[PATCH] shmat: stop mprotect from giving write permission to a readonly attachment...
[linux-2.6.git] / sound / drivers / opl3 / opl3_oss.c
1 /*
2  *  Interface for OSS sequencer emulation
3  *
4  *  Copyright (C) 2000 Uros Bizjak <uros@kss-loka.si>
5  *
6  *   This program is free software; you can redistribute it and/or modify
7  *   it under the terms of the GNU General Public License as published by
8  *   the Free Software Foundation; either version 2 of the License, or
9  *   (at your option) any later version.
10  *
11  *   This program is distributed in the hope that it will be useful,
12  *   but WITHOUT ANY WARRANTY; without even the implied warranty of
13  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
14  *   GNU General Public License for more details.
15  *
16  *   You should have received a copy of the GNU General Public License
17  *   along with this program; if not, write to the Free Software
18  *   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA
19  */
20
21 #include "opl3_voice.h"
22 #include <linux/slab.h>
23
24 static int snd_opl3_open_seq_oss(struct snd_seq_oss_arg *arg, void *closure);
25 static int snd_opl3_close_seq_oss(struct snd_seq_oss_arg *arg);
26 static int snd_opl3_ioctl_seq_oss(struct snd_seq_oss_arg *arg, unsigned int cmd, unsigned long ioarg);
27 static int snd_opl3_load_patch_seq_oss(struct snd_seq_oss_arg *arg, int format, const char __user *buf, int offs, int count);
28 static int snd_opl3_reset_seq_oss(struct snd_seq_oss_arg *arg);
29
30 /* */
31
32 static inline mm_segment_t snd_enter_user(void)
33 {
34         mm_segment_t fs = get_fs();
35         set_fs(get_ds());
36         return fs;
37 }
38
39 static inline void snd_leave_user(mm_segment_t fs)
40 {
41         set_fs(fs);
42 }
43
44 /* operators */
45
46 extern struct snd_midi_op opl3_ops;
47
48 static struct snd_seq_oss_callback oss_callback = {
49         .owner =        THIS_MODULE,
50         .open =         snd_opl3_open_seq_oss,
51         .close =        snd_opl3_close_seq_oss,
52         .ioctl =        snd_opl3_ioctl_seq_oss,
53         .load_patch =   snd_opl3_load_patch_seq_oss,
54         .reset =        snd_opl3_reset_seq_oss,
55 };
56
57 static int snd_opl3_oss_event_input(struct snd_seq_event *ev, int direct,
58                                     void *private_data, int atomic, int hop)
59 {
60         struct snd_opl3 *opl3 = private_data;
61
62         if (ev->type != SNDRV_SEQ_EVENT_OSS)
63                 snd_midi_process_event(&opl3_ops, ev, opl3->oss_chset);
64         return 0;
65 }
66
67 /* ------------------------------ */
68
69 static void snd_opl3_oss_free_port(void *private_data)
70 {
71         struct snd_opl3 *opl3 = private_data;
72
73         snd_midi_channel_free_set(opl3->oss_chset);
74 }
75
76 static int snd_opl3_oss_create_port(struct snd_opl3 * opl3)
77 {
78         struct snd_seq_port_callback callbacks;
79         char name[32];
80         int voices, opl_ver;
81
82         voices = (opl3->hardware < OPL3_HW_OPL3) ?
83                 MAX_OPL2_VOICES : MAX_OPL3_VOICES;
84         opl3->oss_chset = snd_midi_channel_alloc_set(voices);
85         if (opl3->oss_chset == NULL)
86                 return -ENOMEM;
87         opl3->oss_chset->private_data = opl3;
88
89         memset(&callbacks, 0, sizeof(callbacks));
90         callbacks.owner = THIS_MODULE;
91         callbacks.event_input = snd_opl3_oss_event_input;
92         callbacks.private_free = snd_opl3_oss_free_port;
93         callbacks.private_data = opl3;
94
95         opl_ver = (opl3->hardware & OPL3_HW_MASK) >> 8;
96         sprintf(name, "OPL%i OSS Port", opl_ver);
97
98         opl3->oss_chset->client = opl3->seq_client;
99         opl3->oss_chset->port = snd_seq_event_port_attach(opl3->seq_client, &callbacks,
100                                                           SNDRV_SEQ_PORT_CAP_WRITE,
101                                                           SNDRV_SEQ_PORT_TYPE_MIDI_GENERIC |
102                                                           SNDRV_SEQ_PORT_TYPE_MIDI_GM |
103                                                           SNDRV_SEQ_PORT_TYPE_SYNTH,
104                                                           voices, voices,
105                                                           name);
106         if (opl3->oss_chset->port < 0) {
107                 int port;
108                 port = opl3->oss_chset->port;
109                 snd_midi_channel_free_set(opl3->oss_chset);
110                 return port;
111         }
112         return 0;
113 }
114
115 /* ------------------------------ */
116
117 /* register OSS synth */
118 void snd_opl3_init_seq_oss(struct snd_opl3 *opl3, char *name)
119 {
120         struct snd_seq_oss_reg *arg;
121         struct snd_seq_device *dev;
122
123         if (snd_seq_device_new(opl3->card, 0, SNDRV_SEQ_DEV_ID_OSS,
124                                sizeof(struct snd_seq_oss_reg), &dev) < 0)
125                 return;
126
127         opl3->oss_seq_dev = dev;
128         strlcpy(dev->name, name, sizeof(dev->name));
129         arg = SNDRV_SEQ_DEVICE_ARGPTR(dev);
130         arg->type = SYNTH_TYPE_FM;
131         if (opl3->hardware < OPL3_HW_OPL3) {
132                 arg->subtype = FM_TYPE_ADLIB;
133                 arg->nvoices = MAX_OPL2_VOICES;
134         } else {
135                 arg->subtype = FM_TYPE_OPL3;
136                 arg->nvoices = MAX_OPL3_VOICES;
137         }
138         arg->oper = oss_callback;
139         arg->private_data = opl3;
140
141         if (snd_opl3_oss_create_port(opl3)) {
142                 /* register to OSS synth table */
143                 snd_device_register(opl3->card, dev);
144         }
145 }
146
147 /* unregister */
148 void snd_opl3_free_seq_oss(struct snd_opl3 *opl3)
149 {
150         if (opl3->oss_seq_dev) {
151                 /* The instance should have been released in prior */
152                 opl3->oss_seq_dev = NULL;
153         }
154 }
155
156 /* ------------------------------ */
157
158 /* open OSS sequencer */
159 static int snd_opl3_open_seq_oss(struct snd_seq_oss_arg *arg, void *closure)
160 {
161         struct snd_opl3 *opl3 = closure;
162         int err;
163
164         snd_assert(arg != NULL, return -ENXIO);
165
166         if ((err = snd_opl3_synth_setup(opl3)) < 0)
167                 return err;
168
169         /* fill the argument data */
170         arg->private_data = opl3;
171         arg->addr.client = opl3->oss_chset->client;
172         arg->addr.port = opl3->oss_chset->port;
173
174         if ((err = snd_opl3_synth_use_inc(opl3)) < 0)
175                 return err;
176
177         opl3->synth_mode = SNDRV_OPL3_MODE_SYNTH;
178         return 0;
179 }
180
181 /* close OSS sequencer */
182 static int snd_opl3_close_seq_oss(struct snd_seq_oss_arg *arg)
183 {
184         struct snd_opl3 *opl3;
185
186         snd_assert(arg != NULL, return -ENXIO);
187         opl3 = arg->private_data;
188
189         snd_opl3_synth_cleanup(opl3);
190
191         snd_opl3_synth_use_dec(opl3);
192         return 0;
193 }
194
195 /* load patch */
196
197 /* offsets for SBI params */
198 #define AM_VIB          0
199 #define KSL_LEVEL       2
200 #define ATTACK_DECAY    4
201 #define SUSTAIN_RELEASE 6
202 #define WAVE_SELECT     8
203
204 /* offset for SBI instrument */
205 #define CONNECTION      10
206 #define OFFSET_4OP      11
207
208 /* from sound_config.h */
209 #define SBFM_MAXINSTR   256
210
211 static int snd_opl3_load_patch_seq_oss(struct snd_seq_oss_arg *arg, int format,
212                                        const char __user *buf, int offs, int count)
213 {
214         struct snd_opl3 *opl3;
215         int err = -EINVAL;
216
217         snd_assert(arg != NULL, return -ENXIO);
218         opl3 = arg->private_data;
219
220         if ((format == FM_PATCH) || (format == OPL3_PATCH)) {
221                 struct sbi_instrument sbi;
222
223                 size_t size;
224                 struct snd_seq_instr_header *put;
225                 struct snd_seq_instr_data *data;
226                 struct fm_xinstrument *xinstr;
227
228                 struct snd_seq_event ev;
229                 int i;
230
231                 mm_segment_t fs;
232
233                 if (count < (int)sizeof(sbi)) {
234                         snd_printk("FM Error: Patch record too short\n");
235                         return -EINVAL;
236                 }
237                 if (copy_from_user(&sbi, buf, sizeof(sbi)))
238                         return -EFAULT;
239
240                 if (sbi.channel < 0 || sbi.channel >= SBFM_MAXINSTR) {
241                         snd_printk("FM Error: Invalid instrument number %d\n", sbi.channel);
242                         return -EINVAL;
243                 }
244
245                 size = sizeof(*put) + sizeof(struct fm_xinstrument);
246                 put = kzalloc(size, GFP_KERNEL);
247                 if (put == NULL)
248                         return -ENOMEM;
249                 /* build header */
250                 data = &put->data;
251                 data->type = SNDRV_SEQ_INSTR_ATYPE_DATA;
252                 strcpy(data->data.format, SNDRV_SEQ_INSTR_ID_OPL2_3);
253                 /* build data section */
254                 xinstr = (struct fm_xinstrument *)(data + 1);
255                 xinstr->stype = FM_STRU_INSTR;
256         
257                 for (i = 0; i < 2; i++) {
258                         xinstr->op[i].am_vib = sbi.operators[AM_VIB + i];
259                         xinstr->op[i].ksl_level = sbi.operators[KSL_LEVEL + i];
260                         xinstr->op[i].attack_decay = sbi.operators[ATTACK_DECAY + i];
261                         xinstr->op[i].sustain_release = sbi.operators[SUSTAIN_RELEASE + i];
262                         xinstr->op[i].wave_select = sbi.operators[WAVE_SELECT + i];
263                 }
264                 xinstr->feedback_connection[0] = sbi.operators[CONNECTION];
265
266                 if (format == OPL3_PATCH) {
267                         xinstr->type = FM_PATCH_OPL3;
268                         for (i = 0; i < 2; i++) {
269                                 xinstr->op[i+2].am_vib = sbi.operators[OFFSET_4OP + AM_VIB + i];
270                                 xinstr->op[i+2].ksl_level = sbi.operators[OFFSET_4OP + KSL_LEVEL + i];
271                                 xinstr->op[i+2].attack_decay = sbi.operators[OFFSET_4OP + ATTACK_DECAY + i];
272                                 xinstr->op[i+2].sustain_release = sbi.operators[OFFSET_4OP + SUSTAIN_RELEASE + i];
273                                 xinstr->op[i+2].wave_select = sbi.operators[OFFSET_4OP + WAVE_SELECT + i];
274                         }
275                         xinstr->feedback_connection[1] = sbi.operators[OFFSET_4OP + CONNECTION];
276                 } else {
277                         xinstr->type = FM_PATCH_OPL2;
278                 }
279
280                 put->id.instr.std = SNDRV_SEQ_INSTR_TYPE2_OPL2_3;
281                 put->id.instr.bank = 127;
282                 put->id.instr.prg = sbi.channel;
283                 put->cmd = SNDRV_SEQ_INSTR_PUT_CMD_CREATE;
284
285                 memset (&ev, 0, sizeof(ev));
286                 ev.source.client = SNDRV_SEQ_CLIENT_OSS;
287                 ev.dest = arg->addr; 
288
289                 ev.flags = SNDRV_SEQ_EVENT_LENGTH_VARUSR;
290                 ev.queue = SNDRV_SEQ_QUEUE_DIRECT;
291
292                 fs = snd_enter_user();
293         __again:
294                 ev.type = SNDRV_SEQ_EVENT_INSTR_PUT;
295                 ev.data.ext.len = size;
296                 ev.data.ext.ptr = put;
297
298                 err = snd_seq_instr_event(&opl3->fm_ops, opl3->ilist, &ev,
299                                     opl3->seq_client, 0, 0);
300                 if (err == -EBUSY) {
301                         struct snd_seq_instr_header remove;
302
303                         memset (&remove, 0, sizeof(remove));
304                         remove.cmd = SNDRV_SEQ_INSTR_FREE_CMD_SINGLE;
305                         remove.id.instr = put->id.instr;
306
307                         /* remove instrument */
308                         ev.type = SNDRV_SEQ_EVENT_INSTR_FREE;
309                         ev.data.ext.len = sizeof(remove);
310                         ev.data.ext.ptr = &remove;
311
312                         snd_seq_instr_event(&opl3->fm_ops, opl3->ilist, &ev,
313                                             opl3->seq_client, 0, 0);
314                         goto __again;
315                 }
316                 snd_leave_user(fs);
317
318                 kfree(put);
319         }
320         return err;
321 }
322
323 /* ioctl */
324 static int snd_opl3_ioctl_seq_oss(struct snd_seq_oss_arg *arg, unsigned int cmd,
325                                   unsigned long ioarg)
326 {
327         struct snd_opl3 *opl3;
328
329         snd_assert(arg != NULL, return -ENXIO);
330         opl3 = arg->private_data;
331         switch (cmd) {
332                 case SNDCTL_FM_LOAD_INSTR:
333                         snd_printk("OPL3: Obsolete ioctl(SNDCTL_FM_LOAD_INSTR) used. Fix the program.\n");
334                         return -EINVAL;
335
336                 case SNDCTL_SYNTH_MEMAVL:
337                         return 0x7fffffff;
338
339                 case SNDCTL_FM_4OP_ENABLE:
340                         // handled automatically by OPL instrument type
341                         return 0;
342
343                 default:
344                         return -EINVAL;
345         }
346         return 0;
347 }
348
349 /* reset device */
350 static int snd_opl3_reset_seq_oss(struct snd_seq_oss_arg *arg)
351 {
352         struct snd_opl3 *opl3;
353
354         snd_assert(arg != NULL, return -ENXIO);
355         opl3 = arg->private_data;
356
357         return 0;
358 }