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 struct file *filp); 69 static void omninet_close(struct tty_struct *tty, struct usb_serial_port *port, 70 struct file *filp); 71 static void omninet_read_bulk_callback(struct urb *urb); 72 static void omninet_write_bulk_callback(struct urb *urb); 73 static int omninet_write(struct tty_struct *tty, struct usb_serial_port *port, 74 const unsigned char *buf, int count); 75 static int omninet_write_room(struct tty_struct *tty); 76 static void omninet_shutdown(struct usb_serial *serial); 77 static int omninet_attach(struct usb_serial *serial); 78 79 static struct usb_device_id id_table[] = { 80 { USB_DEVICE(ZYXEL_VENDOR_ID, ZYXEL_OMNINET_ID) }, 81 { USB_DEVICE(ZYXEL_VENDOR_ID, BT_IGNITIONPRO_ID) }, 82 { } /* Terminating entry */ 83 }; 84 85 MODULE_DEVICE_TABLE(usb, id_table); 86 87 static struct usb_driver omninet_driver = { 88 .name = "omninet", 89 .probe = usb_serial_probe, 90 .disconnect = usb_serial_disconnect, 91 .id_table = id_table, 92 .no_dynamic_id = 1, 93 }; 94 95 96 static struct usb_serial_driver zyxel_omninet_device = { 97 .driver = { 98 .owner = THIS_MODULE, 99 .name = "omninet", 100 }, 101 .description = "ZyXEL - omni.net lcd plus usb", 102 .usb_driver = &omninet_driver, 103 .id_table = id_table, 104 .num_ports = 1, 105 .attach = omninet_attach, 106 .open = omninet_open, 107 .close = omninet_close, 108 .write = omninet_write, 109 .write_room = omninet_write_room, 110 .read_bulk_callback = omninet_read_bulk_callback, 111 .write_bulk_callback = omninet_write_bulk_callback, 112 .shutdown = omninet_shutdown, 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, 166 struct usb_serial_port *port, struct file *filp) 167 { 168 struct usb_serial *serial = port->serial; 169 struct usb_serial_port *wport; 170 int result = 0; 171 172 dbg("%s - port %d", __func__, port->number); 173 174 wport = serial->port[1]; 175 tty_port_tty_set(&wport->port, tty); 176 177 /* Start reading from the device */ 178 usb_fill_bulk_urb(port->read_urb, serial->dev, 179 usb_rcvbulkpipe(serial->dev, 180 port->bulk_in_endpointAddress), 181 port->read_urb->transfer_buffer, 182 port->read_urb->transfer_buffer_length, 183 omninet_read_bulk_callback, port); 184 result = usb_submit_urb(port->read_urb, GFP_KERNEL); 185 if (result) 186 dev_err(&port->dev, 187 "%s - failed submitting read urb, error %d\n", 188 __func__, result); 189 return result; 190 } 191 192 static void omninet_close(struct tty_struct *tty, 193 struct usb_serial_port *port, struct file *filp) 194 { 195 dbg("%s - port %d", __func__, port->number); 196 usb_kill_urb(port->read_urb); 197 } 198 199 200 #define OMNINET_DATAOFFSET 0x04 201 #define OMNINET_HEADERLEN sizeof(struct omninet_header) 202 #define OMNINET_BULKOUTSIZE (64 - OMNINET_HEADERLEN) 203 204 static void omninet_read_bulk_callback(struct urb *urb) 205 { 206 struct usb_serial_port *port = urb->context; 207 unsigned char *data = urb->transfer_buffer; 208 struct omninet_header *header = (struct omninet_header *) &data[0]; 209 int status = urb->status; 210 int result; 211 int i; 212 213 dbg("%s - port %d", __func__, port->number); 214 215 if (status) { 216 dbg("%s - nonzero read bulk status received: %d", 217 __func__, status); 218 return; 219 } 220 221 if (debug && header->oh_xxx != 0x30) { 222 if (urb->actual_length) { 223 printk(KERN_DEBUG __FILE__ 224 ": omninet_read %d: ", header->oh_len); 225 for (i = 0; i < (header->oh_len + 226 OMNINET_HEADERLEN); i++) 227 printk("%.2x ", data[i]); 228 printk("\n"); 229 } 230 } 231 232 if (urb->actual_length && header->oh_len) { 233 struct tty_struct *tty = tty_port_tty_get(&port->port); 234 tty_insert_flip_string(tty, data + OMNINET_DATAOFFSET, 235 header->oh_len); 236 tty_flip_buffer_push(tty); 237 tty_kref_put(tty); 238 } 239 240 /* Continue trying to always read */ 241 usb_fill_bulk_urb(urb, port->serial->dev, 242 usb_rcvbulkpipe(port->serial->dev, 243 port->bulk_in_endpointAddress), 244 urb->transfer_buffer, urb->transfer_buffer_length, 245 omninet_read_bulk_callback, port); 246 result = usb_submit_urb(urb, GFP_ATOMIC); 247 if (result) 248 dev_err(&port->dev, 249 "%s - failed resubmitting read urb, error %d\n", 250 __func__, result); 251 252 return; 253 } 254 255 static int omninet_write(struct tty_struct *tty, struct usb_serial_port *port, 256 const unsigned char *buf, int count) 257 { 258 struct usb_serial *serial = port->serial; 259 struct usb_serial_port *wport = serial->port[1]; 260 261 struct omninet_data *od = usb_get_serial_port_data(port); 262 struct omninet_header *header = (struct omninet_header *) 263 wport->write_urb->transfer_buffer; 264 265 int result; 266 267 dbg("%s - port %d", __func__, port->number); 268 269 if (count == 0) { 270 dbg("%s - write request of 0 bytes", __func__); 271 return 0; 272 } 273 274 spin_lock_bh(&wport->lock); 275 if (wport->write_urb_busy) { 276 spin_unlock_bh(&wport->lock); 277 dbg("%s - already writing", __func__); 278 return 0; 279 } 280 wport->write_urb_busy = 1; 281 spin_unlock_bh(&wport->lock); 282 283 count = (count > OMNINET_BULKOUTSIZE) ? OMNINET_BULKOUTSIZE : count; 284 285 memcpy(wport->write_urb->transfer_buffer + OMNINET_DATAOFFSET, 286 buf, count); 287 288 usb_serial_debug_data(debug, &port->dev, __func__, count, 289 wport->write_urb->transfer_buffer); 290 291 header->oh_seq = od->od_outseq++; 292 header->oh_len = count; 293 header->oh_xxx = 0x03; 294 header->oh_pad = 0x00; 295 296 /* send the data out the bulk port, always 64 bytes */ 297 wport->write_urb->transfer_buffer_length = 64; 298 299 wport->write_urb->dev = serial->dev; 300 result = usb_submit_urb(wport->write_urb, GFP_ATOMIC); 301 if (result) { 302 wport->write_urb_busy = 0; 303 dev_err(&port->dev, 304 "%s - failed submitting write urb, error %d\n", 305 __func__, result); 306 } else 307 result = count; 308 309 return result; 310 } 311 312 313 static int omninet_write_room(struct tty_struct *tty) 314 { 315 struct usb_serial_port *port = tty->driver_data; 316 struct usb_serial *serial = port->serial; 317 struct usb_serial_port *wport = serial->port[1]; 318 319 int room = 0; /* Default: no room */ 320 321 /* FIXME: no consistent locking for write_urb_busy */ 322 if (wport->write_urb_busy) 323 room = wport->bulk_out_size - OMNINET_HEADERLEN; 324 325 dbg("%s - returns %d", __func__, room); 326 327 return room; 328 } 329 330 static void omninet_write_bulk_callback(struct urb *urb) 331 { 332 /* struct omninet_header *header = (struct omninet_header *) 333 urb->transfer_buffer; */ 334 struct usb_serial_port *port = urb->context; 335 int status = urb->status; 336 337 dbg("%s - port %0x\n", __func__, port->number); 338 339 port->write_urb_busy = 0; 340 if (status) { 341 dbg("%s - nonzero write bulk status received: %d", 342 __func__, status); 343 return; 344 } 345 346 usb_serial_port_softint(port); 347 } 348 349 350 static void omninet_shutdown(struct usb_serial *serial) 351 { 352 struct usb_serial_port *wport = serial->port[1]; 353 struct usb_serial_port *port = serial->port[0]; 354 dbg("%s", __func__); 355 356 usb_kill_urb(wport->write_urb); 357 kfree(usb_get_serial_port_data(port)); 358 } 359 360 361 static int __init omninet_init(void) 362 { 363 int retval; 364 retval = usb_serial_register(&zyxel_omninet_device); 365 if (retval) 366 goto failed_usb_serial_register; 367 retval = usb_register(&omninet_driver); 368 if (retval) 369 goto failed_usb_register; 370 printk(KERN_INFO KBUILD_MODNAME ": " DRIVER_VERSION ":" 371 DRIVER_DESC "\n"); 372 return 0; 373 failed_usb_register: 374 usb_serial_deregister(&zyxel_omninet_device); 375 failed_usb_serial_register: 376 return retval; 377 } 378 379 380 static void __exit omninet_exit(void) 381 { 382 usb_deregister(&omninet_driver); 383 usb_serial_deregister(&zyxel_omninet_device); 384 } 385 386 387 module_init(omninet_init); 388 module_exit(omninet_exit); 389 390 MODULE_AUTHOR(DRIVER_AUTHOR); 391 MODULE_DESCRIPTION(DRIVER_DESC); 392 MODULE_LICENSE("GPL"); 393 394 module_param(debug, bool, S_IRUGO | S_IWUSR); 395 MODULE_PARM_DESC(debug, "Debug enabled or not"); 396