1 /* 2 * Copyright (C) 2005-2006 Micronas USA Inc. 3 * 4 * This program is free software; you can redistribute it and/or modify 5 * it under the terms of the GNU General Public License (Version 2) as 6 * published by the Free Software Foundation. 7 * 8 * This program is distributed in the hope that it will be useful, 9 * but WITHOUT ANY WARRANTY; without even the implied warranty of 10 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 11 * GNU General Public License for more details. 12 */ 13 14 #include <linux/kernel.h> 15 #include <linux/module.h> 16 #include <linux/moduleparam.h> 17 #include <linux/spinlock.h> 18 #include <linux/delay.h> 19 #include <linux/sched.h> 20 #include <linux/vmalloc.h> 21 #include <linux/time.h> 22 #include <linux/mm.h> 23 #include <linux/i2c.h> 24 #include <linux/mutex.h> 25 #include <linux/uaccess.h> 26 #include <linux/slab.h> 27 #include <sound/core.h> 28 #include <sound/pcm.h> 29 #include <sound/initval.h> 30 31 #include "go7007-priv.h" 32 33 static int index[SNDRV_CARDS] = SNDRV_DEFAULT_IDX; 34 static char *id[SNDRV_CARDS] = SNDRV_DEFAULT_STR; 35 static bool enable[SNDRV_CARDS] = SNDRV_DEFAULT_ENABLE_PNP; 36 37 module_param_array(index, int, NULL, 0444); 38 module_param_array(id, charp, NULL, 0444); 39 module_param_array(enable, bool, NULL, 0444); 40 MODULE_PARM_DESC(index, "Index value for the go7007 audio driver"); 41 MODULE_PARM_DESC(id, "ID string for the go7007 audio driver"); 42 MODULE_PARM_DESC(enable, "Enable for the go7007 audio driver"); 43 44 struct go7007_snd { 45 struct snd_card *card; 46 struct snd_pcm *pcm; 47 struct snd_pcm_substream *substream; 48 spinlock_t lock; 49 int w_idx; 50 int hw_ptr; 51 int avail; 52 int capturing; 53 }; 54 55 static const struct snd_pcm_hardware go7007_snd_capture_hw = { 56 .info = (SNDRV_PCM_INFO_MMAP | 57 SNDRV_PCM_INFO_INTERLEAVED | 58 SNDRV_PCM_INFO_BLOCK_TRANSFER | 59 SNDRV_PCM_INFO_MMAP_VALID), 60 .formats = SNDRV_PCM_FMTBIT_S16_LE, 61 .rates = SNDRV_PCM_RATE_48000, 62 .rate_min = 48000, 63 .rate_max = 48000, 64 .channels_min = 2, 65 .channels_max = 2, 66 .buffer_bytes_max = (128*1024), 67 .period_bytes_min = 4096, 68 .period_bytes_max = (128*1024), 69 .periods_min = 1, 70 .periods_max = 32, 71 }; 72 73 static void parse_audio_stream_data(struct go7007 *go, u8 *buf, int length) 74 { 75 struct go7007_snd *gosnd = go->snd_context; 76 struct snd_pcm_runtime *runtime = gosnd->substream->runtime; 77 int frames = bytes_to_frames(runtime, length); 78 unsigned long flags; 79 80 spin_lock_irqsave(&gosnd->lock, flags); 81 gosnd->hw_ptr += frames; 82 if (gosnd->hw_ptr >= runtime->buffer_size) 83 gosnd->hw_ptr -= runtime->buffer_size; 84 gosnd->avail += frames; 85 spin_unlock_irqrestore(&gosnd->lock, flags); 86 if (gosnd->w_idx + length > runtime->dma_bytes) { 87 int cpy = runtime->dma_bytes - gosnd->w_idx; 88 89 memcpy(runtime->dma_area + gosnd->w_idx, buf, cpy); 90 length -= cpy; 91 buf += cpy; 92 gosnd->w_idx = 0; 93 } 94 memcpy(runtime->dma_area + gosnd->w_idx, buf, length); 95 gosnd->w_idx += length; 96 spin_lock_irqsave(&gosnd->lock, flags); 97 if (gosnd->avail < runtime->period_size) { 98 spin_unlock_irqrestore(&gosnd->lock, flags); 99 return; 100 } 101 gosnd->avail -= runtime->period_size; 102 spin_unlock_irqrestore(&gosnd->lock, flags); 103 if (gosnd->capturing) 104 snd_pcm_period_elapsed(gosnd->substream); 105 } 106 107 static int go7007_snd_hw_params(struct snd_pcm_substream *substream, 108 struct snd_pcm_hw_params *hw_params) 109 { 110 struct go7007 *go = snd_pcm_substream_chip(substream); 111 unsigned int bytes; 112 113 bytes = params_buffer_bytes(hw_params); 114 if (substream->runtime->dma_bytes > 0) 115 vfree(substream->runtime->dma_area); 116 substream->runtime->dma_bytes = 0; 117 substream->runtime->dma_area = vmalloc(bytes); 118 if (substream->runtime->dma_area == NULL) 119 return -ENOMEM; 120 substream->runtime->dma_bytes = bytes; 121 go->audio_deliver = parse_audio_stream_data; 122 return 0; 123 } 124 125 static int go7007_snd_hw_free(struct snd_pcm_substream *substream) 126 { 127 struct go7007 *go = snd_pcm_substream_chip(substream); 128 129 go->audio_deliver = NULL; 130 if (substream->runtime->dma_bytes > 0) 131 vfree(substream->runtime->dma_area); 132 substream->runtime->dma_bytes = 0; 133 return 0; 134 } 135 136 static int go7007_snd_capture_open(struct snd_pcm_substream *substream) 137 { 138 struct go7007 *go = snd_pcm_substream_chip(substream); 139 struct go7007_snd *gosnd = go->snd_context; 140 unsigned long flags; 141 int r; 142 143 spin_lock_irqsave(&gosnd->lock, flags); 144 if (gosnd->substream == NULL) { 145 gosnd->substream = substream; 146 substream->runtime->hw = go7007_snd_capture_hw; 147 r = 0; 148 } else 149 r = -EBUSY; 150 spin_unlock_irqrestore(&gosnd->lock, flags); 151 return r; 152 } 153 154 static int go7007_snd_capture_close(struct snd_pcm_substream *substream) 155 { 156 struct go7007 *go = snd_pcm_substream_chip(substream); 157 struct go7007_snd *gosnd = go->snd_context; 158 159 gosnd->substream = NULL; 160 return 0; 161 } 162 163 static int go7007_snd_pcm_prepare(struct snd_pcm_substream *substream) 164 { 165 return 0; 166 } 167 168 static int go7007_snd_pcm_trigger(struct snd_pcm_substream *substream, int cmd) 169 { 170 struct go7007 *go = snd_pcm_substream_chip(substream); 171 struct go7007_snd *gosnd = go->snd_context; 172 173 switch (cmd) { 174 case SNDRV_PCM_TRIGGER_START: 175 /* Just set a flag to indicate we should signal ALSA when 176 * sound comes in */ 177 gosnd->capturing = 1; 178 return 0; 179 case SNDRV_PCM_TRIGGER_STOP: 180 gosnd->hw_ptr = gosnd->w_idx = gosnd->avail = 0; 181 gosnd->capturing = 0; 182 return 0; 183 default: 184 return -EINVAL; 185 } 186 } 187 188 static snd_pcm_uframes_t go7007_snd_pcm_pointer(struct snd_pcm_substream *substream) 189 { 190 struct go7007 *go = snd_pcm_substream_chip(substream); 191 struct go7007_snd *gosnd = go->snd_context; 192 193 return gosnd->hw_ptr; 194 } 195 196 static struct page *go7007_snd_pcm_page(struct snd_pcm_substream *substream, 197 unsigned long offset) 198 { 199 return vmalloc_to_page(substream->runtime->dma_area + offset); 200 } 201 202 static const struct snd_pcm_ops go7007_snd_capture_ops = { 203 .open = go7007_snd_capture_open, 204 .close = go7007_snd_capture_close, 205 .ioctl = snd_pcm_lib_ioctl, 206 .hw_params = go7007_snd_hw_params, 207 .hw_free = go7007_snd_hw_free, 208 .prepare = go7007_snd_pcm_prepare, 209 .trigger = go7007_snd_pcm_trigger, 210 .pointer = go7007_snd_pcm_pointer, 211 .page = go7007_snd_pcm_page, 212 }; 213 214 static int go7007_snd_free(struct snd_device *device) 215 { 216 struct go7007 *go = device->device_data; 217 218 kfree(go->snd_context); 219 go->snd_context = NULL; 220 return 0; 221 } 222 223 static struct snd_device_ops go7007_snd_device_ops = { 224 .dev_free = go7007_snd_free, 225 }; 226 227 int go7007_snd_init(struct go7007 *go) 228 { 229 static int dev; 230 struct go7007_snd *gosnd; 231 int ret; 232 233 if (dev >= SNDRV_CARDS) 234 return -ENODEV; 235 if (!enable[dev]) { 236 dev++; 237 return -ENOENT; 238 } 239 gosnd = kmalloc(sizeof(struct go7007_snd), GFP_KERNEL); 240 if (gosnd == NULL) 241 return -ENOMEM; 242 spin_lock_init(&gosnd->lock); 243 gosnd->hw_ptr = gosnd->w_idx = gosnd->avail = 0; 244 gosnd->capturing = 0; 245 ret = snd_card_new(go->dev, index[dev], id[dev], THIS_MODULE, 0, 246 &gosnd->card); 247 if (ret < 0) { 248 kfree(gosnd); 249 return ret; 250 } 251 ret = snd_device_new(gosnd->card, SNDRV_DEV_LOWLEVEL, go, 252 &go7007_snd_device_ops); 253 if (ret < 0) { 254 kfree(gosnd); 255 return ret; 256 } 257 ret = snd_pcm_new(gosnd->card, "go7007", 0, 0, 1, &gosnd->pcm); 258 if (ret < 0) { 259 snd_card_free(gosnd->card); 260 kfree(gosnd); 261 return ret; 262 } 263 strlcpy(gosnd->card->driver, "go7007", sizeof(gosnd->card->driver)); 264 strlcpy(gosnd->card->shortname, go->name, sizeof(gosnd->card->driver)); 265 strlcpy(gosnd->card->longname, gosnd->card->shortname, 266 sizeof(gosnd->card->longname)); 267 268 gosnd->pcm->private_data = go; 269 snd_pcm_set_ops(gosnd->pcm, SNDRV_PCM_STREAM_CAPTURE, 270 &go7007_snd_capture_ops); 271 272 ret = snd_card_register(gosnd->card); 273 if (ret < 0) { 274 snd_card_free(gosnd->card); 275 kfree(gosnd); 276 return ret; 277 } 278 279 gosnd->substream = NULL; 280 go->snd_context = gosnd; 281 v4l2_device_get(&go->v4l2_dev); 282 ++dev; 283 284 return 0; 285 } 286 EXPORT_SYMBOL(go7007_snd_init); 287 288 int go7007_snd_remove(struct go7007 *go) 289 { 290 struct go7007_snd *gosnd = go->snd_context; 291 292 snd_card_disconnect(gosnd->card); 293 snd_card_free_when_closed(gosnd->card); 294 v4l2_device_put(&go->v4l2_dev); 295 return 0; 296 } 297 EXPORT_SYMBOL(go7007_snd_remove); 298 299 MODULE_LICENSE("GPL v2"); 300