[linux-block.git] / drivers / mfd / wm8994-core.c

/*
 * wm8994-core.c  --  Device access for Wolfson WM8994
 *
 * Copyright 2009 Wolfson Microelectronics PLC.
 *
 * Author: Mark Brown <broonie@opensource.wolfsonmicro.com>
 *
 *  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;  either version 2 of the  License, or (at your
 *  option) any later version.
 *
 */

#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/slab.h>
#include <linux/i2c.h>
#include <linux/err.h>
#include <linux/delay.h>
#include <linux/mfd/core.h>
#include <linux/pm_runtime.h>
#include <linux/regmap.h>
#include <linux/regulator/consumer.h>
#include <linux/regulator/machine.h>

#include <linux/mfd/wm8994/core.h>
#include <linux/mfd/wm8994/pdata.h>
#include <linux/mfd/wm8994/registers.h>

#include "wm8994.h"

/**
 * wm8994_reg_read: Read a single WM8994 register.
 *
 * @wm8994: Device to read from.
 * @reg: Register to read.
 */
int wm8994_reg_read(struct wm8994 *wm8994, unsigned short reg)
{
	unsigned int val;
	int ret;

	ret = regmap_read(wm8994->regmap, reg, &val);

	if (ret < 0)
		return ret;
	else
		return val;
}
EXPORT_SYMBOL_GPL(wm8994_reg_read);

/**
 * wm8994_bulk_read: Read multiple WM8994 registers
 *
 * @wm8994: Device to read from
 * @reg: First register
 * @count: Number of registers
 * @buf: Buffer to fill.  The data will be returned big endian.
 */
int wm8994_bulk_read(struct wm8994 *wm8994, unsigned short reg,
		     int count, u16 *buf)
{
	return regmap_bulk_read(wm8994->regmap, reg, buf, count);
}

/**
 * wm8994_reg_write: Write a single WM8994 register.
 *
 * @wm8994: Device to write to.
 * @reg: Register to write to.
 * @val: Value to write.
 */
int wm8994_reg_write(struct wm8994 *wm8994, unsigned short reg,
		     unsigned short val)
{
	return regmap_write(wm8994->regmap, reg, val);
}
EXPORT_SYMBOL_GPL(wm8994_reg_write);

/**
 * wm8994_bulk_write: Write multiple WM8994 registers
 *
 * @wm8994: Device to write to
 * @reg: First register
 * @count: Number of registers
 * @buf: Buffer to write from.  Data must be big-endian formatted.
 */
int wm8994_bulk_write(struct wm8994 *wm8994, unsigned short reg,
		      int count, const u16 *buf)
{
	return regmap_raw_write(wm8994->regmap, reg, buf, count * sizeof(u16));
}
EXPORT_SYMBOL_GPL(wm8994_bulk_write);

/**
 * wm8994_set_bits: Set the value of a bitfield in a WM8994 register
 *
 * @wm8994: Device to write to.
 * @reg: Register to write to.
 * @mask: Mask of bits to set.
 * @val: Value to set (unshifted)
 */
int wm8994_set_bits(struct wm8994 *wm8994, unsigned short reg,
		    unsigned short mask, unsigned short val)
{
	return regmap_update_bits(wm8994->regmap, reg, mask, val);
}
EXPORT_SYMBOL_GPL(wm8994_set_bits);

static struct mfd_cell wm8994_regulator_devs[] = {
	{
		.name = "wm8994-ldo",
		.id = 1,
		.pm_runtime_no_callbacks = true,
	},
	{
		.name = "wm8994-ldo",
		.id = 2,
		.pm_runtime_no_callbacks = true,
	},
};

static struct resource wm8994_codec_resources[] = {
	{
		.start = WM8994_IRQ_TEMP_SHUT,
		.end   = WM8994_IRQ_TEMP_WARN,
		.flags = IORESOURCE_IRQ,
	},
};

static struct resource wm8994_gpio_resources[] = {
	{
		.start = WM8994_IRQ_GPIO(1),
		.end   = WM8994_IRQ_GPIO(11),
		.flags = IORESOURCE_IRQ,
	},
};

static struct mfd_cell wm8994_devs[] = {
	{
		.name = "wm8994-codec",
		.num_resources = ARRAY_SIZE(wm8994_codec_resources),
		.resources = wm8994_codec_resources,
	},

	{
		.name = "wm8994-gpio",
		.num_resources = ARRAY_SIZE(wm8994_gpio_resources),
		.resources = wm8994_gpio_resources,
		.pm_runtime_no_callbacks = true,
	},
};

/*
 * Supplies for the main bulk of CODEC; the LDO supplies are ignored
 * and should be handled via the standard regulator API supply
 * management.
 */
static const char *wm1811_main_supplies[] = {
	"DBVDD1",
	"DBVDD2",
	"DBVDD3",
	"DCVDD",
	"AVDD1",
	"AVDD2",
	"CPVDD",
	"SPKVDD1",
	"SPKVDD2",
};

static const char *wm8994_main_supplies[] = {
	"DBVDD",
	"DCVDD",
	"AVDD1",
	"AVDD2",
	"CPVDD",
	"SPKVDD1",
	"SPKVDD2",
};

static const char *wm8958_main_supplies[] = {
	"DBVDD1",
	"DBVDD2",
	"DBVDD3",
	"DCVDD",
	"AVDD1",
	"AVDD2",
	"CPVDD",
	"SPKVDD1",
	"SPKVDD2",
};

#ifdef CONFIG_PM
static int wm8994_suspend(struct device *dev)
{
	struct wm8994 *wm8994 = dev_get_drvdata(dev);
	int ret;

	/* Don't actually go through with the suspend if the CODEC is
	 * still active (eg, for audio passthrough from CP. */
	ret = wm8994_reg_read(wm8994, WM8994_POWER_MANAGEMENT_1);
	if (ret < 0) {
		dev_err(dev, "Failed to read power status: %d\n", ret);
	} else if (ret & WM8994_VMID_SEL_MASK) {
		dev_dbg(dev, "CODEC still active, ignoring suspend\n");
		return 0;
	}

	ret = wm8994_reg_read(wm8994, WM8994_POWER_MANAGEMENT_4);
	if (ret < 0) {
		dev_err(dev, "Failed to read power status: %d\n", ret);
	} else if (ret & (WM8994_AIF2ADCL_ENA | WM8994_AIF2ADCR_ENA |
			  WM8994_AIF1ADC2L_ENA | WM8994_AIF1ADC2R_ENA |
			  WM8994_AIF1ADC1L_ENA | WM8994_AIF1ADC1R_ENA)) {
		dev_dbg(dev, "CODEC still active, ignoring suspend\n");
		return 0;
	}

	ret = wm8994_reg_read(wm8994, WM8994_POWER_MANAGEMENT_5);
	if (ret < 0) {
		dev_err(dev, "Failed to read power status: %d\n", ret);
	} else if (ret & (WM8994_AIF2DACL_ENA | WM8994_AIF2DACR_ENA |
			  WM8994_AIF1DAC2L_ENA | WM8994_AIF1DAC2R_ENA |
			  WM8994_AIF1DAC1L_ENA | WM8994_AIF1DAC1R_ENA)) {
		dev_dbg(dev, "CODEC still active, ignoring suspend\n");
		return 0;
	}

	switch (wm8994->type) {
	case WM8958:
		ret = wm8994_reg_read(wm8994, WM8958_MIC_DETECT_1);
		if (ret < 0) {
			dev_err(dev, "Failed to read power status: %d\n", ret);
		} else if (ret & WM8958_MICD_ENA) {
			dev_dbg(dev, "CODEC still active, ignoring suspend\n");
			return 0;
		}
		break;
	default:
		break;
	}

	switch (wm8994->type) {
	case WM1811:
		ret = wm8994_reg_read(wm8994, WM8994_ANTIPOP_2);
		if (ret < 0) {
			dev_err(dev, "Failed to read jackdet: %d\n", ret);
		} else if (ret & WM1811_JACKDET_MODE_MASK) {
			dev_dbg(dev, "CODEC still active, ignoring suspend\n");
			return 0;
		}
		break;
	default:
		break;
	}

	/* Disable LDO pulldowns while the device is suspended if we
	 * don't know that something will be driving them. */
	if (!wm8994->ldo_ena_always_driven)
		wm8994_set_bits(wm8994, WM8994_PULL_CONTROL_2,
				WM8994_LDO1ENA_PD | WM8994_LDO2ENA_PD,
				WM8994_LDO1ENA_PD | WM8994_LDO2ENA_PD);

	/* Explicitly put the device into reset in case regulators
	 * don't get disabled in order to ensure consistent restart.
	 */
	wm8994_reg_write(wm8994, WM8994_SOFTWARE_RESET,
			 wm8994_reg_read(wm8994, WM8994_SOFTWARE_RESET));

	regcache_mark_dirty(wm8994->regmap);

	wm8994->suspended = true;

	ret = regulator_bulk_disable(wm8994->num_supplies,
				     wm8994->supplies);
	if (ret != 0) {
		dev_err(dev, "Failed to disable supplies: %d\n", ret);
		return ret;
	}

	return 0;
}

static int wm8994_resume(struct device *dev)
{
	struct wm8994 *wm8994 = dev_get_drvdata(dev);
	int ret;

	/* We may have lied to the PM core about suspending */
	if (!wm8994->suspended)
		return 0;

	ret = regulator_bulk_enable(wm8994->num_supplies,
				    wm8994->supplies);
	if (ret != 0) {
		dev_err(dev, "Failed to enable supplies: %d\n", ret);
		return ret;
	}

	ret = regcache_sync(wm8994->regmap);
	if (ret != 0) {
		dev_err(dev, "Failed to restore register map: %d\n", ret);
		goto err_enable;
	}

	/* Disable LDO pulldowns while the device is active */
	wm8994_set_bits(wm8994, WM8994_PULL_CONTROL_2,
			WM8994_LDO1ENA_PD | WM8994_LDO2ENA_PD,
			0);

	wm8994->suspended = false;

	return 0;

err_enable:
	regulator_bulk_disable(wm8994->num_supplies, wm8994->supplies);

	return ret;
}
#endif

#ifdef CONFIG_REGULATOR
static int wm8994_ldo_in_use(struct wm8994_pdata *pdata, int ldo)
{
	struct wm8994_ldo_pdata *ldo_pdata;

	if (!pdata)
		return 0;

	ldo_pdata = &pdata->ldo[ldo];

	if (!ldo_pdata->init_data)
		return 0;

	return ldo_pdata->init_data->num_consumer_supplies != 0;
}
#else
static int wm8994_ldo_in_use(struct wm8994_pdata *pdata, int ldo)
{
	return 0;
}
#endif

/*
 * Instantiate the generic non-control parts of the device.
 */
static int wm8994_device_init(struct wm8994 *wm8994, int irq)
{
	struct wm8994_pdata *pdata = wm8994->dev->platform_data;
	struct regmap_config *regmap_config;
	const char *devname;
	int ret, i;
	int pulls = 0;

	dev_set_drvdata(wm8994->dev, wm8994);

	/* Add the on-chip regulators first for bootstrapping */
	ret = mfd_add_devices(wm8994->dev, -1,
			      wm8994_regulator_devs,
			      ARRAY_SIZE(wm8994_regulator_devs),
			      NULL, 0);
	if (ret != 0) {
		dev_err(wm8994->dev, "Failed to add children: %d\n", ret);
		goto err_regmap;
	}

	switch (wm8994->type) {
	case WM1811:
		wm8994->num_supplies = ARRAY_SIZE(wm1811_main_supplies);
		break;
	case WM8994:
		wm8994->num_supplies = ARRAY_SIZE(wm8994_main_supplies);
		break;
	case WM8958:
		wm8994->num_supplies = ARRAY_SIZE(wm8958_main_supplies);
		break;
	default:
		BUG();
		goto err_regmap;
	}

	wm8994->supplies = devm_kzalloc(wm8994->dev,
					sizeof(struct regulator_bulk_data) *
					wm8994->num_supplies, GFP_KERNEL);
	if (!wm8994->supplies) {
		ret = -ENOMEM;
		goto err_regmap;
	}

	switch (wm8994->type) {
	case WM1811:
		for (i = 0; i < ARRAY_SIZE(wm1811_main_supplies); i++)
			wm8994->supplies[i].supply = wm1811_main_supplies[i];
		break;
	case WM8994:
		for (i = 0; i < ARRAY_SIZE(wm8994_main_supplies); i++)
			wm8994->supplies[i].supply = wm8994_main_supplies[i];
		break;
	case WM8958:
		for (i = 0; i < ARRAY_SIZE(wm8958_main_supplies); i++)
			wm8994->supplies[i].supply = wm8958_main_supplies[i];
		break;
	default:
		BUG();
		goto err_regmap;
	}
		
	ret = regulator_bulk_get(wm8994->dev, wm8994->num_supplies,
				 wm8994->supplies);
	if (ret != 0) {
		dev_err(wm8994->dev, "Failed to get supplies: %d\n", ret);
		goto err_regmap;
	}

	ret = regulator_bulk_enable(wm8994->num_supplies,
				    wm8994->supplies);
	if (ret != 0) {
		dev_err(wm8994->dev, "Failed to enable supplies: %d\n", ret);
		goto err_get;
	}

	ret = wm8994_reg_read(wm8994, WM8994_SOFTWARE_RESET);
	if (ret < 0) {
		dev_err(wm8994->dev, "Failed to read ID register\n");
		goto err_enable;
	}
	switch (ret) {
	case 0x1811:
		devname = "WM1811";
		if (wm8994->type != WM1811)
			dev_warn(wm8994->dev, "Device registered as type %d\n",
				 wm8994->type);
		wm8994->type = WM1811;
		break;
	case 0x8994:
		devname = "WM8994";
		if (wm8994->type != WM8994)
			dev_warn(wm8994->dev, "Device registered as type %d\n",
				 wm8994->type);
		wm8994->type = WM8994;
		break;
	case 0x8958:
		devname = "WM8958";
		if (wm8994->type != WM8958)
			dev_warn(wm8994->dev, "Device registered as type %d\n",
				 wm8994->type);
		wm8994->type = WM8958;
		break;
	default:
		dev_err(wm8994->dev, "Device is not a WM8994, ID is %x\n",
			ret);
		ret = -EINVAL;
		goto err_enable;
	}

	ret = wm8994_reg_read(wm8994, WM8994_CHIP_REVISION);
	if (ret < 0) {
		dev_err(wm8994->dev, "Failed to read revision register: %d\n",
			ret);
		goto err_enable;
	}
	wm8994->revision = ret;

	switch (wm8994->type) {
	case WM8994:
		switch (wm8994->revision) {
		case 0:
		case 1:
			dev_warn(wm8994->dev,
				 "revision %c not fully supported\n",
				 'A' + wm8994->revision);
			break;
		default:
			break;
		}
		break;
	case WM1811:
		/* Revision C did not change the relevant layer */
		if (wm8994->revision > 1)
			wm8994->revision++;
		break;
	default:
		break;
	}

	dev_info(wm8994->dev, "%s revision %c\n", devname,
		 'A' + wm8994->revision);

	switch (wm8994->type) {
	case WM1811:
		regmap_config = &wm1811_regmap_config;
		break;
	case WM8994:
		regmap_config = &wm8994_regmap_config;
		break;
	case WM8958:
		regmap_config = &wm8958_regmap_config;
		break;
	default:
		dev_err(wm8994->dev, "Unknown device type %d\n", wm8994->type);
		return -EINVAL;
	}

	ret = regmap_reinit_cache(wm8994->regmap, regmap_config);
	if (ret != 0) {
		dev_err(wm8994->dev, "Failed to reinit register cache: %d\n",
			ret);
		return ret;
	}

	if (pdata) {
		wm8994->irq_base = pdata->irq_base;
		wm8994->gpio_base = pdata->gpio_base;

		/* GPIO configuration is only applied if it's non-zero */
		for (i = 0; i < ARRAY_SIZE(pdata->gpio_defaults); i++) {
			if (pdata->gpio_defaults[i]) {
				wm8994_set_bits(wm8994, WM8994_GPIO_1 + i,
						0xffff,
						pdata->gpio_defaults[i]);
			}
		}

		wm8994->ldo_ena_always_driven = pdata->ldo_ena_always_driven;

		if (pdata->spkmode_pu)
			pulls |= WM8994_SPKMODE_PU;
	}

	/* Disable unneeded pulls */
	wm8994_set_bits(wm8994, WM8994_PULL_CONTROL_2,
			WM8994_LDO1ENA_PD | WM8994_LDO2ENA_PD |
			WM8994_SPKMODE_PU | WM8994_CSNADDR_PD,
			pulls);

	/* In some system designs where the regulators are not in use,
	 * we can achieve a small reduction in leakage currents by
	 * floating LDO outputs.  This bit makes no difference if the
	 * LDOs are enabled, it only affects cases where the LDOs were
	 * in operation and are then disabled.
	 */
	for (i = 0; i < WM8994_NUM_LDO_REGS; i++) {
		if (wm8994_ldo_in_use(pdata, i))
			wm8994_set_bits(wm8994, WM8994_LDO_1 + i,
					WM8994_LDO1_DISCH, WM8994_LDO1_DISCH);
		else
			wm8994_set_bits(wm8994, WM8994_LDO_1 + i,
					WM8994_LDO1_DISCH, 0);
	}

	wm8994_irq_init(wm8994);

	ret = mfd_add_devices(wm8994->dev, -1,
			      wm8994_devs, ARRAY_SIZE(wm8994_devs),
			      NULL, 0);
	if (ret != 0) {
		dev_err(wm8994->dev, "Failed to add children: %d\n", ret);
		goto err_irq;
	}

	pm_runtime_enable(wm8994->dev);
	pm_runtime_resume(wm8994->dev);

	return 0;

err_irq:
	wm8994_irq_exit(wm8994);
err_enable:
	regulator_bulk_disable(wm8994->num_supplies,
			       wm8994->supplies);
err_get:
	regulator_bulk_free(wm8994->num_supplies, wm8994->supplies);
err_regmap:
	regmap_exit(wm8994->regmap);
	mfd_remove_devices(wm8994->dev);
	return ret;
}

static void wm8994_device_exit(struct wm8994 *wm8994)
{
	pm_runtime_disable(wm8994->dev);
	mfd_remove_devices(wm8994->dev);
	wm8994_irq_exit(wm8994);
	regulator_bulk_disable(wm8994->num_supplies,
			       wm8994->supplies);
	regulator_bulk_free(wm8994->num_supplies, wm8994->supplies);
	regmap_exit(wm8994->regmap);
}

static const struct of_device_id wm8994_of_match[] = {
	{ .compatible = "wlf,wm1811", },
	{ .compatible = "wlf,wm8994", },
	{ .compatible = "wlf,wm8958", },
	{ }
};
MODULE_DEVICE_TABLE(of, wm8994_of_match);

static int wm8994_i2c_probe(struct i2c_client *i2c,
			    const struct i2c_device_id *id)
{
	struct wm8994 *wm8994;
	int ret;

	wm8994 = devm_kzalloc(&i2c->dev, sizeof(struct wm8994), GFP_KERNEL);
	if (wm8994 == NULL)
		return -ENOMEM;

	i2c_set_clientdata(i2c, wm8994);
	wm8994->dev = &i2c->dev;
	wm8994->irq = i2c->irq;
	wm8994->type = id->driver_data;

	wm8994->regmap = regmap_init_i2c(i2c, &wm8994_base_regmap_config);
	if (IS_ERR(wm8994->regmap)) {
		ret = PTR_ERR(wm8994->regmap);
		dev_err(wm8994->dev, "Failed to allocate register map: %d\n",
			ret);
		return ret;
	}

	return wm8994_device_init(wm8994, i2c->irq);
}

static int wm8994_i2c_remove(struct i2c_client *i2c)
{
	struct wm8994 *wm8994 = i2c_get_clientdata(i2c);

	wm8994_device_exit(wm8994);

	return 0;
}

static const struct i2c_device_id wm8994_i2c_id[] = {
	{ "wm1811", WM1811 },
	{ "wm1811a", WM1811 },
	{ "wm8994", WM8994 },
	{ "wm8958", WM8958 },
	{ }
};
MODULE_DEVICE_TABLE(i2c, wm8994_i2c_id);

static UNIVERSAL_DEV_PM_OPS(wm8994_pm_ops, wm8994_suspend, wm8994_resume,
			    NULL);

static struct i2c_driver wm8994_i2c_driver = {
	.driver = {
		.name = "wm8994",
		.owner = THIS_MODULE,
		.pm = &wm8994_pm_ops,
		.of_match_table = wm8994_of_match,
	},
	.probe = wm8994_i2c_probe,
	.remove = wm8994_i2c_remove,
	.id_table = wm8994_i2c_id,
};

static int __init wm8994_i2c_init(void)
{
	int ret;

	ret = i2c_add_driver(&wm8994_i2c_driver);
	if (ret != 0)
		pr_err("Failed to register wm8994 I2C driver: %d\n", ret);

	return ret;
}
module_init(wm8994_i2c_init);

static void __exit wm8994_i2c_exit(void)
{
	i2c_del_driver(&wm8994_i2c_driver);
}
module_exit(wm8994_i2c_exit);

MODULE_DESCRIPTION("Core support for the WM8994 audio CODEC");
MODULE_LICENSE("GPL");
MODULE_AUTHOR("Mark Brown <broonie@opensource.wolfsonmicro.com>");
Commit	Line	Data
9e501086 MB	1	/*
	2	* wm8994-core.c -- Device access for Wolfson WM8994
	3	*
	4	* Copyright 2009 Wolfson Microelectronics PLC.
	5	*
	6	* Author: Mark Brown <broonie@opensource.wolfsonmicro.com>
	7	*
	8	* This program is free software; you can redistribute it and/or modify it
	9	* under the terms of the GNU General Public License as published by the
	10	* Free Software Foundation; either version 2 of the License, or (at your
	11	* option) any later version.
	12	*
	13	*/
	14
	15	#include <linux/kernel.h>
	16	#include <linux/module.h>
5a0e3ad6	17	#include <linux/slab.h>
9e501086	18	#include <linux/i2c.h>
d6c645fc	19	#include <linux/err.h>
9e501086 MB	20	#include <linux/delay.h>
9e501086 MB	21	#include <linux/mfd/core.h>
d450f19e	22	#include <linux/pm_runtime.h>
d6c645fc	23	#include <linux/regmap.h>
9e501086 MB	24	#include <linux/regulator/consumer.h>
	25	#include <linux/regulator/machine.h>
	26
	27	#include <linux/mfd/wm8994/core.h>
	28	#include <linux/mfd/wm8994/pdata.h>
	29	#include <linux/mfd/wm8994/registers.h>
	30
c3f13861	31	#include "wm8994.h"
9e501086 MB	32
	33	/**
	34	* wm8994_reg_read: Read a single WM8994 register.
	35	*
	36	* @wm8994: Device to read from.
	37	* @reg: Register to read.
	38	*/
	39	int wm8994_reg_read(struct wm8994 *wm8994, unsigned short reg)
	40	{
d6c645fc	41	unsigned int val;
9e501086 MB	42	int ret;
9e501086 MB	43
d6c645fc	44	ret = regmap_read(wm8994->regmap, reg, &val);
9e501086 MB	45
	46	if (ret < 0)
	47	return ret;
	48	else
d6c645fc	49	return val;
9e501086 MB	50	}
	51	EXPORT_SYMBOL_GPL(wm8994_reg_read);
	52
	53	/**
	54	* wm8994_bulk_read: Read multiple WM8994 registers
	55	*
	56	* @wm8994: Device to read from
	57	* @reg: First register
	58	* @count: Number of registers
316b6cc0	59	* @buf: Buffer to fill. The data will be returned big endian.
9e501086 MB	60	*/
	61	int wm8994_bulk_read(struct wm8994 *wm8994, unsigned short reg,
	62	int count, u16 *buf)
	63	{
d6c645fc	64	return regmap_bulk_read(wm8994->regmap, reg, buf, count);
9e501086	65	}
9e501086	66
9e501086 MB	67	/**
	68	* wm8994_reg_write: Write a single WM8994 register.
	69	*
	70	* @wm8994: Device to write to.
	71	* @reg: Register to write to.
	72	* @val: Value to write.
	73	*/
	74	int wm8994_reg_write(struct wm8994 *wm8994, unsigned short reg,
	75	unsigned short val)
	76	{
d6c645fc	77	return regmap_write(wm8994->regmap, reg, val);
9e501086 MB	78	}
	79	EXPORT_SYMBOL_GPL(wm8994_reg_write);
	80
e93c5387 MB	81	/**
	82	* wm8994_bulk_write: Write multiple WM8994 registers
	83	*
	84	* @wm8994: Device to write to
	85	* @reg: First register
	86	* @count: Number of registers
4277163c	87	* @buf: Buffer to write from. Data must be big-endian formatted.
e93c5387 MB	88	*/
e93c5387 MB	89	int wm8994_bulk_write(struct wm8994 *wm8994, unsigned short reg,
07e73fbb	90	int count, const u16 *buf)
e93c5387	91	{
d6c645fc	92	return regmap_raw_write(wm8994->regmap, reg, buf, count * sizeof(u16));
e93c5387 MB	93	}
	94	EXPORT_SYMBOL_GPL(wm8994_bulk_write);
	95
9e501086 MB	96	/**
	97	* wm8994_set_bits: Set the value of a bitfield in a WM8994 register
	98	*
	99	* @wm8994: Device to write to.
	100	* @reg: Register to write to.
	101	* @mask: Mask of bits to set.
	102	* @val: Value to set (unshifted)
	103	*/
	104	int wm8994_set_bits(struct wm8994 *wm8994, unsigned short reg,
	105	unsigned short mask, unsigned short val)
	106	{
d6c645fc	107	return regmap_update_bits(wm8994->regmap, reg, mask, val);
9e501086 MB	108	}
	109	EXPORT_SYMBOL_GPL(wm8994_set_bits);
	110
	111	static struct mfd_cell wm8994_regulator_devs[] = {
d450f19e MB	112	{
	113	.name = "wm8994-ldo",
	114	.id = 1,
	115	.pm_runtime_no_callbacks = true,
	116	},
	117	{
	118	.name = "wm8994-ldo",
	119	.id = 2,
	120	.pm_runtime_no_callbacks = true,
	121	},
9e501086 MB	122	};
9e501086 MB	123
c9fbf7e0 MB	124	static struct resource wm8994_codec_resources[] = {
	125	{
	126	.start = WM8994_IRQ_TEMP_SHUT,
	127	.end = WM8994_IRQ_TEMP_WARN,
	128	.flags = IORESOURCE_IRQ,
	129	},
	130	};
	131
	132	static struct resource wm8994_gpio_resources[] = {
	133	{
	134	.start = WM8994_IRQ_GPIO(1),
	135	.end = WM8994_IRQ_GPIO(11),
	136	.flags = IORESOURCE_IRQ,
	137	},
	138	};
	139
9e501086	140	static struct mfd_cell wm8994_devs[] = {
c9fbf7e0 MB	141	{
	142	.name = "wm8994-codec",
	143	.num_resources = ARRAY_SIZE(wm8994_codec_resources),
	144	.resources = wm8994_codec_resources,
	145	},
	146
	147	{
	148	.name = "wm8994-gpio",
	149	.num_resources = ARRAY_SIZE(wm8994_gpio_resources),
	150	.resources = wm8994_gpio_resources,
d450f19e	151	.pm_runtime_no_callbacks = true,
c9fbf7e0	152	},
9e501086 MB	153	};
	154
	155	/*
	156	* Supplies for the main bulk of CODEC; the LDO supplies are ignored
	157	* and should be handled via the standard regulator API supply
	158	* management.
	159	*/
b1f43bf3 MB	160	static const char *wm1811_main_supplies[] = {
	161	"DBVDD1",
	162	"DBVDD2",
	163	"DBVDD3",
	164	"DCVDD",
	165	"AVDD1",
	166	"AVDD2",
	167	"CPVDD",
	168	"SPKVDD1",
	169	"SPKVDD2",
	170	};
	171
9e501086 MB	172	static const char *wm8994_main_supplies[] = {
	173	"DBVDD",
	174	"DCVDD",
	175	"AVDD1",
	176	"AVDD2",
	177	"CPVDD",
	178	"SPKVDD1",
	179	"SPKVDD2",
	180	};
	181
559e0df6 MB	182	static const char *wm8958_main_supplies[] = {
	183	"DBVDD1",
	184	"DBVDD2",
	185	"DBVDD3",
	186	"DCVDD",
	187	"AVDD1",
	188	"AVDD2",
	189	"CPVDD",
	190	"SPKVDD1",
	191	"SPKVDD2",
	192	};
	193
9e501086	194	#ifdef CONFIG_PM
d450f19e	195	static int wm8994_suspend(struct device *dev)
9e501086 MB	196	{
	197	struct wm8994 *wm8994 = dev_get_drvdata(dev);
	198	int ret;
	199
77bd70e9 MB	200	/* Don't actually go through with the suspend if the CODEC is
	201	* still active (eg, for audio passthrough from CP. */
	202	ret = wm8994_reg_read(wm8994, WM8994_POWER_MANAGEMENT_1);
	203	if (ret < 0) {
	204	dev_err(dev, "Failed to read power status: %d\n", ret);
	205	} else if (ret & WM8994_VMID_SEL_MASK) {
	206	dev_dbg(dev, "CODEC still active, ignoring suspend\n");
	207	return 0;
	208	}
	209
5f40c6b6 MB	210	ret = wm8994_reg_read(wm8994, WM8994_POWER_MANAGEMENT_4);
	211	if (ret < 0) {
	212	dev_err(dev, "Failed to read power status: %d\n", ret);
	213	} else if (ret & (WM8994_AIF2ADCL_ENA \| WM8994_AIF2ADCR_ENA \|
	214	WM8994_AIF1ADC2L_ENA \| WM8994_AIF1ADC2R_ENA \|
	215	WM8994_AIF1ADC1L_ENA \| WM8994_AIF1ADC1R_ENA)) {
	216	dev_dbg(dev, "CODEC still active, ignoring suspend\n");
	217	return 0;
	218	}
	219
	220	ret = wm8994_reg_read(wm8994, WM8994_POWER_MANAGEMENT_5);
	221	if (ret < 0) {
	222	dev_err(dev, "Failed to read power status: %d\n", ret);
	223	} else if (ret & (WM8994_AIF2DACL_ENA \| WM8994_AIF2DACR_ENA \|
	224	WM8994_AIF1DAC2L_ENA \| WM8994_AIF1DAC2R_ENA \|
	225	WM8994_AIF1DAC1L_ENA \| WM8994_AIF1DAC1R_ENA)) {
	226	dev_dbg(dev, "CODEC still active, ignoring suspend\n");
	227	return 0;
	228	}
	229
	230	switch (wm8994->type) {
	231	case WM8958:
	232	ret = wm8994_reg_read(wm8994, WM8958_MIC_DETECT_1);
	233	if (ret < 0) {
	234	dev_err(dev, "Failed to read power status: %d\n", ret);
	235	} else if (ret & WM8958_MICD_ENA) {
	236	dev_dbg(dev, "CODEC still active, ignoring suspend\n");
	237	return 0;
	238	}
	239	break;
	240	default:
	241	break;
	242	}
	243
a3462490 MB	244	switch (wm8994->type) {
	245	case WM1811:
	246	ret = wm8994_reg_read(wm8994, WM8994_ANTIPOP_2);
	247	if (ret < 0) {
	248	dev_err(dev, "Failed to read jackdet: %d\n", ret);
	249	} else if (ret & WM1811_JACKDET_MODE_MASK) {
	250	dev_dbg(dev, "CODEC still active, ignoring suspend\n");
	251	return 0;
	252	}
	253	break;
	254	default:
	255	break;
	256	}
	257
881de670 MB	258	/* Disable LDO pulldowns while the device is suspended if we
	259	* don't know that something will be driving them. */
	260	if (!wm8994->ldo_ena_always_driven)
	261	wm8994_set_bits(wm8994, WM8994_PULL_CONTROL_2,
	262	WM8994_LDO1ENA_PD \| WM8994_LDO2ENA_PD,
	263	WM8994_LDO1ENA_PD \| WM8994_LDO2ENA_PD);
	264
f40dff9e MB	265	/* Explicitly put the device into reset in case regulators
	266	* don't get disabled in order to ensure consistent restart.
	267	*/
be79cf2f MB	268	wm8994_reg_write(wm8994, WM8994_SOFTWARE_RESET,
be79cf2f MB	269	wm8994_reg_read(wm8994, WM8994_SOFTWARE_RESET));
f40dff9e	270
c3f13861 MB	271	regcache_mark_dirty(wm8994->regmap);
c3f13861 MB	272
77bd70e9 MB	273	wm8994->suspended = true;
77bd70e9 MB	274
559e0df6	275	ret = regulator_bulk_disable(wm8994->num_supplies,
9e501086 MB	276	wm8994->supplies);
	277	if (ret != 0) {
	278	dev_err(dev, "Failed to disable supplies: %d\n", ret);
	279	return ret;
	280	}
	281
	282	return 0;
	283	}
	284
d450f19e	285	static int wm8994_resume(struct device *dev)
9e501086 MB	286	{
9e501086 MB	287	struct wm8994 *wm8994 = dev_get_drvdata(dev);
c3f13861	288	int ret;
9e501086	289
77bd70e9 MB	290	/* We may have lied to the PM core about suspending */
	291	if (!wm8994->suspended)
	292	return 0;
	293
559e0df6	294	ret = regulator_bulk_enable(wm8994->num_supplies,
9e501086 MB	295	wm8994->supplies);
	296	if (ret != 0) {
	297	dev_err(dev, "Failed to enable supplies: %d\n", ret);
	298	return ret;
	299	}
	300
c3f13861 MB	301	ret = regcache_sync(wm8994->regmap);
	302	if (ret != 0) {
	303	dev_err(dev, "Failed to restore register map: %d\n", ret);
	304	goto err_enable;
98ae1cca	305	}
c9fbf7e0	306
881de670 MB	307	/* Disable LDO pulldowns while the device is active */
	308	wm8994_set_bits(wm8994, WM8994_PULL_CONTROL_2,
	309	WM8994_LDO1ENA_PD \| WM8994_LDO2ENA_PD,
	310	0);
	311
77bd70e9 MB	312	wm8994->suspended = false;
77bd70e9 MB	313
9e501086	314	return 0;
c3f13861 MB	315
	316	err_enable:
	317	regulator_bulk_disable(wm8994->num_supplies, wm8994->supplies);
	318
	319	return ret;
9e501086 MB	320	}
	321	#endif
	322
	323	#ifdef CONFIG_REGULATOR
	324	static int wm8994_ldo_in_use(struct wm8994_pdata *pdata, int ldo)
	325	{
	326	struct wm8994_ldo_pdata *ldo_pdata;
	327
	328	if (!pdata)
	329	return 0;
	330
	331	ldo_pdata = &pdata->ldo[ldo];
	332
	333	if (!ldo_pdata->init_data)
	334	return 0;
	335
	336	return ldo_pdata->init_data->num_consumer_supplies != 0;
	337	}
	338	#else
	339	static int wm8994_ldo_in_use(struct wm8994_pdata *pdata, int ldo)
	340	{
	341	return 0;
	342	}
	343	#endif
	344
	345	/*
	346	* Instantiate the generic non-control parts of the device.
	347	*/
559e0df6	348	static int wm8994_device_init(struct wm8994 *wm8994, int irq)
9e501086 MB	349	{
9e501086 MB	350	struct wm8994_pdata *pdata = wm8994->dev->platform_data;
34697898	351	struct regmap_config *regmap_config;
559e0df6	352	const char *devname;
9e501086	353	int ret, i;
26c34c25	354	int pulls = 0;
9e501086	355
9e501086 MB	356	dev_set_drvdata(wm8994->dev, wm8994);
	357
	358	/* Add the on-chip regulators first for bootstrapping */
	359	ret = mfd_add_devices(wm8994->dev, -1,
	360	wm8994_regulator_devs,
	361	ARRAY_SIZE(wm8994_regulator_devs),
	362	NULL, 0);
	363	if (ret != 0) {
	364	dev_err(wm8994->dev, "Failed to add children: %d\n", ret);
d6c645fc	365	goto err_regmap;
9e501086 MB	366	}
9e501086 MB	367
559e0df6	368	switch (wm8994->type) {
b1f43bf3 MB	369	case WM1811:
	370	wm8994->num_supplies = ARRAY_SIZE(wm1811_main_supplies);
	371	break;
559e0df6 MB	372	case WM8994:
	373	wm8994->num_supplies = ARRAY_SIZE(wm8994_main_supplies);
	374	break;
	375	case WM8958:
	376	wm8994->num_supplies = ARRAY_SIZE(wm8958_main_supplies);
	377	break;
	378	default:
	379	BUG();
d6c645fc	380	goto err_regmap;
559e0df6 MB	381	}
559e0df6 MB	382
2fa33494 MB	383	wm8994->supplies = devm_kzalloc(wm8994->dev,
	384	sizeof(struct regulator_bulk_data) *
	385	wm8994->num_supplies, GFP_KERNEL);
fccbd21f AL	386	if (!wm8994->supplies) {
fccbd21f AL	387	ret = -ENOMEM;
d6c645fc	388	goto err_regmap;
fccbd21f	389	}
9e501086	390
559e0df6	391	switch (wm8994->type) {
b1f43bf3 MB	392	case WM1811:
	393	for (i = 0; i < ARRAY_SIZE(wm1811_main_supplies); i++)
	394	wm8994->supplies[i].supply = wm1811_main_supplies[i];
	395	break;
559e0df6 MB	396	case WM8994:
	397	for (i = 0; i < ARRAY_SIZE(wm8994_main_supplies); i++)
	398	wm8994->supplies[i].supply = wm8994_main_supplies[i];
	399	break;
	400	case WM8958:
	401	for (i = 0; i < ARRAY_SIZE(wm8958_main_supplies); i++)
	402	wm8994->supplies[i].supply = wm8958_main_supplies[i];
	403	break;
	404	default:
	405	BUG();
d6c645fc	406	goto err_regmap;
559e0df6 MB	407	}
	408
	409	ret = regulator_bulk_get(wm8994->dev, wm8994->num_supplies,
9e501086 MB	410	wm8994->supplies);
	411	if (ret != 0) {
	412	dev_err(wm8994->dev, "Failed to get supplies: %d\n", ret);
2fa33494	413	goto err_regmap;
9e501086 MB	414	}
9e501086 MB	415
559e0df6	416	ret = regulator_bulk_enable(wm8994->num_supplies,
9e501086 MB	417	wm8994->supplies);
	418	if (ret != 0) {
	419	dev_err(wm8994->dev, "Failed to enable supplies: %d\n", ret);
7731074a	420	goto err_get;
9e501086 MB	421	}
	422
	423	ret = wm8994_reg_read(wm8994, WM8994_SOFTWARE_RESET);
	424	if (ret < 0) {
	425	dev_err(wm8994->dev, "Failed to read ID register\n");
	426	goto err_enable;
	427	}
559e0df6	428	switch (ret) {
b1f43bf3 MB	429	case 0x1811:
	430	devname = "WM1811";
	431	if (wm8994->type != WM1811)
	432	dev_warn(wm8994->dev, "Device registered as type %d\n",
	433	wm8994->type);
	434	wm8994->type = WM1811;
	435	break;
559e0df6 MB	436	case 0x8994:
	437	devname = "WM8994";
	438	if (wm8994->type != WM8994)
	439	dev_warn(wm8994->dev, "Device registered as type %d\n",
	440	wm8994->type);
	441	wm8994->type = WM8994;
	442	break;
	443	case 0x8958:
	444	devname = "WM8958";
	445	if (wm8994->type != WM8958)
	446	dev_warn(wm8994->dev, "Device registered as type %d\n",
	447	wm8994->type);
	448	wm8994->type = WM8958;
	449	break;
	450	default:
9e501086 MB	451	dev_err(wm8994->dev, "Device is not a WM8994, ID is %x\n",
	452	ret);
	453	ret = -EINVAL;
	454	goto err_enable;
	455	}
	456
	457	ret = wm8994_reg_read(wm8994, WM8994_CHIP_REVISION);
	458	if (ret < 0) {
	459	dev_err(wm8994->dev, "Failed to read revision register: %d\n",
	460	ret);
	461	goto err_enable;
	462	}
7ed5849c	463	wm8994->revision = ret;
9e501086	464
a2495bc7 MB	465	switch (wm8994->type) {
a2495bc7 MB	466	case WM8994:
7ed5849c	467	switch (wm8994->revision) {
a2495bc7 MB	468	case 0:
a2495bc7 MB	469	case 1:
559e0df6 MB	470	dev_warn(wm8994->dev,
559e0df6 MB	471	"revision %c not fully supported\n",
7ed5849c	472	'A' + wm8994->revision);
a2495bc7 MB	473	break;
	474	default:
	475	break;
	476	}
9e501086	477	break;
443e67ed MB	478	case WM1811:
443e67ed MB	479	/* Revision C did not change the relevant layer */
7ed5849c MB	480	if (wm8994->revision > 1)
7ed5849c MB	481	wm8994->revision++;
443e67ed	482	break;
9e501086	483	default:
9e501086 MB	484	break;
	485	}
	486
7ed5849c MB	487	dev_info(wm8994->dev, "%s revision %c\n", devname,
7ed5849c MB	488	'A' + wm8994->revision);
9e501086	489
34697898 MB	490	switch (wm8994->type) {
	491	case WM1811:
	492	regmap_config = &wm1811_regmap_config;
	493	break;
	494	case WM8994:
	495	regmap_config = &wm8994_regmap_config;
	496	break;
	497	case WM8958:
	498	regmap_config = &wm8958_regmap_config;
	499	break;
	500	default:
	501	dev_err(wm8994->dev, "Unknown device type %d\n", wm8994->type);
	502	return -EINVAL;
	503	}
	504
	505	ret = regmap_reinit_cache(wm8994->regmap, regmap_config);
	506	if (ret != 0) {
	507	dev_err(wm8994->dev, "Failed to reinit register cache: %d\n",
	508	ret);
	509	return ret;
	510	}
	511
9e501086	512	if (pdata) {
c9fbf7e0	513	wm8994->irq_base = pdata->irq_base;
9e501086 MB	514	wm8994->gpio_base = pdata->gpio_base;
	515
	516	/* GPIO configuration is only applied if it's non-zero */
	517	for (i = 0; i < ARRAY_SIZE(pdata->gpio_defaults); i++) {
	518	if (pdata->gpio_defaults[i]) {
	519	wm8994_set_bits(wm8994, WM8994_GPIO_1 + i,
	520	0xffff,
	521	pdata->gpio_defaults[i]);
	522	}
	523	}
881de670 MB	524
881de670 MB	525	wm8994->ldo_ena_always_driven = pdata->ldo_ena_always_driven;
26c34c25 MB	526
	527	if (pdata->spkmode_pu)
	528	pulls \|= WM8994_SPKMODE_PU;
9e501086 MB	529	}
9e501086 MB	530
26c34c25	531	/* Disable unneeded pulls */
881de670	532	wm8994_set_bits(wm8994, WM8994_PULL_CONTROL_2,
26c34c25 MB	533	WM8994_LDO1ENA_PD \| WM8994_LDO2ENA_PD \|
	534	WM8994_SPKMODE_PU \| WM8994_CSNADDR_PD,
	535	pulls);
881de670	536
9e501086 MB	537	/* In some system designs where the regulators are not in use,
	538	* we can achieve a small reduction in leakage currents by
	539	* floating LDO outputs. This bit makes no difference if the
	540	* LDOs are enabled, it only affects cases where the LDOs were
	541	* in operation and are then disabled.
	542	*/
	543	for (i = 0; i < WM8994_NUM_LDO_REGS; i++) {
	544	if (wm8994_ldo_in_use(pdata, i))
	545	wm8994_set_bits(wm8994, WM8994_LDO_1 + i,
	546	WM8994_LDO1_DISCH, WM8994_LDO1_DISCH);
	547	else
	548	wm8994_set_bits(wm8994, WM8994_LDO_1 + i,
	549	WM8994_LDO1_DISCH, 0);
	550	}
	551
c9fbf7e0 MB	552	wm8994_irq_init(wm8994);
c9fbf7e0 MB	553
9e501086 MB	554	ret = mfd_add_devices(wm8994->dev, -1,
	555	wm8994_devs, ARRAY_SIZE(wm8994_devs),
	556	NULL, 0);
	557	if (ret != 0) {
	558	dev_err(wm8994->dev, "Failed to add children: %d\n", ret);
c9fbf7e0	559	goto err_irq;
9e501086 MB	560	}
9e501086 MB	561
d450f19e MB	562	pm_runtime_enable(wm8994->dev);
	563	pm_runtime_resume(wm8994->dev);
	564
9e501086 MB	565	return 0;
9e501086 MB	566
c9fbf7e0 MB	567	err_irq:
c9fbf7e0 MB	568	wm8994_irq_exit(wm8994);
9e501086	569	err_enable:
559e0df6	570	regulator_bulk_disable(wm8994->num_supplies,
9e501086 MB	571	wm8994->supplies);
9e501086 MB	572	err_get:
559e0df6	573	regulator_bulk_free(wm8994->num_supplies, wm8994->supplies);
d6c645fc MB	574	err_regmap:
d6c645fc MB	575	regmap_exit(wm8994->regmap);
9e501086	576	mfd_remove_devices(wm8994->dev);
9e501086 MB	577	return ret;
	578	}
	579
	580	static void wm8994_device_exit(struct wm8994 *wm8994)
	581	{
d450f19e	582	pm_runtime_disable(wm8994->dev);
9e501086	583	mfd_remove_devices(wm8994->dev);
c9fbf7e0	584	wm8994_irq_exit(wm8994);
559e0df6	585	regulator_bulk_disable(wm8994->num_supplies,
9e501086	586	wm8994->supplies);
559e0df6	587	regulator_bulk_free(wm8994->num_supplies, wm8994->supplies);
d6c645fc	588	regmap_exit(wm8994->regmap);
9e501086 MB	589	}
9e501086 MB	590
cf763c2e MB	591	static const struct of_device_id wm8994_of_match[] = {
	592	{ .compatible = "wlf,wm1811", },
	593	{ .compatible = "wlf,wm8994", },
	594	{ .compatible = "wlf,wm8958", },
	595	{ }
	596	};
	597	MODULE_DEVICE_TABLE(of, wm8994_of_match);
	598
9e501086 MB	599	static int wm8994_i2c_probe(struct i2c_client *i2c,
	600	const struct i2c_device_id *id)
	601	{
	602	struct wm8994 *wm8994;
d6c645fc	603	int ret;
9e501086	604
2fa33494	605	wm8994 = devm_kzalloc(&i2c->dev, sizeof(struct wm8994), GFP_KERNEL);
d0a11693	606	if (wm8994 == NULL)
9e501086	607	return -ENOMEM;
9e501086 MB	608
	609	i2c_set_clientdata(i2c, wm8994);
	610	wm8994->dev = &i2c->dev;
c9fbf7e0	611	wm8994->irq = i2c->irq;
559e0df6	612	wm8994->type = id->driver_data;
9e501086	613
34697898	614	wm8994->regmap = regmap_init_i2c(i2c, &wm8994_base_regmap_config);
d6c645fc MB	615	if (IS_ERR(wm8994->regmap)) {
	616	ret = PTR_ERR(wm8994->regmap);
	617	dev_err(wm8994->dev, "Failed to allocate register map: %d\n",
	618	ret);
d6c645fc MB	619	return ret;
	620	}
	621
559e0df6	622	return wm8994_device_init(wm8994, i2c->irq);
9e501086 MB	623	}
	624
	625	static int wm8994_i2c_remove(struct i2c_client *i2c)
	626	{
	627	struct wm8994 *wm8994 = i2c_get_clientdata(i2c);
	628
	629	wm8994_device_exit(wm8994);
	630
	631	return 0;
	632	}
	633
9e501086	634	static const struct i2c_device_id wm8994_i2c_id[] = {
b1f43bf3	635	{ "wm1811", WM1811 },
71d17184	636	{ "wm1811a", WM1811 },
559e0df6 MB	637	{ "wm8994", WM8994 },
559e0df6 MB	638	{ "wm8958", WM8958 },
9e501086 MB	639	{ }
	640	};
	641	MODULE_DEVICE_TABLE(i2c, wm8994_i2c_id);
	642
aad34310 MB	643	static UNIVERSAL_DEV_PM_OPS(wm8994_pm_ops, wm8994_suspend, wm8994_resume,
aad34310 MB	644	NULL);
d450f19e	645
9e501086 MB	646	static struct i2c_driver wm8994_i2c_driver = {
9e501086 MB	647	.driver = {
d450f19e MB	648	.name = "wm8994",
	649	.owner = THIS_MODULE,
	650	.pm = &wm8994_pm_ops,
cf763c2e	651	.of_match_table = wm8994_of_match,
9e501086 MB	652	},
	653	.probe = wm8994_i2c_probe,
	654	.remove = wm8994_i2c_remove,
9e501086 MB	655	.id_table = wm8994_i2c_id,
	656	};
	657
	658	static int __init wm8994_i2c_init(void)
	659	{
	660	int ret;
	661
	662	ret = i2c_add_driver(&wm8994_i2c_driver);
	663	if (ret != 0)
	664	pr_err("Failed to register wm8994 I2C driver: %d\n", ret);
	665
	666	return ret;
	667	}
	668	module_init(wm8994_i2c_init);
	669
	670	static void __exit wm8994_i2c_exit(void)
	671	{
	672	i2c_del_driver(&wm8994_i2c_driver);
	673	}
	674	module_exit(wm8994_i2c_exit);
	675
	676	MODULE_DESCRIPTION("Core support for the WM8994 audio CODEC");
	677	MODULE_LICENSE("GPL");
	678	MODULE_AUTHOR("Mark Brown <broonie@opensource.wolfsonmicro.com>");