Commit 16b27467 authored by Richard Fitzgerald's avatar Richard Fitzgerald Committed by Lee Jones
Browse files

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: default avatarCharles Keepax <ckeepax@opensource.cirrus.com>
Signed-off-by: default avatarNikesh Oswal <Nikesh.Oswal@cirrus.com>
Signed-off-by: default avatarRichard Fitzgerald <rf@opensource.cirrus.com>
Signed-off-by: default avatarLee Jones <lee.jones@linaro.org>
parent 2b49088c

MAINTAINERS

+3 −0
Original line number Diff line number Diff line
@@ -3487,7 +3487,10 @@ L: patches@opensource.cirrus.com 
T:	git https://github.com/CirrusLogic/linux-drivers.git

W:	https://github.com/CirrusLogic/linux-drivers/wiki

S:	Supported

F:	Documentation/devicetree/bindings/mfd/madera.txt

F:	include/linux/mfd/madera/*

F:	drivers/mfd/madera*

F:	drivers/mfd/cs47l*



CLEANCACHE API

M:	Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>

drivers/mfd/Kconfig

+29 −0
Original line number Diff line number Diff line
@@ -232,6 +232,35 @@ config MFD_CROS_EC_CHARDEV 
          If you have a supported Chromebook, choose Y or M here.

          The module will be called cros_ec_dev.



config MFD_MADERA

	tristate "Cirrus Logic Madera codecs"

	select MFD_CORE

	select REGMAP

	select REGMAP_IRQ

	select MADERA_IRQ

	select PINCTRL

	select PINCTRL_MADERA

	help

	  Support for the Cirrus Logic Madera platform audio codecs



config MFD_MADERA_I2C

	tristate "Cirrus Logic Madera codecs with I2C"

	depends on MFD_MADERA

	depends on I2C

	select REGMAP_I2C

	help

	  Support for the Cirrus Logic Madera platform audio SoC

	  core functionality controlled via I2C.



config MFD_MADERA_SPI

	tristate "Cirrus Logic Madera codecs with SPI"

	depends on MFD_MADERA

	depends on SPI_MASTER

	select REGMAP_SPI

	help

	  Support for the Cirrus Logic Madera platform audio SoC

	  core functionality controlled via SPI.



config MFD_ASIC3

	bool "Compaq ASIC3"

	depends on GPIOLIB && ARM

drivers/mfd/Makefile

+5 −0
Original line number Diff line number Diff line
@@ -73,6 +73,11 @@ wm8994-objs := wm8994-core.o wm8994-irq.o wm8994-regmap.o 
obj-$(CONFIG_MFD_WM8994)	+= wm8994.o

obj-$(CONFIG_MFD_WM97xx)	+= wm97xx-core.o



madera-objs			:= madera-core.o

obj-$(CONFIG_MFD_MADERA)	+= madera.o

obj-$(CONFIG_MFD_MADERA_I2C)	+= madera-i2c.o

obj-$(CONFIG_MFD_MADERA_SPI)	+= madera-spi.o



obj-$(CONFIG_TPS6105X)		+= tps6105x.o

obj-$(CONFIG_TPS65010)		+= tps65010.o

obj-$(CONFIG_TPS6507X)		+= tps6507x.o

drivers/mfd/madera-core.c

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// SPDX-License-Identifier: GPL-2.0

/*

 * Core MFD support for 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/delay.h>

#include <linux/err.h>

#include <linux/gpio.h>

#include <linux/mfd/core.h>

#include <linux/module.h>

#include <linux/notifier.h>

#include <linux/of.h>

#include <linux/of_gpio.h>

#include <linux/platform_device.h>

#include <linux/pm_runtime.h>

#include <linux/regmap.h>

#include <linux/regulator/consumer.h>

#include <linux/regulator/machine.h>

#include <linux/regulator/of_regulator.h>



#include <linux/mfd/madera/core.h>

#include <linux/mfd/madera/registers.h>



#include "madera.h"



#define CS47L35_SILICON_ID	0x6360

#define CS47L85_SILICON_ID	0x6338

#define CS47L90_SILICON_ID	0x6364



#define MADERA_32KZ_MCLK2	1



static const char * const madera_core_supplies[] = {

	"AVDD",

	"DBVDD1",

};



static const struct mfd_cell madera_ldo1_devs[] = {

	{ .name = "madera-ldo1" },

};



static const char * const cs47l35_supplies[] = {

	"MICVDD",

	"DBVDD2",

	"CPVDD1",

	"CPVDD2",

	"SPKVDD",

};



static const struct mfd_cell cs47l35_devs[] = {

	{ .name = "madera-pinctrl", },

	{ .name = "madera-irq", },

	{ .name = "madera-micsupp", },

	{ .name = "madera-gpio", },

	{ .name = "madera-extcon", },

	{

		.name = "cs47l35-codec",

		.parent_supplies = cs47l35_supplies,

		.num_parent_supplies = ARRAY_SIZE(cs47l35_supplies),

	},

};



static const char * const cs47l85_supplies[] = {

	"MICVDD",

	"DBVDD2",

	"DBVDD3",

	"DBVDD4",

	"CPVDD1",

	"CPVDD2",

	"SPKVDDL",

	"SPKVDDR",

};



static const struct mfd_cell cs47l85_devs[] = {

	{ .name = "madera-pinctrl", },

	{ .name = "madera-irq", },

	{ .name = "madera-micsupp" },

	{ .name = "madera-gpio", },

	{ .name = "madera-extcon", },

	{

		.name = "cs47l85-codec",

		.parent_supplies = cs47l85_supplies,

		.num_parent_supplies = ARRAY_SIZE(cs47l85_supplies),

	},

};



static const char * const cs47l90_supplies[] = {

	"MICVDD",

	"DBVDD2",

	"DBVDD3",

	"DBVDD4",

	"CPVDD1",

	"CPVDD2",

};



static const struct mfd_cell cs47l90_devs[] = {

	{ .name = "madera-pinctrl", },

	{ .name = "madera-irq", },

	{ .name = "madera-micsupp", },

	{ .name = "madera-gpio", },

	{ .name = "madera-extcon", },

	{

		.name = "cs47l90-codec",

		.parent_supplies = cs47l90_supplies,

		.num_parent_supplies = ARRAY_SIZE(cs47l90_supplies),

	},

};



/* Used by madera-i2c and madera-spi drivers */

const char *madera_name_from_type(enum madera_type type)

{

	switch (type) {

	case CS47L35:

		return "CS47L35";

	case CS47L85:

		return "CS47L85";

	case CS47L90:

		return "CS47L90";

	case CS47L91:

		return "CS47L91";

	case WM1840:

		return "WM1840";

	default:

		return "Unknown";

	}

}

EXPORT_SYMBOL_GPL(madera_name_from_type);



#define MADERA_BOOT_POLL_MAX_INTERVAL_US  5000

#define MADERA_BOOT_POLL_TIMEOUT_US	 25000



static int madera_wait_for_boot(struct madera *madera)

{

	unsigned int val;

	int ret;



	/*

	 * We can't use an interrupt as we need to runtime resume to do so,

	 * so we poll the status bit. This won't race with the interrupt

	 * handler because it will be blocked on runtime resume.

	 */

	ret = regmap_read_poll_timeout(madera->regmap,

				       MADERA_IRQ1_RAW_STATUS_1,

				       val,

				       (val & MADERA_BOOT_DONE_STS1),

				       MADERA_BOOT_POLL_MAX_INTERVAL_US,

				       MADERA_BOOT_POLL_TIMEOUT_US);



	if (ret)

		dev_err(madera->dev, "Polling BOOT_DONE_STS failed: %d\n", ret);



	/*

	 * BOOT_DONE defaults to unmasked on boot so we must ack it.

	 * Do this unconditionally to avoid interrupt storms.

	 */

	regmap_write(madera->regmap, MADERA_IRQ1_STATUS_1,

		     MADERA_BOOT_DONE_EINT1);



	pm_runtime_mark_last_busy(madera->dev);



	return ret;

}



static int madera_soft_reset(struct madera *madera)

{

	int ret;



	ret = regmap_write(madera->regmap, MADERA_SOFTWARE_RESET, 0);

	if (ret != 0) {

		dev_err(madera->dev, "Failed to soft reset device: %d\n", ret);

		return ret;

	}



	/* Allow time for internal clocks to startup after reset */

	usleep_range(1000, 2000);



	return 0;

}



static void madera_enable_hard_reset(struct madera *madera)

{

	if (!madera->pdata.reset)

		return;



	/*

	 * There are many existing out-of-tree users of these codecs that we

	 * can't break so preserve the expected behaviour of setting the line

	 * low to assert reset.

	 */

	gpiod_set_raw_value_cansleep(madera->pdata.reset, 0);

}



static void madera_disable_hard_reset(struct madera *madera)

{

	if (!madera->pdata.reset)

		return;



	gpiod_set_raw_value_cansleep(madera->pdata.reset, 1);

	usleep_range(1000, 2000);

}



static int __maybe_unused madera_runtime_resume(struct device *dev)

{

	struct madera *madera = dev_get_drvdata(dev);

	int ret;



	dev_dbg(dev, "Leaving sleep mode\n");



	ret = regulator_enable(madera->dcvdd);

	if (ret) {

		dev_err(dev, "Failed to enable DCVDD: %d\n", ret);

		return ret;

	}



	regcache_cache_only(madera->regmap, false);

	regcache_cache_only(madera->regmap_32bit, false);



	ret = madera_wait_for_boot(madera);

	if (ret)

		goto err;



	ret = regcache_sync(madera->regmap);

	if (ret) {

		dev_err(dev, "Failed to restore 16-bit register cache\n");

		goto err;

	}



	ret = regcache_sync(madera->regmap_32bit);

	if (ret) {

		dev_err(dev, "Failed to restore 32-bit register cache\n");

		goto err;

	}



	return 0;



err:

	regcache_cache_only(madera->regmap_32bit, true);

	regcache_cache_only(madera->regmap, true);

	regulator_disable(madera->dcvdd);



	return ret;

}



static int __maybe_unused madera_runtime_suspend(struct device *dev)

{

	struct madera *madera = dev_get_drvdata(dev);



	dev_dbg(madera->dev, "Entering sleep mode\n");



	regcache_cache_only(madera->regmap, true);

	regcache_mark_dirty(madera->regmap);

	regcache_cache_only(madera->regmap_32bit, true);

	regcache_mark_dirty(madera->regmap_32bit);



	regulator_disable(madera->dcvdd);



	return 0;

}



const struct dev_pm_ops madera_pm_ops = {

	SET_RUNTIME_PM_OPS(madera_runtime_suspend,

			   madera_runtime_resume,

			   NULL)

};

EXPORT_SYMBOL_GPL(madera_pm_ops);



const struct of_device_id madera_of_match[] = {

	{ .compatible = "cirrus,cs47l35", .data = (void *)CS47L35 },

	{ .compatible = "cirrus,cs47l85", .data = (void *)CS47L85 },

	{ .compatible = "cirrus,cs47l90", .data = (void *)CS47L90 },

	{ .compatible = "cirrus,cs47l91", .data = (void *)CS47L91 },

	{ .compatible = "cirrus,wm1840", .data = (void *)WM1840 },

	{}

};

EXPORT_SYMBOL_GPL(madera_of_match);



static int madera_get_reset_gpio(struct madera *madera)

{

	struct gpio_desc *reset;

	int ret;



	if (madera->pdata.reset)

		return 0;



	reset = devm_gpiod_get_optional(madera->dev, "reset", GPIOD_OUT_LOW);

	if (IS_ERR(reset)) {

		ret = PTR_ERR(reset);

		if (ret != -EPROBE_DEFER)

			dev_err(madera->dev, "Failed to request /RESET: %d\n",

				ret);

		return ret;

	}



	/*

	 * A hard reset is needed for full reset of the chip. We allow running

	 * without hard reset only because it can be useful for early

	 * prototyping and some debugging, but we need to warn it's not ideal.

	 */

	if (!reset)

		dev_warn(madera->dev,

			 "Running without reset GPIO is not recommended\n");



	madera->pdata.reset = reset;



	return 0;

}



static void madera_set_micbias_info(struct madera *madera)

{

	/*

	 * num_childbias is an array because future codecs can have different

	 * childbiases for each micbias. Unspecified values default to 0.

	 */

	switch (madera->type) {

	case CS47L35:

		madera->num_micbias = 2;

		madera->num_childbias[0] = 2;

		madera->num_childbias[1] = 2;

		return;

	case CS47L85:

	case WM1840:

		madera->num_micbias = 4;

		/* no child biases */

		return;

	case CS47L90:

	case CS47L91:

		madera->num_micbias = 2;

		madera->num_childbias[0] = 4;

		madera->num_childbias[1] = 4;

		return;

	default:

		return;

	}

}



int madera_dev_init(struct madera *madera)

{

	struct device *dev = madera->dev;

	unsigned int hwid;

	int (*patch_fn)(struct madera *) = NULL;

	const struct mfd_cell *mfd_devs;

	int n_devs = 0;

	int i, ret;



	dev_set_drvdata(madera->dev, madera);

	BLOCKING_INIT_NOTIFIER_HEAD(&madera->notifier);

	madera_set_micbias_info(madera);



	/*

	 * We need writable hw config info that all children can share.

	 * Simplest to take one shared copy of pdata struct.

	 */

	if (dev_get_platdata(madera->dev)) {

		memcpy(&madera->pdata, dev_get_platdata(madera->dev),

		       sizeof(madera->pdata));

	}



	ret = madera_get_reset_gpio(madera);

	if (ret)

		return ret;



	regcache_cache_only(madera->regmap, true);

	regcache_cache_only(madera->regmap_32bit, true);



	for (i = 0; i < ARRAY_SIZE(madera_core_supplies); i++)

		madera->core_supplies[i].supply = madera_core_supplies[i];



	madera->num_core_supplies = ARRAY_SIZE(madera_core_supplies);



	/*

	 * On some codecs DCVDD could be supplied by the internal LDO1.

	 * For those we must add the LDO1 driver before requesting DCVDD

	 * No devm_ because we need to control shutdown order of children.

	 */

	switch (madera->type) {

	case CS47L35:

	case CS47L90:

	case CS47L91:

		break;

	case CS47L85:

	case WM1840:

		ret = mfd_add_devices(madera->dev, PLATFORM_DEVID_NONE,

				      madera_ldo1_devs,

				      ARRAY_SIZE(madera_ldo1_devs),

				      NULL, 0, NULL);

		if (ret) {

			dev_err(dev, "Failed to add LDO1 child: %d\n", ret);

			return ret;

		}

		break;

	default:

		/* No point continuing if the type is unknown */

		dev_err(madera->dev, "Unknown device type %d\n", madera->type);

		return -ENODEV;

	}



	ret = devm_regulator_bulk_get(dev, madera->num_core_supplies,

				      madera->core_supplies);

	if (ret) {

		dev_err(dev, "Failed to request core supplies: %d\n", ret);

		goto err_devs;

	}



	/*

	 * Don't use devres here. If the regulator is one of our children it

	 * will already have been removed before devres cleanup on this mfd

	 * driver tries to call put() on it. We need control of shutdown order.

	 */

	madera->dcvdd = regulator_get(madera->dev, "DCVDD");

	if (IS_ERR(madera->dcvdd)) {

		ret = PTR_ERR(madera->dcvdd);

		dev_err(dev, "Failed to request DCVDD: %d\n", ret);

		goto err_devs;

	}



	ret = regulator_bulk_enable(madera->num_core_supplies,

				    madera->core_supplies);

	if (ret) {

		dev_err(dev, "Failed to enable core supplies: %d\n", ret);

		goto err_dcvdd;

	}



	ret = regulator_enable(madera->dcvdd);

	if (ret) {

		dev_err(dev, "Failed to enable DCVDD: %d\n", ret);

		goto err_enable;

	}



	madera_disable_hard_reset(madera);



	regcache_cache_only(madera->regmap, false);

	regcache_cache_only(madera->regmap_32bit, false);



	/*

	 * Now we can power up and verify that this is a chip we know about

	 * before we start doing any writes to its registers.

	 */

	ret = regmap_read(madera->regmap, MADERA_SOFTWARE_RESET, &hwid);

	if (ret) {

		dev_err(dev, "Failed to read ID register: %d\n", ret);

		goto err_reset;

	}



	switch (hwid) {

	case CS47L35_SILICON_ID:

		if (IS_ENABLED(CONFIG_MFD_CS47L35)) {

			switch (madera->type) {

			case CS47L35:

				patch_fn = cs47l35_patch;

				mfd_devs = cs47l35_devs;

				n_devs = ARRAY_SIZE(cs47l35_devs);

				break;

			default:

				break;

			}

		}

		break;

	case CS47L85_SILICON_ID:

		if (IS_ENABLED(CONFIG_MFD_CS47L85)) {

			switch (madera->type) {

			case CS47L85:

			case WM1840:

				patch_fn = cs47l85_patch;

				mfd_devs = cs47l85_devs;

				n_devs = ARRAY_SIZE(cs47l85_devs);

				break;

			default:

				break;

			}

		}

		break;

	case CS47L90_SILICON_ID:

		if (IS_ENABLED(CONFIG_MFD_CS47L90)) {

			switch (madera->type) {

			case CS47L90:

			case CS47L91:

				patch_fn = cs47l90_patch;

				mfd_devs = cs47l90_devs;

				n_devs = ARRAY_SIZE(cs47l90_devs);

				break;

			default:

				break;

			}

		}

		break;

	default:

		dev_err(madera->dev, "Unknown device ID: %x\n", hwid);

		ret = -EINVAL;

		goto err_reset;

	}



	if (!n_devs) {

		dev_err(madera->dev, "Device ID 0x%x not a %s\n", hwid,

			madera->type_name);

		ret = -ENODEV;

		goto err_reset;

	}



	/*

	 * It looks like a device we support. If we don't have a hard reset

	 * we can now attempt a soft reset.

	 */

	if (!madera->pdata.reset) {

		ret = madera_soft_reset(madera);

		if (ret)

			goto err_reset;

	}



	ret = madera_wait_for_boot(madera);

	if (ret) {

		dev_err(madera->dev, "Device failed initial boot: %d\n", ret);

		goto err_reset;

	}



	ret = regmap_read(madera->regmap, MADERA_HARDWARE_REVISION,

			  &madera->rev);

	if (ret) {

		dev_err(dev, "Failed to read revision register: %d\n", ret);

		goto err_reset;

	}

	madera->rev &= MADERA_HW_REVISION_MASK;



	dev_info(dev, "%s silicon revision %d\n", madera->type_name,

		 madera->rev);



	/* Apply hardware patch */

	if (patch_fn) {

		ret = patch_fn(madera);

		if (ret) {

			dev_err(madera->dev, "Failed to apply patch %d\n", ret);

			goto err_reset;

		}

	}



	/* Init 32k clock sourced from MCLK2 */

	ret = regmap_update_bits(madera->regmap,

			MADERA_CLOCK_32K_1,

			MADERA_CLK_32K_ENA_MASK | MADERA_CLK_32K_SRC_MASK,

			MADERA_CLK_32K_ENA | MADERA_32KZ_MCLK2);

	if (ret) {

		dev_err(madera->dev, "Failed to init 32k clock: %d\n", ret);

		goto err_reset;

	}



	pm_runtime_set_active(madera->dev);

	pm_runtime_enable(madera->dev);

	pm_runtime_set_autosuspend_delay(madera->dev, 100);

	pm_runtime_use_autosuspend(madera->dev);



	/* No devm_ because we need to control shutdown order of children */

	ret = mfd_add_devices(madera->dev, PLATFORM_DEVID_NONE,

			      mfd_devs, n_devs,

			      NULL, 0, NULL);

	if (ret) {

		dev_err(madera->dev, "Failed to add subdevices: %d\n", ret);

		goto err_pm_runtime;

	}



	return 0;



err_pm_runtime:

	pm_runtime_disable(madera->dev);

err_reset:

	madera_enable_hard_reset(madera);

	regulator_disable(madera->dcvdd);

err_enable:

	regulator_bulk_disable(madera->num_core_supplies,

			       madera->core_supplies);

err_dcvdd:

	regulator_put(madera->dcvdd);

err_devs:

	mfd_remove_devices(dev);



	return ret;

}

EXPORT_SYMBOL_GPL(madera_dev_init);



int madera_dev_exit(struct madera *madera)

{

	/* Prevent any IRQs being serviced while we clean up */

	disable_irq(madera->irq);



	/*

	 * DCVDD could be supplied by a child node, we must disable it before

	 * removing the children, and prevent PM runtime from turning it back on

	 */

	pm_runtime_disable(madera->dev);



	regulator_disable(madera->dcvdd);

	regulator_put(madera->dcvdd);



	mfd_remove_devices(madera->dev);

	madera_enable_hard_reset(madera);



	regulator_bulk_disable(madera->num_core_supplies,

			       madera->core_supplies);

	return 0;

}

EXPORT_SYMBOL_GPL(madera_dev_exit);



MODULE_DESCRIPTION("Madera core MFD driver");

MODULE_AUTHOR("Richard Fitzgerald <rf@opensource.cirrus.com>");

MODULE_LICENSE("GPL v2");

drivers/mfd/madera-i2c.c

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// SPDX-License-Identifier: GPL-2.0

/*

 * I2C 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/i2c.h>

#include <linux/module.h>

#include <linux/of.h>

#include <linux/of_device.h>

#include <linux/regmap.h>



#include <linux/mfd/madera/core.h>



#include "madera.h"



static int madera_i2c_probe(struct i2c_client *i2c,

			    const struct i2c_device_id *id)

{

	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(&i2c->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_i2c_regmap;

			regmap_32bit_config = &cs47l35_32bit_i2c_regmap;

		}

		break;

	case CS47L85:

	case WM1840:

		if (IS_ENABLED(CONFIG_MFD_CS47L85)) {

			regmap_16bit_config = &cs47l85_16bit_i2c_regmap;

			regmap_32bit_config = &cs47l85_32bit_i2c_regmap;

		}

		break;

	case CS47L90:

	case CS47L91:

		if (IS_ENABLED(CONFIG_MFD_CS47L90)) {

			regmap_16bit_config = &cs47l90_16bit_i2c_regmap;

			regmap_32bit_config = &cs47l90_32bit_i2c_regmap;

		}

		break;

	default:

		dev_err(&i2c->dev,

			"Unknown Madera I2C 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(&i2c->dev,

			"Kernel does not include support for %s\n", name);

		return -EINVAL;

	}



	madera = devm_kzalloc(&i2c->dev, sizeof(*madera), GFP_KERNEL);

	if (!madera)

		return -ENOMEM;





	madera->regmap = devm_regmap_init_i2c(i2c, regmap_16bit_config);

	if (IS_ERR(madera->regmap)) {

		ret = PTR_ERR(madera->regmap);

		dev_err(&i2c->dev,

			"Failed to allocate 16-bit register map: %d\n",	ret);

		return ret;

	}



	madera->regmap_32bit = devm_regmap_init_i2c(i2c, regmap_32bit_config);

	if (IS_ERR(madera->regmap_32bit)) {

		ret = PTR_ERR(madera->regmap_32bit);

		dev_err(&i2c->dev,

			"Failed to allocate 32-bit register map: %d\n", ret);

		return ret;

	}



	madera->type = type;

	madera->type_name = name;

	madera->dev = &i2c->dev;

	madera->irq = i2c->irq;



	return madera_dev_init(madera);

}



static int madera_i2c_remove(struct i2c_client *i2c)

{

	struct madera *madera = dev_get_drvdata(&i2c->dev);



	madera_dev_exit(madera);



	return 0;

}



static const struct i2c_device_id madera_i2c_id[] = {

	{ "cs47l35", CS47L35 },

	{ "cs47l85", CS47L85 },

	{ "cs47l90", CS47L90 },

	{ "cs47l91", CS47L91 },

	{ "wm1840", WM1840 },

	{ }

};

MODULE_DEVICE_TABLE(i2c, madera_i2c_id);



static struct i2c_driver madera_i2c_driver = {

	.driver = {

		.name	= "madera",

		.pm	= &madera_pm_ops,

		.of_match_table	= of_match_ptr(madera_of_match),

	},

	.probe		= madera_i2c_probe,

	.remove		= madera_i2c_remove,

	.id_table	= madera_i2c_id,

};



module_i2c_driver(madera_i2c_driver);



MODULE_DESCRIPTION("Madera I2C bus interface");

MODULE_AUTHOR("Richard Fitzgerald <rf@opensource.cirrus.com>");

MODULE_LICENSE("GPL v2");

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