1 // SPDX-License-Identifier: GPL-2.0
3  * usb-serial driver for Quatech SSU-100
15 #include <linux/serial.h>
17 #include <linux/usb/serial.h>
49 #define DRIVER_DESC "Quatech SSU-100 USB to Serial Driver"
91 			ret = -EIO;  in ssu100_getdevice()
109 			ret = -EIO;  in ssu100_getregister()
140 		dev_dbg(&dev->dev, "%s - DTR|RTS not being set|cleared\n", __func__);  in update_mctrl()
153 		dev_dbg(&dev->dev, "%s Error from MODEM_CTRL urb\n", __func__);  in update_mctrl()
165 		return -ENOMEM;  in ssu100_initdevice()
169 		dev_dbg(&dev->dev, "%s - get_device failed %i\n", __func__, result);  in ssu100_initdevice()
170 		goto out;  in ssu100_initdevice()
177 		dev_dbg(&dev->dev, "%s - setdevice failed %i\n", __func__, result);  in ssu100_initdevice()
178 		goto out;  in ssu100_initdevice()
183 		dev_dbg(&dev->dev, "%s - set prebuffer level failed %i\n", __func__, result);  in ssu100_initdevice()
184 		goto out;  in ssu100_initdevice()
189 		dev_dbg(&dev->dev, "%s - set ATFprebuffer level failed %i\n", __func__, result);  in ssu100_initdevice()
190 		goto out;  in ssu100_initdevice()
195 		dev_dbg(&dev->dev, "%s - get_device failed %i\n", __func__, result);  in ssu100_initdevice()
196 		goto out;  in ssu100_initdevice()
206 		dev_dbg(&dev->dev, "%s - setdevice failed %i\n", __func__, result);  in ssu100_initdevice()
207 		goto out;  in ssu100_initdevice()
210 out:	kfree(data);  in ssu100_initdevice()
220 	struct usb_device *dev = port->serial->dev;  in ssu100_set_termios()
221 	struct ktermios *termios = &tty->termios;  in ssu100_set_termios()
223 	unsigned int cflag = termios->c_cflag;  in ssu100_set_termios()
240 	dev_dbg(&port->dev, "%s - got baud = %d\n", __func__, baud);  in ssu100_set_termios()
252 		dev_dbg(&port->dev, "%s - set uart failed\n", __func__);  in ssu100_set_termios()
261 		dev_dbg(&port->dev, "%s - set HW flow control failed\n", __func__);  in ssu100_set_termios()
273 		dev_dbg(&port->dev, "%s - set SW flow control failed\n", __func__);  in ssu100_set_termios()
280 	struct usb_device *dev = port->serial->dev;  in ssu100_open()
288 		return -ENOMEM;  in ssu100_open()
295 		dev_dbg(&port->dev, "%s - open failed %i\n", __func__, result);  in ssu100_open()
297 			result = -EIO;  in ssu100_open()
302 	spin_lock_irqsave(&priv->status_lock, flags);  in ssu100_open()
303 	priv->shadowLSR = data[0];  in ssu100_open()
304 	priv->shadowMSR = data[1];  in ssu100_open()
305 	spin_unlock_irqrestore(&priv->status_lock, flags);  in ssu100_open()
312 		dev_dbg(&port->dev, "%s - set uart failed\n", __func__);  in ssu100_open()
315 		ssu100_set_termios(tty, port, &tty->termios);  in ssu100_open()
320 static int ssu100_attach(struct usb_serial *serial)  in ssu100_attach()  argument
322 	return ssu100_initdevice(serial->dev);  in ssu100_attach()
331 		return -ENOMEM;  in ssu100_port_probe()
333 	spin_lock_init(&priv->status_lock);  in ssu100_port_probe()
350 	struct usb_serial_port *port = tty->driver_data;  in ssu100_tiocmget()
351 	struct usb_device *dev = port->serial->dev;  in ssu100_tiocmget()
357 		return -ENOMEM;  in ssu100_tiocmget()
382 	struct usb_serial_port *port = tty->driver_data;  in ssu100_tiocmset()
383 	struct usb_device *dev = port->serial->dev;  in ssu100_tiocmset()
390 	struct usb_device *dev = port->serial->dev;  in ssu100_dtr_rts()
395 			dev_err(&port->dev, "error from flowcontrol urb\n");  in ssu100_dtr_rts()
409 	spin_lock_irqsave(&priv->status_lock, flags);  in ssu100_update_msr()
410 	priv->shadowMSR = msr;  in ssu100_update_msr()
411 	spin_unlock_irqrestore(&priv->status_lock, flags);  in ssu100_update_msr()
416 			port->icount.cts++;  in ssu100_update_msr()
418 			port->icount.dsr++;  in ssu100_update_msr()
420 			port->icount.dcd++;  in ssu100_update_msr()
422 			port->icount.rng++;  in ssu100_update_msr()
423 		wake_up_interruptible(&port->port.delta_msr_wait);  in ssu100_update_msr()
433 	spin_lock_irqsave(&priv->status_lock, flags);  in ssu100_update_lsr()
434 	priv->shadowLSR = lsr;  in ssu100_update_lsr()
435 	spin_unlock_irqrestore(&priv->status_lock, flags);  in ssu100_update_lsr()
442 			port->icount.brk++;  in ssu100_update_lsr()
447 			port->icount.parity++;  in ssu100_update_lsr()
452 			port->icount.frame++;  in ssu100_update_lsr()
457 			port->icount.overrun++;  in ssu100_update_lsr()
458 			tty_insert_flip_char(&port->port, 0, TTY_OVERRUN);  in ssu100_update_lsr()
466 	struct usb_serial_port *port = urb->context;  in ssu100_process_read_urb()
467 	char *packet = urb->transfer_buffer;  in ssu100_process_read_urb()
469 	u32 len = urb->actual_length;  in ssu100_process_read_urb()
481 		len -= 4;  in ssu100_process_read_urb()
489 	if (port->sysrq) {  in ssu100_process_read_urb()
492 				tty_insert_flip_char(&port->port, *ch, flag);  in ssu100_process_read_urb()
495 		tty_insert_flip_string_fixed_flag(&port->port, ch, flag, len);  in ssu100_process_read_urb()
498 	tty_flip_buffer_push(&port->port);  in ssu100_process_read_urb()