1/* -*- linux-c -*-
2 *  drivers/cdrom/viocd.c
3 *
4 *  iSeries Virtual CD Rom
5 *
6 *  Authors: Dave Boutcher <boutcher@us.ibm.com>
7 *           Ryan Arnold <ryanarn@us.ibm.com>
8 *           Colin Devilbiss <devilbis@us.ibm.com>
9 *           Stephen Rothwell
10 *
11 * (C) Copyright 2000-2004 IBM Corporation
12 *
13 * This program is free software;  you can redistribute it and/or
14 * modify it under the terms of the GNU General Public License as
15 * published by the Free Software Foundation; either version 2 of the
16 * License, or (at your option) anyu later version.
17 *
18 * This program is distributed in the hope that it will be useful, but
19 * WITHOUT ANY WARRANTY; without even the implied warranty of
20 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
21 * General Public License for more details.
22 *
23 * You should have received a copy of the GNU General Public License
24 * along with this program; if not, write to the Free Software Foundation,
25 * Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
26 *
27 * This routine provides access to CD ROM drives owned and managed by an
28 * OS/400 partition running on the same box as this Linux partition.
29 *
30 * All operations are performed by sending messages back and forth to
31 * the OS/400 partition.
32 */
33
34#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
35
36#include <linux/major.h>
37#include <linux/blkdev.h>
38#include <linux/cdrom.h>
39#include <linux/errno.h>
40#include <linux/init.h>
41#include <linux/dma-mapping.h>
42#include <linux/module.h>
43#include <linux/completion.h>
44#include <linux/proc_fs.h>
45#include <linux/mutex.h>
46#include <linux/seq_file.h>
47#include <linux/scatterlist.h>
48
49#include <asm/vio.h>
50#include <asm/iseries/hv_types.h>
51#include <asm/iseries/hv_lp_event.h>
52#include <asm/iseries/vio.h>
53#include <asm/firmware.h>
54
55#define VIOCD_DEVICE			"iseries/vcd"
56
57#define VIOCD_VERS "1.06"
58
59/*
60 * Should probably make this a module parameter....sigh
61 */
62#define VIOCD_MAX_CD	HVMAXARCHITECTEDVIRTUALCDROMS
63
64static DEFINE_MUTEX(viocd_mutex);
65static const struct vio_error_entry viocd_err_table[] = {
66	{0x0201, EINVAL, "Invalid Range"},
67	{0x0202, EINVAL, "Invalid Token"},
68	{0x0203, EIO, "DMA Error"},
69	{0x0204, EIO, "Use Error"},
70	{0x0205, EIO, "Release Error"},
71	{0x0206, EINVAL, "Invalid CD"},
72	{0x020C, EROFS, "Read Only Device"},
73	{0x020D, ENOMEDIUM, "Changed or Missing Volume (or Varied Off?)"},
74	{0x020E, EIO, "Optical System Error (Varied Off?)"},
75	{0x02FF, EIO, "Internal Error"},
76	{0x3010, EIO, "Changed Volume"},
77	{0xC100, EIO, "Optical System Error"},
78	{0x0000, 0, NULL},
79};
80
81/*
82 * This is the structure we use to exchange info between driver and interrupt
83 * handler
84 */
85struct viocd_waitevent {
86	struct completion	com;
87	int			rc;
88	u16			sub_result;
89	int			changed;
90};
91
92/* this is a lookup table for the true capabilities of a device */
93struct capability_entry {
94	char	*type;
95	int	capability;
96};
97
98static struct capability_entry capability_table[] __initdata = {
99	{ "6330", CDC_LOCK | CDC_DVD_RAM | CDC_RAM },
100	{ "6331", CDC_LOCK | CDC_DVD_RAM | CDC_RAM },
101	{ "6333", CDC_LOCK | CDC_DVD_RAM | CDC_RAM },
102	{ "632A", CDC_LOCK | CDC_DVD_RAM | CDC_RAM },
103	{ "6321", CDC_LOCK },
104	{ "632B", 0 },
105	{ NULL  , CDC_LOCK },
106};
107
108/* These are our internal structures for keeping track of devices */
109static int viocd_numdev;
110
111struct disk_info {
112	struct gendisk			*viocd_disk;
113	struct cdrom_device_info	viocd_info;
114	struct device			*dev;
115	const char			*rsrcname;
116	const char			*type;
117	const char			*model;
118};
119static struct disk_info viocd_diskinfo[VIOCD_MAX_CD];
120
121#define DEVICE_NR(di)	((di) - &viocd_diskinfo[0])
122
123static spinlock_t viocd_reqlock;
124
125#define MAX_CD_REQ	1
126
127/* procfs support */
128static int proc_viocd_show(struct seq_file *m, void *v)
129{
130	int i;
131
132	for (i = 0; i < viocd_numdev; i++) {
133		seq_printf(m, "viocd device %d is iSeries resource %10.10s"
134				"type %4.4s, model %3.3s\n",
135				i, viocd_diskinfo[i].rsrcname,
136				viocd_diskinfo[i].type,
137				viocd_diskinfo[i].model);
138	}
139	return 0;
140}
141
142static int proc_viocd_open(struct inode *inode, struct file *file)
143{
144	return single_open(file, proc_viocd_show, NULL);
145}
146
147static const struct file_operations proc_viocd_operations = {
148	.owner		= THIS_MODULE,
149	.open		= proc_viocd_open,
150	.read		= seq_read,
151	.llseek		= seq_lseek,
152	.release	= single_release,
153};
154
155static int viocd_blk_open(struct block_device *bdev, fmode_t mode)
156{
157	struct disk_info *di = bdev->bd_disk->private_data;
158	int ret;
159
160	mutex_lock(&viocd_mutex);
161	ret = cdrom_open(&di->viocd_info, bdev, mode);
162	mutex_unlock(&viocd_mutex);
163
164	return ret;
165}
166
167static int viocd_blk_release(struct gendisk *disk, fmode_t mode)
168{
169	struct disk_info *di = disk->private_data;
170	mutex_lock(&viocd_mutex);
171	cdrom_release(&di->viocd_info, mode);
172	mutex_unlock(&viocd_mutex);
173	return 0;
174}
175
176static int viocd_blk_ioctl(struct block_device *bdev, fmode_t mode,
177		unsigned cmd, unsigned long arg)
178{
179	struct disk_info *di = bdev->bd_disk->private_data;
180	int ret;
181
182	mutex_lock(&viocd_mutex);
183	ret = cdrom_ioctl(&di->viocd_info, bdev, mode, cmd, arg);
184	mutex_unlock(&viocd_mutex);
185
186	return ret;
187}
188
189static unsigned int viocd_blk_check_events(struct gendisk *disk,
190					   unsigned int clearing)
191{
192	struct disk_info *di = disk->private_data;
193	return cdrom_check_events(&di->viocd_info, clearing);
194}
195
196static const struct block_device_operations viocd_fops = {
197	.owner =		THIS_MODULE,
198	.open =			viocd_blk_open,
199	.release =		viocd_blk_release,
200	.ioctl =		viocd_blk_ioctl,
201	.check_events =		viocd_blk_check_events,
202};
203
204static int viocd_open(struct cdrom_device_info *cdi, int purpose)
205{
206        struct disk_info *diskinfo = cdi->handle;
207	int device_no = DEVICE_NR(diskinfo);
208	HvLpEvent_Rc hvrc;
209	struct viocd_waitevent we;
210
211	init_completion(&we.com);
212	hvrc = HvCallEvent_signalLpEventFast(viopath_hostLp,
213			HvLpEvent_Type_VirtualIo,
214			viomajorsubtype_cdio | viocdopen,
215			HvLpEvent_AckInd_DoAck, HvLpEvent_AckType_ImmediateAck,
216			viopath_sourceinst(viopath_hostLp),
217			viopath_targetinst(viopath_hostLp),
218			(u64)&we, VIOVERSION << 16, ((u64)device_no << 48),
219			0, 0, 0);
220	if (hvrc != 0) {
221		pr_warning("bad rc on HvCallEvent_signalLpEventFast %d\n",
222			   (int)hvrc);
223		return -EIO;
224	}
225
226	wait_for_completion(&we.com);
227
228	if (we.rc) {
229		const struct vio_error_entry *err =
230			vio_lookup_rc(viocd_err_table, we.sub_result);
231		pr_warning("bad rc %d:0x%04X on open: %s\n",
232			   we.rc, we.sub_result, err->msg);
233		return -err->errno;
234	}
235
236	return 0;
237}
238
239static void viocd_release(struct cdrom_device_info *cdi)
240{
241	int device_no = DEVICE_NR((struct disk_info *)cdi->handle);
242	HvLpEvent_Rc hvrc;
243
244	hvrc = HvCallEvent_signalLpEventFast(viopath_hostLp,
245			HvLpEvent_Type_VirtualIo,
246			viomajorsubtype_cdio | viocdclose,
247			HvLpEvent_AckInd_NoAck, HvLpEvent_AckType_ImmediateAck,
248			viopath_sourceinst(viopath_hostLp),
249			viopath_targetinst(viopath_hostLp), 0,
250			VIOVERSION << 16, ((u64)device_no << 48), 0, 0, 0);
251	if (hvrc != 0)
252		pr_warning("bad rc on HvCallEvent_signalLpEventFast %d\n",
253			   (int)hvrc);
254}
255
256/* Send a read or write request to OS/400 */
257static int send_request(struct request *req)
258{
259	HvLpEvent_Rc hvrc;
260	struct disk_info *diskinfo = req->rq_disk->private_data;
261	u64 len;
262	dma_addr_t dmaaddr;
263	int direction;
264	u16 cmd;
265	struct scatterlist sg;
266
267	BUG_ON(req->nr_phys_segments > 1);
268
269	if (rq_data_dir(req) == READ) {
270		direction = DMA_FROM_DEVICE;
271		cmd = viomajorsubtype_cdio | viocdread;
272	} else {
273		direction = DMA_TO_DEVICE;
274		cmd = viomajorsubtype_cdio | viocdwrite;
275	}
276
277	sg_init_table(&sg, 1);
278        if (blk_rq_map_sg(req->q, req, &sg) == 0) {
279		pr_warning("error setting up scatter/gather list\n");
280		return -1;
281	}
282
283	if (dma_map_sg(diskinfo->dev, &sg, 1, direction) == 0) {
284		pr_warning("error allocating sg tce\n");
285		return -1;
286	}
287	dmaaddr = sg_dma_address(&sg);
288	len = sg_dma_len(&sg);
289
290	hvrc = HvCallEvent_signalLpEventFast(viopath_hostLp,
291			HvLpEvent_Type_VirtualIo, cmd,
292			HvLpEvent_AckInd_DoAck,
293			HvLpEvent_AckType_ImmediateAck,
294			viopath_sourceinst(viopath_hostLp),
295			viopath_targetinst(viopath_hostLp),
296			(u64)req, VIOVERSION << 16,
297			((u64)DEVICE_NR(diskinfo) << 48) | dmaaddr,
298			(u64)blk_rq_pos(req) * 512, len, 0);
299	if (hvrc != HvLpEvent_Rc_Good) {
300		pr_warning("hv error on op %d\n", (int)hvrc);
301		return -1;
302	}
303
304	return 0;
305}
306
307static int rwreq;
308
309static void do_viocd_request(struct request_queue *q)
310{
311	struct request *req;
312
313	while ((rwreq == 0) && ((req = blk_fetch_request(q)) != NULL)) {
314		if (req->cmd_type != REQ_TYPE_FS)
315			__blk_end_request_all(req, -EIO);
316		else if (send_request(req) < 0) {
317			pr_warning("unable to send message to OS/400!\n");
318			__blk_end_request_all(req, -EIO);
319		} else
320			rwreq++;
321	}
322}
323
324static unsigned int viocd_check_events(struct cdrom_device_info *cdi,
325				       unsigned int clearing, int disc_nr)
326{
327	struct viocd_waitevent we;
328	HvLpEvent_Rc hvrc;
329	int device_no = DEVICE_NR((struct disk_info *)cdi->handle);
330
331	init_completion(&we.com);
332
333	/* Send the open event to OS/400 */
334	hvrc = HvCallEvent_signalLpEventFast(viopath_hostLp,
335			HvLpEvent_Type_VirtualIo,
336			viomajorsubtype_cdio | viocdcheck,
337			HvLpEvent_AckInd_DoAck, HvLpEvent_AckType_ImmediateAck,
338			viopath_sourceinst(viopath_hostLp),
339			viopath_targetinst(viopath_hostLp),
340			(u64)&we, VIOVERSION << 16, ((u64)device_no << 48),
341			0, 0, 0);
342	if (hvrc != 0) {
343		pr_warning("bad rc on HvCallEvent_signalLpEventFast %d\n",
344			   (int)hvrc);
345		return 0;
346	}
347
348	wait_for_completion(&we.com);
349
350	/* Check the return code.  If bad, assume no change */
351	if (we.rc) {
352		const struct vio_error_entry *err =
353			vio_lookup_rc(viocd_err_table, we.sub_result);
354		pr_warning("bad rc %d:0x%04X on check_change: %s; Assuming no change\n",
355			   we.rc, we.sub_result, err->msg);
356		return 0;
357	}
358
359	return we.changed ? DISK_EVENT_MEDIA_CHANGE : 0;
360}
361
362static int viocd_lock_door(struct cdrom_device_info *cdi, int locking)
363{
364	HvLpEvent_Rc hvrc;
365	u64 device_no = DEVICE_NR((struct disk_info *)cdi->handle);
366	/* NOTE: flags is 1 or 0 so it won't overwrite the device_no */
367	u64 flags = !!locking;
368	struct viocd_waitevent we;
369
370	init_completion(&we.com);
371
372	/* Send the lockdoor event to OS/400 */
373	hvrc = HvCallEvent_signalLpEventFast(viopath_hostLp,
374			HvLpEvent_Type_VirtualIo,
375			viomajorsubtype_cdio | viocdlockdoor,
376			HvLpEvent_AckInd_DoAck, HvLpEvent_AckType_ImmediateAck,
377			viopath_sourceinst(viopath_hostLp),
378			viopath_targetinst(viopath_hostLp),
379			(u64)&we, VIOVERSION << 16,
380			(device_no << 48) | (flags << 32), 0, 0, 0);
381	if (hvrc != 0) {
382		pr_warning("bad rc on HvCallEvent_signalLpEventFast %d\n",
383			   (int)hvrc);
384		return -EIO;
385	}
386
387	wait_for_completion(&we.com);
388
389	if (we.rc != 0)
390		return -EIO;
391	return 0;
392}
393
394static int viocd_packet(struct cdrom_device_info *cdi,
395		struct packet_command *cgc)
396{
397	unsigned int buflen = cgc->buflen;
398	int ret = -EIO;
399
400	switch (cgc->cmd[0]) {
401	case GPCMD_READ_DISC_INFO:
402		{
403			disc_information *di = (disc_information *)cgc->buffer;
404
405			if (buflen >= 2) {
406				di->disc_information_length = cpu_to_be16(1);
407				ret = 0;
408			}
409			if (buflen >= 3)
410				di->erasable =
411					(cdi->ops->capability & ~cdi->mask
412					 & (CDC_DVD_RAM | CDC_RAM)) != 0;
413		}
414		break;
415	case GPCMD_GET_CONFIGURATION:
416		if (cgc->cmd[3] == CDF_RWRT) {
417			struct rwrt_feature_desc *rfd = (struct rwrt_feature_desc *)(cgc->buffer + sizeof(struct feature_header));
418
419			if ((buflen >=
420			     (sizeof(struct feature_header) + sizeof(*rfd))) &&
421			    (cdi->ops->capability & ~cdi->mask
422			     & (CDC_DVD_RAM | CDC_RAM))) {
423				rfd->feature_code = cpu_to_be16(CDF_RWRT);
424				rfd->curr = 1;
425				ret = 0;
426			}
427		}
428		break;
429	default:
430		if (cgc->sense) {
431			/* indicate Unknown code */
432			cgc->sense->sense_key = 0x05;
433			cgc->sense->asc = 0x20;
434			cgc->sense->ascq = 0x00;
435		}
436		break;
437	}
438
439	cgc->stat = ret;
440	return ret;
441}
442
443static void restart_all_queues(int first_index)
444{
445	int i;
446
447	for (i = first_index + 1; i < viocd_numdev; i++)
448		if (viocd_diskinfo[i].viocd_disk)
449			blk_run_queue(viocd_diskinfo[i].viocd_disk->queue);
450	for (i = 0; i <= first_index; i++)
451		if (viocd_diskinfo[i].viocd_disk)
452			blk_run_queue(viocd_diskinfo[i].viocd_disk->queue);
453}
454
455/* This routine handles incoming CD LP events */
456static void vio_handle_cd_event(struct HvLpEvent *event)
457{
458	struct viocdlpevent *bevent;
459	struct viocd_waitevent *pwe;
460	struct disk_info *di;
461	unsigned long flags;
462	struct request *req;
463
464
465	if (event == NULL)
466		/* Notification that a partition went away! */
467		return;
468	/* First, we should NEVER get an int here...only acks */
469	if (hvlpevent_is_int(event)) {
470		pr_warning("Yikes! got an int in viocd event handler!\n");
471		if (hvlpevent_need_ack(event)) {
472			event->xRc = HvLpEvent_Rc_InvalidSubtype;
473			HvCallEvent_ackLpEvent(event);
474		}
475	}
476
477	bevent = (struct viocdlpevent *)event;
478
479	switch (event->xSubtype & VIOMINOR_SUBTYPE_MASK) {
480	case viocdopen:
481		if (event->xRc == 0) {
482			di = &viocd_diskinfo[bevent->disk];
483			blk_queue_logical_block_size(di->viocd_disk->queue,
484						     bevent->block_size);
485			set_capacity(di->viocd_disk,
486					bevent->media_size *
487					bevent->block_size / 512);
488		}
489		/* FALLTHROUGH !! */
490	case viocdlockdoor:
491		pwe = (struct viocd_waitevent *)event->xCorrelationToken;
492return_complete:
493		pwe->rc = event->xRc;
494		pwe->sub_result = bevent->sub_result;
495		complete(&pwe->com);
496		break;
497
498	case viocdcheck:
499		pwe = (struct viocd_waitevent *)event->xCorrelationToken;
500		pwe->changed = bevent->flags;
501		goto return_complete;
502
503	case viocdclose:
504		break;
505
506	case viocdwrite:
507	case viocdread:
508		/*
509		 * Since this is running in interrupt mode, we need to
510		 * make sure we're not stepping on any global I/O operations
511		 */
512		di = &viocd_diskinfo[bevent->disk];
513		spin_lock_irqsave(&viocd_reqlock, flags);
514		dma_unmap_single(di->dev, bevent->token, bevent->len,
515				((event->xSubtype & VIOMINOR_SUBTYPE_MASK) == viocdread)
516				?  DMA_FROM_DEVICE : DMA_TO_DEVICE);
517		req = (struct request *)bevent->event.xCorrelationToken;
518		rwreq--;
519
520		if (event->xRc != HvLpEvent_Rc_Good) {
521			const struct vio_error_entry *err =
522				vio_lookup_rc(viocd_err_table,
523						bevent->sub_result);
524			pr_warning("request %p failed with rc %d:0x%04X: %s\n",
525				   req, event->xRc,
526				   bevent->sub_result, err->msg);
527			__blk_end_request_all(req, -EIO);
528		} else
529			__blk_end_request_all(req, 0);
530
531		/* restart handling of incoming requests */
532		spin_unlock_irqrestore(&viocd_reqlock, flags);
533		restart_all_queues(bevent->disk);
534		break;
535
536	default:
537		pr_warning("message with invalid subtype %0x04X!\n",
538			   event->xSubtype & VIOMINOR_SUBTYPE_MASK);
539		if (hvlpevent_need_ack(event)) {
540			event->xRc = HvLpEvent_Rc_InvalidSubtype;
541			HvCallEvent_ackLpEvent(event);
542		}
543	}
544}
545
546static int viocd_audio_ioctl(struct cdrom_device_info *cdi, unsigned int cmd,
547			     void *arg)
548{
549	return -EINVAL;
550}
551
552static struct cdrom_device_ops viocd_dops = {
553	.open = viocd_open,
554	.release = viocd_release,
555	.check_events = viocd_check_events,
556	.lock_door = viocd_lock_door,
557	.generic_packet = viocd_packet,
558	.audio_ioctl = viocd_audio_ioctl,
559	.capability = CDC_CLOSE_TRAY | CDC_OPEN_TRAY | CDC_LOCK | CDC_SELECT_SPEED | CDC_SELECT_DISC | CDC_MULTI_SESSION | CDC_MCN | CDC_MEDIA_CHANGED | CDC_PLAY_AUDIO | CDC_RESET | CDC_DRIVE_STATUS | CDC_GENERIC_PACKET | CDC_CD_R | CDC_CD_RW | CDC_DVD | CDC_DVD_R | CDC_DVD_RAM | CDC_RAM
560};
561
562static int find_capability(const char *type)
563{
564	struct capability_entry *entry;
565
566	for(entry = capability_table; entry->type; ++entry)
567		if(!strncmp(entry->type, type, 4))
568			break;
569	return entry->capability;
570}
571
572static int viocd_probe(struct vio_dev *vdev, const struct vio_device_id *id)
573{
574	struct gendisk *gendisk;
575	int deviceno;
576	struct disk_info *d;
577	struct cdrom_device_info *c;
578	struct request_queue *q;
579	struct device_node *node = vdev->dev.of_node;
580
581	deviceno = vdev->unit_address;
582	if (deviceno >= VIOCD_MAX_CD)
583		return -ENODEV;
584	if (!node)
585		return -ENODEV;
586
587	if (deviceno >= viocd_numdev)
588		viocd_numdev = deviceno + 1;
589
590	d = &viocd_diskinfo[deviceno];
591	d->rsrcname = of_get_property(node, "linux,vio_rsrcname", NULL);
592	d->type = of_get_property(node, "linux,vio_type", NULL);
593	d->model = of_get_property(node, "linux,vio_model", NULL);
594
595	c = &d->viocd_info;
596
597	c->ops = &viocd_dops;
598	c->speed = 4;
599	c->capacity = 1;
600	c->handle = d;
601	c->mask = ~find_capability(d->type);
602	sprintf(c->name, VIOCD_DEVICE "%c", 'a' + deviceno);
603
604	if (register_cdrom(c) != 0) {
605		pr_warning("Cannot register viocd CD-ROM %s!\n", c->name);
606		goto out;
607	}
608	pr_info("cd %s is iSeries resource %10.10s type %4.4s, model %3.3s\n",
609		c->name, d->rsrcname, d->type, d->model);
610	q = blk_init_queue(do_viocd_request, &viocd_reqlock);
611	if (q == NULL) {
612		pr_warning("Cannot allocate queue for %s!\n", c->name);
613		goto out_unregister_cdrom;
614	}
615	gendisk = alloc_disk(1);
616	if (gendisk == NULL) {
617		pr_warning("Cannot create gendisk for %s!\n", c->name);
618		goto out_cleanup_queue;
619	}
620	gendisk->major = VIOCD_MAJOR;
621	gendisk->first_minor = deviceno;
622	strncpy(gendisk->disk_name, c->name,
623			sizeof(gendisk->disk_name));
624	blk_queue_max_segments(q, 1);
625	blk_queue_max_hw_sectors(q, 4096 / 512);
626	gendisk->queue = q;
627	gendisk->fops = &viocd_fops;
628	gendisk->flags = GENHD_FL_CD | GENHD_FL_REMOVABLE |
629			 GENHD_FL_BLOCK_EVENTS_ON_EXCL_WRITE;
630	set_capacity(gendisk, 0);
631	gendisk->private_data = d;
632	d->viocd_disk = gendisk;
633	d->dev = &vdev->dev;
634	gendisk->driverfs_dev = d->dev;
635	add_disk(gendisk);
636	return 0;
637
638out_cleanup_queue:
639	blk_cleanup_queue(q);
640out_unregister_cdrom:
641	unregister_cdrom(c);
642out:
643	return -ENODEV;
644}
645
646static int viocd_remove(struct vio_dev *vdev)
647{
648	struct disk_info *d = &viocd_diskinfo[vdev->unit_address];
649
650	unregister_cdrom(&d->viocd_info);
651	del_gendisk(d->viocd_disk);
652	blk_cleanup_queue(d->viocd_disk->queue);
653	put_disk(d->viocd_disk);
654	return 0;
655}
656
657/**
658 * viocd_device_table: Used by vio.c to match devices that we
659 * support.
660 */
661static struct vio_device_id viocd_device_table[] __devinitdata = {
662	{ "block", "IBM,iSeries-viocd" },
663	{ "", "" }
664};
665MODULE_DEVICE_TABLE(vio, viocd_device_table);
666
667static struct vio_driver viocd_driver = {
668	.id_table = viocd_device_table,
669	.probe = viocd_probe,
670	.remove = viocd_remove,
671	.driver = {
672		.name = "viocd",
673		.owner = THIS_MODULE,
674	}
675};
676
677static int __init viocd_init(void)
678{
679	int ret = 0;
680
681	if (!firmware_has_feature(FW_FEATURE_ISERIES))
682		return -ENODEV;
683
684	if (viopath_hostLp == HvLpIndexInvalid) {
685		vio_set_hostlp();
686		/* If we don't have a host, bail out */
687		if (viopath_hostLp == HvLpIndexInvalid)
688			return -ENODEV;
689	}
690
691	pr_info("vers " VIOCD_VERS ", hosting partition %d\n", viopath_hostLp);
692
693	if (register_blkdev(VIOCD_MAJOR, VIOCD_DEVICE) != 0) {
694		pr_warning("Unable to get major %d for %s\n",
695			   VIOCD_MAJOR, VIOCD_DEVICE);
696		return -EIO;
697	}
698
699	ret = viopath_open(viopath_hostLp, viomajorsubtype_cdio,
700			MAX_CD_REQ + 2);
701	if (ret) {
702		pr_warning("error opening path to host partition %d\n",
703			   viopath_hostLp);
704		goto out_unregister;
705	}
706
707	/* Initialize our request handler */
708	vio_setHandler(viomajorsubtype_cdio, vio_handle_cd_event);
709
710	spin_lock_init(&viocd_reqlock);
711
712	ret = vio_register_driver(&viocd_driver);
713	if (ret)
714		goto out_free_info;
715
716	proc_create("iSeries/viocd", S_IFREG|S_IRUGO, NULL,
717		    &proc_viocd_operations);
718	return 0;
719
720out_free_info:
721	vio_clearHandler(viomajorsubtype_cdio);
722	viopath_close(viopath_hostLp, viomajorsubtype_cdio, MAX_CD_REQ + 2);
723out_unregister:
724	unregister_blkdev(VIOCD_MAJOR, VIOCD_DEVICE);
725	return ret;
726}
727
728static void __exit viocd_exit(void)
729{
730	remove_proc_entry("iSeries/viocd", NULL);
731	vio_unregister_driver(&viocd_driver);
732	viopath_close(viopath_hostLp, viomajorsubtype_cdio, MAX_CD_REQ + 2);
733	vio_clearHandler(viomajorsubtype_cdio);
734	unregister_blkdev(VIOCD_MAJOR, VIOCD_DEVICE);
735}
736
737module_init(viocd_init);
738module_exit(viocd_exit);
739MODULE_LICENSE("GPL");
740