1 // SPDX-License-Identifier: GPL-2.0-only
3 * ff-stream.c - a part of driver for RME Fireface series
5 * Copyright (c) 2015-2017 Takashi Sakamoto
10 #define CALLBACK_TIMEOUT_MS 200
12 int snd_ff_stream_get_multiplier_mode(enum cip_sfc sfc,
13 enum snd_ff_stream_mode *mode)
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,
25 if (sfc >= CIP_SFC_COUNT)
33 static inline void finish_session(struct snd_ff *ff)
35 amdtp_stream_stop(&ff->tx_stream);
36 amdtp_stream_stop(&ff->rx_stream);
38 ff->spec->protocol->finish_session(ff);
39 ff->spec->protocol->switch_fetching_mode(ff, false);
42 static int init_stream(struct snd_ff *ff, enum amdtp_stream_direction dir)
45 struct fw_iso_resources *resources;
46 struct amdtp_stream *stream;
48 if (dir == AMDTP_IN_STREAM) {
49 resources = &ff->tx_resources;
50 stream = &ff->tx_stream;
52 resources = &ff->rx_resources;
53 stream = &ff->rx_stream;
56 err = fw_iso_resources_init(resources, ff->unit);
60 err = amdtp_ff_init(stream, ff->unit, dir);
62 fw_iso_resources_destroy(resources);
67 static void destroy_stream(struct snd_ff *ff, enum amdtp_stream_direction dir)
69 if (dir == AMDTP_IN_STREAM) {
70 amdtp_stream_destroy(&ff->tx_stream);
71 fw_iso_resources_destroy(&ff->tx_resources);
73 amdtp_stream_destroy(&ff->rx_stream);
74 fw_iso_resources_destroy(&ff->rx_resources);
78 int snd_ff_stream_init_duplex(struct snd_ff *ff)
82 err = init_stream(ff, AMDTP_OUT_STREAM);
86 err = init_stream(ff, AMDTP_IN_STREAM);
88 destroy_stream(ff, AMDTP_OUT_STREAM);
94 * This function should be called before starting streams or after stopping
97 void snd_ff_stream_destroy_duplex(struct snd_ff *ff)
99 destroy_stream(ff, AMDTP_IN_STREAM);
100 destroy_stream(ff, AMDTP_OUT_STREAM);
103 int snd_ff_stream_reserve_duplex(struct snd_ff *ff, unsigned int rate)
105 unsigned int curr_rate;
106 enum snd_ff_clock_src src;
109 err = ff->spec->protocol->get_clock(ff, &curr_rate, &src);
113 if (ff->substreams_counter == 0 || curr_rate != rate) {
114 enum snd_ff_stream_mode mode;
119 fw_iso_resources_free(&ff->tx_resources);
120 fw_iso_resources_free(&ff->rx_resources);
122 for (i = 0; i < CIP_SFC_COUNT; ++i) {
123 if (amdtp_rate_table[i] == rate)
126 if (i >= CIP_SFC_COUNT)
129 err = snd_ff_stream_get_multiplier_mode(i, &mode);
133 err = amdtp_ff_set_parameters(&ff->tx_stream, rate,
134 ff->spec->pcm_capture_channels[mode]);
138 err = amdtp_ff_set_parameters(&ff->rx_stream, rate,
139 ff->spec->pcm_playback_channels[mode]);
143 err = ff->spec->protocol->allocate_resources(ff, rate);
151 int snd_ff_stream_start_duplex(struct snd_ff *ff, unsigned int rate)
155 if (ff->substreams_counter == 0)
158 if (amdtp_streaming_error(&ff->tx_stream) ||
159 amdtp_streaming_error(&ff->rx_stream))
163 * Regardless of current source of clock signal, drivers transfer some
164 * packets. Then, the device transfers packets.
166 if (!amdtp_stream_running(&ff->rx_stream)) {
167 err = ff->spec->protocol->begin_session(ff, rate);
171 err = amdtp_stream_start(&ff->rx_stream,
172 ff->rx_resources.channel,
173 fw_parent_device(ff->unit)->max_speed);
177 if (!amdtp_stream_wait_callback(&ff->rx_stream,
178 CALLBACK_TIMEOUT_MS)) {
183 err = ff->spec->protocol->switch_fetching_mode(ff, true);
188 if (!amdtp_stream_running(&ff->tx_stream)) {
189 err = amdtp_stream_start(&ff->tx_stream,
190 ff->tx_resources.channel,
191 fw_parent_device(ff->unit)->max_speed);
195 if (!amdtp_stream_wait_callback(&ff->tx_stream,
196 CALLBACK_TIMEOUT_MS)) {
209 void snd_ff_stream_stop_duplex(struct snd_ff *ff)
211 if (ff->substreams_counter == 0) {
214 fw_iso_resources_free(&ff->tx_resources);
215 fw_iso_resources_free(&ff->rx_resources);
219 void snd_ff_stream_update_duplex(struct snd_ff *ff)
221 // The device discontinue to transfer packets.
222 amdtp_stream_pcm_abort(&ff->tx_stream);
223 amdtp_stream_stop(&ff->tx_stream);
225 amdtp_stream_pcm_abort(&ff->rx_stream);
226 amdtp_stream_stop(&ff->rx_stream);
229 void snd_ff_stream_lock_changed(struct snd_ff *ff)
231 ff->dev_lock_changed = true;
232 wake_up(&ff->hwdep_wait);
235 int snd_ff_stream_lock_try(struct snd_ff *ff)
239 spin_lock_irq(&ff->lock);
241 /* user land lock this */
242 if (ff->dev_lock_count < 0) {
247 /* this is the first time */
248 if (ff->dev_lock_count++ == 0)
249 snd_ff_stream_lock_changed(ff);
252 spin_unlock_irq(&ff->lock);
256 void snd_ff_stream_lock_release(struct snd_ff *ff)
258 spin_lock_irq(&ff->lock);
260 if (WARN_ON(ff->dev_lock_count <= 0))
262 if (--ff->dev_lock_count == 0)
263 snd_ff_stream_lock_changed(ff);
265 spin_unlock_irq(&ff->lock);