1 /* 2 * usb-serial driver for Quatech SSU-100 3 * 4 * based on ftdi_sio.c and the original serqt_usb.c from Quatech 5 * 6 */ 7 8 #include <linux/errno.h> 9 #include <linux/init.h> 10 #include <linux/slab.h> 11 #include <linux/tty.h> 12 #include <linux/tty_driver.h> 13 #include <linux/tty_flip.h> 14 #include <linux/module.h> 15 #include <linux/serial.h> 16 #include <linux/usb.h> 17 #include <linux/usb/serial.h> 18 #include <linux/serial_reg.h> 19 #include <linux/uaccess.h> 20 21 #define QT_OPEN_CLOSE_CHANNEL 0xca 22 #define QT_SET_GET_DEVICE 0xc2 23 #define QT_SET_GET_REGISTER 0xc0 24 #define QT_GET_SET_PREBUF_TRIG_LVL 0xcc 25 #define QT_SET_ATF 0xcd 26 #define QT_GET_SET_UART 0xc1 27 #define QT_TRANSFER_IN 0xc0 28 #define QT_HW_FLOW_CONTROL_MASK 0xc5 29 #define QT_SW_FLOW_CONTROL_MASK 0xc6 30 31 #define SERIAL_MSR_MASK 0xf0 32 33 #define SERIAL_CRTSCTS ((UART_MCR_RTS << 8) | UART_MSR_CTS) 34 35 #define SERIAL_EVEN_PARITY (UART_LCR_PARITY | UART_LCR_EPAR) 36 37 #define MAX_BAUD_RATE 460800 38 39 #define ATC_DISABLED 0x00 40 #define DUPMODE_BITS 0xc0 41 #define RR_BITS 0x03 42 #define LOOPMODE_BITS 0x41 43 #define RS232_MODE 0x00 44 #define RTSCTS_TO_CONNECTOR 0x40 45 #define CLKS_X4 0x02 46 #define FULLPWRBIT 0x00000080 47 #define NEXT_BOARD_POWER_BIT 0x00000004 48 49 #define DRIVER_DESC "Quatech SSU-100 USB to Serial Driver" 50 51 #define USB_VENDOR_ID_QUATECH 0x061d /* Quatech VID */ 52 #define QUATECH_SSU100 0xC020 /* SSU100 */ 53 54 static const struct usb_device_id id_table[] = { 55 {USB_DEVICE(USB_VENDOR_ID_QUATECH, QUATECH_SSU100)}, 56 {} /* Terminating entry */ 57 }; 58 MODULE_DEVICE_TABLE(usb, id_table); 59 60 struct ssu100_port_private { 61 spinlock_t status_lock; 62 u8 shadowLSR; 63 u8 shadowMSR; 64 }; 65 66 static inline int ssu100_control_msg(struct usb_device *dev, 67 u8 request, u16 data, u16 index) 68 { 69 return usb_control_msg(dev, usb_sndctrlpipe(dev, 0), 70 request, 0x40, data, index, 71 NULL, 0, 300); 72 } 73 74 static inline int ssu100_setdevice(struct usb_device *dev, u8 *data) 75 { 76 u16 x = ((u16)(data[1] << 8) | (u16)(data[0])); 77 78 return ssu100_control_msg(dev, QT_SET_GET_DEVICE, x, 0); 79 } 80 81 82 static inline int ssu100_getdevice(struct usb_device *dev, u8 *data) 83 { 84 return usb_control_msg(dev, usb_rcvctrlpipe(dev, 0), 85 QT_SET_GET_DEVICE, 0xc0, 0, 0, 86 data, 3, 300); 87 } 88 89 static inline int ssu100_getregister(struct usb_device *dev, 90 unsigned short uart, 91 unsigned short reg, 92 u8 *data) 93 { 94 return usb_control_msg(dev, usb_rcvctrlpipe(dev, 0), 95 QT_SET_GET_REGISTER, 0xc0, reg, 96 uart, data, sizeof(*data), 300); 97 98 } 99 100 101 static inline int ssu100_setregister(struct usb_device *dev, 102 unsigned short uart, 103 unsigned short reg, 104 u16 data) 105 { 106 u16 value = (data << 8) | reg; 107 108 return usb_control_msg(dev, usb_sndctrlpipe(dev, 0), 109 QT_SET_GET_REGISTER, 0x40, value, uart, 110 NULL, 0, 300); 111 112 } 113 114 #define set_mctrl(dev, set) update_mctrl((dev), (set), 0) 115 #define clear_mctrl(dev, clear) update_mctrl((dev), 0, (clear)) 116 117 /* these do not deal with device that have more than 1 port */ 118 static inline int update_mctrl(struct usb_device *dev, unsigned int set, 119 unsigned int clear) 120 { 121 unsigned urb_value; 122 int result; 123 124 if (((set | clear) & (TIOCM_DTR | TIOCM_RTS)) == 0) { 125 dev_dbg(&dev->dev, "%s - DTR|RTS not being set|cleared\n", __func__); 126 return 0; /* no change */ 127 } 128 129 clear &= ~set; /* 'set' takes precedence over 'clear' */ 130 urb_value = 0; 131 if (set & TIOCM_DTR) 132 urb_value |= UART_MCR_DTR; 133 if (set & TIOCM_RTS) 134 urb_value |= UART_MCR_RTS; 135 136 result = ssu100_setregister(dev, 0, UART_MCR, urb_value); 137 if (result < 0) 138 dev_dbg(&dev->dev, "%s Error from MODEM_CTRL urb\n", __func__); 139 140 return result; 141 } 142 143 static int ssu100_initdevice(struct usb_device *dev) 144 { 145 u8 *data; 146 int result = 0; 147 148 data = kzalloc(3, GFP_KERNEL); 149 if (!data) 150 return -ENOMEM; 151 152 result = ssu100_getdevice(dev, data); 153 if (result < 0) { 154 dev_dbg(&dev->dev, "%s - get_device failed %i\n", __func__, result); 155 goto out; 156 } 157 158 data[1] &= ~FULLPWRBIT; 159 160 result = ssu100_setdevice(dev, data); 161 if (result < 0) { 162 dev_dbg(&dev->dev, "%s - setdevice failed %i\n", __func__, result); 163 goto out; 164 } 165 166 result = ssu100_control_msg(dev, QT_GET_SET_PREBUF_TRIG_LVL, 128, 0); 167 if (result < 0) { 168 dev_dbg(&dev->dev, "%s - set prebuffer level failed %i\n", __func__, result); 169 goto out; 170 } 171 172 result = ssu100_control_msg(dev, QT_SET_ATF, ATC_DISABLED, 0); 173 if (result < 0) { 174 dev_dbg(&dev->dev, "%s - set ATFprebuffer level failed %i\n", __func__, result); 175 goto out; 176 } 177 178 result = ssu100_getdevice(dev, data); 179 if (result < 0) { 180 dev_dbg(&dev->dev, "%s - get_device failed %i\n", __func__, result); 181 goto out; 182 } 183 184 data[0] &= ~(RR_BITS | DUPMODE_BITS); 185 data[0] |= CLKS_X4; 186 data[1] &= ~(LOOPMODE_BITS); 187 data[1] |= RS232_MODE; 188 189 result = ssu100_setdevice(dev, data); 190 if (result < 0) { 191 dev_dbg(&dev->dev, "%s - setdevice failed %i\n", __func__, result); 192 goto out; 193 } 194 195 out: kfree(data); 196 return result; 197 198 } 199 200 201 static void ssu100_set_termios(struct tty_struct *tty, 202 struct usb_serial_port *port, 203 struct ktermios *old_termios) 204 { 205 struct usb_device *dev = port->serial->dev; 206 struct ktermios *termios = &tty->termios; 207 u16 baud, divisor, remainder; 208 unsigned int cflag = termios->c_cflag; 209 u16 urb_value = 0; /* will hold the new flags */ 210 int result; 211 212 if (cflag & PARENB) { 213 if (cflag & PARODD) 214 urb_value |= UART_LCR_PARITY; 215 else 216 urb_value |= SERIAL_EVEN_PARITY; 217 } 218 219 switch (cflag & CSIZE) { 220 case CS5: 221 urb_value |= UART_LCR_WLEN5; 222 break; 223 case CS6: 224 urb_value |= UART_LCR_WLEN6; 225 break; 226 case CS7: 227 urb_value |= UART_LCR_WLEN7; 228 break; 229 default: 230 case CS8: 231 urb_value |= UART_LCR_WLEN8; 232 break; 233 } 234 235 baud = tty_get_baud_rate(tty); 236 if (!baud) 237 baud = 9600; 238 239 dev_dbg(&port->dev, "%s - got baud = %d\n", __func__, baud); 240 241 242 divisor = MAX_BAUD_RATE / baud; 243 remainder = MAX_BAUD_RATE % baud; 244 if (((remainder * 2) >= baud) && (baud != 110)) 245 divisor++; 246 247 urb_value = urb_value << 8; 248 249 result = ssu100_control_msg(dev, QT_GET_SET_UART, divisor, urb_value); 250 if (result < 0) 251 dev_dbg(&port->dev, "%s - set uart failed\n", __func__); 252 253 if (cflag & CRTSCTS) 254 result = ssu100_control_msg(dev, QT_HW_FLOW_CONTROL_MASK, 255 SERIAL_CRTSCTS, 0); 256 else 257 result = ssu100_control_msg(dev, QT_HW_FLOW_CONTROL_MASK, 258 0, 0); 259 if (result < 0) 260 dev_dbg(&port->dev, "%s - set HW flow control failed\n", __func__); 261 262 if (I_IXOFF(tty) || I_IXON(tty)) { 263 u16 x = ((u16)(START_CHAR(tty) << 8) | (u16)(STOP_CHAR(tty))); 264 265 result = ssu100_control_msg(dev, QT_SW_FLOW_CONTROL_MASK, 266 x, 0); 267 } else 268 result = ssu100_control_msg(dev, QT_SW_FLOW_CONTROL_MASK, 269 0, 0); 270 271 if (result < 0) 272 dev_dbg(&port->dev, "%s - set SW flow control failed\n", __func__); 273 274 } 275 276 277 static int ssu100_open(struct tty_struct *tty, struct usb_serial_port *port) 278 { 279 struct usb_device *dev = port->serial->dev; 280 struct ssu100_port_private *priv = usb_get_serial_port_data(port); 281 u8 *data; 282 int result; 283 unsigned long flags; 284 285 data = kzalloc(2, GFP_KERNEL); 286 if (!data) 287 return -ENOMEM; 288 289 result = usb_control_msg(dev, usb_rcvctrlpipe(dev, 0), 290 QT_OPEN_CLOSE_CHANNEL, 291 QT_TRANSFER_IN, 0x01, 292 0, data, 2, 300); 293 if (result < 0) { 294 dev_dbg(&port->dev, "%s - open failed %i\n", __func__, result); 295 kfree(data); 296 return result; 297 } 298 299 spin_lock_irqsave(&priv->status_lock, flags); 300 priv->shadowLSR = data[0]; 301 priv->shadowMSR = data[1]; 302 spin_unlock_irqrestore(&priv->status_lock, flags); 303 304 kfree(data); 305 306 /* set to 9600 */ 307 result = ssu100_control_msg(dev, QT_GET_SET_UART, 0x30, 0x0300); 308 if (result < 0) 309 dev_dbg(&port->dev, "%s - set uart failed\n", __func__); 310 311 if (tty) 312 ssu100_set_termios(tty, port, &tty->termios); 313 314 return usb_serial_generic_open(tty, port); 315 } 316 317 static int get_serial_info(struct usb_serial_port *port, 318 struct serial_struct __user *retinfo) 319 { 320 struct serial_struct tmp; 321 322 if (!retinfo) 323 return -EFAULT; 324 325 memset(&tmp, 0, sizeof(tmp)); 326 tmp.line = port->minor; 327 tmp.port = 0; 328 tmp.irq = 0; 329 tmp.flags = ASYNC_SKIP_TEST | ASYNC_AUTO_IRQ; 330 tmp.xmit_fifo_size = port->bulk_out_size; 331 tmp.baud_base = 9600; 332 tmp.close_delay = 5*HZ; 333 tmp.closing_wait = 30*HZ; 334 335 if (copy_to_user(retinfo, &tmp, sizeof(*retinfo))) 336 return -EFAULT; 337 return 0; 338 } 339 340 static int ssu100_ioctl(struct tty_struct *tty, 341 unsigned int cmd, unsigned long arg) 342 { 343 struct usb_serial_port *port = tty->driver_data; 344 345 switch (cmd) { 346 case TIOCGSERIAL: 347 return get_serial_info(port, 348 (struct serial_struct __user *) arg); 349 default: 350 break; 351 } 352 353 return -ENOIOCTLCMD; 354 } 355 356 static int ssu100_attach(struct usb_serial *serial) 357 { 358 return ssu100_initdevice(serial->dev); 359 } 360 361 static int ssu100_port_probe(struct usb_serial_port *port) 362 { 363 struct ssu100_port_private *priv; 364 365 priv = kzalloc(sizeof(*priv), GFP_KERNEL); 366 if (!priv) 367 return -ENOMEM; 368 369 spin_lock_init(&priv->status_lock); 370 371 usb_set_serial_port_data(port, priv); 372 373 return 0; 374 } 375 376 static int ssu100_port_remove(struct usb_serial_port *port) 377 { 378 struct ssu100_port_private *priv; 379 380 priv = usb_get_serial_port_data(port); 381 kfree(priv); 382 383 return 0; 384 } 385 386 static int ssu100_tiocmget(struct tty_struct *tty) 387 { 388 struct usb_serial_port *port = tty->driver_data; 389 struct usb_device *dev = port->serial->dev; 390 u8 *d; 391 int r; 392 393 d = kzalloc(2, GFP_KERNEL); 394 if (!d) 395 return -ENOMEM; 396 397 r = ssu100_getregister(dev, 0, UART_MCR, d); 398 if (r < 0) 399 goto mget_out; 400 401 r = ssu100_getregister(dev, 0, UART_MSR, d+1); 402 if (r < 0) 403 goto mget_out; 404 405 r = (d[0] & UART_MCR_DTR ? TIOCM_DTR : 0) | 406 (d[0] & UART_MCR_RTS ? TIOCM_RTS : 0) | 407 (d[1] & UART_MSR_CTS ? TIOCM_CTS : 0) | 408 (d[1] & UART_MSR_DCD ? TIOCM_CAR : 0) | 409 (d[1] & UART_MSR_RI ? TIOCM_RI : 0) | 410 (d[1] & UART_MSR_DSR ? TIOCM_DSR : 0); 411 412 mget_out: 413 kfree(d); 414 return r; 415 } 416 417 static int ssu100_tiocmset(struct tty_struct *tty, 418 unsigned int set, unsigned int clear) 419 { 420 struct usb_serial_port *port = tty->driver_data; 421 struct usb_device *dev = port->serial->dev; 422 423 return update_mctrl(dev, set, clear); 424 } 425 426 static void ssu100_dtr_rts(struct usb_serial_port *port, int on) 427 { 428 struct usb_device *dev = port->serial->dev; 429 430 /* Disable flow control */ 431 if (!on) { 432 if (ssu100_setregister(dev, 0, UART_MCR, 0) < 0) 433 dev_err(&port->dev, "error from flowcontrol urb\n"); 434 } 435 /* drop RTS and DTR */ 436 if (on) 437 set_mctrl(dev, TIOCM_DTR | TIOCM_RTS); 438 else 439 clear_mctrl(dev, TIOCM_DTR | TIOCM_RTS); 440 } 441 442 static void ssu100_update_msr(struct usb_serial_port *port, u8 msr) 443 { 444 struct ssu100_port_private *priv = usb_get_serial_port_data(port); 445 unsigned long flags; 446 447 spin_lock_irqsave(&priv->status_lock, flags); 448 priv->shadowMSR = msr; 449 spin_unlock_irqrestore(&priv->status_lock, flags); 450 451 if (msr & UART_MSR_ANY_DELTA) { 452 /* update input line counters */ 453 if (msr & UART_MSR_DCTS) 454 port->icount.cts++; 455 if (msr & UART_MSR_DDSR) 456 port->icount.dsr++; 457 if (msr & UART_MSR_DDCD) 458 port->icount.dcd++; 459 if (msr & UART_MSR_TERI) 460 port->icount.rng++; 461 wake_up_interruptible(&port->port.delta_msr_wait); 462 } 463 } 464 465 static void ssu100_update_lsr(struct usb_serial_port *port, u8 lsr, 466 char *tty_flag) 467 { 468 struct ssu100_port_private *priv = usb_get_serial_port_data(port); 469 unsigned long flags; 470 471 spin_lock_irqsave(&priv->status_lock, flags); 472 priv->shadowLSR = lsr; 473 spin_unlock_irqrestore(&priv->status_lock, flags); 474 475 *tty_flag = TTY_NORMAL; 476 if (lsr & UART_LSR_BRK_ERROR_BITS) { 477 /* we always want to update icount, but we only want to 478 * update tty_flag for one case */ 479 if (lsr & UART_LSR_BI) { 480 port->icount.brk++; 481 *tty_flag = TTY_BREAK; 482 usb_serial_handle_break(port); 483 } 484 if (lsr & UART_LSR_PE) { 485 port->icount.parity++; 486 if (*tty_flag == TTY_NORMAL) 487 *tty_flag = TTY_PARITY; 488 } 489 if (lsr & UART_LSR_FE) { 490 port->icount.frame++; 491 if (*tty_flag == TTY_NORMAL) 492 *tty_flag = TTY_FRAME; 493 } 494 if (lsr & UART_LSR_OE){ 495 port->icount.overrun++; 496 if (*tty_flag == TTY_NORMAL) 497 *tty_flag = TTY_OVERRUN; 498 } 499 } 500 501 } 502 503 static void ssu100_process_read_urb(struct urb *urb) 504 { 505 struct usb_serial_port *port = urb->context; 506 char *packet = (char *)urb->transfer_buffer; 507 char flag = TTY_NORMAL; 508 u32 len = urb->actual_length; 509 int i; 510 char *ch; 511 512 if ((len >= 4) && 513 (packet[0] == 0x1b) && (packet[1] == 0x1b) && 514 ((packet[2] == 0x00) || (packet[2] == 0x01))) { 515 if (packet[2] == 0x00) { 516 ssu100_update_lsr(port, packet[3], &flag); 517 if (flag == TTY_OVERRUN) 518 tty_insert_flip_char(&port->port, 0, 519 TTY_OVERRUN); 520 } 521 if (packet[2] == 0x01) 522 ssu100_update_msr(port, packet[3]); 523 524 len -= 4; 525 ch = packet + 4; 526 } else 527 ch = packet; 528 529 if (!len) 530 return; /* status only */ 531 532 if (port->port.console && port->sysrq) { 533 for (i = 0; i < len; i++, ch++) { 534 if (!usb_serial_handle_sysrq_char(port, *ch)) 535 tty_insert_flip_char(&port->port, *ch, flag); 536 } 537 } else 538 tty_insert_flip_string_fixed_flag(&port->port, ch, flag, len); 539 540 tty_flip_buffer_push(&port->port); 541 } 542 543 static struct usb_serial_driver ssu100_device = { 544 .driver = { 545 .owner = THIS_MODULE, 546 .name = "ssu100", 547 }, 548 .description = DRIVER_DESC, 549 .id_table = id_table, 550 .num_ports = 1, 551 .open = ssu100_open, 552 .attach = ssu100_attach, 553 .port_probe = ssu100_port_probe, 554 .port_remove = ssu100_port_remove, 555 .dtr_rts = ssu100_dtr_rts, 556 .process_read_urb = ssu100_process_read_urb, 557 .tiocmget = ssu100_tiocmget, 558 .tiocmset = ssu100_tiocmset, 559 .tiocmiwait = usb_serial_generic_tiocmiwait, 560 .get_icount = usb_serial_generic_get_icount, 561 .ioctl = ssu100_ioctl, 562 .set_termios = ssu100_set_termios, 563 }; 564 565 static struct usb_serial_driver * const serial_drivers[] = { 566 &ssu100_device, NULL 567 }; 568 569 module_usb_serial_driver(serial_drivers, id_table); 570 571 MODULE_DESCRIPTION(DRIVER_DESC); 572 MODULE_LICENSE("GPL"); 573