Commit | Line | Data |
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5fd54ace | 1 | // SPDX-License-Identifier: GPL-2.0 |
946b960d GKH |
2 | /* |
3 | * Native support for the I/O-Warrior USB devices | |
4 | * | |
5 | * Copyright (c) 2003-2005 Code Mercenaries GmbH | |
6 | * written by Christian Lucht <lucht@codemercs.com> | |
7 | * | |
8 | * based on | |
9 | ||
10 | * usb-skeleton.c by Greg Kroah-Hartman <greg@kroah.com> | |
11 | * brlvger.c by Stephane Dalton <sdalton@videotron.ca> | |
12 | * and St�hane Doyon <s.doyon@videotron.ca> | |
13 | * | |
14 | * Released under the GPLv2. | |
15 | */ | |
16 | ||
17 | #include <linux/module.h> | |
18 | #include <linux/usb.h> | |
946b960d GKH |
19 | #include <linux/slab.h> |
20 | #include <linux/sched.h> | |
925ce689 | 21 | #include <linux/mutex.h> |
946b960d | 22 | #include <linux/poll.h> |
946b960d GKH |
23 | #include <linux/usb/iowarrior.h> |
24 | ||
946b960d | 25 | #define DRIVER_AUTHOR "Christian Lucht <lucht@codemercs.com>" |
c35c376f | 26 | #define DRIVER_DESC "USB IO-Warrior driver" |
946b960d GKH |
27 | |
28 | #define USB_VENDOR_ID_CODEMERCS 1984 | |
29 | /* low speed iowarrior */ | |
30 | #define USB_DEVICE_ID_CODEMERCS_IOW40 0x1500 | |
31 | #define USB_DEVICE_ID_CODEMERCS_IOW24 0x1501 | |
32 | #define USB_DEVICE_ID_CODEMERCS_IOWPV1 0x1511 | |
33 | #define USB_DEVICE_ID_CODEMERCS_IOWPV2 0x1512 | |
34 | /* full speed iowarrior */ | |
35 | #define USB_DEVICE_ID_CODEMERCS_IOW56 0x1503 | |
36 | ||
37 | /* Get a minor range for your devices from the usb maintainer */ | |
38 | #ifdef CONFIG_USB_DYNAMIC_MINORS | |
39 | #define IOWARRIOR_MINOR_BASE 0 | |
40 | #else | |
25985edc | 41 | #define IOWARRIOR_MINOR_BASE 208 // SKELETON_MINOR_BASE 192 + 16, not official yet |
946b960d GKH |
42 | #endif |
43 | ||
44 | /* interrupt input queue size */ | |
45 | #define MAX_INTERRUPT_BUFFER 16 | |
46 | /* | |
47 | maximum number of urbs that are submitted for writes at the same time, | |
48 | this applies to the IOWarrior56 only! | |
49 | IOWarrior24 and IOWarrior40 use synchronous usb_control_msg calls. | |
50 | */ | |
51 | #define MAX_WRITES_IN_FLIGHT 4 | |
52 | ||
946b960d GKH |
53 | MODULE_AUTHOR(DRIVER_AUTHOR); |
54 | MODULE_DESCRIPTION(DRIVER_DESC); | |
55 | MODULE_LICENSE("GPL"); | |
56 | ||
57 | /* Module parameters */ | |
925ce689 | 58 | static DEFINE_MUTEX(iowarrior_mutex); |
946b960d GKH |
59 | |
60 | static struct usb_driver iowarrior_driver; | |
03f36e88 | 61 | static DEFINE_MUTEX(iowarrior_open_disc_lock); |
946b960d GKH |
62 | |
63 | /*--------------*/ | |
64 | /* data */ | |
65 | /*--------------*/ | |
66 | ||
67 | /* Structure to hold all of our device specific stuff */ | |
68 | struct iowarrior { | |
69 | struct mutex mutex; /* locks this structure */ | |
70 | struct usb_device *udev; /* save off the usb device pointer */ | |
71 | struct usb_interface *interface; /* the interface for this device */ | |
72 | unsigned char minor; /* the starting minor number for this device */ | |
73 | struct usb_endpoint_descriptor *int_out_endpoint; /* endpoint for reading (needed for IOW56 only) */ | |
74 | struct usb_endpoint_descriptor *int_in_endpoint; /* endpoint for reading */ | |
75 | struct urb *int_in_urb; /* the urb for reading data */ | |
76 | unsigned char *int_in_buffer; /* buffer for data to be read */ | |
77 | unsigned char serial_number; /* to detect lost packages */ | |
78 | unsigned char *read_queue; /* size is MAX_INTERRUPT_BUFFER * packet size */ | |
79 | wait_queue_head_t read_wait; | |
80 | wait_queue_head_t write_wait; /* wait-queue for writing to the device */ | |
81 | atomic_t write_busy; /* number of write-urbs submitted */ | |
82 | atomic_t read_idx; | |
83 | atomic_t intr_idx; | |
946b960d GKH |
84 | atomic_t overflow_flag; /* signals an index 'rollover' */ |
85 | int present; /* this is 1 as long as the device is connected */ | |
86 | int opened; /* this is 1 if the device is currently open */ | |
87 | char chip_serial[9]; /* the serial number string of the chip connected */ | |
88 | int report_size; /* number of bytes in a report */ | |
89 | u16 product_id; | |
b5f8d468 | 90 | struct usb_anchor submitted; |
946b960d GKH |
91 | }; |
92 | ||
93 | /*--------------*/ | |
94 | /* globals */ | |
95 | /*--------------*/ | |
946b960d GKH |
96 | |
97 | /* | |
98 | * USB spec identifies 5 second timeouts. | |
99 | */ | |
100 | #define GET_TIMEOUT 5 | |
101 | #define USB_REQ_GET_REPORT 0x01 | |
102 | //#if 0 | |
103 | static int usb_get_report(struct usb_device *dev, | |
104 | struct usb_host_interface *inter, unsigned char type, | |
105 | unsigned char id, void *buf, int size) | |
106 | { | |
107 | return usb_control_msg(dev, usb_rcvctrlpipe(dev, 0), | |
108 | USB_REQ_GET_REPORT, | |
109 | USB_DIR_IN | USB_TYPE_CLASS | | |
110 | USB_RECIP_INTERFACE, (type << 8) + id, | |
111 | inter->desc.bInterfaceNumber, buf, size, | |
147c5a17 | 112 | GET_TIMEOUT*HZ); |
946b960d GKH |
113 | } |
114 | //#endif | |
115 | ||
116 | #define USB_REQ_SET_REPORT 0x09 | |
117 | ||
118 | static int usb_set_report(struct usb_interface *intf, unsigned char type, | |
119 | unsigned char id, void *buf, int size) | |
120 | { | |
121 | return usb_control_msg(interface_to_usbdev(intf), | |
122 | usb_sndctrlpipe(interface_to_usbdev(intf), 0), | |
123 | USB_REQ_SET_REPORT, | |
124 | USB_TYPE_CLASS | USB_RECIP_INTERFACE, | |
125 | (type << 8) + id, | |
126 | intf->cur_altsetting->desc.bInterfaceNumber, buf, | |
147c5a17 | 127 | size, HZ); |
946b960d GKH |
128 | } |
129 | ||
130 | /*---------------------*/ | |
131 | /* driver registration */ | |
132 | /*---------------------*/ | |
133 | /* table of devices that work with this driver */ | |
33b9e162 | 134 | static const struct usb_device_id iowarrior_ids[] = { |
946b960d GKH |
135 | {USB_DEVICE(USB_VENDOR_ID_CODEMERCS, USB_DEVICE_ID_CODEMERCS_IOW40)}, |
136 | {USB_DEVICE(USB_VENDOR_ID_CODEMERCS, USB_DEVICE_ID_CODEMERCS_IOW24)}, | |
137 | {USB_DEVICE(USB_VENDOR_ID_CODEMERCS, USB_DEVICE_ID_CODEMERCS_IOWPV1)}, | |
138 | {USB_DEVICE(USB_VENDOR_ID_CODEMERCS, USB_DEVICE_ID_CODEMERCS_IOWPV2)}, | |
139 | {USB_DEVICE(USB_VENDOR_ID_CODEMERCS, USB_DEVICE_ID_CODEMERCS_IOW56)}, | |
140 | {} /* Terminating entry */ | |
141 | }; | |
142 | MODULE_DEVICE_TABLE(usb, iowarrior_ids); | |
143 | ||
144 | /* | |
145 | * USB callback handler for reading data | |
146 | */ | |
147 | static void iowarrior_callback(struct urb *urb) | |
148 | { | |
cdc97792 | 149 | struct iowarrior *dev = urb->context; |
946b960d GKH |
150 | int intr_idx; |
151 | int read_idx; | |
152 | int aux_idx; | |
153 | int offset; | |
fb3abee6 GKH |
154 | int status = urb->status; |
155 | int retval; | |
946b960d | 156 | |
fb3abee6 | 157 | switch (status) { |
946b960d GKH |
158 | case 0: |
159 | /* success */ | |
160 | break; | |
161 | case -ECONNRESET: | |
162 | case -ENOENT: | |
163 | case -ESHUTDOWN: | |
164 | return; | |
165 | default: | |
166 | goto exit; | |
167 | } | |
168 | ||
946b960d GKH |
169 | intr_idx = atomic_read(&dev->intr_idx); |
170 | /* aux_idx become previous intr_idx */ | |
171 | aux_idx = (intr_idx == 0) ? (MAX_INTERRUPT_BUFFER - 1) : (intr_idx - 1); | |
172 | read_idx = atomic_read(&dev->read_idx); | |
173 | ||
174 | /* queue is not empty and it's interface 0 */ | |
175 | if ((intr_idx != read_idx) | |
176 | && (dev->interface->cur_altsetting->desc.bInterfaceNumber == 0)) { | |
177 | /* + 1 for serial number */ | |
178 | offset = aux_idx * (dev->report_size + 1); | |
179 | if (!memcmp | |
180 | (dev->read_queue + offset, urb->transfer_buffer, | |
181 | dev->report_size)) { | |
182 | /* equal values on interface 0 will be ignored */ | |
946b960d GKH |
183 | goto exit; |
184 | } | |
185 | } | |
186 | ||
187 | /* aux_idx become next intr_idx */ | |
188 | aux_idx = (intr_idx == (MAX_INTERRUPT_BUFFER - 1)) ? 0 : (intr_idx + 1); | |
189 | if (read_idx == aux_idx) { | |
190 | /* queue full, dropping oldest input */ | |
191 | read_idx = (++read_idx == MAX_INTERRUPT_BUFFER) ? 0 : read_idx; | |
192 | atomic_set(&dev->read_idx, read_idx); | |
193 | atomic_set(&dev->overflow_flag, 1); | |
194 | } | |
195 | ||
196 | /* +1 for serial number */ | |
197 | offset = intr_idx * (dev->report_size + 1); | |
198 | memcpy(dev->read_queue + offset, urb->transfer_buffer, | |
199 | dev->report_size); | |
200 | *(dev->read_queue + offset + (dev->report_size)) = dev->serial_number++; | |
201 | ||
202 | atomic_set(&dev->intr_idx, aux_idx); | |
946b960d GKH |
203 | /* tell the blocking read about the new data */ |
204 | wake_up_interruptible(&dev->read_wait); | |
205 | ||
206 | exit: | |
fb3abee6 GKH |
207 | retval = usb_submit_urb(urb, GFP_ATOMIC); |
208 | if (retval) | |
898eb71c | 209 | dev_err(&dev->interface->dev, "%s - usb_submit_urb failed with result %d\n", |
441b62c1 | 210 | __func__, retval); |
946b960d GKH |
211 | |
212 | } | |
213 | ||
214 | /* | |
215 | * USB Callback handler for write-ops | |
216 | */ | |
217 | static void iowarrior_write_callback(struct urb *urb) | |
218 | { | |
219 | struct iowarrior *dev; | |
fb3abee6 GKH |
220 | int status = urb->status; |
221 | ||
cdc97792 | 222 | dev = urb->context; |
946b960d | 223 | /* sync/async unlink faults aren't errors */ |
fb3abee6 GKH |
224 | if (status && |
225 | !(status == -ENOENT || | |
226 | status == -ECONNRESET || status == -ESHUTDOWN)) { | |
549e8350 JP |
227 | dev_dbg(&dev->interface->dev, |
228 | "nonzero write bulk status received: %d\n", status); | |
946b960d GKH |
229 | } |
230 | /* free up our allocated buffer */ | |
997ea58e DM |
231 | usb_free_coherent(urb->dev, urb->transfer_buffer_length, |
232 | urb->transfer_buffer, urb->transfer_dma); | |
946b960d GKH |
233 | /* tell a waiting writer the interrupt-out-pipe is available again */ |
234 | atomic_dec(&dev->write_busy); | |
235 | wake_up_interruptible(&dev->write_wait); | |
236 | } | |
237 | ||
238 | /** | |
239 | * iowarrior_delete | |
240 | */ | |
241 | static inline void iowarrior_delete(struct iowarrior *dev) | |
242 | { | |
549e8350 | 243 | dev_dbg(&dev->interface->dev, "minor %d\n", dev->minor); |
946b960d GKH |
244 | kfree(dev->int_in_buffer); |
245 | usb_free_urb(dev->int_in_urb); | |
246 | kfree(dev->read_queue); | |
80cd5479 | 247 | usb_put_intf(dev->interface); |
946b960d GKH |
248 | kfree(dev); |
249 | } | |
250 | ||
251 | /*---------------------*/ | |
252 | /* fops implementation */ | |
253 | /*---------------------*/ | |
254 | ||
255 | static int read_index(struct iowarrior *dev) | |
256 | { | |
257 | int intr_idx, read_idx; | |
258 | ||
259 | read_idx = atomic_read(&dev->read_idx); | |
260 | intr_idx = atomic_read(&dev->intr_idx); | |
261 | ||
262 | return (read_idx == intr_idx ? -1 : read_idx); | |
263 | } | |
264 | ||
265 | /** | |
266 | * iowarrior_read | |
267 | */ | |
268 | static ssize_t iowarrior_read(struct file *file, char __user *buffer, | |
269 | size_t count, loff_t *ppos) | |
270 | { | |
271 | struct iowarrior *dev; | |
272 | int read_idx; | |
273 | int offset; | |
274 | ||
5bd6e8b3 | 275 | dev = file->private_data; |
946b960d GKH |
276 | |
277 | /* verify that the device wasn't unplugged */ | |
3cfb4842 | 278 | if (!dev || !dev->present) |
946b960d GKH |
279 | return -ENODEV; |
280 | ||
549e8350 JP |
281 | dev_dbg(&dev->interface->dev, "minor %d, count = %zd\n", |
282 | dev->minor, count); | |
946b960d GKH |
283 | |
284 | /* read count must be packet size (+ time stamp) */ | |
285 | if ((count != dev->report_size) | |
286 | && (count != (dev->report_size + 1))) | |
287 | return -EINVAL; | |
288 | ||
289 | /* repeat until no buffer overrun in callback handler occur */ | |
290 | do { | |
291 | atomic_set(&dev->overflow_flag, 0); | |
292 | if ((read_idx = read_index(dev)) == -1) { | |
f38f1418 | 293 | /* queue empty */ |
946b960d GKH |
294 | if (file->f_flags & O_NONBLOCK) |
295 | return -EAGAIN; | |
296 | else { | |
297 | //next line will return when there is either new data, or the device is unplugged | |
298 | int r = wait_event_interruptible(dev->read_wait, | |
299 | (!dev->present | |
300 | || (read_idx = | |
301 | read_index | |
302 | (dev)) != | |
303 | -1)); | |
304 | if (r) { | |
305 | //we were interrupted by a signal | |
306 | return -ERESTART; | |
307 | } | |
308 | if (!dev->present) { | |
309 | //The device was unplugged | |
310 | return -ENODEV; | |
311 | } | |
312 | if (read_idx == -1) { | |
313 | // Can this happen ??? | |
314 | return 0; | |
315 | } | |
316 | } | |
317 | } | |
318 | ||
319 | offset = read_idx * (dev->report_size + 1); | |
320 | if (copy_to_user(buffer, dev->read_queue + offset, count)) { | |
321 | return -EFAULT; | |
322 | } | |
323 | } while (atomic_read(&dev->overflow_flag)); | |
324 | ||
325 | read_idx = ++read_idx == MAX_INTERRUPT_BUFFER ? 0 : read_idx; | |
326 | atomic_set(&dev->read_idx, read_idx); | |
327 | return count; | |
328 | } | |
329 | ||
330 | /* | |
331 | * iowarrior_write | |
332 | */ | |
333 | static ssize_t iowarrior_write(struct file *file, | |
334 | const char __user *user_buffer, | |
335 | size_t count, loff_t *ppos) | |
336 | { | |
337 | struct iowarrior *dev; | |
338 | int retval = 0; | |
339 | char *buf = NULL; /* for IOW24 and IOW56 we need a buffer */ | |
340 | struct urb *int_out_urb = NULL; | |
341 | ||
5bd6e8b3 | 342 | dev = file->private_data; |
946b960d GKH |
343 | |
344 | mutex_lock(&dev->mutex); | |
345 | /* verify that the device wasn't unplugged */ | |
e28c6a77 | 346 | if (!dev->present) { |
946b960d GKH |
347 | retval = -ENODEV; |
348 | goto exit; | |
349 | } | |
549e8350 JP |
350 | dev_dbg(&dev->interface->dev, "minor %d, count = %zd\n", |
351 | dev->minor, count); | |
946b960d GKH |
352 | /* if count is 0 we're already done */ |
353 | if (count == 0) { | |
354 | retval = 0; | |
355 | goto exit; | |
356 | } | |
357 | /* We only accept full reports */ | |
358 | if (count != dev->report_size) { | |
359 | retval = -EINVAL; | |
360 | goto exit; | |
361 | } | |
362 | switch (dev->product_id) { | |
363 | case USB_DEVICE_ID_CODEMERCS_IOW24: | |
364 | case USB_DEVICE_ID_CODEMERCS_IOWPV1: | |
365 | case USB_DEVICE_ID_CODEMERCS_IOWPV2: | |
366 | case USB_DEVICE_ID_CODEMERCS_IOW40: | |
367 | /* IOW24 and IOW40 use a synchronous call */ | |
ca2ef0d5 GT |
368 | buf = memdup_user(user_buffer, count); |
369 | if (IS_ERR(buf)) { | |
370 | retval = PTR_ERR(buf); | |
946b960d GKH |
371 | goto exit; |
372 | } | |
373 | retval = usb_set_report(dev->interface, 2, 0, buf, count); | |
374 | kfree(buf); | |
375 | goto exit; | |
376 | break; | |
377 | case USB_DEVICE_ID_CODEMERCS_IOW56: | |
378 | /* The IOW56 uses asynchronous IO and more urbs */ | |
379 | if (atomic_read(&dev->write_busy) == MAX_WRITES_IN_FLIGHT) { | |
380 | /* Wait until we are below the limit for submitted urbs */ | |
381 | if (file->f_flags & O_NONBLOCK) { | |
382 | retval = -EAGAIN; | |
383 | goto exit; | |
384 | } else { | |
385 | retval = wait_event_interruptible(dev->write_wait, | |
386 | (!dev->present || (atomic_read (&dev-> write_busy) < MAX_WRITES_IN_FLIGHT))); | |
387 | if (retval) { | |
388 | /* we were interrupted by a signal */ | |
389 | retval = -ERESTART; | |
390 | goto exit; | |
391 | } | |
392 | if (!dev->present) { | |
393 | /* The device was unplugged */ | |
394 | retval = -ENODEV; | |
395 | goto exit; | |
396 | } | |
397 | if (!dev->opened) { | |
398 | /* We were closed while waiting for an URB */ | |
399 | retval = -ENODEV; | |
400 | goto exit; | |
401 | } | |
402 | } | |
403 | } | |
404 | atomic_inc(&dev->write_busy); | |
405 | int_out_urb = usb_alloc_urb(0, GFP_KERNEL); | |
406 | if (!int_out_urb) { | |
407 | retval = -ENOMEM; | |
f81ee4d5 | 408 | goto error_no_urb; |
946b960d | 409 | } |
997ea58e DM |
410 | buf = usb_alloc_coherent(dev->udev, dev->report_size, |
411 | GFP_KERNEL, &int_out_urb->transfer_dma); | |
946b960d GKH |
412 | if (!buf) { |
413 | retval = -ENOMEM; | |
549e8350 JP |
414 | dev_dbg(&dev->interface->dev, |
415 | "Unable to allocate buffer\n"); | |
f81ee4d5 | 416 | goto error_no_buffer; |
946b960d GKH |
417 | } |
418 | usb_fill_int_urb(int_out_urb, dev->udev, | |
419 | usb_sndintpipe(dev->udev, | |
420 | dev->int_out_endpoint->bEndpointAddress), | |
421 | buf, dev->report_size, | |
422 | iowarrior_write_callback, dev, | |
423 | dev->int_out_endpoint->bInterval); | |
424 | int_out_urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP; | |
425 | if (copy_from_user(buf, user_buffer, count)) { | |
426 | retval = -EFAULT; | |
427 | goto error; | |
428 | } | |
b5f8d468 | 429 | usb_anchor_urb(int_out_urb, &dev->submitted); |
946b960d GKH |
430 | retval = usb_submit_urb(int_out_urb, GFP_KERNEL); |
431 | if (retval) { | |
549e8350 JP |
432 | dev_dbg(&dev->interface->dev, |
433 | "submit error %d for urb nr.%d\n", | |
434 | retval, atomic_read(&dev->write_busy)); | |
b5f8d468 | 435 | usb_unanchor_urb(int_out_urb); |
946b960d GKH |
436 | goto error; |
437 | } | |
438 | /* submit was ok */ | |
439 | retval = count; | |
440 | usb_free_urb(int_out_urb); | |
441 | goto exit; | |
442 | break; | |
443 | default: | |
444 | /* what do we have here ? An unsupported Product-ID ? */ | |
898eb71c | 445 | dev_err(&dev->interface->dev, "%s - not supported for product=0x%x\n", |
441b62c1 | 446 | __func__, dev->product_id); |
946b960d GKH |
447 | retval = -EFAULT; |
448 | goto exit; | |
449 | break; | |
450 | } | |
451 | error: | |
997ea58e DM |
452 | usb_free_coherent(dev->udev, dev->report_size, buf, |
453 | int_out_urb->transfer_dma); | |
f81ee4d5 | 454 | error_no_buffer: |
946b960d | 455 | usb_free_urb(int_out_urb); |
f81ee4d5 | 456 | error_no_urb: |
946b960d GKH |
457 | atomic_dec(&dev->write_busy); |
458 | wake_up_interruptible(&dev->write_wait); | |
459 | exit: | |
460 | mutex_unlock(&dev->mutex); | |
461 | return retval; | |
462 | } | |
463 | ||
464 | /** | |
465 | * iowarrior_ioctl | |
466 | */ | |
824f16fd AC |
467 | static long iowarrior_ioctl(struct file *file, unsigned int cmd, |
468 | unsigned long arg) | |
946b960d GKH |
469 | { |
470 | struct iowarrior *dev = NULL; | |
471 | __u8 *buffer; | |
472 | __u8 __user *user_buffer; | |
473 | int retval; | |
474 | int io_res; /* checks for bytes read/written and copy_to/from_user results */ | |
475 | ||
5bd6e8b3 | 476 | dev = file->private_data; |
3cfb4842 | 477 | if (!dev) |
946b960d | 478 | return -ENODEV; |
946b960d GKH |
479 | |
480 | buffer = kzalloc(dev->report_size, GFP_KERNEL); | |
481 | if (!buffer) | |
482 | return -ENOMEM; | |
483 | ||
484 | /* lock this object */ | |
925ce689 | 485 | mutex_lock(&iowarrior_mutex); |
946b960d GKH |
486 | mutex_lock(&dev->mutex); |
487 | ||
488 | /* verify that the device wasn't unplugged */ | |
489 | if (!dev->present) { | |
fc0f8fc9 ON |
490 | retval = -ENODEV; |
491 | goto error_out; | |
946b960d GKH |
492 | } |
493 | ||
549e8350 JP |
494 | dev_dbg(&dev->interface->dev, "minor %d, cmd 0x%.4x, arg %ld\n", |
495 | dev->minor, cmd, arg); | |
946b960d GKH |
496 | |
497 | retval = 0; | |
498 | io_res = 0; | |
499 | switch (cmd) { | |
500 | case IOW_WRITE: | |
501 | if (dev->product_id == USB_DEVICE_ID_CODEMERCS_IOW24 || | |
502 | dev->product_id == USB_DEVICE_ID_CODEMERCS_IOWPV1 || | |
503 | dev->product_id == USB_DEVICE_ID_CODEMERCS_IOWPV2 || | |
504 | dev->product_id == USB_DEVICE_ID_CODEMERCS_IOW40) { | |
505 | user_buffer = (__u8 __user *)arg; | |
506 | io_res = copy_from_user(buffer, user_buffer, | |
507 | dev->report_size); | |
508 | if (io_res) { | |
509 | retval = -EFAULT; | |
510 | } else { | |
511 | io_res = usb_set_report(dev->interface, 2, 0, | |
512 | buffer, | |
513 | dev->report_size); | |
514 | if (io_res < 0) | |
515 | retval = io_res; | |
516 | } | |
517 | } else { | |
518 | retval = -EINVAL; | |
519 | dev_err(&dev->interface->dev, | |
898eb71c | 520 | "ioctl 'IOW_WRITE' is not supported for product=0x%x.\n", |
946b960d GKH |
521 | dev->product_id); |
522 | } | |
523 | break; | |
524 | case IOW_READ: | |
525 | user_buffer = (__u8 __user *)arg; | |
526 | io_res = usb_get_report(dev->udev, | |
527 | dev->interface->cur_altsetting, 1, 0, | |
528 | buffer, dev->report_size); | |
529 | if (io_res < 0) | |
530 | retval = io_res; | |
531 | else { | |
532 | io_res = copy_to_user(user_buffer, buffer, dev->report_size); | |
6d4d4554 | 533 | if (io_res) |
946b960d GKH |
534 | retval = -EFAULT; |
535 | } | |
536 | break; | |
537 | case IOW_GETINFO: | |
538 | { | |
539 | /* Report available information for the device */ | |
540 | struct iowarrior_info info; | |
541 | /* needed for power consumption */ | |
542 | struct usb_config_descriptor *cfg_descriptor = &dev->udev->actconfig->desc; | |
543 | ||
eca67aae | 544 | memset(&info, 0, sizeof(info)); |
946b960d GKH |
545 | /* directly from the descriptor */ |
546 | info.vendor = le16_to_cpu(dev->udev->descriptor.idVendor); | |
547 | info.product = dev->product_id; | |
548 | info.revision = le16_to_cpu(dev->udev->descriptor.bcdDevice); | |
549 | ||
550 | /* 0==UNKNOWN, 1==LOW(usb1.1) ,2=FULL(usb1.1), 3=HIGH(usb2.0) */ | |
dd5ca753 | 551 | info.speed = dev->udev->speed; |
946b960d GKH |
552 | info.if_num = dev->interface->cur_altsetting->desc.bInterfaceNumber; |
553 | info.report_size = dev->report_size; | |
554 | ||
555 | /* serial number string has been read earlier 8 chars or empty string */ | |
556 | memcpy(info.serial, dev->chip_serial, | |
557 | sizeof(dev->chip_serial)); | |
558 | if (cfg_descriptor == NULL) { | |
559 | info.power = -1; /* no information available */ | |
560 | } else { | |
561 | /* the MaxPower is stored in units of 2mA to make it fit into a byte-value */ | |
562 | info.power = cfg_descriptor->bMaxPower * 2; | |
563 | } | |
564 | io_res = copy_to_user((struct iowarrior_info __user *)arg, &info, | |
565 | sizeof(struct iowarrior_info)); | |
6d4d4554 | 566 | if (io_res) |
946b960d GKH |
567 | retval = -EFAULT; |
568 | break; | |
569 | } | |
570 | default: | |
571 | /* return that we did not understand this ioctl call */ | |
572 | retval = -ENOTTY; | |
573 | break; | |
574 | } | |
fc0f8fc9 | 575 | error_out: |
946b960d GKH |
576 | /* unlock the device */ |
577 | mutex_unlock(&dev->mutex); | |
925ce689 | 578 | mutex_unlock(&iowarrior_mutex); |
fc0f8fc9 | 579 | kfree(buffer); |
946b960d GKH |
580 | return retval; |
581 | } | |
582 | ||
583 | /** | |
584 | * iowarrior_open | |
585 | */ | |
586 | static int iowarrior_open(struct inode *inode, struct file *file) | |
587 | { | |
588 | struct iowarrior *dev = NULL; | |
589 | struct usb_interface *interface; | |
590 | int subminor; | |
591 | int retval = 0; | |
592 | ||
925ce689 | 593 | mutex_lock(&iowarrior_mutex); |
946b960d GKH |
594 | subminor = iminor(inode); |
595 | ||
946b960d GKH |
596 | interface = usb_find_interface(&iowarrior_driver, subminor); |
597 | if (!interface) { | |
925ce689 | 598 | mutex_unlock(&iowarrior_mutex); |
1c2eef03 GKH |
599 | printk(KERN_ERR "%s - error, can't find device for minor %d\n", |
600 | __func__, subminor); | |
d4ead16f | 601 | return -ENODEV; |
946b960d GKH |
602 | } |
603 | ||
03f36e88 | 604 | mutex_lock(&iowarrior_open_disc_lock); |
946b960d | 605 | dev = usb_get_intfdata(interface); |
03f36e88 ON |
606 | if (!dev) { |
607 | mutex_unlock(&iowarrior_open_disc_lock); | |
925ce689 | 608 | mutex_unlock(&iowarrior_mutex); |
d4ead16f | 609 | return -ENODEV; |
03f36e88 | 610 | } |
d4ead16f AS |
611 | |
612 | mutex_lock(&dev->mutex); | |
03f36e88 | 613 | mutex_unlock(&iowarrior_open_disc_lock); |
946b960d GKH |
614 | |
615 | /* Only one process can open each device, no sharing. */ | |
616 | if (dev->opened) { | |
617 | retval = -EBUSY; | |
618 | goto out; | |
619 | } | |
620 | ||
621 | /* setup interrupt handler for receiving values */ | |
622 | if ((retval = usb_submit_urb(dev->int_in_urb, GFP_KERNEL)) < 0) { | |
623 | dev_err(&interface->dev, "Error %d while submitting URB\n", retval); | |
624 | retval = -EFAULT; | |
625 | goto out; | |
626 | } | |
627 | /* increment our usage count for the driver */ | |
628 | ++dev->opened; | |
629 | /* save our object in the file's private structure */ | |
630 | file->private_data = dev; | |
631 | retval = 0; | |
632 | ||
633 | out: | |
d4ead16f | 634 | mutex_unlock(&dev->mutex); |
925ce689 | 635 | mutex_unlock(&iowarrior_mutex); |
946b960d GKH |
636 | return retval; |
637 | } | |
638 | ||
639 | /** | |
640 | * iowarrior_release | |
641 | */ | |
642 | static int iowarrior_release(struct inode *inode, struct file *file) | |
643 | { | |
644 | struct iowarrior *dev; | |
645 | int retval = 0; | |
646 | ||
5bd6e8b3 | 647 | dev = file->private_data; |
3cfb4842 | 648 | if (!dev) |
946b960d | 649 | return -ENODEV; |
946b960d | 650 | |
549e8350 | 651 | dev_dbg(&dev->interface->dev, "minor %d\n", dev->minor); |
946b960d GKH |
652 | |
653 | /* lock our device */ | |
654 | mutex_lock(&dev->mutex); | |
655 | ||
656 | if (dev->opened <= 0) { | |
657 | retval = -ENODEV; /* close called more than once */ | |
658 | mutex_unlock(&dev->mutex); | |
659 | } else { | |
a895d57d | 660 | dev->opened = 0; /* we're closing now */ |
946b960d GKH |
661 | retval = 0; |
662 | if (dev->present) { | |
663 | /* | |
664 | The device is still connected so we only shutdown | |
665 | pending read-/write-ops. | |
666 | */ | |
667 | usb_kill_urb(dev->int_in_urb); | |
668 | wake_up_interruptible(&dev->read_wait); | |
669 | wake_up_interruptible(&dev->write_wait); | |
670 | mutex_unlock(&dev->mutex); | |
671 | } else { | |
672 | /* The device was unplugged, cleanup resources */ | |
673 | mutex_unlock(&dev->mutex); | |
674 | iowarrior_delete(dev); | |
675 | } | |
676 | } | |
677 | return retval; | |
678 | } | |
679 | ||
afc9a42b | 680 | static __poll_t iowarrior_poll(struct file *file, poll_table * wait) |
946b960d GKH |
681 | { |
682 | struct iowarrior *dev = file->private_data; | |
afc9a42b | 683 | __poll_t mask = 0; |
946b960d GKH |
684 | |
685 | if (!dev->present) | |
a9a08845 | 686 | return EPOLLERR | EPOLLHUP; |
946b960d GKH |
687 | |
688 | poll_wait(file, &dev->read_wait, wait); | |
689 | poll_wait(file, &dev->write_wait, wait); | |
690 | ||
691 | if (!dev->present) | |
a9a08845 | 692 | return EPOLLERR | EPOLLHUP; |
946b960d GKH |
693 | |
694 | if (read_index(dev) != -1) | |
a9a08845 | 695 | mask |= EPOLLIN | EPOLLRDNORM; |
946b960d GKH |
696 | |
697 | if (atomic_read(&dev->write_busy) < MAX_WRITES_IN_FLIGHT) | |
a9a08845 | 698 | mask |= EPOLLOUT | EPOLLWRNORM; |
946b960d GKH |
699 | return mask; |
700 | } | |
701 | ||
702 | /* | |
703 | * File operations needed when we register this driver. | |
704 | * This assumes that this driver NEEDS file operations, | |
705 | * of course, which means that the driver is expected | |
706 | * to have a node in the /dev directory. If the USB | |
707 | * device were for a network interface then the driver | |
708 | * would use "struct net_driver" instead, and a serial | |
709 | * device would use "struct tty_driver". | |
710 | */ | |
0b3f5fe6 | 711 | static const struct file_operations iowarrior_fops = { |
946b960d GKH |
712 | .owner = THIS_MODULE, |
713 | .write = iowarrior_write, | |
714 | .read = iowarrior_read, | |
824f16fd | 715 | .unlocked_ioctl = iowarrior_ioctl, |
946b960d GKH |
716 | .open = iowarrior_open, |
717 | .release = iowarrior_release, | |
718 | .poll = iowarrior_poll, | |
6038f373 | 719 | .llseek = noop_llseek, |
946b960d GKH |
720 | }; |
721 | ||
2c9ede55 | 722 | static char *iowarrior_devnode(struct device *dev, umode_t *mode) |
f7a386c5 KS |
723 | { |
724 | return kasprintf(GFP_KERNEL, "usb/%s", dev_name(dev)); | |
725 | } | |
726 | ||
946b960d GKH |
727 | /* |
728 | * usb class driver info in order to get a minor number from the usb core, | |
729 | * and to have the device registered with devfs and the driver core | |
730 | */ | |
731 | static struct usb_class_driver iowarrior_class = { | |
732 | .name = "iowarrior%d", | |
e454cea2 | 733 | .devnode = iowarrior_devnode, |
946b960d GKH |
734 | .fops = &iowarrior_fops, |
735 | .minor_base = IOWARRIOR_MINOR_BASE, | |
736 | }; | |
737 | ||
738 | /*---------------------------------*/ | |
739 | /* probe and disconnect functions */ | |
740 | /*---------------------------------*/ | |
741 | /** | |
742 | * iowarrior_probe | |
743 | * | |
744 | * Called by the usb core when a new device is connected that it thinks | |
745 | * this driver might be interested in. | |
746 | */ | |
747 | static int iowarrior_probe(struct usb_interface *interface, | |
748 | const struct usb_device_id *id) | |
749 | { | |
750 | struct usb_device *udev = interface_to_usbdev(interface); | |
751 | struct iowarrior *dev = NULL; | |
752 | struct usb_host_interface *iface_desc; | |
946b960d | 753 | int retval = -ENOMEM; |
920df8d7 | 754 | int res; |
946b960d | 755 | |
b595076a | 756 | /* allocate memory for our device state and initialize it */ |
946b960d | 757 | dev = kzalloc(sizeof(struct iowarrior), GFP_KERNEL); |
3cfb4842 | 758 | if (!dev) |
946b960d | 759 | return retval; |
946b960d GKH |
760 | |
761 | mutex_init(&dev->mutex); | |
762 | ||
763 | atomic_set(&dev->intr_idx, 0); | |
764 | atomic_set(&dev->read_idx, 0); | |
946b960d GKH |
765 | atomic_set(&dev->overflow_flag, 0); |
766 | init_waitqueue_head(&dev->read_wait); | |
767 | atomic_set(&dev->write_busy, 0); | |
768 | init_waitqueue_head(&dev->write_wait); | |
769 | ||
770 | dev->udev = udev; | |
80cd5479 | 771 | dev->interface = usb_get_intf(interface); |
946b960d GKH |
772 | |
773 | iface_desc = interface->cur_altsetting; | |
774 | dev->product_id = le16_to_cpu(udev->descriptor.idProduct); | |
775 | ||
b5f8d468 JH |
776 | init_usb_anchor(&dev->submitted); |
777 | ||
920df8d7 JH |
778 | res = usb_find_last_int_in_endpoint(iface_desc, &dev->int_in_endpoint); |
779 | if (res) { | |
b7321e81 | 780 | dev_err(&interface->dev, "no interrupt-in endpoint found\n"); |
920df8d7 | 781 | retval = res; |
b7321e81 JH |
782 | goto error; |
783 | } | |
784 | ||
de46e566 | 785 | if (dev->product_id == USB_DEVICE_ID_CODEMERCS_IOW56) { |
920df8d7 JH |
786 | res = usb_find_last_int_out_endpoint(iface_desc, |
787 | &dev->int_out_endpoint); | |
788 | if (res) { | |
de46e566 | 789 | dev_err(&interface->dev, "no interrupt-out endpoint found\n"); |
920df8d7 | 790 | retval = res; |
de46e566 JH |
791 | goto error; |
792 | } | |
793 | } | |
794 | ||
a895d57d | 795 | /* we have to check the report_size often, so remember it in the endianness suitable for our machine */ |
29cc8897 | 796 | dev->report_size = usb_endpoint_maxp(dev->int_in_endpoint); |
946b960d GKH |
797 | if ((dev->interface->cur_altsetting->desc.bInterfaceNumber == 0) && |
798 | (dev->product_id == USB_DEVICE_ID_CODEMERCS_IOW56)) | |
799 | /* IOWarrior56 has wMaxPacketSize different from report size */ | |
800 | dev->report_size = 7; | |
801 | ||
802 | /* create the urb and buffer for reading */ | |
803 | dev->int_in_urb = usb_alloc_urb(0, GFP_KERNEL); | |
5656bbb7 | 804 | if (!dev->int_in_urb) |
946b960d | 805 | goto error; |
946b960d | 806 | dev->int_in_buffer = kmalloc(dev->report_size, GFP_KERNEL); |
3cfb4842 | 807 | if (!dev->int_in_buffer) |
946b960d | 808 | goto error; |
946b960d GKH |
809 | usb_fill_int_urb(dev->int_in_urb, dev->udev, |
810 | usb_rcvintpipe(dev->udev, | |
811 | dev->int_in_endpoint->bEndpointAddress), | |
812 | dev->int_in_buffer, dev->report_size, | |
813 | iowarrior_callback, dev, | |
814 | dev->int_in_endpoint->bInterval); | |
815 | /* create an internal buffer for interrupt data from the device */ | |
816 | dev->read_queue = | |
23feefda GS |
817 | kmalloc_array(dev->report_size + 1, MAX_INTERRUPT_BUFFER, |
818 | GFP_KERNEL); | |
3cfb4842 | 819 | if (!dev->read_queue) |
946b960d | 820 | goto error; |
946b960d GKH |
821 | /* Get the serial-number of the chip */ |
822 | memset(dev->chip_serial, 0x00, sizeof(dev->chip_serial)); | |
823 | usb_string(udev, udev->descriptor.iSerialNumber, dev->chip_serial, | |
824 | sizeof(dev->chip_serial)); | |
825 | if (strlen(dev->chip_serial) != 8) | |
826 | memset(dev->chip_serial, 0x00, sizeof(dev->chip_serial)); | |
827 | ||
828 | /* Set the idle timeout to 0, if this is interface 0 */ | |
829 | if (dev->interface->cur_altsetting->desc.bInterfaceNumber == 0) { | |
147c5a17 EF |
830 | usb_control_msg(udev, usb_sndctrlpipe(udev, 0), |
831 | 0x0A, | |
832 | USB_TYPE_CLASS | USB_RECIP_INTERFACE, 0, | |
833 | 0, NULL, 0, USB_CTRL_SET_TIMEOUT); | |
946b960d GKH |
834 | } |
835 | /* allow device read and ioctl */ | |
836 | dev->present = 1; | |
837 | ||
838 | /* we can register the device now, as it is ready */ | |
839 | usb_set_intfdata(interface, dev); | |
840 | ||
841 | retval = usb_register_dev(interface, &iowarrior_class); | |
842 | if (retval) { | |
843 | /* something prevented us from registering this driver */ | |
844 | dev_err(&interface->dev, "Not able to get a minor for this device.\n"); | |
845 | usb_set_intfdata(interface, NULL); | |
846 | goto error; | |
847 | } | |
848 | ||
849 | dev->minor = interface->minor; | |
850 | ||
851 | /* let the user know what node this device is now attached to */ | |
852 | dev_info(&interface->dev, "IOWarrior product=0x%x, serial=%s interface=%d " | |
853 | "now attached to iowarrior%d\n", dev->product_id, dev->chip_serial, | |
854 | iface_desc->desc.bInterfaceNumber, dev->minor - IOWARRIOR_MINOR_BASE); | |
855 | return retval; | |
856 | ||
857 | error: | |
858 | iowarrior_delete(dev); | |
859 | return retval; | |
860 | } | |
861 | ||
862 | /** | |
863 | * iowarrior_disconnect | |
864 | * | |
865 | * Called by the usb core when the device is removed from the system. | |
866 | */ | |
867 | static void iowarrior_disconnect(struct usb_interface *interface) | |
868 | { | |
869 | struct iowarrior *dev; | |
870 | int minor; | |
871 | ||
946b960d | 872 | dev = usb_get_intfdata(interface); |
03f36e88 | 873 | mutex_lock(&iowarrior_open_disc_lock); |
946b960d GKH |
874 | usb_set_intfdata(interface, NULL); |
875 | ||
946b960d | 876 | minor = dev->minor; |
c468a8aa ON |
877 | mutex_unlock(&iowarrior_open_disc_lock); |
878 | /* give back our minor - this will call close() locks need to be dropped at this point*/ | |
946b960d | 879 | |
946b960d GKH |
880 | usb_deregister_dev(interface, &iowarrior_class); |
881 | ||
d4ead16f AS |
882 | mutex_lock(&dev->mutex); |
883 | ||
946b960d | 884 | /* prevent device read, write and ioctl */ |
edc4746f | 885 | dev->present = 0; |
946b960d GKH |
886 | |
887 | if (dev->opened) { | |
888 | /* There is a process that holds a filedescriptor to the device , | |
889 | so we only shutdown read-/write-ops going on. | |
890 | Deleting the device is postponed until close() was called. | |
891 | */ | |
892 | usb_kill_urb(dev->int_in_urb); | |
b5f8d468 | 893 | usb_kill_anchored_urbs(&dev->submitted); |
946b960d GKH |
894 | wake_up_interruptible(&dev->read_wait); |
895 | wake_up_interruptible(&dev->write_wait); | |
edc4746f | 896 | mutex_unlock(&dev->mutex); |
946b960d GKH |
897 | } else { |
898 | /* no process is using the device, cleanup now */ | |
edc4746f | 899 | mutex_unlock(&dev->mutex); |
946b960d GKH |
900 | iowarrior_delete(dev); |
901 | } | |
946b960d GKH |
902 | |
903 | dev_info(&interface->dev, "I/O-Warror #%d now disconnected\n", | |
904 | minor - IOWARRIOR_MINOR_BASE); | |
905 | } | |
906 | ||
907 | /* usb specific object needed to register this driver with the usb subsystem */ | |
908 | static struct usb_driver iowarrior_driver = { | |
909 | .name = "iowarrior", | |
910 | .probe = iowarrior_probe, | |
911 | .disconnect = iowarrior_disconnect, | |
912 | .id_table = iowarrior_ids, | |
913 | }; | |
914 | ||
65db4305 | 915 | module_usb_driver(iowarrior_driver); |