On Sun, Aug 9, 2009 at 9:35 AM, Jon Smirl<jonsmirl@xxxxxxxxx> wrote:
> On Sat, Aug 8, 2009 at 1:39 PM, Pedro Sanchez<psanchez@xxxxxxxxxxx> wrote:
>> Hello,
>>
>> I have to develop a driver for a custom board based on the at91sam9260 with
>> a PCM1808/TAS5709 chipset combo. I am addressing the PCM1808 first because
>> it is a simpler device. Since I'm new to ASoC I'm looking for some help in
>> this list on how to go about writing this driver.
>
> I attached a PCM1690 driver I'm currently working on.
The attached fabric driver show how to use it.
>
>
>>
>> So far I have identified two files that I need to work on (other than the
>> needed kconfig modifications). First is the codec driver at
>> sound/soc/codecs/PCM1808.[c|h] which is based on the existent pcm3008
>> driver; I believe I'm fine with this.
>>
>> The second file is the machine driver at sound/soc/atmel/myBoard.c. I'm
>> using sam9g20_wm8731.c as reference, on which I believe I found a typo which
>> I reported in a separated e-mail.
>>
>> So my first question is, is this two-files step the right approach? am I in
>> the right track? I'm using the 2.6.30 kernel.
>>
>> Other questions will come and I hope I will get some cycles from you to help
>> me direct my work. Of course I'll be glad to submit my driver work for
>> inclusion in the kernel if it proves useful.
>>
>> Regards,
>>
>> --
>> Pedro
>>
>>
>> _______________________________________________
>> Alsa-devel mailing list
>> Alsa-devel@xxxxxxxxxxxxxxxx
>> http://mailman.alsa-project.org/mailman/listinfo/alsa-devel
>>
>>
>
>
>
> --
> Jon Smirl
> jonsmirl@xxxxxxxxx
>
--
Jon Smirl
jonsmirl@xxxxxxxxx
/*
* sound/soc/fsl/dspeak01_fabric.c -- The ALSA glue fabric for Digispeaker dspeak01
*
* Copyright 2008 Jon Smirl, Digispeaker
* Author: Jon Smirl <jonsmirl@xxxxxxxxx>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*/
#include <linux/module.h>
#include <linux/of_device.h>
#include <linux/of_platform.h>
#include <linux/of_i2c.h>
#include <linux/of_gpio.h>
#include <sound/soc.h>
#include <sound/soc-of-simple.h>
#include "../codecs/pcm1690.h"
#include "mpc5200_dma.h"
#include "mpc5200_psc_i2s.h"
static int dspeak01_fabric_startup(struct snd_pcm_substream *substream)
{
printk("dspeak01_fabric_startup\n");
return 0;
}
static void dspeak01_fabric_shutdown(struct snd_pcm_substream *substream)
{
printk("dspeak01_fabric_shutdown\n");
}
static int dspeak01_fabric_hw_params(struct snd_pcm_substream *substream, struct snd_pcm_hw_params *params)
{
uint rate;
int ret;
struct snd_soc_pcm_runtime *rtd = substream->private_data;
struct snd_soc_dai *cpu_dai = rtd->dai->cpu_dai;
printk("dspeak01_fabric_hw_params\n");
switch (params_rate(params)) {
case 11025:
case 22050:
case 44100:
case 88200:
case 176400:
rate = 22579200;
break;
default:
rate = 24576000;
break;
}
ret = snd_soc_dai_set_sysclk(cpu_dai, MPC52xx_CLK_INTERNAL, rate, SND_SOC_CLOCK_OUT);
if (ret < 0)
return ret;
return 0;
}
static int dspeak01_fabric_hw_free(struct snd_pcm_substream *substream)
{
printk("dspeak01_fabric_hw_free\n");
return 0;
}
static int dspeak01_fabric_prepare(struct snd_pcm_substream *substream)
{
printk("dspeak01_fabric_prepare\n");
return 0;
}
static int dspeak01_fabric_trigger(struct snd_pcm_substream *substream, int trigger)
{
printk("dspeak01_fabric_trigger\n");
return 0;
}
static struct snd_soc_ops dspeak01_fabric_ops = {
.startup = dspeak01_fabric_startup,
.shutdown = dspeak01_fabric_shutdown,
.hw_params = dspeak01_fabric_hw_params,
.hw_free = dspeak01_fabric_hw_free,
.prepare = dspeak01_fabric_prepare,
.trigger = dspeak01_fabric_trigger,
};
static struct snd_soc_device device;
static struct snd_soc_card card;
static struct snd_soc_dai_link dspeak01_fabric_dai[] = {
{
.name = "I2S-0",
.stream_name = "I2S-0",
.codec_dai = &pcm1690_dai,
.ops = &dspeak01_fabric_ops,
},
{
.name = "I2S-1",
.stream_name = "I2S-1",
.codec_dai = &pcm1690_dai,
.ops = &dspeak01_fabric_ops,
},
};
static int dspeak01_fabric_gpio_reset;
static int dspeak01_fabric_gpio_mute;
static __init int dspeak01_fabric_init_gpio(struct of_device *op, struct device_node *np, int i, int state)
{
int rc;
int gpio;
gpio = of_get_gpio(np, i);
if (gpio >= 0) {
rc = gpio_request(gpio, dev_name(&op->dev));
if (rc) {
dev_err(&op->dev, "can't request Dspeak01 gpio #%d rc %d\n", i, rc);
return rc;
}
gpio_direction_output(gpio, state);
} else
if (gpio == -EINVAL) {
dev_err(&op->dev, "Dspeak01 gpio #%d is invalid\n", i);
}
return gpio;
}
static __init int dspeak01_fabric_init(void)
{
struct of_device *op;
struct device_node *np;
struct platform_device *pdev;
struct i2c_client *i2c_dev;
int rc;
if (!machine_is_compatible("digispeaker,dspeak01"))
return -ENODEV;
card.platform = &mpc5200_audio_dma_platform;
card.name = "Digispeaker";
card.dai_link = dspeak01_fabric_dai;
dspeak01_fabric_dai[0].cpu_dai = psc_i2s_dai[0];
dspeak01_fabric_dai[1].cpu_dai = psc_i2s_dai[1];
card.num_links = ARRAY_SIZE(dspeak01_fabric_dai);
device.card = &card;
device.codec_dev = &pcm1690_soc_codec_dev;
/* Check for the codec handle. */
op = to_of_device(psc_i2s_dai[0]->dev);
np = of_parse_phandle(op->node, "codec-handle", 0);
if (np) {
i2c_dev = of_find_i2c_device_by_node(np);
device.codec_data = i2c_get_clientdata(i2c_dev);
dspeak01_fabric_gpio_reset = dspeak01_fabric_init_gpio(op, np, 0, 1);
if (dspeak01_fabric_gpio_reset < 0)
return dspeak01_fabric_gpio_reset;
dspeak01_fabric_gpio_mute = dspeak01_fabric_init_gpio(op, np, 1, 1);
if (dspeak01_fabric_gpio_mute < 0)
return dspeak01_fabric_gpio_mute;
}
pdev = platform_device_alloc("soc-audio", 1);
if (!pdev) {
pr_err("dspeak01_fabric_init: platform_device_alloc() failed\n");
return -ENODEV;
}
platform_set_drvdata(pdev, &device);
device.dev = &pdev->dev;
rc = platform_device_add(pdev);
if (rc) {
pr_err("dspeak01_fabric_init: platform_device_add() failed\n");
return -ENODEV;
}
return 0;
}
static __exit void dspeak01_fabric_exit(void)
{
}
module_init(dspeak01_fabric_init);
module_exit(dspeak01_fabric_exit);
/* Module information */
MODULE_AUTHOR("Jon Smirl");
MODULE_DESCRIPTION("ASOC Digispeaker fabric module");
MODULE_LICENSE("GPL");
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