mirror of https://github.com/Qortal/Brooklyn
You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
275 lines
7.7 KiB
275 lines
7.7 KiB
/* |
|
* ASoC Driver for ChipDip DAC |
|
* |
|
* Author: Evgenij Sapunov |
|
* Copyright 2021 |
|
* based on code by Milan Neskovic <[email protected]> |
|
* based on code by Jaikumar <[email protected]> |
|
* |
|
* Thanks to Phil Elwell (pelwell) for help. |
|
* |
|
* 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/gpio/consumer.h> |
|
#include <linux/platform_device.h> |
|
#include <linux/delay.h> |
|
|
|
#include <sound/core.h> |
|
#include <sound/pcm.h> |
|
#include <sound/pcm_params.h> |
|
#include <sound/soc.h> |
|
#include <sound/jack.h> |
|
|
|
#define SR_BIT_0 0 //sample rate bits |
|
#define SR_BIT_1 1 |
|
#define SR_BIT_2 2 |
|
#define BD_BIT_0 3 //bit depth bits |
|
#define BD_BIT_1 4 |
|
|
|
#define SAMPLE_RATE_MASK_44_1 0 |
|
#define SAMPLE_RATE_MASK_48 (1 << SR_BIT_0) |
|
#define SAMPLE_RATE_MASK_88_2 ((1 << SR_BIT_2) | (1 << SR_BIT_1)) |
|
#define SAMPLE_RATE_MASK_96 (1 << SR_BIT_1) |
|
#define SAMPLE_RATE_MASK_176_4 ((1 << SR_BIT_2) | (1 << SR_BIT_1) | (1 << SR_BIT_0)) |
|
#define SAMPLE_RATE_MASK_192 ((1 << SR_BIT_1) | (1 << SR_BIT_0)) |
|
#define SAMPLE_RATE_MASK ((1 << SR_BIT_2) | (1 << SR_BIT_1) | (1 << SR_BIT_0)) |
|
|
|
#define BIT_DEPTH_MASK_16 0 |
|
#define BIT_DEPTH_MASK_24 (1 << BD_BIT_0) |
|
#define BIT_DEPTH_MASK_32 (1 << BD_BIT_1) |
|
#define BIT_DEPTH_MASK ((1 << BD_BIT_1) | (1 << BD_BIT_0)) |
|
|
|
#define MUTE_ACTIVE 0 |
|
#define MUTE_NOT_ACTIVE 1 |
|
|
|
#define HW_PARAMS_GPIO_COUNT 5 |
|
|
|
static struct gpio_desc *mute_gpio; |
|
static struct gpio_desc *sdwn_gpio; |
|
static struct gpio_desc *hw_params_gpios[HW_PARAMS_GPIO_COUNT]; |
|
static int current_width; |
|
static int current_rate; |
|
|
|
static void snd_rpi_chipdip_dac_gpio_array_set(int value); |
|
static void snd_rpi_chipdip_dac_gpio_set(struct gpio_desc *gpio_item, int value); |
|
|
|
static void snd_rpi_chipdip_dac_gpio_array_set(int value) |
|
{ |
|
int i = 0; |
|
|
|
for (i = 0; i < HW_PARAMS_GPIO_COUNT; i++) |
|
snd_rpi_chipdip_dac_gpio_set(hw_params_gpios[i], ((value >> i) & 1)); |
|
} |
|
|
|
static void snd_rpi_chipdip_dac_gpio_set(struct gpio_desc *gpio_item, int value) |
|
{ |
|
if (gpio_item) |
|
gpiod_set_value_cansleep(gpio_item, value); |
|
} |
|
|
|
static int snd_rpi_chipdip_dac_init(struct snd_soc_pcm_runtime *rtd) |
|
{ |
|
return 0; |
|
} |
|
|
|
static int snd_rpi_chipdip_dac_hw_params(struct snd_pcm_substream *substream, |
|
struct snd_pcm_hw_params *params) |
|
{ |
|
int ret = 0; |
|
int gpio_change_pending = 0; |
|
int sample_rate_state = 0; |
|
int bit_depth_state = 0; |
|
int param_value = params_width(params); |
|
struct snd_soc_pcm_runtime *rtd = substream->private_data; |
|
|
|
ret = snd_soc_dai_set_bclk_ratio(asoc_rtd_to_cpu(rtd, 0), 2 * 32); |
|
|
|
if (current_width != param_value) { |
|
current_width = param_value; |
|
gpio_change_pending = 1; |
|
|
|
switch (param_value) { |
|
case 16: |
|
bit_depth_state = BIT_DEPTH_MASK_16; |
|
break; |
|
case 24: |
|
bit_depth_state = BIT_DEPTH_MASK_24; |
|
break; |
|
case 32: |
|
bit_depth_state = BIT_DEPTH_MASK_32; |
|
break; |
|
default: |
|
return -EINVAL; |
|
} |
|
} |
|
|
|
param_value = params_rate(params); |
|
if (current_rate != param_value) { |
|
current_rate = param_value; |
|
gpio_change_pending = 1; |
|
|
|
switch (param_value) { |
|
case 44100: |
|
sample_rate_state = SAMPLE_RATE_MASK_44_1; |
|
break; |
|
case 48000: |
|
sample_rate_state = SAMPLE_RATE_MASK_48; |
|
break; |
|
case 88200: |
|
sample_rate_state = SAMPLE_RATE_MASK_88_2; |
|
break; |
|
case 96000: |
|
sample_rate_state = SAMPLE_RATE_MASK_96; |
|
break; |
|
case 176400: |
|
sample_rate_state = SAMPLE_RATE_MASK_176_4; |
|
break; |
|
case 192000: |
|
sample_rate_state = SAMPLE_RATE_MASK_192; |
|
break; |
|
default: |
|
return -EINVAL; |
|
} |
|
} |
|
|
|
if (gpio_change_pending) { |
|
snd_rpi_chipdip_dac_gpio_set(mute_gpio, MUTE_ACTIVE); |
|
snd_rpi_chipdip_dac_gpio_array_set(bit_depth_state | sample_rate_state); |
|
msleep(300); |
|
snd_rpi_chipdip_dac_gpio_set(mute_gpio, MUTE_NOT_ACTIVE); |
|
} |
|
|
|
return ret; |
|
} |
|
|
|
static int snd_rpi_chipdip_dac_startup(struct snd_pcm_substream *substream) |
|
{ |
|
return 0; |
|
} |
|
|
|
static void snd_rpi_chipdip_dac_shutdown(struct snd_pcm_substream *substream) |
|
{ |
|
|
|
} |
|
|
|
/* machine stream operations */ |
|
static struct snd_soc_ops snd_rpi_chipdip_dac_ops = { |
|
.hw_params = snd_rpi_chipdip_dac_hw_params, |
|
.startup = snd_rpi_chipdip_dac_startup, |
|
.shutdown = snd_rpi_chipdip_dac_shutdown, |
|
}; |
|
|
|
SND_SOC_DAILINK_DEFS(hifi, |
|
DAILINK_COMP_ARRAY(COMP_CPU("bcm2708-i2s.0")), |
|
DAILINK_COMP_ARRAY(COMP_CODEC("spdif-transmitter", "dit-hifi")), |
|
DAILINK_COMP_ARRAY(COMP_PLATFORM("bcm2708-i2s.0"))); |
|
|
|
static struct snd_soc_dai_link snd_rpi_chipdip_dac_dai[] = { |
|
{ |
|
.name = "ChipDip DAC", |
|
.stream_name = "ChipDip DAC HiFi", |
|
.dai_fmt = SND_SOC_DAIFMT_I2S | SND_SOC_DAIFMT_NB_NF | |
|
SND_SOC_DAIFMT_CBM_CFM, |
|
.ops = &snd_rpi_chipdip_dac_ops, |
|
.init = snd_rpi_chipdip_dac_init, |
|
SND_SOC_DAILINK_REG(hifi), |
|
}, |
|
}; |
|
|
|
/* audio machine driver */ |
|
static struct snd_soc_card snd_rpi_chipdip_dac = { |
|
.name = "ChipDipDAC", |
|
.driver_name = "ChipdipDac", |
|
.owner = THIS_MODULE, |
|
.dai_link = snd_rpi_chipdip_dac_dai, |
|
.num_links = ARRAY_SIZE(snd_rpi_chipdip_dac_dai), |
|
}; |
|
|
|
static int snd_rpi_chipdip_dac_probe(struct platform_device *pdev) |
|
{ |
|
int ret = 0; |
|
int i = 0; |
|
|
|
snd_rpi_chipdip_dac.dev = &pdev->dev; |
|
|
|
if (pdev->dev.of_node) { |
|
struct device_node *i2s_node; |
|
struct snd_soc_dai_link *dai = &snd_rpi_chipdip_dac_dai[0]; |
|
i2s_node = of_parse_phandle(pdev->dev.of_node, |
|
"i2s-controller", 0); |
|
|
|
if (i2s_node) { |
|
dai->cpus->dai_name = NULL; |
|
dai->cpus->of_node = i2s_node; |
|
dai->platforms->name = NULL; |
|
dai->platforms->of_node = i2s_node; |
|
} |
|
} |
|
|
|
hw_params_gpios[SR_BIT_0] = devm_gpiod_get_optional(&pdev->dev, "sr0", GPIOD_OUT_LOW); |
|
hw_params_gpios[SR_BIT_1] = devm_gpiod_get_optional(&pdev->dev, "sr1", GPIOD_OUT_LOW); |
|
hw_params_gpios[SR_BIT_2] = devm_gpiod_get_optional(&pdev->dev, "sr2", GPIOD_OUT_LOW); |
|
hw_params_gpios[BD_BIT_0] = devm_gpiod_get_optional(&pdev->dev, "res0", GPIOD_OUT_LOW); |
|
hw_params_gpios[BD_BIT_1] = devm_gpiod_get_optional(&pdev->dev, "res1", GPIOD_OUT_LOW); |
|
mute_gpio = devm_gpiod_get_optional(&pdev->dev, "mute", GPIOD_OUT_LOW); |
|
sdwn_gpio = devm_gpiod_get_optional(&pdev->dev, "sdwn", GPIOD_OUT_HIGH); |
|
|
|
for (i = 0; i < HW_PARAMS_GPIO_COUNT; i++) { |
|
if (IS_ERR(hw_params_gpios[i])) { |
|
ret = PTR_ERR(hw_params_gpios[i]); |
|
dev_err(&pdev->dev, "failed to get hw_params gpio: %d\n", ret); |
|
return ret; |
|
} |
|
} |
|
|
|
if (IS_ERR(mute_gpio)) { |
|
ret = PTR_ERR(mute_gpio); |
|
dev_err(&pdev->dev, "failed to get mute gpio: %d\n", ret); |
|
return ret; |
|
} |
|
|
|
if (IS_ERR(sdwn_gpio)) { |
|
ret = PTR_ERR(sdwn_gpio); |
|
dev_err(&pdev->dev, "failed to get sdwn gpio: %d\n", ret); |
|
return ret; |
|
} |
|
|
|
snd_rpi_chipdip_dac_gpio_set(sdwn_gpio, 1); |
|
|
|
ret = devm_snd_soc_register_card(&pdev->dev, &snd_rpi_chipdip_dac); |
|
if (ret && ret != -EPROBE_DEFER) |
|
dev_err(&pdev->dev, |
|
"snd_soc_register_card() failed: %d\n", ret); |
|
|
|
return ret; |
|
} |
|
|
|
static const struct of_device_id snd_rpi_chipdip_dac_of_match[] = { |
|
{ .compatible = "chipdip,chipdip-dac", }, |
|
{}, |
|
}; |
|
MODULE_DEVICE_TABLE(of, snd_rpi_chipdip_dac_of_match); |
|
|
|
static struct platform_driver snd_rpi_chipdip_dac_driver = { |
|
.driver = { |
|
.name = "snd-rpi-chipdip-dac", |
|
.owner = THIS_MODULE, |
|
.of_match_table = snd_rpi_chipdip_dac_of_match, |
|
}, |
|
.probe = snd_rpi_chipdip_dac_probe, |
|
}; |
|
|
|
module_platform_driver(snd_rpi_chipdip_dac_driver); |
|
|
|
MODULE_AUTHOR("Evgenij Sapunov <[email protected]>"); |
|
MODULE_DESCRIPTION("ASoC Driver for ChipDip DAC"); |
|
MODULE_LICENSE("GPL v2");
|
|
|