drivers/input/rmi4/rmi_i2c.c - linux/kernel/git/davem/net - Git at Google

 /*
  * Copyright (c) 2011-2016 Synaptics Incorporated
  * Copyright (c) 2011 Unixphere
  *
  * This program is free software; you can redistribute it and/or modify it
  * under the terms of the GNU General Public License version 2 as published by
  * the Free Software Foundation.
  */

 #include <linux/i2c.h>
 #include <linux/rmi.h>
 #include <linux/irq.h>
 #include <linux/of.h>
 #include "rmi_driver.h"

 #define BUFFER_SIZE_INCREMENT 32

 /**
  * struct rmi_i2c_xport - stores information for i2c communication
  *
  * @xport: The transport interface structure
  *
  * @page_mutex: Locks current page to avoid changing pages in unexpected ways.
  * @page: Keeps track of the current virtual page
  *
  * @tx_buf: Buffer used for transmitting data to the sensor over i2c.
  * @tx_buf_size: Size of the buffer
  */
 struct rmi_i2c_xport {
 	struct rmi_transport_dev xport;
 	struct i2c_client *client;

 	struct mutex page_mutex;
 	int page;

 	int irq;

 	u8 *tx_buf;
 	size_t tx_buf_size;
 };

 #define RMI_PAGE_SELECT_REGISTER 0xff
 #define RMI_I2C_PAGE(addr) (((addr) >> 8) & 0xff)

 /*
  * rmi_set_page - Set RMI page
  * @xport: The pointer to the rmi_transport_dev struct
  * @page: The new page address.
  *
  * RMI devices have 16-bit addressing, but some of the transport
  * implementations (like SMBus) only have 8-bit addressing. So RMI implements
  * a page address at 0xff of every page so we can reliable page addresses
  * every 256 registers.
  *
  * The page_mutex lock must be held when this function is entered.
  *
  * Returns zero on success, non-zero on failure.
  */
 static int rmi_set_page(struct rmi_i2c_xport *rmi_i2c, u8 page)
 {
 	struct i2c_client *client = rmi_i2c->client;
 	u8 txbuf[2] = {RMI_PAGE_SELECT_REGISTER, page};
 	int retval;

 	retval = i2c_master_send(client, txbuf, sizeof(txbuf));
 	if (retval != sizeof(txbuf)) {
 		dev_err(&client->dev,
 			"%s: set page failed: %d.", __func__, retval);
 		return (retval < 0) ? retval : -EIO;
 	}

 	rmi_i2c->page = page;
 	return 0;
 }

 static int rmi_i2c_write_block(struct rmi_transport_dev *xport, u16 addr,
 			       const void *buf, size_t len)
 {
 	struct rmi_i2c_xport *rmi_i2c =
 		container_of(xport, struct rmi_i2c_xport, xport);
 	struct i2c_client *client = rmi_i2c->client;
 	size_t tx_size = len + 1;
 	int retval;

 	mutex_lock(&rmi_i2c->page_mutex);

 	if (!rmi_i2c->tx_buf || rmi_i2c->tx_buf_size < tx_size) {
 		if (rmi_i2c->tx_buf)
 			devm_kfree(&client->dev, rmi_i2c->tx_buf);
 		rmi_i2c->tx_buf_size = tx_size + BUFFER_SIZE_INCREMENT;
 		rmi_i2c->tx_buf = devm_kzalloc(&client->dev,
 					       rmi_i2c->tx_buf_size,
 					       GFP_KERNEL);
 		if (!rmi_i2c->tx_buf) {
 			rmi_i2c->tx_buf_size = 0;
 			retval = -ENOMEM;
 			goto exit;
 		}
 	}

 	rmi_i2c->tx_buf[0] = addr & 0xff;
 	memcpy(rmi_i2c->tx_buf + 1, buf, len);

 	if (RMI_I2C_PAGE(addr) != rmi_i2c->page) {
 		retval = rmi_set_page(rmi_i2c, RMI_I2C_PAGE(addr));
 		if (retval)
 			goto exit;
 	}

 	retval = i2c_master_send(client, rmi_i2c->tx_buf, tx_size);
 	if (retval == tx_size)
 		retval = 0;
 	else if (retval >= 0)
 		retval = -EIO;

 exit:
 	rmi_dbg(RMI_DEBUG_XPORT, &client->dev,
 		"write %zd bytes at %#06x: %d (%*ph)\n",
 		len, addr, retval, (int)len, buf);

 	mutex_unlock(&rmi_i2c->page_mutex);
 	return retval;
 }

 static int rmi_i2c_read_block(struct rmi_transport_dev *xport, u16 addr,
 			      void *buf, size_t len)
 {
 	struct rmi_i2c_xport *rmi_i2c =
 		container_of(xport, struct rmi_i2c_xport, xport);
 	struct i2c_client *client = rmi_i2c->client;
 	u8 addr_offset = addr & 0xff;
 	int retval;
 	struct i2c_msg msgs[] = {
 		{
 			.addr	= client->addr,
 			.len	= sizeof(addr_offset),
 			.buf	= &addr_offset,
 		},
 		{
 			.addr	= client->addr,
 			.flags	= I2C_M_RD,
 			.len	= len,
 			.buf	= buf,
 		},
 	};

 	mutex_lock(&rmi_i2c->page_mutex);

 	if (RMI_I2C_PAGE(addr) != rmi_i2c->page) {
 		retval = rmi_set_page(rmi_i2c, RMI_I2C_PAGE(addr));
 		if (retval)
 			goto exit;
 	}

 	retval = i2c_transfer(client->adapter, msgs, ARRAY_SIZE(msgs));
 	if (retval == ARRAY_SIZE(msgs))
 		retval = 0; /* success */
 	else if (retval >= 0)
 		retval = -EIO;

 exit:
 	rmi_dbg(RMI_DEBUG_XPORT, &client->dev,
 		"read %zd bytes at %#06x: %d (%*ph)\n",
 		len, addr, retval, (int)len, buf);

 	mutex_unlock(&rmi_i2c->page_mutex);
 	return retval;
 }

 static const struct rmi_transport_ops rmi_i2c_ops = {
 	.write_block	= rmi_i2c_write_block,
 	.read_block	= rmi_i2c_read_block,
 };

 static irqreturn_t rmi_i2c_irq(int irq, void *dev_id)
 {
 	struct rmi_i2c_xport *rmi_i2c = dev_id;
 	struct rmi_device *rmi_dev = rmi_i2c->xport.rmi_dev;
 	int ret;

 	ret = rmi_process_interrupt_requests(rmi_dev);
 	if (ret)
 		rmi_dbg(RMI_DEBUG_XPORT, &rmi_dev->dev,
 			"Failed to process interrupt request: %d\n", ret);

 	return IRQ_HANDLED;
 }

 static int rmi_i2c_init_irq(struct i2c_client *client)
 {
 	struct rmi_i2c_xport *rmi_i2c = i2c_get_clientdata(client);
 	int irq_flags = irqd_get_trigger_type(irq_get_irq_data(rmi_i2c->irq));
 	int ret;

 	if (!irq_flags)
 		irq_flags = IRQF_TRIGGER_LOW;

 	ret = devm_request_threaded_irq(&client->dev, rmi_i2c->irq, NULL,
 			rmi_i2c_irq, irq_flags | IRQF_ONESHOT, client->name,
 			rmi_i2c);
 	if (ret < 0) {
 		dev_warn(&client->dev, "Failed to register interrupt %d\n",
 			rmi_i2c->irq);

 		return ret;
 	}

 	return 0;
 }

 #ifdef CONFIG_OF
 static const struct of_device_id rmi_i2c_of_match[] = {
 	{ .compatible = "syna,rmi4-i2c" },
 	{},
 };
 MODULE_DEVICE_TABLE(of, rmi_i2c_of_match);
 #endif

 static int rmi_i2c_probe(struct i2c_client *client,
 			 const struct i2c_device_id *id)
 {
 	struct rmi_device_platform_data *pdata;
 	struct rmi_device_platform_data *client_pdata =
 					dev_get_platdata(&client->dev);
 	struct rmi_i2c_xport *rmi_i2c;
 	int retval;

 	rmi_i2c = devm_kzalloc(&client->dev, sizeof(struct rmi_i2c_xport),
 				GFP_KERNEL);
 	if (!rmi_i2c)
 		return -ENOMEM;

 	pdata = &rmi_i2c->xport.pdata;

 	if (!client->dev.of_node && client_pdata)
 		*pdata = *client_pdata;

 	if (client->irq > 0)
 		rmi_i2c->irq = client->irq;

 	rmi_dbg(RMI_DEBUG_XPORT, &client->dev, "Probing %s.\n",
 			dev_name(&client->dev));
 	if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C)) {
 		dev_err(&client->dev,
 			"adapter does not support required functionality.\n");
 		return -ENODEV;
 	}

 	rmi_i2c->client = client;
 	mutex_init(&rmi_i2c->page_mutex);

 	rmi_i2c->xport.dev = &client->dev;
 	rmi_i2c->xport.proto_name = "i2c";
 	rmi_i2c->xport.ops = &rmi_i2c_ops;

 	i2c_set_clientdata(client, rmi_i2c);

 	/*
 	 * Setting the page to zero will (a) make sure the PSR is in a
 	 * known state, and (b) make sure we can talk to the device.
 	 */
 	retval = rmi_set_page(rmi_i2c, 0);
 	if (retval) {
 		dev_err(&client->dev, "Failed to set page select to 0.\n");
 		return retval;
 	}

 	retval = rmi_register_transport_device(&rmi_i2c->xport);
 	if (retval) {
 		dev_err(&client->dev, "Failed to register transport driver at 0x%.2X.\n",
 			client->addr);
 		return retval;
 	}

 	retval = rmi_i2c_init_irq(client);
 	if (retval < 0)
 		return retval;

 	dev_info(&client->dev, "registered rmi i2c driver at %#04x.\n",
 			client->addr);
 	return 0;
 }

 static int rmi_i2c_remove(struct i2c_client *client)
 {
 	struct rmi_i2c_xport *rmi_i2c = i2c_get_clientdata(client);

 	rmi_unregister_transport_device(&rmi_i2c->xport);

 	return 0;
 }

 #ifdef CONFIG_PM_SLEEP
 static int rmi_i2c_suspend(struct device *dev)
 {
 	struct i2c_client *client = to_i2c_client(dev);
 	struct rmi_i2c_xport *rmi_i2c = i2c_get_clientdata(client);
 	int ret;

 	ret = rmi_driver_suspend(rmi_i2c->xport.rmi_dev);
 	if (ret)
 		dev_warn(dev, "Failed to resume device: %d\n", ret);

 	disable_irq(rmi_i2c->irq);
 	if (device_may_wakeup(&client->dev)) {
 		ret = enable_irq_wake(rmi_i2c->irq);
 		if (!ret)
 			dev_warn(dev, "Failed to enable irq for wake: %d\n",
 				ret);
 	}
 	return ret;
 }

 static int rmi_i2c_resume(struct device *dev)
 {
 	struct i2c_client *client = to_i2c_client(dev);
 	struct rmi_i2c_xport *rmi_i2c = i2c_get_clientdata(client);
 	int ret;

 	enable_irq(rmi_i2c->irq);
 	if (device_may_wakeup(&client->dev)) {
 		ret = disable_irq_wake(rmi_i2c->irq);
 		if (!ret)
 			dev_warn(dev, "Failed to disable irq for wake: %d\n",
 				ret);
 	}

 	ret = rmi_driver_resume(rmi_i2c->xport.rmi_dev);
 	if (ret)
 		dev_warn(dev, "Failed to resume device: %d\n", ret);

 	return ret;
 }
 #endif

 #ifdef CONFIG_PM
 static int rmi_i2c_runtime_suspend(struct device *dev)
 {
 	struct i2c_client *client = to_i2c_client(dev);
 	struct rmi_i2c_xport *rmi_i2c = i2c_get_clientdata(client);
 	int ret;

 	ret = rmi_driver_suspend(rmi_i2c->xport.rmi_dev);
 	if (ret)
 		dev_warn(dev, "Failed to resume device: %d\n", ret);

 	disable_irq(rmi_i2c->irq);

 	return 0;
 }

 static int rmi_i2c_runtime_resume(struct device *dev)
 {
 	struct i2c_client *client = to_i2c_client(dev);
 	struct rmi_i2c_xport *rmi_i2c = i2c_get_clientdata(client);
 	int ret;

 	enable_irq(rmi_i2c->irq);

 	ret = rmi_driver_resume(rmi_i2c->xport.rmi_dev);
 	if (ret)
 		dev_warn(dev, "Failed to resume device: %d\n", ret);

 	return 0;
 }
 #endif

 static const struct dev_pm_ops rmi_i2c_pm = {
 	SET_SYSTEM_SLEEP_PM_OPS(rmi_i2c_suspend, rmi_i2c_resume)
 	SET_RUNTIME_PM_OPS(rmi_i2c_runtime_suspend, rmi_i2c_runtime_resume,
 			   NULL)
 };

 static const struct i2c_device_id rmi_id[] = {
 	{ "rmi4_i2c", 0 },
 	{ }
 };
 MODULE_DEVICE_TABLE(i2c, rmi_id);

 static struct i2c_driver rmi_i2c_driver = {
 	.driver = {
 		.name	= "rmi4_i2c",
 		.pm	= &rmi_i2c_pm,
 		.of_match_table = of_match_ptr(rmi_i2c_of_match),
 	},
 	.id_table	= rmi_id,
 	.probe		= rmi_i2c_probe,
 	.remove		= rmi_i2c_remove,
 };

 module_i2c_driver(rmi_i2c_driver);

 MODULE_AUTHOR("Christopher Heiny <cheiny@synaptics.com>");
 MODULE_AUTHOR("Andrew Duggan <aduggan@synaptics.com>");
 MODULE_DESCRIPTION("RMI I2C driver");
 MODULE_LICENSE("GPL");
 MODULE_VERSION(RMI_DRIVER_VERSION);
	/*
	* Copyright (c) 2011-2016 Synaptics Incorporated
	* Copyright (c) 2011 Unixphere
	*
	* This program is free software; you can redistribute it and/or modify it
	* under the terms of the GNU General Public License version 2 as published by
	* the Free Software Foundation.
	*/

	#include <linux/i2c.h>
	#include <linux/rmi.h>
	#include <linux/irq.h>
	#include <linux/of.h>
	#include "rmi_driver.h"

	#define BUFFER_SIZE_INCREMENT 32

	/**
	* struct rmi_i2c_xport - stores information for i2c communication
	*
	* @xport: The transport interface structure
	*
	* @page_mutex: Locks current page to avoid changing pages in unexpected ways.
	* @page: Keeps track of the current virtual page
	*
	* @tx_buf: Buffer used for transmitting data to the sensor over i2c.
	* @tx_buf_size: Size of the buffer
	*/
	struct rmi_i2c_xport {
	struct rmi_transport_dev xport;
	struct i2c_client *client;

	struct mutex page_mutex;
	int page;

	int irq;

	u8 *tx_buf;
	size_t tx_buf_size;
	};

	#define RMI_PAGE_SELECT_REGISTER 0xff
	#define RMI_I2C_PAGE(addr) (((addr) >> 8) & 0xff)

	/*
	* rmi_set_page - Set RMI page
	* @xport: The pointer to the rmi_transport_dev struct
	* @page: The new page address.
	*
	* RMI devices have 16-bit addressing, but some of the transport
	* implementations (like SMBus) only have 8-bit addressing. So RMI implements
	* a page address at 0xff of every page so we can reliable page addresses
	* every 256 registers.
	*
	* The page_mutex lock must be held when this function is entered.
	*
	* Returns zero on success, non-zero on failure.
	*/
	static int rmi_set_page(struct rmi_i2c_xport *rmi_i2c, u8 page)
	{
	struct i2c_client *client = rmi_i2c->client;
	u8 txbuf[2] = {RMI_PAGE_SELECT_REGISTER, page};
	int retval;

	retval = i2c_master_send(client, txbuf, sizeof(txbuf));
	if (retval != sizeof(txbuf)) {
	dev_err(&client->dev,
	"%s: set page failed: %d.", __func__, retval);
	return (retval < 0) ? retval : -EIO;
	}

	rmi_i2c->page = page;
	return 0;
	}

	static int rmi_i2c_write_block(struct rmi_transport_dev *xport, u16 addr,
	const void *buf, size_t len)
	{
	struct rmi_i2c_xport *rmi_i2c =
	container_of(xport, struct rmi_i2c_xport, xport);
	struct i2c_client *client = rmi_i2c->client;
	size_t tx_size = len + 1;
	int retval;

	mutex_lock(&rmi_i2c->page_mutex);

	if (!rmi_i2c->tx_buf \|\| rmi_i2c->tx_buf_size < tx_size) {
	if (rmi_i2c->tx_buf)
	devm_kfree(&client->dev, rmi_i2c->tx_buf);
	rmi_i2c->tx_buf_size = tx_size + BUFFER_SIZE_INCREMENT;
	rmi_i2c->tx_buf = devm_kzalloc(&client->dev,
	rmi_i2c->tx_buf_size,
	GFP_KERNEL);
	if (!rmi_i2c->tx_buf) {
	rmi_i2c->tx_buf_size = 0;
	retval = -ENOMEM;
	goto exit;
	}
	}

	rmi_i2c->tx_buf[0] = addr & 0xff;
	memcpy(rmi_i2c->tx_buf + 1, buf, len);

	if (RMI_I2C_PAGE(addr) != rmi_i2c->page) {
	retval = rmi_set_page(rmi_i2c, RMI_I2C_PAGE(addr));
	if (retval)
	goto exit;
	}

	retval = i2c_master_send(client, rmi_i2c->tx_buf, tx_size);
	if (retval == tx_size)
	retval = 0;
	else if (retval >= 0)
	retval = -EIO;

	exit:
	rmi_dbg(RMI_DEBUG_XPORT, &client->dev,
	"write %zd bytes at %#06x: %d (%*ph)\n",
	len, addr, retval, (int)len, buf);

	mutex_unlock(&rmi_i2c->page_mutex);
	return retval;
	}

	static int rmi_i2c_read_block(struct rmi_transport_dev *xport, u16 addr,
	void *buf, size_t len)
	{
	struct rmi_i2c_xport *rmi_i2c =
	container_of(xport, struct rmi_i2c_xport, xport);
	struct i2c_client *client = rmi_i2c->client;
	u8 addr_offset = addr & 0xff;
	int retval;
	struct i2c_msg msgs[] = {
	{
	.addr = client->addr,
	.len = sizeof(addr_offset),
	.buf = &addr_offset,
	},
	{
	.addr = client->addr,
	.flags = I2C_M_RD,
	.len = len,
	.buf = buf,
	},
	};

	mutex_lock(&rmi_i2c->page_mutex);

	if (RMI_I2C_PAGE(addr) != rmi_i2c->page) {
	retval = rmi_set_page(rmi_i2c, RMI_I2C_PAGE(addr));
	if (retval)
	goto exit;
	}

	retval = i2c_transfer(client->adapter, msgs, ARRAY_SIZE(msgs));
	if (retval == ARRAY_SIZE(msgs))
	retval = 0; /* success */
	else if (retval >= 0)
	retval = -EIO;

	exit:
	rmi_dbg(RMI_DEBUG_XPORT, &client->dev,
	"read %zd bytes at %#06x: %d (%*ph)\n",
	len, addr, retval, (int)len, buf);

	mutex_unlock(&rmi_i2c->page_mutex);
	return retval;
	}

	static const struct rmi_transport_ops rmi_i2c_ops = {
	.write_block = rmi_i2c_write_block,
	.read_block = rmi_i2c_read_block,
	};

	static irqreturn_t rmi_i2c_irq(int irq, void *dev_id)
	{
	struct rmi_i2c_xport *rmi_i2c = dev_id;
	struct rmi_device *rmi_dev = rmi_i2c->xport.rmi_dev;
	int ret;

	ret = rmi_process_interrupt_requests(rmi_dev);
	if (ret)
	rmi_dbg(RMI_DEBUG_XPORT, &rmi_dev->dev,
	"Failed to process interrupt request: %d\n", ret);

	return IRQ_HANDLED;
	}

	static int rmi_i2c_init_irq(struct i2c_client *client)
	{
	struct rmi_i2c_xport *rmi_i2c = i2c_get_clientdata(client);
	int irq_flags = irqd_get_trigger_type(irq_get_irq_data(rmi_i2c->irq));
	int ret;

	if (!irq_flags)
	irq_flags = IRQF_TRIGGER_LOW;

	ret = devm_request_threaded_irq(&client->dev, rmi_i2c->irq, NULL,
	rmi_i2c_irq, irq_flags \| IRQF_ONESHOT, client->name,
	rmi_i2c);
	if (ret < 0) {
	dev_warn(&client->dev, "Failed to register interrupt %d\n",
	rmi_i2c->irq);

	return ret;
	}

	return 0;
	}

	#ifdef CONFIG_OF
	static const struct of_device_id rmi_i2c_of_match[] = {
	{ .compatible = "syna,rmi4-i2c" },
	{},
	};
	MODULE_DEVICE_TABLE(of, rmi_i2c_of_match);
	#endif

	static int rmi_i2c_probe(struct i2c_client *client,
	const struct i2c_device_id *id)
	{
	struct rmi_device_platform_data *pdata;
	struct rmi_device_platform_data *client_pdata =
	dev_get_platdata(&client->dev);
	struct rmi_i2c_xport *rmi_i2c;
	int retval;

	rmi_i2c = devm_kzalloc(&client->dev, sizeof(struct rmi_i2c_xport),
	GFP_KERNEL);
	if (!rmi_i2c)
	return -ENOMEM;

	pdata = &rmi_i2c->xport.pdata;

	if (!client->dev.of_node && client_pdata)
	pdata = client_pdata;

	if (client->irq > 0)
	rmi_i2c->irq = client->irq;

	rmi_dbg(RMI_DEBUG_XPORT, &client->dev, "Probing %s.\n",
	dev_name(&client->dev));
	if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C)) {
	dev_err(&client->dev,
	"adapter does not support required functionality.\n");
	return -ENODEV;
	}

	rmi_i2c->client = client;
	mutex_init(&rmi_i2c->page_mutex);

	rmi_i2c->xport.dev = &client->dev;
	rmi_i2c->xport.proto_name = "i2c";
	rmi_i2c->xport.ops = &rmi_i2c_ops;

	i2c_set_clientdata(client, rmi_i2c);

	/*
	* Setting the page to zero will (a) make sure the PSR is in a
	* known state, and (b) make sure we can talk to the device.
	*/
	retval = rmi_set_page(rmi_i2c, 0);
	if (retval) {
	dev_err(&client->dev, "Failed to set page select to 0.\n");
	return retval;
	}

	retval = rmi_register_transport_device(&rmi_i2c->xport);
	if (retval) {
	dev_err(&client->dev, "Failed to register transport driver at 0x%.2X.\n",
	client->addr);
	return retval;
	}

	retval = rmi_i2c_init_irq(client);
	if (retval < 0)
	return retval;

	dev_info(&client->dev, "registered rmi i2c driver at %#04x.\n",
	client->addr);
	return 0;
	}

	static int rmi_i2c_remove(struct i2c_client *client)
	{
	struct rmi_i2c_xport *rmi_i2c = i2c_get_clientdata(client);

	rmi_unregister_transport_device(&rmi_i2c->xport);

	return 0;
	}

	#ifdef CONFIG_PM_SLEEP
	static int rmi_i2c_suspend(struct device *dev)
	{
	struct i2c_client *client = to_i2c_client(dev);
	struct rmi_i2c_xport *rmi_i2c = i2c_get_clientdata(client);
	int ret;

	ret = rmi_driver_suspend(rmi_i2c->xport.rmi_dev);
	if (ret)
	dev_warn(dev, "Failed to resume device: %d\n", ret);

	disable_irq(rmi_i2c->irq);
	if (device_may_wakeup(&client->dev)) {
	ret = enable_irq_wake(rmi_i2c->irq);
	if (!ret)
	dev_warn(dev, "Failed to enable irq for wake: %d\n",
	ret);
	}
	return ret;
	}

	static int rmi_i2c_resume(struct device *dev)
	{
	struct i2c_client *client = to_i2c_client(dev);
	struct rmi_i2c_xport *rmi_i2c = i2c_get_clientdata(client);
	int ret;

	enable_irq(rmi_i2c->irq);
	if (device_may_wakeup(&client->dev)) {
	ret = disable_irq_wake(rmi_i2c->irq);
	if (!ret)
	dev_warn(dev, "Failed to disable irq for wake: %d\n",
	ret);
	}

	ret = rmi_driver_resume(rmi_i2c->xport.rmi_dev);
	if (ret)
	dev_warn(dev, "Failed to resume device: %d\n", ret);

	return ret;
	}
	#endif

	#ifdef CONFIG_PM
	static int rmi_i2c_runtime_suspend(struct device *dev)
	{
	struct i2c_client *client = to_i2c_client(dev);
	struct rmi_i2c_xport *rmi_i2c = i2c_get_clientdata(client);
	int ret;

	ret = rmi_driver_suspend(rmi_i2c->xport.rmi_dev);
	if (ret)
	dev_warn(dev, "Failed to resume device: %d\n", ret);

	disable_irq(rmi_i2c->irq);

	return 0;
	}

	static int rmi_i2c_runtime_resume(struct device *dev)
	{
	struct i2c_client *client = to_i2c_client(dev);
	struct rmi_i2c_xport *rmi_i2c = i2c_get_clientdata(client);
	int ret;

	enable_irq(rmi_i2c->irq);

	ret = rmi_driver_resume(rmi_i2c->xport.rmi_dev);
	if (ret)
	dev_warn(dev, "Failed to resume device: %d\n", ret);

	return 0;
	}
	#endif

	static const struct dev_pm_ops rmi_i2c_pm = {
	SET_SYSTEM_SLEEP_PM_OPS(rmi_i2c_suspend, rmi_i2c_resume)
	SET_RUNTIME_PM_OPS(rmi_i2c_runtime_suspend, rmi_i2c_runtime_resume,
	NULL)
	};

	static const struct i2c_device_id rmi_id[] = {
	{ "rmi4_i2c", 0 },
	{ }
	};
	MODULE_DEVICE_TABLE(i2c, rmi_id);

	static struct i2c_driver rmi_i2c_driver = {
	.driver = {
	.name = "rmi4_i2c",
	.pm = &rmi_i2c_pm,
	.of_match_table = of_match_ptr(rmi_i2c_of_match),
	},
	.id_table = rmi_id,
	.probe = rmi_i2c_probe,
	.remove = rmi_i2c_remove,
	};

	module_i2c_driver(rmi_i2c_driver);

	MODULE_AUTHOR("Christopher Heiny <cheiny@synaptics.com>");
	MODULE_AUTHOR("Andrew Duggan <aduggan@synaptics.com>");
	MODULE_DESCRIPTION("RMI I2C driver");
	MODULE_LICENSE("GPL");
	MODULE_VERSION(RMI_DRIVER_VERSION);