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 <linux/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 */
68 __u8 shadowLCR; /* last LCR value received */
69 __u8 shadowMCR; /* last MCR value received */
70 __u8 shadowMSR; /* last MSR value received */
72 struct async_icount icount;
73 struct usb_serial_port *port; /* loop back to the owner */
74 struct urb *write_urb_pool[NUM_URBS];
77 /* This structure holds all of the individual serial device information */
78 struct moschip_serial {
79 int interrupt_started;
84 #define USB_VENDOR_ID_MOSCHIP 0x9710
85 #define MOSCHIP_DEVICE_ID_7720 0x7720
86 #define MOSCHIP_DEVICE_ID_7715 0x7715
88 static struct usb_device_id moschip_port_id_table[] = {
89 { USB_DEVICE(USB_VENDOR_ID_MOSCHIP, MOSCHIP_DEVICE_ID_7720) },
90 { } /* terminating entry */
92 MODULE_DEVICE_TABLE(usb, moschip_port_id_table);
96 * mos7720_interrupt_callback
97 * this is the callback function for when we have received data on the
100 static void mos7720_interrupt_callback(struct urb *urb)
104 int status = urb->status;
109 dbg("%s", " : Entering\n");
118 /* this urb is terminated, clean up */
119 dbg("%s - urb shutting down with status: %d", __func__,
123 dbg("%s - nonzero urb status received: %d", __func__,
128 length = urb->actual_length;
129 data = urb->transfer_buffer;
131 /* Moschip get 4 bytes
132 * Byte 1 IIR Port 1 (port.number is 0)
133 * Byte 2 IIR Port 2 (port.number is 1)
134 * Byte 3 --------------
135 * Byte 4 FIFO status for both */
137 /* the above description is inverted
138 * oneukum 2007-03-14 */
140 if (unlikely(length != 4)) {
141 dbg("Wrong data !!!");
148 if ((sp1 | sp2) & 0x01) {
149 /* No Interrupt Pending in both the ports */
150 dbg("No Interrupt !!!");
152 switch (sp1 & 0x0f) {
154 dbg("Serial Port 1: Receiver status error or address "
155 "bit detected in 9-bit mode\n");
158 dbg("Serial Port 1: Receiver time out");
161 dbg("Serial Port 1: Modem status change");
165 switch (sp2 & 0x0f) {
167 dbg("Serial Port 2: Receiver status error or address "
168 "bit detected in 9-bit mode");
171 dbg("Serial Port 2: Receiver time out");
174 dbg("Serial Port 2: Modem status change");
180 result = usb_submit_urb(urb, GFP_ATOMIC);
182 dev_err(&urb->dev->dev,
183 "%s - Error %d submitting control urb\n",
189 * mos7720_bulk_in_callback
190 * this is the callback function for when we have received data on the
193 static void mos7720_bulk_in_callback(struct urb *urb)
196 unsigned char *data ;
197 struct usb_serial_port *port;
198 struct moschip_port *mos7720_port;
199 struct tty_struct *tty;
200 int status = urb->status;
203 dbg("nonzero read bulk status received: %d", status);
207 mos7720_port = urb->context;
209 dbg("%s", "NULL mos7720_port pointer \n");
213 port = mos7720_port->port;
215 dbg("Entering...%s", __func__);
217 data = urb->transfer_buffer;
219 tty = tty_port_tty_get(&port->port);
220 if (tty && urb->actual_length) {
221 tty_buffer_request_room(tty, urb->actual_length);
222 tty_insert_flip_string(tty, data, urb->actual_length);
223 tty_flip_buffer_push(tty);
227 if (!port->read_urb) {
228 dbg("URB KILLED !!!");
232 if (port->read_urb->status != -EINPROGRESS) {
233 port->read_urb->dev = port->serial->dev;
235 retval = usb_submit_urb(port->read_urb, GFP_ATOMIC);
237 dbg("usb_submit_urb(read bulk) failed, retval = %d",
243 * mos7720_bulk_out_data_callback
244 * this is the callback function for when we have finished sending serial
245 * data on the bulk out endpoint.
247 static void mos7720_bulk_out_data_callback(struct urb *urb)
249 struct moschip_port *mos7720_port;
250 struct tty_struct *tty;
251 int status = urb->status;
254 dbg("nonzero write bulk status received:%d", status);
258 mos7720_port = urb->context;
260 dbg("NULL mos7720_port pointer");
264 dbg("Entering .........");
266 tty = tty_port_tty_get(&mos7720_port->port->port);
268 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;
293 if ((product == MOSCHIP_DEVICE_ID_7715) &&
295 dbg("serial->product== MOSCHIP_DEVICE_ID_7715");
300 if (request == MOS_WRITE) {
301 request = (__u8)MOS_WRITE;
302 requesttype = (__u8)0x40;
303 value = value + (__u16)*((unsigned char *)data);
305 pipe = usb_sndctrlpipe(serial->dev, 0);
307 request = (__u8)MOS_READ;
308 requesttype = (__u8)0xC0;
310 pipe = usb_rcvctrlpipe(serial->dev, 0);
313 status = usb_control_msg(serial->dev, pipe, request, requesttype,
314 value, index, data, size, MOS_WDR_TIMEOUT);
317 dbg("Command Write failed Value %x index %x\n", value, index);
322 static int mos7720_open(struct tty_struct *tty,
323 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 dev_err(&port->dev, "No more urbs???\n");
362 urb->transfer_buffer = kmalloc(URB_TRANSFER_BUFFER_SIZE,
364 if (!urb->transfer_buffer) {
366 "%s-out of memory for urb buffers.\n",
368 usb_free_urb(mos7720_port->write_urb_pool[j]);
369 mos7720_port->write_urb_pool[j] = NULL;
378 /* Initialize MCS7720 -- Write Init values to corresponding Registers
390 * 0x08 : SP1/2 Control Reg
392 port_number = port->number - port->serial->minor;
393 send_mos_cmd(port->serial, MOS_READ, port_number, UART_LSR, &data);
394 dbg("SS::%p LSR:%x\n", mos7720_port, data);
396 dbg("Check:Sending Command ..........");
399 send_mos_cmd(serial, MOS_WRITE, MOS_MAX_PORT, 0x01, &data);
401 send_mos_cmd(serial, MOS_WRITE, MOS_MAX_PORT, 0x02, &data);
404 send_mos_cmd(serial, MOS_WRITE, port_number, 0x01, &data);
406 send_mos_cmd(serial, MOS_WRITE, port_number, 0x02, &data);
409 send_mos_cmd(serial, MOS_WRITE, port_number, 0x02, &data);
411 mos7720_port->shadowLCR = data;
412 send_mos_cmd(serial, MOS_WRITE, port_number, 0x03, &data);
414 mos7720_port->shadowMCR = data;
415 send_mos_cmd(serial, MOS_WRITE, port_number, 0x04, &data);
417 send_mos_cmd(serial, MOS_WRITE, port_number, 0x04, &data);
420 send_mos_cmd(serial, MOS_READ, MOS_MAX_PORT, 0x08, &data);
422 send_mos_cmd(serial, MOS_WRITE, MOS_MAX_PORT, 0x08, &data);
425 send_mos_cmd(serial, MOS_READ, MOS_MAX_PORT, port_number + 1, &data);
427 send_mos_cmd(serial, MOS_WRITE, MOS_MAX_PORT, port_number + 1, &data);
429 send_mos_cmd(port->serial, MOS_WRITE, MOS_MAX_PORT,
430 port_number + 1, &data);
433 send_mos_cmd(serial, MOS_READ, MOS_MAX_PORT, 0x08, &data);
435 data = data | (port->number - port->serial->minor + 1);
436 send_mos_cmd(serial, MOS_WRITE, MOS_MAX_PORT, 0x08, &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, 0x00, &data);
444 send_mos_cmd(serial, MOS_WRITE, port_number, 0x01, &data);
446 mos7720_port->shadowLCR = data;
447 send_mos_cmd(serial, MOS_WRITE, port_number, 0x03, &data);
449 send_mos_cmd(serial, MOS_WRITE, port_number, 0x01, &data);
451 send_mos_cmd(serial, MOS_WRITE, port_number, 0x01, &data);
453 /* see if we've set up our endpoint info yet *
454 * (can't set it up in mos7720_startup as the *
455 * structures were not set up at that time.) */
456 if (!mos7720_serial->interrupt_started) {
457 dbg("Interrupt buffer NULL !!!");
459 /* not set up yet, so do it now */
460 mos7720_serial->interrupt_started = 1;
462 dbg("To Submit URB !!!");
464 /* set up our interrupt urb */
465 usb_fill_int_urb(port0->interrupt_in_urb, serial->dev,
466 usb_rcvintpipe(serial->dev,
467 port->interrupt_in_endpointAddress),
468 port0->interrupt_in_buffer,
469 port0->interrupt_in_urb->transfer_buffer_length,
470 mos7720_interrupt_callback, mos7720_port,
471 port0->interrupt_in_urb->interval);
473 /* start interrupt read for this mos7720 this interrupt *
474 * will continue as long as the mos7720 is connected */
475 dbg("Submit URB over !!!");
476 response = usb_submit_urb(port0->interrupt_in_urb, GFP_KERNEL);
479 "%s - Error %d submitting control urb\n",
483 /* set up our bulk in urb */
484 usb_fill_bulk_urb(port->read_urb, serial->dev,
485 usb_rcvbulkpipe(serial->dev,
486 port->bulk_in_endpointAddress),
487 port->bulk_in_buffer,
488 port->read_urb->transfer_buffer_length,
489 mos7720_bulk_in_callback, mos7720_port);
490 response = usb_submit_urb(port->read_urb, GFP_KERNEL);
492 dev_err(&port->dev, "%s - Error %d submitting read urb\n",
495 /* initialize our icount structure */
496 memset(&(mos7720_port->icount), 0x00, sizeof(mos7720_port->icount));
498 /* initialize our port settings */
499 mos7720_port->shadowMCR = UART_MCR_OUT2; /* Must set to enable ints! */
501 /* send a open port command */
502 mos7720_port->open = 1;
508 * mos7720_chars_in_buffer
509 * this function is called by the tty driver when it wants to know how many
510 * bytes of data we currently have outstanding in the port (data that has
511 * been written, but hasn't made it out the port yet)
512 * If successful, we return the number of bytes left to be written in the
514 * Otherwise we return a negative error number.
516 static int mos7720_chars_in_buffer(struct tty_struct *tty)
518 struct usb_serial_port *port = tty->driver_data;
521 struct moschip_port *mos7720_port;
523 dbg("%s:entering ...........", __func__);
525 mos7720_port = usb_get_serial_port_data(port);
526 if (mos7720_port == NULL) {
527 dbg("%s:leaving ...........", __func__);
531 for (i = 0; i < NUM_URBS; ++i) {
532 if (mos7720_port->write_urb_pool[i] &&
533 mos7720_port->write_urb_pool[i]->status == -EINPROGRESS)
534 chars += URB_TRANSFER_BUFFER_SIZE;
536 dbg("%s - returns %d", __func__, chars);
540 static void mos7720_close(struct usb_serial_port *port)
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, otherwise nop */
568 dbg("Shutdown bulk write");
569 usb_kill_urb(port->write_urb);
570 dbg("Shutdown bulk read");
571 usb_kill_urb(port->read_urb);
573 mutex_lock(&serial->disc_mutex);
574 /* these commands must not be issued if the device has
575 * been disconnected */
576 if (!serial->disconnected) {
578 send_mos_cmd(serial, MOS_WRITE,
579 port->number - port->serial->minor, 0x04, &data);
582 send_mos_cmd(serial, MOS_WRITE,
583 port->number - port->serial->minor, 0x01, &data);
585 mutex_unlock(&serial->disc_mutex);
586 mos7720_port->open = 0;
588 dbg("Leaving %s", __func__);
591 static void mos7720_break(struct tty_struct *tty, int break_state)
593 struct usb_serial_port *port = tty->driver_data;
595 struct usb_serial *serial;
596 struct moschip_port *mos7720_port;
598 dbg("Entering %s", __func__);
600 serial = port->serial;
602 mos7720_port = usb_get_serial_port_data(port);
603 if (mos7720_port == NULL)
606 if (break_state == -1)
607 data = mos7720_port->shadowLCR | UART_LCR_SBC;
609 data = mos7720_port->shadowLCR & ~UART_LCR_SBC;
611 mos7720_port->shadowLCR = data;
612 send_mos_cmd(serial, MOS_WRITE, port->number - port->serial->minor,
620 * this function is called by the tty driver when it wants to know how many
621 * bytes of data we can accept for a specific port.
622 * If successful, we return the amount of room that we have for this port
623 * Otherwise we return a negative error number.
625 static int mos7720_write_room(struct tty_struct *tty)
627 struct usb_serial_port *port = tty->driver_data;
628 struct moschip_port *mos7720_port;
632 dbg("%s:entering ...........", __func__);
634 mos7720_port = usb_get_serial_port_data(port);
635 if (mos7720_port == NULL) {
636 dbg("%s:leaving ...........", __func__);
641 for (i = 0; i < NUM_URBS; ++i) {
642 if (mos7720_port->write_urb_pool[i] &&
643 mos7720_port->write_urb_pool[i]->status != -EINPROGRESS)
644 room += URB_TRANSFER_BUFFER_SIZE;
647 dbg("%s - returns %d", __func__, room);
651 static int mos7720_write(struct tty_struct *tty, struct usb_serial_port *port,
652 const unsigned char *data, int count)
659 struct moschip_port *mos7720_port;
660 struct usb_serial *serial;
662 const unsigned char *current_position = data;
664 dbg("%s:entering ...........", __func__);
666 serial = port->serial;
668 mos7720_port = usb_get_serial_port_data(port);
669 if (mos7720_port == NULL) {
670 dbg("mos7720_port is NULL");
674 /* try to find a free urb in the list */
677 for (i = 0; i < NUM_URBS; ++i) {
678 if (mos7720_port->write_urb_pool[i] &&
679 mos7720_port->write_urb_pool[i]->status != -EINPROGRESS) {
680 urb = mos7720_port->write_urb_pool[i];
687 dbg("%s - no more free urbs", __func__);
691 if (urb->transfer_buffer == NULL) {
692 urb->transfer_buffer = kmalloc(URB_TRANSFER_BUFFER_SIZE,
694 if (urb->transfer_buffer == NULL) {
695 dev_err(&port->dev, "%s no more kernel memory...\n",
700 transfer_size = min(count, URB_TRANSFER_BUFFER_SIZE);
702 memcpy(urb->transfer_buffer, current_position, transfer_size);
703 usb_serial_debug_data(debug, &port->dev, __func__, transfer_size,
704 urb->transfer_buffer);
706 /* fill urb with data and submit */
707 usb_fill_bulk_urb(urb, serial->dev,
708 usb_sndbulkpipe(serial->dev,
709 port->bulk_out_endpointAddress),
710 urb->transfer_buffer, transfer_size,
711 mos7720_bulk_out_data_callback, mos7720_port);
713 /* send it down the pipe */
714 status = usb_submit_urb(urb, GFP_ATOMIC);
716 dev_err(&port->dev, "%s - usb_submit_urb(write bulk) failed "
717 "with status = %d\n", __func__, status);
721 bytes_sent = transfer_size;
727 static void mos7720_throttle(struct tty_struct *tty)
729 struct usb_serial_port *port = tty->driver_data;
730 struct moschip_port *mos7720_port;
733 dbg("%s- port %d\n", __func__, port->number);
735 mos7720_port = usb_get_serial_port_data(port);
737 if (mos7720_port == NULL)
740 if (!mos7720_port->open) {
741 dbg("port not opened");
745 dbg("%s: Entering ..........", __func__);
747 /* if we are implementing XON/XOFF, send the stop character */
749 unsigned char stop_char = STOP_CHAR(tty);
750 status = mos7720_write(tty, port, &stop_char, 1);
755 /* if we are implementing RTS/CTS, toggle that line */
756 if (tty->termios->c_cflag & CRTSCTS) {
757 mos7720_port->shadowMCR &= ~UART_MCR_RTS;
758 status = send_mos_cmd(port->serial, MOS_WRITE,
759 port->number - port->serial->minor,
760 UART_MCR, &mos7720_port->shadowMCR);
766 static void mos7720_unthrottle(struct tty_struct *tty)
768 struct usb_serial_port *port = tty->driver_data;
769 struct moschip_port *mos7720_port = usb_get_serial_port_data(port);
772 if (mos7720_port == NULL)
775 if (!mos7720_port->open) {
776 dbg("%s - port not opened", __func__);
780 dbg("%s: Entering ..........", __func__);
782 /* if we are implementing XON/XOFF, send the start character */
784 unsigned char start_char = START_CHAR(tty);
785 status = mos7720_write(tty, port, &start_char, 1);
790 /* if we are implementing RTS/CTS, toggle that line */
791 if (tty->termios->c_cflag & CRTSCTS) {
792 mos7720_port->shadowMCR |= UART_MCR_RTS;
793 status = send_mos_cmd(port->serial, MOS_WRITE,
794 port->number - port->serial->minor,
795 UART_MCR, &mos7720_port->shadowMCR);
801 static int set_higher_rates(struct moschip_port *mos7720_port,
805 struct usb_serial_port *port;
806 struct usb_serial *serial;
809 if (mos7720_port == NULL)
812 port = mos7720_port->port;
813 serial = port->serial;
815 /***********************************************
816 * Init Sequence for higher rates
817 ***********************************************/
818 dbg("Sending Setting Commands ..........");
819 port_number = port->number - port->serial->minor;
822 send_mos_cmd(serial, MOS_WRITE, port_number, 0x01, &data);
824 send_mos_cmd(serial, MOS_WRITE, port_number, 0x02, &data);
826 send_mos_cmd(serial, MOS_WRITE, port->number, 0x02, &data);
828 mos7720_port->shadowMCR = data;
829 send_mos_cmd(serial, MOS_WRITE, port_number, 0x04, &data);
831 send_mos_cmd(serial, MOS_WRITE, port_number, 0x04, &data);
834 send_mos_cmd(serial, MOS_READ, MOS_MAX_PORT, 0x08, &data);
836 send_mos_cmd(serial, MOS_WRITE, MOS_MAX_PORT, 0x08, &data);
839 /***********************************************
840 * Set for higher rates *
841 ***********************************************/
844 send_mos_cmd(serial, MOS_WRITE, MOS_MAX_PORT, port_number + 1, &data);
847 send_mos_cmd(serial, MOS_READ, MOS_MAX_PORT, 0x08, &data);
849 send_mos_cmd(serial, MOS_WRITE, MOS_MAX_PORT, 0x08, &data);
852 mos7720_port->shadowMCR = data;
853 send_mos_cmd(serial, MOS_WRITE, port_number, 0x04, &data);
855 send_mos_cmd(serial, MOS_WRITE, port_number, 0x04, &data);
857 /***********************************************
859 ***********************************************/
861 data = mos7720_port->shadowLCR | UART_LCR_DLAB;
862 mos7720_port->shadowLCR = data;
863 send_mos_cmd(serial, MOS_WRITE, port_number, 0x03, &data);
865 data = 0x001; /* DLL */
866 send_mos_cmd(serial, MOS_WRITE, port_number, 0x00, &data);
867 data = 0x000; /* DLM */
868 send_mos_cmd(serial, MOS_WRITE, port_number, 0x01, &data);
870 data = mos7720_port->shadowLCR & ~UART_LCR_DLAB;
871 mos7720_port->shadowLCR = data;
872 send_mos_cmd(serial, MOS_WRITE, port_number, 0x03, &data);
877 /* baud rate information */
878 struct divisor_table_entry {
883 /* Define table of divisors for moschip 7720 hardware *
884 * These assume a 3.6864MHz crystal, the standard /16, and *
886 static struct divisor_table_entry divisor_table[] = {
888 { 110, 1047}, /* 2094.545455 => 230450 => .0217 % over */
889 { 134, 857}, /* 1713.011152 => 230398.5 => .00065% under */
905 /*****************************************************************************
906 * calc_baud_rate_divisor
907 * this function calculates the proper baud rate divisor for the specified
909 *****************************************************************************/
910 static int calc_baud_rate_divisor(int baudrate, int *divisor)
918 dbg("%s - %d", __func__, baudrate);
920 for (i = 0; i < ARRAY_SIZE(divisor_table); i++) {
921 if (divisor_table[i].baudrate == baudrate) {
922 *divisor = divisor_table[i].divisor;
927 /* After trying for all the standard baud rates *
928 * Try calculating the divisor for this baud rate */
929 if (baudrate > 75 && baudrate < 230400) {
930 /* get the divisor */
931 custom = (__u16)(230400L / baudrate);
933 /* Check for round off */
934 round1 = (__u16)(2304000L / baudrate);
935 round = (__u16)(round1 - (custom * 10));
940 dbg("Baud %d = %d", baudrate, custom);
944 dbg("Baud calculation Failed...");
949 * send_cmd_write_baud_rate
950 * this function sends the proper command to change the baud rate of the
953 static int send_cmd_write_baud_rate(struct moschip_port *mos7720_port,
956 struct usb_serial_port *port;
957 struct usb_serial *serial;
961 unsigned char number;
963 if (mos7720_port == NULL)
966 port = mos7720_port->port;
967 serial = port->serial;
969 dbg("%s: Entering ..........", __func__);
971 number = port->number - port->serial->minor;
972 dbg("%s - port = %d, baud = %d", __func__, port->number, baudrate);
974 /* Calculate the Divisor */
975 status = calc_baud_rate_divisor(baudrate, &divisor);
977 dev_err(&port->dev, "%s - bad baud rate\n", __func__);
981 /* Enable access to divisor latch */
982 data = mos7720_port->shadowLCR | UART_LCR_DLAB;
983 mos7720_port->shadowLCR = data;
984 send_mos_cmd(serial, MOS_WRITE, number, UART_LCR, &data);
986 /* Write the divisor */
987 data = ((unsigned char)(divisor & 0xff));
988 send_mos_cmd(serial, MOS_WRITE, number, 0x00, &data);
990 data = ((unsigned char)((divisor & 0xff00) >> 8));
991 send_mos_cmd(serial, MOS_WRITE, number, 0x01, &data);
993 /* Disable access to divisor latch */
994 data = mos7720_port->shadowLCR & ~UART_LCR_DLAB;
995 mos7720_port->shadowLCR = data;
996 send_mos_cmd(serial, MOS_WRITE, number, 0x03, &data);
1002 * change_port_settings
1003 * This routine is called to set the UART on the device to match
1004 * the specified new settings.
1006 static void change_port_settings(struct tty_struct *tty,
1007 struct moschip_port *mos7720_port,
1008 struct ktermios *old_termios)
1010 struct usb_serial_port *port;
1011 struct usb_serial *serial;
1023 if (mos7720_port == NULL)
1026 port = mos7720_port->port;
1027 serial = port->serial;
1028 port_number = port->number - port->serial->minor;
1030 dbg("%s - port %d", __func__, port->number);
1032 if (!mos7720_port->open) {
1033 dbg("%s - port not opened", __func__);
1037 dbg("%s: Entering ..........", __func__);
1039 lData = UART_LCR_WLEN8;
1040 lStop = 0x00; /* 1 stop bit */
1041 lParity = 0x00; /* No parity */
1043 cflag = tty->termios->c_cflag;
1044 iflag = tty->termios->c_iflag;
1046 /* Change the number of bits */
1047 switch (cflag & CSIZE) {
1049 lData = UART_LCR_WLEN5;
1054 lData = UART_LCR_WLEN6;
1059 lData = UART_LCR_WLEN7;
1064 lData = UART_LCR_WLEN8;
1068 /* Change the Parity bit */
1069 if (cflag & PARENB) {
1070 if (cflag & PARODD) {
1071 lParity = UART_LCR_PARITY;
1072 dbg("%s - parity = odd", __func__);
1074 lParity = (UART_LCR_EPAR | UART_LCR_PARITY);
1075 dbg("%s - parity = even", __func__);
1079 dbg("%s - parity = none", __func__);
1083 lParity = lParity | 0x20;
1085 /* Change the Stop bit */
1086 if (cflag & CSTOPB) {
1087 lStop = UART_LCR_STOP;
1088 dbg("%s - stop bits = 2", __func__);
1091 dbg("%s - stop bits = 1", __func__);
1094 #define LCR_BITS_MASK 0x03 /* Mask for bits/char field */
1095 #define LCR_STOP_MASK 0x04 /* Mask for stop bits field */
1096 #define LCR_PAR_MASK 0x38 /* Mask for parity field */
1098 /* Update the LCR with the correct value */
1099 mos7720_port->shadowLCR &=
1100 ~(LCR_BITS_MASK | LCR_STOP_MASK | LCR_PAR_MASK);
1101 mos7720_port->shadowLCR |= (lData | lParity | lStop);
1104 /* Disable Interrupts */
1106 send_mos_cmd(serial, MOS_WRITE, port->number - port->serial->minor,
1110 send_mos_cmd(serial, MOS_WRITE, port_number, UART_FCR, &data);
1113 send_mos_cmd(serial, MOS_WRITE, port_number, UART_FCR, &data);
1115 /* Send the updated LCR value to the mos7720 */
1116 data = mos7720_port->shadowLCR;
1117 send_mos_cmd(serial, MOS_WRITE, port_number, UART_LCR, &data);
1120 mos7720_port->shadowMCR = data;
1121 send_mos_cmd(serial, MOS_WRITE, port_number, 0x04, &data);
1123 send_mos_cmd(serial, MOS_WRITE, port_number, 0x04, &data);
1125 /* set up the MCR register and send it to the mos7720 */
1126 mos7720_port->shadowMCR = UART_MCR_OUT2;
1128 mos7720_port->shadowMCR |= (UART_MCR_DTR | UART_MCR_RTS);
1130 if (cflag & CRTSCTS) {
1131 mos7720_port->shadowMCR |= (UART_MCR_XONANY);
1132 /* To set hardware flow control to the specified *
1133 * serial port, in SP1/2_CONTROL_REG */
1136 send_mos_cmd(serial, MOS_WRITE, MOS_MAX_PORT,
1140 send_mos_cmd(serial, MOS_WRITE, MOS_MAX_PORT,
1144 mos7720_port->shadowMCR &= ~(UART_MCR_XONANY);
1147 data = mos7720_port->shadowMCR;
1148 send_mos_cmd(serial, MOS_WRITE, port_number, UART_MCR, &data);
1150 /* Determine divisor based on baud rate */
1151 baud = tty_get_baud_rate(tty);
1153 /* pick a default, any default... */
1154 dbg("Picked default baud...");
1158 if (baud >= 230400) {
1159 set_higher_rates(mos7720_port, baud);
1160 /* Enable Interrupts */
1162 send_mos_cmd(serial, MOS_WRITE, port_number, UART_IER, &data);
1166 dbg("%s - baud rate = %d", __func__, baud);
1167 status = send_cmd_write_baud_rate(mos7720_port, baud);
1168 /* FIXME: needs to write actual resulting baud back not just
1171 tty_encode_baud_rate(tty, baud, baud);
1172 /* Enable Interrupts */
1174 send_mos_cmd(serial, MOS_WRITE, port_number, UART_IER, &data);
1176 if (port->read_urb->status != -EINPROGRESS) {
1177 port->read_urb->dev = serial->dev;
1179 status = usb_submit_urb(port->read_urb, GFP_ATOMIC);
1181 dbg("usb_submit_urb(read bulk) failed, status = %d",
1188 * mos7720_set_termios
1189 * this function is called by the tty driver when it wants to change the
1190 * termios structure.
1192 static void mos7720_set_termios(struct tty_struct *tty,
1193 struct usb_serial_port *port, struct ktermios *old_termios)
1197 struct usb_serial *serial;
1198 struct moschip_port *mos7720_port;
1200 serial = port->serial;
1202 mos7720_port = usb_get_serial_port_data(port);
1204 if (mos7720_port == NULL)
1207 if (!mos7720_port->open) {
1208 dbg("%s - port not opened", __func__);
1212 dbg("%s\n", "setting termios - ASPIRE");
1214 cflag = tty->termios->c_cflag;
1216 dbg("%s - cflag %08x iflag %08x", __func__,
1217 tty->termios->c_cflag,
1218 RELEVANT_IFLAG(tty->termios->c_iflag));
1220 dbg("%s - old cflag %08x old iflag %08x", __func__,
1221 old_termios->c_cflag,
1222 RELEVANT_IFLAG(old_termios->c_iflag));
1224 dbg("%s - port %d", __func__, port->number);
1226 /* change the port settings to the new ones specified */
1227 change_port_settings(tty, mos7720_port, old_termios);
1229 if (!port->read_urb) {
1230 dbg("%s", "URB KILLED !!!!!\n");
1234 if (port->read_urb->status != -EINPROGRESS) {
1235 port->read_urb->dev = serial->dev;
1236 status = usb_submit_urb(port->read_urb, GFP_ATOMIC);
1238 dbg("usb_submit_urb(read bulk) failed, status = %d",
1245 * get_lsr_info - get line status register info
1247 * Purpose: Let user call ioctl() to get info when the UART physically
1248 * is emptied. On bus types like RS485, the transmitter must
1249 * release the bus after transmitting. This must be done when
1250 * the transmit shift register is empty, not be done when the
1251 * transmit holding register is empty. This functionality
1252 * allows an RS485 driver to be written in user space.
1254 static int get_lsr_info(struct tty_struct *tty,
1255 struct moschip_port *mos7720_port, unsigned int __user *value)
1257 struct usb_serial_port *port = tty->driver_data;
1258 unsigned int result = 0;
1259 unsigned char data = 0;
1260 int port_number = port->number - port->serial->minor;
1263 count = mos7720_chars_in_buffer(tty);
1265 send_mos_cmd(port->serial, MOS_READ, port_number,
1267 if ((data & (UART_LSR_TEMT | UART_LSR_THRE))
1268 == (UART_LSR_TEMT | UART_LSR_THRE)) {
1269 dbg("%s -- Empty", __func__);
1270 result = TIOCSER_TEMT;
1273 if (copy_to_user(value, &result, sizeof(int)))
1278 static int mos7720_tiocmget(struct tty_struct *tty, struct file *file)
1280 struct usb_serial_port *port = tty->driver_data;
1281 struct moschip_port *mos7720_port = usb_get_serial_port_data(port);
1282 unsigned int result = 0;
1286 dbg("%s - port %d", __func__, port->number);
1288 mcr = mos7720_port->shadowMCR;
1289 msr = mos7720_port->shadowMSR;
1291 result = ((mcr & UART_MCR_DTR) ? TIOCM_DTR : 0) /* 0x002 */
1292 | ((mcr & UART_MCR_RTS) ? TIOCM_RTS : 0) /* 0x004 */
1293 | ((msr & UART_MSR_CTS) ? TIOCM_CTS : 0) /* 0x020 */
1294 | ((msr & UART_MSR_DCD) ? TIOCM_CAR : 0) /* 0x040 */
1295 | ((msr & UART_MSR_RI) ? TIOCM_RI : 0) /* 0x080 */
1296 | ((msr & UART_MSR_DSR) ? TIOCM_DSR : 0); /* 0x100 */
1298 dbg("%s -- %x", __func__, result);
1303 static int mos7720_tiocmset(struct tty_struct *tty, struct file *file,
1304 unsigned int set, unsigned int clear)
1306 struct usb_serial_port *port = tty->driver_data;
1307 struct moschip_port *mos7720_port = usb_get_serial_port_data(port);
1311 dbg("%s - port %d", __func__, port->number);
1312 dbg("he was at tiocmget");
1314 mcr = mos7720_port->shadowMCR;
1316 if (set & TIOCM_RTS)
1317 mcr |= UART_MCR_RTS;
1318 if (set & TIOCM_DTR)
1319 mcr |= UART_MCR_DTR;
1320 if (set & TIOCM_LOOP)
1321 mcr |= UART_MCR_LOOP;
1323 if (clear & TIOCM_RTS)
1324 mcr &= ~UART_MCR_RTS;
1325 if (clear & TIOCM_DTR)
1326 mcr &= ~UART_MCR_DTR;
1327 if (clear & TIOCM_LOOP)
1328 mcr &= ~UART_MCR_LOOP;
1330 mos7720_port->shadowMCR = mcr;
1331 lmcr = mos7720_port->shadowMCR;
1333 send_mos_cmd(port->serial, MOS_WRITE,
1334 port->number - port->serial->minor, UART_MCR, &lmcr);
1339 static int set_modem_info(struct moschip_port *mos7720_port, unsigned int cmd,
1340 unsigned int __user *value)
1346 struct usb_serial_port *port;
1348 if (mos7720_port == NULL)
1351 port = (struct usb_serial_port *)mos7720_port->port;
1352 mcr = mos7720_port->shadowMCR;
1354 if (copy_from_user(&arg, value, sizeof(int)))
1359 if (arg & TIOCM_RTS)
1360 mcr |= UART_MCR_RTS;
1361 if (arg & TIOCM_DTR)
1362 mcr |= UART_MCR_RTS;
1363 if (arg & TIOCM_LOOP)
1364 mcr |= UART_MCR_LOOP;
1368 if (arg & TIOCM_RTS)
1369 mcr &= ~UART_MCR_RTS;
1370 if (arg & TIOCM_DTR)
1371 mcr &= ~UART_MCR_RTS;
1372 if (arg & TIOCM_LOOP)
1373 mcr &= ~UART_MCR_LOOP;
1378 mos7720_port->shadowMCR = mcr;
1380 data = mos7720_port->shadowMCR;
1381 send_mos_cmd(port->serial, MOS_WRITE,
1382 port->number - port->serial->minor, UART_MCR, &data);
1387 static int get_serial_info(struct moschip_port *mos7720_port,
1388 struct serial_struct __user *retinfo)
1390 struct serial_struct tmp;
1395 memset(&tmp, 0, sizeof(tmp));
1397 tmp.type = PORT_16550A;
1398 tmp.line = mos7720_port->port->serial->minor;
1399 tmp.port = mos7720_port->port->number;
1401 tmp.flags = ASYNC_SKIP_TEST | ASYNC_AUTO_IRQ;
1402 tmp.xmit_fifo_size = NUM_URBS * URB_TRANSFER_BUFFER_SIZE;
1403 tmp.baud_base = 9600;
1404 tmp.close_delay = 5*HZ;
1405 tmp.closing_wait = 30*HZ;
1407 if (copy_to_user(retinfo, &tmp, sizeof(*retinfo)))
1412 static int mos7720_ioctl(struct tty_struct *tty, struct file *file,
1413 unsigned int cmd, unsigned long arg)
1415 struct usb_serial_port *port = tty->driver_data;
1416 struct moschip_port *mos7720_port;
1417 struct async_icount cnow;
1418 struct async_icount cprev;
1419 struct serial_icounter_struct icount;
1421 mos7720_port = usb_get_serial_port_data(port);
1422 if (mos7720_port == NULL)
1425 dbg("%s - port %d, cmd = 0x%x", __func__, port->number, cmd);
1429 dbg("%s (%d) TIOCSERGETLSR", __func__, port->number);
1430 return get_lsr_info(tty, mos7720_port,
1431 (unsigned int __user *)arg);
1434 /* FIXME: These should be using the mode methods */
1437 dbg("%s (%d) TIOCMSET/TIOCMBIC/TIOCMSET",
1438 __func__, port->number);
1439 return set_modem_info(mos7720_port, cmd,
1440 (unsigned int __user *)arg);
1443 dbg("%s (%d) TIOCGSERIAL", __func__, port->number);
1444 return get_serial_info(mos7720_port,
1445 (struct serial_struct __user *)arg);
1448 dbg("%s (%d) TIOCMIWAIT", __func__, port->number);
1449 cprev = mos7720_port->icount;
1451 if (signal_pending(current))
1452 return -ERESTARTSYS;
1453 cnow = mos7720_port->icount;
1454 if (cnow.rng == cprev.rng && cnow.dsr == cprev.dsr &&
1455 cnow.dcd == cprev.dcd && cnow.cts == cprev.cts)
1456 return -EIO; /* no change => error */
1457 if (((arg & TIOCM_RNG) && (cnow.rng != cprev.rng)) ||
1458 ((arg & TIOCM_DSR) && (cnow.dsr != cprev.dsr)) ||
1459 ((arg & TIOCM_CD) && (cnow.dcd != cprev.dcd)) ||
1460 ((arg & TIOCM_CTS) && (cnow.cts != cprev.cts))) {
1469 cnow = mos7720_port->icount;
1470 icount.cts = cnow.cts;
1471 icount.dsr = cnow.dsr;
1472 icount.rng = cnow.rng;
1473 icount.dcd = cnow.dcd;
1474 icount.rx = cnow.rx;
1475 icount.tx = cnow.tx;
1476 icount.frame = cnow.frame;
1477 icount.overrun = cnow.overrun;
1478 icount.parity = cnow.parity;
1479 icount.brk = cnow.brk;
1480 icount.buf_overrun = cnow.buf_overrun;
1482 dbg("%s (%d) TIOCGICOUNT RX=%d, TX=%d", __func__,
1483 port->number, icount.rx, icount.tx);
1484 if (copy_to_user((void __user *)arg, &icount, sizeof(icount)))
1489 return -ENOIOCTLCMD;
1492 static int mos7720_startup(struct usb_serial *serial)
1494 struct moschip_serial *mos7720_serial;
1495 struct moschip_port *mos7720_port;
1496 struct usb_device *dev;
1500 dbg("%s: Entering ..........", __func__);
1503 dbg("Invalid Handler");
1509 /* create our private serial structure */
1510 mos7720_serial = kzalloc(sizeof(struct moschip_serial), GFP_KERNEL);
1511 if (mos7720_serial == NULL) {
1512 dev_err(&dev->dev, "%s - Out of memory\n", __func__);
1516 usb_set_serial_data(serial, mos7720_serial);
1518 /* we set up the pointers to the endpoints in the mos7720_open *
1519 * function, as the structures aren't created yet. */
1521 /* set up port private structures */
1522 for (i = 0; i < serial->num_ports; ++i) {
1523 mos7720_port = kzalloc(sizeof(struct moschip_port), GFP_KERNEL);
1524 if (mos7720_port == NULL) {
1525 dev_err(&dev->dev, "%s - Out of memory\n", __func__);
1526 usb_set_serial_data(serial, NULL);
1527 kfree(mos7720_serial);
1531 /* Initialize all port interrupt end point to port 0 int
1532 * endpoint. Our device has only one interrupt endpoint
1533 * comman to all ports */
1534 serial->port[i]->interrupt_in_endpointAddress =
1535 serial->port[0]->interrupt_in_endpointAddress;
1537 mos7720_port->port = serial->port[i];
1538 usb_set_serial_port_data(serial->port[i], mos7720_port);
1540 dbg("port number is %d", serial->port[i]->number);
1541 dbg("serial number is %d", serial->minor);
1545 /* setting configuration feature to one */
1546 usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0),
1547 (__u8)0x03, 0x00, 0x01, 0x00, NULL, 0x00, 5*HZ);
1549 /* LSR For Port 1 */
1550 send_mos_cmd(serial, MOS_READ, 0x00, UART_LSR, &data);
1551 dbg("LSR:%x", data);
1553 /* LSR For Port 2 */
1554 send_mos_cmd(serial, MOS_READ, 0x01, UART_LSR, &data);
1555 dbg("LSR:%x", data);
1560 static void mos7720_release(struct usb_serial *serial)
1564 /* free private structure allocated for serial port */
1565 for (i = 0; i < serial->num_ports; ++i)
1566 kfree(usb_get_serial_port_data(serial->port[i]));
1568 /* free private structure allocated for serial device */
1569 kfree(usb_get_serial_data(serial));
1572 static struct usb_driver usb_driver = {
1573 .name = "moschip7720",
1574 .probe = usb_serial_probe,
1575 .disconnect = usb_serial_disconnect,
1576 .id_table = moschip_port_id_table,
1580 static struct usb_serial_driver moschip7720_2port_driver = {
1582 .owner = THIS_MODULE,
1583 .name = "moschip7720",
1585 .description = "Moschip 2 port adapter",
1586 .usb_driver = &usb_driver,
1587 .id_table = moschip_port_id_table,
1589 .open = mos7720_open,
1590 .close = mos7720_close,
1591 .throttle = mos7720_throttle,
1592 .unthrottle = mos7720_unthrottle,
1593 .attach = mos7720_startup,
1594 .release = mos7720_release,
1595 .ioctl = mos7720_ioctl,
1596 .tiocmget = mos7720_tiocmget,
1597 .tiocmset = mos7720_tiocmset,
1598 .set_termios = mos7720_set_termios,
1599 .write = mos7720_write,
1600 .write_room = mos7720_write_room,
1601 .chars_in_buffer = mos7720_chars_in_buffer,
1602 .break_ctl = mos7720_break,
1603 .read_bulk_callback = mos7720_bulk_in_callback,
1604 .read_int_callback = mos7720_interrupt_callback,
1607 static int __init moschip7720_init(void)
1611 dbg("%s: Entering ..........", __func__);
1613 /* Register with the usb serial */
1614 retval = usb_serial_register(&moschip7720_2port_driver);
1616 goto failed_port_device_register;
1618 printk(KERN_INFO KBUILD_MODNAME ": " DRIVER_VERSION ":"
1621 /* Register with the usb */
1622 retval = usb_register(&usb_driver);
1624 goto failed_usb_register;
1628 failed_usb_register:
1629 usb_serial_deregister(&moschip7720_2port_driver);
1631 failed_port_device_register:
1635 static void __exit moschip7720_exit(void)
1637 usb_deregister(&usb_driver);
1638 usb_serial_deregister(&moschip7720_2port_driver);
1641 module_init(moschip7720_init);
1642 module_exit(moschip7720_exit);
1644 /* Module information */
1645 MODULE_AUTHOR(DRIVER_AUTHOR);
1646 MODULE_DESCRIPTION(DRIVER_DESC);
1647 MODULE_LICENSE("GPL");
1649 module_param(debug, bool, S_IRUGO | S_IWUSR);
1650 MODULE_PARM_DESC(debug, "Debug enabled or not");