Commit | Line | Data |
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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> | |
18 | #include <linux/init.h> | |
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 | ||
25 | /* Version Information */ | |
26 | #define DRIVER_VERSION "v0.4.0" | |
27 | #define DRIVER_AUTHOR "Christian Lucht <lucht@codemercs.com>" | |
28 | #define DRIVER_DESC "USB IO-Warrior driver (Linux 2.6.x)" | |
29 | ||
30 | #define USB_VENDOR_ID_CODEMERCS 1984 | |
31 | /* low speed iowarrior */ | |
32 | #define USB_DEVICE_ID_CODEMERCS_IOW40 0x1500 | |
33 | #define USB_DEVICE_ID_CODEMERCS_IOW24 0x1501 | |
34 | #define USB_DEVICE_ID_CODEMERCS_IOWPV1 0x1511 | |
35 | #define USB_DEVICE_ID_CODEMERCS_IOWPV2 0x1512 | |
36 | /* full speed iowarrior */ | |
37 | #define USB_DEVICE_ID_CODEMERCS_IOW56 0x1503 | |
38 | ||
39 | /* Get a minor range for your devices from the usb maintainer */ | |
40 | #ifdef CONFIG_USB_DYNAMIC_MINORS | |
41 | #define IOWARRIOR_MINOR_BASE 0 | |
42 | #else | |
43 | #define IOWARRIOR_MINOR_BASE 208 // SKELETON_MINOR_BASE 192 + 16, not offical yet | |
44 | #endif | |
45 | ||
46 | /* interrupt input queue size */ | |
47 | #define MAX_INTERRUPT_BUFFER 16 | |
48 | /* | |
49 | maximum number of urbs that are submitted for writes at the same time, | |
50 | this applies to the IOWarrior56 only! | |
51 | IOWarrior24 and IOWarrior40 use synchronous usb_control_msg calls. | |
52 | */ | |
53 | #define MAX_WRITES_IN_FLIGHT 4 | |
54 | ||
55 | /* Use our own dbg macro */ | |
56 | #undef dbg | |
57 | #define dbg( format, arg... ) do { if( debug ) printk( KERN_DEBUG __FILE__ ": " format "\n" , ## arg ); } while ( 0 ) | |
58 | ||
59 | MODULE_AUTHOR(DRIVER_AUTHOR); | |
60 | MODULE_DESCRIPTION(DRIVER_DESC); | |
61 | MODULE_LICENSE("GPL"); | |
62 | ||
63 | /* Module parameters */ | |
925ce689 | 64 | static DEFINE_MUTEX(iowarrior_mutex); |
946b960d GKH |
65 | static int debug = 0; |
66 | module_param(debug, bool, 0644); | |
67 | MODULE_PARM_DESC(debug, "debug=1 enables debugging messages"); | |
68 | ||
69 | static struct usb_driver iowarrior_driver; | |
03f36e88 | 70 | static DEFINE_MUTEX(iowarrior_open_disc_lock); |
946b960d GKH |
71 | |
72 | /*--------------*/ | |
73 | /* data */ | |
74 | /*--------------*/ | |
75 | ||
76 | /* Structure to hold all of our device specific stuff */ | |
77 | struct iowarrior { | |
78 | struct mutex mutex; /* locks this structure */ | |
79 | struct usb_device *udev; /* save off the usb device pointer */ | |
80 | struct usb_interface *interface; /* the interface for this device */ | |
81 | unsigned char minor; /* the starting minor number for this device */ | |
82 | struct usb_endpoint_descriptor *int_out_endpoint; /* endpoint for reading (needed for IOW56 only) */ | |
83 | struct usb_endpoint_descriptor *int_in_endpoint; /* endpoint for reading */ | |
84 | struct urb *int_in_urb; /* the urb for reading data */ | |
85 | unsigned char *int_in_buffer; /* buffer for data to be read */ | |
86 | unsigned char serial_number; /* to detect lost packages */ | |
87 | unsigned char *read_queue; /* size is MAX_INTERRUPT_BUFFER * packet size */ | |
88 | wait_queue_head_t read_wait; | |
89 | wait_queue_head_t write_wait; /* wait-queue for writing to the device */ | |
90 | atomic_t write_busy; /* number of write-urbs submitted */ | |
91 | atomic_t read_idx; | |
92 | atomic_t intr_idx; | |
93 | spinlock_t intr_idx_lock; /* protects intr_idx */ | |
94 | atomic_t overflow_flag; /* signals an index 'rollover' */ | |
95 | int present; /* this is 1 as long as the device is connected */ | |
96 | int opened; /* this is 1 if the device is currently open */ | |
97 | char chip_serial[9]; /* the serial number string of the chip connected */ | |
98 | int report_size; /* number of bytes in a report */ | |
99 | u16 product_id; | |
100 | }; | |
101 | ||
102 | /*--------------*/ | |
103 | /* globals */ | |
104 | /*--------------*/ | |
946b960d GKH |
105 | |
106 | /* | |
107 | * USB spec identifies 5 second timeouts. | |
108 | */ | |
109 | #define GET_TIMEOUT 5 | |
110 | #define USB_REQ_GET_REPORT 0x01 | |
111 | //#if 0 | |
112 | static int usb_get_report(struct usb_device *dev, | |
113 | struct usb_host_interface *inter, unsigned char type, | |
114 | unsigned char id, void *buf, int size) | |
115 | { | |
116 | return usb_control_msg(dev, usb_rcvctrlpipe(dev, 0), | |
117 | USB_REQ_GET_REPORT, | |
118 | USB_DIR_IN | USB_TYPE_CLASS | | |
119 | USB_RECIP_INTERFACE, (type << 8) + id, | |
120 | inter->desc.bInterfaceNumber, buf, size, | |
147c5a17 | 121 | GET_TIMEOUT*HZ); |
946b960d GKH |
122 | } |
123 | //#endif | |
124 | ||
125 | #define USB_REQ_SET_REPORT 0x09 | |
126 | ||
127 | static int usb_set_report(struct usb_interface *intf, unsigned char type, | |
128 | unsigned char id, void *buf, int size) | |
129 | { | |
130 | return usb_control_msg(interface_to_usbdev(intf), | |
131 | usb_sndctrlpipe(interface_to_usbdev(intf), 0), | |
132 | USB_REQ_SET_REPORT, | |
133 | USB_TYPE_CLASS | USB_RECIP_INTERFACE, | |
134 | (type << 8) + id, | |
135 | intf->cur_altsetting->desc.bInterfaceNumber, buf, | |
147c5a17 | 136 | size, HZ); |
946b960d GKH |
137 | } |
138 | ||
139 | /*---------------------*/ | |
140 | /* driver registration */ | |
141 | /*---------------------*/ | |
142 | /* table of devices that work with this driver */ | |
33b9e162 | 143 | static const struct usb_device_id iowarrior_ids[] = { |
946b960d GKH |
144 | {USB_DEVICE(USB_VENDOR_ID_CODEMERCS, USB_DEVICE_ID_CODEMERCS_IOW40)}, |
145 | {USB_DEVICE(USB_VENDOR_ID_CODEMERCS, USB_DEVICE_ID_CODEMERCS_IOW24)}, | |
146 | {USB_DEVICE(USB_VENDOR_ID_CODEMERCS, USB_DEVICE_ID_CODEMERCS_IOWPV1)}, | |
147 | {USB_DEVICE(USB_VENDOR_ID_CODEMERCS, USB_DEVICE_ID_CODEMERCS_IOWPV2)}, | |
148 | {USB_DEVICE(USB_VENDOR_ID_CODEMERCS, USB_DEVICE_ID_CODEMERCS_IOW56)}, | |
149 | {} /* Terminating entry */ | |
150 | }; | |
151 | MODULE_DEVICE_TABLE(usb, iowarrior_ids); | |
152 | ||
153 | /* | |
154 | * USB callback handler for reading data | |
155 | */ | |
156 | static void iowarrior_callback(struct urb *urb) | |
157 | { | |
cdc97792 | 158 | struct iowarrior *dev = urb->context; |
946b960d GKH |
159 | int intr_idx; |
160 | int read_idx; | |
161 | int aux_idx; | |
162 | int offset; | |
fb3abee6 GKH |
163 | int status = urb->status; |
164 | int retval; | |
946b960d | 165 | |
fb3abee6 | 166 | switch (status) { |
946b960d GKH |
167 | case 0: |
168 | /* success */ | |
169 | break; | |
170 | case -ECONNRESET: | |
171 | case -ENOENT: | |
172 | case -ESHUTDOWN: | |
173 | return; | |
174 | default: | |
175 | goto exit; | |
176 | } | |
177 | ||
178 | spin_lock(&dev->intr_idx_lock); | |
179 | intr_idx = atomic_read(&dev->intr_idx); | |
180 | /* aux_idx become previous intr_idx */ | |
181 | aux_idx = (intr_idx == 0) ? (MAX_INTERRUPT_BUFFER - 1) : (intr_idx - 1); | |
182 | read_idx = atomic_read(&dev->read_idx); | |
183 | ||
184 | /* queue is not empty and it's interface 0 */ | |
185 | if ((intr_idx != read_idx) | |
186 | && (dev->interface->cur_altsetting->desc.bInterfaceNumber == 0)) { | |
187 | /* + 1 for serial number */ | |
188 | offset = aux_idx * (dev->report_size + 1); | |
189 | if (!memcmp | |
190 | (dev->read_queue + offset, urb->transfer_buffer, | |
191 | dev->report_size)) { | |
192 | /* equal values on interface 0 will be ignored */ | |
193 | spin_unlock(&dev->intr_idx_lock); | |
194 | goto exit; | |
195 | } | |
196 | } | |
197 | ||
198 | /* aux_idx become next intr_idx */ | |
199 | aux_idx = (intr_idx == (MAX_INTERRUPT_BUFFER - 1)) ? 0 : (intr_idx + 1); | |
200 | if (read_idx == aux_idx) { | |
201 | /* queue full, dropping oldest input */ | |
202 | read_idx = (++read_idx == MAX_INTERRUPT_BUFFER) ? 0 : read_idx; | |
203 | atomic_set(&dev->read_idx, read_idx); | |
204 | atomic_set(&dev->overflow_flag, 1); | |
205 | } | |
206 | ||
207 | /* +1 for serial number */ | |
208 | offset = intr_idx * (dev->report_size + 1); | |
209 | memcpy(dev->read_queue + offset, urb->transfer_buffer, | |
210 | dev->report_size); | |
211 | *(dev->read_queue + offset + (dev->report_size)) = dev->serial_number++; | |
212 | ||
213 | atomic_set(&dev->intr_idx, aux_idx); | |
214 | spin_unlock(&dev->intr_idx_lock); | |
215 | /* tell the blocking read about the new data */ | |
216 | wake_up_interruptible(&dev->read_wait); | |
217 | ||
218 | exit: | |
fb3abee6 GKH |
219 | retval = usb_submit_urb(urb, GFP_ATOMIC); |
220 | if (retval) | |
898eb71c | 221 | dev_err(&dev->interface->dev, "%s - usb_submit_urb failed with result %d\n", |
441b62c1 | 222 | __func__, retval); |
946b960d GKH |
223 | |
224 | } | |
225 | ||
226 | /* | |
227 | * USB Callback handler for write-ops | |
228 | */ | |
229 | static void iowarrior_write_callback(struct urb *urb) | |
230 | { | |
231 | struct iowarrior *dev; | |
fb3abee6 GKH |
232 | int status = urb->status; |
233 | ||
cdc97792 | 234 | dev = urb->context; |
946b960d | 235 | /* sync/async unlink faults aren't errors */ |
fb3abee6 GKH |
236 | if (status && |
237 | !(status == -ENOENT || | |
238 | status == -ECONNRESET || status == -ESHUTDOWN)) { | |
946b960d | 239 | dbg("%s - nonzero write bulk status received: %d", |
fb3abee6 | 240 | __func__, status); |
946b960d GKH |
241 | } |
242 | /* free up our allocated buffer */ | |
997ea58e DM |
243 | usb_free_coherent(urb->dev, urb->transfer_buffer_length, |
244 | urb->transfer_buffer, urb->transfer_dma); | |
946b960d GKH |
245 | /* tell a waiting writer the interrupt-out-pipe is available again */ |
246 | atomic_dec(&dev->write_busy); | |
247 | wake_up_interruptible(&dev->write_wait); | |
248 | } | |
249 | ||
250 | /** | |
251 | * iowarrior_delete | |
252 | */ | |
253 | static inline void iowarrior_delete(struct iowarrior *dev) | |
254 | { | |
255 | dbg("%s - minor %d", __func__, dev->minor); | |
256 | kfree(dev->int_in_buffer); | |
257 | usb_free_urb(dev->int_in_urb); | |
258 | kfree(dev->read_queue); | |
259 | kfree(dev); | |
260 | } | |
261 | ||
262 | /*---------------------*/ | |
263 | /* fops implementation */ | |
264 | /*---------------------*/ | |
265 | ||
266 | static int read_index(struct iowarrior *dev) | |
267 | { | |
268 | int intr_idx, read_idx; | |
269 | ||
270 | read_idx = atomic_read(&dev->read_idx); | |
271 | intr_idx = atomic_read(&dev->intr_idx); | |
272 | ||
273 | return (read_idx == intr_idx ? -1 : read_idx); | |
274 | } | |
275 | ||
276 | /** | |
277 | * iowarrior_read | |
278 | */ | |
279 | static ssize_t iowarrior_read(struct file *file, char __user *buffer, | |
280 | size_t count, loff_t *ppos) | |
281 | { | |
282 | struct iowarrior *dev; | |
283 | int read_idx; | |
284 | int offset; | |
285 | ||
5bd6e8b3 | 286 | dev = file->private_data; |
946b960d GKH |
287 | |
288 | /* verify that the device wasn't unplugged */ | |
289 | if (dev == NULL || !dev->present) | |
290 | return -ENODEV; | |
291 | ||
292 | dbg("%s - minor %d, count = %zd", __func__, dev->minor, count); | |
293 | ||
294 | /* read count must be packet size (+ time stamp) */ | |
295 | if ((count != dev->report_size) | |
296 | && (count != (dev->report_size + 1))) | |
297 | return -EINVAL; | |
298 | ||
299 | /* repeat until no buffer overrun in callback handler occur */ | |
300 | do { | |
301 | atomic_set(&dev->overflow_flag, 0); | |
302 | if ((read_idx = read_index(dev)) == -1) { | |
303 | /* queue emty */ | |
304 | if (file->f_flags & O_NONBLOCK) | |
305 | return -EAGAIN; | |
306 | else { | |
307 | //next line will return when there is either new data, or the device is unplugged | |
308 | int r = wait_event_interruptible(dev->read_wait, | |
309 | (!dev->present | |
310 | || (read_idx = | |
311 | read_index | |
312 | (dev)) != | |
313 | -1)); | |
314 | if (r) { | |
315 | //we were interrupted by a signal | |
316 | return -ERESTART; | |
317 | } | |
318 | if (!dev->present) { | |
319 | //The device was unplugged | |
320 | return -ENODEV; | |
321 | } | |
322 | if (read_idx == -1) { | |
323 | // Can this happen ??? | |
324 | return 0; | |
325 | } | |
326 | } | |
327 | } | |
328 | ||
329 | offset = read_idx * (dev->report_size + 1); | |
330 | if (copy_to_user(buffer, dev->read_queue + offset, count)) { | |
331 | return -EFAULT; | |
332 | } | |
333 | } while (atomic_read(&dev->overflow_flag)); | |
334 | ||
335 | read_idx = ++read_idx == MAX_INTERRUPT_BUFFER ? 0 : read_idx; | |
336 | atomic_set(&dev->read_idx, read_idx); | |
337 | return count; | |
338 | } | |
339 | ||
340 | /* | |
341 | * iowarrior_write | |
342 | */ | |
343 | static ssize_t iowarrior_write(struct file *file, | |
344 | const char __user *user_buffer, | |
345 | size_t count, loff_t *ppos) | |
346 | { | |
347 | struct iowarrior *dev; | |
348 | int retval = 0; | |
349 | char *buf = NULL; /* for IOW24 and IOW56 we need a buffer */ | |
350 | struct urb *int_out_urb = NULL; | |
351 | ||
5bd6e8b3 | 352 | dev = file->private_data; |
946b960d GKH |
353 | |
354 | mutex_lock(&dev->mutex); | |
355 | /* verify that the device wasn't unplugged */ | |
e28c6a77 | 356 | if (!dev->present) { |
946b960d GKH |
357 | retval = -ENODEV; |
358 | goto exit; | |
359 | } | |
360 | dbg("%s - minor %d, count = %zd", __func__, dev->minor, count); | |
361 | /* if count is 0 we're already done */ | |
362 | if (count == 0) { | |
363 | retval = 0; | |
364 | goto exit; | |
365 | } | |
366 | /* We only accept full reports */ | |
367 | if (count != dev->report_size) { | |
368 | retval = -EINVAL; | |
369 | goto exit; | |
370 | } | |
371 | switch (dev->product_id) { | |
372 | case USB_DEVICE_ID_CODEMERCS_IOW24: | |
373 | case USB_DEVICE_ID_CODEMERCS_IOWPV1: | |
374 | case USB_DEVICE_ID_CODEMERCS_IOWPV2: | |
375 | case USB_DEVICE_ID_CODEMERCS_IOW40: | |
376 | /* IOW24 and IOW40 use a synchronous call */ | |
3ed78011 | 377 | buf = kmalloc(count, GFP_KERNEL); |
946b960d GKH |
378 | if (!buf) { |
379 | retval = -ENOMEM; | |
380 | goto exit; | |
381 | } | |
382 | if (copy_from_user(buf, user_buffer, count)) { | |
383 | retval = -EFAULT; | |
384 | kfree(buf); | |
385 | goto exit; | |
386 | } | |
387 | retval = usb_set_report(dev->interface, 2, 0, buf, count); | |
388 | kfree(buf); | |
389 | goto exit; | |
390 | break; | |
391 | case USB_DEVICE_ID_CODEMERCS_IOW56: | |
392 | /* The IOW56 uses asynchronous IO and more urbs */ | |
393 | if (atomic_read(&dev->write_busy) == MAX_WRITES_IN_FLIGHT) { | |
394 | /* Wait until we are below the limit for submitted urbs */ | |
395 | if (file->f_flags & O_NONBLOCK) { | |
396 | retval = -EAGAIN; | |
397 | goto exit; | |
398 | } else { | |
399 | retval = wait_event_interruptible(dev->write_wait, | |
400 | (!dev->present || (atomic_read (&dev-> write_busy) < MAX_WRITES_IN_FLIGHT))); | |
401 | if (retval) { | |
402 | /* we were interrupted by a signal */ | |
403 | retval = -ERESTART; | |
404 | goto exit; | |
405 | } | |
406 | if (!dev->present) { | |
407 | /* The device was unplugged */ | |
408 | retval = -ENODEV; | |
409 | goto exit; | |
410 | } | |
411 | if (!dev->opened) { | |
412 | /* We were closed while waiting for an URB */ | |
413 | retval = -ENODEV; | |
414 | goto exit; | |
415 | } | |
416 | } | |
417 | } | |
418 | atomic_inc(&dev->write_busy); | |
419 | int_out_urb = usb_alloc_urb(0, GFP_KERNEL); | |
420 | if (!int_out_urb) { | |
421 | retval = -ENOMEM; | |
422 | dbg("%s Unable to allocate urb ", __func__); | |
f81ee4d5 | 423 | goto error_no_urb; |
946b960d | 424 | } |
997ea58e DM |
425 | buf = usb_alloc_coherent(dev->udev, dev->report_size, |
426 | GFP_KERNEL, &int_out_urb->transfer_dma); | |
946b960d GKH |
427 | if (!buf) { |
428 | retval = -ENOMEM; | |
429 | dbg("%s Unable to allocate buffer ", __func__); | |
f81ee4d5 | 430 | goto error_no_buffer; |
946b960d GKH |
431 | } |
432 | usb_fill_int_urb(int_out_urb, dev->udev, | |
433 | usb_sndintpipe(dev->udev, | |
434 | dev->int_out_endpoint->bEndpointAddress), | |
435 | buf, dev->report_size, | |
436 | iowarrior_write_callback, dev, | |
437 | dev->int_out_endpoint->bInterval); | |
438 | int_out_urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP; | |
439 | if (copy_from_user(buf, user_buffer, count)) { | |
440 | retval = -EFAULT; | |
441 | goto error; | |
442 | } | |
443 | retval = usb_submit_urb(int_out_urb, GFP_KERNEL); | |
444 | if (retval) { | |
445 | dbg("%s submit error %d for urb nr.%d", __func__, | |
446 | retval, atomic_read(&dev->write_busy)); | |
447 | goto error; | |
448 | } | |
449 | /* submit was ok */ | |
450 | retval = count; | |
451 | usb_free_urb(int_out_urb); | |
452 | goto exit; | |
453 | break; | |
454 | default: | |
455 | /* what do we have here ? An unsupported Product-ID ? */ | |
898eb71c | 456 | dev_err(&dev->interface->dev, "%s - not supported for product=0x%x\n", |
441b62c1 | 457 | __func__, dev->product_id); |
946b960d GKH |
458 | retval = -EFAULT; |
459 | goto exit; | |
460 | break; | |
461 | } | |
462 | error: | |
997ea58e DM |
463 | usb_free_coherent(dev->udev, dev->report_size, buf, |
464 | int_out_urb->transfer_dma); | |
f81ee4d5 | 465 | error_no_buffer: |
946b960d | 466 | usb_free_urb(int_out_urb); |
f81ee4d5 | 467 | error_no_urb: |
946b960d GKH |
468 | atomic_dec(&dev->write_busy); |
469 | wake_up_interruptible(&dev->write_wait); | |
470 | exit: | |
471 | mutex_unlock(&dev->mutex); | |
472 | return retval; | |
473 | } | |
474 | ||
475 | /** | |
476 | * iowarrior_ioctl | |
477 | */ | |
824f16fd AC |
478 | static long iowarrior_ioctl(struct file *file, unsigned int cmd, |
479 | unsigned long arg) | |
946b960d GKH |
480 | { |
481 | struct iowarrior *dev = NULL; | |
482 | __u8 *buffer; | |
483 | __u8 __user *user_buffer; | |
484 | int retval; | |
485 | int io_res; /* checks for bytes read/written and copy_to/from_user results */ | |
486 | ||
5bd6e8b3 | 487 | dev = file->private_data; |
946b960d GKH |
488 | if (dev == NULL) { |
489 | return -ENODEV; | |
490 | } | |
491 | ||
492 | buffer = kzalloc(dev->report_size, GFP_KERNEL); | |
493 | if (!buffer) | |
494 | return -ENOMEM; | |
495 | ||
496 | /* lock this object */ | |
925ce689 | 497 | mutex_lock(&iowarrior_mutex); |
946b960d GKH |
498 | mutex_lock(&dev->mutex); |
499 | ||
500 | /* verify that the device wasn't unplugged */ | |
501 | if (!dev->present) { | |
fc0f8fc9 ON |
502 | retval = -ENODEV; |
503 | goto error_out; | |
946b960d GKH |
504 | } |
505 | ||
506 | dbg("%s - minor %d, cmd 0x%.4x, arg %ld", __func__, dev->minor, cmd, | |
507 | arg); | |
508 | ||
509 | retval = 0; | |
510 | io_res = 0; | |
511 | switch (cmd) { | |
512 | case IOW_WRITE: | |
513 | if (dev->product_id == USB_DEVICE_ID_CODEMERCS_IOW24 || | |
514 | dev->product_id == USB_DEVICE_ID_CODEMERCS_IOWPV1 || | |
515 | dev->product_id == USB_DEVICE_ID_CODEMERCS_IOWPV2 || | |
516 | dev->product_id == USB_DEVICE_ID_CODEMERCS_IOW40) { | |
517 | user_buffer = (__u8 __user *)arg; | |
518 | io_res = copy_from_user(buffer, user_buffer, | |
519 | dev->report_size); | |
520 | if (io_res) { | |
521 | retval = -EFAULT; | |
522 | } else { | |
523 | io_res = usb_set_report(dev->interface, 2, 0, | |
524 | buffer, | |
525 | dev->report_size); | |
526 | if (io_res < 0) | |
527 | retval = io_res; | |
528 | } | |
529 | } else { | |
530 | retval = -EINVAL; | |
531 | dev_err(&dev->interface->dev, | |
898eb71c | 532 | "ioctl 'IOW_WRITE' is not supported for product=0x%x.\n", |
946b960d GKH |
533 | dev->product_id); |
534 | } | |
535 | break; | |
536 | case IOW_READ: | |
537 | user_buffer = (__u8 __user *)arg; | |
538 | io_res = usb_get_report(dev->udev, | |
539 | dev->interface->cur_altsetting, 1, 0, | |
540 | buffer, dev->report_size); | |
541 | if (io_res < 0) | |
542 | retval = io_res; | |
543 | else { | |
544 | io_res = copy_to_user(user_buffer, buffer, dev->report_size); | |
6d4d4554 | 545 | if (io_res) |
946b960d GKH |
546 | retval = -EFAULT; |
547 | } | |
548 | break; | |
549 | case IOW_GETINFO: | |
550 | { | |
551 | /* Report available information for the device */ | |
552 | struct iowarrior_info info; | |
553 | /* needed for power consumption */ | |
554 | struct usb_config_descriptor *cfg_descriptor = &dev->udev->actconfig->desc; | |
555 | ||
556 | /* directly from the descriptor */ | |
557 | info.vendor = le16_to_cpu(dev->udev->descriptor.idVendor); | |
558 | info.product = dev->product_id; | |
559 | info.revision = le16_to_cpu(dev->udev->descriptor.bcdDevice); | |
560 | ||
561 | /* 0==UNKNOWN, 1==LOW(usb1.1) ,2=FULL(usb1.1), 3=HIGH(usb2.0) */ | |
562 | info.speed = le16_to_cpu(dev->udev->speed); | |
563 | info.if_num = dev->interface->cur_altsetting->desc.bInterfaceNumber; | |
564 | info.report_size = dev->report_size; | |
565 | ||
566 | /* serial number string has been read earlier 8 chars or empty string */ | |
567 | memcpy(info.serial, dev->chip_serial, | |
568 | sizeof(dev->chip_serial)); | |
569 | if (cfg_descriptor == NULL) { | |
570 | info.power = -1; /* no information available */ | |
571 | } else { | |
572 | /* the MaxPower is stored in units of 2mA to make it fit into a byte-value */ | |
573 | info.power = cfg_descriptor->bMaxPower * 2; | |
574 | } | |
575 | io_res = copy_to_user((struct iowarrior_info __user *)arg, &info, | |
576 | sizeof(struct iowarrior_info)); | |
6d4d4554 | 577 | if (io_res) |
946b960d GKH |
578 | retval = -EFAULT; |
579 | break; | |
580 | } | |
581 | default: | |
582 | /* return that we did not understand this ioctl call */ | |
583 | retval = -ENOTTY; | |
584 | break; | |
585 | } | |
fc0f8fc9 | 586 | error_out: |
946b960d GKH |
587 | /* unlock the device */ |
588 | mutex_unlock(&dev->mutex); | |
925ce689 | 589 | mutex_unlock(&iowarrior_mutex); |
fc0f8fc9 | 590 | kfree(buffer); |
946b960d GKH |
591 | return retval; |
592 | } | |
593 | ||
594 | /** | |
595 | * iowarrior_open | |
596 | */ | |
597 | static int iowarrior_open(struct inode *inode, struct file *file) | |
598 | { | |
599 | struct iowarrior *dev = NULL; | |
600 | struct usb_interface *interface; | |
601 | int subminor; | |
602 | int retval = 0; | |
603 | ||
604 | dbg("%s", __func__); | |
605 | ||
925ce689 | 606 | mutex_lock(&iowarrior_mutex); |
946b960d GKH |
607 | subminor = iminor(inode); |
608 | ||
946b960d GKH |
609 | interface = usb_find_interface(&iowarrior_driver, subminor); |
610 | if (!interface) { | |
925ce689 | 611 | mutex_unlock(&iowarrior_mutex); |
441b62c1 | 612 | err("%s - error, can't find device for minor %d", __func__, |
946b960d | 613 | subminor); |
d4ead16f | 614 | return -ENODEV; |
946b960d GKH |
615 | } |
616 | ||
03f36e88 | 617 | mutex_lock(&iowarrior_open_disc_lock); |
946b960d | 618 | dev = usb_get_intfdata(interface); |
03f36e88 ON |
619 | if (!dev) { |
620 | mutex_unlock(&iowarrior_open_disc_lock); | |
925ce689 | 621 | mutex_unlock(&iowarrior_mutex); |
d4ead16f | 622 | return -ENODEV; |
03f36e88 | 623 | } |
d4ead16f AS |
624 | |
625 | mutex_lock(&dev->mutex); | |
03f36e88 | 626 | mutex_unlock(&iowarrior_open_disc_lock); |
946b960d GKH |
627 | |
628 | /* Only one process can open each device, no sharing. */ | |
629 | if (dev->opened) { | |
630 | retval = -EBUSY; | |
631 | goto out; | |
632 | } | |
633 | ||
634 | /* setup interrupt handler for receiving values */ | |
635 | if ((retval = usb_submit_urb(dev->int_in_urb, GFP_KERNEL)) < 0) { | |
636 | dev_err(&interface->dev, "Error %d while submitting URB\n", retval); | |
637 | retval = -EFAULT; | |
638 | goto out; | |
639 | } | |
640 | /* increment our usage count for the driver */ | |
641 | ++dev->opened; | |
642 | /* save our object in the file's private structure */ | |
643 | file->private_data = dev; | |
644 | retval = 0; | |
645 | ||
646 | out: | |
d4ead16f | 647 | mutex_unlock(&dev->mutex); |
925ce689 | 648 | mutex_unlock(&iowarrior_mutex); |
946b960d GKH |
649 | return retval; |
650 | } | |
651 | ||
652 | /** | |
653 | * iowarrior_release | |
654 | */ | |
655 | static int iowarrior_release(struct inode *inode, struct file *file) | |
656 | { | |
657 | struct iowarrior *dev; | |
658 | int retval = 0; | |
659 | ||
5bd6e8b3 | 660 | dev = file->private_data; |
946b960d GKH |
661 | if (dev == NULL) { |
662 | return -ENODEV; | |
663 | } | |
664 | ||
665 | dbg("%s - minor %d", __func__, dev->minor); | |
666 | ||
667 | /* lock our device */ | |
668 | mutex_lock(&dev->mutex); | |
669 | ||
670 | if (dev->opened <= 0) { | |
671 | retval = -ENODEV; /* close called more than once */ | |
672 | mutex_unlock(&dev->mutex); | |
673 | } else { | |
674 | dev->opened = 0; /* we're closeing now */ | |
675 | retval = 0; | |
676 | if (dev->present) { | |
677 | /* | |
678 | The device is still connected so we only shutdown | |
679 | pending read-/write-ops. | |
680 | */ | |
681 | usb_kill_urb(dev->int_in_urb); | |
682 | wake_up_interruptible(&dev->read_wait); | |
683 | wake_up_interruptible(&dev->write_wait); | |
684 | mutex_unlock(&dev->mutex); | |
685 | } else { | |
686 | /* The device was unplugged, cleanup resources */ | |
687 | mutex_unlock(&dev->mutex); | |
688 | iowarrior_delete(dev); | |
689 | } | |
690 | } | |
691 | return retval; | |
692 | } | |
693 | ||
694 | static unsigned iowarrior_poll(struct file *file, poll_table * wait) | |
695 | { | |
696 | struct iowarrior *dev = file->private_data; | |
697 | unsigned int mask = 0; | |
698 | ||
699 | if (!dev->present) | |
700 | return POLLERR | POLLHUP; | |
701 | ||
702 | poll_wait(file, &dev->read_wait, wait); | |
703 | poll_wait(file, &dev->write_wait, wait); | |
704 | ||
705 | if (!dev->present) | |
706 | return POLLERR | POLLHUP; | |
707 | ||
708 | if (read_index(dev) != -1) | |
709 | mask |= POLLIN | POLLRDNORM; | |
710 | ||
711 | if (atomic_read(&dev->write_busy) < MAX_WRITES_IN_FLIGHT) | |
712 | mask |= POLLOUT | POLLWRNORM; | |
713 | return mask; | |
714 | } | |
715 | ||
716 | /* | |
717 | * File operations needed when we register this driver. | |
718 | * This assumes that this driver NEEDS file operations, | |
719 | * of course, which means that the driver is expected | |
720 | * to have a node in the /dev directory. If the USB | |
721 | * device were for a network interface then the driver | |
722 | * would use "struct net_driver" instead, and a serial | |
723 | * device would use "struct tty_driver". | |
724 | */ | |
0b3f5fe6 | 725 | static const struct file_operations iowarrior_fops = { |
946b960d GKH |
726 | .owner = THIS_MODULE, |
727 | .write = iowarrior_write, | |
728 | .read = iowarrior_read, | |
824f16fd | 729 | .unlocked_ioctl = iowarrior_ioctl, |
946b960d GKH |
730 | .open = iowarrior_open, |
731 | .release = iowarrior_release, | |
732 | .poll = iowarrior_poll, | |
6038f373 | 733 | .llseek = noop_llseek, |
946b960d GKH |
734 | }; |
735 | ||
e454cea2 | 736 | static char *iowarrior_devnode(struct device *dev, mode_t *mode) |
f7a386c5 KS |
737 | { |
738 | return kasprintf(GFP_KERNEL, "usb/%s", dev_name(dev)); | |
739 | } | |
740 | ||
946b960d GKH |
741 | /* |
742 | * usb class driver info in order to get a minor number from the usb core, | |
743 | * and to have the device registered with devfs and the driver core | |
744 | */ | |
745 | static struct usb_class_driver iowarrior_class = { | |
746 | .name = "iowarrior%d", | |
e454cea2 | 747 | .devnode = iowarrior_devnode, |
946b960d GKH |
748 | .fops = &iowarrior_fops, |
749 | .minor_base = IOWARRIOR_MINOR_BASE, | |
750 | }; | |
751 | ||
752 | /*---------------------------------*/ | |
753 | /* probe and disconnect functions */ | |
754 | /*---------------------------------*/ | |
755 | /** | |
756 | * iowarrior_probe | |
757 | * | |
758 | * Called by the usb core when a new device is connected that it thinks | |
759 | * this driver might be interested in. | |
760 | */ | |
761 | static int iowarrior_probe(struct usb_interface *interface, | |
762 | const struct usb_device_id *id) | |
763 | { | |
764 | struct usb_device *udev = interface_to_usbdev(interface); | |
765 | struct iowarrior *dev = NULL; | |
766 | struct usb_host_interface *iface_desc; | |
767 | struct usb_endpoint_descriptor *endpoint; | |
768 | int i; | |
769 | int retval = -ENOMEM; | |
946b960d GKH |
770 | |
771 | /* allocate memory for our device state and intialize it */ | |
772 | dev = kzalloc(sizeof(struct iowarrior), GFP_KERNEL); | |
773 | if (dev == NULL) { | |
898eb71c | 774 | dev_err(&interface->dev, "Out of memory\n"); |
946b960d GKH |
775 | return retval; |
776 | } | |
777 | ||
778 | mutex_init(&dev->mutex); | |
779 | ||
780 | atomic_set(&dev->intr_idx, 0); | |
781 | atomic_set(&dev->read_idx, 0); | |
782 | spin_lock_init(&dev->intr_idx_lock); | |
783 | atomic_set(&dev->overflow_flag, 0); | |
784 | init_waitqueue_head(&dev->read_wait); | |
785 | atomic_set(&dev->write_busy, 0); | |
786 | init_waitqueue_head(&dev->write_wait); | |
787 | ||
788 | dev->udev = udev; | |
789 | dev->interface = interface; | |
790 | ||
791 | iface_desc = interface->cur_altsetting; | |
792 | dev->product_id = le16_to_cpu(udev->descriptor.idProduct); | |
793 | ||
794 | /* set up the endpoint information */ | |
795 | for (i = 0; i < iface_desc->desc.bNumEndpoints; ++i) { | |
796 | endpoint = &iface_desc->endpoint[i].desc; | |
797 | ||
798 | if (usb_endpoint_is_int_in(endpoint)) | |
799 | dev->int_in_endpoint = endpoint; | |
800 | if (usb_endpoint_is_int_out(endpoint)) | |
801 | /* this one will match for the IOWarrior56 only */ | |
802 | dev->int_out_endpoint = endpoint; | |
803 | } | |
804 | /* we have to check the report_size often, so remember it in the endianess suitable for our machine */ | |
805 | dev->report_size = le16_to_cpu(dev->int_in_endpoint->wMaxPacketSize); | |
806 | if ((dev->interface->cur_altsetting->desc.bInterfaceNumber == 0) && | |
807 | (dev->product_id == USB_DEVICE_ID_CODEMERCS_IOW56)) | |
808 | /* IOWarrior56 has wMaxPacketSize different from report size */ | |
809 | dev->report_size = 7; | |
810 | ||
811 | /* create the urb and buffer for reading */ | |
812 | dev->int_in_urb = usb_alloc_urb(0, GFP_KERNEL); | |
813 | if (!dev->int_in_urb) { | |
814 | dev_err(&interface->dev, "Couldn't allocate interrupt_in_urb\n"); | |
815 | goto error; | |
816 | } | |
817 | dev->int_in_buffer = kmalloc(dev->report_size, GFP_KERNEL); | |
818 | if (!dev->int_in_buffer) { | |
819 | dev_err(&interface->dev, "Couldn't allocate int_in_buffer\n"); | |
820 | goto error; | |
821 | } | |
822 | usb_fill_int_urb(dev->int_in_urb, dev->udev, | |
823 | usb_rcvintpipe(dev->udev, | |
824 | dev->int_in_endpoint->bEndpointAddress), | |
825 | dev->int_in_buffer, dev->report_size, | |
826 | iowarrior_callback, dev, | |
827 | dev->int_in_endpoint->bInterval); | |
828 | /* create an internal buffer for interrupt data from the device */ | |
829 | dev->read_queue = | |
830 | kmalloc(((dev->report_size + 1) * MAX_INTERRUPT_BUFFER), | |
831 | GFP_KERNEL); | |
832 | if (!dev->read_queue) { | |
833 | dev_err(&interface->dev, "Couldn't allocate read_queue\n"); | |
834 | goto error; | |
835 | } | |
836 | /* Get the serial-number of the chip */ | |
837 | memset(dev->chip_serial, 0x00, sizeof(dev->chip_serial)); | |
838 | usb_string(udev, udev->descriptor.iSerialNumber, dev->chip_serial, | |
839 | sizeof(dev->chip_serial)); | |
840 | if (strlen(dev->chip_serial) != 8) | |
841 | memset(dev->chip_serial, 0x00, sizeof(dev->chip_serial)); | |
842 | ||
843 | /* Set the idle timeout to 0, if this is interface 0 */ | |
844 | if (dev->interface->cur_altsetting->desc.bInterfaceNumber == 0) { | |
147c5a17 EF |
845 | usb_control_msg(udev, usb_sndctrlpipe(udev, 0), |
846 | 0x0A, | |
847 | USB_TYPE_CLASS | USB_RECIP_INTERFACE, 0, | |
848 | 0, NULL, 0, USB_CTRL_SET_TIMEOUT); | |
946b960d GKH |
849 | } |
850 | /* allow device read and ioctl */ | |
851 | dev->present = 1; | |
852 | ||
853 | /* we can register the device now, as it is ready */ | |
854 | usb_set_intfdata(interface, dev); | |
855 | ||
856 | retval = usb_register_dev(interface, &iowarrior_class); | |
857 | if (retval) { | |
858 | /* something prevented us from registering this driver */ | |
859 | dev_err(&interface->dev, "Not able to get a minor for this device.\n"); | |
860 | usb_set_intfdata(interface, NULL); | |
861 | goto error; | |
862 | } | |
863 | ||
864 | dev->minor = interface->minor; | |
865 | ||
866 | /* let the user know what node this device is now attached to */ | |
867 | dev_info(&interface->dev, "IOWarrior product=0x%x, serial=%s interface=%d " | |
868 | "now attached to iowarrior%d\n", dev->product_id, dev->chip_serial, | |
869 | iface_desc->desc.bInterfaceNumber, dev->minor - IOWARRIOR_MINOR_BASE); | |
870 | return retval; | |
871 | ||
872 | error: | |
873 | iowarrior_delete(dev); | |
874 | return retval; | |
875 | } | |
876 | ||
877 | /** | |
878 | * iowarrior_disconnect | |
879 | * | |
880 | * Called by the usb core when the device is removed from the system. | |
881 | */ | |
882 | static void iowarrior_disconnect(struct usb_interface *interface) | |
883 | { | |
884 | struct iowarrior *dev; | |
885 | int minor; | |
886 | ||
946b960d | 887 | dev = usb_get_intfdata(interface); |
03f36e88 | 888 | mutex_lock(&iowarrior_open_disc_lock); |
946b960d GKH |
889 | usb_set_intfdata(interface, NULL); |
890 | ||
946b960d GKH |
891 | minor = dev->minor; |
892 | ||
893 | /* give back our minor */ | |
894 | usb_deregister_dev(interface, &iowarrior_class); | |
895 | ||
d4ead16f AS |
896 | mutex_lock(&dev->mutex); |
897 | ||
946b960d GKH |
898 | /* prevent device read, write and ioctl */ |
899 | dev->present = 0; | |
900 | ||
901 | mutex_unlock(&dev->mutex); | |
03f36e88 | 902 | mutex_unlock(&iowarrior_open_disc_lock); |
946b960d GKH |
903 | |
904 | if (dev->opened) { | |
905 | /* There is a process that holds a filedescriptor to the device , | |
906 | so we only shutdown read-/write-ops going on. | |
907 | Deleting the device is postponed until close() was called. | |
908 | */ | |
909 | usb_kill_urb(dev->int_in_urb); | |
910 | wake_up_interruptible(&dev->read_wait); | |
911 | wake_up_interruptible(&dev->write_wait); | |
912 | } else { | |
913 | /* no process is using the device, cleanup now */ | |
914 | iowarrior_delete(dev); | |
915 | } | |
946b960d GKH |
916 | |
917 | dev_info(&interface->dev, "I/O-Warror #%d now disconnected\n", | |
918 | minor - IOWARRIOR_MINOR_BASE); | |
919 | } | |
920 | ||
921 | /* usb specific object needed to register this driver with the usb subsystem */ | |
922 | static struct usb_driver iowarrior_driver = { | |
923 | .name = "iowarrior", | |
924 | .probe = iowarrior_probe, | |
925 | .disconnect = iowarrior_disconnect, | |
926 | .id_table = iowarrior_ids, | |
927 | }; | |
928 | ||
929 | static int __init iowarrior_init(void) | |
930 | { | |
931 | return usb_register(&iowarrior_driver); | |
932 | } | |
933 | ||
934 | static void __exit iowarrior_exit(void) | |
935 | { | |
936 | usb_deregister(&iowarrior_driver); | |
937 | } | |
938 | ||
939 | module_init(iowarrior_init); | |
940 | module_exit(iowarrior_exit); |