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/slab.h>
29 #include <linux/list.h>
30 #include <linux/string.h>
31 #include <linux/mISDNif.h>
32 #include <linux/mISDNdsp.h>
33 #include <linux/export.h>
34 #include "dsp.h"
35 #include "dsp_hwec.h"
36
37 /* uncomment for debugging */
38 /*#define PIPELINE_DEBUG*/
39
40 struct dsp_pipeline_entry {
41 struct mISDN_dsp_element *elem;
42 void *p;
43 struct list_head list;
44 };
45 struct dsp_element_entry {
46 struct mISDN_dsp_element *elem;
47 struct device dev;
48 struct list_head list;
49 };
50
51 static LIST_HEAD(dsp_elements);
52
53 /* sysfs */
54 static struct class *elements_class;
55
56 static ssize_t
attr_show_args(struct device * dev,struct device_attribute * attr,char * buf)57 attr_show_args(struct device *dev, struct device_attribute *attr, char *buf)
58 {
59 struct mISDN_dsp_element *elem = dev_get_drvdata(dev);
60 int i;
61 char *p = buf;
62
63 *buf = 0;
64 for (i = 0; i < elem->num_args; i++)
65 p += sprintf(p, "Name: %s\n%s%s%sDescription: %s\n\n",
66 elem->args[i].name,
67 elem->args[i].def ? "Default: " : "",
68 elem->args[i].def ? elem->args[i].def : "",
69 elem->args[i].def ? "\n" : "",
70 elem->args[i].desc);
71
72 return p - buf;
73 }
74
75 static struct device_attribute element_attributes[] = {
76 __ATTR(args, 0444, attr_show_args, NULL),
77 };
78
79 static void
mISDN_dsp_dev_release(struct device * dev)80 mISDN_dsp_dev_release(struct device *dev)
81 {
82 struct dsp_element_entry *entry =
83 container_of(dev, struct dsp_element_entry, dev);
84 list_del(&entry->list);
85 kfree(entry);
86 }
87
mISDN_dsp_element_register(struct mISDN_dsp_element * elem)88 int mISDN_dsp_element_register(struct mISDN_dsp_element *elem)
89 {
90 struct dsp_element_entry *entry;
91 int ret, i;
92
93 if (!elem)
94 return -EINVAL;
95
96 entry = kzalloc(sizeof(struct dsp_element_entry), GFP_ATOMIC);
97 if (!entry)
98 return -ENOMEM;
99
100 entry->elem = elem;
101
102 entry->dev.class = elements_class;
103 entry->dev.release = mISDN_dsp_dev_release;
104 dev_set_drvdata(&entry->dev, elem);
105 dev_set_name(&entry->dev, "%s", elem->name);
106 ret = device_register(&entry->dev);
107 if (ret) {
108 printk(KERN_ERR "%s: failed to register %s\n",
109 __func__, elem->name);
110 goto err1;
111 }
112 list_add_tail(&entry->list, &dsp_elements);
113
114 for (i = 0; i < ARRAY_SIZE(element_attributes); ++i) {
115 ret = device_create_file(&entry->dev,
116 &element_attributes[i]);
117 if (ret) {
118 printk(KERN_ERR "%s: failed to create device file\n",
119 __func__);
120 goto err2;
121 }
122 }
123
124 #ifdef PIPELINE_DEBUG
125 printk(KERN_DEBUG "%s: %s registered\n", __func__, elem->name);
126 #endif
127
128 return 0;
129
130 err2:
131 device_unregister(&entry->dev);
132 return ret;
133 err1:
134 kfree(entry);
135 return ret;
136 }
137 EXPORT_SYMBOL(mISDN_dsp_element_register);
138
mISDN_dsp_element_unregister(struct mISDN_dsp_element * elem)139 void mISDN_dsp_element_unregister(struct mISDN_dsp_element *elem)
140 {
141 struct dsp_element_entry *entry, *n;
142
143 if (!elem)
144 return;
145
146 list_for_each_entry_safe(entry, n, &dsp_elements, list)
147 if (entry->elem == elem) {
148 device_unregister(&entry->dev);
149 #ifdef PIPELINE_DEBUG
150 printk(KERN_DEBUG "%s: %s unregistered\n",
151 __func__, elem->name);
152 #endif
153 return;
154 }
155 printk(KERN_ERR "%s: element %s not in list.\n", __func__, elem->name);
156 }
157 EXPORT_SYMBOL(mISDN_dsp_element_unregister);
158
dsp_pipeline_module_init(void)159 int dsp_pipeline_module_init(void)
160 {
161 elements_class = class_create(THIS_MODULE, "dsp_pipeline");
162 if (IS_ERR(elements_class))
163 return PTR_ERR(elements_class);
164
165 #ifdef PIPELINE_DEBUG
166 printk(KERN_DEBUG "%s: dsp pipeline module initialized\n", __func__);
167 #endif
168
169 dsp_hwec_init();
170
171 return 0;
172 }
173
dsp_pipeline_module_exit(void)174 void dsp_pipeline_module_exit(void)
175 {
176 struct dsp_element_entry *entry, *n;
177
178 dsp_hwec_exit();
179
180 class_destroy(elements_class);
181
182 list_for_each_entry_safe(entry, n, &dsp_elements, list) {
183 list_del(&entry->list);
184 printk(KERN_WARNING "%s: element was still registered: %s\n",
185 __func__, entry->elem->name);
186 kfree(entry);
187 }
188
189 #ifdef PIPELINE_DEBUG
190 printk(KERN_DEBUG "%s: dsp pipeline module exited\n", __func__);
191 #endif
192 }
193
dsp_pipeline_init(struct dsp_pipeline * pipeline)194 int dsp_pipeline_init(struct dsp_pipeline *pipeline)
195 {
196 if (!pipeline)
197 return -EINVAL;
198
199 INIT_LIST_HEAD(&pipeline->list);
200
201 #ifdef PIPELINE_DEBUG
202 printk(KERN_DEBUG "%s: dsp pipeline ready\n", __func__);
203 #endif
204
205 return 0;
206 }
207
_dsp_pipeline_destroy(struct dsp_pipeline * pipeline)208 static inline void _dsp_pipeline_destroy(struct dsp_pipeline *pipeline)
209 {
210 struct dsp_pipeline_entry *entry, *n;
211
212 list_for_each_entry_safe(entry, n, &pipeline->list, list) {
213 list_del(&entry->list);
214 if (entry->elem == dsp_hwec)
215 dsp_hwec_disable(container_of(pipeline, struct dsp,
216 pipeline));
217 else
218 entry->elem->free(entry->p);
219 kfree(entry);
220 }
221 }
222
dsp_pipeline_destroy(struct dsp_pipeline * pipeline)223 void dsp_pipeline_destroy(struct dsp_pipeline *pipeline)
224 {
225
226 if (!pipeline)
227 return;
228
229 _dsp_pipeline_destroy(pipeline);
230
231 #ifdef PIPELINE_DEBUG
232 printk(KERN_DEBUG "%s: dsp pipeline destroyed\n", __func__);
233 #endif
234 }
235
dsp_pipeline_build(struct dsp_pipeline * pipeline,const char * cfg)236 int dsp_pipeline_build(struct dsp_pipeline *pipeline, const char *cfg)
237 {
238 int incomplete = 0, found = 0;
239 char *dup, *tok, *name, *args;
240 struct dsp_element_entry *entry, *n;
241 struct dsp_pipeline_entry *pipeline_entry;
242 struct mISDN_dsp_element *elem;
243
244 if (!pipeline)
245 return -EINVAL;
246
247 if (!list_empty(&pipeline->list))
248 _dsp_pipeline_destroy(pipeline);
249
250 dup = kstrdup(cfg, GFP_ATOMIC);
251 if (!dup)
252 return 0;
253 while ((tok = strsep(&dup, "|"))) {
254 if (!strlen(tok))
255 continue;
256 name = strsep(&tok, "(");
257 args = strsep(&tok, ")");
258 if (args && !*args)
259 args = NULL;
260
261 list_for_each_entry_safe(entry, n, &dsp_elements, list)
262 if (!strcmp(entry->elem->name, name)) {
263 elem = entry->elem;
264
265 pipeline_entry = kmalloc(sizeof(struct
266 dsp_pipeline_entry), GFP_ATOMIC);
267 if (!pipeline_entry) {
268 printk(KERN_ERR "%s: failed to add "
269 "entry to pipeline: %s (out of "
270 "memory)\n", __func__, elem->name);
271 incomplete = 1;
272 goto _out;
273 }
274 pipeline_entry->elem = elem;
275
276 if (elem == dsp_hwec) {
277 /* This is a hack to make the hwec
278 available as a pipeline module */
279 dsp_hwec_enable(container_of(pipeline,
280 struct dsp, pipeline), args);
281 list_add_tail(&pipeline_entry->list,
282 &pipeline->list);
283 } else {
284 pipeline_entry->p = elem->new(args);
285 if (pipeline_entry->p) {
286 list_add_tail(&pipeline_entry->
287 list, &pipeline->list);
288 #ifdef PIPELINE_DEBUG
289 printk(KERN_DEBUG "%s: created "
290 "instance of %s%s%s\n",
291 __func__, name, args ?
292 " with args " : "", args ?
293 args : "");
294 #endif
295 } else {
296 printk(KERN_ERR "%s: failed "
297 "to add entry to pipeline: "
298 "%s (new() returned NULL)\n",
299 __func__, elem->name);
300 kfree(pipeline_entry);
301 incomplete = 1;
302 }
303 }
304 found = 1;
305 break;
306 }
307
308 if (found)
309 found = 0;
310 else {
311 printk(KERN_ERR "%s: element not found, skipping: "
312 "%s\n", __func__, name);
313 incomplete = 1;
314 }
315 }
316
317 _out:
318 if (!list_empty(&pipeline->list))
319 pipeline->inuse = 1;
320 else
321 pipeline->inuse = 0;
322
323 #ifdef PIPELINE_DEBUG
324 printk(KERN_DEBUG "%s: dsp pipeline built%s: %s\n",
325 __func__, incomplete ? " incomplete" : "", cfg);
326 #endif
327 kfree(dup);
328 return 0;
329 }
330
dsp_pipeline_process_tx(struct dsp_pipeline * pipeline,u8 * data,int len)331 void dsp_pipeline_process_tx(struct dsp_pipeline *pipeline, u8 *data, int len)
332 {
333 struct dsp_pipeline_entry *entry;
334
335 if (!pipeline)
336 return;
337
338 list_for_each_entry(entry, &pipeline->list, list)
339 if (entry->elem->process_tx)
340 entry->elem->process_tx(entry->p, data, len);
341 }
342
dsp_pipeline_process_rx(struct dsp_pipeline * pipeline,u8 * data,int len,unsigned int txlen)343 void dsp_pipeline_process_rx(struct dsp_pipeline *pipeline, u8 *data, int len,
344 unsigned int txlen)
345 {
346 struct dsp_pipeline_entry *entry;
347
348 if (!pipeline)
349 return;
350
351 list_for_each_entry_reverse(entry, &pipeline->list, list)
352 if (entry->elem->process_rx)
353 entry->elem->process_rx(entry->p, data, len, txlen);
354 }
355