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USB: fix mos7840 problem with minor numbers
[deliverable/linux.git] / drivers / usb / serial / mos7840.c
1 /*
2 * This program is free software; you can redistribute it and/or modify
3 * it under the terms of the GNU General Public License as published by
4 * the Free Software Foundation; either version 2 of the License, or
5 * (at your option) any later version.
6 *
7 * This program is distributed in the hope that it will be useful,
8 * but WITHOUT ANY WARRANTY; without even the implied warranty of
9 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
10 * GNU General Public License for more details.
11 *
12 * You should have received a copy of the GNU General Public License
13 * along with this program; if not, write to the Free Software
14 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
15 *
16 * Clean ups from Moschip version and a few ioctl implementations by:
17 * Paul B Schroeder <pschroeder "at" uplogix "dot" com>
18 *
19 * Originally based on drivers/usb/serial/io_edgeport.c which is:
20 * Copyright (C) 2000 Inside Out Networks, All rights reserved.
21 * Copyright (C) 2001-2002 Greg Kroah-Hartman <greg@kroah.com>
22 *
23 */
24
25 #include <linux/kernel.h>
26 #include <linux/errno.h>
27 #include <linux/init.h>
28 #include <linux/slab.h>
29 #include <linux/tty.h>
30 #include <linux/tty_driver.h>
31 #include <linux/tty_flip.h>
32 #include <linux/module.h>
33 #include <linux/serial.h>
34 #include <linux/usb.h>
35 #include <linux/usb/serial.h>
36 #include <linux/uaccess.h>
37
38 /*
39 * Version Information
40 */
41 #define DRIVER_VERSION "1.3.2"
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 /* This driver also supports the ATEN UC2324 device since it is mos7840 based
127 * - if I knew the device id it would also support the ATEN UC2322 */
128 #define USB_VENDOR_ID_ATENINTL 0x0557
129 #define ATENINTL_DEVICE_ID_UC2324 0x2011
130
131 /* Interrupt Routine Defines */
132
133 #define SERIAL_IIR_RLS 0x06
134 #define SERIAL_IIR_MS 0x00
135
136 /*
137 * Emulation of the bit mask on the LINE STATUS REGISTER.
138 */
139 #define SERIAL_LSR_DR 0x0001
140 #define SERIAL_LSR_OE 0x0002
141 #define SERIAL_LSR_PE 0x0004
142 #define SERIAL_LSR_FE 0x0008
143 #define SERIAL_LSR_BI 0x0010
144
145 #define MOS_MSR_DELTA_CTS 0x10
146 #define MOS_MSR_DELTA_DSR 0x20
147 #define MOS_MSR_DELTA_RI 0x40
148 #define MOS_MSR_DELTA_CD 0x80
149
150 /* Serial Port register Address */
151 #define INTERRUPT_ENABLE_REGISTER ((__u16)(0x01))
152 #define FIFO_CONTROL_REGISTER ((__u16)(0x02))
153 #define LINE_CONTROL_REGISTER ((__u16)(0x03))
154 #define MODEM_CONTROL_REGISTER ((__u16)(0x04))
155 #define LINE_STATUS_REGISTER ((__u16)(0x05))
156 #define MODEM_STATUS_REGISTER ((__u16)(0x06))
157 #define SCRATCH_PAD_REGISTER ((__u16)(0x07))
158 #define DIVISOR_LATCH_LSB ((__u16)(0x00))
159 #define DIVISOR_LATCH_MSB ((__u16)(0x01))
160
161 #define CLK_MULTI_REGISTER ((__u16)(0x02))
162 #define CLK_START_VALUE_REGISTER ((__u16)(0x03))
163
164 #define SERIAL_LCR_DLAB ((__u16)(0x0080))
165
166 /*
167 * URB POOL related defines
168 */
169 #define NUM_URBS 16 /* URB Count */
170 #define URB_TRANSFER_BUFFER_SIZE 32 /* URB Size */
171
172
173 static struct usb_device_id moschip_port_id_table[] = {
174 {USB_DEVICE(USB_VENDOR_ID_MOSCHIP, MOSCHIP_DEVICE_ID_7840)},
175 {USB_DEVICE(USB_VENDOR_ID_MOSCHIP, MOSCHIP_DEVICE_ID_7820)},
176 {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USOPTL4_4)},
177 {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USOPTL4_2)},
178 {USB_DEVICE(USB_VENDOR_ID_ATENINTL, ATENINTL_DEVICE_ID_UC2324)},
179 {} /* terminating entry */
180 };
181
182 static __devinitdata struct usb_device_id moschip_id_table_combined[] = {
183 {USB_DEVICE(USB_VENDOR_ID_MOSCHIP, MOSCHIP_DEVICE_ID_7840)},
184 {USB_DEVICE(USB_VENDOR_ID_MOSCHIP, MOSCHIP_DEVICE_ID_7820)},
185 {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USOPTL4_4)},
186 {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USOPTL4_2)},
187 {USB_DEVICE(USB_VENDOR_ID_ATENINTL, ATENINTL_DEVICE_ID_UC2324)},
188 {} /* terminating entry */
189 };
190
191 MODULE_DEVICE_TABLE(usb, moschip_id_table_combined);
192
193 /* This structure holds all of the local port information */
194
195 struct moschip_port {
196 int port_num; /*Actual port number in the device(1,2,etc) */
197 struct urb *write_urb; /* write URB for this port */
198 struct urb *read_urb; /* read URB for this port */
199 struct urb *int_urb;
200 __u8 shadowLCR; /* last LCR value received */
201 __u8 shadowMCR; /* last MCR value received */
202 char open;
203 char open_ports;
204 char zombie;
205 wait_queue_head_t wait_chase; /* for handling sleeping while waiting for chase to finish */
206 wait_queue_head_t delta_msr_wait; /* for handling sleeping while waiting for msr change to happen */
207 int delta_msr_cond;
208 struct async_icount icount;
209 struct usb_serial_port *port; /* loop back to the owner of this object */
210
211 /* Offsets */
212 __u8 SpRegOffset;
213 __u8 ControlRegOffset;
214 __u8 DcrRegOffset;
215 /* for processing control URBS in interrupt context */
216 struct urb *control_urb;
217 struct usb_ctrlrequest *dr;
218 char *ctrl_buf;
219 int MsrLsr;
220
221 spinlock_t pool_lock;
222 struct urb *write_urb_pool[NUM_URBS];
223 char busy[NUM_URBS];
224 bool read_urb_busy;
225 };
226
227
228 static int debug;
229
230 /*
231 * mos7840_set_reg_sync
232 * To set the Control register by calling usb_fill_control_urb function
233 * by passing usb_sndctrlpipe function as parameter.
234 */
235
236 static int mos7840_set_reg_sync(struct usb_serial_port *port, __u16 reg,
237 __u16 val)
238 {
239 struct usb_device *dev = port->serial->dev;
240 val = val & 0x00ff;
241 dbg("mos7840_set_reg_sync offset is %x, value %x\n", reg, val);
242
243 return usb_control_msg(dev, usb_sndctrlpipe(dev, 0), MCS_WRREQ,
244 MCS_WR_RTYPE, val, reg, NULL, 0,
245 MOS_WDR_TIMEOUT);
246 }
247
248 /*
249 * mos7840_get_reg_sync
250 * To set the Uart register by calling usb_fill_control_urb function by
251 * passing usb_rcvctrlpipe function as parameter.
252 */
253
254 static int mos7840_get_reg_sync(struct usb_serial_port *port, __u16 reg,
255 __u16 *val)
256 {
257 struct usb_device *dev = port->serial->dev;
258 int ret = 0;
259
260 ret = usb_control_msg(dev, usb_rcvctrlpipe(dev, 0), MCS_RDREQ,
261 MCS_RD_RTYPE, 0, reg, val, VENDOR_READ_LENGTH,
262 MOS_WDR_TIMEOUT);
263 dbg("mos7840_get_reg_sync offset is %x, return val %x\n", reg, *val);
264 *val = (*val) & 0x00ff;
265 return ret;
266 }
267
268 /*
269 * mos7840_set_uart_reg
270 * To set the Uart register by calling usb_fill_control_urb function by
271 * passing usb_sndctrlpipe function as parameter.
272 */
273
274 static int mos7840_set_uart_reg(struct usb_serial_port *port, __u16 reg,
275 __u16 val)
276 {
277
278 struct usb_device *dev = port->serial->dev;
279 val = val & 0x00ff;
280 /* For the UART control registers, the application number need
281 to be Or'ed */
282 if (port->serial->num_ports == 4) {
283 val |= (((__u16) port->number -
284 (__u16) (port->serial->minor)) + 1) << 8;
285 dbg("mos7840_set_uart_reg application number is %x\n", val);
286 } else {
287 if (((__u16) port->number - (__u16) (port->serial->minor)) == 0) {
288 val |= (((__u16) port->number -
289 (__u16) (port->serial->minor)) + 1) << 8;
290 dbg("mos7840_set_uart_reg application number is %x\n",
291 val);
292 } else {
293 val |=
294 (((__u16) port->number -
295 (__u16) (port->serial->minor)) + 2) << 8;
296 dbg("mos7840_set_uart_reg application number is %x\n",
297 val);
298 }
299 }
300 return usb_control_msg(dev, usb_sndctrlpipe(dev, 0), MCS_WRREQ,
301 MCS_WR_RTYPE, val, reg, NULL, 0,
302 MOS_WDR_TIMEOUT);
303
304 }
305
306 /*
307 * mos7840_get_uart_reg
308 * To set the Control register by calling usb_fill_control_urb function
309 * by passing usb_rcvctrlpipe function as parameter.
310 */
311 static int mos7840_get_uart_reg(struct usb_serial_port *port, __u16 reg,
312 __u16 *val)
313 {
314 struct usb_device *dev = port->serial->dev;
315 int ret = 0;
316 __u16 Wval;
317
318 /* dbg("application number is %4x \n",
319 (((__u16)port->number - (__u16)(port->serial->minor))+1)<<8); */
320 /* Wval is same as application number */
321 if (port->serial->num_ports == 4) {
322 Wval =
323 (((__u16) port->number - (__u16) (port->serial->minor)) +
324 1) << 8;
325 dbg("mos7840_get_uart_reg application number is %x\n", Wval);
326 } else {
327 if (((__u16) port->number - (__u16) (port->serial->minor)) == 0) {
328 Wval = (((__u16) port->number -
329 (__u16) (port->serial->minor)) + 1) << 8;
330 dbg("mos7840_get_uart_reg application number is %x\n",
331 Wval);
332 } else {
333 Wval = (((__u16) port->number -
334 (__u16) (port->serial->minor)) + 2) << 8;
335 dbg("mos7840_get_uart_reg application number is %x\n",
336 Wval);
337 }
338 }
339 ret = usb_control_msg(dev, usb_rcvctrlpipe(dev, 0), MCS_RDREQ,
340 MCS_RD_RTYPE, Wval, reg, val, VENDOR_READ_LENGTH,
341 MOS_WDR_TIMEOUT);
342 *val = (*val) & 0x00ff;
343 return ret;
344 }
345
346 static void mos7840_dump_serial_port(struct moschip_port *mos7840_port)
347 {
348
349 dbg("***************************************\n");
350 dbg("SpRegOffset is %2x\n", mos7840_port->SpRegOffset);
351 dbg("ControlRegOffset is %2x \n", mos7840_port->ControlRegOffset);
352 dbg("DCRRegOffset is %2x \n", mos7840_port->DcrRegOffset);
353 dbg("***************************************\n");
354
355 }
356
357 /************************************************************************/
358 /************************************************************************/
359 /* I N T E R F A C E F U N C T I O N S */
360 /* I N T E R F A C E F U N C T I O N S */
361 /************************************************************************/
362 /************************************************************************/
363
364 static inline void mos7840_set_port_private(struct usb_serial_port *port,
365 struct moschip_port *data)
366 {
367 usb_set_serial_port_data(port, (void *)data);
368 }
369
370 static inline struct moschip_port *mos7840_get_port_private(struct
371 usb_serial_port
372 *port)
373 {
374 return (struct moschip_port *)usb_get_serial_port_data(port);
375 }
376
377 static void mos7840_handle_new_msr(struct moschip_port *port, __u8 new_msr)
378 {
379 struct moschip_port *mos7840_port;
380 struct async_icount *icount;
381 mos7840_port = port;
382 icount = &mos7840_port->icount;
383 if (new_msr &
384 (MOS_MSR_DELTA_CTS | MOS_MSR_DELTA_DSR | MOS_MSR_DELTA_RI |
385 MOS_MSR_DELTA_CD)) {
386 icount = &mos7840_port->icount;
387
388 /* update input line counters */
389 if (new_msr & MOS_MSR_DELTA_CTS) {
390 icount->cts++;
391 smp_wmb();
392 }
393 if (new_msr & MOS_MSR_DELTA_DSR) {
394 icount->dsr++;
395 smp_wmb();
396 }
397 if (new_msr & MOS_MSR_DELTA_CD) {
398 icount->dcd++;
399 smp_wmb();
400 }
401 if (new_msr & MOS_MSR_DELTA_RI) {
402 icount->rng++;
403 smp_wmb();
404 }
405 }
406 }
407
408 static void mos7840_handle_new_lsr(struct moschip_port *port, __u8 new_lsr)
409 {
410 struct async_icount *icount;
411
412 dbg("%s - %02x", __func__, new_lsr);
413
414 if (new_lsr & SERIAL_LSR_BI) {
415 /*
416 * Parity and Framing errors only count if they
417 * occur exclusive of a break being
418 * received.
419 */
420 new_lsr &= (__u8) (SERIAL_LSR_OE | SERIAL_LSR_BI);
421 }
422
423 /* update input line counters */
424 icount = &port->icount;
425 if (new_lsr & SERIAL_LSR_BI) {
426 icount->brk++;
427 smp_wmb();
428 }
429 if (new_lsr & SERIAL_LSR_OE) {
430 icount->overrun++;
431 smp_wmb();
432 }
433 if (new_lsr & SERIAL_LSR_PE) {
434 icount->parity++;
435 smp_wmb();
436 }
437 if (new_lsr & SERIAL_LSR_FE) {
438 icount->frame++;
439 smp_wmb();
440 }
441 }
442
443 /************************************************************************/
444 /************************************************************************/
445 /* U S B C A L L B A C K F U N C T I O N S */
446 /* U S B C A L L B A C K F U N C T I O N S */
447 /************************************************************************/
448 /************************************************************************/
449
450 static void mos7840_control_callback(struct urb *urb)
451 {
452 unsigned char *data;
453 struct moschip_port *mos7840_port;
454 __u8 regval = 0x0;
455 int result = 0;
456 int status = urb->status;
457
458 mos7840_port = urb->context;
459
460 switch (status) {
461 case 0:
462 /* success */
463 break;
464 case -ECONNRESET:
465 case -ENOENT:
466 case -ESHUTDOWN:
467 /* this urb is terminated, clean up */
468 dbg("%s - urb shutting down with status: %d", __func__,
469 status);
470 return;
471 default:
472 dbg("%s - nonzero urb status received: %d", __func__,
473 status);
474 goto exit;
475 }
476
477 dbg("%s urb buffer size is %d\n", __func__, urb->actual_length);
478 dbg("%s mos7840_port->MsrLsr is %d port %d\n", __func__,
479 mos7840_port->MsrLsr, mos7840_port->port_num);
480 data = urb->transfer_buffer;
481 regval = (__u8) data[0];
482 dbg("%s data is %x\n", __func__, regval);
483 if (mos7840_port->MsrLsr == 0)
484 mos7840_handle_new_msr(mos7840_port, regval);
485 else if (mos7840_port->MsrLsr == 1)
486 mos7840_handle_new_lsr(mos7840_port, regval);
487
488 exit:
489 spin_lock(&mos7840_port->pool_lock);
490 if (!mos7840_port->zombie)
491 result = usb_submit_urb(mos7840_port->int_urb, GFP_ATOMIC);
492 spin_unlock(&mos7840_port->pool_lock);
493 if (result) {
494 dev_err(&urb->dev->dev,
495 "%s - Error %d submitting interrupt urb\n",
496 __func__, result);
497 }
498 }
499
500 static int mos7840_get_reg(struct moschip_port *mcs, __u16 Wval, __u16 reg,
501 __u16 *val)
502 {
503 struct usb_device *dev = mcs->port->serial->dev;
504 struct usb_ctrlrequest *dr = mcs->dr;
505 unsigned char *buffer = mcs->ctrl_buf;
506 int ret;
507
508 dr->bRequestType = MCS_RD_RTYPE;
509 dr->bRequest = MCS_RDREQ;
510 dr->wValue = cpu_to_le16(Wval); /* 0 */
511 dr->wIndex = cpu_to_le16(reg);
512 dr->wLength = cpu_to_le16(2);
513
514 usb_fill_control_urb(mcs->control_urb, dev, usb_rcvctrlpipe(dev, 0),
515 (unsigned char *)dr, buffer, 2,
516 mos7840_control_callback, mcs);
517 mcs->control_urb->transfer_buffer_length = 2;
518 ret = usb_submit_urb(mcs->control_urb, GFP_ATOMIC);
519 return ret;
520 }
521
522 /*****************************************************************************
523 * mos7840_interrupt_callback
524 * this is the callback function for when we have received data on the
525 * interrupt endpoint.
526 *****************************************************************************/
527
528 static void mos7840_interrupt_callback(struct urb *urb)
529 {
530 int result;
531 int length;
532 struct moschip_port *mos7840_port;
533 struct usb_serial *serial;
534 __u16 Data;
535 unsigned char *data;
536 __u8 sp[5], st;
537 int i, rv = 0;
538 __u16 wval, wreg = 0;
539 int status = urb->status;
540
541 dbg("%s", " : Entering\n");
542
543 switch (status) {
544 case 0:
545 /* success */
546 break;
547 case -ECONNRESET:
548 case -ENOENT:
549 case -ESHUTDOWN:
550 /* this urb is terminated, clean up */
551 dbg("%s - urb shutting down with status: %d", __func__,
552 status);
553 return;
554 default:
555 dbg("%s - nonzero urb status received: %d", __func__,
556 status);
557 goto exit;
558 }
559
560 length = urb->actual_length;
561 data = urb->transfer_buffer;
562
563 serial = urb->context;
564
565 /* Moschip get 5 bytes
566 * Byte 1 IIR Port 1 (port.number is 0)
567 * Byte 2 IIR Port 2 (port.number is 1)
568 * Byte 3 IIR Port 3 (port.number is 2)
569 * Byte 4 IIR Port 4 (port.number is 3)
570 * Byte 5 FIFO status for both */
571
572 if (length && length > 5) {
573 dbg("%s \n", "Wrong data !!!");
574 return;
575 }
576
577 sp[0] = (__u8) data[0];
578 sp[1] = (__u8) data[1];
579 sp[2] = (__u8) data[2];
580 sp[3] = (__u8) data[3];
581 st = (__u8) data[4];
582
583 for (i = 0; i < serial->num_ports; i++) {
584 mos7840_port = mos7840_get_port_private(serial->port[i]);
585 wval =
586 (((__u16) serial->port[i]->number -
587 (__u16) (serial->minor)) + 1) << 8;
588 if (mos7840_port->open) {
589 if (sp[i] & 0x01) {
590 dbg("SP%d No Interrupt !!!\n", i);
591 } else {
592 switch (sp[i] & 0x0f) {
593 case SERIAL_IIR_RLS:
594 dbg("Serial Port %d: Receiver status error or ", i);
595 dbg("address bit detected in 9-bit mode\n");
596 mos7840_port->MsrLsr = 1;
597 wreg = LINE_STATUS_REGISTER;
598 break;
599 case SERIAL_IIR_MS:
600 dbg("Serial Port %d: Modem status change\n", i);
601 mos7840_port->MsrLsr = 0;
602 wreg = MODEM_STATUS_REGISTER;
603 break;
604 }
605 spin_lock(&mos7840_port->pool_lock);
606 if (!mos7840_port->zombie) {
607 rv = mos7840_get_reg(mos7840_port, wval, wreg, &Data);
608 } else {
609 spin_unlock(&mos7840_port->pool_lock);
610 return;
611 }
612 spin_unlock(&mos7840_port->pool_lock);
613 }
614 }
615 }
616 if (!(rv < 0))
617 /* the completion handler for the control urb will resubmit */
618 return;
619 exit:
620 result = usb_submit_urb(urb, GFP_ATOMIC);
621 if (result) {
622 dev_err(&urb->dev->dev,
623 "%s - Error %d submitting interrupt urb\n",
624 __func__, result);
625 }
626 }
627
628 static int mos7840_port_paranoia_check(struct usb_serial_port *port,
629 const char *function)
630 {
631 if (!port) {
632 dbg("%s - port == NULL", function);
633 return -1;
634 }
635 if (!port->serial) {
636 dbg("%s - port->serial == NULL", function);
637 return -1;
638 }
639
640 return 0;
641 }
642
643 /* Inline functions to check the sanity of a pointer that is passed to us */
644 static int mos7840_serial_paranoia_check(struct usb_serial *serial,
645 const char *function)
646 {
647 if (!serial) {
648 dbg("%s - serial == NULL", function);
649 return -1;
650 }
651 if (!serial->type) {
652 dbg("%s - serial->type == NULL!", function);
653 return -1;
654 }
655
656 return 0;
657 }
658
659 static struct usb_serial *mos7840_get_usb_serial(struct usb_serial_port *port,
660 const char *function)
661 {
662 /* if no port was specified, or it fails a paranoia check */
663 if (!port ||
664 mos7840_port_paranoia_check(port, function) ||
665 mos7840_serial_paranoia_check(port->serial, function)) {
666 /* then say that we don't have a valid usb_serial thing,
667 * which will end up genrating -ENODEV return values */
668 return NULL;
669 }
670
671 return port->serial;
672 }
673
674 /*****************************************************************************
675 * mos7840_bulk_in_callback
676 * this is the callback function for when we have received data on the
677 * bulk in endpoint.
678 *****************************************************************************/
679
680 static void mos7840_bulk_in_callback(struct urb *urb)
681 {
682 int retval;
683 unsigned char *data;
684 struct usb_serial *serial;
685 struct usb_serial_port *port;
686 struct moschip_port *mos7840_port;
687 struct tty_struct *tty;
688 int status = urb->status;
689
690 mos7840_port = urb->context;
691 if (!mos7840_port) {
692 dbg("%s", "NULL mos7840_port pointer \n");
693 mos7840_port->read_urb_busy = false;
694 return;
695 }
696
697 if (status) {
698 dbg("nonzero read bulk status received: %d", status);
699 mos7840_port->read_urb_busy = false;
700 return;
701 }
702
703 port = (struct usb_serial_port *)mos7840_port->port;
704 if (mos7840_port_paranoia_check(port, __func__)) {
705 dbg("%s", "Port Paranoia failed \n");
706 mos7840_port->read_urb_busy = false;
707 return;
708 }
709
710 serial = mos7840_get_usb_serial(port, __func__);
711 if (!serial) {
712 dbg("%s\n", "Bad serial pointer ");
713 mos7840_port->read_urb_busy = false;
714 return;
715 }
716
717 dbg("%s\n", "Entering... \n");
718
719 data = urb->transfer_buffer;
720
721 dbg("%s", "Entering ........... \n");
722
723 if (urb->actual_length) {
724 tty = tty_port_tty_get(&mos7840_port->port->port);
725 if (tty) {
726 tty_buffer_request_room(tty, urb->actual_length);
727 tty_insert_flip_string(tty, data, urb->actual_length);
728 dbg(" %s \n", data);
729 tty_flip_buffer_push(tty);
730 tty_kref_put(tty);
731 }
732 mos7840_port->icount.rx += urb->actual_length;
733 smp_wmb();
734 dbg("mos7840_port->icount.rx is %d:\n",
735 mos7840_port->icount.rx);
736 }
737
738 if (!mos7840_port->read_urb) {
739 dbg("%s", "URB KILLED !!!\n");
740 mos7840_port->read_urb_busy = false;
741 return;
742 }
743
744
745 mos7840_port->read_urb->dev = serial->dev;
746
747 mos7840_port->read_urb_busy = true;
748 retval = usb_submit_urb(mos7840_port->read_urb, GFP_ATOMIC);
749
750 if (retval) {
751 dbg("usb_submit_urb(read bulk) failed, retval = %d", retval);
752 mos7840_port->read_urb_busy = false;
753 }
754 }
755
756 /*****************************************************************************
757 * mos7840_bulk_out_data_callback
758 * this is the callback function for when we have finished sending
759 * serial data on the bulk out endpoint.
760 *****************************************************************************/
761
762 static void mos7840_bulk_out_data_callback(struct urb *urb)
763 {
764 struct moschip_port *mos7840_port;
765 struct tty_struct *tty;
766 int status = urb->status;
767 int i;
768
769 mos7840_port = urb->context;
770 spin_lock(&mos7840_port->pool_lock);
771 for (i = 0; i < NUM_URBS; i++) {
772 if (urb == mos7840_port->write_urb_pool[i]) {
773 mos7840_port->busy[i] = 0;
774 break;
775 }
776 }
777 spin_unlock(&mos7840_port->pool_lock);
778
779 if (status) {
780 dbg("nonzero write bulk status received:%d\n", status);
781 return;
782 }
783
784 if (mos7840_port_paranoia_check(mos7840_port->port, __func__)) {
785 dbg("%s", "Port Paranoia failed \n");
786 return;
787 }
788
789 dbg("%s \n", "Entering .........");
790
791 tty = tty_port_tty_get(&mos7840_port->port->port);
792 if (tty && mos7840_port->open)
793 tty_wakeup(tty);
794 tty_kref_put(tty);
795
796 }
797
798 /************************************************************************/
799 /* 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 */
800 /************************************************************************/
801 #ifdef MCSSerialProbe
802 static int mos7840_serial_probe(struct usb_serial *serial,
803 const struct usb_device_id *id)
804 {
805
806 /*need to implement the mode_reg reading and updating\
807 structures usb_serial_ device_type\
808 (i.e num_ports, num_bulkin,bulkout etc) */
809 /* Also we can update the changes attach */
810 return 1;
811 }
812 #endif
813
814 /*****************************************************************************
815 * mos7840_open
816 * this function is called by the tty driver when a port is opened
817 * If successful, we return 0
818 * Otherwise we return a negative error number.
819 *****************************************************************************/
820
821 static int mos7840_open(struct tty_struct *tty,
822 struct usb_serial_port *port, struct file *filp)
823 {
824 int response;
825 int j;
826 struct usb_serial *serial;
827 struct urb *urb;
828 __u16 Data;
829 int status;
830 struct moschip_port *mos7840_port;
831 struct moschip_port *port0;
832
833 if (mos7840_port_paranoia_check(port, __func__)) {
834 dbg("%s", "Port Paranoia failed \n");
835 return -ENODEV;
836 }
837
838 serial = port->serial;
839
840 if (mos7840_serial_paranoia_check(serial, __func__)) {
841 dbg("%s", "Serial Paranoia failed \n");
842 return -ENODEV;
843 }
844
845 mos7840_port = mos7840_get_port_private(port);
846 port0 = mos7840_get_port_private(serial->port[0]);
847
848 if (mos7840_port == NULL || port0 == NULL)
849 return -ENODEV;
850
851 usb_clear_halt(serial->dev, port->write_urb->pipe);
852 usb_clear_halt(serial->dev, port->read_urb->pipe);
853 port0->open_ports++;
854
855 /* Initialising the write urb pool */
856 for (j = 0; j < NUM_URBS; ++j) {
857 urb = usb_alloc_urb(0, GFP_KERNEL);
858 mos7840_port->write_urb_pool[j] = urb;
859
860 if (urb == NULL) {
861 dev_err(&port->dev, "No more urbs???\n");
862 continue;
863 }
864
865 urb->transfer_buffer = kmalloc(URB_TRANSFER_BUFFER_SIZE,
866 GFP_KERNEL);
867 if (!urb->transfer_buffer) {
868 usb_free_urb(urb);
869 mos7840_port->write_urb_pool[j] = NULL;
870 dev_err(&port->dev,
871 "%s-out of memory for urb buffers.\n",
872 __func__);
873 continue;
874 }
875 }
876
877 /*****************************************************************************
878 * Initialize MCS7840 -- Write Init values to corresponding Registers
879 *
880 * Register Index
881 * 1 : IER
882 * 2 : FCR
883 * 3 : LCR
884 * 4 : MCR
885 *
886 * 0x08 : SP1/2 Control Reg
887 *****************************************************************************/
888
889 /* NEED to check the following Block */
890
891 Data = 0x0;
892 status = mos7840_get_reg_sync(port, mos7840_port->SpRegOffset, &Data);
893 if (status < 0) {
894 dbg("Reading Spreg failed\n");
895 return -1;
896 }
897 Data |= 0x80;
898 status = mos7840_set_reg_sync(port, mos7840_port->SpRegOffset, Data);
899 if (status < 0) {
900 dbg("writing Spreg failed\n");
901 return -1;
902 }
903
904 Data &= ~0x80;
905 status = mos7840_set_reg_sync(port, mos7840_port->SpRegOffset, Data);
906 if (status < 0) {
907 dbg("writing Spreg failed\n");
908 return -1;
909 }
910 /* End of block to be checked */
911
912 Data = 0x0;
913 status = mos7840_get_reg_sync(port, mos7840_port->ControlRegOffset,
914 &Data);
915 if (status < 0) {
916 dbg("Reading Controlreg failed\n");
917 return -1;
918 }
919 Data |= 0x08; /* Driver done bit */
920 Data |= 0x20; /* rx_disable */
921 status = mos7840_set_reg_sync(port,
922 mos7840_port->ControlRegOffset, Data);
923 if (status < 0) {
924 dbg("writing Controlreg failed\n");
925 return -1;
926 }
927 /* do register settings here */
928 /* Set all regs to the device default values. */
929 /***********************************
930 * First Disable all interrupts.
931 ***********************************/
932 Data = 0x00;
933 status = mos7840_set_uart_reg(port, INTERRUPT_ENABLE_REGISTER, Data);
934 if (status < 0) {
935 dbg("disableing interrupts failed\n");
936 return -1;
937 }
938 /* Set FIFO_CONTROL_REGISTER to the default value */
939 Data = 0x00;
940 status = mos7840_set_uart_reg(port, FIFO_CONTROL_REGISTER, Data);
941 if (status < 0) {
942 dbg("Writing FIFO_CONTROL_REGISTER failed\n");
943 return -1;
944 }
945
946 Data = 0xcf;
947 status = mos7840_set_uart_reg(port, FIFO_CONTROL_REGISTER, Data);
948 if (status < 0) {
949 dbg("Writing FIFO_CONTROL_REGISTER failed\n");
950 return -1;
951 }
952
953 Data = 0x03;
954 status = mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data);
955 mos7840_port->shadowLCR = Data;
956
957 Data = 0x0b;
958 status = mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER, Data);
959 mos7840_port->shadowMCR = Data;
960
961 Data = 0x00;
962 status = mos7840_get_uart_reg(port, LINE_CONTROL_REGISTER, &Data);
963 mos7840_port->shadowLCR = Data;
964
965 Data |= SERIAL_LCR_DLAB; /* data latch enable in LCR 0x80 */
966 status = mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data);
967
968 Data = 0x0c;
969 status = mos7840_set_uart_reg(port, DIVISOR_LATCH_LSB, Data);
970
971 Data = 0x0;
972 status = mos7840_set_uart_reg(port, DIVISOR_LATCH_MSB, Data);
973
974 Data = 0x00;
975 status = mos7840_get_uart_reg(port, LINE_CONTROL_REGISTER, &Data);
976
977 Data = Data & ~SERIAL_LCR_DLAB;
978 status = mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data);
979 mos7840_port->shadowLCR = Data;
980
981 /* clearing Bulkin and Bulkout Fifo */
982 Data = 0x0;
983 status = mos7840_get_reg_sync(port, mos7840_port->SpRegOffset, &Data);
984
985 Data = Data | 0x0c;
986 status = mos7840_set_reg_sync(port, mos7840_port->SpRegOffset, Data);
987
988 Data = Data & ~0x0c;
989 status = mos7840_set_reg_sync(port, mos7840_port->SpRegOffset, Data);
990 /* Finally enable all interrupts */
991 Data = 0x0c;
992 status = mos7840_set_uart_reg(port, INTERRUPT_ENABLE_REGISTER, Data);
993
994 /* clearing rx_disable */
995 Data = 0x0;
996 status = mos7840_get_reg_sync(port, mos7840_port->ControlRegOffset,
997 &Data);
998 Data = Data & ~0x20;
999 status = mos7840_set_reg_sync(port, mos7840_port->ControlRegOffset,
1000 Data);
1001
1002 /* rx_negate */
1003 Data = 0x0;
1004 status = mos7840_get_reg_sync(port, mos7840_port->ControlRegOffset,
1005 &Data);
1006 Data = Data | 0x10;
1007 status = mos7840_set_reg_sync(port, mos7840_port->ControlRegOffset,
1008 Data);
1009
1010 /* force low_latency on so that our tty_push actually forces *
1011 * the data through,otherwise it is scheduled, and with *
1012 * high data rates (like with OHCI) data can get lost. */
1013 if (tty)
1014 tty->low_latency = 1;
1015
1016 /* Check to see if we've set up our endpoint info yet *
1017 * (can't set it up in mos7840_startup as the structures *
1018 * were not set up at that time.) */
1019 if (port0->open_ports == 1) {
1020 if (serial->port[0]->interrupt_in_buffer == NULL) {
1021 /* set up interrupt urb */
1022 usb_fill_int_urb(serial->port[0]->interrupt_in_urb,
1023 serial->dev,
1024 usb_rcvintpipe(serial->dev,
1025 serial->port[0]->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->interval);
1032
1033 /* start interrupt read for mos7840 *
1034 * will continue as long as mos7840 is connected */
1035
1036 response =
1037 usb_submit_urb(serial->port[0]->interrupt_in_urb,
1038 GFP_KERNEL);
1039 if (response) {
1040 dev_err(&port->dev, "%s - Error %d submitting "
1041 "interrupt urb\n", __func__, response);
1042 }
1043
1044 }
1045
1046 }
1047
1048 /* see if we've set up our endpoint info yet *
1049 * (can't set it up in mos7840_startup as the *
1050 * structures were not set up at that time.) */
1051
1052 dbg("port number is %d \n", port->number);
1053 dbg("serial number is %d \n", port->serial->minor);
1054 dbg("Bulkin endpoint is %d \n", port->bulk_in_endpointAddress);
1055 dbg("BulkOut endpoint is %d \n", port->bulk_out_endpointAddress);
1056 dbg("Interrupt endpoint is %d \n", port->interrupt_in_endpointAddress);
1057 dbg("port's number in the device is %d\n", mos7840_port->port_num);
1058 mos7840_port->read_urb = port->read_urb;
1059
1060 /* set up our bulk in urb */
1061
1062 usb_fill_bulk_urb(mos7840_port->read_urb,
1063 serial->dev,
1064 usb_rcvbulkpipe(serial->dev,
1065 port->bulk_in_endpointAddress),
1066 port->bulk_in_buffer,
1067 mos7840_port->read_urb->transfer_buffer_length,
1068 mos7840_bulk_in_callback, mos7840_port);
1069
1070 dbg("mos7840_open: bulkin endpoint is %d\n",
1071 port->bulk_in_endpointAddress);
1072 mos7840_port->read_urb_busy = true;
1073 response = usb_submit_urb(mos7840_port->read_urb, GFP_KERNEL);
1074 if (response) {
1075 dev_err(&port->dev, "%s - Error %d submitting control urb\n",
1076 __func__, response);
1077 mos7840_port->read_urb_busy = false;
1078 }
1079
1080 /* initialize our wait queues */
1081 init_waitqueue_head(&mos7840_port->wait_chase);
1082 init_waitqueue_head(&mos7840_port->delta_msr_wait);
1083
1084 /* initialize our icount structure */
1085 memset(&(mos7840_port->icount), 0x00, sizeof(mos7840_port->icount));
1086
1087 /* initialize our port settings */
1088 /* Must set to enable ints! */
1089 mos7840_port->shadowMCR = MCR_MASTER_IE;
1090 /* send a open port command */
1091 mos7840_port->open = 1;
1092 /* mos7840_change_port_settings(mos7840_port,old_termios); */
1093 mos7840_port->icount.tx = 0;
1094 mos7840_port->icount.rx = 0;
1095
1096 dbg("\n\nusb_serial serial:%p mos7840_port:%p\n usb_serial_port port:%p\n\n",
1097 serial, mos7840_port, port);
1098
1099 return 0;
1100
1101 }
1102
1103 /*****************************************************************************
1104 * mos7840_chars_in_buffer
1105 * this function is called by the tty driver when it wants to know how many
1106 * bytes of data we currently have outstanding in the port (data that has
1107 * been written, but hasn't made it out the port yet)
1108 * If successful, we return the number of bytes left to be written in the
1109 * system,
1110 * Otherwise we return zero.
1111 *****************************************************************************/
1112
1113 static int mos7840_chars_in_buffer(struct tty_struct *tty)
1114 {
1115 struct usb_serial_port *port = tty->driver_data;
1116 int i;
1117 int chars = 0;
1118 unsigned long flags;
1119 struct moschip_port *mos7840_port;
1120
1121 dbg("%s \n", " mos7840_chars_in_buffer:entering ...........");
1122
1123 if (mos7840_port_paranoia_check(port, __func__)) {
1124 dbg("%s", "Invalid port \n");
1125 return 0;
1126 }
1127
1128 mos7840_port = mos7840_get_port_private(port);
1129 if (mos7840_port == NULL) {
1130 dbg("%s \n", "mos7840_break:leaving ...........");
1131 return 0;
1132 }
1133
1134 spin_lock_irqsave(&mos7840_port->pool_lock, flags);
1135 for (i = 0; i < NUM_URBS; ++i)
1136 if (mos7840_port->busy[i])
1137 chars += URB_TRANSFER_BUFFER_SIZE;
1138 spin_unlock_irqrestore(&mos7840_port->pool_lock, flags);
1139 dbg("%s - returns %d", __func__, chars);
1140 return chars;
1141
1142 }
1143
1144 /************************************************************************
1145 *
1146 * mos7840_block_until_tx_empty
1147 *
1148 * This function will block the close until one of the following:
1149 * 1. TX count are 0
1150 * 2. The mos7840 has stopped
1151 * 3. A timeout of 3 seconds without activity has expired
1152 *
1153 ************************************************************************/
1154 static void mos7840_block_until_tx_empty(struct tty_struct *tty,
1155 struct moschip_port *mos7840_port)
1156 {
1157 int timeout = HZ / 10;
1158 int wait = 30;
1159 int count;
1160
1161 while (1) {
1162
1163 count = mos7840_chars_in_buffer(tty);
1164
1165 /* Check for Buffer status */
1166 if (count <= 0)
1167 return;
1168
1169 /* Block the thread for a while */
1170 interruptible_sleep_on_timeout(&mos7840_port->wait_chase,
1171 timeout);
1172
1173 /* No activity.. count down section */
1174 wait--;
1175 if (wait == 0) {
1176 dbg("%s - TIMEOUT", __func__);
1177 return;
1178 } else {
1179 /* Reset timeout value back to seconds */
1180 wait = 30;
1181 }
1182 }
1183 }
1184
1185 /*****************************************************************************
1186 * mos7840_close
1187 * this function is called by the tty driver when a port is closed
1188 *****************************************************************************/
1189
1190 static void mos7840_close(struct tty_struct *tty,
1191 struct usb_serial_port *port, struct file *filp)
1192 {
1193 struct usb_serial *serial;
1194 struct moschip_port *mos7840_port;
1195 struct moschip_port *port0;
1196 int j;
1197 __u16 Data;
1198
1199 dbg("%s\n", "mos7840_close:entering...");
1200
1201 if (mos7840_port_paranoia_check(port, __func__)) {
1202 dbg("%s", "Port Paranoia failed \n");
1203 return;
1204 }
1205
1206 serial = mos7840_get_usb_serial(port, __func__);
1207 if (!serial) {
1208 dbg("%s", "Serial Paranoia failed \n");
1209 return;
1210 }
1211
1212 mos7840_port = mos7840_get_port_private(port);
1213 port0 = mos7840_get_port_private(serial->port[0]);
1214
1215 if (mos7840_port == NULL || port0 == NULL)
1216 return;
1217
1218 for (j = 0; j < NUM_URBS; ++j)
1219 usb_kill_urb(mos7840_port->write_urb_pool[j]);
1220
1221 /* Freeing Write URBs */
1222 for (j = 0; j < NUM_URBS; ++j) {
1223 if (mos7840_port->write_urb_pool[j]) {
1224 if (mos7840_port->write_urb_pool[j]->transfer_buffer)
1225 kfree(mos7840_port->write_urb_pool[j]->
1226 transfer_buffer);
1227
1228 usb_free_urb(mos7840_port->write_urb_pool[j]);
1229 }
1230 }
1231
1232 if (serial->dev)
1233 /* flush and block until tx is empty */
1234 mos7840_block_until_tx_empty(tty, mos7840_port);
1235
1236 /* While closing port, shutdown all bulk read, write *
1237 * and interrupt read if they exists */
1238 if (serial->dev) {
1239 if (mos7840_port->write_urb) {
1240 dbg("%s", "Shutdown bulk write\n");
1241 usb_kill_urb(mos7840_port->write_urb);
1242 }
1243 if (mos7840_port->read_urb) {
1244 dbg("%s", "Shutdown bulk read\n");
1245 usb_kill_urb(mos7840_port->read_urb);
1246 mos7840_port->read_urb_busy = false;
1247 }
1248 if ((&mos7840_port->control_urb)) {
1249 dbg("%s", "Shutdown control read\n");
1250 /*/ usb_kill_urb (mos7840_port->control_urb); */
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 if (mos7840_port->write_urb->transfer_buffer != NULL)
1268 kfree(mos7840_port->write_urb->transfer_buffer);
1269 usb_free_urb(mos7840_port->write_urb);
1270 }
1271
1272 Data = 0x0;
1273 mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER, Data);
1274
1275 Data = 0x00;
1276 mos7840_set_uart_reg(port, INTERRUPT_ENABLE_REGISTER, Data);
1277
1278 mos7840_port->open = 0;
1279
1280 dbg("%s \n", "Leaving ............");
1281 }
1282
1283 /************************************************************************
1284 *
1285 * mos7840_block_until_chase_response
1286 *
1287 * This function will block the close until one of the following:
1288 * 1. Response to our Chase comes from mos7840
1289 * 2. A timeout of 10 seconds without activity has expired
1290 * (1K of mos7840 data @ 2400 baud ==> 4 sec to empty)
1291 *
1292 ************************************************************************/
1293
1294 static void mos7840_block_until_chase_response(struct tty_struct *tty,
1295 struct moschip_port *mos7840_port)
1296 {
1297 int timeout = 1 * HZ;
1298 int wait = 10;
1299 int count;
1300
1301 while (1) {
1302 count = mos7840_chars_in_buffer(tty);
1303
1304 /* Check for Buffer status */
1305 if (count <= 0)
1306 return;
1307
1308 /* Block the thread for a while */
1309 interruptible_sleep_on_timeout(&mos7840_port->wait_chase,
1310 timeout);
1311 /* No activity.. count down section */
1312 wait--;
1313 if (wait == 0) {
1314 dbg("%s - TIMEOUT", __func__);
1315 return;
1316 } else {
1317 /* Reset timeout value back to seconds */
1318 wait = 10;
1319 }
1320 }
1321
1322 }
1323
1324 /*****************************************************************************
1325 * mos7840_break
1326 * this function sends a break to the port
1327 *****************************************************************************/
1328 static void mos7840_break(struct tty_struct *tty, int break_state)
1329 {
1330 struct usb_serial_port *port = tty->driver_data;
1331 unsigned char data;
1332 struct usb_serial *serial;
1333 struct moschip_port *mos7840_port;
1334
1335 dbg("%s \n", "Entering ...........");
1336 dbg("mos7840_break: Start\n");
1337
1338 if (mos7840_port_paranoia_check(port, __func__)) {
1339 dbg("%s", "Port Paranoia failed \n");
1340 return;
1341 }
1342
1343 serial = mos7840_get_usb_serial(port, __func__);
1344 if (!serial) {
1345 dbg("%s", "Serial Paranoia failed \n");
1346 return;
1347 }
1348
1349 mos7840_port = mos7840_get_port_private(port);
1350
1351 if (mos7840_port == NULL)
1352 return;
1353
1354 if (serial->dev)
1355 /* flush and block until tx is empty */
1356 mos7840_block_until_chase_response(tty, mos7840_port);
1357
1358 if (break_state == -1)
1359 data = mos7840_port->shadowLCR | LCR_SET_BREAK;
1360 else
1361 data = mos7840_port->shadowLCR & ~LCR_SET_BREAK;
1362
1363 /* FIXME: no locking on shadowLCR anywhere in driver */
1364 mos7840_port->shadowLCR = data;
1365 dbg("mcs7840_break mos7840_port->shadowLCR is %x\n",
1366 mos7840_port->shadowLCR);
1367 mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER,
1368 mos7840_port->shadowLCR);
1369
1370 return;
1371 }
1372
1373 /*****************************************************************************
1374 * mos7840_write_room
1375 * this function is called by the tty driver when it wants to know how many
1376 * bytes of data we can accept for a specific port.
1377 * If successful, we return the amount of room that we have for this port
1378 * Otherwise we return a negative error number.
1379 *****************************************************************************/
1380
1381 static int mos7840_write_room(struct tty_struct *tty)
1382 {
1383 struct usb_serial_port *port = tty->driver_data;
1384 int i;
1385 int room = 0;
1386 unsigned long flags;
1387 struct moschip_port *mos7840_port;
1388
1389 dbg("%s \n", " mos7840_write_room:entering ...........");
1390
1391 if (mos7840_port_paranoia_check(port, __func__)) {
1392 dbg("%s", "Invalid port \n");
1393 dbg("%s \n", " mos7840_write_room:leaving ...........");
1394 return -1;
1395 }
1396
1397 mos7840_port = mos7840_get_port_private(port);
1398 if (mos7840_port == NULL) {
1399 dbg("%s \n", "mos7840_break:leaving ...........");
1400 return -1;
1401 }
1402
1403 spin_lock_irqsave(&mos7840_port->pool_lock, flags);
1404 for (i = 0; i < NUM_URBS; ++i) {
1405 if (!mos7840_port->busy[i])
1406 room += URB_TRANSFER_BUFFER_SIZE;
1407 }
1408 spin_unlock_irqrestore(&mos7840_port->pool_lock, flags);
1409
1410 room = (room == 0) ? 0 : room - URB_TRANSFER_BUFFER_SIZE + 1;
1411 dbg("%s - returns %d", __func__, room);
1412 return room;
1413
1414 }
1415
1416 /*****************************************************************************
1417 * mos7840_write
1418 * this function is called by the tty driver when data should be written to
1419 * the port.
1420 * If successful, we return the number of bytes written, otherwise we
1421 * return a negative error number.
1422 *****************************************************************************/
1423
1424 static int mos7840_write(struct tty_struct *tty, struct usb_serial_port *port,
1425 const unsigned char *data, int count)
1426 {
1427 int status;
1428 int i;
1429 int bytes_sent = 0;
1430 int transfer_size;
1431 unsigned long flags;
1432
1433 struct moschip_port *mos7840_port;
1434 struct usb_serial *serial;
1435 struct urb *urb;
1436 /* __u16 Data; */
1437 const unsigned char *current_position = data;
1438 unsigned char *data1;
1439 dbg("%s \n", "entering ...........");
1440 /* dbg("mos7840_write: mos7840_port->shadowLCR is %x\n",
1441 mos7840_port->shadowLCR); */
1442
1443 #ifdef NOTMOS7840
1444 Data = 0x00;
1445 status = mos7840_get_uart_reg(port, LINE_CONTROL_REGISTER, &Data);
1446 mos7840_port->shadowLCR = Data;
1447 dbg("mos7840_write: LINE_CONTROL_REGISTER is %x\n", Data);
1448 dbg("mos7840_write: mos7840_port->shadowLCR is %x\n",
1449 mos7840_port->shadowLCR);
1450
1451 /* Data = 0x03; */
1452 /* status = mos7840_set_uart_reg(port,LINE_CONTROL_REGISTER,Data); */
1453 /* mos7840_port->shadowLCR=Data;//Need to add later */
1454
1455 Data |= SERIAL_LCR_DLAB; /* data latch enable in LCR 0x80 */
1456 status = mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data);
1457
1458 /* Data = 0x0c; */
1459 /* status = mos7840_set_uart_reg(port,DIVISOR_LATCH_LSB,Data); */
1460 Data = 0x00;
1461 status = mos7840_get_uart_reg(port, DIVISOR_LATCH_LSB, &Data);
1462 dbg("mos7840_write:DLL value is %x\n", Data);
1463
1464 Data = 0x0;
1465 status = mos7840_get_uart_reg(port, DIVISOR_LATCH_MSB, &Data);
1466 dbg("mos7840_write:DLM value is %x\n", Data);
1467
1468 Data = Data & ~SERIAL_LCR_DLAB;
1469 dbg("mos7840_write: mos7840_port->shadowLCR is %x\n",
1470 mos7840_port->shadowLCR);
1471 status = mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data);
1472 #endif
1473
1474 if (mos7840_port_paranoia_check(port, __func__)) {
1475 dbg("%s", "Port Paranoia failed \n");
1476 return -1;
1477 }
1478
1479 serial = port->serial;
1480 if (mos7840_serial_paranoia_check(serial, __func__)) {
1481 dbg("%s", "Serial Paranoia failed \n");
1482 return -1;
1483 }
1484
1485 mos7840_port = mos7840_get_port_private(port);
1486 if (mos7840_port == NULL) {
1487 dbg("%s", "mos7840_port is NULL\n");
1488 return -1;
1489 }
1490
1491 /* try to find a free urb in the list */
1492 urb = NULL;
1493
1494 spin_lock_irqsave(&mos7840_port->pool_lock, flags);
1495 for (i = 0; i < NUM_URBS; ++i) {
1496 if (!mos7840_port->busy[i]) {
1497 mos7840_port->busy[i] = 1;
1498 urb = mos7840_port->write_urb_pool[i];
1499 dbg("\nURB:%d", i);
1500 break;
1501 }
1502 }
1503 spin_unlock_irqrestore(&mos7840_port->pool_lock, flags);
1504
1505 if (urb == NULL) {
1506 dbg("%s - no more free urbs", __func__);
1507 goto exit;
1508 }
1509
1510 if (urb->transfer_buffer == NULL) {
1511 urb->transfer_buffer =
1512 kmalloc(URB_TRANSFER_BUFFER_SIZE, GFP_KERNEL);
1513
1514 if (urb->transfer_buffer == NULL) {
1515 dev_err(&port->dev, "%s no more kernel memory...\n",
1516 __func__);
1517 goto exit;
1518 }
1519 }
1520 transfer_size = min(count, URB_TRANSFER_BUFFER_SIZE);
1521
1522 memcpy(urb->transfer_buffer, current_position, transfer_size);
1523
1524 /* fill urb with data and submit */
1525 usb_fill_bulk_urb(urb,
1526 serial->dev,
1527 usb_sndbulkpipe(serial->dev,
1528 port->bulk_out_endpointAddress),
1529 urb->transfer_buffer,
1530 transfer_size,
1531 mos7840_bulk_out_data_callback, mos7840_port);
1532
1533 data1 = urb->transfer_buffer;
1534 dbg("\nbulkout endpoint is %d", port->bulk_out_endpointAddress);
1535
1536 /* send it down the pipe */
1537 status = usb_submit_urb(urb, GFP_ATOMIC);
1538
1539 if (status) {
1540 mos7840_port->busy[i] = 0;
1541 dev_err(&port->dev, "%s - usb_submit_urb(write bulk) failed "
1542 "with status = %d\n", __func__, status);
1543 bytes_sent = status;
1544 goto exit;
1545 }
1546 bytes_sent = transfer_size;
1547 mos7840_port->icount.tx += transfer_size;
1548 smp_wmb();
1549 dbg("mos7840_port->icount.tx is %d:\n", mos7840_port->icount.tx);
1550 exit:
1551 return bytes_sent;
1552
1553 }
1554
1555 /*****************************************************************************
1556 * mos7840_throttle
1557 * this function is called by the tty driver when it wants to stop the data
1558 * being read from the port.
1559 *****************************************************************************/
1560
1561 static void mos7840_throttle(struct tty_struct *tty)
1562 {
1563 struct usb_serial_port *port = tty->driver_data;
1564 struct moschip_port *mos7840_port;
1565 int status;
1566
1567 if (mos7840_port_paranoia_check(port, __func__)) {
1568 dbg("%s", "Invalid port \n");
1569 return;
1570 }
1571
1572 dbg("- port %d\n", port->number);
1573
1574 mos7840_port = mos7840_get_port_private(port);
1575
1576 if (mos7840_port == NULL)
1577 return;
1578
1579 if (!mos7840_port->open) {
1580 dbg("%s\n", "port not opened");
1581 return;
1582 }
1583
1584 dbg("%s", "Entering .......... \n");
1585
1586 /* if we are implementing XON/XOFF, send the stop character */
1587 if (I_IXOFF(tty)) {
1588 unsigned char stop_char = STOP_CHAR(tty);
1589 status = mos7840_write(tty, port, &stop_char, 1);
1590 if (status <= 0)
1591 return;
1592 }
1593 /* if we are implementing RTS/CTS, toggle that line */
1594 if (tty->termios->c_cflag & CRTSCTS) {
1595 mos7840_port->shadowMCR &= ~MCR_RTS;
1596 status = mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER,
1597 mos7840_port->shadowMCR);
1598 if (status < 0)
1599 return;
1600 }
1601
1602 return;
1603 }
1604
1605 /*****************************************************************************
1606 * mos7840_unthrottle
1607 * this function is called by the tty driver when it wants to resume
1608 * the data being read from the port (called after mos7840_throttle is
1609 * called)
1610 *****************************************************************************/
1611 static void mos7840_unthrottle(struct tty_struct *tty)
1612 {
1613 struct usb_serial_port *port = tty->driver_data;
1614 int status;
1615 struct moschip_port *mos7840_port = mos7840_get_port_private(port);
1616
1617 if (mos7840_port_paranoia_check(port, __func__)) {
1618 dbg("%s", "Invalid port \n");
1619 return;
1620 }
1621
1622 if (mos7840_port == NULL)
1623 return;
1624
1625 if (!mos7840_port->open) {
1626 dbg("%s - port not opened", __func__);
1627 return;
1628 }
1629
1630 dbg("%s", "Entering .......... \n");
1631
1632 /* if we are implementing XON/XOFF, send the start character */
1633 if (I_IXOFF(tty)) {
1634 unsigned char start_char = START_CHAR(tty);
1635 status = mos7840_write(tty, port, &start_char, 1);
1636 if (status <= 0)
1637 return;
1638 }
1639
1640 /* if we are implementing RTS/CTS, toggle that line */
1641 if (tty->termios->c_cflag & CRTSCTS) {
1642 mos7840_port->shadowMCR |= MCR_RTS;
1643 status = mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER,
1644 mos7840_port->shadowMCR);
1645 if (status < 0)
1646 return;
1647 }
1648 }
1649
1650 static int mos7840_tiocmget(struct tty_struct *tty, struct file *file)
1651 {
1652 struct usb_serial_port *port = tty->driver_data;
1653 struct moschip_port *mos7840_port;
1654 unsigned int result;
1655 __u16 msr;
1656 __u16 mcr;
1657 int status;
1658 mos7840_port = mos7840_get_port_private(port);
1659
1660 dbg("%s - port %d", __func__, port->number);
1661
1662 if (mos7840_port == NULL)
1663 return -ENODEV;
1664
1665 status = mos7840_get_uart_reg(port, MODEM_STATUS_REGISTER, &msr);
1666 status = mos7840_get_uart_reg(port, MODEM_CONTROL_REGISTER, &mcr);
1667 result = ((mcr & MCR_DTR) ? TIOCM_DTR : 0)
1668 | ((mcr & MCR_RTS) ? TIOCM_RTS : 0)
1669 | ((mcr & MCR_LOOPBACK) ? TIOCM_LOOP : 0)
1670 | ((msr & MOS7840_MSR_CTS) ? TIOCM_CTS : 0)
1671 | ((msr & MOS7840_MSR_CD) ? TIOCM_CAR : 0)
1672 | ((msr & MOS7840_MSR_RI) ? TIOCM_RI : 0)
1673 | ((msr & MOS7840_MSR_DSR) ? TIOCM_DSR : 0);
1674
1675 dbg("%s - 0x%04X", __func__, result);
1676
1677 return result;
1678 }
1679
1680 static int mos7840_tiocmset(struct tty_struct *tty, struct file *file,
1681 unsigned int set, unsigned int clear)
1682 {
1683 struct usb_serial_port *port = tty->driver_data;
1684 struct moschip_port *mos7840_port;
1685 unsigned int mcr;
1686 int status;
1687
1688 dbg("%s - port %d", __func__, port->number);
1689
1690 mos7840_port = mos7840_get_port_private(port);
1691
1692 if (mos7840_port == NULL)
1693 return -ENODEV;
1694
1695 /* FIXME: What locks the port registers ? */
1696 mcr = mos7840_port->shadowMCR;
1697 if (clear & TIOCM_RTS)
1698 mcr &= ~MCR_RTS;
1699 if (clear & TIOCM_DTR)
1700 mcr &= ~MCR_DTR;
1701 if (clear & TIOCM_LOOP)
1702 mcr &= ~MCR_LOOPBACK;
1703
1704 if (set & TIOCM_RTS)
1705 mcr |= MCR_RTS;
1706 if (set & TIOCM_DTR)
1707 mcr |= MCR_DTR;
1708 if (set & TIOCM_LOOP)
1709 mcr |= MCR_LOOPBACK;
1710
1711 mos7840_port->shadowMCR = mcr;
1712
1713 status = mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER, mcr);
1714 if (status < 0) {
1715 dbg("setting MODEM_CONTROL_REGISTER Failed\n");
1716 return status;
1717 }
1718
1719 return 0;
1720 }
1721
1722 /*****************************************************************************
1723 * mos7840_calc_baud_rate_divisor
1724 * this function calculates the proper baud rate divisor for the specified
1725 * baud rate.
1726 *****************************************************************************/
1727 static int mos7840_calc_baud_rate_divisor(int baudRate, int *divisor,
1728 __u16 *clk_sel_val)
1729 {
1730
1731 dbg("%s - %d", __func__, baudRate);
1732
1733 if (baudRate <= 115200) {
1734 *divisor = 115200 / baudRate;
1735 *clk_sel_val = 0x0;
1736 }
1737 if ((baudRate > 115200) && (baudRate <= 230400)) {
1738 *divisor = 230400 / baudRate;
1739 *clk_sel_val = 0x10;
1740 } else if ((baudRate > 230400) && (baudRate <= 403200)) {
1741 *divisor = 403200 / baudRate;
1742 *clk_sel_val = 0x20;
1743 } else if ((baudRate > 403200) && (baudRate <= 460800)) {
1744 *divisor = 460800 / baudRate;
1745 *clk_sel_val = 0x30;
1746 } else if ((baudRate > 460800) && (baudRate <= 806400)) {
1747 *divisor = 806400 / baudRate;
1748 *clk_sel_val = 0x40;
1749 } else if ((baudRate > 806400) && (baudRate <= 921600)) {
1750 *divisor = 921600 / baudRate;
1751 *clk_sel_val = 0x50;
1752 } else if ((baudRate > 921600) && (baudRate <= 1572864)) {
1753 *divisor = 1572864 / baudRate;
1754 *clk_sel_val = 0x60;
1755 } else if ((baudRate > 1572864) && (baudRate <= 3145728)) {
1756 *divisor = 3145728 / baudRate;
1757 *clk_sel_val = 0x70;
1758 }
1759 return 0;
1760
1761 #ifdef NOTMCS7840
1762
1763 for (i = 0; i < ARRAY_SIZE(mos7840_divisor_table); i++) {
1764 if (mos7840_divisor_table[i].BaudRate == baudrate) {
1765 *divisor = mos7840_divisor_table[i].Divisor;
1766 return 0;
1767 }
1768 }
1769
1770 /* After trying for all the standard baud rates *
1771 * Try calculating the divisor for this baud rate */
1772
1773 if (baudrate > 75 && baudrate < 230400) {
1774 /* get the divisor */
1775 custom = (__u16) (230400L / baudrate);
1776
1777 /* Check for round off */
1778 round1 = (__u16) (2304000L / baudrate);
1779 round = (__u16) (round1 - (custom * 10));
1780 if (round > 4)
1781 custom++;
1782 *divisor = custom;
1783
1784 dbg(" Baud %d = %d\n", baudrate, custom);
1785 return 0;
1786 }
1787
1788 dbg("%s\n", " Baud calculation Failed...");
1789 return -1;
1790 #endif
1791 }
1792
1793 /*****************************************************************************
1794 * mos7840_send_cmd_write_baud_rate
1795 * this function sends the proper command to change the baud rate of the
1796 * specified port.
1797 *****************************************************************************/
1798
1799 static int mos7840_send_cmd_write_baud_rate(struct moschip_port *mos7840_port,
1800 int baudRate)
1801 {
1802 int divisor = 0;
1803 int status;
1804 __u16 Data;
1805 unsigned char number;
1806 __u16 clk_sel_val;
1807 struct usb_serial_port *port;
1808
1809 if (mos7840_port == NULL)
1810 return -1;
1811
1812 port = (struct usb_serial_port *)mos7840_port->port;
1813 if (mos7840_port_paranoia_check(port, __func__)) {
1814 dbg("%s", "Invalid port \n");
1815 return -1;
1816 }
1817
1818 if (mos7840_serial_paranoia_check(port->serial, __func__)) {
1819 dbg("%s", "Invalid Serial \n");
1820 return -1;
1821 }
1822
1823 dbg("%s", "Entering .......... \n");
1824
1825 number = mos7840_port->port->number - mos7840_port->port->serial->minor;
1826
1827 dbg("%s - port = %d, baud = %d", __func__,
1828 mos7840_port->port->number, baudRate);
1829 /* reset clk_uart_sel in spregOffset */
1830 if (baudRate > 115200) {
1831 #ifdef HW_flow_control
1832 /* NOTE: need to see the pther register to modify */
1833 /* setting h/w flow control bit to 1 */
1834 Data = 0x2b;
1835 mos7840_port->shadowMCR = Data;
1836 status = mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER,
1837 Data);
1838 if (status < 0) {
1839 dbg("Writing spreg failed in set_serial_baud\n");
1840 return -1;
1841 }
1842 #endif
1843
1844 } else {
1845 #ifdef HW_flow_control
1846 / *setting h/w flow control bit to 0 */
1847 Data = 0xb;
1848 mos7840_port->shadowMCR = Data;
1849 status = mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER,
1850 Data);
1851 if (status < 0) {
1852 dbg("Writing spreg failed in set_serial_baud\n");
1853 return -1;
1854 }
1855 #endif
1856
1857 }
1858
1859 if (1) { /* baudRate <= 115200) */
1860 clk_sel_val = 0x0;
1861 Data = 0x0;
1862 status = mos7840_calc_baud_rate_divisor(baudRate, &divisor,
1863 &clk_sel_val);
1864 status = mos7840_get_reg_sync(port, mos7840_port->SpRegOffset,
1865 &Data);
1866 if (status < 0) {
1867 dbg("reading spreg failed in set_serial_baud\n");
1868 return -1;
1869 }
1870 Data = (Data & 0x8f) | clk_sel_val;
1871 status = mos7840_set_reg_sync(port, mos7840_port->SpRegOffset,
1872 Data);
1873 if (status < 0) {
1874 dbg("Writing spreg failed in set_serial_baud\n");
1875 return -1;
1876 }
1877 /* Calculate the Divisor */
1878
1879 if (status) {
1880 dev_err(&port->dev, "%s - bad baud rate\n", __func__);
1881 return status;
1882 }
1883 /* Enable access to divisor latch */
1884 Data = mos7840_port->shadowLCR | SERIAL_LCR_DLAB;
1885 mos7840_port->shadowLCR = Data;
1886 mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data);
1887
1888 /* Write the divisor */
1889 Data = (unsigned char)(divisor & 0xff);
1890 dbg("set_serial_baud Value to write DLL is %x\n", Data);
1891 mos7840_set_uart_reg(port, DIVISOR_LATCH_LSB, Data);
1892
1893 Data = (unsigned char)((divisor & 0xff00) >> 8);
1894 dbg("set_serial_baud Value to write DLM is %x\n", Data);
1895 mos7840_set_uart_reg(port, DIVISOR_LATCH_MSB, Data);
1896
1897 /* Disable access to divisor latch */
1898 Data = mos7840_port->shadowLCR & ~SERIAL_LCR_DLAB;
1899 mos7840_port->shadowLCR = Data;
1900 mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data);
1901
1902 }
1903 return status;
1904 }
1905
1906 /*****************************************************************************
1907 * mos7840_change_port_settings
1908 * This routine is called to set the UART on the device to match
1909 * the specified new settings.
1910 *****************************************************************************/
1911
1912 static void mos7840_change_port_settings(struct tty_struct *tty,
1913 struct moschip_port *mos7840_port, struct ktermios *old_termios)
1914 {
1915 int baud;
1916 unsigned cflag;
1917 unsigned iflag;
1918 __u8 lData;
1919 __u8 lParity;
1920 __u8 lStop;
1921 int status;
1922 __u16 Data;
1923 struct usb_serial_port *port;
1924 struct usb_serial *serial;
1925
1926 if (mos7840_port == NULL)
1927 return;
1928
1929 port = (struct usb_serial_port *)mos7840_port->port;
1930
1931 if (mos7840_port_paranoia_check(port, __func__)) {
1932 dbg("%s", "Invalid port \n");
1933 return;
1934 }
1935
1936 if (mos7840_serial_paranoia_check(port->serial, __func__)) {
1937 dbg("%s", "Invalid Serial \n");
1938 return;
1939 }
1940
1941 serial = port->serial;
1942
1943 dbg("%s - port %d", __func__, mos7840_port->port->number);
1944
1945 if (!mos7840_port->open) {
1946 dbg("%s - port not opened", __func__);
1947 return;
1948 }
1949
1950 dbg("%s", "Entering .......... \n");
1951
1952 lData = LCR_BITS_8;
1953 lStop = LCR_STOP_1;
1954 lParity = LCR_PAR_NONE;
1955
1956 cflag = tty->termios->c_cflag;
1957 iflag = tty->termios->c_iflag;
1958
1959 /* Change the number of bits */
1960 if (cflag & CSIZE) {
1961 switch (cflag & CSIZE) {
1962 case CS5:
1963 lData = LCR_BITS_5;
1964 break;
1965
1966 case CS6:
1967 lData = LCR_BITS_6;
1968 break;
1969
1970 case CS7:
1971 lData = LCR_BITS_7;
1972 break;
1973 default:
1974 case CS8:
1975 lData = LCR_BITS_8;
1976 break;
1977 }
1978 }
1979 /* Change the Parity bit */
1980 if (cflag & PARENB) {
1981 if (cflag & PARODD) {
1982 lParity = LCR_PAR_ODD;
1983 dbg("%s - parity = odd", __func__);
1984 } else {
1985 lParity = LCR_PAR_EVEN;
1986 dbg("%s - parity = even", __func__);
1987 }
1988
1989 } else {
1990 dbg("%s - parity = none", __func__);
1991 }
1992
1993 if (cflag & CMSPAR)
1994 lParity = lParity | 0x20;
1995
1996 /* Change the Stop bit */
1997 if (cflag & CSTOPB) {
1998 lStop = LCR_STOP_2;
1999 dbg("%s - stop bits = 2", __func__);
2000 } else {
2001 lStop = LCR_STOP_1;
2002 dbg("%s - stop bits = 1", __func__);
2003 }
2004
2005 /* Update the LCR with the correct value */
2006 mos7840_port->shadowLCR &=
2007 ~(LCR_BITS_MASK | LCR_STOP_MASK | LCR_PAR_MASK);
2008 mos7840_port->shadowLCR |= (lData | lParity | lStop);
2009
2010 dbg("mos7840_change_port_settings mos7840_port->shadowLCR is %x\n",
2011 mos7840_port->shadowLCR);
2012 /* Disable Interrupts */
2013 Data = 0x00;
2014 mos7840_set_uart_reg(port, INTERRUPT_ENABLE_REGISTER, Data);
2015
2016 Data = 0x00;
2017 mos7840_set_uart_reg(port, FIFO_CONTROL_REGISTER, Data);
2018
2019 Data = 0xcf;
2020 mos7840_set_uart_reg(port, FIFO_CONTROL_REGISTER, Data);
2021
2022 /* Send the updated LCR value to the mos7840 */
2023 Data = mos7840_port->shadowLCR;
2024
2025 mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data);
2026
2027 Data = 0x00b;
2028 mos7840_port->shadowMCR = Data;
2029 mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER, Data);
2030 Data = 0x00b;
2031 mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER, Data);
2032
2033 /* set up the MCR register and send it to the mos7840 */
2034
2035 mos7840_port->shadowMCR = MCR_MASTER_IE;
2036 if (cflag & CBAUD)
2037 mos7840_port->shadowMCR |= (MCR_DTR | MCR_RTS);
2038
2039 if (cflag & CRTSCTS)
2040 mos7840_port->shadowMCR |= (MCR_XON_ANY);
2041 else
2042 mos7840_port->shadowMCR &= ~(MCR_XON_ANY);
2043
2044 Data = mos7840_port->shadowMCR;
2045 mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER, Data);
2046
2047 /* Determine divisor based on baud rate */
2048 baud = tty_get_baud_rate(tty);
2049
2050 if (!baud) {
2051 /* pick a default, any default... */
2052 dbg("%s\n", "Picked default baud...");
2053 baud = 9600;
2054 }
2055
2056 dbg("%s - baud rate = %d", __func__, baud);
2057 status = mos7840_send_cmd_write_baud_rate(mos7840_port, baud);
2058
2059 /* Enable Interrupts */
2060 Data = 0x0c;
2061 mos7840_set_uart_reg(port, INTERRUPT_ENABLE_REGISTER, Data);
2062
2063 if (mos7840_port->read_urb_busy == false) {
2064 mos7840_port->read_urb->dev = serial->dev;
2065 mos7840_port->read_urb_busy = true;
2066 status = usb_submit_urb(mos7840_port->read_urb, GFP_ATOMIC);
2067 if (status) {
2068 dbg("usb_submit_urb(read bulk) failed, status = %d",
2069 status);
2070 mos7840_port->read_urb_busy = false;
2071 }
2072 }
2073 wake_up(&mos7840_port->delta_msr_wait);
2074 mos7840_port->delta_msr_cond = 1;
2075 dbg("mos7840_change_port_settings mos7840_port->shadowLCR is End %x\n",
2076 mos7840_port->shadowLCR);
2077
2078 return;
2079 }
2080
2081 /*****************************************************************************
2082 * mos7840_set_termios
2083 * this function is called by the tty driver when it wants to change
2084 * the termios structure
2085 *****************************************************************************/
2086
2087 static void mos7840_set_termios(struct tty_struct *tty,
2088 struct usb_serial_port *port,
2089 struct ktermios *old_termios)
2090 {
2091 int status;
2092 unsigned int cflag;
2093 struct usb_serial *serial;
2094 struct moschip_port *mos7840_port;
2095 dbg("mos7840_set_termios: START\n");
2096 if (mos7840_port_paranoia_check(port, __func__)) {
2097 dbg("%s", "Invalid port \n");
2098 return;
2099 }
2100
2101 serial = port->serial;
2102
2103 if (mos7840_serial_paranoia_check(serial, __func__)) {
2104 dbg("%s", "Invalid Serial \n");
2105 return;
2106 }
2107
2108 mos7840_port = mos7840_get_port_private(port);
2109
2110 if (mos7840_port == NULL)
2111 return;
2112
2113 if (!mos7840_port->open) {
2114 dbg("%s - port not opened", __func__);
2115 return;
2116 }
2117
2118 dbg("%s\n", "setting termios - ");
2119
2120 cflag = tty->termios->c_cflag;
2121
2122 dbg("%s - clfag %08x iflag %08x", __func__,
2123 tty->termios->c_cflag, RELEVANT_IFLAG(tty->termios->c_iflag));
2124 dbg("%s - old clfag %08x old iflag %08x", __func__,
2125 old_termios->c_cflag, RELEVANT_IFLAG(old_termios->c_iflag));
2126 dbg("%s - port %d", __func__, port->number);
2127
2128 /* change the port settings to the new ones specified */
2129
2130 mos7840_change_port_settings(tty, mos7840_port, old_termios);
2131
2132 if (!mos7840_port->read_urb) {
2133 dbg("%s", "URB KILLED !!!!!\n");
2134 return;
2135 }
2136
2137 if (mos7840_port->read_urb_busy == false) {
2138 mos7840_port->read_urb->dev = serial->dev;
2139 mos7840_port->read_urb_busy = true;
2140 status = usb_submit_urb(mos7840_port->read_urb, GFP_ATOMIC);
2141 if (status) {
2142 dbg("usb_submit_urb(read bulk) failed, status = %d",
2143 status);
2144 mos7840_port->read_urb_busy = false;
2145 }
2146 }
2147 return;
2148 }
2149
2150 /*****************************************************************************
2151 * mos7840_get_lsr_info - get line status register info
2152 *
2153 * Purpose: Let user call ioctl() to get info when the UART physically
2154 * is emptied. On bus types like RS485, the transmitter must
2155 * release the bus after transmitting. This must be done when
2156 * the transmit shift register is empty, not be done when the
2157 * transmit holding register is empty. This functionality
2158 * allows an RS485 driver to be written in user space.
2159 *****************************************************************************/
2160
2161 static int mos7840_get_lsr_info(struct tty_struct *tty,
2162 unsigned int __user *value)
2163 {
2164 int count;
2165 unsigned int result = 0;
2166
2167 count = mos7840_chars_in_buffer(tty);
2168 if (count == 0) {
2169 dbg("%s -- Empty", __func__);
2170 result = TIOCSER_TEMT;
2171 }
2172
2173 if (copy_to_user(value, &result, sizeof(int)))
2174 return -EFAULT;
2175 return 0;
2176 }
2177
2178 /*****************************************************************************
2179 * mos7840_set_modem_info
2180 * function to set modem info
2181 *****************************************************************************/
2182
2183 /* FIXME: Should be using the model control hooks */
2184
2185 static int mos7840_set_modem_info(struct moschip_port *mos7840_port,
2186 unsigned int cmd, unsigned int __user *value)
2187 {
2188 unsigned int mcr;
2189 unsigned int arg;
2190 __u16 Data;
2191 int status;
2192 struct usb_serial_port *port;
2193
2194 if (mos7840_port == NULL)
2195 return -1;
2196
2197 port = (struct usb_serial_port *)mos7840_port->port;
2198 if (mos7840_port_paranoia_check(port, __func__)) {
2199 dbg("%s", "Invalid port \n");
2200 return -1;
2201 }
2202
2203 mcr = mos7840_port->shadowMCR;
2204
2205 if (copy_from_user(&arg, value, sizeof(int)))
2206 return -EFAULT;
2207
2208 switch (cmd) {
2209 case TIOCMBIS:
2210 if (arg & TIOCM_RTS)
2211 mcr |= MCR_RTS;
2212 if (arg & TIOCM_DTR)
2213 mcr |= MCR_RTS;
2214 if (arg & TIOCM_LOOP)
2215 mcr |= MCR_LOOPBACK;
2216 break;
2217
2218 case TIOCMBIC:
2219 if (arg & TIOCM_RTS)
2220 mcr &= ~MCR_RTS;
2221 if (arg & TIOCM_DTR)
2222 mcr &= ~MCR_RTS;
2223 if (arg & TIOCM_LOOP)
2224 mcr &= ~MCR_LOOPBACK;
2225 break;
2226
2227 case TIOCMSET:
2228 /* turn off the RTS and DTR and LOOPBACK
2229 * and then only turn on what was asked to */
2230 mcr &= ~(MCR_RTS | MCR_DTR | MCR_LOOPBACK);
2231 mcr |= ((arg & TIOCM_RTS) ? MCR_RTS : 0);
2232 mcr |= ((arg & TIOCM_DTR) ? MCR_DTR : 0);
2233 mcr |= ((arg & TIOCM_LOOP) ? MCR_LOOPBACK : 0);
2234 break;
2235 }
2236
2237 lock_kernel();
2238 mos7840_port->shadowMCR = mcr;
2239
2240 Data = mos7840_port->shadowMCR;
2241 status = mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER, Data);
2242 unlock_kernel();
2243 if (status < 0) {
2244 dbg("setting MODEM_CONTROL_REGISTER Failed\n");
2245 return -1;
2246 }
2247
2248 return 0;
2249 }
2250
2251 /*****************************************************************************
2252 * mos7840_get_modem_info
2253 * function to get modem info
2254 *****************************************************************************/
2255
2256 static int mos7840_get_modem_info(struct moschip_port *mos7840_port,
2257 unsigned int __user *value)
2258 {
2259 unsigned int result = 0;
2260 __u16 msr;
2261 unsigned int mcr = mos7840_port->shadowMCR;
2262 mos7840_get_uart_reg(mos7840_port->port,
2263 MODEM_STATUS_REGISTER, &msr);
2264 result = ((mcr & MCR_DTR) ? TIOCM_DTR : 0) /* 0x002 */
2265 |((mcr & MCR_RTS) ? TIOCM_RTS : 0) /* 0x004 */
2266 |((msr & MOS7840_MSR_CTS) ? TIOCM_CTS : 0) /* 0x020 */
2267 |((msr & MOS7840_MSR_CD) ? TIOCM_CAR : 0) /* 0x040 */
2268 |((msr & MOS7840_MSR_RI) ? TIOCM_RI : 0) /* 0x080 */
2269 |((msr & MOS7840_MSR_DSR) ? TIOCM_DSR : 0); /* 0x100 */
2270
2271 dbg("%s -- %x", __func__, result);
2272
2273 if (copy_to_user(value, &result, sizeof(int)))
2274 return -EFAULT;
2275 return 0;
2276 }
2277
2278 /*****************************************************************************
2279 * mos7840_get_serial_info
2280 * function to get information about serial port
2281 *****************************************************************************/
2282
2283 static int mos7840_get_serial_info(struct moschip_port *mos7840_port,
2284 struct serial_struct __user *retinfo)
2285 {
2286 struct serial_struct tmp;
2287
2288 if (mos7840_port == NULL)
2289 return -1;
2290
2291 if (!retinfo)
2292 return -EFAULT;
2293
2294 memset(&tmp, 0, sizeof(tmp));
2295
2296 tmp.type = PORT_16550A;
2297 tmp.line = mos7840_port->port->serial->minor;
2298 tmp.port = mos7840_port->port->number;
2299 tmp.irq = 0;
2300 tmp.flags = ASYNC_SKIP_TEST | ASYNC_AUTO_IRQ;
2301 tmp.xmit_fifo_size = NUM_URBS * URB_TRANSFER_BUFFER_SIZE;
2302 tmp.baud_base = 9600;
2303 tmp.close_delay = 5 * HZ;
2304 tmp.closing_wait = 30 * HZ;
2305
2306 if (copy_to_user(retinfo, &tmp, sizeof(*retinfo)))
2307 return -EFAULT;
2308 return 0;
2309 }
2310
2311 /*****************************************************************************
2312 * SerialIoctl
2313 * this function handles any ioctl calls to the driver
2314 *****************************************************************************/
2315
2316 static int mos7840_ioctl(struct tty_struct *tty, struct file *file,
2317 unsigned int cmd, unsigned long arg)
2318 {
2319 struct usb_serial_port *port = tty->driver_data;
2320 void __user *argp = (void __user *)arg;
2321 struct moschip_port *mos7840_port;
2322
2323 struct async_icount cnow;
2324 struct async_icount cprev;
2325 struct serial_icounter_struct icount;
2326 int mosret = 0;
2327
2328 if (mos7840_port_paranoia_check(port, __func__)) {
2329 dbg("%s", "Invalid port \n");
2330 return -1;
2331 }
2332
2333 mos7840_port = mos7840_get_port_private(port);
2334
2335 if (mos7840_port == NULL)
2336 return -1;
2337
2338 dbg("%s - port %d, cmd = 0x%x", __func__, port->number, cmd);
2339
2340 switch (cmd) {
2341 /* return number of bytes available */
2342
2343 case TIOCSERGETLSR:
2344 dbg("%s (%d) TIOCSERGETLSR", __func__, port->number);
2345 return mos7840_get_lsr_info(tty, argp);
2346 return 0;
2347
2348 /* FIXME: use the modem hooks and remove this */
2349 case TIOCMBIS:
2350 case TIOCMBIC:
2351 case TIOCMSET:
2352 dbg("%s (%d) TIOCMSET/TIOCMBIC/TIOCMSET", __func__,
2353 port->number);
2354 mosret =
2355 mos7840_set_modem_info(mos7840_port, cmd, argp);
2356 return mosret;
2357
2358 case TIOCMGET:
2359 dbg("%s (%d) TIOCMGET", __func__, port->number);
2360 return mos7840_get_modem_info(mos7840_port, argp);
2361
2362 case TIOCGSERIAL:
2363 dbg("%s (%d) TIOCGSERIAL", __func__, port->number);
2364 return mos7840_get_serial_info(mos7840_port, argp);
2365
2366 case TIOCSSERIAL:
2367 dbg("%s (%d) TIOCSSERIAL", __func__, port->number);
2368 break;
2369
2370 case TIOCMIWAIT:
2371 dbg("%s (%d) TIOCMIWAIT", __func__, port->number);
2372 cprev = mos7840_port->icount;
2373 while (1) {
2374 /* interruptible_sleep_on(&mos7840_port->delta_msr_wait); */
2375 mos7840_port->delta_msr_cond = 0;
2376 wait_event_interruptible(mos7840_port->delta_msr_wait,
2377 (mos7840_port->
2378 delta_msr_cond == 1));
2379
2380 /* see if a signal did it */
2381 if (signal_pending(current))
2382 return -ERESTARTSYS;
2383 cnow = mos7840_port->icount;
2384 smp_rmb();
2385 if (cnow.rng == cprev.rng && cnow.dsr == cprev.dsr &&
2386 cnow.dcd == cprev.dcd && cnow.cts == cprev.cts)
2387 return -EIO; /* no change => error */
2388 if (((arg & TIOCM_RNG) && (cnow.rng != cprev.rng)) ||
2389 ((arg & TIOCM_DSR) && (cnow.dsr != cprev.dsr)) ||
2390 ((arg & TIOCM_CD) && (cnow.dcd != cprev.dcd)) ||
2391 ((arg & TIOCM_CTS) && (cnow.cts != cprev.cts))) {
2392 return 0;
2393 }
2394 cprev = cnow;
2395 }
2396 /* NOTREACHED */
2397 break;
2398
2399 case TIOCGICOUNT:
2400 cnow = mos7840_port->icount;
2401 smp_rmb();
2402 icount.cts = cnow.cts;
2403 icount.dsr = cnow.dsr;
2404 icount.rng = cnow.rng;
2405 icount.dcd = cnow.dcd;
2406 icount.rx = cnow.rx;
2407 icount.tx = cnow.tx;
2408 icount.frame = cnow.frame;
2409 icount.overrun = cnow.overrun;
2410 icount.parity = cnow.parity;
2411 icount.brk = cnow.brk;
2412 icount.buf_overrun = cnow.buf_overrun;
2413
2414 dbg("%s (%d) TIOCGICOUNT RX=%d, TX=%d", __func__,
2415 port->number, icount.rx, icount.tx);
2416 if (copy_to_user(argp, &icount, sizeof(icount)))
2417 return -EFAULT;
2418 return 0;
2419 default:
2420 break;
2421 }
2422 return -ENOIOCTLCMD;
2423 }
2424
2425 static int mos7840_calc_num_ports(struct usb_serial *serial)
2426 {
2427 int mos7840_num_ports = 0;
2428
2429 dbg("numberofendpoints: %d \n",
2430 (int)serial->interface->cur_altsetting->desc.bNumEndpoints);
2431 dbg("numberofendpoints: %d \n",
2432 (int)serial->interface->altsetting->desc.bNumEndpoints);
2433 if (serial->interface->cur_altsetting->desc.bNumEndpoints == 5) {
2434 mos7840_num_ports = serial->num_ports = 2;
2435 } else if (serial->interface->cur_altsetting->desc.bNumEndpoints == 9) {
2436 serial->num_bulk_in = 4;
2437 serial->num_bulk_out = 4;
2438 mos7840_num_ports = serial->num_ports = 4;
2439 }
2440
2441 return mos7840_num_ports;
2442 }
2443
2444 /****************************************************************************
2445 * mos7840_startup
2446 ****************************************************************************/
2447
2448 static int mos7840_startup(struct usb_serial *serial)
2449 {
2450 struct moschip_port *mos7840_port;
2451 struct usb_device *dev;
2452 int i, status;
2453
2454 __u16 Data;
2455 dbg("%s \n", " mos7840_startup :entering..........");
2456
2457 if (!serial) {
2458 dbg("%s\n", "Invalid Handler");
2459 return -1;
2460 }
2461
2462 dev = serial->dev;
2463
2464 dbg("%s\n", "Entering...");
2465
2466 /* we set up the pointers to the endpoints in the mos7840_open *
2467 * function, as the structures aren't created yet. */
2468
2469 /* set up port private structures */
2470 for (i = 0; i < serial->num_ports; ++i) {
2471 mos7840_port = kzalloc(sizeof(struct moschip_port), GFP_KERNEL);
2472 if (mos7840_port == NULL) {
2473 dev_err(&dev->dev, "%s - Out of memory\n", __func__);
2474 status = -ENOMEM;
2475 i--; /* don't follow NULL pointer cleaning up */
2476 goto error;
2477 }
2478
2479 /* Initialize all port interrupt end point to port 0 int
2480 * endpoint. Our device has only one interrupt end point
2481 * common to all port */
2482
2483 mos7840_port->port = serial->port[i];
2484 mos7840_set_port_private(serial->port[i], mos7840_port);
2485 spin_lock_init(&mos7840_port->pool_lock);
2486
2487 /* minor is not initialised until later by
2488 * usb-serial.c:get_free_serial() and cannot therefore be used
2489 * to index device instances */
2490 mos7840_port->port_num = i + 1;
2491 dbg ("serial->port[i]->number = %d", serial->port[i]->number);
2492 dbg ("serial->port[i]->serial->minor = %d", serial->port[i]->serial->minor);
2493 dbg ("mos7840_port->port_num = %d", mos7840_port->port_num);
2494 dbg ("serial->minor = %d", serial->minor);
2495
2496 if (mos7840_port->port_num == 1) {
2497 mos7840_port->SpRegOffset = 0x0;
2498 mos7840_port->ControlRegOffset = 0x1;
2499 mos7840_port->DcrRegOffset = 0x4;
2500 } else if ((mos7840_port->port_num == 2)
2501 && (serial->num_ports == 4)) {
2502 mos7840_port->SpRegOffset = 0x8;
2503 mos7840_port->ControlRegOffset = 0x9;
2504 mos7840_port->DcrRegOffset = 0x16;
2505 } else if ((mos7840_port->port_num == 2)
2506 && (serial->num_ports == 2)) {
2507 mos7840_port->SpRegOffset = 0xa;
2508 mos7840_port->ControlRegOffset = 0xb;
2509 mos7840_port->DcrRegOffset = 0x19;
2510 } else if ((mos7840_port->port_num == 3)
2511 && (serial->num_ports == 4)) {
2512 mos7840_port->SpRegOffset = 0xa;
2513 mos7840_port->ControlRegOffset = 0xb;
2514 mos7840_port->DcrRegOffset = 0x19;
2515 } else if ((mos7840_port->port_num == 4)
2516 && (serial->num_ports == 4)) {
2517 mos7840_port->SpRegOffset = 0xc;
2518 mos7840_port->ControlRegOffset = 0xd;
2519 mos7840_port->DcrRegOffset = 0x1c;
2520 }
2521 mos7840_dump_serial_port(mos7840_port);
2522 mos7840_set_port_private(serial->port[i], mos7840_port);
2523
2524 /* enable rx_disable bit in control register */
2525 status = mos7840_get_reg_sync(serial->port[i],
2526 mos7840_port->ControlRegOffset, &Data);
2527 if (status < 0) {
2528 dbg("Reading ControlReg failed status-0x%x\n", status);
2529 break;
2530 } else
2531 dbg("ControlReg Reading success val is %x, status%d\n",
2532 Data, status);
2533 Data |= 0x08; /* setting driver done bit */
2534 Data |= 0x04; /* sp1_bit to have cts change reflect in
2535 modem status reg */
2536
2537 /* Data |= 0x20; //rx_disable bit */
2538 status = mos7840_set_reg_sync(serial->port[i],
2539 mos7840_port->ControlRegOffset, Data);
2540 if (status < 0) {
2541 dbg("Writing ControlReg failed(rx_disable) status-0x%x\n", status);
2542 break;
2543 } else
2544 dbg("ControlReg Writing success(rx_disable) status%d\n",
2545 status);
2546
2547 /* Write default values in DCR (i.e 0x01 in DCR0, 0x05 in DCR2
2548 and 0x24 in DCR3 */
2549 Data = 0x01;
2550 status = mos7840_set_reg_sync(serial->port[i],
2551 (__u16) (mos7840_port->DcrRegOffset + 0), Data);
2552 if (status < 0) {
2553 dbg("Writing DCR0 failed status-0x%x\n", status);
2554 break;
2555 } else
2556 dbg("DCR0 Writing success status%d\n", status);
2557
2558 Data = 0x05;
2559 status = mos7840_set_reg_sync(serial->port[i],
2560 (__u16) (mos7840_port->DcrRegOffset + 1), Data);
2561 if (status < 0) {
2562 dbg("Writing DCR1 failed status-0x%x\n", status);
2563 break;
2564 } else
2565 dbg("DCR1 Writing success status%d\n", status);
2566
2567 Data = 0x24;
2568 status = mos7840_set_reg_sync(serial->port[i],
2569 (__u16) (mos7840_port->DcrRegOffset + 2), Data);
2570 if (status < 0) {
2571 dbg("Writing DCR2 failed status-0x%x\n", status);
2572 break;
2573 } else
2574 dbg("DCR2 Writing success status%d\n", status);
2575
2576 /* write values in clkstart0x0 and clkmulti 0x20 */
2577 Data = 0x0;
2578 status = mos7840_set_reg_sync(serial->port[i],
2579 CLK_START_VALUE_REGISTER, Data);
2580 if (status < 0) {
2581 dbg("Writing CLK_START_VALUE_REGISTER failed status-0x%x\n", status);
2582 break;
2583 } else
2584 dbg("CLK_START_VALUE_REGISTER Writing success status%d\n", status);
2585
2586 Data = 0x20;
2587 status = mos7840_set_reg_sync(serial->port[i],
2588 CLK_MULTI_REGISTER, Data);
2589 if (status < 0) {
2590 dbg("Writing CLK_MULTI_REGISTER failed status-0x%x\n",
2591 status);
2592 goto error;
2593 } else
2594 dbg("CLK_MULTI_REGISTER Writing success status%d\n",
2595 status);
2596
2597 /* write value 0x0 to scratchpad register */
2598 Data = 0x00;
2599 status = mos7840_set_uart_reg(serial->port[i],
2600 SCRATCH_PAD_REGISTER, Data);
2601 if (status < 0) {
2602 dbg("Writing SCRATCH_PAD_REGISTER failed status-0x%x\n",
2603 status);
2604 break;
2605 } else
2606 dbg("SCRATCH_PAD_REGISTER Writing success status%d\n",
2607 status);
2608
2609 /* Zero Length flag register */
2610 if ((mos7840_port->port_num != 1)
2611 && (serial->num_ports == 2)) {
2612
2613 Data = 0xff;
2614 status = mos7840_set_reg_sync(serial->port[i],
2615 (__u16) (ZLP_REG1 +
2616 ((__u16)mos7840_port->port_num)), Data);
2617 dbg("ZLIP offset%x\n",
2618 (__u16) (ZLP_REG1 +
2619 ((__u16) mos7840_port->port_num)));
2620 if (status < 0) {
2621 dbg("Writing ZLP_REG%d failed status-0x%x\n",
2622 i + 2, status);
2623 break;
2624 } else
2625 dbg("ZLP_REG%d Writing success status%d\n",
2626 i + 2, status);
2627 } else {
2628 Data = 0xff;
2629 status = mos7840_set_reg_sync(serial->port[i],
2630 (__u16) (ZLP_REG1 +
2631 ((__u16)mos7840_port->port_num) - 0x1), Data);
2632 dbg("ZLIP offset%x\n",
2633 (__u16) (ZLP_REG1 +
2634 ((__u16) mos7840_port->port_num) - 0x1));
2635 if (status < 0) {
2636 dbg("Writing ZLP_REG%d failed status-0x%x\n",
2637 i + 1, status);
2638 break;
2639 } else
2640 dbg("ZLP_REG%d Writing success status%d\n",
2641 i + 1, status);
2642
2643 }
2644 mos7840_port->control_urb = usb_alloc_urb(0, GFP_KERNEL);
2645 mos7840_port->ctrl_buf = kmalloc(16, GFP_KERNEL);
2646 mos7840_port->dr = kmalloc(sizeof(struct usb_ctrlrequest),
2647 GFP_KERNEL);
2648 if (!mos7840_port->control_urb || !mos7840_port->ctrl_buf ||
2649 !mos7840_port->dr) {
2650 status = -ENOMEM;
2651 goto error;
2652 }
2653 }
2654
2655 /* Zero Length flag enable */
2656 Data = 0x0f;
2657 status = mos7840_set_reg_sync(serial->port[0], ZLP_REG5, Data);
2658 if (status < 0) {
2659 dbg("Writing ZLP_REG5 failed status-0x%x\n", status);
2660 goto error;
2661 } else
2662 dbg("ZLP_REG5 Writing success status%d\n", status);
2663
2664 /* setting configuration feature to one */
2665 usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0),
2666 (__u8) 0x03, 0x00, 0x01, 0x00, NULL, 0x00, 5 * HZ);
2667 return 0;
2668 error:
2669 for (/* nothing */; i >= 0; i--) {
2670 mos7840_port = mos7840_get_port_private(serial->port[i]);
2671
2672 kfree(mos7840_port->dr);
2673 kfree(mos7840_port->ctrl_buf);
2674 usb_free_urb(mos7840_port->control_urb);
2675 kfree(mos7840_port);
2676 serial->port[i] = NULL;
2677 }
2678 return status;
2679 }
2680
2681 /****************************************************************************
2682 * mos7840_shutdown
2683 * This function is called whenever the device is removed from the usb bus.
2684 ****************************************************************************/
2685
2686 static void mos7840_shutdown(struct usb_serial *serial)
2687 {
2688 int i;
2689 unsigned long flags;
2690 struct moschip_port *mos7840_port;
2691 dbg("%s \n", " shutdown :entering..........");
2692
2693 if (!serial) {
2694 dbg("%s", "Invalid Handler \n");
2695 return;
2696 }
2697
2698 /* check for the ports to be closed,close the ports and disconnect */
2699
2700 /* free private structure allocated for serial port *
2701 * stop reads and writes on all ports */
2702
2703 for (i = 0; i < serial->num_ports; ++i) {
2704 mos7840_port = mos7840_get_port_private(serial->port[i]);
2705 dbg ("mos7840_port %d = %p", i, mos7840_port);
2706 if (mos7840_port) {
2707 spin_lock_irqsave(&mos7840_port->pool_lock, flags);
2708 mos7840_port->zombie = 1;
2709 spin_unlock_irqrestore(&mos7840_port->pool_lock, flags);
2710 usb_kill_urb(mos7840_port->control_urb);
2711 kfree(mos7840_port->ctrl_buf);
2712 kfree(mos7840_port->dr);
2713 kfree(mos7840_port);
2714 }
2715 mos7840_set_port_private(serial->port[i], NULL);
2716 }
2717
2718 dbg("%s\n", "Thank u :: ");
2719
2720 }
2721
2722 static struct usb_driver io_driver = {
2723 .name = "mos7840",
2724 .probe = usb_serial_probe,
2725 .disconnect = usb_serial_disconnect,
2726 .id_table = moschip_id_table_combined,
2727 .no_dynamic_id = 1,
2728 };
2729
2730 static struct usb_serial_driver moschip7840_4port_device = {
2731 .driver = {
2732 .owner = THIS_MODULE,
2733 .name = "mos7840",
2734 },
2735 .description = DRIVER_DESC,
2736 .usb_driver = &io_driver,
2737 .id_table = moschip_port_id_table,
2738 .num_ports = 4,
2739 .open = mos7840_open,
2740 .close = mos7840_close,
2741 .write = mos7840_write,
2742 .write_room = mos7840_write_room,
2743 .chars_in_buffer = mos7840_chars_in_buffer,
2744 .throttle = mos7840_throttle,
2745 .unthrottle = mos7840_unthrottle,
2746 .calc_num_ports = mos7840_calc_num_ports,
2747 #ifdef MCSSerialProbe
2748 .probe = mos7840_serial_probe,
2749 #endif
2750 .ioctl = mos7840_ioctl,
2751 .set_termios = mos7840_set_termios,
2752 .break_ctl = mos7840_break,
2753 .tiocmget = mos7840_tiocmget,
2754 .tiocmset = mos7840_tiocmset,
2755 .attach = mos7840_startup,
2756 .shutdown = mos7840_shutdown,
2757 .read_bulk_callback = mos7840_bulk_in_callback,
2758 .read_int_callback = mos7840_interrupt_callback,
2759 };
2760
2761 /****************************************************************************
2762 * moschip7840_init
2763 * This is called by the module subsystem, or on startup to initialize us
2764 ****************************************************************************/
2765 static int __init moschip7840_init(void)
2766 {
2767 int retval;
2768
2769 dbg("%s \n", " mos7840_init :entering..........");
2770
2771 /* Register with the usb serial */
2772 retval = usb_serial_register(&moschip7840_4port_device);
2773
2774 if (retval)
2775 goto failed_port_device_register;
2776
2777 dbg("%s\n", "Entring...");
2778 printk(KERN_INFO KBUILD_MODNAME ": " DRIVER_VERSION ":"
2779 DRIVER_DESC "\n");
2780
2781 /* Register with the usb */
2782 retval = usb_register(&io_driver);
2783 if (retval == 0) {
2784 dbg("%s\n", "Leaving...");
2785 return 0;
2786 }
2787 usb_serial_deregister(&moschip7840_4port_device);
2788 failed_port_device_register:
2789 return retval;
2790 }
2791
2792 /****************************************************************************
2793 * moschip7840_exit
2794 * Called when the driver is about to be unloaded.
2795 ****************************************************************************/
2796 static void __exit moschip7840_exit(void)
2797 {
2798
2799 dbg("%s \n", " mos7840_exit :entering..........");
2800
2801 usb_deregister(&io_driver);
2802
2803 usb_serial_deregister(&moschip7840_4port_device);
2804
2805 dbg("%s\n", "Entring...");
2806 }
2807
2808 module_init(moschip7840_init);
2809 module_exit(moschip7840_exit);
2810
2811 /* Module information */
2812 MODULE_DESCRIPTION(DRIVER_DESC);
2813 MODULE_LICENSE("GPL");
2814
2815 module_param(debug, bool, S_IRUGO | S_IWUSR);
2816 MODULE_PARM_DESC(debug, "Debug enabled or not");
Linux kernel - Deliverables
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