692 строки
14 KiB
C
692 строки
14 KiB
C
/*
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*
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* Driver for Bluetooth PCMCIA cards with HCI UART interface
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*
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* Copyright (C) 2001-2002 Marcel Holtmann <marcel@holtmann.org>
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*
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation;
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*
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* Software distributed under the License is distributed on an "AS
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* IS" basis, WITHOUT WARRANTY OF ANY KIND, either express or
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* implied. See the License for the specific language governing
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* rights and limitations under the License.
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*
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* The initial developer of the original code is David A. Hinds
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* <dahinds@users.sourceforge.net>. Portions created by David A. Hinds
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* are Copyright (C) 1999 David A. Hinds. All Rights Reserved.
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*
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*/
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#include <linux/module.h>
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#include <linux/kernel.h>
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#include <linux/init.h>
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#include <linux/slab.h>
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#include <linux/types.h>
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#include <linux/delay.h>
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#include <linux/errno.h>
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#include <linux/ptrace.h>
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#include <linux/ioport.h>
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#include <linux/spinlock.h>
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#include <linux/moduleparam.h>
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#include <linux/skbuff.h>
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#include <linux/string.h>
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#include <linux/serial.h>
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#include <linux/serial_reg.h>
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#include <linux/bitops.h>
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#include <asm/io.h>
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#include <pcmcia/cistpl.h>
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#include <pcmcia/ciscode.h>
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#include <pcmcia/ds.h>
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#include <pcmcia/cisreg.h>
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#include <net/bluetooth/bluetooth.h>
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#include <net/bluetooth/hci_core.h>
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/* ======================== Module parameters ======================== */
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MODULE_AUTHOR("Marcel Holtmann <marcel@holtmann.org>");
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MODULE_DESCRIPTION("Bluetooth driver for Bluetooth PCMCIA cards with HCI UART interface");
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MODULE_LICENSE("GPL");
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/* ======================== Local structures ======================== */
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typedef struct btuart_info_t {
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struct pcmcia_device *p_dev;
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struct hci_dev *hdev;
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spinlock_t lock; /* For serializing operations */
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struct sk_buff_head txq;
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unsigned long tx_state;
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unsigned long rx_state;
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unsigned long rx_count;
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struct sk_buff *rx_skb;
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} btuart_info_t;
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static int btuart_config(struct pcmcia_device *link);
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static void btuart_release(struct pcmcia_device *link);
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static void btuart_detach(struct pcmcia_device *p_dev);
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/* Maximum baud rate */
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#define SPEED_MAX 115200
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/* Default baud rate: 57600, 115200, 230400 or 460800 */
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#define DEFAULT_BAUD_RATE 115200
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/* Transmit states */
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#define XMIT_SENDING 1
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#define XMIT_WAKEUP 2
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#define XMIT_WAITING 8
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/* Receiver states */
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#define RECV_WAIT_PACKET_TYPE 0
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#define RECV_WAIT_EVENT_HEADER 1
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#define RECV_WAIT_ACL_HEADER 2
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#define RECV_WAIT_SCO_HEADER 3
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#define RECV_WAIT_DATA 4
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/* ======================== Interrupt handling ======================== */
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static int btuart_write(unsigned int iobase, int fifo_size, __u8 *buf, int len)
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{
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int actual = 0;
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/* Tx FIFO should be empty */
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if (!(inb(iobase + UART_LSR) & UART_LSR_THRE))
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return 0;
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/* Fill FIFO with current frame */
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while ((fifo_size-- > 0) && (actual < len)) {
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/* Transmit next byte */
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outb(buf[actual], iobase + UART_TX);
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actual++;
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}
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return actual;
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}
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static void btuart_write_wakeup(btuart_info_t *info)
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{
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if (!info) {
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BT_ERR("Unknown device");
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return;
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}
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if (test_and_set_bit(XMIT_SENDING, &(info->tx_state))) {
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set_bit(XMIT_WAKEUP, &(info->tx_state));
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return;
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}
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do {
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unsigned int iobase = info->p_dev->resource[0]->start;
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register struct sk_buff *skb;
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int len;
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clear_bit(XMIT_WAKEUP, &(info->tx_state));
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if (!pcmcia_dev_present(info->p_dev))
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return;
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if (!(skb = skb_dequeue(&(info->txq))))
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break;
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/* Send frame */
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len = btuart_write(iobase, 16, skb->data, skb->len);
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set_bit(XMIT_WAKEUP, &(info->tx_state));
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if (len == skb->len) {
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kfree_skb(skb);
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} else {
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skb_pull(skb, len);
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skb_queue_head(&(info->txq), skb);
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}
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info->hdev->stat.byte_tx += len;
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} while (test_bit(XMIT_WAKEUP, &(info->tx_state)));
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clear_bit(XMIT_SENDING, &(info->tx_state));
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}
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static void btuart_receive(btuart_info_t *info)
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{
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unsigned int iobase;
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int boguscount = 0;
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if (!info) {
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BT_ERR("Unknown device");
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return;
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}
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iobase = info->p_dev->resource[0]->start;
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do {
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info->hdev->stat.byte_rx++;
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/* Allocate packet */
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if (info->rx_skb == NULL) {
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info->rx_state = RECV_WAIT_PACKET_TYPE;
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info->rx_count = 0;
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if (!(info->rx_skb = bt_skb_alloc(HCI_MAX_FRAME_SIZE, GFP_ATOMIC))) {
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BT_ERR("Can't allocate mem for new packet");
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return;
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}
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}
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if (info->rx_state == RECV_WAIT_PACKET_TYPE) {
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info->rx_skb->dev = (void *) info->hdev;
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bt_cb(info->rx_skb)->pkt_type = inb(iobase + UART_RX);
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switch (bt_cb(info->rx_skb)->pkt_type) {
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case HCI_EVENT_PKT:
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info->rx_state = RECV_WAIT_EVENT_HEADER;
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info->rx_count = HCI_EVENT_HDR_SIZE;
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break;
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case HCI_ACLDATA_PKT:
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info->rx_state = RECV_WAIT_ACL_HEADER;
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info->rx_count = HCI_ACL_HDR_SIZE;
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break;
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case HCI_SCODATA_PKT:
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info->rx_state = RECV_WAIT_SCO_HEADER;
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info->rx_count = HCI_SCO_HDR_SIZE;
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break;
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default:
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/* Unknown packet */
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BT_ERR("Unknown HCI packet with type 0x%02x received", bt_cb(info->rx_skb)->pkt_type);
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info->hdev->stat.err_rx++;
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clear_bit(HCI_RUNNING, &(info->hdev->flags));
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kfree_skb(info->rx_skb);
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info->rx_skb = NULL;
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break;
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}
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} else {
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*skb_put(info->rx_skb, 1) = inb(iobase + UART_RX);
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info->rx_count--;
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if (info->rx_count == 0) {
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int dlen;
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struct hci_event_hdr *eh;
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struct hci_acl_hdr *ah;
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struct hci_sco_hdr *sh;
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switch (info->rx_state) {
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case RECV_WAIT_EVENT_HEADER:
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eh = hci_event_hdr(info->rx_skb);
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info->rx_state = RECV_WAIT_DATA;
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info->rx_count = eh->plen;
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break;
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case RECV_WAIT_ACL_HEADER:
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ah = hci_acl_hdr(info->rx_skb);
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dlen = __le16_to_cpu(ah->dlen);
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info->rx_state = RECV_WAIT_DATA;
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info->rx_count = dlen;
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break;
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case RECV_WAIT_SCO_HEADER:
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sh = hci_sco_hdr(info->rx_skb);
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info->rx_state = RECV_WAIT_DATA;
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info->rx_count = sh->dlen;
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break;
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case RECV_WAIT_DATA:
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hci_recv_frame(info->rx_skb);
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info->rx_skb = NULL;
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break;
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}
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}
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}
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/* Make sure we don't stay here too long */
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if (boguscount++ > 16)
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break;
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} while (inb(iobase + UART_LSR) & UART_LSR_DR);
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}
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static irqreturn_t btuart_interrupt(int irq, void *dev_inst)
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{
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btuart_info_t *info = dev_inst;
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unsigned int iobase;
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int boguscount = 0;
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int iir, lsr;
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irqreturn_t r = IRQ_NONE;
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if (!info || !info->hdev)
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/* our irq handler is shared */
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return IRQ_NONE;
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iobase = info->p_dev->resource[0]->start;
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spin_lock(&(info->lock));
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iir = inb(iobase + UART_IIR) & UART_IIR_ID;
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while (iir) {
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r = IRQ_HANDLED;
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/* Clear interrupt */
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lsr = inb(iobase + UART_LSR);
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switch (iir) {
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case UART_IIR_RLSI:
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BT_ERR("RLSI");
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break;
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case UART_IIR_RDI:
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/* Receive interrupt */
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btuart_receive(info);
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break;
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case UART_IIR_THRI:
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if (lsr & UART_LSR_THRE) {
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/* Transmitter ready for data */
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btuart_write_wakeup(info);
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}
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break;
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default:
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BT_ERR("Unhandled IIR=%#x", iir);
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break;
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}
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/* Make sure we don't stay here too long */
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if (boguscount++ > 100)
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break;
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iir = inb(iobase + UART_IIR) & UART_IIR_ID;
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}
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spin_unlock(&(info->lock));
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return r;
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}
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static void btuart_change_speed(btuart_info_t *info, unsigned int speed)
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{
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unsigned long flags;
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unsigned int iobase;
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int fcr; /* FIFO control reg */
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int lcr; /* Line control reg */
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int divisor;
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if (!info) {
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BT_ERR("Unknown device");
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return;
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}
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iobase = info->p_dev->resource[0]->start;
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spin_lock_irqsave(&(info->lock), flags);
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/* Turn off interrupts */
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outb(0, iobase + UART_IER);
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divisor = SPEED_MAX / speed;
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fcr = UART_FCR_ENABLE_FIFO | UART_FCR_CLEAR_RCVR | UART_FCR_CLEAR_XMIT;
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/*
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* Use trigger level 1 to avoid 3 ms. timeout delay at 9600 bps, and
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* almost 1,7 ms at 19200 bps. At speeds above that we can just forget
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* about this timeout since it will always be fast enough.
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*/
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if (speed < 38400)
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fcr |= UART_FCR_TRIGGER_1;
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else
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fcr |= UART_FCR_TRIGGER_14;
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/* Bluetooth cards use 8N1 */
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lcr = UART_LCR_WLEN8;
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outb(UART_LCR_DLAB | lcr, iobase + UART_LCR); /* Set DLAB */
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outb(divisor & 0xff, iobase + UART_DLL); /* Set speed */
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outb(divisor >> 8, iobase + UART_DLM);
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outb(lcr, iobase + UART_LCR); /* Set 8N1 */
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outb(fcr, iobase + UART_FCR); /* Enable FIFO's */
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/* Turn on interrupts */
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outb(UART_IER_RLSI | UART_IER_RDI | UART_IER_THRI, iobase + UART_IER);
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spin_unlock_irqrestore(&(info->lock), flags);
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}
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/* ======================== HCI interface ======================== */
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static int btuart_hci_flush(struct hci_dev *hdev)
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{
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btuart_info_t *info = hci_get_drvdata(hdev);
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/* Drop TX queue */
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skb_queue_purge(&(info->txq));
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return 0;
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}
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static int btuart_hci_open(struct hci_dev *hdev)
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{
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set_bit(HCI_RUNNING, &(hdev->flags));
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return 0;
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}
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static int btuart_hci_close(struct hci_dev *hdev)
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{
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if (!test_and_clear_bit(HCI_RUNNING, &(hdev->flags)))
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return 0;
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btuart_hci_flush(hdev);
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return 0;
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}
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static int btuart_hci_send_frame(struct sk_buff *skb)
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{
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btuart_info_t *info;
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struct hci_dev *hdev = (struct hci_dev *)(skb->dev);
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if (!hdev) {
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BT_ERR("Frame for unknown HCI device (hdev=NULL)");
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return -ENODEV;
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}
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info = hci_get_drvdata(hdev);
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switch (bt_cb(skb)->pkt_type) {
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case HCI_COMMAND_PKT:
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hdev->stat.cmd_tx++;
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break;
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case HCI_ACLDATA_PKT:
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hdev->stat.acl_tx++;
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break;
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case HCI_SCODATA_PKT:
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hdev->stat.sco_tx++;
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break;
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}
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/* Prepend skb with frame type */
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memcpy(skb_push(skb, 1), &bt_cb(skb)->pkt_type, 1);
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skb_queue_tail(&(info->txq), skb);
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btuart_write_wakeup(info);
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return 0;
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}
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static int btuart_hci_ioctl(struct hci_dev *hdev, unsigned int cmd, unsigned long arg)
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{
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return -ENOIOCTLCMD;
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}
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/* ======================== Card services HCI interaction ======================== */
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static int btuart_open(btuart_info_t *info)
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{
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unsigned long flags;
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unsigned int iobase = info->p_dev->resource[0]->start;
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struct hci_dev *hdev;
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spin_lock_init(&(info->lock));
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skb_queue_head_init(&(info->txq));
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info->rx_state = RECV_WAIT_PACKET_TYPE;
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info->rx_count = 0;
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info->rx_skb = NULL;
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/* Initialize HCI device */
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hdev = hci_alloc_dev();
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if (!hdev) {
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BT_ERR("Can't allocate HCI device");
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return -ENOMEM;
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}
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info->hdev = hdev;
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hdev->bus = HCI_PCCARD;
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hci_set_drvdata(hdev, info);
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SET_HCIDEV_DEV(hdev, &info->p_dev->dev);
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hdev->open = btuart_hci_open;
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hdev->close = btuart_hci_close;
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hdev->flush = btuart_hci_flush;
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hdev->send = btuart_hci_send_frame;
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hdev->ioctl = btuart_hci_ioctl;
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spin_lock_irqsave(&(info->lock), flags);
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/* Reset UART */
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outb(0, iobase + UART_MCR);
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/* Turn off interrupts */
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outb(0, iobase + UART_IER);
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/* Initialize UART */
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outb(UART_LCR_WLEN8, iobase + UART_LCR); /* Reset DLAB */
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outb((UART_MCR_DTR | UART_MCR_RTS | UART_MCR_OUT2), iobase + UART_MCR);
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/* Turn on interrupts */
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// outb(UART_IER_RLSI | UART_IER_RDI | UART_IER_THRI, iobase + UART_IER);
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spin_unlock_irqrestore(&(info->lock), flags);
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btuart_change_speed(info, DEFAULT_BAUD_RATE);
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/* Timeout before it is safe to send the first HCI packet */
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msleep(1000);
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/* Register HCI device */
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if (hci_register_dev(hdev) < 0) {
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BT_ERR("Can't register HCI device");
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info->hdev = NULL;
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hci_free_dev(hdev);
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return -ENODEV;
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}
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return 0;
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}
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static int btuart_close(btuart_info_t *info)
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{
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unsigned long flags;
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unsigned int iobase = info->p_dev->resource[0]->start;
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struct hci_dev *hdev = info->hdev;
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if (!hdev)
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return -ENODEV;
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btuart_hci_close(hdev);
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spin_lock_irqsave(&(info->lock), flags);
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/* Reset UART */
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outb(0, iobase + UART_MCR);
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/* Turn off interrupts */
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outb(0, iobase + UART_IER);
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spin_unlock_irqrestore(&(info->lock), flags);
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hci_unregister_dev(hdev);
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hci_free_dev(hdev);
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|
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return 0;
|
|
}
|
|
|
|
static int btuart_probe(struct pcmcia_device *link)
|
|
{
|
|
btuart_info_t *info;
|
|
|
|
/* Create new info device */
|
|
info = devm_kzalloc(&link->dev, sizeof(*info), GFP_KERNEL);
|
|
if (!info)
|
|
return -ENOMEM;
|
|
|
|
info->p_dev = link;
|
|
link->priv = info;
|
|
|
|
link->config_flags |= CONF_ENABLE_IRQ | CONF_AUTO_SET_VPP |
|
|
CONF_AUTO_SET_IO;
|
|
|
|
return btuart_config(link);
|
|
}
|
|
|
|
|
|
static void btuart_detach(struct pcmcia_device *link)
|
|
{
|
|
btuart_release(link);
|
|
}
|
|
|
|
static int btuart_check_config(struct pcmcia_device *p_dev, void *priv_data)
|
|
{
|
|
int *try = priv_data;
|
|
|
|
if (!try)
|
|
p_dev->io_lines = 16;
|
|
|
|
if ((p_dev->resource[0]->end != 8) || (p_dev->resource[0]->start == 0))
|
|
return -EINVAL;
|
|
|
|
p_dev->resource[0]->end = 8;
|
|
p_dev->resource[0]->flags &= ~IO_DATA_PATH_WIDTH;
|
|
p_dev->resource[0]->flags |= IO_DATA_PATH_WIDTH_8;
|
|
|
|
return pcmcia_request_io(p_dev);
|
|
}
|
|
|
|
static int btuart_check_config_notpicky(struct pcmcia_device *p_dev,
|
|
void *priv_data)
|
|
{
|
|
static unsigned int base[5] = { 0x3f8, 0x2f8, 0x3e8, 0x2e8, 0x0 };
|
|
int j;
|
|
|
|
if (p_dev->io_lines > 3)
|
|
return -ENODEV;
|
|
|
|
p_dev->resource[0]->flags &= ~IO_DATA_PATH_WIDTH;
|
|
p_dev->resource[0]->flags |= IO_DATA_PATH_WIDTH_8;
|
|
p_dev->resource[0]->end = 8;
|
|
|
|
for (j = 0; j < 5; j++) {
|
|
p_dev->resource[0]->start = base[j];
|
|
p_dev->io_lines = base[j] ? 16 : 3;
|
|
if (!pcmcia_request_io(p_dev))
|
|
return 0;
|
|
}
|
|
return -ENODEV;
|
|
}
|
|
|
|
static int btuart_config(struct pcmcia_device *link)
|
|
{
|
|
btuart_info_t *info = link->priv;
|
|
int i;
|
|
int try;
|
|
|
|
/* First pass: look for a config entry that looks normal.
|
|
Two tries: without IO aliases, then with aliases */
|
|
for (try = 0; try < 2; try++)
|
|
if (!pcmcia_loop_config(link, btuart_check_config, &try))
|
|
goto found_port;
|
|
|
|
/* Second pass: try to find an entry that isn't picky about
|
|
its base address, then try to grab any standard serial port
|
|
address, and finally try to get any free port. */
|
|
if (!pcmcia_loop_config(link, btuart_check_config_notpicky, NULL))
|
|
goto found_port;
|
|
|
|
BT_ERR("No usable port range found");
|
|
goto failed;
|
|
|
|
found_port:
|
|
i = pcmcia_request_irq(link, btuart_interrupt);
|
|
if (i != 0)
|
|
goto failed;
|
|
|
|
i = pcmcia_enable_device(link);
|
|
if (i != 0)
|
|
goto failed;
|
|
|
|
if (btuart_open(info) != 0)
|
|
goto failed;
|
|
|
|
return 0;
|
|
|
|
failed:
|
|
btuart_release(link);
|
|
return -ENODEV;
|
|
}
|
|
|
|
|
|
static void btuart_release(struct pcmcia_device *link)
|
|
{
|
|
btuart_info_t *info = link->priv;
|
|
|
|
btuart_close(info);
|
|
|
|
pcmcia_disable_device(link);
|
|
}
|
|
|
|
static const struct pcmcia_device_id btuart_ids[] = {
|
|
/* don't use this driver. Use serial_cs + hci_uart instead */
|
|
PCMCIA_DEVICE_NULL
|
|
};
|
|
MODULE_DEVICE_TABLE(pcmcia, btuart_ids);
|
|
|
|
static struct pcmcia_driver btuart_driver = {
|
|
.owner = THIS_MODULE,
|
|
.name = "btuart_cs",
|
|
.probe = btuart_probe,
|
|
.remove = btuart_detach,
|
|
.id_table = btuart_ids,
|
|
};
|
|
module_pcmcia_driver(btuart_driver);
|