drivers/mfd/pmic8901.c - kernel/msm - Gitiles

 /* Copyright (c) 2010-2011, Code Aurora Forum. All rights reserved.
  *
  * This program is free software; you can redistribute it and/or modify
  * it under the terms of the GNU General Public License version 2 and
  * only version 2 as published by the Free Software Foundation.
  *
  * This program is distributed in the hope that it will be useful,
  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  * GNU General Public License for more details.
  */

 #include <linux/interrupt.h>
 #include <linux/platform_device.h>
 #include <linux/slab.h>
 #include <linux/mfd/core.h>
 #include <linux/msm_ssbi.h>
 #include <linux/mfd/pmic8901.h>
 #include <linux/mfd/pm8xxx/core.h>

 /* PMIC8901 Revision */
 #define PM8901_REG_REV			0x002
 #define PM8901_VERSION_MASK		0xF0
 #define PM8901_REVISION_MASK		0x0F
 #define PM8901_VERSION_VALUE		0xF0

 #define REG_IRQ_BASE			0xD5
 #define REG_MPP_BASE			0x27

 #define REG_TEMP_ALRM_CTRL		0x23
 #define REG_TEMP_ALRM_PWM		0x24

 #define SINGLE_IRQ_RESOURCE(_name, _irq) \
 { \
 	.name	= _name, \
 	.start	= _irq, \
 	.end	= _irq, \
 	.flags	= IORESOURCE_IRQ, \
 }

 struct pm8901_chip {
 	struct pm8901_platform_data	pdata;
 	struct device			*dev;
 	struct pm_irq_chip		*irq_chip;
 	struct mfd_cell			*mfd_regulators;
 	u8				revision;
 };

 static int pm8901_readb(const struct device *dev, u16 addr, u8 *val)
 {
 	const struct pm8xxx_drvdata *pm8901_drvdata = dev_get_drvdata(dev);
 	const struct pm8901_chip *pmic = pm8901_drvdata->pm_chip_data;

 	return msm_ssbi_read(pmic->dev->parent, addr, val, 1);
 }

 static int pm8901_writeb(const struct device *dev, u16 addr, u8 val)
 {
 	const struct pm8xxx_drvdata *pm8901_drvdata = dev_get_drvdata(dev);
 	const struct pm8901_chip *pmic = pm8901_drvdata->pm_chip_data;

 	return msm_ssbi_write(pmic->dev->parent, addr, &val, 1);
 }

 static int pm8901_read_buf(const struct device *dev, u16 addr, u8 *buf,
 								int cnt)
 {
 	const struct pm8xxx_drvdata *pm8901_drvdata = dev_get_drvdata(dev);
 	const struct pm8901_chip *pmic = pm8901_drvdata->pm_chip_data;

 	return msm_ssbi_read(pmic->dev->parent, addr, buf, cnt);
 }

 static int pm8901_write_buf(const struct device *dev, u16 addr, u8 *buf,
 								int cnt)
 {
 	const struct pm8xxx_drvdata *pm8901_drvdata = dev_get_drvdata(dev);
 	const struct pm8901_chip *pmic = pm8901_drvdata->pm_chip_data;

 	return msm_ssbi_write(pmic->dev->parent, addr, buf, cnt);
 }

 static int pm8901_read_irq_stat(const struct device *dev, int irq)
 {
 	const struct pm8xxx_drvdata *pm8901_drvdata = dev_get_drvdata(dev);
 	const struct pm8901_chip *pmic = pm8901_drvdata->pm_chip_data;

 	return pm8xxx_get_irq_stat(pmic->irq_chip, irq);

 	return 0;
 }

 static enum pm8xxx_version pm8901_get_version(const struct device *dev)
 {
 	const struct pm8xxx_drvdata *pm8901_drvdata = dev_get_drvdata(dev);
 	const struct pm8901_chip *pmic = pm8901_drvdata->pm_chip_data;
 	enum pm8xxx_version version = -ENODEV;

 	if ((pmic->revision & PM8901_VERSION_MASK) == PM8901_VERSION_VALUE)
 		version = PM8XXX_VERSION_8901;

 	return version;
 }

 static int pm8901_get_revision(const struct device *dev)
 {
 	const struct pm8xxx_drvdata *pm8901_drvdata = dev_get_drvdata(dev);
 	const struct pm8901_chip *pmic = pm8901_drvdata->pm_chip_data;

 	return pmic->revision & PM8901_REVISION_MASK;
 }

 static struct pm8xxx_drvdata pm8901_drvdata = {
 	.pmic_readb		= pm8901_readb,
 	.pmic_writeb		= pm8901_writeb,
 	.pmic_read_buf		= pm8901_read_buf,
 	.pmic_write_buf		= pm8901_write_buf,
 	.pmic_read_irq_stat	= pm8901_read_irq_stat,
 	.pmic_get_version	= pm8901_get_version,
 	.pmic_get_revision	= pm8901_get_revision,
 };

 static struct mfd_cell misc_cell = {
 	.name		= PM8XXX_MISC_DEV_NAME,
 	.id		= 1,
 };

 static struct mfd_cell debugfs_cell = {
 	.name		= "pm8xxx-debug",
 	.id		= 1,
 	.platform_data	= "pm8901-dbg",
 	.pdata_size	= sizeof("pm8901-dbg"),
 };

 static const struct resource thermal_alarm_cell_resources[] = {
 	SINGLE_IRQ_RESOURCE("pm8901_tempstat_irq", PM8901_TEMPSTAT_IRQ),
 	SINGLE_IRQ_RESOURCE("pm8901_overtemp_irq", PM8901_OVERTEMP_IRQ),
 };

 static struct pm8xxx_tm_core_data thermal_alarm_cdata = {
 	.adc_type			= PM8XXX_TM_ADC_NONE,
 	.reg_addr_temp_alarm_ctrl	= REG_TEMP_ALRM_CTRL,
 	.reg_addr_temp_alarm_pwm	= REG_TEMP_ALRM_PWM,
 	.tm_name			= "pm8901_tz",
 	.irq_name_temp_stat		= "pm8901_tempstat_irq",
 	.irq_name_over_temp		= "pm8901_overtemp_irq",
 };

 static struct mfd_cell thermal_alarm_cell = {
 	.name		= PM8XXX_TM_DEV_NAME,
 	.id		= 1,
 	.resources	= thermal_alarm_cell_resources,
 	.num_resources	= ARRAY_SIZE(thermal_alarm_cell_resources),
 	.platform_data	= &thermal_alarm_cdata,
 	.pdata_size	= sizeof(struct pm8xxx_tm_core_data),
 };

 static const struct resource mpp_cell_resources[] = {
 	{
 		.start	= PM8901_IRQ_BLOCK_BIT(PM8901_MPP_BLOCK_START, 0),
 		.end	= PM8901_IRQ_BLOCK_BIT(PM8901_MPP_BLOCK_START, 0)
 			  + PM8901_MPPS - 1,
 		.flags	= IORESOURCE_IRQ,
 	},
 };

 static struct mfd_cell mpp_cell = {
 	.name		= PM8XXX_MPP_DEV_NAME,
 	.id		= 1,
 	.resources	= mpp_cell_resources,
 	.num_resources	= ARRAY_SIZE(mpp_cell_resources),
 };

 static int __devinit
 pm8901_add_subdevices(const struct pm8901_platform_data *pdata,
 				struct pm8901_chip *pmic)
 {
 	int rc = 0, irq_base = 0, i;
 	struct pm_irq_chip *irq_chip;
 	static struct mfd_cell *mfd_regulators;

 	if (pdata->irq_pdata) {
 		pdata->irq_pdata->irq_cdata.nirqs = PM8901_NR_IRQS;
 		pdata->irq_pdata->irq_cdata.base_addr = REG_IRQ_BASE;
 		irq_base = pdata->irq_pdata->irq_base;
 		irq_chip = pm8xxx_irq_init(pmic->dev, pdata->irq_pdata);

 		if (IS_ERR(irq_chip)) {
 			pr_err("Failed to init interrupts ret=%ld\n",
 					PTR_ERR(irq_chip));
 			return PTR_ERR(irq_chip);
 		}
 		pmic->irq_chip = irq_chip;
 	}

 	if (pdata->mpp_pdata) {
 		pdata->mpp_pdata->core_data.nmpps = PM8901_MPPS;
 		pdata->mpp_pdata->core_data.base_addr = REG_MPP_BASE;
 		mpp_cell.platform_data = pdata->mpp_pdata;
 		mpp_cell.pdata_size = sizeof(struct pm8xxx_mpp_platform_data);
 		rc = mfd_add_devices(pmic->dev, 0, &mpp_cell, 1, NULL,
 					irq_base);
 		if (rc) {
 			pr_err("Failed to add mpp subdevice ret=%d\n", rc);
 			goto bail;
 		}
 	}

 	if (pdata->num_regulators > 0 && pdata->regulator_pdatas) {
 		mfd_regulators = kzalloc(sizeof(struct mfd_cell)
 					 * (pdata->num_regulators), GFP_KERNEL);
 		if (!mfd_regulators) {
 			pr_err("Cannot allocate %d bytes for pm8901 regulator "
 				"mfd cells\n", sizeof(struct mfd_cell)
 						* (pdata->num_regulators));
 			rc = -ENOMEM;
 			goto bail;
 		}
 		for (i = 0; i < pdata->num_regulators; i++) {
 			mfd_regulators[i].name = "pm8901-regulator";
 			mfd_regulators[i].id = pdata->regulator_pdatas[i].id;
 			mfd_regulators[i].platform_data =
 				&(pdata->regulator_pdatas[i]);
 			mfd_regulators[i].pdata_size =
 					sizeof(struct pm8901_vreg_pdata);
 		}
 		rc = mfd_add_devices(pmic->dev, 0, mfd_regulators,
 				pdata->num_regulators, NULL, irq_base);
 		if (rc) {
 			pr_err("Failed to add regulator subdevices ret=%d\n",
 				rc);
 			kfree(mfd_regulators);
 			goto bail;
 		}
 		pmic->mfd_regulators = mfd_regulators;
 	}

 	rc = mfd_add_devices(pmic->dev, 0, &thermal_alarm_cell, 1, NULL,
 							irq_base);
 	if (rc) {
 		pr_err("Failed to add thermal alarm subdevice ret=%d\n",
 			rc);
 		goto bail;
 	}

 	rc = mfd_add_devices(pmic->dev, 0, &debugfs_cell, 1, NULL, irq_base);
 	if (rc) {
 		pr_err("Failed to add debugfs subdevice ret=%d\n", rc);
 		goto bail;
 	}

 	if (pdata->misc_pdata) {
 		misc_cell.platform_data = pdata->misc_pdata;
 		misc_cell.pdata_size = sizeof(struct pm8xxx_misc_platform_data);
 		rc = mfd_add_devices(pmic->dev, 0, &misc_cell, 1, NULL,
 				      irq_base);
 		if (rc) {
 			pr_err("Failed to add  misc subdevice ret=%d\n", rc);
 			goto bail;
 		}
 	}

 	return rc;

 bail:
 	if (pmic->irq_chip) {
 		pm8xxx_irq_exit(pmic->irq_chip);
 		pmic->irq_chip = NULL;
 	}
 	return rc;
 }

 static int pm8901_probe(struct platform_device *pdev)
 {
 	int rc;
 	struct pm8901_platform_data *pdata = pdev->dev.platform_data;
 	struct pm8901_chip *pmic;

 	if (pdata == NULL) {
 		pr_err("%s: No platform_data or IRQ.\n", __func__);
 		return -ENODEV;
 	}

 	pmic = kzalloc(sizeof *pmic, GFP_KERNEL);
 	if (pmic == NULL) {
 		pr_err("%s: kzalloc() failed.\n", __func__);
 		return -ENOMEM;
 	}

 	pmic->dev = &pdev->dev;

 	pm8901_drvdata.pm_chip_data = pmic;
 	platform_set_drvdata(pdev, &pm8901_drvdata);

 	/* Read PMIC chip revision */
 	rc = pm8901_readb(pmic->dev, PM8901_REG_REV, &pmic->revision);
 	if (rc)
 		pr_err("%s: Failed reading version register rc=%d.\n",
 			__func__, rc);

 	pr_info("%s: PMIC REVISION = %X\n", __func__, pmic->revision);

 	(void) memcpy((void *)&pmic->pdata, (const void *)pdata,
 		      sizeof(pmic->pdata));

 	rc = pm8901_add_subdevices(pdata, pmic);
 	if (rc) {
 		pr_err("Cannot add subdevices rc=%d\n", rc);
 		goto err;
 	}

 	return 0;

 err:
 	platform_set_drvdata(pdev, NULL);
 	kfree(pmic);
 	return rc;
 }

 static int __devexit pm8901_remove(struct platform_device *pdev)
 {
 	struct pm8xxx_drvdata *drvdata;
 	struct pm8901_chip *pmic = NULL;

 	drvdata = platform_get_drvdata(pdev);
 	if (drvdata)
 		pmic = drvdata->pm_chip_data;
 	if (pmic) {
 		if (pmic->dev)
 			mfd_remove_devices(pmic->dev);
 		if (pmic->irq_chip)
 			pm8xxx_irq_exit(pmic->irq_chip);
 		kfree(pmic->mfd_regulators);
 		kfree(pmic);
 	}
 	platform_set_drvdata(pdev, NULL);

 	return 0;
 }

 static struct platform_driver pm8901_driver = {
 	.probe		= pm8901_probe,
 	.remove		= __devexit_p(pm8901_remove),
 	.driver		= {
 		.name	= "pm8901-core",
 		.owner	= THIS_MODULE,
 	},
 };

 static int __init pm8901_init(void)
 {
 	return  platform_driver_register(&pm8901_driver);
 }
 postcore_initcall(pm8901_init);

 static void __exit pm8901_exit(void)
 {
 	platform_driver_unregister(&pm8901_driver);
 }
 module_exit(pm8901_exit);

 MODULE_LICENSE("GPL v2");
 MODULE_DESCRIPTION("PMIC8901 core driver");
 MODULE_VERSION("1.0");
 MODULE_ALIAS("platform:pmic8901-core");
	/* Copyright (c) 2010-2011, Code Aurora Forum. All rights reserved.
	*
	* This program is free software; you can redistribute it and/or modify
	* it under the terms of the GNU General Public License version 2 and
	* only version 2 as published by the Free Software Foundation.
	*
	* This program is distributed in the hope that it will be useful,
	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	* GNU General Public License for more details.
	*/

	#include <linux/interrupt.h>
	#include <linux/platform_device.h>
	#include <linux/slab.h>
	#include <linux/mfd/core.h>
	#include <linux/msm_ssbi.h>
	#include <linux/mfd/pmic8901.h>
	#include <linux/mfd/pm8xxx/core.h>

	/* PMIC8901 Revision */
	#define PM8901_REG_REV 0x002
	#define PM8901_VERSION_MASK 0xF0
	#define PM8901_REVISION_MASK 0x0F
	#define PM8901_VERSION_VALUE 0xF0

	#define REG_IRQ_BASE 0xD5
	#define REG_MPP_BASE 0x27

	#define REG_TEMP_ALRM_CTRL 0x23
	#define REG_TEMP_ALRM_PWM 0x24

	#define SINGLE_IRQ_RESOURCE(_name, _irq) \
	{ \
	.name = _name, \
	.start = _irq, \
	.end = _irq, \
	.flags = IORESOURCE_IRQ, \
	}

	struct pm8901_chip {
	struct pm8901_platform_data pdata;
	struct device *dev;
	struct pm_irq_chip *irq_chip;
	struct mfd_cell *mfd_regulators;
	u8 revision;
	};

	static int pm8901_readb(const struct device dev, u16 addr, u8 val)
	{
	const struct pm8xxx_drvdata *pm8901_drvdata = dev_get_drvdata(dev);
	const struct pm8901_chip *pmic = pm8901_drvdata->pm_chip_data;

	return msm_ssbi_read(pmic->dev->parent, addr, val, 1);
	}

	static int pm8901_writeb(const struct device *dev, u16 addr, u8 val)
	{
	const struct pm8xxx_drvdata *pm8901_drvdata = dev_get_drvdata(dev);
	const struct pm8901_chip *pmic = pm8901_drvdata->pm_chip_data;

	return msm_ssbi_write(pmic->dev->parent, addr, &val, 1);
	}

	static int pm8901_read_buf(const struct device dev, u16 addr, u8 buf,
	int cnt)
	{
	const struct pm8xxx_drvdata *pm8901_drvdata = dev_get_drvdata(dev);
	const struct pm8901_chip *pmic = pm8901_drvdata->pm_chip_data;

	return msm_ssbi_read(pmic->dev->parent, addr, buf, cnt);
	}

	static int pm8901_write_buf(const struct device dev, u16 addr, u8 buf,
	int cnt)
	{
	const struct pm8xxx_drvdata *pm8901_drvdata = dev_get_drvdata(dev);
	const struct pm8901_chip *pmic = pm8901_drvdata->pm_chip_data;

	return msm_ssbi_write(pmic->dev->parent, addr, buf, cnt);
	}

	static int pm8901_read_irq_stat(const struct device *dev, int irq)
	{
	const struct pm8xxx_drvdata *pm8901_drvdata = dev_get_drvdata(dev);
	const struct pm8901_chip *pmic = pm8901_drvdata->pm_chip_data;

	return pm8xxx_get_irq_stat(pmic->irq_chip, irq);

	return 0;
	}

	static enum pm8xxx_version pm8901_get_version(const struct device *dev)
	{
	const struct pm8xxx_drvdata *pm8901_drvdata = dev_get_drvdata(dev);
	const struct pm8901_chip *pmic = pm8901_drvdata->pm_chip_data;
	enum pm8xxx_version version = -ENODEV;

	if ((pmic->revision & PM8901_VERSION_MASK) == PM8901_VERSION_VALUE)
	version = PM8XXX_VERSION_8901;

	return version;
	}

	static int pm8901_get_revision(const struct device *dev)
	{
	const struct pm8xxx_drvdata *pm8901_drvdata = dev_get_drvdata(dev);
	const struct pm8901_chip *pmic = pm8901_drvdata->pm_chip_data;

	return pmic->revision & PM8901_REVISION_MASK;
	}

	static struct pm8xxx_drvdata pm8901_drvdata = {
	.pmic_readb = pm8901_readb,
	.pmic_writeb = pm8901_writeb,
	.pmic_read_buf = pm8901_read_buf,
	.pmic_write_buf = pm8901_write_buf,
	.pmic_read_irq_stat = pm8901_read_irq_stat,
	.pmic_get_version = pm8901_get_version,
	.pmic_get_revision = pm8901_get_revision,
	};

	static struct mfd_cell misc_cell = {
	.name = PM8XXX_MISC_DEV_NAME,
	.id = 1,
	};

	static struct mfd_cell debugfs_cell = {
	.name = "pm8xxx-debug",
	.id = 1,
	.platform_data = "pm8901-dbg",
	.pdata_size = sizeof("pm8901-dbg"),
	};

	static const struct resource thermal_alarm_cell_resources[] = {
	SINGLE_IRQ_RESOURCE("pm8901_tempstat_irq", PM8901_TEMPSTAT_IRQ),
	SINGLE_IRQ_RESOURCE("pm8901_overtemp_irq", PM8901_OVERTEMP_IRQ),
	};

	static struct pm8xxx_tm_core_data thermal_alarm_cdata = {
	.adc_type = PM8XXX_TM_ADC_NONE,
	.reg_addr_temp_alarm_ctrl = REG_TEMP_ALRM_CTRL,
	.reg_addr_temp_alarm_pwm = REG_TEMP_ALRM_PWM,
	.tm_name = "pm8901_tz",
	.irq_name_temp_stat = "pm8901_tempstat_irq",
	.irq_name_over_temp = "pm8901_overtemp_irq",
	};

	static struct mfd_cell thermal_alarm_cell = {
	.name = PM8XXX_TM_DEV_NAME,
	.id = 1,
	.resources = thermal_alarm_cell_resources,
	.num_resources = ARRAY_SIZE(thermal_alarm_cell_resources),
	.platform_data = &thermal_alarm_cdata,
	.pdata_size = sizeof(struct pm8xxx_tm_core_data),
	};

	static const struct resource mpp_cell_resources[] = {
	{
	.start = PM8901_IRQ_BLOCK_BIT(PM8901_MPP_BLOCK_START, 0),
	.end = PM8901_IRQ_BLOCK_BIT(PM8901_MPP_BLOCK_START, 0)
	+ PM8901_MPPS - 1,
	.flags = IORESOURCE_IRQ,
	},
	};

	static struct mfd_cell mpp_cell = {
	.name = PM8XXX_MPP_DEV_NAME,
	.id = 1,
	.resources = mpp_cell_resources,
	.num_resources = ARRAY_SIZE(mpp_cell_resources),
	};

	static int __devinit
	pm8901_add_subdevices(const struct pm8901_platform_data *pdata,
	struct pm8901_chip *pmic)
	{
	int rc = 0, irq_base = 0, i;
	struct pm_irq_chip *irq_chip;
	static struct mfd_cell *mfd_regulators;

	if (pdata->irq_pdata) {
	pdata->irq_pdata->irq_cdata.nirqs = PM8901_NR_IRQS;
	pdata->irq_pdata->irq_cdata.base_addr = REG_IRQ_BASE;
	irq_base = pdata->irq_pdata->irq_base;
	irq_chip = pm8xxx_irq_init(pmic->dev, pdata->irq_pdata);

	if (IS_ERR(irq_chip)) {
	pr_err("Failed to init interrupts ret=%ld\n",
	PTR_ERR(irq_chip));
	return PTR_ERR(irq_chip);
	}
	pmic->irq_chip = irq_chip;
	}

	if (pdata->mpp_pdata) {
	pdata->mpp_pdata->core_data.nmpps = PM8901_MPPS;
	pdata->mpp_pdata->core_data.base_addr = REG_MPP_BASE;
	mpp_cell.platform_data = pdata->mpp_pdata;
	mpp_cell.pdata_size = sizeof(struct pm8xxx_mpp_platform_data);
	rc = mfd_add_devices(pmic->dev, 0, &mpp_cell, 1, NULL,
	irq_base);
	if (rc) {
	pr_err("Failed to add mpp subdevice ret=%d\n", rc);
	goto bail;
	}
	}

	if (pdata->num_regulators > 0 && pdata->regulator_pdatas) {
	mfd_regulators = kzalloc(sizeof(struct mfd_cell)
	* (pdata->num_regulators), GFP_KERNEL);
	if (!mfd_regulators) {
	pr_err("Cannot allocate %d bytes for pm8901 regulator "
	"mfd cells\n", sizeof(struct mfd_cell)
	* (pdata->num_regulators));
	rc = -ENOMEM;
	goto bail;
	}
	for (i = 0; i < pdata->num_regulators; i++) {
	mfd_regulators[i].name = "pm8901-regulator";
	mfd_regulators[i].id = pdata->regulator_pdatas[i].id;
	mfd_regulators[i].platform_data =
	&(pdata->regulator_pdatas[i]);
	mfd_regulators[i].pdata_size =
	sizeof(struct pm8901_vreg_pdata);
	}
	rc = mfd_add_devices(pmic->dev, 0, mfd_regulators,
	pdata->num_regulators, NULL, irq_base);
	if (rc) {
	pr_err("Failed to add regulator subdevices ret=%d\n",
	rc);
	kfree(mfd_regulators);
	goto bail;
	}
	pmic->mfd_regulators = mfd_regulators;
	}

	rc = mfd_add_devices(pmic->dev, 0, &thermal_alarm_cell, 1, NULL,
	irq_base);
	if (rc) {
	pr_err("Failed to add thermal alarm subdevice ret=%d\n",
	rc);
	goto bail;
	}

	rc = mfd_add_devices(pmic->dev, 0, &debugfs_cell, 1, NULL, irq_base);
	if (rc) {
	pr_err("Failed to add debugfs subdevice ret=%d\n", rc);
	goto bail;
	}

	if (pdata->misc_pdata) {
	misc_cell.platform_data = pdata->misc_pdata;
	misc_cell.pdata_size = sizeof(struct pm8xxx_misc_platform_data);
	rc = mfd_add_devices(pmic->dev, 0, &misc_cell, 1, NULL,
	irq_base);
	if (rc) {
	pr_err("Failed to add misc subdevice ret=%d\n", rc);
	goto bail;
	}
	}

	return rc;

	bail:
	if (pmic->irq_chip) {
	pm8xxx_irq_exit(pmic->irq_chip);
	pmic->irq_chip = NULL;
	}
	return rc;
	}

	static int pm8901_probe(struct platform_device *pdev)
	{
	int rc;
	struct pm8901_platform_data *pdata = pdev->dev.platform_data;
	struct pm8901_chip *pmic;

	if (pdata == NULL) {
	pr_err("%s: No platform_data or IRQ.\n", __func__);
	return -ENODEV;
	}

	pmic = kzalloc(sizeof *pmic, GFP_KERNEL);
	if (pmic == NULL) {
	pr_err("%s: kzalloc() failed.\n", __func__);
	return -ENOMEM;
	}

	pmic->dev = &pdev->dev;

	pm8901_drvdata.pm_chip_data = pmic;
	platform_set_drvdata(pdev, &pm8901_drvdata);

	/* Read PMIC chip revision */
	rc = pm8901_readb(pmic->dev, PM8901_REG_REV, &pmic->revision);
	if (rc)
	pr_err("%s: Failed reading version register rc=%d.\n",
	__func__, rc);

	pr_info("%s: PMIC REVISION = %X\n", __func__, pmic->revision);

	(void) memcpy((void )&pmic->pdata, (const void )pdata,
	sizeof(pmic->pdata));

	rc = pm8901_add_subdevices(pdata, pmic);
	if (rc) {
	pr_err("Cannot add subdevices rc=%d\n", rc);
	goto err;
	}

	return 0;

	err:
	platform_set_drvdata(pdev, NULL);
	kfree(pmic);
	return rc;
	}

	static int __devexit pm8901_remove(struct platform_device *pdev)
	{
	struct pm8xxx_drvdata *drvdata;
	struct pm8901_chip *pmic = NULL;

	drvdata = platform_get_drvdata(pdev);
	if (drvdata)
	pmic = drvdata->pm_chip_data;
	if (pmic) {
	if (pmic->dev)
	mfd_remove_devices(pmic->dev);
	if (pmic->irq_chip)
	pm8xxx_irq_exit(pmic->irq_chip);
	kfree(pmic->mfd_regulators);
	kfree(pmic);
	}
	platform_set_drvdata(pdev, NULL);

	return 0;
	}

	static struct platform_driver pm8901_driver = {
	.probe = pm8901_probe,
	.remove = __devexit_p(pm8901_remove),
	.driver = {
	.name = "pm8901-core",
	.owner = THIS_MODULE,
	},
	};

	static int __init pm8901_init(void)
	{
	return platform_driver_register(&pm8901_driver);
	}
	postcore_initcall(pm8901_init);

	static void __exit pm8901_exit(void)
	{
	platform_driver_unregister(&pm8901_driver);
	}
	module_exit(pm8901_exit);

	MODULE_LICENSE("GPL v2");
	MODULE_DESCRIPTION("PMIC8901 core driver");
	MODULE_VERSION("1.0");
	MODULE_ALIAS("platform:pmic8901-core");