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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 LT |
118 | |
119 | snprintf(codec->name, sizeof(codec->name), | |
120 | "%s[%d]", codec->name, h->attached); | |
121 | codec->master_data = master; | |
122 | res = codec->setup(codec); | |
123 | if (res == 0) { | |
124 | dprintk(3, "videocodec_attach '%s'\n", | |
125 | codec->name); | |
7408187d | 126 | ptr = kzalloc(sizeof(struct attached_list), GFP_KERNEL); |
1da177e4 LT |
127 | if (!ptr) { |
128 | dprintk(1, | |
129 | KERN_ERR | |
130 | "videocodec_attach: no memory\n"); | |
131 | goto out_kfree; | |
132 | } | |
1da177e4 LT |
133 | ptr->codec = codec; |
134 | ||
135 | a = h->list; | |
136 | if (!a) { | |
137 | h->list = ptr; | |
138 | dprintk(4, | |
139 | "videocodec: first element\n"); | |
140 | } else { | |
141 | while (a->next) | |
142 | a = a->next; // find end | |
143 | a->next = ptr; | |
144 | dprintk(4, | |
145 | "videocodec: in after '%s'\n", | |
146 | h->codec->name); | |
147 | } | |
148 | ||
149 | h->attached += 1; | |
150 | return codec; | |
151 | } else { | |
152 | kfree(codec); | |
153 | } | |
154 | } | |
155 | h = h->next; | |
156 | } | |
157 | ||
158 | dprintk(1, KERN_ERR "videocodec_attach: no codec found!\n"); | |
159 | return NULL; | |
160 | ||
161 | out_module_put: | |
162 | module_put(h->codec->owner); | |
163 | out_kfree: | |
164 | kfree(codec); | |
165 | return NULL; | |
166 | } | |
167 | ||
168 | int | |
169 | videocodec_detach (struct videocodec *codec) | |
170 | { | |
171 | struct codec_list *h = codeclist_top; | |
172 | struct attached_list *a, *prev; | |
173 | int res; | |
174 | ||
175 | if (!codec) { | |
176 | dprintk(1, KERN_ERR "videocodec_detach: no data\n"); | |
177 | return -EINVAL; | |
178 | } | |
179 | ||
180 | dprintk(2, | |
181 | "videocodec_detach: '%s', type: %x, flags %lx, magic %lx\n", | |
182 | codec->name, codec->type, codec->flags, codec->magic); | |
183 | ||
184 | if (!h) { | |
185 | dprintk(1, | |
186 | KERN_ERR "videocodec_detach: no device left...\n"); | |
187 | return -ENXIO; | |
188 | } | |
189 | ||
190 | while (h) { | |
191 | a = h->list; | |
192 | prev = NULL; | |
193 | while (a) { | |
194 | if (codec == a->codec) { | |
195 | res = a->codec->unset(a->codec); | |
196 | if (res >= 0) { | |
197 | dprintk(3, | |
198 | "videocodec_detach: '%s'\n", | |
199 | a->codec->name); | |
200 | a->codec->master_data = NULL; | |
201 | } else { | |
202 | dprintk(1, | |
203 | KERN_ERR | |
204 | "videocodec_detach: '%s'\n", | |
205 | a->codec->name); | |
206 | a->codec->master_data = NULL; | |
207 | } | |
208 | if (prev == NULL) { | |
209 | h->list = a->next; | |
210 | dprintk(4, | |
211 | "videocodec: delete first\n"); | |
212 | } else { | |
213 | prev->next = a->next; | |
214 | dprintk(4, | |
215 | "videocodec: delete middle\n"); | |
216 | } | |
217 | module_put(a->codec->owner); | |
218 | kfree(a->codec); | |
219 | kfree(a); | |
220 | h->attached -= 1; | |
221 | return 0; | |
222 | } | |
223 | prev = a; | |
224 | a = a->next; | |
225 | } | |
226 | h = h->next; | |
227 | } | |
228 | ||
229 | dprintk(1, KERN_ERR "videocodec_detach: given codec not found!\n"); | |
230 | return -EINVAL; | |
231 | } | |
232 | ||
233 | int | |
234 | videocodec_register (const struct videocodec *codec) | |
235 | { | |
236 | struct codec_list *ptr, *h = codeclist_top; | |
237 | ||
238 | if (!codec) { | |
239 | dprintk(1, KERN_ERR "videocodec_register: no data!\n"); | |
240 | return -EINVAL; | |
241 | } | |
242 | ||
243 | dprintk(2, | |
244 | "videocodec: register '%s', type: %x, flags %lx, magic %lx\n", | |
245 | codec->name, codec->type, codec->flags, codec->magic); | |
246 | ||
7408187d | 247 | ptr = kzalloc(sizeof(struct codec_list), GFP_KERNEL); |
1da177e4 LT |
248 | if (!ptr) { |
249 | dprintk(1, KERN_ERR "videocodec_register: no memory\n"); | |
250 | return -ENOMEM; | |
251 | } | |
1da177e4 LT |
252 | ptr->codec = codec; |
253 | ||
254 | if (!h) { | |
255 | codeclist_top = ptr; | |
256 | dprintk(4, "videocodec: hooked in as first element\n"); | |
257 | } else { | |
258 | while (h->next) | |
259 | h = h->next; // find the end | |
260 | h->next = ptr; | |
261 | dprintk(4, "videocodec: hooked in after '%s'\n", | |
262 | h->codec->name); | |
263 | } | |
264 | ||
265 | return 0; | |
266 | } | |
267 | ||
268 | int | |
269 | videocodec_unregister (const struct videocodec *codec) | |
270 | { | |
271 | struct codec_list *prev = NULL, *h = codeclist_top; | |
272 | ||
273 | if (!codec) { | |
274 | dprintk(1, KERN_ERR "videocodec_unregister: no data!\n"); | |
275 | return -EINVAL; | |
276 | } | |
277 | ||
278 | dprintk(2, | |
279 | "videocodec: unregister '%s', type: %x, flags %lx, magic %lx\n", | |
280 | codec->name, codec->type, codec->flags, codec->magic); | |
281 | ||
282 | if (!h) { | |
283 | dprintk(1, | |
284 | KERN_ERR | |
285 | "videocodec_unregister: no device left...\n"); | |
286 | return -ENXIO; | |
287 | } | |
288 | ||
289 | while (h) { | |
290 | if (codec == h->codec) { | |
291 | if (h->attached) { | |
292 | dprintk(1, | |
293 | KERN_ERR | |
294 | "videocodec: '%s' is used\n", | |
295 | h->codec->name); | |
296 | return -EBUSY; | |
297 | } | |
298 | dprintk(3, "videocodec: unregister '%s' is ok.\n", | |
299 | h->codec->name); | |
300 | if (prev == NULL) { | |
301 | codeclist_top = h->next; | |
302 | dprintk(4, | |
303 | "videocodec: delete first element\n"); | |
304 | } else { | |
305 | prev->next = h->next; | |
306 | dprintk(4, | |
307 | "videocodec: delete middle element\n"); | |
308 | } | |
309 | kfree(h); | |
310 | return 0; | |
311 | } | |
312 | prev = h; | |
313 | h = h->next; | |
314 | } | |
315 | ||
316 | dprintk(1, | |
317 | KERN_ERR | |
318 | "videocodec_unregister: given codec not found!\n"); | |
319 | return -EINVAL; | |
320 | } | |
321 | ||
322 | #ifdef CONFIG_PROC_FS | |
9faa2d75 | 323 | static int proc_videocodecs_show(struct seq_file *m, void *v) |
1da177e4 LT |
324 | { |
325 | struct codec_list *h = codeclist_top; | |
326 | struct attached_list *a; | |
1da177e4 | 327 | |
9faa2d75 AD |
328 | seq_printf(m, "<S>lave or attached <M>aster name type flags magic "); |
329 | seq_printf(m, "(connected as)\n"); | |
1da177e4 LT |
330 | |
331 | h = codeclist_top; | |
332 | while (h) { | |
9faa2d75 | 333 | seq_printf(m, "S %32s %04x %08lx %08lx (TEMPLATE)\n", |
1da177e4 LT |
334 | h->codec->name, h->codec->type, |
335 | h->codec->flags, h->codec->magic); | |
336 | a = h->list; | |
337 | while (a) { | |
9faa2d75 | 338 | seq_printf(m, "M %32s %04x %08lx %08lx (%s)\n", |
1da177e4 LT |
339 | a->codec->master_data->name, |
340 | a->codec->master_data->type, | |
341 | a->codec->master_data->flags, | |
342 | a->codec->master_data->magic, | |
343 | a->codec->name); | |
344 | a = a->next; | |
345 | } | |
346 | h = h->next; | |
347 | } | |
348 | ||
9faa2d75 | 349 | return 0; |
1da177e4 LT |
350 | } |
351 | ||
9faa2d75 | 352 | static int proc_videocodecs_open(struct inode *inode, struct file *file) |
1da177e4 | 353 | { |
9faa2d75 | 354 | return single_open(file, proc_videocodecs_show, NULL); |
1da177e4 | 355 | } |
9faa2d75 AD |
356 | |
357 | static const struct file_operations videocodecs_proc_fops = { | |
358 | .owner = THIS_MODULE, | |
359 | .open = proc_videocodecs_open, | |
360 | .read = seq_read, | |
361 | .llseek = seq_lseek, | |
362 | .release = single_release, | |
363 | }; | |
1da177e4 LT |
364 | #endif |
365 | ||
366 | /* ===================== */ | |
367 | /* hook in driver module */ | |
368 | /* ===================== */ | |
369 | static int __init | |
370 | videocodec_init (void) | |
371 | { | |
372 | #ifdef CONFIG_PROC_FS | |
373 | static struct proc_dir_entry *videocodec_proc_entry; | |
374 | #endif | |
375 | ||
376 | printk(KERN_INFO "Linux video codec intermediate layer: %s\n", | |
377 | VIDEOCODEC_VERSION); | |
378 | ||
379 | #ifdef CONFIG_PROC_FS | |
9faa2d75 AD |
380 | videocodec_proc_entry = proc_create("videocodecs", 0, NULL, &videocodecs_proc_fops); |
381 | if (!videocodec_proc_entry) { | |
1da177e4 LT |
382 | dprintk(1, KERN_ERR "videocodec: can't init procfs.\n"); |
383 | } | |
384 | #endif | |
385 | return 0; | |
386 | } | |
387 | ||
388 | static void __exit | |
389 | videocodec_exit (void) | |
390 | { | |
391 | #ifdef CONFIG_PROC_FS | |
392 | remove_proc_entry("videocodecs", NULL); | |
1da177e4 LT |
393 | #endif |
394 | } | |
395 | ||
396 | EXPORT_SYMBOL(videocodec_attach); | |
397 | EXPORT_SYMBOL(videocodec_detach); | |
398 | EXPORT_SYMBOL(videocodec_register); | |
399 | EXPORT_SYMBOL(videocodec_unregister); | |
400 | ||
401 | module_init(videocodec_init); | |
402 | module_exit(videocodec_exit); | |
403 | ||
404 | MODULE_AUTHOR("Wolfgang Scherr <scherr@net4you.at>"); | |
405 | MODULE_DESCRIPTION("Intermediate API module for video codecs " | |
406 | VIDEOCODEC_VERSION); | |
407 | MODULE_LICENSE("GPL"); |