drivers/net/wireless/rt2x00/rt2x00pci.c - maze/linux - Git at Google

 /*
 	Copyright (C) 2004 - 2008 rt2x00 SourceForge Project
 	<http://rt2x00.serialmonkey.com>

 	This program is free software; you can redistribute it and/or modify
 	it under the terms of the GNU General Public License as published by
 	the Free Software Foundation; either version 2 of the License, or
 	(at your option) any later version.

 	This program is distributed in the hope that 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.

 	You should have received a copy of the GNU General Public License
 	along with this program; if not, write to the
 	Free Software Foundation, Inc.,
 	59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
  */

 /*
 	Module: rt2x00pci
 	Abstract: rt2x00 generic pci device routines.
  */

 #include <linux/dma-mapping.h>
 #include <linux/kernel.h>
 #include <linux/module.h>
 #include <linux/pci.h>

 #include "rt2x00.h"
 #include "rt2x00pci.h"

 /*
  * Register access.
  */
 int rt2x00pci_regbusy_read(struct rt2x00_dev *rt2x00dev,
 			   const unsigned int offset,
 			   const struct rt2x00_field32 field,
 			   u32 *reg)
 {
 	unsigned int i;

 	for (i = 0; i < REGISTER_BUSY_COUNT; i++) {
 		rt2x00pci_register_read(rt2x00dev, offset, reg);
 		if (!rt2x00_get_field32(*reg, field))
 			return 1;
 		udelay(REGISTER_BUSY_DELAY);
 	}

 	ERROR(rt2x00dev, "Indirect register access failed: "
 	      "offset=0x%.08x, value=0x%.08x\n", offset, *reg);
 	*reg = ~0;

 	return 0;
 }
 EXPORT_SYMBOL_GPL(rt2x00pci_regbusy_read);

 /*
  * TX data handlers.
  */
 int rt2x00pci_write_tx_data(struct queue_entry *entry)
 {
 	struct rt2x00_dev *rt2x00dev = entry->queue->rt2x00dev;
 	struct queue_entry_priv_pci *entry_priv = entry->priv_data;
 	struct skb_frame_desc *skbdesc;

 	/*
 	 * This should not happen, we already checked the entry
 	 * was ours. When the hardware disagrees there has been
 	 * a queue corruption!
 	 */
 	if (unlikely(rt2x00dev->ops->lib->get_entry_state(entry))) {
 		ERROR(rt2x00dev,
 		      "Corrupt queue %d, accessing entry which is not ours.\n"
 		      "Please file bug report to %s.\n",
 		      entry->queue->qid, DRV_PROJECT);
 		return -EINVAL;
 	}

 	/*
 	 * Fill in skb descriptor
 	 */
 	skbdesc = get_skb_frame_desc(entry->skb);
 	skbdesc->desc = entry_priv->desc;
 	skbdesc->desc_len = entry->queue->desc_size;

 	return 0;
 }
 EXPORT_SYMBOL_GPL(rt2x00pci_write_tx_data);

 /*
  * TX/RX data handlers.
  */
 void rt2x00pci_rxdone(struct rt2x00_dev *rt2x00dev)
 {
 	struct data_queue *queue = rt2x00dev->rx;
 	struct queue_entry *entry;
 	struct queue_entry_priv_pci *entry_priv;
 	struct skb_frame_desc *skbdesc;

 	while (1) {
 		entry = rt2x00queue_get_entry(queue, Q_INDEX);
 		entry_priv = entry->priv_data;

 		if (rt2x00dev->ops->lib->get_entry_state(entry))
 			break;

 		/*
 		 * Fill in desc fields of the skb descriptor
 		 */
 		skbdesc = get_skb_frame_desc(entry->skb);
 		skbdesc->desc = entry_priv->desc;
 		skbdesc->desc_len = entry->queue->desc_size;

 		/*
 		 * Send the frame to rt2x00lib for further processing.
 		 */
 		rt2x00lib_rxdone(rt2x00dev, entry);
 	}
 }
 EXPORT_SYMBOL_GPL(rt2x00pci_rxdone);

 /*
  * Device initialization handlers.
  */
 static int rt2x00pci_alloc_queue_dma(struct rt2x00_dev *rt2x00dev,
 				     struct data_queue *queue)
 {
 	struct queue_entry_priv_pci *entry_priv;
 	void *addr;
 	dma_addr_t dma;
 	unsigned int i;

 	/*
 	 * Allocate DMA memory for descriptor and buffer.
 	 */
 	addr = dma_alloc_coherent(rt2x00dev->dev,
 				  queue->limit * queue->desc_size,
 				  &dma, GFP_KERNEL | GFP_DMA);
 	if (!addr)
 		return -ENOMEM;

 	memset(addr, 0, queue->limit * queue->desc_size);

 	/*
 	 * Initialize all queue entries to contain valid addresses.
 	 */
 	for (i = 0; i < queue->limit; i++) {
 		entry_priv = queue->entries[i].priv_data;
 		entry_priv->desc = addr + i * queue->desc_size;
 		entry_priv->desc_dma = dma + i * queue->desc_size;
 	}

 	return 0;
 }

 static void rt2x00pci_free_queue_dma(struct rt2x00_dev *rt2x00dev,
 				     struct data_queue *queue)
 {
 	struct queue_entry_priv_pci *entry_priv =
 	    queue->entries[0].priv_data;

 	if (entry_priv->desc)
 		dma_free_coherent(rt2x00dev->dev,
 				  queue->limit * queue->desc_size,
 				  entry_priv->desc, entry_priv->desc_dma);
 	entry_priv->desc = NULL;
 }

 int rt2x00pci_initialize(struct rt2x00_dev *rt2x00dev)
 {
 	struct pci_dev *pci_dev = to_pci_dev(rt2x00dev->dev);
 	struct data_queue *queue;
 	int status;

 	/*
 	 * Allocate DMA
 	 */
 	queue_for_each(rt2x00dev, queue) {
 		status = rt2x00pci_alloc_queue_dma(rt2x00dev, queue);
 		if (status)
 			goto exit;
 	}

 	/*
 	 * Register interrupt handler.
 	 */
 	status = request_irq(pci_dev->irq, rt2x00dev->ops->lib->irq_handler,
 			     IRQF_SHARED, pci_name(pci_dev), rt2x00dev);
 	if (status) {
 		ERROR(rt2x00dev, "IRQ %d allocation failed (error %d).\n",
 		      pci_dev->irq, status);
 		goto exit;
 	}

 	return 0;

 exit:
 	queue_for_each(rt2x00dev, queue)
 		rt2x00pci_free_queue_dma(rt2x00dev, queue);

 	return status;
 }
 EXPORT_SYMBOL_GPL(rt2x00pci_initialize);

 void rt2x00pci_uninitialize(struct rt2x00_dev *rt2x00dev)
 {
 	struct data_queue *queue;

 	/*
 	 * Free irq line.
 	 */
 	free_irq(to_pci_dev(rt2x00dev->dev)->irq, rt2x00dev);

 	/*
 	 * Free DMA
 	 */
 	queue_for_each(rt2x00dev, queue)
 		rt2x00pci_free_queue_dma(rt2x00dev, queue);
 }
 EXPORT_SYMBOL_GPL(rt2x00pci_uninitialize);

 /*
  * PCI driver handlers.
  */
 static void rt2x00pci_free_reg(struct rt2x00_dev *rt2x00dev)
 {
 	kfree(rt2x00dev->rf);
 	rt2x00dev->rf = NULL;

 	kfree(rt2x00dev->eeprom);
 	rt2x00dev->eeprom = NULL;

 	if (rt2x00dev->csr.base) {
 		iounmap(rt2x00dev->csr.base);
 		rt2x00dev->csr.base = NULL;
 	}
 }

 static int rt2x00pci_alloc_reg(struct rt2x00_dev *rt2x00dev)
 {
 	struct pci_dev *pci_dev = to_pci_dev(rt2x00dev->dev);

 	rt2x00dev->csr.base = pci_ioremap_bar(pci_dev, 0);
 	if (!rt2x00dev->csr.base)
 		goto exit;

 	rt2x00dev->eeprom = kzalloc(rt2x00dev->ops->eeprom_size, GFP_KERNEL);
 	if (!rt2x00dev->eeprom)
 		goto exit;

 	rt2x00dev->rf = kzalloc(rt2x00dev->ops->rf_size, GFP_KERNEL);
 	if (!rt2x00dev->rf)
 		goto exit;

 	return 0;

 exit:
 	ERROR_PROBE("Failed to allocate registers.\n");

 	rt2x00pci_free_reg(rt2x00dev);

 	return -ENOMEM;
 }

 int rt2x00pci_probe(struct pci_dev *pci_dev, const struct pci_device_id *id)
 {
 	struct rt2x00_ops *ops = (struct rt2x00_ops *)id->driver_data;
 	struct ieee80211_hw *hw;
 	struct rt2x00_dev *rt2x00dev;
 	int retval;

 	retval = pci_request_regions(pci_dev, pci_name(pci_dev));
 	if (retval) {
 		ERROR_PROBE("PCI request regions failed.\n");
 		return retval;
 	}

 	retval = pci_enable_device(pci_dev);
 	if (retval) {
 		ERROR_PROBE("Enable device failed.\n");
 		goto exit_release_regions;
 	}

 	pci_set_master(pci_dev);

 	if (pci_set_mwi(pci_dev))
 		ERROR_PROBE("MWI not available.\n");

 	if (dma_set_mask(&pci_dev->dev, DMA_32BIT_MASK)) {
 		ERROR_PROBE("PCI DMA not supported.\n");
 		retval = -EIO;
 		goto exit_disable_device;
 	}

 	hw = ieee80211_alloc_hw(sizeof(struct rt2x00_dev), ops->hw);
 	if (!hw) {
 		ERROR_PROBE("Failed to allocate hardware.\n");
 		retval = -ENOMEM;
 		goto exit_disable_device;
 	}

 	pci_set_drvdata(pci_dev, hw);

 	rt2x00dev = hw->priv;
 	rt2x00dev->dev = &pci_dev->dev;
 	rt2x00dev->ops = ops;
 	rt2x00dev->hw = hw;

 	retval = rt2x00pci_alloc_reg(rt2x00dev);
 	if (retval)
 		goto exit_free_device;

 	retval = rt2x00lib_probe_dev(rt2x00dev);
 	if (retval)
 		goto exit_free_reg;

 	return 0;

 exit_free_reg:
 	rt2x00pci_free_reg(rt2x00dev);

 exit_free_device:
 	ieee80211_free_hw(hw);

 exit_disable_device:
 	if (retval != -EBUSY)
 		pci_disable_device(pci_dev);

 exit_release_regions:
 	pci_release_regions(pci_dev);

 	pci_set_drvdata(pci_dev, NULL);

 	return retval;
 }
 EXPORT_SYMBOL_GPL(rt2x00pci_probe);

 void rt2x00pci_remove(struct pci_dev *pci_dev)
 {
 	struct ieee80211_hw *hw = pci_get_drvdata(pci_dev);
 	struct rt2x00_dev *rt2x00dev = hw->priv;

 	/*
 	 * Free all allocated data.
 	 */
 	rt2x00lib_remove_dev(rt2x00dev);
 	rt2x00pci_free_reg(rt2x00dev);
 	ieee80211_free_hw(hw);

 	/*
 	 * Free the PCI device data.
 	 */
 	pci_set_drvdata(pci_dev, NULL);
 	pci_disable_device(pci_dev);
 	pci_release_regions(pci_dev);
 }
 EXPORT_SYMBOL_GPL(rt2x00pci_remove);

 #ifdef CONFIG_PM
 int rt2x00pci_suspend(struct pci_dev *pci_dev, pm_message_t state)
 {
 	struct ieee80211_hw *hw = pci_get_drvdata(pci_dev);
 	struct rt2x00_dev *rt2x00dev = hw->priv;
 	int retval;

 	retval = rt2x00lib_suspend(rt2x00dev, state);
 	if (retval)
 		return retval;

 	rt2x00pci_free_reg(rt2x00dev);

 	pci_save_state(pci_dev);
 	pci_disable_device(pci_dev);
 	return pci_set_power_state(pci_dev, pci_choose_state(pci_dev, state));
 }
 EXPORT_SYMBOL_GPL(rt2x00pci_suspend);

 int rt2x00pci_resume(struct pci_dev *pci_dev)
 {
 	struct ieee80211_hw *hw = pci_get_drvdata(pci_dev);
 	struct rt2x00_dev *rt2x00dev = hw->priv;
 	int retval;

 	if (pci_set_power_state(pci_dev, PCI_D0) ||
 	    pci_enable_device(pci_dev) ||
 	    pci_restore_state(pci_dev)) {
 		ERROR(rt2x00dev, "Failed to resume device.\n");
 		return -EIO;
 	}

 	retval = rt2x00pci_alloc_reg(rt2x00dev);
 	if (retval)
 		return retval;

 	retval = rt2x00lib_resume(rt2x00dev);
 	if (retval)
 		goto exit_free_reg;

 	return 0;

 exit_free_reg:
 	rt2x00pci_free_reg(rt2x00dev);

 	return retval;
 }
 EXPORT_SYMBOL_GPL(rt2x00pci_resume);
 #endif /* CONFIG_PM */

 /*
  * rt2x00pci module information.
  */
 MODULE_AUTHOR(DRV_PROJECT);
 MODULE_VERSION(DRV_VERSION);
 MODULE_DESCRIPTION("rt2x00 pci library");
 MODULE_LICENSE("GPL");
	/*
	Copyright (C) 2004 - 2008 rt2x00 SourceForge Project
	<http://rt2x00.serialmonkey.com>

	This program is free software; you can redistribute it and/or modify
	it under the terms of the GNU General Public License as published by
	the Free Software Foundation; either version 2 of the License, or
	(at your option) any later version.

	This program is distributed in the hope that 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.

	You should have received a copy of the GNU General Public License
	along with this program; if not, write to the
	Free Software Foundation, Inc.,
	59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
	*/

	/*
	Module: rt2x00pci
	Abstract: rt2x00 generic pci device routines.
	*/

	#include <linux/dma-mapping.h>
	#include <linux/kernel.h>
	#include <linux/module.h>
	#include <linux/pci.h>

	#include "rt2x00.h"
	#include "rt2x00pci.h"

	/*
	* Register access.
	*/
	int rt2x00pci_regbusy_read(struct rt2x00_dev *rt2x00dev,
	const unsigned int offset,
	const struct rt2x00_field32 field,
	u32 *reg)
	{
	unsigned int i;

	for (i = 0; i < REGISTER_BUSY_COUNT; i++) {
	rt2x00pci_register_read(rt2x00dev, offset, reg);
	if (!rt2x00_get_field32(*reg, field))
	return 1;
	udelay(REGISTER_BUSY_DELAY);
	}

	ERROR(rt2x00dev, "Indirect register access failed: "
	"offset=0x%.08x, value=0x%.08x\n", offset, *reg);
	*reg = ~0;

	return 0;
	}
	EXPORT_SYMBOL_GPL(rt2x00pci_regbusy_read);

	/*
	* TX data handlers.
	*/
	int rt2x00pci_write_tx_data(struct queue_entry *entry)
	{
	struct rt2x00_dev *rt2x00dev = entry->queue->rt2x00dev;
	struct queue_entry_priv_pci *entry_priv = entry->priv_data;
	struct skb_frame_desc *skbdesc;

	/*
	* This should not happen, we already checked the entry
	* was ours. When the hardware disagrees there has been
	* a queue corruption!
	*/
	if (unlikely(rt2x00dev->ops->lib->get_entry_state(entry))) {
	ERROR(rt2x00dev,
	"Corrupt queue %d, accessing entry which is not ours.\n"
	"Please file bug report to %s.\n",
	entry->queue->qid, DRV_PROJECT);
	return -EINVAL;
	}

	/*
	* Fill in skb descriptor
	*/
	skbdesc = get_skb_frame_desc(entry->skb);
	skbdesc->desc = entry_priv->desc;
	skbdesc->desc_len = entry->queue->desc_size;

	return 0;
	}
	EXPORT_SYMBOL_GPL(rt2x00pci_write_tx_data);

	/*
	* TX/RX data handlers.
	*/
	void rt2x00pci_rxdone(struct rt2x00_dev *rt2x00dev)
	{
	struct data_queue *queue = rt2x00dev->rx;
	struct queue_entry *entry;
	struct queue_entry_priv_pci *entry_priv;
	struct skb_frame_desc *skbdesc;

	while (1) {
	entry = rt2x00queue_get_entry(queue, Q_INDEX);
	entry_priv = entry->priv_data;

	if (rt2x00dev->ops->lib->get_entry_state(entry))
	break;

	/*
	* Fill in desc fields of the skb descriptor
	*/
	skbdesc = get_skb_frame_desc(entry->skb);
	skbdesc->desc = entry_priv->desc;
	skbdesc->desc_len = entry->queue->desc_size;

	/*
	* Send the frame to rt2x00lib for further processing.
	*/
	rt2x00lib_rxdone(rt2x00dev, entry);
	}
	}
	EXPORT_SYMBOL_GPL(rt2x00pci_rxdone);

	/*
	* Device initialization handlers.
	*/
	static int rt2x00pci_alloc_queue_dma(struct rt2x00_dev *rt2x00dev,
	struct data_queue *queue)
	{
	struct queue_entry_priv_pci *entry_priv;
	void *addr;
	dma_addr_t dma;
	unsigned int i;

	/*
	* Allocate DMA memory for descriptor and buffer.
	*/
	addr = dma_alloc_coherent(rt2x00dev->dev,
	queue->limit * queue->desc_size,
	&dma, GFP_KERNEL \| GFP_DMA);
	if (!addr)
	return -ENOMEM;

	memset(addr, 0, queue->limit * queue->desc_size);

	/*
	* Initialize all queue entries to contain valid addresses.
	*/
	for (i = 0; i < queue->limit; i++) {
	entry_priv = queue->entries[i].priv_data;
	entry_priv->desc = addr + i * queue->desc_size;
	entry_priv->desc_dma = dma + i * queue->desc_size;
	}

	return 0;
	}

	static void rt2x00pci_free_queue_dma(struct rt2x00_dev *rt2x00dev,
	struct data_queue *queue)
	{
	struct queue_entry_priv_pci *entry_priv =
	queue->entries[0].priv_data;

	if (entry_priv->desc)
	dma_free_coherent(rt2x00dev->dev,
	queue->limit * queue->desc_size,
	entry_priv->desc, entry_priv->desc_dma);
	entry_priv->desc = NULL;
	}

	int rt2x00pci_initialize(struct rt2x00_dev *rt2x00dev)
	{
	struct pci_dev *pci_dev = to_pci_dev(rt2x00dev->dev);
	struct data_queue *queue;
	int status;

	/*
	* Allocate DMA
	*/
	queue_for_each(rt2x00dev, queue) {
	status = rt2x00pci_alloc_queue_dma(rt2x00dev, queue);
	if (status)
	goto exit;
	}

	/*
	* Register interrupt handler.
	*/
	status = request_irq(pci_dev->irq, rt2x00dev->ops->lib->irq_handler,
	IRQF_SHARED, pci_name(pci_dev), rt2x00dev);
	if (status) {
	ERROR(rt2x00dev, "IRQ %d allocation failed (error %d).\n",
	pci_dev->irq, status);
	goto exit;
	}

	return 0;

	exit:
	queue_for_each(rt2x00dev, queue)
	rt2x00pci_free_queue_dma(rt2x00dev, queue);

	return status;
	}
	EXPORT_SYMBOL_GPL(rt2x00pci_initialize);

	void rt2x00pci_uninitialize(struct rt2x00_dev *rt2x00dev)
	{
	struct data_queue *queue;

	/*
	* Free irq line.
	*/
	free_irq(to_pci_dev(rt2x00dev->dev)->irq, rt2x00dev);

	/*
	* Free DMA
	*/
	queue_for_each(rt2x00dev, queue)
	rt2x00pci_free_queue_dma(rt2x00dev, queue);
	}
	EXPORT_SYMBOL_GPL(rt2x00pci_uninitialize);

	/*
	* PCI driver handlers.
	*/
	static void rt2x00pci_free_reg(struct rt2x00_dev *rt2x00dev)
	{
	kfree(rt2x00dev->rf);
	rt2x00dev->rf = NULL;

	kfree(rt2x00dev->eeprom);
	rt2x00dev->eeprom = NULL;

	if (rt2x00dev->csr.base) {
	iounmap(rt2x00dev->csr.base);
	rt2x00dev->csr.base = NULL;
	}
	}

	static int rt2x00pci_alloc_reg(struct rt2x00_dev *rt2x00dev)
	{
	struct pci_dev *pci_dev = to_pci_dev(rt2x00dev->dev);

	rt2x00dev->csr.base = pci_ioremap_bar(pci_dev, 0);
	if (!rt2x00dev->csr.base)
	goto exit;

	rt2x00dev->eeprom = kzalloc(rt2x00dev->ops->eeprom_size, GFP_KERNEL);
	if (!rt2x00dev->eeprom)
	goto exit;

	rt2x00dev->rf = kzalloc(rt2x00dev->ops->rf_size, GFP_KERNEL);
	if (!rt2x00dev->rf)
	goto exit;

	return 0;

	exit:
	ERROR_PROBE("Failed to allocate registers.\n");

	rt2x00pci_free_reg(rt2x00dev);

	return -ENOMEM;
	}

	int rt2x00pci_probe(struct pci_dev pci_dev, const struct pci_device_id id)
	{
	struct rt2x00_ops ops = (struct rt2x00_ops )id->driver_data;
	struct ieee80211_hw *hw;
	struct rt2x00_dev *rt2x00dev;
	int retval;

	retval = pci_request_regions(pci_dev, pci_name(pci_dev));
	if (retval) {
	ERROR_PROBE("PCI request regions failed.\n");
	return retval;
	}

	retval = pci_enable_device(pci_dev);
	if (retval) {
	ERROR_PROBE("Enable device failed.\n");
	goto exit_release_regions;
	}

	pci_set_master(pci_dev);

	if (pci_set_mwi(pci_dev))
	ERROR_PROBE("MWI not available.\n");

	if (dma_set_mask(&pci_dev->dev, DMA_32BIT_MASK)) {
	ERROR_PROBE("PCI DMA not supported.\n");
	retval = -EIO;
	goto exit_disable_device;
	}

	hw = ieee80211_alloc_hw(sizeof(struct rt2x00_dev), ops->hw);
	if (!hw) {
	ERROR_PROBE("Failed to allocate hardware.\n");
	retval = -ENOMEM;
	goto exit_disable_device;
	}

	pci_set_drvdata(pci_dev, hw);

	rt2x00dev = hw->priv;
	rt2x00dev->dev = &pci_dev->dev;
	rt2x00dev->ops = ops;
	rt2x00dev->hw = hw;

	retval = rt2x00pci_alloc_reg(rt2x00dev);
	if (retval)
	goto exit_free_device;

	retval = rt2x00lib_probe_dev(rt2x00dev);
	if (retval)
	goto exit_free_reg;

	return 0;

	exit_free_reg:
	rt2x00pci_free_reg(rt2x00dev);

	exit_free_device:
	ieee80211_free_hw(hw);

	exit_disable_device:
	if (retval != -EBUSY)
	pci_disable_device(pci_dev);

	exit_release_regions:
	pci_release_regions(pci_dev);

	pci_set_drvdata(pci_dev, NULL);

	return retval;
	}
	EXPORT_SYMBOL_GPL(rt2x00pci_probe);

	void rt2x00pci_remove(struct pci_dev *pci_dev)
	{
	struct ieee80211_hw *hw = pci_get_drvdata(pci_dev);
	struct rt2x00_dev *rt2x00dev = hw->priv;

	/*
	* Free all allocated data.
	*/
	rt2x00lib_remove_dev(rt2x00dev);
	rt2x00pci_free_reg(rt2x00dev);
	ieee80211_free_hw(hw);

	/*
	* Free the PCI device data.
	*/
	pci_set_drvdata(pci_dev, NULL);
	pci_disable_device(pci_dev);
	pci_release_regions(pci_dev);
	}
	EXPORT_SYMBOL_GPL(rt2x00pci_remove);

	#ifdef CONFIG_PM
	int rt2x00pci_suspend(struct pci_dev *pci_dev, pm_message_t state)
	{
	struct ieee80211_hw *hw = pci_get_drvdata(pci_dev);
	struct rt2x00_dev *rt2x00dev = hw->priv;
	int retval;

	retval = rt2x00lib_suspend(rt2x00dev, state);
	if (retval)
	return retval;

	rt2x00pci_free_reg(rt2x00dev);

	pci_save_state(pci_dev);
	pci_disable_device(pci_dev);
	return pci_set_power_state(pci_dev, pci_choose_state(pci_dev, state));
	}
	EXPORT_SYMBOL_GPL(rt2x00pci_suspend);

	int rt2x00pci_resume(struct pci_dev *pci_dev)
	{
	struct ieee80211_hw *hw = pci_get_drvdata(pci_dev);
	struct rt2x00_dev *rt2x00dev = hw->priv;
	int retval;

	if (pci_set_power_state(pci_dev, PCI_D0) \|\|
	pci_enable_device(pci_dev) \|\|
	pci_restore_state(pci_dev)) {
	ERROR(rt2x00dev, "Failed to resume device.\n");
	return -EIO;
	}

	retval = rt2x00pci_alloc_reg(rt2x00dev);
	if (retval)
	return retval;

	retval = rt2x00lib_resume(rt2x00dev);
	if (retval)
	goto exit_free_reg;

	return 0;

	exit_free_reg:
	rt2x00pci_free_reg(rt2x00dev);

	return retval;
	}
	EXPORT_SYMBOL_GPL(rt2x00pci_resume);
	#endif /* CONFIG_PM */

	/*
	* rt2x00pci module information.
	*/
	MODULE_AUTHOR(DRV_PROJECT);
	MODULE_VERSION(DRV_VERSION);
	MODULE_DESCRIPTION("rt2x00 pci library");
	MODULE_LICENSE("GPL");