[deliverable/linux.git] / drivers / misc / mei / wd.c

/*
 *
 * Intel Management Engine Interface (Intel MEI) Linux driver
 * Copyright (c) 2003-2012, Intel Corporation.
 *
 * This program is free software; you can redistribute it and/or modify it
 * under the terms and conditions of the GNU General Public License,
 * version 2, as published by the Free Software Foundation.
 *
 * This program is distributed in the hope 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/kernel.h>
#include <linux/module.h>
#include <linux/moduleparam.h>
#include <linux/device.h>
#include <linux/pci.h>
#include <linux/sched.h>
#include <linux/watchdog.h>

#include "mei_dev.h"
#include "hw.h"
#include "interface.h"
#include <linux/mei.h>

static const u8 mei_start_wd_params[] = { 0x02, 0x12, 0x13, 0x10 };
static const u8 mei_stop_wd_params[] = { 0x02, 0x02, 0x14, 0x10 };

const u8 mei_wd_state_independence_msg[3][4] = {
	{0x05, 0x02, 0x51, 0x10},
	{0x05, 0x02, 0x52, 0x10},
	{0x07, 0x02, 0x01, 0x10}
};

/*
 * AMT Watchdog Device
 */
#define INTEL_AMT_WATCHDOG_ID "INTCAMT"

/* UUIDs for AMT F/W clients */
const uuid_le mei_wd_guid = UUID_LE(0x05B79A6F, 0x4628, 0x4D7F, 0x89,
						0x9D, 0xA9, 0x15, 0x14, 0xCB,
						0x32, 0xAB);

static void mei_wd_set_start_timeout(struct mei_device *dev, u16 timeout)
{
	dev_dbg(&dev->pdev->dev, "wd: set timeout=%d.\n", timeout);
	memcpy(dev->wd_data, mei_start_wd_params, MEI_WD_PARAMS_SIZE);
	memcpy(dev->wd_data + MEI_WD_PARAMS_SIZE, &timeout, sizeof(u16));
}

/**
 * host_init_wd - mei initialization wd.
 *
 * @dev: the device structure
 * returns -ENENT if wd client cannot be found
 *         -EIO if write has failed
 */
int mei_wd_host_init(struct mei_device *dev)
{
	mei_cl_init(&dev->wd_cl, dev);

	/* look for WD client and connect to it */
	dev->wd_cl.state = MEI_FILE_DISCONNECTED;
	dev->wd_timeout = AMT_WD_DEFAULT_TIMEOUT;

	/* find ME WD client */
	mei_find_me_client_update_filext(dev, &dev->wd_cl,
				&mei_wd_guid, MEI_WD_HOST_CLIENT_ID);

	dev_dbg(&dev->pdev->dev, "wd: check client\n");
	if (MEI_FILE_CONNECTING != dev->wd_cl.state) {
		dev_info(&dev->pdev->dev, "wd: failed to find the client\n");
		return -ENOENT;
	}

	if (mei_connect(dev, &dev->wd_cl)) {
		dev_err(&dev->pdev->dev, "wd: failed to connect to the client\n");
		dev->wd_cl.state = MEI_FILE_DISCONNECTED;
		dev->wd_cl.host_client_id = 0;
		return -EIO;
	}
	dev->wd_cl.timer_count = CONNECT_TIMEOUT;

	return 0;
}

/**
 * mei_wd_send - sends watch dog message to fw.
 *
 * @dev: the device structure
 *
 * returns 0 if success,
 *	-EIO when message send fails
 *	-EINVAL when invalid message is to be sent
 */
int mei_wd_send(struct mei_device *dev)
{
	struct mei_msg_hdr *mei_hdr;

	mei_hdr = (struct mei_msg_hdr *) &dev->wr_msg_buf[0];
	mei_hdr->host_addr = dev->wd_cl.host_client_id;
	mei_hdr->me_addr = dev->wd_cl.me_client_id;
	mei_hdr->msg_complete = 1;
	mei_hdr->reserved = 0;

	if (!memcmp(dev->wd_data, mei_start_wd_params, MEI_WD_PARAMS_SIZE))
		mei_hdr->length = MEI_START_WD_DATA_SIZE;
	else if (!memcmp(dev->wd_data, mei_stop_wd_params, MEI_WD_PARAMS_SIZE))
		mei_hdr->length = MEI_WD_PARAMS_SIZE;
	else
		return -EINVAL;

	return mei_write_message(dev, mei_hdr, dev->wd_data, mei_hdr->length);
}

/**
 * mei_wd_stop - sends watchdog stop message to fw.
 *
 * @dev: the device structure
 * @preserve: indicate if to keep the timeout value
 *
 * returns 0 if success,
 *	-EIO when message send fails
 *	-EINVAL when invalid message is to be sent
 */
int mei_wd_stop(struct mei_device *dev, bool preserve)
{
	int ret;
	u16 wd_timeout = dev->wd_timeout;

	cancel_delayed_work(&dev->timer_work);
	if (dev->wd_cl.state != MEI_FILE_CONNECTED || !dev->wd_timeout)
		return 0;

	dev->wd_timeout = 0;
	dev->wd_due_counter = 0;
	memcpy(dev->wd_data, mei_stop_wd_params, MEI_WD_PARAMS_SIZE);
	dev->stop = true;

	ret = mei_flow_ctrl_creds(dev, &dev->wd_cl);
	if (ret < 0)
		goto out;

	if (ret && dev->mei_host_buffer_is_empty) {
		ret = 0;
		dev->mei_host_buffer_is_empty = false;

		if (!mei_wd_send(dev)) {
			ret = mei_flow_ctrl_reduce(dev, &dev->wd_cl);
			if (ret)
				goto out;
		} else {
			dev_err(&dev->pdev->dev, "wd: send stop failed\n");
		}

		dev->wd_pending = false;
	} else {
		dev->wd_pending = true;
	}
	dev->wd_stopped = false;
	mutex_unlock(&dev->device_lock);

	ret = wait_event_interruptible_timeout(dev->wait_stop_wd,
					dev->wd_stopped, 10 * HZ);
	mutex_lock(&dev->device_lock);
	if (dev->wd_stopped) {
		dev_dbg(&dev->pdev->dev, "wd: stop completed ret=%d.\n", ret);
		ret = 0;
	} else {
		if (!ret)
			ret = -ETIMEDOUT;
		dev_warn(&dev->pdev->dev,
			"wd: stop failed to complete ret=%d.\n", ret);
	}

	if (preserve)
		dev->wd_timeout = wd_timeout;

out:
	return ret;
}

/*
 * mei_wd_ops_start - wd start command from the watchdog core.
 *
 * @wd_dev - watchdog device struct
 *
 * returns 0 if success, negative errno code for failure
 */
static int mei_wd_ops_start(struct watchdog_device *wd_dev)
{
	int err = -ENODEV;
	struct mei_device *dev;

	dev = pci_get_drvdata(mei_device);
	if (!dev)
		return -ENODEV;

	mutex_lock(&dev->device_lock);

	if (dev->mei_state != MEI_ENABLED) {
		dev_dbg(&dev->pdev->dev,
			"wd: mei_state != MEI_ENABLED  mei_state = %d\n",
			dev->mei_state);
		goto end_unlock;
	}

	if (dev->wd_cl.state != MEI_FILE_CONNECTED)	{
		dev_dbg(&dev->pdev->dev,
			"MEI Driver is not connected to Watchdog Client\n");
		goto end_unlock;
	}

	mei_wd_set_start_timeout(dev, dev->wd_timeout);

	err = 0;
end_unlock:
	mutex_unlock(&dev->device_lock);
	return err;
}

/*
 * mei_wd_ops_stop -  wd stop command from the watchdog core.
 *
 * @wd_dev - watchdog device struct
 *
 * returns 0 if success, negative errno code for failure
 */
static int mei_wd_ops_stop(struct watchdog_device *wd_dev)
{
	struct mei_device *dev;
	dev = pci_get_drvdata(mei_device);

	if (!dev)
		return -ENODEV;

	mutex_lock(&dev->device_lock);
	mei_wd_stop(dev, false);
	mutex_unlock(&dev->device_lock);

	return 0;
}

/*
 * mei_wd_ops_ping - wd ping command from the watchdog core.
 *
 * @wd_dev - watchdog device struct
 *
 * returns 0 if success, negative errno code for failure
 */
static int mei_wd_ops_ping(struct watchdog_device *wd_dev)
{
	int ret = 0;
	struct mei_device *dev;
	dev = pci_get_drvdata(mei_device);

	if (!dev)
		return -ENODEV;

	mutex_lock(&dev->device_lock);

	if (dev->wd_cl.state != MEI_FILE_CONNECTED) {
		dev_err(&dev->pdev->dev, "wd: not connected.\n");
		ret = -ENODEV;
		goto end;
	}

	/* Check if we can send the ping to HW*/
	if (dev->mei_host_buffer_is_empty &&
		mei_flow_ctrl_creds(dev, &dev->wd_cl) > 0) {

		dev->mei_host_buffer_is_empty = false;
		dev_dbg(&dev->pdev->dev, "wd: sending ping\n");

		if (mei_wd_send(dev)) {
			dev_err(&dev->pdev->dev, "wd: send failed.\n");
			ret = -EIO;
			goto end;
		}

		if (mei_flow_ctrl_reduce(dev, &dev->wd_cl)) {
			dev_err(&dev->pdev->dev,
				"wd: mei_flow_ctrl_reduce() failed.\n");
			ret = -EIO;
			goto end;
		}

	} else {
		dev->wd_pending = true;
	}

end:
	mutex_unlock(&dev->device_lock);
	return ret;
}

/*
 * mei_wd_ops_set_timeout - wd set timeout command from the watchdog core.
 *
 * @wd_dev - watchdog device struct
 * @timeout - timeout value to set
 *
 * returns 0 if success, negative errno code for failure
 */
static int mei_wd_ops_set_timeout(struct watchdog_device *wd_dev, unsigned int timeout)
{
	struct mei_device *dev;
	dev = pci_get_drvdata(mei_device);

	if (!dev)
		return -ENODEV;

	/* Check Timeout value */
	if (timeout < AMT_WD_MIN_TIMEOUT || timeout > AMT_WD_MAX_TIMEOUT)
		return -EINVAL;

	mutex_lock(&dev->device_lock);

	dev->wd_timeout = timeout;
	wd_dev->timeout = timeout;
	mei_wd_set_start_timeout(dev, dev->wd_timeout);

	mutex_unlock(&dev->device_lock);

	return 0;
}

/*
 * Watchdog Device structs
 */
static const struct watchdog_ops wd_ops = {
		.owner = THIS_MODULE,
		.start = mei_wd_ops_start,
		.stop = mei_wd_ops_stop,
		.ping = mei_wd_ops_ping,
		.set_timeout = mei_wd_ops_set_timeout,
};
static const struct watchdog_info wd_info = {
		.identity = INTEL_AMT_WATCHDOG_ID,
		.options = WDIOF_KEEPALIVEPING | WDIOF_ALARMONLY,
};

static struct watchdog_device amt_wd_dev = {
		.info = &wd_info,
		.ops = &wd_ops,
		.timeout = AMT_WD_DEFAULT_TIMEOUT,
		.min_timeout = AMT_WD_MIN_TIMEOUT,
		.max_timeout = AMT_WD_MAX_TIMEOUT,
};


void  mei_watchdog_register(struct mei_device *dev)
{
	dev_dbg(&dev->pdev->dev, "dev->wd_timeout =%d.\n", dev->wd_timeout);

	dev->wd_due_counter = !!dev->wd_timeout;

	if (watchdog_register_device(&amt_wd_dev)) {
		dev_err(&dev->pdev->dev,
			"wd: unable to register watchdog device.\n");
		dev->wd_interface_reg = false;
	} else {
		dev_dbg(&dev->pdev->dev,
			"wd: successfully register watchdog interface.\n");
		dev->wd_interface_reg = true;
	}
}

void mei_watchdog_unregister(struct mei_device *dev)
{
	if (dev->wd_interface_reg)
		watchdog_unregister_device(&amt_wd_dev);
	dev->wd_interface_reg = false;
}
Commit	Line	Data
3ceb3e66 OW	1	/*
	2	*
	3	* Intel Management Engine Interface (Intel MEI) Linux driver
733ba91c	4	* Copyright (c) 2003-2012, Intel Corporation.
3ceb3e66 OW	5	*
	6	* This program is free software; you can redistribute it and/or modify it
	7	* under the terms and conditions of the GNU General Public License,
	8	* version 2, as published by the Free Software Foundation.
	9	*
	10	* This program is distributed in the hope it will be useful, but WITHOUT
	11	* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
	12	* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
	13	* more details.
	14	*
	15	*/
	16	#include <linux/kernel.h>
	17	#include <linux/module.h>
	18	#include <linux/moduleparam.h>
	19	#include <linux/device.h>
	20	#include <linux/pci.h>
	21	#include <linux/sched.h>
9ce178e5	22	#include <linux/watchdog.h>
3ceb3e66 OW	23
	24	#include "mei_dev.h"
	25	#include "hw.h"
	26	#include "interface.h"
4f3afe1d	27	#include <linux/mei.h>
3ceb3e66	28
3ceb3e66 OW	29	static const u8 mei_start_wd_params[] = { 0x02, 0x12, 0x13, 0x10 };
	30	static const u8 mei_stop_wd_params[] = { 0x02, 0x02, 0x14, 0x10 };
	31
	32	const u8 mei_wd_state_independence_msg[3][4] = {
	33	{0x05, 0x02, 0x51, 0x10},
	34	{0x05, 0x02, 0x52, 0x10},
	35	{0x07, 0x02, 0x01, 0x10}
	36	};
	37
70cd5337 TW	38	/*
	39	* AMT Watchdog Device
	40	*/
	41	#define INTEL_AMT_WATCHDOG_ID "INTCAMT"
	42
3ceb3e66 OW	43	/* UUIDs for AMT F/W clients */
	44	const uuid_le mei_wd_guid = UUID_LE(0x05B79A6F, 0x4628, 0x4D7F, 0x89,
	45	0x9D, 0xA9, 0x15, 0x14, 0xCB,
	46	0x32, 0xAB);
	47
5192dda1	48	static void mei_wd_set_start_timeout(struct mei_device *dev, u16 timeout)
3ceb3e66	49	{
13c398aa	50	dev_dbg(&dev->pdev->dev, "wd: set timeout=%d.\n", timeout);
3ceb3e66	51	memcpy(dev->wd_data, mei_start_wd_params, MEI_WD_PARAMS_SIZE);
5192dda1	52	memcpy(dev->wd_data + MEI_WD_PARAMS_SIZE, &timeout, sizeof(u16));
3ceb3e66 OW	53	}
	54
	55	/**
	56	* host_init_wd - mei initialization wd.
	57	*
	58	* @dev: the device structure
9487eb0a TW	59	* returns -ENENT if wd client cannot be found
9487eb0a TW	60	* -EIO if write has failed
3ceb3e66	61	*/
9487eb0a	62	int mei_wd_host_init(struct mei_device *dev)
3ceb3e66	63	{
c95efb74	64	mei_cl_init(&dev->wd_cl, dev);
3ceb3e66 OW	65
	66	/* look for WD client and connect to it */
	67	dev->wd_cl.state = MEI_FILE_DISCONNECTED;
2ad64ba8	68	dev->wd_timeout = AMT_WD_DEFAULT_TIMEOUT;
3ceb3e66	69
2ad64ba8 OW	70	/* find ME WD client */
	71	mei_find_me_client_update_filext(dev, &dev->wd_cl,
	72	&mei_wd_guid, MEI_WD_HOST_CLIENT_ID);
3ceb3e66	73
9487eb0a TW	74	dev_dbg(&dev->pdev->dev, "wd: check client\n");
	75	if (MEI_FILE_CONNECTING != dev->wd_cl.state) {
	76	dev_info(&dev->pdev->dev, "wd: failed to find the client\n");
	77	return -ENOENT;
	78	}
	79
	80	if (mei_connect(dev, &dev->wd_cl)) {
	81	dev_err(&dev->pdev->dev, "wd: failed to connect to the client\n");
	82	dev->wd_cl.state = MEI_FILE_DISCONNECTED;
	83	dev->wd_cl.host_client_id = 0;
	84	return -EIO;
3ceb3e66	85	}
9487eb0a	86	dev->wd_cl.timer_count = CONNECT_TIMEOUT;
617aa396	87
9487eb0a	88	return 0;
3ceb3e66 OW	89	}
	90
	91	/**
	92	* mei_wd_send - sends watch dog message to fw.
	93	*
	94	* @dev: the device structure
	95	*
	96	* returns 0 if success,
	97	* -EIO when message send fails
	98	* -EINVAL when invalid message is to be sent
	99	*/
	100	int mei_wd_send(struct mei_device *dev)
	101	{
	102	struct mei_msg_hdr *mei_hdr;
	103
	104	mei_hdr = (struct mei_msg_hdr *) &dev->wr_msg_buf[0];
	105	mei_hdr->host_addr = dev->wd_cl.host_client_id;
	106	mei_hdr->me_addr = dev->wd_cl.me_client_id;
	107	mei_hdr->msg_complete = 1;
	108	mei_hdr->reserved = 0;
	109
	110	if (!memcmp(dev->wd_data, mei_start_wd_params, MEI_WD_PARAMS_SIZE))
	111	mei_hdr->length = MEI_START_WD_DATA_SIZE;
	112	else if (!memcmp(dev->wd_data, mei_stop_wd_params, MEI_WD_PARAMS_SIZE))
	113	mei_hdr->length = MEI_WD_PARAMS_SIZE;
	114	else
	115	return -EINVAL;
	116
1ccb7b62	117	return mei_write_message(dev, mei_hdr, dev->wd_data, mei_hdr->length);
3ceb3e66 OW	118	}
3ceb3e66 OW	119
d8deca31 OW	120	/**
	121	* mei_wd_stop - sends watchdog stop message to fw.
	122	*
	123	* @dev: the device structure
	124	* @preserve: indicate if to keep the timeout value
	125	*
	126	* returns 0 if success,
	127	* -EIO when message send fails
	128	* -EINVAL when invalid message is to be sent
	129	*/
3ceb3e66 OW	130	int mei_wd_stop(struct mei_device *dev, bool preserve)
	131	{
	132	int ret;
	133	u16 wd_timeout = dev->wd_timeout;
	134
a61c6530	135	cancel_delayed_work(&dev->timer_work);
3ceb3e66 OW	136	if (dev->wd_cl.state != MEI_FILE_CONNECTED \|\| !dev->wd_timeout)
	137	return 0;
	138
	139	dev->wd_timeout = 0;
	140	dev->wd_due_counter = 0;
	141	memcpy(dev->wd_data, mei_stop_wd_params, MEI_WD_PARAMS_SIZE);
eb9af0ac	142	dev->stop = true;
3ceb3e66 OW	143
	144	ret = mei_flow_ctrl_creds(dev, &dev->wd_cl);
	145	if (ret < 0)
	146	goto out;
	147
	148	if (ret && dev->mei_host_buffer_is_empty) {
	149	ret = 0;
eb9af0ac	150	dev->mei_host_buffer_is_empty = false;
3ceb3e66 OW	151
	152	if (!mei_wd_send(dev)) {
	153	ret = mei_flow_ctrl_reduce(dev, &dev->wd_cl);
	154	if (ret)
	155	goto out;
	156	} else {
13c398aa	157	dev_err(&dev->pdev->dev, "wd: send stop failed\n");
3ceb3e66 OW	158	}
3ceb3e66 OW	159
eb9af0ac	160	dev->wd_pending = false;
3ceb3e66	161	} else {
eb9af0ac	162	dev->wd_pending = true;
3ceb3e66	163	}
eb9af0ac	164	dev->wd_stopped = false;
3ceb3e66 OW	165	mutex_unlock(&dev->device_lock);
	166
	167	ret = wait_event_interruptible_timeout(dev->wait_stop_wd,
	168	dev->wd_stopped, 10 * HZ);
	169	mutex_lock(&dev->device_lock);
a534bb6e	170	if (dev->wd_stopped) {
13c398aa	171	dev_dbg(&dev->pdev->dev, "wd: stop completed ret=%d.\n", ret);
a534bb6e TW	172	ret = 0;
	173	} else {
	174	if (!ret)
	175	ret = -ETIMEDOUT;
	176	dev_warn(&dev->pdev->dev,
13c398aa	177	"wd: stop failed to complete ret=%d.\n", ret);
a534bb6e	178	}
3ceb3e66 OW	179
	180	if (preserve)
	181	dev->wd_timeout = wd_timeout;
	182
	183	out:
	184	return ret;
	185	}
	186
4a3cafd5 OW	187	/*
	188	* mei_wd_ops_start - wd start command from the watchdog core.
	189	*
	190	* @wd_dev - watchdog device struct
	191	*
	192	* returns 0 if success, negative errno code for failure
	193	*/
	194	static int mei_wd_ops_start(struct watchdog_device *wd_dev)
	195	{
	196	int err = -ENODEV;
	197	struct mei_device *dev;
	198
	199	dev = pci_get_drvdata(mei_device);
	200	if (!dev)
	201	return -ENODEV;
	202
	203	mutex_lock(&dev->device_lock);
	204
	205	if (dev->mei_state != MEI_ENABLED) {
13c398aa TW	206	dev_dbg(&dev->pdev->dev,
	207	"wd: mei_state != MEI_ENABLED mei_state = %d\n",
	208	dev->mei_state);
4a3cafd5 OW	209	goto end_unlock;
	210	}
	211
	212	if (dev->wd_cl.state != MEI_FILE_CONNECTED) {
13c398aa TW	213	dev_dbg(&dev->pdev->dev,
13c398aa TW	214	"MEI Driver is not connected to Watchdog Client\n");
4a3cafd5 OW	215	goto end_unlock;
	216	}
	217
55d33856	218	mei_wd_set_start_timeout(dev, dev->wd_timeout);
4a3cafd5 OW	219
	220	err = 0;
	221	end_unlock:
	222	mutex_unlock(&dev->device_lock);
	223	return err;
	224	}
	225
	226	/*
	227	* mei_wd_ops_stop - wd stop command from the watchdog core.
	228	*
	229	* @wd_dev - watchdog device struct
	230	*
	231	* returns 0 if success, negative errno code for failure
	232	*/
	233	static int mei_wd_ops_stop(struct watchdog_device *wd_dev)
	234	{
	235	struct mei_device *dev;
	236	dev = pci_get_drvdata(mei_device);
	237
	238	if (!dev)
	239	return -ENODEV;
	240
	241	mutex_lock(&dev->device_lock);
	242	mei_wd_stop(dev, false);
	243	mutex_unlock(&dev->device_lock);
	244
	245	return 0;
	246	}
	247
8c4a59a7 OW	248	/*
	249	* mei_wd_ops_ping - wd ping command from the watchdog core.
	250	*
	251	* @wd_dev - watchdog device struct
	252	*
	253	* returns 0 if success, negative errno code for failure
	254	*/
	255	static int mei_wd_ops_ping(struct watchdog_device *wd_dev)
	256	{
	257	int ret = 0;
	258	struct mei_device *dev;
	259	dev = pci_get_drvdata(mei_device);
	260
	261	if (!dev)
	262	return -ENODEV;
	263
	264	mutex_lock(&dev->device_lock);
	265
	266	if (dev->wd_cl.state != MEI_FILE_CONNECTED) {
13c398aa	267	dev_err(&dev->pdev->dev, "wd: not connected.\n");
8c4a59a7 OW	268	ret = -ENODEV;
	269	goto end;
	270	}
	271
	272	/* Check if we can send the ping to HW*/
	273	if (dev->mei_host_buffer_is_empty &&
	274	mei_flow_ctrl_creds(dev, &dev->wd_cl) > 0) {
	275
	276	dev->mei_host_buffer_is_empty = false;
13c398aa	277	dev_dbg(&dev->pdev->dev, "wd: sending ping\n");
8c4a59a7 OW	278
8c4a59a7 OW	279	if (mei_wd_send(dev)) {
13c398aa	280	dev_err(&dev->pdev->dev, "wd: send failed.\n");
8c4a59a7 OW	281	ret = -EIO;
	282	goto end;
	283	}
	284
	285	if (mei_flow_ctrl_reduce(dev, &dev->wd_cl)) {
13c398aa TW	286	dev_err(&dev->pdev->dev,
13c398aa TW	287	"wd: mei_flow_ctrl_reduce() failed.\n");
8c4a59a7 OW	288	ret = -EIO;
	289	goto end;
	290	}
	291
	292	} else {
	293	dev->wd_pending = true;
	294	}
	295
	296	end:
	297	mutex_unlock(&dev->device_lock);
	298	return ret;
	299	}
	300
55d33856 OW	301	/*
	302	* mei_wd_ops_set_timeout - wd set timeout command from the watchdog core.
	303	*
	304	* @wd_dev - watchdog device struct
	305	* @timeout - timeout value to set
	306	*
	307	* returns 0 if success, negative errno code for failure
	308	*/
	309	static int mei_wd_ops_set_timeout(struct watchdog_device *wd_dev, unsigned int timeout)
	310	{
	311	struct mei_device *dev;
	312	dev = pci_get_drvdata(mei_device);
	313
	314	if (!dev)
	315	return -ENODEV;
	316
	317	/* Check Timeout value */
	318	if (timeout < AMT_WD_MIN_TIMEOUT \|\| timeout > AMT_WD_MAX_TIMEOUT)
	319	return -EINVAL;
	320
	321	mutex_lock(&dev->device_lock);
	322
	323	dev->wd_timeout = timeout;
0197c1c4	324	wd_dev->timeout = timeout;
55d33856 OW	325	mei_wd_set_start_timeout(dev, dev->wd_timeout);
	326
	327	mutex_unlock(&dev->device_lock);
	328
	329	return 0;
	330	}
	331
4a3cafd5 OW	332	/*
	333	* Watchdog Device structs
	334	*/
575c1e43	335	static const struct watchdog_ops wd_ops = {
4a3cafd5 OW	336	.owner = THIS_MODULE,
	337	.start = mei_wd_ops_start,
	338	.stop = mei_wd_ops_stop,
8c4a59a7	339	.ping = mei_wd_ops_ping,
55d33856	340	.set_timeout = mei_wd_ops_set_timeout,
4a3cafd5	341	};
575c1e43	342	static const struct watchdog_info wd_info = {
4a3cafd5	343	.identity = INTEL_AMT_WATCHDOG_ID,
49fbd3f1	344	.options = WDIOF_KEEPALIVEPING \| WDIOF_ALARMONLY,
4a3cafd5 OW	345	};
4a3cafd5 OW	346
68d923d5	347	static struct watchdog_device amt_wd_dev = {
4a3cafd5 OW	348	.info = &wd_info,
	349	.ops = &wd_ops,
	350	.timeout = AMT_WD_DEFAULT_TIMEOUT,
	351	.min_timeout = AMT_WD_MIN_TIMEOUT,
	352	.max_timeout = AMT_WD_MAX_TIMEOUT,
	353	};
	354
	355
70cd5337 TW	356	void mei_watchdog_register(struct mei_device *dev)
	357	{
	358	dev_dbg(&dev->pdev->dev, "dev->wd_timeout =%d.\n", dev->wd_timeout);
	359
	360	dev->wd_due_counter = !!dev->wd_timeout;
	361
	362	if (watchdog_register_device(&amt_wd_dev)) {
13c398aa TW	363	dev_err(&dev->pdev->dev,
13c398aa TW	364	"wd: unable to register watchdog device.\n");
70cd5337 TW	365	dev->wd_interface_reg = false;
70cd5337 TW	366	} else {
13c398aa TW	367	dev_dbg(&dev->pdev->dev,
13c398aa TW	368	"wd: successfully register watchdog interface.\n");
70cd5337 TW	369	dev->wd_interface_reg = true;
	370	}
	371	}
	372
	373	void mei_watchdog_unregister(struct mei_device *dev)
	374	{
	375	if (dev->wd_interface_reg)
	376	watchdog_unregister_device(&amt_wd_dev);
	377	dev->wd_interface_reg = false;
	378	}
	379