[mirror_ubuntu-artful-kernel.git] / drivers / misc / mei / pci-me.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.
 *
 */

#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt

#include <linux/module.h>
#include <linux/moduleparam.h>
#include <linux/kernel.h>
#include <linux/device.h>
#include <linux/fs.h>
#include <linux/errno.h>
#include <linux/types.h>
#include <linux/fcntl.h>
#include <linux/aio.h>
#include <linux/pci.h>
#include <linux/poll.h>
#include <linux/init.h>
#include <linux/ioctl.h>
#include <linux/cdev.h>
#include <linux/sched.h>
#include <linux/uuid.h>
#include <linux/compat.h>
#include <linux/jiffies.h>
#include <linux/interrupt.h>
#include <linux/miscdevice.h>

#include <linux/mei.h>

#include "mei_dev.h"
#include "hw-me.h"
#include "client.h"

/* AMT device is a singleton on the platform */
static struct pci_dev *mei_pdev;

/* mei_pci_tbl - PCI Device ID Table */
static DEFINE_PCI_DEVICE_TABLE(mei_pci_tbl) = {
	{PCI_DEVICE(PCI_VENDOR_ID_INTEL, MEI_DEV_ID_82946GZ)},
	{PCI_DEVICE(PCI_VENDOR_ID_INTEL, MEI_DEV_ID_82G35)},
	{PCI_DEVICE(PCI_VENDOR_ID_INTEL, MEI_DEV_ID_82Q965)},
	{PCI_DEVICE(PCI_VENDOR_ID_INTEL, MEI_DEV_ID_82G965)},
	{PCI_DEVICE(PCI_VENDOR_ID_INTEL, MEI_DEV_ID_82GM965)},
	{PCI_DEVICE(PCI_VENDOR_ID_INTEL, MEI_DEV_ID_82GME965)},
	{PCI_DEVICE(PCI_VENDOR_ID_INTEL, MEI_DEV_ID_ICH9_82Q35)},
	{PCI_DEVICE(PCI_VENDOR_ID_INTEL, MEI_DEV_ID_ICH9_82G33)},
	{PCI_DEVICE(PCI_VENDOR_ID_INTEL, MEI_DEV_ID_ICH9_82Q33)},
	{PCI_DEVICE(PCI_VENDOR_ID_INTEL, MEI_DEV_ID_ICH9_82X38)},
	{PCI_DEVICE(PCI_VENDOR_ID_INTEL, MEI_DEV_ID_ICH9_3200)},
	{PCI_DEVICE(PCI_VENDOR_ID_INTEL, MEI_DEV_ID_ICH9_6)},
	{PCI_DEVICE(PCI_VENDOR_ID_INTEL, MEI_DEV_ID_ICH9_7)},
	{PCI_DEVICE(PCI_VENDOR_ID_INTEL, MEI_DEV_ID_ICH9_8)},
	{PCI_DEVICE(PCI_VENDOR_ID_INTEL, MEI_DEV_ID_ICH9_9)},
	{PCI_DEVICE(PCI_VENDOR_ID_INTEL, MEI_DEV_ID_ICH9_10)},
	{PCI_DEVICE(PCI_VENDOR_ID_INTEL, MEI_DEV_ID_ICH9M_1)},
	{PCI_DEVICE(PCI_VENDOR_ID_INTEL, MEI_DEV_ID_ICH9M_2)},
	{PCI_DEVICE(PCI_VENDOR_ID_INTEL, MEI_DEV_ID_ICH9M_3)},
	{PCI_DEVICE(PCI_VENDOR_ID_INTEL, MEI_DEV_ID_ICH9M_4)},
	{PCI_DEVICE(PCI_VENDOR_ID_INTEL, MEI_DEV_ID_ICH10_1)},
	{PCI_DEVICE(PCI_VENDOR_ID_INTEL, MEI_DEV_ID_ICH10_2)},
	{PCI_DEVICE(PCI_VENDOR_ID_INTEL, MEI_DEV_ID_ICH10_3)},
	{PCI_DEVICE(PCI_VENDOR_ID_INTEL, MEI_DEV_ID_ICH10_4)},
	{PCI_DEVICE(PCI_VENDOR_ID_INTEL, MEI_DEV_ID_IBXPK_1)},
	{PCI_DEVICE(PCI_VENDOR_ID_INTEL, MEI_DEV_ID_IBXPK_2)},
	{PCI_DEVICE(PCI_VENDOR_ID_INTEL, MEI_DEV_ID_CPT_1)},
	{PCI_DEVICE(PCI_VENDOR_ID_INTEL, MEI_DEV_ID_PBG_1)},
	{PCI_DEVICE(PCI_VENDOR_ID_INTEL, MEI_DEV_ID_PPT_1)},
	{PCI_DEVICE(PCI_VENDOR_ID_INTEL, MEI_DEV_ID_PPT_2)},
	{PCI_DEVICE(PCI_VENDOR_ID_INTEL, MEI_DEV_ID_PPT_3)},
	{PCI_DEVICE(PCI_VENDOR_ID_INTEL, MEI_DEV_ID_LPT)},
	{PCI_DEVICE(PCI_VENDOR_ID_INTEL, MEI_DEV_ID_LPT_LP)},

	/* required last entry */
	{0, }
};

MODULE_DEVICE_TABLE(pci, mei_pci_tbl);

static DEFINE_MUTEX(mei_mutex);


/**
 * mei_quirk_probe - probe for devices that doesn't valid ME interface
 * @pdev: PCI device structure
 * @ent: entry into pci_device_table
 *
 * returns true if ME Interface is valid, false otherwise
 */
static bool mei_quirk_probe(struct pci_dev *pdev,
				const struct pci_device_id *ent)
{
	u32 reg;
	if (ent->device == MEI_DEV_ID_PBG_1) {
		pci_read_config_dword(pdev, 0x48, &reg);
		/* make sure that bit 9 is up and bit 10 is down */
		if ((reg & 0x600) == 0x200) {
			dev_info(&pdev->dev, "Device doesn't have valid ME Interface\n");
			return false;
		}
	}
	return true;
}
/**
 * mei_probe - Device Initialization Routine
 *
 * @pdev: PCI device structure
 * @ent: entry in kcs_pci_tbl
 *
 * returns 0 on success, <0 on failure.
 */
static int mei_probe(struct pci_dev *pdev,
				const struct pci_device_id *ent)
{
	struct mei_device *dev;
	int err;

	mutex_lock(&mei_mutex);

	if (!mei_quirk_probe(pdev, ent)) {
		err = -ENODEV;
		goto end;
	}

	if (mei_pdev) {
		err = -EEXIST;
		goto end;
	}
	/* enable pci dev */
	err = pci_enable_device(pdev);
	if (err) {
		dev_err(&pdev->dev, "failed to enable pci device.\n");
		goto end;
	}
	/* set PCI host mastering  */
	pci_set_master(pdev);
	/* pci request regions for mei driver */
	err = pci_request_regions(pdev, KBUILD_MODNAME);
	if (err) {
		dev_err(&pdev->dev, "failed to get pci regions.\n");
		goto disable_device;
	}
	/* allocates and initializes the mei dev structure */
	dev = mei_device_init(pdev);
	if (!dev) {
		err = -ENOMEM;
		goto release_regions;
	}
	/* mapping  IO device memory */
	dev->mem_addr = pci_iomap(pdev, 0, 0);
	if (!dev->mem_addr) {
		dev_err(&pdev->dev, "mapping I/O device memory failure.\n");
		err = -ENOMEM;
		goto free_device;
	}
	pci_enable_msi(pdev);

	 /* request and enable interrupt */
	if (pci_dev_msi_enabled(pdev))
		err = request_threaded_irq(pdev->irq,
			NULL,
			mei_interrupt_thread_handler,
			IRQF_ONESHOT, KBUILD_MODNAME, dev);
	else
		err = request_threaded_irq(pdev->irq,
			mei_interrupt_quick_handler,
			mei_interrupt_thread_handler,
			IRQF_SHARED, KBUILD_MODNAME, dev);

	if (err) {
		dev_err(&pdev->dev, "request_threaded_irq failure. irq = %d\n",
		       pdev->irq);
		goto disable_msi;
	}

	if (mei_hw_init(dev)) {
		dev_err(&pdev->dev, "init hw failure.\n");
		err = -ENODEV;
		goto release_irq;
	}

	err = mei_register(&pdev->dev);
	if (err)
		goto release_irq;

	mei_pdev = pdev;
	pci_set_drvdata(pdev, dev);


	schedule_delayed_work(&dev->timer_work, HZ);

	mutex_unlock(&mei_mutex);

	pr_debug("initialization successful.\n");

	return 0;

release_irq:
	mei_disable_interrupts(dev);
	flush_scheduled_work();
	free_irq(pdev->irq, dev);
disable_msi:
	pci_disable_msi(pdev);
	pci_iounmap(pdev, dev->mem_addr);
free_device:
	kfree(dev);
release_regions:
	pci_release_regions(pdev);
disable_device:
	pci_disable_device(pdev);
end:
	mutex_unlock(&mei_mutex);
	dev_err(&pdev->dev, "initialization failed.\n");
	return err;
}

/**
 * mei_remove - Device Removal Routine
 *
 * @pdev: PCI device structure
 *
 * mei_remove is called by the PCI subsystem to alert the driver
 * that it should release a PCI device.
 */
static void mei_remove(struct pci_dev *pdev)
{
	struct mei_device *dev;

	if (mei_pdev != pdev)
		return;

	dev = pci_get_drvdata(pdev);
	if (!dev)
		return;

	mutex_lock(&dev->device_lock);

	cancel_delayed_work(&dev->timer_work);

	mei_wd_stop(dev);

	mei_pdev = NULL;

	if (dev->iamthif_cl.state == MEI_FILE_CONNECTED) {
		dev->iamthif_cl.state = MEI_FILE_DISCONNECTING;
		mei_cl_disconnect(&dev->iamthif_cl);
	}
	if (dev->wd_cl.state == MEI_FILE_CONNECTED) {
		dev->wd_cl.state = MEI_FILE_DISCONNECTING;
		mei_cl_disconnect(&dev->wd_cl);
	}

	/* Unregistering watchdog device */
	mei_watchdog_unregister(dev);

	/* remove entry if already in list */
	dev_dbg(&pdev->dev, "list del iamthif and wd file list.\n");

	if (dev->open_handle_count > 0)
		dev->open_handle_count--;
	mei_cl_unlink(&dev->wd_cl);

	if (dev->open_handle_count > 0)
		dev->open_handle_count--;
	mei_cl_unlink(&dev->iamthif_cl);

	dev->iamthif_current_cb = NULL;
	dev->me_clients_num = 0;

	mutex_unlock(&dev->device_lock);

	flush_scheduled_work();

	/* disable interrupts */
	mei_disable_interrupts(dev);

	free_irq(pdev->irq, dev);
	pci_disable_msi(pdev);
	pci_set_drvdata(pdev, NULL);

	if (dev->mem_addr)
		pci_iounmap(pdev, dev->mem_addr);

	kfree(dev);

	pci_release_regions(pdev);
	pci_disable_device(pdev);

	mei_deregister();

}
#ifdef CONFIG_PM
static int mei_pci_suspend(struct device *device)
{
	struct pci_dev *pdev = to_pci_dev(device);
	struct mei_device *dev = pci_get_drvdata(pdev);
	int err;

	if (!dev)
		return -ENODEV;
	mutex_lock(&dev->device_lock);

	cancel_delayed_work(&dev->timer_work);

	/* Stop watchdog if exists */
	err = mei_wd_stop(dev);
	/* Set new mei state */
	if (dev->dev_state == MEI_DEV_ENABLED ||
	    dev->dev_state == MEI_DEV_RECOVERING_FROM_RESET) {
		dev->dev_state = MEI_DEV_POWER_DOWN;
		mei_reset(dev, 0);
	}
	mutex_unlock(&dev->device_lock);

	free_irq(pdev->irq, dev);
	pci_disable_msi(pdev);

	return err;
}

static int mei_pci_resume(struct device *device)
{
	struct pci_dev *pdev = to_pci_dev(device);
	struct mei_device *dev;
	int err;

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

	pci_enable_msi(pdev);

	/* request and enable interrupt */
	if (pci_dev_msi_enabled(pdev))
		err = request_threaded_irq(pdev->irq,
			NULL,
			mei_interrupt_thread_handler,
			IRQF_ONESHOT, KBUILD_MODNAME, dev);
	else
		err = request_threaded_irq(pdev->irq,
			mei_interrupt_quick_handler,
			mei_interrupt_thread_handler,
			IRQF_SHARED, KBUILD_MODNAME, dev);

	if (err) {
		dev_err(&pdev->dev, "request_threaded_irq failed: irq = %d.\n",
				pdev->irq);
		return err;
	}

	mutex_lock(&dev->device_lock);
	dev->dev_state = MEI_DEV_POWER_UP;
	mei_reset(dev, 1);
	mutex_unlock(&dev->device_lock);

	/* Start timer if stopped in suspend */
	schedule_delayed_work(&dev->timer_work, HZ);

	return err;
}
static SIMPLE_DEV_PM_OPS(mei_pm_ops, mei_pci_suspend, mei_pci_resume);
#define MEI_PM_OPS	(&mei_pm_ops)
#else
#define MEI_PM_OPS	NULL
#endif /* CONFIG_PM */
/*
 *  PCI driver structure
 */
static struct pci_driver mei_driver = {
	.name = KBUILD_MODNAME,
	.id_table = mei_pci_tbl,
	.probe = mei_probe,
	.remove = mei_remove,
	.shutdown = mei_remove,
	.driver.pm = MEI_PM_OPS,
};

module_pci_driver(mei_driver);

MODULE_AUTHOR("Intel Corporation");
MODULE_DESCRIPTION("Intel(R) Management Engine Interface");
MODULE_LICENSE("GPL v2");
Commit	Line	Data
2703d4b2 TW	1	/*
	2	*
	3	* Intel Management Engine Interface (Intel MEI) Linux driver
	4	* Copyright (c) 2003-2012, Intel Corporation.
	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
	17	#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
	18
	19	#include <linux/module.h>
	20	#include <linux/moduleparam.h>
	21	#include <linux/kernel.h>
	22	#include <linux/device.h>
	23	#include <linux/fs.h>
	24	#include <linux/errno.h>
	25	#include <linux/types.h>
	26	#include <linux/fcntl.h>
	27	#include <linux/aio.h>
	28	#include <linux/pci.h>
	29	#include <linux/poll.h>
	30	#include <linux/init.h>
	31	#include <linux/ioctl.h>
	32	#include <linux/cdev.h>
	33	#include <linux/sched.h>
	34	#include <linux/uuid.h>
	35	#include <linux/compat.h>
	36	#include <linux/jiffies.h>
	37	#include <linux/interrupt.h>
	38	#include <linux/miscdevice.h>
	39
	40	#include <linux/mei.h>
	41
	42	#include "mei_dev.h"
	43	#include "hw-me.h"
	44	#include "client.h"
	45
	46	/* AMT device is a singleton on the platform */
	47	static struct pci_dev *mei_pdev;
	48
	49	/* mei_pci_tbl - PCI Device ID Table */
	50	static DEFINE_PCI_DEVICE_TABLE(mei_pci_tbl) = {
	51	{PCI_DEVICE(PCI_VENDOR_ID_INTEL, MEI_DEV_ID_82946GZ)},
	52	{PCI_DEVICE(PCI_VENDOR_ID_INTEL, MEI_DEV_ID_82G35)},
	53	{PCI_DEVICE(PCI_VENDOR_ID_INTEL, MEI_DEV_ID_82Q965)},
	54	{PCI_DEVICE(PCI_VENDOR_ID_INTEL, MEI_DEV_ID_82G965)},
	55	{PCI_DEVICE(PCI_VENDOR_ID_INTEL, MEI_DEV_ID_82GM965)},
	56	{PCI_DEVICE(PCI_VENDOR_ID_INTEL, MEI_DEV_ID_82GME965)},
	57	{PCI_DEVICE(PCI_VENDOR_ID_INTEL, MEI_DEV_ID_ICH9_82Q35)},
	58	{PCI_DEVICE(PCI_VENDOR_ID_INTEL, MEI_DEV_ID_ICH9_82G33)},
	59	{PCI_DEVICE(PCI_VENDOR_ID_INTEL, MEI_DEV_ID_ICH9_82Q33)},
	60	{PCI_DEVICE(PCI_VENDOR_ID_INTEL, MEI_DEV_ID_ICH9_82X38)},
	61	{PCI_DEVICE(PCI_VENDOR_ID_INTEL, MEI_DEV_ID_ICH9_3200)},
	62	{PCI_DEVICE(PCI_VENDOR_ID_INTEL, MEI_DEV_ID_ICH9_6)},
	63	{PCI_DEVICE(PCI_VENDOR_ID_INTEL, MEI_DEV_ID_ICH9_7)},
	64	{PCI_DEVICE(PCI_VENDOR_ID_INTEL, MEI_DEV_ID_ICH9_8)},
65	{PCI_DEVICE(PCI_VENDOR_ID_INTEL, MEI_DEV_ID_ICH9_9)},
66	{PCI_DEVICE(PCI_VENDOR_ID_INTEL, MEI_DEV_ID_ICH9_10)},
67	{PCI_DEVICE(PCI_VENDOR_ID_INTEL, MEI_DEV_ID_ICH9M_1)},
68	{PCI_DEVICE(PCI_VENDOR_ID_INTEL, MEI_DEV_ID_ICH9M_2)},
69	{PCI_DEVICE(PCI_VENDOR_ID_INTEL, MEI_DEV_ID_ICH9M_3)},
70	{PCI_DEVICE(PCI_VENDOR_ID_INTEL, MEI_DEV_ID_ICH9M_4)},
71	{PCI_DEVICE(PCI_VENDOR_ID_INTEL, MEI_DEV_ID_ICH10_1)},
72	{PCI_DEVICE(PCI_VENDOR_ID_INTEL, MEI_DEV_ID_ICH10_2)},
73	{PCI_DEVICE(PCI_VENDOR_ID_INTEL, MEI_DEV_ID_ICH10_3)},
74	{PCI_DEVICE(PCI_VENDOR_ID_INTEL, MEI_DEV_ID_ICH10_4)},
75	{PCI_DEVICE(PCI_VENDOR_ID_INTEL, MEI_DEV_ID_IBXPK_1)},
76	{PCI_DEVICE(PCI_VENDOR_ID_INTEL, MEI_DEV_ID_IBXPK_2)},
77	{PCI_DEVICE(PCI_VENDOR_ID_INTEL, MEI_DEV_ID_CPT_1)},
78	{PCI_DEVICE(PCI_VENDOR_ID_INTEL, MEI_DEV_ID_PBG_1)},
79	{PCI_DEVICE(PCI_VENDOR_ID_INTEL, MEI_DEV_ID_PPT_1)},
80	{PCI_DEVICE(PCI_VENDOR_ID_INTEL, MEI_DEV_ID_PPT_2)},
81	{PCI_DEVICE(PCI_VENDOR_ID_INTEL, MEI_DEV_ID_PPT_3)},
82	{PCI_DEVICE(PCI_VENDOR_ID_INTEL, MEI_DEV_ID_LPT)},
83	{PCI_DEVICE(PCI_VENDOR_ID_INTEL, MEI_DEV_ID_LPT_LP)},
84
85	/* required last entry */
86	{0, }
87	};
88
89	MODULE_DEVICE_TABLE(pci, mei_pci_tbl);
90
91	static DEFINE_MUTEX(mei_mutex);
92
93
94	/**
95	* mei_quirk_probe - probe for devices that doesn't valid ME interface
96	* @pdev: PCI device structure
97	* @ent: entry into pci_device_table
98	*
99	* returns true if ME Interface is valid, false otherwise
100	*/
101	static bool mei_quirk_probe(struct pci_dev *pdev,
102	const struct pci_device_id *ent)
103	{
104	u32 reg;
105	if (ent->device == MEI_DEV_ID_PBG_1) {
106	pci_read_config_dword(pdev, 0x48, &reg);
107	/* make sure that bit 9 is up and bit 10 is down */
108	if ((reg & 0x600) == 0x200) {
109	dev_info(&pdev->dev, "Device doesn't have valid ME Interface\n");
110	return false;
111	}
112	}
113	return true;
114	}
115	/**
116	* mei_probe - Device Initialization Routine
117	*
118	* @pdev: PCI device structure
119	* @ent: entry in kcs_pci_tbl
120	*
121	* returns 0 on success, <0 on failure.
122	*/
123	static int mei_probe(struct pci_dev *pdev,
124	const struct pci_device_id *ent)
125	{
126	struct mei_device *dev;
127	int err;
128
129	mutex_lock(&mei_mutex);
130
131	if (!mei_quirk_probe(pdev, ent)) {
132	err = -ENODEV;
133	goto end;
134	}
135
136	if (mei_pdev) {
137	err = -EEXIST;
138	goto end;
139	}
140	/* enable pci dev */
141	err = pci_enable_device(pdev);
142	if (err) {
143	dev_err(&pdev->dev, "failed to enable pci device.\n");
144	goto end;
145	}
146	/* set PCI host mastering */
147	pci_set_master(pdev);
148	/* pci request regions for mei driver */
149	err = pci_request_regions(pdev, KBUILD_MODNAME);
150	if (err) {
151	dev_err(&pdev->dev, "failed to get pci regions.\n");
152	goto disable_device;
153	}
154	/* allocates and initializes the mei dev structure */
155	dev = mei_device_init(pdev);
156	if (!dev) {
157	err = -ENOMEM;
158	goto release_regions;
159	}
160	/* mapping IO device memory */
161	dev->mem_addr = pci_iomap(pdev, 0, 0);
162	if (!dev->mem_addr) {
163	dev_err(&pdev->dev, "mapping I/O device memory failure.\n");
164	err = -ENOMEM;
165	goto free_device;
166	}
167	pci_enable_msi(pdev);
168
169	/* request and enable interrupt */
170	if (pci_dev_msi_enabled(pdev))
171	err = request_threaded_irq(pdev->irq,
172	NULL,
173	mei_interrupt_thread_handler,
174	IRQF_ONESHOT, KBUILD_MODNAME, dev);
175	else
176	err = request_threaded_irq(pdev->irq,
177	mei_interrupt_quick_handler,
178	mei_interrupt_thread_handler,
179	IRQF_SHARED, KBUILD_MODNAME, dev);
180
181	if (err) {
182	dev_err(&pdev->dev, "request_threaded_irq failure. irq = %d\n",
183	pdev->irq);
184	goto disable_msi;
185	}
186
187	if (mei_hw_init(dev)) {
188	dev_err(&pdev->dev, "init hw failure.\n");
189	err = -ENODEV;
190	goto release_irq;
191	}
192
193	err = mei_register(&pdev->dev);
194	if (err)
195	goto release_irq;
196
197	mei_pdev = pdev;
198	pci_set_drvdata(pdev, dev);
199
200
201	schedule_delayed_work(&dev->timer_work, HZ);
202
203	mutex_unlock(&mei_mutex);
204
205	pr_debug("initialization successful.\n");
206
207	return 0;
208
209	release_irq:
210	mei_disable_interrupts(dev);
211	flush_scheduled_work();
212	free_irq(pdev->irq, dev);
213	disable_msi:
214	pci_disable_msi(pdev);
215	pci_iounmap(pdev, dev->mem_addr);
216	free_device:
217	kfree(dev);
218	release_regions:
219	pci_release_regions(pdev);
220	disable_device:
221	pci_disable_device(pdev);
222	end:
223	mutex_unlock(&mei_mutex);
224	dev_err(&pdev->dev, "initialization failed.\n");
225	return err;
226	}
227
228	/**
229	* mei_remove - Device Removal Routine
230	*
231	* @pdev: PCI device structure
232	*
233	* mei_remove is called by the PCI subsystem to alert the driver
234	* that it should release a PCI device.
235	*/
236	static void mei_remove(struct pci_dev *pdev)
237	{
238	struct mei_device *dev;
239
240	if (mei_pdev != pdev)
241	return;
242
243	dev = pci_get_drvdata(pdev);
244	if (!dev)
245	return;
246
247	mutex_lock(&dev->device_lock);
248
249	cancel_delayed_work(&dev->timer_work);
250
251	mei_wd_stop(dev);
252
253	mei_pdev = NULL;
254
255	if (dev->iamthif_cl.state == MEI_FILE_CONNECTED) {
256	dev->iamthif_cl.state = MEI_FILE_DISCONNECTING;
257	mei_cl_disconnect(&dev->iamthif_cl);
258	}
259	if (dev->wd_cl.state == MEI_FILE_CONNECTED) {
260	dev->wd_cl.state = MEI_FILE_DISCONNECTING;
261	mei_cl_disconnect(&dev->wd_cl);
262	}
263
264	/* Unregistering watchdog device */
265	mei_watchdog_unregister(dev);
266
267	/* remove entry if already in list */
268	dev_dbg(&pdev->dev, "list del iamthif and wd file list.\n");
269
270	if (dev->open_handle_count > 0)
271	dev->open_handle_count--;
272	mei_cl_unlink(&dev->wd_cl);
273
274	if (dev->open_handle_count > 0)
275	dev->open_handle_count--;
276	mei_cl_unlink(&dev->iamthif_cl);
277
278	dev->iamthif_current_cb = NULL;
279	dev->me_clients_num = 0;
280
281	mutex_unlock(&dev->device_lock);
282
283	flush_scheduled_work();
284
285	/* disable interrupts */
286	mei_disable_interrupts(dev);
287
288	free_irq(pdev->irq, dev);
289	pci_disable_msi(pdev);
290	pci_set_drvdata(pdev, NULL);
291
292	if (dev->mem_addr)
293	pci_iounmap(pdev, dev->mem_addr);
294
295	kfree(dev);
296
297	pci_release_regions(pdev);
298	pci_disable_device(pdev);
299
300	mei_deregister();
301
302	}
303	#ifdef CONFIG_PM
304	static int mei_pci_suspend(struct device *device)
305	{
306	struct pci_dev *pdev = to_pci_dev(device);
307	struct mei_device *dev = pci_get_drvdata(pdev);
308	int err;
309
310	if (!dev)
311	return -ENODEV;
312	mutex_lock(&dev->device_lock);
313
314	cancel_delayed_work(&dev->timer_work);
315
316	/* Stop watchdog if exists */
317	err = mei_wd_stop(dev);
318	/* Set new mei state */
319	if (dev->dev_state == MEI_DEV_ENABLED \|\|
320	dev->dev_state == MEI_DEV_RECOVERING_FROM_RESET) {
321	dev->dev_state = MEI_DEV_POWER_DOWN;
322	mei_reset(dev, 0);
323	}
324	mutex_unlock(&dev->device_lock);
325
326	free_irq(pdev->irq, dev);
327	pci_disable_msi(pdev);
328
329	return err;
330	}
331
332	static int mei_pci_resume(struct device *device)
333	{
334	struct pci_dev *pdev = to_pci_dev(device);
335	struct mei_device *dev;
336	int err;
337
338	dev = pci_get_drvdata(pdev);
339	if (!dev)
340	return -ENODEV;
341
342	pci_enable_msi(pdev);
343
344	/* request and enable interrupt */
345	if (pci_dev_msi_enabled(pdev))
346	err = request_threaded_irq(pdev->irq,
347	NULL,
348	mei_interrupt_thread_handler,
349	IRQF_ONESHOT, KBUILD_MODNAME, dev);
350	else
351	err = request_threaded_irq(pdev->irq,
352	mei_interrupt_quick_handler,
353	mei_interrupt_thread_handler,
354	IRQF_SHARED, KBUILD_MODNAME, dev);
355
356	if (err) {
357	dev_err(&pdev->dev, "request_threaded_irq failed: irq = %d.\n",
358	pdev->irq);
359	return err;
360	}
361
362	mutex_lock(&dev->device_lock);
363	dev->dev_state = MEI_DEV_POWER_UP;
364	mei_reset(dev, 1);
365	mutex_unlock(&dev->device_lock);
366
367	/* Start timer if stopped in suspend */
368	schedule_delayed_work(&dev->timer_work, HZ);
369
370	return err;
371	}
372	static SIMPLE_DEV_PM_OPS(mei_pm_ops, mei_pci_suspend, mei_pci_resume);
373	#define MEI_PM_OPS (&mei_pm_ops)
374	#else
375	#define MEI_PM_OPS NULL
376	#endif /* CONFIG_PM */
377	/*
378	* PCI driver structure
379	*/
380	static struct pci_driver mei_driver = {
381	.name = KBUILD_MODNAME,
382	.id_table = mei_pci_tbl,
383	.probe = mei_probe,
384	.remove = mei_remove,
385	.shutdown = mei_remove,
386	.driver.pm = MEI_PM_OPS,
387	};
388
389	module_pci_driver(mei_driver);
390
391	MODULE_AUTHOR("Intel Corporation");
392	MODULE_DESCRIPTION("Intel(R) Management Engine Interface");
393	MODULE_LICENSE("GPL v2");