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    Subject[Patch V6 07/10] ASoC: qcom: Add Storm machine driver
    Date
    From: Kenneth Westfield <kwestfie@codeaurora.org>

    Add machine driver for the Storm board with the
    IPQ806X SOC connected to the MAX98357A DAC.

    Signed-off-by: Kenneth Westfield <kwestfie@codeaurora.org>
    Acked-by: Banajit Goswami <bgoswami@codeaurora.org>
    ---
    sound/soc/qcom/storm.c | 162 +++++++++++++++++++++++++++++++++++++++++++++++++
    1 file changed, 162 insertions(+)
    create mode 100644 sound/soc/qcom/storm.c

    diff --git a/sound/soc/qcom/storm.c b/sound/soc/qcom/storm.c
    new file mode 100644
    index 0000000000000000000000000000000000000000..5b981af4aa38a6a3bba926b3dd877239eefe8cb0
    --- /dev/null
    +++ b/sound/soc/qcom/storm.c
    @@ -0,0 +1,162 @@
    +/*
    + * 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, "%s() invalid bit width given: %d\n",
    + __func__, 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, "%s() error setting sysclk to %u: %d\n",
    + __func__, sysclk_freq, ret);
    + return ret;
    + }
    +
    + return 0;
    +}
    +
    +static 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 struct snd_soc_card storm_soc_card = {
    + .name = "ipq806x-storm",
    + .dev = NULL,
    +};
    +
    +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, "%s() error getting cpu phandle\n",
    + __func__);
    + 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, "%s() error getting codec phandle\n",
    + __func__);
    + return -EINVAL;
    + }
    +
    + return 0;
    +}
    +
    +static int storm_platform_probe(struct platform_device *pdev)
    +{
    + struct snd_soc_card *card = &storm_soc_card;
    + int ret;
    +
    + if (card->dev) {
    + dev_err(&pdev->dev, "%s() error, existing soundcard\n",
    + __func__);
    + return -ENODEV;
    + }
    + card->dev = &pdev->dev;
    + platform_set_drvdata(pdev, card);
    +
    + ret = snd_soc_of_parse_card_name(card, "qcom,model");
    + if (ret) {
    + dev_err(&pdev->dev, "%s() error parsing card name: %d\n",
    + __func__, ret);
    + return ret;
    + }
    +
    + card->dai_link = &storm_dai_link;
    + card->num_links = 1;
    +
    + ret = storm_parse_of(card);
    + if (ret) {
    + dev_err(&pdev->dev, "%s() error resolving dai links: %d\n",
    + __func__, ret);
    + return ret;
    + }
    +
    + ret = devm_snd_soc_register_card(&pdev->dev, card);
    + if (ret == -EPROBE_DEFER) {
    + card->dev = NULL;
    + return ret;
    + } else if (ret) {
    + dev_err(&pdev->dev, "%s() error registering soundcard: %d\n",
    + __func__, ret);
    + return ret;
    + }
    +
    + return 0;
    +}
    +
    +#ifdef CONFIG_OF
    +static const struct of_device_id storm_device_id[] = {
    + { .compatible = "google,storm" },
    + {},
    +};
    +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");
    --
    The Qualcomm Innovation Center, Inc. is a member of the Code Aurora Forum,
    a Linux Foundation Collaborative Project


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