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Merge commit 'v2.6.27-rc3' into x86/prototypes
[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 "1.3.1"
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
273 to be Or'ed */
274 if (port->serial->num_ports == 4) {
275 val |= (((__u16) port->number -
276 (__u16) (port->serial->minor)) + 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 |= (((__u16) port->number -
281 (__u16) (port->serial->minor)) + 1) << 8;
282 dbg("mos7840_set_uart_reg application number is %x\n",
283 val);
284 } else {
285 val |=
286 (((__u16) port->number -
287 (__u16) (port->serial->minor)) + 2) << 8;
288 dbg("mos7840_set_uart_reg application number is %x\n",
289 val);
290 }
291 }
292 return usb_control_msg(dev, usb_sndctrlpipe(dev, 0), MCS_WRREQ,
293 MCS_WR_RTYPE, val, reg, NULL, 0,
294 MOS_WDR_TIMEOUT);
295
296 }
297
298 /*
299 * mos7840_get_uart_reg
300 * To set the Control register by calling usb_fill_control_urb function
301 * by passing usb_rcvctrlpipe function as parameter.
302 */
303 static int mos7840_get_uart_reg(struct usb_serial_port *port, __u16 reg,
304 __u16 *val)
305 {
306 struct usb_device *dev = port->serial->dev;
307 int ret = 0;
308 __u16 Wval;
309
310 /* dbg("application number is %4x \n",
311 (((__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 = (((__u16) port->number -
321 (__u16) (port->serial->minor)) + 1) << 8;
322 dbg("mos7840_get_uart_reg application number is %x\n",
323 Wval);
324 } else {
325 Wval = (((__u16) port->number -
326 (__u16) (port->serial->minor)) + 2) << 8;
327 dbg("mos7840_get_uart_reg application number is %x\n",
328 Wval);
329 }
330 }
331 ret = usb_control_msg(dev, usb_rcvctrlpipe(dev, 0), MCS_RDREQ,
332 MCS_RD_RTYPE, Wval, reg, val, VENDOR_READ_LENGTH,
333 MOS_WDR_TIMEOUT);
334 *val = (*val) & 0x00ff;
335 return ret;
336 }
337
338 static void mos7840_dump_serial_port(struct moschip_port *mos7840_port)
339 {
340
341 dbg("***************************************\n");
342 dbg("SpRegOffset is %2x\n", mos7840_port->SpRegOffset);
343 dbg("ControlRegOffset is %2x \n", mos7840_port->ControlRegOffset);
344 dbg("DCRRegOffset is %2x \n", mos7840_port->DcrRegOffset);
345 dbg("***************************************\n");
346
347 }
348
349 /************************************************************************/
350 /************************************************************************/
351 /* I N T E R F A C E F U N C T I O N S */
352 /* I N T E R F A C E F U N C T I O N S */
353 /************************************************************************/
354 /************************************************************************/
355
356 static inline void mos7840_set_port_private(struct usb_serial_port *port,
357 struct moschip_port *data)
358 {
359 usb_set_serial_port_data(port, (void *)data);
360 }
361
362 static inline struct moschip_port *mos7840_get_port_private(struct
363 usb_serial_port
364 *port)
365 {
366 return (struct moschip_port *)usb_get_serial_port_data(port);
367 }
368
369 static void mos7840_handle_new_msr(struct moschip_port *port, __u8 new_msr)
370 {
371 struct moschip_port *mos7840_port;
372 struct async_icount *icount;
373 mos7840_port = port;
374 icount = &mos7840_port->icount;
375 if (new_msr &
376 (MOS_MSR_DELTA_CTS | MOS_MSR_DELTA_DSR | MOS_MSR_DELTA_RI |
377 MOS_MSR_DELTA_CD)) {
378 icount = &mos7840_port->icount;
379
380 /* update input line counters */
381 if (new_msr & MOS_MSR_DELTA_CTS) {
382 icount->cts++;
383 smp_wmb();
384 }
385 if (new_msr & MOS_MSR_DELTA_DSR) {
386 icount->dsr++;
387 smp_wmb();
388 }
389 if (new_msr & MOS_MSR_DELTA_CD) {
390 icount->dcd++;
391 smp_wmb();
392 }
393 if (new_msr & MOS_MSR_DELTA_RI) {
394 icount->rng++;
395 smp_wmb();
396 }
397 }
398 }
399
400 static void mos7840_handle_new_lsr(struct moschip_port *port, __u8 new_lsr)
401 {
402 struct async_icount *icount;
403
404 dbg("%s - %02x", __func__, new_lsr);
405
406 if (new_lsr & SERIAL_LSR_BI) {
407 /*
408 * Parity and Framing errors only count if they
409 * occur exclusive of a break being
410 * received.
411 */
412 new_lsr &= (__u8) (SERIAL_LSR_OE | SERIAL_LSR_BI);
413 }
414
415 /* update input line counters */
416 icount = &port->icount;
417 if (new_lsr & SERIAL_LSR_BI) {
418 icount->brk++;
419 smp_wmb();
420 }
421 if (new_lsr & SERIAL_LSR_OE) {
422 icount->overrun++;
423 smp_wmb();
424 }
425 if (new_lsr & SERIAL_LSR_PE) {
426 icount->parity++;
427 smp_wmb();
428 }
429 if (new_lsr & SERIAL_LSR_FE) {
430 icount->frame++;
431 smp_wmb();
432 }
433 }
434
435 /************************************************************************/
436 /************************************************************************/
437 /* U S B C A L L B A C K F U N C T I O N S */
438 /* U S B C A L L B A C K F U N C T I O N S */
439 /************************************************************************/
440 /************************************************************************/
441
442 static void mos7840_control_callback(struct urb *urb)
443 {
444 unsigned char *data;
445 struct moschip_port *mos7840_port;
446 __u8 regval = 0x0;
447 int result = 0;
448 int status = urb->status;
449
450 mos7840_port = urb->context;
451
452 switch (status) {
453 case 0:
454 /* success */
455 break;
456 case -ECONNRESET:
457 case -ENOENT:
458 case -ESHUTDOWN:
459 /* this urb is terminated, clean up */
460 dbg("%s - urb shutting down with status: %d", __func__,
461 status);
462 return;
463 default:
464 dbg("%s - nonzero urb status received: %d", __func__,
465 status);
466 goto exit;
467 }
468
469 dbg("%s urb buffer size is %d\n", __func__, urb->actual_length);
470 dbg("%s mos7840_port->MsrLsr is %d port %d\n", __func__,
471 mos7840_port->MsrLsr, mos7840_port->port_num);
472 data = urb->transfer_buffer;
473 regval = (__u8) data[0];
474 dbg("%s data is %x\n", __func__, regval);
475 if (mos7840_port->MsrLsr == 0)
476 mos7840_handle_new_msr(mos7840_port, regval);
477 else if (mos7840_port->MsrLsr == 1)
478 mos7840_handle_new_lsr(mos7840_port, regval);
479
480 exit:
481 spin_lock(&mos7840_port->pool_lock);
482 if (!mos7840_port->zombie)
483 result = usb_submit_urb(mos7840_port->int_urb, GFP_ATOMIC);
484 spin_unlock(&mos7840_port->pool_lock);
485 if (result) {
486 dev_err(&urb->dev->dev,
487 "%s - Error %d submitting interrupt urb\n",
488 __func__, result);
489 }
490 }
491
492 static int mos7840_get_reg(struct moschip_port *mcs, __u16 Wval, __u16 reg,
493 __u16 *val)
494 {
495 struct usb_device *dev = mcs->port->serial->dev;
496 struct usb_ctrlrequest *dr = mcs->dr;
497 unsigned char *buffer = mcs->ctrl_buf;
498 int ret;
499
500 dr->bRequestType = MCS_RD_RTYPE;
501 dr->bRequest = MCS_RDREQ;
502 dr->wValue = cpu_to_le16(Wval); /* 0 */
503 dr->wIndex = cpu_to_le16(reg);
504 dr->wLength = cpu_to_le16(2);
505
506 usb_fill_control_urb(mcs->control_urb, dev, usb_rcvctrlpipe(dev, 0),
507 (unsigned char *)dr, buffer, 2,
508 mos7840_control_callback, mcs);
509 mcs->control_urb->transfer_buffer_length = 2;
510 ret = usb_submit_urb(mcs->control_urb, GFP_ATOMIC);
511 return ret;
512 }
513
514 /*****************************************************************************
515 * mos7840_interrupt_callback
516 * this is the callback function for when we have received data on the
517 * interrupt endpoint.
518 *****************************************************************************/
519
520 static void mos7840_interrupt_callback(struct urb *urb)
521 {
522 int result;
523 int length;
524 struct moschip_port *mos7840_port;
525 struct usb_serial *serial;
526 __u16 Data;
527 unsigned char *data;
528 __u8 sp[5], st;
529 int i, rv = 0;
530 __u16 wval, wreg = 0;
531 int status = urb->status;
532
533 dbg("%s", " : Entering\n");
534
535 switch (status) {
536 case 0:
537 /* success */
538 break;
539 case -ECONNRESET:
540 case -ENOENT:
541 case -ESHUTDOWN:
542 /* this urb is terminated, clean up */
543 dbg("%s - urb shutting down with status: %d", __func__,
544 status);
545 return;
546 default:
547 dbg("%s - nonzero urb status received: %d", __func__,
548 status);
549 goto exit;
550 }
551
552 length = urb->actual_length;
553 data = urb->transfer_buffer;
554
555 serial = urb->context;
556
557 /* Moschip get 5 bytes
558 * Byte 1 IIR Port 1 (port.number is 0)
559 * Byte 2 IIR Port 2 (port.number is 1)
560 * Byte 3 IIR Port 3 (port.number is 2)
561 * Byte 4 IIR Port 4 (port.number is 3)
562 * Byte 5 FIFO status for both */
563
564 if (length && length > 5) {
565 dbg("%s \n", "Wrong data !!!");
566 return;
567 }
568
569 sp[0] = (__u8) data[0];
570 sp[1] = (__u8) data[1];
571 sp[2] = (__u8) data[2];
572 sp[3] = (__u8) data[3];
573 st = (__u8) data[4];
574
575 for (i = 0; i < serial->num_ports; i++) {
576 mos7840_port = mos7840_get_port_private(serial->port[i]);
577 wval =
578 (((__u16) serial->port[i]->number -
579 (__u16) (serial->minor)) + 1) << 8;
580 if (mos7840_port->open) {
581 if (sp[i] & 0x01) {
582 dbg("SP%d No Interrupt !!!\n", i);
583 } else {
584 switch (sp[i] & 0x0f) {
585 case SERIAL_IIR_RLS:
586 dbg("Serial Port %d: Receiver status error or ", i);
587 dbg("address bit detected in 9-bit mode\n");
588 mos7840_port->MsrLsr = 1;
589 wreg = LINE_STATUS_REGISTER;
590 break;
591 case SERIAL_IIR_MS:
592 dbg("Serial Port %d: Modem status change\n", i);
593 mos7840_port->MsrLsr = 0;
594 wreg = MODEM_STATUS_REGISTER;
595 break;
596 }
597 spin_lock(&mos7840_port->pool_lock);
598 if (!mos7840_port->zombie) {
599 rv = mos7840_get_reg(mos7840_port, wval, wreg, &Data);
600 } else {
601 spin_unlock(&mos7840_port->pool_lock);
602 return;
603 }
604 spin_unlock(&mos7840_port->pool_lock);
605 }
606 }
607 }
608 if (!(rv < 0))
609 /* the completion handler for the control urb will resubmit */
610 return;
611 exit:
612 result = usb_submit_urb(urb, GFP_ATOMIC);
613 if (result) {
614 dev_err(&urb->dev->dev,
615 "%s - Error %d submitting interrupt urb\n",
616 __func__, result);
617 }
618 }
619
620 static int mos7840_port_paranoia_check(struct usb_serial_port *port,
621 const char *function)
622 {
623 if (!port) {
624 dbg("%s - port == NULL", function);
625 return -1;
626 }
627 if (!port->serial) {
628 dbg("%s - port->serial == NULL", function);
629 return -1;
630 }
631
632 return 0;
633 }
634
635 /* Inline functions to check the sanity of a pointer that is passed to us */
636 static int mos7840_serial_paranoia_check(struct usb_serial *serial,
637 const char *function)
638 {
639 if (!serial) {
640 dbg("%s - serial == NULL", function);
641 return -1;
642 }
643 if (!serial->type) {
644 dbg("%s - serial->type == NULL!", function);
645 return -1;
646 }
647
648 return 0;
649 }
650
651 static struct usb_serial *mos7840_get_usb_serial(struct usb_serial_port *port,
652 const char *function)
653 {
654 /* if no port was specified, or it fails a paranoia check */
655 if (!port ||
656 mos7840_port_paranoia_check(port, function) ||
657 mos7840_serial_paranoia_check(port->serial, function)) {
658 /* then say that we don't have a valid usb_serial thing,
659 * which will end up genrating -ENODEV return values */
660 return NULL;
661 }
662
663 return port->serial;
664 }
665
666 /*****************************************************************************
667 * mos7840_bulk_in_callback
668 * this is the callback function for when we have received data on the
669 * bulk in endpoint.
670 *****************************************************************************/
671
672 static void mos7840_bulk_in_callback(struct urb *urb)
673 {
674 int retval;
675 unsigned char *data;
676 struct usb_serial *serial;
677 struct usb_serial_port *port;
678 struct moschip_port *mos7840_port;
679 struct tty_struct *tty;
680 int status = urb->status;
681
682 if (status) {
683 dbg("nonzero read bulk status received: %d", status);
684 return;
685 }
686
687 mos7840_port = urb->context;
688 if (!mos7840_port) {
689 dbg("%s", "NULL mos7840_port pointer \n");
690 return;
691 }
692
693 port = (struct usb_serial_port *)mos7840_port->port;
694 if (mos7840_port_paranoia_check(port, __func__)) {
695 dbg("%s", "Port Paranoia failed \n");
696 return;
697 }
698
699 serial = mos7840_get_usb_serial(port, __func__);
700 if (!serial) {
701 dbg("%s\n", "Bad serial pointer ");
702 return;
703 }
704
705 dbg("%s\n", "Entering... \n");
706
707 data = urb->transfer_buffer;
708
709 dbg("%s", "Entering ........... \n");
710
711 if (urb->actual_length) {
712 tty = mos7840_port->port->port.tty;
713 if (tty) {
714 tty_buffer_request_room(tty, urb->actual_length);
715 tty_insert_flip_string(tty, data, urb->actual_length);
716 dbg(" %s \n", data);
717 tty_flip_buffer_push(tty);
718 }
719 mos7840_port->icount.rx += urb->actual_length;
720 smp_wmb();
721 dbg("mos7840_port->icount.rx is %d:\n",
722 mos7840_port->icount.rx);
723 }
724
725 if (!mos7840_port->read_urb) {
726 dbg("%s", "URB KILLED !!!\n");
727 return;
728 }
729
730
731 mos7840_port->read_urb->dev = serial->dev;
732
733 retval = usb_submit_urb(mos7840_port->read_urb, GFP_ATOMIC);
734
735 if (retval) {
736 dbg(" usb_submit_urb(read bulk) failed, retval = %d",
737 retval);
738 }
739 }
740
741 /*****************************************************************************
742 * mos7840_bulk_out_data_callback
743 * this is the callback function for when we have finished sending
744 * serial data on the bulk out endpoint.
745 *****************************************************************************/
746
747 static void mos7840_bulk_out_data_callback(struct urb *urb)
748 {
749 struct moschip_port *mos7840_port;
750 struct tty_struct *tty;
751 int status = urb->status;
752 int i;
753
754 mos7840_port = urb->context;
755 spin_lock(&mos7840_port->pool_lock);
756 for (i = 0; i < NUM_URBS; i++) {
757 if (urb == mos7840_port->write_urb_pool[i]) {
758 mos7840_port->busy[i] = 0;
759 break;
760 }
761 }
762 spin_unlock(&mos7840_port->pool_lock);
763
764 if (status) {
765 dbg("nonzero write bulk status received:%d\n", status);
766 return;
767 }
768
769 if (mos7840_port_paranoia_check(mos7840_port->port, __func__)) {
770 dbg("%s", "Port Paranoia failed \n");
771 return;
772 }
773
774 dbg("%s \n", "Entering .........");
775
776 tty = mos7840_port->port->port.tty;
777
778 if (tty && mos7840_port->open)
779 tty_wakeup(tty);
780
781 }
782
783 /************************************************************************/
784 /* 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 */
785 /************************************************************************/
786 #ifdef MCSSerialProbe
787 static int mos7840_serial_probe(struct usb_serial *serial,
788 const struct usb_device_id *id)
789 {
790
791 /*need to implement the mode_reg reading and updating\
792 structures usb_serial_ device_type\
793 (i.e num_ports, num_bulkin,bulkout etc) */
794 /* Also we can update the changes attach */
795 return 1;
796 }
797 #endif
798
799 /*****************************************************************************
800 * mos7840_open
801 * this function is called by the tty driver when a port is opened
802 * If successful, we return 0
803 * Otherwise we return a negative error number.
804 *****************************************************************************/
805
806 static int mos7840_open(struct tty_struct *tty,
807 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,
851 GFP_KERNEL);
852 if (!urb->transfer_buffer) {
853 usb_free_urb(urb);
854 mos7840_port->write_urb_pool[j] = NULL;
855 err("%s-out of memory for urb buffers.", __func__);
856 continue;
857 }
858 }
859
860 /*****************************************************************************
861 * Initialize MCS7840 -- Write Init values to corresponding Registers
862 *
863 * Register Index
864 * 1 : IER
865 * 2 : FCR
866 * 3 : LCR
867 * 4 : MCR
868 *
869 * 0x08 : SP1/2 Control Reg
870 *****************************************************************************/
871
872 /* NEED to check the following Block */
873
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 Data = 0x0;
896 status = mos7840_get_reg_sync(port, mos7840_port->ControlRegOffset,
897 &Data);
898 if (status < 0) {
899 dbg("Reading Controlreg failed\n");
900 return -1;
901 }
902 Data |= 0x08; /* Driver done bit */
903 Data |= 0x20; /* rx_disable */
904 status = mos7840_set_reg_sync(port,
905 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 Data = 0x00;
916 status = mos7840_set_uart_reg(port, INTERRUPT_ENABLE_REGISTER, Data);
917 if (status < 0) {
918 dbg("disableing interrupts failed\n");
919 return -1;
920 }
921 /* Set FIFO_CONTROL_REGISTER to the default value */
922 Data = 0x00;
923 status = mos7840_set_uart_reg(port, FIFO_CONTROL_REGISTER, Data);
924 if (status < 0) {
925 dbg("Writing FIFO_CONTROL_REGISTER failed\n");
926 return -1;
927 }
928
929 Data = 0xcf;
930 status = mos7840_set_uart_reg(port, FIFO_CONTROL_REGISTER, Data);
931 if (status < 0) {
932 dbg("Writing FIFO_CONTROL_REGISTER failed\n");
933 return -1;
934 }
935
936 Data = 0x03;
937 status = mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data);
938 mos7840_port->shadowLCR = Data;
939
940 Data = 0x0b;
941 status = mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER, Data);
942 mos7840_port->shadowMCR = Data;
943
944 Data = 0x00;
945 status = mos7840_get_uart_reg(port, LINE_CONTROL_REGISTER, &Data);
946 mos7840_port->shadowLCR = Data;
947
948 Data |= SERIAL_LCR_DLAB; /* data latch enable in LCR 0x80 */
949 status = mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data);
950
951 Data = 0x0c;
952 status = mos7840_set_uart_reg(port, DIVISOR_LATCH_LSB, Data);
953
954 Data = 0x0;
955 status = mos7840_set_uart_reg(port, DIVISOR_LATCH_MSB, Data);
956
957 Data = 0x00;
958 status = mos7840_get_uart_reg(port, LINE_CONTROL_REGISTER, &Data);
959
960 Data = Data & ~SERIAL_LCR_DLAB;
961 status = mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data);
962 mos7840_port->shadowLCR = Data;
963
964 /* clearing Bulkin and Bulkout Fifo */
965 Data = 0x0;
966 status = mos7840_get_reg_sync(port, mos7840_port->SpRegOffset, &Data);
967
968 Data = Data | 0x0c;
969 status = mos7840_set_reg_sync(port, mos7840_port->SpRegOffset, Data);
970
971 Data = Data & ~0x0c;
972 status = mos7840_set_reg_sync(port, mos7840_port->SpRegOffset, Data);
973 /* Finally enable all interrupts */
974 Data = 0x0c;
975 status = mos7840_set_uart_reg(port, INTERRUPT_ENABLE_REGISTER, Data);
976
977 /* clearing rx_disable */
978 Data = 0x0;
979 status = mos7840_get_reg_sync(port, mos7840_port->ControlRegOffset,
980 &Data);
981 Data = Data & ~0x20;
982 status = mos7840_set_reg_sync(port, mos7840_port->ControlRegOffset,
983 Data);
984
985 /* rx_negate */
986 Data = 0x0;
987 status = mos7840_get_reg_sync(port, mos7840_port->ControlRegOffset,
988 &Data);
989 Data = Data | 0x10;
990 status = mos7840_set_reg_sync(port, mos7840_port->ControlRegOffset,
991 Data);
992
993 /* force low_latency on so that our tty_push actually forces *
994 * the data through,otherwise it is scheduled, and with *
995 * high data rates (like with OHCI) data can get lost. */
996 if (tty)
997 tty->low_latency = 1;
998
999 /* Check to see if we've set up our endpoint info yet *
1000 * (can't set it up in mos7840_startup as the structures *
1001 * were not set up at that time.) */
1002 if (port0->open_ports == 1) {
1003 if (serial->port[0]->interrupt_in_buffer == NULL) {
1004 /* set up interrupt urb */
1005 usb_fill_int_urb(serial->port[0]->interrupt_in_urb,
1006 serial->dev,
1007 usb_rcvintpipe(serial->dev,
1008 serial->port[0]->interrupt_in_endpointAddress),
1009 serial->port[0]->interrupt_in_buffer,
1010 serial->port[0]->interrupt_in_urb->
1011 transfer_buffer_length,
1012 mos7840_interrupt_callback,
1013 serial,
1014 serial->port[0]->interrupt_in_urb->interval);
1015
1016 /* start interrupt read for mos7840 *
1017 * will continue as long as mos7840 is connected */
1018
1019 response =
1020 usb_submit_urb(serial->port[0]->interrupt_in_urb,
1021 GFP_KERNEL);
1022 if (response) {
1023 err("%s - Error %d submitting interrupt urb",
1024 __func__, response);
1025 }
1026
1027 }
1028
1029 }
1030
1031 /* see if we've set up our endpoint info yet *
1032 * (can't set it up in mos7840_startup as the *
1033 * structures were not set up at that time.) */
1034
1035 dbg("port number is %d \n", port->number);
1036 dbg("serial number is %d \n", port->serial->minor);
1037 dbg("Bulkin endpoint is %d \n", port->bulk_in_endpointAddress);
1038 dbg("BulkOut endpoint is %d \n", port->bulk_out_endpointAddress);
1039 dbg("Interrupt endpoint is %d \n", port->interrupt_in_endpointAddress);
1040 dbg("port's number in the device is %d\n", mos7840_port->port_num);
1041 mos7840_port->read_urb = port->read_urb;
1042
1043 /* set up our bulk in urb */
1044
1045 usb_fill_bulk_urb(mos7840_port->read_urb,
1046 serial->dev,
1047 usb_rcvbulkpipe(serial->dev,
1048 port->bulk_in_endpointAddress),
1049 port->bulk_in_buffer,
1050 mos7840_port->read_urb->transfer_buffer_length,
1051 mos7840_bulk_in_callback, mos7840_port);
1052
1053 dbg("mos7840_open: bulkin endpoint is %d\n",
1054 port->bulk_in_endpointAddress);
1055 response = usb_submit_urb(mos7840_port->read_urb, GFP_KERNEL);
1056 if (response) {
1057 err("%s - Error %d submitting control urb", __func__,
1058 response);
1059 }
1060
1061 /* initialize our wait queues */
1062 init_waitqueue_head(&mos7840_port->wait_chase);
1063 init_waitqueue_head(&mos7840_port->delta_msr_wait);
1064
1065 /* initialize our icount structure */
1066 memset(&(mos7840_port->icount), 0x00, sizeof(mos7840_port->icount));
1067
1068 /* initialize our port settings */
1069 /* Must set to enable ints! */
1070 mos7840_port->shadowMCR = MCR_MASTER_IE;
1071 /* send a open port command */
1072 mos7840_port->open = 1;
1073 /* mos7840_change_port_settings(mos7840_port,old_termios); */
1074 mos7840_port->icount.tx = 0;
1075 mos7840_port->icount.rx = 0;
1076
1077 dbg("\n\nusb_serial serial:%p mos7840_port:%p\n usb_serial_port port:%p\n\n",
1078 serial, mos7840_port, port);
1079
1080 return 0;
1081
1082 }
1083
1084 /*****************************************************************************
1085 * mos7840_chars_in_buffer
1086 * this function is called by the tty driver when it wants to know how many
1087 * bytes of data we currently have outstanding in the port (data that has
1088 * been written, but hasn't made it out the port yet)
1089 * If successful, we return the number of bytes left to be written in the
1090 * system,
1091 * Otherwise we return zero.
1092 *****************************************************************************/
1093
1094 static int mos7840_chars_in_buffer(struct tty_struct *tty)
1095 {
1096 struct usb_serial_port *port = tty->driver_data;
1097 int i;
1098 int chars = 0;
1099 unsigned long flags;
1100 struct moschip_port *mos7840_port;
1101
1102 dbg("%s \n", " mos7840_chars_in_buffer:entering ...........");
1103
1104 if (mos7840_port_paranoia_check(port, __func__)) {
1105 dbg("%s", "Invalid port \n");
1106 return 0;
1107 }
1108
1109 mos7840_port = mos7840_get_port_private(port);
1110 if (mos7840_port == NULL) {
1111 dbg("%s \n", "mos7840_break:leaving ...........");
1112 return 0;
1113 }
1114
1115 spin_lock_irqsave(&mos7840_port->pool_lock, flags);
1116 for (i = 0; i < NUM_URBS; ++i)
1117 if (mos7840_port->busy[i])
1118 chars += URB_TRANSFER_BUFFER_SIZE;
1119 spin_unlock_irqrestore(&mos7840_port->pool_lock, flags);
1120 dbg("%s - returns %d", __func__, chars);
1121 return chars;
1122
1123 }
1124
1125 /************************************************************************
1126 *
1127 * mos7840_block_until_tx_empty
1128 *
1129 * This function will block the close until one of the following:
1130 * 1. TX count are 0
1131 * 2. The mos7840 has stopped
1132 * 3. A timeout of 3 seconds without activity has expired
1133 *
1134 ************************************************************************/
1135 static void mos7840_block_until_tx_empty(struct tty_struct *tty,
1136 struct moschip_port *mos7840_port)
1137 {
1138 int timeout = HZ / 10;
1139 int wait = 30;
1140 int count;
1141
1142 while (1) {
1143
1144 count = mos7840_chars_in_buffer(tty);
1145
1146 /* Check for Buffer status */
1147 if (count <= 0)
1148 return;
1149
1150 /* Block the thread for a while */
1151 interruptible_sleep_on_timeout(&mos7840_port->wait_chase,
1152 timeout);
1153
1154 /* No activity.. count down section */
1155 wait--;
1156 if (wait == 0) {
1157 dbg("%s - TIMEOUT", __func__);
1158 return;
1159 } else {
1160 /* Reset timeout value back to seconds */
1161 wait = 30;
1162 }
1163 }
1164 }
1165
1166 /*****************************************************************************
1167 * mos7840_close
1168 * this function is called by the tty driver when a port is closed
1169 *****************************************************************************/
1170
1171 static void mos7840_close(struct tty_struct *tty,
1172 struct usb_serial_port *port, struct file *filp)
1173 {
1174 struct usb_serial *serial;
1175 struct moschip_port *mos7840_port;
1176 struct moschip_port *port0;
1177 int j;
1178 __u16 Data;
1179
1180 dbg("%s\n", "mos7840_close:entering...");
1181
1182 if (mos7840_port_paranoia_check(port, __func__)) {
1183 dbg("%s", "Port Paranoia failed \n");
1184 return;
1185 }
1186
1187 serial = mos7840_get_usb_serial(port, __func__);
1188 if (!serial) {
1189 dbg("%s", "Serial Paranoia failed \n");
1190 return;
1191 }
1192
1193 mos7840_port = mos7840_get_port_private(port);
1194 port0 = mos7840_get_port_private(serial->port[0]);
1195
1196 if (mos7840_port == NULL || port0 == NULL)
1197 return;
1198
1199 for (j = 0; j < NUM_URBS; ++j)
1200 usb_kill_urb(mos7840_port->write_urb_pool[j]);
1201
1202 /* Freeing Write URBs */
1203 for (j = 0; j < NUM_URBS; ++j) {
1204 if (mos7840_port->write_urb_pool[j]) {
1205 if (mos7840_port->write_urb_pool[j]->transfer_buffer)
1206 kfree(mos7840_port->write_urb_pool[j]->
1207 transfer_buffer);
1208
1209 usb_free_urb(mos7840_port->write_urb_pool[j]);
1210 }
1211 }
1212
1213 if (serial->dev)
1214 /* flush and block until tx is empty */
1215 mos7840_block_until_tx_empty(tty, mos7840_port);
1216
1217 /* While closing port, shutdown all bulk read, write *
1218 * and interrupt read if they exists */
1219 if (serial->dev) {
1220 if (mos7840_port->write_urb) {
1221 dbg("%s", "Shutdown bulk write\n");
1222 usb_kill_urb(mos7840_port->write_urb);
1223 }
1224 if (mos7840_port->read_urb) {
1225 dbg("%s", "Shutdown bulk read\n");
1226 usb_kill_urb(mos7840_port->read_urb);
1227 }
1228 if ((&mos7840_port->control_urb)) {
1229 dbg("%s", "Shutdown control read\n");
1230 /*/ usb_kill_urb (mos7840_port->control_urb); */
1231 }
1232 }
1233 /* if(mos7840_port->ctrl_buf != NULL) */
1234 /* kfree(mos7840_port->ctrl_buf); */
1235 port0->open_ports--;
1236 dbg("mos7840_num_open_ports in close%d:in port%d\n",
1237 port0->open_ports, port->number);
1238 if (port0->open_ports == 0) {
1239 if (serial->port[0]->interrupt_in_urb) {
1240 dbg("%s", "Shutdown interrupt_in_urb\n");
1241 usb_kill_urb(serial->port[0]->interrupt_in_urb);
1242 }
1243 }
1244
1245 if (mos7840_port->write_urb) {
1246 /* if this urb had a transfer buffer already (old tx) free it */
1247 if (mos7840_port->write_urb->transfer_buffer != NULL)
1248 kfree(mos7840_port->write_urb->transfer_buffer);
1249 usb_free_urb(mos7840_port->write_urb);
1250 }
1251
1252 Data = 0x0;
1253 mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER, Data);
1254
1255 Data = 0x00;
1256 mos7840_set_uart_reg(port, INTERRUPT_ENABLE_REGISTER, Data);
1257
1258 mos7840_port->open = 0;
1259
1260 dbg("%s \n", "Leaving ............");
1261 }
1262
1263 /************************************************************************
1264 *
1265 * mos7840_block_until_chase_response
1266 *
1267 * This function will block the close until one of the following:
1268 * 1. Response to our Chase comes from mos7840
1269 * 2. A timeout of 10 seconds without activity has expired
1270 * (1K of mos7840 data @ 2400 baud ==> 4 sec to empty)
1271 *
1272 ************************************************************************/
1273
1274 static void mos7840_block_until_chase_response(struct tty_struct *tty,
1275 struct moschip_port *mos7840_port)
1276 {
1277 int timeout = 1 * HZ;
1278 int wait = 10;
1279 int count;
1280
1281 while (1) {
1282 count = mos7840_chars_in_buffer(tty);
1283
1284 /* Check for Buffer status */
1285 if (count <= 0)
1286 return;
1287
1288 /* Block the thread for a while */
1289 interruptible_sleep_on_timeout(&mos7840_port->wait_chase,
1290 timeout);
1291 /* No activity.. count down section */
1292 wait--;
1293 if (wait == 0) {
1294 dbg("%s - TIMEOUT", __func__);
1295 return;
1296 } else {
1297 /* Reset timeout value back to seconds */
1298 wait = 10;
1299 }
1300 }
1301
1302 }
1303
1304 /*****************************************************************************
1305 * mos7840_break
1306 * this function sends a break to the port
1307 *****************************************************************************/
1308 static void mos7840_break(struct tty_struct *tty, int break_state)
1309 {
1310 struct usb_serial_port *port = tty->driver_data;
1311 unsigned char data;
1312 struct usb_serial *serial;
1313 struct moschip_port *mos7840_port;
1314
1315 dbg("%s \n", "Entering ...........");
1316 dbg("mos7840_break: Start\n");
1317
1318 if (mos7840_port_paranoia_check(port, __func__)) {
1319 dbg("%s", "Port Paranoia failed \n");
1320 return;
1321 }
1322
1323 serial = mos7840_get_usb_serial(port, __func__);
1324 if (!serial) {
1325 dbg("%s", "Serial Paranoia failed \n");
1326 return;
1327 }
1328
1329 mos7840_port = mos7840_get_port_private(port);
1330
1331 if (mos7840_port == NULL)
1332 return;
1333
1334 if (serial->dev)
1335 /* flush and block until tx is empty */
1336 mos7840_block_until_chase_response(tty, mos7840_port);
1337
1338 if (break_state == -1)
1339 data = mos7840_port->shadowLCR | LCR_SET_BREAK;
1340 else
1341 data = mos7840_port->shadowLCR & ~LCR_SET_BREAK;
1342
1343 mos7840_port->shadowLCR = data;
1344 dbg("mcs7840_break mos7840_port->shadowLCR is %x\n",
1345 mos7840_port->shadowLCR);
1346 mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER,
1347 mos7840_port->shadowLCR);
1348
1349 return;
1350 }
1351
1352 /*****************************************************************************
1353 * mos7840_write_room
1354 * this function is called by the tty driver when it wants to know how many
1355 * bytes of data we can accept for a specific port.
1356 * If successful, we return the amount of room that we have for this port
1357 * Otherwise we return a negative error number.
1358 *****************************************************************************/
1359
1360 static int mos7840_write_room(struct tty_struct *tty)
1361 {
1362 struct usb_serial_port *port = tty->driver_data;
1363 int i;
1364 int room = 0;
1365 unsigned long flags;
1366 struct moschip_port *mos7840_port;
1367
1368 dbg("%s \n", " mos7840_write_room:entering ...........");
1369
1370 if (mos7840_port_paranoia_check(port, __func__)) {
1371 dbg("%s", "Invalid port \n");
1372 dbg("%s \n", " mos7840_write_room:leaving ...........");
1373 return -1;
1374 }
1375
1376 mos7840_port = mos7840_get_port_private(port);
1377 if (mos7840_port == NULL) {
1378 dbg("%s \n", "mos7840_break:leaving ...........");
1379 return -1;
1380 }
1381
1382 spin_lock_irqsave(&mos7840_port->pool_lock, flags);
1383 for (i = 0; i < NUM_URBS; ++i) {
1384 if (!mos7840_port->busy[i])
1385 room += URB_TRANSFER_BUFFER_SIZE;
1386 }
1387 spin_unlock_irqrestore(&mos7840_port->pool_lock, flags);
1388
1389 room = (room == 0) ? 0 : room - URB_TRANSFER_BUFFER_SIZE + 1;
1390 dbg("%s - returns %d", __func__, room);
1391 return room;
1392
1393 }
1394
1395 /*****************************************************************************
1396 * mos7840_write
1397 * this function is called by the tty driver when data should be written to
1398 * the port.
1399 * If successful, we return the number of bytes written, otherwise we
1400 * return a negative error number.
1401 *****************************************************************************/
1402
1403 static int mos7840_write(struct tty_struct *tty, struct usb_serial_port *port,
1404 const unsigned char *data, int count)
1405 {
1406 int status;
1407 int i;
1408 int bytes_sent = 0;
1409 int transfer_size;
1410 unsigned long flags;
1411
1412 struct moschip_port *mos7840_port;
1413 struct usb_serial *serial;
1414 struct urb *urb;
1415 /* __u16 Data; */
1416 const unsigned char *current_position = data;
1417 unsigned char *data1;
1418 dbg("%s \n", "entering ...........");
1419 /* dbg("mos7840_write: mos7840_port->shadowLCR is %x\n",
1420 mos7840_port->shadowLCR); */
1421
1422 #ifdef NOTMOS7840
1423 Data = 0x00;
1424 status = mos7840_get_uart_reg(port, LINE_CONTROL_REGISTER, &Data);
1425 mos7840_port->shadowLCR = Data;
1426 dbg("mos7840_write: LINE_CONTROL_REGISTER is %x\n", Data);
1427 dbg("mos7840_write: mos7840_port->shadowLCR is %x\n",
1428 mos7840_port->shadowLCR);
1429
1430 /* Data = 0x03; */
1431 /* status = mos7840_set_uart_reg(port,LINE_CONTROL_REGISTER,Data); */
1432 /* mos7840_port->shadowLCR=Data;//Need to add later */
1433
1434 Data |= SERIAL_LCR_DLAB; /* data latch enable in LCR 0x80 */
1435 status = mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data);
1436
1437 /* Data = 0x0c; */
1438 /* status = mos7840_set_uart_reg(port,DIVISOR_LATCH_LSB,Data); */
1439 Data = 0x00;
1440 status = mos7840_get_uart_reg(port, DIVISOR_LATCH_LSB, &Data);
1441 dbg("mos7840_write:DLL value is %x\n", Data);
1442
1443 Data = 0x0;
1444 status = mos7840_get_uart_reg(port, DIVISOR_LATCH_MSB, &Data);
1445 dbg("mos7840_write:DLM value is %x\n", Data);
1446
1447 Data = Data & ~SERIAL_LCR_DLAB;
1448 dbg("mos7840_write: mos7840_port->shadowLCR is %x\n",
1449 mos7840_port->shadowLCR);
1450 status = mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data);
1451 #endif
1452
1453 if (mos7840_port_paranoia_check(port, __func__)) {
1454 dbg("%s", "Port Paranoia failed \n");
1455 return -1;
1456 }
1457
1458 serial = port->serial;
1459 if (mos7840_serial_paranoia_check(serial, __func__)) {
1460 dbg("%s", "Serial Paranoia failed \n");
1461 return -1;
1462 }
1463
1464 mos7840_port = mos7840_get_port_private(port);
1465 if (mos7840_port == NULL) {
1466 dbg("%s", "mos7840_port is NULL\n");
1467 return -1;
1468 }
1469
1470 /* try to find a free urb in the list */
1471 urb = NULL;
1472
1473 spin_lock_irqsave(&mos7840_port->pool_lock, flags);
1474 for (i = 0; i < NUM_URBS; ++i) {
1475 if (!mos7840_port->busy[i]) {
1476 mos7840_port->busy[i] = 1;
1477 urb = mos7840_port->write_urb_pool[i];
1478 dbg("\nURB:%d", i);
1479 break;
1480 }
1481 }
1482 spin_unlock_irqrestore(&mos7840_port->pool_lock, flags);
1483
1484 if (urb == NULL) {
1485 dbg("%s - no more free urbs", __func__);
1486 goto exit;
1487 }
1488
1489 if (urb->transfer_buffer == NULL) {
1490 urb->transfer_buffer =
1491 kmalloc(URB_TRANSFER_BUFFER_SIZE, GFP_KERNEL);
1492
1493 if (urb->transfer_buffer == NULL) {
1494 err("%s no more kernel memory...", __func__);
1495 goto exit;
1496 }
1497 }
1498 transfer_size = min(count, URB_TRANSFER_BUFFER_SIZE);
1499
1500 memcpy(urb->transfer_buffer, current_position, transfer_size);
1501
1502 /* fill urb with data and submit */
1503 usb_fill_bulk_urb(urb,
1504 serial->dev,
1505 usb_sndbulkpipe(serial->dev,
1506 port->bulk_out_endpointAddress),
1507 urb->transfer_buffer,
1508 transfer_size,
1509 mos7840_bulk_out_data_callback, mos7840_port);
1510
1511 data1 = urb->transfer_buffer;
1512 dbg("\nbulkout endpoint is %d", port->bulk_out_endpointAddress);
1513
1514 /* send it down the pipe */
1515 status = usb_submit_urb(urb, GFP_ATOMIC);
1516
1517 if (status) {
1518 mos7840_port->busy[i] = 0;
1519 err("%s - usb_submit_urb(write bulk) failed with status = %d",
1520 __func__, status);
1521 bytes_sent = status;
1522 goto exit;
1523 }
1524 bytes_sent = transfer_size;
1525 mos7840_port->icount.tx += transfer_size;
1526 smp_wmb();
1527 dbg("mos7840_port->icount.tx is %d:\n", mos7840_port->icount.tx);
1528 exit:
1529 return bytes_sent;
1530
1531 }
1532
1533 /*****************************************************************************
1534 * mos7840_throttle
1535 * this function is called by the tty driver when it wants to stop the data
1536 * being read from the port.
1537 *****************************************************************************/
1538
1539 static void mos7840_throttle(struct tty_struct *tty)
1540 {
1541 struct usb_serial_port *port = tty->driver_data;
1542 struct moschip_port *mos7840_port;
1543 int status;
1544
1545 if (mos7840_port_paranoia_check(port, __func__)) {
1546 dbg("%s", "Invalid port \n");
1547 return;
1548 }
1549
1550 dbg("- port %d\n", port->number);
1551
1552 mos7840_port = mos7840_get_port_private(port);
1553
1554 if (mos7840_port == NULL)
1555 return;
1556
1557 if (!mos7840_port->open) {
1558 dbg("%s\n", "port not opened");
1559 return;
1560 }
1561
1562 dbg("%s", "Entering .......... \n");
1563
1564 /* if we are implementing XON/XOFF, send the stop character */
1565 if (I_IXOFF(tty)) {
1566 unsigned char stop_char = STOP_CHAR(tty);
1567 status = mos7840_write(tty, port, &stop_char, 1);
1568 if (status <= 0)
1569 return;
1570 }
1571 /* if we are implementing RTS/CTS, toggle that line */
1572 if (tty->termios->c_cflag & CRTSCTS) {
1573 mos7840_port->shadowMCR &= ~MCR_RTS;
1574 status = mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER,
1575 mos7840_port->shadowMCR);
1576 if (status < 0)
1577 return;
1578 }
1579
1580 return;
1581 }
1582
1583 /*****************************************************************************
1584 * mos7840_unthrottle
1585 * this function is called by the tty driver when it wants to resume
1586 * the data being read from the port (called after mos7840_throttle is
1587 * called)
1588 *****************************************************************************/
1589 static void mos7840_unthrottle(struct tty_struct *tty)
1590 {
1591 struct usb_serial_port *port = tty->driver_data;
1592 int status;
1593 struct moschip_port *mos7840_port = mos7840_get_port_private(port);
1594
1595 if (mos7840_port_paranoia_check(port, __func__)) {
1596 dbg("%s", "Invalid port \n");
1597 return;
1598 }
1599
1600 if (mos7840_port == NULL)
1601 return;
1602
1603 if (!mos7840_port->open) {
1604 dbg("%s - port not opened", __func__);
1605 return;
1606 }
1607
1608 dbg("%s", "Entering .......... \n");
1609
1610 /* if we are implementing XON/XOFF, send the start character */
1611 if (I_IXOFF(tty)) {
1612 unsigned char start_char = START_CHAR(tty);
1613 status = mos7840_write(tty, port, &start_char, 1);
1614 if (status <= 0)
1615 return;
1616 }
1617
1618 /* if we are implementing RTS/CTS, toggle that line */
1619 if (tty->termios->c_cflag & CRTSCTS) {
1620 mos7840_port->shadowMCR |= MCR_RTS;
1621 status = mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER,
1622 mos7840_port->shadowMCR);
1623 if (status < 0)
1624 return;
1625 }
1626 }
1627
1628 static int mos7840_tiocmget(struct tty_struct *tty, struct file *file)
1629 {
1630 struct usb_serial_port *port = tty->driver_data;
1631 struct moschip_port *mos7840_port;
1632 unsigned int result;
1633 __u16 msr;
1634 __u16 mcr;
1635 int status;
1636 mos7840_port = mos7840_get_port_private(port);
1637
1638 dbg("%s - port %d", __func__, port->number);
1639
1640 if (mos7840_port == NULL)
1641 return -ENODEV;
1642
1643 status = mos7840_get_uart_reg(port, MODEM_STATUS_REGISTER, &msr);
1644 status = mos7840_get_uart_reg(port, MODEM_CONTROL_REGISTER, &mcr);
1645 result = ((mcr & MCR_DTR) ? TIOCM_DTR : 0)
1646 | ((mcr & MCR_RTS) ? TIOCM_RTS : 0)
1647 | ((mcr & MCR_LOOPBACK) ? TIOCM_LOOP : 0)
1648 | ((msr & MOS7840_MSR_CTS) ? TIOCM_CTS : 0)
1649 | ((msr & MOS7840_MSR_CD) ? TIOCM_CAR : 0)
1650 | ((msr & MOS7840_MSR_RI) ? TIOCM_RI : 0)
1651 | ((msr & MOS7840_MSR_DSR) ? TIOCM_DSR : 0);
1652
1653 dbg("%s - 0x%04X", __func__, result);
1654
1655 return result;
1656 }
1657
1658 static int mos7840_tiocmset(struct tty_struct *tty, struct file *file,
1659 unsigned int set, unsigned int clear)
1660 {
1661 struct usb_serial_port *port = tty->driver_data;
1662 struct moschip_port *mos7840_port;
1663 unsigned int mcr;
1664 int status;
1665
1666 dbg("%s - port %d", __func__, port->number);
1667
1668 mos7840_port = mos7840_get_port_private(port);
1669
1670 if (mos7840_port == NULL)
1671 return -ENODEV;
1672
1673 /* FIXME: What locks the port registers ? */
1674 mcr = mos7840_port->shadowMCR;
1675 if (clear & TIOCM_RTS)
1676 mcr &= ~MCR_RTS;
1677 if (clear & TIOCM_DTR)
1678 mcr &= ~MCR_DTR;
1679 if (clear & TIOCM_LOOP)
1680 mcr &= ~MCR_LOOPBACK;
1681
1682 if (set & TIOCM_RTS)
1683 mcr |= MCR_RTS;
1684 if (set & TIOCM_DTR)
1685 mcr |= MCR_DTR;
1686 if (set & TIOCM_LOOP)
1687 mcr |= MCR_LOOPBACK;
1688
1689 mos7840_port->shadowMCR = mcr;
1690
1691 status = mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER, mcr);
1692 if (status < 0) {
1693 dbg("setting MODEM_CONTROL_REGISTER Failed\n");
1694 return status;
1695 }
1696
1697 return 0;
1698 }
1699
1700 /*****************************************************************************
1701 * mos7840_calc_baud_rate_divisor
1702 * this function calculates the proper baud rate divisor for the specified
1703 * baud rate.
1704 *****************************************************************************/
1705 static int mos7840_calc_baud_rate_divisor(int baudRate, int *divisor,
1706 __u16 *clk_sel_val)
1707 {
1708
1709 dbg("%s - %d", __func__, baudRate);
1710
1711 if (baudRate <= 115200) {
1712 *divisor = 115200 / baudRate;
1713 *clk_sel_val = 0x0;
1714 }
1715 if ((baudRate > 115200) && (baudRate <= 230400)) {
1716 *divisor = 230400 / baudRate;
1717 *clk_sel_val = 0x10;
1718 } else if ((baudRate > 230400) && (baudRate <= 403200)) {
1719 *divisor = 403200 / baudRate;
1720 *clk_sel_val = 0x20;
1721 } else if ((baudRate > 403200) && (baudRate <= 460800)) {
1722 *divisor = 460800 / baudRate;
1723 *clk_sel_val = 0x30;
1724 } else if ((baudRate > 460800) && (baudRate <= 806400)) {
1725 *divisor = 806400 / baudRate;
1726 *clk_sel_val = 0x40;
1727 } else if ((baudRate > 806400) && (baudRate <= 921600)) {
1728 *divisor = 921600 / baudRate;
1729 *clk_sel_val = 0x50;
1730 } else if ((baudRate > 921600) && (baudRate <= 1572864)) {
1731 *divisor = 1572864 / baudRate;
1732 *clk_sel_val = 0x60;
1733 } else if ((baudRate > 1572864) && (baudRate <= 3145728)) {
1734 *divisor = 3145728 / baudRate;
1735 *clk_sel_val = 0x70;
1736 }
1737 return 0;
1738
1739 #ifdef NOTMCS7840
1740
1741 for (i = 0; i < ARRAY_SIZE(mos7840_divisor_table); i++) {
1742 if (mos7840_divisor_table[i].BaudRate == baudrate) {
1743 *divisor = mos7840_divisor_table[i].Divisor;
1744 return 0;
1745 }
1746 }
1747
1748 /* After trying for all the standard baud rates *
1749 * Try calculating the divisor for this baud rate */
1750
1751 if (baudrate > 75 && baudrate < 230400) {
1752 /* get the divisor */
1753 custom = (__u16) (230400L / baudrate);
1754
1755 /* Check for round off */
1756 round1 = (__u16) (2304000L / baudrate);
1757 round = (__u16) (round1 - (custom * 10));
1758 if (round > 4)
1759 custom++;
1760 *divisor = custom;
1761
1762 dbg(" Baud %d = %d\n", baudrate, custom);
1763 return 0;
1764 }
1765
1766 dbg("%s\n", " Baud calculation Failed...");
1767 return -1;
1768 #endif
1769 }
1770
1771 /*****************************************************************************
1772 * mos7840_send_cmd_write_baud_rate
1773 * this function sends the proper command to change the baud rate of the
1774 * specified port.
1775 *****************************************************************************/
1776
1777 static int mos7840_send_cmd_write_baud_rate(struct moschip_port *mos7840_port,
1778 int baudRate)
1779 {
1780 int divisor = 0;
1781 int status;
1782 __u16 Data;
1783 unsigned char number;
1784 __u16 clk_sel_val;
1785 struct usb_serial_port *port;
1786
1787 if (mos7840_port == NULL)
1788 return -1;
1789
1790 port = (struct usb_serial_port *)mos7840_port->port;
1791 if (mos7840_port_paranoia_check(port, __func__)) {
1792 dbg("%s", "Invalid port \n");
1793 return -1;
1794 }
1795
1796 if (mos7840_serial_paranoia_check(port->serial, __func__)) {
1797 dbg("%s", "Invalid Serial \n");
1798 return -1;
1799 }
1800
1801 dbg("%s", "Entering .......... \n");
1802
1803 number = mos7840_port->port->number - mos7840_port->port->serial->minor;
1804
1805 dbg("%s - port = %d, baud = %d", __func__,
1806 mos7840_port->port->number, baudRate);
1807 /* reset clk_uart_sel in spregOffset */
1808 if (baudRate > 115200) {
1809 #ifdef HW_flow_control
1810 /* NOTE: need to see the pther register to modify */
1811 /* setting h/w flow control bit to 1 */
1812 Data = 0x2b;
1813 mos7840_port->shadowMCR = Data;
1814 status = mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER,
1815 Data);
1816 if (status < 0) {
1817 dbg("Writing spreg failed in set_serial_baud\n");
1818 return -1;
1819 }
1820 #endif
1821
1822 } else {
1823 #ifdef HW_flow_control
1824 / *setting h/w flow control bit to 0 */
1825 Data = 0xb;
1826 mos7840_port->shadowMCR = Data;
1827 status = mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER,
1828 Data);
1829 if (status < 0) {
1830 dbg("Writing spreg failed in set_serial_baud\n");
1831 return -1;
1832 }
1833 #endif
1834
1835 }
1836
1837 if (1) { /* baudRate <= 115200) */
1838 clk_sel_val = 0x0;
1839 Data = 0x0;
1840 status = mos7840_calc_baud_rate_divisor(baudRate, &divisor,
1841 &clk_sel_val);
1842 status = mos7840_get_reg_sync(port, mos7840_port->SpRegOffset,
1843 &Data);
1844 if (status < 0) {
1845 dbg("reading spreg failed in set_serial_baud\n");
1846 return -1;
1847 }
1848 Data = (Data & 0x8f) | clk_sel_val;
1849 status = mos7840_set_reg_sync(port, mos7840_port->SpRegOffset,
1850 Data);
1851 if (status < 0) {
1852 dbg("Writing spreg failed in set_serial_baud\n");
1853 return -1;
1854 }
1855 /* Calculate the Divisor */
1856
1857 if (status) {
1858 err("%s - bad baud rate", __func__);
1859 dbg("%s\n", "bad baud rate");
1860 return status;
1861 }
1862 /* Enable access to divisor latch */
1863 Data = mos7840_port->shadowLCR | SERIAL_LCR_DLAB;
1864 mos7840_port->shadowLCR = Data;
1865 mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data);
1866
1867 /* Write the divisor */
1868 Data = (unsigned char)(divisor & 0xff);
1869 dbg("set_serial_baud Value to write DLL is %x\n", Data);
1870 mos7840_set_uart_reg(port, DIVISOR_LATCH_LSB, Data);
1871
1872 Data = (unsigned char)((divisor & 0xff00) >> 8);
1873 dbg("set_serial_baud Value to write DLM is %x\n", Data);
1874 mos7840_set_uart_reg(port, DIVISOR_LATCH_MSB, Data);
1875
1876 /* Disable access to divisor latch */
1877 Data = mos7840_port->shadowLCR & ~SERIAL_LCR_DLAB;
1878 mos7840_port->shadowLCR = Data;
1879 mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data);
1880
1881 }
1882 return status;
1883 }
1884
1885 /*****************************************************************************
1886 * mos7840_change_port_settings
1887 * This routine is called to set the UART on the device to match
1888 * the specified new settings.
1889 *****************************************************************************/
1890
1891 static void mos7840_change_port_settings(struct tty_struct *tty,
1892 struct moschip_port *mos7840_port, struct ktermios *old_termios)
1893 {
1894 int baud;
1895 unsigned cflag;
1896 unsigned iflag;
1897 __u8 lData;
1898 __u8 lParity;
1899 __u8 lStop;
1900 int status;
1901 __u16 Data;
1902 struct usb_serial_port *port;
1903 struct usb_serial *serial;
1904
1905 if (mos7840_port == NULL)
1906 return;
1907
1908 port = (struct usb_serial_port *)mos7840_port->port;
1909
1910 if (mos7840_port_paranoia_check(port, __func__)) {
1911 dbg("%s", "Invalid port \n");
1912 return;
1913 }
1914
1915 if (mos7840_serial_paranoia_check(port->serial, __func__)) {
1916 dbg("%s", "Invalid Serial \n");
1917 return;
1918 }
1919
1920 serial = port->serial;
1921
1922 dbg("%s - port %d", __func__, mos7840_port->port->number);
1923
1924 if (!mos7840_port->open) {
1925 dbg("%s - port not opened", __func__);
1926 return;
1927 }
1928
1929 dbg("%s", "Entering .......... \n");
1930
1931 lData = LCR_BITS_8;
1932 lStop = LCR_STOP_1;
1933 lParity = LCR_PAR_NONE;
1934
1935 cflag = tty->termios->c_cflag;
1936 iflag = tty->termios->c_iflag;
1937
1938 /* Change the number of bits */
1939 if (cflag & CSIZE) {
1940 switch (cflag & CSIZE) {
1941 case CS5:
1942 lData = LCR_BITS_5;
1943 break;
1944
1945 case CS6:
1946 lData = LCR_BITS_6;
1947 break;
1948
1949 case CS7:
1950 lData = LCR_BITS_7;
1951 break;
1952 default:
1953 case CS8:
1954 lData = LCR_BITS_8;
1955 break;
1956 }
1957 }
1958 /* Change the Parity bit */
1959 if (cflag & PARENB) {
1960 if (cflag & PARODD) {
1961 lParity = LCR_PAR_ODD;
1962 dbg("%s - parity = odd", __func__);
1963 } else {
1964 lParity = LCR_PAR_EVEN;
1965 dbg("%s - parity = even", __func__);
1966 }
1967
1968 } else {
1969 dbg("%s - parity = none", __func__);
1970 }
1971
1972 if (cflag & CMSPAR)
1973 lParity = lParity | 0x20;
1974
1975 /* Change the Stop bit */
1976 if (cflag & CSTOPB) {
1977 lStop = LCR_STOP_2;
1978 dbg("%s - stop bits = 2", __func__);
1979 } else {
1980 lStop = LCR_STOP_1;
1981 dbg("%s - stop bits = 1", __func__);
1982 }
1983
1984 /* Update the LCR with the correct value */
1985 mos7840_port->shadowLCR &=
1986 ~(LCR_BITS_MASK | LCR_STOP_MASK | LCR_PAR_MASK);
1987 mos7840_port->shadowLCR |= (lData | lParity | lStop);
1988
1989 dbg("mos7840_change_port_settings mos7840_port->shadowLCR is %x\n",
1990 mos7840_port->shadowLCR);
1991 /* Disable Interrupts */
1992 Data = 0x00;
1993 mos7840_set_uart_reg(port, INTERRUPT_ENABLE_REGISTER, Data);
1994
1995 Data = 0x00;
1996 mos7840_set_uart_reg(port, FIFO_CONTROL_REGISTER, Data);
1997
1998 Data = 0xcf;
1999 mos7840_set_uart_reg(port, FIFO_CONTROL_REGISTER, Data);
2000
2001 /* Send the updated LCR value to the mos7840 */
2002 Data = mos7840_port->shadowLCR;
2003
2004 mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data);
2005
2006 Data = 0x00b;
2007 mos7840_port->shadowMCR = Data;
2008 mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER, Data);
2009 Data = 0x00b;
2010 mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER, Data);
2011
2012 /* set up the MCR register and send it to the mos7840 */
2013
2014 mos7840_port->shadowMCR = MCR_MASTER_IE;
2015 if (cflag & CBAUD)
2016 mos7840_port->shadowMCR |= (MCR_DTR | MCR_RTS);
2017
2018 if (cflag & CRTSCTS)
2019 mos7840_port->shadowMCR |= (MCR_XON_ANY);
2020 else
2021 mos7840_port->shadowMCR &= ~(MCR_XON_ANY);
2022
2023 Data = mos7840_port->shadowMCR;
2024 mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER, Data);
2025
2026 /* Determine divisor based on baud rate */
2027 baud = tty_get_baud_rate(tty);
2028
2029 if (!baud) {
2030 /* pick a default, any default... */
2031 dbg("%s\n", "Picked default baud...");
2032 baud = 9600;
2033 }
2034
2035 dbg("%s - baud rate = %d", __func__, baud);
2036 status = mos7840_send_cmd_write_baud_rate(mos7840_port, baud);
2037
2038 /* Enable Interrupts */
2039 Data = 0x0c;
2040 mos7840_set_uart_reg(port, INTERRUPT_ENABLE_REGISTER, Data);
2041
2042 if (mos7840_port->read_urb->status != -EINPROGRESS) {
2043 mos7840_port->read_urb->dev = serial->dev;
2044
2045 status = usb_submit_urb(mos7840_port->read_urb, GFP_ATOMIC);
2046
2047 if (status) {
2048 dbg(" usb_submit_urb(read bulk) failed, status = %d",
2049 status);
2050 }
2051 }
2052 wake_up(&mos7840_port->delta_msr_wait);
2053 mos7840_port->delta_msr_cond = 1;
2054 dbg("mos7840_change_port_settings mos7840_port->shadowLCR is End %x\n",
2055 mos7840_port->shadowLCR);
2056
2057 return;
2058 }
2059
2060 /*****************************************************************************
2061 * mos7840_set_termios
2062 * this function is called by the tty driver when it wants to change
2063 * the termios structure
2064 *****************************************************************************/
2065
2066 static void mos7840_set_termios(struct tty_struct *tty,
2067 struct usb_serial_port *port,
2068 struct ktermios *old_termios)
2069 {
2070 int status;
2071 unsigned int cflag;
2072 struct usb_serial *serial;
2073 struct moschip_port *mos7840_port;
2074 dbg("mos7840_set_termios: START\n");
2075 if (mos7840_port_paranoia_check(port, __func__)) {
2076 dbg("%s", "Invalid port \n");
2077 return;
2078 }
2079
2080 serial = port->serial;
2081
2082 if (mos7840_serial_paranoia_check(serial, __func__)) {
2083 dbg("%s", "Invalid Serial \n");
2084 return;
2085 }
2086
2087 mos7840_port = mos7840_get_port_private(port);
2088
2089 if (mos7840_port == NULL)
2090 return;
2091
2092 if (!mos7840_port->open) {
2093 dbg("%s - port not opened", __func__);
2094 return;
2095 }
2096
2097 dbg("%s\n", "setting termios - ");
2098
2099 cflag = tty->termios->c_cflag;
2100
2101 dbg("%s - clfag %08x iflag %08x", __func__,
2102 tty->termios->c_cflag, RELEVANT_IFLAG(tty->termios->c_iflag));
2103 dbg("%s - old clfag %08x old iflag %08x", __func__,
2104 old_termios->c_cflag, RELEVANT_IFLAG(old_termios->c_iflag));
2105 dbg("%s - port %d", __func__, port->number);
2106
2107 /* change the port settings to the new ones specified */
2108
2109 mos7840_change_port_settings(tty, mos7840_port, old_termios);
2110
2111 if (!mos7840_port->read_urb) {
2112 dbg("%s", "URB KILLED !!!!!\n");
2113 return;
2114 }
2115
2116 if (mos7840_port->read_urb->status != -EINPROGRESS) {
2117 mos7840_port->read_urb->dev = serial->dev;
2118 status = usb_submit_urb(mos7840_port->read_urb, GFP_ATOMIC);
2119 if (status) {
2120 dbg(" usb_submit_urb(read bulk) failed, status = %d",
2121 status);
2122 }
2123 }
2124 return;
2125 }
2126
2127 /*****************************************************************************
2128 * mos7840_get_lsr_info - get line status register info
2129 *
2130 * Purpose: Let user call ioctl() to get info when the UART physically
2131 * is emptied. On bus types like RS485, the transmitter must
2132 * release the bus after transmitting. This must be done when
2133 * the transmit shift register is empty, not be done when the
2134 * transmit holding register is empty. This functionality
2135 * allows an RS485 driver to be written in user space.
2136 *****************************************************************************/
2137
2138 static int mos7840_get_lsr_info(struct tty_struct *tty,
2139 unsigned int __user *value)
2140 {
2141 int count;
2142 unsigned int result = 0;
2143
2144 count = mos7840_chars_in_buffer(tty);
2145 if (count == 0) {
2146 dbg("%s -- Empty", __func__);
2147 result = TIOCSER_TEMT;
2148 }
2149
2150 if (copy_to_user(value, &result, sizeof(int)))
2151 return -EFAULT;
2152 return 0;
2153 }
2154
2155 /*****************************************************************************
2156 * mos7840_set_modem_info
2157 * function to set modem info
2158 *****************************************************************************/
2159
2160 /* FIXME: Should be using the model control hooks */
2161
2162 static int mos7840_set_modem_info(struct moschip_port *mos7840_port,
2163 unsigned int cmd, unsigned int __user *value)
2164 {
2165 unsigned int mcr;
2166 unsigned int arg;
2167 __u16 Data;
2168 int status;
2169 struct usb_serial_port *port;
2170
2171 if (mos7840_port == NULL)
2172 return -1;
2173
2174 port = (struct usb_serial_port *)mos7840_port->port;
2175 if (mos7840_port_paranoia_check(port, __func__)) {
2176 dbg("%s", "Invalid port \n");
2177 return -1;
2178 }
2179
2180 mcr = mos7840_port->shadowMCR;
2181
2182 if (copy_from_user(&arg, value, sizeof(int)))
2183 return -EFAULT;
2184
2185 switch (cmd) {
2186 case TIOCMBIS:
2187 if (arg & TIOCM_RTS)
2188 mcr |= MCR_RTS;
2189 if (arg & TIOCM_DTR)
2190 mcr |= MCR_RTS;
2191 if (arg & TIOCM_LOOP)
2192 mcr |= MCR_LOOPBACK;
2193 break;
2194
2195 case TIOCMBIC:
2196 if (arg & TIOCM_RTS)
2197 mcr &= ~MCR_RTS;
2198 if (arg & TIOCM_DTR)
2199 mcr &= ~MCR_RTS;
2200 if (arg & TIOCM_LOOP)
2201 mcr &= ~MCR_LOOPBACK;
2202 break;
2203
2204 case TIOCMSET:
2205 /* turn off the RTS and DTR and LOOPBACK
2206 * and then only turn on what was asked to */
2207 mcr &= ~(MCR_RTS | MCR_DTR | MCR_LOOPBACK);
2208 mcr |= ((arg & TIOCM_RTS) ? MCR_RTS : 0);
2209 mcr |= ((arg & TIOCM_DTR) ? MCR_DTR : 0);
2210 mcr |= ((arg & TIOCM_LOOP) ? MCR_LOOPBACK : 0);
2211 break;
2212 }
2213
2214 mos7840_port->shadowMCR = mcr;
2215
2216 Data = mos7840_port->shadowMCR;
2217 status = mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER, Data);
2218 if (status < 0) {
2219 dbg("setting MODEM_CONTROL_REGISTER Failed\n");
2220 return -1;
2221 }
2222
2223 return 0;
2224 }
2225
2226 /*****************************************************************************
2227 * mos7840_get_modem_info
2228 * function to get modem info
2229 *****************************************************************************/
2230
2231 static int mos7840_get_modem_info(struct moschip_port *mos7840_port,
2232 unsigned int __user *value)
2233 {
2234 unsigned int result = 0;
2235 __u16 msr;
2236 unsigned int mcr = mos7840_port->shadowMCR;
2237 mos7840_get_uart_reg(mos7840_port->port,
2238 MODEM_STATUS_REGISTER, &msr);
2239 result = ((mcr & MCR_DTR) ? TIOCM_DTR : 0) /* 0x002 */
2240 |((mcr & MCR_RTS) ? TIOCM_RTS : 0) /* 0x004 */
2241 |((msr & MOS7840_MSR_CTS) ? TIOCM_CTS : 0) /* 0x020 */
2242 |((msr & MOS7840_MSR_CD) ? TIOCM_CAR : 0) /* 0x040 */
2243 |((msr & MOS7840_MSR_RI) ? TIOCM_RI : 0) /* 0x080 */
2244 |((msr & MOS7840_MSR_DSR) ? TIOCM_DSR : 0); /* 0x100 */
2245
2246 dbg("%s -- %x", __func__, result);
2247
2248 if (copy_to_user(value, &result, sizeof(int)))
2249 return -EFAULT;
2250 return 0;
2251 }
2252
2253 /*****************************************************************************
2254 * mos7840_get_serial_info
2255 * function to get information about serial port
2256 *****************************************************************************/
2257
2258 static int mos7840_get_serial_info(struct moschip_port *mos7840_port,
2259 struct serial_struct __user *retinfo)
2260 {
2261 struct serial_struct tmp;
2262
2263 if (mos7840_port == NULL)
2264 return -1;
2265
2266 if (!retinfo)
2267 return -EFAULT;
2268
2269 memset(&tmp, 0, sizeof(tmp));
2270
2271 tmp.type = PORT_16550A;
2272 tmp.line = mos7840_port->port->serial->minor;
2273 tmp.port = mos7840_port->port->number;
2274 tmp.irq = 0;
2275 tmp.flags = ASYNC_SKIP_TEST | ASYNC_AUTO_IRQ;
2276 tmp.xmit_fifo_size = NUM_URBS * URB_TRANSFER_BUFFER_SIZE;
2277 tmp.baud_base = 9600;
2278 tmp.close_delay = 5 * HZ;
2279 tmp.closing_wait = 30 * HZ;
2280
2281 if (copy_to_user(retinfo, &tmp, sizeof(*retinfo)))
2282 return -EFAULT;
2283 return 0;
2284 }
2285
2286 /*****************************************************************************
2287 * SerialIoctl
2288 * this function handles any ioctl calls to the driver
2289 *****************************************************************************/
2290
2291 static int mos7840_ioctl(struct tty_struct *tty, struct file *file,
2292 unsigned int cmd, unsigned long arg)
2293 {
2294 struct usb_serial_port *port = tty->driver_data;
2295 void __user *argp = (void __user *)arg;
2296 struct moschip_port *mos7840_port;
2297
2298 struct async_icount cnow;
2299 struct async_icount cprev;
2300 struct serial_icounter_struct icount;
2301 int mosret = 0;
2302
2303 if (mos7840_port_paranoia_check(port, __func__)) {
2304 dbg("%s", "Invalid port \n");
2305 return -1;
2306 }
2307
2308 mos7840_port = mos7840_get_port_private(port);
2309
2310 if (mos7840_port == NULL)
2311 return -1;
2312
2313 dbg("%s - port %d, cmd = 0x%x", __func__, port->number, cmd);
2314
2315 switch (cmd) {
2316 /* return number of bytes available */
2317
2318 case TIOCSERGETLSR:
2319 dbg("%s (%d) TIOCSERGETLSR", __func__, port->number);
2320 return mos7840_get_lsr_info(tty, argp);
2321 return 0;
2322
2323 /* FIXME: use the modem hooks and remove this */
2324 case TIOCMBIS:
2325 case TIOCMBIC:
2326 case TIOCMSET:
2327 dbg("%s (%d) TIOCMSET/TIOCMBIC/TIOCMSET", __func__,
2328 port->number);
2329 mosret =
2330 mos7840_set_modem_info(mos7840_port, cmd, argp);
2331 return mosret;
2332
2333 case TIOCMGET:
2334 dbg("%s (%d) TIOCMGET", __func__, port->number);
2335 return mos7840_get_modem_info(mos7840_port, argp);
2336
2337 case TIOCGSERIAL:
2338 dbg("%s (%d) TIOCGSERIAL", __func__, port->number);
2339 return mos7840_get_serial_info(mos7840_port, argp);
2340
2341 case TIOCSSERIAL:
2342 dbg("%s (%d) TIOCSSERIAL", __func__, port->number);
2343 break;
2344
2345 case TIOCMIWAIT:
2346 dbg("%s (%d) TIOCMIWAIT", __func__, port->number);
2347 cprev = mos7840_port->icount;
2348 while (1) {
2349 /* interruptible_sleep_on(&mos7840_port->delta_msr_wait); */
2350 mos7840_port->delta_msr_cond = 0;
2351 wait_event_interruptible(mos7840_port->delta_msr_wait,
2352 (mos7840_port->
2353 delta_msr_cond == 1));
2354
2355 /* see if a signal did it */
2356 if (signal_pending(current))
2357 return -ERESTARTSYS;
2358 cnow = mos7840_port->icount;
2359 smp_rmb();
2360 if (cnow.rng == cprev.rng && cnow.dsr == cprev.dsr &&
2361 cnow.dcd == cprev.dcd && cnow.cts == cprev.cts)
2362 return -EIO; /* no change => error */
2363 if (((arg & TIOCM_RNG) && (cnow.rng != cprev.rng)) ||
2364 ((arg & TIOCM_DSR) && (cnow.dsr != cprev.dsr)) ||
2365 ((arg & TIOCM_CD) && (cnow.dcd != cprev.dcd)) ||
2366 ((arg & TIOCM_CTS) && (cnow.cts != cprev.cts))) {
2367 return 0;
2368 }
2369 cprev = cnow;
2370 }
2371 /* NOTREACHED */
2372 break;
2373
2374 case TIOCGICOUNT:
2375 cnow = mos7840_port->icount;
2376 smp_rmb();
2377 icount.cts = cnow.cts;
2378 icount.dsr = cnow.dsr;
2379 icount.rng = cnow.rng;
2380 icount.dcd = cnow.dcd;
2381 icount.rx = cnow.rx;
2382 icount.tx = cnow.tx;
2383 icount.frame = cnow.frame;
2384 icount.overrun = cnow.overrun;
2385 icount.parity = cnow.parity;
2386 icount.brk = cnow.brk;
2387 icount.buf_overrun = cnow.buf_overrun;
2388
2389 dbg("%s (%d) TIOCGICOUNT RX=%d, TX=%d", __func__,
2390 port->number, icount.rx, icount.tx);
2391 if (copy_to_user(argp, &icount, sizeof(icount)))
2392 return -EFAULT;
2393 return 0;
2394 default:
2395 break;
2396 }
2397 return -ENOIOCTLCMD;
2398 }
2399
2400 static int mos7840_calc_num_ports(struct usb_serial *serial)
2401 {
2402 int mos7840_num_ports = 0;
2403
2404 dbg("numberofendpoints: %d \n",
2405 (int)serial->interface->cur_altsetting->desc.bNumEndpoints);
2406 dbg("numberofendpoints: %d \n",
2407 (int)serial->interface->altsetting->desc.bNumEndpoints);
2408 if (serial->interface->cur_altsetting->desc.bNumEndpoints == 5) {
2409 mos7840_num_ports = serial->num_ports = 2;
2410 } else if (serial->interface->cur_altsetting->desc.bNumEndpoints == 9) {
2411 serial->num_bulk_in = 4;
2412 serial->num_bulk_out = 4;
2413 mos7840_num_ports = serial->num_ports = 4;
2414 }
2415
2416 return mos7840_num_ports;
2417 }
2418
2419 /****************************************************************************
2420 * mos7840_startup
2421 ****************************************************************************/
2422
2423 static int mos7840_startup(struct usb_serial *serial)
2424 {
2425 struct moschip_port *mos7840_port;
2426 struct usb_device *dev;
2427 int i, status;
2428
2429 __u16 Data;
2430 dbg("%s \n", " mos7840_startup :entering..........");
2431
2432 if (!serial) {
2433 dbg("%s\n", "Invalid Handler");
2434 return -1;
2435 }
2436
2437 dev = serial->dev;
2438
2439 dbg("%s\n", "Entering...");
2440
2441 /* we set up the pointers to the endpoints in the mos7840_open *
2442 * function, as the structures aren't created yet. */
2443
2444 /* set up port private structures */
2445 for (i = 0; i < serial->num_ports; ++i) {
2446 mos7840_port = kzalloc(sizeof(struct moschip_port), GFP_KERNEL);
2447 if (mos7840_port == NULL) {
2448 err("%s - Out of memory", __func__);
2449 status = -ENOMEM;
2450 i--; /* don't follow NULL pointer cleaning up */
2451 goto error;
2452 }
2453
2454 /* Initialize all port interrupt end point to port 0 int
2455 * endpoint. Our device has only one interrupt end point
2456 * common to all port */
2457
2458 mos7840_port->port = serial->port[i];
2459 mos7840_set_port_private(serial->port[i], mos7840_port);
2460 spin_lock_init(&mos7840_port->pool_lock);
2461
2462 mos7840_port->port_num = ((serial->port[i]->number -
2463 (serial->port[i]->serial->minor)) +
2464 1);
2465
2466 if (mos7840_port->port_num == 1) {
2467 mos7840_port->SpRegOffset = 0x0;
2468 mos7840_port->ControlRegOffset = 0x1;
2469 mos7840_port->DcrRegOffset = 0x4;
2470 } else if ((mos7840_port->port_num == 2)
2471 && (serial->num_ports == 4)) {
2472 mos7840_port->SpRegOffset = 0x8;
2473 mos7840_port->ControlRegOffset = 0x9;
2474 mos7840_port->DcrRegOffset = 0x16;
2475 } else if ((mos7840_port->port_num == 2)
2476 && (serial->num_ports == 2)) {
2477 mos7840_port->SpRegOffset = 0xa;
2478 mos7840_port->ControlRegOffset = 0xb;
2479 mos7840_port->DcrRegOffset = 0x19;
2480 } else if ((mos7840_port->port_num == 3)
2481 && (serial->num_ports == 4)) {
2482 mos7840_port->SpRegOffset = 0xa;
2483 mos7840_port->ControlRegOffset = 0xb;
2484 mos7840_port->DcrRegOffset = 0x19;
2485 } else if ((mos7840_port->port_num == 4)
2486 && (serial->num_ports == 4)) {
2487 mos7840_port->SpRegOffset = 0xc;
2488 mos7840_port->ControlRegOffset = 0xd;
2489 mos7840_port->DcrRegOffset = 0x1c;
2490 }
2491 mos7840_dump_serial_port(mos7840_port);
2492 mos7840_set_port_private(serial->port[i], mos7840_port);
2493
2494 /* enable rx_disable bit in control register */
2495 status = mos7840_get_reg_sync(serial->port[i],
2496 mos7840_port->ControlRegOffset, &Data);
2497 if (status < 0) {
2498 dbg("Reading ControlReg failed status-0x%x\n", status);
2499 break;
2500 } else
2501 dbg("ControlReg Reading success val is %x, status%d\n",
2502 Data, status);
2503 Data |= 0x08; /* setting driver done bit */
2504 Data |= 0x04; /* sp1_bit to have cts change reflect in
2505 modem status reg */
2506
2507 /* Data |= 0x20; //rx_disable bit */
2508 status = mos7840_set_reg_sync(serial->port[i],
2509 mos7840_port->ControlRegOffset, Data);
2510 if (status < 0) {
2511 dbg("Writing ControlReg failed(rx_disable) status-0x%x\n", status);
2512 break;
2513 } else
2514 dbg("ControlReg Writing success(rx_disable) status%d\n",
2515 status);
2516
2517 /* Write default values in DCR (i.e 0x01 in DCR0, 0x05 in DCR2
2518 and 0x24 in DCR3 */
2519 Data = 0x01;
2520 status = mos7840_set_reg_sync(serial->port[i],
2521 (__u16) (mos7840_port->DcrRegOffset + 0), Data);
2522 if (status < 0) {
2523 dbg("Writing DCR0 failed status-0x%x\n", status);
2524 break;
2525 } else
2526 dbg("DCR0 Writing success status%d\n", status);
2527
2528 Data = 0x05;
2529 status = mos7840_set_reg_sync(serial->port[i],
2530 (__u16) (mos7840_port->DcrRegOffset + 1), Data);
2531 if (status < 0) {
2532 dbg("Writing DCR1 failed status-0x%x\n", status);
2533 break;
2534 } else
2535 dbg("DCR1 Writing success status%d\n", status);
2536
2537 Data = 0x24;
2538 status = mos7840_set_reg_sync(serial->port[i],
2539 (__u16) (mos7840_port->DcrRegOffset + 2), Data);
2540 if (status < 0) {
2541 dbg("Writing DCR2 failed status-0x%x\n", status);
2542 break;
2543 } else
2544 dbg("DCR2 Writing success status%d\n", status);
2545
2546 /* write values in clkstart0x0 and clkmulti 0x20 */
2547 Data = 0x0;
2548 status = mos7840_set_reg_sync(serial->port[i],
2549 CLK_START_VALUE_REGISTER, Data);
2550 if (status < 0) {
2551 dbg("Writing CLK_START_VALUE_REGISTER failed status-0x%x\n", status);
2552 break;
2553 } else
2554 dbg("CLK_START_VALUE_REGISTER Writing success status%d\n", status);
2555
2556 Data = 0x20;
2557 status = mos7840_set_reg_sync(serial->port[i],
2558 CLK_MULTI_REGISTER, Data);
2559 if (status < 0) {
2560 dbg("Writing CLK_MULTI_REGISTER failed status-0x%x\n",
2561 status);
2562 goto error;
2563 } else
2564 dbg("CLK_MULTI_REGISTER Writing success status%d\n",
2565 status);
2566
2567 /* write value 0x0 to scratchpad register */
2568 Data = 0x00;
2569 status = mos7840_set_uart_reg(serial->port[i],
2570 SCRATCH_PAD_REGISTER, Data);
2571 if (status < 0) {
2572 dbg("Writing SCRATCH_PAD_REGISTER failed status-0x%x\n",
2573 status);
2574 break;
2575 } else
2576 dbg("SCRATCH_PAD_REGISTER Writing success status%d\n",
2577 status);
2578
2579 /* Zero Length flag register */
2580 if ((mos7840_port->port_num != 1)
2581 && (serial->num_ports == 2)) {
2582
2583 Data = 0xff;
2584 status = mos7840_set_reg_sync(serial->port[i],
2585 (__u16) (ZLP_REG1 +
2586 ((__u16)mos7840_port->port_num)), Data);
2587 dbg("ZLIP offset%x\n",
2588 (__u16) (ZLP_REG1 +
2589 ((__u16) mos7840_port->port_num)));
2590 if (status < 0) {
2591 dbg("Writing ZLP_REG%d failed status-0x%x\n",
2592 i + 2, status);
2593 break;
2594 } else
2595 dbg("ZLP_REG%d Writing success status%d\n",
2596 i + 2, status);
2597 } else {
2598 Data = 0xff;
2599 status = mos7840_set_reg_sync(serial->port[i],
2600 (__u16) (ZLP_REG1 +
2601 ((__u16)mos7840_port->port_num) - 0x1), Data);
2602 dbg("ZLIP offset%x\n",
2603 (__u16) (ZLP_REG1 +
2604 ((__u16) mos7840_port->port_num) - 0x1));
2605 if (status < 0) {
2606 dbg("Writing ZLP_REG%d failed status-0x%x\n",
2607 i + 1, status);
2608 break;
2609 } else
2610 dbg("ZLP_REG%d Writing success status%d\n",
2611 i + 1, status);
2612
2613 }
2614 mos7840_port->control_urb = usb_alloc_urb(0, GFP_KERNEL);
2615 mos7840_port->ctrl_buf = kmalloc(16, GFP_KERNEL);
2616 mos7840_port->dr = kmalloc(sizeof(struct usb_ctrlrequest),
2617 GFP_KERNEL);
2618 if (!mos7840_port->control_urb || !mos7840_port->ctrl_buf ||
2619 !mos7840_port->dr) {
2620 status = -ENOMEM;
2621 goto error;
2622 }
2623 }
2624
2625 /* Zero Length flag enable */
2626 Data = 0x0f;
2627 status = mos7840_set_reg_sync(serial->port[0], ZLP_REG5, Data);
2628 if (status < 0) {
2629 dbg("Writing ZLP_REG5 failed status-0x%x\n", status);
2630 goto error;
2631 } else
2632 dbg("ZLP_REG5 Writing success status%d\n", status);
2633
2634 /* setting configuration feature to one */
2635 usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0),
2636 (__u8) 0x03, 0x00, 0x01, 0x00, NULL, 0x00, 5 * HZ);
2637 return 0;
2638 error:
2639 for (/* nothing */; i >= 0; i--) {
2640 mos7840_port = mos7840_get_port_private(serial->port[i]);
2641
2642 kfree(mos7840_port->dr);
2643 kfree(mos7840_port->ctrl_buf);
2644 usb_free_urb(mos7840_port->control_urb);
2645 kfree(mos7840_port);
2646 serial->port[i] = NULL;
2647 }
2648 return status;
2649 }
2650
2651 /****************************************************************************
2652 * mos7840_shutdown
2653 * This function is called whenever the device is removed from the usb bus.
2654 ****************************************************************************/
2655
2656 static void mos7840_shutdown(struct usb_serial *serial)
2657 {
2658 int i;
2659 unsigned long flags;
2660 struct moschip_port *mos7840_port;
2661 dbg("%s \n", " shutdown :entering..........");
2662
2663 if (!serial) {
2664 dbg("%s", "Invalid Handler \n");
2665 return;
2666 }
2667
2668 /* check for the ports to be closed,close the ports and disconnect */
2669
2670 /* free private structure allocated for serial port *
2671 * stop reads and writes on all ports */
2672
2673 for (i = 0; i < serial->num_ports; ++i) {
2674 mos7840_port = mos7840_get_port_private(serial->port[i]);
2675 spin_lock_irqsave(&mos7840_port->pool_lock, flags);
2676 mos7840_port->zombie = 1;
2677 spin_unlock_irqrestore(&mos7840_port->pool_lock, flags);
2678 usb_kill_urb(mos7840_port->control_urb);
2679 kfree(mos7840_port->ctrl_buf);
2680 kfree(mos7840_port->dr);
2681 kfree(mos7840_port);
2682 mos7840_set_port_private(serial->port[i], NULL);
2683 }
2684
2685 dbg("%s\n", "Thank u :: ");
2686
2687 }
2688
2689 static struct usb_driver io_driver = {
2690 .name = "mos7840",
2691 .probe = usb_serial_probe,
2692 .disconnect = usb_serial_disconnect,
2693 .id_table = moschip_id_table_combined,
2694 .no_dynamic_id = 1,
2695 };
2696
2697 static struct usb_serial_driver moschip7840_4port_device = {
2698 .driver = {
2699 .owner = THIS_MODULE,
2700 .name = "mos7840",
2701 },
2702 .description = DRIVER_DESC,
2703 .usb_driver = &io_driver,
2704 .id_table = moschip_port_id_table,
2705 .num_ports = 4,
2706 .open = mos7840_open,
2707 .close = mos7840_close,
2708 .write = mos7840_write,
2709 .write_room = mos7840_write_room,
2710 .chars_in_buffer = mos7840_chars_in_buffer,
2711 .throttle = mos7840_throttle,
2712 .unthrottle = mos7840_unthrottle,
2713 .calc_num_ports = mos7840_calc_num_ports,
2714 #ifdef MCSSerialProbe
2715 .probe = mos7840_serial_probe,
2716 #endif
2717 .ioctl = mos7840_ioctl,
2718 .set_termios = mos7840_set_termios,
2719 .break_ctl = mos7840_break,
2720 .tiocmget = mos7840_tiocmget,
2721 .tiocmset = mos7840_tiocmset,
2722 .attach = mos7840_startup,
2723 .shutdown = mos7840_shutdown,
2724 .read_bulk_callback = mos7840_bulk_in_callback,
2725 .read_int_callback = mos7840_interrupt_callback,
2726 };
2727
2728 /****************************************************************************
2729 * moschip7840_init
2730 * This is called by the module subsystem, or on startup to initialize us
2731 ****************************************************************************/
2732 static int __init moschip7840_init(void)
2733 {
2734 int retval;
2735
2736 dbg("%s \n", " mos7840_init :entering..........");
2737
2738 /* Register with the usb serial */
2739 retval = usb_serial_register(&moschip7840_4port_device);
2740
2741 if (retval)
2742 goto failed_port_device_register;
2743
2744 dbg("%s\n", "Entring...");
2745 info(DRIVER_DESC " " DRIVER_VERSION);
2746
2747 /* Register with the usb */
2748 retval = usb_register(&io_driver);
2749 if (retval == 0) {
2750 dbg("%s\n", "Leaving...");
2751 return 0;
2752 }
2753 usb_serial_deregister(&moschip7840_4port_device);
2754 failed_port_device_register:
2755 return retval;
2756 }
2757
2758 /****************************************************************************
2759 * moschip7840_exit
2760 * Called when the driver is about to be unloaded.
2761 ****************************************************************************/
2762 static void __exit moschip7840_exit(void)
2763 {
2764
2765 dbg("%s \n", " mos7840_exit :entering..........");
2766
2767 usb_deregister(&io_driver);
2768
2769 usb_serial_deregister(&moschip7840_4port_device);
2770
2771 dbg("%s\n", "Entring...");
2772 }
2773
2774 module_init(moschip7840_init);
2775 module_exit(moschip7840_exit);
2776
2777 /* Module information */
2778 MODULE_DESCRIPTION(DRIVER_DESC);
2779 MODULE_LICENSE("GPL");
2780
2781 module_param(debug, bool, S_IRUGO | S_IWUSR);
2782 MODULE_PARM_DESC(debug, "Debug enabled or not");
Linux kernel - Deliverables
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