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> | |
25 | #include <linux/init.h> | |
26 | #include <linux/slab.h> | |
27 | #include <linux/module.h> | |
28 | #include <linux/usb.h> | |
8293c568 | 29 | #include <linux/mutex.h> |
40cf4833 | 30 | #include <linux/uaccess.h> |
03270634 | 31 | |
03270634 SH |
32 | /* Version Information */ |
33 | #define DRIVER_VERSION "v0.0.13" | |
34 | #define DRIVER_AUTHOR "John Homppi" | |
35 | #define DRIVER_DESC "adutux (see www.ontrak.net)" | |
36 | ||
03270634 SH |
37 | /* Define these values to match your device */ |
38 | #define ADU_VENDOR_ID 0x0a07 | |
39 | #define ADU_PRODUCT_ID 0x0064 | |
40 | ||
41 | /* table of devices that work with this driver */ | |
33b9e162 | 42 | static const struct usb_device_id device_table[] = { |
03270634 | 43 | { USB_DEVICE(ADU_VENDOR_ID, ADU_PRODUCT_ID) }, /* ADU100 */ |
eb79c01a LN |
44 | { USB_DEVICE(ADU_VENDOR_ID, ADU_PRODUCT_ID+20) }, /* ADU120 */ |
45 | { USB_DEVICE(ADU_VENDOR_ID, ADU_PRODUCT_ID+30) }, /* ADU130 */ | |
03270634 SH |
46 | { USB_DEVICE(ADU_VENDOR_ID, ADU_PRODUCT_ID+100) }, /* ADU200 */ |
47 | { USB_DEVICE(ADU_VENDOR_ID, ADU_PRODUCT_ID+108) }, /* ADU208 */ | |
48 | { USB_DEVICE(ADU_VENDOR_ID, ADU_PRODUCT_ID+118) }, /* ADU218 */ | |
83fc1fcd | 49 | { } /* Terminating entry */ |
03270634 SH |
50 | }; |
51 | ||
52 | MODULE_DEVICE_TABLE(usb, device_table); | |
53 | ||
54 | #ifdef CONFIG_USB_DYNAMIC_MINORS | |
55 | #define ADU_MINOR_BASE 0 | |
56 | #else | |
57 | #define ADU_MINOR_BASE 67 | |
58 | #endif | |
59 | ||
60 | /* we can have up to this number of device plugged in at once */ | |
61 | #define MAX_DEVICES 16 | |
62 | ||
63 | #define COMMAND_TIMEOUT (2*HZ) /* 60 second timeout for a command */ | |
64 | ||
f08812d5 PZ |
65 | /* |
66 | * The locking scheme is a vanilla 3-lock: | |
67 | * adu_device.buflock: A spinlock, covers what IRQs touch. | |
68 | * adutux_mutex: A Static lock to cover open_count. It would also cover | |
69 | * any globals, but we don't have them in 2.6. | |
70 | * adu_device.mtx: A mutex to hold across sleepers like copy_from_user. | |
71 | * It covers all of adu_device, except the open_count | |
72 | * and what .buflock covers. | |
73 | */ | |
74 | ||
03270634 SH |
75 | /* Structure to hold all of our device specific stuff */ |
76 | struct adu_device { | |
f08812d5 | 77 | struct mutex mtx; |
30c5c649 LN |
78 | struct usb_device *udev; /* save off the usb device pointer */ |
79 | struct usb_interface *interface; | |
f08812d5 | 80 | unsigned int minor; /* the starting minor number for this device */ |
03270634 SH |
81 | char serial_number[8]; |
82 | ||
83 | int open_count; /* number of times this port has been opened */ | |
84 | ||
30c5c649 | 85 | char *read_buffer_primary; |
03270634 | 86 | int read_buffer_length; |
30c5c649 | 87 | char *read_buffer_secondary; |
03270634 SH |
88 | int secondary_head; |
89 | int secondary_tail; | |
90 | spinlock_t buflock; | |
91 | ||
92 | wait_queue_head_t read_wait; | |
93 | wait_queue_head_t write_wait; | |
94 | ||
30c5c649 LN |
95 | char *interrupt_in_buffer; |
96 | struct usb_endpoint_descriptor *interrupt_in_endpoint; | |
97 | struct urb *interrupt_in_urb; | |
03270634 SH |
98 | int read_urb_finished; |
99 | ||
30c5c649 LN |
100 | char *interrupt_out_buffer; |
101 | struct usb_endpoint_descriptor *interrupt_out_endpoint; | |
102 | struct urb *interrupt_out_urb; | |
f08812d5 | 103 | int out_urb_finished; |
03270634 SH |
104 | }; |
105 | ||
f08812d5 PZ |
106 | static DEFINE_MUTEX(adutux_mutex); |
107 | ||
03270634 SH |
108 | static struct usb_driver adu_driver; |
109 | ||
1ef37c60 GKH |
110 | static inline void adu_debug_data(struct device *dev, const char *function, |
111 | int size, const unsigned char *data) | |
03270634 | 112 | { |
1ef37c60 GKH |
113 | dev_dbg(dev, "%s - length = %d, data = %*ph\n", |
114 | function, size, size, data); | |
03270634 SH |
115 | } |
116 | ||
117 | /** | |
118 | * adu_abort_transfers | |
119 | * aborts transfers and frees associated data structures | |
120 | */ | |
121 | static void adu_abort_transfers(struct adu_device *dev) | |
122 | { | |
f08812d5 | 123 | unsigned long flags; |
03270634 | 124 | |
66d4bc30 | 125 | if (dev->udev == NULL) |
6e42a158 | 126 | return; |
03270634 | 127 | |
03270634 | 128 | /* shutdown transfer */ |
f08812d5 PZ |
129 | |
130 | /* XXX Anchor these instead */ | |
131 | spin_lock_irqsave(&dev->buflock, flags); | |
132 | if (!dev->read_urb_finished) { | |
133 | spin_unlock_irqrestore(&dev->buflock, flags); | |
134 | usb_kill_urb(dev->interrupt_in_urb); | |
135 | } else | |
136 | spin_unlock_irqrestore(&dev->buflock, flags); | |
137 | ||
138 | spin_lock_irqsave(&dev->buflock, flags); | |
139 | if (!dev->out_urb_finished) { | |
140 | spin_unlock_irqrestore(&dev->buflock, flags); | |
141 | usb_kill_urb(dev->interrupt_out_urb); | |
142 | } else | |
143 | spin_unlock_irqrestore(&dev->buflock, flags); | |
03270634 SH |
144 | } |
145 | ||
146 | static void adu_delete(struct adu_device *dev) | |
147 | { | |
03270634 SH |
148 | /* free data structures */ |
149 | usb_free_urb(dev->interrupt_in_urb); | |
150 | usb_free_urb(dev->interrupt_out_urb); | |
151 | kfree(dev->read_buffer_primary); | |
152 | kfree(dev->read_buffer_secondary); | |
153 | kfree(dev->interrupt_in_buffer); | |
154 | kfree(dev->interrupt_out_buffer); | |
155 | kfree(dev); | |
03270634 SH |
156 | } |
157 | ||
7d12e780 | 158 | static void adu_interrupt_in_callback(struct urb *urb) |
03270634 SH |
159 | { |
160 | struct adu_device *dev = urb->context; | |
24497a00 | 161 | int status = urb->status; |
03270634 | 162 | |
1ef37c60 GKH |
163 | adu_debug_data(&dev->udev->dev, __func__, |
164 | urb->actual_length, urb->transfer_buffer); | |
03270634 SH |
165 | |
166 | spin_lock(&dev->buflock); | |
167 | ||
24497a00 | 168 | if (status != 0) { |
f6c1ceaa ON |
169 | if ((status != -ENOENT) && (status != -ECONNRESET) && |
170 | (status != -ESHUTDOWN)) { | |
66d4bc30 GKH |
171 | dev_dbg(&dev->udev->dev, |
172 | "%s : nonzero status received: %d\n", | |
173 | __func__, status); | |
03270634 SH |
174 | } |
175 | goto exit; | |
176 | } | |
177 | ||
178 | if (urb->actual_length > 0 && dev->interrupt_in_buffer[0] != 0x00) { | |
179 | if (dev->read_buffer_length < | |
29cc8897 | 180 | (4 * usb_endpoint_maxp(dev->interrupt_in_endpoint)) - |
03270634 SH |
181 | (urb->actual_length)) { |
182 | memcpy (dev->read_buffer_primary + | |
183 | dev->read_buffer_length, | |
184 | dev->interrupt_in_buffer, urb->actual_length); | |
185 | ||
186 | dev->read_buffer_length += urb->actual_length; | |
66d4bc30 GKH |
187 | dev_dbg(&dev->udev->dev,"%s reading %d\n", __func__, |
188 | urb->actual_length); | |
03270634 | 189 | } else { |
66d4bc30 GKH |
190 | dev_dbg(&dev->udev->dev,"%s : read_buffer overflow\n", |
191 | __func__); | |
03270634 SH |
192 | } |
193 | } | |
194 | ||
195 | exit: | |
196 | dev->read_urb_finished = 1; | |
197 | spin_unlock(&dev->buflock); | |
198 | /* always wake up so we recover from errors */ | |
199 | wake_up_interruptible(&dev->read_wait); | |
03270634 SH |
200 | } |
201 | ||
7d12e780 | 202 | static void adu_interrupt_out_callback(struct urb *urb) |
03270634 SH |
203 | { |
204 | struct adu_device *dev = urb->context; | |
24497a00 | 205 | int status = urb->status; |
03270634 | 206 | |
1ef37c60 GKH |
207 | adu_debug_data(&dev->udev->dev, __func__, |
208 | urb->actual_length, urb->transfer_buffer); | |
03270634 | 209 | |
24497a00 GKH |
210 | if (status != 0) { |
211 | if ((status != -ENOENT) && | |
212 | (status != -ECONNRESET)) { | |
66d4bc30 GKH |
213 | dev_dbg(&dev->udev->dev, |
214 | "%s :nonzero status received: %d\n", __func__, | |
215 | status); | |
03270634 | 216 | } |
1ef37c60 | 217 | return; |
03270634 SH |
218 | } |
219 | ||
f08812d5 PZ |
220 | spin_lock(&dev->buflock); |
221 | dev->out_urb_finished = 1; | |
222 | wake_up(&dev->write_wait); | |
223 | spin_unlock(&dev->buflock); | |
03270634 SH |
224 | } |
225 | ||
226 | static int adu_open(struct inode *inode, struct file *file) | |
227 | { | |
228 | struct adu_device *dev = NULL; | |
229 | struct usb_interface *interface; | |
230 | int subminor; | |
f08812d5 | 231 | int retval; |
03270634 | 232 | |
03270634 SH |
233 | subminor = iminor(inode); |
234 | ||
e77c4e6a | 235 | retval = mutex_lock_interruptible(&adutux_mutex); |
66d4bc30 | 236 | if (retval) |
f08812d5 | 237 | goto exit_no_lock; |
f08812d5 | 238 | |
03270634 SH |
239 | interface = usb_find_interface(&adu_driver, subminor); |
240 | if (!interface) { | |
28f47c34 GKH |
241 | pr_err("%s - error, can't find device for minor %d\n", |
242 | __func__, subminor); | |
03270634 SH |
243 | retval = -ENODEV; |
244 | goto exit_no_device; | |
245 | } | |
246 | ||
247 | dev = usb_get_intfdata(interface); | |
f08812d5 | 248 | if (!dev || !dev->udev) { |
03270634 SH |
249 | retval = -ENODEV; |
250 | goto exit_no_device; | |
251 | } | |
252 | ||
f08812d5 PZ |
253 | /* check that nobody else is using the device */ |
254 | if (dev->open_count) { | |
255 | retval = -EBUSY; | |
03270634 SH |
256 | goto exit_no_device; |
257 | } | |
258 | ||
03270634 | 259 | ++dev->open_count; |
66d4bc30 GKH |
260 | dev_dbg(&dev->udev->dev, "%s: open count %d\n", __func__, |
261 | dev->open_count); | |
03270634 SH |
262 | |
263 | /* save device in the file's private structure */ | |
264 | file->private_data = dev; | |
265 | ||
f08812d5 PZ |
266 | /* initialize in direction */ |
267 | dev->read_buffer_length = 0; | |
03270634 | 268 | |
f08812d5 | 269 | /* fixup first read by having urb waiting for it */ |
05d76399 | 270 | usb_fill_int_urb(dev->interrupt_in_urb, dev->udev, |
f08812d5 PZ |
271 | usb_rcvintpipe(dev->udev, |
272 | dev->interrupt_in_endpoint->bEndpointAddress), | |
273 | dev->interrupt_in_buffer, | |
29cc8897 | 274 | usb_endpoint_maxp(dev->interrupt_in_endpoint), |
f08812d5 PZ |
275 | adu_interrupt_in_callback, dev, |
276 | dev->interrupt_in_endpoint->bInterval); | |
277 | dev->read_urb_finished = 0; | |
278 | if (usb_submit_urb(dev->interrupt_in_urb, GFP_KERNEL)) | |
279 | dev->read_urb_finished = 1; | |
280 | /* we ignore failure */ | |
281 | /* end of fixup for first read */ | |
282 | ||
283 | /* initialize out direction */ | |
284 | dev->out_urb_finished = 1; | |
285 | ||
286 | retval = 0; | |
03270634 SH |
287 | |
288 | exit_no_device: | |
f08812d5 PZ |
289 | mutex_unlock(&adutux_mutex); |
290 | exit_no_lock: | |
03270634 SH |
291 | return retval; |
292 | } | |
293 | ||
f08812d5 | 294 | static void adu_release_internal(struct adu_device *dev) |
03270634 | 295 | { |
03270634 SH |
296 | /* decrement our usage count for the device */ |
297 | --dev->open_count; | |
66d4bc30 GKH |
298 | dev_dbg(&dev->udev->dev, "%s : open count %d\n", __func__, |
299 | dev->open_count); | |
03270634 SH |
300 | if (dev->open_count <= 0) { |
301 | adu_abort_transfers(dev); | |
302 | dev->open_count = 0; | |
303 | } | |
03270634 SH |
304 | } |
305 | ||
306 | static int adu_release(struct inode *inode, struct file *file) | |
307 | { | |
f08812d5 | 308 | struct adu_device *dev; |
03270634 SH |
309 | int retval = 0; |
310 | ||
03270634 | 311 | if (file == NULL) { |
03270634 SH |
312 | retval = -ENODEV; |
313 | goto exit; | |
314 | } | |
315 | ||
316 | dev = file->private_data; | |
03270634 | 317 | if (dev == NULL) { |
03270634 SH |
318 | retval = -ENODEV; |
319 | goto exit; | |
320 | } | |
321 | ||
f08812d5 | 322 | mutex_lock(&adutux_mutex); /* not interruptible */ |
03270634 SH |
323 | |
324 | if (dev->open_count <= 0) { | |
66d4bc30 | 325 | dev_dbg(&dev->udev->dev, "%s : device not opened\n", __func__); |
03270634 | 326 | retval = -ENODEV; |
46c9844c | 327 | goto unlock; |
03270634 SH |
328 | } |
329 | ||
f08812d5 | 330 | adu_release_internal(dev); |
d4ead16f AS |
331 | if (dev->udev == NULL) { |
332 | /* the device was unplugged before the file was released */ | |
f08812d5 PZ |
333 | if (!dev->open_count) /* ... and we're the last user */ |
334 | adu_delete(dev); | |
d4ead16f | 335 | } |
46c9844c | 336 | unlock: |
f08812d5 | 337 | mutex_unlock(&adutux_mutex); |
46c9844c | 338 | exit: |
03270634 SH |
339 | return retval; |
340 | } | |
341 | ||
342 | static ssize_t adu_read(struct file *file, __user char *buffer, size_t count, | |
343 | loff_t *ppos) | |
344 | { | |
345 | struct adu_device *dev; | |
346 | size_t bytes_read = 0; | |
347 | size_t bytes_to_read = count; | |
348 | int i; | |
349 | int retval = 0; | |
350 | int timeout = 0; | |
351 | int should_submit = 0; | |
352 | unsigned long flags; | |
353 | DECLARE_WAITQUEUE(wait, current); | |
354 | ||
03270634 | 355 | dev = file->private_data; |
8293c568 | 356 | if (mutex_lock_interruptible(&dev->mtx)) |
03270634 SH |
357 | return -ERESTARTSYS; |
358 | ||
359 | /* verify that the device wasn't unplugged */ | |
f08812d5 | 360 | if (dev->udev == NULL) { |
03270634 | 361 | retval = -ENODEV; |
28f47c34 | 362 | pr_err("No device or device unplugged %d\n", retval); |
03270634 SH |
363 | goto exit; |
364 | } | |
365 | ||
366 | /* verify that some data was requested */ | |
367 | if (count == 0) { | |
66d4bc30 GKH |
368 | dev_dbg(&dev->udev->dev, "%s : read request of 0 bytes\n", |
369 | __func__); | |
03270634 SH |
370 | goto exit; |
371 | } | |
372 | ||
373 | timeout = COMMAND_TIMEOUT; | |
66d4bc30 | 374 | dev_dbg(&dev->udev->dev, "%s : about to start looping\n", __func__); |
03270634 SH |
375 | while (bytes_to_read) { |
376 | int data_in_secondary = dev->secondary_tail - dev->secondary_head; | |
66d4bc30 GKH |
377 | dev_dbg(&dev->udev->dev, |
378 | "%s : while, data_in_secondary=%d, status=%d\n", | |
379 | __func__, data_in_secondary, | |
380 | dev->interrupt_in_urb->status); | |
03270634 SH |
381 | |
382 | if (data_in_secondary) { | |
383 | /* drain secondary buffer */ | |
384 | int amount = bytes_to_read < data_in_secondary ? bytes_to_read : data_in_secondary; | |
385 | i = copy_to_user(buffer, dev->read_buffer_secondary+dev->secondary_head, amount); | |
1865a9c3 | 386 | if (i) { |
03270634 SH |
387 | retval = -EFAULT; |
388 | goto exit; | |
389 | } | |
390 | dev->secondary_head += (amount - i); | |
391 | bytes_read += (amount - i); | |
392 | bytes_to_read -= (amount - i); | |
393 | if (i) { | |
394 | retval = bytes_read ? bytes_read : -EFAULT; | |
395 | goto exit; | |
396 | } | |
397 | } else { | |
398 | /* we check the primary buffer */ | |
399 | spin_lock_irqsave (&dev->buflock, flags); | |
400 | if (dev->read_buffer_length) { | |
401 | /* we secure access to the primary */ | |
402 | char *tmp; | |
66d4bc30 GKH |
403 | dev_dbg(&dev->udev->dev, |
404 | "%s : swap, read_buffer_length = %d\n", | |
405 | __func__, dev->read_buffer_length); | |
03270634 SH |
406 | tmp = dev->read_buffer_secondary; |
407 | dev->read_buffer_secondary = dev->read_buffer_primary; | |
408 | dev->read_buffer_primary = tmp; | |
409 | dev->secondary_head = 0; | |
410 | dev->secondary_tail = dev->read_buffer_length; | |
411 | dev->read_buffer_length = 0; | |
412 | spin_unlock_irqrestore(&dev->buflock, flags); | |
413 | /* we have a free buffer so use it */ | |
414 | should_submit = 1; | |
415 | } else { | |
416 | /* even the primary was empty - we may need to do IO */ | |
f08812d5 | 417 | if (!dev->read_urb_finished) { |
03270634 SH |
418 | /* somebody is doing IO */ |
419 | spin_unlock_irqrestore(&dev->buflock, flags); | |
66d4bc30 GKH |
420 | dev_dbg(&dev->udev->dev, |
421 | "%s : submitted already\n", | |
422 | __func__); | |
03270634 SH |
423 | } else { |
424 | /* we must initiate input */ | |
66d4bc30 GKH |
425 | dev_dbg(&dev->udev->dev, |
426 | "%s : initiate input\n", | |
427 | __func__); | |
03270634 | 428 | dev->read_urb_finished = 0; |
f08812d5 | 429 | spin_unlock_irqrestore(&dev->buflock, flags); |
03270634 | 430 | |
05d76399 | 431 | usb_fill_int_urb(dev->interrupt_in_urb, dev->udev, |
eb79c01a LN |
432 | usb_rcvintpipe(dev->udev, |
433 | dev->interrupt_in_endpoint->bEndpointAddress), | |
03270634 | 434 | dev->interrupt_in_buffer, |
29cc8897 | 435 | usb_endpoint_maxp(dev->interrupt_in_endpoint), |
03270634 SH |
436 | adu_interrupt_in_callback, |
437 | dev, | |
438 | dev->interrupt_in_endpoint->bInterval); | |
f08812d5 PZ |
439 | retval = usb_submit_urb(dev->interrupt_in_urb, GFP_KERNEL); |
440 | if (retval) { | |
441 | dev->read_urb_finished = 1; | |
03270634 SH |
442 | if (retval == -ENOMEM) { |
443 | retval = bytes_read ? bytes_read : -ENOMEM; | |
444 | } | |
66d4bc30 GKH |
445 | dev_dbg(&dev->udev->dev, |
446 | "%s : submit failed\n", | |
447 | __func__); | |
03270634 SH |
448 | goto exit; |
449 | } | |
450 | } | |
451 | ||
452 | /* we wait for I/O to complete */ | |
453 | set_current_state(TASK_INTERRUPTIBLE); | |
454 | add_wait_queue(&dev->read_wait, &wait); | |
f08812d5 PZ |
455 | spin_lock_irqsave(&dev->buflock, flags); |
456 | if (!dev->read_urb_finished) { | |
457 | spin_unlock_irqrestore(&dev->buflock, flags); | |
03270634 | 458 | timeout = schedule_timeout(COMMAND_TIMEOUT); |
f08812d5 PZ |
459 | } else { |
460 | spin_unlock_irqrestore(&dev->buflock, flags); | |
03270634 | 461 | set_current_state(TASK_RUNNING); |
f08812d5 | 462 | } |
03270634 SH |
463 | remove_wait_queue(&dev->read_wait, &wait); |
464 | ||
465 | if (timeout <= 0) { | |
66d4bc30 GKH |
466 | dev_dbg(&dev->udev->dev, |
467 | "%s : timeout\n", __func__); | |
03270634 SH |
468 | retval = bytes_read ? bytes_read : -ETIMEDOUT; |
469 | goto exit; | |
470 | } | |
471 | ||
472 | if (signal_pending(current)) { | |
66d4bc30 GKH |
473 | dev_dbg(&dev->udev->dev, |
474 | "%s : signal pending\n", | |
475 | __func__); | |
03270634 SH |
476 | retval = bytes_read ? bytes_read : -EINTR; |
477 | goto exit; | |
478 | } | |
479 | } | |
480 | } | |
481 | } | |
482 | ||
483 | retval = bytes_read; | |
484 | /* if the primary buffer is empty then use it */ | |
f08812d5 PZ |
485 | spin_lock_irqsave(&dev->buflock, flags); |
486 | if (should_submit && dev->read_urb_finished) { | |
487 | dev->read_urb_finished = 0; | |
488 | spin_unlock_irqrestore(&dev->buflock, flags); | |
05d76399 | 489 | usb_fill_int_urb(dev->interrupt_in_urb, dev->udev, |
03270634 | 490 | usb_rcvintpipe(dev->udev, |
eb79c01a | 491 | dev->interrupt_in_endpoint->bEndpointAddress), |
f08812d5 | 492 | dev->interrupt_in_buffer, |
29cc8897 | 493 | usb_endpoint_maxp(dev->interrupt_in_endpoint), |
f08812d5 PZ |
494 | adu_interrupt_in_callback, |
495 | dev, | |
496 | dev->interrupt_in_endpoint->bInterval); | |
497 | if (usb_submit_urb(dev->interrupt_in_urb, GFP_KERNEL) != 0) | |
498 | dev->read_urb_finished = 1; | |
03270634 | 499 | /* we ignore failure */ |
f08812d5 PZ |
500 | } else { |
501 | spin_unlock_irqrestore(&dev->buflock, flags); | |
03270634 SH |
502 | } |
503 | ||
504 | exit: | |
505 | /* unlock the device */ | |
8293c568 | 506 | mutex_unlock(&dev->mtx); |
03270634 | 507 | |
03270634 SH |
508 | return retval; |
509 | } | |
510 | ||
511 | static ssize_t adu_write(struct file *file, const __user char *buffer, | |
512 | size_t count, loff_t *ppos) | |
513 | { | |
f08812d5 | 514 | DECLARE_WAITQUEUE(waita, current); |
03270634 SH |
515 | struct adu_device *dev; |
516 | size_t bytes_written = 0; | |
517 | size_t bytes_to_write; | |
518 | size_t buffer_size; | |
f08812d5 | 519 | unsigned long flags; |
ebc3ac14 | 520 | int retval; |
03270634 | 521 | |
03270634 SH |
522 | dev = file->private_data; |
523 | ||
8293c568 | 524 | retval = mutex_lock_interruptible(&dev->mtx); |
ebc3ac14 ON |
525 | if (retval) |
526 | goto exit_nolock; | |
03270634 SH |
527 | |
528 | /* verify that the device wasn't unplugged */ | |
f08812d5 | 529 | if (dev->udev == NULL) { |
03270634 | 530 | retval = -ENODEV; |
28f47c34 | 531 | pr_err("No device or device unplugged %d\n", retval); |
03270634 SH |
532 | goto exit; |
533 | } | |
534 | ||
535 | /* verify that we actually have some data to write */ | |
536 | if (count == 0) { | |
66d4bc30 GKH |
537 | dev_dbg(&dev->udev->dev, "%s : write request of 0 bytes\n", |
538 | __func__); | |
03270634 SH |
539 | goto exit; |
540 | } | |
541 | ||
03270634 | 542 | while (count > 0) { |
f08812d5 PZ |
543 | add_wait_queue(&dev->write_wait, &waita); |
544 | set_current_state(TASK_INTERRUPTIBLE); | |
545 | spin_lock_irqsave(&dev->buflock, flags); | |
546 | if (!dev->out_urb_finished) { | |
547 | spin_unlock_irqrestore(&dev->buflock, flags); | |
03270634 | 548 | |
f08812d5 PZ |
549 | mutex_unlock(&dev->mtx); |
550 | if (signal_pending(current)) { | |
66d4bc30 GKH |
551 | dev_dbg(&dev->udev->dev, "%s : interrupted\n", |
552 | __func__); | |
f08812d5 | 553 | set_current_state(TASK_RUNNING); |
03270634 | 554 | retval = -EINTR; |
f08812d5 | 555 | goto exit_onqueue; |
03270634 | 556 | } |
f08812d5 | 557 | if (schedule_timeout(COMMAND_TIMEOUT) == 0) { |
66d4bc30 GKH |
558 | dev_dbg(&dev->udev->dev, |
559 | "%s - command timed out.\n", __func__); | |
f08812d5 PZ |
560 | retval = -ETIMEDOUT; |
561 | goto exit_onqueue; | |
562 | } | |
563 | remove_wait_queue(&dev->write_wait, &waita); | |
8293c568 | 564 | retval = mutex_lock_interruptible(&dev->mtx); |
ebc3ac14 ON |
565 | if (retval) { |
566 | retval = bytes_written ? bytes_written : retval; | |
567 | goto exit_nolock; | |
568 | } | |
03270634 | 569 | |
66d4bc30 GKH |
570 | dev_dbg(&dev->udev->dev, |
571 | "%s : in progress, count = %Zd\n", | |
572 | __func__, count); | |
03270634 | 573 | } else { |
f08812d5 PZ |
574 | spin_unlock_irqrestore(&dev->buflock, flags); |
575 | set_current_state(TASK_RUNNING); | |
576 | remove_wait_queue(&dev->write_wait, &waita); | |
66d4bc30 GKH |
577 | dev_dbg(&dev->udev->dev, "%s : sending, count = %Zd\n", |
578 | __func__, count); | |
03270634 SH |
579 | |
580 | /* write the data into interrupt_out_buffer from userspace */ | |
29cc8897 | 581 | buffer_size = usb_endpoint_maxp(dev->interrupt_out_endpoint); |
03270634 | 582 | bytes_to_write = count > buffer_size ? buffer_size : count; |
66d4bc30 GKH |
583 | dev_dbg(&dev->udev->dev, |
584 | "%s : buffer_size = %Zd, count = %Zd, bytes_to_write = %Zd\n", | |
585 | __func__, buffer_size, count, bytes_to_write); | |
03270634 SH |
586 | |
587 | if (copy_from_user(dev->interrupt_out_buffer, buffer, bytes_to_write) != 0) { | |
588 | retval = -EFAULT; | |
589 | goto exit; | |
590 | } | |
591 | ||
592 | /* send off the urb */ | |
593 | usb_fill_int_urb( | |
594 | dev->interrupt_out_urb, | |
595 | dev->udev, | |
596 | usb_sndintpipe(dev->udev, dev->interrupt_out_endpoint->bEndpointAddress), | |
597 | dev->interrupt_out_buffer, | |
598 | bytes_to_write, | |
599 | adu_interrupt_out_callback, | |
600 | dev, | |
f08812d5 | 601 | dev->interrupt_out_endpoint->bInterval); |
03270634 | 602 | dev->interrupt_out_urb->actual_length = bytes_to_write; |
f08812d5 | 603 | dev->out_urb_finished = 0; |
03270634 SH |
604 | retval = usb_submit_urb(dev->interrupt_out_urb, GFP_KERNEL); |
605 | if (retval < 0) { | |
f08812d5 | 606 | dev->out_urb_finished = 1; |
fd3f1917 GKH |
607 | dev_err(&dev->udev->dev, "Couldn't submit " |
608 | "interrupt_out_urb %d\n", retval); | |
03270634 SH |
609 | goto exit; |
610 | } | |
611 | ||
612 | buffer += bytes_to_write; | |
613 | count -= bytes_to_write; | |
614 | ||
615 | bytes_written += bytes_to_write; | |
616 | } | |
617 | } | |
f08812d5 PZ |
618 | mutex_unlock(&dev->mtx); |
619 | return bytes_written; | |
03270634 SH |
620 | |
621 | exit: | |
8293c568 | 622 | mutex_unlock(&dev->mtx); |
ebc3ac14 | 623 | exit_nolock: |
f08812d5 | 624 | return retval; |
03270634 | 625 | |
f08812d5 PZ |
626 | exit_onqueue: |
627 | remove_wait_queue(&dev->write_wait, &waita); | |
03270634 SH |
628 | return retval; |
629 | } | |
630 | ||
631 | /* file operations needed when we register this driver */ | |
00977a59 | 632 | static const struct file_operations adu_fops = { |
03270634 SH |
633 | .owner = THIS_MODULE, |
634 | .read = adu_read, | |
635 | .write = adu_write, | |
636 | .open = adu_open, | |
637 | .release = adu_release, | |
6038f373 | 638 | .llseek = noop_llseek, |
03270634 SH |
639 | }; |
640 | ||
641 | /* | |
642 | * usb class driver info in order to get a minor number from the usb core, | |
643 | * and to have the device registered with devfs and the driver core | |
644 | */ | |
645 | static struct usb_class_driver adu_class = { | |
646 | .name = "usb/adutux%d", | |
647 | .fops = &adu_fops, | |
648 | .minor_base = ADU_MINOR_BASE, | |
649 | }; | |
650 | ||
651 | /** | |
652 | * adu_probe | |
653 | * | |
654 | * Called by the usb core when a new device is connected that it thinks | |
655 | * this driver might be interested in. | |
656 | */ | |
657 | static int adu_probe(struct usb_interface *interface, | |
658 | const struct usb_device_id *id) | |
659 | { | |
660 | struct usb_device *udev = interface_to_usbdev(interface); | |
661 | struct adu_device *dev = NULL; | |
662 | struct usb_host_interface *iface_desc; | |
663 | struct usb_endpoint_descriptor *endpoint; | |
664 | int retval = -ENODEV; | |
665 | int in_end_size; | |
666 | int out_end_size; | |
667 | int i; | |
668 | ||
03270634 SH |
669 | if (udev == NULL) { |
670 | dev_err(&interface->dev, "udev is NULL.\n"); | |
671 | goto exit; | |
672 | } | |
673 | ||
b595076a | 674 | /* allocate memory for our device state and initialize it */ |
03270634 SH |
675 | dev = kzalloc(sizeof(struct adu_device), GFP_KERNEL); |
676 | if (dev == NULL) { | |
677 | dev_err(&interface->dev, "Out of memory\n"); | |
678 | retval = -ENOMEM; | |
679 | goto exit; | |
680 | } | |
681 | ||
8293c568 | 682 | mutex_init(&dev->mtx); |
03270634 SH |
683 | spin_lock_init(&dev->buflock); |
684 | dev->udev = udev; | |
685 | init_waitqueue_head(&dev->read_wait); | |
686 | init_waitqueue_head(&dev->write_wait); | |
687 | ||
688 | iface_desc = &interface->altsetting[0]; | |
689 | ||
690 | /* set up the endpoint information */ | |
691 | for (i = 0; i < iface_desc->desc.bNumEndpoints; ++i) { | |
692 | endpoint = &iface_desc->endpoint[i].desc; | |
693 | ||
694 | if (usb_endpoint_is_int_in(endpoint)) | |
695 | dev->interrupt_in_endpoint = endpoint; | |
696 | ||
697 | if (usb_endpoint_is_int_out(endpoint)) | |
698 | dev->interrupt_out_endpoint = endpoint; | |
699 | } | |
700 | if (dev->interrupt_in_endpoint == NULL) { | |
701 | dev_err(&interface->dev, "interrupt in endpoint not found\n"); | |
702 | goto error; | |
703 | } | |
704 | if (dev->interrupt_out_endpoint == NULL) { | |
705 | dev_err(&interface->dev, "interrupt out endpoint not found\n"); | |
706 | goto error; | |
707 | } | |
708 | ||
29cc8897 KM |
709 | in_end_size = usb_endpoint_maxp(dev->interrupt_in_endpoint); |
710 | out_end_size = usb_endpoint_maxp(dev->interrupt_out_endpoint); | |
03270634 SH |
711 | |
712 | dev->read_buffer_primary = kmalloc((4 * in_end_size), GFP_KERNEL); | |
713 | if (!dev->read_buffer_primary) { | |
714 | dev_err(&interface->dev, "Couldn't allocate read_buffer_primary\n"); | |
715 | retval = -ENOMEM; | |
716 | goto error; | |
717 | } | |
718 | ||
719 | /* debug code prime the buffer */ | |
720 | memset(dev->read_buffer_primary, 'a', in_end_size); | |
721 | memset(dev->read_buffer_primary + in_end_size, 'b', in_end_size); | |
722 | memset(dev->read_buffer_primary + (2 * in_end_size), 'c', in_end_size); | |
723 | memset(dev->read_buffer_primary + (3 * in_end_size), 'd', in_end_size); | |
724 | ||
725 | dev->read_buffer_secondary = kmalloc((4 * in_end_size), GFP_KERNEL); | |
726 | if (!dev->read_buffer_secondary) { | |
727 | dev_err(&interface->dev, "Couldn't allocate read_buffer_secondary\n"); | |
728 | retval = -ENOMEM; | |
729 | goto error; | |
730 | } | |
731 | ||
732 | /* debug code prime the buffer */ | |
733 | memset(dev->read_buffer_secondary, 'e', in_end_size); | |
734 | memset(dev->read_buffer_secondary + in_end_size, 'f', in_end_size); | |
735 | memset(dev->read_buffer_secondary + (2 * in_end_size), 'g', in_end_size); | |
736 | memset(dev->read_buffer_secondary + (3 * in_end_size), 'h', in_end_size); | |
737 | ||
738 | dev->interrupt_in_buffer = kmalloc(in_end_size, GFP_KERNEL); | |
739 | if (!dev->interrupt_in_buffer) { | |
740 | dev_err(&interface->dev, "Couldn't allocate interrupt_in_buffer\n"); | |
741 | goto error; | |
742 | } | |
743 | ||
744 | /* debug code prime the buffer */ | |
745 | memset(dev->interrupt_in_buffer, 'i', in_end_size); | |
746 | ||
747 | dev->interrupt_in_urb = usb_alloc_urb(0, GFP_KERNEL); | |
748 | if (!dev->interrupt_in_urb) { | |
749 | dev_err(&interface->dev, "Couldn't allocate interrupt_in_urb\n"); | |
750 | goto error; | |
751 | } | |
752 | dev->interrupt_out_buffer = kmalloc(out_end_size, GFP_KERNEL); | |
753 | if (!dev->interrupt_out_buffer) { | |
754 | dev_err(&interface->dev, "Couldn't allocate interrupt_out_buffer\n"); | |
755 | goto error; | |
756 | } | |
757 | dev->interrupt_out_urb = usb_alloc_urb(0, GFP_KERNEL); | |
758 | if (!dev->interrupt_out_urb) { | |
759 | dev_err(&interface->dev, "Couldn't allocate interrupt_out_urb\n"); | |
760 | goto error; | |
761 | } | |
762 | ||
763 | if (!usb_string(udev, udev->descriptor.iSerialNumber, dev->serial_number, | |
764 | sizeof(dev->serial_number))) { | |
765 | dev_err(&interface->dev, "Could not retrieve serial number\n"); | |
766 | goto error; | |
767 | } | |
66d4bc30 | 768 | dev_dbg(&interface->dev,"serial_number=%s", dev->serial_number); |
03270634 SH |
769 | |
770 | /* we can register the device now, as it is ready */ | |
771 | usb_set_intfdata(interface, dev); | |
772 | ||
773 | retval = usb_register_dev(interface, &adu_class); | |
774 | ||
775 | if (retval) { | |
776 | /* something prevented us from registering this driver */ | |
777 | dev_err(&interface->dev, "Not able to get a minor for this device.\n"); | |
778 | usb_set_intfdata(interface, NULL); | |
779 | goto error; | |
780 | } | |
781 | ||
782 | dev->minor = interface->minor; | |
783 | ||
784 | /* let the user know what node this device is now attached to */ | |
898eb71c | 785 | dev_info(&interface->dev, "ADU%d %s now attached to /dev/usb/adutux%d\n", |
d482b9d5 | 786 | le16_to_cpu(udev->descriptor.idProduct), dev->serial_number, |
03270634 SH |
787 | (dev->minor - ADU_MINOR_BASE)); |
788 | exit: | |
03270634 SH |
789 | return retval; |
790 | ||
791 | error: | |
792 | adu_delete(dev); | |
793 | return retval; | |
794 | } | |
795 | ||
796 | /** | |
797 | * adu_disconnect | |
798 | * | |
799 | * Called by the usb core when the device is removed from the system. | |
800 | */ | |
801 | static void adu_disconnect(struct usb_interface *interface) | |
802 | { | |
803 | struct adu_device *dev; | |
804 | int minor; | |
805 | ||
03270634 | 806 | dev = usb_get_intfdata(interface); |
03270634 | 807 | |
f08812d5 PZ |
808 | mutex_lock(&dev->mtx); /* not interruptible */ |
809 | dev->udev = NULL; /* poison */ | |
03270634 | 810 | minor = dev->minor; |
03270634 | 811 | usb_deregister_dev(interface, &adu_class); |
f08812d5 | 812 | mutex_unlock(&dev->mtx); |
03270634 | 813 | |
f08812d5 PZ |
814 | mutex_lock(&adutux_mutex); |
815 | usb_set_intfdata(interface, NULL); | |
d4ead16f | 816 | |
03270634 | 817 | /* if the device is not opened, then we clean up right now */ |
66d4bc30 GKH |
818 | dev_dbg(&dev->udev->dev, "%s : open count %d\n", |
819 | __func__, dev->open_count); | |
f08812d5 | 820 | if (!dev->open_count) |
03270634 | 821 | adu_delete(dev); |
f08812d5 PZ |
822 | |
823 | mutex_unlock(&adutux_mutex); | |
03270634 | 824 | |
898eb71c | 825 | dev_info(&interface->dev, "ADU device adutux%d now disconnected\n", |
03270634 | 826 | (minor - ADU_MINOR_BASE)); |
03270634 SH |
827 | } |
828 | ||
829 | /* usb specific object needed to register this driver with the usb subsystem */ | |
830 | static struct usb_driver adu_driver = { | |
831 | .name = "adutux", | |
832 | .probe = adu_probe, | |
833 | .disconnect = adu_disconnect, | |
834 | .id_table = device_table, | |
835 | }; | |
836 | ||
65db4305 | 837 | module_usb_driver(adu_driver); |
03270634 SH |
838 | |
839 | MODULE_AUTHOR(DRIVER_AUTHOR); | |
840 | MODULE_DESCRIPTION(DRIVER_DESC); | |
841 | MODULE_LICENSE("GPL"); |