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(&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
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(&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}
341