Donate to e Foundation | Murena handsets with /e/OS | Own a part of Murena! Learn more

Commit ddbaf13e authored by Marcel Holtmann's avatar Marcel Holtmann Committed by David S. Miller
Browse files

[Bluetooth] Add generic driver for Bluetooth SDIO devices 



This patch adds a generic driver for Bluetooth SDIO devices. It
supports Type-A and Type-B devices.

Signed-off-by: default avatarDavid Vrabel <david.vrabel@csr.com>
Signed-off-by: default avatarMarcel Holtmann <marcel@holtmann.org>
parent ac019360

drivers/bluetooth/Kconfig

+11 −0
Original line number Diff line number Diff line
@@ -22,6 +22,17 @@ config BT_HCIUSB_SCO 


	  Say Y here to compile support for SCO over HCI USB.



config BT_HCIBTSDIO

	tristate "HCI SDIO driver"

	depends on MMC

	help

	  Bluetooth HCI SDIO driver.

	  This driver is required if you want to use Bluetooth device with

	  SDIO interface.



	  Say Y here to compile support for Bluetooth SDIO devices into the

	  kernel or say M to compile it as module (btsdio).



config BT_HCIUART

	tristate "HCI UART driver"

	help

drivers/bluetooth/Makefile

+2 −0
Original line number Diff line number Diff line
@@ -13,6 +13,8 @@ obj-$(CONFIG_BT_HCIBT3C) += bt3c_cs.o 
obj-$(CONFIG_BT_HCIBLUECARD)	+= bluecard_cs.o

obj-$(CONFIG_BT_HCIBTUART)	+= btuart_cs.o



obj-$(CONFIG_BT_HCIBTSDIO)	+= btsdio.o



hci_uart-y				:= hci_ldisc.o

hci_uart-$(CONFIG_BT_HCIUART_H4)	+= hci_h4.o

hci_uart-$(CONFIG_BT_HCIUART_BCSP)	+= hci_bcsp.o

drivers/bluetooth/btsdio.c

0 → 100644
+406 −0
Original line number Diff line number Diff line 
/*

 *

 *  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>



#ifndef CONFIG_BT_HCIBTSDIO_DEBUG

#undef  BT_DBG

#define BT_DBG(D...)

#endif



#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) {

		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);

		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) {

		kfree(skb);

		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");