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SAMA5D4-EK: Add WM8904 initialization logic

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This commit is contained in:
Gregory Nutt 2014-07-19 11:58:53 -06:00
parent 17fdc797ed
commit 414fb2b154
5 changed files with 461 additions and 135 deletions
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46
configs/sama5d4-ek/Kconfig
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@ -198,43 +198,17 @@ config SAMA5D4EK_CHANNEL
Selects the PWM channel number that will be used to perform the PWM
test. See apps/examples/pwm.
if AUDIO_I2SCHAR && (SAMA5_SSC0 || SAMA5_SSC1)
if AUDIO_WM8904
if SAMA5_SSC0 && SAMA5_SSC1
config SAMA5D4EK_SSC_PORT
int "SSC port number"
default 0
range 0 1
config SAMA5D4EK_WM8904_I2CFREQUENCY
int "WM8904 I2C Frequency"
default 400000
range 1 400000
---help---
Specify the I2S port to use, i.e., 0 for SSC0 or 1 for SSC1
endif # SAMA5_SSC0 && SAMA5_SSC1
if SAMA5_SSC0 && !SAMA5_SSC1
config SAMA5D4EK_SSC_PORT
int
default 0
endif # SAMA5_SSC0 && !SAMA5_SSC1
if !SAMA5_SSC0 && SAMA5_SSC1
config SAMA5D4EK_SSC_PORT
int
default 1
endif # SAMA5_SSC0 && !SAMA5_SSC1
config SAMA5D4EK_I2SCHAR_MINOR
int "I2S character driver minor number"
default 0
---help---
The minor device number to use when registering the I2S character
device. The driver will be registered at /dev/is2charN where N is
the value provided by this setting.
endif # AUDIO_I2SCHAR && (SAMA5_SSC0 || SAMA5_SSC1)
This option selects the I2C frequency to use when communicating with
the WM8904 device. The default, 400KHz, is the maximum supported by
the WM8904. If you have problems communicating with the WM8904,
then you might want to try lowering this rate.
endif # AUDIO_WM8904
endif # ARCH_BOARD_SAMA5D4_EK

165
configs/sama5d4-ek/README.txt
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@ -91,8 +91,7 @@ Contents
- RTC
- Watchdog Timer
- TRNG and /dev/random
- I2S Audio Support
- WM8904 Support
- Audio Support
- TM7000 LCD/Touchscreen
- SAMA4D4-EK Configuration Options
- Configurations
@ -2709,116 +2708,84 @@ TRNG and /dev/random
CONFIG_EXAMPLES_MAXSAMPLES=64 : Default settings are probably OK
CONFIG_EXAMPLES_NSAMPLES=8
I2S Audio Support
=================
Audio Support
==============
WM8904 CODEC
------------
The SAMA4D4-EK has two devices on-board that can be used for verification
of I2S functionality: HDMI and a WM8904 audio CODEC. As of this writing,
the I2S driver is present, but there are not drivers for either the HDMI
or the WM8904.
WM8904 Audio CODEC Interface
----------------------------
WM8904 Audio CODEC Interface:
---- ------------------ ---------------- ------------- ---------------------------------------
PIO USAGE BOARD SIGNAL WM8904 PIN NOTE
---- ------------------ ---------------- ------------- ---------------------------------------
PA30 TWD0 AUDIO_TWD0_PA30 3 SDA Pulled up, See J23 note below
PA31 TWCK0 AUDIO_TWCK0_PA31 2 SCLK Pulled up
PB10 AUDIO_PCK2/EXP AUDIO_PCK2_PB10 28 MCLK
PB27 AUDIO/HDMI_TK0/EXP AUDIO_TK0_PB27 29 BCLK/GPIO4 Note TK0 and RK0 are mutually exclusive
PB26 AUDIO_RK0 AUDIO_RK0_PB26 29 " "/" " " " " " " " " " " " " " " "
PB30 AUDIO_RF/ZIG_TWCK2 AUDIO_RF0_PB30 30 LRCLK Note TF0 and RF0 are mutually exclusive
PB31 AUDIO/HDMI_TF0/EXP AUDIO_TF0_PB31 30 " " " " " " " " " " " " " " " "
PB29 AUDIO_RD0/ZIG_TWD2 AUDIO_RD0_PB29 31 ADCDAT
PB28 AUDIO/HDMI_TD0/EXP AUDIO_TD0_PB28 32 ACDAT
PE4 AUDIO_IRQ AUDIO_IRQ_PE4 1 IRQ/GPIO1 Audio interrupt
---- ------------------ ---------------- ------------- ---------------------------------------
Note that jumper J23 must be closed to connect AUDIO_TWD0_PA30
------------- ---------------- -----------------
WM8904 SAMA5D4 NuttX Pin Name
------------- ---------------- -----------------
3 SDA PA30 TWD0 PIO_TWI0_D
2 SCLK PA31 TWCK0 PIO_TWI0_CK
28 MCLK PD30 PCK0 PIO_PMC_PCK0
29 BCLK/GPIO4 PC16 TK PIO_SSC0_TK
"" " " PC19 RK PIO_SSC0_RK
30 LRCLK PC17 TF PIO_SSC0_TF
"" " " PC20 RF PIO_SSC0_RF
31 ADCDAT PC21 RD PIO_SSC0_RD
32 DACDAT PC18 TD PIO_SSC0_TD
1 IRQ/GPIO1 PD16 INT_AUDIO N/A
------------- ---------------- -----------------
WM8904 Configuration
--------------------
System Type -> SAMA5 Peripheral Support
CONFIG_SAMA5_TWI0=y : Enable TWI0 driver support
CONFIG_SAMA5_SSCO=y : Enable SSC0 driver support
CONFIG_SAMA5_XDMAC1=y : XDMAC0 required by SSC0
System Type -> SSC0 Configuration
CONFIG_SAMA5_SSC_MAXINFLIGHT=16
CONFIG_SAMA5_SSC0_DATALEN=16
Device Drivers -> SPI Driver Support
CONFIG_SPI=y : Enable SPI support
CONFIG_SPI_EXCHANGE=y : Support the exchange method
System Type -> SSC Configuration
CONFIG_SAMA5_SSC_MAXINFLIGHT=16 : Up to 16 pending DMA transfers
CONFIG_SAMA5_SSC0_MASTER=y : Master mode
CONFIG_SAMA5_SSC0_DATALEN=16 : 16-bit data
CONFIG_SAMA5_SSC0_RX=n : No receiver
CONFIG_SAMA5_SSC0_TX=y : Support a transmitter
CONFIG_SAMA5_SSC0_TX_MCKDIV=y : Transmitter gets clock from MCK/2
CONFIG_SAMA5_SSC0_MCKDIV_SAMPLERATE=48000 : Sampling at 48K samples/sec
CONFIG_SAMA5_SSC0_TX_TKOUTPUT_XFR=y : Outputs clock on TK when transferring data
Audio
CONFIG_AUDIO=y : Audio support needed
CONFIG_AUDIO_FORMAT_PCM=y : Only PCM files are supported
Drivers -> Audio
CONFIG_I2S=y : General I2S support
CONFIG_AUDIO_DEVICES=y : Audio device support
CONFIG_AUDIO_NUM_BUFFERS=8 : Number of audio buffers
CONFIG_AUDIO_BUFFER_NUMBYTES=8192 : Audio buffer size
CONFIG_AUDIO_WM8904=y : Build WM8904 driver character driver
Board Selection
CONFIG_SAMA5D4EK_WM8904_I2CFREQUENCY=400000
Library Routines
CONFIG_SCHED_WORKQUEUE=y : MW8904 driver needs work queue support
I2S Loopback Test
-----------------
The I2S driver was verified using a special I2C character driver (at
nuttx/drivers/audio/i2schar.c) and a test driver at apps/examples/i2schar.
The I2S driver was verified in loopback mode with no audio device.
[NOTE: The above statement is anticipatory: As of this writing I2S driver
verification is underway and still not complete].
This section describes the modifications to the NSH configuration that were
used to perform the I2S testing:
System Type -> SAMA5 Peripheral Support
CONFIG_SAMA5_SSCO=y : Enable SSC0 driver support
CONFIG_SAMA5_DMAC0=y : DMAC0 required by SSC0
Alternatively, SSC1 could have be used:
System Type -> SAMA5 Peripheral Support
CONFIG_SAMA5_SSC1=y : Enable SSC0 driver support
CONFIG_SAMA5_DMAC1=y : DMAC0 required by SSC0
System Type -> SSC Configuration
CONFIG_SAMA5_SSC_MAXINFLIGHT=16 : Up to 16 pending DMA transfers
CONFIG_SAMA5_SSC0_MASTER=y : Master mode
CONFIG_SAMA5_SSC0_DATALEN=16 : 16-bit data
CONFIG_SAMA5_SSC0_RX=y : Support a receiver
CONFIG_SAMA5_SSC0_RX_RKINPUT=y : Receiver gets clock from RK input
CONFIG_SAMA5_SSC0_TX=y : Support a transmitter
CONFIG_SAMA5_SSC0_TX_MCKDIV=y : Transmitter gets clock from MCK/2
CONFIG_SAMA5_SSC0_MCKDIV_SAMPLERATE=48000 : Sampling at 48K samples/sec
CONFIG_SAMA5_SSC0_TX_TKOUTPUT_XFR=y : Outputs clock on TK when transferring data
CONFIG_SAMA5_SSC0_LOOPBACK=y : Loopmode mode connects RD/TD and RK/TK
Audio
CONFIG_AUDIO=y : Audio support needed
: Defaults should be okay
Drivers -> Audio
CONFIG_I2S=y : General I2S support
CONFIG_AUDIO_DEVICES=y : Audio device support
CONFIG_AUDIO_I2SCHAR=y : Build I2S character driver
The following describes how I have the test application at
apps/examples/i2schar configured:
CONFIG_EXAMPLES_I2SCHAR=y
CONFIG_EXAMPLES_I2SCHAR_DEVPATH="/dev/i2schar0"
CONFIG_EXAMPLES_I2SCHAR_TX=y
CONFIG_EXAMPLES_I2SCHAR_TXBUFFERS=4
CONFIG_EXAMPLES_I2SCHAR_TXSTACKSIZE=1536
CONFIG_EXAMPLES_I2SCHAR_RX=y
CONFIG_EXAMPLES_I2SCHAR_RXBUFFERS=4
CONFIG_EXAMPLES_I2SCHAR_RXSTACKSIZE=1536
CONFIG_EXAMPLES_I2SCHAR_BUFSIZE=256
CONFIG_EXAMPLES_I2SCHAR_DEVINIT=y
Board Selection
CONFIG_SAMA5D4EK_I2SCHAR_MINOR=0
CONFIG_SAMA5D4EK_SSC_PORT=0 : 0 or SSC0, 1 for SSC1
Library Routines
CONFIG_SCHED_WORKQUEUE=y : Driver needs work queue support
WM8904 Support
==============
SAMA5D4 Interface
---- ------------------ ---------------- ---------- ---------------------------------------
PIO USAGE BOARD SIGNAL WM8904 PIN NOTE
---- ------------------ ---------------- ---------- ---------------------------------------
PA30 TWD0 AUDIO_TWD0_PA30 SDA Pulled up, See J23 note below
PA31 TWCK0 AUDIO_TWCK0_PA31 SCLK Pulled up
PB10 AUDIO_PCK2/EXP AUDIO_PCK2_PB10 MCLK
PB27 AUDIO/HDMI_TK0/EXP AUDIO_TK0_PB27 BCLK/GPIO4 Note TK0 and RK0 are mutually exclusive
PB26 AUDIO_RK0 AUDIO_RK0_PB26 " "/" " " " " " " " " " " " " " " "
PB30 AUDIO_RF/ZIG_TWCK2 AUDIO_RF0_PB30 LRCLK Note TF0 and RF0 are mutually exclusive
PB31 AUDIO/HDMI_TF0/EXP AUDIO_TF0_PB31 " " " " " " " " " " " " " " " "
PB29 AUDIO_RD0/ZIG_TWD2 AUDIO_RD0_PB29 ADCDAT
PB28 AUDIO/HDMI_TD0/EXP AUDIO_TD0_PB28 ACDAT
PE4 AUDIO_IRQ AUDIO_IRQ_PE4 IRQ/GPIO1 Audio interrupt
---- ------------------ ---------------- ---------- ---------------------------------------
Note that jumper J23 must be closed to connect AUDIO_TWD0_PA30
The I2S driver was verified in loopback mode with no audio device. That
test case has never been exercised on the SAMA454-EK. See the README.txt
file at SAMA5D4-EK for information about how you might implement this test
for the SAMA5D4-EK.
TM7000 LCD/Touchscreen
======================

8
configs/sama5d4-ek/src/Makefile
View File

@ -76,6 +76,14 @@ CSRCS += sam_at25.c
endif
endif
ifeq ($(CONFIG_AUDIO_WM8904),y)
ifeq ($(CONFIG_SAMA5_TWI0),y)
ifeq ($(CONFIG_SAMA5_SSC0),y)
CSRCS += sam_wm8904.c
endif
endif
endif
ifeq ($(CONFIG_SAMA5_HSMCI0),y)
CSRCS += sam_hsmci.c
else

316
configs/sama5d4-ek/src/sam_wm8904.c Normal file
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@ -0,0 +1,316 @@
/************************************************************************************
* configs/sama5d4-ek/src/sam_wm8904.c
*
* Copyright (C) 2014 Gregory Nutt. All rights reserved.
* Author: Gregory Nutt <gnutt@nuttx.org>
*
* 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 <stdbool.h>
#include <stdio.h>
#include <debug.h>
#include <assert.h>
#include <errno.h>
#include <nuttx/i2c.h>
#include <nuttx/audio/i2s.h>
#include <nuttx/audio/wm8904.h>
#include "up_arch.h"
#include "sam_pio.h"
#include "sam_twi.h"
#include "sam_ssc.h"
#include "sama5d4-ek.h"
#ifdef HAVE_WM8904
/****************************************************************************
* Pre-Processor Definitions
****************************************************************************/
/****************************************************************************
* Private Types
****************************************************************************/
struct sama5d4ek_mwinfo_s
{
/* Standard MW8904 interface */
struct wm8904_lower_s lower;
/* Extensions for the sama5d4ek board */
wm8904_handler_t handler;
FAR void *arg;
};
/****************************************************************************
* Private Function Prototypes
****************************************************************************/
/* IRQ/PIO access callbacks. These operations all hidden behind
* callbacks to isolate the WM8904 driver from differences in PIO
* interrupt handling by varying boards and MCUs. If possible,
* interrupts should be configured on both rising and falling edges
* so that contact and loss-of-contact events can be detected.
*
* attach - Attach the WM8904 interrupt handler to the PIO interrupt
* enable - Enable or disable the PIO interrupt
*/
static int wm8904_attach(FAR const struct wm8904_lower_s *lower,
wm8904_handler_t isr, FAR void *arg);
static void wm8904_enable(FAR const struct wm8904_lower_s *lower,
bool enable);
/****************************************************************************
* Private Data
****************************************************************************/
/* A reference to a structure of this type must be passed to the WM8904
* driver. This structure provides information about the configuration
* of the WM8904 and provides some board-specific hooks.
*
* Memory for this structure is provided by the caller. It is not copied
* by the driver and is presumed to persist while the driver is active.
*/
static struct sama5d4ek_mwinfo_s g_mxtinfo =
{
.lower =
{
.address = WM8904_I2C_ADDRESS,
.frequency = CONFIG_SAMA5D4EK_WM8904_I2CFREQUENCY,
.attach = wm8904_attach,
.enable = wm8904_enable,
},
};
/****************************************************************************
* Private Functions
****************************************************************************/
/****************************************************************************
* IRQ/PIO access callbacks. These operations all hidden behind
* callbacks to isolate the WM8904 driver from differences in PIO
* interrupt handling by varying boards and MCUs. If possible,
* interrupts should be configured on both rising and falling edges
* so that contact and loss-of-contact events can be detected.
*
* attach - Attach the WM8904 interrupt handler to the PIO interrupt
* enable - Enable or disable the PIO interrupt
* clear - Acknowledge/clear any pending PIO interrupt
*
****************************************************************************/
static int wm8904_attach(FAR const struct wm8904_lower_s *lower,
wm8904_handler_t isr, FAR void *arg)
{
if (isr)
{
/* Just save the address of the handler and its argument for now. The
* new handler will called via wm8904_interrupt() when the interrupt occurs.
*/
ivdbg("Attaching %p\n", isr);
g_mxtinfo.handler = isr;
g_mxtinfo.arg = arg;
}
else
{
ivdbg("Detaching %p\n", g_mxtinfo.handler);
wm8904_enable(lower, false);
g_mxtinfo.handler = NULL;
g_mxtinfo.arg = NULL;
}
return OK;
}
static void wm8904_enable(FAR const struct wm8904_lower_s *lower, bool enable)
{
/* Enable or disable interrupts */
if (enable && g_mxtinfo.handler)
{
sam_pioirqenable(IRQ_INT_WM8904);
}
else
{
sam_pioirqdisable(IRQ_INT_WM8904);
}
}
static int wm8904_interrupt(int irq, FAR void *context)
{
/* Just forward the interrupt to the WM8904 driver */
if (g_mxtinfo.handler)
{
return g_mxtinfo.handler(&g_mxtinfo.lower, g_mxtinfo.arg);
}
/* We got an interrupt with no handler. This should not
* happen.
*/
sam_pioirqdisable(IRQ_INT_WM8904);
return OK;
}
/****************************************************************************
* Public Functions
****************************************************************************/
/****************************************************************************
* Name: sam_wm8904_initialize
*
* Description:
* This function is called by platform-specific, setup logic to configure
* and register the WM8904 device. This function will register the driver
* as /dev/wm8904[x] where x is determined by the minor device number.
*
* Input Parameters:
* minor - The input device minor number
*
* Returned Value:
* Zero is returned on success. Otherwise, a negated errno value is
* returned to indicate the nature of the failure.
*
****************************************************************************/
int sam_wm8904_initialize(int minor)
{
FAR struct audio_lowerhalf_s *audio;
FAR struct i2c_dev_s *i2c;
FAR struct i2s_dev_s *i2s;
static bool initialized = false;
char devname[8];
int ret;
auddbg("minor %d\n", minor);
DEBUGASSERT(minor >= 0 && minor <= 25);
/* Have we already initialized? Since we never uninitialize we must prevent
* multiple initializations. This is necessary, for example, when the
* touchscreen example is used as a built-in application in NSH and can be
* called numerous time. It will attempt to initialize each time.
*/
if (!initialized)
{
/* Configure the WM8904 interrupt pin */
(void)sam_configpio(PIO_INT_WM8904);
/* Get an instance of the I2C interface for the WM8904 chip select */
i2c = up_i2cinitialize(WM8904_TWI_BUS);
if (!i2c)
{
auddbg("Failed to initialize TWI%d\n", WM8904_TWI_BUS);
ret = -ENODEV;
goto errout;
}
/* Get an instance of the I2S interface for the WM8904 data channel */
i2s = sam_ssc_initialize(WM8904_SSC_BUS);
if (!i2s)
{
auddbg("Failed to initialize SSC%d\n", WM8904_SSC_BUS);
ret = -ENODEV;
goto errout_with_i2c;
}
/* Now we can use these I2C and I2S interfaces to initialize the
* MW8904 which will return an audio interface.
*/
audio = wm8904_initialize(i2c, i2s, &g_mxtinfo.lower, minor);
if (!audio)
{
auddbg("Failed to initialize the WM8904\n");
ret = -ENODEV;
goto errout_with_i2s;
}
/* Configure WM8904 interrupts */
sam_pioirq(PIO_INT_WM8904);
ret = irq_attach(IRQ_INT_WM8904, wm8904_interrupt);
if (ret < 0)
{
auddbg("ERROR: Failed to register WM8904 device: %d\n", ret);
goto errout_with_audio;
}
/* Create a device name */
snprintf(devname, 8, "wm8904%c", 'a' + minor);
/* Register the WM8904 audio device */
ret = audio_register(devname, audio);
if (ret < 0)
{
auddbg("ERROR: Failed to register /dev/%s device: %d\n", devname, ret);
goto errout_with_irq;
}
/* Now we are initialized */
initialized = true;
}
return OK;
/* Error exits. Unfortunately there is no mechanism in place now to
* recover errors on initialization failures.
*/
errout_with_irq:
irq_detach(IRQ_INT_WM8904);
errout_with_audio:
errout_with_i2s:
errout_with_i2c:
errout:
return ret;
}
#endif /* HAVE_WM8904 */

61
configs/sama5d4-ek/src/sama5d4-ek.h
View File

@ -64,6 +64,7 @@
#define HAVE_USBMONITOR 1
#define HAVE_NETWORK 1
#define HAVE_MAXTOUCH 1
#define HAVE_WM8904 1
/* HSMCI */
/* Can't support MMC/SD if the card interface(s) are not enable */
@ -315,6 +316,36 @@
# endif
#endif
/* Audio */
/* Default configuration values */
#ifndef CONFIG_AUDIO_WM8904
# undef HAVE_WM8904
#endif
#ifdef HAVE_WM8904
# ifndef CONFIG_SAMA5_TWI0
# warning CONFIG_SAMA5_TWI0 is required for audio support
# undef HAVE_WM8904
# endif
# ifndef CONFIG_SAMA5_SSC0
# warning CONFIG_SAMA5_SSC0 is required for audio support
# undef HAVE_WM8904
# endif
# ifndef CONFIG_SAMA5D4EK_WM8904_I2CFREQUENCY
# warning Defaulting to maximum WM8904 I2C frequency
# define CONFIG_SAMA5D4EK_WM8904_I2CFREQUENCY 400000
# endif
# if CONFIG_SAMA5D4EK_WM8904_I2CFREQUENCY > 400000
# warning WM8904 I2C frequency cannot exceed 400KHz
# undef CONFIG_SAMA5D4EK_WM8904_I2CFREQUENCY
# define CONFIG_SAMA5D4EK_WM8904_I2CFREQUENCY 400000
# endif
#endif
/* LEDs *****************************************************************************/
/* There are 3 LEDs on the SAMA5D4-EK:
*
@ -649,6 +680,15 @@
PIO_INT_BOTHEDGES | PIO_PORT_PIOE | PIO_PIN4)
#define IRQ_INT_WM8904 SAM_IRQ_PE4
/* The MW8904 communicates on TWI0, I2C address 0x1a for control operations */
#define WM8904_TWI_BUS 0
#define WM8904_I2C_ADDRESS 0x1a
/* The MW8904 transfers data on SSC0 */
#define WM8904_SSC_BUS 0
/* SPI Chip Selects *****************************************************************/
/* The SAMA5D4-EK includes an Atmel AT25DF321A, 32-megabit, 2.7-volt SPI serial
* FLASH on board. The connection is as follows:
@ -859,6 +899,27 @@ void board_led_initialize(void);
int nsh_archinitialize(void);
#endif
/****************************************************************************
* Name: sam_wm8904_initialize
*
* Description:
* This function is called by platform-specific, setup logic to configure
* and register the WM8904 device. This function will register the driver
* as /dev/wm8904[x] where x is determined by the minor device number.
*
* Input Parameters:
* minor - The input device minor number
*
* Returned Value:
* Zero is returned on success. Otherwise, a negated errno value is
* returned to indicate the nature of the failure.
*
****************************************************************************/
#ifdef HAVE_WM8904
int sam_wm8904_initialize(int minor);
#endif /* HAVE_WM8904 */
#endif /* __ASSEMBLY__ */
#endif /* __CONFIGS_SAMA5D4_EK_SRC_SAMA5D4_EK_H */