Tomoki Sekiyama | 6bc235a | 2010-09-29 12:16:50 +0900 | [diff] [blame] | 1 | /* |
| 2 | * Driver for Meywa-Denki & KAYAC YUREX |
| 3 | * |
| 4 | * Copyright (C) 2010 Tomoki Sekiyama (tomoki.sekiyama@gmail.com) |
| 5 | * |
| 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. |
| 9 | * |
| 10 | */ |
| 11 | |
| 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> |
| 22 | |
| 23 | #define DRIVER_AUTHOR "Tomoki Sekiyama" |
| 24 | #define DRIVER_DESC "Driver for Meywa-Denki & KAYAC YUREX" |
| 25 | |
| 26 | #define YUREX_VENDOR_ID 0x0c45 |
| 27 | #define YUREX_PRODUCT_ID 0x1010 |
| 28 | |
| 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 |
| 38 | |
| 39 | #define YUREX_BUF_SIZE 8 |
Tomoki Sekiyama | e06ea97 | 2010-10-03 06:59:06 +0900 | [diff] [blame] | 40 | #define YUREX_WRITE_TIMEOUT (HZ*2) |
Tomoki Sekiyama | 6bc235a | 2010-09-29 12:16:50 +0900 | [diff] [blame] | 41 | |
| 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 */ |
| 46 | }; |
| 47 | MODULE_DEVICE_TABLE(usb, yurex_table); |
| 48 | |
| 49 | #ifdef CONFIG_USB_DYNAMIC_MINORS |
Greg Kroah-Hartman | 1b62d25 | 2010-09-30 05:01:22 -0700 | [diff] [blame] | 50 | #define YUREX_MINOR_BASE 0 |
Tomoki Sekiyama | 6bc235a | 2010-09-29 12:16:50 +0900 | [diff] [blame] | 51 | #else |
Greg Kroah-Hartman | 1b62d25 | 2010-09-30 05:01:22 -0700 | [diff] [blame] | 52 | #define YUREX_MINOR_BASE 192 |
Tomoki Sekiyama | 6bc235a | 2010-09-29 12:16:50 +0900 | [diff] [blame] | 53 | #endif |
| 54 | |
| 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 */ |
| 65 | |
| 66 | struct kref kref; |
| 67 | struct mutex io_mutex; |
| 68 | struct fasync_struct *async_queue; |
| 69 | wait_queue_head_t waitq; |
| 70 | |
| 71 | spinlock_t lock; |
| 72 | __s64 bbu; /* BBU from device */ |
| 73 | }; |
| 74 | #define to_yurex_dev(d) container_of(d, struct usb_yurex, kref) |
| 75 | |
| 76 | static struct usb_driver yurex_driver; |
| 77 | static const struct file_operations yurex_fops; |
| 78 | |
| 79 | |
| 80 | static void yurex_control_callback(struct urb *urb) |
| 81 | { |
| 82 | struct usb_yurex *dev = urb->context; |
| 83 | int status = urb->status; |
| 84 | |
| 85 | if (status) { |
Greg Kroah-Hartman | 4571410 | 2012-04-20 16:53:56 -0700 | [diff] [blame] | 86 | dev_err(&urb->dev->dev, "%s - control failed: %d\n", |
| 87 | __func__, status); |
Tomoki Sekiyama | 6bc235a | 2010-09-29 12:16:50 +0900 | [diff] [blame] | 88 | wake_up_interruptible(&dev->waitq); |
| 89 | return; |
| 90 | } |
| 91 | /* on success, sender woken up by CMD_ACK int in, or timeout */ |
| 92 | } |
| 93 | |
| 94 | static void yurex_delete(struct kref *kref) |
| 95 | { |
| 96 | struct usb_yurex *dev = to_yurex_dev(kref); |
| 97 | |
Greg Kroah-Hartman | aadd647 | 2012-05-01 21:34:11 -0700 | [diff] [blame] | 98 | dev_dbg(&dev->interface->dev, "%s\n", __func__); |
Tomoki Sekiyama | 6bc235a | 2010-09-29 12:16:50 +0900 | [diff] [blame] | 99 | |
| 100 | usb_put_dev(dev->udev); |
Tomoki Sekiyama | e06ea97 | 2010-10-03 06:59:06 +0900 | [diff] [blame] | 101 | if (dev->cntl_urb) { |
| 102 | usb_kill_urb(dev->cntl_urb); |
Tomoki Sekiyama | 523fc5c | 2012-03-30 08:51:28 +0900 | [diff] [blame] | 103 | kfree(dev->cntl_req); |
Tomoki Sekiyama | e06ea97 | 2010-10-03 06:59:06 +0900 | [diff] [blame] | 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); |
| 108 | } |
Tomoki Sekiyama | 6bc235a | 2010-09-29 12:16:50 +0900 | [diff] [blame] | 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); |
| 115 | } |
| 116 | kfree(dev); |
| 117 | } |
| 118 | |
| 119 | /* |
| 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 |
| 122 | */ |
| 123 | static struct usb_class_driver yurex_class = { |
| 124 | .name = "yurex%d", |
| 125 | .fops = &yurex_fops, |
| 126 | .minor_base = YUREX_MINOR_BASE, |
| 127 | }; |
| 128 | |
| 129 | static void yurex_interrupt(struct urb *urb) |
| 130 | { |
| 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; |
| 136 | |
| 137 | switch (status) { |
| 138 | case 0: /*success*/ |
| 139 | break; |
| 140 | case -EOVERFLOW: |
Greg Kroah-Hartman | 4571410 | 2012-04-20 16:53:56 -0700 | [diff] [blame] | 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); |
Tomoki Sekiyama | 6bc235a | 2010-09-29 12:16:50 +0900 | [diff] [blame] | 144 | case -ECONNRESET: |
| 145 | case -ENOENT: |
| 146 | case -ESHUTDOWN: |
| 147 | case -EILSEQ: |
| 148 | /* The device is terminated, clean up */ |
| 149 | return; |
| 150 | default: |
Greg Kroah-Hartman | 4571410 | 2012-04-20 16:53:56 -0700 | [diff] [blame] | 151 | dev_err(&dev->interface->dev, |
| 152 | "%s - unknown status received: %d\n", __func__, status); |
Tomoki Sekiyama | 6bc235a | 2010-09-29 12:16:50 +0900 | [diff] [blame] | 153 | goto exit; |
| 154 | } |
| 155 | |
| 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; |
| 167 | } |
Greg Kroah-Hartman | aadd647 | 2012-05-01 21:34:11 -0700 | [diff] [blame] | 168 | dev_dbg(&dev->interface->dev, "%s count: %lld\n", |
| 169 | __func__, dev->bbu); |
Tomoki Sekiyama | 6bc235a | 2010-09-29 12:16:50 +0900 | [diff] [blame] | 170 | spin_unlock_irqrestore(&dev->lock, flags); |
| 171 | |
| 172 | kill_fasync(&dev->async_queue, SIGIO, POLL_IN); |
| 173 | } |
| 174 | else |
Greg Kroah-Hartman | aadd647 | 2012-05-01 21:34:11 -0700 | [diff] [blame] | 175 | dev_dbg(&dev->interface->dev, |
| 176 | "data format error - no EOF\n"); |
Tomoki Sekiyama | 6bc235a | 2010-09-29 12:16:50 +0900 | [diff] [blame] | 177 | break; |
| 178 | case CMD_ACK: |
Greg Kroah-Hartman | aadd647 | 2012-05-01 21:34:11 -0700 | [diff] [blame] | 179 | dev_dbg(&dev->interface->dev, "%s ack: %c\n", |
| 180 | __func__, buf[1]); |
Tomoki Sekiyama | 6bc235a | 2010-09-29 12:16:50 +0900 | [diff] [blame] | 181 | wake_up_interruptible(&dev->waitq); |
| 182 | break; |
| 183 | } |
| 184 | |
| 185 | exit: |
| 186 | retval = usb_submit_urb(dev->urb, GFP_ATOMIC); |
| 187 | if (retval) { |
Greg Kroah-Hartman | 4571410 | 2012-04-20 16:53:56 -0700 | [diff] [blame] | 188 | dev_err(&dev->interface->dev, "%s - usb_submit_urb failed: %d\n", |
Tomoki Sekiyama | 6bc235a | 2010-09-29 12:16:50 +0900 | [diff] [blame] | 189 | __func__, retval); |
| 190 | } |
| 191 | } |
| 192 | |
| 193 | static int yurex_probe(struct usb_interface *interface, const struct usb_device_id *id) |
| 194 | { |
| 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); |
| 201 | |
| 202 | /* allocate memory for our device state and initialize it */ |
| 203 | dev = kzalloc(sizeof(*dev), GFP_KERNEL); |
| 204 | if (!dev) { |
Greg Kroah-Hartman | 4571410 | 2012-04-20 16:53:56 -0700 | [diff] [blame] | 205 | dev_err(&interface->dev, "Out of memory\n"); |
Tomoki Sekiyama | 6bc235a | 2010-09-29 12:16:50 +0900 | [diff] [blame] | 206 | goto error; |
| 207 | } |
| 208 | kref_init(&dev->kref); |
| 209 | mutex_init(&dev->io_mutex); |
| 210 | spin_lock_init(&dev->lock); |
| 211 | init_waitqueue_head(&dev->waitq); |
| 212 | |
| 213 | dev->udev = usb_get_dev(interface_to_usbdev(interface)); |
| 214 | dev->interface = interface; |
| 215 | |
| 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; |
| 220 | |
| 221 | if (usb_endpoint_is_int_in(endpoint)) { |
| 222 | dev->int_in_endpointAddr = endpoint->bEndpointAddress; |
| 223 | break; |
| 224 | } |
| 225 | } |
| 226 | if (!dev->int_in_endpointAddr) { |
| 227 | retval = -ENODEV; |
Greg Kroah-Hartman | 4571410 | 2012-04-20 16:53:56 -0700 | [diff] [blame] | 228 | dev_err(&interface->dev, "Could not find endpoints\n"); |
Tomoki Sekiyama | 6bc235a | 2010-09-29 12:16:50 +0900 | [diff] [blame] | 229 | goto error; |
| 230 | } |
| 231 | |
| 232 | |
| 233 | /* allocate control URB */ |
| 234 | dev->cntl_urb = usb_alloc_urb(0, GFP_KERNEL); |
| 235 | if (!dev->cntl_urb) { |
Greg Kroah-Hartman | 4571410 | 2012-04-20 16:53:56 -0700 | [diff] [blame] | 236 | dev_err(&interface->dev, "Could not allocate control URB\n"); |
Tomoki Sekiyama | 6bc235a | 2010-09-29 12:16:50 +0900 | [diff] [blame] | 237 | goto error; |
| 238 | } |
| 239 | |
| 240 | /* allocate buffer for control req */ |
Tomoki Sekiyama | 523fc5c | 2012-03-30 08:51:28 +0900 | [diff] [blame] | 241 | dev->cntl_req = kmalloc(YUREX_BUF_SIZE, GFP_KERNEL); |
Tomoki Sekiyama | 6bc235a | 2010-09-29 12:16:50 +0900 | [diff] [blame] | 242 | if (!dev->cntl_req) { |
Greg Kroah-Hartman | 4571410 | 2012-04-20 16:53:56 -0700 | [diff] [blame] | 243 | dev_err(&interface->dev, "Could not allocate cntl_req\n"); |
Tomoki Sekiyama | 6bc235a | 2010-09-29 12:16:50 +0900 | [diff] [blame] | 244 | goto error; |
| 245 | } |
| 246 | |
| 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) { |
Greg Kroah-Hartman | 4571410 | 2012-04-20 16:53:56 -0700 | [diff] [blame] | 252 | dev_err(&interface->dev, "Could not allocate cntl_buffer\n"); |
Tomoki Sekiyama | 6bc235a | 2010-09-29 12:16:50 +0900 | [diff] [blame] | 253 | goto error; |
| 254 | } |
| 255 | |
| 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); |
| 263 | |
| 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); |
Tomoki Sekiyama | e06ea97 | 2010-10-03 06:59:06 +0900 | [diff] [blame] | 268 | dev->cntl_urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP; |
Tomoki Sekiyama | 6bc235a | 2010-09-29 12:16:50 +0900 | [diff] [blame] | 269 | |
| 270 | |
| 271 | /* allocate interrupt URB */ |
| 272 | dev->urb = usb_alloc_urb(0, GFP_KERNEL); |
| 273 | if (!dev->urb) { |
Greg Kroah-Hartman | 4571410 | 2012-04-20 16:53:56 -0700 | [diff] [blame] | 274 | dev_err(&interface->dev, "Could not allocate URB\n"); |
Tomoki Sekiyama | 6bc235a | 2010-09-29 12:16:50 +0900 | [diff] [blame] | 275 | goto error; |
| 276 | } |
| 277 | |
| 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) { |
Greg Kroah-Hartman | 4571410 | 2012-04-20 16:53:56 -0700 | [diff] [blame] | 282 | dev_err(&interface->dev, "Could not allocate int_buffer\n"); |
Tomoki Sekiyama | 6bc235a | 2010-09-29 12:16:50 +0900 | [diff] [blame] | 283 | goto error; |
| 284 | } |
| 285 | |
| 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); |
Tomoki Sekiyama | 532f17b | 2012-03-30 08:51:36 +0900 | [diff] [blame] | 291 | dev->urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP; |
Tomoki Sekiyama | 6bc235a | 2010-09-29 12:16:50 +0900 | [diff] [blame] | 292 | if (usb_submit_urb(dev->urb, GFP_KERNEL)) { |
| 293 | retval = -EIO; |
Greg Kroah-Hartman | 4571410 | 2012-04-20 16:53:56 -0700 | [diff] [blame] | 294 | dev_err(&interface->dev, "Could not submitting URB\n"); |
Tomoki Sekiyama | 6bc235a | 2010-09-29 12:16:50 +0900 | [diff] [blame] | 295 | goto error; |
| 296 | } |
| 297 | |
| 298 | /* save our data pointer in this interface device */ |
| 299 | usb_set_intfdata(interface, dev); |
| 300 | |
| 301 | /* we can register the device now, as it is ready */ |
| 302 | retval = usb_register_dev(interface, &yurex_class); |
| 303 | if (retval) { |
Greg Kroah-Hartman | 4571410 | 2012-04-20 16:53:56 -0700 | [diff] [blame] | 304 | dev_err(&interface->dev, |
| 305 | "Not able to get a minor for this device.\n"); |
Tomoki Sekiyama | 6bc235a | 2010-09-29 12:16:50 +0900 | [diff] [blame] | 306 | usb_set_intfdata(interface, NULL); |
| 307 | goto error; |
| 308 | } |
| 309 | |
| 310 | dev->bbu = -1; |
| 311 | |
| 312 | dev_info(&interface->dev, |
Tomoki Sekiyama | e06ea97 | 2010-10-03 06:59:06 +0900 | [diff] [blame] | 313 | "USB YUREX device now attached to Yurex #%d\n", |
Tomoki Sekiyama | 6bc235a | 2010-09-29 12:16:50 +0900 | [diff] [blame] | 314 | interface->minor); |
| 315 | |
| 316 | return 0; |
| 317 | |
| 318 | error: |
| 319 | if (dev) |
| 320 | /* this frees allocated memory */ |
| 321 | kref_put(&dev->kref, yurex_delete); |
| 322 | return retval; |
| 323 | } |
| 324 | |
| 325 | static void yurex_disconnect(struct usb_interface *interface) |
| 326 | { |
| 327 | struct usb_yurex *dev; |
| 328 | int minor = interface->minor; |
| 329 | |
| 330 | dev = usb_get_intfdata(interface); |
| 331 | usb_set_intfdata(interface, NULL); |
| 332 | |
| 333 | /* give back our minor */ |
| 334 | usb_deregister_dev(interface, &yurex_class); |
| 335 | |
| 336 | /* prevent more I/O from starting */ |
| 337 | mutex_lock(&dev->io_mutex); |
| 338 | dev->interface = NULL; |
| 339 | mutex_unlock(&dev->io_mutex); |
| 340 | |
| 341 | /* wakeup waiters */ |
| 342 | kill_fasync(&dev->async_queue, SIGIO, POLL_IN); |
| 343 | wake_up_interruptible(&dev->waitq); |
| 344 | |
| 345 | /* decrement our usage count */ |
| 346 | kref_put(&dev->kref, yurex_delete); |
| 347 | |
Tomoki Sekiyama | e06ea97 | 2010-10-03 06:59:06 +0900 | [diff] [blame] | 348 | dev_info(&interface->dev, "USB YUREX #%d now disconnected\n", minor); |
Tomoki Sekiyama | 6bc235a | 2010-09-29 12:16:50 +0900 | [diff] [blame] | 349 | } |
| 350 | |
| 351 | static struct usb_driver yurex_driver = { |
| 352 | .name = "yurex", |
| 353 | .probe = yurex_probe, |
| 354 | .disconnect = yurex_disconnect, |
| 355 | .id_table = yurex_table, |
| 356 | }; |
| 357 | |
| 358 | |
| 359 | static int yurex_fasync(int fd, struct file *file, int on) |
| 360 | { |
| 361 | struct usb_yurex *dev; |
| 362 | |
| 363 | dev = (struct usb_yurex *)file->private_data; |
| 364 | return fasync_helper(fd, file, on, &dev->async_queue); |
| 365 | } |
| 366 | |
| 367 | static int yurex_open(struct inode *inode, struct file *file) |
| 368 | { |
| 369 | struct usb_yurex *dev; |
| 370 | struct usb_interface *interface; |
| 371 | int subminor; |
| 372 | int retval = 0; |
| 373 | |
| 374 | subminor = iminor(inode); |
| 375 | |
| 376 | interface = usb_find_interface(&yurex_driver, subminor); |
| 377 | if (!interface) { |
Greg Kroah-Hartman | 4571410 | 2012-04-20 16:53:56 -0700 | [diff] [blame] | 378 | printk(KERN_ERR "%s - error, can't find device for minor %d", |
| 379 | __func__, subminor); |
Tomoki Sekiyama | 6bc235a | 2010-09-29 12:16:50 +0900 | [diff] [blame] | 380 | retval = -ENODEV; |
| 381 | goto exit; |
| 382 | } |
| 383 | |
| 384 | dev = usb_get_intfdata(interface); |
| 385 | if (!dev) { |
| 386 | retval = -ENODEV; |
| 387 | goto exit; |
| 388 | } |
| 389 | |
| 390 | /* increment our usage count for the device */ |
| 391 | kref_get(&dev->kref); |
| 392 | |
| 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); |
| 397 | |
| 398 | exit: |
| 399 | return retval; |
| 400 | } |
| 401 | |
| 402 | static int yurex_release(struct inode *inode, struct file *file) |
| 403 | { |
| 404 | struct usb_yurex *dev; |
| 405 | |
| 406 | dev = (struct usb_yurex *)file->private_data; |
| 407 | if (dev == NULL) |
| 408 | return -ENODEV; |
| 409 | |
| 410 | yurex_fasync(-1, file, 0); |
| 411 | |
| 412 | /* decrement the count on our device */ |
| 413 | kref_put(&dev->kref, yurex_delete); |
| 414 | return 0; |
| 415 | } |
| 416 | |
| 417 | static ssize_t yurex_read(struct file *file, char *buffer, size_t count, loff_t *ppos) |
| 418 | { |
| 419 | struct usb_yurex *dev; |
| 420 | int retval = 0; |
| 421 | int bytes_read = 0; |
| 422 | char in_buffer[20]; |
| 423 | unsigned long flags; |
| 424 | |
| 425 | dev = (struct usb_yurex *)file->private_data; |
| 426 | |
| 427 | mutex_lock(&dev->io_mutex); |
| 428 | if (!dev->interface) { /* already disconnected */ |
| 429 | retval = -ENODEV; |
| 430 | goto exit; |
| 431 | } |
| 432 | |
| 433 | spin_lock_irqsave(&dev->lock, flags); |
Tomoki Sekiyama | e06ea97 | 2010-10-03 06:59:06 +0900 | [diff] [blame] | 434 | bytes_read = snprintf(in_buffer, 20, "%lld\n", dev->bbu); |
Tomoki Sekiyama | 6bc235a | 2010-09-29 12:16:50 +0900 | [diff] [blame] | 435 | spin_unlock_irqrestore(&dev->lock, flags); |
| 436 | |
| 437 | if (*ppos < bytes_read) { |
| 438 | if (copy_to_user(buffer, in_buffer + *ppos, bytes_read - *ppos)) |
| 439 | retval = -EFAULT; |
| 440 | else { |
| 441 | retval = bytes_read - *ppos; |
| 442 | *ppos += bytes_read; |
| 443 | } |
| 444 | } |
| 445 | |
| 446 | exit: |
| 447 | mutex_unlock(&dev->io_mutex); |
| 448 | return retval; |
| 449 | } |
| 450 | |
| 451 | static ssize_t yurex_write(struct file *file, const char *user_buffer, size_t count, loff_t *ppos) |
| 452 | { |
| 453 | struct usb_yurex *dev; |
| 454 | int i, set = 0, retval = 0; |
| 455 | char buffer[16]; |
| 456 | char *data = buffer; |
| 457 | unsigned long long c, c2 = 0; |
| 458 | signed long timeout = 0; |
| 459 | DEFINE_WAIT(wait); |
| 460 | |
| 461 | count = min(sizeof(buffer), count); |
| 462 | dev = (struct usb_yurex *)file->private_data; |
| 463 | |
| 464 | /* verify that we actually have some data to write */ |
| 465 | if (count == 0) |
| 466 | goto error; |
| 467 | |
| 468 | mutex_lock(&dev->io_mutex); |
| 469 | if (!dev->interface) { /* alreaday disconnected */ |
| 470 | mutex_unlock(&dev->io_mutex); |
| 471 | retval = -ENODEV; |
| 472 | goto error; |
| 473 | } |
| 474 | |
| 475 | if (copy_from_user(buffer, user_buffer, count)) { |
| 476 | mutex_unlock(&dev->io_mutex); |
| 477 | retval = -EFAULT; |
| 478 | goto error; |
| 479 | } |
| 480 | memset(dev->cntl_buffer, CMD_PADDING, YUREX_BUF_SIZE); |
| 481 | |
| 482 | switch (buffer[0]) { |
| 483 | case CMD_ANIMATE: |
| 484 | case CMD_LED: |
| 485 | dev->cntl_buffer[0] = buffer[0]; |
| 486 | dev->cntl_buffer[1] = buffer[1]; |
| 487 | dev->cntl_buffer[2] = CMD_EOF; |
| 488 | break; |
| 489 | case CMD_READ: |
| 490 | case CMD_VERSION: |
| 491 | dev->cntl_buffer[0] = buffer[0]; |
| 492 | dev->cntl_buffer[1] = 0x00; |
| 493 | dev->cntl_buffer[2] = CMD_EOF; |
| 494 | break; |
| 495 | case CMD_SET: |
| 496 | data++; |
| 497 | /* FALL THROUGH */ |
| 498 | case '0' ... '9': |
| 499 | set = 1; |
| 500 | c = c2 = simple_strtoull(data, NULL, 0); |
| 501 | dev->cntl_buffer[0] = CMD_SET; |
| 502 | for (i = 1; i < 6; i++) { |
| 503 | dev->cntl_buffer[i] = (c>>32) & 0xff; |
| 504 | c <<= 8; |
| 505 | } |
| 506 | buffer[6] = CMD_EOF; |
| 507 | break; |
| 508 | default: |
| 509 | mutex_unlock(&dev->io_mutex); |
| 510 | return -EINVAL; |
| 511 | } |
| 512 | |
| 513 | /* send the data as the control msg */ |
| 514 | prepare_to_wait(&dev->waitq, &wait, TASK_INTERRUPTIBLE); |
Greg Kroah-Hartman | aadd647 | 2012-05-01 21:34:11 -0700 | [diff] [blame] | 515 | dev_dbg(&dev->interface->dev, "%s - submit %c\n", __func__, |
| 516 | dev->cntl_buffer[0]); |
Tomoki Sekiyama | 6bc235a | 2010-09-29 12:16:50 +0900 | [diff] [blame] | 517 | retval = usb_submit_urb(dev->cntl_urb, GFP_KERNEL); |
| 518 | if (retval >= 0) |
| 519 | timeout = schedule_timeout(YUREX_WRITE_TIMEOUT); |
| 520 | finish_wait(&dev->waitq, &wait); |
| 521 | |
| 522 | mutex_unlock(&dev->io_mutex); |
| 523 | |
| 524 | if (retval < 0) { |
Greg Kroah-Hartman | 4571410 | 2012-04-20 16:53:56 -0700 | [diff] [blame] | 525 | dev_err(&dev->interface->dev, |
| 526 | "%s - failed to send bulk msg, error %d\n", |
| 527 | __func__, retval); |
Tomoki Sekiyama | 6bc235a | 2010-09-29 12:16:50 +0900 | [diff] [blame] | 528 | goto error; |
| 529 | } |
| 530 | if (set && timeout) |
| 531 | dev->bbu = c2; |
| 532 | return timeout ? count : -EIO; |
| 533 | |
| 534 | error: |
| 535 | return retval; |
| 536 | } |
| 537 | |
| 538 | static const struct file_operations yurex_fops = { |
| 539 | .owner = THIS_MODULE, |
| 540 | .read = yurex_read, |
| 541 | .write = yurex_write, |
| 542 | .open = yurex_open, |
| 543 | .release = yurex_release, |
| 544 | .fasync = yurex_fasync, |
Tomoki Sekiyama | 27f485b | 2010-11-22 19:29:23 +0900 | [diff] [blame] | 545 | .llseek = default_llseek, |
Tomoki Sekiyama | 6bc235a | 2010-09-29 12:16:50 +0900 | [diff] [blame] | 546 | }; |
| 547 | |
Greg Kroah-Hartman | 65db430 | 2011-11-18 09:34:02 -0800 | [diff] [blame] | 548 | module_usb_driver(yurex_driver); |
Tomoki Sekiyama | 6bc235a | 2010-09-29 12:16:50 +0900 | [diff] [blame] | 549 | |
| 550 | MODULE_LICENSE("GPL"); |