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Diffstat (limited to '')
| -rw-r--r-- | sound/soc/atmel/sam9g20_wm8731.c | 276 |
1 files changed, 276 insertions, 0 deletions
diff --git a/sound/soc/atmel/sam9g20_wm8731.c b/sound/soc/atmel/sam9g20_wm8731.c new file mode 100644 index 000000000..8a55d59a6 --- /dev/null +++ b/sound/soc/atmel/sam9g20_wm8731.c @@ -0,0 +1,276 @@ +// SPDX-License-Identifier: GPL-2.0-or-later +/* + * sam9g20_wm8731 -- SoC audio for AT91SAM9G20-based + * ATMEL AT91SAM9G20ek board. + * + * Copyright (C) 2005 SAN People + * Copyright (C) 2008 Atmel + * + * Authors: Sedji Gaouaou <sedji.gaouaou@atmel.com> + * + * Based on ati_b1_wm8731.c by: + * Frank Mandarino <fmandarino@endrelia.com> + * Copyright 2006 Endrelia Technologies Inc. + * Based on corgi.c by: + * Copyright 2005 Wolfson Microelectronics PLC. + * Copyright 2005 Openedhand Ltd. + */ + +#include <linux/module.h> +#include <linux/moduleparam.h> +#include <linux/kernel.h> +#include <linux/clk.h> +#include <linux/timer.h> +#include <linux/interrupt.h> +#include <linux/platform_device.h> +#include <linux/i2c.h> +#include <linux/of.h> + +#include <linux/atmel-ssc.h> + +#include <sound/core.h> +#include <sound/pcm.h> +#include <sound/pcm_params.h> +#include <sound/soc.h> + +#include "../codecs/wm8731.h" +#include "atmel-pcm.h" +#include "atmel_ssc_dai.h" + +#define MCLK_RATE 12000000 + +/* + * As shipped the board does not have inputs. However, it is relatively + * straightforward to modify the board to hook them up so support is left + * in the driver. + */ +#undef ENABLE_MIC_INPUT + +static struct clk *mclk; + +static int at91sam9g20ek_set_bias_level(struct snd_soc_card *card, + struct snd_soc_dapm_context *dapm, + enum snd_soc_bias_level level) +{ + static int mclk_on; + int ret = 0; + + switch (level) { + case SND_SOC_BIAS_ON: + case SND_SOC_BIAS_PREPARE: + if (!mclk_on) + ret = clk_enable(mclk); + if (ret == 0) + mclk_on = 1; + break; + + case SND_SOC_BIAS_OFF: + case SND_SOC_BIAS_STANDBY: + if (mclk_on) + clk_disable(mclk); + mclk_on = 0; + break; + } + + return ret; +} + +static const struct snd_soc_dapm_widget at91sam9g20ek_dapm_widgets[] = { + SND_SOC_DAPM_MIC("Int Mic", NULL), + SND_SOC_DAPM_SPK("Ext Spk", NULL), +}; + +static const struct snd_soc_dapm_route intercon[] = { + + /* speaker connected to LHPOUT/RHPOUT */ + {"Ext Spk", NULL, "LHPOUT"}, + {"Ext Spk", NULL, "RHPOUT"}, + + /* mic is connected to Mic Jack, with WM8731 Mic Bias */ + {"MICIN", NULL, "Mic Bias"}, + {"Mic Bias", NULL, "Int Mic"}, +}; + +/* + * Logic for a wm8731 as connected on a at91sam9g20ek board. + */ +static int at91sam9g20ek_wm8731_init(struct snd_soc_pcm_runtime *rtd) +{ + struct snd_soc_dai *codec_dai = asoc_rtd_to_codec(rtd, 0); + struct device *dev = rtd->dev; + int ret; + + dev_dbg(dev, "%s called\n", __func__); + + ret = snd_soc_dai_set_sysclk(codec_dai, WM8731_SYSCLK_MCLK, + MCLK_RATE, SND_SOC_CLOCK_IN); + if (ret < 0) { + dev_err(dev, "Failed to set WM8731 SYSCLK: %d\n", ret); + return ret; + } + +#ifndef ENABLE_MIC_INPUT + snd_soc_dapm_nc_pin(&rtd->card->dapm, "Int Mic"); +#endif + + return 0; +} + +SND_SOC_DAILINK_DEFS(pcm, + DAILINK_COMP_ARRAY(COMP_CPU("at91rm9200_ssc.0")), + DAILINK_COMP_ARRAY(COMP_CODEC("wm8731.0-001b", "wm8731-hifi")), + DAILINK_COMP_ARRAY(COMP_PLATFORM("at91rm9200_ssc.0"))); + +static struct snd_soc_dai_link at91sam9g20ek_dai = { + .name = "WM8731", + .stream_name = "WM8731 PCM", + .init = at91sam9g20ek_wm8731_init, + .dai_fmt = SND_SOC_DAIFMT_I2S | SND_SOC_DAIFMT_NB_NF | + SND_SOC_DAIFMT_CBM_CFM, + SND_SOC_DAILINK_REG(pcm), +}; + +static struct snd_soc_card snd_soc_at91sam9g20ek = { + .name = "AT91SAMG20-EK", + .owner = THIS_MODULE, + .dai_link = &at91sam9g20ek_dai, + .num_links = 1, + .set_bias_level = at91sam9g20ek_set_bias_level, + + .dapm_widgets = at91sam9g20ek_dapm_widgets, + .num_dapm_widgets = ARRAY_SIZE(at91sam9g20ek_dapm_widgets), + .dapm_routes = intercon, + .num_dapm_routes = ARRAY_SIZE(intercon), + .fully_routed = true, +}; + +static int at91sam9g20ek_audio_probe(struct platform_device *pdev) +{ + struct device_node *np = pdev->dev.of_node; + struct device_node *codec_np, *cpu_np; + struct clk *pllb; + struct snd_soc_card *card = &snd_soc_at91sam9g20ek; + int ret; + + if (!np) { + return -ENODEV; + } + + ret = atmel_ssc_set_audio(0); + if (ret) { + dev_err(&pdev->dev, "ssc channel is not valid\n"); + return -EINVAL; + } + + /* + * Codec MCLK is supplied by PCK0 - set it up. + */ + mclk = clk_get(NULL, "pck0"); + if (IS_ERR(mclk)) { + dev_err(&pdev->dev, "Failed to get MCLK\n"); + ret = PTR_ERR(mclk); + goto err; + } + + pllb = clk_get(NULL, "pllb"); + if (IS_ERR(pllb)) { + dev_err(&pdev->dev, "Failed to get PLLB\n"); + ret = PTR_ERR(pllb); + goto err_mclk; + } + ret = clk_set_parent(mclk, pllb); + clk_put(pllb); + if (ret != 0) { + dev_err(&pdev->dev, "Failed to set MCLK parent\n"); + goto err_mclk; + } + + clk_set_rate(mclk, MCLK_RATE); + + card->dev = &pdev->dev; + + /* Parse device node info */ + ret = snd_soc_of_parse_card_name(card, "atmel,model"); + if (ret) + goto err; + + ret = snd_soc_of_parse_audio_routing(card, + "atmel,audio-routing"); + if (ret) + goto err; + + /* Parse codec info */ + at91sam9g20ek_dai.codecs->name = NULL; + codec_np = of_parse_phandle(np, "atmel,audio-codec", 0); + if (!codec_np) { + dev_err(&pdev->dev, "codec info missing\n"); + return -EINVAL; + } + at91sam9g20ek_dai.codecs->of_node = codec_np; + + /* Parse dai and platform info */ + at91sam9g20ek_dai.cpus->dai_name = NULL; + at91sam9g20ek_dai.platforms->name = NULL; + cpu_np = of_parse_phandle(np, "atmel,ssc-controller", 0); + if (!cpu_np) { + dev_err(&pdev->dev, "dai and pcm info missing\n"); + of_node_put(codec_np); + return -EINVAL; + } + at91sam9g20ek_dai.cpus->of_node = cpu_np; + at91sam9g20ek_dai.platforms->of_node = cpu_np; + + of_node_put(codec_np); + of_node_put(cpu_np); + + ret = snd_soc_register_card(card); + if (ret) { + dev_err(&pdev->dev, "snd_soc_register_card() failed\n"); + } + + return ret; + +err_mclk: + clk_put(mclk); + mclk = NULL; +err: + atmel_ssc_put_audio(0); + return ret; +} + +static int at91sam9g20ek_audio_remove(struct platform_device *pdev) +{ + struct snd_soc_card *card = platform_get_drvdata(pdev); + + clk_disable(mclk); + mclk = NULL; + snd_soc_unregister_card(card); + atmel_ssc_put_audio(0); + + return 0; +} + +#ifdef CONFIG_OF +static const struct of_device_id at91sam9g20ek_wm8731_dt_ids[] = { + { .compatible = "atmel,at91sam9g20ek-wm8731-audio", }, + { } +}; +MODULE_DEVICE_TABLE(of, at91sam9g20ek_wm8731_dt_ids); +#endif + +static struct platform_driver at91sam9g20ek_audio_driver = { + .driver = { + .name = "at91sam9g20ek-audio", + .of_match_table = of_match_ptr(at91sam9g20ek_wm8731_dt_ids), + }, + .probe = at91sam9g20ek_audio_probe, + .remove = at91sam9g20ek_audio_remove, +}; + +module_platform_driver(at91sam9g20ek_audio_driver); + +/* Module information */ +MODULE_AUTHOR("Sedji Gaouaou <sedji.gaouaou@atmel.com>"); +MODULE_DESCRIPTION("ALSA SoC AT91SAM9G20EK_WM8731"); +MODULE_ALIAS("platform:at91sam9g20ek-audio"); +MODULE_LICENSE("GPL"); |