1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3  * ff-pcm.c - a part of driver for RME Fireface series
4  *
5  * Copyright (c) 2015-2017 Takashi Sakamoto
6  */
7 
8 #include "ff.h"
9 
hw_rule_rate(struct snd_pcm_hw_params * params,struct snd_pcm_hw_rule * rule)10 static int hw_rule_rate(struct snd_pcm_hw_params *params,
11 			struct snd_pcm_hw_rule *rule)
12 {
13 	const unsigned int *pcm_channels = rule->private;
14 	struct snd_interval *r =
15 		hw_param_interval(params, SNDRV_PCM_HW_PARAM_RATE);
16 	const struct snd_interval *c =
17 		hw_param_interval_c(params, SNDRV_PCM_HW_PARAM_CHANNELS);
18 	struct snd_interval t = {
19 		.min = UINT_MAX, .max = 0, .integer = 1
20 	};
21 	unsigned int i;
22 
23 	for (i = 0; i < ARRAY_SIZE(amdtp_rate_table); i++) {
24 		enum snd_ff_stream_mode mode;
25 		int err;
26 
27 		err = snd_ff_stream_get_multiplier_mode(i, &mode);
28 		if (err < 0)
29 			continue;
30 
31 		if (!snd_interval_test(c, pcm_channels[mode]))
32 			continue;
33 
34 		t.min = min(t.min, amdtp_rate_table[i]);
35 		t.max = max(t.max, amdtp_rate_table[i]);
36 	}
37 
38 	return snd_interval_refine(r, &t);
39 }
40 
hw_rule_channels(struct snd_pcm_hw_params * params,struct snd_pcm_hw_rule * rule)41 static int hw_rule_channels(struct snd_pcm_hw_params *params,
42 			    struct snd_pcm_hw_rule *rule)
43 {
44 	const unsigned int *pcm_channels = rule->private;
45 	struct snd_interval *c =
46 		hw_param_interval(params, SNDRV_PCM_HW_PARAM_CHANNELS);
47 	const struct snd_interval *r =
48 		hw_param_interval_c(params, SNDRV_PCM_HW_PARAM_RATE);
49 	struct snd_interval t = {
50 		.min = UINT_MAX, .max = 0, .integer = 1
51 	};
52 	unsigned int i;
53 
54 	for (i = 0; i < ARRAY_SIZE(amdtp_rate_table); i++) {
55 		enum snd_ff_stream_mode mode;
56 		int err;
57 
58 		err = snd_ff_stream_get_multiplier_mode(i, &mode);
59 		if (err < 0)
60 			continue;
61 
62 		if (!snd_interval_test(r, amdtp_rate_table[i]))
63 			continue;
64 
65 		t.min = min(t.min, pcm_channels[mode]);
66 		t.max = max(t.max, pcm_channels[mode]);
67 	}
68 
69 	return snd_interval_refine(c, &t);
70 }
71 
limit_channels_and_rates(struct snd_pcm_hardware * hw,const unsigned int * pcm_channels)72 static void limit_channels_and_rates(struct snd_pcm_hardware *hw,
73 				     const unsigned int *pcm_channels)
74 {
75 	unsigned int rate, channels;
76 	int i;
77 
78 	hw->channels_min = UINT_MAX;
79 	hw->channels_max = 0;
80 	hw->rate_min = UINT_MAX;
81 	hw->rate_max = 0;
82 
83 	for (i = 0; i < ARRAY_SIZE(amdtp_rate_table); i++) {
84 		enum snd_ff_stream_mode mode;
85 		int err;
86 
87 		err = snd_ff_stream_get_multiplier_mode(i, &mode);
88 		if (err < 0)
89 			continue;
90 
91 		channels = pcm_channels[mode];
92 		if (pcm_channels[mode] == 0)
93 			continue;
94 		hw->channels_min = min(hw->channels_min, channels);
95 		hw->channels_max = max(hw->channels_max, channels);
96 
97 		rate = amdtp_rate_table[i];
98 		hw->rates |= snd_pcm_rate_to_rate_bit(rate);
99 		hw->rate_min = min(hw->rate_min, rate);
100 		hw->rate_max = max(hw->rate_max, rate);
101 	}
102 }
103 
pcm_init_hw_params(struct snd_ff * ff,struct snd_pcm_substream * substream)104 static int pcm_init_hw_params(struct snd_ff *ff,
105 			      struct snd_pcm_substream *substream)
106 {
107 	struct snd_pcm_runtime *runtime = substream->runtime;
108 	struct amdtp_stream *s;
109 	const unsigned int *pcm_channels;
110 	int err;
111 
112 	if (substream->stream == SNDRV_PCM_STREAM_CAPTURE) {
113 		runtime->hw.formats = SNDRV_PCM_FMTBIT_S32;
114 		s = &ff->tx_stream;
115 		pcm_channels = ff->spec->pcm_capture_channels;
116 	} else {
117 		runtime->hw.formats = SNDRV_PCM_FMTBIT_S32;
118 		s = &ff->rx_stream;
119 		pcm_channels = ff->spec->pcm_playback_channels;
120 	}
121 
122 	limit_channels_and_rates(&runtime->hw, pcm_channels);
123 
124 	err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_CHANNELS,
125 				  hw_rule_channels, (void *)pcm_channels,
126 				  SNDRV_PCM_HW_PARAM_RATE, -1);
127 	if (err < 0)
128 		return err;
129 
130 	err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_RATE,
131 				  hw_rule_rate, (void *)pcm_channels,
132 				  SNDRV_PCM_HW_PARAM_CHANNELS, -1);
133 	if (err < 0)
134 		return err;
135 
136 	return amdtp_ff_add_pcm_hw_constraints(s, runtime);
137 }
138 
pcm_open(struct snd_pcm_substream * substream)139 static int pcm_open(struct snd_pcm_substream *substream)
140 {
141 	struct snd_ff *ff = substream->private_data;
142 	struct amdtp_domain *d = &ff->domain;
143 	unsigned int rate;
144 	enum snd_ff_clock_src src;
145 	int i, err;
146 
147 	err = snd_ff_stream_lock_try(ff);
148 	if (err < 0)
149 		return err;
150 
151 	err = pcm_init_hw_params(ff, substream);
152 	if (err < 0)
153 		goto release_lock;
154 
155 	err = ff->spec->protocol->get_clock(ff, &rate, &src);
156 	if (err < 0)
157 		goto release_lock;
158 
159 	mutex_lock(&ff->mutex);
160 
161 	// When source of clock is not internal or any stream is reserved for
162 	// transmission of PCM frames, the available sampling rate is limited
163 	// at current one.
164 	if (src != SND_FF_CLOCK_SRC_INTERNAL) {
165 		for (i = 0; i < CIP_SFC_COUNT; ++i) {
166 			if (amdtp_rate_table[i] == rate)
167 				break;
168 		}
169 
170 		// The unit is configured at sampling frequency which packet
171 		// streaming engine can't support.
172 		if (i >= CIP_SFC_COUNT) {
173 			mutex_unlock(&ff->mutex);
174 			err = -EIO;
175 			goto release_lock;
176 		}
177 
178 		substream->runtime->hw.rate_min = rate;
179 		substream->runtime->hw.rate_max = rate;
180 	} else {
181 		if (ff->substreams_counter > 0) {
182 			unsigned int frames_per_period = d->events_per_period;
183 			unsigned int frames_per_buffer = d->events_per_buffer;
184 
185 			rate = amdtp_rate_table[ff->rx_stream.sfc];
186 			substream->runtime->hw.rate_min = rate;
187 			substream->runtime->hw.rate_max = rate;
188 
189 			err = snd_pcm_hw_constraint_minmax(substream->runtime,
190 					SNDRV_PCM_HW_PARAM_PERIOD_SIZE,
191 					frames_per_period, frames_per_period);
192 			if (err < 0) {
193 				mutex_unlock(&ff->mutex);
194 				goto release_lock;
195 			}
196 
197 			err = snd_pcm_hw_constraint_minmax(substream->runtime,
198 					SNDRV_PCM_HW_PARAM_BUFFER_SIZE,
199 					frames_per_buffer, frames_per_buffer);
200 			if (err < 0) {
201 				mutex_unlock(&ff->mutex);
202 				goto release_lock;
203 			}
204 		}
205 	}
206 
207 	mutex_unlock(&ff->mutex);
208 
209 	snd_pcm_set_sync(substream);
210 
211 	return 0;
212 
213 release_lock:
214 	snd_ff_stream_lock_release(ff);
215 	return err;
216 }
217 
pcm_close(struct snd_pcm_substream * substream)218 static int pcm_close(struct snd_pcm_substream *substream)
219 {
220 	struct snd_ff *ff = substream->private_data;
221 
222 	snd_ff_stream_lock_release(ff);
223 
224 	return 0;
225 }
226 
pcm_hw_params(struct snd_pcm_substream * substream,struct snd_pcm_hw_params * hw_params)227 static int pcm_hw_params(struct snd_pcm_substream *substream,
228 			 struct snd_pcm_hw_params *hw_params)
229 {
230 	struct snd_ff *ff = substream->private_data;
231 	int err = 0;
232 
233 	if (substream->runtime->state == SNDRV_PCM_STATE_OPEN) {
234 		unsigned int rate = params_rate(hw_params);
235 		unsigned int frames_per_period = params_period_size(hw_params);
236 		unsigned int frames_per_buffer = params_buffer_size(hw_params);
237 
238 		mutex_lock(&ff->mutex);
239 		err = snd_ff_stream_reserve_duplex(ff, rate, frames_per_period,
240 						   frames_per_buffer);
241 		if (err >= 0)
242 			++ff->substreams_counter;
243 		mutex_unlock(&ff->mutex);
244 	}
245 
246 	return err;
247 }
248 
pcm_hw_free(struct snd_pcm_substream * substream)249 static int pcm_hw_free(struct snd_pcm_substream *substream)
250 {
251 	struct snd_ff *ff = substream->private_data;
252 
253 	mutex_lock(&ff->mutex);
254 
255 	if (substream->runtime->state != SNDRV_PCM_STATE_OPEN)
256 		--ff->substreams_counter;
257 
258 	snd_ff_stream_stop_duplex(ff);
259 
260 	mutex_unlock(&ff->mutex);
261 
262 	return 0;
263 }
264 
pcm_capture_prepare(struct snd_pcm_substream * substream)265 static int pcm_capture_prepare(struct snd_pcm_substream *substream)
266 {
267 	struct snd_ff *ff = substream->private_data;
268 	struct snd_pcm_runtime *runtime = substream->runtime;
269 	int err;
270 
271 	mutex_lock(&ff->mutex);
272 
273 	err = snd_ff_stream_start_duplex(ff, runtime->rate);
274 	if (err >= 0)
275 		amdtp_stream_pcm_prepare(&ff->tx_stream);
276 
277 	mutex_unlock(&ff->mutex);
278 
279 	return err;
280 }
281 
pcm_playback_prepare(struct snd_pcm_substream * substream)282 static int pcm_playback_prepare(struct snd_pcm_substream *substream)
283 {
284 	struct snd_ff *ff = substream->private_data;
285 	struct snd_pcm_runtime *runtime = substream->runtime;
286 	int err;
287 
288 	mutex_lock(&ff->mutex);
289 
290 	err = snd_ff_stream_start_duplex(ff, runtime->rate);
291 	if (err >= 0)
292 		amdtp_stream_pcm_prepare(&ff->rx_stream);
293 
294 	mutex_unlock(&ff->mutex);
295 
296 	return err;
297 }
298 
pcm_capture_trigger(struct snd_pcm_substream * substream,int cmd)299 static int pcm_capture_trigger(struct snd_pcm_substream *substream, int cmd)
300 {
301 	struct snd_ff *ff = substream->private_data;
302 
303 	switch (cmd) {
304 	case SNDRV_PCM_TRIGGER_START:
305 		amdtp_stream_pcm_trigger(&ff->tx_stream, substream);
306 		break;
307 	case SNDRV_PCM_TRIGGER_STOP:
308 		amdtp_stream_pcm_trigger(&ff->tx_stream, NULL);
309 		break;
310 	default:
311 		return -EINVAL;
312 	}
313 
314 	return 0;
315 }
316 
pcm_playback_trigger(struct snd_pcm_substream * substream,int cmd)317 static int pcm_playback_trigger(struct snd_pcm_substream *substream, int cmd)
318 {
319 	struct snd_ff *ff = substream->private_data;
320 
321 	switch (cmd) {
322 	case SNDRV_PCM_TRIGGER_START:
323 		amdtp_stream_pcm_trigger(&ff->rx_stream, substream);
324 		break;
325 	case SNDRV_PCM_TRIGGER_STOP:
326 		amdtp_stream_pcm_trigger(&ff->rx_stream, NULL);
327 		break;
328 	default:
329 		return -EINVAL;
330 	}
331 
332 	return 0;
333 }
334 
pcm_capture_pointer(struct snd_pcm_substream * sbstrm)335 static snd_pcm_uframes_t pcm_capture_pointer(struct snd_pcm_substream *sbstrm)
336 {
337 	struct snd_ff *ff = sbstrm->private_data;
338 
339 	return amdtp_domain_stream_pcm_pointer(&ff->domain, &ff->tx_stream);
340 }
341 
pcm_playback_pointer(struct snd_pcm_substream * sbstrm)342 static snd_pcm_uframes_t pcm_playback_pointer(struct snd_pcm_substream *sbstrm)
343 {
344 	struct snd_ff *ff = sbstrm->private_data;
345 
346 	return amdtp_domain_stream_pcm_pointer(&ff->domain, &ff->rx_stream);
347 }
348 
pcm_capture_ack(struct snd_pcm_substream * substream)349 static int pcm_capture_ack(struct snd_pcm_substream *substream)
350 {
351 	struct snd_ff *ff = substream->private_data;
352 
353 	return amdtp_domain_stream_pcm_ack(&ff->domain, &ff->tx_stream);
354 }
355 
pcm_playback_ack(struct snd_pcm_substream * substream)356 static int pcm_playback_ack(struct snd_pcm_substream *substream)
357 {
358 	struct snd_ff *ff = substream->private_data;
359 
360 	return amdtp_domain_stream_pcm_ack(&ff->domain, &ff->rx_stream);
361 }
362 
snd_ff_create_pcm_devices(struct snd_ff * ff)363 int snd_ff_create_pcm_devices(struct snd_ff *ff)
364 {
365 	static const struct snd_pcm_ops pcm_capture_ops = {
366 		.open		= pcm_open,
367 		.close		= pcm_close,
368 		.hw_params	= pcm_hw_params,
369 		.hw_free	= pcm_hw_free,
370 		.prepare	= pcm_capture_prepare,
371 		.trigger	= pcm_capture_trigger,
372 		.pointer	= pcm_capture_pointer,
373 		.ack		= pcm_capture_ack,
374 	};
375 	static const struct snd_pcm_ops pcm_playback_ops = {
376 		.open		= pcm_open,
377 		.close		= pcm_close,
378 		.hw_params	= pcm_hw_params,
379 		.hw_free	= pcm_hw_free,
380 		.prepare	= pcm_playback_prepare,
381 		.trigger	= pcm_playback_trigger,
382 		.pointer	= pcm_playback_pointer,
383 		.ack		= pcm_playback_ack,
384 	};
385 	struct snd_pcm *pcm;
386 	int err;
387 
388 	err = snd_pcm_new(ff->card, ff->card->driver, 0, 1, 1, &pcm);
389 	if (err < 0)
390 		return err;
391 
392 	pcm->private_data = ff;
393 	snprintf(pcm->name, sizeof(pcm->name),
394 		 "%s PCM", ff->card->shortname);
395 	snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_PLAYBACK, &pcm_playback_ops);
396 	snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_CAPTURE, &pcm_capture_ops);
397 	snd_pcm_set_managed_buffer_all(pcm, SNDRV_DMA_TYPE_VMALLOC, NULL, 0, 0);
398 
399 	return 0;
400 }
401