1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3 * ff-stream.c - a part of driver for RME Fireface series
4 *
5 * Copyright (c) 2015-2017 Takashi Sakamoto
6 */
7
8 #include "ff.h"
9
10 #define CALLBACK_TIMEOUT_MS 200
11
snd_ff_stream_get_multiplier_mode(enum cip_sfc sfc,enum snd_ff_stream_mode * mode)12 int snd_ff_stream_get_multiplier_mode(enum cip_sfc sfc,
13 enum snd_ff_stream_mode *mode)
14 {
15 static const enum snd_ff_stream_mode modes[] = {
16 [CIP_SFC_32000] = SND_FF_STREAM_MODE_LOW,
17 [CIP_SFC_44100] = SND_FF_STREAM_MODE_LOW,
18 [CIP_SFC_48000] = SND_FF_STREAM_MODE_LOW,
19 [CIP_SFC_88200] = SND_FF_STREAM_MODE_MID,
20 [CIP_SFC_96000] = SND_FF_STREAM_MODE_MID,
21 [CIP_SFC_176400] = SND_FF_STREAM_MODE_HIGH,
22 [CIP_SFC_192000] = SND_FF_STREAM_MODE_HIGH,
23 };
24
25 if (sfc >= CIP_SFC_COUNT)
26 return -EINVAL;
27
28 *mode = modes[sfc];
29
30 return 0;
31 }
32
finish_session(struct snd_ff * ff)33 static inline void finish_session(struct snd_ff *ff)
34 {
35 ff->spec->protocol->finish_session(ff);
36 ff->spec->protocol->switch_fetching_mode(ff, false);
37 }
38
init_stream(struct snd_ff * ff,struct amdtp_stream * s)39 static int init_stream(struct snd_ff *ff, struct amdtp_stream *s)
40 {
41 struct fw_iso_resources *resources;
42 enum amdtp_stream_direction dir;
43 int err;
44
45 if (s == &ff->tx_stream) {
46 resources = &ff->tx_resources;
47 dir = AMDTP_IN_STREAM;
48 } else {
49 resources = &ff->rx_resources;
50 dir = AMDTP_OUT_STREAM;
51 }
52
53 err = fw_iso_resources_init(resources, ff->unit);
54 if (err < 0)
55 return err;
56
57 err = amdtp_ff_init(s, ff->unit, dir);
58 if (err < 0)
59 fw_iso_resources_destroy(resources);
60
61 return err;
62 }
63
destroy_stream(struct snd_ff * ff,struct amdtp_stream * s)64 static void destroy_stream(struct snd_ff *ff, struct amdtp_stream *s)
65 {
66 amdtp_stream_destroy(s);
67
68 if (s == &ff->tx_stream)
69 fw_iso_resources_destroy(&ff->tx_resources);
70 else
71 fw_iso_resources_destroy(&ff->rx_resources);
72 }
73
snd_ff_stream_init_duplex(struct snd_ff * ff)74 int snd_ff_stream_init_duplex(struct snd_ff *ff)
75 {
76 int err;
77
78 err = init_stream(ff, &ff->rx_stream);
79 if (err < 0)
80 return err;
81
82 err = init_stream(ff, &ff->tx_stream);
83 if (err < 0) {
84 destroy_stream(ff, &ff->rx_stream);
85 return err;
86 }
87
88 err = amdtp_domain_init(&ff->domain);
89 if (err < 0) {
90 destroy_stream(ff, &ff->rx_stream);
91 destroy_stream(ff, &ff->tx_stream);
92 }
93
94 return err;
95 }
96
97 /*
98 * This function should be called before starting streams or after stopping
99 * streams.
100 */
snd_ff_stream_destroy_duplex(struct snd_ff * ff)101 void snd_ff_stream_destroy_duplex(struct snd_ff *ff)
102 {
103 amdtp_domain_destroy(&ff->domain);
104
105 destroy_stream(ff, &ff->rx_stream);
106 destroy_stream(ff, &ff->tx_stream);
107 }
108
snd_ff_stream_reserve_duplex(struct snd_ff * ff,unsigned int rate,unsigned int frames_per_period,unsigned int frames_per_buffer)109 int snd_ff_stream_reserve_duplex(struct snd_ff *ff, unsigned int rate,
110 unsigned int frames_per_period,
111 unsigned int frames_per_buffer)
112 {
113 unsigned int curr_rate;
114 enum snd_ff_clock_src src;
115 int err;
116
117 err = ff->spec->protocol->get_clock(ff, &curr_rate, &src);
118 if (err < 0)
119 return err;
120
121 if (ff->substreams_counter == 0 || curr_rate != rate) {
122 enum snd_ff_stream_mode mode;
123 int i;
124
125 amdtp_domain_stop(&ff->domain);
126 finish_session(ff);
127
128 fw_iso_resources_free(&ff->tx_resources);
129 fw_iso_resources_free(&ff->rx_resources);
130
131 for (i = 0; i < CIP_SFC_COUNT; ++i) {
132 if (amdtp_rate_table[i] == rate)
133 break;
134 }
135 if (i >= CIP_SFC_COUNT)
136 return -EINVAL;
137
138 err = snd_ff_stream_get_multiplier_mode(i, &mode);
139 if (err < 0)
140 return err;
141
142 err = amdtp_ff_set_parameters(&ff->tx_stream, rate,
143 ff->spec->pcm_capture_channels[mode]);
144 if (err < 0)
145 return err;
146
147 err = amdtp_ff_set_parameters(&ff->rx_stream, rate,
148 ff->spec->pcm_playback_channels[mode]);
149 if (err < 0)
150 return err;
151
152 err = ff->spec->protocol->allocate_resources(ff, rate);
153 if (err < 0)
154 return err;
155
156 err = amdtp_domain_set_events_per_period(&ff->domain,
157 frames_per_period, frames_per_buffer);
158 if (err < 0) {
159 fw_iso_resources_free(&ff->tx_resources);
160 fw_iso_resources_free(&ff->rx_resources);
161 return err;
162 }
163 }
164
165 return 0;
166 }
167
snd_ff_stream_start_duplex(struct snd_ff * ff,unsigned int rate)168 int snd_ff_stream_start_duplex(struct snd_ff *ff, unsigned int rate)
169 {
170 int err;
171
172 if (ff->substreams_counter == 0)
173 return 0;
174
175 if (amdtp_streaming_error(&ff->tx_stream) ||
176 amdtp_streaming_error(&ff->rx_stream)) {
177 amdtp_domain_stop(&ff->domain);
178 finish_session(ff);
179 }
180
181 /*
182 * Regardless of current source of clock signal, drivers transfer some
183 * packets. Then, the device transfers packets.
184 */
185 if (!amdtp_stream_running(&ff->rx_stream)) {
186 int spd = fw_parent_device(ff->unit)->max_speed;
187
188 err = ff->spec->protocol->begin_session(ff, rate);
189 if (err < 0)
190 goto error;
191
192 err = amdtp_domain_add_stream(&ff->domain, &ff->rx_stream,
193 ff->rx_resources.channel, spd);
194 if (err < 0)
195 goto error;
196
197 err = amdtp_domain_add_stream(&ff->domain, &ff->tx_stream,
198 ff->tx_resources.channel, spd);
199 if (err < 0)
200 goto error;
201
202 err = amdtp_domain_start(&ff->domain, 0);
203 if (err < 0)
204 goto error;
205
206 if (!amdtp_stream_wait_callback(&ff->rx_stream,
207 CALLBACK_TIMEOUT_MS) ||
208 !amdtp_stream_wait_callback(&ff->tx_stream,
209 CALLBACK_TIMEOUT_MS)) {
210 err = -ETIMEDOUT;
211 goto error;
212 }
213
214 err = ff->spec->protocol->switch_fetching_mode(ff, true);
215 if (err < 0)
216 goto error;
217 }
218
219 return 0;
220 error:
221 amdtp_domain_stop(&ff->domain);
222 finish_session(ff);
223
224 return err;
225 }
226
snd_ff_stream_stop_duplex(struct snd_ff * ff)227 void snd_ff_stream_stop_duplex(struct snd_ff *ff)
228 {
229 if (ff->substreams_counter == 0) {
230 amdtp_domain_stop(&ff->domain);
231 finish_session(ff);
232
233 fw_iso_resources_free(&ff->tx_resources);
234 fw_iso_resources_free(&ff->rx_resources);
235 }
236 }
237
snd_ff_stream_update_duplex(struct snd_ff * ff)238 void snd_ff_stream_update_duplex(struct snd_ff *ff)
239 {
240 amdtp_domain_stop(&ff->domain);
241
242 // The device discontinue to transfer packets.
243 amdtp_stream_pcm_abort(&ff->tx_stream);
244 amdtp_stream_pcm_abort(&ff->rx_stream);
245 }
246
snd_ff_stream_lock_changed(struct snd_ff * ff)247 void snd_ff_stream_lock_changed(struct snd_ff *ff)
248 {
249 ff->dev_lock_changed = true;
250 wake_up(&ff->hwdep_wait);
251 }
252
snd_ff_stream_lock_try(struct snd_ff * ff)253 int snd_ff_stream_lock_try(struct snd_ff *ff)
254 {
255 int err;
256
257 spin_lock_irq(&ff->lock);
258
259 /* user land lock this */
260 if (ff->dev_lock_count < 0) {
261 err = -EBUSY;
262 goto end;
263 }
264
265 /* this is the first time */
266 if (ff->dev_lock_count++ == 0)
267 snd_ff_stream_lock_changed(ff);
268 err = 0;
269 end:
270 spin_unlock_irq(&ff->lock);
271 return err;
272 }
273
snd_ff_stream_lock_release(struct snd_ff * ff)274 void snd_ff_stream_lock_release(struct snd_ff *ff)
275 {
276 spin_lock_irq(&ff->lock);
277
278 if (WARN_ON(ff->dev_lock_count <= 0))
279 goto end;
280 if (--ff->dev_lock_count == 0)
281 snd_ff_stream_lock_changed(ff);
282 end:
283 spin_unlock_irq(&ff->lock);
284 }
285