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 (HZ * 5)
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);
230 int status = usb_control_msg(usbdev, pipe, request, requesttype, value,
231 index, data, 1, MOS_WDR_TIMEOUT);
233 dev_err(&usbdev->dev,
234 "mos7720: usb_control_msg() failed: %d", status);
238 #ifdef CONFIG_USB_SERIAL_MOS7715_PARPORT
240 static inline int mos7715_change_mode(struct mos7715_parport *mos_parport,
241 enum mos7715_pp_modes mode)
243 mos_parport->shadowECR = mode;
244 write_mos_reg(mos_parport->serial, dummy, ECR, mos_parport->shadowECR);
248 static void destroy_mos_parport(struct kref *kref)
250 struct mos7715_parport *mos_parport =
251 container_of(kref, struct mos7715_parport, ref_count);
256 static void destroy_urbtracker(struct kref *kref)
258 struct urbtracker *urbtrack =
259 container_of(kref, struct urbtracker, ref_count);
260 struct mos7715_parport *mos_parport = urbtrack->mos_parport;
262 usb_free_urb(urbtrack->urb);
264 kref_put(&mos_parport->ref_count, destroy_mos_parport);
268 * This runs as a tasklet when sending an urb in a non-blocking parallel
269 * port callback had to be deferred because the disconnect mutex could not be
270 * obtained at the time.
272 static void send_deferred_urbs(unsigned long _mos_parport)
276 struct mos7715_parport *mos_parport = (void *)_mos_parport;
277 struct urbtracker *urbtrack, *tmp;
278 struct list_head *cursor, *next;
281 /* if release function ran, game over */
282 if (unlikely(mos_parport->serial == NULL))
285 dev = &mos_parport->serial->dev->dev;
287 /* try again to get the mutex */
288 if (!mutex_trylock(&mos_parport->serial->disc_mutex)) {
289 dev_dbg(dev, "%s: rescheduling tasklet\n", __func__);
290 tasklet_schedule(&mos_parport->urb_tasklet);
294 /* if device disconnected, game over */
295 if (unlikely(mos_parport->serial->disconnected)) {
296 mutex_unlock(&mos_parport->serial->disc_mutex);
300 spin_lock_irqsave(&mos_parport->listlock, flags);
301 if (list_empty(&mos_parport->deferred_urbs)) {
302 spin_unlock_irqrestore(&mos_parport->listlock, flags);
303 mutex_unlock(&mos_parport->serial->disc_mutex);
304 dev_dbg(dev, "%s: deferred_urbs list empty\n", __func__);
308 /* move contents of deferred_urbs list to active_urbs list and submit */
309 list_for_each_safe(cursor, next, &mos_parport->deferred_urbs)
310 list_move_tail(cursor, &mos_parport->active_urbs);
311 list_for_each_entry_safe(urbtrack, tmp, &mos_parport->active_urbs,
313 ret_val = usb_submit_urb(urbtrack->urb, GFP_ATOMIC);
314 dev_dbg(dev, "%s: urb submitted\n", __func__);
316 dev_err(dev, "usb_submit_urb() failed: %d\n", ret_val);
317 list_del(&urbtrack->urblist_entry);
318 kref_put(&urbtrack->ref_count, destroy_urbtracker);
321 spin_unlock_irqrestore(&mos_parport->listlock, flags);
322 mutex_unlock(&mos_parport->serial->disc_mutex);
325 /* callback for parallel port control urbs submitted asynchronously */
326 static void async_complete(struct urb *urb)
328 struct urbtracker *urbtrack = urb->context;
329 int status = urb->status;
331 if (unlikely(status))
332 dev_dbg(&urb->dev->dev, "%s - nonzero urb status received: %d\n", __func__, status);
334 /* remove the urbtracker from the active_urbs list */
335 spin_lock(&urbtrack->mos_parport->listlock);
336 list_del(&urbtrack->urblist_entry);
337 spin_unlock(&urbtrack->mos_parport->listlock);
338 kref_put(&urbtrack->ref_count, destroy_urbtracker);
341 static int write_parport_reg_nonblock(struct mos7715_parport *mos_parport,
342 enum mos_regs reg, __u8 data)
344 struct urbtracker *urbtrack;
347 struct usb_ctrlrequest setup;
348 struct usb_serial *serial = mos_parport->serial;
349 struct usb_device *usbdev = serial->dev;
351 /* create and initialize the control urb and containing urbtracker */
352 urbtrack = kmalloc(sizeof(struct urbtracker), GFP_ATOMIC);
353 if (urbtrack == NULL) {
354 dev_err(&usbdev->dev, "out of memory");
357 kref_get(&mos_parport->ref_count);
358 urbtrack->mos_parport = mos_parport;
359 urbtrack->urb = usb_alloc_urb(0, GFP_ATOMIC);
360 if (urbtrack->urb == NULL) {
361 dev_err(&usbdev->dev, "out of urbs");
365 setup.bRequestType = (__u8)0x40;
366 setup.bRequest = (__u8)0x0e;
367 setup.wValue = get_reg_value(reg, dummy);
368 setup.wIndex = get_reg_index(reg);
370 usb_fill_control_urb(urbtrack->urb, usbdev,
371 usb_sndctrlpipe(usbdev, 0),
372 (unsigned char *)&setup,
373 NULL, 0, async_complete, urbtrack);
374 kref_init(&urbtrack->ref_count);
375 INIT_LIST_HEAD(&urbtrack->urblist_entry);
378 * get the disconnect mutex, or add tracker to the deferred_urbs list
379 * and schedule a tasklet to try again later
381 if (!mutex_trylock(&serial->disc_mutex)) {
382 spin_lock_irqsave(&mos_parport->listlock, flags);
383 list_add_tail(&urbtrack->urblist_entry,
384 &mos_parport->deferred_urbs);
385 spin_unlock_irqrestore(&mos_parport->listlock, flags);
386 tasklet_schedule(&mos_parport->urb_tasklet);
387 dev_dbg(&usbdev->dev, "tasklet scheduled");
391 /* bail if device disconnected */
392 if (serial->disconnected) {
393 kref_put(&urbtrack->ref_count, destroy_urbtracker);
394 mutex_unlock(&serial->disc_mutex);
398 /* add the tracker to the active_urbs list and submit */
399 spin_lock_irqsave(&mos_parport->listlock, flags);
400 list_add_tail(&urbtrack->urblist_entry, &mos_parport->active_urbs);
401 spin_unlock_irqrestore(&mos_parport->listlock, flags);
402 ret_val = usb_submit_urb(urbtrack->urb, GFP_ATOMIC);
403 mutex_unlock(&serial->disc_mutex);
405 dev_err(&usbdev->dev,
406 "%s: submit_urb() failed: %d", __func__, ret_val);
407 spin_lock_irqsave(&mos_parport->listlock, flags);
408 list_del(&urbtrack->urblist_entry);
409 spin_unlock_irqrestore(&mos_parport->listlock, flags);
410 kref_put(&urbtrack->ref_count, destroy_urbtracker);
417 * This is the the common top part of all parallel port callback operations that
418 * send synchronous messages to the device. This implements convoluted locking
419 * that avoids two scenarios: (1) a port operation is called after usbserial
420 * has called our release function, at which point struct mos7715_parport has
421 * been destroyed, and (2) the device has been disconnected, but usbserial has
422 * not called the release function yet because someone has a serial port open.
423 * The shared release_lock prevents the first, and the mutex and disconnected
424 * flag maintained by usbserial covers the second. We also use the msg_pending
425 * flag to ensure that all synchronous usb messgage calls have completed before
426 * our release function can return.
428 static int parport_prologue(struct parport *pp)
430 struct mos7715_parport *mos_parport;
432 spin_lock(&release_lock);
433 mos_parport = pp->private_data;
434 if (unlikely(mos_parport == NULL)) {
435 /* release fn called, port struct destroyed */
436 spin_unlock(&release_lock);
439 mos_parport->msg_pending = true; /* synch usb call pending */
440 INIT_COMPLETION(mos_parport->syncmsg_compl);
441 spin_unlock(&release_lock);
443 mutex_lock(&mos_parport->serial->disc_mutex);
444 if (mos_parport->serial->disconnected) {
445 /* device disconnected */
446 mutex_unlock(&mos_parport->serial->disc_mutex);
447 mos_parport->msg_pending = false;
448 complete(&mos_parport->syncmsg_compl);
456 * This is the the common bottom part of all parallel port functions that send
457 * synchronous messages to the device.
459 static inline void parport_epilogue(struct parport *pp)
461 struct mos7715_parport *mos_parport = pp->private_data;
462 mutex_unlock(&mos_parport->serial->disc_mutex);
463 mos_parport->msg_pending = false;
464 complete(&mos_parport->syncmsg_compl);
467 static void parport_mos7715_write_data(struct parport *pp, unsigned char d)
469 struct mos7715_parport *mos_parport = pp->private_data;
471 if (parport_prologue(pp) < 0)
473 mos7715_change_mode(mos_parport, SPP);
474 write_mos_reg(mos_parport->serial, dummy, DPR, (__u8)d);
475 parport_epilogue(pp);
478 static unsigned char parport_mos7715_read_data(struct parport *pp)
480 struct mos7715_parport *mos_parport = pp->private_data;
483 if (parport_prologue(pp) < 0)
485 read_mos_reg(mos_parport->serial, dummy, DPR, &d);
486 parport_epilogue(pp);
490 static void parport_mos7715_write_control(struct parport *pp, unsigned char d)
492 struct mos7715_parport *mos_parport = pp->private_data;
495 if (parport_prologue(pp) < 0)
497 data = ((__u8)d & 0x0f) | (mos_parport->shadowDCR & 0xf0);
498 write_mos_reg(mos_parport->serial, dummy, DCR, data);
499 mos_parport->shadowDCR = data;
500 parport_epilogue(pp);
503 static unsigned char parport_mos7715_read_control(struct parport *pp)
505 struct mos7715_parport *mos_parport = pp->private_data;
508 spin_lock(&release_lock);
509 mos_parport = pp->private_data;
510 if (unlikely(mos_parport == NULL)) {
511 spin_unlock(&release_lock);
514 dcr = mos_parport->shadowDCR & 0x0f;
515 spin_unlock(&release_lock);
519 static unsigned char parport_mos7715_frob_control(struct parport *pp,
523 struct mos7715_parport *mos_parport = pp->private_data;
528 if (parport_prologue(pp) < 0)
530 mos_parport->shadowDCR = (mos_parport->shadowDCR & (~mask)) ^ val;
531 write_mos_reg(mos_parport->serial, dummy, DCR, mos_parport->shadowDCR);
532 dcr = mos_parport->shadowDCR & 0x0f;
533 parport_epilogue(pp);
537 static unsigned char parport_mos7715_read_status(struct parport *pp)
539 unsigned char status;
540 struct mos7715_parport *mos_parport = pp->private_data;
542 spin_lock(&release_lock);
543 mos_parport = pp->private_data;
544 if (unlikely(mos_parport == NULL)) { /* release called */
545 spin_unlock(&release_lock);
548 status = atomic_read(&mos_parport->shadowDSR) & 0xf8;
549 spin_unlock(&release_lock);
553 static void parport_mos7715_enable_irq(struct parport *pp)
557 static void parport_mos7715_disable_irq(struct parport *pp)
561 static void parport_mos7715_data_forward(struct parport *pp)
563 struct mos7715_parport *mos_parport = pp->private_data;
565 if (parport_prologue(pp) < 0)
567 mos7715_change_mode(mos_parport, PS2);
568 mos_parport->shadowDCR &= ~0x20;
569 write_mos_reg(mos_parport->serial, dummy, DCR, mos_parport->shadowDCR);
570 parport_epilogue(pp);
573 static void parport_mos7715_data_reverse(struct parport *pp)
575 struct mos7715_parport *mos_parport = pp->private_data;
577 if (parport_prologue(pp) < 0)
579 mos7715_change_mode(mos_parport, PS2);
580 mos_parport->shadowDCR |= 0x20;
581 write_mos_reg(mos_parport->serial, dummy, DCR, mos_parport->shadowDCR);
582 parport_epilogue(pp);
585 static void parport_mos7715_init_state(struct pardevice *dev,
586 struct parport_state *s)
588 s->u.pc.ctr = DCR_INIT_VAL;
589 s->u.pc.ecr = ECR_INIT_VAL;
592 /* N.B. Parport core code requires that this function not block */
593 static void parport_mos7715_save_state(struct parport *pp,
594 struct parport_state *s)
596 struct mos7715_parport *mos_parport;
598 spin_lock(&release_lock);
599 mos_parport = pp->private_data;
600 if (unlikely(mos_parport == NULL)) { /* release called */
601 spin_unlock(&release_lock);
604 s->u.pc.ctr = mos_parport->shadowDCR;
605 s->u.pc.ecr = mos_parport->shadowECR;
606 spin_unlock(&release_lock);
609 /* N.B. Parport core code requires that this function not block */
610 static void parport_mos7715_restore_state(struct parport *pp,
611 struct parport_state *s)
613 struct mos7715_parport *mos_parport;
615 spin_lock(&release_lock);
616 mos_parport = pp->private_data;
617 if (unlikely(mos_parport == NULL)) { /* release called */
618 spin_unlock(&release_lock);
621 write_parport_reg_nonblock(mos_parport, DCR, mos_parport->shadowDCR);
622 write_parport_reg_nonblock(mos_parport, ECR, mos_parport->shadowECR);
623 spin_unlock(&release_lock);
626 static size_t parport_mos7715_write_compat(struct parport *pp,
628 size_t len, int flags)
631 struct mos7715_parport *mos_parport = pp->private_data;
634 if (parport_prologue(pp) < 0)
636 mos7715_change_mode(mos_parport, PPF);
637 retval = usb_bulk_msg(mos_parport->serial->dev,
638 usb_sndbulkpipe(mos_parport->serial->dev, 2),
639 (void *)buffer, len, &actual_len,
641 parport_epilogue(pp);
643 dev_err(&mos_parport->serial->dev->dev,
644 "mos7720: usb_bulk_msg() failed: %d", retval);
650 static struct parport_operations parport_mos7715_ops = {
651 .owner = THIS_MODULE,
652 .write_data = parport_mos7715_write_data,
653 .read_data = parport_mos7715_read_data,
655 .write_control = parport_mos7715_write_control,
656 .read_control = parport_mos7715_read_control,
657 .frob_control = parport_mos7715_frob_control,
659 .read_status = parport_mos7715_read_status,
661 .enable_irq = parport_mos7715_enable_irq,
662 .disable_irq = parport_mos7715_disable_irq,
664 .data_forward = parport_mos7715_data_forward,
665 .data_reverse = parport_mos7715_data_reverse,
667 .init_state = parport_mos7715_init_state,
668 .save_state = parport_mos7715_save_state,
669 .restore_state = parport_mos7715_restore_state,
671 .compat_write_data = parport_mos7715_write_compat,
673 .nibble_read_data = parport_ieee1284_read_nibble,
674 .byte_read_data = parport_ieee1284_read_byte,
678 * Allocate and initialize parallel port control struct, initialize
679 * the parallel port hardware device, and register with the parport subsystem.
681 static int mos7715_parport_init(struct usb_serial *serial)
683 struct mos7715_parport *mos_parport;
685 /* allocate and initialize parallel port control struct */
686 mos_parport = kzalloc(sizeof(struct mos7715_parport), GFP_KERNEL);
687 if (mos_parport == NULL) {
688 dev_dbg(&serial->dev->dev, "%s: kzalloc failed\n", __func__);
691 mos_parport->msg_pending = false;
692 kref_init(&mos_parport->ref_count);
693 spin_lock_init(&mos_parport->listlock);
694 INIT_LIST_HEAD(&mos_parport->active_urbs);
695 INIT_LIST_HEAD(&mos_parport->deferred_urbs);
696 usb_set_serial_data(serial, mos_parport); /* hijack private pointer */
697 mos_parport->serial = serial;
698 tasklet_init(&mos_parport->urb_tasklet, send_deferred_urbs,
699 (unsigned long) mos_parport);
700 init_completion(&mos_parport->syncmsg_compl);
702 /* cycle parallel port reset bit */
703 write_mos_reg(mos_parport->serial, dummy, PP_REG, (__u8)0x80);
704 write_mos_reg(mos_parport->serial, dummy, PP_REG, (__u8)0x00);
706 /* initialize device registers */
707 mos_parport->shadowDCR = DCR_INIT_VAL;
708 write_mos_reg(mos_parport->serial, dummy, DCR, mos_parport->shadowDCR);
709 mos_parport->shadowECR = ECR_INIT_VAL;
710 write_mos_reg(mos_parport->serial, dummy, ECR, mos_parport->shadowECR);
712 /* register with parport core */
713 mos_parport->pp = parport_register_port(0, PARPORT_IRQ_NONE,
715 &parport_mos7715_ops);
716 if (mos_parport->pp == NULL) {
717 dev_err(&serial->interface->dev,
718 "Could not register parport\n");
719 kref_put(&mos_parport->ref_count, destroy_mos_parport);
722 mos_parport->pp->private_data = mos_parport;
723 mos_parport->pp->modes = PARPORT_MODE_COMPAT | PARPORT_MODE_PCSPP;
724 mos_parport->pp->dev = &serial->interface->dev;
725 parport_announce_port(mos_parport->pp);
729 #endif /* CONFIG_USB_SERIAL_MOS7715_PARPORT */
732 * mos7720_interrupt_callback
733 * this is the callback function for when we have received data on the
734 * interrupt endpoint.
736 static void mos7720_interrupt_callback(struct urb *urb)
740 int status = urb->status;
741 struct device *dev = &urb->dev->dev;
753 /* this urb is terminated, clean up */
754 dev_dbg(dev, "%s - urb shutting down with status: %d\n", __func__, status);
757 dev_dbg(dev, "%s - nonzero urb status received: %d\n", __func__, status);
761 length = urb->actual_length;
762 data = urb->transfer_buffer;
764 /* Moschip get 4 bytes
765 * Byte 1 IIR Port 1 (port.number is 0)
766 * Byte 2 IIR Port 2 (port.number is 1)
767 * Byte 3 --------------
768 * Byte 4 FIFO status for both */
770 /* the above description is inverted
771 * oneukum 2007-03-14 */
773 if (unlikely(length != 4)) {
774 dev_dbg(dev, "Wrong data !!!\n");
781 if ((sp1 | sp2) & 0x01) {
782 /* No Interrupt Pending in both the ports */
783 dev_dbg(dev, "No Interrupt !!!\n");
785 switch (sp1 & 0x0f) {
787 dev_dbg(dev, "Serial Port 1: Receiver status error or address bit detected in 9-bit mode\n");
790 dev_dbg(dev, "Serial Port 1: Receiver time out\n");
793 /* dev_dbg(dev, "Serial Port 1: Modem status change\n"); */
797 switch (sp2 & 0x0f) {
799 dev_dbg(dev, "Serial Port 2: Receiver status error or address bit detected in 9-bit mode\n");
802 dev_dbg(dev, "Serial Port 2: Receiver time out\n");
805 /* dev_dbg(dev, "Serial Port 2: Modem status change\n"); */
811 result = usb_submit_urb(urb, GFP_ATOMIC);
813 dev_err(dev, "%s - Error %d submitting control urb\n", __func__, result);
817 * mos7715_interrupt_callback
818 * this is the 7715's callback function for when we have received data on
819 * the interrupt endpoint.
821 static void mos7715_interrupt_callback(struct urb *urb)
825 int status = urb->status;
826 struct device *dev = &urb->dev->dev;
838 /* this urb is terminated, clean up */
839 dev_dbg(dev, "%s - urb shutting down with status: %d\n", __func__, status);
842 dev_dbg(dev, "%s - nonzero urb status received: %d\n", __func__, status);
846 length = urb->actual_length;
847 data = urb->transfer_buffer;
849 /* Structure of data from 7715 device:
850 * Byte 1: IIR serial Port
852 * Byte 2: DSR parallel port
853 * Byte 4: FIFO status for both */
855 if (unlikely(length != 4)) {
856 dev_dbg(dev, "Wrong data !!!\n");
861 if (!(iir & 0x01)) { /* serial port interrupt pending */
862 switch (iir & 0x0f) {
864 dev_dbg(dev, "Serial Port: Receiver status error or address bit detected in 9-bit mode\n\n");
867 dev_dbg(dev, "Serial Port: Receiver time out\n");
870 /* dev_dbg(dev, "Serial Port: Modem status change\n"); */
875 #ifdef CONFIG_USB_SERIAL_MOS7715_PARPORT
876 { /* update local copy of DSR reg */
877 struct usb_serial_port *port = urb->context;
878 struct mos7715_parport *mos_parport = port->serial->private;
879 if (unlikely(mos_parport == NULL))
881 atomic_set(&mos_parport->shadowDSR, data[2]);
886 result = usb_submit_urb(urb, GFP_ATOMIC);
888 dev_err(dev, "%s - Error %d submitting control urb\n", __func__, result);
892 * mos7720_bulk_in_callback
893 * this is the callback function for when we have received data on the
896 static void mos7720_bulk_in_callback(struct urb *urb)
899 unsigned char *data ;
900 struct usb_serial_port *port;
901 int status = urb->status;
904 dev_dbg(&urb->dev->dev, "nonzero read bulk status received: %d\n", status);
910 dev_dbg(&port->dev, "Entering...%s\n", __func__);
912 data = urb->transfer_buffer;
914 if (urb->actual_length) {
915 tty_insert_flip_string(&port->port, data, urb->actual_length);
916 tty_flip_buffer_push(&port->port);
919 if (port->read_urb->status != -EINPROGRESS) {
920 retval = usb_submit_urb(port->read_urb, GFP_ATOMIC);
922 dev_dbg(&port->dev, "usb_submit_urb(read bulk) failed, retval = %d\n", retval);
927 * mos7720_bulk_out_data_callback
928 * this is the callback function for when we have finished sending serial
929 * data on the bulk out endpoint.
931 static void mos7720_bulk_out_data_callback(struct urb *urb)
933 struct moschip_port *mos7720_port;
934 int status = urb->status;
937 dev_dbg(&urb->dev->dev, "nonzero write bulk status received:%d\n", status);
941 mos7720_port = urb->context;
943 dev_dbg(&urb->dev->dev, "NULL mos7720_port pointer\n");
947 if (mos7720_port->open)
948 tty_port_tty_wakeup(&mos7720_port->port->port);
953 * this function installs the appropriate read interrupt endpoint callback
954 * depending on whether the device is a 7720 or 7715, thus avoiding costly
955 * run-time checks in the high-frequency callback routine itself.
957 static int mos77xx_probe(struct usb_serial *serial,
958 const struct usb_device_id *id)
960 if (id->idProduct == MOSCHIP_DEVICE_ID_7715)
961 moschip7720_2port_driver.read_int_callback =
962 mos7715_interrupt_callback;
964 moschip7720_2port_driver.read_int_callback =
965 mos7720_interrupt_callback;
970 static int mos77xx_calc_num_ports(struct usb_serial *serial)
972 u16 product = le16_to_cpu(serial->dev->descriptor.idProduct);
973 if (product == MOSCHIP_DEVICE_ID_7715)
979 static int mos7720_open(struct tty_struct *tty, struct usb_serial_port *port)
981 struct usb_serial *serial;
983 struct moschip_port *mos7720_port;
987 int allocated_urbs = 0;
990 serial = port->serial;
992 mos7720_port = usb_get_serial_port_data(port);
993 if (mos7720_port == NULL)
996 usb_clear_halt(serial->dev, port->write_urb->pipe);
997 usb_clear_halt(serial->dev, port->read_urb->pipe);
999 /* Initialising the write urb pool */
1000 for (j = 0; j < NUM_URBS; ++j) {
1001 urb = usb_alloc_urb(0, GFP_KERNEL);
1002 mos7720_port->write_urb_pool[j] = urb;
1005 dev_err(&port->dev, "No more urbs???\n");
1009 urb->transfer_buffer = kmalloc(URB_TRANSFER_BUFFER_SIZE,
1011 if (!urb->transfer_buffer) {
1013 "%s-out of memory for urb buffers.\n",
1015 usb_free_urb(mos7720_port->write_urb_pool[j]);
1016 mos7720_port->write_urb_pool[j] = NULL;
1022 if (!allocated_urbs)
1025 /* Initialize MCS7720 -- Write Init values to corresponding Registers
1037 * 0x08 : SP1/2 Control Reg
1039 port_number = port->number - port->serial->minor;
1040 read_mos_reg(serial, port_number, LSR, &data);
1042 dev_dbg(&port->dev, "SS::%p LSR:%x\n", mos7720_port, data);
1044 write_mos_reg(serial, dummy, SP1_REG, 0x02);
1045 write_mos_reg(serial, dummy, SP2_REG, 0x02);
1047 write_mos_reg(serial, port_number, IER, 0x00);
1048 write_mos_reg(serial, port_number, FCR, 0x00);
1050 write_mos_reg(serial, port_number, FCR, 0xcf);
1051 mos7720_port->shadowLCR = 0x03;
1052 write_mos_reg(serial, port_number, LCR, mos7720_port->shadowLCR);
1053 mos7720_port->shadowMCR = 0x0b;
1054 write_mos_reg(serial, port_number, MCR, mos7720_port->shadowMCR);
1056 write_mos_reg(serial, port_number, SP_CONTROL_REG, 0x00);
1057 read_mos_reg(serial, dummy, SP_CONTROL_REG, &data);
1058 data = data | (port->number - port->serial->minor + 1);
1059 write_mos_reg(serial, dummy, SP_CONTROL_REG, data);
1060 mos7720_port->shadowLCR = 0x83;
1061 write_mos_reg(serial, port_number, LCR, mos7720_port->shadowLCR);
1062 write_mos_reg(serial, port_number, THR, 0x0c);
1063 write_mos_reg(serial, port_number, IER, 0x00);
1064 mos7720_port->shadowLCR = 0x03;
1065 write_mos_reg(serial, port_number, LCR, mos7720_port->shadowLCR);
1066 write_mos_reg(serial, port_number, IER, 0x0c);
1068 response = usb_submit_urb(port->read_urb, GFP_KERNEL);
1070 dev_err(&port->dev, "%s - Error %d submitting read urb\n",
1071 __func__, response);
1073 /* initialize our port settings */
1074 mos7720_port->shadowMCR = UART_MCR_OUT2; /* Must set to enable ints! */
1076 /* send a open port command */
1077 mos7720_port->open = 1;
1083 * mos7720_chars_in_buffer
1084 * this function is called by the tty driver when it wants to know how many
1085 * bytes of data we currently have outstanding in the port (data that has
1086 * been written, but hasn't made it out the port yet)
1087 * If successful, we return the number of bytes left to be written in the
1089 * Otherwise we return a negative error number.
1091 static int mos7720_chars_in_buffer(struct tty_struct *tty)
1093 struct usb_serial_port *port = tty->driver_data;
1096 struct moschip_port *mos7720_port;
1098 mos7720_port = usb_get_serial_port_data(port);
1099 if (mos7720_port == NULL)
1102 for (i = 0; i < NUM_URBS; ++i) {
1103 if (mos7720_port->write_urb_pool[i] &&
1104 mos7720_port->write_urb_pool[i]->status == -EINPROGRESS)
1105 chars += URB_TRANSFER_BUFFER_SIZE;
1107 dev_dbg(&port->dev, "%s - returns %d\n", __func__, chars);
1111 static void mos7720_close(struct usb_serial_port *port)
1113 struct usb_serial *serial;
1114 struct moschip_port *mos7720_port;
1117 serial = port->serial;
1119 mos7720_port = usb_get_serial_port_data(port);
1120 if (mos7720_port == NULL)
1123 for (j = 0; j < NUM_URBS; ++j)
1124 usb_kill_urb(mos7720_port->write_urb_pool[j]);
1126 /* Freeing Write URBs */
1127 for (j = 0; j < NUM_URBS; ++j) {
1128 if (mos7720_port->write_urb_pool[j]) {
1129 kfree(mos7720_port->write_urb_pool[j]->transfer_buffer);
1130 usb_free_urb(mos7720_port->write_urb_pool[j]);
1134 /* While closing port, shutdown all bulk read, write *
1135 * and interrupt read if they exists, otherwise nop */
1136 usb_kill_urb(port->write_urb);
1137 usb_kill_urb(port->read_urb);
1139 write_mos_reg(serial, port->number - port->serial->minor, MCR, 0x00);
1140 write_mos_reg(serial, port->number - port->serial->minor, IER, 0x00);
1142 mos7720_port->open = 0;
1145 static void mos7720_break(struct tty_struct *tty, int break_state)
1147 struct usb_serial_port *port = tty->driver_data;
1149 struct usb_serial *serial;
1150 struct moschip_port *mos7720_port;
1152 serial = port->serial;
1154 mos7720_port = usb_get_serial_port_data(port);
1155 if (mos7720_port == NULL)
1158 if (break_state == -1)
1159 data = mos7720_port->shadowLCR | UART_LCR_SBC;
1161 data = mos7720_port->shadowLCR & ~UART_LCR_SBC;
1163 mos7720_port->shadowLCR = data;
1164 write_mos_reg(serial, port->number - port->serial->minor,
1165 LCR, mos7720_port->shadowLCR);
1169 * mos7720_write_room
1170 * this function is called by the tty driver when it wants to know how many
1171 * bytes of data we can accept for a specific port.
1172 * If successful, we return the amount of room that we have for this port
1173 * Otherwise we return a negative error number.
1175 static int mos7720_write_room(struct tty_struct *tty)
1177 struct usb_serial_port *port = tty->driver_data;
1178 struct moschip_port *mos7720_port;
1182 mos7720_port = usb_get_serial_port_data(port);
1183 if (mos7720_port == NULL)
1186 /* FIXME: Locking */
1187 for (i = 0; i < NUM_URBS; ++i) {
1188 if (mos7720_port->write_urb_pool[i] &&
1189 mos7720_port->write_urb_pool[i]->status != -EINPROGRESS)
1190 room += URB_TRANSFER_BUFFER_SIZE;
1193 dev_dbg(&port->dev, "%s - returns %d\n", __func__, room);
1197 static int mos7720_write(struct tty_struct *tty, struct usb_serial_port *port,
1198 const unsigned char *data, int count)
1205 struct moschip_port *mos7720_port;
1206 struct usb_serial *serial;
1208 const unsigned char *current_position = data;
1210 serial = port->serial;
1212 mos7720_port = usb_get_serial_port_data(port);
1213 if (mos7720_port == NULL)
1216 /* try to find a free urb in the list */
1219 for (i = 0; i < NUM_URBS; ++i) {
1220 if (mos7720_port->write_urb_pool[i] &&
1221 mos7720_port->write_urb_pool[i]->status != -EINPROGRESS) {
1222 urb = mos7720_port->write_urb_pool[i];
1223 dev_dbg(&port->dev, "URB:%d\n", i);
1229 dev_dbg(&port->dev, "%s - no more free urbs\n", __func__);
1233 if (urb->transfer_buffer == NULL) {
1234 urb->transfer_buffer = kmalloc(URB_TRANSFER_BUFFER_SIZE,
1236 if (urb->transfer_buffer == NULL) {
1237 dev_err_console(port, "%s no more kernel memory...\n",
1242 transfer_size = min(count, URB_TRANSFER_BUFFER_SIZE);
1244 memcpy(urb->transfer_buffer, current_position, transfer_size);
1245 usb_serial_debug_data(&port->dev, __func__, transfer_size,
1246 urb->transfer_buffer);
1248 /* fill urb with data and submit */
1249 usb_fill_bulk_urb(urb, serial->dev,
1250 usb_sndbulkpipe(serial->dev,
1251 port->bulk_out_endpointAddress),
1252 urb->transfer_buffer, transfer_size,
1253 mos7720_bulk_out_data_callback, mos7720_port);
1255 /* send it down the pipe */
1256 status = usb_submit_urb(urb, GFP_ATOMIC);
1258 dev_err_console(port, "%s - usb_submit_urb(write bulk) failed "
1259 "with status = %d\n", __func__, status);
1260 bytes_sent = status;
1263 bytes_sent = transfer_size;
1269 static void mos7720_throttle(struct tty_struct *tty)
1271 struct usb_serial_port *port = tty->driver_data;
1272 struct moschip_port *mos7720_port;
1275 mos7720_port = usb_get_serial_port_data(port);
1277 if (mos7720_port == NULL)
1280 if (!mos7720_port->open) {
1281 dev_dbg(&port->dev, "%s - port not opened\n", __func__);
1285 /* if we are implementing XON/XOFF, send the stop character */
1287 unsigned char stop_char = STOP_CHAR(tty);
1288 status = mos7720_write(tty, port, &stop_char, 1);
1293 /* if we are implementing RTS/CTS, toggle that line */
1294 if (tty->termios.c_cflag & CRTSCTS) {
1295 mos7720_port->shadowMCR &= ~UART_MCR_RTS;
1296 write_mos_reg(port->serial, port->number - port->serial->minor,
1297 MCR, mos7720_port->shadowMCR);
1303 static void mos7720_unthrottle(struct tty_struct *tty)
1305 struct usb_serial_port *port = tty->driver_data;
1306 struct moschip_port *mos7720_port = usb_get_serial_port_data(port);
1309 if (mos7720_port == NULL)
1312 if (!mos7720_port->open) {
1313 dev_dbg(&port->dev, "%s - port not opened\n", __func__);
1317 /* if we are implementing XON/XOFF, send the start character */
1319 unsigned char start_char = START_CHAR(tty);
1320 status = mos7720_write(tty, port, &start_char, 1);
1325 /* if we are implementing RTS/CTS, toggle that line */
1326 if (tty->termios.c_cflag & CRTSCTS) {
1327 mos7720_port->shadowMCR |= UART_MCR_RTS;
1328 write_mos_reg(port->serial, port->number - port->serial->minor,
1329 MCR, mos7720_port->shadowMCR);
1335 /* FIXME: this function does not work */
1336 static int set_higher_rates(struct moschip_port *mos7720_port,
1339 struct usb_serial_port *port;
1340 struct usb_serial *serial;
1342 enum mos_regs sp_reg;
1343 if (mos7720_port == NULL)
1346 port = mos7720_port->port;
1347 serial = port->serial;
1349 /***********************************************
1350 * Init Sequence for higher rates
1351 ***********************************************/
1352 dev_dbg(&port->dev, "Sending Setting Commands ..........\n");
1353 port_number = port->number - port->serial->minor;
1355 write_mos_reg(serial, port_number, IER, 0x00);
1356 write_mos_reg(serial, port_number, FCR, 0x00);
1357 write_mos_reg(serial, port_number, FCR, 0xcf);
1358 mos7720_port->shadowMCR = 0x0b;
1359 write_mos_reg(serial, port_number, MCR, mos7720_port->shadowMCR);
1360 write_mos_reg(serial, dummy, SP_CONTROL_REG, 0x00);
1362 /***********************************************
1363 * Set for higher rates *
1364 ***********************************************/
1365 /* writing baud rate verbatum into uart clock field clearly not right */
1366 if (port_number == 0)
1370 write_mos_reg(serial, dummy, sp_reg, baud * 0x10);
1371 write_mos_reg(serial, dummy, SP_CONTROL_REG, 0x03);
1372 mos7720_port->shadowMCR = 0x2b;
1373 write_mos_reg(serial, port_number, MCR, mos7720_port->shadowMCR);
1375 /***********************************************
1377 ***********************************************/
1378 mos7720_port->shadowLCR = mos7720_port->shadowLCR | UART_LCR_DLAB;
1379 write_mos_reg(serial, port_number, LCR, mos7720_port->shadowLCR);
1380 write_mos_reg(serial, port_number, DLL, 0x01);
1381 write_mos_reg(serial, port_number, DLM, 0x00);
1382 mos7720_port->shadowLCR = mos7720_port->shadowLCR & ~UART_LCR_DLAB;
1383 write_mos_reg(serial, port_number, LCR, mos7720_port->shadowLCR);
1388 /* baud rate information */
1389 struct divisor_table_entry {
1394 /* Define table of divisors for moschip 7720 hardware *
1395 * These assume a 3.6864MHz crystal, the standard /16, and *
1397 static struct divisor_table_entry divisor_table[] = {
1399 { 110, 1047}, /* 2094.545455 => 230450 => .0217 % over */
1400 { 134, 857}, /* 1713.011152 => 230398.5 => .00065% under */
1416 /*****************************************************************************
1417 * calc_baud_rate_divisor
1418 * this function calculates the proper baud rate divisor for the specified
1420 *****************************************************************************/
1421 static int calc_baud_rate_divisor(struct usb_serial_port *port, int baudrate, int *divisor)
1429 dev_dbg(&port->dev, "%s - %d\n", __func__, baudrate);
1431 for (i = 0; i < ARRAY_SIZE(divisor_table); i++) {
1432 if (divisor_table[i].baudrate == baudrate) {
1433 *divisor = divisor_table[i].divisor;
1438 /* After trying for all the standard baud rates *
1439 * Try calculating the divisor for this baud rate */
1440 if (baudrate > 75 && baudrate < 230400) {
1441 /* get the divisor */
1442 custom = (__u16)(230400L / baudrate);
1444 /* Check for round off */
1445 round1 = (__u16)(2304000L / baudrate);
1446 round = (__u16)(round1 - (custom * 10));
1451 dev_dbg(&port->dev, "Baud %d = %d\n", baudrate, custom);
1455 dev_dbg(&port->dev, "Baud calculation Failed...\n");
1460 * send_cmd_write_baud_rate
1461 * this function sends the proper command to change the baud rate of the
1464 static int send_cmd_write_baud_rate(struct moschip_port *mos7720_port,
1467 struct usb_serial_port *port;
1468 struct usb_serial *serial;
1471 unsigned char number;
1473 if (mos7720_port == NULL)
1476 port = mos7720_port->port;
1477 serial = port->serial;
1479 number = port->number - port->serial->minor;
1480 dev_dbg(&port->dev, "%s - baud = %d\n", __func__, baudrate);
1482 /* Calculate the Divisor */
1483 status = calc_baud_rate_divisor(port, baudrate, &divisor);
1485 dev_err(&port->dev, "%s - bad baud rate\n", __func__);
1489 /* Enable access to divisor latch */
1490 mos7720_port->shadowLCR = mos7720_port->shadowLCR | UART_LCR_DLAB;
1491 write_mos_reg(serial, number, LCR, mos7720_port->shadowLCR);
1493 /* Write the divisor */
1494 write_mos_reg(serial, number, DLL, (__u8)(divisor & 0xff));
1495 write_mos_reg(serial, number, DLM, (__u8)((divisor & 0xff00) >> 8));
1497 /* Disable access to divisor latch */
1498 mos7720_port->shadowLCR = mos7720_port->shadowLCR & ~UART_LCR_DLAB;
1499 write_mos_reg(serial, number, LCR, mos7720_port->shadowLCR);
1505 * change_port_settings
1506 * This routine is called to set the UART on the device to match
1507 * the specified new settings.
1509 static void change_port_settings(struct tty_struct *tty,
1510 struct moschip_port *mos7720_port,
1511 struct ktermios *old_termios)
1513 struct usb_serial_port *port;
1514 struct usb_serial *serial;
1525 if (mos7720_port == NULL)
1528 port = mos7720_port->port;
1529 serial = port->serial;
1530 port_number = port->number - port->serial->minor;
1532 if (!mos7720_port->open) {
1533 dev_dbg(&port->dev, "%s - port not opened\n", __func__);
1537 lData = UART_LCR_WLEN8;
1538 lStop = 0x00; /* 1 stop bit */
1539 lParity = 0x00; /* No parity */
1541 cflag = tty->termios.c_cflag;
1542 iflag = tty->termios.c_iflag;
1544 /* Change the number of bits */
1545 switch (cflag & CSIZE) {
1547 lData = UART_LCR_WLEN5;
1552 lData = UART_LCR_WLEN6;
1557 lData = UART_LCR_WLEN7;
1562 lData = UART_LCR_WLEN8;
1566 /* Change the Parity bit */
1567 if (cflag & PARENB) {
1568 if (cflag & PARODD) {
1569 lParity = UART_LCR_PARITY;
1570 dev_dbg(&port->dev, "%s - parity = odd\n", __func__);
1572 lParity = (UART_LCR_EPAR | UART_LCR_PARITY);
1573 dev_dbg(&port->dev, "%s - parity = even\n", __func__);
1577 dev_dbg(&port->dev, "%s - parity = none\n", __func__);
1581 lParity = lParity | 0x20;
1583 /* Change the Stop bit */
1584 if (cflag & CSTOPB) {
1585 lStop = UART_LCR_STOP;
1586 dev_dbg(&port->dev, "%s - stop bits = 2\n", __func__);
1589 dev_dbg(&port->dev, "%s - stop bits = 1\n", __func__);
1592 #define LCR_BITS_MASK 0x03 /* Mask for bits/char field */
1593 #define LCR_STOP_MASK 0x04 /* Mask for stop bits field */
1594 #define LCR_PAR_MASK 0x38 /* Mask for parity field */
1596 /* Update the LCR with the correct value */
1597 mos7720_port->shadowLCR &=
1598 ~(LCR_BITS_MASK | LCR_STOP_MASK | LCR_PAR_MASK);
1599 mos7720_port->shadowLCR |= (lData | lParity | lStop);
1602 /* Disable Interrupts */
1603 write_mos_reg(serial, port_number, IER, 0x00);
1604 write_mos_reg(serial, port_number, FCR, 0x00);
1605 write_mos_reg(serial, port_number, FCR, 0xcf);
1607 /* Send the updated LCR value to the mos7720 */
1608 write_mos_reg(serial, port_number, LCR, mos7720_port->shadowLCR);
1609 mos7720_port->shadowMCR = 0x0b;
1610 write_mos_reg(serial, port_number, MCR, mos7720_port->shadowMCR);
1612 /* set up the MCR register and send it to the mos7720 */
1613 mos7720_port->shadowMCR = UART_MCR_OUT2;
1615 mos7720_port->shadowMCR |= (UART_MCR_DTR | UART_MCR_RTS);
1617 if (cflag & CRTSCTS) {
1618 mos7720_port->shadowMCR |= (UART_MCR_XONANY);
1619 /* To set hardware flow control to the specified *
1620 * serial port, in SP1/2_CONTROL_REG */
1622 write_mos_reg(serial, dummy, SP_CONTROL_REG, 0x01);
1624 write_mos_reg(serial, dummy, SP_CONTROL_REG, 0x02);
1627 mos7720_port->shadowMCR &= ~(UART_MCR_XONANY);
1629 write_mos_reg(serial, port_number, MCR, mos7720_port->shadowMCR);
1631 /* Determine divisor based on baud rate */
1632 baud = tty_get_baud_rate(tty);
1634 /* pick a default, any default... */
1635 dev_dbg(&port->dev, "Picked default baud...\n");
1639 if (baud >= 230400) {
1640 set_higher_rates(mos7720_port, baud);
1641 /* Enable Interrupts */
1642 write_mos_reg(serial, port_number, IER, 0x0c);
1646 dev_dbg(&port->dev, "%s - baud rate = %d\n", __func__, baud);
1647 status = send_cmd_write_baud_rate(mos7720_port, baud);
1648 /* FIXME: needs to write actual resulting baud back not just
1651 tty_encode_baud_rate(tty, baud, baud);
1652 /* Enable Interrupts */
1653 write_mos_reg(serial, port_number, IER, 0x0c);
1655 if (port->read_urb->status != -EINPROGRESS) {
1656 status = usb_submit_urb(port->read_urb, GFP_ATOMIC);
1658 dev_dbg(&port->dev, "usb_submit_urb(read bulk) failed, status = %d\n", status);
1663 * mos7720_set_termios
1664 * this function is called by the tty driver when it wants to change the
1665 * termios structure.
1667 static void mos7720_set_termios(struct tty_struct *tty,
1668 struct usb_serial_port *port, struct ktermios *old_termios)
1672 struct usb_serial *serial;
1673 struct moschip_port *mos7720_port;
1675 serial = port->serial;
1677 mos7720_port = usb_get_serial_port_data(port);
1679 if (mos7720_port == NULL)
1682 if (!mos7720_port->open) {
1683 dev_dbg(&port->dev, "%s - port not opened\n", __func__);
1687 dev_dbg(&port->dev, "setting termios - ASPIRE\n");
1689 cflag = tty->termios.c_cflag;
1691 dev_dbg(&port->dev, "%s - cflag %08x iflag %08x\n", __func__,
1692 tty->termios.c_cflag, RELEVANT_IFLAG(tty->termios.c_iflag));
1694 dev_dbg(&port->dev, "%s - old cflag %08x old iflag %08x\n", __func__,
1695 old_termios->c_cflag, RELEVANT_IFLAG(old_termios->c_iflag));
1697 /* change the port settings to the new ones specified */
1698 change_port_settings(tty, mos7720_port, old_termios);
1700 if (port->read_urb->status != -EINPROGRESS) {
1701 status = usb_submit_urb(port->read_urb, GFP_ATOMIC);
1703 dev_dbg(&port->dev, "usb_submit_urb(read bulk) failed, status = %d\n", status);
1708 * get_lsr_info - get line status register info
1710 * Purpose: Let user call ioctl() to get info when the UART physically
1711 * is emptied. On bus types like RS485, the transmitter must
1712 * release the bus after transmitting. This must be done when
1713 * the transmit shift register is empty, not be done when the
1714 * transmit holding register is empty. This functionality
1715 * allows an RS485 driver to be written in user space.
1717 static int get_lsr_info(struct tty_struct *tty,
1718 struct moschip_port *mos7720_port, unsigned int __user *value)
1720 struct usb_serial_port *port = tty->driver_data;
1721 unsigned int result = 0;
1722 unsigned char data = 0;
1723 int port_number = port->number - port->serial->minor;
1726 count = mos7720_chars_in_buffer(tty);
1728 read_mos_reg(port->serial, port_number, LSR, &data);
1729 if ((data & (UART_LSR_TEMT | UART_LSR_THRE))
1730 == (UART_LSR_TEMT | UART_LSR_THRE)) {
1731 dev_dbg(&port->dev, "%s -- Empty\n", __func__);
1732 result = TIOCSER_TEMT;
1735 if (copy_to_user(value, &result, sizeof(int)))
1740 static int mos7720_tiocmget(struct tty_struct *tty)
1742 struct usb_serial_port *port = tty->driver_data;
1743 struct moschip_port *mos7720_port = usb_get_serial_port_data(port);
1744 unsigned int result = 0;
1748 mcr = mos7720_port->shadowMCR;
1749 msr = mos7720_port->shadowMSR;
1751 result = ((mcr & UART_MCR_DTR) ? TIOCM_DTR : 0) /* 0x002 */
1752 | ((mcr & UART_MCR_RTS) ? TIOCM_RTS : 0) /* 0x004 */
1753 | ((msr & UART_MSR_CTS) ? TIOCM_CTS : 0) /* 0x020 */
1754 | ((msr & UART_MSR_DCD) ? TIOCM_CAR : 0) /* 0x040 */
1755 | ((msr & UART_MSR_RI) ? TIOCM_RI : 0) /* 0x080 */
1756 | ((msr & UART_MSR_DSR) ? TIOCM_DSR : 0); /* 0x100 */
1761 static int mos7720_tiocmset(struct tty_struct *tty,
1762 unsigned int set, unsigned int clear)
1764 struct usb_serial_port *port = tty->driver_data;
1765 struct moschip_port *mos7720_port = usb_get_serial_port_data(port);
1768 mcr = mos7720_port->shadowMCR;
1770 if (set & TIOCM_RTS)
1771 mcr |= UART_MCR_RTS;
1772 if (set & TIOCM_DTR)
1773 mcr |= UART_MCR_DTR;
1774 if (set & TIOCM_LOOP)
1775 mcr |= UART_MCR_LOOP;
1777 if (clear & TIOCM_RTS)
1778 mcr &= ~UART_MCR_RTS;
1779 if (clear & TIOCM_DTR)
1780 mcr &= ~UART_MCR_DTR;
1781 if (clear & TIOCM_LOOP)
1782 mcr &= ~UART_MCR_LOOP;
1784 mos7720_port->shadowMCR = mcr;
1785 write_mos_reg(port->serial, port->number - port->serial->minor,
1786 MCR, mos7720_port->shadowMCR);
1791 static int set_modem_info(struct moschip_port *mos7720_port, unsigned int cmd,
1792 unsigned int __user *value)
1797 struct usb_serial_port *port;
1799 if (mos7720_port == NULL)
1802 port = (struct usb_serial_port *)mos7720_port->port;
1803 mcr = mos7720_port->shadowMCR;
1805 if (copy_from_user(&arg, value, sizeof(int)))
1810 if (arg & TIOCM_RTS)
1811 mcr |= UART_MCR_RTS;
1812 if (arg & TIOCM_DTR)
1813 mcr |= UART_MCR_RTS;
1814 if (arg & TIOCM_LOOP)
1815 mcr |= UART_MCR_LOOP;
1819 if (arg & TIOCM_RTS)
1820 mcr &= ~UART_MCR_RTS;
1821 if (arg & TIOCM_DTR)
1822 mcr &= ~UART_MCR_RTS;
1823 if (arg & TIOCM_LOOP)
1824 mcr &= ~UART_MCR_LOOP;
1829 mos7720_port->shadowMCR = mcr;
1830 write_mos_reg(port->serial, port->number - port->serial->minor,
1831 MCR, mos7720_port->shadowMCR);
1836 static int get_serial_info(struct moschip_port *mos7720_port,
1837 struct serial_struct __user *retinfo)
1839 struct serial_struct tmp;
1844 memset(&tmp, 0, sizeof(tmp));
1846 tmp.type = PORT_16550A;
1847 tmp.line = mos7720_port->port->serial->minor;
1848 tmp.port = mos7720_port->port->number;
1850 tmp.flags = ASYNC_SKIP_TEST | ASYNC_AUTO_IRQ;
1851 tmp.xmit_fifo_size = NUM_URBS * URB_TRANSFER_BUFFER_SIZE;
1852 tmp.baud_base = 9600;
1853 tmp.close_delay = 5*HZ;
1854 tmp.closing_wait = 30*HZ;
1856 if (copy_to_user(retinfo, &tmp, sizeof(*retinfo)))
1861 static int mos7720_ioctl(struct tty_struct *tty,
1862 unsigned int cmd, unsigned long arg)
1864 struct usb_serial_port *port = tty->driver_data;
1865 struct moschip_port *mos7720_port;
1867 mos7720_port = usb_get_serial_port_data(port);
1868 if (mos7720_port == NULL)
1871 dev_dbg(&port->dev, "%s - cmd = 0x%x", __func__, cmd);
1875 dev_dbg(&port->dev, "%s TIOCSERGETLSR\n", __func__);
1876 return get_lsr_info(tty, mos7720_port,
1877 (unsigned int __user *)arg);
1879 /* FIXME: These should be using the mode methods */
1882 dev_dbg(&port->dev, "%s TIOCMSET/TIOCMBIC/TIOCMSET\n", __func__);
1883 return set_modem_info(mos7720_port, cmd,
1884 (unsigned int __user *)arg);
1887 dev_dbg(&port->dev, "%s TIOCGSERIAL\n", __func__);
1888 return get_serial_info(mos7720_port,
1889 (struct serial_struct __user *)arg);
1892 return -ENOIOCTLCMD;
1895 static int mos7720_startup(struct usb_serial *serial)
1897 struct usb_device *dev;
1902 product = le16_to_cpu(serial->dev->descriptor.idProduct);
1906 * The 7715 uses the first bulk in/out endpoint pair for the parallel
1907 * port, and the second for the serial port. Because the usbserial core
1908 * assumes both pairs are serial ports, we must engage in a bit of
1909 * subterfuge and swap the pointers for ports 0 and 1 in order to make
1910 * port 0 point to the serial port. However, both moschip devices use a
1911 * single interrupt-in endpoint for both ports (as mentioned a little
1912 * further down), and this endpoint was assigned to port 0. So after
1913 * the swap, we must copy the interrupt endpoint elements from port 1
1914 * (as newly assigned) to port 0, and null out port 1 pointers.
1916 if (product == MOSCHIP_DEVICE_ID_7715) {
1917 struct usb_serial_port *tmp = serial->port[0];
1918 serial->port[0] = serial->port[1];
1919 serial->port[1] = tmp;
1920 serial->port[0]->interrupt_in_urb = tmp->interrupt_in_urb;
1921 serial->port[0]->interrupt_in_buffer = tmp->interrupt_in_buffer;
1922 serial->port[0]->interrupt_in_endpointAddress =
1923 tmp->interrupt_in_endpointAddress;
1924 serial->port[1]->interrupt_in_urb = NULL;
1925 serial->port[1]->interrupt_in_buffer = NULL;
1928 /* setting configuration feature to one */
1929 usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0),
1930 (__u8)0x03, 0x00, 0x01, 0x00, NULL, 0x00, 5*HZ);
1932 /* start the interrupt urb */
1933 ret_val = usb_submit_urb(serial->port[0]->interrupt_in_urb, GFP_KERNEL);
1936 "%s - Error %d submitting control urb\n",
1939 #ifdef CONFIG_USB_SERIAL_MOS7715_PARPORT
1940 if (product == MOSCHIP_DEVICE_ID_7715) {
1941 ret_val = mos7715_parport_init(serial);
1946 /* LSR For Port 1 */
1947 read_mos_reg(serial, 0, LSR, &data);
1948 dev_dbg(&dev->dev, "LSR:%x\n", data);
1953 static void mos7720_release(struct usb_serial *serial)
1955 #ifdef CONFIG_USB_SERIAL_MOS7715_PARPORT
1956 /* close the parallel port */
1958 if (le16_to_cpu(serial->dev->descriptor.idProduct)
1959 == MOSCHIP_DEVICE_ID_7715) {
1960 struct urbtracker *urbtrack;
1961 unsigned long flags;
1962 struct mos7715_parport *mos_parport =
1963 usb_get_serial_data(serial);
1965 /* prevent NULL ptr dereference in port callbacks */
1966 spin_lock(&release_lock);
1967 mos_parport->pp->private_data = NULL;
1968 spin_unlock(&release_lock);
1970 /* wait for synchronous usb calls to return */
1971 if (mos_parport->msg_pending)
1972 wait_for_completion_timeout(&mos_parport->syncmsg_compl,
1975 parport_remove_port(mos_parport->pp);
1976 usb_set_serial_data(serial, NULL);
1977 mos_parport->serial = NULL;
1979 /* if tasklet currently scheduled, wait for it to complete */
1980 tasklet_kill(&mos_parport->urb_tasklet);
1982 /* unlink any urbs sent by the tasklet */
1983 spin_lock_irqsave(&mos_parport->listlock, flags);
1984 list_for_each_entry(urbtrack,
1985 &mos_parport->active_urbs,
1987 usb_unlink_urb(urbtrack->urb);
1988 spin_unlock_irqrestore(&mos_parport->listlock, flags);
1990 kref_put(&mos_parport->ref_count, destroy_mos_parport);
1995 static int mos7720_port_probe(struct usb_serial_port *port)
1997 struct moschip_port *mos7720_port;
1999 mos7720_port = kzalloc(sizeof(*mos7720_port), GFP_KERNEL);
2003 /* Initialize all port interrupt end point to port 0 int endpoint.
2004 * Our device has only one interrupt endpoint common to all ports.
2006 port->interrupt_in_endpointAddress =
2007 port->serial->port[0]->interrupt_in_endpointAddress;
2008 mos7720_port->port = port;
2010 usb_set_serial_port_data(port, mos7720_port);
2015 static int mos7720_port_remove(struct usb_serial_port *port)
2017 struct moschip_port *mos7720_port;
2019 mos7720_port = usb_get_serial_port_data(port);
2020 kfree(mos7720_port);
2025 static struct usb_serial_driver moschip7720_2port_driver = {
2027 .owner = THIS_MODULE,
2028 .name = "moschip7720",
2030 .description = "Moschip 2 port adapter",
2031 .id_table = id_table,
2032 .calc_num_ports = mos77xx_calc_num_ports,
2033 .open = mos7720_open,
2034 .close = mos7720_close,
2035 .throttle = mos7720_throttle,
2036 .unthrottle = mos7720_unthrottle,
2037 .probe = mos77xx_probe,
2038 .attach = mos7720_startup,
2039 .release = mos7720_release,
2040 .port_probe = mos7720_port_probe,
2041 .port_remove = mos7720_port_remove,
2042 .ioctl = mos7720_ioctl,
2043 .tiocmget = mos7720_tiocmget,
2044 .tiocmset = mos7720_tiocmset,
2045 .set_termios = mos7720_set_termios,
2046 .write = mos7720_write,
2047 .write_room = mos7720_write_room,
2048 .chars_in_buffer = mos7720_chars_in_buffer,
2049 .break_ctl = mos7720_break,
2050 .read_bulk_callback = mos7720_bulk_in_callback,
2051 .read_int_callback = NULL /* dynamically assigned in probe() */
2054 static struct usb_serial_driver * const serial_drivers[] = {
2055 &moschip7720_2port_driver, NULL
2058 module_usb_serial_driver(serial_drivers, id_table);
2060 MODULE_AUTHOR(DRIVER_AUTHOR);
2061 MODULE_DESCRIPTION(DRIVER_DESC);
2062 MODULE_LICENSE("GPL");