60aae8da29
There is some amount of code duplication between mpc8610_hpcd and p1022_ds machine drivers, and the same code will be duplicated again when another new machine driver is added. The patch creates fsl_utils to accommodate the common functions to stop the code duplication. Signed-off-by: Shawn Guo <shawn.guo@linaro.org> Acked-by: Sascha Hauer <s.hauer@pengutronix.de> Acked-by: Timur Tabi <timur@freescale.com> Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
135 lines
3.7 KiB
C
135 lines
3.7 KiB
C
/**
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* Freescale ALSA SoC Machine driver utility
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*
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* Author: Timur Tabi <timur@freescale.com>
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*
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* Copyright 2010 Freescale Semiconductor, Inc.
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*
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* This file is licensed under the terms of the GNU General Public License
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* version 2. This program is licensed "as is" without any warranty of any
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* kind, whether express or implied.
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*/
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#include <linux/module.h>
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#include <linux/of_address.h>
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#include <linux/of_i2c.h>
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#include <sound/soc.h>
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#include "fsl_utils.h"
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/**
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* fsl_asoc_get_codec_dev_name - determine the dev_name for a codec node
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*
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* @np: pointer to the I2C device tree node
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* @buf: buffer to be filled with the dev_name of the I2C device
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* @len: the length of the buffer
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*
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* This function determines the dev_name for an I2C node. This is the name
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* that would be returned by dev_name() if this device_node were part of a
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* 'struct device' It's ugly and hackish, but it works.
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*
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* The dev_name for such devices include the bus number and I2C address. For
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* example, "cs4270.0-004f".
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*/
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int fsl_asoc_get_codec_dev_name(struct device_node *np, char *buf, size_t len)
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{
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const u32 *iprop;
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u32 addr;
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char temp[DAI_NAME_SIZE];
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struct i2c_client *i2c;
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of_modalias_node(np, temp, DAI_NAME_SIZE);
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iprop = of_get_property(np, "reg", NULL);
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if (!iprop)
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return -EINVAL;
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addr = be32_to_cpup(iprop);
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/* We need the adapter number */
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i2c = of_find_i2c_device_by_node(np);
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if (!i2c) {
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put_device(&i2c->dev);
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return -ENODEV;
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}
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snprintf(buf, len, "%s.%u-%04x", temp, i2c->adapter->nr, addr);
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put_device(&i2c->dev);
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return 0;
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}
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EXPORT_SYMBOL(fsl_asoc_get_codec_dev_name);
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/**
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* fsl_asoc_get_dma_channel - determine the dma channel for a SSI node
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*
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* @ssi_np: pointer to the SSI device tree node
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* @name: name of the phandle pointing to the dma channel
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* @dai: ASoC DAI link pointer to be filled with platform_name
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* @dma_channel_id: dma channel id to be returned
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* @dma_id: dma id to be returned
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*
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* This function determines the dma and channel id for given SSI node. It
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* also discovers the platform_name for the ASoC DAI link.
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*/
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int fsl_asoc_get_dma_channel(struct device_node *ssi_np,
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const char *name,
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struct snd_soc_dai_link *dai,
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unsigned int *dma_channel_id,
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unsigned int *dma_id)
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{
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struct resource res;
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struct device_node *dma_channel_np, *dma_np;
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const u32 *iprop;
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int ret;
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dma_channel_np = of_parse_phandle(ssi_np, name, 0);
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if (!dma_channel_np)
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return -EINVAL;
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if (!of_device_is_compatible(dma_channel_np, "fsl,ssi-dma-channel")) {
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of_node_put(dma_channel_np);
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return -EINVAL;
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}
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/* Determine the dev_name for the device_node. This code mimics the
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* behavior of of_device_make_bus_id(). We need this because ASoC uses
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* the dev_name() of the device to match the platform (DMA) device with
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* the CPU (SSI) device. It's all ugly and hackish, but it works (for
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* now).
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*
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* dai->platform name should already point to an allocated buffer.
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*/
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ret = of_address_to_resource(dma_channel_np, 0, &res);
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if (ret) {
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of_node_put(dma_channel_np);
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return ret;
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}
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snprintf((char *)dai->platform_name, DAI_NAME_SIZE, "%llx.%s",
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(unsigned long long) res.start, dma_channel_np->name);
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iprop = of_get_property(dma_channel_np, "cell-index", NULL);
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if (!iprop) {
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of_node_put(dma_channel_np);
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return -EINVAL;
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}
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*dma_channel_id = be32_to_cpup(iprop);
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dma_np = of_get_parent(dma_channel_np);
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iprop = of_get_property(dma_np, "cell-index", NULL);
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if (!iprop) {
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of_node_put(dma_np);
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return -EINVAL;
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}
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*dma_id = be32_to_cpup(iprop);
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of_node_put(dma_np);
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of_node_put(dma_channel_np);
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return 0;
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}
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EXPORT_SYMBOL(fsl_asoc_get_dma_channel);
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MODULE_AUTHOR("Timur Tabi <timur@freescale.com>");
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MODULE_DESCRIPTION("Freescale ASoC utility code");
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MODULE_LICENSE("GPL v2");
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