mirror of
https://mirrors.bfsu.edu.cn/git/linux.git
synced 2024-11-17 09:14:19 +08:00
3bb2991c1d
First of all,the address of pdev->dev is assigned to card->dev,then the function platform_set_drvdata copies the value the variable card to pdev->dev.driver_data, but when calling snd_soc_register_card,the function dev_set_drvdata(card->dev, card) will also do the same copy operation,so i think that the former copy operation can be removed. Signed-off-by: Peng Donglin <dolinux.peng@gmail.com> Acked-by: Banajit Goswami <bgoswami@codeaurora.org> Signed-off-by: Mark Brown <broonie@kernel.org>
146 lines
3.7 KiB
C
146 lines
3.7 KiB
C
/*
|
|
* Copyright (c) 2010-2011,2013-2015 The Linux Foundation. All rights reserved.
|
|
*
|
|
* This program is free software; you can redistribute it and/or modify
|
|
* it under the terms of the GNU General Public License version 2 and
|
|
* only 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.
|
|
*
|
|
* storm.c -- ALSA SoC machine driver for QTi ipq806x-based Storm board
|
|
*/
|
|
|
|
#include <linux/device.h>
|
|
#include <linux/module.h>
|
|
#include <linux/of.h>
|
|
#include <linux/mod_devicetable.h>
|
|
#include <linux/platform_device.h>
|
|
#include <sound/pcm.h>
|
|
#include <sound/pcm_params.h>
|
|
#include <sound/soc.h>
|
|
|
|
#define STORM_SYSCLK_MULT 4
|
|
|
|
static int storm_ops_hw_params(struct snd_pcm_substream *substream,
|
|
struct snd_pcm_hw_params *params)
|
|
{
|
|
struct snd_soc_pcm_runtime *soc_runtime = substream->private_data;
|
|
struct snd_soc_card *card = soc_runtime->card;
|
|
snd_pcm_format_t format = params_format(params);
|
|
unsigned int rate = params_rate(params);
|
|
unsigned int sysclk_freq;
|
|
int bitwidth, ret;
|
|
|
|
bitwidth = snd_pcm_format_width(format);
|
|
if (bitwidth < 0) {
|
|
dev_err(card->dev, "invalid bit width given: %d\n", bitwidth);
|
|
return bitwidth;
|
|
}
|
|
|
|
/*
|
|
* as the CPU DAI is the I2S bus master and no system clock is needed by
|
|
* the MAX98357a DAC, simply set the system clock to be a constant
|
|
* multiple of the bit clock for the clock divider
|
|
*/
|
|
sysclk_freq = rate * bitwidth * 2 * STORM_SYSCLK_MULT;
|
|
|
|
ret = snd_soc_dai_set_sysclk(soc_runtime->cpu_dai, 0, sysclk_freq, 0);
|
|
if (ret) {
|
|
dev_err(card->dev, "error setting sysclk to %u: %d\n",
|
|
sysclk_freq, ret);
|
|
return ret;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static const struct snd_soc_ops storm_soc_ops = {
|
|
.hw_params = storm_ops_hw_params,
|
|
};
|
|
|
|
static struct snd_soc_dai_link storm_dai_link = {
|
|
.name = "Primary",
|
|
.stream_name = "Primary",
|
|
.codec_dai_name = "HiFi",
|
|
.ops = &storm_soc_ops,
|
|
};
|
|
|
|
static int storm_parse_of(struct snd_soc_card *card)
|
|
{
|
|
struct snd_soc_dai_link *dai_link = card->dai_link;
|
|
struct device_node *np = card->dev->of_node;
|
|
|
|
dai_link->cpu_of_node = of_parse_phandle(np, "cpu", 0);
|
|
if (!dai_link->cpu_of_node) {
|
|
dev_err(card->dev, "error getting cpu phandle\n");
|
|
return -EINVAL;
|
|
}
|
|
dai_link->platform_of_node = dai_link->cpu_of_node;
|
|
|
|
dai_link->codec_of_node = of_parse_phandle(np, "codec", 0);
|
|
if (!dai_link->codec_of_node) {
|
|
dev_err(card->dev, "error getting codec phandle\n");
|
|
return -EINVAL;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int storm_platform_probe(struct platform_device *pdev)
|
|
{
|
|
struct snd_soc_card *card;
|
|
int ret;
|
|
|
|
card = devm_kzalloc(&pdev->dev, sizeof(*card), GFP_KERNEL);
|
|
if (!card)
|
|
return -ENOMEM;
|
|
|
|
card->dev = &pdev->dev;
|
|
|
|
ret = snd_soc_of_parse_card_name(card, "qcom,model");
|
|
if (ret) {
|
|
dev_err(&pdev->dev, "error parsing card name: %d\n", ret);
|
|
return ret;
|
|
}
|
|
|
|
card->dai_link = &storm_dai_link;
|
|
card->num_links = 1;
|
|
|
|
ret = storm_parse_of(card);
|
|
if (ret) {
|
|
dev_err(&pdev->dev, "error resolving dai links: %d\n", ret);
|
|
return ret;
|
|
}
|
|
|
|
ret = devm_snd_soc_register_card(&pdev->dev, card);
|
|
if (ret)
|
|
dev_err(&pdev->dev, "error registering soundcard: %d\n", ret);
|
|
|
|
return ret;
|
|
|
|
}
|
|
|
|
#ifdef CONFIG_OF
|
|
static const struct of_device_id storm_device_id[] = {
|
|
{ .compatible = "google,storm-audio" },
|
|
{},
|
|
};
|
|
MODULE_DEVICE_TABLE(of, storm_device_id);
|
|
#endif
|
|
|
|
static struct platform_driver storm_platform_driver = {
|
|
.driver = {
|
|
.name = "storm-audio",
|
|
.of_match_table =
|
|
of_match_ptr(storm_device_id),
|
|
},
|
|
.probe = storm_platform_probe,
|
|
};
|
|
module_platform_driver(storm_platform_driver);
|
|
|
|
MODULE_DESCRIPTION("QTi IPQ806x-based Storm Machine Driver");
|
|
MODULE_LICENSE("GPL v2");
|