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