/* * *  Generic Bluetooth SDIO driver * *  Copyright (C) 2007  Cambridge Silicon Radio Ltd. *  Copyright (C) 2007  Marcel Holtmann <marcel@holtmann.org> * * *  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 * */#include <linux/kernel.h>#include <linux/module.h>#include <linux/init.h>#include <linux/slab.h>#include <linux/types.h>#include <linux/sched.h>#include <linux/errno.h>#include <linux/skbuff.h>#include <linux/mmc/sdio_ids.h>#include <linux/mmc/sdio_func.h>#include <net/bluetooth/bluetooth.h>#include <net/bluetooth/hci_core.h>#define VERSION "0.1"static const struct sdio_device_id btsdio_table[] = {	/* Generic Bluetooth Type-A SDIO device */	{ SDIO_DEVICE_CLASS(SDIO_CLASS_BT_A) },	/* Generic Bluetooth Type-B SDIO device */	{ SDIO_DEVICE_CLASS(SDIO_CLASS_BT_B) },	{ }	/* Terminating entry */};MODULE_DEVICE_TABLE(sdio, btsdio_table);struct btsdio_data {	struct hci_dev   *hdev;	struct sdio_func *func;	struct work_struct work;	struct sk_buff_head txq;};#define REG_RDAT     0x00	/* Receiver Data */#define REG_TDAT     0x00	/* Transmitter Data */#define REG_PC_RRT   0x10	/* Read Packet Control */#define REG_PC_WRT   0x11	/* Write Packet Control */#define REG_RTC_STAT 0x12	/* Retry Control Status */#define REG_RTC_SET  0x12	/* Retry Control Set */#define REG_INTRD    0x13	/* Interrupt Indication */#define REG_CL_INTRD 0x13	/* Interrupt Clear */#define REG_EN_INTRD 0x14	/* Interrupt Enable */#define REG_MD_STAT  0x20	/* Bluetooth Mode Status */static int btsdio_tx_packet(struct btsdio_data *data, struct sk_buff *skb){	int err;	BT_DBG("%s", data->hdev->name);	/* Prepend Type-A header */	skb_push(skb, 4);	skb->data[0] = (skb->len & 0x0000ff);	skb->data[1] = (skb->len & 0x00ff00) >> 8;	skb->data[2] = (skb->len & 0xff0000) >> 16;	skb->data[3] = bt_cb(skb)->pkt_type;	err = sdio_writesb(data->func, REG_TDAT, skb->data, skb->len);	if (err < 0) {		skb_pull(skb, 4);		sdio_writeb(data->func, 0x01, REG_PC_WRT, NULL);		return err;	}	data->hdev->stat.byte_tx += skb->len;	kfree_skb(skb);	return 0;}static void btsdio_work(struct work_struct *work){	struct btsdio_data *data = container_of(work, struct btsdio_data, work);	struct sk_buff *skb;	int err;	BT_DBG("%s", data->hdev->name);	sdio_claim_host(data->func);	while ((skb = skb_dequeue(&data->txq))) {		err = btsdio_tx_packet(data, skb);		if (err < 0) {			data->hdev->stat.err_tx++;			skb_queue_head(&data->txq, skb);			break;		}	}	sdio_release_host(data->func);}static int btsdio_rx_packet(struct btsdio_data *data){	u8 hdr[4] __attribute__ ((aligned(4)));	struct sk_buff *skb;	int err, len;	BT_DBG("%s", data->hdev->name);	err = sdio_readsb(data->func, hdr, REG_RDAT, 4);	if (err < 0)		return err;	len = hdr[0] | (hdr[1] << 8) | (hdr[2] << 16);	if (len < 4 || len > 65543)		return -EILSEQ;	skb = bt_skb_alloc(len - 4, GFP_KERNEL);	if (!skb) {		/* Out of memory. Prepare a read retry and just		 * return with the expectation that the next time		 * we're called we'll have more memory. */		return -ENOMEM;	}	skb_put(skb, len - 4);	err = sdio_readsb(data->func, skb->data, REG_RDAT, len - 4);	if (err < 0) {		kfree_skb(skb);		return err;	}	data->hdev->stat.byte_rx += len;	skb->dev = (void *) data->hdev;	bt_cb(skb)->pkt_type = hdr[3];	err = hci_recv_frame(skb);	if (err < 0)		return err;	sdio_writeb(data->func, 0x00, REG_PC_RRT, NULL);	return 0;}static void btsdio_interrupt(struct sdio_func *func){	struct btsdio_data *data = sdio_get_drvdata(func);	int intrd;	BT_DBG("%s", data->hdev->name);	intrd = sdio_readb(func, REG_INTRD, NULL);	if (intrd & 0x01) {		sdio_writeb(func, 0x01, REG_CL_INTRD, NULL);		if (btsdio_rx_packet(data) < 0) {			data->hdev->stat.err_rx++;			sdio_writeb(data->func, 0x01, REG_PC_RRT, NULL);		}	}}static int btsdio_open(struct hci_dev *hdev){	struct btsdio_data *data = hdev->driver_data;	int err;	BT_DBG("%s", hdev->name);	if (test_and_set_bit(HCI_RUNNING, &hdev->flags))		return 0;	sdio_claim_host(data->func);	err = sdio_enable_func(data->func);	if (err < 0) {		clear_bit(HCI_RUNNING, &hdev->flags);		goto release;	}	err = sdio_claim_irq(data->func, btsdio_interrupt);	if (err < 0) {		sdio_disable_func(data->func);		clear_bit(HCI_RUNNING, &hdev->flags);		goto release;	}	if (data->func->class == SDIO_CLASS_BT_B)		sdio_writeb(data->func, 0x00, REG_MD_STAT, NULL);	sdio_writeb(data->func, 0x01, REG_EN_INTRD, NULL);release:	sdio_release_host(data->func);	return err;}static int btsdio_close(struct hci_dev *hdev){	struct btsdio_data *data = hdev->driver_data;	BT_DBG("%s", hdev->name);	if (!test_and_clear_bit(HCI_RUNNING, &hdev->flags))		return 0;	sdio_claim_host(data->func);	sdio_writeb(data->func, 0x00, REG_EN_INTRD, NULL);	sdio_release_irq(data->func);	sdio_disable_func(data->func);	sdio_release_host(data->func);	return 0;}static int btsdio_flush(struct hci_dev *hdev){	struct btsdio_data *data = hdev->driver_data;	BT_DBG("%s", hdev->name);	skb_queue_purge(&data->txq);	return 0;}static int btsdio_send_frame(struct sk_buff *skb){	struct hci_dev *hdev = (struct hci_dev *) skb->dev;	struct btsdio_data *data = hdev->driver_data;	BT_DBG("%s", hdev->name);	if (!test_bit(HCI_RUNNING, &hdev->flags))		return -EBUSY;	switch (bt_cb(skb)->pkt_type) {	case HCI_COMMAND_PKT:		hdev->stat.cmd_tx++;		break;	case HCI_ACLDATA_PKT:		hdev->stat.acl_tx++;		break;	case HCI_SCODATA_PKT:		hdev->stat.sco_tx++;		break;	default:		return -EILSEQ;	}	skb_queue_tail(&data->txq, skb);	schedule_work(&data->work);	return 0;}static void btsdio_destruct(struct hci_dev *hdev){	struct btsdio_data *data = hdev->driver_data;	BT_DBG("%s", hdev->name);	kfree(data);}static int btsdio_probe(struct sdio_func *func,				const struct sdio_device_id *id){	struct btsdio_data *data;	struct hci_dev *hdev;	struct sdio_func_tuple *tuple = func->tuples;	int err;	BT_DBG("func %p id %p class 0x%04x", func, id, func->class);	while (tuple) {		BT_DBG("code 0x%x size %d", tuple->code, tuple->size);		tuple = tuple->next;	}	data = kzalloc(sizeof(*data), GFP_KERNEL);	if (!data)		return -ENOMEM;	data->func = func;	INIT_WORK(&data->work, btsdio_work);	skb_queue_head_init(&data->txq);	hdev = hci_alloc_dev();	if (!hdev) {		kfree(data);		return -ENOMEM;	}	hdev->type = HCI_SDIO;	hdev->driver_data = data;	data->hdev = hdev;	SET_HCIDEV_DEV(hdev, &func->dev);	hdev->open     = btsdio_open;	hdev->close    = btsdio_close;	hdev->flush    = btsdio_flush;	hdev->send     = btsdio_send_frame;	hdev->destruct = btsdio_destruct;	hdev->owner = THIS_MODULE;	err = hci_register_dev(hdev);	if (err < 0) {		hci_free_dev(hdev);		kfree(data);		return err;	}	sdio_set_drvdata(func, data);	return 0;}static void btsdio_remove(struct sdio_func *func){	struct btsdio_data *data = sdio_get_drvdata(func);	struct hci_dev *hdev;	BT_DBG("func %p", func);	if (!data)		return;	hdev = data->hdev;	sdio_set_drvdata(func, NULL);	hci_unregister_dev(hdev);	hci_free_dev(hdev);}static struct sdio_driver btsdio_driver = {	.name		= "btsdio",	.probe		= btsdio_probe,	.remove		= btsdio_remove,	.id_table	= btsdio_table,};static int __init btsdio_init(void){	BT_INFO("Generic Bluetooth SDIO driver ver %s", VERSION);	return sdio_register_driver(&btsdio_driver);}static void __exit btsdio_exit(void){	sdio_unregister_driver(&btsdio_driver);}module_init(btsdio_init);module_exit(btsdio_exit);MODULE_AUTHOR("Marcel Holtmann <marcel@holtmann.org>");MODULE_DESCRIPTION("Generic Bluetooth SDIO driver ver " VERSION);MODULE_VERSION(VERSION);MODULE_LICENSE("GPL");