lxdream 0.9.1| filename | src/drivers/cd_linux.c |
| changeset | 678:35eb00945316 |
| prev | 644:ccae4bfa5f82 |
| next | 709:18c39a8e504c |
| author | nkeynes |
| date | Thu May 29 11:00:26 2008 +0000 (15 years ago) |
| permissions | -rw-r--r-- |
| last change | Split gdrom.h into public and private gddriver.h Reorganize gdrom mount to use a disc change hook |
| view | annotate | diff | log | raw |
1 /**
2 * $Id$
3 *
4 * Linux cd-rom device driver.
5 *
6 * Copyright (c) 2005 Nathan Keynes.
7 *
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License as published by
10 * the Free Software Foundation; either version 2 of the License, or
11 * (at your option) any later version.
12 *
13 * This program is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 * GNU General Public License for more details.
17 */
18 #include <unistd.h>
19 #include <stdlib.h>
20 #include <stdio.h>
21 #include <string.h>
22 #include <errno.h>
23 #include <linux/cdrom.h>
24 #include <sys/stat.h>
25 #include <sys/ioctl.h>
26 #include <fstab.h>
27 #include <fcntl.h>
29 #include "gdrom/gddriver.h"
30 #include "gdrom/packet.h"
31 #include "dream.h"
33 #define MAXTOCENTRIES 600 /* This is a fairly generous overestimate really */
34 #define MAXTOCSIZE 4 + (MAXTOCENTRIES*11)
35 #define MAX_SECTORS_PER_CALL 1
37 #define MSFTOLBA( m,s,f ) (f + (s*CD_FRAMES) + (m*CD_FRAMES*CD_SECS))
39 static uint32_t inline lbatomsf( uint32_t lba ) {
40 union cdrom_addr addr;
41 lba = lba + CD_MSF_OFFSET;
42 addr.msf.frame = lba % CD_FRAMES;
43 int seconds = lba / CD_FRAMES;
44 addr.msf.second = seconds % CD_SECS;
45 addr.msf.minute = seconds / CD_SECS;
46 return addr.lba;
47 }
49 #define LBATOMSF( lba ) lbatomsf(lba)
52 static gboolean linux_image_is_valid( FILE *f );
53 static gdrom_disc_t linux_open_device( const gchar *filename, FILE *f );
54 static gdrom_error_t linux_read_disc_toc( gdrom_image_t disc );
55 static gdrom_error_t linux_read_sector( gdrom_disc_t disc, uint32_t sector,
56 int mode, unsigned char *buf, uint32_t *length );
57 static gdrom_error_t linux_send_command( int fd, char *cmd, unsigned char *buffer, size_t *buflen,
58 int direction );
59 static int linux_drive_status( gdrom_disc_t disc );
61 struct gdrom_image_class cdrom_device_class = { "Linux", NULL,
62 linux_image_is_valid, linux_open_device };
63 GList *gdrom_get_native_devices(void)
64 {
65 GList *list = NULL;
66 struct fstab *ent;
67 struct stat st;
68 setfsent();
69 while( (ent = getfsent()) != NULL ) {
70 if( (stat(ent->fs_spec, &st) != -1) &&
71 S_ISBLK(st.st_mode) ) {
72 /* Got a valid block device - is it a CDROM? */
73 int fd = open(ent->fs_spec, O_RDONLY|O_NONBLOCK);
74 if( fd == -1 )
75 continue;
76 int caps = ioctl(fd, CDROM_GET_CAPABILITY);
77 if( caps != -1 ) {
78 /* Appears to support CDROM functions */
79 list = g_list_append( list, g_strdup(ent->fs_spec) );
80 }
81 close(fd);
82 }
83 }
84 return list;
85 }
87 static gboolean linux_image_is_valid( FILE *f )
88 {
89 struct stat st;
90 struct cdrom_tochdr tochdr;
92 if( fstat(fileno(f), &st) == -1 ) {
93 return FALSE; /* can't stat device? */
94 }
95 if( !S_ISBLK(st.st_mode) ) {
96 return FALSE; /* Not a block device */
97 }
99 if( ioctl(fileno(f), CDROMREADTOCHDR, &tochdr) == -1 ) {
100 /* Quick check that this is really a CD */
101 return FALSE;
102 }
104 return TRUE;
105 }
107 static gdrom_disc_t linux_open_device( const gchar *filename, FILE *f )
108 {
109 gdrom_disc_t disc;
111 disc = gdrom_image_new(filename, f);
112 if( disc == NULL ) {
113 ERROR("Unable to allocate memory!");
114 return NULL;
115 }
117 gdrom_error_t status = linux_read_disc_toc( (gdrom_image_t)disc );
118 if( status != 0 ) {
119 gdrom_image_destroy_no_close(disc);
120 if( status == 0xFFFF ) {
121 ERROR("Unable to load disc table of contents (%s)", strerror(errno));
122 } else {
123 ERROR("Unable to load disc table of contents (sense %d,%d)",
124 status &0xFF, status >> 8 );
125 }
126 return NULL;
127 }
128 disc->read_sector = linux_read_sector;
129 disc->drive_status = linux_drive_status;
130 return disc;
131 }
133 static int linux_drive_status( gdrom_disc_t disc )
134 {
135 int fd = fileno(((gdrom_image_t)disc)->file);
136 int status = ioctl(fd, CDROM_DRIVE_STATUS, CDSL_CURRENT);
137 if( status == CDS_DISC_OK ) {
138 status = ioctl(fd, CDROM_MEDIA_CHANGED, CDSL_CURRENT);
139 if( status != 0 ) {
140 linux_read_disc_toc( (gdrom_image_t)disc);
141 }
142 return ((gdrom_image_t)disc)->disc_type | IDE_DISC_READY;
143 } else {
144 return IDE_DISC_NONE;
145 }
146 }
147 /**
148 * Read the full table of contents into the disc from the device.
149 */
150 static gdrom_error_t linux_read_disc_toc( gdrom_image_t disc )
151 {
152 int fd = fileno(disc->file);
153 unsigned char buf[MAXTOCSIZE];
154 size_t buflen = sizeof(buf);
155 char cmd[12] = { 0x43, 0, 2, 0, 0, 0, 0, 0, 0, 0, 0, 0 };
157 cmd[7] = (sizeof(buf))>>8;
158 cmd[8] = (sizeof(buf))&0xFF;
159 memset( buf, 0, sizeof(buf) );
160 gdrom_error_t status = linux_send_command( fd, cmd, buf, &buflen, CGC_DATA_READ );
161 if( status != 0 ) {
162 return status;
163 }
165 int max_track = 0;
166 int last_track = -1;
167 int leadout = -1;
168 int len = (buf[0] << 8) | buf[1];
169 int session_type = -1;
170 int i;
171 for( i = 4; i<len; i+=11 ) {
172 int session = buf[i];
173 int adr = buf[i+1] >> 4;
174 int point = buf[i+3];
175 if( adr == 0x01 && point > 0 && point < 100 ) {
176 /* Track info */
177 int trackno = point-1;
178 if( point > max_track ) {
179 max_track = point;
180 }
181 disc->track[trackno].flags = (buf[i+1] & 0x0F) << 4;
182 disc->track[trackno].session = session - 1;
183 disc->track[trackno].lba = MSFTOLBA(buf[i+8],buf[i+9],buf[i+10]);
184 if( disc->track[trackno].flags & TRACK_DATA ) {
185 disc->track[trackno].mode = GDROM_MODE1;
186 } else {
187 disc->track[trackno].mode = GDROM_CDDA;
188 }
189 if( last_track != -1 ) {
190 disc->track[last_track].sector_count = disc->track[trackno].lba -
191 disc->track[last_track].lba;
192 }
193 last_track = trackno;
194 } else switch( (adr << 8) | point ) {
195 case 0x1A0: /* session info */
196 if( buf[i+9] == 0x20 ) {
197 session_type = IDE_DISC_CDROMXA;
198 } else {
199 session_type = IDE_DISC_CDROM;
200 }
201 disc->disc_type = session_type;
202 break;
203 case 0x1A2: /* leadout */
204 leadout = MSFTOLBA(buf[i+8], buf[i+9], buf[i+10]);
205 break;
206 }
207 }
208 disc->track_count = max_track;
210 if( leadout != -1 && last_track != -1 ) {
211 disc->track[last_track].sector_count = leadout - disc->track[last_track].lba;
212 }
213 return 0;
214 }
216 gdrom_error_t linux_play_audio( gdrom_disc_t disc, uint32_t lba, uint32_t endlba )
217 {
218 int fd = fileno( ((gdrom_image_t)disc)->file );
219 uint32_t real_sector = lba - CD_MSF_OFFSET;
220 uint32_t length = endlba - lba;
221 uint32_t buflen = 0;
222 char cmd[12] = { 0xA5, 0,0,0, 0,0,0,0, 0,0,0,0 };
223 cmd[2] = (real_sector >> 24) & 0xFF;
224 cmd[3] = (real_sector >> 16) & 0xFF;
225 cmd[4] = (real_sector >> 8) & 0xFF;
226 cmd[5] = real_sector & 0xFF;
227 cmd[6] = (length >> 24) & 0xFF;
228 cmd[7] = (length >> 16) & 0xFF;
229 cmd[8] = (length >> 8) & 0xFF;
230 cmd[9] = length & 0xFF;
232 return linux_send_command( fd, cmd, NULL, &buflen, CGC_DATA_NONE );
233 }
235 gdrom_error_t linux_stop_audio( gdrom_disc_t disc )
236 {
237 int fd = fileno( ((gdrom_image_t)disc)->file );
238 uint32_t buflen = 0;
239 char cmd[12] = {0x4E,0,0,0, 0,0,0,0, 0,0,0,0};
240 return linux_send_command( fd, cmd, NULL, &buflen, CGC_DATA_NONE );
241 }
243 static gdrom_error_t linux_read_sector( gdrom_disc_t disc, uint32_t sector,
244 int mode, unsigned char *buf, uint32_t *length )
245 {
246 gdrom_image_t image = (gdrom_image_t)disc;
247 int fd = fileno(image->file);
248 uint32_t real_sector = sector - CD_MSF_OFFSET;
249 uint32_t sector_size = MAX_SECTOR_SIZE;
250 char cmd[12] = { 0xBE, 0x10, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 };
252 cmd[1] = (mode & 0x0E) << 1;
253 cmd[2] = (real_sector >> 24) & 0xFF;
254 cmd[3] = (real_sector >> 16) & 0xFF;
255 cmd[4] = (real_sector >> 8) & 0xFF;
256 cmd[5] = real_sector & 0xFF;
257 cmd[6] = 0;
258 cmd[7] = 0;
259 cmd[8] = 1;
261 if( READ_CD_RAW(mode) ) {
262 cmd[9] = 0xF0;
263 } else {
264 if( READ_CD_HEADER(mode) ) {
265 cmd[9] = 0xA0;
266 }
267 if( READ_CD_SUBHEAD(mode) ) {
268 cmd[9] |= 0x40;
269 }
270 if( READ_CD_DATA(mode) ) {
271 cmd[9] |= 0x10;
272 }
273 }
275 gdrom_error_t status = linux_send_command( fd, cmd, buf, §or_size, CGC_DATA_READ );
276 if( status != 0 ) {
277 return status;
278 }
279 *length = 2048;
280 return 0;
281 }
283 /**
284 * Send a packet command to the device and wait for a response.
285 * @return 0 on success, -1 on an operating system error, or a sense error
286 * code on a device error.
287 */
288 static gdrom_error_t linux_send_command( int fd, char *cmd, unsigned char *buffer, size_t *buflen,
289 int direction )
290 {
291 struct request_sense sense;
292 struct cdrom_generic_command cgc;
294 memset( &cgc, 0, sizeof(cgc) );
295 memset( &sense, 0, sizeof(sense) );
296 memcpy( cgc.cmd, cmd, 12 );
297 cgc.buffer = buffer;
298 cgc.buflen = *buflen;
299 cgc.sense = &sense;
300 cgc.data_direction = direction;
302 if( ioctl(fd, CDROM_SEND_PACKET, &cgc) < 0 ) {
303 if( sense.sense_key == 0 ) {
304 return -1;
305 } else {
306 /* TODO: Map newer codes back to the ones used by the gd-rom. */
307 return sense.sense_key | (sense.asc<<8);
308 }
309 } else {
310 *buflen = cgc.buflen;
311 return 0;
312 }
313 }
.