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#define VENDOR_CYGNAL_85ED 5 /* CD-on-a-chip */
65
66#define VENDOR_TIMEOUT 30*HZ
67
68void sr_vendor_init(Scsi_CD *cd)
69{
70 const char *vendor = cd->device->vendor;
71 const char *model = cd->device->model;
72
73 /* default */
74 cd->vendor = VENDOR_SCSI3;
75 if (cd->readcd_known)
76 /* this is true for scsi3/mmc drives - no more checks */
77 return;
78
79 if (cd->device->type == TYPE_WORM) {
80 cd->vendor = VENDOR_WRITER;
81
82 } else if (!strncmp(vendor, "NEC", 3)) {
83 cd->vendor = VENDOR_NEC;
84 if (!strncmp(model, "CD-ROM DRIVE:25", 15) ||
85 !strncmp(model, "CD-ROM DRIVE:36", 15) ||
86 !strncmp(model, "CD-ROM DRIVE:83", 15) ||
87 !strncmp(model, "CD-ROM DRIVE:84 ", 16)
88#if 0
89 /* my NEC 3x returns the read-raw data if a read-raw
90 is followed by a read for the same sector - aeb */
91 || !strncmp(model, "CD-ROM DRIVE:500", 16)
92#endif
93 )
94 /* these can't handle multisession, may hang */
95 cd->cdi.mask |= CDC_MULTI_SESSION;
96
97 } else if (!strncmp(vendor, "TOSHIBA", 7)) {
98 cd->vendor = VENDOR_TOSHIBA;
99
100 } else if (!strncmp(vendor, "Beurer", 6) &&
101 !strncmp(model, "Gluco Memory", 12)) {
102 /* The Beurer GL50 evo uses a Cygnal-manufactured CD-on-a-chip
103 that only accepts a subset of SCSI commands. Most of the
104 not-implemented commands are fine to fail, but a few,
105 particularly around the MMC or Audio commands, will put the
106 device into an unrecoverable state, so they need to be
107 avoided at all costs.
108 */
109 cd->vendor = VENDOR_CYGNAL_85ED;
110 cd->cdi.mask |= (
111 CDC_MULTI_SESSION |
112 CDC_CLOSE_TRAY | CDC_OPEN_TRAY |
113 CDC_LOCK |
114 CDC_GENERIC_PACKET |
115 CDC_PLAY_AUDIO
116 );
117 }
118}
119
120
121/* small handy function for switching block length using MODE SELECT,
122 * used by sr_read_sector() */
123
124int sr_set_blocklength(Scsi_CD *cd, int blocklength)
125{
126 unsigned char *buffer; /* the buffer for the ioctl */
127 struct packet_command cgc;
128 struct ccs_modesel_head *modesel;
129 int rc, density = 0;
130
131 if (cd->vendor == VENDOR_TOSHIBA)
132 density = (blocklength > 2048) ? 0x81 : 0x83;
133
134 buffer = kmalloc(512, GFP_KERNEL);
135 if (!buffer)
136 return -ENOMEM;
137
138#ifdef DEBUG
139 sr_printk(KERN_INFO, cd, "MODE SELECT 0x%x/%d\n", density, blocklength);
140#endif
141 memset(s: &cgc, c: 0, n: sizeof(struct packet_command));
142 cgc.cmd[0] = MODE_SELECT;
143 cgc.cmd[1] = (1 << 4);
144 cgc.cmd[4] = 12;
145 modesel = (struct ccs_modesel_head *) buffer;
146 memset(s: modesel, c: 0, n: sizeof(*modesel));
147 modesel->block_desc_length = 0x08;
148 modesel->density = density;
149 modesel->block_length_med = (blocklength >> 8) & 0xff;
150 modesel->block_length_lo = blocklength & 0xff;
151 cgc.buffer = buffer;
152 cgc.buflen = sizeof(*modesel);
153 cgc.data_direction = DMA_TO_DEVICE;
154 cgc.timeout = VENDOR_TIMEOUT;
155 if (0 == (rc = sr_do_ioctl(cd, &cgc))) {
156 cd->device->sector_size = blocklength;
157 }
158#ifdef DEBUG
159 else
160 sr_printk(KERN_INFO, cd,
161 "switching blocklength to %d bytes failed\n",
162 blocklength);
163#endif
164 kfree(objp: buffer);
165 return rc;
166}
167
168/* This function gets called after a media change. Checks if the CD is
169 multisession, asks for offset etc. */
170
171int sr_cd_check(struct cdrom_device_info *cdi)
172{
173 Scsi_CD *cd = cdi->handle;
174 unsigned long sector;
175 unsigned char *buffer; /* the buffer for the ioctl */
176 struct packet_command cgc;
177 int rc, no_multi;
178
179 if (cd->cdi.mask & CDC_MULTI_SESSION)
180 return 0;
181
182 buffer = kmalloc(512, GFP_KERNEL);
183 if (!buffer)
184 return -ENOMEM;
185
186 sector = 0; /* the multisession sector offset goes here */
187 no_multi = 0; /* flag: the drive can't handle multisession */
188 rc = 0;
189
190 memset(s: &cgc, c: 0, n: sizeof(struct packet_command));
191
192 switch (cd->vendor) {
193
194 case VENDOR_SCSI3:
195 cgc.cmd[0] = READ_TOC;
196 cgc.cmd[8] = 12;
197 cgc.cmd[9] = 0x40;
198 cgc.buffer = buffer;
199 cgc.buflen = 12;
200 cgc.quiet = 1;
201 cgc.data_direction = DMA_FROM_DEVICE;
202 cgc.timeout = VENDOR_TIMEOUT;
203 rc = sr_do_ioctl(cd, &cgc);
204 if (rc != 0)
205 break;
206 if ((buffer[0] << 8) + buffer[1] < 0x0a) {
207 sr_printk(KERN_INFO, cd, "Hmm, seems the drive "
208 "doesn't support multisession CD's\n");
209 no_multi = 1;
210 break;
211 }
212 sector = buffer[11] + (buffer[10] << 8) +
213 (buffer[9] << 16) + (buffer[8] << 24);
214 if (buffer[6] <= 1) {
215 /* ignore sector offsets from first track */
216 sector = 0;
217 }
218 break;
219
220 case VENDOR_NEC:{
221 unsigned long min, sec, frame;
222 cgc.cmd[0] = 0xde;
223 cgc.cmd[1] = 0x03;
224 cgc.cmd[2] = 0xb0;
225 cgc.buffer = buffer;
226 cgc.buflen = 0x16;
227 cgc.quiet = 1;
228 cgc.data_direction = DMA_FROM_DEVICE;
229 cgc.timeout = VENDOR_TIMEOUT;
230 rc = sr_do_ioctl(cd, &cgc);
231 if (rc != 0)
232 break;
233 if (buffer[14] != 0 && buffer[14] != 0xb0) {
234 sr_printk(KERN_INFO, cd, "Hmm, seems the cdrom "
235 "doesn't support multisession CD's\n");
236
237 no_multi = 1;
238 break;
239 }
240 min = bcd2bin(buffer[15]);
241 sec = bcd2bin(buffer[16]);
242 frame = bcd2bin(buffer[17]);
243 sector = min * CD_SECS * CD_FRAMES + sec * CD_FRAMES + frame;
244 break;
245 }
246
247 case VENDOR_TOSHIBA:{
248 unsigned long min, sec, frame;
249
250 /* we request some disc information (is it a XA-CD ?,
251 * where starts the last session ?) */
252 cgc.cmd[0] = 0xc7;
253 cgc.cmd[1] = 0x03;
254 cgc.buffer = buffer;
255 cgc.buflen = 4;
256 cgc.quiet = 1;
257 cgc.data_direction = DMA_FROM_DEVICE;
258 cgc.timeout = VENDOR_TIMEOUT;
259 rc = sr_do_ioctl(cd, &cgc);
260 if (rc == -EINVAL) {
261 sr_printk(KERN_INFO, cd, "Hmm, seems the drive "
262 "doesn't support multisession CD's\n");
263 no_multi = 1;
264 break;
265 }
266 if (rc != 0)
267 break;
268 min = bcd2bin(buffer[1]);
269 sec = bcd2bin(buffer[2]);
270 frame = bcd2bin(buffer[3]);
271 sector = min * CD_SECS * CD_FRAMES + sec * CD_FRAMES + frame;
272 if (sector)
273 sector -= CD_MSF_OFFSET;
274 sr_set_blocklength(cd, blocklength: 2048);
275 break;
276 }
277
278 case VENDOR_WRITER:
279 cgc.cmd[0] = READ_TOC;
280 cgc.cmd[8] = 0x04;
281 cgc.cmd[9] = 0x40;
282 cgc.buffer = buffer;
283 cgc.buflen = 0x04;
284 cgc.quiet = 1;
285 cgc.data_direction = DMA_FROM_DEVICE;
286 cgc.timeout = VENDOR_TIMEOUT;
287 rc = sr_do_ioctl(cd, &cgc);
288 if (rc != 0) {
289 break;
290 }
291 if ((rc = buffer[2]) == 0) {
292 sr_printk(KERN_WARNING, cd,
293 "No finished session\n");
294 break;
295 }
296 cgc.cmd[0] = READ_TOC; /* Read TOC */
297 cgc.cmd[6] = rc & 0x7f; /* number of last session */
298 cgc.cmd[8] = 0x0c;
299 cgc.cmd[9] = 0x40;
300 cgc.buffer = buffer;
301 cgc.buflen = 12;
302 cgc.quiet = 1;
303 cgc.data_direction = DMA_FROM_DEVICE;
304 cgc.timeout = VENDOR_TIMEOUT;
305 rc = sr_do_ioctl(cd, &cgc);
306 if (rc != 0) {
307 break;
308 }
309 sector = buffer[11] + (buffer[10] << 8) +
310 (buffer[9] << 16) + (buffer[8] << 24);
311 break;
312
313 default:
314 /* should not happen */
315 sr_printk(KERN_WARNING, cd,
316 "unknown vendor code (%i), not initialized ?\n",
317 cd->vendor);
318 sector = 0;
319 no_multi = 1;
320 break;
321 }
322 cd->ms_offset = sector;
323 cd->xa_flag = 0;
324 if (CDS_AUDIO != sr_disk_status(cdi) && 1 == sr_is_xa(cd))
325 cd->xa_flag = 1;
326
327 if (2048 != cd->device->sector_size) {
328 sr_set_blocklength(cd, blocklength: 2048);
329 }
330 if (no_multi)
331 cdi->mask |= CDC_MULTI_SESSION;
332
333#ifdef DEBUG
334 if (sector)
335 sr_printk(KERN_DEBUG, cd, "multisession offset=%lu\n",
336 sector);
337#endif
338 kfree(objp: buffer);
339 return rc;
340}
341