1 /* 2 * USB ZyXEL omni.net LCD PLUS driver 3 * 4 * This program is free software; you can redistribute it and/or 5 * modify it under the terms of the GNU General Public License version 6 * 2 as published by the Free Software Foundation. 7 * 8 * See Documentation/usb/usb-serial.txt for more information on using this 9 * driver 10 * 11 * Please report both successes and troubles to the author at omninet@kroah.com 12 * 13 * (05/30/2001) gkh 14 * switched from using spinlock to a semaphore, which fixes lots of 15 * problems. 16 * 17 * (04/08/2001) gb 18 * Identify version on module load. 19 * 20 * (11/01/2000) Adam J. Richter 21 * usb_device_id table support 22 * 23 * (10/05/2000) gkh 24 * Fixed bug with urb->dev not being set properly, now that the usb 25 * core needs it. 26 * 27 * (08/28/2000) gkh 28 * Added locks for SMP safeness. 29 * Fixed MOD_INC and MOD_DEC logic and the ability to open a port more 30 * than once. 31 * Fixed potential race in omninet_write_bulk_callback 32 * 33 * (07/19/2000) gkh 34 * Added module_init and module_exit functions to handle the fact that this 35 * driver is a loadable module now. 36 * 37 */ 38 39 #include <linux/kernel.h> 40 #include <linux/errno.h> 41 #include <linux/init.h> 42 #include <linux/slab.h> 43 #include <linux/tty.h> 44 #include <linux/tty_driver.h> 45 #include <linux/tty_flip.h> 46 #include <linux/module.h> 47 #include <linux/spinlock.h> 48 #include <linux/uaccess.h> 49 #include <linux/usb.h> 50 #include <linux/usb/serial.h> 51 52 static int debug; 53 54 /* 55 * Version Information 56 */ 57 #define DRIVER_VERSION "v1.1" 58 #define DRIVER_AUTHOR "Alessandro Zummo" 59 #define DRIVER_DESC "USB ZyXEL omni.net LCD PLUS Driver" 60 61 #define ZYXEL_VENDOR_ID 0x0586 62 #define ZYXEL_OMNINET_ID 0x1000 63 /* This one seems to be a re-branded ZyXEL device */ 64 #define BT_IGNITIONPRO_ID 0x2000 65 66 /* function prototypes */ 67 static int omninet_open(struct tty_struct *tty, struct usb_serial_port *port); 68 static void omninet_close(struct usb_serial_port *port); 69 static void omninet_read_bulk_callback(struct urb *urb); 70 static void omninet_write_bulk_callback(struct urb *urb); 71 static int omninet_write(struct tty_struct *tty, struct usb_serial_port *port, 72 const unsigned char *buf, int count); 73 static int omninet_write_room(struct tty_struct *tty); 74 static void omninet_disconnect(struct usb_serial *serial); 75 static void omninet_release(struct usb_serial *serial); 76 static int omninet_attach(struct usb_serial *serial); 77 78 static const struct usb_device_id id_table[] = { 79 { USB_DEVICE(ZYXEL_VENDOR_ID, ZYXEL_OMNINET_ID) }, 80 { USB_DEVICE(ZYXEL_VENDOR_ID, BT_IGNITIONPRO_ID) }, 81 { } /* Terminating entry */ 82 }; 83 84 MODULE_DEVICE_TABLE(usb, id_table); 85 86 static struct usb_driver omninet_driver = { 87 .name = "omninet", 88 .probe = usb_serial_probe, 89 .disconnect = usb_serial_disconnect, 90 .id_table = id_table, 91 .no_dynamic_id = 1, 92 }; 93 94 95 static struct usb_serial_driver zyxel_omninet_device = { 96 .driver = { 97 .owner = THIS_MODULE, 98 .name = "omninet", 99 }, 100 .description = "ZyXEL - omni.net lcd plus usb", 101 .usb_driver = &omninet_driver, 102 .id_table = id_table, 103 .num_ports = 1, 104 .attach = omninet_attach, 105 .open = omninet_open, 106 .close = omninet_close, 107 .write = omninet_write, 108 .write_room = omninet_write_room, 109 .read_bulk_callback = omninet_read_bulk_callback, 110 .write_bulk_callback = omninet_write_bulk_callback, 111 .disconnect = omninet_disconnect, 112 .release = omninet_release, 113 }; 114 115 116 /* The protocol. 117 * 118 * The omni.net always exchange 64 bytes of data with the host. The first 119 * four bytes are the control header, you can see it in the above structure. 120 * 121 * oh_seq is a sequence number. Don't know if/how it's used. 122 * oh_len is the length of the data bytes in the packet. 123 * oh_xxx Bit-mapped, related to handshaking and status info. 124 * I normally set it to 0x03 in trasmitted frames. 125 * 7: Active when the TA is in a CONNECTed state. 126 * 6: unknown 127 * 5: handshaking, unknown 128 * 4: handshaking, unknown 129 * 3: unknown, usually 0 130 * 2: unknown, usually 0 131 * 1: handshaking, unknown, usually set to 1 in trasmitted frames 132 * 0: handshaking, unknown, usually set to 1 in trasmitted frames 133 * oh_pad Probably a pad byte. 134 * 135 * After the header you will find data bytes if oh_len was greater than zero. 136 * 137 */ 138 139 struct omninet_header { 140 __u8 oh_seq; 141 __u8 oh_len; 142 __u8 oh_xxx; 143 __u8 oh_pad; 144 }; 145 146 struct omninet_data { 147 __u8 od_outseq; /* Sequence number for bulk_out URBs */ 148 }; 149 150 static int omninet_attach(struct usb_serial *serial) 151 { 152 struct omninet_data *od; 153 struct usb_serial_port *port = serial->port[0]; 154 155 od = kmalloc(sizeof(struct omninet_data), GFP_KERNEL); 156 if (!od) { 157 dev_err(&port->dev, "%s- kmalloc(%Zd) failed.\n", 158 __func__, sizeof(struct omninet_data)); 159 return -ENOMEM; 160 } 161 usb_set_serial_port_data(port, od); 162 return 0; 163 } 164 165 static int omninet_open(struct tty_struct *tty, struct usb_serial_port *port) 166 { 167 struct usb_serial *serial = port->serial; 168 struct usb_serial_port *wport; 169 int result = 0; 170 171 dbg("%s - port %d", __func__, port->number); 172 173 wport = serial->port[1]; 174 tty_port_tty_set(&wport->port, tty); 175 176 /* Start reading from the device */ 177 usb_fill_bulk_urb(port->read_urb, serial->dev, 178 usb_rcvbulkpipe(serial->dev, 179 port->bulk_in_endpointAddress), 180 port->read_urb->transfer_buffer, 181 port->read_urb->transfer_buffer_length, 182 omninet_read_bulk_callback, port); 183 result = usb_submit_urb(port->read_urb, GFP_KERNEL); 184 if (result) 185 dev_err(&port->dev, 186 "%s - failed submitting read urb, error %d\n", 187 __func__, result); 188 return result; 189 } 190 191 static void omninet_close(struct usb_serial_port *port) 192 { 193 dbg("%s - port %d", __func__, port->number); 194 usb_kill_urb(port->read_urb); 195 } 196 197 198 #define OMNINET_DATAOFFSET 0x04 199 #define OMNINET_HEADERLEN sizeof(struct omninet_header) 200 #define OMNINET_BULKOUTSIZE (64 - OMNINET_HEADERLEN) 201 202 static void omninet_read_bulk_callback(struct urb *urb) 203 { 204 struct usb_serial_port *port = urb->context; 205 unsigned char *data = urb->transfer_buffer; 206 struct omninet_header *header = (struct omninet_header *) &data[0]; 207 int status = urb->status; 208 int result; 209 int i; 210 211 dbg("%s - port %d", __func__, port->number); 212 213 if (status) { 214 dbg("%s - nonzero read bulk status received: %d", 215 __func__, status); 216 return; 217 } 218 219 if (debug && header->oh_xxx != 0x30) { 220 if (urb->actual_length) { 221 printk(KERN_DEBUG "%s: omninet_read %d: ", 222 __FILE__, header->oh_len); 223 for (i = 0; i < (header->oh_len + 224 OMNINET_HEADERLEN); i++) 225 printk("%.2x ", data[i]); 226 printk("\n"); 227 } 228 } 229 230 if (urb->actual_length && header->oh_len) { 231 struct tty_struct *tty = tty_port_tty_get(&port->port); 232 tty_insert_flip_string(tty, data + OMNINET_DATAOFFSET, 233 header->oh_len); 234 tty_flip_buffer_push(tty); 235 tty_kref_put(tty); 236 } 237 238 /* Continue trying to always read */ 239 usb_fill_bulk_urb(urb, port->serial->dev, 240 usb_rcvbulkpipe(port->serial->dev, 241 port->bulk_in_endpointAddress), 242 urb->transfer_buffer, urb->transfer_buffer_length, 243 omninet_read_bulk_callback, port); 244 result = usb_submit_urb(urb, GFP_ATOMIC); 245 if (result) 246 dev_err(&port->dev, 247 "%s - failed resubmitting read urb, error %d\n", 248 __func__, result); 249 250 return; 251 } 252 253 static int omninet_write(struct tty_struct *tty, struct usb_serial_port *port, 254 const unsigned char *buf, int count) 255 { 256 struct usb_serial *serial = port->serial; 257 struct usb_serial_port *wport = serial->port[1]; 258 259 struct omninet_data *od = usb_get_serial_port_data(port); 260 struct omninet_header *header = (struct omninet_header *) 261 wport->write_urb->transfer_buffer; 262 263 int result; 264 265 dbg("%s - port %d", __func__, port->number); 266 267 if (count == 0) { 268 dbg("%s - write request of 0 bytes", __func__); 269 return 0; 270 } 271 272 spin_lock_bh(&wport->lock); 273 if (wport->write_urb_busy) { 274 spin_unlock_bh(&wport->lock); 275 dbg("%s - already writing", __func__); 276 return 0; 277 } 278 wport->write_urb_busy = 1; 279 spin_unlock_bh(&wport->lock); 280 281 count = (count > OMNINET_BULKOUTSIZE) ? OMNINET_BULKOUTSIZE : count; 282 283 memcpy(wport->write_urb->transfer_buffer + OMNINET_DATAOFFSET, 284 buf, count); 285 286 usb_serial_debug_data(debug, &port->dev, __func__, count, 287 wport->write_urb->transfer_buffer); 288 289 header->oh_seq = od->od_outseq++; 290 header->oh_len = count; 291 header->oh_xxx = 0x03; 292 header->oh_pad = 0x00; 293 294 /* send the data out the bulk port, always 64 bytes */ 295 wport->write_urb->transfer_buffer_length = 64; 296 297 wport->write_urb->dev = serial->dev; 298 result = usb_submit_urb(wport->write_urb, GFP_ATOMIC); 299 if (result) { 300 wport->write_urb_busy = 0; 301 dev_err(&port->dev, 302 "%s - failed submitting write urb, error %d\n", 303 __func__, result); 304 } else 305 result = count; 306 307 return result; 308 } 309 310 311 static int omninet_write_room(struct tty_struct *tty) 312 { 313 struct usb_serial_port *port = tty->driver_data; 314 struct usb_serial *serial = port->serial; 315 struct usb_serial_port *wport = serial->port[1]; 316 317 int room = 0; /* Default: no room */ 318 319 /* FIXME: no consistent locking for write_urb_busy */ 320 if (wport->write_urb_busy) 321 room = wport->bulk_out_size - OMNINET_HEADERLEN; 322 323 dbg("%s - returns %d", __func__, room); 324 325 return room; 326 } 327 328 static void omninet_write_bulk_callback(struct urb *urb) 329 { 330 /* struct omninet_header *header = (struct omninet_header *) 331 urb->transfer_buffer; */ 332 struct usb_serial_port *port = urb->context; 333 int status = urb->status; 334 335 dbg("%s - port %0x", __func__, port->number); 336 337 port->write_urb_busy = 0; 338 if (status) { 339 dbg("%s - nonzero write bulk status received: %d", 340 __func__, status); 341 return; 342 } 343 344 usb_serial_port_softint(port); 345 } 346 347 348 static void omninet_disconnect(struct usb_serial *serial) 349 { 350 struct usb_serial_port *wport = serial->port[1]; 351 352 dbg("%s", __func__); 353 354 usb_kill_urb(wport->write_urb); 355 } 356 357 358 static void omninet_release(struct usb_serial *serial) 359 { 360 struct usb_serial_port *port = serial->port[0]; 361 362 dbg("%s", __func__); 363 364 kfree(usb_get_serial_port_data(port)); 365 } 366 367 368 static int __init omninet_init(void) 369 { 370 int retval; 371 retval = usb_serial_register(&zyxel_omninet_device); 372 if (retval) 373 goto failed_usb_serial_register; 374 retval = usb_register(&omninet_driver); 375 if (retval) 376 goto failed_usb_register; 377 printk(KERN_INFO KBUILD_MODNAME ": " DRIVER_VERSION ":" 378 DRIVER_DESC "\n"); 379 return 0; 380 failed_usb_register: 381 usb_serial_deregister(&zyxel_omninet_device); 382 failed_usb_serial_register: 383 return retval; 384 } 385 386 387 static void __exit omninet_exit(void) 388 { 389 usb_deregister(&omninet_driver); 390 usb_serial_deregister(&zyxel_omninet_device); 391 } 392 393 394 module_init(omninet_init); 395 module_exit(omninet_exit); 396 397 MODULE_AUTHOR(DRIVER_AUTHOR); 398 MODULE_DESCRIPTION(DRIVER_DESC); 399 MODULE_LICENSE("GPL"); 400 401 module_param(debug, bool, S_IRUGO | S_IWUSR); 402 MODULE_PARM_DESC(debug, "Debug enabled or not"); 403