Commit | Line | Data |
---|---|---|
03270634 SH |
1 | /* |
2 | * adutux - driver for ADU devices from Ontrak Control Systems | |
3 | * This is an experimental driver. Use at your own risk. | |
4 | * This driver is not supported by Ontrak Control Systems. | |
5 | * | |
6 | * Copyright (c) 2003 John Homppi (SCO, leave this notice here) | |
7 | * | |
8 | * This program is free software; you can redistribute it and/or | |
9 | * modify it under the terms of the GNU General Public License as | |
10 | * published by the Free Software Foundation; either version 2 of | |
11 | * the License, or (at your option) any later version. | |
12 | * | |
13 | * derived from the Lego USB Tower driver 0.56: | |
14 | * Copyright (c) 2003 David Glance <davidgsf@sourceforge.net> | |
15 | * 2001 Juergen Stuber <stuber@loria.fr> | |
16 | * that was derived from USB Skeleton driver - 0.5 | |
17 | * Copyright (c) 2001 Greg Kroah-Hartman (greg@kroah.com) | |
18 | * | |
19 | */ | |
20 | ||
28f47c34 GKH |
21 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
22 | ||
03270634 SH |
23 | #include <linux/kernel.h> |
24 | #include <linux/errno.h> | |
03270634 SH |
25 | #include <linux/slab.h> |
26 | #include <linux/module.h> | |
27 | #include <linux/usb.h> | |
8293c568 | 28 | #include <linux/mutex.h> |
40cf4833 | 29 | #include <linux/uaccess.h> |
03270634 | 30 | |
03270634 SH |
31 | /* Version Information */ |
32 | #define DRIVER_VERSION "v0.0.13" | |
33 | #define DRIVER_AUTHOR "John Homppi" | |
34 | #define DRIVER_DESC "adutux (see www.ontrak.net)" | |
35 | ||
03270634 SH |
36 | /* Define these values to match your device */ |
37 | #define ADU_VENDOR_ID 0x0a07 | |
38 | #define ADU_PRODUCT_ID 0x0064 | |
39 | ||
40 | /* table of devices that work with this driver */ | |
33b9e162 | 41 | static const struct usb_device_id device_table[] = { |
03270634 | 42 | { USB_DEVICE(ADU_VENDOR_ID, ADU_PRODUCT_ID) }, /* ADU100 */ |
eb79c01a LN |
43 | { USB_DEVICE(ADU_VENDOR_ID, ADU_PRODUCT_ID+20) }, /* ADU120 */ |
44 | { USB_DEVICE(ADU_VENDOR_ID, ADU_PRODUCT_ID+30) }, /* ADU130 */ | |
03270634 SH |
45 | { USB_DEVICE(ADU_VENDOR_ID, ADU_PRODUCT_ID+100) }, /* ADU200 */ |
46 | { USB_DEVICE(ADU_VENDOR_ID, ADU_PRODUCT_ID+108) }, /* ADU208 */ | |
47 | { USB_DEVICE(ADU_VENDOR_ID, ADU_PRODUCT_ID+118) }, /* ADU218 */ | |
83fc1fcd | 48 | { } /* Terminating entry */ |
03270634 SH |
49 | }; |
50 | ||
51 | MODULE_DEVICE_TABLE(usb, device_table); | |
52 | ||
53 | #ifdef CONFIG_USB_DYNAMIC_MINORS | |
54 | #define ADU_MINOR_BASE 0 | |
55 | #else | |
56 | #define ADU_MINOR_BASE 67 | |
57 | #endif | |
58 | ||
59 | /* we can have up to this number of device plugged in at once */ | |
60 | #define MAX_DEVICES 16 | |
61 | ||
62 | #define COMMAND_TIMEOUT (2*HZ) /* 60 second timeout for a command */ | |
63 | ||
f08812d5 PZ |
64 | /* |
65 | * The locking scheme is a vanilla 3-lock: | |
66 | * adu_device.buflock: A spinlock, covers what IRQs touch. | |
67 | * adutux_mutex: A Static lock to cover open_count. It would also cover | |
68 | * any globals, but we don't have them in 2.6. | |
69 | * adu_device.mtx: A mutex to hold across sleepers like copy_from_user. | |
70 | * It covers all of adu_device, except the open_count | |
71 | * and what .buflock covers. | |
72 | */ | |
73 | ||
03270634 SH |
74 | /* Structure to hold all of our device specific stuff */ |
75 | struct adu_device { | |
f08812d5 | 76 | struct mutex mtx; |
30c5c649 LN |
77 | struct usb_device *udev; /* save off the usb device pointer */ |
78 | struct usb_interface *interface; | |
f08812d5 | 79 | unsigned int minor; /* the starting minor number for this device */ |
03270634 SH |
80 | char serial_number[8]; |
81 | ||
82 | int open_count; /* number of times this port has been opened */ | |
83 | ||
30c5c649 | 84 | char *read_buffer_primary; |
03270634 | 85 | int read_buffer_length; |
30c5c649 | 86 | char *read_buffer_secondary; |
03270634 SH |
87 | int secondary_head; |
88 | int secondary_tail; | |
89 | spinlock_t buflock; | |
90 | ||
91 | wait_queue_head_t read_wait; | |
92 | wait_queue_head_t write_wait; | |
93 | ||
30c5c649 LN |
94 | char *interrupt_in_buffer; |
95 | struct usb_endpoint_descriptor *interrupt_in_endpoint; | |
96 | struct urb *interrupt_in_urb; | |
03270634 SH |
97 | int read_urb_finished; |
98 | ||
30c5c649 LN |
99 | char *interrupt_out_buffer; |
100 | struct usb_endpoint_descriptor *interrupt_out_endpoint; | |
101 | struct urb *interrupt_out_urb; | |
f08812d5 | 102 | int out_urb_finished; |
03270634 SH |
103 | }; |
104 | ||
f08812d5 PZ |
105 | static DEFINE_MUTEX(adutux_mutex); |
106 | ||
03270634 SH |
107 | static struct usb_driver adu_driver; |
108 | ||
1ef37c60 GKH |
109 | static inline void adu_debug_data(struct device *dev, const char *function, |
110 | int size, const unsigned char *data) | |
03270634 | 111 | { |
1ef37c60 GKH |
112 | dev_dbg(dev, "%s - length = %d, data = %*ph\n", |
113 | function, size, size, data); | |
03270634 SH |
114 | } |
115 | ||
116 | /** | |
117 | * adu_abort_transfers | |
118 | * aborts transfers and frees associated data structures | |
119 | */ | |
120 | static void adu_abort_transfers(struct adu_device *dev) | |
121 | { | |
f08812d5 | 122 | unsigned long flags; |
03270634 | 123 | |
66d4bc30 | 124 | if (dev->udev == NULL) |
6e42a158 | 125 | return; |
03270634 | 126 | |
03270634 | 127 | /* shutdown transfer */ |
f08812d5 PZ |
128 | |
129 | /* XXX Anchor these instead */ | |
130 | spin_lock_irqsave(&dev->buflock, flags); | |
131 | if (!dev->read_urb_finished) { | |
132 | spin_unlock_irqrestore(&dev->buflock, flags); | |
133 | usb_kill_urb(dev->interrupt_in_urb); | |
134 | } else | |
135 | spin_unlock_irqrestore(&dev->buflock, flags); | |
136 | ||
137 | spin_lock_irqsave(&dev->buflock, flags); | |
138 | if (!dev->out_urb_finished) { | |
139 | spin_unlock_irqrestore(&dev->buflock, flags); | |
140 | usb_kill_urb(dev->interrupt_out_urb); | |
141 | } else | |
142 | spin_unlock_irqrestore(&dev->buflock, flags); | |
03270634 SH |
143 | } |
144 | ||
145 | static void adu_delete(struct adu_device *dev) | |
146 | { | |
03270634 SH |
147 | /* free data structures */ |
148 | usb_free_urb(dev->interrupt_in_urb); | |
149 | usb_free_urb(dev->interrupt_out_urb); | |
150 | kfree(dev->read_buffer_primary); | |
151 | kfree(dev->read_buffer_secondary); | |
152 | kfree(dev->interrupt_in_buffer); | |
153 | kfree(dev->interrupt_out_buffer); | |
154 | kfree(dev); | |
03270634 SH |
155 | } |
156 | ||
7d12e780 | 157 | static void adu_interrupt_in_callback(struct urb *urb) |
03270634 SH |
158 | { |
159 | struct adu_device *dev = urb->context; | |
24497a00 | 160 | int status = urb->status; |
03270634 | 161 | |
1ef37c60 GKH |
162 | adu_debug_data(&dev->udev->dev, __func__, |
163 | urb->actual_length, urb->transfer_buffer); | |
03270634 SH |
164 | |
165 | spin_lock(&dev->buflock); | |
166 | ||
24497a00 | 167 | if (status != 0) { |
f6c1ceaa ON |
168 | if ((status != -ENOENT) && (status != -ECONNRESET) && |
169 | (status != -ESHUTDOWN)) { | |
66d4bc30 GKH |
170 | dev_dbg(&dev->udev->dev, |
171 | "%s : nonzero status received: %d\n", | |
172 | __func__, status); | |
03270634 SH |
173 | } |
174 | goto exit; | |
175 | } | |
176 | ||
177 | if (urb->actual_length > 0 && dev->interrupt_in_buffer[0] != 0x00) { | |
178 | if (dev->read_buffer_length < | |
29cc8897 | 179 | (4 * usb_endpoint_maxp(dev->interrupt_in_endpoint)) - |
03270634 SH |
180 | (urb->actual_length)) { |
181 | memcpy (dev->read_buffer_primary + | |
182 | dev->read_buffer_length, | |
183 | dev->interrupt_in_buffer, urb->actual_length); | |
184 | ||
185 | dev->read_buffer_length += urb->actual_length; | |
66d4bc30 GKH |
186 | dev_dbg(&dev->udev->dev,"%s reading %d\n", __func__, |
187 | urb->actual_length); | |
03270634 | 188 | } else { |
66d4bc30 GKH |
189 | dev_dbg(&dev->udev->dev,"%s : read_buffer overflow\n", |
190 | __func__); | |
03270634 SH |
191 | } |
192 | } | |
193 | ||
194 | exit: | |
195 | dev->read_urb_finished = 1; | |
196 | spin_unlock(&dev->buflock); | |
197 | /* always wake up so we recover from errors */ | |
198 | wake_up_interruptible(&dev->read_wait); | |
03270634 SH |
199 | } |
200 | ||
7d12e780 | 201 | static void adu_interrupt_out_callback(struct urb *urb) |
03270634 SH |
202 | { |
203 | struct adu_device *dev = urb->context; | |
24497a00 | 204 | int status = urb->status; |
03270634 | 205 | |
1ef37c60 GKH |
206 | adu_debug_data(&dev->udev->dev, __func__, |
207 | urb->actual_length, urb->transfer_buffer); | |
03270634 | 208 | |
24497a00 GKH |
209 | if (status != 0) { |
210 | if ((status != -ENOENT) && | |
211 | (status != -ECONNRESET)) { | |
66d4bc30 GKH |
212 | dev_dbg(&dev->udev->dev, |
213 | "%s :nonzero status received: %d\n", __func__, | |
214 | status); | |
03270634 | 215 | } |
1ef37c60 | 216 | return; |
03270634 SH |
217 | } |
218 | ||
f08812d5 PZ |
219 | spin_lock(&dev->buflock); |
220 | dev->out_urb_finished = 1; | |
221 | wake_up(&dev->write_wait); | |
222 | spin_unlock(&dev->buflock); | |
03270634 SH |
223 | } |
224 | ||
225 | static int adu_open(struct inode *inode, struct file *file) | |
226 | { | |
227 | struct adu_device *dev = NULL; | |
228 | struct usb_interface *interface; | |
229 | int subminor; | |
f08812d5 | 230 | int retval; |
03270634 | 231 | |
03270634 SH |
232 | subminor = iminor(inode); |
233 | ||
e77c4e6a | 234 | retval = mutex_lock_interruptible(&adutux_mutex); |
66d4bc30 | 235 | if (retval) |
f08812d5 | 236 | goto exit_no_lock; |
f08812d5 | 237 | |
03270634 SH |
238 | interface = usb_find_interface(&adu_driver, subminor); |
239 | if (!interface) { | |
28f47c34 GKH |
240 | pr_err("%s - error, can't find device for minor %d\n", |
241 | __func__, subminor); | |
03270634 SH |
242 | retval = -ENODEV; |
243 | goto exit_no_device; | |
244 | } | |
245 | ||
246 | dev = usb_get_intfdata(interface); | |
f08812d5 | 247 | if (!dev || !dev->udev) { |
03270634 SH |
248 | retval = -ENODEV; |
249 | goto exit_no_device; | |
250 | } | |
251 | ||
f08812d5 PZ |
252 | /* check that nobody else is using the device */ |
253 | if (dev->open_count) { | |
254 | retval = -EBUSY; | |
03270634 SH |
255 | goto exit_no_device; |
256 | } | |
257 | ||
03270634 | 258 | ++dev->open_count; |
66d4bc30 GKH |
259 | dev_dbg(&dev->udev->dev, "%s: open count %d\n", __func__, |
260 | dev->open_count); | |
03270634 SH |
261 | |
262 | /* save device in the file's private structure */ | |
263 | file->private_data = dev; | |
264 | ||
f08812d5 PZ |
265 | /* initialize in direction */ |
266 | dev->read_buffer_length = 0; | |
03270634 | 267 | |
f08812d5 | 268 | /* fixup first read by having urb waiting for it */ |
05d76399 | 269 | usb_fill_int_urb(dev->interrupt_in_urb, dev->udev, |
f08812d5 PZ |
270 | usb_rcvintpipe(dev->udev, |
271 | dev->interrupt_in_endpoint->bEndpointAddress), | |
272 | dev->interrupt_in_buffer, | |
29cc8897 | 273 | usb_endpoint_maxp(dev->interrupt_in_endpoint), |
f08812d5 PZ |
274 | adu_interrupt_in_callback, dev, |
275 | dev->interrupt_in_endpoint->bInterval); | |
276 | dev->read_urb_finished = 0; | |
277 | if (usb_submit_urb(dev->interrupt_in_urb, GFP_KERNEL)) | |
278 | dev->read_urb_finished = 1; | |
279 | /* we ignore failure */ | |
280 | /* end of fixup for first read */ | |
281 | ||
282 | /* initialize out direction */ | |
283 | dev->out_urb_finished = 1; | |
284 | ||
285 | retval = 0; | |
03270634 SH |
286 | |
287 | exit_no_device: | |
f08812d5 PZ |
288 | mutex_unlock(&adutux_mutex); |
289 | exit_no_lock: | |
03270634 SH |
290 | return retval; |
291 | } | |
292 | ||
f08812d5 | 293 | static void adu_release_internal(struct adu_device *dev) |
03270634 | 294 | { |
03270634 SH |
295 | /* decrement our usage count for the device */ |
296 | --dev->open_count; | |
66d4bc30 GKH |
297 | dev_dbg(&dev->udev->dev, "%s : open count %d\n", __func__, |
298 | dev->open_count); | |
03270634 SH |
299 | if (dev->open_count <= 0) { |
300 | adu_abort_transfers(dev); | |
301 | dev->open_count = 0; | |
302 | } | |
03270634 SH |
303 | } |
304 | ||
305 | static int adu_release(struct inode *inode, struct file *file) | |
306 | { | |
f08812d5 | 307 | struct adu_device *dev; |
03270634 SH |
308 | int retval = 0; |
309 | ||
03270634 | 310 | if (file == NULL) { |
03270634 SH |
311 | retval = -ENODEV; |
312 | goto exit; | |
313 | } | |
314 | ||
315 | dev = file->private_data; | |
03270634 | 316 | if (dev == NULL) { |
03270634 SH |
317 | retval = -ENODEV; |
318 | goto exit; | |
319 | } | |
320 | ||
f08812d5 | 321 | mutex_lock(&adutux_mutex); /* not interruptible */ |
03270634 SH |
322 | |
323 | if (dev->open_count <= 0) { | |
66d4bc30 | 324 | dev_dbg(&dev->udev->dev, "%s : device not opened\n", __func__); |
03270634 | 325 | retval = -ENODEV; |
46c9844c | 326 | goto unlock; |
03270634 SH |
327 | } |
328 | ||
f08812d5 | 329 | adu_release_internal(dev); |
d4ead16f AS |
330 | if (dev->udev == NULL) { |
331 | /* the device was unplugged before the file was released */ | |
f08812d5 PZ |
332 | if (!dev->open_count) /* ... and we're the last user */ |
333 | adu_delete(dev); | |
d4ead16f | 334 | } |
46c9844c | 335 | unlock: |
f08812d5 | 336 | mutex_unlock(&adutux_mutex); |
46c9844c | 337 | exit: |
03270634 SH |
338 | return retval; |
339 | } | |
340 | ||
341 | static ssize_t adu_read(struct file *file, __user char *buffer, size_t count, | |
342 | loff_t *ppos) | |
343 | { | |
344 | struct adu_device *dev; | |
345 | size_t bytes_read = 0; | |
346 | size_t bytes_to_read = count; | |
347 | int i; | |
348 | int retval = 0; | |
349 | int timeout = 0; | |
350 | int should_submit = 0; | |
351 | unsigned long flags; | |
352 | DECLARE_WAITQUEUE(wait, current); | |
353 | ||
03270634 | 354 | dev = file->private_data; |
8293c568 | 355 | if (mutex_lock_interruptible(&dev->mtx)) |
03270634 SH |
356 | return -ERESTARTSYS; |
357 | ||
358 | /* verify that the device wasn't unplugged */ | |
f08812d5 | 359 | if (dev->udev == NULL) { |
03270634 | 360 | retval = -ENODEV; |
28f47c34 | 361 | pr_err("No device or device unplugged %d\n", retval); |
03270634 SH |
362 | goto exit; |
363 | } | |
364 | ||
365 | /* verify that some data was requested */ | |
366 | if (count == 0) { | |
66d4bc30 GKH |
367 | dev_dbg(&dev->udev->dev, "%s : read request of 0 bytes\n", |
368 | __func__); | |
03270634 SH |
369 | goto exit; |
370 | } | |
371 | ||
372 | timeout = COMMAND_TIMEOUT; | |
66d4bc30 | 373 | dev_dbg(&dev->udev->dev, "%s : about to start looping\n", __func__); |
03270634 SH |
374 | while (bytes_to_read) { |
375 | int data_in_secondary = dev->secondary_tail - dev->secondary_head; | |
66d4bc30 GKH |
376 | dev_dbg(&dev->udev->dev, |
377 | "%s : while, data_in_secondary=%d, status=%d\n", | |
378 | __func__, data_in_secondary, | |
379 | dev->interrupt_in_urb->status); | |
03270634 SH |
380 | |
381 | if (data_in_secondary) { | |
382 | /* drain secondary buffer */ | |
383 | int amount = bytes_to_read < data_in_secondary ? bytes_to_read : data_in_secondary; | |
384 | i = copy_to_user(buffer, dev->read_buffer_secondary+dev->secondary_head, amount); | |
1865a9c3 | 385 | if (i) { |
03270634 SH |
386 | retval = -EFAULT; |
387 | goto exit; | |
388 | } | |
389 | dev->secondary_head += (amount - i); | |
390 | bytes_read += (amount - i); | |
391 | bytes_to_read -= (amount - i); | |
392 | if (i) { | |
393 | retval = bytes_read ? bytes_read : -EFAULT; | |
394 | goto exit; | |
395 | } | |
396 | } else { | |
397 | /* we check the primary buffer */ | |
398 | spin_lock_irqsave (&dev->buflock, flags); | |
399 | if (dev->read_buffer_length) { | |
400 | /* we secure access to the primary */ | |
401 | char *tmp; | |
66d4bc30 GKH |
402 | dev_dbg(&dev->udev->dev, |
403 | "%s : swap, read_buffer_length = %d\n", | |
404 | __func__, dev->read_buffer_length); | |
03270634 SH |
405 | tmp = dev->read_buffer_secondary; |
406 | dev->read_buffer_secondary = dev->read_buffer_primary; | |
407 | dev->read_buffer_primary = tmp; | |
408 | dev->secondary_head = 0; | |
409 | dev->secondary_tail = dev->read_buffer_length; | |
410 | dev->read_buffer_length = 0; | |
411 | spin_unlock_irqrestore(&dev->buflock, flags); | |
412 | /* we have a free buffer so use it */ | |
413 | should_submit = 1; | |
414 | } else { | |
415 | /* even the primary was empty - we may need to do IO */ | |
f08812d5 | 416 | if (!dev->read_urb_finished) { |
03270634 SH |
417 | /* somebody is doing IO */ |
418 | spin_unlock_irqrestore(&dev->buflock, flags); | |
66d4bc30 GKH |
419 | dev_dbg(&dev->udev->dev, |
420 | "%s : submitted already\n", | |
421 | __func__); | |
03270634 SH |
422 | } else { |
423 | /* we must initiate input */ | |
66d4bc30 GKH |
424 | dev_dbg(&dev->udev->dev, |
425 | "%s : initiate input\n", | |
426 | __func__); | |
03270634 | 427 | dev->read_urb_finished = 0; |
f08812d5 | 428 | spin_unlock_irqrestore(&dev->buflock, flags); |
03270634 | 429 | |
05d76399 | 430 | usb_fill_int_urb(dev->interrupt_in_urb, dev->udev, |
eb79c01a LN |
431 | usb_rcvintpipe(dev->udev, |
432 | dev->interrupt_in_endpoint->bEndpointAddress), | |
03270634 | 433 | dev->interrupt_in_buffer, |
29cc8897 | 434 | usb_endpoint_maxp(dev->interrupt_in_endpoint), |
03270634 SH |
435 | adu_interrupt_in_callback, |
436 | dev, | |
437 | dev->interrupt_in_endpoint->bInterval); | |
f08812d5 PZ |
438 | retval = usb_submit_urb(dev->interrupt_in_urb, GFP_KERNEL); |
439 | if (retval) { | |
440 | dev->read_urb_finished = 1; | |
03270634 SH |
441 | if (retval == -ENOMEM) { |
442 | retval = bytes_read ? bytes_read : -ENOMEM; | |
443 | } | |
66d4bc30 GKH |
444 | dev_dbg(&dev->udev->dev, |
445 | "%s : submit failed\n", | |
446 | __func__); | |
03270634 SH |
447 | goto exit; |
448 | } | |
449 | } | |
450 | ||
451 | /* we wait for I/O to complete */ | |
452 | set_current_state(TASK_INTERRUPTIBLE); | |
453 | add_wait_queue(&dev->read_wait, &wait); | |
f08812d5 PZ |
454 | spin_lock_irqsave(&dev->buflock, flags); |
455 | if (!dev->read_urb_finished) { | |
456 | spin_unlock_irqrestore(&dev->buflock, flags); | |
03270634 | 457 | timeout = schedule_timeout(COMMAND_TIMEOUT); |
f08812d5 PZ |
458 | } else { |
459 | spin_unlock_irqrestore(&dev->buflock, flags); | |
03270634 | 460 | set_current_state(TASK_RUNNING); |
f08812d5 | 461 | } |
03270634 SH |
462 | remove_wait_queue(&dev->read_wait, &wait); |
463 | ||
464 | if (timeout <= 0) { | |
66d4bc30 GKH |
465 | dev_dbg(&dev->udev->dev, |
466 | "%s : timeout\n", __func__); | |
03270634 SH |
467 | retval = bytes_read ? bytes_read : -ETIMEDOUT; |
468 | goto exit; | |
469 | } | |
470 | ||
471 | if (signal_pending(current)) { | |
66d4bc30 GKH |
472 | dev_dbg(&dev->udev->dev, |
473 | "%s : signal pending\n", | |
474 | __func__); | |
03270634 SH |
475 | retval = bytes_read ? bytes_read : -EINTR; |
476 | goto exit; | |
477 | } | |
478 | } | |
479 | } | |
480 | } | |
481 | ||
482 | retval = bytes_read; | |
483 | /* if the primary buffer is empty then use it */ | |
f08812d5 PZ |
484 | spin_lock_irqsave(&dev->buflock, flags); |
485 | if (should_submit && dev->read_urb_finished) { | |
486 | dev->read_urb_finished = 0; | |
487 | spin_unlock_irqrestore(&dev->buflock, flags); | |
05d76399 | 488 | usb_fill_int_urb(dev->interrupt_in_urb, dev->udev, |
03270634 | 489 | usb_rcvintpipe(dev->udev, |
eb79c01a | 490 | dev->interrupt_in_endpoint->bEndpointAddress), |
f08812d5 | 491 | dev->interrupt_in_buffer, |
29cc8897 | 492 | usb_endpoint_maxp(dev->interrupt_in_endpoint), |
f08812d5 PZ |
493 | adu_interrupt_in_callback, |
494 | dev, | |
495 | dev->interrupt_in_endpoint->bInterval); | |
496 | if (usb_submit_urb(dev->interrupt_in_urb, GFP_KERNEL) != 0) | |
497 | dev->read_urb_finished = 1; | |
03270634 | 498 | /* we ignore failure */ |
f08812d5 PZ |
499 | } else { |
500 | spin_unlock_irqrestore(&dev->buflock, flags); | |
03270634 SH |
501 | } |
502 | ||
503 | exit: | |
504 | /* unlock the device */ | |
8293c568 | 505 | mutex_unlock(&dev->mtx); |
03270634 | 506 | |
03270634 SH |
507 | return retval; |
508 | } | |
509 | ||
510 | static ssize_t adu_write(struct file *file, const __user char *buffer, | |
511 | size_t count, loff_t *ppos) | |
512 | { | |
f08812d5 | 513 | DECLARE_WAITQUEUE(waita, current); |
03270634 SH |
514 | struct adu_device *dev; |
515 | size_t bytes_written = 0; | |
516 | size_t bytes_to_write; | |
517 | size_t buffer_size; | |
f08812d5 | 518 | unsigned long flags; |
ebc3ac14 | 519 | int retval; |
03270634 | 520 | |
03270634 SH |
521 | dev = file->private_data; |
522 | ||
8293c568 | 523 | retval = mutex_lock_interruptible(&dev->mtx); |
ebc3ac14 ON |
524 | if (retval) |
525 | goto exit_nolock; | |
03270634 SH |
526 | |
527 | /* verify that the device wasn't unplugged */ | |
f08812d5 | 528 | if (dev->udev == NULL) { |
03270634 | 529 | retval = -ENODEV; |
28f47c34 | 530 | pr_err("No device or device unplugged %d\n", retval); |
03270634 SH |
531 | goto exit; |
532 | } | |
533 | ||
534 | /* verify that we actually have some data to write */ | |
535 | if (count == 0) { | |
66d4bc30 GKH |
536 | dev_dbg(&dev->udev->dev, "%s : write request of 0 bytes\n", |
537 | __func__); | |
03270634 SH |
538 | goto exit; |
539 | } | |
540 | ||
03270634 | 541 | while (count > 0) { |
f08812d5 PZ |
542 | add_wait_queue(&dev->write_wait, &waita); |
543 | set_current_state(TASK_INTERRUPTIBLE); | |
544 | spin_lock_irqsave(&dev->buflock, flags); | |
545 | if (!dev->out_urb_finished) { | |
546 | spin_unlock_irqrestore(&dev->buflock, flags); | |
03270634 | 547 | |
f08812d5 PZ |
548 | mutex_unlock(&dev->mtx); |
549 | if (signal_pending(current)) { | |
66d4bc30 GKH |
550 | dev_dbg(&dev->udev->dev, "%s : interrupted\n", |
551 | __func__); | |
f08812d5 | 552 | set_current_state(TASK_RUNNING); |
03270634 | 553 | retval = -EINTR; |
f08812d5 | 554 | goto exit_onqueue; |
03270634 | 555 | } |
f08812d5 | 556 | if (schedule_timeout(COMMAND_TIMEOUT) == 0) { |
66d4bc30 GKH |
557 | dev_dbg(&dev->udev->dev, |
558 | "%s - command timed out.\n", __func__); | |
f08812d5 PZ |
559 | retval = -ETIMEDOUT; |
560 | goto exit_onqueue; | |
561 | } | |
562 | remove_wait_queue(&dev->write_wait, &waita); | |
8293c568 | 563 | retval = mutex_lock_interruptible(&dev->mtx); |
ebc3ac14 ON |
564 | if (retval) { |
565 | retval = bytes_written ? bytes_written : retval; | |
566 | goto exit_nolock; | |
567 | } | |
03270634 | 568 | |
66d4bc30 GKH |
569 | dev_dbg(&dev->udev->dev, |
570 | "%s : in progress, count = %Zd\n", | |
571 | __func__, count); | |
03270634 | 572 | } else { |
f08812d5 PZ |
573 | spin_unlock_irqrestore(&dev->buflock, flags); |
574 | set_current_state(TASK_RUNNING); | |
575 | remove_wait_queue(&dev->write_wait, &waita); | |
66d4bc30 GKH |
576 | dev_dbg(&dev->udev->dev, "%s : sending, count = %Zd\n", |
577 | __func__, count); | |
03270634 SH |
578 | |
579 | /* write the data into interrupt_out_buffer from userspace */ | |
29cc8897 | 580 | buffer_size = usb_endpoint_maxp(dev->interrupt_out_endpoint); |
03270634 | 581 | bytes_to_write = count > buffer_size ? buffer_size : count; |
66d4bc30 GKH |
582 | dev_dbg(&dev->udev->dev, |
583 | "%s : buffer_size = %Zd, count = %Zd, bytes_to_write = %Zd\n", | |
584 | __func__, buffer_size, count, bytes_to_write); | |
03270634 SH |
585 | |
586 | if (copy_from_user(dev->interrupt_out_buffer, buffer, bytes_to_write) != 0) { | |
587 | retval = -EFAULT; | |
588 | goto exit; | |
589 | } | |
590 | ||
591 | /* send off the urb */ | |
592 | usb_fill_int_urb( | |
593 | dev->interrupt_out_urb, | |
594 | dev->udev, | |
595 | usb_sndintpipe(dev->udev, dev->interrupt_out_endpoint->bEndpointAddress), | |
596 | dev->interrupt_out_buffer, | |
597 | bytes_to_write, | |
598 | adu_interrupt_out_callback, | |
599 | dev, | |
f08812d5 | 600 | dev->interrupt_out_endpoint->bInterval); |
03270634 | 601 | dev->interrupt_out_urb->actual_length = bytes_to_write; |
f08812d5 | 602 | dev->out_urb_finished = 0; |
03270634 SH |
603 | retval = usb_submit_urb(dev->interrupt_out_urb, GFP_KERNEL); |
604 | if (retval < 0) { | |
f08812d5 | 605 | dev->out_urb_finished = 1; |
fd3f1917 GKH |
606 | dev_err(&dev->udev->dev, "Couldn't submit " |
607 | "interrupt_out_urb %d\n", retval); | |
03270634 SH |
608 | goto exit; |
609 | } | |
610 | ||
611 | buffer += bytes_to_write; | |
612 | count -= bytes_to_write; | |
613 | ||
614 | bytes_written += bytes_to_write; | |
615 | } | |
616 | } | |
f08812d5 PZ |
617 | mutex_unlock(&dev->mtx); |
618 | return bytes_written; | |
03270634 SH |
619 | |
620 | exit: | |
8293c568 | 621 | mutex_unlock(&dev->mtx); |
ebc3ac14 | 622 | exit_nolock: |
f08812d5 | 623 | return retval; |
03270634 | 624 | |
f08812d5 PZ |
625 | exit_onqueue: |
626 | remove_wait_queue(&dev->write_wait, &waita); | |
03270634 SH |
627 | return retval; |
628 | } | |
629 | ||
630 | /* file operations needed when we register this driver */ | |
00977a59 | 631 | static const struct file_operations adu_fops = { |
03270634 SH |
632 | .owner = THIS_MODULE, |
633 | .read = adu_read, | |
634 | .write = adu_write, | |
635 | .open = adu_open, | |
636 | .release = adu_release, | |
6038f373 | 637 | .llseek = noop_llseek, |
03270634 SH |
638 | }; |
639 | ||
640 | /* | |
641 | * usb class driver info in order to get a minor number from the usb core, | |
642 | * and to have the device registered with devfs and the driver core | |
643 | */ | |
644 | static struct usb_class_driver adu_class = { | |
645 | .name = "usb/adutux%d", | |
646 | .fops = &adu_fops, | |
647 | .minor_base = ADU_MINOR_BASE, | |
648 | }; | |
649 | ||
650 | /** | |
651 | * adu_probe | |
652 | * | |
653 | * Called by the usb core when a new device is connected that it thinks | |
654 | * this driver might be interested in. | |
655 | */ | |
656 | static int adu_probe(struct usb_interface *interface, | |
657 | const struct usb_device_id *id) | |
658 | { | |
659 | struct usb_device *udev = interface_to_usbdev(interface); | |
660 | struct adu_device *dev = NULL; | |
661 | struct usb_host_interface *iface_desc; | |
662 | struct usb_endpoint_descriptor *endpoint; | |
663 | int retval = -ENODEV; | |
664 | int in_end_size; | |
665 | int out_end_size; | |
666 | int i; | |
667 | ||
03270634 SH |
668 | if (udev == NULL) { |
669 | dev_err(&interface->dev, "udev is NULL.\n"); | |
670 | goto exit; | |
671 | } | |
672 | ||
b595076a | 673 | /* allocate memory for our device state and initialize it */ |
03270634 SH |
674 | dev = kzalloc(sizeof(struct adu_device), GFP_KERNEL); |
675 | if (dev == NULL) { | |
676 | dev_err(&interface->dev, "Out of memory\n"); | |
677 | retval = -ENOMEM; | |
678 | goto exit; | |
679 | } | |
680 | ||
8293c568 | 681 | mutex_init(&dev->mtx); |
03270634 SH |
682 | spin_lock_init(&dev->buflock); |
683 | dev->udev = udev; | |
684 | init_waitqueue_head(&dev->read_wait); | |
685 | init_waitqueue_head(&dev->write_wait); | |
686 | ||
687 | iface_desc = &interface->altsetting[0]; | |
688 | ||
689 | /* set up the endpoint information */ | |
690 | for (i = 0; i < iface_desc->desc.bNumEndpoints; ++i) { | |
691 | endpoint = &iface_desc->endpoint[i].desc; | |
692 | ||
693 | if (usb_endpoint_is_int_in(endpoint)) | |
694 | dev->interrupt_in_endpoint = endpoint; | |
695 | ||
696 | if (usb_endpoint_is_int_out(endpoint)) | |
697 | dev->interrupt_out_endpoint = endpoint; | |
698 | } | |
699 | if (dev->interrupt_in_endpoint == NULL) { | |
700 | dev_err(&interface->dev, "interrupt in endpoint not found\n"); | |
701 | goto error; | |
702 | } | |
703 | if (dev->interrupt_out_endpoint == NULL) { | |
704 | dev_err(&interface->dev, "interrupt out endpoint not found\n"); | |
705 | goto error; | |
706 | } | |
707 | ||
29cc8897 KM |
708 | in_end_size = usb_endpoint_maxp(dev->interrupt_in_endpoint); |
709 | out_end_size = usb_endpoint_maxp(dev->interrupt_out_endpoint); | |
03270634 SH |
710 | |
711 | dev->read_buffer_primary = kmalloc((4 * in_end_size), GFP_KERNEL); | |
712 | if (!dev->read_buffer_primary) { | |
713 | dev_err(&interface->dev, "Couldn't allocate read_buffer_primary\n"); | |
714 | retval = -ENOMEM; | |
715 | goto error; | |
716 | } | |
717 | ||
718 | /* debug code prime the buffer */ | |
719 | memset(dev->read_buffer_primary, 'a', in_end_size); | |
720 | memset(dev->read_buffer_primary + in_end_size, 'b', in_end_size); | |
721 | memset(dev->read_buffer_primary + (2 * in_end_size), 'c', in_end_size); | |
722 | memset(dev->read_buffer_primary + (3 * in_end_size), 'd', in_end_size); | |
723 | ||
724 | dev->read_buffer_secondary = kmalloc((4 * in_end_size), GFP_KERNEL); | |
725 | if (!dev->read_buffer_secondary) { | |
726 | dev_err(&interface->dev, "Couldn't allocate read_buffer_secondary\n"); | |
727 | retval = -ENOMEM; | |
728 | goto error; | |
729 | } | |
730 | ||
731 | /* debug code prime the buffer */ | |
732 | memset(dev->read_buffer_secondary, 'e', in_end_size); | |
733 | memset(dev->read_buffer_secondary + in_end_size, 'f', in_end_size); | |
734 | memset(dev->read_buffer_secondary + (2 * in_end_size), 'g', in_end_size); | |
735 | memset(dev->read_buffer_secondary + (3 * in_end_size), 'h', in_end_size); | |
736 | ||
737 | dev->interrupt_in_buffer = kmalloc(in_end_size, GFP_KERNEL); | |
738 | if (!dev->interrupt_in_buffer) { | |
739 | dev_err(&interface->dev, "Couldn't allocate interrupt_in_buffer\n"); | |
740 | goto error; | |
741 | } | |
742 | ||
743 | /* debug code prime the buffer */ | |
744 | memset(dev->interrupt_in_buffer, 'i', in_end_size); | |
745 | ||
746 | dev->interrupt_in_urb = usb_alloc_urb(0, GFP_KERNEL); | |
747 | if (!dev->interrupt_in_urb) { | |
748 | dev_err(&interface->dev, "Couldn't allocate interrupt_in_urb\n"); | |
749 | goto error; | |
750 | } | |
751 | dev->interrupt_out_buffer = kmalloc(out_end_size, GFP_KERNEL); | |
752 | if (!dev->interrupt_out_buffer) { | |
753 | dev_err(&interface->dev, "Couldn't allocate interrupt_out_buffer\n"); | |
754 | goto error; | |
755 | } | |
756 | dev->interrupt_out_urb = usb_alloc_urb(0, GFP_KERNEL); | |
757 | if (!dev->interrupt_out_urb) { | |
758 | dev_err(&interface->dev, "Couldn't allocate interrupt_out_urb\n"); | |
759 | goto error; | |
760 | } | |
761 | ||
762 | if (!usb_string(udev, udev->descriptor.iSerialNumber, dev->serial_number, | |
763 | sizeof(dev->serial_number))) { | |
764 | dev_err(&interface->dev, "Could not retrieve serial number\n"); | |
765 | goto error; | |
766 | } | |
66d4bc30 | 767 | dev_dbg(&interface->dev,"serial_number=%s", dev->serial_number); |
03270634 SH |
768 | |
769 | /* we can register the device now, as it is ready */ | |
770 | usb_set_intfdata(interface, dev); | |
771 | ||
772 | retval = usb_register_dev(interface, &adu_class); | |
773 | ||
774 | if (retval) { | |
775 | /* something prevented us from registering this driver */ | |
776 | dev_err(&interface->dev, "Not able to get a minor for this device.\n"); | |
777 | usb_set_intfdata(interface, NULL); | |
778 | goto error; | |
779 | } | |
780 | ||
781 | dev->minor = interface->minor; | |
782 | ||
783 | /* let the user know what node this device is now attached to */ | |
898eb71c | 784 | dev_info(&interface->dev, "ADU%d %s now attached to /dev/usb/adutux%d\n", |
d482b9d5 | 785 | le16_to_cpu(udev->descriptor.idProduct), dev->serial_number, |
03270634 SH |
786 | (dev->minor - ADU_MINOR_BASE)); |
787 | exit: | |
03270634 SH |
788 | return retval; |
789 | ||
790 | error: | |
791 | adu_delete(dev); | |
792 | return retval; | |
793 | } | |
794 | ||
795 | /** | |
796 | * adu_disconnect | |
797 | * | |
798 | * Called by the usb core when the device is removed from the system. | |
799 | */ | |
800 | static void adu_disconnect(struct usb_interface *interface) | |
801 | { | |
802 | struct adu_device *dev; | |
803 | int minor; | |
804 | ||
03270634 | 805 | dev = usb_get_intfdata(interface); |
03270634 | 806 | |
f08812d5 PZ |
807 | mutex_lock(&dev->mtx); /* not interruptible */ |
808 | dev->udev = NULL; /* poison */ | |
03270634 | 809 | minor = dev->minor; |
03270634 | 810 | usb_deregister_dev(interface, &adu_class); |
f08812d5 | 811 | mutex_unlock(&dev->mtx); |
03270634 | 812 | |
f08812d5 PZ |
813 | mutex_lock(&adutux_mutex); |
814 | usb_set_intfdata(interface, NULL); | |
d4ead16f | 815 | |
03270634 | 816 | /* if the device is not opened, then we clean up right now */ |
f08812d5 | 817 | if (!dev->open_count) |
03270634 | 818 | adu_delete(dev); |
f08812d5 PZ |
819 | |
820 | mutex_unlock(&adutux_mutex); | |
03270634 SH |
821 | } |
822 | ||
823 | /* usb specific object needed to register this driver with the usb subsystem */ | |
824 | static struct usb_driver adu_driver = { | |
825 | .name = "adutux", | |
826 | .probe = adu_probe, | |
827 | .disconnect = adu_disconnect, | |
828 | .id_table = device_table, | |
829 | }; | |
830 | ||
65db4305 | 831 | module_usb_driver(adu_driver); |
03270634 SH |
832 | |
833 | MODULE_AUTHOR(DRIVER_AUTHOR); | |
834 | MODULE_DESCRIPTION(DRIVER_DESC); | |
835 | MODULE_LICENSE("GPL"); |