drivers/net/wireless/ti/wlcore/sdio.c - linux - Git at Google

 /*
  * This file is part of wl1271
  *
  * Copyright (C) 2009-2010 Nokia Corporation
  *
  * Contact: Luciano Coelho <luciano.coelho@nokia.com>
  *
  * This program is free software; you can redistribute it and/or
  * modify it under the terms of the GNU General Public License
  * version 2 as published by the Free Software Foundation.
  *
  * 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., 51 Franklin St, Fifth Floor, Boston, MA
  * 02110-1301 USA
  *
  */

 #include <linux/irq.h>
 #include <linux/module.h>
 #include <linux/vmalloc.h>
 #include <linux/platform_device.h>
 #include <linux/mmc/sdio.h>
 #include <linux/mmc/sdio_func.h>
 #include <linux/mmc/sdio_ids.h>
 #include <linux/mmc/card.h>
 #include <linux/mmc/host.h>
 #include <linux/gpio.h>
 #include <linux/wl12xx.h>
 #include <linux/pm_runtime.h>
 #include <linux/printk.h>

 #include "wlcore.h"
 #include "wl12xx_80211.h"
 #include "io.h"

 #ifndef SDIO_VENDOR_ID_TI
 #define SDIO_VENDOR_ID_TI		0x0097
 #endif

 #ifndef SDIO_DEVICE_ID_TI_WL1271
 #define SDIO_DEVICE_ID_TI_WL1271	0x4076
 #endif

 static bool dump = false;

 struct wl12xx_sdio_glue {
 	struct device *dev;
 	struct platform_device *core;
 };

 static const struct sdio_device_id wl1271_devices[] __devinitconst = {
 	{ SDIO_DEVICE(SDIO_VENDOR_ID_TI, SDIO_DEVICE_ID_TI_WL1271) },
 	{}
 };
 MODULE_DEVICE_TABLE(sdio, wl1271_devices);

 static void wl1271_sdio_set_block_size(struct device *child,
 				       unsigned int blksz)
 {
 	struct wl12xx_sdio_glue *glue = dev_get_drvdata(child->parent);
 	struct sdio_func *func = dev_to_sdio_func(glue->dev);

 	sdio_claim_host(func);
 	sdio_set_block_size(func, blksz);
 	sdio_release_host(func);
 }

 static int __must_check wl12xx_sdio_raw_read(struct device *child, int addr,
 					     void *buf, size_t len, bool fixed)
 {
 	int ret;
 	struct wl12xx_sdio_glue *glue = dev_get_drvdata(child->parent);
 	struct sdio_func *func = dev_to_sdio_func(glue->dev);

 	sdio_claim_host(func);

 	if (unlikely(dump)) {
 		printk(KERN_DEBUG "wlcore_sdio: READ from 0x%04x\n", addr);
 		print_hex_dump(KERN_DEBUG, "wlcore_sdio: READ ",
 				DUMP_PREFIX_OFFSET, 16, 1,
 				buf, len, false);
 	}

 	if (unlikely(addr == HW_ACCESS_ELP_CTRL_REG)) {
 		((u8 *)buf)[0] = sdio_f0_readb(func, addr, &ret);
 		dev_dbg(child->parent, "sdio read 52 addr 0x%x, byte 0x%02x\n",
 			addr, ((u8 *)buf)[0]);
 	} else {
 		if (fixed)
 			ret = sdio_readsb(func, buf, addr, len);
 		else
 			ret = sdio_memcpy_fromio(func, buf, addr, len);

 		dev_dbg(child->parent, "sdio read 53 addr 0x%x, %zu bytes\n",
 			addr, len);
 	}

 	sdio_release_host(func);

 	if (WARN_ON(ret))
 		dev_err(child->parent, "sdio read failed (%d)\n", ret);

 	return ret;
 }

 static int __must_check wl12xx_sdio_raw_write(struct device *child, int addr,
 					      void *buf, size_t len, bool fixed)
 {
 	int ret;
 	struct wl12xx_sdio_glue *glue = dev_get_drvdata(child->parent);
 	struct sdio_func *func = dev_to_sdio_func(glue->dev);

 	sdio_claim_host(func);

 	if (unlikely(dump)) {
 		printk(KERN_DEBUG "wlcore_sdio: WRITE to 0x%04x\n", addr);
 		print_hex_dump(KERN_DEBUG, "wlcore_sdio: WRITE ",
 				DUMP_PREFIX_OFFSET, 16, 1,
 				buf, len, false);
 	}

 	if (unlikely(addr == HW_ACCESS_ELP_CTRL_REG)) {
 		sdio_f0_writeb(func, ((u8 *)buf)[0], addr, &ret);
 		dev_dbg(child->parent, "sdio write 52 addr 0x%x, byte 0x%02x\n",
 			addr, ((u8 *)buf)[0]);
 	} else {
 		dev_dbg(child->parent, "sdio write 53 addr 0x%x, %zu bytes\n",
 			addr, len);

 		if (fixed)
 			ret = sdio_writesb(func, addr, buf, len);
 		else
 			ret = sdio_memcpy_toio(func, addr, buf, len);
 	}

 	sdio_release_host(func);

 	if (WARN_ON(ret))
 		dev_err(child->parent, "sdio write failed (%d)\n", ret);

 	return ret;
 }

 static int wl12xx_sdio_power_on(struct wl12xx_sdio_glue *glue)
 {
 	int ret;
 	struct sdio_func *func = dev_to_sdio_func(glue->dev);
 	struct mmc_card *card = func->card;

 	ret = pm_runtime_get_sync(&card->dev);
 	if (ret) {
 		/*
 		 * Runtime PM might be temporarily disabled, or the device
 		 * might have a positive reference counter. Make sure it is
 		 * really powered on.
 		 */
 		ret = mmc_power_restore_host(card->host);
 		if (ret < 0) {
 			pm_runtime_put_sync(&card->dev);
 			goto out;
 		}
 	}

 	sdio_claim_host(func);
 	sdio_enable_func(func);
 	sdio_release_host(func);

 out:
 	return ret;
 }

 static int wl12xx_sdio_power_off(struct wl12xx_sdio_glue *glue)
 {
 	int ret;
 	struct sdio_func *func = dev_to_sdio_func(glue->dev);
 	struct mmc_card *card = func->card;

 	sdio_claim_host(func);
 	sdio_disable_func(func);
 	sdio_release_host(func);

 	/* Power off the card manually in case it wasn't powered off above */
 	ret = mmc_power_save_host(card->host);
 	if (ret < 0)
 		goto out;

 	/* Let runtime PM know the card is powered off */
 	pm_runtime_put_sync(&card->dev);

 out:
 	return ret;
 }

 static int wl12xx_sdio_set_power(struct device *child, bool enable)
 {
 	struct wl12xx_sdio_glue *glue = dev_get_drvdata(child->parent);

 	if (enable)
 		return wl12xx_sdio_power_on(glue);
 	else
 		return wl12xx_sdio_power_off(glue);
 }

 static struct wl1271_if_operations sdio_ops = {
 	.read		= wl12xx_sdio_raw_read,
 	.write		= wl12xx_sdio_raw_write,
 	.power		= wl12xx_sdio_set_power,
 	.set_block_size = wl1271_sdio_set_block_size,
 };

 static int __devinit wl1271_probe(struct sdio_func *func,
 				  const struct sdio_device_id *id)
 {
 	struct wl12xx_platform_data *wlan_data;
 	struct wl12xx_sdio_glue *glue;
 	struct resource res[1];
 	mmc_pm_flag_t mmcflags;
 	int ret = -ENOMEM;
 	const char *chip_family;

 	/* We are only able to handle the wlan function */
 	if (func->num != 0x02)
 		return -ENODEV;

 	glue = kzalloc(sizeof(*glue), GFP_KERNEL);
 	if (!glue) {
 		dev_err(&func->dev, "can't allocate glue\n");
 		goto out;
 	}

 	glue->dev = &func->dev;

 	/* Grab access to FN0 for ELP reg. */
 	func->card->quirks |= MMC_QUIRK_LENIENT_FN0;

 	/* Use block mode for transferring over one block size of data */
 	func->card->quirks |= MMC_QUIRK_BLKSZ_FOR_BYTE_MODE;

 	wlan_data = wl12xx_get_platform_data();
 	if (IS_ERR(wlan_data)) {
 		ret = PTR_ERR(wlan_data);
 		dev_err(glue->dev, "missing wlan platform data: %d\n", ret);
 		goto out_free_glue;
 	}

 	/* if sdio can keep power while host is suspended, enable wow */
 	mmcflags = sdio_get_host_pm_caps(func);
 	dev_dbg(glue->dev, "sdio PM caps = 0x%x\n", mmcflags);

 	if (mmcflags & MMC_PM_KEEP_POWER)
 		wlan_data->pwr_in_suspend = true;

 	wlan_data->ops = &sdio_ops;

 	sdio_set_drvdata(func, glue);

 	/* Tell PM core that we don't need the card to be powered now */
 	pm_runtime_put_noidle(&func->dev);

 	/*
 	 * Due to a hardware bug, we can't differentiate wl18xx from
 	 * wl12xx, because both report the same device ID.  The only
 	 * way to differentiate is by checking the SDIO revision,
 	 * which is 3.00 on the wl18xx chips.
 	 */
 	if (func->card->cccr.sdio_vsn == SDIO_SDIO_REV_3_00)
 		chip_family = "wl18xx";
 	else
 		chip_family = "wl12xx";

 	glue->core = platform_device_alloc(chip_family, -1);
 	if (!glue->core) {
 		dev_err(glue->dev, "can't allocate platform_device");
 		ret = -ENOMEM;
 		goto out_free_glue;
 	}

 	glue->core->dev.parent = &func->dev;

 	memset(res, 0x00, sizeof(res));

 	res[0].start = wlan_data->irq;
 	res[0].flags = IORESOURCE_IRQ;
 	res[0].name = "irq";

 	ret = platform_device_add_resources(glue->core, res, ARRAY_SIZE(res));
 	if (ret) {
 		dev_err(glue->dev, "can't add resources\n");
 		goto out_dev_put;
 	}

 	ret = platform_device_add_data(glue->core, wlan_data,
 				       sizeof(*wlan_data));
 	if (ret) {
 		dev_err(glue->dev, "can't add platform data\n");
 		goto out_dev_put;
 	}

 	ret = platform_device_add(glue->core);
 	if (ret) {
 		dev_err(glue->dev, "can't add platform device\n");
 		goto out_dev_put;
 	}
 	return 0;

 out_dev_put:
 	platform_device_put(glue->core);

 out_free_glue:
 	kfree(glue);

 out:
 	return ret;
 }

 static void __devexit wl1271_remove(struct sdio_func *func)
 {
 	struct wl12xx_sdio_glue *glue = sdio_get_drvdata(func);

 	/* Undo decrement done above in wl1271_probe */
 	pm_runtime_get_noresume(&func->dev);

 	platform_device_del(glue->core);
 	platform_device_put(glue->core);
 	kfree(glue);
 }

 #ifdef CONFIG_PM
 static int wl1271_suspend(struct device *dev)
 {
 	/* Tell MMC/SDIO core it's OK to power down the card
 	 * (if it isn't already), but not to remove it completely */
 	struct sdio_func *func = dev_to_sdio_func(dev);
 	struct wl12xx_sdio_glue *glue = sdio_get_drvdata(func);
 	struct wl1271 *wl = platform_get_drvdata(glue->core);
 	mmc_pm_flag_t sdio_flags;
 	int ret = 0;

 	dev_dbg(dev, "wl1271 suspend. wow_enabled: %d\n",
 		wl->wow_enabled);

 	/* check whether sdio should keep power */
 	if (wl->wow_enabled) {
 		sdio_flags = sdio_get_host_pm_caps(func);

 		if (!(sdio_flags & MMC_PM_KEEP_POWER)) {
 			dev_err(dev, "can't keep power while host "
 				     "is suspended\n");
 			ret = -EINVAL;
 			goto out;
 		}

 		/* keep power while host suspended */
 		ret = sdio_set_host_pm_flags(func, MMC_PM_KEEP_POWER);
 		if (ret) {
 			dev_err(dev, "error while trying to keep power\n");
 			goto out;
 		}
 	}
 out:
 	return ret;
 }

 static int wl1271_resume(struct device *dev)
 {
 	dev_dbg(dev, "wl1271 resume\n");

 	return 0;
 }

 static const struct dev_pm_ops wl1271_sdio_pm_ops = {
 	.suspend	= wl1271_suspend,
 	.resume		= wl1271_resume,
 };
 #endif

 static struct sdio_driver wl1271_sdio_driver = {
 	.name		= "wl1271_sdio",
 	.id_table	= wl1271_devices,
 	.probe		= wl1271_probe,
 	.remove		= __devexit_p(wl1271_remove),
 #ifdef CONFIG_PM
 	.drv = {
 		.pm = &wl1271_sdio_pm_ops,
 	},
 #endif
 };

 static int __init wl1271_init(void)
 {
 	return sdio_register_driver(&wl1271_sdio_driver);
 }

 static void __exit wl1271_exit(void)
 {
 	sdio_unregister_driver(&wl1271_sdio_driver);
 }

 module_init(wl1271_init);
 module_exit(wl1271_exit);

 module_param(dump, bool, S_IRUSR | S_IWUSR);
 MODULE_PARM_DESC(dump, "Enable sdio read/write dumps.");

 MODULE_LICENSE("GPL");
 MODULE_AUTHOR("Luciano Coelho <coelho@ti.com>");
 MODULE_AUTHOR("Juuso Oikarinen <juuso.oikarinen@nokia.com>");
	/*
	* This file is part of wl1271
	*
	* Copyright (C) 2009-2010 Nokia Corporation
	*
	* Contact: Luciano Coelho <luciano.coelho@nokia.com>
	*
	* This program is free software; you can redistribute it and/or
	* modify it under the terms of the GNU General Public License
	* version 2 as published by the Free Software Foundation.
	*
	* 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., 51 Franklin St, Fifth Floor, Boston, MA
	* 02110-1301 USA
	*
	*/

	#include <linux/irq.h>
	#include <linux/module.h>
	#include <linux/vmalloc.h>
	#include <linux/platform_device.h>
	#include <linux/mmc/sdio.h>
	#include <linux/mmc/sdio_func.h>
	#include <linux/mmc/sdio_ids.h>
	#include <linux/mmc/card.h>
	#include <linux/mmc/host.h>
	#include <linux/gpio.h>
	#include <linux/wl12xx.h>
	#include <linux/pm_runtime.h>
	#include <linux/printk.h>

	#include "wlcore.h"
	#include "wl12xx_80211.h"
	#include "io.h"

	#ifndef SDIO_VENDOR_ID_TI
	#define SDIO_VENDOR_ID_TI 0x0097
	#endif

	#ifndef SDIO_DEVICE_ID_TI_WL1271
	#define SDIO_DEVICE_ID_TI_WL1271 0x4076
	#endif

	static bool dump = false;

	struct wl12xx_sdio_glue {
	struct device *dev;
	struct platform_device *core;
	};

	static const struct sdio_device_id wl1271_devices[] __devinitconst = {
	{ SDIO_DEVICE(SDIO_VENDOR_ID_TI, SDIO_DEVICE_ID_TI_WL1271) },
	{}
	};
	MODULE_DEVICE_TABLE(sdio, wl1271_devices);

	static void wl1271_sdio_set_block_size(struct device *child,
	unsigned int blksz)
	{
	struct wl12xx_sdio_glue *glue = dev_get_drvdata(child->parent);
	struct sdio_func *func = dev_to_sdio_func(glue->dev);

	sdio_claim_host(func);
	sdio_set_block_size(func, blksz);
	sdio_release_host(func);
	}

	static int __must_check wl12xx_sdio_raw_read(struct device *child, int addr,
	void *buf, size_t len, bool fixed)
	{
	int ret;
	struct wl12xx_sdio_glue *glue = dev_get_drvdata(child->parent);
	struct sdio_func *func = dev_to_sdio_func(glue->dev);

	sdio_claim_host(func);

	if (unlikely(dump)) {
	printk(KERN_DEBUG "wlcore_sdio: READ from 0x%04x\n", addr);
	print_hex_dump(KERN_DEBUG, "wlcore_sdio: READ ",
	DUMP_PREFIX_OFFSET, 16, 1,
	buf, len, false);
	}

	if (unlikely(addr == HW_ACCESS_ELP_CTRL_REG)) {
	((u8 *)buf)[0] = sdio_f0_readb(func, addr, &ret);
	dev_dbg(child->parent, "sdio read 52 addr 0x%x, byte 0x%02x\n",
	addr, ((u8 *)buf)[0]);
	} else {
	if (fixed)
	ret = sdio_readsb(func, buf, addr, len);
	else
	ret = sdio_memcpy_fromio(func, buf, addr, len);

	dev_dbg(child->parent, "sdio read 53 addr 0x%x, %zu bytes\n",
	addr, len);
	}

	sdio_release_host(func);

	if (WARN_ON(ret))
	dev_err(child->parent, "sdio read failed (%d)\n", ret);

	return ret;
	}

	static int __must_check wl12xx_sdio_raw_write(struct device *child, int addr,
	void *buf, size_t len, bool fixed)
	{
	int ret;
	struct wl12xx_sdio_glue *glue = dev_get_drvdata(child->parent);
	struct sdio_func *func = dev_to_sdio_func(glue->dev);

	sdio_claim_host(func);

	if (unlikely(dump)) {
	printk(KERN_DEBUG "wlcore_sdio: WRITE to 0x%04x\n", addr);
	print_hex_dump(KERN_DEBUG, "wlcore_sdio: WRITE ",
	DUMP_PREFIX_OFFSET, 16, 1,
	buf, len, false);
	}

	if (unlikely(addr == HW_ACCESS_ELP_CTRL_REG)) {
	sdio_f0_writeb(func, ((u8 *)buf)[0], addr, &ret);
	dev_dbg(child->parent, "sdio write 52 addr 0x%x, byte 0x%02x\n",
	addr, ((u8 *)buf)[0]);
	} else {
	dev_dbg(child->parent, "sdio write 53 addr 0x%x, %zu bytes\n",
	addr, len);

	if (fixed)
	ret = sdio_writesb(func, addr, buf, len);
	else
	ret = sdio_memcpy_toio(func, addr, buf, len);
	}

	sdio_release_host(func);

	if (WARN_ON(ret))
	dev_err(child->parent, "sdio write failed (%d)\n", ret);

	return ret;
	}

	static int wl12xx_sdio_power_on(struct wl12xx_sdio_glue *glue)
	{
	int ret;
	struct sdio_func *func = dev_to_sdio_func(glue->dev);
	struct mmc_card *card = func->card;

	ret = pm_runtime_get_sync(&card->dev);
	if (ret) {
	/*
	* Runtime PM might be temporarily disabled, or the device
	* might have a positive reference counter. Make sure it is
	* really powered on.
	*/
	ret = mmc_power_restore_host(card->host);
	if (ret < 0) {
	pm_runtime_put_sync(&card->dev);
	goto out;
	}
	}

	sdio_claim_host(func);
	sdio_enable_func(func);
	sdio_release_host(func);

	out:
	return ret;
	}

	static int wl12xx_sdio_power_off(struct wl12xx_sdio_glue *glue)
	{
	int ret;
	struct sdio_func *func = dev_to_sdio_func(glue->dev);
	struct mmc_card *card = func->card;

	sdio_claim_host(func);
	sdio_disable_func(func);
	sdio_release_host(func);

	/* Power off the card manually in case it wasn't powered off above */
	ret = mmc_power_save_host(card->host);
	if (ret < 0)
	goto out;

	/* Let runtime PM know the card is powered off */
	pm_runtime_put_sync(&card->dev);

	out:
	return ret;
	}

	static int wl12xx_sdio_set_power(struct device *child, bool enable)
	{
	struct wl12xx_sdio_glue *glue = dev_get_drvdata(child->parent);

	if (enable)
	return wl12xx_sdio_power_on(glue);
	else
	return wl12xx_sdio_power_off(glue);
	}

	static struct wl1271_if_operations sdio_ops = {
	.read = wl12xx_sdio_raw_read,
	.write = wl12xx_sdio_raw_write,
	.power = wl12xx_sdio_set_power,
	.set_block_size = wl1271_sdio_set_block_size,
	};

	static int __devinit wl1271_probe(struct sdio_func *func,
	const struct sdio_device_id *id)
	{
	struct wl12xx_platform_data *wlan_data;
	struct wl12xx_sdio_glue *glue;
	struct resource res[1];
	mmc_pm_flag_t mmcflags;
	int ret = -ENOMEM;
	const char *chip_family;

	/* We are only able to handle the wlan function */
	if (func->num != 0x02)
	return -ENODEV;

	glue = kzalloc(sizeof(*glue), GFP_KERNEL);
	if (!glue) {
	dev_err(&func->dev, "can't allocate glue\n");
	goto out;
	}

	glue->dev = &func->dev;

	/* Grab access to FN0 for ELP reg. */
	func->card->quirks \|= MMC_QUIRK_LENIENT_FN0;

	/* Use block mode for transferring over one block size of data */
	func->card->quirks \|= MMC_QUIRK_BLKSZ_FOR_BYTE_MODE;

	wlan_data = wl12xx_get_platform_data();
	if (IS_ERR(wlan_data)) {
	ret = PTR_ERR(wlan_data);
	dev_err(glue->dev, "missing wlan platform data: %d\n", ret);
	goto out_free_glue;
	}

	/* if sdio can keep power while host is suspended, enable wow */
	mmcflags = sdio_get_host_pm_caps(func);
	dev_dbg(glue->dev, "sdio PM caps = 0x%x\n", mmcflags);

	if (mmcflags & MMC_PM_KEEP_POWER)
	wlan_data->pwr_in_suspend = true;

	wlan_data->ops = &sdio_ops;

	sdio_set_drvdata(func, glue);

	/* Tell PM core that we don't need the card to be powered now */
	pm_runtime_put_noidle(&func->dev);

	/*
	* Due to a hardware bug, we can't differentiate wl18xx from
	* wl12xx, because both report the same device ID. The only
	* way to differentiate is by checking the SDIO revision,
	* which is 3.00 on the wl18xx chips.
	*/
	if (func->card->cccr.sdio_vsn == SDIO_SDIO_REV_3_00)
	chip_family = "wl18xx";
	else
	chip_family = "wl12xx";

	glue->core = platform_device_alloc(chip_family, -1);
	if (!glue->core) {
	dev_err(glue->dev, "can't allocate platform_device");
	ret = -ENOMEM;
	goto out_free_glue;
	}

	glue->core->dev.parent = &func->dev;

	memset(res, 0x00, sizeof(res));

	res[0].start = wlan_data->irq;
	res[0].flags = IORESOURCE_IRQ;
	res[0].name = "irq";

	ret = platform_device_add_resources(glue->core, res, ARRAY_SIZE(res));
	if (ret) {
	dev_err(glue->dev, "can't add resources\n");
	goto out_dev_put;
	}

	ret = platform_device_add_data(glue->core, wlan_data,
	sizeof(*wlan_data));
	if (ret) {
	dev_err(glue->dev, "can't add platform data\n");
	goto out_dev_put;
	}

	ret = platform_device_add(glue->core);
	if (ret) {
	dev_err(glue->dev, "can't add platform device\n");
	goto out_dev_put;
	}
	return 0;

	out_dev_put:
	platform_device_put(glue->core);

	out_free_glue:
	kfree(glue);

	out:
	return ret;
	}

	static void __devexit wl1271_remove(struct sdio_func *func)
	{
	struct wl12xx_sdio_glue *glue = sdio_get_drvdata(func);

	/* Undo decrement done above in wl1271_probe */
	pm_runtime_get_noresume(&func->dev);

	platform_device_del(glue->core);
	platform_device_put(glue->core);
	kfree(glue);
	}

	#ifdef CONFIG_PM
	static int wl1271_suspend(struct device *dev)
	{
	/* Tell MMC/SDIO core it's OK to power down the card
	* (if it isn't already), but not to remove it completely */
	struct sdio_func *func = dev_to_sdio_func(dev);
	struct wl12xx_sdio_glue *glue = sdio_get_drvdata(func);
	struct wl1271 *wl = platform_get_drvdata(glue->core);
	mmc_pm_flag_t sdio_flags;
	int ret = 0;

	dev_dbg(dev, "wl1271 suspend. wow_enabled: %d\n",
	wl->wow_enabled);

	/* check whether sdio should keep power */
	if (wl->wow_enabled) {
	sdio_flags = sdio_get_host_pm_caps(func);

	if (!(sdio_flags & MMC_PM_KEEP_POWER)) {
	dev_err(dev, "can't keep power while host "
	"is suspended\n");
	ret = -EINVAL;
	goto out;
	}

	/* keep power while host suspended */
	ret = sdio_set_host_pm_flags(func, MMC_PM_KEEP_POWER);
	if (ret) {
	dev_err(dev, "error while trying to keep power\n");
	goto out;
	}
	}
	out:
	return ret;
	}

	static int wl1271_resume(struct device *dev)
	{
	dev_dbg(dev, "wl1271 resume\n");

	return 0;
	}

	static const struct dev_pm_ops wl1271_sdio_pm_ops = {
	.suspend = wl1271_suspend,
	.resume = wl1271_resume,
	};
	#endif

	static struct sdio_driver wl1271_sdio_driver = {
	.name = "wl1271_sdio",
	.id_table = wl1271_devices,
	.probe = wl1271_probe,
	.remove = __devexit_p(wl1271_remove),
	#ifdef CONFIG_PM
	.drv = {
	.pm = &wl1271_sdio_pm_ops,
	},
	#endif
	};

	static int __init wl1271_init(void)
	{
	return sdio_register_driver(&wl1271_sdio_driver);
	}

	static void __exit wl1271_exit(void)
	{
	sdio_unregister_driver(&wl1271_sdio_driver);
	}

	module_init(wl1271_init);
	module_exit(wl1271_exit);

	module_param(dump, bool, S_IRUSR \| S_IWUSR);
	MODULE_PARM_DESC(dump, "Enable sdio read/write dumps.");

	MODULE_LICENSE("GPL");
	MODULE_AUTHOR("Luciano Coelho <coelho@ti.com>");
	MODULE_AUTHOR("Juuso Oikarinen <juuso.oikarinen@nokia.com>");