1 /* ppa.c -- low level driver for the IOMEGA PPA3
2 * parallel port SCSI host adapter.
4 * (The PPA3 is the embedded controller in the ZIP drive.)
6 * (c) 1995,1996 Grant R. Guenther, grant@torque.net,
7 * under the terms of the GNU General Public License.
11 #include <linux/init.h>
12 #include <linux/kernel.h>
13 #include <linux/module.h>
14 #include <linux/blkdev.h>
15 #include <linux/parport.h>
16 #include <linux/workqueue.h>
17 #include <linux/delay.h>
18 #include <linux/jiffies.h>
21 #include <scsi/scsi.h>
22 #include <scsi/scsi_cmnd.h>
23 #include <scsi/scsi_device.h>
24 #include <scsi/scsi_host.h>
27 static void ppa_reset_pulse(unsigned int base);
30 struct pardevice *dev; /* Parport device entry */
31 int base; /* Actual port address */
32 int mode; /* Transfer mode */
33 struct scsi_cmnd *cur_cmd; /* Current queued command */
34 struct delayed_work ppa_tq; /* Polling interrupt stuff */
35 unsigned long jstart; /* Jiffies at start */
36 unsigned long recon_tmo; /* How many usecs to wait for reconnection (6th bit) */
37 unsigned int failed:1; /* Failure flag */
38 unsigned wanted:1; /* Parport sharing busy flag */
39 wait_queue_head_t *waiting;
40 struct Scsi_Host *host;
41 struct list_head list;
46 static inline ppa_struct *ppa_dev(struct Scsi_Host *host)
48 return *(ppa_struct **)&host->hostdata;
51 static DEFINE_SPINLOCK(arbitration_lock);
53 static void got_it(ppa_struct *dev)
55 dev->base = dev->dev->port->base;
57 dev->cur_cmd->SCp.phase = 1;
59 wake_up(dev->waiting);
62 static void ppa_wakeup(void *ref)
64 ppa_struct *dev = (ppa_struct *) ref;
67 spin_lock_irqsave(&arbitration_lock, flags);
69 parport_claim(dev->dev);
73 spin_unlock_irqrestore(&arbitration_lock, flags);
77 static int ppa_pb_claim(ppa_struct *dev)
81 spin_lock_irqsave(&arbitration_lock, flags);
82 if (parport_claim(dev->dev) == 0) {
87 spin_unlock_irqrestore(&arbitration_lock, flags);
91 static void ppa_pb_dismiss(ppa_struct *dev)
95 spin_lock_irqsave(&arbitration_lock, flags);
98 spin_unlock_irqrestore(&arbitration_lock, flags);
100 parport_release(dev->dev);
103 static inline void ppa_pb_release(ppa_struct *dev)
105 parport_release(dev->dev);
109 * Start of Chipset kludges
112 /* This is to give the ppa driver a way to modify the timings (and other
113 * parameters) by writing to the /proc/scsi/ppa/0 file.
114 * Very simple method really... (To simple, no error checking :( )
115 * Reason: Kernel hackers HATE having to unload and reload modules for
117 * Also gives a method to use a script to obtain optimum timings (TODO)
120 static inline int ppa_proc_write(ppa_struct *dev, char *buffer, int length)
124 if ((length > 5) && (strncmp(buffer, "mode=", 5) == 0)) {
125 x = simple_strtoul(buffer + 5, NULL, 0);
129 if ((length > 10) && (strncmp(buffer, "recon_tmo=", 10) == 0)) {
130 x = simple_strtoul(buffer + 10, NULL, 0);
132 printk(KERN_INFO "ppa: recon_tmo set to %ld\n", x);
135 printk(KERN_WARNING "ppa /proc: invalid variable\n");
139 static int ppa_proc_info(struct Scsi_Host *host, char *buffer, char **start, off_t offset, int length, int inout)
142 ppa_struct *dev = ppa_dev(host);
145 return ppa_proc_write(dev, buffer, length);
147 len += sprintf(buffer + len, "Version : %s\n", PPA_VERSION);
149 sprintf(buffer + len, "Parport : %s\n",
150 dev->dev->port->name);
152 sprintf(buffer + len, "Mode : %s\n",
153 PPA_MODE_STRING[dev->mode]);
156 sprintf(buffer + len, "recon_tmo : %lu\n", dev->recon_tmo);
159 /* Request for beyond end of buffer */
163 *start = buffer + offset;
170 static int device_check(ppa_struct *dev);
173 #define ppa_fail(x,y) printk("ppa: ppa_fail(%i) from %s at line %d\n",\
174 y, __func__, __LINE__); ppa_fail_func(x,y);
175 static inline void ppa_fail_func(ppa_struct *dev, int error_code)
177 static inline void ppa_fail(ppa_struct *dev, int error_code)
180 /* If we fail a device then we trash status / message bytes */
182 dev->cur_cmd->result = error_code << 16;
188 * Wait for the high bit to be set.
190 * In principle, this could be tied to an interrupt, but the adapter
191 * doesn't appear to be designed to support interrupts. We spin on
192 * the 0x80 ready bit.
194 static unsigned char ppa_wait(ppa_struct *dev)
197 unsigned short ppb = dev->base;
201 /* Wait for bit 6 and 7 - PJC */
202 for (r = r_str(ppb); ((r & 0xc0) != 0xc0) && (k); k--) {
208 * return some status information.
209 * Semantics: 0xc0 = ZIP wants more data
210 * 0xd0 = ZIP wants to send more data
211 * 0xe0 = ZIP is expecting SCSI command data
212 * 0xf0 = end of transfer, ZIP is sending status
217 /* Counter expired - Time out occurred */
218 ppa_fail(dev, DID_TIME_OUT);
219 printk(KERN_WARNING "ppa timeout in ppa_wait\n");
220 return 0; /* command timed out */
224 * Clear EPP Timeout Bit
226 static inline void epp_reset(unsigned short ppb)
232 w_str(ppb, i & 0xfe);
236 * Wait for empty ECP fifo (if we are in ECP fifo mode only)
238 static inline void ecp_sync(ppa_struct *dev)
240 int i, ppb_hi = dev->dev->port->base_hi;
245 if ((r_ecr(ppb_hi) & 0xe0) == 0x60) { /* mode 011 == ECP fifo mode */
246 for (i = 0; i < 100; i++) {
247 if (r_ecr(ppb_hi) & 0x01)
251 printk(KERN_WARNING "ppa: ECP sync failed as data still present in FIFO.\n");
255 static int ppa_byte_out(unsigned short base, const char *buffer, int len)
259 for (i = len; i; i--) {
260 w_dtr(base, *buffer++);
264 return 1; /* All went well - we hope! */
267 static int ppa_byte_in(unsigned short base, char *buffer, int len)
271 for (i = len; i; i--) {
272 *buffer++ = r_dtr(base);
276 return 1; /* All went well - we hope! */
279 static int ppa_nibble_in(unsigned short base, char *buffer, int len)
285 h = r_str(base) & 0xf0;
287 *buffer++ = h | ((r_str(base) & 0xf0) >> 4);
289 return 1; /* All went well - we hope! */
292 static int ppa_out(ppa_struct *dev, char *buffer, int len)
295 unsigned short ppb = dev->base;
299 if ((r & 0x50) != 0x40) {
300 ppa_fail(dev, DID_ERROR);
306 /* 8 bit output, with a loop */
307 r = ppa_byte_out(ppb, buffer, len);
315 #ifdef CONFIG_SCSI_IZIP_EPP16
316 if (!(((long) buffer | len) & 0x01))
317 outsw(ppb + 4, buffer, len >> 1);
319 if (!(((long) buffer | len) & 0x03))
320 outsl(ppb + 4, buffer, len >> 2);
323 outsb(ppb + 4, buffer, len);
325 r = !(r_str(ppb) & 0x01);
331 printk(KERN_ERR "PPA: bug in ppa_out()\n");
337 static int ppa_in(ppa_struct *dev, char *buffer, int len)
340 unsigned short ppb = dev->base;
344 if ((r & 0x50) != 0x50) {
345 ppa_fail(dev, DID_ERROR);
350 /* 4 bit input, with a loop */
351 r = ppa_nibble_in(ppb, buffer, len);
356 /* 8 bit input, with a loop */
358 r = ppa_byte_in(ppb, buffer, len);
368 #ifdef CONFIG_SCSI_IZIP_EPP16
369 if (!(((long) buffer | len) & 0x01))
370 insw(ppb + 4, buffer, len >> 1);
372 if (!(((long) buffer | len) & 0x03))
373 insl(ppb + 4, buffer, len >> 2);
376 insb(ppb + 4, buffer, len);
378 r = !(r_str(ppb) & 0x01);
384 printk(KERN_ERR "PPA: bug in ppa_ins()\n");
391 /* end of ppa_io.h */
392 static inline void ppa_d_pulse(unsigned short ppb, unsigned char b)
402 static void ppa_disconnect(ppa_struct *dev)
404 unsigned short ppb = dev->base;
407 ppa_d_pulse(ppb, 0x3c);
408 ppa_d_pulse(ppb, 0x20);
409 ppa_d_pulse(ppb, 0xf);
412 static inline void ppa_c_pulse(unsigned short ppb, unsigned char b)
421 static inline void ppa_connect(ppa_struct *dev, int flag)
423 unsigned short ppb = dev->base;
426 ppa_c_pulse(ppb, 0x3c);
427 ppa_c_pulse(ppb, 0x20);
428 if ((flag == CONNECT_EPP_MAYBE) && IN_EPP_MODE(dev->mode))
429 ppa_c_pulse(ppb, 0xcf);
431 ppa_c_pulse(ppb, 0x8f);
434 static int ppa_select(ppa_struct *dev, int target)
437 unsigned short ppb = dev->base;
440 * Bit 6 (0x40) is the device selected bit.
441 * First we must wait till the current device goes off line...
447 } while ((r_str(ppb) & 0x40) && (k));
451 w_dtr(ppb, (1 << target));
454 w_dtr(ppb, 0x80); /* This is NOT the initator */
462 while (!(r_str(ppb) & 0x40) && (k));
470 * This is based on a trace of what the Iomega DOS 'guest' driver does.
471 * I've tried several different kinds of parallel ports with guest and
472 * coded this to react in the same ways that it does.
474 * The return value from this function is just a hint about where the
475 * handshaking failed.
478 static int ppa_init(ppa_struct *dev)
481 unsigned short ppb = dev->base;
484 ppa_connect(dev, CONNECT_NORMAL);
486 retv = 2; /* Failed */
489 if ((r_str(ppb) & 0x08) == 0x08)
493 if ((r_str(ppb) & 0x08) == 0x00)
497 ppa_reset_pulse(ppb);
498 udelay(1000); /* Allow devices to settle down */
500 udelay(1000); /* Another delay to allow devices to settle */
505 return device_check(dev);
508 static inline int ppa_send_command(struct scsi_cmnd *cmd)
510 ppa_struct *dev = ppa_dev(cmd->device->host);
513 w_ctr(dev->base, 0x0c);
515 for (k = 0; k < cmd->cmd_len; k++)
516 if (!ppa_out(dev, &cmd->cmnd[k], 1))
522 * The bulk flag enables some optimisations in the data transfer loops,
523 * it should be true for any command that transfers data in integral
524 * numbers of sectors.
526 * The driver appears to remain stable if we speed up the parallel port
527 * i/o in this function, but not elsewhere.
529 static int ppa_completion(struct scsi_cmnd *cmd)
534 * 1 Finished data transfer
536 ppa_struct *dev = ppa_dev(cmd->device->host);
537 unsigned short ppb = dev->base;
538 unsigned long start_jiffies = jiffies;
541 int fast, bulk, status;
544 bulk = ((v == READ_6) ||
545 (v == READ_10) || (v == WRITE_6) || (v == WRITE_10));
548 * We only get here if the drive is ready to comunicate,
549 * hence no need for a full ppa_wait.
551 r = (r_str(ppb) & 0xf0);
553 while (r != (unsigned char) 0xf0) {
555 * If we have been running for more than a full timer tick
558 if (time_after(jiffies, start_jiffies + 1))
561 if ((cmd->SCp.this_residual <= 0)) {
562 ppa_fail(dev, DID_ERROR);
563 return -1; /* ERROR_RETURN */
566 /* On some hardware we have SCSI disconnected (6th bit low)
567 * for about 100usecs. It is too expensive to wait a
568 * tick on every loop so we busy wait for no more than
569 * 500usecs to give the drive a chance first. We do not
570 * change things for "normal" hardware since generally
571 * the 6th bit is always high.
572 * This makes the CPU load higher on some hardware
573 * but otherwise we can not get more than 50K/secs
574 * on this problem hardware.
576 if ((r & 0xc0) != 0xc0) {
577 /* Wait for reconnection should be no more than
578 * jiffy/2 = 5ms = 5000 loops
580 unsigned long k = dev->recon_tmo;
581 for (; k && ((r = (r_str(ppb) & 0xf0)) & 0xc0) != 0xc0;
589 /* determine if we should use burst I/O */
590 fast = (bulk && (cmd->SCp.this_residual >= PPA_BURST_SIZE))
591 ? PPA_BURST_SIZE : 1;
593 if (r == (unsigned char) 0xc0)
594 status = ppa_out(dev, cmd->SCp.ptr, fast);
596 status = ppa_in(dev, cmd->SCp.ptr, fast);
598 cmd->SCp.ptr += fast;
599 cmd->SCp.this_residual -= fast;
602 ppa_fail(dev, DID_BUS_BUSY);
603 return -1; /* ERROR_RETURN */
605 if (cmd->SCp.buffer && !cmd->SCp.this_residual) {
606 /* if scatter/gather, advance to the next segment */
607 if (cmd->SCp.buffers_residual--) {
609 cmd->SCp.this_residual =
610 cmd->SCp.buffer->length;
611 cmd->SCp.ptr = sg_virt(cmd->SCp.buffer);
614 /* Now check to see if the drive is ready to comunicate */
615 r = (r_str(ppb) & 0xf0);
616 /* If not, drop back down to the scheduler and wait a timer tick */
620 return 1; /* FINISH_RETURN */
624 * Since the PPA itself doesn't generate interrupts, we use
625 * the scheduler's task queue to generate a stream of call-backs and
626 * complete the request when the drive is ready.
628 static void ppa_interrupt(struct work_struct *work)
630 ppa_struct *dev = container_of(work, ppa_struct, ppa_tq.work);
631 struct scsi_cmnd *cmd = dev->cur_cmd;
634 printk(KERN_ERR "PPA: bug in ppa_interrupt\n");
637 if (ppa_engine(dev, cmd)) {
638 schedule_delayed_work(&dev->ppa_tq, 1);
641 /* Command must of completed hence it is safe to let go... */
643 switch ((cmd->result >> 16) & 0xff) {
647 printk(KERN_DEBUG "ppa: no device at SCSI ID %i\n", cmd->device->target);
650 printk(KERN_DEBUG "ppa: BUS BUSY - EPP timeout detected\n");
653 printk(KERN_DEBUG "ppa: unknown timeout\n");
656 printk(KERN_DEBUG "ppa: told to abort\n");
659 printk(KERN_DEBUG "ppa: parity error (???)\n");
662 printk(KERN_DEBUG "ppa: internal driver error\n");
665 printk(KERN_DEBUG "ppa: told to reset device\n");
668 printk(KERN_WARNING "ppa: bad interrupt (???)\n");
671 printk(KERN_WARNING "ppa: bad return code (%02x)\n",
672 (cmd->result >> 16) & 0xff);
676 if (cmd->SCp.phase > 1)
686 static int ppa_engine(ppa_struct *dev, struct scsi_cmnd *cmd)
688 unsigned short ppb = dev->base;
689 unsigned char l = 0, h = 0;
692 /* First check for any errors that may of occurred
693 * Here we check for internal errors
698 switch (cmd->SCp.phase) {
699 case 0: /* Phase 0 - Waiting for parport */
700 if (time_after(jiffies, dev->jstart + HZ)) {
702 * We waited more than a second
703 * for parport to call us
705 ppa_fail(dev, DID_BUS_BUSY);
708 return 1; /* wait until ppa_wakeup claims parport */
709 case 1: /* Phase 1 - Connected */
710 { /* Perform a sanity check for cable unplugged */
711 int retv = 2; /* Failed */
713 ppa_connect(dev, CONNECT_EPP_MAYBE);
716 if ((r_str(ppb) & 0x08) == 0x08)
720 if ((r_str(ppb) & 0x08) == 0x00)
724 if (time_after(jiffies, dev->jstart + (1 * HZ))) {
725 printk(KERN_ERR "ppa: Parallel port cable is unplugged.\n");
726 ppa_fail(dev, DID_BUS_BUSY);
730 return 1; /* Try again in a jiffy */
736 case 2: /* Phase 2 - We are now talking to the scsi bus */
737 if (!ppa_select(dev, scmd_id(cmd))) {
738 ppa_fail(dev, DID_NO_CONNECT);
743 case 3: /* Phase 3 - Ready to accept a command */
745 if (!(r_str(ppb) & 0x80))
748 if (!ppa_send_command(cmd))
752 case 4: /* Phase 4 - Setup scatter/gather buffers */
753 if (scsi_bufflen(cmd)) {
754 cmd->SCp.buffer = scsi_sglist(cmd);
755 cmd->SCp.this_residual = cmd->SCp.buffer->length;
756 cmd->SCp.ptr = sg_virt(cmd->SCp.buffer);
758 cmd->SCp.buffer = NULL;
759 cmd->SCp.this_residual = 0;
762 cmd->SCp.buffers_residual = scsi_sg_count(cmd) - 1;
765 case 5: /* Phase 5 - Data transfer stage */
767 if (!(r_str(ppb) & 0x80))
770 retv = ppa_completion(cmd);
777 case 6: /* Phase 6 - Read status/message */
778 cmd->result = DID_OK << 16;
779 /* Check for data overrun */
780 if (ppa_wait(dev) != (unsigned char) 0xf0) {
781 ppa_fail(dev, DID_ERROR);
784 if (ppa_in(dev, &l, 1)) { /* read status byte */
785 /* Check for optional message byte */
786 if (ppa_wait(dev) == (unsigned char) 0xf0)
789 (DID_OK << 16) + (h << 8) + (l & STATUS_MASK);
791 return 0; /* Finished */
795 printk(KERN_ERR "ppa: Invalid scsi phase\n");
800 static int ppa_queuecommand(struct scsi_cmnd *cmd,
801 void (*done) (struct scsi_cmnd *))
803 ppa_struct *dev = ppa_dev(cmd->device->host);
806 printk(KERN_ERR "PPA: bug in ppa_queuecommand\n");
810 dev->jstart = jiffies;
812 cmd->scsi_done = done;
813 cmd->result = DID_ERROR << 16; /* default return code */
814 cmd->SCp.phase = 0; /* bus free */
816 schedule_delayed_work(&dev->ppa_tq, 0);
824 * Apparently the disk->capacity attribute is off by 1 sector
825 * for all disk drives. We add the one here, but it should really
826 * be done in sd.c. Even if it gets fixed there, this will still
829 static int ppa_biosparam(struct scsi_device *sdev, struct block_device *dev,
830 sector_t capacity, int ip[])
834 ip[2] = ((unsigned long) capacity + 1) / (ip[0] * ip[1]);
838 ip[2] = ((unsigned long) capacity + 1) / (ip[0] * ip[1]);
845 static int ppa_abort(struct scsi_cmnd *cmd)
847 ppa_struct *dev = ppa_dev(cmd->device->host);
849 * There is no method for aborting commands since Iomega
850 * have tied the SCSI_MESSAGE line high in the interface
853 switch (cmd->SCp.phase) {
854 case 0: /* Do not have access to parport */
855 case 1: /* Have not connected to interface */
856 dev->cur_cmd = NULL; /* Forget the problem */
859 default: /* SCSI command sent, can not abort */
865 static void ppa_reset_pulse(unsigned int base)
873 static int ppa_reset(struct scsi_cmnd *cmd)
875 ppa_struct *dev = ppa_dev(cmd->device->host);
879 dev->cur_cmd = NULL; /* Forget the problem */
881 ppa_connect(dev, CONNECT_NORMAL);
882 ppa_reset_pulse(dev->base);
883 mdelay(1); /* device settle delay */
885 mdelay(1); /* device settle delay */
889 static int device_check(ppa_struct *dev)
891 /* This routine looks for a device and then attempts to use EPP
892 to send a command. If all goes as planned then EPP is available. */
894 static u8 cmd[6] = { 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 };
895 int loop, old_mode, status, k, ppb = dev->base;
898 old_mode = dev->mode;
899 for (loop = 0; loop < 8; loop++) {
900 /* Attempt to use EPP for Test Unit Ready */
901 if ((ppb & 0x0007) == 0x0000)
902 dev->mode = PPA_EPP_32;
905 ppa_connect(dev, CONNECT_EPP_MAYBE);
906 /* Select SCSI device */
907 if (!ppa_select(dev, loop)) {
911 printk(KERN_INFO "ppa: Found device at ID %i, Attempting to use %s\n",
912 loop, PPA_MODE_STRING[dev->mode]);
914 /* Send SCSI command */
917 for (l = 0; (l < 6) && (status); l++)
918 status = ppa_out(dev, cmd, 1);
922 ppa_connect(dev, CONNECT_EPP_MAYBE);
930 if (dev->mode == PPA_EPP_32) {
931 dev->mode = old_mode;
937 k = 1000000; /* 1 Second */
942 } while (!(l & 0x80) && (k));
948 ppa_connect(dev, CONNECT_EPP_MAYBE);
949 ppa_reset_pulse(ppb);
953 if (dev->mode == PPA_EPP_32) {
954 dev->mode = old_mode;
960 printk(KERN_INFO "ppa: Communication established with ID %i using %s\n",
961 loop, PPA_MODE_STRING[dev->mode]);
962 ppa_connect(dev, CONNECT_EPP_MAYBE);
963 ppa_reset_pulse(ppb);
972 static int ppa_adjust_queue(struct scsi_device *device)
974 blk_queue_bounce_limit(device->request_queue, BLK_BOUNCE_HIGH);
978 static struct scsi_host_template ppa_template = {
979 .module = THIS_MODULE,
981 .proc_info = ppa_proc_info,
982 .name = "Iomega VPI0 (ppa) interface",
983 .queuecommand = ppa_queuecommand,
984 .eh_abort_handler = ppa_abort,
985 .eh_bus_reset_handler = ppa_reset,
986 .eh_host_reset_handler = ppa_reset,
987 .bios_param = ppa_biosparam,
989 .sg_tablesize = SG_ALL,
991 .use_clustering = ENABLE_CLUSTERING,
993 .slave_alloc = ppa_adjust_queue,
996 /***************************************************************************
997 * Parallel port probing routines *
998 ***************************************************************************/
1000 static LIST_HEAD(ppa_hosts);
1002 static int __ppa_attach(struct parport *pb)
1004 struct Scsi_Host *host;
1005 DECLARE_WAIT_QUEUE_HEAD_ONSTACK(waiting);
1009 int modes, ppb, ppb_hi;
1012 dev = kzalloc(sizeof(ppa_struct), GFP_KERNEL);
1016 dev->mode = PPA_AUTODETECT;
1017 dev->recon_tmo = PPA_RECON_TMO;
1018 init_waitqueue_head(&waiting);
1019 dev->dev = parport_register_device(pb, "ppa", NULL, ppa_wakeup,
1025 /* Claim the bus so it remembers what we do to the control
1026 * registers. [ CTR and ECP ]
1029 dev->waiting = &waiting;
1030 prepare_to_wait(&waiting, &wait, TASK_UNINTERRUPTIBLE);
1031 if (ppa_pb_claim(dev))
1032 schedule_timeout(3 * HZ);
1034 printk(KERN_ERR "ppa%d: failed to claim parport because "
1035 "a pardevice is owning the port for too long "
1036 "time!\n", pb->number);
1037 ppa_pb_dismiss(dev);
1038 dev->waiting = NULL;
1039 finish_wait(&waiting, &wait);
1042 dev->waiting = NULL;
1043 finish_wait(&waiting, &wait);
1044 ppb = dev->base = dev->dev->port->base;
1045 ppb_hi = dev->dev->port->base_hi;
1047 modes = dev->dev->port->modes;
1049 /* Mode detection works up the chain of speed
1050 * This avoids a nasty if-then-else-if-... tree
1052 dev->mode = PPA_NIBBLE;
1054 if (modes & PARPORT_MODE_TRISTATE)
1055 dev->mode = PPA_PS2;
1057 if (modes & PARPORT_MODE_ECP) {
1058 w_ecr(ppb_hi, 0x20);
1059 dev->mode = PPA_PS2;
1061 if ((modes & PARPORT_MODE_EPP) && (modes & PARPORT_MODE_ECP))
1062 w_ecr(ppb_hi, 0x80);
1064 /* Done configuration */
1066 err = ppa_init(dev);
1067 ppa_pb_release(dev);
1072 /* now the glue ... */
1073 if (dev->mode == PPA_NIBBLE || dev->mode == PPA_PS2)
1078 INIT_DELAYED_WORK(&dev->ppa_tq, ppa_interrupt);
1081 host = scsi_host_alloc(&ppa_template, sizeof(ppa_struct *));
1084 host->io_port = pb->base;
1085 host->n_io_port = ports;
1086 host->dma_channel = -1;
1087 host->unique_id = pb->number;
1088 *(ppa_struct **)&host->hostdata = dev;
1090 list_add_tail(&dev->list, &ppa_hosts);
1091 err = scsi_add_host(host, NULL);
1094 scsi_scan_host(host);
1097 list_del_init(&dev->list);
1098 scsi_host_put(host);
1100 parport_unregister_device(dev->dev);
1106 static void ppa_attach(struct parport *pb)
1111 static void ppa_detach(struct parport *pb)
1114 list_for_each_entry(dev, &ppa_hosts, list) {
1115 if (dev->dev->port == pb) {
1116 list_del_init(&dev->list);
1117 scsi_remove_host(dev->host);
1118 scsi_host_put(dev->host);
1119 parport_unregister_device(dev->dev);
1126 static struct parport_driver ppa_driver = {
1128 .attach = ppa_attach,
1129 .detach = ppa_detach,
1132 static int __init ppa_driver_init(void)
1134 printk(KERN_INFO "ppa: Version %s\n", PPA_VERSION);
1135 return parport_register_driver(&ppa_driver);
1138 static void __exit ppa_driver_exit(void)
1140 parport_unregister_driver(&ppa_driver);
1143 module_init(ppa_driver_init);
1144 module_exit(ppa_driver_exit);
1145 MODULE_LICENSE("GPL");