Greg Kroah-Hartman | 5fd54ac | 2017-11-03 11:28:30 +0100 | [diff] [blame] | 1 | // SPDX-License-Identifier: GPL-2.0 |
Tomoki Sekiyama | 6bc235a | 2010-09-29 12:16:50 +0900 | [diff] [blame] | 2 | /* |
| 3 | * Driver for Meywa-Denki & KAYAC YUREX |
| 4 | * |
| 5 | * Copyright (C) 2010 Tomoki Sekiyama (tomoki.sekiyama@gmail.com) |
Tomoki Sekiyama | 6bc235a | 2010-09-29 12:16:50 +0900 | [diff] [blame] | 6 | */ |
| 7 | |
| 8 | #include <linux/kernel.h> |
| 9 | #include <linux/errno.h> |
Tomoki Sekiyama | 6bc235a | 2010-09-29 12:16:50 +0900 | [diff] [blame] | 10 | #include <linux/slab.h> |
| 11 | #include <linux/module.h> |
| 12 | #include <linux/kref.h> |
| 13 | #include <linux/mutex.h> |
| 14 | #include <linux/uaccess.h> |
| 15 | #include <linux/usb.h> |
| 16 | #include <linux/hid.h> |
| 17 | |
| 18 | #define DRIVER_AUTHOR "Tomoki Sekiyama" |
| 19 | #define DRIVER_DESC "Driver for Meywa-Denki & KAYAC YUREX" |
| 20 | |
| 21 | #define YUREX_VENDOR_ID 0x0c45 |
| 22 | #define YUREX_PRODUCT_ID 0x1010 |
| 23 | |
| 24 | #define CMD_ACK '!' |
| 25 | #define CMD_ANIMATE 'A' |
| 26 | #define CMD_COUNT 'C' |
| 27 | #define CMD_LED 'L' |
| 28 | #define CMD_READ 'R' |
| 29 | #define CMD_SET 'S' |
| 30 | #define CMD_VERSION 'V' |
| 31 | #define CMD_EOF 0x0d |
| 32 | #define CMD_PADDING 0xff |
| 33 | |
| 34 | #define YUREX_BUF_SIZE 8 |
Tomoki Sekiyama | e06ea97 | 2010-10-03 06:59:06 +0900 | [diff] [blame] | 35 | #define YUREX_WRITE_TIMEOUT (HZ*2) |
Tomoki Sekiyama | 6bc235a | 2010-09-29 12:16:50 +0900 | [diff] [blame] | 36 | |
| 37 | /* table of devices that work with this driver */ |
| 38 | static struct usb_device_id yurex_table[] = { |
| 39 | { USB_DEVICE(YUREX_VENDOR_ID, YUREX_PRODUCT_ID) }, |
| 40 | { } /* Terminating entry */ |
| 41 | }; |
| 42 | MODULE_DEVICE_TABLE(usb, yurex_table); |
| 43 | |
| 44 | #ifdef CONFIG_USB_DYNAMIC_MINORS |
Greg Kroah-Hartman | 1b62d25 | 2010-09-30 05:01:22 -0700 | [diff] [blame] | 45 | #define YUREX_MINOR_BASE 0 |
Tomoki Sekiyama | 6bc235a | 2010-09-29 12:16:50 +0900 | [diff] [blame] | 46 | #else |
Greg Kroah-Hartman | 1b62d25 | 2010-09-30 05:01:22 -0700 | [diff] [blame] | 47 | #define YUREX_MINOR_BASE 192 |
Tomoki Sekiyama | 6bc235a | 2010-09-29 12:16:50 +0900 | [diff] [blame] | 48 | #endif |
| 49 | |
| 50 | /* Structure to hold all of our device specific stuff */ |
| 51 | struct usb_yurex { |
| 52 | struct usb_device *udev; |
| 53 | struct usb_interface *interface; |
| 54 | __u8 int_in_endpointAddr; |
| 55 | struct urb *urb; /* URB for interrupt in */ |
| 56 | unsigned char *int_buffer; /* buffer for intterupt in */ |
| 57 | struct urb *cntl_urb; /* URB for control msg */ |
| 58 | struct usb_ctrlrequest *cntl_req; /* req for control msg */ |
| 59 | unsigned char *cntl_buffer; /* buffer for control msg */ |
| 60 | |
| 61 | struct kref kref; |
| 62 | struct mutex io_mutex; |
| 63 | struct fasync_struct *async_queue; |
| 64 | wait_queue_head_t waitq; |
| 65 | |
| 66 | spinlock_t lock; |
| 67 | __s64 bbu; /* BBU from device */ |
| 68 | }; |
| 69 | #define to_yurex_dev(d) container_of(d, struct usb_yurex, kref) |
| 70 | |
| 71 | static struct usb_driver yurex_driver; |
| 72 | static const struct file_operations yurex_fops; |
| 73 | |
| 74 | |
| 75 | static void yurex_control_callback(struct urb *urb) |
| 76 | { |
| 77 | struct usb_yurex *dev = urb->context; |
| 78 | int status = urb->status; |
| 79 | |
| 80 | if (status) { |
Greg Kroah-Hartman | 4571410 | 2012-04-20 16:53:56 -0700 | [diff] [blame] | 81 | dev_err(&urb->dev->dev, "%s - control failed: %d\n", |
| 82 | __func__, status); |
Tomoki Sekiyama | 6bc235a | 2010-09-29 12:16:50 +0900 | [diff] [blame] | 83 | wake_up_interruptible(&dev->waitq); |
| 84 | return; |
| 85 | } |
| 86 | /* on success, sender woken up by CMD_ACK int in, or timeout */ |
| 87 | } |
| 88 | |
| 89 | static void yurex_delete(struct kref *kref) |
| 90 | { |
| 91 | struct usb_yurex *dev = to_yurex_dev(kref); |
| 92 | |
Greg Kroah-Hartman | aadd647 | 2012-05-01 21:34:11 -0700 | [diff] [blame] | 93 | dev_dbg(&dev->interface->dev, "%s\n", __func__); |
Tomoki Sekiyama | 6bc235a | 2010-09-29 12:16:50 +0900 | [diff] [blame] | 94 | |
| 95 | usb_put_dev(dev->udev); |
Tomoki Sekiyama | e06ea97 | 2010-10-03 06:59:06 +0900 | [diff] [blame] | 96 | if (dev->cntl_urb) { |
| 97 | usb_kill_urb(dev->cntl_urb); |
Tomoki Sekiyama | 523fc5c | 2012-03-30 08:51:28 +0900 | [diff] [blame] | 98 | kfree(dev->cntl_req); |
Tomoki Sekiyama | e06ea97 | 2010-10-03 06:59:06 +0900 | [diff] [blame] | 99 | if (dev->cntl_buffer) |
| 100 | usb_free_coherent(dev->udev, YUREX_BUF_SIZE, |
| 101 | dev->cntl_buffer, dev->cntl_urb->transfer_dma); |
| 102 | usb_free_urb(dev->cntl_urb); |
| 103 | } |
Tomoki Sekiyama | 6bc235a | 2010-09-29 12:16:50 +0900 | [diff] [blame] | 104 | if (dev->urb) { |
| 105 | usb_kill_urb(dev->urb); |
| 106 | if (dev->int_buffer) |
| 107 | usb_free_coherent(dev->udev, YUREX_BUF_SIZE, |
| 108 | dev->int_buffer, dev->urb->transfer_dma); |
| 109 | usb_free_urb(dev->urb); |
| 110 | } |
| 111 | kfree(dev); |
| 112 | } |
| 113 | |
| 114 | /* |
| 115 | * usb class driver info in order to get a minor number from the usb core, |
| 116 | * and to have the device registered with the driver core |
| 117 | */ |
| 118 | static struct usb_class_driver yurex_class = { |
| 119 | .name = "yurex%d", |
| 120 | .fops = &yurex_fops, |
| 121 | .minor_base = YUREX_MINOR_BASE, |
| 122 | }; |
| 123 | |
| 124 | static void yurex_interrupt(struct urb *urb) |
| 125 | { |
| 126 | struct usb_yurex *dev = urb->context; |
| 127 | unsigned char *buf = dev->int_buffer; |
| 128 | int status = urb->status; |
| 129 | unsigned long flags; |
| 130 | int retval, i; |
| 131 | |
| 132 | switch (status) { |
| 133 | case 0: /*success*/ |
| 134 | break; |
| 135 | case -EOVERFLOW: |
Greg Kroah-Hartman | 4571410 | 2012-04-20 16:53:56 -0700 | [diff] [blame] | 136 | dev_err(&dev->interface->dev, |
| 137 | "%s - overflow with length %d, actual length is %d\n", |
| 138 | __func__, YUREX_BUF_SIZE, dev->urb->actual_length); |
Tomoki Sekiyama | 6bc235a | 2010-09-29 12:16:50 +0900 | [diff] [blame] | 139 | case -ECONNRESET: |
| 140 | case -ENOENT: |
| 141 | case -ESHUTDOWN: |
| 142 | case -EILSEQ: |
| 143 | /* The device is terminated, clean up */ |
| 144 | return; |
| 145 | default: |
Greg Kroah-Hartman | 4571410 | 2012-04-20 16:53:56 -0700 | [diff] [blame] | 146 | dev_err(&dev->interface->dev, |
| 147 | "%s - unknown status received: %d\n", __func__, status); |
Tomoki Sekiyama | 6bc235a | 2010-09-29 12:16:50 +0900 | [diff] [blame] | 148 | goto exit; |
| 149 | } |
| 150 | |
| 151 | /* handle received message */ |
| 152 | switch (buf[0]) { |
| 153 | case CMD_COUNT: |
| 154 | case CMD_READ: |
| 155 | if (buf[6] == CMD_EOF) { |
| 156 | spin_lock_irqsave(&dev->lock, flags); |
| 157 | dev->bbu = 0; |
| 158 | for (i = 1; i < 6; i++) { |
| 159 | dev->bbu += buf[i]; |
| 160 | if (i != 5) |
| 161 | dev->bbu <<= 8; |
| 162 | } |
Greg Kroah-Hartman | aadd647 | 2012-05-01 21:34:11 -0700 | [diff] [blame] | 163 | dev_dbg(&dev->interface->dev, "%s count: %lld\n", |
| 164 | __func__, dev->bbu); |
Tomoki Sekiyama | 6bc235a | 2010-09-29 12:16:50 +0900 | [diff] [blame] | 165 | spin_unlock_irqrestore(&dev->lock, flags); |
| 166 | |
| 167 | kill_fasync(&dev->async_queue, SIGIO, POLL_IN); |
| 168 | } |
| 169 | else |
Greg Kroah-Hartman | aadd647 | 2012-05-01 21:34:11 -0700 | [diff] [blame] | 170 | dev_dbg(&dev->interface->dev, |
| 171 | "data format error - no EOF\n"); |
Tomoki Sekiyama | 6bc235a | 2010-09-29 12:16:50 +0900 | [diff] [blame] | 172 | break; |
| 173 | case CMD_ACK: |
Greg Kroah-Hartman | aadd647 | 2012-05-01 21:34:11 -0700 | [diff] [blame] | 174 | dev_dbg(&dev->interface->dev, "%s ack: %c\n", |
| 175 | __func__, buf[1]); |
Tomoki Sekiyama | 6bc235a | 2010-09-29 12:16:50 +0900 | [diff] [blame] | 176 | wake_up_interruptible(&dev->waitq); |
| 177 | break; |
| 178 | } |
| 179 | |
| 180 | exit: |
| 181 | retval = usb_submit_urb(dev->urb, GFP_ATOMIC); |
| 182 | if (retval) { |
Greg Kroah-Hartman | 4571410 | 2012-04-20 16:53:56 -0700 | [diff] [blame] | 183 | dev_err(&dev->interface->dev, "%s - usb_submit_urb failed: %d\n", |
Tomoki Sekiyama | 6bc235a | 2010-09-29 12:16:50 +0900 | [diff] [blame] | 184 | __func__, retval); |
| 185 | } |
| 186 | } |
| 187 | |
| 188 | static int yurex_probe(struct usb_interface *interface, const struct usb_device_id *id) |
| 189 | { |
| 190 | struct usb_yurex *dev; |
| 191 | struct usb_host_interface *iface_desc; |
| 192 | struct usb_endpoint_descriptor *endpoint; |
| 193 | int retval = -ENOMEM; |
Tomoki Sekiyama | 6bc235a | 2010-09-29 12:16:50 +0900 | [diff] [blame] | 194 | DEFINE_WAIT(wait); |
Johan Hovold | 499841e | 2017-03-17 11:35:45 +0100 | [diff] [blame] | 195 | int res; |
Tomoki Sekiyama | 6bc235a | 2010-09-29 12:16:50 +0900 | [diff] [blame] | 196 | |
| 197 | /* allocate memory for our device state and initialize it */ |
| 198 | dev = kzalloc(sizeof(*dev), GFP_KERNEL); |
Wolfram Sang | 0c2bc5c | 2016-08-25 19:39:25 +0200 | [diff] [blame] | 199 | if (!dev) |
Tomoki Sekiyama | 6bc235a | 2010-09-29 12:16:50 +0900 | [diff] [blame] | 200 | goto error; |
Tomoki Sekiyama | 6bc235a | 2010-09-29 12:16:50 +0900 | [diff] [blame] | 201 | kref_init(&dev->kref); |
| 202 | mutex_init(&dev->io_mutex); |
| 203 | spin_lock_init(&dev->lock); |
| 204 | init_waitqueue_head(&dev->waitq); |
| 205 | |
| 206 | dev->udev = usb_get_dev(interface_to_usbdev(interface)); |
| 207 | dev->interface = interface; |
| 208 | |
| 209 | /* set up the endpoint information */ |
| 210 | iface_desc = interface->cur_altsetting; |
Johan Hovold | 499841e | 2017-03-17 11:35:45 +0100 | [diff] [blame] | 211 | res = usb_find_int_in_endpoint(iface_desc, &endpoint); |
| 212 | if (res) { |
Greg Kroah-Hartman | 4571410 | 2012-04-20 16:53:56 -0700 | [diff] [blame] | 213 | dev_err(&interface->dev, "Could not find endpoints\n"); |
Johan Hovold | 499841e | 2017-03-17 11:35:45 +0100 | [diff] [blame] | 214 | retval = res; |
Tomoki Sekiyama | 6bc235a | 2010-09-29 12:16:50 +0900 | [diff] [blame] | 215 | goto error; |
| 216 | } |
| 217 | |
Johan Hovold | 499841e | 2017-03-17 11:35:45 +0100 | [diff] [blame] | 218 | dev->int_in_endpointAddr = endpoint->bEndpointAddress; |
Tomoki Sekiyama | 6bc235a | 2010-09-29 12:16:50 +0900 | [diff] [blame] | 219 | |
| 220 | /* allocate control URB */ |
| 221 | dev->cntl_urb = usb_alloc_urb(0, GFP_KERNEL); |
Wolfram Sang | 0450ba4 | 2016-08-11 23:14:45 +0200 | [diff] [blame] | 222 | if (!dev->cntl_urb) |
Tomoki Sekiyama | 6bc235a | 2010-09-29 12:16:50 +0900 | [diff] [blame] | 223 | goto error; |
Tomoki Sekiyama | 6bc235a | 2010-09-29 12:16:50 +0900 | [diff] [blame] | 224 | |
| 225 | /* allocate buffer for control req */ |
Tomoki Sekiyama | 523fc5c | 2012-03-30 08:51:28 +0900 | [diff] [blame] | 226 | dev->cntl_req = kmalloc(YUREX_BUF_SIZE, GFP_KERNEL); |
Wolfram Sang | 0c2bc5c | 2016-08-25 19:39:25 +0200 | [diff] [blame] | 227 | if (!dev->cntl_req) |
Tomoki Sekiyama | 6bc235a | 2010-09-29 12:16:50 +0900 | [diff] [blame] | 228 | goto error; |
Tomoki Sekiyama | 6bc235a | 2010-09-29 12:16:50 +0900 | [diff] [blame] | 229 | |
| 230 | /* allocate buffer for control msg */ |
| 231 | dev->cntl_buffer = usb_alloc_coherent(dev->udev, YUREX_BUF_SIZE, |
| 232 | GFP_KERNEL, |
| 233 | &dev->cntl_urb->transfer_dma); |
| 234 | if (!dev->cntl_buffer) { |
Greg Kroah-Hartman | 4571410 | 2012-04-20 16:53:56 -0700 | [diff] [blame] | 235 | dev_err(&interface->dev, "Could not allocate cntl_buffer\n"); |
Tomoki Sekiyama | 6bc235a | 2010-09-29 12:16:50 +0900 | [diff] [blame] | 236 | goto error; |
| 237 | } |
| 238 | |
| 239 | /* configure control URB */ |
| 240 | dev->cntl_req->bRequestType = USB_DIR_OUT | USB_TYPE_CLASS | |
| 241 | USB_RECIP_INTERFACE; |
| 242 | dev->cntl_req->bRequest = HID_REQ_SET_REPORT; |
| 243 | dev->cntl_req->wValue = cpu_to_le16((HID_OUTPUT_REPORT + 1) << 8); |
| 244 | dev->cntl_req->wIndex = cpu_to_le16(iface_desc->desc.bInterfaceNumber); |
| 245 | dev->cntl_req->wLength = cpu_to_le16(YUREX_BUF_SIZE); |
| 246 | |
| 247 | usb_fill_control_urb(dev->cntl_urb, dev->udev, |
| 248 | usb_sndctrlpipe(dev->udev, 0), |
| 249 | (void *)dev->cntl_req, dev->cntl_buffer, |
| 250 | YUREX_BUF_SIZE, yurex_control_callback, dev); |
Tomoki Sekiyama | e06ea97 | 2010-10-03 06:59:06 +0900 | [diff] [blame] | 251 | dev->cntl_urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP; |
Tomoki Sekiyama | 6bc235a | 2010-09-29 12:16:50 +0900 | [diff] [blame] | 252 | |
| 253 | |
| 254 | /* allocate interrupt URB */ |
| 255 | dev->urb = usb_alloc_urb(0, GFP_KERNEL); |
Wolfram Sang | 0450ba4 | 2016-08-11 23:14:45 +0200 | [diff] [blame] | 256 | if (!dev->urb) |
Tomoki Sekiyama | 6bc235a | 2010-09-29 12:16:50 +0900 | [diff] [blame] | 257 | goto error; |
Tomoki Sekiyama | 6bc235a | 2010-09-29 12:16:50 +0900 | [diff] [blame] | 258 | |
| 259 | /* allocate buffer for interrupt in */ |
| 260 | dev->int_buffer = usb_alloc_coherent(dev->udev, YUREX_BUF_SIZE, |
| 261 | GFP_KERNEL, &dev->urb->transfer_dma); |
| 262 | if (!dev->int_buffer) { |
Greg Kroah-Hartman | 4571410 | 2012-04-20 16:53:56 -0700 | [diff] [blame] | 263 | dev_err(&interface->dev, "Could not allocate int_buffer\n"); |
Tomoki Sekiyama | 6bc235a | 2010-09-29 12:16:50 +0900 | [diff] [blame] | 264 | goto error; |
| 265 | } |
| 266 | |
| 267 | /* configure interrupt URB */ |
| 268 | usb_fill_int_urb(dev->urb, dev->udev, |
| 269 | usb_rcvintpipe(dev->udev, dev->int_in_endpointAddr), |
| 270 | dev->int_buffer, YUREX_BUF_SIZE, yurex_interrupt, |
| 271 | dev, 1); |
Tomoki Sekiyama | 532f17b | 2012-03-30 08:51:36 +0900 | [diff] [blame] | 272 | dev->urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP; |
Tomoki Sekiyama | 6bc235a | 2010-09-29 12:16:50 +0900 | [diff] [blame] | 273 | if (usb_submit_urb(dev->urb, GFP_KERNEL)) { |
| 274 | retval = -EIO; |
Greg Kroah-Hartman | 4571410 | 2012-04-20 16:53:56 -0700 | [diff] [blame] | 275 | dev_err(&interface->dev, "Could not submitting URB\n"); |
Tomoki Sekiyama | 6bc235a | 2010-09-29 12:16:50 +0900 | [diff] [blame] | 276 | goto error; |
| 277 | } |
| 278 | |
| 279 | /* save our data pointer in this interface device */ |
| 280 | usb_set_intfdata(interface, dev); |
Oliver Neukum | c78d1ecf | 2014-05-19 13:52:20 +0200 | [diff] [blame] | 281 | dev->bbu = -1; |
Tomoki Sekiyama | 6bc235a | 2010-09-29 12:16:50 +0900 | [diff] [blame] | 282 | |
| 283 | /* we can register the device now, as it is ready */ |
| 284 | retval = usb_register_dev(interface, &yurex_class); |
| 285 | if (retval) { |
Greg Kroah-Hartman | 4571410 | 2012-04-20 16:53:56 -0700 | [diff] [blame] | 286 | dev_err(&interface->dev, |
| 287 | "Not able to get a minor for this device.\n"); |
Tomoki Sekiyama | 6bc235a | 2010-09-29 12:16:50 +0900 | [diff] [blame] | 288 | usb_set_intfdata(interface, NULL); |
| 289 | goto error; |
| 290 | } |
| 291 | |
Tomoki Sekiyama | 6bc235a | 2010-09-29 12:16:50 +0900 | [diff] [blame] | 292 | dev_info(&interface->dev, |
Tomoki Sekiyama | e06ea97 | 2010-10-03 06:59:06 +0900 | [diff] [blame] | 293 | "USB YUREX device now attached to Yurex #%d\n", |
Tomoki Sekiyama | 6bc235a | 2010-09-29 12:16:50 +0900 | [diff] [blame] | 294 | interface->minor); |
| 295 | |
| 296 | return 0; |
| 297 | |
| 298 | error: |
| 299 | if (dev) |
| 300 | /* this frees allocated memory */ |
| 301 | kref_put(&dev->kref, yurex_delete); |
| 302 | return retval; |
| 303 | } |
| 304 | |
| 305 | static void yurex_disconnect(struct usb_interface *interface) |
| 306 | { |
| 307 | struct usb_yurex *dev; |
| 308 | int minor = interface->minor; |
| 309 | |
| 310 | dev = usb_get_intfdata(interface); |
| 311 | usb_set_intfdata(interface, NULL); |
| 312 | |
| 313 | /* give back our minor */ |
| 314 | usb_deregister_dev(interface, &yurex_class); |
| 315 | |
| 316 | /* prevent more I/O from starting */ |
Alan Stern | ef61eb4 | 2019-04-23 14:48:29 -0400 | [diff] [blame] | 317 | usb_poison_urb(dev->urb); |
Tomoki Sekiyama | 6bc235a | 2010-09-29 12:16:50 +0900 | [diff] [blame] | 318 | mutex_lock(&dev->io_mutex); |
| 319 | dev->interface = NULL; |
| 320 | mutex_unlock(&dev->io_mutex); |
| 321 | |
| 322 | /* wakeup waiters */ |
| 323 | kill_fasync(&dev->async_queue, SIGIO, POLL_IN); |
| 324 | wake_up_interruptible(&dev->waitq); |
| 325 | |
| 326 | /* decrement our usage count */ |
| 327 | kref_put(&dev->kref, yurex_delete); |
| 328 | |
Tomoki Sekiyama | e06ea97 | 2010-10-03 06:59:06 +0900 | [diff] [blame] | 329 | dev_info(&interface->dev, "USB YUREX #%d now disconnected\n", minor); |
Tomoki Sekiyama | 6bc235a | 2010-09-29 12:16:50 +0900 | [diff] [blame] | 330 | } |
| 331 | |
| 332 | static struct usb_driver yurex_driver = { |
| 333 | .name = "yurex", |
| 334 | .probe = yurex_probe, |
| 335 | .disconnect = yurex_disconnect, |
| 336 | .id_table = yurex_table, |
| 337 | }; |
| 338 | |
| 339 | |
| 340 | static int yurex_fasync(int fd, struct file *file, int on) |
| 341 | { |
| 342 | struct usb_yurex *dev; |
| 343 | |
Arjun Sreedharan | 113ad91 | 2014-08-19 04:23:34 +0530 | [diff] [blame] | 344 | dev = file->private_data; |
Tomoki Sekiyama | 6bc235a | 2010-09-29 12:16:50 +0900 | [diff] [blame] | 345 | return fasync_helper(fd, file, on, &dev->async_queue); |
| 346 | } |
| 347 | |
| 348 | static int yurex_open(struct inode *inode, struct file *file) |
| 349 | { |
| 350 | struct usb_yurex *dev; |
| 351 | struct usb_interface *interface; |
| 352 | int subminor; |
| 353 | int retval = 0; |
| 354 | |
| 355 | subminor = iminor(inode); |
| 356 | |
| 357 | interface = usb_find_interface(&yurex_driver, subminor); |
| 358 | if (!interface) { |
Greg Kroah-Hartman | 4571410 | 2012-04-20 16:53:56 -0700 | [diff] [blame] | 359 | printk(KERN_ERR "%s - error, can't find device for minor %d", |
| 360 | __func__, subminor); |
Tomoki Sekiyama | 6bc235a | 2010-09-29 12:16:50 +0900 | [diff] [blame] | 361 | retval = -ENODEV; |
| 362 | goto exit; |
| 363 | } |
| 364 | |
| 365 | dev = usb_get_intfdata(interface); |
| 366 | if (!dev) { |
| 367 | retval = -ENODEV; |
| 368 | goto exit; |
| 369 | } |
| 370 | |
| 371 | /* increment our usage count for the device */ |
| 372 | kref_get(&dev->kref); |
| 373 | |
| 374 | /* save our object in the file's private structure */ |
| 375 | mutex_lock(&dev->io_mutex); |
| 376 | file->private_data = dev; |
| 377 | mutex_unlock(&dev->io_mutex); |
| 378 | |
| 379 | exit: |
| 380 | return retval; |
| 381 | } |
| 382 | |
| 383 | static int yurex_release(struct inode *inode, struct file *file) |
| 384 | { |
| 385 | struct usb_yurex *dev; |
| 386 | |
Arjun Sreedharan | 113ad91 | 2014-08-19 04:23:34 +0530 | [diff] [blame] | 387 | dev = file->private_data; |
Tomoki Sekiyama | 6bc235a | 2010-09-29 12:16:50 +0900 | [diff] [blame] | 388 | if (dev == NULL) |
| 389 | return -ENODEV; |
| 390 | |
Tomoki Sekiyama | 6bc235a | 2010-09-29 12:16:50 +0900 | [diff] [blame] | 391 | /* decrement the count on our device */ |
| 392 | kref_put(&dev->kref, yurex_delete); |
| 393 | return 0; |
| 394 | } |
| 395 | |
Sudip Mukherjee | 1cc373c | 2014-10-10 18:19:45 +0530 | [diff] [blame] | 396 | static ssize_t yurex_read(struct file *file, char __user *buffer, size_t count, |
| 397 | loff_t *ppos) |
Tomoki Sekiyama | 6bc235a | 2010-09-29 12:16:50 +0900 | [diff] [blame] | 398 | { |
| 399 | struct usb_yurex *dev; |
Jann Horn | f1e255d | 2018-07-06 17:12:56 +0200 | [diff] [blame] | 400 | int len = 0; |
Tomoki Sekiyama | 6bc235a | 2010-09-29 12:16:50 +0900 | [diff] [blame] | 401 | char in_buffer[20]; |
| 402 | unsigned long flags; |
| 403 | |
Arjun Sreedharan | 113ad91 | 2014-08-19 04:23:34 +0530 | [diff] [blame] | 404 | dev = file->private_data; |
Tomoki Sekiyama | 6bc235a | 2010-09-29 12:16:50 +0900 | [diff] [blame] | 405 | |
| 406 | mutex_lock(&dev->io_mutex); |
| 407 | if (!dev->interface) { /* already disconnected */ |
Jann Horn | f1e255d | 2018-07-06 17:12:56 +0200 | [diff] [blame] | 408 | mutex_unlock(&dev->io_mutex); |
| 409 | return -ENODEV; |
Tomoki Sekiyama | 6bc235a | 2010-09-29 12:16:50 +0900 | [diff] [blame] | 410 | } |
| 411 | |
| 412 | spin_lock_irqsave(&dev->lock, flags); |
Jann Horn | f1e255d | 2018-07-06 17:12:56 +0200 | [diff] [blame] | 413 | len = snprintf(in_buffer, 20, "%lld\n", dev->bbu); |
Tomoki Sekiyama | 6bc235a | 2010-09-29 12:16:50 +0900 | [diff] [blame] | 414 | spin_unlock_irqrestore(&dev->lock, flags); |
Tomoki Sekiyama | 6bc235a | 2010-09-29 12:16:50 +0900 | [diff] [blame] | 415 | mutex_unlock(&dev->io_mutex); |
Jann Horn | f1e255d | 2018-07-06 17:12:56 +0200 | [diff] [blame] | 416 | |
Ben Hutchings | 14427b8 | 2018-08-15 21:45:37 +0100 | [diff] [blame] | 417 | if (WARN_ON_ONCE(len >= sizeof(in_buffer))) |
| 418 | return -EIO; |
| 419 | |
Jann Horn | f1e255d | 2018-07-06 17:12:56 +0200 | [diff] [blame] | 420 | return simple_read_from_buffer(buffer, count, ppos, in_buffer, len); |
Tomoki Sekiyama | 6bc235a | 2010-09-29 12:16:50 +0900 | [diff] [blame] | 421 | } |
| 422 | |
Sudip Mukherjee | 1cc373c | 2014-10-10 18:19:45 +0530 | [diff] [blame] | 423 | static ssize_t yurex_write(struct file *file, const char __user *user_buffer, |
| 424 | size_t count, loff_t *ppos) |
Tomoki Sekiyama | 6bc235a | 2010-09-29 12:16:50 +0900 | [diff] [blame] | 425 | { |
| 426 | struct usb_yurex *dev; |
| 427 | int i, set = 0, retval = 0; |
Ben Hutchings | 7e10f14 | 2018-08-15 21:44:25 +0100 | [diff] [blame] | 428 | char buffer[16 + 1]; |
Tomoki Sekiyama | 6bc235a | 2010-09-29 12:16:50 +0900 | [diff] [blame] | 429 | char *data = buffer; |
| 430 | unsigned long long c, c2 = 0; |
| 431 | signed long timeout = 0; |
| 432 | DEFINE_WAIT(wait); |
| 433 | |
Ben Hutchings | 7e10f14 | 2018-08-15 21:44:25 +0100 | [diff] [blame] | 434 | count = min(sizeof(buffer) - 1, count); |
Arjun Sreedharan | 113ad91 | 2014-08-19 04:23:34 +0530 | [diff] [blame] | 435 | dev = file->private_data; |
Tomoki Sekiyama | 6bc235a | 2010-09-29 12:16:50 +0900 | [diff] [blame] | 436 | |
| 437 | /* verify that we actually have some data to write */ |
| 438 | if (count == 0) |
| 439 | goto error; |
| 440 | |
| 441 | mutex_lock(&dev->io_mutex); |
Rahul Bedarkar | 3fb4c07 | 2013-12-30 20:49:19 +0530 | [diff] [blame] | 442 | if (!dev->interface) { /* already disconnected */ |
Tomoki Sekiyama | 6bc235a | 2010-09-29 12:16:50 +0900 | [diff] [blame] | 443 | mutex_unlock(&dev->io_mutex); |
| 444 | retval = -ENODEV; |
| 445 | goto error; |
| 446 | } |
| 447 | |
| 448 | if (copy_from_user(buffer, user_buffer, count)) { |
| 449 | mutex_unlock(&dev->io_mutex); |
| 450 | retval = -EFAULT; |
| 451 | goto error; |
| 452 | } |
Ben Hutchings | 7e10f14 | 2018-08-15 21:44:25 +0100 | [diff] [blame] | 453 | buffer[count] = 0; |
Tomoki Sekiyama | 6bc235a | 2010-09-29 12:16:50 +0900 | [diff] [blame] | 454 | memset(dev->cntl_buffer, CMD_PADDING, YUREX_BUF_SIZE); |
| 455 | |
| 456 | switch (buffer[0]) { |
| 457 | case CMD_ANIMATE: |
| 458 | case CMD_LED: |
| 459 | dev->cntl_buffer[0] = buffer[0]; |
| 460 | dev->cntl_buffer[1] = buffer[1]; |
| 461 | dev->cntl_buffer[2] = CMD_EOF; |
| 462 | break; |
| 463 | case CMD_READ: |
| 464 | case CMD_VERSION: |
| 465 | dev->cntl_buffer[0] = buffer[0]; |
| 466 | dev->cntl_buffer[1] = 0x00; |
| 467 | dev->cntl_buffer[2] = CMD_EOF; |
| 468 | break; |
| 469 | case CMD_SET: |
| 470 | data++; |
| 471 | /* FALL THROUGH */ |
| 472 | case '0' ... '9': |
| 473 | set = 1; |
| 474 | c = c2 = simple_strtoull(data, NULL, 0); |
| 475 | dev->cntl_buffer[0] = CMD_SET; |
| 476 | for (i = 1; i < 6; i++) { |
| 477 | dev->cntl_buffer[i] = (c>>32) & 0xff; |
| 478 | c <<= 8; |
| 479 | } |
| 480 | buffer[6] = CMD_EOF; |
| 481 | break; |
| 482 | default: |
| 483 | mutex_unlock(&dev->io_mutex); |
| 484 | return -EINVAL; |
| 485 | } |
| 486 | |
| 487 | /* send the data as the control msg */ |
| 488 | prepare_to_wait(&dev->waitq, &wait, TASK_INTERRUPTIBLE); |
Greg Kroah-Hartman | aadd647 | 2012-05-01 21:34:11 -0700 | [diff] [blame] | 489 | dev_dbg(&dev->interface->dev, "%s - submit %c\n", __func__, |
| 490 | dev->cntl_buffer[0]); |
Tomoki Sekiyama | 6bc235a | 2010-09-29 12:16:50 +0900 | [diff] [blame] | 491 | retval = usb_submit_urb(dev->cntl_urb, GFP_KERNEL); |
| 492 | if (retval >= 0) |
| 493 | timeout = schedule_timeout(YUREX_WRITE_TIMEOUT); |
| 494 | finish_wait(&dev->waitq, &wait); |
| 495 | |
| 496 | mutex_unlock(&dev->io_mutex); |
| 497 | |
| 498 | if (retval < 0) { |
Greg Kroah-Hartman | 4571410 | 2012-04-20 16:53:56 -0700 | [diff] [blame] | 499 | dev_err(&dev->interface->dev, |
| 500 | "%s - failed to send bulk msg, error %d\n", |
| 501 | __func__, retval); |
Tomoki Sekiyama | 6bc235a | 2010-09-29 12:16:50 +0900 | [diff] [blame] | 502 | goto error; |
| 503 | } |
| 504 | if (set && timeout) |
| 505 | dev->bbu = c2; |
| 506 | return timeout ? count : -EIO; |
| 507 | |
| 508 | error: |
| 509 | return retval; |
| 510 | } |
| 511 | |
| 512 | static const struct file_operations yurex_fops = { |
| 513 | .owner = THIS_MODULE, |
| 514 | .read = yurex_read, |
| 515 | .write = yurex_write, |
| 516 | .open = yurex_open, |
| 517 | .release = yurex_release, |
| 518 | .fasync = yurex_fasync, |
Tomoki Sekiyama | 27f485b | 2010-11-22 19:29:23 +0900 | [diff] [blame] | 519 | .llseek = default_llseek, |
Tomoki Sekiyama | 6bc235a | 2010-09-29 12:16:50 +0900 | [diff] [blame] | 520 | }; |
| 521 | |
Greg Kroah-Hartman | 65db430 | 2011-11-18 09:34:02 -0800 | [diff] [blame] | 522 | module_usb_driver(yurex_driver); |
Tomoki Sekiyama | 6bc235a | 2010-09-29 12:16:50 +0900 | [diff] [blame] | 523 | |
| 524 | MODULE_LICENSE("GPL"); |