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 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 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 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 entry->elem = elem; 81 82 entry->dev.class = elements_class; 83 entry->dev.release = mISDN_dsp_dev_release; 84 dev_set_drvdata(&entry->dev, elem); 85 dev_set_name(&entry->dev, "%s", elem->name); 86 ret = device_register(&entry->dev); 87 if (ret) { 88 printk(KERN_ERR "%s: failed to register %s\n", 89 __func__, elem->name); 90 goto err1; 91 } 92 list_add_tail(&entry->list, &dsp_elements); 93 94 for (i = 0; i < ARRAY_SIZE(element_attributes); ++i) { 95 ret = device_create_file(&entry->dev, 96 &element_attributes[i]); 97 if (ret) { 98 printk(KERN_ERR "%s: failed to create device file\n", 99 __func__); 100 goto err2; 101 } 102 } 103 104 return 0; 105 106 err2: 107 device_unregister(&entry->dev); 108 return ret; 109 err1: 110 kfree(entry); 111 return ret; 112 } 113 EXPORT_SYMBOL(mISDN_dsp_element_register); 114 115 void mISDN_dsp_element_unregister(struct mISDN_dsp_element *elem) 116 { 117 struct dsp_element_entry *entry, *n; 118 119 if (!elem) 120 return; 121 122 list_for_each_entry_safe(entry, n, &dsp_elements, list) 123 if (entry->elem == elem) { 124 device_unregister(&entry->dev); 125 return; 126 } 127 printk(KERN_ERR "%s: element %s not in list.\n", __func__, elem->name); 128 } 129 EXPORT_SYMBOL(mISDN_dsp_element_unregister); 130 131 int dsp_pipeline_module_init(void) 132 { 133 elements_class = class_create(THIS_MODULE, "dsp_pipeline"); 134 if (IS_ERR(elements_class)) 135 return PTR_ERR(elements_class); 136 137 dsp_hwec_init(); 138 139 return 0; 140 } 141 142 void dsp_pipeline_module_exit(void) 143 { 144 struct dsp_element_entry *entry, *n; 145 146 dsp_hwec_exit(); 147 148 class_destroy(elements_class); 149 150 list_for_each_entry_safe(entry, n, &dsp_elements, list) { 151 list_del(&entry->list); 152 printk(KERN_WARNING "%s: element was still registered: %s\n", 153 __func__, entry->elem->name); 154 kfree(entry); 155 } 156 } 157 158 int dsp_pipeline_init(struct dsp_pipeline *pipeline) 159 { 160 if (!pipeline) 161 return -EINVAL; 162 163 INIT_LIST_HEAD(&pipeline->list); 164 165 return 0; 166 } 167 168 static inline void _dsp_pipeline_destroy(struct dsp_pipeline *pipeline) 169 { 170 struct dsp_pipeline_entry *entry, *n; 171 172 list_for_each_entry_safe(entry, n, &pipeline->list, list) { 173 list_del(&entry->list); 174 if (entry->elem == dsp_hwec) 175 dsp_hwec_disable(container_of(pipeline, struct dsp, 176 pipeline)); 177 else 178 entry->elem->free(entry->p); 179 kfree(entry); 180 } 181 } 182 183 void dsp_pipeline_destroy(struct dsp_pipeline *pipeline) 184 { 185 186 if (!pipeline) 187 return; 188 189 _dsp_pipeline_destroy(pipeline); 190 } 191 192 int dsp_pipeline_build(struct dsp_pipeline *pipeline, const char *cfg) 193 { 194 int found = 0; 195 char *dup, *tok, *name, *args; 196 struct dsp_element_entry *entry, *n; 197 struct dsp_pipeline_entry *pipeline_entry; 198 struct mISDN_dsp_element *elem; 199 200 if (!pipeline) 201 return -EINVAL; 202 203 if (!list_empty(&pipeline->list)) 204 _dsp_pipeline_destroy(pipeline); 205 206 dup = kstrdup(cfg, GFP_ATOMIC); 207 if (!dup) 208 return 0; 209 while ((tok = strsep(&dup, "|"))) { 210 if (!strlen(tok)) 211 continue; 212 name = strsep(&tok, "("); 213 args = strsep(&tok, ")"); 214 if (args && !*args) 215 args = NULL; 216 217 list_for_each_entry_safe(entry, n, &dsp_elements, list) 218 if (!strcmp(entry->elem->name, name)) { 219 elem = entry->elem; 220 221 pipeline_entry = kmalloc(sizeof(struct 222 dsp_pipeline_entry), GFP_ATOMIC); 223 if (!pipeline_entry) { 224 printk(KERN_ERR "%s: failed to add " 225 "entry to pipeline: %s (out of " 226 "memory)\n", __func__, elem->name); 227 goto _out; 228 } 229 pipeline_entry->elem = elem; 230 231 if (elem == dsp_hwec) { 232 /* This is a hack to make the hwec 233 available as a pipeline module */ 234 dsp_hwec_enable(container_of(pipeline, 235 struct dsp, pipeline), args); 236 list_add_tail(&pipeline_entry->list, 237 &pipeline->list); 238 } else { 239 pipeline_entry->p = elem->new(args); 240 if (pipeline_entry->p) { 241 list_add_tail(&pipeline_entry-> 242 list, &pipeline->list); 243 } else { 244 printk(KERN_ERR "%s: failed " 245 "to add entry to pipeline: " 246 "%s (new() returned NULL)\n", 247 __func__, elem->name); 248 kfree(pipeline_entry); 249 } 250 } 251 found = 1; 252 break; 253 } 254 255 if (found) 256 found = 0; 257 else 258 printk(KERN_ERR "%s: element not found, skipping: " 259 "%s\n", __func__, name); 260 } 261 262 _out: 263 if (!list_empty(&pipeline->list)) 264 pipeline->inuse = 1; 265 else 266 pipeline->inuse = 0; 267 268 kfree(dup); 269 return 0; 270 } 271 272 void dsp_pipeline_process_tx(struct dsp_pipeline *pipeline, u8 *data, int len) 273 { 274 struct dsp_pipeline_entry *entry; 275 276 if (!pipeline) 277 return; 278 279 list_for_each_entry(entry, &pipeline->list, list) 280 if (entry->elem->process_tx) 281 entry->elem->process_tx(entry->p, data, len); 282 } 283 284 void dsp_pipeline_process_rx(struct dsp_pipeline *pipeline, u8 *data, int len, 285 unsigned int txlen) 286 { 287 struct dsp_pipeline_entry *entry; 288 289 if (!pipeline) 290 return; 291 292 list_for_each_entry_reverse(entry, &pipeline->list, list) 293 if (entry->elem->process_rx) 294 entry->elem->process_rx(entry->p, data, len, txlen); 295 } 296