drivers/mfd/tc3589x.c - linux - Git at Google

 /*
  * Copyright (C) ST-Ericsson SA 2010
  *
  * License Terms: GNU General Public License, version 2
  * Author: Hanumath Prasad <hanumath.prasad@stericsson.com> for ST-Ericsson
  * Author: Rabin Vincent <rabin.vincent@stericsson.com> for ST-Ericsson
  */

 #include <linux/module.h>
 #include <linux/interrupt.h>
 #include <linux/irq.h>
 #include <linux/irqdomain.h>
 #include <linux/slab.h>
 #include <linux/i2c.h>
 #include <linux/of.h>
 #include <linux/mfd/core.h>
 #include <linux/mfd/tc3589x.h>

 /**
  * enum tc3589x_version - indicates the TC3589x version
  */
 enum tc3589x_version {
 	TC3589X_TC35890,
 	TC3589X_TC35892,
 	TC3589X_TC35893,
 	TC3589X_TC35894,
 	TC3589X_TC35895,
 	TC3589X_TC35896,
 	TC3589X_UNKNOWN,
 };

 #define TC3589x_CLKMODE_MODCTL_SLEEP		0x0
 #define TC3589x_CLKMODE_MODCTL_OPERATION	(1 << 0)

 /**
  * tc3589x_reg_read() - read a single TC3589x register
  * @tc3589x:	Device to read from
  * @reg:	Register to read
  */
 int tc3589x_reg_read(struct tc3589x *tc3589x, u8 reg)
 {
 	int ret;

 	ret = i2c_smbus_read_byte_data(tc3589x->i2c, reg);
 	if (ret < 0)
 		dev_err(tc3589x->dev, "failed to read reg %#x: %d\n",
 			reg, ret);

 	return ret;
 }
 EXPORT_SYMBOL_GPL(tc3589x_reg_read);

 /**
  * tc3589x_reg_read() - write a single TC3589x register
  * @tc3589x:	Device to write to
  * @reg:	Register to read
  * @data:	Value to write
  */
 int tc3589x_reg_write(struct tc3589x *tc3589x, u8 reg, u8 data)
 {
 	int ret;

 	ret = i2c_smbus_write_byte_data(tc3589x->i2c, reg, data);
 	if (ret < 0)
 		dev_err(tc3589x->dev, "failed to write reg %#x: %d\n",
 			reg, ret);

 	return ret;
 }
 EXPORT_SYMBOL_GPL(tc3589x_reg_write);

 /**
  * tc3589x_block_read() - read multiple TC3589x registers
  * @tc3589x:	Device to read from
  * @reg:	First register
  * @length:	Number of registers
  * @values:	Buffer to write to
  */
 int tc3589x_block_read(struct tc3589x *tc3589x, u8 reg, u8 length, u8 *values)
 {
 	int ret;

 	ret = i2c_smbus_read_i2c_block_data(tc3589x->i2c, reg, length, values);
 	if (ret < 0)
 		dev_err(tc3589x->dev, "failed to read regs %#x: %d\n",
 			reg, ret);

 	return ret;
 }
 EXPORT_SYMBOL_GPL(tc3589x_block_read);

 /**
  * tc3589x_block_write() - write multiple TC3589x registers
  * @tc3589x:	Device to write to
  * @reg:	First register
  * @length:	Number of registers
  * @values:	Values to write
  */
 int tc3589x_block_write(struct tc3589x *tc3589x, u8 reg, u8 length,
 			const u8 *values)
 {
 	int ret;

 	ret = i2c_smbus_write_i2c_block_data(tc3589x->i2c, reg, length,
 					     values);
 	if (ret < 0)
 		dev_err(tc3589x->dev, "failed to write regs %#x: %d\n",
 			reg, ret);

 	return ret;
 }
 EXPORT_SYMBOL_GPL(tc3589x_block_write);

 /**
  * tc3589x_set_bits() - set the value of a bitfield in a TC3589x register
  * @tc3589x:	Device to write to
  * @reg:	Register to write
  * @mask:	Mask of bits to set
  * @values:	Value to set
  */
 int tc3589x_set_bits(struct tc3589x *tc3589x, u8 reg, u8 mask, u8 val)
 {
 	int ret;

 	mutex_lock(&tc3589x->lock);

 	ret = tc3589x_reg_read(tc3589x, reg);
 	if (ret < 0)
 		goto out;

 	ret &= ~mask;
 	ret |= val;

 	ret = tc3589x_reg_write(tc3589x, reg, ret);

 out:
 	mutex_unlock(&tc3589x->lock);
 	return ret;
 }
 EXPORT_SYMBOL_GPL(tc3589x_set_bits);

 static struct resource gpio_resources[] = {
 	{
 		.start	= TC3589x_INT_GPIIRQ,
 		.end	= TC3589x_INT_GPIIRQ,
 		.flags	= IORESOURCE_IRQ,
 	},
 };

 static struct resource keypad_resources[] = {
 	{
 		.start  = TC3589x_INT_KBDIRQ,
 		.end    = TC3589x_INT_KBDIRQ,
 		.flags  = IORESOURCE_IRQ,
 	},
 };

 static struct mfd_cell tc3589x_dev_gpio[] = {
 	{
 		.name		= "tc3589x-gpio",
 		.num_resources	= ARRAY_SIZE(gpio_resources),
 		.resources	= &gpio_resources[0],
 		.of_compatible	= "tc3589x-gpio",
 	},
 };

 static struct mfd_cell tc3589x_dev_keypad[] = {
 	{
 		.name           = "tc3589x-keypad",
 		.num_resources  = ARRAY_SIZE(keypad_resources),
 		.resources      = &keypad_resources[0],
 		.of_compatible	= "tc3589x-keypad",
 	},
 };

 static irqreturn_t tc3589x_irq(int irq, void *data)
 {
 	struct tc3589x *tc3589x = data;
 	int status;

 again:
 	status = tc3589x_reg_read(tc3589x, TC3589x_IRQST);
 	if (status < 0)
 		return IRQ_NONE;

 	while (status) {
 		int bit = __ffs(status);
 		int virq = irq_create_mapping(tc3589x->domain, bit);

 		handle_nested_irq(virq);
 		status &= ~(1 << bit);
 	}

 	/*
 	 * A dummy read or write (to any register) appears to be necessary to
 	 * have the last interrupt clear (for example, GPIO IC write) take
 	 * effect. In such a case, recheck for any interrupt which is still
 	 * pending.
 	 */
 	status = tc3589x_reg_read(tc3589x, TC3589x_IRQST);
 	if (status)
 		goto again;

 	return IRQ_HANDLED;
 }

 static int tc3589x_irq_map(struct irq_domain *d, unsigned int virq,
 				irq_hw_number_t hwirq)
 {
 	struct tc3589x *tc3589x = d->host_data;

 	irq_set_chip_data(virq, tc3589x);
 	irq_set_chip_and_handler(virq, &dummy_irq_chip,
 				handle_edge_irq);
 	irq_set_nested_thread(virq, 1);
 #ifdef CONFIG_ARM
 	set_irq_flags(virq, IRQF_VALID);
 #else
 	irq_set_noprobe(virq);
 #endif

 	return 0;
 }

 static void tc3589x_irq_unmap(struct irq_domain *d, unsigned int virq)
 {
 #ifdef CONFIG_ARM
 	set_irq_flags(virq, 0);
 #endif
 	irq_set_chip_and_handler(virq, NULL, NULL);
 	irq_set_chip_data(virq, NULL);
 }

 static struct irq_domain_ops tc3589x_irq_ops = {
 	.map    = tc3589x_irq_map,
 	.unmap  = tc3589x_irq_unmap,
 	.xlate  = irq_domain_xlate_twocell,
 };

 static int tc3589x_irq_init(struct tc3589x *tc3589x, struct device_node *np)
 {
 	int base = tc3589x->irq_base;

 	tc3589x->domain = irq_domain_add_simple(
 		np, TC3589x_NR_INTERNAL_IRQS, base,
 		&tc3589x_irq_ops, tc3589x);

 	if (!tc3589x->domain) {
 		dev_err(tc3589x->dev, "Failed to create irqdomain\n");
 		return -ENOSYS;
 	}

 	return 0;
 }

 static int tc3589x_chip_init(struct tc3589x *tc3589x)
 {
 	int manf, ver, ret;

 	manf = tc3589x_reg_read(tc3589x, TC3589x_MANFCODE);
 	if (manf < 0)
 		return manf;

 	ver = tc3589x_reg_read(tc3589x, TC3589x_VERSION);
 	if (ver < 0)
 		return ver;

 	if (manf != TC3589x_MANFCODE_MAGIC) {
 		dev_err(tc3589x->dev, "unknown manufacturer: %#x\n", manf);
 		return -EINVAL;
 	}

 	dev_info(tc3589x->dev, "manufacturer: %#x, version: %#x\n", manf, ver);

 	/*
 	 * Put everything except the IRQ module into reset;
 	 * also spare the GPIO module for any pin initialization
 	 * done during pre-kernel boot
 	 */
 	ret = tc3589x_reg_write(tc3589x, TC3589x_RSTCTRL,
 				TC3589x_RSTCTRL_TIMRST
 				| TC3589x_RSTCTRL_ROTRST
 				| TC3589x_RSTCTRL_KBDRST);
 	if (ret < 0)
 		return ret;

 	/* Clear the reset interrupt. */
 	return tc3589x_reg_write(tc3589x, TC3589x_RSTINTCLR, 0x1);
 }

 static int tc3589x_device_init(struct tc3589x *tc3589x)
 {
 	int ret = 0;
 	unsigned int blocks = tc3589x->pdata->block;

 	if (blocks & TC3589x_BLOCK_GPIO) {
 		ret = mfd_add_devices(tc3589x->dev, -1, tc3589x_dev_gpio,
 				      ARRAY_SIZE(tc3589x_dev_gpio), NULL,
 				      tc3589x->irq_base, tc3589x->domain);
 		if (ret) {
 			dev_err(tc3589x->dev, "failed to add gpio child\n");
 			return ret;
 		}
 		dev_info(tc3589x->dev, "added gpio block\n");
 	}

 	if (blocks & TC3589x_BLOCK_KEYPAD) {
 		ret = mfd_add_devices(tc3589x->dev, -1, tc3589x_dev_keypad,
 				      ARRAY_SIZE(tc3589x_dev_keypad), NULL,
 				      tc3589x->irq_base, tc3589x->domain);
 		if (ret) {
 			dev_err(tc3589x->dev, "failed to keypad child\n");
 			return ret;
 		}
 		dev_info(tc3589x->dev, "added keypad block\n");
 	}

 	return ret;
 }

 static int tc3589x_of_probe(struct device_node *np,
 			struct tc3589x_platform_data *pdata)
 {
 	struct device_node *child;

 	for_each_child_of_node(np, child) {
 		if (!strcmp(child->name, "tc3589x_gpio")) {
 			pdata->block |= TC3589x_BLOCK_GPIO;
 		}
 		if (!strcmp(child->name, "tc3589x_keypad")) {
 			pdata->block |= TC3589x_BLOCK_KEYPAD;
 		}
 	}

 	return 0;
 }

 static int tc3589x_probe(struct i2c_client *i2c,
 				   const struct i2c_device_id *id)
 {
 	struct tc3589x_platform_data *pdata = dev_get_platdata(&i2c->dev);
 	struct device_node *np = i2c->dev.of_node;
 	struct tc3589x *tc3589x;
 	int ret;

 	if (!pdata) {
 		if (np) {
 			pdata = devm_kzalloc(&i2c->dev, sizeof(*pdata), GFP_KERNEL);
 			if (!pdata)
 				return -ENOMEM;

 			ret = tc3589x_of_probe(np, pdata);
 			if (ret)
 				return ret;
 		}
 		else {
 			dev_err(&i2c->dev, "No platform data or DT found\n");
 			return -EINVAL;
 		}
 	}

 	if (!i2c_check_functionality(i2c->adapter, I2C_FUNC_SMBUS_BYTE_DATA
 				     | I2C_FUNC_SMBUS_I2C_BLOCK))
 		return -EIO;

 	tc3589x = devm_kzalloc(&i2c->dev, sizeof(struct tc3589x),
 				GFP_KERNEL);
 	if (!tc3589x)
 		return -ENOMEM;

 	mutex_init(&tc3589x->lock);

 	tc3589x->dev = &i2c->dev;
 	tc3589x->i2c = i2c;
 	tc3589x->pdata = pdata;
 	tc3589x->irq_base = pdata->irq_base;

 	switch (id->driver_data) {
 	case TC3589X_TC35893:
 	case TC3589X_TC35895:
 	case TC3589X_TC35896:
 		tc3589x->num_gpio = 20;
 		break;
 	case TC3589X_TC35890:
 	case TC3589X_TC35892:
 	case TC3589X_TC35894:
 	case TC3589X_UNKNOWN:
 	default:
 		tc3589x->num_gpio = 24;
 		break;
 	}

 	i2c_set_clientdata(i2c, tc3589x);

 	ret = tc3589x_chip_init(tc3589x);
 	if (ret)
 		return ret;

 	ret = tc3589x_irq_init(tc3589x, np);
 	if (ret)
 		return ret;

 	ret = request_threaded_irq(tc3589x->i2c->irq, NULL, tc3589x_irq,
 				   IRQF_TRIGGER_FALLING | IRQF_ONESHOT,
 				   "tc3589x", tc3589x);
 	if (ret) {
 		dev_err(tc3589x->dev, "failed to request IRQ: %d\n", ret);
 		return ret;
 	}

 	ret = tc3589x_device_init(tc3589x);
 	if (ret) {
 		dev_err(tc3589x->dev, "failed to add child devices\n");
 		return ret;
 	}

 	return 0;
 }

 static int tc3589x_remove(struct i2c_client *client)
 {
 	struct tc3589x *tc3589x = i2c_get_clientdata(client);

 	mfd_remove_devices(tc3589x->dev);

 	return 0;
 }

 #ifdef CONFIG_PM_SLEEP
 static int tc3589x_suspend(struct device *dev)
 {
 	struct tc3589x *tc3589x = dev_get_drvdata(dev);
 	struct i2c_client *client = tc3589x->i2c;
 	int ret = 0;

 	/* put the system to sleep mode */
 	if (!device_may_wakeup(&client->dev))
 		ret = tc3589x_reg_write(tc3589x, TC3589x_CLKMODE,
 				TC3589x_CLKMODE_MODCTL_SLEEP);

 	return ret;
 }

 static int tc3589x_resume(struct device *dev)
 {
 	struct tc3589x *tc3589x = dev_get_drvdata(dev);
 	struct i2c_client *client = tc3589x->i2c;
 	int ret = 0;

 	/* enable the system into operation */
 	if (!device_may_wakeup(&client->dev))
 		ret = tc3589x_reg_write(tc3589x, TC3589x_CLKMODE,
 				TC3589x_CLKMODE_MODCTL_OPERATION);

 	return ret;
 }
 #endif

 static SIMPLE_DEV_PM_OPS(tc3589x_dev_pm_ops, tc3589x_suspend, tc3589x_resume);

 static const struct i2c_device_id tc3589x_id[] = {
 	{ "tc35890", TC3589X_TC35890 },
 	{ "tc35892", TC3589X_TC35892 },
 	{ "tc35893", TC3589X_TC35893 },
 	{ "tc35894", TC3589X_TC35894 },
 	{ "tc35895", TC3589X_TC35895 },
 	{ "tc35896", TC3589X_TC35896 },
 	{ "tc3589x", TC3589X_UNKNOWN },
 	{ }
 };
 MODULE_DEVICE_TABLE(i2c, tc3589x_id);

 static struct i2c_driver tc3589x_driver = {
 	.driver.name	= "tc3589x",
 	.driver.owner	= THIS_MODULE,
 	.driver.pm	= &tc3589x_dev_pm_ops,
 	.probe		= tc3589x_probe,
 	.remove		= tc3589x_remove,
 	.id_table	= tc3589x_id,
 };

 static int __init tc3589x_init(void)
 {
 	return i2c_add_driver(&tc3589x_driver);
 }
 subsys_initcall(tc3589x_init);

 static void __exit tc3589x_exit(void)
 {
 	i2c_del_driver(&tc3589x_driver);
 }
 module_exit(tc3589x_exit);

 MODULE_LICENSE("GPL v2");
 MODULE_DESCRIPTION("TC3589x MFD core driver");
 MODULE_AUTHOR("Hanumath Prasad, Rabin Vincent");
	/*
	* Copyright (C) ST-Ericsson SA 2010
	*
	* License Terms: GNU General Public License, version 2
	* Author: Hanumath Prasad <hanumath.prasad@stericsson.com> for ST-Ericsson
	* Author: Rabin Vincent <rabin.vincent@stericsson.com> for ST-Ericsson
	*/

	#include <linux/module.h>
	#include <linux/interrupt.h>
	#include <linux/irq.h>
	#include <linux/irqdomain.h>
	#include <linux/slab.h>
	#include <linux/i2c.h>
	#include <linux/of.h>
	#include <linux/mfd/core.h>
	#include <linux/mfd/tc3589x.h>

	/**
	* enum tc3589x_version - indicates the TC3589x version
	*/
	enum tc3589x_version {
	TC3589X_TC35890,
	TC3589X_TC35892,
	TC3589X_TC35893,
	TC3589X_TC35894,
	TC3589X_TC35895,
	TC3589X_TC35896,
	TC3589X_UNKNOWN,
	};

	#define TC3589x_CLKMODE_MODCTL_SLEEP 0x0
	#define TC3589x_CLKMODE_MODCTL_OPERATION (1 << 0)

	/**
	* tc3589x_reg_read() - read a single TC3589x register
	* @tc3589x: Device to read from
	* @reg: Register to read
	*/
	int tc3589x_reg_read(struct tc3589x *tc3589x, u8 reg)
	{
	int ret;

	ret = i2c_smbus_read_byte_data(tc3589x->i2c, reg);
	if (ret < 0)
	dev_err(tc3589x->dev, "failed to read reg %#x: %d\n",
	reg, ret);

	return ret;
	}
	EXPORT_SYMBOL_GPL(tc3589x_reg_read);

	/**
	* tc3589x_reg_read() - write a single TC3589x register
	* @tc3589x: Device to write to
	* @reg: Register to read
	* @data: Value to write
	*/
	int tc3589x_reg_write(struct tc3589x *tc3589x, u8 reg, u8 data)
	{
	int ret;

	ret = i2c_smbus_write_byte_data(tc3589x->i2c, reg, data);
	if (ret < 0)
	dev_err(tc3589x->dev, "failed to write reg %#x: %d\n",
	reg, ret);

	return ret;
	}
	EXPORT_SYMBOL_GPL(tc3589x_reg_write);

	/**
	* tc3589x_block_read() - read multiple TC3589x registers
	* @tc3589x: Device to read from
	* @reg: First register
	* @length: Number of registers
	* @values: Buffer to write to
	*/
	int tc3589x_block_read(struct tc3589x tc3589x, u8 reg, u8 length, u8 values)
	{
	int ret;

	ret = i2c_smbus_read_i2c_block_data(tc3589x->i2c, reg, length, values);
	if (ret < 0)
	dev_err(tc3589x->dev, "failed to read regs %#x: %d\n",
	reg, ret);

	return ret;
	}
	EXPORT_SYMBOL_GPL(tc3589x_block_read);

	/**
	* tc3589x_block_write() - write multiple TC3589x registers
	* @tc3589x: Device to write to
	* @reg: First register
	* @length: Number of registers
	* @values: Values to write
	*/
	int tc3589x_block_write(struct tc3589x *tc3589x, u8 reg, u8 length,
	const u8 *values)
	{
	int ret;

	ret = i2c_smbus_write_i2c_block_data(tc3589x->i2c, reg, length,
	values);
	if (ret < 0)
	dev_err(tc3589x->dev, "failed to write regs %#x: %d\n",
	reg, ret);

	return ret;
	}
	EXPORT_SYMBOL_GPL(tc3589x_block_write);

	/**
	* tc3589x_set_bits() - set the value of a bitfield in a TC3589x register
	* @tc3589x: Device to write to
	* @reg: Register to write
	* @mask: Mask of bits to set
	* @values: Value to set
	*/
	int tc3589x_set_bits(struct tc3589x *tc3589x, u8 reg, u8 mask, u8 val)
	{
	int ret;

	mutex_lock(&tc3589x->lock);

	ret = tc3589x_reg_read(tc3589x, reg);
	if (ret < 0)
	goto out;

	ret &= ~mask;
	ret \|= val;

	ret = tc3589x_reg_write(tc3589x, reg, ret);

	out:
	mutex_unlock(&tc3589x->lock);
	return ret;
	}
	EXPORT_SYMBOL_GPL(tc3589x_set_bits);

	static struct resource gpio_resources[] = {
	{
	.start = TC3589x_INT_GPIIRQ,
	.end = TC3589x_INT_GPIIRQ,
	.flags = IORESOURCE_IRQ,
	},
	};

	static struct resource keypad_resources[] = {
	{
	.start = TC3589x_INT_KBDIRQ,
	.end = TC3589x_INT_KBDIRQ,
	.flags = IORESOURCE_IRQ,
	},
	};

	static struct mfd_cell tc3589x_dev_gpio[] = {
	{
	.name = "tc3589x-gpio",
	.num_resources = ARRAY_SIZE(gpio_resources),
	.resources = &gpio_resources[0],
	.of_compatible = "tc3589x-gpio",
	},
	};

	static struct mfd_cell tc3589x_dev_keypad[] = {
	{
	.name = "tc3589x-keypad",
	.num_resources = ARRAY_SIZE(keypad_resources),
	.resources = &keypad_resources[0],
	.of_compatible = "tc3589x-keypad",
	},
	};

	static irqreturn_t tc3589x_irq(int irq, void *data)
	{
	struct tc3589x *tc3589x = data;
	int status;

	again:
	status = tc3589x_reg_read(tc3589x, TC3589x_IRQST);
	if (status < 0)
	return IRQ_NONE;

	while (status) {
	int bit = __ffs(status);
	int virq = irq_create_mapping(tc3589x->domain, bit);

	handle_nested_irq(virq);
	status &= ~(1 << bit);
	}

	/*
	* A dummy read or write (to any register) appears to be necessary to
	* have the last interrupt clear (for example, GPIO IC write) take
	* effect. In such a case, recheck for any interrupt which is still
	* pending.
	*/
	status = tc3589x_reg_read(tc3589x, TC3589x_IRQST);
	if (status)
	goto again;

	return IRQ_HANDLED;
	}

	static int tc3589x_irq_map(struct irq_domain *d, unsigned int virq,
	irq_hw_number_t hwirq)
	{
	struct tc3589x *tc3589x = d->host_data;

	irq_set_chip_data(virq, tc3589x);
	irq_set_chip_and_handler(virq, &dummy_irq_chip,
	handle_edge_irq);
	irq_set_nested_thread(virq, 1);
	#ifdef CONFIG_ARM
	set_irq_flags(virq, IRQF_VALID);
	#else
	irq_set_noprobe(virq);
	#endif

	return 0;
	}

	static void tc3589x_irq_unmap(struct irq_domain *d, unsigned int virq)
	{
	#ifdef CONFIG_ARM
	set_irq_flags(virq, 0);
	#endif
	irq_set_chip_and_handler(virq, NULL, NULL);
	irq_set_chip_data(virq, NULL);
	}

	static struct irq_domain_ops tc3589x_irq_ops = {
	.map = tc3589x_irq_map,
	.unmap = tc3589x_irq_unmap,
	.xlate = irq_domain_xlate_twocell,
	};

	static int tc3589x_irq_init(struct tc3589x tc3589x, struct device_node np)
	{
	int base = tc3589x->irq_base;

	tc3589x->domain = irq_domain_add_simple(
	np, TC3589x_NR_INTERNAL_IRQS, base,
	&tc3589x_irq_ops, tc3589x);

	if (!tc3589x->domain) {
	dev_err(tc3589x->dev, "Failed to create irqdomain\n");
	return -ENOSYS;
	}

	return 0;
	}

	static int tc3589x_chip_init(struct tc3589x *tc3589x)
	{
	int manf, ver, ret;

	manf = tc3589x_reg_read(tc3589x, TC3589x_MANFCODE);
	if (manf < 0)
	return manf;

	ver = tc3589x_reg_read(tc3589x, TC3589x_VERSION);
	if (ver < 0)
	return ver;

	if (manf != TC3589x_MANFCODE_MAGIC) {
	dev_err(tc3589x->dev, "unknown manufacturer: %#x\n", manf);
	return -EINVAL;
	}

	dev_info(tc3589x->dev, "manufacturer: %#x, version: %#x\n", manf, ver);

	/*
	* Put everything except the IRQ module into reset;
	* also spare the GPIO module for any pin initialization
	* done during pre-kernel boot
	*/
	ret = tc3589x_reg_write(tc3589x, TC3589x_RSTCTRL,
	TC3589x_RSTCTRL_TIMRST
	\| TC3589x_RSTCTRL_ROTRST
	\| TC3589x_RSTCTRL_KBDRST);
	if (ret < 0)
	return ret;

	/* Clear the reset interrupt. */
	return tc3589x_reg_write(tc3589x, TC3589x_RSTINTCLR, 0x1);
	}

	static int tc3589x_device_init(struct tc3589x *tc3589x)
	{
	int ret = 0;
	unsigned int blocks = tc3589x->pdata->block;

	if (blocks & TC3589x_BLOCK_GPIO) {
	ret = mfd_add_devices(tc3589x->dev, -1, tc3589x_dev_gpio,
	ARRAY_SIZE(tc3589x_dev_gpio), NULL,
	tc3589x->irq_base, tc3589x->domain);
	if (ret) {
	dev_err(tc3589x->dev, "failed to add gpio child\n");
	return ret;
	}
	dev_info(tc3589x->dev, "added gpio block\n");
	}

	if (blocks & TC3589x_BLOCK_KEYPAD) {
	ret = mfd_add_devices(tc3589x->dev, -1, tc3589x_dev_keypad,
	ARRAY_SIZE(tc3589x_dev_keypad), NULL,
	tc3589x->irq_base, tc3589x->domain);
	if (ret) {
	dev_err(tc3589x->dev, "failed to keypad child\n");
	return ret;
	}
	dev_info(tc3589x->dev, "added keypad block\n");
	}

	return ret;
	}

	static int tc3589x_of_probe(struct device_node *np,
	struct tc3589x_platform_data *pdata)
	{
	struct device_node *child;

	for_each_child_of_node(np, child) {
	if (!strcmp(child->name, "tc3589x_gpio")) {
	pdata->block \|= TC3589x_BLOCK_GPIO;
	}
	if (!strcmp(child->name, "tc3589x_keypad")) {
	pdata->block \|= TC3589x_BLOCK_KEYPAD;
	}
	}

	return 0;
	}

	static int tc3589x_probe(struct i2c_client *i2c,
	const struct i2c_device_id *id)
	{
	struct tc3589x_platform_data *pdata = dev_get_platdata(&i2c->dev);
	struct device_node *np = i2c->dev.of_node;
	struct tc3589x *tc3589x;
	int ret;

	if (!pdata) {
	if (np) {
	pdata = devm_kzalloc(&i2c->dev, sizeof(*pdata), GFP_KERNEL);
	if (!pdata)
	return -ENOMEM;

	ret = tc3589x_of_probe(np, pdata);
	if (ret)
	return ret;
	}
	else {
	dev_err(&i2c->dev, "No platform data or DT found\n");
	return -EINVAL;
	}
	}

	if (!i2c_check_functionality(i2c->adapter, I2C_FUNC_SMBUS_BYTE_DATA
	\| I2C_FUNC_SMBUS_I2C_BLOCK))
	return -EIO;

	tc3589x = devm_kzalloc(&i2c->dev, sizeof(struct tc3589x),
	GFP_KERNEL);
	if (!tc3589x)
	return -ENOMEM;

	mutex_init(&tc3589x->lock);

	tc3589x->dev = &i2c->dev;
	tc3589x->i2c = i2c;
	tc3589x->pdata = pdata;
	tc3589x->irq_base = pdata->irq_base;

	switch (id->driver_data) {
	case TC3589X_TC35893:
	case TC3589X_TC35895:
	case TC3589X_TC35896:
	tc3589x->num_gpio = 20;
	break;
	case TC3589X_TC35890:
	case TC3589X_TC35892:
	case TC3589X_TC35894:
	case TC3589X_UNKNOWN:
	default:
	tc3589x->num_gpio = 24;
	break;
	}

	i2c_set_clientdata(i2c, tc3589x);

	ret = tc3589x_chip_init(tc3589x);
	if (ret)
	return ret;

	ret = tc3589x_irq_init(tc3589x, np);
	if (ret)
	return ret;

	ret = request_threaded_irq(tc3589x->i2c->irq, NULL, tc3589x_irq,
	IRQF_TRIGGER_FALLING \| IRQF_ONESHOT,
	"tc3589x", tc3589x);
	if (ret) {
	dev_err(tc3589x->dev, "failed to request IRQ: %d\n", ret);
	return ret;
	}

	ret = tc3589x_device_init(tc3589x);
	if (ret) {
	dev_err(tc3589x->dev, "failed to add child devices\n");
	return ret;
	}

	return 0;
	}

	static int tc3589x_remove(struct i2c_client *client)
	{
	struct tc3589x *tc3589x = i2c_get_clientdata(client);

	mfd_remove_devices(tc3589x->dev);

	return 0;
	}

	#ifdef CONFIG_PM_SLEEP
	static int tc3589x_suspend(struct device *dev)
	{
	struct tc3589x *tc3589x = dev_get_drvdata(dev);
	struct i2c_client *client = tc3589x->i2c;
	int ret = 0;

	/* put the system to sleep mode */
	if (!device_may_wakeup(&client->dev))
	ret = tc3589x_reg_write(tc3589x, TC3589x_CLKMODE,
	TC3589x_CLKMODE_MODCTL_SLEEP);

	return ret;
	}

	static int tc3589x_resume(struct device *dev)
	{
	struct tc3589x *tc3589x = dev_get_drvdata(dev);
	struct i2c_client *client = tc3589x->i2c;
	int ret = 0;

	/* enable the system into operation */
	if (!device_may_wakeup(&client->dev))
	ret = tc3589x_reg_write(tc3589x, TC3589x_CLKMODE,
	TC3589x_CLKMODE_MODCTL_OPERATION);

	return ret;
	}
	#endif

	static SIMPLE_DEV_PM_OPS(tc3589x_dev_pm_ops, tc3589x_suspend, tc3589x_resume);

	static const struct i2c_device_id tc3589x_id[] = {
	{ "tc35890", TC3589X_TC35890 },
	{ "tc35892", TC3589X_TC35892 },
	{ "tc35893", TC3589X_TC35893 },
	{ "tc35894", TC3589X_TC35894 },
	{ "tc35895", TC3589X_TC35895 },
	{ "tc35896", TC3589X_TC35896 },
	{ "tc3589x", TC3589X_UNKNOWN },
	{ }
	};
	MODULE_DEVICE_TABLE(i2c, tc3589x_id);

	static struct i2c_driver tc3589x_driver = {
	.driver.name = "tc3589x",
	.driver.owner = THIS_MODULE,
	.driver.pm = &tc3589x_dev_pm_ops,
	.probe = tc3589x_probe,
	.remove = tc3589x_remove,
	.id_table = tc3589x_id,
	};

	static int __init tc3589x_init(void)
	{
	return i2c_add_driver(&tc3589x_driver);
	}
	subsys_initcall(tc3589x_init);

	static void __exit tc3589x_exit(void)
	{
	i2c_del_driver(&tc3589x_driver);
	}
	module_exit(tc3589x_exit);

	MODULE_LICENSE("GPL v2");
	MODULE_DESCRIPTION("TC3589x MFD core driver");
	MODULE_AUTHOR("Hanumath Prasad, Rabin Vincent");