redonkable/remarkable-linux
redonkable/remarkable-linux
1
0
Fork 0
Code Releases Activity

Bluetooth: hci_uart: Add bcm_set_baudrate()

Browse source 
Add vendor specific command to change controller device speed.

Signed-off-by: Frederic Danis <frederic.danis@linux.intel.com>
Signed-off-by: Marcel Holtmann <marcel@holtmann.org>
This commit is contained in:
Frederic Danis 2015-06-09 16:15:37 +02:00 committed by Marcel Holtmann
parent c9d442038e
commit 61b2fc2bb5
2 changed files with 70 additions and 0 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

12
drivers/bluetooth/btbcm.h
View file

@ -21,6 +21,18 @@
*
*/
#define BCM_UART_CLOCK_48MHZ 0x01
#define BCM_UART_CLOCK_24MHZ 0x02
struct bcm_update_uart_baud_rate {
__le16 zero;
__le32 baud_rate;
} __packed;
struct bcm_write_uart_clock_setting {
__u8 type;
} __packed;
#if IS_ENABLED(CONFIG_BT_BCM)
int btbcm_check_bdaddr(struct hci_dev *hdev);

58
drivers/bluetooth/hci_bcm.c
View file

@ -37,6 +37,55 @@ struct bcm_data {
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;
@ -107,6 +156,12 @@ static int bcm_setup(struct hci_uart *hu)
if (hu->proto->init_speed)
hci_uart_set_baudrate(hu, hu->proto->init_speed);
if (hu->proto->oper_speed) {
err = bcm_set_baudrate(hu, hu->proto->oper_speed);
if (!err)
hci_uart_set_baudrate(hu, hu->proto->oper_speed);
}
finalize:
release_firmware(fw);
@ -162,10 +217,13 @@ static struct sk_buff *bcm_dequeue(struct hci_uart *hu)
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,