[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_HDR_SIZE);
	memcpy(dev->wd_data + MEI_WD_HDR_SIZE, &timeout, sizeof(u16));
}

/**
 * mei_wd_host_init - connect to the watchdog client
 *
 * @dev: the device structure
 * returns -ENENT if wd client cannot be found
 *         -EIO if write has failed
 *         0 on success
 */
int mei_wd_host_init(struct mei_device *dev)
{
	int id;
	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 = MEI_WD_DEFAULT_TIMEOUT;
	dev->wd_state = MEI_WD_IDLE;

	/* Connect WD ME client to the host client */
	id = mei_me_cl_link(dev, &dev->wd_cl,
				&mei_wd_guid, MEI_WD_HOST_CLIENT_ID);

	if (id < 0) {
		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 = MEI_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_HDR_SIZE))
		mei_hdr->length = MEI_WD_START_MSG_SIZE;
	else if (!memcmp(dev->wd_data, mei_stop_wd_params, MEI_WD_HDR_SIZE))
		mei_hdr->length = MEI_WD_STOP_MSG_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)
{
	int ret;

	if (dev->wd_cl.state != MEI_FILE_CONNECTED ||
	    dev->wd_state != MEI_WD_RUNNING)
		return 0;

	memcpy(dev->wd_data, mei_stop_wd_params, MEI_WD_STOP_MSG_SIZE);

	dev->wd_state = MEI_WD_STOPPING;

	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;
	}

	mutex_unlock(&dev->device_lock);

	ret = wait_event_interruptible_timeout(dev->wait_stop_wd,
					dev->wd_state == MEI_WD_IDLE,
					msecs_to_jiffies(MEI_WD_STOP_TIMEOUT));
	mutex_lock(&dev->device_lock);
	if (dev->wd_state == MEI_WD_IDLE) {
		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);
	}

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 = watchdog_get_drvdata(wd_dev);
	if (!dev)
		return -ENODEV;

	mutex_lock(&dev->device_lock);

	if (dev->dev_state != MEI_DEV_ENABLED) {
		dev_dbg(&dev->pdev->dev,
			"wd: dev_state != MEI_DEV_ENABLED  dev_state = %s\n",
			mei_dev_state_str(dev->dev_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 = watchdog_get_drvdata(wd_dev);
	if (!dev)
		return -ENODEV;

	mutex_lock(&dev->device_lock);
	mei_wd_stop(dev);
	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 = watchdog_get_drvdata(wd_dev);
	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;
	}

	dev->wd_state = MEI_WD_RUNNING;

	/* 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 = watchdog_get_drvdata(wd_dev);
	if (!dev)
		return -ENODEV;

	/* Check Timeout value */
	if (timeout < MEI_WD_MIN_TIMEOUT || timeout > MEI_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_SETTIMEOUT |
			   WDIOF_ALARMONLY,
};

static struct watchdog_device amt_wd_dev = {
		.info = &wd_info,
		.ops = &wd_ops,
		.timeout = MEI_WD_DEFAULT_TIMEOUT,
		.min_timeout = MEI_WD_MIN_TIMEOUT,
		.max_timeout = MEI_WD_MAX_TIMEOUT,
};


void mei_watchdog_register(struct mei_device *dev)
{
	if (watchdog_register_device(&amt_wd_dev)) {
		dev_err(&dev->pdev->dev,
			"wd: unable to register watchdog device.\n");
		return;
	}

	dev_dbg(&dev->pdev->dev,
		"wd: successfully register watchdog interface.\n");
	watchdog_set_drvdata(&amt_wd_dev, dev);
}

void mei_watchdog_unregister(struct mei_device *dev)
{
	if (test_bit(WDOG_UNREGISTERED, &amt_wd_dev.status))
		return;

	watchdog_set_drvdata(&amt_wd_dev, NULL);
	watchdog_unregister_device(&amt_wd_dev);
}
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);
248ffdf7 TW	51	memcpy(dev->wd_data, mei_start_wd_params, MEI_WD_HDR_SIZE);
248ffdf7 TW	52	memcpy(dev->wd_data + MEI_WD_HDR_SIZE, &timeout, sizeof(u16));
3ceb3e66 OW	53	}
	54
	55	/**
7cb1ba9b	56	* mei_wd_host_init - connect to the watchdog client
3ceb3e66 OW	57	*
3ceb3e66 OW	58	* @dev: the device structure
9487eb0a TW	59	* returns -ENENT if wd client cannot be found
9487eb0a TW	60	* -EIO if write has failed
7cb1ba9b	61	* 0 on success
3ceb3e66	62	*/
9487eb0a	63	int mei_wd_host_init(struct mei_device *dev)
3ceb3e66	64	{
ff8b2f4e	65	int id;
c95efb74	66	mei_cl_init(&dev->wd_cl, dev);
3ceb3e66 OW	67
	68	/* look for WD client and connect to it */
	69	dev->wd_cl.state = MEI_FILE_DISCONNECTED;
248ffdf7	70	dev->wd_timeout = MEI_WD_DEFAULT_TIMEOUT;
c216fdeb	71	dev->wd_state = MEI_WD_IDLE;
3ceb3e66	72
ff8b2f4e TW	73	/* Connect WD ME client to the host client */
ff8b2f4e TW	74	id = mei_me_cl_link(dev, &dev->wd_cl,
2ad64ba8	75	&mei_wd_guid, MEI_WD_HOST_CLIENT_ID);
3ceb3e66	76
ff8b2f4e	77	if (id < 0) {
9487eb0a TW	78	dev_info(&dev->pdev->dev, "wd: failed to find the client\n");
	79	return -ENOENT;
	80	}
	81
	82	if (mei_connect(dev, &dev->wd_cl)) {
	83	dev_err(&dev->pdev->dev, "wd: failed to connect to the client\n");
	84	dev->wd_cl.state = MEI_FILE_DISCONNECTED;
	85	dev->wd_cl.host_client_id = 0;
	86	return -EIO;
3ceb3e66	87	}
3870c320	88	dev->wd_cl.timer_count = MEI_CONNECT_TIMEOUT;
617aa396	89
9487eb0a	90	return 0;
3ceb3e66 OW	91	}
	92
	93	/**
	94	* mei_wd_send - sends watch dog message to fw.
	95	*
	96	* @dev: the device structure
	97	*
	98	* returns 0 if success,
	99	* -EIO when message send fails
	100	* -EINVAL when invalid message is to be sent
	101	*/
	102	int mei_wd_send(struct mei_device *dev)
	103	{
	104	struct mei_msg_hdr *mei_hdr;
	105
	106	mei_hdr = (struct mei_msg_hdr *) &dev->wr_msg_buf[0];
	107	mei_hdr->host_addr = dev->wd_cl.host_client_id;
	108	mei_hdr->me_addr = dev->wd_cl.me_client_id;
	109	mei_hdr->msg_complete = 1;
	110	mei_hdr->reserved = 0;
	111
248ffdf7 TW	112	if (!memcmp(dev->wd_data, mei_start_wd_params, MEI_WD_HDR_SIZE))
	113	mei_hdr->length = MEI_WD_START_MSG_SIZE;
	114	else if (!memcmp(dev->wd_data, mei_stop_wd_params, MEI_WD_HDR_SIZE))
	115	mei_hdr->length = MEI_WD_STOP_MSG_SIZE;
3ceb3e66 OW	116	else
	117	return -EINVAL;
	118
1ccb7b62	119	return mei_write_message(dev, mei_hdr, dev->wd_data, mei_hdr->length);
3ceb3e66 OW	120	}
3ceb3e66 OW	121
d8deca31 OW	122	/**
	123	* mei_wd_stop - sends watchdog stop message to fw.
	124	*
	125	* @dev: the device structure
	126	* @preserve: indicate if to keep the timeout value
	127	*
	128	* returns 0 if success,
	129	* -EIO when message send fails
	130	* -EINVAL when invalid message is to be sent
	131	*/
c216fdeb	132	int mei_wd_stop(struct mei_device *dev)
3ceb3e66 OW	133	{
3ceb3e66 OW	134	int ret;
3ceb3e66	135
c216fdeb TW	136	if (dev->wd_cl.state != MEI_FILE_CONNECTED \|\|
c216fdeb TW	137	dev->wd_state != MEI_WD_RUNNING)
3ceb3e66 OW	138	return 0;
3ceb3e66 OW	139
248ffdf7	140	memcpy(dev->wd_data, mei_stop_wd_params, MEI_WD_STOP_MSG_SIZE);
c216fdeb TW	141
c216fdeb TW	142	dev->wd_state = MEI_WD_STOPPING;
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	}
c216fdeb	164
3ceb3e66 OW	165	mutex_unlock(&dev->device_lock);
	166
	167	ret = wait_event_interruptible_timeout(dev->wait_stop_wd,
c216fdeb TW	168	dev->wd_state == MEI_WD_IDLE,
c216fdeb TW	169	msecs_to_jiffies(MEI_WD_STOP_TIMEOUT));
3ceb3e66	170	mutex_lock(&dev->device_lock);
c216fdeb	171	if (dev->wd_state == MEI_WD_IDLE) {
13c398aa	172	dev_dbg(&dev->pdev->dev, "wd: stop completed ret=%d.\n", ret);
a534bb6e TW	173	ret = 0;
	174	} else {
	175	if (!ret)
	176	ret = -ETIMEDOUT;
	177	dev_warn(&dev->pdev->dev,
13c398aa	178	"wd: stop failed to complete ret=%d.\n", ret);
a534bb6e	179	}
3ceb3e66	180
3ceb3e66 OW	181	out:
	182	return ret;
	183	}
	184
4a3cafd5 OW	185	/*
	186	* mei_wd_ops_start - wd start command from the watchdog core.
	187	*
	188	* @wd_dev - watchdog device struct
	189	*
	190	* returns 0 if success, negative errno code for failure
	191	*/
	192	static int mei_wd_ops_start(struct watchdog_device *wd_dev)
	193	{
	194	int err = -ENODEV;
	195	struct mei_device *dev;
	196
09649a85	197	dev = watchdog_get_drvdata(wd_dev);
4a3cafd5 OW	198	if (!dev)
	199	return -ENODEV;
	200
	201	mutex_lock(&dev->device_lock);
	202
b210d750	203	if (dev->dev_state != MEI_DEV_ENABLED) {
13c398aa	204	dev_dbg(&dev->pdev->dev,
b210d750 TW	205	"wd: dev_state != MEI_DEV_ENABLED dev_state = %s\n",
b210d750 TW	206	mei_dev_state_str(dev->dev_state));
4a3cafd5 OW	207	goto end_unlock;
	208	}
	209
	210	if (dev->wd_cl.state != MEI_FILE_CONNECTED) {
13c398aa TW	211	dev_dbg(&dev->pdev->dev,
13c398aa TW	212	"MEI Driver is not connected to Watchdog Client\n");
4a3cafd5 OW	213	goto end_unlock;
	214	}
	215
55d33856	216	mei_wd_set_start_timeout(dev, dev->wd_timeout);
4a3cafd5 OW	217
	218	err = 0;
	219	end_unlock:
	220	mutex_unlock(&dev->device_lock);
	221	return err;
	222	}
	223
	224	/*
	225	* mei_wd_ops_stop - wd stop command from the watchdog core.
	226	*
	227	* @wd_dev - watchdog device struct
	228	*
	229	* returns 0 if success, negative errno code for failure
	230	*/
	231	static int mei_wd_ops_stop(struct watchdog_device *wd_dev)
	232	{
	233	struct mei_device *dev;
4a3cafd5	234
09649a85	235	dev = watchdog_get_drvdata(wd_dev);
4a3cafd5 OW	236	if (!dev)
	237	return -ENODEV;
	238
	239	mutex_lock(&dev->device_lock);
c216fdeb	240	mei_wd_stop(dev);
4a3cafd5 OW	241	mutex_unlock(&dev->device_lock);
	242
	243	return 0;
	244	}
	245
8c4a59a7 OW	246	/*
	247	* mei_wd_ops_ping - wd ping command from the watchdog core.
	248	*
	249	* @wd_dev - watchdog device struct
	250	*
	251	* returns 0 if success, negative errno code for failure
	252	*/
	253	static int mei_wd_ops_ping(struct watchdog_device *wd_dev)
	254	{
	255	int ret = 0;
	256	struct mei_device *dev;
8c4a59a7	257
09649a85	258	dev = watchdog_get_drvdata(wd_dev);
8c4a59a7 OW	259	if (!dev)
	260	return -ENODEV;
	261
	262	mutex_lock(&dev->device_lock);
	263
	264	if (dev->wd_cl.state != MEI_FILE_CONNECTED) {
13c398aa	265	dev_err(&dev->pdev->dev, "wd: not connected.\n");
8c4a59a7 OW	266	ret = -ENODEV;
	267	goto end;
	268	}
	269
c216fdeb TW	270	dev->wd_state = MEI_WD_RUNNING;
c216fdeb TW	271
8c4a59a7 OW	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;
55d33856	312
09649a85	313	dev = watchdog_get_drvdata(wd_dev);
55d33856 OW	314	if (!dev)
	315	return -ENODEV;
	316
	317	/* Check Timeout value */
248ffdf7	318	if (timeout < MEI_WD_MIN_TIMEOUT \|\| timeout > MEI_WD_MAX_TIMEOUT)
55d33856 OW	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,
c8df7292 TW	344	.options = WDIOF_KEEPALIVEPING \|
	345	WDIOF_SETTIMEOUT \|
	346	WDIOF_ALARMONLY,
4a3cafd5 OW	347	};
4a3cafd5 OW	348
68d923d5	349	static struct watchdog_device amt_wd_dev = {
4a3cafd5 OW	350	.info = &wd_info,
4a3cafd5 OW	351	.ops = &wd_ops,
248ffdf7 TW	352	.timeout = MEI_WD_DEFAULT_TIMEOUT,
	353	.min_timeout = MEI_WD_MIN_TIMEOUT,
	354	.max_timeout = MEI_WD_MAX_TIMEOUT,
4a3cafd5 OW	355	};
	356
	357
09649a85	358	void mei_watchdog_register(struct mei_device *dev)
70cd5337	359	{
70cd5337	360	if (watchdog_register_device(&amt_wd_dev)) {
13c398aa TW	361	dev_err(&dev->pdev->dev,
13c398aa TW	362	"wd: unable to register watchdog device.\n");
09649a85	363	return;
70cd5337	364	}
09649a85 TW	365
	366	dev_dbg(&dev->pdev->dev,
	367	"wd: successfully register watchdog interface.\n");
09649a85	368	watchdog_set_drvdata(&amt_wd_dev, dev);
70cd5337 TW	369	}
	370
	371	void mei_watchdog_unregister(struct mei_device *dev)
	372	{
c7d3df35	373	if (test_bit(WDOG_UNREGISTERED, &amt_wd_dev.status))
09649a85 TW	374	return;
	375
	376	watchdog_set_drvdata(&amt_wd_dev, NULL);
	377	watchdog_unregister_device(&amt_wd_dev);
70cd5337 TW	378	}
70cd5337 TW	379