Duncan Sands | c59bba7 | 2005-05-11 20:24:03 +0200 | [diff] [blame] | 1 | /****************************************************************************** |
| 2 | * usbatm.c - Generic USB xDSL driver core |
| 3 | * |
| 4 | * Copyright (C) 2001, Alcatel |
| 5 | * Copyright (C) 2003, Duncan Sands, SolNegro, Josep Comas |
| 6 | * Copyright (C) 2004, David Woodhouse, Roman Kagan |
| 7 | * |
| 8 | * This program is free software; you can redistribute it and/or modify it |
| 9 | * under the terms of the GNU General Public License as published by the Free |
| 10 | * Software Foundation; either version 2 of the License, or (at your option) |
| 11 | * any later version. |
| 12 | * |
| 13 | * This program is distributed in the hope that it will be useful, but WITHOUT |
| 14 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
| 15 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for |
| 16 | * more details. |
| 17 | * |
| 18 | * You should have received a copy of the GNU General Public License along with |
| 19 | * this program; if not, write to the Free Software Foundation, Inc., 59 |
| 20 | * Temple Place - Suite 330, Boston, MA 02111-1307, USA. |
| 21 | * |
| 22 | ******************************************************************************/ |
| 23 | |
| 24 | /* |
| 25 | * Written by Johan Verrept, Duncan Sands (duncan.sands@free.fr) and David Woodhouse |
| 26 | * |
| 27 | * 1.7+: - See the check-in logs |
| 28 | * |
| 29 | * 1.6: - No longer opens a connection if the firmware is not loaded |
| 30 | * - Added support for the speedtouch 330 |
| 31 | * - Removed the limit on the number of devices |
| 32 | * - Module now autoloads on device plugin |
| 33 | * - Merged relevant parts of sarlib |
| 34 | * - Replaced the kernel thread with a tasklet |
| 35 | * - New packet transmission code |
| 36 | * - Changed proc file contents |
| 37 | * - Fixed all known SMP races |
| 38 | * - Many fixes and cleanups |
| 39 | * - Various fixes by Oliver Neukum (oliver@neukum.name) |
| 40 | * |
| 41 | * 1.5A: - Version for inclusion in 2.5 series kernel |
| 42 | * - Modifications by Richard Purdie (rpurdie@rpsys.net) |
| 43 | * - made compatible with kernel 2.5.6 onwards by changing |
| 44 | * usbatm_usb_send_data_context->urb to a pointer and adding code |
| 45 | * to alloc and free it |
| 46 | * - remove_wait_queue() added to usbatm_atm_processqueue_thread() |
| 47 | * |
| 48 | * 1.5: - fixed memory leak when atmsar_decode_aal5 returned NULL. |
| 49 | * (reported by stephen.robinson@zen.co.uk) |
| 50 | * |
| 51 | * 1.4: - changed the spin_lock() under interrupt to spin_lock_irqsave() |
| 52 | * - unlink all active send urbs of a vcc that is being closed. |
| 53 | * |
| 54 | * 1.3.1: - added the version number |
| 55 | * |
| 56 | * 1.3: - Added multiple send urb support |
| 57 | * - fixed memory leak and vcc->tx_inuse starvation bug |
| 58 | * when not enough memory left in vcc. |
| 59 | * |
| 60 | * 1.2: - Fixed race condition in usbatm_usb_send_data() |
| 61 | * 1.1: - Turned off packet debugging |
| 62 | * |
| 63 | */ |
| 64 | |
| 65 | #include "usbatm.h" |
| 66 | |
| 67 | #include <asm/uaccess.h> |
| 68 | #include <linux/crc32.h> |
| 69 | #include <linux/errno.h> |
| 70 | #include <linux/init.h> |
| 71 | #include <linux/interrupt.h> |
| 72 | #include <linux/kernel.h> |
| 73 | #include <linux/module.h> |
| 74 | #include <linux/moduleparam.h> |
| 75 | #include <linux/proc_fs.h> |
| 76 | #include <linux/sched.h> |
| 77 | #include <linux/signal.h> |
| 78 | #include <linux/slab.h> |
| 79 | #include <linux/smp_lock.h> |
| 80 | #include <linux/stat.h> |
| 81 | #include <linux/timer.h> |
| 82 | #include <linux/wait.h> |
| 83 | |
| 84 | #ifdef VERBOSE_DEBUG |
| 85 | static int usbatm_print_packet(const unsigned char *data, int len); |
| 86 | #define PACKETDEBUG(arg...) usbatm_print_packet (arg) |
| 87 | #define vdbg(arg...) dbg (arg) |
| 88 | #else |
| 89 | #define PACKETDEBUG(arg...) |
| 90 | #define vdbg(arg...) |
| 91 | #endif |
| 92 | |
| 93 | #define DRIVER_AUTHOR "Johan Verrept, Duncan Sands <duncan.sands@free.fr>" |
| 94 | #define DRIVER_VERSION "1.9" |
| 95 | #define DRIVER_DESC "Generic USB ATM/DSL I/O, version " DRIVER_VERSION |
| 96 | |
| 97 | static const char usbatm_driver_name[] = "usbatm"; |
| 98 | |
| 99 | #define UDSL_MAX_RCV_URBS 16 |
| 100 | #define UDSL_MAX_SND_URBS 16 |
| 101 | #define UDSL_MAX_RCV_BUF_SIZE 1024 /* ATM cells */ |
| 102 | #define UDSL_MAX_SND_BUF_SIZE 1024 /* ATM cells */ |
| 103 | #define UDSL_DEFAULT_RCV_URBS 4 |
| 104 | #define UDSL_DEFAULT_SND_URBS 4 |
| 105 | #define UDSL_DEFAULT_RCV_BUF_SIZE 64 /* ATM cells */ |
| 106 | #define UDSL_DEFAULT_SND_BUF_SIZE 64 /* ATM cells */ |
| 107 | |
| 108 | #define ATM_CELL_HEADER (ATM_CELL_SIZE - ATM_CELL_PAYLOAD) |
| 109 | |
| 110 | #define THROTTLE_MSECS 100 /* delay to recover processing after urb submission fails */ |
| 111 | |
| 112 | static unsigned int num_rcv_urbs = UDSL_DEFAULT_RCV_URBS; |
| 113 | static unsigned int num_snd_urbs = UDSL_DEFAULT_SND_URBS; |
| 114 | static unsigned int rcv_buf_size = UDSL_DEFAULT_RCV_BUF_SIZE; |
| 115 | static unsigned int snd_buf_size = UDSL_DEFAULT_SND_BUF_SIZE; |
| 116 | |
| 117 | module_param(num_rcv_urbs, uint, S_IRUGO); |
| 118 | MODULE_PARM_DESC(num_rcv_urbs, |
| 119 | "Number of urbs used for reception (range: 0-" |
| 120 | __MODULE_STRING(UDSL_MAX_RCV_URBS) ", default: " |
| 121 | __MODULE_STRING(UDSL_DEFAULT_RCV_URBS) ")"); |
| 122 | |
| 123 | module_param(num_snd_urbs, uint, S_IRUGO); |
| 124 | MODULE_PARM_DESC(num_snd_urbs, |
| 125 | "Number of urbs used for transmission (range: 0-" |
| 126 | __MODULE_STRING(UDSL_MAX_SND_URBS) ", default: " |
| 127 | __MODULE_STRING(UDSL_DEFAULT_SND_URBS) ")"); |
| 128 | |
| 129 | module_param(rcv_buf_size, uint, S_IRUGO); |
| 130 | MODULE_PARM_DESC(rcv_buf_size, |
| 131 | "Size of the buffers used for reception in ATM cells (range: 1-" |
| 132 | __MODULE_STRING(UDSL_MAX_RCV_BUF_SIZE) ", default: " |
| 133 | __MODULE_STRING(UDSL_DEFAULT_RCV_BUF_SIZE) ")"); |
| 134 | |
| 135 | module_param(snd_buf_size, uint, S_IRUGO); |
| 136 | MODULE_PARM_DESC(snd_buf_size, |
| 137 | "Size of the buffers used for transmission in ATM cells (range: 1-" |
| 138 | __MODULE_STRING(UDSL_MAX_SND_BUF_SIZE) ", default: " |
| 139 | __MODULE_STRING(UDSL_DEFAULT_SND_BUF_SIZE) ")"); |
| 140 | |
| 141 | |
| 142 | /* receive */ |
| 143 | |
| 144 | struct usbatm_vcc_data { |
| 145 | /* vpi/vci lookup */ |
| 146 | struct list_head list; |
| 147 | short vpi; |
| 148 | int vci; |
| 149 | struct atm_vcc *vcc; |
| 150 | |
| 151 | /* raw cell reassembly */ |
| 152 | struct sk_buff *sarb; |
| 153 | }; |
| 154 | |
| 155 | |
| 156 | /* send */ |
| 157 | |
| 158 | struct usbatm_control { |
| 159 | struct atm_skb_data atm; |
| 160 | u32 len; |
| 161 | u32 crc; |
| 162 | }; |
| 163 | |
| 164 | #define UDSL_SKB(x) ((struct usbatm_control *)(x)->cb) |
| 165 | |
| 166 | |
| 167 | /* ATM */ |
| 168 | |
| 169 | static void usbatm_atm_dev_close(struct atm_dev *dev); |
| 170 | static int usbatm_atm_open(struct atm_vcc *vcc); |
| 171 | static void usbatm_atm_close(struct atm_vcc *vcc); |
| 172 | static int usbatm_atm_ioctl(struct atm_dev *dev, unsigned int cmd, void __user * arg); |
| 173 | static int usbatm_atm_send(struct atm_vcc *vcc, struct sk_buff *skb); |
| 174 | static int usbatm_atm_proc_read(struct atm_dev *atm_dev, loff_t * pos, char *page); |
| 175 | |
| 176 | static struct atmdev_ops usbatm_atm_devops = { |
| 177 | .dev_close = usbatm_atm_dev_close, |
| 178 | .open = usbatm_atm_open, |
| 179 | .close = usbatm_atm_close, |
| 180 | .ioctl = usbatm_atm_ioctl, |
| 181 | .send = usbatm_atm_send, |
| 182 | .proc_read = usbatm_atm_proc_read, |
| 183 | .owner = THIS_MODULE, |
| 184 | }; |
| 185 | |
| 186 | |
| 187 | /*********** |
| 188 | ** misc ** |
| 189 | ***********/ |
| 190 | |
| 191 | static inline unsigned int usbatm_pdu_length(unsigned int length) |
| 192 | { |
| 193 | length += ATM_CELL_PAYLOAD - 1 + ATM_AAL5_TRAILER; |
| 194 | return length - length % ATM_CELL_PAYLOAD; |
| 195 | } |
| 196 | |
| 197 | static inline void usbatm_pop(struct atm_vcc *vcc, struct sk_buff *skb) |
| 198 | { |
| 199 | if (vcc->pop) |
| 200 | vcc->pop(vcc, skb); |
| 201 | else |
| 202 | dev_kfree_skb(skb); |
| 203 | } |
| 204 | |
| 205 | |
| 206 | /*********** |
| 207 | ** urbs ** |
| 208 | ************/ |
| 209 | |
Arjan van de Ven | 858119e | 2006-01-14 13:20:43 -0800 | [diff] [blame^] | 210 | static struct urb *usbatm_pop_urb(struct usbatm_channel *channel) |
Duncan Sands | c59bba7 | 2005-05-11 20:24:03 +0200 | [diff] [blame] | 211 | { |
| 212 | struct urb *urb; |
| 213 | |
| 214 | spin_lock_irq(&channel->lock); |
| 215 | if (list_empty(&channel->list)) { |
| 216 | spin_unlock_irq(&channel->lock); |
| 217 | return NULL; |
| 218 | } |
| 219 | |
| 220 | urb = list_entry(channel->list.next, struct urb, urb_list); |
| 221 | list_del(&urb->urb_list); |
| 222 | spin_unlock_irq(&channel->lock); |
| 223 | |
| 224 | return urb; |
| 225 | } |
| 226 | |
Arjan van de Ven | 858119e | 2006-01-14 13:20:43 -0800 | [diff] [blame^] | 227 | static int usbatm_submit_urb(struct urb *urb) |
Duncan Sands | c59bba7 | 2005-05-11 20:24:03 +0200 | [diff] [blame] | 228 | { |
| 229 | struct usbatm_channel *channel = urb->context; |
| 230 | int ret; |
| 231 | |
| 232 | vdbg("%s: submitting urb 0x%p, size %u", |
| 233 | __func__, urb, urb->transfer_buffer_length); |
| 234 | |
| 235 | ret = usb_submit_urb(urb, GFP_ATOMIC); |
| 236 | if (ret) { |
| 237 | atm_dbg(channel->usbatm, "%s: urb 0x%p submission failed (%d)!\n", |
| 238 | __func__, urb, ret); |
| 239 | |
| 240 | /* consider all errors transient and return the buffer back to the queue */ |
| 241 | urb->status = -EAGAIN; |
| 242 | spin_lock_irq(&channel->lock); |
| 243 | |
| 244 | /* must add to the front when sending; doesn't matter when receiving */ |
| 245 | list_add(&urb->urb_list, &channel->list); |
| 246 | |
| 247 | spin_unlock_irq(&channel->lock); |
| 248 | |
| 249 | /* make sure the channel doesn't stall */ |
| 250 | mod_timer(&channel->delay, jiffies + msecs_to_jiffies(THROTTLE_MSECS)); |
| 251 | } |
| 252 | |
| 253 | return ret; |
| 254 | } |
| 255 | |
| 256 | static void usbatm_complete(struct urb *urb, struct pt_regs *regs) |
| 257 | { |
| 258 | struct usbatm_channel *channel = urb->context; |
| 259 | unsigned long flags; |
| 260 | |
| 261 | vdbg("%s: urb 0x%p, status %d, actual_length %d", |
| 262 | __func__, urb, urb->status, urb->actual_length); |
| 263 | |
| 264 | /* usually in_interrupt(), but not always */ |
| 265 | spin_lock_irqsave(&channel->lock, flags); |
| 266 | |
| 267 | /* must add to the back when receiving; doesn't matter when sending */ |
| 268 | list_add_tail(&urb->urb_list, &channel->list); |
| 269 | |
| 270 | spin_unlock_irqrestore(&channel->lock, flags); |
| 271 | |
| 272 | if (unlikely(urb->status)) |
| 273 | /* throttle processing in case of an error */ |
| 274 | mod_timer(&channel->delay, jiffies + msecs_to_jiffies(THROTTLE_MSECS)); |
| 275 | else |
| 276 | tasklet_schedule(&channel->tasklet); |
| 277 | } |
| 278 | |
| 279 | |
| 280 | /************* |
| 281 | ** decode ** |
| 282 | *************/ |
| 283 | |
| 284 | static inline struct usbatm_vcc_data *usbatm_find_vcc(struct usbatm_data *instance, |
| 285 | short vpi, int vci) |
| 286 | { |
| 287 | struct usbatm_vcc_data *vcc; |
| 288 | |
| 289 | list_for_each_entry(vcc, &instance->vcc_list, list) |
| 290 | if ((vcc->vci == vci) && (vcc->vpi == vpi)) |
| 291 | return vcc; |
| 292 | return NULL; |
| 293 | } |
| 294 | |
| 295 | static void usbatm_extract_cells(struct usbatm_data *instance, |
| 296 | unsigned char *source, unsigned int avail_data) |
| 297 | { |
| 298 | struct usbatm_vcc_data *cached_vcc = NULL; |
| 299 | struct atm_vcc *vcc; |
| 300 | struct sk_buff *sarb; |
Duncan Sands | c59bba7 | 2005-05-11 20:24:03 +0200 | [diff] [blame] | 301 | unsigned int stride = instance->rx_channel.stride; |
| 302 | int vci, cached_vci = 0; |
| 303 | short vpi, cached_vpi = 0; |
| 304 | u8 pti; |
| 305 | |
| 306 | for (; avail_data >= stride; avail_data -= stride, source += stride) { |
| 307 | vpi = ((source[0] & 0x0f) << 4) | (source[1] >> 4); |
| 308 | vci = ((source[1] & 0x0f) << 12) | (source[2] << 4) | (source[3] >> 4); |
| 309 | pti = ((source[3] & 0xe) >> 1); |
| 310 | |
| 311 | vdbg("%s: vpi %hd, vci %d, pti %d", __func__, vpi, vci, pti); |
| 312 | |
Duncan Sands | e20d664 | 2005-05-26 14:32:51 +0200 | [diff] [blame] | 313 | if ((vci != cached_vci) || (vpi != cached_vpi)) { |
Duncan Sands | c59bba7 | 2005-05-11 20:24:03 +0200 | [diff] [blame] | 314 | cached_vpi = vpi; |
| 315 | cached_vci = vci; |
Duncan Sands | e20d664 | 2005-05-26 14:32:51 +0200 | [diff] [blame] | 316 | |
| 317 | cached_vcc = usbatm_find_vcc(instance, vpi, vci); |
| 318 | |
| 319 | if (!cached_vcc) |
| 320 | atm_dbg(instance, "%s: unknown vpi/vci (%hd/%d)!\n", __func__, vpi, vci); |
Duncan Sands | c59bba7 | 2005-05-11 20:24:03 +0200 | [diff] [blame] | 321 | } |
| 322 | |
Duncan Sands | e20d664 | 2005-05-26 14:32:51 +0200 | [diff] [blame] | 323 | if (!cached_vcc) |
| 324 | continue; |
| 325 | |
| 326 | vcc = cached_vcc->vcc; |
Duncan Sands | c59bba7 | 2005-05-11 20:24:03 +0200 | [diff] [blame] | 327 | |
| 328 | /* OAM F5 end-to-end */ |
| 329 | if (pti == ATM_PTI_E2EF5) { |
| 330 | atm_warn(instance, "%s: OAM not supported (vpi %d, vci %d)!\n", __func__, vpi, vci); |
| 331 | atomic_inc(&vcc->stats->rx_err); |
| 332 | continue; |
| 333 | } |
| 334 | |
Duncan Sands | e20d664 | 2005-05-26 14:32:51 +0200 | [diff] [blame] | 335 | sarb = cached_vcc->sarb; |
Duncan Sands | c59bba7 | 2005-05-11 20:24:03 +0200 | [diff] [blame] | 336 | |
| 337 | if (sarb->tail + ATM_CELL_PAYLOAD > sarb->end) { |
| 338 | atm_dbg(instance, "%s: buffer overrun (sarb->len %u, vcc: 0x%p)!\n", |
| 339 | __func__, sarb->len, vcc); |
| 340 | /* discard cells already received */ |
| 341 | skb_trim(sarb, 0); |
| 342 | UDSL_ASSERT(sarb->tail + ATM_CELL_PAYLOAD <= sarb->end); |
| 343 | } |
| 344 | |
| 345 | memcpy(sarb->tail, source + ATM_CELL_HEADER, ATM_CELL_PAYLOAD); |
| 346 | __skb_put(sarb, ATM_CELL_PAYLOAD); |
| 347 | |
| 348 | if (pti & 1) { |
| 349 | struct sk_buff *skb; |
| 350 | unsigned int length; |
| 351 | unsigned int pdu_length; |
| 352 | |
| 353 | length = (source[ATM_CELL_SIZE - 6] << 8) + source[ATM_CELL_SIZE - 5]; |
| 354 | |
| 355 | /* guard against overflow */ |
| 356 | if (length > ATM_MAX_AAL5_PDU) { |
| 357 | atm_dbg(instance, "%s: bogus length %u (vcc: 0x%p)!\n", |
| 358 | __func__, length, vcc); |
| 359 | atomic_inc(&vcc->stats->rx_err); |
| 360 | goto out; |
| 361 | } |
| 362 | |
| 363 | pdu_length = usbatm_pdu_length(length); |
| 364 | |
| 365 | if (sarb->len < pdu_length) { |
| 366 | atm_dbg(instance, "%s: bogus pdu_length %u (sarb->len: %u, vcc: 0x%p)!\n", |
| 367 | __func__, pdu_length, sarb->len, vcc); |
| 368 | atomic_inc(&vcc->stats->rx_err); |
| 369 | goto out; |
| 370 | } |
| 371 | |
| 372 | if (crc32_be(~0, sarb->tail - pdu_length, pdu_length) != 0xc704dd7b) { |
| 373 | atm_dbg(instance, "%s: packet failed crc check (vcc: 0x%p)!\n", |
| 374 | __func__, vcc); |
| 375 | atomic_inc(&vcc->stats->rx_err); |
| 376 | goto out; |
| 377 | } |
| 378 | |
| 379 | vdbg("%s: got packet (length: %u, pdu_length: %u, vcc: 0x%p)", __func__, length, pdu_length, vcc); |
| 380 | |
| 381 | if (!(skb = dev_alloc_skb(length))) { |
| 382 | atm_dbg(instance, "%s: no memory for skb (length: %u)!\n", __func__, length); |
| 383 | atomic_inc(&vcc->stats->rx_drop); |
| 384 | goto out; |
| 385 | } |
| 386 | |
| 387 | vdbg("%s: allocated new sk_buff (skb: 0x%p, skb->truesize: %u)", __func__, skb, skb->truesize); |
| 388 | |
| 389 | if (!atm_charge(vcc, skb->truesize)) { |
| 390 | atm_dbg(instance, "%s: failed atm_charge (skb->truesize: %u)!\n", __func__, skb->truesize); |
| 391 | dev_kfree_skb(skb); |
| 392 | goto out; /* atm_charge increments rx_drop */ |
| 393 | } |
| 394 | |
| 395 | memcpy(skb->data, sarb->tail - pdu_length, length); |
| 396 | __skb_put(skb, length); |
| 397 | |
| 398 | vdbg("%s: sending skb 0x%p, skb->len %u, skb->truesize %u", |
| 399 | __func__, skb, skb->len, skb->truesize); |
| 400 | |
| 401 | PACKETDEBUG(skb->data, skb->len); |
| 402 | |
| 403 | vcc->push(vcc, skb); |
| 404 | |
| 405 | atomic_inc(&vcc->stats->rx); |
| 406 | out: |
| 407 | skb_trim(sarb, 0); |
| 408 | } |
| 409 | } |
| 410 | } |
| 411 | |
| 412 | |
| 413 | /************* |
| 414 | ** encode ** |
| 415 | *************/ |
| 416 | |
| 417 | static unsigned int usbatm_write_cells(struct usbatm_data *instance, |
| 418 | struct sk_buff *skb, |
| 419 | u8 *target, unsigned int avail_space) |
| 420 | { |
| 421 | struct usbatm_control *ctrl = UDSL_SKB(skb); |
| 422 | struct atm_vcc *vcc = ctrl->atm.vcc; |
| 423 | unsigned int num_written; |
| 424 | unsigned int stride = instance->tx_channel.stride; |
| 425 | |
| 426 | vdbg("%s: skb->len=%d, avail_space=%u", __func__, skb->len, avail_space); |
| 427 | UDSL_ASSERT(!(avail_space % stride)); |
| 428 | |
| 429 | for (num_written = 0; num_written < avail_space && ctrl->len; |
| 430 | num_written += stride, target += stride) { |
| 431 | unsigned int data_len = min_t(unsigned int, skb->len, ATM_CELL_PAYLOAD); |
| 432 | unsigned int left = ATM_CELL_PAYLOAD - data_len; |
| 433 | u8 *ptr = target; |
| 434 | |
| 435 | ptr[0] = vcc->vpi >> 4; |
| 436 | ptr[1] = (vcc->vpi << 4) | (vcc->vci >> 12); |
| 437 | ptr[2] = vcc->vci >> 4; |
| 438 | ptr[3] = vcc->vci << 4; |
| 439 | ptr[4] = 0xec; |
| 440 | ptr += ATM_CELL_HEADER; |
| 441 | |
| 442 | memcpy(ptr, skb->data, data_len); |
| 443 | ptr += data_len; |
| 444 | __skb_pull(skb, data_len); |
| 445 | |
| 446 | if(!left) |
| 447 | continue; |
| 448 | |
| 449 | memset(ptr, 0, left); |
| 450 | |
| 451 | if (left >= ATM_AAL5_TRAILER) { /* trailer will go in this cell */ |
| 452 | u8 *trailer = target + ATM_CELL_SIZE - ATM_AAL5_TRAILER; |
| 453 | /* trailer[0] = 0; UU = 0 */ |
| 454 | /* trailer[1] = 0; CPI = 0 */ |
| 455 | trailer[2] = ctrl->len >> 8; |
| 456 | trailer[3] = ctrl->len; |
| 457 | |
| 458 | ctrl->crc = ~ crc32_be(ctrl->crc, ptr, left - 4); |
| 459 | |
| 460 | trailer[4] = ctrl->crc >> 24; |
| 461 | trailer[5] = ctrl->crc >> 16; |
| 462 | trailer[6] = ctrl->crc >> 8; |
| 463 | trailer[7] = ctrl->crc; |
| 464 | |
| 465 | target[3] |= 0x2; /* adjust PTI */ |
| 466 | |
| 467 | ctrl->len = 0; /* tag this skb finished */ |
| 468 | } |
| 469 | else |
| 470 | ctrl->crc = crc32_be(ctrl->crc, ptr, left); |
| 471 | } |
| 472 | |
| 473 | return num_written; |
| 474 | } |
| 475 | |
| 476 | |
| 477 | /************** |
| 478 | ** receive ** |
| 479 | **************/ |
| 480 | |
| 481 | static void usbatm_rx_process(unsigned long data) |
| 482 | { |
| 483 | struct usbatm_data *instance = (struct usbatm_data *)data; |
| 484 | struct urb *urb; |
| 485 | |
| 486 | while ((urb = usbatm_pop_urb(&instance->rx_channel))) { |
| 487 | vdbg("%s: processing urb 0x%p", __func__, urb); |
| 488 | |
| 489 | if (usb_pipeisoc(urb->pipe)) { |
| 490 | int i; |
| 491 | for (i = 0; i < urb->number_of_packets; i++) |
| 492 | if (!urb->iso_frame_desc[i].status) |
| 493 | usbatm_extract_cells(instance, |
| 494 | (u8 *)urb->transfer_buffer + urb->iso_frame_desc[i].offset, |
| 495 | urb->iso_frame_desc[i].actual_length); |
| 496 | } |
| 497 | else |
| 498 | if (!urb->status) |
| 499 | usbatm_extract_cells(instance, urb->transfer_buffer, urb->actual_length); |
| 500 | |
| 501 | if (usbatm_submit_urb(urb)) |
| 502 | return; |
| 503 | } |
| 504 | } |
| 505 | |
| 506 | |
| 507 | /*********** |
| 508 | ** send ** |
| 509 | ***********/ |
| 510 | |
| 511 | static void usbatm_tx_process(unsigned long data) |
| 512 | { |
| 513 | struct usbatm_data *instance = (struct usbatm_data *)data; |
| 514 | struct sk_buff *skb = instance->current_skb; |
| 515 | struct urb *urb = NULL; |
| 516 | const unsigned int buf_size = instance->tx_channel.buf_size; |
| 517 | unsigned int num_written = 0; |
| 518 | u8 *buffer = NULL; |
| 519 | |
| 520 | if (!skb) |
| 521 | skb = skb_dequeue(&instance->sndqueue); |
| 522 | |
| 523 | while (skb) { |
| 524 | if (!urb) { |
| 525 | urb = usbatm_pop_urb(&instance->tx_channel); |
| 526 | if (!urb) |
| 527 | break; /* no more senders */ |
| 528 | buffer = urb->transfer_buffer; |
| 529 | num_written = (urb->status == -EAGAIN) ? |
| 530 | urb->transfer_buffer_length : 0; |
| 531 | } |
| 532 | |
| 533 | num_written += usbatm_write_cells(instance, skb, |
| 534 | buffer + num_written, |
| 535 | buf_size - num_written); |
| 536 | |
| 537 | vdbg("%s: wrote %u bytes from skb 0x%p to urb 0x%p", |
| 538 | __func__, num_written, skb, urb); |
| 539 | |
| 540 | if (!UDSL_SKB(skb)->len) { |
| 541 | struct atm_vcc *vcc = UDSL_SKB(skb)->atm.vcc; |
| 542 | |
| 543 | usbatm_pop(vcc, skb); |
| 544 | atomic_inc(&vcc->stats->tx); |
| 545 | |
| 546 | skb = skb_dequeue(&instance->sndqueue); |
| 547 | } |
| 548 | |
| 549 | if (num_written == buf_size || (!skb && num_written)) { |
| 550 | urb->transfer_buffer_length = num_written; |
| 551 | |
| 552 | if (usbatm_submit_urb(urb)) |
| 553 | break; |
| 554 | urb = NULL; |
| 555 | } |
| 556 | } |
| 557 | |
| 558 | instance->current_skb = skb; |
| 559 | } |
| 560 | |
| 561 | static void usbatm_cancel_send(struct usbatm_data *instance, |
| 562 | struct atm_vcc *vcc) |
| 563 | { |
| 564 | struct sk_buff *skb, *n; |
| 565 | |
| 566 | atm_dbg(instance, "%s entered\n", __func__); |
| 567 | spin_lock_irq(&instance->sndqueue.lock); |
| 568 | for (skb = instance->sndqueue.next, n = skb->next; |
| 569 | skb != (struct sk_buff *)&instance->sndqueue; |
| 570 | skb = n, n = skb->next) |
| 571 | if (UDSL_SKB(skb)->atm.vcc == vcc) { |
| 572 | atm_dbg(instance, "%s: popping skb 0x%p\n", __func__, skb); |
| 573 | __skb_unlink(skb, &instance->sndqueue); |
| 574 | usbatm_pop(vcc, skb); |
| 575 | } |
| 576 | spin_unlock_irq(&instance->sndqueue.lock); |
| 577 | |
| 578 | tasklet_disable(&instance->tx_channel.tasklet); |
| 579 | if ((skb = instance->current_skb) && (UDSL_SKB(skb)->atm.vcc == vcc)) { |
| 580 | atm_dbg(instance, "%s: popping current skb (0x%p)\n", __func__, skb); |
| 581 | instance->current_skb = NULL; |
| 582 | usbatm_pop(vcc, skb); |
| 583 | } |
| 584 | tasklet_enable(&instance->tx_channel.tasklet); |
| 585 | atm_dbg(instance, "%s done\n", __func__); |
| 586 | } |
| 587 | |
| 588 | static int usbatm_atm_send(struct atm_vcc *vcc, struct sk_buff *skb) |
| 589 | { |
| 590 | struct usbatm_data *instance = vcc->dev->dev_data; |
| 591 | struct usbatm_control *ctrl = UDSL_SKB(skb); |
| 592 | int err; |
| 593 | |
| 594 | vdbg("%s called (skb 0x%p, len %u)", __func__, skb, skb->len); |
| 595 | |
| 596 | if (!instance) { |
| 597 | dbg("%s: NULL data!", __func__); |
| 598 | err = -ENODEV; |
| 599 | goto fail; |
| 600 | } |
| 601 | |
| 602 | if (vcc->qos.aal != ATM_AAL5) { |
| 603 | atm_dbg(instance, "%s: unsupported ATM type %d!\n", __func__, vcc->qos.aal); |
| 604 | err = -EINVAL; |
| 605 | goto fail; |
| 606 | } |
| 607 | |
| 608 | if (skb->len > ATM_MAX_AAL5_PDU) { |
| 609 | atm_dbg(instance, "%s: packet too long (%d vs %d)!\n", |
| 610 | __func__, skb->len, ATM_MAX_AAL5_PDU); |
| 611 | err = -EINVAL; |
| 612 | goto fail; |
| 613 | } |
| 614 | |
| 615 | PACKETDEBUG(skb->data, skb->len); |
| 616 | |
| 617 | /* initialize the control block */ |
| 618 | ctrl->atm.vcc = vcc; |
| 619 | ctrl->len = skb->len; |
| 620 | ctrl->crc = crc32_be(~0, skb->data, skb->len); |
| 621 | |
| 622 | skb_queue_tail(&instance->sndqueue, skb); |
| 623 | tasklet_schedule(&instance->tx_channel.tasklet); |
| 624 | |
| 625 | return 0; |
| 626 | |
| 627 | fail: |
| 628 | usbatm_pop(vcc, skb); |
| 629 | return err; |
| 630 | } |
| 631 | |
| 632 | |
| 633 | /******************** |
| 634 | ** bean counting ** |
| 635 | ********************/ |
| 636 | |
| 637 | static void usbatm_destroy_instance(struct kref *kref) |
| 638 | { |
| 639 | struct usbatm_data *instance = container_of(kref, struct usbatm_data, refcount); |
| 640 | |
| 641 | dbg("%s", __func__); |
| 642 | |
| 643 | tasklet_kill(&instance->rx_channel.tasklet); |
| 644 | tasklet_kill(&instance->tx_channel.tasklet); |
| 645 | usb_put_dev(instance->usb_dev); |
| 646 | kfree(instance); |
| 647 | } |
| 648 | |
Adrian Bunk | 3d48586 | 2005-11-20 23:56:11 +0100 | [diff] [blame] | 649 | static void usbatm_get_instance(struct usbatm_data *instance) |
Duncan Sands | c59bba7 | 2005-05-11 20:24:03 +0200 | [diff] [blame] | 650 | { |
| 651 | dbg("%s", __func__); |
| 652 | |
| 653 | kref_get(&instance->refcount); |
| 654 | } |
| 655 | |
Adrian Bunk | 3d48586 | 2005-11-20 23:56:11 +0100 | [diff] [blame] | 656 | static void usbatm_put_instance(struct usbatm_data *instance) |
Duncan Sands | c59bba7 | 2005-05-11 20:24:03 +0200 | [diff] [blame] | 657 | { |
| 658 | dbg("%s", __func__); |
| 659 | |
| 660 | kref_put(&instance->refcount, usbatm_destroy_instance); |
| 661 | } |
| 662 | |
| 663 | |
| 664 | /********** |
| 665 | ** ATM ** |
| 666 | **********/ |
| 667 | |
| 668 | static void usbatm_atm_dev_close(struct atm_dev *dev) |
| 669 | { |
| 670 | struct usbatm_data *instance = dev->dev_data; |
| 671 | |
| 672 | dbg("%s", __func__); |
| 673 | |
| 674 | if (!instance) |
| 675 | return; |
| 676 | |
| 677 | dev->dev_data = NULL; |
| 678 | usbatm_put_instance(instance); /* taken in usbatm_atm_init */ |
| 679 | } |
| 680 | |
| 681 | static int usbatm_atm_proc_read(struct atm_dev *atm_dev, loff_t * pos, char *page) |
| 682 | { |
| 683 | struct usbatm_data *instance = atm_dev->dev_data; |
| 684 | int left = *pos; |
| 685 | |
| 686 | if (!instance) { |
| 687 | dbg("%s: NULL instance!", __func__); |
| 688 | return -ENODEV; |
| 689 | } |
| 690 | |
| 691 | if (!left--) |
| 692 | return sprintf(page, "%s\n", instance->description); |
| 693 | |
| 694 | if (!left--) |
| 695 | return sprintf(page, "MAC: %02x:%02x:%02x:%02x:%02x:%02x\n", |
| 696 | atm_dev->esi[0], atm_dev->esi[1], |
| 697 | atm_dev->esi[2], atm_dev->esi[3], |
| 698 | atm_dev->esi[4], atm_dev->esi[5]); |
| 699 | |
| 700 | if (!left--) |
| 701 | return sprintf(page, |
| 702 | "AAL5: tx %d ( %d err ), rx %d ( %d err, %d drop )\n", |
| 703 | atomic_read(&atm_dev->stats.aal5.tx), |
| 704 | atomic_read(&atm_dev->stats.aal5.tx_err), |
| 705 | atomic_read(&atm_dev->stats.aal5.rx), |
| 706 | atomic_read(&atm_dev->stats.aal5.rx_err), |
| 707 | atomic_read(&atm_dev->stats.aal5.rx_drop)); |
| 708 | |
| 709 | if (!left--) |
| 710 | switch (atm_dev->signal) { |
| 711 | case ATM_PHY_SIG_FOUND: |
| 712 | return sprintf(page, "Line up\n"); |
| 713 | case ATM_PHY_SIG_LOST: |
| 714 | return sprintf(page, "Line down\n"); |
| 715 | default: |
| 716 | return sprintf(page, "Line state unknown\n"); |
| 717 | } |
| 718 | |
| 719 | return 0; |
| 720 | } |
| 721 | |
| 722 | static int usbatm_atm_open(struct atm_vcc *vcc) |
| 723 | { |
| 724 | struct usbatm_data *instance = vcc->dev->dev_data; |
| 725 | struct usbatm_vcc_data *new = NULL; |
| 726 | int ret; |
| 727 | int vci = vcc->vci; |
| 728 | short vpi = vcc->vpi; |
| 729 | |
| 730 | if (!instance) { |
| 731 | dbg("%s: NULL data!", __func__); |
| 732 | return -ENODEV; |
| 733 | } |
| 734 | |
| 735 | atm_dbg(instance, "%s: vpi %hd, vci %d\n", __func__, vpi, vci); |
| 736 | |
| 737 | /* only support AAL5 */ |
| 738 | if ((vcc->qos.aal != ATM_AAL5) || (vcc->qos.rxtp.max_sdu < 0) |
| 739 | || (vcc->qos.rxtp.max_sdu > ATM_MAX_AAL5_PDU)) { |
| 740 | atm_dbg(instance, "%s: unsupported ATM type %d!\n", __func__, vcc->qos.aal); |
| 741 | return -EINVAL; |
| 742 | } |
| 743 | |
| 744 | down(&instance->serialize); /* vs self, usbatm_atm_close */ |
| 745 | |
| 746 | if (usbatm_find_vcc(instance, vpi, vci)) { |
| 747 | atm_dbg(instance, "%s: %hd/%d already in use!\n", __func__, vpi, vci); |
| 748 | ret = -EADDRINUSE; |
| 749 | goto fail; |
| 750 | } |
| 751 | |
| 752 | if (!(new = kmalloc(sizeof(struct usbatm_vcc_data), GFP_KERNEL))) { |
| 753 | atm_dbg(instance, "%s: no memory for vcc_data!\n", __func__); |
| 754 | ret = -ENOMEM; |
| 755 | goto fail; |
| 756 | } |
| 757 | |
| 758 | memset(new, 0, sizeof(struct usbatm_vcc_data)); |
| 759 | new->vcc = vcc; |
| 760 | new->vpi = vpi; |
| 761 | new->vci = vci; |
| 762 | |
| 763 | new->sarb = alloc_skb(usbatm_pdu_length(vcc->qos.rxtp.max_sdu), GFP_KERNEL); |
| 764 | if (!new->sarb) { |
| 765 | atm_dbg(instance, "%s: no memory for SAR buffer!\n", __func__); |
| 766 | ret = -ENOMEM; |
| 767 | goto fail; |
| 768 | } |
| 769 | |
| 770 | vcc->dev_data = new; |
| 771 | |
| 772 | tasklet_disable(&instance->rx_channel.tasklet); |
| 773 | list_add(&new->list, &instance->vcc_list); |
| 774 | tasklet_enable(&instance->rx_channel.tasklet); |
| 775 | |
| 776 | set_bit(ATM_VF_ADDR, &vcc->flags); |
| 777 | set_bit(ATM_VF_PARTIAL, &vcc->flags); |
| 778 | set_bit(ATM_VF_READY, &vcc->flags); |
| 779 | |
| 780 | up(&instance->serialize); |
| 781 | |
| 782 | atm_dbg(instance, "%s: allocated vcc data 0x%p\n", __func__, new); |
| 783 | |
| 784 | return 0; |
| 785 | |
| 786 | fail: |
| 787 | kfree(new); |
| 788 | up(&instance->serialize); |
| 789 | return ret; |
| 790 | } |
| 791 | |
| 792 | static void usbatm_atm_close(struct atm_vcc *vcc) |
| 793 | { |
| 794 | struct usbatm_data *instance = vcc->dev->dev_data; |
| 795 | struct usbatm_vcc_data *vcc_data = vcc->dev_data; |
| 796 | |
| 797 | if (!instance || !vcc_data) { |
| 798 | dbg("%s: NULL data!", __func__); |
| 799 | return; |
| 800 | } |
| 801 | |
| 802 | atm_dbg(instance, "%s entered\n", __func__); |
| 803 | |
| 804 | atm_dbg(instance, "%s: deallocating vcc 0x%p with vpi %d vci %d\n", |
| 805 | __func__, vcc_data, vcc_data->vpi, vcc_data->vci); |
| 806 | |
| 807 | usbatm_cancel_send(instance, vcc); |
| 808 | |
| 809 | down(&instance->serialize); /* vs self, usbatm_atm_open */ |
| 810 | |
| 811 | tasklet_disable(&instance->rx_channel.tasklet); |
| 812 | list_del(&vcc_data->list); |
| 813 | tasklet_enable(&instance->rx_channel.tasklet); |
| 814 | |
| 815 | kfree_skb(vcc_data->sarb); |
| 816 | vcc_data->sarb = NULL; |
| 817 | |
| 818 | kfree(vcc_data); |
| 819 | vcc->dev_data = NULL; |
| 820 | |
| 821 | vcc->vpi = ATM_VPI_UNSPEC; |
| 822 | vcc->vci = ATM_VCI_UNSPEC; |
| 823 | clear_bit(ATM_VF_READY, &vcc->flags); |
| 824 | clear_bit(ATM_VF_PARTIAL, &vcc->flags); |
| 825 | clear_bit(ATM_VF_ADDR, &vcc->flags); |
| 826 | |
| 827 | up(&instance->serialize); |
| 828 | |
| 829 | atm_dbg(instance, "%s successful\n", __func__); |
| 830 | } |
| 831 | |
| 832 | static int usbatm_atm_ioctl(struct atm_dev *dev, unsigned int cmd, |
| 833 | void __user * arg) |
| 834 | { |
| 835 | switch (cmd) { |
| 836 | case ATM_QUERYLOOP: |
| 837 | return put_user(ATM_LM_NONE, (int __user *)arg) ? -EFAULT : 0; |
| 838 | default: |
| 839 | return -ENOIOCTLCMD; |
| 840 | } |
| 841 | } |
| 842 | |
| 843 | static int usbatm_atm_init(struct usbatm_data *instance) |
| 844 | { |
| 845 | struct atm_dev *atm_dev; |
| 846 | int ret, i; |
| 847 | |
| 848 | /* ATM init */ |
| 849 | atm_dev = atm_dev_register(instance->driver_name, &usbatm_atm_devops, -1, NULL); |
| 850 | if (!atm_dev) { |
| 851 | usb_dbg(instance, "%s: failed to register ATM device!\n", __func__); |
| 852 | return -1; |
| 853 | } |
| 854 | |
| 855 | instance->atm_dev = atm_dev; |
| 856 | |
| 857 | atm_dev->ci_range.vpi_bits = ATM_CI_MAX; |
| 858 | atm_dev->ci_range.vci_bits = ATM_CI_MAX; |
| 859 | atm_dev->signal = ATM_PHY_SIG_UNKNOWN; |
| 860 | |
| 861 | /* temp init ATM device, set to 128kbit */ |
| 862 | atm_dev->link_rate = 128 * 1000 / 424; |
| 863 | |
| 864 | if (instance->driver->atm_start && ((ret = instance->driver->atm_start(instance, atm_dev)) < 0)) { |
| 865 | atm_dbg(instance, "%s: atm_start failed: %d!\n", __func__, ret); |
| 866 | goto fail; |
| 867 | } |
| 868 | |
| 869 | /* ready for ATM callbacks */ |
| 870 | usbatm_get_instance(instance); /* dropped in usbatm_atm_dev_close */ |
| 871 | mb(); |
| 872 | atm_dev->dev_data = instance; |
| 873 | |
| 874 | /* submit all rx URBs */ |
| 875 | for (i = 0; i < num_rcv_urbs; i++) |
| 876 | usbatm_submit_urb(instance->urbs[i]); |
| 877 | |
| 878 | return 0; |
| 879 | |
| 880 | fail: |
| 881 | instance->atm_dev = NULL; |
Stanislaw Gruszka | 64bf69d | 2005-11-29 16:16:41 -0800 | [diff] [blame] | 882 | atm_dev_deregister(atm_dev); /* usbatm_atm_dev_close will eventually be called */ |
Duncan Sands | c59bba7 | 2005-05-11 20:24:03 +0200 | [diff] [blame] | 883 | return ret; |
| 884 | } |
| 885 | |
| 886 | |
| 887 | /********** |
| 888 | ** USB ** |
| 889 | **********/ |
| 890 | |
| 891 | static int usbatm_do_heavy_init(void *arg) |
| 892 | { |
| 893 | struct usbatm_data *instance = arg; |
| 894 | int ret; |
| 895 | |
| 896 | daemonize(instance->driver->driver_name); |
| 897 | allow_signal(SIGTERM); |
| 898 | |
| 899 | complete(&instance->thread_started); |
| 900 | |
| 901 | ret = instance->driver->heavy_init(instance, instance->usb_intf); |
| 902 | |
| 903 | if (!ret) |
| 904 | ret = usbatm_atm_init(instance); |
| 905 | |
| 906 | down(&instance->serialize); |
| 907 | instance->thread_pid = -1; |
| 908 | up(&instance->serialize); |
| 909 | |
| 910 | complete_and_exit(&instance->thread_exited, ret); |
| 911 | } |
| 912 | |
| 913 | static int usbatm_heavy_init(struct usbatm_data *instance) |
| 914 | { |
| 915 | int ret = kernel_thread(usbatm_do_heavy_init, instance, CLONE_KERNEL); |
| 916 | |
| 917 | if (ret < 0) { |
| 918 | usb_dbg(instance, "%s: failed to create kernel_thread (%d)!\n", __func__, ret); |
| 919 | return ret; |
| 920 | } |
| 921 | |
| 922 | down(&instance->serialize); |
| 923 | instance->thread_pid = ret; |
| 924 | up(&instance->serialize); |
| 925 | |
| 926 | wait_for_completion(&instance->thread_started); |
| 927 | |
| 928 | return 0; |
| 929 | } |
| 930 | |
| 931 | static void usbatm_tasklet_schedule(unsigned long data) |
| 932 | { |
| 933 | tasklet_schedule((struct tasklet_struct *) data); |
| 934 | } |
| 935 | |
| 936 | static inline void usbatm_init_channel(struct usbatm_channel *channel) |
| 937 | { |
| 938 | spin_lock_init(&channel->lock); |
| 939 | INIT_LIST_HEAD(&channel->list); |
| 940 | channel->delay.function = usbatm_tasklet_schedule; |
| 941 | channel->delay.data = (unsigned long) &channel->tasklet; |
| 942 | init_timer(&channel->delay); |
| 943 | } |
| 944 | |
| 945 | int usbatm_usb_probe(struct usb_interface *intf, const struct usb_device_id *id, |
| 946 | struct usbatm_driver *driver) |
| 947 | { |
| 948 | struct device *dev = &intf->dev; |
| 949 | struct usb_device *usb_dev = interface_to_usbdev(intf); |
| 950 | struct usbatm_data *instance; |
| 951 | char *buf; |
| 952 | int error = -ENOMEM; |
| 953 | int i, length; |
| 954 | int need_heavy; |
| 955 | |
| 956 | dev_dbg(dev, "%s: trying driver %s with vendor=0x%x, product=0x%x, ifnum %d\n", |
| 957 | __func__, driver->driver_name, |
| 958 | le16_to_cpu(usb_dev->descriptor.idVendor), |
| 959 | le16_to_cpu(usb_dev->descriptor.idProduct), |
| 960 | intf->altsetting->desc.bInterfaceNumber); |
| 961 | |
| 962 | /* instance init */ |
Pekka Enberg | 7b842b6 | 2005-09-06 15:18:34 -0700 | [diff] [blame] | 963 | instance = kzalloc(sizeof(*instance) + sizeof(struct urb *) * (num_rcv_urbs + num_snd_urbs), GFP_KERNEL); |
Duncan Sands | c59bba7 | 2005-05-11 20:24:03 +0200 | [diff] [blame] | 964 | if (!instance) { |
| 965 | dev_dbg(dev, "%s: no memory for instance data!\n", __func__); |
| 966 | return -ENOMEM; |
| 967 | } |
| 968 | |
Duncan Sands | c59bba7 | 2005-05-11 20:24:03 +0200 | [diff] [blame] | 969 | /* public fields */ |
| 970 | |
| 971 | instance->driver = driver; |
| 972 | snprintf(instance->driver_name, sizeof(instance->driver_name), driver->driver_name); |
| 973 | |
| 974 | instance->usb_dev = usb_dev; |
| 975 | instance->usb_intf = intf; |
| 976 | |
| 977 | buf = instance->description; |
| 978 | length = sizeof(instance->description); |
| 979 | |
| 980 | if ((i = usb_string(usb_dev, usb_dev->descriptor.iProduct, buf, length)) < 0) |
| 981 | goto bind; |
| 982 | |
| 983 | buf += i; |
| 984 | length -= i; |
| 985 | |
| 986 | i = scnprintf(buf, length, " ("); |
| 987 | buf += i; |
| 988 | length -= i; |
| 989 | |
| 990 | if (length <= 0 || (i = usb_make_path(usb_dev, buf, length)) < 0) |
| 991 | goto bind; |
| 992 | |
| 993 | buf += i; |
| 994 | length -= i; |
| 995 | |
| 996 | snprintf(buf, length, ")"); |
| 997 | |
| 998 | bind: |
| 999 | need_heavy = 1; |
| 1000 | if (driver->bind && (error = driver->bind(instance, intf, id, &need_heavy)) < 0) { |
| 1001 | dev_dbg(dev, "%s: bind failed: %d!\n", __func__, error); |
| 1002 | goto fail_free; |
| 1003 | } |
| 1004 | |
| 1005 | /* private fields */ |
| 1006 | |
| 1007 | kref_init(&instance->refcount); /* dropped in usbatm_usb_disconnect */ |
| 1008 | init_MUTEX(&instance->serialize); |
| 1009 | |
| 1010 | instance->thread_pid = -1; |
| 1011 | init_completion(&instance->thread_started); |
| 1012 | init_completion(&instance->thread_exited); |
| 1013 | |
| 1014 | INIT_LIST_HEAD(&instance->vcc_list); |
| 1015 | |
| 1016 | usbatm_init_channel(&instance->rx_channel); |
| 1017 | usbatm_init_channel(&instance->tx_channel); |
| 1018 | tasklet_init(&instance->rx_channel.tasklet, usbatm_rx_process, (unsigned long)instance); |
| 1019 | tasklet_init(&instance->tx_channel.tasklet, usbatm_tx_process, (unsigned long)instance); |
| 1020 | instance->rx_channel.endpoint = usb_rcvbulkpipe(usb_dev, driver->in); |
| 1021 | instance->tx_channel.endpoint = usb_sndbulkpipe(usb_dev, driver->out); |
| 1022 | instance->rx_channel.stride = ATM_CELL_SIZE + driver->rx_padding; |
| 1023 | instance->tx_channel.stride = ATM_CELL_SIZE + driver->tx_padding; |
| 1024 | instance->rx_channel.buf_size = rcv_buf_size * instance->rx_channel.stride; |
| 1025 | instance->tx_channel.buf_size = snd_buf_size * instance->tx_channel.stride; |
| 1026 | instance->rx_channel.usbatm = instance->tx_channel.usbatm = instance; |
| 1027 | |
| 1028 | skb_queue_head_init(&instance->sndqueue); |
| 1029 | |
| 1030 | for (i = 0; i < num_rcv_urbs + num_snd_urbs; i++) { |
| 1031 | struct urb *urb; |
| 1032 | u8 *buffer; |
| 1033 | unsigned int iso_packets = 0, iso_size = 0; |
| 1034 | struct usbatm_channel *channel = i < num_rcv_urbs ? |
| 1035 | &instance->rx_channel : &instance->tx_channel; |
| 1036 | |
| 1037 | if (usb_pipeisoc(channel->endpoint)) { |
| 1038 | /* don't expect iso out endpoints */ |
| 1039 | iso_size = usb_maxpacket(instance->usb_dev, channel->endpoint, 0); |
| 1040 | iso_size -= iso_size % channel->stride; /* alignment */ |
| 1041 | BUG_ON(!iso_size); |
| 1042 | iso_packets = (channel->buf_size - 1) / iso_size + 1; |
| 1043 | } |
| 1044 | |
| 1045 | urb = usb_alloc_urb(iso_packets, GFP_KERNEL); |
| 1046 | if (!urb) { |
| 1047 | dev_dbg(dev, "%s: no memory for urb %d!\n", __func__, i); |
| 1048 | goto fail_unbind; |
| 1049 | } |
| 1050 | |
Duncan Sands | 65412e4 | 2005-05-27 10:00:08 +0200 | [diff] [blame] | 1051 | instance->urbs[i] = urb; |
| 1052 | |
Duncan Sands | c59bba7 | 2005-05-11 20:24:03 +0200 | [diff] [blame] | 1053 | buffer = kmalloc(channel->buf_size, GFP_KERNEL); |
| 1054 | if (!buffer) { |
| 1055 | dev_dbg(dev, "%s: no memory for buffer %d!\n", __func__, i); |
| 1056 | goto fail_unbind; |
| 1057 | } |
| 1058 | memset(buffer, 0, channel->buf_size); |
| 1059 | |
| 1060 | usb_fill_bulk_urb(urb, instance->usb_dev, channel->endpoint, |
| 1061 | buffer, channel->buf_size, usbatm_complete, channel); |
| 1062 | if (iso_packets) { |
| 1063 | int j; |
| 1064 | urb->interval = 1; |
| 1065 | urb->transfer_flags = URB_ISO_ASAP; |
| 1066 | urb->number_of_packets = iso_packets; |
| 1067 | for (j = 0; j < iso_packets; j++) { |
| 1068 | urb->iso_frame_desc[j].offset = iso_size * j; |
| 1069 | urb->iso_frame_desc[j].length = min_t(int, iso_size, |
| 1070 | channel->buf_size - urb->iso_frame_desc[j].offset); |
| 1071 | } |
| 1072 | } |
| 1073 | |
| 1074 | /* put all tx URBs on the list of spares */ |
| 1075 | if (i >= num_rcv_urbs) |
| 1076 | list_add_tail(&urb->urb_list, &channel->list); |
| 1077 | |
| 1078 | vdbg("%s: alloced buffer 0x%p buf size %u urb 0x%p", |
| 1079 | __func__, urb->transfer_buffer, urb->transfer_buffer_length, urb); |
Duncan Sands | c59bba7 | 2005-05-11 20:24:03 +0200 | [diff] [blame] | 1080 | } |
| 1081 | |
| 1082 | if (need_heavy && driver->heavy_init) { |
| 1083 | error = usbatm_heavy_init(instance); |
| 1084 | } else { |
| 1085 | complete(&instance->thread_exited); /* pretend that heavy_init was run */ |
| 1086 | error = usbatm_atm_init(instance); |
| 1087 | } |
| 1088 | |
| 1089 | if (error < 0) |
| 1090 | goto fail_unbind; |
| 1091 | |
| 1092 | usb_get_dev(usb_dev); |
| 1093 | usb_set_intfdata(intf, instance); |
| 1094 | |
| 1095 | return 0; |
| 1096 | |
| 1097 | fail_unbind: |
| 1098 | if (instance->driver->unbind) |
| 1099 | instance->driver->unbind(instance, intf); |
| 1100 | fail_free: |
| 1101 | for (i = 0; i < num_rcv_urbs + num_snd_urbs; i++) { |
| 1102 | if (instance->urbs[i]) |
| 1103 | kfree(instance->urbs[i]->transfer_buffer); |
| 1104 | usb_free_urb(instance->urbs[i]); |
| 1105 | } |
| 1106 | |
| 1107 | kfree (instance); |
| 1108 | |
| 1109 | return error; |
| 1110 | } |
| 1111 | EXPORT_SYMBOL_GPL(usbatm_usb_probe); |
| 1112 | |
| 1113 | void usbatm_usb_disconnect(struct usb_interface *intf) |
| 1114 | { |
| 1115 | struct device *dev = &intf->dev; |
| 1116 | struct usbatm_data *instance = usb_get_intfdata(intf); |
| 1117 | int i; |
| 1118 | |
| 1119 | dev_dbg(dev, "%s entered\n", __func__); |
| 1120 | |
| 1121 | if (!instance) { |
| 1122 | dev_dbg(dev, "%s: NULL instance!\n", __func__); |
| 1123 | return; |
| 1124 | } |
| 1125 | |
| 1126 | usb_set_intfdata(intf, NULL); |
| 1127 | |
| 1128 | down(&instance->serialize); |
| 1129 | if (instance->thread_pid >= 0) |
| 1130 | kill_proc(instance->thread_pid, SIGTERM, 1); |
| 1131 | up(&instance->serialize); |
| 1132 | |
| 1133 | wait_for_completion(&instance->thread_exited); |
| 1134 | |
| 1135 | tasklet_disable(&instance->rx_channel.tasklet); |
| 1136 | tasklet_disable(&instance->tx_channel.tasklet); |
| 1137 | |
| 1138 | for (i = 0; i < num_rcv_urbs + num_snd_urbs; i++) |
| 1139 | usb_kill_urb(instance->urbs[i]); |
| 1140 | |
| 1141 | del_timer_sync(&instance->rx_channel.delay); |
| 1142 | del_timer_sync(&instance->tx_channel.delay); |
| 1143 | |
| 1144 | if (instance->atm_dev && instance->driver->atm_stop) |
| 1145 | instance->driver->atm_stop(instance, instance->atm_dev); |
| 1146 | |
| 1147 | if (instance->driver->unbind) |
| 1148 | instance->driver->unbind(instance, intf); |
| 1149 | |
| 1150 | instance->driver_data = NULL; |
| 1151 | |
| 1152 | /* turn usbatm_[rt]x_process into noop */ |
| 1153 | /* no need to take the spinlock */ |
| 1154 | INIT_LIST_HEAD(&instance->rx_channel.list); |
| 1155 | INIT_LIST_HEAD(&instance->tx_channel.list); |
| 1156 | |
| 1157 | tasklet_enable(&instance->rx_channel.tasklet); |
| 1158 | tasklet_enable(&instance->tx_channel.tasklet); |
| 1159 | |
| 1160 | for (i = 0; i < num_rcv_urbs + num_snd_urbs; i++) { |
| 1161 | kfree(instance->urbs[i]->transfer_buffer); |
| 1162 | usb_free_urb(instance->urbs[i]); |
| 1163 | } |
| 1164 | |
| 1165 | /* ATM finalize */ |
| 1166 | if (instance->atm_dev) |
Stanislaw Gruszka | 64bf69d | 2005-11-29 16:16:41 -0800 | [diff] [blame] | 1167 | atm_dev_deregister(instance->atm_dev); |
Duncan Sands | c59bba7 | 2005-05-11 20:24:03 +0200 | [diff] [blame] | 1168 | |
| 1169 | usbatm_put_instance(instance); /* taken in usbatm_usb_probe */ |
| 1170 | } |
| 1171 | EXPORT_SYMBOL_GPL(usbatm_usb_disconnect); |
| 1172 | |
| 1173 | |
| 1174 | /*********** |
| 1175 | ** init ** |
| 1176 | ***********/ |
| 1177 | |
| 1178 | static int __init usbatm_usb_init(void) |
| 1179 | { |
| 1180 | dbg("%s: driver version %s", __func__, DRIVER_VERSION); |
| 1181 | |
| 1182 | if (sizeof(struct usbatm_control) > sizeof(((struct sk_buff *) 0)->cb)) { |
| 1183 | printk(KERN_ERR "%s unusable with this kernel!\n", usbatm_driver_name); |
| 1184 | return -EIO; |
| 1185 | } |
| 1186 | |
| 1187 | if ((num_rcv_urbs > UDSL_MAX_RCV_URBS) |
| 1188 | || (num_snd_urbs > UDSL_MAX_SND_URBS) |
| 1189 | || (rcv_buf_size < 1) |
| 1190 | || (rcv_buf_size > UDSL_MAX_RCV_BUF_SIZE) |
| 1191 | || (snd_buf_size < 1) |
| 1192 | || (snd_buf_size > UDSL_MAX_SND_BUF_SIZE)) |
| 1193 | return -EINVAL; |
| 1194 | |
| 1195 | return 0; |
| 1196 | } |
| 1197 | module_init(usbatm_usb_init); |
| 1198 | |
| 1199 | static void __exit usbatm_usb_exit(void) |
| 1200 | { |
| 1201 | dbg("%s", __func__); |
| 1202 | } |
| 1203 | module_exit(usbatm_usb_exit); |
| 1204 | |
| 1205 | MODULE_AUTHOR(DRIVER_AUTHOR); |
| 1206 | MODULE_DESCRIPTION(DRIVER_DESC); |
| 1207 | MODULE_LICENSE("GPL"); |
| 1208 | MODULE_VERSION(DRIVER_VERSION); |
| 1209 | |
| 1210 | /************ |
| 1211 | ** debug ** |
| 1212 | ************/ |
| 1213 | |
| 1214 | #ifdef VERBOSE_DEBUG |
| 1215 | static int usbatm_print_packet(const unsigned char *data, int len) |
| 1216 | { |
| 1217 | unsigned char buffer[256]; |
| 1218 | int i = 0, j = 0; |
| 1219 | |
| 1220 | for (i = 0; i < len;) { |
| 1221 | buffer[0] = '\0'; |
| 1222 | sprintf(buffer, "%.3d :", i); |
| 1223 | for (j = 0; (j < 16) && (i < len); j++, i++) { |
| 1224 | sprintf(buffer, "%s %2.2x", buffer, data[i]); |
| 1225 | } |
| 1226 | dbg("%s", buffer); |
| 1227 | } |
| 1228 | return i; |
| 1229 | } |
| 1230 | #endif |