1 // SPDX-License-Identifier: GPL-2.0
2 /* -*-linux-c-*-
3
4 * vendor-specific code for SCSI CD-ROM's goes here.
5 *
6 * This is needed becauce most of the new features (multisession and
7 * the like) are too new to be included into the SCSI-II standard (to
8 * be exact: there is'nt anything in my draft copy).
9 *
10 * Aug 1997: Ha! Got a SCSI-3 cdrom spec across my fingers. SCSI-3 does
11 * multisession using the READ TOC command (like SONY).
12 *
13 * Rearranged stuff here: SCSI-3 is included allways, support
14 * for NEC/TOSHIBA/HP commands is optional.
15 *
16 * Gerd Knorr <kraxel@cs.tu-berlin.de>
17 *
18 * --------------------------------------------------------------------------
19 *
20 * support for XA/multisession-CD's
21 *
22 * - NEC: Detection and support of multisession CD's.
23 *
24 * - TOSHIBA: Detection and support of multisession CD's.
25 * Some XA-Sector tweaking, required for older drives.
26 *
27 * - SONY: Detection and support of multisession CD's.
28 * added by Thomas Quinot <thomas@cuivre.freenix.fr>
29 *
30 * - PIONEER, HITACHI, PLEXTOR, MATSHITA, TEAC, PHILIPS: known to
31 * work with SONY (SCSI3 now) code.
32 *
33 * - HP: Much like SONY, but a little different... (Thomas)
34 * HP-Writers only ??? Maybe other CD-Writers work with this too ?
35 * HP 6020 writers now supported.
36 */
37
38 #include <linux/cdrom.h>
39 #include <linux/errno.h>
40 #include <linux/string.h>
41 #include <linux/bcd.h>
42 #include <linux/blkdev.h>
43 #include <linux/slab.h>
44
45 #include <scsi/scsi.h>
46 #include <scsi/scsi_cmnd.h>
47 #include <scsi/scsi_device.h>
48 #include <scsi/scsi_host.h>
49 #include <scsi/scsi_ioctl.h>
50
51 #include "sr.h"
52
53 #if 0
54 #define DEBUG
55 #endif
56
57 /* here are some constants to sort the vendors into groups */
58
59 #define VENDOR_SCSI3 1 /* default: scsi-3 mmc */
60
61 #define VENDOR_NEC 2
62 #define VENDOR_TOSHIBA 3
63 #define VENDOR_WRITER 4 /* pre-scsi3 writers */
64
65 #define VENDOR_TIMEOUT 30*HZ
66
sr_vendor_init(Scsi_CD * cd)67 void sr_vendor_init(Scsi_CD *cd)
68 {
69 #ifndef CONFIG_BLK_DEV_SR_VENDOR
70 cd->vendor = VENDOR_SCSI3;
71 #else
72 const char *vendor = cd->device->vendor;
73 const char *model = cd->device->model;
74
75 /* default */
76 cd->vendor = VENDOR_SCSI3;
77 if (cd->readcd_known)
78 /* this is true for scsi3/mmc drives - no more checks */
79 return;
80
81 if (cd->device->type == TYPE_WORM) {
82 cd->vendor = VENDOR_WRITER;
83
84 } else if (!strncmp(vendor, "NEC", 3)) {
85 cd->vendor = VENDOR_NEC;
86 if (!strncmp(model, "CD-ROM DRIVE:25", 15) ||
87 !strncmp(model, "CD-ROM DRIVE:36", 15) ||
88 !strncmp(model, "CD-ROM DRIVE:83", 15) ||
89 !strncmp(model, "CD-ROM DRIVE:84 ", 16)
90 #if 0
91 /* my NEC 3x returns the read-raw data if a read-raw
92 is followed by a read for the same sector - aeb */
93 || !strncmp(model, "CD-ROM DRIVE:500", 16)
94 #endif
95 )
96 /* these can't handle multisession, may hang */
97 cd->cdi.mask |= CDC_MULTI_SESSION;
98
99 } else if (!strncmp(vendor, "TOSHIBA", 7)) {
100 cd->vendor = VENDOR_TOSHIBA;
101
102 }
103 #endif
104 }
105
106
107 /* small handy function for switching block length using MODE SELECT,
108 * used by sr_read_sector() */
109
sr_set_blocklength(Scsi_CD * cd,int blocklength)110 int sr_set_blocklength(Scsi_CD *cd, int blocklength)
111 {
112 unsigned char *buffer; /* the buffer for the ioctl */
113 struct packet_command cgc;
114 struct ccs_modesel_head *modesel;
115 int rc, density = 0;
116
117 #ifdef CONFIG_BLK_DEV_SR_VENDOR
118 if (cd->vendor == VENDOR_TOSHIBA)
119 density = (blocklength > 2048) ? 0x81 : 0x83;
120 #endif
121
122 buffer = kmalloc(512, GFP_KERNEL | GFP_DMA);
123 if (!buffer)
124 return -ENOMEM;
125
126 #ifdef DEBUG
127 sr_printk(KERN_INFO, cd, "MODE SELECT 0x%x/%d\n", density, blocklength);
128 #endif
129 memset(&cgc, 0, sizeof(struct packet_command));
130 cgc.cmd[0] = MODE_SELECT;
131 cgc.cmd[1] = (1 << 4);
132 cgc.cmd[4] = 12;
133 modesel = (struct ccs_modesel_head *) buffer;
134 memset(modesel, 0, sizeof(*modesel));
135 modesel->block_desc_length = 0x08;
136 modesel->density = density;
137 modesel->block_length_med = (blocklength >> 8) & 0xff;
138 modesel->block_length_lo = blocklength & 0xff;
139 cgc.buffer = buffer;
140 cgc.buflen = sizeof(*modesel);
141 cgc.data_direction = DMA_TO_DEVICE;
142 cgc.timeout = VENDOR_TIMEOUT;
143 if (0 == (rc = sr_do_ioctl(cd, &cgc))) {
144 cd->device->sector_size = blocklength;
145 }
146 #ifdef DEBUG
147 else
148 sr_printk(KERN_INFO, cd,
149 "switching blocklength to %d bytes failed\n",
150 blocklength);
151 #endif
152 kfree(buffer);
153 return rc;
154 }
155
156 /* This function gets called after a media change. Checks if the CD is
157 multisession, asks for offset etc. */
158
sr_cd_check(struct cdrom_device_info * cdi)159 int sr_cd_check(struct cdrom_device_info *cdi)
160 {
161 Scsi_CD *cd = cdi->handle;
162 unsigned long sector;
163 unsigned char *buffer; /* the buffer for the ioctl */
164 struct packet_command cgc;
165 int rc, no_multi;
166
167 if (cd->cdi.mask & CDC_MULTI_SESSION)
168 return 0;
169
170 buffer = kmalloc(512, GFP_KERNEL | GFP_DMA);
171 if (!buffer)
172 return -ENOMEM;
173
174 sector = 0; /* the multisession sector offset goes here */
175 no_multi = 0; /* flag: the drive can't handle multisession */
176 rc = 0;
177
178 memset(&cgc, 0, sizeof(struct packet_command));
179
180 switch (cd->vendor) {
181
182 case VENDOR_SCSI3:
183 cgc.cmd[0] = READ_TOC;
184 cgc.cmd[8] = 12;
185 cgc.cmd[9] = 0x40;
186 cgc.buffer = buffer;
187 cgc.buflen = 12;
188 cgc.quiet = 1;
189 cgc.data_direction = DMA_FROM_DEVICE;
190 cgc.timeout = VENDOR_TIMEOUT;
191 rc = sr_do_ioctl(cd, &cgc);
192 if (rc != 0)
193 break;
194 if ((buffer[0] << 8) + buffer[1] < 0x0a) {
195 sr_printk(KERN_INFO, cd, "Hmm, seems the drive "
196 "doesn't support multisession CD's\n");
197 no_multi = 1;
198 break;
199 }
200 sector = buffer[11] + (buffer[10] << 8) +
201 (buffer[9] << 16) + (buffer[8] << 24);
202 if (buffer[6] <= 1) {
203 /* ignore sector offsets from first track */
204 sector = 0;
205 }
206 break;
207
208 #ifdef CONFIG_BLK_DEV_SR_VENDOR
209 case VENDOR_NEC:{
210 unsigned long min, sec, frame;
211 cgc.cmd[0] = 0xde;
212 cgc.cmd[1] = 0x03;
213 cgc.cmd[2] = 0xb0;
214 cgc.buffer = buffer;
215 cgc.buflen = 0x16;
216 cgc.quiet = 1;
217 cgc.data_direction = DMA_FROM_DEVICE;
218 cgc.timeout = VENDOR_TIMEOUT;
219 rc = sr_do_ioctl(cd, &cgc);
220 if (rc != 0)
221 break;
222 if (buffer[14] != 0 && buffer[14] != 0xb0) {
223 sr_printk(KERN_INFO, cd, "Hmm, seems the cdrom "
224 "doesn't support multisession CD's\n");
225
226 no_multi = 1;
227 break;
228 }
229 min = bcd2bin(buffer[15]);
230 sec = bcd2bin(buffer[16]);
231 frame = bcd2bin(buffer[17]);
232 sector = min * CD_SECS * CD_FRAMES + sec * CD_FRAMES + frame;
233 break;
234 }
235
236 case VENDOR_TOSHIBA:{
237 unsigned long min, sec, frame;
238
239 /* we request some disc information (is it a XA-CD ?,
240 * where starts the last session ?) */
241 cgc.cmd[0] = 0xc7;
242 cgc.cmd[1] = 0x03;
243 cgc.buffer = buffer;
244 cgc.buflen = 4;
245 cgc.quiet = 1;
246 cgc.data_direction = DMA_FROM_DEVICE;
247 cgc.timeout = VENDOR_TIMEOUT;
248 rc = sr_do_ioctl(cd, &cgc);
249 if (rc == -EINVAL) {
250 sr_printk(KERN_INFO, cd, "Hmm, seems the drive "
251 "doesn't support multisession CD's\n");
252 no_multi = 1;
253 break;
254 }
255 if (rc != 0)
256 break;
257 min = bcd2bin(buffer[1]);
258 sec = bcd2bin(buffer[2]);
259 frame = bcd2bin(buffer[3]);
260 sector = min * CD_SECS * CD_FRAMES + sec * CD_FRAMES + frame;
261 if (sector)
262 sector -= CD_MSF_OFFSET;
263 sr_set_blocklength(cd, 2048);
264 break;
265 }
266
267 case VENDOR_WRITER:
268 cgc.cmd[0] = READ_TOC;
269 cgc.cmd[8] = 0x04;
270 cgc.cmd[9] = 0x40;
271 cgc.buffer = buffer;
272 cgc.buflen = 0x04;
273 cgc.quiet = 1;
274 cgc.data_direction = DMA_FROM_DEVICE;
275 cgc.timeout = VENDOR_TIMEOUT;
276 rc = sr_do_ioctl(cd, &cgc);
277 if (rc != 0) {
278 break;
279 }
280 if ((rc = buffer[2]) == 0) {
281 sr_printk(KERN_WARNING, cd,
282 "No finished session\n");
283 break;
284 }
285 cgc.cmd[0] = READ_TOC; /* Read TOC */
286 cgc.cmd[6] = rc & 0x7f; /* number of last session */
287 cgc.cmd[8] = 0x0c;
288 cgc.cmd[9] = 0x40;
289 cgc.buffer = buffer;
290 cgc.buflen = 12;
291 cgc.quiet = 1;
292 cgc.data_direction = DMA_FROM_DEVICE;
293 cgc.timeout = VENDOR_TIMEOUT;
294 rc = sr_do_ioctl(cd, &cgc);
295 if (rc != 0) {
296 break;
297 }
298 sector = buffer[11] + (buffer[10] << 8) +
299 (buffer[9] << 16) + (buffer[8] << 24);
300 break;
301 #endif /* CONFIG_BLK_DEV_SR_VENDOR */
302
303 default:
304 /* should not happen */
305 sr_printk(KERN_WARNING, cd,
306 "unknown vendor code (%i), not initialized ?\n",
307 cd->vendor);
308 sector = 0;
309 no_multi = 1;
310 break;
311 }
312 cd->ms_offset = sector;
313 cd->xa_flag = 0;
314 if (CDS_AUDIO != sr_disk_status(cdi) && 1 == sr_is_xa(cd))
315 cd->xa_flag = 1;
316
317 if (2048 != cd->device->sector_size) {
318 sr_set_blocklength(cd, 2048);
319 }
320 if (no_multi)
321 cdi->mask |= CDC_MULTI_SESSION;
322
323 #ifdef DEBUG
324 if (sector)
325 sr_printk(KERN_DEBUG, cd, "multisession offset=%lu\n",
326 sector);
327 #endif
328 kfree(buffer);
329 return rc;
330 }
331
