forked from Qortal/Brooklyn
You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
1326 lines
35 KiB
1326 lines
35 KiB
// SPDX-License-Identifier: GPL-2.0+ |
|
/****************************************************************************** |
|
* usbatm.c - Generic USB xDSL driver core |
|
* |
|
* Copyright (C) 2001, Alcatel |
|
* Copyright (C) 2003, Duncan Sands, SolNegro, Josep Comas |
|
* Copyright (C) 2004, David Woodhouse, Roman Kagan |
|
******************************************************************************/ |
|
|
|
/* |
|
* Written by Johan Verrept, Duncan Sands ([email protected]) and David Woodhouse |
|
* |
|
* 1.7+: - See the check-in logs |
|
* |
|
* 1.6: - No longer opens a connection if the firmware is not loaded |
|
* - Added support for the speedtouch 330 |
|
* - Removed the limit on the number of devices |
|
* - Module now autoloads on device plugin |
|
* - Merged relevant parts of sarlib |
|
* - Replaced the kernel thread with a tasklet |
|
* - New packet transmission code |
|
* - Changed proc file contents |
|
* - Fixed all known SMP races |
|
* - Many fixes and cleanups |
|
* - Various fixes by Oliver Neukum ([email protected]) |
|
* |
|
* 1.5A: - Version for inclusion in 2.5 series kernel |
|
* - Modifications by Richard Purdie ([email protected]) |
|
* - made compatible with kernel 2.5.6 onwards by changing |
|
* usbatm_usb_send_data_context->urb to a pointer and adding code |
|
* to alloc and free it |
|
* - remove_wait_queue() added to usbatm_atm_processqueue_thread() |
|
* |
|
* 1.5: - fixed memory leak when atmsar_decode_aal5 returned NULL. |
|
* (reported by [email protected]) |
|
* |
|
* 1.4: - changed the spin_lock() under interrupt to spin_lock_irqsave() |
|
* - unlink all active send urbs of a vcc that is being closed. |
|
* |
|
* 1.3.1: - added the version number |
|
* |
|
* 1.3: - Added multiple send urb support |
|
* - fixed memory leak and vcc->tx_inuse starvation bug |
|
* when not enough memory left in vcc. |
|
* |
|
* 1.2: - Fixed race condition in usbatm_usb_send_data() |
|
* 1.1: - Turned off packet debugging |
|
* |
|
*/ |
|
|
|
#include "usbatm.h" |
|
|
|
#include <linux/uaccess.h> |
|
#include <linux/crc32.h> |
|
#include <linux/errno.h> |
|
#include <linux/init.h> |
|
#include <linux/interrupt.h> |
|
#include <linux/kernel.h> |
|
#include <linux/module.h> |
|
#include <linux/moduleparam.h> |
|
#include <linux/netdevice.h> |
|
#include <linux/proc_fs.h> |
|
#include <linux/sched/signal.h> |
|
#include <linux/signal.h> |
|
#include <linux/slab.h> |
|
#include <linux/stat.h> |
|
#include <linux/timer.h> |
|
#include <linux/wait.h> |
|
#include <linux/kthread.h> |
|
#include <linux/ratelimit.h> |
|
|
|
#ifdef VERBOSE_DEBUG |
|
static int usbatm_print_packet(struct usbatm_data *instance, const unsigned char *data, int len); |
|
#define PACKETDEBUG(arg...) usbatm_print_packet(arg) |
|
#define vdbg(arg...) dev_dbg(arg) |
|
#else |
|
#define PACKETDEBUG(arg...) |
|
#define vdbg(arg...) |
|
#endif |
|
|
|
#define DRIVER_AUTHOR "Johan Verrept, Duncan Sands <[email protected]>" |
|
#define DRIVER_DESC "Generic USB ATM/DSL I/O" |
|
|
|
static const char usbatm_driver_name[] = "usbatm"; |
|
|
|
#define UDSL_MAX_RCV_URBS 16 |
|
#define UDSL_MAX_SND_URBS 16 |
|
#define UDSL_MAX_BUF_SIZE 65536 |
|
#define UDSL_DEFAULT_RCV_URBS 4 |
|
#define UDSL_DEFAULT_SND_URBS 4 |
|
#define UDSL_DEFAULT_RCV_BUF_SIZE 3392 /* 64 * ATM_CELL_SIZE */ |
|
#define UDSL_DEFAULT_SND_BUF_SIZE 3392 /* 64 * ATM_CELL_SIZE */ |
|
|
|
#define ATM_CELL_HEADER (ATM_CELL_SIZE - ATM_CELL_PAYLOAD) |
|
|
|
#define THROTTLE_MSECS 100 /* delay to recover processing after urb submission fails */ |
|
|
|
static unsigned int num_rcv_urbs = UDSL_DEFAULT_RCV_URBS; |
|
static unsigned int num_snd_urbs = UDSL_DEFAULT_SND_URBS; |
|
static unsigned int rcv_buf_bytes = UDSL_DEFAULT_RCV_BUF_SIZE; |
|
static unsigned int snd_buf_bytes = UDSL_DEFAULT_SND_BUF_SIZE; |
|
|
|
module_param(num_rcv_urbs, uint, S_IRUGO); |
|
MODULE_PARM_DESC(num_rcv_urbs, |
|
"Number of urbs used for reception (range: 0-" |
|
__MODULE_STRING(UDSL_MAX_RCV_URBS) ", default: " |
|
__MODULE_STRING(UDSL_DEFAULT_RCV_URBS) ")"); |
|
|
|
module_param(num_snd_urbs, uint, S_IRUGO); |
|
MODULE_PARM_DESC(num_snd_urbs, |
|
"Number of urbs used for transmission (range: 0-" |
|
__MODULE_STRING(UDSL_MAX_SND_URBS) ", default: " |
|
__MODULE_STRING(UDSL_DEFAULT_SND_URBS) ")"); |
|
|
|
module_param(rcv_buf_bytes, uint, S_IRUGO); |
|
MODULE_PARM_DESC(rcv_buf_bytes, |
|
"Size of the buffers used for reception, in bytes (range: 1-" |
|
__MODULE_STRING(UDSL_MAX_BUF_SIZE) ", default: " |
|
__MODULE_STRING(UDSL_DEFAULT_RCV_BUF_SIZE) ")"); |
|
|
|
module_param(snd_buf_bytes, uint, S_IRUGO); |
|
MODULE_PARM_DESC(snd_buf_bytes, |
|
"Size of the buffers used for transmission, in bytes (range: 1-" |
|
__MODULE_STRING(UDSL_MAX_BUF_SIZE) ", default: " |
|
__MODULE_STRING(UDSL_DEFAULT_SND_BUF_SIZE) ")"); |
|
|
|
|
|
/* receive */ |
|
|
|
struct usbatm_vcc_data { |
|
/* vpi/vci lookup */ |
|
struct list_head list; |
|
short vpi; |
|
int vci; |
|
struct atm_vcc *vcc; |
|
|
|
/* raw cell reassembly */ |
|
struct sk_buff *sarb; |
|
}; |
|
|
|
|
|
/* send */ |
|
|
|
struct usbatm_control { |
|
struct atm_skb_data atm; |
|
u32 len; |
|
u32 crc; |
|
}; |
|
|
|
#define UDSL_SKB(x) ((struct usbatm_control *)(x)->cb) |
|
|
|
|
|
/* ATM */ |
|
|
|
static void usbatm_atm_dev_close(struct atm_dev *atm_dev); |
|
static int usbatm_atm_open(struct atm_vcc *vcc); |
|
static void usbatm_atm_close(struct atm_vcc *vcc); |
|
static int usbatm_atm_ioctl(struct atm_dev *atm_dev, unsigned int cmd, void __user *arg); |
|
static int usbatm_atm_send(struct atm_vcc *vcc, struct sk_buff *skb); |
|
static int usbatm_atm_proc_read(struct atm_dev *atm_dev, loff_t *pos, char *page); |
|
|
|
static const struct atmdev_ops usbatm_atm_devops = { |
|
.dev_close = usbatm_atm_dev_close, |
|
.open = usbatm_atm_open, |
|
.close = usbatm_atm_close, |
|
.ioctl = usbatm_atm_ioctl, |
|
.send = usbatm_atm_send, |
|
.proc_read = usbatm_atm_proc_read, |
|
.owner = THIS_MODULE, |
|
}; |
|
|
|
|
|
/*********** |
|
** misc ** |
|
***********/ |
|
|
|
static inline unsigned int usbatm_pdu_length(unsigned int length) |
|
{ |
|
length += ATM_CELL_PAYLOAD - 1 + ATM_AAL5_TRAILER; |
|
return length - length % ATM_CELL_PAYLOAD; |
|
} |
|
|
|
static inline void usbatm_pop(struct atm_vcc *vcc, struct sk_buff *skb) |
|
{ |
|
if (vcc->pop) |
|
vcc->pop(vcc, skb); |
|
else |
|
dev_kfree_skb_any(skb); |
|
} |
|
|
|
|
|
/*********** |
|
** urbs ** |
|
************/ |
|
|
|
static struct urb *usbatm_pop_urb(struct usbatm_channel *channel) |
|
{ |
|
struct urb *urb; |
|
|
|
spin_lock_irq(&channel->lock); |
|
if (list_empty(&channel->list)) { |
|
spin_unlock_irq(&channel->lock); |
|
return NULL; |
|
} |
|
|
|
urb = list_entry(channel->list.next, struct urb, urb_list); |
|
list_del(&urb->urb_list); |
|
spin_unlock_irq(&channel->lock); |
|
|
|
return urb; |
|
} |
|
|
|
static int usbatm_submit_urb(struct urb *urb) |
|
{ |
|
struct usbatm_channel *channel = urb->context; |
|
int ret; |
|
|
|
/* vdbg("%s: submitting urb 0x%p, size %u", |
|
__func__, urb, urb->transfer_buffer_length); */ |
|
|
|
ret = usb_submit_urb(urb, GFP_ATOMIC); |
|
if (ret) { |
|
if (printk_ratelimit()) |
|
atm_warn(channel->usbatm, "%s: urb 0x%p submission failed (%d)!\n", |
|
__func__, urb, ret); |
|
|
|
/* consider all errors transient and return the buffer back to the queue */ |
|
urb->status = -EAGAIN; |
|
spin_lock_irq(&channel->lock); |
|
|
|
/* must add to the front when sending; doesn't matter when receiving */ |
|
list_add(&urb->urb_list, &channel->list); |
|
|
|
spin_unlock_irq(&channel->lock); |
|
|
|
/* make sure the channel doesn't stall */ |
|
mod_timer(&channel->delay, jiffies + msecs_to_jiffies(THROTTLE_MSECS)); |
|
} |
|
|
|
return ret; |
|
} |
|
|
|
static void usbatm_complete(struct urb *urb) |
|
{ |
|
struct usbatm_channel *channel = urb->context; |
|
unsigned long flags; |
|
int status = urb->status; |
|
|
|
/* vdbg("%s: urb 0x%p, status %d, actual_length %d", |
|
__func__, urb, status, urb->actual_length); */ |
|
|
|
/* Can be invoked from task context, protect against interrupts */ |
|
spin_lock_irqsave(&channel->lock, flags); |
|
|
|
/* must add to the back when receiving; doesn't matter when sending */ |
|
list_add_tail(&urb->urb_list, &channel->list); |
|
|
|
spin_unlock_irqrestore(&channel->lock, flags); |
|
|
|
if (unlikely(status) && |
|
(!(channel->usbatm->flags & UDSL_IGNORE_EILSEQ) || |
|
status != -EILSEQ)) { |
|
if (status == -ESHUTDOWN) |
|
return; |
|
|
|
if (printk_ratelimit()) |
|
atm_warn(channel->usbatm, "%s: urb 0x%p failed (%d)!\n", |
|
__func__, urb, status); |
|
/* throttle processing in case of an error */ |
|
mod_timer(&channel->delay, jiffies + msecs_to_jiffies(THROTTLE_MSECS)); |
|
} else |
|
tasklet_schedule(&channel->tasklet); |
|
} |
|
|
|
|
|
/************* |
|
** decode ** |
|
*************/ |
|
|
|
static inline struct usbatm_vcc_data *usbatm_find_vcc(struct usbatm_data *instance, |
|
short vpi, int vci) |
|
{ |
|
struct usbatm_vcc_data *vcc_data; |
|
|
|
list_for_each_entry(vcc_data, &instance->vcc_list, list) |
|
if ((vcc_data->vci == vci) && (vcc_data->vpi == vpi)) |
|
return vcc_data; |
|
return NULL; |
|
} |
|
|
|
static void usbatm_extract_one_cell(struct usbatm_data *instance, unsigned char *source) |
|
{ |
|
struct atm_vcc *vcc; |
|
struct sk_buff *sarb; |
|
short vpi = ((source[0] & 0x0f) << 4) | (source[1] >> 4); |
|
int vci = ((source[1] & 0x0f) << 12) | (source[2] << 4) | (source[3] >> 4); |
|
u8 pti = ((source[3] & 0xe) >> 1); |
|
|
|
if ((vci != instance->cached_vci) || (vpi != instance->cached_vpi)) { |
|
instance->cached_vpi = vpi; |
|
instance->cached_vci = vci; |
|
|
|
instance->cached_vcc = usbatm_find_vcc(instance, vpi, vci); |
|
|
|
if (!instance->cached_vcc) |
|
atm_rldbg(instance, "%s: unknown vpi/vci (%hd/%d)!\n", __func__, vpi, vci); |
|
} |
|
|
|
if (!instance->cached_vcc) |
|
return; |
|
|
|
vcc = instance->cached_vcc->vcc; |
|
|
|
/* OAM F5 end-to-end */ |
|
if (pti == ATM_PTI_E2EF5) { |
|
if (printk_ratelimit()) |
|
atm_warn(instance, "%s: OAM not supported (vpi %d, vci %d)!\n", |
|
__func__, vpi, vci); |
|
atomic_inc(&vcc->stats->rx_err); |
|
return; |
|
} |
|
|
|
sarb = instance->cached_vcc->sarb; |
|
|
|
if (sarb->tail + ATM_CELL_PAYLOAD > sarb->end) { |
|
atm_rldbg(instance, "%s: buffer overrun (sarb->len %u, vcc: 0x%p)!\n", |
|
__func__, sarb->len, vcc); |
|
/* discard cells already received */ |
|
skb_trim(sarb, 0); |
|
} |
|
|
|
memcpy(skb_tail_pointer(sarb), source + ATM_CELL_HEADER, ATM_CELL_PAYLOAD); |
|
__skb_put(sarb, ATM_CELL_PAYLOAD); |
|
|
|
if (pti & 1) { |
|
struct sk_buff *skb; |
|
unsigned int length; |
|
unsigned int pdu_length; |
|
|
|
length = (source[ATM_CELL_SIZE - 6] << 8) + source[ATM_CELL_SIZE - 5]; |
|
|
|
/* guard against overflow */ |
|
if (length > ATM_MAX_AAL5_PDU) { |
|
atm_rldbg(instance, "%s: bogus length %u (vcc: 0x%p)!\n", |
|
__func__, length, vcc); |
|
atomic_inc(&vcc->stats->rx_err); |
|
goto out; |
|
} |
|
|
|
pdu_length = usbatm_pdu_length(length); |
|
|
|
if (sarb->len < pdu_length) { |
|
atm_rldbg(instance, "%s: bogus pdu_length %u (sarb->len: %u, vcc: 0x%p)!\n", |
|
__func__, pdu_length, sarb->len, vcc); |
|
atomic_inc(&vcc->stats->rx_err); |
|
goto out; |
|
} |
|
|
|
if (crc32_be(~0, skb_tail_pointer(sarb) - pdu_length, pdu_length) != 0xc704dd7b) { |
|
atm_rldbg(instance, "%s: packet failed crc check (vcc: 0x%p)!\n", |
|
__func__, vcc); |
|
atomic_inc(&vcc->stats->rx_err); |
|
goto out; |
|
} |
|
|
|
vdbg(&instance->usb_intf->dev, |
|
"%s: got packet (length: %u, pdu_length: %u, vcc: 0x%p)", |
|
__func__, length, pdu_length, vcc); |
|
|
|
skb = dev_alloc_skb(length); |
|
if (!skb) { |
|
if (printk_ratelimit()) |
|
atm_err(instance, "%s: no memory for skb (length: %u)!\n", |
|
__func__, length); |
|
atomic_inc(&vcc->stats->rx_drop); |
|
goto out; |
|
} |
|
|
|
vdbg(&instance->usb_intf->dev, |
|
"%s: allocated new sk_buff (skb: 0x%p, skb->truesize: %u)", |
|
__func__, skb, skb->truesize); |
|
|
|
if (!atm_charge(vcc, skb->truesize)) { |
|
atm_rldbg(instance, "%s: failed atm_charge (skb->truesize: %u)!\n", |
|
__func__, skb->truesize); |
|
dev_kfree_skb_any(skb); |
|
goto out; /* atm_charge increments rx_drop */ |
|
} |
|
|
|
skb_copy_to_linear_data(skb, |
|
skb_tail_pointer(sarb) - pdu_length, |
|
length); |
|
__skb_put(skb, length); |
|
|
|
vdbg(&instance->usb_intf->dev, |
|
"%s: sending skb 0x%p, skb->len %u, skb->truesize %u", |
|
__func__, skb, skb->len, skb->truesize); |
|
|
|
PACKETDEBUG(instance, skb->data, skb->len); |
|
|
|
vcc->push(vcc, skb); |
|
|
|
atomic_inc(&vcc->stats->rx); |
|
out: |
|
skb_trim(sarb, 0); |
|
} |
|
} |
|
|
|
static void usbatm_extract_cells(struct usbatm_data *instance, |
|
unsigned char *source, unsigned int avail_data) |
|
{ |
|
unsigned int stride = instance->rx_channel.stride; |
|
unsigned int buf_usage = instance->buf_usage; |
|
|
|
/* extract cells from incoming data, taking into account that |
|
* the length of avail data may not be a multiple of stride */ |
|
|
|
if (buf_usage > 0) { |
|
/* we have a partially received atm cell */ |
|
unsigned char *cell_buf = instance->cell_buf; |
|
unsigned int space_left = stride - buf_usage; |
|
|
|
if (avail_data >= space_left) { |
|
/* add new data and process cell */ |
|
memcpy(cell_buf + buf_usage, source, space_left); |
|
source += space_left; |
|
avail_data -= space_left; |
|
usbatm_extract_one_cell(instance, cell_buf); |
|
instance->buf_usage = 0; |
|
} else { |
|
/* not enough data to fill the cell */ |
|
memcpy(cell_buf + buf_usage, source, avail_data); |
|
instance->buf_usage = buf_usage + avail_data; |
|
return; |
|
} |
|
} |
|
|
|
for (; avail_data >= stride; avail_data -= stride, source += stride) |
|
usbatm_extract_one_cell(instance, source); |
|
|
|
if (avail_data > 0) { |
|
/* length was not a multiple of stride - |
|
* save remaining data for next call */ |
|
memcpy(instance->cell_buf, source, avail_data); |
|
instance->buf_usage = avail_data; |
|
} |
|
} |
|
|
|
|
|
/************* |
|
** encode ** |
|
*************/ |
|
|
|
static unsigned int usbatm_write_cells(struct usbatm_data *instance, |
|
struct sk_buff *skb, |
|
u8 *target, unsigned int avail_space) |
|
{ |
|
struct usbatm_control *ctrl = UDSL_SKB(skb); |
|
struct atm_vcc *vcc = ctrl->atm.vcc; |
|
unsigned int bytes_written; |
|
unsigned int stride = instance->tx_channel.stride; |
|
|
|
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(struct tasklet_struct *t) |
|
{ |
|
struct usbatm_data *instance = from_tasklet(instance, t, |
|
rx_channel.tasklet); |
|
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(struct tasklet_struct *t) |
|
{ |
|
struct usbatm_data *instance = from_tasklet(instance, t, |
|
tx_channel.tasklet); |
|
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_setup(&instance->rx_channel.tasklet, usbatm_rx_process); |
|
tasklet_setup(&instance->tx_channel.tasklet, usbatm_tx_process); |
|
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) > sizeof_field(struct sk_buff, cb)) { |
|
pr_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
|
|
|