blob: d6532187f616fefe0095ae11e071abaaddbb79b4 [file] [log] [blame]
Gerd Knorr daa6eda2005-05-10 10:59:13 +02001/*
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
Gerd Knorr daa6eda2005-05-10 10:59:13 +020010#include <linux/module.h>
11#include <linux/init.h>
12#include <linux/fs.h>
13#include <linux/kernel.h>
Gerd Knorr daa6eda2005-05-10 10:59:13 +020014#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>
Gerd Knorr daa6eda2005-05-10 10:59:13 +020021#include <linux/compat.h>
22#include <linux/chio.h> /* here are all the ioctls */
Arjan van de Ven0b950672006-01-11 13:16:10 +010023#include <linux/mutex.h>
FUJITA Tomonorida707c52008-01-24 17:24:50 +090024#include <linux/idr.h>
Jonathan Corbetb0061a02008-05-16 14:12:52 -060025#include <linux/smp_lock.h>
Tejun Heo5a0e3ad2010-03-24 17:04:11 +090026#include <linux/slab.h>
Gerd Knorr daa6eda2005-05-10 10:59:13 +020027
28#include <scsi/scsi.h>
29#include <scsi/scsi_cmnd.h>
30#include <scsi/scsi_driver.h>
31#include <scsi/scsi_ioctl.h>
32#include <scsi/scsi_host.h>
33#include <scsi/scsi_device.h>
James Bottomley84743bb2005-06-12 22:37:10 -050034#include <scsi/scsi_eh.h>
Gerd Knorr daa6eda2005-05-10 10:59:13 +020035#include <scsi/scsi_dbg.h>
36
37#define CH_DT_MAX 16
38#define CH_TYPES 8
FUJITA Tomonorida707c52008-01-24 17:24:50 +090039#define CH_MAX_DEVS 128
Gerd Knorr daa6eda2005-05-10 10:59:13 +020040
41MODULE_DESCRIPTION("device driver for scsi media changer devices");
42MODULE_AUTHOR("Gerd Knorr <kraxel@bytesex.org>");
43MODULE_LICENSE("GPL");
Rene Hermanf018fa52006-03-08 00:14:20 -080044MODULE_ALIAS_CHARDEV_MAJOR(SCSI_CHANGER_MAJOR);
Scott James Remnant95f6c832009-03-10 16:19:44 +000045MODULE_ALIAS_SCSI_DEVICE(TYPE_MEDIUM_CHANGER);
Gerd Knorr daa6eda2005-05-10 10:59:13 +020046
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
Arjan van de Ven0ad78202005-11-28 16:22:25 +010082static const char * vendor_labels[CH_TYPES-4] = {
Gerd Knorr daa6eda2005-05-10 10:59:13 +020083 "v0", "v1", "v2", "v3"
84};
85// module_param_string_array(vendor_labels, NULL, 0444);
86
Joe Perches87da3232010-08-10 18:01:22 -070087#define DPRINTK(fmt, arg...) \
88do { \
89 if (debug) \
90 printk(KERN_DEBUG "%s: " fmt, ch->name, ##arg); \
91} while (0)
92#define VPRINTK(level, fmt, arg...) \
93do { \
94 if (verbose) \
95 printk(level "%s: " fmt, ch->name, ##arg); \
96} while (0)
Gerd Knorr daa6eda2005-05-10 10:59:13 +020097
98/* ------------------------------------------------------------------- */
99
100#define MAX_RETRIES 1
101
Gerd Knorr 21feb5c2005-05-12 10:25:26 +0200102static struct class * ch_sysfs_class;
Gerd Knorr daa6eda2005-05-10 10:59:13 +0200103
104typedef struct {
105 struct list_head list;
106 int minor;
107 char name[8];
108 struct scsi_device *device;
109 struct scsi_device **dt; /* ptrs to data transfer elements */
110 u_int firsts[CH_TYPES];
111 u_int counts[CH_TYPES];
112 u_int unit_attention;
113 u_int voltags;
Arjan van de Ven0b950672006-01-11 13:16:10 +0100114 struct mutex lock;
Gerd Knorr daa6eda2005-05-10 10:59:13 +0200115} scsi_changer;
116
FUJITA Tomonorida707c52008-01-24 17:24:50 +0900117static DEFINE_IDR(ch_index_idr);
118static DEFINE_SPINLOCK(ch_index_lock);
Gerd Knorr daa6eda2005-05-10 10:59:13 +0200119
Arjan van de Ven0ad78202005-11-28 16:22:25 +0100120static const struct {
Gerd Knorr daa6eda2005-05-10 10:59:13 +0200121 unsigned char sense;
122 unsigned char asc;
123 unsigned char ascq;
124 int errno;
Harvey Harrisond70d4662008-03-31 22:05:30 -0700125} ch_err[] = {
Gerd Knorr daa6eda2005-05-10 10:59:13 +0200126/* Just filled in what looks right. Hav'nt checked any standard paper for
127 these errno assignments, so they may be wrong... */
128 {
129 .sense = ILLEGAL_REQUEST,
130 .asc = 0x21,
131 .ascq = 0x01,
132 .errno = EBADSLT, /* Invalid element address */
133 },{
134 .sense = ILLEGAL_REQUEST,
135 .asc = 0x28,
136 .ascq = 0x01,
137 .errno = EBADE, /* Import or export element accessed */
138 },{
139 .sense = ILLEGAL_REQUEST,
140 .asc = 0x3B,
141 .ascq = 0x0D,
142 .errno = EXFULL, /* Medium destination element full */
143 },{
144 .sense = ILLEGAL_REQUEST,
145 .asc = 0x3B,
146 .ascq = 0x0E,
147 .errno = EBADE, /* Medium source element empty */
148 },{
149 .sense = ILLEGAL_REQUEST,
150 .asc = 0x20,
151 .ascq = 0x00,
152 .errno = EBADRQC, /* Invalid command operation code */
153 },{
154 /* end of list */
155 }
156};
157
158/* ------------------------------------------------------------------- */
159
James Bottomley84743bb2005-06-12 22:37:10 -0500160static int ch_find_errno(struct scsi_sense_hdr *sshdr)
Gerd Knorr daa6eda2005-05-10 10:59:13 +0200161{
162 int i,errno = 0;
163
164 /* Check to see if additional sense information is available */
James Bottomley84743bb2005-06-12 22:37:10 -0500165 if (scsi_sense_valid(sshdr) &&
166 sshdr->asc != 0) {
Harvey Harrisond70d4662008-03-31 22:05:30 -0700167 for (i = 0; ch_err[i].errno != 0; i++) {
168 if (ch_err[i].sense == sshdr->sense_key &&
169 ch_err[i].asc == sshdr->asc &&
170 ch_err[i].ascq == sshdr->ascq) {
171 errno = -ch_err[i].errno;
Gerd Knorr daa6eda2005-05-10 10:59:13 +0200172 break;
173 }
174 }
175 }
176 if (errno == 0)
177 errno = -EIO;
178 return errno;
179}
180
181static int
182ch_do_scsi(scsi_changer *ch, unsigned char *cmd,
183 void *buffer, unsigned buflength,
184 enum dma_data_direction direction)
185{
James Bottomley84743bb2005-06-12 22:37:10 -0500186 int errno, retries = 0, timeout, result;
187 struct scsi_sense_hdr sshdr;
FUJITA Tomonori5aa22af2008-01-24 17:24:52 +0900188
Gerd Knorr daa6eda2005-05-10 10:59:13 +0200189 timeout = (cmd[0] == INITIALIZE_ELEMENT_STATUS)
190 ? timeout_init : timeout_move;
191
192 retry:
193 errno = 0;
194 if (debug) {
Joe Perches87da3232010-08-10 18:01:22 -0700195 DPRINTK("command: ");
Gerd Knorr daa6eda2005-05-10 10:59:13 +0200196 __scsi_print_command(cmd);
197 }
198
James Bottomley84743bb2005-06-12 22:37:10 -0500199 result = scsi_execute_req(ch->device, cmd, direction, buffer,
200 buflength, &sshdr, timeout * HZ,
FUJITA Tomonorif4f4e472008-12-04 14:24:39 +0900201 MAX_RETRIES, NULL);
Gerd Knorr daa6eda2005-05-10 10:59:13 +0200202
Joe Perches87da3232010-08-10 18:01:22 -0700203 DPRINTK("result: 0x%x\n",result);
James Bottomley84743bb2005-06-12 22:37:10 -0500204 if (driver_byte(result) & DRIVER_SENSE) {
Gerd Knorr daa6eda2005-05-10 10:59:13 +0200205 if (debug)
James Bottomley84743bb2005-06-12 22:37:10 -0500206 scsi_print_sense_hdr(ch->name, &sshdr);
207 errno = ch_find_errno(&sshdr);
Gerd Knorr daa6eda2005-05-10 10:59:13 +0200208
James Bottomley84743bb2005-06-12 22:37:10 -0500209 switch(sshdr.sense_key) {
Gerd Knorr daa6eda2005-05-10 10:59:13 +0200210 case UNIT_ATTENTION:
211 ch->unit_attention = 1;
212 if (retries++ < 3)
213 goto retry;
214 break;
215 }
216 }
Gerd Knorr daa6eda2005-05-10 10:59:13 +0200217 return errno;
218}
219
220/* ------------------------------------------------------------------------ */
221
222static int
223ch_elem_to_typecode(scsi_changer *ch, u_int elem)
224{
225 int i;
FUJITA Tomonori5aa22af2008-01-24 17:24:52 +0900226
Gerd Knorr daa6eda2005-05-10 10:59:13 +0200227 for (i = 0; i < CH_TYPES; i++) {
228 if (elem >= ch->firsts[i] &&
229 elem < ch->firsts[i] +
230 ch->counts[i])
231 return i+1;
232 }
233 return 0;
234}
235
236static int
237ch_read_element_status(scsi_changer *ch, u_int elem, char *data)
238{
239 u_char cmd[12];
240 u_char *buffer;
241 int result;
FUJITA Tomonori5aa22af2008-01-24 17:24:52 +0900242
Gerd Knorr daa6eda2005-05-10 10:59:13 +0200243 buffer = kmalloc(512, GFP_KERNEL | GFP_DMA);
244 if(!buffer)
245 return -ENOMEM;
FUJITA Tomonori5aa22af2008-01-24 17:24:52 +0900246
Gerd Knorr daa6eda2005-05-10 10:59:13 +0200247 retry:
248 memset(cmd,0,sizeof(cmd));
249 cmd[0] = READ_ELEMENT_STATUS;
FUJITA Tomonori5aa22af2008-01-24 17:24:52 +0900250 cmd[1] = (ch->device->lun << 5) |
Gerd Knorr daa6eda2005-05-10 10:59:13 +0200251 (ch->voltags ? 0x10 : 0) |
252 ch_elem_to_typecode(ch,elem);
253 cmd[2] = (elem >> 8) & 0xff;
254 cmd[3] = elem & 0xff;
255 cmd[5] = 1;
256 cmd[9] = 255;
257 if (0 == (result = ch_do_scsi(ch, cmd, buffer, 256, DMA_FROM_DEVICE))) {
258 if (((buffer[16] << 8) | buffer[17]) != elem) {
Joe Perches87da3232010-08-10 18:01:22 -0700259 DPRINTK("asked for element 0x%02x, got 0x%02x\n",
Gerd Knorr daa6eda2005-05-10 10:59:13 +0200260 elem,(buffer[16] << 8) | buffer[17]);
261 kfree(buffer);
262 return -EIO;
263 }
264 memcpy(data,buffer+16,16);
265 } else {
266 if (ch->voltags) {
267 ch->voltags = 0;
Joe Perches87da3232010-08-10 18:01:22 -0700268 VPRINTK(KERN_INFO, "device has no volume tag support\n");
Gerd Knorr daa6eda2005-05-10 10:59:13 +0200269 goto retry;
270 }
Joe Perches87da3232010-08-10 18:01:22 -0700271 DPRINTK("READ ELEMENT STATUS for element 0x%x failed\n",elem);
Gerd Knorr daa6eda2005-05-10 10:59:13 +0200272 }
273 kfree(buffer);
274 return result;
275}
276
FUJITA Tomonori5aa22af2008-01-24 17:24:52 +0900277static int
Gerd Knorr daa6eda2005-05-10 10:59:13 +0200278ch_init_elem(scsi_changer *ch)
279{
280 int err;
281 u_char cmd[6];
282
Joe Perches87da3232010-08-10 18:01:22 -0700283 VPRINTK(KERN_INFO, "INITIALIZE ELEMENT STATUS, may take some time ...\n");
Gerd Knorr daa6eda2005-05-10 10:59:13 +0200284 memset(cmd,0,sizeof(cmd));
285 cmd[0] = INITIALIZE_ELEMENT_STATUS;
286 cmd[1] = ch->device->lun << 5;
287 err = ch_do_scsi(ch, cmd, NULL, 0, DMA_NONE);
Joe Perches87da3232010-08-10 18:01:22 -0700288 VPRINTK(KERN_INFO, "... finished\n");
Gerd Knorr daa6eda2005-05-10 10:59:13 +0200289 return err;
290}
291
292static int
293ch_readconfig(scsi_changer *ch)
294{
295 u_char cmd[10], data[16];
296 u_char *buffer;
297 int result,id,lun,i;
298 u_int elem;
299
vignesh.babu@wipro.com4530a162007-04-16 11:35:33 +0530300 buffer = kzalloc(512, GFP_KERNEL | GFP_DMA);
Gerd Knorr daa6eda2005-05-10 10:59:13 +0200301 if (!buffer)
302 return -ENOMEM;
FUJITA Tomonori5aa22af2008-01-24 17:24:52 +0900303
Gerd Knorr daa6eda2005-05-10 10:59:13 +0200304 memset(cmd,0,sizeof(cmd));
305 cmd[0] = MODE_SENSE;
306 cmd[1] = ch->device->lun << 5;
307 cmd[2] = 0x1d;
308 cmd[4] = 255;
309 result = ch_do_scsi(ch, cmd, buffer, 255, DMA_FROM_DEVICE);
310 if (0 != result) {
311 cmd[1] |= (1<<3);
312 result = ch_do_scsi(ch, cmd, buffer, 255, DMA_FROM_DEVICE);
313 }
314 if (0 == result) {
315 ch->firsts[CHET_MT] =
316 (buffer[buffer[3]+ 6] << 8) | buffer[buffer[3]+ 7];
317 ch->counts[CHET_MT] =
318 (buffer[buffer[3]+ 8] << 8) | buffer[buffer[3]+ 9];
319 ch->firsts[CHET_ST] =
320 (buffer[buffer[3]+10] << 8) | buffer[buffer[3]+11];
321 ch->counts[CHET_ST] =
322 (buffer[buffer[3]+12] << 8) | buffer[buffer[3]+13];
323 ch->firsts[CHET_IE] =
324 (buffer[buffer[3]+14] << 8) | buffer[buffer[3]+15];
325 ch->counts[CHET_IE] =
326 (buffer[buffer[3]+16] << 8) | buffer[buffer[3]+17];
327 ch->firsts[CHET_DT] =
328 (buffer[buffer[3]+18] << 8) | buffer[buffer[3]+19];
329 ch->counts[CHET_DT] =
330 (buffer[buffer[3]+20] << 8) | buffer[buffer[3]+21];
Joe Perches87da3232010-08-10 18:01:22 -0700331 VPRINTK(KERN_INFO, "type #1 (mt): 0x%x+%d [medium transport]\n",
Gerd Knorr daa6eda2005-05-10 10:59:13 +0200332 ch->firsts[CHET_MT],
333 ch->counts[CHET_MT]);
Joe Perches87da3232010-08-10 18:01:22 -0700334 VPRINTK(KERN_INFO, "type #2 (st): 0x%x+%d [storage]\n",
Gerd Knorr daa6eda2005-05-10 10:59:13 +0200335 ch->firsts[CHET_ST],
336 ch->counts[CHET_ST]);
Joe Perches87da3232010-08-10 18:01:22 -0700337 VPRINTK(KERN_INFO, "type #3 (ie): 0x%x+%d [import/export]\n",
Gerd Knorr daa6eda2005-05-10 10:59:13 +0200338 ch->firsts[CHET_IE],
339 ch->counts[CHET_IE]);
Joe Perches87da3232010-08-10 18:01:22 -0700340 VPRINTK(KERN_INFO, "type #4 (dt): 0x%x+%d [data transfer]\n",
Gerd Knorr daa6eda2005-05-10 10:59:13 +0200341 ch->firsts[CHET_DT],
342 ch->counts[CHET_DT]);
343 } else {
Joe Perches87da3232010-08-10 18:01:22 -0700344 VPRINTK(KERN_INFO, "reading element address assigment page failed!\n");
Gerd Knorr daa6eda2005-05-10 10:59:13 +0200345 }
FUJITA Tomonori5aa22af2008-01-24 17:24:52 +0900346
Gerd Knorr daa6eda2005-05-10 10:59:13 +0200347 /* vendor specific element types */
348 for (i = 0; i < 4; i++) {
349 if (0 == vendor_counts[i])
350 continue;
351 if (NULL == vendor_labels[i])
352 continue;
353 ch->firsts[CHET_V1+i] = vendor_firsts[i];
354 ch->counts[CHET_V1+i] = vendor_counts[i];
Joe Perches87da3232010-08-10 18:01:22 -0700355 VPRINTK(KERN_INFO, "type #%d (v%d): 0x%x+%d [%s, vendor specific]\n",
Gerd Knorr daa6eda2005-05-10 10:59:13 +0200356 i+5,i+1,vendor_firsts[i],vendor_counts[i],
357 vendor_labels[i]);
358 }
359
360 /* look up the devices of the data transfer elements */
Julia Lawall85bc0812010-08-10 18:01:18 -0700361 ch->dt = kcalloc(ch->counts[CHET_DT], sizeof(*ch->dt),
Gerd Knorr daa6eda2005-05-10 10:59:13 +0200362 GFP_KERNEL);
Davidlohr Bueso Aa2cf8a62009-08-07 16:42:21 -0400363
364 if (!ch->dt) {
365 kfree(buffer);
366 return -ENOMEM;
367 }
368
Gerd Knorr daa6eda2005-05-10 10:59:13 +0200369 for (elem = 0; elem < ch->counts[CHET_DT]; elem++) {
370 id = -1;
371 lun = 0;
372 if (elem < CH_DT_MAX && -1 != dt_id[elem]) {
373 id = dt_id[elem];
374 lun = dt_lun[elem];
Joe Perches87da3232010-08-10 18:01:22 -0700375 VPRINTK(KERN_INFO, "dt 0x%x: [insmod option] ",
Gerd Knorr daa6eda2005-05-10 10:59:13 +0200376 elem+ch->firsts[CHET_DT]);
377 } else if (0 != ch_read_element_status
378 (ch,elem+ch->firsts[CHET_DT],data)) {
Joe Perches87da3232010-08-10 18:01:22 -0700379 VPRINTK(KERN_INFO, "dt 0x%x: READ ELEMENT STATUS failed\n",
Gerd Knorr daa6eda2005-05-10 10:59:13 +0200380 elem+ch->firsts[CHET_DT]);
381 } else {
Joe Perches87da3232010-08-10 18:01:22 -0700382 VPRINTK(KERN_INFO, "dt 0x%x: ",elem+ch->firsts[CHET_DT]);
Gerd Knorr daa6eda2005-05-10 10:59:13 +0200383 if (data[6] & 0x80) {
Joe Perches87da3232010-08-10 18:01:22 -0700384 VPRINTK(KERN_CONT, "not this SCSI bus\n");
Gerd Knorr daa6eda2005-05-10 10:59:13 +0200385 ch->dt[elem] = NULL;
386 } else if (0 == (data[6] & 0x30)) {
Joe Perches87da3232010-08-10 18:01:22 -0700387 VPRINTK(KERN_CONT, "ID/LUN unknown\n");
Gerd Knorr daa6eda2005-05-10 10:59:13 +0200388 ch->dt[elem] = NULL;
389 } else {
390 id = ch->device->id;
391 lun = 0;
392 if (data[6] & 0x20) id = data[7];
393 if (data[6] & 0x10) lun = data[6] & 7;
394 }
395 }
396 if (-1 != id) {
Joe Perches87da3232010-08-10 18:01:22 -0700397 VPRINTK(KERN_CONT, "ID %i, LUN %i, ",id,lun);
Gerd Knorr daa6eda2005-05-10 10:59:13 +0200398 ch->dt[elem] =
399 scsi_device_lookup(ch->device->host,
400 ch->device->channel,
401 id,lun);
402 if (!ch->dt[elem]) {
403 /* should not happen */
Joe Perches87da3232010-08-10 18:01:22 -0700404 VPRINTK(KERN_CONT, "Huh? device not found!\n");
Gerd Knorr daa6eda2005-05-10 10:59:13 +0200405 } else {
Joe Perches87da3232010-08-10 18:01:22 -0700406 VPRINTK(KERN_CONT, "name: %8.8s %16.16s %4.4s\n",
407 ch->dt[elem]->vendor,
408 ch->dt[elem]->model,
409 ch->dt[elem]->rev);
Gerd Knorr daa6eda2005-05-10 10:59:13 +0200410 }
411 }
412 }
413 ch->voltags = 1;
414 kfree(buffer);
415
416 return 0;
417}
418
419/* ------------------------------------------------------------------------ */
420
421static int
422ch_position(scsi_changer *ch, u_int trans, u_int elem, int rotate)
423{
424 u_char cmd[10];
FUJITA Tomonori5aa22af2008-01-24 17:24:52 +0900425
Joe Perches87da3232010-08-10 18:01:22 -0700426 DPRINTK("position: 0x%x\n",elem);
Gerd Knorr daa6eda2005-05-10 10:59:13 +0200427 if (0 == trans)
428 trans = ch->firsts[CHET_MT];
429 memset(cmd,0,sizeof(cmd));
430 cmd[0] = POSITION_TO_ELEMENT;
431 cmd[1] = ch->device->lun << 5;
432 cmd[2] = (trans >> 8) & 0xff;
433 cmd[3] = trans & 0xff;
434 cmd[4] = (elem >> 8) & 0xff;
435 cmd[5] = elem & 0xff;
436 cmd[8] = rotate ? 1 : 0;
437 return ch_do_scsi(ch, cmd, NULL, 0, DMA_NONE);
438}
439
440static int
441ch_move(scsi_changer *ch, u_int trans, u_int src, u_int dest, int rotate)
442{
443 u_char cmd[12];
FUJITA Tomonori5aa22af2008-01-24 17:24:52 +0900444
Joe Perches87da3232010-08-10 18:01:22 -0700445 DPRINTK("move: 0x%x => 0x%x\n",src,dest);
Gerd Knorr daa6eda2005-05-10 10:59:13 +0200446 if (0 == trans)
447 trans = ch->firsts[CHET_MT];
448 memset(cmd,0,sizeof(cmd));
449 cmd[0] = MOVE_MEDIUM;
450 cmd[1] = ch->device->lun << 5;
451 cmd[2] = (trans >> 8) & 0xff;
452 cmd[3] = trans & 0xff;
453 cmd[4] = (src >> 8) & 0xff;
454 cmd[5] = src & 0xff;
455 cmd[6] = (dest >> 8) & 0xff;
456 cmd[7] = dest & 0xff;
457 cmd[10] = rotate ? 1 : 0;
458 return ch_do_scsi(ch, cmd, NULL,0, DMA_NONE);
459}
460
461static int
462ch_exchange(scsi_changer *ch, u_int trans, u_int src,
463 u_int dest1, u_int dest2, int rotate1, int rotate2)
464{
465 u_char cmd[12];
FUJITA Tomonori5aa22af2008-01-24 17:24:52 +0900466
Joe Perches87da3232010-08-10 18:01:22 -0700467 DPRINTK("exchange: 0x%x => 0x%x => 0x%x\n",
Gerd Knorr daa6eda2005-05-10 10:59:13 +0200468 src,dest1,dest2);
469 if (0 == trans)
470 trans = ch->firsts[CHET_MT];
471 memset(cmd,0,sizeof(cmd));
472 cmd[0] = EXCHANGE_MEDIUM;
473 cmd[1] = ch->device->lun << 5;
474 cmd[2] = (trans >> 8) & 0xff;
475 cmd[3] = trans & 0xff;
476 cmd[4] = (src >> 8) & 0xff;
477 cmd[5] = src & 0xff;
478 cmd[6] = (dest1 >> 8) & 0xff;
479 cmd[7] = dest1 & 0xff;
480 cmd[8] = (dest2 >> 8) & 0xff;
481 cmd[9] = dest2 & 0xff;
482 cmd[10] = (rotate1 ? 1 : 0) | (rotate2 ? 2 : 0);
FUJITA Tomonori5aa22af2008-01-24 17:24:52 +0900483
Gerd Knorr daa6eda2005-05-10 10:59:13 +0200484 return ch_do_scsi(ch, cmd, NULL,0, DMA_NONE);
485}
486
487static void
488ch_check_voltag(char *tag)
489{
490 int i;
491
492 for (i = 0; i < 32; i++) {
493 /* restrict to ascii */
494 if (tag[i] >= 0x7f || tag[i] < 0x20)
495 tag[i] = ' ';
496 /* don't allow search wildcards */
497 if (tag[i] == '?' ||
498 tag[i] == '*')
499 tag[i] = ' ';
500 }
501}
502
503static int
504ch_set_voltag(scsi_changer *ch, u_int elem,
505 int alternate, int clear, u_char *tag)
506{
507 u_char cmd[12];
508 u_char *buffer;
509 int result;
510
vignesh.babu@wipro.com4530a162007-04-16 11:35:33 +0530511 buffer = kzalloc(512, GFP_KERNEL);
Gerd Knorr daa6eda2005-05-10 10:59:13 +0200512 if (!buffer)
513 return -ENOMEM;
Gerd Knorr daa6eda2005-05-10 10:59:13 +0200514
Joe Perches87da3232010-08-10 18:01:22 -0700515 DPRINTK("%s %s voltag: 0x%x => \"%s\"\n",
Gerd Knorr daa6eda2005-05-10 10:59:13 +0200516 clear ? "clear" : "set",
517 alternate ? "alternate" : "primary",
518 elem, tag);
519 memset(cmd,0,sizeof(cmd));
520 cmd[0] = SEND_VOLUME_TAG;
FUJITA Tomonori5aa22af2008-01-24 17:24:52 +0900521 cmd[1] = (ch->device->lun << 5) |
Gerd Knorr daa6eda2005-05-10 10:59:13 +0200522 ch_elem_to_typecode(ch,elem);
523 cmd[2] = (elem >> 8) & 0xff;
524 cmd[3] = elem & 0xff;
525 cmd[5] = clear
526 ? (alternate ? 0x0d : 0x0c)
527 : (alternate ? 0x0b : 0x0a);
FUJITA Tomonori5aa22af2008-01-24 17:24:52 +0900528
Gerd Knorr daa6eda2005-05-10 10:59:13 +0200529 cmd[9] = 255;
530
531 memcpy(buffer,tag,32);
532 ch_check_voltag(buffer);
533
534 result = ch_do_scsi(ch, cmd, buffer, 256, DMA_TO_DEVICE);
535 kfree(buffer);
536 return result;
537}
538
viro@ZenIV.linux.org.ukfe08ac32005-09-09 22:03:44 +0100539static int ch_gstatus(scsi_changer *ch, int type, unsigned char __user *dest)
Gerd Knorr daa6eda2005-05-10 10:59:13 +0200540{
541 int retval = 0;
542 u_char data[16];
543 unsigned int i;
FUJITA Tomonori5aa22af2008-01-24 17:24:52 +0900544
Arjan van de Ven0b950672006-01-11 13:16:10 +0100545 mutex_lock(&ch->lock);
Gerd Knorr daa6eda2005-05-10 10:59:13 +0200546 for (i = 0; i < ch->counts[type]; i++) {
547 if (0 != ch_read_element_status
548 (ch, ch->firsts[type]+i,data)) {
549 retval = -EIO;
550 break;
551 }
552 put_user(data[2], dest+i);
553 if (data[2] & CESTATUS_EXCEPT)
Joe Perches87da3232010-08-10 18:01:22 -0700554 VPRINTK(KERN_INFO, "element 0x%x: asc=0x%x, ascq=0x%x\n",
Gerd Knorr daa6eda2005-05-10 10:59:13 +0200555 ch->firsts[type]+i,
556 (int)data[4],(int)data[5]);
557 retval = ch_read_element_status
558 (ch, ch->firsts[type]+i,data);
559 if (0 != retval)
560 break;
561 }
Arjan van de Ven0b950672006-01-11 13:16:10 +0100562 mutex_unlock(&ch->lock);
Gerd Knorr daa6eda2005-05-10 10:59:13 +0200563 return retval;
564}
565
566/* ------------------------------------------------------------------------ */
567
568static int
569ch_release(struct inode *inode, struct file *file)
570{
571 scsi_changer *ch = file->private_data;
572
573 scsi_device_put(ch->device);
574 file->private_data = NULL;
575 return 0;
576}
577
578static int
579ch_open(struct inode *inode, struct file *file)
580{
FUJITA Tomonorida707c52008-01-24 17:24:50 +0900581 scsi_changer *ch;
Gerd Knorr daa6eda2005-05-10 10:59:13 +0200582 int minor = iminor(inode);
583
Jonathan Corbetb0061a02008-05-16 14:12:52 -0600584 lock_kernel();
FUJITA Tomonorida707c52008-01-24 17:24:50 +0900585 spin_lock(&ch_index_lock);
586 ch = idr_find(&ch_index_idr, minor);
587
Gerd Knorr daa6eda2005-05-10 10:59:13 +0200588 if (NULL == ch || scsi_device_get(ch->device)) {
FUJITA Tomonorida707c52008-01-24 17:24:50 +0900589 spin_unlock(&ch_index_lock);
Jonathan Corbetb0061a02008-05-16 14:12:52 -0600590 unlock_kernel();
Gerd Knorr daa6eda2005-05-10 10:59:13 +0200591 return -ENXIO;
592 }
FUJITA Tomonorida707c52008-01-24 17:24:50 +0900593 spin_unlock(&ch_index_lock);
Gerd Knorr daa6eda2005-05-10 10:59:13 +0200594
595 file->private_data = ch;
Jonathan Corbetb0061a02008-05-16 14:12:52 -0600596 unlock_kernel();
Gerd Knorr daa6eda2005-05-10 10:59:13 +0200597 return 0;
598}
599
600static int
601ch_checkrange(scsi_changer *ch, unsigned int type, unsigned int unit)
602{
603 if (type >= CH_TYPES || unit >= ch->counts[type])
604 return -1;
605 return 0;
606}
607
Mathieu Segaudf7fea182008-01-14 15:43:18 +0100608static long ch_ioctl(struct file *file,
Gerd Knorr daa6eda2005-05-10 10:59:13 +0200609 unsigned int cmd, unsigned long arg)
610{
611 scsi_changer *ch = file->private_data;
612 int retval;
viro@ZenIV.linux.org.ukfe08ac32005-09-09 22:03:44 +0100613 void __user *argp = (void __user *)arg;
FUJITA Tomonori5aa22af2008-01-24 17:24:52 +0900614
Gerd Knorr daa6eda2005-05-10 10:59:13 +0200615 switch (cmd) {
616 case CHIOGPARAMS:
617 {
618 struct changer_params params;
FUJITA Tomonori5aa22af2008-01-24 17:24:52 +0900619
Gerd Knorr daa6eda2005-05-10 10:59:13 +0200620 params.cp_curpicker = 0;
621 params.cp_npickers = ch->counts[CHET_MT];
622 params.cp_nslots = ch->counts[CHET_ST];
623 params.cp_nportals = ch->counts[CHET_IE];
624 params.cp_ndrives = ch->counts[CHET_DT];
FUJITA Tomonori5aa22af2008-01-24 17:24:52 +0900625
viro@ZenIV.linux.org.ukfe08ac32005-09-09 22:03:44 +0100626 if (copy_to_user(argp, &params, sizeof(params)))
Gerd Knorr daa6eda2005-05-10 10:59:13 +0200627 return -EFAULT;
628 return 0;
629 }
630 case CHIOGVPARAMS:
631 {
632 struct changer_vendor_params vparams;
633
634 memset(&vparams,0,sizeof(vparams));
635 if (ch->counts[CHET_V1]) {
636 vparams.cvp_n1 = ch->counts[CHET_V1];
637 strncpy(vparams.cvp_label1,vendor_labels[0],16);
638 }
639 if (ch->counts[CHET_V2]) {
640 vparams.cvp_n2 = ch->counts[CHET_V2];
641 strncpy(vparams.cvp_label2,vendor_labels[1],16);
642 }
643 if (ch->counts[CHET_V3]) {
644 vparams.cvp_n3 = ch->counts[CHET_V3];
645 strncpy(vparams.cvp_label3,vendor_labels[2],16);
646 }
647 if (ch->counts[CHET_V4]) {
648 vparams.cvp_n4 = ch->counts[CHET_V4];
649 strncpy(vparams.cvp_label4,vendor_labels[3],16);
650 }
viro@ZenIV.linux.org.ukfe08ac32005-09-09 22:03:44 +0100651 if (copy_to_user(argp, &vparams, sizeof(vparams)))
Gerd Knorr daa6eda2005-05-10 10:59:13 +0200652 return -EFAULT;
653 return 0;
654 }
FUJITA Tomonori5aa22af2008-01-24 17:24:52 +0900655
Gerd Knorr daa6eda2005-05-10 10:59:13 +0200656 case CHIOPOSITION:
657 {
658 struct changer_position pos;
FUJITA Tomonori5aa22af2008-01-24 17:24:52 +0900659
viro@ZenIV.linux.org.ukfe08ac32005-09-09 22:03:44 +0100660 if (copy_from_user(&pos, argp, sizeof (pos)))
Gerd Knorr daa6eda2005-05-10 10:59:13 +0200661 return -EFAULT;
662
663 if (0 != ch_checkrange(ch, pos.cp_type, pos.cp_unit)) {
Joe Perches87da3232010-08-10 18:01:22 -0700664 DPRINTK("CHIOPOSITION: invalid parameter\n");
Gerd Knorr daa6eda2005-05-10 10:59:13 +0200665 return -EBADSLT;
666 }
Arjan van de Ven0b950672006-01-11 13:16:10 +0100667 mutex_lock(&ch->lock);
Gerd Knorr daa6eda2005-05-10 10:59:13 +0200668 retval = ch_position(ch,0,
669 ch->firsts[pos.cp_type] + pos.cp_unit,
670 pos.cp_flags & CP_INVERT);
Arjan van de Ven0b950672006-01-11 13:16:10 +0100671 mutex_unlock(&ch->lock);
Gerd Knorr daa6eda2005-05-10 10:59:13 +0200672 return retval;
673 }
FUJITA Tomonori5aa22af2008-01-24 17:24:52 +0900674
Gerd Knorr daa6eda2005-05-10 10:59:13 +0200675 case CHIOMOVE:
676 {
677 struct changer_move mv;
678
viro@ZenIV.linux.org.ukfe08ac32005-09-09 22:03:44 +0100679 if (copy_from_user(&mv, argp, sizeof (mv)))
Gerd Knorr daa6eda2005-05-10 10:59:13 +0200680 return -EFAULT;
681
682 if (0 != ch_checkrange(ch, mv.cm_fromtype, mv.cm_fromunit) ||
683 0 != ch_checkrange(ch, mv.cm_totype, mv.cm_tounit )) {
Joe Perches87da3232010-08-10 18:01:22 -0700684 DPRINTK("CHIOMOVE: invalid parameter\n");
Gerd Knorr daa6eda2005-05-10 10:59:13 +0200685 return -EBADSLT;
686 }
FUJITA Tomonori5aa22af2008-01-24 17:24:52 +0900687
Arjan van de Ven0b950672006-01-11 13:16:10 +0100688 mutex_lock(&ch->lock);
Gerd Knorr daa6eda2005-05-10 10:59:13 +0200689 retval = ch_move(ch,0,
690 ch->firsts[mv.cm_fromtype] + mv.cm_fromunit,
691 ch->firsts[mv.cm_totype] + mv.cm_tounit,
692 mv.cm_flags & CM_INVERT);
Arjan van de Ven0b950672006-01-11 13:16:10 +0100693 mutex_unlock(&ch->lock);
Gerd Knorr daa6eda2005-05-10 10:59:13 +0200694 return retval;
695 }
696
697 case CHIOEXCHANGE:
698 {
699 struct changer_exchange mv;
FUJITA Tomonori5aa22af2008-01-24 17:24:52 +0900700
viro@ZenIV.linux.org.ukfe08ac32005-09-09 22:03:44 +0100701 if (copy_from_user(&mv, argp, sizeof (mv)))
Gerd Knorr daa6eda2005-05-10 10:59:13 +0200702 return -EFAULT;
703
704 if (0 != ch_checkrange(ch, mv.ce_srctype, mv.ce_srcunit ) ||
705 0 != ch_checkrange(ch, mv.ce_fdsttype, mv.ce_fdstunit) ||
706 0 != ch_checkrange(ch, mv.ce_sdsttype, mv.ce_sdstunit)) {
Joe Perches87da3232010-08-10 18:01:22 -0700707 DPRINTK("CHIOEXCHANGE: invalid parameter\n");
Gerd Knorr daa6eda2005-05-10 10:59:13 +0200708 return -EBADSLT;
709 }
FUJITA Tomonori5aa22af2008-01-24 17:24:52 +0900710
Arjan van de Ven0b950672006-01-11 13:16:10 +0100711 mutex_lock(&ch->lock);
Gerd Knorr daa6eda2005-05-10 10:59:13 +0200712 retval = ch_exchange
713 (ch,0,
714 ch->firsts[mv.ce_srctype] + mv.ce_srcunit,
715 ch->firsts[mv.ce_fdsttype] + mv.ce_fdstunit,
716 ch->firsts[mv.ce_sdsttype] + mv.ce_sdstunit,
717 mv.ce_flags & CE_INVERT1, mv.ce_flags & CE_INVERT2);
Arjan van de Ven0b950672006-01-11 13:16:10 +0100718 mutex_unlock(&ch->lock);
Gerd Knorr daa6eda2005-05-10 10:59:13 +0200719 return retval;
720 }
721
722 case CHIOGSTATUS:
723 {
724 struct changer_element_status ces;
FUJITA Tomonori5aa22af2008-01-24 17:24:52 +0900725
viro@ZenIV.linux.org.ukfe08ac32005-09-09 22:03:44 +0100726 if (copy_from_user(&ces, argp, sizeof (ces)))
Gerd Knorr daa6eda2005-05-10 10:59:13 +0200727 return -EFAULT;
728 if (ces.ces_type < 0 || ces.ces_type >= CH_TYPES)
729 return -EINVAL;
730
731 return ch_gstatus(ch, ces.ces_type, ces.ces_data);
732 }
733
734 case CHIOGELEM:
735 {
736 struct changer_get_element cge;
Harvey Harrisond70d4662008-03-31 22:05:30 -0700737 u_char ch_cmd[12];
738 u_char *buffer;
Gerd Knorr daa6eda2005-05-10 10:59:13 +0200739 unsigned int elem;
740 int result,i;
FUJITA Tomonori5aa22af2008-01-24 17:24:52 +0900741
viro@ZenIV.linux.org.ukfe08ac32005-09-09 22:03:44 +0100742 if (copy_from_user(&cge, argp, sizeof (cge)))
Gerd Knorr daa6eda2005-05-10 10:59:13 +0200743 return -EFAULT;
744
745 if (0 != ch_checkrange(ch, cge.cge_type, cge.cge_unit))
746 return -EINVAL;
747 elem = ch->firsts[cge.cge_type] + cge.cge_unit;
FUJITA Tomonori5aa22af2008-01-24 17:24:52 +0900748
Gerd Knorr daa6eda2005-05-10 10:59:13 +0200749 buffer = kmalloc(512, GFP_KERNEL | GFP_DMA);
750 if (!buffer)
751 return -ENOMEM;
Arjan van de Ven0b950672006-01-11 13:16:10 +0100752 mutex_lock(&ch->lock);
FUJITA Tomonori5aa22af2008-01-24 17:24:52 +0900753
Gerd Knorr daa6eda2005-05-10 10:59:13 +0200754 voltag_retry:
Harvey Harrisond70d4662008-03-31 22:05:30 -0700755 memset(ch_cmd, 0, sizeof(ch_cmd));
756 ch_cmd[0] = READ_ELEMENT_STATUS;
757 ch_cmd[1] = (ch->device->lun << 5) |
Gerd Knorr daa6eda2005-05-10 10:59:13 +0200758 (ch->voltags ? 0x10 : 0) |
759 ch_elem_to_typecode(ch,elem);
Harvey Harrisond70d4662008-03-31 22:05:30 -0700760 ch_cmd[2] = (elem >> 8) & 0xff;
761 ch_cmd[3] = elem & 0xff;
762 ch_cmd[5] = 1;
763 ch_cmd[9] = 255;
FUJITA Tomonori5aa22af2008-01-24 17:24:52 +0900764
Harvey Harrisond70d4662008-03-31 22:05:30 -0700765 result = ch_do_scsi(ch, ch_cmd, buffer, 256, DMA_FROM_DEVICE);
766 if (!result) {
Gerd Knorr daa6eda2005-05-10 10:59:13 +0200767 cge.cge_status = buffer[18];
768 cge.cge_flags = 0;
769 if (buffer[18] & CESTATUS_EXCEPT) {
770 cge.cge_errno = EIO;
771 }
772 if (buffer[25] & 0x80) {
773 cge.cge_flags |= CGE_SRC;
774 if (buffer[25] & 0x40)
775 cge.cge_flags |= CGE_INVERT;
776 elem = (buffer[26]<<8) | buffer[27];
777 for (i = 0; i < 4; i++) {
778 if (elem >= ch->firsts[i] &&
779 elem < ch->firsts[i] + ch->counts[i]) {
780 cge.cge_srctype = i;
781 cge.cge_srcunit = elem-ch->firsts[i];
782 }
783 }
784 }
785 if ((buffer[22] & 0x30) == 0x30) {
786 cge.cge_flags |= CGE_IDLUN;
787 cge.cge_id = buffer[23];
788 cge.cge_lun = buffer[22] & 7;
789 }
790 if (buffer[9] & 0x80) {
791 cge.cge_flags |= CGE_PVOLTAG;
792 memcpy(cge.cge_pvoltag,buffer+28,36);
793 }
794 if (buffer[9] & 0x40) {
795 cge.cge_flags |= CGE_AVOLTAG;
796 memcpy(cge.cge_avoltag,buffer+64,36);
797 }
798 } else if (ch->voltags) {
799 ch->voltags = 0;
Joe Perches87da3232010-08-10 18:01:22 -0700800 VPRINTK(KERN_INFO, "device has no volume tag support\n");
Gerd Knorr daa6eda2005-05-10 10:59:13 +0200801 goto voltag_retry;
802 }
803 kfree(buffer);
Arjan van de Ven0b950672006-01-11 13:16:10 +0100804 mutex_unlock(&ch->lock);
FUJITA Tomonori5aa22af2008-01-24 17:24:52 +0900805
viro@ZenIV.linux.org.ukfe08ac32005-09-09 22:03:44 +0100806 if (copy_to_user(argp, &cge, sizeof (cge)))
Gerd Knorr daa6eda2005-05-10 10:59:13 +0200807 return -EFAULT;
808 return result;
809 }
810
811 case CHIOINITELEM:
812 {
Arjan van de Ven0b950672006-01-11 13:16:10 +0100813 mutex_lock(&ch->lock);
Gerd Knorr daa6eda2005-05-10 10:59:13 +0200814 retval = ch_init_elem(ch);
Arjan van de Ven0b950672006-01-11 13:16:10 +0100815 mutex_unlock(&ch->lock);
Gerd Knorr daa6eda2005-05-10 10:59:13 +0200816 return retval;
817 }
FUJITA Tomonori5aa22af2008-01-24 17:24:52 +0900818
Gerd Knorr daa6eda2005-05-10 10:59:13 +0200819 case CHIOSVOLTAG:
820 {
821 struct changer_set_voltag csv;
822 int elem;
823
viro@ZenIV.linux.org.ukfe08ac32005-09-09 22:03:44 +0100824 if (copy_from_user(&csv, argp, sizeof(csv)))
Gerd Knorr daa6eda2005-05-10 10:59:13 +0200825 return -EFAULT;
826
827 if (0 != ch_checkrange(ch, csv.csv_type, csv.csv_unit)) {
Joe Perches87da3232010-08-10 18:01:22 -0700828 DPRINTK("CHIOSVOLTAG: invalid parameter\n");
Gerd Knorr daa6eda2005-05-10 10:59:13 +0200829 return -EBADSLT;
830 }
831 elem = ch->firsts[csv.csv_type] + csv.csv_unit;
Arjan van de Ven0b950672006-01-11 13:16:10 +0100832 mutex_lock(&ch->lock);
Gerd Knorr daa6eda2005-05-10 10:59:13 +0200833 retval = ch_set_voltag(ch, elem,
834 csv.csv_flags & CSV_AVOLTAG,
835 csv.csv_flags & CSV_CLEARTAG,
836 csv.csv_voltag);
Arjan van de Ven0b950672006-01-11 13:16:10 +0100837 mutex_unlock(&ch->lock);
Gerd Knorr daa6eda2005-05-10 10:59:13 +0200838 return retval;
839 }
840
841 default:
viro@ZenIV.linux.org.ukfe08ac32005-09-09 22:03:44 +0100842 return scsi_ioctl(ch->device, cmd, argp);
Gerd Knorr daa6eda2005-05-10 10:59:13 +0200843
844 }
845}
846
847#ifdef CONFIG_COMPAT
848
849struct changer_element_status32 {
850 int ces_type;
851 compat_uptr_t ces_data;
852};
853#define CHIOGSTATUS32 _IOW('c', 8,struct changer_element_status32)
854
855static long ch_ioctl_compat(struct file * file,
856 unsigned int cmd, unsigned long arg)
857{
858 scsi_changer *ch = file->private_data;
FUJITA Tomonori5aa22af2008-01-24 17:24:52 +0900859
Gerd Knorr daa6eda2005-05-10 10:59:13 +0200860 switch (cmd) {
861 case CHIOGPARAMS:
862 case CHIOGVPARAMS:
863 case CHIOPOSITION:
864 case CHIOMOVE:
865 case CHIOEXCHANGE:
866 case CHIOGELEM:
867 case CHIOINITELEM:
868 case CHIOSVOLTAG:
869 /* compatible */
Mathieu Segaudf7fea182008-01-14 15:43:18 +0100870 return ch_ioctl(file, cmd, arg);
Gerd Knorr daa6eda2005-05-10 10:59:13 +0200871 case CHIOGSTATUS32:
872 {
873 struct changer_element_status32 ces32;
viro@ZenIV.linux.org.ukfe08ac32005-09-09 22:03:44 +0100874 unsigned char __user *data;
FUJITA Tomonori5aa22af2008-01-24 17:24:52 +0900875
viro@ZenIV.linux.org.ukfe08ac32005-09-09 22:03:44 +0100876 if (copy_from_user(&ces32, (void __user *)arg, sizeof (ces32)))
Gerd Knorr daa6eda2005-05-10 10:59:13 +0200877 return -EFAULT;
878 if (ces32.ces_type < 0 || ces32.ces_type >= CH_TYPES)
879 return -EINVAL;
880
881 data = compat_ptr(ces32.ces_data);
882 return ch_gstatus(ch, ces32.ces_type, data);
883 }
884 default:
885 // return scsi_ioctl_compat(ch->device, cmd, (void*)arg);
886 return -ENOIOCTLCMD;
887
888 }
889}
890#endif
891
892/* ------------------------------------------------------------------------ */
893
894static int ch_probe(struct device *dev)
895{
896 struct scsi_device *sd = to_scsi_device(dev);
Tony Jonesee959b02008-02-22 00:13:36 +0100897 struct device *class_dev;
FUJITA Tomonorida707c52008-01-24 17:24:50 +0900898 int minor, ret = -ENOMEM;
Gerd Knorr daa6eda2005-05-10 10:59:13 +0200899 scsi_changer *ch;
FUJITA Tomonoria3d2c2e2008-01-23 23:34:35 +0900900
Gerd Knorr daa6eda2005-05-10 10:59:13 +0200901 if (sd->type != TYPE_MEDIUM_CHANGER)
902 return -ENODEV;
FUJITA Tomonoria3d2c2e2008-01-23 23:34:35 +0900903
vignesh.babu@wipro.com4530a162007-04-16 11:35:33 +0530904 ch = kzalloc(sizeof(*ch), GFP_KERNEL);
Gerd Knorr daa6eda2005-05-10 10:59:13 +0200905 if (NULL == ch)
906 return -ENOMEM;
907
FUJITA Tomonorida707c52008-01-24 17:24:50 +0900908 if (!idr_pre_get(&ch_index_idr, GFP_KERNEL))
909 goto free_ch;
910
911 spin_lock(&ch_index_lock);
912 ret = idr_get_new(&ch_index_idr, ch, &minor);
913 spin_unlock(&ch_index_lock);
914
915 if (ret)
916 goto free_ch;
917
918 if (minor > CH_MAX_DEVS) {
919 ret = -ENODEV;
920 goto remove_idr;
921 }
922
923 ch->minor = minor;
Gerd Knorr daa6eda2005-05-10 10:59:13 +0200924 sprintf(ch->name,"ch%d",ch->minor);
FUJITA Tomonoria3d2c2e2008-01-23 23:34:35 +0900925
Greg Kroah-Hartmand73a1a62008-07-21 20:03:34 -0700926 class_dev = device_create(ch_sysfs_class, dev,
927 MKDEV(SCSI_CHANGER_MAJOR, ch->minor), ch,
928 "s%s", ch->name);
FUJITA Tomonoria3d2c2e2008-01-23 23:34:35 +0900929 if (IS_ERR(class_dev)) {
Tony Jonesee959b02008-02-22 00:13:36 +0100930 printk(KERN_WARNING "ch%d: device_create failed\n",
FUJITA Tomonoria3d2c2e2008-01-23 23:34:35 +0900931 ch->minor);
FUJITA Tomonorida707c52008-01-24 17:24:50 +0900932 ret = PTR_ERR(class_dev);
933 goto remove_idr;
FUJITA Tomonoria3d2c2e2008-01-23 23:34:35 +0900934 }
935
Arjan van de Ven0b950672006-01-11 13:16:10 +0100936 mutex_init(&ch->lock);
Gerd Knorr daa6eda2005-05-10 10:59:13 +0200937 ch->device = sd;
938 ch_readconfig(ch);
939 if (init)
940 ch_init_elem(ch);
941
FUJITA Tomonori3d164fb2008-07-26 23:25:43 +0900942 dev_set_drvdata(dev, ch);
Jeff Garzik017560f2005-10-24 18:04:36 -0400943 sdev_printk(KERN_INFO, sd, "Attached scsi changer %s\n", ch->name);
FUJITA Tomonoria3d2c2e2008-01-23 23:34:35 +0900944
Gerd Knorr daa6eda2005-05-10 10:59:13 +0200945 return 0;
FUJITA Tomonorida707c52008-01-24 17:24:50 +0900946remove_idr:
947 idr_remove(&ch_index_idr, minor);
948free_ch:
949 kfree(ch);
950 return ret;
Gerd Knorr daa6eda2005-05-10 10:59:13 +0200951}
952
953static int ch_remove(struct device *dev)
954{
FUJITA Tomonorida707c52008-01-24 17:24:50 +0900955 scsi_changer *ch = dev_get_drvdata(dev);
Gerd Knorr daa6eda2005-05-10 10:59:13 +0200956
FUJITA Tomonorida707c52008-01-24 17:24:50 +0900957 spin_lock(&ch_index_lock);
958 idr_remove(&ch_index_idr, ch->minor);
959 spin_unlock(&ch_index_lock);
Gerd Knorr daa6eda2005-05-10 10:59:13 +0200960
Tony Jonesee959b02008-02-22 00:13:36 +0100961 device_destroy(ch_sysfs_class, MKDEV(SCSI_CHANGER_MAJOR,ch->minor));
Gerd Knorr daa6eda2005-05-10 10:59:13 +0200962 kfree(ch->dt);
963 kfree(ch);
Gerd Knorr daa6eda2005-05-10 10:59:13 +0200964 return 0;
965}
966
FUJITA Tomonori5aa22af2008-01-24 17:24:52 +0900967static struct scsi_driver ch_template = {
968 .owner = THIS_MODULE,
969 .gendrv = {
970 .name = "ch",
971 .probe = ch_probe,
972 .remove = ch_remove,
973 },
974};
975
976static const struct file_operations changer_fops = {
977 .owner = THIS_MODULE,
978 .open = ch_open,
979 .release = ch_release,
980 .unlocked_ioctl = ch_ioctl,
981#ifdef CONFIG_COMPAT
982 .compat_ioctl = ch_ioctl_compat,
983#endif
984};
985
Gerd Knorr daa6eda2005-05-10 10:59:13 +0200986static int __init init_ch_module(void)
987{
988 int rc;
FUJITA Tomonori5aa22af2008-01-24 17:24:52 +0900989
Gerd Knorr daa6eda2005-05-10 10:59:13 +0200990 printk(KERN_INFO "SCSI Media Changer driver v" VERSION " \n");
Gerd Knorr 21feb5c2005-05-12 10:25:26 +0200991 ch_sysfs_class = class_create(THIS_MODULE, "scsi_changer");
Gerd Knorr daa6eda2005-05-10 10:59:13 +0200992 if (IS_ERR(ch_sysfs_class)) {
993 rc = PTR_ERR(ch_sysfs_class);
994 return rc;
995 }
996 rc = register_chrdev(SCSI_CHANGER_MAJOR,"ch",&changer_fops);
997 if (rc < 0) {
998 printk("Unable to get major %d for SCSI-Changer\n",
999 SCSI_CHANGER_MAJOR);
1000 goto fail1;
1001 }
1002 rc = scsi_register_driver(&ch_template.gendrv);
1003 if (rc < 0)
1004 goto fail2;
1005 return 0;
1006
1007 fail2:
1008 unregister_chrdev(SCSI_CHANGER_MAJOR, "ch");
1009 fail1:
Gerd Knorr 21feb5c2005-05-12 10:25:26 +02001010 class_destroy(ch_sysfs_class);
Gerd Knorr daa6eda2005-05-10 10:59:13 +02001011 return rc;
1012}
1013
FUJITA Tomonori5aa22af2008-01-24 17:24:52 +09001014static void __exit exit_ch_module(void)
Gerd Knorr daa6eda2005-05-10 10:59:13 +02001015{
1016 scsi_unregister_driver(&ch_template.gendrv);
1017 unregister_chrdev(SCSI_CHANGER_MAJOR, "ch");
Gerd Knorr 21feb5c2005-05-12 10:25:26 +02001018 class_destroy(ch_sysfs_class);
FUJITA Tomonorida707c52008-01-24 17:24:50 +09001019 idr_destroy(&ch_index_idr);
Gerd Knorr daa6eda2005-05-10 10:59:13 +02001020}
1021
1022module_init(init_ch_module);
1023module_exit(exit_ch_module);
1024
1025/*
1026 * Local variables:
1027 * c-basic-offset: 8
1028 * End:
1029 */