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USB: mos7720, mos7840: remove redundant urb check
[pv_ops_mirror.git] / drivers / usb / serial / mos7840.c
blobf76480f1455dfddcf8fb53b5fa851b262bbac247
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 struct urb *int_urb;
180 __u8 shadowLCR; /* last LCR value received */
181 __u8 shadowMCR; /* last MCR value received */
182 char open;
183 char open_ports;
184 char zombie;
185 wait_queue_head_t wait_chase; /* for handling sleeping while waiting for chase to finish */
186 wait_queue_head_t delta_msr_wait; /* for handling sleeping while waiting for msr change to happen */
187 int delta_msr_cond;
188 struct async_icount icount;
189 struct usb_serial_port *port; /* loop back to the owner of this object */
190
191 /*Offsets */
192 __u8 SpRegOffset;
193 __u8 ControlRegOffset;
194 __u8 DcrRegOffset;
195 //for processing control URBS in interrupt context
196 struct urb *control_urb;
197 struct usb_ctrlrequest *dr;
198 char *ctrl_buf;
199 int MsrLsr;
200
201 spinlock_t pool_lock;
202 struct urb *write_urb_pool[NUM_URBS];
203 char busy[NUM_URBS];
204 };
205
206
207 static int debug;
208
209 /*
210 * mos7840_set_reg_sync
211 * To set the Control register by calling usb_fill_control_urb function
212 * by passing usb_sndctrlpipe function as parameter.
213 */
214
215 static int mos7840_set_reg_sync(struct usb_serial_port *port, __u16 reg,
216 __u16 val)
217 {
218 struct usb_device *dev = port->serial->dev;
219 val = val & 0x00ff;
220 dbg("mos7840_set_reg_sync offset is %x, value %x\n", reg, val);
221
222 return usb_control_msg(dev, usb_sndctrlpipe(dev, 0), MCS_WRREQ,
223 MCS_WR_RTYPE, val, reg, NULL, 0,
224 MOS_WDR_TIMEOUT);
225 }
226
227 /*
228 * mos7840_get_reg_sync
229 * To set the Uart register by calling usb_fill_control_urb function by
230 * passing usb_rcvctrlpipe function as parameter.
231 */
232
233 static int mos7840_get_reg_sync(struct usb_serial_port *port, __u16 reg,
234 __u16 * val)
235 {
236 struct usb_device *dev = port->serial->dev;
237 int ret = 0;
238
239 ret = usb_control_msg(dev, usb_rcvctrlpipe(dev, 0), MCS_RDREQ,
240 MCS_RD_RTYPE, 0, reg, val, VENDOR_READ_LENGTH,
241 MOS_WDR_TIMEOUT);
242 dbg("mos7840_get_reg_sync offset is %x, return val %x\n", reg, *val);
243 *val = (*val) & 0x00ff;
244 return ret;
245 }
246
247 /*
248 * mos7840_set_uart_reg
249 * To set the Uart register by calling usb_fill_control_urb function by
250 * passing usb_sndctrlpipe function as parameter.
251 */
252
253 static int mos7840_set_uart_reg(struct usb_serial_port *port, __u16 reg,
254 __u16 val)
255 {
256
257 struct usb_device *dev = port->serial->dev;
258 val = val & 0x00ff;
259 // For the UART control registers, the application number need to be Or'ed
260 if (port->serial->num_ports == 4) {
261 val |=
262 (((__u16) port->number - (__u16) (port->serial->minor)) +
263 1) << 8;
264 dbg("mos7840_set_uart_reg application number is %x\n", val);
265 } else {
266 if (((__u16) port->number - (__u16) (port->serial->minor)) == 0) {
267 val |=
268 (((__u16) port->number -
269 (__u16) (port->serial->minor)) + 1) << 8;
270 dbg("mos7840_set_uart_reg application number is %x\n",
271 val);
272 } else {
273 val |=
274 (((__u16) port->number -
275 (__u16) (port->serial->minor)) + 2) << 8;
276 dbg("mos7840_set_uart_reg application number is %x\n",
277 val);
278 }
279 }
280 return usb_control_msg(dev, usb_sndctrlpipe(dev, 0), MCS_WRREQ,
281 MCS_WR_RTYPE, val, reg, NULL, 0,
282 MOS_WDR_TIMEOUT);
283
284 }
285
286 /*
287 * mos7840_get_uart_reg
288 * To set the Control register by calling usb_fill_control_urb function
289 * by passing usb_rcvctrlpipe function as parameter.
290 */
291 static int mos7840_get_uart_reg(struct usb_serial_port *port, __u16 reg,
292 __u16 * val)
293 {
294 struct usb_device *dev = port->serial->dev;
295 int ret = 0;
296 __u16 Wval;
297
298 //dbg("application number is %4x \n",(((__u16)port->number - (__u16)(port->serial->minor))+1)<<8);
299 /*Wval is same as application number */
300 if (port->serial->num_ports == 4) {
301 Wval =
302 (((__u16) port->number - (__u16) (port->serial->minor)) +
303 1) << 8;
304 dbg("mos7840_get_uart_reg application number is %x\n", Wval);
305 } else {
306 if (((__u16) port->number - (__u16) (port->serial->minor)) == 0) {
307 Wval =
308 (((__u16) port->number -
309 (__u16) (port->serial->minor)) + 1) << 8;
310 dbg("mos7840_get_uart_reg application number is %x\n",
311 Wval);
312 } else {
313 Wval =
314 (((__u16) port->number -
315 (__u16) (port->serial->minor)) + 2) << 8;
316 dbg("mos7840_get_uart_reg application number is %x\n",
317 Wval);
318 }
319 }
320 ret = usb_control_msg(dev, usb_rcvctrlpipe(dev, 0), MCS_RDREQ,
321 MCS_RD_RTYPE, Wval, reg, val, VENDOR_READ_LENGTH,
322 MOS_WDR_TIMEOUT);
323 *val = (*val) & 0x00ff;
324 return ret;
325 }
326
327 static void mos7840_dump_serial_port(struct moschip_port *mos7840_port)
328 {
329
330 dbg("***************************************\n");
331 dbg("SpRegOffset is %2x\n", mos7840_port->SpRegOffset);
332 dbg("ControlRegOffset is %2x \n", mos7840_port->ControlRegOffset);
333 dbg("DCRRegOffset is %2x \n", mos7840_port->DcrRegOffset);
334 dbg("***************************************\n");
335
336 }
337
338 /************************************************************************/
339 /************************************************************************/
340 /* I N T E R F A C E F U N C T I O N S */
341 /* I N T E R F A C E F U N C T I O N S */
342 /************************************************************************/
343 /************************************************************************/
344
345 static inline void mos7840_set_port_private(struct usb_serial_port *port,
346 struct moschip_port *data)
347 {
348 usb_set_serial_port_data(port, (void *)data);
349 }
350
351 static inline struct moschip_port *mos7840_get_port_private(struct
352 usb_serial_port
353 *port)
354 {
355 return (struct moschip_port *)usb_get_serial_port_data(port);
356 }
357
358 static void mos7840_handle_new_msr(struct moschip_port *port, __u8 new_msr)
359 {
360 struct moschip_port *mos7840_port;
361 struct async_icount *icount;
362 mos7840_port = port;
363 icount = &mos7840_port->icount;
364 if (new_msr &
365 (MOS_MSR_DELTA_CTS | MOS_MSR_DELTA_DSR | MOS_MSR_DELTA_RI |
366 MOS_MSR_DELTA_CD)) {
367 icount = &mos7840_port->icount;
368
369 /* update input line counters */
370 if (new_msr & MOS_MSR_DELTA_CTS) {
371 icount->cts++;
372 smp_wmb();
373 }
374 if (new_msr & MOS_MSR_DELTA_DSR) {
375 icount->dsr++;
376 smp_wmb();
377 }
378 if (new_msr & MOS_MSR_DELTA_CD) {
379 icount->dcd++;
380 smp_wmb();
381 }
382 if (new_msr & MOS_MSR_DELTA_RI) {
383 icount->rng++;
384 smp_wmb();
385 }
386 }
387 }
388
389 static void mos7840_handle_new_lsr(struct moschip_port *port, __u8 new_lsr)
390 {
391 struct async_icount *icount;
392
393 dbg("%s - %02x", __FUNCTION__, new_lsr);
394
395 if (new_lsr & SERIAL_LSR_BI) {
396 //
397 // Parity and Framing errors only count if they
398 // occur exclusive of a break being
399 // received.
400 //
401 new_lsr &= (__u8) (SERIAL_LSR_OE | SERIAL_LSR_BI);
402 }
403
404 /* update input line counters */
405 icount = &port->icount;
406 if (new_lsr & SERIAL_LSR_BI) {
407 icount->brk++;
408 smp_wmb();
409 }
410 if (new_lsr & SERIAL_LSR_OE) {
411 icount->overrun++;
412 smp_wmb();
413 }
414 if (new_lsr & SERIAL_LSR_PE) {
415 icount->parity++;
416 smp_wmb();
417 }
418 if (new_lsr & SERIAL_LSR_FE) {
419 icount->frame++;
420 smp_wmb();
421 }
422 }
423
424 /************************************************************************/
425 /************************************************************************/
426 /* U S B C A L L B A C K F U N C T I O N S */
427 /* U S B C A L L B A C K F U N C T I O N S */
428 /************************************************************************/
429 /************************************************************************/
430
431 static void mos7840_control_callback(struct urb *urb)
432 {
433 unsigned char *data;
434 struct moschip_port *mos7840_port;
435 __u8 regval = 0x0;
436 int result = 0;
437 int status = urb->status;
438
439 mos7840_port = (struct moschip_port *)urb->context;
440
441 switch (status) {
442 case 0:
443 /* success */
444 break;
445 case -ECONNRESET:
446 case -ENOENT:
447 case -ESHUTDOWN:
448 /* this urb is terminated, clean up */
449 dbg("%s - urb shutting down with status: %d", __FUNCTION__,
450 status);
451 return;
452 default:
453 dbg("%s - nonzero urb status received: %d", __FUNCTION__,
454 status);
455 goto exit;
456 }
457
458 dbg("%s urb buffer size is %d\n", __FUNCTION__, urb->actual_length);
459 dbg("%s mos7840_port->MsrLsr is %d port %d\n", __FUNCTION__,
460 mos7840_port->MsrLsr, mos7840_port->port_num);
461 data = urb->transfer_buffer;
462 regval = (__u8) data[0];
463 dbg("%s data is %x\n", __FUNCTION__, regval);
464 if (mos7840_port->MsrLsr == 0)
465 mos7840_handle_new_msr(mos7840_port, regval);
466 else if (mos7840_port->MsrLsr == 1)
467 mos7840_handle_new_lsr(mos7840_port, regval);
468
469 exit:
470 spin_lock(&mos7840_port->pool_lock);
471 if (!mos7840_port->zombie)
472 result = usb_submit_urb(mos7840_port->int_urb, GFP_ATOMIC);
473 spin_unlock(&mos7840_port->pool_lock);
474 if (result) {
475 dev_err(&urb->dev->dev,
476 "%s - Error %d submitting interrupt urb\n",
477 __FUNCTION__, result);
478 }
479 }
480
481 static int mos7840_get_reg(struct moschip_port *mcs, __u16 Wval, __u16 reg,
482 __u16 * val)
483 {
484 struct usb_device *dev = mcs->port->serial->dev;
485 struct usb_ctrlrequest *dr = mcs->dr;
486 unsigned char *buffer = mcs->ctrl_buf;
487 int ret;
488
489 dr->bRequestType = MCS_RD_RTYPE;
490 dr->bRequest = MCS_RDREQ;
491 dr->wValue = cpu_to_le16(Wval); //0;
492 dr->wIndex = cpu_to_le16(reg);
493 dr->wLength = cpu_to_le16(2);
494
495 usb_fill_control_urb(mcs->control_urb, dev, usb_rcvctrlpipe(dev, 0),
496 (unsigned char *)dr, buffer, 2,
497 mos7840_control_callback, mcs);
498 mcs->control_urb->transfer_buffer_length = 2;
499 ret = usb_submit_urb(mcs->control_urb, GFP_ATOMIC);
500 return ret;
501 }
502
503 /*****************************************************************************
504 * mos7840_interrupt_callback
505 * this is the callback function for when we have received data on the
506 * interrupt endpoint.
507 *****************************************************************************/
508
509 static void mos7840_interrupt_callback(struct urb *urb)
510 {
511 int result;
512 int length;
513 struct moschip_port *mos7840_port;
514 struct usb_serial *serial;
515 __u16 Data;
516 unsigned char *data;
517 __u8 sp[5], st;
518 int i, rv = 0;
519 __u16 wval, wreg = 0;
520 int status = urb->status;
521
522 dbg("%s", " : Entering\n");
523
524 switch (status) {
525 case 0:
526 /* success */
527 break;
528 case -ECONNRESET:
529 case -ENOENT:
530 case -ESHUTDOWN:
531 /* this urb is terminated, clean up */
532 dbg("%s - urb shutting down with status: %d", __FUNCTION__,
533 status);
534 return;
535 default:
536 dbg("%s - nonzero urb status received: %d", __FUNCTION__,
537 status);
538 goto exit;
539 }
540
541 length = urb->actual_length;
542 data = urb->transfer_buffer;
543
544 serial = (struct usb_serial *)urb->context;
545
546 /* Moschip get 5 bytes
547 * Byte 1 IIR Port 1 (port.number is 0)
548 * Byte 2 IIR Port 2 (port.number is 1)
549 * Byte 3 IIR Port 3 (port.number is 2)
550 * Byte 4 IIR Port 4 (port.number is 3)
551 * Byte 5 FIFO status for both */
552
553 if (length && length > 5) {
554 dbg("%s \n", "Wrong data !!!");
555 return;
556 }
557
558 sp[0] = (__u8) data[0];
559 sp[1] = (__u8) data[1];
560 sp[2] = (__u8) data[2];
561 sp[3] = (__u8) data[3];
562 st = (__u8) data[4];
563
564 for (i = 0; i < serial->num_ports; i++) {
565 mos7840_port = mos7840_get_port_private(serial->port[i]);
566 wval =
567 (((__u16) serial->port[i]->number -
568 (__u16) (serial->minor)) + 1) << 8;
569 if (mos7840_port->open) {
570 if (sp[i] & 0x01) {
571 dbg("SP%d No Interrupt !!!\n", i);
572 } else {
573 switch (sp[i] & 0x0f) {
574 case SERIAL_IIR_RLS:
575 dbg("Serial Port %d: Receiver status error or ", i);
576 dbg("address bit detected in 9-bit mode\n");
577 mos7840_port->MsrLsr = 1;
578 wreg = LINE_STATUS_REGISTER;
579 break;
580 case SERIAL_IIR_MS:
581 dbg("Serial Port %d: Modem status change\n", i);
582 mos7840_port->MsrLsr = 0;
583 wreg = MODEM_STATUS_REGISTER;
584 break;
585 }
586 spin_lock(&mos7840_port->pool_lock);
587 if (!mos7840_port->zombie) {
588 rv = mos7840_get_reg(mos7840_port, wval, wreg, &Data);
589 } else {
590 spin_unlock(&mos7840_port->pool_lock);
591 return;
592 }
593 spin_unlock(&mos7840_port->pool_lock);
594 }
595 }
596 }
597 if (!(rv < 0)) /* the completion handler for the control urb will resubmit */
598 return;
599 exit:
600 result = usb_submit_urb(urb, GFP_ATOMIC);
601 if (result) {
602 dev_err(&urb->dev->dev,
603 "%s - Error %d submitting interrupt urb\n",
604 __FUNCTION__, result);
605 }
606 }
607
608 static int mos7840_port_paranoia_check(struct usb_serial_port *port,
609 const char *function)
610 {
611 if (!port) {
612 dbg("%s - port == NULL", function);
613 return -1;
614 }
615 if (!port->serial) {
616 dbg("%s - port->serial == NULL", function);
617 return -1;
618 }
619
620 return 0;
621 }
622
623 /* Inline functions to check the sanity of a pointer that is passed to us */
624 static int mos7840_serial_paranoia_check(struct usb_serial *serial,
625 const char *function)
626 {
627 if (!serial) {
628 dbg("%s - serial == NULL", function);
629 return -1;
630 }
631 if (!serial->type) {
632 dbg("%s - serial->type == NULL!", function);
633 return -1;
634 }
635
636 return 0;
637 }
638
639 static struct usb_serial *mos7840_get_usb_serial(struct usb_serial_port *port,
640 const char *function)
641 {
642 /* if no port was specified, or it fails a paranoia check */
643 if (!port ||
644 mos7840_port_paranoia_check(port, function) ||
645 mos7840_serial_paranoia_check(port->serial, function)) {
646 /* then say that we don't have a valid usb_serial thing, which will
647 * end up genrating -ENODEV return values */
648 return NULL;
649 }
650
651 return port->serial;
652 }
653
654 /*****************************************************************************
655 * mos7840_bulk_in_callback
656 * this is the callback function for when we have received data on the
657 * bulk in endpoint.
658 *****************************************************************************/
659
660 static void mos7840_bulk_in_callback(struct urb *urb)
661 {
662 int retval;
663 unsigned char *data;
664 struct usb_serial *serial;
665 struct usb_serial_port *port;
666 struct moschip_port *mos7840_port;
667 struct tty_struct *tty;
668 int status = urb->status;
669
670 if (status) {
671 dbg("nonzero read bulk status received: %d", status);
672 return;
673 }
674
675 mos7840_port = (struct moschip_port *)urb->context;
676 if (!mos7840_port) {
677 dbg("%s", "NULL mos7840_port pointer \n");
678 return;
679 }
680
681 port = (struct usb_serial_port *)mos7840_port->port;
682 if (mos7840_port_paranoia_check(port, __FUNCTION__)) {
683 dbg("%s", "Port Paranoia failed \n");
684 return;
685 }
686
687 serial = mos7840_get_usb_serial(port, __FUNCTION__);
688 if (!serial) {
689 dbg("%s\n", "Bad serial pointer ");
690 return;
691 }
692
693 dbg("%s\n", "Entering... \n");
694
695 data = urb->transfer_buffer;
696
697 dbg("%s", "Entering ........... \n");
698
699 if (urb->actual_length) {
700 tty = mos7840_port->port->tty;
701 if (tty) {
702 tty_buffer_request_room(tty, urb->actual_length);
703 tty_insert_flip_string(tty, data, urb->actual_length);
704 dbg(" %s \n", data);
705 tty_flip_buffer_push(tty);
706 }
707 mos7840_port->icount.rx += urb->actual_length;
708 smp_wmb();
709 dbg("mos7840_port->icount.rx is %d:\n",
710 mos7840_port->icount.rx);
711 }
712
713 if (!mos7840_port->read_urb) {
714 dbg("%s", "URB KILLED !!!\n");
715 return;
716 }
717
718
719 mos7840_port->read_urb->dev = serial->dev;
720
721 retval = usb_submit_urb(mos7840_port->read_urb, GFP_ATOMIC);
722
723 if (retval) {
724 dbg(" usb_submit_urb(read bulk) failed, retval = %d",
725 retval);
726 }
727 }
728
729 /*****************************************************************************
730 * mos7840_bulk_out_data_callback
731 * this is the callback function for when we have finished sending serial data
732 * on the bulk out endpoint.
733 *****************************************************************************/
734
735 static void mos7840_bulk_out_data_callback(struct urb *urb)
736 {
737 struct moschip_port *mos7840_port;
738 struct tty_struct *tty;
739 int status = urb->status;
740 int i;
741
742 mos7840_port = (struct moschip_port *)urb->context;
743 spin_lock(&mos7840_port->pool_lock);
744 for (i = 0; i < NUM_URBS; i++) {
745 if (urb == mos7840_port->write_urb_pool[i]) {
746 mos7840_port->busy[i] = 0;
747 break;
748 }
749 }
750 spin_unlock(&mos7840_port->pool_lock);
751
752 if (status) {
753 dbg("nonzero write bulk status received:%d\n", status);
754 return;
755 }
756
757 if (mos7840_port_paranoia_check(mos7840_port->port, __FUNCTION__)) {
758 dbg("%s", "Port Paranoia failed \n");
759 return;
760 }
761
762 dbg("%s \n", "Entering .........");
763
764 tty = mos7840_port->port->tty;
765
766 if (tty && mos7840_port->open)
767 tty_wakeup(tty);
768
769 }
770
771 /************************************************************************/
772 /* 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 */
773 /************************************************************************/
774 #ifdef MCSSerialProbe
775 static int mos7840_serial_probe(struct usb_serial *serial,
776 const struct usb_device_id *id)
777 {
778
779 /*need to implement the mode_reg reading and updating\
780 structures usb_serial_ device_type\
781 (i.e num_ports, num_bulkin,bulkout etc) */
782 /* Also we can update the changes attach */
783 return 1;
784 }
785 #endif
786
787 /*****************************************************************************
788 * mos7840_open
789 * this function is called by the tty driver when a port is opened
790 * If successful, we return 0
791 * Otherwise we return a negative error number.
792 *****************************************************************************/
793
794 static int mos7840_open(struct usb_serial_port *port, struct file *filp)
795 {
796 int response;
797 int j;
798 struct usb_serial *serial;
799 struct urb *urb;
800 __u16 Data;
801 int status;
802 struct moschip_port *mos7840_port;
803 struct moschip_port *port0;
804
805 if (mos7840_port_paranoia_check(port, __FUNCTION__)) {
806 dbg("%s", "Port Paranoia failed \n");
807 return -ENODEV;
808 }
809
810 serial = port->serial;
811
812 if (mos7840_serial_paranoia_check(serial, __FUNCTION__)) {
813 dbg("%s", "Serial Paranoia failed \n");
814 return -ENODEV;
815 }
816
817 mos7840_port = mos7840_get_port_private(port);
818 port0 = mos7840_get_port_private(serial->port[0]);
819
820 if (mos7840_port == NULL || port0 == NULL)
821 return -ENODEV;
822
823 usb_clear_halt(serial->dev, port->write_urb->pipe);
824 usb_clear_halt(serial->dev, port->read_urb->pipe);
825 port0->open_ports++;
826
827 /* Initialising the write urb pool */
828 for (j = 0; j < NUM_URBS; ++j) {
829 urb = usb_alloc_urb(0, GFP_KERNEL);
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 = kmalloc(URB_TRANSFER_BUFFER_SIZE, GFP_KERNEL);
838 if (!urb->transfer_buffer) {
839 usb_free_urb(urb);
840 mos7840_port->write_urb_pool[j] = NULL;
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 = mos7840_set_reg_sync(port, mos7840_port->ControlRegOffset, Data);
893 if (status < 0) {
894 dbg("writing Controlreg failed\n");
895 return -1;
896 }
897 //do register settings here
898 // Set all regs to the device default values.
899 ////////////////////////////////////
900 // First Disable all interrupts.
901 ////////////////////////////////////
902
903 Data = 0x00;
904 status = mos7840_set_uart_reg(port, INTERRUPT_ENABLE_REGISTER, Data);
905 if (status < 0) {
906 dbg("disableing interrupts failed\n");
907 return -1;
908 }
909 // Set FIFO_CONTROL_REGISTER to the default value
910 Data = 0x00;
911 status = mos7840_set_uart_reg(port, FIFO_CONTROL_REGISTER, Data);
912 if (status < 0) {
913 dbg("Writing FIFO_CONTROL_REGISTER failed\n");
914 return -1;
915 }
916
917 Data = 0xcf;
918 status = mos7840_set_uart_reg(port, FIFO_CONTROL_REGISTER, Data);
919 if (status < 0) {
920 dbg("Writing FIFO_CONTROL_REGISTER failed\n");
921 return -1;
922 }
923
924 Data = 0x03;
925 status = mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data);
926 mos7840_port->shadowLCR = Data;
927
928 Data = 0x0b;
929 status = mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER, Data);
930 mos7840_port->shadowMCR = Data;
931
932 Data = 0x00;
933 status = mos7840_get_uart_reg(port, LINE_CONTROL_REGISTER, &Data);
934 mos7840_port->shadowLCR = Data;
935
936 Data |= SERIAL_LCR_DLAB; //data latch enable in LCR 0x80
937 status = mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data);
938
939 Data = 0x0c;
940 status = 0;
941 status = mos7840_set_uart_reg(port, DIVISOR_LATCH_LSB, Data);
942
943 Data = 0x0;
944 status = 0;
945 status = mos7840_set_uart_reg(port, DIVISOR_LATCH_MSB, Data);
946
947 Data = 0x00;
948 status = 0;
949 status = mos7840_get_uart_reg(port, LINE_CONTROL_REGISTER, &Data);
950
951 Data = Data & ~SERIAL_LCR_DLAB;
952 status = 0;
953 status = mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data);
954 mos7840_port->shadowLCR = Data;
955
956 //clearing Bulkin and Bulkout Fifo
957 Data = 0x0;
958 status = 0;
959 status = mos7840_get_reg_sync(port, mos7840_port->SpRegOffset, &Data);
960
961 Data = Data | 0x0c;
962 status = 0;
963 status = mos7840_set_reg_sync(port, mos7840_port->SpRegOffset, Data);
964
965 Data = Data & ~0x0c;
966 status = 0;
967 status = mos7840_set_reg_sync(port, mos7840_port->SpRegOffset, Data);
968 //Finally enable all interrupts
969 Data = 0x0;
970 Data = 0x0c;
971 status = 0;
972 status = mos7840_set_uart_reg(port, INTERRUPT_ENABLE_REGISTER, Data);
973
974 //clearing rx_disable
975 Data = 0x0;
976 status = 0;
977 status =
978 mos7840_get_reg_sync(port, mos7840_port->ControlRegOffset, &Data);
979 Data = Data & ~0x20;
980 status = 0;
981 status =
982 mos7840_set_reg_sync(port, mos7840_port->ControlRegOffset, Data);
983
984 // rx_negate
985 Data = 0x0;
986 status = 0;
987 status =
988 mos7840_get_reg_sync(port, mos7840_port->ControlRegOffset, &Data);
989 Data = Data | 0x10;
990 status = 0;
991 status =
992 mos7840_set_reg_sync(port, mos7840_port->ControlRegOffset, Data);
993
994 /* force low_latency on so that our tty_push actually forces *
995 * the data through,otherwise it is scheduled, and with *
996 * high data rates (like with OHCI) data can get lost. */
997
998 if (port->tty)
999 port->tty->low_latency = 1;
1000 /* Check to see if we've set up our endpoint info yet *
1001 * (can't set it up in mos7840_startup as the structures *
1002 * were not set up at that time.) */
1003 if (port0->open_ports == 1) {
1004 if (serial->port[0]->interrupt_in_buffer == NULL) {
1005
1006 /* set up interrupt urb */
1007
1008 usb_fill_int_urb(serial->port[0]->interrupt_in_urb,
1009 serial->dev,
1010 usb_rcvintpipe(serial->dev,
1011 serial->port[0]->
1012 interrupt_in_endpointAddress),
1013 serial->port[0]->interrupt_in_buffer,
1014 serial->port[0]->interrupt_in_urb->
1015 transfer_buffer_length,
1016 mos7840_interrupt_callback,
1017 serial,
1018 serial->port[0]->interrupt_in_urb->
1019 interval);
1020
1021 /* start interrupt read for mos7840 *
1022 * will continue as long as mos7840 is connected */
1023
1024 response =
1025 usb_submit_urb(serial->port[0]->interrupt_in_urb,
1026 GFP_KERNEL);
1027 if (response) {
1028 err("%s - Error %d submitting interrupt urb",
1029 __FUNCTION__, response);
1030 }
1031
1032 }
1033
1034 }
1035
1036 /* see if we've set up our endpoint info yet *
1037 * (can't set it up in mos7840_startup as the *
1038 * structures were not set up at that time.) */
1039
1040 dbg("port number is %d \n", port->number);
1041 dbg("serial number is %d \n", port->serial->minor);
1042 dbg("Bulkin endpoint is %d \n", port->bulk_in_endpointAddress);
1043 dbg("BulkOut endpoint is %d \n", port->bulk_out_endpointAddress);
1044 dbg("Interrupt endpoint is %d \n", port->interrupt_in_endpointAddress);
1045 dbg("port's number in the device is %d\n", mos7840_port->port_num);
1046 mos7840_port->read_urb = port->read_urb;
1047
1048 /* set up our bulk in urb */
1049
1050 usb_fill_bulk_urb(mos7840_port->read_urb,
1051 serial->dev,
1052 usb_rcvbulkpipe(serial->dev,
1053 port->bulk_in_endpointAddress),
1054 port->bulk_in_buffer,
1055 mos7840_port->read_urb->transfer_buffer_length,
1056 mos7840_bulk_in_callback, mos7840_port);
1057
1058 dbg("mos7840_open: bulkin endpoint is %d\n",
1059 port->bulk_in_endpointAddress);
1060 response = usb_submit_urb(mos7840_port->read_urb, GFP_KERNEL);
1061 if (response) {
1062 err("%s - Error %d submitting control urb", __FUNCTION__,
1063 response);
1064 }
1065
1066 /* initialize our wait queues */
1067 init_waitqueue_head(&mos7840_port->wait_chase);
1068 init_waitqueue_head(&mos7840_port->delta_msr_wait);
1069
1070 /* initialize our icount structure */
1071 memset(&(mos7840_port->icount), 0x00, sizeof(mos7840_port->icount));
1072
1073 /* initialize our port settings */
1074 mos7840_port->shadowMCR = MCR_MASTER_IE; /* Must set to enable ints! */
1075 /* send a open port command */
1076 mos7840_port->open = 1;
1077 //mos7840_change_port_settings(mos7840_port,old_termios);
1078 mos7840_port->icount.tx = 0;
1079 mos7840_port->icount.rx = 0;
1080
1081 dbg("\n\nusb_serial serial:%p mos7840_port:%p\n usb_serial_port port:%p\n\n", serial, mos7840_port, port);
1082
1083 return 0;
1084
1085 }
1086
1087 /*****************************************************************************
1088 * mos7840_chars_in_buffer
1089 * this function is called by the tty driver when it wants to know how many
1090 * bytes of data we currently have outstanding in the port (data that has
1091 * been written, but hasn't made it out the port yet)
1092 * If successful, we return the number of bytes left to be written in the
1093 * system,
1094 * Otherwise we return a negative error number.
1095 *****************************************************************************/
1096
1097 static int mos7840_chars_in_buffer(struct usb_serial_port *port)
1098 {
1099 int i;
1100 int chars = 0;
1101 unsigned long flags;
1102 struct moschip_port *mos7840_port;
1103
1104 dbg("%s \n", " mos7840_chars_in_buffer:entering ...........");
1105
1106 if (mos7840_port_paranoia_check(port, __FUNCTION__)) {
1107 dbg("%s", "Invalid port \n");
1108 return -1;
1109 }
1110
1111 mos7840_port = mos7840_get_port_private(port);
1112 if (mos7840_port == NULL) {
1113 dbg("%s \n", "mos7840_break:leaving ...........");
1114 return -1;
1115 }
1116
1117 spin_lock_irqsave(&mos7840_port->pool_lock,flags);
1118 for (i = 0; i < NUM_URBS; ++i) {
1119 if (mos7840_port->busy[i]) {
1120 chars += URB_TRANSFER_BUFFER_SIZE;
1121 }
1122 }
1123 spin_unlock_irqrestore(&mos7840_port->pool_lock,flags);
1124 dbg("%s - returns %d", __FUNCTION__, chars);
1125 return chars;
1126
1127 }
1128
1129 /************************************************************************
1130 *
1131 * mos7840_block_until_tx_empty
1132 *
1133 * This function will block the close until one of the following:
1134 * 1. TX count are 0
1135 * 2. The mos7840 has stopped
1136 * 3. A timout of 3 seconds without activity has expired
1137 *
1138 ************************************************************************/
1139 static void mos7840_block_until_tx_empty(struct moschip_port *mos7840_port)
1140 {
1141 int timeout = HZ / 10;
1142 int wait = 30;
1143 int count;
1144
1145 while (1) {
1146
1147 count = mos7840_chars_in_buffer(mos7840_port->port);
1148
1149 /* Check for Buffer status */
1150 if (count <= 0) {
1151 return;
1152 }
1153
1154 /* Block the thread for a while */
1155 interruptible_sleep_on_timeout(&mos7840_port->wait_chase,
1156 timeout);
1157
1158 /* No activity.. count down section */
1159 wait--;
1160 if (wait == 0) {
1161 dbg("%s - TIMEOUT", __FUNCTION__);
1162 return;
1163 } else {
1164 /* Reset timout value back to seconds */
1165 wait = 30;
1166 }
1167 }
1168 }
1169
1170 /*****************************************************************************
1171 * mos7840_close
1172 * this function is called by the tty driver when a port is closed
1173 *****************************************************************************/
1174
1175 static void mos7840_close(struct usb_serial_port *port, struct file *filp)
1176 {
1177 struct usb_serial *serial;
1178 struct moschip_port *mos7840_port;
1179 struct moschip_port *port0;
1180 int j;
1181 __u16 Data;
1182
1183 dbg("%s\n", "mos7840_close:entering...");
1184
1185 if (mos7840_port_paranoia_check(port, __FUNCTION__)) {
1186 dbg("%s", "Port Paranoia failed \n");
1187 return;
1188 }
1189
1190 serial = mos7840_get_usb_serial(port, __FUNCTION__);
1191 if (!serial) {
1192 dbg("%s", "Serial Paranoia failed \n");
1193 return;
1194 }
1195
1196 mos7840_port = mos7840_get_port_private(port);
1197 port0 = mos7840_get_port_private(serial->port[0]);
1198
1199 if (mos7840_port == NULL || port0 == NULL)
1200 return;
1201
1202 for (j = 0; j < NUM_URBS; ++j)
1203 usb_kill_urb(mos7840_port->write_urb_pool[j]);
1204
1205 /* Freeing Write URBs */
1206 for (j = 0; j < NUM_URBS; ++j) {
1207 if (mos7840_port->write_urb_pool[j]) {
1208 if (mos7840_port->write_urb_pool[j]->transfer_buffer)
1209 kfree(mos7840_port->write_urb_pool[j]->
1210 transfer_buffer);
1211
1212 usb_free_urb(mos7840_port->write_urb_pool[j]);
1213 }
1214 }
1215
1216 if (serial->dev) {
1217 /* flush and block until tx is empty */
1218 mos7840_block_until_tx_empty(mos7840_port);
1219 }
1220
1221 /* While closing port, shutdown all bulk read, write *
1222 * and interrupt read if they exists */
1223 if (serial->dev) {
1224
1225 if (mos7840_port->write_urb) {
1226 dbg("%s", "Shutdown bulk write\n");
1227 usb_kill_urb(mos7840_port->write_urb);
1228 }
1229
1230 if (mos7840_port->read_urb) {
1231 dbg("%s", "Shutdown bulk read\n");
1232 usb_kill_urb(mos7840_port->read_urb);
1233 }
1234 if ((&mos7840_port->control_urb)) {
1235 dbg("%s", "Shutdown control read\n");
1236 // usb_kill_urb (mos7840_port->control_urb);
1237
1238 }
1239 }
1240 // if(mos7840_port->ctrl_buf != NULL)
1241 // kfree(mos7840_port->ctrl_buf);
1242 port0->open_ports--;
1243 dbg("mos7840_num_open_ports in close%d:in port%d\n",
1244 port0->open_ports, port->number);
1245 if (port0->open_ports == 0) {
1246 if (serial->port[0]->interrupt_in_urb) {
1247 dbg("%s", "Shutdown interrupt_in_urb\n");
1248 usb_kill_urb(serial->port[0]->interrupt_in_urb);
1249 }
1250 }
1251
1252 if (mos7840_port->write_urb) {
1253 /* if this urb had a transfer buffer already (old tx) free it */
1254
1255 if (mos7840_port->write_urb->transfer_buffer != NULL) {
1256 kfree(mos7840_port->write_urb->transfer_buffer);
1257 }
1258 usb_free_urb(mos7840_port->write_urb);
1259 }
1260
1261 Data = 0x0;
1262 mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER, Data);
1263
1264 Data = 0x00;
1265 mos7840_set_uart_reg(port, INTERRUPT_ENABLE_REGISTER, Data);
1266
1267 mos7840_port->open = 0;
1268
1269 dbg("%s \n", "Leaving ............");
1270 }
1271
1272 /************************************************************************
1273 *
1274 * mos7840_block_until_chase_response
1275 *
1276 * This function will block the close until one of the following:
1277 * 1. Response to our Chase comes from mos7840
1278 * 2. A timout of 10 seconds without activity has expired
1279 * (1K of mos7840 data @ 2400 baud ==> 4 sec to empty)
1280 *
1281 ************************************************************************/
1282
1283 static void mos7840_block_until_chase_response(struct moschip_port
1284 *mos7840_port)
1285 {
1286 int timeout = 1 * HZ;
1287 int wait = 10;
1288 int count;
1289
1290 while (1) {
1291 count = mos7840_chars_in_buffer(mos7840_port->port);
1292
1293 /* Check for Buffer status */
1294 if (count <= 0) {
1295 return;
1296 }
1297
1298 /* Block the thread for a while */
1299 interruptible_sleep_on_timeout(&mos7840_port->wait_chase,
1300 timeout);
1301 /* No activity.. count down section */
1302 wait--;
1303 if (wait == 0) {
1304 dbg("%s - TIMEOUT", __FUNCTION__);
1305 return;
1306 } else {
1307 /* Reset timout value back to seconds */
1308 wait = 10;
1309 }
1310 }
1311
1312 }
1313
1314 /*****************************************************************************
1315 * mos7840_break
1316 * this function sends a break to the port
1317 *****************************************************************************/
1318 static void mos7840_break(struct usb_serial_port *port, int break_state)
1319 {
1320 unsigned char data;
1321 struct usb_serial *serial;
1322 struct moschip_port *mos7840_port;
1323
1324 dbg("%s \n", "Entering ...........");
1325 dbg("mos7840_break: Start\n");
1326
1327 if (mos7840_port_paranoia_check(port, __FUNCTION__)) {
1328 dbg("%s", "Port Paranoia failed \n");
1329 return;
1330 }
1331
1332 serial = mos7840_get_usb_serial(port, __FUNCTION__);
1333 if (!serial) {
1334 dbg("%s", "Serial Paranoia failed \n");
1335 return;
1336 }
1337
1338 mos7840_port = mos7840_get_port_private(port);
1339
1340 if (mos7840_port == NULL) {
1341 return;
1342 }
1343
1344 if (serial->dev) {
1345
1346 /* flush and block until tx is empty */
1347 mos7840_block_until_chase_response(mos7840_port);
1348 }
1349
1350 if (break_state == -1) {
1351 data = mos7840_port->shadowLCR | LCR_SET_BREAK;
1352 } else {
1353 data = mos7840_port->shadowLCR & ~LCR_SET_BREAK;
1354 }
1355
1356 mos7840_port->shadowLCR = data;
1357 dbg("mcs7840_break mos7840_port->shadowLCR is %x\n",
1358 mos7840_port->shadowLCR);
1359 mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER,
1360 mos7840_port->shadowLCR);
1361
1362 return;
1363 }
1364
1365 /*****************************************************************************
1366 * mos7840_write_room
1367 * this function is called by the tty driver when it wants to know how many
1368 * bytes of data we can accept for a specific port.
1369 * If successful, we return the amount of room that we have for this port
1370 * Otherwise we return a negative error number.
1371 *****************************************************************************/
1372
1373 static int mos7840_write_room(struct usb_serial_port *port)
1374 {
1375 int i;
1376 int room = 0;
1377 unsigned long flags;
1378 struct moschip_port *mos7840_port;
1379
1380 dbg("%s \n", " mos7840_write_room:entering ...........");
1381
1382 if (mos7840_port_paranoia_check(port, __FUNCTION__)) {
1383 dbg("%s", "Invalid port \n");
1384 dbg("%s \n", " mos7840_write_room:leaving ...........");
1385 return -1;
1386 }
1387
1388 mos7840_port = mos7840_get_port_private(port);
1389 if (mos7840_port == NULL) {
1390 dbg("%s \n", "mos7840_break:leaving ...........");
1391 return -1;
1392 }
1393
1394 spin_lock_irqsave(&mos7840_port->pool_lock, flags);
1395 for (i = 0; i < NUM_URBS; ++i) {
1396 if (!mos7840_port->busy[i]) {
1397 room += URB_TRANSFER_BUFFER_SIZE;
1398 }
1399 }
1400 spin_unlock_irqrestore(&mos7840_port->pool_lock, flags);
1401
1402 room = (room == 0) ? 0 : room - URB_TRANSFER_BUFFER_SIZE + 1;
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 unsigned long flags;
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 spin_lock_irqsave(&mos7840_port->pool_lock, flags);
1491 for (i = 0; i < NUM_URBS; ++i) {
1492 if (!mos7840_port->busy[i]) {
1493 mos7840_port->busy[i] = 1;
1494 urb = mos7840_port->write_urb_pool[i];
1495 dbg("\nURB:%d", i);
1496 break;
1497 }
1498 }
1499 spin_unlock_irqrestore(&mos7840_port->pool_lock, flags);
1500
1501 if (urb == NULL) {
1502 dbg("%s - no more free urbs", __FUNCTION__);
1503 goto exit;
1504 }
1505
1506 if (urb->transfer_buffer == NULL) {
1507 urb->transfer_buffer =
1508 kmalloc(URB_TRANSFER_BUFFER_SIZE, GFP_KERNEL);
1509
1510 if (urb->transfer_buffer == NULL) {
1511 err("%s no more kernel memory...", __FUNCTION__);
1512 goto exit;
1513 }
1514 }
1515 transfer_size = min(count, URB_TRANSFER_BUFFER_SIZE);
1516
1517 memcpy(urb->transfer_buffer, current_position, transfer_size);
1518
1519 /* fill urb with data and submit */
1520 usb_fill_bulk_urb(urb,
1521 serial->dev,
1522 usb_sndbulkpipe(serial->dev,
1523 port->bulk_out_endpointAddress),
1524 urb->transfer_buffer,
1525 transfer_size,
1526 mos7840_bulk_out_data_callback, mos7840_port);
1527
1528 data1 = urb->transfer_buffer;
1529 dbg("\nbulkout endpoint is %d", port->bulk_out_endpointAddress);
1530
1531 /* send it down the pipe */
1532 status = usb_submit_urb(urb, GFP_ATOMIC);
1533
1534 if (status) {
1535 mos7840_port->busy[i] = 0;
1536 err("%s - usb_submit_urb(write bulk) failed with status = %d",
1537 __FUNCTION__, status);
1538 bytes_sent = status;
1539 goto exit;
1540 }
1541 bytes_sent = transfer_size;
1542 mos7840_port->icount.tx += transfer_size;
1543 smp_wmb();
1544 dbg("mos7840_port->icount.tx is %d:\n", mos7840_port->icount.tx);
1545 exit:
1546
1547 return bytes_sent;
1548
1549 }
1550
1551 /*****************************************************************************
1552 * mos7840_throttle
1553 * this function is called by the tty driver when it wants to stop the data
1554 * being read from the port.
1555 *****************************************************************************/
1556
1557 static void mos7840_throttle(struct usb_serial_port *port)
1558 {
1559 struct moschip_port *mos7840_port;
1560 struct tty_struct *tty;
1561 int status;
1562
1563 if (mos7840_port_paranoia_check(port, __FUNCTION__)) {
1564 dbg("%s", "Invalid port \n");
1565 return;
1566 }
1567
1568 dbg("- port %d\n", port->number);
1569
1570 mos7840_port = mos7840_get_port_private(port);
1571
1572 if (mos7840_port == NULL)
1573 return;
1574
1575 if (!mos7840_port->open) {
1576 dbg("%s\n", "port not opened");
1577 return;
1578 }
1579
1580 dbg("%s", "Entering .......... \n");
1581
1582 tty = port->tty;
1583 if (!tty) {
1584 dbg("%s - no tty available", __FUNCTION__);
1585 return;
1586 }
1587
1588 /* if we are implementing XON/XOFF, send the stop character */
1589 if (I_IXOFF(tty)) {
1590 unsigned char stop_char = STOP_CHAR(tty);
1591 status = mos7840_write(port, &stop_char, 1);
1592 if (status <= 0) {
1593 return;
1594 }
1595 }
1596
1597 /* if we are implementing RTS/CTS, toggle that line */
1598 if (tty->termios->c_cflag & CRTSCTS) {
1599 mos7840_port->shadowMCR &= ~MCR_RTS;
1600 status = 0;
1601 status =
1602 mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER,
1603 mos7840_port->shadowMCR);
1604
1605 if (status < 0) {
1606 return;
1607 }
1608 }
1609
1610 return;
1611 }
1612
1613 /*****************************************************************************
1614 * mos7840_unthrottle
1615 * this function is called by the tty driver when it wants to resume the data
1616 * being read from the port (called after SerialThrottle is called)
1617 *****************************************************************************/
1618 static void mos7840_unthrottle(struct usb_serial_port *port)
1619 {
1620 struct tty_struct *tty;
1621 int status;
1622 struct moschip_port *mos7840_port = mos7840_get_port_private(port);
1623
1624 if (mos7840_port_paranoia_check(port, __FUNCTION__)) {
1625 dbg("%s", "Invalid port \n");
1626 return;
1627 }
1628
1629 if (mos7840_port == NULL)
1630 return;
1631
1632 if (!mos7840_port->open) {
1633 dbg("%s - port not opened", __FUNCTION__);
1634 return;
1635 }
1636
1637 dbg("%s", "Entering .......... \n");
1638
1639 tty = port->tty;
1640 if (!tty) {
1641 dbg("%s - no tty available", __FUNCTION__);
1642 return;
1643 }
1644
1645 /* if we are implementing XON/XOFF, send the start character */
1646 if (I_IXOFF(tty)) {
1647 unsigned char start_char = START_CHAR(tty);
1648 status = mos7840_write(port, &start_char, 1);
1649 if (status <= 0) {
1650 return;
1651 }
1652 }
1653
1654 /* if we are implementing RTS/CTS, toggle that line */
1655 if (tty->termios->c_cflag & CRTSCTS) {
1656 mos7840_port->shadowMCR |= MCR_RTS;
1657 status = 0;
1658 status =
1659 mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER,
1660 mos7840_port->shadowMCR);
1661 if (status < 0) {
1662 return;
1663 }
1664 }
1665
1666 return;
1667 }
1668
1669 static int mos7840_tiocmget(struct usb_serial_port *port, struct file *file)
1670 {
1671 struct moschip_port *mos7840_port;
1672 unsigned int result;
1673 __u16 msr;
1674 __u16 mcr;
1675 int status = 0;
1676 mos7840_port = mos7840_get_port_private(port);
1677
1678 dbg("%s - port %d", __FUNCTION__, port->number);
1679
1680 if (mos7840_port == NULL)
1681 return -ENODEV;
1682
1683 status = mos7840_get_uart_reg(port, MODEM_STATUS_REGISTER, &msr);
1684 status = mos7840_get_uart_reg(port, MODEM_CONTROL_REGISTER, &mcr);
1685 result = ((mcr & MCR_DTR) ? TIOCM_DTR : 0)
1686 | ((mcr & MCR_RTS) ? TIOCM_RTS : 0)
1687 | ((mcr & MCR_LOOPBACK) ? TIOCM_LOOP : 0)
1688 | ((msr & MOS7840_MSR_CTS) ? TIOCM_CTS : 0)
1689 | ((msr & MOS7840_MSR_CD) ? TIOCM_CAR : 0)
1690 | ((msr & MOS7840_MSR_RI) ? TIOCM_RI : 0)
1691 | ((msr & MOS7840_MSR_DSR) ? TIOCM_DSR : 0);
1692
1693 dbg("%s - 0x%04X", __FUNCTION__, result);
1694
1695 return result;
1696 }
1697
1698 static int mos7840_tiocmset(struct usb_serial_port *port, struct file *file,
1699 unsigned int set, unsigned int clear)
1700 {
1701 struct moschip_port *mos7840_port;
1702 unsigned int mcr;
1703 unsigned int status;
1704
1705 dbg("%s - port %d", __FUNCTION__, port->number);
1706
1707 mos7840_port = mos7840_get_port_private(port);
1708
1709 if (mos7840_port == NULL)
1710 return -ENODEV;
1711
1712 mcr = mos7840_port->shadowMCR;
1713 if (clear & TIOCM_RTS)
1714 mcr &= ~MCR_RTS;
1715 if (clear & TIOCM_DTR)
1716 mcr &= ~MCR_DTR;
1717 if (clear & TIOCM_LOOP)
1718 mcr &= ~MCR_LOOPBACK;
1719
1720 if (set & TIOCM_RTS)
1721 mcr |= MCR_RTS;
1722 if (set & TIOCM_DTR)
1723 mcr |= MCR_DTR;
1724 if (set & TIOCM_LOOP)
1725 mcr |= MCR_LOOPBACK;
1726
1727 mos7840_port->shadowMCR = mcr;
1728
1729 status = 0;
1730 status = mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER, mcr);
1731 if (status < 0) {
1732 dbg("setting MODEM_CONTROL_REGISTER Failed\n");
1733 return -1;
1734 }
1735
1736 return 0;
1737 }
1738
1739 /*****************************************************************************
1740 * mos7840_calc_baud_rate_divisor
1741 * this function calculates the proper baud rate divisor for the specified
1742 * baud rate.
1743 *****************************************************************************/
1744 static int mos7840_calc_baud_rate_divisor(int baudRate, int *divisor,
1745 __u16 * clk_sel_val)
1746 {
1747
1748 dbg("%s - %d", __FUNCTION__, baudRate);
1749
1750 if (baudRate <= 115200) {
1751 *divisor = 115200 / baudRate;
1752 *clk_sel_val = 0x0;
1753 }
1754 if ((baudRate > 115200) && (baudRate <= 230400)) {
1755 *divisor = 230400 / baudRate;
1756 *clk_sel_val = 0x10;
1757 } else if ((baudRate > 230400) && (baudRate <= 403200)) {
1758 *divisor = 403200 / baudRate;
1759 *clk_sel_val = 0x20;
1760 } else if ((baudRate > 403200) && (baudRate <= 460800)) {
1761 *divisor = 460800 / baudRate;
1762 *clk_sel_val = 0x30;
1763 } else if ((baudRate > 460800) && (baudRate <= 806400)) {
1764 *divisor = 806400 / baudRate;
1765 *clk_sel_val = 0x40;
1766 } else if ((baudRate > 806400) && (baudRate <= 921600)) {
1767 *divisor = 921600 / baudRate;
1768 *clk_sel_val = 0x50;
1769 } else if ((baudRate > 921600) && (baudRate <= 1572864)) {
1770 *divisor = 1572864 / baudRate;
1771 *clk_sel_val = 0x60;
1772 } else if ((baudRate > 1572864) && (baudRate <= 3145728)) {
1773 *divisor = 3145728 / baudRate;
1774 *clk_sel_val = 0x70;
1775 }
1776 return 0;
1777
1778 #ifdef NOTMCS7840
1779
1780 for (i = 0; i < ARRAY_SIZE(mos7840_divisor_table); i++) {
1781 if (mos7840_divisor_table[i].BaudRate == baudrate) {
1782 *divisor = mos7840_divisor_table[i].Divisor;
1783 return 0;
1784 }
1785 }
1786
1787 /* After trying for all the standard baud rates *
1788 * Try calculating the divisor for this baud rate */
1789
1790 if (baudrate > 75 && baudrate < 230400) {
1791 /* get the divisor */
1792 custom = (__u16) (230400L / baudrate);
1793
1794 /* Check for round off */
1795 round1 = (__u16) (2304000L / baudrate);
1796 round = (__u16) (round1 - (custom * 10));
1797 if (round > 4) {
1798 custom++;
1799 }
1800 *divisor = custom;
1801
1802 dbg(" Baud %d = %d\n", baudrate, custom);
1803 return 0;
1804 }
1805
1806 dbg("%s\n", " Baud calculation Failed...");
1807 return -1;
1808 #endif
1809 }
1810
1811 /*****************************************************************************
1812 * mos7840_send_cmd_write_baud_rate
1813 * this function sends the proper command to change the baud rate of the
1814 * specified port.
1815 *****************************************************************************/
1816
1817 static int mos7840_send_cmd_write_baud_rate(struct moschip_port *mos7840_port,
1818 int baudRate)
1819 {
1820 int divisor = 0;
1821 int status;
1822 __u16 Data;
1823 unsigned char number;
1824 __u16 clk_sel_val;
1825 struct usb_serial_port *port;
1826
1827 if (mos7840_port == NULL)
1828 return -1;
1829
1830 port = (struct usb_serial_port *)mos7840_port->port;
1831 if (mos7840_port_paranoia_check(port, __FUNCTION__)) {
1832 dbg("%s", "Invalid port \n");
1833 return -1;
1834 }
1835
1836 if (mos7840_serial_paranoia_check(port->serial, __FUNCTION__)) {
1837 dbg("%s", "Invalid Serial \n");
1838 return -1;
1839 }
1840
1841 dbg("%s", "Entering .......... \n");
1842
1843 number = mos7840_port->port->number - mos7840_port->port->serial->minor;
1844
1845 dbg("%s - port = %d, baud = %d", __FUNCTION__,
1846 mos7840_port->port->number, baudRate);
1847 //reset clk_uart_sel in spregOffset
1848 if (baudRate > 115200) {
1849 #ifdef HW_flow_control
1850 //NOTE: need to see the pther register to modify
1851 //setting h/w flow control bit to 1;
1852 status = 0;
1853 Data = 0x2b;
1854 mos7840_port->shadowMCR = Data;
1855 status =
1856 mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER, Data);
1857 if (status < 0) {
1858 dbg("Writing spreg failed in set_serial_baud\n");
1859 return -1;
1860 }
1861 #endif
1862
1863 } else {
1864 #ifdef HW_flow_control
1865 //setting h/w flow control bit to 0;
1866 status = 0;
1867 Data = 0xb;
1868 mos7840_port->shadowMCR = Data;
1869 status =
1870 mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER, Data);
1871 if (status < 0) {
1872 dbg("Writing spreg failed in set_serial_baud\n");
1873 return -1;
1874 }
1875 #endif
1876
1877 }
1878
1879 if (1) //baudRate <= 115200)
1880 {
1881 clk_sel_val = 0x0;
1882 Data = 0x0;
1883 status = 0;
1884 status =
1885 mos7840_calc_baud_rate_divisor(baudRate, &divisor,
1886 &clk_sel_val);
1887 status =
1888 mos7840_get_reg_sync(port, mos7840_port->SpRegOffset,
1889 &Data);
1890 if (status < 0) {
1891 dbg("reading spreg failed in set_serial_baud\n");
1892 return -1;
1893 }
1894 Data = (Data & 0x8f) | clk_sel_val;
1895 status = 0;
1896 status =
1897 mos7840_set_reg_sync(port, mos7840_port->SpRegOffset, Data);
1898 if (status < 0) {
1899 dbg("Writing spreg failed in set_serial_baud\n");
1900 return -1;
1901 }
1902 /* Calculate the Divisor */
1903
1904 if (status) {
1905 err("%s - bad baud rate", __FUNCTION__);
1906 dbg("%s\n", "bad baud rate");
1907 return status;
1908 }
1909 /* Enable access to divisor latch */
1910 Data = mos7840_port->shadowLCR | SERIAL_LCR_DLAB;
1911 mos7840_port->shadowLCR = Data;
1912 mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data);
1913
1914 /* Write the divisor */
1915 Data = (unsigned char)(divisor & 0xff);
1916 dbg("set_serial_baud Value to write DLL is %x\n", Data);
1917 mos7840_set_uart_reg(port, DIVISOR_LATCH_LSB, Data);
1918
1919 Data = (unsigned char)((divisor & 0xff00) >> 8);
1920 dbg("set_serial_baud Value to write DLM is %x\n", Data);
1921 mos7840_set_uart_reg(port, DIVISOR_LATCH_MSB, Data);
1922
1923 /* Disable access to divisor latch */
1924 Data = mos7840_port->shadowLCR & ~SERIAL_LCR_DLAB;
1925 mos7840_port->shadowLCR = Data;
1926 mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data);
1927
1928 }
1929
1930 return status;
1931 }
1932
1933 /*****************************************************************************
1934 * mos7840_change_port_settings
1935 * This routine is called to set the UART on the device to match
1936 * the specified new settings.
1937 *****************************************************************************/
1938
1939 static void mos7840_change_port_settings(struct moschip_port *mos7840_port,
1940 struct ktermios *old_termios)
1941 {
1942 struct tty_struct *tty;
1943 int baud;
1944 unsigned cflag;
1945 unsigned iflag;
1946 __u8 lData;
1947 __u8 lParity;
1948 __u8 lStop;
1949 int status;
1950 __u16 Data;
1951 struct usb_serial_port *port;
1952 struct usb_serial *serial;
1953
1954 if (mos7840_port == NULL)
1955 return;
1956
1957 port = (struct usb_serial_port *)mos7840_port->port;
1958
1959 if (mos7840_port_paranoia_check(port, __FUNCTION__)) {
1960 dbg("%s", "Invalid port \n");
1961 return;
1962 }
1963
1964 if (mos7840_serial_paranoia_check(port->serial, __FUNCTION__)) {
1965 dbg("%s", "Invalid Serial \n");
1966 return;
1967 }
1968
1969 serial = port->serial;
1970
1971 dbg("%s - port %d", __FUNCTION__, mos7840_port->port->number);
1972
1973 if (!mos7840_port->open) {
1974 dbg("%s - port not opened", __FUNCTION__);
1975 return;
1976 }
1977
1978 tty = mos7840_port->port->tty;
1979
1980 if ((!tty) || (!tty->termios)) {
1981 dbg("%s - no tty structures", __FUNCTION__);
1982 return;
1983 }
1984
1985 dbg("%s", "Entering .......... \n");
1986
1987 lData = LCR_BITS_8;
1988 lStop = LCR_STOP_1;
1989 lParity = LCR_PAR_NONE;
1990
1991 cflag = tty->termios->c_cflag;
1992 iflag = tty->termios->c_iflag;
1993
1994 /* Change the number of bits */
1995 if (cflag & CSIZE) {
1996 switch (cflag & CSIZE) {
1997 case CS5:
1998 lData = LCR_BITS_5;
1999 break;
2000
2001 case CS6:
2002 lData = LCR_BITS_6;
2003 break;
2004
2005 case CS7:
2006 lData = LCR_BITS_7;
2007 break;
2008 default:
2009 case CS8:
2010 lData = LCR_BITS_8;
2011 break;
2012 }
2013 }
2014 /* Change the Parity bit */
2015 if (cflag & PARENB) {
2016 if (cflag & PARODD) {
2017 lParity = LCR_PAR_ODD;
2018 dbg("%s - parity = odd", __FUNCTION__);
2019 } else {
2020 lParity = LCR_PAR_EVEN;
2021 dbg("%s - parity = even", __FUNCTION__);
2022 }
2023
2024 } else {
2025 dbg("%s - parity = none", __FUNCTION__);
2026 }
2027
2028 if (cflag & CMSPAR) {
2029 lParity = lParity | 0x20;
2030 }
2031
2032 /* Change the Stop bit */
2033 if (cflag & CSTOPB) {
2034 lStop = LCR_STOP_2;
2035 dbg("%s - stop bits = 2", __FUNCTION__);
2036 } else {
2037 lStop = LCR_STOP_1;
2038 dbg("%s - stop bits = 1", __FUNCTION__);
2039 }
2040
2041 /* Update the LCR with the correct value */
2042 mos7840_port->shadowLCR &=
2043 ~(LCR_BITS_MASK | LCR_STOP_MASK | LCR_PAR_MASK);
2044 mos7840_port->shadowLCR |= (lData | lParity | lStop);
2045
2046 dbg("mos7840_change_port_settings mos7840_port->shadowLCR is %x\n",
2047 mos7840_port->shadowLCR);
2048 /* Disable Interrupts */
2049 Data = 0x00;
2050 mos7840_set_uart_reg(port, INTERRUPT_ENABLE_REGISTER, Data);
2051
2052 Data = 0x00;
2053 mos7840_set_uart_reg(port, FIFO_CONTROL_REGISTER, Data);
2054
2055 Data = 0xcf;
2056 mos7840_set_uart_reg(port, FIFO_CONTROL_REGISTER, Data);
2057
2058 /* Send the updated LCR value to the mos7840 */
2059 Data = mos7840_port->shadowLCR;
2060
2061 mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data);
2062
2063 Data = 0x00b;
2064 mos7840_port->shadowMCR = Data;
2065 mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER, Data);
2066 Data = 0x00b;
2067 mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER, Data);
2068
2069 /* set up the MCR register and send it to the mos7840 */
2070
2071 mos7840_port->shadowMCR = MCR_MASTER_IE;
2072 if (cflag & CBAUD) {
2073 mos7840_port->shadowMCR |= (MCR_DTR | MCR_RTS);
2074 }
2075
2076 if (cflag & CRTSCTS) {
2077 mos7840_port->shadowMCR |= (MCR_XON_ANY);
2078
2079 } else {
2080 mos7840_port->shadowMCR &= ~(MCR_XON_ANY);
2081 }
2082
2083 Data = mos7840_port->shadowMCR;
2084 mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER, Data);
2085
2086 /* Determine divisor based on baud rate */
2087 baud = tty_get_baud_rate(tty);
2088
2089 if (!baud) {
2090 /* pick a default, any default... */
2091 dbg("%s\n", "Picked default baud...");
2092 baud = 9600;
2093 }
2094
2095 dbg("%s - baud rate = %d", __FUNCTION__, baud);
2096 status = mos7840_send_cmd_write_baud_rate(mos7840_port, baud);
2097
2098 /* Enable Interrupts */
2099 Data = 0x0c;
2100 mos7840_set_uart_reg(port, INTERRUPT_ENABLE_REGISTER, Data);
2101
2102 if (mos7840_port->read_urb->status != -EINPROGRESS) {
2103 mos7840_port->read_urb->dev = serial->dev;
2104
2105 status = usb_submit_urb(mos7840_port->read_urb, GFP_ATOMIC);
2106
2107 if (status) {
2108 dbg(" usb_submit_urb(read bulk) failed, status = %d",
2109 status);
2110 }
2111 }
2112 wake_up(&mos7840_port->delta_msr_wait);
2113 mos7840_port->delta_msr_cond = 1;
2114 dbg("mos7840_change_port_settings mos7840_port->shadowLCR is End %x\n",
2115 mos7840_port->shadowLCR);
2116
2117 return;
2118 }
2119
2120 /*****************************************************************************
2121 * mos7840_set_termios
2122 * this function is called by the tty driver when it wants to change
2123 * the termios structure
2124 *****************************************************************************/
2125
2126 static void mos7840_set_termios(struct usb_serial_port *port,
2127 struct ktermios *old_termios)
2128 {
2129 int status;
2130 unsigned int cflag;
2131 struct usb_serial *serial;
2132 struct moschip_port *mos7840_port;
2133 struct tty_struct *tty;
2134 dbg("mos7840_set_termios: START\n");
2135 if (mos7840_port_paranoia_check(port, __FUNCTION__)) {
2136 dbg("%s", "Invalid port \n");
2137 return;
2138 }
2139
2140 serial = port->serial;
2141
2142 if (mos7840_serial_paranoia_check(serial, __FUNCTION__)) {
2143 dbg("%s", "Invalid Serial \n");
2144 return;
2145 }
2146
2147 mos7840_port = mos7840_get_port_private(port);
2148
2149 if (mos7840_port == NULL)
2150 return;
2151
2152 tty = port->tty;
2153
2154 if (!port->tty || !port->tty->termios) {
2155 dbg("%s - no tty or termios", __FUNCTION__);
2156 return;
2157 }
2158
2159 if (!mos7840_port->open) {
2160 dbg("%s - port not opened", __FUNCTION__);
2161 return;
2162 }
2163
2164 dbg("%s\n", "setting termios - ");
2165
2166 cflag = tty->termios->c_cflag;
2167
2168 if (!cflag) {
2169 dbg("%s %s\n", __FUNCTION__, "cflag is NULL");
2170 return;
2171 }
2172
2173 dbg("%s - clfag %08x iflag %08x", __FUNCTION__,
2174 tty->termios->c_cflag, RELEVANT_IFLAG(tty->termios->c_iflag));
2175
2176 if (old_termios) {
2177 dbg("%s - old clfag %08x old iflag %08x", __FUNCTION__,
2178 old_termios->c_cflag, RELEVANT_IFLAG(old_termios->c_iflag));
2179 }
2180
2181 dbg("%s - port %d", __FUNCTION__, port->number);
2182
2183 /* change the port settings to the new ones specified */
2184
2185 mos7840_change_port_settings(mos7840_port, old_termios);
2186
2187 if (!mos7840_port->read_urb) {
2188 dbg("%s", "URB KILLED !!!!!\n");
2189 return;
2190 }
2191
2192 if (mos7840_port->read_urb->status != -EINPROGRESS) {
2193 mos7840_port->read_urb->dev = serial->dev;
2194 status = usb_submit_urb(mos7840_port->read_urb, GFP_ATOMIC);
2195 if (status) {
2196 dbg(" usb_submit_urb(read bulk) failed, status = %d",
2197 status);
2198 }
2199 }
2200 return;
2201 }
2202
2203 /*****************************************************************************
2204 * mos7840_get_lsr_info - get line status register info
2205 *
2206 * Purpose: Let user call ioctl() to get info when the UART physically
2207 * is emptied. On bus types like RS485, the transmitter must
2208 * release the bus after transmitting. This must be done when
2209 * the transmit shift register is empty, not be done when the
2210 * transmit holding register is empty. This functionality
2211 * allows an RS485 driver to be written in user space.
2212 *****************************************************************************/
2213
2214 static int mos7840_get_lsr_info(struct moschip_port *mos7840_port,
2215 unsigned int __user *value)
2216 {
2217 int count;
2218 unsigned int result = 0;
2219
2220 count = mos7840_chars_in_buffer(mos7840_port->port);
2221 if (count == 0) {
2222 dbg("%s -- Empty", __FUNCTION__);
2223 result = TIOCSER_TEMT;
2224 }
2225
2226 if (copy_to_user(value, &result, sizeof(int)))
2227 return -EFAULT;
2228 return 0;
2229 }
2230
2231 /*****************************************************************************
2232 * mos7840_set_modem_info
2233 * function to set modem info
2234 *****************************************************************************/
2235
2236 static int mos7840_set_modem_info(struct moschip_port *mos7840_port,
2237 unsigned int cmd, unsigned int __user *value)
2238 {
2239 unsigned int mcr;
2240 unsigned int arg;
2241 __u16 Data;
2242 int status;
2243 struct usb_serial_port *port;
2244
2245 if (mos7840_port == NULL)
2246 return -1;
2247
2248 port = (struct usb_serial_port *)mos7840_port->port;
2249 if (mos7840_port_paranoia_check(port, __FUNCTION__)) {
2250 dbg("%s", "Invalid port \n");
2251 return -1;
2252 }
2253
2254 mcr = mos7840_port->shadowMCR;
2255
2256 if (copy_from_user(&arg, value, sizeof(int)))
2257 return -EFAULT;
2258
2259 switch (cmd) {
2260 case TIOCMBIS:
2261 if (arg & TIOCM_RTS)
2262 mcr |= MCR_RTS;
2263 if (arg & TIOCM_DTR)
2264 mcr |= MCR_RTS;
2265 if (arg & TIOCM_LOOP)
2266 mcr |= MCR_LOOPBACK;
2267 break;
2268
2269 case TIOCMBIC:
2270 if (arg & TIOCM_RTS)
2271 mcr &= ~MCR_RTS;
2272 if (arg & TIOCM_DTR)
2273 mcr &= ~MCR_RTS;
2274 if (arg & TIOCM_LOOP)
2275 mcr &= ~MCR_LOOPBACK;
2276 break;
2277
2278 case TIOCMSET:
2279 /* turn off the RTS and DTR and LOOPBACK
2280 * and then only turn on what was asked to */
2281 mcr &= ~(MCR_RTS | MCR_DTR | MCR_LOOPBACK);
2282 mcr |= ((arg & TIOCM_RTS) ? MCR_RTS : 0);
2283 mcr |= ((arg & TIOCM_DTR) ? MCR_DTR : 0);
2284 mcr |= ((arg & TIOCM_LOOP) ? MCR_LOOPBACK : 0);
2285 break;
2286 }
2287
2288 mos7840_port->shadowMCR = mcr;
2289
2290 Data = mos7840_port->shadowMCR;
2291 status = 0;
2292 status = mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER, Data);
2293 if (status < 0) {
2294 dbg("setting MODEM_CONTROL_REGISTER Failed\n");
2295 return -1;
2296 }
2297
2298 return 0;
2299 }
2300
2301 /*****************************************************************************
2302 * mos7840_get_modem_info
2303 * function to get modem info
2304 *****************************************************************************/
2305
2306 static int mos7840_get_modem_info(struct moschip_port *mos7840_port,
2307 unsigned int __user *value)
2308 {
2309 unsigned int result = 0;
2310 __u16 msr;
2311 unsigned int mcr = mos7840_port->shadowMCR;
2312 int status = 0;
2313 status =
2314 mos7840_get_uart_reg(mos7840_port->port, MODEM_STATUS_REGISTER,
2315 &msr);
2316 result = ((mcr & MCR_DTR) ? TIOCM_DTR : 0) /* 0x002 */
2317 |((mcr & MCR_RTS) ? TIOCM_RTS : 0) /* 0x004 */
2318 |((msr & MOS7840_MSR_CTS) ? TIOCM_CTS : 0) /* 0x020 */
2319 |((msr & MOS7840_MSR_CD) ? TIOCM_CAR : 0) /* 0x040 */
2320 |((msr & MOS7840_MSR_RI) ? TIOCM_RI : 0) /* 0x080 */
2321 |((msr & MOS7840_MSR_DSR) ? TIOCM_DSR : 0); /* 0x100 */
2322
2323 dbg("%s -- %x", __FUNCTION__, result);
2324
2325 if (copy_to_user(value, &result, sizeof(int)))
2326 return -EFAULT;
2327 return 0;
2328 }
2329
2330 /*****************************************************************************
2331 * mos7840_get_serial_info
2332 * function to get information about serial port
2333 *****************************************************************************/
2334
2335 static int mos7840_get_serial_info(struct moschip_port *mos7840_port,
2336 struct serial_struct __user *retinfo)
2337 {
2338 struct serial_struct tmp;
2339
2340 if (mos7840_port == NULL)
2341 return -1;
2342
2343 if (!retinfo)
2344 return -EFAULT;
2345
2346 memset(&tmp, 0, sizeof(tmp));
2347
2348 tmp.type = PORT_16550A;
2349 tmp.line = mos7840_port->port->serial->minor;
2350 tmp.port = mos7840_port->port->number;
2351 tmp.irq = 0;
2352 tmp.flags = ASYNC_SKIP_TEST | ASYNC_AUTO_IRQ;
2353 tmp.xmit_fifo_size = NUM_URBS * URB_TRANSFER_BUFFER_SIZE;
2354 tmp.baud_base = 9600;
2355 tmp.close_delay = 5 * HZ;
2356 tmp.closing_wait = 30 * HZ;
2357
2358 if (copy_to_user(retinfo, &tmp, sizeof(*retinfo)))
2359 return -EFAULT;
2360 return 0;
2361 }
2362
2363 /*****************************************************************************
2364 * SerialIoctl
2365 * this function handles any ioctl calls to the driver
2366 *****************************************************************************/
2367
2368 static int mos7840_ioctl(struct usb_serial_port *port, struct file *file,
2369 unsigned int cmd, unsigned long arg)
2370 {
2371 void __user *argp = (void __user *)arg;
2372 struct moschip_port *mos7840_port;
2373 struct tty_struct *tty;
2374
2375 struct async_icount cnow;
2376 struct async_icount cprev;
2377 struct serial_icounter_struct icount;
2378 int mosret = 0;
2379
2380 if (mos7840_port_paranoia_check(port, __FUNCTION__)) {
2381 dbg("%s", "Invalid port \n");
2382 return -1;
2383 }
2384
2385 mos7840_port = mos7840_get_port_private(port);
2386
2387 if (mos7840_port == NULL)
2388 return -1;
2389
2390 tty = mos7840_port->port->tty;
2391
2392 dbg("%s - port %d, cmd = 0x%x", __FUNCTION__, port->number, cmd);
2393
2394 switch (cmd) {
2395 /* return number of bytes available */
2396
2397 case TIOCSERGETLSR:
2398 dbg("%s (%d) TIOCSERGETLSR", __FUNCTION__, port->number);
2399 return mos7840_get_lsr_info(mos7840_port, argp);
2400 return 0;
2401
2402 case TIOCMBIS:
2403 case TIOCMBIC:
2404 case TIOCMSET:
2405 dbg("%s (%d) TIOCMSET/TIOCMBIC/TIOCMSET", __FUNCTION__,
2406 port->number);
2407 mosret =
2408 mos7840_set_modem_info(mos7840_port, cmd, argp);
2409 return mosret;
2410
2411 case TIOCMGET:
2412 dbg("%s (%d) TIOCMGET", __FUNCTION__, port->number);
2413 return mos7840_get_modem_info(mos7840_port, argp);
2414
2415 case TIOCGSERIAL:
2416 dbg("%s (%d) TIOCGSERIAL", __FUNCTION__, port->number);
2417 return mos7840_get_serial_info(mos7840_port, argp);
2418
2419 case TIOCSSERIAL:
2420 dbg("%s (%d) TIOCSSERIAL", __FUNCTION__, port->number);
2421 break;
2422
2423 case TIOCMIWAIT:
2424 dbg("%s (%d) TIOCMIWAIT", __FUNCTION__, port->number);
2425 cprev = mos7840_port->icount;
2426 while (1) {
2427 //interruptible_sleep_on(&mos7840_port->delta_msr_wait);
2428 mos7840_port->delta_msr_cond = 0;
2429 wait_event_interruptible(mos7840_port->delta_msr_wait,
2430 (mos7840_port->
2431 delta_msr_cond == 1));
2432
2433 /* see if a signal did it */
2434 if (signal_pending(current))
2435 return -ERESTARTSYS;
2436 cnow = mos7840_port->icount;
2437 smp_rmb();
2438 if (cnow.rng == cprev.rng && cnow.dsr == cprev.dsr &&
2439 cnow.dcd == cprev.dcd && cnow.cts == cprev.cts)
2440 return -EIO; /* no change => error */
2441 if (((arg & TIOCM_RNG) && (cnow.rng != cprev.rng)) ||
2442 ((arg & TIOCM_DSR) && (cnow.dsr != cprev.dsr)) ||
2443 ((arg & TIOCM_CD) && (cnow.dcd != cprev.dcd)) ||
2444 ((arg & TIOCM_CTS) && (cnow.cts != cprev.cts))) {
2445 return 0;
2446 }
2447 cprev = cnow;
2448 }
2449 /* NOTREACHED */
2450 break;
2451
2452 case TIOCGICOUNT:
2453 cnow = mos7840_port->icount;
2454 smp_rmb();
2455 icount.cts = cnow.cts;
2456 icount.dsr = cnow.dsr;
2457 icount.rng = cnow.rng;
2458 icount.dcd = cnow.dcd;
2459 icount.rx = cnow.rx;
2460 icount.tx = cnow.tx;
2461 icount.frame = cnow.frame;
2462 icount.overrun = cnow.overrun;
2463 icount.parity = cnow.parity;
2464 icount.brk = cnow.brk;
2465 icount.buf_overrun = cnow.buf_overrun;
2466
2467 dbg("%s (%d) TIOCGICOUNT RX=%d, TX=%d", __FUNCTION__,
2468 port->number, icount.rx, icount.tx);
2469 if (copy_to_user(argp, &icount, sizeof(icount)))
2470 return -EFAULT;
2471 return 0;
2472
2473 case TIOCEXBAUD:
2474 return 0;
2475 default:
2476 break;
2477 }
2478
2479 return -ENOIOCTLCMD;
2480 }
2481
2482 static int mos7840_calc_num_ports(struct usb_serial *serial)
2483 {
2484 int mos7840_num_ports = 0;
2485
2486 dbg("numberofendpoints: %d \n",
2487 (int)serial->interface->cur_altsetting->desc.bNumEndpoints);
2488 dbg("numberofendpoints: %d \n",
2489 (int)serial->interface->altsetting->desc.bNumEndpoints);
2490 if (serial->interface->cur_altsetting->desc.bNumEndpoints == 5) {
2491 mos7840_num_ports = serial->num_ports = 2;
2492 } else if (serial->interface->cur_altsetting->desc.bNumEndpoints == 9) {
2493 serial->num_bulk_in = 4;
2494 serial->num_bulk_out = 4;
2495 mos7840_num_ports = serial->num_ports = 4;
2496 }
2497
2498 return mos7840_num_ports;
2499 }
2500
2501 /****************************************************************************
2502 * mos7840_startup
2503 ****************************************************************************/
2504
2505 static int mos7840_startup(struct usb_serial *serial)
2506 {
2507 struct moschip_port *mos7840_port;
2508 struct usb_device *dev;
2509 int i, status;
2510
2511 __u16 Data;
2512 dbg("%s \n", " mos7840_startup :entering..........");
2513
2514 if (!serial) {
2515 dbg("%s\n", "Invalid Handler");
2516 return -1;
2517 }
2518
2519 dev = serial->dev;
2520
2521 dbg("%s\n", "Entering...");
2522
2523 /* we set up the pointers to the endpoints in the mos7840_open *
2524 * function, as the structures aren't created yet. */
2525
2526 /* set up port private structures */
2527 for (i = 0; i < serial->num_ports; ++i) {
2528 mos7840_port = kzalloc(sizeof(struct moschip_port), GFP_KERNEL);
2529 if (mos7840_port == NULL) {
2530 err("%s - Out of memory", __FUNCTION__);
2531 status = -ENOMEM;
2532 i--; /* don't follow NULL pointer cleaning up */
2533 goto error;
2534 }
2535
2536 /* Initialize all port interrupt end point to port 0 int endpoint *
2537 * Our device has only one interrupt end point comman to all port */
2538
2539 mos7840_port->port = serial->port[i];
2540 mos7840_set_port_private(serial->port[i], mos7840_port);
2541 spin_lock_init(&mos7840_port->pool_lock);
2542
2543 mos7840_port->port_num = ((serial->port[i]->number -
2544 (serial->port[i]->serial->minor)) +
2545 1);
2546
2547 if (mos7840_port->port_num == 1) {
2548 mos7840_port->SpRegOffset = 0x0;
2549 mos7840_port->ControlRegOffset = 0x1;
2550 mos7840_port->DcrRegOffset = 0x4;
2551 } else if ((mos7840_port->port_num == 2)
2552 && (serial->num_ports == 4)) {
2553 mos7840_port->SpRegOffset = 0x8;
2554 mos7840_port->ControlRegOffset = 0x9;
2555 mos7840_port->DcrRegOffset = 0x16;
2556 } else if ((mos7840_port->port_num == 2)
2557 && (serial->num_ports == 2)) {
2558 mos7840_port->SpRegOffset = 0xa;
2559 mos7840_port->ControlRegOffset = 0xb;
2560 mos7840_port->DcrRegOffset = 0x19;
2561 } else if ((mos7840_port->port_num == 3)
2562 && (serial->num_ports == 4)) {
2563 mos7840_port->SpRegOffset = 0xa;
2564 mos7840_port->ControlRegOffset = 0xb;
2565 mos7840_port->DcrRegOffset = 0x19;
2566 } else if ((mos7840_port->port_num == 4)
2567 && (serial->num_ports == 4)) {
2568 mos7840_port->SpRegOffset = 0xc;
2569 mos7840_port->ControlRegOffset = 0xd;
2570 mos7840_port->DcrRegOffset = 0x1c;
2571 }
2572 mos7840_dump_serial_port(mos7840_port);
2573
2574 mos7840_set_port_private(serial->port[i], mos7840_port);
2575
2576 //enable rx_disable bit in control register
2577
2578 status =
2579 mos7840_get_reg_sync(serial->port[i],
2580 mos7840_port->ControlRegOffset, &Data);
2581 if (status < 0) {
2582 dbg("Reading ControlReg failed status-0x%x\n", status);
2583 break;
2584 } else
2585 dbg("ControlReg Reading success val is %x, status%d\n",
2586 Data, status);
2587 Data |= 0x08; //setting driver done bit
2588 Data |= 0x04; //sp1_bit to have cts change reflect in modem status reg
2589
2590 //Data |= 0x20; //rx_disable bit
2591 status = 0;
2592 status =
2593 mos7840_set_reg_sync(serial->port[i],
2594 mos7840_port->ControlRegOffset, Data);
2595 if (status < 0) {
2596 dbg("Writing ControlReg failed(rx_disable) status-0x%x\n", status);
2597 break;
2598 } else
2599 dbg("ControlReg Writing success(rx_disable) status%d\n",
2600 status);
2601
2602 //Write default values in DCR (i.e 0x01 in DCR0, 0x05 in DCR2 and 0x24 in DCR3
2603 Data = 0x01;
2604 status = 0;
2605 status =
2606 mos7840_set_reg_sync(serial->port[i],
2607 (__u16) (mos7840_port->DcrRegOffset +
2608 0), Data);
2609 if (status < 0) {
2610 dbg("Writing DCR0 failed status-0x%x\n", status);
2611 break;
2612 } else
2613 dbg("DCR0 Writing success status%d\n", status);
2614
2615 Data = 0x05;
2616 status = 0;
2617 status =
2618 mos7840_set_reg_sync(serial->port[i],
2619 (__u16) (mos7840_port->DcrRegOffset +
2620 1), Data);
2621 if (status < 0) {
2622 dbg("Writing DCR1 failed status-0x%x\n", status);
2623 break;
2624 } else
2625 dbg("DCR1 Writing success status%d\n", status);
2626
2627 Data = 0x24;
2628 status = 0;
2629 status =
2630 mos7840_set_reg_sync(serial->port[i],
2631 (__u16) (mos7840_port->DcrRegOffset +
2632 2), Data);
2633 if (status < 0) {
2634 dbg("Writing DCR2 failed status-0x%x\n", status);
2635 break;
2636 } else
2637 dbg("DCR2 Writing success status%d\n", status);
2638
2639 // write values in clkstart0x0 and clkmulti 0x20
2640 Data = 0x0;
2641 status = 0;
2642 status =
2643 mos7840_set_reg_sync(serial->port[i],
2644 CLK_START_VALUE_REGISTER, Data);
2645 if (status < 0) {
2646 dbg("Writing CLK_START_VALUE_REGISTER failed status-0x%x\n", status);
2647 break;
2648 } else
2649 dbg("CLK_START_VALUE_REGISTER Writing success status%d\n", status);
2650
2651 Data = 0x20;
2652 status =
2653 mos7840_set_reg_sync(serial->port[i], CLK_MULTI_REGISTER,
2654 Data);
2655 if (status < 0) {
2656 dbg("Writing CLK_MULTI_REGISTER failed status-0x%x\n",
2657 status);
2658 goto error;
2659 } else
2660 dbg("CLK_MULTI_REGISTER Writing success status%d\n",
2661 status);
2662
2663 //write value 0x0 to scratchpad register
2664 Data = 0x00;
2665 status =
2666 mos7840_set_uart_reg(serial->port[i], SCRATCH_PAD_REGISTER,
2667 Data);
2668 if (status < 0) {
2669 dbg("Writing SCRATCH_PAD_REGISTER failed status-0x%x\n",
2670 status);
2671 break;
2672 } else
2673 dbg("SCRATCH_PAD_REGISTER Writing success status%d\n",
2674 status);
2675
2676 //Zero Length flag register
2677 if ((mos7840_port->port_num != 1)
2678 && (serial->num_ports == 2)) {
2679
2680 Data = 0xff;
2681 status = 0;
2682 status = mos7840_set_reg_sync(serial->port[i],
2683 (__u16) (ZLP_REG1 +
2684 ((__u16)
2685 mos7840_port->
2686 port_num)),
2687 Data);
2688 dbg("ZLIP offset%x\n",
2689 (__u16) (ZLP_REG1 +
2690 ((__u16) mos7840_port->port_num)));
2691 if (status < 0) {
2692 dbg("Writing ZLP_REG%d failed status-0x%x\n",
2693 i + 2, status);
2694 break;
2695 } else
2696 dbg("ZLP_REG%d Writing success status%d\n",
2697 i + 2, status);
2698 } else {
2699 Data = 0xff;
2700 status = 0;
2701 status = mos7840_set_reg_sync(serial->port[i],
2702 (__u16) (ZLP_REG1 +
2703 ((__u16)
2704 mos7840_port->
2705 port_num) -
2706 0x1), Data);
2707 dbg("ZLIP offset%x\n",
2708 (__u16) (ZLP_REG1 +
2709 ((__u16) mos7840_port->port_num) - 0x1));
2710 if (status < 0) {
2711 dbg("Writing ZLP_REG%d failed status-0x%x\n",
2712 i + 1, status);
2713 break;
2714 } else
2715 dbg("ZLP_REG%d Writing success status%d\n",
2716 i + 1, status);
2717
2718 }
2719 mos7840_port->control_urb = usb_alloc_urb(0, GFP_KERNEL);
2720 mos7840_port->ctrl_buf = kmalloc(16, GFP_KERNEL);
2721 mos7840_port->dr = kmalloc(sizeof(struct usb_ctrlrequest), GFP_KERNEL);
2722 if (!mos7840_port->control_urb || !mos7840_port->ctrl_buf || !mos7840_port->dr) {
2723 status = -ENOMEM;
2724 goto error;
2725 }
2726 }
2727
2728 //Zero Length flag enable
2729 Data = 0x0f;
2730 status = mos7840_set_reg_sync(serial->port[0], ZLP_REG5, Data);
2731 if (status < 0) {
2732 dbg("Writing ZLP_REG5 failed status-0x%x\n", status);
2733 return -1;
2734 } else
2735 dbg("ZLP_REG5 Writing success status%d\n", status);
2736
2737 /* setting configuration feature to one */
2738 usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0),
2739 (__u8) 0x03, 0x00, 0x01, 0x00, NULL, 0x00, 5 * HZ);
2740 return 0;
2741 error:
2742 for (/* nothing */; i >= 0; i--) {
2743 mos7840_port = mos7840_get_port_private(serial->port[i]);
2744
2745 kfree(mos7840_port->dr);
2746 kfree(mos7840_port->ctrl_buf);
2747 usb_free_urb(mos7840_port->control_urb);
2748 kfree(mos7840_port);
2749 serial->port[i] = NULL;
2750 }
2751 return status;
2752 }
2753
2754 /****************************************************************************
2755 * mos7840_shutdown
2756 * This function is called whenever the device is removed from the usb bus.
2757 ****************************************************************************/
2758
2759 static void mos7840_shutdown(struct usb_serial *serial)
2760 {
2761 int i;
2762 unsigned long flags;
2763 struct moschip_port *mos7840_port;
2764 dbg("%s \n", " shutdown :entering..........");
2765
2766 if (!serial) {
2767 dbg("%s", "Invalid Handler \n");
2768 return;
2769 }
2770
2771 /* check for the ports to be closed,close the ports and disconnect */
2772
2773 /* free private structure allocated for serial port *
2774 * stop reads and writes on all ports */
2775
2776 for (i = 0; i < serial->num_ports; ++i) {
2777 mos7840_port = mos7840_get_port_private(serial->port[i]);
2778 spin_lock_irqsave(&mos7840_port->pool_lock, flags);
2779 mos7840_port->zombie = 1;
2780 spin_unlock_irqrestore(&mos7840_port->pool_lock, flags);
2781 usb_kill_urb(mos7840_port->control_urb);
2782 kfree(mos7840_port->ctrl_buf);
2783 kfree(mos7840_port->dr);
2784 kfree(mos7840_port);
2785 mos7840_set_port_private(serial->port[i], NULL);
2786 }
2787
2788 dbg("%s\n", "Thank u :: ");
2789
2790 }
2791
2792 static struct usb_driver io_driver = {
2793 .name = "mos7840",
2794 .probe = usb_serial_probe,
2795 .disconnect = usb_serial_disconnect,
2796 .id_table = moschip_id_table_combined,
2797 .no_dynamic_id = 1,
2798 };
2799
2800 static struct usb_serial_driver moschip7840_4port_device = {
2801 .driver = {
2802 .owner = THIS_MODULE,
2803 .name = "mos7840",
2804 },
2805 .description = DRIVER_DESC,
2806 .usb_driver = &io_driver,
2807 .id_table = moschip_port_id_table,
2808 .num_interrupt_in = 1, //NUM_DONT_CARE,//1,
2809 #ifdef check
2810 .num_bulk_in = 4,
2811 .num_bulk_out = 4,
2812 .num_ports = 4,
2813 #endif
2814 .open = mos7840_open,
2815 .close = mos7840_close,
2816 .write = mos7840_write,
2817 .write_room = mos7840_write_room,
2818 .chars_in_buffer = mos7840_chars_in_buffer,
2819 .throttle = mos7840_throttle,
2820 .unthrottle = mos7840_unthrottle,
2821 .calc_num_ports = mos7840_calc_num_ports,
2822 #ifdef MCSSerialProbe
2823 .probe = mos7840_serial_probe,
2824 #endif
2825 .ioctl = mos7840_ioctl,
2826 .set_termios = mos7840_set_termios,
2827 .break_ctl = mos7840_break,
2828 .tiocmget = mos7840_tiocmget,
2829 .tiocmset = mos7840_tiocmset,
2830 .attach = mos7840_startup,
2831 .shutdown = mos7840_shutdown,
2832 .read_bulk_callback = mos7840_bulk_in_callback,
2833 .read_int_callback = mos7840_interrupt_callback,
2834 };
2835
2836 /****************************************************************************
2837 * moschip7840_init
2838 * This is called by the module subsystem, or on startup to initialize us
2839 ****************************************************************************/
2840 static int __init moschip7840_init(void)
2841 {
2842 int retval;
2843
2844 dbg("%s \n", " mos7840_init :entering..........");
2845
2846 /* Register with the usb serial */
2847 retval = usb_serial_register(&moschip7840_4port_device);
2848
2849 if (retval)
2850 goto failed_port_device_register;
2851
2852 dbg("%s\n", "Entring...");
2853 info(DRIVER_DESC " " DRIVER_VERSION);
2854
2855 /* Register with the usb */
2856 retval = usb_register(&io_driver);
2857
2858 if (retval)
2859 goto failed_usb_register;
2860
2861 if (retval == 0) {
2862 dbg("%s\n", "Leaving...");
2863 return 0;
2864 }
2865
2866 failed_usb_register:
2867 usb_serial_deregister(&moschip7840_4port_device);
2868
2869 failed_port_device_register:
2870
2871 return retval;
2872 }
2873
2874 /****************************************************************************
2875 * moschip7840_exit
2876 * Called when the driver is about to be unloaded.
2877 ****************************************************************************/
2878 static void __exit moschip7840_exit(void)
2879 {
2880
2881 dbg("%s \n", " mos7840_exit :entering..........");
2882
2883 usb_deregister(&io_driver);
2884
2885 usb_serial_deregister(&moschip7840_4port_device);
2886
2887 dbg("%s\n", "Entring...");
2888 }
2889
2890 module_init(moschip7840_init);
2891 module_exit(moschip7840_exit);
2892
2893 /* Module information */
2894 MODULE_DESCRIPTION(DRIVER_DESC);
2895 MODULE_LICENSE("GPL");
2896
2897 module_param(debug, bool, S_IRUGO | S_IWUSR);
2898 MODULE_PARM_DESC(debug, "Debug enabled or not");
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