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annotate dmx_usb_module/dmx_usb.c @ 2125:80db402a302b
ignore pdm
| author | drewp@bigasterisk.com |
|---|---|
| date | Thu, 02 Jun 2022 23:35:37 -0700 |
| parents | f9aab7275d4e |
| children |
| rev | line source |
|---|---|
| 355 | 1 /* |
| 2 * DMX USB driver | |
| 3 * | |
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4 * Copyright (C) 2004,2006,2010 Erwin Rol (erwin@erwinrol.com) |
| 355 | 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 */ | |
| 15 | |
| 16 #include <linux/kernel.h> | |
| 17 #include <linux/errno.h> | |
| 18 #include <linux/init.h> | |
| 19 #include <linux/slab.h> | |
| 20 #include <linux/module.h> | |
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21 #include <linux/spinlock.h> |
| 355 | 22 #include <linux/completion.h> |
| 23 #include <asm/uaccess.h> | |
| 24 #include <linux/usb.h> | |
| 25 #include <linux/version.h> | |
| 26 | |
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27 #if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,26) |
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28 #include <linux/semaphore.h> |
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29 #else |
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30 #include <asm/semaphore.h> |
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31 #endif |
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32 |
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33 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2,6,36) ) |
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34 #define init_MUTEX(LOCKNAME) sema_init(LOCKNAME,1); |
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35 #endif |
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36 |
| 355 | 37 #include "dmx_usb.h" |
| 38 | |
| 39 #ifdef CONFIG_USB_DEBUG | |
| 40 static int debug = 1; | |
| 41 #else | |
| 42 static int debug; | |
| 43 #endif | |
| 44 | |
| 45 /* Use our own dbg macro */ | |
| 46 #undef dbg | |
| 47 #define dbg(format, arg...) do { if (debug) printk(KERN_DEBUG __FILE__ ": " format "\n" , ## arg); } while (0) | |
| 48 | |
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49 #ifndef info |
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50 #define info(format, arg...) do { printk(KERN_INFO __FILE__ ": " format "\n" , ## arg); } while (0) |
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51 #endif |
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52 |
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53 #ifndef err |
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54 #define err(format, arg...) do { printk(KERN_INFO __FILE__ ": (error) " format "\n" , ## arg); } while (0) |
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55 #endif |
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56 |
| 355 | 57 /* Version Information */ |
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58 #define DRIVER_VERSION "v0.1.20111215" |
| 355 | 59 #define DRIVER_AUTHOR "Erwin Rol, erwin@erwinrol.com" |
| 60 #define DRIVER_DESC "DMX USB Driver" | |
| 61 | |
| 62 /* Module parameters */ | |
| 63 #if ( LINUX_VERSION_CODE < KERNEL_VERSION(2,6,16) ) | |
| 64 MODULE_PARM(debug, "i"); | |
| 65 MODULE_PARM_DESC(debug, "Debug enabled or not"); | |
| 66 #else | |
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67 //module_param(debug, bool, S_IRUGO | S_IWUSR); |
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68 //MODULE_PARM_DESC(debug, "Debug enabled or not"); |
| 355 | 69 #endif |
| 70 | |
| 71 static struct usb_device_id dmx_usb_table [] = { | |
| 72 { USB_DEVICE_VER(FTDI_VID, FTDI_8U232AM_PID, 0x400, 0xffff) }, | |
| 73 { USB_DEVICE_VER(FTDI_VID, FTDI_8U232AM_ALT_PID, 0x400, 0xffff) }, | |
| 74 { } /* Terminating entry */ | |
| 75 }; | |
| 76 | |
| 77 MODULE_DEVICE_TABLE (usb, dmx_usb_table); | |
| 78 | |
| 79 /* Get a minor range for your devices from the usb maintainer */ | |
| 80 #define DMX_USB_MINOR_BASE 192 | |
| 81 | |
| 82 /* Structure to hold all of our device specific stuff */ | |
| 83 struct dmx_usb_device { | |
| 84 struct usb_device * udev; /* save off the usb device pointer */ | |
| 85 struct usb_interface * interface; /* the interface for this device */ | |
| 86 unsigned char minor; /* the starting minor number for this device */ | |
| 87 unsigned char num_ports; /* the number of ports this device has */ | |
| 88 char num_interrupt_in; /* number of interrupt in endpoints we have */ | |
| 89 char num_bulk_in; /* number of bulk in endpoints we have */ | |
| 90 char num_bulk_out; /* number of bulk out endpoints we have */ | |
| 91 | |
| 92 unsigned char * bulk_in_buffer; /* the buffer to receive data */ | |
| 93 size_t bulk_in_size; /* the size of the receive buffer */ | |
| 94 __u8 bulk_in_endpointAddr; /* the address of the bulk in endpoint */ | |
| 95 | |
| 96 unsigned char * bulk_out_buffer; /* the buffer to send data */ | |
| 97 size_t bulk_out_size; /* the size of the send buffer */ | |
| 98 struct urb * write_urb; /* the urb used to send data */ | |
| 99 __u8 bulk_out_endpointAddr; /* the address of the bulk out endpoint */ | |
| 100 atomic_t write_busy; /* true iff write urb is busy */ | |
| 101 struct completion write_finished; /* wait for the write to finish */ | |
| 102 | |
| 103 int open; /* if the port is open or not */ | |
| 104 int present; /* if the device is not disconnected */ | |
| 105 struct semaphore sem; /* locks this structure */ | |
| 106 }; | |
| 107 | |
| 108 | |
| 109 /* prevent races between open() and disconnect() */ | |
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110 #if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,37) |
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111 static DECLARE_MUTEX(disconnect_sem); |
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112 #else |
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113 static DEFINE_SEMAPHORE(disconnect_sem); |
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114 #endif |
| 355 | 115 |
| 116 /* local function prototypes */ | |
| 117 //static ssize_t dmx_usb_read (struct file *file, char *buffer, size_t count, loff_t *ppos); | |
| 118 static ssize_t dmx_usb_write (struct file *file, const char *buffer, size_t count, loff_t *ppos); | |
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119 #if (LINUX_VERSION_CODE < KERNEL_VERSION(2,6,37) ) |
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120 static int dmx_usb_ioctl (struct inode *inode, struct file *file, unsigned int cmd, unsigned long arg); |
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121 #else |
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122 static long dmx_usb_ioctl (struct file *file, unsigned int cmd, unsigned long arg); |
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123 #endif |
| 355 | 124 static int dmx_usb_open (struct inode *inode, struct file *file); |
| 125 static int dmx_usb_release (struct inode *inode, struct file *file); | |
| 126 | |
| 127 static int dmx_usb_probe (struct usb_interface *interface, const struct usb_device_id *id); | |
| 128 static void dmx_usb_disconnect (struct usb_interface *interface); | |
| 129 | |
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130 static void dmx_usb_write_bulk_callback (struct urb *urb); |
| 355 | 131 |
| 132 static struct file_operations dmx_usb_fops = { | |
| 133 /* | |
| 134 * The owner field is part of the module-locking | |
| 135 * mechanism. The idea is that the kernel knows | |
| 136 * which module to increment the use-counter of | |
| 137 * BEFORE it calls the device's open() function. | |
| 138 * This also means that the kernel can decrement | |
| 139 * the use-counter again before calling release() | |
| 140 * or should the open() function fail. | |
| 141 */ | |
| 142 .owner = THIS_MODULE, | |
| 143 | |
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144 /* .read = dmx_usb_read, */ |
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145 .write = dmx_usb_write, |
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146 #if (LINUX_VERSION_CODE < KERNEL_VERSION(2,6,37) ) |
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147 .ioctl = dmx_usb_ioctl, |
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148 #else |
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149 .unlocked_ioctl = dmx_usb_ioctl, |
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150 #endif |
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151 .open = dmx_usb_open, |
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152 .release = dmx_usb_release, |
| 355 | 153 }; |
| 154 | |
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155 /* |
| 355 | 156 * usb class driver info in order to get a minor number from the usb core, |
| 157 * and to have the device registered with devfs and the driver core | |
| 158 */ | |
| 159 static struct usb_class_driver dmx_usb_class = { | |
| 160 .name = "usb/dmx%d", | |
| 161 .fops = &dmx_usb_fops, | |
| 162 .minor_base = DMX_USB_MINOR_BASE, | |
| 163 }; | |
| 164 | |
| 165 /* usb specific object needed to register this driver with the usb subsystem */ | |
| 166 static struct usb_driver dmx_usb_driver = { | |
| 167 #if ( LINUX_VERSION_CODE < KERNEL_VERSION(2,6,16) ) | |
| 168 .owner = THIS_MODULE, | |
| 169 #endif | |
| 170 .name = "dmx_usb", | |
| 171 .probe = dmx_usb_probe, | |
| 172 .disconnect = dmx_usb_disconnect, | |
| 173 .id_table = dmx_usb_table, | |
| 174 }; | |
| 175 | |
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176 #if ( LINUX_VERSION_CODE < KERNEL_VERSION(2,6,34) ) |
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177 static inline void *usb_alloc_coherent(struct usb_device *dev, size_t size, |
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178 gfp_t mem_flags, dma_addr_t *dma) |
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179 { |
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180 return usb_buffer_alloc(dev, size, mem_flags, dma); |
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181 } |
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182 |
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183 static inline void usb_free_coherent(struct usb_device *dev, size_t size, |
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184 void *addr, dma_addr_t dma) |
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185 { |
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186 return usb_buffer_free(dev, size, addr, dma); |
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187 } |
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188 #endif |
| 355 | 189 |
| 190 /** | |
| 191 */ | |
| 192 static inline void dmx_usb_debug_data (const char *function, int size, const unsigned char *data) | |
| 193 { | |
| 194 int i; | |
| 195 | |
| 196 if (!debug) | |
| 197 return; | |
| 198 | |
| 199 printk (KERN_DEBUG __FILE__": %s - length = %d, data = ", | |
| 200 function, size); | |
| 201 for (i = 0; i < size; ++i) { | |
| 202 printk ("%.2x ", data[i]); | |
| 203 } | |
| 204 printk ("\n"); | |
| 205 } | |
| 206 | |
| 207 static __u32 dmx_usb_baud_to_divisor(int baud) | |
| 208 { | |
| 209 static const unsigned char divfrac[8] = { 0, 3, 2, 4, 1, 5, 6, 7 }; | |
| 210 __u32 divisor; | |
| 211 int divisor3 = 48000000 / 2 / baud; // divisor shifted 3 bits to the left | |
| 212 divisor = divisor3 >> 3; | |
| 213 divisor |= (__u32)divfrac[divisor3 & 0x7] << 14; | |
| 214 /* Deal with special cases for highest baud rates. */ | |
| 215 if (divisor == 1) divisor = 0; else // 1.0 | |
| 216 if (divisor == 0x4001) divisor = 1; // 1.5 | |
| 217 return divisor; | |
| 218 } | |
| 219 | |
| 220 static int dmx_usb_set_speed(struct dmx_usb_device* dev) | |
| 221 { | |
| 222 char *buf; | |
| 223 __u16 urb_value; | |
| 224 __u16 urb_index; | |
| 225 __u32 urb_index_value; | |
| 226 int rv; | |
| 227 | |
| 228 buf = kmalloc(1, GFP_NOIO); | |
| 229 if (!buf) | |
| 230 return -ENOMEM; | |
| 231 | |
| 232 urb_index_value = dmx_usb_baud_to_divisor(250000); | |
| 233 urb_value = (__u16)urb_index_value; | |
| 234 urb_index = (__u16)(urb_index_value >> 16); | |
| 235 | |
| 236 rv = usb_control_msg(dev->udev, | |
| 237 usb_sndctrlpipe(dev->udev, 0), | |
| 238 FTDI_SIO_SET_BAUDRATE_REQUEST, | |
| 239 FTDI_SIO_SET_BAUDRATE_REQUEST_TYPE, | |
| 240 urb_value, urb_index, | |
| 241 buf, 0, HZ*10); | |
| 242 | |
| 243 kfree(buf); | |
| 244 return rv; | |
| 245 } | |
| 246 | |
| 247 static int dmx_usb_setup(struct dmx_usb_device* dev) | |
| 248 { | |
| 249 __u16 urb_value; | |
| 250 char buf[1]; | |
| 251 | |
| 252 urb_value = FTDI_SIO_SET_DATA_STOP_BITS_2 | FTDI_SIO_SET_DATA_PARITY_NONE; | |
| 253 urb_value |= 8; // number of data bits | |
| 254 | |
| 255 if (usb_control_msg(dev->udev, usb_sndctrlpipe(dev->udev, 0), | |
| 256 FTDI_SIO_SET_DATA_REQUEST, | |
| 257 FTDI_SIO_SET_DATA_REQUEST_TYPE, | |
| 258 urb_value , 0, | |
| 259 buf, 0, HZ*10) < 0) { | |
| 260 err("%s FAILED to set databits/stopbits/parity", __FUNCTION__); | |
| 261 } | |
| 262 | |
| 263 if (usb_control_msg(dev->udev, usb_sndctrlpipe(dev->udev, 0), | |
| 264 FTDI_SIO_SET_FLOW_CTRL_REQUEST, | |
| 265 FTDI_SIO_SET_FLOW_CTRL_REQUEST_TYPE, | |
| 266 0, 0, | |
| 267 buf, 0, HZ*10) < 0) { | |
| 268 err("%s error from disable flowcontrol urb", __FUNCTION__); | |
| 269 } | |
| 270 | |
| 271 dmx_usb_set_speed(dev); | |
| 272 | |
| 273 return 0; | |
| 274 } | |
| 275 | |
| 276 static void dmx_usb_set_break(struct dmx_usb_device* dev, int break_state) | |
| 277 { | |
| 278 __u16 urb_value = FTDI_SIO_SET_DATA_STOP_BITS_2 | FTDI_SIO_SET_DATA_PARITY_NONE | 8; | |
| 279 | |
| 280 char buf[2]; | |
| 281 | |
| 282 if (break_state) { | |
| 283 urb_value |= FTDI_SIO_SET_BREAK; | |
| 284 } | |
| 285 | |
| 286 if (usb_control_msg(dev->udev, usb_sndctrlpipe(dev->udev, 0), | |
| 287 FTDI_SIO_SET_DATA_REQUEST, | |
| 288 FTDI_SIO_SET_DATA_REQUEST_TYPE, | |
| 289 urb_value , 0, | |
| 290 buf, 2, HZ*10) < 0) { | |
| 291 err("%s FAILED to enable/disable break state (state was %d)", __FUNCTION__,break_state); | |
| 292 } | |
| 293 | |
| 294 | |
| 295 dbg("%s break state is %d - urb is %d", __FUNCTION__,break_state, urb_value); | |
| 296 } | |
| 297 | |
| 298 /** | |
| 299 */ | |
| 300 static inline void dmx_usb_delete (struct dmx_usb_device *dev) | |
| 301 { | |
| 302 kfree (dev->bulk_in_buffer); | |
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303 usb_free_coherent (dev->udev, dev->bulk_out_size, |
| 355 | 304 dev->bulk_out_buffer, |
| 305 dev->write_urb->transfer_dma); | |
| 306 usb_free_urb (dev->write_urb); | |
| 307 kfree (dev); | |
| 308 } | |
| 309 | |
| 310 | |
| 311 /** | |
| 312 */ | |
| 313 static int dmx_usb_open (struct inode *inode, struct file *file) | |
| 314 { | |
| 315 struct dmx_usb_device *dev = NULL; | |
| 316 struct usb_interface *interface; | |
| 317 int subminor; | |
| 318 int retval = 0; | |
| 319 | |
| 320 dbg("%s", __FUNCTION__); | |
| 321 | |
| 322 subminor = iminor(inode); | |
| 323 | |
| 324 /* prevent disconnects */ | |
| 325 down (&disconnect_sem); | |
| 326 | |
| 327 interface = usb_find_interface (&dmx_usb_driver, subminor); | |
| 328 if (!interface) { | |
| 329 err ("%s - error, can't find device for minor %d", | |
| 330 __FUNCTION__, subminor); | |
| 331 retval = -ENODEV; | |
| 332 goto exit_no_device; | |
| 333 } | |
| 334 | |
| 335 dev = usb_get_intfdata(interface); | |
| 336 if (!dev) { | |
| 337 retval = -ENODEV; | |
| 338 goto exit_no_device; | |
| 339 } | |
| 340 | |
| 341 /* lock this device */ | |
| 342 down (&dev->sem); | |
| 343 | |
| 344 /* increment our usage count for the driver */ | |
| 345 ++dev->open; | |
| 346 | |
| 347 /* save our object in the file's private structure */ | |
| 348 file->private_data = dev; | |
| 349 | |
| 350 /* unlock this device */ | |
| 351 up (&dev->sem); | |
| 352 | |
| 353 exit_no_device: | |
| 354 up (&disconnect_sem); | |
| 355 return retval; | |
| 356 } | |
| 357 | |
| 358 | |
| 359 /** | |
| 360 */ | |
| 361 static int dmx_usb_release (struct inode *inode, struct file *file) | |
| 362 { | |
| 363 struct dmx_usb_device *dev; | |
| 364 int retval = 0; | |
| 365 | |
| 366 dev = (struct dmx_usb_device *)file->private_data; | |
| 367 if (dev == NULL) { | |
| 368 dbg ("%s - object is NULL", __FUNCTION__); | |
| 369 return -ENODEV; | |
| 370 } | |
| 371 | |
| 372 dbg("%s - minor %d", __FUNCTION__, dev->minor); | |
| 373 | |
| 374 /* lock our device */ | |
| 375 down (&dev->sem); | |
| 376 | |
| 377 if (dev->open <= 0) { | |
| 378 dbg ("%s - device not opened", __FUNCTION__); | |
| 379 retval = -ENODEV; | |
| 380 goto exit_not_opened; | |
| 381 } | |
| 382 | |
| 383 /* wait for any bulk writes that might be going on to finish up */ | |
| 384 if (atomic_read (&dev->write_busy)) | |
| 385 wait_for_completion (&dev->write_finished); | |
| 386 | |
| 387 --dev->open; | |
| 388 | |
| 389 if (!dev->present && !dev->open) { | |
| 390 /* the device was unplugged before the file was released */ | |
| 391 up (&dev->sem); | |
| 392 dmx_usb_delete (dev); | |
| 393 return 0; | |
| 394 } | |
| 395 | |
| 396 exit_not_opened: | |
| 397 up (&dev->sem); | |
| 398 | |
| 399 return retval; | |
| 400 } | |
| 401 | |
| 402 #if 0 | |
| 403 | |
| 404 Read is not yet supported | |
| 405 | |
| 406 /** | |
| 407 */ | |
| 408 static ssize_t dmx_usb_read (struct file *file, char *buffer, size_t count, loff_t *ppos) | |
| 409 { | |
| 410 struct dmx_usb_device *dev; | |
| 411 int retval = 0; | |
| 412 int bytes_read; | |
| 413 | |
| 414 dev = (struct dmx_usb_device *)file->private_data; | |
| 415 | |
| 416 dbg("%s - minor %d, count = %Zd", __FUNCTION__, dev->minor, count); | |
| 417 | |
| 418 /* lock this object */ | |
| 419 down (&dev->sem); | |
| 420 | |
| 421 /* verify that the device wasn't unplugged */ | |
| 422 if (!dev->present) { | |
| 423 up (&dev->sem); | |
| 424 return -ENODEV; | |
| 425 } | |
| 426 | |
| 427 /* do a blocking bulk read to get data from the device */ | |
| 428 retval = usb_bulk_msg (dev->udev, | |
| 429 usb_rcvbulkpipe (dev->udev, | |
| 430 dev->bulk_in_endpointAddr), | |
| 431 dev->bulk_in_buffer, | |
| 432 min (dev->bulk_in_size, count), | |
| 433 &bytes_read, HZ*10); | |
| 434 | |
| 435 /* if the read was successful, copy the data to userspace */ | |
| 436 if (!retval) { | |
| 437 if (copy_to_user (buffer, dev->bulk_in_buffer+2, bytes_read-2)) | |
| 438 retval = -EFAULT; | |
| 439 else | |
| 440 retval = bytes_read; | |
| 441 } | |
| 442 | |
| 443 /* unlock the device */ | |
| 444 up (&dev->sem); | |
| 445 return retval; | |
| 446 } | |
| 447 | |
| 448 #endif | |
| 449 | |
| 450 static __u16 dmx_usb_get_status(struct dmx_usb_device* dev) | |
| 451 { | |
| 452 int retval = 0; | |
| 453 int count = 0; | |
| 454 __u16 buf; | |
| 455 | |
| 456 retval = usb_bulk_msg (dev->udev, | |
| 457 usb_rcvbulkpipe (dev->udev, dev->bulk_in_endpointAddr), | |
| 458 &buf, 2, &count, HZ*10); | |
| 459 | |
| 460 if (retval) | |
| 461 return 0; | |
|
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462 |
| 355 | 463 return buf; |
| 464 } | |
| 465 | |
| 466 | |
| 467 | |
| 468 /** | |
| 469 * dmx_usb_write | |
| 470 * | |
| 471 * A device driver has to decide how to report I/O errors back to the | |
| 472 * user. The safest course is to wait for the transfer to finish before | |
| 473 * returning so that any errors will be reported reliably. dmx_usb_read() | |
| 474 * works like this. But waiting for I/O is slow, so many drivers only | |
| 475 * check for errors during I/O initiation and do not report problems | |
| 476 * that occur during the actual transfer. That's what we will do here. | |
| 477 * | |
| 478 * A driver concerned with maximum I/O throughput would use double- | |
| 479 * buffering: Two urbs would be devoted to write transfers, so that | |
| 480 * one urb could always be active while the other was waiting for the | |
| 481 * user to send more data. | |
| 482 */ | |
| 483 static ssize_t dmx_usb_write (struct file *file, const char *buffer, size_t count, loff_t *ppos) | |
| 484 { | |
| 485 struct dmx_usb_device *dev; | |
| 486 ssize_t bytes_written = 0; | |
| 487 int retval = 0; | |
| 488 __u16 stat; | |
| 489 | |
| 490 dev = (struct dmx_usb_device *)file->private_data; | |
| 491 | |
| 492 dbg("%s - minor %d, count = %Zd", __FUNCTION__, dev->minor, count); | |
| 493 | |
| 494 /* lock this object */ | |
| 495 down (&dev->sem); | |
| 496 | |
| 497 /* verify that the device wasn't unplugged */ | |
| 498 if (!dev->present) { | |
| 499 retval = -ENODEV; | |
| 500 goto exit; | |
| 501 } | |
| 502 | |
| 503 /* verify that we actually have some data to write */ | |
| 504 if (count == 0) { | |
| 505 dbg("%s - write request of 0 bytes", __FUNCTION__); | |
| 506 goto exit; | |
| 507 } | |
| 508 | |
| 509 /* wait for a previous write to finish up; we don't use a timeout | |
| 510 * and so a nonresponsive device can delay us indefinitely. | |
| 511 */ | |
| 512 if (atomic_read (&dev->write_busy)) | |
| 513 wait_for_completion (&dev->write_finished); | |
| 514 | |
| 515 /* we can only write as much as our buffer will hold */ | |
| 516 bytes_written = min (dev->bulk_out_size, count); | |
| 517 | |
| 518 /* copy the data from userspace into our transfer buffer; | |
| 519 * this is the only copy required. | |
| 520 */ | |
| 521 if (copy_from_user(dev->write_urb->transfer_buffer, buffer, | |
| 522 bytes_written)) { | |
| 523 retval = -EFAULT; | |
| 524 goto exit; | |
| 525 } | |
| 526 | |
| 527 dmx_usb_debug_data (__FUNCTION__, bytes_written, | |
| 528 dev->write_urb->transfer_buffer); | |
| 529 | |
| 530 /* this urb was already set up, except for this write size */ | |
| 531 dev->write_urb->transfer_buffer_length = bytes_written; | |
| 532 | |
| 533 /* Poll the device to see if the transmit buffer is empty */ | |
| 534 do { | |
| 535 stat = dmx_usb_get_status(dev); | |
| 536 if (stat == 0) { | |
| 537 retval = -EFAULT; | |
| 538 goto exit; | |
| 539 } | |
| 540 } while ( (stat & ((FTDI_RS_TEMT) << 8) ) == 0 ) ; | |
| 541 | |
| 542 /* the transmit buffer is empty, now toggle the break */ | |
| 543 dmx_usb_set_break(dev, 1); | |
| 544 dmx_usb_set_break(dev, 0); | |
| 545 | |
| 546 /* send the data out the bulk port */ | |
| 547 /* a character device write uses GFP_KERNEL, | |
| 548 unless a spinlock is held */ | |
| 549 init_completion (&dev->write_finished); | |
| 550 atomic_set (&dev->write_busy, 1); | |
| 551 retval = usb_submit_urb(dev->write_urb, GFP_KERNEL); | |
| 552 if (retval) { | |
| 553 atomic_set (&dev->write_busy, 0); | |
| 554 err("%s - failed submitting write urb, error %d", | |
| 555 __FUNCTION__, retval); | |
| 556 } else { | |
| 557 retval = bytes_written; | |
| 558 } | |
| 559 | |
| 560 exit: | |
| 561 /* unlock the device */ | |
| 562 up (&dev->sem); | |
| 563 | |
| 564 return retval; | |
| 565 } | |
| 566 | |
| 567 | |
| 568 /** | |
| 569 */ | |
|
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570 #if (LINUX_VERSION_CODE < KERNEL_VERSION(2,6,37) ) |
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571 static int dmx_usb_ioctl (struct inode *inode, struct file *file, unsigned int cmd, unsigned long arg) |
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572 #else |
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573 static long dmx_usb_ioctl (struct file *file, unsigned int cmd, unsigned long arg) |
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574 #endif |
| 355 | 575 { |
| 576 struct dmx_usb_device *dev; | |
| 577 | |
| 578 dev = (struct dmx_usb_device *)file->private_data; | |
| 579 | |
| 580 /* lock this object */ | |
| 581 down (&dev->sem); | |
| 582 | |
| 583 /* verify that the device wasn't unplugged */ | |
| 584 if (!dev->present) { | |
| 585 up (&dev->sem); | |
| 586 return -ENODEV; | |
| 587 } | |
| 588 | |
| 589 dbg("%s - minor %d, cmd 0x%.4x, arg %ld", __FUNCTION__, | |
| 590 dev->minor, cmd, arg); | |
| 591 | |
| 592 /* fill in your device specific stuff here */ | |
| 593 | |
| 594 /* unlock the device */ | |
| 595 up (&dev->sem); | |
| 596 | |
| 597 /* return that we did not understand this ioctl call */ | |
| 598 return -ENOTTY; | |
| 599 } | |
| 600 | |
| 601 | |
| 602 /** | |
| 603 */ | |
|
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604 static void dmx_usb_write_bulk_callback (struct urb *urb) |
| 355 | 605 { |
| 606 struct dmx_usb_device *dev = (struct dmx_usb_device *)urb->context; | |
| 607 | |
| 608 dbg("%s - minor %d", __FUNCTION__, dev->minor); | |
| 609 | |
| 610 /* sync/async unlink faults aren't errors */ | |
| 611 if (urb->status && !(urb->status == -ENOENT || | |
| 612 urb->status == -ECONNRESET)) { | |
| 613 dbg("%s - nonzero write bulk status received: %d", | |
| 614 __FUNCTION__, urb->status); | |
| 615 } | |
| 616 | |
| 617 /* notify anyone waiting that the write has finished */ | |
| 618 atomic_set (&dev->write_busy, 0); | |
| 619 complete (&dev->write_finished); | |
| 620 } | |
| 621 | |
| 622 /** | |
| 623 * | |
| 624 * Called by the usb core when a new device is connected that it thinks | |
| 625 * this driver might be interested in. | |
| 626 */ | |
| 627 static int dmx_usb_probe(struct usb_interface *interface, const struct usb_device_id *id) | |
| 628 { | |
| 629 struct usb_device *udev = interface_to_usbdev(interface); | |
| 630 struct dmx_usb_device *dev = NULL; | |
| 631 struct usb_host_interface *iface_desc; | |
| 632 struct usb_endpoint_descriptor *endpoint; | |
| 633 size_t buffer_size; | |
| 634 int i; | |
| 635 int retval = -ENOMEM; | |
| 636 | |
| 637 /* See if the device offered us matches what we can accept */ | |
|
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638 if ((le16_to_cpu(udev->descriptor.idVendor) != FTDI_VID) || |
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639 (le16_to_cpu(udev->descriptor.idProduct) != FTDI_8U232AM_PID)) { |
| 355 | 640 return -ENODEV; |
| 641 } | |
| 642 | |
| 643 /* allocate memory for our device state and initialize it */ | |
| 644 dev = kmalloc (sizeof(struct dmx_usb_device), GFP_KERNEL); | |
| 645 if (dev == NULL) { | |
| 646 err ("Out of memory"); | |
| 647 return -ENOMEM; | |
| 648 } | |
| 649 memset (dev, 0x00, sizeof (*dev)); | |
| 650 | |
| 651 init_MUTEX (&dev->sem); | |
| 652 dev->udev = udev; | |
| 653 dev->interface = interface; | |
| 654 | |
| 655 /* set up the endpoint information */ | |
| 656 /* check out the endpoints */ | |
| 657 /* use only the first bulk-in and bulk-out endpoints */ | |
| 658 iface_desc = &interface->altsetting[0]; | |
| 659 for (i = 0; i < iface_desc->desc.bNumEndpoints; ++i) { | |
| 660 endpoint = &iface_desc->endpoint[i].desc; | |
| 661 | |
| 662 if (!dev->bulk_in_endpointAddr && | |
| 663 (endpoint->bEndpointAddress & USB_DIR_IN) && | |
| 664 ((endpoint->bmAttributes & USB_ENDPOINT_XFERTYPE_MASK) | |
| 665 == USB_ENDPOINT_XFER_BULK)) { | |
| 666 /* we found a bulk in endpoint */ | |
| 667 buffer_size = endpoint->wMaxPacketSize; | |
| 668 dev->bulk_in_size = buffer_size; | |
| 669 dev->bulk_in_endpointAddr = endpoint->bEndpointAddress; | |
| 670 dev->bulk_in_buffer = kmalloc (buffer_size, GFP_KERNEL); | |
| 671 if (!dev->bulk_in_buffer) { | |
| 672 err("Couldn't allocate bulk_in_buffer"); | |
| 673 goto error; | |
| 674 } | |
| 675 } | |
| 676 | |
| 677 if (!dev->bulk_out_endpointAddr && | |
| 678 !(endpoint->bEndpointAddress & USB_DIR_IN) && | |
| 679 ((endpoint->bmAttributes & USB_ENDPOINT_XFERTYPE_MASK) | |
| 680 == USB_ENDPOINT_XFER_BULK)) { | |
| 681 /* we found a bulk out endpoint */ | |
| 682 /* a probe() may sleep and has no restrictions on memory allocations */ | |
| 683 dev->write_urb = usb_alloc_urb(0, GFP_KERNEL); | |
| 684 if (!dev->write_urb) { | |
| 685 err("No free urbs available"); | |
| 686 goto error; | |
| 687 } | |
| 688 dev->bulk_out_endpointAddr = endpoint->bEndpointAddress; | |
| 689 | |
| 690 /* on some platforms using this kind of buffer alloc | |
| 691 * call eliminates a dma "bounce buffer". | |
| 692 * | |
| 693 * NOTE: you'd normally want i/o buffers that hold | |
| 694 * more than one packet, so that i/o delays between | |
| 695 * packets don't hurt throughput. | |
| 696 */ | |
| 697 buffer_size = endpoint->wMaxPacketSize; | |
| 698 dev->bulk_out_size = 513; | |
| 699 dev->write_urb->transfer_flags = URB_NO_TRANSFER_DMA_MAP; | |
|
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700 dev->bulk_out_buffer = usb_alloc_coherent (udev, |
| 355 | 701 buffer_size, GFP_KERNEL, |
| 702 &dev->write_urb->transfer_dma); | |
| 703 if (!dev->bulk_out_buffer) { | |
| 704 err("Couldn't allocate bulk_out_buffer"); | |
| 705 goto error; | |
| 706 } | |
| 707 usb_fill_bulk_urb(dev->write_urb, udev, | |
| 708 usb_sndbulkpipe(udev, | |
| 709 endpoint->bEndpointAddress), | |
| 710 dev->bulk_out_buffer, buffer_size, | |
| 711 dmx_usb_write_bulk_callback, dev); | |
| 712 } | |
| 713 } | |
| 714 if (!(dev->bulk_in_endpointAddr && dev->bulk_out_endpointAddr)) { | |
| 715 err("Couldn't find both bulk-in and bulk-out endpoints"); | |
| 716 goto error; | |
| 717 } | |
| 718 | |
| 719 dmx_usb_setup(dev); | |
| 720 | |
| 721 /* allow device read, write and ioctl */ | |
| 722 dev->present = 1; | |
| 723 | |
| 724 /* we can register the device now, as it is ready */ | |
| 725 usb_set_intfdata (interface, dev); | |
| 726 retval = usb_register_dev (interface, &dmx_usb_class); | |
| 727 if (retval) { | |
| 728 /* something prevented us from registering this driver */ | |
| 729 err ("Not able to get a minor for this device."); | |
| 730 usb_set_intfdata (interface, NULL); | |
| 731 goto error; | |
| 732 } | |
| 733 | |
| 734 dev->minor = interface->minor; | |
| 735 | |
| 736 /* let the user know what node this device is now attached to */ | |
|
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737 info ("DMX USB device now attached to dmx%d", dev->minor); |
| 355 | 738 return 0; |
| 739 | |
| 740 error: | |
| 741 dmx_usb_delete (dev); | |
| 742 return retval; | |
| 743 } | |
| 744 | |
| 745 | |
| 746 /** | |
| 747 * | |
| 748 * Called by the usb core when the device is removed from the system. | |
| 749 * | |
| 750 * This routine guarantees that the driver will not submit any more urbs | |
| 751 * by clearing dev->udev. It is also supposed to terminate any currently | |
| 752 * active urbs. Unfortunately, usb_bulk_msg(), used in dmx_usb_read(), does | |
| 753 * not provide any way to do this. But at least we can cancel an active | |
| 754 * write. | |
| 755 */ | |
| 756 static void dmx_usb_disconnect(struct usb_interface *interface) | |
| 757 { | |
| 758 struct dmx_usb_device *dev; | |
| 759 int minor; | |
| 760 | |
| 761 /* prevent races with open() */ | |
| 762 down (&disconnect_sem); | |
| 763 | |
| 764 dev = usb_get_intfdata (interface); | |
| 765 usb_set_intfdata (interface, NULL); | |
| 766 | |
| 767 down (&dev->sem); | |
| 768 | |
| 769 minor = dev->minor; | |
| 770 | |
| 771 /* give back our minor */ | |
| 772 usb_deregister_dev (interface, &dmx_usb_class); | |
| 773 | |
| 774 /* terminate an ongoing write */ | |
| 775 if (atomic_read (&dev->write_busy)) { | |
| 776 usb_unlink_urb (dev->write_urb); | |
| 777 wait_for_completion (&dev->write_finished); | |
| 778 } | |
| 779 | |
| 780 /* prevent device read, write and ioctl */ | |
| 781 dev->present = 0; | |
| 782 | |
| 783 up (&dev->sem); | |
| 784 | |
| 785 /* if the device is opened, dmx_usb_release will clean this up */ | |
| 786 if (!dev->open) | |
| 787 dmx_usb_delete (dev); | |
| 788 | |
| 789 up (&disconnect_sem); | |
| 790 | |
|
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791 info("DMX USB #%d now disconnected", minor); |
| 355 | 792 } |
| 793 | |
| 794 | |
| 795 | |
| 796 /** | |
| 797 * dmx_usb_init | |
| 798 */ | |
| 799 static int __init dmx_usb_init(void) | |
| 800 { | |
| 801 int result; | |
| 802 | |
| 803 /* register this driver with the USB subsystem */ | |
| 804 result = usb_register(&dmx_usb_driver); | |
| 805 if (result) { | |
| 806 err("usb_register failed. Error number %d", | |
| 807 result); | |
| 808 return result; | |
| 809 } | |
| 810 | |
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811 info(DRIVER_DESC " " DRIVER_VERSION); |
| 355 | 812 return 0; |
| 813 } | |
| 814 | |
| 815 | |
| 816 /** | |
| 817 * dmx_usb_exit | |
| 818 */ | |
| 819 static void __exit dmx_usb_exit(void) | |
| 820 { | |
| 821 /* deregister this driver with the USB subsystem */ | |
| 822 usb_deregister(&dmx_usb_driver); | |
| 823 } | |
| 824 | |
| 825 | |
| 826 module_init (dmx_usb_init); | |
| 827 module_exit (dmx_usb_exit); | |
| 828 | |
| 829 MODULE_AUTHOR(DRIVER_AUTHOR); | |
| 830 MODULE_DESCRIPTION(DRIVER_DESC); | |
| 831 MODULE_LICENSE("GPL"); | |
| 832 |