Commit | Line | Data |
---|---|---|
66bb42fd DD |
1 | /* ZD1211 USB-WLAN driver for Linux |
2 | * | |
3 | * Copyright (C) 2005-2007 Ulrich Kunitz <kune@deine-taler.de> | |
4 | * Copyright (C) 2006-2007 Daniel Drake <dsd@gentoo.org> | |
5 | * Copyright (C) 2006-2007 Michael Wu <flamingice@sourmilk.net> | |
e85d0918 DD |
6 | * |
7 | * This program is free software; you can redistribute it and/or modify | |
8 | * it under the terms of the GNU General Public License as published by | |
9 | * the Free Software Foundation; either version 2 of the License, or | |
10 | * (at your option) any later version. | |
11 | * | |
12 | * This program is distributed in the hope that it will be useful, | |
13 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
14 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
15 | * GNU General Public License for more details. | |
16 | * | |
17 | * You should have received a copy of the GNU General Public License | |
18 | * along with this program; if not, write to the Free Software | |
19 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA | |
20 | */ | |
21 | ||
d066c219 | 22 | #include <linux/kernel.h> |
e85d0918 | 23 | #include <linux/init.h> |
e85d0918 DD |
24 | #include <linux/firmware.h> |
25 | #include <linux/device.h> | |
26 | #include <linux/errno.h> | |
27 | #include <linux/skbuff.h> | |
28 | #include <linux/usb.h> | |
bc5f06a8 | 29 | #include <linux/workqueue.h> |
459c51ad | 30 | #include <net/mac80211.h> |
c248725b | 31 | #include <asm/unaligned.h> |
e85d0918 DD |
32 | |
33 | #include "zd_def.h" | |
e85d0918 DD |
34 | #include "zd_mac.h" |
35 | #include "zd_usb.h" | |
e85d0918 DD |
36 | |
37 | static struct usb_device_id usb_ids[] = { | |
38 | /* ZD1211 */ | |
39 | { USB_DEVICE(0x0ace, 0x1211), .driver_info = DEVICE_ZD1211 }, | |
40 | { USB_DEVICE(0x07b8, 0x6001), .driver_info = DEVICE_ZD1211 }, | |
41 | { USB_DEVICE(0x126f, 0xa006), .driver_info = DEVICE_ZD1211 }, | |
42 | { USB_DEVICE(0x6891, 0xa727), .driver_info = DEVICE_ZD1211 }, | |
43 | { USB_DEVICE(0x0df6, 0x9071), .driver_info = DEVICE_ZD1211 }, | |
aa1d3a18 | 44 | { USB_DEVICE(0x0df6, 0x9075), .driver_info = DEVICE_ZD1211 }, |
e85d0918 | 45 | { USB_DEVICE(0x157e, 0x300b), .driver_info = DEVICE_ZD1211 }, |
dd2f5538 | 46 | { USB_DEVICE(0x079b, 0x004a), .driver_info = DEVICE_ZD1211 }, |
1b865491 | 47 | { USB_DEVICE(0x1740, 0x2000), .driver_info = DEVICE_ZD1211 }, |
12f39308 | 48 | { USB_DEVICE(0x157e, 0x3204), .driver_info = DEVICE_ZD1211 }, |
4ceb7e99 | 49 | { USB_DEVICE(0x0586, 0x3402), .driver_info = DEVICE_ZD1211 }, |
fca2714f | 50 | { USB_DEVICE(0x0b3b, 0x5630), .driver_info = DEVICE_ZD1211 }, |
fc3e39be | 51 | { USB_DEVICE(0x0b05, 0x170c), .driver_info = DEVICE_ZD1211 }, |
f2423723 DD |
52 | { USB_DEVICE(0x1435, 0x0711), .driver_info = DEVICE_ZD1211 }, |
53 | { USB_DEVICE(0x0586, 0x3409), .driver_info = DEVICE_ZD1211 }, | |
54 | { USB_DEVICE(0x0b3b, 0x1630), .driver_info = DEVICE_ZD1211 }, | |
a362bf57 | 55 | { USB_DEVICE(0x0586, 0x3401), .driver_info = DEVICE_ZD1211 }, |
229782a3 | 56 | { USB_DEVICE(0x14ea, 0xab13), .driver_info = DEVICE_ZD1211 }, |
a3fa3aba | 57 | { USB_DEVICE(0x13b1, 0x001e), .driver_info = DEVICE_ZD1211 }, |
a9eea9ae | 58 | { USB_DEVICE(0x0586, 0x3407), .driver_info = DEVICE_ZD1211 }, |
ababda03 | 59 | { USB_DEVICE(0x129b, 0x1666), .driver_info = DEVICE_ZD1211 }, |
269fca0e | 60 | { USB_DEVICE(0x157e, 0x300a), .driver_info = DEVICE_ZD1211 }, |
e85d0918 DD |
61 | /* ZD1211B */ |
62 | { USB_DEVICE(0x0ace, 0x1215), .driver_info = DEVICE_ZD1211B }, | |
63 | { USB_DEVICE(0x157e, 0x300d), .driver_info = DEVICE_ZD1211B }, | |
dd2f5538 | 64 | { USB_DEVICE(0x079b, 0x0062), .driver_info = DEVICE_ZD1211B }, |
943599ee | 65 | { USB_DEVICE(0x1582, 0x6003), .driver_info = DEVICE_ZD1211B }, |
8e87295b | 66 | { USB_DEVICE(0x050d, 0x705c), .driver_info = DEVICE_ZD1211B }, |
a2bdcc67 DD |
67 | { USB_DEVICE(0x083a, 0x4505), .driver_info = DEVICE_ZD1211B }, |
68 | { USB_DEVICE(0x0471, 0x1236), .driver_info = DEVICE_ZD1211B }, | |
33218ba1 | 69 | { USB_DEVICE(0x13b1, 0x0024), .driver_info = DEVICE_ZD1211B }, |
2e9b2467 | 70 | { USB_DEVICE(0x0586, 0x340f), .driver_info = DEVICE_ZD1211B }, |
aec91028 DD |
71 | { USB_DEVICE(0x0b05, 0x171b), .driver_info = DEVICE_ZD1211B }, |
72 | { USB_DEVICE(0x0586, 0x3410), .driver_info = DEVICE_ZD1211B }, | |
c445a31c | 73 | { USB_DEVICE(0x0baf, 0x0121), .driver_info = DEVICE_ZD1211B }, |
5d082fe8 | 74 | { USB_DEVICE(0x0586, 0x3412), .driver_info = DEVICE_ZD1211B }, |
187bb417 | 75 | { USB_DEVICE(0x0586, 0x3413), .driver_info = DEVICE_ZD1211B }, |
019a6755 | 76 | { USB_DEVICE(0x0053, 0x5301), .driver_info = DEVICE_ZD1211B }, |
93f510bb | 77 | { USB_DEVICE(0x0411, 0x00da), .driver_info = DEVICE_ZD1211B }, |
6eb07250 | 78 | { USB_DEVICE(0x2019, 0x5303), .driver_info = DEVICE_ZD1211B }, |
25343469 | 79 | { USB_DEVICE(0x129b, 0x1667), .driver_info = DEVICE_ZD1211B }, |
8e97afe5 | 80 | { USB_DEVICE(0x0cde, 0x001a), .driver_info = DEVICE_ZD1211B }, |
475fed1e | 81 | { USB_DEVICE(0x0586, 0x340a), .driver_info = DEVICE_ZD1211B }, |
61ef6062 | 82 | { USB_DEVICE(0x0471, 0x1237), .driver_info = DEVICE_ZD1211B }, |
a1030e92 DD |
83 | /* "Driverless" devices that need ejecting */ |
84 | { USB_DEVICE(0x0ace, 0x2011), .driver_info = DEVICE_INSTALLER }, | |
aa1d3a18 | 85 | { USB_DEVICE(0x0ace, 0x20ff), .driver_info = DEVICE_INSTALLER }, |
e85d0918 DD |
86 | {} |
87 | }; | |
88 | ||
89 | MODULE_LICENSE("GPL"); | |
90 | MODULE_DESCRIPTION("USB driver for devices with the ZD1211 chip."); | |
91 | MODULE_AUTHOR("Ulrich Kunitz"); | |
92 | MODULE_AUTHOR("Daniel Drake"); | |
93 | MODULE_VERSION("1.0"); | |
94 | MODULE_DEVICE_TABLE(usb, usb_ids); | |
95 | ||
96 | #define FW_ZD1211_PREFIX "zd1211/zd1211_" | |
97 | #define FW_ZD1211B_PREFIX "zd1211/zd1211b_" | |
98 | ||
e85d0918 | 99 | /* USB device initialization */ |
72e77a8a | 100 | static void int_urb_complete(struct urb *urb); |
e85d0918 DD |
101 | |
102 | static int request_fw_file( | |
103 | const struct firmware **fw, const char *name, struct device *device) | |
104 | { | |
105 | int r; | |
106 | ||
107 | dev_dbg_f(device, "fw name %s\n", name); | |
108 | ||
109 | r = request_firmware(fw, name, device); | |
110 | if (r) | |
111 | dev_err(device, | |
112 | "Could not load firmware file %s. Error number %d\n", | |
113 | name, r); | |
114 | return r; | |
115 | } | |
116 | ||
117 | static inline u16 get_bcdDevice(const struct usb_device *udev) | |
118 | { | |
119 | return le16_to_cpu(udev->descriptor.bcdDevice); | |
120 | } | |
121 | ||
122 | enum upload_code_flags { | |
123 | REBOOT = 1, | |
124 | }; | |
125 | ||
126 | /* Ensures that MAX_TRANSFER_SIZE is even. */ | |
127 | #define MAX_TRANSFER_SIZE (USB_MAX_TRANSFER_SIZE & ~1) | |
128 | ||
129 | static int upload_code(struct usb_device *udev, | |
130 | const u8 *data, size_t size, u16 code_offset, int flags) | |
131 | { | |
132 | u8 *p; | |
133 | int r; | |
134 | ||
135 | /* USB request blocks need "kmalloced" buffers. | |
136 | */ | |
137 | p = kmalloc(MAX_TRANSFER_SIZE, GFP_KERNEL); | |
138 | if (!p) { | |
139 | dev_err(&udev->dev, "out of memory\n"); | |
140 | r = -ENOMEM; | |
141 | goto error; | |
142 | } | |
143 | ||
144 | size &= ~1; | |
145 | while (size > 0) { | |
146 | size_t transfer_size = size <= MAX_TRANSFER_SIZE ? | |
147 | size : MAX_TRANSFER_SIZE; | |
148 | ||
149 | dev_dbg_f(&udev->dev, "transfer size %zu\n", transfer_size); | |
150 | ||
151 | memcpy(p, data, transfer_size); | |
152 | r = usb_control_msg(udev, usb_sndctrlpipe(udev, 0), | |
153 | USB_REQ_FIRMWARE_DOWNLOAD, | |
154 | USB_DIR_OUT | USB_TYPE_VENDOR, | |
155 | code_offset, 0, p, transfer_size, 1000 /* ms */); | |
156 | if (r < 0) { | |
157 | dev_err(&udev->dev, | |
158 | "USB control request for firmware upload" | |
159 | " failed. Error number %d\n", r); | |
160 | goto error; | |
161 | } | |
162 | transfer_size = r & ~1; | |
163 | ||
164 | size -= transfer_size; | |
165 | data += transfer_size; | |
166 | code_offset += transfer_size/sizeof(u16); | |
167 | } | |
168 | ||
169 | if (flags & REBOOT) { | |
170 | u8 ret; | |
171 | ||
172 | r = usb_control_msg(udev, usb_rcvctrlpipe(udev, 0), | |
173 | USB_REQ_FIRMWARE_CONFIRM, | |
174 | USB_DIR_IN | USB_TYPE_VENDOR, | |
175 | 0, 0, &ret, sizeof(ret), 5000 /* ms */); | |
176 | if (r != sizeof(ret)) { | |
177 | dev_err(&udev->dev, | |
178 | "control request firmeware confirmation failed." | |
179 | " Return value %d\n", r); | |
180 | if (r >= 0) | |
181 | r = -ENODEV; | |
182 | goto error; | |
183 | } | |
184 | if (ret & 0x80) { | |
185 | dev_err(&udev->dev, | |
186 | "Internal error while downloading." | |
187 | " Firmware confirm return value %#04x\n", | |
188 | (unsigned int)ret); | |
189 | r = -ENODEV; | |
190 | goto error; | |
191 | } | |
192 | dev_dbg_f(&udev->dev, "firmware confirm return value %#04x\n", | |
193 | (unsigned int)ret); | |
194 | } | |
195 | ||
196 | r = 0; | |
197 | error: | |
198 | kfree(p); | |
199 | return r; | |
200 | } | |
201 | ||
202 | static u16 get_word(const void *data, u16 offset) | |
203 | { | |
204 | const __le16 *p = data; | |
205 | return le16_to_cpu(p[offset]); | |
206 | } | |
207 | ||
74553aed | 208 | static char *get_fw_name(struct zd_usb *usb, char *buffer, size_t size, |
e85d0918 DD |
209 | const char* postfix) |
210 | { | |
211 | scnprintf(buffer, size, "%s%s", | |
74553aed | 212 | usb->is_zd1211b ? |
e85d0918 DD |
213 | FW_ZD1211B_PREFIX : FW_ZD1211_PREFIX, |
214 | postfix); | |
215 | return buffer; | |
216 | } | |
217 | ||
74553aed | 218 | static int handle_version_mismatch(struct zd_usb *usb, |
d066c219 DD |
219 | const struct firmware *ub_fw) |
220 | { | |
74553aed | 221 | struct usb_device *udev = zd_usb_to_usbdev(usb); |
d066c219 DD |
222 | const struct firmware *ur_fw = NULL; |
223 | int offset; | |
224 | int r = 0; | |
225 | char fw_name[128]; | |
226 | ||
227 | r = request_fw_file(&ur_fw, | |
74553aed | 228 | get_fw_name(usb, fw_name, sizeof(fw_name), "ur"), |
d066c219 DD |
229 | &udev->dev); |
230 | if (r) | |
231 | goto error; | |
232 | ||
ee302767 | 233 | r = upload_code(udev, ur_fw->data, ur_fw->size, FW_START, REBOOT); |
d066c219 DD |
234 | if (r) |
235 | goto error; | |
236 | ||
ee302767 | 237 | offset = (E2P_BOOT_CODE_OFFSET * sizeof(u16)); |
d066c219 | 238 | r = upload_code(udev, ub_fw->data + offset, ub_fw->size - offset, |
ee302767 | 239 | E2P_START + E2P_BOOT_CODE_OFFSET, REBOOT); |
d066c219 DD |
240 | |
241 | /* At this point, the vendor driver downloads the whole firmware | |
242 | * image, hacks around with version IDs, and uploads it again, | |
243 | * completely overwriting the boot code. We do not do this here as | |
244 | * it is not required on any tested devices, and it is suspected to | |
245 | * cause problems. */ | |
246 | error: | |
247 | release_firmware(ur_fw); | |
248 | return r; | |
249 | } | |
250 | ||
74553aed | 251 | static int upload_firmware(struct zd_usb *usb) |
e85d0918 DD |
252 | { |
253 | int r; | |
254 | u16 fw_bcdDevice; | |
255 | u16 bcdDevice; | |
74553aed | 256 | struct usb_device *udev = zd_usb_to_usbdev(usb); |
e85d0918 DD |
257 | const struct firmware *ub_fw = NULL; |
258 | const struct firmware *uph_fw = NULL; | |
259 | char fw_name[128]; | |
260 | ||
261 | bcdDevice = get_bcdDevice(udev); | |
262 | ||
263 | r = request_fw_file(&ub_fw, | |
74553aed | 264 | get_fw_name(usb, fw_name, sizeof(fw_name), "ub"), |
e85d0918 DD |
265 | &udev->dev); |
266 | if (r) | |
267 | goto error; | |
268 | ||
ee302767 | 269 | fw_bcdDevice = get_word(ub_fw->data, E2P_DATA_OFFSET); |
e85d0918 | 270 | |
e85d0918 DD |
271 | if (fw_bcdDevice != bcdDevice) { |
272 | dev_info(&udev->dev, | |
d066c219 DD |
273 | "firmware version %#06x and device bootcode version " |
274 | "%#06x differ\n", fw_bcdDevice, bcdDevice); | |
275 | if (bcdDevice <= 0x4313) | |
276 | dev_warn(&udev->dev, "device has old bootcode, please " | |
277 | "report success or failure\n"); | |
278 | ||
74553aed | 279 | r = handle_version_mismatch(usb, ub_fw); |
d066c219 DD |
280 | if (r) |
281 | goto error; | |
e85d0918 DD |
282 | } else { |
283 | dev_dbg_f(&udev->dev, | |
284 | "firmware device id %#06x is equal to the " | |
285 | "actual device id\n", fw_bcdDevice); | |
286 | } | |
287 | ||
288 | ||
289 | r = request_fw_file(&uph_fw, | |
74553aed | 290 | get_fw_name(usb, fw_name, sizeof(fw_name), "uphr"), |
e85d0918 DD |
291 | &udev->dev); |
292 | if (r) | |
293 | goto error; | |
294 | ||
ee302767 | 295 | r = upload_code(udev, uph_fw->data, uph_fw->size, FW_START, REBOOT); |
e85d0918 DD |
296 | if (r) { |
297 | dev_err(&udev->dev, | |
298 | "Could not upload firmware code uph. Error number %d\n", | |
299 | r); | |
300 | } | |
301 | ||
302 | /* FALL-THROUGH */ | |
303 | error: | |
304 | release_firmware(ub_fw); | |
305 | release_firmware(uph_fw); | |
306 | return r; | |
307 | } | |
308 | ||
74553aed DD |
309 | /* Read data from device address space using "firmware interface" which does |
310 | * not require firmware to be loaded. */ | |
311 | int zd_usb_read_fw(struct zd_usb *usb, zd_addr_t addr, u8 *data, u16 len) | |
312 | { | |
313 | int r; | |
314 | struct usb_device *udev = zd_usb_to_usbdev(usb); | |
315 | ||
316 | r = usb_control_msg(udev, usb_rcvctrlpipe(udev, 0), | |
317 | USB_REQ_FIRMWARE_READ_DATA, USB_DIR_IN | 0x40, addr, 0, | |
318 | data, len, 5000); | |
319 | if (r < 0) { | |
320 | dev_err(&udev->dev, | |
321 | "read over firmware interface failed: %d\n", r); | |
322 | return r; | |
323 | } else if (r != len) { | |
324 | dev_err(&udev->dev, | |
325 | "incomplete read over firmware interface: %d/%d\n", | |
326 | r, len); | |
327 | return -EIO; | |
328 | } | |
329 | ||
330 | return 0; | |
331 | } | |
332 | ||
e85d0918 DD |
333 | #define urb_dev(urb) (&(urb)->dev->dev) |
334 | ||
335 | static inline void handle_regs_int(struct urb *urb) | |
336 | { | |
337 | struct zd_usb *usb = urb->context; | |
338 | struct zd_usb_interrupt *intr = &usb->intr; | |
339 | int len; | |
72e77a8a | 340 | u16 int_num; |
e85d0918 DD |
341 | |
342 | ZD_ASSERT(in_interrupt()); | |
343 | spin_lock(&intr->lock); | |
344 | ||
4ec7ffa2 | 345 | int_num = le16_to_cpu(*(__le16 *)(urb->transfer_buffer+2)); |
72e77a8a LCC |
346 | if (int_num == CR_INTERRUPT) { |
347 | struct zd_mac *mac = zd_hw_mac(zd_usb_to_hw(urb->context)); | |
348 | memcpy(&mac->intr_buffer, urb->transfer_buffer, | |
349 | USB_MAX_EP_INT_BUFFER); | |
350 | schedule_work(&mac->process_intr); | |
351 | } else if (intr->read_regs_enabled) { | |
e85d0918 DD |
352 | intr->read_regs.length = len = urb->actual_length; |
353 | ||
354 | if (len > sizeof(intr->read_regs.buffer)) | |
355 | len = sizeof(intr->read_regs.buffer); | |
356 | memcpy(intr->read_regs.buffer, urb->transfer_buffer, len); | |
357 | intr->read_regs_enabled = 0; | |
358 | complete(&intr->read_regs.completion); | |
359 | goto out; | |
360 | } | |
361 | ||
e85d0918 DD |
362 | out: |
363 | spin_unlock(&intr->lock); | |
364 | } | |
365 | ||
7d12e780 | 366 | static void int_urb_complete(struct urb *urb) |
e85d0918 DD |
367 | { |
368 | int r; | |
369 | struct usb_int_header *hdr; | |
370 | ||
371 | switch (urb->status) { | |
372 | case 0: | |
373 | break; | |
374 | case -ESHUTDOWN: | |
375 | case -EINVAL: | |
376 | case -ENODEV: | |
377 | case -ENOENT: | |
378 | case -ECONNRESET: | |
e85d0918 | 379 | case -EPIPE: |
b312d799 | 380 | goto kfree; |
e85d0918 DD |
381 | default: |
382 | goto resubmit; | |
383 | } | |
384 | ||
385 | if (urb->actual_length < sizeof(hdr)) { | |
386 | dev_dbg_f(urb_dev(urb), "error: urb %p to small\n", urb); | |
387 | goto resubmit; | |
388 | } | |
389 | ||
390 | hdr = urb->transfer_buffer; | |
391 | if (hdr->type != USB_INT_TYPE) { | |
392 | dev_dbg_f(urb_dev(urb), "error: urb %p wrong type\n", urb); | |
393 | goto resubmit; | |
394 | } | |
395 | ||
396 | switch (hdr->id) { | |
397 | case USB_INT_ID_REGS: | |
398 | handle_regs_int(urb); | |
399 | break; | |
400 | case USB_INT_ID_RETRY_FAILED: | |
459c51ad | 401 | zd_mac_tx_failed(zd_usb_to_hw(urb->context)); |
e85d0918 DD |
402 | break; |
403 | default: | |
404 | dev_dbg_f(urb_dev(urb), "error: urb %p unknown id %x\n", urb, | |
405 | (unsigned int)hdr->id); | |
406 | goto resubmit; | |
407 | } | |
408 | ||
409 | resubmit: | |
410 | r = usb_submit_urb(urb, GFP_ATOMIC); | |
411 | if (r) { | |
412 | dev_dbg_f(urb_dev(urb), "resubmit urb %p\n", urb); | |
413 | goto kfree; | |
414 | } | |
415 | return; | |
416 | kfree: | |
417 | kfree(urb->transfer_buffer); | |
418 | } | |
419 | ||
420 | static inline int int_urb_interval(struct usb_device *udev) | |
421 | { | |
422 | switch (udev->speed) { | |
423 | case USB_SPEED_HIGH: | |
424 | return 4; | |
425 | case USB_SPEED_LOW: | |
426 | return 10; | |
427 | case USB_SPEED_FULL: | |
428 | default: | |
429 | return 1; | |
430 | } | |
431 | } | |
432 | ||
433 | static inline int usb_int_enabled(struct zd_usb *usb) | |
434 | { | |
435 | unsigned long flags; | |
436 | struct zd_usb_interrupt *intr = &usb->intr; | |
437 | struct urb *urb; | |
438 | ||
439 | spin_lock_irqsave(&intr->lock, flags); | |
440 | urb = intr->urb; | |
441 | spin_unlock_irqrestore(&intr->lock, flags); | |
442 | return urb != NULL; | |
443 | } | |
444 | ||
445 | int zd_usb_enable_int(struct zd_usb *usb) | |
446 | { | |
447 | int r; | |
448 | struct usb_device *udev; | |
449 | struct zd_usb_interrupt *intr = &usb->intr; | |
450 | void *transfer_buffer = NULL; | |
451 | struct urb *urb; | |
452 | ||
453 | dev_dbg_f(zd_usb_dev(usb), "\n"); | |
454 | ||
35c3404e | 455 | urb = usb_alloc_urb(0, GFP_KERNEL); |
e85d0918 DD |
456 | if (!urb) { |
457 | r = -ENOMEM; | |
458 | goto out; | |
459 | } | |
460 | ||
461 | ZD_ASSERT(!irqs_disabled()); | |
462 | spin_lock_irq(&intr->lock); | |
463 | if (intr->urb) { | |
464 | spin_unlock_irq(&intr->lock); | |
465 | r = 0; | |
466 | goto error_free_urb; | |
467 | } | |
468 | intr->urb = urb; | |
469 | spin_unlock_irq(&intr->lock); | |
470 | ||
471 | /* TODO: make it a DMA buffer */ | |
472 | r = -ENOMEM; | |
35c3404e | 473 | transfer_buffer = kmalloc(USB_MAX_EP_INT_BUFFER, GFP_KERNEL); |
e85d0918 DD |
474 | if (!transfer_buffer) { |
475 | dev_dbg_f(zd_usb_dev(usb), | |
476 | "couldn't allocate transfer_buffer\n"); | |
477 | goto error_set_urb_null; | |
478 | } | |
479 | ||
480 | udev = zd_usb_to_usbdev(usb); | |
481 | usb_fill_int_urb(urb, udev, usb_rcvintpipe(udev, EP_INT_IN), | |
482 | transfer_buffer, USB_MAX_EP_INT_BUFFER, | |
483 | int_urb_complete, usb, | |
484 | intr->interval); | |
485 | ||
486 | dev_dbg_f(zd_usb_dev(usb), "submit urb %p\n", intr->urb); | |
35c3404e | 487 | r = usb_submit_urb(urb, GFP_KERNEL); |
e85d0918 DD |
488 | if (r) { |
489 | dev_dbg_f(zd_usb_dev(usb), | |
490 | "Couldn't submit urb. Error number %d\n", r); | |
491 | goto error; | |
492 | } | |
493 | ||
494 | return 0; | |
495 | error: | |
496 | kfree(transfer_buffer); | |
497 | error_set_urb_null: | |
498 | spin_lock_irq(&intr->lock); | |
499 | intr->urb = NULL; | |
500 | spin_unlock_irq(&intr->lock); | |
501 | error_free_urb: | |
502 | usb_free_urb(urb); | |
503 | out: | |
504 | return r; | |
505 | } | |
506 | ||
507 | void zd_usb_disable_int(struct zd_usb *usb) | |
508 | { | |
509 | unsigned long flags; | |
510 | struct zd_usb_interrupt *intr = &usb->intr; | |
511 | struct urb *urb; | |
512 | ||
513 | spin_lock_irqsave(&intr->lock, flags); | |
514 | urb = intr->urb; | |
515 | if (!urb) { | |
516 | spin_unlock_irqrestore(&intr->lock, flags); | |
517 | return; | |
518 | } | |
519 | intr->urb = NULL; | |
520 | spin_unlock_irqrestore(&intr->lock, flags); | |
521 | ||
522 | usb_kill_urb(urb); | |
523 | dev_dbg_f(zd_usb_dev(usb), "urb %p killed\n", urb); | |
524 | usb_free_urb(urb); | |
525 | } | |
526 | ||
527 | static void handle_rx_packet(struct zd_usb *usb, const u8 *buffer, | |
528 | unsigned int length) | |
529 | { | |
530 | int i; | |
e85d0918 DD |
531 | const struct rx_length_info *length_info; |
532 | ||
533 | if (length < sizeof(struct rx_length_info)) { | |
534 | /* It's not a complete packet anyhow. */ | |
535 | return; | |
536 | } | |
537 | length_info = (struct rx_length_info *) | |
538 | (buffer + length - sizeof(struct rx_length_info)); | |
539 | ||
540 | /* It might be that three frames are merged into a single URB | |
541 | * transaction. We have to check for the length info tag. | |
542 | * | |
543 | * While testing we discovered that length_info might be unaligned, | |
544 | * because if USB transactions are merged, the last packet will not | |
545 | * be padded. Unaligned access might also happen if the length_info | |
546 | * structure is not present. | |
547 | */ | |
533dd1b0 | 548 | if (get_unaligned_le16(&length_info->tag) == RX_LENGTH_INFO_TAG) |
b269825b | 549 | { |
e85d0918 DD |
550 | unsigned int l, k, n; |
551 | for (i = 0, l = 0;; i++) { | |
533dd1b0 | 552 | k = get_unaligned_le16(&length_info->length[i]); |
850c211c UK |
553 | if (k == 0) |
554 | return; | |
e85d0918 DD |
555 | n = l+k; |
556 | if (n > length) | |
557 | return; | |
459c51ad | 558 | zd_mac_rx(zd_usb_to_hw(usb), buffer+l, k); |
e85d0918 DD |
559 | if (i >= 2) |
560 | return; | |
561 | l = (n+3) & ~3; | |
562 | } | |
563 | } else { | |
459c51ad | 564 | zd_mac_rx(zd_usb_to_hw(usb), buffer, length); |
e85d0918 DD |
565 | } |
566 | } | |
567 | ||
7d12e780 | 568 | static void rx_urb_complete(struct urb *urb) |
e85d0918 DD |
569 | { |
570 | struct zd_usb *usb; | |
571 | struct zd_usb_rx *rx; | |
572 | const u8 *buffer; | |
573 | unsigned int length; | |
574 | ||
575 | switch (urb->status) { | |
576 | case 0: | |
577 | break; | |
578 | case -ESHUTDOWN: | |
579 | case -EINVAL: | |
580 | case -ENODEV: | |
581 | case -ENOENT: | |
582 | case -ECONNRESET: | |
e85d0918 | 583 | case -EPIPE: |
b312d799 | 584 | return; |
e85d0918 DD |
585 | default: |
586 | dev_dbg_f(urb_dev(urb), "urb %p error %d\n", urb, urb->status); | |
587 | goto resubmit; | |
588 | } | |
589 | ||
590 | buffer = urb->transfer_buffer; | |
591 | length = urb->actual_length; | |
592 | usb = urb->context; | |
593 | rx = &usb->rx; | |
594 | ||
595 | if (length%rx->usb_packet_size > rx->usb_packet_size-4) { | |
596 | /* If there is an old first fragment, we don't care. */ | |
597 | dev_dbg_f(urb_dev(urb), "*** first fragment ***\n"); | |
598 | ZD_ASSERT(length <= ARRAY_SIZE(rx->fragment)); | |
599 | spin_lock(&rx->lock); | |
600 | memcpy(rx->fragment, buffer, length); | |
601 | rx->fragment_length = length; | |
602 | spin_unlock(&rx->lock); | |
603 | goto resubmit; | |
604 | } | |
605 | ||
606 | spin_lock(&rx->lock); | |
607 | if (rx->fragment_length > 0) { | |
608 | /* We are on a second fragment, we believe */ | |
609 | ZD_ASSERT(length + rx->fragment_length <= | |
610 | ARRAY_SIZE(rx->fragment)); | |
611 | dev_dbg_f(urb_dev(urb), "*** second fragment ***\n"); | |
612 | memcpy(rx->fragment+rx->fragment_length, buffer, length); | |
613 | handle_rx_packet(usb, rx->fragment, | |
614 | rx->fragment_length + length); | |
615 | rx->fragment_length = 0; | |
616 | spin_unlock(&rx->lock); | |
617 | } else { | |
618 | spin_unlock(&rx->lock); | |
619 | handle_rx_packet(usb, buffer, length); | |
620 | } | |
621 | ||
622 | resubmit: | |
623 | usb_submit_urb(urb, GFP_ATOMIC); | |
624 | } | |
625 | ||
459c51ad | 626 | static struct urb *alloc_rx_urb(struct zd_usb *usb) |
e85d0918 DD |
627 | { |
628 | struct usb_device *udev = zd_usb_to_usbdev(usb); | |
629 | struct urb *urb; | |
630 | void *buffer; | |
631 | ||
35c3404e | 632 | urb = usb_alloc_urb(0, GFP_KERNEL); |
e85d0918 DD |
633 | if (!urb) |
634 | return NULL; | |
35c3404e | 635 | buffer = usb_buffer_alloc(udev, USB_MAX_RX_SIZE, GFP_KERNEL, |
e85d0918 DD |
636 | &urb->transfer_dma); |
637 | if (!buffer) { | |
638 | usb_free_urb(urb); | |
639 | return NULL; | |
640 | } | |
641 | ||
642 | usb_fill_bulk_urb(urb, udev, usb_rcvbulkpipe(udev, EP_DATA_IN), | |
643 | buffer, USB_MAX_RX_SIZE, | |
644 | rx_urb_complete, usb); | |
645 | urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP; | |
646 | ||
647 | return urb; | |
648 | } | |
649 | ||
459c51ad | 650 | static void free_rx_urb(struct urb *urb) |
e85d0918 DD |
651 | { |
652 | if (!urb) | |
653 | return; | |
654 | usb_buffer_free(urb->dev, urb->transfer_buffer_length, | |
655 | urb->transfer_buffer, urb->transfer_dma); | |
656 | usb_free_urb(urb); | |
657 | } | |
658 | ||
659 | int zd_usb_enable_rx(struct zd_usb *usb) | |
660 | { | |
661 | int i, r; | |
662 | struct zd_usb_rx *rx = &usb->rx; | |
663 | struct urb **urbs; | |
664 | ||
665 | dev_dbg_f(zd_usb_dev(usb), "\n"); | |
666 | ||
667 | r = -ENOMEM; | |
459c51ad | 668 | urbs = kcalloc(RX_URBS_COUNT, sizeof(struct urb *), GFP_KERNEL); |
e85d0918 DD |
669 | if (!urbs) |
670 | goto error; | |
459c51ad DD |
671 | for (i = 0; i < RX_URBS_COUNT; i++) { |
672 | urbs[i] = alloc_rx_urb(usb); | |
e85d0918 DD |
673 | if (!urbs[i]) |
674 | goto error; | |
675 | } | |
676 | ||
677 | ZD_ASSERT(!irqs_disabled()); | |
678 | spin_lock_irq(&rx->lock); | |
679 | if (rx->urbs) { | |
680 | spin_unlock_irq(&rx->lock); | |
681 | r = 0; | |
682 | goto error; | |
683 | } | |
684 | rx->urbs = urbs; | |
459c51ad | 685 | rx->urbs_count = RX_URBS_COUNT; |
e85d0918 DD |
686 | spin_unlock_irq(&rx->lock); |
687 | ||
459c51ad | 688 | for (i = 0; i < RX_URBS_COUNT; i++) { |
35c3404e | 689 | r = usb_submit_urb(urbs[i], GFP_KERNEL); |
e85d0918 DD |
690 | if (r) |
691 | goto error_submit; | |
692 | } | |
693 | ||
694 | return 0; | |
695 | error_submit: | |
459c51ad | 696 | for (i = 0; i < RX_URBS_COUNT; i++) { |
e85d0918 DD |
697 | usb_kill_urb(urbs[i]); |
698 | } | |
699 | spin_lock_irq(&rx->lock); | |
700 | rx->urbs = NULL; | |
701 | rx->urbs_count = 0; | |
702 | spin_unlock_irq(&rx->lock); | |
703 | error: | |
704 | if (urbs) { | |
459c51ad DD |
705 | for (i = 0; i < RX_URBS_COUNT; i++) |
706 | free_rx_urb(urbs[i]); | |
e85d0918 DD |
707 | } |
708 | return r; | |
709 | } | |
710 | ||
711 | void zd_usb_disable_rx(struct zd_usb *usb) | |
712 | { | |
713 | int i; | |
714 | unsigned long flags; | |
715 | struct urb **urbs; | |
716 | unsigned int count; | |
717 | struct zd_usb_rx *rx = &usb->rx; | |
718 | ||
719 | spin_lock_irqsave(&rx->lock, flags); | |
720 | urbs = rx->urbs; | |
721 | count = rx->urbs_count; | |
722 | spin_unlock_irqrestore(&rx->lock, flags); | |
723 | if (!urbs) | |
724 | return; | |
725 | ||
726 | for (i = 0; i < count; i++) { | |
727 | usb_kill_urb(urbs[i]); | |
459c51ad | 728 | free_rx_urb(urbs[i]); |
e85d0918 DD |
729 | } |
730 | kfree(urbs); | |
731 | ||
732 | spin_lock_irqsave(&rx->lock, flags); | |
733 | rx->urbs = NULL; | |
734 | rx->urbs_count = 0; | |
735 | spin_unlock_irqrestore(&rx->lock, flags); | |
736 | } | |
737 | ||
459c51ad DD |
738 | /** |
739 | * zd_usb_disable_tx - disable transmission | |
740 | * @usb: the zd1211rw-private USB structure | |
741 | * | |
742 | * Frees all URBs in the free list and marks the transmission as disabled. | |
743 | */ | |
744 | void zd_usb_disable_tx(struct zd_usb *usb) | |
745 | { | |
746 | struct zd_usb_tx *tx = &usb->tx; | |
747 | unsigned long flags; | |
748 | struct list_head *pos, *n; | |
749 | ||
750 | spin_lock_irqsave(&tx->lock, flags); | |
751 | list_for_each_safe(pos, n, &tx->free_urb_list) { | |
752 | list_del(pos); | |
753 | usb_free_urb(list_entry(pos, struct urb, urb_list)); | |
754 | } | |
755 | tx->enabled = 0; | |
756 | tx->submitted_urbs = 0; | |
757 | /* The stopped state is ignored, relying on ieee80211_wake_queues() | |
758 | * in a potentionally following zd_usb_enable_tx(). | |
759 | */ | |
760 | spin_unlock_irqrestore(&tx->lock, flags); | |
761 | } | |
762 | ||
763 | /** | |
764 | * zd_usb_enable_tx - enables transmission | |
765 | * @usb: a &struct zd_usb pointer | |
766 | * | |
767 | * This function enables transmission and prepares the &zd_usb_tx data | |
768 | * structure. | |
769 | */ | |
770 | void zd_usb_enable_tx(struct zd_usb *usb) | |
771 | { | |
772 | unsigned long flags; | |
773 | struct zd_usb_tx *tx = &usb->tx; | |
774 | ||
775 | spin_lock_irqsave(&tx->lock, flags); | |
776 | tx->enabled = 1; | |
777 | tx->submitted_urbs = 0; | |
778 | ieee80211_wake_queues(zd_usb_to_hw(usb)); | |
779 | tx->stopped = 0; | |
780 | spin_unlock_irqrestore(&tx->lock, flags); | |
781 | } | |
782 | ||
783 | /** | |
784 | * alloc_tx_urb - provides an tx URB | |
785 | * @usb: a &struct zd_usb pointer | |
786 | * | |
787 | * Allocates a new URB. If possible takes the urb from the free list in | |
788 | * usb->tx. | |
789 | */ | |
790 | static struct urb *alloc_tx_urb(struct zd_usb *usb) | |
791 | { | |
792 | struct zd_usb_tx *tx = &usb->tx; | |
793 | unsigned long flags; | |
794 | struct list_head *entry; | |
795 | struct urb *urb; | |
796 | ||
797 | spin_lock_irqsave(&tx->lock, flags); | |
798 | if (list_empty(&tx->free_urb_list)) { | |
799 | urb = usb_alloc_urb(0, GFP_ATOMIC); | |
800 | goto out; | |
801 | } | |
802 | entry = tx->free_urb_list.next; | |
803 | list_del(entry); | |
804 | urb = list_entry(entry, struct urb, urb_list); | |
805 | out: | |
806 | spin_unlock_irqrestore(&tx->lock, flags); | |
807 | return urb; | |
808 | } | |
809 | ||
810 | /** | |
811 | * free_tx_urb - frees a used tx URB | |
812 | * @usb: a &struct zd_usb pointer | |
813 | * @urb: URB to be freed | |
814 | * | |
815 | * Frees the the transmission URB, which means to put it on the free URB | |
816 | * list. | |
817 | */ | |
818 | static void free_tx_urb(struct zd_usb *usb, struct urb *urb) | |
819 | { | |
820 | struct zd_usb_tx *tx = &usb->tx; | |
821 | unsigned long flags; | |
822 | ||
823 | spin_lock_irqsave(&tx->lock, flags); | |
824 | if (!tx->enabled) { | |
825 | usb_free_urb(urb); | |
826 | goto out; | |
827 | } | |
828 | list_add(&urb->urb_list, &tx->free_urb_list); | |
829 | out: | |
830 | spin_unlock_irqrestore(&tx->lock, flags); | |
831 | } | |
832 | ||
833 | static void tx_dec_submitted_urbs(struct zd_usb *usb) | |
834 | { | |
835 | struct zd_usb_tx *tx = &usb->tx; | |
836 | unsigned long flags; | |
837 | ||
838 | spin_lock_irqsave(&tx->lock, flags); | |
839 | --tx->submitted_urbs; | |
840 | if (tx->stopped && tx->submitted_urbs <= ZD_USB_TX_LOW) { | |
841 | ieee80211_wake_queues(zd_usb_to_hw(usb)); | |
842 | tx->stopped = 0; | |
843 | } | |
844 | spin_unlock_irqrestore(&tx->lock, flags); | |
845 | } | |
846 | ||
847 | static void tx_inc_submitted_urbs(struct zd_usb *usb) | |
848 | { | |
849 | struct zd_usb_tx *tx = &usb->tx; | |
850 | unsigned long flags; | |
851 | ||
852 | spin_lock_irqsave(&tx->lock, flags); | |
853 | ++tx->submitted_urbs; | |
854 | if (!tx->stopped && tx->submitted_urbs > ZD_USB_TX_HIGH) { | |
855 | ieee80211_stop_queues(zd_usb_to_hw(usb)); | |
856 | tx->stopped = 1; | |
857 | } | |
858 | spin_unlock_irqrestore(&tx->lock, flags); | |
859 | } | |
860 | ||
861 | /** | |
862 | * tx_urb_complete - completes the execution of an URB | |
863 | * @urb: a URB | |
864 | * | |
865 | * This function is called if the URB has been transferred to a device or an | |
866 | * error has happened. | |
867 | */ | |
7d12e780 | 868 | static void tx_urb_complete(struct urb *urb) |
e85d0918 DD |
869 | { |
870 | int r; | |
459c51ad DD |
871 | struct sk_buff *skb; |
872 | struct zd_tx_skb_control_block *cb; | |
873 | struct zd_usb *usb; | |
e85d0918 DD |
874 | |
875 | switch (urb->status) { | |
876 | case 0: | |
877 | break; | |
878 | case -ESHUTDOWN: | |
879 | case -EINVAL: | |
880 | case -ENODEV: | |
881 | case -ENOENT: | |
882 | case -ECONNRESET: | |
b312d799 | 883 | case -EPIPE: |
e85d0918 DD |
884 | dev_dbg_f(urb_dev(urb), "urb %p error %d\n", urb, urb->status); |
885 | break; | |
e85d0918 DD |
886 | default: |
887 | dev_dbg_f(urb_dev(urb), "urb %p error %d\n", urb, urb->status); | |
888 | goto resubmit; | |
889 | } | |
890 | free_urb: | |
459c51ad | 891 | skb = (struct sk_buff *)urb->context; |
dbabad0c JB |
892 | /* |
893 | * grab 'usb' pointer before handing off the skb (since | |
894 | * it might be freed by zd_mac_tx_to_dev or mac80211) | |
895 | */ | |
459c51ad DD |
896 | cb = (struct zd_tx_skb_control_block *)skb->cb; |
897 | usb = &zd_hw_mac(cb->hw)->chip.usb; | |
dbabad0c | 898 | zd_mac_tx_to_dev(skb, urb->status); |
459c51ad DD |
899 | free_tx_urb(usb, urb); |
900 | tx_dec_submitted_urbs(usb); | |
e85d0918 DD |
901 | return; |
902 | resubmit: | |
903 | r = usb_submit_urb(urb, GFP_ATOMIC); | |
904 | if (r) { | |
905 | dev_dbg_f(urb_dev(urb), "error resubmit urb %p %d\n", urb, r); | |
906 | goto free_urb; | |
907 | } | |
908 | } | |
909 | ||
459c51ad DD |
910 | /** |
911 | * zd_usb_tx: initiates transfer of a frame of the device | |
912 | * | |
913 | * @usb: the zd1211rw-private USB structure | |
914 | * @skb: a &struct sk_buff pointer | |
915 | * | |
916 | * This function tranmits a frame to the device. It doesn't wait for | |
917 | * completion. The frame must contain the control set and have all the | |
918 | * control set information available. | |
919 | * | |
920 | * The function returns 0 if the transfer has been successfully initiated. | |
e85d0918 | 921 | */ |
459c51ad | 922 | int zd_usb_tx(struct zd_usb *usb, struct sk_buff *skb) |
e85d0918 DD |
923 | { |
924 | int r; | |
925 | struct usb_device *udev = zd_usb_to_usbdev(usb); | |
926 | struct urb *urb; | |
e85d0918 | 927 | |
459c51ad | 928 | urb = alloc_tx_urb(usb); |
e85d0918 DD |
929 | if (!urb) { |
930 | r = -ENOMEM; | |
931 | goto out; | |
932 | } | |
933 | ||
e85d0918 | 934 | usb_fill_bulk_urb(urb, udev, usb_sndbulkpipe(udev, EP_DATA_OUT), |
459c51ad | 935 | skb->data, skb->len, tx_urb_complete, skb); |
e85d0918 DD |
936 | |
937 | r = usb_submit_urb(urb, GFP_ATOMIC); | |
938 | if (r) | |
939 | goto error; | |
459c51ad | 940 | tx_inc_submitted_urbs(usb); |
e85d0918 DD |
941 | return 0; |
942 | error: | |
459c51ad | 943 | free_tx_urb(usb, urb); |
e85d0918 DD |
944 | out: |
945 | return r; | |
946 | } | |
947 | ||
948 | static inline void init_usb_interrupt(struct zd_usb *usb) | |
949 | { | |
950 | struct zd_usb_interrupt *intr = &usb->intr; | |
951 | ||
952 | spin_lock_init(&intr->lock); | |
953 | intr->interval = int_urb_interval(zd_usb_to_usbdev(usb)); | |
954 | init_completion(&intr->read_regs.completion); | |
0ce34bc8 | 955 | intr->read_regs.cr_int_addr = cpu_to_le16((u16)CR_INTERRUPT); |
e85d0918 DD |
956 | } |
957 | ||
958 | static inline void init_usb_rx(struct zd_usb *usb) | |
959 | { | |
960 | struct zd_usb_rx *rx = &usb->rx; | |
961 | spin_lock_init(&rx->lock); | |
962 | if (interface_to_usbdev(usb->intf)->speed == USB_SPEED_HIGH) { | |
963 | rx->usb_packet_size = 512; | |
964 | } else { | |
965 | rx->usb_packet_size = 64; | |
966 | } | |
967 | ZD_ASSERT(rx->fragment_length == 0); | |
968 | } | |
969 | ||
970 | static inline void init_usb_tx(struct zd_usb *usb) | |
971 | { | |
459c51ad DD |
972 | struct zd_usb_tx *tx = &usb->tx; |
973 | spin_lock_init(&tx->lock); | |
974 | tx->enabled = 0; | |
975 | tx->stopped = 0; | |
976 | INIT_LIST_HEAD(&tx->free_urb_list); | |
977 | tx->submitted_urbs = 0; | |
e85d0918 DD |
978 | } |
979 | ||
459c51ad | 980 | void zd_usb_init(struct zd_usb *usb, struct ieee80211_hw *hw, |
e85d0918 DD |
981 | struct usb_interface *intf) |
982 | { | |
983 | memset(usb, 0, sizeof(*usb)); | |
984 | usb->intf = usb_get_intf(intf); | |
459c51ad | 985 | usb_set_intfdata(usb->intf, hw); |
e85d0918 DD |
986 | init_usb_interrupt(usb); |
987 | init_usb_tx(usb); | |
988 | init_usb_rx(usb); | |
989 | } | |
990 | ||
e85d0918 DD |
991 | void zd_usb_clear(struct zd_usb *usb) |
992 | { | |
993 | usb_set_intfdata(usb->intf, NULL); | |
994 | usb_put_intf(usb->intf); | |
c48cf125 | 995 | ZD_MEMCLEAR(usb, sizeof(*usb)); |
e85d0918 DD |
996 | /* FIXME: usb_interrupt, usb_tx, usb_rx? */ |
997 | } | |
998 | ||
999 | static const char *speed(enum usb_device_speed speed) | |
1000 | { | |
1001 | switch (speed) { | |
1002 | case USB_SPEED_LOW: | |
1003 | return "low"; | |
1004 | case USB_SPEED_FULL: | |
1005 | return "full"; | |
1006 | case USB_SPEED_HIGH: | |
1007 | return "high"; | |
1008 | default: | |
1009 | return "unknown speed"; | |
1010 | } | |
1011 | } | |
1012 | ||
1013 | static int scnprint_id(struct usb_device *udev, char *buffer, size_t size) | |
1014 | { | |
1015 | return scnprintf(buffer, size, "%04hx:%04hx v%04hx %s", | |
1016 | le16_to_cpu(udev->descriptor.idVendor), | |
1017 | le16_to_cpu(udev->descriptor.idProduct), | |
1018 | get_bcdDevice(udev), | |
1019 | speed(udev->speed)); | |
1020 | } | |
1021 | ||
1022 | int zd_usb_scnprint_id(struct zd_usb *usb, char *buffer, size_t size) | |
1023 | { | |
1024 | struct usb_device *udev = interface_to_usbdev(usb->intf); | |
1025 | return scnprint_id(udev, buffer, size); | |
1026 | } | |
1027 | ||
1028 | #ifdef DEBUG | |
1029 | static void print_id(struct usb_device *udev) | |
1030 | { | |
1031 | char buffer[40]; | |
1032 | ||
1033 | scnprint_id(udev, buffer, sizeof(buffer)); | |
1034 | buffer[sizeof(buffer)-1] = 0; | |
1035 | dev_dbg_f(&udev->dev, "%s\n", buffer); | |
1036 | } | |
1037 | #else | |
1038 | #define print_id(udev) do { } while (0) | |
1039 | #endif | |
1040 | ||
a1030e92 DD |
1041 | static int eject_installer(struct usb_interface *intf) |
1042 | { | |
1043 | struct usb_device *udev = interface_to_usbdev(intf); | |
1044 | struct usb_host_interface *iface_desc = &intf->altsetting[0]; | |
1045 | struct usb_endpoint_descriptor *endpoint; | |
1046 | unsigned char *cmd; | |
1047 | u8 bulk_out_ep; | |
1048 | int r; | |
1049 | ||
1050 | /* Find bulk out endpoint */ | |
1051 | endpoint = &iface_desc->endpoint[1].desc; | |
1052 | if ((endpoint->bEndpointAddress & USB_TYPE_MASK) == USB_DIR_OUT && | |
1053 | (endpoint->bmAttributes & USB_ENDPOINT_XFERTYPE_MASK) == | |
1054 | USB_ENDPOINT_XFER_BULK) { | |
1055 | bulk_out_ep = endpoint->bEndpointAddress; | |
1056 | } else { | |
1057 | dev_err(&udev->dev, | |
1058 | "zd1211rw: Could not find bulk out endpoint\n"); | |
1059 | return -ENODEV; | |
1060 | } | |
1061 | ||
1062 | cmd = kzalloc(31, GFP_KERNEL); | |
1063 | if (cmd == NULL) | |
1064 | return -ENODEV; | |
1065 | ||
1066 | /* USB bulk command block */ | |
1067 | cmd[0] = 0x55; /* bulk command signature */ | |
1068 | cmd[1] = 0x53; /* bulk command signature */ | |
1069 | cmd[2] = 0x42; /* bulk command signature */ | |
1070 | cmd[3] = 0x43; /* bulk command signature */ | |
1071 | cmd[14] = 6; /* command length */ | |
1072 | ||
1073 | cmd[15] = 0x1b; /* SCSI command: START STOP UNIT */ | |
1074 | cmd[19] = 0x2; /* eject disc */ | |
1075 | ||
1076 | dev_info(&udev->dev, "Ejecting virtual installer media...\n"); | |
1077 | r = usb_bulk_msg(udev, usb_sndbulkpipe(udev, bulk_out_ep), | |
1078 | cmd, 31, NULL, 2000); | |
1079 | kfree(cmd); | |
1080 | if (r) | |
1081 | return r; | |
1082 | ||
1083 | /* At this point, the device disconnects and reconnects with the real | |
1084 | * ID numbers. */ | |
1085 | ||
1086 | usb_set_intfdata(intf, NULL); | |
1087 | return 0; | |
1088 | } | |
1089 | ||
74553aed DD |
1090 | int zd_usb_init_hw(struct zd_usb *usb) |
1091 | { | |
1092 | int r; | |
1093 | struct zd_mac *mac = zd_usb_to_mac(usb); | |
1094 | ||
1095 | dev_dbg_f(zd_usb_dev(usb), "\n"); | |
1096 | ||
1097 | r = upload_firmware(usb); | |
1098 | if (r) { | |
1099 | dev_err(zd_usb_dev(usb), | |
1100 | "couldn't load firmware. Error number %d\n", r); | |
1101 | return r; | |
1102 | } | |
1103 | ||
1104 | r = usb_reset_configuration(zd_usb_to_usbdev(usb)); | |
1105 | if (r) { | |
1106 | dev_dbg_f(zd_usb_dev(usb), | |
1107 | "couldn't reset configuration. Error number %d\n", r); | |
1108 | return r; | |
1109 | } | |
1110 | ||
459c51ad | 1111 | r = zd_mac_init_hw(mac->hw); |
74553aed DD |
1112 | if (r) { |
1113 | dev_dbg_f(zd_usb_dev(usb), | |
1114 | "couldn't initialize mac. Error number %d\n", r); | |
1115 | return r; | |
1116 | } | |
1117 | ||
1118 | usb->initialized = 1; | |
1119 | return 0; | |
1120 | } | |
1121 | ||
e85d0918 DD |
1122 | static int probe(struct usb_interface *intf, const struct usb_device_id *id) |
1123 | { | |
1124 | int r; | |
1125 | struct usb_device *udev = interface_to_usbdev(intf); | |
459c51ad DD |
1126 | struct zd_usb *usb; |
1127 | struct ieee80211_hw *hw = NULL; | |
e85d0918 DD |
1128 | |
1129 | print_id(udev); | |
1130 | ||
a1030e92 DD |
1131 | if (id->driver_info & DEVICE_INSTALLER) |
1132 | return eject_installer(intf); | |
1133 | ||
e85d0918 DD |
1134 | switch (udev->speed) { |
1135 | case USB_SPEED_LOW: | |
1136 | case USB_SPEED_FULL: | |
1137 | case USB_SPEED_HIGH: | |
1138 | break; | |
1139 | default: | |
1140 | dev_dbg_f(&intf->dev, "Unknown USB speed\n"); | |
1141 | r = -ENODEV; | |
1142 | goto error; | |
1143 | } | |
1144 | ||
459c51ad DD |
1145 | r = usb_reset_device(udev); |
1146 | if (r) { | |
1147 | dev_err(&intf->dev, | |
1148 | "couldn't reset usb device. Error number %d\n", r); | |
1149 | goto error; | |
1150 | } | |
6e3632f6 | 1151 | |
459c51ad DD |
1152 | hw = zd_mac_alloc_hw(intf); |
1153 | if (hw == NULL) { | |
e85d0918 DD |
1154 | r = -ENOMEM; |
1155 | goto error; | |
1156 | } | |
1157 | ||
459c51ad | 1158 | usb = &zd_hw_mac(hw)->chip.usb; |
74553aed | 1159 | usb->is_zd1211b = (id->driver_info == DEVICE_ZD1211B) != 0; |
e85d0918 | 1160 | |
459c51ad | 1161 | r = zd_mac_preinit_hw(hw); |
e85d0918 DD |
1162 | if (r) { |
1163 | dev_dbg_f(&intf->dev, | |
1164 | "couldn't initialize mac. Error number %d\n", r); | |
1165 | goto error; | |
1166 | } | |
1167 | ||
459c51ad | 1168 | r = ieee80211_register_hw(hw); |
e85d0918 DD |
1169 | if (r) { |
1170 | dev_dbg_f(&intf->dev, | |
459c51ad | 1171 | "couldn't register device. Error number %d\n", r); |
e85d0918 DD |
1172 | goto error; |
1173 | } | |
1174 | ||
1175 | dev_dbg_f(&intf->dev, "successful\n"); | |
459c51ad | 1176 | dev_info(&intf->dev, "%s\n", wiphy_name(hw->wiphy)); |
e85d0918 DD |
1177 | return 0; |
1178 | error: | |
1179 | usb_reset_device(interface_to_usbdev(intf)); | |
459c51ad DD |
1180 | if (hw) { |
1181 | zd_mac_clear(zd_hw_mac(hw)); | |
1182 | ieee80211_free_hw(hw); | |
1183 | } | |
e85d0918 DD |
1184 | return r; |
1185 | } | |
1186 | ||
1187 | static void disconnect(struct usb_interface *intf) | |
1188 | { | |
459c51ad | 1189 | struct ieee80211_hw *hw = zd_intf_to_hw(intf); |
e0579d57 MP |
1190 | struct zd_mac *mac; |
1191 | struct zd_usb *usb; | |
e85d0918 | 1192 | |
a1030e92 DD |
1193 | /* Either something really bad happened, or we're just dealing with |
1194 | * a DEVICE_INSTALLER. */ | |
459c51ad | 1195 | if (hw == NULL) |
a1030e92 DD |
1196 | return; |
1197 | ||
459c51ad | 1198 | mac = zd_hw_mac(hw); |
e0579d57 MP |
1199 | usb = &mac->chip.usb; |
1200 | ||
e85d0918 DD |
1201 | dev_dbg_f(zd_usb_dev(usb), "\n"); |
1202 | ||
459c51ad | 1203 | ieee80211_unregister_hw(hw); |
e85d0918 DD |
1204 | |
1205 | /* Just in case something has gone wrong! */ | |
1206 | zd_usb_disable_rx(usb); | |
1207 | zd_usb_disable_int(usb); | |
1208 | ||
1209 | /* If the disconnect has been caused by a removal of the | |
1210 | * driver module, the reset allows reloading of the driver. If the | |
1211 | * reset will not be executed here, the upload of the firmware in the | |
1212 | * probe function caused by the reloading of the driver will fail. | |
1213 | */ | |
1214 | usb_reset_device(interface_to_usbdev(intf)); | |
1215 | ||
459c51ad DD |
1216 | zd_mac_clear(mac); |
1217 | ieee80211_free_hw(hw); | |
e85d0918 DD |
1218 | dev_dbg(&intf->dev, "disconnected\n"); |
1219 | } | |
1220 | ||
1221 | static struct usb_driver driver = { | |
459c51ad | 1222 | .name = KBUILD_MODNAME, |
e85d0918 DD |
1223 | .id_table = usb_ids, |
1224 | .probe = probe, | |
1225 | .disconnect = disconnect, | |
1226 | }; | |
1227 | ||
bc5f06a8 UK |
1228 | struct workqueue_struct *zd_workqueue; |
1229 | ||
e85d0918 DD |
1230 | static int __init usb_init(void) |
1231 | { | |
1232 | int r; | |
1233 | ||
741fec53 | 1234 | pr_debug("%s usb_init()\n", driver.name); |
e85d0918 | 1235 | |
bc5f06a8 UK |
1236 | zd_workqueue = create_singlethread_workqueue(driver.name); |
1237 | if (zd_workqueue == NULL) { | |
741fec53 | 1238 | printk(KERN_ERR "%s couldn't create workqueue\n", driver.name); |
bc5f06a8 UK |
1239 | return -ENOMEM; |
1240 | } | |
1241 | ||
e85d0918 DD |
1242 | r = usb_register(&driver); |
1243 | if (r) { | |
192b775c | 1244 | destroy_workqueue(zd_workqueue); |
741fec53 UK |
1245 | printk(KERN_ERR "%s usb_register() failed. Error number %d\n", |
1246 | driver.name, r); | |
e85d0918 DD |
1247 | return r; |
1248 | } | |
1249 | ||
741fec53 | 1250 | pr_debug("%s initialized\n", driver.name); |
e85d0918 DD |
1251 | return 0; |
1252 | } | |
1253 | ||
1254 | static void __exit usb_exit(void) | |
1255 | { | |
741fec53 | 1256 | pr_debug("%s usb_exit()\n", driver.name); |
e85d0918 | 1257 | usb_deregister(&driver); |
bc5f06a8 | 1258 | destroy_workqueue(zd_workqueue); |
e85d0918 DD |
1259 | } |
1260 | ||
1261 | module_init(usb_init); | |
1262 | module_exit(usb_exit); | |
1263 | ||
1264 | static int usb_int_regs_length(unsigned int count) | |
1265 | { | |
1266 | return sizeof(struct usb_int_regs) + count * sizeof(struct reg_data); | |
1267 | } | |
1268 | ||
1269 | static void prepare_read_regs_int(struct zd_usb *usb) | |
1270 | { | |
1271 | struct zd_usb_interrupt *intr = &usb->intr; | |
1272 | ||
a68077de | 1273 | spin_lock_irq(&intr->lock); |
e85d0918 DD |
1274 | intr->read_regs_enabled = 1; |
1275 | INIT_COMPLETION(intr->read_regs.completion); | |
a68077de UK |
1276 | spin_unlock_irq(&intr->lock); |
1277 | } | |
1278 | ||
1279 | static void disable_read_regs_int(struct zd_usb *usb) | |
1280 | { | |
1281 | struct zd_usb_interrupt *intr = &usb->intr; | |
1282 | ||
1283 | spin_lock_irq(&intr->lock); | |
1284 | intr->read_regs_enabled = 0; | |
1285 | spin_unlock_irq(&intr->lock); | |
e85d0918 DD |
1286 | } |
1287 | ||
1288 | static int get_results(struct zd_usb *usb, u16 *values, | |
1289 | struct usb_req_read_regs *req, unsigned int count) | |
1290 | { | |
1291 | int r; | |
1292 | int i; | |
1293 | struct zd_usb_interrupt *intr = &usb->intr; | |
1294 | struct read_regs_int *rr = &intr->read_regs; | |
1295 | struct usb_int_regs *regs = (struct usb_int_regs *)rr->buffer; | |
1296 | ||
a68077de | 1297 | spin_lock_irq(&intr->lock); |
e85d0918 DD |
1298 | |
1299 | r = -EIO; | |
1300 | /* The created block size seems to be larger than expected. | |
1301 | * However results appear to be correct. | |
1302 | */ | |
1303 | if (rr->length < usb_int_regs_length(count)) { | |
1304 | dev_dbg_f(zd_usb_dev(usb), | |
1305 | "error: actual length %d less than expected %d\n", | |
1306 | rr->length, usb_int_regs_length(count)); | |
1307 | goto error_unlock; | |
1308 | } | |
1309 | if (rr->length > sizeof(rr->buffer)) { | |
1310 | dev_dbg_f(zd_usb_dev(usb), | |
1311 | "error: actual length %d exceeds buffer size %zu\n", | |
1312 | rr->length, sizeof(rr->buffer)); | |
1313 | goto error_unlock; | |
1314 | } | |
1315 | ||
1316 | for (i = 0; i < count; i++) { | |
1317 | struct reg_data *rd = ®s->regs[i]; | |
1318 | if (rd->addr != req->addr[i]) { | |
1319 | dev_dbg_f(zd_usb_dev(usb), | |
1320 | "rd[%d] addr %#06hx expected %#06hx\n", i, | |
1321 | le16_to_cpu(rd->addr), | |
1322 | le16_to_cpu(req->addr[i])); | |
1323 | goto error_unlock; | |
1324 | } | |
1325 | values[i] = le16_to_cpu(rd->value); | |
1326 | } | |
1327 | ||
1328 | r = 0; | |
1329 | error_unlock: | |
a68077de | 1330 | spin_unlock_irq(&intr->lock); |
e85d0918 DD |
1331 | return r; |
1332 | } | |
1333 | ||
1334 | int zd_usb_ioread16v(struct zd_usb *usb, u16 *values, | |
1335 | const zd_addr_t *addresses, unsigned int count) | |
1336 | { | |
1337 | int r; | |
1338 | int i, req_len, actual_req_len; | |
1339 | struct usb_device *udev; | |
1340 | struct usb_req_read_regs *req = NULL; | |
1341 | unsigned long timeout; | |
1342 | ||
1343 | if (count < 1) { | |
1344 | dev_dbg_f(zd_usb_dev(usb), "error: count is zero\n"); | |
1345 | return -EINVAL; | |
1346 | } | |
1347 | if (count > USB_MAX_IOREAD16_COUNT) { | |
1348 | dev_dbg_f(zd_usb_dev(usb), | |
1349 | "error: count %u exceeds possible max %u\n", | |
1350 | count, USB_MAX_IOREAD16_COUNT); | |
1351 | return -EINVAL; | |
1352 | } | |
1353 | if (in_atomic()) { | |
1354 | dev_dbg_f(zd_usb_dev(usb), | |
1355 | "error: io in atomic context not supported\n"); | |
1356 | return -EWOULDBLOCK; | |
1357 | } | |
1358 | if (!usb_int_enabled(usb)) { | |
1359 | dev_dbg_f(zd_usb_dev(usb), | |
1360 | "error: usb interrupt not enabled\n"); | |
1361 | return -EWOULDBLOCK; | |
1362 | } | |
1363 | ||
1364 | req_len = sizeof(struct usb_req_read_regs) + count * sizeof(__le16); | |
35c3404e | 1365 | req = kmalloc(req_len, GFP_KERNEL); |
e85d0918 DD |
1366 | if (!req) |
1367 | return -ENOMEM; | |
1368 | req->id = cpu_to_le16(USB_REQ_READ_REGS); | |
1369 | for (i = 0; i < count; i++) | |
0ce34bc8 | 1370 | req->addr[i] = cpu_to_le16((u16)addresses[i]); |
e85d0918 DD |
1371 | |
1372 | udev = zd_usb_to_usbdev(usb); | |
1373 | prepare_read_regs_int(usb); | |
1374 | r = usb_bulk_msg(udev, usb_sndbulkpipe(udev, EP_REGS_OUT), | |
1375 | req, req_len, &actual_req_len, 1000 /* ms */); | |
1376 | if (r) { | |
1377 | dev_dbg_f(zd_usb_dev(usb), | |
1378 | "error in usb_bulk_msg(). Error number %d\n", r); | |
1379 | goto error; | |
1380 | } | |
1381 | if (req_len != actual_req_len) { | |
1382 | dev_dbg_f(zd_usb_dev(usb), "error in usb_bulk_msg()\n" | |
1383 | " req_len %d != actual_req_len %d\n", | |
1384 | req_len, actual_req_len); | |
1385 | r = -EIO; | |
1386 | goto error; | |
1387 | } | |
1388 | ||
1389 | timeout = wait_for_completion_timeout(&usb->intr.read_regs.completion, | |
1390 | msecs_to_jiffies(1000)); | |
1391 | if (!timeout) { | |
1392 | disable_read_regs_int(usb); | |
1393 | dev_dbg_f(zd_usb_dev(usb), "read timed out\n"); | |
1394 | r = -ETIMEDOUT; | |
1395 | goto error; | |
1396 | } | |
1397 | ||
1398 | r = get_results(usb, values, req, count); | |
1399 | error: | |
1400 | kfree(req); | |
1401 | return r; | |
1402 | } | |
1403 | ||
1404 | int zd_usb_iowrite16v(struct zd_usb *usb, const struct zd_ioreq16 *ioreqs, | |
1405 | unsigned int count) | |
1406 | { | |
1407 | int r; | |
1408 | struct usb_device *udev; | |
1409 | struct usb_req_write_regs *req = NULL; | |
1410 | int i, req_len, actual_req_len; | |
1411 | ||
1412 | if (count == 0) | |
1413 | return 0; | |
1414 | if (count > USB_MAX_IOWRITE16_COUNT) { | |
1415 | dev_dbg_f(zd_usb_dev(usb), | |
1416 | "error: count %u exceeds possible max %u\n", | |
1417 | count, USB_MAX_IOWRITE16_COUNT); | |
1418 | return -EINVAL; | |
1419 | } | |
1420 | if (in_atomic()) { | |
1421 | dev_dbg_f(zd_usb_dev(usb), | |
1422 | "error: io in atomic context not supported\n"); | |
1423 | return -EWOULDBLOCK; | |
1424 | } | |
1425 | ||
1426 | req_len = sizeof(struct usb_req_write_regs) + | |
1427 | count * sizeof(struct reg_data); | |
35c3404e | 1428 | req = kmalloc(req_len, GFP_KERNEL); |
e85d0918 DD |
1429 | if (!req) |
1430 | return -ENOMEM; | |
1431 | ||
1432 | req->id = cpu_to_le16(USB_REQ_WRITE_REGS); | |
1433 | for (i = 0; i < count; i++) { | |
1434 | struct reg_data *rw = &req->reg_writes[i]; | |
0ce34bc8 | 1435 | rw->addr = cpu_to_le16((u16)ioreqs[i].addr); |
e85d0918 DD |
1436 | rw->value = cpu_to_le16(ioreqs[i].value); |
1437 | } | |
1438 | ||
1439 | udev = zd_usb_to_usbdev(usb); | |
1440 | r = usb_bulk_msg(udev, usb_sndbulkpipe(udev, EP_REGS_OUT), | |
1441 | req, req_len, &actual_req_len, 1000 /* ms */); | |
1442 | if (r) { | |
1443 | dev_dbg_f(zd_usb_dev(usb), | |
1444 | "error in usb_bulk_msg(). Error number %d\n", r); | |
1445 | goto error; | |
1446 | } | |
1447 | if (req_len != actual_req_len) { | |
1448 | dev_dbg_f(zd_usb_dev(usb), | |
1449 | "error in usb_bulk_msg()" | |
1450 | " req_len %d != actual_req_len %d\n", | |
1451 | req_len, actual_req_len); | |
1452 | r = -EIO; | |
1453 | goto error; | |
1454 | } | |
1455 | ||
1456 | /* FALL-THROUGH with r == 0 */ | |
1457 | error: | |
1458 | kfree(req); | |
1459 | return r; | |
1460 | } | |
1461 | ||
1462 | int zd_usb_rfwrite(struct zd_usb *usb, u32 value, u8 bits) | |
1463 | { | |
1464 | int r; | |
1465 | struct usb_device *udev; | |
1466 | struct usb_req_rfwrite *req = NULL; | |
1467 | int i, req_len, actual_req_len; | |
1468 | u16 bit_value_template; | |
1469 | ||
1470 | if (in_atomic()) { | |
1471 | dev_dbg_f(zd_usb_dev(usb), | |
1472 | "error: io in atomic context not supported\n"); | |
1473 | return -EWOULDBLOCK; | |
1474 | } | |
1475 | if (bits < USB_MIN_RFWRITE_BIT_COUNT) { | |
1476 | dev_dbg_f(zd_usb_dev(usb), | |
1477 | "error: bits %d are smaller than" | |
1478 | " USB_MIN_RFWRITE_BIT_COUNT %d\n", | |
1479 | bits, USB_MIN_RFWRITE_BIT_COUNT); | |
1480 | return -EINVAL; | |
1481 | } | |
1482 | if (bits > USB_MAX_RFWRITE_BIT_COUNT) { | |
1483 | dev_dbg_f(zd_usb_dev(usb), | |
1484 | "error: bits %d exceed USB_MAX_RFWRITE_BIT_COUNT %d\n", | |
1485 | bits, USB_MAX_RFWRITE_BIT_COUNT); | |
1486 | return -EINVAL; | |
1487 | } | |
1488 | #ifdef DEBUG | |
1489 | if (value & (~0UL << bits)) { | |
1490 | dev_dbg_f(zd_usb_dev(usb), | |
1491 | "error: value %#09x has bits >= %d set\n", | |
1492 | value, bits); | |
1493 | return -EINVAL; | |
1494 | } | |
1495 | #endif /* DEBUG */ | |
1496 | ||
1497 | dev_dbg_f(zd_usb_dev(usb), "value %#09x bits %d\n", value, bits); | |
1498 | ||
1499 | r = zd_usb_ioread16(usb, &bit_value_template, CR203); | |
1500 | if (r) { | |
1501 | dev_dbg_f(zd_usb_dev(usb), | |
1502 | "error %d: Couldn't read CR203\n", r); | |
1503 | goto out; | |
1504 | } | |
1505 | bit_value_template &= ~(RF_IF_LE|RF_CLK|RF_DATA); | |
1506 | ||
1507 | req_len = sizeof(struct usb_req_rfwrite) + bits * sizeof(__le16); | |
35c3404e | 1508 | req = kmalloc(req_len, GFP_KERNEL); |
e85d0918 DD |
1509 | if (!req) |
1510 | return -ENOMEM; | |
1511 | ||
1512 | req->id = cpu_to_le16(USB_REQ_WRITE_RF); | |
1513 | /* 1: 3683a, but not used in ZYDAS driver */ | |
1514 | req->value = cpu_to_le16(2); | |
1515 | req->bits = cpu_to_le16(bits); | |
1516 | ||
1517 | for (i = 0; i < bits; i++) { | |
1518 | u16 bv = bit_value_template; | |
1519 | if (value & (1 << (bits-1-i))) | |
1520 | bv |= RF_DATA; | |
1521 | req->bit_values[i] = cpu_to_le16(bv); | |
1522 | } | |
1523 | ||
1524 | udev = zd_usb_to_usbdev(usb); | |
1525 | r = usb_bulk_msg(udev, usb_sndbulkpipe(udev, EP_REGS_OUT), | |
1526 | req, req_len, &actual_req_len, 1000 /* ms */); | |
1527 | if (r) { | |
1528 | dev_dbg_f(zd_usb_dev(usb), | |
1529 | "error in usb_bulk_msg(). Error number %d\n", r); | |
1530 | goto out; | |
1531 | } | |
1532 | if (req_len != actual_req_len) { | |
1533 | dev_dbg_f(zd_usb_dev(usb), "error in usb_bulk_msg()" | |
1534 | " req_len %d != actual_req_len %d\n", | |
1535 | req_len, actual_req_len); | |
1536 | r = -EIO; | |
1537 | goto out; | |
1538 | } | |
1539 | ||
1540 | /* FALL-THROUGH with r == 0 */ | |
1541 | out: | |
1542 | kfree(req); | |
1543 | return r; | |
1544 | } |