linux/drivers/bluetooth/hci_bcm.c

259 lines
5.4 KiB
C

/*
*
* Bluetooth HCI UART driver for Broadcom devices
*
* Copyright (C) 2015 Intel Corporation
*
*
* 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/errno.h>
#include <linux/skbuff.h>
#include <linux/firmware.h>
#include <net/bluetooth/bluetooth.h>
#include <net/bluetooth/hci_core.h>
#include "btbcm.h"
#include "hci_uart.h"
struct bcm_data {
struct sk_buff *rx_skb;
struct sk_buff_head txq;
};
static int bcm_set_baudrate(struct hci_uart *hu, unsigned int speed)
{
struct hci_dev *hdev = hu->hdev;
struct sk_buff *skb;
struct bcm_update_uart_baud_rate param;
if (speed > 3000000) {
struct bcm_write_uart_clock_setting clock;
clock.type = BCM_UART_CLOCK_48MHZ;
BT_DBG("%s: Set Controller clock (%d)", hdev->name, clock.type);
/* This Broadcom specific command changes the UART's controller
* clock for baud rate > 3000000.
*/
skb = __hci_cmd_sync(hdev, 0xfc45, 1, &clock, HCI_INIT_TIMEOUT);
if (IS_ERR(skb)) {
int err = PTR_ERR(skb);
BT_ERR("%s: BCM: failed to write clock command (%d)",
hdev->name, err);
return err;
}
kfree_skb(skb);
}
BT_DBG("%s: Set Controller UART speed to %d bit/s", hdev->name, speed);
param.zero = cpu_to_le16(0);
param.baud_rate = cpu_to_le32(speed);
/* This Broadcom specific command changes the UART's controller baud
* rate.
*/
skb = __hci_cmd_sync(hdev, 0xfc18, sizeof(param), &param,
HCI_INIT_TIMEOUT);
if (IS_ERR(skb)) {
int err = PTR_ERR(skb);
BT_ERR("%s: BCM: failed to write update baudrate command (%d)",
hdev->name, err);
return err;
}
kfree_skb(skb);
return 0;
}
static int bcm_open(struct hci_uart *hu)
{
struct bcm_data *bcm;
BT_DBG("hu %p", hu);
bcm = kzalloc(sizeof(*bcm), GFP_KERNEL);
if (!bcm)
return -ENOMEM;
skb_queue_head_init(&bcm->txq);
hu->priv = bcm;
return 0;
}
static int bcm_close(struct hci_uart *hu)
{
struct bcm_data *bcm = hu->priv;
BT_DBG("hu %p", hu);
skb_queue_purge(&bcm->txq);
kfree_skb(bcm->rx_skb);
kfree(bcm);
hu->priv = NULL;
return 0;
}
static int bcm_flush(struct hci_uart *hu)
{
struct bcm_data *bcm = hu->priv;
BT_DBG("hu %p", hu);
skb_queue_purge(&bcm->txq);
return 0;
}
static int bcm_setup(struct hci_uart *hu)
{
char fw_name[64];
const struct firmware *fw;
unsigned int speed;
int err;
BT_DBG("hu %p", hu);
hu->hdev->set_bdaddr = btbcm_set_bdaddr;
err = btbcm_initialize(hu->hdev, fw_name, sizeof(fw_name));
if (err)
return err;
err = request_firmware(&fw, fw_name, &hu->hdev->dev);
if (err < 0) {
BT_INFO("%s: BCM: Patch %s not found", hu->hdev->name, fw_name);
return 0;
}
err = btbcm_patchram(hu->hdev, fw);
if (err) {
BT_INFO("%s: BCM: Patch failed (%d)", hu->hdev->name, err);
goto finalize;
}
/* Init speed if any */
if (hu->init_speed)
speed = hu->init_speed;
else if (hu->proto->init_speed)
speed = hu->proto->init_speed;
else
speed = 0;
if (speed)
hci_uart_set_baudrate(hu, speed);
/* Operational speed if any */
if (hu->oper_speed)
speed = hu->oper_speed;
else if (hu->proto->oper_speed)
speed = hu->proto->oper_speed;
else
speed = 0;
if (speed) {
err = bcm_set_baudrate(hu, speed);
if (!err)
hci_uart_set_baudrate(hu, speed);
}
finalize:
release_firmware(fw);
err = btbcm_finalize(hu->hdev);
return err;
}
static const struct h4_recv_pkt bcm_recv_pkts[] = {
{ H4_RECV_ACL, .recv = hci_recv_frame },
{ H4_RECV_SCO, .recv = hci_recv_frame },
{ H4_RECV_EVENT, .recv = hci_recv_frame },
};
static int bcm_recv(struct hci_uart *hu, const void *data, int count)
{
struct bcm_data *bcm = hu->priv;
if (!test_bit(HCI_UART_REGISTERED, &hu->flags))
return -EUNATCH;
bcm->rx_skb = h4_recv_buf(hu->hdev, bcm->rx_skb, data, count,
bcm_recv_pkts, ARRAY_SIZE(bcm_recv_pkts));
if (IS_ERR(bcm->rx_skb)) {
int err = PTR_ERR(bcm->rx_skb);
BT_ERR("%s: Frame reassembly failed (%d)", hu->hdev->name, err);
bcm->rx_skb = NULL;
return err;
}
return count;
}
static int bcm_enqueue(struct hci_uart *hu, struct sk_buff *skb)
{
struct bcm_data *bcm = hu->priv;
BT_DBG("hu %p skb %p", hu, skb);
/* Prepend skb with frame type */
memcpy(skb_push(skb, 1), &bt_cb(skb)->pkt_type, 1);
skb_queue_tail(&bcm->txq, skb);
return 0;
}
static struct sk_buff *bcm_dequeue(struct hci_uart *hu)
{
struct bcm_data *bcm = hu->priv;
return skb_dequeue(&bcm->txq);
}
static const struct hci_uart_proto bcm_proto = {
.id = HCI_UART_BCM,
.name = "BCM",
.init_speed = 115200,
.oper_speed = 4000000,
.open = bcm_open,
.close = bcm_close,
.flush = bcm_flush,
.setup = bcm_setup,
.set_baudrate = bcm_set_baudrate,
.recv = bcm_recv,
.enqueue = bcm_enqueue,
.dequeue = bcm_dequeue,
};
int __init bcm_init(void)
{
return hci_uart_register_proto(&bcm_proto);
}
int __exit bcm_deinit(void)
{
return hci_uart_unregister_proto(&bcm_proto);
}