From: Kenneth Westfield <[email protected]> Add codec driver for the MAX98357A DAC.
Signed-off-by: Kenneth Westfield <[email protected]> Acked-by: Banajit Goswami <[email protected]> --- sound/soc/codecs/max98357a.c | 267 +++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 267 insertions(+) create mode 100644 sound/soc/codecs/max98357a.c diff --git a/sound/soc/codecs/max98357a.c b/sound/soc/codecs/max98357a.c new file mode 100644 index 0000000000000000000000000000000000000000..16def09e98c2318a73e136d92f0c53c81313f10f --- /dev/null +++ b/sound/soc/codecs/max98357a.c @@ -0,0 +1,267 @@ +/* Copyright (c) 2010-2011,2013-2014 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. + */ + +#include <linux/module.h> +#include <linux/gpio.h> +#include <sound/soc.h> + +#define DRV_NAME "max98357a-codec" + +enum pinctrl_pin_state { + STATE_DISABLED = 0, + STATE_ENABLED = 1 +}; +static const char * const pin_states[] = {"Disabled", "Enabled"}; + +struct max98357a_codec_pinctrl { + struct pinctrl *pinctrl; + struct pinctrl_state *disabled; + struct pinctrl_state *enabled; + enum pinctrl_pin_state curr_state; +}; + +struct max98357a_codec_data { + struct gpio_desc *dac; + struct max98357a_codec_pinctrl mi2s; +}; + +static int max98357a_codec_set_pinctrl(struct max98357a_codec_pinctrl *mi2s) +{ + int ret; + + pr_debug("%s: curr_state = %s\n", __func__, + pin_states[mi2s->curr_state]); + + switch (mi2s->curr_state) { + case STATE_DISABLED: + ret = pinctrl_select_state(mi2s->pinctrl, mi2s->enabled); + if (ret) { + pr_err("%s: pinctrl_select_state failed with %d\n", + __func__, ret); + return -EIO; + } + mi2s->curr_state = STATE_ENABLED; + break; + case STATE_ENABLED: + pr_err("%s: MI2S pins already enabled\n", __func__); + break; + default: + pr_err("%s: MI2S pin state is invalid: %d\n", __func__, + mi2s->curr_state); + return -EINVAL; + } + + return 0; +} + +static int max98357a_codec_reset_pinctrl(struct max98357a_codec_pinctrl *mi2s) +{ + int ret; + + pr_debug("%s: curr_state = %s\n", __func__, + pin_states[mi2s->curr_state]); + + switch (mi2s->curr_state) { + case STATE_ENABLED: + ret = pinctrl_select_state(mi2s->pinctrl, mi2s->disabled); + if (ret) { + pr_err("%s: pinctrl_select_state failed with %d\n", + __func__, ret); + return -EIO; + } + mi2s->curr_state = STATE_DISABLED; + break; + case STATE_DISABLED: + pr_err("%s: MI2S pins already disabled\n", __func__); + break; + default: + pr_err("%s: MI2S pin state is invalid: %d\n", __func__, + mi2s->curr_state); + return -EINVAL; + } + + return 0; +} + +static int max98357a_codec_get_pinctrl(struct snd_soc_dai *dai) +{ + int ret; + struct max98357a_codec_data *prtd = snd_soc_dai_get_drvdata(dai); + struct max98357a_codec_pinctrl *mi2s = &prtd->mi2s; + struct pinctrl *pinctrl; + + pinctrl = devm_pinctrl_get(dai->dev); + if (IS_ERR_OR_NULL(pinctrl)) { + dev_err(dai->dev, "%s: Unable to get pinctrl handle: %d\n", + __func__, PTR_ERR_OR_ZERO(pinctrl)); + return -EINVAL; + } + mi2s->pinctrl = pinctrl; + + /* get all the states handles from Device Tree */ + mi2s->disabled = pinctrl_lookup_state(pinctrl, "mi2s-disabled"); + if (IS_ERR(mi2s->disabled)) { + dev_err(dai->dev, "%s: could not get disabled pinstate: %d\n", + __func__, PTR_ERR_OR_ZERO(mi2s->disabled)); + return -EINVAL; + } + + mi2s->enabled = pinctrl_lookup_state(pinctrl, "mi2s-enabled"); + if (IS_ERR(mi2s->enabled)) { + dev_err(dai->dev, "%s: could not get enabled pinstate: %d\n", + __func__, PTR_ERR_OR_ZERO(mi2s->enabled)); + return -EINVAL; + } + + /* Reset the MI2S pins to the disabled state */ + ret = pinctrl_select_state(mi2s->pinctrl, mi2s->disabled); + if (ret) { + dev_err(dai->dev, "%s: Disable MI2S pins failed with %d\n", + __func__, ret); + return -EIO; + } + mi2s->curr_state = STATE_DISABLED; + + return 0; +} + +static int max98357a_codec_daiops_startup(struct snd_pcm_substream *substream, + struct snd_soc_dai *dai) +{ + int ret; + struct max98357a_codec_data *prtd = snd_soc_dai_get_drvdata(dai); + + ret = max98357a_codec_set_pinctrl(&prtd->mi2s); + if (ret) { + dev_err(dai->dev, "%s: MI2S pinctrl set failed with %d\n", + __func__, ret); + return ret; + } + + gpiod_set_value(prtd->dac, 1); + + return 0; +} + +static void max98357a_codec_daiops_shutdown( + struct snd_pcm_substream *substream, struct snd_soc_dai *dai) +{ + int ret; + struct max98357a_codec_data *prtd = snd_soc_dai_get_drvdata(dai); + + gpiod_set_value(prtd->dac, 0); + + ret = max98357a_codec_reset_pinctrl(&prtd->mi2s); + if (ret) + dev_err(dai->dev, "%s: MI2S pinctrl set failed with %d\n", + __func__, ret); +} + +static struct snd_soc_dai_ops max98357a_codec_dai_ops = { + .startup = max98357a_codec_daiops_startup, + .shutdown = max98357a_codec_daiops_shutdown, +}; + +static int max98357a_codec_dai_probe(struct snd_soc_dai *dai) +{ + int ret; + struct max98357a_codec_data *prtd = snd_soc_dai_get_drvdata(dai); + + prtd->dac = devm_gpiod_get(dai->dev, "dac"); + if (IS_ERR(prtd->dac)) { + dev_err(dai->dev, "unable to get DAC GPIO\n"); + return PTR_ERR(prtd->dac); + } + gpiod_direction_output(prtd->dac, 0); + + ret = max98357a_codec_get_pinctrl(dai); + if (ret) { + dev_err(dai->dev, "%s: Parsing MI2S pinctrl failed: %d\n", + __func__, ret); + return ret; + } + + return 0; +} + +static struct snd_soc_dai_driver max98357a_codec_dai_driver = { + .name = "max98357a-codec-dai", + .playback = { + .stream_name = "max98357a-codec-playback", + .formats = SNDRV_PCM_FMTBIT_S16 | + SNDRV_PCM_FMTBIT_S24 | + SNDRV_PCM_FMTBIT_S32, + .rates = SNDRV_PCM_RATE_8000 | + SNDRV_PCM_RATE_16000 | + SNDRV_PCM_RATE_48000 | + SNDRV_PCM_RATE_96000, + .rate_min = 8000, + .rate_max = 96000, + .channels_min = 1, + .channels_max = 2, + }, + .probe = &max98357a_codec_dai_probe, + .ops = &max98357a_codec_dai_ops, +}; + +static int max98357a_codec_platform_probe(struct platform_device *pdev) +{ + int ret; + struct max98357a_codec_data *prtd; + struct snd_soc_codec_driver *codec_driver; + + prtd = devm_kzalloc(&pdev->dev, sizeof(struct max98357a_codec_data), + GFP_KERNEL); + if (!prtd) + return -ENOMEM; + platform_set_drvdata(pdev, prtd); + + codec_driver = devm_kzalloc(&pdev->dev, + sizeof(struct snd_soc_codec_driver), GFP_KERNEL); + if (!codec_driver) + return -ENOMEM; + + ret = snd_soc_register_codec(&pdev->dev, codec_driver, + &max98357a_codec_dai_driver, 1); + if (ret) + dev_err(&pdev->dev, "%s: error registering codec dais\n", + __func__); + + return ret; +} + +static int max98357a_codec_platform_remove(struct platform_device *pdev) +{ + snd_soc_unregister_codec(&pdev->dev); + + return 0; +} + +static const struct of_device_id max98357a_codec_dt_match[] = { + { .compatible = "qcom,max98357a-codec", }, + {} +}; + +static struct platform_driver max98357a_codec_platform_driver = { + .driver = { + .name = DRV_NAME, + .of_match_table = max98357a_codec_dt_match, + }, + .probe = max98357a_codec_platform_probe, + .remove = max98357a_codec_platform_remove, +}; +module_platform_driver(max98357a_codec_platform_driver); + +MODULE_DESCRIPTION("QCOM MAX98357A CODEC DRIVER"); +MODULE_LICENSE("GPL v2"); +MODULE_ALIAS("platform:" DRV_NAME); +MODULE_DEVICE_TABLE(of, max98357a_codec_dt_match); -- 1.8.2.1 -- To unsubscribe from this list: send the line "unsubscribe linux-arm-msm" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html
