3 * Controls the Moschip 7720 usb to dual port serial convertor
5 * Copyright 2006 Moschip Semiconductor Tech. Ltd.
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License as published by
9 * the Free Software Foundation, version 2 of the License.
12 * Vijaya Kumar <vijaykumar.gn@gmail.com>
13 * Ajay Kumar <naanuajay@yahoo.com>
14 * Gurudeva <ngurudeva@yahoo.com>
16 * Cleaned up from the original by:
17 * Greg Kroah-Hartman <gregkh@suse.de>
19 * Originally based on drivers/usb/serial/io_edgeport.c which is:
20 * Copyright (C) 2000 Inside Out Networks, All rights reserved.
21 * Copyright (C) 2001-2002 Greg Kroah-Hartman <greg@kroah.com>
23 #include <linux/kernel.h>
24 #include <linux/errno.h>
25 #include <linux/init.h>
26 #include <linux/slab.h>
27 #include <linux/tty.h>
28 #include <linux/tty_driver.h>
29 #include <linux/tty_flip.h>
30 #include <linux/module.h>
31 #include <linux/spinlock.h>
32 #include <linux/serial.h>
33 #include <linux/serial_reg.h>
34 #include <linux/usb.h>
35 #include <linux/usb/serial.h>
36 #include <asm/uaccess.h>
42 #define DRIVER_VERSION "1.0.0.4F"
43 #define DRIVER_AUTHOR "Aspire Communications pvt Ltd."
44 #define DRIVER_DESC "Moschip USB Serial Driver"
46 /* default urb timeout */
47 #define MOS_WDR_TIMEOUT (HZ * 5)
49 #define MOS_PORT1 0x0200
50 #define MOS_PORT2 0x0300
51 #define MOS_VENREG 0x0000
52 #define MOS_MAX_PORT 0x02
53 #define MOS_WRITE 0x0E
56 /* Interrupt Rotinue Defines */
57 #define SERIAL_IIR_RLS 0x06
58 #define SERIAL_IIR_RDA 0x04
59 #define SERIAL_IIR_CTI 0x0c
60 #define SERIAL_IIR_THR 0x02
61 #define SERIAL_IIR_MS 0x00
63 #define NUM_URBS 16 /* URB Count */
64 #define URB_TRANSFER_BUFFER_SIZE 32 /* URB Size */
66 /* This structure holds all of the local port information */
69 __u8 shadowLCR; /* last LCR value received */
70 __u8 shadowMCR; /* last MCR value received */
71 __u8 shadowMSR; /* last MSR value received */
73 struct async_icount icount;
74 struct usb_serial_port *port; /* loop back to the owner */
75 struct urb *write_urb_pool[NUM_URBS];
78 /* This structure holds all of the individual serial device information */
81 int interrupt_started;
86 #define USB_VENDOR_ID_MOSCHIP 0x9710
87 #define MOSCHIP_DEVICE_ID_7720 0x7720
88 #define MOSCHIP_DEVICE_ID_7715 0x7715
90 static struct usb_device_id moschip_port_id_table [] = {
91 { USB_DEVICE(USB_VENDOR_ID_MOSCHIP,MOSCHIP_DEVICE_ID_7720) },
92 { } /* terminating entry */
94 MODULE_DEVICE_TABLE(usb, moschip_port_id_table);
98 * mos7720_interrupt_callback
99 * this is the callback function for when we have received data on the
100 * interrupt endpoint.
102 static void mos7720_interrupt_callback(struct urb *urb)
106 int status = urb->status;
111 dbg("%s"," : Entering\n");
120 /* this urb is terminated, clean up */
121 dbg("%s - urb shutting down with status: %d", __FUNCTION__,
125 dbg("%s - nonzero urb status received: %d", __FUNCTION__,
130 length = urb->actual_length;
131 data = urb->transfer_buffer;
133 /* Moschip get 4 bytes
134 * Byte 1 IIR Port 1 (port.number is 0)
135 * Byte 2 IIR Port 2 (port.number is 1)
136 * Byte 3 --------------
137 * Byte 4 FIFO status for both */
139 /* the above description is inverted
140 * oneukum 2007-03-14 */
142 if (unlikely(length != 4)) {
143 dbg("Wrong data !!!");
150 if ((sp1 | sp2) & 0x01) {
151 /* No Interrupt Pending in both the ports */
152 dbg("No Interrupt !!!");
154 switch (sp1 & 0x0f) {
156 dbg("Serial Port 1: Receiver status error or address "
157 "bit detected in 9-bit mode\n");
160 dbg("Serial Port 1: Receiver time out");
163 dbg("Serial Port 1: Modem status change");
167 switch (sp2 & 0x0f) {
169 dbg("Serial Port 2: Receiver status error or address "
170 "bit detected in 9-bit mode");
173 dbg("Serial Port 2: Receiver time out");
176 dbg("Serial Port 2: Modem status change");
182 result = usb_submit_urb(urb, GFP_ATOMIC);
184 dev_err(&urb->dev->dev,
185 "%s - Error %d submitting control urb\n",
186 __FUNCTION__, result);
191 * mos7720_bulk_in_callback
192 * this is the callback function for when we have received data on the
195 static void mos7720_bulk_in_callback(struct urb *urb)
198 unsigned char *data ;
199 struct usb_serial_port *port;
200 struct moschip_port *mos7720_port;
201 struct tty_struct *tty;
202 int status = urb->status;
205 dbg("nonzero read bulk status received: %d", status);
209 mos7720_port = urb->context;
211 dbg("%s","NULL mos7720_port pointer \n");
215 port = mos7720_port->port;
217 dbg("Entering...%s", __FUNCTION__);
219 data = urb->transfer_buffer;
222 if (tty && urb->actual_length) {
223 tty_buffer_request_room(tty, urb->actual_length);
224 tty_insert_flip_string(tty, data, urb->actual_length);
225 tty_flip_buffer_push(tty);
228 if (!port->read_urb) {
229 dbg("URB KILLED !!!");
233 if (port->read_urb->status != -EINPROGRESS) {
234 port->read_urb->dev = port->serial->dev;
236 retval = usb_submit_urb(port->read_urb, GFP_ATOMIC);
238 dbg("usb_submit_urb(read bulk) failed, retval = %d",
244 * mos7720_bulk_out_data_callback
245 * this is the callback function for when we have finished sending serial
246 * data on the bulk out endpoint.
248 static void mos7720_bulk_out_data_callback(struct urb *urb)
250 struct moschip_port *mos7720_port;
251 struct tty_struct *tty;
252 int status = urb->status;
255 dbg("nonzero write bulk status received:%d", status);
259 mos7720_port = urb->context;
261 dbg("NULL mos7720_port pointer");
265 dbg("Entering .........");
267 tty = mos7720_port->port->tty;
269 if (tty && mos7720_port->open)
275 * this function will be used for sending command to device
277 static int send_mos_cmd(struct usb_serial *serial, __u8 request, __u16 value,
278 __u16 index, void *data)
282 u16 product = le16_to_cpu(serial->dev->descriptor.idProduct);
286 if (value < MOS_MAX_PORT) {
287 if (product == MOSCHIP_DEVICE_ID_7715) {
288 value = value*0x100+0x100;
290 value = value*0x100+0x200;
294 if ((product == MOSCHIP_DEVICE_ID_7715) &&
296 dbg("serial->product== MOSCHIP_DEVICE_ID_7715");
301 if (request == MOS_WRITE) {
302 request = (__u8)MOS_WRITE;
303 requesttype = (__u8)0x40;
304 value = value + (__u16)*((unsigned char *)data);
306 pipe = usb_sndctrlpipe(serial->dev, 0);
308 request = (__u8)MOS_READ;
309 requesttype = (__u8)0xC0;
311 pipe = usb_rcvctrlpipe(serial->dev,0);
314 status = usb_control_msg(serial->dev, pipe, request, requesttype,
315 value, index, data, size, MOS_WDR_TIMEOUT);
318 dbg("Command Write failed Value %x index %x\n",value,index);
323 static int mos7720_open(struct usb_serial_port *port, struct file * filp)
325 struct usb_serial *serial;
326 struct usb_serial_port *port0;
328 struct moschip_serial *mos7720_serial;
329 struct moschip_port *mos7720_port;
333 int allocated_urbs = 0;
336 serial = port->serial;
338 mos7720_port = usb_get_serial_port_data(port);
339 if (mos7720_port == NULL)
342 port0 = serial->port[0];
344 mos7720_serial = usb_get_serial_data(serial);
346 if (mos7720_serial == NULL || port0 == NULL)
349 usb_clear_halt(serial->dev, port->write_urb->pipe);
350 usb_clear_halt(serial->dev, port->read_urb->pipe);
352 /* Initialising the write urb pool */
353 for (j = 0; j < NUM_URBS; ++j) {
354 urb = usb_alloc_urb(0,GFP_KERNEL);
355 mos7720_port->write_urb_pool[j] = urb;
358 err("No more urbs???");
362 urb->transfer_buffer = kmalloc(URB_TRANSFER_BUFFER_SIZE,
364 if (!urb->transfer_buffer) {
365 err("%s-out of memory for urb buffers.", __FUNCTION__);
366 usb_free_urb(mos7720_port->write_urb_pool[j]);
367 mos7720_port->write_urb_pool[j] = NULL;
376 /* Initialize MCS7720 -- Write Init values to corresponding Registers
384 * 0x08 : SP1/2 Control Reg
386 port_number = port->number - port->serial->minor;
387 send_mos_cmd(port->serial, MOS_READ, port_number, UART_LSR, &data);
388 dbg("SS::%p LSR:%x\n",mos7720_port, data);
390 dbg("Check:Sending Command ..........");
393 send_mos_cmd(serial, MOS_WRITE, MOS_MAX_PORT, 0x01, &data);
395 send_mos_cmd(serial, MOS_WRITE, MOS_MAX_PORT, 0x02, &data);
398 send_mos_cmd(serial, MOS_WRITE, port_number, 0x01, &data);
400 send_mos_cmd(serial, MOS_WRITE, port_number, 0x02, &data);
403 send_mos_cmd(serial, MOS_WRITE, port_number, 0x02, &data);
405 mos7720_port->shadowLCR = data;
406 send_mos_cmd(serial, MOS_WRITE, port_number, 0x03, &data);
408 mos7720_port->shadowMCR = data;
409 send_mos_cmd(serial, MOS_WRITE, port_number, 0x04, &data);
411 send_mos_cmd(serial, MOS_WRITE, port_number, 0x04, &data);
414 send_mos_cmd(serial, MOS_READ, MOS_MAX_PORT, 0x08, &data);
416 send_mos_cmd(serial, MOS_WRITE, MOS_MAX_PORT, 0x08, &data);
419 send_mos_cmd(serial, MOS_READ, MOS_MAX_PORT, port_number + 1, &data);
421 send_mos_cmd(serial, MOS_WRITE, MOS_MAX_PORT, port_number + 1, &data);
423 send_mos_cmd(port->serial, MOS_WRITE, MOS_MAX_PORT, port_number + 1, &data);
426 send_mos_cmd(serial, MOS_READ, MOS_MAX_PORT, 0x08, &data);
428 data = data | (port->number - port->serial->minor + 1);
429 send_mos_cmd(serial, MOS_WRITE, MOS_MAX_PORT, 0x08, &data);
432 mos7720_port->shadowLCR = data;
433 send_mos_cmd(serial, MOS_WRITE, port_number, 0x03, &data);
435 send_mos_cmd(serial, MOS_WRITE, port_number, 0x00, &data);
437 send_mos_cmd(serial, MOS_WRITE, port_number, 0x01, &data);
439 mos7720_port->shadowLCR = data;
440 send_mos_cmd(serial, MOS_WRITE, port_number, 0x03, &data);
442 send_mos_cmd(serial, MOS_WRITE, port_number, 0x01, &data);
444 send_mos_cmd(serial, MOS_WRITE, port_number, 0x01, &data);
448 /* force low_latency on so that our tty_push actually forces *
449 * the data through,otherwise it is scheduled, and with *
450 * high data rates (like with OHCI) data can get lost. */
453 port->tty->low_latency = 1;
455 /* see if we've set up our endpoint info yet *
456 * (can't set it up in mos7720_startup as the *
457 * structures were not set up at that time.) */
458 if (!mos7720_serial->interrupt_started) {
459 dbg("Interrupt buffer NULL !!!");
461 /* not set up yet, so do it now */
462 mos7720_serial->interrupt_started = 1;
464 dbg("To Submit URB !!!");
466 /* set up our interrupt urb */
467 usb_fill_int_urb(port0->interrupt_in_urb, serial->dev,
468 usb_rcvintpipe(serial->dev,
469 port->interrupt_in_endpointAddress),
470 port0->interrupt_in_buffer,
471 port0->interrupt_in_urb->transfer_buffer_length,
472 mos7720_interrupt_callback, mos7720_port,
473 port0->interrupt_in_urb->interval);
475 /* start interrupt read for this mos7720 this interrupt *
476 * will continue as long as the mos7720 is connected */
477 dbg("Submit URB over !!!");
478 response = usb_submit_urb(port0->interrupt_in_urb, GFP_KERNEL);
481 "%s - Error %d submitting control urb\n",
482 __FUNCTION__, response);
485 /* set up our bulk in urb */
486 usb_fill_bulk_urb(port->read_urb, serial->dev,
487 usb_rcvbulkpipe(serial->dev,
488 port->bulk_in_endpointAddress),
489 port->bulk_in_buffer,
490 port->read_urb->transfer_buffer_length,
491 mos7720_bulk_in_callback, mos7720_port);
492 response = usb_submit_urb(port->read_urb, GFP_KERNEL);
495 "%s - Error %d submitting read urb\n", __FUNCTION__, response);
497 /* initialize our icount structure */
498 memset(&(mos7720_port->icount), 0x00, sizeof(mos7720_port->icount));
500 /* initialize our port settings */
501 mos7720_port->shadowMCR = UART_MCR_OUT2; /* Must set to enable ints! */
503 /* send a open port command */
504 mos7720_port->open = 1;
510 * mos7720_chars_in_buffer
511 * this function is called by the tty driver when it wants to know how many
512 * bytes of data we currently have outstanding in the port (data that has
513 * been written, but hasn't made it out the port yet)
514 * If successful, we return the number of bytes left to be written in the
516 * Otherwise we return a negative error number.
518 static int mos7720_chars_in_buffer(struct usb_serial_port *port)
522 struct moschip_port *mos7720_port;
524 dbg("%s:entering ...........", __FUNCTION__);
526 mos7720_port = usb_get_serial_port_data(port);
527 if (mos7720_port == NULL) {
528 dbg("%s:leaving ...........", __FUNCTION__);
532 for (i = 0; i < NUM_URBS; ++i) {
533 if (mos7720_port->write_urb_pool[i] && mos7720_port->write_urb_pool[i]->status == -EINPROGRESS)
534 chars += URB_TRANSFER_BUFFER_SIZE;
536 dbg("%s - returns %d", __FUNCTION__, chars);
540 static void mos7720_close(struct usb_serial_port *port, struct file *filp)
542 struct usb_serial *serial;
543 struct moschip_port *mos7720_port;
547 dbg("mos7720_close:entering...");
549 serial = port->serial;
551 mos7720_port = usb_get_serial_port_data(port);
552 if (mos7720_port == NULL)
555 for (j = 0; j < NUM_URBS; ++j)
556 usb_kill_urb(mos7720_port->write_urb_pool[j]);
558 /* Freeing Write URBs */
559 for (j = 0; j < NUM_URBS; ++j) {
560 if (mos7720_port->write_urb_pool[j]) {
561 kfree(mos7720_port->write_urb_pool[j]->transfer_buffer);
562 usb_free_urb(mos7720_port->write_urb_pool[j]);
566 /* While closing port, shutdown all bulk read, write *
567 * and interrupt read if they exists */
569 dbg("Shutdown bulk write");
570 usb_kill_urb(port->write_urb);
571 dbg("Shutdown bulk read");
572 usb_kill_urb(port->read_urb);
576 send_mos_cmd(serial, MOS_WRITE, port->number - port->serial->minor,
580 send_mos_cmd(serial, MOS_WRITE, port->number - port->serial->minor,
583 mos7720_port->open = 0;
585 dbg("Leaving %s", __FUNCTION__);
588 static void mos7720_break(struct usb_serial_port *port, int break_state)
591 struct usb_serial *serial;
592 struct moschip_port *mos7720_port;
594 dbg("Entering %s", __FUNCTION__);
596 serial = port->serial;
598 mos7720_port = usb_get_serial_port_data(port);
599 if (mos7720_port == NULL)
602 if (break_state == -1)
603 data = mos7720_port->shadowLCR | UART_LCR_SBC;
605 data = mos7720_port->shadowLCR & ~UART_LCR_SBC;
607 mos7720_port->shadowLCR = data;
608 send_mos_cmd(serial, MOS_WRITE, port->number - port->serial->minor,
616 * this function is called by the tty driver when it wants to know how many
617 * bytes of data we can accept for a specific port.
618 * If successful, we return the amount of room that we have for this port
619 * Otherwise we return a negative error number.
621 static int mos7720_write_room(struct usb_serial_port *port)
623 struct moschip_port *mos7720_port;
627 dbg("%s:entering ...........", __FUNCTION__);
629 mos7720_port = usb_get_serial_port_data(port);
630 if (mos7720_port == NULL) {
631 dbg("%s:leaving ...........", __FUNCTION__);
635 for (i = 0; i < NUM_URBS; ++i) {
636 if (mos7720_port->write_urb_pool[i] && mos7720_port->write_urb_pool[i]->status != -EINPROGRESS)
637 room += URB_TRANSFER_BUFFER_SIZE;
640 dbg("%s - returns %d", __FUNCTION__, room);
644 static int mos7720_write(struct usb_serial_port *port,
645 const unsigned char *data, int count)
652 struct moschip_port *mos7720_port;
653 struct usb_serial *serial;
655 const unsigned char *current_position = data;
657 dbg("%s:entering ...........", __FUNCTION__);
659 serial = port->serial;
661 mos7720_port = usb_get_serial_port_data(port);
662 if (mos7720_port == NULL) {
663 dbg("mos7720_port is NULL");
667 /* try to find a free urb in the list */
670 for (i = 0; i < NUM_URBS; ++i) {
671 if (mos7720_port->write_urb_pool[i] && mos7720_port->write_urb_pool[i]->status != -EINPROGRESS) {
672 urb = mos7720_port->write_urb_pool[i];
679 dbg("%s - no more free urbs", __FUNCTION__);
683 if (urb->transfer_buffer == NULL) {
684 urb->transfer_buffer = kmalloc(URB_TRANSFER_BUFFER_SIZE,
686 if (urb->transfer_buffer == NULL) {
687 err("%s no more kernel memory...", __FUNCTION__);
691 transfer_size = min (count, URB_TRANSFER_BUFFER_SIZE);
693 memcpy(urb->transfer_buffer, current_position, transfer_size);
694 usb_serial_debug_data(debug, &port->dev, __FUNCTION__, transfer_size,
695 urb->transfer_buffer);
697 /* fill urb with data and submit */
698 usb_fill_bulk_urb(urb, serial->dev,
699 usb_sndbulkpipe(serial->dev,
700 port->bulk_out_endpointAddress),
701 urb->transfer_buffer, transfer_size,
702 mos7720_bulk_out_data_callback, mos7720_port);
704 /* send it down the pipe */
705 status = usb_submit_urb(urb,GFP_ATOMIC);
707 err("%s - usb_submit_urb(write bulk) failed with status = %d",
708 __FUNCTION__, status);
712 bytes_sent = transfer_size;
718 static void mos7720_throttle(struct usb_serial_port *port)
720 struct moschip_port *mos7720_port;
721 struct tty_struct *tty;
724 dbg("%s- port %d\n", __FUNCTION__, port->number);
726 mos7720_port = usb_get_serial_port_data(port);
728 if (mos7720_port == NULL)
731 if (!mos7720_port->open) {
732 dbg("port not opened");
736 dbg("%s: Entering ..........", __FUNCTION__);
740 dbg("%s - no tty available", __FUNCTION__);
744 /* if we are implementing XON/XOFF, send the stop character */
746 unsigned char stop_char = STOP_CHAR(tty);
747 status = mos7720_write(port, &stop_char, 1);
752 /* if we are implementing RTS/CTS, toggle that line */
753 if (tty->termios->c_cflag & CRTSCTS) {
754 mos7720_port->shadowMCR &= ~UART_MCR_RTS;
755 status = send_mos_cmd(port->serial, MOS_WRITE,
756 port->number - port->serial->minor,
757 UART_MCR, &mos7720_port->shadowMCR);
763 static void mos7720_unthrottle(struct usb_serial_port *port)
765 struct tty_struct *tty;
767 struct moschip_port *mos7720_port = usb_get_serial_port_data(port);
769 if (mos7720_port == NULL)
772 if (!mos7720_port->open) {
773 dbg("%s - port not opened", __FUNCTION__);
777 dbg("%s: Entering ..........", __FUNCTION__);
781 dbg("%s - no tty available", __FUNCTION__);
785 /* if we are implementing XON/XOFF, send the start character */
787 unsigned char start_char = START_CHAR(tty);
788 status = mos7720_write(port, &start_char, 1);
793 /* if we are implementing RTS/CTS, toggle that line */
794 if (tty->termios->c_cflag & CRTSCTS) {
795 mos7720_port->shadowMCR |= UART_MCR_RTS;
796 status = send_mos_cmd(port->serial, MOS_WRITE,
797 port->number - port->serial->minor,
798 UART_MCR, &mos7720_port->shadowMCR);
804 static int set_higher_rates(struct moschip_port *mos7720_port,
808 struct usb_serial_port *port;
809 struct usb_serial *serial;
812 if (mos7720_port == NULL)
815 port = mos7720_port->port;
816 serial = port->serial;
818 /***********************************************
819 * Init Sequence for higher rates
820 ***********************************************/
821 dbg("Sending Setting Commands ..........");
822 port_number = port->number - port->serial->minor;
825 send_mos_cmd(serial, MOS_WRITE, port_number, 0x01, &data);
827 send_mos_cmd(serial, MOS_WRITE, port_number, 0x02, &data);
829 send_mos_cmd(serial, MOS_WRITE, port->number, 0x02, &data);
831 mos7720_port->shadowMCR = data;
832 send_mos_cmd(serial, MOS_WRITE, port_number, 0x04, &data);
834 send_mos_cmd(serial, MOS_WRITE, port_number, 0x04, &data);
837 send_mos_cmd(serial, MOS_READ, MOS_MAX_PORT, 0x08, &data);
839 send_mos_cmd(serial, MOS_WRITE, MOS_MAX_PORT, 0x08, &data);
842 /***********************************************
843 * Set for higher rates *
844 ***********************************************/
847 send_mos_cmd(serial, MOS_WRITE, MOS_MAX_PORT, port_number + 1,&data);
850 send_mos_cmd(serial, MOS_READ, MOS_MAX_PORT, 0x08, &data);
852 send_mos_cmd(serial, MOS_WRITE, MOS_MAX_PORT, 0x08, &data);
855 mos7720_port->shadowMCR = data;
856 send_mos_cmd(serial, MOS_WRITE, port_number, 0x04, &data);
858 send_mos_cmd(serial, MOS_WRITE, port_number, 0x04, &data);
860 /***********************************************
862 ***********************************************/
864 data = mos7720_port->shadowLCR | UART_LCR_DLAB;
865 mos7720_port->shadowLCR = data;
866 send_mos_cmd(serial, MOS_WRITE, port_number, 0x03, &data);
868 data = 0x001; /* DLL */
869 send_mos_cmd(serial, MOS_WRITE, port_number, 0x00, &data);
870 data = 0x000; /* DLM */
871 send_mos_cmd(serial, MOS_WRITE, port_number, 0x01, &data);
873 data = mos7720_port->shadowLCR & ~UART_LCR_DLAB;
874 mos7720_port->shadowLCR = data;
875 send_mos_cmd(serial, MOS_WRITE, port_number, 0x03, &data);
880 /* baud rate information */
881 struct divisor_table_entry
887 /* Define table of divisors for moschip 7720 hardware *
888 * These assume a 3.6864MHz crystal, the standard /16, and *
890 static struct divisor_table_entry divisor_table[] = {
892 { 110, 1047}, /* 2094.545455 => 230450 => .0217 % over */
893 { 134, 857}, /* 1713.011152 => 230398.5 => .00065% under */
909 /*****************************************************************************
910 * calc_baud_rate_divisor
911 * this function calculates the proper baud rate divisor for the specified
913 *****************************************************************************/
914 static int calc_baud_rate_divisor(int baudrate, int *divisor)
922 dbg("%s - %d", __FUNCTION__, baudrate);
924 for (i = 0; i < ARRAY_SIZE(divisor_table); i++) {
925 if (divisor_table[i].baudrate == baudrate) {
926 *divisor = divisor_table[i].divisor;
931 /* After trying for all the standard baud rates *
932 * Try calculating the divisor for this baud rate */
933 if (baudrate > 75 && baudrate < 230400) {
934 /* get the divisor */
935 custom = (__u16)(230400L / baudrate);
937 /* Check for round off */
938 round1 = (__u16)(2304000L / baudrate);
939 round = (__u16)(round1 - (custom * 10));
944 dbg("Baud %d = %d",baudrate, custom);
948 dbg("Baud calculation Failed...");
953 * send_cmd_write_baud_rate
954 * this function sends the proper command to change the baud rate of the
957 static int send_cmd_write_baud_rate(struct moschip_port *mos7720_port,
960 struct usb_serial_port *port;
961 struct usb_serial *serial;
965 unsigned char number;
967 if (mos7720_port == NULL)
970 port = mos7720_port->port;
971 serial = port->serial;
973 dbg("%s: Entering ..........", __FUNCTION__);
975 number = port->number - port->serial->minor;
976 dbg("%s - port = %d, baud = %d", __FUNCTION__, port->number, baudrate);
978 /* Calculate the Divisor */
979 status = calc_baud_rate_divisor(baudrate, &divisor);
981 err("%s - bad baud rate", __FUNCTION__);
985 /* Enable access to divisor latch */
986 data = mos7720_port->shadowLCR | UART_LCR_DLAB;
987 mos7720_port->shadowLCR = data;
988 send_mos_cmd(serial, MOS_WRITE, number, UART_LCR, &data);
990 /* Write the divisor */
991 data = ((unsigned char)(divisor & 0xff));
992 send_mos_cmd(serial, MOS_WRITE, number, 0x00, &data);
994 data = ((unsigned char)((divisor & 0xff00) >> 8));
995 send_mos_cmd(serial, MOS_WRITE, number, 0x01, &data);
997 /* Disable access to divisor latch */
998 data = mos7720_port->shadowLCR & ~UART_LCR_DLAB;
999 mos7720_port->shadowLCR = data;
1000 send_mos_cmd(serial, MOS_WRITE, number, 0x03, &data);
1006 * change_port_settings
1007 * This routine is called to set the UART on the device to match
1008 * the specified new settings.
1010 static void change_port_settings(struct moschip_port *mos7720_port,
1011 struct ktermios *old_termios)
1013 struct usb_serial_port *port;
1014 struct usb_serial *serial;
1015 struct tty_struct *tty;
1027 if (mos7720_port == NULL)
1030 port = mos7720_port->port;
1031 serial = port->serial;
1032 port_number = port->number - port->serial->minor;
1034 dbg("%s - port %d", __FUNCTION__, port->number);
1036 if (!mos7720_port->open) {
1037 dbg("%s - port not opened", __FUNCTION__);
1041 tty = mos7720_port->port->tty;
1043 dbg("%s: Entering ..........", __FUNCTION__);
1045 lData = UART_LCR_WLEN8;
1046 lStop = 0x00; /* 1 stop bit */
1047 lParity = 0x00; /* No parity */
1049 cflag = tty->termios->c_cflag;
1050 iflag = tty->termios->c_iflag;
1052 /* Change the number of bits */
1053 switch (cflag & CSIZE) {
1055 lData = UART_LCR_WLEN5;
1060 lData = UART_LCR_WLEN6;
1065 lData = UART_LCR_WLEN7;
1070 lData = UART_LCR_WLEN8;
1074 /* Change the Parity bit */
1075 if (cflag & PARENB) {
1076 if (cflag & PARODD) {
1077 lParity = UART_LCR_PARITY;
1078 dbg("%s - parity = odd", __FUNCTION__);
1080 lParity = (UART_LCR_EPAR | UART_LCR_PARITY);
1081 dbg("%s - parity = even", __FUNCTION__);
1085 dbg("%s - parity = none", __FUNCTION__);
1089 lParity = lParity | 0x20;
1091 /* Change the Stop bit */
1092 if (cflag & CSTOPB) {
1093 lStop = UART_LCR_STOP;
1094 dbg("%s - stop bits = 2", __FUNCTION__);
1097 dbg("%s - stop bits = 1", __FUNCTION__);
1100 #define LCR_BITS_MASK 0x03 /* Mask for bits/char field */
1101 #define LCR_STOP_MASK 0x04 /* Mask for stop bits field */
1102 #define LCR_PAR_MASK 0x38 /* Mask for parity field */
1104 /* Update the LCR with the correct value */
1105 mos7720_port->shadowLCR &= ~(LCR_BITS_MASK | LCR_STOP_MASK | LCR_PAR_MASK);
1106 mos7720_port->shadowLCR |= (lData | lParity | lStop);
1109 /* Disable Interrupts */
1111 send_mos_cmd(serial,MOS_WRITE,port->number - port->serial->minor, UART_IER, &data);
1114 send_mos_cmd(serial, MOS_WRITE, port_number, UART_FCR, &data);
1117 send_mos_cmd(serial, MOS_WRITE, port_number, UART_FCR, &data);
1119 /* Send the updated LCR value to the mos7720 */
1120 data = mos7720_port->shadowLCR;
1121 send_mos_cmd(serial, MOS_WRITE, port_number, UART_LCR, &data);
1124 mos7720_port->shadowMCR = data;
1125 send_mos_cmd(serial, MOS_WRITE, port_number, 0x04, &data);
1127 send_mos_cmd(serial, MOS_WRITE, port_number, 0x04, &data);
1129 /* set up the MCR register and send it to the mos7720 */
1130 mos7720_port->shadowMCR = UART_MCR_OUT2;
1132 mos7720_port->shadowMCR |= (UART_MCR_DTR | UART_MCR_RTS);
1134 if (cflag & CRTSCTS) {
1135 mos7720_port->shadowMCR |= (UART_MCR_XONANY);
1137 /* To set hardware flow control to the specified *
1138 * serial port, in SP1/2_CONTROL_REG */
1141 send_mos_cmd(serial, MOS_WRITE, MOS_MAX_PORT,
1145 send_mos_cmd(serial, MOS_WRITE, MOS_MAX_PORT,
1149 mos7720_port->shadowMCR &= ~(UART_MCR_XONANY);
1152 data = mos7720_port->shadowMCR;
1153 send_mos_cmd(serial, MOS_WRITE, port_number, UART_MCR, &data);
1155 /* Determine divisor based on baud rate */
1156 baud = tty_get_baud_rate(tty);
1158 /* pick a default, any default... */
1159 dbg("Picked default baud...");
1163 if (baud >= 230400) {
1164 set_higher_rates(mos7720_port, baud);
1165 /* Enable Interrupts */
1167 send_mos_cmd(serial, MOS_WRITE, port_number, UART_IER, &data);
1171 dbg("%s - baud rate = %d", __FUNCTION__, baud);
1172 status = send_cmd_write_baud_rate(mos7720_port, baud);
1173 /* FIXME: needs to write actual resulting baud back not just
1176 tty_encode_baud_rate(tty, baud, baud);
1177 /* Enable Interrupts */
1179 send_mos_cmd(serial, MOS_WRITE, port_number, UART_IER, &data);
1181 if (port->read_urb->status != -EINPROGRESS) {
1182 port->read_urb->dev = serial->dev;
1184 status = usb_submit_urb(port->read_urb, GFP_ATOMIC);
1186 dbg("usb_submit_urb(read bulk) failed, status = %d",
1193 * mos7720_set_termios
1194 * this function is called by the tty driver when it wants to change the
1195 * termios structure.
1197 static void mos7720_set_termios(struct usb_serial_port *port,
1198 struct ktermios *old_termios)
1202 struct usb_serial *serial;
1203 struct moschip_port *mos7720_port;
1204 struct tty_struct *tty;
1206 serial = port->serial;
1208 mos7720_port = usb_get_serial_port_data(port);
1210 if (mos7720_port == NULL)
1216 if (!mos7720_port->open) {
1217 dbg("%s - port not opened", __FUNCTION__);
1221 dbg("%s\n","setting termios - ASPIRE");
1223 cflag = tty->termios->c_cflag;
1225 dbg("%s - cflag %08x iflag %08x", __FUNCTION__,
1226 tty->termios->c_cflag,
1227 RELEVANT_IFLAG(tty->termios->c_iflag));
1229 dbg("%s - old cflag %08x old iflag %08x", __FUNCTION__,
1230 old_termios->c_cflag,
1231 RELEVANT_IFLAG(old_termios->c_iflag));
1233 dbg("%s - port %d", __FUNCTION__, port->number);
1235 /* change the port settings to the new ones specified */
1236 change_port_settings(mos7720_port, old_termios);
1238 if(!port->read_urb) {
1239 dbg("%s","URB KILLED !!!!!\n");
1243 if(port->read_urb->status != -EINPROGRESS) {
1244 port->read_urb->dev = serial->dev;
1245 status = usb_submit_urb(port->read_urb, GFP_ATOMIC);
1247 dbg("usb_submit_urb(read bulk) failed, status = %d",
1254 * get_lsr_info - get line status register info
1256 * Purpose: Let user call ioctl() to get info when the UART physically
1257 * is emptied. On bus types like RS485, the transmitter must
1258 * release the bus after transmitting. This must be done when
1259 * the transmit shift register is empty, not be done when the
1260 * transmit holding register is empty. This functionality
1261 * allows an RS485 driver to be written in user space.
1263 static int get_lsr_info(struct moschip_port *mos7720_port,
1264 unsigned int __user *value)
1267 unsigned int result = 0;
1269 count = mos7720_chars_in_buffer(mos7720_port->port);
1271 dbg("%s -- Empty", __FUNCTION__);
1272 result = TIOCSER_TEMT;
1275 if (copy_to_user(value, &result, sizeof(int)))
1281 * get_number_bytes_avail - get number of bytes available
1283 * Purpose: Let user call ioctl to get the count of number of bytes available.
1285 static int get_number_bytes_avail(struct moschip_port *mos7720_port,
1286 unsigned int __user *value)
1288 unsigned int result = 0;
1289 struct tty_struct *tty = mos7720_port->port->tty;
1292 return -ENOIOCTLCMD;
1294 result = tty->read_cnt;
1296 dbg("%s(%d) = %d", __FUNCTION__, mos7720_port->port->number, result);
1297 if (copy_to_user(value, &result, sizeof(int)))
1300 return -ENOIOCTLCMD;
1303 static int set_modem_info(struct moschip_port *mos7720_port, unsigned int cmd,
1304 unsigned int __user *value)
1310 struct usb_serial_port *port;
1312 if (mos7720_port == NULL)
1315 port = (struct usb_serial_port*)mos7720_port->port;
1316 mcr = mos7720_port->shadowMCR;
1318 if (copy_from_user(&arg, value, sizeof(int)))
1323 if (arg & TIOCM_RTS)
1324 mcr |= UART_MCR_RTS;
1325 if (arg & TIOCM_DTR)
1326 mcr |= UART_MCR_RTS;
1327 if (arg & TIOCM_LOOP)
1328 mcr |= UART_MCR_LOOP;
1332 if (arg & TIOCM_RTS)
1333 mcr &= ~UART_MCR_RTS;
1334 if (arg & TIOCM_DTR)
1335 mcr &= ~UART_MCR_RTS;
1336 if (arg & TIOCM_LOOP)
1337 mcr &= ~UART_MCR_LOOP;
1341 /* turn off the RTS and DTR and LOOPBACK
1342 * and then only turn on what was asked to */
1343 mcr &= ~(UART_MCR_RTS | UART_MCR_DTR | UART_MCR_LOOP);
1344 mcr |= ((arg & TIOCM_RTS) ? UART_MCR_RTS : 0);
1345 mcr |= ((arg & TIOCM_DTR) ? UART_MCR_DTR : 0);
1346 mcr |= ((arg & TIOCM_LOOP) ? UART_MCR_LOOP : 0);
1350 mos7720_port->shadowMCR = mcr;
1352 data = mos7720_port->shadowMCR;
1353 send_mos_cmd(port->serial, MOS_WRITE,
1354 port->number - port->serial->minor, UART_MCR, &data);
1359 static int get_modem_info(struct moschip_port *mos7720_port,
1360 unsigned int __user *value)
1362 unsigned int result = 0;
1363 unsigned int msr = mos7720_port->shadowMSR;
1364 unsigned int mcr = mos7720_port->shadowMCR;
1366 result = ((mcr & UART_MCR_DTR) ? TIOCM_DTR: 0) /* 0x002 */
1367 | ((mcr & UART_MCR_RTS) ? TIOCM_RTS: 0) /* 0x004 */
1368 | ((msr & UART_MSR_CTS) ? TIOCM_CTS: 0) /* 0x020 */
1369 | ((msr & UART_MSR_DCD) ? TIOCM_CAR: 0) /* 0x040 */
1370 | ((msr & UART_MSR_RI) ? TIOCM_RI: 0) /* 0x080 */
1371 | ((msr & UART_MSR_DSR) ? TIOCM_DSR: 0); /* 0x100 */
1374 dbg("%s -- %x", __FUNCTION__, result);
1376 if (copy_to_user(value, &result, sizeof(int)))
1381 static int get_serial_info(struct moschip_port *mos7720_port,
1382 struct serial_struct __user *retinfo)
1384 struct serial_struct tmp;
1389 memset(&tmp, 0, sizeof(tmp));
1391 tmp.type = PORT_16550A;
1392 tmp.line = mos7720_port->port->serial->minor;
1393 tmp.port = mos7720_port->port->number;
1395 tmp.flags = ASYNC_SKIP_TEST | ASYNC_AUTO_IRQ;
1396 tmp.xmit_fifo_size = NUM_URBS * URB_TRANSFER_BUFFER_SIZE;
1397 tmp.baud_base = 9600;
1398 tmp.close_delay = 5*HZ;
1399 tmp.closing_wait = 30*HZ;
1401 if (copy_to_user(retinfo, &tmp, sizeof(*retinfo)))
1406 static int mos7720_ioctl(struct usb_serial_port *port, struct file *file,
1407 unsigned int cmd, unsigned long arg)
1409 struct moschip_port *mos7720_port;
1410 struct async_icount cnow;
1411 struct async_icount cprev;
1412 struct serial_icounter_struct icount;
1414 mos7720_port = usb_get_serial_port_data(port);
1415 if (mos7720_port == NULL)
1418 dbg("%s - port %d, cmd = 0x%x", __FUNCTION__, port->number, cmd);
1422 /* return number of bytes available */
1423 dbg("%s (%d) TIOCINQ", __FUNCTION__, port->number);
1424 return get_number_bytes_avail(mos7720_port,
1425 (unsigned int __user *)arg);
1429 dbg("%s (%d) TIOCSERGETLSR", __FUNCTION__, port->number);
1430 return get_lsr_info(mos7720_port, (unsigned int __user *)arg);
1436 dbg("%s (%d) TIOCMSET/TIOCMBIC/TIOCMSET", __FUNCTION__,
1438 return set_modem_info(mos7720_port, cmd,
1439 (unsigned int __user *)arg);
1442 dbg("%s (%d) TIOCMGET", __FUNCTION__, port->number);
1443 return get_modem_info(mos7720_port,
1444 (unsigned int __user *)arg);
1447 dbg("%s (%d) TIOCGSERIAL", __FUNCTION__, port->number);
1448 return get_serial_info(mos7720_port,
1449 (struct serial_struct __user *)arg);
1452 dbg("%s (%d) TIOCSSERIAL", __FUNCTION__, port->number);
1456 dbg("%s (%d) TIOCMIWAIT", __FUNCTION__, port->number);
1457 cprev = mos7720_port->icount;
1459 if (signal_pending(current))
1460 return -ERESTARTSYS;
1461 cnow = mos7720_port->icount;
1462 if (cnow.rng == cprev.rng && cnow.dsr == cprev.dsr &&
1463 cnow.dcd == cprev.dcd && cnow.cts == cprev.cts)
1464 return -EIO; /* no change => error */
1465 if (((arg & TIOCM_RNG) && (cnow.rng != cprev.rng)) ||
1466 ((arg & TIOCM_DSR) && (cnow.dsr != cprev.dsr)) ||
1467 ((arg & TIOCM_CD) && (cnow.dcd != cprev.dcd)) ||
1468 ((arg & TIOCM_CTS) && (cnow.cts != cprev.cts)) ) {
1477 cnow = mos7720_port->icount;
1478 icount.cts = cnow.cts;
1479 icount.dsr = cnow.dsr;
1480 icount.rng = cnow.rng;
1481 icount.dcd = cnow.dcd;
1482 icount.rx = cnow.rx;
1483 icount.tx = cnow.tx;
1484 icount.frame = cnow.frame;
1485 icount.overrun = cnow.overrun;
1486 icount.parity = cnow.parity;
1487 icount.brk = cnow.brk;
1488 icount.buf_overrun = cnow.buf_overrun;
1490 dbg("%s (%d) TIOCGICOUNT RX=%d, TX=%d", __FUNCTION__,
1491 port->number, icount.rx, icount.tx );
1492 if (copy_to_user((void __user *)arg, &icount, sizeof(icount)))
1497 return -ENOIOCTLCMD;
1500 static int mos7720_startup(struct usb_serial *serial)
1502 struct moschip_serial *mos7720_serial;
1503 struct moschip_port *mos7720_port;
1504 struct usb_device *dev;
1508 dbg("%s: Entering ..........", __FUNCTION__);
1511 dbg("Invalid Handler");
1517 /* create our private serial structure */
1518 mos7720_serial = kzalloc(sizeof(struct moschip_serial), GFP_KERNEL);
1519 if (mos7720_serial == NULL) {
1520 err("%s - Out of memory", __FUNCTION__);
1524 usb_set_serial_data(serial, mos7720_serial);
1526 /* we set up the pointers to the endpoints in the mos7720_open *
1527 * function, as the structures aren't created yet. */
1529 /* set up port private structures */
1530 for (i = 0; i < serial->num_ports; ++i) {
1531 mos7720_port = kzalloc(sizeof(struct moschip_port), GFP_KERNEL);
1532 if (mos7720_port == NULL) {
1533 err("%s - Out of memory", __FUNCTION__);
1534 usb_set_serial_data(serial, NULL);
1535 kfree(mos7720_serial);
1539 /* Initialize all port interrupt end point to port 0 int
1540 * endpoint. Our device has only one interrupt endpoint
1541 * comman to all ports */
1542 serial->port[i]->interrupt_in_endpointAddress = serial->port[0]->interrupt_in_endpointAddress;
1544 mos7720_port->port = serial->port[i];
1545 usb_set_serial_port_data(serial->port[i], mos7720_port);
1547 dbg("port number is %d", serial->port[i]->number);
1548 dbg("serial number is %d", serial->minor);
1552 /* setting configuration feature to one */
1553 usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0),
1554 (__u8)0x03, 0x00,0x01,0x00, NULL, 0x00, 5*HZ);
1556 send_mos_cmd(serial,MOS_READ,0x00, UART_LSR, &data); // LSR For Port 1
1559 send_mos_cmd(serial,MOS_READ,0x01, UART_LSR, &data); // LSR For Port 2
1565 static void mos7720_shutdown(struct usb_serial *serial)
1569 /* free private structure allocated for serial port */
1570 for (i=0; i < serial->num_ports; ++i) {
1571 kfree(usb_get_serial_port_data(serial->port[i]));
1572 usb_set_serial_port_data(serial->port[i], NULL);
1575 /* free private structure allocated for serial device */
1576 kfree(usb_get_serial_data(serial));
1577 usb_set_serial_data(serial, NULL);
1580 static struct usb_driver usb_driver = {
1581 .name = "moschip7720",
1582 .probe = usb_serial_probe,
1583 .disconnect = usb_serial_disconnect,
1584 .id_table = moschip_port_id_table,
1588 static struct usb_serial_driver moschip7720_2port_driver = {
1590 .owner = THIS_MODULE,
1591 .name = "moschip7720",
1593 .description = "Moschip 2 port adapter",
1594 .usb_driver = &usb_driver,
1595 .id_table = moschip_port_id_table,
1596 .num_interrupt_in = 1,
1600 .open = mos7720_open,
1601 .close = mos7720_close,
1602 .throttle = mos7720_throttle,
1603 .unthrottle = mos7720_unthrottle,
1604 .attach = mos7720_startup,
1605 .shutdown = mos7720_shutdown,
1606 .ioctl = mos7720_ioctl,
1607 .set_termios = mos7720_set_termios,
1608 .write = mos7720_write,
1609 .write_room = mos7720_write_room,
1610 .chars_in_buffer = mos7720_chars_in_buffer,
1611 .break_ctl = mos7720_break,
1612 .read_bulk_callback = mos7720_bulk_in_callback,
1613 .read_int_callback = mos7720_interrupt_callback,
1616 static int __init moschip7720_init(void)
1620 dbg("%s: Entering ..........", __FUNCTION__);
1622 /* Register with the usb serial */
1623 retval = usb_serial_register(&moschip7720_2port_driver);
1625 goto failed_port_device_register;
1627 info(DRIVER_DESC " " DRIVER_VERSION);
1629 /* Register with the usb */
1630 retval = usb_register(&usb_driver);
1632 goto failed_usb_register;
1636 failed_usb_register:
1637 usb_serial_deregister(&moschip7720_2port_driver);
1639 failed_port_device_register:
1643 static void __exit moschip7720_exit(void)
1645 usb_deregister(&usb_driver);
1646 usb_serial_deregister(&moschip7720_2port_driver);
1649 module_init(moschip7720_init);
1650 module_exit(moschip7720_exit);
1652 /* Module information */
1653 MODULE_AUTHOR( DRIVER_AUTHOR );
1654 MODULE_DESCRIPTION( DRIVER_DESC );
1655 MODULE_LICENSE("GPL");
1657 module_param(debug, bool, S_IRUGO | S_IWUSR);
1658 MODULE_PARM_DESC(debug, "Debug enabled or not");