snd-soc-cs4271-spi-y := cs4271-spi.o
snd-soc-cs42xx8-y := cs42xx8.o
snd-soc-cs42xx8-i2c-y := cs42xx8-i2c.o
+snd-soc-cs42xx8-spi-y := cs42xx8-spi.o
snd-soc-cs43130-y := cs43130.o
snd-soc-cs4341-y := cs4341.o
snd-soc-cs4349-y := cs4349.o
obj-$(CONFIG_SND_SOC_CS4271_SPI) += snd-soc-cs4271-spi.o
obj-$(CONFIG_SND_SOC_CS42XX8) += snd-soc-cs42xx8.o
obj-$(CONFIG_SND_SOC_CS42XX8_I2C) += snd-soc-cs42xx8-i2c.o
+obj-$(CONFIG_SND_SOC_CS42XX8_SPI) += snd-soc-cs42xx8-spi.o
obj-$(CONFIG_SND_SOC_CS43130) += snd-soc-cs43130.o
obj-$(CONFIG_SND_SOC_CS4341) += snd-soc-cs4341.o
obj-$(CONFIG_SND_SOC_CS4349) += snd-soc-cs4349.o
--- /dev/null
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Cirrus Logic CS42448/CS42888 Audio CODEC DAI SPI driver
+ *
+ * Copyright 2026 NXP
+ *
+ */
+
+#include <linux/mod_devicetable.h>
+#include <linux/module.h>
+#include <linux/pm_runtime.h>
+#include <linux/regmap.h>
+#include <linux/spi/spi.h>
+#include <sound/soc.h>
+
+#include "cs42xx8.h"
+
+/*
+ * CS42448/CS42888 SPI register access (from datasheet Figure 23):
+ *
+ * The SPI frame is 3 bytes:
+ * Byte 0: chip address [7:1] = 1001111, bit[0] = R/W (0=write, 1=read)
+ * Write: 0x9E, Read: 0x9F
+ * Byte 1: MAP - Memory Address Pointer
+ * bit[7] = INCR (auto-increment for burst), bits[6:0] = address
+ * Byte 2: data byte
+ *
+ * We configure reg_bits=16 so that regmap treats the address field as 2 bytes
+ * (big-endian). The chip address byte (0x9E/0x9F) is placed in the high byte
+ * via write_flag_mask / read_flag_mask, and the MAP register address occupies
+ * the low byte. Currently INCR (MAP bit[7]) is not set and use_single_read/write
+ * are enabled. This produces the correct 3-byte on-wire frame without any
+ * custom bus implementation:
+ *
+ * write: [0x9E, MAP_addr, data]
+ * read: [0x9F, MAP_addr] -> [data]
+ */
+
+static int cs42xx8_spi_probe(struct spi_device *spi)
+{
+ struct cs42xx8_driver_data *drvdata;
+ struct regmap_config config;
+ int ret;
+
+ drvdata = (struct cs42xx8_driver_data *)spi_get_device_match_data(spi);
+ if (!drvdata)
+ return dev_err_probe(&spi->dev, -EINVAL,
+ "failed to find driver data\n");
+
+ config = cs42xx8_regmap_config;
+ /*
+ * reg_bits=16 makes regmap send a 2-byte address field (big-endian).
+ * write_flag_mask/read_flag_mask are OR'd into that address field:
+ */
+ config.reg_bits = 16;
+ config.write_flag_mask = 0x9E;
+ config.read_flag_mask = 0x9F;
+
+ ret = cs42xx8_probe(&spi->dev,
+ devm_regmap_init_spi(spi, &config), drvdata);
+ if (ret)
+ return ret;
+
+ pm_runtime_enable(&spi->dev);
+ pm_request_idle(&spi->dev);
+
+ return 0;
+}
+
+static void cs42xx8_spi_remove(struct spi_device *spi)
+{
+ pm_runtime_disable(&spi->dev);
+}
+
+static const struct of_device_id cs42xx8_of_match[] = {
+ { .compatible = "cirrus,cs42448", .data = &cs42448_data, },
+ { .compatible = "cirrus,cs42888", .data = &cs42888_data, },
+ { /* sentinel */ }
+};
+MODULE_DEVICE_TABLE(of, cs42xx8_of_match);
+
+static const struct spi_device_id cs42xx8_spi_id[] = {
+ { .name = "cs42448", .driver_data = (kernel_ulong_t)&cs42448_data },
+ { .name = "cs42888", .driver_data = (kernel_ulong_t)&cs42888_data },
+ { }
+};
+MODULE_DEVICE_TABLE(spi, cs42xx8_spi_id);
+
+static struct spi_driver cs42xx8_spi_driver = {
+ .driver = {
+ .name = "cs42xx8",
+ .pm = pm_ptr(&cs42xx8_pm),
+ .of_match_table = cs42xx8_of_match,
+ },
+ .probe = cs42xx8_spi_probe,
+ .remove = cs42xx8_spi_remove,
+ .id_table = cs42xx8_spi_id,
+};
+
+module_spi_driver(cs42xx8_spi_driver);
+
+MODULE_DESCRIPTION("Cirrus Logic CS42448/CS42888 ALSA SoC Codec SPI Driver");
+MODULE_AUTHOR("Chancel Liu <chancel.liu@nxp.com>");
+MODULE_LICENSE("GPL");
projects / thirdparty / kernel / stable.git / commitdiff
