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 struct class *elements_class;
35
36 static ssize_t
attr_show_args(struct device * dev,struct device_attribute * attr,char * buf)37 attr_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
55 static struct device_attribute element_attributes[] = {
56 __ATTR(args, 0444, attr_show_args, NULL),
57 };
58
59 static void
mISDN_dsp_dev_release(struct device * dev)60 mISDN_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
mISDN_dsp_element_register(struct mISDN_dsp_element * elem)68 int 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
107 err2:
108 device_unregister(&entry->dev);
109 return ret;
110 err1:
111 put_device(&entry->dev);
112 return ret;
113 }
114 EXPORT_SYMBOL(mISDN_dsp_element_register);
115
mISDN_dsp_element_unregister(struct mISDN_dsp_element * elem)116 void 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 }
130 EXPORT_SYMBOL(mISDN_dsp_element_unregister);
131
dsp_pipeline_module_init(void)132 int dsp_pipeline_module_init(void)
133 {
134 elements_class = class_create(THIS_MODULE, "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
dsp_pipeline_module_exit(void)143 void 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
dsp_pipeline_init(struct dsp_pipeline * pipeline)159 int 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
_dsp_pipeline_destroy(struct dsp_pipeline * pipeline)169 static 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
dsp_pipeline_destroy(struct dsp_pipeline * pipeline)184 void dsp_pipeline_destroy(struct dsp_pipeline *pipeline)
185 {
186
187 if (!pipeline)
188 return;
189
190 _dsp_pipeline_destroy(pipeline);
191 }
192
dsp_pipeline_build(struct dsp_pipeline * pipeline,const char * cfg)193 int 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
dsp_pipeline_process_tx(struct dsp_pipeline * pipeline,u8 * data,int len)273 void 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
dsp_pipeline_process_rx(struct dsp_pipeline * pipeline,u8 * data,int len,unsigned int txlen)285 void 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 }
297