2 * dice_pcm.c - a part of driver for DICE based devices
4 * Copyright (c) Clemens Ladisch <clemens@ladisch.de>
5 * Copyright (c) 2014 Takashi Sakamoto <o-takashi@sakamocchi.jp>
7 * Licensed under the terms of the GNU General Public License, version 2.
12 static int limit_channels_and_rates(struct snd_dice *dice,
13 struct snd_pcm_runtime *runtime,
14 enum amdtp_stream_direction dir,
15 unsigned int index, unsigned int size)
17 struct snd_pcm_hardware *hw = &runtime->hw;
18 struct amdtp_stream *stream;
24 * Retrieve current Multi Bit Linear Audio data channel and limit to
27 if (dir == AMDTP_IN_STREAM) {
28 stream = &dice->tx_stream[index];
29 err = snd_dice_transaction_read_tx(dice,
30 size * index + TX_NUMBER_AUDIO,
33 stream = &dice->rx_stream[index];
34 err = snd_dice_transaction_read_rx(dice,
35 size * index + RX_NUMBER_AUDIO,
41 hw->channels_min = hw->channels_max = be32_to_cpu(reg);
43 /* Retrieve current sampling transfer frequency and limit to it. */
44 err = snd_dice_transaction_get_rate(dice, &rate);
48 hw->rates = snd_pcm_rate_to_rate_bit(rate);
49 snd_pcm_limit_hw_rates(runtime);
54 static int init_hw_info(struct snd_dice *dice,
55 struct snd_pcm_substream *substream)
57 struct snd_pcm_runtime *runtime = substream->runtime;
58 struct snd_pcm_hardware *hw = &runtime->hw;
59 enum amdtp_stream_direction dir;
60 struct amdtp_stream *stream;
62 unsigned int count, size;
65 if (substream->stream == SNDRV_PCM_STREAM_CAPTURE) {
66 hw->formats = AM824_IN_PCM_FORMAT_BITS;
67 dir = AMDTP_IN_STREAM;
68 stream = &dice->tx_stream[substream->pcm->device];
69 err = snd_dice_transaction_read_tx(dice, TX_NUMBER, reg,
72 hw->formats = AM824_OUT_PCM_FORMAT_BITS;
73 dir = AMDTP_OUT_STREAM;
74 stream = &dice->rx_stream[substream->pcm->device];
75 err = snd_dice_transaction_read_rx(dice, RX_NUMBER, reg,
82 count = min_t(unsigned int, be32_to_cpu(reg[0]), MAX_STREAMS);
83 if (substream->pcm->device >= count)
86 size = be32_to_cpu(reg[1]) * 4;
87 err = limit_channels_and_rates(dice, substream->runtime, dir,
88 substream->pcm->device, size);
92 return amdtp_am824_add_pcm_hw_constraints(stream, runtime);
95 static int pcm_open(struct snd_pcm_substream *substream)
97 struct snd_dice *dice = substream->private_data;
100 err = snd_dice_stream_lock_try(dice);
104 err = init_hw_info(dice, substream);
108 snd_pcm_set_sync(substream);
112 snd_dice_stream_lock_release(dice);
116 static int pcm_close(struct snd_pcm_substream *substream)
118 struct snd_dice *dice = substream->private_data;
120 snd_dice_stream_lock_release(dice);
125 static int capture_hw_params(struct snd_pcm_substream *substream,
126 struct snd_pcm_hw_params *hw_params)
128 struct snd_dice *dice = substream->private_data;
131 err = snd_pcm_lib_alloc_vmalloc_buffer(substream,
132 params_buffer_bytes(hw_params));
136 if (substream->runtime->status->state == SNDRV_PCM_STATE_OPEN) {
137 mutex_lock(&dice->mutex);
138 dice->substreams_counter++;
139 mutex_unlock(&dice->mutex);
144 static int playback_hw_params(struct snd_pcm_substream *substream,
145 struct snd_pcm_hw_params *hw_params)
147 struct snd_dice *dice = substream->private_data;
150 err = snd_pcm_lib_alloc_vmalloc_buffer(substream,
151 params_buffer_bytes(hw_params));
155 if (substream->runtime->status->state == SNDRV_PCM_STATE_OPEN) {
156 mutex_lock(&dice->mutex);
157 dice->substreams_counter++;
158 mutex_unlock(&dice->mutex);
164 static int capture_hw_free(struct snd_pcm_substream *substream)
166 struct snd_dice *dice = substream->private_data;
168 mutex_lock(&dice->mutex);
170 if (substream->runtime->status->state != SNDRV_PCM_STATE_OPEN)
171 dice->substreams_counter--;
173 snd_dice_stream_stop_duplex(dice);
175 mutex_unlock(&dice->mutex);
177 return snd_pcm_lib_free_vmalloc_buffer(substream);
180 static int playback_hw_free(struct snd_pcm_substream *substream)
182 struct snd_dice *dice = substream->private_data;
184 mutex_lock(&dice->mutex);
186 if (substream->runtime->status->state != SNDRV_PCM_STATE_OPEN)
187 dice->substreams_counter--;
189 snd_dice_stream_stop_duplex(dice);
191 mutex_unlock(&dice->mutex);
193 return snd_pcm_lib_free_vmalloc_buffer(substream);
196 static int capture_prepare(struct snd_pcm_substream *substream)
198 struct snd_dice *dice = substream->private_data;
199 struct amdtp_stream *stream = &dice->tx_stream[substream->pcm->device];
202 mutex_lock(&dice->mutex);
203 err = snd_dice_stream_start_duplex(dice, substream->runtime->rate);
204 mutex_unlock(&dice->mutex);
206 amdtp_stream_pcm_prepare(stream);
210 static int playback_prepare(struct snd_pcm_substream *substream)
212 struct snd_dice *dice = substream->private_data;
213 struct amdtp_stream *stream = &dice->rx_stream[substream->pcm->device];
216 mutex_lock(&dice->mutex);
217 err = snd_dice_stream_start_duplex(dice, substream->runtime->rate);
218 mutex_unlock(&dice->mutex);
220 amdtp_stream_pcm_prepare(stream);
225 static int capture_trigger(struct snd_pcm_substream *substream, int cmd)
227 struct snd_dice *dice = substream->private_data;
228 struct amdtp_stream *stream = &dice->tx_stream[substream->pcm->device];
231 case SNDRV_PCM_TRIGGER_START:
232 amdtp_stream_pcm_trigger(stream, substream);
234 case SNDRV_PCM_TRIGGER_STOP:
235 amdtp_stream_pcm_trigger(stream, NULL);
243 static int playback_trigger(struct snd_pcm_substream *substream, int cmd)
245 struct snd_dice *dice = substream->private_data;
246 struct amdtp_stream *stream = &dice->rx_stream[substream->pcm->device];
249 case SNDRV_PCM_TRIGGER_START:
250 amdtp_stream_pcm_trigger(stream, substream);
252 case SNDRV_PCM_TRIGGER_STOP:
253 amdtp_stream_pcm_trigger(stream, NULL);
262 static snd_pcm_uframes_t capture_pointer(struct snd_pcm_substream *substream)
264 struct snd_dice *dice = substream->private_data;
265 struct amdtp_stream *stream = &dice->tx_stream[substream->pcm->device];
267 return amdtp_stream_pcm_pointer(stream);
269 static snd_pcm_uframes_t playback_pointer(struct snd_pcm_substream *substream)
271 struct snd_dice *dice = substream->private_data;
272 struct amdtp_stream *stream = &dice->rx_stream[substream->pcm->device];
274 return amdtp_stream_pcm_pointer(stream);
277 static int capture_ack(struct snd_pcm_substream *substream)
279 struct snd_dice *dice = substream->private_data;
280 struct amdtp_stream *stream = &dice->tx_stream[substream->pcm->device];
282 return amdtp_stream_pcm_ack(stream);
285 static int playback_ack(struct snd_pcm_substream *substream)
287 struct snd_dice *dice = substream->private_data;
288 struct amdtp_stream *stream = &dice->rx_stream[substream->pcm->device];
290 return amdtp_stream_pcm_ack(stream);
293 int snd_dice_create_pcm(struct snd_dice *dice)
295 static const struct snd_pcm_ops capture_ops = {
298 .ioctl = snd_pcm_lib_ioctl,
299 .hw_params = capture_hw_params,
300 .hw_free = capture_hw_free,
301 .prepare = capture_prepare,
302 .trigger = capture_trigger,
303 .pointer = capture_pointer,
305 .page = snd_pcm_lib_get_vmalloc_page,
306 .mmap = snd_pcm_lib_mmap_vmalloc,
308 static const struct snd_pcm_ops playback_ops = {
311 .ioctl = snd_pcm_lib_ioctl,
312 .hw_params = playback_hw_params,
313 .hw_free = playback_hw_free,
314 .prepare = playback_prepare,
315 .trigger = playback_trigger,
316 .pointer = playback_pointer,
318 .page = snd_pcm_lib_get_vmalloc_page,
319 .mmap = snd_pcm_lib_mmap_vmalloc,
323 unsigned int i, max_capture, max_playback, capture, playback;
326 /* Check whether PCM substreams are required. */
327 if (dice->force_two_pcms) {
328 max_capture = max_playback = 2;
330 max_capture = max_playback = 0;
331 err = snd_dice_transaction_read_tx(dice, TX_NUMBER, ®,
335 max_capture = min_t(unsigned int, be32_to_cpu(reg), MAX_STREAMS);
337 err = snd_dice_transaction_read_rx(dice, RX_NUMBER, ®,
341 max_playback = min_t(unsigned int, be32_to_cpu(reg), MAX_STREAMS);
344 for (i = 0; i < MAX_STREAMS; i++) {
345 capture = playback = 0;
348 if (i < max_playback)
350 if (capture == 0 && playback == 0)
353 err = snd_pcm_new(dice->card, "DICE", i, playback, capture,
357 pcm->private_data = dice;
358 strcpy(pcm->name, dice->card->shortname);
361 snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_CAPTURE,
365 snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_PLAYBACK,