diff options
Diffstat (limited to 'drivers/bluetooth')
| -rw-r--r-- | drivers/bluetooth/Kconfig | 1 | ||||
| -rw-r--r-- | drivers/bluetooth/hci_bcsp.c | 44 |
2 files changed, 14 insertions, 31 deletions
diff --git a/drivers/bluetooth/Kconfig b/drivers/bluetooth/Kconfig index 075598e1c502..a235ca787465 100644 --- a/drivers/bluetooth/Kconfig +++ b/drivers/bluetooth/Kconfig @@ -71,6 +71,7 @@ config BT_HCIUART_H4 config BT_HCIUART_BCSP bool "BCSP protocol support" depends on BT_HCIUART + select BITREVERSE help BCSP (BlueCore Serial Protocol) is serial protocol for communication between Bluetooth device and host. This protocol is required for non diff --git a/drivers/bluetooth/hci_bcsp.c b/drivers/bluetooth/hci_bcsp.c index 696f7528f022..4d37bb312ee3 100644 --- a/drivers/bluetooth/hci_bcsp.c +++ b/drivers/bluetooth/hci_bcsp.c @@ -39,6 +39,8 @@ #include <linux/signal.h> #include <linux/ioctl.h> #include <linux/skbuff.h> +#include <linux/bitrev.h> +#include <asm/unaligned.h> #include <net/bluetooth/bluetooth.h> #include <net/bluetooth/hci_core.h> @@ -124,27 +126,6 @@ static void bcsp_crc_update(u16 *crc, u8 d) *crc = reg; } -/* - Get reverse of generated crc - - Implementation note - The crc generator (bcsp_crc_init() and bcsp_crc_update()) - creates a reversed crc, so it needs to be swapped back before - being passed on. -*/ -static u16 bcsp_crc_reverse(u16 crc) -{ - u16 b, rev; - - for (b = 0, rev = 0; b < 16; b++) { - rev = rev << 1; - rev |= (crc & 1); - crc = crc >> 1; - } - - return (rev); -} - /* ---- BCSP core ---- */ static void bcsp_slip_msgdelim(struct sk_buff *skb) @@ -235,10 +216,10 @@ static struct sk_buff *bcsp_prepare_pkt(struct bcsp_struct *bcsp, u8 *data, } if (hciextn && chan == 5) { - struct hci_command_hdr *hdr = (struct hci_command_hdr *) data; + __le16 opcode = ((struct hci_command_hdr *)data)->opcode; /* Vendor specific commands */ - if (hci_opcode_ogf(__le16_to_cpu(hdr->opcode)) == 0x3f) { + if (hci_opcode_ogf(__le16_to_cpu(opcode)) == 0x3f) { u8 desc = *(data + HCI_COMMAND_HDR_SIZE); if ((desc & 0xf0) == 0xc0) { data += HCI_COMMAND_HDR_SIZE + 1; @@ -296,7 +277,7 @@ static struct sk_buff *bcsp_prepare_pkt(struct bcsp_struct *bcsp, u8 *data, /* Put CRC */ if (bcsp->use_crc) { - bcsp_txmsg_crc = bcsp_crc_reverse(bcsp_txmsg_crc); + bcsp_txmsg_crc = bitrev16(bcsp_txmsg_crc); bcsp_slip_one_byte(nskb, (u8) ((bcsp_txmsg_crc >> 8) & 0x00ff)); bcsp_slip_one_byte(nskb, (u8) (bcsp_txmsg_crc & 0x00ff)); } @@ -566,6 +547,11 @@ static void bcsp_complete_rx_pkt(struct hci_uart *hu) bcsp->rx_skb = NULL; } +static u16 bscp_get_crc(struct bcsp_struct *bcsp) +{ + return get_unaligned_be16(&bcsp->rx_skb->data[bcsp->rx_skb->len - 2]); +} + /* Recv data */ static int bcsp_recv(struct hci_uart *hu, void *data, int count) { @@ -624,14 +610,10 @@ static int bcsp_recv(struct hci_uart *hu, void *data, int count) continue; case BCSP_W4_CRC: - if (bcsp_crc_reverse(bcsp->message_crc) != - (bcsp->rx_skb->data[bcsp->rx_skb->len - 2] << 8) + - bcsp->rx_skb->data[bcsp->rx_skb->len - 1]) { - + if (bitrev16(bcsp->message_crc) != bscp_get_crc(bcsp)) { BT_ERR ("Checksum failed: computed %04x received %04x", - bcsp_crc_reverse(bcsp->message_crc), - (bcsp->rx_skb-> data[bcsp->rx_skb->len - 2] << 8) + - bcsp->rx_skb->data[bcsp->rx_skb->len - 1]); + bitrev16(bcsp->message_crc), + bscp_get_crc(bcsp)); kfree_skb(bcsp->rx_skb); bcsp->rx_state = BCSP_W4_PKT_DELIMITER; |