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nuttx/drivers/audio/wm8904.c

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/****************************************************************************
* drivers/audio/wm8904.c
*
* Audio device driver for Wolfson Microelectronics WM8904 Audio codec.
*
* Copyright (C) 2014, 2016 Gregory Nutt. All rights reserved.
* Author: Gregory Nutt <gnutt@nuttx.org>
*
* References:
* - "WM8904 Ultra Low Power CODEC for Portable Audio Applications, Pre-
* Production", September 2012, Rev 3.3, Wolfson Microelectronics
*
* - The framework for this driver is based on Ken Pettit's VS1053 driver.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in
* the documentation and/or other materials provided with the
* distribution.
* 3. Neither the name NuttX nor the names of its contributors may be
* used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*
****************************************************************************/
/****************************************************************************
* Included Files
****************************************************************************/
#include <nuttx/config.h>
#include <sys/types.h>
#include <sys/ioctl.h>
#include <stdint.h>
#include <stdio.h>
#include <fcntl.h>
#include <string.h>
#include <errno.h>
#include <fixedmath.h>
#include <queue.h>
#include <debug.h>
#include <nuttx/irq.h>
#include <nuttx/kmalloc.h>
#include <nuttx/clock.h>
#include <nuttx/wqueue.h>
#include <nuttx/i2c/i2c_master.h>
#include <nuttx/fs/fs.h>
#include <nuttx/fs/ioctl.h>
#include <nuttx/audio/i2s.h>
#include <nuttx/audio/audio.h>
#include <nuttx/audio/wm8904.h>
#include <nuttx/lib/math.h>
#include "wm8904.h"
/****************************************************************************
* Private Function Prototypes
****************************************************************************/
#if !defined(CONFIG_WM8904_REGDUMP) && !defined(CONFIG_WM8904_CLKDEBUG)
static
#endif
uint16_t wm8904_readreg(FAR struct wm8904_dev_s *priv,
uint8_t regaddr);
static void wm8904_writereg(FAR struct wm8904_dev_s *priv,
uint8_t regaddr, uint16_t regval);
static void wm8904_takesem(sem_t *sem);
#define wm8904_givesem(s) sem_post(s)
#ifndef CONFIG_AUDIO_EXCLUDE_VOLUME
static inline uint16_t wm8904_scalevolume(uint16_t volume, b16_t scale);
static void wm8904_setvolume(FAR struct wm8904_dev_s *priv,
uint16_t volume, bool mute);
#endif
#ifndef CONFIG_AUDIO_EXCLUDE_TONE
static void wm8904_setbass(FAR struct wm8904_dev_s *priv, uint8_t bass);
static void wm8904_settreble(FAR struct wm8904_dev_s *priv, uint8_t treble);
#endif
static void wm8904_setdatawidth(FAR struct wm8904_dev_s *priv);
static void wm8904_setbitrate(FAR struct wm8904_dev_s *priv);
/* Audio lower half methods (and close friends) */
static int wm8904_getcaps(FAR struct audio_lowerhalf_s *dev, int type,
FAR struct audio_caps_s *caps);
#ifdef CONFIG_AUDIO_MULTI_SESSION
static int wm8904_configure(FAR struct audio_lowerhalf_s *dev,
FAR void *session, FAR const struct audio_caps_s *caps);
#else
static int wm8904_configure(FAR struct audio_lowerhalf_s *dev,
FAR const struct audio_caps_s *caps);
#endif
static int wm8904_shutdown(FAR struct audio_lowerhalf_s *dev);
static void wm8904_senddone(FAR struct i2s_dev_s *i2s,
FAR struct ap_buffer_s *apb, FAR void *arg, int result);
static void wm8904_returnbuffers(FAR struct wm8904_dev_s *priv);
static int wm8904_sendbuffer(FAR struct wm8904_dev_s *priv);
#ifdef CONFIG_AUDIO_MULTI_SESSION
static int wm8904_start(FAR struct audio_lowerhalf_s *dev,
FAR void *session);
#else
static int wm8904_start(FAR struct audio_lowerhalf_s *dev);
#endif
#ifndef CONFIG_AUDIO_EXCLUDE_STOP
#ifdef CONFIG_AUDIO_MULTI_SESSION
static int wm8904_stop(FAR struct audio_lowerhalf_s *dev,
FAR void *session);
#else
static int wm8904_stop(FAR struct audio_lowerhalf_s *dev);
#endif
#endif
#ifndef CONFIG_AUDIO_EXCLUDE_PAUSE_RESUME
#ifdef CONFIG_AUDIO_MULTI_SESSION
static int wm8904_pause(FAR struct audio_lowerhalf_s *dev,
FAR void *session);
static int wm8904_resume(FAR struct audio_lowerhalf_s *dev,
FAR void *session);
#else
static int wm8904_pause(FAR struct audio_lowerhalf_s *dev);
static int wm8904_resume(FAR struct audio_lowerhalf_s *dev);
#endif
#endif
static int wm8904_enqueuebuffer(FAR struct audio_lowerhalf_s *dev,
FAR struct ap_buffer_s *apb);
static int wm8904_cancelbuffer(FAR struct audio_lowerhalf_s *dev,
FAR struct ap_buffer_s *apb);
static int wm8904_ioctl(FAR struct audio_lowerhalf_s *dev, int cmd,
unsigned long arg);
#ifdef CONFIG_AUDIO_MULTI_SESSION
static int wm8904_reserve(FAR struct audio_lowerhalf_s *dev,
FAR void **session);
#else
static int wm8904_reserve(FAR struct audio_lowerhalf_s *dev);
#endif
#ifdef CONFIG_AUDIO_MULTI_SESSION
static int wm8904_release(FAR struct audio_lowerhalf_s *dev,
FAR void *session);
#else
static int wm8904_release(FAR struct audio_lowerhalf_s *dev);
#endif
/* Interrupt handling an worker thread */
#ifdef WM8904_USE_FFLOCK_INT
static void wm8904_interrupt_work(FAR void *arg);
static int wm8904_interrupt(FAR const struct wm8904_lower_s *lower,
FAR void *arg);
#endif
static void *wm8904_workerthread(pthread_addr_t pvarg);
/* Initialization */
static void wm8904_audio_output(FAR struct wm8904_dev_s *priv);
#if 0 /* Not used */
static void wm8904_audio_input(FAR struct wm8904_dev_s *priv);
#endif
#ifdef WM8904_USE_FFLOCK_INT
static void wm8904_configure_ints(FAR struct wm8904_dev_s *priv);
#else
# define wm8904_configure_ints(p)
#endif
static void wm8904_hw_reset(FAR struct wm8904_dev_s *priv);
/****************************************************************************
* Private Data
****************************************************************************/
static const struct audio_ops_s g_audioops =
{
wm8904_getcaps, /* getcaps */
wm8904_configure, /* configure */
wm8904_shutdown, /* shutdown */
wm8904_start, /* start */
#ifndef CONFIG_AUDIO_EXCLUDE_STOP
wm8904_stop, /* stop */
#endif
#ifndef CONFIG_AUDIO_EXCLUDE_PAUSE_RESUME
wm8904_pause, /* pause */
wm8904_resume, /* resume */
#endif
NULL, /* allocbuffer */
NULL, /* freebuffer */
wm8904_enqueuebuffer, /* enqueue_buffer */
wm8904_cancelbuffer, /* cancel_buffer */
wm8904_ioctl, /* ioctl */
NULL, /* read */
NULL, /* write */
wm8904_reserve, /* reserve */
wm8904_release /* release */
};
#ifndef CONFIG_WM8904_CLKDEBUG
static
#endif
const uint8_t g_sysclk_scaleb1[WM8904_BCLK_MAXDIV+1] =
{
2, 3, 4, 6, 8, 10, 11, /* 1, 1.5, 2, 3, 4, 5, 5.5 */
12, 16, 20, 22, 24, 32, 40, /* 6, 8, 10, 11, 12, 16, 20 */
44, 48, 50, 60, 64, 88, 96 /* 22, 24, 25, 30, 32, 44, 48 */
};
#ifndef CONFIG_WM8904_CLKDEBUG
static
#endif
const uint8_t g_fllratio[WM8904_NFLLRATIO] =
{
1, 2, 4, 8, 16
};
/****************************************************************************
* Private Functions
****************************************************************************/
/****************************************************************************
* Name: wm8904_readreg
*
* Description
* Read the specified 16-bit register from the WM8904 device.
*
****************************************************************************/
#if !defined(CONFIG_WM8904_REGDUMP) && !defined(CONFIG_WM8904_CLKDEBUG)
static
#endif
uint16_t wm8904_readreg(FAR struct wm8904_dev_s *priv, uint8_t regaddr)
{
int retries;
/* Try up to three times to read the register */
for (retries = 1; retries <= 3; retries++)
{
struct i2c_msg_s msg[2];
uint8_t data[2];
int ret;
/* Set up to write the address */
msg[0].frequency = priv->lower->frequency;
msg[0].addr = priv->lower->address;
msg[0].flags = 0;
msg[0].buffer = &regaddr;
msg[0].length = 1;
/* Followed by the read data */
msg[1].frequency = priv->lower->frequency;
msg[1].addr = priv->lower->address;
msg[1].flags = I2C_M_READ;
msg[1].buffer = data;
msg[1].length = 2;
/* Read the register data. The returned value is the number messages
* completed.
*/
ret = I2C_TRANSFER(priv->i2c, msg, 2);
if (ret < 0)
{
#ifdef CONFIG_I2C_RESET
/* Perhaps the I2C bus is locked up? Try to shake the bus free */
audwarn("WARNING: I2C_TRANSFER failed: %d ... Resetting\n", ret);
ret = I2C_RESET(priv->i2c);
if (ret < 0)
{
auderr("ERROR: I2C_RESET failed: %d\n", ret);
break;
}
#else
auderr("ERROR: I2C_TRANSFER failed: %d\n", ret);
#endif
}
else
{
uint16_t regval;
/* The I2C transfer was successful... break out of the loop and
* return the value read.
*/
regval = ((uint16_t)data[0] << 8) | (uint16_t)data[1];
audinfo("Read: %02x -> %04x\n", regaddr, regval);
return regval;
}
audinfo("retries=%d regaddr=%02x\n", retries, regaddr);
}
/* No error indication is returned on a failure... just return zero */
return 0;
}
/************************************************************************************
* Name: wm8904_writereg
*
* Description:
* Write the specified 16-bit register to the WM8904 device.
*
************************************************************************************/
static void wm8904_writereg(FAR struct wm8904_dev_s *priv, uint8_t regaddr,
uint16_t regval)
{
struct i2c_config_s config;
int retries;
/* Setup up the I2C configuration */
config.frequency = priv->lower->frequency;
config.address = priv->lower->address;
config.addrlen = 7;
/* Try up to three times to read the register */
for (retries = 1; retries <= 3; retries++)
{
uint8_t data[3];
int ret;
/* Set up the data to write */
data[0] = regaddr;
data[1] = regval >> 8;
data[2] = regval & 0xff;
/* Read the register data. The returned value is the number messages
* completed.
*/
ret = i2c_write(priv->i2c, &config, data, 3);
if (ret < 0)
{
#ifdef CONFIG_I2C_RESET
/* Perhaps the I2C bus is locked up? Try to shake the bus free */
audwarn("WARNING: i2c_write failed: %d ... Resetting\n", ret);
ret = I2C_RESET(priv->i2c);
if (ret < 0)
{
auderr("ERROR: I2C_RESET failed: %d\n", ret);
break;
}
#else
auderr("ERROR: I2C_TRANSFER failed: %d\n", ret);
#endif
}
else
{
/* The I2C transfer was successful... break out of the loop and
* return the value read.
*/
audinfo("Write: %02x <- %04x\n", regaddr, regval);
return;
}
audinfo("retries=%d regaddr=%02x\n", retries, regaddr);
}
}
/************************************************************************************
* Name: wm8904_takesem
*
* Description:
* Take a semaphore count, handling the nasty EINTR return if we are interrupted
* by a signal.
*
************************************************************************************/
static void wm8904_takesem(sem_t *sem)
{
int ret;
do
{
ret = sem_wait(sem);
DEBUGASSERT(ret == 0 || errno == EINTR);
}
while (ret < 0);
}
/************************************************************************************
* Name: wm8904_scalevolume
*
* Description:
* Set the right and left volume values in the WM8904 device based on the current
* volume and balance settings.
*
************************************************************************************/
#ifndef CONFIG_AUDIO_EXCLUDE_VOLUME
static inline uint16_t wm8904_scalevolume(uint16_t volume, b16_t scale)
{
return b16toi((b16_t)volume * scale);
}
#endif
/************************************************************************************
* Name: wm8904_setvolume
*
* Description:
* Set the right and left volume values in the WM8904 device based on the current
* volume and balance settings.
*
************************************************************************************/
#ifndef CONFIG_AUDIO_EXCLUDE_VOLUME
static void wm8904_setvolume(FAR struct wm8904_dev_s *priv, uint16_t volume,
bool mute)
{
uint32_t leftlevel;
uint32_t rightlevel;
uint16_t regval;
audinfo("volume=%u mute=%u\n", volume, mute);
#ifndef CONFIG_AUDIO_EXCLUDE_BALANCE
/* Calculate the left channel volume level {0..1000} */
if (priv->balance <= 500)
{
leftlevel = volume;
}
else if (priv->balance == 1000)
{
leftlevel = 0;
}
else
{
leftlevel = wm8904_scalevolume(volume, b16ONE - (b16_t)priv->balance);
}
/* Calculate the right channel volume level {0..1000} */
if (priv->balance >= 500)
{
rightlevel = volume;
}
else if (priv->balance == 0)
{
rightlevel = 0;
}
else
{
rightlevel = wm8904_scalevolume(volume, (b16_t)priv->balance);
}
#else
leftlevel = priv->volume;
rightlevel = priv->volume;
#endif
/* Set the volume */
regval = WM8904_HPOUTZC | WM8904_HPOUT_VOL(leftlevel);
if (mute)
{
regval |= WM8904_HPOUT_MUTE;
}
wm8904_writereg(priv, WM8904_ANA_LEFT_OUT1, regval);
regval = WM8904_HPOUTZC | WM8904_HPOUT_VOL(rightlevel);
if (mute)
{
regval |= WM8904_HPOUT_MUTE;
}
wm8904_writereg(priv, WM8904_ANA_RIGHT_OUT1, regval);
/* Remember the volume level and mute settings */
priv->volume = volume;
priv->mute = mute;
}
#endif /* CONFIG_AUDIO_EXCLUDE_VOLUME */
/************************************************************************************
* Name: wm8904_setbass
*
* Description:
* Set the bass level.
*
* The level and range are in whole percentage levels (0-100).
*
************************************************************************************/
#ifndef CONFIG_AUDIO_EXCLUDE_TONE
static void wm8904_setbass(FAR struct wm8904_dev_s *priv, uint8_t bass)
{
audinfo("bass=%u\n", bass);
#warning Missing logic
}
#endif /* CONFIG_AUDIO_EXCLUDE_TONE */
/************************************************************************************
* Name: wm8904_settreble
*
* Description:
* Set the treble level .
*
* The level and range are in whole percentage levels (0-100).
*
************************************************************************************/
#ifndef CONFIG_AUDIO_EXCLUDE_TONE
static void wm8904_settreble(FAR struct wm8904_dev_s *priv, uint8_t treble)
{
audinfo("treble=%u\n", treble);
#warning Missing logic
}
#endif /* CONFIG_AUDIO_EXCLUDE_TONE */
/****************************************************************************
* Name: wm8904_setdatawidth
*
* Description:
* Set the 8- or 16-bit data modes
*
****************************************************************************/
static void wm8904_setdatawidth(FAR struct wm8904_dev_s *priv)
{
uint16_t regval;
/* "8-bit mode is selected whenever DAC_COMP=1 or ADC_COMP=1. The use of
* 8-bit data allows samples to be passed using as few as 8 BCLK cycles
* per LRCLK frame. When using DSP mode B, 8-bit data words may be
* transferred consecutively every 8 BCLK cycles.
*
* "8-bit mode (without Companding) may be enabled by setting
* DAC_COMPMODE=1 or ADC_COMPMODE=1, when DAC_COMP=0 and ADC_COMP=0.
*/
if (priv->bpsamp == 16)
{
/* Reset default default setting */
regval = (WM8904_AIFADCR_SRC | WM8904_AIFDACR_SRC);
wm8904_writereg(priv, WM8904_AIF0, regval);
}
else
{
/* This should select 8-bit with no companding */
regval = (WM8904_AIFADCR_SRC | WM8904_AIFDACR_SRC |
WM8904_ADC_COMPMODE | WM8904_DAC_COMPMODE);
wm8904_writereg(priv, WM8904_AIF0, regval);
}
}
/****************************************************************************
* Name: wm8904_setbitrate
*
* Description:
* Program the FLL to achieve the requested bitrate (fout). Given:
*
* samprate - Samples per second
* nchannels - Number of channels of data
* bpsamp - Bits per sample
*
* Then
* fout = samprate * nchannels * bpsamp
*
* For example:
* samplerate = 11,025 samples/sec
* nchannels = 1
* bpsamp = 16 bits
*
* Then
* fout = 11025 samples/sec * 1 * 16 bits/sample = 176.4 bits/sec
*
* The clocking is configured like this:
* MCLK is the FLL source clock
* Fref is the scaled down version of MCLK
* Fvco is the output frequency from the FLL
* Fout is the final output from the FLL that drives the SYSCLK
* SYSCLK can be divided down to generate the BCLK
*
* The FLL output frequency is generated at that fout by:
*
* Fout = (Fvco / FLL_OUTDIV)
*
* The FLL operating frequency is set according to:
*
* Fvco = Fref * N.K * FLL_RATIO
*
* Where Fref is the input frequency frequency as determined by
* FLL_CLK_REF_DIV. Fvco must be in the range of 90-100MHz.
*
* As an example:
* FLL_CLK_REF_DIV = 16
* FLL_OUTDIV = 8
* N.K = 187.25
* FLL_RATIO=16
* Fref =32,768
*
* Fvco = 32,768 * 187.25 / 16 = 383,488 Hz
* Fout = 383,488 / 8 = 47,936 Hz (approx. 48Khz)
*
****************************************************************************/
static void wm8904_setbitrate(FAR struct wm8904_dev_s *priv)
{
uint64_t tmp64;
uint32_t fref;
uint32_t fvco;
uint32_t fout;
uint32_t minfout;
uint16_t regval;
b16_t nk;
unsigned int fllndx;
unsigned int divndx;
unsigned int outdiv;
unsigned int framelen;
#ifdef WM8904_USE_FFLOCK_INT
bool enabled;
int retries;
#endif
DEBUGASSERT(priv && priv->lower);
/* First calculate the desired bitrate (fout). This is based on
*
* 1. The I2S frame length (in bits)
* 2. The number of frames per second = nchannnels * samplerate
*/
framelen = (priv->bpsamp == 8) ? WM8904_FRAMELEN8 : WM8904_FRAMELEN16;
fout = (uint32_t)priv->samprate * (uint32_t)priv->nchannels * framelen;
regval = WM8904_LRCLK_DIR | WM8904_LRCLK_RATE(framelen << 1);
wm8904_writereg(priv, WM8904_AIF3, regval);
audinfo("sample rate=%u nchannels=%u bpsamp=%u framelen=%d fout=%lu\n",
priv->samprate, priv->nchannels, priv->bpsamp, framelen,
(unsigned long)fout);
/* Disable the SYSCLK.
*
* "The SYSCLK signal is enabled by register bit CLK_SYS_ENA. This bit
* should be set to 0 when reconfiguring clock sources. ... "
*
* REVISIT: This does not appear necessary if we are just reconfiguring
* the FLL. Disabling the FLL will stop the SYSCLK input just fine.
*/
regval = WM8904_SYSCLK_SRCFLL | WM8904_CLK_DSP_ENA;
wm8904_writereg(priv, WM8904_CLKRATE2, regval);
#if 0 /* Unnecessary */
/* Unlock forced oscillator control and switch it off */
wm8904_writereg(priv, WM8904_CTRLIF_TEST_1, WM8904_USER_KEY);
wm8904_writereg(priv, WM8904_FLL_NCO_TEST1, 0);
wm8904_writereg(priv, WM8904_CTRLIF_TEST_1, 0);
#endif
/* "The FLL is enabled using the FLL_ENA register bit. Note that, when
* changing FLL settings, it is recommended that the digital circuit be
* disabled via FLL_ENA and then re-enabled after the other register
* settings have been updated."
*/
wm8904_writereg(priv, WM8904_FLL_CTRL1, 0);
/* Determine Fref. The source refrence clock should be the MCLK */
fref = priv->lower->mclk;
regval = (WM8904_FLL_CLK_REF_SRC_MCLK | WM8904_FLL_CLK_REF_DIV1);
/* MCLK must be divided down so that fref <=13.5MHz */
if (fref > 4*13500000)
{
fref >>= 3;
regval = (WM8904_FLL_CLK_REF_SRC_MCLK | WM8904_FLL_CLK_REF_DIV8);
}
else if (fref > 2*13500000)
{
fref >>= 2;
regval = (WM8904_FLL_CLK_REF_SRC_MCLK | WM8904_FLL_CLK_REF_DIV4);
}
else if (fref > 13500000)
{
fref >>= 1;
regval = (WM8904_FLL_CLK_REF_SRC_MCLK | WM8904_FLL_CLK_REF_DIV2);
}
wm8904_writereg(priv, WM8904_FLL_CTRL5, regval);
/* Fvco must be between 90 and 100Mhz. In order to meet this
* requirement, the value of FLL_OUTDIV should be selected according
* to the desired output Fout. The divider, FLL_OUTDIV, must be set
* so that Fvco is in the range 90-100MHz. The available divisions
* are integers from 4 to 64.
*
* Fout = Fvco /FLL_OUTDIV
*
*
* Is this Fout realizable? This often happens for very low frequencies.
* If so, we can select a different final SYSCLK scaling frequency.
*/
minfout = WM8904_FVCO_MAX / WM8904_MAXOUTDIV;
divndx = 0;
for (; ; )
{
/* Calculate the new value of Fout that we would need to provide
* with this SYSCLK divider in place.
*/
uint32_t newfout = (g_sysclk_scaleb1[divndx] * fout) >> 1;
/* Is this increased Fout realizable? Or are we just just out of
* dividers?
*/
if (newfout >= minfout || divndx == WM8904_BCLK_MAXDIV)
{
/* In either case, this is the Fout and divider that we will be
* using.
*/
fout = newfout;
break;
}
/* We have more.. Try the next divider */
divndx++;
}
/* When we get here, divndx holds the register value for the new SYSCLK
* divider. Set the divider value in the Audio Interface 2 register.
*/
regval = WM8904_OPCLK_DIV1 | WM8904_BCLK_DIV(divndx);
wm8904_writereg(priv, WM8904_AIF2, regval);
/* Now lets make our best guess for FLL_OUTDIV
*
* FLL_OUTDIV = 95000000 / Fout
*/
outdiv = ((WM8904_FVCO_MAX + WM8904_FVCO_MAX) >> 1) / fout;
if (outdiv < 4)
{
outdiv = 4;
}
else if (outdiv > 64)
{
outdiv = 64;
}
/* The WM8904 suggests the selecting FLL_RATIO via the following
* range checks:
*/
if (fref >= 1000000)
{
fllndx = WM8904_NFLLRATIO_DIV1;
}
else if (fref > 256000)
{
fllndx = WM8904_NFLLRATIO_DIV2;
}
else if (fref > 128000)
{
fllndx = WM8904_NFLLRATIO_DIV4;
}
else if (fref > 64000)
{
fllndx = WM8904_NFLLRATIO_DIV8;
}
else
{
fllndx = WM8904_NFLLRATIO_DIV16;
}
/* Finally, we need to determine the value of N.K
*
* Fvco = (Fout * FLL_OUTDIV)
* N.K = Fvco / (FLL_FRATIO * FREF)
*/
fvco = fout * outdiv;
tmp64 = ((uint64_t)fvco << 16) / (g_fllratio[fllndx] * fref);
nk = (b16_t)tmp64;
audinfo("mclk=%lu fref=%lu fvco=%lu fout=%lu divndx=%u\n",
(unsigned long)priv->lower->mclk, (unsigned long)fref,
(unsigned long)fvco, (unsigned long)fout, divndx);
audinfo("N.K=%08lx outdiv=%u fllratio=%u\n",
(unsigned long)nk, outdiv, g_fllratio[fllndx]);
/* Save the actual bit rate that we are using. This will be used by the
* LRCLCK calculations.
*/
priv->bitrate = fout;
/* Now, Configure the FLL */
/* FLL Control 1
*
* FLL_FRACN_ENA=1 : Enables fractional mode
* FLL_OSC_EN=0 : FLL internal oscillator disabled
* FLL_ENA=0 : The FLL is not enabled
*
* FLL_OSC_ENA must be enabled before enabling FLL_ENA (FLL_OSC_ENA is
* only required for free-running modes).
*/
wm8904_writereg(priv, WM8904_FLL_CTRL1, 0);
wm8904_writereg(priv, WM8904_FLL_CTRL1, WM8904_FLL_FRACN_ENA);
/* FLL Control 2
*
* FLL_OUTDIV : FLL Fout clock divider
* : Fout = Fvco / FLL_OUTDIV
* : Calculated above
* FLL_CTRL_RATE=1 : Frequency of the FLL control block,
* : = Fvco / FLL_CTRL_RATE
* FLL_FRATIO : Fvco clock divider
* : Determined by MCLK tests above
*/
regval = WM8904_FLL_OUTDIV(outdiv) | WM8904_FLL_CTRL_RATE(1) |
WM8904_FLL_FRATIO(fllndx);
wm8904_writereg(priv, WM8904_FLL_CTRL2, regval);
/* FLL Control 3
*
* Fractional multiply for Fref
*/
wm8904_writereg(priv, WM8904_FLL_CTRL3, b16frac(nk));
/* FLL Control 4
*
* FLL_N : Integer multiply for Fref
* FLL_GAIN : Gain applied to error
*/
regval = WM8904_FLL_N(b16toi(nk)) | WM8904_FLL_GAIN_X1;
wm8904_writereg(priv, WM8904_FLL_CTRL4, regval);
/* FLL Control 5
*
* FLL_CLK_REF_DIV : FLL Clock Reference Divider
*
* Already set above
*/
/* Enable the FLL */
regval = WM8904_FLL_FRACN_ENA | WM8904_FLL_ENA;
wm8904_writereg(priv, WM8904_FLL_CTRL1, regval);
#if defined(WM8904_USE_FFLOCK_INT)
/* Make sure that interrupts are enabled */
enabled = WM8904_ENABLE(priv->lower);
/* Enable the FLL lock interrupt. Here we can be sloppy since the FLL
* lock is the only interrupt every enabled.
*/
priv->locked = false;
regval = WM8904_ALL_INTS & ~WM8904_FLL_LOCK_INT;
wm8904_writereg(priv, WM8904_INT_MASK, regval);
/* Allow time for FLL lock. Typical is 2 MSec. No exotic interlock
* here; we just poll a flag set by the interrupt handler.
* REVISIT: Probably not necessary.
*/
retries = 5;
do
{
usleep(5*5000);
}
while (priv->locked == false && --retries > 0);
/* Make sure that the FLL lock interrupt is disabled and clear any pending
* interrupt status (again cutting* some corners). NOTE: The interrupt
* handler will do these things if there is no timeout.
*/
WM8904_DISABLE(priv->lower);
wm8904_writereg(priv, WM8904_INT_MASK, WM8904_ALL_INTS);
wm8904_writereg(priv, WM8904_INT_STATUS, WM8904_ALL_INTS);
/* Restore the interrupt state. */
WM8904_RESTORE(priv->lower, enabled)
#elif defined(WM8904_USE_FFLOCK_POLL)
/* Allow time for FLL lock. Typical is 2 MSec. */
retries = 5;
do
{
usleep(5*5000);
}
while ((wm8904_readreg(priv, WM8904_INT_STATUS) & WM8904_FLL_LOCK_INT) != 0 ||
--retries > 0);
/* Clear all pending status bits by writing 1's into the interrupt status
* register.
*/
wm8904_writereg(priv, WM8904_INT_STATUS, WM8904_ALL_INTS);
#endif /* !WM8904_USE_FFLOCK_INT && !WM8904_USE_FFLOCK_POLL */
/* Re-enable the SYSCLK. */
regval = WM8904_SYSCLK_SRCFLL | WM8904_CLK_SYS_ENA | WM8904_CLK_DSP_ENA;
wm8904_writereg(priv, WM8904_CLKRATE2, regval);
}
/****************************************************************************
* Name: wm8904_getcaps
*
* Description:
* Get the audio device capabilities
*
****************************************************************************/
static int wm8904_getcaps(FAR struct audio_lowerhalf_s *dev, int type,
FAR struct audio_caps_s *caps)
{
/* Validate the structure */
DEBUGASSERT(caps && caps->ac_len >= sizeof(struct audio_caps_s));
audinfo("type=%d ac_type=%d\n", type, caps->ac_type);
/* Fill in the caller's structure based on requested info */
caps->ac_format.hw = 0;
caps->ac_controls.w = 0;
switch (caps->ac_type)
{
/* Caller is querying for the types of units we support */
case AUDIO_TYPE_QUERY:
/* Provide our overall capabilities. The interfacing software
* must then call us back for specific info for each capability.
*/
caps->ac_channels = 2; /* Stereo output */
switch (caps->ac_subtype)
{
case AUDIO_TYPE_QUERY:
/* We don't decode any formats! Only something above us in
* the audio stream can perform decoding on our behalf.
*/
/* The types of audio units we implement */
caps->ac_controls.b[0] = AUDIO_TYPE_OUTPUT | AUDIO_TYPE_FEATURE |
AUDIO_TYPE_PROCESSING;
break;
case AUDIO_FMT_MIDI:
/* We only support Format 0 */
caps->ac_controls.b[0] = AUDIO_SUBFMT_END;
break;
default:
caps->ac_controls.b[0] = AUDIO_SUBFMT_END;
break;
}
break;
/* Provide capabilities of our OUTPUT unit */
case AUDIO_TYPE_OUTPUT:
caps->ac_channels = 2;
switch (caps->ac_subtype)
{
case AUDIO_TYPE_QUERY:
/* Report the Sample rates we support */
caps->ac_controls.b[0] = AUDIO_SAMP_RATE_8K | AUDIO_SAMP_RATE_11K |
AUDIO_SAMP_RATE_16K | AUDIO_SAMP_RATE_22K |
AUDIO_SAMP_RATE_32K | AUDIO_SAMP_RATE_44K |
AUDIO_SAMP_RATE_48K;
break;
case AUDIO_FMT_MP3:
case AUDIO_FMT_WMA:
case AUDIO_FMT_PCM:
break;
default:
break;
}
break;
/* Provide capabilities of our FEATURE units */
case AUDIO_TYPE_FEATURE:
/* If the sub-type is UNDEF, then report the Feature Units we support */
if (caps->ac_subtype == AUDIO_FU_UNDEF)
{
/* Fill in the ac_controls section with the Feature Units we have */
caps->ac_controls.b[0] = AUDIO_FU_VOLUME | AUDIO_FU_BASS | AUDIO_FU_TREBLE;
caps->ac_controls.b[1] = AUDIO_FU_BALANCE >> 8;
}
else
{
/* TODO: Do we need to provide specific info for the Feature Units,
* such as volume setting ranges, etc.?
*/
}
break;
/* Provide capabilities of our PROCESSING unit */
case AUDIO_TYPE_PROCESSING:
switch (caps->ac_subtype)
{
case AUDIO_PU_UNDEF:
/* Provide the type of Processing Units we support */
caps->ac_controls.b[0] = AUDIO_PU_STEREO_EXTENDER;
break;
case AUDIO_PU_STEREO_EXTENDER:
/* Provide capabilities of our Stereo Extender */
caps->ac_controls.b[0] = AUDIO_STEXT_ENABLE | AUDIO_STEXT_WIDTH;
break;
default:
/* Other types of processing uint we don't support */
break;
}
break;
/* All others we don't support */
default:
/* Zero out the fields to indicate no support */
caps->ac_subtype = 0;
caps->ac_channels = 0;
break;
}
/* Return the length of the audio_caps_s struct for validation of
* proper Audio device type.
*/
return caps->ac_len;
}
/****************************************************************************
* Name: wm8904_configure
*
* Description:
* Configure the audio device for the specified mode of operation.
*
****************************************************************************/
#ifdef CONFIG_AUDIO_MULTI_SESSION
static int wm8904_configure(FAR struct audio_lowerhalf_s *dev,
FAR void *session,
FAR const struct audio_caps_s *caps)
#else
static int wm8904_configure(FAR struct audio_lowerhalf_s *dev,
FAR const struct audio_caps_s *caps)
#endif
{
#if !defined(CONFIG_AUDIO_EXCLUDE_VOLUME) || !defined(CONFIG_AUDIO_EXCLUDE_TONE)
FAR struct wm8904_dev_s *priv = (FAR struct wm8904_dev_s *)dev;
#endif
int ret = OK;
DEBUGASSERT(priv && caps);
audinfo("ac_type: %d\n", caps->ac_type);
/* Process the configure operation */
switch (caps->ac_type)
{
case AUDIO_TYPE_FEATURE:
audinfo(" AUDIO_TYPE_FEATURE\n");
/* Process based on Feature Unit */
switch (caps->ac_format.hw)
{
#ifndef CONFIG_AUDIO_EXCLUDE_VOLUME
case AUDIO_FU_VOLUME:
{
/* Set the volume */
uint16_t volume = caps->ac_controls.hw[0];
audinfo(" Volume: %d\n", volume);
if (volume >= 0 && volume <= 1000)
{
/* Scale the volume setting to the range {0.. 63} */
wm8904_setvolume(priv, (63 * volume / 1000), priv->mute);
}
else
{
ret = -EDOM;
}
}
break;
#endif /* CONFIG_AUDIO_EXCLUDE_VOLUME */
#ifndef CONFIG_AUDIO_EXCLUDE_TONE
case AUDIO_FU_BASS:
{
/* Set the bass. The percentage level (0-100) is in the
* ac_controls.b[0] parameter.
*/
uint8_t bass = caps->ac_controls.b[0];
audinfo(" Bass: %d\n", bass);
if (bass <= 100)
{
wm8904_setbass(priv, bass);
}
else
{
ret = -EDOM;
}
}
break;
case AUDIO_FU_TREBLE:
{
/* Set the treble. The percentage level (0-100) is in the
* ac_controls.b[0] parameter.
*/
uint8_t treble = caps->ac_controls.b[0];
audinfo(" Treble: %d\n", treble);
if (treble <= 100)
{
wm8904_settreble(priv, treble);
}
else
{
ret = -EDOM;
}
}
break;
#endif /* CONFIG_AUDIO_EXCLUDE_TONE */
default:
auderr(" ERROR: Unrecognized feature unit\n");
ret = -ENOTTY;
break;
}
break;
case AUDIO_TYPE_OUTPUT:
{
audinfo(" AUDIO_TYPE_OUTPUT:\n");
audinfo(" Number of channels: %u\n", caps->ac_channels);
audinfo(" Sample rate: %u\n", caps->ac_controls.hw[0]);
audinfo(" Sample width: %u\n", caps->ac_controls.b[2]);
/* Verify that all of the requested values are supported */
ret = -ERANGE;
if (caps->ac_channels != 1 && caps->ac_channels != 2)
{
auderr("ERROR: Unsupported number of channels: %d\n",
caps->ac_channels);
break;
}
if (caps->ac_controls.b[2] != 8 && caps->ac_controls.b[2] != 16)
{
auderr("ERROR: Unsupported bits per sample: %d\n",
caps->ac_controls.b[2]);
break;
}
/* Save the current stream configuration */
priv->samprate = caps->ac_controls.hw[0];
priv->nchannels = caps->ac_channels;
priv->bpsamp = caps->ac_controls.b[2];
/* Reconfigure the FLL to support the resulting number or channels,
* bits per sample, and bitrate.
*/
wm8904_setdatawidth(priv);
wm8904_setbitrate(priv);
wm8904_writereg(priv, WM8904_DUMMY, 0x55aa);
wm8904_clock_analysis(&priv->dev, "AUDIO_TYPE_OUTPUT");
ret = OK;
}
break;
case AUDIO_TYPE_PROCESSING:
break;
}
return ret;
}
/****************************************************************************
* Name: wm8904_shutdown
*
* Description:
* Shutdown the WM8904 chip and put it in the lowest power state possible.
*
****************************************************************************/
static int wm8904_shutdown(FAR struct audio_lowerhalf_s *dev)
{
FAR struct wm8904_dev_s *priv = (FAR struct wm8904_dev_s *)dev;
DEBUGASSERT(priv);
/* First disable interrupts */
WM8904_DISABLE(priv->lower);
/* Now issue a software reset. This puts all WM8904 registers back in
* their default state.
*/
wm8904_hw_reset(priv);
return OK;
}
/****************************************************************************
* Name: wm8904_senddone
*
* Description:
* This is the I2S callback function that is invoked when the transfer
* completes.
*
****************************************************************************/
static void wm8904_senddone(FAR struct i2s_dev_s *i2s,
FAR struct ap_buffer_s *apb, FAR void *arg,
int result)
{
FAR struct wm8904_dev_s *priv = (FAR struct wm8904_dev_s *)arg;
struct audio_msg_s msg;
irqstate_t flags;
int ret;
DEBUGASSERT(i2s && priv && priv->running && apb);
audinfo("apb=%p inflight=%d result=%d\n", apb, priv->inflight, result);
/* We do not place any restriction on the context in which this function
* is called. It may be called from an interrupt handler. Therefore, the
* doneq and in-flight values might be accessed from the interrupt level.
* Not the best design. But we will use interrupt controls to protect
* against that possibility.
*/
flags = enter_critical_section();
/* Add the completed buffer to the end of our doneq. We do not yet
* decrement the reference count.
*/
dq_addlast((FAR dq_entry_t *)apb, &priv->doneq);
/* And decrement the number of buffers in-flight */
DEBUGASSERT(priv->inflight > 0);
priv->inflight--;
/* Save the result of the transfer */
/* REVISIT: This can be overwritten */
priv->result = result;
leave_critical_section(flags);
/* Now send a message to the worker thread, informing it that there are
* buffers in the done queue that need to be cleaned up.
*/
msg.msgId = AUDIO_MSG_COMPLETE;
ret = mq_send(priv->mq, (FAR const char *)&msg, sizeof(msg),
CONFIG_WM8904_MSG_PRIO);
if (ret < 0)
{
auderr("ERROR: mq_send failed: %d\n", errno);
}
}
/****************************************************************************
* Name: wm8904_returnbuffers
*
* Description:
* This function is called after the complete of one or more data
* transfers. This function will empty the done queue and release our
* reference to each buffer.
*
****************************************************************************/
static void wm8904_returnbuffers(FAR struct wm8904_dev_s *priv)
{
FAR struct ap_buffer_s *apb;
irqstate_t flags;
/* The doneq and in-flight values might be accessed from the interrupt
* level in some implementations. Not the best design. But we will
* use interrupt controls to protect against that possibility.
*/
flags = enter_critical_section();
while (dq_peek(&priv->doneq) != NULL)
{
/* Take the next buffer from the queue of completed transfers */
apb = (FAR struct ap_buffer_s *)dq_remfirst(&priv->doneq);
leave_critical_section(flags);
audinfo("Returning: apb=%p curbyte=%d nbytes=%d flags=%04x\n",
apb, apb->curbyte, apb->nbytes, apb->flags);
/* Are we returning the final buffer in the stream? */
if ((apb->flags & AUDIO_APB_FINAL) != 0)
{
/* Both the pending and the done queues should be empty and there
* should be no buffers in-flight.
*/
DEBUGASSERT(dq_empty(&priv->doneq) && dq_empty(&priv->pendq) &&
priv->inflight == 0);
/* Set the terminating flag. This will, eventually, cause the
* worker thread to exit (if it is not already terminating).
*/
audinfo("Terminating\n");
priv->terminating = true;
}
/* Release our reference to the audio buffer */
apb_free(apb);
/* Send the buffer back up to the previous level. */
#ifdef CONFIG_AUDIO_MULTI_SESSION
priv->dev.upper(priv->dev.priv, AUDIO_CALLBACK_DEQUEUE, apb, OK, NULL);
#else
priv->dev.upper(priv->dev.priv, AUDIO_CALLBACK_DEQUEUE, apb, OK);
#endif
flags = enter_critical_section();
}
leave_critical_section(flags);
}
/****************************************************************************
* Name: wm8904_sendbuffer
*
* Description:
* Start the transfer an audio buffer to the WM8904 via I2S. This
* will not wait for the transfer to complete but will return immediately.
* the wmd8904_senddone called will be invoked when the transfer
* completes, stimulating the worker thread to call this function again.
*
****************************************************************************/
static int wm8904_sendbuffer(FAR struct wm8904_dev_s *priv)
{
FAR struct ap_buffer_s *apb;
irqstate_t flags;
uint32_t timeout;
int shift;
int ret = OK;
/* Loop while there are audio buffers to be sent and we have few than
* CONFIG_WM8904_INFLIGHT then "in-flight"
*
* The 'inflight' value might be modified from the interrupt level in some
* implementations. We will use interrupt controls to protect against
* that possibility.
*
* The 'pendq', on the other hand, is protected via a semaphore. Let's
* hold the semaphore while we are busy here and disable the interrupts
* only while accessing 'inflight'.
*/
wm8904_takesem(&priv->pendsem);
while (priv->inflight < CONFIG_WM8904_INFLIGHT &&
dq_peek(&priv->pendq) != NULL && !priv->paused)
{
/* Take next buffer from the queue of pending transfers */
apb = (FAR struct ap_buffer_s *)dq_remfirst(&priv->pendq);
audinfo("Sending apb=%p, size=%d inflight=%d\n",
apb, apb->nbytes, priv->inflight);
/* Increment the number of buffers in-flight before sending in order
* to avoid a possible race condition.
*/
flags = enter_critical_section();
priv->inflight++;
leave_critical_section(flags);
/* Send the entire audio buffer via I2S. What is a reasonable timeout
* to use? This would depend on the bit rate and size of the buffer.
*
* Samples in the buffer (samples):
* = buffer_size * 8 / bpsamp samples
* Sample rate (samples/second):
* = samplerate * nchannels
* Expected transfer time (seconds):
* = (buffer_size * 8) / bpsamp / samplerate / nchannels
*
* We will set the timeout about twice that.
*
* NOTES:
* - The multiplier of 8 becomes 16000 for 2x and units of
* milliseconds.
* - 16000 is a approximately 16384 (1 << 14), bpsamp is either
* (1 << 3) or (1 << 4), and nchannels is either (1 << 0) or
* (1 << 1). So this can be simplifies to (milliseconds):
*
* = (buffer_size << shift) / samplerate
*/
shift = (priv->bpsamp == 8) ? 14 - 3 : 14 - 4;
shift -= (priv->nchannels > 1) ? 1 : 0;
timeout = MSEC2TICK(((uint32_t)(apb->nbytes - apb->curbyte) << shift) /
(uint32_t)priv->samprate);
ret = I2S_SEND(priv->i2s, apb, wm8904_senddone, priv, timeout);
if (ret < 0)
{
auderr("ERROR: I2S_SEND failed: %d\n", ret);
break;
}
}
wm8904_givesem(&priv->pendsem);
return ret;
}
/****************************************************************************
* Name: wm8904_start
*
* Description:
* Start the configured operation (audio streaming, volume enabled, etc.).
*
****************************************************************************/
#ifdef CONFIG_AUDIO_MULTI_SESSION
static int wm8904_start(FAR struct audio_lowerhalf_s *dev, FAR void *session)
#else
static int wm8904_start(FAR struct audio_lowerhalf_s *dev)
#endif
{
FAR struct wm8904_dev_s *priv = (FAR struct wm8904_dev_s *)dev;
struct sched_param sparam;
struct mq_attr attr;
pthread_attr_t tattr;
FAR void *value;
int ret;
audinfo("Entry\n");
/* Exit reduced power modes of operation */
/* REVISIT */
/* Create a message queue for the worker thread */
snprintf(priv->mqname, sizeof(priv->mqname), "/tmp/%X", priv);
attr.mq_maxmsg = 16;
attr.mq_msgsize = sizeof(struct audio_msg_s);
attr.mq_curmsgs = 0;
attr.mq_flags = 0;
priv->mq = mq_open(priv->mqname, O_RDWR | O_CREAT, 0644, &attr);
if (priv->mq == NULL)
{
/* Error creating message queue! */
auderr("ERROR: Couldn't allocate message queue\n");
return -ENOMEM;
}
/* Join any old worker thread we had created to prevent a memory leak */
if (priv->threadid != 0)
{
audinfo("Joining old thread\n");
pthread_join(priv->threadid, &value);
}
/* Start our thread for sending data to the device */
pthread_attr_init(&tattr);
sparam.sched_priority = sched_get_priority_max(SCHED_FIFO) - 3;
(void)pthread_attr_setschedparam(&tattr, &sparam);
(void)pthread_attr_setstacksize(&tattr, CONFIG_WM8904_WORKER_STACKSIZE);
audinfo("Starting worker thread\n");
ret = pthread_create(&priv->threadid, &tattr, wm8904_workerthread,
(pthread_addr_t)priv);
if (ret != OK)
{
auderr("ERROR: pthread_create failed: %d\n", ret);
}
else
{
pthread_setname_np(priv->threadid, "wm8904");
audinfo("Created worker thread\n");
}
return ret;
}
/****************************************************************************
* Name: wm8904_stop
*
* Description: Stop the configured operation (audio streaming, volume
* disabled, etc.).
*
****************************************************************************/
#ifndef CONFIG_AUDIO_EXCLUDE_STOP
#ifdef CONFIG_AUDIO_MULTI_SESSION
static int wm8904_stop(FAR struct audio_lowerhalf_s *dev, FAR void *session)
#else
static int wm8904_stop(FAR struct audio_lowerhalf_s *dev)
#endif
{
FAR struct wm8904_dev_s *priv = (FAR struct wm8904_dev_s *)dev;
struct audio_msg_s term_msg;
FAR void *value;
/* Send a message to stop all audio streaming */
term_msg.msgId = AUDIO_MSG_STOP;
term_msg.u.data = 0;
mq_send(priv->mq, (FAR const char *)&term_msg, sizeof(term_msg),
CONFIG_WM8904_MSG_PRIO);
/* Join the worker thread */
pthread_join(priv->threadid, &value);
priv->threadid = 0;
/* Enter into a reduced power usage mode */
/* REVISIT: */
return OK;
}
#endif
/****************************************************************************
* Name: wm8904_pause
*
* Description: Pauses the playback.
*
****************************************************************************/
#ifndef CONFIG_AUDIO_EXCLUDE_PAUSE_RESUME
#ifdef CONFIG_AUDIO_MULTI_SESSION
static int wm8904_pause(FAR struct audio_lowerhalf_s *dev, FAR void *session)
#else
static int wm8904_pause(FAR struct audio_lowerhalf_s *dev)
#endif
{
FAR struct wm8904_dev_s *priv = (FAR struct wm8904_dev_s *)dev;
if (priv->running && !priv->paused)
{
/* Disable interrupts to prevent us from suppling any more data */
priv->paused = true;
wm8904_setvolume(priv, priv->volume, true);
WM8904_DISABLE(priv->lower);
}
return OK;
}
#endif /* CONFIG_AUDIO_EXCLUDE_PAUSE_RESUME */
/****************************************************************************
* Name: wm8904_resume
*
* Description: Resumes the playback.
*
****************************************************************************/
#ifndef CONFIG_AUDIO_EXCLUDE_PAUSE_RESUME
#ifdef CONFIG_AUDIO_MULTI_SESSION
static int wm8904_resume(FAR struct audio_lowerhalf_s *dev, FAR void *session)
#else
static int wm8904_resume(FAR struct audio_lowerhalf_s *dev)
#endif
{
FAR struct wm8904_dev_s *priv = (FAR struct wm8904_dev_s *)dev;
if (priv->running && priv->paused)
{
priv->paused = false;
wm8904_setvolume(priv, priv->volume, false);
/* Enable interrupts to allow sampling data */
wm8904_sendbuffer(priv);
#ifdef WM8904_USE_FFLOCK_INT
WM8904_ENABLE(priv->lower);
#endif
}
return OK;
}
#endif /* CONFIG_AUDIO_EXCLUDE_PAUSE_RESUME */
/****************************************************************************
* Name: wm8904_enqueuebuffer
*
* Description: Enqueue an Audio Pipeline Buffer for playback/ processing.
*
****************************************************************************/
static int wm8904_enqueuebuffer(FAR struct audio_lowerhalf_s *dev,
FAR struct ap_buffer_s *apb)
{
FAR struct wm8904_dev_s *priv = (FAR struct wm8904_dev_s *)dev;
struct audio_msg_s term_msg;
int ret;
audinfo("Enqueueing: apb=%p curbyte=%d nbytes=%d flags=%04x\n",
apb, apb->curbyte, apb->nbytes, apb->flags);
/* Take a reference on the new audio buffer */
apb_reference(apb);
/* Add the new buffer to the tail of pending audio buffers */
wm8904_takesem(&priv->pendsem);
apb->flags |= AUDIO_APB_OUTPUT_ENQUEUED;
dq_addlast(&apb->dq_entry, &priv->pendq);
wm8904_givesem(&priv->pendsem);
/* Send a message to the worker thread indicating that a new buffer has been
* enqueued. If mq is NULL, then the playing has not yet started. In that
* case we are just "priming the pump" and we don't need to send any message.
*/
ret = OK;
if (priv->mq != NULL)
{
term_msg.msgId = AUDIO_MSG_ENQUEUE;
term_msg.u.data = 0;
ret = mq_send(priv->mq, (FAR const char *)&term_msg, sizeof(term_msg),
CONFIG_WM8904_MSG_PRIO);
if (ret < 0)
{
int errcode = errno;
DEBUGASSERT(errcode > 0);
auderr("ERROR: mq_send failed: %d\n", errcode);
UNUSED(errcode);
}
}
return ret;
}
/****************************************************************************
* Name: wm8904_cancelbuffer
*
* Description: Called when an enqueued buffer is being cancelled.
*
****************************************************************************/
static int wm8904_cancelbuffer(FAR struct audio_lowerhalf_s *dev,
FAR struct ap_buffer_s *apb)
{
audinfo("apb=%p\n", apb);
return OK;
}
/****************************************************************************
* Name: wm8904_ioctl
*
* Description: Perform a device ioctl
*
****************************************************************************/
static int wm8904_ioctl(FAR struct audio_lowerhalf_s *dev, int cmd,
unsigned long arg)
{
#ifdef CONFIG_AUDIO_DRIVER_SPECIFIC_BUFFERS
FAR struct ap_buffer_info_s *bufinfo;
#endif
/* Deal with ioctls passed from the upper-half driver */
switch (cmd)
{
/* Check for AUDIOIOC_HWRESET ioctl. This ioctl is passed straight
* through from the upper-half audio driver.
*/
case AUDIOIOC_HWRESET:
{
/* REVISIT: Should we completely re-initialize the chip? We
* can't just issue a software reset; that would puts all WM8904
* registers back in their default state.
*/
audinfo("AUDIOIOC_HWRESET:\n");
}
break;
/* Report our preferred buffer size and quantity */
#ifdef CONFIG_AUDIO_DRIVER_SPECIFIC_BUFFERS
case AUDIOIOC_GETBUFFERINFO:
{
audinfo("AUDIOIOC_GETBUFFERINFO:\n");
bufinfo = (FAR struct ap_buffer_info_s *) arg;
bufinfo->buffer_size = CONFIG_WM8904_BUFFER_SIZE;
bufinfo->nbuffers = CONFIG_WM8904_NUM_BUFFERS;
}
break;
#endif
default:
audinfo("Ignored\n");
break;
}
return OK;
}
/****************************************************************************
* Name: wm8904_reserve
*
* Description: Reserves a session (the only one we have).
*
****************************************************************************/
#ifdef CONFIG_AUDIO_MULTI_SESSION
static int wm8904_reserve(FAR struct audio_lowerhalf_s *dev,
FAR void **session)
#else
static int wm8904_reserve(FAR struct audio_lowerhalf_s *dev)
#endif
{
FAR struct wm8904_dev_s *priv = (FAR struct wm8904_dev_s *) dev;
int ret = OK;
/* Borrow the APBQ semaphore for thread sync */
wm8904_takesem(&priv->pendsem);
if (priv->reserved)
{
ret = -EBUSY;
}
else
{
/* Initialize the session context */
#ifdef CONFIG_AUDIO_MULTI_SESSION
*session = NULL;
#endif
priv->inflight = 0;
priv->running = false;
priv->paused = false;
#ifndef CONFIG_AUDIO_EXCLUDE_STOP
priv->terminating = false;
#endif
priv->reserved = true;
}
wm8904_givesem(&priv->pendsem);
return ret;
}
/****************************************************************************
* Name: wm8904_release
*
* Description: Releases the session (the only one we have).
*
****************************************************************************/
#ifdef CONFIG_AUDIO_MULTI_SESSION
static int wm8904_release(FAR struct audio_lowerhalf_s *dev,
FAR void *session)
#else
static int wm8904_release(FAR struct audio_lowerhalf_s *dev)
#endif
{
FAR struct wm8904_dev_s *priv = (FAR struct wm8904_dev_s *)dev;
void *value;
/* Join any old worker thread we had created to prevent a memory leak */
if (priv->threadid != 0)
{
pthread_join(priv->threadid, &value);
priv->threadid = 0;
}
/* Borrow the APBQ semaphore for thread sync */
wm8904_takesem(&priv->pendsem);
/* Really we should free any queued buffers here */
priv->reserved = false;
wm8904_givesem(&priv->pendsem);
return OK;
}
/****************************************************************************
* Name: wm8904_interrupt_work
*
* Description:
* WM8904 interrupt actions cannot be performed in the interrupt handler
* because I2C access is not possible in that context. Instead, all I2C
* operations are deferred to the work queue.
*
* Assumptions:
* WM8904 interrupts were disabled in the interrupt handler.
*
****************************************************************************/
#ifdef WM8904_USE_FFLOCK_INT
static void wm8904_interrupt_work(FAR void *arg)
{
FAR struct wm8904_dev_s *priv = (FAR struct wm8904_dev_s *)arg;
uint16_t regval;
DEBUGASSERT(priv && priv->lower);
/* Sample the interrupt status */
regval = wm8904_readreg(priv, WM8904_INT_STATUS);
audinfo("INT_STATUS: %04x\n", regval);
/* Check for the FLL lock interrupt. We are sloppy here since at
* present, only the FLL lock interrupt is used.
*/
DEBUGASSERT((regval & WM8904_FLL_LOCK_INT) != 0 && !priv->locked);
UNUSED(regval);
priv->locked = true;
/* Clear all pending interrupts by write 1's to the interrupt status
* register.
*
* REVISIT: Since I2C is slow and not atomic with respect to WM8904 event,
* could this not cause the lost of interrupts?
*/
wm8904_writereg(priv, WM8904_INT_STATUS, WM8904_ALL_INTS);
/* Disable further FLL lock interrupts. We are sloppy here since at
* present, only the FLL lock interrupt is used.
*/
wm8904_writereg(priv, WM8904_INT_MASK, WM8904_ALL_INTS);
#ifdef WM8904_USE_FFLOCK_INT
/* Re-enable WM8904 interrupts */
WM8904_ENABLE(priv->lower);
#endif
}
#endif
/****************************************************************************
* Name: wm8904_interrupt
*
* Description:
* This is the ISR that services the GPIO1/IRQ pin from the WM8904. It
* signals WM8904 events such FLL lock.
*
****************************************************************************/
#ifdef WM8904_USE_FFLOCK_INT
static int wm8904_interrupt(FAR const struct wm8904_lower_s *lower,
FAR void *arg)
{
FAR struct wm8904_dev_s *priv = (FAR struct wm8904_dev_s *)arg;
int ret;
DEBUGASSERT(lower && priv);
/* Disable further interrupts and perform all interrupt related activities
* on the work thread. There is nothing that we can do from the interrupt
* handler because we cannot perform I2C operations here.
*/
WM8904_DISABLE(priv->lower);
DEBUGASSERT(work_available(&priv->work));
ret = work_queue(LPWORK, &priv->work, wm8904_interrupt_work, priv, 0);
if (ret < 0)
{
auderr("ERROR: Failed to schedule work\n");
}
return OK;
}
#endif
/****************************************************************************
* Name: wm8904_workerthread
*
* This is the thread that feeds data to the chip and keeps the audio
* stream going.
*
****************************************************************************/
static void *wm8904_workerthread(pthread_addr_t pvarg)
{
FAR struct wm8904_dev_s *priv = (struct wm8904_dev_s *) pvarg;
struct audio_msg_s msg;
FAR struct ap_buffer_s *apb;
int msglen;
int prio;
audinfo("Entry\n");
#ifndef CONFIG_AUDIO_EXCLUDE_STOP
priv->terminating = false;
#endif
/* Mark ourself as running and make sure that WM8904 interrupts are
* enabled.
*/
priv->running = true;
#ifdef WM8904_USE_FFLOCK_INT
WM8904_ENABLE(priv->lower);
#endif
wm8904_setvolume(priv, priv->volume, false);
/* Loop as long as we are supposed to be running and as long as we have
* buffers in-flight.
*/
while (priv->running || priv->inflight > 0)
{
/* Check if we have been asked to terminate. We have to check if we
* still have buffers in-flight. If we do, then we can't stop until
* birds come back to roost.
*/
if (priv->terminating && priv->inflight <= 0)
{
/* We are IDLE. Break out of the loop and exit. */
break;
}
else
{
/* Check if we can send more audio buffers to the WM8904 */
wm8904_sendbuffer(priv);
}
/* Wait for messages from our message queue */
msglen = mq_receive(priv->mq, (FAR char *)&msg, sizeof(msg), &prio);
/* Handle the case when we return with no message */
if (msglen < sizeof(struct audio_msg_s))
{
auderr("ERROR: Message too small: %d\n", msglen);
continue;
}
/* Process the message */
switch (msg.msgId)
{
/* The ISR has requested more data. We will catch this case at
* the top of the loop.
*/
case AUDIO_MSG_DATA_REQUEST:
audinfo("AUDIO_MSG_DATA_REQUEST\n");
break;
/* Stop the playback */
#ifndef CONFIG_AUDIO_EXCLUDE_STOP
case AUDIO_MSG_STOP:
/* Indicate that we are terminating */
audinfo("AUDIO_MSG_STOP: Terminating\n");
priv->terminating = true;
break;
#endif
/* We have a new buffer to send. We will catch this case at
* the top of the loop.
*/
case AUDIO_MSG_ENQUEUE:
audinfo("AUDIO_MSG_ENQUEUE\n");
break;
/* We will wake up from the I2S callback with this message */
case AUDIO_MSG_COMPLETE:
audinfo("AUDIO_MSG_COMPLETE\n");
wm8904_returnbuffers(priv);
break;
default:
auderr("ERROR: Ignoring message ID %d\n", msg.msgId);
break;
}
}
/* Reset the WM8904 hardware */
wm8904_hw_reset(priv);
/* Return any pending buffers in our pending queue */
wm8904_takesem(&priv->pendsem);
while ((apb = (FAR struct ap_buffer_s *)dq_remfirst(&priv->pendq)) != NULL)
{
/* Release our reference to the buffer */
apb_free(apb);
/* Send the buffer back up to the previous level. */
#ifdef CONFIG_AUDIO_MULTI_SESSION
priv->dev.upper(priv->dev.priv, AUDIO_CALLBACK_DEQUEUE, apb, OK, NULL);
#else
priv->dev.upper(priv->dev.priv, AUDIO_CALLBACK_DEQUEUE, apb, OK);
#endif
}
wm8904_givesem(&priv->pendsem);
/* Return any pending buffers in our done queue */
wm8904_returnbuffers(priv);
/* Close the message queue */
mq_close(priv->mq);
mq_unlink(priv->mqname);
priv->mq = NULL;
/* Send an AUDIO_MSG_COMPLETE message to the client */
#ifdef CONFIG_AUDIO_MULTI_SESSION
priv->dev.upper(priv->dev.priv, AUDIO_CALLBACK_COMPLETE, NULL, OK, NULL);
#else
priv->dev.upper(priv->dev.priv, AUDIO_CALLBACK_COMPLETE, NULL, OK);
#endif
audinfo("Exit\n");
return NULL;
}
/****************************************************************************
* Name: wm8904_audio_output
*
* Description:
* Initialize and configure the WM8904 device as an audio output device.
*
* Input Parameters:
* priv - A reference to the driver state structure
*
* Returned Value:
* None. No failures are detected.
*
****************************************************************************/
static void wm8904_audio_output(FAR struct wm8904_dev_s *priv)
{
uint16_t regval;
/* Bias Control.
* Preserve undocumented default bit.WM8904_DUMMY
*/
regval = WM8904_ISEL_HIGH | WM8904_BIAS_ENA | 0x0010;
wm8904_writereg(priv, WM8904_BIAS_CTRL, regval);
/* VMID Control */
regval = WM8904_VMID_BUF_ENA | WM8904_VMID_RES_NORMAL | WM8904_VMID_ENA;
wm8904_writereg(priv, WM8904_VMID_CTRL, regval);
/* Mic Bias Control 0 */
/* MICDET_ENA=1, MICBIAS_ENA=1 */
regval = WM8904_MICDET_ENA | WM8904_MICBIAS_ENA;
wm8904_writereg(priv, WM8904_MIC_BIAS_CTRL0, regval);
/* Mic Bias Control 1. */
wm8904_writereg(priv, WM8904_MIC_BIAS_CTRL1, 0xc000);
/* Power Management 0 */
regval = WM8904_INL_ENA | WM8904_INR_ENA;
wm8904_writereg(priv, WM8904_PM0, regval);
/* Power Management 2 */
regval = WM8904_HPL_PGA_ENA | WM8904_HPR_PGA_ENA;
wm8904_writereg(priv, WM8904_PM2, regval);
/* Power Management 6 */
/* DACL_ENA=1, DACR_ENA=1, ADCL_ENA=1, ADCR_ENA=1 */
regval = WM8904_DACL_ENA | WM8904_DACR_ENA | WM8904_ADCL_ENA | WM8904_ADCR_ENA;
wm8904_writereg(priv, WM8904_PM6, regval);
/* Clock Rates 0.
*
* This value sets TOCLK_RATE_DIV16=0, TOCLK_RATE_X4=0, and MCLK_DIV=0 while
* preserving the state of some undocumented bits (see wm8904.h).
*
* MCLK_DIV=0 : MCLK is is not divided by 2.
*/
wm8904_writereg(priv, WM8904_CLKRATE0, 0x845e);
/* Clock Rates 1.
*
* Contains settings the control the sample rate.
*/
/* Clock Rates 2
*
* Contains various controls. Some that are controlled here include:
*
* WM8904_MCLK_INV=0 : MCLK is not inverted
* WM8904_SYSCLK_SRC=1 : SYSCLK source is FLL
* WM8904_TOCLK_RATE=0 :
* WM8904_OPCLK_ENA=0 :
* WM8904_CLK_SYS_ENA=1 : SYSCLK is enabled
* WM8904_CLK_DSP_ENA=1 : DSP clock is enabled
* WM8904_TOCLK_ENA=0 :
*/
regval = WM8904_SYSCLK_SRCFLL | WM8904_CLK_SYS_ENA | WM8904_CLK_DSP_ENA;
wm8904_writereg(priv, WM8904_CLKRATE2, regval);
/* Audio Interface 0.
*
* Reset value is:
* No DAC invert
* No volume boost
* No loopback
* Left/Right ADC/DAC channels output on Left/Right
* Companding options set by wm8904_setdatawidth()
*/
wm8904_setdatawidth(priv);
/* Audio Interface 1.
*
* This value sets AIFADC_TDM=0, AIFADC_TDM_CHAN=0, BCLK_DIR=1 while preserving
* the state of some undocumented bits (see wm8904.h).
*
* Digital audio interface format : I2S
* Digital audio interface word length : 24
* AIF_LRCLK_INV=0 : LRCLK not inverted
* BCLK_DIR=1 : BCLK is an output (will clock I2S).
* AIF_BCLK_INV=0 : BCLK not inverted
* AIF_TRIS=0 : Outputs not tri-stated
* AIFADC_TDM_CHAN=0 : ADCDAT outputs data on slot 0
* AIFADC_TDM=0 : Normal ADCDAT operation
* AIFDAC_TDM_CHAN=0 : DACDAT data input on slot 0
* AIFDAC_TDM=0 : Normal DACDAT operation
* Bit 14: : Undocumented
*/
regval = WM8904_AIF_FMT_I2S | WM8904_AIF_WL_24BITS | WM8904_BCLK_DIR | 0x4000;
wm8904_writereg(priv, WM8904_AIF1, regval);
/* Audio Interface 2.
*
* Holds GPIO clock divider and the SYSCLK divider needed to generate BCLK.
* This will get initialized by wm8904_setbitrate().
*/
/* Audio Interface 3
*
* Set LRCLK as an output with rate = BCLK / (2*WM8904_FRAMELENn). This is
* a value that varies with bits per sample, n=8 or 16. Since I2S will send
* a word on each edge of LRCLK (after a delay), this essentially means that
* each audio frame is WM8904_FRAMELENn bits in length.
*/
regval = WM8904_LRCLK_DIR | WM8904_LRCLK_RATE(2*WM8904_FRAMELEN16);
wm8904_writereg(priv, WM8904_AIF3, regval);
/* DAC Digital 1 */
wm8904_writereg(priv, WM8904_DAC_DIGI1, 0);
/* Analogue Left Input 0 */
/* Analogue Right Input 0 */
regval = WM8904_IN_VOL(5);
wm8904_writereg(priv, WM8904_ANA_LEFT_IN0, regval);
wm8904_writereg(priv, WM8904_ANA_RIGHT_IN0, regval);
/* Analogue Left Input 1 */
wm8904_writereg(priv, WM8904_ANA_LEFT_IN1, 0);
wm8904_writereg(priv, WM8904_ANA_RIGHT_IN1, 0);
/* Analogue OUT1 Left */
/* Analogue OUT1 Right */
wm8904_setvolume(priv, CONFIG_WM8904_INITVOLUME, true);
/* DC Servo 0 */
regval = WM8904_DCS_ENA_CHAN_1 | WM8904_DCS_ENA_CHAN_0;
wm8904_writereg(priv, WM8904_DC_SERVO0, regval);
/* Analogue HP 0 */
regval = WM8904_HPL_RMV_SHORT | WM8904_HPL_ENA_OUTP | WM8904_HPL_ENA_DLY | WM8904_HPL_ENA |
WM8904_HPR_RMV_SHORT | WM8904_HPR_ENA_OUTP | WM8904_HPR_ENA_DLY | WM8904_HPR_ENA;
wm8904_writereg(priv, WM8904_ANA_HP0, regval);
/* Charge Pump 0 */
wm8904_writereg(priv, WM8904_CHG_PUMP0, WM8904_CP_ENA);
/* Class W 0 */
regval = WM8904_CP_DYN_PWR | 0x0004;
wm8904_writereg(priv, WM8904_CLASS_W0, regval);
}
/****************************************************************************
* Name: wm8904_audio_input
*
* Description:
* Initialize and configure the WM8904 device as an audio output device
* (Right input only). wm8904_audio_output() must be called first, this
* function then modifies the configuration to support audio input.
*
* Input Parameters:
* priv - A reference to the driver state structure
*
* Returned Value:
* None. No failures are detected.
*
****************************************************************************/
#if 0 /* Not used */
static void wm8904_audio_input(FAR struct wm8904_dev_s *priv)
{
/* Analogue Left Input 0 */
wm8904_writereg(priv, WM8904_ANA_LEFT_IN0, WM8904_INMUTE);
/* Analogue Right Input 0 */
wm8904_writereg(priv, WM8904_ANA_RIGHT_IN0, WM8904_IN_VOL(5));
/* Analogue Left Input 1 */
wm8904_writereg(priv, WM8904_ANA_LEFT_IN1, 0);
/* Analogue Right Input 1 */
wm8904_writereg(priv, WM8904_ANA_RIGHT_IN1, WM8904_IP_SEL_N_IN2L);
}
#endif
/****************************************************************************
* Name: wm8904_configure_ints
*
* Description:
* Configure the GPIO/IRQ interrupt
*
* Input Parameters:
* priv - A reference to the driver state structure
*
* Returned Value:
* None
*
****************************************************************************/
#ifdef WM8904_USE_FFLOCK_INT
static void wm8904_configure_ints(FAR struct wm8904_dev_s *priv)
{
uint16_t regval;
/* Configure GPIO1 as an IRQ
*
* WM8904_GPIO1_PU=0 : No pull-up
* WM8904_GPIO1_PD=1 : Pulled-down
* WM8904_GPIO1_SEL_IRQ : Configured as IRQ
*/
regval = (WM8904_GPIO1_SEL_IRQ | WM8904_GPIO1_PD);
wm8904_writereg(priv, WM8904_GPIO_CTRL1, regval);
/* Attach our handler to the GPIO1/IRQ interrupt */
WM8904_ATTACH(lower, wm8904_interrupt, priv);
/* Configure interrupts. wm8904_setbitrate() depends on FLL interrupts. */
wm8904_writereg(priv, WM8904_INT_STATUS, WM8904_ALL_INTS);
wm8904_writereg(priv, WM8904_INT_MASK, WM8904_ALL_INTS);
wm8904_writereg(priv, WM8904_INT_POL, 0);
wm8904_writereg(priv, WM8904_INT_DEBOUNCE, WM8904_ALL_INTS);
}
#endif
/****************************************************************************
* Name: wm8904_hw_reset
*
* Description:
* Reset and re-initialize the WM8904
*
* Input Parameters:
* priv - A reference to the driver state structure
*
* Returned Value:
* None
*
****************************************************************************/
static void wm8904_hw_reset(FAR struct wm8904_dev_s *priv)
{
/* Put audio output back to its initial configuration */
priv->samprate = WM8904_DEFAULT_SAMPRATE;
priv->nchannels = WM8904_DEFAULT_NCHANNELS;
priv->bpsamp = WM8904_DEFAULT_BPSAMP;
#if !defined(CONFIG_AUDIO_EXCLUDE_VOLUME) && !defined(CONFIG_AUDIO_EXCLUDE_BALANCE)
priv->balance = b16HALF; /* Center balance */
#endif
/* Software reset. This puts all WM8904 registers back in their
* default state.
*/
wm8904_writereg(priv, WM8904_SWRST, 0);
/* Configure the WM8904 hardware as an audio input device */
wm8904_audio_output(priv);
/* Configure interrupts */
wm8904_configure_ints(priv);
/* Configure the FLL and the LRCLK */
wm8904_setbitrate(priv);
wm8904_writereg(priv, WM8904_DUMMY, 0x55aa);
/* Dump some information and return the device instance */
wm8904_dump_registers(&priv->dev, "After configuration");
wm8904_clock_analysis(&priv->dev, "After configuration");
}
/****************************************************************************
* Public Functions
****************************************************************************/
/****************************************************************************
* Name: wm8904_initialize
*
* Description:
* Initialize the WM8904 device.
*
* Input Parameters:
* i2c - An I2C driver instance
* i2s - An I2S driver instance
* lower - Persistent board configuration data
*
* Returned Value:
* A new lower half audio interface for the WM8904 device is returned on
* success; NULL is returned on failure.
*
****************************************************************************/
FAR struct audio_lowerhalf_s *
wm8904_initialize(FAR struct i2c_master_s *i2c, FAR struct i2s_dev_s *i2s,
FAR const struct wm8904_lower_s *lower)
{
FAR struct wm8904_dev_s *priv;
uint16_t regval;
/* Sanity check */
DEBUGASSERT(i2c && i2s && lower);
/* Allocate a WM8904 device structure */
priv = (FAR struct wm8904_dev_s *)kmm_zalloc(sizeof(struct wm8904_dev_s));
if (priv)
{
/* Initialize the WM8904 device structure. Since we used kmm_zalloc,
* only the non-zero elements of the structure need to be initialized.
*/
priv->dev.ops = &g_audioops;
priv->lower = lower;
priv->i2c = i2c;
priv->i2s = i2s;
sem_init(&priv->pendsem, 0, 1);
dq_init(&priv->pendq);
dq_init(&priv->doneq);
/* Software reset. This puts all WM8904 registers back in their
* default state.
*/
wm8904_writereg(priv, WM8904_SWRST, 0);
wm8904_dump_registers(&priv->dev, "After reset");
/* Verify that WM8904 is present and available on this I2C */
regval = wm8904_readreg(priv, WM8904_ID);
if (regval != WM8904_SW_RST_DEV_ID1)
{
auderr("ERROR: WM8904 not found: ID=%04x\n", regval);
goto errout_with_dev;
}
/* Reset and reconfigure the WM8904 hardwaqre */
wm8904_hw_reset(priv);
return &priv->dev;
}
return NULL;
errout_with_dev:
sem_destroy(&priv->pendsem);
kmm_free(priv);
return NULL;
}
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