[thirdparty/kernel/stable.git] / drivers / input / rmi4 / rmi_smbus.c

// SPDX-License-Identifier: GPL-2.0-only
/*
 * Copyright (c) 2015 - 2016 Red Hat, Inc
 * Copyright (c) 2011, 2012 Synaptics Incorporated
 * Copyright (c) 2011 Unixphere
 */

#include <linux/kernel.h>
#include <linux/delay.h>
#include <linux/i2c.h>
#include <linux/interrupt.h>
#include <linux/kconfig.h>
#include <linux/lockdep.h>
#include <linux/module.h>
#include <linux/pm.h>
#include <linux/rmi.h>
#include <linux/slab.h>
#include "rmi_driver.h"

#define SMB_PROTOCOL_VERSION_ADDRESS	0xfd
#define SMB_MAX_COUNT			32
#define RMI_SMB2_MAP_SIZE		8 /* 8 entry of 4 bytes each */
#define RMI_SMB2_MAP_FLAGS_WE		0x01

struct mapping_table_entry {
	__le16 rmiaddr;
	u8 readcount;
	u8 flags;
};

struct rmi_smb_xport {
	struct rmi_transport_dev xport;
	struct i2c_client *client;

	struct mutex page_mutex;
	int page;
	u8 table_index;
	struct mutex mappingtable_mutex;
	struct mapping_table_entry mapping_table[RMI_SMB2_MAP_SIZE];
};

static int rmi_smb_get_version(struct rmi_smb_xport *rmi_smb)
{
	struct i2c_client *client = rmi_smb->client;
	int retval;

	/* Check if for SMBus new version device by reading version byte. */
	retval = i2c_smbus_read_byte_data(client, SMB_PROTOCOL_VERSION_ADDRESS);
	if (retval < 0) {
		dev_err(&client->dev, "failed to get SMBus version number!\n");
		return retval;
	}

	return retval + 1;
}

/* SMB block write - wrapper over ic2_smb_write_block */
static int smb_block_write(struct rmi_transport_dev *xport,
			      u8 commandcode, const void *buf, size_t len)
{
	struct rmi_smb_xport *rmi_smb =
		container_of(xport, struct rmi_smb_xport, xport);
	struct i2c_client *client = rmi_smb->client;
	int retval;

	retval = i2c_smbus_write_block_data(client, commandcode, len, buf);

	rmi_dbg(RMI_DEBUG_XPORT, &client->dev,
		"wrote %zd bytes at %#04x: %d (%*ph)\n",
		len, commandcode, retval, (int)len, buf);

	return retval;
}

/*
 * The function to get command code for smbus operations and keeps
 * records to the driver mapping table
 */
static int rmi_smb_get_command_code(struct rmi_transport_dev *xport,
		u16 rmiaddr, int bytecount, bool isread, u8 *commandcode)
{
	struct rmi_smb_xport *rmi_smb =
		container_of(xport, struct rmi_smb_xport, xport);
	struct mapping_table_entry new_map;
	int i;
	int retval = 0;

	mutex_lock(&rmi_smb->mappingtable_mutex);

	for (i = 0; i < RMI_SMB2_MAP_SIZE; i++) {
		struct mapping_table_entry *entry = &rmi_smb->mapping_table[i];

		if (le16_to_cpu(entry->rmiaddr) == rmiaddr) {
			if (isread) {
				if (entry->readcount == bytecount)
					goto exit;
			} else {
				if (entry->flags & RMI_SMB2_MAP_FLAGS_WE) {
					goto exit;
				}
			}
		}
	}

	i = rmi_smb->table_index;
	rmi_smb->table_index = (i + 1) % RMI_SMB2_MAP_SIZE;

	/* constructs mapping table data entry. 4 bytes each entry */
	memset(&new_map, 0, sizeof(new_map));
	new_map.rmiaddr = cpu_to_le16(rmiaddr);
	new_map.readcount = bytecount;
	new_map.flags = !isread ? RMI_SMB2_MAP_FLAGS_WE : 0;

	retval = smb_block_write(xport, i + 0x80, &new_map, sizeof(new_map));
	if (retval < 0) {
		/*
		 * if not written to device mapping table
		 * clear the driver mapping table records
		 */
		memset(&new_map, 0, sizeof(new_map));
	}

	/* save to the driver level mapping table */
	rmi_smb->mapping_table[i] = new_map;

exit:
	mutex_unlock(&rmi_smb->mappingtable_mutex);

	if (retval < 0)
		return retval;

	*commandcode = i;
	return 0;
}

static int rmi_smb_write_block(struct rmi_transport_dev *xport, u16 rmiaddr,
				const void *databuff, size_t len)
{
	int retval = 0;
	u8 commandcode;
	struct rmi_smb_xport *rmi_smb =
		container_of(xport, struct rmi_smb_xport, xport);
	int cur_len = (int)len;

	mutex_lock(&rmi_smb->page_mutex);

	while (cur_len > 0) {
		/*
		 * break into 32 bytes chunks to write get command code
		 */
		int block_len = min_t(int, len, SMB_MAX_COUNT);

		retval = rmi_smb_get_command_code(xport, rmiaddr, block_len,
						  false, &commandcode);
		if (retval < 0)
			goto exit;

		retval = smb_block_write(xport, commandcode,
					 databuff, block_len);
		if (retval < 0)
			goto exit;

		/* prepare to write next block of bytes */
		cur_len -= SMB_MAX_COUNT;
		databuff += SMB_MAX_COUNT;
		rmiaddr += SMB_MAX_COUNT;
	}
exit:
	mutex_unlock(&rmi_smb->page_mutex);
	return retval;
}

/* SMB block read - wrapper over ic2_smb_read_block */
static int smb_block_read(struct rmi_transport_dev *xport,
			     u8 commandcode, void *buf, size_t len)
{
	struct rmi_smb_xport *rmi_smb =
		container_of(xport, struct rmi_smb_xport, xport);
	struct i2c_client *client = rmi_smb->client;
	int retval;

	retval = i2c_smbus_read_block_data(client, commandcode, buf);
	if (retval < 0)
		return retval;

	return retval;
}

static int rmi_smb_read_block(struct rmi_transport_dev *xport, u16 rmiaddr,
			      void *databuff, size_t len)
{
	struct rmi_smb_xport *rmi_smb =
		container_of(xport, struct rmi_smb_xport, xport);
	int retval;
	u8 commandcode;
	int cur_len = (int)len;

	mutex_lock(&rmi_smb->page_mutex);
	memset(databuff, 0, len);

	while (cur_len > 0) {
		/* break into 32 bytes chunks to write get command code */
		int block_len =  min_t(int, cur_len, SMB_MAX_COUNT);

		retval = rmi_smb_get_command_code(xport, rmiaddr, block_len,
						  true, &commandcode);
		if (retval < 0)
			goto exit;

		retval = smb_block_read(xport, commandcode,
					databuff, block_len);
		if (retval < 0)
			goto exit;

		/* prepare to read next block of bytes */
		cur_len -= SMB_MAX_COUNT;
		databuff += SMB_MAX_COUNT;
		rmiaddr += SMB_MAX_COUNT;
	}

	retval = 0;

exit:
	mutex_unlock(&rmi_smb->page_mutex);
	return retval;
}

static void rmi_smb_clear_state(struct rmi_smb_xport *rmi_smb)
{
	/* the mapping table has been flushed, discard the current one */
	mutex_lock(&rmi_smb->mappingtable_mutex);
	memset(rmi_smb->mapping_table, 0, sizeof(rmi_smb->mapping_table));
	mutex_unlock(&rmi_smb->mappingtable_mutex);
}

static int rmi_smb_enable_smbus_mode(struct rmi_smb_xport *rmi_smb)
{
	int retval;

	/* we need to get the smbus version to activate the touchpad */
	retval = rmi_smb_get_version(rmi_smb);
	if (retval < 0)
		return retval;

	return 0;
}

static int rmi_smb_reset(struct rmi_transport_dev *xport, u16 reset_addr)
{
	struct rmi_smb_xport *rmi_smb =
		container_of(xport, struct rmi_smb_xport, xport);

	rmi_smb_clear_state(rmi_smb);

	/*
	 * we do not call the actual reset command, it has to be handled in
	 * PS/2 or there will be races between PS/2 and SMBus.
	 * PS/2 should ensure that a psmouse_reset is called before
	 * intializing the device and after it has been removed to be in a known
	 * state.
	 */
	return rmi_smb_enable_smbus_mode(rmi_smb);
}

static const struct rmi_transport_ops rmi_smb_ops = {
	.write_block	= rmi_smb_write_block,
	.read_block	= rmi_smb_read_block,
	.reset		= rmi_smb_reset,
};

static int rmi_smb_probe(struct i2c_client *client,
			 const struct i2c_device_id *id)
{
	struct rmi_device_platform_data *pdata = dev_get_platdata(&client->dev);
	struct rmi_smb_xport *rmi_smb;
	int smbus_version;
	int error;

	if (!pdata) {
		dev_err(&client->dev, "no platform data, aborting\n");
		return -ENOMEM;
	}

	if (!i2c_check_functionality(client->adapter,
				     I2C_FUNC_SMBUS_READ_BLOCK_DATA |
				     I2C_FUNC_SMBUS_HOST_NOTIFY)) {
		dev_err(&client->dev,
			"adapter does not support required functionality\n");
		return -ENODEV;
	}

	if (client->irq <= 0) {
		dev_err(&client->dev, "no IRQ provided, giving up\n");
		return client->irq ? client->irq : -ENODEV;
	}

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

	rmi_dbg(RMI_DEBUG_XPORT, &client->dev, "Probing %s\n",
		dev_name(&client->dev));

	rmi_smb->client = client;
	mutex_init(&rmi_smb->page_mutex);
	mutex_init(&rmi_smb->mappingtable_mutex);

	rmi_smb->xport.dev = &client->dev;
	rmi_smb->xport.pdata = *pdata;
	rmi_smb->xport.pdata.irq = client->irq;
	rmi_smb->xport.proto_name = "smb";
	rmi_smb->xport.ops = &rmi_smb_ops;

	smbus_version = rmi_smb_get_version(rmi_smb);
	if (smbus_version < 0)
		return smbus_version;

	rmi_dbg(RMI_DEBUG_XPORT, &client->dev, "Smbus version is %d",
		smbus_version);

	if (smbus_version != 2 && smbus_version != 3) {
		dev_err(&client->dev, "Unrecognized SMB version %d\n",
				smbus_version);
		return -ENODEV;
	}

	i2c_set_clientdata(client, rmi_smb);

	dev_info(&client->dev, "registering SMbus-connected sensor\n");

	error = rmi_register_transport_device(&rmi_smb->xport);
	if (error) {
		dev_err(&client->dev, "failed to register sensor: %d\n", error);
		return error;
	}

	return 0;
}

static int rmi_smb_remove(struct i2c_client *client)
{
	struct rmi_smb_xport *rmi_smb = i2c_get_clientdata(client);

	rmi_unregister_transport_device(&rmi_smb->xport);

	return 0;
}

static int __maybe_unused rmi_smb_suspend(struct device *dev)
{
	struct i2c_client *client = to_i2c_client(dev);
	struct rmi_smb_xport *rmi_smb = i2c_get_clientdata(client);
	int ret;

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

	return ret;
}

static int __maybe_unused rmi_smb_runtime_suspend(struct device *dev)
{
	struct i2c_client *client = to_i2c_client(dev);
	struct rmi_smb_xport *rmi_smb = i2c_get_clientdata(client);
	int ret;

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

	return ret;
}

static int __maybe_unused rmi_smb_resume(struct device *dev)
{
	struct i2c_client *client = container_of(dev, struct i2c_client, dev);
	struct rmi_smb_xport *rmi_smb = i2c_get_clientdata(client);
	struct rmi_device *rmi_dev = rmi_smb->xport.rmi_dev;
	int ret;

	rmi_smb_reset(&rmi_smb->xport, 0);

	rmi_reset(rmi_dev);

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

	return 0;
}

static int __maybe_unused rmi_smb_runtime_resume(struct device *dev)
{
	struct i2c_client *client = to_i2c_client(dev);
	struct rmi_smb_xport *rmi_smb = i2c_get_clientdata(client);
	int ret;

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

	return 0;
}

static const struct dev_pm_ops rmi_smb_pm = {
	SET_SYSTEM_SLEEP_PM_OPS(rmi_smb_suspend, rmi_smb_resume)
	SET_RUNTIME_PM_OPS(rmi_smb_runtime_suspend, rmi_smb_runtime_resume,
			   NULL)
};

static const struct i2c_device_id rmi_id[] = {
	{ "rmi4_smbus", 0 },
	{ }
};
MODULE_DEVICE_TABLE(i2c, rmi_id);

static struct i2c_driver rmi_smb_driver = {
	.driver = {
		.name	= "rmi4_smbus",
		.pm	= &rmi_smb_pm,
	},
	.id_table	= rmi_id,
	.probe		= rmi_smb_probe,
	.remove		= rmi_smb_remove,
};

module_i2c_driver(rmi_smb_driver);

MODULE_AUTHOR("Andrew Duggan <aduggan@synaptics.com>");
MODULE_AUTHOR("Benjamin Tissoires <benjamin.tissoires@redhat.com>");
MODULE_DESCRIPTION("RMI4 SMBus driver");
MODULE_LICENSE("GPL");
Commit	Line	Data
d2912cb1	1	// SPDX-License-Identifier: GPL-2.0-only
82264d0c BT	2	/*
	3	* Copyright (c) 2015 - 2016 Red Hat, Inc
	4	* Copyright (c) 2011, 2012 Synaptics Incorporated
	5	* Copyright (c) 2011 Unixphere
82264d0c BT	6	*/
	7
	8	#include <linux/kernel.h>
	9	#include <linux/delay.h>
	10	#include <linux/i2c.h>
	11	#include <linux/interrupt.h>
	12	#include <linux/kconfig.h>
	13	#include <linux/lockdep.h>
	14	#include <linux/module.h>
	15	#include <linux/pm.h>
	16	#include <linux/rmi.h>
	17	#include <linux/slab.h>
	18	#include "rmi_driver.h"
	19
	20	#define SMB_PROTOCOL_VERSION_ADDRESS 0xfd
	21	#define SMB_MAX_COUNT 32
	22	#define RMI_SMB2_MAP_SIZE 8 /* 8 entry of 4 bytes each */
	23	#define RMI_SMB2_MAP_FLAGS_WE 0x01
	24
	25	struct mapping_table_entry {
	26	__le16 rmiaddr;
	27	u8 readcount;
	28	u8 flags;
	29	};
	30
	31	struct rmi_smb_xport {
	32	struct rmi_transport_dev xport;
	33	struct i2c_client *client;
	34
	35	struct mutex page_mutex;
	36	int page;
	37	u8 table_index;
	38	struct mutex mappingtable_mutex;
	39	struct mapping_table_entry mapping_table[RMI_SMB2_MAP_SIZE];
	40	};
	41
	42	static int rmi_smb_get_version(struct rmi_smb_xport *rmi_smb)
	43	{
	44	struct i2c_client *client = rmi_smb->client;
	45	int retval;
	46
	47	/* Check if for SMBus new version device by reading version byte. */
	48	retval = i2c_smbus_read_byte_data(client, SMB_PROTOCOL_VERSION_ADDRESS);
	49	if (retval < 0) {
	50	dev_err(&client->dev, "failed to get SMBus version number!\n");
	51	return retval;
	52	}
54bf0894	53
82264d0c BT	54	return retval + 1;
	55	}
	56
	57	/* SMB block write - wrapper over ic2_smb_write_block */
	58	static int smb_block_write(struct rmi_transport_dev *xport,
	59	u8 commandcode, const void *buf, size_t len)
	60	{
	61	struct rmi_smb_xport *rmi_smb =
	62	container_of(xport, struct rmi_smb_xport, xport);
	63	struct i2c_client *client = rmi_smb->client;
	64	int retval;
	65
	66	retval = i2c_smbus_write_block_data(client, commandcode, len, buf);
	67
	68	rmi_dbg(RMI_DEBUG_XPORT, &client->dev,
	69	"wrote %zd bytes at %#04x: %d (%*ph)\n",
	70	len, commandcode, retval, (int)len, buf);
	71
	72	return retval;
	73	}
	74
	75	/*
	76	* The function to get command code for smbus operations and keeps
	77	* records to the driver mapping table
	78	*/
	79	static int rmi_smb_get_command_code(struct rmi_transport_dev *xport,
	80	u16 rmiaddr, int bytecount, bool isread, u8 *commandcode)
	81	{
	82	struct rmi_smb_xport *rmi_smb =
	83	container_of(xport, struct rmi_smb_xport, xport);
8a7c71ae	84	struct mapping_table_entry new_map;
82264d0c	85	int i;
8a7c71ae	86	int retval = 0;
82264d0c BT	87
82264d0c BT	88	mutex_lock(&rmi_smb->mappingtable_mutex);
8a7c71ae	89
82264d0c	90	for (i = 0; i < RMI_SMB2_MAP_SIZE; i++) {
2593cd11 DT	91	struct mapping_table_entry *entry = &rmi_smb->mapping_table[i];
	92
	93	if (le16_to_cpu(entry->rmiaddr) == rmiaddr) {
82264d0c	94	if (isread) {
8a7c71ae	95	if (entry->readcount == bytecount)
82264d0c	96	goto exit;
82264d0c	97	} else {
2593cd11	98	if (entry->flags & RMI_SMB2_MAP_FLAGS_WE) {
82264d0c BT	99	goto exit;
	100	}
	101	}
	102	}
	103	}
8a7c71ae	104
82264d0c BT	105	i = rmi_smb->table_index;
	106	rmi_smb->table_index = (i + 1) % RMI_SMB2_MAP_SIZE;
	107
	108	/* constructs mapping table data entry. 4 bytes each entry */
8a7c71ae DT	109	memset(&new_map, 0, sizeof(new_map));
	110	new_map.rmiaddr = cpu_to_le16(rmiaddr);
	111	new_map.readcount = bytecount;
	112	new_map.flags = !isread ? RMI_SMB2_MAP_FLAGS_WE : 0;
82264d0c	113
8a7c71ae	114	retval = smb_block_write(xport, i + 0x80, &new_map, sizeof(new_map));
82264d0c BT	115	if (retval < 0) {
	116	/*
	117	* if not written to device mapping table
	118	* clear the driver mapping table records
	119	*/
8a7c71ae	120	memset(&new_map, 0, sizeof(new_map));
82264d0c	121	}
8a7c71ae	122
82264d0c	123	/* save to the driver level mapping table */
8a7c71ae	124	rmi_smb->mapping_table[i] = new_map;
82264d0c BT	125
	126	exit:
	127	mutex_unlock(&rmi_smb->mappingtable_mutex);
	128
8a7c71ae DT	129	if (retval < 0)
	130	return retval;
	131
	132	*commandcode = i;
	133	return 0;
82264d0c BT	134	}
	135
	136	static int rmi_smb_write_block(struct rmi_transport_dev *xport, u16 rmiaddr,
	137	const void *databuff, size_t len)
	138	{
	139	int retval = 0;
	140	u8 commandcode;
	141	struct rmi_smb_xport *rmi_smb =
	142	container_of(xport, struct rmi_smb_xport, xport);
	143	int cur_len = (int)len;
	144
	145	mutex_lock(&rmi_smb->page_mutex);
	146
	147	while (cur_len > 0) {
	148	/*
	149	* break into 32 bytes chunks to write get command code
	150	*/
	151	int block_len = min_t(int, len, SMB_MAX_COUNT);
	152
	153	retval = rmi_smb_get_command_code(xport, rmiaddr, block_len,
	154	false, &commandcode);
	155	if (retval < 0)
	156	goto exit;
	157
	158	retval = smb_block_write(xport, commandcode,
	159	databuff, block_len);
	160	if (retval < 0)
	161	goto exit;
	162
	163	/* prepare to write next block of bytes */
	164	cur_len -= SMB_MAX_COUNT;
	165	databuff += SMB_MAX_COUNT;
	166	rmiaddr += SMB_MAX_COUNT;
	167	}
	168	exit:
	169	mutex_unlock(&rmi_smb->page_mutex);
	170	return retval;
	171	}
	172
	173	/* SMB block read - wrapper over ic2_smb_read_block */
	174	static int smb_block_read(struct rmi_transport_dev *xport,
	175	u8 commandcode, void *buf, size_t len)
	176	{
	177	struct rmi_smb_xport *rmi_smb =
	178	container_of(xport, struct rmi_smb_xport, xport);
	179	struct i2c_client *client = rmi_smb->client;
	180	int retval;
	181
	182	retval = i2c_smbus_read_block_data(client, commandcode, buf);
	183	if (retval < 0)
	184	return retval;
	185
	186	return retval;
	187	}
	188
	189	static int rmi_smb_read_block(struct rmi_transport_dev *xport, u16 rmiaddr,
	190	void *databuff, size_t len)
	191	{
	192	struct rmi_smb_xport *rmi_smb =
	193	container_of(xport, struct rmi_smb_xport, xport);
	194	int retval;
	195	u8 commandcode;
	196	int cur_len = (int)len;
	197
198	mutex_lock(&rmi_smb->page_mutex);
199	memset(databuff, 0, len);
200
201	while (cur_len > 0) {
202	/* break into 32 bytes chunks to write get command code */
203	int block_len = min_t(int, cur_len, SMB_MAX_COUNT);
204
205	retval = rmi_smb_get_command_code(xport, rmiaddr, block_len,
206	true, &commandcode);
207	if (retval < 0)
208	goto exit;
209
210	retval = smb_block_read(xport, commandcode,
211	databuff, block_len);
212	if (retval < 0)
213	goto exit;
214
215	/* prepare to read next block of bytes */
216	cur_len -= SMB_MAX_COUNT;
217	databuff += SMB_MAX_COUNT;
218	rmiaddr += SMB_MAX_COUNT;
219	}
220
221	retval = 0;
222
223	exit:
224	mutex_unlock(&rmi_smb->page_mutex);
225	return retval;
226	}
227
228	static void rmi_smb_clear_state(struct rmi_smb_xport *rmi_smb)
229	{
230	/* the mapping table has been flushed, discard the current one */
231	mutex_lock(&rmi_smb->mappingtable_mutex);
232	memset(rmi_smb->mapping_table, 0, sizeof(rmi_smb->mapping_table));
233	mutex_unlock(&rmi_smb->mappingtable_mutex);
234	}
235
236	static int rmi_smb_enable_smbus_mode(struct rmi_smb_xport *rmi_smb)
237	{
238	int retval;
239
240	/* we need to get the smbus version to activate the touchpad */
241	retval = rmi_smb_get_version(rmi_smb);
242	if (retval < 0)
243	return retval;
244
245	return 0;
246	}
247
248	static int rmi_smb_reset(struct rmi_transport_dev *xport, u16 reset_addr)
249	{
250	struct rmi_smb_xport *rmi_smb =
251	container_of(xport, struct rmi_smb_xport, xport);
252
253	rmi_smb_clear_state(rmi_smb);
254
255	/*
256	* we do not call the actual reset command, it has to be handled in
257	* PS/2 or there will be races between PS/2 and SMBus.
258	* PS/2 should ensure that a psmouse_reset is called before
259	* intializing the device and after it has been removed to be in a known
260	* state.
261	*/
262	return rmi_smb_enable_smbus_mode(rmi_smb);
263	}
264
265	static const struct rmi_transport_ops rmi_smb_ops = {
266	.write_block = rmi_smb_write_block,
267	.read_block = rmi_smb_read_block,
268	.reset = rmi_smb_reset,
269	};
270
271	static int rmi_smb_probe(struct i2c_client *client,
272	const struct i2c_device_id *id)
273	{
274	struct rmi_device_platform_data *pdata = dev_get_platdata(&client->dev);
275	struct rmi_smb_xport *rmi_smb;
82264d0c	276	int smbus_version;
54bf0894 DT	277	int error;
	278
	279	if (!pdata) {
	280	dev_err(&client->dev, "no platform data, aborting\n");
	281	return -ENOMEM;
	282	}
82264d0c BT	283
	284	if (!i2c_check_functionality(client->adapter,
	285	I2C_FUNC_SMBUS_READ_BLOCK_DATA \|
	286	I2C_FUNC_SMBUS_HOST_NOTIFY)) {
	287	dev_err(&client->dev,
54bf0894	288	"adapter does not support required functionality\n");
82264d0c BT	289	return -ENODEV;
	290	}
	291
	292	if (client->irq <= 0) {
54bf0894	293	dev_err(&client->dev, "no IRQ provided, giving up\n");
82264d0c BT	294	return client->irq ? client->irq : -ENODEV;
	295	}
	296
	297	rmi_smb = devm_kzalloc(&client->dev, sizeof(struct rmi_smb_xport),
	298	GFP_KERNEL);
	299	if (!rmi_smb)
	300	return -ENOMEM;
	301
54bf0894	302	rmi_dbg(RMI_DEBUG_XPORT, &client->dev, "Probing %s\n",
82264d0c BT	303	dev_name(&client->dev));
	304
	305	rmi_smb->client = client;
	306	mutex_init(&rmi_smb->page_mutex);
	307	mutex_init(&rmi_smb->mappingtable_mutex);
	308
	309	rmi_smb->xport.dev = &client->dev;
	310	rmi_smb->xport.pdata = *pdata;
	311	rmi_smb->xport.pdata.irq = client->irq;
26dd633e	312	rmi_smb->xport.proto_name = "smb";
82264d0c BT	313	rmi_smb->xport.ops = &rmi_smb_ops;
82264d0c BT	314
54bf0894 DT	315	smbus_version = rmi_smb_get_version(rmi_smb);
	316	if (smbus_version < 0)
	317	return smbus_version;
82264d0c	318
82264d0c BT	319	rmi_dbg(RMI_DEBUG_XPORT, &client->dev, "Smbus version is %d",
	320	smbus_version);
	321
26dd633e	322	if (smbus_version != 2 && smbus_version != 3) {
54bf0894	323	dev_err(&client->dev, "Unrecognized SMB version %d\n",
82264d0c BT	324	smbus_version);
	325	return -ENODEV;
	326	}
	327
	328	i2c_set_clientdata(client, rmi_smb);
	329
54bf0894 DT	330	dev_info(&client->dev, "registering SMbus-connected sensor\n");
	331
	332	error = rmi_register_transport_device(&rmi_smb->xport);
	333	if (error) {
	334	dev_err(&client->dev, "failed to register sensor: %d\n", error);
	335	return error;
82264d0c BT	336	}
82264d0c BT	337
82264d0c	338	return 0;
82264d0c BT	339	}
	340
	341	static int rmi_smb_remove(struct i2c_client *client)
	342	{
	343	struct rmi_smb_xport *rmi_smb = i2c_get_clientdata(client);
	344
	345	rmi_unregister_transport_device(&rmi_smb->xport);
	346
	347	return 0;
	348	}
	349
	350	static int __maybe_unused rmi_smb_suspend(struct device *dev)
	351	{
	352	struct i2c_client *client = to_i2c_client(dev);
	353	struct rmi_smb_xport *rmi_smb = i2c_get_clientdata(client);
	354	int ret;
	355
	356	ret = rmi_driver_suspend(rmi_smb->xport.rmi_dev, true);
	357	if (ret)
	358	dev_warn(dev, "Failed to suspend device: %d\n", ret);
	359
	360	return ret;
	361	}
	362
	363	static int __maybe_unused rmi_smb_runtime_suspend(struct device *dev)
	364	{
	365	struct i2c_client *client = to_i2c_client(dev);
	366	struct rmi_smb_xport *rmi_smb = i2c_get_clientdata(client);
	367	int ret;
	368
	369	ret = rmi_driver_suspend(rmi_smb->xport.rmi_dev, false);
	370	if (ret)
	371	dev_warn(dev, "Failed to suspend device: %d\n", ret);
	372
	373	return ret;
	374	}
	375
	376	static int __maybe_unused rmi_smb_resume(struct device *dev)
	377	{
	378	struct i2c_client *client = container_of(dev, struct i2c_client, dev);
	379	struct rmi_smb_xport *rmi_smb = i2c_get_clientdata(client);
	380	struct rmi_device *rmi_dev = rmi_smb->xport.rmi_dev;
	381	int ret;
	382
	383	rmi_smb_reset(&rmi_smb->xport, 0);
	384
	385	rmi_reset(rmi_dev);
	386
	387	ret = rmi_driver_resume(rmi_smb->xport.rmi_dev, true);
	388	if (ret)
	389	dev_warn(dev, "Failed to resume device: %d\n", ret);
	390
	391	return 0;
	392	}
	393
	394	static int __maybe_unused rmi_smb_runtime_resume(struct device *dev)
	395	{
	396	struct i2c_client *client = to_i2c_client(dev);
	397	struct rmi_smb_xport *rmi_smb = i2c_get_clientdata(client);
	398	int ret;
	399
	400	ret = rmi_driver_resume(rmi_smb->xport.rmi_dev, false);
	401	if (ret)
	402	dev_warn(dev, "Failed to resume device: %d\n", ret);
403
404	return 0;
405	}
406
407	static const struct dev_pm_ops rmi_smb_pm = {
408	SET_SYSTEM_SLEEP_PM_OPS(rmi_smb_suspend, rmi_smb_resume)
409	SET_RUNTIME_PM_OPS(rmi_smb_runtime_suspend, rmi_smb_runtime_resume,
410	NULL)
411	};
412
413	static const struct i2c_device_id rmi_id[] = {
414	{ "rmi4_smbus", 0 },
415	{ }
416	};
417	MODULE_DEVICE_TABLE(i2c, rmi_id);
418
419	static struct i2c_driver rmi_smb_driver = {
420	.driver = {
421	.name = "rmi4_smbus",
422	.pm = &rmi_smb_pm,
423	},
424	.id_table = rmi_id,
425	.probe = rmi_smb_probe,
426	.remove = rmi_smb_remove,
427	};
428
429	module_i2c_driver(rmi_smb_driver);
430
431	MODULE_AUTHOR("Andrew Duggan <aduggan@synaptics.com>");
432	MODULE_AUTHOR("Benjamin Tissoires <benjamin.tissoires@redhat.com>");
433	MODULE_DESCRIPTION("RMI4 SMBus driver");
434	MODULE_LICENSE("GPL");