mfd: madera: Add common support for Cirrus Logic Madera codecs

This adds the generic core support for Cirrus Logic "Madera" class codecs.
These are complex audio codec SoCs with a variety of digital and analogue
I/O, onboard audio processing and DSPs, and other features.

These codecs are all based off a common set of hardware IP so can be
supported by a core of common code (with a few minor device-to-device
variations).

Signed-off-by: Charles Keepax <ckeepax@opensource.cirrus.com>
Signed-off-by: Nikesh Oswal <Nikesh.Oswal@cirrus.com>
Signed-off-by: Richard Fitzgerald <rf@opensource.cirrus.com>
Signed-off-by: Lee Jones <lee.jones@linaro.org>

1 files changed, 139 insertions, 0 deletions

diff --git a/drivers/mfd/madera-spi.c b/drivers/mfd/madera-spi.c
new file mode 100644
index 000000000000..4c398b278bba
--- /dev/null
+++ b/drivers/mfd/madera-spi.c
@@ -0,0 +1,139 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * SPI bus interface to Cirrus Logic Madera codecs
+ *
+ * Copyright (C) 2015-2018 Cirrus Logic
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by the
+ * Free Software Foundation; version 2.
+ */
+
+#include <linux/device.h>
+#include <linux/err.h>
+#include <linux/module.h>
+#include <linux/of.h>
+#include <linux/of_device.h>
+#include <linux/regmap.h>
+#include <linux/spi/spi.h>
+
+#include <linux/mfd/madera/core.h>
+
+#include "madera.h"
+
+static int madera_spi_probe(struct spi_device *spi)
+{
+	const struct spi_device_id *id = spi_get_device_id(spi);
+	struct madera *madera;
+	const struct regmap_config *regmap_16bit_config = NULL;
+	const struct regmap_config *regmap_32bit_config = NULL;
+	const void *of_data;
+	unsigned long type;
+	const char *name;
+	int ret;
+
+	of_data = of_device_get_match_data(&spi->dev);
+	if (of_data)
+		type = (unsigned long)of_data;
+	else
+		type = id->driver_data;
+
+	switch (type) {
+	case CS47L35:
+		if (IS_ENABLED(CONFIG_MFD_CS47L35)) {
+			regmap_16bit_config = &cs47l35_16bit_spi_regmap;
+			regmap_32bit_config = &cs47l35_32bit_spi_regmap;
+		}
+		break;
+	case CS47L85:
+	case WM1840:
+		if (IS_ENABLED(CONFIG_MFD_CS47L85)) {
+			regmap_16bit_config = &cs47l85_16bit_spi_regmap;
+			regmap_32bit_config = &cs47l85_32bit_spi_regmap;
+		}
+		break;
+	case CS47L90:
+	case CS47L91:
+		if (IS_ENABLED(CONFIG_MFD_CS47L90)) {
+			regmap_16bit_config = &cs47l90_16bit_spi_regmap;
+			regmap_32bit_config = &cs47l90_32bit_spi_regmap;
+		}
+		break;
+	default:
+		dev_err(&spi->dev,
+			"Unknown Madera SPI device type %ld\n", type);
+		return -EINVAL;
+	}
+
+	name = madera_name_from_type(type);
+
+	if (!regmap_16bit_config) {
+		/* it's polite to say which codec isn't built into the kernel */
+		dev_err(&spi->dev,
+			"Kernel does not include support for %s\n", name);
+		return -EINVAL;
+	}
+
+	madera = devm_kzalloc(&spi->dev, sizeof(*madera), GFP_KERNEL);
+	if (!madera)
+		return -ENOMEM;
+
+	madera->regmap = devm_regmap_init_spi(spi, regmap_16bit_config);
+	if (IS_ERR(madera->regmap)) {
+		ret = PTR_ERR(madera->regmap);
+		dev_err(&spi->dev,
+			"Failed to allocate 16-bit register map: %d\n",	ret);
+		return ret;
+	}
+
+	madera->regmap_32bit = devm_regmap_init_spi(spi, regmap_32bit_config);
+	if (IS_ERR(madera->regmap_32bit)) {
+		ret = PTR_ERR(madera->regmap_32bit);
+		dev_err(&spi->dev,
+			"Failed to allocate 32-bit register map: %d\n",	ret);
+		return ret;
+	}
+
+	madera->type = type;
+	madera->type_name = name;
+	madera->dev = &spi->dev;
+	madera->irq = spi->irq;
+
+	return madera_dev_init(madera);
+}
+
+static int madera_spi_remove(struct spi_device *spi)
+{
+	struct madera *madera = spi_get_drvdata(spi);
+
+	madera_dev_exit(madera);
+
+	return 0;
+}
+
+static const struct spi_device_id madera_spi_ids[] = {
+	{ "cs47l35", CS47L35 },
+	{ "cs47l85", CS47L85 },
+	{ "cs47l90", CS47L90 },
+	{ "cs47l91", CS47L91 },
+	{ "wm1840", WM1840 },
+	{ }
+};
+MODULE_DEVICE_TABLE(spi, madera_spi_ids);
+
+static struct spi_driver madera_spi_driver = {
+	.driver = {
+		.name	= "madera",
+		.pm	= &madera_pm_ops,
+		.of_match_table	= of_match_ptr(madera_of_match),
+	},
+	.probe		= madera_spi_probe,
+	.remove		= madera_spi_remove,
+	.id_table	= madera_spi_ids,
+};
+
+module_spi_driver(madera_spi_driver);
+
+MODULE_DESCRIPTION("Madera SPI bus interface");
+MODULE_AUTHOR("Richard Fitzgerald <rf@opensource.cirrus.com>");
+MODULE_LICENSE("GPL v2");