summaryrefslogtreecommitdiff
path: root/drivers/isdn/mISDN/dsp_pipeline.c
blob: e11ca6bbc7f41d559ace1fabfa1f0527b7e32318 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
// SPDX-License-Identifier: GPL-2.0-or-later
/*
 * dsp_pipeline.c: pipelined audio processing
 *
 * Copyright (C) 2007, Nadi Sarrar
 *
 * Nadi Sarrar <nadi@beronet.com>
 */

#include <linux/kernel.h>
#include <linux/slab.h>
#include <linux/list.h>
#include <linux/string.h>
#include <linux/mISDNif.h>
#include <linux/mISDNdsp.h>
#include <linux/export.h>
#include "dsp.h"
#include "dsp_hwec.h"

struct dsp_pipeline_entry {
	struct mISDN_dsp_element *elem;
	void                *p;
	struct list_head     list;
};
struct dsp_element_entry {
	struct mISDN_dsp_element *elem;
	struct device	     dev;
	struct list_head     list;
};

static LIST_HEAD(dsp_elements);

/* sysfs */
static struct class *elements_class;

static ssize_t
attr_show_args(struct device *dev, struct device_attribute *attr, char *buf)
{
	struct mISDN_dsp_element *elem = dev_get_drvdata(dev);
	int i;
	char *p = buf;

	*buf = 0;
	for (i = 0; i < elem->num_args; i++)
		p += sprintf(p, "Name:        %s\n%s%s%sDescription: %s\n\n",
			     elem->args[i].name,
			     elem->args[i].def ? "Default:     " : "",
			     elem->args[i].def ? elem->args[i].def : "",
			     elem->args[i].def ? "\n" : "",
			     elem->args[i].desc);

	return p - buf;
}

static struct device_attribute element_attributes[] = {
	__ATTR(args, 0444, attr_show_args, NULL),
};

static void
mISDN_dsp_dev_release(struct device *dev)
{
	struct dsp_element_entry *entry =
		container_of(dev, struct dsp_element_entry, dev);
	list_del(&entry->list);
	kfree(entry);
}

int mISDN_dsp_element_register(struct mISDN_dsp_element *elem)
{
	struct dsp_element_entry *entry;
	int ret, i;

	if (!elem)
		return -EINVAL;

	entry = kzalloc(sizeof(struct dsp_element_entry), GFP_ATOMIC);
	if (!entry)
		return -ENOMEM;

	entry->elem = elem;

	entry->dev.class = elements_class;
	entry->dev.release = mISDN_dsp_dev_release;
	dev_set_drvdata(&entry->dev, elem);
	dev_set_name(&entry->dev, "%s", elem->name);
	ret = device_register(&entry->dev);
	if (ret) {
		printk(KERN_ERR "%s: failed to register %s\n",
		       __func__, elem->name);
		goto err1;
	}
	list_add_tail(&entry->list, &dsp_elements);

	for (i = 0; i < ARRAY_SIZE(element_attributes); ++i) {
		ret = device_create_file(&entry->dev,
					 &element_attributes[i]);
		if (ret) {
			printk(KERN_ERR "%s: failed to create device file\n",
			       __func__);
			goto err2;
		}
	}

	return 0;

err2:
	device_unregister(&entry->dev);
	return ret;
err1:
	kfree(entry);
	return ret;
}
EXPORT_SYMBOL(mISDN_dsp_element_register);

void mISDN_dsp_element_unregister(struct mISDN_dsp_element *elem)
{
	struct dsp_element_entry *entry, *n;

	if (!elem)
		return;

	list_for_each_entry_safe(entry, n, &dsp_elements, list)
		if (entry->elem == elem) {
			device_unregister(&entry->dev);
			return;
		}
	printk(KERN_ERR "%s: element %s not in list.\n", __func__, elem->name);
}
EXPORT_SYMBOL(mISDN_dsp_element_unregister);

int dsp_pipeline_module_init(void)
{
	elements_class = class_create(THIS_MODULE, "dsp_pipeline");
	if (IS_ERR(elements_class))
		return PTR_ERR(elements_class);

	dsp_hwec_init();

	return 0;
}

void dsp_pipeline_module_exit(void)
{
	struct dsp_element_entry *entry, *n;

	dsp_hwec_exit();

	class_destroy(elements_class);

	list_for_each_entry_safe(entry, n, &dsp_elements, list) {
		list_del(&entry->list);
		printk(KERN_WARNING "%s: element was still registered: %s\n",
		       __func__, entry->elem->name);
		kfree(entry);
	}
}

int dsp_pipeline_init(struct dsp_pipeline *pipeline)
{
	if (!pipeline)
		return -EINVAL;

	INIT_LIST_HEAD(&pipeline->list);

	return 0;
}

static inline void _dsp_pipeline_destroy(struct dsp_pipeline *pipeline)
{
	struct dsp_pipeline_entry *entry, *n;

	list_for_each_entry_safe(entry, n, &pipeline->list, list) {
		list_del(&entry->list);
		if (entry->elem == dsp_hwec)
			dsp_hwec_disable(container_of(pipeline, struct dsp,
						      pipeline));
		else
			entry->elem->free(entry->p);
		kfree(entry);
	}
}

void dsp_pipeline_destroy(struct dsp_pipeline *pipeline)
{

	if (!pipeline)
		return;

	_dsp_pipeline_destroy(pipeline);
}

int dsp_pipeline_build(struct dsp_pipeline *pipeline, const char *cfg)
{
	int found = 0;
	char *dup, *tok, *name, *args;
	struct dsp_element_entry *entry, *n;
	struct dsp_pipeline_entry *pipeline_entry;
	struct mISDN_dsp_element *elem;

	if (!pipeline)
		return -EINVAL;

	if (!list_empty(&pipeline->list))
		_dsp_pipeline_destroy(pipeline);

	dup = kstrdup(cfg, GFP_ATOMIC);
	if (!dup)
		return 0;
	while ((tok = strsep(&dup, "|"))) {
		if (!strlen(tok))
			continue;
		name = strsep(&tok, "(");
		args = strsep(&tok, ")");
		if (args && !*args)
			args = NULL;

		list_for_each_entry_safe(entry, n, &dsp_elements, list)
			if (!strcmp(entry->elem->name, name)) {
				elem = entry->elem;

				pipeline_entry = kmalloc(sizeof(struct
								dsp_pipeline_entry), GFP_ATOMIC);
				if (!pipeline_entry) {
					printk(KERN_ERR "%s: failed to add "
					       "entry to pipeline: %s (out of "
					       "memory)\n", __func__, elem->name);
					goto _out;
				}
				pipeline_entry->elem = elem;

				if (elem == dsp_hwec) {
					/* This is a hack to make the hwec
					   available as a pipeline module */
					dsp_hwec_enable(container_of(pipeline,
								     struct dsp, pipeline), args);
					list_add_tail(&pipeline_entry->list,
						      &pipeline->list);
				} else {
					pipeline_entry->p = elem->new(args);
					if (pipeline_entry->p) {
						list_add_tail(&pipeline_entry->
							      list, &pipeline->list);
					} else {
						printk(KERN_ERR "%s: failed "
						       "to add entry to pipeline: "
						       "%s (new() returned NULL)\n",
						       __func__, elem->name);
						kfree(pipeline_entry);
					}
				}
				found = 1;
				break;
			}

		if (found)
			found = 0;
		else
			printk(KERN_ERR "%s: element not found, skipping: "
			       "%s\n", __func__, name);
	}

_out:
	if (!list_empty(&pipeline->list))
		pipeline->inuse = 1;
	else
		pipeline->inuse = 0;

	kfree(dup);
	return 0;
}

void dsp_pipeline_process_tx(struct dsp_pipeline *pipeline, u8 *data, int len)
{
	struct dsp_pipeline_entry *entry;

	if (!pipeline)
		return;

	list_for_each_entry(entry, &pipeline->list, list)
		if (entry->elem->process_tx)
			entry->elem->process_tx(entry->p, data, len);
}

void dsp_pipeline_process_rx(struct dsp_pipeline *pipeline, u8 *data, int len,
			     unsigned int txlen)
{
	struct dsp_pipeline_entry *entry;

	if (!pipeline)
		return;

	list_for_each_entry_reverse(entry, &pipeline->list, list)
		if (entry->elem->process_rx)
			entry->elem->process_rx(entry->p, data, len, txlen);
}