net: libertas sdio driver

Add driver for Marvell's Libertas 8385 and 8686 wifi chips.

Signed-off-by: Pierre Ossman <drzeus@drzeus.cx>
Acked-by: Dan Williams <dcbw@redhat.com>

1 files changed, 1079 insertions, 0 deletions

diff --git a/drivers/net/wireless/libertas/if_sdio.c b/drivers/net/wireless/libertas/if_sdio.c
new file mode 100644
index 00000000000..a8e17076e7d
--- /dev/null
+++ b/drivers/net/wireless/libertas/if_sdio.c
@@ -0,0 +1,1079 @@
+/*
+ *  linux/drivers/net/wireless/libertas/if_sdio.c
+ *
+ *  Copyright 2007 Pierre Ossman
+ *
+ * Inspired by if_cs.c, Copyright 2007 Holger Schurig
+ *
+ * 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 hardware has more or less no CMD53 support, so all registers
+ * must be accessed using sdio_readb()/sdio_writeb().
+ *
+ * Transfers must be in one transaction or the firmware goes bonkers.
+ * This means that the transfer must either be small enough to do a
+ * byte based transfer or it must be padded to a multiple of the
+ * current block size.
+ *
+ * As SDIO is still new to the kernel, it is unfortunately common with
+ * bugs in the host controllers related to that. One such bug is that 
+ * controllers cannot do transfers that aren't a multiple of 4 bytes.
+ * If you don't have time to fix the host controller driver, you can
+ * work around the problem by modifying if_sdio_host_to_card() and
+ * if_sdio_card_to_host() to pad the data.
+ */
+
+#include <linux/moduleparam.h>
+#include <linux/firmware.h>
+#include <linux/netdevice.h>
+#include <linux/delay.h>
+#include <linux/mmc/card.h>
+#include <linux/mmc/sdio_func.h>
+#include <linux/mmc/sdio_ids.h>
+
+#include "host.h"
+#include "decl.h"
+#include "defs.h"
+#include "dev.h"
+#include "if_sdio.h"
+
+static char *libertas_helper_name = NULL;
+module_param_named(helper_name, libertas_helper_name, charp, 0644);
+
+static char *libertas_fw_name = NULL;
+module_param_named(fw_name, libertas_fw_name, charp, 0644);
+
+static const struct sdio_device_id if_sdio_ids[] = {
+	{ SDIO_DEVICE(SDIO_VENDOR_ID_MARVELL, SDIO_DEVICE_ID_MARVELL_LIBERTAS) },
+	{ /* end: all zeroes */						},
+};
+
+MODULE_DEVICE_TABLE(sdio, if_sdio_ids);
+
+struct if_sdio_model {
+	int model;
+	const char *helper;
+	const char *firmware;
+};
+
+static struct if_sdio_model if_sdio_models[] = {
+	{
+		/* 8385 */
+		.model = 0x04,
+		.helper = "sd8385_helper.bin",
+		.firmware = "sd8385.bin",
+	},
+	{
+		/* 8686 */
+		.model = 0x0B,
+		.helper = "sd8686_helper.bin",
+		.firmware = "sd8686.bin",
+	},
+};
+
+struct if_sdio_packet {
+	struct if_sdio_packet	*next;
+	u16			nb;
+	u8			buffer[0] __attribute__((aligned(4)));
+};
+
+struct if_sdio_card {
+	struct sdio_func	*func;
+	wlan_private		*priv;
+
+	int			model;
+	unsigned long		ioport;
+
+	const char		*helper;
+	const char		*firmware;
+
+	u8			buffer[65536];
+	u8			int_cause;
+	u32			event;
+
+	spinlock_t		lock;
+	struct if_sdio_packet	*packets;
+	struct work_struct	packet_worker;
+};
+
+/********************************************************************/
+/* I/O                                                              */
+/********************************************************************/
+
+static u16 if_sdio_read_scratch(struct if_sdio_card *card, int *err)
+{
+	int ret, reg;
+	u16 scratch;
+
+	if (card->model == 0x04)
+		reg = IF_SDIO_SCRATCH_OLD;
+	else
+		reg = IF_SDIO_SCRATCH;
+
+	scratch = sdio_readb(card->func, reg, &ret);
+	if (!ret)
+		scratch |= sdio_readb(card->func, reg + 1, &ret) << 8;
+
+	if (err)
+		*err = ret;
+
+	if (ret)
+		return 0xffff;
+
+	return scratch;
+}
+
+static int if_sdio_handle_cmd(struct if_sdio_card *card,
+		u8 *buffer, unsigned size)
+{
+	int ret;
+	unsigned long flags;
+
+	lbs_deb_enter(LBS_DEB_SDIO);
+
+	spin_lock_irqsave(&card->priv->adapter->driver_lock, flags);
+
+	if (!card->priv->adapter->cur_cmd) {
+		lbs_deb_sdio("discarding spurious response\n");
+		ret = 0;
+		goto out;
+	}
+
+	if (size > MRVDRV_SIZE_OF_CMD_BUFFER) {
+		lbs_deb_sdio("response packet too large (%d bytes)\n",
+			(int)size);
+		ret = -E2BIG;
+		goto out;
+	}
+
+	memcpy(card->priv->adapter->cur_cmd->bufvirtualaddr, buffer, size);
+	card->priv->upld_len = size;
+
+	card->int_cause |= MRVDRV_CMD_UPLD_RDY;
+
+	libertas_interrupt(card->priv->dev);
+
+	ret = 0;
+
+out:
+	spin_unlock_irqrestore(&card->priv->adapter->driver_lock, flags);
+
+	lbs_deb_leave_args(LBS_DEB_SDIO, "ret %d", ret);
+
+	return ret;
+}
+
+static int if_sdio_handle_data(struct if_sdio_card *card,
+		u8 *buffer, unsigned size)
+{
+	int ret;
+	struct sk_buff *skb;
+	char *data;
+
+	lbs_deb_enter(LBS_DEB_SDIO);
+
+	if (size > MRVDRV_ETH_RX_PACKET_BUFFER_SIZE) {
+		lbs_deb_sdio("response packet too large (%d bytes)\n",
+			(int)size);
+		ret = -E2BIG;
+		goto out;
+	}
+
+	skb = dev_alloc_skb(MRVDRV_ETH_RX_PACKET_BUFFER_SIZE);
+	if (!skb) {
+		ret = -ENOMEM;
+		goto out;
+	}
+
+	data = skb_put(skb, size);
+
+	memcpy(data, buffer, size);
+
+	libertas_process_rxed_packet(card->priv, skb);
+
+	ret = 0;
+
+out:
+	lbs_deb_leave_args(LBS_DEB_SDIO, "ret %d", ret);
+
+	return ret;
+}
+
+static int if_sdio_handle_event(struct if_sdio_card *card,
+		u8 *buffer, unsigned size)
+{
+	int ret;
+	unsigned long flags;
+	u32 event;
+
+	lbs_deb_enter(LBS_DEB_SDIO);
+
+	if (card->model == 0x04) {
+		event = sdio_readb(card->func, IF_SDIO_EVENT, &ret);
+		if (ret)
+			goto out;
+	} else {
+		if (size < 4) {
+			lbs_deb_sdio("event packet too small (%d bytes)\n",
+				(int)size);
+			ret = -EINVAL;
+			goto out;
+		}
+		event = buffer[3] << 24;
+		event |= buffer[2] << 16;
+		event |= buffer[1] << 8;
+		event |= buffer[0] << 0;
+		event <<= SBI_EVENT_CAUSE_SHIFT;
+	}
+
+	spin_lock_irqsave(&card->priv->adapter->driver_lock, flags);
+
+	card->event = event;
+	card->int_cause |= MRVDRV_CARDEVENT;
+
+	libertas_interrupt(card->priv->dev);
+
+	spin_unlock_irqrestore(&card->priv->adapter->driver_lock, flags);
+
+	ret = 0;
+
+out:
+	lbs_deb_leave_args(LBS_DEB_SDIO, "ret %d", ret);
+
+	return ret;
+}
+
+static int if_sdio_card_to_host(struct if_sdio_card *card)
+{
+	int ret;
+	u8 status;
+	u16 size, type, chunk;
+	unsigned long timeout;
+
+	lbs_deb_enter(LBS_DEB_SDIO);
+
+	size = if_sdio_read_scratch(card, &ret);
+	if (ret)
+		goto out;
+
+	if (size < 4) {
+		lbs_deb_sdio("invalid packet size (%d bytes) from firmware\n",
+			(int)size);
+		ret = -EINVAL;
+		goto out;
+	}
+
+	timeout = jiffies + HZ;
+	while (1) {
+		status = sdio_readb(card->func, IF_SDIO_STATUS, &ret);
+		if (ret)
+			goto out;
+		if (status & IF_SDIO_IO_RDY)
+			break;
+		if (time_after(jiffies, timeout)) {
+			ret = -ETIMEDOUT;
+			goto out;
+		}
+		mdelay(1);
+	}
+
+	/*
+	 * The transfer must be in one transaction or the firmware
+	 * goes suicidal.
+	 */
+	chunk = size;
+	if ((chunk > card->func->cur_blksize) || (chunk > 512)) {
+		chunk = (chunk + card->func->cur_blksize - 1) /
+			card->func->cur_blksize * card->func->cur_blksize;
+	}
+
+	ret = sdio_readsb(card->func, card->buffer, card->ioport, chunk);
+	if (ret)
+		goto out;
+
+	chunk = card->buffer[0] | (card->buffer[1] << 8);
+	type = card->buffer[2] | (card->buffer[3] << 8);
+
+	lbs_deb_sdio("packet of type %d and size %d bytes\n",
+		(int)type, (int)chunk);
+
+	if (chunk > size) {
+		lbs_deb_sdio("packet fragment (%d > %d)\n",
+			(int)chunk, (int)size);
+		ret = -EINVAL;
+		goto out;
+	}
+
+	if (chunk < size) {
+		lbs_deb_sdio("packet fragment (%d < %d)\n",
+			(int)chunk, (int)size);
+	}
+
+	switch (type) {
+	case MVMS_CMD:
+		ret = if_sdio_handle_cmd(card, card->buffer + 4, chunk - 4);
+		if (ret)
+			goto out;
+		break;
+	case MVMS_DAT:
+		ret = if_sdio_handle_data(card, card->buffer + 4, chunk - 4);
+		if (ret)
+			goto out;
+		break;
+	case MVMS_EVENT:
+		ret = if_sdio_handle_event(card, card->buffer + 4, chunk - 4);
+		if (ret)
+			goto out;
+		break;
+	default:
+		lbs_deb_sdio("invalid type (%d) from firmware\n",
+				(int)type);
+		ret = -EINVAL;
+		goto out;
+	}
+
+out:
+	if (ret)
+		lbs_pr_err("problem fetching packet from firmware\n");
+
+	lbs_deb_leave_args(LBS_DEB_SDIO, "ret %d", ret);
+
+	return ret;
+}
+
+static void if_sdio_host_to_card_worker(struct work_struct *work)
+{
+	struct if_sdio_card *card;
+	struct if_sdio_packet *packet;
+	unsigned long timeout;
+	u8 status;
+	int ret;
+	unsigned long flags;
+
+	lbs_deb_enter(LBS_DEB_SDIO);
+
+	card = container_of(work, struct if_sdio_card, packet_worker);
+
+	while (1) {
+		spin_lock_irqsave(&card->lock, flags);
+		packet = card->packets;
+		if (packet)
+			card->packets = packet->next;
+		spin_unlock_irqrestore(&card->lock, flags);
+
+		if (!packet)
+			break;
+
+		sdio_claim_host(card->func);
+
+		timeout = jiffies + HZ;
+		while (1) {
+			status = sdio_readb(card->func, IF_SDIO_STATUS, &ret);
+			if (ret)
+				goto release;
+			if (status & IF_SDIO_IO_RDY)
+				break;
+			if (time_after(jiffies, timeout)) {
+				ret = -ETIMEDOUT;
+				goto release;
+			}
+			mdelay(1);
+		}
+
+		ret = sdio_writesb(card->func, card->ioport,
+				packet->buffer, packet->nb);
+		if (ret)
+			goto release;
+release:
+		sdio_release_host(card->func);
+
+		kfree(packet);
+	}
+
+	lbs_deb_leave(LBS_DEB_SDIO);
+}
+
+/********************************************************************/
+/* Firmware                                                         */
+/********************************************************************/
+
+static int if_sdio_prog_helper(struct if_sdio_card *card)
+{
+	int ret;
+	u8 status;
+	const struct firmware *fw;
+	unsigned long timeout;
+	u8 *chunk_buffer;
+	u32 chunk_size;
+	u8 *firmware;
+	size_t size;
+
+	lbs_deb_enter(LBS_DEB_SDIO);
+
+	ret = request_firmware(&fw, card->helper, &card->func->dev);
+	if (ret) {
+		lbs_pr_err("can't load helper firmware\n");
+		goto out;
+	}
+
+	chunk_buffer = kzalloc(64, GFP_KERNEL);
+	if (!chunk_buffer) {
+		ret = -ENOMEM;
+		goto release_fw;
+	}
+
+	sdio_claim_host(card->func);
+
+	ret = sdio_set_block_size(card->func, 32);
+	if (ret)
+		goto release;
+
+	firmware = fw->data;
+	size = fw->size;
+
+	while (size) {
+		timeout = jiffies + HZ;
+		while (1) {
+			status = sdio_readb(card->func, IF_SDIO_STATUS, &ret);
+			if (ret)
+				goto release;
+			if ((status & IF_SDIO_IO_RDY) &&
+					(status & IF_SDIO_DL_RDY))
+				break;
+			if (time_after(jiffies, timeout)) {
+				ret = -ETIMEDOUT;
+				goto release;
+			}
+			mdelay(1);
+		}
+
+		chunk_size = min(size, (size_t)60);
+
+		*((u32*)chunk_buffer) = cpu_to_le32(chunk_size);
+		memcpy(chunk_buffer + 4, firmware, chunk_size);
+/*
+		lbs_deb_sdio("sending %d bytes chunk\n", chunk_size);
+*/
+		ret = sdio_writesb(card->func, card->ioport,
+				chunk_buffer, 64);
+		if (ret)
+			goto release;
+
+		firmware += chunk_size;
+		size -= chunk_size;
+	}
+
+	/* an empty block marks the end of the transfer */
+	memset(chunk_buffer, 0, 4);
+	ret = sdio_writesb(card->func, card->ioport, chunk_buffer, 64);
+	if (ret)
+		goto release;
+
+	lbs_deb_sdio("waiting for helper to boot...\n");
+
+	/* wait for the helper to boot by looking at the size register */
+	timeout = jiffies + HZ;
+	while (1) {
+		u16 req_size;
+
+		req_size = sdio_readb(card->func, IF_SDIO_RD_BASE, &ret);
+		if (ret)
+			goto release;
+
+		req_size |= sdio_readb(card->func, IF_SDIO_RD_BASE + 1, &ret) << 8;
+		if (ret)
+			goto release;
+
+		if (req_size != 0)
+			break;
+
+		if (time_after(jiffies, timeout)) {
+			ret = -ETIMEDOUT;
+			goto release;
+		}
+
+		msleep(10);
+	}
+
+	ret = 0;
+
+release:
+	sdio_set_block_size(card->func, 0);
+	sdio_release_host(card->func);
+	kfree(chunk_buffer);
+release_fw:
+	release_firmware(fw);
+
+out:
+	if (ret)
+		lbs_pr_err("failed to load helper firmware\n");
+
+	lbs_deb_leave_args(LBS_DEB_SDIO, "ret %d", ret);
+
+	return ret;
+}
+
+static int if_sdio_prog_real(struct if_sdio_card *card)
+{
+	int ret;
+	u8 status;
+	const struct firmware *fw;
+	unsigned long timeout;
+	u8 *chunk_buffer;
+	u32 chunk_size;
+	u8 *firmware;
+	size_t size, req_size;
+
+	lbs_deb_enter(LBS_DEB_SDIO);
+
+	ret = request_firmware(&fw, card->firmware, &card->func->dev);
+	if (ret) {
+		lbs_pr_err("can't load firmware\n");
+		goto out;
+	}
+
+	chunk_buffer = kzalloc(512, GFP_KERNEL);
+	if (!chunk_buffer) {
+		ret = -ENOMEM;
+		goto release_fw;
+	}
+
+	sdio_claim_host(card->func);
+
+	ret = sdio_set_block_size(card->func, 32);
+	if (ret)
+		goto release;
+
+	firmware = fw->data;
+	size = fw->size;
+
+	while (size) {
+		timeout = jiffies + HZ;
+		while (1) {
+			status = sdio_readb(card->func, IF_SDIO_STATUS, &ret);
+			if (ret)
+				goto release;
+			if ((status & IF_SDIO_IO_RDY) &&
+					(status & IF_SDIO_DL_RDY))
+				break;
+			if (time_after(jiffies, timeout)) {
+				ret = -ETIMEDOUT;
+				goto release;
+			}
+			mdelay(1);
+		}
+
+		req_size = sdio_readb(card->func, IF_SDIO_RD_BASE, &ret);
+		if (ret)
+			goto release;
+
+		req_size |= sdio_readb(card->func, IF_SDIO_RD_BASE + 1, &ret) << 8;
+		if (ret)
+			goto release;
+/*
+		lbs_deb_sdio("firmware wants %d bytes\n", (int)req_size);
+*/
+		if (req_size == 0) {
+			lbs_deb_sdio("firmware helper gave up early\n");
+			ret = -EIO;
+			goto release;
+		}
+
+		if (req_size & 0x01) {
+			lbs_deb_sdio("firmware helper signalled error\n");
+			ret = -EIO;
+			goto release;
+		}
+
+		if (req_size > size)
+			req_size = size;
+
+		while (req_size) {
+			chunk_size = min(req_size, (size_t)512);
+
+			memcpy(chunk_buffer, firmware, chunk_size);
+/*
+			lbs_deb_sdio("sending %d bytes (%d bytes) chunk\n",
+				chunk_size, (chunk_size + 31) / 32 * 32);
+*/
+			ret = sdio_writesb(card->func, card->ioport,
+				chunk_buffer, (chunk_size + 31) / 32 * 32);
+			if (ret)
+				goto release;
+
+			firmware += chunk_size;
+			size -= chunk_size;
+			req_size -= chunk_size;
+		}
+	}
+
+	ret = 0;
+
+	lbs_deb_sdio("waiting for firmware to boot...\n");
+
+	/* wait for the firmware to boot */
+	timeout = jiffies + HZ;
+	while (1) {
+		u16 scratch;
+
+		scratch = if_sdio_read_scratch(card, &ret);
+		if (ret)
+			goto release;
+
+		if (scratch == IF_SDIO_FIRMWARE_OK)
+			break;
+
+		if (time_after(jiffies, timeout)) {
+			ret = -ETIMEDOUT;
+			goto release;
+		}
+
+		msleep(10);
+	}
+
+	ret = 0;
+
+release:
+	sdio_set_block_size(card->func, 0);
+	sdio_release_host(card->func);
+	kfree(chunk_buffer);
+release_fw:
+	release_firmware(fw);
+
+out:
+	if (ret)
+		lbs_pr_err("failed to load firmware\n");
+
+	lbs_deb_leave_args(LBS_DEB_SDIO, "ret %d", ret);
+
+	return ret;
+}
+
+static int if_sdio_prog_firmware(struct if_sdio_card *card)
+{
+	int ret;
+	u16 scratch;
+
+	lbs_deb_enter(LBS_DEB_SDIO);
+
+	sdio_claim_host(card->func);
+	scratch = if_sdio_read_scratch(card, &ret);
+	sdio_release_host(card->func);
+
+	if (ret)
+		goto out;
+
+	if (scratch == IF_SDIO_FIRMWARE_OK) {
+		lbs_deb_sdio("firmware already loaded\n");
+		goto success;
+	}
+
+	ret = if_sdio_prog_helper(card);
+	if (ret)
+		goto out;
+
+	ret = if_sdio_prog_real(card);
+	if (ret)
+		goto out;
+
+success:
+	ret = 0;
+
+out:
+	lbs_deb_leave_args(LBS_DEB_SDIO, "ret %d", ret);
+
+	return ret;
+}
+
+/*******************************************************************/
+/* Libertas callbacks                                              */
+/*******************************************************************/
+
+static int if_sdio_host_to_card(wlan_private *priv, u8 type, u8 *buf, u16 nb)
+{
+	int ret;
+	struct if_sdio_card *card;
+	struct if_sdio_packet *packet, *cur;
+	u16 size;
+	unsigned long flags;
+
+	lbs_deb_enter_args(LBS_DEB_SDIO, "type %d, bytes %d", type, nb);
+
+	card = priv->card;
+
+	if (nb > (65536 - sizeof(struct if_sdio_packet) - 4)) {
+		ret = -EINVAL;
+		goto out;
+	}
+
+	/*
+	 * The transfer must be in one transaction or the firmware
+	 * goes suicidal.
+	 */
+	size = nb + 4;
+	if ((size > card->func->cur_blksize) || (size > 512)) {
+		size = (size + card->func->cur_blksize - 1) /
+			card->func->cur_blksize * card->func->cur_blksize;
+	}
+
+	packet = kzalloc(sizeof(struct if_sdio_packet) + size,
+			GFP_ATOMIC);
+	if (!packet) {
+		ret = -ENOMEM;
+		goto out;
+	}
+
+	packet->next = NULL;
+	packet->nb = size;
+
+	/*
+	 * SDIO specific header.
+	 */
+	packet->buffer[0] = (nb + 4) & 0xff;
+	packet->buffer[1] = ((nb + 4) >> 8) & 0xff;
+	packet->buffer[2] = type;
+	packet->buffer[3] = 0;
+
+	memcpy(packet->buffer + 4, buf, nb);
+
+	spin_lock_irqsave(&card->lock, flags);
+
+	if (!card->packets)
+		card->packets = packet;
+	else {
+		cur = card->packets;
+		while (cur->next)
+			cur = cur->next;
+		cur->next = packet;
+	}
+
+	switch (type) {
+	case MVMS_CMD:
+		priv->dnld_sent = DNLD_CMD_SENT;
+		break;
+	case MVMS_DAT:
+		priv->dnld_sent = DNLD_DATA_SENT;
+		break;
+	default:
+		lbs_deb_sdio("unknown packet type %d\n", (int)type);
+	}
+
+	spin_unlock_irqrestore(&card->lock, flags);
+
+	schedule_work(&card->packet_worker);
+
+	ret = 0;
+
+out:
+	lbs_deb_leave_args(LBS_DEB_SDIO, "ret %d", ret);
+
+	return ret;
+}
+
+static int if_sdio_get_int_status(wlan_private *priv, u8 *ireg)
+{
+	struct if_sdio_card *card;
+
+	lbs_deb_enter(LBS_DEB_SDIO);
+
+	card = priv->card;
+
+	*ireg = card->int_cause;
+	card->int_cause = 0;
+
+	lbs_deb_leave(LBS_DEB_SDIO);
+
+	return 0;
+}
+
+static int if_sdio_read_event_cause(wlan_private *priv)
+{
+	struct if_sdio_card *card;
+
+	lbs_deb_enter(LBS_DEB_SDIO);
+
+	card = priv->card;
+
+	priv->adapter->eventcause = card->event;
+
+	lbs_deb_leave(LBS_DEB_SDIO);
+
+	return 0;
+}
+
+/*******************************************************************/
+/* SDIO callbacks                                                  */
+/*******************************************************************/
+
+static void if_sdio_interrupt(struct sdio_func *func)
+{
+	int ret;
+	struct if_sdio_card *card;
+	u8 cause;
+
+	lbs_deb_enter(LBS_DEB_SDIO);
+
+	card = sdio_get_drvdata(func);
+
+	cause = sdio_readb(card->func, IF_SDIO_H_INT_STATUS, &ret);
+	if (ret)
+		goto out;
+
+	lbs_deb_sdio("interrupt: 0x%X\n", (unsigned)cause);
+
+	sdio_writeb(card->func, ~cause, IF_SDIO_H_INT_STATUS, &ret);
+	if (ret)
+		goto out;
+
+	/*
+	 * Ignore the define name, this really means the card has
+	 * successfully received the command.
+	 */
+	if (cause & IF_SDIO_H_INT_DNLD) {
+		if ((card->priv->dnld_sent == DNLD_DATA_SENT) &&
+			(card->priv->adapter->connect_status == LIBERTAS_CONNECTED))
+			netif_wake_queue(card->priv->dev);
+		card->priv->dnld_sent = DNLD_RES_RECEIVED;
+	}
+
+	if (cause & IF_SDIO_H_INT_UPLD) {
+		ret = if_sdio_card_to_host(card);
+		if (ret)
+			goto out;
+	}
+
+	ret = 0;
+
+out:
+	lbs_deb_leave_args(LBS_DEB_SDIO, "ret %d", ret);
+}
+
+static int if_sdio_probe(struct sdio_func *func,
+		const struct sdio_device_id *id)
+{
+	struct if_sdio_card *card;
+	wlan_private *priv;
+	int ret, i;
+	unsigned int model;
+	struct if_sdio_packet *packet;
+
+	lbs_deb_enter(LBS_DEB_SDIO);
+
+	for (i = 0;i < func->card->num_info;i++) {
+		if (sscanf(func->card->info[i],
+				"802.11 SDIO ID: %x", &model) == 1)
+			break;
+		if (sscanf(func->card->info[i],
+				"ID: %x", &model) == 1)
+			break;
+	}
+
+	if (i == func->card->num_info) {
+		lbs_pr_err("unable to identify card model\n");
+		return -ENODEV;
+	}
+
+	card = kzalloc(sizeof(struct if_sdio_card), GFP_KERNEL);
+	if (!card)
+		return -ENOMEM;
+
+	card->func = func;
+	card->model = model;
+	spin_lock_init(&card->lock);
+	INIT_WORK(&card->packet_worker, if_sdio_host_to_card_worker);
+
+	for (i = 0;i < ARRAY_SIZE(if_sdio_models);i++) {
+		if (card->model == if_sdio_models[i].model)
+			break;
+	}
+
+	if (i == ARRAY_SIZE(if_sdio_models)) {
+		lbs_pr_err("unkown card model 0x%x\n", card->model);
+		ret = -ENODEV;
+		goto free;
+	}
+
+	card->helper = if_sdio_models[i].helper;
+	card->firmware = if_sdio_models[i].firmware;
+
+	if (libertas_helper_name) {
+		lbs_deb_sdio("overriding helper firmware: %s\n",
+			libertas_helper_name);
+		card->helper = libertas_helper_name;
+	}
+
+	if (libertas_fw_name) {
+		lbs_deb_sdio("overriding firmware: %s\n", libertas_fw_name);
+		card->firmware = libertas_fw_name;
+	}
+
+	sdio_claim_host(func);
+
+	ret = sdio_enable_func(func);
+	if (ret)
+		goto release;
+
+	ret = sdio_claim_irq(func, if_sdio_interrupt);
+	if (ret)
+		goto disable;
+
+	card->ioport = sdio_readb(func, IF_SDIO_IOPORT, &ret);
+	if (ret)
+		goto release_int;
+
+	card->ioport |= sdio_readb(func, IF_SDIO_IOPORT + 1, &ret) << 8;
+	if (ret)
+		goto release_int;
+
+	card->ioport |= sdio_readb(func, IF_SDIO_IOPORT + 2, &ret) << 16;
+	if (ret)
+		goto release_int;
+
+	sdio_release_host(func);
+
+	sdio_set_drvdata(func, card);
+
+	lbs_deb_sdio("class = 0x%X, vendor = 0x%X, "
+			"device = 0x%X, model = 0x%X, ioport = 0x%X\n",
+			func->class, func->vendor, func->device,
+			model, (unsigned)card->ioport);
+
+	ret = if_sdio_prog_firmware(card);
+	if (ret)
+		goto reclaim;
+
+	priv = libertas_add_card(card, &func->dev);
+	if (!priv) {
+		ret = -ENOMEM;
+		goto reclaim;
+	}
+
+	card->priv = priv;
+
+	priv->card = card;
+	priv->hw_host_to_card = if_sdio_host_to_card;
+	priv->hw_get_int_status = if_sdio_get_int_status;
+	priv->hw_read_event_cause = if_sdio_read_event_cause;
+
+	priv->adapter->fw_ready = 1;
+
+	/*
+	 * Enable interrupts now that everything is set up
+	 */
+	sdio_claim_host(func);
+	sdio_writeb(func, 0x0f, IF_SDIO_H_INT_MASK, &ret);
+	sdio_release_host(func);
+	if (ret)
+		goto reclaim;
+
+	ret = libertas_start_card(priv);
+	if (ret)
+		goto err_activate_card;
+
+out:
+	lbs_deb_leave_args(LBS_DEB_SDIO, "ret %d", ret);
+
+	return ret;
+
+err_activate_card:
+	flush_scheduled_work();
+	free_netdev(priv->dev);
+	kfree(priv->adapter);
+reclaim:
+	sdio_claim_host(func);
+release_int:
+	sdio_release_irq(func);
+disable:
+	sdio_disable_func(func);
+release:
+	sdio_release_host(func);
+free:
+	while (card->packets) {
+		packet = card->packets;
+		card->packets = card->packets->next;
+		kfree(packet);
+	}
+
+	kfree(card);
+
+	goto out;
+}
+
+static void if_sdio_remove(struct sdio_func *func)
+{
+	struct if_sdio_card *card;
+	struct if_sdio_packet *packet;
+
+	lbs_deb_enter(LBS_DEB_SDIO);
+
+	card = sdio_get_drvdata(func);
+
+	card->priv->adapter->surpriseremoved = 1;
+
+	lbs_deb_sdio("call remove card\n");
+	libertas_stop_card(card->priv);
+	libertas_remove_card(card->priv);
+
+	flush_scheduled_work();
+
+	sdio_claim_host(func);
+	sdio_release_irq(func);
+	sdio_disable_func(func);
+	sdio_release_host(func);
+
+	while (card->packets) {
+		packet = card->packets;
+		card->packets = card->packets->next;
+		kfree(packet);
+	}
+
+	kfree(card);
+
+	lbs_deb_leave(LBS_DEB_SDIO);
+}
+
+static struct sdio_driver if_sdio_driver = {
+	.name		= "libertas_sdio",
+	.id_table	= if_sdio_ids,
+	.probe		= if_sdio_probe,
+	.remove		= if_sdio_remove,
+};
+
+/*******************************************************************/
+/* Module functions                                                */
+/*******************************************************************/
+
+static int if_sdio_init_module(void)
+{
+	int ret = 0;
+
+	lbs_deb_enter(LBS_DEB_SDIO);
+
+	printk(KERN_INFO "libertas_sdio: Libertas SDIO driver\n");
+	printk(KERN_INFO "libertas_sdio: Copyright Pierre Ossman\n");
+
+	ret = sdio_register_driver(&if_sdio_driver);
+
+	lbs_deb_leave_args(LBS_DEB_SDIO, "ret %d", ret);
+
+	return ret;
+}
+
+static void if_sdio_exit_module(void)
+{
+	lbs_deb_enter(LBS_DEB_SDIO);
+
+	sdio_unregister_driver(&if_sdio_driver);
+
+	lbs_deb_leave(LBS_DEB_SDIO);
+}
+
+module_init(if_sdio_init_module);
+module_exit(if_sdio_exit_module);
+
+MODULE_DESCRIPTION("Libertas SDIO WLAN Driver");
+MODULE_AUTHOR("Pierre Ossman");
+MODULE_LICENSE("GPL");