| /****************************************************************************** |
| * 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 |
| * |
| * This program is free software; you can redistribute it and/or modify it |
| * under the terms of the GNU General Public License as published by the Free |
| * Software Foundation; either version 2 of the License, or (at your option) |
| * any later version. |
| * |
| * This program is distributed in the hope that it will be useful, but WITHOUT |
| * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
| * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for |
| * more details. |
| * |
| * You should have received a copy of the GNU General Public License along with |
| * this program; if not, write to the Free Software Foundation, Inc., 59 |
| * Temple Place - Suite 330, Boston, MA 02111-1307, USA. |
| * |
| ******************************************************************************/ |
| |
| /* |
| * Written by Johan Verrept, Duncan Sands (duncan.sands@free.fr) 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 (oliver@neukum.name) |
| * |
| * 1.5A: - Version for inclusion in 2.5 series kernel |
| * - Modifications by Richard Purdie (rpurdie@rpsys.net) |
| * - 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 stephen.robinson@zen.co.uk) |
| * |
| * 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 <asm/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.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(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 <duncan.sands@free.fr>" |
| #define DRIVER_VERSION "1.10" |
| #define DRIVER_DESC "Generic USB ATM/DSL I/O, version " DRIVER_VERSION |
| |
| 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 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); |
| |
| /* usually in_interrupt(), but not always */ |
| 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); |
| |
| vdbg("%s: vpi %hd, vci %d, pti %d", __func__, vpi, vci, pti); |
| |
| 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); |
| UDSL_ASSERT(instance, sarb->tail + ATM_CELL_PAYLOAD <= sarb->end); |
| } |
| |
| 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("%s: got packet (length: %u, pdu_length: %u, vcc: 0x%p)", __func__, length, pdu_length, vcc); |
| |
| if (!(skb = dev_alloc_skb(length))) { |
| 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("%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("%s: sending skb 0x%p, skb->len %u, skb->truesize %u", |
| __func__, skb, skb->len, skb->truesize); |
| |
| PACKETDEBUG(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; |
| |
| UDSL_ASSERT(instance, buf_usage <= stride); |
| |
| 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; |
| |
| vdbg("%s: skb->len=%d, avail_space=%u", __func__, skb->len, avail_space); |
| UDSL_ASSERT(instance, !(avail_space % 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(unsigned long data) |
| { |
| struct usbatm_data *instance = (struct usbatm_data *)data; |
| struct urb *urb; |
| |
| while ((urb = usbatm_pop_urb(&instance->rx_channel))) { |
| vdbg("%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; |
| |
| UDSL_ASSERT(instance, actual_length <= packet_size); |
| |
| 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("%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; |
| |
| atm_dbg(instance, "%s entered\n", __func__); |
| 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); |
| atm_dbg(instance, "%s done\n", __func__); |
| } |
| |
| 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; |
| |
| vdbg("%s called (skb 0x%p, len %u)", __func__, skb, skb->len); |
| |
| /* racy disconnection check - fine */ |
| if (!instance || instance->disconnected) { |
| #ifdef 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(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); |
| |
| usb_dbg(instance, "%s\n", __func__); |
| |
| 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) |
| { |
| usb_dbg(instance, "%s\n", __func__); |
| |
| kref_get(&instance->refcount); |
| } |
| |
| static void usbatm_put_instance(struct usbatm_data *instance) |
| { |
| usb_dbg(instance, "%s\n", __func__); |
| |
| 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; |
| |
| usb_dbg(instance, "%s\n", __func__); |
| 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; |
| |
| atm_dbg(instance, "%s: vpi %hd, vci %d\n", __func__, vpi, vci); |
| |
| /* 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; |
| } |
| |
| if (!(new = kzalloc(sizeof(struct usbatm_vcc_data), GFP_KERNEL))) { |
| atm_err(instance, "%s: no memory for vcc_data!\n", __func__); |
| 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; |
| |
| atm_dbg(instance, "%s entered\n", __func__); |
| |
| atm_dbg(instance, "%s: deallocating vcc 0x%p with vpi %d vci %d\n", |
| __func__, vcc_data, vcc_data->vpi, vcc_data->vci); |
| |
| 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); |
| |
| atm_dbg(instance, "%s successful\n", __func__); |
| } |
| |
| 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, |
| 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(unsigned long data) |
| { |
| tasklet_schedule((struct tasklet_struct *) data); |
| } |
| |
| static void usbatm_init_channel(struct usbatm_channel *channel) |
| { |
| spin_lock_init(&channel->lock); |
| INIT_LIST_HEAD(&channel->list); |
| channel->delay.function = usbatm_tasklet_schedule; |
| channel->delay.data = (unsigned long) &channel->tasklet; |
| init_timer(&channel->delay); |
| } |
| |
| 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; |
| |
| dev_dbg(dev, "%s: trying driver %s with vendor=%04x, product=%04x, ifnum %2d\n", |
| __func__, driver->driver_name, |
| le16_to_cpu(usb_dev->descriptor.idVendor), |
| le16_to_cpu(usb_dev->descriptor.idProduct), |
| intf->altsetting->desc.bInterfaceNumber); |
| |
| /* instance init */ |
| instance = kzalloc(sizeof(*instance) + sizeof(struct urb *) * (num_rcv_urbs + num_snd_urbs), GFP_KERNEL); |
| if (!instance) { |
| dev_err(dev, "%s: no memory for instance data!\n", __func__); |
| return -ENOMEM; |
| } |
| |
| /* public fields */ |
| |
| instance->driver = driver; |
| snprintf(instance->driver_name, sizeof(instance->driver_name), driver->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; |
| |
| #ifdef DEBUG |
| 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); |
| } |
| #endif |
| |
| /* 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; |
| |
| UDSL_ASSERT(instance, !usb_pipeisoc(channel->endpoint) || usb_pipein(channel->endpoint)); |
| |
| urb = usb_alloc_urb(iso_packets, GFP_KERNEL); |
| if (!urb) { |
| dev_err(dev, "%s: no memory for urb %d!\n", __func__, i); |
| 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) { |
| dev_err(dev, "%s: no memory for buffer %d!\n", __func__, i); |
| 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("%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) { |
| dev_err(dev, "%s: no memory for cell buffer!\n", __func__); |
| 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; |
| |
| dev_dbg(dev, "%s entered\n", __func__); |
| |
| 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"); |
| MODULE_VERSION(DRIVER_VERSION); |
| |
| /************ |
| ** debug ** |
| ************/ |
| |
| #ifdef VERBOSE_DEBUG |
| static int usbatm_print_packet(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]); |
| dbg("%s", buffer); |
| } |
| return i; |
| } |
| #endif |