1 // SPDX-License-Identifier: GPL-2.0
3 * usb-serial driver for Quatech SSU-100
5 * based on ftdi_sio.c and the original serqt_usb.c from Quatech
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>
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
31 #define SERIAL_MSR_MASK 0xf0
33 #define SERIAL_CRTSCTS ((UART_MCR_RTS << 8) | UART_MSR_CTS)
35 #define SERIAL_EVEN_PARITY (UART_LCR_PARITY | UART_LCR_EPAR)
37 #define MAX_BAUD_RATE 460800
39 #define ATC_DISABLED 0x00
40 #define DUPMODE_BITS 0xc0
42 #define LOOPMODE_BITS 0x41
43 #define RS232_MODE 0x00
44 #define RTSCTS_TO_CONNECTOR 0x40
46 #define FULLPWRBIT 0x00000080
47 #define NEXT_BOARD_POWER_BIT 0x00000004
49 #define DRIVER_DESC "Quatech SSU-100 USB to Serial Driver"
51 #define USB_VENDOR_ID_QUATECH 0x061d /* Quatech VID */
52 #define QUATECH_SSU100 0xC020 /* SSU100 */
54 static const struct usb_device_id id_table[] = {
55 {USB_DEVICE(USB_VENDOR_ID_QUATECH, QUATECH_SSU100)},
56 {} /* Terminating entry */
58 MODULE_DEVICE_TABLE(usb, id_table);
60 struct ssu100_port_private {
61 spinlock_t status_lock;
66 static inline int ssu100_control_msg(struct usb_device *dev,
67 u8 request, u16 data, u16 index)
69 return usb_control_msg(dev, usb_sndctrlpipe(dev, 0),
70 request, 0x40, data, index,
74 static inline int ssu100_setdevice(struct usb_device *dev, u8 *data)
76 u16 x = ((u16)(data[1] << 8) | (u16)(data[0]));
78 return ssu100_control_msg(dev, QT_SET_GET_DEVICE, x, 0);
82 static inline int ssu100_getdevice(struct usb_device *dev, u8 *data)
86 ret = usb_control_msg(dev, usb_rcvctrlpipe(dev, 0),
87 QT_SET_GET_DEVICE, 0xc0, 0, 0,
97 static inline int ssu100_getregister(struct usb_device *dev,
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)) {
116 static inline int ssu100_setregister(struct usb_device *dev,
121 u16 value = (data << 8) | reg;
123 return usb_control_msg(dev, usb_sndctrlpipe(dev, 0),
124 QT_SET_GET_REGISTER, 0x40, value, uart,
129 #define set_mctrl(dev, set) update_mctrl((dev), (set), 0)
130 #define clear_mctrl(dev, clear) update_mctrl((dev), 0, (clear))
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,
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 */
144 clear &= ~set; /* 'set' takes precedence over 'clear' */
147 urb_value |= UART_MCR_DTR;
149 urb_value |= UART_MCR_RTS;
151 result = ssu100_setregister(dev, 0, UART_MCR, urb_value);
153 dev_dbg(&dev->dev, "%s Error from MODEM_CTRL urb\n", __func__);
158 static int ssu100_initdevice(struct usb_device *dev)
163 data = kzalloc(3, GFP_KERNEL);
167 result = ssu100_getdevice(dev, data);
169 dev_dbg(&dev->dev, "%s - get_device failed %i\n", __func__, result);
173 data[1] &= ~FULLPWRBIT;
175 result = ssu100_setdevice(dev, data);
177 dev_dbg(&dev->dev, "%s - setdevice failed %i\n", __func__, result);
181 result = ssu100_control_msg(dev, QT_GET_SET_PREBUF_TRIG_LVL, 128, 0);
183 dev_dbg(&dev->dev, "%s - set prebuffer level failed %i\n", __func__, result);
187 result = ssu100_control_msg(dev, QT_SET_ATF, ATC_DISABLED, 0);
189 dev_dbg(&dev->dev, "%s - set ATFprebuffer level failed %i\n", __func__, result);
193 result = ssu100_getdevice(dev, data);
195 dev_dbg(&dev->dev, "%s - get_device failed %i\n", __func__, result);
199 data[0] &= ~(RR_BITS | DUPMODE_BITS);
201 data[1] &= ~(LOOPMODE_BITS);
202 data[1] |= RS232_MODE;
204 result = ssu100_setdevice(dev, data);
206 dev_dbg(&dev->dev, "%s - setdevice failed %i\n", __func__, result);
216 static void ssu100_set_termios(struct tty_struct *tty,
217 struct usb_serial_port *port,
218 struct ktermios *old_termios)
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 */
227 if (cflag & PARENB) {
229 urb_value |= UART_LCR_PARITY;
231 urb_value |= SERIAL_EVEN_PARITY;
234 switch (cflag & CSIZE) {
236 urb_value |= UART_LCR_WLEN5;
239 urb_value |= UART_LCR_WLEN6;
242 urb_value |= UART_LCR_WLEN7;
246 urb_value |= UART_LCR_WLEN8;
250 baud = tty_get_baud_rate(tty);
254 dev_dbg(&port->dev, "%s - got baud = %d\n", __func__, baud);
257 divisor = MAX_BAUD_RATE / baud;
258 remainder = MAX_BAUD_RATE % baud;
259 if (((remainder * 2) >= baud) && (baud != 110))
262 urb_value = urb_value << 8;
264 result = ssu100_control_msg(dev, QT_GET_SET_UART, divisor, urb_value);
266 dev_dbg(&port->dev, "%s - set uart failed\n", __func__);
269 result = ssu100_control_msg(dev, QT_HW_FLOW_CONTROL_MASK,
272 result = ssu100_control_msg(dev, QT_HW_FLOW_CONTROL_MASK,
275 dev_dbg(&port->dev, "%s - set HW flow control failed\n", __func__);
277 if (I_IXOFF(tty) || I_IXON(tty)) {
278 u16 x = ((u16)(START_CHAR(tty) << 8) | (u16)(STOP_CHAR(tty)));
280 result = ssu100_control_msg(dev, QT_SW_FLOW_CONTROL_MASK,
283 result = ssu100_control_msg(dev, QT_SW_FLOW_CONTROL_MASK,
287 dev_dbg(&port->dev, "%s - set SW flow control failed\n", __func__);
292 static int ssu100_open(struct tty_struct *tty, struct usb_serial_port *port)
294 struct usb_device *dev = port->serial->dev;
295 struct ssu100_port_private *priv = usb_get_serial_port_data(port);
300 data = kzalloc(2, GFP_KERNEL);
304 result = usb_control_msg(dev, usb_rcvctrlpipe(dev, 0),
305 QT_OPEN_CLOSE_CHANNEL,
306 QT_TRANSFER_IN, 0x01,
309 dev_dbg(&port->dev, "%s - open failed %i\n", __func__, result);
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);
324 result = ssu100_control_msg(dev, QT_GET_SET_UART, 0x30, 0x0300);
326 dev_dbg(&port->dev, "%s - set uart failed\n", __func__);
329 ssu100_set_termios(tty, port, &tty->termios);
331 return usb_serial_generic_open(tty, port);
334 static int get_serial_info(struct usb_serial_port *port,
335 struct serial_struct __user *retinfo)
337 struct serial_struct tmp;
339 memset(&tmp, 0, sizeof(tmp));
340 tmp.line = port->minor;
343 tmp.xmit_fifo_size = port->bulk_out_size;
344 tmp.baud_base = 9600;
345 tmp.close_delay = 5*HZ;
346 tmp.closing_wait = 30*HZ;
348 if (copy_to_user(retinfo, &tmp, sizeof(*retinfo)))
353 static int ssu100_ioctl(struct tty_struct *tty,
354 unsigned int cmd, unsigned long arg)
356 struct usb_serial_port *port = tty->driver_data;
360 return get_serial_info(port,
361 (struct serial_struct __user *) arg);
369 static int ssu100_attach(struct usb_serial *serial)
371 return ssu100_initdevice(serial->dev);
374 static int ssu100_port_probe(struct usb_serial_port *port)
376 struct ssu100_port_private *priv;
378 priv = kzalloc(sizeof(*priv), GFP_KERNEL);
382 spin_lock_init(&priv->status_lock);
384 usb_set_serial_port_data(port, priv);
389 static int ssu100_port_remove(struct usb_serial_port *port)
391 struct ssu100_port_private *priv;
393 priv = usb_get_serial_port_data(port);
399 static int ssu100_tiocmget(struct tty_struct *tty)
401 struct usb_serial_port *port = tty->driver_data;
402 struct usb_device *dev = port->serial->dev;
406 d = kzalloc(2, GFP_KERNEL);
410 r = ssu100_getregister(dev, 0, UART_MCR, d);
414 r = ssu100_getregister(dev, 0, UART_MSR, d+1);
418 r = (d[0] & UART_MCR_DTR ? TIOCM_DTR : 0) |
419 (d[0] & UART_MCR_RTS ? TIOCM_RTS : 0) |
420 (d[1] & UART_MSR_CTS ? TIOCM_CTS : 0) |
421 (d[1] & UART_MSR_DCD ? TIOCM_CAR : 0) |
422 (d[1] & UART_MSR_RI ? TIOCM_RI : 0) |
423 (d[1] & UART_MSR_DSR ? TIOCM_DSR : 0);
430 static int ssu100_tiocmset(struct tty_struct *tty,
431 unsigned int set, unsigned int clear)
433 struct usb_serial_port *port = tty->driver_data;
434 struct usb_device *dev = port->serial->dev;
436 return update_mctrl(dev, set, clear);
439 static void ssu100_dtr_rts(struct usb_serial_port *port, int on)
441 struct usb_device *dev = port->serial->dev;
443 /* Disable flow control */
445 if (ssu100_setregister(dev, 0, UART_MCR, 0) < 0)
446 dev_err(&port->dev, "error from flowcontrol urb\n");
448 /* drop RTS and DTR */
450 set_mctrl(dev, TIOCM_DTR | TIOCM_RTS);
452 clear_mctrl(dev, TIOCM_DTR | TIOCM_RTS);
455 static void ssu100_update_msr(struct usb_serial_port *port, u8 msr)
457 struct ssu100_port_private *priv = usb_get_serial_port_data(port);
460 spin_lock_irqsave(&priv->status_lock, flags);
461 priv->shadowMSR = msr;
462 spin_unlock_irqrestore(&priv->status_lock, flags);
464 if (msr & UART_MSR_ANY_DELTA) {
465 /* update input line counters */
466 if (msr & UART_MSR_DCTS)
468 if (msr & UART_MSR_DDSR)
470 if (msr & UART_MSR_DDCD)
472 if (msr & UART_MSR_TERI)
474 wake_up_interruptible(&port->port.delta_msr_wait);
478 static void ssu100_update_lsr(struct usb_serial_port *port, u8 lsr,
481 struct ssu100_port_private *priv = usb_get_serial_port_data(port);
484 spin_lock_irqsave(&priv->status_lock, flags);
485 priv->shadowLSR = lsr;
486 spin_unlock_irqrestore(&priv->status_lock, flags);
488 *tty_flag = TTY_NORMAL;
489 if (lsr & UART_LSR_BRK_ERROR_BITS) {
490 /* we always want to update icount, but we only want to
491 * update tty_flag for one case */
492 if (lsr & UART_LSR_BI) {
494 *tty_flag = TTY_BREAK;
495 usb_serial_handle_break(port);
497 if (lsr & UART_LSR_PE) {
498 port->icount.parity++;
499 if (*tty_flag == TTY_NORMAL)
500 *tty_flag = TTY_PARITY;
502 if (lsr & UART_LSR_FE) {
503 port->icount.frame++;
504 if (*tty_flag == TTY_NORMAL)
505 *tty_flag = TTY_FRAME;
507 if (lsr & UART_LSR_OE) {
508 port->icount.overrun++;
509 tty_insert_flip_char(&port->port, 0, TTY_OVERRUN);
515 static void ssu100_process_read_urb(struct urb *urb)
517 struct usb_serial_port *port = urb->context;
518 char *packet = (char *)urb->transfer_buffer;
519 char flag = TTY_NORMAL;
520 u32 len = urb->actual_length;
525 (packet[0] == 0x1b) && (packet[1] == 0x1b) &&
526 ((packet[2] == 0x00) || (packet[2] == 0x01))) {
527 if (packet[2] == 0x00)
528 ssu100_update_lsr(port, packet[3], &flag);
529 if (packet[2] == 0x01)
530 ssu100_update_msr(port, packet[3]);
538 return; /* status only */
540 if (port->port.console && port->sysrq) {
541 for (i = 0; i < len; i++, ch++) {
542 if (!usb_serial_handle_sysrq_char(port, *ch))
543 tty_insert_flip_char(&port->port, *ch, flag);
546 tty_insert_flip_string_fixed_flag(&port->port, ch, flag, len);
548 tty_flip_buffer_push(&port->port);
551 static struct usb_serial_driver ssu100_device = {
553 .owner = THIS_MODULE,
556 .description = DRIVER_DESC,
557 .id_table = id_table,
560 .attach = ssu100_attach,
561 .port_probe = ssu100_port_probe,
562 .port_remove = ssu100_port_remove,
563 .dtr_rts = ssu100_dtr_rts,
564 .process_read_urb = ssu100_process_read_urb,
565 .tiocmget = ssu100_tiocmget,
566 .tiocmset = ssu100_tiocmset,
567 .tiocmiwait = usb_serial_generic_tiocmiwait,
568 .get_icount = usb_serial_generic_get_icount,
569 .ioctl = ssu100_ioctl,
570 .set_termios = ssu100_set_termios,
573 static struct usb_serial_driver * const serial_drivers[] = {
577 module_usb_serial_driver(serial_drivers, id_table);
579 MODULE_DESCRIPTION(DRIVER_DESC);
580 MODULE_LICENSE("GPL v2");