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linux/drivers/usb/class/bluetty.c
Jesper Juhl 1bc3c9e1e4 [PATCH] USB: kfree cleanup for drivers/usb/* - no need to check for NULL 
Get rid of a bunch of redundant NULL pointer checks in drivers/usb/*,
there's no need to check a pointer for NULL before calling kfree() on it.

Signed-off-by: Jesper Juhl <juhl-lkml@dif.dk>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>


Index: gregkh-2.6/drivers/usb/class/audio.c
===================================================================
2005-04-18 17:39:34 -07:00

1280 lines
36 KiB
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/*
* bluetty.c Version 0.13
*
* Copyright (C) 2000, 2001 Greg Kroah-Hartman <greg@kroah.com>
* Copyright (C) 2000 Mark Douglas Corner <mcorner@umich.edu>
*
* USB Bluetooth TTY driver, based on the Bluetooth Spec version 1.0B
*
* (2001/11/30) Version 0.13 gkh
* - added locking patch from Masoodur Rahman <rmasoodu@in.ibm.com>
* - removed active variable, as open_count will do.
*
* (2001/07/09) Version 0.12 gkh
* - removed in_interrupt() call, as it doesn't make sense to do
* that anymore.
*
* (2001/06/05) Version 0.11 gkh
* - Fixed problem with read urb status saying that we have shutdown,
* and that we shouldn't resubmit the urb. Patch from unknown.
*
* (2001/05/28) Version 0.10 gkh
* - Fixed problem with using data from userspace in the bluetooth_write
* function as found by the CHECKER project.
* - Added a buffer to the write_urb_pool which reduces the number of
* buffers being created and destroyed for ever write. Also cleans
* up the logic a bit.
* - Added a buffer to the control_urb_pool which fixes a memory leak
* when the device is removed from the system.
*
* (2001/05/28) Version 0.9 gkh
* Fixed problem with bluetooth==NULL for bluetooth_read_bulk_callback
* which was found by both the CHECKER project and Mikko Rahkonen.
*
* (08/04/2001) gb
* Identify version on module load.
*
* (2001/03/10) Version 0.8 gkh
* Fixed problem with not unlinking interrupt urb on device close
* and resubmitting the read urb on error with bluetooth struct.
* Thanks to Narayan Mohanram <narayan@RovingNetworks.com> for the
* fixes.
*
* (11/29/2000) Version 0.7 gkh
* Fixed problem with overrunning the tty flip buffer.
* Removed unneeded NULL pointer initialization.
*
* (10/05/2000) Version 0.6 gkh
* Fixed bug with urb->dev not being set properly, now that the usb
* core needs it.
* Got a real major id number and name.
*
* (08/06/2000) Version 0.5 gkh
* Fixed problem of not resubmitting the bulk read urb if there is
* an error in the callback. Ericsson devices seem to need this.
*
* (07/11/2000) Version 0.4 gkh
* Fixed bug in disconnect for when we call tty_hangup
* Fixed bug in bluetooth_ctrl_msg where the bluetooth struct was not
* getting attached to the control urb properly.
* Fixed bug in bluetooth_write where we pay attention to the result
* of bluetooth_ctrl_msg.
*
* (08/03/2000) Version 0.3 gkh mdc
* Merged in Mark's changes to make the driver play nice with the Axis
* stack.
* Made the write bulk use an urb pool to enable larger transfers with
* fewer calls to the driver.
* Fixed off by one bug in acl pkt receive
* Made packet counters specific to each bluetooth device
* Added checks for zero length callbacks
* Added buffers for int and bulk packets. Had to do this otherwise
* packet types could intermingle.
* Made a control urb pool for the control messages.
*
* (07/11/2000) Version 0.2 gkh
* Fixed a small bug found by Nils Faerber in the usb_bluetooth_probe
* function.
*
* (07/09/2000) Version 0.1 gkh
* Initial release. Has support for sending ACL data (which is really just
* a HCI frame.) Raw HCI commands and HCI events are not supported.
* A ioctl will probably be needed for the HCI commands and events in the
* future. All isoch endpoints are ignored at this time also.
* This driver should work for all currently shipping USB Bluetooth
* devices at this time :)
*
*/
/*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#include <linux/kernel.h>
#include <linux/errno.h>
#include <linux/init.h>
#include <linux/slab.h>
#include <linux/tty.h>
#include <linux/tty_driver.h>
#include <linux/tty_flip.h>
#include <linux/module.h>
#include <asm/uaccess.h>
#define DEBUG
#include <linux/usb.h>
/*
* Version Information
*/
#define DRIVER_VERSION "v0.13"
#define DRIVER_AUTHOR "Greg Kroah-Hartman, Mark Douglas Corner"
#define DRIVER_DESC "USB Bluetooth tty driver"
/* define this if you have hardware that is not good */
/*#define BTBUGGYHARDWARE */
/* Class, SubClass, and Protocol codes that describe a Bluetooth device */
#define WIRELESS_CLASS_CODE 0xe0
#define RF_SUBCLASS_CODE 0x01
#define BLUETOOTH_PROGRAMMING_PROTOCOL_CODE 0x01
#define BLUETOOTH_TTY_MAJOR 216 /* real device node major id */
#define BLUETOOTH_TTY_MINORS 256 /* whole lotta bluetooth devices */
#define USB_BLUETOOTH_MAGIC 0x6d02 /* magic number for bluetooth struct */
#define BLUETOOTH_CONTROL_REQUEST_TYPE 0x20
/* Bluetooth packet types */
#define CMD_PKT 0x01
#define ACL_PKT 0x02
#define SCO_PKT 0x03
#define EVENT_PKT 0x04
#define ERROR_PKT 0x05
#define NEG_PKT 0x06
/* Message sizes */
#define MAX_EVENT_SIZE 0xFF
#define EVENT_HDR_SIZE 3 /* 2 for the header + 1 for the type indicator */
#define EVENT_BUFFER_SIZE (MAX_EVENT_SIZE + EVENT_HDR_SIZE)
#define MAX_ACL_SIZE 0xFFFF
#define ACL_HDR_SIZE 5 /* 4 for the header + 1 for the type indicator */
#define ACL_BUFFER_SIZE (MAX_ACL_SIZE + ACL_HDR_SIZE)
/* parity check flag */
#define RELEVANT_IFLAG(iflag) (iflag & (IGNBRK|BRKINT|IGNPAR|PARMRK|INPCK))
#define CHAR2INT16(c1,c0) (((u32)((c1) & 0xff) << 8) + (u32)((c0) & 0xff))
#define NUM_BULK_URBS 24
#define NUM_CONTROL_URBS 16
struct usb_bluetooth {
int magic;
struct usb_device * dev;
struct tty_driver * tty_driver; /* the tty_driver for this device */
struct tty_struct * tty; /* the corresponding tty for this port */
unsigned char minor; /* the starting minor number for this device */
int throttle; /* throttled by tty layer */
int open_count;
__u8 control_out_bInterfaceNum;
struct urb * control_urb_pool[NUM_CONTROL_URBS];
struct usb_ctrlrequest dr[NUM_CONTROL_URBS];
unsigned char * interrupt_in_buffer;
struct urb * interrupt_in_urb;
__u8 interrupt_in_endpointAddress;
__u8 interrupt_in_interval;
int interrupt_in_buffer_size;
unsigned char * bulk_in_buffer;
struct urb * read_urb;
__u8 bulk_in_endpointAddress;
int bulk_in_buffer_size;
int bulk_out_buffer_size;
__u8 bulk_out_endpointAddress;
wait_queue_head_t write_wait;
struct work_struct work; /* work queue entry for line discipline waking up */
unsigned int int_packet_pos;
unsigned char int_buffer[EVENT_BUFFER_SIZE];
unsigned int bulk_packet_pos;
unsigned char bulk_buffer[ACL_BUFFER_SIZE]; /* 64k preallocated, fix? */
struct semaphore lock;
};
/* local function prototypes */
static int bluetooth_open (struct tty_struct *tty, struct file *filp);
static void bluetooth_close (struct tty_struct *tty, struct file *filp);
static int bluetooth_write (struct tty_struct *tty, const unsigned char *buf, int count);
static int bluetooth_write_room (struct tty_struct *tty);
static int bluetooth_chars_in_buffer (struct tty_struct *tty);
static void bluetooth_throttle (struct tty_struct *tty);
static void bluetooth_unthrottle (struct tty_struct *tty);
static int bluetooth_ioctl (struct tty_struct *tty, struct file *file, unsigned int cmd, unsigned long arg);
static void bluetooth_set_termios (struct tty_struct *tty, struct termios *old);
static void bluetooth_int_callback (struct urb *urb, struct pt_regs *regs);
static void bluetooth_ctrl_callback (struct urb *urb, struct pt_regs *regs);
static void bluetooth_read_bulk_callback (struct urb *urb, struct pt_regs *regs);
static void bluetooth_write_bulk_callback (struct urb *urb, struct pt_regs *regs);
static int usb_bluetooth_probe (struct usb_interface *intf,
const struct usb_device_id *id);
static void usb_bluetooth_disconnect (struct usb_interface *intf);
static struct usb_device_id usb_bluetooth_ids [] = {
{ USB_DEVICE_INFO(WIRELESS_CLASS_CODE, RF_SUBCLASS_CODE, BLUETOOTH_PROGRAMMING_PROTOCOL_CODE) },
{ } /* Terminating entry */
};
MODULE_DEVICE_TABLE (usb, usb_bluetooth_ids);
static struct usb_driver usb_bluetooth_driver = {
.owner = THIS_MODULE,
.name = "bluetty",
.probe = usb_bluetooth_probe,
.disconnect = usb_bluetooth_disconnect,
.id_table = usb_bluetooth_ids,
};
static struct tty_driver *bluetooth_tty_driver;
static struct usb_bluetooth *bluetooth_table[BLUETOOTH_TTY_MINORS];
static inline int bluetooth_paranoia_check (struct usb_bluetooth *bluetooth, const char *function)
{
if (!bluetooth) {
dbg("%s - bluetooth == NULL", function);
return -1;
}
if (bluetooth->magic != USB_BLUETOOTH_MAGIC) {
dbg("%s - bad magic number for bluetooth", function);
return -1;
}
return 0;
}
static inline struct usb_bluetooth* get_usb_bluetooth (struct usb_bluetooth *bluetooth, const char *function)
{
if (!bluetooth ||
bluetooth_paranoia_check (bluetooth, function)) {
/* then say that we don't have a valid usb_bluetooth thing, which will
* end up generating -ENODEV return values */
return NULL;
}
return bluetooth;
}
static inline struct usb_bluetooth *get_bluetooth_by_index (int index)
{
return bluetooth_table[index];
}
static int bluetooth_ctrl_msg (struct usb_bluetooth *bluetooth, int request, int value, const unsigned char *buf, int len)
{
struct urb *urb = NULL;
struct usb_ctrlrequest *dr = NULL;
int i;
int status;
dbg ("%s", __FUNCTION__);
/* try to find a free urb in our list */
for (i = 0; i < NUM_CONTROL_URBS; ++i) {
if (bluetooth->control_urb_pool[i]->status != -EINPROGRESS) {
urb = bluetooth->control_urb_pool[i];
dr = &bluetooth->dr[i];
break;
}
}
if (urb == NULL) {
dbg ("%s - no free urbs", __FUNCTION__);
return -ENOMEM;
}
/* keep increasing the urb transfer buffer to fit the size of the message */
if (urb->transfer_buffer == NULL) {
urb->transfer_buffer = kmalloc (len, GFP_KERNEL);
if (urb->transfer_buffer == NULL) {
err ("%s - out of memory", __FUNCTION__);
return -ENOMEM;
}
}
if (urb->transfer_buffer_length < len) {
kfree(urb->transfer_buffer);
urb->transfer_buffer = kmalloc (len, GFP_KERNEL);
if (urb->transfer_buffer == NULL) {
err ("%s - out of memory", __FUNCTION__);
return -ENOMEM;
}
}
memcpy (urb->transfer_buffer, buf, len);
dr->bRequestType= BLUETOOTH_CONTROL_REQUEST_TYPE;
dr->bRequest = request;
dr->wValue = cpu_to_le16((u16) value);
dr->wIndex = cpu_to_le16((u16) bluetooth->control_out_bInterfaceNum);
dr->wLength = cpu_to_le16((u16) len);
usb_fill_control_urb (urb, bluetooth->dev, usb_sndctrlpipe(bluetooth->dev, 0),
(unsigned char*)dr, urb->transfer_buffer, len, bluetooth_ctrl_callback, bluetooth);
/* send it down the pipe */
status = usb_submit_urb(urb, GFP_KERNEL);
if (status)
dbg("%s - usb_submit_urb(control) failed with status = %d", __FUNCTION__, status);
return status;
}
/*****************************************************************************
* Driver tty interface functions
*****************************************************************************/
static int bluetooth_open (struct tty_struct *tty, struct file * filp)
{
struct usb_bluetooth *bluetooth;
int result;
dbg("%s", __FUNCTION__);
/* initialize the pointer incase something fails */
tty->driver_data = NULL;
/* get the bluetooth object associated with this tty pointer */
bluetooth = get_bluetooth_by_index (tty->index);
if (bluetooth_paranoia_check (bluetooth, __FUNCTION__)) {
return -ENODEV;
}
down (&bluetooth->lock);
++bluetooth->open_count;
if (bluetooth->open_count == 1) {
/* set up our structure making the tty driver remember our object, and us it */
tty->driver_data = bluetooth;
bluetooth->tty = tty;
/* force low_latency on so that our tty_push actually forces the data through,
* otherwise it is scheduled, and with high data rates (like with OHCI) data
* can get lost. */
bluetooth->tty->low_latency = 1;
/* Reset the packet position counters */
bluetooth->int_packet_pos = 0;
bluetooth->bulk_packet_pos = 0;
#ifndef BTBUGGYHARDWARE
/* Start reading from the device */
usb_fill_bulk_urb (bluetooth->read_urb, bluetooth->dev,
usb_rcvbulkpipe(bluetooth->dev, bluetooth->bulk_in_endpointAddress),
bluetooth->bulk_in_buffer,
bluetooth->bulk_in_buffer_size,
bluetooth_read_bulk_callback, bluetooth);
result = usb_submit_urb(bluetooth->read_urb, GFP_KERNEL);
if (result)
dbg("%s - usb_submit_urb(read bulk) failed with status %d", __FUNCTION__, result);
#endif
usb_fill_int_urb (bluetooth->interrupt_in_urb, bluetooth->dev,
usb_rcvintpipe(bluetooth->dev, bluetooth->interrupt_in_endpointAddress),
bluetooth->interrupt_in_buffer,
bluetooth->interrupt_in_buffer_size,
bluetooth_int_callback, bluetooth,
bluetooth->interrupt_in_interval);
result = usb_submit_urb(bluetooth->interrupt_in_urb, GFP_KERNEL);
if (result)
dbg("%s - usb_submit_urb(interrupt in) failed with status %d", __FUNCTION__, result);
}
up(&bluetooth->lock);
return 0;
}
static void bluetooth_close (struct tty_struct *tty, struct file * filp)
{
struct usb_bluetooth *bluetooth = get_usb_bluetooth ((struct usb_bluetooth *)tty->driver_data, __FUNCTION__);
if (!bluetooth) {
return;
}
dbg("%s", __FUNCTION__);
if (!bluetooth->open_count) {
dbg ("%s - device not opened", __FUNCTION__);
return;
}
down (&bluetooth->lock);
--bluetooth->open_count;
if (bluetooth->open_count <= 0) {
bluetooth->open_count = 0;
/* shutdown any in-flight urbs that we know about */
usb_kill_urb (bluetooth->read_urb);
usb_kill_urb (bluetooth->interrupt_in_urb);
}
up(&bluetooth->lock);
}
static int bluetooth_write (struct tty_struct * tty, const unsigned char *buf, int count)
{
struct usb_bluetooth *bluetooth = get_usb_bluetooth ((struct usb_bluetooth *)tty->driver_data, __FUNCTION__);
struct urb *urb = NULL;
unsigned char *temp_buffer = NULL;
const unsigned char *current_buffer;
unsigned char *urb_buffer;
int i;
int retval = 0;
if (!bluetooth) {
return -ENODEV;
}
dbg("%s - %d byte(s)", __FUNCTION__, count);
if (!bluetooth->open_count) {
dbg ("%s - device not opened", __FUNCTION__);
return -EINVAL;
}
if (count == 0) {
dbg("%s - write request of 0 bytes", __FUNCTION__);
return 0;
}
if (count == 1) {
dbg("%s - write request only included type %d", __FUNCTION__, buf[0]);
return 1;
}
#ifdef DEBUG
printk (KERN_DEBUG __FILE__ ": %s - length = %d, data = ", __FUNCTION__, count);
for (i = 0; i < count; ++i) {
printk ("%.2x ", buf[i]);
}
printk ("\n");
#endif
current_buffer = buf;
switch (*current_buffer) {
/* First byte indicates the type of packet */
case CMD_PKT:
/* dbg("%s- Send cmd_pkt len:%d", __FUNCTION__, count);*/
retval = bluetooth_ctrl_msg (bluetooth, 0x00, 0x00, &current_buffer[1], count-1);
if (retval) {
goto exit;
}
retval = count;
break;
case ACL_PKT:
++current_buffer;
--count;
urb_buffer = kmalloc (count, GFP_ATOMIC);
if (!urb_buffer) {
dev_err(&bluetooth->dev->dev, "out of memory\n");
retval = -ENOMEM;
goto exit;
}
urb = usb_alloc_urb(0, GFP_ATOMIC);
if (!urb) {
dev_err(&bluetooth->dev->dev, "no more free urbs\n");
kfree(urb_buffer);
retval = -ENOMEM;
goto exit;
}
memcpy (urb_buffer, current_buffer, count);
/* build up our urb */
usb_fill_bulk_urb(urb, bluetooth->dev,
usb_sndbulkpipe(bluetooth->dev,
bluetooth->bulk_out_endpointAddress),
urb_buffer,
count,
bluetooth_write_bulk_callback,
bluetooth);
/* send it down the pipe */
retval = usb_submit_urb(urb, GFP_KERNEL);
if (retval) {
dbg("%s - usb_submit_urb(write bulk) failed with error = %d", __FUNCTION__, retval);
goto exit;
}
/* we are done with this urb, so let the host driver
* really free it when it is finished with it */
usb_free_urb (urb);
retval = count + 1;
break;
default :
dbg("%s - unsupported (at this time) write type", __FUNCTION__);
retval = -EINVAL;
break;
}
exit:
kfree(temp_buffer);
return retval;
}
static int bluetooth_write_room (struct tty_struct *tty)
{
dbg("%s", __FUNCTION__);
/*
* We really can take anything the user throws at us
* but let's pick a nice big number to tell the tty
* layer that we have lots of free space
*/
return 2048;
}
static int bluetooth_chars_in_buffer (struct tty_struct *tty)
{
dbg("%s", __FUNCTION__);
/*
* We can't really account for how much data we
* have sent out, but hasn't made it through to the
* device, so just tell the tty layer that everything
* is flushed.
*/
return 0;
}
static void bluetooth_throttle (struct tty_struct * tty)
{
struct usb_bluetooth *bluetooth = get_usb_bluetooth ((struct usb_bluetooth *)tty->driver_data, __FUNCTION__);
if (!bluetooth) {
return;
}
dbg("%s", __FUNCTION__);
if (!bluetooth->open_count) {
dbg ("%s - device not open", __FUNCTION__);
return;
}
dbg("%s unsupported (at this time)", __FUNCTION__);
return;
}
static void bluetooth_unthrottle (struct tty_struct * tty)
{
struct usb_bluetooth *bluetooth = get_usb_bluetooth ((struct usb_bluetooth *)tty->driver_data, __FUNCTION__);
if (!bluetooth) {
return;
}
dbg("%s", __FUNCTION__);
if (!bluetooth->open_count) {
dbg ("%s - device not open", __FUNCTION__);
return;
}
dbg("%s unsupported (at this time)", __FUNCTION__);
}
static int bluetooth_ioctl (struct tty_struct *tty, struct file * file, unsigned int cmd, unsigned long arg)
{
struct usb_bluetooth *bluetooth = get_usb_bluetooth ((struct usb_bluetooth *)tty->driver_data, __FUNCTION__);
if (!bluetooth) {
return -ENODEV;
}
dbg("%s - cmd 0x%.4x", __FUNCTION__, cmd);
if (!bluetooth->open_count) {
dbg ("%s - device not open", __FUNCTION__);
return -ENODEV;
}
/* FIXME!!! */
return -ENOIOCTLCMD;
}
static void bluetooth_set_termios (struct tty_struct *tty, struct termios * old)
{
struct usb_bluetooth *bluetooth = get_usb_bluetooth ((struct usb_bluetooth *)tty->driver_data, __FUNCTION__);
if (!bluetooth) {
return;
}
dbg("%s", __FUNCTION__);
if (!bluetooth->open_count) {
dbg ("%s - device not open", __FUNCTION__);
return;
}
/* FIXME!!! */
return;
}
#ifdef BTBUGGYHARDWARE
void btusb_enable_bulk_read(struct tty_struct *tty){
struct usb_bluetooth *bluetooth = get_usb_bluetooth ((struct usb_bluetooth *)tty->driver_data, __FUNCTION__);
int result;
if (!bluetooth) {
return;
}
dbg("%s", __FUNCTION__);
if (!bluetooth->open_count) {
dbg ("%s - device not open", __FUNCTION__);
return;
}
if (bluetooth->read_urb) {
usb_fill_bulk_urb(bluetooth->read_urb, bluetooth->dev,
usb_rcvbulkpipe(bluetooth->dev, bluetooth->bulk_in_endpointAddress),
bluetooth->bulk_in_buffer, bluetooth->bulk_in_buffer_size,
bluetooth_read_bulk_callback, bluetooth);
result = usb_submit_urb(bluetooth->read_urb, GFP_KERNEL);
if (result)
err ("%s - failed submitting read urb, error %d", __FUNCTION__, result);
}
}
void btusb_disable_bulk_read(struct tty_struct *tty){
struct usb_bluetooth *bluetooth = get_usb_bluetooth ((struct usb_bluetooth *)tty->driver_data, __FUNCTION__);
if (!bluetooth) {
return;
}
dbg("%s", __FUNCTION__);
if (!bluetooth->open_count) {
dbg ("%s - device not open", __FUNCTION__);
return;
}
if ((bluetooth->read_urb) && (bluetooth->read_urb->actual_length))
usb_kill_urb(bluetooth->read_urb);
}
#endif
/*****************************************************************************
* urb callback functions
*****************************************************************************/
static void bluetooth_int_callback (struct urb *urb, struct pt_regs *regs)
{
struct usb_bluetooth *bluetooth = get_usb_bluetooth ((struct usb_bluetooth *)urb->context, __FUNCTION__);
unsigned char *data = urb->transfer_buffer;
unsigned int i;
unsigned int count = urb->actual_length;
unsigned int packet_size;
int status;
dbg("%s", __FUNCTION__);
if (!bluetooth) {
dbg("%s - bad bluetooth pointer, exiting", __FUNCTION__);
return;
}
switch (urb->status) {
case 0:
/* success */
break;
case -ECONNRESET:
case -ENOENT:
case -ESHUTDOWN:
/* this urb is terminated, clean up */
dbg("%s - urb shutting down with status: %d", __FUNCTION__, urb->status);
return;
default:
dbg("%s - nonzero urb status received: %d", __FUNCTION__, urb->status);
goto exit;
}
if (!count) {
dbg("%s - zero length int", __FUNCTION__);
goto exit;
}
#ifdef DEBUG
if (count) {
printk (KERN_DEBUG __FILE__ ": %s- length = %d, data = ", __FUNCTION__, count);
for (i = 0; i < count; ++i) {
printk ("%.2x ", data[i]);
}
printk ("\n");
}
#endif
#ifdef BTBUGGYHARDWARE
if ((count >= 2) && (data[0] == 0xFF) && (data[1] == 0x00)) {
data += 2;
count -= 2;
}
if (count == 0) {
urb->actual_length = 0;
goto exit;
}
#endif
/* We add a packet type identifier to the beginning of each
HCI frame. This makes the data in the tty look like a
serial USB devices. Each HCI frame can be broken across
multiple URBs so we buffer them until we have a full hci
packet */
if (!bluetooth->int_packet_pos) {
bluetooth->int_buffer[0] = EVENT_PKT;
bluetooth->int_packet_pos++;
}
if (bluetooth->int_packet_pos + count > EVENT_BUFFER_SIZE) {
err("%s - exceeded EVENT_BUFFER_SIZE", __FUNCTION__);
bluetooth->int_packet_pos = 0;
goto exit;
}
memcpy (&bluetooth->int_buffer[bluetooth->int_packet_pos],
urb->transfer_buffer, count);
bluetooth->int_packet_pos += count;
urb->actual_length = 0;
if (bluetooth->int_packet_pos >= EVENT_HDR_SIZE)
packet_size = bluetooth->int_buffer[2];
else
goto exit;
if (packet_size + EVENT_HDR_SIZE < bluetooth->int_packet_pos) {
err("%s - packet was too long", __FUNCTION__);
bluetooth->int_packet_pos = 0;
goto exit;
}
if (packet_size + EVENT_HDR_SIZE == bluetooth->int_packet_pos) {
for (i = 0; i < bluetooth->int_packet_pos; ++i) {
/* if we insert more than TTY_FLIPBUF_SIZE characters, we drop them */
if (bluetooth->tty->flip.count >= TTY_FLIPBUF_SIZE) {
tty_flip_buffer_push(bluetooth->tty);
}
tty_insert_flip_char(bluetooth->tty, bluetooth->int_buffer[i], 0);
}
tty_flip_buffer_push(bluetooth->tty);
bluetooth->int_packet_pos = 0;
}
exit:
status = usb_submit_urb (urb, GFP_ATOMIC);
if (status)
err ("%s - usb_submit_urb failed with result %d",
__FUNCTION__, status);
}
static void bluetooth_ctrl_callback (struct urb *urb, struct pt_regs *regs)
{
struct usb_bluetooth *bluetooth = get_usb_bluetooth ((struct usb_bluetooth *)urb->context, __FUNCTION__);
dbg("%s", __FUNCTION__);
if (!bluetooth) {
dbg("%s - bad bluetooth pointer, exiting", __FUNCTION__);
return;
}
if (urb->status) {
dbg("%s - nonzero read bulk status received: %d", __FUNCTION__, urb->status);
return;
}
}
static void bluetooth_read_bulk_callback (struct urb *urb, struct pt_regs *regs)
{
struct usb_bluetooth *bluetooth = get_usb_bluetooth ((struct usb_bluetooth *)urb->context, __FUNCTION__);
unsigned char *data = urb->transfer_buffer;
unsigned int count = urb->actual_length;
unsigned int i;
unsigned int packet_size;
int result;
dbg("%s", __FUNCTION__);
if (!bluetooth) {
dbg("%s - bad bluetooth pointer, exiting", __FUNCTION__);
return;
}
if (urb->status) {
dbg("%s - nonzero read bulk status received: %d", __FUNCTION__, urb->status);
if (urb->status == -ENOENT) {
dbg("%s - URB canceled, won't reschedule", __FUNCTION__);
return;
}
goto exit;
}
if (!count) {
dbg("%s - zero length read bulk", __FUNCTION__);
goto exit;
}
#ifdef DEBUG
if (count) {
printk (KERN_DEBUG __FILE__ ": %s- length = %d, data = ", __FUNCTION__, count);
for (i = 0; i < count; ++i) {
printk ("%.2x ", data[i]);
}
printk ("\n");
}
#endif
#ifdef BTBUGGYHARDWARE
if ((count == 4) && (data[0] == 0x00) && (data[1] == 0x00)
&& (data[2] == 0x00) && (data[3] == 0x00)) {
urb->actual_length = 0;
usb_fill_bulk_urb(bluetooth->read_urb, bluetooth->dev,
usb_rcvbulkpipe(bluetooth->dev, bluetooth->bulk_in_endpointAddress),
bluetooth->bulk_in_buffer, bluetooth->bulk_in_buffer_size,
bluetooth_read_bulk_callback, bluetooth);
result = usb_submit_urb(bluetooth->read_urb, GFP_KERNEL);
if (result)
err ("%s - failed resubmitting read urb, error %d", __FUNCTION__, result);
return;
}
#endif
/* We add a packet type identifier to the beginning of each
HCI frame. This makes the data in the tty look like a
serial USB devices. Each HCI frame can be broken across
multiple URBs so we buffer them until we have a full hci
packet */
if (!bluetooth->bulk_packet_pos) {
bluetooth->bulk_buffer[0] = ACL_PKT;
bluetooth->bulk_packet_pos++;
}
if (bluetooth->bulk_packet_pos + count > ACL_BUFFER_SIZE) {
err("%s - exceeded ACL_BUFFER_SIZE", __FUNCTION__);
bluetooth->bulk_packet_pos = 0;
goto exit;
}
memcpy (&bluetooth->bulk_buffer[bluetooth->bulk_packet_pos],
urb->transfer_buffer, count);
bluetooth->bulk_packet_pos += count;
urb->actual_length = 0;
if (bluetooth->bulk_packet_pos >= ACL_HDR_SIZE) {
packet_size = CHAR2INT16(bluetooth->bulk_buffer[4],bluetooth->bulk_buffer[3]);
} else {
goto exit;
}
if (packet_size + ACL_HDR_SIZE < bluetooth->bulk_packet_pos) {
err("%s - packet was too long", __FUNCTION__);
bluetooth->bulk_packet_pos = 0;
goto exit;
}
if (packet_size + ACL_HDR_SIZE == bluetooth->bulk_packet_pos) {
for (i = 0; i < bluetooth->bulk_packet_pos; ++i) {
/* if we insert more than TTY_FLIPBUF_SIZE characters, we drop them. */
if (bluetooth->tty->flip.count >= TTY_FLIPBUF_SIZE) {
tty_flip_buffer_push(bluetooth->tty);
}
tty_insert_flip_char(bluetooth->tty, bluetooth->bulk_buffer[i], 0);
}
tty_flip_buffer_push(bluetooth->tty);
bluetooth->bulk_packet_pos = 0;
}
exit:
if (!bluetooth || !bluetooth->open_count)
return;
usb_fill_bulk_urb(bluetooth->read_urb, bluetooth->dev,
usb_rcvbulkpipe(bluetooth->dev, bluetooth->bulk_in_endpointAddress),
bluetooth->bulk_in_buffer, bluetooth->bulk_in_buffer_size,
bluetooth_read_bulk_callback, bluetooth);
result = usb_submit_urb(bluetooth->read_urb, GFP_KERNEL);
if (result)
err ("%s - failed resubmitting read urb, error %d", __FUNCTION__, result);
return;
}
static void bluetooth_write_bulk_callback (struct urb *urb, struct pt_regs *regs)
{
struct usb_bluetooth *bluetooth = get_usb_bluetooth ((struct usb_bluetooth *)urb->context, __FUNCTION__);
dbg("%s", __FUNCTION__);
/* free up the transfer buffer, as usb_free_urb() does not do this */
kfree(urb->transfer_buffer);
if (!bluetooth) {
dbg("%s - bad bluetooth pointer, exiting", __FUNCTION__);
return;
}
if (urb->status) {
dbg("%s - nonzero write bulk status received: %d", __FUNCTION__, urb->status);
return;
}
/* wake up our little function to let the tty layer know that something happened */
schedule_work(&bluetooth->work);
}
static void bluetooth_softint(void *private)
{
struct usb_bluetooth *bluetooth = get_usb_bluetooth ((struct usb_bluetooth *)private, __FUNCTION__);
dbg("%s", __FUNCTION__);
if (!bluetooth)
return;
tty_wakeup(bluetooth->tty);
}
static int usb_bluetooth_probe (struct usb_interface *intf,
const struct usb_device_id *id)
{
struct usb_device *dev = interface_to_usbdev (intf);
struct usb_bluetooth *bluetooth = NULL;
struct usb_host_interface *interface;
struct usb_endpoint_descriptor *endpoint;
struct usb_endpoint_descriptor *interrupt_in_endpoint[8];
struct usb_endpoint_descriptor *bulk_in_endpoint[8];
struct usb_endpoint_descriptor *bulk_out_endpoint[8];
int control_out_endpoint;
int minor;
int buffer_size;
int i;
int num_interrupt_in = 0;
int num_bulk_in = 0;
int num_bulk_out = 0;
interface = intf->cur_altsetting;
control_out_endpoint = interface->desc.bInterfaceNumber;
/* find the endpoints that we need */
for (i = 0; i < interface->desc.bNumEndpoints; ++i) {
endpoint = &interface->endpoint[i].desc;
if ((endpoint->bEndpointAddress & 0x80) &&
((endpoint->bmAttributes & 3) == 0x02)) {
/* we found a bulk in endpoint */
dbg("found bulk in");
bulk_in_endpoint[num_bulk_in] = endpoint;
++num_bulk_in;
}
if (((endpoint->bEndpointAddress & 0x80) == 0x00) &&
((endpoint->bmAttributes & 3) == 0x02)) {
/* we found a bulk out endpoint */
dbg("found bulk out");
bulk_out_endpoint[num_bulk_out] = endpoint;
++num_bulk_out;
}
if ((endpoint->bEndpointAddress & 0x80) &&
((endpoint->bmAttributes & 3) == 0x03)) {
/* we found a interrupt in endpoint */
dbg("found interrupt in");
interrupt_in_endpoint[num_interrupt_in] = endpoint;
++num_interrupt_in;
}
}
/* according to the spec, we can only have 1 bulk_in, 1 bulk_out, and 1 interrupt_in endpoints */
if ((num_bulk_in != 1) ||
(num_bulk_out != 1) ||
(num_interrupt_in != 1)) {
dbg ("%s - improper number of endpoints. Bluetooth driver not bound.", __FUNCTION__);
return -EIO;
}
info("USB Bluetooth converter detected");
for (minor = 0; minor < BLUETOOTH_TTY_MINORS && bluetooth_table[minor]; ++minor)
;
if (bluetooth_table[minor]) {
err("No more free Bluetooth devices");
return -ENODEV;
}
if (!(bluetooth = kmalloc(sizeof(struct usb_bluetooth), GFP_KERNEL))) {
err("Out of memory");
return -ENOMEM;
}
memset(bluetooth, 0, sizeof(struct usb_bluetooth));
bluetooth->magic = USB_BLUETOOTH_MAGIC;
bluetooth->dev = dev;
bluetooth->minor = minor;
INIT_WORK(&bluetooth->work, bluetooth_softint, bluetooth);
init_MUTEX(&bluetooth->lock);
/* record the interface number for the control out */
bluetooth->control_out_bInterfaceNum = control_out_endpoint;
/* create our control out urb pool */
for (i = 0; i < NUM_CONTROL_URBS; ++i) {
struct urb *urb = usb_alloc_urb(0, GFP_KERNEL);
if (urb == NULL) {
err("No free urbs available");
goto probe_error;
}
urb->transfer_buffer = NULL;
bluetooth->control_urb_pool[i] = urb;
}
/* set up the endpoint information */
endpoint = bulk_in_endpoint[0];
bluetooth->read_urb = usb_alloc_urb (0, GFP_KERNEL);
if (!bluetooth->read_urb) {
err("No free urbs available");
goto probe_error;
}
bluetooth->bulk_in_buffer_size = buffer_size = le16_to_cpu(endpoint->wMaxPacketSize);
bluetooth->bulk_in_endpointAddress = endpoint->bEndpointAddress;
bluetooth->bulk_in_buffer = kmalloc (buffer_size, GFP_KERNEL);
if (!bluetooth->bulk_in_buffer) {
err("Couldn't allocate bulk_in_buffer");
goto probe_error;
}
usb_fill_bulk_urb(bluetooth->read_urb, dev, usb_rcvbulkpipe(dev, endpoint->bEndpointAddress),
bluetooth->bulk_in_buffer, buffer_size, bluetooth_read_bulk_callback, bluetooth);
endpoint = bulk_out_endpoint[0];
bluetooth->bulk_out_endpointAddress = endpoint->bEndpointAddress;
bluetooth->bulk_out_buffer_size = le16_to_cpu(endpoint->wMaxPacketSize) * 2;
endpoint = interrupt_in_endpoint[0];
bluetooth->interrupt_in_urb = usb_alloc_urb(0, GFP_KERNEL);
if (!bluetooth->interrupt_in_urb) {
err("No free urbs available");
goto probe_error;
}
bluetooth->interrupt_in_buffer_size = buffer_size = le16_to_cpu(endpoint->wMaxPacketSize);
bluetooth->interrupt_in_endpointAddress = endpoint->bEndpointAddress;
bluetooth->interrupt_in_interval = endpoint->bInterval;
bluetooth->interrupt_in_buffer = kmalloc (buffer_size, GFP_KERNEL);
if (!bluetooth->interrupt_in_buffer) {
err("Couldn't allocate interrupt_in_buffer");
goto probe_error;
}
usb_fill_int_urb(bluetooth->interrupt_in_urb, dev, usb_rcvintpipe(dev, endpoint->bEndpointAddress),
bluetooth->interrupt_in_buffer, buffer_size, bluetooth_int_callback,
bluetooth, endpoint->bInterval);
/* initialize the devfs nodes for this device and let the user know what bluetooths we are bound to */
tty_register_device (bluetooth_tty_driver, minor, &intf->dev);
info("Bluetooth converter now attached to ttyUB%d (or usb/ttub/%d for devfs)", minor, minor);
bluetooth_table[minor] = bluetooth;
/* success */
usb_set_intfdata (intf, bluetooth);
return 0;
probe_error:
if (bluetooth->read_urb)
usb_free_urb (bluetooth->read_urb);
if (bluetooth->bulk_in_buffer)
kfree (bluetooth->bulk_in_buffer);
if (bluetooth->interrupt_in_urb)
usb_free_urb (bluetooth->interrupt_in_urb);
if (bluetooth->interrupt_in_buffer)
kfree (bluetooth->interrupt_in_buffer);
for (i = 0; i < NUM_CONTROL_URBS; ++i)
if (bluetooth->control_urb_pool[i]) {
if (bluetooth->control_urb_pool[i]->transfer_buffer)
kfree (bluetooth->control_urb_pool[i]->transfer_buffer);
usb_free_urb (bluetooth->control_urb_pool[i]);
}
bluetooth_table[minor] = NULL;
/* free up any memory that we allocated */
kfree (bluetooth);
return -EIO;
}
static void usb_bluetooth_disconnect(struct usb_interface *intf)
{
struct usb_bluetooth *bluetooth = usb_get_intfdata (intf);
int i;
usb_set_intfdata (intf, NULL);
if (bluetooth) {
if ((bluetooth->open_count) && (bluetooth->tty))
tty_hangup(bluetooth->tty);
bluetooth->open_count = 0;
if (bluetooth->read_urb) {
usb_kill_urb (bluetooth->read_urb);
usb_free_urb (bluetooth->read_urb);
}
if (bluetooth->bulk_in_buffer)
kfree (bluetooth->bulk_in_buffer);
if (bluetooth->interrupt_in_urb) {
usb_kill_urb (bluetooth->interrupt_in_urb);
usb_free_urb (bluetooth->interrupt_in_urb);
}
if (bluetooth->interrupt_in_buffer)
kfree (bluetooth->interrupt_in_buffer);
tty_unregister_device (bluetooth_tty_driver, bluetooth->minor);
for (i = 0; i < NUM_CONTROL_URBS; ++i) {
if (bluetooth->control_urb_pool[i]) {
usb_kill_urb (bluetooth->control_urb_pool[i]);
if (bluetooth->control_urb_pool[i]->transfer_buffer)
kfree (bluetooth->control_urb_pool[i]->transfer_buffer);
usb_free_urb (bluetooth->control_urb_pool[i]);
}
}
info("Bluetooth converter now disconnected from ttyUB%d", bluetooth->minor);
bluetooth_table[bluetooth->minor] = NULL;
/* free up any memory that we allocated */
kfree (bluetooth);
} else {
info("device disconnected");
}
}
static struct tty_operations bluetooth_ops = {
.open = bluetooth_open,
.close = bluetooth_close,
.write = bluetooth_write,
.write_room = bluetooth_write_room,
.ioctl = bluetooth_ioctl,
.set_termios = bluetooth_set_termios,
.throttle = bluetooth_throttle,
.unthrottle = bluetooth_unthrottle,
.chars_in_buffer = bluetooth_chars_in_buffer,
};
static int usb_bluetooth_init(void)
{
int i;
int result;
/* Initialize our global data */
for (i = 0; i < BLUETOOTH_TTY_MINORS; ++i) {
bluetooth_table[i] = NULL;
}
info ("USB Bluetooth support registered");
bluetooth_tty_driver = alloc_tty_driver(BLUETOOTH_TTY_MINORS);
if (!bluetooth_tty_driver)
return -ENOMEM;
bluetooth_tty_driver->owner = THIS_MODULE;
bluetooth_tty_driver->driver_name = "usb-bluetooth";
bluetooth_tty_driver->name = "ttyUB";
bluetooth_tty_driver->devfs_name = "usb/ttub/";
bluetooth_tty_driver->major = BLUETOOTH_TTY_MAJOR;
bluetooth_tty_driver->minor_start = 0;
bluetooth_tty_driver->type = TTY_DRIVER_TYPE_SERIAL;
bluetooth_tty_driver->subtype = SERIAL_TYPE_NORMAL;
bluetooth_tty_driver->flags = TTY_DRIVER_REAL_RAW | TTY_DRIVER_NO_DEVFS;
bluetooth_tty_driver->init_termios = tty_std_termios;
bluetooth_tty_driver->init_termios.c_cflag = B9600 | CS8 | CREAD | HUPCL | CLOCAL;
tty_set_operations(bluetooth_tty_driver, &bluetooth_ops);
if (tty_register_driver (bluetooth_tty_driver)) {
err("%s - failed to register tty driver", __FUNCTION__);
put_tty_driver(bluetooth_tty_driver);
return -1;
}
/* register the USB driver */
result = usb_register(&usb_bluetooth_driver);
if (result < 0) {
tty_unregister_driver(bluetooth_tty_driver);
put_tty_driver(bluetooth_tty_driver);
err("usb_register failed for the USB bluetooth driver. Error number %d", result);
return -1;
}
info(DRIVER_DESC " " DRIVER_VERSION);
return 0;
}
static void usb_bluetooth_exit(void)
{
usb_deregister(&usb_bluetooth_driver);
tty_unregister_driver(bluetooth_tty_driver);
put_tty_driver(bluetooth_tty_driver);
}
module_init(usb_bluetooth_init);
module_exit(usb_bluetooth_exit);
/* Module information */
MODULE_AUTHOR( DRIVER_AUTHOR );
MODULE_DESCRIPTION( DRIVER_DESC );
MODULE_LICENSE("GPL");
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