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Diffstat (limited to '')
| -rw-r--r-- | sound/soc/qcom/storm.c | 143 |
1 files changed, 143 insertions, 0 deletions
diff --git a/sound/soc/qcom/storm.c b/sound/soc/qcom/storm.c new file mode 100644 index 000000000..80c9cf2f2 --- /dev/null +++ b/sound/soc/qcom/storm.c @@ -0,0 +1,143 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * Copyright (c) 2010-2011,2013-2015 The Linux Foundation. All rights reserved. + * + * 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 = asoc_substream_to_rtd(substream); + 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(asoc_rtd_to_cpu(soc_runtime, 0), 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, +}; + +SND_SOC_DAILINK_DEFS(hifi, + DAILINK_COMP_ARRAY(COMP_EMPTY()), + DAILINK_COMP_ARRAY(COMP_CODEC(NULL, "HiFi")), + DAILINK_COMP_ARRAY(COMP_EMPTY())); + +static struct snd_soc_dai_link storm_dai_link = { + .name = "Primary", + .stream_name = "Primary", + .ops = &storm_soc_ops, + SND_SOC_DAILINK_REG(hifi), +}; + +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->cpus->of_node = of_parse_phandle(np, "cpu", 0); + if (!dai_link->cpus->of_node) { + dev_err(card->dev, "error getting cpu phandle\n"); + return -EINVAL; + } + dai_link->platforms->of_node = dai_link->cpus->of_node; + + dai_link->codecs->of_node = of_parse_phandle(np, "codec", 0); + if (!dai_link->codecs->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; + card->owner = THIS_MODULE; + + 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"); |