2 * Driver for Quatech Inc USB2.0 to serial adaptors. Largely unrelated to the
3 * serqt_usb driver, based on a re-write of the vendor supplied serqt_usb2 code,
4 * which is unrelated to the serqt_usb2 in the staging kernel
7 #include <linux/errno.h>
8 #include <linux/init.h>
9 #include <linux/slab.h>
10 #include <linux/tty.h>
11 #include <linux/tty_driver.h>
12 #include <linux/tty_flip.h>
13 #include <linux/module.h>
14 #include <linux/serial.h>
15 #include <linux/usb.h>
16 #include <linux/usb/serial.h>
17 #include <linux/uaccess.h>
21 /* Version Information */
22 #define DRIVER_VERSION "v2.00"
23 #define DRIVER_AUTHOR "Tim Gobeli, Quatech, Inc"
24 #define DRIVER_DESC "Quatech USB 2.0 to Serial Driver"
26 /* vendor and device IDs */
27 #define USB_VENDOR_ID_QUATECH 0x061d /* Quatech VID */
28 #define QUATECH_SSU2_100 0xC120 /* RS232 single port */
29 #define QUATECH_DSU2_100 0xC140 /* RS232 dual port */
30 #define QUATECH_DSU2_400 0xC150 /* RS232/422/485 dual port */
31 #define QUATECH_QSU2_100 0xC160 /* RS232 four port */
32 #define QUATECH_QSU2_400 0xC170 /* RS232/422/485 four port */
33 #define QUATECH_ESU2_100 0xC1A0 /* RS232 eight port */
34 #define QUATECH_ESU2_400 0xC180 /* RS232/422/485 eight port */
36 /* magic numbers go here, when we find out which ones are needed */
38 #define QU2BOXPWRON 0x8000 /* magic number to turn FPGA power on */
39 #define QU2BOX232 0x40 /* RS232 mode on MEI devices */
40 #define QU2BOXSPD9600 0x60 /* set speed to 9600 baud */
41 #define QT2_FIFO_DEPTH 1024 /* size of hardware fifos */
42 #define QT2_TX_HEADER_LENGTH 5
43 /* length of the header sent to the box with each write URB */
45 /* directions for USB transfers */
46 #define USBD_TRANSFER_DIRECTION_IN 0xc0
47 #define USBD_TRANSFER_DIRECTION_OUT 0x40
49 /* special Quatech command IDs. These are pushed down the
50 USB control pipe to get the box on the end to do things */
51 #define QT_SET_GET_DEVICE 0xc2
52 #define QT_OPEN_CLOSE_CHANNEL 0xca
53 /*#define QT_GET_SET_PREBUF_TRIG_LVL 0xcc
54 #define QT_SET_ATF 0xcd*/
55 #define QT2_GET_SET_REGISTER 0xc0
56 #define QT2_GET_SET_UART 0xc1
57 #define QT2_HW_FLOW_CONTROL_MASK 0xc5
58 #define QT2_SW_FLOW_CONTROL_MASK 0xc6
59 #define QT2_SW_FLOW_CONTROL_DISABLE 0xc7
60 #define QT2_BREAK_CONTROL 0xc8
61 #define QT2_STOP_RECEIVE 0xe0
62 #define QT2_FLUSH_DEVICE 0xc4
63 #define QT2_GET_SET_QMCR 0xe1
65 /* sorts of flush we can do on */
66 #define QT2_FLUSH_RX 0x00
67 #define QT2_FLUSH_TX 0x01
69 /* port setting constants, used to set up serial port speeds, flow
70 * control and so on */
71 #define QT2_SERIAL_MCR_DTR 0x01
72 #define QT2_SERIAL_MCR_RTS 0x02
73 #define QT2_SERIAL_MCR_LOOP 0x10
75 #define QT2_SERIAL_MSR_CTS 0x10
76 #define QT2_SERIAL_MSR_CD 0x80
77 #define QT2_SERIAL_MSR_RI 0x40
78 #define QT2_SERIAL_MSR_DSR 0x20
79 #define QT2_SERIAL_MSR_MASK 0xf0
81 #define QT2_SERIAL_8_DATA 0x03
82 #define QT2_SERIAL_7_DATA 0x02
83 #define QT2_SERIAL_6_DATA 0x01
84 #define QT2_SERIAL_5_DATA 0x00
86 #define QT2_SERIAL_ODD_PARITY 0x08
87 #define QT2_SERIAL_EVEN_PARITY 0x18
88 #define QT2_SERIAL_TWO_STOPB 0x04
89 #define QT2_SERIAL_ONE_STOPB 0x00
91 #define QT2_MAX_BAUD_RATE 921600
92 #define QT2_MAX_BAUD_REMAINDER 4608
94 #define QT2_SERIAL_LSR_OE 0x02
95 #define QT2_SERIAL_LSR_PE 0x04
96 #define QT2_SERIAL_LSR_FE 0x08
97 #define QT2_SERIAL_LSR_BI 0x10
99 /* value of Line Status Register when UART has completed
100 * emptying data out on the line */
101 #define QT2_LSR_TEMT 0x40
103 /* register numbers on each UART, for use with qt2_box_[get|set]_register*/
104 #define QT2_XMT_HOLD_REGISTER 0x00
105 #define QT2_XVR_BUFFER_REGISTER 0x00
106 #define QT2_FIFO_CONTROL_REGISTER 0x02
107 #define QT2_LINE_CONTROL_REGISTER 0x03
108 #define QT2_MODEM_CONTROL_REGISTER 0x04
109 #define QT2_LINE_STATUS_REGISTER 0x05
110 #define QT2_MODEM_STATUS_REGISTER 0x06
112 /* handy macros for doing escape sequence parsing on data reads */
113 #define THISCHAR ((unsigned char *)(urb->transfer_buffer))[i]
114 #define NEXTCHAR ((unsigned char *)(urb->transfer_buffer))[i + 1]
115 #define THIRDCHAR ((unsigned char *)(urb->transfer_buffer))[i + 2]
116 #define FOURTHCHAR ((unsigned char *)(urb->transfer_buffer))[i + 3]
117 #define FIFTHCHAR ((unsigned char *)(urb->transfer_buffer))[i + 4]
119 static const struct usb_device_id quausb2_id_table[] = {
120 {USB_DEVICE(USB_VENDOR_ID_QUATECH, QUATECH_SSU2_100)},
121 {USB_DEVICE(USB_VENDOR_ID_QUATECH, QUATECH_DSU2_100)},
122 {USB_DEVICE(USB_VENDOR_ID_QUATECH, QUATECH_DSU2_400)},
123 {USB_DEVICE(USB_VENDOR_ID_QUATECH, QUATECH_QSU2_100)},
124 {USB_DEVICE(USB_VENDOR_ID_QUATECH, QUATECH_QSU2_400)},
125 {USB_DEVICE(USB_VENDOR_ID_QUATECH, QUATECH_ESU2_100)},
126 {USB_DEVICE(USB_VENDOR_ID_QUATECH, QUATECH_ESU2_400)},
127 {} /* Terminating entry */
130 MODULE_DEVICE_TABLE(usb, quausb2_id_table);
132 /* custom structures we need go here */
133 static struct usb_driver quausb2_usb_driver = {
134 .name = "quatech-usb2-serial",
135 .disconnect = usb_serial_disconnect,
136 .id_table = quausb2_id_table,
140 * quatech2_port: Structure in which to keep all the messy stuff that this
141 * driver needs alongside the usb_serial_port structure
142 * @read_urb_busy: Flag indicating that port->read_urb is in use
143 * @close_pending: flag indicating that this port is in the process of
144 * being closed (and so no new reads / writes should be started).
145 * @shadowLSR: Last received state of the line status register, holds the
146 * value of the line status flags from the port
147 * @shadowMSR: Last received state of the modem status register, holds
148 * the value of the modem status received from the port
149 * @rcv_flush: Flag indicating that a receive flush has occurred on
151 * @xmit_flush: Flag indicating that a transmit flush has been processed by
153 * @tx_pending_bytes: Number of bytes waiting to be sent. This total
154 * includes the size (excluding header) of URBs that have been submitted but
155 * have not yet been sent to to the device, and bytes that have been sent out
156 * of the port but not yet reported sent by the "xmit_empty" messages (which
157 * indicate the number of bytes sent each time they are received, despite the
159 * - Starts at zero when port is initialised.
160 * - is incremented by the size of the data to be written (no headers)
161 * each time a write urb is dispatched.
162 * - is decremented each time a "transmit empty" message is received
163 * by the driver in the data stream.
164 * @lock: Mutex to lock access to this structure when we need to ensure that
165 * races don't occur to access bits of it.
166 * @open_count: The number of uses of the port currently having
167 * it open, i.e. the reference count.
169 struct quatech2_port {
177 int tx_pending_bytes;
178 struct mutex modelock;
181 char active; /* someone has this device open */
182 unsigned char *xfer_to_tty_buffer;
183 wait_queue_head_t wait;
184 __u8 shadowLCR; /* last LCR value received */
185 __u8 shadowMCR; /* last MCR value received */
187 struct semaphore pend_xmit_sem; /* locks this structure */
192 * Structure to hold device-wide internal status information
193 * @param ReadBulkStopped The last bulk read attempt ended in tears
194 * @param open_ports The number of serial ports currently in use on the box
195 * @param current_port Pointer to the serial port structure of the port which
196 * the read stream is currently directed to. Escape sequences in the read
197 * stream will change this around as data arrives from different ports on the
199 * @buffer_size: The max size buffer each URB can take, used to set the size of
200 * the buffers allocated for writing to each port on the device (we need to
201 * store this because it is known only to the endpoint, but used each time a
202 * port is opened and a new buffer is allocated.
204 struct quatech2_dev {
205 bool ReadBulkStopped;
207 struct usb_serial_port *current_port;
211 /* structure which holds line and modem status flags */
212 struct qt2_status_data {
217 /* Function prototypes */
218 static int qt2_boxpoweron(struct usb_serial *serial);
219 static int qt2_boxsetQMCR(struct usb_serial *serial, __u16 Uart_Number,
221 static int port_paranoia_check(struct usb_serial_port *port,
222 const char *function);
223 static int serial_paranoia_check(struct usb_serial *serial,
224 const char *function);
225 static inline struct quatech2_port *qt2_get_port_private(struct usb_serial_port
227 static inline void qt2_set_port_private(struct usb_serial_port *port,
228 struct quatech2_port *data);
229 static inline struct quatech2_dev *qt2_get_dev_private(struct usb_serial
231 static inline void qt2_set_dev_private(struct usb_serial *serial,
232 struct quatech2_dev *data);
233 static int qt2_openboxchannel(struct usb_serial *serial, __u16
234 Uart_Number, struct qt2_status_data *pDeviceData);
235 static int qt2_closeboxchannel(struct usb_serial *serial, __u16
237 static int qt2_conf_uart(struct usb_serial *serial, unsigned short Uart_Number,
238 unsigned short divisor, unsigned char LCR);
239 static void qt2_read_bulk_callback(struct urb *urb);
240 static void qt2_write_bulk_callback(struct urb *urb);
241 static void qt2_process_line_status(struct usb_serial_port *port,
242 unsigned char LineStatus);
243 static void qt2_process_modem_status(struct usb_serial_port *port,
244 unsigned char ModemStatus);
245 static void qt2_process_xmit_empty(struct usb_serial_port *port,
246 unsigned char fourth_char, unsigned char fifth_char);
247 static void qt2_process_port_change(struct usb_serial_port *port,
248 unsigned char New_Current_Port);
249 static void qt2_process_rcv_flush(struct usb_serial_port *port);
250 static void qt2_process_xmit_flush(struct usb_serial_port *port);
251 static void qt2_process_rx_char(struct usb_serial_port *port,
253 static int qt2_box_get_register(struct usb_serial *serial,
254 unsigned char uart_number, unsigned short register_num,
256 static int qt2_box_set_register(struct usb_serial *serial,
257 unsigned short Uart_Number, unsigned short Register_Num,
258 unsigned short Value);
259 static int qt2_boxsetuart(struct usb_serial *serial, unsigned short Uart_Number,
260 unsigned short default_divisor, unsigned char default_LCR);
261 static int qt2_boxsethw_flowctl(struct usb_serial *serial,
262 unsigned int UartNumber, bool bSet);
263 static int qt2_boxsetsw_flowctl(struct usb_serial *serial, __u16 UartNumber,
264 unsigned char stop_char, unsigned char start_char);
265 static int qt2_boxunsetsw_flowctl(struct usb_serial *serial, __u16 UartNumber);
266 static int qt2_boxstoprx(struct usb_serial *serial, unsigned short uart_number,
267 unsigned short stop);
269 /* implementation functions, roughly in order of use, are here */
270 static int qt2_calc_num_ports(struct usb_serial *serial)
274 switch (serial->dev->descriptor.idProduct) {
275 case QUATECH_SSU2_100:
279 case QUATECH_DSU2_400:
281 case QUATECH_DSU2_100:
285 case QUATECH_QSU2_400:
287 case QUATECH_QSU2_100:
291 case QUATECH_ESU2_400:
293 case QUATECH_ESU2_100:
303 static int qt2_attach(struct usb_serial *serial)
305 struct usb_serial_port *port;
306 struct quatech2_port *qt2_port; /* port-specific private data pointer */
307 struct quatech2_dev *qt2_dev; /* dev-specific private data pointer */
309 /* stuff for storing endpoint addresses now */
310 struct usb_endpoint_descriptor *endpoint;
311 struct usb_host_interface *iface_desc;
312 struct usb_serial_port *port0; /* first port structure on device */
314 /* check how many endpoints there are on the device, for
316 dbg("%s(): Endpoints: %d bulk in, %d bulk out, %d interrupt in",
317 __func__, serial->num_bulk_in,
318 serial->num_bulk_out, serial->num_interrupt_in);
319 if ((serial->num_bulk_in != 1) || (serial->num_bulk_out != 1)) {
320 dbg("Device has wrong number of bulk endpoints!");
323 iface_desc = serial->interface->cur_altsetting;
325 /* Set up per-device private data, storing extra data alongside
326 * struct usb_serial */
327 qt2_dev = kzalloc(sizeof(*qt2_dev), GFP_KERNEL);
329 dbg("%s: kmalloc for quatech2_dev failed!",
333 qt2_dev->open_ports = 0; /* no ports open */
334 qt2_set_dev_private(serial, qt2_dev); /* store private data */
336 /* Now setup per port private data, which replaces all the things
337 * that quatech added to standard kernel structures in their driver */
338 for (i = 0; i < serial->num_ports; i++) {
339 port = serial->port[i];
340 qt2_port = kzalloc(sizeof(*qt2_port), GFP_KERNEL);
342 dbg("%s: kmalloc for quatech2_port (%d) failed!.",
346 /* initialise stuff in the structure */
347 qt2_port->open_count = 0; /* port is not open */
348 spin_lock_init(&qt2_port->lock);
349 mutex_init(&qt2_port->modelock);
350 qt2_set_port_private(port, qt2_port);
353 /* gain access to port[0]'s structure because we want to store
354 * device-level stuff in it */
355 if (serial_paranoia_check(serial, __func__))
357 port0 = serial->port[0]; /* get the first port's device structure */
359 /* print endpoint addresses so we can check them later
361 for (i = 0; i < iface_desc->desc.bNumEndpoints; ++i) {
362 endpoint = &iface_desc->endpoint[i].desc;
363 if ((endpoint->bEndpointAddress & 0x80) &&
364 ((endpoint->bmAttributes & 3) == 0x02)) {
365 /* we found a bulk in endpoint */
366 dbg("found bulk in at %#.2x",
367 endpoint->bEndpointAddress);
370 if (((endpoint->bEndpointAddress & 0x80) == 0x00) &&
371 ((endpoint->bmAttributes & 3) == 0x02)) {
372 /* we found a bulk out endpoint */
373 dbg("found bulk out at %#.2x",
374 endpoint->bEndpointAddress);
375 qt2_dev->buffer_size = endpoint->wMaxPacketSize;
376 /* max size of URB needs recording for the device */
378 } /* end printing endpoint addresses */
380 /* switch on power to the hardware */
381 if (qt2_boxpoweron(serial) < 0) {
382 dbg("qt2_boxpoweron() failed");
385 /* set all ports to RS232 mode */
386 for (i = 0; i < serial->num_ports; ++i) {
387 if (qt2_boxsetQMCR(serial, i, QU2BOX232) < 0) {
388 dbg("qt2_boxsetQMCR() on port %d failed",
397 for (i = 0; i < serial->num_ports; i++) {
398 port = serial->port[i];
399 qt2_port = qt2_get_port_private(port);
401 qt2_set_port_private(port, NULL);
403 qt2_dev = qt2_get_dev_private(serial);
405 qt2_set_dev_private(serial, NULL);
407 dbg("Exit fail %s\n", __func__);
411 static void qt2_release(struct usb_serial *serial)
413 struct usb_serial_port *port;
414 struct quatech2_port *qt_port;
417 for (i = 0; i < serial->num_ports; i++) {
418 port = serial->port[i];
422 qt_port = usb_get_serial_port_data(port);
424 usb_set_serial_port_data(port, NULL);
427 /* This function is called once per serial port on the device, when
428 * that port is opened by a userspace application.
429 * The tty_struct and the usb_serial_port belong to this port,
430 * i.e. there are multiple ones for a multi-port device.
431 * However the usb_serial_port structure has a back-pointer
432 * to the parent usb_serial structure which belongs to the device,
433 * so we can access either the device-wide information or
434 * any other port's information (because there are also forward
435 * pointers) via that pointer.
436 * This is most helpful if the device shares resources (e.g. end
437 * points) between different ports
439 int qt2_open(struct tty_struct *tty, struct usb_serial_port *port)
441 struct usb_serial *serial; /* device structure */
442 struct usb_serial_port *port0; /* first port structure on device */
443 struct quatech2_port *port_extra; /* extra data for this port */
444 struct quatech2_port *port0_extra; /* extra data for first port */
445 struct quatech2_dev *dev_extra; /* extra data for the device */
446 struct qt2_status_data ChannelData;
447 unsigned short default_divisor = QU2BOXSPD9600;
448 unsigned char default_LCR = QT2_SERIAL_8_DATA;
452 if (port_paranoia_check(port, __func__))
455 serial = port->serial; /* get the parent device structure */
456 if (serial_paranoia_check(serial, __func__)) {
457 dbg("usb_serial struct failed sanity check");
460 dev_extra = qt2_get_dev_private(serial);
461 /* get the device private data */
462 if (dev_extra == NULL) {
463 dbg("device extra data pointer is null");
466 port0 = serial->port[0]; /* get the first port's device structure */
467 if (port_paranoia_check(port0, __func__)) {
468 dbg("port0 usb_serial_port struct failed sanity check");
472 port_extra = qt2_get_port_private(port);
473 port0_extra = qt2_get_port_private(port0);
474 if (port_extra == NULL || port0_extra == NULL) {
475 dbg("failed to get private data for port or port0");
479 /* FIXME: are these needed? Does it even do anything useful? */
480 /* get the modem and line status values from the UART */
481 status = qt2_openboxchannel(serial, port->number,
484 dbg("qt2_openboxchannel on channel %d failed",
488 port_extra->shadowLSR = ChannelData.line_status &
489 (QT2_SERIAL_LSR_OE | QT2_SERIAL_LSR_PE |
490 QT2_SERIAL_LSR_FE | QT2_SERIAL_LSR_BI);
491 port_extra->shadowMSR = ChannelData.modem_status &
492 (QT2_SERIAL_MSR_CTS | QT2_SERIAL_MSR_DSR |
493 QT2_SERIAL_MSR_RI | QT2_SERIAL_MSR_CD);
495 /* port_extra->fifo_empty_flag = true;*/
496 dbg("qt2_openboxchannel on channel %d completed.",
499 /* Set Baud rate to default and turn off flow control here */
500 status = qt2_conf_uart(serial, port->number, default_divisor,
503 dbg("qt2_conf_uart() failed on channel %d",
507 dbg("qt2_conf_uart() completed on channel %d",
511 * At this point we will need some end points to make further progress.
512 * Handlily, the correct endpoint addresses have been filled out into
513 * the usb_serial_port structure for us by the driver core, so we
514 * already have access to them.
515 * As there is only one bulk in and one bulk out end-point, these are in
516 * port[0]'s structure, and the rest are uninitialised. Handily,
517 * when we do a write to a port, we will use the same endpoint
518 * regardless of the port, with a 5-byte header added on to
519 * tell the box which port it should eventually come out of, so we only
520 * need the one set of endpoints. We will have one URB per port for
521 * writing, so that multiple ports can be writing at once.
522 * Finally we need a bulk in URB to use for background reads from the
523 * device, which will deal with uplink data from the box to host.
525 dbg("port0 bulk in endpoint is %#.2x", port0->bulk_in_endpointAddress);
526 dbg("port0 bulk out endpoint is %#.2x",
527 port0->bulk_out_endpointAddress);
529 /* set up write_urb for bulk out transfers on this port. The USB
530 * serial framework will have allocated a blank URB, buffer etc for
531 * port0 when it put the endpoints there, but not for any of the other
532 * ports on the device because there are no more endpoints. Thus we
533 * have to allocate our own URBs for ports 1-7
535 if (port->write_urb == NULL) {
536 dbg("port->write_urb == NULL, allocating one");
537 port->write_urb = usb_alloc_urb(0, GFP_KERNEL);
538 if (!port->write_urb) {
539 dev_err(&port->dev, "Allocating write URB failed\n");
542 /* buffer same size as port0 */
543 port->bulk_out_size = dev_extra->buffer_size;
544 port->bulk_out_buffer = kmalloc(port->bulk_out_size,
546 if (!port->bulk_out_buffer) {
547 dev_err(&port->dev, "Couldn't allocate bulk_out_buffer\n");
551 if (serial->dev == NULL)
552 dbg("serial->dev == NULL");
553 dbg("port->bulk_out_size is %d", port->bulk_out_size);
555 usb_fill_bulk_urb(port->write_urb, serial->dev,
556 usb_sndbulkpipe(serial->dev,
557 port0->bulk_out_endpointAddress),
558 port->bulk_out_buffer,
560 qt2_write_bulk_callback,
562 port_extra->tx_pending_bytes = 0;
564 if (dev_extra->open_ports == 0) {
565 /* this is first port to be opened, so need the read URB
566 * initialised for bulk in transfers (this is shared amongst
567 * all the ports on the device) */
568 usb_fill_bulk_urb(port0->read_urb, serial->dev,
569 usb_rcvbulkpipe(serial->dev,
570 port0->bulk_in_endpointAddress),
571 port0->bulk_in_buffer,
573 qt2_read_bulk_callback, serial);
574 dbg("port0 bulk in URB initialised");
576 /* submit URB, i.e. start reading from device (async) */
577 dev_extra->ReadBulkStopped = false;
578 port_extra->read_urb_busy = true;
579 result = usb_submit_urb(port->read_urb, GFP_KERNEL);
582 "%s(): Error %d submitting bulk in urb",
584 port_extra->read_urb_busy = false;
585 dev_extra->ReadBulkStopped = true;
588 /* When the first port is opened, initialise the value of
589 * current_port in dev_extra to this port, so it is set
590 * to something. Once the box sends data it will send the
591 * relevant escape sequences to get it to the right port anyway
593 dev_extra->current_port = port;
596 /* initialize our wait queues */
597 init_waitqueue_head(&port_extra->wait);
598 /* increment the count of openings of this port by one */
599 port_extra->open_count++;
601 /* remember to store dev_extra, port_extra and port0_extra back again at
603 qt2_set_port_private(port, port_extra);
604 qt2_set_port_private(serial->port[0], port0_extra);
605 qt2_set_dev_private(serial, dev_extra);
607 dev_extra->open_ports++; /* one more port opened */
612 /* called when a port is closed by userspace. It won't be called, however,
613 * until calls to chars_in_buffer() reveal that the port has completed
614 * sending buffered data, and there is nothing else to do. Thus we don't have
615 * to rely on forcing data through in this function. */
616 /* Setting close_pending should keep new data from being written out,
617 * once all the data in the enpoint buffers is moved out we won't get
619 /* BoxStopReceive would keep any more data from coming from a given
620 * port, but isn't called by the vendor driver, although their comments
621 * mention it. Should it be used here to stop the inbound data
624 static void qt2_close(struct usb_serial_port *port)
626 /* time out value for flush loops */
628 struct quatech2_port *port_extra; /* extra data for this port */
629 struct usb_serial *serial; /* device structure */
630 struct quatech2_dev *dev_extra; /* extra data for the device */
631 __u8 lsr_value = 0; /* value of Line Status Register */
632 int status; /* result of last USB comms function */
634 serial = port->serial; /* get the parent device structure */
635 dev_extra = qt2_get_dev_private(serial);
636 /* get the device private data */
637 port_extra = qt2_get_port_private(port); /* port private data */
639 /* we can now (and only now) stop reading data */
640 port_extra->close_pending = true;
641 dbg("%s(): port_extra->close_pending = true", __func__);
642 /* although the USB side is now empty, the UART itself may
643 * still be pushing characters out over the line, so we have to
644 * wait testing the actual line status until the lines change
645 * indicating that the data is done transferring. */
646 /* FIXME: slow this polling down so it doesn't run the USB bus flat out
647 * if it actually has to spend any time in this loop (which it normally
648 * doesn't because the buffer is nearly empty) */
649 jift = jiffies + (10 * HZ); /* 10 sec timeout */
651 status = qt2_box_get_register(serial, port->number,
652 QT2_LINE_STATUS_REGISTER, &lsr_value);
654 dbg("%s(): qt2_box_get_register failed", __func__);
657 if ((lsr_value & QT2_LSR_TEMT)) {
658 dbg("UART done sending");
662 } while (jiffies <= jift);
664 status = qt2_closeboxchannel(serial, port->number);
666 dbg("%s(): port %d qt2_box_open_close_channel failed",
667 __func__, port->number);
668 /* to avoid leaking URBs, we should now free the write_urb for this
669 * port and set the pointer to null so that next time the port is opened
670 * a new URB is allocated. This avoids leaking URBs when the device is
672 usb_free_urb(port->write_urb);
673 kfree(port->bulk_out_buffer);
674 port->bulk_out_buffer = NULL;
675 port->bulk_out_size = 0;
677 /* decrement the count of openings of this port by one */
678 port_extra->open_count--;
679 /* one less overall open as well */
680 dev_extra->open_ports--;
681 dbg("%s(): Exit, dev_extra->open_ports = %d", __func__,
682 dev_extra->open_ports);
686 * qt2_write - write bytes from the tty layer out to the USB device.
687 * @buf: The data to be written, size at least count.
688 * @count: The number of bytes requested for transmission.
689 * @return The number of bytes actually accepted for transmission to the device.
691 static int qt2_write(struct tty_struct *tty, struct usb_serial_port *port,
692 const unsigned char *buf, int count)
694 struct usb_serial *serial; /* parent device struct */
695 __u8 header_array[5]; /* header used to direct writes to the correct
696 port on the device */
697 struct quatech2_port *port_extra; /* extra data for this port */
700 serial = port->serial; /* get the parent device of the port */
701 port_extra = qt2_get_port_private(port); /* port extra info */
704 dbg("%s(): port %d, requested to write %d bytes, %d already pending",
705 __func__, port->number, count, port_extra->tx_pending_bytes);
708 dbg("%s(): write request of <= 0 bytes", __func__);
709 return 0; /* no bytes written */
712 /* check if the write urb is already in use, i.e. data already being
713 * sent to this port */
714 if ((port->write_urb->status == -EINPROGRESS)) {
715 /* Fifo hasn't been emptied since last write to this port */
716 dbg("%s(): already writing, port->write_urb->status == "
717 "-EINPROGRESS", __func__);
718 /* schedule_work(&port->work); commented in vendor driver */
720 } else if (port_extra->tx_pending_bytes >= QT2_FIFO_DEPTH) {
721 /* buffer is full (==). > should not occur, but would indicate
722 * that an overflow had occurred */
723 dbg("%s(): port transmit buffer is full!", __func__);
724 /* schedule_work(&port->work); commented in vendor driver */
728 /* We must fill the first 5 bytes of anything we sent with a transmit
729 * header which directes the data to the correct port. The maximum
730 * size we can send out in one URB is port->bulk_out_size, which caps
731 * the number of bytes of real data we can send in each write. As the
732 * semantics of write allow us to write less than we were give, we cap
733 * the maximum we will ever write to the device as 5 bytes less than
734 * one URB's worth, by reducing the value of the count argument
736 if (count > port->bulk_out_size - QT2_TX_HEADER_LENGTH) {
737 count = port->bulk_out_size - QT2_TX_HEADER_LENGTH;
738 dbg("%s(): write request bigger than urb, only accepting "
739 "%d bytes", __func__, count);
741 /* we must also ensure that the FIFO at the other end can cope with the
742 * URB we send it, otherwise it will have problems. As above, we can
743 * restrict the write size by just shrinking count.*/
744 if (count > (QT2_FIFO_DEPTH - port_extra->tx_pending_bytes)) {
745 count = QT2_FIFO_DEPTH - port_extra->tx_pending_bytes;
746 dbg("%s(): not enough room in buffer, only accepting %d bytes",
749 /* now build the header for transmission */
750 header_array[0] = 0x1b;
751 header_array[1] = 0x1b;
752 header_array[2] = (__u8)port->number;
753 header_array[3] = (__u8)count;
754 header_array[4] = (__u8)count >> 8;
755 /* copy header into URB */
756 memcpy(port->write_urb->transfer_buffer, header_array,
757 QT2_TX_HEADER_LENGTH);
758 /* and actual data to write */
759 memcpy(port->write_urb->transfer_buffer + 5, buf, count);
761 dbg("%s(): first data byte to send = %#.2x", __func__, *buf);
764 usb_fill_bulk_urb(port->write_urb, serial->dev,
765 usb_sndbulkpipe(serial->dev,
766 port->bulk_out_endpointAddress),
767 port->write_urb->transfer_buffer, count + 5,
768 (qt2_write_bulk_callback), port);
769 /* send the data out the bulk port */
770 result = usb_submit_urb(port->write_urb, GFP_ATOMIC);
772 /* error couldn't submit urb */
773 result = 0; /* return 0 as nothing got written */
774 dbg("%s(): failed submitting write urb, error %d",
777 port_extra->tx_pending_bytes += count;
778 result = count; /* return number of bytes written, i.e. count */
779 dbg("%s(): submitted write urb, wrote %d bytes, "
780 "total pending bytes %d",
781 __func__, result, port_extra->tx_pending_bytes);
786 /* This is used by the next layer up to know how much space is available
787 * in the buffer on the device. It is used on a device closure to avoid
788 * calling close() until the buffer is reported to be empty.
789 * The returned value must never go down by more than the number of bytes
790 * written for correct behaviour further up the driver stack, i.e. if I call
791 * it, then write 6 bytes, then call again I should get 6 less, or possibly
792 * only 5 less if one was written in the meantime, etc. I should never get 7
793 * less (or any bigger number) because I only wrote 6 bytes.
795 static int qt2_write_room(struct tty_struct *tty)
797 struct usb_serial_port *port = tty->driver_data;
798 /* parent usb_serial_port pointer */
799 struct quatech2_port *port_extra; /* extra data for this port */
801 port_extra = qt2_get_port_private(port);
803 if (port_extra->close_pending == true) {
804 dbg("%s(): port_extra->close_pending == true", __func__);
807 /* Q: how many bytes would a write() call actually succeed in writing
808 * if it happened now?
809 * A: one QT2_FIFO_DEPTH, less the number of bytes waiting to be sent
810 * out of the port, unless this is more than the size of the
811 * write_urb output buffer less the header, which is the maximum
812 * size write we can do.
814 * Most of the implementation of this is done when writes to the device
815 * are started or terminate. When we send a write to the device, we
816 * reduce the free space count by the size of the dispatched write.
817 * When a "transmit empty" message comes back up the USB read stream,
818 * we decrement the count by the number of bytes reported sent, thus
819 * keeping track of the difference between sent and received bytes.
822 room = (QT2_FIFO_DEPTH - port_extra->tx_pending_bytes);
824 if (room > port->bulk_out_size - QT2_TX_HEADER_LENGTH)
825 room = port->bulk_out_size - QT2_TX_HEADER_LENGTH;
826 /* if more than the URB can hold, then cap to that limit */
828 dbg("%s(): port %d: write room is %d", __func__, port->number, room);
832 static int qt2_chars_in_buffer(struct tty_struct *tty)
834 struct usb_serial_port *port = tty->driver_data;
835 /* parent usb_serial_port pointer */
836 struct quatech2_port *port_extra; /* extra data for this port */
837 port_extra = qt2_get_port_private(port);
839 dbg("%s(): port %d: chars_in_buffer = %d", __func__,
840 port->number, port_extra->tx_pending_bytes);
841 return port_extra->tx_pending_bytes;
844 /* called when userspace does an ioctl() on the device. Note that
845 * TIOCMGET and TIOCMSET are filtered off to their own methods before they get
846 * here, so we don't have to handle them.
848 static int qt2_ioctl(struct tty_struct *tty,
849 unsigned int cmd, unsigned long arg)
851 struct usb_serial_port *port = tty->driver_data;
852 struct usb_serial *serial = port->serial;
853 __u8 mcr_value; /* Modem Control Register value */
854 __u8 msr_value; /* Modem Status Register value */
855 unsigned short prev_msr_value; /* Previous value of Modem Status
856 * Register used to implement waiting for a line status change to
858 struct quatech2_port *port_extra; /* extra data for this port */
859 DECLARE_WAITQUEUE(wait, current);
860 /* Declare a wait queue named "wait" */
863 unsigned int UartNumber;
867 UartNumber = tty->index - serial->minor;
868 port_extra = qt2_get_port_private(port);
870 dbg("%s(): port %d, UartNumber %d, tty =0x%p", __func__,
871 port->number, UartNumber, tty);
873 if (cmd == TIOCMBIS || cmd == TIOCMBIC) {
874 if (qt2_box_get_register(port->serial, UartNumber,
875 QT2_MODEM_CONTROL_REGISTER, &mcr_value) < 0)
877 if (copy_from_user(&value, (unsigned int *)arg,
883 if (value & TIOCM_RTS)
884 mcr_value |= QT2_SERIAL_MCR_RTS;
885 if (value & TIOCM_DTR)
886 mcr_value |= QT2_SERIAL_MCR_DTR;
887 if (value & TIOCM_LOOP)
888 mcr_value |= QT2_SERIAL_MCR_LOOP;
891 if (value & TIOCM_RTS)
892 mcr_value &= ~QT2_SERIAL_MCR_RTS;
893 if (value & TIOCM_DTR)
894 mcr_value &= ~QT2_SERIAL_MCR_DTR;
895 if (value & TIOCM_LOOP)
896 mcr_value &= ~QT2_SERIAL_MCR_LOOP;
900 } /* end of local switch on cmd */
901 if (qt2_box_set_register(port->serial, UartNumber,
902 QT2_MODEM_CONTROL_REGISTER, mcr_value) < 0) {
905 port_extra->shadowMCR = mcr_value;
908 } else if (cmd == TIOCMIWAIT) {
909 dbg("%s() port %d, cmd == TIOCMIWAIT enter",
910 __func__, port->number);
911 prev_msr_value = port_extra->shadowMSR & QT2_SERIAL_MSR_MASK;
913 __set_current_state(TASK_INTERRUPTIBLE);
915 add_wait_queue(&port_extra->wait, &wait);
917 dbg("%s(): port %d, cmd == TIOCMIWAIT here\n",
918 __func__, port->number);
919 remove_wait_queue(&port_extra->wait, &wait);
920 /* see if a signal woke us up */
921 if (signal_pending(current))
923 set_current_state(TASK_INTERRUPTIBLE);
924 msr_value = port_extra->shadowMSR & QT2_SERIAL_MSR_MASK;
925 if (msr_value == prev_msr_value) {
926 __set_current_state(TASK_RUNNING);
927 return -EIO; /* no change - error */
929 if ((arg & TIOCM_RNG &&
930 ((prev_msr_value & QT2_SERIAL_MSR_RI) ==
931 (msr_value & QT2_SERIAL_MSR_RI))) ||
933 ((prev_msr_value & QT2_SERIAL_MSR_DSR) ==
934 (msr_value & QT2_SERIAL_MSR_DSR))) ||
936 ((prev_msr_value & QT2_SERIAL_MSR_CD) ==
937 (msr_value & QT2_SERIAL_MSR_CD))) ||
939 ((prev_msr_value & QT2_SERIAL_MSR_CTS) ==
940 (msr_value & QT2_SERIAL_MSR_CTS)))) {
941 __set_current_state(TASK_RUNNING);
944 } /* end inifinite while */
945 /* FIXME: This while loop needs a way to break out if the device
946 * is disconnected while a process is waiting for the MSR to
947 * change, because once it's disconnected, it isn't going to
948 * change state ... */
950 /* any other ioctls we don't know about come here */
951 dbg("%s(): No ioctl for that one. port = %d", __func__,
957 /* Called when the user wishes to change the port settings using the termios
958 * userspace interface */
959 static void qt2_set_termios(struct tty_struct *tty,
960 struct usb_serial_port *port, struct ktermios *old_termios)
962 struct usb_serial *serial; /* parent serial device */
963 int baud, divisor, remainder;
964 unsigned char LCR_change_to = 0;
968 serial = port->serial;
969 UartNumber = port->number;
971 if (old_termios && !tty_termios_hw_change(old_termios, tty->termios))
974 switch (tty->termios->c_cflag) {
976 LCR_change_to |= QT2_SERIAL_5_DATA;
979 LCR_change_to |= QT2_SERIAL_6_DATA;
982 LCR_change_to |= QT2_SERIAL_7_DATA;
986 LCR_change_to |= QT2_SERIAL_8_DATA;
991 if (tty->termios->c_cflag & PARENB) {
992 if (tty->termios->c_cflag & PARODD)
993 LCR_change_to |= QT2_SERIAL_ODD_PARITY;
995 LCR_change_to |= QT2_SERIAL_EVEN_PARITY;
997 /* Because LCR_change_to is initialised to zero, we don't have to worry
998 * about the case where PARENB is not set or clearing bits, because by
999 * default all of them are cleared, turning parity off.
1000 * as we don't support mark/space parity, we should clear the
1001 * mark/space parity bit in c_cflag, so the caller can tell we have
1002 * ignored the request */
1003 tty->termios->c_cflag &= ~CMSPAR;
1005 if (tty->termios->c_cflag & CSTOPB)
1006 LCR_change_to |= QT2_SERIAL_TWO_STOPB;
1008 LCR_change_to |= QT2_SERIAL_ONE_STOPB;
1010 /* Thats the LCR stuff, next we need to work out the divisor as the
1011 * LCR and the divisor are set together */
1012 baud = tty_get_baud_rate(tty);
1014 /* pick a default, any default... */
1017 dbg("%s(): got baud = %d", __func__, baud);
1019 divisor = QT2_MAX_BAUD_RATE / baud;
1020 remainder = QT2_MAX_BAUD_RATE % baud;
1021 /* Round to nearest divisor */
1022 if (((remainder * 2) >= baud) && (baud != 110))
1024 dbg("%s(): setting divisor = %d, QT2_MAX_BAUD_RATE = %d , LCR = %#.2x",
1025 __func__, divisor, QT2_MAX_BAUD_RATE, LCR_change_to);
1027 status = qt2_boxsetuart(serial, UartNumber, (unsigned short) divisor,
1030 dbg("qt2_boxsetuart() failed");
1033 /* now encode the baud rate we actually set, which may be
1034 * different to the request */
1035 baud = QT2_MAX_BAUD_RATE / divisor;
1036 tty_encode_baud_rate(tty, baud, baud);
1039 /* Now determine flow control */
1040 if (tty->termios->c_cflag & CRTSCTS) {
1041 dbg("%s(): Enabling HW flow control port %d", __func__,
1043 /* Enable RTS/CTS flow control */
1044 status = qt2_boxsethw_flowctl(serial, UartNumber, true);
1046 dbg("qt2_boxsethw_flowctl() failed");
1050 /* Disable RTS/CTS flow control */
1051 dbg("%s(): disabling HW flow control port %d", __func__,
1053 status = qt2_boxsethw_flowctl(serial, UartNumber, false);
1055 dbg("qt2_boxsethw_flowctl failed");
1059 /* if we are implementing XON/XOFF, set the start and stop character
1061 if (I_IXOFF(tty) || I_IXON(tty)) {
1062 unsigned char stop_char = STOP_CHAR(tty);
1063 unsigned char start_char = START_CHAR(tty);
1064 status = qt2_boxsetsw_flowctl(serial, UartNumber, stop_char,
1067 dbg("qt2_boxsetsw_flowctl (enabled) failed");
1069 /* disable SW flow control */
1070 status = qt2_boxunsetsw_flowctl(serial, UartNumber);
1072 dbg("qt2_boxunsetsw_flowctl (disabling) failed");
1076 static int qt2_tiocmget(struct tty_struct *tty)
1078 struct usb_serial_port *port = tty->driver_data;
1079 struct usb_serial *serial = port->serial;
1081 __u8 mcr_value; /* Modem Control Register value */
1082 __u8 msr_value; /* Modem Status Register value */
1083 unsigned int result = 0;
1085 unsigned int UartNumber;
1090 UartNumber = tty->index - serial->minor;
1092 status = qt2_box_get_register(port->serial, UartNumber,
1093 QT2_MODEM_CONTROL_REGISTER, &mcr_value);
1095 status = qt2_box_get_register(port->serial, UartNumber,
1096 QT2_MODEM_STATUS_REGISTER, &msr_value);
1099 result = ((mcr_value & QT2_SERIAL_MCR_DTR) ? TIOCM_DTR : 0)
1101 | ((mcr_value & QT2_SERIAL_MCR_RTS) ? TIOCM_RTS : 0)
1103 | ((msr_value & QT2_SERIAL_MSR_CTS) ? TIOCM_CTS : 0)
1105 | ((msr_value & QT2_SERIAL_MSR_CD) ? TIOCM_CAR : 0)
1106 /*Carrier detect set */
1107 | ((msr_value & QT2_SERIAL_MSR_RI) ? TIOCM_RI : 0)
1108 /* Ring indicator set */
1109 | ((msr_value & QT2_SERIAL_MSR_DSR) ? TIOCM_DSR : 0);
1117 static int qt2_tiocmset(struct tty_struct *tty,
1118 unsigned int set, unsigned int clear)
1120 struct usb_serial_port *port = tty->driver_data;
1121 struct usb_serial *serial = port->serial;
1122 __u8 mcr_value; /* Modem Control Register value */
1124 unsigned int UartNumber;
1129 UartNumber = tty->index - serial->minor;
1131 status = qt2_box_get_register(port->serial, UartNumber,
1132 QT2_MODEM_CONTROL_REGISTER, &mcr_value);
1136 /* Turn off RTS, DTR and loopback, then only turn on what was asked
1138 mcr_value &= ~(QT2_SERIAL_MCR_RTS | QT2_SERIAL_MCR_DTR |
1139 QT2_SERIAL_MCR_LOOP);
1140 if (set & TIOCM_RTS)
1141 mcr_value |= QT2_SERIAL_MCR_RTS;
1142 if (set & TIOCM_DTR)
1143 mcr_value |= QT2_SERIAL_MCR_DTR;
1144 if (set & TIOCM_LOOP)
1145 mcr_value |= QT2_SERIAL_MCR_LOOP;
1147 status = qt2_box_set_register(port->serial, UartNumber,
1148 QT2_MODEM_CONTROL_REGISTER, mcr_value);
1155 /** qt2_break - Turn BREAK on and off on the UARTs
1157 static void qt2_break(struct tty_struct *tty, int break_state)
1159 struct usb_serial_port *port = tty->driver_data; /* parent port */
1160 struct usb_serial *serial = port->serial; /* parent device */
1161 struct quatech2_port *port_extra; /* extra data for this port */
1163 unsigned int result;
1165 port_extra = qt2_get_port_private(port);
1167 dbg("%s(): port %d: no serial object", __func__, port->number);
1171 if (break_state == -1)
1175 dbg("%s(): port %d, break_value %d", __func__, port->number,
1178 mutex_lock(&port_extra->modelock);
1179 if (!port_extra->open_count) {
1180 dbg("%s(): port not open", __func__);
1184 result = usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0),
1185 QT2_BREAK_CONTROL, 0x40, break_value,
1186 port->number, NULL, 0, 300);
1188 mutex_unlock(&port_extra->modelock);
1192 * qt2_throttle: - stop reading new data from the port
1194 static void qt2_throttle(struct tty_struct *tty)
1196 struct usb_serial_port *port = tty->driver_data;
1197 struct usb_serial *serial = port->serial;
1198 struct quatech2_port *port_extra; /* extra data for this port */
1200 port_extra = qt2_get_port_private(port);
1202 dbg("%s(): enter port %d no serial object", __func__,
1207 mutex_lock(&port_extra->modelock); /* lock structure */
1208 if (!port_extra->open_count) {
1209 dbg("%s(): port not open", __func__);
1212 /* Send command to box to stop receiving stuff. This will stop this
1213 * particular UART from filling the endpoint - in the multiport case the
1214 * FPGA UART will handle any flow control implemented, but for the single
1215 * port it's handed differently and we just quit submitting urbs
1217 if (serial->dev->descriptor.idProduct != QUATECH_SSU2_100)
1218 qt2_boxstoprx(serial, port->number, 1);
1220 port->throttled = 1;
1222 mutex_unlock(&port_extra->modelock);
1223 dbg("%s(): port %d: setting port->throttled", __func__, port->number);
1228 * qt2_unthrottle: - start receiving data through the port again after being
1231 static void qt2_unthrottle(struct tty_struct *tty)
1233 struct usb_serial_port *port = tty->driver_data;
1234 struct usb_serial *serial = port->serial;
1235 struct quatech2_port *port_extra; /* extra data for this port */
1236 struct usb_serial_port *port0; /* first port structure on device */
1237 struct quatech2_dev *dev_extra; /* extra data for the device */
1240 dbg("%s() enter port %d no serial object!", __func__,
1244 dev_extra = qt2_get_dev_private(serial);
1245 port_extra = qt2_get_port_private(port);
1246 port0 = serial->port[0]; /* get the first port's device structure */
1248 mutex_lock(&port_extra->modelock);
1249 if (!port_extra->open_count) {
1250 dbg("%s(): port %d not open", __func__, port->number);
1254 if (port->throttled != 0) {
1255 dbg("%s(): port %d: unsetting port->throttled", __func__,
1257 port->throttled = 0;
1258 /* Send command to box to start receiving stuff */
1259 if (serial->dev->descriptor.idProduct != QUATECH_SSU2_100) {
1260 qt2_boxstoprx(serial, port->number, 0);
1261 } else if (dev_extra->ReadBulkStopped == true) {
1262 usb_fill_bulk_urb(port0->read_urb, serial->dev,
1263 usb_rcvbulkpipe(serial->dev,
1264 port0->bulk_in_endpointAddress),
1265 port0->bulk_in_buffer,
1266 port0->bulk_in_size,
1267 qt2_read_bulk_callback,
1272 mutex_unlock(&port_extra->modelock);
1276 /* internal, private helper functions for the driver */
1278 /* Power up the FPGA in the box to get it working */
1279 static int qt2_boxpoweron(struct usb_serial *serial)
1284 Direcion = USBD_TRANSFER_DIRECTION_OUT;
1285 pipe = usb_rcvctrlpipe(serial->dev, 0);
1286 result = usb_control_msg(serial->dev, pipe, QT_SET_GET_DEVICE,
1287 Direcion, QU2BOXPWRON, 0x00, NULL, 0x00,
1293 * qt2_boxsetQMCR Issue a QT2_GET_SET_QMCR vendor-spcific request on the
1294 * default control pipe. If successful return the number of bytes written,
1295 * otherwise return a negative error number of the problem.
1297 static int qt2_boxsetQMCR(struct usb_serial *serial, __u16 Uart_Number,
1303 PortSettings = (__u16)(QMCR_Value);
1305 dbg("%s(): Port = %d, PortSettings = 0x%x", __func__,
1306 Uart_Number, PortSettings);
1308 result = usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0),
1309 QT2_GET_SET_QMCR, 0x40, PortSettings,
1310 (__u16)Uart_Number, NULL, 0, 5000);
1314 static int port_paranoia_check(struct usb_serial_port *port,
1315 const char *function)
1318 dbg("%s - port == NULL", function);
1321 if (!port->serial) {
1322 dbg("%s - port->serial == NULL\n", function);
1328 static int serial_paranoia_check(struct usb_serial *serial,
1329 const char *function)
1332 dbg("%s - serial == NULL\n", function);
1336 if (!serial->type) {
1337 dbg("%s - serial->type == NULL!", function);
1344 static inline struct quatech2_port *qt2_get_port_private(struct usb_serial_port
1347 return (struct quatech2_port *)usb_get_serial_port_data(port);
1350 static inline void qt2_set_port_private(struct usb_serial_port *port,
1351 struct quatech2_port *data)
1353 usb_set_serial_port_data(port, (void *)data);
1356 static inline struct quatech2_dev *qt2_get_dev_private(struct usb_serial
1359 return (struct quatech2_dev *)usb_get_serial_data(serial);
1361 static inline void qt2_set_dev_private(struct usb_serial *serial,
1362 struct quatech2_dev *data)
1364 usb_set_serial_data(serial, (void *)data);
1367 static int qt2_openboxchannel(struct usb_serial *serial, __u16
1368 Uart_Number, struct qt2_status_data *status)
1374 length = sizeof(struct qt2_status_data);
1375 Direcion = USBD_TRANSFER_DIRECTION_IN;
1376 pipe = usb_rcvctrlpipe(serial->dev, 0);
1377 result = usb_control_msg(serial->dev, pipe, QT_OPEN_CLOSE_CHANNEL,
1378 Direcion, 0x00, Uart_Number, status, length, 5000);
1381 static int qt2_closeboxchannel(struct usb_serial *serial, __u16 Uart_Number)
1386 direcion = USBD_TRANSFER_DIRECTION_OUT;
1387 pipe = usb_sndctrlpipe(serial->dev, 0);
1388 result = usb_control_msg(serial->dev, pipe, QT_OPEN_CLOSE_CHANNEL,
1389 direcion, 0, Uart_Number, NULL, 0, 5000);
1393 /* qt2_conf_uart Issue a SET_UART vendor-spcific request on the default
1394 * control pipe. If successful sets baud rate divisor and LCR value
1396 static int qt2_conf_uart(struct usb_serial *serial, unsigned short Uart_Number,
1397 unsigned short divisor, unsigned char LCR)
1400 unsigned short UartNumandLCR;
1402 UartNumandLCR = (LCR << 8) + Uart_Number;
1404 result = usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0),
1405 QT2_GET_SET_UART, 0x40, divisor, UartNumandLCR,
1410 /** @brief Callback for asynchronous submission of read URBs on bulk in
1413 * Registered in qt2_open_port(), used to deal with incomming data
1416 static void qt2_read_bulk_callback(struct urb *urb)
1418 /* Get the device pointer (struct usb_serial) back out of the URB */
1419 struct usb_serial *serial = urb->context;
1420 /* get the extra struct for the device */
1421 struct quatech2_dev *dev_extra = qt2_get_dev_private(serial);
1422 /* Get first port structure from the device */
1423 struct usb_serial_port *port0 = serial->port[0];
1424 /* Get the currently active port structure from serial struct */
1425 struct usb_serial_port *active = dev_extra->current_port;
1426 /* get the extra struct for port 0 */
1427 struct quatech2_port *port0_extra = qt2_get_port_private(port0);
1428 /* and for the currently active port */
1429 struct quatech2_port *active_extra = qt2_get_port_private(active);
1430 /* When we finally get to doing some tty stuff, we will need this */
1431 struct tty_struct *tty_st;
1432 unsigned int RxCount; /* the length of the data to process */
1433 unsigned int i; /* loop counter over the data to process */
1434 int result; /* return value cache variable */
1435 bool escapeflag; /* flag set to true if this loop iteration is
1436 * parsing an escape sequence, rather than
1438 dbg("%s(): callback running, active port is %d", __func__,
1442 /* read didn't go well */
1443 dev_extra->ReadBulkStopped = true;
1444 dbg("%s(): nonzero bulk read status received: %d",
1445 __func__, urb->status);
1449 /* inline port_sofrint() here */
1450 if (port_paranoia_check(port0, __func__) != 0) {
1451 dbg("%s - port_paranoia_check on port0 failed, exiting\n",
1455 if (port_paranoia_check(active, __func__) != 0) {
1456 dbg("%s - port_paranoia_check on current_port "
1457 "failed, exiting", __func__);
1461 /* This single callback function has to do for all the ports on
1462 * the device. Data being read up the USB can contain certain
1463 * escape sequences which are used to communicate out-of-band
1464 * information from the serial port in-band over the USB.
1465 * These escapes include sending modem and flow control line
1466 * status, and switching the port. The concept of a "Current Port"
1467 * is used, which is where data is going until a port change
1468 * escape seqence is received. This Current Port is kept between
1469 * callbacks so that when this function enters we know which the
1470 * currently active port is and can get to work right away without
1471 * the box having to send repeat escape sequences (anyway, how
1472 * would it know to do so?).
1475 if (active_extra->close_pending == true) {
1476 /* We are closing , stop reading */
1477 dbg("%s - (active->close_pending == true", __func__);
1478 if (dev_extra->open_ports <= 0) {
1479 /* If this is the only port left open - stop the
1481 dev_extra->ReadBulkStopped = true;
1482 dbg("%s - (ReadBulkStopped == true;", __func__);
1488 * RxHolding is asserted by throttle, if we assert it, we're not
1489 * receiving any more characters and let the box handle the flow
1492 if ((port0_extra->RxHolding == true) &&
1493 (serial->dev->descriptor.idProduct == QUATECH_SSU2_100)) {
1494 /* single port device, input is already stopped, so we don't
1495 * need any more input data */
1496 dev_extra->ReadBulkStopped = true;
1499 /* finally, we are in a situation where we might consider the data
1500 * that is contained within the URB, and what to do about it.
1501 * This is likely to involved communicating up to the TTY layer, so
1502 * we will need to get hold of the tty for the port we are currently
1505 /* active is a usb_serial_port. It has a member port which is a
1506 * tty_port. From this we get a tty_struct pointer which is what we
1507 * actually wanted, and keep it on tty_st */
1508 tty_st = tty_port_tty_get(&active->port);
1510 dbg("%s - bad tty pointer - exiting", __func__);
1513 RxCount = urb->actual_length; /* grab length of data handy */
1516 /* skip all this if no data to process */
1517 for (i = 0; i < RxCount ; ++i) {
1518 /* Look ahead code here -works on several bytes at onc*/
1519 if ((i <= (RxCount - 3)) && (THISCHAR == 0x1b)
1520 && (NEXTCHAR == 0x1b)) {
1521 /* we are in an escape sequence, type
1522 * determined by the 3rd char */
1524 switch (THIRDCHAR) {
1526 /* Line status change 4th byte must
1528 if (i > (RxCount - 4)) {
1529 dbg("Illegal escape sequences "
1530 "in received data");
1533 qt2_process_line_status(active,
1539 /* Modem status status change 4th byte
1541 if (i > (RxCount - 4)) {
1542 dbg("Illegal escape sequences "
1543 "in received data");
1546 qt2_process_modem_status(active,
1552 /* xmit hold empty 4th byte
1554 if (i > (RxCount - 4)) {
1555 dbg("Illegal escape sequences "
1556 "in received data");
1559 qt2_process_xmit_empty(active,
1560 FOURTHCHAR, FIFTHCHAR);
1565 /* Port number change 4th byte
1567 if (i > (RxCount - 4)) {
1568 dbg("Illegal escape sequences "
1569 "in received data");
1572 /* Port change. If port open push
1573 * current data up to tty layer */
1574 if (active_extra->open_count > 0)
1575 tty_flip_buffer_push(tty_st);
1577 dbg("Port Change: new port = %d",
1579 qt2_process_port_change(active,
1583 /* having changed port, the pointers for
1584 * the currently active port are all out
1585 * of date and need updating */
1586 active = dev_extra->current_port;
1588 qt2_get_port_private(active);
1589 tty_st = tty_port_tty_get(
1593 /* Recv flush 3rd byte must
1595 if (i > (RxCount - 3)) {
1596 dbg("Illegal escape sequences "
1597 "in received data");
1600 qt2_process_rcv_flush(active);
1605 /* xmit flush 3rd byte must follow */
1606 if (i > (RxCount - 3)) {
1607 dbg("Illegal escape sequences "
1608 "in received data");
1611 qt2_process_xmit_flush(active);
1616 dbg("No status sequence");
1617 qt2_process_rx_char(active, THISCHAR);
1618 qt2_process_rx_char(active, NEXTCHAR);
1622 qt2_process_rx_char(active, THISCHAR);
1626 if (escapeflag == true)
1628 /* if we did an escape char, we don't need
1629 * to mess around pushing data through the
1630 * tty layer, and can go round again */
1632 if (tty_st && urb->actual_length) {
1633 tty_buffer_request_room(tty_st, 1);
1634 tty_insert_flip_string(tty_st, &(
1636 (urb->transfer_buffer)
1640 tty_flip_buffer_push(tty_st);
1643 /* at this point we have complete dealing with the data for this
1644 * callback. All we have to do now is to start the async read process
1645 * back off again. */
1647 usb_fill_bulk_urb(port0->read_urb, serial->dev,
1648 usb_rcvbulkpipe(serial->dev, port0->bulk_in_endpointAddress),
1649 port0->bulk_in_buffer, port0->bulk_in_size,
1650 qt2_read_bulk_callback, serial);
1651 result = usb_submit_urb(port0->read_urb, GFP_ATOMIC);
1653 dbg("%s(): failed resubmitting read urb, error %d",
1656 dbg("%s() successfully resubmitted read urb", __func__);
1657 if (tty_st && RxCount) {
1658 /* if some inbound data was processed, then
1659 * we need to push that through the tty layer
1661 tty_flip_buffer_push(tty_st);
1662 tty_schedule_flip(tty_st);
1666 /* cribbed from serqt_usb2 driver, but not sure which work needs
1667 * scheduling - port0 or currently active port? */
1668 /* schedule_work(&port->work); */
1672 /** @brief Callback for asynchronous submission of write URBs on bulk in
1675 * Registered in qt2_write(), used to deal with outgoing data
1678 static void qt2_write_bulk_callback(struct urb *urb)
1680 struct usb_serial_port *port = (struct usb_serial_port *)urb->context;
1681 struct usb_serial *serial = port->serial;
1684 dbg("%s(): bad serial pointer, exiting", __func__);
1688 dbg("%s(): nonzero write bulk status received: %d",
1689 __func__, urb->status);
1692 /* FIXME What is supposed to be going on here?
1693 * does this actually do anything useful, and should it?
1695 /*port_softint((void *) serial); commented in vendor driver */
1696 schedule_work(&port->work);
1700 static void qt2_process_line_status(struct usb_serial_port *port,
1701 unsigned char LineStatus)
1703 /* obtain the private structure for the port */
1704 struct quatech2_port *port_extra = qt2_get_port_private(port);
1705 port_extra->shadowLSR = LineStatus & (QT2_SERIAL_LSR_OE |
1706 QT2_SERIAL_LSR_PE | QT2_SERIAL_LSR_FE | QT2_SERIAL_LSR_BI);
1708 static void qt2_process_modem_status(struct usb_serial_port *port,
1709 unsigned char ModemStatus)
1711 /* obtain the private structure for the port */
1712 struct quatech2_port *port_extra = qt2_get_port_private(port);
1713 port_extra->shadowMSR = ModemStatus;
1714 wake_up_interruptible(&port_extra->wait);
1715 /* this wakes up the otherwise indefinitely waiting code for
1716 * the TIOCMIWAIT ioctl, so that it can notice that
1717 * port_extra->shadowMSR has changed and the ioctl needs to return.
1721 static void qt2_process_xmit_empty(struct usb_serial_port *port,
1722 unsigned char fourth_char, unsigned char fifth_char)
1725 /* obtain the private structure for the port */
1726 struct quatech2_port *port_extra = qt2_get_port_private(port);
1728 byte_count = (int)(fifth_char * 16);
1729 byte_count += (int)fourth_char;
1730 /* byte_count indicates how many bytes the device has written out. This
1731 * message appears to occur regularly, and is used in the vendor driver
1732 * to keep track of the fill state of the port transmit buffer */
1733 port_extra->tx_pending_bytes -= byte_count;
1734 /* reduce the stored data queue length by the known number of bytes
1736 dbg("port %d: %d bytes reported sent, %d still pending", port->number,
1737 byte_count, port_extra->tx_pending_bytes);
1739 /*port_extra->xmit_fifo_room_bytes = FIFO_DEPTH; ???*/
1742 static void qt2_process_port_change(struct usb_serial_port *port,
1743 unsigned char New_Current_Port)
1745 /* obtain the parent usb serial device structure */
1746 struct usb_serial *serial = port->serial;
1747 /* obtain the private structure for the device */
1748 struct quatech2_dev *dev_extra = qt2_get_dev_private(serial);
1749 dev_extra->current_port = serial->port[New_Current_Port];
1750 /* what should I do with this? commented out in upstream
1752 /*schedule_work(&port->work);*/
1755 static void qt2_process_rcv_flush(struct usb_serial_port *port)
1757 /* obtain the private structure for the port */
1758 struct quatech2_port *port_extra = qt2_get_port_private(port);
1759 port_extra->rcv_flush = true;
1761 static void qt2_process_xmit_flush(struct usb_serial_port *port)
1763 /* obtain the private structure for the port */
1764 struct quatech2_port *port_extra = qt2_get_port_private(port);
1765 port_extra->xmit_flush = true;
1768 static void qt2_process_rx_char(struct usb_serial_port *port,
1771 /* get the tty_struct for this port */
1772 struct tty_struct *tty = tty_port_tty_get(&(port->port));
1773 /* get the URB with the data in to push */
1774 struct urb *urb = port->serial->port[0]->read_urb;
1776 if (tty && urb->actual_length) {
1777 tty_buffer_request_room(tty, 1);
1778 tty_insert_flip_string(tty, &data, 1);
1779 /* should this be commented out here? */
1780 /*tty_flip_buffer_push(tty);*/
1784 /** @brief Retrieve the value of a register from the device
1786 * Issues a GET_REGISTER vendor-spcific request over the USB control
1787 * pipe to obtain a value back from a specific register on a specific
1789 * @param serial Serial device handle to access the device through
1790 * @param uart_number Which UART the value is wanted from
1791 * @param register_num Which register to read the value from
1792 * @param pValue Pointer to somewhere to put the retrieved value
1794 static int qt2_box_get_register(struct usb_serial *serial,
1795 unsigned char uart_number, unsigned short register_num,
1799 result = usb_control_msg(serial->dev, usb_rcvctrlpipe(serial->dev, 0),
1800 QT2_GET_SET_REGISTER, 0xC0, register_num,
1801 uart_number, (void *)pValue, sizeof(*pValue), 300);
1805 /** qt2_box_set_register
1806 * Issue a SET_REGISTER vendor-specific request on the default control pipe
1808 static int qt2_box_set_register(struct usb_serial *serial,
1809 unsigned short Uart_Number, unsigned short Register_Num,
1810 unsigned short Value)
1813 unsigned short reg_and_byte;
1815 reg_and_byte = Value;
1816 reg_and_byte = reg_and_byte << 8;
1817 reg_and_byte = reg_and_byte + Register_Num;
1819 result = usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0),
1820 QT2_GET_SET_REGISTER, 0x40, reg_and_byte,
1821 Uart_Number, NULL, 0, 300);
1825 /** qt2_boxsetuart - Issue a SET_UART vendor-spcific request on the default
1826 * control pipe. If successful sets baud rate divisor and LCR value.
1828 static int qt2_boxsetuart(struct usb_serial *serial, unsigned short Uart_Number,
1829 unsigned short default_divisor, unsigned char default_LCR)
1831 unsigned short UartNumandLCR;
1833 UartNumandLCR = (default_LCR << 8) + Uart_Number;
1835 return usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0),
1836 QT2_GET_SET_UART, 0x40, default_divisor, UartNumandLCR,
1840 /** qt2_boxsethw_flowctl - Turn hardware (RTS/CTS) flow control on and off for
1843 static int qt2_boxsethw_flowctl(struct usb_serial *serial,
1844 unsigned int UartNumber, bool bSet)
1848 __u16 MOUT_Value = 0;
1851 MCR_Value = QT2_SERIAL_MCR_RTS;
1852 /* flow control, box will clear RTS line to prevent remote
1853 * device from transmitting more chars */
1855 /* no flow control to remote device */
1858 MOUT_Value = MCR_Value << 8;
1861 MSR_Value = QT2_SERIAL_MSR_CTS;
1862 /* flow control on, box will inhibit tx data if CTS line is
1865 /* Box will not inhibit tx data due to CTS line */
1868 MOUT_Value |= MSR_Value;
1869 return usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0),
1870 QT2_HW_FLOW_CONTROL_MASK, 0x40, MOUT_Value, UartNumber,
1874 /** qt2_boxsetsw_flowctl - Turn software (XON/XOFF) flow control on for
1875 * a hardware UART, and set the XON and XOFF characters.
1877 static int qt2_boxsetsw_flowctl(struct usb_serial *serial, __u16 UartNumber,
1878 unsigned char stop_char, unsigned char start_char)
1882 nSWflowout = start_char << 8;
1883 nSWflowout = (unsigned short)stop_char;
1884 return usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0),
1885 QT2_SW_FLOW_CONTROL_MASK, 0x40, nSWflowout, UartNumber,
1889 /** qt2_boxunsetsw_flowctl - Turn software (XON/XOFF) flow control off for
1892 static int qt2_boxunsetsw_flowctl(struct usb_serial *serial, __u16 UartNumber)
1894 return usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0),
1895 QT2_SW_FLOW_CONTROL_DISABLE, 0x40, 0, UartNumber, NULL,
1900 * qt2_boxstoprx - Start and stop reception of data by the FPGA UART in
1901 * response to requests from the tty layer
1902 * @serial: pointer to the usb_serial structure for the parent device
1903 * @uart_number: which UART on the device we are addressing
1904 * @stop: Whether to start or stop data reception. Set to 1 to stop data being
1905 * received, and to 0 to start it being received.
1907 static int qt2_boxstoprx(struct usb_serial *serial, unsigned short uart_number,
1908 unsigned short stop)
1910 return usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0),
1911 QT2_STOP_RECEIVE, 0x40, stop, uart_number, NULL, 0, 300);
1916 * last things in file: stuff to register this driver into the generic
1917 * USB serial framework.
1920 static struct usb_serial_driver quatech2_device = {
1922 .owner = THIS_MODULE,
1923 .name = "quatech_usb2",
1925 .description = DRIVER_DESC,
1926 .id_table = quausb2_id_table,
1931 .write_room = qt2_write_room,
1932 .chars_in_buffer = qt2_chars_in_buffer,
1933 .throttle = qt2_throttle,
1934 .unthrottle = qt2_unthrottle,
1935 .calc_num_ports = qt2_calc_num_ports,
1937 .set_termios = qt2_set_termios,
1938 .break_ctl = qt2_break,
1939 .tiocmget = qt2_tiocmget,
1940 .tiocmset = qt2_tiocmset,
1941 .attach = qt2_attach,
1942 .release = qt2_release,
1943 .read_bulk_callback = qt2_read_bulk_callback,
1944 .write_bulk_callback = qt2_write_bulk_callback,
1947 static struct usb_serial_driver * const serial_drivers[] = {
1948 &quatech2_device, NULL
1951 module_usb_serial_driver(quausb2_usb_driver, serial_drivers);
1953 MODULE_AUTHOR(DRIVER_AUTHOR);
1954 MODULE_DESCRIPTION(DRIVER_DESC);
1955 MODULE_LICENSE("GPL");
1957 module_param(debug, bool, S_IRUGO | S_IWUSR);
1958 MODULE_PARM_DESC(debug, "Debug enabled or not");