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436 lines
12 KiB
436 lines
12 KiB
// SPDX-License-Identifier: GPL-2.0-only |
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/* |
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* Copyright (C) STMicroelectronics SA 2015 |
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* Authors: Arnaud Pouliquen <[email protected]> |
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* for STMicroelectronics. |
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*/ |
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#include <sound/soc.h> |
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#include "uniperif.h" |
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#define UNIPERIF_READER_I2S_IN 0 /* reader id connected to I2S/TDM TX bus */ |
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/* |
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* Note: snd_pcm_hardware is linked to DMA controller but is declared here to |
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* integrate unireader capability in term of rate and supported channels |
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*/ |
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static const struct snd_pcm_hardware uni_reader_pcm_hw = { |
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.info = SNDRV_PCM_INFO_INTERLEAVED | SNDRV_PCM_INFO_BLOCK_TRANSFER | |
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SNDRV_PCM_INFO_PAUSE | SNDRV_PCM_INFO_MMAP | |
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SNDRV_PCM_INFO_MMAP_VALID, |
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.formats = SNDRV_PCM_FMTBIT_S32_LE | SNDRV_PCM_FMTBIT_S16_LE, |
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.rates = SNDRV_PCM_RATE_CONTINUOUS, |
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.rate_min = 8000, |
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.rate_max = 96000, |
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.channels_min = 2, |
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.channels_max = 8, |
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.periods_min = 2, |
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.periods_max = 48, |
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.period_bytes_min = 128, |
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.period_bytes_max = 64 * PAGE_SIZE, |
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.buffer_bytes_max = 256 * PAGE_SIZE |
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}; |
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/* |
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* uni_reader_irq_handler |
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* In case of error audio stream is stopped; stop action is protected via PCM |
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* stream lock to avoid race condition with trigger callback. |
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*/ |
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static irqreturn_t uni_reader_irq_handler(int irq, void *dev_id) |
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{ |
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irqreturn_t ret = IRQ_NONE; |
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struct uniperif *reader = dev_id; |
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unsigned int status; |
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spin_lock(&reader->irq_lock); |
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if (!reader->substream) |
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goto irq_spin_unlock; |
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snd_pcm_stream_lock(reader->substream); |
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if (reader->state == UNIPERIF_STATE_STOPPED) { |
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/* Unexpected IRQ: do nothing */ |
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dev_warn(reader->dev, "unexpected IRQ\n"); |
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goto stream_unlock; |
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} |
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/* Get interrupt status & clear them immediately */ |
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status = GET_UNIPERIF_ITS(reader); |
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SET_UNIPERIF_ITS_BCLR(reader, status); |
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/* Check for fifo overflow error */ |
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if (unlikely(status & UNIPERIF_ITS_FIFO_ERROR_MASK(reader))) { |
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dev_err(reader->dev, "FIFO error detected\n"); |
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snd_pcm_stop_xrun(reader->substream); |
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ret = IRQ_HANDLED; |
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} |
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stream_unlock: |
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snd_pcm_stream_unlock(reader->substream); |
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irq_spin_unlock: |
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spin_unlock(&reader->irq_lock); |
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return ret; |
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} |
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static int uni_reader_prepare_pcm(struct snd_pcm_runtime *runtime, |
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struct uniperif *reader) |
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{ |
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int slot_width; |
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/* Force slot width to 32 in I2S mode */ |
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if ((reader->daifmt & SND_SOC_DAIFMT_FORMAT_MASK) |
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== SND_SOC_DAIFMT_I2S) { |
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slot_width = 32; |
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} else { |
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switch (runtime->format) { |
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case SNDRV_PCM_FORMAT_S16_LE: |
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slot_width = 16; |
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break; |
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default: |
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slot_width = 32; |
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break; |
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} |
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} |
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/* Number of bits per subframe (i.e one channel sample) on input. */ |
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switch (slot_width) { |
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case 32: |
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SET_UNIPERIF_I2S_FMT_NBIT_32(reader); |
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SET_UNIPERIF_I2S_FMT_DATA_SIZE_32(reader); |
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break; |
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case 16: |
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SET_UNIPERIF_I2S_FMT_NBIT_16(reader); |
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SET_UNIPERIF_I2S_FMT_DATA_SIZE_16(reader); |
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break; |
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default: |
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dev_err(reader->dev, "subframe format not supported\n"); |
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return -EINVAL; |
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} |
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/* Configure data memory format */ |
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switch (runtime->format) { |
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case SNDRV_PCM_FORMAT_S16_LE: |
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/* One data word contains two samples */ |
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SET_UNIPERIF_CONFIG_MEM_FMT_16_16(reader); |
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break; |
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case SNDRV_PCM_FORMAT_S32_LE: |
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/* |
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* Actually "16 bits/0 bits" means "32/28/24/20/18/16 bits |
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* on the MSB then zeros (if less than 32 bytes)"... |
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*/ |
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SET_UNIPERIF_CONFIG_MEM_FMT_16_0(reader); |
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break; |
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default: |
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dev_err(reader->dev, "format not supported\n"); |
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return -EINVAL; |
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} |
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/* Number of channels must be even */ |
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if ((runtime->channels % 2) || (runtime->channels < 2) || |
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(runtime->channels > 10)) { |
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dev_err(reader->dev, "%s: invalid nb of channels\n", __func__); |
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return -EINVAL; |
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} |
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SET_UNIPERIF_I2S_FMT_NUM_CH(reader, runtime->channels / 2); |
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SET_UNIPERIF_I2S_FMT_ORDER_MSB(reader); |
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return 0; |
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} |
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static int uni_reader_prepare_tdm(struct snd_pcm_runtime *runtime, |
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struct uniperif *reader) |
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{ |
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int frame_size; /* user tdm frame size in bytes */ |
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/* default unip TDM_WORD_POS_X_Y */ |
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unsigned int word_pos[4] = { |
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0x04060002, 0x0C0E080A, 0x14161012, 0x1C1E181A}; |
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frame_size = sti_uniperiph_get_user_frame_size(runtime); |
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/* fix 16/0 format */ |
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SET_UNIPERIF_CONFIG_MEM_FMT_16_0(reader); |
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SET_UNIPERIF_I2S_FMT_DATA_SIZE_32(reader); |
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/* number of words inserted on the TDM line */ |
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SET_UNIPERIF_I2S_FMT_NUM_CH(reader, frame_size / 4 / 2); |
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SET_UNIPERIF_I2S_FMT_ORDER_MSB(reader); |
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SET_UNIPERIF_I2S_FMT_ALIGN_LEFT(reader); |
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SET_UNIPERIF_TDM_ENABLE_TDM_ENABLE(reader); |
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/* |
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* set the timeslots allocation for words in FIFO |
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* |
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* HW bug: (LSB word < MSB word) => this config is not possible |
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* So if we want (LSB word < MSB) word, then it shall be |
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* handled by user |
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*/ |
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sti_uniperiph_get_tdm_word_pos(reader, word_pos); |
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SET_UNIPERIF_TDM_WORD_POS(reader, 1_2, word_pos[WORD_1_2]); |
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SET_UNIPERIF_TDM_WORD_POS(reader, 3_4, word_pos[WORD_3_4]); |
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SET_UNIPERIF_TDM_WORD_POS(reader, 5_6, word_pos[WORD_5_6]); |
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SET_UNIPERIF_TDM_WORD_POS(reader, 7_8, word_pos[WORD_7_8]); |
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return 0; |
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} |
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static int uni_reader_prepare(struct snd_pcm_substream *substream, |
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struct snd_soc_dai *dai) |
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{ |
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struct sti_uniperiph_data *priv = snd_soc_dai_get_drvdata(dai); |
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struct uniperif *reader = priv->dai_data.uni; |
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struct snd_pcm_runtime *runtime = substream->runtime; |
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int transfer_size, trigger_limit, ret; |
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/* The reader should be stopped */ |
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if (reader->state != UNIPERIF_STATE_STOPPED) { |
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dev_err(reader->dev, "%s: invalid reader state %d\n", __func__, |
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reader->state); |
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return -EINVAL; |
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} |
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/* Calculate transfer size (in fifo cells and bytes) for frame count */ |
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if (reader->type == SND_ST_UNIPERIF_TYPE_TDM) { |
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/* transfer size = unip frame size (in 32 bits FIFO cell) */ |
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transfer_size = |
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sti_uniperiph_get_user_frame_size(runtime) / 4; |
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} else { |
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transfer_size = runtime->channels * UNIPERIF_FIFO_FRAMES; |
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} |
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/* Calculate number of empty cells available before asserting DREQ */ |
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if (reader->ver < SND_ST_UNIPERIF_VERSION_UNI_PLR_TOP_1_0) |
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trigger_limit = UNIPERIF_FIFO_SIZE - transfer_size; |
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else |
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/* |
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* Since SND_ST_UNIPERIF_VERSION_UNI_PLR_TOP_1_0 |
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* FDMA_TRIGGER_LIMIT also controls when the state switches |
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* from OFF or STANDBY to AUDIO DATA. |
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*/ |
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trigger_limit = transfer_size; |
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/* Trigger limit must be an even number */ |
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if ((!trigger_limit % 2) || |
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(trigger_limit != 1 && transfer_size % 2) || |
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(trigger_limit > UNIPERIF_CONFIG_DMA_TRIG_LIMIT_MASK(reader))) { |
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dev_err(reader->dev, "invalid trigger limit %d\n", |
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trigger_limit); |
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return -EINVAL; |
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} |
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SET_UNIPERIF_CONFIG_DMA_TRIG_LIMIT(reader, trigger_limit); |
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if (UNIPERIF_TYPE_IS_TDM(reader)) |
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ret = uni_reader_prepare_tdm(runtime, reader); |
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else |
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ret = uni_reader_prepare_pcm(runtime, reader); |
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if (ret) |
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return ret; |
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switch (reader->daifmt & SND_SOC_DAIFMT_FORMAT_MASK) { |
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case SND_SOC_DAIFMT_I2S: |
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SET_UNIPERIF_I2S_FMT_ALIGN_LEFT(reader); |
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SET_UNIPERIF_I2S_FMT_PADDING_I2S_MODE(reader); |
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break; |
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case SND_SOC_DAIFMT_LEFT_J: |
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SET_UNIPERIF_I2S_FMT_ALIGN_LEFT(reader); |
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SET_UNIPERIF_I2S_FMT_PADDING_SONY_MODE(reader); |
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break; |
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case SND_SOC_DAIFMT_RIGHT_J: |
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SET_UNIPERIF_I2S_FMT_ALIGN_RIGHT(reader); |
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SET_UNIPERIF_I2S_FMT_PADDING_SONY_MODE(reader); |
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break; |
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default: |
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dev_err(reader->dev, "format not supported\n"); |
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return -EINVAL; |
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} |
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/* Data clocking (changing) on the rising/falling edge */ |
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switch (reader->daifmt & SND_SOC_DAIFMT_INV_MASK) { |
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case SND_SOC_DAIFMT_NB_NF: |
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SET_UNIPERIF_I2S_FMT_LR_POL_LOW(reader); |
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SET_UNIPERIF_I2S_FMT_SCLK_EDGE_RISING(reader); |
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break; |
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case SND_SOC_DAIFMT_NB_IF: |
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SET_UNIPERIF_I2S_FMT_LR_POL_HIG(reader); |
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SET_UNIPERIF_I2S_FMT_SCLK_EDGE_RISING(reader); |
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break; |
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case SND_SOC_DAIFMT_IB_NF: |
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SET_UNIPERIF_I2S_FMT_LR_POL_LOW(reader); |
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SET_UNIPERIF_I2S_FMT_SCLK_EDGE_FALLING(reader); |
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break; |
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case SND_SOC_DAIFMT_IB_IF: |
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SET_UNIPERIF_I2S_FMT_LR_POL_HIG(reader); |
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SET_UNIPERIF_I2S_FMT_SCLK_EDGE_FALLING(reader); |
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break; |
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} |
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/* Clear any pending interrupts */ |
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SET_UNIPERIF_ITS_BCLR(reader, GET_UNIPERIF_ITS(reader)); |
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SET_UNIPERIF_I2S_FMT_NO_OF_SAMPLES_TO_READ(reader, 0); |
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/* Set the interrupt mask */ |
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SET_UNIPERIF_ITM_BSET_DMA_ERROR(reader); |
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SET_UNIPERIF_ITM_BSET_FIFO_ERROR(reader); |
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SET_UNIPERIF_ITM_BSET_MEM_BLK_READ(reader); |
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/* Enable underflow recovery interrupts */ |
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if (reader->underflow_enabled) { |
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SET_UNIPERIF_ITM_BSET_UNDERFLOW_REC_DONE(reader); |
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SET_UNIPERIF_ITM_BSET_UNDERFLOW_REC_FAILED(reader); |
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} |
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/* Reset uniperipheral reader */ |
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return sti_uniperiph_reset(reader); |
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} |
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static int uni_reader_start(struct uniperif *reader) |
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{ |
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/* The reader should be stopped */ |
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if (reader->state != UNIPERIF_STATE_STOPPED) { |
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dev_err(reader->dev, "%s: invalid reader state\n", __func__); |
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return -EINVAL; |
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} |
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/* Enable reader interrupts (and clear possible stalled ones) */ |
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SET_UNIPERIF_ITS_BCLR_FIFO_ERROR(reader); |
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SET_UNIPERIF_ITM_BSET_FIFO_ERROR(reader); |
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/* Launch the reader */ |
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SET_UNIPERIF_CTRL_OPERATION_PCM_DATA(reader); |
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/* Update state to started */ |
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reader->state = UNIPERIF_STATE_STARTED; |
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return 0; |
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} |
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static int uni_reader_stop(struct uniperif *reader) |
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{ |
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/* The reader should not be in stopped state */ |
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if (reader->state == UNIPERIF_STATE_STOPPED) { |
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dev_err(reader->dev, "%s: invalid reader state\n", __func__); |
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return -EINVAL; |
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} |
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/* Turn the reader off */ |
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SET_UNIPERIF_CTRL_OPERATION_OFF(reader); |
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/* Disable interrupts */ |
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SET_UNIPERIF_ITM_BCLR(reader, GET_UNIPERIF_ITM(reader)); |
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/* Update state to stopped and return */ |
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reader->state = UNIPERIF_STATE_STOPPED; |
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return 0; |
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} |
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static int uni_reader_trigger(struct snd_pcm_substream *substream, |
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int cmd, struct snd_soc_dai *dai) |
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{ |
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struct sti_uniperiph_data *priv = snd_soc_dai_get_drvdata(dai); |
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struct uniperif *reader = priv->dai_data.uni; |
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switch (cmd) { |
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case SNDRV_PCM_TRIGGER_START: |
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return uni_reader_start(reader); |
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case SNDRV_PCM_TRIGGER_STOP: |
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return uni_reader_stop(reader); |
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default: |
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return -EINVAL; |
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} |
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} |
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static int uni_reader_startup(struct snd_pcm_substream *substream, |
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struct snd_soc_dai *dai) |
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{ |
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struct sti_uniperiph_data *priv = snd_soc_dai_get_drvdata(dai); |
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struct uniperif *reader = priv->dai_data.uni; |
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unsigned long flags; |
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int ret; |
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spin_lock_irqsave(&reader->irq_lock, flags); |
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reader->substream = substream; |
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spin_unlock_irqrestore(&reader->irq_lock, flags); |
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if (!UNIPERIF_TYPE_IS_TDM(reader)) |
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return 0; |
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/* refine hw constraint in tdm mode */ |
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ret = snd_pcm_hw_rule_add(substream->runtime, 0, |
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SNDRV_PCM_HW_PARAM_CHANNELS, |
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sti_uniperiph_fix_tdm_chan, |
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reader, SNDRV_PCM_HW_PARAM_CHANNELS, |
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-1); |
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if (ret < 0) |
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return ret; |
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return snd_pcm_hw_rule_add(substream->runtime, 0, |
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SNDRV_PCM_HW_PARAM_FORMAT, |
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sti_uniperiph_fix_tdm_format, |
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reader, SNDRV_PCM_HW_PARAM_FORMAT, |
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-1); |
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} |
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static void uni_reader_shutdown(struct snd_pcm_substream *substream, |
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struct snd_soc_dai *dai) |
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{ |
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struct sti_uniperiph_data *priv = snd_soc_dai_get_drvdata(dai); |
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struct uniperif *reader = priv->dai_data.uni; |
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unsigned long flags; |
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spin_lock_irqsave(&reader->irq_lock, flags); |
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if (reader->state != UNIPERIF_STATE_STOPPED) { |
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/* Stop the reader */ |
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uni_reader_stop(reader); |
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} |
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reader->substream = NULL; |
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spin_unlock_irqrestore(&reader->irq_lock, flags); |
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} |
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static const struct snd_soc_dai_ops uni_reader_dai_ops = { |
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.startup = uni_reader_startup, |
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.shutdown = uni_reader_shutdown, |
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.prepare = uni_reader_prepare, |
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.trigger = uni_reader_trigger, |
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.hw_params = sti_uniperiph_dai_hw_params, |
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.set_fmt = sti_uniperiph_dai_set_fmt, |
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.set_tdm_slot = sti_uniperiph_set_tdm_slot |
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}; |
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int uni_reader_init(struct platform_device *pdev, |
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struct uniperif *reader) |
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{ |
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int ret = 0; |
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reader->dev = &pdev->dev; |
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reader->state = UNIPERIF_STATE_STOPPED; |
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reader->dai_ops = &uni_reader_dai_ops; |
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if (UNIPERIF_TYPE_IS_TDM(reader)) |
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reader->hw = &uni_tdm_hw; |
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else |
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reader->hw = &uni_reader_pcm_hw; |
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ret = devm_request_irq(&pdev->dev, reader->irq, |
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uni_reader_irq_handler, IRQF_SHARED, |
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dev_name(&pdev->dev), reader); |
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if (ret < 0) { |
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dev_err(&pdev->dev, "Failed to request IRQ\n"); |
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return -EBUSY; |
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} |
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spin_lock_init(&reader->irq_lock); |
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return 0; |
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} |
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EXPORT_SYMBOL_GPL(uni_reader_init);
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