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5fd54ace | 1 | // SPDX-License-Identifier: GPL-2.0+ |
03270634 SH |
2 | /* |
3 | * adutux - driver for ADU devices from Ontrak Control Systems | |
4 | * This is an experimental driver. Use at your own risk. | |
5 | * This driver is not supported by Ontrak Control Systems. | |
6 | * | |
7 | * Copyright (c) 2003 John Homppi (SCO, leave this notice here) | |
8 | * | |
03270634 SH |
9 | * derived from the Lego USB Tower driver 0.56: |
10 | * Copyright (c) 2003 David Glance <davidgsf@sourceforge.net> | |
11 | * 2001 Juergen Stuber <stuber@loria.fr> | |
12 | * that was derived from USB Skeleton driver - 0.5 | |
13 | * Copyright (c) 2001 Greg Kroah-Hartman (greg@kroah.com) | |
14 | * | |
15 | */ | |
16 | ||
28f47c34 GKH |
17 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
18 | ||
03270634 | 19 | #include <linux/kernel.h> |
174cd4b1 | 20 | #include <linux/sched/signal.h> |
03270634 | 21 | #include <linux/errno.h> |
03270634 SH |
22 | #include <linux/slab.h> |
23 | #include <linux/module.h> | |
24 | #include <linux/usb.h> | |
8293c568 | 25 | #include <linux/mutex.h> |
40cf4833 | 26 | #include <linux/uaccess.h> |
03270634 | 27 | |
03270634 SH |
28 | #define DRIVER_AUTHOR "John Homppi" |
29 | #define DRIVER_DESC "adutux (see www.ontrak.net)" | |
30 | ||
03270634 SH |
31 | /* Define these values to match your device */ |
32 | #define ADU_VENDOR_ID 0x0a07 | |
33 | #define ADU_PRODUCT_ID 0x0064 | |
34 | ||
35 | /* table of devices that work with this driver */ | |
33b9e162 | 36 | static const struct usb_device_id device_table[] = { |
03270634 | 37 | { USB_DEVICE(ADU_VENDOR_ID, ADU_PRODUCT_ID) }, /* ADU100 */ |
eb79c01a LN |
38 | { USB_DEVICE(ADU_VENDOR_ID, ADU_PRODUCT_ID+20) }, /* ADU120 */ |
39 | { USB_DEVICE(ADU_VENDOR_ID, ADU_PRODUCT_ID+30) }, /* ADU130 */ | |
03270634 SH |
40 | { USB_DEVICE(ADU_VENDOR_ID, ADU_PRODUCT_ID+100) }, /* ADU200 */ |
41 | { USB_DEVICE(ADU_VENDOR_ID, ADU_PRODUCT_ID+108) }, /* ADU208 */ | |
42 | { USB_DEVICE(ADU_VENDOR_ID, ADU_PRODUCT_ID+118) }, /* ADU218 */ | |
83fc1fcd | 43 | { } /* Terminating entry */ |
03270634 SH |
44 | }; |
45 | ||
46 | MODULE_DEVICE_TABLE(usb, device_table); | |
47 | ||
48 | #ifdef CONFIG_USB_DYNAMIC_MINORS | |
49 | #define ADU_MINOR_BASE 0 | |
50 | #else | |
51 | #define ADU_MINOR_BASE 67 | |
52 | #endif | |
53 | ||
54 | /* we can have up to this number of device plugged in at once */ | |
55 | #define MAX_DEVICES 16 | |
56 | ||
cc9debf8 | 57 | #define COMMAND_TIMEOUT (2*HZ) |
03270634 | 58 | |
f08812d5 PZ |
59 | /* |
60 | * The locking scheme is a vanilla 3-lock: | |
61 | * adu_device.buflock: A spinlock, covers what IRQs touch. | |
62 | * adutux_mutex: A Static lock to cover open_count. It would also cover | |
63 | * any globals, but we don't have them in 2.6. | |
64 | * adu_device.mtx: A mutex to hold across sleepers like copy_from_user. | |
65 | * It covers all of adu_device, except the open_count | |
66 | * and what .buflock covers. | |
67 | */ | |
68 | ||
03270634 SH |
69 | /* Structure to hold all of our device specific stuff */ |
70 | struct adu_device { | |
f08812d5 | 71 | struct mutex mtx; |
30c5c649 LN |
72 | struct usb_device *udev; /* save off the usb device pointer */ |
73 | struct usb_interface *interface; | |
f08812d5 | 74 | unsigned int minor; /* the starting minor number for this device */ |
03270634 SH |
75 | char serial_number[8]; |
76 | ||
77 | int open_count; /* number of times this port has been opened */ | |
b2fa7bae | 78 | unsigned long disconnected:1; |
03270634 | 79 | |
30c5c649 | 80 | char *read_buffer_primary; |
03270634 | 81 | int read_buffer_length; |
30c5c649 | 82 | char *read_buffer_secondary; |
03270634 SH |
83 | int secondary_head; |
84 | int secondary_tail; | |
85 | spinlock_t buflock; | |
86 | ||
87 | wait_queue_head_t read_wait; | |
88 | wait_queue_head_t write_wait; | |
89 | ||
30c5c649 LN |
90 | char *interrupt_in_buffer; |
91 | struct usb_endpoint_descriptor *interrupt_in_endpoint; | |
92 | struct urb *interrupt_in_urb; | |
03270634 SH |
93 | int read_urb_finished; |
94 | ||
30c5c649 LN |
95 | char *interrupt_out_buffer; |
96 | struct usb_endpoint_descriptor *interrupt_out_endpoint; | |
97 | struct urb *interrupt_out_urb; | |
f08812d5 | 98 | int out_urb_finished; |
03270634 SH |
99 | }; |
100 | ||
f08812d5 PZ |
101 | static DEFINE_MUTEX(adutux_mutex); |
102 | ||
03270634 SH |
103 | static struct usb_driver adu_driver; |
104 | ||
1ef37c60 GKH |
105 | static inline void adu_debug_data(struct device *dev, const char *function, |
106 | int size, const unsigned char *data) | |
03270634 | 107 | { |
1ef37c60 GKH |
108 | dev_dbg(dev, "%s - length = %d, data = %*ph\n", |
109 | function, size, size, data); | |
03270634 SH |
110 | } |
111 | ||
874ae838 | 112 | /* |
03270634 SH |
113 | * adu_abort_transfers |
114 | * aborts transfers and frees associated data structures | |
115 | */ | |
116 | static void adu_abort_transfers(struct adu_device *dev) | |
117 | { | |
f08812d5 | 118 | unsigned long flags; |
03270634 | 119 | |
b2fa7bae | 120 | if (dev->disconnected) |
6e42a158 | 121 | return; |
03270634 | 122 | |
03270634 | 123 | /* shutdown transfer */ |
f08812d5 PZ |
124 | |
125 | /* XXX Anchor these instead */ | |
126 | spin_lock_irqsave(&dev->buflock, flags); | |
127 | if (!dev->read_urb_finished) { | |
128 | spin_unlock_irqrestore(&dev->buflock, flags); | |
129 | usb_kill_urb(dev->interrupt_in_urb); | |
130 | } else | |
131 | spin_unlock_irqrestore(&dev->buflock, flags); | |
132 | ||
133 | spin_lock_irqsave(&dev->buflock, flags); | |
134 | if (!dev->out_urb_finished) { | |
135 | spin_unlock_irqrestore(&dev->buflock, flags); | |
687ca639 KK |
136 | wait_event_timeout(dev->write_wait, dev->out_urb_finished, |
137 | COMMAND_TIMEOUT); | |
f08812d5 PZ |
138 | usb_kill_urb(dev->interrupt_out_urb); |
139 | } else | |
140 | spin_unlock_irqrestore(&dev->buflock, flags); | |
03270634 SH |
141 | } |
142 | ||
143 | static void adu_delete(struct adu_device *dev) | |
144 | { | |
03270634 SH |
145 | /* free data structures */ |
146 | usb_free_urb(dev->interrupt_in_urb); | |
147 | usb_free_urb(dev->interrupt_out_urb); | |
148 | kfree(dev->read_buffer_primary); | |
149 | kfree(dev->read_buffer_secondary); | |
150 | kfree(dev->interrupt_in_buffer); | |
151 | kfree(dev->interrupt_out_buffer); | |
123a0f12 | 152 | usb_put_dev(dev->udev); |
03270634 | 153 | kfree(dev); |
03270634 SH |
154 | } |
155 | ||
7d12e780 | 156 | static void adu_interrupt_in_callback(struct urb *urb) |
03270634 SH |
157 | { |
158 | struct adu_device *dev = urb->context; | |
24497a00 | 159 | int status = urb->status; |
957ada71 | 160 | unsigned long flags; |
03270634 | 161 | |
1ef37c60 GKH |
162 | adu_debug_data(&dev->udev->dev, __func__, |
163 | urb->actual_length, urb->transfer_buffer); | |
03270634 | 164 | |
957ada71 | 165 | spin_lock_irqsave(&dev->buflock, flags); |
03270634 | 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; | |
957ada71 | 196 | spin_unlock_irqrestore(&dev->buflock, flags); |
03270634 SH |
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; |
957ada71 | 205 | unsigned long flags; |
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) && | |
c56150c1 | 212 | (status != -ESHUTDOWN) && |
24497a00 | 213 | (status != -ECONNRESET)) { |
66d4bc30 GKH |
214 | dev_dbg(&dev->udev->dev, |
215 | "%s :nonzero status received: %d\n", __func__, | |
216 | status); | |
03270634 | 217 | } |
1ef37c60 | 218 | return; |
03270634 SH |
219 | } |
220 | ||
957ada71 | 221 | spin_lock_irqsave(&dev->buflock, flags); |
f08812d5 PZ |
222 | dev->out_urb_finished = 1; |
223 | wake_up(&dev->write_wait); | |
957ada71 | 224 | spin_unlock_irqrestore(&dev->buflock, flags); |
03270634 SH |
225 | } |
226 | ||
227 | static int adu_open(struct inode *inode, struct file *file) | |
228 | { | |
229 | struct adu_device *dev = NULL; | |
230 | struct usb_interface *interface; | |
231 | int subminor; | |
f08812d5 | 232 | int retval; |
03270634 | 233 | |
03270634 SH |
234 | subminor = iminor(inode); |
235 | ||
e77c4e6a | 236 | retval = mutex_lock_interruptible(&adutux_mutex); |
66d4bc30 | 237 | if (retval) |
f08812d5 | 238 | goto exit_no_lock; |
f08812d5 | 239 | |
03270634 SH |
240 | interface = usb_find_interface(&adu_driver, subminor); |
241 | if (!interface) { | |
28f47c34 GKH |
242 | pr_err("%s - error, can't find device for minor %d\n", |
243 | __func__, subminor); | |
03270634 SH |
244 | retval = -ENODEV; |
245 | goto exit_no_device; | |
246 | } | |
247 | ||
248 | dev = usb_get_intfdata(interface); | |
b2fa7bae | 249 | if (!dev) { |
03270634 SH |
250 | retval = -ENODEV; |
251 | goto exit_no_device; | |
252 | } | |
253 | ||
f08812d5 PZ |
254 | /* check that nobody else is using the device */ |
255 | if (dev->open_count) { | |
256 | retval = -EBUSY; | |
03270634 SH |
257 | goto exit_no_device; |
258 | } | |
259 | ||
03270634 | 260 | ++dev->open_count; |
66d4bc30 GKH |
261 | dev_dbg(&dev->udev->dev, "%s: open count %d\n", __func__, |
262 | dev->open_count); | |
03270634 SH |
263 | |
264 | /* save device in the file's private structure */ | |
265 | file->private_data = dev; | |
266 | ||
f08812d5 PZ |
267 | /* initialize in direction */ |
268 | dev->read_buffer_length = 0; | |
03270634 | 269 | |
f08812d5 | 270 | /* fixup first read by having urb waiting for it */ |
05d76399 | 271 | usb_fill_int_urb(dev->interrupt_in_urb, dev->udev, |
f08812d5 PZ |
272 | usb_rcvintpipe(dev->udev, |
273 | dev->interrupt_in_endpoint->bEndpointAddress), | |
274 | dev->interrupt_in_buffer, | |
29cc8897 | 275 | usb_endpoint_maxp(dev->interrupt_in_endpoint), |
f08812d5 PZ |
276 | adu_interrupt_in_callback, dev, |
277 | dev->interrupt_in_endpoint->bInterval); | |
278 | dev->read_urb_finished = 0; | |
279 | if (usb_submit_urb(dev->interrupt_in_urb, GFP_KERNEL)) | |
280 | dev->read_urb_finished = 1; | |
281 | /* we ignore failure */ | |
282 | /* end of fixup for first read */ | |
283 | ||
284 | /* initialize out direction */ | |
285 | dev->out_urb_finished = 1; | |
286 | ||
287 | retval = 0; | |
03270634 SH |
288 | |
289 | exit_no_device: | |
f08812d5 PZ |
290 | mutex_unlock(&adutux_mutex); |
291 | exit_no_lock: | |
03270634 SH |
292 | return retval; |
293 | } | |
294 | ||
f08812d5 | 295 | static void adu_release_internal(struct adu_device *dev) |
03270634 | 296 | { |
03270634 SH |
297 | /* decrement our usage count for the device */ |
298 | --dev->open_count; | |
66d4bc30 GKH |
299 | dev_dbg(&dev->udev->dev, "%s : open count %d\n", __func__, |
300 | dev->open_count); | |
03270634 SH |
301 | if (dev->open_count <= 0) { |
302 | adu_abort_transfers(dev); | |
303 | dev->open_count = 0; | |
304 | } | |
03270634 SH |
305 | } |
306 | ||
307 | static int adu_release(struct inode *inode, struct file *file) | |
308 | { | |
f08812d5 | 309 | struct adu_device *dev; |
03270634 SH |
310 | int retval = 0; |
311 | ||
03270634 | 312 | if (file == NULL) { |
03270634 SH |
313 | retval = -ENODEV; |
314 | goto exit; | |
315 | } | |
316 | ||
317 | dev = file->private_data; | |
03270634 | 318 | if (dev == NULL) { |
03270634 SH |
319 | retval = -ENODEV; |
320 | goto exit; | |
321 | } | |
322 | ||
f08812d5 | 323 | mutex_lock(&adutux_mutex); /* not interruptible */ |
03270634 SH |
324 | |
325 | if (dev->open_count <= 0) { | |
66d4bc30 | 326 | dev_dbg(&dev->udev->dev, "%s : device not opened\n", __func__); |
03270634 | 327 | retval = -ENODEV; |
46c9844c | 328 | goto unlock; |
03270634 SH |
329 | } |
330 | ||
f08812d5 | 331 | adu_release_internal(dev); |
b2fa7bae | 332 | if (dev->disconnected) { |
d4ead16f | 333 | /* the device was unplugged before the file was released */ |
f08812d5 PZ |
334 | if (!dev->open_count) /* ... and we're the last user */ |
335 | adu_delete(dev); | |
d4ead16f | 336 | } |
46c9844c | 337 | unlock: |
f08812d5 | 338 | mutex_unlock(&adutux_mutex); |
46c9844c | 339 | exit: |
03270634 SH |
340 | return retval; |
341 | } | |
342 | ||
343 | static ssize_t adu_read(struct file *file, __user char *buffer, size_t count, | |
344 | loff_t *ppos) | |
345 | { | |
346 | struct adu_device *dev; | |
347 | size_t bytes_read = 0; | |
348 | size_t bytes_to_read = count; | |
03270634 SH |
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 */ | |
b2fa7bae | 360 | if (dev->disconnected) { |
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 | 375 | while (bytes_to_read) { |
4850f26a | 376 | size_t data_in_secondary = dev->secondary_tail - dev->secondary_head; |
66d4bc30 | 377 | dev_dbg(&dev->udev->dev, |
4850f26a | 378 | "%s : while, data_in_secondary=%zu, status=%d\n", |
66d4bc30 GKH |
379 | __func__, data_in_secondary, |
380 | dev->interrupt_in_urb->status); | |
03270634 SH |
381 | |
382 | if (data_in_secondary) { | |
383 | /* drain secondary buffer */ | |
4850f26a DG |
384 | size_t amount = min(bytes_to_read, data_in_secondary); |
385 | if (copy_to_user(buffer, dev->read_buffer_secondary+dev->secondary_head, amount)) { | |
03270634 SH |
386 | retval = -EFAULT; |
387 | goto exit; | |
388 | } | |
4850f26a DG |
389 | dev->secondary_head += amount; |
390 | bytes_read += amount; | |
391 | bytes_to_read -= amount; | |
03270634 SH |
392 | } else { |
393 | /* we check the primary buffer */ | |
394 | spin_lock_irqsave (&dev->buflock, flags); | |
395 | if (dev->read_buffer_length) { | |
396 | /* we secure access to the primary */ | |
397 | char *tmp; | |
66d4bc30 GKH |
398 | dev_dbg(&dev->udev->dev, |
399 | "%s : swap, read_buffer_length = %d\n", | |
400 | __func__, dev->read_buffer_length); | |
03270634 SH |
401 | tmp = dev->read_buffer_secondary; |
402 | dev->read_buffer_secondary = dev->read_buffer_primary; | |
403 | dev->read_buffer_primary = tmp; | |
404 | dev->secondary_head = 0; | |
405 | dev->secondary_tail = dev->read_buffer_length; | |
406 | dev->read_buffer_length = 0; | |
407 | spin_unlock_irqrestore(&dev->buflock, flags); | |
408 | /* we have a free buffer so use it */ | |
409 | should_submit = 1; | |
410 | } else { | |
411 | /* even the primary was empty - we may need to do IO */ | |
f08812d5 | 412 | if (!dev->read_urb_finished) { |
03270634 SH |
413 | /* somebody is doing IO */ |
414 | spin_unlock_irqrestore(&dev->buflock, flags); | |
66d4bc30 GKH |
415 | dev_dbg(&dev->udev->dev, |
416 | "%s : submitted already\n", | |
417 | __func__); | |
03270634 SH |
418 | } else { |
419 | /* we must initiate input */ | |
66d4bc30 GKH |
420 | dev_dbg(&dev->udev->dev, |
421 | "%s : initiate input\n", | |
422 | __func__); | |
03270634 | 423 | dev->read_urb_finished = 0; |
f08812d5 | 424 | spin_unlock_irqrestore(&dev->buflock, flags); |
03270634 | 425 | |
05d76399 | 426 | usb_fill_int_urb(dev->interrupt_in_urb, dev->udev, |
eb79c01a LN |
427 | usb_rcvintpipe(dev->udev, |
428 | dev->interrupt_in_endpoint->bEndpointAddress), | |
03270634 | 429 | dev->interrupt_in_buffer, |
29cc8897 | 430 | usb_endpoint_maxp(dev->interrupt_in_endpoint), |
03270634 SH |
431 | adu_interrupt_in_callback, |
432 | dev, | |
433 | dev->interrupt_in_endpoint->bInterval); | |
f08812d5 PZ |
434 | retval = usb_submit_urb(dev->interrupt_in_urb, GFP_KERNEL); |
435 | if (retval) { | |
436 | dev->read_urb_finished = 1; | |
03270634 SH |
437 | if (retval == -ENOMEM) { |
438 | retval = bytes_read ? bytes_read : -ENOMEM; | |
439 | } | |
66d4bc30 GKH |
440 | dev_dbg(&dev->udev->dev, |
441 | "%s : submit failed\n", | |
442 | __func__); | |
03270634 SH |
443 | goto exit; |
444 | } | |
445 | } | |
446 | ||
447 | /* we wait for I/O to complete */ | |
448 | set_current_state(TASK_INTERRUPTIBLE); | |
449 | add_wait_queue(&dev->read_wait, &wait); | |
f08812d5 PZ |
450 | spin_lock_irqsave(&dev->buflock, flags); |
451 | if (!dev->read_urb_finished) { | |
452 | spin_unlock_irqrestore(&dev->buflock, flags); | |
03270634 | 453 | timeout = schedule_timeout(COMMAND_TIMEOUT); |
f08812d5 PZ |
454 | } else { |
455 | spin_unlock_irqrestore(&dev->buflock, flags); | |
03270634 | 456 | set_current_state(TASK_RUNNING); |
f08812d5 | 457 | } |
03270634 SH |
458 | remove_wait_queue(&dev->read_wait, &wait); |
459 | ||
460 | if (timeout <= 0) { | |
66d4bc30 GKH |
461 | dev_dbg(&dev->udev->dev, |
462 | "%s : timeout\n", __func__); | |
03270634 SH |
463 | retval = bytes_read ? bytes_read : -ETIMEDOUT; |
464 | goto exit; | |
465 | } | |
466 | ||
467 | if (signal_pending(current)) { | |
66d4bc30 GKH |
468 | dev_dbg(&dev->udev->dev, |
469 | "%s : signal pending\n", | |
470 | __func__); | |
03270634 SH |
471 | retval = bytes_read ? bytes_read : -EINTR; |
472 | goto exit; | |
473 | } | |
474 | } | |
475 | } | |
476 | } | |
477 | ||
478 | retval = bytes_read; | |
479 | /* if the primary buffer is empty then use it */ | |
f08812d5 PZ |
480 | spin_lock_irqsave(&dev->buflock, flags); |
481 | if (should_submit && dev->read_urb_finished) { | |
482 | dev->read_urb_finished = 0; | |
483 | spin_unlock_irqrestore(&dev->buflock, flags); | |
05d76399 | 484 | usb_fill_int_urb(dev->interrupt_in_urb, dev->udev, |
03270634 | 485 | usb_rcvintpipe(dev->udev, |
eb79c01a | 486 | dev->interrupt_in_endpoint->bEndpointAddress), |
f08812d5 | 487 | dev->interrupt_in_buffer, |
29cc8897 | 488 | usb_endpoint_maxp(dev->interrupt_in_endpoint), |
f08812d5 PZ |
489 | adu_interrupt_in_callback, |
490 | dev, | |
491 | dev->interrupt_in_endpoint->bInterval); | |
492 | if (usb_submit_urb(dev->interrupt_in_urb, GFP_KERNEL) != 0) | |
493 | dev->read_urb_finished = 1; | |
03270634 | 494 | /* we ignore failure */ |
f08812d5 PZ |
495 | } else { |
496 | spin_unlock_irqrestore(&dev->buflock, flags); | |
03270634 SH |
497 | } |
498 | ||
499 | exit: | |
500 | /* unlock the device */ | |
8293c568 | 501 | mutex_unlock(&dev->mtx); |
03270634 | 502 | |
03270634 SH |
503 | return retval; |
504 | } | |
505 | ||
506 | static ssize_t adu_write(struct file *file, const __user char *buffer, | |
507 | size_t count, loff_t *ppos) | |
508 | { | |
f08812d5 | 509 | DECLARE_WAITQUEUE(waita, current); |
03270634 SH |
510 | struct adu_device *dev; |
511 | size_t bytes_written = 0; | |
512 | size_t bytes_to_write; | |
513 | size_t buffer_size; | |
f08812d5 | 514 | unsigned long flags; |
ebc3ac14 | 515 | int retval; |
03270634 | 516 | |
03270634 SH |
517 | dev = file->private_data; |
518 | ||
8293c568 | 519 | retval = mutex_lock_interruptible(&dev->mtx); |
ebc3ac14 ON |
520 | if (retval) |
521 | goto exit_nolock; | |
03270634 SH |
522 | |
523 | /* verify that the device wasn't unplugged */ | |
b2fa7bae | 524 | if (dev->disconnected) { |
03270634 | 525 | retval = -ENODEV; |
28f47c34 | 526 | pr_err("No device or device unplugged %d\n", retval); |
03270634 SH |
527 | goto exit; |
528 | } | |
529 | ||
530 | /* verify that we actually have some data to write */ | |
531 | if (count == 0) { | |
66d4bc30 GKH |
532 | dev_dbg(&dev->udev->dev, "%s : write request of 0 bytes\n", |
533 | __func__); | |
03270634 SH |
534 | goto exit; |
535 | } | |
536 | ||
03270634 | 537 | while (count > 0) { |
f08812d5 PZ |
538 | add_wait_queue(&dev->write_wait, &waita); |
539 | set_current_state(TASK_INTERRUPTIBLE); | |
540 | spin_lock_irqsave(&dev->buflock, flags); | |
541 | if (!dev->out_urb_finished) { | |
542 | spin_unlock_irqrestore(&dev->buflock, flags); | |
03270634 | 543 | |
f08812d5 PZ |
544 | mutex_unlock(&dev->mtx); |
545 | if (signal_pending(current)) { | |
66d4bc30 GKH |
546 | dev_dbg(&dev->udev->dev, "%s : interrupted\n", |
547 | __func__); | |
f08812d5 | 548 | set_current_state(TASK_RUNNING); |
03270634 | 549 | retval = -EINTR; |
f08812d5 | 550 | goto exit_onqueue; |
03270634 | 551 | } |
f08812d5 | 552 | if (schedule_timeout(COMMAND_TIMEOUT) == 0) { |
66d4bc30 GKH |
553 | dev_dbg(&dev->udev->dev, |
554 | "%s - command timed out.\n", __func__); | |
f08812d5 PZ |
555 | retval = -ETIMEDOUT; |
556 | goto exit_onqueue; | |
557 | } | |
558 | remove_wait_queue(&dev->write_wait, &waita); | |
8293c568 | 559 | retval = mutex_lock_interruptible(&dev->mtx); |
ebc3ac14 ON |
560 | if (retval) { |
561 | retval = bytes_written ? bytes_written : retval; | |
562 | goto exit_nolock; | |
563 | } | |
03270634 | 564 | |
66d4bc30 | 565 | dev_dbg(&dev->udev->dev, |
5b5e0928 | 566 | "%s : in progress, count = %zd\n", |
66d4bc30 | 567 | __func__, count); |
03270634 | 568 | } else { |
f08812d5 PZ |
569 | spin_unlock_irqrestore(&dev->buflock, flags); |
570 | set_current_state(TASK_RUNNING); | |
571 | remove_wait_queue(&dev->write_wait, &waita); | |
5b5e0928 | 572 | dev_dbg(&dev->udev->dev, "%s : sending, count = %zd\n", |
66d4bc30 | 573 | __func__, count); |
03270634 SH |
574 | |
575 | /* write the data into interrupt_out_buffer from userspace */ | |
29cc8897 | 576 | buffer_size = usb_endpoint_maxp(dev->interrupt_out_endpoint); |
03270634 | 577 | bytes_to_write = count > buffer_size ? buffer_size : count; |
66d4bc30 | 578 | dev_dbg(&dev->udev->dev, |
5b5e0928 | 579 | "%s : buffer_size = %zd, count = %zd, bytes_to_write = %zd\n", |
66d4bc30 | 580 | __func__, buffer_size, count, bytes_to_write); |
03270634 SH |
581 | |
582 | if (copy_from_user(dev->interrupt_out_buffer, buffer, bytes_to_write) != 0) { | |
583 | retval = -EFAULT; | |
584 | goto exit; | |
585 | } | |
586 | ||
587 | /* send off the urb */ | |
588 | usb_fill_int_urb( | |
589 | dev->interrupt_out_urb, | |
590 | dev->udev, | |
591 | usb_sndintpipe(dev->udev, dev->interrupt_out_endpoint->bEndpointAddress), | |
592 | dev->interrupt_out_buffer, | |
593 | bytes_to_write, | |
594 | adu_interrupt_out_callback, | |
595 | dev, | |
f08812d5 | 596 | dev->interrupt_out_endpoint->bInterval); |
03270634 | 597 | dev->interrupt_out_urb->actual_length = bytes_to_write; |
f08812d5 | 598 | dev->out_urb_finished = 0; |
03270634 SH |
599 | retval = usb_submit_urb(dev->interrupt_out_urb, GFP_KERNEL); |
600 | if (retval < 0) { | |
f08812d5 | 601 | dev->out_urb_finished = 1; |
fd3f1917 GKH |
602 | dev_err(&dev->udev->dev, "Couldn't submit " |
603 | "interrupt_out_urb %d\n", retval); | |
03270634 SH |
604 | goto exit; |
605 | } | |
606 | ||
607 | buffer += bytes_to_write; | |
608 | count -= bytes_to_write; | |
609 | ||
610 | bytes_written += bytes_to_write; | |
611 | } | |
612 | } | |
f08812d5 PZ |
613 | mutex_unlock(&dev->mtx); |
614 | return bytes_written; | |
03270634 SH |
615 | |
616 | exit: | |
8293c568 | 617 | mutex_unlock(&dev->mtx); |
ebc3ac14 | 618 | exit_nolock: |
f08812d5 | 619 | return retval; |
03270634 | 620 | |
f08812d5 PZ |
621 | exit_onqueue: |
622 | remove_wait_queue(&dev->write_wait, &waita); | |
03270634 SH |
623 | return retval; |
624 | } | |
625 | ||
626 | /* file operations needed when we register this driver */ | |
00977a59 | 627 | static const struct file_operations adu_fops = { |
03270634 SH |
628 | .owner = THIS_MODULE, |
629 | .read = adu_read, | |
630 | .write = adu_write, | |
631 | .open = adu_open, | |
632 | .release = adu_release, | |
6038f373 | 633 | .llseek = noop_llseek, |
03270634 SH |
634 | }; |
635 | ||
636 | /* | |
637 | * usb class driver info in order to get a minor number from the usb core, | |
638 | * and to have the device registered with devfs and the driver core | |
639 | */ | |
640 | static struct usb_class_driver adu_class = { | |
641 | .name = "usb/adutux%d", | |
642 | .fops = &adu_fops, | |
643 | .minor_base = ADU_MINOR_BASE, | |
644 | }; | |
645 | ||
874ae838 | 646 | /* |
03270634 SH |
647 | * adu_probe |
648 | * | |
649 | * Called by the usb core when a new device is connected that it thinks | |
650 | * this driver might be interested in. | |
651 | */ | |
652 | static int adu_probe(struct usb_interface *interface, | |
653 | const struct usb_device_id *id) | |
654 | { | |
655 | struct usb_device *udev = interface_to_usbdev(interface); | |
656 | struct adu_device *dev = NULL; | |
e0e90520 | 657 | int retval = -ENOMEM; |
03270634 SH |
658 | int in_end_size; |
659 | int out_end_size; | |
e53e0342 | 660 | int res; |
03270634 | 661 | |
b595076a | 662 | /* allocate memory for our device state and initialize it */ |
03270634 | 663 | dev = kzalloc(sizeof(struct adu_device), GFP_KERNEL); |
e0e90520 JH |
664 | if (!dev) |
665 | return -ENOMEM; | |
03270634 | 666 | |
8293c568 | 667 | mutex_init(&dev->mtx); |
03270634 | 668 | spin_lock_init(&dev->buflock); |
123a0f12 | 669 | dev->udev = usb_get_dev(udev); |
03270634 SH |
670 | init_waitqueue_head(&dev->read_wait); |
671 | init_waitqueue_head(&dev->write_wait); | |
672 | ||
3c11c4be | 673 | res = usb_find_common_endpoints_reverse(interface->cur_altsetting, |
e53e0342 JH |
674 | NULL, NULL, |
675 | &dev->interrupt_in_endpoint, | |
676 | &dev->interrupt_out_endpoint); | |
677 | if (res) { | |
678 | dev_err(&interface->dev, "interrupt endpoints not found\n"); | |
679 | retval = res; | |
03270634 SH |
680 | goto error; |
681 | } | |
682 | ||
29cc8897 KM |
683 | in_end_size = usb_endpoint_maxp(dev->interrupt_in_endpoint); |
684 | out_end_size = usb_endpoint_maxp(dev->interrupt_out_endpoint); | |
03270634 SH |
685 | |
686 | dev->read_buffer_primary = kmalloc((4 * in_end_size), GFP_KERNEL); | |
e0e90520 | 687 | if (!dev->read_buffer_primary) |
03270634 | 688 | goto error; |
03270634 SH |
689 | |
690 | /* debug code prime the buffer */ | |
691 | memset(dev->read_buffer_primary, 'a', in_end_size); | |
692 | memset(dev->read_buffer_primary + in_end_size, 'b', in_end_size); | |
693 | memset(dev->read_buffer_primary + (2 * in_end_size), 'c', in_end_size); | |
694 | memset(dev->read_buffer_primary + (3 * in_end_size), 'd', in_end_size); | |
695 | ||
696 | dev->read_buffer_secondary = kmalloc((4 * in_end_size), GFP_KERNEL); | |
e0e90520 | 697 | if (!dev->read_buffer_secondary) |
03270634 | 698 | goto error; |
03270634 SH |
699 | |
700 | /* debug code prime the buffer */ | |
701 | memset(dev->read_buffer_secondary, 'e', in_end_size); | |
702 | memset(dev->read_buffer_secondary + in_end_size, 'f', in_end_size); | |
703 | memset(dev->read_buffer_secondary + (2 * in_end_size), 'g', in_end_size); | |
704 | memset(dev->read_buffer_secondary + (3 * in_end_size), 'h', in_end_size); | |
705 | ||
706 | dev->interrupt_in_buffer = kmalloc(in_end_size, GFP_KERNEL); | |
a02b55c8 | 707 | if (!dev->interrupt_in_buffer) |
03270634 | 708 | goto error; |
03270634 SH |
709 | |
710 | /* debug code prime the buffer */ | |
711 | memset(dev->interrupt_in_buffer, 'i', in_end_size); | |
712 | ||
713 | dev->interrupt_in_urb = usb_alloc_urb(0, GFP_KERNEL); | |
71574a55 | 714 | if (!dev->interrupt_in_urb) |
03270634 | 715 | goto error; |
03270634 | 716 | dev->interrupt_out_buffer = kmalloc(out_end_size, GFP_KERNEL); |
a02b55c8 | 717 | if (!dev->interrupt_out_buffer) |
03270634 | 718 | goto error; |
03270634 | 719 | dev->interrupt_out_urb = usb_alloc_urb(0, GFP_KERNEL); |
71574a55 | 720 | if (!dev->interrupt_out_urb) |
03270634 | 721 | goto error; |
03270634 SH |
722 | |
723 | if (!usb_string(udev, udev->descriptor.iSerialNumber, dev->serial_number, | |
724 | sizeof(dev->serial_number))) { | |
725 | dev_err(&interface->dev, "Could not retrieve serial number\n"); | |
e0e90520 | 726 | retval = -EIO; |
03270634 SH |
727 | goto error; |
728 | } | |
66d4bc30 | 729 | dev_dbg(&interface->dev,"serial_number=%s", dev->serial_number); |
03270634 SH |
730 | |
731 | /* we can register the device now, as it is ready */ | |
732 | usb_set_intfdata(interface, dev); | |
733 | ||
734 | retval = usb_register_dev(interface, &adu_class); | |
735 | ||
736 | if (retval) { | |
737 | /* something prevented us from registering this driver */ | |
738 | dev_err(&interface->dev, "Not able to get a minor for this device.\n"); | |
739 | usb_set_intfdata(interface, NULL); | |
740 | goto error; | |
741 | } | |
742 | ||
743 | dev->minor = interface->minor; | |
744 | ||
745 | /* let the user know what node this device is now attached to */ | |
898eb71c | 746 | dev_info(&interface->dev, "ADU%d %s now attached to /dev/usb/adutux%d\n", |
d482b9d5 | 747 | le16_to_cpu(udev->descriptor.idProduct), dev->serial_number, |
03270634 | 748 | (dev->minor - ADU_MINOR_BASE)); |
e0e90520 JH |
749 | |
750 | return 0; | |
03270634 SH |
751 | |
752 | error: | |
753 | adu_delete(dev); | |
754 | return retval; | |
755 | } | |
756 | ||
874ae838 | 757 | /* |
03270634 SH |
758 | * adu_disconnect |
759 | * | |
760 | * Called by the usb core when the device is removed from the system. | |
761 | */ | |
762 | static void adu_disconnect(struct usb_interface *interface) | |
763 | { | |
764 | struct adu_device *dev; | |
03270634 | 765 | |
03270634 | 766 | dev = usb_get_intfdata(interface); |
03270634 | 767 | |
03270634 | 768 | usb_deregister_dev(interface, &adu_class); |
03270634 | 769 | |
b2fa7bae JH |
770 | usb_poison_urb(dev->interrupt_in_urb); |
771 | usb_poison_urb(dev->interrupt_out_urb); | |
772 | ||
f08812d5 PZ |
773 | mutex_lock(&adutux_mutex); |
774 | usb_set_intfdata(interface, NULL); | |
d4ead16f | 775 | |
44efc269 | 776 | mutex_lock(&dev->mtx); /* not interruptible */ |
b2fa7bae | 777 | dev->disconnected = 1; |
44efc269 JH |
778 | mutex_unlock(&dev->mtx); |
779 | ||
03270634 | 780 | /* if the device is not opened, then we clean up right now */ |
f08812d5 | 781 | if (!dev->open_count) |
03270634 | 782 | adu_delete(dev); |
f08812d5 PZ |
783 | |
784 | mutex_unlock(&adutux_mutex); | |
03270634 SH |
785 | } |
786 | ||
787 | /* usb specific object needed to register this driver with the usb subsystem */ | |
788 | static struct usb_driver adu_driver = { | |
789 | .name = "adutux", | |
790 | .probe = adu_probe, | |
791 | .disconnect = adu_disconnect, | |
792 | .id_table = device_table, | |
793 | }; | |
794 | ||
65db4305 | 795 | module_usb_driver(adu_driver); |
03270634 SH |
796 | |
797 | MODULE_AUTHOR(DRIVER_AUTHOR); | |
798 | MODULE_DESCRIPTION(DRIVER_DESC); | |
799 | MODULE_LICENSE("GPL"); |