hci_usb.c
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上传日期:2013-02-24
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- /*
- BlueZ - Bluetooth protocol stack for Linux
- Copyright (C) 2000-2001 Qualcomm Incorporated
- Written 2000,2001 by Maxim Krasnyansky <maxk@qualcomm.com>
- This program is free software; you can redistribute it and/or modify
- it under the terms of the GNU General Public License version 2 as
- published by the Free Software Foundation;
- THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
- OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
- FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT OF THIRD PARTY RIGHTS.
- IN NO EVENT SHALL THE COPYRIGHT HOLDER(S) AND AUTHOR(S) BE LIABLE FOR ANY
- CLAIM, OR ANY SPECIAL INDIRECT OR CONSEQUENTIAL DAMAGES, OR ANY DAMAGES
- WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
- ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
- OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
- ALL LIABILITY, INCLUDING LIABILITY FOR INFRINGEMENT OF ANY PATENTS,
- COPYRIGHTS, TRADEMARKS OR OTHER RIGHTS, RELATING TO USE OF THIS
- SOFTWARE IS DISCLAIMED.
- */
- /*
- * BlueZ HCI USB driver.
- * Based on original USB Bluetooth driver for Linux kernel
- * Copyright (c) 2000 Greg Kroah-Hartman <greg@kroah.com>
- * Copyright (c) 2000 Mark Douglas Corner <mcorner@umich.edu>
- *
- * $Id: hci_usb.c,v 1.5 2001/07/05 18:42:44 maxk Exp $
- */
- #define VERSION "1.0"
- #include <linux/config.h>
- #include <linux/module.h>
- #include <linux/version.h>
- #include <linux/config.h>
- #include <linux/kernel.h>
- #include <linux/init.h>
- #include <linux/sched.h>
- #include <linux/types.h>
- #include <linux/fcntl.h>
- #include <linux/interrupt.h>
- #include <linux/ptrace.h>
- #include <linux/poll.h>
- #include <linux/slab.h>
- #include <linux/tty.h>
- #include <linux/errno.h>
- #include <linux/string.h>
- #include <linux/signal.h>
- #include <linux/ioctl.h>
- #include <linux/skbuff.h>
- #include <linux/usb.h>
- #include <net/bluetooth/bluetooth.h>
- #include <net/bluetooth/bluez.h>
- #include <net/bluetooth/hci_core.h>
- #include <net/bluetooth/hci_usb.h>
- #ifndef HCI_USB_DEBUG
- #undef DBG
- #define DBG( A... )
- #undef DMP
- #define DMP( A... )
- #endif
- static struct usb_device_id usb_bluetooth_ids [] = {
- { USB_DEVICE_INFO(HCI_DEV_CLASS, HCI_DEV_SUBCLASS, HCI_DEV_PROTOCOL) },
- { } /* Terminating entry */
- };
- MODULE_DEVICE_TABLE (usb, usb_bluetooth_ids);
- static int hci_usb_ctrl_msg(struct hci_usb *husb, struct sk_buff *skb);
- static int hci_usb_write_msg(struct hci_usb *husb, struct sk_buff *skb);
- static void hci_usb_unlink_urbs(struct hci_usb *husb)
- {
- usb_unlink_urb(husb->read_urb);
- usb_unlink_urb(husb->intr_urb);
- usb_unlink_urb(husb->ctrl_urb);
- usb_unlink_urb(husb->write_urb);
- }
- static void hci_usb_free_bufs(struct hci_usb *husb)
- {
- if (husb->read_urb) {
- if (husb->read_urb->transfer_buffer)
- kfree(husb->read_urb->transfer_buffer);
- usb_free_urb(husb->read_urb);
- }
- if (husb->intr_urb) {
- if (husb->intr_urb->transfer_buffer)
- kfree(husb->intr_urb->transfer_buffer);
- usb_free_urb(husb->intr_urb);
- }
- if (husb->ctrl_urb)
- usb_free_urb(husb->ctrl_urb);
- if (husb->write_urb)
- usb_free_urb(husb->write_urb);
- if (husb->intr_skb)
- kfree_skb(husb->intr_skb);
- }
- /* ------- Interface to HCI layer ------ */
- /* Initialize device */
- int hci_usb_open(struct hci_dev *hdev)
- {
- struct hci_usb *husb = (struct hci_usb *) hdev->driver_data;
- int status;
- DBG("%s", hdev->name);
- husb->read_urb->dev = husb->udev;
- if ((status = usb_submit_urb(husb->read_urb)))
- DBG("read submit failed. %d", status);
- husb->intr_urb->dev = husb->udev;
- if ((status = usb_submit_urb(husb->intr_urb)))
- DBG("interrupt submit failed. %d", status);
- hdev->flags |= HCI_RUNNING;
- return 0;
- }
- /* Reset device */
- int hci_usb_flush(struct hci_dev *hdev)
- {
- struct hci_usb *husb = (struct hci_usb *) hdev->driver_data;
- DBG("%s", hdev->name);
- /* Drop TX queues */
- skb_queue_purge(&husb->tx_ctrl_q);
- skb_queue_purge(&husb->tx_write_q);
- return 0;
- }
- /* Close device */
- int hci_usb_close(struct hci_dev *hdev)
- {
- struct hci_usb *husb = (struct hci_usb *) hdev->driver_data;
- DBG("%s", hdev->name);
- hdev->flags &= ~HCI_RUNNING;
- hci_usb_unlink_urbs(husb);
- hci_usb_flush(hdev);
- return 0;
- }
- void hci_usb_ctrl_wakeup(struct hci_usb *husb)
- {
- struct sk_buff *skb;
- if (test_and_set_bit(HCI_TX_CTRL, &husb->tx_state))
- return;
- DBG("%s", husb->hdev.name);
- if (!(skb = skb_dequeue(&husb->tx_ctrl_q)))
- goto done;
- if (hci_usb_ctrl_msg(husb, skb)){
- kfree_skb(skb);
- goto done;
- }
- DMP(skb->data, skb->len);
- husb->hdev.stat.byte_tx += skb->len;
- return;
- done:
- clear_bit(HCI_TX_CTRL, &husb->tx_state);
- return;
- }
- void hci_usb_write_wakeup(struct hci_usb *husb)
- {
- struct sk_buff *skb;
- if (test_and_set_bit(HCI_TX_WRITE, &husb->tx_state))
- return;
- DBG("%s", husb->hdev.name);
- if (!(skb = skb_dequeue(&husb->tx_write_q)))
- goto done;
- if (hci_usb_write_msg(husb, skb)) {
- skb_queue_head(&husb->tx_write_q, skb);
- goto done;
- }
- DMP(skb->data, skb->len);
- husb->hdev.stat.byte_tx += skb->len;
- return;
- done:
- clear_bit(HCI_TX_WRITE, &husb->tx_state);
- return;
- }
- /* Send frames from HCI layer */
- int hci_usb_send_frame(struct sk_buff *skb)
- {
- struct hci_dev *hdev = (struct hci_dev *) skb->dev;
- struct hci_usb *husb;
- if (!hdev) {
- ERR("frame for uknown device (hdev=NULL)");
- return -ENODEV;
- }
- if (!(hdev->flags & HCI_RUNNING))
- return 0;
- husb = (struct hci_usb *) hdev->driver_data;
- DBG("%s type %d len %d", hdev->name, skb->pkt_type, skb->len);
- switch (skb->pkt_type) {
- case HCI_COMMAND_PKT:
- skb_queue_tail(&husb->tx_ctrl_q, skb);
- hci_usb_ctrl_wakeup(husb);
- hdev->stat.cmd_tx++;
- return 0;
- case HCI_ACLDATA_PKT:
- skb_queue_tail(&husb->tx_write_q, skb);
- hci_usb_write_wakeup(husb);
- hdev->stat.acl_tx++;
- return 0;
- case HCI_SCODATA_PKT:
- return -EOPNOTSUPP;
- };
- return 0;
- }
- /* ---------- USB ------------- */
- static void hci_usb_ctrl(struct urb *urb)
- {
- struct sk_buff *skb = (struct sk_buff *) urb->context;
- struct hci_dev *hdev;
- struct hci_usb *husb;
- if (!skb)
- return;
- hdev = (struct hci_dev *) skb->dev;
- husb = (struct hci_usb *) hdev->driver_data;
- DBG("%s", hdev->name);
- if (urb->status)
- DBG("%s ctrl status: %d", hdev->name, urb->status);
- clear_bit(HCI_TX_CTRL, &husb->tx_state);
- kfree_skb(skb);
- /* Wake up device */
- hci_usb_ctrl_wakeup(husb);
- }
- static void hci_usb_bulk_write(struct urb *urb)
- {
- struct sk_buff *skb = (struct sk_buff *) urb->context;
- struct hci_dev *hdev;
- struct hci_usb *husb;
- if (!skb)
- return;
- hdev = (struct hci_dev *) skb->dev;
- husb = (struct hci_usb *) hdev->driver_data;
- DBG("%s", hdev->name);
- if (urb->status)
- DBG("%s bulk write status: %d", hdev->name, urb->status);
- clear_bit(HCI_TX_WRITE, &husb->tx_state);
- kfree_skb(skb);
- /* Wake up device */
- hci_usb_write_wakeup(husb);
- return;
- }
- static void hci_usb_intr(struct urb *urb)
- {
- struct hci_usb *husb = (struct hci_usb *) urb->context;
- unsigned char *data = urb->transfer_buffer;
- register int count = urb->actual_length;
- register struct sk_buff *skb = husb->intr_skb;
- hci_event_hdr *eh;
- register int len;
- if (!husb)
- return;
- DBG("%s count %d", husb->hdev.name, count);
- if (urb->status || !count) {
- DBG("%s intr status %d, count %d", husb->hdev.name, urb->status, count);
- return;
- }
- /* Do we really have to handle continuations here ? */
- if (!skb) {
- /* New frame */
- if (count < HCI_EVENT_HDR_SIZE) {
- DBG("%s bad frame len %d", husb->hdev.name, count);
- return;
- }
- eh = (hci_event_hdr *) data;
- len = eh->plen + HCI_EVENT_HDR_SIZE;
- if (count > len) {
- DBG("%s corrupted frame, len %d", husb->hdev.name, count);
- return;
- }
- /* Allocate skb */
- if (!(skb = bluez_skb_alloc(len, GFP_ATOMIC))) {
- ERR("Can't allocate mem for new packet");
- return;
- }
- skb->dev = (void *) &husb->hdev;
- skb->pkt_type = HCI_EVENT_PKT;
- husb->intr_skb = skb;
- husb->intr_count = len;
- } else {
- /* Continuation */
- if (count > husb->intr_count) {
- ERR("%s bad frame len %d (expected %d)", husb->hdev.name, count, husb->intr_count);
- kfree_skb(skb);
- husb->intr_skb = NULL;
- husb->intr_count = 0;
- return;
- }
- }
- memcpy(skb_put(skb, count), data, count);
- husb->intr_count -= count;
- DMP(data, count);
- if (!husb->intr_count) {
- /* Got complete frame */
- husb->hdev.stat.byte_rx += skb->len;
- hci_recv_frame(skb);
- husb->intr_skb = NULL;
- }
- }
- static void hci_usb_bulk_read(struct urb *urb)
- {
- struct hci_usb *husb = (struct hci_usb *) urb->context;
- unsigned char *data = urb->transfer_buffer;
- int count = urb->actual_length, status;
- struct sk_buff *skb;
- hci_acl_hdr *ah;
- register __u16 dlen;
- if (!husb)
- return;
- DBG("%s status %d, count %d, flags %x", husb->hdev.name, urb->status, count, urb->transfer_flags);
- if (urb->status) {
- /* Do not re-submit URB on critical errors */
- switch (urb->status) {
- case -ENOENT:
- return;
- default:
- goto resubmit;
- };
- }
- if (!count)
- goto resubmit;
- DMP(data, count);
- ah = (hci_acl_hdr *) data;
- dlen = le16_to_cpu(ah->dlen);
- /* Verify frame len and completeness */
- if ((count - HCI_ACL_HDR_SIZE) != dlen) {
- ERR("%s corrupted ACL packet: count %d, plen %d", husb->hdev.name, count, dlen);
- goto resubmit;
- }
- /* Allocate packet */
- if (!(skb = bluez_skb_alloc(count, GFP_ATOMIC))) {
- ERR("Can't allocate mem for new packet");
- goto resubmit;
- }
- memcpy(skb_put(skb, count), data, count);
- skb->dev = (void *) &husb->hdev;
- skb->pkt_type = HCI_ACLDATA_PKT;
- husb->hdev.stat.byte_rx += skb->len;
- hci_recv_frame(skb);
- resubmit:
- husb->read_urb->dev = husb->udev;
- if ((status = usb_submit_urb(husb->read_urb)))
- DBG("%s read URB submit failed %d", husb->hdev.name, status);
- DBG("%s read URB re-submited", husb->hdev.name);
- }
- static int hci_usb_ctrl_msg(struct hci_usb *husb, struct sk_buff *skb)
- {
- struct urb *urb = husb->ctrl_urb;
- devrequest *dr = &husb->dev_req;
- int pipe, status;
- DBG("%s len %d", husb->hdev.name, skb->len);
- pipe = usb_sndctrlpipe(husb->udev, 0);
- dr->requesttype = HCI_CTRL_REQ;
- dr->request = 0;
- dr->index = 0;
- dr->value = 0;
- dr->length = cpu_to_le16(skb->len);
- FILL_CONTROL_URB(urb, husb->udev, pipe, (void*)dr, skb->data, skb->len,
- hci_usb_ctrl, skb);
- if ((status = usb_submit_urb(urb))) {
- DBG("%s control URB submit failed %d", husb->hdev.name, status);
- return status;
- }
- return 0;
- }
- static int hci_usb_write_msg(struct hci_usb *husb, struct sk_buff *skb)
- {
- struct urb *urb = husb->write_urb;
- int pipe, status;
- DBG("%s len %d", husb->hdev.name, skb->len);
- pipe = usb_sndbulkpipe(husb->udev, husb->bulk_out_ep_addr);
- FILL_BULK_URB(urb, husb->udev, pipe, skb->data, skb->len,
- hci_usb_bulk_write, skb);
- urb->transfer_flags |= USB_QUEUE_BULK;
- if ((status = usb_submit_urb(urb))) {
- DBG("%s write URB submit failed %d", husb->hdev.name, status);
- return status;
- }
- return 0;
- }
- static void * hci_usb_probe(struct usb_device *udev, unsigned int ifnum, const struct usb_device_id *id)
- {
- struct usb_endpoint_descriptor *bulk_out_ep, *intr_in_ep, *bulk_in_ep;
- struct usb_interface_descriptor *uif;
- struct usb_endpoint_descriptor *ep;
- struct hci_usb *husb;
- struct hci_dev *hdev;
- int i, size, pipe;
- __u8 * buf;
- DBG("udev %p ifnum %d", udev, ifnum);
- /* Check device signature */
- if ((udev->descriptor.bDeviceClass != HCI_DEV_CLASS) ||
- (udev->descriptor.bDeviceSubClass != HCI_DEV_SUBCLASS)||
- (udev->descriptor.bDeviceProtocol != HCI_DEV_PROTOCOL) )
- return NULL;
- MOD_INC_USE_COUNT;
- uif = &udev->actconfig->interface[ifnum].altsetting[0];
- if (uif->bNumEndpoints != 3) {
- DBG("Wrong number of endpoints %d", uif->bNumEndpoints);
- MOD_DEC_USE_COUNT;
- return NULL;
- }
- bulk_out_ep = intr_in_ep = bulk_in_ep = NULL;
- /* Find endpoints that we need */
- for ( i = 0; i < uif->bNumEndpoints; ++i) {
- ep = &uif->endpoint[i];
- switch (ep->bmAttributes & USB_ENDPOINT_XFERTYPE_MASK) {
- case USB_ENDPOINT_XFER_BULK:
- if (ep->bEndpointAddress & USB_DIR_IN)
- bulk_in_ep = ep;
- else
- bulk_out_ep = ep;
- break;
- case USB_ENDPOINT_XFER_INT:
- intr_in_ep = ep;
- break;
- };
- }
- if (!bulk_in_ep || !bulk_out_ep || !intr_in_ep) {
- DBG("Endpoints not found: %p %p %p", bulk_in_ep, bulk_out_ep, intr_in_ep);
- MOD_DEC_USE_COUNT;
- return NULL;
- }
- if (!(husb = kmalloc(sizeof(struct hci_usb), GFP_KERNEL))) {
- ERR("Can't allocate: control structure");
- MOD_DEC_USE_COUNT;
- return NULL;
- }
- memset(husb, 0, sizeof(struct hci_usb));
- husb->udev = udev;
- husb->bulk_out_ep_addr = bulk_out_ep->bEndpointAddress;
- if (!(husb->ctrl_urb = usb_alloc_urb(0))) {
- ERR("Can't allocate: control URB");
- goto probe_error;
- }
- if (!(husb->write_urb = usb_alloc_urb(0))) {
- ERR("Can't allocate: write URB");
- goto probe_error;
- }
- if (!(husb->read_urb = usb_alloc_urb(0))) {
- ERR("Can't allocate: read URB");
- goto probe_error;
- }
- ep = bulk_in_ep;
- pipe = usb_rcvbulkpipe(udev, ep->bEndpointAddress);
- size = HCI_MAX_FRAME_SIZE;
- if (!(buf = kmalloc(size, GFP_KERNEL))) {
- ERR("Can't allocate: read buffer");
- goto probe_error;
- }
- FILL_BULK_URB(husb->read_urb, udev, pipe, buf, size, hci_usb_bulk_read, husb);
- husb->read_urb->transfer_flags |= USB_QUEUE_BULK;
- ep = intr_in_ep;
- pipe = usb_rcvintpipe(udev, ep->bEndpointAddress);
- size = usb_maxpacket(udev, pipe, usb_pipeout(pipe));
- if (!(husb->intr_urb = usb_alloc_urb(0))) {
- ERR("Can't allocate: interrupt URB");
- goto probe_error;
- }
- if (!(buf = kmalloc(size, GFP_KERNEL))) {
- ERR("Can't allocate: interrupt buffer");
- goto probe_error;
- }
- FILL_INT_URB(husb->intr_urb, udev, pipe, buf, size, hci_usb_intr, husb, ep->bInterval);
- skb_queue_head_init(&husb->tx_ctrl_q);
- skb_queue_head_init(&husb->tx_write_q);
- /* Initialize and register HCI device */
- hdev = &husb->hdev;
- hdev->type = HCI_USB;
- hdev->driver_data = husb;
- hdev->open = hci_usb_open;
- hdev->close = hci_usb_close;
- hdev->flush = hci_usb_flush;
- hdev->send = hci_usb_send_frame;
- if (hci_register_dev(hdev) < 0) {
- ERR("Can't register HCI device %s", hdev->name);
- goto probe_error;
- }
- return husb;
- probe_error:
- hci_usb_free_bufs(husb);
- kfree(husb);
- MOD_DEC_USE_COUNT;
- return NULL;
- }
- static void hci_usb_disconnect(struct usb_device *udev, void *ptr)
- {
- struct hci_usb *husb = (struct hci_usb *) ptr;
- struct hci_dev *hdev = &husb->hdev;
- if (!husb)
- return;
- DBG("%s", hdev->name);
- hci_usb_close(hdev);
- if (hci_unregister_dev(hdev) < 0) {
- ERR("Can't unregister HCI device %s", hdev->name);
- }
- hci_usb_free_bufs(husb);
- kfree(husb);
- MOD_DEC_USE_COUNT;
- }
- static struct usb_driver hci_usb_driver =
- {
- name: "hci_usb",
- probe: hci_usb_probe,
- disconnect: hci_usb_disconnect,
- id_table: usb_bluetooth_ids,
- };
- int hci_usb_init(void)
- {
- int err;
- INF("BlueZ HCI USB driver ver %s Copyright (C) 2000,2001 Qualcomm Inc",
- VERSION);
- INF("Written 2000,2001 by Maxim Krasnyansky <maxk@qualcomm.com>");
- if ((err = usb_register(&hci_usb_driver)) < 0)
- ERR("Failed to register HCI USB driver");
- return err;
- }
- void hci_usb_cleanup(void)
- {
- usb_deregister(&hci_usb_driver);
- }
- module_init(hci_usb_init);
- module_exit(hci_usb_cleanup);
- MODULE_AUTHOR("Maxim Krasnyansky <maxk@qualcomm.com>");
- MODULE_DESCRIPTION("BlueZ HCI USB driver ver " VERSION);
- MODULE_LICENSE("GPL");