3 * Controls the Moschip 7720 usb to dual port serial converter
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/slab.h>
26 #include <linux/tty.h>
27 #include <linux/tty_driver.h>
28 #include <linux/tty_flip.h>
29 #include <linux/module.h>
30 #include <linux/spinlock.h>
31 #include <linux/serial.h>
32 #include <linux/serial_reg.h>
33 #include <linux/usb.h>
34 #include <linux/usb/serial.h>
35 #include <linux/uaccess.h>
36 #include <linux/parport.h>
38 #define DRIVER_AUTHOR "Aspire Communications pvt Ltd."
39 #define DRIVER_DESC "Moschip USB Serial Driver"
41 /* default urb timeout */
42 #define MOS_WDR_TIMEOUT 5000
44 #define MOS_MAX_PORT 0x02
45 #define MOS_WRITE 0x0E
48 /* Interrupt Routines Defines */
49 #define SERIAL_IIR_RLS 0x06
50 #define SERIAL_IIR_RDA 0x04
51 #define SERIAL_IIR_CTI 0x0c
52 #define SERIAL_IIR_THR 0x02
53 #define SERIAL_IIR_MS 0x00
55 #define NUM_URBS 16 /* URB Count */
56 #define URB_TRANSFER_BUFFER_SIZE 32 /* URB Size */
58 /* This structure holds all of the local serial port information */
60 __u8 shadowLCR; /* last LCR value received */
61 __u8 shadowMCR; /* last MCR value received */
62 __u8 shadowMSR; /* last MSR value received */
64 struct usb_serial_port *port; /* loop back to the owner */
65 struct urb *write_urb_pool[NUM_URBS];
68 #define USB_VENDOR_ID_MOSCHIP 0x9710
69 #define MOSCHIP_DEVICE_ID_7720 0x7720
70 #define MOSCHIP_DEVICE_ID_7715 0x7715
72 static const struct usb_device_id id_table[] = {
73 { USB_DEVICE(USB_VENDOR_ID_MOSCHIP, MOSCHIP_DEVICE_ID_7720) },
74 { USB_DEVICE(USB_VENDOR_ID_MOSCHIP, MOSCHIP_DEVICE_ID_7715) },
75 { } /* terminating entry */
77 MODULE_DEVICE_TABLE(usb, id_table);
79 #ifdef CONFIG_USB_SERIAL_MOS7715_PARPORT
81 /* initial values for parport regs */
82 #define DCR_INIT_VAL 0x0c /* SLCTIN, nINIT */
83 #define ECR_INIT_VAL 0x00 /* SPP mode */
86 struct mos7715_parport *mos_parport;
87 struct list_head urblist_entry;
88 struct kref ref_count;
90 struct usb_ctrlrequest *setup;
93 enum mos7715_pp_modes {
95 PS2 = 1<<5, /* moschip calls this 'NIBBLE' mode */
96 PPF = 2<<5, /* moschip calls this 'CB-FIFO mode */
99 struct mos7715_parport {
100 struct parport *pp; /* back to containing struct */
101 struct kref ref_count; /* to instance of this struct */
102 struct list_head deferred_urbs; /* list deferred async urbs */
103 struct list_head active_urbs; /* list async urbs in flight */
104 spinlock_t listlock; /* protects list access */
105 bool msg_pending; /* usb sync call pending */
106 struct completion syncmsg_compl; /* usb sync call completed */
107 struct tasklet_struct urb_tasklet; /* for sending deferred urbs */
108 struct usb_serial *serial; /* back to containing struct */
109 __u8 shadowECR; /* parallel port regs... */
111 atomic_t shadowDSR; /* updated in int-in callback */
114 /* lock guards against dereferencing NULL ptr in parport ops callbacks */
115 static DEFINE_SPINLOCK(release_lock);
117 #endif /* CONFIG_USB_SERIAL_MOS7715_PARPORT */
119 static const unsigned int dummy; /* for clarity in register access fns */
122 MOS7720_THR, /* serial port regs */
134 MOS7720_DPR, /* parallel port regs */
138 MOS7720_SP1_REG, /* device control regs */
139 MOS7720_SP2_REG, /* serial port 2 (7720 only) */
141 MOS7720_SP_CONTROL_REG,
145 * Return the correct value for the Windex field of the setup packet
146 * for a control endpoint message. See the 7715 datasheet.
148 static inline __u16 get_reg_index(enum mos_regs reg)
150 static const __u16 mos7715_index_lookup_table[] = {
151 0x00, /* MOS7720_THR */
152 0x00, /* MOS7720_RHR */
153 0x01, /* MOS7720_IER */
154 0x02, /* MOS7720_FCR */
155 0x02, /* MOS7720_ISR */
156 0x03, /* MOS7720_LCR */
157 0x04, /* MOS7720_MCR */
158 0x05, /* MOS7720_LSR */
159 0x06, /* MOS7720_MSR */
160 0x07, /* MOS7720_SPR */
161 0x00, /* MOS7720_DLL */
162 0x01, /* MOS7720_DLM */
163 0x00, /* MOS7720_DPR */
164 0x01, /* MOS7720_DSR */
165 0x02, /* MOS7720_DCR */
166 0x0a, /* MOS7720_ECR */
167 0x01, /* MOS7720_SP1_REG */
168 0x02, /* MOS7720_SP2_REG (7720 only) */
169 0x04, /* MOS7720_PP_REG (7715 only) */
170 0x08, /* MOS7720_SP_CONTROL_REG */
172 return mos7715_index_lookup_table[reg];
176 * Return the correct value for the upper byte of the Wvalue field of
177 * the setup packet for a control endpoint message.
179 static inline __u16 get_reg_value(enum mos_regs reg,
180 unsigned int serial_portnum)
182 if (reg >= MOS7720_SP1_REG) /* control reg */
185 else if (reg >= MOS7720_DPR) /* parallel port reg (7715 only) */
188 else /* serial port reg */
189 return (serial_portnum + 2) << 8;
193 * Write data byte to the specified device register. The data is embedded in
194 * the value field of the setup packet. serial_portnum is ignored for registers
195 * not specific to a particular serial port.
197 static int write_mos_reg(struct usb_serial *serial, unsigned int serial_portnum,
198 enum mos_regs reg, __u8 data)
200 struct usb_device *usbdev = serial->dev;
201 unsigned int pipe = usb_sndctrlpipe(usbdev, 0);
202 __u8 request = (__u8)0x0e;
203 __u8 requesttype = (__u8)0x40;
204 __u16 index = get_reg_index(reg);
205 __u16 value = get_reg_value(reg, serial_portnum) + data;
206 int status = usb_control_msg(usbdev, pipe, request, requesttype, value,
207 index, NULL, 0, MOS_WDR_TIMEOUT);
209 dev_err(&usbdev->dev,
210 "mos7720: usb_control_msg() failed: %d\n", status);
215 * Read data byte from the specified device register. The data returned by the
216 * device is embedded in the value field of the setup packet. serial_portnum is
217 * ignored for registers that are not specific to a particular serial port.
219 static int read_mos_reg(struct usb_serial *serial, unsigned int serial_portnum,
220 enum mos_regs reg, __u8 *data)
222 struct usb_device *usbdev = serial->dev;
223 unsigned int pipe = usb_rcvctrlpipe(usbdev, 0);
224 __u8 request = (__u8)0x0d;
225 __u8 requesttype = (__u8)0xc0;
226 __u16 index = get_reg_index(reg);
227 __u16 value = get_reg_value(reg, serial_portnum);
231 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\n", status);
254 #ifdef CONFIG_USB_SERIAL_MOS7715_PARPORT
256 static inline int mos7715_change_mode(struct mos7715_parport *mos_parport,
257 enum mos7715_pp_modes mode)
259 mos_parport->shadowECR = mode;
260 write_mos_reg(mos_parport->serial, dummy, MOS7720_ECR,
261 mos_parport->shadowECR);
265 static void destroy_mos_parport(struct kref *kref)
267 struct mos7715_parport *mos_parport =
268 container_of(kref, struct mos7715_parport, ref_count);
273 static void destroy_urbtracker(struct kref *kref)
275 struct urbtracker *urbtrack =
276 container_of(kref, struct urbtracker, ref_count);
277 struct mos7715_parport *mos_parport = urbtrack->mos_parport;
279 usb_free_urb(urbtrack->urb);
280 kfree(urbtrack->setup);
282 kref_put(&mos_parport->ref_count, destroy_mos_parport);
286 * This runs as a tasklet when sending an urb in a non-blocking parallel
287 * port callback had to be deferred because the disconnect mutex could not be
288 * obtained at the time.
290 static void send_deferred_urbs(unsigned long _mos_parport)
294 struct mos7715_parport *mos_parport = (void *)_mos_parport;
295 struct urbtracker *urbtrack, *tmp;
296 struct list_head *cursor, *next;
299 /* if release function ran, game over */
300 if (unlikely(mos_parport->serial == NULL))
303 dev = &mos_parport->serial->dev->dev;
305 /* try again to get the mutex */
306 if (!mutex_trylock(&mos_parport->serial->disc_mutex)) {
307 dev_dbg(dev, "%s: rescheduling tasklet\n", __func__);
308 tasklet_schedule(&mos_parport->urb_tasklet);
312 /* if device disconnected, game over */
313 if (unlikely(mos_parport->serial->disconnected)) {
314 mutex_unlock(&mos_parport->serial->disc_mutex);
318 spin_lock_irqsave(&mos_parport->listlock, flags);
319 if (list_empty(&mos_parport->deferred_urbs)) {
320 spin_unlock_irqrestore(&mos_parport->listlock, flags);
321 mutex_unlock(&mos_parport->serial->disc_mutex);
322 dev_dbg(dev, "%s: deferred_urbs list empty\n", __func__);
326 /* move contents of deferred_urbs list to active_urbs list and submit */
327 list_for_each_safe(cursor, next, &mos_parport->deferred_urbs)
328 list_move_tail(cursor, &mos_parport->active_urbs);
329 list_for_each_entry_safe(urbtrack, tmp, &mos_parport->active_urbs,
331 ret_val = usb_submit_urb(urbtrack->urb, GFP_ATOMIC);
332 dev_dbg(dev, "%s: urb submitted\n", __func__);
334 dev_err(dev, "usb_submit_urb() failed: %d\n", ret_val);
335 list_del(&urbtrack->urblist_entry);
336 kref_put(&urbtrack->ref_count, destroy_urbtracker);
339 spin_unlock_irqrestore(&mos_parport->listlock, flags);
340 mutex_unlock(&mos_parport->serial->disc_mutex);
343 /* callback for parallel port control urbs submitted asynchronously */
344 static void async_complete(struct urb *urb)
346 struct urbtracker *urbtrack = urb->context;
347 int status = urb->status;
349 if (unlikely(status))
350 dev_dbg(&urb->dev->dev, "%s - nonzero urb status received: %d\n", __func__, status);
352 /* remove the urbtracker from the active_urbs list */
353 spin_lock(&urbtrack->mos_parport->listlock);
354 list_del(&urbtrack->urblist_entry);
355 spin_unlock(&urbtrack->mos_parport->listlock);
356 kref_put(&urbtrack->ref_count, destroy_urbtracker);
359 static int write_parport_reg_nonblock(struct mos7715_parport *mos_parport,
360 enum mos_regs reg, __u8 data)
362 struct urbtracker *urbtrack;
365 struct usb_serial *serial = mos_parport->serial;
366 struct usb_device *usbdev = serial->dev;
368 /* create and initialize the control urb and containing urbtracker */
369 urbtrack = kmalloc(sizeof(struct urbtracker), GFP_ATOMIC);
373 urbtrack->urb = usb_alloc_urb(0, GFP_ATOMIC);
374 if (!urbtrack->urb) {
378 urbtrack->setup = kmalloc(sizeof(*urbtrack->setup), GFP_ATOMIC);
379 if (!urbtrack->setup) {
380 usb_free_urb(urbtrack->urb);
384 urbtrack->setup->bRequestType = (__u8)0x40;
385 urbtrack->setup->bRequest = (__u8)0x0e;
386 urbtrack->setup->wValue = cpu_to_le16(get_reg_value(reg, dummy));
387 urbtrack->setup->wIndex = cpu_to_le16(get_reg_index(reg));
388 urbtrack->setup->wLength = 0;
389 usb_fill_control_urb(urbtrack->urb, usbdev,
390 usb_sndctrlpipe(usbdev, 0),
391 (unsigned char *)urbtrack->setup,
392 NULL, 0, async_complete, urbtrack);
393 kref_get(&mos_parport->ref_count);
394 urbtrack->mos_parport = mos_parport;
395 kref_init(&urbtrack->ref_count);
396 INIT_LIST_HEAD(&urbtrack->urblist_entry);
399 * get the disconnect mutex, or add tracker to the deferred_urbs list
400 * and schedule a tasklet to try again later
402 if (!mutex_trylock(&serial->disc_mutex)) {
403 spin_lock_irqsave(&mos_parport->listlock, flags);
404 list_add_tail(&urbtrack->urblist_entry,
405 &mos_parport->deferred_urbs);
406 spin_unlock_irqrestore(&mos_parport->listlock, flags);
407 tasklet_schedule(&mos_parport->urb_tasklet);
408 dev_dbg(&usbdev->dev, "tasklet scheduled\n");
412 /* bail if device disconnected */
413 if (serial->disconnected) {
414 kref_put(&urbtrack->ref_count, destroy_urbtracker);
415 mutex_unlock(&serial->disc_mutex);
419 /* add the tracker to the active_urbs list and submit */
420 spin_lock_irqsave(&mos_parport->listlock, flags);
421 list_add_tail(&urbtrack->urblist_entry, &mos_parport->active_urbs);
422 spin_unlock_irqrestore(&mos_parport->listlock, flags);
423 ret_val = usb_submit_urb(urbtrack->urb, GFP_ATOMIC);
424 mutex_unlock(&serial->disc_mutex);
426 dev_err(&usbdev->dev,
427 "%s: submit_urb() failed: %d\n", __func__, ret_val);
428 spin_lock_irqsave(&mos_parport->listlock, flags);
429 list_del(&urbtrack->urblist_entry);
430 spin_unlock_irqrestore(&mos_parport->listlock, flags);
431 kref_put(&urbtrack->ref_count, destroy_urbtracker);
438 * This is the the common top part of all parallel port callback operations that
439 * send synchronous messages to the device. This implements convoluted locking
440 * that avoids two scenarios: (1) a port operation is called after usbserial
441 * has called our release function, at which point struct mos7715_parport has
442 * been destroyed, and (2) the device has been disconnected, but usbserial has
443 * not called the release function yet because someone has a serial port open.
444 * The shared release_lock prevents the first, and the mutex and disconnected
445 * flag maintained by usbserial covers the second. We also use the msg_pending
446 * flag to ensure that all synchronous usb message calls have completed before
447 * our release function can return.
449 static int parport_prologue(struct parport *pp)
451 struct mos7715_parport *mos_parport;
453 spin_lock(&release_lock);
454 mos_parport = pp->private_data;
455 if (unlikely(mos_parport == NULL)) {
456 /* release fn called, port struct destroyed */
457 spin_unlock(&release_lock);
460 mos_parport->msg_pending = true; /* synch usb call pending */
461 reinit_completion(&mos_parport->syncmsg_compl);
462 spin_unlock(&release_lock);
464 mutex_lock(&mos_parport->serial->disc_mutex);
465 if (mos_parport->serial->disconnected) {
466 /* device disconnected */
467 mutex_unlock(&mos_parport->serial->disc_mutex);
468 mos_parport->msg_pending = false;
469 complete(&mos_parport->syncmsg_compl);
477 * This is the common bottom part of all parallel port functions that send
478 * synchronous messages to the device.
480 static inline void parport_epilogue(struct parport *pp)
482 struct mos7715_parport *mos_parport = pp->private_data;
483 mutex_unlock(&mos_parport->serial->disc_mutex);
484 mos_parport->msg_pending = false;
485 complete(&mos_parport->syncmsg_compl);
488 static void parport_mos7715_write_data(struct parport *pp, unsigned char d)
490 struct mos7715_parport *mos_parport = pp->private_data;
492 if (parport_prologue(pp) < 0)
494 mos7715_change_mode(mos_parport, SPP);
495 write_mos_reg(mos_parport->serial, dummy, MOS7720_DPR, (__u8)d);
496 parport_epilogue(pp);
499 static unsigned char parport_mos7715_read_data(struct parport *pp)
501 struct mos7715_parport *mos_parport = pp->private_data;
504 if (parport_prologue(pp) < 0)
506 read_mos_reg(mos_parport->serial, dummy, MOS7720_DPR, &d);
507 parport_epilogue(pp);
511 static void parport_mos7715_write_control(struct parport *pp, unsigned char d)
513 struct mos7715_parport *mos_parport = pp->private_data;
516 if (parport_prologue(pp) < 0)
518 data = ((__u8)d & 0x0f) | (mos_parport->shadowDCR & 0xf0);
519 write_mos_reg(mos_parport->serial, dummy, MOS7720_DCR, data);
520 mos_parport->shadowDCR = data;
521 parport_epilogue(pp);
524 static unsigned char parport_mos7715_read_control(struct parport *pp)
526 struct mos7715_parport *mos_parport = pp->private_data;
529 spin_lock(&release_lock);
530 mos_parport = pp->private_data;
531 if (unlikely(mos_parport == NULL)) {
532 spin_unlock(&release_lock);
535 dcr = mos_parport->shadowDCR & 0x0f;
536 spin_unlock(&release_lock);
540 static unsigned char parport_mos7715_frob_control(struct parport *pp,
544 struct mos7715_parport *mos_parport = pp->private_data;
549 if (parport_prologue(pp) < 0)
551 mos_parport->shadowDCR = (mos_parport->shadowDCR & (~mask)) ^ val;
552 write_mos_reg(mos_parport->serial, dummy, MOS7720_DCR,
553 mos_parport->shadowDCR);
554 dcr = mos_parport->shadowDCR & 0x0f;
555 parport_epilogue(pp);
559 static unsigned char parport_mos7715_read_status(struct parport *pp)
561 unsigned char status;
562 struct mos7715_parport *mos_parport = pp->private_data;
564 spin_lock(&release_lock);
565 mos_parport = pp->private_data;
566 if (unlikely(mos_parport == NULL)) { /* release called */
567 spin_unlock(&release_lock);
570 status = atomic_read(&mos_parport->shadowDSR) & 0xf8;
571 spin_unlock(&release_lock);
575 static void parport_mos7715_enable_irq(struct parport *pp)
579 static void parport_mos7715_disable_irq(struct parport *pp)
583 static void parport_mos7715_data_forward(struct parport *pp)
585 struct mos7715_parport *mos_parport = pp->private_data;
587 if (parport_prologue(pp) < 0)
589 mos7715_change_mode(mos_parport, PS2);
590 mos_parport->shadowDCR &= ~0x20;
591 write_mos_reg(mos_parport->serial, dummy, MOS7720_DCR,
592 mos_parport->shadowDCR);
593 parport_epilogue(pp);
596 static void parport_mos7715_data_reverse(struct parport *pp)
598 struct mos7715_parport *mos_parport = pp->private_data;
600 if (parport_prologue(pp) < 0)
602 mos7715_change_mode(mos_parport, PS2);
603 mos_parport->shadowDCR |= 0x20;
604 write_mos_reg(mos_parport->serial, dummy, MOS7720_DCR,
605 mos_parport->shadowDCR);
606 parport_epilogue(pp);
609 static void parport_mos7715_init_state(struct pardevice *dev,
610 struct parport_state *s)
612 s->u.pc.ctr = DCR_INIT_VAL;
613 s->u.pc.ecr = ECR_INIT_VAL;
616 /* N.B. Parport core code requires that this function not block */
617 static void parport_mos7715_save_state(struct parport *pp,
618 struct parport_state *s)
620 struct mos7715_parport *mos_parport;
622 spin_lock(&release_lock);
623 mos_parport = pp->private_data;
624 if (unlikely(mos_parport == NULL)) { /* release called */
625 spin_unlock(&release_lock);
628 s->u.pc.ctr = mos_parport->shadowDCR;
629 s->u.pc.ecr = mos_parport->shadowECR;
630 spin_unlock(&release_lock);
633 /* N.B. Parport core code requires that this function not block */
634 static void parport_mos7715_restore_state(struct parport *pp,
635 struct parport_state *s)
637 struct mos7715_parport *mos_parport;
639 spin_lock(&release_lock);
640 mos_parport = pp->private_data;
641 if (unlikely(mos_parport == NULL)) { /* release called */
642 spin_unlock(&release_lock);
645 mos_parport->shadowDCR = s->u.pc.ctr;
646 mos_parport->shadowECR = s->u.pc.ecr;
647 write_parport_reg_nonblock(mos_parport, MOS7720_DCR,
648 mos_parport->shadowDCR);
649 write_parport_reg_nonblock(mos_parport, MOS7720_ECR,
650 mos_parport->shadowECR);
651 spin_unlock(&release_lock);
654 static size_t parport_mos7715_write_compat(struct parport *pp,
656 size_t len, int flags)
659 struct mos7715_parport *mos_parport = pp->private_data;
662 if (parport_prologue(pp) < 0)
664 mos7715_change_mode(mos_parport, PPF);
665 retval = usb_bulk_msg(mos_parport->serial->dev,
666 usb_sndbulkpipe(mos_parport->serial->dev, 2),
667 (void *)buffer, len, &actual_len,
669 parport_epilogue(pp);
671 dev_err(&mos_parport->serial->dev->dev,
672 "mos7720: usb_bulk_msg() failed: %d\n", retval);
678 static struct parport_operations parport_mos7715_ops = {
679 .owner = THIS_MODULE,
680 .write_data = parport_mos7715_write_data,
681 .read_data = parport_mos7715_read_data,
683 .write_control = parport_mos7715_write_control,
684 .read_control = parport_mos7715_read_control,
685 .frob_control = parport_mos7715_frob_control,
687 .read_status = parport_mos7715_read_status,
689 .enable_irq = parport_mos7715_enable_irq,
690 .disable_irq = parport_mos7715_disable_irq,
692 .data_forward = parport_mos7715_data_forward,
693 .data_reverse = parport_mos7715_data_reverse,
695 .init_state = parport_mos7715_init_state,
696 .save_state = parport_mos7715_save_state,
697 .restore_state = parport_mos7715_restore_state,
699 .compat_write_data = parport_mos7715_write_compat,
701 .nibble_read_data = parport_ieee1284_read_nibble,
702 .byte_read_data = parport_ieee1284_read_byte,
706 * Allocate and initialize parallel port control struct, initialize
707 * the parallel port hardware device, and register with the parport subsystem.
709 static int mos7715_parport_init(struct usb_serial *serial)
711 struct mos7715_parport *mos_parport;
713 /* allocate and initialize parallel port control struct */
714 mos_parport = kzalloc(sizeof(struct mos7715_parport), GFP_KERNEL);
718 mos_parport->msg_pending = false;
719 kref_init(&mos_parport->ref_count);
720 spin_lock_init(&mos_parport->listlock);
721 INIT_LIST_HEAD(&mos_parport->active_urbs);
722 INIT_LIST_HEAD(&mos_parport->deferred_urbs);
723 usb_set_serial_data(serial, mos_parport); /* hijack private pointer */
724 mos_parport->serial = serial;
725 tasklet_init(&mos_parport->urb_tasklet, send_deferred_urbs,
726 (unsigned long) mos_parport);
727 init_completion(&mos_parport->syncmsg_compl);
729 /* cycle parallel port reset bit */
730 write_mos_reg(mos_parport->serial, dummy, MOS7720_PP_REG, (__u8)0x80);
731 write_mos_reg(mos_parport->serial, dummy, MOS7720_PP_REG, (__u8)0x00);
733 /* initialize device registers */
734 mos_parport->shadowDCR = DCR_INIT_VAL;
735 write_mos_reg(mos_parport->serial, dummy, MOS7720_DCR,
736 mos_parport->shadowDCR);
737 mos_parport->shadowECR = ECR_INIT_VAL;
738 write_mos_reg(mos_parport->serial, dummy, MOS7720_ECR,
739 mos_parport->shadowECR);
741 /* register with parport core */
742 mos_parport->pp = parport_register_port(0, PARPORT_IRQ_NONE,
744 &parport_mos7715_ops);
745 if (mos_parport->pp == NULL) {
746 dev_err(&serial->interface->dev,
747 "Could not register parport\n");
748 kref_put(&mos_parport->ref_count, destroy_mos_parport);
751 mos_parport->pp->private_data = mos_parport;
752 mos_parport->pp->modes = PARPORT_MODE_COMPAT | PARPORT_MODE_PCSPP;
753 mos_parport->pp->dev = &serial->interface->dev;
754 parport_announce_port(mos_parport->pp);
758 #endif /* CONFIG_USB_SERIAL_MOS7715_PARPORT */
761 * mos7720_interrupt_callback
762 * this is the callback function for when we have received data on the
763 * interrupt endpoint.
765 static void mos7720_interrupt_callback(struct urb *urb)
769 int status = urb->status;
770 struct device *dev = &urb->dev->dev;
782 /* this urb is terminated, clean up */
783 dev_dbg(dev, "%s - urb shutting down with status: %d\n", __func__, status);
786 dev_dbg(dev, "%s - nonzero urb status received: %d\n", __func__, status);
790 length = urb->actual_length;
791 data = urb->transfer_buffer;
793 /* Moschip get 4 bytes
794 * Byte 1 IIR Port 1 (port.number is 0)
795 * Byte 2 IIR Port 2 (port.number is 1)
796 * Byte 3 --------------
797 * Byte 4 FIFO status for both */
799 /* the above description is inverted
800 * oneukum 2007-03-14 */
802 if (unlikely(length != 4)) {
803 dev_dbg(dev, "Wrong data !!!\n");
810 if ((sp1 | sp2) & 0x01) {
811 /* No Interrupt Pending in both the ports */
812 dev_dbg(dev, "No Interrupt !!!\n");
814 switch (sp1 & 0x0f) {
816 dev_dbg(dev, "Serial Port 1: Receiver status error or address bit detected in 9-bit mode\n");
819 dev_dbg(dev, "Serial Port 1: Receiver time out\n");
822 /* dev_dbg(dev, "Serial Port 1: Modem status change\n"); */
826 switch (sp2 & 0x0f) {
828 dev_dbg(dev, "Serial Port 2: Receiver status error or address bit detected in 9-bit mode\n");
831 dev_dbg(dev, "Serial Port 2: Receiver time out\n");
834 /* dev_dbg(dev, "Serial Port 2: Modem status change\n"); */
840 result = usb_submit_urb(urb, GFP_ATOMIC);
842 dev_err(dev, "%s - Error %d submitting control urb\n", __func__, result);
846 * mos7715_interrupt_callback
847 * this is the 7715's callback function for when we have received data on
848 * the interrupt endpoint.
850 static void mos7715_interrupt_callback(struct urb *urb)
854 int status = urb->status;
855 struct device *dev = &urb->dev->dev;
867 /* this urb is terminated, clean up */
868 dev_dbg(dev, "%s - urb shutting down with status: %d\n", __func__, status);
871 dev_dbg(dev, "%s - nonzero urb status received: %d\n", __func__, status);
875 length = urb->actual_length;
876 data = urb->transfer_buffer;
878 /* Structure of data from 7715 device:
879 * Byte 1: IIR serial Port
881 * Byte 2: DSR parallel port
882 * Byte 4: FIFO status for both */
884 if (unlikely(length != 4)) {
885 dev_dbg(dev, "Wrong data !!!\n");
890 if (!(iir & 0x01)) { /* serial port interrupt pending */
891 switch (iir & 0x0f) {
893 dev_dbg(dev, "Serial Port: Receiver status error or address bit detected in 9-bit mode\n");
896 dev_dbg(dev, "Serial Port: Receiver time out\n");
899 /* dev_dbg(dev, "Serial Port: Modem status change\n"); */
904 #ifdef CONFIG_USB_SERIAL_MOS7715_PARPORT
905 { /* update local copy of DSR reg */
906 struct usb_serial_port *port = urb->context;
907 struct mos7715_parport *mos_parport = port->serial->private;
908 if (unlikely(mos_parport == NULL))
910 atomic_set(&mos_parport->shadowDSR, data[2]);
915 result = usb_submit_urb(urb, GFP_ATOMIC);
917 dev_err(dev, "%s - Error %d submitting control urb\n", __func__, result);
921 * mos7720_bulk_in_callback
922 * this is the callback function for when we have received data on the
925 static void mos7720_bulk_in_callback(struct urb *urb)
928 unsigned char *data ;
929 struct usb_serial_port *port;
930 int status = urb->status;
933 dev_dbg(&urb->dev->dev, "nonzero read bulk status received: %d\n", status);
939 dev_dbg(&port->dev, "Entering...%s\n", __func__);
941 data = urb->transfer_buffer;
943 if (urb->actual_length) {
944 tty_insert_flip_string(&port->port, data, urb->actual_length);
945 tty_flip_buffer_push(&port->port);
948 if (port->read_urb->status != -EINPROGRESS) {
949 retval = usb_submit_urb(port->read_urb, GFP_ATOMIC);
951 dev_dbg(&port->dev, "usb_submit_urb(read bulk) failed, retval = %d\n", retval);
956 * mos7720_bulk_out_data_callback
957 * this is the callback function for when we have finished sending serial
958 * data on the bulk out endpoint.
960 static void mos7720_bulk_out_data_callback(struct urb *urb)
962 struct moschip_port *mos7720_port;
963 int status = urb->status;
966 dev_dbg(&urb->dev->dev, "nonzero write bulk status received:%d\n", status);
970 mos7720_port = urb->context;
972 dev_dbg(&urb->dev->dev, "NULL mos7720_port pointer\n");
976 if (mos7720_port->open)
977 tty_port_tty_wakeup(&mos7720_port->port->port);
980 static int mos77xx_calc_num_ports(struct usb_serial *serial,
981 struct usb_serial_endpoints *epds)
983 u16 product = le16_to_cpu(serial->dev->descriptor.idProduct);
985 if (product == MOSCHIP_DEVICE_ID_7715) {
987 * The 7715 uses the first bulk in/out endpoint pair for the
988 * parallel port, and the second for the serial port. We swap
989 * the endpoint descriptors here so that the the first and
990 * only registered port structure uses the serial-port
993 swap(epds->bulk_in[0], epds->bulk_in[1]);
994 swap(epds->bulk_out[0], epds->bulk_out[1]);
1002 static int mos7720_open(struct tty_struct *tty, struct usb_serial_port *port)
1004 struct usb_serial *serial;
1006 struct moschip_port *mos7720_port;
1010 int allocated_urbs = 0;
1013 serial = port->serial;
1015 mos7720_port = usb_get_serial_port_data(port);
1016 if (mos7720_port == NULL)
1019 usb_clear_halt(serial->dev, port->write_urb->pipe);
1020 usb_clear_halt(serial->dev, port->read_urb->pipe);
1022 /* Initialising the write urb pool */
1023 for (j = 0; j < NUM_URBS; ++j) {
1024 urb = usb_alloc_urb(0, GFP_KERNEL);
1025 mos7720_port->write_urb_pool[j] = urb;
1029 urb->transfer_buffer = kmalloc(URB_TRANSFER_BUFFER_SIZE,
1031 if (!urb->transfer_buffer) {
1032 usb_free_urb(mos7720_port->write_urb_pool[j]);
1033 mos7720_port->write_urb_pool[j] = NULL;
1039 if (!allocated_urbs)
1042 /* Initialize MCS7720 -- Write Init values to corresponding Registers
1045 * 0 : MOS7720_THR/MOS7720_RHR
1054 * 0x08 : SP1/2 Control Reg
1056 port_number = port->port_number;
1057 read_mos_reg(serial, port_number, MOS7720_LSR, &data);
1059 dev_dbg(&port->dev, "SS::%p LSR:%x\n", mos7720_port, data);
1061 write_mos_reg(serial, dummy, MOS7720_SP1_REG, 0x02);
1062 write_mos_reg(serial, dummy, MOS7720_SP2_REG, 0x02);
1064 write_mos_reg(serial, port_number, MOS7720_IER, 0x00);
1065 write_mos_reg(serial, port_number, MOS7720_FCR, 0x00);
1067 write_mos_reg(serial, port_number, MOS7720_FCR, 0xcf);
1068 mos7720_port->shadowLCR = 0x03;
1069 write_mos_reg(serial, port_number, MOS7720_LCR,
1070 mos7720_port->shadowLCR);
1071 mos7720_port->shadowMCR = 0x0b;
1072 write_mos_reg(serial, port_number, MOS7720_MCR,
1073 mos7720_port->shadowMCR);
1075 write_mos_reg(serial, port_number, MOS7720_SP_CONTROL_REG, 0x00);
1076 read_mos_reg(serial, dummy, MOS7720_SP_CONTROL_REG, &data);
1077 data = data | (port->port_number + 1);
1078 write_mos_reg(serial, dummy, MOS7720_SP_CONTROL_REG, data);
1079 mos7720_port->shadowLCR = 0x83;
1080 write_mos_reg(serial, port_number, MOS7720_LCR,
1081 mos7720_port->shadowLCR);
1082 write_mos_reg(serial, port_number, MOS7720_THR, 0x0c);
1083 write_mos_reg(serial, port_number, MOS7720_IER, 0x00);
1084 mos7720_port->shadowLCR = 0x03;
1085 write_mos_reg(serial, port_number, MOS7720_LCR,
1086 mos7720_port->shadowLCR);
1087 write_mos_reg(serial, port_number, MOS7720_IER, 0x0c);
1089 response = usb_submit_urb(port->read_urb, GFP_KERNEL);
1091 dev_err(&port->dev, "%s - Error %d submitting read urb\n",
1092 __func__, response);
1094 /* initialize our port settings */
1095 mos7720_port->shadowMCR = UART_MCR_OUT2; /* Must set to enable ints! */
1097 /* send a open port command */
1098 mos7720_port->open = 1;
1104 * mos7720_chars_in_buffer
1105 * this function is called by the tty driver when it wants to know how many
1106 * bytes of data we currently have outstanding in the port (data that has
1107 * been written, but hasn't made it out the port yet)
1108 * If successful, we return the number of bytes left to be written in the
1110 * Otherwise we return a negative error number.
1112 static int mos7720_chars_in_buffer(struct tty_struct *tty)
1114 struct usb_serial_port *port = tty->driver_data;
1117 struct moschip_port *mos7720_port;
1119 mos7720_port = usb_get_serial_port_data(port);
1120 if (mos7720_port == NULL)
1123 for (i = 0; i < NUM_URBS; ++i) {
1124 if (mos7720_port->write_urb_pool[i] &&
1125 mos7720_port->write_urb_pool[i]->status == -EINPROGRESS)
1126 chars += URB_TRANSFER_BUFFER_SIZE;
1128 dev_dbg(&port->dev, "%s - returns %d\n", __func__, chars);
1132 static void mos7720_close(struct usb_serial_port *port)
1134 struct usb_serial *serial;
1135 struct moschip_port *mos7720_port;
1138 serial = port->serial;
1140 mos7720_port = usb_get_serial_port_data(port);
1141 if (mos7720_port == NULL)
1144 for (j = 0; j < NUM_URBS; ++j)
1145 usb_kill_urb(mos7720_port->write_urb_pool[j]);
1147 /* Freeing Write URBs */
1148 for (j = 0; j < NUM_URBS; ++j) {
1149 if (mos7720_port->write_urb_pool[j]) {
1150 kfree(mos7720_port->write_urb_pool[j]->transfer_buffer);
1151 usb_free_urb(mos7720_port->write_urb_pool[j]);
1155 /* While closing port, shutdown all bulk read, write *
1156 * and interrupt read if they exists, otherwise nop */
1157 usb_kill_urb(port->write_urb);
1158 usb_kill_urb(port->read_urb);
1160 write_mos_reg(serial, port->port_number, MOS7720_MCR, 0x00);
1161 write_mos_reg(serial, port->port_number, MOS7720_IER, 0x00);
1163 mos7720_port->open = 0;
1166 static void mos7720_break(struct tty_struct *tty, int break_state)
1168 struct usb_serial_port *port = tty->driver_data;
1170 struct usb_serial *serial;
1171 struct moschip_port *mos7720_port;
1173 serial = port->serial;
1175 mos7720_port = usb_get_serial_port_data(port);
1176 if (mos7720_port == NULL)
1179 if (break_state == -1)
1180 data = mos7720_port->shadowLCR | UART_LCR_SBC;
1182 data = mos7720_port->shadowLCR & ~UART_LCR_SBC;
1184 mos7720_port->shadowLCR = data;
1185 write_mos_reg(serial, port->port_number, MOS7720_LCR,
1186 mos7720_port->shadowLCR);
1190 * mos7720_write_room
1191 * this function is called by the tty driver when it wants to know how many
1192 * bytes of data we can accept for a specific port.
1193 * If successful, we return the amount of room that we have for this port
1194 * Otherwise we return a negative error number.
1196 static int mos7720_write_room(struct tty_struct *tty)
1198 struct usb_serial_port *port = tty->driver_data;
1199 struct moschip_port *mos7720_port;
1203 mos7720_port = usb_get_serial_port_data(port);
1204 if (mos7720_port == NULL)
1207 /* FIXME: Locking */
1208 for (i = 0; i < NUM_URBS; ++i) {
1209 if (mos7720_port->write_urb_pool[i] &&
1210 mos7720_port->write_urb_pool[i]->status != -EINPROGRESS)
1211 room += URB_TRANSFER_BUFFER_SIZE;
1214 dev_dbg(&port->dev, "%s - returns %d\n", __func__, room);
1218 static int mos7720_write(struct tty_struct *tty, struct usb_serial_port *port,
1219 const unsigned char *data, int count)
1226 struct moschip_port *mos7720_port;
1227 struct usb_serial *serial;
1229 const unsigned char *current_position = data;
1231 serial = port->serial;
1233 mos7720_port = usb_get_serial_port_data(port);
1234 if (mos7720_port == NULL)
1237 /* try to find a free urb in the list */
1240 for (i = 0; i < NUM_URBS; ++i) {
1241 if (mos7720_port->write_urb_pool[i] &&
1242 mos7720_port->write_urb_pool[i]->status != -EINPROGRESS) {
1243 urb = mos7720_port->write_urb_pool[i];
1244 dev_dbg(&port->dev, "URB:%d\n", i);
1250 dev_dbg(&port->dev, "%s - no more free urbs\n", __func__);
1254 if (urb->transfer_buffer == NULL) {
1255 urb->transfer_buffer = kmalloc(URB_TRANSFER_BUFFER_SIZE,
1257 if (!urb->transfer_buffer) {
1258 bytes_sent = -ENOMEM;
1262 transfer_size = min(count, URB_TRANSFER_BUFFER_SIZE);
1264 memcpy(urb->transfer_buffer, current_position, transfer_size);
1265 usb_serial_debug_data(&port->dev, __func__, transfer_size,
1266 urb->transfer_buffer);
1268 /* fill urb with data and submit */
1269 usb_fill_bulk_urb(urb, serial->dev,
1270 usb_sndbulkpipe(serial->dev,
1271 port->bulk_out_endpointAddress),
1272 urb->transfer_buffer, transfer_size,
1273 mos7720_bulk_out_data_callback, mos7720_port);
1275 /* send it down the pipe */
1276 status = usb_submit_urb(urb, GFP_ATOMIC);
1278 dev_err_console(port, "%s - usb_submit_urb(write bulk) failed "
1279 "with status = %d\n", __func__, status);
1280 bytes_sent = status;
1283 bytes_sent = transfer_size;
1289 static void mos7720_throttle(struct tty_struct *tty)
1291 struct usb_serial_port *port = tty->driver_data;
1292 struct moschip_port *mos7720_port;
1295 mos7720_port = usb_get_serial_port_data(port);
1297 if (mos7720_port == NULL)
1300 if (!mos7720_port->open) {
1301 dev_dbg(&port->dev, "%s - port not opened\n", __func__);
1305 /* if we are implementing XON/XOFF, send the stop character */
1307 unsigned char stop_char = STOP_CHAR(tty);
1308 status = mos7720_write(tty, port, &stop_char, 1);
1313 /* if we are implementing RTS/CTS, toggle that line */
1314 if (C_CRTSCTS(tty)) {
1315 mos7720_port->shadowMCR &= ~UART_MCR_RTS;
1316 write_mos_reg(port->serial, port->port_number, MOS7720_MCR,
1317 mos7720_port->shadowMCR);
1321 static void mos7720_unthrottle(struct tty_struct *tty)
1323 struct usb_serial_port *port = tty->driver_data;
1324 struct moschip_port *mos7720_port = usb_get_serial_port_data(port);
1327 if (mos7720_port == NULL)
1330 if (!mos7720_port->open) {
1331 dev_dbg(&port->dev, "%s - port not opened\n", __func__);
1335 /* if we are implementing XON/XOFF, send the start character */
1337 unsigned char start_char = START_CHAR(tty);
1338 status = mos7720_write(tty, port, &start_char, 1);
1343 /* if we are implementing RTS/CTS, toggle that line */
1344 if (C_CRTSCTS(tty)) {
1345 mos7720_port->shadowMCR |= UART_MCR_RTS;
1346 write_mos_reg(port->serial, port->port_number, MOS7720_MCR,
1347 mos7720_port->shadowMCR);
1351 /* FIXME: this function does not work */
1352 static int set_higher_rates(struct moschip_port *mos7720_port,
1355 struct usb_serial_port *port;
1356 struct usb_serial *serial;
1358 enum mos_regs sp_reg;
1359 if (mos7720_port == NULL)
1362 port = mos7720_port->port;
1363 serial = port->serial;
1365 /***********************************************
1366 * Init Sequence for higher rates
1367 ***********************************************/
1368 dev_dbg(&port->dev, "Sending Setting Commands ..........\n");
1369 port_number = port->port_number;
1371 write_mos_reg(serial, port_number, MOS7720_IER, 0x00);
1372 write_mos_reg(serial, port_number, MOS7720_FCR, 0x00);
1373 write_mos_reg(serial, port_number, MOS7720_FCR, 0xcf);
1374 mos7720_port->shadowMCR = 0x0b;
1375 write_mos_reg(serial, port_number, MOS7720_MCR,
1376 mos7720_port->shadowMCR);
1377 write_mos_reg(serial, dummy, MOS7720_SP_CONTROL_REG, 0x00);
1379 /***********************************************
1380 * Set for higher rates *
1381 ***********************************************/
1382 /* writing baud rate verbatum into uart clock field clearly not right */
1383 if (port_number == 0)
1384 sp_reg = MOS7720_SP1_REG;
1386 sp_reg = MOS7720_SP2_REG;
1387 write_mos_reg(serial, dummy, sp_reg, baud * 0x10);
1388 write_mos_reg(serial, dummy, MOS7720_SP_CONTROL_REG, 0x03);
1389 mos7720_port->shadowMCR = 0x2b;
1390 write_mos_reg(serial, port_number, MOS7720_MCR,
1391 mos7720_port->shadowMCR);
1393 /***********************************************
1395 ***********************************************/
1396 mos7720_port->shadowLCR = mos7720_port->shadowLCR | UART_LCR_DLAB;
1397 write_mos_reg(serial, port_number, MOS7720_LCR,
1398 mos7720_port->shadowLCR);
1399 write_mos_reg(serial, port_number, MOS7720_DLL, 0x01);
1400 write_mos_reg(serial, port_number, MOS7720_DLM, 0x00);
1401 mos7720_port->shadowLCR = mos7720_port->shadowLCR & ~UART_LCR_DLAB;
1402 write_mos_reg(serial, port_number, MOS7720_LCR,
1403 mos7720_port->shadowLCR);
1408 /* baud rate information */
1409 struct divisor_table_entry {
1414 /* Define table of divisors for moschip 7720 hardware *
1415 * These assume a 3.6864MHz crystal, the standard /16, and *
1417 static const struct divisor_table_entry divisor_table[] = {
1419 { 110, 1047}, /* 2094.545455 => 230450 => .0217 % over */
1420 { 134, 857}, /* 1713.011152 => 230398.5 => .00065% under */
1436 /*****************************************************************************
1437 * calc_baud_rate_divisor
1438 * this function calculates the proper baud rate divisor for the specified
1440 *****************************************************************************/
1441 static int calc_baud_rate_divisor(struct usb_serial_port *port, int baudrate, int *divisor)
1449 dev_dbg(&port->dev, "%s - %d\n", __func__, baudrate);
1451 for (i = 0; i < ARRAY_SIZE(divisor_table); i++) {
1452 if (divisor_table[i].baudrate == baudrate) {
1453 *divisor = divisor_table[i].divisor;
1458 /* After trying for all the standard baud rates *
1459 * Try calculating the divisor for this baud rate */
1460 if (baudrate > 75 && baudrate < 230400) {
1461 /* get the divisor */
1462 custom = (__u16)(230400L / baudrate);
1464 /* Check for round off */
1465 round1 = (__u16)(2304000L / baudrate);
1466 round = (__u16)(round1 - (custom * 10));
1471 dev_dbg(&port->dev, "Baud %d = %d\n", baudrate, custom);
1475 dev_dbg(&port->dev, "Baud calculation Failed...\n");
1480 * send_cmd_write_baud_rate
1481 * this function sends the proper command to change the baud rate of the
1484 static int send_cmd_write_baud_rate(struct moschip_port *mos7720_port,
1487 struct usb_serial_port *port;
1488 struct usb_serial *serial;
1491 unsigned char number;
1493 if (mos7720_port == NULL)
1496 port = mos7720_port->port;
1497 serial = port->serial;
1499 number = port->port_number;
1500 dev_dbg(&port->dev, "%s - baud = %d\n", __func__, baudrate);
1502 /* Calculate the Divisor */
1503 status = calc_baud_rate_divisor(port, baudrate, &divisor);
1505 dev_err(&port->dev, "%s - bad baud rate\n", __func__);
1509 /* Enable access to divisor latch */
1510 mos7720_port->shadowLCR = mos7720_port->shadowLCR | UART_LCR_DLAB;
1511 write_mos_reg(serial, number, MOS7720_LCR, mos7720_port->shadowLCR);
1513 /* Write the divisor */
1514 write_mos_reg(serial, number, MOS7720_DLL, (__u8)(divisor & 0xff));
1515 write_mos_reg(serial, number, MOS7720_DLM,
1516 (__u8)((divisor & 0xff00) >> 8));
1518 /* Disable access to divisor latch */
1519 mos7720_port->shadowLCR = mos7720_port->shadowLCR & ~UART_LCR_DLAB;
1520 write_mos_reg(serial, number, MOS7720_LCR, mos7720_port->shadowLCR);
1526 * change_port_settings
1527 * This routine is called to set the UART on the device to match
1528 * the specified new settings.
1530 static void change_port_settings(struct tty_struct *tty,
1531 struct moschip_port *mos7720_port,
1532 struct ktermios *old_termios)
1534 struct usb_serial_port *port;
1535 struct usb_serial *serial;
1546 if (mos7720_port == NULL)
1549 port = mos7720_port->port;
1550 serial = port->serial;
1551 port_number = port->port_number;
1553 if (!mos7720_port->open) {
1554 dev_dbg(&port->dev, "%s - port not opened\n", __func__);
1558 lData = UART_LCR_WLEN8;
1559 lStop = 0x00; /* 1 stop bit */
1560 lParity = 0x00; /* No parity */
1562 cflag = tty->termios.c_cflag;
1563 iflag = tty->termios.c_iflag;
1565 /* Change the number of bits */
1566 switch (cflag & CSIZE) {
1568 lData = UART_LCR_WLEN5;
1573 lData = UART_LCR_WLEN6;
1578 lData = UART_LCR_WLEN7;
1583 lData = UART_LCR_WLEN8;
1587 /* Change the Parity bit */
1588 if (cflag & PARENB) {
1589 if (cflag & PARODD) {
1590 lParity = UART_LCR_PARITY;
1591 dev_dbg(&port->dev, "%s - parity = odd\n", __func__);
1593 lParity = (UART_LCR_EPAR | UART_LCR_PARITY);
1594 dev_dbg(&port->dev, "%s - parity = even\n", __func__);
1598 dev_dbg(&port->dev, "%s - parity = none\n", __func__);
1602 lParity = lParity | 0x20;
1604 /* Change the Stop bit */
1605 if (cflag & CSTOPB) {
1606 lStop = UART_LCR_STOP;
1607 dev_dbg(&port->dev, "%s - stop bits = 2\n", __func__);
1610 dev_dbg(&port->dev, "%s - stop bits = 1\n", __func__);
1613 #define LCR_BITS_MASK 0x03 /* Mask for bits/char field */
1614 #define LCR_STOP_MASK 0x04 /* Mask for stop bits field */
1615 #define LCR_PAR_MASK 0x38 /* Mask for parity field */
1617 /* Update the LCR with the correct value */
1618 mos7720_port->shadowLCR &=
1619 ~(LCR_BITS_MASK | LCR_STOP_MASK | LCR_PAR_MASK);
1620 mos7720_port->shadowLCR |= (lData | lParity | lStop);
1623 /* Disable Interrupts */
1624 write_mos_reg(serial, port_number, MOS7720_IER, 0x00);
1625 write_mos_reg(serial, port_number, MOS7720_FCR, 0x00);
1626 write_mos_reg(serial, port_number, MOS7720_FCR, 0xcf);
1628 /* Send the updated LCR value to the mos7720 */
1629 write_mos_reg(serial, port_number, MOS7720_LCR,
1630 mos7720_port->shadowLCR);
1631 mos7720_port->shadowMCR = 0x0b;
1632 write_mos_reg(serial, port_number, MOS7720_MCR,
1633 mos7720_port->shadowMCR);
1635 /* set up the MCR register and send it to the mos7720 */
1636 mos7720_port->shadowMCR = UART_MCR_OUT2;
1638 mos7720_port->shadowMCR |= (UART_MCR_DTR | UART_MCR_RTS);
1640 if (cflag & CRTSCTS) {
1641 mos7720_port->shadowMCR |= (UART_MCR_XONANY);
1642 /* To set hardware flow control to the specified *
1643 * serial port, in SP1/2_CONTROL_REG */
1645 write_mos_reg(serial, dummy, MOS7720_SP_CONTROL_REG,
1648 write_mos_reg(serial, dummy, MOS7720_SP_CONTROL_REG,
1652 mos7720_port->shadowMCR &= ~(UART_MCR_XONANY);
1654 write_mos_reg(serial, port_number, MOS7720_MCR,
1655 mos7720_port->shadowMCR);
1657 /* Determine divisor based on baud rate */
1658 baud = tty_get_baud_rate(tty);
1660 /* pick a default, any default... */
1661 dev_dbg(&port->dev, "Picked default baud...\n");
1665 if (baud >= 230400) {
1666 set_higher_rates(mos7720_port, baud);
1667 /* Enable Interrupts */
1668 write_mos_reg(serial, port_number, MOS7720_IER, 0x0c);
1672 dev_dbg(&port->dev, "%s - baud rate = %d\n", __func__, baud);
1673 status = send_cmd_write_baud_rate(mos7720_port, baud);
1674 /* FIXME: needs to write actual resulting baud back not just
1677 tty_encode_baud_rate(tty, baud, baud);
1678 /* Enable Interrupts */
1679 write_mos_reg(serial, port_number, MOS7720_IER, 0x0c);
1681 if (port->read_urb->status != -EINPROGRESS) {
1682 status = usb_submit_urb(port->read_urb, GFP_KERNEL);
1684 dev_dbg(&port->dev, "usb_submit_urb(read bulk) failed, status = %d\n", status);
1689 * mos7720_set_termios
1690 * this function is called by the tty driver when it wants to change the
1691 * termios structure.
1693 static void mos7720_set_termios(struct tty_struct *tty,
1694 struct usb_serial_port *port, struct ktermios *old_termios)
1697 struct usb_serial *serial;
1698 struct moschip_port *mos7720_port;
1700 serial = port->serial;
1702 mos7720_port = usb_get_serial_port_data(port);
1704 if (mos7720_port == NULL)
1707 if (!mos7720_port->open) {
1708 dev_dbg(&port->dev, "%s - port not opened\n", __func__);
1712 /* change the port settings to the new ones specified */
1713 change_port_settings(tty, mos7720_port, old_termios);
1715 if (port->read_urb->status != -EINPROGRESS) {
1716 status = usb_submit_urb(port->read_urb, GFP_KERNEL);
1718 dev_dbg(&port->dev, "usb_submit_urb(read bulk) failed, status = %d\n", status);
1723 * get_lsr_info - get line status register info
1725 * Purpose: Let user call ioctl() to get info when the UART physically
1726 * is emptied. On bus types like RS485, the transmitter must
1727 * release the bus after transmitting. This must be done when
1728 * the transmit shift register is empty, not be done when the
1729 * transmit holding register is empty. This functionality
1730 * allows an RS485 driver to be written in user space.
1732 static int get_lsr_info(struct tty_struct *tty,
1733 struct moschip_port *mos7720_port, unsigned int __user *value)
1735 struct usb_serial_port *port = tty->driver_data;
1736 unsigned int result = 0;
1737 unsigned char data = 0;
1738 int port_number = port->port_number;
1741 count = mos7720_chars_in_buffer(tty);
1743 read_mos_reg(port->serial, port_number, MOS7720_LSR, &data);
1744 if ((data & (UART_LSR_TEMT | UART_LSR_THRE))
1745 == (UART_LSR_TEMT | UART_LSR_THRE)) {
1746 dev_dbg(&port->dev, "%s -- Empty\n", __func__);
1747 result = TIOCSER_TEMT;
1750 if (copy_to_user(value, &result, sizeof(int)))
1755 static int mos7720_tiocmget(struct tty_struct *tty)
1757 struct usb_serial_port *port = tty->driver_data;
1758 struct moschip_port *mos7720_port = usb_get_serial_port_data(port);
1759 unsigned int result = 0;
1763 mcr = mos7720_port->shadowMCR;
1764 msr = mos7720_port->shadowMSR;
1766 result = ((mcr & UART_MCR_DTR) ? TIOCM_DTR : 0) /* 0x002 */
1767 | ((mcr & UART_MCR_RTS) ? TIOCM_RTS : 0) /* 0x004 */
1768 | ((msr & UART_MSR_CTS) ? TIOCM_CTS : 0) /* 0x020 */
1769 | ((msr & UART_MSR_DCD) ? TIOCM_CAR : 0) /* 0x040 */
1770 | ((msr & UART_MSR_RI) ? TIOCM_RI : 0) /* 0x080 */
1771 | ((msr & UART_MSR_DSR) ? TIOCM_DSR : 0); /* 0x100 */
1776 static int mos7720_tiocmset(struct tty_struct *tty,
1777 unsigned int set, unsigned int clear)
1779 struct usb_serial_port *port = tty->driver_data;
1780 struct moschip_port *mos7720_port = usb_get_serial_port_data(port);
1783 mcr = mos7720_port->shadowMCR;
1785 if (set & TIOCM_RTS)
1786 mcr |= UART_MCR_RTS;
1787 if (set & TIOCM_DTR)
1788 mcr |= UART_MCR_DTR;
1789 if (set & TIOCM_LOOP)
1790 mcr |= UART_MCR_LOOP;
1792 if (clear & TIOCM_RTS)
1793 mcr &= ~UART_MCR_RTS;
1794 if (clear & TIOCM_DTR)
1795 mcr &= ~UART_MCR_DTR;
1796 if (clear & TIOCM_LOOP)
1797 mcr &= ~UART_MCR_LOOP;
1799 mos7720_port->shadowMCR = mcr;
1800 write_mos_reg(port->serial, port->port_number, MOS7720_MCR,
1801 mos7720_port->shadowMCR);
1806 static int set_modem_info(struct moschip_port *mos7720_port, unsigned int cmd,
1807 unsigned int __user *value)
1812 struct usb_serial_port *port;
1814 if (mos7720_port == NULL)
1817 port = (struct usb_serial_port *)mos7720_port->port;
1818 mcr = mos7720_port->shadowMCR;
1820 if (copy_from_user(&arg, value, sizeof(int)))
1825 if (arg & TIOCM_RTS)
1826 mcr |= UART_MCR_RTS;
1827 if (arg & TIOCM_DTR)
1828 mcr |= UART_MCR_RTS;
1829 if (arg & TIOCM_LOOP)
1830 mcr |= UART_MCR_LOOP;
1834 if (arg & TIOCM_RTS)
1835 mcr &= ~UART_MCR_RTS;
1836 if (arg & TIOCM_DTR)
1837 mcr &= ~UART_MCR_RTS;
1838 if (arg & TIOCM_LOOP)
1839 mcr &= ~UART_MCR_LOOP;
1844 mos7720_port->shadowMCR = mcr;
1845 write_mos_reg(port->serial, port->port_number, MOS7720_MCR,
1846 mos7720_port->shadowMCR);
1851 static int get_serial_info(struct moschip_port *mos7720_port,
1852 struct serial_struct __user *retinfo)
1854 struct serial_struct tmp;
1856 memset(&tmp, 0, sizeof(tmp));
1858 tmp.type = PORT_16550A;
1859 tmp.line = mos7720_port->port->minor;
1860 tmp.port = mos7720_port->port->port_number;
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)
1884 dev_dbg(&port->dev, "%s TIOCSERGETLSR\n", __func__);
1885 return get_lsr_info(tty, mos7720_port,
1886 (unsigned int __user *)arg);
1888 /* FIXME: These should be using the mode methods */
1891 dev_dbg(&port->dev, "%s TIOCMSET/TIOCMBIC/TIOCMSET\n", __func__);
1892 return set_modem_info(mos7720_port, cmd,
1893 (unsigned int __user *)arg);
1896 dev_dbg(&port->dev, "%s TIOCGSERIAL\n", __func__);
1897 return get_serial_info(mos7720_port,
1898 (struct serial_struct __user *)arg);
1901 return -ENOIOCTLCMD;
1904 static int mos7720_startup(struct usb_serial *serial)
1906 struct usb_device *dev;
1911 product = le16_to_cpu(serial->dev->descriptor.idProduct);
1914 if (product == MOSCHIP_DEVICE_ID_7715) {
1915 struct urb *urb = serial->port[0]->interrupt_in_urb;
1917 urb->complete = mos7715_interrupt_callback;
1919 #ifdef CONFIG_USB_SERIAL_MOS7715_PARPORT
1920 ret_val = mos7715_parport_init(serial);
1925 /* start the interrupt urb */
1926 ret_val = usb_submit_urb(serial->port[0]->interrupt_in_urb, GFP_KERNEL);
1928 dev_err(&dev->dev, "failed to submit interrupt urb: %d\n",
1932 /* LSR For Port 1 */
1933 read_mos_reg(serial, 0, MOS7720_LSR, &data);
1934 dev_dbg(&dev->dev, "LSR:%x\n", data);
1939 static void mos7720_release(struct usb_serial *serial)
1941 usb_kill_urb(serial->port[0]->interrupt_in_urb);
1943 #ifdef CONFIG_USB_SERIAL_MOS7715_PARPORT
1944 /* close the parallel port */
1946 if (le16_to_cpu(serial->dev->descriptor.idProduct)
1947 == MOSCHIP_DEVICE_ID_7715) {
1948 struct urbtracker *urbtrack;
1949 unsigned long flags;
1950 struct mos7715_parport *mos_parport =
1951 usb_get_serial_data(serial);
1953 /* prevent NULL ptr dereference in port callbacks */
1954 spin_lock(&release_lock);
1955 mos_parport->pp->private_data = NULL;
1956 spin_unlock(&release_lock);
1958 /* wait for synchronous usb calls to return */
1959 if (mos_parport->msg_pending)
1960 wait_for_completion_timeout(&mos_parport->syncmsg_compl,
1961 msecs_to_jiffies(MOS_WDR_TIMEOUT));
1963 parport_remove_port(mos_parport->pp);
1964 usb_set_serial_data(serial, NULL);
1965 mos_parport->serial = NULL;
1967 /* if tasklet currently scheduled, wait for it to complete */
1968 tasklet_kill(&mos_parport->urb_tasklet);
1970 /* unlink any urbs sent by the tasklet */
1971 spin_lock_irqsave(&mos_parport->listlock, flags);
1972 list_for_each_entry(urbtrack,
1973 &mos_parport->active_urbs,
1975 usb_unlink_urb(urbtrack->urb);
1976 spin_unlock_irqrestore(&mos_parport->listlock, flags);
1977 parport_del_port(mos_parport->pp);
1979 kref_put(&mos_parport->ref_count, destroy_mos_parport);
1984 static int mos7720_port_probe(struct usb_serial_port *port)
1986 struct moschip_port *mos7720_port;
1988 mos7720_port = kzalloc(sizeof(*mos7720_port), GFP_KERNEL);
1992 mos7720_port->port = port;
1994 usb_set_serial_port_data(port, mos7720_port);
1999 static int mos7720_port_remove(struct usb_serial_port *port)
2001 struct moschip_port *mos7720_port;
2003 mos7720_port = usb_get_serial_port_data(port);
2004 kfree(mos7720_port);
2009 static struct usb_serial_driver moschip7720_2port_driver = {
2011 .owner = THIS_MODULE,
2012 .name = "moschip7720",
2014 .description = "Moschip 2 port adapter",
2015 .id_table = id_table,
2018 .num_interrupt_in = 1,
2019 .calc_num_ports = mos77xx_calc_num_ports,
2020 .open = mos7720_open,
2021 .close = mos7720_close,
2022 .throttle = mos7720_throttle,
2023 .unthrottle = mos7720_unthrottle,
2024 .attach = mos7720_startup,
2025 .release = mos7720_release,
2026 .port_probe = mos7720_port_probe,
2027 .port_remove = mos7720_port_remove,
2028 .ioctl = mos7720_ioctl,
2029 .tiocmget = mos7720_tiocmget,
2030 .tiocmset = mos7720_tiocmset,
2031 .set_termios = mos7720_set_termios,
2032 .write = mos7720_write,
2033 .write_room = mos7720_write_room,
2034 .chars_in_buffer = mos7720_chars_in_buffer,
2035 .break_ctl = mos7720_break,
2036 .read_bulk_callback = mos7720_bulk_in_callback,
2037 .read_int_callback = mos7720_interrupt_callback,
2040 static struct usb_serial_driver * const serial_drivers[] = {
2041 &moschip7720_2port_driver, NULL
2044 module_usb_serial_driver(serial_drivers, id_table);
2046 MODULE_AUTHOR(DRIVER_AUTHOR);
2047 MODULE_DESCRIPTION(DRIVER_DESC);
2048 MODULE_LICENSE("GPL");