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kmemtrace: SLOB hooks.
[linux-2.6/kmemtrace.git] / drivers / usb / serial / mos7840.c
blob78f2f6db494d790fb4d00d75c0ef9c1229ef89ef
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 /* The native mos7840/7820 component */
114 #define USB_VENDOR_ID_MOSCHIP 0x9710
115 #define MOSCHIP_DEVICE_ID_7840 0x7840
116 #define MOSCHIP_DEVICE_ID_7820 0x7820
117 /* The native component can have its vendor/device id's overridden
118 * in vendor-specific implementations. Such devices can be handled
119 * by making a change here, in moschip_port_id_table, and in
120 * moschip_id_table_combined
121 */
122 #define USB_VENDOR_ID_BANDB 0x0856
123 #define BANDB_DEVICE_ID_USOPTL4_4 0xAC44
124 #define BANDB_DEVICE_ID_USOPTL4_2 0xAC42
125
126 /* Interrupt Routine Defines */
127
128 #define SERIAL_IIR_RLS 0x06
129 #define SERIAL_IIR_MS 0x00
130
131 /*
132 * Emulation of the bit mask on the LINE STATUS REGISTER.
133 */
134 #define SERIAL_LSR_DR 0x0001
135 #define SERIAL_LSR_OE 0x0002
136 #define SERIAL_LSR_PE 0x0004
137 #define SERIAL_LSR_FE 0x0008
138 #define SERIAL_LSR_BI 0x0010
139
140 #define MOS_MSR_DELTA_CTS 0x10
141 #define MOS_MSR_DELTA_DSR 0x20
142 #define MOS_MSR_DELTA_RI 0x40
143 #define MOS_MSR_DELTA_CD 0x80
144
145 // Serial Port register Address
146 #define INTERRUPT_ENABLE_REGISTER ((__u16)(0x01))
147 #define FIFO_CONTROL_REGISTER ((__u16)(0x02))
148 #define LINE_CONTROL_REGISTER ((__u16)(0x03))
149 #define MODEM_CONTROL_REGISTER ((__u16)(0x04))
150 #define LINE_STATUS_REGISTER ((__u16)(0x05))
151 #define MODEM_STATUS_REGISTER ((__u16)(0x06))
152 #define SCRATCH_PAD_REGISTER ((__u16)(0x07))
153 #define DIVISOR_LATCH_LSB ((__u16)(0x00))
154 #define DIVISOR_LATCH_MSB ((__u16)(0x01))
155
156 #define CLK_MULTI_REGISTER ((__u16)(0x02))
157 #define CLK_START_VALUE_REGISTER ((__u16)(0x03))
158
159 #define SERIAL_LCR_DLAB ((__u16)(0x0080))
160
161 /*
162 * URB POOL related defines
163 */
164 #define NUM_URBS 16 /* URB Count */
165 #define URB_TRANSFER_BUFFER_SIZE 32 /* URB Size */
166
167
168 static struct usb_device_id moschip_port_id_table[] = {
169 {USB_DEVICE(USB_VENDOR_ID_MOSCHIP, MOSCHIP_DEVICE_ID_7840)},
170 {USB_DEVICE(USB_VENDOR_ID_MOSCHIP, MOSCHIP_DEVICE_ID_7820)},
171 {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USOPTL4_4)},
172 {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USOPTL4_2)},
173 {} /* terminating entry */
174 };
175
176 static __devinitdata struct usb_device_id moschip_id_table_combined[] = {
177 {USB_DEVICE(USB_VENDOR_ID_MOSCHIP, MOSCHIP_DEVICE_ID_7840)},
178 {USB_DEVICE(USB_VENDOR_ID_MOSCHIP, MOSCHIP_DEVICE_ID_7820)},
179 {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USOPTL4_4)},
180 {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USOPTL4_2)},
181 {} /* terminating entry */
182 };
183
184 MODULE_DEVICE_TABLE(usb, moschip_id_table_combined);
185
186 /* This structure holds all of the local port information */
187
188 struct moschip_port {
189 int port_num; /*Actual port number in the device(1,2,etc) */
190 struct urb *write_urb; /* write URB for this port */
191 struct urb *read_urb; /* read URB for this port */
192 struct urb *int_urb;
193 __u8 shadowLCR; /* last LCR value received */
194 __u8 shadowMCR; /* last MCR value received */
195 char open;
196 char open_ports;
197 char zombie;
198 wait_queue_head_t wait_chase; /* for handling sleeping while waiting for chase to finish */
199 wait_queue_head_t delta_msr_wait; /* for handling sleeping while waiting for msr change to happen */
200 int delta_msr_cond;
201 struct async_icount icount;
202 struct usb_serial_port *port; /* loop back to the owner of this object */
203
204 /*Offsets */
205 __u8 SpRegOffset;
206 __u8 ControlRegOffset;
207 __u8 DcrRegOffset;
208 //for processing control URBS in interrupt context
209 struct urb *control_urb;
210 struct usb_ctrlrequest *dr;
211 char *ctrl_buf;
212 int MsrLsr;
213
214 spinlock_t pool_lock;
215 struct urb *write_urb_pool[NUM_URBS];
216 char busy[NUM_URBS];
217 };
218
219
220 static int debug;
221
222 /*
223 * mos7840_set_reg_sync
224 * To set the Control register by calling usb_fill_control_urb function
225 * by passing usb_sndctrlpipe function as parameter.
226 */
227
228 static int mos7840_set_reg_sync(struct usb_serial_port *port, __u16 reg,
229 __u16 val)
230 {
231 struct usb_device *dev = port->serial->dev;
232 val = val & 0x00ff;
233 dbg("mos7840_set_reg_sync offset is %x, value %x\n", reg, val);
234
235 return usb_control_msg(dev, usb_sndctrlpipe(dev, 0), MCS_WRREQ,
236 MCS_WR_RTYPE, val, reg, NULL, 0,
237 MOS_WDR_TIMEOUT);
238 }
239
240 /*
241 * mos7840_get_reg_sync
242 * To set the Uart register by calling usb_fill_control_urb function by
243 * passing usb_rcvctrlpipe function as parameter.
244 */
245
246 static int mos7840_get_reg_sync(struct usb_serial_port *port, __u16 reg,
247 __u16 * val)
248 {
249 struct usb_device *dev = port->serial->dev;
250 int ret = 0;
251
252 ret = usb_control_msg(dev, usb_rcvctrlpipe(dev, 0), MCS_RDREQ,
253 MCS_RD_RTYPE, 0, reg, val, VENDOR_READ_LENGTH,
254 MOS_WDR_TIMEOUT);
255 dbg("mos7840_get_reg_sync offset is %x, return val %x\n", reg, *val);
256 *val = (*val) & 0x00ff;
257 return ret;
258 }
259
260 /*
261 * mos7840_set_uart_reg
262 * To set the Uart register by calling usb_fill_control_urb function by
263 * passing usb_sndctrlpipe function as parameter.
264 */
265
266 static int mos7840_set_uart_reg(struct usb_serial_port *port, __u16 reg,
267 __u16 val)
268 {
269
270 struct usb_device *dev = port->serial->dev;
271 val = val & 0x00ff;
272 // For the UART control registers, the application number need to be Or'ed
273 if (port->serial->num_ports == 4) {
274 val |=
275 (((__u16) port->number - (__u16) (port->serial->minor)) +
276 1) << 8;
277 dbg("mos7840_set_uart_reg application number is %x\n", val);
278 } else {
279 if (((__u16) port->number - (__u16) (port->serial->minor)) == 0) {
280 val |=
281 (((__u16) port->number -
282 (__u16) (port->serial->minor)) + 1) << 8;
283 dbg("mos7840_set_uart_reg application number is %x\n",
284 val);
285 } else {
286 val |=
287 (((__u16) port->number -
288 (__u16) (port->serial->minor)) + 2) << 8;
289 dbg("mos7840_set_uart_reg application number is %x\n",
290 val);
291 }
292 }
293 return usb_control_msg(dev, usb_sndctrlpipe(dev, 0), MCS_WRREQ,
294 MCS_WR_RTYPE, val, reg, NULL, 0,
295 MOS_WDR_TIMEOUT);
296
297 }
298
299 /*
300 * mos7840_get_uart_reg
301 * To set the Control register by calling usb_fill_control_urb function
302 * by passing usb_rcvctrlpipe function as parameter.
303 */
304 static int mos7840_get_uart_reg(struct usb_serial_port *port, __u16 reg,
305 __u16 * val)
306 {
307 struct usb_device *dev = port->serial->dev;
308 int ret = 0;
309 __u16 Wval;
310
311 //dbg("application number is %4x \n",(((__u16)port->number - (__u16)(port->serial->minor))+1)<<8);
312 /*Wval is same as application number */
313 if (port->serial->num_ports == 4) {
314 Wval =
315 (((__u16) port->number - (__u16) (port->serial->minor)) +
316 1) << 8;
317 dbg("mos7840_get_uart_reg application number is %x\n", Wval);
318 } else {
319 if (((__u16) port->number - (__u16) (port->serial->minor)) == 0) {
320 Wval =
321 (((__u16) port->number -
322 (__u16) (port->serial->minor)) + 1) << 8;
323 dbg("mos7840_get_uart_reg application number is %x\n",
324 Wval);
325 } else {
326 Wval =
327 (((__u16) port->number -
328 (__u16) (port->serial->minor)) + 2) << 8;
329 dbg("mos7840_get_uart_reg application number is %x\n",
330 Wval);
331 }
332 }
333 ret = usb_control_msg(dev, usb_rcvctrlpipe(dev, 0), MCS_RDREQ,
334 MCS_RD_RTYPE, Wval, reg, val, VENDOR_READ_LENGTH,
335 MOS_WDR_TIMEOUT);
336 *val = (*val) & 0x00ff;
337 return ret;
338 }
339
340 static void mos7840_dump_serial_port(struct moschip_port *mos7840_port)
341 {
342
343 dbg("***************************************\n");
344 dbg("SpRegOffset is %2x\n", mos7840_port->SpRegOffset);
345 dbg("ControlRegOffset is %2x \n", mos7840_port->ControlRegOffset);
346 dbg("DCRRegOffset is %2x \n", mos7840_port->DcrRegOffset);
347 dbg("***************************************\n");
348
349 }
350
351 /************************************************************************/
352 /************************************************************************/
353 /* I N T E R F A C E F U N C T I O N S */
354 /* I N T E R F A C E F U N C T I O N S */
355 /************************************************************************/
356 /************************************************************************/
357
358 static inline void mos7840_set_port_private(struct usb_serial_port *port,
359 struct moschip_port *data)
360 {
361 usb_set_serial_port_data(port, (void *)data);
362 }
363
364 static inline struct moschip_port *mos7840_get_port_private(struct
365 usb_serial_port
366 *port)
367 {
368 return (struct moschip_port *)usb_get_serial_port_data(port);
369 }
370
371 static void mos7840_handle_new_msr(struct moschip_port *port, __u8 new_msr)
372 {
373 struct moschip_port *mos7840_port;
374 struct async_icount *icount;
375 mos7840_port = port;
376 icount = &mos7840_port->icount;
377 if (new_msr &
378 (MOS_MSR_DELTA_CTS | MOS_MSR_DELTA_DSR | MOS_MSR_DELTA_RI |
379 MOS_MSR_DELTA_CD)) {
380 icount = &mos7840_port->icount;
381
382 /* update input line counters */
383 if (new_msr & MOS_MSR_DELTA_CTS) {
384 icount->cts++;
385 smp_wmb();
386 }
387 if (new_msr & MOS_MSR_DELTA_DSR) {
388 icount->dsr++;
389 smp_wmb();
390 }
391 if (new_msr & MOS_MSR_DELTA_CD) {
392 icount->dcd++;
393 smp_wmb();
394 }
395 if (new_msr & MOS_MSR_DELTA_RI) {
396 icount->rng++;
397 smp_wmb();
398 }
399 }
400 }
401
402 static void mos7840_handle_new_lsr(struct moschip_port *port, __u8 new_lsr)
403 {
404 struct async_icount *icount;
405
406 dbg("%s - %02x", __func__, new_lsr);
407
408 if (new_lsr & SERIAL_LSR_BI) {
409 //
410 // Parity and Framing errors only count if they
411 // occur exclusive of a break being
412 // received.
413 //
414 new_lsr &= (__u8) (SERIAL_LSR_OE | SERIAL_LSR_BI);
415 }
416
417 /* update input line counters */
418 icount = &port->icount;
419 if (new_lsr & SERIAL_LSR_BI) {
420 icount->brk++;
421 smp_wmb();
422 }
423 if (new_lsr & SERIAL_LSR_OE) {
424 icount->overrun++;
425 smp_wmb();
426 }
427 if (new_lsr & SERIAL_LSR_PE) {
428 icount->parity++;
429 smp_wmb();
430 }
431 if (new_lsr & SERIAL_LSR_FE) {
432 icount->frame++;
433 smp_wmb();
434 }
435 }
436
437 /************************************************************************/
438 /************************************************************************/
439 /* U S B C A L L B A C K F U N C T I O N S */
440 /* U S B C A L L B A C K F U N C T I O N S */
441 /************************************************************************/
442 /************************************************************************/
443
444 static void mos7840_control_callback(struct urb *urb)
445 {
446 unsigned char *data;
447 struct moschip_port *mos7840_port;
448 __u8 regval = 0x0;
449 int result = 0;
450 int status = urb->status;
451
452 mos7840_port = urb->context;
453
454 switch (status) {
455 case 0:
456 /* success */
457 break;
458 case -ECONNRESET:
459 case -ENOENT:
460 case -ESHUTDOWN:
461 /* this urb is terminated, clean up */
462 dbg("%s - urb shutting down with status: %d", __func__,
463 status);
464 return;
465 default:
466 dbg("%s - nonzero urb status received: %d", __func__,
467 status);
468 goto exit;
469 }
470
471 dbg("%s urb buffer size is %d\n", __func__, urb->actual_length);
472 dbg("%s mos7840_port->MsrLsr is %d port %d\n", __func__,
473 mos7840_port->MsrLsr, mos7840_port->port_num);
474 data = urb->transfer_buffer;
475 regval = (__u8) data[0];
476 dbg("%s data is %x\n", __func__, regval);
477 if (mos7840_port->MsrLsr == 0)
478 mos7840_handle_new_msr(mos7840_port, regval);
479 else if (mos7840_port->MsrLsr == 1)
480 mos7840_handle_new_lsr(mos7840_port, regval);
481
482 exit:
483 spin_lock(&mos7840_port->pool_lock);
484 if (!mos7840_port->zombie)
485 result = usb_submit_urb(mos7840_port->int_urb, GFP_ATOMIC);
486 spin_unlock(&mos7840_port->pool_lock);
487 if (result) {
488 dev_err(&urb->dev->dev,
489 "%s - Error %d submitting interrupt urb\n",
490 __func__, result);
491 }
492 }
493
494 static int mos7840_get_reg(struct moschip_port *mcs, __u16 Wval, __u16 reg,
495 __u16 * val)
496 {
497 struct usb_device *dev = mcs->port->serial->dev;
498 struct usb_ctrlrequest *dr = mcs->dr;
499 unsigned char *buffer = mcs->ctrl_buf;
500 int ret;
501
502 dr->bRequestType = MCS_RD_RTYPE;
503 dr->bRequest = MCS_RDREQ;
504 dr->wValue = cpu_to_le16(Wval); //0;
505 dr->wIndex = cpu_to_le16(reg);
506 dr->wLength = cpu_to_le16(2);
507
508 usb_fill_control_urb(mcs->control_urb, dev, usb_rcvctrlpipe(dev, 0),
509 (unsigned char *)dr, buffer, 2,
510 mos7840_control_callback, mcs);
511 mcs->control_urb->transfer_buffer_length = 2;
512 ret = usb_submit_urb(mcs->control_urb, GFP_ATOMIC);
513 return ret;
514 }
515
516 /*****************************************************************************
517 * mos7840_interrupt_callback
518 * this is the callback function for when we have received data on the
519 * interrupt endpoint.
520 *****************************************************************************/
521
522 static void mos7840_interrupt_callback(struct urb *urb)
523 {
524 int result;
525 int length;
526 struct moschip_port *mos7840_port;
527 struct usb_serial *serial;
528 __u16 Data;
529 unsigned char *data;
530 __u8 sp[5], st;
531 int i, rv = 0;
532 __u16 wval, wreg = 0;
533 int status = urb->status;
534
535 dbg("%s", " : Entering\n");
536
537 switch (status) {
538 case 0:
539 /* success */
540 break;
541 case -ECONNRESET:
542 case -ENOENT:
543 case -ESHUTDOWN:
544 /* this urb is terminated, clean up */
545 dbg("%s - urb shutting down with status: %d", __func__,
546 status);
547 return;
548 default:
549 dbg("%s - nonzero urb status received: %d", __func__,
550 status);
551 goto exit;
552 }
553
554 length = urb->actual_length;
555 data = urb->transfer_buffer;
556
557 serial = urb->context;
558
559 /* Moschip get 5 bytes
560 * Byte 1 IIR Port 1 (port.number is 0)
561 * Byte 2 IIR Port 2 (port.number is 1)
562 * Byte 3 IIR Port 3 (port.number is 2)
563 * Byte 4 IIR Port 4 (port.number is 3)
564 * Byte 5 FIFO status for both */
565
566 if (length && length > 5) {
567 dbg("%s \n", "Wrong data !!!");
568 return;
569 }
570
571 sp[0] = (__u8) data[0];
572 sp[1] = (__u8) data[1];
573 sp[2] = (__u8) data[2];
574 sp[3] = (__u8) data[3];
575 st = (__u8) data[4];
576
577 for (i = 0; i < serial->num_ports; i++) {
578 mos7840_port = mos7840_get_port_private(serial->port[i]);
579 wval =
580 (((__u16) serial->port[i]->number -
581 (__u16) (serial->minor)) + 1) << 8;
582 if (mos7840_port->open) {
583 if (sp[i] & 0x01) {
584 dbg("SP%d No Interrupt !!!\n", i);
585 } else {
586 switch (sp[i] & 0x0f) {
587 case SERIAL_IIR_RLS:
588 dbg("Serial Port %d: Receiver status error or ", i);
589 dbg("address bit detected in 9-bit mode\n");
590 mos7840_port->MsrLsr = 1;
591 wreg = LINE_STATUS_REGISTER;
592 break;
593 case SERIAL_IIR_MS:
594 dbg("Serial Port %d: Modem status change\n", i);
595 mos7840_port->MsrLsr = 0;
596 wreg = MODEM_STATUS_REGISTER;
597 break;
598 }
599 spin_lock(&mos7840_port->pool_lock);
600 if (!mos7840_port->zombie) {
601 rv = mos7840_get_reg(mos7840_port, wval, wreg, &Data);
602 } else {
603 spin_unlock(&mos7840_port->pool_lock);
604 return;
605 }
606 spin_unlock(&mos7840_port->pool_lock);
607 }
608 }
609 }
610 if (!(rv < 0)) /* the completion handler for the control urb will resubmit */
611 return;
612 exit:
613 result = usb_submit_urb(urb, GFP_ATOMIC);
614 if (result) {
615 dev_err(&urb->dev->dev,
616 "%s - Error %d submitting interrupt urb\n",
617 __func__, result);
618 }
619 }
620
621 static int mos7840_port_paranoia_check(struct usb_serial_port *port,
622 const char *function)
623 {
624 if (!port) {
625 dbg("%s - port == NULL", function);
626 return -1;
627 }
628 if (!port->serial) {
629 dbg("%s - port->serial == NULL", function);
630 return -1;
631 }
632
633 return 0;
634 }
635
636 /* Inline functions to check the sanity of a pointer that is passed to us */
637 static int mos7840_serial_paranoia_check(struct usb_serial *serial,
638 const char *function)
639 {
640 if (!serial) {
641 dbg("%s - serial == NULL", function);
642 return -1;
643 }
644 if (!serial->type) {
645 dbg("%s - serial->type == NULL!", function);
646 return -1;
647 }
648
649 return 0;
650 }
651
652 static struct usb_serial *mos7840_get_usb_serial(struct usb_serial_port *port,
653 const char *function)
654 {
655 /* if no port was specified, or it fails a paranoia check */
656 if (!port ||
657 mos7840_port_paranoia_check(port, function) ||
658 mos7840_serial_paranoia_check(port->serial, function)) {
659 /* then say that we don't have a valid usb_serial thing, which will
660 * end up genrating -ENODEV return values */
661 return NULL;
662 }
663
664 return port->serial;
665 }
666
667 /*****************************************************************************
668 * mos7840_bulk_in_callback
669 * this is the callback function for when we have received data on the
670 * bulk in endpoint.
671 *****************************************************************************/
672
673 static void mos7840_bulk_in_callback(struct urb *urb)
674 {
675 int retval;
676 unsigned char *data;
677 struct usb_serial *serial;
678 struct usb_serial_port *port;
679 struct moschip_port *mos7840_port;
680 struct tty_struct *tty;
681 int status = urb->status;
682
683 if (status) {
684 dbg("nonzero read bulk status received: %d", status);
685 return;
686 }
687
688 mos7840_port = urb->context;
689 if (!mos7840_port) {
690 dbg("%s", "NULL mos7840_port pointer \n");
691 return;
692 }
693
694 port = (struct usb_serial_port *)mos7840_port->port;
695 if (mos7840_port_paranoia_check(port, __func__)) {
696 dbg("%s", "Port Paranoia failed \n");
697 return;
698 }
699
700 serial = mos7840_get_usb_serial(port, __func__);
701 if (!serial) {
702 dbg("%s\n", "Bad serial pointer ");
703 return;
704 }
705
706 dbg("%s\n", "Entering... \n");
707
708 data = urb->transfer_buffer;
709
710 dbg("%s", "Entering ........... \n");
711
712 if (urb->actual_length) {
713 tty = mos7840_port->port->tty;
714 if (tty) {
715 tty_buffer_request_room(tty, urb->actual_length);
716 tty_insert_flip_string(tty, data, urb->actual_length);
717 dbg(" %s \n", data);
718 tty_flip_buffer_push(tty);
719 }
720 mos7840_port->icount.rx += urb->actual_length;
721 smp_wmb();
722 dbg("mos7840_port->icount.rx is %d:\n",
723 mos7840_port->icount.rx);
724 }
725
726 if (!mos7840_port->read_urb) {
727 dbg("%s", "URB KILLED !!!\n");
728 return;
729 }
730
731
732 mos7840_port->read_urb->dev = serial->dev;
733
734 retval = usb_submit_urb(mos7840_port->read_urb, GFP_ATOMIC);
735
736 if (retval) {
737 dbg(" usb_submit_urb(read bulk) failed, retval = %d",
738 retval);
739 }
740 }
741
742 /*****************************************************************************
743 * mos7840_bulk_out_data_callback
744 * this is the callback function for when we have finished sending serial data
745 * on the bulk out endpoint.
746 *****************************************************************************/
747
748 static void mos7840_bulk_out_data_callback(struct urb *urb)
749 {
750 struct moschip_port *mos7840_port;
751 struct tty_struct *tty;
752 int status = urb->status;
753 int i;
754
755 mos7840_port = urb->context;
756 spin_lock(&mos7840_port->pool_lock);
757 for (i = 0; i < NUM_URBS; i++) {
758 if (urb == mos7840_port->write_urb_pool[i]) {
759 mos7840_port->busy[i] = 0;
760 break;
761 }
762 }
763 spin_unlock(&mos7840_port->pool_lock);
764
765 if (status) {
766 dbg("nonzero write bulk status received:%d\n", status);
767 return;
768 }
769
770 if (mos7840_port_paranoia_check(mos7840_port->port, __func__)) {
771 dbg("%s", "Port Paranoia failed \n");
772 return;
773 }
774
775 dbg("%s \n", "Entering .........");
776
777 tty = mos7840_port->port->tty;
778
779 if (tty && mos7840_port->open)
780 tty_wakeup(tty);
781
782 }
783
784 /************************************************************************/
785 /* 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 */
786 /************************************************************************/
787 #ifdef MCSSerialProbe
788 static int mos7840_serial_probe(struct usb_serial *serial,
789 const struct usb_device_id *id)
790 {
791
792 /*need to implement the mode_reg reading and updating\
793 structures usb_serial_ device_type\
794 (i.e num_ports, num_bulkin,bulkout etc) */
795 /* Also we can update the changes attach */
796 return 1;
797 }
798 #endif
799
800 /*****************************************************************************
801 * mos7840_open
802 * this function is called by the tty driver when a port is opened
803 * If successful, we return 0
804 * Otherwise we return a negative error number.
805 *****************************************************************************/
806
807 static int mos7840_open(struct usb_serial_port *port, struct file *filp)
808 {
809 int response;
810 int j;
811 struct usb_serial *serial;
812 struct urb *urb;
813 __u16 Data;
814 int status;
815 struct moschip_port *mos7840_port;
816 struct moschip_port *port0;
817
818 if (mos7840_port_paranoia_check(port, __func__)) {
819 dbg("%s", "Port Paranoia failed \n");
820 return -ENODEV;
821 }
822
823 serial = port->serial;
824
825 if (mos7840_serial_paranoia_check(serial, __func__)) {
826 dbg("%s", "Serial Paranoia failed \n");
827 return -ENODEV;
828 }
829
830 mos7840_port = mos7840_get_port_private(port);
831 port0 = mos7840_get_port_private(serial->port[0]);
832
833 if (mos7840_port == NULL || port0 == NULL)
834 return -ENODEV;
835
836 usb_clear_halt(serial->dev, port->write_urb->pipe);
837 usb_clear_halt(serial->dev, port->read_urb->pipe);
838 port0->open_ports++;
839
840 /* Initialising the write urb pool */
841 for (j = 0; j < NUM_URBS; ++j) {
842 urb = usb_alloc_urb(0, GFP_KERNEL);
843 mos7840_port->write_urb_pool[j] = urb;
844
845 if (urb == NULL) {
846 err("No more urbs???");
847 continue;
848 }
849
850 urb->transfer_buffer = kmalloc(URB_TRANSFER_BUFFER_SIZE, GFP_KERNEL);
851 if (!urb->transfer_buffer) {
852 usb_free_urb(urb);
853 mos7840_port->write_urb_pool[j] = NULL;
854 err("%s-out of memory for urb buffers.", __func__);
855 continue;
856 }
857 }
858
859 /*****************************************************************************
860 * Initialize MCS7840 -- Write Init values to corresponding Registers
861 *
862 * Register Index
863 * 1 : IER
864 * 2 : FCR
865 * 3 : LCR
866 * 4 : MCR
867 *
868 * 0x08 : SP1/2 Control Reg
869 *****************************************************************************/
870
871 //NEED to check the following Block
872
873 status = 0;
874 Data = 0x0;
875 status = mos7840_get_reg_sync(port, mos7840_port->SpRegOffset, &Data);
876 if (status < 0) {
877 dbg("Reading Spreg failed\n");
878 return -1;
879 }
880 Data |= 0x80;
881 status = mos7840_set_reg_sync(port, mos7840_port->SpRegOffset, Data);
882 if (status < 0) {
883 dbg("writing Spreg failed\n");
884 return -1;
885 }
886
887 Data &= ~0x80;
888 status = mos7840_set_reg_sync(port, mos7840_port->SpRegOffset, Data);
889 if (status < 0) {
890 dbg("writing Spreg failed\n");
891 return -1;
892 }
893 //End of block to be checked
894
895 status = 0;
896 Data = 0x0;
897 status =
898 mos7840_get_reg_sync(port, mos7840_port->ControlRegOffset, &Data);
899 if (status < 0) {
900 dbg("Reading Controlreg failed\n");
901 return -1;
902 }
903 Data |= 0x08; //Driver done bit
904 Data |= 0x20; //rx_disable
905 status = mos7840_set_reg_sync(port, mos7840_port->ControlRegOffset, Data);
906 if (status < 0) {
907 dbg("writing Controlreg failed\n");
908 return -1;
909 }
910 //do register settings here
911 // Set all regs to the device default values.
912 ////////////////////////////////////
913 // First Disable all interrupts.
914 ////////////////////////////////////
915
916 Data = 0x00;
917 status = mos7840_set_uart_reg(port, INTERRUPT_ENABLE_REGISTER, Data);
918 if (status < 0) {
919 dbg("disableing interrupts failed\n");
920 return -1;
921 }
922 // Set FIFO_CONTROL_REGISTER to the default value
923 Data = 0x00;
924 status = mos7840_set_uart_reg(port, FIFO_CONTROL_REGISTER, Data);
925 if (status < 0) {
926 dbg("Writing FIFO_CONTROL_REGISTER failed\n");
927 return -1;
928 }
929
930 Data = 0xcf;
931 status = mos7840_set_uart_reg(port, FIFO_CONTROL_REGISTER, Data);
932 if (status < 0) {
933 dbg("Writing FIFO_CONTROL_REGISTER failed\n");
934 return -1;
935 }
936
937 Data = 0x03;
938 status = mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data);
939 mos7840_port->shadowLCR = Data;
940
941 Data = 0x0b;
942 status = mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER, Data);
943 mos7840_port->shadowMCR = Data;
944
945 Data = 0x00;
946 status = mos7840_get_uart_reg(port, LINE_CONTROL_REGISTER, &Data);
947 mos7840_port->shadowLCR = Data;
948
949 Data |= SERIAL_LCR_DLAB; //data latch enable in LCR 0x80
950 status = mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data);
951
952 Data = 0x0c;
953 status = 0;
954 status = mos7840_set_uart_reg(port, DIVISOR_LATCH_LSB, Data);
955
956 Data = 0x0;
957 status = 0;
958 status = mos7840_set_uart_reg(port, DIVISOR_LATCH_MSB, Data);
959
960 Data = 0x00;
961 status = 0;
962 status = mos7840_get_uart_reg(port, LINE_CONTROL_REGISTER, &Data);
963
964 Data = Data & ~SERIAL_LCR_DLAB;
965 status = 0;
966 status = mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data);
967 mos7840_port->shadowLCR = Data;
968
969 //clearing Bulkin and Bulkout Fifo
970 Data = 0x0;
971 status = 0;
972 status = mos7840_get_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
978 Data = Data & ~0x0c;
979 status = 0;
980 status = mos7840_set_reg_sync(port, mos7840_port->SpRegOffset, Data);
981 //Finally enable all interrupts
982 Data = 0x0;
983 Data = 0x0c;
984 status = 0;
985 status = mos7840_set_uart_reg(port, INTERRUPT_ENABLE_REGISTER, Data);
986
987 //clearing rx_disable
988 Data = 0x0;
989 status = 0;
990 status =
991 mos7840_get_reg_sync(port, mos7840_port->ControlRegOffset, &Data);
992 Data = Data & ~0x20;
993 status = 0;
994 status =
995 mos7840_set_reg_sync(port, mos7840_port->ControlRegOffset, Data);
996
997 // rx_negate
998 Data = 0x0;
999 status = 0;
1000 status =
1001 mos7840_get_reg_sync(port, mos7840_port->ControlRegOffset, &Data);
1002 Data = Data | 0x10;
1003 status = 0;
1004 status =
1005 mos7840_set_reg_sync(port, mos7840_port->ControlRegOffset, Data);
1006
1007 /* force low_latency on so that our tty_push actually forces *
1008 * the data through,otherwise it is scheduled, and with *
1009 * high data rates (like with OHCI) data can get lost. */
1010
1011 if (port->tty)
1012 port->tty->low_latency = 1;
1013 /* Check to see if we've set up our endpoint info yet *
1014 * (can't set it up in mos7840_startup as the structures *
1015 * were not set up at that time.) */
1016 if (port0->open_ports == 1) {
1017 if (serial->port[0]->interrupt_in_buffer == NULL) {
1018
1019 /* set up interrupt urb */
1020
1021 usb_fill_int_urb(serial->port[0]->interrupt_in_urb,
1022 serial->dev,
1023 usb_rcvintpipe(serial->dev,
1024 serial->port[0]->
1025 interrupt_in_endpointAddress),
1026 serial->port[0]->interrupt_in_buffer,
1027 serial->port[0]->interrupt_in_urb->
1028 transfer_buffer_length,
1029 mos7840_interrupt_callback,
1030 serial,
1031 serial->port[0]->interrupt_in_urb->
1032 interval);
1033
1034 /* start interrupt read for mos7840 *
1035 * will continue as long as mos7840 is connected */
1036
1037 response =
1038 usb_submit_urb(serial->port[0]->interrupt_in_urb,
1039 GFP_KERNEL);
1040 if (response) {
1041 err("%s - Error %d submitting interrupt urb",
1042 __func__, response);
1043 }
1044
1045 }
1046
1047 }
1048
1049 /* see if we've set up our endpoint info yet *
1050 * (can't set it up in mos7840_startup as the *
1051 * structures were not set up at that time.) */
1052
1053 dbg("port number is %d \n", port->number);
1054 dbg("serial number is %d \n", port->serial->minor);
1055 dbg("Bulkin endpoint is %d \n", port->bulk_in_endpointAddress);
1056 dbg("BulkOut endpoint is %d \n", port->bulk_out_endpointAddress);
1057 dbg("Interrupt endpoint is %d \n", port->interrupt_in_endpointAddress);
1058 dbg("port's number in the device is %d\n", mos7840_port->port_num);
1059 mos7840_port->read_urb = port->read_urb;
1060
1061 /* set up our bulk in urb */
1062
1063 usb_fill_bulk_urb(mos7840_port->read_urb,
1064 serial->dev,
1065 usb_rcvbulkpipe(serial->dev,
1066 port->bulk_in_endpointAddress),
1067 port->bulk_in_buffer,
1068 mos7840_port->read_urb->transfer_buffer_length,
1069 mos7840_bulk_in_callback, mos7840_port);
1070
1071 dbg("mos7840_open: bulkin endpoint is %d\n",
1072 port->bulk_in_endpointAddress);
1073 response = usb_submit_urb(mos7840_port->read_urb, GFP_KERNEL);
1074 if (response) {
1075 err("%s - Error %d submitting control urb", __func__,
1076 response);
1077 }
1078
1079 /* initialize our wait queues */
1080 init_waitqueue_head(&mos7840_port->wait_chase);
1081 init_waitqueue_head(&mos7840_port->delta_msr_wait);
1082
1083 /* initialize our icount structure */
1084 memset(&(mos7840_port->icount), 0x00, sizeof(mos7840_port->icount));
1085
1086 /* initialize our port settings */
1087 mos7840_port->shadowMCR = MCR_MASTER_IE; /* Must set to enable ints! */
1088 /* send a open port command */
1089 mos7840_port->open = 1;
1090 //mos7840_change_port_settings(mos7840_port,old_termios);
1091 mos7840_port->icount.tx = 0;
1092 mos7840_port->icount.rx = 0;
1093
1094 dbg("\n\nusb_serial serial:%p mos7840_port:%p\n usb_serial_port port:%p\n\n", serial, mos7840_port, port);
1095
1096 return 0;
1097
1098 }
1099
1100 /*****************************************************************************
1101 * mos7840_chars_in_buffer
1102 * this function is called by the tty driver when it wants to know how many
1103 * bytes of data we currently have outstanding in the port (data that has
1104 * been written, but hasn't made it out the port yet)
1105 * If successful, we return the number of bytes left to be written in the
1106 * system,
1107 * Otherwise we return a negative error number.
1108 *****************************************************************************/
1109
1110 static int mos7840_chars_in_buffer(struct usb_serial_port *port)
1111 {
1112 int i;
1113 int chars = 0;
1114 unsigned long flags;
1115 struct moschip_port *mos7840_port;
1116
1117 dbg("%s \n", " mos7840_chars_in_buffer:entering ...........");
1118
1119 if (mos7840_port_paranoia_check(port, __func__)) {
1120 dbg("%s", "Invalid port \n");
1121 return -1;
1122 }
1123
1124 mos7840_port = mos7840_get_port_private(port);
1125 if (mos7840_port == NULL) {
1126 dbg("%s \n", "mos7840_break:leaving ...........");
1127 return -1;
1128 }
1129
1130 spin_lock_irqsave(&mos7840_port->pool_lock,flags);
1131 for (i = 0; i < NUM_URBS; ++i) {
1132 if (mos7840_port->busy[i]) {
1133 chars += URB_TRANSFER_BUFFER_SIZE;
1134 }
1135 }
1136 spin_unlock_irqrestore(&mos7840_port->pool_lock,flags);
1137 dbg("%s - returns %d", __func__, chars);
1138 return chars;
1139
1140 }
1141
1142 /************************************************************************
1143 *
1144 * mos7840_block_until_tx_empty
1145 *
1146 * This function will block the close until one of the following:
1147 * 1. TX count are 0
1148 * 2. The mos7840 has stopped
1149 * 3. A timeout of 3 seconds without activity has expired
1150 *
1151 ************************************************************************/
1152 static void mos7840_block_until_tx_empty(struct moschip_port *mos7840_port)
1153 {
1154 int timeout = HZ / 10;
1155 int wait = 30;
1156 int count;
1157
1158 while (1) {
1159
1160 count = mos7840_chars_in_buffer(mos7840_port->port);
1161
1162 /* Check for Buffer status */
1163 if (count <= 0) {
1164 return;
1165 }
1166
1167 /* Block the thread for a while */
1168 interruptible_sleep_on_timeout(&mos7840_port->wait_chase,
1169 timeout);
1170
1171 /* No activity.. count down section */
1172 wait--;
1173 if (wait == 0) {
1174 dbg("%s - TIMEOUT", __func__);
1175 return;
1176 } else {
1177 /* Reset timeout value back to seconds */
1178 wait = 30;
1179 }
1180 }
1181 }
1182
1183 /*****************************************************************************
1184 * mos7840_close
1185 * this function is called by the tty driver when a port is closed
1186 *****************************************************************************/
1187
1188 static void mos7840_close(struct usb_serial_port *port, struct file *filp)
1189 {
1190 struct usb_serial *serial;
1191 struct moschip_port *mos7840_port;
1192 struct moschip_port *port0;
1193 int j;
1194 __u16 Data;
1195
1196 dbg("%s\n", "mos7840_close:entering...");
1197
1198 if (mos7840_port_paranoia_check(port, __func__)) {
1199 dbg("%s", "Port Paranoia failed \n");
1200 return;
1201 }
1202
1203 serial = mos7840_get_usb_serial(port, __func__);
1204 if (!serial) {
1205 dbg("%s", "Serial Paranoia failed \n");
1206 return;
1207 }
1208
1209 mos7840_port = mos7840_get_port_private(port);
1210 port0 = mos7840_get_port_private(serial->port[0]);
1211
1212 if (mos7840_port == NULL || port0 == NULL)
1213 return;
1214
1215 for (j = 0; j < NUM_URBS; ++j)
1216 usb_kill_urb(mos7840_port->write_urb_pool[j]);
1217
1218 /* Freeing Write URBs */
1219 for (j = 0; j < NUM_URBS; ++j) {
1220 if (mos7840_port->write_urb_pool[j]) {
1221 if (mos7840_port->write_urb_pool[j]->transfer_buffer)
1222 kfree(mos7840_port->write_urb_pool[j]->
1223 transfer_buffer);
1224
1225 usb_free_urb(mos7840_port->write_urb_pool[j]);
1226 }
1227 }
1228
1229 if (serial->dev) {
1230 /* flush and block until tx is empty */
1231 mos7840_block_until_tx_empty(mos7840_port);
1232 }
1233
1234 /* While closing port, shutdown all bulk read, write *
1235 * and interrupt read if they exists */
1236 if (serial->dev) {
1237
1238 if (mos7840_port->write_urb) {
1239 dbg("%s", "Shutdown bulk write\n");
1240 usb_kill_urb(mos7840_port->write_urb);
1241 }
1242
1243 if (mos7840_port->read_urb) {
1244 dbg("%s", "Shutdown bulk read\n");
1245 usb_kill_urb(mos7840_port->read_urb);
1246 }
1247 if ((&mos7840_port->control_urb)) {
1248 dbg("%s", "Shutdown control read\n");
1249 // usb_kill_urb (mos7840_port->control_urb);
1250
1251 }
1252 }
1253 // if(mos7840_port->ctrl_buf != NULL)
1254 // kfree(mos7840_port->ctrl_buf);
1255 port0->open_ports--;
1256 dbg("mos7840_num_open_ports in close%d:in port%d\n",
1257 port0->open_ports, port->number);
1258 if (port0->open_ports == 0) {
1259 if (serial->port[0]->interrupt_in_urb) {
1260 dbg("%s", "Shutdown interrupt_in_urb\n");
1261 usb_kill_urb(serial->port[0]->interrupt_in_urb);
1262 }
1263 }
1264
1265 if (mos7840_port->write_urb) {
1266 /* if this urb had a transfer buffer already (old tx) free it */
1267
1268 if (mos7840_port->write_urb->transfer_buffer != NULL) {
1269 kfree(mos7840_port->write_urb->transfer_buffer);
1270 }
1271 usb_free_urb(mos7840_port->write_urb);
1272 }
1273
1274 Data = 0x0;
1275 mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER, Data);
1276
1277 Data = 0x00;
1278 mos7840_set_uart_reg(port, INTERRUPT_ENABLE_REGISTER, Data);
1279
1280 mos7840_port->open = 0;
1281
1282 dbg("%s \n", "Leaving ............");
1283 }
1284
1285 /************************************************************************
1286 *
1287 * mos7840_block_until_chase_response
1288 *
1289 * This function will block the close until one of the following:
1290 * 1. Response to our Chase comes from mos7840
1291 * 2. A timeout of 10 seconds without activity has expired
1292 * (1K of mos7840 data @ 2400 baud ==> 4 sec to empty)
1293 *
1294 ************************************************************************/
1295
1296 static void mos7840_block_until_chase_response(struct moschip_port
1297 *mos7840_port)
1298 {
1299 int timeout = 1 * HZ;
1300 int wait = 10;
1301 int count;
1302
1303 while (1) {
1304 count = mos7840_chars_in_buffer(mos7840_port->port);
1305
1306 /* Check for Buffer status */
1307 if (count <= 0) {
1308 return;
1309 }
1310
1311 /* Block the thread for a while */
1312 interruptible_sleep_on_timeout(&mos7840_port->wait_chase,
1313 timeout);
1314 /* No activity.. count down section */
1315 wait--;
1316 if (wait == 0) {
1317 dbg("%s - TIMEOUT", __func__);
1318 return;
1319 } else {
1320 /* Reset timeout value back to seconds */
1321 wait = 10;
1322 }
1323 }
1324
1325 }
1326
1327 /*****************************************************************************
1328 * mos7840_break
1329 * this function sends a break to the port
1330 *****************************************************************************/
1331 static void mos7840_break(struct usb_serial_port *port, int break_state)
1332 {
1333 unsigned char data;
1334 struct usb_serial *serial;
1335 struct moschip_port *mos7840_port;
1336
1337 dbg("%s \n", "Entering ...........");
1338 dbg("mos7840_break: Start\n");
1339
1340 if (mos7840_port_paranoia_check(port, __func__)) {
1341 dbg("%s", "Port Paranoia failed \n");
1342 return;
1343 }
1344
1345 serial = mos7840_get_usb_serial(port, __func__);
1346 if (!serial) {
1347 dbg("%s", "Serial Paranoia failed \n");
1348 return;
1349 }
1350
1351 mos7840_port = mos7840_get_port_private(port);
1352
1353 if (mos7840_port == NULL) {
1354 return;
1355 }
1356
1357 if (serial->dev) {
1358
1359 /* flush and block until tx is empty */
1360 mos7840_block_until_chase_response(mos7840_port);
1361 }
1362
1363 if (break_state == -1) {
1364 data = mos7840_port->shadowLCR | LCR_SET_BREAK;
1365 } else {
1366 data = mos7840_port->shadowLCR & ~LCR_SET_BREAK;
1367 }
1368
1369 mos7840_port->shadowLCR = data;
1370 dbg("mcs7840_break mos7840_port->shadowLCR is %x\n",
1371 mos7840_port->shadowLCR);
1372 mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER,
1373 mos7840_port->shadowLCR);
1374
1375 return;
1376 }
1377
1378 /*****************************************************************************
1379 * mos7840_write_room
1380 * this function is called by the tty driver when it wants to know how many
1381 * bytes of data we can accept for a specific port.
1382 * If successful, we return the amount of room that we have for this port
1383 * Otherwise we return a negative error number.
1384 *****************************************************************************/
1385
1386 static int mos7840_write_room(struct usb_serial_port *port)
1387 {
1388 int i;
1389 int room = 0;
1390 unsigned long flags;
1391 struct moschip_port *mos7840_port;
1392
1393 dbg("%s \n", " mos7840_write_room:entering ...........");
1394
1395 if (mos7840_port_paranoia_check(port, __func__)) {
1396 dbg("%s", "Invalid port \n");
1397 dbg("%s \n", " mos7840_write_room:leaving ...........");
1398 return -1;
1399 }
1400
1401 mos7840_port = mos7840_get_port_private(port);
1402 if (mos7840_port == NULL) {
1403 dbg("%s \n", "mos7840_break:leaving ...........");
1404 return -1;
1405 }
1406
1407 spin_lock_irqsave(&mos7840_port->pool_lock, flags);
1408 for (i = 0; i < NUM_URBS; ++i) {
1409 if (!mos7840_port->busy[i]) {
1410 room += URB_TRANSFER_BUFFER_SIZE;
1411 }
1412 }
1413 spin_unlock_irqrestore(&mos7840_port->pool_lock, flags);
1414
1415 room = (room == 0) ? 0 : room - URB_TRANSFER_BUFFER_SIZE + 1;
1416 dbg("%s - returns %d", __func__, room);
1417 return room;
1418
1419 }
1420
1421 /*****************************************************************************
1422 * mos7840_write
1423 * this function is called by the tty driver when data should be written to
1424 * the port.
1425 * If successful, we return the number of bytes written, otherwise we
1426 * return a negative error number.
1427 *****************************************************************************/
1428
1429 static int mos7840_write(struct usb_serial_port *port,
1430 const unsigned char *data, int count)
1431 {
1432 int status;
1433 int i;
1434 int bytes_sent = 0;
1435 int transfer_size;
1436 unsigned long flags;
1437
1438 struct moschip_port *mos7840_port;
1439 struct usb_serial *serial;
1440 struct urb *urb;
1441 //__u16 Data;
1442 const unsigned char *current_position = data;
1443 unsigned char *data1;
1444 dbg("%s \n", "entering ...........");
1445 //dbg("mos7840_write: mos7840_port->shadowLCR is %x\n",mos7840_port->shadowLCR);
1446
1447 #ifdef NOTMOS7840
1448 Data = 0x00;
1449 status = 0;
1450 status = mos7840_get_uart_reg(port, LINE_CONTROL_REGISTER, &Data);
1451 mos7840_port->shadowLCR = Data;
1452 dbg("mos7840_write: LINE_CONTROL_REGISTER is %x\n", Data);
1453 dbg("mos7840_write: mos7840_port->shadowLCR is %x\n",
1454 mos7840_port->shadowLCR);
1455
1456 //Data = 0x03;
1457 //status = mos7840_set_uart_reg(port,LINE_CONTROL_REGISTER,Data);
1458 //mos7840_port->shadowLCR=Data;//Need to add later
1459
1460 Data |= SERIAL_LCR_DLAB; //data latch enable in LCR 0x80
1461 status = 0;
1462 status = mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data);
1463
1464 //Data = 0x0c;
1465 //status = mos7840_set_uart_reg(port,DIVISOR_LATCH_LSB,Data);
1466 Data = 0x00;
1467 status = 0;
1468 status = mos7840_get_uart_reg(port, DIVISOR_LATCH_LSB, &Data);
1469 dbg("mos7840_write:DLL value is %x\n", Data);
1470
1471 Data = 0x0;
1472 status = 0;
1473 status = mos7840_get_uart_reg(port, DIVISOR_LATCH_MSB, &Data);
1474 dbg("mos7840_write:DLM value is %x\n", Data);
1475
1476 Data = Data & ~SERIAL_LCR_DLAB;
1477 dbg("mos7840_write: mos7840_port->shadowLCR is %x\n",
1478 mos7840_port->shadowLCR);
1479 status = 0;
1480 status = mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data);
1481 #endif
1482
1483 if (mos7840_port_paranoia_check(port, __func__)) {
1484 dbg("%s", "Port Paranoia failed \n");
1485 return -1;
1486 }
1487
1488 serial = port->serial;
1489 if (mos7840_serial_paranoia_check(serial, __func__)) {
1490 dbg("%s", "Serial Paranoia failed \n");
1491 return -1;
1492 }
1493
1494 mos7840_port = mos7840_get_port_private(port);
1495 if (mos7840_port == NULL) {
1496 dbg("%s", "mos7840_port is NULL\n");
1497 return -1;
1498 }
1499
1500 /* try to find a free urb in the list */
1501 urb = NULL;
1502
1503 spin_lock_irqsave(&mos7840_port->pool_lock, flags);
1504 for (i = 0; i < NUM_URBS; ++i) {
1505 if (!mos7840_port->busy[i]) {
1506 mos7840_port->busy[i] = 1;
1507 urb = mos7840_port->write_urb_pool[i];
1508 dbg("\nURB:%d", i);
1509 break;
1510 }
1511 }
1512 spin_unlock_irqrestore(&mos7840_port->pool_lock, flags);
1513
1514 if (urb == NULL) {
1515 dbg("%s - no more free urbs", __func__);
1516 goto exit;
1517 }
1518
1519 if (urb->transfer_buffer == NULL) {
1520 urb->transfer_buffer =
1521 kmalloc(URB_TRANSFER_BUFFER_SIZE, GFP_KERNEL);
1522
1523 if (urb->transfer_buffer == NULL) {
1524 err("%s no more kernel memory...", __func__);
1525 goto exit;
1526 }
1527 }
1528 transfer_size = min(count, URB_TRANSFER_BUFFER_SIZE);
1529
1530 memcpy(urb->transfer_buffer, current_position, transfer_size);
1531
1532 /* fill urb with data and submit */
1533 usb_fill_bulk_urb(urb,
1534 serial->dev,
1535 usb_sndbulkpipe(serial->dev,
1536 port->bulk_out_endpointAddress),
1537 urb->transfer_buffer,
1538 transfer_size,
1539 mos7840_bulk_out_data_callback, mos7840_port);
1540
1541 data1 = urb->transfer_buffer;
1542 dbg("\nbulkout endpoint is %d", port->bulk_out_endpointAddress);
1543
1544 /* send it down the pipe */
1545 status = usb_submit_urb(urb, GFP_ATOMIC);
1546
1547 if (status) {
1548 mos7840_port->busy[i] = 0;
1549 err("%s - usb_submit_urb(write bulk) failed with status = %d",
1550 __func__, status);
1551 bytes_sent = status;
1552 goto exit;
1553 }
1554 bytes_sent = transfer_size;
1555 mos7840_port->icount.tx += transfer_size;
1556 smp_wmb();
1557 dbg("mos7840_port->icount.tx is %d:\n", mos7840_port->icount.tx);
1558 exit:
1559
1560 return bytes_sent;
1561
1562 }
1563
1564 /*****************************************************************************
1565 * mos7840_throttle
1566 * this function is called by the tty driver when it wants to stop the data
1567 * being read from the port.
1568 *****************************************************************************/
1569
1570 static void mos7840_throttle(struct usb_serial_port *port)
1571 {
1572 struct moschip_port *mos7840_port;
1573 struct tty_struct *tty;
1574 int status;
1575
1576 if (mos7840_port_paranoia_check(port, __func__)) {
1577 dbg("%s", "Invalid port \n");
1578 return;
1579 }
1580
1581 dbg("- port %d\n", port->number);
1582
1583 mos7840_port = mos7840_get_port_private(port);
1584
1585 if (mos7840_port == NULL)
1586 return;
1587
1588 if (!mos7840_port->open) {
1589 dbg("%s\n", "port not opened");
1590 return;
1591 }
1592
1593 dbg("%s", "Entering .......... \n");
1594
1595 tty = port->tty;
1596 if (!tty) {
1597 dbg("%s - no tty available", __func__);
1598 return;
1599 }
1600
1601 /* if we are implementing XON/XOFF, send the stop character */
1602 if (I_IXOFF(tty)) {
1603 unsigned char stop_char = STOP_CHAR(tty);
1604 status = mos7840_write(port, &stop_char, 1);
1605 if (status <= 0) {
1606 return;
1607 }
1608 }
1609
1610 /* if we are implementing RTS/CTS, toggle that line */
1611 if (tty->termios->c_cflag & CRTSCTS) {
1612 mos7840_port->shadowMCR &= ~MCR_RTS;
1613 status = 0;
1614 status =
1615 mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER,
1616 mos7840_port->shadowMCR);
1617
1618 if (status < 0) {
1619 return;
1620 }
1621 }
1622
1623 return;
1624 }
1625
1626 /*****************************************************************************
1627 * mos7840_unthrottle
1628 * this function is called by the tty driver when it wants to resume the data
1629 * being read from the port (called after SerialThrottle is called)
1630 *****************************************************************************/
1631 static void mos7840_unthrottle(struct usb_serial_port *port)
1632 {
1633 struct tty_struct *tty;
1634 int status;
1635 struct moschip_port *mos7840_port = mos7840_get_port_private(port);
1636
1637 if (mos7840_port_paranoia_check(port, __func__)) {
1638 dbg("%s", "Invalid port \n");
1639 return;
1640 }
1641
1642 if (mos7840_port == NULL)
1643 return;
1644
1645 if (!mos7840_port->open) {
1646 dbg("%s - port not opened", __func__);
1647 return;
1648 }
1649
1650 dbg("%s", "Entering .......... \n");
1651
1652 tty = port->tty;
1653 if (!tty) {
1654 dbg("%s - no tty available", __func__);
1655 return;
1656 }
1657
1658 /* if we are implementing XON/XOFF, send the start character */
1659 if (I_IXOFF(tty)) {
1660 unsigned char start_char = START_CHAR(tty);
1661 status = mos7840_write(port, &start_char, 1);
1662 if (status <= 0) {
1663 return;
1664 }
1665 }
1666
1667 /* if we are implementing RTS/CTS, toggle that line */
1668 if (tty->termios->c_cflag & CRTSCTS) {
1669 mos7840_port->shadowMCR |= MCR_RTS;
1670 status = 0;
1671 status =
1672 mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER,
1673 mos7840_port->shadowMCR);
1674 if (status < 0) {
1675 return;
1676 }
1677 }
1678
1679 return;
1680 }
1681
1682 static int mos7840_tiocmget(struct usb_serial_port *port, struct file *file)
1683 {
1684 struct moschip_port *mos7840_port;
1685 unsigned int result;
1686 __u16 msr;
1687 __u16 mcr;
1688 int status = 0;
1689 mos7840_port = mos7840_get_port_private(port);
1690
1691 dbg("%s - port %d", __func__, port->number);
1692
1693 if (mos7840_port == NULL)
1694 return -ENODEV;
1695
1696 status = mos7840_get_uart_reg(port, MODEM_STATUS_REGISTER, &msr);
1697 status = mos7840_get_uart_reg(port, MODEM_CONTROL_REGISTER, &mcr);
1698 result = ((mcr & MCR_DTR) ? TIOCM_DTR : 0)
1699 | ((mcr & MCR_RTS) ? TIOCM_RTS : 0)
1700 | ((mcr & MCR_LOOPBACK) ? TIOCM_LOOP : 0)
1701 | ((msr & MOS7840_MSR_CTS) ? TIOCM_CTS : 0)
1702 | ((msr & MOS7840_MSR_CD) ? TIOCM_CAR : 0)
1703 | ((msr & MOS7840_MSR_RI) ? TIOCM_RI : 0)
1704 | ((msr & MOS7840_MSR_DSR) ? TIOCM_DSR : 0);
1705
1706 dbg("%s - 0x%04X", __func__, result);
1707
1708 return result;
1709 }
1710
1711 static int mos7840_tiocmset(struct usb_serial_port *port, struct file *file,
1712 unsigned int set, unsigned int clear)
1713 {
1714 struct moschip_port *mos7840_port;
1715 unsigned int mcr;
1716 int status;
1717
1718 dbg("%s - port %d", __func__, port->number);
1719
1720 mos7840_port = mos7840_get_port_private(port);
1721
1722 if (mos7840_port == NULL)
1723 return -ENODEV;
1724
1725 /* FIXME: What locks the port registers ? */
1726 mcr = mos7840_port->shadowMCR;
1727 if (clear & TIOCM_RTS)
1728 mcr &= ~MCR_RTS;
1729 if (clear & TIOCM_DTR)
1730 mcr &= ~MCR_DTR;
1731 if (clear & TIOCM_LOOP)
1732 mcr &= ~MCR_LOOPBACK;
1733
1734 if (set & TIOCM_RTS)
1735 mcr |= MCR_RTS;
1736 if (set & TIOCM_DTR)
1737 mcr |= MCR_DTR;
1738 if (set & TIOCM_LOOP)
1739 mcr |= MCR_LOOPBACK;
1740
1741 mos7840_port->shadowMCR = mcr;
1742
1743 status = mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER, mcr);
1744 if (status < 0) {
1745 dbg("setting MODEM_CONTROL_REGISTER Failed\n");
1746 return status;
1747 }
1748
1749 return 0;
1750 }
1751
1752 /*****************************************************************************
1753 * mos7840_calc_baud_rate_divisor
1754 * this function calculates the proper baud rate divisor for the specified
1755 * baud rate.
1756 *****************************************************************************/
1757 static int mos7840_calc_baud_rate_divisor(int baudRate, int *divisor,
1758 __u16 * clk_sel_val)
1759 {
1760
1761 dbg("%s - %d", __func__, baudRate);
1762
1763 if (baudRate <= 115200) {
1764 *divisor = 115200 / baudRate;
1765 *clk_sel_val = 0x0;
1766 }
1767 if ((baudRate > 115200) && (baudRate <= 230400)) {
1768 *divisor = 230400 / baudRate;
1769 *clk_sel_val = 0x10;
1770 } else if ((baudRate > 230400) && (baudRate <= 403200)) {
1771 *divisor = 403200 / baudRate;
1772 *clk_sel_val = 0x20;
1773 } else if ((baudRate > 403200) && (baudRate <= 460800)) {
1774 *divisor = 460800 / baudRate;
1775 *clk_sel_val = 0x30;
1776 } else if ((baudRate > 460800) && (baudRate <= 806400)) {
1777 *divisor = 806400 / baudRate;
1778 *clk_sel_val = 0x40;
1779 } else if ((baudRate > 806400) && (baudRate <= 921600)) {
1780 *divisor = 921600 / baudRate;
1781 *clk_sel_val = 0x50;
1782 } else if ((baudRate > 921600) && (baudRate <= 1572864)) {
1783 *divisor = 1572864 / baudRate;
1784 *clk_sel_val = 0x60;
1785 } else if ((baudRate > 1572864) && (baudRate <= 3145728)) {
1786 *divisor = 3145728 / baudRate;
1787 *clk_sel_val = 0x70;
1788 }
1789 return 0;
1790
1791 #ifdef NOTMCS7840
1792
1793 for (i = 0; i < ARRAY_SIZE(mos7840_divisor_table); i++) {
1794 if (mos7840_divisor_table[i].BaudRate == baudrate) {
1795 *divisor = mos7840_divisor_table[i].Divisor;
1796 return 0;
1797 }
1798 }
1799
1800 /* After trying for all the standard baud rates *
1801 * Try calculating the divisor for this baud rate */
1802
1803 if (baudrate > 75 && baudrate < 230400) {
1804 /* get the divisor */
1805 custom = (__u16) (230400L / baudrate);
1806
1807 /* Check for round off */
1808 round1 = (__u16) (2304000L / baudrate);
1809 round = (__u16) (round1 - (custom * 10));
1810 if (round > 4) {
1811 custom++;
1812 }
1813 *divisor = custom;
1814
1815 dbg(" Baud %d = %d\n", baudrate, custom);
1816 return 0;
1817 }
1818
1819 dbg("%s\n", " Baud calculation Failed...");
1820 return -1;
1821 #endif
1822 }
1823
1824 /*****************************************************************************
1825 * mos7840_send_cmd_write_baud_rate
1826 * this function sends the proper command to change the baud rate of the
1827 * specified port.
1828 *****************************************************************************/
1829
1830 static int mos7840_send_cmd_write_baud_rate(struct moschip_port *mos7840_port,
1831 int baudRate)
1832 {
1833 int divisor = 0;
1834 int status;
1835 __u16 Data;
1836 unsigned char number;
1837 __u16 clk_sel_val;
1838 struct usb_serial_port *port;
1839
1840 if (mos7840_port == NULL)
1841 return -1;
1842
1843 port = (struct usb_serial_port *)mos7840_port->port;
1844 if (mos7840_port_paranoia_check(port, __func__)) {
1845 dbg("%s", "Invalid port \n");
1846 return -1;
1847 }
1848
1849 if (mos7840_serial_paranoia_check(port->serial, __func__)) {
1850 dbg("%s", "Invalid Serial \n");
1851 return -1;
1852 }
1853
1854 dbg("%s", "Entering .......... \n");
1855
1856 number = mos7840_port->port->number - mos7840_port->port->serial->minor;
1857
1858 dbg("%s - port = %d, baud = %d", __func__,
1859 mos7840_port->port->number, baudRate);
1860 //reset clk_uart_sel in spregOffset
1861 if (baudRate > 115200) {
1862 #ifdef HW_flow_control
1863 //NOTE: need to see the pther register to modify
1864 //setting h/w flow control bit to 1;
1865 status = 0;
1866 Data = 0x2b;
1867 mos7840_port->shadowMCR = Data;
1868 status =
1869 mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER, Data);
1870 if (status < 0) {
1871 dbg("Writing spreg failed in set_serial_baud\n");
1872 return -1;
1873 }
1874 #endif
1875
1876 } else {
1877 #ifdef HW_flow_control
1878 //setting h/w flow control bit to 0;
1879 status = 0;
1880 Data = 0xb;
1881 mos7840_port->shadowMCR = Data;
1882 status =
1883 mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER, Data);
1884 if (status < 0) {
1885 dbg("Writing spreg failed in set_serial_baud\n");
1886 return -1;
1887 }
1888 #endif
1889
1890 }
1891
1892 if (1) //baudRate <= 115200)
1893 {
1894 clk_sel_val = 0x0;
1895 Data = 0x0;
1896 status = 0;
1897 status =
1898 mos7840_calc_baud_rate_divisor(baudRate, &divisor,
1899 &clk_sel_val);
1900 status =
1901 mos7840_get_reg_sync(port, mos7840_port->SpRegOffset,
1902 &Data);
1903 if (status < 0) {
1904 dbg("reading spreg failed in set_serial_baud\n");
1905 return -1;
1906 }
1907 Data = (Data & 0x8f) | clk_sel_val;
1908 status = 0;
1909 status =
1910 mos7840_set_reg_sync(port, mos7840_port->SpRegOffset, Data);
1911 if (status < 0) {
1912 dbg("Writing spreg failed in set_serial_baud\n");
1913 return -1;
1914 }
1915 /* Calculate the Divisor */
1916
1917 if (status) {
1918 err("%s - bad baud rate", __func__);
1919 dbg("%s\n", "bad baud rate");
1920 return status;
1921 }
1922 /* Enable access to divisor latch */
1923 Data = mos7840_port->shadowLCR | SERIAL_LCR_DLAB;
1924 mos7840_port->shadowLCR = Data;
1925 mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data);
1926
1927 /* Write the divisor */
1928 Data = (unsigned char)(divisor & 0xff);
1929 dbg("set_serial_baud Value to write DLL is %x\n", Data);
1930 mos7840_set_uart_reg(port, DIVISOR_LATCH_LSB, Data);
1931
1932 Data = (unsigned char)((divisor & 0xff00) >> 8);
1933 dbg("set_serial_baud Value to write DLM is %x\n", Data);
1934 mos7840_set_uart_reg(port, DIVISOR_LATCH_MSB, Data);
1935
1936 /* Disable access to divisor latch */
1937 Data = mos7840_port->shadowLCR & ~SERIAL_LCR_DLAB;
1938 mos7840_port->shadowLCR = Data;
1939 mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data);
1940
1941 }
1942
1943 return status;
1944 }
1945
1946 /*****************************************************************************
1947 * mos7840_change_port_settings
1948 * This routine is called to set the UART on the device to match
1949 * the specified new settings.
1950 *****************************************************************************/
1951
1952 static void mos7840_change_port_settings(struct moschip_port *mos7840_port,
1953 struct ktermios *old_termios)
1954 {
1955 struct tty_struct *tty;
1956 int baud;
1957 unsigned cflag;
1958 unsigned iflag;
1959 __u8 lData;
1960 __u8 lParity;
1961 __u8 lStop;
1962 int status;
1963 __u16 Data;
1964 struct usb_serial_port *port;
1965 struct usb_serial *serial;
1966
1967 if (mos7840_port == NULL)
1968 return;
1969
1970 port = (struct usb_serial_port *)mos7840_port->port;
1971
1972 if (mos7840_port_paranoia_check(port, __func__)) {
1973 dbg("%s", "Invalid port \n");
1974 return;
1975 }
1976
1977 if (mos7840_serial_paranoia_check(port->serial, __func__)) {
1978 dbg("%s", "Invalid Serial \n");
1979 return;
1980 }
1981
1982 serial = port->serial;
1983
1984 dbg("%s - port %d", __func__, mos7840_port->port->number);
1985
1986 if (!mos7840_port->open) {
1987 dbg("%s - port not opened", __func__);
1988 return;
1989 }
1990
1991 tty = mos7840_port->port->tty;
1992
1993 dbg("%s", "Entering .......... \n");
1994
1995 lData = LCR_BITS_8;
1996 lStop = LCR_STOP_1;
1997 lParity = LCR_PAR_NONE;
1998
1999 cflag = tty->termios->c_cflag;
2000 iflag = tty->termios->c_iflag;
2001
2002 /* Change the number of bits */
2003 if (cflag & CSIZE) {
2004 switch (cflag & CSIZE) {
2005 case CS5:
2006 lData = LCR_BITS_5;
2007 break;
2008
2009 case CS6:
2010 lData = LCR_BITS_6;
2011 break;
2012
2013 case CS7:
2014 lData = LCR_BITS_7;
2015 break;
2016 default:
2017 case CS8:
2018 lData = LCR_BITS_8;
2019 break;
2020 }
2021 }
2022 /* Change the Parity bit */
2023 if (cflag & PARENB) {
2024 if (cflag & PARODD) {
2025 lParity = LCR_PAR_ODD;
2026 dbg("%s - parity = odd", __func__);
2027 } else {
2028 lParity = LCR_PAR_EVEN;
2029 dbg("%s - parity = even", __func__);
2030 }
2031
2032 } else {
2033 dbg("%s - parity = none", __func__);
2034 }
2035
2036 if (cflag & CMSPAR) {
2037 lParity = lParity | 0x20;
2038 }
2039
2040 /* Change the Stop bit */
2041 if (cflag & CSTOPB) {
2042 lStop = LCR_STOP_2;
2043 dbg("%s - stop bits = 2", __func__);
2044 } else {
2045 lStop = LCR_STOP_1;
2046 dbg("%s - stop bits = 1", __func__);
2047 }
2048
2049 /* Update the LCR with the correct value */
2050 mos7840_port->shadowLCR &=
2051 ~(LCR_BITS_MASK | LCR_STOP_MASK | LCR_PAR_MASK);
2052 mos7840_port->shadowLCR |= (lData | lParity | lStop);
2053
2054 dbg("mos7840_change_port_settings mos7840_port->shadowLCR is %x\n",
2055 mos7840_port->shadowLCR);
2056 /* Disable Interrupts */
2057 Data = 0x00;
2058 mos7840_set_uart_reg(port, INTERRUPT_ENABLE_REGISTER, Data);
2059
2060 Data = 0x00;
2061 mos7840_set_uart_reg(port, FIFO_CONTROL_REGISTER, Data);
2062
2063 Data = 0xcf;
2064 mos7840_set_uart_reg(port, FIFO_CONTROL_REGISTER, Data);
2065
2066 /* Send the updated LCR value to the mos7840 */
2067 Data = mos7840_port->shadowLCR;
2068
2069 mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data);
2070
2071 Data = 0x00b;
2072 mos7840_port->shadowMCR = Data;
2073 mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER, Data);
2074 Data = 0x00b;
2075 mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER, Data);
2076
2077 /* set up the MCR register and send it to the mos7840 */
2078
2079 mos7840_port->shadowMCR = MCR_MASTER_IE;
2080 if (cflag & CBAUD) {
2081 mos7840_port->shadowMCR |= (MCR_DTR | MCR_RTS);
2082 }
2083
2084 if (cflag & CRTSCTS) {
2085 mos7840_port->shadowMCR |= (MCR_XON_ANY);
2086
2087 } else {
2088 mos7840_port->shadowMCR &= ~(MCR_XON_ANY);
2089 }
2090
2091 Data = mos7840_port->shadowMCR;
2092 mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER, Data);
2093
2094 /* Determine divisor based on baud rate */
2095 baud = tty_get_baud_rate(tty);
2096
2097 if (!baud) {
2098 /* pick a default, any default... */
2099 dbg("%s\n", "Picked default baud...");
2100 baud = 9600;
2101 }
2102
2103 dbg("%s - baud rate = %d", __func__, baud);
2104 status = mos7840_send_cmd_write_baud_rate(mos7840_port, baud);
2105
2106 /* Enable Interrupts */
2107 Data = 0x0c;
2108 mos7840_set_uart_reg(port, INTERRUPT_ENABLE_REGISTER, Data);
2109
2110 if (mos7840_port->read_urb->status != -EINPROGRESS) {
2111 mos7840_port->read_urb->dev = serial->dev;
2112
2113 status = usb_submit_urb(mos7840_port->read_urb, GFP_ATOMIC);
2114
2115 if (status) {
2116 dbg(" usb_submit_urb(read bulk) failed, status = %d",
2117 status);
2118 }
2119 }
2120 wake_up(&mos7840_port->delta_msr_wait);
2121 mos7840_port->delta_msr_cond = 1;
2122 dbg("mos7840_change_port_settings mos7840_port->shadowLCR is End %x\n",
2123 mos7840_port->shadowLCR);
2124
2125 return;
2126 }
2127
2128 /*****************************************************************************
2129 * mos7840_set_termios
2130 * this function is called by the tty driver when it wants to change
2131 * the termios structure
2132 *****************************************************************************/
2133
2134 static void mos7840_set_termios(struct usb_serial_port *port,
2135 struct ktermios *old_termios)
2136 {
2137 int status;
2138 unsigned int cflag;
2139 struct usb_serial *serial;
2140 struct moschip_port *mos7840_port;
2141 struct tty_struct *tty;
2142 dbg("mos7840_set_termios: START\n");
2143 if (mos7840_port_paranoia_check(port, __func__)) {
2144 dbg("%s", "Invalid port \n");
2145 return;
2146 }
2147
2148 serial = port->serial;
2149
2150 if (mos7840_serial_paranoia_check(serial, __func__)) {
2151 dbg("%s", "Invalid Serial \n");
2152 return;
2153 }
2154
2155 mos7840_port = mos7840_get_port_private(port);
2156
2157 if (mos7840_port == NULL)
2158 return;
2159
2160 tty = port->tty;
2161
2162 if (!mos7840_port->open) {
2163 dbg("%s - port not opened", __func__);
2164 return;
2165 }
2166
2167 dbg("%s\n", "setting termios - ");
2168
2169 cflag = tty->termios->c_cflag;
2170
2171 dbg("%s - clfag %08x iflag %08x", __func__,
2172 tty->termios->c_cflag, RELEVANT_IFLAG(tty->termios->c_iflag));
2173 dbg("%s - old clfag %08x old iflag %08x", __func__,
2174 old_termios->c_cflag, RELEVANT_IFLAG(old_termios->c_iflag));
2175 dbg("%s - port %d", __func__, port->number);
2176
2177 /* change the port settings to the new ones specified */
2178
2179 mos7840_change_port_settings(mos7840_port, old_termios);
2180
2181 if (!mos7840_port->read_urb) {
2182 dbg("%s", "URB KILLED !!!!!\n");
2183 return;
2184 }
2185
2186 if (mos7840_port->read_urb->status != -EINPROGRESS) {
2187 mos7840_port->read_urb->dev = serial->dev;
2188 status = usb_submit_urb(mos7840_port->read_urb, GFP_ATOMIC);
2189 if (status) {
2190 dbg(" usb_submit_urb(read bulk) failed, status = %d",
2191 status);
2192 }
2193 }
2194 return;
2195 }
2196
2197 /*****************************************************************************
2198 * mos7840_get_lsr_info - get line status register info
2199 *
2200 * Purpose: Let user call ioctl() to get info when the UART physically
2201 * is emptied. On bus types like RS485, the transmitter must
2202 * release the bus after transmitting. This must be done when
2203 * the transmit shift register is empty, not be done when the
2204 * transmit holding register is empty. This functionality
2205 * allows an RS485 driver to be written in user space.
2206 *****************************************************************************/
2207
2208 static int mos7840_get_lsr_info(struct moschip_port *mos7840_port,
2209 unsigned int __user *value)
2210 {
2211 int count;
2212 unsigned int result = 0;
2213
2214 count = mos7840_chars_in_buffer(mos7840_port->port);
2215 if (count == 0) {
2216 dbg("%s -- Empty", __func__);
2217 result = TIOCSER_TEMT;
2218 }
2219
2220 if (copy_to_user(value, &result, sizeof(int)))
2221 return -EFAULT;
2222 return 0;
2223 }
2224
2225 /*****************************************************************************
2226 * mos7840_set_modem_info
2227 * function to set modem info
2228 *****************************************************************************/
2229
2230 static int mos7840_set_modem_info(struct moschip_port *mos7840_port,
2231 unsigned int cmd, unsigned int __user *value)
2232 {
2233 unsigned int mcr;
2234 unsigned int arg;
2235 __u16 Data;
2236 int status;
2237 struct usb_serial_port *port;
2238
2239 if (mos7840_port == NULL)
2240 return -1;
2241
2242 port = (struct usb_serial_port *)mos7840_port->port;
2243 if (mos7840_port_paranoia_check(port, __func__)) {
2244 dbg("%s", "Invalid port \n");
2245 return -1;
2246 }
2247
2248 mcr = mos7840_port->shadowMCR;
2249
2250 if (copy_from_user(&arg, value, sizeof(int)))
2251 return -EFAULT;
2252
2253 switch (cmd) {
2254 case TIOCMBIS:
2255 if (arg & TIOCM_RTS)
2256 mcr |= MCR_RTS;
2257 if (arg & TIOCM_DTR)
2258 mcr |= MCR_RTS;
2259 if (arg & TIOCM_LOOP)
2260 mcr |= MCR_LOOPBACK;
2261 break;
2262
2263 case TIOCMBIC:
2264 if (arg & TIOCM_RTS)
2265 mcr &= ~MCR_RTS;
2266 if (arg & TIOCM_DTR)
2267 mcr &= ~MCR_RTS;
2268 if (arg & TIOCM_LOOP)
2269 mcr &= ~MCR_LOOPBACK;
2270 break;
2271
2272 case TIOCMSET:
2273 /* turn off the RTS and DTR and LOOPBACK
2274 * and then only turn on what was asked to */
2275 mcr &= ~(MCR_RTS | MCR_DTR | MCR_LOOPBACK);
2276 mcr |= ((arg & TIOCM_RTS) ? MCR_RTS : 0);
2277 mcr |= ((arg & TIOCM_DTR) ? MCR_DTR : 0);
2278 mcr |= ((arg & TIOCM_LOOP) ? MCR_LOOPBACK : 0);
2279 break;
2280 }
2281
2282 mos7840_port->shadowMCR = mcr;
2283
2284 Data = mos7840_port->shadowMCR;
2285 status = 0;
2286 status = mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER, Data);
2287 if (status < 0) {
2288 dbg("setting MODEM_CONTROL_REGISTER Failed\n");
2289 return -1;
2290 }
2291
2292 return 0;
2293 }
2294
2295 /*****************************************************************************
2296 * mos7840_get_modem_info
2297 * function to get modem info
2298 *****************************************************************************/
2299
2300 static int mos7840_get_modem_info(struct moschip_port *mos7840_port,
2301 unsigned int __user *value)
2302 {
2303 unsigned int result = 0;
2304 __u16 msr;
2305 unsigned int mcr = mos7840_port->shadowMCR;
2306 int status = 0;
2307 status =
2308 mos7840_get_uart_reg(mos7840_port->port, MODEM_STATUS_REGISTER,
2309 &msr);
2310 result = ((mcr & MCR_DTR) ? TIOCM_DTR : 0) /* 0x002 */
2311 |((mcr & MCR_RTS) ? TIOCM_RTS : 0) /* 0x004 */
2312 |((msr & MOS7840_MSR_CTS) ? TIOCM_CTS : 0) /* 0x020 */
2313 |((msr & MOS7840_MSR_CD) ? TIOCM_CAR : 0) /* 0x040 */
2314 |((msr & MOS7840_MSR_RI) ? TIOCM_RI : 0) /* 0x080 */
2315 |((msr & MOS7840_MSR_DSR) ? TIOCM_DSR : 0); /* 0x100 */
2316
2317 dbg("%s -- %x", __func__, result);
2318
2319 if (copy_to_user(value, &result, sizeof(int)))
2320 return -EFAULT;
2321 return 0;
2322 }
2323
2324 /*****************************************************************************
2325 * mos7840_get_serial_info
2326 * function to get information about serial port
2327 *****************************************************************************/
2328
2329 static int mos7840_get_serial_info(struct moschip_port *mos7840_port,
2330 struct serial_struct __user *retinfo)
2331 {
2332 struct serial_struct tmp;
2333
2334 if (mos7840_port == NULL)
2335 return -1;
2336
2337 if (!retinfo)
2338 return -EFAULT;
2339
2340 memset(&tmp, 0, sizeof(tmp));
2341
2342 tmp.type = PORT_16550A;
2343 tmp.line = mos7840_port->port->serial->minor;
2344 tmp.port = mos7840_port->port->number;
2345 tmp.irq = 0;
2346 tmp.flags = ASYNC_SKIP_TEST | ASYNC_AUTO_IRQ;
2347 tmp.xmit_fifo_size = NUM_URBS * URB_TRANSFER_BUFFER_SIZE;
2348 tmp.baud_base = 9600;
2349 tmp.close_delay = 5 * HZ;
2350 tmp.closing_wait = 30 * HZ;
2351
2352 if (copy_to_user(retinfo, &tmp, sizeof(*retinfo)))
2353 return -EFAULT;
2354 return 0;
2355 }
2356
2357 /*****************************************************************************
2358 * SerialIoctl
2359 * this function handles any ioctl calls to the driver
2360 *****************************************************************************/
2361
2362 static int mos7840_ioctl(struct usb_serial_port *port, struct file *file,
2363 unsigned int cmd, unsigned long arg)
2364 {
2365 void __user *argp = (void __user *)arg;
2366 struct moschip_port *mos7840_port;
2367 struct tty_struct *tty;
2368
2369 struct async_icount cnow;
2370 struct async_icount cprev;
2371 struct serial_icounter_struct icount;
2372 int mosret = 0;
2373
2374 if (mos7840_port_paranoia_check(port, __func__)) {
2375 dbg("%s", "Invalid port \n");
2376 return -1;
2377 }
2378
2379 mos7840_port = mos7840_get_port_private(port);
2380
2381 if (mos7840_port == NULL)
2382 return -1;
2383
2384 tty = mos7840_port->port->tty;
2385
2386 dbg("%s - port %d, cmd = 0x%x", __func__, port->number, cmd);
2387
2388 switch (cmd) {
2389 /* return number of bytes available */
2390
2391 case TIOCSERGETLSR:
2392 dbg("%s (%d) TIOCSERGETLSR", __func__, port->number);
2393 return mos7840_get_lsr_info(mos7840_port, argp);
2394 return 0;
2395
2396 case TIOCMBIS:
2397 case TIOCMBIC:
2398 case TIOCMSET:
2399 dbg("%s (%d) TIOCMSET/TIOCMBIC/TIOCMSET", __func__,
2400 port->number);
2401 mosret =
2402 mos7840_set_modem_info(mos7840_port, cmd, argp);
2403 return mosret;
2404
2405 case TIOCMGET:
2406 dbg("%s (%d) TIOCMGET", __func__, port->number);
2407 return mos7840_get_modem_info(mos7840_port, argp);
2408
2409 case TIOCGSERIAL:
2410 dbg("%s (%d) TIOCGSERIAL", __func__, port->number);
2411 return mos7840_get_serial_info(mos7840_port, argp);
2412
2413 case TIOCSSERIAL:
2414 dbg("%s (%d) TIOCSSERIAL", __func__, port->number);
2415 break;
2416
2417 case TIOCMIWAIT:
2418 dbg("%s (%d) TIOCMIWAIT", __func__, port->number);
2419 cprev = mos7840_port->icount;
2420 while (1) {
2421 //interruptible_sleep_on(&mos7840_port->delta_msr_wait);
2422 mos7840_port->delta_msr_cond = 0;
2423 wait_event_interruptible(mos7840_port->delta_msr_wait,
2424 (mos7840_port->
2425 delta_msr_cond == 1));
2426
2427 /* see if a signal did it */
2428 if (signal_pending(current))
2429 return -ERESTARTSYS;
2430 cnow = mos7840_port->icount;
2431 smp_rmb();
2432 if (cnow.rng == cprev.rng && cnow.dsr == cprev.dsr &&
2433 cnow.dcd == cprev.dcd && cnow.cts == cprev.cts)
2434 return -EIO; /* no change => error */
2435 if (((arg & TIOCM_RNG) && (cnow.rng != cprev.rng)) ||
2436 ((arg & TIOCM_DSR) && (cnow.dsr != cprev.dsr)) ||
2437 ((arg & TIOCM_CD) && (cnow.dcd != cprev.dcd)) ||
2438 ((arg & TIOCM_CTS) && (cnow.cts != cprev.cts))) {
2439 return 0;
2440 }
2441 cprev = cnow;
2442 }
2443 /* NOTREACHED */
2444 break;
2445
2446 case TIOCGICOUNT:
2447 cnow = mos7840_port->icount;
2448 smp_rmb();
2449 icount.cts = cnow.cts;
2450 icount.dsr = cnow.dsr;
2451 icount.rng = cnow.rng;
2452 icount.dcd = cnow.dcd;
2453 icount.rx = cnow.rx;
2454 icount.tx = cnow.tx;
2455 icount.frame = cnow.frame;
2456 icount.overrun = cnow.overrun;
2457 icount.parity = cnow.parity;
2458 icount.brk = cnow.brk;
2459 icount.buf_overrun = cnow.buf_overrun;
2460
2461 dbg("%s (%d) TIOCGICOUNT RX=%d, TX=%d", __func__,
2462 port->number, icount.rx, icount.tx);
2463 if (copy_to_user(argp, &icount, sizeof(icount)))
2464 return -EFAULT;
2465 return 0;
2466
2467 case TIOCEXBAUD:
2468 return 0;
2469 default:
2470 break;
2471 }
2472
2473 return -ENOIOCTLCMD;
2474 }
2475
2476 static int mos7840_calc_num_ports(struct usb_serial *serial)
2477 {
2478 int mos7840_num_ports = 0;
2479
2480 dbg("numberofendpoints: %d \n",
2481 (int)serial->interface->cur_altsetting->desc.bNumEndpoints);
2482 dbg("numberofendpoints: %d \n",
2483 (int)serial->interface->altsetting->desc.bNumEndpoints);
2484 if (serial->interface->cur_altsetting->desc.bNumEndpoints == 5) {
2485 mos7840_num_ports = serial->num_ports = 2;
2486 } else if (serial->interface->cur_altsetting->desc.bNumEndpoints == 9) {
2487 serial->num_bulk_in = 4;
2488 serial->num_bulk_out = 4;
2489 mos7840_num_ports = serial->num_ports = 4;
2490 }
2491
2492 return mos7840_num_ports;
2493 }
2494
2495 /****************************************************************************
2496 * mos7840_startup
2497 ****************************************************************************/
2498
2499 static int mos7840_startup(struct usb_serial *serial)
2500 {
2501 struct moschip_port *mos7840_port;
2502 struct usb_device *dev;
2503 int i, status;
2504
2505 __u16 Data;
2506 dbg("%s \n", " mos7840_startup :entering..........");
2507
2508 if (!serial) {
2509 dbg("%s\n", "Invalid Handler");
2510 return -1;
2511 }
2512
2513 dev = serial->dev;
2514
2515 dbg("%s\n", "Entering...");
2516
2517 /* we set up the pointers to the endpoints in the mos7840_open *
2518 * function, as the structures aren't created yet. */
2519
2520 /* set up port private structures */
2521 for (i = 0; i < serial->num_ports; ++i) {
2522 mos7840_port = kzalloc(sizeof(struct moschip_port), GFP_KERNEL);
2523 if (mos7840_port == NULL) {
2524 err("%s - Out of memory", __func__);
2525 status = -ENOMEM;
2526 i--; /* don't follow NULL pointer cleaning up */
2527 goto error;
2528 }
2529
2530 /* Initialize all port interrupt end point to port 0 int endpoint *
2531 * Our device has only one interrupt end point comman to all port */
2532
2533 mos7840_port->port = serial->port[i];
2534 mos7840_set_port_private(serial->port[i], mos7840_port);
2535 spin_lock_init(&mos7840_port->pool_lock);
2536
2537 mos7840_port->port_num = ((serial->port[i]->number -
2538 (serial->port[i]->serial->minor)) +
2539 1);
2540
2541 if (mos7840_port->port_num == 1) {
2542 mos7840_port->SpRegOffset = 0x0;
2543 mos7840_port->ControlRegOffset = 0x1;
2544 mos7840_port->DcrRegOffset = 0x4;
2545 } else if ((mos7840_port->port_num == 2)
2546 && (serial->num_ports == 4)) {
2547 mos7840_port->SpRegOffset = 0x8;
2548 mos7840_port->ControlRegOffset = 0x9;
2549 mos7840_port->DcrRegOffset = 0x16;
2550 } else if ((mos7840_port->port_num == 2)
2551 && (serial->num_ports == 2)) {
2552 mos7840_port->SpRegOffset = 0xa;
2553 mos7840_port->ControlRegOffset = 0xb;
2554 mos7840_port->DcrRegOffset = 0x19;
2555 } else if ((mos7840_port->port_num == 3)
2556 && (serial->num_ports == 4)) {
2557 mos7840_port->SpRegOffset = 0xa;
2558 mos7840_port->ControlRegOffset = 0xb;
2559 mos7840_port->DcrRegOffset = 0x19;
2560 } else if ((mos7840_port->port_num == 4)
2561 && (serial->num_ports == 4)) {
2562 mos7840_port->SpRegOffset = 0xc;
2563 mos7840_port->ControlRegOffset = 0xd;
2564 mos7840_port->DcrRegOffset = 0x1c;
2565 }
2566 mos7840_dump_serial_port(mos7840_port);
2567
2568 mos7840_set_port_private(serial->port[i], mos7840_port);
2569
2570 //enable rx_disable bit in control register
2571
2572 status =
2573 mos7840_get_reg_sync(serial->port[i],
2574 mos7840_port->ControlRegOffset, &Data);
2575 if (status < 0) {
2576 dbg("Reading ControlReg failed status-0x%x\n", status);
2577 break;
2578 } else
2579 dbg("ControlReg Reading success val is %x, status%d\n",
2580 Data, status);
2581 Data |= 0x08; //setting driver done bit
2582 Data |= 0x04; //sp1_bit to have cts change reflect in modem status reg
2583
2584 //Data |= 0x20; //rx_disable bit
2585 status = 0;
2586 status =
2587 mos7840_set_reg_sync(serial->port[i],
2588 mos7840_port->ControlRegOffset, Data);
2589 if (status < 0) {
2590 dbg("Writing ControlReg failed(rx_disable) status-0x%x\n", status);
2591 break;
2592 } else
2593 dbg("ControlReg Writing success(rx_disable) status%d\n",
2594 status);
2595
2596 //Write default values in DCR (i.e 0x01 in DCR0, 0x05 in DCR2 and 0x24 in DCR3
2597 Data = 0x01;
2598 status = 0;
2599 status =
2600 mos7840_set_reg_sync(serial->port[i],
2601 (__u16) (mos7840_port->DcrRegOffset +
2602 0), Data);
2603 if (status < 0) {
2604 dbg("Writing DCR0 failed status-0x%x\n", status);
2605 break;
2606 } else
2607 dbg("DCR0 Writing success status%d\n", status);
2608
2609 Data = 0x05;
2610 status = 0;
2611 status =
2612 mos7840_set_reg_sync(serial->port[i],
2613 (__u16) (mos7840_port->DcrRegOffset +
2614 1), Data);
2615 if (status < 0) {
2616 dbg("Writing DCR1 failed status-0x%x\n", status);
2617 break;
2618 } else
2619 dbg("DCR1 Writing success status%d\n", status);
2620
2621 Data = 0x24;
2622 status = 0;
2623 status =
2624 mos7840_set_reg_sync(serial->port[i],
2625 (__u16) (mos7840_port->DcrRegOffset +
2626 2), Data);
2627 if (status < 0) {
2628 dbg("Writing DCR2 failed status-0x%x\n", status);
2629 break;
2630 } else
2631 dbg("DCR2 Writing success status%d\n", status);
2632
2633 // write values in clkstart0x0 and clkmulti 0x20
2634 Data = 0x0;
2635 status = 0;
2636 status =
2637 mos7840_set_reg_sync(serial->port[i],
2638 CLK_START_VALUE_REGISTER, Data);
2639 if (status < 0) {
2640 dbg("Writing CLK_START_VALUE_REGISTER failed status-0x%x\n", status);
2641 break;
2642 } else
2643 dbg("CLK_START_VALUE_REGISTER Writing success status%d\n", status);
2644
2645 Data = 0x20;
2646 status =
2647 mos7840_set_reg_sync(serial->port[i], CLK_MULTI_REGISTER,
2648 Data);
2649 if (status < 0) {
2650 dbg("Writing CLK_MULTI_REGISTER failed status-0x%x\n",
2651 status);
2652 goto error;
2653 } else
2654 dbg("CLK_MULTI_REGISTER Writing success status%d\n",
2655 status);
2656
2657 //write value 0x0 to scratchpad register
2658 Data = 0x00;
2659 status =
2660 mos7840_set_uart_reg(serial->port[i], SCRATCH_PAD_REGISTER,
2661 Data);
2662 if (status < 0) {
2663 dbg("Writing SCRATCH_PAD_REGISTER failed status-0x%x\n",
2664 status);
2665 break;
2666 } else
2667 dbg("SCRATCH_PAD_REGISTER Writing success status%d\n",
2668 status);
2669
2670 //Zero Length flag register
2671 if ((mos7840_port->port_num != 1)
2672 && (serial->num_ports == 2)) {
2673
2674 Data = 0xff;
2675 status = 0;
2676 status = mos7840_set_reg_sync(serial->port[i],
2677 (__u16) (ZLP_REG1 +
2678 ((__u16)
2679 mos7840_port->
2680 port_num)),
2681 Data);
2682 dbg("ZLIP offset%x\n",
2683 (__u16) (ZLP_REG1 +
2684 ((__u16) mos7840_port->port_num)));
2685 if (status < 0) {
2686 dbg("Writing ZLP_REG%d failed status-0x%x\n",
2687 i + 2, status);
2688 break;
2689 } else
2690 dbg("ZLP_REG%d Writing success status%d\n",
2691 i + 2, status);
2692 } else {
2693 Data = 0xff;
2694 status = 0;
2695 status = mos7840_set_reg_sync(serial->port[i],
2696 (__u16) (ZLP_REG1 +
2697 ((__u16)
2698 mos7840_port->
2699 port_num) -
2700 0x1), Data);
2701 dbg("ZLIP offset%x\n",
2702 (__u16) (ZLP_REG1 +
2703 ((__u16) mos7840_port->port_num) - 0x1));
2704 if (status < 0) {
2705 dbg("Writing ZLP_REG%d failed status-0x%x\n",
2706 i + 1, status);
2707 break;
2708 } else
2709 dbg("ZLP_REG%d Writing success status%d\n",
2710 i + 1, status);
2711
2712 }
2713 mos7840_port->control_urb = usb_alloc_urb(0, GFP_KERNEL);
2714 mos7840_port->ctrl_buf = kmalloc(16, GFP_KERNEL);
2715 mos7840_port->dr = kmalloc(sizeof(struct usb_ctrlrequest), GFP_KERNEL);
2716 if (!mos7840_port->control_urb || !mos7840_port->ctrl_buf || !mos7840_port->dr) {
2717 status = -ENOMEM;
2718 goto error;
2719 }
2720 }
2721
2722 //Zero Length flag enable
2723 Data = 0x0f;
2724 status = mos7840_set_reg_sync(serial->port[0], ZLP_REG5, Data);
2725 if (status < 0) {
2726 dbg("Writing ZLP_REG5 failed status-0x%x\n", status);
2727 goto error;
2728 } else
2729 dbg("ZLP_REG5 Writing success status%d\n", status);
2730
2731 /* setting configuration feature to one */
2732 usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0),
2733 (__u8) 0x03, 0x00, 0x01, 0x00, NULL, 0x00, 5 * HZ);
2734 return 0;
2735 error:
2736 for (/* nothing */; i >= 0; i--) {
2737 mos7840_port = mos7840_get_port_private(serial->port[i]);
2738
2739 kfree(mos7840_port->dr);
2740 kfree(mos7840_port->ctrl_buf);
2741 usb_free_urb(mos7840_port->control_urb);
2742 kfree(mos7840_port);
2743 serial->port[i] = NULL;
2744 }
2745 return status;
2746 }
2747
2748 /****************************************************************************
2749 * mos7840_shutdown
2750 * This function is called whenever the device is removed from the usb bus.
2751 ****************************************************************************/
2752
2753 static void mos7840_shutdown(struct usb_serial *serial)
2754 {
2755 int i;
2756 unsigned long flags;
2757 struct moschip_port *mos7840_port;
2758 dbg("%s \n", " shutdown :entering..........");
2759
2760 if (!serial) {
2761 dbg("%s", "Invalid Handler \n");
2762 return;
2763 }
2764
2765 /* check for the ports to be closed,close the ports and disconnect */
2766
2767 /* free private structure allocated for serial port *
2768 * stop reads and writes on all ports */
2769
2770 for (i = 0; i < serial->num_ports; ++i) {
2771 mos7840_port = mos7840_get_port_private(serial->port[i]);
2772 spin_lock_irqsave(&mos7840_port->pool_lock, flags);
2773 mos7840_port->zombie = 1;
2774 spin_unlock_irqrestore(&mos7840_port->pool_lock, flags);
2775 usb_kill_urb(mos7840_port->control_urb);
2776 kfree(mos7840_port->ctrl_buf);
2777 kfree(mos7840_port->dr);
2778 kfree(mos7840_port);
2779 mos7840_set_port_private(serial->port[i], NULL);
2780 }
2781
2782 dbg("%s\n", "Thank u :: ");
2783
2784 }
2785
2786 static struct usb_driver io_driver = {
2787 .name = "mos7840",
2788 .probe = usb_serial_probe,
2789 .disconnect = usb_serial_disconnect,
2790 .id_table = moschip_id_table_combined,
2791 .no_dynamic_id = 1,
2792 };
2793
2794 static struct usb_serial_driver moschip7840_4port_device = {
2795 .driver = {
2796 .owner = THIS_MODULE,
2797 .name = "mos7840",
2798 },
2799 .description = DRIVER_DESC,
2800 .usb_driver = &io_driver,
2801 .id_table = moschip_port_id_table,
2802 .num_ports = 4,
2803 .open = mos7840_open,
2804 .close = mos7840_close,
2805 .write = mos7840_write,
2806 .write_room = mos7840_write_room,
2807 .chars_in_buffer = mos7840_chars_in_buffer,
2808 .throttle = mos7840_throttle,
2809 .unthrottle = mos7840_unthrottle,
2810 .calc_num_ports = mos7840_calc_num_ports,
2811 #ifdef MCSSerialProbe
2812 .probe = mos7840_serial_probe,
2813 #endif
2814 .ioctl = mos7840_ioctl,
2815 .set_termios = mos7840_set_termios,
2816 .break_ctl = mos7840_break,
2817 .tiocmget = mos7840_tiocmget,
2818 .tiocmset = mos7840_tiocmset,
2819 .attach = mos7840_startup,
2820 .shutdown = mos7840_shutdown,
2821 .read_bulk_callback = mos7840_bulk_in_callback,
2822 .read_int_callback = mos7840_interrupt_callback,
2823 };
2824
2825 /****************************************************************************
2826 * moschip7840_init
2827 * This is called by the module subsystem, or on startup to initialize us
2828 ****************************************************************************/
2829 static int __init moschip7840_init(void)
2830 {
2831 int retval;
2832
2833 dbg("%s \n", " mos7840_init :entering..........");
2834
2835 /* Register with the usb serial */
2836 retval = usb_serial_register(&moschip7840_4port_device);
2837
2838 if (retval)
2839 goto failed_port_device_register;
2840
2841 dbg("%s\n", "Entring...");
2842 info(DRIVER_DESC " " DRIVER_VERSION);
2843
2844 /* Register with the usb */
2845 retval = usb_register(&io_driver);
2846
2847 if (retval)
2848 goto failed_usb_register;
2849
2850 if (retval == 0) {
2851 dbg("%s\n", "Leaving...");
2852 return 0;
2853 }
2854
2855 failed_usb_register:
2856 usb_serial_deregister(&moschip7840_4port_device);
2857
2858 failed_port_device_register:
2859
2860 return retval;
2861 }
2862
2863 /****************************************************************************
2864 * moschip7840_exit
2865 * Called when the driver is about to be unloaded.
2866 ****************************************************************************/
2867 static void __exit moschip7840_exit(void)
2868 {
2869
2870 dbg("%s \n", " mos7840_exit :entering..........");
2871
2872 usb_deregister(&io_driver);
2873
2874 usb_serial_deregister(&moschip7840_4port_device);
2875
2876 dbg("%s\n", "Entring...");
2877 }
2878
2879 module_init(moschip7840_init);
2880 module_exit(moschip7840_exit);
2881
2882 /* Module information */
2883 MODULE_DESCRIPTION(DRIVER_DESC);
2884 MODULE_LICENSE("GPL");
2885
2886 module_param(debug, bool, S_IRUGO | S_IWUSR);
2887 MODULE_PARM_DESC(debug, "Debug enabled or not");
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