initialization, to set *everything* up
829 static int __init ide_init(void)
833 printk(KERN_INFO "Uniform Multi-Platform E-IDE driver\n");
835 ret = bus_register(&ide_bus_type);
837 printk(KERN_WARNING "IDE: bus_register error: %d\n", ret);
841 ide_port_class = class_create(THIS_MODULE, "ide_port");
842 if (IS_ERR(ide_port_class)) {
843 ret = PTR_ERR(ide_port_class);
852 bus_unregister(&ide_bus_type);
857 static void __exit ide_exit(void)
861 class_destroy(ide_port_class);
863 bus_unregister(&ide_bus_type);
866 module_init(ide_init);
867 module_exit(ide_exit);
869 MODULE_LICENSE("GPL");