2 pcd.c (c) 1997-8 Grant R. Guenther <grant@torque.net>
3 Under the terms of the GNU General Public License.
5 This is a high-level driver for parallel port ATAPI CD-ROM
6 drives based on chips supported by the paride module.
8 By default, the driver will autoprobe for a single parallel
9 port ATAPI CD-ROM drive, but if their individual parameters are
10 specified, the driver can handle up to 4 drives.
12 The behaviour of the pcd driver can be altered by setting
13 some parameters from the insmod command line. The following
14 parameters are adjustable:
16 drive0 These four arguments can be arrays of
17 drive1 1-6 integers as follows:
19 drive3 <prt>,<pro>,<uni>,<mod>,<slv>,<dly>
23 <prt> is the base of the parallel port address for
24 the corresponding drive. (required)
26 <pro> is the protocol number for the adapter that
27 supports this drive. These numbers are
28 logged by 'paride' when the protocol modules
29 are initialised. (0 if not given)
31 <uni> for those adapters that support chained
32 devices, this is the unit selector for the
33 chain of devices on the given port. It should
34 be zero for devices that don't support chaining.
37 <mod> this can be -1 to choose the best mode, or one
38 of the mode numbers supported by the adapter.
41 <slv> ATAPI CD-ROMs can be jumpered to master or slave.
42 Set this to 0 to choose the master drive, 1 to
43 choose the slave, -1 (the default) to choose the
46 <dly> some parallel ports require the driver to
47 go more slowly. -1 sets a default value that
48 should work with the chosen protocol. Otherwise,
49 set this to a small integer, the larger it is
50 the slower the port i/o. In some cases, setting
51 this to zero will speed up the device. (default -1)
53 major You may use this parameter to overide the
54 default major number (46) that this driver
55 will use. Be sure to change the device
58 name This parameter is a character string that
59 contains the name the kernel will use for this
60 device (in /proc output, for instance).
63 verbose This parameter controls the amount of logging
64 that the driver will do. Set it to 0 for
65 normal operation, 1 to see autoprobe progress
66 messages, or 2 to see additional debugging
69 nice This parameter controls the driver's use of
70 idle CPU time, at the expense of some speed.
72 If this driver is built into the kernel, you can use kernel
73 the following command line parameters, with the same values
74 as the corresponding module parameters listed above:
82 In addition, you can use the parameter pcd.disable to disable
89 1.01 GRG 1998.01.24 Added test unit ready support
90 1.02 GRG 1998.05.06 Changes to pcd_completion, ready_wait,
91 and loosen interpretation of ATAPI
92 standard for clearing error status.
93 Use spinlocks. Eliminate sti().
94 1.03 GRG 1998.06.16 Eliminated an Ugh
95 1.04 GRG 1998.08.15 Added extra debugging, improvements to
96 pcd_completion, use HZ in loop timing
97 1.05 GRG 1998.08.16 Conformed to "Uniform CD-ROM" standard
98 1.06 GRG 1998.08.19 Added audio ioctl support
99 1.07 GRG 1998.09.24 Increased reset timeout, added jumbo support
103 #define PCD_VERSION "1.07"
105 #define PCD_NAME "pcd"
108 /* Here are things one can override from the insmod command.
109 Most are autoprobed by paride unless set here. Verbose is off
114 static int verbose = 0;
115 static int major = PCD_MAJOR;
116 static char *name = PCD_NAME;
118 static int disable = 0;
120 static int drive0[6] = { 0, 0, 0, -1, -1, -1 };
121 static int drive1[6] = { 0, 0, 0, -1, -1, -1 };
122 static int drive2[6] = { 0, 0, 0, -1, -1, -1 };
123 static int drive3[6] = { 0, 0, 0, -1, -1, -1 };
125 static int (*drives[4])[6] = {&drive0, &drive1, &drive2, &drive3};
126 static int pcd_drive_count;
128 enum {D_PRT, D_PRO, D_UNI, D_MOD, D_SLV, D_DLY};
130 /* end of parameters */
132 #include <linux/module.h>
133 #include <linux/init.h>
134 #include <linux/errno.h>
135 #include <linux/fs.h>
136 #include <linux/kernel.h>
137 #include <linux/delay.h>
138 #include <linux/cdrom.h>
139 #include <linux/spinlock.h>
140 #include <linux/blkdev.h>
141 #include <asm/uaccess.h>
143 static DEFINE_SPINLOCK(pcd_lock);
145 module_param(verbose, bool, 0644);
146 module_param(major, int, 0);
147 module_param(name, charp, 0);
148 module_param(nice, int, 0);
149 module_param_array(drive0, int, NULL, 0);
150 module_param_array(drive1, int, NULL, 0);
151 module_param_array(drive2, int, NULL, 0);
152 module_param_array(drive3, int, NULL, 0);
157 #define PCD_RETRIES 5
158 #define PCD_TMO 800 /* timeout in jiffies */
159 #define PCD_DELAY 50 /* spin delay in uS */
160 #define PCD_READY_TMO 20 /* in seconds */
161 #define PCD_RESET_TMO 100 /* in tenths of a second */
163 #define PCD_SPIN (1000000*PCD_TMO)/(HZ*PCD_DELAY)
167 #define IDE_READY 0x40
168 #define IDE_BUSY 0x80
170 static int pcd_open(struct cdrom_device_info *cdi, int purpose);
171 static void pcd_release(struct cdrom_device_info *cdi);
172 static int pcd_drive_status(struct cdrom_device_info *cdi, int slot_nr);
173 static int pcd_media_changed(struct cdrom_device_info *cdi, int slot_nr);
174 static int pcd_tray_move(struct cdrom_device_info *cdi, int position);
175 static int pcd_lock_door(struct cdrom_device_info *cdi, int lock);
176 static int pcd_drive_reset(struct cdrom_device_info *cdi);
177 static int pcd_get_mcn(struct cdrom_device_info *cdi, struct cdrom_mcn *mcn);
178 static int pcd_audio_ioctl(struct cdrom_device_info *cdi,
179 unsigned int cmd, void *arg);
180 static int pcd_packet(struct cdrom_device_info *cdi,
181 struct packet_command *cgc);
183 static int pcd_detect(void);
184 static void pcd_probe_capabilities(void);
185 static void do_pcd_read_drq(void);
186 static void do_pcd_request(struct request_queue * q);
187 static void do_pcd_read(void);
190 struct pi_adapter pia; /* interface to paride layer */
191 struct pi_adapter *pi;
192 int drive; /* master/slave */
193 int last_sense; /* result of last request sense */
194 int changed; /* media change seen */
195 int present; /* does this unit exist ? */
196 char *name; /* pcd0, pcd1, etc */
197 struct cdrom_device_info info; /* uniform cdrom interface */
198 struct gendisk *disk;
201 static struct pcd_unit pcd[PCD_UNITS];
203 static char pcd_scratch[64];
204 static char pcd_buffer[2048]; /* raw block buffer */
205 static int pcd_bufblk = -1; /* block in buffer, in CD units,
206 -1 for nothing there. See also
210 /* the variables below are used mainly in the I/O request engine, which
211 processes only one request at a time.
214 static struct pcd_unit *pcd_current; /* current request's drive */
215 static struct request *pcd_req;
216 static int pcd_retries; /* retries on current request */
217 static int pcd_busy; /* request being processed ? */
218 static int pcd_sector; /* address of next requested sector */
219 static int pcd_count; /* number of blocks still to do */
220 static char *pcd_buf; /* buffer for request in progress */
222 static int pcd_warned; /* Have we logged a phase warning ? */
224 /* kernel glue structures */
226 static int pcd_block_open(struct inode *inode, struct file *file)
228 struct pcd_unit *cd = inode->i_bdev->bd_disk->private_data;
229 return cdrom_open(&cd->info, inode, file);
232 static int pcd_block_release(struct inode *inode, struct file *file)
234 struct pcd_unit *cd = inode->i_bdev->bd_disk->private_data;
235 return cdrom_release(&cd->info, file);
238 static int pcd_block_ioctl(struct inode *inode, struct file *file,
239 unsigned cmd, unsigned long arg)
241 struct pcd_unit *cd = inode->i_bdev->bd_disk->private_data;
242 return cdrom_ioctl(file, &cd->info, inode, cmd, arg);
245 static int pcd_block_media_changed(struct gendisk *disk)
247 struct pcd_unit *cd = disk->private_data;
248 return cdrom_media_changed(&cd->info);
251 static struct block_device_operations pcd_bdops = {
252 .owner = THIS_MODULE,
253 .open = pcd_block_open,
254 .release = pcd_block_release,
255 .ioctl = pcd_block_ioctl,
256 .media_changed = pcd_block_media_changed,
259 static struct cdrom_device_ops pcd_dops = {
261 .release = pcd_release,
262 .drive_status = pcd_drive_status,
263 .media_changed = pcd_media_changed,
264 .tray_move = pcd_tray_move,
265 .lock_door = pcd_lock_door,
266 .get_mcn = pcd_get_mcn,
267 .reset = pcd_drive_reset,
268 .audio_ioctl = pcd_audio_ioctl,
269 .generic_packet = pcd_packet,
270 .capability = CDC_CLOSE_TRAY | CDC_OPEN_TRAY | CDC_LOCK |
271 CDC_MCN | CDC_MEDIA_CHANGED | CDC_RESET |
272 CDC_PLAY_AUDIO | CDC_GENERIC_PACKET | CDC_CD_R |
276 static void pcd_init_units(void)
282 for (unit = 0, cd = pcd; unit < PCD_UNITS; unit++, cd++) {
283 struct gendisk *disk = alloc_disk(1);
291 cd->drive = (*drives[unit])[D_SLV];
292 if ((*drives[unit])[D_PRT])
295 cd->name = &cd->info.name[0];
296 snprintf(cd->name, sizeof(cd->info.name), "%s%d", name, unit);
297 cd->info.ops = &pcd_dops;
298 cd->info.handle = cd;
300 cd->info.capacity = 1;
303 disk->first_minor = unit;
304 strcpy(disk->disk_name, cd->name); /* umm... */
305 disk->fops = &pcd_bdops;
309 static int pcd_open(struct cdrom_device_info *cdi, int purpose)
311 struct pcd_unit *cd = cdi->handle;
317 static void pcd_release(struct cdrom_device_info *cdi)
321 static inline int status_reg(struct pcd_unit *cd)
323 return pi_read_regr(cd->pi, 1, 6);
326 static inline int read_reg(struct pcd_unit *cd, int reg)
328 return pi_read_regr(cd->pi, 0, reg);
331 static inline void write_reg(struct pcd_unit *cd, int reg, int val)
333 pi_write_regr(cd->pi, 0, reg, val);
336 static int pcd_wait(struct pcd_unit *cd, int go, int stop, char *fun, char *msg)
341 while ((((r = status_reg(cd)) & go) || (stop && (!(r & stop))))
345 if ((r & (IDE_ERR & stop)) || (j >= PCD_SPIN)) {
352 printk("%s: %s %s: alt=0x%x stat=0x%x err=0x%x"
353 " loop=%d phase=%d\n",
354 cd->name, fun, msg, r, s, e, j, p);
360 static int pcd_command(struct pcd_unit *cd, char *cmd, int dlen, char *fun)
364 write_reg(cd, 6, 0xa0 + 0x10 * cd->drive);
366 if (pcd_wait(cd, IDE_BUSY | IDE_DRQ, 0, fun, "before command")) {
367 pi_disconnect(cd->pi);
371 write_reg(cd, 4, dlen % 256);
372 write_reg(cd, 5, dlen / 256);
373 write_reg(cd, 7, 0xa0); /* ATAPI packet command */
375 if (pcd_wait(cd, IDE_BUSY, IDE_DRQ, fun, "command DRQ")) {
376 pi_disconnect(cd->pi);
380 if (read_reg(cd, 2) != 1) {
381 printk("%s: %s: command phase error\n", cd->name, fun);
382 pi_disconnect(cd->pi);
386 pi_write_block(cd->pi, cmd, 12);
391 static int pcd_completion(struct pcd_unit *cd, char *buf, char *fun)
393 int r, d, p, n, k, j;
399 if (!pcd_wait(cd, IDE_BUSY, IDE_DRQ | IDE_READY | IDE_ERR,
400 fun, "completion")) {
402 while (read_reg(cd, 7) & IDE_DRQ) {
403 d = read_reg(cd, 4) + 256 * read_reg(cd, 5);
404 n = (d + 3) & 0xfffc;
405 p = read_reg(cd, 2) & 3;
407 if ((p == 2) && (n > 0) && (j == 0)) {
408 pi_read_block(cd->pi, buf, n);
410 printk("%s: %s: Read %d bytes\n",
417 ("%s: %s: Unexpected phase %d, d=%d, k=%d\n",
418 cd->name, fun, p, d, k);
419 if ((verbose < 2) && !pcd_warned) {
422 ("%s: WARNING: ATAPI phase errors\n",
428 printk("%s: Stuck DRQ\n", cd->name);
432 (cd, IDE_BUSY, IDE_DRQ | IDE_READY | IDE_ERR, fun,
440 pi_disconnect(cd->pi);
445 static void pcd_req_sense(struct pcd_unit *cd, char *fun)
447 char rs_cmd[12] = { 0x03, 0, 0, 0, 16, 0, 0, 0, 0, 0, 0, 0 };
451 r = pcd_command(cd, rs_cmd, 16, "Request sense");
454 pcd_completion(cd, buf, "Request sense");
460 printk("%s: %s: Sense key: %x, ASC: %x, ASQ: %x\n",
461 cd->name, fun, buf[2] & 0xf, buf[12], buf[13]);
464 c | ((buf[12] & 0xff) << 8) | ((buf[13] & 0xff) << 16);
466 if ((c == 2) || (c == 6))
470 static int pcd_atapi(struct pcd_unit *cd, char *cmd, int dlen, char *buf, char *fun)
474 r = pcd_command(cd, cmd, dlen, fun);
477 r = pcd_completion(cd, buf, fun);
479 pcd_req_sense(cd, fun);
484 static int pcd_packet(struct cdrom_device_info *cdi, struct packet_command *cgc)
486 return pcd_atapi(cdi->handle, cgc->cmd, cgc->buflen, cgc->buffer,
490 #define DBMSG(msg) ((verbose>1)?(msg):NULL)
492 static int pcd_media_changed(struct cdrom_device_info *cdi, int slot_nr)
494 struct pcd_unit *cd = cdi->handle;
495 int res = cd->changed;
501 static int pcd_lock_door(struct cdrom_device_info *cdi, int lock)
503 char un_cmd[12] = { 0x1e, 0, 0, 0, lock, 0, 0, 0, 0, 0, 0, 0 };
505 return pcd_atapi(cdi->handle, un_cmd, 0, pcd_scratch,
506 lock ? "lock door" : "unlock door");
509 static int pcd_tray_move(struct cdrom_device_info *cdi, int position)
511 char ej_cmd[12] = { 0x1b, 0, 0, 0, 3 - position, 0, 0, 0, 0, 0, 0, 0 };
513 return pcd_atapi(cdi->handle, ej_cmd, 0, pcd_scratch,
514 position ? "eject" : "close tray");
517 static void pcd_sleep(int cs)
519 schedule_timeout_interruptible(cs);
522 static int pcd_reset(struct pcd_unit *cd)
525 int expect[5] = { 1, 1, 1, 0x14, 0xeb };
528 write_reg(cd, 6, 0xa0 + 0x10 * cd->drive);
531 pcd_sleep(20 * HZ / 1000); /* delay a bit */
534 while ((k++ < PCD_RESET_TMO) && (status_reg(cd) & IDE_BUSY))
538 for (i = 0; i < 5; i++)
539 flg &= (read_reg(cd, i + 1) == expect[i]);
542 printk("%s: Reset (%d) signature = ", cd->name, k);
543 for (i = 0; i < 5; i++)
544 printk("%3x", read_reg(cd, i + 1));
546 printk(" (incorrect)");
550 pi_disconnect(cd->pi);
554 static int pcd_drive_reset(struct cdrom_device_info *cdi)
556 return pcd_reset(cdi->handle);
559 static int pcd_ready_wait(struct pcd_unit *cd, int tmo)
561 char tr_cmd[12] = { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 };
567 pcd_atapi(cd, tr_cmd, 0, NULL, DBMSG("test unit ready"));
571 if (!(((p & 0xffff) == 0x0402) || ((p & 0xff) == 6)))
576 return 0x000020; /* timeout */
579 static int pcd_drive_status(struct cdrom_device_info *cdi, int slot_nr)
581 char rc_cmd[12] = { 0x25, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 };
582 struct pcd_unit *cd = cdi->handle;
584 if (pcd_ready_wait(cd, PCD_READY_TMO))
585 return CDS_DRIVE_NOT_READY;
586 if (pcd_atapi(cd, rc_cmd, 8, pcd_scratch, DBMSG("check media")))
591 static int pcd_identify(struct pcd_unit *cd, char *id)
594 char id_cmd[12] = { 0x12, 0, 0, 0, 36, 0, 0, 0, 0, 0, 0, 0 };
598 s = pcd_atapi(cd, id_cmd, 36, pcd_buffer, "identify");
602 if ((pcd_buffer[0] & 0x1f) != 5) {
604 printk("%s: %s is not a CD-ROM\n",
605 cd->name, cd->drive ? "Slave" : "Master");
608 memcpy(id, pcd_buffer + 16, 16);
611 while ((k >= 0) && (id[k] <= 0x20)) {
616 printk("%s: %s: %s\n", cd->name, cd->drive ? "Slave" : "Master", id);
622 * returns 0, with id set if drive is detected
623 * -1, if drive detection failed
625 static int pcd_probe(struct pcd_unit *cd, int ms, char *id)
628 for (cd->drive = 0; cd->drive <= 1; cd->drive++)
629 if (!pcd_reset(cd) && !pcd_identify(cd, id))
633 if (!pcd_reset(cd) && !pcd_identify(cd, id))
639 static void pcd_probe_capabilities(void)
643 char cmd[12] = { 0x5a, 1 << 3, 0x2a, 0, 0, 0, 0, 18, 0, 0, 0, 0 };
646 for (unit = 0, cd = pcd; unit < PCD_UNITS; unit++, cd++) {
649 r = pcd_atapi(cd, cmd, 18, buffer, "mode sense capabilities");
652 /* we should now have the cap page */
653 if ((buffer[11] & 1) == 0)
654 cd->info.mask |= CDC_CD_R;
655 if ((buffer[11] & 2) == 0)
656 cd->info.mask |= CDC_CD_RW;
657 if ((buffer[12] & 1) == 0)
658 cd->info.mask |= CDC_PLAY_AUDIO;
659 if ((buffer[14] & 1) == 0)
660 cd->info.mask |= CDC_LOCK;
661 if ((buffer[14] & 8) == 0)
662 cd->info.mask |= CDC_OPEN_TRAY;
663 if ((buffer[14] >> 6) == 0)
664 cd->info.mask |= CDC_CLOSE_TRAY;
668 static int pcd_detect(void)
674 printk("%s: %s version %s, major %d, nice %d\n",
675 name, name, PCD_VERSION, major, nice);
678 if (pcd_drive_count == 0) { /* nothing spec'd - so autoprobe for 1 */
680 if (pi_init(cd->pi, 1, -1, -1, -1, -1, -1, pcd_buffer,
681 PI_PCD, verbose, cd->name)) {
682 if (!pcd_probe(cd, -1, id) && cd->disk) {
689 for (unit = 0, cd = pcd; unit < PCD_UNITS; unit++, cd++) {
690 int *conf = *drives[unit];
693 if (!pi_init(cd->pi, 0, conf[D_PRT], conf[D_MOD],
694 conf[D_UNI], conf[D_PRO], conf[D_DLY],
695 pcd_buffer, PI_PCD, verbose, cd->name))
697 if (!pcd_probe(cd, conf[D_SLV], id) && cd->disk) {
707 printk("%s: No CD-ROM drive found\n", name);
708 for (unit = 0, cd = pcd; unit < PCD_UNITS; unit++, cd++)
713 /* I/O request processing */
714 static struct request_queue *pcd_queue;
716 static void do_pcd_request(struct request_queue * q)
721 pcd_req = elv_next_request(q);
725 if (rq_data_dir(pcd_req) == READ) {
726 struct pcd_unit *cd = pcd_req->rq_disk->private_data;
727 if (cd != pcd_current)
730 pcd_sector = pcd_req->sector;
731 pcd_count = pcd_req->current_nr_sectors;
732 pcd_buf = pcd_req->buffer;
734 ps_set_intr(do_pcd_read, NULL, 0, nice);
737 end_request(pcd_req, 0);
741 static inline void next_request(int success)
743 unsigned long saved_flags;
745 spin_lock_irqsave(&pcd_lock, saved_flags);
746 end_request(pcd_req, success);
748 do_pcd_request(pcd_queue);
749 spin_unlock_irqrestore(&pcd_lock, saved_flags);
752 static int pcd_ready(void)
754 return (((status_reg(pcd_current) & (IDE_BUSY | IDE_DRQ)) == IDE_DRQ));
757 static void pcd_transfer(void)
760 while (pcd_count && (pcd_sector / 4 == pcd_bufblk)) {
761 int o = (pcd_sector % 4) * 512;
762 memcpy(pcd_buf, pcd_buffer + o, 512);
769 static void pcd_start(void)
772 char rd_cmd[12] = { 0xa8, 0, 0, 0, 0, 0, 0, 0, 0, 1, 0, 0 };
774 pcd_bufblk = pcd_sector / 4;
776 for (i = 0; i < 4; i++) {
777 rd_cmd[5 - i] = b & 0xff;
781 if (pcd_command(pcd_current, rd_cmd, 2048, "read block")) {
789 ps_set_intr(do_pcd_read_drq, pcd_ready, PCD_TMO, nice);
792 static void do_pcd_read(void)
802 pi_do_claimed(pcd_current->pi, pcd_start);
805 static void do_pcd_read_drq(void)
807 unsigned long saved_flags;
809 if (pcd_completion(pcd_current, pcd_buffer, "read block")) {
810 if (pcd_retries < PCD_RETRIES) {
813 pi_do_claimed(pcd_current->pi, pcd_start);
822 spin_lock_irqsave(&pcd_lock, saved_flags);
823 do_pcd_request(pcd_queue);
824 spin_unlock_irqrestore(&pcd_lock, saved_flags);
827 /* the audio_ioctl stuff is adapted from sr_ioctl.c */
829 static int pcd_audio_ioctl(struct cdrom_device_info *cdi, unsigned int cmd, void *arg)
831 struct pcd_unit *cd = cdi->handle;
835 case CDROMREADTOCHDR:
839 { GPCMD_READ_TOC_PMA_ATIP, 0, 0, 0, 0, 0, 0, 0, 12,
841 struct cdrom_tochdr *tochdr =
842 (struct cdrom_tochdr *) arg;
846 r = pcd_atapi(cd, cmd, 12, buffer, "read toc header");
848 tochdr->cdth_trk0 = buffer[2];
849 tochdr->cdth_trk1 = buffer[3];
854 case CDROMREADTOCENTRY:
858 { GPCMD_READ_TOC_PMA_ATIP, 0, 0, 0, 0, 0, 0, 0, 12,
861 struct cdrom_tocentry *tocentry =
862 (struct cdrom_tocentry *) arg;
863 unsigned char buffer[32];
867 (tocentry->cdte_format == CDROM_MSF ? 0x02 : 0);
868 cmd[6] = tocentry->cdte_track;
870 r = pcd_atapi(cd, cmd, 12, buffer, "read toc entry");
872 tocentry->cdte_ctrl = buffer[5] & 0xf;
873 tocentry->cdte_adr = buffer[5] >> 4;
874 tocentry->cdte_datamode =
875 (tocentry->cdte_ctrl & 0x04) ? 1 : 0;
876 if (tocentry->cdte_format == CDROM_MSF) {
877 tocentry->cdte_addr.msf.minute = buffer[9];
878 tocentry->cdte_addr.msf.second = buffer[10];
879 tocentry->cdte_addr.msf.frame = buffer[11];
881 tocentry->cdte_addr.lba =
882 (((((buffer[8] << 8) + buffer[9]) << 8)
883 + buffer[10]) << 8) + buffer[11];
894 static int pcd_get_mcn(struct cdrom_device_info *cdi, struct cdrom_mcn *mcn)
897 { GPCMD_READ_SUBCHANNEL, 0, 0x40, 2, 0, 0, 0, 0, 24, 0, 0, 0 };
900 if (pcd_atapi(cdi->handle, cmd, 24, buffer, "get mcn"))
903 memcpy(mcn->medium_catalog_number, buffer + 9, 13);
904 mcn->medium_catalog_number[13] = 0;
909 static int __init pcd_init(void)
922 /* get the atapi capabilities page */
923 pcd_probe_capabilities();
925 if (register_blkdev(major, name)) {
926 for (unit = 0, cd = pcd; unit < PCD_UNITS; unit++, cd++)
931 pcd_queue = blk_init_queue(do_pcd_request, &pcd_lock);
933 unregister_blkdev(major, name);
934 for (unit = 0, cd = pcd; unit < PCD_UNITS; unit++, cd++)
939 for (unit = 0, cd = pcd; unit < PCD_UNITS; unit++, cd++) {
941 register_cdrom(&cd->info);
942 cd->disk->private_data = cd;
943 cd->disk->queue = pcd_queue;
951 static void __exit pcd_exit(void)
956 for (unit = 0, cd = pcd; unit < PCD_UNITS; unit++, cd++) {
958 del_gendisk(cd->disk);
960 unregister_cdrom(&cd->info);
964 blk_cleanup_queue(pcd_queue);
965 unregister_blkdev(major, name);
968 MODULE_LICENSE("GPL");
969 module_init(pcd_init)
970 module_exit(pcd_exit)