1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3  * tascam-pcm.c - a part of driver for TASCAM FireWire series
4  *
5  * Copyright (c) 2015 Takashi Sakamoto
6  */
7 
8 #include "tascam.h"
9 
10 static int pcm_init_hw_params(struct snd_tscm *tscm,
11 			      struct snd_pcm_substream *substream)
12 {
13 	struct snd_pcm_runtime *runtime = substream->runtime;
14 	struct snd_pcm_hardware *hw = &runtime->hw;
15 	struct amdtp_stream *stream;
16 	unsigned int pcm_channels;
17 
18 	if (substream->stream == SNDRV_PCM_STREAM_CAPTURE) {
19 		runtime->hw.formats = SNDRV_PCM_FMTBIT_S32;
20 		stream = &tscm->tx_stream;
21 		pcm_channels = tscm->spec->pcm_capture_analog_channels;
22 	} else {
23 		runtime->hw.formats = SNDRV_PCM_FMTBIT_S32;
24 		stream = &tscm->rx_stream;
25 		pcm_channels = tscm->spec->pcm_playback_analog_channels;
26 	}
27 
28 	if (tscm->spec->has_adat)
29 		pcm_channels += 8;
30 	if (tscm->spec->has_spdif)
31 		pcm_channels += 2;
32 	runtime->hw.channels_min = runtime->hw.channels_max = pcm_channels;
33 
34 	hw->rates = SNDRV_PCM_RATE_44100 |
35 		    SNDRV_PCM_RATE_48000 |
36 		    SNDRV_PCM_RATE_88200 |
37 		    SNDRV_PCM_RATE_96000;
38 	snd_pcm_limit_hw_rates(runtime);
39 
40 	return amdtp_tscm_add_pcm_hw_constraints(stream, runtime);
41 }
42 
43 static int pcm_open(struct snd_pcm_substream *substream)
44 {
45 	struct snd_tscm *tscm = substream->private_data;
46 	struct amdtp_domain *d = &tscm->domain;
47 	enum snd_tscm_clock clock;
48 	int err;
49 
50 	err = snd_tscm_stream_lock_try(tscm);
51 	if (err < 0)
52 		return err;
53 
54 	err = pcm_init_hw_params(tscm, substream);
55 	if (err < 0)
56 		goto err_locked;
57 
58 	err = snd_tscm_stream_get_clock(tscm, &clock);
59 	if (err < 0)
60 		goto err_locked;
61 
62 	mutex_lock(&tscm->mutex);
63 
64 	// When source of clock is not internal or any stream is reserved for
65 	// transmission of PCM frames, the available sampling rate is limited
66 	// at current one.
67 	if (clock != SND_TSCM_CLOCK_INTERNAL || tscm->substreams_counter > 0) {
68 		unsigned int frames_per_period = d->events_per_period;
69 		unsigned int frames_per_buffer = d->events_per_buffer;
70 		unsigned int rate;
71 
72 		err = snd_tscm_stream_get_rate(tscm, &rate);
73 		if (err < 0) {
74 			mutex_unlock(&tscm->mutex);
75 			goto err_locked;
76 		}
77 		substream->runtime->hw.rate_min = rate;
78 		substream->runtime->hw.rate_max = rate;
79 
80 		err = snd_pcm_hw_constraint_minmax(substream->runtime,
81 					SNDRV_PCM_HW_PARAM_PERIOD_SIZE,
82 					frames_per_period, frames_per_period);
83 		if (err < 0) {
84 			mutex_unlock(&tscm->mutex);
85 			goto err_locked;
86 		}
87 
88 		err = snd_pcm_hw_constraint_minmax(substream->runtime,
89 					SNDRV_PCM_HW_PARAM_BUFFER_SIZE,
90 					frames_per_buffer, frames_per_buffer);
91 		if (err < 0) {
92 			mutex_unlock(&tscm->mutex);
93 			goto err_locked;
94 		}
95 	}
96 
97 	mutex_unlock(&tscm->mutex);
98 
99 	snd_pcm_set_sync(substream);
100 
101 	return 0;
102 err_locked:
103 	snd_tscm_stream_lock_release(tscm);
104 	return err;
105 }
106 
107 static int pcm_close(struct snd_pcm_substream *substream)
108 {
109 	struct snd_tscm *tscm = substream->private_data;
110 
111 	snd_tscm_stream_lock_release(tscm);
112 
113 	return 0;
114 }
115 
116 static int pcm_hw_params(struct snd_pcm_substream *substream,
117 			 struct snd_pcm_hw_params *hw_params)
118 {
119 	struct snd_tscm *tscm = substream->private_data;
120 	int err = 0;
121 
122 	if (substream->runtime->state == SNDRV_PCM_STATE_OPEN) {
123 		unsigned int rate = params_rate(hw_params);
124 		unsigned int frames_per_period = params_period_size(hw_params);
125 		unsigned int frames_per_buffer = params_buffer_size(hw_params);
126 
127 		mutex_lock(&tscm->mutex);
128 		err = snd_tscm_stream_reserve_duplex(tscm, rate,
129 					frames_per_period, frames_per_buffer);
130 		if (err >= 0)
131 			++tscm->substreams_counter;
132 		mutex_unlock(&tscm->mutex);
133 	}
134 
135 	return err;
136 }
137 
138 static int pcm_hw_free(struct snd_pcm_substream *substream)
139 {
140 	struct snd_tscm *tscm = substream->private_data;
141 
142 	mutex_lock(&tscm->mutex);
143 
144 	if (substream->runtime->state != SNDRV_PCM_STATE_OPEN)
145 		--tscm->substreams_counter;
146 
147 	snd_tscm_stream_stop_duplex(tscm);
148 
149 	mutex_unlock(&tscm->mutex);
150 
151 	return 0;
152 }
153 
154 static int pcm_capture_prepare(struct snd_pcm_substream *substream)
155 {
156 	struct snd_tscm *tscm = substream->private_data;
157 	struct snd_pcm_runtime *runtime = substream->runtime;
158 	int err;
159 
160 	mutex_lock(&tscm->mutex);
161 
162 	err = snd_tscm_stream_start_duplex(tscm, runtime->rate);
163 	if (err >= 0)
164 		amdtp_stream_pcm_prepare(&tscm->tx_stream);
165 
166 	mutex_unlock(&tscm->mutex);
167 
168 	return err;
169 }
170 
171 static int pcm_playback_prepare(struct snd_pcm_substream *substream)
172 {
173 	struct snd_tscm *tscm = substream->private_data;
174 	struct snd_pcm_runtime *runtime = substream->runtime;
175 	int err;
176 
177 	mutex_lock(&tscm->mutex);
178 
179 	err = snd_tscm_stream_start_duplex(tscm, runtime->rate);
180 	if (err >= 0)
181 		amdtp_stream_pcm_prepare(&tscm->rx_stream);
182 
183 	mutex_unlock(&tscm->mutex);
184 
185 	return err;
186 }
187 
188 static int pcm_capture_trigger(struct snd_pcm_substream *substream, int cmd)
189 {
190 	struct snd_tscm *tscm = substream->private_data;
191 
192 	switch (cmd) {
193 	case SNDRV_PCM_TRIGGER_START:
194 		amdtp_stream_pcm_trigger(&tscm->tx_stream, substream);
195 		break;
196 	case SNDRV_PCM_TRIGGER_STOP:
197 		amdtp_stream_pcm_trigger(&tscm->tx_stream, NULL);
198 		break;
199 	default:
200 		return -EINVAL;
201 	}
202 
203 	return 0;
204 }
205 
206 static int pcm_playback_trigger(struct snd_pcm_substream *substream, int cmd)
207 {
208 	struct snd_tscm *tscm = substream->private_data;
209 
210 	switch (cmd) {
211 	case SNDRV_PCM_TRIGGER_START:
212 		amdtp_stream_pcm_trigger(&tscm->rx_stream, substream);
213 		break;
214 	case SNDRV_PCM_TRIGGER_STOP:
215 		amdtp_stream_pcm_trigger(&tscm->rx_stream, NULL);
216 		break;
217 	default:
218 		return -EINVAL;
219 	}
220 
221 	return 0;
222 }
223 
224 static snd_pcm_uframes_t pcm_capture_pointer(struct snd_pcm_substream *sbstrm)
225 {
226 	struct snd_tscm *tscm = sbstrm->private_data;
227 
228 	return amdtp_domain_stream_pcm_pointer(&tscm->domain, &tscm->tx_stream);
229 }
230 
231 static snd_pcm_uframes_t pcm_playback_pointer(struct snd_pcm_substream *sbstrm)
232 {
233 	struct snd_tscm *tscm = sbstrm->private_data;
234 
235 	return amdtp_domain_stream_pcm_pointer(&tscm->domain, &tscm->rx_stream);
236 }
237 
238 static int pcm_capture_ack(struct snd_pcm_substream *substream)
239 {
240 	struct snd_tscm *tscm = substream->private_data;
241 
242 	return amdtp_domain_stream_pcm_ack(&tscm->domain, &tscm->tx_stream);
243 }
244 
245 static int pcm_playback_ack(struct snd_pcm_substream *substream)
246 {
247 	struct snd_tscm *tscm = substream->private_data;
248 
249 	return amdtp_domain_stream_pcm_ack(&tscm->domain, &tscm->rx_stream);
250 }
251 
252 int snd_tscm_create_pcm_devices(struct snd_tscm *tscm)
253 {
254 	static const struct snd_pcm_ops capture_ops = {
255 		.open		= pcm_open,
256 		.close		= pcm_close,
257 		.hw_params	= pcm_hw_params,
258 		.hw_free	= pcm_hw_free,
259 		.prepare	= pcm_capture_prepare,
260 		.trigger	= pcm_capture_trigger,
261 		.pointer	= pcm_capture_pointer,
262 		.ack		= pcm_capture_ack,
263 	};
264 	static const struct snd_pcm_ops playback_ops = {
265 		.open		= pcm_open,
266 		.close		= pcm_close,
267 		.hw_params	= pcm_hw_params,
268 		.hw_free	= pcm_hw_free,
269 		.prepare	= pcm_playback_prepare,
270 		.trigger	= pcm_playback_trigger,
271 		.pointer	= pcm_playback_pointer,
272 		.ack		= pcm_playback_ack,
273 	};
274 	struct snd_pcm *pcm;
275 	int err;
276 
277 	err = snd_pcm_new(tscm->card, tscm->card->driver, 0, 1, 1, &pcm);
278 	if (err < 0)
279 		return err;
280 
281 	pcm->private_data = tscm;
282 	snprintf(pcm->name, sizeof(pcm->name),
283 		 "%s PCM", tscm->card->shortname);
284 	snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_PLAYBACK, &playback_ops);
285 	snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_CAPTURE, &capture_ops);
286 	snd_pcm_set_managed_buffer_all(pcm, SNDRV_DMA_TYPE_VMALLOC, NULL, 0, 0);
287 
288 	return 0;
289 }
290