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/slab.h>
15 #include <linux/module.h>
16 #include <linux/kref.h>
17 #include <linux/mutex.h>
18 #include <linux/uaccess.h>
19 #include <linux/usb.h>
20 #include <linux/hid.h>
22 #define DRIVER_AUTHOR "Tomoki Sekiyama"
23 #define DRIVER_DESC "Driver for Meywa-Denki & KAYAC YUREX"
25 #define YUREX_VENDOR_ID 0x0c45
26 #define YUREX_PRODUCT_ID 0x1010
29 #define CMD_ANIMATE 'A'
34 #define CMD_VERSION 'V'
36 #define CMD_PADDING 0xff
38 #define YUREX_BUF_SIZE 8
39 #define YUREX_WRITE_TIMEOUT (HZ*2)
41 /* table of devices that work with this driver */
42 static struct usb_device_id yurex_table[] = {
43 { USB_DEVICE(YUREX_VENDOR_ID, YUREX_PRODUCT_ID) },
44 { } /* Terminating entry */
46 MODULE_DEVICE_TABLE(usb, yurex_table);
48 #ifdef CONFIG_USB_DYNAMIC_MINORS
49 #define YUREX_MINOR_BASE 0
51 #define YUREX_MINOR_BASE 192
54 /* Structure to hold all of our device specific stuff */
56 struct usb_device *udev;
57 struct usb_interface *interface;
58 __u8 int_in_endpointAddr;
59 struct urb *urb; /* URB for interrupt in */
60 unsigned char *int_buffer; /* buffer for intterupt in */
61 struct urb *cntl_urb; /* URB for control msg */
62 struct usb_ctrlrequest *cntl_req; /* req for control msg */
63 unsigned char *cntl_buffer; /* buffer for control msg */
66 struct mutex io_mutex;
67 unsigned long disconnected:1;
68 struct fasync_struct *async_queue;
69 wait_queue_head_t waitq;
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;
86 dev_err(&urb->dev->dev, "%s - control failed: %d\n",
88 wake_up_interruptible(&dev->waitq);
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__);
101 usb_kill_urb(dev->cntl_urb);
102 kfree(dev->cntl_req);
103 if (dev->cntl_buffer)
104 usb_free_coherent(dev->udev, YUREX_BUF_SIZE,
105 dev->cntl_buffer, dev->cntl_urb->transfer_dma);
106 usb_free_urb(dev->cntl_urb);
109 usb_kill_urb(dev->urb);
111 usb_free_coherent(dev->udev, YUREX_BUF_SIZE,
112 dev->int_buffer, dev->urb->transfer_dma);
113 usb_free_urb(dev->urb);
115 usb_put_intf(dev->interface);
116 usb_put_dev(dev->udev);
121 * usb class driver info in order to get a minor number from the usb core,
122 * and to have the device registered with the driver core
124 static struct usb_class_driver yurex_class = {
127 .minor_base = YUREX_MINOR_BASE,
130 static void yurex_interrupt(struct urb *urb)
132 struct usb_yurex *dev = urb->context;
133 unsigned char *buf = dev->int_buffer;
134 int status = urb->status;
141 /* The device is terminated or messed up, give up */
143 dev_err(&dev->interface->dev,
144 "%s - overflow with length %d, actual length is %d\n",
145 __func__, YUREX_BUF_SIZE, dev->urb->actual_length);
154 dev_err(&dev->interface->dev,
155 "%s - unknown status received: %d\n", __func__, status);
159 /* handle received message */
163 if (buf[6] == CMD_EOF) {
164 spin_lock_irqsave(&dev->lock, flags);
166 for (i = 1; i < 6; i++) {
171 dev_dbg(&dev->interface->dev, "%s count: %lld\n",
173 spin_unlock_irqrestore(&dev->lock, flags);
175 kill_fasync(&dev->async_queue, SIGIO, POLL_IN);
178 dev_dbg(&dev->interface->dev,
179 "data format error - no EOF\n");
182 dev_dbg(&dev->interface->dev, "%s ack: %c\n",
184 wake_up_interruptible(&dev->waitq);
188 retval = usb_submit_urb(dev->urb, GFP_ATOMIC);
190 dev_err(&dev->interface->dev, "%s - usb_submit_urb failed: %d\n",
195 static int yurex_probe(struct usb_interface *interface, const struct usb_device_id *id)
197 struct usb_yurex *dev;
198 struct usb_host_interface *iface_desc;
199 struct usb_endpoint_descriptor *endpoint;
200 int retval = -ENOMEM;
204 /* allocate memory for our device state and initialize it */
205 dev = kzalloc(sizeof(*dev), GFP_KERNEL);
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 = usb_get_intf(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;
226 if (!dev->int_in_endpointAddr) {
228 dev_err(&interface->dev, "Could not find endpoints\n");
233 /* allocate control URB */
234 dev->cntl_urb = usb_alloc_urb(0, GFP_KERNEL);
238 /* allocate buffer for control req */
239 dev->cntl_req = kmalloc(YUREX_BUF_SIZE, GFP_KERNEL);
243 /* allocate buffer for control msg */
244 dev->cntl_buffer = usb_alloc_coherent(dev->udev, YUREX_BUF_SIZE,
246 &dev->cntl_urb->transfer_dma);
247 if (!dev->cntl_buffer) {
248 dev_err(&interface->dev, "Could not allocate cntl_buffer\n");
252 /* configure control URB */
253 dev->cntl_req->bRequestType = USB_DIR_OUT | USB_TYPE_CLASS |
255 dev->cntl_req->bRequest = HID_REQ_SET_REPORT;
256 dev->cntl_req->wValue = cpu_to_le16((HID_OUTPUT_REPORT + 1) << 8);
257 dev->cntl_req->wIndex = cpu_to_le16(iface_desc->desc.bInterfaceNumber);
258 dev->cntl_req->wLength = cpu_to_le16(YUREX_BUF_SIZE);
260 usb_fill_control_urb(dev->cntl_urb, dev->udev,
261 usb_sndctrlpipe(dev->udev, 0),
262 (void *)dev->cntl_req, dev->cntl_buffer,
263 YUREX_BUF_SIZE, yurex_control_callback, dev);
264 dev->cntl_urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
267 /* allocate interrupt URB */
268 dev->urb = usb_alloc_urb(0, GFP_KERNEL);
272 /* allocate buffer for interrupt in */
273 dev->int_buffer = usb_alloc_coherent(dev->udev, YUREX_BUF_SIZE,
274 GFP_KERNEL, &dev->urb->transfer_dma);
275 if (!dev->int_buffer) {
276 dev_err(&interface->dev, "Could not allocate int_buffer\n");
280 /* configure interrupt URB */
281 usb_fill_int_urb(dev->urb, dev->udev,
282 usb_rcvintpipe(dev->udev, dev->int_in_endpointAddr),
283 dev->int_buffer, YUREX_BUF_SIZE, yurex_interrupt,
285 dev->urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
286 if (usb_submit_urb(dev->urb, GFP_KERNEL)) {
288 dev_err(&interface->dev, "Could not submitting URB\n");
292 /* save our data pointer in this interface device */
293 usb_set_intfdata(interface, dev);
296 /* we can register the device now, as it is ready */
297 retval = usb_register_dev(interface, &yurex_class);
299 dev_err(&interface->dev,
300 "Not able to get a minor for this device.\n");
301 usb_set_intfdata(interface, NULL);
305 dev_info(&interface->dev,
306 "USB YUREX device now attached to Yurex #%d\n",
313 /* this frees allocated memory */
314 kref_put(&dev->kref, yurex_delete);
318 static void yurex_disconnect(struct usb_interface *interface)
320 struct usb_yurex *dev;
321 int minor = interface->minor;
323 dev = usb_get_intfdata(interface);
324 usb_set_intfdata(interface, NULL);
326 /* give back our minor */
327 usb_deregister_dev(interface, &yurex_class);
329 /* prevent more I/O from starting */
330 usb_poison_urb(dev->urb);
331 usb_poison_urb(dev->cntl_urb);
332 mutex_lock(&dev->io_mutex);
333 dev->disconnected = 1;
334 mutex_unlock(&dev->io_mutex);
337 kill_fasync(&dev->async_queue, SIGIO, POLL_IN);
338 wake_up_interruptible(&dev->waitq);
340 /* decrement our usage count */
341 kref_put(&dev->kref, yurex_delete);
343 dev_info(&interface->dev, "USB YUREX #%d now disconnected\n", minor);
346 static struct usb_driver yurex_driver = {
348 .probe = yurex_probe,
349 .disconnect = yurex_disconnect,
350 .id_table = yurex_table,
354 static int yurex_fasync(int fd, struct file *file, int on)
356 struct usb_yurex *dev;
358 dev = file->private_data;
359 return fasync_helper(fd, file, on, &dev->async_queue);
362 static int yurex_open(struct inode *inode, struct file *file)
364 struct usb_yurex *dev;
365 struct usb_interface *interface;
369 subminor = iminor(inode);
371 interface = usb_find_interface(&yurex_driver, subminor);
373 printk(KERN_ERR "%s - error, can't find device for minor %d",
379 dev = usb_get_intfdata(interface);
385 /* increment our usage count for the device */
386 kref_get(&dev->kref);
388 /* save our object in the file's private structure */
389 mutex_lock(&dev->io_mutex);
390 file->private_data = dev;
391 mutex_unlock(&dev->io_mutex);
397 static int yurex_release(struct inode *inode, struct file *file)
399 struct usb_yurex *dev;
401 dev = file->private_data;
405 /* decrement the count on our device */
406 kref_put(&dev->kref, yurex_delete);
410 static ssize_t yurex_read(struct file *file, char __user *buffer, size_t count,
413 struct usb_yurex *dev;
418 dev = file->private_data;
420 mutex_lock(&dev->io_mutex);
421 if (dev->disconnected) { /* already disconnected */
422 mutex_unlock(&dev->io_mutex);
426 spin_lock_irqsave(&dev->lock, flags);
427 len = snprintf(in_buffer, 20, "%lld\n", dev->bbu);
428 spin_unlock_irqrestore(&dev->lock, flags);
429 mutex_unlock(&dev->io_mutex);
431 if (WARN_ON_ONCE(len >= sizeof(in_buffer)))
434 return simple_read_from_buffer(buffer, count, ppos, in_buffer, len);
437 static ssize_t yurex_write(struct file *file, const char __user *user_buffer,
438 size_t count, loff_t *ppos)
440 struct usb_yurex *dev;
441 int i, set = 0, retval = 0;
444 unsigned long long c, c2 = 0;
445 signed long timeout = 0;
448 count = min(sizeof(buffer) - 1, count);
449 dev = file->private_data;
451 /* verify that we actually have some data to write */
455 mutex_lock(&dev->io_mutex);
456 if (dev->disconnected) { /* already disconnected */
457 mutex_unlock(&dev->io_mutex);
462 if (copy_from_user(buffer, user_buffer, count)) {
463 mutex_unlock(&dev->io_mutex);
468 memset(dev->cntl_buffer, CMD_PADDING, YUREX_BUF_SIZE);
473 dev->cntl_buffer[0] = buffer[0];
474 dev->cntl_buffer[1] = buffer[1];
475 dev->cntl_buffer[2] = CMD_EOF;
479 dev->cntl_buffer[0] = buffer[0];
480 dev->cntl_buffer[1] = 0x00;
481 dev->cntl_buffer[2] = CMD_EOF;
488 c = c2 = simple_strtoull(data, NULL, 0);
489 dev->cntl_buffer[0] = CMD_SET;
490 for (i = 1; i < 6; i++) {
491 dev->cntl_buffer[i] = (c>>32) & 0xff;
497 mutex_unlock(&dev->io_mutex);
501 /* send the data as the control msg */
502 prepare_to_wait(&dev->waitq, &wait, TASK_INTERRUPTIBLE);
503 dev_dbg(&dev->interface->dev, "%s - submit %c\n", __func__,
504 dev->cntl_buffer[0]);
505 retval = usb_submit_urb(dev->cntl_urb, GFP_ATOMIC);
507 timeout = schedule_timeout(YUREX_WRITE_TIMEOUT);
508 finish_wait(&dev->waitq, &wait);
510 /* make sure URB is idle after timeout or (spurious) CMD_ACK */
511 usb_kill_urb(dev->cntl_urb);
513 mutex_unlock(&dev->io_mutex);
516 dev_err(&dev->interface->dev,
517 "%s - failed to send bulk msg, error %d\n",
523 return timeout ? count : -EIO;
529 static const struct file_operations yurex_fops = {
530 .owner = THIS_MODULE,
532 .write = yurex_write,
534 .release = yurex_release,
535 .fasync = yurex_fasync,
536 .llseek = default_llseek,
539 module_usb_driver(yurex_driver);
541 MODULE_LICENSE("GPL");