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
30 #define CMD_ANIMATE 'A'
35 #define CMD_VERSION 'V'
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
52 #define YUREX_MINOR_BASE 192
55 /* Structure to hold all of our device specific stuff */
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 */
67 struct mutex io_mutex;
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);
100 usb_put_dev(dev->udev);
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);
110 usb_kill_urb(dev->urb);
112 usb_free_coherent(dev->udev, YUREX_BUF_SIZE,
113 dev->int_buffer, dev->urb->transfer_dma);
114 usb_free_urb(dev->urb);
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 = {
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;
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);
148 /* The device is terminated, clean up */
151 dev_err(&dev->interface->dev,
152 "%s - unknown status received: %d\n", __func__, status);
156 /* handle received message */
160 if (buf[6] == CMD_EOF) {
161 spin_lock_irqsave(&dev->lock, flags);
163 for (i = 1; i < 6; i++) {
168 dbg("%s count: %lld", __func__, dev->bbu);
169 spin_unlock_irqrestore(&dev->lock, flags);
171 kill_fasync(&dev->async_queue, SIGIO, POLL_IN);
174 dbg("data format error - no EOF");
177 dbg("%s ack: %c", __func__, buf[1]);
178 wake_up_interruptible(&dev->waitq);
183 retval = usb_submit_urb(dev->urb, GFP_ATOMIC);
185 dev_err(&dev->interface->dev, "%s - usb_submit_urb failed: %d\n",
190 static int yurex_probe(struct usb_interface *interface, const struct usb_device_id *id)
192 struct usb_yurex *dev;
193 struct usb_host_interface *iface_desc;
194 struct usb_endpoint_descriptor *endpoint;
195 int retval = -ENOMEM;
199 /* allocate memory for our device state and initialize it */
200 dev = kzalloc(sizeof(*dev), GFP_KERNEL);
202 dev_err(&interface->dev, "Out of memory\n");
205 kref_init(&dev->kref);
206 mutex_init(&dev->io_mutex);
207 spin_lock_init(&dev->lock);
208 init_waitqueue_head(&dev->waitq);
210 dev->udev = usb_get_dev(interface_to_usbdev(interface));
211 dev->interface = interface;
213 /* set up the endpoint information */
214 iface_desc = interface->cur_altsetting;
215 for (i = 0; i < iface_desc->desc.bNumEndpoints; i++) {
216 endpoint = &iface_desc->endpoint[i].desc;
218 if (usb_endpoint_is_int_in(endpoint)) {
219 dev->int_in_endpointAddr = endpoint->bEndpointAddress;
223 if (!dev->int_in_endpointAddr) {
225 dev_err(&interface->dev, "Could not find endpoints\n");
230 /* allocate control URB */
231 dev->cntl_urb = usb_alloc_urb(0, GFP_KERNEL);
232 if (!dev->cntl_urb) {
233 dev_err(&interface->dev, "Could not allocate control URB\n");
237 /* allocate buffer for control req */
238 dev->cntl_req = kmalloc(YUREX_BUF_SIZE, GFP_KERNEL);
239 if (!dev->cntl_req) {
240 dev_err(&interface->dev, "Could not allocate cntl_req\n");
244 /* allocate buffer for control msg */
245 dev->cntl_buffer = usb_alloc_coherent(dev->udev, YUREX_BUF_SIZE,
247 &dev->cntl_urb->transfer_dma);
248 if (!dev->cntl_buffer) {
249 dev_err(&interface->dev, "Could not allocate cntl_buffer\n");
253 /* configure control URB */
254 dev->cntl_req->bRequestType = USB_DIR_OUT | USB_TYPE_CLASS |
256 dev->cntl_req->bRequest = HID_REQ_SET_REPORT;
257 dev->cntl_req->wValue = cpu_to_le16((HID_OUTPUT_REPORT + 1) << 8);
258 dev->cntl_req->wIndex = cpu_to_le16(iface_desc->desc.bInterfaceNumber);
259 dev->cntl_req->wLength = cpu_to_le16(YUREX_BUF_SIZE);
261 usb_fill_control_urb(dev->cntl_urb, dev->udev,
262 usb_sndctrlpipe(dev->udev, 0),
263 (void *)dev->cntl_req, dev->cntl_buffer,
264 YUREX_BUF_SIZE, yurex_control_callback, dev);
265 dev->cntl_urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
268 /* allocate interrupt URB */
269 dev->urb = usb_alloc_urb(0, GFP_KERNEL);
271 dev_err(&interface->dev, "Could not allocate URB\n");
275 /* allocate buffer for interrupt in */
276 dev->int_buffer = usb_alloc_coherent(dev->udev, YUREX_BUF_SIZE,
277 GFP_KERNEL, &dev->urb->transfer_dma);
278 if (!dev->int_buffer) {
279 dev_err(&interface->dev, "Could not allocate int_buffer\n");
283 /* configure interrupt URB */
284 usb_fill_int_urb(dev->urb, dev->udev,
285 usb_rcvintpipe(dev->udev, dev->int_in_endpointAddr),
286 dev->int_buffer, YUREX_BUF_SIZE, yurex_interrupt,
288 dev->urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
289 if (usb_submit_urb(dev->urb, GFP_KERNEL)) {
291 dev_err(&interface->dev, "Could not submitting URB\n");
295 /* save our data pointer in this interface device */
296 usb_set_intfdata(interface, dev);
298 /* we can register the device now, as it is ready */
299 retval = usb_register_dev(interface, &yurex_class);
301 dev_err(&interface->dev,
302 "Not able to get a minor for this device.\n");
303 usb_set_intfdata(interface, NULL);
309 dev_info(&interface->dev,
310 "USB YUREX device now attached to Yurex #%d\n",
317 /* this frees allocated memory */
318 kref_put(&dev->kref, yurex_delete);
322 static void yurex_disconnect(struct usb_interface *interface)
324 struct usb_yurex *dev;
325 int minor = interface->minor;
327 dev = usb_get_intfdata(interface);
328 usb_set_intfdata(interface, NULL);
330 /* give back our minor */
331 usb_deregister_dev(interface, &yurex_class);
333 /* prevent more I/O from starting */
334 mutex_lock(&dev->io_mutex);
335 dev->interface = NULL;
336 mutex_unlock(&dev->io_mutex);
339 kill_fasync(&dev->async_queue, SIGIO, POLL_IN);
340 wake_up_interruptible(&dev->waitq);
342 /* decrement our usage count */
343 kref_put(&dev->kref, yurex_delete);
345 dev_info(&interface->dev, "USB YUREX #%d now disconnected\n", minor);
348 static struct usb_driver yurex_driver = {
350 .probe = yurex_probe,
351 .disconnect = yurex_disconnect,
352 .id_table = yurex_table,
356 static int yurex_fasync(int fd, struct file *file, int on)
358 struct usb_yurex *dev;
360 dev = (struct usb_yurex *)file->private_data;
361 return fasync_helper(fd, file, on, &dev->async_queue);
364 static int yurex_open(struct inode *inode, struct file *file)
366 struct usb_yurex *dev;
367 struct usb_interface *interface;
371 subminor = iminor(inode);
373 interface = usb_find_interface(&yurex_driver, subminor);
375 printk(KERN_ERR "%s - error, can't find device for minor %d",
381 dev = usb_get_intfdata(interface);
387 /* increment our usage count for the device */
388 kref_get(&dev->kref);
390 /* save our object in the file's private structure */
391 mutex_lock(&dev->io_mutex);
392 file->private_data = dev;
393 mutex_unlock(&dev->io_mutex);
399 static int yurex_release(struct inode *inode, struct file *file)
401 struct usb_yurex *dev;
403 dev = (struct usb_yurex *)file->private_data;
407 yurex_fasync(-1, file, 0);
409 /* decrement the count on our device */
410 kref_put(&dev->kref, yurex_delete);
414 static ssize_t yurex_read(struct file *file, char *buffer, size_t count, loff_t *ppos)
416 struct usb_yurex *dev;
422 dev = (struct usb_yurex *)file->private_data;
424 mutex_lock(&dev->io_mutex);
425 if (!dev->interface) { /* already disconnected */
430 spin_lock_irqsave(&dev->lock, flags);
431 bytes_read = snprintf(in_buffer, 20, "%lld\n", dev->bbu);
432 spin_unlock_irqrestore(&dev->lock, flags);
434 if (*ppos < bytes_read) {
435 if (copy_to_user(buffer, in_buffer + *ppos, bytes_read - *ppos))
438 retval = bytes_read - *ppos;
444 mutex_unlock(&dev->io_mutex);
448 static ssize_t yurex_write(struct file *file, const char *user_buffer, size_t count, loff_t *ppos)
450 struct usb_yurex *dev;
451 int i, set = 0, retval = 0;
454 unsigned long long c, c2 = 0;
455 signed long timeout = 0;
458 count = min(sizeof(buffer), count);
459 dev = (struct usb_yurex *)file->private_data;
461 /* verify that we actually have some data to write */
465 mutex_lock(&dev->io_mutex);
466 if (!dev->interface) { /* alreaday disconnected */
467 mutex_unlock(&dev->io_mutex);
472 if (copy_from_user(buffer, user_buffer, count)) {
473 mutex_unlock(&dev->io_mutex);
477 memset(dev->cntl_buffer, CMD_PADDING, YUREX_BUF_SIZE);
482 dev->cntl_buffer[0] = buffer[0];
483 dev->cntl_buffer[1] = buffer[1];
484 dev->cntl_buffer[2] = CMD_EOF;
488 dev->cntl_buffer[0] = buffer[0];
489 dev->cntl_buffer[1] = 0x00;
490 dev->cntl_buffer[2] = CMD_EOF;
497 c = c2 = simple_strtoull(data, NULL, 0);
498 dev->cntl_buffer[0] = CMD_SET;
499 for (i = 1; i < 6; i++) {
500 dev->cntl_buffer[i] = (c>>32) & 0xff;
506 mutex_unlock(&dev->io_mutex);
510 /* send the data as the control msg */
511 prepare_to_wait(&dev->waitq, &wait, TASK_INTERRUPTIBLE);
512 dbg("%s - submit %c", __func__, dev->cntl_buffer[0]);
513 retval = usb_submit_urb(dev->cntl_urb, GFP_KERNEL);
515 timeout = schedule_timeout(YUREX_WRITE_TIMEOUT);
516 finish_wait(&dev->waitq, &wait);
518 mutex_unlock(&dev->io_mutex);
521 dev_err(&dev->interface->dev,
522 "%s - failed to send bulk msg, error %d\n",
528 return timeout ? count : -EIO;
534 static const struct file_operations yurex_fops = {
535 .owner = THIS_MODULE,
537 .write = yurex_write,
539 .release = yurex_release,
540 .fasync = yurex_fasync,
541 .llseek = default_llseek,
544 module_usb_driver(yurex_driver);
546 MODULE_LICENSE("GPL");