GNU Linux-libre 5.19-rc6-gnu
[releases.git] / drivers / scsi / sr_vendor.c
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
68 void 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
124 int 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(&cgc, 0, 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(modesel, 0, 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(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
171 int 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(&cgc, 0, 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, 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, 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(buffer);
339         return rc;
340 }