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>
37 #include <linux/parport.h>
39 #define DRIVER_AUTHOR "Aspire Communications pvt Ltd."
40 #define DRIVER_DESC "Moschip USB Serial Driver"
42 /* default urb timeout */
43 #define MOS_WDR_TIMEOUT 5000
45 #define MOS_MAX_PORT 0x02
46 #define MOS_WRITE 0x0E
49 /* Interrupt Rotinue Defines */
50 #define SERIAL_IIR_RLS 0x06
51 #define SERIAL_IIR_RDA 0x04
52 #define SERIAL_IIR_CTI 0x0c
53 #define SERIAL_IIR_THR 0x02
54 #define SERIAL_IIR_MS 0x00
56 #define NUM_URBS 16 /* URB Count */
57 #define URB_TRANSFER_BUFFER_SIZE 32 /* URB Size */
59 /* This structure holds all of the local serial port information */
61 __u8 shadowLCR; /* last LCR value received */
62 __u8 shadowMCR; /* last MCR value received */
63 __u8 shadowMSR; /* last MSR value received */
65 struct usb_serial_port *port; /* loop back to the owner */
66 struct urb *write_urb_pool[NUM_URBS];
69 static struct usb_serial_driver moschip7720_2port_driver;
71 #define USB_VENDOR_ID_MOSCHIP 0x9710
72 #define MOSCHIP_DEVICE_ID_7720 0x7720
73 #define MOSCHIP_DEVICE_ID_7715 0x7715
75 static const struct usb_device_id id_table[] = {
76 { USB_DEVICE(USB_VENDOR_ID_MOSCHIP, MOSCHIP_DEVICE_ID_7720) },
77 { USB_DEVICE(USB_VENDOR_ID_MOSCHIP, MOSCHIP_DEVICE_ID_7715) },
78 { } /* terminating entry */
80 MODULE_DEVICE_TABLE(usb, id_table);
82 #ifdef CONFIG_USB_SERIAL_MOS7715_PARPORT
84 /* initial values for parport regs */
85 #define DCR_INIT_VAL 0x0c /* SLCTIN, nINIT */
86 #define ECR_INIT_VAL 0x00 /* SPP mode */
89 struct mos7715_parport *mos_parport;
90 struct list_head urblist_entry;
91 struct kref ref_count;
95 enum mos7715_pp_modes {
97 PS2 = 1<<5, /* moschip calls this 'NIBBLE' mode */
98 PPF = 2<<5, /* moschip calls this 'CB-FIFO mode */
101 struct mos7715_parport {
102 struct parport *pp; /* back to containing struct */
103 struct kref ref_count; /* to instance of this struct */
104 struct list_head deferred_urbs; /* list deferred async urbs */
105 struct list_head active_urbs; /* list async urbs in flight */
106 spinlock_t listlock; /* protects list access */
107 bool msg_pending; /* usb sync call pending */
108 struct completion syncmsg_compl; /* usb sync call completed */
109 struct tasklet_struct urb_tasklet; /* for sending deferred urbs */
110 struct usb_serial *serial; /* back to containing struct */
111 __u8 shadowECR; /* parallel port regs... */
113 atomic_t shadowDSR; /* updated in int-in callback */
116 /* lock guards against dereferencing NULL ptr in parport ops callbacks */
117 static DEFINE_SPINLOCK(release_lock);
119 #endif /* CONFIG_USB_SERIAL_MOS7715_PARPORT */
121 static const unsigned int dummy; /* for clarity in register access fns */
124 THR, /* serial port regs */
136 DPR, /* parallel port regs */
140 SP1_REG, /* device control regs */
141 SP2_REG, /* serial port 2 (7720 only) */
147 * Return the correct value for the Windex field of the setup packet
148 * for a control endpoint message. See the 7715 datasheet.
150 static inline __u16 get_reg_index(enum mos_regs reg)
152 static const __u16 mos7715_index_lookup_table[] = {
170 0x02, /* SP2_REG (7720 only) */
171 0x04, /* PP_REG (7715 only) */
172 0x08, /* SP_CONTROL_REG */
174 return mos7715_index_lookup_table[reg];
178 * Return the correct value for the upper byte of the Wvalue field of
179 * the setup packet for a control endpoint message.
181 static inline __u16 get_reg_value(enum mos_regs reg,
182 unsigned int serial_portnum)
184 if (reg >= SP1_REG) /* control reg */
187 else if (reg >= DPR) /* parallel port reg (7715 only) */
190 else /* serial port reg */
191 return (serial_portnum + 2) << 8;
195 * Write data byte to the specified device register. The data is embedded in
196 * the value field of the setup packet. serial_portnum is ignored for registers
197 * not specific to a particular serial port.
199 static int write_mos_reg(struct usb_serial *serial, unsigned int serial_portnum,
200 enum mos_regs reg, __u8 data)
202 struct usb_device *usbdev = serial->dev;
203 unsigned int pipe = usb_sndctrlpipe(usbdev, 0);
204 __u8 request = (__u8)0x0e;
205 __u8 requesttype = (__u8)0x40;
206 __u16 index = get_reg_index(reg);
207 __u16 value = get_reg_value(reg, serial_portnum) + data;
208 int status = usb_control_msg(usbdev, pipe, request, requesttype, value,
209 index, NULL, 0, MOS_WDR_TIMEOUT);
211 dev_err(&usbdev->dev,
212 "mos7720: usb_control_msg() failed: %d", status);
217 * Read data byte from the specified device register. The data returned by the
218 * device is embedded in the value field of the setup packet. serial_portnum is
219 * ignored for registers that are not specific to a particular serial port.
221 static int read_mos_reg(struct usb_serial *serial, unsigned int serial_portnum,
222 enum mos_regs reg, __u8 *data)
224 struct usb_device *usbdev = serial->dev;
225 unsigned int pipe = usb_rcvctrlpipe(usbdev, 0);
226 __u8 request = (__u8)0x0d;
227 __u8 requesttype = (__u8)0xc0;
228 __u16 index = get_reg_index(reg);
229 __u16 value = get_reg_value(reg, serial_portnum);
233 buf = kmalloc(1, GFP_KERNEL);
237 status = usb_control_msg(usbdev, pipe, request, requesttype, value,
238 index, buf, 1, MOS_WDR_TIMEOUT);
242 dev_err(&usbdev->dev,
243 "mos7720: usb_control_msg() failed: %d", status);
249 #ifdef CONFIG_USB_SERIAL_MOS7715_PARPORT
251 static inline int mos7715_change_mode(struct mos7715_parport *mos_parport,
252 enum mos7715_pp_modes mode)
254 mos_parport->shadowECR = mode;
255 write_mos_reg(mos_parport->serial, dummy, ECR, mos_parport->shadowECR);
259 static void destroy_mos_parport(struct kref *kref)
261 struct mos7715_parport *mos_parport =
262 container_of(kref, struct mos7715_parport, ref_count);
267 static void destroy_urbtracker(struct kref *kref)
269 struct urbtracker *urbtrack =
270 container_of(kref, struct urbtracker, ref_count);
271 struct mos7715_parport *mos_parport = urbtrack->mos_parport;
273 usb_free_urb(urbtrack->urb);
275 kref_put(&mos_parport->ref_count, destroy_mos_parport);
279 * This runs as a tasklet when sending an urb in a non-blocking parallel
280 * port callback had to be deferred because the disconnect mutex could not be
281 * obtained at the time.
283 static void send_deferred_urbs(unsigned long _mos_parport)
287 struct mos7715_parport *mos_parport = (void *)_mos_parport;
288 struct urbtracker *urbtrack, *tmp;
289 struct list_head *cursor, *next;
292 /* if release function ran, game over */
293 if (unlikely(mos_parport->serial == NULL))
296 dev = &mos_parport->serial->dev->dev;
298 /* try again to get the mutex */
299 if (!mutex_trylock(&mos_parport->serial->disc_mutex)) {
300 dev_dbg(dev, "%s: rescheduling tasklet\n", __func__);
301 tasklet_schedule(&mos_parport->urb_tasklet);
305 /* if device disconnected, game over */
306 if (unlikely(mos_parport->serial->disconnected)) {
307 mutex_unlock(&mos_parport->serial->disc_mutex);
311 spin_lock_irqsave(&mos_parport->listlock, flags);
312 if (list_empty(&mos_parport->deferred_urbs)) {
313 spin_unlock_irqrestore(&mos_parport->listlock, flags);
314 mutex_unlock(&mos_parport->serial->disc_mutex);
315 dev_dbg(dev, "%s: deferred_urbs list empty\n", __func__);
319 /* move contents of deferred_urbs list to active_urbs list and submit */
320 list_for_each_safe(cursor, next, &mos_parport->deferred_urbs)
321 list_move_tail(cursor, &mos_parport->active_urbs);
322 list_for_each_entry_safe(urbtrack, tmp, &mos_parport->active_urbs,
324 ret_val = usb_submit_urb(urbtrack->urb, GFP_ATOMIC);
325 dev_dbg(dev, "%s: urb submitted\n", __func__);
327 dev_err(dev, "usb_submit_urb() failed: %d\n", ret_val);
328 list_del(&urbtrack->urblist_entry);
329 kref_put(&urbtrack->ref_count, destroy_urbtracker);
332 spin_unlock_irqrestore(&mos_parport->listlock, flags);
333 mutex_unlock(&mos_parport->serial->disc_mutex);
336 /* callback for parallel port control urbs submitted asynchronously */
337 static void async_complete(struct urb *urb)
339 struct urbtracker *urbtrack = urb->context;
340 int status = urb->status;
342 if (unlikely(status))
343 dev_dbg(&urb->dev->dev, "%s - nonzero urb status received: %d\n", __func__, status);
345 /* remove the urbtracker from the active_urbs list */
346 spin_lock(&urbtrack->mos_parport->listlock);
347 list_del(&urbtrack->urblist_entry);
348 spin_unlock(&urbtrack->mos_parport->listlock);
349 kref_put(&urbtrack->ref_count, destroy_urbtracker);
352 static int write_parport_reg_nonblock(struct mos7715_parport *mos_parport,
353 enum mos_regs reg, __u8 data)
355 struct urbtracker *urbtrack;
358 struct usb_ctrlrequest setup;
359 struct usb_serial *serial = mos_parport->serial;
360 struct usb_device *usbdev = serial->dev;
362 /* create and initialize the control urb and containing urbtracker */
363 urbtrack = kmalloc(sizeof(struct urbtracker), GFP_ATOMIC);
364 if (urbtrack == NULL) {
365 dev_err(&usbdev->dev, "out of memory");
368 kref_get(&mos_parport->ref_count);
369 urbtrack->mos_parport = mos_parport;
370 urbtrack->urb = usb_alloc_urb(0, GFP_ATOMIC);
371 if (urbtrack->urb == NULL) {
372 dev_err(&usbdev->dev, "out of urbs");
376 setup.bRequestType = (__u8)0x40;
377 setup.bRequest = (__u8)0x0e;
378 setup.wValue = get_reg_value(reg, dummy);
379 setup.wIndex = get_reg_index(reg);
381 usb_fill_control_urb(urbtrack->urb, usbdev,
382 usb_sndctrlpipe(usbdev, 0),
383 (unsigned char *)&setup,
384 NULL, 0, async_complete, urbtrack);
385 kref_init(&urbtrack->ref_count);
386 INIT_LIST_HEAD(&urbtrack->urblist_entry);
389 * get the disconnect mutex, or add tracker to the deferred_urbs list
390 * and schedule a tasklet to try again later
392 if (!mutex_trylock(&serial->disc_mutex)) {
393 spin_lock_irqsave(&mos_parport->listlock, flags);
394 list_add_tail(&urbtrack->urblist_entry,
395 &mos_parport->deferred_urbs);
396 spin_unlock_irqrestore(&mos_parport->listlock, flags);
397 tasklet_schedule(&mos_parport->urb_tasklet);
398 dev_dbg(&usbdev->dev, "tasklet scheduled");
402 /* bail if device disconnected */
403 if (serial->disconnected) {
404 kref_put(&urbtrack->ref_count, destroy_urbtracker);
405 mutex_unlock(&serial->disc_mutex);
409 /* add the tracker to the active_urbs list and submit */
410 spin_lock_irqsave(&mos_parport->listlock, flags);
411 list_add_tail(&urbtrack->urblist_entry, &mos_parport->active_urbs);
412 spin_unlock_irqrestore(&mos_parport->listlock, flags);
413 ret_val = usb_submit_urb(urbtrack->urb, GFP_ATOMIC);
414 mutex_unlock(&serial->disc_mutex);
416 dev_err(&usbdev->dev,
417 "%s: submit_urb() failed: %d", __func__, ret_val);
418 spin_lock_irqsave(&mos_parport->listlock, flags);
419 list_del(&urbtrack->urblist_entry);
420 spin_unlock_irqrestore(&mos_parport->listlock, flags);
421 kref_put(&urbtrack->ref_count, destroy_urbtracker);
428 * This is the the common top part of all parallel port callback operations that
429 * send synchronous messages to the device. This implements convoluted locking
430 * that avoids two scenarios: (1) a port operation is called after usbserial
431 * has called our release function, at which point struct mos7715_parport has
432 * been destroyed, and (2) the device has been disconnected, but usbserial has
433 * not called the release function yet because someone has a serial port open.
434 * The shared release_lock prevents the first, and the mutex and disconnected
435 * flag maintained by usbserial covers the second. We also use the msg_pending
436 * flag to ensure that all synchronous usb messgage calls have completed before
437 * our release function can return.
439 static int parport_prologue(struct parport *pp)
441 struct mos7715_parport *mos_parport;
443 spin_lock(&release_lock);
444 mos_parport = pp->private_data;
445 if (unlikely(mos_parport == NULL)) {
446 /* release fn called, port struct destroyed */
447 spin_unlock(&release_lock);
450 mos_parport->msg_pending = true; /* synch usb call pending */
451 INIT_COMPLETION(mos_parport->syncmsg_compl);
452 spin_unlock(&release_lock);
454 mutex_lock(&mos_parport->serial->disc_mutex);
455 if (mos_parport->serial->disconnected) {
456 /* device disconnected */
457 mutex_unlock(&mos_parport->serial->disc_mutex);
458 mos_parport->msg_pending = false;
459 complete(&mos_parport->syncmsg_compl);
467 * This is the the common bottom part of all parallel port functions that send
468 * synchronous messages to the device.
470 static inline void parport_epilogue(struct parport *pp)
472 struct mos7715_parport *mos_parport = pp->private_data;
473 mutex_unlock(&mos_parport->serial->disc_mutex);
474 mos_parport->msg_pending = false;
475 complete(&mos_parport->syncmsg_compl);
478 static void parport_mos7715_write_data(struct parport *pp, unsigned char d)
480 struct mos7715_parport *mos_parport = pp->private_data;
482 if (parport_prologue(pp) < 0)
484 mos7715_change_mode(mos_parport, SPP);
485 write_mos_reg(mos_parport->serial, dummy, DPR, (__u8)d);
486 parport_epilogue(pp);
489 static unsigned char parport_mos7715_read_data(struct parport *pp)
491 struct mos7715_parport *mos_parport = pp->private_data;
494 if (parport_prologue(pp) < 0)
496 read_mos_reg(mos_parport->serial, dummy, DPR, &d);
497 parport_epilogue(pp);
501 static void parport_mos7715_write_control(struct parport *pp, unsigned char d)
503 struct mos7715_parport *mos_parport = pp->private_data;
506 if (parport_prologue(pp) < 0)
508 data = ((__u8)d & 0x0f) | (mos_parport->shadowDCR & 0xf0);
509 write_mos_reg(mos_parport->serial, dummy, DCR, data);
510 mos_parport->shadowDCR = data;
511 parport_epilogue(pp);
514 static unsigned char parport_mos7715_read_control(struct parport *pp)
516 struct mos7715_parport *mos_parport = pp->private_data;
519 spin_lock(&release_lock);
520 mos_parport = pp->private_data;
521 if (unlikely(mos_parport == NULL)) {
522 spin_unlock(&release_lock);
525 dcr = mos_parport->shadowDCR & 0x0f;
526 spin_unlock(&release_lock);
530 static unsigned char parport_mos7715_frob_control(struct parport *pp,
534 struct mos7715_parport *mos_parport = pp->private_data;
539 if (parport_prologue(pp) < 0)
541 mos_parport->shadowDCR = (mos_parport->shadowDCR & (~mask)) ^ val;
542 write_mos_reg(mos_parport->serial, dummy, DCR, mos_parport->shadowDCR);
543 dcr = mos_parport->shadowDCR & 0x0f;
544 parport_epilogue(pp);
548 static unsigned char parport_mos7715_read_status(struct parport *pp)
550 unsigned char status;
551 struct mos7715_parport *mos_parport = pp->private_data;
553 spin_lock(&release_lock);
554 mos_parport = pp->private_data;
555 if (unlikely(mos_parport == NULL)) { /* release called */
556 spin_unlock(&release_lock);
559 status = atomic_read(&mos_parport->shadowDSR) & 0xf8;
560 spin_unlock(&release_lock);
564 static void parport_mos7715_enable_irq(struct parport *pp)
568 static void parport_mos7715_disable_irq(struct parport *pp)
572 static void parport_mos7715_data_forward(struct parport *pp)
574 struct mos7715_parport *mos_parport = pp->private_data;
576 if (parport_prologue(pp) < 0)
578 mos7715_change_mode(mos_parport, PS2);
579 mos_parport->shadowDCR &= ~0x20;
580 write_mos_reg(mos_parport->serial, dummy, DCR, mos_parport->shadowDCR);
581 parport_epilogue(pp);
584 static void parport_mos7715_data_reverse(struct parport *pp)
586 struct mos7715_parport *mos_parport = pp->private_data;
588 if (parport_prologue(pp) < 0)
590 mos7715_change_mode(mos_parport, PS2);
591 mos_parport->shadowDCR |= 0x20;
592 write_mos_reg(mos_parport->serial, dummy, DCR, mos_parport->shadowDCR);
593 parport_epilogue(pp);
596 static void parport_mos7715_init_state(struct pardevice *dev,
597 struct parport_state *s)
599 s->u.pc.ctr = DCR_INIT_VAL;
600 s->u.pc.ecr = ECR_INIT_VAL;
603 /* N.B. Parport core code requires that this function not block */
604 static void parport_mos7715_save_state(struct parport *pp,
605 struct parport_state *s)
607 struct mos7715_parport *mos_parport;
609 spin_lock(&release_lock);
610 mos_parport = pp->private_data;
611 if (unlikely(mos_parport == NULL)) { /* release called */
612 spin_unlock(&release_lock);
615 s->u.pc.ctr = mos_parport->shadowDCR;
616 s->u.pc.ecr = mos_parport->shadowECR;
617 spin_unlock(&release_lock);
620 /* N.B. Parport core code requires that this function not block */
621 static void parport_mos7715_restore_state(struct parport *pp,
622 struct parport_state *s)
624 struct mos7715_parport *mos_parport;
626 spin_lock(&release_lock);
627 mos_parport = pp->private_data;
628 if (unlikely(mos_parport == NULL)) { /* release called */
629 spin_unlock(&release_lock);
632 write_parport_reg_nonblock(mos_parport, DCR, mos_parport->shadowDCR);
633 write_parport_reg_nonblock(mos_parport, ECR, mos_parport->shadowECR);
634 spin_unlock(&release_lock);
637 static size_t parport_mos7715_write_compat(struct parport *pp,
639 size_t len, int flags)
642 struct mos7715_parport *mos_parport = pp->private_data;
645 if (parport_prologue(pp) < 0)
647 mos7715_change_mode(mos_parport, PPF);
648 retval = usb_bulk_msg(mos_parport->serial->dev,
649 usb_sndbulkpipe(mos_parport->serial->dev, 2),
650 (void *)buffer, len, &actual_len,
652 parport_epilogue(pp);
654 dev_err(&mos_parport->serial->dev->dev,
655 "mos7720: usb_bulk_msg() failed: %d", retval);
661 static struct parport_operations parport_mos7715_ops = {
662 .owner = THIS_MODULE,
663 .write_data = parport_mos7715_write_data,
664 .read_data = parport_mos7715_read_data,
666 .write_control = parport_mos7715_write_control,
667 .read_control = parport_mos7715_read_control,
668 .frob_control = parport_mos7715_frob_control,
670 .read_status = parport_mos7715_read_status,
672 .enable_irq = parport_mos7715_enable_irq,
673 .disable_irq = parport_mos7715_disable_irq,
675 .data_forward = parport_mos7715_data_forward,
676 .data_reverse = parport_mos7715_data_reverse,
678 .init_state = parport_mos7715_init_state,
679 .save_state = parport_mos7715_save_state,
680 .restore_state = parport_mos7715_restore_state,
682 .compat_write_data = parport_mos7715_write_compat,
684 .nibble_read_data = parport_ieee1284_read_nibble,
685 .byte_read_data = parport_ieee1284_read_byte,
689 * Allocate and initialize parallel port control struct, initialize
690 * the parallel port hardware device, and register with the parport subsystem.
692 static int mos7715_parport_init(struct usb_serial *serial)
694 struct mos7715_parport *mos_parport;
696 /* allocate and initialize parallel port control struct */
697 mos_parport = kzalloc(sizeof(struct mos7715_parport), GFP_KERNEL);
698 if (mos_parport == NULL) {
699 dev_dbg(&serial->dev->dev, "%s: kzalloc failed\n", __func__);
702 mos_parport->msg_pending = false;
703 kref_init(&mos_parport->ref_count);
704 spin_lock_init(&mos_parport->listlock);
705 INIT_LIST_HEAD(&mos_parport->active_urbs);
706 INIT_LIST_HEAD(&mos_parport->deferred_urbs);
707 usb_set_serial_data(serial, mos_parport); /* hijack private pointer */
708 mos_parport->serial = serial;
709 tasklet_init(&mos_parport->urb_tasklet, send_deferred_urbs,
710 (unsigned long) mos_parport);
711 init_completion(&mos_parport->syncmsg_compl);
713 /* cycle parallel port reset bit */
714 write_mos_reg(mos_parport->serial, dummy, PP_REG, (__u8)0x80);
715 write_mos_reg(mos_parport->serial, dummy, PP_REG, (__u8)0x00);
717 /* initialize device registers */
718 mos_parport->shadowDCR = DCR_INIT_VAL;
719 write_mos_reg(mos_parport->serial, dummy, DCR, mos_parport->shadowDCR);
720 mos_parport->shadowECR = ECR_INIT_VAL;
721 write_mos_reg(mos_parport->serial, dummy, ECR, mos_parport->shadowECR);
723 /* register with parport core */
724 mos_parport->pp = parport_register_port(0, PARPORT_IRQ_NONE,
726 &parport_mos7715_ops);
727 if (mos_parport->pp == NULL) {
728 dev_err(&serial->interface->dev,
729 "Could not register parport\n");
730 kref_put(&mos_parport->ref_count, destroy_mos_parport);
733 mos_parport->pp->private_data = mos_parport;
734 mos_parport->pp->modes = PARPORT_MODE_COMPAT | PARPORT_MODE_PCSPP;
735 mos_parport->pp->dev = &serial->interface->dev;
736 parport_announce_port(mos_parport->pp);
740 #endif /* CONFIG_USB_SERIAL_MOS7715_PARPORT */
743 * mos7720_interrupt_callback
744 * this is the callback function for when we have received data on the
745 * interrupt endpoint.
747 static void mos7720_interrupt_callback(struct urb *urb)
751 int status = urb->status;
752 struct device *dev = &urb->dev->dev;
764 /* this urb is terminated, clean up */
765 dev_dbg(dev, "%s - urb shutting down with status: %d\n", __func__, status);
768 dev_dbg(dev, "%s - nonzero urb status received: %d\n", __func__, status);
772 length = urb->actual_length;
773 data = urb->transfer_buffer;
775 /* Moschip get 4 bytes
776 * Byte 1 IIR Port 1 (port.number is 0)
777 * Byte 2 IIR Port 2 (port.number is 1)
778 * Byte 3 --------------
779 * Byte 4 FIFO status for both */
781 /* the above description is inverted
782 * oneukum 2007-03-14 */
784 if (unlikely(length != 4)) {
785 dev_dbg(dev, "Wrong data !!!\n");
792 if ((sp1 | sp2) & 0x01) {
793 /* No Interrupt Pending in both the ports */
794 dev_dbg(dev, "No Interrupt !!!\n");
796 switch (sp1 & 0x0f) {
798 dev_dbg(dev, "Serial Port 1: Receiver status error or address bit detected in 9-bit mode\n");
801 dev_dbg(dev, "Serial Port 1: Receiver time out\n");
804 /* dev_dbg(dev, "Serial Port 1: Modem status change\n"); */
808 switch (sp2 & 0x0f) {
810 dev_dbg(dev, "Serial Port 2: Receiver status error or address bit detected in 9-bit mode\n");
813 dev_dbg(dev, "Serial Port 2: Receiver time out\n");
816 /* dev_dbg(dev, "Serial Port 2: Modem status change\n"); */
822 result = usb_submit_urb(urb, GFP_ATOMIC);
824 dev_err(dev, "%s - Error %d submitting control urb\n", __func__, result);
828 * mos7715_interrupt_callback
829 * this is the 7715's callback function for when we have received data on
830 * the interrupt endpoint.
832 static void mos7715_interrupt_callback(struct urb *urb)
836 int status = urb->status;
837 struct device *dev = &urb->dev->dev;
849 /* this urb is terminated, clean up */
850 dev_dbg(dev, "%s - urb shutting down with status: %d\n", __func__, status);
853 dev_dbg(dev, "%s - nonzero urb status received: %d\n", __func__, status);
857 length = urb->actual_length;
858 data = urb->transfer_buffer;
860 /* Structure of data from 7715 device:
861 * Byte 1: IIR serial Port
863 * Byte 2: DSR parallel port
864 * Byte 4: FIFO status for both */
866 if (unlikely(length != 4)) {
867 dev_dbg(dev, "Wrong data !!!\n");
872 if (!(iir & 0x01)) { /* serial port interrupt pending */
873 switch (iir & 0x0f) {
875 dev_dbg(dev, "Serial Port: Receiver status error or address bit detected in 9-bit mode\n\n");
878 dev_dbg(dev, "Serial Port: Receiver time out\n");
881 /* dev_dbg(dev, "Serial Port: Modem status change\n"); */
886 #ifdef CONFIG_USB_SERIAL_MOS7715_PARPORT
887 { /* update local copy of DSR reg */
888 struct usb_serial_port *port = urb->context;
889 struct mos7715_parport *mos_parport = port->serial->private;
890 if (unlikely(mos_parport == NULL))
892 atomic_set(&mos_parport->shadowDSR, data[2]);
897 result = usb_submit_urb(urb, GFP_ATOMIC);
899 dev_err(dev, "%s - Error %d submitting control urb\n", __func__, result);
903 * mos7720_bulk_in_callback
904 * this is the callback function for when we have received data on the
907 static void mos7720_bulk_in_callback(struct urb *urb)
910 unsigned char *data ;
911 struct usb_serial_port *port;
912 int status = urb->status;
915 dev_dbg(&urb->dev->dev, "nonzero read bulk status received: %d\n", status);
921 dev_dbg(&port->dev, "Entering...%s\n", __func__);
923 data = urb->transfer_buffer;
925 if (urb->actual_length) {
926 tty_insert_flip_string(&port->port, data, urb->actual_length);
927 tty_flip_buffer_push(&port->port);
930 if (port->read_urb->status != -EINPROGRESS) {
931 retval = usb_submit_urb(port->read_urb, GFP_ATOMIC);
933 dev_dbg(&port->dev, "usb_submit_urb(read bulk) failed, retval = %d\n", retval);
938 * mos7720_bulk_out_data_callback
939 * this is the callback function for when we have finished sending serial
940 * data on the bulk out endpoint.
942 static void mos7720_bulk_out_data_callback(struct urb *urb)
944 struct moschip_port *mos7720_port;
945 int status = urb->status;
948 dev_dbg(&urb->dev->dev, "nonzero write bulk status received:%d\n", status);
952 mos7720_port = urb->context;
954 dev_dbg(&urb->dev->dev, "NULL mos7720_port pointer\n");
958 if (mos7720_port->open)
959 tty_port_tty_wakeup(&mos7720_port->port->port);
964 * this function installs the appropriate read interrupt endpoint callback
965 * depending on whether the device is a 7720 or 7715, thus avoiding costly
966 * run-time checks in the high-frequency callback routine itself.
968 static int mos77xx_probe(struct usb_serial *serial,
969 const struct usb_device_id *id)
971 if (id->idProduct == MOSCHIP_DEVICE_ID_7715)
972 moschip7720_2port_driver.read_int_callback =
973 mos7715_interrupt_callback;
975 moschip7720_2port_driver.read_int_callback =
976 mos7720_interrupt_callback;
981 static int mos77xx_calc_num_ports(struct usb_serial *serial)
983 u16 product = le16_to_cpu(serial->dev->descriptor.idProduct);
984 if (product == MOSCHIP_DEVICE_ID_7715)
990 static int mos7720_open(struct tty_struct *tty, struct usb_serial_port *port)
992 struct usb_serial *serial;
994 struct moschip_port *mos7720_port;
998 int allocated_urbs = 0;
1001 serial = port->serial;
1003 mos7720_port = usb_get_serial_port_data(port);
1004 if (mos7720_port == NULL)
1007 usb_clear_halt(serial->dev, port->write_urb->pipe);
1008 usb_clear_halt(serial->dev, port->read_urb->pipe);
1010 /* Initialising the write urb pool */
1011 for (j = 0; j < NUM_URBS; ++j) {
1012 urb = usb_alloc_urb(0, GFP_KERNEL);
1013 mos7720_port->write_urb_pool[j] = urb;
1016 dev_err(&port->dev, "No more urbs???\n");
1020 urb->transfer_buffer = kmalloc(URB_TRANSFER_BUFFER_SIZE,
1022 if (!urb->transfer_buffer) {
1024 "%s-out of memory for urb buffers.\n",
1026 usb_free_urb(mos7720_port->write_urb_pool[j]);
1027 mos7720_port->write_urb_pool[j] = NULL;
1033 if (!allocated_urbs)
1036 /* Initialize MCS7720 -- Write Init values to corresponding Registers
1048 * 0x08 : SP1/2 Control Reg
1050 port_number = port->number - port->serial->minor;
1051 read_mos_reg(serial, port_number, LSR, &data);
1053 dev_dbg(&port->dev, "SS::%p LSR:%x\n", mos7720_port, data);
1055 write_mos_reg(serial, dummy, SP1_REG, 0x02);
1056 write_mos_reg(serial, dummy, SP2_REG, 0x02);
1058 write_mos_reg(serial, port_number, IER, 0x00);
1059 write_mos_reg(serial, port_number, FCR, 0x00);
1061 write_mos_reg(serial, port_number, FCR, 0xcf);
1062 mos7720_port->shadowLCR = 0x03;
1063 write_mos_reg(serial, port_number, LCR, mos7720_port->shadowLCR);
1064 mos7720_port->shadowMCR = 0x0b;
1065 write_mos_reg(serial, port_number, MCR, mos7720_port->shadowMCR);
1067 write_mos_reg(serial, port_number, SP_CONTROL_REG, 0x00);
1068 read_mos_reg(serial, dummy, SP_CONTROL_REG, &data);
1069 data = data | (port->number - port->serial->minor + 1);
1070 write_mos_reg(serial, dummy, SP_CONTROL_REG, data);
1071 mos7720_port->shadowLCR = 0x83;
1072 write_mos_reg(serial, port_number, LCR, mos7720_port->shadowLCR);
1073 write_mos_reg(serial, port_number, THR, 0x0c);
1074 write_mos_reg(serial, port_number, IER, 0x00);
1075 mos7720_port->shadowLCR = 0x03;
1076 write_mos_reg(serial, port_number, LCR, mos7720_port->shadowLCR);
1077 write_mos_reg(serial, port_number, IER, 0x0c);
1079 response = usb_submit_urb(port->read_urb, GFP_KERNEL);
1081 dev_err(&port->dev, "%s - Error %d submitting read urb\n",
1082 __func__, response);
1084 /* initialize our port settings */
1085 mos7720_port->shadowMCR = UART_MCR_OUT2; /* Must set to enable ints! */
1087 /* send a open port command */
1088 mos7720_port->open = 1;
1094 * mos7720_chars_in_buffer
1095 * this function is called by the tty driver when it wants to know how many
1096 * bytes of data we currently have outstanding in the port (data that has
1097 * been written, but hasn't made it out the port yet)
1098 * If successful, we return the number of bytes left to be written in the
1100 * Otherwise we return a negative error number.
1102 static int mos7720_chars_in_buffer(struct tty_struct *tty)
1104 struct usb_serial_port *port = tty->driver_data;
1107 struct moschip_port *mos7720_port;
1109 mos7720_port = usb_get_serial_port_data(port);
1110 if (mos7720_port == NULL)
1113 for (i = 0; i < NUM_URBS; ++i) {
1114 if (mos7720_port->write_urb_pool[i] &&
1115 mos7720_port->write_urb_pool[i]->status == -EINPROGRESS)
1116 chars += URB_TRANSFER_BUFFER_SIZE;
1118 dev_dbg(&port->dev, "%s - returns %d\n", __func__, chars);
1122 static void mos7720_close(struct usb_serial_port *port)
1124 struct usb_serial *serial;
1125 struct moschip_port *mos7720_port;
1128 serial = port->serial;
1130 mos7720_port = usb_get_serial_port_data(port);
1131 if (mos7720_port == NULL)
1134 for (j = 0; j < NUM_URBS; ++j)
1135 usb_kill_urb(mos7720_port->write_urb_pool[j]);
1137 /* Freeing Write URBs */
1138 for (j = 0; j < NUM_URBS; ++j) {
1139 if (mos7720_port->write_urb_pool[j]) {
1140 kfree(mos7720_port->write_urb_pool[j]->transfer_buffer);
1141 usb_free_urb(mos7720_port->write_urb_pool[j]);
1145 /* While closing port, shutdown all bulk read, write *
1146 * and interrupt read if they exists, otherwise nop */
1147 usb_kill_urb(port->write_urb);
1148 usb_kill_urb(port->read_urb);
1150 write_mos_reg(serial, port->number - port->serial->minor, MCR, 0x00);
1151 write_mos_reg(serial, port->number - port->serial->minor, IER, 0x00);
1153 mos7720_port->open = 0;
1156 static void mos7720_break(struct tty_struct *tty, int break_state)
1158 struct usb_serial_port *port = tty->driver_data;
1160 struct usb_serial *serial;
1161 struct moschip_port *mos7720_port;
1163 serial = port->serial;
1165 mos7720_port = usb_get_serial_port_data(port);
1166 if (mos7720_port == NULL)
1169 if (break_state == -1)
1170 data = mos7720_port->shadowLCR | UART_LCR_SBC;
1172 data = mos7720_port->shadowLCR & ~UART_LCR_SBC;
1174 mos7720_port->shadowLCR = data;
1175 write_mos_reg(serial, port->number - port->serial->minor,
1176 LCR, mos7720_port->shadowLCR);
1180 * mos7720_write_room
1181 * this function is called by the tty driver when it wants to know how many
1182 * bytes of data we can accept for a specific port.
1183 * If successful, we return the amount of room that we have for this port
1184 * Otherwise we return a negative error number.
1186 static int mos7720_write_room(struct tty_struct *tty)
1188 struct usb_serial_port *port = tty->driver_data;
1189 struct moschip_port *mos7720_port;
1193 mos7720_port = usb_get_serial_port_data(port);
1194 if (mos7720_port == NULL)
1197 /* FIXME: Locking */
1198 for (i = 0; i < NUM_URBS; ++i) {
1199 if (mos7720_port->write_urb_pool[i] &&
1200 mos7720_port->write_urb_pool[i]->status != -EINPROGRESS)
1201 room += URB_TRANSFER_BUFFER_SIZE;
1204 dev_dbg(&port->dev, "%s - returns %d\n", __func__, room);
1208 static int mos7720_write(struct tty_struct *tty, struct usb_serial_port *port,
1209 const unsigned char *data, int count)
1216 struct moschip_port *mos7720_port;
1217 struct usb_serial *serial;
1219 const unsigned char *current_position = data;
1221 serial = port->serial;
1223 mos7720_port = usb_get_serial_port_data(port);
1224 if (mos7720_port == NULL)
1227 /* try to find a free urb in the list */
1230 for (i = 0; i < NUM_URBS; ++i) {
1231 if (mos7720_port->write_urb_pool[i] &&
1232 mos7720_port->write_urb_pool[i]->status != -EINPROGRESS) {
1233 urb = mos7720_port->write_urb_pool[i];
1234 dev_dbg(&port->dev, "URB:%d\n", i);
1240 dev_dbg(&port->dev, "%s - no more free urbs\n", __func__);
1244 if (urb->transfer_buffer == NULL) {
1245 urb->transfer_buffer = kmalloc(URB_TRANSFER_BUFFER_SIZE,
1247 if (urb->transfer_buffer == NULL) {
1248 dev_err_console(port, "%s no more kernel memory...\n",
1253 transfer_size = min(count, URB_TRANSFER_BUFFER_SIZE);
1255 memcpy(urb->transfer_buffer, current_position, transfer_size);
1256 usb_serial_debug_data(&port->dev, __func__, transfer_size,
1257 urb->transfer_buffer);
1259 /* fill urb with data and submit */
1260 usb_fill_bulk_urb(urb, serial->dev,
1261 usb_sndbulkpipe(serial->dev,
1262 port->bulk_out_endpointAddress),
1263 urb->transfer_buffer, transfer_size,
1264 mos7720_bulk_out_data_callback, mos7720_port);
1266 /* send it down the pipe */
1267 status = usb_submit_urb(urb, GFP_ATOMIC);
1269 dev_err_console(port, "%s - usb_submit_urb(write bulk) failed "
1270 "with status = %d\n", __func__, status);
1271 bytes_sent = status;
1274 bytes_sent = transfer_size;
1280 static void mos7720_throttle(struct tty_struct *tty)
1282 struct usb_serial_port *port = tty->driver_data;
1283 struct moschip_port *mos7720_port;
1286 mos7720_port = usb_get_serial_port_data(port);
1288 if (mos7720_port == NULL)
1291 if (!mos7720_port->open) {
1292 dev_dbg(&port->dev, "%s - port not opened\n", __func__);
1296 /* if we are implementing XON/XOFF, send the stop character */
1298 unsigned char stop_char = STOP_CHAR(tty);
1299 status = mos7720_write(tty, port, &stop_char, 1);
1304 /* if we are implementing RTS/CTS, toggle that line */
1305 if (tty->termios.c_cflag & CRTSCTS) {
1306 mos7720_port->shadowMCR &= ~UART_MCR_RTS;
1307 write_mos_reg(port->serial, port->number - port->serial->minor,
1308 MCR, mos7720_port->shadowMCR);
1314 static void mos7720_unthrottle(struct tty_struct *tty)
1316 struct usb_serial_port *port = tty->driver_data;
1317 struct moschip_port *mos7720_port = usb_get_serial_port_data(port);
1320 if (mos7720_port == NULL)
1323 if (!mos7720_port->open) {
1324 dev_dbg(&port->dev, "%s - port not opened\n", __func__);
1328 /* if we are implementing XON/XOFF, send the start character */
1330 unsigned char start_char = START_CHAR(tty);
1331 status = mos7720_write(tty, port, &start_char, 1);
1336 /* if we are implementing RTS/CTS, toggle that line */
1337 if (tty->termios.c_cflag & CRTSCTS) {
1338 mos7720_port->shadowMCR |= UART_MCR_RTS;
1339 write_mos_reg(port->serial, port->number - port->serial->minor,
1340 MCR, mos7720_port->shadowMCR);
1346 /* FIXME: this function does not work */
1347 static int set_higher_rates(struct moschip_port *mos7720_port,
1350 struct usb_serial_port *port;
1351 struct usb_serial *serial;
1353 enum mos_regs sp_reg;
1354 if (mos7720_port == NULL)
1357 port = mos7720_port->port;
1358 serial = port->serial;
1360 /***********************************************
1361 * Init Sequence for higher rates
1362 ***********************************************/
1363 dev_dbg(&port->dev, "Sending Setting Commands ..........\n");
1364 port_number = port->number - port->serial->minor;
1366 write_mos_reg(serial, port_number, IER, 0x00);
1367 write_mos_reg(serial, port_number, FCR, 0x00);
1368 write_mos_reg(serial, port_number, FCR, 0xcf);
1369 mos7720_port->shadowMCR = 0x0b;
1370 write_mos_reg(serial, port_number, MCR, mos7720_port->shadowMCR);
1371 write_mos_reg(serial, dummy, SP_CONTROL_REG, 0x00);
1373 /***********************************************
1374 * Set for higher rates *
1375 ***********************************************/
1376 /* writing baud rate verbatum into uart clock field clearly not right */
1377 if (port_number == 0)
1381 write_mos_reg(serial, dummy, sp_reg, baud * 0x10);
1382 write_mos_reg(serial, dummy, SP_CONTROL_REG, 0x03);
1383 mos7720_port->shadowMCR = 0x2b;
1384 write_mos_reg(serial, port_number, MCR, mos7720_port->shadowMCR);
1386 /***********************************************
1388 ***********************************************/
1389 mos7720_port->shadowLCR = mos7720_port->shadowLCR | UART_LCR_DLAB;
1390 write_mos_reg(serial, port_number, LCR, mos7720_port->shadowLCR);
1391 write_mos_reg(serial, port_number, DLL, 0x01);
1392 write_mos_reg(serial, port_number, DLM, 0x00);
1393 mos7720_port->shadowLCR = mos7720_port->shadowLCR & ~UART_LCR_DLAB;
1394 write_mos_reg(serial, port_number, LCR, mos7720_port->shadowLCR);
1399 /* baud rate information */
1400 struct divisor_table_entry {
1405 /* Define table of divisors for moschip 7720 hardware *
1406 * These assume a 3.6864MHz crystal, the standard /16, and *
1408 static struct divisor_table_entry divisor_table[] = {
1410 { 110, 1047}, /* 2094.545455 => 230450 => .0217 % over */
1411 { 134, 857}, /* 1713.011152 => 230398.5 => .00065% under */
1427 /*****************************************************************************
1428 * calc_baud_rate_divisor
1429 * this function calculates the proper baud rate divisor for the specified
1431 *****************************************************************************/
1432 static int calc_baud_rate_divisor(struct usb_serial_port *port, int baudrate, int *divisor)
1440 dev_dbg(&port->dev, "%s - %d\n", __func__, baudrate);
1442 for (i = 0; i < ARRAY_SIZE(divisor_table); i++) {
1443 if (divisor_table[i].baudrate == baudrate) {
1444 *divisor = divisor_table[i].divisor;
1449 /* After trying for all the standard baud rates *
1450 * Try calculating the divisor for this baud rate */
1451 if (baudrate > 75 && baudrate < 230400) {
1452 /* get the divisor */
1453 custom = (__u16)(230400L / baudrate);
1455 /* Check for round off */
1456 round1 = (__u16)(2304000L / baudrate);
1457 round = (__u16)(round1 - (custom * 10));
1462 dev_dbg(&port->dev, "Baud %d = %d\n", baudrate, custom);
1466 dev_dbg(&port->dev, "Baud calculation Failed...\n");
1471 * send_cmd_write_baud_rate
1472 * this function sends the proper command to change the baud rate of the
1475 static int send_cmd_write_baud_rate(struct moschip_port *mos7720_port,
1478 struct usb_serial_port *port;
1479 struct usb_serial *serial;
1482 unsigned char number;
1484 if (mos7720_port == NULL)
1487 port = mos7720_port->port;
1488 serial = port->serial;
1490 number = port->number - port->serial->minor;
1491 dev_dbg(&port->dev, "%s - baud = %d\n", __func__, baudrate);
1493 /* Calculate the Divisor */
1494 status = calc_baud_rate_divisor(port, baudrate, &divisor);
1496 dev_err(&port->dev, "%s - bad baud rate\n", __func__);
1500 /* Enable access to divisor latch */
1501 mos7720_port->shadowLCR = mos7720_port->shadowLCR | UART_LCR_DLAB;
1502 write_mos_reg(serial, number, LCR, mos7720_port->shadowLCR);
1504 /* Write the divisor */
1505 write_mos_reg(serial, number, DLL, (__u8)(divisor & 0xff));
1506 write_mos_reg(serial, number, DLM, (__u8)((divisor & 0xff00) >> 8));
1508 /* Disable access to divisor latch */
1509 mos7720_port->shadowLCR = mos7720_port->shadowLCR & ~UART_LCR_DLAB;
1510 write_mos_reg(serial, number, LCR, mos7720_port->shadowLCR);
1516 * change_port_settings
1517 * This routine is called to set the UART on the device to match
1518 * the specified new settings.
1520 static void change_port_settings(struct tty_struct *tty,
1521 struct moschip_port *mos7720_port,
1522 struct ktermios *old_termios)
1524 struct usb_serial_port *port;
1525 struct usb_serial *serial;
1536 if (mos7720_port == NULL)
1539 port = mos7720_port->port;
1540 serial = port->serial;
1541 port_number = port->number - port->serial->minor;
1543 if (!mos7720_port->open) {
1544 dev_dbg(&port->dev, "%s - port not opened\n", __func__);
1548 lData = UART_LCR_WLEN8;
1549 lStop = 0x00; /* 1 stop bit */
1550 lParity = 0x00; /* No parity */
1552 cflag = tty->termios.c_cflag;
1553 iflag = tty->termios.c_iflag;
1555 /* Change the number of bits */
1556 switch (cflag & CSIZE) {
1558 lData = UART_LCR_WLEN5;
1563 lData = UART_LCR_WLEN6;
1568 lData = UART_LCR_WLEN7;
1573 lData = UART_LCR_WLEN8;
1577 /* Change the Parity bit */
1578 if (cflag & PARENB) {
1579 if (cflag & PARODD) {
1580 lParity = UART_LCR_PARITY;
1581 dev_dbg(&port->dev, "%s - parity = odd\n", __func__);
1583 lParity = (UART_LCR_EPAR | UART_LCR_PARITY);
1584 dev_dbg(&port->dev, "%s - parity = even\n", __func__);
1588 dev_dbg(&port->dev, "%s - parity = none\n", __func__);
1592 lParity = lParity | 0x20;
1594 /* Change the Stop bit */
1595 if (cflag & CSTOPB) {
1596 lStop = UART_LCR_STOP;
1597 dev_dbg(&port->dev, "%s - stop bits = 2\n", __func__);
1600 dev_dbg(&port->dev, "%s - stop bits = 1\n", __func__);
1603 #define LCR_BITS_MASK 0x03 /* Mask for bits/char field */
1604 #define LCR_STOP_MASK 0x04 /* Mask for stop bits field */
1605 #define LCR_PAR_MASK 0x38 /* Mask for parity field */
1607 /* Update the LCR with the correct value */
1608 mos7720_port->shadowLCR &=
1609 ~(LCR_BITS_MASK | LCR_STOP_MASK | LCR_PAR_MASK);
1610 mos7720_port->shadowLCR |= (lData | lParity | lStop);
1613 /* Disable Interrupts */
1614 write_mos_reg(serial, port_number, IER, 0x00);
1615 write_mos_reg(serial, port_number, FCR, 0x00);
1616 write_mos_reg(serial, port_number, FCR, 0xcf);
1618 /* Send the updated LCR value to the mos7720 */
1619 write_mos_reg(serial, port_number, LCR, mos7720_port->shadowLCR);
1620 mos7720_port->shadowMCR = 0x0b;
1621 write_mos_reg(serial, port_number, MCR, mos7720_port->shadowMCR);
1623 /* set up the MCR register and send it to the mos7720 */
1624 mos7720_port->shadowMCR = UART_MCR_OUT2;
1626 mos7720_port->shadowMCR |= (UART_MCR_DTR | UART_MCR_RTS);
1628 if (cflag & CRTSCTS) {
1629 mos7720_port->shadowMCR |= (UART_MCR_XONANY);
1630 /* To set hardware flow control to the specified *
1631 * serial port, in SP1/2_CONTROL_REG */
1633 write_mos_reg(serial, dummy, SP_CONTROL_REG, 0x01);
1635 write_mos_reg(serial, dummy, SP_CONTROL_REG, 0x02);
1638 mos7720_port->shadowMCR &= ~(UART_MCR_XONANY);
1640 write_mos_reg(serial, port_number, MCR, mos7720_port->shadowMCR);
1642 /* Determine divisor based on baud rate */
1643 baud = tty_get_baud_rate(tty);
1645 /* pick a default, any default... */
1646 dev_dbg(&port->dev, "Picked default baud...\n");
1650 if (baud >= 230400) {
1651 set_higher_rates(mos7720_port, baud);
1652 /* Enable Interrupts */
1653 write_mos_reg(serial, port_number, IER, 0x0c);
1657 dev_dbg(&port->dev, "%s - baud rate = %d\n", __func__, baud);
1658 status = send_cmd_write_baud_rate(mos7720_port, baud);
1659 /* FIXME: needs to write actual resulting baud back not just
1662 tty_encode_baud_rate(tty, baud, baud);
1663 /* Enable Interrupts */
1664 write_mos_reg(serial, port_number, IER, 0x0c);
1666 if (port->read_urb->status != -EINPROGRESS) {
1667 status = usb_submit_urb(port->read_urb, GFP_ATOMIC);
1669 dev_dbg(&port->dev, "usb_submit_urb(read bulk) failed, status = %d\n", status);
1674 * mos7720_set_termios
1675 * this function is called by the tty driver when it wants to change the
1676 * termios structure.
1678 static void mos7720_set_termios(struct tty_struct *tty,
1679 struct usb_serial_port *port, struct ktermios *old_termios)
1683 struct usb_serial *serial;
1684 struct moschip_port *mos7720_port;
1686 serial = port->serial;
1688 mos7720_port = usb_get_serial_port_data(port);
1690 if (mos7720_port == NULL)
1693 if (!mos7720_port->open) {
1694 dev_dbg(&port->dev, "%s - port not opened\n", __func__);
1698 dev_dbg(&port->dev, "setting termios - ASPIRE\n");
1700 cflag = tty->termios.c_cflag;
1702 dev_dbg(&port->dev, "%s - cflag %08x iflag %08x\n", __func__,
1703 tty->termios.c_cflag, RELEVANT_IFLAG(tty->termios.c_iflag));
1705 dev_dbg(&port->dev, "%s - old cflag %08x old iflag %08x\n", __func__,
1706 old_termios->c_cflag, RELEVANT_IFLAG(old_termios->c_iflag));
1708 /* change the port settings to the new ones specified */
1709 change_port_settings(tty, mos7720_port, old_termios);
1711 if (port->read_urb->status != -EINPROGRESS) {
1712 status = usb_submit_urb(port->read_urb, GFP_ATOMIC);
1714 dev_dbg(&port->dev, "usb_submit_urb(read bulk) failed, status = %d\n", status);
1719 * get_lsr_info - get line status register info
1721 * Purpose: Let user call ioctl() to get info when the UART physically
1722 * is emptied. On bus types like RS485, the transmitter must
1723 * release the bus after transmitting. This must be done when
1724 * the transmit shift register is empty, not be done when the
1725 * transmit holding register is empty. This functionality
1726 * allows an RS485 driver to be written in user space.
1728 static int get_lsr_info(struct tty_struct *tty,
1729 struct moschip_port *mos7720_port, unsigned int __user *value)
1731 struct usb_serial_port *port = tty->driver_data;
1732 unsigned int result = 0;
1733 unsigned char data = 0;
1734 int port_number = port->number - port->serial->minor;
1737 count = mos7720_chars_in_buffer(tty);
1739 read_mos_reg(port->serial, port_number, LSR, &data);
1740 if ((data & (UART_LSR_TEMT | UART_LSR_THRE))
1741 == (UART_LSR_TEMT | UART_LSR_THRE)) {
1742 dev_dbg(&port->dev, "%s -- Empty\n", __func__);
1743 result = TIOCSER_TEMT;
1746 if (copy_to_user(value, &result, sizeof(int)))
1751 static int mos7720_tiocmget(struct tty_struct *tty)
1753 struct usb_serial_port *port = tty->driver_data;
1754 struct moschip_port *mos7720_port = usb_get_serial_port_data(port);
1755 unsigned int result = 0;
1759 mcr = mos7720_port->shadowMCR;
1760 msr = mos7720_port->shadowMSR;
1762 result = ((mcr & UART_MCR_DTR) ? TIOCM_DTR : 0) /* 0x002 */
1763 | ((mcr & UART_MCR_RTS) ? TIOCM_RTS : 0) /* 0x004 */
1764 | ((msr & UART_MSR_CTS) ? TIOCM_CTS : 0) /* 0x020 */
1765 | ((msr & UART_MSR_DCD) ? TIOCM_CAR : 0) /* 0x040 */
1766 | ((msr & UART_MSR_RI) ? TIOCM_RI : 0) /* 0x080 */
1767 | ((msr & UART_MSR_DSR) ? TIOCM_DSR : 0); /* 0x100 */
1772 static int mos7720_tiocmset(struct tty_struct *tty,
1773 unsigned int set, unsigned int clear)
1775 struct usb_serial_port *port = tty->driver_data;
1776 struct moschip_port *mos7720_port = usb_get_serial_port_data(port);
1779 mcr = mos7720_port->shadowMCR;
1781 if (set & TIOCM_RTS)
1782 mcr |= UART_MCR_RTS;
1783 if (set & TIOCM_DTR)
1784 mcr |= UART_MCR_DTR;
1785 if (set & TIOCM_LOOP)
1786 mcr |= UART_MCR_LOOP;
1788 if (clear & TIOCM_RTS)
1789 mcr &= ~UART_MCR_RTS;
1790 if (clear & TIOCM_DTR)
1791 mcr &= ~UART_MCR_DTR;
1792 if (clear & TIOCM_LOOP)
1793 mcr &= ~UART_MCR_LOOP;
1795 mos7720_port->shadowMCR = mcr;
1796 write_mos_reg(port->serial, port->number - port->serial->minor,
1797 MCR, mos7720_port->shadowMCR);
1802 static int set_modem_info(struct moschip_port *mos7720_port, unsigned int cmd,
1803 unsigned int __user *value)
1808 struct usb_serial_port *port;
1810 if (mos7720_port == NULL)
1813 port = (struct usb_serial_port *)mos7720_port->port;
1814 mcr = mos7720_port->shadowMCR;
1816 if (copy_from_user(&arg, value, sizeof(int)))
1821 if (arg & TIOCM_RTS)
1822 mcr |= UART_MCR_RTS;
1823 if (arg & TIOCM_DTR)
1824 mcr |= UART_MCR_RTS;
1825 if (arg & TIOCM_LOOP)
1826 mcr |= UART_MCR_LOOP;
1830 if (arg & TIOCM_RTS)
1831 mcr &= ~UART_MCR_RTS;
1832 if (arg & TIOCM_DTR)
1833 mcr &= ~UART_MCR_RTS;
1834 if (arg & TIOCM_LOOP)
1835 mcr &= ~UART_MCR_LOOP;
1840 mos7720_port->shadowMCR = mcr;
1841 write_mos_reg(port->serial, port->number - port->serial->minor,
1842 MCR, mos7720_port->shadowMCR);
1847 static int get_serial_info(struct moschip_port *mos7720_port,
1848 struct serial_struct __user *retinfo)
1850 struct serial_struct tmp;
1855 memset(&tmp, 0, sizeof(tmp));
1857 tmp.type = PORT_16550A;
1858 tmp.line = mos7720_port->port->serial->minor;
1859 tmp.port = mos7720_port->port->number;
1861 tmp.flags = ASYNC_SKIP_TEST | ASYNC_AUTO_IRQ;
1862 tmp.xmit_fifo_size = NUM_URBS * URB_TRANSFER_BUFFER_SIZE;
1863 tmp.baud_base = 9600;
1864 tmp.close_delay = 5*HZ;
1865 tmp.closing_wait = 30*HZ;
1867 if (copy_to_user(retinfo, &tmp, sizeof(*retinfo)))
1872 static int mos7720_ioctl(struct tty_struct *tty,
1873 unsigned int cmd, unsigned long arg)
1875 struct usb_serial_port *port = tty->driver_data;
1876 struct moschip_port *mos7720_port;
1878 mos7720_port = usb_get_serial_port_data(port);
1879 if (mos7720_port == NULL)
1882 dev_dbg(&port->dev, "%s - cmd = 0x%x", __func__, cmd);
1886 dev_dbg(&port->dev, "%s TIOCSERGETLSR\n", __func__);
1887 return get_lsr_info(tty, mos7720_port,
1888 (unsigned int __user *)arg);
1890 /* FIXME: These should be using the mode methods */
1893 dev_dbg(&port->dev, "%s TIOCMSET/TIOCMBIC/TIOCMSET\n", __func__);
1894 return set_modem_info(mos7720_port, cmd,
1895 (unsigned int __user *)arg);
1898 dev_dbg(&port->dev, "%s TIOCGSERIAL\n", __func__);
1899 return get_serial_info(mos7720_port,
1900 (struct serial_struct __user *)arg);
1903 return -ENOIOCTLCMD;
1906 static int mos7720_startup(struct usb_serial *serial)
1908 struct usb_device *dev;
1913 product = le16_to_cpu(serial->dev->descriptor.idProduct);
1917 * The 7715 uses the first bulk in/out endpoint pair for the parallel
1918 * port, and the second for the serial port. Because the usbserial core
1919 * assumes both pairs are serial ports, we must engage in a bit of
1920 * subterfuge and swap the pointers for ports 0 and 1 in order to make
1921 * port 0 point to the serial port. However, both moschip devices use a
1922 * single interrupt-in endpoint for both ports (as mentioned a little
1923 * further down), and this endpoint was assigned to port 0. So after
1924 * the swap, we must copy the interrupt endpoint elements from port 1
1925 * (as newly assigned) to port 0, and null out port 1 pointers.
1927 if (product == MOSCHIP_DEVICE_ID_7715) {
1928 struct usb_serial_port *tmp = serial->port[0];
1929 serial->port[0] = serial->port[1];
1930 serial->port[1] = tmp;
1931 serial->port[0]->interrupt_in_urb = tmp->interrupt_in_urb;
1932 serial->port[0]->interrupt_in_buffer = tmp->interrupt_in_buffer;
1933 serial->port[0]->interrupt_in_endpointAddress =
1934 tmp->interrupt_in_endpointAddress;
1935 serial->port[1]->interrupt_in_urb = NULL;
1936 serial->port[1]->interrupt_in_buffer = NULL;
1939 /* setting configuration feature to one */
1940 usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0),
1941 (__u8)0x03, 0x00, 0x01, 0x00, NULL, 0x00, 5000);
1943 /* start the interrupt urb */
1944 ret_val = usb_submit_urb(serial->port[0]->interrupt_in_urb, GFP_KERNEL);
1947 "%s - Error %d submitting control urb\n",
1950 #ifdef CONFIG_USB_SERIAL_MOS7715_PARPORT
1951 if (product == MOSCHIP_DEVICE_ID_7715) {
1952 ret_val = mos7715_parport_init(serial);
1957 /* LSR For Port 1 */
1958 read_mos_reg(serial, 0, LSR, &data);
1959 dev_dbg(&dev->dev, "LSR:%x\n", data);
1964 static void mos7720_release(struct usb_serial *serial)
1966 #ifdef CONFIG_USB_SERIAL_MOS7715_PARPORT
1967 /* close the parallel port */
1969 if (le16_to_cpu(serial->dev->descriptor.idProduct)
1970 == MOSCHIP_DEVICE_ID_7715) {
1971 struct urbtracker *urbtrack;
1972 unsigned long flags;
1973 struct mos7715_parport *mos_parport =
1974 usb_get_serial_data(serial);
1976 /* prevent NULL ptr dereference in port callbacks */
1977 spin_lock(&release_lock);
1978 mos_parport->pp->private_data = NULL;
1979 spin_unlock(&release_lock);
1981 /* wait for synchronous usb calls to return */
1982 if (mos_parport->msg_pending)
1983 wait_for_completion_timeout(&mos_parport->syncmsg_compl,
1984 msecs_to_jiffies(MOS_WDR_TIMEOUT));
1986 parport_remove_port(mos_parport->pp);
1987 usb_set_serial_data(serial, NULL);
1988 mos_parport->serial = NULL;
1990 /* if tasklet currently scheduled, wait for it to complete */
1991 tasklet_kill(&mos_parport->urb_tasklet);
1993 /* unlink any urbs sent by the tasklet */
1994 spin_lock_irqsave(&mos_parport->listlock, flags);
1995 list_for_each_entry(urbtrack,
1996 &mos_parport->active_urbs,
1998 usb_unlink_urb(urbtrack->urb);
1999 spin_unlock_irqrestore(&mos_parport->listlock, flags);
2001 kref_put(&mos_parport->ref_count, destroy_mos_parport);
2006 static int mos7720_port_probe(struct usb_serial_port *port)
2008 struct moschip_port *mos7720_port;
2010 mos7720_port = kzalloc(sizeof(*mos7720_port), GFP_KERNEL);
2014 /* Initialize all port interrupt end point to port 0 int endpoint.
2015 * Our device has only one interrupt endpoint common to all ports.
2017 port->interrupt_in_endpointAddress =
2018 port->serial->port[0]->interrupt_in_endpointAddress;
2019 mos7720_port->port = port;
2021 usb_set_serial_port_data(port, mos7720_port);
2026 static int mos7720_port_remove(struct usb_serial_port *port)
2028 struct moschip_port *mos7720_port;
2030 mos7720_port = usb_get_serial_port_data(port);
2031 kfree(mos7720_port);
2036 static struct usb_serial_driver moschip7720_2port_driver = {
2038 .owner = THIS_MODULE,
2039 .name = "moschip7720",
2041 .description = "Moschip 2 port adapter",
2042 .id_table = id_table,
2043 .calc_num_ports = mos77xx_calc_num_ports,
2044 .open = mos7720_open,
2045 .close = mos7720_close,
2046 .throttle = mos7720_throttle,
2047 .unthrottle = mos7720_unthrottle,
2048 .probe = mos77xx_probe,
2049 .attach = mos7720_startup,
2050 .release = mos7720_release,
2051 .port_probe = mos7720_port_probe,
2052 .port_remove = mos7720_port_remove,
2053 .ioctl = mos7720_ioctl,
2054 .tiocmget = mos7720_tiocmget,
2055 .tiocmset = mos7720_tiocmset,
2056 .set_termios = mos7720_set_termios,
2057 .write = mos7720_write,
2058 .write_room = mos7720_write_room,
2059 .chars_in_buffer = mos7720_chars_in_buffer,
2060 .break_ctl = mos7720_break,
2061 .read_bulk_callback = mos7720_bulk_in_callback,
2062 .read_int_callback = NULL /* dynamically assigned in probe() */
2065 static struct usb_serial_driver * const serial_drivers[] = {
2066 &moschip7720_2port_driver, NULL
2069 module_usb_serial_driver(serial_drivers, id_table);
2071 MODULE_AUTHOR(DRIVER_AUTHOR);
2072 MODULE_DESCRIPTION(DRIVER_DESC);
2073 MODULE_LICENSE("GPL");