[deliverable/linux.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:
	case WM1811:
		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_cache_only(wm8994->regmap, true);
	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;
	}

	regcache_cache_only(wm8994->regmap, false);
	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:
b5488b6e	232	case WM1811:
5f40c6b6 MB	233	ret = wm8994_reg_read(wm8994, WM8958_MIC_DETECT_1);
	234	if (ret < 0) {
	235	dev_err(dev, "Failed to read power status: %d\n", ret);
	236	} else if (ret & WM8958_MICD_ENA) {
	237	dev_dbg(dev, "CODEC still active, ignoring suspend\n");
	238	return 0;
	239	}
	240	break;
	241	default:
	242	break;
	243	}
	244
a3462490 MB	245	switch (wm8994->type) {
	246	case WM1811:
	247	ret = wm8994_reg_read(wm8994, WM8994_ANTIPOP_2);
	248	if (ret < 0) {
	249	dev_err(dev, "Failed to read jackdet: %d\n", ret);
	250	} else if (ret & WM1811_JACKDET_MODE_MASK) {
	251	dev_dbg(dev, "CODEC still active, ignoring suspend\n");
	252	return 0;
	253	}
	254	break;
	255	default:
	256	break;
	257	}
	258
881de670 MB	259	/* Disable LDO pulldowns while the device is suspended if we
	260	* don't know that something will be driving them. */
	261	if (!wm8994->ldo_ena_always_driven)
	262	wm8994_set_bits(wm8994, WM8994_PULL_CONTROL_2,
	263	WM8994_LDO1ENA_PD \| WM8994_LDO2ENA_PD,
	264	WM8994_LDO1ENA_PD \| WM8994_LDO2ENA_PD);
	265
f40dff9e MB	266	/* Explicitly put the device into reset in case regulators
	267	* don't get disabled in order to ensure consistent restart.
	268	*/
be79cf2f MB	269	wm8994_reg_write(wm8994, WM8994_SOFTWARE_RESET,
be79cf2f MB	270	wm8994_reg_read(wm8994, WM8994_SOFTWARE_RESET));
f40dff9e	271
3befc925	272	regcache_cache_only(wm8994->regmap, true);
c3f13861	273	regcache_mark_dirty(wm8994->regmap);
f40dff9e	274
77bd70e9 MB	275	wm8994->suspended = true;
77bd70e9 MB	276
559e0df6	277	ret = regulator_bulk_disable(wm8994->num_supplies,
9e501086 MB	278	wm8994->supplies);
	279	if (ret != 0) {
	280	dev_err(dev, "Failed to disable supplies: %d\n", ret);
	281	return ret;
	282	}
	283
	284	return 0;
	285	}
	286
d450f19e	287	static int wm8994_resume(struct device *dev)
9e501086 MB	288	{
9e501086 MB	289	struct wm8994 *wm8994 = dev_get_drvdata(dev);
c3f13861	290	int ret;
9e501086	291
77bd70e9 MB	292	/* We may have lied to the PM core about suspending */
	293	if (!wm8994->suspended)
	294	return 0;
	295
559e0df6	296	ret = regulator_bulk_enable(wm8994->num_supplies,
9e501086 MB	297	wm8994->supplies);
	298	if (ret != 0) {
	299	dev_err(dev, "Failed to enable supplies: %d\n", ret);
	300	return ret;
	301	}
	302
3befc925	303	regcache_cache_only(wm8994->regmap, false);
c3f13861 MB	304	ret = regcache_sync(wm8994->regmap);
	305	if (ret != 0) {
	306	dev_err(dev, "Failed to restore register map: %d\n", ret);
	307	goto err_enable;
98ae1cca	308	}
c9fbf7e0	309
881de670 MB	310	/* Disable LDO pulldowns while the device is active */
	311	wm8994_set_bits(wm8994, WM8994_PULL_CONTROL_2,
	312	WM8994_LDO1ENA_PD \| WM8994_LDO2ENA_PD,
	313	0);
	314
77bd70e9 MB	315	wm8994->suspended = false;
77bd70e9 MB	316
9e501086	317	return 0;
c3f13861 MB	318
	319	err_enable:
	320	regulator_bulk_disable(wm8994->num_supplies, wm8994->supplies);
	321
	322	return ret;
9e501086 MB	323	}
	324	#endif
	325
	326	#ifdef CONFIG_REGULATOR
	327	static int wm8994_ldo_in_use(struct wm8994_pdata *pdata, int ldo)
	328	{
	329	struct wm8994_ldo_pdata *ldo_pdata;
	330
	331	if (!pdata)
	332	return 0;
	333
	334	ldo_pdata = &pdata->ldo[ldo];
	335
	336	if (!ldo_pdata->init_data)
	337	return 0;
	338
	339	return ldo_pdata->init_data->num_consumer_supplies != 0;
	340	}
	341	#else
	342	static int wm8994_ldo_in_use(struct wm8994_pdata *pdata, int ldo)
	343	{
	344	return 0;
	345	}
	346	#endif
	347
	348	/*
	349	* Instantiate the generic non-control parts of the device.
	350	*/
559e0df6	351	static int wm8994_device_init(struct wm8994 *wm8994, int irq)
9e501086 MB	352	{
9e501086 MB	353	struct wm8994_pdata *pdata = wm8994->dev->platform_data;
34697898	354	struct regmap_config *regmap_config;
559e0df6	355	const char *devname;
9e501086	356	int ret, i;
26c34c25	357	int pulls = 0;
9e501086	358
9e501086 MB	359	dev_set_drvdata(wm8994->dev, wm8994);
	360
	361	/* Add the on-chip regulators first for bootstrapping */
	362	ret = mfd_add_devices(wm8994->dev, -1,
	363	wm8994_regulator_devs,
	364	ARRAY_SIZE(wm8994_regulator_devs),
	365	NULL, 0);
	366	if (ret != 0) {
	367	dev_err(wm8994->dev, "Failed to add children: %d\n", ret);
d6c645fc	368	goto err_regmap;
9e501086 MB	369	}
9e501086 MB	370
559e0df6	371	switch (wm8994->type) {
b1f43bf3 MB	372	case WM1811:
	373	wm8994->num_supplies = ARRAY_SIZE(wm1811_main_supplies);
	374	break;
559e0df6 MB	375	case WM8994:
	376	wm8994->num_supplies = ARRAY_SIZE(wm8994_main_supplies);
	377	break;
	378	case WM8958:
	379	wm8994->num_supplies = ARRAY_SIZE(wm8958_main_supplies);
	380	break;
	381	default:
	382	BUG();
d6c645fc	383	goto err_regmap;
559e0df6 MB	384	}
559e0df6 MB	385
2fa33494 MB	386	wm8994->supplies = devm_kzalloc(wm8994->dev,
	387	sizeof(struct regulator_bulk_data) *
	388	wm8994->num_supplies, GFP_KERNEL);
fccbd21f AL	389	if (!wm8994->supplies) {
fccbd21f AL	390	ret = -ENOMEM;
d6c645fc	391	goto err_regmap;
fccbd21f	392	}
9e501086	393
559e0df6	394	switch (wm8994->type) {
b1f43bf3 MB	395	case WM1811:
	396	for (i = 0; i < ARRAY_SIZE(wm1811_main_supplies); i++)
	397	wm8994->supplies[i].supply = wm1811_main_supplies[i];
	398	break;
559e0df6 MB	399	case WM8994:
	400	for (i = 0; i < ARRAY_SIZE(wm8994_main_supplies); i++)
	401	wm8994->supplies[i].supply = wm8994_main_supplies[i];
	402	break;
	403	case WM8958:
	404	for (i = 0; i < ARRAY_SIZE(wm8958_main_supplies); i++)
	405	wm8994->supplies[i].supply = wm8958_main_supplies[i];
	406	break;
	407	default:
	408	BUG();
d6c645fc	409	goto err_regmap;
559e0df6 MB	410	}
	411
	412	ret = regulator_bulk_get(wm8994->dev, wm8994->num_supplies,
9e501086 MB	413	wm8994->supplies);
	414	if (ret != 0) {
	415	dev_err(wm8994->dev, "Failed to get supplies: %d\n", ret);
2fa33494	416	goto err_regmap;
9e501086 MB	417	}
9e501086 MB	418
559e0df6	419	ret = regulator_bulk_enable(wm8994->num_supplies,
9e501086 MB	420	wm8994->supplies);
	421	if (ret != 0) {
	422	dev_err(wm8994->dev, "Failed to enable supplies: %d\n", ret);
7731074a	423	goto err_get;
9e501086 MB	424	}
	425
	426	ret = wm8994_reg_read(wm8994, WM8994_SOFTWARE_RESET);
	427	if (ret < 0) {
	428	dev_err(wm8994->dev, "Failed to read ID register\n");
	429	goto err_enable;
	430	}
559e0df6	431	switch (ret) {
b1f43bf3 MB	432	case 0x1811:
	433	devname = "WM1811";
	434	if (wm8994->type != WM1811)
	435	dev_warn(wm8994->dev, "Device registered as type %d\n",
	436	wm8994->type);
	437	wm8994->type = WM1811;
	438	break;
559e0df6 MB	439	case 0x8994:
	440	devname = "WM8994";
	441	if (wm8994->type != WM8994)
	442	dev_warn(wm8994->dev, "Device registered as type %d\n",
	443	wm8994->type);
	444	wm8994->type = WM8994;
	445	break;
	446	case 0x8958:
	447	devname = "WM8958";
	448	if (wm8994->type != WM8958)
	449	dev_warn(wm8994->dev, "Device registered as type %d\n",
	450	wm8994->type);
	451	wm8994->type = WM8958;
	452	break;
	453	default:
9e501086 MB	454	dev_err(wm8994->dev, "Device is not a WM8994, ID is %x\n",
	455	ret);
	456	ret = -EINVAL;
	457	goto err_enable;
	458	}
	459
	460	ret = wm8994_reg_read(wm8994, WM8994_CHIP_REVISION);
	461	if (ret < 0) {
	462	dev_err(wm8994->dev, "Failed to read revision register: %d\n",
	463	ret);
	464	goto err_enable;
	465	}
7ed5849c	466	wm8994->revision = ret;
9e501086	467
a2495bc7 MB	468	switch (wm8994->type) {
a2495bc7 MB	469	case WM8994:
7ed5849c	470	switch (wm8994->revision) {
a2495bc7 MB	471	case 0:
a2495bc7 MB	472	case 1:
559e0df6 MB	473	dev_warn(wm8994->dev,
559e0df6 MB	474	"revision %c not fully supported\n",
7ed5849c	475	'A' + wm8994->revision);
a2495bc7 MB	476	break;
	477	default:
	478	break;
	479	}
9e501086	480	break;
443e67ed MB	481	case WM1811:
443e67ed MB	482	/* Revision C did not change the relevant layer */
7ed5849c MB	483	if (wm8994->revision > 1)
7ed5849c MB	484	wm8994->revision++;
443e67ed	485	break;
9e501086	486	default:
9e501086 MB	487	break;
	488	}
	489
7ed5849c MB	490	dev_info(wm8994->dev, "%s revision %c\n", devname,
7ed5849c MB	491	'A' + wm8994->revision);
9e501086	492
34697898 MB	493	switch (wm8994->type) {
	494	case WM1811:
	495	regmap_config = &wm1811_regmap_config;
	496	break;
	497	case WM8994:
	498	regmap_config = &wm8994_regmap_config;
	499	break;
	500	case WM8958:
	501	regmap_config = &wm8958_regmap_config;
	502	break;
	503	default:
	504	dev_err(wm8994->dev, "Unknown device type %d\n", wm8994->type);
	505	return -EINVAL;
	506	}
	507
	508	ret = regmap_reinit_cache(wm8994->regmap, regmap_config);
	509	if (ret != 0) {
	510	dev_err(wm8994->dev, "Failed to reinit register cache: %d\n",
	511	ret);
	512	return ret;
	513	}
9e501086 MB	514
9e501086 MB	515	if (pdata) {
c9fbf7e0	516	wm8994->irq_base = pdata->irq_base;
9e501086 MB	517	wm8994->gpio_base = pdata->gpio_base;
	518
	519	/* GPIO configuration is only applied if it's non-zero */
	520	for (i = 0; i < ARRAY_SIZE(pdata->gpio_defaults); i++) {
	521	if (pdata->gpio_defaults[i]) {
	522	wm8994_set_bits(wm8994, WM8994_GPIO_1 + i,
	523	0xffff,
	524	pdata->gpio_defaults[i]);
	525	}
	526	}
881de670 MB	527
881de670 MB	528	wm8994->ldo_ena_always_driven = pdata->ldo_ena_always_driven;
26c34c25 MB	529
	530	if (pdata->spkmode_pu)
	531	pulls \|= WM8994_SPKMODE_PU;
9e501086 MB	532	}
9e501086 MB	533
26c34c25	534	/* Disable unneeded pulls */
881de670	535	wm8994_set_bits(wm8994, WM8994_PULL_CONTROL_2,
26c34c25 MB	536	WM8994_LDO1ENA_PD \| WM8994_LDO2ENA_PD \|
	537	WM8994_SPKMODE_PU \| WM8994_CSNADDR_PD,
	538	pulls);
881de670	539
9e501086 MB	540	/* In some system designs where the regulators are not in use,
	541	* we can achieve a small reduction in leakage currents by
	542	* floating LDO outputs. This bit makes no difference if the
	543	* LDOs are enabled, it only affects cases where the LDOs were
	544	* in operation and are then disabled.
	545	*/
	546	for (i = 0; i < WM8994_NUM_LDO_REGS; i++) {
	547	if (wm8994_ldo_in_use(pdata, i))
	548	wm8994_set_bits(wm8994, WM8994_LDO_1 + i,
	549	WM8994_LDO1_DISCH, WM8994_LDO1_DISCH);
	550	else
	551	wm8994_set_bits(wm8994, WM8994_LDO_1 + i,
	552	WM8994_LDO1_DISCH, 0);
	553	}
	554
c9fbf7e0 MB	555	wm8994_irq_init(wm8994);
c9fbf7e0 MB	556
9e501086 MB	557	ret = mfd_add_devices(wm8994->dev, -1,
	558	wm8994_devs, ARRAY_SIZE(wm8994_devs),
	559	NULL, 0);
	560	if (ret != 0) {
	561	dev_err(wm8994->dev, "Failed to add children: %d\n", ret);
c9fbf7e0	562	goto err_irq;
9e501086 MB	563	}
9e501086 MB	564
d450f19e MB	565	pm_runtime_enable(wm8994->dev);
	566	pm_runtime_resume(wm8994->dev);
	567
9e501086 MB	568	return 0;
9e501086 MB	569
c9fbf7e0 MB	570	err_irq:
c9fbf7e0 MB	571	wm8994_irq_exit(wm8994);
9e501086	572	err_enable:
559e0df6	573	regulator_bulk_disable(wm8994->num_supplies,
9e501086 MB	574	wm8994->supplies);
9e501086 MB	575	err_get:
559e0df6	576	regulator_bulk_free(wm8994->num_supplies, wm8994->supplies);
d6c645fc MB	577	err_regmap:
d6c645fc MB	578	regmap_exit(wm8994->regmap);
9e501086	579	mfd_remove_devices(wm8994->dev);
9e501086 MB	580	return ret;
	581	}
	582
	583	static void wm8994_device_exit(struct wm8994 *wm8994)
	584	{
d450f19e	585	pm_runtime_disable(wm8994->dev);
9e501086	586	mfd_remove_devices(wm8994->dev);
c9fbf7e0	587	wm8994_irq_exit(wm8994);
559e0df6	588	regulator_bulk_disable(wm8994->num_supplies,
9e501086	589	wm8994->supplies);
559e0df6	590	regulator_bulk_free(wm8994->num_supplies, wm8994->supplies);
d6c645fc	591	regmap_exit(wm8994->regmap);
9e501086 MB	592	}
9e501086 MB	593
cf763c2e MB	594	static const struct of_device_id wm8994_of_match[] = {
	595	{ .compatible = "wlf,wm1811", },
	596	{ .compatible = "wlf,wm8994", },
	597	{ .compatible = "wlf,wm8958", },
	598	{ }
	599	};
	600	MODULE_DEVICE_TABLE(of, wm8994_of_match);
	601
9e501086 MB	602	static int wm8994_i2c_probe(struct i2c_client *i2c,
	603	const struct i2c_device_id *id)
	604	{
	605	struct wm8994 *wm8994;
d6c645fc	606	int ret;
9e501086	607
2fa33494	608	wm8994 = devm_kzalloc(&i2c->dev, sizeof(struct wm8994), GFP_KERNEL);
d0a11693	609	if (wm8994 == NULL)
9e501086	610	return -ENOMEM;
9e501086 MB	611
	612	i2c_set_clientdata(i2c, wm8994);
	613	wm8994->dev = &i2c->dev;
c9fbf7e0	614	wm8994->irq = i2c->irq;
559e0df6	615	wm8994->type = id->driver_data;
9e501086	616
34697898	617	wm8994->regmap = regmap_init_i2c(i2c, &wm8994_base_regmap_config);
d6c645fc MB	618	if (IS_ERR(wm8994->regmap)) {
	619	ret = PTR_ERR(wm8994->regmap);
	620	dev_err(wm8994->dev, "Failed to allocate register map: %d\n",
	621	ret);
d6c645fc MB	622	return ret;
	623	}
	624
559e0df6	625	return wm8994_device_init(wm8994, i2c->irq);
9e501086 MB	626	}
	627
	628	static int wm8994_i2c_remove(struct i2c_client *i2c)
	629	{
	630	struct wm8994 *wm8994 = i2c_get_clientdata(i2c);
	631
	632	wm8994_device_exit(wm8994);
	633
	634	return 0;
	635	}
	636
9e501086	637	static const struct i2c_device_id wm8994_i2c_id[] = {
b1f43bf3	638	{ "wm1811", WM1811 },
71d17184	639	{ "wm1811a", WM1811 },
559e0df6 MB	640	{ "wm8994", WM8994 },
559e0df6 MB	641	{ "wm8958", WM8958 },
9e501086 MB	642	{ }
	643	};
	644	MODULE_DEVICE_TABLE(i2c, wm8994_i2c_id);
	645
aad34310 MB	646	static UNIVERSAL_DEV_PM_OPS(wm8994_pm_ops, wm8994_suspend, wm8994_resume,
aad34310 MB	647	NULL);
d450f19e	648
9e501086 MB	649	static struct i2c_driver wm8994_i2c_driver = {
9e501086 MB	650	.driver = {
d450f19e MB	651	.name = "wm8994",
	652	.owner = THIS_MODULE,
	653	.pm = &wm8994_pm_ops,
cf763c2e	654	.of_match_table = wm8994_of_match,
9e501086 MB	655	},
	656	.probe = wm8994_i2c_probe,
	657	.remove = wm8994_i2c_remove,
9e501086 MB	658	.id_table = wm8994_i2c_id,
	659	};
	660
	661	static int __init wm8994_i2c_init(void)
	662	{
	663	int ret;
	664
	665	ret = i2c_add_driver(&wm8994_i2c_driver);
	666	if (ret != 0)
	667	pr_err("Failed to register wm8994 I2C driver: %d\n", ret);
	668
	669	return ret;
	670	}
	671	module_init(wm8994_i2c_init);
	672
	673	static void __exit wm8994_i2c_exit(void)
	674	{
	675	i2c_del_driver(&wm8994_i2c_driver);
	676	}
	677	module_exit(wm8994_i2c_exit);
	678
	679	MODULE_DESCRIPTION("Core support for the WM8994 audio CODEC");
	680	MODULE_LICENSE("GPL");
	681	MODULE_AUTHOR("Mark Brown <broonie@opensource.wolfsonmicro.com>");