]>
Commit | Line | Data |
---|---|---|
946b960d GKH |
1 | /* |
2 | * Native support for the I/O-Warrior USB devices | |
3 | * | |
4 | * Copyright (c) 2003-2005 Code Mercenaries GmbH | |
5 | * written by Christian Lucht <lucht@codemercs.com> | |
6 | * | |
7 | * based on | |
8 | ||
9 | * usb-skeleton.c by Greg Kroah-Hartman <greg@kroah.com> | |
10 | * brlvger.c by Stephane Dalton <sdalton@videotron.ca> | |
11 | * and St�hane Doyon <s.doyon@videotron.ca> | |
12 | * | |
13 | * Released under the GPLv2. | |
14 | */ | |
15 | ||
16 | #include <linux/module.h> | |
17 | #include <linux/usb.h> | |
946b960d GKH |
18 | #include <linux/slab.h> |
19 | #include <linux/sched.h> | |
925ce689 | 20 | #include <linux/mutex.h> |
946b960d | 21 | #include <linux/poll.h> |
946b960d GKH |
22 | #include <linux/usb/iowarrior.h> |
23 | ||
24 | /* Version Information */ | |
25 | #define DRIVER_VERSION "v0.4.0" | |
26 | #define DRIVER_AUTHOR "Christian Lucht <lucht@codemercs.com>" | |
27 | #define DRIVER_DESC "USB IO-Warrior driver (Linux 2.6.x)" | |
28 | ||
29 | #define USB_VENDOR_ID_CODEMERCS 1984 | |
30 | /* low speed iowarrior */ | |
31 | #define USB_DEVICE_ID_CODEMERCS_IOW40 0x1500 | |
32 | #define USB_DEVICE_ID_CODEMERCS_IOW24 0x1501 | |
33 | #define USB_DEVICE_ID_CODEMERCS_IOWPV1 0x1511 | |
34 | #define USB_DEVICE_ID_CODEMERCS_IOWPV2 0x1512 | |
35 | /* full speed iowarrior */ | |
36 | #define USB_DEVICE_ID_CODEMERCS_IOW56 0x1503 | |
37 | ||
38 | /* Get a minor range for your devices from the usb maintainer */ | |
39 | #ifdef CONFIG_USB_DYNAMIC_MINORS | |
40 | #define IOWARRIOR_MINOR_BASE 0 | |
41 | #else | |
25985edc | 42 | #define IOWARRIOR_MINOR_BASE 208 // SKELETON_MINOR_BASE 192 + 16, not official yet |
946b960d GKH |
43 | #endif |
44 | ||
45 | /* interrupt input queue size */ | |
46 | #define MAX_INTERRUPT_BUFFER 16 | |
47 | /* | |
48 | maximum number of urbs that are submitted for writes at the same time, | |
49 | this applies to the IOWarrior56 only! | |
50 | IOWarrior24 and IOWarrior40 use synchronous usb_control_msg calls. | |
51 | */ | |
52 | #define MAX_WRITES_IN_FLIGHT 4 | |
53 | ||
946b960d GKH |
54 | MODULE_AUTHOR(DRIVER_AUTHOR); |
55 | MODULE_DESCRIPTION(DRIVER_DESC); | |
56 | MODULE_LICENSE("GPL"); | |
57 | ||
58 | /* Module parameters */ | |
925ce689 | 59 | static DEFINE_MUTEX(iowarrior_mutex); |
946b960d GKH |
60 | |
61 | static struct usb_driver iowarrior_driver; | |
03f36e88 | 62 | static DEFINE_MUTEX(iowarrior_open_disc_lock); |
946b960d GKH |
63 | |
64 | /*--------------*/ | |
65 | /* data */ | |
66 | /*--------------*/ | |
67 | ||
68 | /* Structure to hold all of our device specific stuff */ | |
69 | struct iowarrior { | |
70 | struct mutex mutex; /* locks this structure */ | |
71 | struct usb_device *udev; /* save off the usb device pointer */ | |
72 | struct usb_interface *interface; /* the interface for this device */ | |
73 | unsigned char minor; /* the starting minor number for this device */ | |
74 | struct usb_endpoint_descriptor *int_out_endpoint; /* endpoint for reading (needed for IOW56 only) */ | |
75 | struct usb_endpoint_descriptor *int_in_endpoint; /* endpoint for reading */ | |
76 | struct urb *int_in_urb; /* the urb for reading data */ | |
77 | unsigned char *int_in_buffer; /* buffer for data to be read */ | |
78 | unsigned char serial_number; /* to detect lost packages */ | |
79 | unsigned char *read_queue; /* size is MAX_INTERRUPT_BUFFER * packet size */ | |
80 | wait_queue_head_t read_wait; | |
81 | wait_queue_head_t write_wait; /* wait-queue for writing to the device */ | |
82 | atomic_t write_busy; /* number of write-urbs submitted */ | |
83 | atomic_t read_idx; | |
84 | atomic_t intr_idx; | |
85 | spinlock_t intr_idx_lock; /* protects intr_idx */ | |
86 | atomic_t overflow_flag; /* signals an index 'rollover' */ | |
87 | int present; /* this is 1 as long as the device is connected */ | |
88 | int opened; /* this is 1 if the device is currently open */ | |
89 | char chip_serial[9]; /* the serial number string of the chip connected */ | |
90 | int report_size; /* number of bytes in a report */ | |
91 | u16 product_id; | |
92 | }; | |
93 | ||
94 | /*--------------*/ | |
95 | /* globals */ | |
96 | /*--------------*/ | |
946b960d GKH |
97 | |
98 | /* | |
99 | * USB spec identifies 5 second timeouts. | |
100 | */ | |
101 | #define GET_TIMEOUT 5 | |
102 | #define USB_REQ_GET_REPORT 0x01 | |
103 | //#if 0 | |
104 | static int usb_get_report(struct usb_device *dev, | |
105 | struct usb_host_interface *inter, unsigned char type, | |
106 | unsigned char id, void *buf, int size) | |
107 | { | |
108 | return usb_control_msg(dev, usb_rcvctrlpipe(dev, 0), | |
109 | USB_REQ_GET_REPORT, | |
110 | USB_DIR_IN | USB_TYPE_CLASS | | |
111 | USB_RECIP_INTERFACE, (type << 8) + id, | |
112 | inter->desc.bInterfaceNumber, buf, size, | |
147c5a17 | 113 | GET_TIMEOUT*HZ); |
946b960d GKH |
114 | } |
115 | //#endif | |
116 | ||
117 | #define USB_REQ_SET_REPORT 0x09 | |
118 | ||
119 | static int usb_set_report(struct usb_interface *intf, unsigned char type, | |
120 | unsigned char id, void *buf, int size) | |
121 | { | |
122 | return usb_control_msg(interface_to_usbdev(intf), | |
123 | usb_sndctrlpipe(interface_to_usbdev(intf), 0), | |
124 | USB_REQ_SET_REPORT, | |
125 | USB_TYPE_CLASS | USB_RECIP_INTERFACE, | |
126 | (type << 8) + id, | |
127 | intf->cur_altsetting->desc.bInterfaceNumber, buf, | |
147c5a17 | 128 | size, HZ); |
946b960d GKH |
129 | } |
130 | ||
131 | /*---------------------*/ | |
132 | /* driver registration */ | |
133 | /*---------------------*/ | |
134 | /* table of devices that work with this driver */ | |
33b9e162 | 135 | static const struct usb_device_id iowarrior_ids[] = { |
946b960d GKH |
136 | {USB_DEVICE(USB_VENDOR_ID_CODEMERCS, USB_DEVICE_ID_CODEMERCS_IOW40)}, |
137 | {USB_DEVICE(USB_VENDOR_ID_CODEMERCS, USB_DEVICE_ID_CODEMERCS_IOW24)}, | |
138 | {USB_DEVICE(USB_VENDOR_ID_CODEMERCS, USB_DEVICE_ID_CODEMERCS_IOWPV1)}, | |
139 | {USB_DEVICE(USB_VENDOR_ID_CODEMERCS, USB_DEVICE_ID_CODEMERCS_IOWPV2)}, | |
140 | {USB_DEVICE(USB_VENDOR_ID_CODEMERCS, USB_DEVICE_ID_CODEMERCS_IOW56)}, | |
141 | {} /* Terminating entry */ | |
142 | }; | |
143 | MODULE_DEVICE_TABLE(usb, iowarrior_ids); | |
144 | ||
145 | /* | |
146 | * USB callback handler for reading data | |
147 | */ | |
148 | static void iowarrior_callback(struct urb *urb) | |
149 | { | |
cdc97792 | 150 | struct iowarrior *dev = urb->context; |
946b960d GKH |
151 | int intr_idx; |
152 | int read_idx; | |
153 | int aux_idx; | |
154 | int offset; | |
fb3abee6 GKH |
155 | int status = urb->status; |
156 | int retval; | |
946b960d | 157 | |
fb3abee6 | 158 | switch (status) { |
946b960d GKH |
159 | case 0: |
160 | /* success */ | |
161 | break; | |
162 | case -ECONNRESET: | |
163 | case -ENOENT: | |
164 | case -ESHUTDOWN: | |
165 | return; | |
166 | default: | |
167 | goto exit; | |
168 | } | |
169 | ||
170 | spin_lock(&dev->intr_idx_lock); | |
171 | intr_idx = atomic_read(&dev->intr_idx); | |
172 | /* aux_idx become previous intr_idx */ | |
173 | aux_idx = (intr_idx == 0) ? (MAX_INTERRUPT_BUFFER - 1) : (intr_idx - 1); | |
174 | read_idx = atomic_read(&dev->read_idx); | |
175 | ||
176 | /* queue is not empty and it's interface 0 */ | |
177 | if ((intr_idx != read_idx) | |
178 | && (dev->interface->cur_altsetting->desc.bInterfaceNumber == 0)) { | |
179 | /* + 1 for serial number */ | |
180 | offset = aux_idx * (dev->report_size + 1); | |
181 | if (!memcmp | |
182 | (dev->read_queue + offset, urb->transfer_buffer, | |
183 | dev->report_size)) { | |
184 | /* equal values on interface 0 will be ignored */ | |
185 | spin_unlock(&dev->intr_idx_lock); | |
186 | goto exit; | |
187 | } | |
188 | } | |
189 | ||
190 | /* aux_idx become next intr_idx */ | |
191 | aux_idx = (intr_idx == (MAX_INTERRUPT_BUFFER - 1)) ? 0 : (intr_idx + 1); | |
192 | if (read_idx == aux_idx) { | |
193 | /* queue full, dropping oldest input */ | |
194 | read_idx = (++read_idx == MAX_INTERRUPT_BUFFER) ? 0 : read_idx; | |
195 | atomic_set(&dev->read_idx, read_idx); | |
196 | atomic_set(&dev->overflow_flag, 1); | |
197 | } | |
198 | ||
199 | /* +1 for serial number */ | |
200 | offset = intr_idx * (dev->report_size + 1); | |
201 | memcpy(dev->read_queue + offset, urb->transfer_buffer, | |
202 | dev->report_size); | |
203 | *(dev->read_queue + offset + (dev->report_size)) = dev->serial_number++; | |
204 | ||
205 | atomic_set(&dev->intr_idx, aux_idx); | |
206 | spin_unlock(&dev->intr_idx_lock); | |
207 | /* tell the blocking read about the new data */ | |
208 | wake_up_interruptible(&dev->read_wait); | |
209 | ||
210 | exit: | |
fb3abee6 GKH |
211 | retval = usb_submit_urb(urb, GFP_ATOMIC); |
212 | if (retval) | |
898eb71c | 213 | dev_err(&dev->interface->dev, "%s - usb_submit_urb failed with result %d\n", |
441b62c1 | 214 | __func__, retval); |
946b960d GKH |
215 | |
216 | } | |
217 | ||
218 | /* | |
219 | * USB Callback handler for write-ops | |
220 | */ | |
221 | static void iowarrior_write_callback(struct urb *urb) | |
222 | { | |
223 | struct iowarrior *dev; | |
fb3abee6 GKH |
224 | int status = urb->status; |
225 | ||
cdc97792 | 226 | dev = urb->context; |
946b960d | 227 | /* sync/async unlink faults aren't errors */ |
fb3abee6 GKH |
228 | if (status && |
229 | !(status == -ENOENT || | |
230 | status == -ECONNRESET || status == -ESHUTDOWN)) { | |
549e8350 JP |
231 | dev_dbg(&dev->interface->dev, |
232 | "nonzero write bulk status received: %d\n", status); | |
946b960d GKH |
233 | } |
234 | /* free up our allocated buffer */ | |
997ea58e DM |
235 | usb_free_coherent(urb->dev, urb->transfer_buffer_length, |
236 | urb->transfer_buffer, urb->transfer_dma); | |
946b960d GKH |
237 | /* tell a waiting writer the interrupt-out-pipe is available again */ |
238 | atomic_dec(&dev->write_busy); | |
239 | wake_up_interruptible(&dev->write_wait); | |
240 | } | |
241 | ||
242 | /** | |
243 | * iowarrior_delete | |
244 | */ | |
245 | static inline void iowarrior_delete(struct iowarrior *dev) | |
246 | { | |
549e8350 | 247 | dev_dbg(&dev->interface->dev, "minor %d\n", dev->minor); |
946b960d GKH |
248 | kfree(dev->int_in_buffer); |
249 | usb_free_urb(dev->int_in_urb); | |
250 | kfree(dev->read_queue); | |
251 | kfree(dev); | |
252 | } | |
253 | ||
254 | /*---------------------*/ | |
255 | /* fops implementation */ | |
256 | /*---------------------*/ | |
257 | ||
258 | static int read_index(struct iowarrior *dev) | |
259 | { | |
260 | int intr_idx, read_idx; | |
261 | ||
262 | read_idx = atomic_read(&dev->read_idx); | |
263 | intr_idx = atomic_read(&dev->intr_idx); | |
264 | ||
265 | return (read_idx == intr_idx ? -1 : read_idx); | |
266 | } | |
267 | ||
268 | /** | |
269 | * iowarrior_read | |
270 | */ | |
271 | static ssize_t iowarrior_read(struct file *file, char __user *buffer, | |
272 | size_t count, loff_t *ppos) | |
273 | { | |
274 | struct iowarrior *dev; | |
275 | int read_idx; | |
276 | int offset; | |
277 | ||
5bd6e8b3 | 278 | dev = file->private_data; |
946b960d GKH |
279 | |
280 | /* verify that the device wasn't unplugged */ | |
3cfb4842 | 281 | if (!dev || !dev->present) |
946b960d GKH |
282 | return -ENODEV; |
283 | ||
549e8350 JP |
284 | dev_dbg(&dev->interface->dev, "minor %d, count = %zd\n", |
285 | dev->minor, count); | |
946b960d GKH |
286 | |
287 | /* read count must be packet size (+ time stamp) */ | |
288 | if ((count != dev->report_size) | |
289 | && (count != (dev->report_size + 1))) | |
290 | return -EINVAL; | |
291 | ||
292 | /* repeat until no buffer overrun in callback handler occur */ | |
293 | do { | |
294 | atomic_set(&dev->overflow_flag, 0); | |
295 | if ((read_idx = read_index(dev)) == -1) { | |
f38f1418 | 296 | /* queue empty */ |
946b960d GKH |
297 | if (file->f_flags & O_NONBLOCK) |
298 | return -EAGAIN; | |
299 | else { | |
300 | //next line will return when there is either new data, or the device is unplugged | |
301 | int r = wait_event_interruptible(dev->read_wait, | |
302 | (!dev->present | |
303 | || (read_idx = | |
304 | read_index | |
305 | (dev)) != | |
306 | -1)); | |
307 | if (r) { | |
308 | //we were interrupted by a signal | |
309 | return -ERESTART; | |
310 | } | |
311 | if (!dev->present) { | |
312 | //The device was unplugged | |
313 | return -ENODEV; | |
314 | } | |
315 | if (read_idx == -1) { | |
316 | // Can this happen ??? | |
317 | return 0; | |
318 | } | |
319 | } | |
320 | } | |
321 | ||
322 | offset = read_idx * (dev->report_size + 1); | |
323 | if (copy_to_user(buffer, dev->read_queue + offset, count)) { | |
324 | return -EFAULT; | |
325 | } | |
326 | } while (atomic_read(&dev->overflow_flag)); | |
327 | ||
328 | read_idx = ++read_idx == MAX_INTERRUPT_BUFFER ? 0 : read_idx; | |
329 | atomic_set(&dev->read_idx, read_idx); | |
330 | return count; | |
331 | } | |
332 | ||
333 | /* | |
334 | * iowarrior_write | |
335 | */ | |
336 | static ssize_t iowarrior_write(struct file *file, | |
337 | const char __user *user_buffer, | |
338 | size_t count, loff_t *ppos) | |
339 | { | |
340 | struct iowarrior *dev; | |
341 | int retval = 0; | |
342 | char *buf = NULL; /* for IOW24 and IOW56 we need a buffer */ | |
343 | struct urb *int_out_urb = NULL; | |
344 | ||
5bd6e8b3 | 345 | dev = file->private_data; |
946b960d GKH |
346 | |
347 | mutex_lock(&dev->mutex); | |
348 | /* verify that the device wasn't unplugged */ | |
e28c6a77 | 349 | if (!dev->present) { |
946b960d GKH |
350 | retval = -ENODEV; |
351 | goto exit; | |
352 | } | |
549e8350 JP |
353 | dev_dbg(&dev->interface->dev, "minor %d, count = %zd\n", |
354 | dev->minor, count); | |
946b960d GKH |
355 | /* if count is 0 we're already done */ |
356 | if (count == 0) { | |
357 | retval = 0; | |
358 | goto exit; | |
359 | } | |
360 | /* We only accept full reports */ | |
361 | if (count != dev->report_size) { | |
362 | retval = -EINVAL; | |
363 | goto exit; | |
364 | } | |
365 | switch (dev->product_id) { | |
366 | case USB_DEVICE_ID_CODEMERCS_IOW24: | |
367 | case USB_DEVICE_ID_CODEMERCS_IOWPV1: | |
368 | case USB_DEVICE_ID_CODEMERCS_IOWPV2: | |
369 | case USB_DEVICE_ID_CODEMERCS_IOW40: | |
370 | /* IOW24 and IOW40 use a synchronous call */ | |
3ed78011 | 371 | buf = kmalloc(count, GFP_KERNEL); |
946b960d GKH |
372 | if (!buf) { |
373 | retval = -ENOMEM; | |
374 | goto exit; | |
375 | } | |
376 | if (copy_from_user(buf, user_buffer, count)) { | |
377 | retval = -EFAULT; | |
378 | kfree(buf); | |
379 | goto exit; | |
380 | } | |
381 | retval = usb_set_report(dev->interface, 2, 0, buf, count); | |
382 | kfree(buf); | |
383 | goto exit; | |
384 | break; | |
385 | case USB_DEVICE_ID_CODEMERCS_IOW56: | |
386 | /* The IOW56 uses asynchronous IO and more urbs */ | |
387 | if (atomic_read(&dev->write_busy) == MAX_WRITES_IN_FLIGHT) { | |
388 | /* Wait until we are below the limit for submitted urbs */ | |
389 | if (file->f_flags & O_NONBLOCK) { | |
390 | retval = -EAGAIN; | |
391 | goto exit; | |
392 | } else { | |
393 | retval = wait_event_interruptible(dev->write_wait, | |
394 | (!dev->present || (atomic_read (&dev-> write_busy) < MAX_WRITES_IN_FLIGHT))); | |
395 | if (retval) { | |
396 | /* we were interrupted by a signal */ | |
397 | retval = -ERESTART; | |
398 | goto exit; | |
399 | } | |
400 | if (!dev->present) { | |
401 | /* The device was unplugged */ | |
402 | retval = -ENODEV; | |
403 | goto exit; | |
404 | } | |
405 | if (!dev->opened) { | |
406 | /* We were closed while waiting for an URB */ | |
407 | retval = -ENODEV; | |
408 | goto exit; | |
409 | } | |
410 | } | |
411 | } | |
412 | atomic_inc(&dev->write_busy); | |
413 | int_out_urb = usb_alloc_urb(0, GFP_KERNEL); | |
414 | if (!int_out_urb) { | |
415 | retval = -ENOMEM; | |
f81ee4d5 | 416 | goto error_no_urb; |
946b960d | 417 | } |
997ea58e DM |
418 | buf = usb_alloc_coherent(dev->udev, dev->report_size, |
419 | GFP_KERNEL, &int_out_urb->transfer_dma); | |
946b960d GKH |
420 | if (!buf) { |
421 | retval = -ENOMEM; | |
549e8350 JP |
422 | dev_dbg(&dev->interface->dev, |
423 | "Unable to allocate buffer\n"); | |
f81ee4d5 | 424 | goto error_no_buffer; |
946b960d GKH |
425 | } |
426 | usb_fill_int_urb(int_out_urb, dev->udev, | |
427 | usb_sndintpipe(dev->udev, | |
428 | dev->int_out_endpoint->bEndpointAddress), | |
429 | buf, dev->report_size, | |
430 | iowarrior_write_callback, dev, | |
431 | dev->int_out_endpoint->bInterval); | |
432 | int_out_urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP; | |
433 | if (copy_from_user(buf, user_buffer, count)) { | |
434 | retval = -EFAULT; | |
435 | goto error; | |
436 | } | |
437 | retval = usb_submit_urb(int_out_urb, GFP_KERNEL); | |
438 | if (retval) { | |
549e8350 JP |
439 | dev_dbg(&dev->interface->dev, |
440 | "submit error %d for urb nr.%d\n", | |
441 | retval, atomic_read(&dev->write_busy)); | |
946b960d GKH |
442 | goto error; |
443 | } | |
444 | /* submit was ok */ | |
445 | retval = count; | |
446 | usb_free_urb(int_out_urb); | |
447 | goto exit; | |
448 | break; | |
449 | default: | |
450 | /* what do we have here ? An unsupported Product-ID ? */ | |
898eb71c | 451 | dev_err(&dev->interface->dev, "%s - not supported for product=0x%x\n", |
441b62c1 | 452 | __func__, dev->product_id); |
946b960d GKH |
453 | retval = -EFAULT; |
454 | goto exit; | |
455 | break; | |
456 | } | |
457 | error: | |
997ea58e DM |
458 | usb_free_coherent(dev->udev, dev->report_size, buf, |
459 | int_out_urb->transfer_dma); | |
f81ee4d5 | 460 | error_no_buffer: |
946b960d | 461 | usb_free_urb(int_out_urb); |
f81ee4d5 | 462 | error_no_urb: |
946b960d GKH |
463 | atomic_dec(&dev->write_busy); |
464 | wake_up_interruptible(&dev->write_wait); | |
465 | exit: | |
466 | mutex_unlock(&dev->mutex); | |
467 | return retval; | |
468 | } | |
469 | ||
470 | /** | |
471 | * iowarrior_ioctl | |
472 | */ | |
824f16fd AC |
473 | static long iowarrior_ioctl(struct file *file, unsigned int cmd, |
474 | unsigned long arg) | |
946b960d GKH |
475 | { |
476 | struct iowarrior *dev = NULL; | |
477 | __u8 *buffer; | |
478 | __u8 __user *user_buffer; | |
479 | int retval; | |
480 | int io_res; /* checks for bytes read/written and copy_to/from_user results */ | |
481 | ||
5bd6e8b3 | 482 | dev = file->private_data; |
3cfb4842 | 483 | if (!dev) |
946b960d | 484 | return -ENODEV; |
946b960d GKH |
485 | |
486 | buffer = kzalloc(dev->report_size, GFP_KERNEL); | |
487 | if (!buffer) | |
488 | return -ENOMEM; | |
489 | ||
490 | /* lock this object */ | |
925ce689 | 491 | mutex_lock(&iowarrior_mutex); |
946b960d GKH |
492 | mutex_lock(&dev->mutex); |
493 | ||
494 | /* verify that the device wasn't unplugged */ | |
495 | if (!dev->present) { | |
fc0f8fc9 ON |
496 | retval = -ENODEV; |
497 | goto error_out; | |
946b960d GKH |
498 | } |
499 | ||
549e8350 JP |
500 | dev_dbg(&dev->interface->dev, "minor %d, cmd 0x%.4x, arg %ld\n", |
501 | dev->minor, cmd, arg); | |
946b960d GKH |
502 | |
503 | retval = 0; | |
504 | io_res = 0; | |
505 | switch (cmd) { | |
506 | case IOW_WRITE: | |
507 | if (dev->product_id == USB_DEVICE_ID_CODEMERCS_IOW24 || | |
508 | dev->product_id == USB_DEVICE_ID_CODEMERCS_IOWPV1 || | |
509 | dev->product_id == USB_DEVICE_ID_CODEMERCS_IOWPV2 || | |
510 | dev->product_id == USB_DEVICE_ID_CODEMERCS_IOW40) { | |
511 | user_buffer = (__u8 __user *)arg; | |
512 | io_res = copy_from_user(buffer, user_buffer, | |
513 | dev->report_size); | |
514 | if (io_res) { | |
515 | retval = -EFAULT; | |
516 | } else { | |
517 | io_res = usb_set_report(dev->interface, 2, 0, | |
518 | buffer, | |
519 | dev->report_size); | |
520 | if (io_res < 0) | |
521 | retval = io_res; | |
522 | } | |
523 | } else { | |
524 | retval = -EINVAL; | |
525 | dev_err(&dev->interface->dev, | |
898eb71c | 526 | "ioctl 'IOW_WRITE' is not supported for product=0x%x.\n", |
946b960d GKH |
527 | dev->product_id); |
528 | } | |
529 | break; | |
530 | case IOW_READ: | |
531 | user_buffer = (__u8 __user *)arg; | |
532 | io_res = usb_get_report(dev->udev, | |
533 | dev->interface->cur_altsetting, 1, 0, | |
534 | buffer, dev->report_size); | |
535 | if (io_res < 0) | |
536 | retval = io_res; | |
537 | else { | |
538 | io_res = copy_to_user(user_buffer, buffer, dev->report_size); | |
6d4d4554 | 539 | if (io_res) |
946b960d GKH |
540 | retval = -EFAULT; |
541 | } | |
542 | break; | |
543 | case IOW_GETINFO: | |
544 | { | |
545 | /* Report available information for the device */ | |
546 | struct iowarrior_info info; | |
547 | /* needed for power consumption */ | |
548 | struct usb_config_descriptor *cfg_descriptor = &dev->udev->actconfig->desc; | |
549 | ||
eca67aae | 550 | memset(&info, 0, sizeof(info)); |
946b960d GKH |
551 | /* directly from the descriptor */ |
552 | info.vendor = le16_to_cpu(dev->udev->descriptor.idVendor); | |
553 | info.product = dev->product_id; | |
554 | info.revision = le16_to_cpu(dev->udev->descriptor.bcdDevice); | |
555 | ||
556 | /* 0==UNKNOWN, 1==LOW(usb1.1) ,2=FULL(usb1.1), 3=HIGH(usb2.0) */ | |
557 | info.speed = le16_to_cpu(dev->udev->speed); | |
558 | info.if_num = dev->interface->cur_altsetting->desc.bInterfaceNumber; | |
559 | info.report_size = dev->report_size; | |
560 | ||
561 | /* serial number string has been read earlier 8 chars or empty string */ | |
562 | memcpy(info.serial, dev->chip_serial, | |
563 | sizeof(dev->chip_serial)); | |
564 | if (cfg_descriptor == NULL) { | |
565 | info.power = -1; /* no information available */ | |
566 | } else { | |
567 | /* the MaxPower is stored in units of 2mA to make it fit into a byte-value */ | |
568 | info.power = cfg_descriptor->bMaxPower * 2; | |
569 | } | |
570 | io_res = copy_to_user((struct iowarrior_info __user *)arg, &info, | |
571 | sizeof(struct iowarrior_info)); | |
6d4d4554 | 572 | if (io_res) |
946b960d GKH |
573 | retval = -EFAULT; |
574 | break; | |
575 | } | |
576 | default: | |
577 | /* return that we did not understand this ioctl call */ | |
578 | retval = -ENOTTY; | |
579 | break; | |
580 | } | |
fc0f8fc9 | 581 | error_out: |
946b960d GKH |
582 | /* unlock the device */ |
583 | mutex_unlock(&dev->mutex); | |
925ce689 | 584 | mutex_unlock(&iowarrior_mutex); |
fc0f8fc9 | 585 | kfree(buffer); |
946b960d GKH |
586 | return retval; |
587 | } | |
588 | ||
589 | /** | |
590 | * iowarrior_open | |
591 | */ | |
592 | static int iowarrior_open(struct inode *inode, struct file *file) | |
593 | { | |
594 | struct iowarrior *dev = NULL; | |
595 | struct usb_interface *interface; | |
596 | int subminor; | |
597 | int retval = 0; | |
598 | ||
925ce689 | 599 | mutex_lock(&iowarrior_mutex); |
946b960d GKH |
600 | subminor = iminor(inode); |
601 | ||
946b960d GKH |
602 | interface = usb_find_interface(&iowarrior_driver, subminor); |
603 | if (!interface) { | |
925ce689 | 604 | mutex_unlock(&iowarrior_mutex); |
1c2eef03 GKH |
605 | printk(KERN_ERR "%s - error, can't find device for minor %d\n", |
606 | __func__, subminor); | |
d4ead16f | 607 | return -ENODEV; |
946b960d GKH |
608 | } |
609 | ||
03f36e88 | 610 | mutex_lock(&iowarrior_open_disc_lock); |
946b960d | 611 | dev = usb_get_intfdata(interface); |
03f36e88 ON |
612 | if (!dev) { |
613 | mutex_unlock(&iowarrior_open_disc_lock); | |
925ce689 | 614 | mutex_unlock(&iowarrior_mutex); |
d4ead16f | 615 | return -ENODEV; |
03f36e88 | 616 | } |
d4ead16f AS |
617 | |
618 | mutex_lock(&dev->mutex); | |
03f36e88 | 619 | mutex_unlock(&iowarrior_open_disc_lock); |
946b960d GKH |
620 | |
621 | /* Only one process can open each device, no sharing. */ | |
622 | if (dev->opened) { | |
623 | retval = -EBUSY; | |
624 | goto out; | |
625 | } | |
626 | ||
627 | /* setup interrupt handler for receiving values */ | |
628 | if ((retval = usb_submit_urb(dev->int_in_urb, GFP_KERNEL)) < 0) { | |
629 | dev_err(&interface->dev, "Error %d while submitting URB\n", retval); | |
630 | retval = -EFAULT; | |
631 | goto out; | |
632 | } | |
633 | /* increment our usage count for the driver */ | |
634 | ++dev->opened; | |
635 | /* save our object in the file's private structure */ | |
636 | file->private_data = dev; | |
637 | retval = 0; | |
638 | ||
639 | out: | |
d4ead16f | 640 | mutex_unlock(&dev->mutex); |
925ce689 | 641 | mutex_unlock(&iowarrior_mutex); |
946b960d GKH |
642 | return retval; |
643 | } | |
644 | ||
645 | /** | |
646 | * iowarrior_release | |
647 | */ | |
648 | static int iowarrior_release(struct inode *inode, struct file *file) | |
649 | { | |
650 | struct iowarrior *dev; | |
651 | int retval = 0; | |
652 | ||
5bd6e8b3 | 653 | dev = file->private_data; |
3cfb4842 | 654 | if (!dev) |
946b960d | 655 | return -ENODEV; |
946b960d | 656 | |
549e8350 | 657 | dev_dbg(&dev->interface->dev, "minor %d\n", dev->minor); |
946b960d GKH |
658 | |
659 | /* lock our device */ | |
660 | mutex_lock(&dev->mutex); | |
661 | ||
662 | if (dev->opened <= 0) { | |
663 | retval = -ENODEV; /* close called more than once */ | |
664 | mutex_unlock(&dev->mutex); | |
665 | } else { | |
a895d57d | 666 | dev->opened = 0; /* we're closing now */ |
946b960d GKH |
667 | retval = 0; |
668 | if (dev->present) { | |
669 | /* | |
670 | The device is still connected so we only shutdown | |
671 | pending read-/write-ops. | |
672 | */ | |
673 | usb_kill_urb(dev->int_in_urb); | |
674 | wake_up_interruptible(&dev->read_wait); | |
675 | wake_up_interruptible(&dev->write_wait); | |
676 | mutex_unlock(&dev->mutex); | |
677 | } else { | |
678 | /* The device was unplugged, cleanup resources */ | |
679 | mutex_unlock(&dev->mutex); | |
680 | iowarrior_delete(dev); | |
681 | } | |
682 | } | |
683 | return retval; | |
684 | } | |
685 | ||
686 | static unsigned iowarrior_poll(struct file *file, poll_table * wait) | |
687 | { | |
688 | struct iowarrior *dev = file->private_data; | |
689 | unsigned int mask = 0; | |
690 | ||
691 | if (!dev->present) | |
692 | return POLLERR | POLLHUP; | |
693 | ||
694 | poll_wait(file, &dev->read_wait, wait); | |
695 | poll_wait(file, &dev->write_wait, wait); | |
696 | ||
697 | if (!dev->present) | |
698 | return POLLERR | POLLHUP; | |
699 | ||
700 | if (read_index(dev) != -1) | |
701 | mask |= POLLIN | POLLRDNORM; | |
702 | ||
703 | if (atomic_read(&dev->write_busy) < MAX_WRITES_IN_FLIGHT) | |
704 | mask |= POLLOUT | POLLWRNORM; | |
705 | return mask; | |
706 | } | |
707 | ||
708 | /* | |
709 | * File operations needed when we register this driver. | |
710 | * This assumes that this driver NEEDS file operations, | |
711 | * of course, which means that the driver is expected | |
712 | * to have a node in the /dev directory. If the USB | |
713 | * device were for a network interface then the driver | |
714 | * would use "struct net_driver" instead, and a serial | |
715 | * device would use "struct tty_driver". | |
716 | */ | |
0b3f5fe6 | 717 | static const struct file_operations iowarrior_fops = { |
946b960d GKH |
718 | .owner = THIS_MODULE, |
719 | .write = iowarrior_write, | |
720 | .read = iowarrior_read, | |
824f16fd | 721 | .unlocked_ioctl = iowarrior_ioctl, |
946b960d GKH |
722 | .open = iowarrior_open, |
723 | .release = iowarrior_release, | |
724 | .poll = iowarrior_poll, | |
6038f373 | 725 | .llseek = noop_llseek, |
946b960d GKH |
726 | }; |
727 | ||
2c9ede55 | 728 | static char *iowarrior_devnode(struct device *dev, umode_t *mode) |
f7a386c5 KS |
729 | { |
730 | return kasprintf(GFP_KERNEL, "usb/%s", dev_name(dev)); | |
731 | } | |
732 | ||
946b960d GKH |
733 | /* |
734 | * usb class driver info in order to get a minor number from the usb core, | |
735 | * and to have the device registered with devfs and the driver core | |
736 | */ | |
737 | static struct usb_class_driver iowarrior_class = { | |
738 | .name = "iowarrior%d", | |
e454cea2 | 739 | .devnode = iowarrior_devnode, |
946b960d GKH |
740 | .fops = &iowarrior_fops, |
741 | .minor_base = IOWARRIOR_MINOR_BASE, | |
742 | }; | |
743 | ||
744 | /*---------------------------------*/ | |
745 | /* probe and disconnect functions */ | |
746 | /*---------------------------------*/ | |
747 | /** | |
748 | * iowarrior_probe | |
749 | * | |
750 | * Called by the usb core when a new device is connected that it thinks | |
751 | * this driver might be interested in. | |
752 | */ | |
753 | static int iowarrior_probe(struct usb_interface *interface, | |
754 | const struct usb_device_id *id) | |
755 | { | |
756 | struct usb_device *udev = interface_to_usbdev(interface); | |
757 | struct iowarrior *dev = NULL; | |
758 | struct usb_host_interface *iface_desc; | |
946b960d | 759 | int retval = -ENOMEM; |
920df8d7 | 760 | int res; |
946b960d | 761 | |
b595076a | 762 | /* allocate memory for our device state and initialize it */ |
946b960d | 763 | dev = kzalloc(sizeof(struct iowarrior), GFP_KERNEL); |
3cfb4842 | 764 | if (!dev) |
946b960d | 765 | return retval; |
946b960d GKH |
766 | |
767 | mutex_init(&dev->mutex); | |
768 | ||
769 | atomic_set(&dev->intr_idx, 0); | |
770 | atomic_set(&dev->read_idx, 0); | |
771 | spin_lock_init(&dev->intr_idx_lock); | |
772 | atomic_set(&dev->overflow_flag, 0); | |
773 | init_waitqueue_head(&dev->read_wait); | |
774 | atomic_set(&dev->write_busy, 0); | |
775 | init_waitqueue_head(&dev->write_wait); | |
776 | ||
777 | dev->udev = udev; | |
778 | dev->interface = interface; | |
779 | ||
780 | iface_desc = interface->cur_altsetting; | |
781 | dev->product_id = le16_to_cpu(udev->descriptor.idProduct); | |
782 | ||
920df8d7 JH |
783 | res = usb_find_last_int_in_endpoint(iface_desc, &dev->int_in_endpoint); |
784 | if (res) { | |
b7321e81 | 785 | dev_err(&interface->dev, "no interrupt-in endpoint found\n"); |
920df8d7 | 786 | retval = res; |
b7321e81 JH |
787 | goto error; |
788 | } | |
789 | ||
de46e566 | 790 | if (dev->product_id == USB_DEVICE_ID_CODEMERCS_IOW56) { |
920df8d7 JH |
791 | res = usb_find_last_int_out_endpoint(iface_desc, |
792 | &dev->int_out_endpoint); | |
793 | if (res) { | |
de46e566 | 794 | dev_err(&interface->dev, "no interrupt-out endpoint found\n"); |
920df8d7 | 795 | retval = res; |
de46e566 JH |
796 | goto error; |
797 | } | |
798 | } | |
799 | ||
a895d57d | 800 | /* we have to check the report_size often, so remember it in the endianness suitable for our machine */ |
29cc8897 | 801 | dev->report_size = usb_endpoint_maxp(dev->int_in_endpoint); |
946b960d GKH |
802 | if ((dev->interface->cur_altsetting->desc.bInterfaceNumber == 0) && |
803 | (dev->product_id == USB_DEVICE_ID_CODEMERCS_IOW56)) | |
804 | /* IOWarrior56 has wMaxPacketSize different from report size */ | |
805 | dev->report_size = 7; | |
806 | ||
807 | /* create the urb and buffer for reading */ | |
808 | dev->int_in_urb = usb_alloc_urb(0, GFP_KERNEL); | |
5656bbb7 | 809 | if (!dev->int_in_urb) |
946b960d | 810 | goto error; |
946b960d | 811 | dev->int_in_buffer = kmalloc(dev->report_size, GFP_KERNEL); |
3cfb4842 | 812 | if (!dev->int_in_buffer) |
946b960d | 813 | goto error; |
946b960d GKH |
814 | usb_fill_int_urb(dev->int_in_urb, dev->udev, |
815 | usb_rcvintpipe(dev->udev, | |
816 | dev->int_in_endpoint->bEndpointAddress), | |
817 | dev->int_in_buffer, dev->report_size, | |
818 | iowarrior_callback, dev, | |
819 | dev->int_in_endpoint->bInterval); | |
820 | /* create an internal buffer for interrupt data from the device */ | |
821 | dev->read_queue = | |
822 | kmalloc(((dev->report_size + 1) * MAX_INTERRUPT_BUFFER), | |
823 | GFP_KERNEL); | |
3cfb4842 | 824 | if (!dev->read_queue) |
946b960d | 825 | goto error; |
946b960d GKH |
826 | /* Get the serial-number of the chip */ |
827 | memset(dev->chip_serial, 0x00, sizeof(dev->chip_serial)); | |
828 | usb_string(udev, udev->descriptor.iSerialNumber, dev->chip_serial, | |
829 | sizeof(dev->chip_serial)); | |
830 | if (strlen(dev->chip_serial) != 8) | |
831 | memset(dev->chip_serial, 0x00, sizeof(dev->chip_serial)); | |
832 | ||
833 | /* Set the idle timeout to 0, if this is interface 0 */ | |
834 | if (dev->interface->cur_altsetting->desc.bInterfaceNumber == 0) { | |
147c5a17 EF |
835 | usb_control_msg(udev, usb_sndctrlpipe(udev, 0), |
836 | 0x0A, | |
837 | USB_TYPE_CLASS | USB_RECIP_INTERFACE, 0, | |
838 | 0, NULL, 0, USB_CTRL_SET_TIMEOUT); | |
946b960d GKH |
839 | } |
840 | /* allow device read and ioctl */ | |
841 | dev->present = 1; | |
842 | ||
843 | /* we can register the device now, as it is ready */ | |
844 | usb_set_intfdata(interface, dev); | |
845 | ||
846 | retval = usb_register_dev(interface, &iowarrior_class); | |
847 | if (retval) { | |
848 | /* something prevented us from registering this driver */ | |
849 | dev_err(&interface->dev, "Not able to get a minor for this device.\n"); | |
850 | usb_set_intfdata(interface, NULL); | |
851 | goto error; | |
852 | } | |
853 | ||
854 | dev->minor = interface->minor; | |
855 | ||
856 | /* let the user know what node this device is now attached to */ | |
857 | dev_info(&interface->dev, "IOWarrior product=0x%x, serial=%s interface=%d " | |
858 | "now attached to iowarrior%d\n", dev->product_id, dev->chip_serial, | |
859 | iface_desc->desc.bInterfaceNumber, dev->minor - IOWARRIOR_MINOR_BASE); | |
860 | return retval; | |
861 | ||
862 | error: | |
863 | iowarrior_delete(dev); | |
864 | return retval; | |
865 | } | |
866 | ||
867 | /** | |
868 | * iowarrior_disconnect | |
869 | * | |
870 | * Called by the usb core when the device is removed from the system. | |
871 | */ | |
872 | static void iowarrior_disconnect(struct usb_interface *interface) | |
873 | { | |
874 | struct iowarrior *dev; | |
875 | int minor; | |
876 | ||
946b960d | 877 | dev = usb_get_intfdata(interface); |
03f36e88 | 878 | mutex_lock(&iowarrior_open_disc_lock); |
946b960d GKH |
879 | usb_set_intfdata(interface, NULL); |
880 | ||
946b960d GKH |
881 | minor = dev->minor; |
882 | ||
883 | /* give back our minor */ | |
884 | usb_deregister_dev(interface, &iowarrior_class); | |
885 | ||
d4ead16f AS |
886 | mutex_lock(&dev->mutex); |
887 | ||
946b960d GKH |
888 | /* prevent device read, write and ioctl */ |
889 | dev->present = 0; | |
890 | ||
891 | mutex_unlock(&dev->mutex); | |
03f36e88 | 892 | mutex_unlock(&iowarrior_open_disc_lock); |
946b960d GKH |
893 | |
894 | if (dev->opened) { | |
895 | /* There is a process that holds a filedescriptor to the device , | |
896 | so we only shutdown read-/write-ops going on. | |
897 | Deleting the device is postponed until close() was called. | |
898 | */ | |
899 | usb_kill_urb(dev->int_in_urb); | |
900 | wake_up_interruptible(&dev->read_wait); | |
901 | wake_up_interruptible(&dev->write_wait); | |
902 | } else { | |
903 | /* no process is using the device, cleanup now */ | |
904 | iowarrior_delete(dev); | |
905 | } | |
946b960d GKH |
906 | |
907 | dev_info(&interface->dev, "I/O-Warror #%d now disconnected\n", | |
908 | minor - IOWARRIOR_MINOR_BASE); | |
909 | } | |
910 | ||
911 | /* usb specific object needed to register this driver with the usb subsystem */ | |
912 | static struct usb_driver iowarrior_driver = { | |
913 | .name = "iowarrior", | |
914 | .probe = iowarrior_probe, | |
915 | .disconnect = iowarrior_disconnect, | |
916 | .id_table = iowarrior_ids, | |
917 | }; | |
918 | ||
65db4305 | 919 | module_usb_driver(iowarrior_driver); |