From: Kenneth Westfield kwestfie@codeaurora.org
Add machine driver for the boards 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/ipq806x-max98357a.c | 171 +++++++++++++++++++++++++++++++++++++ 1 file changed, 171 insertions(+) create mode 100644 sound/soc/qcom/ipq806x-max98357a.c
diff --git a/sound/soc/qcom/ipq806x-max98357a.c b/sound/soc/qcom/ipq806x-max98357a.c new file mode 100644 index 0000000000000000000000000000000000000000..af92e9ffa42104d6e29160b9e0ffedc820388c7c --- /dev/null +++ b/sound/soc/qcom/ipq806x-max98357a.c @@ -0,0 +1,171 @@ +/* + * 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. + * + * ipq806x-max98357a.c -- ALSA SoC machine driver for QTi ipq806x SOC with + * MAX98357a DAC + */ + +#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 IPQ806X_MAX98357A_SYSCLK_MULT 4 + +static int ipq806x_max98357a_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 * IPQ806X_MAX98357A_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 ipq806x_max98357a_soc_ops = { + .hw_params = ipq806x_max98357a_ops_hw_params, +}; + +static struct snd_soc_dai_link ipq806x_max98357a_dai_link = { + .name = "IPQ806x Media1", + .stream_name = "MultiMedia1", + .ops = &ipq806x_max98357a_soc_ops, +}; + +static struct snd_soc_card ipq806x_max98357a_soc_card = { + .name = "ipq806x-max98357a", + .dev = NULL, +}; + +static int ipq806x_max98357a_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; + int ret; + + 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; + } + + ret = of_property_read_string(np, "codec-dai", + &dai_link->codec_dai_name); + if (ret) { + dev_err(card->dev, "%s() error getting codec-dai: %d\n", + __func__, ret); + return -EINVAL; + } + + return 0; +} + +static int ipq806x_max98357a_platform_probe(struct platform_device *pdev) +{ + struct snd_soc_card *card = &ipq806x_max98357a_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 = &ipq806x_max98357a_dai_link; + card->num_links = 1; + + ret = ipq806x_max98357a_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 ipq806x_max98357a_device_id[] = { + { .compatible = "qcom,ipq806x-max98357a" }, + {}, +}; +MODULE_DEVICE_TABLE(of, ipq806x_max98357a_device_id); +#endif + +static struct platform_driver ipq806x_max98357a_platform_driver = { + .driver = { + .name = "ipq806x-max98357a", + .of_match_table = + of_match_ptr(ipq806x_max98357a_device_id), + }, + .probe = ipq806x_max98357a_platform_probe, +}; +module_platform_driver(ipq806x_max98357a_platform_driver); + +MODULE_DESCRIPTION("QTi ipq806x-max98357a Machine Driver"); +MODULE_LICENSE("GPL v2");