| Start/ | End/ | |||
| True | False | - | Line | Source |
| 1 | /* | |||
| 2 | * LEGO USB Tower driver | |||
| 3 | * | |||
| 4 | * Copyright (C) 2003 David Glance <davidgsf@sourceforge.net> | |||
| 5 | * 2001-2004 Juergen Stuber <starblue@users.sourceforge.net> | |||
| 6 | * | |||
| 7 | * This program is free software; you can redistribute it and/or | |||
| 8 | * modify it under the terms of the GNU General Public License as | |||
| 9 | * published by the Free Software Foundation; either version 2 of | |||
| 10 | * the License, or (at your option) any later version. | |||
| 11 | * | |||
| 12 | * derived from USB Skeleton driver - 0.5 | |||
| 13 | * Copyright (C) 2001 Greg Kroah-Hartman (greg@kroah.com) | |||
| 14 | * | |||
| 15 | * History: | |||
| 16 | * | |||
| 17 | * 2001-10-13 - 0.1 js | |||
| 18 | * - first version | |||
| 19 | * 2001-11-03 - 0.2 js | |||
| 20 | * - simplified buffering, one-shot URBs for writing | |||
| 21 | * 2001-11-10 - 0.3 js | |||
| 22 | * - removed IOCTL (setting power/mode is more complicated, postponed) | |||
| 23 | * 2001-11-28 - 0.4 js | |||
| 24 | * - added vendor commands for mode of operation and power level in open | |||
| 25 | * 2001-12-04 - 0.5 js | |||
| 26 | * - set IR mode by default (by oversight 0.4 set VLL mode) | |||
| 27 | * 2002-01-11 - 0.5? pcchan | |||
| 28 | * - make read buffer reusable and work around bytes_to_write issue between | |||
| 29 | * uhci and legusbtower | |||
| 30 | * 2002-09-23 - 0.52 david (david@csse.uwa.edu.au) | |||
| 31 | * - imported into lejos project | |||
| 32 | * - changed wake_up to wake_up_interruptible | |||
| 33 | * - changed to use lego0 rather than tower0 | |||
| 34 | * - changed dbg() to use __func__ rather than deprecated __FUNCTION__ | |||
| 35 | * 2003-01-12 - 0.53 david (david@csse.uwa.edu.au) | |||
| 36 | * - changed read and write to write everything or | |||
| 37 | * timeout (from a patch by Chris Riesen and Brett Thaeler driver) | |||
| 38 | * - added ioctl functionality to set timeouts | |||
| 39 | * 2003-07-18 - 0.54 davidgsf (david@csse.uwa.edu.au) | |||
| 40 | * - initial import into LegoUSB project | |||
| 41 | * - merge of existing LegoUSB.c driver | |||
| 42 | * 2003-07-18 - 0.56 davidgsf (david@csse.uwa.edu.au) | |||
| 43 | * - port to 2.6 style driver | |||
| 44 | * 2004-02-29 - 0.6 Juergen Stuber <starblue@users.sourceforge.net> | |||
| 45 | * - fix locking | |||
| 46 | * - unlink read URBs which are no longer needed | |||
| 47 | * - allow increased buffer size, eliminates need for timeout on write | |||
| 48 | * - have read URB running continuously | |||
| 49 | * - added poll | |||
| 50 | * - forbid seeking | |||
| 51 | * - added nonblocking I/O | |||
| 52 | * - changed back __func__ to __FUNCTION__ | |||
| 53 | * - read and log tower firmware version | |||
| 54 | * - reset tower on probe, avoids failure of first write | |||
| 55 | * 2004-03-09 - 0.7 Juergen Stuber <starblue@users.sourceforge.net> | |||
| 56 | * - timeout read now only after inactivity, shorten default accordingly | |||
| 57 | * 2004-03-11 - 0.8 Juergen Stuber <starblue@users.sourceforge.net> | |||
| 58 | * - log major, minor instead of possibly confusing device filename | |||
| 59 | * - whitespace cleanup | |||
| 60 | * 2004-03-12 - 0.9 Juergen Stuber <starblue@users.sourceforge.net> | |||
| 61 | * - normalize whitespace in debug messages | |||
| 62 | * - take care about endianness in control message responses | |||
| 63 | * 2004-03-13 - 0.91 Juergen Stuber <starblue@users.sourceforge.net> | |||
| 64 | * - make default intervals longer to accommodate current EHCI driver | |||
| 65 | * 2004-03-19 - 0.92 Juergen Stuber <starblue@users.sourceforge.net> | |||
| 66 | * - replaced atomic_t by memory barriers | |||
| 67 | * 2004-04-21 - 0.93 Juergen Stuber <starblue@users.sourceforge.net> | |||
| 68 | * - wait for completion of write urb in release (needed for remotecontrol) | |||
| 69 | * - corrected poll for write direction (missing negation) | |||
| 70 | * 2004-04-22 - 0.94 Juergen Stuber <starblue@users.sourceforge.net> | |||
| 71 | * - make device locking interruptible | |||
| 72 | * 2004-04-30 - 0.95 Juergen Stuber <starblue@users.sourceforge.net> | |||
| 73 | * - check for valid udev on resubmitting and unlinking urbs | |||
| 74 | * 2004-08-03 - 0.96 Juergen Stuber <starblue@users.sourceforge.net> | |||
| 75 | * - move reset into open to clean out spurious data | |||
| 76 | */ | |||
| 77 | ||||
| 78 | #include <linux/config.h> | |||
| 79 | #include <linux/kernel.h> | |||
| 80 | #include <linux/errno.h> | |||
| 81 | #include <linux/init.h> | |||
| 82 | #include <linux/slab.h> | |||
| 83 | #include <linux/module.h> | |||
| 84 | #include <linux/smp_lock.h> | |||
| 85 | #include <linux/completion.h> | |||
| 86 | #include <asm/uaccess.h> | |||
| 87 | #include <linux/usb.h> | |||
| 88 | #include <linux/poll.h> | |||
| 89 | ||||
| 90 | ||||
| 91 | #ifdef CONFIG_USB_DEBUG | |||
| 92 | static int debug = 4; | |||
| 93 | #else | |||
| 94 | static int debug = 0; | |||
| 95 | #endif | |||
| 96 | ||||
| 97 | /* Use our own dbg macro */ | |||
| 98 | #undef dbg | |||
| 99 | #define dbg(lvl, format, arg...) do { if (debug >= lvl) printk(KERN_DEBUG __FILE__ ": " format "\n", ## arg); } while (0) | |||
| 100 | ||||
| 101 | ||||
| 102 | /* Version Information */ | |||
| 103 | #define DRIVER_VERSION "v0.96" | |||
| 104 | #define DRIVER_AUTHOR "Juergen Stuber <starblue@sourceforge.net>" | |||
| 105 | #define DRIVER_DESC "LEGO USB Tower Driver" | |||
| 106 | ||||
| 107 | /* Module parameters */ | |||
| 0 | 0 | - | 108 | module_param(debug, int, S_IRUGO | S_IWUSR); |
| 0 | - | 108 | return ( & ( debug ) ) | |
| 109 | MODULE_PARM_DESC(debug, "Debug enabled or not"); | |||
| 110 | ||||
| 111 | /* The defaults are chosen to work with the latest versions of leJOS and NQC. | |||
| 112 | */ | |||
| 113 | ||||
| 114 | /* Some legacy software likes to receive packets in one piece. | |||
| 115 | * In this case read_buffer_size should exceed the maximal packet length | |||
| 116 | * (417 for datalog uploads), and packet_timeout should be set. | |||
| 117 | */ | |||
| 118 | static int read_buffer_size = 480; | |||
| 0 | 0 | - | 119 | module_param(read_buffer_size, int, 0); |
| 0 | - | 119 | return ( & ( read_buffer_size ) ) | |
| 120 | MODULE_PARM_DESC(read_buffer_size, "Read buffer size"); | |||
| 121 | ||||
| 122 | /* Some legacy software likes to send packets in one piece. | |||
| 123 | * In this case write_buffer_size should exceed the maximal packet length | |||
| 124 | * (417 for firmware and program downloads). | |||
| 125 | * A problem with long writes is that the following read may time out | |||
| 126 | * if the software is not prepared to wait long enough. | |||
| 127 | */ | |||
| 128 | static int write_buffer_size = 480; | |||
| 0 | 0 | - | 129 | module_param(write_buffer_size, int, 0); |
| 0 | - | 129 | return ( & ( write_buffer_size ) ) | |
| 130 | MODULE_PARM_DESC(write_buffer_size, "Write buffer size"); | |||
| 131 | ||||
| 132 | /* Some legacy software expects reads to contain whole LASM packets. | |||
| 133 | * To achieve this, characters which arrive before a packet timeout | |||
| 134 | * occurs will be returned in a single read operation. | |||
| 135 | * A problem with long reads is that the software may time out | |||
| 136 | * if it is not prepared to wait long enough. | |||
| 137 | * The packet timeout should be greater than the time between the | |||
| 138 | * reception of subsequent characters, which should arrive about | |||
| 139 | * every 5ms for the standard 2400 baud. | |||
| 140 | * Set it to 0 to disable. | |||
| 141 | */ | |||
| 142 | static int packet_timeout = 50; | |||
| 0 | 0 | - | 143 | module_param(packet_timeout, int, 0); |
| 0 | - | 143 | return ( & ( packet_timeout ) ) | |
| 144 | MODULE_PARM_DESC(packet_timeout, "Packet timeout in ms"); | |||
| 145 | ||||
| 146 | /* Some legacy software expects blocking reads to time out. | |||
| 147 | * Timeout occurs after the specified time of read and write inactivity. | |||
| 148 | * Set it to 0 to disable. | |||
| 149 | */ | |||
| 150 | static int read_timeout = 200; | |||
| 0 | 0 | - | 151 | module_param(read_timeout, int, 0); |
| 0 | - | 151 | return ( & ( read_timeout ) ) | |
| 152 | MODULE_PARM_DESC(read_timeout, "Read timeout in ms"); | |||
| 153 | ||||
| 154 | /* As of kernel version 2.6.4 ehci-hcd uses an | |||
| 155 | * "only one interrupt transfer per frame" shortcut | |||
| 156 | * to simplify the scheduling of periodic transfers. | |||
| 157 | * This conflicts with our standard 1ms intervals for in and out URBs. | |||
| 158 | * We use default intervals of 2ms for in and 8ms for out transfers, | |||
| 159 | * which is fast enough for 2400 baud and allows a small additional load. | |||
| 160 | * Increase the interval to allow more devices that do interrupt transfers, | |||
| 161 | * or set to 0 to use the standard interval from the endpoint descriptors. | |||
| 162 | */ | |||
| 163 | static int interrupt_in_interval = 2; | |||
| 0 | 0 | - | 164 | module_param(interrupt_in_interval, int, 0); |
| 0 | - | 164 | return ( & ( interrupt_in_interval ) ) | |
| 165 | MODULE_PARM_DESC(interrupt_in_interval, "Interrupt in interval in ms"); | |||
| 166 | ||||
| 167 | static int interrupt_out_interval = 8; | |||
| 0 | 0 | - | 168 | module_param(interrupt_out_interval, int, 0); |
| 0 | - | 168 | return ( & ( interrupt_out_interval ) ) | |
| 169 | MODULE_PARM_DESC(interrupt_out_interval, "Interrupt out interval in ms"); | |||
| 170 | ||||
| 171 | /* Define these values to match your device */ | |||
| 172 | #define LEGO_USB_TOWER_VENDOR_ID 0x0694 | |||
| 173 | #define LEGO_USB_TOWER_PRODUCT_ID 0x0001 | |||
| 174 | ||||
| 175 | /* Vendor requests */ | |||
| 176 | #define LEGO_USB_TOWER_REQUEST_RESET 0x04 | |||
| 177 | #define LEGO_USB_TOWER_REQUEST_GET_VERSION 0xFD | |||
| 178 | ||||
| 179 | struct tower_reset_reply { | |||
| 180 | __le16 size; /* little-endian */ | |||
| 181 | __u8 err_code; | |||
| 182 | __u8 spare; | |||
| 183 | } __attribute__ ((packed)); | |||
| 184 | ||||
| 185 | struct tower_get_version_reply { | |||
| 186 | __le16 size; /* little-endian */ | |||
| 187 | __u8 err_code; | |||
| 188 | __u8 spare; | |||
| 189 | __u8 major; | |||
| 190 | __u8 minor; | |||
| 191 | __le16 build_no; /* little-endian */ | |||
| 192 | } __attribute__ ((packed)); | |||
| 193 | ||||
| 194 | ||||
| 195 | /* table of devices that work with this driver */ | |||
| 196 | static struct usb_device_id tower_table [] = { | |||
| 197 | { USB_DEVICE(LEGO_USB_TOWER_VENDOR_ID, LEGO_USB_TOWER_PRODUCT_ID) }, | |||
| 198 | { } /* Terminating entry */ | |||
| 199 | }; | |||
| 200 | ||||
| 201 | MODULE_DEVICE_TABLE (usb, tower_table); | |||
| 202 | ||||
| 203 | #define LEGO_USB_TOWER_MINOR_BASE 160 | |||
| 204 | ||||
| 205 | ||||
| 206 | /* Structure to hold all of our device specific stuff */ | |||
| 207 | struct lego_usb_tower { | |||
| 208 | struct semaphore sem; /* locks this structure */ | |||
| 209 | struct usb_device* udev; /* save off the usb device pointer */ | |||
| 210 | unsigned char minor; /* the starting minor number for this device */ | |||
| 211 | ||||
| 212 | int open_count; /* number of times this port has been opened */ | |||
| 213 | ||||
| 214 | char* read_buffer; | |||
| 215 | size_t read_buffer_length; /* this much came in */ | |||
| 216 | size_t read_packet_length; /* this much will be returned on read */ | |||
| 217 | spinlock_t read_buffer_lock; | |||
| 218 | int packet_timeout_jiffies; | |||
| 219 | unsigned long read_last_arrival; | |||
| 220 | ||||
| 221 | wait_queue_head_t read_wait; | |||
| 222 | wait_queue_head_t write_wait; | |||
| 223 | ||||
| 224 | char* interrupt_in_buffer; | |||
| 225 | struct usb_endpoint_descriptor* interrupt_in_endpoint; | |||
| 226 | struct urb* interrupt_in_urb; | |||
| 227 | int interrupt_in_interval; | |||
| 228 | int interrupt_in_running; | |||
| 229 | int interrupt_in_done; | |||
| 230 | ||||
| 231 | char* interrupt_out_buffer; | |||
| 232 | struct usb_endpoint_descriptor* interrupt_out_endpoint; | |||
| 233 | struct urb* interrupt_out_urb; | |||
| 234 | int interrupt_out_interval; | |||
| 235 | int interrupt_out_busy; | |||
| 236 | ||||
| 237 | }; | |||
| 238 | ||||
| 239 | ||||
| 240 | /* local function prototypes */ | |||
| 241 | static ssize_t tower_read (struct file *file, char __user *buffer, size_t count, loff_t *ppos); | |||
| 242 | static ssize_t tower_write (struct file *file, const char __user *buffer, size_t count, loff_t *ppos); | |||
| 243 | static inline void tower_delete (struct lego_usb_tower *dev); | |||
| 244 | static int tower_open (struct inode *inode, struct file *file); | |||
| 245 | static int tower_release (struct inode *inode, struct file *file); | |||
| 246 | static unsigned int tower_poll (struct file *file, poll_table *wait); | |||
| 247 | static loff_t tower_llseek (struct file *file, loff_t off, int whence); | |||
| 248 | ||||
| 249 | static void tower_abort_transfers (struct lego_usb_tower *dev); | |||
| 250 | static void tower_check_for_read_packet (struct lego_usb_tower *dev); | |||
| 251 | static void tower_interrupt_in_callback (struct urb *urb, struct pt_regs *regs); | |||
| 252 | static void tower_interrupt_out_callback (struct urb *urb, struct pt_regs *regs); | |||
| 253 | ||||
| 254 | static int tower_probe (struct usb_interface *interface, const struct usb_device_id *id); | |||
| 255 | static void tower_disconnect (struct usb_interface *interface); | |||
| 256 | ||||
| 257 | ||||
| 258 | /* prevent races between open() and disconnect */ | |||
| 259 | static DECLARE_MUTEX (disconnect_sem); | |||
| 260 | ||||
| 261 | /* file operations needed when we register this driver */ | |||
| 262 | static struct file_operations tower_fops = { | |||
| 263 | .owner = THIS_MODULE, | |||
| 264 | .read = tower_read, | |||
| 265 | .write = tower_write, | |||
| 266 | .open = tower_open, | |||
| 267 | .release = tower_release, | |||
| 268 | .poll = tower_poll, | |||
| 269 | .llseek = tower_llseek, | |||
| 270 | }; | |||
| 271 | ||||
| 272 | /* | |||
| 273 | * usb class driver info in order to get a minor number from the usb core, | |||
| 274 | * and to have the device registered with the driver core | |||
| 275 | */ | |||
| 276 | static struct usb_class_driver tower_class = { | |||
| 277 | .name = "legousbtower%d", | |||
| 278 | .fops = &tower_fops, | |||
| 279 | .minor_base = LEGO_USB_TOWER_MINOR_BASE, | |||
| 280 | }; | |||
| 281 | ||||
| 282 | ||||
| 283 | /* usb specific object needed to register this driver with the usb subsystem */ | |||
| 284 | static struct usb_driver tower_driver = { | |||
| 285 | .name = "legousbtower", | |||
| 286 | .probe = tower_probe, | |||
| 287 | .disconnect = tower_disconnect, | |||
| 288 | .id_table = tower_table, | |||
| 289 | }; | |||
| 290 | ||||
| 291 | ||||
| 292 | /** | |||
| 293 | * lego_usb_tower_debug_data | |||
| 294 | */ | |||
| 0 | 0 | - | 295 | static inline void lego_usb_tower_debug_data (int level, const char *function, int size, const unsigned char *data) |
| 296 | { | |||
| 297 | int i; | |||
| 298 | ||||
| 0 | 0 | - | 299 | if (debug < level) |
| 0 | - | 300 | return; | |
| 301 | ||||
| 302 | printk (KERN_DEBUG __FILE__": %s - length = %d, data = ", function, size); | |||
| 0 | 0 | - | 303 | for (i = 0; i < size; ++i) { |
| 304 | printk ("%.2x ", data[i]); | |||
| 305 | } | |||
| 306 | printk ("\n"); | |||
| 307 | } | |||
| 308 | ||||
| 309 | ||||
| 310 | /** | |||
| 311 | * tower_delete | |||
| 312 | */ | |||
| 0 | 0 | - | 313 | static inline void tower_delete (struct lego_usb_tower *dev) |
| 314 | { | |||
| 315 | dbg(2, "%s: enter", __FUNCTION__); | |||
| 0 | 0 | - | 315 | if (debug >= 2) |
| 0 | 0 | - | 315 | do-while (0) |
| 316 | ||||
| 317 | tower_abort_transfers (dev); | |||
| 318 | ||||
| 319 | /* free data structures */ | |||
| 0 | 0 | - | 320 | if (dev->interrupt_in_urb != NULL) { |
| 321 | usb_free_urb (dev->interrupt_in_urb); | |||
| 322 | } | |||
| 0 | 0 | - | 323 | if (dev->interrupt_out_urb != NULL) { |
| 324 | usb_free_urb (dev->interrupt_out_urb); | |||
| 325 | } | |||
| 326 | kfree (dev->read_buffer); | |||
| 327 | kfree (dev->interrupt_in_buffer); | |||
| 328 | kfree (dev->interrupt_out_buffer); | |||
| 329 | kfree (dev); | |||
| 330 | ||||
| 331 | dbg(2, "%s: leave", __FUNCTION__); | |||
| 0 | 0 | - | 331 | if (debug >= 2) |
| 0 | 0 | - | 331 | do-while (0) |
| 332 | } | |||
| 333 | ||||
| 334 | ||||
| 335 | /** | |||
| 336 | * tower_open | |||
| 337 | */ | |||
| 0 | 0 | - | 338 | static int tower_open (struct inode *inode, struct file *file) |
| 339 | { | |||
| 340 | struct lego_usb_tower *dev = NULL; | |||
| 341 | int subminor; | |||
| 342 | int retval = 0; | |||
| 343 | struct usb_interface *interface; | |||
| 344 | struct tower_reset_reply reset_reply; | |||
| 345 | int result; | |||
| 346 | ||||
| 347 | dbg(2, "%s: enter", __FUNCTION__); | |||
| 0 | 0 | - | 347 | if (debug >= 2) |
| 0 | 0 | - | 347 | do-while (0) |
| 348 | ||||
| 349 | nonseekable_open(inode, file); | |||
| 350 | subminor = iminor(inode); | |||
| 351 | ||||
| 352 | down (&disconnect_sem); | |||
| 353 | ||||
| 354 | interface = usb_find_interface (&tower_driver, subminor); | |||
| 355 | ||||
| 0 | 0 | - | 356 | if (!interface) { |
| 357 | err ("%s - error, can't find device for minor %d", | |||
| 358 | __FUNCTION__, subminor); | |||
| 359 | retval = -ENODEV; | |||
| 0 | - | 360 | goto unlock_disconnect_exit; | |
| 361 | } | |||
| 362 | ||||
| 363 | dev = usb_get_intfdata(interface); | |||
| 364 | ||||
| 0 | 0 | - | 365 | if (!dev) { |
| 366 | retval = -ENODEV; | |||
| 0 | - | 367 | goto unlock_disconnect_exit; | |
| 368 | } | |||
| 369 | ||||
| 370 | /* lock this device */ | |||
| 0 | 0 | - | 371 | if (down_interruptible (&dev->sem)) { |
| 372 | retval = -ERESTARTSYS; | |||
| 0 | - | 373 | goto unlock_disconnect_exit; | |
| 374 | } | |||
| 375 | ||||
| 376 | /* allow opening only once */ | |||
| 0 | 0 | - | 377 | if (dev->open_count) { |
| 378 | retval = -EBUSY; | |||
| 0 | - | 379 | goto unlock_exit; | |
| 380 | } | |||
| 381 | dev->open_count = 1; | |||
| 382 | ||||
| 383 | /* reset the tower */ | |||
| 384 | result = usb_control_msg (dev->udev, | |||
| 385 | usb_rcvctrlpipe(dev->udev, 0), | |||
| 386 | LEGO_USB_TOWER_REQUEST_RESET, | |||
| 387 | USB_TYPE_VENDOR | USB_DIR_IN | USB_RECIP_DEVICE, | |||
| 388 | 0, | |||
| 389 | 0, | |||
| 390 | &reset_reply, | |||
| 391 | sizeof(reset_reply), | |||
| 392 | 1000); | |||
| 0 | 0 | - | 393 | if (result < 0) { |
| 394 | err("LEGO USB Tower reset control request failed"); | |||
| 395 | retval = result; | |||
| 0 | - | 396 | goto unlock_exit; | |
| 397 | } | |||
| 398 | ||||
| 399 | /* initialize in direction */ | |||
| 400 | dev->read_buffer_length = 0; | |||
| 401 | dev->read_packet_length = 0; | |||
| 402 | usb_fill_int_urb (dev->interrupt_in_urb, | |||
| 403 | dev->udev, | |||
| 404 | usb_rcvintpipe(dev->udev, dev->interrupt_in_endpoint->bEndpointAddress), | |||
| 405 | dev->interrupt_in_buffer, | |||
| 406 | le16_to_cpu(dev->interrupt_in_endpoint->wMaxPacketSize), | |||
| 407 | tower_interrupt_in_callback, | |||
| 408 | dev, | |||
| 409 | dev->interrupt_in_interval); | |||
| 410 | ||||
| 411 | dev->interrupt_in_running = 1; | |||
| 412 | dev->interrupt_in_done = 0; | |||
| 413 | mb(); | |||
| 414 | ||||
| 415 | retval = usb_submit_urb (dev->interrupt_in_urb, GFP_KERNEL); | |||
| 0 | 0 | - | 416 | if (retval) { |
| 417 | err("Couldn't submit interrupt_in_urb %d", retval); | |||
| 418 | dev->interrupt_in_running = 0; | |||
| 419 | dev->open_count = 0; | |||
| 0 | - | 420 | goto unlock_exit; | |
| 421 | } | |||
| 422 | ||||
| 423 | /* save device in the file's private structure */ | |||
| 424 | file->private_data = dev; | |||
| 425 | ||||
| 426 | unlock_exit: | |||
| 427 | up (&dev->sem); | |||
| 428 | ||||
| 429 | unlock_disconnect_exit: | |||
| 430 | up (&disconnect_sem); | |||
| 431 | ||||
| 432 | dbg(2, "%s: leave, return value %d ", __FUNCTION__, retval); | |||
| 0 | 0 | - | 432 | if (debug >= 2) |
| 0 | 0 | - | 432 | do-while (0) |
| 433 | ||||
| 0 | - | 434 | return retval; | |
| 435 | } | |||
| 436 | ||||
| 437 | /** | |||
| 438 | * tower_release | |||
| 439 | */ | |||
| 0 | 0 | - | 440 | static int tower_release (struct inode *inode, struct file *file) |
| 441 | { | |||
| 442 | struct lego_usb_tower *dev; | |||
| 443 | int retval = 0; | |||
| 444 | ||||
| 445 | dbg(2, "%s: enter", __FUNCTION__); | |||
| 0 | 0 | - | 445 | if (debug >= 2) |
| 0 | 0 | - | 445 | do-while (0) |
| 446 | ||||
| 447 | dev = (struct lego_usb_tower *)file->private_data; | |||
| 448 | ||||
| 0 | 0 | - | 449 | if (dev == NULL) { |
| 450 | dbg(1, "%s: object is NULL", __FUNCTION__); | |||
| 0 | 0 | - | 450 | if (debug >= 1) |
| 0 | 0 | - | 450 | do-while (0) |
| 451 | retval = -ENODEV; | |||
| 0 | - | 452 | goto exit; | |
| 453 | } | |||
| 454 | ||||
| 0 | 0 | - | 455 | if (down_interruptible (&dev->sem)) { |
| 456 | retval = -ERESTARTSYS; | |||
| 0 | - | 457 | goto exit; | |
| 458 | } | |||
| 459 | ||||
| 0 | 0 | - | 460 | if (dev->open_count != 1) { |
| 461 | dbg(1, "%s: device not opened exactly once", __FUNCTION__); | |||
| 0 | 0 | - | 461 | if (debug >= 1) |
| 0 | 0 | - | 461 | do-while (0) |
| 462 | retval = -ENODEV; | |||
| 0 | - | 463 | goto unlock_exit; | |
| 464 | } | |||
| 0 | 0 | - | 465 | if (dev->udev == NULL) { |
| 466 | /* the device was unplugged before the file was released */ | |||
| 467 | up (&dev->sem); /* unlock here as tower_delete frees dev */ | |||
| 468 | tower_delete (dev); | |||
| 0 | - | 469 | goto exit; | |
| 470 | } | |||
| 471 | ||||
| 472 | /* wait until write transfer is finished */ | |||
| 0 | 0 | - | 473 | if (dev->interrupt_out_busy) { |
| 474 | wait_event_interruptible_timeout (dev->write_wait, !dev->interrupt_out_busy, 2 * HZ); | |||
| 475 | } | |||
| 476 | tower_abort_transfers (dev); | |||
| 477 | dev->open_count = 0; | |||
| 478 | ||||
| 479 | unlock_exit: | |||
| 480 | up (&dev->sem); | |||
| 481 | ||||
| 482 | exit: | |||
| 483 | dbg(2, "%s: leave, return value %d", __FUNCTION__, retval); | |||
| 0 | 0 | - | 483 | if (debug >= 2) |
| 0 | 0 | - | 483 | do-while (0) |
| 0 | - | 484 | return retval; | |
| 485 | } | |||
| 486 | ||||
| 487 | ||||
| 488 | /** | |||
| 489 | * tower_abort_transfers | |||
| 490 | * aborts transfers and frees associated data structures | |||
| 491 | */ | |||
| 0 | 0 | - | 492 | static void tower_abort_transfers (struct lego_usb_tower *dev) |
| 493 | { | |||
| 494 | dbg(2, "%s: enter", __FUNCTION__); | |||
| 0 | 0 | - | 494 | if (debug >= 2) |
| 0 | 0 | - | 494 | do-while (0) |
| 495 | ||||
| 0 | 0 | - | 496 | if (dev == NULL) { |
| 497 | dbg(1, "%s: dev is null", __FUNCTION__); | |||
| 0 | 0 | - | 497 | if (debug >= 1) |
| 0 | 0 | - | 497 | do-while (0) |
| 0 | - | 498 | goto exit; | |
| 499 | } | |||
| 500 | ||||
| 501 | /* shutdown transfer */ | |||
| 0 | 0 | - | 502 | if (dev->interrupt_in_running) { |
| 503 | dev->interrupt_in_running = 0; | |||
| 504 | mb(); | |||
| 0 | 0 | - | 505 | if (dev->interrupt_in_urb != NULL && dev->udev) { |
| 0 | - | 505 | T && T | |
| 0 | - | 505 | T && F | |
| 0 | - | 505 | F && _ | |
| 506 | usb_kill_urb (dev->interrupt_in_urb); | |||
| 507 | } | |||
| 508 | } | |||
| 0 | 0 | - | 509 | if (dev->interrupt_out_busy) { |
| 0 | 0 | - | 510 | if (dev->interrupt_out_urb != NULL && dev->udev) { |
| 0 | - | 510 | T && T | |
| 0 | - | 510 | T && F | |
| 0 | - | 510 | F && _ | |
| 511 | usb_kill_urb (dev->interrupt_out_urb); | |||
| 512 | } | |||
| 513 | } | |||
| 514 | ||||
| 515 | exit: | |||
| 516 | dbg(2, "%s: leave", __FUNCTION__); | |||
| 0 | 0 | - | 516 | if (debug >= 2) |
| 0 | 0 | - | 516 | do-while (0) |
| 517 | } | |||
| 518 | ||||
| 519 | ||||
| 520 | /** | |||
| 521 | * tower_check_for_read_packet | |||
| &nbs | ||||