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960366cf KK |
1 | /* |
2 | * dsp_pipeline.c: pipelined audio processing | |
3 | * | |
4 | * Copyright (C) 2007, Nadi Sarrar | |
5 | * | |
6 | * Nadi Sarrar <nadi@beronet.com> | |
7 | * | |
8 | * This program is free software; you can redistribute it and/or modify it | |
9 | * under the terms of the GNU General Public License as published by the Free | |
10 | * Software Foundation; either version 2 of the License, or (at your option) | |
11 | * any later version. | |
12 | * | |
13 | * This program is distributed in the hope that it will be useful, but WITHOUT | |
14 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
15 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for | |
16 | * more details. | |
17 | * | |
18 | * You should have received a copy of the GNU General Public License along with | |
19 | * this program; if not, write to the Free Software Foundation, Inc., 59 | |
20 | * Temple Place - Suite 330, Boston, MA 02111-1307, USA. | |
21 | * | |
22 | * The full GNU General Public License is included in this distribution in the | |
23 | * file called LICENSE. | |
24 | * | |
25 | */ | |
26 | ||
27 | #include <linux/kernel.h> | |
28 | #include <linux/list.h> | |
29 | #include <linux/string.h> | |
30 | #include <linux/mISDNif.h> | |
31 | #include <linux/mISDNdsp.h> | |
32 | #include "dsp.h" | |
33 | #include "dsp_hwec.h" | |
34 | ||
35 | /* uncomment for debugging */ | |
36 | /*#define PIPELINE_DEBUG*/ | |
37 | ||
38 | struct dsp_pipeline_entry { | |
39 | struct mISDN_dsp_element *elem; | |
40 | void *p; | |
41 | struct list_head list; | |
42 | }; | |
43 | struct dsp_element_entry { | |
44 | struct mISDN_dsp_element *elem; | |
45 | struct device dev; | |
46 | struct list_head list; | |
47 | }; | |
48 | ||
49 | static LIST_HEAD(dsp_elements); | |
50 | ||
51 | /* sysfs */ | |
52 | static struct class *elements_class; | |
53 | ||
54 | static ssize_t | |
55 | attr_show_args(struct device *dev, struct device_attribute *attr, char *buf) | |
56 | { | |
57 | struct mISDN_dsp_element *elem = dev_get_drvdata(dev); | |
58 | ssize_t len = 0; | |
59 | int i = 0; | |
60 | ||
61 | *buf = 0; | |
62 | for (; i < elem->num_args; ++i) | |
63 | len = sprintf(buf, "%sName: %s\n%s%s%sDescription: %s\n" | |
64 | "\n", buf, | |
65 | elem->args[i].name, | |
66 | elem->args[i].def ? "Default: " : "", | |
67 | elem->args[i].def ? elem->args[i].def : "", | |
68 | elem->args[i].def ? "\n" : "", | |
69 | elem->args[i].desc); | |
70 | ||
71 | return len; | |
72 | } | |
73 | ||
74 | static struct device_attribute element_attributes[] = { | |
75 | __ATTR(args, 0444, attr_show_args, NULL), | |
76 | }; | |
77 | ||
808a14a1 AE |
78 | static void |
79 | mISDN_dsp_dev_release(struct device *dev) | |
80 | { | |
81 | struct dsp_element_entry *entry = | |
82 | container_of(dev, struct dsp_element_entry, dev); | |
83 | list_del(&entry->list); | |
84 | kfree(entry); | |
85 | } | |
86 | ||
960366cf KK |
87 | int mISDN_dsp_element_register(struct mISDN_dsp_element *elem) |
88 | { | |
89 | struct dsp_element_entry *entry; | |
90 | int ret, i; | |
91 | ||
92 | if (!elem) | |
93 | return -EINVAL; | |
94 | ||
400fd978 | 95 | entry = kzalloc(sizeof(struct dsp_element_entry), GFP_ATOMIC); |
960366cf KK |
96 | if (!entry) |
97 | return -ENOMEM; | |
98 | ||
99 | entry->elem = elem; | |
100 | ||
101 | entry->dev.class = elements_class; | |
808a14a1 | 102 | entry->dev.release = mISDN_dsp_dev_release; |
960366cf | 103 | dev_set_drvdata(&entry->dev, elem); |
0162f382 | 104 | dev_set_name(&entry->dev, elem->name); |
960366cf KK |
105 | ret = device_register(&entry->dev); |
106 | if (ret) { | |
107 | printk(KERN_ERR "%s: failed to register %s\n", | |
108 | __func__, elem->name); | |
109 | goto err1; | |
110 | } | |
808a14a1 | 111 | list_add_tail(&entry->list, &dsp_elements); |
960366cf | 112 | |
21c150a6 | 113 | for (i = 0; i < ARRAY_SIZE(element_attributes); ++i) { |
960366cf KK |
114 | ret = device_create_file(&entry->dev, |
115 | &element_attributes[i]); | |
116 | if (ret) { | |
117 | printk(KERN_ERR "%s: failed to create device file\n", | |
118 | __func__); | |
119 | goto err2; | |
120 | } | |
21c150a6 | 121 | } |
960366cf | 122 | |
808a14a1 | 123 | #ifdef PIPELINE_DEBUG |
960366cf | 124 | printk(KERN_DEBUG "%s: %s registered\n", __func__, elem->name); |
808a14a1 | 125 | #endif |
960366cf KK |
126 | |
127 | return 0; | |
128 | ||
129 | err2: | |
130 | device_unregister(&entry->dev); | |
808a14a1 | 131 | return ret; |
960366cf KK |
132 | err1: |
133 | kfree(entry); | |
134 | return ret; | |
135 | } | |
136 | EXPORT_SYMBOL(mISDN_dsp_element_register); | |
137 | ||
138 | void mISDN_dsp_element_unregister(struct mISDN_dsp_element *elem) | |
139 | { | |
140 | struct dsp_element_entry *entry, *n; | |
141 | ||
142 | if (!elem) | |
143 | return; | |
144 | ||
145 | list_for_each_entry_safe(entry, n, &dsp_elements, list) | |
146 | if (entry->elem == elem) { | |
960366cf | 147 | device_unregister(&entry->dev); |
808a14a1 | 148 | #ifdef PIPELINE_DEBUG |
960366cf KK |
149 | printk(KERN_DEBUG "%s: %s unregistered\n", |
150 | __func__, elem->name); | |
808a14a1 | 151 | #endif |
960366cf KK |
152 | return; |
153 | } | |
154 | printk(KERN_ERR "%s: element %s not in list.\n", __func__, elem->name); | |
155 | } | |
156 | EXPORT_SYMBOL(mISDN_dsp_element_unregister); | |
157 | ||
158 | int dsp_pipeline_module_init(void) | |
159 | { | |
160 | elements_class = class_create(THIS_MODULE, "dsp_pipeline"); | |
161 | if (IS_ERR(elements_class)) | |
162 | return PTR_ERR(elements_class); | |
163 | ||
164 | #ifdef PIPELINE_DEBUG | |
165 | printk(KERN_DEBUG "%s: dsp pipeline module initialized\n", __func__); | |
166 | #endif | |
167 | ||
168 | dsp_hwec_init(); | |
169 | ||
170 | return 0; | |
171 | } | |
172 | ||
173 | void dsp_pipeline_module_exit(void) | |
174 | { | |
175 | struct dsp_element_entry *entry, *n; | |
176 | ||
177 | dsp_hwec_exit(); | |
178 | ||
179 | class_destroy(elements_class); | |
180 | ||
181 | list_for_each_entry_safe(entry, n, &dsp_elements, list) { | |
182 | list_del(&entry->list); | |
183 | printk(KERN_WARNING "%s: element was still registered: %s\n", | |
184 | __func__, entry->elem->name); | |
185 | kfree(entry); | |
186 | } | |
187 | ||
808a14a1 | 188 | #ifdef PIPELINE_DEBUG |
960366cf | 189 | printk(KERN_DEBUG "%s: dsp pipeline module exited\n", __func__); |
808a14a1 | 190 | #endif |
960366cf KK |
191 | } |
192 | ||
193 | int dsp_pipeline_init(struct dsp_pipeline *pipeline) | |
194 | { | |
195 | if (!pipeline) | |
196 | return -EINVAL; | |
197 | ||
198 | INIT_LIST_HEAD(&pipeline->list); | |
199 | ||
200 | #ifdef PIPELINE_DEBUG | |
201 | printk(KERN_DEBUG "%s: dsp pipeline ready\n", __func__); | |
202 | #endif | |
203 | ||
204 | return 0; | |
205 | } | |
206 | ||
207 | static inline void _dsp_pipeline_destroy(struct dsp_pipeline *pipeline) | |
208 | { | |
209 | struct dsp_pipeline_entry *entry, *n; | |
210 | ||
211 | list_for_each_entry_safe(entry, n, &pipeline->list, list) { | |
212 | list_del(&entry->list); | |
213 | if (entry->elem == dsp_hwec) | |
214 | dsp_hwec_disable(container_of(pipeline, struct dsp, | |
215 | pipeline)); | |
216 | else | |
217 | entry->elem->free(entry->p); | |
218 | kfree(entry); | |
219 | } | |
220 | } | |
221 | ||
222 | void dsp_pipeline_destroy(struct dsp_pipeline *pipeline) | |
223 | { | |
224 | ||
225 | if (!pipeline) | |
226 | return; | |
227 | ||
228 | _dsp_pipeline_destroy(pipeline); | |
229 | ||
230 | #ifdef PIPELINE_DEBUG | |
231 | printk(KERN_DEBUG "%s: dsp pipeline destroyed\n", __func__); | |
232 | #endif | |
233 | } | |
234 | ||
235 | int dsp_pipeline_build(struct dsp_pipeline *pipeline, const char *cfg) | |
236 | { | |
237 | int len, incomplete = 0, found = 0; | |
238 | char *dup, *tok, *name, *args; | |
239 | struct dsp_element_entry *entry, *n; | |
240 | struct dsp_pipeline_entry *pipeline_entry; | |
241 | struct mISDN_dsp_element *elem; | |
242 | ||
243 | if (!pipeline) | |
244 | return -EINVAL; | |
245 | ||
246 | if (!list_empty(&pipeline->list)) | |
247 | _dsp_pipeline_destroy(pipeline); | |
248 | ||
249 | if (!cfg) | |
250 | return 0; | |
251 | ||
252 | len = strlen(cfg); | |
253 | if (!len) | |
254 | return 0; | |
255 | ||
400fd978 | 256 | dup = kmalloc(len + 1, GFP_ATOMIC); |
960366cf KK |
257 | if (!dup) |
258 | return 0; | |
259 | strcpy(dup, cfg); | |
260 | while ((tok = strsep(&dup, "|"))) { | |
261 | if (!strlen(tok)) | |
262 | continue; | |
263 | name = strsep(&tok, "("); | |
264 | args = strsep(&tok, ")"); | |
265 | if (args && !*args) | |
bcf91745 | 266 | args = NULL; |
960366cf KK |
267 | |
268 | list_for_each_entry_safe(entry, n, &dsp_elements, list) | |
269 | if (!strcmp(entry->elem->name, name)) { | |
270 | elem = entry->elem; | |
271 | ||
272 | pipeline_entry = kmalloc(sizeof(struct | |
400fd978 | 273 | dsp_pipeline_entry), GFP_ATOMIC); |
960366cf | 274 | if (!pipeline_entry) { |
808a14a1 | 275 | printk(KERN_ERR "%s: failed to add " |
960366cf KK |
276 | "entry to pipeline: %s (out of " |
277 | "memory)\n", __func__, elem->name); | |
278 | incomplete = 1; | |
279 | goto _out; | |
280 | } | |
281 | pipeline_entry->elem = elem; | |
282 | ||
283 | if (elem == dsp_hwec) { | |
284 | /* This is a hack to make the hwec | |
285 | available as a pipeline module */ | |
286 | dsp_hwec_enable(container_of(pipeline, | |
287 | struct dsp, pipeline), args); | |
288 | list_add_tail(&pipeline_entry->list, | |
289 | &pipeline->list); | |
290 | } else { | |
291 | pipeline_entry->p = elem->new(args); | |
292 | if (pipeline_entry->p) { | |
293 | list_add_tail(&pipeline_entry-> | |
294 | list, &pipeline->list); | |
295 | #ifdef PIPELINE_DEBUG | |
296 | printk(KERN_DEBUG "%s: created " | |
297 | "instance of %s%s%s\n", | |
298 | __func__, name, args ? | |
299 | " with args " : "", args ? | |
300 | args : ""); | |
301 | #endif | |
302 | } else { | |
808a14a1 | 303 | printk(KERN_ERR "%s: failed " |
960366cf KK |
304 | "to add entry to pipeline: " |
305 | "%s (new() returned NULL)\n", | |
306 | __func__, elem->name); | |
307 | kfree(pipeline_entry); | |
308 | incomplete = 1; | |
309 | } | |
310 | } | |
311 | found = 1; | |
312 | break; | |
313 | } | |
314 | ||
315 | if (found) | |
316 | found = 0; | |
317 | else { | |
808a14a1 | 318 | printk(KERN_ERR "%s: element not found, skipping: " |
960366cf KK |
319 | "%s\n", __func__, name); |
320 | incomplete = 1; | |
321 | } | |
322 | } | |
323 | ||
324 | _out: | |
325 | if (!list_empty(&pipeline->list)) | |
326 | pipeline->inuse = 1; | |
327 | else | |
328 | pipeline->inuse = 0; | |
329 | ||
330 | #ifdef PIPELINE_DEBUG | |
331 | printk(KERN_DEBUG "%s: dsp pipeline built%s: %s\n", | |
332 | __func__, incomplete ? " incomplete" : "", cfg); | |
333 | #endif | |
334 | kfree(dup); | |
335 | return 0; | |
336 | } | |
337 | ||
338 | void dsp_pipeline_process_tx(struct dsp_pipeline *pipeline, u8 *data, int len) | |
339 | { | |
340 | struct dsp_pipeline_entry *entry; | |
341 | ||
342 | if (!pipeline) | |
343 | return; | |
344 | ||
345 | list_for_each_entry(entry, &pipeline->list, list) | |
346 | if (entry->elem->process_tx) | |
347 | entry->elem->process_tx(entry->p, data, len); | |
348 | } | |
349 | ||
350 | void dsp_pipeline_process_rx(struct dsp_pipeline *pipeline, u8 *data, int len) | |
351 | { | |
352 | struct dsp_pipeline_entry *entry; | |
353 | ||
354 | if (!pipeline) | |
355 | return; | |
356 | ||
357 | list_for_each_entry_reverse(entry, &pipeline->list, list) | |
358 | if (entry->elem->process_rx) | |
359 | entry->elem->process_rx(entry->p, data, len); | |
360 | } | |
361 | ||
362 |