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![Kees Cook](/assets/img/avatar_default.png)
In preparation for unconditionally passing the struct timer_list pointer to all timer callbacks, switch to using the new timer_setup() and from_timer() to pass the timer pointer explicitly. Additionally corrects and on-stack timer usage. Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org> Cc: Duncan Sands <duncan.sands@free.fr> Cc: "Gustavo A. R. Silva" <garsilva@embeddedor.com> Cc: accessrunner-general@lists.sourceforge.net Cc: linux-usb@vger.kernel.org Signed-off-by: Kees Cook <keescook@chromium.org> Reviewed-by: Allen Pais <allen.lkml@gmail.com>
1324 lines
35 KiB
C
1324 lines
35 KiB
C
// SPDX-License-Identifier: GPL-2.0+
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/******************************************************************************
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* usbatm.c - Generic USB xDSL driver core
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*
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* Copyright (C) 2001, Alcatel
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* Copyright (C) 2003, Duncan Sands, SolNegro, Josep Comas
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* Copyright (C) 2004, David Woodhouse, Roman Kagan
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******************************************************************************/
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/*
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* Written by Johan Verrept, Duncan Sands (duncan.sands@free.fr) and David Woodhouse
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*
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* 1.7+: - See the check-in logs
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*
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* 1.6: - No longer opens a connection if the firmware is not loaded
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* - Added support for the speedtouch 330
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* - Removed the limit on the number of devices
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* - Module now autoloads on device plugin
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* - Merged relevant parts of sarlib
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* - Replaced the kernel thread with a tasklet
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* - New packet transmission code
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* - Changed proc file contents
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* - Fixed all known SMP races
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* - Many fixes and cleanups
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* - Various fixes by Oliver Neukum (oliver@neukum.name)
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*
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* 1.5A: - Version for inclusion in 2.5 series kernel
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* - Modifications by Richard Purdie (rpurdie@rpsys.net)
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* - made compatible with kernel 2.5.6 onwards by changing
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* usbatm_usb_send_data_context->urb to a pointer and adding code
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* to alloc and free it
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* - remove_wait_queue() added to usbatm_atm_processqueue_thread()
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*
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* 1.5: - fixed memory leak when atmsar_decode_aal5 returned NULL.
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* (reported by stephen.robinson@zen.co.uk)
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*
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* 1.4: - changed the spin_lock() under interrupt to spin_lock_irqsave()
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* - unlink all active send urbs of a vcc that is being closed.
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*
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* 1.3.1: - added the version number
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*
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* 1.3: - Added multiple send urb support
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* - fixed memory leak and vcc->tx_inuse starvation bug
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* when not enough memory left in vcc.
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*
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* 1.2: - Fixed race condition in usbatm_usb_send_data()
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* 1.1: - Turned off packet debugging
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*
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*/
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#include "usbatm.h"
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#include <linux/uaccess.h>
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#include <linux/crc32.h>
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#include <linux/errno.h>
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#include <linux/init.h>
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#include <linux/interrupt.h>
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/moduleparam.h>
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#include <linux/netdevice.h>
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#include <linux/proc_fs.h>
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#include <linux/sched/signal.h>
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#include <linux/signal.h>
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#include <linux/slab.h>
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#include <linux/stat.h>
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#include <linux/timer.h>
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#include <linux/wait.h>
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#include <linux/kthread.h>
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#include <linux/ratelimit.h>
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#ifdef VERBOSE_DEBUG
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static int usbatm_print_packet(struct usbatm_data *instance, const unsigned char *data, int len);
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#define PACKETDEBUG(arg...) usbatm_print_packet(arg)
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#define vdbg(arg...) dev_dbg(arg)
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#else
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#define PACKETDEBUG(arg...)
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#define vdbg(arg...)
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#endif
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#define DRIVER_AUTHOR "Johan Verrept, Duncan Sands <duncan.sands@free.fr>"
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#define DRIVER_DESC "Generic USB ATM/DSL I/O"
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static const char usbatm_driver_name[] = "usbatm";
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#define UDSL_MAX_RCV_URBS 16
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#define UDSL_MAX_SND_URBS 16
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#define UDSL_MAX_BUF_SIZE 65536
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#define UDSL_DEFAULT_RCV_URBS 4
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#define UDSL_DEFAULT_SND_URBS 4
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#define UDSL_DEFAULT_RCV_BUF_SIZE 3392 /* 64 * ATM_CELL_SIZE */
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#define UDSL_DEFAULT_SND_BUF_SIZE 3392 /* 64 * ATM_CELL_SIZE */
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#define ATM_CELL_HEADER (ATM_CELL_SIZE - ATM_CELL_PAYLOAD)
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#define THROTTLE_MSECS 100 /* delay to recover processing after urb submission fails */
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static unsigned int num_rcv_urbs = UDSL_DEFAULT_RCV_URBS;
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static unsigned int num_snd_urbs = UDSL_DEFAULT_SND_URBS;
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static unsigned int rcv_buf_bytes = UDSL_DEFAULT_RCV_BUF_SIZE;
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static unsigned int snd_buf_bytes = UDSL_DEFAULT_SND_BUF_SIZE;
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module_param(num_rcv_urbs, uint, S_IRUGO);
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MODULE_PARM_DESC(num_rcv_urbs,
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"Number of urbs used for reception (range: 0-"
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__MODULE_STRING(UDSL_MAX_RCV_URBS) ", default: "
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__MODULE_STRING(UDSL_DEFAULT_RCV_URBS) ")");
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module_param(num_snd_urbs, uint, S_IRUGO);
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MODULE_PARM_DESC(num_snd_urbs,
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"Number of urbs used for transmission (range: 0-"
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__MODULE_STRING(UDSL_MAX_SND_URBS) ", default: "
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__MODULE_STRING(UDSL_DEFAULT_SND_URBS) ")");
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module_param(rcv_buf_bytes, uint, S_IRUGO);
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MODULE_PARM_DESC(rcv_buf_bytes,
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"Size of the buffers used for reception, in bytes (range: 1-"
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__MODULE_STRING(UDSL_MAX_BUF_SIZE) ", default: "
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__MODULE_STRING(UDSL_DEFAULT_RCV_BUF_SIZE) ")");
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module_param(snd_buf_bytes, uint, S_IRUGO);
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MODULE_PARM_DESC(snd_buf_bytes,
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"Size of the buffers used for transmission, in bytes (range: 1-"
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__MODULE_STRING(UDSL_MAX_BUF_SIZE) ", default: "
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__MODULE_STRING(UDSL_DEFAULT_SND_BUF_SIZE) ")");
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/* receive */
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struct usbatm_vcc_data {
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/* vpi/vci lookup */
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struct list_head list;
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short vpi;
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int vci;
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struct atm_vcc *vcc;
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/* raw cell reassembly */
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struct sk_buff *sarb;
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};
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/* send */
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struct usbatm_control {
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struct atm_skb_data atm;
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u32 len;
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u32 crc;
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};
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#define UDSL_SKB(x) ((struct usbatm_control *)(x)->cb)
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/* ATM */
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static void usbatm_atm_dev_close(struct atm_dev *atm_dev);
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static int usbatm_atm_open(struct atm_vcc *vcc);
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static void usbatm_atm_close(struct atm_vcc *vcc);
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static int usbatm_atm_ioctl(struct atm_dev *atm_dev, unsigned int cmd, void __user *arg);
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static int usbatm_atm_send(struct atm_vcc *vcc, struct sk_buff *skb);
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static int usbatm_atm_proc_read(struct atm_dev *atm_dev, loff_t *pos, char *page);
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static const struct atmdev_ops usbatm_atm_devops = {
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.dev_close = usbatm_atm_dev_close,
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.open = usbatm_atm_open,
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.close = usbatm_atm_close,
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.ioctl = usbatm_atm_ioctl,
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.send = usbatm_atm_send,
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.proc_read = usbatm_atm_proc_read,
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.owner = THIS_MODULE,
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};
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/***********
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** misc **
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***********/
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static inline unsigned int usbatm_pdu_length(unsigned int length)
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{
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length += ATM_CELL_PAYLOAD - 1 + ATM_AAL5_TRAILER;
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return length - length % ATM_CELL_PAYLOAD;
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}
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static inline void usbatm_pop(struct atm_vcc *vcc, struct sk_buff *skb)
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{
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if (vcc->pop)
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vcc->pop(vcc, skb);
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else
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dev_kfree_skb_any(skb);
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}
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/***********
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** urbs **
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************/
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static struct urb *usbatm_pop_urb(struct usbatm_channel *channel)
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{
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struct urb *urb;
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spin_lock_irq(&channel->lock);
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if (list_empty(&channel->list)) {
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spin_unlock_irq(&channel->lock);
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return NULL;
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}
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urb = list_entry(channel->list.next, struct urb, urb_list);
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list_del(&urb->urb_list);
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spin_unlock_irq(&channel->lock);
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return urb;
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}
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static int usbatm_submit_urb(struct urb *urb)
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{
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struct usbatm_channel *channel = urb->context;
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int ret;
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/* vdbg("%s: submitting urb 0x%p, size %u",
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__func__, urb, urb->transfer_buffer_length); */
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ret = usb_submit_urb(urb, GFP_ATOMIC);
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if (ret) {
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if (printk_ratelimit())
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atm_warn(channel->usbatm, "%s: urb 0x%p submission failed (%d)!\n",
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__func__, urb, ret);
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/* consider all errors transient and return the buffer back to the queue */
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urb->status = -EAGAIN;
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spin_lock_irq(&channel->lock);
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/* must add to the front when sending; doesn't matter when receiving */
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list_add(&urb->urb_list, &channel->list);
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spin_unlock_irq(&channel->lock);
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/* make sure the channel doesn't stall */
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mod_timer(&channel->delay, jiffies + msecs_to_jiffies(THROTTLE_MSECS));
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}
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return ret;
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}
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static void usbatm_complete(struct urb *urb)
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{
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struct usbatm_channel *channel = urb->context;
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unsigned long flags;
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int status = urb->status;
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/* vdbg("%s: urb 0x%p, status %d, actual_length %d",
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__func__, urb, status, urb->actual_length); */
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/* usually in_interrupt(), but not always */
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spin_lock_irqsave(&channel->lock, flags);
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/* must add to the back when receiving; doesn't matter when sending */
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list_add_tail(&urb->urb_list, &channel->list);
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spin_unlock_irqrestore(&channel->lock, flags);
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if (unlikely(status) &&
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(!(channel->usbatm->flags & UDSL_IGNORE_EILSEQ) ||
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status != -EILSEQ)) {
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if (status == -ESHUTDOWN)
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return;
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if (printk_ratelimit())
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atm_warn(channel->usbatm, "%s: urb 0x%p failed (%d)!\n",
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__func__, urb, status);
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/* throttle processing in case of an error */
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mod_timer(&channel->delay, jiffies + msecs_to_jiffies(THROTTLE_MSECS));
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} else
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tasklet_schedule(&channel->tasklet);
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}
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/*************
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** decode **
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*************/
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static inline struct usbatm_vcc_data *usbatm_find_vcc(struct usbatm_data *instance,
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short vpi, int vci)
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{
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struct usbatm_vcc_data *vcc_data;
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list_for_each_entry(vcc_data, &instance->vcc_list, list)
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if ((vcc_data->vci == vci) && (vcc_data->vpi == vpi))
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return vcc_data;
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return NULL;
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}
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static void usbatm_extract_one_cell(struct usbatm_data *instance, unsigned char *source)
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{
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struct atm_vcc *vcc;
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struct sk_buff *sarb;
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short vpi = ((source[0] & 0x0f) << 4) | (source[1] >> 4);
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int vci = ((source[1] & 0x0f) << 12) | (source[2] << 4) | (source[3] >> 4);
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u8 pti = ((source[3] & 0xe) >> 1);
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if ((vci != instance->cached_vci) || (vpi != instance->cached_vpi)) {
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instance->cached_vpi = vpi;
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instance->cached_vci = vci;
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instance->cached_vcc = usbatm_find_vcc(instance, vpi, vci);
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if (!instance->cached_vcc)
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atm_rldbg(instance, "%s: unknown vpi/vci (%hd/%d)!\n", __func__, vpi, vci);
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}
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if (!instance->cached_vcc)
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return;
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vcc = instance->cached_vcc->vcc;
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/* OAM F5 end-to-end */
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if (pti == ATM_PTI_E2EF5) {
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if (printk_ratelimit())
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atm_warn(instance, "%s: OAM not supported (vpi %d, vci %d)!\n",
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__func__, vpi, vci);
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atomic_inc(&vcc->stats->rx_err);
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return;
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}
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sarb = instance->cached_vcc->sarb;
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if (sarb->tail + ATM_CELL_PAYLOAD > sarb->end) {
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atm_rldbg(instance, "%s: buffer overrun (sarb->len %u, vcc: 0x%p)!\n",
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__func__, sarb->len, vcc);
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/* discard cells already received */
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skb_trim(sarb, 0);
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}
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memcpy(skb_tail_pointer(sarb), source + ATM_CELL_HEADER, ATM_CELL_PAYLOAD);
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__skb_put(sarb, ATM_CELL_PAYLOAD);
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if (pti & 1) {
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struct sk_buff *skb;
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unsigned int length;
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unsigned int pdu_length;
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length = (source[ATM_CELL_SIZE - 6] << 8) + source[ATM_CELL_SIZE - 5];
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/* guard against overflow */
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if (length > ATM_MAX_AAL5_PDU) {
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atm_rldbg(instance, "%s: bogus length %u (vcc: 0x%p)!\n",
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__func__, length, vcc);
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atomic_inc(&vcc->stats->rx_err);
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goto out;
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}
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pdu_length = usbatm_pdu_length(length);
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if (sarb->len < pdu_length) {
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atm_rldbg(instance, "%s: bogus pdu_length %u (sarb->len: %u, vcc: 0x%p)!\n",
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__func__, pdu_length, sarb->len, vcc);
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atomic_inc(&vcc->stats->rx_err);
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goto out;
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}
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if (crc32_be(~0, skb_tail_pointer(sarb) - pdu_length, pdu_length) != 0xc704dd7b) {
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atm_rldbg(instance, "%s: packet failed crc check (vcc: 0x%p)!\n",
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__func__, vcc);
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atomic_inc(&vcc->stats->rx_err);
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goto out;
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}
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vdbg(&instance->usb_intf->dev,
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"%s: got packet (length: %u, pdu_length: %u, vcc: 0x%p)",
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__func__, length, pdu_length, vcc);
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skb = dev_alloc_skb(length);
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if (!skb) {
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if (printk_ratelimit())
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atm_err(instance, "%s: no memory for skb (length: %u)!\n",
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__func__, length);
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atomic_inc(&vcc->stats->rx_drop);
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goto out;
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}
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vdbg(&instance->usb_intf->dev,
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"%s: allocated new sk_buff (skb: 0x%p, skb->truesize: %u)",
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__func__, skb, skb->truesize);
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if (!atm_charge(vcc, skb->truesize)) {
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atm_rldbg(instance, "%s: failed atm_charge (skb->truesize: %u)!\n",
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__func__, skb->truesize);
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dev_kfree_skb_any(skb);
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goto out; /* atm_charge increments rx_drop */
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}
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skb_copy_to_linear_data(skb,
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skb_tail_pointer(sarb) - pdu_length,
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length);
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__skb_put(skb, length);
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vdbg(&instance->usb_intf->dev,
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"%s: sending skb 0x%p, skb->len %u, skb->truesize %u",
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__func__, skb, skb->len, skb->truesize);
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PACKETDEBUG(instance, skb->data, skb->len);
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vcc->push(vcc, skb);
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atomic_inc(&vcc->stats->rx);
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out:
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skb_trim(sarb, 0);
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}
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}
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static void usbatm_extract_cells(struct usbatm_data *instance,
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unsigned char *source, unsigned int avail_data)
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{
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unsigned int stride = instance->rx_channel.stride;
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unsigned int buf_usage = instance->buf_usage;
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/* extract cells from incoming data, taking into account that
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* the length of avail data may not be a multiple of stride */
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if (buf_usage > 0) {
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/* we have a partially received atm cell */
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unsigned char *cell_buf = instance->cell_buf;
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unsigned int space_left = stride - buf_usage;
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if (avail_data >= space_left) {
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/* add new data and process cell */
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memcpy(cell_buf + buf_usage, source, space_left);
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source += space_left;
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avail_data -= space_left;
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usbatm_extract_one_cell(instance, cell_buf);
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instance->buf_usage = 0;
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} else {
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/* not enough data to fill the cell */
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memcpy(cell_buf + buf_usage, source, avail_data);
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instance->buf_usage = buf_usage + avail_data;
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return;
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}
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}
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for (; avail_data >= stride; avail_data -= stride, source += stride)
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usbatm_extract_one_cell(instance, source);
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if (avail_data > 0) {
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/* length was not a multiple of stride -
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* save remaining data for next call */
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memcpy(instance->cell_buf, source, avail_data);
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instance->buf_usage = avail_data;
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}
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}
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/*************
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** encode **
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*************/
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static unsigned int usbatm_write_cells(struct usbatm_data *instance,
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struct sk_buff *skb,
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u8 *target, unsigned int avail_space)
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{
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struct usbatm_control *ctrl = UDSL_SKB(skb);
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struct atm_vcc *vcc = ctrl->atm.vcc;
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unsigned int bytes_written;
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unsigned int stride = instance->tx_channel.stride;
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|
|
for (bytes_written = 0; bytes_written < avail_space && ctrl->len;
|
|
bytes_written += stride, target += stride) {
|
|
unsigned int data_len = min_t(unsigned int, skb->len, ATM_CELL_PAYLOAD);
|
|
unsigned int left = ATM_CELL_PAYLOAD - data_len;
|
|
u8 *ptr = target;
|
|
|
|
ptr[0] = vcc->vpi >> 4;
|
|
ptr[1] = (vcc->vpi << 4) | (vcc->vci >> 12);
|
|
ptr[2] = vcc->vci >> 4;
|
|
ptr[3] = vcc->vci << 4;
|
|
ptr[4] = 0xec;
|
|
ptr += ATM_CELL_HEADER;
|
|
|
|
skb_copy_from_linear_data(skb, ptr, data_len);
|
|
ptr += data_len;
|
|
__skb_pull(skb, data_len);
|
|
|
|
if (!left)
|
|
continue;
|
|
|
|
memset(ptr, 0, left);
|
|
|
|
if (left >= ATM_AAL5_TRAILER) { /* trailer will go in this cell */
|
|
u8 *trailer = target + ATM_CELL_SIZE - ATM_AAL5_TRAILER;
|
|
/* trailer[0] = 0; UU = 0 */
|
|
/* trailer[1] = 0; CPI = 0 */
|
|
trailer[2] = ctrl->len >> 8;
|
|
trailer[3] = ctrl->len;
|
|
|
|
ctrl->crc = ~crc32_be(ctrl->crc, ptr, left - 4);
|
|
|
|
trailer[4] = ctrl->crc >> 24;
|
|
trailer[5] = ctrl->crc >> 16;
|
|
trailer[6] = ctrl->crc >> 8;
|
|
trailer[7] = ctrl->crc;
|
|
|
|
target[3] |= 0x2; /* adjust PTI */
|
|
|
|
ctrl->len = 0; /* tag this skb finished */
|
|
} else
|
|
ctrl->crc = crc32_be(ctrl->crc, ptr, left);
|
|
}
|
|
|
|
return bytes_written;
|
|
}
|
|
|
|
|
|
/**************
|
|
** receive **
|
|
**************/
|
|
|
|
static void usbatm_rx_process(unsigned long data)
|
|
{
|
|
struct usbatm_data *instance = (struct usbatm_data *)data;
|
|
struct urb *urb;
|
|
|
|
while ((urb = usbatm_pop_urb(&instance->rx_channel))) {
|
|
vdbg(&instance->usb_intf->dev,
|
|
"%s: processing urb 0x%p", __func__, urb);
|
|
|
|
if (usb_pipeisoc(urb->pipe)) {
|
|
unsigned char *merge_start = NULL;
|
|
unsigned int merge_length = 0;
|
|
const unsigned int packet_size = instance->rx_channel.packet_size;
|
|
int i;
|
|
|
|
for (i = 0; i < urb->number_of_packets; i++) {
|
|
if (!urb->iso_frame_desc[i].status) {
|
|
unsigned int actual_length = urb->iso_frame_desc[i].actual_length;
|
|
|
|
if (!merge_length)
|
|
merge_start = (unsigned char *)urb->transfer_buffer + urb->iso_frame_desc[i].offset;
|
|
merge_length += actual_length;
|
|
if (merge_length && (actual_length < packet_size)) {
|
|
usbatm_extract_cells(instance, merge_start, merge_length);
|
|
merge_length = 0;
|
|
}
|
|
} else {
|
|
atm_rldbg(instance, "%s: status %d in frame %d!\n", __func__, urb->status, i);
|
|
if (merge_length)
|
|
usbatm_extract_cells(instance, merge_start, merge_length);
|
|
merge_length = 0;
|
|
instance->buf_usage = 0;
|
|
}
|
|
}
|
|
|
|
if (merge_length)
|
|
usbatm_extract_cells(instance, merge_start, merge_length);
|
|
} else
|
|
if (!urb->status)
|
|
usbatm_extract_cells(instance, urb->transfer_buffer, urb->actual_length);
|
|
else
|
|
instance->buf_usage = 0;
|
|
|
|
if (usbatm_submit_urb(urb))
|
|
return;
|
|
}
|
|
}
|
|
|
|
|
|
/***********
|
|
** send **
|
|
***********/
|
|
|
|
static void usbatm_tx_process(unsigned long data)
|
|
{
|
|
struct usbatm_data *instance = (struct usbatm_data *)data;
|
|
struct sk_buff *skb = instance->current_skb;
|
|
struct urb *urb = NULL;
|
|
const unsigned int buf_size = instance->tx_channel.buf_size;
|
|
unsigned int bytes_written = 0;
|
|
u8 *buffer = NULL;
|
|
|
|
if (!skb)
|
|
skb = skb_dequeue(&instance->sndqueue);
|
|
|
|
while (skb) {
|
|
if (!urb) {
|
|
urb = usbatm_pop_urb(&instance->tx_channel);
|
|
if (!urb)
|
|
break; /* no more senders */
|
|
buffer = urb->transfer_buffer;
|
|
bytes_written = (urb->status == -EAGAIN) ?
|
|
urb->transfer_buffer_length : 0;
|
|
}
|
|
|
|
bytes_written += usbatm_write_cells(instance, skb,
|
|
buffer + bytes_written,
|
|
buf_size - bytes_written);
|
|
|
|
vdbg(&instance->usb_intf->dev,
|
|
"%s: wrote %u bytes from skb 0x%p to urb 0x%p",
|
|
__func__, bytes_written, skb, urb);
|
|
|
|
if (!UDSL_SKB(skb)->len) {
|
|
struct atm_vcc *vcc = UDSL_SKB(skb)->atm.vcc;
|
|
|
|
usbatm_pop(vcc, skb);
|
|
atomic_inc(&vcc->stats->tx);
|
|
|
|
skb = skb_dequeue(&instance->sndqueue);
|
|
}
|
|
|
|
if (bytes_written == buf_size || (!skb && bytes_written)) {
|
|
urb->transfer_buffer_length = bytes_written;
|
|
|
|
if (usbatm_submit_urb(urb))
|
|
break;
|
|
urb = NULL;
|
|
}
|
|
}
|
|
|
|
instance->current_skb = skb;
|
|
}
|
|
|
|
static void usbatm_cancel_send(struct usbatm_data *instance,
|
|
struct atm_vcc *vcc)
|
|
{
|
|
struct sk_buff *skb, *n;
|
|
|
|
spin_lock_irq(&instance->sndqueue.lock);
|
|
skb_queue_walk_safe(&instance->sndqueue, skb, n) {
|
|
if (UDSL_SKB(skb)->atm.vcc == vcc) {
|
|
atm_dbg(instance, "%s: popping skb 0x%p\n", __func__, skb);
|
|
__skb_unlink(skb, &instance->sndqueue);
|
|
usbatm_pop(vcc, skb);
|
|
}
|
|
}
|
|
spin_unlock_irq(&instance->sndqueue.lock);
|
|
|
|
tasklet_disable(&instance->tx_channel.tasklet);
|
|
if ((skb = instance->current_skb) && (UDSL_SKB(skb)->atm.vcc == vcc)) {
|
|
atm_dbg(instance, "%s: popping current skb (0x%p)\n", __func__, skb);
|
|
instance->current_skb = NULL;
|
|
usbatm_pop(vcc, skb);
|
|
}
|
|
tasklet_enable(&instance->tx_channel.tasklet);
|
|
}
|
|
|
|
static int usbatm_atm_send(struct atm_vcc *vcc, struct sk_buff *skb)
|
|
{
|
|
struct usbatm_data *instance = vcc->dev->dev_data;
|
|
struct usbatm_control *ctrl = UDSL_SKB(skb);
|
|
int err;
|
|
|
|
/* racy disconnection check - fine */
|
|
if (!instance || instance->disconnected) {
|
|
#ifdef VERBOSE_DEBUG
|
|
printk_ratelimited(KERN_DEBUG "%s: %s!\n", __func__, instance ? "disconnected" : "NULL instance");
|
|
#endif
|
|
err = -ENODEV;
|
|
goto fail;
|
|
}
|
|
|
|
if (vcc->qos.aal != ATM_AAL5) {
|
|
atm_rldbg(instance, "%s: unsupported ATM type %d!\n", __func__, vcc->qos.aal);
|
|
err = -EINVAL;
|
|
goto fail;
|
|
}
|
|
|
|
if (skb->len > ATM_MAX_AAL5_PDU) {
|
|
atm_rldbg(instance, "%s: packet too long (%d vs %d)!\n",
|
|
__func__, skb->len, ATM_MAX_AAL5_PDU);
|
|
err = -EINVAL;
|
|
goto fail;
|
|
}
|
|
|
|
PACKETDEBUG(instance, skb->data, skb->len);
|
|
|
|
/* initialize the control block */
|
|
ctrl->atm.vcc = vcc;
|
|
ctrl->len = skb->len;
|
|
ctrl->crc = crc32_be(~0, skb->data, skb->len);
|
|
|
|
skb_queue_tail(&instance->sndqueue, skb);
|
|
tasklet_schedule(&instance->tx_channel.tasklet);
|
|
|
|
return 0;
|
|
|
|
fail:
|
|
usbatm_pop(vcc, skb);
|
|
return err;
|
|
}
|
|
|
|
|
|
/********************
|
|
** bean counting **
|
|
********************/
|
|
|
|
static void usbatm_destroy_instance(struct kref *kref)
|
|
{
|
|
struct usbatm_data *instance = container_of(kref, struct usbatm_data, refcount);
|
|
|
|
tasklet_kill(&instance->rx_channel.tasklet);
|
|
tasklet_kill(&instance->tx_channel.tasklet);
|
|
usb_put_dev(instance->usb_dev);
|
|
kfree(instance);
|
|
}
|
|
|
|
static void usbatm_get_instance(struct usbatm_data *instance)
|
|
{
|
|
kref_get(&instance->refcount);
|
|
}
|
|
|
|
static void usbatm_put_instance(struct usbatm_data *instance)
|
|
{
|
|
kref_put(&instance->refcount, usbatm_destroy_instance);
|
|
}
|
|
|
|
|
|
/**********
|
|
** ATM **
|
|
**********/
|
|
|
|
static void usbatm_atm_dev_close(struct atm_dev *atm_dev)
|
|
{
|
|
struct usbatm_data *instance = atm_dev->dev_data;
|
|
|
|
if (!instance)
|
|
return;
|
|
|
|
atm_dev->dev_data = NULL; /* catch bugs */
|
|
usbatm_put_instance(instance); /* taken in usbatm_atm_init */
|
|
}
|
|
|
|
static int usbatm_atm_proc_read(struct atm_dev *atm_dev, loff_t *pos, char *page)
|
|
{
|
|
struct usbatm_data *instance = atm_dev->dev_data;
|
|
int left = *pos;
|
|
|
|
if (!instance)
|
|
return -ENODEV;
|
|
|
|
if (!left--)
|
|
return sprintf(page, "%s\n", instance->description);
|
|
|
|
if (!left--)
|
|
return sprintf(page, "MAC: %pM\n", atm_dev->esi);
|
|
|
|
if (!left--)
|
|
return sprintf(page,
|
|
"AAL5: tx %d ( %d err ), rx %d ( %d err, %d drop )\n",
|
|
atomic_read(&atm_dev->stats.aal5.tx),
|
|
atomic_read(&atm_dev->stats.aal5.tx_err),
|
|
atomic_read(&atm_dev->stats.aal5.rx),
|
|
atomic_read(&atm_dev->stats.aal5.rx_err),
|
|
atomic_read(&atm_dev->stats.aal5.rx_drop));
|
|
|
|
if (!left--) {
|
|
if (instance->disconnected)
|
|
return sprintf(page, "Disconnected\n");
|
|
else
|
|
switch (atm_dev->signal) {
|
|
case ATM_PHY_SIG_FOUND:
|
|
return sprintf(page, "Line up\n");
|
|
case ATM_PHY_SIG_LOST:
|
|
return sprintf(page, "Line down\n");
|
|
default:
|
|
return sprintf(page, "Line state unknown\n");
|
|
}
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int usbatm_atm_open(struct atm_vcc *vcc)
|
|
{
|
|
struct usbatm_data *instance = vcc->dev->dev_data;
|
|
struct usbatm_vcc_data *new = NULL;
|
|
int ret;
|
|
int vci = vcc->vci;
|
|
short vpi = vcc->vpi;
|
|
|
|
if (!instance)
|
|
return -ENODEV;
|
|
|
|
/* only support AAL5 */
|
|
if ((vcc->qos.aal != ATM_AAL5)) {
|
|
atm_warn(instance, "%s: unsupported ATM type %d!\n", __func__, vcc->qos.aal);
|
|
return -EINVAL;
|
|
}
|
|
|
|
/* sanity checks */
|
|
if ((vcc->qos.rxtp.max_sdu < 0) || (vcc->qos.rxtp.max_sdu > ATM_MAX_AAL5_PDU)) {
|
|
atm_dbg(instance, "%s: max_sdu %d out of range!\n", __func__, vcc->qos.rxtp.max_sdu);
|
|
return -EINVAL;
|
|
}
|
|
|
|
mutex_lock(&instance->serialize); /* vs self, usbatm_atm_close, usbatm_usb_disconnect */
|
|
|
|
if (instance->disconnected) {
|
|
atm_dbg(instance, "%s: disconnected!\n", __func__);
|
|
ret = -ENODEV;
|
|
goto fail;
|
|
}
|
|
|
|
if (usbatm_find_vcc(instance, vpi, vci)) {
|
|
atm_dbg(instance, "%s: %hd/%d already in use!\n", __func__, vpi, vci);
|
|
ret = -EADDRINUSE;
|
|
goto fail;
|
|
}
|
|
|
|
new = kzalloc(sizeof(struct usbatm_vcc_data), GFP_KERNEL);
|
|
if (!new) {
|
|
ret = -ENOMEM;
|
|
goto fail;
|
|
}
|
|
|
|
new->vcc = vcc;
|
|
new->vpi = vpi;
|
|
new->vci = vci;
|
|
|
|
new->sarb = alloc_skb(usbatm_pdu_length(vcc->qos.rxtp.max_sdu), GFP_KERNEL);
|
|
if (!new->sarb) {
|
|
atm_err(instance, "%s: no memory for SAR buffer!\n", __func__);
|
|
ret = -ENOMEM;
|
|
goto fail;
|
|
}
|
|
|
|
vcc->dev_data = new;
|
|
|
|
tasklet_disable(&instance->rx_channel.tasklet);
|
|
instance->cached_vcc = new;
|
|
instance->cached_vpi = vpi;
|
|
instance->cached_vci = vci;
|
|
list_add(&new->list, &instance->vcc_list);
|
|
tasklet_enable(&instance->rx_channel.tasklet);
|
|
|
|
set_bit(ATM_VF_ADDR, &vcc->flags);
|
|
set_bit(ATM_VF_PARTIAL, &vcc->flags);
|
|
set_bit(ATM_VF_READY, &vcc->flags);
|
|
|
|
mutex_unlock(&instance->serialize);
|
|
|
|
atm_dbg(instance, "%s: allocated vcc data 0x%p\n", __func__, new);
|
|
|
|
return 0;
|
|
|
|
fail:
|
|
kfree(new);
|
|
mutex_unlock(&instance->serialize);
|
|
return ret;
|
|
}
|
|
|
|
static void usbatm_atm_close(struct atm_vcc *vcc)
|
|
{
|
|
struct usbatm_data *instance = vcc->dev->dev_data;
|
|
struct usbatm_vcc_data *vcc_data = vcc->dev_data;
|
|
|
|
if (!instance || !vcc_data)
|
|
return;
|
|
|
|
usbatm_cancel_send(instance, vcc);
|
|
|
|
mutex_lock(&instance->serialize); /* vs self, usbatm_atm_open, usbatm_usb_disconnect */
|
|
|
|
tasklet_disable(&instance->rx_channel.tasklet);
|
|
if (instance->cached_vcc == vcc_data) {
|
|
instance->cached_vcc = NULL;
|
|
instance->cached_vpi = ATM_VPI_UNSPEC;
|
|
instance->cached_vci = ATM_VCI_UNSPEC;
|
|
}
|
|
list_del(&vcc_data->list);
|
|
tasklet_enable(&instance->rx_channel.tasklet);
|
|
|
|
kfree_skb(vcc_data->sarb);
|
|
vcc_data->sarb = NULL;
|
|
|
|
kfree(vcc_data);
|
|
vcc->dev_data = NULL;
|
|
|
|
vcc->vpi = ATM_VPI_UNSPEC;
|
|
vcc->vci = ATM_VCI_UNSPEC;
|
|
clear_bit(ATM_VF_READY, &vcc->flags);
|
|
clear_bit(ATM_VF_PARTIAL, &vcc->flags);
|
|
clear_bit(ATM_VF_ADDR, &vcc->flags);
|
|
|
|
mutex_unlock(&instance->serialize);
|
|
}
|
|
|
|
static int usbatm_atm_ioctl(struct atm_dev *atm_dev, unsigned int cmd,
|
|
void __user *arg)
|
|
{
|
|
struct usbatm_data *instance = atm_dev->dev_data;
|
|
|
|
if (!instance || instance->disconnected)
|
|
return -ENODEV;
|
|
|
|
switch (cmd) {
|
|
case ATM_QUERYLOOP:
|
|
return put_user(ATM_LM_NONE, (int __user *)arg) ? -EFAULT : 0;
|
|
default:
|
|
return -ENOIOCTLCMD;
|
|
}
|
|
}
|
|
|
|
static int usbatm_atm_init(struct usbatm_data *instance)
|
|
{
|
|
struct atm_dev *atm_dev;
|
|
int ret, i;
|
|
|
|
/* ATM init. The ATM initialization scheme suffers from an intrinsic race
|
|
* condition: callbacks we register can be executed at once, before we have
|
|
* initialized the struct atm_dev. To protect against this, all callbacks
|
|
* abort if atm_dev->dev_data is NULL. */
|
|
atm_dev = atm_dev_register(instance->driver_name,
|
|
&instance->usb_intf->dev, &usbatm_atm_devops,
|
|
-1, NULL);
|
|
if (!atm_dev) {
|
|
usb_err(instance, "%s: failed to register ATM device!\n", __func__);
|
|
return -1;
|
|
}
|
|
|
|
instance->atm_dev = atm_dev;
|
|
|
|
atm_dev->ci_range.vpi_bits = ATM_CI_MAX;
|
|
atm_dev->ci_range.vci_bits = ATM_CI_MAX;
|
|
atm_dev->signal = ATM_PHY_SIG_UNKNOWN;
|
|
|
|
/* temp init ATM device, set to 128kbit */
|
|
atm_dev->link_rate = 128 * 1000 / 424;
|
|
|
|
if (instance->driver->atm_start && ((ret = instance->driver->atm_start(instance, atm_dev)) < 0)) {
|
|
atm_err(instance, "%s: atm_start failed: %d!\n", __func__, ret);
|
|
goto fail;
|
|
}
|
|
|
|
usbatm_get_instance(instance); /* dropped in usbatm_atm_dev_close */
|
|
|
|
/* ready for ATM callbacks */
|
|
mb();
|
|
atm_dev->dev_data = instance;
|
|
|
|
/* submit all rx URBs */
|
|
for (i = 0; i < num_rcv_urbs; i++)
|
|
usbatm_submit_urb(instance->urbs[i]);
|
|
|
|
return 0;
|
|
|
|
fail:
|
|
instance->atm_dev = NULL;
|
|
atm_dev_deregister(atm_dev); /* usbatm_atm_dev_close will eventually be called */
|
|
return ret;
|
|
}
|
|
|
|
|
|
/**********
|
|
** USB **
|
|
**********/
|
|
|
|
static int usbatm_do_heavy_init(void *arg)
|
|
{
|
|
struct usbatm_data *instance = arg;
|
|
int ret;
|
|
|
|
allow_signal(SIGTERM);
|
|
complete(&instance->thread_started);
|
|
|
|
ret = instance->driver->heavy_init(instance, instance->usb_intf);
|
|
|
|
if (!ret)
|
|
ret = usbatm_atm_init(instance);
|
|
|
|
mutex_lock(&instance->serialize);
|
|
instance->thread = NULL;
|
|
mutex_unlock(&instance->serialize);
|
|
|
|
complete_and_exit(&instance->thread_exited, ret);
|
|
}
|
|
|
|
static int usbatm_heavy_init(struct usbatm_data *instance)
|
|
{
|
|
struct task_struct *t;
|
|
|
|
t = kthread_create(usbatm_do_heavy_init, instance, "%s",
|
|
instance->driver->driver_name);
|
|
if (IS_ERR(t)) {
|
|
usb_err(instance, "%s: failed to create kernel_thread (%ld)!\n",
|
|
__func__, PTR_ERR(t));
|
|
return PTR_ERR(t);
|
|
}
|
|
|
|
instance->thread = t;
|
|
wake_up_process(t);
|
|
wait_for_completion(&instance->thread_started);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void usbatm_tasklet_schedule(struct timer_list *t)
|
|
{
|
|
struct usbatm_channel *channel = from_timer(channel, t, delay);
|
|
|
|
tasklet_schedule(&channel->tasklet);
|
|
}
|
|
|
|
static void usbatm_init_channel(struct usbatm_channel *channel)
|
|
{
|
|
spin_lock_init(&channel->lock);
|
|
INIT_LIST_HEAD(&channel->list);
|
|
timer_setup(&channel->delay, usbatm_tasklet_schedule, 0);
|
|
}
|
|
|
|
int usbatm_usb_probe(struct usb_interface *intf, const struct usb_device_id *id,
|
|
struct usbatm_driver *driver)
|
|
{
|
|
struct device *dev = &intf->dev;
|
|
struct usb_device *usb_dev = interface_to_usbdev(intf);
|
|
struct usbatm_data *instance;
|
|
char *buf;
|
|
int error = -ENOMEM;
|
|
int i, length;
|
|
unsigned int maxpacket, num_packets;
|
|
|
|
/* instance init */
|
|
instance = kzalloc(sizeof(*instance) + sizeof(struct urb *) * (num_rcv_urbs + num_snd_urbs), GFP_KERNEL);
|
|
if (!instance)
|
|
return -ENOMEM;
|
|
|
|
/* public fields */
|
|
|
|
instance->driver = driver;
|
|
strlcpy(instance->driver_name, driver->driver_name,
|
|
sizeof(instance->driver_name));
|
|
|
|
instance->usb_dev = usb_dev;
|
|
instance->usb_intf = intf;
|
|
|
|
buf = instance->description;
|
|
length = sizeof(instance->description);
|
|
|
|
if ((i = usb_string(usb_dev, usb_dev->descriptor.iProduct, buf, length)) < 0)
|
|
goto bind;
|
|
|
|
buf += i;
|
|
length -= i;
|
|
|
|
i = scnprintf(buf, length, " (");
|
|
buf += i;
|
|
length -= i;
|
|
|
|
if (length <= 0 || (i = usb_make_path(usb_dev, buf, length)) < 0)
|
|
goto bind;
|
|
|
|
buf += i;
|
|
length -= i;
|
|
|
|
snprintf(buf, length, ")");
|
|
|
|
bind:
|
|
if (driver->bind && (error = driver->bind(instance, intf, id)) < 0) {
|
|
dev_err(dev, "%s: bind failed: %d!\n", __func__, error);
|
|
goto fail_free;
|
|
}
|
|
|
|
/* private fields */
|
|
|
|
kref_init(&instance->refcount); /* dropped in usbatm_usb_disconnect */
|
|
mutex_init(&instance->serialize);
|
|
|
|
instance->thread = NULL;
|
|
init_completion(&instance->thread_started);
|
|
init_completion(&instance->thread_exited);
|
|
|
|
INIT_LIST_HEAD(&instance->vcc_list);
|
|
skb_queue_head_init(&instance->sndqueue);
|
|
|
|
usbatm_init_channel(&instance->rx_channel);
|
|
usbatm_init_channel(&instance->tx_channel);
|
|
tasklet_init(&instance->rx_channel.tasklet, usbatm_rx_process, (unsigned long)instance);
|
|
tasklet_init(&instance->tx_channel.tasklet, usbatm_tx_process, (unsigned long)instance);
|
|
instance->rx_channel.stride = ATM_CELL_SIZE + driver->rx_padding;
|
|
instance->tx_channel.stride = ATM_CELL_SIZE + driver->tx_padding;
|
|
instance->rx_channel.usbatm = instance->tx_channel.usbatm = instance;
|
|
|
|
if ((instance->flags & UDSL_USE_ISOC) && driver->isoc_in)
|
|
instance->rx_channel.endpoint = usb_rcvisocpipe(usb_dev, driver->isoc_in);
|
|
else
|
|
instance->rx_channel.endpoint = usb_rcvbulkpipe(usb_dev, driver->bulk_in);
|
|
|
|
instance->tx_channel.endpoint = usb_sndbulkpipe(usb_dev, driver->bulk_out);
|
|
|
|
/* tx buffer size must be a positive multiple of the stride */
|
|
instance->tx_channel.buf_size = max(instance->tx_channel.stride,
|
|
snd_buf_bytes - (snd_buf_bytes % instance->tx_channel.stride));
|
|
|
|
/* rx buffer size must be a positive multiple of the endpoint maxpacket */
|
|
maxpacket = usb_maxpacket(usb_dev, instance->rx_channel.endpoint, 0);
|
|
|
|
if ((maxpacket < 1) || (maxpacket > UDSL_MAX_BUF_SIZE)) {
|
|
dev_err(dev, "%s: invalid endpoint %02x!\n", __func__,
|
|
usb_pipeendpoint(instance->rx_channel.endpoint));
|
|
error = -EINVAL;
|
|
goto fail_unbind;
|
|
}
|
|
|
|
num_packets = max(1U, (rcv_buf_bytes + maxpacket / 2) / maxpacket); /* round */
|
|
|
|
if (num_packets * maxpacket > UDSL_MAX_BUF_SIZE)
|
|
num_packets--;
|
|
|
|
instance->rx_channel.buf_size = num_packets * maxpacket;
|
|
instance->rx_channel.packet_size = maxpacket;
|
|
|
|
for (i = 0; i < 2; i++) {
|
|
struct usbatm_channel *channel = i ?
|
|
&instance->tx_channel : &instance->rx_channel;
|
|
|
|
dev_dbg(dev, "%s: using %d byte buffer for %s channel 0x%p\n",
|
|
__func__, channel->buf_size, i ? "tx" : "rx", channel);
|
|
}
|
|
|
|
/* initialize urbs */
|
|
|
|
for (i = 0; i < num_rcv_urbs + num_snd_urbs; i++) {
|
|
u8 *buffer;
|
|
struct usbatm_channel *channel = i < num_rcv_urbs ?
|
|
&instance->rx_channel : &instance->tx_channel;
|
|
struct urb *urb;
|
|
unsigned int iso_packets = usb_pipeisoc(channel->endpoint) ? channel->buf_size / channel->packet_size : 0;
|
|
|
|
urb = usb_alloc_urb(iso_packets, GFP_KERNEL);
|
|
if (!urb) {
|
|
error = -ENOMEM;
|
|
goto fail_unbind;
|
|
}
|
|
|
|
instance->urbs[i] = urb;
|
|
|
|
/* zero the tx padding to avoid leaking information */
|
|
buffer = kzalloc(channel->buf_size, GFP_KERNEL);
|
|
if (!buffer) {
|
|
error = -ENOMEM;
|
|
goto fail_unbind;
|
|
}
|
|
|
|
usb_fill_bulk_urb(urb, instance->usb_dev, channel->endpoint,
|
|
buffer, channel->buf_size, usbatm_complete, channel);
|
|
if (iso_packets) {
|
|
int j;
|
|
urb->interval = 1;
|
|
urb->transfer_flags = URB_ISO_ASAP;
|
|
urb->number_of_packets = iso_packets;
|
|
for (j = 0; j < iso_packets; j++) {
|
|
urb->iso_frame_desc[j].offset = channel->packet_size * j;
|
|
urb->iso_frame_desc[j].length = channel->packet_size;
|
|
}
|
|
}
|
|
|
|
/* put all tx URBs on the list of spares */
|
|
if (i >= num_rcv_urbs)
|
|
list_add_tail(&urb->urb_list, &channel->list);
|
|
|
|
vdbg(&intf->dev, "%s: alloced buffer 0x%p buf size %u urb 0x%p",
|
|
__func__, urb->transfer_buffer, urb->transfer_buffer_length, urb);
|
|
}
|
|
|
|
instance->cached_vpi = ATM_VPI_UNSPEC;
|
|
instance->cached_vci = ATM_VCI_UNSPEC;
|
|
instance->cell_buf = kmalloc(instance->rx_channel.stride, GFP_KERNEL);
|
|
|
|
if (!instance->cell_buf) {
|
|
error = -ENOMEM;
|
|
goto fail_unbind;
|
|
}
|
|
|
|
if (!(instance->flags & UDSL_SKIP_HEAVY_INIT) && driver->heavy_init) {
|
|
error = usbatm_heavy_init(instance);
|
|
} else {
|
|
complete(&instance->thread_exited); /* pretend that heavy_init was run */
|
|
error = usbatm_atm_init(instance);
|
|
}
|
|
|
|
if (error < 0)
|
|
goto fail_unbind;
|
|
|
|
usb_get_dev(usb_dev);
|
|
usb_set_intfdata(intf, instance);
|
|
|
|
return 0;
|
|
|
|
fail_unbind:
|
|
if (instance->driver->unbind)
|
|
instance->driver->unbind(instance, intf);
|
|
fail_free:
|
|
kfree(instance->cell_buf);
|
|
|
|
for (i = 0; i < num_rcv_urbs + num_snd_urbs; i++) {
|
|
if (instance->urbs[i])
|
|
kfree(instance->urbs[i]->transfer_buffer);
|
|
usb_free_urb(instance->urbs[i]);
|
|
}
|
|
|
|
kfree(instance);
|
|
|
|
return error;
|
|
}
|
|
EXPORT_SYMBOL_GPL(usbatm_usb_probe);
|
|
|
|
void usbatm_usb_disconnect(struct usb_interface *intf)
|
|
{
|
|
struct device *dev = &intf->dev;
|
|
struct usbatm_data *instance = usb_get_intfdata(intf);
|
|
struct usbatm_vcc_data *vcc_data;
|
|
int i;
|
|
|
|
if (!instance) {
|
|
dev_dbg(dev, "%s: NULL instance!\n", __func__);
|
|
return;
|
|
}
|
|
|
|
usb_set_intfdata(intf, NULL);
|
|
|
|
mutex_lock(&instance->serialize);
|
|
instance->disconnected = 1;
|
|
if (instance->thread != NULL)
|
|
send_sig(SIGTERM, instance->thread, 1);
|
|
mutex_unlock(&instance->serialize);
|
|
|
|
wait_for_completion(&instance->thread_exited);
|
|
|
|
mutex_lock(&instance->serialize);
|
|
list_for_each_entry(vcc_data, &instance->vcc_list, list)
|
|
vcc_release_async(vcc_data->vcc, -EPIPE);
|
|
mutex_unlock(&instance->serialize);
|
|
|
|
tasklet_disable(&instance->rx_channel.tasklet);
|
|
tasklet_disable(&instance->tx_channel.tasklet);
|
|
|
|
for (i = 0; i < num_rcv_urbs + num_snd_urbs; i++)
|
|
usb_kill_urb(instance->urbs[i]);
|
|
|
|
del_timer_sync(&instance->rx_channel.delay);
|
|
del_timer_sync(&instance->tx_channel.delay);
|
|
|
|
/* turn usbatm_[rt]x_process into something close to a no-op */
|
|
/* no need to take the spinlock */
|
|
INIT_LIST_HEAD(&instance->rx_channel.list);
|
|
INIT_LIST_HEAD(&instance->tx_channel.list);
|
|
|
|
tasklet_enable(&instance->rx_channel.tasklet);
|
|
tasklet_enable(&instance->tx_channel.tasklet);
|
|
|
|
if (instance->atm_dev && instance->driver->atm_stop)
|
|
instance->driver->atm_stop(instance, instance->atm_dev);
|
|
|
|
if (instance->driver->unbind)
|
|
instance->driver->unbind(instance, intf);
|
|
|
|
instance->driver_data = NULL;
|
|
|
|
for (i = 0; i < num_rcv_urbs + num_snd_urbs; i++) {
|
|
kfree(instance->urbs[i]->transfer_buffer);
|
|
usb_free_urb(instance->urbs[i]);
|
|
}
|
|
|
|
kfree(instance->cell_buf);
|
|
|
|
/* ATM finalize */
|
|
if (instance->atm_dev) {
|
|
atm_dev_deregister(instance->atm_dev);
|
|
instance->atm_dev = NULL;
|
|
}
|
|
|
|
usbatm_put_instance(instance); /* taken in usbatm_usb_probe */
|
|
}
|
|
EXPORT_SYMBOL_GPL(usbatm_usb_disconnect);
|
|
|
|
|
|
/***********
|
|
** init **
|
|
***********/
|
|
|
|
static int __init usbatm_usb_init(void)
|
|
{
|
|
if (sizeof(struct usbatm_control) > FIELD_SIZEOF(struct sk_buff, cb)) {
|
|
printk(KERN_ERR "%s unusable with this kernel!\n", usbatm_driver_name);
|
|
return -EIO;
|
|
}
|
|
|
|
if ((num_rcv_urbs > UDSL_MAX_RCV_URBS)
|
|
|| (num_snd_urbs > UDSL_MAX_SND_URBS)
|
|
|| (rcv_buf_bytes < 1)
|
|
|| (rcv_buf_bytes > UDSL_MAX_BUF_SIZE)
|
|
|| (snd_buf_bytes < 1)
|
|
|| (snd_buf_bytes > UDSL_MAX_BUF_SIZE))
|
|
return -EINVAL;
|
|
|
|
return 0;
|
|
}
|
|
module_init(usbatm_usb_init);
|
|
|
|
static void __exit usbatm_usb_exit(void)
|
|
{
|
|
}
|
|
module_exit(usbatm_usb_exit);
|
|
|
|
MODULE_AUTHOR(DRIVER_AUTHOR);
|
|
MODULE_DESCRIPTION(DRIVER_DESC);
|
|
MODULE_LICENSE("GPL");
|
|
|
|
/************
|
|
** debug **
|
|
************/
|
|
|
|
#ifdef VERBOSE_DEBUG
|
|
static int usbatm_print_packet(struct usbatm_data *instance,
|
|
const unsigned char *data, int len)
|
|
{
|
|
unsigned char buffer[256];
|
|
int i = 0, j = 0;
|
|
|
|
for (i = 0; i < len;) {
|
|
buffer[0] = '\0';
|
|
sprintf(buffer, "%.3d :", i);
|
|
for (j = 0; (j < 16) && (i < len); j++, i++)
|
|
sprintf(buffer, "%s %2.2x", buffer, data[i]);
|
|
dev_dbg(&instance->usb_intf->dev, "%s", buffer);
|
|
}
|
|
return i;
|
|
}
|
|
#endif
|