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 const 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 urb_value |= UART_LCR_WLEN(tty_get_char_size(cflag)); 235 236 baud = tty_get_baud_rate(tty); 237 if (!baud) 238 baud = 9600; 239 240 dev_dbg(&port->dev, "%s - got baud = %d\n", __func__, baud); 241 242 243 divisor = MAX_BAUD_RATE / baud; 244 remainder = MAX_BAUD_RATE % baud; 245 if (((remainder * 2) >= baud) && (baud != 110)) 246 divisor++; 247 248 urb_value = urb_value << 8; 249 250 result = ssu100_control_msg(dev, QT_GET_SET_UART, divisor, urb_value); 251 if (result < 0) 252 dev_dbg(&port->dev, "%s - set uart failed\n", __func__); 253 254 if (cflag & CRTSCTS) 255 result = ssu100_control_msg(dev, QT_HW_FLOW_CONTROL_MASK, 256 SERIAL_CRTSCTS, 0); 257 else 258 result = ssu100_control_msg(dev, QT_HW_FLOW_CONTROL_MASK, 259 0, 0); 260 if (result < 0) 261 dev_dbg(&port->dev, "%s - set HW flow control failed\n", __func__); 262 263 if (I_IXOFF(tty) || I_IXON(tty)) { 264 u16 x = ((u16)(START_CHAR(tty) << 8) | (u16)(STOP_CHAR(tty))); 265 266 result = ssu100_control_msg(dev, QT_SW_FLOW_CONTROL_MASK, 267 x, 0); 268 } else 269 result = ssu100_control_msg(dev, QT_SW_FLOW_CONTROL_MASK, 270 0, 0); 271 272 if (result < 0) 273 dev_dbg(&port->dev, "%s - set SW flow control failed\n", __func__); 274 275 } 276 277 278 static int ssu100_open(struct tty_struct *tty, struct usb_serial_port *port) 279 { 280 struct usb_device *dev = port->serial->dev; 281 struct ssu100_port_private *priv = usb_get_serial_port_data(port); 282 u8 *data; 283 int result; 284 unsigned long flags; 285 286 data = kzalloc(2, GFP_KERNEL); 287 if (!data) 288 return -ENOMEM; 289 290 result = usb_control_msg(dev, usb_rcvctrlpipe(dev, 0), 291 QT_OPEN_CLOSE_CHANNEL, 292 QT_TRANSFER_IN, 0x01, 293 0, data, 2, 300); 294 if (result < 2) { 295 dev_dbg(&port->dev, "%s - open failed %i\n", __func__, result); 296 if (result >= 0) 297 result = -EIO; 298 kfree(data); 299 return result; 300 } 301 302 spin_lock_irqsave(&priv->status_lock, flags); 303 priv->shadowLSR = data[0]; 304 priv->shadowMSR = data[1]; 305 spin_unlock_irqrestore(&priv->status_lock, flags); 306 307 kfree(data); 308 309 /* set to 9600 */ 310 result = ssu100_control_msg(dev, QT_GET_SET_UART, 0x30, 0x0300); 311 if (result < 0) 312 dev_dbg(&port->dev, "%s - set uart failed\n", __func__); 313 314 if (tty) 315 ssu100_set_termios(tty, port, &tty->termios); 316 317 return usb_serial_generic_open(tty, port); 318 } 319 320 static int ssu100_attach(struct usb_serial *serial) 321 { 322 return ssu100_initdevice(serial->dev); 323 } 324 325 static int ssu100_port_probe(struct usb_serial_port *port) 326 { 327 struct ssu100_port_private *priv; 328 329 priv = kzalloc(sizeof(*priv), GFP_KERNEL); 330 if (!priv) 331 return -ENOMEM; 332 333 spin_lock_init(&priv->status_lock); 334 335 usb_set_serial_port_data(port, priv); 336 337 return 0; 338 } 339 340 static void ssu100_port_remove(struct usb_serial_port *port) 341 { 342 struct ssu100_port_private *priv; 343 344 priv = usb_get_serial_port_data(port); 345 kfree(priv); 346 } 347 348 static int ssu100_tiocmget(struct tty_struct *tty) 349 { 350 struct usb_serial_port *port = tty->driver_data; 351 struct usb_device *dev = port->serial->dev; 352 u8 *d; 353 int r; 354 355 d = kzalloc(2, GFP_KERNEL); 356 if (!d) 357 return -ENOMEM; 358 359 r = ssu100_getregister(dev, 0, UART_MCR, d); 360 if (r < 0) 361 goto mget_out; 362 363 r = ssu100_getregister(dev, 0, UART_MSR, d+1); 364 if (r < 0) 365 goto mget_out; 366 367 r = (d[0] & UART_MCR_DTR ? TIOCM_DTR : 0) | 368 (d[0] & UART_MCR_RTS ? TIOCM_RTS : 0) | 369 (d[1] & UART_MSR_CTS ? TIOCM_CTS : 0) | 370 (d[1] & UART_MSR_DCD ? TIOCM_CAR : 0) | 371 (d[1] & UART_MSR_RI ? TIOCM_RI : 0) | 372 (d[1] & UART_MSR_DSR ? TIOCM_DSR : 0); 373 374 mget_out: 375 kfree(d); 376 return r; 377 } 378 379 static int ssu100_tiocmset(struct tty_struct *tty, 380 unsigned int set, unsigned int clear) 381 { 382 struct usb_serial_port *port = tty->driver_data; 383 struct usb_device *dev = port->serial->dev; 384 385 return update_mctrl(dev, set, clear); 386 } 387 388 static void ssu100_dtr_rts(struct usb_serial_port *port, int on) 389 { 390 struct usb_device *dev = port->serial->dev; 391 392 /* Disable flow control */ 393 if (!on) { 394 if (ssu100_setregister(dev, 0, UART_MCR, 0) < 0) 395 dev_err(&port->dev, "error from flowcontrol urb\n"); 396 } 397 /* drop RTS and DTR */ 398 if (on) 399 set_mctrl(dev, TIOCM_DTR | TIOCM_RTS); 400 else 401 clear_mctrl(dev, TIOCM_DTR | TIOCM_RTS); 402 } 403 404 static void ssu100_update_msr(struct usb_serial_port *port, u8 msr) 405 { 406 struct ssu100_port_private *priv = usb_get_serial_port_data(port); 407 unsigned long flags; 408 409 spin_lock_irqsave(&priv->status_lock, flags); 410 priv->shadowMSR = msr; 411 spin_unlock_irqrestore(&priv->status_lock, flags); 412 413 if (msr & UART_MSR_ANY_DELTA) { 414 /* update input line counters */ 415 if (msr & UART_MSR_DCTS) 416 port->icount.cts++; 417 if (msr & UART_MSR_DDSR) 418 port->icount.dsr++; 419 if (msr & UART_MSR_DDCD) 420 port->icount.dcd++; 421 if (msr & UART_MSR_TERI) 422 port->icount.rng++; 423 wake_up_interruptible(&port->port.delta_msr_wait); 424 } 425 } 426 427 static void ssu100_update_lsr(struct usb_serial_port *port, u8 lsr, 428 char *tty_flag) 429 { 430 struct ssu100_port_private *priv = usb_get_serial_port_data(port); 431 unsigned long flags; 432 433 spin_lock_irqsave(&priv->status_lock, flags); 434 priv->shadowLSR = lsr; 435 spin_unlock_irqrestore(&priv->status_lock, flags); 436 437 *tty_flag = TTY_NORMAL; 438 if (lsr & UART_LSR_BRK_ERROR_BITS) { 439 /* we always want to update icount, but we only want to 440 * update tty_flag for one case */ 441 if (lsr & UART_LSR_BI) { 442 port->icount.brk++; 443 *tty_flag = TTY_BREAK; 444 usb_serial_handle_break(port); 445 } 446 if (lsr & UART_LSR_PE) { 447 port->icount.parity++; 448 if (*tty_flag == TTY_NORMAL) 449 *tty_flag = TTY_PARITY; 450 } 451 if (lsr & UART_LSR_FE) { 452 port->icount.frame++; 453 if (*tty_flag == TTY_NORMAL) 454 *tty_flag = TTY_FRAME; 455 } 456 if (lsr & UART_LSR_OE) { 457 port->icount.overrun++; 458 tty_insert_flip_char(&port->port, 0, TTY_OVERRUN); 459 } 460 } 461 462 } 463 464 static void ssu100_process_read_urb(struct urb *urb) 465 { 466 struct usb_serial_port *port = urb->context; 467 char *packet = urb->transfer_buffer; 468 char flag = TTY_NORMAL; 469 u32 len = urb->actual_length; 470 int i; 471 char *ch; 472 473 if ((len >= 4) && 474 (packet[0] == 0x1b) && (packet[1] == 0x1b) && 475 ((packet[2] == 0x00) || (packet[2] == 0x01))) { 476 if (packet[2] == 0x00) 477 ssu100_update_lsr(port, packet[3], &flag); 478 if (packet[2] == 0x01) 479 ssu100_update_msr(port, packet[3]); 480 481 len -= 4; 482 ch = packet + 4; 483 } else 484 ch = packet; 485 486 if (!len) 487 return; /* status only */ 488 489 if (port->sysrq) { 490 for (i = 0; i < len; i++, ch++) { 491 if (!usb_serial_handle_sysrq_char(port, *ch)) 492 tty_insert_flip_char(&port->port, *ch, flag); 493 } 494 } else { 495 tty_insert_flip_string_fixed_flag(&port->port, ch, flag, len); 496 } 497 498 tty_flip_buffer_push(&port->port); 499 } 500 501 static struct usb_serial_driver ssu100_device = { 502 .driver = { 503 .owner = THIS_MODULE, 504 .name = "ssu100", 505 }, 506 .description = DRIVER_DESC, 507 .id_table = id_table, 508 .num_ports = 1, 509 .open = ssu100_open, 510 .attach = ssu100_attach, 511 .port_probe = ssu100_port_probe, 512 .port_remove = ssu100_port_remove, 513 .dtr_rts = ssu100_dtr_rts, 514 .process_read_urb = ssu100_process_read_urb, 515 .tiocmget = ssu100_tiocmget, 516 .tiocmset = ssu100_tiocmset, 517 .tiocmiwait = usb_serial_generic_tiocmiwait, 518 .get_icount = usb_serial_generic_get_icount, 519 .set_termios = ssu100_set_termios, 520 }; 521 522 static struct usb_serial_driver * const serial_drivers[] = { 523 &ssu100_device, NULL 524 }; 525 526 module_usb_serial_driver(serial_drivers, id_table); 527 528 MODULE_DESCRIPTION(DRIVER_DESC); 529 MODULE_LICENSE("GPL v2"); 530