drivers/mfd/wm8350-core.c - kernel/bruno - Git at Google

 /*
  * wm8350-core.c  --  Device access for Wolfson WM8350
  *
  * Copyright 2007, 2008 Wolfson Microelectronics PLC.
  *
  * Author: Liam Girdwood, Mark Brown
  *
  *  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/bug.h>
 #include <linux/device.h>
 #include <linux/delay.h>
 #include <linux/interrupt.h>
 #include <linux/regmap.h>
 #include <linux/workqueue.h>

 #include <linux/mfd/wm8350/core.h>
 #include <linux/mfd/wm8350/audio.h>
 #include <linux/mfd/wm8350/comparator.h>
 #include <linux/mfd/wm8350/gpio.h>
 #include <linux/mfd/wm8350/pmic.h>
 #include <linux/mfd/wm8350/rtc.h>
 #include <linux/mfd/wm8350/supply.h>
 #include <linux/mfd/wm8350/wdt.h>

 #define WM8350_CLOCK_CONTROL_1		0x28
 #define WM8350_AIF_TEST			0x74

 /* debug */
 #define WM8350_BUS_DEBUG 0
 #if WM8350_BUS_DEBUG
 #define dump(regs, src) do { \
 	int i_; \
 	u16 *src_ = src; \
 	printk(KERN_DEBUG); \
 	for (i_ = 0; i_ < regs; i_++) \
 		printk(" 0x%4.4x", *src_++); \
 	printk("\n"); \
 } while (0);
 #else
 #define dump(bytes, src)
 #endif

 #define WM8350_LOCK_DEBUG 0
 #if WM8350_LOCK_DEBUG
 #define ldbg(format, arg...) printk(format, ## arg)
 #else
 #define ldbg(format, arg...)
 #endif

 /*
  * WM8350 Device IO
  */
 static DEFINE_MUTEX(reg_lock_mutex);

 /*
  * Safe read, modify, write methods
  */
 int wm8350_clear_bits(struct wm8350 *wm8350, u16 reg, u16 mask)
 {
 	return regmap_update_bits(wm8350->regmap, reg, mask, 0);
 }
 EXPORT_SYMBOL_GPL(wm8350_clear_bits);

 int wm8350_set_bits(struct wm8350 *wm8350, u16 reg, u16 mask)
 {
 	return regmap_update_bits(wm8350->regmap, reg, mask, mask);
 }
 EXPORT_SYMBOL_GPL(wm8350_set_bits);

 u16 wm8350_reg_read(struct wm8350 *wm8350, int reg)
 {
 	unsigned int data;
 	int err;

 	err = regmap_read(wm8350->regmap, reg, &data);
 	if (err)
 		dev_err(wm8350->dev, "read from reg R%d failed\n", reg);

 	return data;
 }
 EXPORT_SYMBOL_GPL(wm8350_reg_read);

 int wm8350_reg_write(struct wm8350 *wm8350, int reg, u16 val)
 {
 	int ret;

 	ret = regmap_write(wm8350->regmap, reg, val);

 	if (ret)
 		dev_err(wm8350->dev, "write to reg R%d failed\n", reg);
 	return ret;
 }
 EXPORT_SYMBOL_GPL(wm8350_reg_write);

 int wm8350_block_read(struct wm8350 *wm8350, int start_reg, int regs,
 		      u16 *dest)
 {
 	int err = 0;

 	err = regmap_bulk_read(wm8350->regmap, start_reg, dest, regs);
 	if (err)
 		dev_err(wm8350->dev, "block read starting from R%d failed\n",
 			start_reg);

 	return err;
 }
 EXPORT_SYMBOL_GPL(wm8350_block_read);

 int wm8350_block_write(struct wm8350 *wm8350, int start_reg, int regs,
 		       u16 *src)
 {
 	int ret = 0;

 	ret = regmap_bulk_write(wm8350->regmap, start_reg, src, regs);
 	if (ret)
 		dev_err(wm8350->dev, "block write starting at R%d failed\n",
 			start_reg);

 	return ret;
 }
 EXPORT_SYMBOL_GPL(wm8350_block_write);

 /**
  * wm8350_reg_lock()
  *
  * The WM8350 has a hardware lock which can be used to prevent writes to
  * some registers (generally those which can cause particularly serious
  * problems if misused).  This function enables that lock.
  */
 int wm8350_reg_lock(struct wm8350 *wm8350)
 {
 	int ret;

 	mutex_lock(&reg_lock_mutex);

 	ldbg(__func__);

 	ret = wm8350_reg_write(wm8350, WM8350_SECURITY, WM8350_LOCK_KEY);
 	if (ret)
 		dev_err(wm8350->dev, "lock failed\n");

 	wm8350->unlocked = false;

 	mutex_unlock(&reg_lock_mutex);

 	return ret;
 }
 EXPORT_SYMBOL_GPL(wm8350_reg_lock);

 /**
  * wm8350_reg_unlock()
  *
  * The WM8350 has a hardware lock which can be used to prevent writes to
  * some registers (generally those which can cause particularly serious
  * problems if misused).  This function disables that lock so updates
  * can be performed.  For maximum safety this should be done only when
  * required.
  */
 int wm8350_reg_unlock(struct wm8350 *wm8350)
 {
 	int ret;

 	mutex_lock(&reg_lock_mutex);

 	ldbg(__func__);

 	ret = wm8350_reg_write(wm8350, WM8350_SECURITY, WM8350_UNLOCK_KEY);
 	if (ret)
 		dev_err(wm8350->dev, "unlock failed\n");

 	wm8350->unlocked = true;

 	mutex_unlock(&reg_lock_mutex);

 	return ret;
 }
 EXPORT_SYMBOL_GPL(wm8350_reg_unlock);

 int wm8350_read_auxadc(struct wm8350 *wm8350, int channel, int scale, int vref)
 {
 	u16 reg, result = 0;

 	if (channel < WM8350_AUXADC_AUX1 || channel > WM8350_AUXADC_TEMP)
 		return -EINVAL;
 	if (channel >= WM8350_AUXADC_USB && channel <= WM8350_AUXADC_TEMP
 	    && (scale != 0 || vref != 0))
 		return -EINVAL;

 	mutex_lock(&wm8350->auxadc_mutex);

 	/* Turn on the ADC */
 	reg = wm8350_reg_read(wm8350, WM8350_POWER_MGMT_5);
 	wm8350_reg_write(wm8350, WM8350_POWER_MGMT_5, reg | WM8350_AUXADC_ENA);

 	if (scale || vref) {
 		reg = scale << 13;
 		reg |= vref << 12;
 		wm8350_reg_write(wm8350, WM8350_AUX1_READBACK + channel, reg);
 	}

 	reg = wm8350_reg_read(wm8350, WM8350_DIGITISER_CONTROL_1);
 	reg |= 1 << channel | WM8350_AUXADC_POLL;
 	wm8350_reg_write(wm8350, WM8350_DIGITISER_CONTROL_1, reg);

 	/* If a late IRQ left the completion signalled then consume
 	 * the completion. */
 	try_wait_for_completion(&wm8350->auxadc_done);

 	/* We ignore the result of the completion and just check for a
 	 * conversion result, allowing us to soldier on if the IRQ
 	 * infrastructure is not set up for the chip. */
 	wait_for_completion_timeout(&wm8350->auxadc_done, msecs_to_jiffies(5));

 	reg = wm8350_reg_read(wm8350, WM8350_DIGITISER_CONTROL_1);
 	if (reg & WM8350_AUXADC_POLL)
 		dev_err(wm8350->dev, "adc chn %d read timeout\n", channel);
 	else
 		result = wm8350_reg_read(wm8350,
 					 WM8350_AUX1_READBACK + channel);

 	/* Turn off the ADC */
 	reg = wm8350_reg_read(wm8350, WM8350_POWER_MGMT_5);
 	wm8350_reg_write(wm8350, WM8350_POWER_MGMT_5,
 			 reg & ~WM8350_AUXADC_ENA);

 	mutex_unlock(&wm8350->auxadc_mutex);

 	return result & WM8350_AUXADC_DATA1_MASK;
 }
 EXPORT_SYMBOL_GPL(wm8350_read_auxadc);

 static irqreturn_t wm8350_auxadc_irq(int irq, void *irq_data)
 {
 	struct wm8350 *wm8350 = irq_data;

 	complete(&wm8350->auxadc_done);

 	return IRQ_HANDLED;
 }

 /*
  * Register a client device.  This is non-fatal since there is no need to
  * fail the entire device init due to a single platform device failing.
  */
 static void wm8350_client_dev_register(struct wm8350 *wm8350,
 				       const char *name,
 				       struct platform_device **pdev)
 {
 	int ret;

 	*pdev = platform_device_alloc(name, -1);
 	if (*pdev == NULL) {
 		dev_err(wm8350->dev, "Failed to allocate %s\n", name);
 		return;
 	}

 	(*pdev)->dev.parent = wm8350->dev;
 	platform_set_drvdata(*pdev, wm8350);
 	ret = platform_device_add(*pdev);
 	if (ret != 0) {
 		dev_err(wm8350->dev, "Failed to register %s: %d\n", name, ret);
 		platform_device_put(*pdev);
 		*pdev = NULL;
 	}
 }

 int wm8350_device_init(struct wm8350 *wm8350, int irq,
 		       struct wm8350_platform_data *pdata)
 {
 	int ret;
 	unsigned int id1, id2, mask_rev;
 	unsigned int cust_id, mode, chip_rev;

 	dev_set_drvdata(wm8350->dev, wm8350);

 	/* get WM8350 revision and config mode */
 	ret = regmap_read(wm8350->regmap, WM8350_RESET_ID, &id1);
 	if (ret != 0) {
 		dev_err(wm8350->dev, "Failed to read ID: %d\n", ret);
 		goto err;
 	}

 	ret = regmap_read(wm8350->regmap, WM8350_ID, &id2);
 	if (ret != 0) {
 		dev_err(wm8350->dev, "Failed to read ID: %d\n", ret);
 		goto err;
 	}

 	ret = regmap_read(wm8350->regmap, WM8350_REVISION, &mask_rev);
 	if (ret != 0) {
 		dev_err(wm8350->dev, "Failed to read revision: %d\n", ret);
 		goto err;
 	}

 	if (id1 != 0x6143) {
 		dev_err(wm8350->dev,
 			"Device with ID %x is not a WM8350\n", id1);
 		ret = -ENODEV;
 		goto err;
 	}

 	mode = (id2 & WM8350_CONF_STS_MASK) >> 10;
 	cust_id = id2 & WM8350_CUST_ID_MASK;
 	chip_rev = (id2 & WM8350_CHIP_REV_MASK) >> 12;
 	dev_info(wm8350->dev,
 		 "CONF_STS %d, CUST_ID %d, MASK_REV %d, CHIP_REV %d\n",
 		 mode, cust_id, mask_rev, chip_rev);

 	if (cust_id != 0) {
 		dev_err(wm8350->dev, "Unsupported CUST_ID\n");
 		ret = -ENODEV;
 		goto err;
 	}

 	switch (mask_rev) {
 	case 0:
 		wm8350->pmic.max_dcdc = WM8350_DCDC_6;
 		wm8350->pmic.max_isink = WM8350_ISINK_B;

 		switch (chip_rev) {
 		case WM8350_REV_E:
 			dev_info(wm8350->dev, "WM8350 Rev E\n");
 			break;
 		case WM8350_REV_F:
 			dev_info(wm8350->dev, "WM8350 Rev F\n");
 			break;
 		case WM8350_REV_G:
 			dev_info(wm8350->dev, "WM8350 Rev G\n");
 			wm8350->power.rev_g_coeff = 1;
 			break;
 		case WM8350_REV_H:
 			dev_info(wm8350->dev, "WM8350 Rev H\n");
 			wm8350->power.rev_g_coeff = 1;
 			break;
 		default:
 			/* For safety we refuse to run on unknown hardware */
 			dev_err(wm8350->dev, "Unknown WM8350 CHIP_REV\n");
 			ret = -ENODEV;
 			goto err;
 		}
 		break;

 	case 1:
 		wm8350->pmic.max_dcdc = WM8350_DCDC_4;
 		wm8350->pmic.max_isink = WM8350_ISINK_A;

 		switch (chip_rev) {
 		case 0:
 			dev_info(wm8350->dev, "WM8351 Rev A\n");
 			wm8350->power.rev_g_coeff = 1;
 			break;

 		case 1:
 			dev_info(wm8350->dev, "WM8351 Rev B\n");
 			wm8350->power.rev_g_coeff = 1;
 			break;

 		default:
 			dev_err(wm8350->dev, "Unknown WM8351 CHIP_REV\n");
 			ret = -ENODEV;
 			goto err;
 		}
 		break;

 	case 2:
 		wm8350->pmic.max_dcdc = WM8350_DCDC_6;
 		wm8350->pmic.max_isink = WM8350_ISINK_B;

 		switch (chip_rev) {
 		case 0:
 			dev_info(wm8350->dev, "WM8352 Rev A\n");
 			wm8350->power.rev_g_coeff = 1;
 			break;

 		default:
 			dev_err(wm8350->dev, "Unknown WM8352 CHIP_REV\n");
 			ret = -ENODEV;
 			goto err;
 		}
 		break;

 	default:
 		dev_err(wm8350->dev, "Unknown MASK_REV\n");
 		ret = -ENODEV;
 		goto err;
 	}

 	mutex_init(&wm8350->auxadc_mutex);
 	init_completion(&wm8350->auxadc_done);

 	ret = wm8350_irq_init(wm8350, irq, pdata);
 	if (ret < 0)
 		goto err;

 	if (wm8350->irq_base) {
 		ret = request_threaded_irq(wm8350->irq_base +
 					   WM8350_IRQ_AUXADC_DATARDY,
 					   NULL, wm8350_auxadc_irq,
 					   IRQF_ONESHOT,
 					   "auxadc", wm8350);
 		if (ret < 0)
 			dev_warn(wm8350->dev,
 				 "Failed to request AUXADC IRQ: %d\n", ret);
 	}

 	if (pdata && pdata->init) {
 		ret = pdata->init(wm8350);
 		if (ret != 0) {
 			dev_err(wm8350->dev, "Platform init() failed: %d\n",
 				ret);
 			goto err_irq;
 		}
 	}

 	wm8350_reg_write(wm8350, WM8350_SYSTEM_INTERRUPTS_MASK, 0x0);

 	wm8350_client_dev_register(wm8350, "wm8350-codec",
 				   &(wm8350->codec.pdev));
 	wm8350_client_dev_register(wm8350, "wm8350-gpio",
 				   &(wm8350->gpio.pdev));
 	wm8350_client_dev_register(wm8350, "wm8350-hwmon",
 				   &(wm8350->hwmon.pdev));
 	wm8350_client_dev_register(wm8350, "wm8350-power",
 				   &(wm8350->power.pdev));
 	wm8350_client_dev_register(wm8350, "wm8350-rtc", &(wm8350->rtc.pdev));
 	wm8350_client_dev_register(wm8350, "wm8350-wdt", &(wm8350->wdt.pdev));

 	return 0;

 err_irq:
 	wm8350_irq_exit(wm8350);
 err:
 	return ret;
 }
 EXPORT_SYMBOL_GPL(wm8350_device_init);

 void wm8350_device_exit(struct wm8350 *wm8350)
 {
 	int i;

 	for (i = 0; i < ARRAY_SIZE(wm8350->pmic.led); i++)
 		platform_device_unregister(wm8350->pmic.led[i].pdev);

 	for (i = 0; i < ARRAY_SIZE(wm8350->pmic.pdev); i++)
 		platform_device_unregister(wm8350->pmic.pdev[i]);

 	platform_device_unregister(wm8350->wdt.pdev);
 	platform_device_unregister(wm8350->rtc.pdev);
 	platform_device_unregister(wm8350->power.pdev);
 	platform_device_unregister(wm8350->hwmon.pdev);
 	platform_device_unregister(wm8350->gpio.pdev);
 	platform_device_unregister(wm8350->codec.pdev);

 	if (wm8350->irq_base)
 		free_irq(wm8350->irq_base + WM8350_IRQ_AUXADC_DATARDY, wm8350);

 	wm8350_irq_exit(wm8350);
 }
 EXPORT_SYMBOL_GPL(wm8350_device_exit);

 MODULE_DESCRIPTION("WM8350 AudioPlus PMIC core driver");
 MODULE_LICENSE("GPL");
	/*
	* wm8350-core.c -- Device access for Wolfson WM8350
	*
	* Copyright 2007, 2008 Wolfson Microelectronics PLC.
	*
	* Author: Liam Girdwood, Mark Brown
	*
	* 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/bug.h>
	#include <linux/device.h>
	#include <linux/delay.h>
	#include <linux/interrupt.h>
	#include <linux/regmap.h>
	#include <linux/workqueue.h>

	#include <linux/mfd/wm8350/core.h>
	#include <linux/mfd/wm8350/audio.h>
	#include <linux/mfd/wm8350/comparator.h>
	#include <linux/mfd/wm8350/gpio.h>
	#include <linux/mfd/wm8350/pmic.h>
	#include <linux/mfd/wm8350/rtc.h>
	#include <linux/mfd/wm8350/supply.h>
	#include <linux/mfd/wm8350/wdt.h>

	#define WM8350_CLOCK_CONTROL_1 0x28
	#define WM8350_AIF_TEST 0x74

	/* debug */
	#define WM8350_BUS_DEBUG 0
	#if WM8350_BUS_DEBUG
	#define dump(regs, src) do { \
	int i_; \
	u16 *src_ = src; \
	printk(KERN_DEBUG); \
	for (i_ = 0; i_ < regs; i_++) \
	printk(" 0x%4.4x", *src_++); \
	printk("\n"); \
	} while (0);
	#else
	#define dump(bytes, src)
	#endif

	#define WM8350_LOCK_DEBUG 0
	#if WM8350_LOCK_DEBUG
	#define ldbg(format, arg...) printk(format, ## arg)
	#else
	#define ldbg(format, arg...)
	#endif

	/*
	* WM8350 Device IO
	*/
	static DEFINE_MUTEX(reg_lock_mutex);

	/*
	* Safe read, modify, write methods
	*/
	int wm8350_clear_bits(struct wm8350 *wm8350, u16 reg, u16 mask)
	{
	return regmap_update_bits(wm8350->regmap, reg, mask, 0);
	}
	EXPORT_SYMBOL_GPL(wm8350_clear_bits);

	int wm8350_set_bits(struct wm8350 *wm8350, u16 reg, u16 mask)
	{
	return regmap_update_bits(wm8350->regmap, reg, mask, mask);
	}
	EXPORT_SYMBOL_GPL(wm8350_set_bits);

	u16 wm8350_reg_read(struct wm8350 *wm8350, int reg)
	{
	unsigned int data;
	int err;

	err = regmap_read(wm8350->regmap, reg, &data);
	if (err)
	dev_err(wm8350->dev, "read from reg R%d failed\n", reg);

	return data;
	}
	EXPORT_SYMBOL_GPL(wm8350_reg_read);

	int wm8350_reg_write(struct wm8350 *wm8350, int reg, u16 val)
	{
	int ret;

	ret = regmap_write(wm8350->regmap, reg, val);

	if (ret)
	dev_err(wm8350->dev, "write to reg R%d failed\n", reg);
	return ret;
	}
	EXPORT_SYMBOL_GPL(wm8350_reg_write);

	int wm8350_block_read(struct wm8350 *wm8350, int start_reg, int regs,
	u16 *dest)
	{
	int err = 0;

	err = regmap_bulk_read(wm8350->regmap, start_reg, dest, regs);
	if (err)
	dev_err(wm8350->dev, "block read starting from R%d failed\n",
	start_reg);

	return err;
	}
	EXPORT_SYMBOL_GPL(wm8350_block_read);

	int wm8350_block_write(struct wm8350 *wm8350, int start_reg, int regs,
	u16 *src)
	{
	int ret = 0;

	ret = regmap_bulk_write(wm8350->regmap, start_reg, src, regs);
	if (ret)
	dev_err(wm8350->dev, "block write starting at R%d failed\n",
	start_reg);

	return ret;
	}
	EXPORT_SYMBOL_GPL(wm8350_block_write);

	/**
	* wm8350_reg_lock()
	*
	* The WM8350 has a hardware lock which can be used to prevent writes to
	* some registers (generally those which can cause particularly serious
	* problems if misused). This function enables that lock.
	*/
	int wm8350_reg_lock(struct wm8350 *wm8350)
	{
	int ret;

	mutex_lock(&reg_lock_mutex);

	ldbg(__func__);

	ret = wm8350_reg_write(wm8350, WM8350_SECURITY, WM8350_LOCK_KEY);
	if (ret)
	dev_err(wm8350->dev, "lock failed\n");

	wm8350->unlocked = false;

	mutex_unlock(&reg_lock_mutex);

	return ret;
	}
	EXPORT_SYMBOL_GPL(wm8350_reg_lock);

	/**
	* wm8350_reg_unlock()
	*
	* The WM8350 has a hardware lock which can be used to prevent writes to
	* some registers (generally those which can cause particularly serious
	* problems if misused). This function disables that lock so updates
	* can be performed. For maximum safety this should be done only when
	* required.
	*/
	int wm8350_reg_unlock(struct wm8350 *wm8350)
	{
	int ret;

	mutex_lock(&reg_lock_mutex);

	ldbg(__func__);

	ret = wm8350_reg_write(wm8350, WM8350_SECURITY, WM8350_UNLOCK_KEY);
	if (ret)
	dev_err(wm8350->dev, "unlock failed\n");

	wm8350->unlocked = true;

	mutex_unlock(&reg_lock_mutex);

	return ret;
	}
	EXPORT_SYMBOL_GPL(wm8350_reg_unlock);

	int wm8350_read_auxadc(struct wm8350 *wm8350, int channel, int scale, int vref)
	{
	u16 reg, result = 0;

	if (channel < WM8350_AUXADC_AUX1 \|\| channel > WM8350_AUXADC_TEMP)
	return -EINVAL;
	if (channel >= WM8350_AUXADC_USB && channel <= WM8350_AUXADC_TEMP
	&& (scale != 0 \|\| vref != 0))
	return -EINVAL;

	mutex_lock(&wm8350->auxadc_mutex);

	/* Turn on the ADC */
	reg = wm8350_reg_read(wm8350, WM8350_POWER_MGMT_5);
	wm8350_reg_write(wm8350, WM8350_POWER_MGMT_5, reg \| WM8350_AUXADC_ENA);

	if (scale \|\| vref) {
	reg = scale << 13;
	reg \|= vref << 12;
	wm8350_reg_write(wm8350, WM8350_AUX1_READBACK + channel, reg);
	}

	reg = wm8350_reg_read(wm8350, WM8350_DIGITISER_CONTROL_1);
	reg \|= 1 << channel \| WM8350_AUXADC_POLL;
	wm8350_reg_write(wm8350, WM8350_DIGITISER_CONTROL_1, reg);

	/* If a late IRQ left the completion signalled then consume
	* the completion. */
	try_wait_for_completion(&wm8350->auxadc_done);

	/* We ignore the result of the completion and just check for a
	* conversion result, allowing us to soldier on if the IRQ
	* infrastructure is not set up for the chip. */
	wait_for_completion_timeout(&wm8350->auxadc_done, msecs_to_jiffies(5));

	reg = wm8350_reg_read(wm8350, WM8350_DIGITISER_CONTROL_1);
	if (reg & WM8350_AUXADC_POLL)
	dev_err(wm8350->dev, "adc chn %d read timeout\n", channel);
	else
	result = wm8350_reg_read(wm8350,
	WM8350_AUX1_READBACK + channel);

	/* Turn off the ADC */
	reg = wm8350_reg_read(wm8350, WM8350_POWER_MGMT_5);
	wm8350_reg_write(wm8350, WM8350_POWER_MGMT_5,
	reg & ~WM8350_AUXADC_ENA);

	mutex_unlock(&wm8350->auxadc_mutex);

	return result & WM8350_AUXADC_DATA1_MASK;
	}
	EXPORT_SYMBOL_GPL(wm8350_read_auxadc);

	static irqreturn_t wm8350_auxadc_irq(int irq, void *irq_data)
	{
	struct wm8350 *wm8350 = irq_data;

	complete(&wm8350->auxadc_done);

	return IRQ_HANDLED;
	}

	/*
	* Register a client device. This is non-fatal since there is no need to
	* fail the entire device init due to a single platform device failing.
	*/
	static void wm8350_client_dev_register(struct wm8350 *wm8350,
	const char *name,
	struct platform_device **pdev)
	{
	int ret;

	*pdev = platform_device_alloc(name, -1);
	if (*pdev == NULL) {
	dev_err(wm8350->dev, "Failed to allocate %s\n", name);
	return;
	}

	(*pdev)->dev.parent = wm8350->dev;
	platform_set_drvdata(*pdev, wm8350);
	ret = platform_device_add(*pdev);
	if (ret != 0) {
	dev_err(wm8350->dev, "Failed to register %s: %d\n", name, ret);
	platform_device_put(*pdev);
	*pdev = NULL;
	}
	}

	int wm8350_device_init(struct wm8350 *wm8350, int irq,
	struct wm8350_platform_data *pdata)
	{
	int ret;
	unsigned int id1, id2, mask_rev;
	unsigned int cust_id, mode, chip_rev;

	dev_set_drvdata(wm8350->dev, wm8350);

	/* get WM8350 revision and config mode */
	ret = regmap_read(wm8350->regmap, WM8350_RESET_ID, &id1);
	if (ret != 0) {
	dev_err(wm8350->dev, "Failed to read ID: %d\n", ret);
	goto err;
	}

	ret = regmap_read(wm8350->regmap, WM8350_ID, &id2);
	if (ret != 0) {
	dev_err(wm8350->dev, "Failed to read ID: %d\n", ret);
	goto err;
	}

	ret = regmap_read(wm8350->regmap, WM8350_REVISION, &mask_rev);
	if (ret != 0) {
	dev_err(wm8350->dev, "Failed to read revision: %d\n", ret);
	goto err;
	}

	if (id1 != 0x6143) {
	dev_err(wm8350->dev,
	"Device with ID %x is not a WM8350\n", id1);
	ret = -ENODEV;
	goto err;
	}

	mode = (id2 & WM8350_CONF_STS_MASK) >> 10;
	cust_id = id2 & WM8350_CUST_ID_MASK;
	chip_rev = (id2 & WM8350_CHIP_REV_MASK) >> 12;
	dev_info(wm8350->dev,
	"CONF_STS %d, CUST_ID %d, MASK_REV %d, CHIP_REV %d\n",
	mode, cust_id, mask_rev, chip_rev);

	if (cust_id != 0) {
	dev_err(wm8350->dev, "Unsupported CUST_ID\n");
	ret = -ENODEV;
	goto err;
	}

	switch (mask_rev) {
	case 0:
	wm8350->pmic.max_dcdc = WM8350_DCDC_6;
	wm8350->pmic.max_isink = WM8350_ISINK_B;

	switch (chip_rev) {
	case WM8350_REV_E:
	dev_info(wm8350->dev, "WM8350 Rev E\n");
	break;
	case WM8350_REV_F:
	dev_info(wm8350->dev, "WM8350 Rev F\n");
	break;
	case WM8350_REV_G:
	dev_info(wm8350->dev, "WM8350 Rev G\n");
	wm8350->power.rev_g_coeff = 1;
	break;
	case WM8350_REV_H:
	dev_info(wm8350->dev, "WM8350 Rev H\n");
	wm8350->power.rev_g_coeff = 1;
	break;
	default:
	/* For safety we refuse to run on unknown hardware */
	dev_err(wm8350->dev, "Unknown WM8350 CHIP_REV\n");
	ret = -ENODEV;
	goto err;
	}
	break;

	case 1:
	wm8350->pmic.max_dcdc = WM8350_DCDC_4;
	wm8350->pmic.max_isink = WM8350_ISINK_A;

	switch (chip_rev) {
	case 0:
	dev_info(wm8350->dev, "WM8351 Rev A\n");
	wm8350->power.rev_g_coeff = 1;
	break;

	case 1:
	dev_info(wm8350->dev, "WM8351 Rev B\n");
	wm8350->power.rev_g_coeff = 1;
	break;

	default:
	dev_err(wm8350->dev, "Unknown WM8351 CHIP_REV\n");
	ret = -ENODEV;
	goto err;
	}
	break;

	case 2:
	wm8350->pmic.max_dcdc = WM8350_DCDC_6;
	wm8350->pmic.max_isink = WM8350_ISINK_B;

	switch (chip_rev) {
	case 0:
	dev_info(wm8350->dev, "WM8352 Rev A\n");
	wm8350->power.rev_g_coeff = 1;
	break;

	default:
	dev_err(wm8350->dev, "Unknown WM8352 CHIP_REV\n");
	ret = -ENODEV;
	goto err;
	}
	break;

	default:
	dev_err(wm8350->dev, "Unknown MASK_REV\n");
	ret = -ENODEV;
	goto err;
	}

	mutex_init(&wm8350->auxadc_mutex);
	init_completion(&wm8350->auxadc_done);

	ret = wm8350_irq_init(wm8350, irq, pdata);
	if (ret < 0)
	goto err;

	if (wm8350->irq_base) {
	ret = request_threaded_irq(wm8350->irq_base +
	WM8350_IRQ_AUXADC_DATARDY,
	NULL, wm8350_auxadc_irq,
	IRQF_ONESHOT,
	"auxadc", wm8350);
	if (ret < 0)
	dev_warn(wm8350->dev,
	"Failed to request AUXADC IRQ: %d\n", ret);
	}

	if (pdata && pdata->init) {
	ret = pdata->init(wm8350);
	if (ret != 0) {
	dev_err(wm8350->dev, "Platform init() failed: %d\n",
	ret);
	goto err_irq;
	}
	}

	wm8350_reg_write(wm8350, WM8350_SYSTEM_INTERRUPTS_MASK, 0x0);

	wm8350_client_dev_register(wm8350, "wm8350-codec",
	&(wm8350->codec.pdev));
	wm8350_client_dev_register(wm8350, "wm8350-gpio",
	&(wm8350->gpio.pdev));
	wm8350_client_dev_register(wm8350, "wm8350-hwmon",
	&(wm8350->hwmon.pdev));
	wm8350_client_dev_register(wm8350, "wm8350-power",
	&(wm8350->power.pdev));
	wm8350_client_dev_register(wm8350, "wm8350-rtc", &(wm8350->rtc.pdev));
	wm8350_client_dev_register(wm8350, "wm8350-wdt", &(wm8350->wdt.pdev));

	return 0;

	err_irq:
	wm8350_irq_exit(wm8350);
	err:
	return ret;
	}
	EXPORT_SYMBOL_GPL(wm8350_device_init);

	void wm8350_device_exit(struct wm8350 *wm8350)
	{
	int i;

	for (i = 0; i < ARRAY_SIZE(wm8350->pmic.led); i++)
	platform_device_unregister(wm8350->pmic.led[i].pdev);

	for (i = 0; i < ARRAY_SIZE(wm8350->pmic.pdev); i++)
	platform_device_unregister(wm8350->pmic.pdev[i]);

	platform_device_unregister(wm8350->wdt.pdev);
	platform_device_unregister(wm8350->rtc.pdev);
	platform_device_unregister(wm8350->power.pdev);
	platform_device_unregister(wm8350->hwmon.pdev);
	platform_device_unregister(wm8350->gpio.pdev);
	platform_device_unregister(wm8350->codec.pdev);

	if (wm8350->irq_base)
	free_irq(wm8350->irq_base + WM8350_IRQ_AUXADC_DATARDY, wm8350);

	wm8350_irq_exit(wm8350);
	}
	EXPORT_SYMBOL_GPL(wm8350_device_exit);

	MODULE_DESCRIPTION("WM8350 AudioPlus PMIC core driver");
	MODULE_LICENSE("GPL");