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
20 struct dsp_pipeline_entry {
21 struct mISDN_dsp_element *elem;
22 void *p;
23 struct list_head list;
24 };
25 struct dsp_element_entry {
26 struct mISDN_dsp_element *elem;
27 struct device dev;
28 struct list_head list;
29 };
30
31 static LIST_HEAD(dsp_elements);
32
33 /* sysfs */
34 static const struct class elements_class = {
35 .name = "dsp_pipeline",
36 };
37
38 static ssize_t
attr_show_args(struct device * dev,struct device_attribute * attr,char * buf)39 attr_show_args(struct device *dev, struct device_attribute *attr, char *buf)
40 {
41 struct mISDN_dsp_element *elem = dev_get_drvdata(dev);
42 int i;
43 char *p = buf;
44
45 *buf = 0;
46 for (i = 0; i < elem->num_args; i++)
47 p += sprintf(p, "Name: %s\n%s%s%sDescription: %s\n\n",
48 elem->args[i].name,
49 elem->args[i].def ? "Default: " : "",
50 elem->args[i].def ? elem->args[i].def : "",
51 elem->args[i].def ? "\n" : "",
52 elem->args[i].desc);
53
54 return p - buf;
55 }
56
57 static struct device_attribute element_attributes[] = {
58 __ATTR(args, 0444, attr_show_args, NULL),
59 };
60
61 static void
mISDN_dsp_dev_release(struct device * dev)62 mISDN_dsp_dev_release(struct device *dev)
63 {
64 struct dsp_element_entry *entry =
65 container_of(dev, struct dsp_element_entry, dev);
66 list_del(&entry->list);
67 kfree(entry);
68 }
69
mISDN_dsp_element_register(struct mISDN_dsp_element * elem)70 int mISDN_dsp_element_register(struct mISDN_dsp_element *elem)
71 {
72 struct dsp_element_entry *entry;
73 int ret, i;
74
75 if (!elem)
76 return -EINVAL;
77
78 entry = kzalloc(sizeof(struct dsp_element_entry), GFP_ATOMIC);
79 if (!entry)
80 return -ENOMEM;
81
82 INIT_LIST_HEAD(&entry->list);
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 return 0;
108
109 err2:
110 device_unregister(&entry->dev);
111 return ret;
112 err1:
113 put_device(&entry->dev);
114 return ret;
115 }
116 EXPORT_SYMBOL(mISDN_dsp_element_register);
117
mISDN_dsp_element_unregister(struct mISDN_dsp_element * elem)118 void mISDN_dsp_element_unregister(struct mISDN_dsp_element *elem)
119 {
120 struct dsp_element_entry *entry, *n;
121
122 if (!elem)
123 return;
124
125 list_for_each_entry_safe(entry, n, &dsp_elements, list)
126 if (entry->elem == elem) {
127 device_unregister(&entry->dev);
128 return;
129 }
130 printk(KERN_ERR "%s: element %s not in list.\n", __func__, elem->name);
131 }
132 EXPORT_SYMBOL(mISDN_dsp_element_unregister);
133
dsp_pipeline_module_init(void)134 int dsp_pipeline_module_init(void)
135 {
136 int err;
137
138 err = class_register(&elements_class);
139 if (err)
140 return err;
141
142 dsp_hwec_init();
143
144 return 0;
145 }
146
dsp_pipeline_module_exit(void)147 void dsp_pipeline_module_exit(void)
148 {
149 struct dsp_element_entry *entry, *n;
150
151 dsp_hwec_exit();
152
153 class_unregister(&elements_class);
154
155 list_for_each_entry_safe(entry, n, &dsp_elements, list) {
156 list_del(&entry->list);
157 printk(KERN_WARNING "%s: element was still registered: %s\n",
158 __func__, entry->elem->name);
159 kfree(entry);
160 }
161 }
162
dsp_pipeline_init(struct dsp_pipeline * pipeline)163 int dsp_pipeline_init(struct dsp_pipeline *pipeline)
164 {
165 if (!pipeline)
166 return -EINVAL;
167
168 INIT_LIST_HEAD(&pipeline->list);
169
170 return 0;
171 }
172
_dsp_pipeline_destroy(struct dsp_pipeline * pipeline)173 static inline void _dsp_pipeline_destroy(struct dsp_pipeline *pipeline)
174 {
175 struct dsp_pipeline_entry *entry, *n;
176
177 list_for_each_entry_safe(entry, n, &pipeline->list, list) {
178 list_del(&entry->list);
179 if (entry->elem == dsp_hwec)
180 dsp_hwec_disable(container_of(pipeline, struct dsp,
181 pipeline));
182 else
183 entry->elem->free(entry->p);
184 kfree(entry);
185 }
186 }
187
dsp_pipeline_destroy(struct dsp_pipeline * pipeline)188 void dsp_pipeline_destroy(struct dsp_pipeline *pipeline)
189 {
190
191 if (!pipeline)
192 return;
193
194 _dsp_pipeline_destroy(pipeline);
195 }
196
dsp_pipeline_build(struct dsp_pipeline * pipeline,const char * cfg)197 int dsp_pipeline_build(struct dsp_pipeline *pipeline, const char *cfg)
198 {
199 int found = 0;
200 char *dup, *next, *tok, *name, *args;
201 struct dsp_element_entry *entry, *n;
202 struct dsp_pipeline_entry *pipeline_entry;
203 struct mISDN_dsp_element *elem;
204
205 if (!pipeline)
206 return -EINVAL;
207
208 if (!list_empty(&pipeline->list))
209 _dsp_pipeline_destroy(pipeline);
210
211 dup = next = kstrdup(cfg, GFP_ATOMIC);
212 if (!dup)
213 return 0;
214 while ((tok = strsep(&next, "|"))) {
215 if (!strlen(tok))
216 continue;
217 name = strsep(&tok, "(");
218 args = strsep(&tok, ")");
219 if (args && !*args)
220 args = NULL;
221
222 list_for_each_entry_safe(entry, n, &dsp_elements, list)
223 if (!strcmp(entry->elem->name, name)) {
224 elem = entry->elem;
225
226 pipeline_entry = kmalloc(sizeof(struct
227 dsp_pipeline_entry), GFP_ATOMIC);
228 if (!pipeline_entry) {
229 printk(KERN_ERR "%s: failed to add "
230 "entry to pipeline: %s (out of "
231 "memory)\n", __func__, elem->name);
232 goto _out;
233 }
234 pipeline_entry->elem = elem;
235
236 if (elem == dsp_hwec) {
237 /* This is a hack to make the hwec
238 available as a pipeline module */
239 dsp_hwec_enable(container_of(pipeline,
240 struct dsp, pipeline), args);
241 list_add_tail(&pipeline_entry->list,
242 &pipeline->list);
243 } else {
244 pipeline_entry->p = elem->new(args);
245 if (pipeline_entry->p) {
246 list_add_tail(&pipeline_entry->
247 list, &pipeline->list);
248 } else {
249 printk(KERN_ERR "%s: failed "
250 "to add entry to pipeline: "
251 "%s (new() returned NULL)\n",
252 __func__, elem->name);
253 kfree(pipeline_entry);
254 }
255 }
256 found = 1;
257 break;
258 }
259
260 if (found)
261 found = 0;
262 else
263 printk(KERN_ERR "%s: element not found, skipping: "
264 "%s\n", __func__, name);
265 }
266
267 _out:
268 if (!list_empty(&pipeline->list))
269 pipeline->inuse = 1;
270 else
271 pipeline->inuse = 0;
272
273 kfree(dup);
274 return 0;
275 }
276
dsp_pipeline_process_tx(struct dsp_pipeline * pipeline,u8 * data,int len)277 void dsp_pipeline_process_tx(struct dsp_pipeline *pipeline, u8 *data, int len)
278 {
279 struct dsp_pipeline_entry *entry;
280
281 if (!pipeline)
282 return;
283
284 list_for_each_entry(entry, &pipeline->list, list)
285 if (entry->elem->process_tx)
286 entry->elem->process_tx(entry->p, data, len);
287 }
288
dsp_pipeline_process_rx(struct dsp_pipeline * pipeline,u8 * data,int len,unsigned int txlen)289 void dsp_pipeline_process_rx(struct dsp_pipeline *pipeline, u8 *data, int len,
290 unsigned int txlen)
291 {
292 struct dsp_pipeline_entry *entry;
293
294 if (!pipeline)
295 return;
296
297 list_for_each_entry_reverse(entry, &pipeline->list, list)
298 if (entry->elem->process_rx)
299 entry->elem->process_rx(entry->p, data, len, txlen);
300 }
301