104 lines
2.9 KiB
C
104 lines
2.9 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* Cirrus Logic CS42448/CS42888 Audio CODEC DAI SPI driver
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*
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* Copyright 2026 NXP
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*
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*/
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#include <linux/module.h>
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#include <linux/pm_runtime.h>
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#include <linux/regmap.h>
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#include <linux/spi/spi.h>
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#include <sound/soc.h>
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#include "cs42xx8.h"
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/*
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* CS42448/CS42888 SPI register access (from datasheet Figure 23):
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*
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* The SPI frame is 3 bytes:
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* Byte 0: chip address [7:1] = 1001111, bit[0] = R/W (0=write, 1=read)
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* Write: 0x9E, Read: 0x9F
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* Byte 1: MAP - Memory Address Pointer
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* bit[7] = INCR (auto-increment for burst), bits[6:0] = address
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* Byte 2: data byte
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*
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* We configure reg_bits=16 so that regmap treats the address field as 2 bytes
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* (big-endian). The chip address byte (0x9E/0x9F) is placed in the high byte
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* via write_flag_mask / read_flag_mask, and the MAP register address occupies
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* the low byte. Currently INCR (MAP bit[7]) is not set and use_single_read/write
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* are enabled. This produces the correct 3-byte on-wire frame without any
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* custom bus implementation:
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*
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* write: [0x9E, MAP_addr, data]
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* read: [0x9F, MAP_addr] -> [data]
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*/
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static int cs42xx8_spi_probe(struct spi_device *spi)
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{
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struct cs42xx8_driver_data *drvdata;
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struct regmap_config config;
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int ret;
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drvdata = (struct cs42xx8_driver_data *)spi_get_device_match_data(spi);
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if (!drvdata)
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return dev_err_probe(&spi->dev, -EINVAL,
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"failed to find driver data\n");
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config = cs42xx8_regmap_config;
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/*
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* reg_bits=16 makes regmap send a 2-byte address field (big-endian).
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* write_flag_mask/read_flag_mask are OR'd into that address field:
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*/
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config.reg_bits = 16;
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config.write_flag_mask = 0x9E;
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config.read_flag_mask = 0x9F;
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ret = cs42xx8_probe(&spi->dev,
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devm_regmap_init_spi(spi, &config), drvdata);
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if (ret)
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return ret;
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pm_runtime_enable(&spi->dev);
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pm_request_idle(&spi->dev);
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return 0;
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}
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static void cs42xx8_spi_remove(struct spi_device *spi)
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{
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pm_runtime_disable(&spi->dev);
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}
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static const struct of_device_id cs42xx8_of_match[] = {
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{ .compatible = "cirrus,cs42448", .data = &cs42448_data, },
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{ .compatible = "cirrus,cs42888", .data = &cs42888_data, },
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{ /* sentinel */ }
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};
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MODULE_DEVICE_TABLE(of, cs42xx8_of_match);
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static const struct spi_device_id cs42xx8_spi_id[] = {
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{ .name = "cs42448", .driver_data = (kernel_ulong_t)&cs42448_data },
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{ .name = "cs42888", .driver_data = (kernel_ulong_t)&cs42888_data },
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{ }
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};
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MODULE_DEVICE_TABLE(spi, cs42xx8_spi_id);
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static struct spi_driver cs42xx8_spi_driver = {
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.driver = {
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.name = "cs42xx8",
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.pm = pm_ptr(&cs42xx8_pm),
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.of_match_table = cs42xx8_of_match,
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},
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.probe = cs42xx8_spi_probe,
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.remove = cs42xx8_spi_remove,
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.id_table = cs42xx8_spi_id,
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};
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module_spi_driver(cs42xx8_spi_driver);
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MODULE_DESCRIPTION("Cirrus Logic CS42448/CS42888 ALSA SoC Codec SPI Driver");
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MODULE_AUTHOR("Chancel Liu <chancel.liu@nxp.com>");
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MODULE_LICENSE("GPL");
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