1/*
2 * SCSI Media Changer device driver for Linux 2.6
3 *
4 *     (c) 1996-2003 Gerd Knorr <kraxel@bytesex.org>
5 *
6 */
7
8#define VERSION "0.25"
9
10#include <linux/module.h>
11#include <linux/init.h>
12#include <linux/fs.h>
13#include <linux/kernel.h>
14#include <linux/mm.h>
15#include <linux/major.h>
16#include <linux/string.h>
17#include <linux/errno.h>
18#include <linux/interrupt.h>
19#include <linux/blkdev.h>
20#include <linux/completion.h>
21#include <linux/compat.h>
22#include <linux/chio.h>			/* here are all the ioctls */
23#include <linux/mutex.h>
24#include <linux/idr.h>
25#include <linux/slab.h>
26
27#include <scsi/scsi.h>
28#include <scsi/scsi_cmnd.h>
29#include <scsi/scsi_driver.h>
30#include <scsi/scsi_ioctl.h>
31#include <scsi/scsi_host.h>
32#include <scsi/scsi_device.h>
33#include <scsi/scsi_eh.h>
34#include <scsi/scsi_dbg.h>
35
36#define CH_DT_MAX       16
37#define CH_TYPES        8
38#define CH_MAX_DEVS     128
39
40MODULE_DESCRIPTION("device driver for scsi media changer devices");
41MODULE_AUTHOR("Gerd Knorr <kraxel@bytesex.org>");
42MODULE_LICENSE("GPL");
43MODULE_ALIAS_CHARDEV_MAJOR(SCSI_CHANGER_MAJOR);
44MODULE_ALIAS_SCSI_DEVICE(TYPE_MEDIUM_CHANGER);
45
46static DEFINE_MUTEX(ch_mutex);
47static int init = 1;
48module_param(init, int, 0444);
49MODULE_PARM_DESC(init, \
50    "initialize element status on driver load (default: on)");
51
52static int timeout_move = 300;
53module_param(timeout_move, int, 0644);
54MODULE_PARM_DESC(timeout_move,"timeout for move commands "
55		 "(default: 300 seconds)");
56
57static int timeout_init = 3600;
58module_param(timeout_init, int, 0644);
59MODULE_PARM_DESC(timeout_init,"timeout for INITIALIZE ELEMENT STATUS "
60		 "(default: 3600 seconds)");
61
62static int verbose = 1;
63module_param(verbose, int, 0644);
64MODULE_PARM_DESC(verbose,"be verbose (default: on)");
65
66static int debug = 0;
67module_param(debug, int, 0644);
68MODULE_PARM_DESC(debug,"enable/disable debug messages, also prints more "
69		 "detailed sense codes on scsi errors (default: off)");
70
71static int dt_id[CH_DT_MAX] = { [ 0 ... (CH_DT_MAX-1) ] = -1 };
72static int dt_lun[CH_DT_MAX];
73module_param_array(dt_id,  int, NULL, 0444);
74module_param_array(dt_lun, int, NULL, 0444);
75
76/* tell the driver about vendor-specific slots */
77static int vendor_firsts[CH_TYPES-4];
78static int vendor_counts[CH_TYPES-4];
79module_param_array(vendor_firsts, int, NULL, 0444);
80module_param_array(vendor_counts, int, NULL, 0444);
81
82static const char * vendor_labels[CH_TYPES-4] = {
83	"v0", "v1", "v2", "v3"
84};
85// module_param_string_array(vendor_labels, NULL, 0444);
86
87#define ch_printk(prefix, ch, fmt, a...) \
88	sdev_prefix_printk(prefix, (ch)->device, (ch)->name, fmt, ##a)
89
90#define DPRINTK(fmt, arg...)						\
91do {									\
92	if (debug)							\
93		ch_printk(KERN_DEBUG, ch, fmt, ##arg);			\
94} while (0)
95#define VPRINTK(level, fmt, arg...)					\
96do {									\
97	if (verbose)							\
98		ch_printk(level, ch, fmt, ##arg);			\
99} while (0)
100
101/* ------------------------------------------------------------------- */
102
103#define MAX_RETRIES   1
104
105static struct class * ch_sysfs_class;
106
107typedef struct {
108	struct list_head    list;
109	int                 minor;
110	char                name[8];
111	struct scsi_device  *device;
112	struct scsi_device  **dt;        /* ptrs to data transfer elements */
113	u_int               firsts[CH_TYPES];
114	u_int               counts[CH_TYPES];
115	u_int               unit_attention;
116	u_int		    voltags;
117	struct mutex	    lock;
118} scsi_changer;
119
120static DEFINE_IDR(ch_index_idr);
121static DEFINE_SPINLOCK(ch_index_lock);
122
123static const struct {
124	unsigned char  sense;
125	unsigned char  asc;
126	unsigned char  ascq;
127	int	       errno;
128} ch_err[] = {
129/* Just filled in what looks right. Hav'nt checked any standard paper for
130   these errno assignments, so they may be wrong... */
131	{
132		.sense  = ILLEGAL_REQUEST,
133		.asc    = 0x21,
134		.ascq   = 0x01,
135		.errno  = EBADSLT, /* Invalid element address */
136	},{
137		.sense  = ILLEGAL_REQUEST,
138		.asc    = 0x28,
139		.ascq   = 0x01,
140		.errno  = EBADE,   /* Import or export element accessed */
141	},{
142		.sense  = ILLEGAL_REQUEST,
143		.asc    = 0x3B,
144		.ascq   = 0x0D,
145		.errno  = EXFULL,  /* Medium destination element full */
146	},{
147		.sense  = ILLEGAL_REQUEST,
148		.asc    = 0x3B,
149		.ascq   = 0x0E,
150		.errno  = EBADE,   /* Medium source element empty */
151	},{
152		.sense  = ILLEGAL_REQUEST,
153		.asc    = 0x20,
154		.ascq   = 0x00,
155		.errno  = EBADRQC, /* Invalid command operation code */
156	},{
157	        /* end of list */
158	}
159};
160
161/* ------------------------------------------------------------------- */
162
163static int ch_find_errno(struct scsi_sense_hdr *sshdr)
164{
165	int i,errno = 0;
166
167	/* Check to see if additional sense information is available */
168	if (scsi_sense_valid(sshdr) &&
169	    sshdr->asc != 0) {
170		for (i = 0; ch_err[i].errno != 0; i++) {
171			if (ch_err[i].sense == sshdr->sense_key &&
172			    ch_err[i].asc   == sshdr->asc &&
173			    ch_err[i].ascq  == sshdr->ascq) {
174				errno = -ch_err[i].errno;
175				break;
176			}
177		}
178	}
179	if (errno == 0)
180		errno = -EIO;
181	return errno;
182}
183
184static int
185ch_do_scsi(scsi_changer *ch, unsigned char *cmd, int cmd_len,
186	   void *buffer, unsigned buflength,
187	   enum dma_data_direction direction)
188{
189	int errno, retries = 0, timeout, result;
190	struct scsi_sense_hdr sshdr;
191
192	timeout = (cmd[0] == INITIALIZE_ELEMENT_STATUS)
193		? timeout_init : timeout_move;
194
195 retry:
196	errno = 0;
197	result = scsi_execute_req(ch->device, cmd, direction, buffer,
198				  buflength, &sshdr, timeout * HZ,
199				  MAX_RETRIES, NULL);
200
201	if (driver_byte(result) & DRIVER_SENSE) {
202		if (debug)
203			scsi_print_sense_hdr(ch->device, ch->name, &sshdr);
204		errno = ch_find_errno(&sshdr);
205
206		switch(sshdr.sense_key) {
207		case UNIT_ATTENTION:
208			ch->unit_attention = 1;
209			if (retries++ < 3)
210				goto retry;
211			break;
212		}
213	}
214	return errno;
215}
216
217/* ------------------------------------------------------------------------ */
218
219static int
220ch_elem_to_typecode(scsi_changer *ch, u_int elem)
221{
222	int i;
223
224	for (i = 0; i < CH_TYPES; i++) {
225		if (elem >= ch->firsts[i]  &&
226		    elem <  ch->firsts[i] +
227	            ch->counts[i])
228			return i+1;
229	}
230	return 0;
231}
232
233static int
234ch_read_element_status(scsi_changer *ch, u_int elem, char *data)
235{
236	u_char  cmd[12];
237	u_char  *buffer;
238	int     result;
239
240	buffer = kmalloc(512, GFP_KERNEL | GFP_DMA);
241	if(!buffer)
242		return -ENOMEM;
243
244 retry:
245	memset(cmd,0,sizeof(cmd));
246	cmd[0] = READ_ELEMENT_STATUS;
247	cmd[1] = ((ch->device->lun & 0x7) << 5) |
248		(ch->voltags ? 0x10 : 0) |
249		ch_elem_to_typecode(ch,elem);
250	cmd[2] = (elem >> 8) & 0xff;
251	cmd[3] = elem        & 0xff;
252	cmd[5] = 1;
253	cmd[9] = 255;
254	if (0 == (result = ch_do_scsi(ch, cmd, 12,
255				      buffer, 256, DMA_FROM_DEVICE))) {
256		if (((buffer[16] << 8) | buffer[17]) != elem) {
257			DPRINTK("asked for element 0x%02x, got 0x%02x\n",
258				elem,(buffer[16] << 8) | buffer[17]);
259			kfree(buffer);
260			return -EIO;
261		}
262		memcpy(data,buffer+16,16);
263	} else {
264		if (ch->voltags) {
265			ch->voltags = 0;
266			VPRINTK(KERN_INFO, "device has no volume tag support\n");
267			goto retry;
268		}
269		DPRINTK("READ ELEMENT STATUS for element 0x%x failed\n",elem);
270	}
271	kfree(buffer);
272	return result;
273}
274
275static int
276ch_init_elem(scsi_changer *ch)
277{
278	int err;
279	u_char cmd[6];
280
281	VPRINTK(KERN_INFO, "INITIALIZE ELEMENT STATUS, may take some time ...\n");
282	memset(cmd,0,sizeof(cmd));
283	cmd[0] = INITIALIZE_ELEMENT_STATUS;
284	cmd[1] = (ch->device->lun & 0x7) << 5;
285	err = ch_do_scsi(ch, cmd, 6, NULL, 0, DMA_NONE);
286	VPRINTK(KERN_INFO, "... finished\n");
287	return err;
288}
289
290static int
291ch_readconfig(scsi_changer *ch)
292{
293	u_char  cmd[10], data[16];
294	u_char  *buffer;
295	int     result,id,lun,i;
296	u_int   elem;
297
298	buffer = kzalloc(512, GFP_KERNEL | GFP_DMA);
299	if (!buffer)
300		return -ENOMEM;
301
302	memset(cmd,0,sizeof(cmd));
303	cmd[0] = MODE_SENSE;
304	cmd[1] = (ch->device->lun & 0x7) << 5;
305	cmd[2] = 0x1d;
306	cmd[4] = 255;
307	result = ch_do_scsi(ch, cmd, 10, buffer, 255, DMA_FROM_DEVICE);
308	if (0 != result) {
309		cmd[1] |= (1<<3);
310		result  = ch_do_scsi(ch, cmd, 10, buffer, 255, DMA_FROM_DEVICE);
311	}
312	if (0 == result) {
313		ch->firsts[CHET_MT] =
314			(buffer[buffer[3]+ 6] << 8) | buffer[buffer[3]+ 7];
315		ch->counts[CHET_MT] =
316			(buffer[buffer[3]+ 8] << 8) | buffer[buffer[3]+ 9];
317		ch->firsts[CHET_ST] =
318			(buffer[buffer[3]+10] << 8) | buffer[buffer[3]+11];
319		ch->counts[CHET_ST] =
320			(buffer[buffer[3]+12] << 8) | buffer[buffer[3]+13];
321		ch->firsts[CHET_IE] =
322			(buffer[buffer[3]+14] << 8) | buffer[buffer[3]+15];
323		ch->counts[CHET_IE] =
324			(buffer[buffer[3]+16] << 8) | buffer[buffer[3]+17];
325		ch->firsts[CHET_DT] =
326			(buffer[buffer[3]+18] << 8) | buffer[buffer[3]+19];
327		ch->counts[CHET_DT] =
328			(buffer[buffer[3]+20] << 8) | buffer[buffer[3]+21];
329		VPRINTK(KERN_INFO, "type #1 (mt): 0x%x+%d [medium transport]\n",
330			ch->firsts[CHET_MT],
331			ch->counts[CHET_MT]);
332		VPRINTK(KERN_INFO, "type #2 (st): 0x%x+%d [storage]\n",
333			ch->firsts[CHET_ST],
334			ch->counts[CHET_ST]);
335		VPRINTK(KERN_INFO, "type #3 (ie): 0x%x+%d [import/export]\n",
336			ch->firsts[CHET_IE],
337			ch->counts[CHET_IE]);
338		VPRINTK(KERN_INFO, "type #4 (dt): 0x%x+%d [data transfer]\n",
339			ch->firsts[CHET_DT],
340			ch->counts[CHET_DT]);
341	} else {
342		VPRINTK(KERN_INFO, "reading element address assignment page failed!\n");
343	}
344
345	/* vendor specific element types */
346	for (i = 0; i < 4; i++) {
347		if (0 == vendor_counts[i])
348			continue;
349		if (NULL == vendor_labels[i])
350			continue;
351		ch->firsts[CHET_V1+i] = vendor_firsts[i];
352		ch->counts[CHET_V1+i] = vendor_counts[i];
353		VPRINTK(KERN_INFO, "type #%d (v%d): 0x%x+%d [%s, vendor specific]\n",
354			i+5,i+1,vendor_firsts[i],vendor_counts[i],
355			vendor_labels[i]);
356	}
357
358	/* look up the devices of the data transfer elements */
359	ch->dt = kcalloc(ch->counts[CHET_DT], sizeof(*ch->dt),
360			 GFP_KERNEL);
361
362	if (!ch->dt) {
363		kfree(buffer);
364		return -ENOMEM;
365	}
366
367	for (elem = 0; elem < ch->counts[CHET_DT]; elem++) {
368		id  = -1;
369		lun = 0;
370		if (elem < CH_DT_MAX  &&  -1 != dt_id[elem]) {
371			id  = dt_id[elem];
372			lun = dt_lun[elem];
373			VPRINTK(KERN_INFO, "dt 0x%x: [insmod option] ",
374				elem+ch->firsts[CHET_DT]);
375		} else if (0 != ch_read_element_status
376			   (ch,elem+ch->firsts[CHET_DT],data)) {
377			VPRINTK(KERN_INFO, "dt 0x%x: READ ELEMENT STATUS failed\n",
378				elem+ch->firsts[CHET_DT]);
379		} else {
380			VPRINTK(KERN_INFO, "dt 0x%x: ",elem+ch->firsts[CHET_DT]);
381			if (data[6] & 0x80) {
382				VPRINTK(KERN_CONT, "not this SCSI bus\n");
383				ch->dt[elem] = NULL;
384			} else if (0 == (data[6] & 0x30)) {
385				VPRINTK(KERN_CONT, "ID/LUN unknown\n");
386				ch->dt[elem] = NULL;
387			} else {
388				id  = ch->device->id;
389				lun = 0;
390				if (data[6] & 0x20) id  = data[7];
391				if (data[6] & 0x10) lun = data[6] & 7;
392			}
393		}
394		if (-1 != id) {
395			VPRINTK(KERN_CONT, "ID %i, LUN %i, ",id,lun);
396			ch->dt[elem] =
397				scsi_device_lookup(ch->device->host,
398						   ch->device->channel,
399						   id,lun);
400			if (!ch->dt[elem]) {
401				/* should not happen */
402				VPRINTK(KERN_CONT, "Huh? device not found!\n");
403			} else {
404				VPRINTK(KERN_CONT, "name: %8.8s %16.16s %4.4s\n",
405					ch->dt[elem]->vendor,
406					ch->dt[elem]->model,
407					ch->dt[elem]->rev);
408			}
409		}
410	}
411	ch->voltags = 1;
412	kfree(buffer);
413
414	return 0;
415}
416
417/* ------------------------------------------------------------------------ */
418
419static int
420ch_position(scsi_changer *ch, u_int trans, u_int elem, int rotate)
421{
422	u_char  cmd[10];
423
424	DPRINTK("position: 0x%x\n",elem);
425	if (0 == trans)
426		trans = ch->firsts[CHET_MT];
427	memset(cmd,0,sizeof(cmd));
428	cmd[0]  = POSITION_TO_ELEMENT;
429	cmd[1]  = (ch->device->lun & 0x7) << 5;
430	cmd[2]  = (trans >> 8) & 0xff;
431	cmd[3]  =  trans       & 0xff;
432	cmd[4]  = (elem  >> 8) & 0xff;
433	cmd[5]  =  elem        & 0xff;
434	cmd[8]  = rotate ? 1 : 0;
435	return ch_do_scsi(ch, cmd, 10, NULL, 0, DMA_NONE);
436}
437
438static int
439ch_move(scsi_changer *ch, u_int trans, u_int src, u_int dest, int rotate)
440{
441	u_char  cmd[12];
442
443	DPRINTK("move: 0x%x => 0x%x\n",src,dest);
444	if (0 == trans)
445		trans = ch->firsts[CHET_MT];
446	memset(cmd,0,sizeof(cmd));
447	cmd[0]  = MOVE_MEDIUM;
448	cmd[1]  = (ch->device->lun & 0x7) << 5;
449	cmd[2]  = (trans >> 8) & 0xff;
450	cmd[3]  =  trans       & 0xff;
451	cmd[4]  = (src   >> 8) & 0xff;
452	cmd[5]  =  src         & 0xff;
453	cmd[6]  = (dest  >> 8) & 0xff;
454	cmd[7]  =  dest        & 0xff;
455	cmd[10] = rotate ? 1 : 0;
456	return ch_do_scsi(ch, cmd, 12, NULL,0, DMA_NONE);
457}
458
459static int
460ch_exchange(scsi_changer *ch, u_int trans, u_int src,
461	    u_int dest1, u_int dest2, int rotate1, int rotate2)
462{
463	u_char  cmd[12];
464
465	DPRINTK("exchange: 0x%x => 0x%x => 0x%x\n",
466		src,dest1,dest2);
467	if (0 == trans)
468		trans = ch->firsts[CHET_MT];
469	memset(cmd,0,sizeof(cmd));
470	cmd[0]  = EXCHANGE_MEDIUM;
471	cmd[1]  = (ch->device->lun & 0x7) << 5;
472	cmd[2]  = (trans >> 8) & 0xff;
473	cmd[3]  =  trans       & 0xff;
474	cmd[4]  = (src   >> 8) & 0xff;
475	cmd[5]  =  src         & 0xff;
476	cmd[6]  = (dest1 >> 8) & 0xff;
477	cmd[7]  =  dest1       & 0xff;
478	cmd[8]  = (dest2 >> 8) & 0xff;
479	cmd[9]  =  dest2       & 0xff;
480	cmd[10] = (rotate1 ? 1 : 0) | (rotate2 ? 2 : 0);
481
482	return ch_do_scsi(ch, cmd, 12, NULL, 0, DMA_NONE);
483}
484
485static void
486ch_check_voltag(char *tag)
487{
488	int i;
489
490	for (i = 0; i < 32; i++) {
491		/* restrict to ascii */
492		if (tag[i] >= 0x7f || tag[i] < 0x20)
493			tag[i] = ' ';
494		/* don't allow search wildcards */
495		if (tag[i] == '?' ||
496		    tag[i] == '*')
497			tag[i] = ' ';
498	}
499}
500
501static int
502ch_set_voltag(scsi_changer *ch, u_int elem,
503	      int alternate, int clear, u_char *tag)
504{
505	u_char  cmd[12];
506	u_char  *buffer;
507	int result;
508
509	buffer = kzalloc(512, GFP_KERNEL);
510	if (!buffer)
511		return -ENOMEM;
512
513	DPRINTK("%s %s voltag: 0x%x => \"%s\"\n",
514		clear     ? "clear"     : "set",
515		alternate ? "alternate" : "primary",
516		elem, tag);
517	memset(cmd,0,sizeof(cmd));
518	cmd[0]  = SEND_VOLUME_TAG;
519	cmd[1] = ((ch->device->lun & 0x7) << 5) |
520		ch_elem_to_typecode(ch,elem);
521	cmd[2] = (elem >> 8) & 0xff;
522	cmd[3] = elem        & 0xff;
523	cmd[5] = clear
524		? (alternate ? 0x0d : 0x0c)
525		: (alternate ? 0x0b : 0x0a);
526
527	cmd[9] = 255;
528
529	memcpy(buffer,tag,32);
530	ch_check_voltag(buffer);
531
532	result = ch_do_scsi(ch, cmd, 12, buffer, 256, DMA_TO_DEVICE);
533	kfree(buffer);
534	return result;
535}
536
537static int ch_gstatus(scsi_changer *ch, int type, unsigned char __user *dest)
538{
539	int retval = 0;
540	u_char data[16];
541	unsigned int i;
542
543	mutex_lock(&ch->lock);
544	for (i = 0; i < ch->counts[type]; i++) {
545		if (0 != ch_read_element_status
546		    (ch, ch->firsts[type]+i,data)) {
547			retval = -EIO;
548			break;
549		}
550		put_user(data[2], dest+i);
551		if (data[2] & CESTATUS_EXCEPT)
552			VPRINTK(KERN_INFO, "element 0x%x: asc=0x%x, ascq=0x%x\n",
553				ch->firsts[type]+i,
554				(int)data[4],(int)data[5]);
555		retval = ch_read_element_status
556			(ch, ch->firsts[type]+i,data);
557		if (0 != retval)
558			break;
559	}
560	mutex_unlock(&ch->lock);
561	return retval;
562}
563
564/* ------------------------------------------------------------------------ */
565
566static int
567ch_release(struct inode *inode, struct file *file)
568{
569	scsi_changer *ch = file->private_data;
570
571	scsi_device_put(ch->device);
572	file->private_data = NULL;
573	return 0;
574}
575
576static int
577ch_open(struct inode *inode, struct file *file)
578{
579	scsi_changer *ch;
580	int minor = iminor(inode);
581
582	mutex_lock(&ch_mutex);
583	spin_lock(&ch_index_lock);
584	ch = idr_find(&ch_index_idr, minor);
585
586	if (NULL == ch || scsi_device_get(ch->device)) {
587		spin_unlock(&ch_index_lock);
588		mutex_unlock(&ch_mutex);
589		return -ENXIO;
590	}
591	spin_unlock(&ch_index_lock);
592
593	file->private_data = ch;
594	mutex_unlock(&ch_mutex);
595	return 0;
596}
597
598static int
599ch_checkrange(scsi_changer *ch, unsigned int type, unsigned int unit)
600{
601	if (type >= CH_TYPES  ||  unit >= ch->counts[type])
602		return -1;
603	return 0;
604}
605
606static long ch_ioctl(struct file *file,
607		    unsigned int cmd, unsigned long arg)
608{
609	scsi_changer *ch = file->private_data;
610	int retval;
611	void __user *argp = (void __user *)arg;
612
613	retval = scsi_ioctl_block_when_processing_errors(ch->device, cmd,
614			file->f_flags & O_NDELAY);
615	if (retval)
616		return retval;
617
618	switch (cmd) {
619	case CHIOGPARAMS:
620	{
621		struct changer_params params;
622
623		params.cp_curpicker = 0;
624		params.cp_npickers  = ch->counts[CHET_MT];
625		params.cp_nslots    = ch->counts[CHET_ST];
626		params.cp_nportals  = ch->counts[CHET_IE];
627		params.cp_ndrives   = ch->counts[CHET_DT];
628
629		if (copy_to_user(argp, &params, sizeof(params)))
630			return -EFAULT;
631		return 0;
632	}
633	case CHIOGVPARAMS:
634	{
635		struct changer_vendor_params vparams;
636
637		memset(&vparams,0,sizeof(vparams));
638		if (ch->counts[CHET_V1]) {
639			vparams.cvp_n1  = ch->counts[CHET_V1];
640			strncpy(vparams.cvp_label1,vendor_labels[0],16);
641		}
642		if (ch->counts[CHET_V2]) {
643			vparams.cvp_n2  = ch->counts[CHET_V2];
644			strncpy(vparams.cvp_label2,vendor_labels[1],16);
645		}
646		if (ch->counts[CHET_V3]) {
647			vparams.cvp_n3  = ch->counts[CHET_V3];
648			strncpy(vparams.cvp_label3,vendor_labels[2],16);
649		}
650		if (ch->counts[CHET_V4]) {
651			vparams.cvp_n4  = ch->counts[CHET_V4];
652			strncpy(vparams.cvp_label4,vendor_labels[3],16);
653		}
654		if (copy_to_user(argp, &vparams, sizeof(vparams)))
655			return -EFAULT;
656		return 0;
657	}
658
659	case CHIOPOSITION:
660	{
661		struct changer_position pos;
662
663		if (copy_from_user(&pos, argp, sizeof (pos)))
664			return -EFAULT;
665
666		if (0 != ch_checkrange(ch, pos.cp_type, pos.cp_unit)) {
667			DPRINTK("CHIOPOSITION: invalid parameter\n");
668			return -EBADSLT;
669		}
670		mutex_lock(&ch->lock);
671		retval = ch_position(ch,0,
672				     ch->firsts[pos.cp_type] + pos.cp_unit,
673				     pos.cp_flags & CP_INVERT);
674		mutex_unlock(&ch->lock);
675		return retval;
676	}
677
678	case CHIOMOVE:
679	{
680		struct changer_move mv;
681
682		if (copy_from_user(&mv, argp, sizeof (mv)))
683			return -EFAULT;
684
685		if (0 != ch_checkrange(ch, mv.cm_fromtype, mv.cm_fromunit) ||
686		    0 != ch_checkrange(ch, mv.cm_totype,   mv.cm_tounit  )) {
687			DPRINTK("CHIOMOVE: invalid parameter\n");
688			return -EBADSLT;
689		}
690
691		mutex_lock(&ch->lock);
692		retval = ch_move(ch,0,
693				 ch->firsts[mv.cm_fromtype] + mv.cm_fromunit,
694				 ch->firsts[mv.cm_totype]   + mv.cm_tounit,
695				 mv.cm_flags & CM_INVERT);
696		mutex_unlock(&ch->lock);
697		return retval;
698	}
699
700	case CHIOEXCHANGE:
701	{
702		struct changer_exchange mv;
703
704		if (copy_from_user(&mv, argp, sizeof (mv)))
705			return -EFAULT;
706
707		if (0 != ch_checkrange(ch, mv.ce_srctype,  mv.ce_srcunit ) ||
708		    0 != ch_checkrange(ch, mv.ce_fdsttype, mv.ce_fdstunit) ||
709		    0 != ch_checkrange(ch, mv.ce_sdsttype, mv.ce_sdstunit)) {
710			DPRINTK("CHIOEXCHANGE: invalid parameter\n");
711			return -EBADSLT;
712		}
713
714		mutex_lock(&ch->lock);
715		retval = ch_exchange
716			(ch,0,
717			 ch->firsts[mv.ce_srctype]  + mv.ce_srcunit,
718			 ch->firsts[mv.ce_fdsttype] + mv.ce_fdstunit,
719			 ch->firsts[mv.ce_sdsttype] + mv.ce_sdstunit,
720			 mv.ce_flags & CE_INVERT1, mv.ce_flags & CE_INVERT2);
721		mutex_unlock(&ch->lock);
722		return retval;
723	}
724
725	case CHIOGSTATUS:
726	{
727		struct changer_element_status ces;
728
729		if (copy_from_user(&ces, argp, sizeof (ces)))
730			return -EFAULT;
731		if (ces.ces_type < 0 || ces.ces_type >= CH_TYPES)
732			return -EINVAL;
733
734		return ch_gstatus(ch, ces.ces_type, ces.ces_data);
735	}
736
737	case CHIOGELEM:
738	{
739		struct changer_get_element cge;
740		u_char ch_cmd[12];
741		u_char *buffer;
742		unsigned int elem;
743		int     result,i;
744
745		if (copy_from_user(&cge, argp, sizeof (cge)))
746			return -EFAULT;
747
748		if (0 != ch_checkrange(ch, cge.cge_type, cge.cge_unit))
749			return -EINVAL;
750		elem = ch->firsts[cge.cge_type] + cge.cge_unit;
751
752		buffer = kmalloc(512, GFP_KERNEL | GFP_DMA);
753		if (!buffer)
754			return -ENOMEM;
755		mutex_lock(&ch->lock);
756
757	voltag_retry:
758		memset(ch_cmd, 0, sizeof(ch_cmd));
759		ch_cmd[0] = READ_ELEMENT_STATUS;
760		ch_cmd[1] = ((ch->device->lun & 0x7) << 5) |
761			(ch->voltags ? 0x10 : 0) |
762			ch_elem_to_typecode(ch,elem);
763		ch_cmd[2] = (elem >> 8) & 0xff;
764		ch_cmd[3] = elem        & 0xff;
765		ch_cmd[5] = 1;
766		ch_cmd[9] = 255;
767
768		result = ch_do_scsi(ch, ch_cmd, 12,
769				    buffer, 256, DMA_FROM_DEVICE);
770		if (!result) {
771			cge.cge_status = buffer[18];
772			cge.cge_flags = 0;
773			if (buffer[18] & CESTATUS_EXCEPT) {
774				cge.cge_errno = EIO;
775			}
776			if (buffer[25] & 0x80) {
777				cge.cge_flags |= CGE_SRC;
778				if (buffer[25] & 0x40)
779					cge.cge_flags |= CGE_INVERT;
780				elem = (buffer[26]<<8) | buffer[27];
781				for (i = 0; i < 4; i++) {
782					if (elem >= ch->firsts[i] &&
783					    elem <  ch->firsts[i] + ch->counts[i]) {
784						cge.cge_srctype = i;
785						cge.cge_srcunit = elem-ch->firsts[i];
786					}
787				}
788			}
789			if ((buffer[22] & 0x30) == 0x30) {
790				cge.cge_flags |= CGE_IDLUN;
791				cge.cge_id  = buffer[23];
792				cge.cge_lun = buffer[22] & 7;
793			}
794			if (buffer[9] & 0x80) {
795				cge.cge_flags |= CGE_PVOLTAG;
796				memcpy(cge.cge_pvoltag,buffer+28,36);
797			}
798			if (buffer[9] & 0x40) {
799				cge.cge_flags |= CGE_AVOLTAG;
800				memcpy(cge.cge_avoltag,buffer+64,36);
801			}
802		} else if (ch->voltags) {
803			ch->voltags = 0;
804			VPRINTK(KERN_INFO, "device has no volume tag support\n");
805			goto voltag_retry;
806		}
807		kfree(buffer);
808		mutex_unlock(&ch->lock);
809
810		if (copy_to_user(argp, &cge, sizeof (cge)))
811			return -EFAULT;
812		return result;
813	}
814
815	case CHIOINITELEM:
816	{
817		mutex_lock(&ch->lock);
818		retval = ch_init_elem(ch);
819		mutex_unlock(&ch->lock);
820		return retval;
821	}
822
823	case CHIOSVOLTAG:
824	{
825		struct changer_set_voltag csv;
826		int elem;
827
828		if (copy_from_user(&csv, argp, sizeof(csv)))
829			return -EFAULT;
830
831		if (0 != ch_checkrange(ch, csv.csv_type, csv.csv_unit)) {
832			DPRINTK("CHIOSVOLTAG: invalid parameter\n");
833			return -EBADSLT;
834		}
835		elem = ch->firsts[csv.csv_type] + csv.csv_unit;
836		mutex_lock(&ch->lock);
837		retval = ch_set_voltag(ch, elem,
838				       csv.csv_flags & CSV_AVOLTAG,
839				       csv.csv_flags & CSV_CLEARTAG,
840				       csv.csv_voltag);
841		mutex_unlock(&ch->lock);
842		return retval;
843	}
844
845	default:
846		return scsi_ioctl(ch->device, cmd, argp);
847
848	}
849}
850
851#ifdef CONFIG_COMPAT
852
853struct changer_element_status32 {
854	int		ces_type;
855	compat_uptr_t	ces_data;
856};
857#define CHIOGSTATUS32  _IOW('c', 8,struct changer_element_status32)
858
859static long ch_ioctl_compat(struct file * file,
860			    unsigned int cmd, unsigned long arg)
861{
862	scsi_changer *ch = file->private_data;
863
864	switch (cmd) {
865	case CHIOGPARAMS:
866	case CHIOGVPARAMS:
867	case CHIOPOSITION:
868	case CHIOMOVE:
869	case CHIOEXCHANGE:
870	case CHIOGELEM:
871	case CHIOINITELEM:
872	case CHIOSVOLTAG:
873		/* compatible */
874		return ch_ioctl(file, cmd, arg);
875	case CHIOGSTATUS32:
876	{
877		struct changer_element_status32 ces32;
878		unsigned char __user *data;
879
880		if (copy_from_user(&ces32, (void __user *)arg, sizeof (ces32)))
881			return -EFAULT;
882		if (ces32.ces_type < 0 || ces32.ces_type >= CH_TYPES)
883			return -EINVAL;
884
885		data = compat_ptr(ces32.ces_data);
886		return ch_gstatus(ch, ces32.ces_type, data);
887	}
888	default:
889		// return scsi_ioctl_compat(ch->device, cmd, (void*)arg);
890		return -ENOIOCTLCMD;
891
892	}
893}
894#endif
895
896/* ------------------------------------------------------------------------ */
897
898static int ch_probe(struct device *dev)
899{
900	struct scsi_device *sd = to_scsi_device(dev);
901	struct device *class_dev;
902	int ret;
903	scsi_changer *ch;
904
905	if (sd->type != TYPE_MEDIUM_CHANGER)
906		return -ENODEV;
907
908	ch = kzalloc(sizeof(*ch), GFP_KERNEL);
909	if (NULL == ch)
910		return -ENOMEM;
911
912	idr_preload(GFP_KERNEL);
913	spin_lock(&ch_index_lock);
914	ret = idr_alloc(&ch_index_idr, ch, 0, CH_MAX_DEVS + 1, GFP_NOWAIT);
915	spin_unlock(&ch_index_lock);
916	idr_preload_end();
917
918	if (ret < 0) {
919		if (ret == -ENOSPC)
920			ret = -ENODEV;
921		goto free_ch;
922	}
923
924	ch->minor = ret;
925	sprintf(ch->name,"ch%d",ch->minor);
926
927	class_dev = device_create(ch_sysfs_class, dev,
928				  MKDEV(SCSI_CHANGER_MAJOR, ch->minor), ch,
929				  "s%s", ch->name);
930	if (IS_ERR(class_dev)) {
931		sdev_printk(KERN_WARNING, sd, "ch%d: device_create failed\n",
932			    ch->minor);
933		ret = PTR_ERR(class_dev);
934		goto remove_idr;
935	}
936
937	mutex_init(&ch->lock);
938	ch->device = sd;
939	ch_readconfig(ch);
940	if (init)
941		ch_init_elem(ch);
942
943	dev_set_drvdata(dev, ch);
944	sdev_printk(KERN_INFO, sd, "Attached scsi changer %s\n", ch->name);
945
946	return 0;
947remove_idr:
948	idr_remove(&ch_index_idr, ch->minor);
949free_ch:
950	kfree(ch);
951	return ret;
952}
953
954static int ch_remove(struct device *dev)
955{
956	scsi_changer *ch = dev_get_drvdata(dev);
957
958	spin_lock(&ch_index_lock);
959	idr_remove(&ch_index_idr, ch->minor);
960	spin_unlock(&ch_index_lock);
961
962	device_destroy(ch_sysfs_class, MKDEV(SCSI_CHANGER_MAJOR,ch->minor));
963	kfree(ch->dt);
964	kfree(ch);
965	return 0;
966}
967
968static struct scsi_driver ch_template = {
969	.gendrv     	= {
970		.name	= "ch",
971		.owner	= THIS_MODULE,
972		.probe  = ch_probe,
973		.remove = ch_remove,
974	},
975};
976
977static const struct file_operations changer_fops = {
978	.owner		= THIS_MODULE,
979	.open		= ch_open,
980	.release	= ch_release,
981	.unlocked_ioctl	= ch_ioctl,
982#ifdef CONFIG_COMPAT
983	.compat_ioctl	= ch_ioctl_compat,
984#endif
985	.llseek		= noop_llseek,
986};
987
988static int __init init_ch_module(void)
989{
990	int rc;
991
992	printk(KERN_INFO "SCSI Media Changer driver v" VERSION " \n");
993        ch_sysfs_class = class_create(THIS_MODULE, "scsi_changer");
994        if (IS_ERR(ch_sysfs_class)) {
995		rc = PTR_ERR(ch_sysfs_class);
996		return rc;
997        }
998	rc = register_chrdev(SCSI_CHANGER_MAJOR,"ch",&changer_fops);
999	if (rc < 0) {
1000		printk("Unable to get major %d for SCSI-Changer\n",
1001		       SCSI_CHANGER_MAJOR);
1002		goto fail1;
1003	}
1004	rc = scsi_register_driver(&ch_template.gendrv);
1005	if (rc < 0)
1006		goto fail2;
1007	return 0;
1008
1009 fail2:
1010	unregister_chrdev(SCSI_CHANGER_MAJOR, "ch");
1011 fail1:
1012	class_destroy(ch_sysfs_class);
1013	return rc;
1014}
1015
1016static void __exit exit_ch_module(void)
1017{
1018	scsi_unregister_driver(&ch_template.gendrv);
1019	unregister_chrdev(SCSI_CHANGER_MAJOR, "ch");
1020	class_destroy(ch_sysfs_class);
1021	idr_destroy(&ch_index_idr);
1022}
1023
1024module_init(init_ch_module);
1025module_exit(exit_ch_module);
1026
1027/*
1028 * Local variables:
1029 * c-basic-offset: 8
1030 * End:
1031 */
1032