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/**
* Freescale ALSA SoC Machine driver utility
*
* Author: Timur Tabi <timur@freescale.com>
*
* Copyright 2010 Freescale Semiconductor, Inc.
*
* This file is licensed under the terms of the GNU General Public License
* version 2. This program is licensed "as is" without any warranty of any
* kind, whether express or implied.
*/
#include <linux/module.h>
#include <linux/of_address.h>
#include <linux/of_i2c.h>
#include <sound/soc.h>
#include "fsl_utils.h"
/**
* fsl_asoc_get_codec_dev_name - determine the dev_name for a codec node
*
* @np: pointer to the I2C device tree node
* @buf: buffer to be filled with the dev_name of the I2C device
* @len: the length of the buffer
*
* This function determines the dev_name for an I2C node. This is the name
* that would be returned by dev_name() if this device_node were part of a
* 'struct device' It's ugly and hackish, but it works.
*
* The dev_name for such devices include the bus number and I2C address. For
* example, "cs4270.0-004f".
*/
int fsl_asoc_get_codec_dev_name(struct device_node *np, char *buf, size_t len)
{
const u32 *iprop;
u32 addr;
char temp[DAI_NAME_SIZE];
struct i2c_client *i2c;
of_modalias_node(np, temp, DAI_NAME_SIZE);
iprop = of_get_property(np, "reg", NULL);
if (!iprop)
return -EINVAL;
addr = be32_to_cpup(iprop);
/* We need the adapter number */
i2c = of_find_i2c_device_by_node(np);
if (!i2c) {
put_device(&i2c->dev);
return -ENODEV;
}
snprintf(buf, len, "%s.%u-%04x", temp, i2c->adapter->nr, addr);
put_device(&i2c->dev);
return 0;
}
EXPORT_SYMBOL(fsl_asoc_get_codec_dev_name);
/**
* fsl_asoc_get_dma_channel - determine the dma channel for a SSI node
*
* @ssi_np: pointer to the SSI device tree node
* @name: name of the phandle pointing to the dma channel
* @dai: ASoC DAI link pointer to be filled with platform_name
* @dma_channel_id: dma channel id to be returned
* @dma_id: dma id to be returned
*
* This function determines the dma and channel id for given SSI node. It
* also discovers the platform_name for the ASoC DAI link.
*/
int fsl_asoc_get_dma_channel(struct device_node *ssi_np,
const char *name,
struct snd_soc_dai_link *dai,
unsigned int *dma_channel_id,
unsigned int *dma_id)
{
struct resource res;
struct device_node *dma_channel_np, *dma_np;
const u32 *iprop;
int ret;
dma_channel_np = of_parse_phandle(ssi_np, name, 0);
if (!dma_channel_np)
return -EINVAL;
if (!of_device_is_compatible(dma_channel_np, "fsl,ssi-dma-channel")) {
of_node_put(dma_channel_np);
return -EINVAL;
}
/* Determine the dev_name for the device_node. This code mimics the
* behavior of of_device_make_bus_id(). We need this because ASoC uses
* the dev_name() of the device to match the platform (DMA) device with
* the CPU (SSI) device. It's all ugly and hackish, but it works (for
* now).
*
* dai->platform name should already point to an allocated buffer.
*/
ret = of_address_to_resource(dma_channel_np, 0, &res);
if (ret) {
of_node_put(dma_channel_np);
return ret;
}
snprintf((char *)dai->platform_name, DAI_NAME_SIZE, "%llx.%s",
(unsigned long long) res.start, dma_channel_np->name);
iprop = of_get_property(dma_channel_np, "cell-index", NULL);
if (!iprop) {
of_node_put(dma_channel_np);
return -EINVAL;
}
*dma_channel_id = be32_to_cpup(iprop);
dma_np = of_get_parent(dma_channel_np);
iprop = of_get_property(dma_np, "cell-index", NULL);
if (!iprop) {
of_node_put(dma_np);
return -EINVAL;
}
*dma_id = be32_to_cpup(iprop);
of_node_put(dma_np);
of_node_put(dma_channel_np);
return 0;
}
EXPORT_SYMBOL(fsl_asoc_get_dma_channel);
MODULE_AUTHOR("Timur Tabi <timur@freescale.com>");
MODULE_DESCRIPTION("Freescale ASoC utility code");
MODULE_LICENSE("GPL v2");
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