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![Linus Walleij](/assets/img/avatar_default.png)
This driver include the GPIO legacy header <linux/gpio.h yet doesn't use symbols from it. Drop the include. Signed-off-by: Linus Walleij <linus.walleij@linaro.org Link: https://lore.kernel.org/r/20230812-descriptors-asoc-v1-8-eb4dca1f68af@linaro.org Signed-off-by: Mark Brown <broonie@kernel.org
514 lines
13 KiB
C
514 lines
13 KiB
C
// 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 <oder_chiou@realtek.com>
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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/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))
|
|
enable_irq_wake(irq);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int __maybe_unused rt5514_resume(struct device *dev)
|
|
{
|
|
struct rt5514_dsp *rt5514_dsp = dev_get_drvdata(dev);
|
|
int irq = to_spi_device(dev)->irq;
|
|
u8 buf[8];
|
|
|
|
if (device_may_wakeup(dev))
|
|
disable_irq_wake(irq);
|
|
|
|
if (rt5514_dsp) {
|
|
if (rt5514_dsp->substream) {
|
|
rt5514_spi_burst_read(RT5514_IRQ_CTRL, (u8 *)&buf,
|
|
sizeof(buf));
|
|
if (buf[0] & RT5514_IRQ_STATUS_BIT)
|
|
rt5514_schedule_copy(rt5514_dsp);
|
|
}
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static const struct dev_pm_ops rt5514_pm_ops = {
|
|
SET_SYSTEM_SLEEP_PM_OPS(rt5514_suspend, rt5514_resume)
|
|
};
|
|
|
|
static const struct of_device_id rt5514_of_match[] = {
|
|
{ .compatible = "realtek,rt5514", },
|
|
{},
|
|
};
|
|
MODULE_DEVICE_TABLE(of, rt5514_of_match);
|
|
|
|
static struct spi_driver rt5514_spi_driver = {
|
|
.driver = {
|
|
.name = "rt5514",
|
|
.pm = &rt5514_pm_ops,
|
|
.of_match_table = of_match_ptr(rt5514_of_match),
|
|
},
|
|
.probe = rt5514_spi_probe,
|
|
};
|
|
module_spi_driver(rt5514_spi_driver);
|
|
|
|
MODULE_DESCRIPTION("RT5514 SPI driver");
|
|
MODULE_AUTHOR("Oder Chiou <oder_chiou@realtek.com>");
|
|
MODULE_LICENSE("GPL v2");
|