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IRQ: Maintain regs pointer globally rather than passing to IRQ handlers
[mirror_ubuntu-artful-kernel.git] / drivers / usb / serial / mos7840.c
1 /*
2 * This program is free software; you can redistribute it and/or modify
3 * it under the terms of the GNU General Public License as published by
4 * the Free Software Foundation; either version 2 of the License, or
5 * (at your option) any later version.
6 *
7 * This program is distributed in the hope that it will be useful,
8 * but WITHOUT ANY WARRANTY; without even the implied warranty of
9 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
10 * GNU General Public License for more details.
11 *
12 * You should have received a copy of the GNU General Public License
13 * along with this program; if not, write to the Free Software
14 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
15 *
16 * Clean ups from Moschip version and a few ioctl implementations by:
17 * Paul B Schroeder <pschroeder "at" uplogix "dot" com>
18 *
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>
22 *
23 */
24
25 #include <linux/kernel.h>
26 #include <linux/errno.h>
27 #include <linux/init.h>
28 #include <linux/slab.h>
29 #include <linux/tty.h>
30 #include <linux/tty_driver.h>
31 #include <linux/tty_flip.h>
32 #include <linux/module.h>
33 #include <linux/serial.h>
34 #include <linux/usb.h>
35 #include <linux/usb/serial.h>
36 #include <asm/uaccess.h>
37
38 /*
39 * Version Information
40 */
41 #define DRIVER_VERSION "1.3.1"
42 #define DRIVER_DESC "Moschip 7840/7820 USB Serial Driver"
43
44 /*
45 * 16C50 UART register defines
46 */
47
48 #define LCR_BITS_5 0x00 /* 5 bits/char */
49 #define LCR_BITS_6 0x01 /* 6 bits/char */
50 #define LCR_BITS_7 0x02 /* 7 bits/char */
51 #define LCR_BITS_8 0x03 /* 8 bits/char */
52 #define LCR_BITS_MASK 0x03 /* Mask for bits/char field */
53
54 #define LCR_STOP_1 0x00 /* 1 stop bit */
55 #define LCR_STOP_1_5 0x04 /* 1.5 stop bits (if 5 bits/char) */
56 #define LCR_STOP_2 0x04 /* 2 stop bits (if 6-8 bits/char) */
57 #define LCR_STOP_MASK 0x04 /* Mask for stop bits field */
58
59 #define LCR_PAR_NONE 0x00 /* No parity */
60 #define LCR_PAR_ODD 0x08 /* Odd parity */
61 #define LCR_PAR_EVEN 0x18 /* Even parity */
62 #define LCR_PAR_MARK 0x28 /* Force parity bit to 1 */
63 #define LCR_PAR_SPACE 0x38 /* Force parity bit to 0 */
64 #define LCR_PAR_MASK 0x38 /* Mask for parity field */
65
66 #define LCR_SET_BREAK 0x40 /* Set Break condition */
67 #define LCR_DL_ENABLE 0x80 /* Enable access to divisor latch */
68
69 #define MCR_DTR 0x01 /* Assert DTR */
70 #define MCR_RTS 0x02 /* Assert RTS */
71 #define MCR_OUT1 0x04 /* Loopback only: Sets state of RI */
72 #define MCR_MASTER_IE 0x08 /* Enable interrupt outputs */
73 #define MCR_LOOPBACK 0x10 /* Set internal (digital) loopback mode */
74 #define MCR_XON_ANY 0x20 /* Enable any char to exit XOFF mode */
75
76 #define MOS7840_MSR_CTS 0x10 /* Current state of CTS */
77 #define MOS7840_MSR_DSR 0x20 /* Current state of DSR */
78 #define MOS7840_MSR_RI 0x40 /* Current state of RI */
79 #define MOS7840_MSR_CD 0x80 /* Current state of CD */
80
81 /*
82 * Defines used for sending commands to port
83 */
84
85 #define WAIT_FOR_EVER (HZ * 0 ) /* timeout urb is wait for ever */
86 #define MOS_WDR_TIMEOUT (HZ * 5 ) /* default urb timeout */
87
88 #define MOS_PORT1 0x0200
89 #define MOS_PORT2 0x0300
90 #define MOS_VENREG 0x0000
91 #define MOS_MAX_PORT 0x02
92 #define MOS_WRITE 0x0E
93 #define MOS_READ 0x0D
94
95 /* Requests */
96 #define MCS_RD_RTYPE 0xC0
97 #define MCS_WR_RTYPE 0x40
98 #define MCS_RDREQ 0x0D
99 #define MCS_WRREQ 0x0E
100 #define MCS_CTRL_TIMEOUT 500
101 #define VENDOR_READ_LENGTH (0x01)
102
103 #define MAX_NAME_LEN 64
104
105 #define ZLP_REG1 0x3A //Zero_Flag_Reg1 58
106 #define ZLP_REG5 0x3E //Zero_Flag_Reg5 62
107
108 /* For higher baud Rates use TIOCEXBAUD */
109 #define TIOCEXBAUD 0x5462
110
111 /* vendor id and device id defines */
112
113 #define USB_VENDOR_ID_MOSCHIP 0x9710
114 #define MOSCHIP_DEVICE_ID_7840 0x7840
115 #define MOSCHIP_DEVICE_ID_7820 0x7820
116
117 /* Interrupt Rotinue Defines */
118
119 #define SERIAL_IIR_RLS 0x06
120 #define SERIAL_IIR_MS 0x00
121
122 /*
123 * Emulation of the bit mask on the LINE STATUS REGISTER.
124 */
125 #define SERIAL_LSR_DR 0x0001
126 #define SERIAL_LSR_OE 0x0002
127 #define SERIAL_LSR_PE 0x0004
128 #define SERIAL_LSR_FE 0x0008
129 #define SERIAL_LSR_BI 0x0010
130
131 #define MOS_MSR_DELTA_CTS 0x10
132 #define MOS_MSR_DELTA_DSR 0x20
133 #define MOS_MSR_DELTA_RI 0x40
134 #define MOS_MSR_DELTA_CD 0x80
135
136 // Serial Port register Address
137 #define INTERRUPT_ENABLE_REGISTER ((__u16)(0x01))
138 #define FIFO_CONTROL_REGISTER ((__u16)(0x02))
139 #define LINE_CONTROL_REGISTER ((__u16)(0x03))
140 #define MODEM_CONTROL_REGISTER ((__u16)(0x04))
141 #define LINE_STATUS_REGISTER ((__u16)(0x05))
142 #define MODEM_STATUS_REGISTER ((__u16)(0x06))
143 #define SCRATCH_PAD_REGISTER ((__u16)(0x07))
144 #define DIVISOR_LATCH_LSB ((__u16)(0x00))
145 #define DIVISOR_LATCH_MSB ((__u16)(0x01))
146
147 #define CLK_MULTI_REGISTER ((__u16)(0x02))
148 #define CLK_START_VALUE_REGISTER ((__u16)(0x03))
149
150 #define SERIAL_LCR_DLAB ((__u16)(0x0080))
151
152 /*
153 * URB POOL related defines
154 */
155 #define NUM_URBS 16 /* URB Count */
156 #define URB_TRANSFER_BUFFER_SIZE 32 /* URB Size */
157
158
159 static struct usb_device_id moschip_port_id_table[] = {
160 {USB_DEVICE(USB_VENDOR_ID_MOSCHIP, MOSCHIP_DEVICE_ID_7840)},
161 {USB_DEVICE(USB_VENDOR_ID_MOSCHIP, MOSCHIP_DEVICE_ID_7820)},
162 {} /* terminating entry */
163 };
164
165 static __devinitdata struct usb_device_id moschip_id_table_combined[] = {
166 {USB_DEVICE(USB_VENDOR_ID_MOSCHIP, MOSCHIP_DEVICE_ID_7840)},
167 {USB_DEVICE(USB_VENDOR_ID_MOSCHIP, MOSCHIP_DEVICE_ID_7820)},
168 {} /* terminating entry */
169 };
170
171 MODULE_DEVICE_TABLE(usb, moschip_id_table_combined);
172
173 /* This structure holds all of the local port information */
174
175 struct moschip_port {
176 int port_num; /*Actual port number in the device(1,2,etc) */
177 struct urb *write_urb; /* write URB for this port */
178 struct urb *read_urb; /* read URB for this port */
179 __u8 shadowLCR; /* last LCR value received */
180 __u8 shadowMCR; /* last MCR value received */
181 char open;
182 wait_queue_head_t wait_chase; /* for handling sleeping while waiting for chase to finish */
183 wait_queue_head_t delta_msr_wait; /* for handling sleeping while waiting for msr change to happen */
184 int delta_msr_cond;
185 struct async_icount icount;
186 struct usb_serial_port *port; /* loop back to the owner of this object */
187
188 /*Offsets */
189 __u8 SpRegOffset;
190 __u8 ControlRegOffset;
191 __u8 DcrRegOffset;
192 //for processing control URBS in interrupt context
193 struct urb *control_urb;
194 char *ctrl_buf;
195 int MsrLsr;
196
197 struct urb *write_urb_pool[NUM_URBS];
198 };
199
200
201 static int debug;
202 static int mos7840_num_ports; //this says the number of ports in the device
203 static int mos7840_num_open_ports;
204
205
206 /*
207 * mos7840_set_reg_sync
208 * To set the Control register by calling usb_fill_control_urb function
209 * by passing usb_sndctrlpipe function as parameter.
210 */
211
212 static int mos7840_set_reg_sync(struct usb_serial_port *port, __u16 reg,
213 __u16 val)
214 {
215 struct usb_device *dev = port->serial->dev;
216 val = val & 0x00ff;
217 dbg("mos7840_set_reg_sync offset is %x, value %x\n", reg, val);
218
219 return usb_control_msg(dev, usb_sndctrlpipe(dev, 0), MCS_WRREQ,
220 MCS_WR_RTYPE, val, reg, NULL, 0,
221 MOS_WDR_TIMEOUT);
222 }
223
224 /*
225 * mos7840_get_reg_sync
226 * To set the Uart register by calling usb_fill_control_urb function by
227 * passing usb_rcvctrlpipe function as parameter.
228 */
229
230 static int mos7840_get_reg_sync(struct usb_serial_port *port, __u16 reg,
231 __u16 * val)
232 {
233 struct usb_device *dev = port->serial->dev;
234 int ret = 0;
235
236 ret = usb_control_msg(dev, usb_rcvctrlpipe(dev, 0), MCS_RDREQ,
237 MCS_RD_RTYPE, 0, reg, val, VENDOR_READ_LENGTH,
238 MOS_WDR_TIMEOUT);
239 dbg("mos7840_get_reg_sync offset is %x, return val %x\n", reg, *val);
240 *val = (*val) & 0x00ff;
241 return ret;
242 }
243
244 /*
245 * mos7840_set_uart_reg
246 * To set the Uart register by calling usb_fill_control_urb function by
247 * passing usb_sndctrlpipe function as parameter.
248 */
249
250 static int mos7840_set_uart_reg(struct usb_serial_port *port, __u16 reg,
251 __u16 val)
252 {
253
254 struct usb_device *dev = port->serial->dev;
255 val = val & 0x00ff;
256 // For the UART control registers, the application number need to be Or'ed
257 if (mos7840_num_ports == 4) {
258 val |=
259 (((__u16) port->number - (__u16) (port->serial->minor)) +
260 1) << 8;
261 dbg("mos7840_set_uart_reg application number is %x\n", val);
262 } else {
263 if (((__u16) port->number - (__u16) (port->serial->minor)) == 0) {
264 val |=
265 (((__u16) port->number -
266 (__u16) (port->serial->minor)) + 1) << 8;
267 dbg("mos7840_set_uart_reg application number is %x\n",
268 val);
269 } else {
270 val |=
271 (((__u16) port->number -
272 (__u16) (port->serial->minor)) + 2) << 8;
273 dbg("mos7840_set_uart_reg application number is %x\n",
274 val);
275 }
276 }
277 return usb_control_msg(dev, usb_sndctrlpipe(dev, 0), MCS_WRREQ,
278 MCS_WR_RTYPE, val, reg, NULL, 0,
279 MOS_WDR_TIMEOUT);
280
281 }
282
283 /*
284 * mos7840_get_uart_reg
285 * To set the Control register by calling usb_fill_control_urb function
286 * by passing usb_rcvctrlpipe function as parameter.
287 */
288 static int mos7840_get_uart_reg(struct usb_serial_port *port, __u16 reg,
289 __u16 * val)
290 {
291 struct usb_device *dev = port->serial->dev;
292 int ret = 0;
293 __u16 Wval;
294
295 //dbg("application number is %4x \n",(((__u16)port->number - (__u16)(port->serial->minor))+1)<<8);
296 /*Wval is same as application number */
297 if (mos7840_num_ports == 4) {
298 Wval =
299 (((__u16) port->number - (__u16) (port->serial->minor)) +
300 1) << 8;
301 dbg("mos7840_get_uart_reg application number is %x\n", Wval);
302 } else {
303 if (((__u16) port->number - (__u16) (port->serial->minor)) == 0) {
304 Wval =
305 (((__u16) port->number -
306 (__u16) (port->serial->minor)) + 1) << 8;
307 dbg("mos7840_get_uart_reg application number is %x\n",
308 Wval);
309 } else {
310 Wval =
311 (((__u16) port->number -
312 (__u16) (port->serial->minor)) + 2) << 8;
313 dbg("mos7840_get_uart_reg application number is %x\n",
314 Wval);
315 }
316 }
317 ret = usb_control_msg(dev, usb_rcvctrlpipe(dev, 0), MCS_RDREQ,
318 MCS_RD_RTYPE, Wval, reg, val, VENDOR_READ_LENGTH,
319 MOS_WDR_TIMEOUT);
320 *val = (*val) & 0x00ff;
321 return ret;
322 }
323
324 static void mos7840_dump_serial_port(struct moschip_port *mos7840_port)
325 {
326
327 dbg("***************************************\n");
328 dbg("SpRegOffset is %2x\n", mos7840_port->SpRegOffset);
329 dbg("ControlRegOffset is %2x \n", mos7840_port->ControlRegOffset);
330 dbg("DCRRegOffset is %2x \n", mos7840_port->DcrRegOffset);
331 dbg("***************************************\n");
332
333 }
334
335 /************************************************************************/
336 /************************************************************************/
337 /* I N T E R F A C E F U N C T I O N S */
338 /* I N T E R F A C E F U N C T I O N S */
339 /************************************************************************/
340 /************************************************************************/
341
342 static inline void mos7840_set_port_private(struct usb_serial_port *port,
343 struct moschip_port *data)
344 {
345 usb_set_serial_port_data(port, (void *)data);
346 }
347
348 static inline struct moschip_port *mos7840_get_port_private(struct
349 usb_serial_port
350 *port)
351 {
352 return (struct moschip_port *)usb_get_serial_port_data(port);
353 }
354
355 static int mos7840_handle_new_msr(struct moschip_port *port, __u8 new_msr)
356 {
357 struct moschip_port *mos7840_port;
358 struct async_icount *icount;
359 mos7840_port = port;
360 icount = &mos7840_port->icount;
361 if (new_msr &
362 (MOS_MSR_DELTA_CTS | MOS_MSR_DELTA_DSR | MOS_MSR_DELTA_RI |
363 MOS_MSR_DELTA_CD)) {
364 icount = &mos7840_port->icount;
365
366 /* update input line counters */
367 if (new_msr & MOS_MSR_DELTA_CTS) {
368 icount->cts++;
369 }
370 if (new_msr & MOS_MSR_DELTA_DSR) {
371 icount->dsr++;
372 }
373 if (new_msr & MOS_MSR_DELTA_CD) {
374 icount->dcd++;
375 }
376 if (new_msr & MOS_MSR_DELTA_RI) {
377 icount->rng++;
378 }
379 }
380
381 return 0;
382 }
383
384 static int mos7840_handle_new_lsr(struct moschip_port *port, __u8 new_lsr)
385 {
386 struct async_icount *icount;
387
388 dbg("%s - %02x", __FUNCTION__, new_lsr);
389
390 if (new_lsr & SERIAL_LSR_BI) {
391 //
392 // Parity and Framing errors only count if they
393 // occur exclusive of a break being
394 // received.
395 //
396 new_lsr &= (__u8) (SERIAL_LSR_OE | SERIAL_LSR_BI);
397 }
398
399 /* update input line counters */
400 icount = &port->icount;
401 if (new_lsr & SERIAL_LSR_BI) {
402 icount->brk++;
403 }
404 if (new_lsr & SERIAL_LSR_OE) {
405 icount->overrun++;
406 }
407 if (new_lsr & SERIAL_LSR_PE) {
408 icount->parity++;
409 }
410 if (new_lsr & SERIAL_LSR_FE) {
411 icount->frame++;
412 }
413
414 return 0;
415 }
416
417 /************************************************************************/
418 /************************************************************************/
419 /* U S B C A L L B A C K F U N C T I O N S */
420 /* U S B C A L L B A C K F U N C T I O N S */
421 /************************************************************************/
422 /************************************************************************/
423
424 static void mos7840_control_callback(struct urb *urb)
425 {
426 unsigned char *data;
427 struct moschip_port *mos7840_port;
428 __u8 regval = 0x0;
429
430 if (!urb) {
431 dbg("%s", "Invalid Pointer !!!!:\n");
432 return;
433 }
434
435 switch (urb->status) {
436 case 0:
437 /* success */
438 break;
439 case -ECONNRESET:
440 case -ENOENT:
441 case -ESHUTDOWN:
442 /* this urb is terminated, clean up */
443 dbg("%s - urb shutting down with status: %d", __FUNCTION__,
444 urb->status);
445 return;
446 default:
447 dbg("%s - nonzero urb status received: %d", __FUNCTION__,
448 urb->status);
449 goto exit;
450 }
451
452 mos7840_port = (struct moschip_port *)urb->context;
453
454 dbg("%s urb buffer size is %d\n", __FUNCTION__, urb->actual_length);
455 dbg("%s mos7840_port->MsrLsr is %d port %d\n", __FUNCTION__,
456 mos7840_port->MsrLsr, mos7840_port->port_num);
457 data = urb->transfer_buffer;
458 regval = (__u8) data[0];
459 dbg("%s data is %x\n", __FUNCTION__, regval);
460 if (mos7840_port->MsrLsr == 0)
461 mos7840_handle_new_msr(mos7840_port, regval);
462 else if (mos7840_port->MsrLsr == 1)
463 mos7840_handle_new_lsr(mos7840_port, regval);
464
465 exit:
466 return;
467 }
468
469 static int mos7840_get_reg(struct moschip_port *mcs, __u16 Wval, __u16 reg,
470 __u16 * val)
471 {
472 struct usb_device *dev = mcs->port->serial->dev;
473 struct usb_ctrlrequest *dr = NULL;
474 unsigned char *buffer = NULL;
475 int ret = 0;
476 buffer = (__u8 *) mcs->ctrl_buf;
477
478 // dr=(struct usb_ctrlrequest *)(buffer);
479 dr = (void *)(buffer + 2);
480 dr->bRequestType = MCS_RD_RTYPE;
481 dr->bRequest = MCS_RDREQ;
482 dr->wValue = cpu_to_le16(Wval); //0;
483 dr->wIndex = cpu_to_le16(reg);
484 dr->wLength = cpu_to_le16(2);
485
486 usb_fill_control_urb(mcs->control_urb, dev, usb_rcvctrlpipe(dev, 0),
487 (unsigned char *)dr, buffer, 2,
488 mos7840_control_callback, mcs);
489 mcs->control_urb->transfer_buffer_length = 2;
490 ret = usb_submit_urb(mcs->control_urb, GFP_ATOMIC);
491 return ret;
492 }
493
494 /*****************************************************************************
495 * mos7840_interrupt_callback
496 * this is the callback function for when we have received data on the
497 * interrupt endpoint.
498 *****************************************************************************/
499
500 static void mos7840_interrupt_callback(struct urb *urb)
501 {
502 int result;
503 int length;
504 struct moschip_port *mos7840_port;
505 struct usb_serial *serial;
506 __u16 Data;
507 unsigned char *data;
508 __u8 sp[5], st;
509 int i;
510 __u16 wval;
511
512 dbg("%s", " : Entering\n");
513 if (!urb) {
514 dbg("%s", "Invalid Pointer !!!!:\n");
515 return;
516 }
517
518 switch (urb->status) {
519 case 0:
520 /* success */
521 break;
522 case -ECONNRESET:
523 case -ENOENT:
524 case -ESHUTDOWN:
525 /* this urb is terminated, clean up */
526 dbg("%s - urb shutting down with status: %d", __FUNCTION__,
527 urb->status);
528 return;
529 default:
530 dbg("%s - nonzero urb status received: %d", __FUNCTION__,
531 urb->status);
532 goto exit;
533 }
534
535 length = urb->actual_length;
536 data = urb->transfer_buffer;
537
538 serial = (struct usb_serial *)urb->context;
539
540 /* Moschip get 5 bytes
541 * Byte 1 IIR Port 1 (port.number is 0)
542 * Byte 2 IIR Port 2 (port.number is 1)
543 * Byte 3 IIR Port 3 (port.number is 2)
544 * Byte 4 IIR Port 4 (port.number is 3)
545 * Byte 5 FIFO status for both */
546
547 if (length && length > 5) {
548 dbg("%s \n", "Wrong data !!!");
549 return;
550 }
551
552 sp[0] = (__u8) data[0];
553 sp[1] = (__u8) data[1];
554 sp[2] = (__u8) data[2];
555 sp[3] = (__u8) data[3];
556 st = (__u8) data[4];
557
558 for (i = 0; i < serial->num_ports; i++) {
559 mos7840_port = mos7840_get_port_private(serial->port[i]);
560 wval =
561 (((__u16) serial->port[i]->number -
562 (__u16) (serial->minor)) + 1) << 8;
563 if (mos7840_port->open) {
564 if (sp[i] & 0x01) {
565 dbg("SP%d No Interrupt !!!\n", i);
566 } else {
567 switch (sp[i] & 0x0f) {
568 case SERIAL_IIR_RLS:
569 dbg("Serial Port %d: Receiver status error or ", i);
570 dbg("address bit detected in 9-bit mode\n");
571 mos7840_port->MsrLsr = 1;
572 mos7840_get_reg(mos7840_port, wval,
573 LINE_STATUS_REGISTER,
574 &Data);
575 break;
576 case SERIAL_IIR_MS:
577 dbg("Serial Port %d: Modem status change\n", i);
578 mos7840_port->MsrLsr = 0;
579 mos7840_get_reg(mos7840_port, wval,
580 MODEM_STATUS_REGISTER,
581 &Data);
582 break;
583 }
584 }
585 }
586 }
587 exit:
588 result = usb_submit_urb(urb, GFP_ATOMIC);
589 if (result) {
590 dev_err(&urb->dev->dev,
591 "%s - Error %d submitting interrupt urb\n",
592 __FUNCTION__, result);
593 }
594
595 return;
596
597 }
598
599 static int mos7840_port_paranoia_check(struct usb_serial_port *port,
600 const char *function)
601 {
602 if (!port) {
603 dbg("%s - port == NULL", function);
604 return -1;
605 }
606 if (!port->serial) {
607 dbg("%s - port->serial == NULL", function);
608 return -1;
609 }
610
611 return 0;
612 }
613
614 /* Inline functions to check the sanity of a pointer that is passed to us */
615 static int mos7840_serial_paranoia_check(struct usb_serial *serial,
616 const char *function)
617 {
618 if (!serial) {
619 dbg("%s - serial == NULL", function);
620 return -1;
621 }
622 if (!serial->type) {
623 dbg("%s - serial->type == NULL!", function);
624 return -1;
625 }
626
627 return 0;
628 }
629
630 static struct usb_serial *mos7840_get_usb_serial(struct usb_serial_port *port,
631 const char *function)
632 {
633 /* if no port was specified, or it fails a paranoia check */
634 if (!port ||
635 mos7840_port_paranoia_check(port, function) ||
636 mos7840_serial_paranoia_check(port->serial, function)) {
637 /* then say that we don't have a valid usb_serial thing, which will * end up genrating -ENODEV return values */
638 return NULL;
639 }
640
641 return port->serial;
642 }
643
644 /*****************************************************************************
645 * mos7840_bulk_in_callback
646 * this is the callback function for when we have received data on the
647 * bulk in endpoint.
648 *****************************************************************************/
649
650 static void mos7840_bulk_in_callback(struct urb *urb)
651 {
652 int status;
653 unsigned char *data;
654 struct usb_serial *serial;
655 struct usb_serial_port *port;
656 struct moschip_port *mos7840_port;
657 struct tty_struct *tty;
658
659 if (!urb) {
660 dbg("%s", "Invalid Pointer !!!!:\n");
661 return;
662 }
663
664 if (urb->status) {
665 dbg("nonzero read bulk status received: %d", urb->status);
666 return;
667 }
668
669 mos7840_port = (struct moschip_port *)urb->context;
670 if (!mos7840_port) {
671 dbg("%s", "NULL mos7840_port pointer \n");
672 return;
673 }
674
675 port = (struct usb_serial_port *)mos7840_port->port;
676 if (mos7840_port_paranoia_check(port, __FUNCTION__)) {
677 dbg("%s", "Port Paranoia failed \n");
678 return;
679 }
680
681 serial = mos7840_get_usb_serial(port, __FUNCTION__);
682 if (!serial) {
683 dbg("%s\n", "Bad serial pointer ");
684 return;
685 }
686
687 dbg("%s\n", "Entering... \n");
688
689 data = urb->transfer_buffer;
690
691 dbg("%s", "Entering ........... \n");
692
693 if (urb->actual_length) {
694 tty = mos7840_port->port->tty;
695 if (tty) {
696 tty_buffer_request_room(tty, urb->actual_length);
697 tty_insert_flip_string(tty, data, urb->actual_length);
698 dbg(" %s \n", data);
699 tty_flip_buffer_push(tty);
700 }
701 mos7840_port->icount.rx += urb->actual_length;
702 dbg("mos7840_port->icount.rx is %d:\n",
703 mos7840_port->icount.rx);
704 }
705
706 if (!mos7840_port->read_urb) {
707 dbg("%s", "URB KILLED !!!\n");
708 return;
709 }
710
711 if (mos7840_port->read_urb->status != -EINPROGRESS) {
712 mos7840_port->read_urb->dev = serial->dev;
713
714 status = usb_submit_urb(mos7840_port->read_urb, GFP_ATOMIC);
715
716 if (status) {
717 dbg(" usb_submit_urb(read bulk) failed, status = %d",
718 status);
719 }
720 }
721 }
722
723 /*****************************************************************************
724 * mos7840_bulk_out_data_callback
725 * this is the callback function for when we have finished sending serial data
726 * on the bulk out endpoint.
727 *****************************************************************************/
728
729 static void mos7840_bulk_out_data_callback(struct urb *urb)
730 {
731 struct moschip_port *mos7840_port;
732 struct tty_struct *tty;
733 if (!urb) {
734 dbg("%s", "Invalid Pointer !!!!:\n");
735 return;
736 }
737
738 if (urb->status) {
739 dbg("nonzero write bulk status received:%d\n", urb->status);
740 return;
741 }
742
743 mos7840_port = (struct moschip_port *)urb->context;
744 if (!mos7840_port) {
745 dbg("%s", "NULL mos7840_port pointer \n");
746 return;
747 }
748
749 if (mos7840_port_paranoia_check(mos7840_port->port, __FUNCTION__)) {
750 dbg("%s", "Port Paranoia failed \n");
751 return;
752 }
753
754 dbg("%s \n", "Entering .........");
755
756 tty = mos7840_port->port->tty;
757
758 if (tty && mos7840_port->open) {
759 /* let the tty driver wakeup if it has a special *
760 * write_wakeup function */
761
762 if ((tty->flags & (1 << TTY_DO_WRITE_WAKEUP))
763 && tty->ldisc.write_wakeup) {
764 (tty->ldisc.write_wakeup) (tty);
765 }
766
767 /* tell the tty driver that something has changed */
768 wake_up_interruptible(&tty->write_wait);
769 }
770
771 }
772
773 /************************************************************************/
774 /* D R I V E R T T Y I N T E R F A C E F U N C T I O N S */
775 /************************************************************************/
776 #ifdef MCSSerialProbe
777 static int mos7840_serial_probe(struct usb_serial *serial,
778 const struct usb_device_id *id)
779 {
780
781 /*need to implement the mode_reg reading and updating\
782 structures usb_serial_ device_type\
783 (i.e num_ports, num_bulkin,bulkout etc) */
784 /* Also we can update the changes attach */
785 return 1;
786 }
787 #endif
788
789 /*****************************************************************************
790 * mos7840_open
791 * this function is called by the tty driver when a port is opened
792 * If successful, we return 0
793 * Otherwise we return a negative error number.
794 *****************************************************************************/
795
796 static int mos7840_open(struct usb_serial_port *port, struct file *filp)
797 {
798 int response;
799 int j;
800 struct usb_serial *serial;
801 struct urb *urb;
802 __u16 Data;
803 int status;
804 struct moschip_port *mos7840_port;
805
806 if (mos7840_port_paranoia_check(port, __FUNCTION__)) {
807 dbg("%s", "Port Paranoia failed \n");
808 return -ENODEV;
809 }
810
811 mos7840_num_open_ports++;
812 serial = port->serial;
813
814 if (mos7840_serial_paranoia_check(serial, __FUNCTION__)) {
815 dbg("%s", "Serial Paranoia failed \n");
816 return -ENODEV;
817 }
818
819 mos7840_port = mos7840_get_port_private(port);
820
821 if (mos7840_port == NULL)
822 return -ENODEV;
823
824 usb_clear_halt(serial->dev, port->write_urb->pipe);
825 usb_clear_halt(serial->dev, port->read_urb->pipe);
826
827 /* Initialising the write urb pool */
828 for (j = 0; j < NUM_URBS; ++j) {
829 urb = usb_alloc_urb(0, SLAB_ATOMIC);
830 mos7840_port->write_urb_pool[j] = urb;
831
832 if (urb == NULL) {
833 err("No more urbs???");
834 continue;
835 }
836
837 urb->transfer_buffer = NULL;
838 urb->transfer_buffer =
839 kmalloc(URB_TRANSFER_BUFFER_SIZE, GFP_KERNEL);
840 if (!urb->transfer_buffer) {
841 err("%s-out of memory for urb buffers.", __FUNCTION__);
842 continue;
843 }
844 }
845
846 /*****************************************************************************
847 * Initialize MCS7840 -- Write Init values to corresponding Registers
848 *
849 * Register Index
850 * 1 : IER
851 * 2 : FCR
852 * 3 : LCR
853 * 4 : MCR
854 *
855 * 0x08 : SP1/2 Control Reg
856 *****************************************************************************/
857
858 //NEED to check the following Block
859
860 status = 0;
861 Data = 0x0;
862 status = mos7840_get_reg_sync(port, mos7840_port->SpRegOffset, &Data);
863 if (status < 0) {
864 dbg("Reading Spreg failed\n");
865 return -1;
866 }
867 Data |= 0x80;
868 status = mos7840_set_reg_sync(port, mos7840_port->SpRegOffset, Data);
869 if (status < 0) {
870 dbg("writing Spreg failed\n");
871 return -1;
872 }
873
874 Data &= ~0x80;
875 status = mos7840_set_reg_sync(port, mos7840_port->SpRegOffset, Data);
876 if (status < 0) {
877 dbg("writing Spreg failed\n");
878 return -1;
879 }
880 //End of block to be checked
881
882 status = 0;
883 Data = 0x0;
884 status =
885 mos7840_get_reg_sync(port, mos7840_port->ControlRegOffset, &Data);
886 if (status < 0) {
887 dbg("Reading Controlreg failed\n");
888 return -1;
889 }
890 Data |= 0x08; //Driver done bit
891 Data |= 0x20; //rx_disable
892 status = 0;
893 status =
894 mos7840_set_reg_sync(port, mos7840_port->ControlRegOffset, Data);
895 if (status < 0) {
896 dbg("writing Controlreg failed\n");
897 return -1;
898 }
899 //do register settings here
900 // Set all regs to the device default values.
901 ////////////////////////////////////
902 // First Disable all interrupts.
903 ////////////////////////////////////
904
905 Data = 0x00;
906 status = 0;
907 status = mos7840_set_uart_reg(port, INTERRUPT_ENABLE_REGISTER, Data);
908 if (status < 0) {
909 dbg("disableing interrupts failed\n");
910 return -1;
911 }
912 // Set FIFO_CONTROL_REGISTER to the default value
913 Data = 0x00;
914 status = 0;
915 status = mos7840_set_uart_reg(port, FIFO_CONTROL_REGISTER, Data);
916 if (status < 0) {
917 dbg("Writing FIFO_CONTROL_REGISTER failed\n");
918 return -1;
919 }
920
921 Data = 0xcf;
922 status = 0;
923 status = mos7840_set_uart_reg(port, FIFO_CONTROL_REGISTER, Data);
924 if (status < 0) {
925 dbg("Writing FIFO_CONTROL_REGISTER failed\n");
926 return -1;
927 }
928
929 Data = 0x03;
930 status = 0;
931 status = mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data);
932 mos7840_port->shadowLCR = Data;
933
934 Data = 0x0b;
935 status = 0;
936 status = mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER, Data);
937 mos7840_port->shadowMCR = Data;
938
939 Data = 0x00;
940 status = 0;
941 status = mos7840_get_uart_reg(port, LINE_CONTROL_REGISTER, &Data);
942 mos7840_port->shadowLCR = Data;
943
944 Data |= SERIAL_LCR_DLAB; //data latch enable in LCR 0x80
945 status = 0;
946 status = mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data);
947
948 Data = 0x0c;
949 status = 0;
950 status = mos7840_set_uart_reg(port, DIVISOR_LATCH_LSB, Data);
951
952 Data = 0x0;
953 status = 0;
954 status = mos7840_set_uart_reg(port, DIVISOR_LATCH_MSB, Data);
955
956 Data = 0x00;
957 status = 0;
958 status = mos7840_get_uart_reg(port, LINE_CONTROL_REGISTER, &Data);
959
960 Data = Data & ~SERIAL_LCR_DLAB;
961 status = 0;
962 status = mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data);
963 mos7840_port->shadowLCR = Data;
964
965 //clearing Bulkin and Bulkout Fifo
966 Data = 0x0;
967 status = 0;
968 status = mos7840_get_reg_sync(port, mos7840_port->SpRegOffset, &Data);
969
970 Data = Data | 0x0c;
971 status = 0;
972 status = mos7840_set_reg_sync(port, mos7840_port->SpRegOffset, Data);
973
974 Data = Data & ~0x0c;
975 status = 0;
976 status = mos7840_set_reg_sync(port, mos7840_port->SpRegOffset, Data);
977 //Finally enable all interrupts
978 Data = 0x0;
979 Data = 0x0c;
980 status = 0;
981 status = mos7840_set_uart_reg(port, INTERRUPT_ENABLE_REGISTER, Data);
982
983 //clearing rx_disable
984 Data = 0x0;
985 status = 0;
986 status =
987 mos7840_get_reg_sync(port, mos7840_port->ControlRegOffset, &Data);
988 Data = Data & ~0x20;
989 status = 0;
990 status =
991 mos7840_set_reg_sync(port, mos7840_port->ControlRegOffset, Data);
992
993 // rx_negate
994 Data = 0x0;
995 status = 0;
996 status =
997 mos7840_get_reg_sync(port, mos7840_port->ControlRegOffset, &Data);
998 Data = Data | 0x10;
999 status = 0;
1000 status =
1001 mos7840_set_reg_sync(port, mos7840_port->ControlRegOffset, Data);
1002
1003 /* force low_latency on so that our tty_push actually forces *
1004 * the data through,otherwise it is scheduled, and with *
1005 * high data rates (like with OHCI) data can get lost. */
1006
1007 if (port->tty)
1008 port->tty->low_latency = 1;
1009 /* Check to see if we've set up our endpoint info yet *
1010 * (can't set it up in mos7840_startup as the structures *
1011 * were not set up at that time.) */
1012 if (mos7840_num_open_ports == 1) {
1013 if (serial->port[0]->interrupt_in_buffer == NULL) {
1014
1015 /* set up interrupt urb */
1016
1017 usb_fill_int_urb(serial->port[0]->interrupt_in_urb,
1018 serial->dev,
1019 usb_rcvintpipe(serial->dev,
1020 serial->port[0]->
1021 interrupt_in_endpointAddress),
1022 serial->port[0]->interrupt_in_buffer,
1023 serial->port[0]->interrupt_in_urb->
1024 transfer_buffer_length,
1025 mos7840_interrupt_callback,
1026 serial,
1027 serial->port[0]->interrupt_in_urb->
1028 interval);
1029
1030 /* start interrupt read for mos7840 *
1031 * will continue as long as mos7840 is connected */
1032
1033 response =
1034 usb_submit_urb(serial->port[0]->interrupt_in_urb,
1035 GFP_KERNEL);
1036 if (response) {
1037 err("%s - Error %d submitting interrupt urb",
1038 __FUNCTION__, response);
1039 }
1040
1041 }
1042
1043 }
1044
1045 /* see if we've set up our endpoint info yet *
1046 * (can't set it up in mos7840_startup as the *
1047 * structures were not set up at that time.) */
1048
1049 dbg("port number is %d \n", port->number);
1050 dbg("serial number is %d \n", port->serial->minor);
1051 dbg("Bulkin endpoint is %d \n", port->bulk_in_endpointAddress);
1052 dbg("BulkOut endpoint is %d \n", port->bulk_out_endpointAddress);
1053 dbg("Interrupt endpoint is %d \n", port->interrupt_in_endpointAddress);
1054 dbg("port's number in the device is %d\n", mos7840_port->port_num);
1055 mos7840_port->read_urb = port->read_urb;
1056
1057 /* set up our bulk in urb */
1058
1059 usb_fill_bulk_urb(mos7840_port->read_urb,
1060 serial->dev,
1061 usb_rcvbulkpipe(serial->dev,
1062 port->bulk_in_endpointAddress),
1063 port->bulk_in_buffer,
1064 mos7840_port->read_urb->transfer_buffer_length,
1065 mos7840_bulk_in_callback, mos7840_port);
1066
1067 dbg("mos7840_open: bulkin endpoint is %d\n",
1068 port->bulk_in_endpointAddress);
1069 response = usb_submit_urb(mos7840_port->read_urb, GFP_KERNEL);
1070 if (response) {
1071 err("%s - Error %d submitting control urb", __FUNCTION__,
1072 response);
1073 }
1074
1075 /* initialize our wait queues */
1076 init_waitqueue_head(&mos7840_port->wait_chase);
1077 init_waitqueue_head(&mos7840_port->delta_msr_wait);
1078
1079 /* initialize our icount structure */
1080 memset(&(mos7840_port->icount), 0x00, sizeof(mos7840_port->icount));
1081
1082 /* initialize our port settings */
1083 mos7840_port->shadowMCR = MCR_MASTER_IE; /* Must set to enable ints! */
1084 /* send a open port command */
1085 mos7840_port->open = 1;
1086 //mos7840_change_port_settings(mos7840_port,old_termios);
1087 mos7840_port->icount.tx = 0;
1088 mos7840_port->icount.rx = 0;
1089
1090 dbg("\n\nusb_serial serial:%x mos7840_port:%x\n usb_serial_port port:%x\n\n", (unsigned int)serial, (unsigned int)mos7840_port, (unsigned int)port);
1091
1092 return 0;
1093
1094 }
1095
1096 /*****************************************************************************
1097 * mos7840_chars_in_buffer
1098 * this function is called by the tty driver when it wants to know how many
1099 * bytes of data we currently have outstanding in the port (data that has
1100 * been written, but hasn't made it out the port yet)
1101 * If successful, we return the number of bytes left to be written in the
1102 * system,
1103 * Otherwise we return a negative error number.
1104 *****************************************************************************/
1105
1106 static int mos7840_chars_in_buffer(struct usb_serial_port *port)
1107 {
1108 int i;
1109 int chars = 0;
1110 struct moschip_port *mos7840_port;
1111
1112 dbg("%s \n", " mos7840_chars_in_buffer:entering ...........");
1113
1114 if (mos7840_port_paranoia_check(port, __FUNCTION__)) {
1115 dbg("%s", "Invalid port \n");
1116 return -1;
1117 }
1118
1119 mos7840_port = mos7840_get_port_private(port);
1120 if (mos7840_port == NULL) {
1121 dbg("%s \n", "mos7840_break:leaving ...........");
1122 return -1;
1123 }
1124
1125 for (i = 0; i < NUM_URBS; ++i) {
1126 if (mos7840_port->write_urb_pool[i]->status == -EINPROGRESS) {
1127 chars += URB_TRANSFER_BUFFER_SIZE;
1128 }
1129 }
1130 dbg("%s - returns %d", __FUNCTION__, chars);
1131 return (chars);
1132
1133 }
1134
1135 /************************************************************************
1136 *
1137 * mos7840_block_until_tx_empty
1138 *
1139 * This function will block the close until one of the following:
1140 * 1. TX count are 0
1141 * 2. The mos7840 has stopped
1142 * 3. A timout of 3 seconds without activity has expired
1143 *
1144 ************************************************************************/
1145 static void mos7840_block_until_tx_empty(struct moschip_port *mos7840_port)
1146 {
1147 int timeout = HZ / 10;
1148 int wait = 30;
1149 int count;
1150
1151 while (1) {
1152
1153 count = mos7840_chars_in_buffer(mos7840_port->port);
1154
1155 /* Check for Buffer status */
1156 if (count <= 0) {
1157 return;
1158 }
1159
1160 /* Block the thread for a while */
1161 interruptible_sleep_on_timeout(&mos7840_port->wait_chase,
1162 timeout);
1163
1164 /* No activity.. count down section */
1165 wait--;
1166 if (wait == 0) {
1167 dbg("%s - TIMEOUT", __FUNCTION__);
1168 return;
1169 } else {
1170 /* Reset timout value back to seconds */
1171 wait = 30;
1172 }
1173 }
1174 }
1175
1176 /*****************************************************************************
1177 * mos7840_close
1178 * this function is called by the tty driver when a port is closed
1179 *****************************************************************************/
1180
1181 static void mos7840_close(struct usb_serial_port *port, struct file *filp)
1182 {
1183 struct usb_serial *serial;
1184 struct moschip_port *mos7840_port;
1185 int j;
1186 __u16 Data;
1187
1188 dbg("%s\n", "mos7840_close:entering...");
1189
1190 if (mos7840_port_paranoia_check(port, __FUNCTION__)) {
1191 dbg("%s", "Port Paranoia failed \n");
1192 return;
1193 }
1194
1195 serial = mos7840_get_usb_serial(port, __FUNCTION__);
1196 if (!serial) {
1197 dbg("%s", "Serial Paranoia failed \n");
1198 return;
1199 }
1200
1201 mos7840_port = mos7840_get_port_private(port);
1202
1203 if (mos7840_port == NULL) {
1204 return;
1205 }
1206
1207 for (j = 0; j < NUM_URBS; ++j)
1208 usb_kill_urb(mos7840_port->write_urb_pool[j]);
1209
1210 /* Freeing Write URBs */
1211 for (j = 0; j < NUM_URBS; ++j) {
1212 if (mos7840_port->write_urb_pool[j]) {
1213 if (mos7840_port->write_urb_pool[j]->transfer_buffer)
1214 kfree(mos7840_port->write_urb_pool[j]->
1215 transfer_buffer);
1216
1217 usb_free_urb(mos7840_port->write_urb_pool[j]);
1218 }
1219 }
1220
1221 if (serial->dev) {
1222 /* flush and block until tx is empty */
1223 mos7840_block_until_tx_empty(mos7840_port);
1224 }
1225
1226 /* While closing port, shutdown all bulk read, write *
1227 * and interrupt read if they exists */
1228 if (serial->dev) {
1229
1230 if (mos7840_port->write_urb) {
1231 dbg("%s", "Shutdown bulk write\n");
1232 usb_kill_urb(mos7840_port->write_urb);
1233 }
1234
1235 if (mos7840_port->read_urb) {
1236 dbg("%s", "Shutdown bulk read\n");
1237 usb_kill_urb(mos7840_port->read_urb);
1238 }
1239 if ((&mos7840_port->control_urb)) {
1240 dbg("%s", "Shutdown control read\n");
1241 // usb_kill_urb (mos7840_port->control_urb);
1242
1243 }
1244 }
1245 // if(mos7840_port->ctrl_buf != NULL)
1246 // kfree(mos7840_port->ctrl_buf);
1247 mos7840_num_open_ports--;
1248 dbg("mos7840_num_open_ports in close%d:in port%d\n",
1249 mos7840_num_open_ports, port->number);
1250 if (mos7840_num_open_ports == 0) {
1251 if (serial->port[0]->interrupt_in_urb) {
1252 dbg("%s", "Shutdown interrupt_in_urb\n");
1253 }
1254 }
1255
1256 if (mos7840_port->write_urb) {
1257 /* if this urb had a transfer buffer already (old tx) free it */
1258
1259 if (mos7840_port->write_urb->transfer_buffer != NULL) {
1260 kfree(mos7840_port->write_urb->transfer_buffer);
1261 }
1262 usb_free_urb(mos7840_port->write_urb);
1263 }
1264
1265 Data = 0x0;
1266 mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER, Data);
1267
1268 Data = 0x00;
1269 mos7840_set_uart_reg(port, INTERRUPT_ENABLE_REGISTER, Data);
1270
1271 mos7840_port->open = 0;
1272
1273 dbg("%s \n", "Leaving ............");
1274 }
1275
1276 /************************************************************************
1277 *
1278 * mos7840_block_until_chase_response
1279 *
1280 * This function will block the close until one of the following:
1281 * 1. Response to our Chase comes from mos7840
1282 * 2. A timout of 10 seconds without activity has expired
1283 * (1K of mos7840 data @ 2400 baud ==> 4 sec to empty)
1284 *
1285 ************************************************************************/
1286
1287 static void mos7840_block_until_chase_response(struct moschip_port
1288 *mos7840_port)
1289 {
1290 int timeout = 1 * HZ;
1291 int wait = 10;
1292 int count;
1293
1294 while (1) {
1295 count = mos7840_chars_in_buffer(mos7840_port->port);
1296
1297 /* Check for Buffer status */
1298 if (count <= 0) {
1299 return;
1300 }
1301
1302 /* Block the thread for a while */
1303 interruptible_sleep_on_timeout(&mos7840_port->wait_chase,
1304 timeout);
1305 /* No activity.. count down section */
1306 wait--;
1307 if (wait == 0) {
1308 dbg("%s - TIMEOUT", __FUNCTION__);
1309 return;
1310 } else {
1311 /* Reset timout value back to seconds */
1312 wait = 10;
1313 }
1314 }
1315
1316 }
1317
1318 /*****************************************************************************
1319 * mos7840_break
1320 * this function sends a break to the port
1321 *****************************************************************************/
1322 static void mos7840_break(struct usb_serial_port *port, int break_state)
1323 {
1324 unsigned char data;
1325 struct usb_serial *serial;
1326 struct moschip_port *mos7840_port;
1327
1328 dbg("%s \n", "Entering ...........");
1329 dbg("mos7840_break: Start\n");
1330
1331 if (mos7840_port_paranoia_check(port, __FUNCTION__)) {
1332 dbg("%s", "Port Paranoia failed \n");
1333 return;
1334 }
1335
1336 serial = mos7840_get_usb_serial(port, __FUNCTION__);
1337 if (!serial) {
1338 dbg("%s", "Serial Paranoia failed \n");
1339 return;
1340 }
1341
1342 mos7840_port = mos7840_get_port_private(port);
1343
1344 if (mos7840_port == NULL) {
1345 return;
1346 }
1347
1348 if (serial->dev) {
1349
1350 /* flush and block until tx is empty */
1351 mos7840_block_until_chase_response(mos7840_port);
1352 }
1353
1354 if (break_state == -1) {
1355 data = mos7840_port->shadowLCR | LCR_SET_BREAK;
1356 } else {
1357 data = mos7840_port->shadowLCR & ~LCR_SET_BREAK;
1358 }
1359
1360 mos7840_port->shadowLCR = data;
1361 dbg("mcs7840_break mos7840_port->shadowLCR is %x\n",
1362 mos7840_port->shadowLCR);
1363 mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER,
1364 mos7840_port->shadowLCR);
1365
1366 return;
1367 }
1368
1369 /*****************************************************************************
1370 * mos7840_write_room
1371 * this function is called by the tty driver when it wants to know how many
1372 * bytes of data we can accept for a specific port.
1373 * If successful, we return the amount of room that we have for this port
1374 * Otherwise we return a negative error number.
1375 *****************************************************************************/
1376
1377 static int mos7840_write_room(struct usb_serial_port *port)
1378 {
1379 int i;
1380 int room = 0;
1381 struct moschip_port *mos7840_port;
1382
1383 dbg("%s \n", " mos7840_write_room:entering ...........");
1384
1385 if (mos7840_port_paranoia_check(port, __FUNCTION__)) {
1386 dbg("%s", "Invalid port \n");
1387 dbg("%s \n", " mos7840_write_room:leaving ...........");
1388 return -1;
1389 }
1390
1391 mos7840_port = mos7840_get_port_private(port);
1392 if (mos7840_port == NULL) {
1393 dbg("%s \n", "mos7840_break:leaving ...........");
1394 return -1;
1395 }
1396
1397 for (i = 0; i < NUM_URBS; ++i) {
1398 if (mos7840_port->write_urb_pool[i]->status != -EINPROGRESS) {
1399 room += URB_TRANSFER_BUFFER_SIZE;
1400 }
1401 }
1402
1403 dbg("%s - returns %d", __FUNCTION__, room);
1404 return (room);
1405
1406 }
1407
1408 /*****************************************************************************
1409 * mos7840_write
1410 * this function is called by the tty driver when data should be written to
1411 * the port.
1412 * If successful, we return the number of bytes written, otherwise we
1413 * return a negative error number.
1414 *****************************************************************************/
1415
1416 static int mos7840_write(struct usb_serial_port *port,
1417 const unsigned char *data, int count)
1418 {
1419 int status;
1420 int i;
1421 int bytes_sent = 0;
1422 int transfer_size;
1423 int from_user = 0;
1424
1425 struct moschip_port *mos7840_port;
1426 struct usb_serial *serial;
1427 struct urb *urb;
1428 //__u16 Data;
1429 const unsigned char *current_position = data;
1430 unsigned char *data1;
1431 dbg("%s \n", "entering ...........");
1432 //dbg("mos7840_write: mos7840_port->shadowLCR is %x\n",mos7840_port->shadowLCR);
1433
1434 #ifdef NOTMOS7840
1435 Data = 0x00;
1436 status = 0;
1437 status = mos7840_get_uart_reg(port, LINE_CONTROL_REGISTER, &Data);
1438 mos7840_port->shadowLCR = Data;
1439 dbg("mos7840_write: LINE_CONTROL_REGISTER is %x\n", Data);
1440 dbg("mos7840_write: mos7840_port->shadowLCR is %x\n",
1441 mos7840_port->shadowLCR);
1442
1443 //Data = 0x03;
1444 //status = mos7840_set_uart_reg(port,LINE_CONTROL_REGISTER,Data);
1445 //mos7840_port->shadowLCR=Data;//Need to add later
1446
1447 Data |= SERIAL_LCR_DLAB; //data latch enable in LCR 0x80
1448 status = 0;
1449 status = mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data);
1450
1451 //Data = 0x0c;
1452 //status = mos7840_set_uart_reg(port,DIVISOR_LATCH_LSB,Data);
1453 Data = 0x00;
1454 status = 0;
1455 status = mos7840_get_uart_reg(port, DIVISOR_LATCH_LSB, &Data);
1456 dbg("mos7840_write:DLL value is %x\n", Data);
1457
1458 Data = 0x0;
1459 status = 0;
1460 status = mos7840_get_uart_reg(port, DIVISOR_LATCH_MSB, &Data);
1461 dbg("mos7840_write:DLM value is %x\n", Data);
1462
1463 Data = Data & ~SERIAL_LCR_DLAB;
1464 dbg("mos7840_write: mos7840_port->shadowLCR is %x\n",
1465 mos7840_port->shadowLCR);
1466 status = 0;
1467 status = mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data);
1468 #endif
1469
1470 if (mos7840_port_paranoia_check(port, __FUNCTION__)) {
1471 dbg("%s", "Port Paranoia failed \n");
1472 return -1;
1473 }
1474
1475 serial = port->serial;
1476 if (mos7840_serial_paranoia_check(serial, __FUNCTION__)) {
1477 dbg("%s", "Serial Paranoia failed \n");
1478 return -1;
1479 }
1480
1481 mos7840_port = mos7840_get_port_private(port);
1482 if (mos7840_port == NULL) {
1483 dbg("%s", "mos7840_port is NULL\n");
1484 return -1;
1485 }
1486
1487 /* try to find a free urb in the list */
1488 urb = NULL;
1489
1490 for (i = 0; i < NUM_URBS; ++i) {
1491 if (mos7840_port->write_urb_pool[i]->status != -EINPROGRESS) {
1492 urb = mos7840_port->write_urb_pool[i];
1493 dbg("\nURB:%d", i);
1494 break;
1495 }
1496 }
1497
1498 if (urb == NULL) {
1499 dbg("%s - no more free urbs", __FUNCTION__);
1500 goto exit;
1501 }
1502
1503 if (urb->transfer_buffer == NULL) {
1504 urb->transfer_buffer =
1505 kmalloc(URB_TRANSFER_BUFFER_SIZE, GFP_KERNEL);
1506
1507 if (urb->transfer_buffer == NULL) {
1508 err("%s no more kernel memory...", __FUNCTION__);
1509 goto exit;
1510 }
1511 }
1512 transfer_size = min(count, URB_TRANSFER_BUFFER_SIZE);
1513
1514 if (from_user) {
1515 if (copy_from_user
1516 (urb->transfer_buffer, current_position, transfer_size)) {
1517 bytes_sent = -EFAULT;
1518 goto exit;
1519 }
1520 } else {
1521 memcpy(urb->transfer_buffer, current_position, transfer_size);
1522 }
1523
1524 /* fill urb with data and submit */
1525 usb_fill_bulk_urb(urb,
1526 serial->dev,
1527 usb_sndbulkpipe(serial->dev,
1528 port->bulk_out_endpointAddress),
1529 urb->transfer_buffer,
1530 transfer_size,
1531 mos7840_bulk_out_data_callback, mos7840_port);
1532
1533 data1 = urb->transfer_buffer;
1534 dbg("\nbulkout endpoint is %d", port->bulk_out_endpointAddress);
1535
1536 /* send it down the pipe */
1537 status = usb_submit_urb(urb, GFP_ATOMIC);
1538
1539 if (status) {
1540 err("%s - usb_submit_urb(write bulk) failed with status = %d",
1541 __FUNCTION__, status);
1542 bytes_sent = status;
1543 goto exit;
1544 }
1545 bytes_sent = transfer_size;
1546 mos7840_port->icount.tx += transfer_size;
1547 dbg("mos7840_port->icount.tx is %d:\n", mos7840_port->icount.tx);
1548 exit:
1549
1550 return bytes_sent;
1551
1552 }
1553
1554 /*****************************************************************************
1555 * mos7840_throttle
1556 * this function is called by the tty driver when it wants to stop the data
1557 * being read from the port.
1558 *****************************************************************************/
1559
1560 static void mos7840_throttle(struct usb_serial_port *port)
1561 {
1562 struct moschip_port *mos7840_port;
1563 struct tty_struct *tty;
1564 int status;
1565
1566 if (mos7840_port_paranoia_check(port, __FUNCTION__)) {
1567 dbg("%s", "Invalid port \n");
1568 return;
1569 }
1570
1571 dbg("- port %d\n", port->number);
1572
1573 mos7840_port = mos7840_get_port_private(port);
1574
1575 if (mos7840_port == NULL)
1576 return;
1577
1578 if (!mos7840_port->open) {
1579 dbg("%s\n", "port not opened");
1580 return;
1581 }
1582
1583 dbg("%s", "Entering .......... \n");
1584
1585 tty = port->tty;
1586 if (!tty) {
1587 dbg("%s - no tty available", __FUNCTION__);
1588 return;
1589 }
1590
1591 /* if we are implementing XON/XOFF, send the stop character */
1592 if (I_IXOFF(tty)) {
1593 unsigned char stop_char = STOP_CHAR(tty);
1594 status = mos7840_write(port, &stop_char, 1);
1595 if (status <= 0) {
1596 return;
1597 }
1598 }
1599
1600 /* if we are implementing RTS/CTS, toggle that line */
1601 if (tty->termios->c_cflag & CRTSCTS) {
1602 mos7840_port->shadowMCR &= ~MCR_RTS;
1603 status = 0;
1604 status =
1605 mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER,
1606 mos7840_port->shadowMCR);
1607
1608 if (status < 0) {
1609 return;
1610 }
1611 }
1612
1613 return;
1614 }
1615
1616 /*****************************************************************************
1617 * mos7840_unthrottle
1618 * this function is called by the tty driver when it wants to resume the data
1619 * being read from the port (called after SerialThrottle is called)
1620 *****************************************************************************/
1621 static void mos7840_unthrottle(struct usb_serial_port *port)
1622 {
1623 struct tty_struct *tty;
1624 int status;
1625 struct moschip_port *mos7840_port = mos7840_get_port_private(port);
1626
1627 if (mos7840_port_paranoia_check(port, __FUNCTION__)) {
1628 dbg("%s", "Invalid port \n");
1629 return;
1630 }
1631
1632 if (mos7840_port == NULL)
1633 return;
1634
1635 if (!mos7840_port->open) {
1636 dbg("%s - port not opened", __FUNCTION__);
1637 return;
1638 }
1639
1640 dbg("%s", "Entering .......... \n");
1641
1642 tty = port->tty;
1643 if (!tty) {
1644 dbg("%s - no tty available", __FUNCTION__);
1645 return;
1646 }
1647
1648 /* if we are implementing XON/XOFF, send the start character */
1649 if (I_IXOFF(tty)) {
1650 unsigned char start_char = START_CHAR(tty);
1651 status = mos7840_write(port, &start_char, 1);
1652 if (status <= 0) {
1653 return;
1654 }
1655 }
1656
1657 /* if we are implementing RTS/CTS, toggle that line */
1658 if (tty->termios->c_cflag & CRTSCTS) {
1659 mos7840_port->shadowMCR |= MCR_RTS;
1660 status = 0;
1661 status =
1662 mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER,
1663 mos7840_port->shadowMCR);
1664 if (status < 0) {
1665 return;
1666 }
1667 }
1668
1669 return;
1670 }
1671
1672 static int mos7840_tiocmget(struct usb_serial_port *port, struct file *file)
1673 {
1674 struct moschip_port *mos7840_port;
1675 unsigned int result;
1676 __u16 msr;
1677 __u16 mcr;
1678 int status = 0;
1679 mos7840_port = mos7840_get_port_private(port);
1680
1681 dbg("%s - port %d", __FUNCTION__, port->number);
1682
1683 if (mos7840_port == NULL)
1684 return -ENODEV;
1685
1686 status = mos7840_get_uart_reg(port, MODEM_STATUS_REGISTER, &msr);
1687 status = mos7840_get_uart_reg(port, MODEM_CONTROL_REGISTER, &mcr);
1688 result = ((mcr & MCR_DTR) ? TIOCM_DTR : 0)
1689 | ((mcr & MCR_RTS) ? TIOCM_RTS : 0)
1690 | ((mcr & MCR_LOOPBACK) ? TIOCM_LOOP : 0)
1691 | ((msr & MOS7840_MSR_CTS) ? TIOCM_CTS : 0)
1692 | ((msr & MOS7840_MSR_CD) ? TIOCM_CAR : 0)
1693 | ((msr & MOS7840_MSR_RI) ? TIOCM_RI : 0)
1694 | ((msr & MOS7840_MSR_DSR) ? TIOCM_DSR : 0);
1695
1696 dbg("%s - 0x%04X", __FUNCTION__, result);
1697
1698 return result;
1699 }
1700
1701 static int mos7840_tiocmset(struct usb_serial_port *port, struct file *file,
1702 unsigned int set, unsigned int clear)
1703 {
1704 struct moschip_port *mos7840_port;
1705 unsigned int mcr;
1706 unsigned int status;
1707
1708 dbg("%s - port %d", __FUNCTION__, port->number);
1709
1710 mos7840_port = mos7840_get_port_private(port);
1711
1712 if (mos7840_port == NULL)
1713 return -ENODEV;
1714
1715 mcr = mos7840_port->shadowMCR;
1716 if (clear & TIOCM_RTS)
1717 mcr &= ~MCR_RTS;
1718 if (clear & TIOCM_DTR)
1719 mcr &= ~MCR_DTR;
1720 if (clear & TIOCM_LOOP)
1721 mcr &= ~MCR_LOOPBACK;
1722
1723 if (set & TIOCM_RTS)
1724 mcr |= MCR_RTS;
1725 if (set & TIOCM_DTR)
1726 mcr |= MCR_DTR;
1727 if (set & TIOCM_LOOP)
1728 mcr |= MCR_LOOPBACK;
1729
1730 mos7840_port->shadowMCR = mcr;
1731
1732 status = 0;
1733 status = mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER, mcr);
1734 if (status < 0) {
1735 dbg("setting MODEM_CONTROL_REGISTER Failed\n");
1736 return -1;
1737 }
1738
1739 return 0;
1740 }
1741
1742 /*****************************************************************************
1743 * mos7840_calc_baud_rate_divisor
1744 * this function calculates the proper baud rate divisor for the specified
1745 * baud rate.
1746 *****************************************************************************/
1747 static int mos7840_calc_baud_rate_divisor(int baudRate, int *divisor,
1748 __u16 * clk_sel_val)
1749 {
1750
1751 dbg("%s - %d", __FUNCTION__, baudRate);
1752
1753 if (baudRate <= 115200) {
1754 *divisor = 115200 / baudRate;
1755 *clk_sel_val = 0x0;
1756 }
1757 if ((baudRate > 115200) && (baudRate <= 230400)) {
1758 *divisor = 230400 / baudRate;
1759 *clk_sel_val = 0x10;
1760 } else if ((baudRate > 230400) && (baudRate <= 403200)) {
1761 *divisor = 403200 / baudRate;
1762 *clk_sel_val = 0x20;
1763 } else if ((baudRate > 403200) && (baudRate <= 460800)) {
1764 *divisor = 460800 / baudRate;
1765 *clk_sel_val = 0x30;
1766 } else if ((baudRate > 460800) && (baudRate <= 806400)) {
1767 *divisor = 806400 / baudRate;
1768 *clk_sel_val = 0x40;
1769 } else if ((baudRate > 806400) && (baudRate <= 921600)) {
1770 *divisor = 921600 / baudRate;
1771 *clk_sel_val = 0x50;
1772 } else if ((baudRate > 921600) && (baudRate <= 1572864)) {
1773 *divisor = 1572864 / baudRate;
1774 *clk_sel_val = 0x60;
1775 } else if ((baudRate > 1572864) && (baudRate <= 3145728)) {
1776 *divisor = 3145728 / baudRate;
1777 *clk_sel_val = 0x70;
1778 }
1779 return 0;
1780
1781 #ifdef NOTMCS7840
1782
1783 for (i = 0; i < ARRAY_SIZE(mos7840_divisor_table); i++) {
1784 if (mos7840_divisor_table[i].BaudRate == baudrate) {
1785 *divisor = mos7840_divisor_table[i].Divisor;
1786 return 0;
1787 }
1788 }
1789
1790 /* After trying for all the standard baud rates *
1791 * Try calculating the divisor for this baud rate */
1792
1793 if (baudrate > 75 && baudrate < 230400) {
1794 /* get the divisor */
1795 custom = (__u16) (230400L / baudrate);
1796
1797 /* Check for round off */
1798 round1 = (__u16) (2304000L / baudrate);
1799 round = (__u16) (round1 - (custom * 10));
1800 if (round > 4) {
1801 custom++;
1802 }
1803 *divisor = custom;
1804
1805 dbg(" Baud %d = %d\n", baudrate, custom);
1806 return 0;
1807 }
1808
1809 dbg("%s\n", " Baud calculation Failed...");
1810 return -1;
1811 #endif
1812 }
1813
1814 /*****************************************************************************
1815 * mos7840_send_cmd_write_baud_rate
1816 * this function sends the proper command to change the baud rate of the
1817 * specified port.
1818 *****************************************************************************/
1819
1820 static int mos7840_send_cmd_write_baud_rate(struct moschip_port *mos7840_port,
1821 int baudRate)
1822 {
1823 int divisor = 0;
1824 int status;
1825 __u16 Data;
1826 unsigned char number;
1827 __u16 clk_sel_val;
1828 struct usb_serial_port *port;
1829
1830 if (mos7840_port == NULL)
1831 return -1;
1832
1833 port = (struct usb_serial_port *)mos7840_port->port;
1834 if (mos7840_port_paranoia_check(port, __FUNCTION__)) {
1835 dbg("%s", "Invalid port \n");
1836 return -1;
1837 }
1838
1839 if (mos7840_serial_paranoia_check(port->serial, __FUNCTION__)) {
1840 dbg("%s", "Invalid Serial \n");
1841 return -1;
1842 }
1843
1844 dbg("%s", "Entering .......... \n");
1845
1846 number = mos7840_port->port->number - mos7840_port->port->serial->minor;
1847
1848 dbg("%s - port = %d, baud = %d", __FUNCTION__,
1849 mos7840_port->port->number, baudRate);
1850 //reset clk_uart_sel in spregOffset
1851 if (baudRate > 115200) {
1852 #ifdef HW_flow_control
1853 //NOTE: need to see the pther register to modify
1854 //setting h/w flow control bit to 1;
1855 status = 0;
1856 Data = 0x2b;
1857 mos7840_port->shadowMCR = Data;
1858 status =
1859 mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER, Data);
1860 if (status < 0) {
1861 dbg("Writing spreg failed in set_serial_baud\n");
1862 return -1;
1863 }
1864 #endif
1865
1866 } else {
1867 #ifdef HW_flow_control
1868 //setting h/w flow control bit to 0;
1869 status = 0;
1870 Data = 0xb;
1871 mos7840_port->shadowMCR = Data;
1872 status =
1873 mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER, Data);
1874 if (status < 0) {
1875 dbg("Writing spreg failed in set_serial_baud\n");
1876 return -1;
1877 }
1878 #endif
1879
1880 }
1881
1882 if (1) //baudRate <= 115200)
1883 {
1884 clk_sel_val = 0x0;
1885 Data = 0x0;
1886 status = 0;
1887 status =
1888 mos7840_calc_baud_rate_divisor(baudRate, &divisor,
1889 &clk_sel_val);
1890 status =
1891 mos7840_get_reg_sync(port, mos7840_port->SpRegOffset,
1892 &Data);
1893 if (status < 0) {
1894 dbg("reading spreg failed in set_serial_baud\n");
1895 return -1;
1896 }
1897 Data = (Data & 0x8f) | clk_sel_val;
1898 status = 0;
1899 status =
1900 mos7840_set_reg_sync(port, mos7840_port->SpRegOffset, Data);
1901 if (status < 0) {
1902 dbg("Writing spreg failed in set_serial_baud\n");
1903 return -1;
1904 }
1905 /* Calculate the Divisor */
1906
1907 if (status) {
1908 err("%s - bad baud rate", __FUNCTION__);
1909 dbg("%s\n", "bad baud rate");
1910 return status;
1911 }
1912 /* Enable access to divisor latch */
1913 Data = mos7840_port->shadowLCR | SERIAL_LCR_DLAB;
1914 mos7840_port->shadowLCR = Data;
1915 mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data);
1916
1917 /* Write the divisor */
1918 Data = (unsigned char)(divisor & 0xff);
1919 dbg("set_serial_baud Value to write DLL is %x\n", Data);
1920 mos7840_set_uart_reg(port, DIVISOR_LATCH_LSB, Data);
1921
1922 Data = (unsigned char)((divisor & 0xff00) >> 8);
1923 dbg("set_serial_baud Value to write DLM is %x\n", Data);
1924 mos7840_set_uart_reg(port, DIVISOR_LATCH_MSB, Data);
1925
1926 /* Disable access to divisor latch */
1927 Data = mos7840_port->shadowLCR & ~SERIAL_LCR_DLAB;
1928 mos7840_port->shadowLCR = Data;
1929 mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data);
1930
1931 }
1932
1933 return status;
1934 }
1935
1936 /*****************************************************************************
1937 * mos7840_change_port_settings
1938 * This routine is called to set the UART on the device to match
1939 * the specified new settings.
1940 *****************************************************************************/
1941
1942 static void mos7840_change_port_settings(struct moschip_port *mos7840_port,
1943 struct termios *old_termios)
1944 {
1945 struct tty_struct *tty;
1946 int baud;
1947 unsigned cflag;
1948 unsigned iflag;
1949 __u8 lData;
1950 __u8 lParity;
1951 __u8 lStop;
1952 int status;
1953 __u16 Data;
1954 struct usb_serial_port *port;
1955 struct usb_serial *serial;
1956
1957 if (mos7840_port == NULL)
1958 return;
1959
1960 port = (struct usb_serial_port *)mos7840_port->port;
1961
1962 if (mos7840_port_paranoia_check(port, __FUNCTION__)) {
1963 dbg("%s", "Invalid port \n");
1964 return;
1965 }
1966
1967 if (mos7840_serial_paranoia_check(port->serial, __FUNCTION__)) {
1968 dbg("%s", "Invalid Serial \n");
1969 return;
1970 }
1971
1972 serial = port->serial;
1973
1974 dbg("%s - port %d", __FUNCTION__, mos7840_port->port->number);
1975
1976 if (!mos7840_port->open) {
1977 dbg("%s - port not opened", __FUNCTION__);
1978 return;
1979 }
1980
1981 tty = mos7840_port->port->tty;
1982
1983 if ((!tty) || (!tty->termios)) {
1984 dbg("%s - no tty structures", __FUNCTION__);
1985 return;
1986 }
1987
1988 dbg("%s", "Entering .......... \n");
1989
1990 lData = LCR_BITS_8;
1991 lStop = LCR_STOP_1;
1992 lParity = LCR_PAR_NONE;
1993
1994 cflag = tty->termios->c_cflag;
1995 iflag = tty->termios->c_iflag;
1996
1997 /* Change the number of bits */
1998 if (cflag & CSIZE) {
1999 switch (cflag & CSIZE) {
2000 case CS5:
2001 lData = LCR_BITS_5;
2002 break;
2003
2004 case CS6:
2005 lData = LCR_BITS_6;
2006 break;
2007
2008 case CS7:
2009 lData = LCR_BITS_7;
2010 break;
2011 default:
2012 case CS8:
2013 lData = LCR_BITS_8;
2014 break;
2015 }
2016 }
2017 /* Change the Parity bit */
2018 if (cflag & PARENB) {
2019 if (cflag & PARODD) {
2020 lParity = LCR_PAR_ODD;
2021 dbg("%s - parity = odd", __FUNCTION__);
2022 } else {
2023 lParity = LCR_PAR_EVEN;
2024 dbg("%s - parity = even", __FUNCTION__);
2025 }
2026
2027 } else {
2028 dbg("%s - parity = none", __FUNCTION__);
2029 }
2030
2031 if (cflag & CMSPAR) {
2032 lParity = lParity | 0x20;
2033 }
2034
2035 /* Change the Stop bit */
2036 if (cflag & CSTOPB) {
2037 lStop = LCR_STOP_2;
2038 dbg("%s - stop bits = 2", __FUNCTION__);
2039 } else {
2040 lStop = LCR_STOP_1;
2041 dbg("%s - stop bits = 1", __FUNCTION__);
2042 }
2043
2044 /* Update the LCR with the correct value */
2045 mos7840_port->shadowLCR &=
2046 ~(LCR_BITS_MASK | LCR_STOP_MASK | LCR_PAR_MASK);
2047 mos7840_port->shadowLCR |= (lData | lParity | lStop);
2048
2049 dbg("mos7840_change_port_settings mos7840_port->shadowLCR is %x\n",
2050 mos7840_port->shadowLCR);
2051 /* Disable Interrupts */
2052 Data = 0x00;
2053 mos7840_set_uart_reg(port, INTERRUPT_ENABLE_REGISTER, Data);
2054
2055 Data = 0x00;
2056 mos7840_set_uart_reg(port, FIFO_CONTROL_REGISTER, Data);
2057
2058 Data = 0xcf;
2059 mos7840_set_uart_reg(port, FIFO_CONTROL_REGISTER, Data);
2060
2061 /* Send the updated LCR value to the mos7840 */
2062 Data = mos7840_port->shadowLCR;
2063
2064 mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data);
2065
2066 Data = 0x00b;
2067 mos7840_port->shadowMCR = Data;
2068 mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER, Data);
2069 Data = 0x00b;
2070 mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER, Data);
2071
2072 /* set up the MCR register and send it to the mos7840 */
2073
2074 mos7840_port->shadowMCR = MCR_MASTER_IE;
2075 if (cflag & CBAUD) {
2076 mos7840_port->shadowMCR |= (MCR_DTR | MCR_RTS);
2077 }
2078
2079 if (cflag & CRTSCTS) {
2080 mos7840_port->shadowMCR |= (MCR_XON_ANY);
2081
2082 } else {
2083 mos7840_port->shadowMCR &= ~(MCR_XON_ANY);
2084 }
2085
2086 Data = mos7840_port->shadowMCR;
2087 mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER, Data);
2088
2089 /* Determine divisor based on baud rate */
2090 baud = tty_get_baud_rate(tty);
2091
2092 if (!baud) {
2093 /* pick a default, any default... */
2094 dbg("%s\n", "Picked default baud...");
2095 baud = 9600;
2096 }
2097
2098 dbg("%s - baud rate = %d", __FUNCTION__, baud);
2099 status = mos7840_send_cmd_write_baud_rate(mos7840_port, baud);
2100
2101 /* Enable Interrupts */
2102 Data = 0x0c;
2103 mos7840_set_uart_reg(port, INTERRUPT_ENABLE_REGISTER, Data);
2104
2105 if (mos7840_port->read_urb->status != -EINPROGRESS) {
2106 mos7840_port->read_urb->dev = serial->dev;
2107
2108 status = usb_submit_urb(mos7840_port->read_urb, GFP_ATOMIC);
2109
2110 if (status) {
2111 dbg(" usb_submit_urb(read bulk) failed, status = %d",
2112 status);
2113 }
2114 }
2115 wake_up(&mos7840_port->delta_msr_wait);
2116 mos7840_port->delta_msr_cond = 1;
2117 dbg("mos7840_change_port_settings mos7840_port->shadowLCR is End %x\n",
2118 mos7840_port->shadowLCR);
2119
2120 return;
2121 }
2122
2123 /*****************************************************************************
2124 * mos7840_set_termios
2125 * this function is called by the tty driver when it wants to change
2126 * the termios structure
2127 *****************************************************************************/
2128
2129 static void mos7840_set_termios(struct usb_serial_port *port,
2130 struct termios *old_termios)
2131 {
2132 int status;
2133 unsigned int cflag;
2134 struct usb_serial *serial;
2135 struct moschip_port *mos7840_port;
2136 struct tty_struct *tty;
2137 dbg("mos7840_set_termios: START\n");
2138 if (mos7840_port_paranoia_check(port, __FUNCTION__)) {
2139 dbg("%s", "Invalid port \n");
2140 return;
2141 }
2142
2143 serial = port->serial;
2144
2145 if (mos7840_serial_paranoia_check(serial, __FUNCTION__)) {
2146 dbg("%s", "Invalid Serial \n");
2147 return;
2148 }
2149
2150 mos7840_port = mos7840_get_port_private(port);
2151
2152 if (mos7840_port == NULL)
2153 return;
2154
2155 tty = port->tty;
2156
2157 if (!port->tty || !port->tty->termios) {
2158 dbg("%s - no tty or termios", __FUNCTION__);
2159 return;
2160 }
2161
2162 if (!mos7840_port->open) {
2163 dbg("%s - port not opened", __FUNCTION__);
2164 return;
2165 }
2166
2167 dbg("%s\n", "setting termios - ");
2168
2169 cflag = tty->termios->c_cflag;
2170
2171 if (!cflag) {
2172 dbg("%s %s\n", __FUNCTION__, "cflag is NULL");
2173 return;
2174 }
2175
2176 /* check that they really want us to change something */
2177 if (old_termios) {
2178 if ((cflag == old_termios->c_cflag) &&
2179 (RELEVANT_IFLAG(tty->termios->c_iflag) ==
2180 RELEVANT_IFLAG(old_termios->c_iflag))) {
2181 dbg("%s\n", "Nothing to change");
2182 return;
2183 }
2184 }
2185
2186 dbg("%s - clfag %08x iflag %08x", __FUNCTION__,
2187 tty->termios->c_cflag, RELEVANT_IFLAG(tty->termios->c_iflag));
2188
2189 if (old_termios) {
2190 dbg("%s - old clfag %08x old iflag %08x", __FUNCTION__,
2191 old_termios->c_cflag, RELEVANT_IFLAG(old_termios->c_iflag));
2192 }
2193
2194 dbg("%s - port %d", __FUNCTION__, port->number);
2195
2196 /* change the port settings to the new ones specified */
2197
2198 mos7840_change_port_settings(mos7840_port, old_termios);
2199
2200 if (!mos7840_port->read_urb) {
2201 dbg("%s", "URB KILLED !!!!!\n");
2202 return;
2203 }
2204
2205 if (mos7840_port->read_urb->status != -EINPROGRESS) {
2206 mos7840_port->read_urb->dev = serial->dev;
2207 status = usb_submit_urb(mos7840_port->read_urb, GFP_ATOMIC);
2208 if (status) {
2209 dbg(" usb_submit_urb(read bulk) failed, status = %d",
2210 status);
2211 }
2212 }
2213 return;
2214 }
2215
2216 /*****************************************************************************
2217 * mos7840_get_lsr_info - get line status register info
2218 *
2219 * Purpose: Let user call ioctl() to get info when the UART physically
2220 * is emptied. On bus types like RS485, the transmitter must
2221 * release the bus after transmitting. This must be done when
2222 * the transmit shift register is empty, not be done when the
2223 * transmit holding register is empty. This functionality
2224 * allows an RS485 driver to be written in user space.
2225 *****************************************************************************/
2226
2227 static int mos7840_get_lsr_info(struct moschip_port *mos7840_port,
2228 unsigned int *value)
2229 {
2230 int count;
2231 unsigned int result = 0;
2232
2233 count = mos7840_chars_in_buffer(mos7840_port->port);
2234 if (count == 0) {
2235 dbg("%s -- Empty", __FUNCTION__);
2236 result = TIOCSER_TEMT;
2237 }
2238
2239 if (copy_to_user(value, &result, sizeof(int)))
2240 return -EFAULT;
2241 return 0;
2242 }
2243
2244 /*****************************************************************************
2245 * mos7840_get_bytes_avail - get number of bytes available
2246 *
2247 * Purpose: Let user call ioctl to get the count of number of bytes available.
2248 *****************************************************************************/
2249
2250 static int mos7840_get_bytes_avail(struct moschip_port *mos7840_port,
2251 unsigned int *value)
2252 {
2253 unsigned int result = 0;
2254 struct tty_struct *tty = mos7840_port->port->tty;
2255
2256 if (!tty)
2257 return -ENOIOCTLCMD;
2258
2259 result = tty->read_cnt;
2260
2261 dbg("%s(%d) = %d", __FUNCTION__, mos7840_port->port->number, result);
2262 if (copy_to_user(value, &result, sizeof(int)))
2263 return -EFAULT;
2264
2265 return -ENOIOCTLCMD;
2266 }
2267
2268 /*****************************************************************************
2269 * mos7840_set_modem_info
2270 * function to set modem info
2271 *****************************************************************************/
2272
2273 static int mos7840_set_modem_info(struct moschip_port *mos7840_port,
2274 unsigned int cmd, unsigned int *value)
2275 {
2276 unsigned int mcr;
2277 unsigned int arg;
2278 __u16 Data;
2279 int status;
2280 struct usb_serial_port *port;
2281
2282 if (mos7840_port == NULL)
2283 return -1;
2284
2285 port = (struct usb_serial_port *)mos7840_port->port;
2286 if (mos7840_port_paranoia_check(port, __FUNCTION__)) {
2287 dbg("%s", "Invalid port \n");
2288 return -1;
2289 }
2290
2291 mcr = mos7840_port->shadowMCR;
2292
2293 if (copy_from_user(&arg, value, sizeof(int)))
2294 return -EFAULT;
2295
2296 switch (cmd) {
2297 case TIOCMBIS:
2298 if (arg & TIOCM_RTS)
2299 mcr |= MCR_RTS;
2300 if (arg & TIOCM_DTR)
2301 mcr |= MCR_RTS;
2302 if (arg & TIOCM_LOOP)
2303 mcr |= MCR_LOOPBACK;
2304 break;
2305
2306 case TIOCMBIC:
2307 if (arg & TIOCM_RTS)
2308 mcr &= ~MCR_RTS;
2309 if (arg & TIOCM_DTR)
2310 mcr &= ~MCR_RTS;
2311 if (arg & TIOCM_LOOP)
2312 mcr &= ~MCR_LOOPBACK;
2313 break;
2314
2315 case TIOCMSET:
2316 /* turn off the RTS and DTR and LOOPBACK
2317 * and then only turn on what was asked to */
2318 mcr &= ~(MCR_RTS | MCR_DTR | MCR_LOOPBACK);
2319 mcr |= ((arg & TIOCM_RTS) ? MCR_RTS : 0);
2320 mcr |= ((arg & TIOCM_DTR) ? MCR_DTR : 0);
2321 mcr |= ((arg & TIOCM_LOOP) ? MCR_LOOPBACK : 0);
2322 break;
2323 }
2324
2325 mos7840_port->shadowMCR = mcr;
2326
2327 Data = mos7840_port->shadowMCR;
2328 status = 0;
2329 status = mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER, Data);
2330 if (status < 0) {
2331 dbg("setting MODEM_CONTROL_REGISTER Failed\n");
2332 return -1;
2333 }
2334
2335 return 0;
2336 }
2337
2338 /*****************************************************************************
2339 * mos7840_get_modem_info
2340 * function to get modem info
2341 *****************************************************************************/
2342
2343 static int mos7840_get_modem_info(struct moschip_port *mos7840_port,
2344 unsigned int *value)
2345 {
2346 unsigned int result = 0;
2347 __u16 msr;
2348 unsigned int mcr = mos7840_port->shadowMCR;
2349 int status = 0;
2350 status =
2351 mos7840_get_uart_reg(mos7840_port->port, MODEM_STATUS_REGISTER,
2352 &msr);
2353 result = ((mcr & MCR_DTR) ? TIOCM_DTR : 0) /* 0x002 */
2354 |((mcr & MCR_RTS) ? TIOCM_RTS : 0) /* 0x004 */
2355 |((msr & MOS7840_MSR_CTS) ? TIOCM_CTS : 0) /* 0x020 */
2356 |((msr & MOS7840_MSR_CD) ? TIOCM_CAR : 0) /* 0x040 */
2357 |((msr & MOS7840_MSR_RI) ? TIOCM_RI : 0) /* 0x080 */
2358 |((msr & MOS7840_MSR_DSR) ? TIOCM_DSR : 0); /* 0x100 */
2359
2360 dbg("%s -- %x", __FUNCTION__, result);
2361
2362 if (copy_to_user(value, &result, sizeof(int)))
2363 return -EFAULT;
2364 return 0;
2365 }
2366
2367 /*****************************************************************************
2368 * mos7840_get_serial_info
2369 * function to get information about serial port
2370 *****************************************************************************/
2371
2372 static int mos7840_get_serial_info(struct moschip_port *mos7840_port,
2373 struct serial_struct *retinfo)
2374 {
2375 struct serial_struct tmp;
2376
2377 if (mos7840_port == NULL)
2378 return -1;
2379
2380 if (!retinfo)
2381 return -EFAULT;
2382
2383 memset(&tmp, 0, sizeof(tmp));
2384
2385 tmp.type = PORT_16550A;
2386 tmp.line = mos7840_port->port->serial->minor;
2387 tmp.port = mos7840_port->port->number;
2388 tmp.irq = 0;
2389 tmp.flags = ASYNC_SKIP_TEST | ASYNC_AUTO_IRQ;
2390 tmp.xmit_fifo_size = NUM_URBS * URB_TRANSFER_BUFFER_SIZE;
2391 tmp.baud_base = 9600;
2392 tmp.close_delay = 5 * HZ;
2393 tmp.closing_wait = 30 * HZ;
2394
2395 if (copy_to_user(retinfo, &tmp, sizeof(*retinfo)))
2396 return -EFAULT;
2397 return 0;
2398 }
2399
2400 /*****************************************************************************
2401 * SerialIoctl
2402 * this function handles any ioctl calls to the driver
2403 *****************************************************************************/
2404
2405 static int mos7840_ioctl(struct usb_serial_port *port, struct file *file,
2406 unsigned int cmd, unsigned long arg)
2407 {
2408 struct moschip_port *mos7840_port;
2409 struct tty_struct *tty;
2410
2411 struct async_icount cnow;
2412 struct async_icount cprev;
2413 struct serial_icounter_struct icount;
2414 int mosret = 0;
2415 int retval;
2416 struct tty_ldisc *ld;
2417
2418 if (mos7840_port_paranoia_check(port, __FUNCTION__)) {
2419 dbg("%s", "Invalid port \n");
2420 return -1;
2421 }
2422
2423 mos7840_port = mos7840_get_port_private(port);
2424 tty = mos7840_port->port->tty;
2425
2426 if (mos7840_port == NULL)
2427 return -1;
2428
2429 dbg("%s - port %d, cmd = 0x%x", __FUNCTION__, port->number, cmd);
2430
2431 switch (cmd) {
2432 /* return number of bytes available */
2433
2434 case TIOCINQ:
2435 dbg("%s (%d) TIOCINQ", __FUNCTION__, port->number);
2436 return mos7840_get_bytes_avail(mos7840_port,
2437 (unsigned int *)arg);
2438 break;
2439
2440 case TIOCOUTQ:
2441 dbg("%s (%d) TIOCOUTQ", __FUNCTION__, port->number);
2442 return put_user(tty->driver->chars_in_buffer ?
2443 tty->driver->chars_in_buffer(tty) : 0,
2444 (int __user *)arg);
2445 break;
2446
2447 case TCFLSH:
2448 retval = tty_check_change(tty);
2449 if (retval)
2450 return retval;
2451
2452 ld = tty_ldisc_ref(tty);
2453 switch (arg) {
2454 case TCIFLUSH:
2455 if (ld && ld->flush_buffer)
2456 ld->flush_buffer(tty);
2457 break;
2458 case TCIOFLUSH:
2459 if (ld && ld->flush_buffer)
2460 ld->flush_buffer(tty);
2461 /* fall through */
2462 case TCOFLUSH:
2463 if (tty->driver->flush_buffer)
2464 tty->driver->flush_buffer(tty);
2465 break;
2466 default:
2467 tty_ldisc_deref(ld);
2468 return -EINVAL;
2469 }
2470 tty_ldisc_deref(ld);
2471 return 0;
2472
2473 case TCGETS:
2474 if (kernel_termios_to_user_termios
2475 ((struct termios __user *)arg, tty->termios))
2476 return -EFAULT;
2477 return 0;
2478
2479 case TIOCSERGETLSR:
2480 dbg("%s (%d) TIOCSERGETLSR", __FUNCTION__, port->number);
2481 return mos7840_get_lsr_info(mos7840_port, (unsigned int *)arg);
2482 return 0;
2483
2484 case TIOCMBIS:
2485 case TIOCMBIC:
2486 case TIOCMSET:
2487 dbg("%s (%d) TIOCMSET/TIOCMBIC/TIOCMSET", __FUNCTION__,
2488 port->number);
2489 mosret =
2490 mos7840_set_modem_info(mos7840_port, cmd,
2491 (unsigned int *)arg);
2492 return mosret;
2493
2494 case TIOCMGET:
2495 dbg("%s (%d) TIOCMGET", __FUNCTION__, port->number);
2496 return mos7840_get_modem_info(mos7840_port,
2497 (unsigned int *)arg);
2498
2499 case TIOCGSERIAL:
2500 dbg("%s (%d) TIOCGSERIAL", __FUNCTION__, port->number);
2501 return mos7840_get_serial_info(mos7840_port,
2502 (struct serial_struct *)arg);
2503
2504 case TIOCSSERIAL:
2505 dbg("%s (%d) TIOCSSERIAL", __FUNCTION__, port->number);
2506 break;
2507
2508 case TIOCMIWAIT:
2509 dbg("%s (%d) TIOCMIWAIT", __FUNCTION__, port->number);
2510 cprev = mos7840_port->icount;
2511 while (1) {
2512 //interruptible_sleep_on(&mos7840_port->delta_msr_wait);
2513 mos7840_port->delta_msr_cond = 0;
2514 wait_event_interruptible(mos7840_port->delta_msr_wait,
2515 (mos7840_port->
2516 delta_msr_cond == 1));
2517
2518 /* see if a signal did it */
2519 if (signal_pending(current))
2520 return -ERESTARTSYS;
2521 cnow = mos7840_port->icount;
2522 if (cnow.rng == cprev.rng && cnow.dsr == cprev.dsr &&
2523 cnow.dcd == cprev.dcd && cnow.cts == cprev.cts)
2524 return -EIO; /* no change => error */
2525 if (((arg & TIOCM_RNG) && (cnow.rng != cprev.rng)) ||
2526 ((arg & TIOCM_DSR) && (cnow.dsr != cprev.dsr)) ||
2527 ((arg & TIOCM_CD) && (cnow.dcd != cprev.dcd)) ||
2528 ((arg & TIOCM_CTS) && (cnow.cts != cprev.cts))) {
2529 return 0;
2530 }
2531 cprev = cnow;
2532 }
2533 /* NOTREACHED */
2534 break;
2535
2536 case TIOCGICOUNT:
2537 cnow = mos7840_port->icount;
2538 icount.cts = cnow.cts;
2539 icount.dsr = cnow.dsr;
2540 icount.rng = cnow.rng;
2541 icount.dcd = cnow.dcd;
2542 icount.rx = cnow.rx;
2543 icount.tx = cnow.tx;
2544 icount.frame = cnow.frame;
2545 icount.overrun = cnow.overrun;
2546 icount.parity = cnow.parity;
2547 icount.brk = cnow.brk;
2548 icount.buf_overrun = cnow.buf_overrun;
2549
2550 dbg("%s (%d) TIOCGICOUNT RX=%d, TX=%d", __FUNCTION__,
2551 port->number, icount.rx, icount.tx);
2552 if (copy_to_user((void *)arg, &icount, sizeof(icount)))
2553 return -EFAULT;
2554 return 0;
2555
2556 case TIOCEXBAUD:
2557 return 0;
2558 default:
2559 break;
2560 }
2561
2562 return -ENOIOCTLCMD;
2563 }
2564
2565 static int mos7840_calc_num_ports(struct usb_serial *serial)
2566 {
2567
2568 dbg("numberofendpoints: %d \n",
2569 (int)serial->interface->cur_altsetting->desc.bNumEndpoints);
2570 dbg("numberofendpoints: %d \n",
2571 (int)serial->interface->altsetting->desc.bNumEndpoints);
2572 if (serial->interface->cur_altsetting->desc.bNumEndpoints == 5) {
2573 mos7840_num_ports = 2;
2574 serial->type->num_ports = 2;
2575 } else if (serial->interface->cur_altsetting->desc.bNumEndpoints == 9) {
2576 mos7840_num_ports = 4;
2577 serial->type->num_bulk_in = 4;
2578 serial->type->num_bulk_out = 4;
2579 serial->type->num_ports = 4;
2580 }
2581
2582 return mos7840_num_ports;
2583 }
2584
2585 /****************************************************************************
2586 * mos7840_startup
2587 ****************************************************************************/
2588
2589 static int mos7840_startup(struct usb_serial *serial)
2590 {
2591 struct moschip_port *mos7840_port;
2592 struct usb_device *dev;
2593 int i, status;
2594
2595 __u16 Data;
2596 dbg("%s \n", " mos7840_startup :entering..........");
2597
2598 if (!serial) {
2599 dbg("%s\n", "Invalid Handler");
2600 return -1;
2601 }
2602
2603 dev = serial->dev;
2604
2605 dbg("%s\n", "Entering...");
2606
2607 /* we set up the pointers to the endpoints in the mos7840_open *
2608 * function, as the structures aren't created yet. */
2609
2610 /* set up port private structures */
2611 for (i = 0; i < serial->num_ports; ++i) {
2612 mos7840_port = kmalloc(sizeof(struct moschip_port), GFP_KERNEL);
2613 if (mos7840_port == NULL) {
2614 err("%s - Out of memory", __FUNCTION__);
2615 return -ENOMEM;
2616 }
2617 memset(mos7840_port, 0, sizeof(struct moschip_port));
2618
2619 /* Initialize all port interrupt end point to port 0 int endpoint *
2620 * Our device has only one interrupt end point comman to all port */
2621
2622 mos7840_port->port = serial->port[i];
2623 mos7840_set_port_private(serial->port[i], mos7840_port);
2624
2625 mos7840_port->port_num = ((serial->port[i]->number -
2626 (serial->port[i]->serial->minor)) +
2627 1);
2628
2629 if (mos7840_port->port_num == 1) {
2630 mos7840_port->SpRegOffset = 0x0;
2631 mos7840_port->ControlRegOffset = 0x1;
2632 mos7840_port->DcrRegOffset = 0x4;
2633 } else if ((mos7840_port->port_num == 2)
2634 && (mos7840_num_ports == 4)) {
2635 mos7840_port->SpRegOffset = 0x8;
2636 mos7840_port->ControlRegOffset = 0x9;
2637 mos7840_port->DcrRegOffset = 0x16;
2638 } else if ((mos7840_port->port_num == 2)
2639 && (mos7840_num_ports == 2)) {
2640 mos7840_port->SpRegOffset = 0xa;
2641 mos7840_port->ControlRegOffset = 0xb;
2642 mos7840_port->DcrRegOffset = 0x19;
2643 } else if ((mos7840_port->port_num == 3)
2644 && (mos7840_num_ports == 4)) {
2645 mos7840_port->SpRegOffset = 0xa;
2646 mos7840_port->ControlRegOffset = 0xb;
2647 mos7840_port->DcrRegOffset = 0x19;
2648 } else if ((mos7840_port->port_num == 4)
2649 && (mos7840_num_ports == 4)) {
2650 mos7840_port->SpRegOffset = 0xc;
2651 mos7840_port->ControlRegOffset = 0xd;
2652 mos7840_port->DcrRegOffset = 0x1c;
2653 }
2654 mos7840_dump_serial_port(mos7840_port);
2655
2656 mos7840_set_port_private(serial->port[i], mos7840_port);
2657
2658 //enable rx_disable bit in control register
2659
2660 status =
2661 mos7840_get_reg_sync(serial->port[i],
2662 mos7840_port->ControlRegOffset, &Data);
2663 if (status < 0) {
2664 dbg("Reading ControlReg failed status-0x%x\n", status);
2665 break;
2666 } else
2667 dbg("ControlReg Reading success val is %x, status%d\n",
2668 Data, status);
2669 Data |= 0x08; //setting driver done bit
2670 Data |= 0x04; //sp1_bit to have cts change reflect in modem status reg
2671
2672 //Data |= 0x20; //rx_disable bit
2673 status = 0;
2674 status =
2675 mos7840_set_reg_sync(serial->port[i],
2676 mos7840_port->ControlRegOffset, Data);
2677 if (status < 0) {
2678 dbg("Writing ControlReg failed(rx_disable) status-0x%x\n", status);
2679 break;
2680 } else
2681 dbg("ControlReg Writing success(rx_disable) status%d\n",
2682 status);
2683
2684 //Write default values in DCR (i.e 0x01 in DCR0, 0x05 in DCR2 and 0x24 in DCR3
2685 Data = 0x01;
2686 status = 0;
2687 status =
2688 mos7840_set_reg_sync(serial->port[i],
2689 (__u16) (mos7840_port->DcrRegOffset +
2690 0), Data);
2691 if (status < 0) {
2692 dbg("Writing DCR0 failed status-0x%x\n", status);
2693 break;
2694 } else
2695 dbg("DCR0 Writing success status%d\n", status);
2696
2697 Data = 0x05;
2698 status = 0;
2699 status =
2700 mos7840_set_reg_sync(serial->port[i],
2701 (__u16) (mos7840_port->DcrRegOffset +
2702 1), Data);
2703 if (status < 0) {
2704 dbg("Writing DCR1 failed status-0x%x\n", status);
2705 break;
2706 } else
2707 dbg("DCR1 Writing success status%d\n", status);
2708
2709 Data = 0x24;
2710 status = 0;
2711 status =
2712 mos7840_set_reg_sync(serial->port[i],
2713 (__u16) (mos7840_port->DcrRegOffset +
2714 2), Data);
2715 if (status < 0) {
2716 dbg("Writing DCR2 failed status-0x%x\n", status);
2717 break;
2718 } else
2719 dbg("DCR2 Writing success status%d\n", status);
2720
2721 // write values in clkstart0x0 and clkmulti 0x20
2722 Data = 0x0;
2723 status = 0;
2724 status =
2725 mos7840_set_reg_sync(serial->port[i],
2726 CLK_START_VALUE_REGISTER, Data);
2727 if (status < 0) {
2728 dbg("Writing CLK_START_VALUE_REGISTER failed status-0x%x\n", status);
2729 break;
2730 } else
2731 dbg("CLK_START_VALUE_REGISTER Writing success status%d\n", status);
2732
2733 Data = 0x20;
2734 status = 0;
2735 status =
2736 mos7840_set_reg_sync(serial->port[i], CLK_MULTI_REGISTER,
2737 Data);
2738 if (status < 0) {
2739 dbg("Writing CLK_MULTI_REGISTER failed status-0x%x\n",
2740 status);
2741 break;
2742 } else
2743 dbg("CLK_MULTI_REGISTER Writing success status%d\n",
2744 status);
2745
2746 //write value 0x0 to scratchpad register
2747 Data = 0x00;
2748 status = 0;
2749 status =
2750 mos7840_set_uart_reg(serial->port[i], SCRATCH_PAD_REGISTER,
2751 Data);
2752 if (status < 0) {
2753 dbg("Writing SCRATCH_PAD_REGISTER failed status-0x%x\n",
2754 status);
2755 break;
2756 } else
2757 dbg("SCRATCH_PAD_REGISTER Writing success status%d\n",
2758 status);
2759
2760 //Zero Length flag register
2761 if ((mos7840_port->port_num != 1)
2762 && (mos7840_num_ports == 2)) {
2763
2764 Data = 0xff;
2765 status = 0;
2766 status = mos7840_set_reg_sync(serial->port[i],
2767 (__u16) (ZLP_REG1 +
2768 ((__u16)
2769 mos7840_port->
2770 port_num)),
2771 Data);
2772 dbg("ZLIP offset%x\n",
2773 (__u16) (ZLP_REG1 +
2774 ((__u16) mos7840_port->port_num)));
2775 if (status < 0) {
2776 dbg("Writing ZLP_REG%d failed status-0x%x\n",
2777 i + 2, status);
2778 break;
2779 } else
2780 dbg("ZLP_REG%d Writing success status%d\n",
2781 i + 2, status);
2782 } else {
2783 Data = 0xff;
2784 status = 0;
2785 status = mos7840_set_reg_sync(serial->port[i],
2786 (__u16) (ZLP_REG1 +
2787 ((__u16)
2788 mos7840_port->
2789 port_num) -
2790 0x1), Data);
2791 dbg("ZLIP offset%x\n",
2792 (__u16) (ZLP_REG1 +
2793 ((__u16) mos7840_port->port_num) - 0x1));
2794 if (status < 0) {
2795 dbg("Writing ZLP_REG%d failed status-0x%x\n",
2796 i + 1, status);
2797 break;
2798 } else
2799 dbg("ZLP_REG%d Writing success status%d\n",
2800 i + 1, status);
2801
2802 }
2803 mos7840_port->control_urb = usb_alloc_urb(0, SLAB_ATOMIC);
2804 mos7840_port->ctrl_buf = kmalloc(16, GFP_KERNEL);
2805
2806 }
2807
2808 //Zero Length flag enable
2809 Data = 0x0f;
2810 status = 0;
2811 status = mos7840_set_reg_sync(serial->port[0], ZLP_REG5, Data);
2812 if (status < 0) {
2813 dbg("Writing ZLP_REG5 failed status-0x%x\n", status);
2814 return -1;
2815 } else
2816 dbg("ZLP_REG5 Writing success status%d\n", status);
2817
2818 /* setting configuration feature to one */
2819 usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0),
2820 (__u8) 0x03, 0x00, 0x01, 0x00, 0x00, 0x00, 5 * HZ);
2821 return 0;
2822 }
2823
2824 /****************************************************************************
2825 * mos7840_shutdown
2826 * This function is called whenever the device is removed from the usb bus.
2827 ****************************************************************************/
2828
2829 static void mos7840_shutdown(struct usb_serial *serial)
2830 {
2831 int i;
2832 struct moschip_port *mos7840_port;
2833 dbg("%s \n", " shutdown :entering..........");
2834
2835 if (!serial) {
2836 dbg("%s", "Invalid Handler \n");
2837 return;
2838 }
2839
2840 /* check for the ports to be closed,close the ports and disconnect */
2841
2842 /* free private structure allocated for serial port *
2843 * stop reads and writes on all ports */
2844
2845 for (i = 0; i < serial->num_ports; ++i) {
2846 mos7840_port = mos7840_get_port_private(serial->port[i]);
2847 kfree(mos7840_port->ctrl_buf);
2848 usb_kill_urb(mos7840_port->control_urb);
2849 kfree(mos7840_port);
2850 mos7840_set_port_private(serial->port[i], NULL);
2851 }
2852
2853 dbg("%s\n", "Thank u :: ");
2854
2855 }
2856
2857 static struct usb_serial_driver moschip7840_4port_device = {
2858 .driver = {
2859 .owner = THIS_MODULE,
2860 .name = "mos7840",
2861 },
2862 .description = DRIVER_DESC,
2863 .id_table = moschip_port_id_table,
2864 .num_interrupt_in = 1, //NUM_DONT_CARE,//1,
2865 #ifdef check
2866 .num_bulk_in = 4,
2867 .num_bulk_out = 4,
2868 .num_ports = 4,
2869 #endif
2870 .open = mos7840_open,
2871 .close = mos7840_close,
2872 .write = mos7840_write,
2873 .write_room = mos7840_write_room,
2874 .chars_in_buffer = mos7840_chars_in_buffer,
2875 .throttle = mos7840_throttle,
2876 .unthrottle = mos7840_unthrottle,
2877 .calc_num_ports = mos7840_calc_num_ports,
2878 #ifdef MCSSerialProbe
2879 .probe = mos7840_serial_probe,
2880 #endif
2881 .ioctl = mos7840_ioctl,
2882 .set_termios = mos7840_set_termios,
2883 .break_ctl = mos7840_break,
2884 .tiocmget = mos7840_tiocmget,
2885 .tiocmset = mos7840_tiocmset,
2886 .attach = mos7840_startup,
2887 .shutdown = mos7840_shutdown,
2888 .read_bulk_callback = mos7840_bulk_in_callback,
2889 .read_int_callback = mos7840_interrupt_callback,
2890 };
2891
2892 static struct usb_driver io_driver = {
2893 .name = "mos7840",
2894 .probe = usb_serial_probe,
2895 .disconnect = usb_serial_disconnect,
2896 .id_table = moschip_id_table_combined,
2897 };
2898
2899 /****************************************************************************
2900 * moschip7840_init
2901 * This is called by the module subsystem, or on startup to initialize us
2902 ****************************************************************************/
2903 static int __init moschip7840_init(void)
2904 {
2905 int retval;
2906
2907 dbg("%s \n", " mos7840_init :entering..........");
2908
2909 /* Register with the usb serial */
2910 retval = usb_serial_register(&moschip7840_4port_device);
2911
2912 if (retval)
2913 goto failed_port_device_register;
2914
2915 dbg("%s\n", "Entring...");
2916 info(DRIVER_DESC " " DRIVER_VERSION);
2917
2918 /* Register with the usb */
2919 retval = usb_register(&io_driver);
2920
2921 if (retval)
2922 goto failed_usb_register;
2923
2924 if (retval == 0) {
2925 dbg("%s\n", "Leaving...");
2926 return 0;
2927 }
2928
2929 failed_usb_register:
2930 usb_serial_deregister(&moschip7840_4port_device);
2931
2932 failed_port_device_register:
2933
2934 return retval;
2935 }
2936
2937 /****************************************************************************
2938 * moschip7840_exit
2939 * Called when the driver is about to be unloaded.
2940 ****************************************************************************/
2941 static void __exit moschip7840_exit(void)
2942 {
2943
2944 dbg("%s \n", " mos7840_exit :entering..........");
2945
2946 usb_deregister(&io_driver);
2947
2948 usb_serial_deregister(&moschip7840_4port_device);
2949
2950 dbg("%s\n", "Entring...");
2951 }
2952
2953 module_init(moschip7840_init);
2954 module_exit(moschip7840_exit);
2955
2956 /* Module information */
2957 MODULE_DESCRIPTION(DRIVER_DESC);
2958 MODULE_LICENSE("GPL");
2959
2960 module_param(debug, bool, S_IRUGO | S_IWUSR);
2961 MODULE_PARM_DESC(debug, "Debug enabled or not");
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