Commit | Line | Data |
---|---|---|
1da177e4 LT |
1 | /* |
2 | * VIDEO MOTION CODECs internal API for video devices | |
3 | * | |
4 | * Interface for MJPEG (and maybe later MPEG/WAVELETS) codec's | |
5 | * bound to a master device. | |
6 | * | |
7 | * (c) 2002 Wolfgang Scherr <scherr@net4you.at> | |
8 | * | |
9 | * $Id: videocodec.c,v 1.1.2.8 2003/03/29 07:16:04 rbultje Exp $ | |
10 | * | |
11 | * ------------------------------------------------------------------------ | |
12 | * | |
13 | * This program is free software; you can redistribute it and/or modify | |
14 | * it under the terms of the GNU General Public License as published by | |
15 | * the Free Software Foundation; either version 2 of the License, or | |
16 | * (at your option) any later version. | |
17 | * | |
18 | * This program is distributed in the hope that it will be useful, | |
19 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
20 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
21 | * GNU General Public License for more details. | |
22 | * | |
23 | * You should have received a copy of the GNU General Public License | |
24 | * along with this program; if not, write to the Free Software | |
25 | * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. | |
26 | * | |
27 | * ------------------------------------------------------------------------ | |
28 | */ | |
29 | ||
30 | #define VIDEOCODEC_VERSION "v0.2" | |
31 | ||
32 | #include <linux/kernel.h> | |
33 | #include <linux/module.h> | |
34 | #include <linux/init.h> | |
35 | #include <linux/types.h> | |
36 | #include <linux/slab.h> | |
37 | ||
38 | // kernel config is here (procfs flag) | |
1da177e4 LT |
39 | |
40 | #ifdef CONFIG_PROC_FS | |
41 | #include <linux/proc_fs.h> | |
9faa2d75 | 42 | #include <linux/seq_file.h> |
1da177e4 LT |
43 | #include <asm/uaccess.h> |
44 | #endif | |
45 | ||
46 | #include "videocodec.h" | |
47 | ||
ff699e6b | 48 | static int debug; |
1da177e4 LT |
49 | module_param(debug, int, 0); |
50 | MODULE_PARM_DESC(debug, "Debug level (0-4)"); | |
51 | ||
52 | #define dprintk(num, format, args...) \ | |
53 | do { \ | |
54 | if (debug >= num) \ | |
55 | printk(format, ##args); \ | |
56 | } while (0) | |
57 | ||
58 | struct attached_list { | |
59 | struct videocodec *codec; | |
60 | struct attached_list *next; | |
61 | }; | |
62 | ||
63 | struct codec_list { | |
64 | const struct videocodec *codec; | |
65 | int attached; | |
66 | struct attached_list *list; | |
67 | struct codec_list *next; | |
68 | }; | |
69 | ||
70 | static struct codec_list *codeclist_top = NULL; | |
71 | ||
72 | /* ================================================= */ | |
73 | /* function prototypes of the master/slave interface */ | |
74 | /* ================================================= */ | |
75 | ||
76 | struct videocodec * | |
77 | videocodec_attach (struct videocodec_master *master) | |
78 | { | |
79 | struct codec_list *h = codeclist_top; | |
80 | struct attached_list *a, *ptr; | |
81 | struct videocodec *codec; | |
82 | int res; | |
83 | ||
84 | if (!master) { | |
85 | dprintk(1, KERN_ERR "videocodec_attach: no data\n"); | |
86 | return NULL; | |
87 | } | |
88 | ||
89 | dprintk(2, | |
22c4a4e9 MCC |
90 | "videocodec_attach: '%s', flags %lx, magic %lx\n", |
91 | master->name, master->flags, master->magic); | |
1da177e4 LT |
92 | |
93 | if (!h) { | |
94 | dprintk(1, | |
95 | KERN_ERR | |
96 | "videocodec_attach: no device available\n"); | |
97 | return NULL; | |
98 | } | |
99 | ||
100 | while (h) { | |
101 | // attach only if the slave has at least the flags | |
102 | // expected by the master | |
103 | if ((master->flags & h->codec->flags) == master->flags) { | |
104 | dprintk(4, "videocodec_attach: try '%s'\n", | |
105 | h->codec->name); | |
106 | ||
107 | if (!try_module_get(h->codec->owner)) | |
108 | return NULL; | |
109 | ||
7a12f4b5 JL |
110 | codec = kmemdup(h->codec, sizeof(struct videocodec), |
111 | GFP_KERNEL); | |
1da177e4 LT |
112 | if (!codec) { |
113 | dprintk(1, | |
114 | KERN_ERR | |
115 | "videocodec_attach: no mem\n"); | |
116 | goto out_module_put; | |
117 | } | |
1da177e4 | 118 | |
e57b36c0 RV |
119 | res = strlen(codec->name); |
120 | snprintf(codec->name + res, sizeof(codec->name) - res, | |
121 | "[%d]", h->attached); | |
1da177e4 LT |
122 | codec->master_data = master; |
123 | res = codec->setup(codec); | |
124 | if (res == 0) { | |
125 | dprintk(3, "videocodec_attach '%s'\n", | |
126 | codec->name); | |
7408187d | 127 | ptr = kzalloc(sizeof(struct attached_list), GFP_KERNEL); |
1da177e4 LT |
128 | if (!ptr) { |
129 | dprintk(1, | |
130 | KERN_ERR | |
131 | "videocodec_attach: no memory\n"); | |
132 | goto out_kfree; | |
133 | } | |
1da177e4 LT |
134 | ptr->codec = codec; |
135 | ||
136 | a = h->list; | |
137 | if (!a) { | |
138 | h->list = ptr; | |
139 | dprintk(4, | |
140 | "videocodec: first element\n"); | |
141 | } else { | |
142 | while (a->next) | |
143 | a = a->next; // find end | |
144 | a->next = ptr; | |
145 | dprintk(4, | |
146 | "videocodec: in after '%s'\n", | |
147 | h->codec->name); | |
148 | } | |
149 | ||
150 | h->attached += 1; | |
151 | return codec; | |
152 | } else { | |
153 | kfree(codec); | |
154 | } | |
155 | } | |
156 | h = h->next; | |
157 | } | |
158 | ||
159 | dprintk(1, KERN_ERR "videocodec_attach: no codec found!\n"); | |
160 | return NULL; | |
161 | ||
162 | out_module_put: | |
163 | module_put(h->codec->owner); | |
164 | out_kfree: | |
165 | kfree(codec); | |
166 | return NULL; | |
167 | } | |
168 | ||
169 | int | |
170 | videocodec_detach (struct videocodec *codec) | |
171 | { | |
172 | struct codec_list *h = codeclist_top; | |
173 | struct attached_list *a, *prev; | |
174 | int res; | |
175 | ||
176 | if (!codec) { | |
177 | dprintk(1, KERN_ERR "videocodec_detach: no data\n"); | |
178 | return -EINVAL; | |
179 | } | |
180 | ||
181 | dprintk(2, | |
182 | "videocodec_detach: '%s', type: %x, flags %lx, magic %lx\n", | |
183 | codec->name, codec->type, codec->flags, codec->magic); | |
184 | ||
185 | if (!h) { | |
186 | dprintk(1, | |
187 | KERN_ERR "videocodec_detach: no device left...\n"); | |
188 | return -ENXIO; | |
189 | } | |
190 | ||
191 | while (h) { | |
192 | a = h->list; | |
193 | prev = NULL; | |
194 | while (a) { | |
195 | if (codec == a->codec) { | |
196 | res = a->codec->unset(a->codec); | |
197 | if (res >= 0) { | |
198 | dprintk(3, | |
199 | "videocodec_detach: '%s'\n", | |
200 | a->codec->name); | |
201 | a->codec->master_data = NULL; | |
202 | } else { | |
203 | dprintk(1, | |
204 | KERN_ERR | |
205 | "videocodec_detach: '%s'\n", | |
206 | a->codec->name); | |
207 | a->codec->master_data = NULL; | |
208 | } | |
209 | if (prev == NULL) { | |
210 | h->list = a->next; | |
211 | dprintk(4, | |
212 | "videocodec: delete first\n"); | |
213 | } else { | |
214 | prev->next = a->next; | |
215 | dprintk(4, | |
216 | "videocodec: delete middle\n"); | |
217 | } | |
218 | module_put(a->codec->owner); | |
219 | kfree(a->codec); | |
220 | kfree(a); | |
221 | h->attached -= 1; | |
222 | return 0; | |
223 | } | |
224 | prev = a; | |
225 | a = a->next; | |
226 | } | |
227 | h = h->next; | |
228 | } | |
229 | ||
230 | dprintk(1, KERN_ERR "videocodec_detach: given codec not found!\n"); | |
231 | return -EINVAL; | |
232 | } | |
233 | ||
234 | int | |
235 | videocodec_register (const struct videocodec *codec) | |
236 | { | |
237 | struct codec_list *ptr, *h = codeclist_top; | |
238 | ||
239 | if (!codec) { | |
240 | dprintk(1, KERN_ERR "videocodec_register: no data!\n"); | |
241 | return -EINVAL; | |
242 | } | |
243 | ||
244 | dprintk(2, | |
245 | "videocodec: register '%s', type: %x, flags %lx, magic %lx\n", | |
246 | codec->name, codec->type, codec->flags, codec->magic); | |
247 | ||
7408187d | 248 | ptr = kzalloc(sizeof(struct codec_list), GFP_KERNEL); |
1da177e4 LT |
249 | if (!ptr) { |
250 | dprintk(1, KERN_ERR "videocodec_register: no memory\n"); | |
251 | return -ENOMEM; | |
252 | } | |
1da177e4 LT |
253 | ptr->codec = codec; |
254 | ||
255 | if (!h) { | |
256 | codeclist_top = ptr; | |
257 | dprintk(4, "videocodec: hooked in as first element\n"); | |
258 | } else { | |
259 | while (h->next) | |
260 | h = h->next; // find the end | |
261 | h->next = ptr; | |
262 | dprintk(4, "videocodec: hooked in after '%s'\n", | |
263 | h->codec->name); | |
264 | } | |
265 | ||
266 | return 0; | |
267 | } | |
268 | ||
269 | int | |
270 | videocodec_unregister (const struct videocodec *codec) | |
271 | { | |
272 | struct codec_list *prev = NULL, *h = codeclist_top; | |
273 | ||
274 | if (!codec) { | |
275 | dprintk(1, KERN_ERR "videocodec_unregister: no data!\n"); | |
276 | return -EINVAL; | |
277 | } | |
278 | ||
279 | dprintk(2, | |
280 | "videocodec: unregister '%s', type: %x, flags %lx, magic %lx\n", | |
281 | codec->name, codec->type, codec->flags, codec->magic); | |
282 | ||
283 | if (!h) { | |
284 | dprintk(1, | |
285 | KERN_ERR | |
286 | "videocodec_unregister: no device left...\n"); | |
287 | return -ENXIO; | |
288 | } | |
289 | ||
290 | while (h) { | |
291 | if (codec == h->codec) { | |
292 | if (h->attached) { | |
293 | dprintk(1, | |
294 | KERN_ERR | |
295 | "videocodec: '%s' is used\n", | |
296 | h->codec->name); | |
297 | return -EBUSY; | |
298 | } | |
299 | dprintk(3, "videocodec: unregister '%s' is ok.\n", | |
300 | h->codec->name); | |
301 | if (prev == NULL) { | |
302 | codeclist_top = h->next; | |
303 | dprintk(4, | |
304 | "videocodec: delete first element\n"); | |
305 | } else { | |
306 | prev->next = h->next; | |
307 | dprintk(4, | |
308 | "videocodec: delete middle element\n"); | |
309 | } | |
310 | kfree(h); | |
311 | return 0; | |
312 | } | |
313 | prev = h; | |
314 | h = h->next; | |
315 | } | |
316 | ||
317 | dprintk(1, | |
318 | KERN_ERR | |
319 | "videocodec_unregister: given codec not found!\n"); | |
320 | return -EINVAL; | |
321 | } | |
322 | ||
323 | #ifdef CONFIG_PROC_FS | |
9faa2d75 | 324 | static int proc_videocodecs_show(struct seq_file *m, void *v) |
1da177e4 LT |
325 | { |
326 | struct codec_list *h = codeclist_top; | |
327 | struct attached_list *a; | |
1da177e4 | 328 | |
9faa2d75 AD |
329 | seq_printf(m, "<S>lave or attached <M>aster name type flags magic "); |
330 | seq_printf(m, "(connected as)\n"); | |
1da177e4 LT |
331 | |
332 | h = codeclist_top; | |
333 | while (h) { | |
9faa2d75 | 334 | seq_printf(m, "S %32s %04x %08lx %08lx (TEMPLATE)\n", |
1da177e4 LT |
335 | h->codec->name, h->codec->type, |
336 | h->codec->flags, h->codec->magic); | |
337 | a = h->list; | |
338 | while (a) { | |
9faa2d75 | 339 | seq_printf(m, "M %32s %04x %08lx %08lx (%s)\n", |
1da177e4 LT |
340 | a->codec->master_data->name, |
341 | a->codec->master_data->type, | |
342 | a->codec->master_data->flags, | |
343 | a->codec->master_data->magic, | |
344 | a->codec->name); | |
345 | a = a->next; | |
346 | } | |
347 | h = h->next; | |
348 | } | |
349 | ||
9faa2d75 | 350 | return 0; |
1da177e4 LT |
351 | } |
352 | ||
9faa2d75 | 353 | static int proc_videocodecs_open(struct inode *inode, struct file *file) |
1da177e4 | 354 | { |
9faa2d75 | 355 | return single_open(file, proc_videocodecs_show, NULL); |
1da177e4 | 356 | } |
9faa2d75 AD |
357 | |
358 | static const struct file_operations videocodecs_proc_fops = { | |
359 | .owner = THIS_MODULE, | |
360 | .open = proc_videocodecs_open, | |
361 | .read = seq_read, | |
362 | .llseek = seq_lseek, | |
363 | .release = single_release, | |
364 | }; | |
1da177e4 LT |
365 | #endif |
366 | ||
367 | /* ===================== */ | |
368 | /* hook in driver module */ | |
369 | /* ===================== */ | |
370 | static int __init | |
371 | videocodec_init (void) | |
372 | { | |
373 | #ifdef CONFIG_PROC_FS | |
374 | static struct proc_dir_entry *videocodec_proc_entry; | |
375 | #endif | |
376 | ||
377 | printk(KERN_INFO "Linux video codec intermediate layer: %s\n", | |
378 | VIDEOCODEC_VERSION); | |
379 | ||
380 | #ifdef CONFIG_PROC_FS | |
9faa2d75 AD |
381 | videocodec_proc_entry = proc_create("videocodecs", 0, NULL, &videocodecs_proc_fops); |
382 | if (!videocodec_proc_entry) { | |
1da177e4 LT |
383 | dprintk(1, KERN_ERR "videocodec: can't init procfs.\n"); |
384 | } | |
385 | #endif | |
386 | return 0; | |
387 | } | |
388 | ||
389 | static void __exit | |
390 | videocodec_exit (void) | |
391 | { | |
392 | #ifdef CONFIG_PROC_FS | |
393 | remove_proc_entry("videocodecs", NULL); | |
1da177e4 LT |
394 | #endif |
395 | } | |
396 | ||
397 | EXPORT_SYMBOL(videocodec_attach); | |
398 | EXPORT_SYMBOL(videocodec_detach); | |
399 | EXPORT_SYMBOL(videocodec_register); | |
400 | EXPORT_SYMBOL(videocodec_unregister); | |
401 | ||
402 | module_init(videocodec_init); | |
403 | module_exit(videocodec_exit); | |
404 | ||
405 | MODULE_AUTHOR("Wolfgang Scherr <scherr@net4you.at>"); | |
406 | MODULE_DESCRIPTION("Intermediate API module for video codecs " | |
407 | VIDEOCODEC_VERSION); | |
408 | MODULE_LICENSE("GPL"); |