--- /dev/null
+/*
+ * fireworks_pcm.c - a part of driver for Fireworks based devices
+ *
+ * Copyright (c) 2009-2010 Clemens Ladisch
+ * Copyright (c) 2013-2014 Takashi Sakamoto
+ *
+ * Licensed under the terms of the GNU General Public License, version 2.
+ */
+#include "./fireworks.h"
+
+/*
+ * NOTE:
+ * Fireworks changes its AMDTP channels for PCM data according to its sampling
+ * rate. There are three modes. Here _XX is either _rx or _tx.
+ * 0: 32.0- 48.0 kHz then snd_efw_hwinfo.amdtp_XX_pcm_channels applied
+ * 1: 88.2- 96.0 kHz then snd_efw_hwinfo.amdtp_XX_pcm_channels_2x applied
+ * 2: 176.4-192.0 kHz then snd_efw_hwinfo.amdtp_XX_pcm_channels_4x applied
+ *
+ * The number of PCM channels for analog input and output are always fixed but
+ * the number of PCM channels for digital input and output are differed.
+ *
+ * Additionally, according to "AudioFire Owner's Manual Version 2.2", in some
+ * model, the number of PCM channels for digital input has more restriction
+ * depending on which digital interface is selected.
+ * - S/PDIF coaxial and optical : use input 1-2
+ * - ADAT optical at 32.0-48.0 kHz : use input 1-8
+ * - ADAT optical at 88.2-96.0 kHz : use input 1-4 (S/MUX format)
+ *
+ * The data in AMDTP channels for blank PCM channels are zero.
+ */
+static const unsigned int freq_table[] = {
+ /* multiplier mode 0 */
+ [0] = 32000,
+ [1] = 44100,
+ [2] = 48000,
+ /* multiplier mode 1 */
+ [3] = 88200,
+ [4] = 96000,
+ /* multiplier mode 2 */
+ [5] = 176400,
+ [6] = 192000,
+};
+
+static inline unsigned int
+get_multiplier_mode_with_index(unsigned int index)
+{
+ return ((int)index - 1) / 2;
+}
+
+int snd_efw_get_multiplier_mode(unsigned int sampling_rate, unsigned int *mode)
+{
+ unsigned int i;
+
+ for (i = 0; i < ARRAY_SIZE(freq_table); i++) {
+ if (freq_table[i] == sampling_rate) {
+ *mode = get_multiplier_mode_with_index(i);
+ return 0;
+ }
+ }
+
+ return -EINVAL;
+}
+
+static int
+hw_rule_rate(struct snd_pcm_hw_params *params, struct snd_pcm_hw_rule *rule)
+{
+ unsigned int *pcm_channels = rule->private;
+ struct snd_interval *r =
+ hw_param_interval(params, SNDRV_PCM_HW_PARAM_RATE);
+ const struct snd_interval *c =
+ hw_param_interval_c(params, SNDRV_PCM_HW_PARAM_CHANNELS);
+ struct snd_interval t = {
+ .min = UINT_MAX, .max = 0, .integer = 1
+ };
+ unsigned int i, mode;
+
+ for (i = 0; i < ARRAY_SIZE(freq_table); i++) {
+ mode = get_multiplier_mode_with_index(i);
+ if (!snd_interval_test(c, pcm_channels[mode]))
+ continue;
+
+ t.min = min(t.min, freq_table[i]);
+ t.max = max(t.max, freq_table[i]);
+ }
+
+ return snd_interval_refine(r, &t);
+}
+
+static int
+hw_rule_channels(struct snd_pcm_hw_params *params, struct snd_pcm_hw_rule *rule)
+{
+ unsigned int *pcm_channels = rule->private;
+ struct snd_interval *c =
+ hw_param_interval(params, SNDRV_PCM_HW_PARAM_CHANNELS);
+ const struct snd_interval *r =
+ hw_param_interval_c(params, SNDRV_PCM_HW_PARAM_RATE);
+ struct snd_interval t = {
+ .min = UINT_MAX, .max = 0, .integer = 1
+ };
+ unsigned int i, mode;
+
+ for (i = 0; i < ARRAY_SIZE(freq_table); i++) {
+ mode = get_multiplier_mode_with_index(i);
+ if (!snd_interval_test(r, freq_table[i]))
+ continue;
+
+ t.min = min(t.min, pcm_channels[mode]);
+ t.max = max(t.max, pcm_channels[mode]);
+ }
+
+ return snd_interval_refine(c, &t);
+}
+
+static void
+limit_channels(struct snd_pcm_hardware *hw, unsigned int *pcm_channels)
+{
+ unsigned int i, mode;
+
+ hw->channels_min = UINT_MAX;
+ hw->channels_max = 0;
+
+ for (i = 0; i < ARRAY_SIZE(freq_table); i++) {
+ mode = get_multiplier_mode_with_index(i);
+ if (pcm_channels[mode] == 0)
+ continue;
+
+ hw->channels_min = min(hw->channels_min, pcm_channels[mode]);
+ hw->channels_max = max(hw->channels_max, pcm_channels[mode]);
+ }
+}
+
+static void
+limit_period_and_buffer(struct snd_pcm_hardware *hw)
+{
+ hw->periods_min = 2; /* SNDRV_PCM_INFO_BATCH */
+ hw->periods_max = UINT_MAX;
+
+ hw->period_bytes_min = 4 * hw->channels_max; /* bytes for a frame */
+
+ /* Just to prevent from allocating much pages. */
+ hw->period_bytes_max = hw->period_bytes_min * 2048;
+ hw->buffer_bytes_max = hw->period_bytes_max * hw->periods_min;
+}
+
+static int
+pcm_init_hw_params(struct snd_efw *efw,
+ struct snd_pcm_substream *substream)
+{
+ struct snd_pcm_runtime *runtime = substream->runtime;
+ struct amdtp_stream *s;
+ unsigned int *pcm_channels;
+ int err;
+
+ runtime->hw.info = SNDRV_PCM_INFO_BATCH |
+ SNDRV_PCM_INFO_BLOCK_TRANSFER |
+ SNDRV_PCM_INFO_INTERLEAVED |
+ SNDRV_PCM_INFO_JOINT_DUPLEX |
+ SNDRV_PCM_INFO_MMAP |
+ SNDRV_PCM_INFO_MMAP_VALID;
+
+ if (substream->stream == SNDRV_PCM_STREAM_CAPTURE) {
+ runtime->hw.formats = AMDTP_IN_PCM_FORMAT_BITS;
+ s = &efw->tx_stream;
+ pcm_channels = efw->pcm_capture_channels;
+ } else {
+ runtime->hw.formats = AMDTP_OUT_PCM_FORMAT_BITS;
+ s = &efw->rx_stream;
+ pcm_channels = efw->pcm_playback_channels;
+ }
+
+ /* limit rates */
+ runtime->hw.rates = efw->supported_sampling_rate,
+ snd_pcm_limit_hw_rates(runtime);
+
+ limit_channels(&runtime->hw, pcm_channels);
+ limit_period_and_buffer(&runtime->hw);
+
+ err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_CHANNELS,
+ hw_rule_channels, pcm_channels,
+ SNDRV_PCM_HW_PARAM_RATE, -1);
+ if (err < 0)
+ goto end;
+
+ err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_RATE,
+ hw_rule_rate, pcm_channels,
+ SNDRV_PCM_HW_PARAM_CHANNELS, -1);
+ if (err < 0)
+ goto end;
+
+ err = amdtp_stream_add_pcm_hw_constraints(s, runtime);
+end:
+ return err;
+}
+
+static int pcm_open(struct snd_pcm_substream *substream)
+{
+ struct snd_efw *efw = substream->private_data;
+ int sampling_rate;
+ unsigned int clock_source;
+ int err;
+
+ err = pcm_init_hw_params(efw, substream);
+ if (err < 0)
+ goto end;
+
+ err = snd_efw_command_get_clock_source(efw, &clock_source);
+ if (err < 0)
+ goto end;
+
+ /*
+ * When source of clock is not internal or any PCM streams are running,
+ * available sampling rate is limited at current sampling rate.
+ */
+ if ((clock_source != SND_EFW_CLOCK_SOURCE_INTERNAL) ||
+ amdtp_stream_pcm_running(&efw->tx_stream) ||
+ amdtp_stream_pcm_running(&efw->rx_stream)) {
+ err = snd_efw_command_get_sampling_rate(efw, &sampling_rate);
+ if (err < 0)
+ goto end;
+ substream->runtime->hw.rate_min = sampling_rate;
+ substream->runtime->hw.rate_max = sampling_rate;
+ }
+
+ snd_pcm_set_sync(substream);
+end:
+ return err;
+}
+
+static int pcm_close(struct snd_pcm_substream *substream)
+{
+ return 0;
+}
+
+static int pcm_capture_hw_params(struct snd_pcm_substream *substream,
+ struct snd_pcm_hw_params *hw_params)
+{
+ struct snd_efw *efw = substream->private_data;
+
+ if (substream->runtime->status->state == SNDRV_PCM_STATE_OPEN)
+ atomic_inc(&efw->capture_substreams);
+ amdtp_stream_set_pcm_format(&efw->tx_stream, params_format(hw_params));
+
+ return snd_pcm_lib_alloc_vmalloc_buffer(substream,
+ params_buffer_bytes(hw_params));
+}
+static int pcm_playback_hw_params(struct snd_pcm_substream *substream,
+ struct snd_pcm_hw_params *hw_params)
+{
+ struct snd_efw *efw = substream->private_data;
+
+ if (substream->runtime->status->state == SNDRV_PCM_STATE_OPEN)
+ atomic_inc(&efw->playback_substreams);
+ amdtp_stream_set_pcm_format(&efw->rx_stream, params_format(hw_params));
+
+ return snd_pcm_lib_alloc_vmalloc_buffer(substream,
+ params_buffer_bytes(hw_params));
+}
+
+static int pcm_capture_hw_free(struct snd_pcm_substream *substream)
+{
+ struct snd_efw *efw = substream->private_data;
+
+ if (substream->runtime->status->state != SNDRV_PCM_STATE_OPEN)
+ atomic_dec(&efw->capture_substreams);
+
+ snd_efw_stream_stop_duplex(efw);
+
+ return snd_pcm_lib_free_vmalloc_buffer(substream);
+}
+static int pcm_playback_hw_free(struct snd_pcm_substream *substream)
+{
+ struct snd_efw *efw = substream->private_data;
+
+ if (substream->runtime->status->state != SNDRV_PCM_STATE_OPEN)
+ atomic_dec(&efw->playback_substreams);
+
+ snd_efw_stream_stop_duplex(efw);
+
+ return snd_pcm_lib_free_vmalloc_buffer(substream);
+}
+
+static int pcm_capture_prepare(struct snd_pcm_substream *substream)
+{
+ struct snd_efw *efw = substream->private_data;
+ struct snd_pcm_runtime *runtime = substream->runtime;
+ int err;
+
+ err = snd_efw_stream_start_duplex(efw, runtime->rate);
+ if (err >= 0)
+ amdtp_stream_pcm_prepare(&efw->tx_stream);
+
+ return err;
+}
+static int pcm_playback_prepare(struct snd_pcm_substream *substream)
+{
+ struct snd_efw *efw = substream->private_data;
+ struct snd_pcm_runtime *runtime = substream->runtime;
+ int err;
+
+ err = snd_efw_stream_start_duplex(efw, runtime->rate);
+ if (err >= 0)
+ amdtp_stream_pcm_prepare(&efw->rx_stream);
+
+ return err;
+}
+
+static int pcm_capture_trigger(struct snd_pcm_substream *substream, int cmd)
+{
+ struct snd_efw *efw = substream->private_data;
+
+ switch (cmd) {
+ case SNDRV_PCM_TRIGGER_START:
+ amdtp_stream_pcm_trigger(&efw->tx_stream, substream);
+ break;
+ case SNDRV_PCM_TRIGGER_STOP:
+ amdtp_stream_pcm_trigger(&efw->tx_stream, NULL);
+ break;
+ default:
+ return -EINVAL;
+ }
+
+ return 0;
+}
+static int pcm_playback_trigger(struct snd_pcm_substream *substream, int cmd)
+{
+ struct snd_efw *efw = substream->private_data;
+
+ switch (cmd) {
+ case SNDRV_PCM_TRIGGER_START:
+ amdtp_stream_pcm_trigger(&efw->rx_stream, substream);
+ break;
+ case SNDRV_PCM_TRIGGER_STOP:
+ amdtp_stream_pcm_trigger(&efw->rx_stream, NULL);
+ break;
+ default:
+ return -EINVAL;
+ }
+
+ return 0;
+}
+
+static snd_pcm_uframes_t pcm_capture_pointer(struct snd_pcm_substream *sbstrm)
+{
+ struct snd_efw *efw = sbstrm->private_data;
+ return amdtp_stream_pcm_pointer(&efw->tx_stream);
+}
+static snd_pcm_uframes_t pcm_playback_pointer(struct snd_pcm_substream *sbstrm)
+{
+ struct snd_efw *efw = sbstrm->private_data;
+ return amdtp_stream_pcm_pointer(&efw->rx_stream);
+}
+
+static const struct snd_pcm_ops pcm_capture_ops = {
+ .open = pcm_open,
+ .close = pcm_close,
+ .ioctl = snd_pcm_lib_ioctl,
+ .hw_params = pcm_capture_hw_params,
+ .hw_free = pcm_capture_hw_free,
+ .prepare = pcm_capture_prepare,
+ .trigger = pcm_capture_trigger,
+ .pointer = pcm_capture_pointer,
+ .page = snd_pcm_lib_get_vmalloc_page,
+};
+
+static const struct snd_pcm_ops pcm_playback_ops = {
+ .open = pcm_open,
+ .close = pcm_close,
+ .ioctl = snd_pcm_lib_ioctl,
+ .hw_params = pcm_playback_hw_params,
+ .hw_free = pcm_playback_hw_free,
+ .prepare = pcm_playback_prepare,
+ .trigger = pcm_playback_trigger,
+ .pointer = pcm_playback_pointer,
+ .page = snd_pcm_lib_get_vmalloc_page,
+ .mmap = snd_pcm_lib_mmap_vmalloc,
+};
+
+int snd_efw_create_pcm_devices(struct snd_efw *efw)
+{
+ struct snd_pcm *pcm;
+ int err;
+
+ err = snd_pcm_new(efw->card, efw->card->driver, 0, 1, 1, &pcm);
+ if (err < 0)
+ goto end;
+
+ pcm->private_data = efw;
+ snprintf(pcm->name, sizeof(pcm->name), "%s PCM", efw->card->shortname);
+ snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_PLAYBACK, &pcm_playback_ops);
+ snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_CAPTURE, &pcm_capture_ops);
+end:
+ return err;
+}
+
projects / platform / kernel / linux-rpi3.git / commitdiff