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1// SPDX-License-Identifier: GPL-2.0-only2/*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/time.h>13#include <linux/mm.h>14#include <linux/i2c.h>15#include <linux/mutex.h>16#include <linux/uaccess.h>17#include <linux/slab.h>18#include <sound/core.h>19#include <sound/pcm.h>20#include <sound/initval.h>21 22#include "go7007-priv.h"23 24static int index[SNDRV_CARDS] = SNDRV_DEFAULT_IDX;25static char *id[SNDRV_CARDS] = SNDRV_DEFAULT_STR;26static bool enable[SNDRV_CARDS] = SNDRV_DEFAULT_ENABLE_PNP;27 28module_param_array(index, int, NULL, 0444);29module_param_array(id, charp, NULL, 0444);30module_param_array(enable, bool, NULL, 0444);31MODULE_PARM_DESC(index, "Index value for the go7007 audio driver");32MODULE_PARM_DESC(id, "ID string for the go7007 audio driver");33MODULE_PARM_DESC(enable, "Enable for the go7007 audio driver");34 35struct go7007_snd {36 struct snd_card *card;37 struct snd_pcm *pcm;38 struct snd_pcm_substream *substream;39 spinlock_t lock;40 int w_idx;41 int hw_ptr;42 int avail;43 int capturing;44};45 46static const struct snd_pcm_hardware go7007_snd_capture_hw = {47 .info = (SNDRV_PCM_INFO_MMAP |48 SNDRV_PCM_INFO_INTERLEAVED |49 SNDRV_PCM_INFO_BLOCK_TRANSFER |50 SNDRV_PCM_INFO_MMAP_VALID),51 .formats = SNDRV_PCM_FMTBIT_S16_LE,52 .rates = SNDRV_PCM_RATE_48000,53 .rate_min = 48000,54 .rate_max = 48000,55 .channels_min = 2,56 .channels_max = 2,57 .buffer_bytes_max = (128*1024),58 .period_bytes_min = 4096,59 .period_bytes_max = (128*1024),60 .periods_min = 1,61 .periods_max = 32,62};63 64static void parse_audio_stream_data(struct go7007 *go, u8 *buf, int length)65{66 struct go7007_snd *gosnd = go->snd_context;67 struct snd_pcm_runtime *runtime = gosnd->substream->runtime;68 int frames = bytes_to_frames(runtime, length);69 unsigned long flags;70 71 spin_lock_irqsave(&gosnd->lock, flags);72 gosnd->hw_ptr += frames;73 if (gosnd->hw_ptr >= runtime->buffer_size)74 gosnd->hw_ptr -= runtime->buffer_size;75 gosnd->avail += frames;76 spin_unlock_irqrestore(&gosnd->lock, flags);77 if (gosnd->w_idx + length > runtime->dma_bytes) {78 int cpy = runtime->dma_bytes - gosnd->w_idx;79 80 memcpy(runtime->dma_area + gosnd->w_idx, buf, cpy);81 length -= cpy;82 buf += cpy;83 gosnd->w_idx = 0;84 }85 memcpy(runtime->dma_area + gosnd->w_idx, buf, length);86 gosnd->w_idx += length;87 spin_lock_irqsave(&gosnd->lock, flags);88 if (gosnd->avail < runtime->period_size) {89 spin_unlock_irqrestore(&gosnd->lock, flags);90 return;91 }92 gosnd->avail -= runtime->period_size;93 spin_unlock_irqrestore(&gosnd->lock, flags);94 if (gosnd->capturing)95 snd_pcm_period_elapsed(gosnd->substream);96}97 98static int go7007_snd_hw_params(struct snd_pcm_substream *substream,99 struct snd_pcm_hw_params *hw_params)100{101 struct go7007 *go = snd_pcm_substream_chip(substream);102 103 go->audio_deliver = parse_audio_stream_data;104 return 0;105}106 107static int go7007_snd_hw_free(struct snd_pcm_substream *substream)108{109 struct go7007 *go = snd_pcm_substream_chip(substream);110 111 go->audio_deliver = NULL;112 return 0;113}114 115static int go7007_snd_capture_open(struct snd_pcm_substream *substream)116{117 struct go7007 *go = snd_pcm_substream_chip(substream);118 struct go7007_snd *gosnd = go->snd_context;119 unsigned long flags;120 int r;121 122 spin_lock_irqsave(&gosnd->lock, flags);123 if (gosnd->substream == NULL) {124 gosnd->substream = substream;125 substream->runtime->hw = go7007_snd_capture_hw;126 r = 0;127 } else128 r = -EBUSY;129 spin_unlock_irqrestore(&gosnd->lock, flags);130 return r;131}132 133static int go7007_snd_capture_close(struct snd_pcm_substream *substream)134{135 struct go7007 *go = snd_pcm_substream_chip(substream);136 struct go7007_snd *gosnd = go->snd_context;137 138 gosnd->substream = NULL;139 return 0;140}141 142static int go7007_snd_pcm_prepare(struct snd_pcm_substream *substream)143{144 return 0;145}146 147static int go7007_snd_pcm_trigger(struct snd_pcm_substream *substream, int cmd)148{149 struct go7007 *go = snd_pcm_substream_chip(substream);150 struct go7007_snd *gosnd = go->snd_context;151 152 switch (cmd) {153 case SNDRV_PCM_TRIGGER_START:154 /* Just set a flag to indicate we should signal ALSA when155 * sound comes in */156 gosnd->capturing = 1;157 return 0;158 case SNDRV_PCM_TRIGGER_STOP:159 gosnd->hw_ptr = gosnd->w_idx = gosnd->avail = 0;160 gosnd->capturing = 0;161 return 0;162 default:163 return -EINVAL;164 }165}166 167static snd_pcm_uframes_t go7007_snd_pcm_pointer(struct snd_pcm_substream *substream)168{169 struct go7007 *go = snd_pcm_substream_chip(substream);170 struct go7007_snd *gosnd = go->snd_context;171 172 return gosnd->hw_ptr;173}174 175static const struct snd_pcm_ops go7007_snd_capture_ops = {176 .open = go7007_snd_capture_open,177 .close = go7007_snd_capture_close,178 .hw_params = go7007_snd_hw_params,179 .hw_free = go7007_snd_hw_free,180 .prepare = go7007_snd_pcm_prepare,181 .trigger = go7007_snd_pcm_trigger,182 .pointer = go7007_snd_pcm_pointer,183};184 185static int go7007_snd_free(struct snd_device *device)186{187 struct go7007 *go = device->device_data;188 189 kfree(go->snd_context);190 go->snd_context = NULL;191 return 0;192}193 194static const struct snd_device_ops go7007_snd_device_ops = {195 .dev_free = go7007_snd_free,196};197 198int go7007_snd_init(struct go7007 *go)199{200 static int dev;201 struct go7007_snd *gosnd;202 int ret;203 204 if (dev >= SNDRV_CARDS)205 return -ENODEV;206 if (!enable[dev]) {207 dev++;208 return -ENOENT;209 }210 gosnd = kmalloc(sizeof(struct go7007_snd), GFP_KERNEL);211 if (gosnd == NULL)212 return -ENOMEM;213 spin_lock_init(&gosnd->lock);214 gosnd->hw_ptr = gosnd->w_idx = gosnd->avail = 0;215 gosnd->capturing = 0;216 ret = snd_card_new(go->dev, index[dev], id[dev], THIS_MODULE, 0,217 &gosnd->card);218 if (ret < 0)219 goto free_snd;220 221 ret = snd_device_new(gosnd->card, SNDRV_DEV_LOWLEVEL, go,222 &go7007_snd_device_ops);223 if (ret < 0)224 goto free_card;225 226 ret = snd_pcm_new(gosnd->card, "go7007", 0, 0, 1, &gosnd->pcm);227 if (ret < 0)228 goto free_card;229 230 strscpy(gosnd->card->driver, "go7007", sizeof(gosnd->card->driver));231 strscpy(gosnd->card->shortname, go->name, sizeof(gosnd->card->shortname));232 strscpy(gosnd->card->longname, gosnd->card->shortname,233 sizeof(gosnd->card->longname));234 235 gosnd->pcm->private_data = go;236 snd_pcm_set_ops(gosnd->pcm, SNDRV_PCM_STREAM_CAPTURE,237 &go7007_snd_capture_ops);238 snd_pcm_set_managed_buffer_all(gosnd->pcm, SNDRV_DMA_TYPE_VMALLOC,239 NULL, 0, 0);240 241 ret = snd_card_register(gosnd->card);242 if (ret < 0)243 goto free_card;244 245 gosnd->substream = NULL;246 go->snd_context = gosnd;247 v4l2_device_get(&go->v4l2_dev);248 ++dev;249 250 return 0;251 252free_card:253 snd_card_free(gosnd->card);254free_snd:255 kfree(gosnd);256 return ret;257}258EXPORT_SYMBOL(go7007_snd_init);259 260int go7007_snd_remove(struct go7007 *go)261{262 struct go7007_snd *gosnd = go->snd_context;263 264 snd_card_disconnect(gosnd->card);265 snd_card_free_when_closed(gosnd->card);266 v4l2_device_put(&go->v4l2_dev);267 return 0;268}269EXPORT_SYMBOL(go7007_snd_remove);270 271MODULE_LICENSE("GPL v2");272