[mirror_ubuntu-eoan-kernel.git] / drivers / staging / 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 "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);

void mei_wd_set_start_timeout(struct mei_device *dev, u16 timeout)
{
	dev_dbg(&dev->pdev->dev, "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
 */
bool mei_wd_host_init(struct mei_device *dev)
{
	bool ret = false;

	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, "check wd_cl\n");
	if (MEI_FILE_CONNECTING == dev->wd_cl.state) {
		if (!mei_connect(dev, &dev->wd_cl)) {
			dev_dbg(&dev->pdev->dev, "Failed to connect to WD client\n");
			dev->wd_cl.state = MEI_FILE_DISCONNECTED;
			dev->wd_cl.host_client_id = 0;
			ret = false;
			goto end;
		} else {
			dev->wd_cl.timer_count = CONNECT_TIMEOUT;
		}
	} else {
		dev_dbg(&dev->pdev->dev, "Failed to find WD client\n");
		ret = false;
		goto end;
	}

end:
	return ret;
}

/**
 * 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;

	if (mei_write_message(dev, mei_hdr, dev->wd_data, mei_hdr->length))
		return 0;
	return -EIO;
}

/**
 * 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_dbg(&dev->pdev->dev, "send stop WD 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, "stop wd complete ret=%d.\n", ret);
		ret = 0;
	} else {
		if (!ret)
			ret = -ETIMEDOUT;
		dev_warn(&dev->pdev->dev,
			"stop wd 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, "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_dbg(&dev->pdev->dev, "wd is 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, "sending watchdog ping\n");

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

		if (mei_flow_ctrl_reduce(dev, &dev->wd_cl)) {
			dev_dbg(&dev->pdev->dev, "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;
	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,
};

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, "unable to register watchdog device.\n");
		dev->wd_interface_reg = false;
	} else {
		dev_dbg(&dev->pdev->dev, "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"
	27	#include "mei.h"
	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
55d33856	48	void mei_wd_set_start_timeout(struct mei_device *dev, u16 timeout)
3ceb3e66	49	{
55d33856	50	dev_dbg(&dev->pdev->dev, "timeout=%d.\n", timeout);
3ceb3e66 OW	51	memcpy(dev->wd_data, mei_start_wd_params, MEI_WD_PARAMS_SIZE);
3ceb3e66 OW	52	memcpy(dev->wd_data + MEI_WD_PARAMS_SIZE,
55d33856	53	&timeout, sizeof(u16));
3ceb3e66 OW	54	}
	55
	56	/**
	57	* host_init_wd - mei initialization wd.
	58	*
	59	* @dev: the device structure
	60	*/
617aa396	61	bool mei_wd_host_init(struct mei_device *dev)
3ceb3e66	62	{
617aa396 OW	63	bool ret = false;
617aa396 OW	64
c95efb74	65	mei_cl_init(&dev->wd_cl, dev);
3ceb3e66 OW	66
	67	/* look for WD client and connect to it */
	68	dev->wd_cl.state = MEI_FILE_DISCONNECTED;
2ad64ba8	69	dev->wd_timeout = AMT_WD_DEFAULT_TIMEOUT;
3ceb3e66	70
2ad64ba8 OW	71	/* find ME WD client */
	72	mei_find_me_client_update_filext(dev, &dev->wd_cl,
	73	&mei_wd_guid, MEI_WD_HOST_CLIENT_ID);
3ceb3e66	74
2ad64ba8 OW	75	dev_dbg(&dev->pdev->dev, "check wd_cl\n");
	76	if (MEI_FILE_CONNECTING == dev->wd_cl.state) {
	77	if (!mei_connect(dev, &dev->wd_cl)) {
	78	dev_dbg(&dev->pdev->dev, "Failed to connect to WD client\n");
	79	dev->wd_cl.state = MEI_FILE_DISCONNECTED;
	80	dev->wd_cl.host_client_id = 0;
617aa396 OW	81	ret = false;
617aa396 OW	82	goto end;
2ad64ba8 OW	83	} else {
2ad64ba8 OW	84	dev->wd_cl.timer_count = CONNECT_TIMEOUT;
3ceb3e66 OW	85	}
3ceb3e66 OW	86	} else {
2ad64ba8	87	dev_dbg(&dev->pdev->dev, "Failed to find WD client\n");
617aa396 OW	88	ret = false;
617aa396 OW	89	goto end;
3ceb3e66	90	}
617aa396 OW	91
	92	end:
	93	return ret;
3ceb3e66 OW	94	}
	95
	96	/**
	97	* mei_wd_send - sends watch dog message to fw.
	98	*
	99	* @dev: the device structure
	100	*
	101	* returns 0 if success,
	102	* -EIO when message send fails
	103	* -EINVAL when invalid message is to be sent
	104	*/
	105	int mei_wd_send(struct mei_device *dev)
	106	{
	107	struct mei_msg_hdr *mei_hdr;
	108
	109	mei_hdr = (struct mei_msg_hdr *) &dev->wr_msg_buf[0];
	110	mei_hdr->host_addr = dev->wd_cl.host_client_id;
	111	mei_hdr->me_addr = dev->wd_cl.me_client_id;
	112	mei_hdr->msg_complete = 1;
	113	mei_hdr->reserved = 0;
	114
	115	if (!memcmp(dev->wd_data, mei_start_wd_params, MEI_WD_PARAMS_SIZE))
	116	mei_hdr->length = MEI_START_WD_DATA_SIZE;
	117	else if (!memcmp(dev->wd_data, mei_stop_wd_params, MEI_WD_PARAMS_SIZE))
	118	mei_hdr->length = MEI_WD_PARAMS_SIZE;
	119	else
	120	return -EINVAL;
	121
	122	if (mei_write_message(dev, mei_hdr, dev->wd_data, mei_hdr->length))
	123	return 0;
	124	return -EIO;
	125	}
	126
d8deca31 OW	127	/**
	128	* mei_wd_stop - sends watchdog stop message to fw.
	129	*
	130	* @dev: the device structure
	131	* @preserve: indicate if to keep the timeout value
	132	*
	133	* returns 0 if success,
	134	* -EIO when message send fails
	135	* -EINVAL when invalid message is to be sent
	136	*/
3ceb3e66 OW	137	int mei_wd_stop(struct mei_device *dev, bool preserve)
	138	{
	139	int ret;
	140	u16 wd_timeout = dev->wd_timeout;
	141
a61c6530	142	cancel_delayed_work(&dev->timer_work);
3ceb3e66 OW	143	if (dev->wd_cl.state != MEI_FILE_CONNECTED \|\| !dev->wd_timeout)
	144	return 0;
	145
	146	dev->wd_timeout = 0;
	147	dev->wd_due_counter = 0;
	148	memcpy(dev->wd_data, mei_stop_wd_params, MEI_WD_PARAMS_SIZE);
eb9af0ac	149	dev->stop = true;
3ceb3e66 OW	150
	151	ret = mei_flow_ctrl_creds(dev, &dev->wd_cl);
	152	if (ret < 0)
	153	goto out;
	154
	155	if (ret && dev->mei_host_buffer_is_empty) {
	156	ret = 0;
eb9af0ac	157	dev->mei_host_buffer_is_empty = false;
3ceb3e66 OW	158
	159	if (!mei_wd_send(dev)) {
	160	ret = mei_flow_ctrl_reduce(dev, &dev->wd_cl);
	161	if (ret)
	162	goto out;
	163	} else {
	164	dev_dbg(&dev->pdev->dev, "send stop WD failed\n");
	165	}
	166
eb9af0ac	167	dev->wd_pending = false;
3ceb3e66	168	} else {
eb9af0ac	169	dev->wd_pending = true;
3ceb3e66	170	}
eb9af0ac	171	dev->wd_stopped = false;
3ceb3e66 OW	172	mutex_unlock(&dev->device_lock);
	173
	174	ret = wait_event_interruptible_timeout(dev->wait_stop_wd,
	175	dev->wd_stopped, 10 * HZ);
	176	mutex_lock(&dev->device_lock);
a534bb6e TW	177	if (dev->wd_stopped) {
	178	dev_dbg(&dev->pdev->dev, "stop wd complete ret=%d.\n", ret);
	179	ret = 0;
	180	} else {
	181	if (!ret)
	182	ret = -ETIMEDOUT;
	183	dev_warn(&dev->pdev->dev,
	184	"stop wd failed to complete ret=%d.\n", ret);
	185	}
3ceb3e66 OW	186
	187	if (preserve)
	188	dev->wd_timeout = wd_timeout;
	189
	190	out:
	191	return ret;
	192	}
	193
4a3cafd5 OW	194	/*
	195	* mei_wd_ops_start - wd start command from the watchdog core.
	196	*
	197	* @wd_dev - watchdog device struct
	198	*
	199	* returns 0 if success, negative errno code for failure
	200	*/
	201	static int mei_wd_ops_start(struct watchdog_device *wd_dev)
	202	{
	203	int err = -ENODEV;
	204	struct mei_device *dev;
	205
	206	dev = pci_get_drvdata(mei_device);
	207	if (!dev)
	208	return -ENODEV;
	209
	210	mutex_lock(&dev->device_lock);
	211
	212	if (dev->mei_state != MEI_ENABLED) {
	213	dev_dbg(&dev->pdev->dev, "mei_state != MEI_ENABLED mei_state= %d\n",
	214	dev->mei_state);
	215	goto end_unlock;
	216	}
	217
	218	if (dev->wd_cl.state != MEI_FILE_CONNECTED) {
	219	dev_dbg(&dev->pdev->dev, "MEI Driver is not connected to Watchdog Client\n");
	220	goto end_unlock;
	221	}
	222
55d33856	223	mei_wd_set_start_timeout(dev, dev->wd_timeout);
4a3cafd5 OW	224
	225	err = 0;
	226	end_unlock:
	227	mutex_unlock(&dev->device_lock);
	228	return err;
	229	}
	230
	231	/*
	232	* mei_wd_ops_stop - wd stop command from the watchdog core.
	233	*
	234	* @wd_dev - watchdog device struct
	235	*
	236	* returns 0 if success, negative errno code for failure
	237	*/
	238	static int mei_wd_ops_stop(struct watchdog_device *wd_dev)
	239	{
	240	struct mei_device *dev;
	241	dev = pci_get_drvdata(mei_device);
	242
	243	if (!dev)
	244	return -ENODEV;
	245
	246	mutex_lock(&dev->device_lock);
	247	mei_wd_stop(dev, false);
	248	mutex_unlock(&dev->device_lock);
	249
	250	return 0;
	251	}
	252
8c4a59a7 OW	253	/*
	254	* mei_wd_ops_ping - wd ping command from the watchdog core.
	255	*
	256	* @wd_dev - watchdog device struct
	257	*
	258	* returns 0 if success, negative errno code for failure
	259	*/
	260	static int mei_wd_ops_ping(struct watchdog_device *wd_dev)
	261	{
	262	int ret = 0;
	263	struct mei_device *dev;
	264	dev = pci_get_drvdata(mei_device);
	265
	266	if (!dev)
	267	return -ENODEV;
	268
	269	mutex_lock(&dev->device_lock);
	270
	271	if (dev->wd_cl.state != MEI_FILE_CONNECTED) {
	272	dev_dbg(&dev->pdev->dev, "wd is not connected.\n");
	273	ret = -ENODEV;
	274	goto end;
	275	}
	276
	277	/* Check if we can send the ping to HW*/
	278	if (dev->mei_host_buffer_is_empty &&
	279	mei_flow_ctrl_creds(dev, &dev->wd_cl) > 0) {
	280
	281	dev->mei_host_buffer_is_empty = false;
	282	dev_dbg(&dev->pdev->dev, "sending watchdog ping\n");
	283
	284	if (mei_wd_send(dev)) {
	285	dev_dbg(&dev->pdev->dev, "wd send failed.\n");
	286	ret = -EIO;
	287	goto end;
	288	}
	289
	290	if (mei_flow_ctrl_reduce(dev, &dev->wd_cl)) {
	291	dev_dbg(&dev->pdev->dev, "mei_flow_ctrl_reduce() failed.\n");
	292	ret = -EIO;
	293	goto end;
	294	}
	295
	296	} else {
	297	dev->wd_pending = true;
	298	}
	299
	300	end:
	301	mutex_unlock(&dev->device_lock);
	302	return ret;
	303	}
	304
55d33856 OW	305	/*
	306	* mei_wd_ops_set_timeout - wd set timeout command from the watchdog core.
	307	*
	308	* @wd_dev - watchdog device struct
	309	* @timeout - timeout value to set
	310	*
	311	* returns 0 if success, negative errno code for failure
	312	*/
	313	static int mei_wd_ops_set_timeout(struct watchdog_device *wd_dev, unsigned int timeout)
	314	{
	315	struct mei_device *dev;
	316	dev = pci_get_drvdata(mei_device);
	317
	318	if (!dev)
	319	return -ENODEV;
	320
	321	/* Check Timeout value */
	322	if (timeout < AMT_WD_MIN_TIMEOUT \|\| timeout > AMT_WD_MAX_TIMEOUT)
	323	return -EINVAL;
	324
	325	mutex_lock(&dev->device_lock);
	326
	327	dev->wd_timeout = timeout;
	328	mei_wd_set_start_timeout(dev, dev->wd_timeout);
	329
	330	mutex_unlock(&dev->device_lock);
	331
	332	return 0;
	333	}
	334
4a3cafd5 OW	335	/*
	336	* Watchdog Device structs
	337	*/
575c1e43	338	static const struct watchdog_ops wd_ops = {
4a3cafd5 OW	339	.owner = THIS_MODULE,
	340	.start = mei_wd_ops_start,
	341	.stop = mei_wd_ops_stop,
8c4a59a7	342	.ping = mei_wd_ops_ping,
55d33856	343	.set_timeout = mei_wd_ops_set_timeout,
4a3cafd5	344	};
575c1e43	345	static const struct watchdog_info wd_info = {
4a3cafd5	346	.identity = INTEL_AMT_WATCHDOG_ID,
8c4a59a7	347	.options = WDIOF_KEEPALIVEPING,
4a3cafd5 OW	348	};
	349
	350	struct watchdog_device amt_wd_dev = {
	351	.info = &wd_info,
	352	.ops = &wd_ops,
	353	.timeout = AMT_WD_DEFAULT_TIMEOUT,
	354	.min_timeout = AMT_WD_MIN_TIMEOUT,
	355	.max_timeout = AMT_WD_MAX_TIMEOUT,
	356	};
	357
	358
70cd5337 TW	359	void mei_watchdog_register(struct mei_device *dev)
	360	{
	361	dev_dbg(&dev->pdev->dev, "dev->wd_timeout =%d.\n", dev->wd_timeout);
	362
	363	dev->wd_due_counter = !!dev->wd_timeout;
	364
	365	if (watchdog_register_device(&amt_wd_dev)) {
	366	dev_err(&dev->pdev->dev, "unable to register watchdog device.\n");
	367	dev->wd_interface_reg = false;
	368	} else {
	369	dev_dbg(&dev->pdev->dev, "successfully register watchdog interface.\n");
	370	dev->wd_interface_reg = true;
	371	}
	372	}
	373
	374	void mei_watchdog_unregister(struct mei_device *dev)
	375	{
	376	if (dev->wd_interface_reg)
	377	watchdog_unregister_device(&amt_wd_dev);
	378	dev->wd_interface_reg = false;
	379	}
	380