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annotate dmx_usb_module/dmx_usb.c @ 695:0b8fc64a896c
goocanvas drawing a little
Ignore-this: aae191151f454a98caa671b65d080029
| author | Drew Perttula <drewp@bigasterisk.com> |
|---|---|
| date | Fri, 08 Jun 2012 07:54:32 +0000 |
| parents | 7d59926031ba |
| children | 01d330152a18 |
| rev | line source |
|---|---|
| 355 | 1 /* |
| 2 * DMX USB driver | |
| 3 * | |
| 4 * Copyright (C) 2004,2006 Erwin Rol (erwin@erwinrol.com) | |
| 5 * | |
| 6 * This driver is based on the usb-skeleton driver; | |
| 7 * | |
| 8 * Copyright (C) 2001-2003 Greg Kroah-Hartman (greg@kroah.com) | |
| 9 * | |
| 10 * This program is free software; you can redistribute it and/or | |
| 11 * modify it under the terms of the GNU General Public License as | |
| 12 * published by the Free Software Foundation, version 2. | |
| 13 * | |
| 14 * $Id: dmx_usb.c 41 2004-09-14 23:35:25Z erwin $ | |
| 15 */ | |
| 16 | |
| 17 #include <linux/kernel.h> | |
| 18 #include <linux/errno.h> | |
| 19 #include <linux/init.h> | |
| 20 #include <linux/slab.h> | |
| 21 #include <linux/module.h> | |
| 22 #include <linux/smp_lock.h> | |
| 23 #include <linux/completion.h> | |
| 24 #include <asm/uaccess.h> | |
| 25 #include <linux/usb.h> | |
| 26 #include <linux/version.h> | |
| 27 | |
| 28 #include "dmx_usb.h" | |
| 29 | |
| 30 #ifdef CONFIG_USB_DEBUG | |
| 31 static int debug = 1; | |
| 32 #else | |
| 33 static int debug; | |
| 34 #endif | |
| 35 | |
| 36 /* Use our own dbg macro */ | |
| 37 #undef dbg | |
| 38 #define dbg(format, arg...) do { if (debug) printk(KERN_DEBUG __FILE__ ": " format "\n" , ## arg); } while (0) | |
| 39 | |
| 40 | |
|
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41 // from http://www.linuxinsight.com/vmware-workstation-7.1.3-runs-great-on-linux-kernel-2.6.37.html |
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42 #if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 37) |
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43 #define DECLARE_MUTEX(_m) DEFINE_SEMAPHORE(_m) |
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44 #define init_MUTEX(_m) sema_init(_m, 1) |
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45 #endif |
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46 |
| 355 | 47 /* Version Information */ |
| 48 #define DRIVER_VERSION "v0.1.20060816" | |
| 49 #define DRIVER_AUTHOR "Erwin Rol, erwin@erwinrol.com" | |
| 50 #define DRIVER_DESC "DMX USB Driver" | |
| 51 | |
| 52 /* Module parameters */ | |
| 53 #if ( LINUX_VERSION_CODE < KERNEL_VERSION(2,6,16) ) | |
| 54 MODULE_PARM(debug, "i"); | |
| 55 MODULE_PARM_DESC(debug, "Debug enabled or not"); | |
| 56 #else | |
| 57 module_param(debug, bool, S_IRUGO | S_IWUSR); | |
| 58 MODULE_PARM_DESC(debug, "Debug enabled or not"); | |
| 59 #endif | |
| 60 | |
| 61 static struct usb_device_id dmx_usb_table [] = { | |
| 62 { USB_DEVICE_VER(FTDI_VID, FTDI_8U232AM_PID, 0x400, 0xffff) }, | |
| 63 { USB_DEVICE_VER(FTDI_VID, FTDI_8U232AM_ALT_PID, 0x400, 0xffff) }, | |
| 64 { } /* Terminating entry */ | |
| 65 }; | |
| 66 | |
| 67 MODULE_DEVICE_TABLE (usb, dmx_usb_table); | |
| 68 | |
| 69 /* Get a minor range for your devices from the usb maintainer */ | |
| 70 #define DMX_USB_MINOR_BASE 192 | |
| 71 | |
| 72 /* Structure to hold all of our device specific stuff */ | |
| 73 struct dmx_usb_device { | |
| 74 struct usb_device * udev; /* save off the usb device pointer */ | |
| 75 struct usb_interface * interface; /* the interface for this device */ | |
| 76 unsigned char minor; /* the starting minor number for this device */ | |
| 77 unsigned char num_ports; /* the number of ports this device has */ | |
| 78 char num_interrupt_in; /* number of interrupt in endpoints we have */ | |
| 79 char num_bulk_in; /* number of bulk in endpoints we have */ | |
| 80 char num_bulk_out; /* number of bulk out endpoints we have */ | |
| 81 | |
| 82 unsigned char * bulk_in_buffer; /* the buffer to receive data */ | |
| 83 size_t bulk_in_size; /* the size of the receive buffer */ | |
| 84 __u8 bulk_in_endpointAddr; /* the address of the bulk in endpoint */ | |
| 85 | |
| 86 unsigned char * bulk_out_buffer; /* the buffer to send data */ | |
| 87 size_t bulk_out_size; /* the size of the send buffer */ | |
| 88 struct urb * write_urb; /* the urb used to send data */ | |
| 89 __u8 bulk_out_endpointAddr; /* the address of the bulk out endpoint */ | |
| 90 atomic_t write_busy; /* true iff write urb is busy */ | |
| 91 struct completion write_finished; /* wait for the write to finish */ | |
| 92 | |
| 93 int open; /* if the port is open or not */ | |
| 94 int present; /* if the device is not disconnected */ | |
| 95 struct semaphore sem; /* locks this structure */ | |
| 96 }; | |
| 97 | |
| 98 | |
| 99 /* prevent races between open() and disconnect() */ | |
| 100 static DECLARE_MUTEX (disconnect_sem); | |
| 101 | |
| 102 /* local function prototypes */ | |
| 103 //static ssize_t dmx_usb_read (struct file *file, char *buffer, size_t count, loff_t *ppos); | |
| 104 static ssize_t dmx_usb_write (struct file *file, const char *buffer, size_t count, loff_t *ppos); | |
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attempted fixes to dmx_usb kernel module for 2.6.38. untested; may crash you
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parents:
633
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changeset
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105 static int dmx_usb_ioctl (struct file *file, unsigned int cmd, unsigned long arg); |
| 355 | 106 static int dmx_usb_open (struct inode *inode, struct file *file); |
| 107 static int dmx_usb_release (struct inode *inode, struct file *file); | |
| 108 | |
| 109 static int dmx_usb_probe (struct usb_interface *interface, const struct usb_device_id *id); | |
| 110 static void dmx_usb_disconnect (struct usb_interface *interface); | |
| 111 | |
| 112 static void dmx_usb_write_bulk_callback (struct urb *urb, struct pt_regs *regs); | |
| 113 | |
| 114 static struct file_operations dmx_usb_fops = { | |
| 115 /* | |
| 116 * The owner field is part of the module-locking | |
| 117 * mechanism. The idea is that the kernel knows | |
| 118 * which module to increment the use-counter of | |
| 119 * BEFORE it calls the device's open() function. | |
| 120 * This also means that the kernel can decrement | |
| 121 * the use-counter again before calling release() | |
| 122 * or should the open() function fail. | |
| 123 */ | |
| 124 .owner = THIS_MODULE, | |
| 125 | |
| 126 /* .read = dmx_usb_read, */ | |
| 127 .write = dmx_usb_write, | |
|
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attempted fixes to dmx_usb kernel module for 2.6.38. untested; may crash you
drewp@bigasterisk.com
parents:
633
diff
changeset
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128 .unlocked_ioctl = dmx_usb_ioctl, |
| 355 | 129 .open = dmx_usb_open, |
| 130 .release = dmx_usb_release, | |
| 131 }; | |
| 132 | |
| 133 /* | |
| 134 * usb class driver info in order to get a minor number from the usb core, | |
| 135 * and to have the device registered with devfs and the driver core | |
| 136 */ | |
| 137 static struct usb_class_driver dmx_usb_class = { | |
| 138 .name = "usb/dmx%d", | |
| 139 .fops = &dmx_usb_fops, | |
| 140 .minor_base = DMX_USB_MINOR_BASE, | |
| 141 }; | |
| 142 | |
| 143 /* usb specific object needed to register this driver with the usb subsystem */ | |
| 144 static struct usb_driver dmx_usb_driver = { | |
| 145 #if ( LINUX_VERSION_CODE < KERNEL_VERSION(2,6,16) ) | |
| 146 .owner = THIS_MODULE, | |
| 147 #endif | |
| 148 .name = "dmx_usb", | |
| 149 .probe = dmx_usb_probe, | |
| 150 .disconnect = dmx_usb_disconnect, | |
| 151 .id_table = dmx_usb_table, | |
| 152 }; | |
| 153 | |
| 154 | |
| 155 /** | |
| 156 */ | |
| 157 static inline void dmx_usb_debug_data (const char *function, int size, const unsigned char *data) | |
| 158 { | |
| 159 int i; | |
| 160 | |
| 161 if (!debug) | |
| 162 return; | |
| 163 | |
| 164 printk (KERN_DEBUG __FILE__": %s - length = %d, data = ", | |
| 165 function, size); | |
| 166 for (i = 0; i < size; ++i) { | |
| 167 printk ("%.2x ", data[i]); | |
| 168 } | |
| 169 printk ("\n"); | |
| 170 } | |
| 171 | |
| 172 static __u32 dmx_usb_baud_to_divisor(int baud) | |
| 173 { | |
| 174 static const unsigned char divfrac[8] = { 0, 3, 2, 4, 1, 5, 6, 7 }; | |
| 175 __u32 divisor; | |
| 176 int divisor3 = 48000000 / 2 / baud; // divisor shifted 3 bits to the left | |
| 177 divisor = divisor3 >> 3; | |
| 178 divisor |= (__u32)divfrac[divisor3 & 0x7] << 14; | |
| 179 /* Deal with special cases for highest baud rates. */ | |
| 180 if (divisor == 1) divisor = 0; else // 1.0 | |
| 181 if (divisor == 0x4001) divisor = 1; // 1.5 | |
| 182 return divisor; | |
| 183 } | |
| 184 | |
| 185 static int dmx_usb_set_speed(struct dmx_usb_device* dev) | |
| 186 { | |
| 187 char *buf; | |
| 188 __u16 urb_value; | |
| 189 __u16 urb_index; | |
| 190 __u32 urb_index_value; | |
| 191 int rv; | |
| 192 | |
| 193 buf = kmalloc(1, GFP_NOIO); | |
| 194 if (!buf) | |
| 195 return -ENOMEM; | |
| 196 | |
| 197 urb_index_value = dmx_usb_baud_to_divisor(250000); | |
| 198 urb_value = (__u16)urb_index_value; | |
| 199 urb_index = (__u16)(urb_index_value >> 16); | |
| 200 | |
| 201 rv = usb_control_msg(dev->udev, | |
| 202 usb_sndctrlpipe(dev->udev, 0), | |
| 203 FTDI_SIO_SET_BAUDRATE_REQUEST, | |
| 204 FTDI_SIO_SET_BAUDRATE_REQUEST_TYPE, | |
| 205 urb_value, urb_index, | |
| 206 buf, 0, HZ*10); | |
| 207 | |
| 208 kfree(buf); | |
| 209 return rv; | |
| 210 } | |
| 211 | |
| 212 static int dmx_usb_setup(struct dmx_usb_device* dev) | |
| 213 { | |
| 214 __u16 urb_value; | |
| 215 char buf[1]; | |
| 216 | |
| 217 urb_value = FTDI_SIO_SET_DATA_STOP_BITS_2 | FTDI_SIO_SET_DATA_PARITY_NONE; | |
| 218 urb_value |= 8; // number of data bits | |
| 219 | |
| 220 if (usb_control_msg(dev->udev, usb_sndctrlpipe(dev->udev, 0), | |
| 221 FTDI_SIO_SET_DATA_REQUEST, | |
| 222 FTDI_SIO_SET_DATA_REQUEST_TYPE, | |
| 223 urb_value , 0, | |
| 224 buf, 0, HZ*10) < 0) { | |
| 225 err("%s FAILED to set databits/stopbits/parity", __FUNCTION__); | |
| 226 } | |
| 227 | |
| 228 if (usb_control_msg(dev->udev, usb_sndctrlpipe(dev->udev, 0), | |
| 229 FTDI_SIO_SET_FLOW_CTRL_REQUEST, | |
| 230 FTDI_SIO_SET_FLOW_CTRL_REQUEST_TYPE, | |
| 231 0, 0, | |
| 232 buf, 0, HZ*10) < 0) { | |
| 233 err("%s error from disable flowcontrol urb", __FUNCTION__); | |
| 234 } | |
| 235 | |
| 236 dmx_usb_set_speed(dev); | |
| 237 | |
| 238 return 0; | |
| 239 } | |
| 240 | |
| 241 static void dmx_usb_set_break(struct dmx_usb_device* dev, int break_state) | |
| 242 { | |
| 243 __u16 urb_value = FTDI_SIO_SET_DATA_STOP_BITS_2 | FTDI_SIO_SET_DATA_PARITY_NONE | 8; | |
| 244 | |
| 245 char buf[2]; | |
| 246 | |
| 247 if (break_state) { | |
| 248 urb_value |= FTDI_SIO_SET_BREAK; | |
| 249 } | |
| 250 | |
| 251 if (usb_control_msg(dev->udev, usb_sndctrlpipe(dev->udev, 0), | |
| 252 FTDI_SIO_SET_DATA_REQUEST, | |
| 253 FTDI_SIO_SET_DATA_REQUEST_TYPE, | |
| 254 urb_value , 0, | |
| 255 buf, 2, HZ*10) < 0) { | |
| 256 err("%s FAILED to enable/disable break state (state was %d)", __FUNCTION__,break_state); | |
| 257 } | |
| 258 | |
| 259 | |
| 260 dbg("%s break state is %d - urb is %d", __FUNCTION__,break_state, urb_value); | |
| 261 } | |
| 262 | |
| 263 /** | |
| 264 */ | |
| 265 static inline void dmx_usb_delete (struct dmx_usb_device *dev) | |
| 266 { | |
| 267 kfree (dev->bulk_in_buffer); | |
|
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268 usb_free_coherent (dev->udev, dev->bulk_out_size, |
| 355 | 269 dev->bulk_out_buffer, |
| 270 dev->write_urb->transfer_dma); | |
| 271 usb_free_urb (dev->write_urb); | |
| 272 kfree (dev); | |
| 273 } | |
| 274 | |
| 275 | |
| 276 /** | |
| 277 */ | |
| 278 static int dmx_usb_open (struct inode *inode, struct file *file) | |
| 279 { | |
| 280 struct dmx_usb_device *dev = NULL; | |
| 281 struct usb_interface *interface; | |
| 282 int subminor; | |
| 283 int retval = 0; | |
| 284 | |
| 285 dbg("%s", __FUNCTION__); | |
| 286 | |
| 287 subminor = iminor(inode); | |
| 288 | |
| 289 /* prevent disconnects */ | |
| 290 down (&disconnect_sem); | |
| 291 | |
| 292 interface = usb_find_interface (&dmx_usb_driver, subminor); | |
| 293 if (!interface) { | |
| 294 err ("%s - error, can't find device for minor %d", | |
| 295 __FUNCTION__, subminor); | |
| 296 retval = -ENODEV; | |
| 297 goto exit_no_device; | |
| 298 } | |
| 299 | |
| 300 dev = usb_get_intfdata(interface); | |
| 301 if (!dev) { | |
| 302 retval = -ENODEV; | |
| 303 goto exit_no_device; | |
| 304 } | |
| 305 | |
| 306 /* lock this device */ | |
| 307 down (&dev->sem); | |
| 308 | |
| 309 /* increment our usage count for the driver */ | |
| 310 ++dev->open; | |
| 311 | |
| 312 /* save our object in the file's private structure */ | |
| 313 file->private_data = dev; | |
| 314 | |
| 315 /* unlock this device */ | |
| 316 up (&dev->sem); | |
| 317 | |
| 318 exit_no_device: | |
| 319 up (&disconnect_sem); | |
| 320 return retval; | |
| 321 } | |
| 322 | |
| 323 | |
| 324 /** | |
| 325 */ | |
| 326 static int dmx_usb_release (struct inode *inode, struct file *file) | |
| 327 { | |
| 328 struct dmx_usb_device *dev; | |
| 329 int retval = 0; | |
| 330 | |
| 331 dev = (struct dmx_usb_device *)file->private_data; | |
| 332 if (dev == NULL) { | |
| 333 dbg ("%s - object is NULL", __FUNCTION__); | |
| 334 return -ENODEV; | |
| 335 } | |
| 336 | |
| 337 dbg("%s - minor %d", __FUNCTION__, dev->minor); | |
| 338 | |
| 339 /* lock our device */ | |
| 340 down (&dev->sem); | |
| 341 | |
| 342 if (dev->open <= 0) { | |
| 343 dbg ("%s - device not opened", __FUNCTION__); | |
| 344 retval = -ENODEV; | |
| 345 goto exit_not_opened; | |
| 346 } | |
| 347 | |
| 348 /* wait for any bulk writes that might be going on to finish up */ | |
| 349 if (atomic_read (&dev->write_busy)) | |
| 350 wait_for_completion (&dev->write_finished); | |
| 351 | |
| 352 --dev->open; | |
| 353 | |
| 354 if (!dev->present && !dev->open) { | |
| 355 /* the device was unplugged before the file was released */ | |
| 356 up (&dev->sem); | |
| 357 dmx_usb_delete (dev); | |
| 358 return 0; | |
| 359 } | |
| 360 | |
| 361 exit_not_opened: | |
| 362 up (&dev->sem); | |
| 363 | |
| 364 return retval; | |
| 365 } | |
| 366 | |
| 367 #if 0 | |
| 368 | |
| 369 Read is not yet supported | |
| 370 | |
| 371 /** | |
| 372 */ | |
| 373 static ssize_t dmx_usb_read (struct file *file, char *buffer, size_t count, loff_t *ppos) | |
| 374 { | |
| 375 struct dmx_usb_device *dev; | |
| 376 int retval = 0; | |
| 377 int bytes_read; | |
| 378 | |
| 379 dev = (struct dmx_usb_device *)file->private_data; | |
| 380 | |
| 381 dbg("%s - minor %d, count = %Zd", __FUNCTION__, dev->minor, count); | |
| 382 | |
| 383 /* lock this object */ | |
| 384 down (&dev->sem); | |
| 385 | |
| 386 /* verify that the device wasn't unplugged */ | |
| 387 if (!dev->present) { | |
| 388 up (&dev->sem); | |
| 389 return -ENODEV; | |
| 390 } | |
| 391 | |
| 392 /* do a blocking bulk read to get data from the device */ | |
| 393 retval = usb_bulk_msg (dev->udev, | |
| 394 usb_rcvbulkpipe (dev->udev, | |
| 395 dev->bulk_in_endpointAddr), | |
| 396 dev->bulk_in_buffer, | |
| 397 min (dev->bulk_in_size, count), | |
| 398 &bytes_read, HZ*10); | |
| 399 | |
| 400 /* if the read was successful, copy the data to userspace */ | |
| 401 if (!retval) { | |
| 402 if (copy_to_user (buffer, dev->bulk_in_buffer+2, bytes_read-2)) | |
| 403 retval = -EFAULT; | |
| 404 else | |
| 405 retval = bytes_read; | |
| 406 } | |
| 407 | |
| 408 /* unlock the device */ | |
| 409 up (&dev->sem); | |
| 410 return retval; | |
| 411 } | |
| 412 | |
| 413 #endif | |
| 414 | |
| 415 static __u16 dmx_usb_get_status(struct dmx_usb_device* dev) | |
| 416 { | |
| 417 int retval = 0; | |
| 418 int count = 0; | |
| 419 __u16 buf; | |
| 420 | |
| 421 retval = usb_bulk_msg (dev->udev, | |
| 422 usb_rcvbulkpipe (dev->udev, dev->bulk_in_endpointAddr), | |
| 423 &buf, 2, &count, HZ*10); | |
| 424 | |
| 425 if (retval) | |
| 426 return 0; | |
| 427 | |
| 428 return buf; | |
| 429 } | |
| 430 | |
| 431 | |
| 432 | |
| 433 /** | |
| 434 * dmx_usb_write | |
| 435 * | |
| 436 * A device driver has to decide how to report I/O errors back to the | |
| 437 * user. The safest course is to wait for the transfer to finish before | |
| 438 * returning so that any errors will be reported reliably. dmx_usb_read() | |
| 439 * works like this. But waiting for I/O is slow, so many drivers only | |
| 440 * check for errors during I/O initiation and do not report problems | |
| 441 * that occur during the actual transfer. That's what we will do here. | |
| 442 * | |
| 443 * A driver concerned with maximum I/O throughput would use double- | |
| 444 * buffering: Two urbs would be devoted to write transfers, so that | |
| 445 * one urb could always be active while the other was waiting for the | |
| 446 * user to send more data. | |
| 447 */ | |
| 448 static ssize_t dmx_usb_write (struct file *file, const char *buffer, size_t count, loff_t *ppos) | |
| 449 { | |
| 450 struct dmx_usb_device *dev; | |
| 451 ssize_t bytes_written = 0; | |
| 452 int retval = 0; | |
| 453 __u16 stat; | |
| 454 | |
| 455 dev = (struct dmx_usb_device *)file->private_data; | |
| 456 | |
| 457 dbg("%s - minor %d, count = %Zd", __FUNCTION__, dev->minor, count); | |
| 458 | |
| 459 /* lock this object */ | |
| 460 down (&dev->sem); | |
| 461 | |
| 462 /* verify that the device wasn't unplugged */ | |
| 463 if (!dev->present) { | |
| 464 retval = -ENODEV; | |
| 465 goto exit; | |
| 466 } | |
| 467 | |
| 468 /* verify that we actually have some data to write */ | |
| 469 if (count == 0) { | |
| 470 dbg("%s - write request of 0 bytes", __FUNCTION__); | |
| 471 goto exit; | |
| 472 } | |
| 473 | |
| 474 /* wait for a previous write to finish up; we don't use a timeout | |
| 475 * and so a nonresponsive device can delay us indefinitely. | |
| 476 */ | |
| 477 if (atomic_read (&dev->write_busy)) | |
| 478 wait_for_completion (&dev->write_finished); | |
| 479 | |
| 480 /* we can only write as much as our buffer will hold */ | |
| 481 bytes_written = min (dev->bulk_out_size, count); | |
| 482 | |
| 483 /* copy the data from userspace into our transfer buffer; | |
| 484 * this is the only copy required. | |
| 485 */ | |
| 486 if (copy_from_user(dev->write_urb->transfer_buffer, buffer, | |
| 487 bytes_written)) { | |
| 488 retval = -EFAULT; | |
| 489 goto exit; | |
| 490 } | |
| 491 | |
| 492 dmx_usb_debug_data (__FUNCTION__, bytes_written, | |
| 493 dev->write_urb->transfer_buffer); | |
| 494 | |
| 495 /* this urb was already set up, except for this write size */ | |
| 496 dev->write_urb->transfer_buffer_length = bytes_written; | |
| 497 | |
| 498 /* Poll the device to see if the transmit buffer is empty */ | |
| 499 do { | |
| 500 stat = dmx_usb_get_status(dev); | |
| 501 if (stat == 0) { | |
| 502 retval = -EFAULT; | |
| 503 goto exit; | |
| 504 } | |
| 505 } while ( (stat & ((FTDI_RS_TEMT) << 8) ) == 0 ) ; | |
| 506 | |
| 507 /* the transmit buffer is empty, now toggle the break */ | |
| 508 dmx_usb_set_break(dev, 1); | |
| 509 dmx_usb_set_break(dev, 0); | |
| 510 | |
| 511 /* send the data out the bulk port */ | |
| 512 /* a character device write uses GFP_KERNEL, | |
| 513 unless a spinlock is held */ | |
| 514 init_completion (&dev->write_finished); | |
| 515 atomic_set (&dev->write_busy, 1); | |
| 516 retval = usb_submit_urb(dev->write_urb, GFP_KERNEL); | |
| 517 if (retval) { | |
| 518 atomic_set (&dev->write_busy, 0); | |
| 519 err("%s - failed submitting write urb, error %d", | |
| 520 __FUNCTION__, retval); | |
| 521 } else { | |
| 522 retval = bytes_written; | |
| 523 } | |
| 524 | |
| 525 exit: | |
| 526 /* unlock the device */ | |
| 527 up (&dev->sem); | |
| 528 | |
| 529 return retval; | |
| 530 } | |
| 531 | |
| 532 | |
| 533 /** | |
| 534 */ | |
|
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535 static int dmx_usb_ioctl (struct file *file, unsigned int cmd, unsigned long arg) |
| 355 | 536 { |
| 537 struct dmx_usb_device *dev; | |
| 538 | |
|
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539 lock_kernel(); // this was originally getting the Big Kernel |
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540 // Lock. I don't know if that was needed, but I don't want to |
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541 // destabilize anything as I move to unlocked_ioctl |
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542 |
| 355 | 543 dev = (struct dmx_usb_device *)file->private_data; |
| 544 | |
| 545 /* lock this object */ | |
| 546 down (&dev->sem); | |
| 547 | |
| 548 /* verify that the device wasn't unplugged */ | |
| 549 if (!dev->present) { | |
| 550 up (&dev->sem); | |
|
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551 unlock_kernel(); |
| 355 | 552 return -ENODEV; |
| 553 } | |
| 554 | |
| 555 dbg("%s - minor %d, cmd 0x%.4x, arg %ld", __FUNCTION__, | |
| 556 dev->minor, cmd, arg); | |
| 557 | |
| 558 /* fill in your device specific stuff here */ | |
| 559 | |
| 560 /* unlock the device */ | |
| 561 up (&dev->sem); | |
| 562 | |
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563 unlock_kernel(); |
| 355 | 564 /* return that we did not understand this ioctl call */ |
| 565 return -ENOTTY; | |
| 566 } | |
| 567 | |
| 568 | |
| 569 /** | |
| 570 */ | |
| 571 static void dmx_usb_write_bulk_callback (struct urb *urb, struct pt_regs *regs) | |
| 572 { | |
| 573 struct dmx_usb_device *dev = (struct dmx_usb_device *)urb->context; | |
| 574 | |
| 575 dbg("%s - minor %d", __FUNCTION__, dev->minor); | |
| 576 | |
| 577 /* sync/async unlink faults aren't errors */ | |
| 578 if (urb->status && !(urb->status == -ENOENT || | |
| 579 urb->status == -ECONNRESET)) { | |
| 580 dbg("%s - nonzero write bulk status received: %d", | |
| 581 __FUNCTION__, urb->status); | |
| 582 } | |
| 583 | |
| 584 /* notify anyone waiting that the write has finished */ | |
| 585 atomic_set (&dev->write_busy, 0); | |
| 586 complete (&dev->write_finished); | |
| 587 } | |
| 588 | |
| 589 /** | |
| 590 * | |
| 591 * Called by the usb core when a new device is connected that it thinks | |
| 592 * this driver might be interested in. | |
| 593 */ | |
| 594 static int dmx_usb_probe(struct usb_interface *interface, const struct usb_device_id *id) | |
| 595 { | |
| 596 struct usb_device *udev = interface_to_usbdev(interface); | |
| 597 struct dmx_usb_device *dev = NULL; | |
| 598 struct usb_host_interface *iface_desc; | |
| 599 struct usb_endpoint_descriptor *endpoint; | |
| 600 size_t buffer_size; | |
| 601 int i; | |
| 602 int retval = -ENOMEM; | |
| 603 | |
| 604 /* See if the device offered us matches what we can accept */ | |
| 605 if ((udev->descriptor.idVendor != FTDI_VID) || | |
| 606 (udev->descriptor.idProduct != FTDI_8U232AM_PID)) { | |
| 607 return -ENODEV; | |
| 608 } | |
| 609 | |
| 610 /* allocate memory for our device state and initialize it */ | |
| 611 dev = kmalloc (sizeof(struct dmx_usb_device), GFP_KERNEL); | |
| 612 if (dev == NULL) { | |
| 613 err ("Out of memory"); | |
| 614 return -ENOMEM; | |
| 615 } | |
| 616 memset (dev, 0x00, sizeof (*dev)); | |
| 617 | |
| 618 init_MUTEX (&dev->sem); | |
| 619 dev->udev = udev; | |
| 620 dev->interface = interface; | |
| 621 | |
| 622 /* set up the endpoint information */ | |
| 623 /* check out the endpoints */ | |
| 624 /* use only the first bulk-in and bulk-out endpoints */ | |
| 625 iface_desc = &interface->altsetting[0]; | |
| 626 for (i = 0; i < iface_desc->desc.bNumEndpoints; ++i) { | |
| 627 endpoint = &iface_desc->endpoint[i].desc; | |
| 628 | |
| 629 if (!dev->bulk_in_endpointAddr && | |
| 630 (endpoint->bEndpointAddress & USB_DIR_IN) && | |
| 631 ((endpoint->bmAttributes & USB_ENDPOINT_XFERTYPE_MASK) | |
| 632 == USB_ENDPOINT_XFER_BULK)) { | |
| 633 /* we found a bulk in endpoint */ | |
| 634 buffer_size = endpoint->wMaxPacketSize; | |
| 635 dev->bulk_in_size = buffer_size; | |
| 636 dev->bulk_in_endpointAddr = endpoint->bEndpointAddress; | |
| 637 dev->bulk_in_buffer = kmalloc (buffer_size, GFP_KERNEL); | |
| 638 if (!dev->bulk_in_buffer) { | |
| 639 err("Couldn't allocate bulk_in_buffer"); | |
| 640 goto error; | |
| 641 } | |
| 642 } | |
| 643 | |
| 644 if (!dev->bulk_out_endpointAddr && | |
| 645 !(endpoint->bEndpointAddress & USB_DIR_IN) && | |
| 646 ((endpoint->bmAttributes & USB_ENDPOINT_XFERTYPE_MASK) | |
| 647 == USB_ENDPOINT_XFER_BULK)) { | |
| 648 /* we found a bulk out endpoint */ | |
| 649 /* a probe() may sleep and has no restrictions on memory allocations */ | |
| 650 dev->write_urb = usb_alloc_urb(0, GFP_KERNEL); | |
| 651 if (!dev->write_urb) { | |
| 652 err("No free urbs available"); | |
| 653 goto error; | |
| 654 } | |
| 655 dev->bulk_out_endpointAddr = endpoint->bEndpointAddress; | |
| 656 | |
| 657 /* on some platforms using this kind of buffer alloc | |
| 658 * call eliminates a dma "bounce buffer". | |
| 659 * | |
| 660 * NOTE: you'd normally want i/o buffers that hold | |
| 661 * more than one packet, so that i/o delays between | |
| 662 * packets don't hurt throughput. | |
| 663 */ | |
| 664 buffer_size = endpoint->wMaxPacketSize; | |
| 665 dev->bulk_out_size = 513; | |
| 666 dev->write_urb->transfer_flags = URB_NO_TRANSFER_DMA_MAP; | |
|
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667 dev->bulk_out_buffer = usb_alloc_coherent (udev, |
| 355 | 668 buffer_size, GFP_KERNEL, |
| 669 &dev->write_urb->transfer_dma); | |
| 670 if (!dev->bulk_out_buffer) { | |
| 671 err("Couldn't allocate bulk_out_buffer"); | |
| 672 goto error; | |
| 673 } | |
| 674 usb_fill_bulk_urb(dev->write_urb, udev, | |
| 675 usb_sndbulkpipe(udev, | |
| 676 endpoint->bEndpointAddress), | |
| 677 dev->bulk_out_buffer, buffer_size, | |
| 678 dmx_usb_write_bulk_callback, dev); | |
| 679 } | |
| 680 } | |
| 681 if (!(dev->bulk_in_endpointAddr && dev->bulk_out_endpointAddr)) { | |
| 682 err("Couldn't find both bulk-in and bulk-out endpoints"); | |
| 683 goto error; | |
| 684 } | |
| 685 | |
| 686 dmx_usb_setup(dev); | |
| 687 | |
| 688 /* allow device read, write and ioctl */ | |
| 689 dev->present = 1; | |
| 690 | |
| 691 /* we can register the device now, as it is ready */ | |
| 692 usb_set_intfdata (interface, dev); | |
| 693 retval = usb_register_dev (interface, &dmx_usb_class); | |
| 694 if (retval) { | |
| 695 /* something prevented us from registering this driver */ | |
| 696 err ("Not able to get a minor for this device."); | |
| 697 usb_set_intfdata (interface, NULL); | |
| 698 goto error; | |
| 699 } | |
| 700 | |
| 701 dev->minor = interface->minor; | |
| 702 | |
| 703 /* let the user know what node this device is now attached to */ | |
|
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diff
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704 err ("info: DMX USB device now attached to dmx%d", dev->minor); |
| 355 | 705 return 0; |
| 706 | |
| 707 error: | |
| 708 dmx_usb_delete (dev); | |
| 709 return retval; | |
| 710 } | |
| 711 | |
| 712 | |
| 713 /** | |
| 714 * | |
| 715 * Called by the usb core when the device is removed from the system. | |
| 716 * | |
| 717 * This routine guarantees that the driver will not submit any more urbs | |
| 718 * by clearing dev->udev. It is also supposed to terminate any currently | |
| 719 * active urbs. Unfortunately, usb_bulk_msg(), used in dmx_usb_read(), does | |
| 720 * not provide any way to do this. But at least we can cancel an active | |
| 721 * write. | |
| 722 */ | |
| 723 static void dmx_usb_disconnect(struct usb_interface *interface) | |
| 724 { | |
| 725 struct dmx_usb_device *dev; | |
| 726 int minor; | |
| 727 | |
| 728 /* prevent races with open() */ | |
| 729 down (&disconnect_sem); | |
| 730 | |
| 731 dev = usb_get_intfdata (interface); | |
| 732 usb_set_intfdata (interface, NULL); | |
| 733 | |
| 734 down (&dev->sem); | |
| 735 | |
| 736 minor = dev->minor; | |
| 737 | |
| 738 /* give back our minor */ | |
| 739 usb_deregister_dev (interface, &dmx_usb_class); | |
| 740 | |
| 741 /* terminate an ongoing write */ | |
| 742 if (atomic_read (&dev->write_busy)) { | |
| 743 usb_unlink_urb (dev->write_urb); | |
| 744 wait_for_completion (&dev->write_finished); | |
| 745 } | |
| 746 | |
| 747 /* prevent device read, write and ioctl */ | |
| 748 dev->present = 0; | |
| 749 | |
| 750 up (&dev->sem); | |
| 751 | |
| 752 /* if the device is opened, dmx_usb_release will clean this up */ | |
| 753 if (!dev->open) | |
| 754 dmx_usb_delete (dev); | |
| 755 | |
| 756 up (&disconnect_sem); | |
| 757 | |
|
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diff
changeset
|
758 err("info: DMX USB #%d now disconnected", minor); |
| 355 | 759 } |
| 760 | |
| 761 | |
| 762 | |
| 763 /** | |
| 764 * dmx_usb_init | |
| 765 */ | |
| 766 static int __init dmx_usb_init(void) | |
| 767 { | |
| 768 int result; | |
| 769 | |
| 770 /* register this driver with the USB subsystem */ | |
| 771 result = usb_register(&dmx_usb_driver); | |
| 772 if (result) { | |
| 773 err("usb_register failed. Error number %d", | |
| 774 result); | |
| 775 return result; | |
| 776 } | |
| 777 | |
|
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|
778 err("info: " DRIVER_DESC " " DRIVER_VERSION); |
| 355 | 779 return 0; |
| 780 } | |
| 781 | |
| 782 | |
| 783 /** | |
| 784 * dmx_usb_exit | |
| 785 */ | |
| 786 static void __exit dmx_usb_exit(void) | |
| 787 { | |
| 788 /* deregister this driver with the USB subsystem */ | |
| 789 usb_deregister(&dmx_usb_driver); | |
| 790 } | |
| 791 | |
| 792 | |
| 793 module_init (dmx_usb_init); | |
| 794 module_exit (dmx_usb_exit); | |
| 795 | |
| 796 MODULE_AUTHOR(DRIVER_AUTHOR); | |
| 797 MODULE_DESCRIPTION(DRIVER_DESC); | |
| 798 MODULE_LICENSE("GPL"); | |
| 799 |