diff options
| author | Frederic Danis <frederic.danis@linux.intel.com> | 2015-06-09 16:15:37 +0200 |
|---|---|---|
| committer | Marcel Holtmann <marcel@holtmann.org> | 2015-06-09 23:27:35 +0200 |
| commit | 61b2fc2bb53f162121f4267f10d2a662911f3e86 (patch) | |
| tree | 4cfde9a55db67caa61ed59dd376341b664bea68d | |
| parent | c9d442038ef729549e1fd14ff1d61d0d3a7f0560 (diff) | |
| download | linux-61b2fc2bb53f162121f4267f10d2a662911f3e86.tar.bz2 | |
Bluetooth: hci_uart: Add bcm_set_baudrate()
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>
| -rw-r--r-- | drivers/bluetooth/btbcm.h | 12 | ||||
| -rw-r--r-- | drivers/bluetooth/hci_bcm.c | 58 |
2 files changed, 70 insertions, 0 deletions
diff --git a/drivers/bluetooth/btbcm.h b/drivers/bluetooth/btbcm.h index f405f8424399..02f5f9665411 100644 --- a/drivers/bluetooth/btbcm.h +++ b/drivers/bluetooth/btbcm.h @@ -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); diff --git a/drivers/bluetooth/hci_bcm.c b/drivers/bluetooth/hci_bcm.c index 070452256816..e4d66b61cda0 100644 --- a/drivers/bluetooth/hci_bcm.c +++ b/drivers/bluetooth/hci_bcm.c @@ -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), ¶m, + 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, |