1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * Copyright (C) 2005-2006 Micronas USA Inc. 4 */ 5 6 #include <linux/kernel.h> 7 #include <linux/module.h> 8 #include <linux/moduleparam.h> 9 #include <linux/spinlock.h> 10 #include <linux/delay.h> 11 #include <linux/sched.h> 12 #include <linux/vmalloc.h> 13 #include <linux/time.h> 14 #include <linux/mm.h> 15 #include <linux/i2c.h> 16 #include <linux/mutex.h> 17 #include <linux/uaccess.h> 18 #include <linux/slab.h> 19 #include <sound/core.h> 20 #include <sound/pcm.h> 21 #include <sound/initval.h> 22 23 #include "go7007-priv.h" 24 25 static int index[SNDRV_CARDS] = SNDRV_DEFAULT_IDX; 26 static char *id[SNDRV_CARDS] = SNDRV_DEFAULT_STR; 27 static bool enable[SNDRV_CARDS] = SNDRV_DEFAULT_ENABLE_PNP; 28 29 module_param_array(index, int, NULL, 0444); 30 module_param_array(id, charp, NULL, 0444); 31 module_param_array(enable, bool, NULL, 0444); 32 MODULE_PARM_DESC(index, "Index value for the go7007 audio driver"); 33 MODULE_PARM_DESC(id, "ID string for the go7007 audio driver"); 34 MODULE_PARM_DESC(enable, "Enable for the go7007 audio driver"); 35 36 struct go7007_snd { 37 struct snd_card *card; 38 struct snd_pcm *pcm; 39 struct snd_pcm_substream *substream; 40 spinlock_t lock; 41 int w_idx; 42 int hw_ptr; 43 int avail; 44 int capturing; 45 }; 46 47 static const struct snd_pcm_hardware go7007_snd_capture_hw = { 48 .info = (SNDRV_PCM_INFO_MMAP | 49 SNDRV_PCM_INFO_INTERLEAVED | 50 SNDRV_PCM_INFO_BLOCK_TRANSFER | 51 SNDRV_PCM_INFO_MMAP_VALID), 52 .formats = SNDRV_PCM_FMTBIT_S16_LE, 53 .rates = SNDRV_PCM_RATE_48000, 54 .rate_min = 48000, 55 .rate_max = 48000, 56 .channels_min = 2, 57 .channels_max = 2, 58 .buffer_bytes_max = (128*1024), 59 .period_bytes_min = 4096, 60 .period_bytes_max = (128*1024), 61 .periods_min = 1, 62 .periods_max = 32, 63 }; 64 65 static void parse_audio_stream_data(struct go7007 *go, u8 *buf, int length) 66 { 67 struct go7007_snd *gosnd = go->snd_context; 68 struct snd_pcm_runtime *runtime = gosnd->substream->runtime; 69 int frames = bytes_to_frames(runtime, length); 70 unsigned long flags; 71 72 spin_lock_irqsave(&gosnd->lock, flags); 73 gosnd->hw_ptr += frames; 74 if (gosnd->hw_ptr >= runtime->buffer_size) 75 gosnd->hw_ptr -= runtime->buffer_size; 76 gosnd->avail += frames; 77 spin_unlock_irqrestore(&gosnd->lock, flags); 78 if (gosnd->w_idx + length > runtime->dma_bytes) { 79 int cpy = runtime->dma_bytes - gosnd->w_idx; 80 81 memcpy(runtime->dma_area + gosnd->w_idx, buf, cpy); 82 length -= cpy; 83 buf += cpy; 84 gosnd->w_idx = 0; 85 } 86 memcpy(runtime->dma_area + gosnd->w_idx, buf, length); 87 gosnd->w_idx += length; 88 spin_lock_irqsave(&gosnd->lock, flags); 89 if (gosnd->avail < runtime->period_size) { 90 spin_unlock_irqrestore(&gosnd->lock, flags); 91 return; 92 } 93 gosnd->avail -= runtime->period_size; 94 spin_unlock_irqrestore(&gosnd->lock, flags); 95 if (gosnd->capturing) 96 snd_pcm_period_elapsed(gosnd->substream); 97 } 98 99 static int go7007_snd_hw_params(struct snd_pcm_substream *substream, 100 struct snd_pcm_hw_params *hw_params) 101 { 102 struct go7007 *go = snd_pcm_substream_chip(substream); 103 unsigned int bytes; 104 105 bytes = params_buffer_bytes(hw_params); 106 if (substream->runtime->dma_bytes > 0) 107 vfree(substream->runtime->dma_area); 108 substream->runtime->dma_bytes = 0; 109 substream->runtime->dma_area = vmalloc(bytes); 110 if (substream->runtime->dma_area == NULL) 111 return -ENOMEM; 112 substream->runtime->dma_bytes = bytes; 113 go->audio_deliver = parse_audio_stream_data; 114 return 0; 115 } 116 117 static int go7007_snd_hw_free(struct snd_pcm_substream *substream) 118 { 119 struct go7007 *go = snd_pcm_substream_chip(substream); 120 121 go->audio_deliver = NULL; 122 if (substream->runtime->dma_bytes > 0) 123 vfree(substream->runtime->dma_area); 124 substream->runtime->dma_bytes = 0; 125 return 0; 126 } 127 128 static int go7007_snd_capture_open(struct snd_pcm_substream *substream) 129 { 130 struct go7007 *go = snd_pcm_substream_chip(substream); 131 struct go7007_snd *gosnd = go->snd_context; 132 unsigned long flags; 133 int r; 134 135 spin_lock_irqsave(&gosnd->lock, flags); 136 if (gosnd->substream == NULL) { 137 gosnd->substream = substream; 138 substream->runtime->hw = go7007_snd_capture_hw; 139 r = 0; 140 } else 141 r = -EBUSY; 142 spin_unlock_irqrestore(&gosnd->lock, flags); 143 return r; 144 } 145 146 static int go7007_snd_capture_close(struct snd_pcm_substream *substream) 147 { 148 struct go7007 *go = snd_pcm_substream_chip(substream); 149 struct go7007_snd *gosnd = go->snd_context; 150 151 gosnd->substream = NULL; 152 return 0; 153 } 154 155 static int go7007_snd_pcm_prepare(struct snd_pcm_substream *substream) 156 { 157 return 0; 158 } 159 160 static int go7007_snd_pcm_trigger(struct snd_pcm_substream *substream, int cmd) 161 { 162 struct go7007 *go = snd_pcm_substream_chip(substream); 163 struct go7007_snd *gosnd = go->snd_context; 164 165 switch (cmd) { 166 case SNDRV_PCM_TRIGGER_START: 167 /* Just set a flag to indicate we should signal ALSA when 168 * sound comes in */ 169 gosnd->capturing = 1; 170 return 0; 171 case SNDRV_PCM_TRIGGER_STOP: 172 gosnd->hw_ptr = gosnd->w_idx = gosnd->avail = 0; 173 gosnd->capturing = 0; 174 return 0; 175 default: 176 return -EINVAL; 177 } 178 } 179 180 static snd_pcm_uframes_t go7007_snd_pcm_pointer(struct snd_pcm_substream *substream) 181 { 182 struct go7007 *go = snd_pcm_substream_chip(substream); 183 struct go7007_snd *gosnd = go->snd_context; 184 185 return gosnd->hw_ptr; 186 } 187 188 static struct page *go7007_snd_pcm_page(struct snd_pcm_substream *substream, 189 unsigned long offset) 190 { 191 return vmalloc_to_page(substream->runtime->dma_area + offset); 192 } 193 194 static const struct snd_pcm_ops go7007_snd_capture_ops = { 195 .open = go7007_snd_capture_open, 196 .close = go7007_snd_capture_close, 197 .ioctl = snd_pcm_lib_ioctl, 198 .hw_params = go7007_snd_hw_params, 199 .hw_free = go7007_snd_hw_free, 200 .prepare = go7007_snd_pcm_prepare, 201 .trigger = go7007_snd_pcm_trigger, 202 .pointer = go7007_snd_pcm_pointer, 203 .page = go7007_snd_pcm_page, 204 }; 205 206 static int go7007_snd_free(struct snd_device *device) 207 { 208 struct go7007 *go = device->device_data; 209 210 kfree(go->snd_context); 211 go->snd_context = NULL; 212 return 0; 213 } 214 215 static struct snd_device_ops go7007_snd_device_ops = { 216 .dev_free = go7007_snd_free, 217 }; 218 219 int go7007_snd_init(struct go7007 *go) 220 { 221 static int dev; 222 struct go7007_snd *gosnd; 223 int ret; 224 225 if (dev >= SNDRV_CARDS) 226 return -ENODEV; 227 if (!enable[dev]) { 228 dev++; 229 return -ENOENT; 230 } 231 gosnd = kmalloc(sizeof(struct go7007_snd), GFP_KERNEL); 232 if (gosnd == NULL) 233 return -ENOMEM; 234 spin_lock_init(&gosnd->lock); 235 gosnd->hw_ptr = gosnd->w_idx = gosnd->avail = 0; 236 gosnd->capturing = 0; 237 ret = snd_card_new(go->dev, index[dev], id[dev], THIS_MODULE, 0, 238 &gosnd->card); 239 if (ret < 0) { 240 kfree(gosnd); 241 return ret; 242 } 243 ret = snd_device_new(gosnd->card, SNDRV_DEV_LOWLEVEL, go, 244 &go7007_snd_device_ops); 245 if (ret < 0) { 246 kfree(gosnd); 247 return ret; 248 } 249 ret = snd_pcm_new(gosnd->card, "go7007", 0, 0, 1, &gosnd->pcm); 250 if (ret < 0) { 251 snd_card_free(gosnd->card); 252 kfree(gosnd); 253 return ret; 254 } 255 strscpy(gosnd->card->driver, "go7007", sizeof(gosnd->card->driver)); 256 strscpy(gosnd->card->shortname, go->name, sizeof(gosnd->card->shortname)); 257 strscpy(gosnd->card->longname, gosnd->card->shortname, 258 sizeof(gosnd->card->longname)); 259 260 gosnd->pcm->private_data = go; 261 snd_pcm_set_ops(gosnd->pcm, SNDRV_PCM_STREAM_CAPTURE, 262 &go7007_snd_capture_ops); 263 264 ret = snd_card_register(gosnd->card); 265 if (ret < 0) { 266 snd_card_free(gosnd->card); 267 kfree(gosnd); 268 return ret; 269 } 270 271 gosnd->substream = NULL; 272 go->snd_context = gosnd; 273 v4l2_device_get(&go->v4l2_dev); 274 ++dev; 275 276 return 0; 277 } 278 EXPORT_SYMBOL(go7007_snd_init); 279 280 int go7007_snd_remove(struct go7007 *go) 281 { 282 struct go7007_snd *gosnd = go->snd_context; 283 284 snd_card_disconnect(gosnd->card); 285 snd_card_free_when_closed(gosnd->card); 286 v4l2_device_put(&go->v4l2_dev); 287 return 0; 288 } 289 EXPORT_SYMBOL(go7007_snd_remove); 290 291 MODULE_LICENSE("GPL v2"); 292