1 // SPDX-License-Identifier: GPL-2.0 2 /* 3 * usb-serial driver for Quatech SSU-100 4 * 5 * based on ftdi_sio.c and the original serqt_usb.c from Quatech 6 * 7 */ 8 9 #include <linux/errno.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 int ret; 85 86 ret = usb_control_msg(dev, usb_rcvctrlpipe(dev, 0), 87 QT_SET_GET_DEVICE, 0xc0, 0, 0, 88 data, 3, 300); 89 if (ret < 3) { 90 if (ret >= 0) 91 ret = -EIO; 92 } 93 94 return ret; 95 } 96 97 static inline int ssu100_getregister(struct usb_device *dev, 98 unsigned short uart, 99 unsigned short reg, 100 u8 *data) 101 { 102 int ret; 103 104 ret = usb_control_msg(dev, usb_rcvctrlpipe(dev, 0), 105 QT_SET_GET_REGISTER, 0xc0, reg, 106 uart, data, sizeof(*data), 300); 107 if (ret < (int)sizeof(*data)) { 108 if (ret >= 0) 109 ret = -EIO; 110 } 111 112 return ret; 113 } 114 115 116 static inline int ssu100_setregister(struct usb_device *dev, 117 unsigned short uart, 118 unsigned short reg, 119 u16 data) 120 { 121 u16 value = (data << 8) | reg; 122 123 return usb_control_msg(dev, usb_sndctrlpipe(dev, 0), 124 QT_SET_GET_REGISTER, 0x40, value, uart, 125 NULL, 0, 300); 126 127 } 128 129 #define set_mctrl(dev, set) update_mctrl((dev), (set), 0) 130 #define clear_mctrl(dev, clear) update_mctrl((dev), 0, (clear)) 131 132 /* these do not deal with device that have more than 1 port */ 133 static inline int update_mctrl(struct usb_device *dev, unsigned int set, 134 unsigned int clear) 135 { 136 unsigned urb_value; 137 int result; 138 139 if (((set | clear) & (TIOCM_DTR | TIOCM_RTS)) == 0) { 140 dev_dbg(&dev->dev, "%s - DTR|RTS not being set|cleared\n", __func__); 141 return 0; /* no change */ 142 } 143 144 clear &= ~set; /* 'set' takes precedence over 'clear' */ 145 urb_value = 0; 146 if (set & TIOCM_DTR) 147 urb_value |= UART_MCR_DTR; 148 if (set & TIOCM_RTS) 149 urb_value |= UART_MCR_RTS; 150 151 result = ssu100_setregister(dev, 0, UART_MCR, urb_value); 152 if (result < 0) 153 dev_dbg(&dev->dev, "%s Error from MODEM_CTRL urb\n", __func__); 154 155 return result; 156 } 157 158 static int ssu100_initdevice(struct usb_device *dev) 159 { 160 u8 *data; 161 int result = 0; 162 163 data = kzalloc(3, GFP_KERNEL); 164 if (!data) 165 return -ENOMEM; 166 167 result = ssu100_getdevice(dev, data); 168 if (result < 0) { 169 dev_dbg(&dev->dev, "%s - get_device failed %i\n", __func__, result); 170 goto out; 171 } 172 173 data[1] &= ~FULLPWRBIT; 174 175 result = ssu100_setdevice(dev, data); 176 if (result < 0) { 177 dev_dbg(&dev->dev, "%s - setdevice failed %i\n", __func__, result); 178 goto out; 179 } 180 181 result = ssu100_control_msg(dev, QT_GET_SET_PREBUF_TRIG_LVL, 128, 0); 182 if (result < 0) { 183 dev_dbg(&dev->dev, "%s - set prebuffer level failed %i\n", __func__, result); 184 goto out; 185 } 186 187 result = ssu100_control_msg(dev, QT_SET_ATF, ATC_DISABLED, 0); 188 if (result < 0) { 189 dev_dbg(&dev->dev, "%s - set ATFprebuffer level failed %i\n", __func__, result); 190 goto out; 191 } 192 193 result = ssu100_getdevice(dev, data); 194 if (result < 0) { 195 dev_dbg(&dev->dev, "%s - get_device failed %i\n", __func__, result); 196 goto out; 197 } 198 199 data[0] &= ~(RR_BITS | DUPMODE_BITS); 200 data[0] |= CLKS_X4; 201 data[1] &= ~(LOOPMODE_BITS); 202 data[1] |= RS232_MODE; 203 204 result = ssu100_setdevice(dev, data); 205 if (result < 0) { 206 dev_dbg(&dev->dev, "%s - setdevice failed %i\n", __func__, result); 207 goto out; 208 } 209 210 out: kfree(data); 211 return result; 212 213 } 214 215 216 static void ssu100_set_termios(struct tty_struct *tty, 217 struct usb_serial_port *port, 218 struct ktermios *old_termios) 219 { 220 struct usb_device *dev = port->serial->dev; 221 struct ktermios *termios = &tty->termios; 222 u16 baud, divisor, remainder; 223 unsigned int cflag = termios->c_cflag; 224 u16 urb_value = 0; /* will hold the new flags */ 225 int result; 226 227 if (cflag & PARENB) { 228 if (cflag & PARODD) 229 urb_value |= UART_LCR_PARITY; 230 else 231 urb_value |= SERIAL_EVEN_PARITY; 232 } 233 234 switch (cflag & CSIZE) { 235 case CS5: 236 urb_value |= UART_LCR_WLEN5; 237 break; 238 case CS6: 239 urb_value |= UART_LCR_WLEN6; 240 break; 241 case CS7: 242 urb_value |= UART_LCR_WLEN7; 243 break; 244 default: 245 case CS8: 246 urb_value |= UART_LCR_WLEN8; 247 break; 248 } 249 250 baud = tty_get_baud_rate(tty); 251 if (!baud) 252 baud = 9600; 253 254 dev_dbg(&port->dev, "%s - got baud = %d\n", __func__, baud); 255 256 257 divisor = MAX_BAUD_RATE / baud; 258 remainder = MAX_BAUD_RATE % baud; 259 if (((remainder * 2) >= baud) && (baud != 110)) 260 divisor++; 261 262 urb_value = urb_value << 8; 263 264 result = ssu100_control_msg(dev, QT_GET_SET_UART, divisor, urb_value); 265 if (result < 0) 266 dev_dbg(&port->dev, "%s - set uart failed\n", __func__); 267 268 if (cflag & CRTSCTS) 269 result = ssu100_control_msg(dev, QT_HW_FLOW_CONTROL_MASK, 270 SERIAL_CRTSCTS, 0); 271 else 272 result = ssu100_control_msg(dev, QT_HW_FLOW_CONTROL_MASK, 273 0, 0); 274 if (result < 0) 275 dev_dbg(&port->dev, "%s - set HW flow control failed\n", __func__); 276 277 if (I_IXOFF(tty) || I_IXON(tty)) { 278 u16 x = ((u16)(START_CHAR(tty) << 8) | (u16)(STOP_CHAR(tty))); 279 280 result = ssu100_control_msg(dev, QT_SW_FLOW_CONTROL_MASK, 281 x, 0); 282 } else 283 result = ssu100_control_msg(dev, QT_SW_FLOW_CONTROL_MASK, 284 0, 0); 285 286 if (result < 0) 287 dev_dbg(&port->dev, "%s - set SW flow control failed\n", __func__); 288 289 } 290 291 292 static int ssu100_open(struct tty_struct *tty, struct usb_serial_port *port) 293 { 294 struct usb_device *dev = port->serial->dev; 295 struct ssu100_port_private *priv = usb_get_serial_port_data(port); 296 u8 *data; 297 int result; 298 unsigned long flags; 299 300 data = kzalloc(2, GFP_KERNEL); 301 if (!data) 302 return -ENOMEM; 303 304 result = usb_control_msg(dev, usb_rcvctrlpipe(dev, 0), 305 QT_OPEN_CLOSE_CHANNEL, 306 QT_TRANSFER_IN, 0x01, 307 0, data, 2, 300); 308 if (result < 2) { 309 dev_dbg(&port->dev, "%s - open failed %i\n", __func__, result); 310 if (result >= 0) 311 result = -EIO; 312 kfree(data); 313 return result; 314 } 315 316 spin_lock_irqsave(&priv->status_lock, flags); 317 priv->shadowLSR = data[0]; 318 priv->shadowMSR = data[1]; 319 spin_unlock_irqrestore(&priv->status_lock, flags); 320 321 kfree(data); 322 323 /* set to 9600 */ 324 result = ssu100_control_msg(dev, QT_GET_SET_UART, 0x30, 0x0300); 325 if (result < 0) 326 dev_dbg(&port->dev, "%s - set uart failed\n", __func__); 327 328 if (tty) 329 ssu100_set_termios(tty, port, &tty->termios); 330 331 return usb_serial_generic_open(tty, port); 332 } 333 334 static int ssu100_attach(struct usb_serial *serial) 335 { 336 return ssu100_initdevice(serial->dev); 337 } 338 339 static int ssu100_port_probe(struct usb_serial_port *port) 340 { 341 struct ssu100_port_private *priv; 342 343 priv = kzalloc(sizeof(*priv), GFP_KERNEL); 344 if (!priv) 345 return -ENOMEM; 346 347 spin_lock_init(&priv->status_lock); 348 349 usb_set_serial_port_data(port, priv); 350 351 return 0; 352 } 353 354 static void ssu100_port_remove(struct usb_serial_port *port) 355 { 356 struct ssu100_port_private *priv; 357 358 priv = usb_get_serial_port_data(port); 359 kfree(priv); 360 } 361 362 static int ssu100_tiocmget(struct tty_struct *tty) 363 { 364 struct usb_serial_port *port = tty->driver_data; 365 struct usb_device *dev = port->serial->dev; 366 u8 *d; 367 int r; 368 369 d = kzalloc(2, GFP_KERNEL); 370 if (!d) 371 return -ENOMEM; 372 373 r = ssu100_getregister(dev, 0, UART_MCR, d); 374 if (r < 0) 375 goto mget_out; 376 377 r = ssu100_getregister(dev, 0, UART_MSR, d+1); 378 if (r < 0) 379 goto mget_out; 380 381 r = (d[0] & UART_MCR_DTR ? TIOCM_DTR : 0) | 382 (d[0] & UART_MCR_RTS ? TIOCM_RTS : 0) | 383 (d[1] & UART_MSR_CTS ? TIOCM_CTS : 0) | 384 (d[1] & UART_MSR_DCD ? TIOCM_CAR : 0) | 385 (d[1] & UART_MSR_RI ? TIOCM_RI : 0) | 386 (d[1] & UART_MSR_DSR ? TIOCM_DSR : 0); 387 388 mget_out: 389 kfree(d); 390 return r; 391 } 392 393 static int ssu100_tiocmset(struct tty_struct *tty, 394 unsigned int set, unsigned int clear) 395 { 396 struct usb_serial_port *port = tty->driver_data; 397 struct usb_device *dev = port->serial->dev; 398 399 return update_mctrl(dev, set, clear); 400 } 401 402 static void ssu100_dtr_rts(struct usb_serial_port *port, int on) 403 { 404 struct usb_device *dev = port->serial->dev; 405 406 /* Disable flow control */ 407 if (!on) { 408 if (ssu100_setregister(dev, 0, UART_MCR, 0) < 0) 409 dev_err(&port->dev, "error from flowcontrol urb\n"); 410 } 411 /* drop RTS and DTR */ 412 if (on) 413 set_mctrl(dev, TIOCM_DTR | TIOCM_RTS); 414 else 415 clear_mctrl(dev, TIOCM_DTR | TIOCM_RTS); 416 } 417 418 static void ssu100_update_msr(struct usb_serial_port *port, u8 msr) 419 { 420 struct ssu100_port_private *priv = usb_get_serial_port_data(port); 421 unsigned long flags; 422 423 spin_lock_irqsave(&priv->status_lock, flags); 424 priv->shadowMSR = msr; 425 spin_unlock_irqrestore(&priv->status_lock, flags); 426 427 if (msr & UART_MSR_ANY_DELTA) { 428 /* update input line counters */ 429 if (msr & UART_MSR_DCTS) 430 port->icount.cts++; 431 if (msr & UART_MSR_DDSR) 432 port->icount.dsr++; 433 if (msr & UART_MSR_DDCD) 434 port->icount.dcd++; 435 if (msr & UART_MSR_TERI) 436 port->icount.rng++; 437 wake_up_interruptible(&port->port.delta_msr_wait); 438 } 439 } 440 441 static void ssu100_update_lsr(struct usb_serial_port *port, u8 lsr, 442 char *tty_flag) 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->shadowLSR = lsr; 449 spin_unlock_irqrestore(&priv->status_lock, flags); 450 451 *tty_flag = TTY_NORMAL; 452 if (lsr & UART_LSR_BRK_ERROR_BITS) { 453 /* we always want to update icount, but we only want to 454 * update tty_flag for one case */ 455 if (lsr & UART_LSR_BI) { 456 port->icount.brk++; 457 *tty_flag = TTY_BREAK; 458 usb_serial_handle_break(port); 459 } 460 if (lsr & UART_LSR_PE) { 461 port->icount.parity++; 462 if (*tty_flag == TTY_NORMAL) 463 *tty_flag = TTY_PARITY; 464 } 465 if (lsr & UART_LSR_FE) { 466 port->icount.frame++; 467 if (*tty_flag == TTY_NORMAL) 468 *tty_flag = TTY_FRAME; 469 } 470 if (lsr & UART_LSR_OE) { 471 port->icount.overrun++; 472 tty_insert_flip_char(&port->port, 0, TTY_OVERRUN); 473 } 474 } 475 476 } 477 478 static void ssu100_process_read_urb(struct urb *urb) 479 { 480 struct usb_serial_port *port = urb->context; 481 char *packet = urb->transfer_buffer; 482 char flag = TTY_NORMAL; 483 u32 len = urb->actual_length; 484 int i; 485 char *ch; 486 487 if ((len >= 4) && 488 (packet[0] == 0x1b) && (packet[1] == 0x1b) && 489 ((packet[2] == 0x00) || (packet[2] == 0x01))) { 490 if (packet[2] == 0x00) 491 ssu100_update_lsr(port, packet[3], &flag); 492 if (packet[2] == 0x01) 493 ssu100_update_msr(port, packet[3]); 494 495 len -= 4; 496 ch = packet + 4; 497 } else 498 ch = packet; 499 500 if (!len) 501 return; /* status only */ 502 503 if (port->sysrq) { 504 for (i = 0; i < len; i++, ch++) { 505 if (!usb_serial_handle_sysrq_char(port, *ch)) 506 tty_insert_flip_char(&port->port, *ch, flag); 507 } 508 } else { 509 tty_insert_flip_string_fixed_flag(&port->port, ch, flag, len); 510 } 511 512 tty_flip_buffer_push(&port->port); 513 } 514 515 static struct usb_serial_driver ssu100_device = { 516 .driver = { 517 .owner = THIS_MODULE, 518 .name = "ssu100", 519 }, 520 .description = DRIVER_DESC, 521 .id_table = id_table, 522 .num_ports = 1, 523 .open = ssu100_open, 524 .attach = ssu100_attach, 525 .port_probe = ssu100_port_probe, 526 .port_remove = ssu100_port_remove, 527 .dtr_rts = ssu100_dtr_rts, 528 .process_read_urb = ssu100_process_read_urb, 529 .tiocmget = ssu100_tiocmget, 530 .tiocmset = ssu100_tiocmset, 531 .tiocmiwait = usb_serial_generic_tiocmiwait, 532 .get_icount = usb_serial_generic_get_icount, 533 .set_termios = ssu100_set_termios, 534 }; 535 536 static struct usb_serial_driver * const serial_drivers[] = { 537 &ssu100_device, NULL 538 }; 539 540 module_usb_serial_driver(serial_drivers, id_table); 541 542 MODULE_DESCRIPTION(DRIVER_DESC); 543 MODULE_LICENSE("GPL v2"); 544