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bluetooth: hci_bcsp.c small cleanups/api users

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Use bitrev16 from lib/bitrev.c.

Use the get_unaligned_be16 to get the crc from the packet, create a
small helper function for this.

Fix a shadowed variable sparse warning:
drivers/bluetooth/hci_bcsp.c:218:26: warning: symbol 'hdr' shadows an earlier one
drivers/bluetooth/hci_bcsp.c:187:5: originally declared here

[akpm@linux-foundation.org: select CONFIG_BITREVERSE, noted by akinobu.mita@gmail.com]
Signed-off-by: Harvey Harrison <harvey.harrison@gmail.com>
Acked-by: Marcel Holtmann <marcel@holtmann.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Harvey Harrison 2008-06-10 12:48:45 -07:00 committed by David S. Miller
parent 9a727a250c
commit c5ec514016
2 changed files with 14 additions and 31 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

1
drivers/bluetooth/Kconfig
View File

@ -71,6 +71,7 @@ config BT_HCIUART_H4
config BT_HCIUART_BCSP
bool "BCSP protocol support"
depends on BT_HCIUART
select CONFIG_BITREVERSE
help
BCSP (BlueCore Serial Protocol) is serial protocol for communication
between Bluetooth device and host. This protocol is required for non

44
drivers/bluetooth/hci_bcsp.c
View File

@ -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;