ALSA: seq: oss: Constify snd_seq_oss_callback definitions
[muen/linux.git] / sound / drivers / opl3 / opl3_oss.c
1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3  *  Interface for OSS sequencer emulation
4  *
5  *  Copyright (C) 2000 Uros Bizjak <uros@kss-loka.si>
6  */
7
8 #include <linux/export.h>
9 #include "opl3_voice.h"
10
11 static int snd_opl3_open_seq_oss(struct snd_seq_oss_arg *arg, void *closure);
12 static int snd_opl3_close_seq_oss(struct snd_seq_oss_arg *arg);
13 static int snd_opl3_ioctl_seq_oss(struct snd_seq_oss_arg *arg, unsigned int cmd, unsigned long ioarg);
14 static int snd_opl3_load_patch_seq_oss(struct snd_seq_oss_arg *arg, int format, const char __user *buf, int offs, int count);
15 static int snd_opl3_reset_seq_oss(struct snd_seq_oss_arg *arg);
16
17 /* operators */
18
19 static const struct snd_seq_oss_callback oss_callback = {
20         .owner =        THIS_MODULE,
21         .open =         snd_opl3_open_seq_oss,
22         .close =        snd_opl3_close_seq_oss,
23         .ioctl =        snd_opl3_ioctl_seq_oss,
24         .load_patch =   snd_opl3_load_patch_seq_oss,
25         .reset =        snd_opl3_reset_seq_oss,
26 };
27
28 static int snd_opl3_oss_event_input(struct snd_seq_event *ev, int direct,
29                                     void *private_data, int atomic, int hop)
30 {
31         struct snd_opl3 *opl3 = private_data;
32
33         if (ev->type != SNDRV_SEQ_EVENT_OSS)
34                 snd_midi_process_event(&opl3_ops, ev, opl3->oss_chset);
35         return 0;
36 }
37
38 /* ------------------------------ */
39
40 static void snd_opl3_oss_free_port(void *private_data)
41 {
42         struct snd_opl3 *opl3 = private_data;
43
44         snd_midi_channel_free_set(opl3->oss_chset);
45 }
46
47 static int snd_opl3_oss_create_port(struct snd_opl3 * opl3)
48 {
49         struct snd_seq_port_callback callbacks;
50         char name[32];
51         int voices, opl_ver;
52
53         voices = (opl3->hardware < OPL3_HW_OPL3) ?
54                 MAX_OPL2_VOICES : MAX_OPL3_VOICES;
55         opl3->oss_chset = snd_midi_channel_alloc_set(voices);
56         if (opl3->oss_chset == NULL)
57                 return -ENOMEM;
58         opl3->oss_chset->private_data = opl3;
59
60         memset(&callbacks, 0, sizeof(callbacks));
61         callbacks.owner = THIS_MODULE;
62         callbacks.event_input = snd_opl3_oss_event_input;
63         callbacks.private_free = snd_opl3_oss_free_port;
64         callbacks.private_data = opl3;
65
66         opl_ver = (opl3->hardware & OPL3_HW_MASK) >> 8;
67         sprintf(name, "OPL%i OSS Port", opl_ver);
68
69         opl3->oss_chset->client = opl3->seq_client;
70         opl3->oss_chset->port = snd_seq_event_port_attach(opl3->seq_client, &callbacks,
71                                                           SNDRV_SEQ_PORT_CAP_WRITE,
72                                                           SNDRV_SEQ_PORT_TYPE_MIDI_GENERIC |
73                                                           SNDRV_SEQ_PORT_TYPE_MIDI_GM |
74                                                           SNDRV_SEQ_PORT_TYPE_HARDWARE |
75                                                           SNDRV_SEQ_PORT_TYPE_SYNTHESIZER,
76                                                           voices, voices,
77                                                           name);
78         if (opl3->oss_chset->port < 0) {
79                 int port;
80                 port = opl3->oss_chset->port;
81                 snd_midi_channel_free_set(opl3->oss_chset);
82                 return port;
83         }
84         return 0;
85 }
86
87 /* ------------------------------ */
88
89 /* register OSS synth */
90 void snd_opl3_init_seq_oss(struct snd_opl3 *opl3, char *name)
91 {
92         struct snd_seq_oss_reg *arg;
93         struct snd_seq_device *dev;
94
95         if (snd_seq_device_new(opl3->card, 0, SNDRV_SEQ_DEV_ID_OSS,
96                                sizeof(struct snd_seq_oss_reg), &dev) < 0)
97                 return;
98
99         opl3->oss_seq_dev = dev;
100         strlcpy(dev->name, name, sizeof(dev->name));
101         arg = SNDRV_SEQ_DEVICE_ARGPTR(dev);
102         arg->type = SYNTH_TYPE_FM;
103         if (opl3->hardware < OPL3_HW_OPL3) {
104                 arg->subtype = FM_TYPE_ADLIB;
105                 arg->nvoices = MAX_OPL2_VOICES;
106         } else {
107                 arg->subtype = FM_TYPE_OPL3;
108                 arg->nvoices = MAX_OPL3_VOICES;
109         }
110         arg->oper = oss_callback;
111         arg->private_data = opl3;
112
113         if (snd_opl3_oss_create_port(opl3)) {
114                 /* register to OSS synth table */
115                 snd_device_register(opl3->card, dev);
116         }
117 }
118
119 /* unregister */
120 void snd_opl3_free_seq_oss(struct snd_opl3 *opl3)
121 {
122         if (opl3->oss_seq_dev) {
123                 /* The instance should have been released in prior */
124                 opl3->oss_seq_dev = NULL;
125         }
126 }
127
128 /* ------------------------------ */
129
130 /* open OSS sequencer */
131 static int snd_opl3_open_seq_oss(struct snd_seq_oss_arg *arg, void *closure)
132 {
133         struct snd_opl3 *opl3 = closure;
134         int err;
135
136         if (snd_BUG_ON(!arg))
137                 return -ENXIO;
138
139         if ((err = snd_opl3_synth_setup(opl3)) < 0)
140                 return err;
141
142         /* fill the argument data */
143         arg->private_data = opl3;
144         arg->addr.client = opl3->oss_chset->client;
145         arg->addr.port = opl3->oss_chset->port;
146
147         if ((err = snd_opl3_synth_use_inc(opl3)) < 0)
148                 return err;
149
150         opl3->synth_mode = SNDRV_OPL3_MODE_SYNTH;
151         return 0;
152 }
153
154 /* close OSS sequencer */
155 static int snd_opl3_close_seq_oss(struct snd_seq_oss_arg *arg)
156 {
157         struct snd_opl3 *opl3;
158
159         if (snd_BUG_ON(!arg))
160                 return -ENXIO;
161         opl3 = arg->private_data;
162
163         snd_opl3_synth_cleanup(opl3);
164
165         snd_opl3_synth_use_dec(opl3);
166         return 0;
167 }
168
169 /* load patch */
170
171 /* from sound_config.h */
172 #define SBFM_MAXINSTR   256
173
174 static int snd_opl3_load_patch_seq_oss(struct snd_seq_oss_arg *arg, int format,
175                                        const char __user *buf, int offs, int count)
176 {
177         struct snd_opl3 *opl3;
178         struct sbi_instrument sbi;
179         char name[32];
180         int err, type;
181
182         if (snd_BUG_ON(!arg))
183                 return -ENXIO;
184         opl3 = arg->private_data;
185
186         if (format == FM_PATCH)
187                 type = FM_PATCH_OPL2;
188         else if (format == OPL3_PATCH)
189                 type = FM_PATCH_OPL3;
190         else
191                 return -EINVAL;
192
193         if (count < (int)sizeof(sbi)) {
194                 snd_printk(KERN_ERR "FM Error: Patch record too short\n");
195                 return -EINVAL;
196         }
197         if (copy_from_user(&sbi, buf, sizeof(sbi)))
198                 return -EFAULT;
199
200         if (sbi.channel < 0 || sbi.channel >= SBFM_MAXINSTR) {
201                 snd_printk(KERN_ERR "FM Error: Invalid instrument number %d\n",
202                            sbi.channel);
203                 return -EINVAL;
204         }
205
206         memset(name, 0, sizeof(name));
207         sprintf(name, "Chan%d", sbi.channel);
208
209         err = snd_opl3_load_patch(opl3, sbi.channel, 127, type, name, NULL,
210                                   sbi.operators);
211         if (err < 0)
212                 return err;
213
214         return sizeof(sbi);
215 }
216
217 /* ioctl */
218 static int snd_opl3_ioctl_seq_oss(struct snd_seq_oss_arg *arg, unsigned int cmd,
219                                   unsigned long ioarg)
220 {
221         if (snd_BUG_ON(!arg))
222                 return -ENXIO;
223         switch (cmd) {
224                 case SNDCTL_FM_LOAD_INSTR:
225                         snd_printk(KERN_ERR "OPL3: "
226                                    "Obsolete ioctl(SNDCTL_FM_LOAD_INSTR) used. "
227                                    "Fix the program.\n");
228                         return -EINVAL;
229
230                 case SNDCTL_SYNTH_MEMAVL:
231                         return 0x7fffffff;
232
233                 case SNDCTL_FM_4OP_ENABLE:
234                         // handled automatically by OPL instrument type
235                         return 0;
236
237                 default:
238                         return -EINVAL;
239         }
240         return 0;
241 }
242
243 /* reset device */
244 static int snd_opl3_reset_seq_oss(struct snd_seq_oss_arg *arg)
245 {
246         if (snd_BUG_ON(!arg))
247                 return -ENXIO;
248
249         return 0;
250 }