diff options
Diffstat (limited to 'sound/soc/bcm/hifiberry_dacplushd.c')
| -rw-r--r-- | sound/soc/bcm/hifiberry_dacplushd.c | 238 |
1 files changed, 238 insertions, 0 deletions
diff --git a/sound/soc/bcm/hifiberry_dacplushd.c b/sound/soc/bcm/hifiberry_dacplushd.c new file mode 100644 index 000000000000..7e7e514a3019 --- /dev/null +++ b/sound/soc/bcm/hifiberry_dacplushd.c @@ -0,0 +1,238 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * ASoC Driver for HiFiBerry DAC+ HD + * + * Author: Joerg Schambacher, i2Audio GmbH for HiFiBerry + * Copyright 2020 + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public License + * 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/platform_device.h> +#include <linux/kernel.h> +#include <linux/delay.h> +#include <linux/module.h> +#include <linux/of.h> +#include <linux/delay.h> +#include <linux/gpio.h> +#include <linux/gpio/consumer.h> +#include <sound/core.h> +#include <sound/pcm.h> +#include <sound/pcm_params.h> +#include <sound/soc.h> +#include <linux/i2c.h> +#include <linux/clk.h> + +#include "../codecs/pcm179x.h" + +#define DEFAULT_RATE 44100 + +struct brd_drv_data { + struct regmap *regmap; + struct clk *sclk; +}; + +static struct brd_drv_data drvdata; +static struct gpio_desc *reset_gpio; +static const unsigned int hb_dacplushd_rates[] = { + 192000, 96000, 48000, 176400, 88200, 44100, +}; + +static struct snd_pcm_hw_constraint_list hb_dacplushd_constraints = { + .list = hb_dacplushd_rates, + .count = ARRAY_SIZE(hb_dacplushd_rates), +}; + +static int snd_rpi_hb_dacplushd_startup(struct snd_pcm_substream *substream) +{ + /* constraints for standard sample rates */ + snd_pcm_hw_constraint_list(substream->runtime, 0, + SNDRV_PCM_HW_PARAM_RATE, + &hb_dacplushd_constraints); + return 0; +} + +static void snd_rpi_hifiberry_dacplushd_set_sclk( + struct snd_soc_component *component, + int sample_rate) +{ + if (!IS_ERR(drvdata.sclk)) + clk_set_rate(drvdata.sclk, sample_rate); +} + +static int snd_rpi_hifiberry_dacplushd_init(struct snd_soc_pcm_runtime *rtd) +{ + struct snd_soc_dai_link *dai = rtd->dai_link; + struct snd_soc_dai *cpu_dai = asoc_rtd_to_cpu(rtd, 0); + + dai->name = "HiFiBerry DAC+ HD"; + dai->stream_name = "HiFiBerry DAC+ HD HiFi"; + dai->dai_fmt = SND_SOC_DAIFMT_I2S | SND_SOC_DAIFMT_NB_NF + | SND_SOC_DAIFMT_CBM_CFM; + + /* allow only fixed 32 clock counts per channel */ + snd_soc_dai_set_bclk_ratio(cpu_dai, 32*2); + + return 0; +} + +static int snd_rpi_hifiberry_dacplushd_hw_params( + struct snd_pcm_substream *substream, struct snd_pcm_hw_params *params) +{ + int ret = 0; + struct snd_soc_pcm_runtime *rtd = substream->private_data; + + struct snd_soc_component *component = asoc_rtd_to_codec(rtd, 0)->component; + + snd_rpi_hifiberry_dacplushd_set_sclk(component, params_rate(params)); + return ret; +} + +/* machine stream operations */ +static struct snd_soc_ops snd_rpi_hifiberry_dacplushd_ops = { + .startup = snd_rpi_hb_dacplushd_startup, + .hw_params = snd_rpi_hifiberry_dacplushd_hw_params, +}; + +SND_SOC_DAILINK_DEFS(hifi, + DAILINK_COMP_ARRAY(COMP_CPU("bcm2708-i2s.0")), + DAILINK_COMP_ARRAY(COMP_CODEC("pcm179x.1-004c", "pcm179x-hifi")), + DAILINK_COMP_ARRAY(COMP_PLATFORM("bcm2708-i2s.0"))); + + +static struct snd_soc_dai_link snd_rpi_hifiberry_dacplushd_dai[] = { +{ + .name = "HiFiBerry DAC+ HD", + .stream_name = "HiFiBerry DAC+ HD HiFi", + .dai_fmt = SND_SOC_DAIFMT_I2S | SND_SOC_DAIFMT_NB_NF | + SND_SOC_DAIFMT_CBS_CFS, + .ops = &snd_rpi_hifiberry_dacplushd_ops, + .init = snd_rpi_hifiberry_dacplushd_init, + SND_SOC_DAILINK_REG(hifi), +}, +}; + +/* audio machine driver */ +static struct snd_soc_card snd_rpi_hifiberry_dacplushd = { + .name = "snd_rpi_hifiberry_dacplushd", + .driver_name = "HifiberryDacplusHD", + .owner = THIS_MODULE, + .dai_link = snd_rpi_hifiberry_dacplushd_dai, + .num_links = ARRAY_SIZE(snd_rpi_hifiberry_dacplushd_dai), +}; + +static int snd_rpi_hifiberry_dacplushd_probe(struct platform_device *pdev) +{ + int ret = 0; + static int dac_reset_done; + struct device *dev = &pdev->dev; + struct device_node *dev_node = dev->of_node; + + snd_rpi_hifiberry_dacplushd.dev = &pdev->dev; + + /* get GPIO and release DAC from RESET */ + if (!dac_reset_done) { + reset_gpio = gpiod_get(&pdev->dev, "reset", GPIOD_OUT_LOW); + if (IS_ERR(reset_gpio)) { + dev_err(&pdev->dev, "gpiod_get() failed\n"); + return -EINVAL; + } + dac_reset_done = 1; + } + if (!IS_ERR(reset_gpio)) + gpiod_set_value(reset_gpio, 0); + msleep(1); + if (!IS_ERR(reset_gpio)) + gpiod_set_value(reset_gpio, 1); + msleep(1); + if (!IS_ERR(reset_gpio)) + gpiod_set_value(reset_gpio, 0); + + if (pdev->dev.of_node) { + struct device_node *i2s_node; + struct snd_soc_dai_link *dai; + + dai = &snd_rpi_hifiberry_dacplushd_dai[0]; + i2s_node = of_parse_phandle(pdev->dev.of_node, + "i2s-controller", 0); + + if (i2s_node) { + dai->cpus->of_node = i2s_node; + dai->platforms->of_node = i2s_node; + dai->cpus->dai_name = NULL; + dai->platforms->name = NULL; + } else { + return -EPROBE_DEFER; + } + + } + + ret = devm_snd_soc_register_card(&pdev->dev, + &snd_rpi_hifiberry_dacplushd); + if (ret && ret != -EPROBE_DEFER) { + dev_err(&pdev->dev, + "snd_soc_register_card() failed: %d\n", ret); + return ret; + } + if (ret == -EPROBE_DEFER) + return ret; + + dev_set_drvdata(dev, &drvdata); + if (dev_node == NULL) { + dev_err(&pdev->dev, "Device tree node not found\n"); + return -ENODEV; + } + + drvdata.sclk = devm_clk_get(dev, NULL); + if (IS_ERR(drvdata.sclk)) { + drvdata.sclk = ERR_PTR(-ENOENT); + return -ENODEV; + } + + clk_set_rate(drvdata.sclk, DEFAULT_RATE); + + return ret; +} + +static int snd_rpi_hifiberry_dacplushd_remove(struct platform_device *pdev) +{ + if (IS_ERR(reset_gpio)) + return -EINVAL; + + /* put DAC into RESET and release GPIO */ + gpiod_set_value(reset_gpio, 0); + gpiod_put(reset_gpio); + + return 0; +} + +static const struct of_device_id snd_rpi_hifiberry_dacplushd_of_match[] = { + { .compatible = "hifiberry,hifiberry-dacplushd", }, + {}, +}; + +MODULE_DEVICE_TABLE(of, snd_rpi_hifiberry_dacplushd_of_match); + +static struct platform_driver snd_rpi_hifiberry_dacplushd_driver = { + .driver = { + .name = "snd-rpi-hifiberry-dacplushd", + .owner = THIS_MODULE, + .of_match_table = snd_rpi_hifiberry_dacplushd_of_match, + }, + .probe = snd_rpi_hifiberry_dacplushd_probe, + .remove = snd_rpi_hifiberry_dacplushd_remove, +}; + +module_platform_driver(snd_rpi_hifiberry_dacplushd_driver); + +MODULE_AUTHOR("Joerg Schambacher <joerg@i2audio.com>"); +MODULE_DESCRIPTION("ASoC Driver for HiFiBerry DAC+ HD"); +MODULE_LICENSE("GPL v2"); |