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This patch adds support for the 8 channel PDM-to-I2S/TDM converter. The ADAU7118 converts four stereo pulse density modulation (PDM) bitstreams into one pulse code modulation (PCM) output stream. The source for the PDM data can be eight microphones or other PDM sources. The PCM audio data is output on a serial audio interface port in either inter-IC serial (I2S) or time domain multiplexed (TDM) format. Signed-off-by: Nuno Sá <nuno.sa@analog.com> Link: https://lore.kernel.org/r/20191010074234.7344-1-nuno.sa@analog.com Signed-off-by: Mark Brown <broonie@kernel.org>
83 lines
2.2 KiB
C
83 lines
2.2 KiB
C
// SPDX-License-Identifier: GPL-2.0
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//
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// Analog Devices ADAU7118 8 channel PDM-to-I2S/TDM Converter driver over I2C
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//
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// Copyright 2019 Analog Devices Inc.
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#include <linux/i2c.h>
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#include <linux/module.h>
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#include <linux/regmap.h>
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#include "adau7118.h"
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static const struct reg_default adau7118_reg_defaults[] = {
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{ ADAU7118_REG_VENDOR_ID, 0x41 },
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{ ADAU7118_REG_DEVICE_ID1, 0x71 },
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{ ADAU7118_REG_DEVICE_ID2, 0x18 },
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{ ADAU7118_REG_REVISION_ID, 0x00 },
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{ ADAU7118_REG_ENABLES, 0x3F },
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{ ADAU7118_REG_DEC_RATIO_CLK_MAP, 0xC0 },
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{ ADAU7118_REG_HPF_CONTROL, 0xD0 },
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{ ADAU7118_REG_SPT_CTRL1, 0x41 },
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{ ADAU7118_REG_SPT_CTRL2, 0x00 },
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{ ADAU7118_REG_SPT_CX(0), 0x01 },
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{ ADAU7118_REG_SPT_CX(1), 0x11 },
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{ ADAU7118_REG_SPT_CX(2), 0x21 },
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{ ADAU7118_REG_SPT_CX(3), 0x31 },
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{ ADAU7118_REG_SPT_CX(4), 0x41 },
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{ ADAU7118_REG_SPT_CX(5), 0x51 },
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{ ADAU7118_REG_SPT_CX(6), 0x61 },
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{ ADAU7118_REG_SPT_CX(7), 0x71 },
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{ ADAU7118_REG_DRIVE_STRENGTH, 0x2a },
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{ ADAU7118_REG_RESET, 0x00 },
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};
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static const struct regmap_config adau7118_regmap_config = {
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.reg_bits = 8,
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.val_bits = 8,
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.reg_defaults = adau7118_reg_defaults,
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.num_reg_defaults = ARRAY_SIZE(adau7118_reg_defaults),
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.cache_type = REGCACHE_RBTREE,
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.max_register = ADAU7118_REG_RESET,
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};
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static int adau7118_probe_i2c(struct i2c_client *i2c,
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const struct i2c_device_id *id)
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{
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struct regmap *map;
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map = devm_regmap_init_i2c(i2c, &adau7118_regmap_config);
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if (IS_ERR(map)) {
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dev_err(&i2c->dev, "Failed to init regmap %ld\n", PTR_ERR(map));
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return PTR_ERR(map);
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}
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return adau7118_probe(&i2c->dev, map, false);
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}
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static const struct of_device_id adau7118_of_match[] = {
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{ .compatible = "adi,adau7118" },
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{}
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};
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MODULE_DEVICE_TABLE(of, adau7118_of_match);
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static const struct i2c_device_id adau7118_id[] = {
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{"adau7118", 0},
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{}
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};
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MODULE_DEVICE_TABLE(i2c, adau7118_id);
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static struct i2c_driver adau7118_driver = {
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.driver = {
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.name = "adau7118",
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.of_match_table = adau7118_of_match,
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},
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.probe = adau7118_probe_i2c,
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.id_table = adau7118_id,
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};
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module_i2c_driver(adau7118_driver);
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MODULE_AUTHOR("Nuno Sa <nuno.sa@analog.com>");
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MODULE_DESCRIPTION("ADAU7118 8 channel PDM-to-I2S/TDM Converter driver over I2C");
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MODULE_LICENSE("GPL");
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