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515 lines
13 KiB
515 lines
13 KiB
// SPDX-License-Identifier: GPL-2.0-only |
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/* |
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* rt5514-spi.c -- RT5514 SPI driver |
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* |
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* Copyright 2015 Realtek Semiconductor Corp. |
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* Author: Oder Chiou <[email protected]> |
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*/ |
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#include <linux/module.h> |
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#include <linux/input.h> |
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#include <linux/spi/spi.h> |
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#include <linux/device.h> |
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#include <linux/init.h> |
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#include <linux/delay.h> |
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#include <linux/interrupt.h> |
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#include <linux/irq.h> |
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#include <linux/slab.h> |
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#include <linux/gpio.h> |
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#include <linux/sched.h> |
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#include <linux/uaccess.h> |
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#include <linux/regulator/consumer.h> |
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#include <linux/pm_qos.h> |
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#include <linux/sysfs.h> |
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#include <linux/clk.h> |
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#include <sound/core.h> |
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#include <sound/pcm.h> |
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#include <sound/pcm_params.h> |
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#include <sound/soc.h> |
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#include <sound/soc-dapm.h> |
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#include <sound/initval.h> |
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#include <sound/tlv.h> |
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#include "rt5514-spi.h" |
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#define DRV_NAME "rt5514-spi" |
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static struct spi_device *rt5514_spi; |
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struct rt5514_dsp { |
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struct device *dev; |
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struct delayed_work copy_work; |
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struct mutex dma_lock; |
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struct snd_pcm_substream *substream; |
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unsigned int buf_base, buf_limit, buf_rp; |
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size_t buf_size, get_size, dma_offset; |
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}; |
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static const struct snd_pcm_hardware rt5514_spi_pcm_hardware = { |
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.info = SNDRV_PCM_INFO_MMAP | |
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SNDRV_PCM_INFO_MMAP_VALID | |
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SNDRV_PCM_INFO_INTERLEAVED, |
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.formats = SNDRV_PCM_FMTBIT_S16_LE, |
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.period_bytes_min = PAGE_SIZE, |
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.period_bytes_max = 0x20000 / 8, |
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.periods_min = 8, |
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.periods_max = 8, |
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.channels_min = 1, |
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.channels_max = 1, |
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.buffer_bytes_max = 0x20000, |
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}; |
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static struct snd_soc_dai_driver rt5514_spi_dai = { |
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.name = "rt5514-dsp-cpu-dai", |
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.id = 0, |
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.capture = { |
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.stream_name = "DSP Capture", |
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.channels_min = 1, |
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.channels_max = 1, |
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.rates = SNDRV_PCM_RATE_16000, |
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.formats = SNDRV_PCM_FMTBIT_S16_LE, |
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}, |
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}; |
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static void rt5514_spi_copy_work(struct work_struct *work) |
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{ |
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struct rt5514_dsp *rt5514_dsp = |
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container_of(work, struct rt5514_dsp, copy_work.work); |
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struct snd_pcm_runtime *runtime; |
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size_t period_bytes, truncated_bytes = 0; |
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unsigned int cur_wp, remain_data; |
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u8 buf[8]; |
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mutex_lock(&rt5514_dsp->dma_lock); |
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if (!rt5514_dsp->substream) { |
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dev_err(rt5514_dsp->dev, "No pcm substream\n"); |
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goto done; |
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} |
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runtime = rt5514_dsp->substream->runtime; |
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period_bytes = snd_pcm_lib_period_bytes(rt5514_dsp->substream); |
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if (!period_bytes) { |
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schedule_delayed_work(&rt5514_dsp->copy_work, 5); |
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goto done; |
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} |
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if (rt5514_dsp->buf_size % period_bytes) |
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rt5514_dsp->buf_size = (rt5514_dsp->buf_size / period_bytes) * |
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period_bytes; |
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if (rt5514_dsp->get_size >= rt5514_dsp->buf_size) { |
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rt5514_spi_burst_read(RT5514_BUFFER_VOICE_WP, (u8 *)&buf, |
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sizeof(buf)); |
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cur_wp = buf[0] | buf[1] << 8 | buf[2] << 16 | |
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buf[3] << 24; |
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if (cur_wp >= rt5514_dsp->buf_rp) |
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remain_data = (cur_wp - rt5514_dsp->buf_rp); |
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else |
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remain_data = |
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(rt5514_dsp->buf_limit - rt5514_dsp->buf_rp) + |
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(cur_wp - rt5514_dsp->buf_base); |
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if (remain_data < period_bytes) { |
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schedule_delayed_work(&rt5514_dsp->copy_work, 5); |
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goto done; |
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} |
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} |
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if (rt5514_dsp->buf_rp + period_bytes <= rt5514_dsp->buf_limit) { |
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rt5514_spi_burst_read(rt5514_dsp->buf_rp, |
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runtime->dma_area + rt5514_dsp->dma_offset, |
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period_bytes); |
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if (rt5514_dsp->buf_rp + period_bytes == rt5514_dsp->buf_limit) |
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rt5514_dsp->buf_rp = rt5514_dsp->buf_base; |
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else |
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rt5514_dsp->buf_rp += period_bytes; |
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} else { |
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truncated_bytes = rt5514_dsp->buf_limit - rt5514_dsp->buf_rp; |
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rt5514_spi_burst_read(rt5514_dsp->buf_rp, |
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runtime->dma_area + rt5514_dsp->dma_offset, |
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truncated_bytes); |
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rt5514_spi_burst_read(rt5514_dsp->buf_base, |
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runtime->dma_area + rt5514_dsp->dma_offset + |
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truncated_bytes, period_bytes - truncated_bytes); |
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rt5514_dsp->buf_rp = rt5514_dsp->buf_base + period_bytes - |
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truncated_bytes; |
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} |
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rt5514_dsp->get_size += period_bytes; |
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rt5514_dsp->dma_offset += period_bytes; |
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if (rt5514_dsp->dma_offset >= runtime->dma_bytes) |
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rt5514_dsp->dma_offset = 0; |
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snd_pcm_period_elapsed(rt5514_dsp->substream); |
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schedule_delayed_work(&rt5514_dsp->copy_work, 5); |
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done: |
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mutex_unlock(&rt5514_dsp->dma_lock); |
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} |
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static void rt5514_schedule_copy(struct rt5514_dsp *rt5514_dsp) |
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{ |
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u8 buf[8]; |
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if (!rt5514_dsp->substream) |
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return; |
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rt5514_dsp->get_size = 0; |
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/** |
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* The address area x1800XXXX is the register address, and it cannot |
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* support spi burst read perfectly. So we use the spi burst read |
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* individually to make sure the data correctly. |
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*/ |
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rt5514_spi_burst_read(RT5514_BUFFER_VOICE_BASE, (u8 *)&buf, |
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sizeof(buf)); |
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rt5514_dsp->buf_base = buf[0] | buf[1] << 8 | buf[2] << 16 | |
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buf[3] << 24; |
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rt5514_spi_burst_read(RT5514_BUFFER_VOICE_LIMIT, (u8 *)&buf, |
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sizeof(buf)); |
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rt5514_dsp->buf_limit = buf[0] | buf[1] << 8 | buf[2] << 16 | |
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buf[3] << 24; |
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rt5514_spi_burst_read(RT5514_BUFFER_VOICE_WP, (u8 *)&buf, |
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sizeof(buf)); |
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rt5514_dsp->buf_rp = buf[0] | buf[1] << 8 | buf[2] << 16 | |
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buf[3] << 24; |
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if (rt5514_dsp->buf_rp % 8) |
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rt5514_dsp->buf_rp = (rt5514_dsp->buf_rp / 8) * 8; |
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rt5514_dsp->buf_size = rt5514_dsp->buf_limit - rt5514_dsp->buf_base; |
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if (rt5514_dsp->buf_base && rt5514_dsp->buf_limit && |
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rt5514_dsp->buf_rp && rt5514_dsp->buf_size) |
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schedule_delayed_work(&rt5514_dsp->copy_work, 0); |
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} |
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static irqreturn_t rt5514_spi_irq(int irq, void *data) |
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{ |
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struct rt5514_dsp *rt5514_dsp = data; |
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rt5514_schedule_copy(rt5514_dsp); |
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return IRQ_HANDLED; |
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} |
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/* PCM for streaming audio from the DSP buffer */ |
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static int rt5514_spi_pcm_open(struct snd_soc_component *component, |
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struct snd_pcm_substream *substream) |
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{ |
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snd_soc_set_runtime_hwparams(substream, &rt5514_spi_pcm_hardware); |
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return 0; |
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} |
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static int rt5514_spi_hw_params(struct snd_soc_component *component, |
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struct snd_pcm_substream *substream, |
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struct snd_pcm_hw_params *hw_params) |
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{ |
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struct rt5514_dsp *rt5514_dsp = |
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snd_soc_component_get_drvdata(component); |
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u8 buf[8]; |
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mutex_lock(&rt5514_dsp->dma_lock); |
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rt5514_dsp->substream = substream; |
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rt5514_dsp->dma_offset = 0; |
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/* Read IRQ status and schedule copy accordingly. */ |
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rt5514_spi_burst_read(RT5514_IRQ_CTRL, (u8 *)&buf, sizeof(buf)); |
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if (buf[0] & RT5514_IRQ_STATUS_BIT) |
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rt5514_schedule_copy(rt5514_dsp); |
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mutex_unlock(&rt5514_dsp->dma_lock); |
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return 0; |
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} |
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static int rt5514_spi_hw_free(struct snd_soc_component *component, |
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struct snd_pcm_substream *substream) |
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{ |
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struct rt5514_dsp *rt5514_dsp = |
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snd_soc_component_get_drvdata(component); |
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mutex_lock(&rt5514_dsp->dma_lock); |
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rt5514_dsp->substream = NULL; |
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mutex_unlock(&rt5514_dsp->dma_lock); |
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cancel_delayed_work_sync(&rt5514_dsp->copy_work); |
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return 0; |
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} |
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static snd_pcm_uframes_t rt5514_spi_pcm_pointer( |
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struct snd_soc_component *component, |
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struct snd_pcm_substream *substream) |
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{ |
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struct snd_pcm_runtime *runtime = substream->runtime; |
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struct rt5514_dsp *rt5514_dsp = |
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snd_soc_component_get_drvdata(component); |
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return bytes_to_frames(runtime, rt5514_dsp->dma_offset); |
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} |
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static int rt5514_spi_pcm_probe(struct snd_soc_component *component) |
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{ |
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struct rt5514_dsp *rt5514_dsp; |
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int ret; |
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rt5514_dsp = devm_kzalloc(component->dev, sizeof(*rt5514_dsp), |
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GFP_KERNEL); |
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if (!rt5514_dsp) |
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return -ENOMEM; |
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rt5514_dsp->dev = &rt5514_spi->dev; |
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mutex_init(&rt5514_dsp->dma_lock); |
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INIT_DELAYED_WORK(&rt5514_dsp->copy_work, rt5514_spi_copy_work); |
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snd_soc_component_set_drvdata(component, rt5514_dsp); |
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if (rt5514_spi->irq) { |
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ret = devm_request_threaded_irq(&rt5514_spi->dev, |
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rt5514_spi->irq, NULL, rt5514_spi_irq, |
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IRQF_TRIGGER_RISING | IRQF_ONESHOT, "rt5514-spi", |
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rt5514_dsp); |
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if (ret) |
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dev_err(&rt5514_spi->dev, |
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"%s Failed to reguest IRQ: %d\n", __func__, |
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ret); |
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else |
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device_init_wakeup(rt5514_dsp->dev, true); |
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} |
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return 0; |
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} |
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static int rt5514_spi_pcm_new(struct snd_soc_component *component, |
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struct snd_soc_pcm_runtime *rtd) |
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{ |
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snd_pcm_set_managed_buffer_all(rtd->pcm, SNDRV_DMA_TYPE_VMALLOC, |
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NULL, 0, 0); |
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return 0; |
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} |
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static const struct snd_soc_component_driver rt5514_spi_component = { |
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.name = DRV_NAME, |
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.probe = rt5514_spi_pcm_probe, |
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.open = rt5514_spi_pcm_open, |
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.hw_params = rt5514_spi_hw_params, |
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.hw_free = rt5514_spi_hw_free, |
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.pointer = rt5514_spi_pcm_pointer, |
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.pcm_construct = rt5514_spi_pcm_new, |
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.legacy_dai_naming = 1, |
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}; |
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/** |
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* rt5514_spi_burst_read - Read data from SPI by rt5514 address. |
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* @addr: Start address. |
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* @rxbuf: Data Buffer for reading. |
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* @len: Data length, it must be a multiple of 8. |
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* |
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* |
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* Returns true for success. |
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*/ |
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int rt5514_spi_burst_read(unsigned int addr, u8 *rxbuf, size_t len) |
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{ |
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u8 spi_cmd = RT5514_SPI_CMD_BURST_READ; |
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int status; |
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u8 write_buf[8]; |
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unsigned int i, end, offset = 0; |
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struct spi_message message; |
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struct spi_transfer x[3]; |
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while (offset < len) { |
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if (offset + RT5514_SPI_BUF_LEN <= len) |
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end = RT5514_SPI_BUF_LEN; |
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else |
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end = len % RT5514_SPI_BUF_LEN; |
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write_buf[0] = spi_cmd; |
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write_buf[1] = ((addr + offset) & 0xff000000) >> 24; |
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write_buf[2] = ((addr + offset) & 0x00ff0000) >> 16; |
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write_buf[3] = ((addr + offset) & 0x0000ff00) >> 8; |
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write_buf[4] = ((addr + offset) & 0x000000ff) >> 0; |
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spi_message_init(&message); |
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memset(x, 0, sizeof(x)); |
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x[0].len = 5; |
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x[0].tx_buf = write_buf; |
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spi_message_add_tail(&x[0], &message); |
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x[1].len = 4; |
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x[1].tx_buf = write_buf; |
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spi_message_add_tail(&x[1], &message); |
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x[2].len = end; |
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x[2].rx_buf = rxbuf + offset; |
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spi_message_add_tail(&x[2], &message); |
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status = spi_sync(rt5514_spi, &message); |
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if (status) |
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return false; |
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offset += RT5514_SPI_BUF_LEN; |
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} |
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for (i = 0; i < len; i += 8) { |
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write_buf[0] = rxbuf[i + 0]; |
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write_buf[1] = rxbuf[i + 1]; |
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write_buf[2] = rxbuf[i + 2]; |
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write_buf[3] = rxbuf[i + 3]; |
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write_buf[4] = rxbuf[i + 4]; |
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write_buf[5] = rxbuf[i + 5]; |
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write_buf[6] = rxbuf[i + 6]; |
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write_buf[7] = rxbuf[i + 7]; |
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rxbuf[i + 0] = write_buf[7]; |
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rxbuf[i + 1] = write_buf[6]; |
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rxbuf[i + 2] = write_buf[5]; |
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rxbuf[i + 3] = write_buf[4]; |
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rxbuf[i + 4] = write_buf[3]; |
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rxbuf[i + 5] = write_buf[2]; |
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rxbuf[i + 6] = write_buf[1]; |
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rxbuf[i + 7] = write_buf[0]; |
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} |
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return true; |
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} |
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EXPORT_SYMBOL_GPL(rt5514_spi_burst_read); |
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/** |
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* rt5514_spi_burst_write - Write data to SPI by rt5514 address. |
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* @addr: Start address. |
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* @txbuf: Data Buffer for writng. |
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* @len: Data length, it must be a multiple of 8. |
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* |
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* |
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* Returns true for success. |
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*/ |
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int rt5514_spi_burst_write(u32 addr, const u8 *txbuf, size_t len) |
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{ |
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u8 spi_cmd = RT5514_SPI_CMD_BURST_WRITE; |
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u8 *write_buf; |
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unsigned int i, end, offset = 0; |
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write_buf = kmalloc(RT5514_SPI_BUF_LEN + 6, GFP_KERNEL); |
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if (write_buf == NULL) |
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return -ENOMEM; |
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while (offset < len) { |
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if (offset + RT5514_SPI_BUF_LEN <= len) |
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end = RT5514_SPI_BUF_LEN; |
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else |
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end = len % RT5514_SPI_BUF_LEN; |
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write_buf[0] = spi_cmd; |
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write_buf[1] = ((addr + offset) & 0xff000000) >> 24; |
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write_buf[2] = ((addr + offset) & 0x00ff0000) >> 16; |
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write_buf[3] = ((addr + offset) & 0x0000ff00) >> 8; |
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write_buf[4] = ((addr + offset) & 0x000000ff) >> 0; |
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for (i = 0; i < end; i += 8) { |
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write_buf[i + 12] = txbuf[offset + i + 0]; |
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write_buf[i + 11] = txbuf[offset + i + 1]; |
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write_buf[i + 10] = txbuf[offset + i + 2]; |
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write_buf[i + 9] = txbuf[offset + i + 3]; |
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write_buf[i + 8] = txbuf[offset + i + 4]; |
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write_buf[i + 7] = txbuf[offset + i + 5]; |
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write_buf[i + 6] = txbuf[offset + i + 6]; |
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write_buf[i + 5] = txbuf[offset + i + 7]; |
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} |
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write_buf[end + 5] = spi_cmd; |
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spi_write(rt5514_spi, write_buf, end + 6); |
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offset += RT5514_SPI_BUF_LEN; |
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} |
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kfree(write_buf); |
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return 0; |
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} |
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EXPORT_SYMBOL_GPL(rt5514_spi_burst_write); |
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static int rt5514_spi_probe(struct spi_device *spi) |
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{ |
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int ret; |
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rt5514_spi = spi; |
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ret = devm_snd_soc_register_component(&spi->dev, |
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&rt5514_spi_component, |
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&rt5514_spi_dai, 1); |
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if (ret < 0) { |
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dev_err(&spi->dev, "Failed to register component.\n"); |
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return ret; |
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} |
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return 0; |
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} |
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static int __maybe_unused rt5514_suspend(struct device *dev) |
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{ |
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int irq = to_spi_device(dev)->irq; |
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if (device_may_wakeup(dev)) |
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enable_irq_wake(irq); |
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return 0; |
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} |
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static int __maybe_unused rt5514_resume(struct device *dev) |
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{ |
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struct rt5514_dsp *rt5514_dsp = dev_get_drvdata(dev); |
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int irq = to_spi_device(dev)->irq; |
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u8 buf[8]; |
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if (device_may_wakeup(dev)) |
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disable_irq_wake(irq); |
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if (rt5514_dsp) { |
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if (rt5514_dsp->substream) { |
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rt5514_spi_burst_read(RT5514_IRQ_CTRL, (u8 *)&buf, |
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sizeof(buf)); |
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if (buf[0] & RT5514_IRQ_STATUS_BIT) |
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rt5514_schedule_copy(rt5514_dsp); |
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} |
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} |
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return 0; |
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} |
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static const struct dev_pm_ops rt5514_pm_ops = { |
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SET_SYSTEM_SLEEP_PM_OPS(rt5514_suspend, rt5514_resume) |
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}; |
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static const struct of_device_id rt5514_of_match[] = { |
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{ .compatible = "realtek,rt5514", }, |
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{}, |
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}; |
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MODULE_DEVICE_TABLE(of, rt5514_of_match); |
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static struct spi_driver rt5514_spi_driver = { |
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.driver = { |
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.name = "rt5514", |
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.pm = &rt5514_pm_ops, |
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.of_match_table = of_match_ptr(rt5514_of_match), |
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}, |
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.probe = rt5514_spi_probe, |
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}; |
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module_spi_driver(rt5514_spi_driver); |
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MODULE_DESCRIPTION("RT5514 SPI driver"); |
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MODULE_AUTHOR("Oder Chiou <[email protected]>"); |
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MODULE_LICENSE("GPL v2");
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