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 <linux/export.h> 34 #include "dsp.h" 35 #include "dsp_hwec.h" 36 37 /* uncomment for debugging */ 38 /*#define PIPELINE_DEBUG*/ 39 40 struct dsp_pipeline_entry { 41 struct mISDN_dsp_element *elem; 42 void *p; 43 struct list_head list; 44 }; 45 struct dsp_element_entry { 46 struct mISDN_dsp_element *elem; 47 struct device dev; 48 struct list_head list; 49 }; 50 51 static LIST_HEAD(dsp_elements); 52 53 /* sysfs */ 54 static struct class *elements_class; 55 56 static ssize_t 57 attr_show_args(struct device *dev, struct device_attribute *attr, char *buf) 58 { 59 struct mISDN_dsp_element *elem = dev_get_drvdata(dev); 60 int i; 61 char *p = buf; 62 63 *buf = 0; 64 for (i = 0; i < elem->num_args; i++) 65 p += sprintf(p, "Name: %s\n%s%s%sDescription: %s\n\n", 66 elem->args[i].name, 67 elem->args[i].def ? "Default: " : "", 68 elem->args[i].def ? elem->args[i].def : "", 69 elem->args[i].def ? "\n" : "", 70 elem->args[i].desc); 71 72 return p - buf; 73 } 74 75 static struct device_attribute element_attributes[] = { 76 __ATTR(args, 0444, attr_show_args, NULL), 77 }; 78 79 static void 80 mISDN_dsp_dev_release(struct device *dev) 81 { 82 struct dsp_element_entry *entry = 83 container_of(dev, struct dsp_element_entry, dev); 84 list_del(&entry->list); 85 kfree(entry); 86 } 87 88 int mISDN_dsp_element_register(struct mISDN_dsp_element *elem) 89 { 90 struct dsp_element_entry *entry; 91 int ret, i; 92 93 if (!elem) 94 return -EINVAL; 95 96 entry = kzalloc(sizeof(struct dsp_element_entry), GFP_ATOMIC); 97 if (!entry) 98 return -ENOMEM; 99 100 entry->elem = elem; 101 102 entry->dev.class = elements_class; 103 entry->dev.release = mISDN_dsp_dev_release; 104 dev_set_drvdata(&entry->dev, elem); 105 dev_set_name(&entry->dev, "%s", elem->name); 106 ret = device_register(&entry->dev); 107 if (ret) { 108 printk(KERN_ERR "%s: failed to register %s\n", 109 __func__, elem->name); 110 goto err1; 111 } 112 list_add_tail(&entry->list, &dsp_elements); 113 114 for (i = 0; i < ARRAY_SIZE(element_attributes); ++i) { 115 ret = device_create_file(&entry->dev, 116 &element_attributes[i]); 117 if (ret) { 118 printk(KERN_ERR "%s: failed to create device file\n", 119 __func__); 120 goto err2; 121 } 122 } 123 124 #ifdef PIPELINE_DEBUG 125 printk(KERN_DEBUG "%s: %s registered\n", __func__, elem->name); 126 #endif 127 128 return 0; 129 130 err2: 131 device_unregister(&entry->dev); 132 return ret; 133 err1: 134 kfree(entry); 135 return ret; 136 } 137 EXPORT_SYMBOL(mISDN_dsp_element_register); 138 139 void mISDN_dsp_element_unregister(struct mISDN_dsp_element *elem) 140 { 141 struct dsp_element_entry *entry, *n; 142 143 if (!elem) 144 return; 145 146 list_for_each_entry_safe(entry, n, &dsp_elements, list) 147 if (entry->elem == elem) { 148 device_unregister(&entry->dev); 149 #ifdef PIPELINE_DEBUG 150 printk(KERN_DEBUG "%s: %s unregistered\n", 151 __func__, elem->name); 152 #endif 153 return; 154 } 155 printk(KERN_ERR "%s: element %s not in list.\n", __func__, elem->name); 156 } 157 EXPORT_SYMBOL(mISDN_dsp_element_unregister); 158 159 int dsp_pipeline_module_init(void) 160 { 161 elements_class = class_create(THIS_MODULE, "dsp_pipeline"); 162 if (IS_ERR(elements_class)) 163 return PTR_ERR(elements_class); 164 165 #ifdef PIPELINE_DEBUG 166 printk(KERN_DEBUG "%s: dsp pipeline module initialized\n", __func__); 167 #endif 168 169 dsp_hwec_init(); 170 171 return 0; 172 } 173 174 void dsp_pipeline_module_exit(void) 175 { 176 struct dsp_element_entry *entry, *n; 177 178 dsp_hwec_exit(); 179 180 class_destroy(elements_class); 181 182 list_for_each_entry_safe(entry, n, &dsp_elements, list) { 183 list_del(&entry->list); 184 printk(KERN_WARNING "%s: element was still registered: %s\n", 185 __func__, entry->elem->name); 186 kfree(entry); 187 } 188 189 #ifdef PIPELINE_DEBUG 190 printk(KERN_DEBUG "%s: dsp pipeline module exited\n", __func__); 191 #endif 192 } 193 194 int dsp_pipeline_init(struct dsp_pipeline *pipeline) 195 { 196 if (!pipeline) 197 return -EINVAL; 198 199 INIT_LIST_HEAD(&pipeline->list); 200 201 #ifdef PIPELINE_DEBUG 202 printk(KERN_DEBUG "%s: dsp pipeline ready\n", __func__); 203 #endif 204 205 return 0; 206 } 207 208 static inline void _dsp_pipeline_destroy(struct dsp_pipeline *pipeline) 209 { 210 struct dsp_pipeline_entry *entry, *n; 211 212 list_for_each_entry_safe(entry, n, &pipeline->list, list) { 213 list_del(&entry->list); 214 if (entry->elem == dsp_hwec) 215 dsp_hwec_disable(container_of(pipeline, struct dsp, 216 pipeline)); 217 else 218 entry->elem->free(entry->p); 219 kfree(entry); 220 } 221 } 222 223 void dsp_pipeline_destroy(struct dsp_pipeline *pipeline) 224 { 225 226 if (!pipeline) 227 return; 228 229 _dsp_pipeline_destroy(pipeline); 230 231 #ifdef PIPELINE_DEBUG 232 printk(KERN_DEBUG "%s: dsp pipeline destroyed\n", __func__); 233 #endif 234 } 235 236 int dsp_pipeline_build(struct dsp_pipeline *pipeline, const char *cfg) 237 { 238 int incomplete = 0, found = 0; 239 char *dup, *tok, *name, *args; 240 struct dsp_element_entry *entry, *n; 241 struct dsp_pipeline_entry *pipeline_entry; 242 struct mISDN_dsp_element *elem; 243 244 if (!pipeline) 245 return -EINVAL; 246 247 if (!list_empty(&pipeline->list)) 248 _dsp_pipeline_destroy(pipeline); 249 250 dup = kstrdup(cfg, GFP_ATOMIC); 251 if (!dup) 252 return 0; 253 while ((tok = strsep(&dup, "|"))) { 254 if (!strlen(tok)) 255 continue; 256 name = strsep(&tok, "("); 257 args = strsep(&tok, ")"); 258 if (args && !*args) 259 args = NULL; 260 261 list_for_each_entry_safe(entry, n, &dsp_elements, list) 262 if (!strcmp(entry->elem->name, name)) { 263 elem = entry->elem; 264 265 pipeline_entry = kmalloc(sizeof(struct 266 dsp_pipeline_entry), GFP_ATOMIC); 267 if (!pipeline_entry) { 268 printk(KERN_ERR "%s: failed to add " 269 "entry to pipeline: %s (out of " 270 "memory)\n", __func__, elem->name); 271 incomplete = 1; 272 goto _out; 273 } 274 pipeline_entry->elem = elem; 275 276 if (elem == dsp_hwec) { 277 /* This is a hack to make the hwec 278 available as a pipeline module */ 279 dsp_hwec_enable(container_of(pipeline, 280 struct dsp, pipeline), args); 281 list_add_tail(&pipeline_entry->list, 282 &pipeline->list); 283 } else { 284 pipeline_entry->p = elem->new(args); 285 if (pipeline_entry->p) { 286 list_add_tail(&pipeline_entry-> 287 list, &pipeline->list); 288 #ifdef PIPELINE_DEBUG 289 printk(KERN_DEBUG "%s: created " 290 "instance of %s%s%s\n", 291 __func__, name, args ? 292 " with args " : "", args ? 293 args : ""); 294 #endif 295 } else { 296 printk(KERN_ERR "%s: failed " 297 "to add entry to pipeline: " 298 "%s (new() returned NULL)\n", 299 __func__, elem->name); 300 kfree(pipeline_entry); 301 incomplete = 1; 302 } 303 } 304 found = 1; 305 break; 306 } 307 308 if (found) 309 found = 0; 310 else { 311 printk(KERN_ERR "%s: element not found, skipping: " 312 "%s\n", __func__, name); 313 incomplete = 1; 314 } 315 } 316 317 _out: 318 if (!list_empty(&pipeline->list)) 319 pipeline->inuse = 1; 320 else 321 pipeline->inuse = 0; 322 323 #ifdef PIPELINE_DEBUG 324 printk(KERN_DEBUG "%s: dsp pipeline built%s: %s\n", 325 __func__, incomplete ? " incomplete" : "", cfg); 326 #endif 327 kfree(dup); 328 return 0; 329 } 330 331 void dsp_pipeline_process_tx(struct dsp_pipeline *pipeline, u8 *data, int len) 332 { 333 struct dsp_pipeline_entry *entry; 334 335 if (!pipeline) 336 return; 337 338 list_for_each_entry(entry, &pipeline->list, list) 339 if (entry->elem->process_tx) 340 entry->elem->process_tx(entry->p, data, len); 341 } 342 343 void dsp_pipeline_process_rx(struct dsp_pipeline *pipeline, u8 *data, int len, 344 unsigned int txlen) 345 { 346 struct dsp_pipeline_entry *entry; 347 348 if (!pipeline) 349 return; 350 351 list_for_each_entry_reverse(entry, &pipeline->list, list) 352 if (entry->elem->process_rx) 353 entry->elem->process_rx(entry->p, data, len, txlen); 354 } 355