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1// SPDX-License-Identifier: GPL-2.0-or-later
2/*
3 * dsp_pipeline.c: pipelined audio processing
4 *
5 * Copyright (C) 2007, Nadi Sarrar
6 *
7 * Nadi Sarrar <nadi@beronet.com>
8 */
9
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
20struct dsp_pipeline_entry {
21 struct mISDN_dsp_element *elem;
22 void *p;
23 struct list_head list;
24};
25struct dsp_element_entry {
26 struct mISDN_dsp_element *elem;
27 struct device dev;
28 struct list_head list;
29};
30
31static LIST_HEAD(dsp_elements);
32
33/* sysfs */
34static struct class *elements_class;
35
36static ssize_t
37attr_show_args(struct device *dev, struct device_attribute *attr, char *buf)
38{
39 struct mISDN_dsp_element *elem = dev_get_drvdata(dev);
40 int i;
41 char *p = buf;
42
43 *buf = 0;
44 for (i = 0; i < elem->num_args; i++)
45 p += sprintf(p, "Name: %s\n%s%s%sDescription: %s\n\n",
46 elem->args[i].name,
47 elem->args[i].def ? "Default: " : "",
48 elem->args[i].def ? elem->args[i].def : "",
49 elem->args[i].def ? "\n" : "",
50 elem->args[i].desc);
51
52 return p - buf;
53}
54
55static struct device_attribute element_attributes[] = {
56 __ATTR(args, 0444, attr_show_args, NULL),
57};
58
59static void
60mISDN_dsp_dev_release(struct device *dev)
61{
62 struct dsp_element_entry *entry =
63 container_of(dev, struct dsp_element_entry, dev);
64 list_del(&entry->list);
65 kfree(entry);
66}
67
68int mISDN_dsp_element_register(struct mISDN_dsp_element *elem)
69{
70 struct dsp_element_entry *entry;
71 int ret, i;
72
73 if (!elem)
74 return -EINVAL;
75
76 entry = kzalloc(sizeof(struct dsp_element_entry), GFP_ATOMIC);
77 if (!entry)
78 return -ENOMEM;
79
80 INIT_LIST_HEAD(&entry->list);
81 entry->elem = elem;
82
83 entry->dev.class = elements_class;
84 entry->dev.release = mISDN_dsp_dev_release;
85 dev_set_drvdata(&entry->dev, elem);
86 dev_set_name(&entry->dev, "%s", elem->name);
87 ret = device_register(&entry->dev);
88 if (ret) {
89 printk(KERN_ERR "%s: failed to register %s\n",
90 __func__, elem->name);
91 goto err1;
92 }
93 list_add_tail(&entry->list, &dsp_elements);
94
95 for (i = 0; i < ARRAY_SIZE(element_attributes); ++i) {
96 ret = device_create_file(&entry->dev,
97 &element_attributes[i]);
98 if (ret) {
99 printk(KERN_ERR "%s: failed to create device file\n",
100 __func__);
101 goto err2;
102 }
103 }
104
105 return 0;
106
107err2:
108 device_unregister(&entry->dev);
109 return ret;
110err1:
111 put_device(&entry->dev);
112 return ret;
113}
114EXPORT_SYMBOL(mISDN_dsp_element_register);
115
116void mISDN_dsp_element_unregister(struct mISDN_dsp_element *elem)
117{
118 struct dsp_element_entry *entry, *n;
119
120 if (!elem)
121 return;
122
123 list_for_each_entry_safe(entry, n, &dsp_elements, list)
124 if (entry->elem == elem) {
125 device_unregister(&entry->dev);
126 return;
127 }
128 printk(KERN_ERR "%s: element %s not in list.\n", __func__, elem->name);
129}
130EXPORT_SYMBOL(mISDN_dsp_element_unregister);
131
132int dsp_pipeline_module_init(void)
133{
134 elements_class = class_create("dsp_pipeline");
135 if (IS_ERR(elements_class))
136 return PTR_ERR(elements_class);
137
138 dsp_hwec_init();
139
140 return 0;
141}
142
143void dsp_pipeline_module_exit(void)
144{
145 struct dsp_element_entry *entry, *n;
146
147 dsp_hwec_exit();
148
149 class_destroy(elements_class);
150
151 list_for_each_entry_safe(entry, n, &dsp_elements, list) {
152 list_del(&entry->list);
153 printk(KERN_WARNING "%s: element was still registered: %s\n",
154 __func__, entry->elem->name);
155 kfree(entry);
156 }
157}
158
159int dsp_pipeline_init(struct dsp_pipeline *pipeline)
160{
161 if (!pipeline)
162 return -EINVAL;
163
164 INIT_LIST_HEAD(&pipeline->list);
165
166 return 0;
167}
168
169static inline void _dsp_pipeline_destroy(struct dsp_pipeline *pipeline)
170{
171 struct dsp_pipeline_entry *entry, *n;
172
173 list_for_each_entry_safe(entry, n, &pipeline->list, list) {
174 list_del(&entry->list);
175 if (entry->elem == dsp_hwec)
176 dsp_hwec_disable(container_of(pipeline, struct dsp,
177 pipeline));
178 else
179 entry->elem->free(entry->p);
180 kfree(entry);
181 }
182}
183
184void dsp_pipeline_destroy(struct dsp_pipeline *pipeline)
185{
186
187 if (!pipeline)
188 return;
189
190 _dsp_pipeline_destroy(pipeline);
191}
192
193int dsp_pipeline_build(struct dsp_pipeline *pipeline, const char *cfg)
194{
195 int found = 0;
196 char *dup, *next, *tok, *name, *args;
197 struct dsp_element_entry *entry, *n;
198 struct dsp_pipeline_entry *pipeline_entry;
199 struct mISDN_dsp_element *elem;
200
201 if (!pipeline)
202 return -EINVAL;
203
204 if (!list_empty(&pipeline->list))
205 _dsp_pipeline_destroy(pipeline);
206
207 dup = next = kstrdup(cfg, GFP_ATOMIC);
208 if (!dup)
209 return 0;
210 while ((tok = strsep(&next, "|"))) {
211 if (!strlen(tok))
212 continue;
213 name = strsep(&tok, "(");
214 args = strsep(&tok, ")");
215 if (args && !*args)
216 args = NULL;
217
218 list_for_each_entry_safe(entry, n, &dsp_elements, list)
219 if (!strcmp(entry->elem->name, name)) {
220 elem = entry->elem;
221
222 pipeline_entry = kmalloc(sizeof(struct
223 dsp_pipeline_entry), GFP_ATOMIC);
224 if (!pipeline_entry) {
225 printk(KERN_ERR "%s: failed to add "
226 "entry to pipeline: %s (out of "
227 "memory)\n", __func__, elem->name);
228 goto _out;
229 }
230 pipeline_entry->elem = elem;
231
232 if (elem == dsp_hwec) {
233 /* This is a hack to make the hwec
234 available as a pipeline module */
235 dsp_hwec_enable(container_of(pipeline,
236 struct dsp, pipeline), args);
237 list_add_tail(&pipeline_entry->list,
238 &pipeline->list);
239 } else {
240 pipeline_entry->p = elem->new(args);
241 if (pipeline_entry->p) {
242 list_add_tail(&pipeline_entry->
243 list, &pipeline->list);
244 } else {
245 printk(KERN_ERR "%s: failed "
246 "to add entry to pipeline: "
247 "%s (new() returned NULL)\n",
248 __func__, elem->name);
249 kfree(pipeline_entry);
250 }
251 }
252 found = 1;
253 break;
254 }
255
256 if (found)
257 found = 0;
258 else
259 printk(KERN_ERR "%s: element not found, skipping: "
260 "%s\n", __func__, name);
261 }
262
263_out:
264 if (!list_empty(&pipeline->list))
265 pipeline->inuse = 1;
266 else
267 pipeline->inuse = 0;
268
269 kfree(dup);
270 return 0;
271}
272
273void dsp_pipeline_process_tx(struct dsp_pipeline *pipeline, u8 *data, int len)
274{
275 struct dsp_pipeline_entry *entry;
276
277 if (!pipeline)
278 return;
279
280 list_for_each_entry(entry, &pipeline->list, list)
281 if (entry->elem->process_tx)
282 entry->elem->process_tx(entry->p, data, len);
283}
284
285void dsp_pipeline_process_rx(struct dsp_pipeline *pipeline, u8 *data, int len,
286 unsigned int txlen)
287{
288 struct dsp_pipeline_entry *entry;
289
290 if (!pipeline)
291 return;
292
293 list_for_each_entry_reverse(entry, &pipeline->list, list)
294 if (entry->elem->process_rx)
295 entry->elem->process_rx(entry->p, data, len, txlen);
296}
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 "dsp.h"
34#include "dsp_hwec.h"
35
36/* uncomment for debugging */
37/*#define PIPELINE_DEBUG*/
38
39struct dsp_pipeline_entry {
40 struct mISDN_dsp_element *elem;
41 void *p;
42 struct list_head list;
43};
44struct dsp_element_entry {
45 struct mISDN_dsp_element *elem;
46 struct device dev;
47 struct list_head list;
48};
49
50static LIST_HEAD(dsp_elements);
51
52/* sysfs */
53static struct class *elements_class;
54
55static ssize_t
56attr_show_args(struct device *dev, struct device_attribute *attr, char *buf)
57{
58 struct mISDN_dsp_element *elem = dev_get_drvdata(dev);
59 int i;
60 char *p = buf;
61
62 *buf = 0;
63 for (i = 0; i < elem->num_args; i++)
64 p += sprintf(p, "Name: %s\n%s%s%sDescription: %s\n\n",
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 p - buf;
72}
73
74static struct device_attribute element_attributes[] = {
75 __ATTR(args, 0444, attr_show_args, NULL),
76};
77
78static void
79mISDN_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
87int 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
95 entry = kzalloc(sizeof(struct dsp_element_entry), GFP_ATOMIC);
96 if (!entry)
97 return -ENOMEM;
98
99 entry->elem = elem;
100
101 entry->dev.class = elements_class;
102 entry->dev.release = mISDN_dsp_dev_release;
103 dev_set_drvdata(&entry->dev, elem);
104 dev_set_name(&entry->dev, elem->name);
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 }
111 list_add_tail(&entry->list, &dsp_elements);
112
113 for (i = 0; i < ARRAY_SIZE(element_attributes); ++i) {
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 }
121 }
122
123#ifdef PIPELINE_DEBUG
124 printk(KERN_DEBUG "%s: %s registered\n", __func__, elem->name);
125#endif
126
127 return 0;
128
129err2:
130 device_unregister(&entry->dev);
131 return ret;
132err1:
133 kfree(entry);
134 return ret;
135}
136EXPORT_SYMBOL(mISDN_dsp_element_register);
137
138void 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) {
147 device_unregister(&entry->dev);
148#ifdef PIPELINE_DEBUG
149 printk(KERN_DEBUG "%s: %s unregistered\n",
150 __func__, elem->name);
151#endif
152 return;
153 }
154 printk(KERN_ERR "%s: element %s not in list.\n", __func__, elem->name);
155}
156EXPORT_SYMBOL(mISDN_dsp_element_unregister);
157
158int 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
173void 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
188#ifdef PIPELINE_DEBUG
189 printk(KERN_DEBUG "%s: dsp pipeline module exited\n", __func__);
190#endif
191}
192
193int 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
207static 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
222void 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
235int 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
256 dup = kmalloc(len + 1, GFP_ATOMIC);
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)
266 args = NULL;
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
273 dsp_pipeline_entry), GFP_ATOMIC);
274 if (!pipeline_entry) {
275 printk(KERN_ERR "%s: failed to add "
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 {
303 printk(KERN_ERR "%s: failed "
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 {
318 printk(KERN_ERR "%s: element not found, skipping: "
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
338void 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
350void dsp_pipeline_process_rx(struct dsp_pipeline *pipeline, u8 *data, int len,
351 unsigned int txlen)
352{
353 struct dsp_pipeline_entry *entry;
354
355 if (!pipeline)
356 return;
357
358 list_for_each_entry_reverse(entry, &pipeline->list, list)
359 if (entry->elem->process_rx)
360 entry->elem->process_rx(entry->p, data, len, txlen);
361}
362
363