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
.probe = usb_serial_probe,
136
.disconnect = usb_serial_disconnect,
137
.id_table = quausb2_id_table,
142
* quatech2_port: Structure in which to keep all the messy stuff that this
143
* driver needs alongside the usb_serial_port structure
144
* @read_urb_busy: Flag indicating that port->read_urb is in use
145
* @close_pending: flag indicating that this port is in the process of
146
* being closed (and so no new reads / writes should be started).
147
* @shadowLSR: Last received state of the line status register, holds the
148
* value of the line status flags from the port
149
* @shadowMSR: Last received state of the modem status register, holds
150
* the value of the modem status received from the port
151
* @rcv_flush: Flag indicating that a receive flush has occurred on
153
* @xmit_flush: Flag indicating that a transmit flush has been processed by
155
* @tx_pending_bytes: Number of bytes waiting to be sent. This total
156
* includes the size (excluding header) of URBs that have been submitted but
157
* have not yet been sent to to the device, and bytes that have been sent out
158
* of the port but not yet reported sent by the "xmit_empty" messages (which
159
* indicate the number of bytes sent each time they are received, despite the
161
* - Starts at zero when port is initialised.
162
* - is incremented by the size of the data to be written (no headers)
163
* each time a write urb is dispatched.
164
* - is decremented each time a "transmit empty" message is received
165
* by the driver in the data stream.
166
* @lock: Mutex to lock access to this structure when we need to ensure that
167
* races don't occur to access bits of it.
168
* @open_count: The number of uses of the port currently having
169
* it open, i.e. the reference count.
171
struct quatech2_port {
179
int tx_pending_bytes;
180
struct mutex modelock;
183
char active; /* someone has this device open */
184
unsigned char *xfer_to_tty_buffer;
185
wait_queue_head_t wait;
186
__u8 shadowLCR; /* last LCR value received */
187
__u8 shadowMCR; /* last MCR value received */
189
struct semaphore pend_xmit_sem; /* locks this structure */
194
* Structure to hold device-wide internal status information
195
* @param ReadBulkStopped The last bulk read attempt ended in tears
196
* @param open_ports The number of serial ports currently in use on the box
197
* @param current_port Pointer to the serial port structure of the port which
198
* the read stream is currently directed to. Escape sequences in the read
199
* stream will change this around as data arrives from different ports on the
201
* @buffer_size: The max size buffer each URB can take, used to set the size of
202
* the buffers allocated for writing to each port on the device (we need to
203
* store this because it is known only to the endpoint, but used each time a
204
* port is opened and a new buffer is allocated.
206
struct quatech2_dev {
207
bool ReadBulkStopped;
209
struct usb_serial_port *current_port;
213
/* structure which holds line and modem status flags */
214
struct qt2_status_data {
219
/* Function prototypes */
220
static int qt2_boxpoweron(struct usb_serial *serial);
221
static int qt2_boxsetQMCR(struct usb_serial *serial, __u16 Uart_Number,
223
static int port_paranoia_check(struct usb_serial_port *port,
224
const char *function);
225
static int serial_paranoia_check(struct usb_serial *serial,
226
const char *function);
227
static inline struct quatech2_port *qt2_get_port_private(struct usb_serial_port
229
static inline void qt2_set_port_private(struct usb_serial_port *port,
230
struct quatech2_port *data);
231
static inline struct quatech2_dev *qt2_get_dev_private(struct usb_serial
233
static inline void qt2_set_dev_private(struct usb_serial *serial,
234
struct quatech2_dev *data);
235
static int qt2_openboxchannel(struct usb_serial *serial, __u16
236
Uart_Number, struct qt2_status_data *pDeviceData);
237
static int qt2_closeboxchannel(struct usb_serial *serial, __u16
239
static int qt2_conf_uart(struct usb_serial *serial, unsigned short Uart_Number,
240
unsigned short divisor, unsigned char LCR);
241
static void qt2_read_bulk_callback(struct urb *urb);
242
static void qt2_write_bulk_callback(struct urb *urb);
243
static void qt2_process_line_status(struct usb_serial_port *port,
244
unsigned char LineStatus);
245
static void qt2_process_modem_status(struct usb_serial_port *port,
246
unsigned char ModemStatus);
247
static void qt2_process_xmit_empty(struct usb_serial_port *port,
248
unsigned char fourth_char, unsigned char fifth_char);
249
static void qt2_process_port_change(struct usb_serial_port *port,
250
unsigned char New_Current_Port);
251
static void qt2_process_rcv_flush(struct usb_serial_port *port);
252
static void qt2_process_xmit_flush(struct usb_serial_port *port);
253
static void qt2_process_rx_char(struct usb_serial_port *port,
255
static int qt2_box_get_register(struct usb_serial *serial,
256
unsigned char uart_number, unsigned short register_num,
258
static int qt2_box_set_register(struct usb_serial *serial,
259
unsigned short Uart_Number, unsigned short Register_Num,
260
unsigned short Value);
261
static int qt2_boxsetuart(struct usb_serial *serial, unsigned short Uart_Number,
262
unsigned short default_divisor, unsigned char default_LCR);
263
static int qt2_boxsethw_flowctl(struct usb_serial *serial,
264
unsigned int UartNumber, bool bSet);
265
static int qt2_boxsetsw_flowctl(struct usb_serial *serial, __u16 UartNumber,
266
unsigned char stop_char, unsigned char start_char);
267
static int qt2_boxunsetsw_flowctl(struct usb_serial *serial, __u16 UartNumber);
268
static int qt2_boxstoprx(struct usb_serial *serial, unsigned short uart_number,
269
unsigned short stop);
271
/* implementation functions, roughly in order of use, are here */
272
static int qt2_calc_num_ports(struct usb_serial *serial)
276
switch (serial->dev->descriptor.idProduct) {
277
case QUATECH_SSU2_100:
281
case QUATECH_DSU2_400:
283
case QUATECH_DSU2_100:
287
case QUATECH_QSU2_400:
289
case QUATECH_QSU2_100:
293
case QUATECH_ESU2_400:
295
case QUATECH_ESU2_100:
305
static int qt2_attach(struct usb_serial *serial)
307
struct usb_serial_port *port;
308
struct quatech2_port *qt2_port; /* port-specific private data pointer */
309
struct quatech2_dev *qt2_dev; /* dev-specific private data pointer */
311
/* stuff for storing endpoint addresses now */
312
struct usb_endpoint_descriptor *endpoint;
313
struct usb_host_interface *iface_desc;
314
struct usb_serial_port *port0; /* first port structure on device */
316
/* check how many endpoints there are on the device, for
318
dbg("%s(): Endpoints: %d bulk in, %d bulk out, %d interrupt in",
319
__func__, serial->num_bulk_in,
320
serial->num_bulk_out, serial->num_interrupt_in);
321
if ((serial->num_bulk_in != 1) || (serial->num_bulk_out != 1)) {
322
dbg("Device has wrong number of bulk endpoints!");
325
iface_desc = serial->interface->cur_altsetting;
327
/* Set up per-device private data, storing extra data alongside
328
* struct usb_serial */
329
qt2_dev = kzalloc(sizeof(*qt2_dev), GFP_KERNEL);
331
dbg("%s: kmalloc for quatech2_dev failed!",
335
qt2_dev->open_ports = 0; /* no ports open */
336
qt2_set_dev_private(serial, qt2_dev); /* store private data */
338
/* Now setup per port private data, which replaces all the things
339
* that quatech added to standard kernel structures in their driver */
340
for (i = 0; i < serial->num_ports; i++) {
341
port = serial->port[i];
342
qt2_port = kzalloc(sizeof(*qt2_port), GFP_KERNEL);
344
dbg("%s: kmalloc for quatech2_port (%d) failed!.",
348
/* initialise stuff in the structure */
349
qt2_port->open_count = 0; /* port is not open */
350
spin_lock_init(&qt2_port->lock);
351
mutex_init(&qt2_port->modelock);
352
qt2_set_port_private(port, qt2_port);
355
/* gain access to port[0]'s structure because we want to store
356
* device-level stuff in it */
357
if (serial_paranoia_check(serial, __func__))
359
port0 = serial->port[0]; /* get the first port's device structure */
361
/* print endpoint addresses so we can check them later
363
for (i = 0; i < iface_desc->desc.bNumEndpoints; ++i) {
364
endpoint = &iface_desc->endpoint[i].desc;
365
if ((endpoint->bEndpointAddress & 0x80) &&
366
((endpoint->bmAttributes & 3) == 0x02)) {
367
/* we found a bulk in endpoint */
368
dbg("found bulk in at %#.2x",
369
endpoint->bEndpointAddress);
372
if (((endpoint->bEndpointAddress & 0x80) == 0x00) &&
373
((endpoint->bmAttributes & 3) == 0x02)) {
374
/* we found a bulk out endpoint */
375
dbg("found bulk out at %#.2x",
376
endpoint->bEndpointAddress);
377
qt2_dev->buffer_size = endpoint->wMaxPacketSize;
378
/* max size of URB needs recording for the device */
380
} /* end printing endpoint addresses */
382
/* switch on power to the hardware */
383
if (qt2_boxpoweron(serial) < 0) {
384
dbg("qt2_boxpoweron() failed");
387
/* set all ports to RS232 mode */
388
for (i = 0; i < serial->num_ports; ++i) {
389
if (qt2_boxsetQMCR(serial, i, QU2BOX232) < 0) {
390
dbg("qt2_boxsetQMCR() on port %d failed",
399
for (i = 0; i < serial->num_ports; i++) {
400
port = serial->port[i];
401
qt2_port = qt2_get_port_private(port);
403
qt2_set_port_private(port, NULL);
405
qt2_dev = qt2_get_dev_private(serial);
407
qt2_set_dev_private(serial, NULL);
409
dbg("Exit fail %s\n", __func__);
413
static void qt2_release(struct usb_serial *serial)
415
struct usb_serial_port *port;
416
struct quatech2_port *qt_port;
419
dbg("enterting %s", __func__);
421
for (i = 0; i < serial->num_ports; i++) {
422
port = serial->port[i];
426
qt_port = usb_get_serial_port_data(port);
428
usb_set_serial_port_data(port, NULL);
431
/* This function is called once per serial port on the device, when
432
* that port is opened by a userspace application.
433
* The tty_struct and the usb_serial_port belong to this port,
434
* i.e. there are multiple ones for a multi-port device.
435
* However the usb_serial_port structure has a back-pointer
436
* to the parent usb_serial structure which belongs to the device,
437
* so we can access either the device-wide information or
438
* any other port's information (because there are also forward
439
* pointers) via that pointer.
440
* This is most helpful if the device shares resources (e.g. end
441
* points) between different ports
443
int qt2_open(struct tty_struct *tty, struct usb_serial_port *port)
445
struct usb_serial *serial; /* device structure */
446
struct usb_serial_port *port0; /* first port structure on device */
447
struct quatech2_port *port_extra; /* extra data for this port */
448
struct quatech2_port *port0_extra; /* extra data for first port */
449
struct quatech2_dev *dev_extra; /* extra data for the device */
450
struct qt2_status_data ChannelData;
451
unsigned short default_divisor = QU2BOXSPD9600;
452
unsigned char default_LCR = QT2_SERIAL_8_DATA;
456
if (port_paranoia_check(port, __func__))
459
dbg("%s(): port %d", __func__, port->number);
461
serial = port->serial; /* get the parent device structure */
462
if (serial_paranoia_check(serial, __func__)) {
463
dbg("usb_serial struct failed sanity check");
466
dev_extra = qt2_get_dev_private(serial);
467
/* get the device private data */
468
if (dev_extra == NULL) {
469
dbg("device extra data pointer is null");
472
port0 = serial->port[0]; /* get the first port's device structure */
473
if (port_paranoia_check(port0, __func__)) {
474
dbg("port0 usb_serial_port struct failed sanity check");
478
port_extra = qt2_get_port_private(port);
479
port0_extra = qt2_get_port_private(port0);
480
if (port_extra == NULL || port0_extra == NULL) {
481
dbg("failed to get private data for port or port0");
485
/* FIXME: are these needed? Does it even do anything useful? */
486
/* get the modem and line status values from the UART */
487
status = qt2_openboxchannel(serial, port->number,
490
dbg("qt2_openboxchannel on channel %d failed",
494
port_extra->shadowLSR = ChannelData.line_status &
495
(QT2_SERIAL_LSR_OE | QT2_SERIAL_LSR_PE |
496
QT2_SERIAL_LSR_FE | QT2_SERIAL_LSR_BI);
497
port_extra->shadowMSR = ChannelData.modem_status &
498
(QT2_SERIAL_MSR_CTS | QT2_SERIAL_MSR_DSR |
499
QT2_SERIAL_MSR_RI | QT2_SERIAL_MSR_CD);
501
/* port_extra->fifo_empty_flag = true;*/
502
dbg("qt2_openboxchannel on channel %d completed.",
505
/* Set Baud rate to default and turn off flow control here */
506
status = qt2_conf_uart(serial, port->number, default_divisor,
509
dbg("qt2_conf_uart() failed on channel %d",
513
dbg("qt2_conf_uart() completed on channel %d",
517
* At this point we will need some end points to make further progress.
518
* Handlily, the correct endpoint addresses have been filled out into
519
* the usb_serial_port structure for us by the driver core, so we
520
* already have access to them.
521
* As there is only one bulk in and one bulk out end-point, these are in
522
* port[0]'s structure, and the rest are uninitialised. Handily,
523
* when we do a write to a port, we will use the same endpoint
524
* regardless of the port, with a 5-byte header added on to
525
* tell the box which port it should eventually come out of, so we only
526
* need the one set of endpoints. We will have one URB per port for
527
* writing, so that multiple ports can be writing at once.
528
* Finally we need a bulk in URB to use for background reads from the
529
* device, which will deal with uplink data from the box to host.
531
dbg("port0 bulk in endpoint is %#.2x", port0->bulk_in_endpointAddress);
532
dbg("port0 bulk out endpoint is %#.2x",
533
port0->bulk_out_endpointAddress);
535
/* set up write_urb for bulk out transfers on this port. The USB
536
* serial framework will have allocated a blank URB, buffer etc for
537
* port0 when it put the endpoints there, but not for any of the other
538
* ports on the device because there are no more endpoints. Thus we
539
* have to allocate our own URBs for ports 1-7
541
if (port->write_urb == NULL) {
542
dbg("port->write_urb == NULL, allocating one");
543
port->write_urb = usb_alloc_urb(0, GFP_KERNEL);
544
if (!port->write_urb) {
545
err("Allocating write URB failed");
548
/* buffer same size as port0 */
549
port->bulk_out_size = dev_extra->buffer_size;
550
port->bulk_out_buffer = kmalloc(port->bulk_out_size,
552
if (!port->bulk_out_buffer) {
553
err("Couldn't allocate bulk_out_buffer");
557
if (serial->dev == NULL)
558
dbg("serial->dev == NULL");
559
dbg("port->bulk_out_size is %d", port->bulk_out_size);
561
usb_fill_bulk_urb(port->write_urb, serial->dev,
562
usb_sndbulkpipe(serial->dev,
563
port0->bulk_out_endpointAddress),
564
port->bulk_out_buffer,
566
qt2_write_bulk_callback,
568
port_extra->tx_pending_bytes = 0;
570
if (dev_extra->open_ports == 0) {
571
/* this is first port to be opened, so need the read URB
572
* initialised for bulk in transfers (this is shared amongst
573
* all the ports on the device) */
574
usb_fill_bulk_urb(port0->read_urb, serial->dev,
575
usb_rcvbulkpipe(serial->dev,
576
port0->bulk_in_endpointAddress),
577
port0->bulk_in_buffer,
579
qt2_read_bulk_callback, serial);
580
dbg("port0 bulk in URB initialised");
582
/* submit URB, i.e. start reading from device (async) */
583
dev_extra->ReadBulkStopped = false;
584
port_extra->read_urb_busy = true;
585
result = usb_submit_urb(port->read_urb, GFP_KERNEL);
588
"%s(): Error %d submitting bulk in urb",
590
port_extra->read_urb_busy = false;
591
dev_extra->ReadBulkStopped = true;
594
/* When the first port is opened, initialise the value of
595
* current_port in dev_extra to this port, so it is set
596
* to something. Once the box sends data it will send the
597
* relevant escape sequences to get it to the right port anyway
599
dev_extra->current_port = port;
602
/* initialize our wait queues */
603
init_waitqueue_head(&port_extra->wait);
604
/* increment the count of openings of this port by one */
605
port_extra->open_count++;
607
/* remember to store dev_extra, port_extra and port0_extra back again at
609
qt2_set_port_private(port, port_extra);
610
qt2_set_port_private(serial->port[0], port0_extra);
611
qt2_set_dev_private(serial, dev_extra);
613
dev_extra->open_ports++; /* one more port opened */
618
/* called when a port is closed by userspace. It won't be called, however,
619
* until calls to chars_in_buffer() reveal that the port has completed
620
* sending buffered data, and there is nothing else to do. Thus we don't have
621
* to rely on forcing data through in this function. */
622
/* Setting close_pending should keep new data from being written out,
623
* once all the data in the enpoint buffers is moved out we won't get
625
/* BoxStopReceive would keep any more data from coming from a given
626
* port, but isn't called by the vendor driver, although their comments
627
* mention it. Should it be used here to stop the inbound data
630
static void qt2_close(struct usb_serial_port *port)
632
/* time out value for flush loops */
634
struct quatech2_port *port_extra; /* extra data for this port */
635
struct usb_serial *serial; /* device structure */
636
struct quatech2_dev *dev_extra; /* extra data for the device */
637
__u8 lsr_value = 0; /* value of Line Status Register */
638
int status; /* result of last USB comms function */
640
dbg("%s(): port %d", __func__, port->number);
641
serial = port->serial; /* get the parent device structure */
642
dev_extra = qt2_get_dev_private(serial);
643
/* get the device private data */
644
port_extra = qt2_get_port_private(port); /* port private data */
646
/* we can now (and only now) stop reading data */
647
port_extra->close_pending = true;
648
dbg("%s(): port_extra->close_pending = true", __func__);
649
/* although the USB side is now empty, the UART itself may
650
* still be pushing characters out over the line, so we have to
651
* wait testing the actual line status until the lines change
652
* indicating that the data is done transferring. */
653
/* FIXME: slow this polling down so it doesn't run the USB bus flat out
654
* if it actually has to spend any time in this loop (which it normally
655
* doesn't because the buffer is nearly empty) */
656
jift = jiffies + (10 * HZ); /* 10 sec timeout */
658
status = qt2_box_get_register(serial, port->number,
659
QT2_LINE_STATUS_REGISTER, &lsr_value);
661
dbg("%s(): qt2_box_get_register failed", __func__);
664
if ((lsr_value & QT2_LSR_TEMT)) {
665
dbg("UART done sending");
669
} while (jiffies <= jift);
671
status = qt2_closeboxchannel(serial, port->number);
673
dbg("%s(): port %d qt2_box_open_close_channel failed",
674
__func__, port->number);
675
/* to avoid leaking URBs, we should now free the write_urb for this
676
* port and set the pointer to null so that next time the port is opened
677
* a new URB is allocated. This avoids leaking URBs when the device is
679
usb_free_urb(port->write_urb);
680
kfree(port->bulk_out_buffer);
681
port->bulk_out_buffer = NULL;
682
port->bulk_out_size = 0;
684
/* decrement the count of openings of this port by one */
685
port_extra->open_count--;
686
/* one less overall open as well */
687
dev_extra->open_ports--;
688
dbg("%s(): Exit, dev_extra->open_ports = %d", __func__,
689
dev_extra->open_ports);
693
* qt2_write - write bytes from the tty layer out to the USB device.
694
* @buf: The data to be written, size at least count.
695
* @count: The number of bytes requested for transmission.
696
* @return The number of bytes actually accepted for transmission to the device.
698
static int qt2_write(struct tty_struct *tty, struct usb_serial_port *port,
699
const unsigned char *buf, int count)
701
struct usb_serial *serial; /* parent device struct */
702
__u8 header_array[5]; /* header used to direct writes to the correct
703
port on the device */
704
struct quatech2_port *port_extra; /* extra data for this port */
707
serial = port->serial; /* get the parent device of the port */
708
port_extra = qt2_get_port_private(port); /* port extra info */
711
dbg("%s(): port %d, requested to write %d bytes, %d already pending",
712
__func__, port->number, count, port_extra->tx_pending_bytes);
715
dbg("%s(): write request of <= 0 bytes", __func__);
716
return 0; /* no bytes written */
719
/* check if the write urb is already in use, i.e. data already being
720
* sent to this port */
721
if ((port->write_urb->status == -EINPROGRESS)) {
722
/* Fifo hasn't been emptied since last write to this port */
723
dbg("%s(): already writing, port->write_urb->status == "
724
"-EINPROGRESS", __func__);
725
/* schedule_work(&port->work); commented in vendor driver */
727
} else if (port_extra->tx_pending_bytes >= QT2_FIFO_DEPTH) {
728
/* buffer is full (==). > should not occur, but would indicate
729
* that an overflow had occurred */
730
dbg("%s(): port transmit buffer is full!", __func__);
731
/* schedule_work(&port->work); commented in vendor driver */
735
/* We must fill the first 5 bytes of anything we sent with a transmit
736
* header which directes the data to the correct port. The maximum
737
* size we can send out in one URB is port->bulk_out_size, which caps
738
* the number of bytes of real data we can send in each write. As the
739
* semantics of write allow us to write less than we were give, we cap
740
* the maximum we will ever write to the device as 5 bytes less than
741
* one URB's worth, by reducing the value of the count argument
743
if (count > port->bulk_out_size - QT2_TX_HEADER_LENGTH) {
744
count = port->bulk_out_size - QT2_TX_HEADER_LENGTH;
745
dbg("%s(): write request bigger than urb, only accepting "
746
"%d bytes", __func__, count);
748
/* we must also ensure that the FIFO at the other end can cope with the
749
* URB we send it, otherwise it will have problems. As above, we can
750
* restrict the write size by just shrinking count.*/
751
if (count > (QT2_FIFO_DEPTH - port_extra->tx_pending_bytes)) {
752
count = QT2_FIFO_DEPTH - port_extra->tx_pending_bytes;
753
dbg("%s(): not enough room in buffer, only accepting %d bytes",
756
/* now build the header for transmission */
757
header_array[0] = 0x1b;
758
header_array[1] = 0x1b;
759
header_array[2] = (__u8)port->number;
760
header_array[3] = (__u8)count;
761
header_array[4] = (__u8)count >> 8;
762
/* copy header into URB */
763
memcpy(port->write_urb->transfer_buffer, header_array,
764
QT2_TX_HEADER_LENGTH);
765
/* and actual data to write */
766
memcpy(port->write_urb->transfer_buffer + 5, buf, count);
768
dbg("%s(): first data byte to send = %#.2x", __func__, *buf);
771
usb_fill_bulk_urb(port->write_urb, serial->dev,
772
usb_sndbulkpipe(serial->dev,
773
port->bulk_out_endpointAddress),
774
port->write_urb->transfer_buffer, count + 5,
775
(qt2_write_bulk_callback), port);
776
/* send the data out the bulk port */
777
result = usb_submit_urb(port->write_urb, GFP_ATOMIC);
779
/* error couldn't submit urb */
780
result = 0; /* return 0 as nothing got written */
781
dbg("%s(): failed submitting write urb, error %d",
784
port_extra->tx_pending_bytes += count;
785
result = count; /* return number of bytes written, i.e. count */
786
dbg("%s(): submitted write urb, wrote %d bytes, "
787
"total pending bytes %d",
788
__func__, result, port_extra->tx_pending_bytes);
793
/* This is used by the next layer up to know how much space is available
794
* in the buffer on the device. It is used on a device closure to avoid
795
* calling close() until the buffer is reported to be empty.
796
* The returned value must never go down by more than the number of bytes
797
* written for correct behaviour further up the driver stack, i.e. if I call
798
* it, then write 6 bytes, then call again I should get 6 less, or possibly
799
* only 5 less if one was written in the meantime, etc. I should never get 7
800
* less (or any bigger number) because I only wrote 6 bytes.
802
static int qt2_write_room(struct tty_struct *tty)
804
struct usb_serial_port *port = tty->driver_data;
805
/* parent usb_serial_port pointer */
806
struct quatech2_port *port_extra; /* extra data for this port */
808
port_extra = qt2_get_port_private(port);
810
if (port_extra->close_pending == true) {
811
dbg("%s(): port_extra->close_pending == true", __func__);
814
/* Q: how many bytes would a write() call actually succeed in writing
815
* if it happened now?
816
* A: one QT2_FIFO_DEPTH, less the number of bytes waiting to be sent
817
* out of the port, unless this is more than the size of the
818
* write_urb output buffer less the header, which is the maximum
819
* size write we can do.
821
* Most of the implementation of this is done when writes to the device
822
* are started or terminate. When we send a write to the device, we
823
* reduce the free space count by the size of the dispatched write.
824
* When a "transmit empty" message comes back up the USB read stream,
825
* we decrement the count by the number of bytes reported sent, thus
826
* keeping track of the difference between sent and received bytes.
829
room = (QT2_FIFO_DEPTH - port_extra->tx_pending_bytes);
831
if (room > port->bulk_out_size - QT2_TX_HEADER_LENGTH)
832
room = port->bulk_out_size - QT2_TX_HEADER_LENGTH;
833
/* if more than the URB can hold, then cap to that limit */
835
dbg("%s(): port %d: write room is %d", __func__, port->number, room);
839
static int qt2_chars_in_buffer(struct tty_struct *tty)
841
struct usb_serial_port *port = tty->driver_data;
842
/* parent usb_serial_port pointer */
843
struct quatech2_port *port_extra; /* extra data for this port */
844
port_extra = qt2_get_port_private(port);
846
dbg("%s(): port %d: chars_in_buffer = %d", __func__,
847
port->number, port_extra->tx_pending_bytes);
848
return port_extra->tx_pending_bytes;
851
/* called when userspace does an ioctl() on the device. Note that
852
* TIOCMGET and TIOCMSET are filtered off to their own methods before they get
853
* here, so we don't have to handle them.
855
static int qt2_ioctl(struct tty_struct *tty,
856
unsigned int cmd, unsigned long arg)
858
struct usb_serial_port *port = tty->driver_data;
859
struct usb_serial *serial = port->serial;
860
__u8 mcr_value; /* Modem Control Register value */
861
__u8 msr_value; /* Modem Status Register value */
862
unsigned short prev_msr_value; /* Previous value of Modem Status
863
* Register used to implement waiting for a line status change to
865
struct quatech2_port *port_extra; /* extra data for this port */
866
DECLARE_WAITQUEUE(wait, current);
867
/* Declare a wait queue named "wait" */
870
unsigned int UartNumber;
874
UartNumber = tty->index - serial->minor;
875
port_extra = qt2_get_port_private(port);
877
dbg("%s(): port %d, UartNumber %d, tty =0x%p", __func__,
878
port->number, UartNumber, tty);
880
if (cmd == TIOCMBIS || cmd == TIOCMBIC) {
881
if (qt2_box_get_register(port->serial, UartNumber,
882
QT2_MODEM_CONTROL_REGISTER, &mcr_value) < 0)
884
if (copy_from_user(&value, (unsigned int *)arg,
890
if (value & TIOCM_RTS)
891
mcr_value |= QT2_SERIAL_MCR_RTS;
892
if (value & TIOCM_DTR)
893
mcr_value |= QT2_SERIAL_MCR_DTR;
894
if (value & TIOCM_LOOP)
895
mcr_value |= QT2_SERIAL_MCR_LOOP;
898
if (value & TIOCM_RTS)
899
mcr_value &= ~QT2_SERIAL_MCR_RTS;
900
if (value & TIOCM_DTR)
901
mcr_value &= ~QT2_SERIAL_MCR_DTR;
902
if (value & TIOCM_LOOP)
903
mcr_value &= ~QT2_SERIAL_MCR_LOOP;
907
} /* end of local switch on cmd */
908
if (qt2_box_set_register(port->serial, UartNumber,
909
QT2_MODEM_CONTROL_REGISTER, mcr_value) < 0) {
912
port_extra->shadowMCR = mcr_value;
915
} else if (cmd == TIOCMIWAIT) {
916
dbg("%s() port %d, cmd == TIOCMIWAIT enter",
917
__func__, port->number);
918
prev_msr_value = port_extra->shadowMSR & QT2_SERIAL_MSR_MASK;
920
__set_current_state(TASK_INTERRUPTIBLE);
922
add_wait_queue(&port_extra->wait, &wait);
924
dbg("%s(): port %d, cmd == TIOCMIWAIT here\n",
925
__func__, port->number);
926
remove_wait_queue(&port_extra->wait, &wait);
927
/* see if a signal woke us up */
928
if (signal_pending(current))
930
set_current_state(TASK_INTERRUPTIBLE);
931
msr_value = port_extra->shadowMSR & QT2_SERIAL_MSR_MASK;
932
if (msr_value == prev_msr_value) {
933
__set_current_state(TASK_RUNNING);
934
return -EIO; /* no change - error */
936
if ((arg & TIOCM_RNG &&
937
((prev_msr_value & QT2_SERIAL_MSR_RI) ==
938
(msr_value & QT2_SERIAL_MSR_RI))) ||
940
((prev_msr_value & QT2_SERIAL_MSR_DSR) ==
941
(msr_value & QT2_SERIAL_MSR_DSR))) ||
943
((prev_msr_value & QT2_SERIAL_MSR_CD) ==
944
(msr_value & QT2_SERIAL_MSR_CD))) ||
946
((prev_msr_value & QT2_SERIAL_MSR_CTS) ==
947
(msr_value & QT2_SERIAL_MSR_CTS)))) {
948
__set_current_state(TASK_RUNNING);
951
} /* end inifinite while */
952
/* FIXME: This while loop needs a way to break out if the device
953
* is disconnected while a process is waiting for the MSR to
954
* change, because once it's disconnected, it isn't going to
955
* change state ... */
957
/* any other ioctls we don't know about come here */
958
dbg("%s(): No ioctl for that one. port = %d", __func__,
964
/* Called when the user wishes to change the port settings using the termios
965
* userspace interface */
966
static void qt2_set_termios(struct tty_struct *tty,
967
struct usb_serial_port *port, struct ktermios *old_termios)
969
struct usb_serial *serial; /* parent serial device */
970
int baud, divisor, remainder;
971
unsigned char LCR_change_to = 0;
975
dbg("%s(): port %d", __func__, port->number);
977
serial = port->serial;
979
UartNumber = port->number;
981
if (old_termios && !tty_termios_hw_change(old_termios, tty->termios))
984
switch (tty->termios->c_cflag) {
986
LCR_change_to |= QT2_SERIAL_5_DATA;
989
LCR_change_to |= QT2_SERIAL_6_DATA;
992
LCR_change_to |= QT2_SERIAL_7_DATA;
996
LCR_change_to |= QT2_SERIAL_8_DATA;
1001
if (tty->termios->c_cflag & PARENB) {
1002
if (tty->termios->c_cflag & PARODD)
1003
LCR_change_to |= QT2_SERIAL_ODD_PARITY;
1005
LCR_change_to |= QT2_SERIAL_EVEN_PARITY;
1007
/* Because LCR_change_to is initialised to zero, we don't have to worry
1008
* about the case where PARENB is not set or clearing bits, because by
1009
* default all of them are cleared, turning parity off.
1010
* as we don't support mark/space parity, we should clear the
1011
* mark/space parity bit in c_cflag, so the caller can tell we have
1012
* ignored the request */
1013
tty->termios->c_cflag &= ~CMSPAR;
1015
if (tty->termios->c_cflag & CSTOPB)
1016
LCR_change_to |= QT2_SERIAL_TWO_STOPB;
1018
LCR_change_to |= QT2_SERIAL_ONE_STOPB;
1020
/* Thats the LCR stuff, next we need to work out the divisor as the
1021
* LCR and the divisor are set together */
1022
baud = tty_get_baud_rate(tty);
1024
/* pick a default, any default... */
1027
dbg("%s(): got baud = %d", __func__, baud);
1029
divisor = QT2_MAX_BAUD_RATE / baud;
1030
remainder = QT2_MAX_BAUD_RATE % baud;
1031
/* Round to nearest divisor */
1032
if (((remainder * 2) >= baud) && (baud != 110))
1034
dbg("%s(): setting divisor = %d, QT2_MAX_BAUD_RATE = %d , LCR = %#.2x",
1035
__func__, divisor, QT2_MAX_BAUD_RATE, LCR_change_to);
1037
status = qt2_boxsetuart(serial, UartNumber, (unsigned short) divisor,
1040
dbg("qt2_boxsetuart() failed");
1043
/* now encode the baud rate we actually set, which may be
1044
* different to the request */
1045
baud = QT2_MAX_BAUD_RATE / divisor;
1046
tty_encode_baud_rate(tty, baud, baud);
1049
/* Now determine flow control */
1050
if (tty->termios->c_cflag & CRTSCTS) {
1051
dbg("%s(): Enabling HW flow control port %d", __func__,
1053
/* Enable RTS/CTS flow control */
1054
status = qt2_boxsethw_flowctl(serial, UartNumber, true);
1056
dbg("qt2_boxsethw_flowctl() failed");
1060
/* Disable RTS/CTS flow control */
1061
dbg("%s(): disabling HW flow control port %d", __func__,
1063
status = qt2_boxsethw_flowctl(serial, UartNumber, false);
1065
dbg("qt2_boxsethw_flowctl failed");
1069
/* if we are implementing XON/XOFF, set the start and stop character
1071
if (I_IXOFF(tty) || I_IXON(tty)) {
1072
unsigned char stop_char = STOP_CHAR(tty);
1073
unsigned char start_char = START_CHAR(tty);
1074
status = qt2_boxsetsw_flowctl(serial, UartNumber, stop_char,
1077
dbg("qt2_boxsetsw_flowctl (enabled) failed");
1079
/* disable SW flow control */
1080
status = qt2_boxunsetsw_flowctl(serial, UartNumber);
1082
dbg("qt2_boxunsetsw_flowctl (disabling) failed");
1086
static int qt2_tiocmget(struct tty_struct *tty)
1088
struct usb_serial_port *port = tty->driver_data;
1089
struct usb_serial *serial = port->serial;
1091
__u8 mcr_value; /* Modem Control Register value */
1092
__u8 msr_value; /* Modem Status Register value */
1093
unsigned int result = 0;
1095
unsigned int UartNumber;
1100
dbg("%s(): port %d, tty =0x%p", __func__, port->number, tty);
1101
UartNumber = tty->index - serial->minor;
1102
dbg("UartNumber is %d", UartNumber);
1104
status = qt2_box_get_register(port->serial, UartNumber,
1105
QT2_MODEM_CONTROL_REGISTER, &mcr_value);
1107
status = qt2_box_get_register(port->serial, UartNumber,
1108
QT2_MODEM_STATUS_REGISTER, &msr_value);
1111
result = ((mcr_value & QT2_SERIAL_MCR_DTR) ? TIOCM_DTR : 0)
1113
| ((mcr_value & QT2_SERIAL_MCR_RTS) ? TIOCM_RTS : 0)
1115
| ((msr_value & QT2_SERIAL_MSR_CTS) ? TIOCM_CTS : 0)
1117
| ((msr_value & QT2_SERIAL_MSR_CD) ? TIOCM_CAR : 0)
1118
/*Carrier detect set */
1119
| ((msr_value & QT2_SERIAL_MSR_RI) ? TIOCM_RI : 0)
1120
/* Ring indicator set */
1121
| ((msr_value & QT2_SERIAL_MSR_DSR) ? TIOCM_DSR : 0);
1129
static int qt2_tiocmset(struct tty_struct *tty,
1130
unsigned int set, unsigned int clear)
1132
struct usb_serial_port *port = tty->driver_data;
1133
struct usb_serial *serial = port->serial;
1134
__u8 mcr_value; /* Modem Control Register value */
1136
unsigned int UartNumber;
1141
UartNumber = tty->index - serial->minor;
1142
dbg("%s(): port %d, UartNumber %d", __func__, port->number, UartNumber);
1144
status = qt2_box_get_register(port->serial, UartNumber,
1145
QT2_MODEM_CONTROL_REGISTER, &mcr_value);
1149
/* Turn off RTS, DTR and loopback, then only turn on what was asked
1151
mcr_value &= ~(QT2_SERIAL_MCR_RTS | QT2_SERIAL_MCR_DTR |
1152
QT2_SERIAL_MCR_LOOP);
1153
if (set & TIOCM_RTS)
1154
mcr_value |= QT2_SERIAL_MCR_RTS;
1155
if (set & TIOCM_DTR)
1156
mcr_value |= QT2_SERIAL_MCR_DTR;
1157
if (set & TIOCM_LOOP)
1158
mcr_value |= QT2_SERIAL_MCR_LOOP;
1160
status = qt2_box_set_register(port->serial, UartNumber,
1161
QT2_MODEM_CONTROL_REGISTER, mcr_value);
1168
/** qt2_break - Turn BREAK on and off on the UARTs
1170
static void qt2_break(struct tty_struct *tty, int break_state)
1172
struct usb_serial_port *port = tty->driver_data; /* parent port */
1173
struct usb_serial *serial = port->serial; /* parent device */
1174
struct quatech2_port *port_extra; /* extra data for this port */
1176
unsigned int result;
1178
port_extra = qt2_get_port_private(port);
1180
dbg("%s(): port %d: no serial object", __func__, port->number);
1184
if (break_state == -1)
1188
dbg("%s(): port %d, break_value %d", __func__, port->number,
1191
mutex_lock(&port_extra->modelock);
1192
if (!port_extra->open_count) {
1193
dbg("%s(): port not open", __func__);
1197
result = usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0),
1198
QT2_BREAK_CONTROL, 0x40, break_value,
1199
port->number, NULL, 0, 300);
1201
mutex_unlock(&port_extra->modelock);
1202
dbg("%s(): exit port %d", __func__, port->number);
1206
* qt2_throttle: - stop reading new data from the port
1208
static void qt2_throttle(struct tty_struct *tty)
1210
struct usb_serial_port *port = tty->driver_data;
1211
struct usb_serial *serial = port->serial;
1212
struct quatech2_port *port_extra; /* extra data for this port */
1213
dbg("%s(): port %d", __func__, port->number);
1215
port_extra = qt2_get_port_private(port);
1217
dbg("%s(): enter port %d no serial object", __func__,
1222
mutex_lock(&port_extra->modelock); /* lock structure */
1223
if (!port_extra->open_count) {
1224
dbg("%s(): port not open", __func__);
1227
/* Send command to box to stop receiving stuff. This will stop this
1228
* particular UART from filling the endpoint - in the multiport case the
1229
* FPGA UART will handle any flow control implemented, but for the single
1230
* port it's handed differently and we just quit submitting urbs
1232
if (serial->dev->descriptor.idProduct != QUATECH_SSU2_100)
1233
qt2_boxstoprx(serial, port->number, 1);
1235
port->throttled = 1;
1237
mutex_unlock(&port_extra->modelock);
1238
dbg("%s(): port %d: setting port->throttled", __func__, port->number);
1243
* qt2_unthrottle: - start receiving data through the port again after being
1246
static void qt2_unthrottle(struct tty_struct *tty)
1248
struct usb_serial_port *port = tty->driver_data;
1249
struct usb_serial *serial = port->serial;
1250
struct quatech2_port *port_extra; /* extra data for this port */
1251
struct usb_serial_port *port0; /* first port structure on device */
1252
struct quatech2_dev *dev_extra; /* extra data for the device */
1255
dbg("%s() enter port %d no serial object!", __func__,
1259
dbg("%s(): enter port %d", __func__, port->number);
1260
dev_extra = qt2_get_dev_private(serial);
1261
port_extra = qt2_get_port_private(port);
1262
port0 = serial->port[0]; /* get the first port's device structure */
1264
mutex_lock(&port_extra->modelock);
1265
if (!port_extra->open_count) {
1266
dbg("%s(): port %d not open", __func__, port->number);
1270
if (port->throttled != 0) {
1271
dbg("%s(): port %d: unsetting port->throttled", __func__,
1273
port->throttled = 0;
1274
/* Send command to box to start receiving stuff */
1275
if (serial->dev->descriptor.idProduct != QUATECH_SSU2_100) {
1276
qt2_boxstoprx(serial, port->number, 0);
1277
} else if (dev_extra->ReadBulkStopped == true) {
1278
usb_fill_bulk_urb(port0->read_urb, serial->dev,
1279
usb_rcvbulkpipe(serial->dev,
1280
port0->bulk_in_endpointAddress),
1281
port0->bulk_in_buffer,
1282
port0->bulk_in_size,
1283
qt2_read_bulk_callback,
1288
mutex_unlock(&port_extra->modelock);
1289
dbg("%s(): exit port %d", __func__, port->number);
1293
/* internal, private helper functions for the driver */
1295
/* Power up the FPGA in the box to get it working */
1296
static int qt2_boxpoweron(struct usb_serial *serial)
1301
Direcion = USBD_TRANSFER_DIRECTION_OUT;
1302
pipe = usb_rcvctrlpipe(serial->dev, 0);
1303
result = usb_control_msg(serial->dev, pipe, QT_SET_GET_DEVICE,
1304
Direcion, QU2BOXPWRON, 0x00, NULL, 0x00,
1310
* qt2_boxsetQMCR Issue a QT2_GET_SET_QMCR vendor-spcific request on the
1311
* default control pipe. If successful return the number of bytes written,
1312
* otherwise return a negative error number of the problem.
1314
static int qt2_boxsetQMCR(struct usb_serial *serial, __u16 Uart_Number,
1320
PortSettings = (__u16)(QMCR_Value);
1322
dbg("%s(): Port = %d, PortSettings = 0x%x", __func__,
1323
Uart_Number, PortSettings);
1325
result = usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0),
1326
QT2_GET_SET_QMCR, 0x40, PortSettings,
1327
(__u16)Uart_Number, NULL, 0, 5000);
1331
static int port_paranoia_check(struct usb_serial_port *port,
1332
const char *function)
1335
dbg("%s - port == NULL", function);
1338
if (!port->serial) {
1339
dbg("%s - port->serial == NULL\n", function);
1345
static int serial_paranoia_check(struct usb_serial *serial,
1346
const char *function)
1349
dbg("%s - serial == NULL\n", function);
1353
if (!serial->type) {
1354
dbg("%s - serial->type == NULL!", function);
1361
static inline struct quatech2_port *qt2_get_port_private(struct usb_serial_port
1364
return (struct quatech2_port *)usb_get_serial_port_data(port);
1367
static inline void qt2_set_port_private(struct usb_serial_port *port,
1368
struct quatech2_port *data)
1370
usb_set_serial_port_data(port, (void *)data);
1373
static inline struct quatech2_dev *qt2_get_dev_private(struct usb_serial
1376
return (struct quatech2_dev *)usb_get_serial_data(serial);
1378
static inline void qt2_set_dev_private(struct usb_serial *serial,
1379
struct quatech2_dev *data)
1381
usb_set_serial_data(serial, (void *)data);
1384
static int qt2_openboxchannel(struct usb_serial *serial, __u16
1385
Uart_Number, struct qt2_status_data *status)
1391
length = sizeof(struct qt2_status_data);
1392
Direcion = USBD_TRANSFER_DIRECTION_IN;
1393
pipe = usb_rcvctrlpipe(serial->dev, 0);
1394
result = usb_control_msg(serial->dev, pipe, QT_OPEN_CLOSE_CHANNEL,
1395
Direcion, 0x00, Uart_Number, status, length, 5000);
1398
static int qt2_closeboxchannel(struct usb_serial *serial, __u16 Uart_Number)
1403
direcion = USBD_TRANSFER_DIRECTION_OUT;
1404
pipe = usb_sndctrlpipe(serial->dev, 0);
1405
result = usb_control_msg(serial->dev, pipe, QT_OPEN_CLOSE_CHANNEL,
1406
direcion, 0, Uart_Number, NULL, 0, 5000);
1410
/* qt2_conf_uart Issue a SET_UART vendor-spcific request on the default
1411
* control pipe. If successful sets baud rate divisor and LCR value
1413
static int qt2_conf_uart(struct usb_serial *serial, unsigned short Uart_Number,
1414
unsigned short divisor, unsigned char LCR)
1417
unsigned short UartNumandLCR;
1419
UartNumandLCR = (LCR << 8) + Uart_Number;
1421
result = usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0),
1422
QT2_GET_SET_UART, 0x40, divisor, UartNumandLCR,
1427
/** @brief Callback for asynchronous submission of read URBs on bulk in
1430
* Registered in qt2_open_port(), used to deal with incomming data
1433
static void qt2_read_bulk_callback(struct urb *urb)
1435
/* Get the device pointer (struct usb_serial) back out of the URB */
1436
struct usb_serial *serial = urb->context;
1437
/* get the extra struct for the device */
1438
struct quatech2_dev *dev_extra = qt2_get_dev_private(serial);
1439
/* Get first port structure from the device */
1440
struct usb_serial_port *port0 = serial->port[0];
1441
/* Get the currently active port structure from serial struct */
1442
struct usb_serial_port *active = dev_extra->current_port;
1443
/* get the extra struct for port 0 */
1444
struct quatech2_port *port0_extra = qt2_get_port_private(port0);
1445
/* and for the currently active port */
1446
struct quatech2_port *active_extra = qt2_get_port_private(active);
1447
/* When we finally get to doing some tty stuff, we will need this */
1448
struct tty_struct *tty_st;
1449
unsigned int RxCount; /* the length of the data to process */
1450
unsigned int i; /* loop counter over the data to process */
1451
int result; /* return value cache variable */
1452
bool escapeflag; /* flag set to true if this loop iteration is
1453
* parsing an escape sequence, rather than
1455
dbg("%s(): callback running, active port is %d", __func__,
1459
/* read didn't go well */
1460
dev_extra->ReadBulkStopped = true;
1461
dbg("%s(): nonzero bulk read status received: %d",
1462
__func__, urb->status);
1466
/* inline port_sofrint() here */
1467
if (port_paranoia_check(port0, __func__) != 0) {
1468
dbg("%s - port_paranoia_check on port0 failed, exiting\n",
1472
if (port_paranoia_check(active, __func__) != 0) {
1473
dbg("%s - port_paranoia_check on current_port "
1474
"failed, exiting", __func__);
1478
/* This single callback function has to do for all the ports on
1479
* the device. Data being read up the USB can contain certain
1480
* escape sequences which are used to communicate out-of-band
1481
* information from the serial port in-band over the USB.
1482
* These escapes include sending modem and flow control line
1483
* status, and switching the port. The concept of a "Current Port"
1484
* is used, which is where data is going until a port change
1485
* escape seqence is received. This Current Port is kept between
1486
* callbacks so that when this function enters we know which the
1487
* currently active port is and can get to work right away without
1488
* the box having to send repeat escape sequences (anyway, how
1489
* would it know to do so?).
1492
if (active_extra->close_pending == true) {
1493
/* We are closing , stop reading */
1494
dbg("%s - (active->close_pending == true", __func__);
1495
if (dev_extra->open_ports <= 0) {
1496
/* If this is the only port left open - stop the
1498
dev_extra->ReadBulkStopped = true;
1499
dbg("%s - (ReadBulkStopped == true;", __func__);
1505
* RxHolding is asserted by throttle, if we assert it, we're not
1506
* receiving any more characters and let the box handle the flow
1509
if ((port0_extra->RxHolding == true) &&
1510
(serial->dev->descriptor.idProduct == QUATECH_SSU2_100)) {
1511
/* single port device, input is already stopped, so we don't
1512
* need any more input data */
1513
dev_extra->ReadBulkStopped = true;
1516
/* finally, we are in a situation where we might consider the data
1517
* that is contained within the URB, and what to do about it.
1518
* This is likely to involved communicating up to the TTY layer, so
1519
* we will need to get hold of the tty for the port we are currently
1522
/* active is a usb_serial_port. It has a member port which is a
1523
* tty_port. From this we get a tty_struct pointer which is what we
1524
* actually wanted, and keep it on tty_st */
1525
tty_st = tty_port_tty_get(&active->port);
1527
dbg("%s - bad tty pointer - exiting", __func__);
1530
RxCount = urb->actual_length; /* grab length of data handy */
1533
/* skip all this if no data to process */
1534
for (i = 0; i < RxCount ; ++i) {
1535
/* Look ahead code here -works on several bytes at onc*/
1536
if ((i <= (RxCount - 3)) && (THISCHAR == 0x1b)
1537
&& (NEXTCHAR == 0x1b)) {
1538
/* we are in an escape sequence, type
1539
* determined by the 3rd char */
1541
switch (THIRDCHAR) {
1543
/* Line status change 4th byte must
1545
if (i > (RxCount - 4)) {
1546
dbg("Illegal escape sequences "
1547
"in received data");
1550
qt2_process_line_status(active,
1556
/* Modem status status change 4th byte
1558
if (i > (RxCount - 4)) {
1559
dbg("Illegal escape sequences "
1560
"in received data");
1563
qt2_process_modem_status(active,
1569
/* xmit hold empty 4th byte
1571
if (i > (RxCount - 4)) {
1572
dbg("Illegal escape sequences "
1573
"in received data");
1576
qt2_process_xmit_empty(active,
1577
FOURTHCHAR, FIFTHCHAR);
1582
/* Port number change 4th byte
1584
if (i > (RxCount - 4)) {
1585
dbg("Illegal escape sequences "
1586
"in received data");
1589
/* Port change. If port open push
1590
* current data up to tty layer */
1591
if (active_extra->open_count > 0)
1592
tty_flip_buffer_push(tty_st);
1594
dbg("Port Change: new port = %d",
1596
qt2_process_port_change(active,
1600
/* having changed port, the pointers for
1601
* the currently active port are all out
1602
* of date and need updating */
1603
active = dev_extra->current_port;
1605
qt2_get_port_private(active);
1606
tty_st = tty_port_tty_get(
1610
/* Recv flush 3rd byte must
1612
if (i > (RxCount - 3)) {
1613
dbg("Illegal escape sequences "
1614
"in received data");
1617
qt2_process_rcv_flush(active);
1622
/* xmit flush 3rd byte must follow */
1623
if (i > (RxCount - 3)) {
1624
dbg("Illegal escape sequences "
1625
"in received data");
1628
qt2_process_xmit_flush(active);
1633
dbg("No status sequence");
1634
qt2_process_rx_char(active, THISCHAR);
1635
qt2_process_rx_char(active, NEXTCHAR);
1639
qt2_process_rx_char(active, THISCHAR);
1643
if (escapeflag == true)
1645
/* if we did an escape char, we don't need
1646
* to mess around pushing data through the
1647
* tty layer, and can go round again */
1649
if (tty_st && urb->actual_length) {
1650
tty_buffer_request_room(tty_st, 1);
1651
tty_insert_flip_string(tty_st, &(
1653
(urb->transfer_buffer)
1657
tty_flip_buffer_push(tty_st);
1660
/* at this point we have complete dealing with the data for this
1661
* callback. All we have to do now is to start the async read process
1662
* back off again. */
1664
usb_fill_bulk_urb(port0->read_urb, serial->dev,
1665
usb_rcvbulkpipe(serial->dev, port0->bulk_in_endpointAddress),
1666
port0->bulk_in_buffer, port0->bulk_in_size,
1667
qt2_read_bulk_callback, serial);
1668
result = usb_submit_urb(port0->read_urb, GFP_ATOMIC);
1670
dbg("%s(): failed resubmitting read urb, error %d",
1673
dbg("%s() successfully resubmitted read urb", __func__);
1674
if (tty_st && RxCount) {
1675
/* if some inbound data was processed, then
1676
* we need to push that through the tty layer
1678
tty_flip_buffer_push(tty_st);
1679
tty_schedule_flip(tty_st);
1683
/* cribbed from serqt_usb2 driver, but not sure which work needs
1684
* scheduling - port0 or currently active port? */
1685
/* schedule_work(&port->work); */
1686
dbg("%s() completed", __func__);
1690
/** @brief Callback for asynchronous submission of write URBs on bulk in
1693
* Registered in qt2_write(), used to deal with outgoing data
1696
static void qt2_write_bulk_callback(struct urb *urb)
1698
struct usb_serial_port *port = (struct usb_serial_port *)urb->context;
1699
struct usb_serial *serial = port->serial;
1700
dbg("%s(): port %d", __func__, port->number);
1702
dbg("%s(): bad serial pointer, exiting", __func__);
1706
dbg("%s(): nonzero write bulk status received: %d",
1707
__func__, urb->status);
1710
/* FIXME What is supposed to be going on here?
1711
* does this actually do anything useful, and should it?
1713
/*port_softint((void *) serial); commented in vendor driver */
1714
schedule_work(&port->work);
1715
dbg("%s(): port %d exit", __func__, port->number);
1719
static void qt2_process_line_status(struct usb_serial_port *port,
1720
unsigned char LineStatus)
1722
/* obtain the private structure for the port */
1723
struct quatech2_port *port_extra = qt2_get_port_private(port);
1724
port_extra->shadowLSR = LineStatus & (QT2_SERIAL_LSR_OE |
1725
QT2_SERIAL_LSR_PE | QT2_SERIAL_LSR_FE | QT2_SERIAL_LSR_BI);
1727
static void qt2_process_modem_status(struct usb_serial_port *port,
1728
unsigned char ModemStatus)
1730
/* obtain the private structure for the port */
1731
struct quatech2_port *port_extra = qt2_get_port_private(port);
1732
port_extra->shadowMSR = ModemStatus;
1733
wake_up_interruptible(&port_extra->wait);
1734
/* this wakes up the otherwise indefinitely waiting code for
1735
* the TIOCMIWAIT ioctl, so that it can notice that
1736
* port_extra->shadowMSR has changed and the ioctl needs to return.
1740
static void qt2_process_xmit_empty(struct usb_serial_port *port,
1741
unsigned char fourth_char, unsigned char fifth_char)
1744
/* obtain the private structure for the port */
1745
struct quatech2_port *port_extra = qt2_get_port_private(port);
1747
byte_count = (int)(fifth_char * 16);
1748
byte_count += (int)fourth_char;
1749
/* byte_count indicates how many bytes the device has written out. This
1750
* message appears to occur regularly, and is used in the vendor driver
1751
* to keep track of the fill state of the port transmit buffer */
1752
port_extra->tx_pending_bytes -= byte_count;
1753
/* reduce the stored data queue length by the known number of bytes
1755
dbg("port %d: %d bytes reported sent, %d still pending", port->number,
1756
byte_count, port_extra->tx_pending_bytes);
1758
/*port_extra->xmit_fifo_room_bytes = FIFO_DEPTH; ???*/
1761
static void qt2_process_port_change(struct usb_serial_port *port,
1762
unsigned char New_Current_Port)
1764
/* obtain the parent usb serial device structure */
1765
struct usb_serial *serial = port->serial;
1766
/* obtain the private structure for the device */
1767
struct quatech2_dev *dev_extra = qt2_get_dev_private(serial);
1768
dev_extra->current_port = serial->port[New_Current_Port];
1769
/* what should I do with this? commented out in upstream
1771
/*schedule_work(&port->work);*/
1774
static void qt2_process_rcv_flush(struct usb_serial_port *port)
1776
/* obtain the private structure for the port */
1777
struct quatech2_port *port_extra = qt2_get_port_private(port);
1778
port_extra->rcv_flush = true;
1780
static void qt2_process_xmit_flush(struct usb_serial_port *port)
1782
/* obtain the private structure for the port */
1783
struct quatech2_port *port_extra = qt2_get_port_private(port);
1784
port_extra->xmit_flush = true;
1787
static void qt2_process_rx_char(struct usb_serial_port *port,
1790
/* get the tty_struct for this port */
1791
struct tty_struct *tty = tty_port_tty_get(&(port->port));
1792
/* get the URB with the data in to push */
1793
struct urb *urb = port->serial->port[0]->read_urb;
1795
if (tty && urb->actual_length) {
1796
tty_buffer_request_room(tty, 1);
1797
tty_insert_flip_string(tty, &data, 1);
1798
/* should this be commented out here? */
1799
/*tty_flip_buffer_push(tty);*/
1803
/** @brief Retrieve the value of a register from the device
1805
* Issues a GET_REGISTER vendor-spcific request over the USB control
1806
* pipe to obtain a value back from a specific register on a specific
1808
* @param serial Serial device handle to access the device through
1809
* @param uart_number Which UART the value is wanted from
1810
* @param register_num Which register to read the value from
1811
* @param pValue Pointer to somewhere to put the retrieved value
1813
static int qt2_box_get_register(struct usb_serial *serial,
1814
unsigned char uart_number, unsigned short register_num,
1818
result = usb_control_msg(serial->dev, usb_rcvctrlpipe(serial->dev, 0),
1819
QT2_GET_SET_REGISTER, 0xC0, register_num,
1820
uart_number, (void *)pValue, sizeof(*pValue), 300);
1824
/** qt2_box_set_register
1825
* Issue a SET_REGISTER vendor-specific request on the default control pipe
1827
static int qt2_box_set_register(struct usb_serial *serial,
1828
unsigned short Uart_Number, unsigned short Register_Num,
1829
unsigned short Value)
1832
unsigned short reg_and_byte;
1834
reg_and_byte = Value;
1835
reg_and_byte = reg_and_byte << 8;
1836
reg_and_byte = reg_and_byte + Register_Num;
1838
result = usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0),
1839
QT2_GET_SET_REGISTER, 0x40, reg_and_byte,
1840
Uart_Number, NULL, 0, 300);
1844
/** qt2_boxsetuart - Issue a SET_UART vendor-spcific request on the default
1845
* control pipe. If successful sets baud rate divisor and LCR value.
1847
static int qt2_boxsetuart(struct usb_serial *serial, unsigned short Uart_Number,
1848
unsigned short default_divisor, unsigned char default_LCR)
1850
unsigned short UartNumandLCR;
1852
UartNumandLCR = (default_LCR << 8) + Uart_Number;
1854
return usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0),
1855
QT2_GET_SET_UART, 0x40, default_divisor, UartNumandLCR,
1859
/** qt2_boxsethw_flowctl - Turn hardware (RTS/CTS) flow control on and off for
1862
static int qt2_boxsethw_flowctl(struct usb_serial *serial,
1863
unsigned int UartNumber, bool bSet)
1867
__u16 MOUT_Value = 0;
1870
MCR_Value = QT2_SERIAL_MCR_RTS;
1871
/* flow control, box will clear RTS line to prevent remote
1872
* device from transmitting more chars */
1874
/* no flow control to remote device */
1877
MOUT_Value = MCR_Value << 8;
1880
MSR_Value = QT2_SERIAL_MSR_CTS;
1881
/* flow control on, box will inhibit tx data if CTS line is
1884
/* Box will not inhibit tx data due to CTS line */
1887
MOUT_Value |= MSR_Value;
1888
return usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0),
1889
QT2_HW_FLOW_CONTROL_MASK, 0x40, MOUT_Value, UartNumber,
1893
/** qt2_boxsetsw_flowctl - Turn software (XON/XOFF) flow control on for
1894
* a hardware UART, and set the XON and XOFF characters.
1896
static int qt2_boxsetsw_flowctl(struct usb_serial *serial, __u16 UartNumber,
1897
unsigned char stop_char, unsigned char start_char)
1901
nSWflowout = start_char << 8;
1902
nSWflowout = (unsigned short)stop_char;
1903
return usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0),
1904
QT2_SW_FLOW_CONTROL_MASK, 0x40, nSWflowout, UartNumber,
1908
/** qt2_boxunsetsw_flowctl - Turn software (XON/XOFF) flow control off for
1911
static int qt2_boxunsetsw_flowctl(struct usb_serial *serial, __u16 UartNumber)
1913
return usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0),
1914
QT2_SW_FLOW_CONTROL_DISABLE, 0x40, 0, UartNumber, NULL,
1919
* qt2_boxstoprx - Start and stop reception of data by the FPGA UART in
1920
* response to requests from the tty layer
1921
* @serial: pointer to the usb_serial structure for the parent device
1922
* @uart_number: which UART on the device we are addressing
1923
* @stop: Whether to start or stop data reception. Set to 1 to stop data being
1924
* received, and to 0 to start it being received.
1926
static int qt2_boxstoprx(struct usb_serial *serial, unsigned short uart_number,
1927
unsigned short stop)
1929
return usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0),
1930
QT2_STOP_RECEIVE, 0x40, stop, uart_number, NULL, 0, 300);
1935
* last things in file: stuff to register this driver into the generic
1936
* USB serial framework.
1939
static struct usb_serial_driver quatech2_device = {
1941
.owner = THIS_MODULE,
1942
.name = "quatech_usb2",
1944
.description = DRIVER_DESC,
1945
.usb_driver = &quausb2_usb_driver,
1946
.id_table = quausb2_id_table,
1951
.write_room = qt2_write_room,
1952
.chars_in_buffer = qt2_chars_in_buffer,
1953
.throttle = qt2_throttle,
1954
.unthrottle = qt2_unthrottle,
1955
.calc_num_ports = qt2_calc_num_ports,
1957
.set_termios = qt2_set_termios,
1958
.break_ctl = qt2_break,
1959
.tiocmget = qt2_tiocmget,
1960
.tiocmset = qt2_tiocmset,
1961
.attach = qt2_attach,
1962
.release = qt2_release,
1963
.read_bulk_callback = qt2_read_bulk_callback,
1964
.write_bulk_callback = qt2_write_bulk_callback,
1967
static int __init quausb2_usb_init(void)
1971
dbg("%s\n", __func__);
1973
/* register with usb-serial */
1974
retval = usb_serial_register(&quatech2_device);
1977
goto failed_usb_serial_register;
1979
printk(KERN_INFO KBUILD_MODNAME ": " DRIVER_VERSION ":"
1982
/* register with usb */
1984
retval = usb_register(&quausb2_usb_driver);
1988
/* if we're here, usb_register() failed */
1989
usb_serial_deregister(&quatech2_device);
1990
failed_usb_serial_register:
1994
static void __exit quausb2_usb_exit(void)
1996
usb_deregister(&quausb2_usb_driver);
1997
usb_serial_deregister(&quatech2_device);
2000
module_init(quausb2_usb_init);
2001
module_exit(quausb2_usb_exit);
2003
MODULE_AUTHOR(DRIVER_AUTHOR);
2004
MODULE_DESCRIPTION(DRIVER_DESC);
2005
MODULE_LICENSE("GPL");
2007
module_param(debug, bool, S_IRUGO | S_IWUSR);
2008
MODULE_PARM_DESC(debug, "Debug enabled or not");