/*
*
* 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(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");
