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/*
* Copyright (C) 2014 Motorola, Inc.
*
* 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.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
* 02111-1307, USA
*/
#include <linux/clk.h>
#include <linux/module.h>
#include <linux/of.h>
#include <sound/soc.h>
#include "omap-mcbsp.h"
/* We desire a bit clock of 512 kHz for 16 bit 2 channel 16 kHz audio. */
#define BIT_CLOCK (16000*16*2)
static struct clk *per_96m_fck;
static unsigned long rate;
static int clkdiv;
static int omap_soc_c55_hw_params(struct snd_pcm_substream *substream,
struct snd_pcm_hw_params *params)
{
struct snd_soc_pcm_runtime *rtd = substream->private_data;
struct snd_soc_dai *cpu_dai = rtd->cpu_dai;
int ret;
/* Set McBSP4 clock to use PER_96M_FCLK */
ret = snd_soc_dai_set_sysclk(cpu_dai, OMAP_MCBSP_SYSCLK_CLKS_FCLK,
rate, SND_SOC_CLOCK_OUT);
if (ret < 0) {
dev_err(rtd->dev, "can't set cpu system clock\n");
return ret;
}
ret = snd_soc_dai_set_clkdiv(cpu_dai, OMAP_MCBSP_CLKGDV, clkdiv);
if (ret < 0) {
dev_err(rtd->dev, "can't set SRG clock divider\n");
return ret;
}
return 0;
}
static int omap_soc_c55_startup(struct snd_pcm_substream *substream)
{
return clk_enable(per_96m_fck);
}
static void omap_soc_c55_shutdown(struct snd_pcm_substream *substream)
{
clk_disable(per_96m_fck);
}
static struct snd_soc_ops omap_soc_c55_ops = {
.startup = omap_soc_c55_startup,
.hw_params = omap_soc_c55_hw_params,
.shutdown = omap_soc_c55_shutdown,
};
/* Digital audio interface glue - connects codec <--> CPU */
static struct snd_soc_dai_link omap_soc_c55_dai_links[] = {
{
.name = "OMAP SOC C55 Audio",
.stream_name = "OMAP SOC C55",
.cpu_dai_name = "omap-mcbsp.4",
.codec_dai_name = "c55-voice",
.platform_name = "omap-pcm-audio",
.codec_name = "soc.1",
.dai_fmt = SND_SOC_DAIFMT_I2S | SND_SOC_DAIFMT_NB_NF |
SND_SOC_DAIFMT_CBS_CFS,
.ops = &omap_soc_c55_ops,
},
};
/* Audio machine driver */
static struct snd_soc_card omap_soc_c55_card = {
.owner = THIS_MODULE,
.dai_link = omap_soc_c55_dai_links,
.num_links = ARRAY_SIZE(omap_soc_c55_dai_links),
};
static int omap_soc_c55_probe(struct platform_device *pdev)
{
struct device_node *node = pdev->dev.of_node;
struct snd_soc_card *card = &omap_soc_c55_card;
int ret = 0;
card->dev = &pdev->dev;
#ifdef CONFIG_OF
if (node) {
struct device_node *dai_node;
if (snd_soc_of_parse_card_name(card, "mot,model")) {
dev_err(&pdev->dev, "Card name is not provided\n");
return -ENODEV;
}
dai_node = of_parse_phandle(node, "mot,mcbsp", 0);
if (!dai_node) {
dev_err(&pdev->dev, "McBSP node is not provided\n");
return -EINVAL;
}
omap_soc_c55_dai_links[0].cpu_dai_name = NULL;
omap_soc_c55_dai_links[0].cpu_of_node = dai_node;
} else {
dev_err(&pdev->dev, "Missing node\n");
return -ENODEV;
}
#endif
snd_soc_card_set_drvdata(card, NULL);
ret = snd_soc_register_card(card);
if (ret) {
dev_err(&pdev->dev, "snd_soc_register_card() failed: %d\n",
ret);
return ret;
}
per_96m_fck = clk_get(&pdev->dev, "per_96m_fck");
if (IS_ERR(per_96m_fck)) {
dev_err(&pdev->dev, "could not get per_96m_fck clock\n");
return PTR_ERR(per_96m_fck);
}
rate = clk_get_rate(per_96m_fck);
clkdiv = rate / BIT_CLOCK;
return 0;
}
static int omap_soc_c55_remove(struct platform_device *pdev)
{
struct snd_soc_card *card = platform_get_drvdata(pdev);
clk_put(per_96m_fck);
snd_soc_unregister_card(card);
return 0;
}
static const struct of_device_id omap_soc_c55_of_match[] = {
{.compatible = "mot,omap-soc-c55", },
{ },
};
MODULE_DEVICE_TABLE(of, omap_soc_c55_of_match);
static struct platform_driver omap_soc_c55_driver = {
.driver = {
.name = "omap-soc-c55",
.owner = THIS_MODULE,
.pm = &snd_soc_pm_ops,
.of_match_table = of_match_ptr(omap_soc_c55_of_match),
},
.probe = omap_soc_c55_probe,
.remove = omap_soc_c55_remove,
};
module_platform_driver(omap_soc_c55_driver);
MODULE_AUTHOR("Motorola");
MODULE_DESCRIPTION("ALSA SoC for c55 audio");
MODULE_LICENSE("GPL");
MODULE_ALIAS("platform:omap-soc-c55");
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