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[PATCH] zd1211rw: Add ID for Linksys WUSBF54G
[linux-2.6-block.git] / drivers / net / wireless / zd1211rw / zd_usb.c
CommitLineData
e85d0918
DD		 1/* zd_usb.c
2 *
3 * This program is free software; you can redistribute it and/or modify
4 * it under the terms of the GNU General Public License as published by
5 * the Free Software Foundation; either version 2 of the License, or
6 * (at your option) any later version.
7 *
8 * This program is distributed in the hope that it will be useful,
9 * but WITHOUT ANY WARRANTY; without even the implied warranty of
10 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
11 * GNU General Public License for more details.
12 *
13 * You should have received a copy of the GNU General Public License
14 * along with this program; if not, write to the Free Software
15 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
16 */
17
18#include <asm/unaligned.h>
d066c219 19#include <linux/kernel.h>
e85d0918
DD		 20#include <linux/init.h>
21#include <linux/module.h>
22#include <linux/firmware.h>
23#include <linux/device.h>
24#include <linux/errno.h>
25#include <linux/skbuff.h>
26#include <linux/usb.h>
bc5f06a8 27#include <linux/workqueue.h>
e85d0918
DD		 28#include <net/ieee80211.h>
29
30#include "zd_def.h"
31#include "zd_netdev.h"
32#include "zd_mac.h"
33#include "zd_usb.h"
34#include "zd_util.h"
35
36static struct usb_device_id usb_ids[] = {
37 /* ZD1211 */
38 { USB_DEVICE(0x0ace, 0x1211), .driver_info = DEVICE_ZD1211 },
39 { USB_DEVICE(0x07b8, 0x6001), .driver_info = DEVICE_ZD1211 },
40 { USB_DEVICE(0x126f, 0xa006), .driver_info = DEVICE_ZD1211 },
41 { USB_DEVICE(0x6891, 0xa727), .driver_info = DEVICE_ZD1211 },
42 { USB_DEVICE(0x0df6, 0x9071), .driver_info = DEVICE_ZD1211 },
43 { USB_DEVICE(0x157e, 0x300b), .driver_info = DEVICE_ZD1211 },
dd2f5538 44 { USB_DEVICE(0x079b, 0x004a), .driver_info = DEVICE_ZD1211 },
1b865491 45 { USB_DEVICE(0x1740, 0x2000), .driver_info = DEVICE_ZD1211 },
12f39308 46 { USB_DEVICE(0x157e, 0x3204), .driver_info = DEVICE_ZD1211 },
4ceb7e99 47 { USB_DEVICE(0x0586, 0x3402), .driver_info = DEVICE_ZD1211 },
fca2714f 48 { USB_DEVICE(0x0b3b, 0x5630), .driver_info = DEVICE_ZD1211 },
fc3e39be 49 { USB_DEVICE(0x0b05, 0x170c), .driver_info = DEVICE_ZD1211 },
f2423723
DD		 50 { USB_DEVICE(0x1435, 0x0711), .driver_info = DEVICE_ZD1211 },
51 { USB_DEVICE(0x0586, 0x3409), .driver_info = DEVICE_ZD1211 },
52 { USB_DEVICE(0x0b3b, 0x1630), .driver_info = DEVICE_ZD1211 },
a362bf57 53 { USB_DEVICE(0x0586, 0x3401), .driver_info = DEVICE_ZD1211 },
229782a3 54 { USB_DEVICE(0x14ea, 0xab13), .driver_info = DEVICE_ZD1211 },
e85d0918
DD		 55 /* ZD1211B */
56 { USB_DEVICE(0x0ace, 0x1215), .driver_info = DEVICE_ZD1211B },
57 { USB_DEVICE(0x157e, 0x300d), .driver_info = DEVICE_ZD1211B },
dd2f5538 58 { USB_DEVICE(0x079b, 0x0062), .driver_info = DEVICE_ZD1211B },
943599ee 59 { USB_DEVICE(0x1582, 0x6003), .driver_info = DEVICE_ZD1211B },
8e87295b 60 { USB_DEVICE(0x050d, 0x705c), .driver_info = DEVICE_ZD1211B },
a2bdcc67
DD		 61 { USB_DEVICE(0x083a, 0x4505), .driver_info = DEVICE_ZD1211B },
62 { USB_DEVICE(0x0471, 0x1236), .driver_info = DEVICE_ZD1211B },
33218ba1 63 { USB_DEVICE(0x13b1, 0x0024), .driver_info = DEVICE_ZD1211B },
a1030e92
DD		 64 /* "Driverless" devices that need ejecting */
65 { USB_DEVICE(0x0ace, 0x2011), .driver_info = DEVICE_INSTALLER },
e85d0918
DD		 66 {}
67};
68
69MODULE_LICENSE("GPL");
70MODULE_DESCRIPTION("USB driver for devices with the ZD1211 chip.");
71MODULE_AUTHOR("Ulrich Kunitz");
72MODULE_AUTHOR("Daniel Drake");
73MODULE_VERSION("1.0");
74MODULE_DEVICE_TABLE(usb, usb_ids);
75
76#define FW_ZD1211_PREFIX "zd1211/zd1211_"
77#define FW_ZD1211B_PREFIX "zd1211/zd1211b_"
78
e85d0918
DD		 79/* USB device initialization */
80
81static int request_fw_file(
82 const struct firmware **fw, const char *name, struct device *device)
83{
84 int r;
85
86 dev_dbg_f(device, "fw name %s\n", name);
87
88 r = request_firmware(fw, name, device);
89 if (r)
90 dev_err(device,
91 "Could not load firmware file %s. Error number %d\n",
92 name, r);
93 return r;
94}
95
96static inline u16 get_bcdDevice(const struct usb_device *udev)
97{
98 return le16_to_cpu(udev->descriptor.bcdDevice);
99}
100
101enum upload_code_flags {
102 REBOOT = 1,
103};
104
105/* Ensures that MAX_TRANSFER_SIZE is even. */
106#define MAX_TRANSFER_SIZE (USB_MAX_TRANSFER_SIZE & ~1)
107
108static int upload_code(struct usb_device *udev,
109 const u8 *data, size_t size, u16 code_offset, int flags)
110{
111 u8 *p;
112 int r;
113
114 /* USB request blocks need "kmalloced" buffers.
115 */
116 p = kmalloc(MAX_TRANSFER_SIZE, GFP_KERNEL);
117 if (!p) {
118 dev_err(&udev->dev, "out of memory\n");
119 r = -ENOMEM;
120 goto error;
121 }
122
123 size &= ~1;
124 while (size > 0) {
125 size_t transfer_size = size <= MAX_TRANSFER_SIZE ?
126 size : MAX_TRANSFER_SIZE;
127
128 dev_dbg_f(&udev->dev, "transfer size %zu\n", transfer_size);
129
130 memcpy(p, data, transfer_size);
131 r = usb_control_msg(udev, usb_sndctrlpipe(udev, 0),
132 USB_REQ_FIRMWARE_DOWNLOAD,
133 USB_DIR_OUT | USB_TYPE_VENDOR,
134 code_offset, 0, p, transfer_size, 1000 /* ms */);
135 if (r < 0) {
136 dev_err(&udev->dev,
137 "USB control request for firmware upload"
138 " failed. Error number %d\n", r);
139 goto error;
140 }
141 transfer_size = r & ~1;
142
143 size -= transfer_size;
144 data += transfer_size;
145 code_offset += transfer_size/sizeof(u16);
146 }
147
148 if (flags & REBOOT) {
149 u8 ret;
150
151 r = usb_control_msg(udev, usb_rcvctrlpipe(udev, 0),
152 USB_REQ_FIRMWARE_CONFIRM,
153 USB_DIR_IN | USB_TYPE_VENDOR,
154 0, 0, &ret, sizeof(ret), 5000 /* ms */);
155 if (r != sizeof(ret)) {
156 dev_err(&udev->dev,
157 "control request firmeware confirmation failed."
158 " Return value %d\n", r);
159 if (r >= 0)
160 r = -ENODEV;
161 goto error;
162 }
163 if (ret & 0x80) {
164 dev_err(&udev->dev,
165 "Internal error while downloading."
166 " Firmware confirm return value %#04x\n",
167 (unsigned int)ret);
168 r = -ENODEV;
169 goto error;
170 }
171 dev_dbg_f(&udev->dev, "firmware confirm return value %#04x\n",
172 (unsigned int)ret);
173 }
174
175 r = 0;
176error:
177 kfree(p);
178 return r;
179}
180
181static u16 get_word(const void *data, u16 offset)
182{
183 const __le16 *p = data;
184 return le16_to_cpu(p[offset]);
185}
186
187static char *get_fw_name(char *buffer, size_t size, u8 device_type,
188 const char* postfix)
189{
190 scnprintf(buffer, size, "%s%s",
191 device_type == DEVICE_ZD1211B ?
192 FW_ZD1211B_PREFIX : FW_ZD1211_PREFIX,
193 postfix);
194 return buffer;
195}
196
d066c219
DD		 197static int handle_version_mismatch(struct usb_device *udev, u8 device_type,
198 const struct firmware *ub_fw)
199{
200 const struct firmware *ur_fw = NULL;
201 int offset;
202 int r = 0;
203 char fw_name[128];
204
205 r = request_fw_file(&ur_fw,
206 get_fw_name(fw_name, sizeof(fw_name), device_type, "ur"),
207 &udev->dev);
208 if (r)
209 goto error;
210
ee302767 211 r = upload_code(udev, ur_fw->data, ur_fw->size, FW_START, REBOOT);
d066c219
DD		 212 if (r)
213 goto error;
214
ee302767 215 offset = (E2P_BOOT_CODE_OFFSET * sizeof(u16));
d066c219 216 r = upload_code(udev, ub_fw->data + offset, ub_fw->size - offset,
ee302767 217 E2P_START + E2P_BOOT_CODE_OFFSET, REBOOT);
d066c219
DD		 218
219 /* At this point, the vendor driver downloads the whole firmware
220 * image, hacks around with version IDs, and uploads it again,
221 * completely overwriting the boot code. We do not do this here as
222 * it is not required on any tested devices, and it is suspected to
223 * cause problems. */
224error:
225 release_firmware(ur_fw);
226 return r;
227}
228
e85d0918
DD		 229static int upload_firmware(struct usb_device *udev, u8 device_type)
230{
231 int r;
232 u16 fw_bcdDevice;
233 u16 bcdDevice;
234 const struct firmware *ub_fw = NULL;
235 const struct firmware *uph_fw = NULL;
236 char fw_name[128];
237
238 bcdDevice = get_bcdDevice(udev);
239
240 r = request_fw_file(&ub_fw,
241 get_fw_name(fw_name, sizeof(fw_name), device_type, "ub"),
242 &udev->dev);
243 if (r)
244 goto error;
245
ee302767 246 fw_bcdDevice = get_word(ub_fw->data, E2P_DATA_OFFSET);
e85d0918 247
e85d0918
DD		 248 if (fw_bcdDevice != bcdDevice) {
249 dev_info(&udev->dev,
d066c219
DD		 250 "firmware version %#06x and device bootcode version "
251 "%#06x differ\n", fw_bcdDevice, bcdDevice);
252 if (bcdDevice <= 0x4313)
253 dev_warn(&udev->dev, "device has old bootcode, please "
254 "report success or failure\n");
255
256 r = handle_version_mismatch(udev, device_type, ub_fw);
257 if (r)
258 goto error;
e85d0918
DD		 259 } else {
260 dev_dbg_f(&udev->dev,
261 "firmware device id %#06x is equal to the "
262 "actual device id\n", fw_bcdDevice);
263 }
264
265
266 r = request_fw_file(&uph_fw,
267 get_fw_name(fw_name, sizeof(fw_name), device_type, "uphr"),
268 &udev->dev);
269 if (r)
270 goto error;
271
ee302767 272 r = upload_code(udev, uph_fw->data, uph_fw->size, FW_START, REBOOT);
e85d0918
DD		 273 if (r) {
274 dev_err(&udev->dev,
275 "Could not upload firmware code uph. Error number %d\n",
276 r);
277 }
278
279 /* FALL-THROUGH */
280error:
281 release_firmware(ub_fw);
282 release_firmware(uph_fw);
283 return r;
284}
285
e85d0918
DD		 286#define urb_dev(urb) (&(urb)->dev->dev)
287
288static inline void handle_regs_int(struct urb *urb)
289{
290 struct zd_usb *usb = urb->context;
291 struct zd_usb_interrupt *intr = &usb->intr;
292 int len;
293
294 ZD_ASSERT(in_interrupt());
295 spin_lock(&intr->lock);
296
297 if (intr->read_regs_enabled) {
298 intr->read_regs.length = len = urb->actual_length;
299
300 if (len > sizeof(intr->read_regs.buffer))
301 len = sizeof(intr->read_regs.buffer);
302 memcpy(intr->read_regs.buffer, urb->transfer_buffer, len);
303 intr->read_regs_enabled = 0;
304 complete(&intr->read_regs.completion);
305 goto out;
306 }
307
308 dev_dbg_f(urb_dev(urb), "regs interrupt ignored\n");
309out:
310 spin_unlock(&intr->lock);
311}
312
313static inline void handle_retry_failed_int(struct urb *urb)
314{
315 dev_dbg_f(urb_dev(urb), "retry failed interrupt\n");
316}
317
318
7d12e780 319static void int_urb_complete(struct urb *urb)
e85d0918
DD		 320{
321 int r;
322 struct usb_int_header *hdr;
323
324 switch (urb->status) {
325 case 0:
326 break;
327 case -ESHUTDOWN:
328 case -EINVAL:
329 case -ENODEV:
330 case -ENOENT:
331 case -ECONNRESET:
e85d0918 332 case -EPIPE:
b312d799 333 goto kfree;
e85d0918
DD		 334 default:
335 goto resubmit;
336 }
337
338 if (urb->actual_length < sizeof(hdr)) {
339 dev_dbg_f(urb_dev(urb), "error: urb %p to small\n", urb);
340 goto resubmit;
341 }
342
343 hdr = urb->transfer_buffer;
344 if (hdr->type != USB_INT_TYPE) {
345 dev_dbg_f(urb_dev(urb), "error: urb %p wrong type\n", urb);
346 goto resubmit;
347 }
348
349 switch (hdr->id) {
350 case USB_INT_ID_REGS:
351 handle_regs_int(urb);
352 break;
353 case USB_INT_ID_RETRY_FAILED:
354 handle_retry_failed_int(urb);
355 break;
356 default:
357 dev_dbg_f(urb_dev(urb), "error: urb %p unknown id %x\n", urb,
358 (unsigned int)hdr->id);
359 goto resubmit;
360 }
361
362resubmit:
363 r = usb_submit_urb(urb, GFP_ATOMIC);
364 if (r) {
365 dev_dbg_f(urb_dev(urb), "resubmit urb %p\n", urb);
366 goto kfree;
367 }
368 return;
369kfree:
370 kfree(urb->transfer_buffer);
371}
372
373static inline int int_urb_interval(struct usb_device *udev)
374{
375 switch (udev->speed) {
376 case USB_SPEED_HIGH:
377 return 4;
378 case USB_SPEED_LOW:
379 return 10;
380 case USB_SPEED_FULL:
381 default:
382 return 1;
383 }
384}
385
386static inline int usb_int_enabled(struct zd_usb *usb)
387{
388 unsigned long flags;
389 struct zd_usb_interrupt *intr = &usb->intr;
390 struct urb *urb;
391
392 spin_lock_irqsave(&intr->lock, flags);
393 urb = intr->urb;
394 spin_unlock_irqrestore(&intr->lock, flags);
395 return urb != NULL;
396}
397
398int zd_usb_enable_int(struct zd_usb *usb)
399{
400 int r;
401 struct usb_device *udev;
402 struct zd_usb_interrupt *intr = &usb->intr;
403 void *transfer_buffer = NULL;
404 struct urb *urb;
405
406 dev_dbg_f(zd_usb_dev(usb), "\n");
407
408 urb = usb_alloc_urb(0, GFP_NOFS);
409 if (!urb) {
410 r = -ENOMEM;
411 goto out;
412 }
413
414 ZD_ASSERT(!irqs_disabled());
415 spin_lock_irq(&intr->lock);
416 if (intr->urb) {
417 spin_unlock_irq(&intr->lock);
418 r = 0;
419 goto error_free_urb;
420 }
421 intr->urb = urb;
422 spin_unlock_irq(&intr->lock);
423
424 /* TODO: make it a DMA buffer */
425 r = -ENOMEM;
426 transfer_buffer = kmalloc(USB_MAX_EP_INT_BUFFER, GFP_NOFS);
427 if (!transfer_buffer) {
428 dev_dbg_f(zd_usb_dev(usb),
429 "couldn't allocate transfer_buffer\n");
430 goto error_set_urb_null;
431 }
432
433 udev = zd_usb_to_usbdev(usb);
434 usb_fill_int_urb(urb, udev, usb_rcvintpipe(udev, EP_INT_IN),
435 transfer_buffer, USB_MAX_EP_INT_BUFFER,
436 int_urb_complete, usb,
437 intr->interval);
438
439 dev_dbg_f(zd_usb_dev(usb), "submit urb %p\n", intr->urb);
440 r = usb_submit_urb(urb, GFP_NOFS);
441 if (r) {
442 dev_dbg_f(zd_usb_dev(usb),
443 "Couldn't submit urb. Error number %d\n", r);
444 goto error;
445 }
446
447 return 0;
448error:
449 kfree(transfer_buffer);
450error_set_urb_null:
451 spin_lock_irq(&intr->lock);
452 intr->urb = NULL;
453 spin_unlock_irq(&intr->lock);
454error_free_urb:
455 usb_free_urb(urb);
456out:
457 return r;
458}
459
460void zd_usb_disable_int(struct zd_usb *usb)
461{
462 unsigned long flags;
463 struct zd_usb_interrupt *intr = &usb->intr;
464 struct urb *urb;
465
466 spin_lock_irqsave(&intr->lock, flags);
467 urb = intr->urb;
468 if (!urb) {
469 spin_unlock_irqrestore(&intr->lock, flags);
470 return;
471 }
472 intr->urb = NULL;
473 spin_unlock_irqrestore(&intr->lock, flags);
474
475 usb_kill_urb(urb);
476 dev_dbg_f(zd_usb_dev(usb), "urb %p killed\n", urb);
477 usb_free_urb(urb);
478}
479
480static void handle_rx_packet(struct zd_usb *usb, const u8 *buffer,
481 unsigned int length)
482{
483 int i;
484 struct zd_mac *mac = zd_usb_to_mac(usb);
485 const struct rx_length_info *length_info;
486
487 if (length < sizeof(struct rx_length_info)) {
488 /* It's not a complete packet anyhow. */
489 return;
490 }
491 length_info = (struct rx_length_info *)
492 (buffer + length - sizeof(struct rx_length_info));
493
494 /* It might be that three frames are merged into a single URB
495 * transaction. We have to check for the length info tag.
496 *
497 * While testing we discovered that length_info might be unaligned,
498 * because if USB transactions are merged, the last packet will not
499 * be padded. Unaligned access might also happen if the length_info
500 * structure is not present.
501 */
b269825b
UK		 502 if (get_unaligned(&length_info->tag) == cpu_to_le16(RX_LENGTH_INFO_TAG))
503 {
e85d0918
DD		 504 unsigned int l, k, n;
505 for (i = 0, l = 0;; i++) {
b269825b 506 k = le16_to_cpu(get_unaligned(&length_info->length[i]));
850c211c
UK		 507 if (k == 0)
508 return;
e85d0918
DD		 509 n = l+k;
510 if (n > length)
511 return;
4d1feabc 512 zd_mac_rx_irq(mac, buffer+l, k);
e85d0918
DD		 513 if (i >= 2)
514 return;
515 l = (n+3) & ~3;
516 }
517 } else {
4d1feabc 518 zd_mac_rx_irq(mac, buffer, length);
e85d0918
DD		 519 }
520}
521
7d12e780 522static void rx_urb_complete(struct urb *urb)
e85d0918
DD		 523{
524 struct zd_usb *usb;
525 struct zd_usb_rx *rx;
526 const u8 *buffer;
527 unsigned int length;
528
529 switch (urb->status) {
530 case 0:
531 break;
532 case -ESHUTDOWN:
533 case -EINVAL:
534 case -ENODEV:
535 case -ENOENT:
536 case -ECONNRESET:
e85d0918 537 case -EPIPE:
b312d799 538 return;
e85d0918
DD		 539 default:
540 dev_dbg_f(urb_dev(urb), "urb %p error %d\n", urb, urb->status);
541 goto resubmit;
542 }
543
544 buffer = urb->transfer_buffer;
545 length = urb->actual_length;
546 usb = urb->context;
547 rx = &usb->rx;
548
549 if (length%rx->usb_packet_size > rx->usb_packet_size-4) {
550 /* If there is an old first fragment, we don't care. */
551 dev_dbg_f(urb_dev(urb), "*** first fragment ***\n");
552 ZD_ASSERT(length <= ARRAY_SIZE(rx->fragment));
553 spin_lock(&rx->lock);
554 memcpy(rx->fragment, buffer, length);
555 rx->fragment_length = length;
556 spin_unlock(&rx->lock);
557 goto resubmit;
558 }
559
560 spin_lock(&rx->lock);
561 if (rx->fragment_length > 0) {
562 /* We are on a second fragment, we believe */
563 ZD_ASSERT(length + rx->fragment_length <=
564 ARRAY_SIZE(rx->fragment));
565 dev_dbg_f(urb_dev(urb), "*** second fragment ***\n");
566 memcpy(rx->fragment+rx->fragment_length, buffer, length);
567 handle_rx_packet(usb, rx->fragment,
568 rx->fragment_length + length);
569 rx->fragment_length = 0;
570 spin_unlock(&rx->lock);
571 } else {
572 spin_unlock(&rx->lock);
573 handle_rx_packet(usb, buffer, length);
574 }
575
576resubmit:
577 usb_submit_urb(urb, GFP_ATOMIC);
578}
579
c48cf125 580static struct urb *alloc_urb(struct zd_usb *usb)
e85d0918
DD		 581{
582 struct usb_device *udev = zd_usb_to_usbdev(usb);
583 struct urb *urb;
584 void *buffer;
585
586 urb = usb_alloc_urb(0, GFP_NOFS);
587 if (!urb)
588 return NULL;
589 buffer = usb_buffer_alloc(udev, USB_MAX_RX_SIZE, GFP_NOFS,
590 &urb->transfer_dma);
591 if (!buffer) {
592 usb_free_urb(urb);
593 return NULL;
594 }
595
596 usb_fill_bulk_urb(urb, udev, usb_rcvbulkpipe(udev, EP_DATA_IN),
597 buffer, USB_MAX_RX_SIZE,
598 rx_urb_complete, usb);
599 urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
600
601 return urb;
602}
603
c48cf125 604static void free_urb(struct urb *urb)
e85d0918
DD		 605{
606 if (!urb)
607 return;
608 usb_buffer_free(urb->dev, urb->transfer_buffer_length,
609 urb->transfer_buffer, urb->transfer_dma);
610 usb_free_urb(urb);
611}
612
613int zd_usb_enable_rx(struct zd_usb *usb)
614{
615 int i, r;
616 struct zd_usb_rx *rx = &usb->rx;
617 struct urb **urbs;
618
619 dev_dbg_f(zd_usb_dev(usb), "\n");
620
621 r = -ENOMEM;
622 urbs = kcalloc(URBS_COUNT, sizeof(struct urb *), GFP_NOFS);
623 if (!urbs)
624 goto error;
625 for (i = 0; i < URBS_COUNT; i++) {
626 urbs[i] = alloc_urb(usb);
627 if (!urbs[i])
628 goto error;
629 }
630
631 ZD_ASSERT(!irqs_disabled());
632 spin_lock_irq(&rx->lock);
633 if (rx->urbs) {
634 spin_unlock_irq(&rx->lock);
635 r = 0;
636 goto error;
637 }
638 rx->urbs = urbs;
639 rx->urbs_count = URBS_COUNT;
640 spin_unlock_irq(&rx->lock);
641
642 for (i = 0; i < URBS_COUNT; i++) {
643 r = usb_submit_urb(urbs[i], GFP_NOFS);
644 if (r)
645 goto error_submit;
646 }
647
648 return 0;
649error_submit:
650 for (i = 0; i < URBS_COUNT; i++) {
651 usb_kill_urb(urbs[i]);
652 }
653 spin_lock_irq(&rx->lock);
654 rx->urbs = NULL;
655 rx->urbs_count = 0;
656 spin_unlock_irq(&rx->lock);
657error:
658 if (urbs) {
659 for (i = 0; i < URBS_COUNT; i++)
660 free_urb(urbs[i]);
661 }
662 return r;
663}
664
665void zd_usb_disable_rx(struct zd_usb *usb)
666{
667 int i;
668 unsigned long flags;
669 struct urb **urbs;
670 unsigned int count;
671 struct zd_usb_rx *rx = &usb->rx;
672
673 spin_lock_irqsave(&rx->lock, flags);
674 urbs = rx->urbs;
675 count = rx->urbs_count;
676 spin_unlock_irqrestore(&rx->lock, flags);
677 if (!urbs)
678 return;
679
680 for (i = 0; i < count; i++) {
681 usb_kill_urb(urbs[i]);
682 free_urb(urbs[i]);
683 }
684 kfree(urbs);
685
686 spin_lock_irqsave(&rx->lock, flags);
687 rx->urbs = NULL;
688 rx->urbs_count = 0;
689 spin_unlock_irqrestore(&rx->lock, flags);
690}
691
7d12e780 692static void tx_urb_complete(struct urb *urb)
e85d0918
DD		 693{
694 int r;
695
696 switch (urb->status) {
697 case 0:
698 break;
699 case -ESHUTDOWN:
700 case -EINVAL:
701 case -ENODEV:
702 case -ENOENT:
703 case -ECONNRESET:
b312d799 704 case -EPIPE:
e85d0918
DD		 705 dev_dbg_f(urb_dev(urb), "urb %p error %d\n", urb, urb->status);
706 break;
e85d0918
DD		 707 default:
708 dev_dbg_f(urb_dev(urb), "urb %p error %d\n", urb, urb->status);
709 goto resubmit;
710 }
711free_urb:
712 usb_buffer_free(urb->dev, urb->transfer_buffer_length,
713 urb->transfer_buffer, urb->transfer_dma);
714 usb_free_urb(urb);
715 return;
716resubmit:
717 r = usb_submit_urb(urb, GFP_ATOMIC);
718 if (r) {
719 dev_dbg_f(urb_dev(urb), "error resubmit urb %p %d\n", urb, r);
720 goto free_urb;
721 }
722}
723
724/* Puts the frame on the USB endpoint. It doesn't wait for
725 * completion. The frame must contain the control set.
726 */
727int zd_usb_tx(struct zd_usb *usb, const u8 *frame, unsigned int length)
728{
729 int r;
730 struct usb_device *udev = zd_usb_to_usbdev(usb);
731 struct urb *urb;
732 void *buffer;
733
734 urb = usb_alloc_urb(0, GFP_ATOMIC);
735 if (!urb) {
736 r = -ENOMEM;
737 goto out;
738 }
739
740 buffer = usb_buffer_alloc(zd_usb_to_usbdev(usb), length, GFP_ATOMIC,
741 &urb->transfer_dma);
742 if (!buffer) {
743 r = -ENOMEM;
744 goto error_free_urb;
745 }
746 memcpy(buffer, frame, length);
747
748 usb_fill_bulk_urb(urb, udev, usb_sndbulkpipe(udev, EP_DATA_OUT),
749 buffer, length, tx_urb_complete, NULL);
750 urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
751
752 r = usb_submit_urb(urb, GFP_ATOMIC);
753 if (r)
754 goto error;
755 return 0;
756error:
757 usb_buffer_free(zd_usb_to_usbdev(usb), length, buffer,
758 urb->transfer_dma);
759error_free_urb:
760 usb_free_urb(urb);
761out:
762 return r;
763}
764
765static inline void init_usb_interrupt(struct zd_usb *usb)
766{
767 struct zd_usb_interrupt *intr = &usb->intr;
768
769 spin_lock_init(&intr->lock);
770 intr->interval = int_urb_interval(zd_usb_to_usbdev(usb));
771 init_completion(&intr->read_regs.completion);
0ce34bc8 772 intr->read_regs.cr_int_addr = cpu_to_le16((u16)CR_INTERRUPT);
e85d0918
DD		 773}
774
775static inline void init_usb_rx(struct zd_usb *usb)
776{
777 struct zd_usb_rx *rx = &usb->rx;
778 spin_lock_init(&rx->lock);
779 if (interface_to_usbdev(usb->intf)->speed == USB_SPEED_HIGH) {
780 rx->usb_packet_size = 512;
781 } else {
782 rx->usb_packet_size = 64;
783 }
784 ZD_ASSERT(rx->fragment_length == 0);
785}
786
787static inline void init_usb_tx(struct zd_usb *usb)
788{
789 /* FIXME: at this point we will allocate a fixed number of urb's for
790 * use in a cyclic scheme */
791}
792
793void zd_usb_init(struct zd_usb *usb, struct net_device *netdev,
794 struct usb_interface *intf)
795{
796 memset(usb, 0, sizeof(*usb));
797 usb->intf = usb_get_intf(intf);
798 usb_set_intfdata(usb->intf, netdev);
799 init_usb_interrupt(usb);
800 init_usb_tx(usb);
801 init_usb_rx(usb);
802}
803
e85d0918
DD		 804void zd_usb_clear(struct zd_usb *usb)
805{
806 usb_set_intfdata(usb->intf, NULL);
807 usb_put_intf(usb->intf);
c48cf125 808 ZD_MEMCLEAR(usb, sizeof(*usb));
e85d0918
DD		 809 /* FIXME: usb_interrupt, usb_tx, usb_rx? */
810}
811
812static const char *speed(enum usb_device_speed speed)
813{
814 switch (speed) {
815 case USB_SPEED_LOW:
816 return "low";
817 case USB_SPEED_FULL:
818 return "full";
819 case USB_SPEED_HIGH:
820 return "high";
821 default:
822 return "unknown speed";
823 }
824}
825
826static int scnprint_id(struct usb_device *udev, char *buffer, size_t size)
827{
828 return scnprintf(buffer, size, "%04hx:%04hx v%04hx %s",
829 le16_to_cpu(udev->descriptor.idVendor),
830 le16_to_cpu(udev->descriptor.idProduct),
831 get_bcdDevice(udev),
832 speed(udev->speed));
833}
834
835int zd_usb_scnprint_id(struct zd_usb *usb, char *buffer, size_t size)
836{
837 struct usb_device *udev = interface_to_usbdev(usb->intf);
838 return scnprint_id(udev, buffer, size);
839}
840
841#ifdef DEBUG
842static void print_id(struct usb_device *udev)
843{
844 char buffer[40];
845
846 scnprint_id(udev, buffer, sizeof(buffer));
847 buffer[sizeof(buffer)-1] = 0;
848 dev_dbg_f(&udev->dev, "%s\n", buffer);
849}
850#else
851#define print_id(udev) do { } while (0)
852#endif
853
a1030e92
DD		 854static int eject_installer(struct usb_interface *intf)
855{
856 struct usb_device *udev = interface_to_usbdev(intf);
857 struct usb_host_interface *iface_desc = &intf->altsetting[0];
858 struct usb_endpoint_descriptor *endpoint;
859 unsigned char *cmd;
860 u8 bulk_out_ep;
861 int r;
862
863 /* Find bulk out endpoint */
864 endpoint = &iface_desc->endpoint[1].desc;
865 if ((endpoint->bEndpointAddress & USB_TYPE_MASK) == USB_DIR_OUT &&
866 (endpoint->bmAttributes & USB_ENDPOINT_XFERTYPE_MASK) ==
867 USB_ENDPOINT_XFER_BULK) {
868 bulk_out_ep = endpoint->bEndpointAddress;
869 } else {
870 dev_err(&udev->dev,
871 "zd1211rw: Could not find bulk out endpoint\n");
872 return -ENODEV;
873 }
874
875 cmd = kzalloc(31, GFP_KERNEL);
876 if (cmd == NULL)
877 return -ENODEV;
878
879 /* USB bulk command block */
880 cmd[0] = 0x55; /* bulk command signature */
881 cmd[1] = 0x53; /* bulk command signature */
882 cmd[2] = 0x42; /* bulk command signature */
883 cmd[3] = 0x43; /* bulk command signature */
884 cmd[14] = 6; /* command length */
885
886 cmd[15] = 0x1b; /* SCSI command: START STOP UNIT */
887 cmd[19] = 0x2; /* eject disc */
888
889 dev_info(&udev->dev, "Ejecting virtual installer media...\n");
890 r = usb_bulk_msg(udev, usb_sndbulkpipe(udev, bulk_out_ep),
891 cmd, 31, NULL, 2000);
892 kfree(cmd);
893 if (r)
894 return r;
895
896 /* At this point, the device disconnects and reconnects with the real
897 * ID numbers. */
898
899 usb_set_intfdata(intf, NULL);
900 return 0;
901}
902
e85d0918
DD		 903static int probe(struct usb_interface *intf, const struct usb_device_id *id)
904{
905 int r;
906 struct usb_device *udev = interface_to_usbdev(intf);
907 struct net_device *netdev = NULL;
908
909 print_id(udev);
910
a1030e92
DD		 911 if (id->driver_info & DEVICE_INSTALLER)
912 return eject_installer(intf);
913
e85d0918
DD		 914 switch (udev->speed) {
915 case USB_SPEED_LOW:
916 case USB_SPEED_FULL:
917 case USB_SPEED_HIGH:
918 break;
919 default:
920 dev_dbg_f(&intf->dev, "Unknown USB speed\n");
921 r = -ENODEV;
922 goto error;
923 }
924
925 netdev = zd_netdev_alloc(intf);
926 if (netdev == NULL) {
927 r = -ENOMEM;
928 goto error;
929 }
930
931 r = upload_firmware(udev, id->driver_info);
932 if (r) {
933 dev_err(&intf->dev,
934 "couldn't load firmware. Error number %d\n", r);
935 goto error;
936 }
937
938 r = usb_reset_configuration(udev);
939 if (r) {
940 dev_dbg_f(&intf->dev,
941 "couldn't reset configuration. Error number %d\n", r);
942 goto error;
943 }
944
945 /* At this point the interrupt endpoint is not generally enabled. We
946 * save the USB bandwidth until the network device is opened. But
947 * notify that the initialization of the MAC will require the
948 * interrupts to be temporary enabled.
949 */
950 r = zd_mac_init_hw(zd_netdev_mac(netdev), id->driver_info);
951 if (r) {
952 dev_dbg_f(&intf->dev,
953 "couldn't initialize mac. Error number %d\n", r);
954 goto error;
955 }
956
957 r = register_netdev(netdev);
958 if (r) {
959 dev_dbg_f(&intf->dev,
960 "couldn't register netdev. Error number %d\n", r);
961 goto error;
962 }
963
964 dev_dbg_f(&intf->dev, "successful\n");
965 dev_info(&intf->dev,"%s\n", netdev->name);
966 return 0;
967error:
968 usb_reset_device(interface_to_usbdev(intf));
969 zd_netdev_free(netdev);
970 return r;
971}
972
973static void disconnect(struct usb_interface *intf)
974{
975 struct net_device *netdev = zd_intf_to_netdev(intf);
976 struct zd_mac *mac = zd_netdev_mac(netdev);
977 struct zd_usb *usb = &mac->chip.usb;
978
a1030e92
DD		 979 /* Either something really bad happened, or we're just dealing with
980 * a DEVICE_INSTALLER. */
981 if (netdev == NULL)
982 return;
983
e85d0918
DD		 984 dev_dbg_f(zd_usb_dev(usb), "\n");
985
986 zd_netdev_disconnect(netdev);
987
988 /* Just in case something has gone wrong! */
989 zd_usb_disable_rx(usb);
990 zd_usb_disable_int(usb);
991
992 /* If the disconnect has been caused by a removal of the
993 * driver module, the reset allows reloading of the driver. If the
994 * reset will not be executed here, the upload of the firmware in the
995 * probe function caused by the reloading of the driver will fail.
996 */
997 usb_reset_device(interface_to_usbdev(intf));
998
e85d0918
DD		 999 zd_netdev_free(netdev);
1000 dev_dbg(&intf->dev, "disconnected\n");
1001}
1002
1003static struct usb_driver driver = {
1004 .name = "zd1211rw",
1005 .id_table = usb_ids,
1006 .probe = probe,
1007 .disconnect = disconnect,
1008};
1009
bc5f06a8
UK		 1010struct workqueue_struct *zd_workqueue;
1011
e85d0918
DD		 1012static int __init usb_init(void)
1013{
1014 int r;
1015
741fec53 1016 pr_debug("%s usb_init()\n", driver.name);
e85d0918 1017
bc5f06a8
UK		 1018 zd_workqueue = create_singlethread_workqueue(driver.name);
1019 if (zd_workqueue == NULL) {
741fec53 1020 printk(KERN_ERR "%s couldn't create workqueue\n", driver.name);
bc5f06a8
UK		 1021 return -ENOMEM;
1022 }
1023
e85d0918
DD		 1024 r = usb_register(&driver);
1025 if (r) {
741fec53
UK		 1026 printk(KERN_ERR "%s usb_register() failed. Error number %d\n",
1027 driver.name, r);
e85d0918
DD		 1028 return r;
1029 }
1030
741fec53 1031 pr_debug("%s initialized\n", driver.name);
e85d0918
DD		 1032 return 0;
1033}
1034
1035static void __exit usb_exit(void)
1036{
741fec53 1037 pr_debug("%s usb_exit()\n", driver.name);
e85d0918 1038 usb_deregister(&driver);
bc5f06a8 1039 destroy_workqueue(zd_workqueue);
e85d0918
DD		 1040}
1041
1042module_init(usb_init);
1043module_exit(usb_exit);
1044
1045static int usb_int_regs_length(unsigned int count)
1046{
1047 return sizeof(struct usb_int_regs) + count * sizeof(struct reg_data);
1048}
1049
1050static void prepare_read_regs_int(struct zd_usb *usb)
1051{
1052 struct zd_usb_interrupt *intr = &usb->intr;
1053
a68077de 1054 spin_lock_irq(&intr->lock);
e85d0918
DD		 1055 intr->read_regs_enabled = 1;
1056 INIT_COMPLETION(intr->read_regs.completion);
a68077de
UK		 1057 spin_unlock_irq(&intr->lock);
1058}
1059
1060static void disable_read_regs_int(struct zd_usb *usb)
1061{
1062 struct zd_usb_interrupt *intr = &usb->intr;
1063
1064 spin_lock_irq(&intr->lock);
1065 intr->read_regs_enabled = 0;
1066 spin_unlock_irq(&intr->lock);
e85d0918
DD		 1067}
1068
1069static int get_results(struct zd_usb *usb, u16 *values,
1070 struct usb_req_read_regs *req, unsigned int count)
1071{
1072 int r;
1073 int i;
1074 struct zd_usb_interrupt *intr = &usb->intr;
1075 struct read_regs_int *rr = &intr->read_regs;
1076 struct usb_int_regs *regs = (struct usb_int_regs *)rr->buffer;
1077
a68077de 1078 spin_lock_irq(&intr->lock);
e85d0918
DD		 1079
1080 r = -EIO;
1081 /* The created block size seems to be larger than expected.
1082 * However results appear to be correct.
1083 */
1084 if (rr->length < usb_int_regs_length(count)) {
1085 dev_dbg_f(zd_usb_dev(usb),
1086 "error: actual length %d less than expected %d\n",
1087 rr->length, usb_int_regs_length(count));
1088 goto error_unlock;
1089 }
1090 if (rr->length > sizeof(rr->buffer)) {
1091 dev_dbg_f(zd_usb_dev(usb),
1092 "error: actual length %d exceeds buffer size %zu\n",
1093 rr->length, sizeof(rr->buffer));
1094 goto error_unlock;
1095 }
1096
1097 for (i = 0; i < count; i++) {
1098 struct reg_data *rd = &regs->regs[i];
1099 if (rd->addr != req->addr[i]) {
1100 dev_dbg_f(zd_usb_dev(usb),
1101 "rd[%d] addr %#06hx expected %#06hx\n", i,
1102 le16_to_cpu(rd->addr),
1103 le16_to_cpu(req->addr[i]));
1104 goto error_unlock;
1105 }
1106 values[i] = le16_to_cpu(rd->value);
1107 }
1108
1109 r = 0;
1110error_unlock:
a68077de 1111 spin_unlock_irq(&intr->lock);
e85d0918
DD		 1112 return r;
1113}
1114
1115int zd_usb_ioread16v(struct zd_usb *usb, u16 *values,
1116 const zd_addr_t *addresses, unsigned int count)
1117{
1118 int r;
1119 int i, req_len, actual_req_len;
1120 struct usb_device *udev;
1121 struct usb_req_read_regs *req = NULL;
1122 unsigned long timeout;
1123
1124 if (count < 1) {
1125 dev_dbg_f(zd_usb_dev(usb), "error: count is zero\n");
1126 return -EINVAL;
1127 }
1128 if (count > USB_MAX_IOREAD16_COUNT) {
1129 dev_dbg_f(zd_usb_dev(usb),
1130 "error: count %u exceeds possible max %u\n",
1131 count, USB_MAX_IOREAD16_COUNT);
1132 return -EINVAL;
1133 }
1134 if (in_atomic()) {
1135 dev_dbg_f(zd_usb_dev(usb),
1136 "error: io in atomic context not supported\n");
1137 return -EWOULDBLOCK;
1138 }
1139 if (!usb_int_enabled(usb)) {
1140 dev_dbg_f(zd_usb_dev(usb),
1141 "error: usb interrupt not enabled\n");
1142 return -EWOULDBLOCK;
1143 }
1144
1145 req_len = sizeof(struct usb_req_read_regs) + count * sizeof(__le16);
1146 req = kmalloc(req_len, GFP_NOFS);
1147 if (!req)
1148 return -ENOMEM;
1149 req->id = cpu_to_le16(USB_REQ_READ_REGS);
1150 for (i = 0; i < count; i++)
0ce34bc8 1151 req->addr[i] = cpu_to_le16((u16)addresses[i]);
e85d0918
DD		 1152
1153 udev = zd_usb_to_usbdev(usb);
1154 prepare_read_regs_int(usb);
1155 r = usb_bulk_msg(udev, usb_sndbulkpipe(udev, EP_REGS_OUT),
1156 req, req_len, &actual_req_len, 1000 /* ms */);
1157 if (r) {
1158 dev_dbg_f(zd_usb_dev(usb),
1159 "error in usb_bulk_msg(). Error number %d\n", r);
1160 goto error;
1161 }
1162 if (req_len != actual_req_len) {
1163 dev_dbg_f(zd_usb_dev(usb), "error in usb_bulk_msg()\n"
1164 " req_len %d != actual_req_len %d\n",
1165 req_len, actual_req_len);
1166 r = -EIO;
1167 goto error;
1168 }
1169
1170 timeout = wait_for_completion_timeout(&usb->intr.read_regs.completion,
1171 msecs_to_jiffies(1000));
1172 if (!timeout) {
1173 disable_read_regs_int(usb);
1174 dev_dbg_f(zd_usb_dev(usb), "read timed out\n");
1175 r = -ETIMEDOUT;
1176 goto error;
1177 }
1178
1179 r = get_results(usb, values, req, count);
1180error:
1181 kfree(req);
1182 return r;
1183}
1184
1185int zd_usb_iowrite16v(struct zd_usb *usb, const struct zd_ioreq16 *ioreqs,
1186 unsigned int count)
1187{
1188 int r;
1189 struct usb_device *udev;
1190 struct usb_req_write_regs *req = NULL;
1191 int i, req_len, actual_req_len;
1192
1193 if (count == 0)
1194 return 0;
1195 if (count > USB_MAX_IOWRITE16_COUNT) {
1196 dev_dbg_f(zd_usb_dev(usb),
1197 "error: count %u exceeds possible max %u\n",
1198 count, USB_MAX_IOWRITE16_COUNT);
1199 return -EINVAL;
1200 }
1201 if (in_atomic()) {
1202 dev_dbg_f(zd_usb_dev(usb),
1203 "error: io in atomic context not supported\n");
1204 return -EWOULDBLOCK;
1205 }
1206
1207 req_len = sizeof(struct usb_req_write_regs) +
1208 count * sizeof(struct reg_data);
1209 req = kmalloc(req_len, GFP_NOFS);
1210 if (!req)
1211 return -ENOMEM;
1212
1213 req->id = cpu_to_le16(USB_REQ_WRITE_REGS);
1214 for (i = 0; i < count; i++) {
1215 struct reg_data *rw = &req->reg_writes[i];
0ce34bc8 1216 rw->addr = cpu_to_le16((u16)ioreqs[i].addr);
e85d0918
DD		 1217 rw->value = cpu_to_le16(ioreqs[i].value);
1218 }
1219
1220 udev = zd_usb_to_usbdev(usb);
1221 r = usb_bulk_msg(udev, usb_sndbulkpipe(udev, EP_REGS_OUT),
1222 req, req_len, &actual_req_len, 1000 /* ms */);
1223 if (r) {
1224 dev_dbg_f(zd_usb_dev(usb),
1225 "error in usb_bulk_msg(). Error number %d\n", r);
1226 goto error;
1227 }
1228 if (req_len != actual_req_len) {
1229 dev_dbg_f(zd_usb_dev(usb),
1230 "error in usb_bulk_msg()"
1231 " req_len %d != actual_req_len %d\n",
1232 req_len, actual_req_len);
1233 r = -EIO;
1234 goto error;
1235 }
1236
1237 /* FALL-THROUGH with r == 0 */
1238error:
1239 kfree(req);
1240 return r;
1241}
1242
1243int zd_usb_rfwrite(struct zd_usb *usb, u32 value, u8 bits)
1244{
1245 int r;
1246 struct usb_device *udev;
1247 struct usb_req_rfwrite *req = NULL;
1248 int i, req_len, actual_req_len;
1249 u16 bit_value_template;
1250
1251 if (in_atomic()) {
1252 dev_dbg_f(zd_usb_dev(usb),
1253 "error: io in atomic context not supported\n");
1254 return -EWOULDBLOCK;
1255 }
1256 if (bits < USB_MIN_RFWRITE_BIT_COUNT) {
1257 dev_dbg_f(zd_usb_dev(usb),
1258 "error: bits %d are smaller than"
1259 " USB_MIN_RFWRITE_BIT_COUNT %d\n",
1260 bits, USB_MIN_RFWRITE_BIT_COUNT);
1261 return -EINVAL;
1262 }
1263 if (bits > USB_MAX_RFWRITE_BIT_COUNT) {
1264 dev_dbg_f(zd_usb_dev(usb),
1265 "error: bits %d exceed USB_MAX_RFWRITE_BIT_COUNT %d\n",
1266 bits, USB_MAX_RFWRITE_BIT_COUNT);
1267 return -EINVAL;
1268 }
1269#ifdef DEBUG
1270 if (value & (~0UL << bits)) {
1271 dev_dbg_f(zd_usb_dev(usb),
1272 "error: value %#09x has bits >= %d set\n",
1273 value, bits);
1274 return -EINVAL;
1275 }
1276#endif /* DEBUG */
1277
1278 dev_dbg_f(zd_usb_dev(usb), "value %#09x bits %d\n", value, bits);
1279
1280 r = zd_usb_ioread16(usb, &bit_value_template, CR203);
1281 if (r) {
1282 dev_dbg_f(zd_usb_dev(usb),
1283 "error %d: Couldn't read CR203\n", r);
1284 goto out;
1285 }
1286 bit_value_template &= ~(RF_IF_LE|RF_CLK|RF_DATA);
1287
1288 req_len = sizeof(struct usb_req_rfwrite) + bits * sizeof(__le16);
1289 req = kmalloc(req_len, GFP_NOFS);
1290 if (!req)
1291 return -ENOMEM;
1292
1293 req->id = cpu_to_le16(USB_REQ_WRITE_RF);
1294 /* 1: 3683a, but not used in ZYDAS driver */
1295 req->value = cpu_to_le16(2);
1296 req->bits = cpu_to_le16(bits);
1297
1298 for (i = 0; i < bits; i++) {
1299 u16 bv = bit_value_template;
1300 if (value & (1 << (bits-1-i)))
1301 bv |= RF_DATA;
1302 req->bit_values[i] = cpu_to_le16(bv);
1303 }
1304
1305 udev = zd_usb_to_usbdev(usb);
1306 r = usb_bulk_msg(udev, usb_sndbulkpipe(udev, EP_REGS_OUT),
1307 req, req_len, &actual_req_len, 1000 /* ms */);
1308 if (r) {
1309 dev_dbg_f(zd_usb_dev(usb),
1310 "error in usb_bulk_msg(). Error number %d\n", r);
1311 goto out;
1312 }
1313 if (req_len != actual_req_len) {
1314 dev_dbg_f(zd_usb_dev(usb), "error in usb_bulk_msg()"
1315 " req_len %d != actual_req_len %d\n",
1316 req_len, actual_req_len);
1317 r = -EIO;
1318 goto out;
1319 }
1320
1321 /* FALL-THROUGH with r == 0 */
1322out:
1323 kfree(req);
1324 return r;
1325}
Linux 6.x block layer and io_uring tree(s)