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 async_icount icount
;
66 struct usb_serial_port
*port
; /* loop back to the owner */
67 struct urb
*write_urb_pool
[NUM_URBS
];
70 static struct usb_serial_driver moschip7720_2port_driver
;
72 #define USB_VENDOR_ID_MOSCHIP 0x9710
73 #define MOSCHIP_DEVICE_ID_7720 0x7720
74 #define MOSCHIP_DEVICE_ID_7715 0x7715
76 static const struct usb_device_id id_table
[] = {
77 { USB_DEVICE(USB_VENDOR_ID_MOSCHIP
, MOSCHIP_DEVICE_ID_7720
) },
78 { USB_DEVICE(USB_VENDOR_ID_MOSCHIP
, MOSCHIP_DEVICE_ID_7715
) },
79 { } /* terminating entry */
81 MODULE_DEVICE_TABLE(usb
, id_table
);
83 #ifdef CONFIG_USB_SERIAL_MOS7715_PARPORT
85 /* initial values for parport regs */
86 #define DCR_INIT_VAL 0x0c /* SLCTIN, nINIT */
87 #define ECR_INIT_VAL 0x00 /* SPP mode */
90 struct mos7715_parport
*mos_parport
;
91 struct list_head urblist_entry
;
92 struct kref ref_count
;
96 enum mos7715_pp_modes
{
98 PS2
= 1<<5, /* moschip calls this 'NIBBLE' mode */
99 PPF
= 2<<5, /* moschip calls this 'CB-FIFO mode */
102 struct mos7715_parport
{
103 struct parport
*pp
; /* back to containing struct */
104 struct kref ref_count
; /* to instance of this struct */
105 struct list_head deferred_urbs
; /* list deferred async urbs */
106 struct list_head active_urbs
; /* list async urbs in flight */
107 spinlock_t listlock
; /* protects list access */
108 bool msg_pending
; /* usb sync call pending */
109 struct completion syncmsg_compl
; /* usb sync call completed */
110 struct tasklet_struct urb_tasklet
; /* for sending deferred urbs */
111 struct usb_serial
*serial
; /* back to containing struct */
112 __u8 shadowECR
; /* parallel port regs... */
114 atomic_t shadowDSR
; /* updated in int-in callback */
117 /* lock guards against dereferencing NULL ptr in parport ops callbacks */
118 static DEFINE_SPINLOCK(release_lock
);
120 #endif /* CONFIG_USB_SERIAL_MOS7715_PARPORT */
122 static const unsigned int dummy
; /* for clarity in register access fns */
125 THR
, /* serial port regs */
137 DPR
, /* parallel port regs */
141 SP1_REG
, /* device control regs */
142 SP2_REG
, /* serial port 2 (7720 only) */
148 * Return the correct value for the Windex field of the setup packet
149 * for a control endpoint message. See the 7715 datasheet.
151 static inline __u16
get_reg_index(enum mos_regs reg
)
153 static const __u16 mos7715_index_lookup_table
[] = {
171 0x02, /* SP2_REG (7720 only) */
172 0x04, /* PP_REG (7715 only) */
173 0x08, /* SP_CONTROL_REG */
175 return mos7715_index_lookup_table
[reg
];
179 * Return the correct value for the upper byte of the Wvalue field of
180 * the setup packet for a control endpoint message.
182 static inline __u16
get_reg_value(enum mos_regs reg
,
183 unsigned int serial_portnum
)
185 if (reg
>= SP1_REG
) /* control reg */
188 else if (reg
>= DPR
) /* parallel port reg (7715 only) */
191 else /* serial port reg */
192 return (serial_portnum
+ 2) << 8;
196 * Write data byte to the specified device register. The data is embedded in
197 * the value field of the setup packet. serial_portnum is ignored for registers
198 * not specific to a particular serial port.
200 static int write_mos_reg(struct usb_serial
*serial
, unsigned int serial_portnum
,
201 enum mos_regs reg
, __u8 data
)
203 struct usb_device
*usbdev
= serial
->dev
;
204 unsigned int pipe
= usb_sndctrlpipe(usbdev
, 0);
205 __u8 request
= (__u8
)0x0e;
206 __u8 requesttype
= (__u8
)0x40;
207 __u16 index
= get_reg_index(reg
);
208 __u16 value
= get_reg_value(reg
, serial_portnum
) + data
;
209 int status
= usb_control_msg(usbdev
, pipe
, request
, requesttype
, value
,
210 index
, NULL
, 0, MOS_WDR_TIMEOUT
);
212 dev_err(&usbdev
->dev
,
213 "mos7720: usb_control_msg() failed: %d", status
);
218 * Read data byte from the specified device register. The data returned by the
219 * device is embedded in the value field of the setup packet. serial_portnum is
220 * ignored for registers that are not specific to a particular serial port.
222 static int read_mos_reg(struct usb_serial
*serial
, unsigned int serial_portnum
,
223 enum mos_regs reg
, __u8
*data
)
225 struct usb_device
*usbdev
= serial
->dev
;
226 unsigned int pipe
= usb_rcvctrlpipe(usbdev
, 0);
227 __u8 request
= (__u8
)0x0d;
228 __u8 requesttype
= (__u8
)0xc0;
229 __u16 index
= get_reg_index(reg
);
230 __u16 value
= get_reg_value(reg
, serial_portnum
);
231 int status
= usb_control_msg(usbdev
, pipe
, request
, requesttype
, value
,
232 index
, data
, 1, MOS_WDR_TIMEOUT
);
234 dev_err(&usbdev
->dev
,
235 "mos7720: usb_control_msg() failed: %d", status
);
239 #ifdef CONFIG_USB_SERIAL_MOS7715_PARPORT
241 static inline int mos7715_change_mode(struct mos7715_parport
*mos_parport
,
242 enum mos7715_pp_modes mode
)
244 mos_parport
->shadowECR
= mode
;
245 write_mos_reg(mos_parport
->serial
, dummy
, ECR
, mos_parport
->shadowECR
);
249 static void destroy_mos_parport(struct kref
*kref
)
251 struct mos7715_parport
*mos_parport
=
252 container_of(kref
, struct mos7715_parport
, ref_count
);
257 static void destroy_urbtracker(struct kref
*kref
)
259 struct urbtracker
*urbtrack
=
260 container_of(kref
, struct urbtracker
, ref_count
);
261 struct mos7715_parport
*mos_parport
= urbtrack
->mos_parport
;
263 usb_free_urb(urbtrack
->urb
);
265 kref_put(&mos_parport
->ref_count
, destroy_mos_parport
);
269 * This runs as a tasklet when sending an urb in a non-blocking parallel
270 * port callback had to be deferred because the disconnect mutex could not be
271 * obtained at the time.
273 static void send_deferred_urbs(unsigned long _mos_parport
)
277 struct mos7715_parport
*mos_parport
= (void *)_mos_parport
;
278 struct urbtracker
*urbtrack
, *tmp
;
279 struct list_head
*cursor
, *next
;
282 /* if release function ran, game over */
283 if (unlikely(mos_parport
->serial
== NULL
))
286 dev
= &mos_parport
->serial
->dev
->dev
;
288 /* try again to get the mutex */
289 if (!mutex_trylock(&mos_parport
->serial
->disc_mutex
)) {
290 dev_dbg(dev
, "%s: rescheduling tasklet\n", __func__
);
291 tasklet_schedule(&mos_parport
->urb_tasklet
);
295 /* if device disconnected, game over */
296 if (unlikely(mos_parport
->serial
->disconnected
)) {
297 mutex_unlock(&mos_parport
->serial
->disc_mutex
);
301 spin_lock_irqsave(&mos_parport
->listlock
, flags
);
302 if (list_empty(&mos_parport
->deferred_urbs
)) {
303 spin_unlock_irqrestore(&mos_parport
->listlock
, flags
);
304 mutex_unlock(&mos_parport
->serial
->disc_mutex
);
305 dev_dbg(dev
, "%s: deferred_urbs list empty\n", __func__
);
309 /* move contents of deferred_urbs list to active_urbs list and submit */
310 list_for_each_safe(cursor
, next
, &mos_parport
->deferred_urbs
)
311 list_move_tail(cursor
, &mos_parport
->active_urbs
);
312 list_for_each_entry_safe(urbtrack
, tmp
, &mos_parport
->active_urbs
,
314 ret_val
= usb_submit_urb(urbtrack
->urb
, GFP_ATOMIC
);
315 dev_dbg(dev
, "%s: urb submitted\n", __func__
);
317 dev_err(dev
, "usb_submit_urb() failed: %d\n", ret_val
);
318 list_del(&urbtrack
->urblist_entry
);
319 kref_put(&urbtrack
->ref_count
, destroy_urbtracker
);
322 spin_unlock_irqrestore(&mos_parport
->listlock
, flags
);
323 mutex_unlock(&mos_parport
->serial
->disc_mutex
);
326 /* callback for parallel port control urbs submitted asynchronously */
327 static void async_complete(struct urb
*urb
)
329 struct urbtracker
*urbtrack
= urb
->context
;
330 int status
= urb
->status
;
332 if (unlikely(status
))
333 dev_dbg(&urb
->dev
->dev
, "%s - nonzero urb status received: %d\n", __func__
, status
);
335 /* remove the urbtracker from the active_urbs list */
336 spin_lock(&urbtrack
->mos_parport
->listlock
);
337 list_del(&urbtrack
->urblist_entry
);
338 spin_unlock(&urbtrack
->mos_parport
->listlock
);
339 kref_put(&urbtrack
->ref_count
, destroy_urbtracker
);
342 static int write_parport_reg_nonblock(struct mos7715_parport
*mos_parport
,
343 enum mos_regs reg
, __u8 data
)
345 struct urbtracker
*urbtrack
;
348 struct usb_ctrlrequest setup
;
349 struct usb_serial
*serial
= mos_parport
->serial
;
350 struct usb_device
*usbdev
= serial
->dev
;
352 /* create and initialize the control urb and containing urbtracker */
353 urbtrack
= kmalloc(sizeof(struct urbtracker
), GFP_ATOMIC
);
354 if (urbtrack
== NULL
) {
355 dev_err(&usbdev
->dev
, "out of memory");
358 kref_get(&mos_parport
->ref_count
);
359 urbtrack
->mos_parport
= mos_parport
;
360 urbtrack
->urb
= usb_alloc_urb(0, GFP_ATOMIC
);
361 if (urbtrack
->urb
== NULL
) {
362 dev_err(&usbdev
->dev
, "out of urbs");
366 setup
.bRequestType
= (__u8
)0x40;
367 setup
.bRequest
= (__u8
)0x0e;
368 setup
.wValue
= get_reg_value(reg
, dummy
);
369 setup
.wIndex
= get_reg_index(reg
);
371 usb_fill_control_urb(urbtrack
->urb
, usbdev
,
372 usb_sndctrlpipe(usbdev
, 0),
373 (unsigned char *)&setup
,
374 NULL
, 0, async_complete
, urbtrack
);
375 kref_init(&urbtrack
->ref_count
);
376 INIT_LIST_HEAD(&urbtrack
->urblist_entry
);
379 * get the disconnect mutex, or add tracker to the deferred_urbs list
380 * and schedule a tasklet to try again later
382 if (!mutex_trylock(&serial
->disc_mutex
)) {
383 spin_lock_irqsave(&mos_parport
->listlock
, flags
);
384 list_add_tail(&urbtrack
->urblist_entry
,
385 &mos_parport
->deferred_urbs
);
386 spin_unlock_irqrestore(&mos_parport
->listlock
, flags
);
387 tasklet_schedule(&mos_parport
->urb_tasklet
);
388 dev_dbg(&usbdev
->dev
, "tasklet scheduled");
392 /* bail if device disconnected */
393 if (serial
->disconnected
) {
394 kref_put(&urbtrack
->ref_count
, destroy_urbtracker
);
395 mutex_unlock(&serial
->disc_mutex
);
399 /* add the tracker to the active_urbs list and submit */
400 spin_lock_irqsave(&mos_parport
->listlock
, flags
);
401 list_add_tail(&urbtrack
->urblist_entry
, &mos_parport
->active_urbs
);
402 spin_unlock_irqrestore(&mos_parport
->listlock
, flags
);
403 ret_val
= usb_submit_urb(urbtrack
->urb
, GFP_ATOMIC
);
404 mutex_unlock(&serial
->disc_mutex
);
406 dev_err(&usbdev
->dev
,
407 "%s: submit_urb() failed: %d", __func__
, ret_val
);
408 spin_lock_irqsave(&mos_parport
->listlock
, flags
);
409 list_del(&urbtrack
->urblist_entry
);
410 spin_unlock_irqrestore(&mos_parport
->listlock
, flags
);
411 kref_put(&urbtrack
->ref_count
, destroy_urbtracker
);
418 * This is the the common top part of all parallel port callback operations that
419 * send synchronous messages to the device. This implements convoluted locking
420 * that avoids two scenarios: (1) a port operation is called after usbserial
421 * has called our release function, at which point struct mos7715_parport has
422 * been destroyed, and (2) the device has been disconnected, but usbserial has
423 * not called the release function yet because someone has a serial port open.
424 * The shared release_lock prevents the first, and the mutex and disconnected
425 * flag maintained by usbserial covers the second. We also use the msg_pending
426 * flag to ensure that all synchronous usb messgage calls have completed before
427 * our release function can return.
429 static int parport_prologue(struct parport
*pp
)
431 struct mos7715_parport
*mos_parport
;
433 spin_lock(&release_lock
);
434 mos_parport
= pp
->private_data
;
435 if (unlikely(mos_parport
== NULL
)) {
436 /* release fn called, port struct destroyed */
437 spin_unlock(&release_lock
);
440 mos_parport
->msg_pending
= true; /* synch usb call pending */
441 INIT_COMPLETION(mos_parport
->syncmsg_compl
);
442 spin_unlock(&release_lock
);
444 mutex_lock(&mos_parport
->serial
->disc_mutex
);
445 if (mos_parport
->serial
->disconnected
) {
446 /* device disconnected */
447 mutex_unlock(&mos_parport
->serial
->disc_mutex
);
448 mos_parport
->msg_pending
= false;
449 complete(&mos_parport
->syncmsg_compl
);
457 * This is the the common bottom part of all parallel port functions that send
458 * synchronous messages to the device.
460 static inline void parport_epilogue(struct parport
*pp
)
462 struct mos7715_parport
*mos_parport
= pp
->private_data
;
463 mutex_unlock(&mos_parport
->serial
->disc_mutex
);
464 mos_parport
->msg_pending
= false;
465 complete(&mos_parport
->syncmsg_compl
);
468 static void parport_mos7715_write_data(struct parport
*pp
, unsigned char d
)
470 struct mos7715_parport
*mos_parport
= pp
->private_data
;
472 if (parport_prologue(pp
) < 0)
474 mos7715_change_mode(mos_parport
, SPP
);
475 write_mos_reg(mos_parport
->serial
, dummy
, DPR
, (__u8
)d
);
476 parport_epilogue(pp
);
479 static unsigned char parport_mos7715_read_data(struct parport
*pp
)
481 struct mos7715_parport
*mos_parport
= pp
->private_data
;
484 if (parport_prologue(pp
) < 0)
486 read_mos_reg(mos_parport
->serial
, dummy
, DPR
, &d
);
487 parport_epilogue(pp
);
491 static void parport_mos7715_write_control(struct parport
*pp
, unsigned char d
)
493 struct mos7715_parport
*mos_parport
= pp
->private_data
;
496 if (parport_prologue(pp
) < 0)
498 data
= ((__u8
)d
& 0x0f) | (mos_parport
->shadowDCR
& 0xf0);
499 write_mos_reg(mos_parport
->serial
, dummy
, DCR
, data
);
500 mos_parport
->shadowDCR
= data
;
501 parport_epilogue(pp
);
504 static unsigned char parport_mos7715_read_control(struct parport
*pp
)
506 struct mos7715_parport
*mos_parport
= pp
->private_data
;
509 spin_lock(&release_lock
);
510 mos_parport
= pp
->private_data
;
511 if (unlikely(mos_parport
== NULL
)) {
512 spin_unlock(&release_lock
);
515 dcr
= mos_parport
->shadowDCR
& 0x0f;
516 spin_unlock(&release_lock
);
520 static unsigned char parport_mos7715_frob_control(struct parport
*pp
,
524 struct mos7715_parport
*mos_parport
= pp
->private_data
;
529 if (parport_prologue(pp
) < 0)
531 mos_parport
->shadowDCR
= (mos_parport
->shadowDCR
& (~mask
)) ^ val
;
532 write_mos_reg(mos_parport
->serial
, dummy
, DCR
, mos_parport
->shadowDCR
);
533 dcr
= mos_parport
->shadowDCR
& 0x0f;
534 parport_epilogue(pp
);
538 static unsigned char parport_mos7715_read_status(struct parport
*pp
)
540 unsigned char status
;
541 struct mos7715_parport
*mos_parport
= pp
->private_data
;
543 spin_lock(&release_lock
);
544 mos_parport
= pp
->private_data
;
545 if (unlikely(mos_parport
== NULL
)) { /* release called */
546 spin_unlock(&release_lock
);
549 status
= atomic_read(&mos_parport
->shadowDSR
) & 0xf8;
550 spin_unlock(&release_lock
);
554 static void parport_mos7715_enable_irq(struct parport
*pp
)
558 static void parport_mos7715_disable_irq(struct parport
*pp
)
562 static void parport_mos7715_data_forward(struct parport
*pp
)
564 struct mos7715_parport
*mos_parport
= pp
->private_data
;
566 if (parport_prologue(pp
) < 0)
568 mos7715_change_mode(mos_parport
, PS2
);
569 mos_parport
->shadowDCR
&= ~0x20;
570 write_mos_reg(mos_parport
->serial
, dummy
, DCR
, mos_parport
->shadowDCR
);
571 parport_epilogue(pp
);
574 static void parport_mos7715_data_reverse(struct parport
*pp
)
576 struct mos7715_parport
*mos_parport
= pp
->private_data
;
578 if (parport_prologue(pp
) < 0)
580 mos7715_change_mode(mos_parport
, PS2
);
581 mos_parport
->shadowDCR
|= 0x20;
582 write_mos_reg(mos_parport
->serial
, dummy
, DCR
, mos_parport
->shadowDCR
);
583 parport_epilogue(pp
);
586 static void parport_mos7715_init_state(struct pardevice
*dev
,
587 struct parport_state
*s
)
589 s
->u
.pc
.ctr
= DCR_INIT_VAL
;
590 s
->u
.pc
.ecr
= ECR_INIT_VAL
;
593 /* N.B. Parport core code requires that this function not block */
594 static void parport_mos7715_save_state(struct parport
*pp
,
595 struct parport_state
*s
)
597 struct mos7715_parport
*mos_parport
;
599 spin_lock(&release_lock
);
600 mos_parport
= pp
->private_data
;
601 if (unlikely(mos_parport
== NULL
)) { /* release called */
602 spin_unlock(&release_lock
);
605 s
->u
.pc
.ctr
= mos_parport
->shadowDCR
;
606 s
->u
.pc
.ecr
= mos_parport
->shadowECR
;
607 spin_unlock(&release_lock
);
610 /* N.B. Parport core code requires that this function not block */
611 static void parport_mos7715_restore_state(struct parport
*pp
,
612 struct parport_state
*s
)
614 struct mos7715_parport
*mos_parport
;
616 spin_lock(&release_lock
);
617 mos_parport
= pp
->private_data
;
618 if (unlikely(mos_parport
== NULL
)) { /* release called */
619 spin_unlock(&release_lock
);
622 write_parport_reg_nonblock(mos_parport
, DCR
, mos_parport
->shadowDCR
);
623 write_parport_reg_nonblock(mos_parport
, ECR
, mos_parport
->shadowECR
);
624 spin_unlock(&release_lock
);
627 static size_t parport_mos7715_write_compat(struct parport
*pp
,
629 size_t len
, int flags
)
632 struct mos7715_parport
*mos_parport
= pp
->private_data
;
635 if (parport_prologue(pp
) < 0)
637 mos7715_change_mode(mos_parport
, PPF
);
638 retval
= usb_bulk_msg(mos_parport
->serial
->dev
,
639 usb_sndbulkpipe(mos_parport
->serial
->dev
, 2),
640 (void *)buffer
, len
, &actual_len
,
642 parport_epilogue(pp
);
644 dev_err(&mos_parport
->serial
->dev
->dev
,
645 "mos7720: usb_bulk_msg() failed: %d", retval
);
651 static struct parport_operations parport_mos7715_ops
= {
652 .owner
= THIS_MODULE
,
653 .write_data
= parport_mos7715_write_data
,
654 .read_data
= parport_mos7715_read_data
,
656 .write_control
= parport_mos7715_write_control
,
657 .read_control
= parport_mos7715_read_control
,
658 .frob_control
= parport_mos7715_frob_control
,
660 .read_status
= parport_mos7715_read_status
,
662 .enable_irq
= parport_mos7715_enable_irq
,
663 .disable_irq
= parport_mos7715_disable_irq
,
665 .data_forward
= parport_mos7715_data_forward
,
666 .data_reverse
= parport_mos7715_data_reverse
,
668 .init_state
= parport_mos7715_init_state
,
669 .save_state
= parport_mos7715_save_state
,
670 .restore_state
= parport_mos7715_restore_state
,
672 .compat_write_data
= parport_mos7715_write_compat
,
674 .nibble_read_data
= parport_ieee1284_read_nibble
,
675 .byte_read_data
= parport_ieee1284_read_byte
,
679 * Allocate and initialize parallel port control struct, initialize
680 * the parallel port hardware device, and register with the parport subsystem.
682 static int mos7715_parport_init(struct usb_serial
*serial
)
684 struct mos7715_parport
*mos_parport
;
686 /* allocate and initialize parallel port control struct */
687 mos_parport
= kzalloc(sizeof(struct mos7715_parport
), GFP_KERNEL
);
688 if (mos_parport
== NULL
) {
689 dev_dbg(&serial
->dev
->dev
, "%s: kzalloc failed\n", __func__
);
692 mos_parport
->msg_pending
= false;
693 kref_init(&mos_parport
->ref_count
);
694 spin_lock_init(&mos_parport
->listlock
);
695 INIT_LIST_HEAD(&mos_parport
->active_urbs
);
696 INIT_LIST_HEAD(&mos_parport
->deferred_urbs
);
697 usb_set_serial_data(serial
, mos_parport
); /* hijack private pointer */
698 mos_parport
->serial
= serial
;
699 tasklet_init(&mos_parport
->urb_tasklet
, send_deferred_urbs
,
700 (unsigned long) mos_parport
);
701 init_completion(&mos_parport
->syncmsg_compl
);
703 /* cycle parallel port reset bit */
704 write_mos_reg(mos_parport
->serial
, dummy
, PP_REG
, (__u8
)0x80);
705 write_mos_reg(mos_parport
->serial
, dummy
, PP_REG
, (__u8
)0x00);
707 /* initialize device registers */
708 mos_parport
->shadowDCR
= DCR_INIT_VAL
;
709 write_mos_reg(mos_parport
->serial
, dummy
, DCR
, mos_parport
->shadowDCR
);
710 mos_parport
->shadowECR
= ECR_INIT_VAL
;
711 write_mos_reg(mos_parport
->serial
, dummy
, ECR
, mos_parport
->shadowECR
);
713 /* register with parport core */
714 mos_parport
->pp
= parport_register_port(0, PARPORT_IRQ_NONE
,
716 &parport_mos7715_ops
);
717 if (mos_parport
->pp
== NULL
) {
718 dev_err(&serial
->interface
->dev
,
719 "Could not register parport\n");
720 kref_put(&mos_parport
->ref_count
, destroy_mos_parport
);
723 mos_parport
->pp
->private_data
= mos_parport
;
724 mos_parport
->pp
->modes
= PARPORT_MODE_COMPAT
| PARPORT_MODE_PCSPP
;
725 mos_parport
->pp
->dev
= &serial
->interface
->dev
;
726 parport_announce_port(mos_parport
->pp
);
730 #endif /* CONFIG_USB_SERIAL_MOS7715_PARPORT */
733 * mos7720_interrupt_callback
734 * this is the callback function for when we have received data on the
735 * interrupt endpoint.
737 static void mos7720_interrupt_callback(struct urb
*urb
)
741 int status
= urb
->status
;
742 struct device
*dev
= &urb
->dev
->dev
;
754 /* this urb is terminated, clean up */
755 dev_dbg(dev
, "%s - urb shutting down with status: %d\n", __func__
, status
);
758 dev_dbg(dev
, "%s - nonzero urb status received: %d\n", __func__
, status
);
762 length
= urb
->actual_length
;
763 data
= urb
->transfer_buffer
;
765 /* Moschip get 4 bytes
766 * Byte 1 IIR Port 1 (port.number is 0)
767 * Byte 2 IIR Port 2 (port.number is 1)
768 * Byte 3 --------------
769 * Byte 4 FIFO status for both */
771 /* the above description is inverted
772 * oneukum 2007-03-14 */
774 if (unlikely(length
!= 4)) {
775 dev_dbg(dev
, "Wrong data !!!\n");
782 if ((sp1
| sp2
) & 0x01) {
783 /* No Interrupt Pending in both the ports */
784 dev_dbg(dev
, "No Interrupt !!!\n");
786 switch (sp1
& 0x0f) {
788 dev_dbg(dev
, "Serial Port 1: Receiver status error or address bit detected in 9-bit mode\n");
791 dev_dbg(dev
, "Serial Port 1: Receiver time out\n");
794 /* dev_dbg(dev, "Serial Port 1: Modem status change\n"); */
798 switch (sp2
& 0x0f) {
800 dev_dbg(dev
, "Serial Port 2: Receiver status error or address bit detected in 9-bit mode\n");
803 dev_dbg(dev
, "Serial Port 2: Receiver time out\n");
806 /* dev_dbg(dev, "Serial Port 2: Modem status change\n"); */
812 result
= usb_submit_urb(urb
, GFP_ATOMIC
);
814 dev_err(dev
, "%s - Error %d submitting control urb\n", __func__
, result
);
818 * mos7715_interrupt_callback
819 * this is the 7715's callback function for when we have received data on
820 * the interrupt endpoint.
822 static void mos7715_interrupt_callback(struct urb
*urb
)
826 int status
= urb
->status
;
827 struct device
*dev
= &urb
->dev
->dev
;
839 /* this urb is terminated, clean up */
840 dev_dbg(dev
, "%s - urb shutting down with status: %d\n", __func__
, status
);
843 dev_dbg(dev
, "%s - nonzero urb status received: %d\n", __func__
, status
);
847 length
= urb
->actual_length
;
848 data
= urb
->transfer_buffer
;
850 /* Structure of data from 7715 device:
851 * Byte 1: IIR serial Port
853 * Byte 2: DSR parallel port
854 * Byte 4: FIFO status for both */
856 if (unlikely(length
!= 4)) {
857 dev_dbg(dev
, "Wrong data !!!\n");
862 if (!(iir
& 0x01)) { /* serial port interrupt pending */
863 switch (iir
& 0x0f) {
865 dev_dbg(dev
, "Serial Port: Receiver status error or address bit detected in 9-bit mode\n\n");
868 dev_dbg(dev
, "Serial Port: Receiver time out\n");
871 /* dev_dbg(dev, "Serial Port: Modem status change\n"); */
876 #ifdef CONFIG_USB_SERIAL_MOS7715_PARPORT
877 { /* update local copy of DSR reg */
878 struct usb_serial_port
*port
= urb
->context
;
879 struct mos7715_parport
*mos_parport
= port
->serial
->private;
880 if (unlikely(mos_parport
== NULL
))
882 atomic_set(&mos_parport
->shadowDSR
, data
[2]);
887 result
= usb_submit_urb(urb
, GFP_ATOMIC
);
889 dev_err(dev
, "%s - Error %d submitting control urb\n", __func__
, result
);
893 * mos7720_bulk_in_callback
894 * this is the callback function for when we have received data on the
897 static void mos7720_bulk_in_callback(struct urb
*urb
)
900 unsigned char *data
;
901 struct usb_serial_port
*port
;
902 int status
= urb
->status
;
905 dev_dbg(&urb
->dev
->dev
, "nonzero read bulk status received: %d\n", status
);
911 dev_dbg(&port
->dev
, "Entering...%s\n", __func__
);
913 data
= urb
->transfer_buffer
;
915 if (urb
->actual_length
) {
916 tty_insert_flip_string(&port
->port
, data
, urb
->actual_length
);
917 tty_flip_buffer_push(&port
->port
);
920 if (port
->read_urb
->status
!= -EINPROGRESS
) {
921 retval
= usb_submit_urb(port
->read_urb
, GFP_ATOMIC
);
923 dev_dbg(&port
->dev
, "usb_submit_urb(read bulk) failed, retval = %d\n", retval
);
928 * mos7720_bulk_out_data_callback
929 * this is the callback function for when we have finished sending serial
930 * data on the bulk out endpoint.
932 static void mos7720_bulk_out_data_callback(struct urb
*urb
)
934 struct moschip_port
*mos7720_port
;
935 struct tty_struct
*tty
;
936 int status
= urb
->status
;
939 dev_dbg(&urb
->dev
->dev
, "nonzero write bulk status received:%d\n", status
);
943 mos7720_port
= urb
->context
;
945 dev_dbg(&urb
->dev
->dev
, "NULL mos7720_port pointer\n");
949 tty
= tty_port_tty_get(&mos7720_port
->port
->port
);
951 if (tty
&& mos7720_port
->open
)
958 * this function installs the appropriate read interrupt endpoint callback
959 * depending on whether the device is a 7720 or 7715, thus avoiding costly
960 * run-time checks in the high-frequency callback routine itself.
962 static int mos77xx_probe(struct usb_serial
*serial
,
963 const struct usb_device_id
*id
)
965 if (id
->idProduct
== MOSCHIP_DEVICE_ID_7715
)
966 moschip7720_2port_driver
.read_int_callback
=
967 mos7715_interrupt_callback
;
969 moschip7720_2port_driver
.read_int_callback
=
970 mos7720_interrupt_callback
;
975 static int mos77xx_calc_num_ports(struct usb_serial
*serial
)
977 u16 product
= le16_to_cpu(serial
->dev
->descriptor
.idProduct
);
978 if (product
== MOSCHIP_DEVICE_ID_7715
)
984 static int mos7720_open(struct tty_struct
*tty
, struct usb_serial_port
*port
)
986 struct usb_serial
*serial
;
988 struct moschip_port
*mos7720_port
;
992 int allocated_urbs
= 0;
995 serial
= port
->serial
;
997 mos7720_port
= usb_get_serial_port_data(port
);
998 if (mos7720_port
== NULL
)
1001 usb_clear_halt(serial
->dev
, port
->write_urb
->pipe
);
1002 usb_clear_halt(serial
->dev
, port
->read_urb
->pipe
);
1004 /* Initialising the write urb pool */
1005 for (j
= 0; j
< NUM_URBS
; ++j
) {
1006 urb
= usb_alloc_urb(0, GFP_KERNEL
);
1007 mos7720_port
->write_urb_pool
[j
] = urb
;
1010 dev_err(&port
->dev
, "No more urbs???\n");
1014 urb
->transfer_buffer
= kmalloc(URB_TRANSFER_BUFFER_SIZE
,
1016 if (!urb
->transfer_buffer
) {
1018 "%s-out of memory for urb buffers.\n",
1020 usb_free_urb(mos7720_port
->write_urb_pool
[j
]);
1021 mos7720_port
->write_urb_pool
[j
] = NULL
;
1027 if (!allocated_urbs
)
1030 /* Initialize MCS7720 -- Write Init values to corresponding Registers
1042 * 0x08 : SP1/2 Control Reg
1044 port_number
= port
->number
- port
->serial
->minor
;
1045 read_mos_reg(serial
, port_number
, LSR
, &data
);
1047 dev_dbg(&port
->dev
, "SS::%p LSR:%x\n", mos7720_port
, data
);
1049 write_mos_reg(serial
, dummy
, SP1_REG
, 0x02);
1050 write_mos_reg(serial
, dummy
, SP2_REG
, 0x02);
1052 write_mos_reg(serial
, port_number
, IER
, 0x00);
1053 write_mos_reg(serial
, port_number
, FCR
, 0x00);
1055 write_mos_reg(serial
, port_number
, FCR
, 0xcf);
1056 mos7720_port
->shadowLCR
= 0x03;
1057 write_mos_reg(serial
, port_number
, LCR
, mos7720_port
->shadowLCR
);
1058 mos7720_port
->shadowMCR
= 0x0b;
1059 write_mos_reg(serial
, port_number
, MCR
, mos7720_port
->shadowMCR
);
1061 write_mos_reg(serial
, port_number
, SP_CONTROL_REG
, 0x00);
1062 read_mos_reg(serial
, dummy
, SP_CONTROL_REG
, &data
);
1063 data
= data
| (port
->number
- port
->serial
->minor
+ 1);
1064 write_mos_reg(serial
, dummy
, SP_CONTROL_REG
, data
);
1065 mos7720_port
->shadowLCR
= 0x83;
1066 write_mos_reg(serial
, port_number
, LCR
, mos7720_port
->shadowLCR
);
1067 write_mos_reg(serial
, port_number
, THR
, 0x0c);
1068 write_mos_reg(serial
, port_number
, IER
, 0x00);
1069 mos7720_port
->shadowLCR
= 0x03;
1070 write_mos_reg(serial
, port_number
, LCR
, mos7720_port
->shadowLCR
);
1071 write_mos_reg(serial
, port_number
, IER
, 0x0c);
1073 response
= usb_submit_urb(port
->read_urb
, GFP_KERNEL
);
1075 dev_err(&port
->dev
, "%s - Error %d submitting read urb\n",
1076 __func__
, response
);
1078 /* initialize our icount structure */
1079 memset(&(mos7720_port
->icount
), 0x00, sizeof(mos7720_port
->icount
));
1081 /* initialize our port settings */
1082 mos7720_port
->shadowMCR
= UART_MCR_OUT2
; /* Must set to enable ints! */
1084 /* send a open port command */
1085 mos7720_port
->open
= 1;
1091 * mos7720_chars_in_buffer
1092 * this function is called by the tty driver when it wants to know how many
1093 * bytes of data we currently have outstanding in the port (data that has
1094 * been written, but hasn't made it out the port yet)
1095 * If successful, we return the number of bytes left to be written in the
1097 * Otherwise we return a negative error number.
1099 static int mos7720_chars_in_buffer(struct tty_struct
*tty
)
1101 struct usb_serial_port
*port
= tty
->driver_data
;
1104 struct moschip_port
*mos7720_port
;
1106 mos7720_port
= usb_get_serial_port_data(port
);
1107 if (mos7720_port
== NULL
)
1110 for (i
= 0; i
< NUM_URBS
; ++i
) {
1111 if (mos7720_port
->write_urb_pool
[i
] &&
1112 mos7720_port
->write_urb_pool
[i
]->status
== -EINPROGRESS
)
1113 chars
+= URB_TRANSFER_BUFFER_SIZE
;
1115 dev_dbg(&port
->dev
, "%s - returns %d\n", __func__
, chars
);
1119 static void mos7720_close(struct usb_serial_port
*port
)
1121 struct usb_serial
*serial
;
1122 struct moschip_port
*mos7720_port
;
1125 serial
= port
->serial
;
1127 mos7720_port
= usb_get_serial_port_data(port
);
1128 if (mos7720_port
== NULL
)
1131 for (j
= 0; j
< NUM_URBS
; ++j
)
1132 usb_kill_urb(mos7720_port
->write_urb_pool
[j
]);
1134 /* Freeing Write URBs */
1135 for (j
= 0; j
< NUM_URBS
; ++j
) {
1136 if (mos7720_port
->write_urb_pool
[j
]) {
1137 kfree(mos7720_port
->write_urb_pool
[j
]->transfer_buffer
);
1138 usb_free_urb(mos7720_port
->write_urb_pool
[j
]);
1142 /* While closing port, shutdown all bulk read, write *
1143 * and interrupt read if they exists, otherwise nop */
1144 usb_kill_urb(port
->write_urb
);
1145 usb_kill_urb(port
->read_urb
);
1147 mutex_lock(&serial
->disc_mutex
);
1148 /* these commands must not be issued if the device has
1149 * been disconnected */
1150 if (!serial
->disconnected
) {
1151 write_mos_reg(serial
, port
->number
- port
->serial
->minor
,
1153 write_mos_reg(serial
, port
->number
- port
->serial
->minor
,
1156 mutex_unlock(&serial
->disc_mutex
);
1157 mos7720_port
->open
= 0;
1160 static void mos7720_break(struct tty_struct
*tty
, int break_state
)
1162 struct usb_serial_port
*port
= tty
->driver_data
;
1164 struct usb_serial
*serial
;
1165 struct moschip_port
*mos7720_port
;
1167 serial
= port
->serial
;
1169 mos7720_port
= usb_get_serial_port_data(port
);
1170 if (mos7720_port
== NULL
)
1173 if (break_state
== -1)
1174 data
= mos7720_port
->shadowLCR
| UART_LCR_SBC
;
1176 data
= mos7720_port
->shadowLCR
& ~UART_LCR_SBC
;
1178 mos7720_port
->shadowLCR
= data
;
1179 write_mos_reg(serial
, port
->number
- port
->serial
->minor
,
1180 LCR
, mos7720_port
->shadowLCR
);
1184 * mos7720_write_room
1185 * this function is called by the tty driver when it wants to know how many
1186 * bytes of data we can accept for a specific port.
1187 * If successful, we return the amount of room that we have for this port
1188 * Otherwise we return a negative error number.
1190 static int mos7720_write_room(struct tty_struct
*tty
)
1192 struct usb_serial_port
*port
= tty
->driver_data
;
1193 struct moschip_port
*mos7720_port
;
1197 mos7720_port
= usb_get_serial_port_data(port
);
1198 if (mos7720_port
== NULL
)
1201 /* FIXME: Locking */
1202 for (i
= 0; i
< NUM_URBS
; ++i
) {
1203 if (mos7720_port
->write_urb_pool
[i
] &&
1204 mos7720_port
->write_urb_pool
[i
]->status
!= -EINPROGRESS
)
1205 room
+= URB_TRANSFER_BUFFER_SIZE
;
1208 dev_dbg(&port
->dev
, "%s - returns %d\n", __func__
, room
);
1212 static int mos7720_write(struct tty_struct
*tty
, struct usb_serial_port
*port
,
1213 const unsigned char *data
, int count
)
1220 struct moschip_port
*mos7720_port
;
1221 struct usb_serial
*serial
;
1223 const unsigned char *current_position
= data
;
1225 serial
= port
->serial
;
1227 mos7720_port
= usb_get_serial_port_data(port
);
1228 if (mos7720_port
== NULL
)
1231 /* try to find a free urb in the list */
1234 for (i
= 0; i
< NUM_URBS
; ++i
) {
1235 if (mos7720_port
->write_urb_pool
[i
] &&
1236 mos7720_port
->write_urb_pool
[i
]->status
!= -EINPROGRESS
) {
1237 urb
= mos7720_port
->write_urb_pool
[i
];
1238 dev_dbg(&port
->dev
, "URB:%d\n", i
);
1244 dev_dbg(&port
->dev
, "%s - no more free urbs\n", __func__
);
1248 if (urb
->transfer_buffer
== NULL
) {
1249 urb
->transfer_buffer
= kmalloc(URB_TRANSFER_BUFFER_SIZE
,
1251 if (urb
->transfer_buffer
== NULL
) {
1252 dev_err_console(port
, "%s no more kernel memory...\n",
1257 transfer_size
= min(count
, URB_TRANSFER_BUFFER_SIZE
);
1259 memcpy(urb
->transfer_buffer
, current_position
, transfer_size
);
1260 usb_serial_debug_data(&port
->dev
, __func__
, transfer_size
,
1261 urb
->transfer_buffer
);
1263 /* fill urb with data and submit */
1264 usb_fill_bulk_urb(urb
, serial
->dev
,
1265 usb_sndbulkpipe(serial
->dev
,
1266 port
->bulk_out_endpointAddress
),
1267 urb
->transfer_buffer
, transfer_size
,
1268 mos7720_bulk_out_data_callback
, mos7720_port
);
1270 /* send it down the pipe */
1271 status
= usb_submit_urb(urb
, GFP_ATOMIC
);
1273 dev_err_console(port
, "%s - usb_submit_urb(write bulk) failed "
1274 "with status = %d\n", __func__
, status
);
1275 bytes_sent
= status
;
1278 bytes_sent
= transfer_size
;
1284 static void mos7720_throttle(struct tty_struct
*tty
)
1286 struct usb_serial_port
*port
= tty
->driver_data
;
1287 struct moschip_port
*mos7720_port
;
1290 mos7720_port
= usb_get_serial_port_data(port
);
1292 if (mos7720_port
== NULL
)
1295 if (!mos7720_port
->open
) {
1296 dev_dbg(&port
->dev
, "%s - port not opened\n", __func__
);
1300 /* if we are implementing XON/XOFF, send the stop character */
1302 unsigned char stop_char
= STOP_CHAR(tty
);
1303 status
= mos7720_write(tty
, port
, &stop_char
, 1);
1308 /* if we are implementing RTS/CTS, toggle that line */
1309 if (tty
->termios
.c_cflag
& CRTSCTS
) {
1310 mos7720_port
->shadowMCR
&= ~UART_MCR_RTS
;
1311 write_mos_reg(port
->serial
, port
->number
- port
->serial
->minor
,
1312 MCR
, mos7720_port
->shadowMCR
);
1318 static void mos7720_unthrottle(struct tty_struct
*tty
)
1320 struct usb_serial_port
*port
= tty
->driver_data
;
1321 struct moschip_port
*mos7720_port
= usb_get_serial_port_data(port
);
1324 if (mos7720_port
== NULL
)
1327 if (!mos7720_port
->open
) {
1328 dev_dbg(&port
->dev
, "%s - port not opened\n", __func__
);
1332 /* if we are implementing XON/XOFF, send the start character */
1334 unsigned char start_char
= START_CHAR(tty
);
1335 status
= mos7720_write(tty
, port
, &start_char
, 1);
1340 /* if we are implementing RTS/CTS, toggle that line */
1341 if (tty
->termios
.c_cflag
& CRTSCTS
) {
1342 mos7720_port
->shadowMCR
|= UART_MCR_RTS
;
1343 write_mos_reg(port
->serial
, port
->number
- port
->serial
->minor
,
1344 MCR
, mos7720_port
->shadowMCR
);
1350 /* FIXME: this function does not work */
1351 static int set_higher_rates(struct moschip_port
*mos7720_port
,
1354 struct usb_serial_port
*port
;
1355 struct usb_serial
*serial
;
1357 enum mos_regs sp_reg
;
1358 if (mos7720_port
== NULL
)
1361 port
= mos7720_port
->port
;
1362 serial
= port
->serial
;
1364 /***********************************************
1365 * Init Sequence for higher rates
1366 ***********************************************/
1367 dev_dbg(&port
->dev
, "Sending Setting Commands ..........\n");
1368 port_number
= port
->number
- port
->serial
->minor
;
1370 write_mos_reg(serial
, port_number
, IER
, 0x00);
1371 write_mos_reg(serial
, port_number
, FCR
, 0x00);
1372 write_mos_reg(serial
, port_number
, FCR
, 0xcf);
1373 mos7720_port
->shadowMCR
= 0x0b;
1374 write_mos_reg(serial
, port_number
, MCR
, mos7720_port
->shadowMCR
);
1375 write_mos_reg(serial
, dummy
, SP_CONTROL_REG
, 0x00);
1377 /***********************************************
1378 * Set for higher rates *
1379 ***********************************************/
1380 /* writing baud rate verbatum into uart clock field clearly not right */
1381 if (port_number
== 0)
1385 write_mos_reg(serial
, dummy
, sp_reg
, baud
* 0x10);
1386 write_mos_reg(serial
, dummy
, SP_CONTROL_REG
, 0x03);
1387 mos7720_port
->shadowMCR
= 0x2b;
1388 write_mos_reg(serial
, port_number
, MCR
, mos7720_port
->shadowMCR
);
1390 /***********************************************
1392 ***********************************************/
1393 mos7720_port
->shadowLCR
= mos7720_port
->shadowLCR
| UART_LCR_DLAB
;
1394 write_mos_reg(serial
, port_number
, LCR
, mos7720_port
->shadowLCR
);
1395 write_mos_reg(serial
, port_number
, DLL
, 0x01);
1396 write_mos_reg(serial
, port_number
, DLM
, 0x00);
1397 mos7720_port
->shadowLCR
= mos7720_port
->shadowLCR
& ~UART_LCR_DLAB
;
1398 write_mos_reg(serial
, port_number
, LCR
, mos7720_port
->shadowLCR
);
1403 /* baud rate information */
1404 struct divisor_table_entry
{
1409 /* Define table of divisors for moschip 7720 hardware *
1410 * These assume a 3.6864MHz crystal, the standard /16, and *
1412 static struct divisor_table_entry divisor_table
[] = {
1414 { 110, 1047}, /* 2094.545455 => 230450 => .0217 % over */
1415 { 134, 857}, /* 1713.011152 => 230398.5 => .00065% under */
1431 /*****************************************************************************
1432 * calc_baud_rate_divisor
1433 * this function calculates the proper baud rate divisor for the specified
1435 *****************************************************************************/
1436 static int calc_baud_rate_divisor(struct usb_serial_port
*port
, int baudrate
, int *divisor
)
1444 dev_dbg(&port
->dev
, "%s - %d\n", __func__
, baudrate
);
1446 for (i
= 0; i
< ARRAY_SIZE(divisor_table
); i
++) {
1447 if (divisor_table
[i
].baudrate
== baudrate
) {
1448 *divisor
= divisor_table
[i
].divisor
;
1453 /* After trying for all the standard baud rates *
1454 * Try calculating the divisor for this baud rate */
1455 if (baudrate
> 75 && baudrate
< 230400) {
1456 /* get the divisor */
1457 custom
= (__u16
)(230400L / baudrate
);
1459 /* Check for round off */
1460 round1
= (__u16
)(2304000L / baudrate
);
1461 round
= (__u16
)(round1
- (custom
* 10));
1466 dev_dbg(&port
->dev
, "Baud %d = %d\n", baudrate
, custom
);
1470 dev_dbg(&port
->dev
, "Baud calculation Failed...\n");
1475 * send_cmd_write_baud_rate
1476 * this function sends the proper command to change the baud rate of the
1479 static int send_cmd_write_baud_rate(struct moschip_port
*mos7720_port
,
1482 struct usb_serial_port
*port
;
1483 struct usb_serial
*serial
;
1486 unsigned char number
;
1488 if (mos7720_port
== NULL
)
1491 port
= mos7720_port
->port
;
1492 serial
= port
->serial
;
1494 number
= port
->number
- port
->serial
->minor
;
1495 dev_dbg(&port
->dev
, "%s - baud = %d\n", __func__
, baudrate
);
1497 /* Calculate the Divisor */
1498 status
= calc_baud_rate_divisor(port
, baudrate
, &divisor
);
1500 dev_err(&port
->dev
, "%s - bad baud rate\n", __func__
);
1504 /* Enable access to divisor latch */
1505 mos7720_port
->shadowLCR
= mos7720_port
->shadowLCR
| UART_LCR_DLAB
;
1506 write_mos_reg(serial
, number
, LCR
, mos7720_port
->shadowLCR
);
1508 /* Write the divisor */
1509 write_mos_reg(serial
, number
, DLL
, (__u8
)(divisor
& 0xff));
1510 write_mos_reg(serial
, number
, DLM
, (__u8
)((divisor
& 0xff00) >> 8));
1512 /* Disable access to divisor latch */
1513 mos7720_port
->shadowLCR
= mos7720_port
->shadowLCR
& ~UART_LCR_DLAB
;
1514 write_mos_reg(serial
, number
, LCR
, mos7720_port
->shadowLCR
);
1520 * change_port_settings
1521 * This routine is called to set the UART on the device to match
1522 * the specified new settings.
1524 static void change_port_settings(struct tty_struct
*tty
,
1525 struct moschip_port
*mos7720_port
,
1526 struct ktermios
*old_termios
)
1528 struct usb_serial_port
*port
;
1529 struct usb_serial
*serial
;
1540 if (mos7720_port
== NULL
)
1543 port
= mos7720_port
->port
;
1544 serial
= port
->serial
;
1545 port_number
= port
->number
- port
->serial
->minor
;
1547 if (!mos7720_port
->open
) {
1548 dev_dbg(&port
->dev
, "%s - port not opened\n", __func__
);
1552 lData
= UART_LCR_WLEN8
;
1553 lStop
= 0x00; /* 1 stop bit */
1554 lParity
= 0x00; /* No parity */
1556 cflag
= tty
->termios
.c_cflag
;
1557 iflag
= tty
->termios
.c_iflag
;
1559 /* Change the number of bits */
1560 switch (cflag
& CSIZE
) {
1562 lData
= UART_LCR_WLEN5
;
1567 lData
= UART_LCR_WLEN6
;
1572 lData
= UART_LCR_WLEN7
;
1577 lData
= UART_LCR_WLEN8
;
1581 /* Change the Parity bit */
1582 if (cflag
& PARENB
) {
1583 if (cflag
& PARODD
) {
1584 lParity
= UART_LCR_PARITY
;
1585 dev_dbg(&port
->dev
, "%s - parity = odd\n", __func__
);
1587 lParity
= (UART_LCR_EPAR
| UART_LCR_PARITY
);
1588 dev_dbg(&port
->dev
, "%s - parity = even\n", __func__
);
1592 dev_dbg(&port
->dev
, "%s - parity = none\n", __func__
);
1596 lParity
= lParity
| 0x20;
1598 /* Change the Stop bit */
1599 if (cflag
& CSTOPB
) {
1600 lStop
= UART_LCR_STOP
;
1601 dev_dbg(&port
->dev
, "%s - stop bits = 2\n", __func__
);
1604 dev_dbg(&port
->dev
, "%s - stop bits = 1\n", __func__
);
1607 #define LCR_BITS_MASK 0x03 /* Mask for bits/char field */
1608 #define LCR_STOP_MASK 0x04 /* Mask for stop bits field */
1609 #define LCR_PAR_MASK 0x38 /* Mask for parity field */
1611 /* Update the LCR with the correct value */
1612 mos7720_port
->shadowLCR
&=
1613 ~(LCR_BITS_MASK
| LCR_STOP_MASK
| LCR_PAR_MASK
);
1614 mos7720_port
->shadowLCR
|= (lData
| lParity
| lStop
);
1617 /* Disable Interrupts */
1618 write_mos_reg(serial
, port_number
, IER
, 0x00);
1619 write_mos_reg(serial
, port_number
, FCR
, 0x00);
1620 write_mos_reg(serial
, port_number
, FCR
, 0xcf);
1622 /* Send the updated LCR value to the mos7720 */
1623 write_mos_reg(serial
, port_number
, LCR
, mos7720_port
->shadowLCR
);
1624 mos7720_port
->shadowMCR
= 0x0b;
1625 write_mos_reg(serial
, port_number
, MCR
, mos7720_port
->shadowMCR
);
1627 /* set up the MCR register and send it to the mos7720 */
1628 mos7720_port
->shadowMCR
= UART_MCR_OUT2
;
1630 mos7720_port
->shadowMCR
|= (UART_MCR_DTR
| UART_MCR_RTS
);
1632 if (cflag
& CRTSCTS
) {
1633 mos7720_port
->shadowMCR
|= (UART_MCR_XONANY
);
1634 /* To set hardware flow control to the specified *
1635 * serial port, in SP1/2_CONTROL_REG */
1637 write_mos_reg(serial
, dummy
, SP_CONTROL_REG
, 0x01);
1639 write_mos_reg(serial
, dummy
, SP_CONTROL_REG
, 0x02);
1642 mos7720_port
->shadowMCR
&= ~(UART_MCR_XONANY
);
1644 write_mos_reg(serial
, port_number
, MCR
, mos7720_port
->shadowMCR
);
1646 /* Determine divisor based on baud rate */
1647 baud
= tty_get_baud_rate(tty
);
1649 /* pick a default, any default... */
1650 dev_dbg(&port
->dev
, "Picked default baud...\n");
1654 if (baud
>= 230400) {
1655 set_higher_rates(mos7720_port
, baud
);
1656 /* Enable Interrupts */
1657 write_mos_reg(serial
, port_number
, IER
, 0x0c);
1661 dev_dbg(&port
->dev
, "%s - baud rate = %d\n", __func__
, baud
);
1662 status
= send_cmd_write_baud_rate(mos7720_port
, baud
);
1663 /* FIXME: needs to write actual resulting baud back not just
1666 tty_encode_baud_rate(tty
, baud
, baud
);
1667 /* Enable Interrupts */
1668 write_mos_reg(serial
, port_number
, IER
, 0x0c);
1670 if (port
->read_urb
->status
!= -EINPROGRESS
) {
1671 status
= usb_submit_urb(port
->read_urb
, GFP_ATOMIC
);
1673 dev_dbg(&port
->dev
, "usb_submit_urb(read bulk) failed, status = %d\n", status
);
1678 * mos7720_set_termios
1679 * this function is called by the tty driver when it wants to change the
1680 * termios structure.
1682 static void mos7720_set_termios(struct tty_struct
*tty
,
1683 struct usb_serial_port
*port
, struct ktermios
*old_termios
)
1687 struct usb_serial
*serial
;
1688 struct moschip_port
*mos7720_port
;
1690 serial
= port
->serial
;
1692 mos7720_port
= usb_get_serial_port_data(port
);
1694 if (mos7720_port
== NULL
)
1697 if (!mos7720_port
->open
) {
1698 dev_dbg(&port
->dev
, "%s - port not opened\n", __func__
);
1702 dev_dbg(&port
->dev
, "setting termios - ASPIRE\n");
1704 cflag
= tty
->termios
.c_cflag
;
1706 dev_dbg(&port
->dev
, "%s - cflag %08x iflag %08x\n", __func__
,
1707 tty
->termios
.c_cflag
, RELEVANT_IFLAG(tty
->termios
.c_iflag
));
1709 dev_dbg(&port
->dev
, "%s - old cflag %08x old iflag %08x\n", __func__
,
1710 old_termios
->c_cflag
, RELEVANT_IFLAG(old_termios
->c_iflag
));
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_ATOMIC
);
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
->number
- port
->serial
->minor
;
1741 count
= mos7720_chars_in_buffer(tty
);
1743 read_mos_reg(port
->serial
, port_number
, 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
->number
- port
->serial
->minor
,
1801 MCR
, mos7720_port
->shadowMCR
);
1806 static int mos7720_get_icount(struct tty_struct
*tty
,
1807 struct serial_icounter_struct
*icount
)
1809 struct usb_serial_port
*port
= tty
->driver_data
;
1810 struct moschip_port
*mos7720_port
;
1811 struct async_icount cnow
;
1813 mos7720_port
= usb_get_serial_port_data(port
);
1814 cnow
= mos7720_port
->icount
;
1816 icount
->cts
= cnow
.cts
;
1817 icount
->dsr
= cnow
.dsr
;
1818 icount
->rng
= cnow
.rng
;
1819 icount
->dcd
= cnow
.dcd
;
1820 icount
->rx
= cnow
.rx
;
1821 icount
->tx
= cnow
.tx
;
1822 icount
->frame
= cnow
.frame
;
1823 icount
->overrun
= cnow
.overrun
;
1824 icount
->parity
= cnow
.parity
;
1825 icount
->brk
= cnow
.brk
;
1826 icount
->buf_overrun
= cnow
.buf_overrun
;
1828 dev_dbg(&port
->dev
, "%s TIOCGICOUNT RX=%d, TX=%d\n", __func__
,
1829 icount
->rx
, icount
->tx
);
1833 static int set_modem_info(struct moschip_port
*mos7720_port
, unsigned int cmd
,
1834 unsigned int __user
*value
)
1839 struct usb_serial_port
*port
;
1841 if (mos7720_port
== NULL
)
1844 port
= (struct usb_serial_port
*)mos7720_port
->port
;
1845 mcr
= mos7720_port
->shadowMCR
;
1847 if (copy_from_user(&arg
, value
, sizeof(int)))
1852 if (arg
& TIOCM_RTS
)
1853 mcr
|= UART_MCR_RTS
;
1854 if (arg
& TIOCM_DTR
)
1855 mcr
|= UART_MCR_RTS
;
1856 if (arg
& TIOCM_LOOP
)
1857 mcr
|= UART_MCR_LOOP
;
1861 if (arg
& TIOCM_RTS
)
1862 mcr
&= ~UART_MCR_RTS
;
1863 if (arg
& TIOCM_DTR
)
1864 mcr
&= ~UART_MCR_RTS
;
1865 if (arg
& TIOCM_LOOP
)
1866 mcr
&= ~UART_MCR_LOOP
;
1871 mos7720_port
->shadowMCR
= mcr
;
1872 write_mos_reg(port
->serial
, port
->number
- port
->serial
->minor
,
1873 MCR
, mos7720_port
->shadowMCR
);
1878 static int get_serial_info(struct moschip_port
*mos7720_port
,
1879 struct serial_struct __user
*retinfo
)
1881 struct serial_struct tmp
;
1886 memset(&tmp
, 0, sizeof(tmp
));
1888 tmp
.type
= PORT_16550A
;
1889 tmp
.line
= mos7720_port
->port
->serial
->minor
;
1890 tmp
.port
= mos7720_port
->port
->number
;
1892 tmp
.flags
= ASYNC_SKIP_TEST
| ASYNC_AUTO_IRQ
;
1893 tmp
.xmit_fifo_size
= NUM_URBS
* URB_TRANSFER_BUFFER_SIZE
;
1894 tmp
.baud_base
= 9600;
1895 tmp
.close_delay
= 5*HZ
;
1896 tmp
.closing_wait
= 30*HZ
;
1898 if (copy_to_user(retinfo
, &tmp
, sizeof(*retinfo
)))
1903 static int mos7720_ioctl(struct tty_struct
*tty
,
1904 unsigned int cmd
, unsigned long arg
)
1906 struct usb_serial_port
*port
= tty
->driver_data
;
1907 struct moschip_port
*mos7720_port
;
1908 struct async_icount cnow
;
1909 struct async_icount cprev
;
1911 mos7720_port
= usb_get_serial_port_data(port
);
1912 if (mos7720_port
== NULL
)
1915 dev_dbg(&port
->dev
, "%s - cmd = 0x%x", __func__
, cmd
);
1919 dev_dbg(&port
->dev
, "%s TIOCSERGETLSR\n", __func__
);
1920 return get_lsr_info(tty
, mos7720_port
,
1921 (unsigned int __user
*)arg
);
1923 /* FIXME: These should be using the mode methods */
1926 dev_dbg(&port
->dev
, "%s TIOCMSET/TIOCMBIC/TIOCMSET\n", __func__
);
1927 return set_modem_info(mos7720_port
, cmd
,
1928 (unsigned int __user
*)arg
);
1931 dev_dbg(&port
->dev
, "%s TIOCGSERIAL\n", __func__
);
1932 return get_serial_info(mos7720_port
,
1933 (struct serial_struct __user
*)arg
);
1936 dev_dbg(&port
->dev
, "%s TIOCMIWAIT\n", __func__
);
1937 cprev
= mos7720_port
->icount
;
1939 if (signal_pending(current
))
1940 return -ERESTARTSYS
;
1941 cnow
= mos7720_port
->icount
;
1942 if (cnow
.rng
== cprev
.rng
&& cnow
.dsr
== cprev
.dsr
&&
1943 cnow
.dcd
== cprev
.dcd
&& cnow
.cts
== cprev
.cts
)
1944 return -EIO
; /* no change => error */
1945 if (((arg
& TIOCM_RNG
) && (cnow
.rng
!= cprev
.rng
)) ||
1946 ((arg
& TIOCM_DSR
) && (cnow
.dsr
!= cprev
.dsr
)) ||
1947 ((arg
& TIOCM_CD
) && (cnow
.dcd
!= cprev
.dcd
)) ||
1948 ((arg
& TIOCM_CTS
) && (cnow
.cts
!= cprev
.cts
))) {
1957 return -ENOIOCTLCMD
;
1960 static int mos7720_startup(struct usb_serial
*serial
)
1962 struct usb_device
*dev
;
1967 product
= le16_to_cpu(serial
->dev
->descriptor
.idProduct
);
1971 * The 7715 uses the first bulk in/out endpoint pair for the parallel
1972 * port, and the second for the serial port. Because the usbserial core
1973 * assumes both pairs are serial ports, we must engage in a bit of
1974 * subterfuge and swap the pointers for ports 0 and 1 in order to make
1975 * port 0 point to the serial port. However, both moschip devices use a
1976 * single interrupt-in endpoint for both ports (as mentioned a little
1977 * further down), and this endpoint was assigned to port 0. So after
1978 * the swap, we must copy the interrupt endpoint elements from port 1
1979 * (as newly assigned) to port 0, and null out port 1 pointers.
1981 if (product
== MOSCHIP_DEVICE_ID_7715
) {
1982 struct usb_serial_port
*tmp
= serial
->port
[0];
1983 serial
->port
[0] = serial
->port
[1];
1984 serial
->port
[1] = tmp
;
1985 serial
->port
[0]->interrupt_in_urb
= tmp
->interrupt_in_urb
;
1986 serial
->port
[0]->interrupt_in_buffer
= tmp
->interrupt_in_buffer
;
1987 serial
->port
[0]->interrupt_in_endpointAddress
=
1988 tmp
->interrupt_in_endpointAddress
;
1989 serial
->port
[1]->interrupt_in_urb
= NULL
;
1990 serial
->port
[1]->interrupt_in_buffer
= NULL
;
1993 /* setting configuration feature to one */
1994 usb_control_msg(serial
->dev
, usb_sndctrlpipe(serial
->dev
, 0),
1995 (__u8
)0x03, 0x00, 0x01, 0x00, NULL
, 0x00, 5*HZ
);
1997 /* start the interrupt urb */
1998 ret_val
= usb_submit_urb(serial
->port
[0]->interrupt_in_urb
, GFP_KERNEL
);
2001 "%s - Error %d submitting control urb\n",
2004 #ifdef CONFIG_USB_SERIAL_MOS7715_PARPORT
2005 if (product
== MOSCHIP_DEVICE_ID_7715
) {
2006 ret_val
= mos7715_parport_init(serial
);
2011 /* LSR For Port 1 */
2012 read_mos_reg(serial
, 0, LSR
, &data
);
2013 dev_dbg(&dev
->dev
, "LSR:%x\n", data
);
2018 static void mos7720_release(struct usb_serial
*serial
)
2020 #ifdef CONFIG_USB_SERIAL_MOS7715_PARPORT
2021 /* close the parallel port */
2023 if (le16_to_cpu(serial
->dev
->descriptor
.idProduct
)
2024 == MOSCHIP_DEVICE_ID_7715
) {
2025 struct urbtracker
*urbtrack
;
2026 unsigned long flags
;
2027 struct mos7715_parport
*mos_parport
=
2028 usb_get_serial_data(serial
);
2030 /* prevent NULL ptr dereference in port callbacks */
2031 spin_lock(&release_lock
);
2032 mos_parport
->pp
->private_data
= NULL
;
2033 spin_unlock(&release_lock
);
2035 /* wait for synchronous usb calls to return */
2036 if (mos_parport
->msg_pending
)
2037 wait_for_completion_timeout(&mos_parport
->syncmsg_compl
,
2040 parport_remove_port(mos_parport
->pp
);
2041 usb_set_serial_data(serial
, NULL
);
2042 mos_parport
->serial
= NULL
;
2044 /* if tasklet currently scheduled, wait for it to complete */
2045 tasklet_kill(&mos_parport
->urb_tasklet
);
2047 /* unlink any urbs sent by the tasklet */
2048 spin_lock_irqsave(&mos_parport
->listlock
, flags
);
2049 list_for_each_entry(urbtrack
,
2050 &mos_parport
->active_urbs
,
2052 usb_unlink_urb(urbtrack
->urb
);
2053 spin_unlock_irqrestore(&mos_parport
->listlock
, flags
);
2055 kref_put(&mos_parport
->ref_count
, destroy_mos_parport
);
2060 static int mos7720_port_probe(struct usb_serial_port
*port
)
2062 struct moschip_port
*mos7720_port
;
2064 mos7720_port
= kzalloc(sizeof(*mos7720_port
), GFP_KERNEL
);
2068 /* Initialize all port interrupt end point to port 0 int endpoint.
2069 * Our device has only one interrupt endpoint common to all ports.
2071 port
->interrupt_in_endpointAddress
=
2072 port
->serial
->port
[0]->interrupt_in_endpointAddress
;
2073 mos7720_port
->port
= port
;
2075 usb_set_serial_port_data(port
, mos7720_port
);
2080 static int mos7720_port_remove(struct usb_serial_port
*port
)
2082 struct moschip_port
*mos7720_port
;
2084 mos7720_port
= usb_get_serial_port_data(port
);
2085 kfree(mos7720_port
);
2090 static struct usb_serial_driver moschip7720_2port_driver
= {
2092 .owner
= THIS_MODULE
,
2093 .name
= "moschip7720",
2095 .description
= "Moschip 2 port adapter",
2096 .id_table
= id_table
,
2097 .calc_num_ports
= mos77xx_calc_num_ports
,
2098 .open
= mos7720_open
,
2099 .close
= mos7720_close
,
2100 .throttle
= mos7720_throttle
,
2101 .unthrottle
= mos7720_unthrottle
,
2102 .probe
= mos77xx_probe
,
2103 .attach
= mos7720_startup
,
2104 .release
= mos7720_release
,
2105 .port_probe
= mos7720_port_probe
,
2106 .port_remove
= mos7720_port_remove
,
2107 .ioctl
= mos7720_ioctl
,
2108 .tiocmget
= mos7720_tiocmget
,
2109 .tiocmset
= mos7720_tiocmset
,
2110 .get_icount
= mos7720_get_icount
,
2111 .set_termios
= mos7720_set_termios
,
2112 .write
= mos7720_write
,
2113 .write_room
= mos7720_write_room
,
2114 .chars_in_buffer
= mos7720_chars_in_buffer
,
2115 .break_ctl
= mos7720_break
,
2116 .read_bulk_callback
= mos7720_bulk_in_callback
,
2117 .read_int_callback
= NULL
/* dynamically assigned in probe() */
2120 static struct usb_serial_driver
* const serial_drivers
[] = {
2121 &moschip7720_2port_driver
, NULL
2124 module_usb_serial_driver(serial_drivers
, id_table
);
2126 MODULE_AUTHOR(DRIVER_AUTHOR
);
2127 MODULE_DESCRIPTION(DRIVER_DESC
);
2128 MODULE_LICENSE("GPL");