x86/xen: resume timer irqs early
[linux/fpc-iii.git] / drivers / usb / misc / yurex.c
blobb6ab515bfc6c0b1be593ed99e10e86391e012525
1 /*
2 * Driver for Meywa-Denki & KAYAC YUREX
4 * Copyright (C) 2010 Tomoki Sekiyama (tomoki.sekiyama@gmail.com)
6 * This program is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU General Public License as
8 * published by the Free Software Foundation, version 2.
12 #include <linux/kernel.h>
13 #include <linux/errno.h>
14 #include <linux/init.h>
15 #include <linux/slab.h>
16 #include <linux/module.h>
17 #include <linux/kref.h>
18 #include <linux/mutex.h>
19 #include <linux/uaccess.h>
20 #include <linux/usb.h>
21 #include <linux/hid.h>
23 #define DRIVER_AUTHOR "Tomoki Sekiyama"
24 #define DRIVER_DESC "Driver for Meywa-Denki & KAYAC YUREX"
26 #define YUREX_VENDOR_ID 0x0c45
27 #define YUREX_PRODUCT_ID 0x1010
29 #define CMD_ACK '!'
30 #define CMD_ANIMATE 'A'
31 #define CMD_COUNT 'C'
32 #define CMD_LED 'L'
33 #define CMD_READ 'R'
34 #define CMD_SET 'S'
35 #define CMD_VERSION 'V'
36 #define CMD_EOF 0x0d
37 #define CMD_PADDING 0xff
39 #define YUREX_BUF_SIZE 8
40 #define YUREX_WRITE_TIMEOUT (HZ*2)
42 /* table of devices that work with this driver */
43 static struct usb_device_id yurex_table[] = {
44 { USB_DEVICE(YUREX_VENDOR_ID, YUREX_PRODUCT_ID) },
45 { } /* Terminating entry */
47 MODULE_DEVICE_TABLE(usb, yurex_table);
49 #ifdef CONFIG_USB_DYNAMIC_MINORS
50 #define YUREX_MINOR_BASE 0
51 #else
52 #define YUREX_MINOR_BASE 192
53 #endif
55 /* Structure to hold all of our device specific stuff */
56 struct usb_yurex {
57 struct usb_device *udev;
58 struct usb_interface *interface;
59 __u8 int_in_endpointAddr;
60 struct urb *urb; /* URB for interrupt in */
61 unsigned char *int_buffer; /* buffer for intterupt in */
62 struct urb *cntl_urb; /* URB for control msg */
63 struct usb_ctrlrequest *cntl_req; /* req for control msg */
64 unsigned char *cntl_buffer; /* buffer for control msg */
66 struct kref kref;
67 struct mutex io_mutex;
68 struct fasync_struct *async_queue;
69 wait_queue_head_t waitq;
71 spinlock_t lock;
72 __s64 bbu; /* BBU from device */
74 #define to_yurex_dev(d) container_of(d, struct usb_yurex, kref)
76 static struct usb_driver yurex_driver;
77 static const struct file_operations yurex_fops;
80 static void yurex_control_callback(struct urb *urb)
82 struct usb_yurex *dev = urb->context;
83 int status = urb->status;
85 if (status) {
86 dev_err(&urb->dev->dev, "%s - control failed: %d\n",
87 __func__, status);
88 wake_up_interruptible(&dev->waitq);
89 return;
91 /* on success, sender woken up by CMD_ACK int in, or timeout */
94 static void yurex_delete(struct kref *kref)
96 struct usb_yurex *dev = to_yurex_dev(kref);
98 dev_dbg(&dev->interface->dev, "%s\n", __func__);
100 usb_put_dev(dev->udev);
101 if (dev->cntl_urb) {
102 usb_kill_urb(dev->cntl_urb);
103 kfree(dev->cntl_req);
104 if (dev->cntl_buffer)
105 usb_free_coherent(dev->udev, YUREX_BUF_SIZE,
106 dev->cntl_buffer, dev->cntl_urb->transfer_dma);
107 usb_free_urb(dev->cntl_urb);
109 if (dev->urb) {
110 usb_kill_urb(dev->urb);
111 if (dev->int_buffer)
112 usb_free_coherent(dev->udev, YUREX_BUF_SIZE,
113 dev->int_buffer, dev->urb->transfer_dma);
114 usb_free_urb(dev->urb);
116 kfree(dev);
120 * usb class driver info in order to get a minor number from the usb core,
121 * and to have the device registered with the driver core
123 static struct usb_class_driver yurex_class = {
124 .name = "yurex%d",
125 .fops = &yurex_fops,
126 .minor_base = YUREX_MINOR_BASE,
129 static void yurex_interrupt(struct urb *urb)
131 struct usb_yurex *dev = urb->context;
132 unsigned char *buf = dev->int_buffer;
133 int status = urb->status;
134 unsigned long flags;
135 int retval, i;
137 switch (status) {
138 case 0: /*success*/
139 break;
140 case -EOVERFLOW:
141 dev_err(&dev->interface->dev,
142 "%s - overflow with length %d, actual length is %d\n",
143 __func__, YUREX_BUF_SIZE, dev->urb->actual_length);
144 case -ECONNRESET:
145 case -ENOENT:
146 case -ESHUTDOWN:
147 case -EILSEQ:
148 /* The device is terminated, clean up */
149 return;
150 default:
151 dev_err(&dev->interface->dev,
152 "%s - unknown status received: %d\n", __func__, status);
153 goto exit;
156 /* handle received message */
157 switch (buf[0]) {
158 case CMD_COUNT:
159 case CMD_READ:
160 if (buf[6] == CMD_EOF) {
161 spin_lock_irqsave(&dev->lock, flags);
162 dev->bbu = 0;
163 for (i = 1; i < 6; i++) {
164 dev->bbu += buf[i];
165 if (i != 5)
166 dev->bbu <<= 8;
168 dev_dbg(&dev->interface->dev, "%s count: %lld\n",
169 __func__, dev->bbu);
170 spin_unlock_irqrestore(&dev->lock, flags);
172 kill_fasync(&dev->async_queue, SIGIO, POLL_IN);
174 else
175 dev_dbg(&dev->interface->dev,
176 "data format error - no EOF\n");
177 break;
178 case CMD_ACK:
179 dev_dbg(&dev->interface->dev, "%s ack: %c\n",
180 __func__, buf[1]);
181 wake_up_interruptible(&dev->waitq);
182 break;
185 exit:
186 retval = usb_submit_urb(dev->urb, GFP_ATOMIC);
187 if (retval) {
188 dev_err(&dev->interface->dev, "%s - usb_submit_urb failed: %d\n",
189 __func__, retval);
193 static int yurex_probe(struct usb_interface *interface, const struct usb_device_id *id)
195 struct usb_yurex *dev;
196 struct usb_host_interface *iface_desc;
197 struct usb_endpoint_descriptor *endpoint;
198 int retval = -ENOMEM;
199 int i;
200 DEFINE_WAIT(wait);
202 /* allocate memory for our device state and initialize it */
203 dev = kzalloc(sizeof(*dev), GFP_KERNEL);
204 if (!dev) {
205 dev_err(&interface->dev, "Out of memory\n");
206 goto error;
208 kref_init(&dev->kref);
209 mutex_init(&dev->io_mutex);
210 spin_lock_init(&dev->lock);
211 init_waitqueue_head(&dev->waitq);
213 dev->udev = usb_get_dev(interface_to_usbdev(interface));
214 dev->interface = interface;
216 /* set up the endpoint information */
217 iface_desc = interface->cur_altsetting;
218 for (i = 0; i < iface_desc->desc.bNumEndpoints; i++) {
219 endpoint = &iface_desc->endpoint[i].desc;
221 if (usb_endpoint_is_int_in(endpoint)) {
222 dev->int_in_endpointAddr = endpoint->bEndpointAddress;
223 break;
226 if (!dev->int_in_endpointAddr) {
227 retval = -ENODEV;
228 dev_err(&interface->dev, "Could not find endpoints\n");
229 goto error;
233 /* allocate control URB */
234 dev->cntl_urb = usb_alloc_urb(0, GFP_KERNEL);
235 if (!dev->cntl_urb) {
236 dev_err(&interface->dev, "Could not allocate control URB\n");
237 goto error;
240 /* allocate buffer for control req */
241 dev->cntl_req = kmalloc(YUREX_BUF_SIZE, GFP_KERNEL);
242 if (!dev->cntl_req) {
243 dev_err(&interface->dev, "Could not allocate cntl_req\n");
244 goto error;
247 /* allocate buffer for control msg */
248 dev->cntl_buffer = usb_alloc_coherent(dev->udev, YUREX_BUF_SIZE,
249 GFP_KERNEL,
250 &dev->cntl_urb->transfer_dma);
251 if (!dev->cntl_buffer) {
252 dev_err(&interface->dev, "Could not allocate cntl_buffer\n");
253 goto error;
256 /* configure control URB */
257 dev->cntl_req->bRequestType = USB_DIR_OUT | USB_TYPE_CLASS |
258 USB_RECIP_INTERFACE;
259 dev->cntl_req->bRequest = HID_REQ_SET_REPORT;
260 dev->cntl_req->wValue = cpu_to_le16((HID_OUTPUT_REPORT + 1) << 8);
261 dev->cntl_req->wIndex = cpu_to_le16(iface_desc->desc.bInterfaceNumber);
262 dev->cntl_req->wLength = cpu_to_le16(YUREX_BUF_SIZE);
264 usb_fill_control_urb(dev->cntl_urb, dev->udev,
265 usb_sndctrlpipe(dev->udev, 0),
266 (void *)dev->cntl_req, dev->cntl_buffer,
267 YUREX_BUF_SIZE, yurex_control_callback, dev);
268 dev->cntl_urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
271 /* allocate interrupt URB */
272 dev->urb = usb_alloc_urb(0, GFP_KERNEL);
273 if (!dev->urb) {
274 dev_err(&interface->dev, "Could not allocate URB\n");
275 goto error;
278 /* allocate buffer for interrupt in */
279 dev->int_buffer = usb_alloc_coherent(dev->udev, YUREX_BUF_SIZE,
280 GFP_KERNEL, &dev->urb->transfer_dma);
281 if (!dev->int_buffer) {
282 dev_err(&interface->dev, "Could not allocate int_buffer\n");
283 goto error;
286 /* configure interrupt URB */
287 usb_fill_int_urb(dev->urb, dev->udev,
288 usb_rcvintpipe(dev->udev, dev->int_in_endpointAddr),
289 dev->int_buffer, YUREX_BUF_SIZE, yurex_interrupt,
290 dev, 1);
291 dev->urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
292 if (usb_submit_urb(dev->urb, GFP_KERNEL)) {
293 retval = -EIO;
294 dev_err(&interface->dev, "Could not submitting URB\n");
295 goto error;
298 /* save our data pointer in this interface device */
299 usb_set_intfdata(interface, dev);
301 /* we can register the device now, as it is ready */
302 retval = usb_register_dev(interface, &yurex_class);
303 if (retval) {
304 dev_err(&interface->dev,
305 "Not able to get a minor for this device.\n");
306 usb_set_intfdata(interface, NULL);
307 goto error;
310 dev->bbu = -1;
312 dev_info(&interface->dev,
313 "USB YUREX device now attached to Yurex #%d\n",
314 interface->minor);
316 return 0;
318 error:
319 if (dev)
320 /* this frees allocated memory */
321 kref_put(&dev->kref, yurex_delete);
322 return retval;
325 static void yurex_disconnect(struct usb_interface *interface)
327 struct usb_yurex *dev;
328 int minor = interface->minor;
330 dev = usb_get_intfdata(interface);
331 usb_set_intfdata(interface, NULL);
333 /* give back our minor */
334 usb_deregister_dev(interface, &yurex_class);
336 /* prevent more I/O from starting */
337 mutex_lock(&dev->io_mutex);
338 dev->interface = NULL;
339 mutex_unlock(&dev->io_mutex);
341 /* wakeup waiters */
342 kill_fasync(&dev->async_queue, SIGIO, POLL_IN);
343 wake_up_interruptible(&dev->waitq);
345 /* decrement our usage count */
346 kref_put(&dev->kref, yurex_delete);
348 dev_info(&interface->dev, "USB YUREX #%d now disconnected\n", minor);
351 static struct usb_driver yurex_driver = {
352 .name = "yurex",
353 .probe = yurex_probe,
354 .disconnect = yurex_disconnect,
355 .id_table = yurex_table,
359 static int yurex_fasync(int fd, struct file *file, int on)
361 struct usb_yurex *dev;
363 dev = (struct usb_yurex *)file->private_data;
364 return fasync_helper(fd, file, on, &dev->async_queue);
367 static int yurex_open(struct inode *inode, struct file *file)
369 struct usb_yurex *dev;
370 struct usb_interface *interface;
371 int subminor;
372 int retval = 0;
374 subminor = iminor(inode);
376 interface = usb_find_interface(&yurex_driver, subminor);
377 if (!interface) {
378 printk(KERN_ERR "%s - error, can't find device for minor %d",
379 __func__, subminor);
380 retval = -ENODEV;
381 goto exit;
384 dev = usb_get_intfdata(interface);
385 if (!dev) {
386 retval = -ENODEV;
387 goto exit;
390 /* increment our usage count for the device */
391 kref_get(&dev->kref);
393 /* save our object in the file's private structure */
394 mutex_lock(&dev->io_mutex);
395 file->private_data = dev;
396 mutex_unlock(&dev->io_mutex);
398 exit:
399 return retval;
402 static int yurex_release(struct inode *inode, struct file *file)
404 struct usb_yurex *dev;
406 dev = (struct usb_yurex *)file->private_data;
407 if (dev == NULL)
408 return -ENODEV;
410 /* decrement the count on our device */
411 kref_put(&dev->kref, yurex_delete);
412 return 0;
415 static ssize_t yurex_read(struct file *file, char *buffer, size_t count, loff_t *ppos)
417 struct usb_yurex *dev;
418 int retval = 0;
419 int bytes_read = 0;
420 char in_buffer[20];
421 unsigned long flags;
423 dev = (struct usb_yurex *)file->private_data;
425 mutex_lock(&dev->io_mutex);
426 if (!dev->interface) { /* already disconnected */
427 retval = -ENODEV;
428 goto exit;
431 spin_lock_irqsave(&dev->lock, flags);
432 bytes_read = snprintf(in_buffer, 20, "%lld\n", dev->bbu);
433 spin_unlock_irqrestore(&dev->lock, flags);
435 if (*ppos < bytes_read) {
436 if (copy_to_user(buffer, in_buffer + *ppos, bytes_read - *ppos))
437 retval = -EFAULT;
438 else {
439 retval = bytes_read - *ppos;
440 *ppos += bytes_read;
444 exit:
445 mutex_unlock(&dev->io_mutex);
446 return retval;
449 static ssize_t yurex_write(struct file *file, const char *user_buffer, size_t count, loff_t *ppos)
451 struct usb_yurex *dev;
452 int i, set = 0, retval = 0;
453 char buffer[16];
454 char *data = buffer;
455 unsigned long long c, c2 = 0;
456 signed long timeout = 0;
457 DEFINE_WAIT(wait);
459 count = min(sizeof(buffer), count);
460 dev = (struct usb_yurex *)file->private_data;
462 /* verify that we actually have some data to write */
463 if (count == 0)
464 goto error;
466 mutex_lock(&dev->io_mutex);
467 if (!dev->interface) { /* alreaday disconnected */
468 mutex_unlock(&dev->io_mutex);
469 retval = -ENODEV;
470 goto error;
473 if (copy_from_user(buffer, user_buffer, count)) {
474 mutex_unlock(&dev->io_mutex);
475 retval = -EFAULT;
476 goto error;
478 memset(dev->cntl_buffer, CMD_PADDING, YUREX_BUF_SIZE);
480 switch (buffer[0]) {
481 case CMD_ANIMATE:
482 case CMD_LED:
483 dev->cntl_buffer[0] = buffer[0];
484 dev->cntl_buffer[1] = buffer[1];
485 dev->cntl_buffer[2] = CMD_EOF;
486 break;
487 case CMD_READ:
488 case CMD_VERSION:
489 dev->cntl_buffer[0] = buffer[0];
490 dev->cntl_buffer[1] = 0x00;
491 dev->cntl_buffer[2] = CMD_EOF;
492 break;
493 case CMD_SET:
494 data++;
495 /* FALL THROUGH */
496 case '0' ... '9':
497 set = 1;
498 c = c2 = simple_strtoull(data, NULL, 0);
499 dev->cntl_buffer[0] = CMD_SET;
500 for (i = 1; i < 6; i++) {
501 dev->cntl_buffer[i] = (c>>32) & 0xff;
502 c <<= 8;
504 buffer[6] = CMD_EOF;
505 break;
506 default:
507 mutex_unlock(&dev->io_mutex);
508 return -EINVAL;
511 /* send the data as the control msg */
512 prepare_to_wait(&dev->waitq, &wait, TASK_INTERRUPTIBLE);
513 dev_dbg(&dev->interface->dev, "%s - submit %c\n", __func__,
514 dev->cntl_buffer[0]);
515 retval = usb_submit_urb(dev->cntl_urb, GFP_KERNEL);
516 if (retval >= 0)
517 timeout = schedule_timeout(YUREX_WRITE_TIMEOUT);
518 finish_wait(&dev->waitq, &wait);
520 mutex_unlock(&dev->io_mutex);
522 if (retval < 0) {
523 dev_err(&dev->interface->dev,
524 "%s - failed to send bulk msg, error %d\n",
525 __func__, retval);
526 goto error;
528 if (set && timeout)
529 dev->bbu = c2;
530 return timeout ? count : -EIO;
532 error:
533 return retval;
536 static const struct file_operations yurex_fops = {
537 .owner = THIS_MODULE,
538 .read = yurex_read,
539 .write = yurex_write,
540 .open = yurex_open,
541 .release = yurex_release,
542 .fasync = yurex_fasync,
543 .llseek = default_llseek,
546 module_usb_driver(yurex_driver);
548 MODULE_LICENSE("GPL");