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10#include <linux/kernel.h>
11#include <linux/slab.h>
12#include <linux/list.h>
13#include <linux/string.h>
14#include <linux/mISDNif.h>
15#include <linux/mISDNdsp.h>
16#include <linux/export.h>
17#include "dsp.h"
18#include "dsp_hwec.h"
19
20
21
22
23struct dsp_pipeline_entry {
24 struct mISDN_dsp_element *elem;
25 void *p;
26 struct list_head list;
27};
28struct dsp_element_entry {
29 struct mISDN_dsp_element *elem;
30 struct device dev;
31 struct list_head list;
32};
33
34static LIST_HEAD(dsp_elements);
35
36
37static struct class *elements_class;
38
39static ssize_t
40attr_show_args(struct device *dev, struct device_attribute *attr, char *buf)
41{
42 struct mISDN_dsp_element *elem = dev_get_drvdata(dev);
43 int i;
44 char *p = buf;
45
46 *buf = 0;
47 for (i = 0; i < elem->num_args; i++)
48 p += sprintf(p, "Name: %s\n%s%s%sDescription: %s\n\n",
49 elem->args[i].name,
50 elem->args[i].def ? "Default: " : "",
51 elem->args[i].def ? elem->args[i].def : "",
52 elem->args[i].def ? "\n" : "",
53 elem->args[i].desc);
54
55 return p - buf;
56}
57
58static struct device_attribute element_attributes[] = {
59 __ATTR(args, 0444, attr_show_args, NULL),
60};
61
62static void
63mISDN_dsp_dev_release(struct device *dev)
64{
65 struct dsp_element_entry *entry =
66 container_of(dev, struct dsp_element_entry, dev);
67 list_del(&entry->list);
68 kfree(entry);
69}
70
71int mISDN_dsp_element_register(struct mISDN_dsp_element *elem)
72{
73 struct dsp_element_entry *entry;
74 int ret, i;
75
76 if (!elem)
77 return -EINVAL;
78
79 entry = kzalloc(sizeof(struct dsp_element_entry), GFP_ATOMIC);
80 if (!entry)
81 return -ENOMEM;
82
83 entry->elem = elem;
84
85 entry->dev.class = elements_class;
86 entry->dev.release = mISDN_dsp_dev_release;
87 dev_set_drvdata(&entry->dev, elem);
88 dev_set_name(&entry->dev, "%s", elem->name);
89 ret = device_register(&entry->dev);
90 if (ret) {
91 printk(KERN_ERR "%s: failed to register %s\n",
92 __func__, elem->name);
93 goto err1;
94 }
95 list_add_tail(&entry->list, &dsp_elements);
96
97 for (i = 0; i < ARRAY_SIZE(element_attributes); ++i) {
98 ret = device_create_file(&entry->dev,
99 &element_attributes[i]);
100 if (ret) {
101 printk(KERN_ERR "%s: failed to create device file\n",
102 __func__);
103 goto err2;
104 }
105 }
106
107#ifdef PIPELINE_DEBUG
108 printk(KERN_DEBUG "%s: %s registered\n", __func__, elem->name);
109#endif
110
111 return 0;
112
113err2:
114 device_unregister(&entry->dev);
115 return ret;
116err1:
117 kfree(entry);
118 return ret;
119}
120EXPORT_SYMBOL(mISDN_dsp_element_register);
121
122void mISDN_dsp_element_unregister(struct mISDN_dsp_element *elem)
123{
124 struct dsp_element_entry *entry, *n;
125
126 if (!elem)
127 return;
128
129 list_for_each_entry_safe(entry, n, &dsp_elements, list)
130 if (entry->elem == elem) {
131 device_unregister(&entry->dev);
132#ifdef PIPELINE_DEBUG
133 printk(KERN_DEBUG "%s: %s unregistered\n",
134 __func__, elem->name);
135#endif
136 return;
137 }
138 printk(KERN_ERR "%s: element %s not in list.\n", __func__, elem->name);
139}
140EXPORT_SYMBOL(mISDN_dsp_element_unregister);
141
142int dsp_pipeline_module_init(void)
143{
144 elements_class = class_create(THIS_MODULE, "dsp_pipeline");
145 if (IS_ERR(elements_class))
146 return PTR_ERR(elements_class);
147
148#ifdef PIPELINE_DEBUG
149 printk(KERN_DEBUG "%s: dsp pipeline module initialized\n", __func__);
150#endif
151
152 dsp_hwec_init();
153
154 return 0;
155}
156
157void dsp_pipeline_module_exit(void)
158{
159 struct dsp_element_entry *entry, *n;
160
161 dsp_hwec_exit();
162
163 class_destroy(elements_class);
164
165 list_for_each_entry_safe(entry, n, &dsp_elements, list) {
166 list_del(&entry->list);
167 printk(KERN_WARNING "%s: element was still registered: %s\n",
168 __func__, entry->elem->name);
169 kfree(entry);
170 }
171
172#ifdef PIPELINE_DEBUG
173 printk(KERN_DEBUG "%s: dsp pipeline module exited\n", __func__);
174#endif
175}
176
177int dsp_pipeline_init(struct dsp_pipeline *pipeline)
178{
179 if (!pipeline)
180 return -EINVAL;
181
182 INIT_LIST_HEAD(&pipeline->list);
183
184#ifdef PIPELINE_DEBUG
185 printk(KERN_DEBUG "%s: dsp pipeline ready\n", __func__);
186#endif
187
188 return 0;
189}
190
191static inline void _dsp_pipeline_destroy(struct dsp_pipeline *pipeline)
192{
193 struct dsp_pipeline_entry *entry, *n;
194
195 list_for_each_entry_safe(entry, n, &pipeline->list, list) {
196 list_del(&entry->list);
197 if (entry->elem == dsp_hwec)
198 dsp_hwec_disable(container_of(pipeline, struct dsp,
199 pipeline));
200 else
201 entry->elem->free(entry->p);
202 kfree(entry);
203 }
204}
205
206void dsp_pipeline_destroy(struct dsp_pipeline *pipeline)
207{
208
209 if (!pipeline)
210 return;
211
212 _dsp_pipeline_destroy(pipeline);
213
214#ifdef PIPELINE_DEBUG
215 printk(KERN_DEBUG "%s: dsp pipeline destroyed\n", __func__);
216#endif
217}
218
219int dsp_pipeline_build(struct dsp_pipeline *pipeline, const char *cfg)
220{
221 int incomplete = 0, found = 0;
222 char *dup, *tok, *name, *args;
223 struct dsp_element_entry *entry, *n;
224 struct dsp_pipeline_entry *pipeline_entry;
225 struct mISDN_dsp_element *elem;
226
227 if (!pipeline)
228 return -EINVAL;
229
230 if (!list_empty(&pipeline->list))
231 _dsp_pipeline_destroy(pipeline);
232
233 dup = kstrdup(cfg, GFP_ATOMIC);
234 if (!dup)
235 return 0;
236 while ((tok = strsep(&dup, "|"))) {
237 if (!strlen(tok))
238 continue;
239 name = strsep(&tok, "(");
240 args = strsep(&tok, ")");
241 if (args && !*args)
242 args = NULL;
243
244 list_for_each_entry_safe(entry, n, &dsp_elements, list)
245 if (!strcmp(entry->elem->name, name)) {
246 elem = entry->elem;
247
248 pipeline_entry = kmalloc(sizeof(struct
249 dsp_pipeline_entry), GFP_ATOMIC);
250 if (!pipeline_entry) {
251 printk(KERN_ERR "%s: failed to add "
252 "entry to pipeline: %s (out of "
253 "memory)\n", __func__, elem->name);
254 incomplete = 1;
255 goto _out;
256 }
257 pipeline_entry->elem = elem;
258
259 if (elem == dsp_hwec) {
260
261
262 dsp_hwec_enable(container_of(pipeline,
263 struct dsp, pipeline), args);
264 list_add_tail(&pipeline_entry->list,
265 &pipeline->list);
266 } else {
267 pipeline_entry->p = elem->new(args);
268 if (pipeline_entry->p) {
269 list_add_tail(&pipeline_entry->
270 list, &pipeline->list);
271#ifdef PIPELINE_DEBUG
272 printk(KERN_DEBUG "%s: created "
273 "instance of %s%s%s\n",
274 __func__, name, args ?
275 " with args " : "", args ?
276 args : "");
277#endif
278 } else {
279 printk(KERN_ERR "%s: failed "
280 "to add entry to pipeline: "
281 "%s (new() returned NULL)\n",
282 __func__, elem->name);
283 kfree(pipeline_entry);
284 incomplete = 1;
285 }
286 }
287 found = 1;
288 break;
289 }
290
291 if (found)
292 found = 0;
293 else {
294 printk(KERN_ERR "%s: element not found, skipping: "
295 "%s\n", __func__, name);
296 incomplete = 1;
297 }
298 }
299
300_out:
301 if (!list_empty(&pipeline->list))
302 pipeline->inuse = 1;
303 else
304 pipeline->inuse = 0;
305
306#ifdef PIPELINE_DEBUG
307 printk(KERN_DEBUG "%s: dsp pipeline built%s: %s\n",
308 __func__, incomplete ? " incomplete" : "", cfg);
309#endif
310 kfree(dup);
311 return 0;
312}
313
314void dsp_pipeline_process_tx(struct dsp_pipeline *pipeline, u8 *data, int len)
315{
316 struct dsp_pipeline_entry *entry;
317
318 if (!pipeline)
319 return;
320
321 list_for_each_entry(entry, &pipeline->list, list)
322 if (entry->elem->process_tx)
323 entry->elem->process_tx(entry->p, data, len);
324}
325
326void dsp_pipeline_process_rx(struct dsp_pipeline *pipeline, u8 *data, int len,
327 unsigned int txlen)
328{
329 struct dsp_pipeline_entry *entry;
330
331 if (!pipeline)
332 return;
333
334 list_for_each_entry_reverse(entry, &pipeline->list, list)
335 if (entry->elem->process_rx)
336 entry->elem->process_rx(entry->p, data, len, txlen);
337}
338
