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x86: mce: Move code in mce.c
[linux-2.6/linux-2.6-openrd.git] / drivers / usb / serial / mos7840.c
blob10b78a37214f6c337b1ac1bb3cb93219a9bbd3ba
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 /* Check to see if we've set up our endpoint info yet *
1011 * (can't set it up in mos7840_startup as the structures *
1012 * were not set up at that time.) */
1013 if (port0->open_ports == 1) {
1014 if (serial->port[0]->interrupt_in_buffer == NULL) {
1015 /* set up interrupt urb */
1016 usb_fill_int_urb(serial->port[0]->interrupt_in_urb,
1017 serial->dev,
1018 usb_rcvintpipe(serial->dev,
1019 serial->port[0]->interrupt_in_endpointAddress),
1020 serial->port[0]->interrupt_in_buffer,
1021 serial->port[0]->interrupt_in_urb->
1022 transfer_buffer_length,
1023 mos7840_interrupt_callback,
1024 serial,
1025 serial->port[0]->interrupt_in_urb->interval);
1026
1027 /* start interrupt read for mos7840 *
1028 * will continue as long as mos7840 is connected */
1029
1030 response =
1031 usb_submit_urb(serial->port[0]->interrupt_in_urb,
1032 GFP_KERNEL);
1033 if (response) {
1034 dev_err(&port->dev, "%s - Error %d submitting "
1035 "interrupt urb\n", __func__, response);
1036 }
1037
1038 }
1039
1040 }
1041
1042 /* see if we've set up our endpoint info yet *
1043 * (can't set it up in mos7840_startup as the *
1044 * structures were not set up at that time.) */
1045
1046 dbg("port number is %d \n", port->number);
1047 dbg("serial number is %d \n", port->serial->minor);
1048 dbg("Bulkin endpoint is %d \n", port->bulk_in_endpointAddress);
1049 dbg("BulkOut endpoint is %d \n", port->bulk_out_endpointAddress);
1050 dbg("Interrupt endpoint is %d \n", port->interrupt_in_endpointAddress);
1051 dbg("port's number in the device is %d\n", mos7840_port->port_num);
1052 mos7840_port->read_urb = port->read_urb;
1053
1054 /* set up our bulk in urb */
1055
1056 usb_fill_bulk_urb(mos7840_port->read_urb,
1057 serial->dev,
1058 usb_rcvbulkpipe(serial->dev,
1059 port->bulk_in_endpointAddress),
1060 port->bulk_in_buffer,
1061 mos7840_port->read_urb->transfer_buffer_length,
1062 mos7840_bulk_in_callback, mos7840_port);
1063
1064 dbg("mos7840_open: bulkin endpoint is %d\n",
1065 port->bulk_in_endpointAddress);
1066 mos7840_port->read_urb_busy = true;
1067 response = usb_submit_urb(mos7840_port->read_urb, GFP_KERNEL);
1068 if (response) {
1069 dev_err(&port->dev, "%s - Error %d submitting control urb\n",
1070 __func__, response);
1071 mos7840_port->read_urb_busy = false;
1072 }
1073
1074 /* initialize our wait queues */
1075 init_waitqueue_head(&mos7840_port->wait_chase);
1076 init_waitqueue_head(&mos7840_port->delta_msr_wait);
1077
1078 /* initialize our icount structure */
1079 memset(&(mos7840_port->icount), 0x00, sizeof(mos7840_port->icount));
1080
1081 /* initialize our port settings */
1082 /* Must set to enable ints! */
1083 mos7840_port->shadowMCR = MCR_MASTER_IE;
1084 /* send a open port command */
1085 mos7840_port->open = 1;
1086 /* mos7840_change_port_settings(mos7840_port,old_termios); */
1087 mos7840_port->icount.tx = 0;
1088 mos7840_port->icount.rx = 0;
1089
1090 dbg("\n\nusb_serial serial:%p mos7840_port:%p\n usb_serial_port port:%p\n\n",
1091 serial, mos7840_port, port);
1092
1093 return 0;
1094
1095 }
1096
1097 /*****************************************************************************
1098 * mos7840_chars_in_buffer
1099 * this function is called by the tty driver when it wants to know how many
1100 * bytes of data we currently have outstanding in the port (data that has
1101 * been written, but hasn't made it out the port yet)
1102 * If successful, we return the number of bytes left to be written in the
1103 * system,
1104 * Otherwise we return zero.
1105 *****************************************************************************/
1106
1107 static int mos7840_chars_in_buffer(struct tty_struct *tty)
1108 {
1109 struct usb_serial_port *port = tty->driver_data;
1110 int i;
1111 int chars = 0;
1112 unsigned long flags;
1113 struct moschip_port *mos7840_port;
1114
1115 dbg("%s \n", " mos7840_chars_in_buffer:entering ...........");
1116
1117 if (mos7840_port_paranoia_check(port, __func__)) {
1118 dbg("%s", "Invalid port \n");
1119 return 0;
1120 }
1121
1122 mos7840_port = mos7840_get_port_private(port);
1123 if (mos7840_port == NULL) {
1124 dbg("%s \n", "mos7840_break:leaving ...........");
1125 return 0;
1126 }
1127
1128 spin_lock_irqsave(&mos7840_port->pool_lock, flags);
1129 for (i = 0; i < NUM_URBS; ++i)
1130 if (mos7840_port->busy[i])
1131 chars += URB_TRANSFER_BUFFER_SIZE;
1132 spin_unlock_irqrestore(&mos7840_port->pool_lock, flags);
1133 dbg("%s - returns %d", __func__, chars);
1134 return chars;
1135
1136 }
1137
1138 /*****************************************************************************
1139 * mos7840_close
1140 * this function is called by the tty driver when a port is closed
1141 *****************************************************************************/
1142
1143 static void mos7840_close(struct usb_serial_port *port)
1144 {
1145 struct usb_serial *serial;
1146 struct moschip_port *mos7840_port;
1147 struct moschip_port *port0;
1148 int j;
1149 __u16 Data;
1150
1151 dbg("%s\n", "mos7840_close:entering...");
1152
1153 if (mos7840_port_paranoia_check(port, __func__)) {
1154 dbg("%s", "Port Paranoia failed \n");
1155 return;
1156 }
1157
1158 serial = mos7840_get_usb_serial(port, __func__);
1159 if (!serial) {
1160 dbg("%s", "Serial Paranoia failed \n");
1161 return;
1162 }
1163
1164 mos7840_port = mos7840_get_port_private(port);
1165 port0 = mos7840_get_port_private(serial->port[0]);
1166
1167 if (mos7840_port == NULL || port0 == NULL)
1168 return;
1169
1170 for (j = 0; j < NUM_URBS; ++j)
1171 usb_kill_urb(mos7840_port->write_urb_pool[j]);
1172
1173 /* Freeing Write URBs */
1174 for (j = 0; j < NUM_URBS; ++j) {
1175 if (mos7840_port->write_urb_pool[j]) {
1176 if (mos7840_port->write_urb_pool[j]->transfer_buffer)
1177 kfree(mos7840_port->write_urb_pool[j]->
1178 transfer_buffer);
1179
1180 usb_free_urb(mos7840_port->write_urb_pool[j]);
1181 }
1182 }
1183
1184 /* While closing port, shutdown all bulk read, write *
1185 * and interrupt read if they exists */
1186 if (serial->dev) {
1187 if (mos7840_port->write_urb) {
1188 dbg("%s", "Shutdown bulk write\n");
1189 usb_kill_urb(mos7840_port->write_urb);
1190 }
1191 if (mos7840_port->read_urb) {
1192 dbg("%s", "Shutdown bulk read\n");
1193 usb_kill_urb(mos7840_port->read_urb);
1194 mos7840_port->read_urb_busy = false;
1195 }
1196 if ((&mos7840_port->control_urb)) {
1197 dbg("%s", "Shutdown control read\n");
1198 /*/ usb_kill_urb (mos7840_port->control_urb); */
1199 }
1200 }
1201 /* if(mos7840_port->ctrl_buf != NULL) */
1202 /* kfree(mos7840_port->ctrl_buf); */
1203 port0->open_ports--;
1204 dbg("mos7840_num_open_ports in close%d:in port%d\n",
1205 port0->open_ports, port->number);
1206 if (port0->open_ports == 0) {
1207 if (serial->port[0]->interrupt_in_urb) {
1208 dbg("%s", "Shutdown interrupt_in_urb\n");
1209 usb_kill_urb(serial->port[0]->interrupt_in_urb);
1210 }
1211 }
1212
1213 if (mos7840_port->write_urb) {
1214 /* if this urb had a transfer buffer already (old tx) free it */
1215 if (mos7840_port->write_urb->transfer_buffer != NULL)
1216 kfree(mos7840_port->write_urb->transfer_buffer);
1217 usb_free_urb(mos7840_port->write_urb);
1218 }
1219
1220 Data = 0x0;
1221 mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER, Data);
1222
1223 Data = 0x00;
1224 mos7840_set_uart_reg(port, INTERRUPT_ENABLE_REGISTER, Data);
1225
1226 mos7840_port->open = 0;
1227
1228 dbg("%s \n", "Leaving ............");
1229 }
1230
1231 /************************************************************************
1232 *
1233 * mos7840_block_until_chase_response
1234 *
1235 * This function will block the close until one of the following:
1236 * 1. Response to our Chase comes from mos7840
1237 * 2. A timeout of 10 seconds without activity has expired
1238 * (1K of mos7840 data @ 2400 baud ==> 4 sec to empty)
1239 *
1240 ************************************************************************/
1241
1242 static void mos7840_block_until_chase_response(struct tty_struct *tty,
1243 struct moschip_port *mos7840_port)
1244 {
1245 int timeout = 1 * HZ;
1246 int wait = 10;
1247 int count;
1248
1249 while (1) {
1250 count = mos7840_chars_in_buffer(tty);
1251
1252 /* Check for Buffer status */
1253 if (count <= 0)
1254 return;
1255
1256 /* Block the thread for a while */
1257 interruptible_sleep_on_timeout(&mos7840_port->wait_chase,
1258 timeout);
1259 /* No activity.. count down section */
1260 wait--;
1261 if (wait == 0) {
1262 dbg("%s - TIMEOUT", __func__);
1263 return;
1264 } else {
1265 /* Reset timeout value back to seconds */
1266 wait = 10;
1267 }
1268 }
1269
1270 }
1271
1272 /*****************************************************************************
1273 * mos7840_break
1274 * this function sends a break to the port
1275 *****************************************************************************/
1276 static void mos7840_break(struct tty_struct *tty, int break_state)
1277 {
1278 struct usb_serial_port *port = tty->driver_data;
1279 unsigned char data;
1280 struct usb_serial *serial;
1281 struct moschip_port *mos7840_port;
1282
1283 dbg("%s \n", "Entering ...........");
1284 dbg("mos7840_break: Start\n");
1285
1286 if (mos7840_port_paranoia_check(port, __func__)) {
1287 dbg("%s", "Port Paranoia failed \n");
1288 return;
1289 }
1290
1291 serial = mos7840_get_usb_serial(port, __func__);
1292 if (!serial) {
1293 dbg("%s", "Serial Paranoia failed \n");
1294 return;
1295 }
1296
1297 mos7840_port = mos7840_get_port_private(port);
1298
1299 if (mos7840_port == NULL)
1300 return;
1301
1302 if (serial->dev)
1303 /* flush and block until tx is empty */
1304 mos7840_block_until_chase_response(tty, mos7840_port);
1305
1306 if (break_state == -1)
1307 data = mos7840_port->shadowLCR | LCR_SET_BREAK;
1308 else
1309 data = mos7840_port->shadowLCR & ~LCR_SET_BREAK;
1310
1311 /* FIXME: no locking on shadowLCR anywhere in driver */
1312 mos7840_port->shadowLCR = data;
1313 dbg("mcs7840_break mos7840_port->shadowLCR is %x\n",
1314 mos7840_port->shadowLCR);
1315 mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER,
1316 mos7840_port->shadowLCR);
1317
1318 return;
1319 }
1320
1321 /*****************************************************************************
1322 * mos7840_write_room
1323 * this function is called by the tty driver when it wants to know how many
1324 * bytes of data we can accept for a specific port.
1325 * If successful, we return the amount of room that we have for this port
1326 * Otherwise we return a negative error number.
1327 *****************************************************************************/
1328
1329 static int mos7840_write_room(struct tty_struct *tty)
1330 {
1331 struct usb_serial_port *port = tty->driver_data;
1332 int i;
1333 int room = 0;
1334 unsigned long flags;
1335 struct moschip_port *mos7840_port;
1336
1337 dbg("%s \n", " mos7840_write_room:entering ...........");
1338
1339 if (mos7840_port_paranoia_check(port, __func__)) {
1340 dbg("%s", "Invalid port \n");
1341 dbg("%s \n", " mos7840_write_room:leaving ...........");
1342 return -1;
1343 }
1344
1345 mos7840_port = mos7840_get_port_private(port);
1346 if (mos7840_port == NULL) {
1347 dbg("%s \n", "mos7840_break:leaving ...........");
1348 return -1;
1349 }
1350
1351 spin_lock_irqsave(&mos7840_port->pool_lock, flags);
1352 for (i = 0; i < NUM_URBS; ++i) {
1353 if (!mos7840_port->busy[i])
1354 room += URB_TRANSFER_BUFFER_SIZE;
1355 }
1356 spin_unlock_irqrestore(&mos7840_port->pool_lock, flags);
1357
1358 room = (room == 0) ? 0 : room - URB_TRANSFER_BUFFER_SIZE + 1;
1359 dbg("%s - returns %d", __func__, room);
1360 return room;
1361
1362 }
1363
1364 /*****************************************************************************
1365 * mos7840_write
1366 * this function is called by the tty driver when data should be written to
1367 * the port.
1368 * If successful, we return the number of bytes written, otherwise we
1369 * return a negative error number.
1370 *****************************************************************************/
1371
1372 static int mos7840_write(struct tty_struct *tty, struct usb_serial_port *port,
1373 const unsigned char *data, int count)
1374 {
1375 int status;
1376 int i;
1377 int bytes_sent = 0;
1378 int transfer_size;
1379 unsigned long flags;
1380
1381 struct moschip_port *mos7840_port;
1382 struct usb_serial *serial;
1383 struct urb *urb;
1384 /* __u16 Data; */
1385 const unsigned char *current_position = data;
1386 unsigned char *data1;
1387 dbg("%s \n", "entering ...........");
1388 /* dbg("mos7840_write: mos7840_port->shadowLCR is %x\n",
1389 mos7840_port->shadowLCR); */
1390
1391 #ifdef NOTMOS7840
1392 Data = 0x00;
1393 status = mos7840_get_uart_reg(port, LINE_CONTROL_REGISTER, &Data);
1394 mos7840_port->shadowLCR = Data;
1395 dbg("mos7840_write: LINE_CONTROL_REGISTER is %x\n", Data);
1396 dbg("mos7840_write: mos7840_port->shadowLCR is %x\n",
1397 mos7840_port->shadowLCR);
1398
1399 /* Data = 0x03; */
1400 /* status = mos7840_set_uart_reg(port,LINE_CONTROL_REGISTER,Data); */
1401 /* mos7840_port->shadowLCR=Data;//Need to add later */
1402
1403 Data |= SERIAL_LCR_DLAB; /* data latch enable in LCR 0x80 */
1404 status = mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data);
1405
1406 /* Data = 0x0c; */
1407 /* status = mos7840_set_uart_reg(port,DIVISOR_LATCH_LSB,Data); */
1408 Data = 0x00;
1409 status = mos7840_get_uart_reg(port, DIVISOR_LATCH_LSB, &Data);
1410 dbg("mos7840_write:DLL value is %x\n", Data);
1411
1412 Data = 0x0;
1413 status = mos7840_get_uart_reg(port, DIVISOR_LATCH_MSB, &Data);
1414 dbg("mos7840_write:DLM value is %x\n", Data);
1415
1416 Data = Data & ~SERIAL_LCR_DLAB;
1417 dbg("mos7840_write: mos7840_port->shadowLCR is %x\n",
1418 mos7840_port->shadowLCR);
1419 status = mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data);
1420 #endif
1421
1422 if (mos7840_port_paranoia_check(port, __func__)) {
1423 dbg("%s", "Port Paranoia failed \n");
1424 return -1;
1425 }
1426
1427 serial = port->serial;
1428 if (mos7840_serial_paranoia_check(serial, __func__)) {
1429 dbg("%s", "Serial Paranoia failed \n");
1430 return -1;
1431 }
1432
1433 mos7840_port = mos7840_get_port_private(port);
1434 if (mos7840_port == NULL) {
1435 dbg("%s", "mos7840_port is NULL\n");
1436 return -1;
1437 }
1438
1439 /* try to find a free urb in the list */
1440 urb = NULL;
1441
1442 spin_lock_irqsave(&mos7840_port->pool_lock, flags);
1443 for (i = 0; i < NUM_URBS; ++i) {
1444 if (!mos7840_port->busy[i]) {
1445 mos7840_port->busy[i] = 1;
1446 urb = mos7840_port->write_urb_pool[i];
1447 dbg("\nURB:%d", i);
1448 break;
1449 }
1450 }
1451 spin_unlock_irqrestore(&mos7840_port->pool_lock, flags);
1452
1453 if (urb == NULL) {
1454 dbg("%s - no more free urbs", __func__);
1455 goto exit;
1456 }
1457
1458 if (urb->transfer_buffer == NULL) {
1459 urb->transfer_buffer =
1460 kmalloc(URB_TRANSFER_BUFFER_SIZE, GFP_KERNEL);
1461
1462 if (urb->transfer_buffer == NULL) {
1463 dev_err(&port->dev, "%s no more kernel memory...\n",
1464 __func__);
1465 goto exit;
1466 }
1467 }
1468 transfer_size = min(count, URB_TRANSFER_BUFFER_SIZE);
1469
1470 memcpy(urb->transfer_buffer, current_position, transfer_size);
1471
1472 /* fill urb with data and submit */
1473 usb_fill_bulk_urb(urb,
1474 serial->dev,
1475 usb_sndbulkpipe(serial->dev,
1476 port->bulk_out_endpointAddress),
1477 urb->transfer_buffer,
1478 transfer_size,
1479 mos7840_bulk_out_data_callback, mos7840_port);
1480
1481 data1 = urb->transfer_buffer;
1482 dbg("\nbulkout endpoint is %d", port->bulk_out_endpointAddress);
1483
1484 /* send it down the pipe */
1485 status = usb_submit_urb(urb, GFP_ATOMIC);
1486
1487 if (status) {
1488 mos7840_port->busy[i] = 0;
1489 dev_err(&port->dev, "%s - usb_submit_urb(write bulk) failed "
1490 "with status = %d\n", __func__, status);
1491 bytes_sent = status;
1492 goto exit;
1493 }
1494 bytes_sent = transfer_size;
1495 mos7840_port->icount.tx += transfer_size;
1496 smp_wmb();
1497 dbg("mos7840_port->icount.tx is %d:\n", mos7840_port->icount.tx);
1498 exit:
1499 return bytes_sent;
1500
1501 }
1502
1503 /*****************************************************************************
1504 * mos7840_throttle
1505 * this function is called by the tty driver when it wants to stop the data
1506 * being read from the port.
1507 *****************************************************************************/
1508
1509 static void mos7840_throttle(struct tty_struct *tty)
1510 {
1511 struct usb_serial_port *port = tty->driver_data;
1512 struct moschip_port *mos7840_port;
1513 int status;
1514
1515 if (mos7840_port_paranoia_check(port, __func__)) {
1516 dbg("%s", "Invalid port \n");
1517 return;
1518 }
1519
1520 dbg("- port %d\n", port->number);
1521
1522 mos7840_port = mos7840_get_port_private(port);
1523
1524 if (mos7840_port == NULL)
1525 return;
1526
1527 if (!mos7840_port->open) {
1528 dbg("%s\n", "port not opened");
1529 return;
1530 }
1531
1532 dbg("%s", "Entering .......... \n");
1533
1534 /* if we are implementing XON/XOFF, send the stop character */
1535 if (I_IXOFF(tty)) {
1536 unsigned char stop_char = STOP_CHAR(tty);
1537 status = mos7840_write(tty, port, &stop_char, 1);
1538 if (status <= 0)
1539 return;
1540 }
1541 /* if we are implementing RTS/CTS, toggle that line */
1542 if (tty->termios->c_cflag & CRTSCTS) {
1543 mos7840_port->shadowMCR &= ~MCR_RTS;
1544 status = mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER,
1545 mos7840_port->shadowMCR);
1546 if (status < 0)
1547 return;
1548 }
1549
1550 return;
1551 }
1552
1553 /*****************************************************************************
1554 * mos7840_unthrottle
1555 * this function is called by the tty driver when it wants to resume
1556 * the data being read from the port (called after mos7840_throttle is
1557 * called)
1558 *****************************************************************************/
1559 static void mos7840_unthrottle(struct tty_struct *tty)
1560 {
1561 struct usb_serial_port *port = tty->driver_data;
1562 int status;
1563 struct moschip_port *mos7840_port = mos7840_get_port_private(port);
1564
1565 if (mos7840_port_paranoia_check(port, __func__)) {
1566 dbg("%s", "Invalid port \n");
1567 return;
1568 }
1569
1570 if (mos7840_port == NULL)
1571 return;
1572
1573 if (!mos7840_port->open) {
1574 dbg("%s - port not opened", __func__);
1575 return;
1576 }
1577
1578 dbg("%s", "Entering .......... \n");
1579
1580 /* if we are implementing XON/XOFF, send the start character */
1581 if (I_IXOFF(tty)) {
1582 unsigned char start_char = START_CHAR(tty);
1583 status = mos7840_write(tty, port, &start_char, 1);
1584 if (status <= 0)
1585 return;
1586 }
1587
1588 /* if we are implementing RTS/CTS, toggle that line */
1589 if (tty->termios->c_cflag & CRTSCTS) {
1590 mos7840_port->shadowMCR |= MCR_RTS;
1591 status = mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER,
1592 mos7840_port->shadowMCR);
1593 if (status < 0)
1594 return;
1595 }
1596 }
1597
1598 static int mos7840_tiocmget(struct tty_struct *tty, struct file *file)
1599 {
1600 struct usb_serial_port *port = tty->driver_data;
1601 struct moschip_port *mos7840_port;
1602 unsigned int result;
1603 __u16 msr;
1604 __u16 mcr;
1605 int status;
1606 mos7840_port = mos7840_get_port_private(port);
1607
1608 dbg("%s - port %d", __func__, port->number);
1609
1610 if (mos7840_port == NULL)
1611 return -ENODEV;
1612
1613 status = mos7840_get_uart_reg(port, MODEM_STATUS_REGISTER, &msr);
1614 status = mos7840_get_uart_reg(port, MODEM_CONTROL_REGISTER, &mcr);
1615 result = ((mcr & MCR_DTR) ? TIOCM_DTR : 0)
1616 | ((mcr & MCR_RTS) ? TIOCM_RTS : 0)
1617 | ((mcr & MCR_LOOPBACK) ? TIOCM_LOOP : 0)
1618 | ((msr & MOS7840_MSR_CTS) ? TIOCM_CTS : 0)
1619 | ((msr & MOS7840_MSR_CD) ? TIOCM_CAR : 0)
1620 | ((msr & MOS7840_MSR_RI) ? TIOCM_RI : 0)
1621 | ((msr & MOS7840_MSR_DSR) ? TIOCM_DSR : 0);
1622
1623 dbg("%s - 0x%04X", __func__, result);
1624
1625 return result;
1626 }
1627
1628 static int mos7840_tiocmset(struct tty_struct *tty, struct file *file,
1629 unsigned int set, unsigned int clear)
1630 {
1631 struct usb_serial_port *port = tty->driver_data;
1632 struct moschip_port *mos7840_port;
1633 unsigned int mcr;
1634 int status;
1635
1636 dbg("%s - port %d", __func__, port->number);
1637
1638 mos7840_port = mos7840_get_port_private(port);
1639
1640 if (mos7840_port == NULL)
1641 return -ENODEV;
1642
1643 /* FIXME: What locks the port registers ? */
1644 mcr = mos7840_port->shadowMCR;
1645 if (clear & TIOCM_RTS)
1646 mcr &= ~MCR_RTS;
1647 if (clear & TIOCM_DTR)
1648 mcr &= ~MCR_DTR;
1649 if (clear & TIOCM_LOOP)
1650 mcr &= ~MCR_LOOPBACK;
1651
1652 if (set & TIOCM_RTS)
1653 mcr |= MCR_RTS;
1654 if (set & TIOCM_DTR)
1655 mcr |= MCR_DTR;
1656 if (set & TIOCM_LOOP)
1657 mcr |= MCR_LOOPBACK;
1658
1659 mos7840_port->shadowMCR = mcr;
1660
1661 status = mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER, mcr);
1662 if (status < 0) {
1663 dbg("setting MODEM_CONTROL_REGISTER Failed\n");
1664 return status;
1665 }
1666
1667 return 0;
1668 }
1669
1670 /*****************************************************************************
1671 * mos7840_calc_baud_rate_divisor
1672 * this function calculates the proper baud rate divisor for the specified
1673 * baud rate.
1674 *****************************************************************************/
1675 static int mos7840_calc_baud_rate_divisor(int baudRate, int *divisor,
1676 __u16 *clk_sel_val)
1677 {
1678
1679 dbg("%s - %d", __func__, baudRate);
1680
1681 if (baudRate <= 115200) {
1682 *divisor = 115200 / baudRate;
1683 *clk_sel_val = 0x0;
1684 }
1685 if ((baudRate > 115200) && (baudRate <= 230400)) {
1686 *divisor = 230400 / baudRate;
1687 *clk_sel_val = 0x10;
1688 } else if ((baudRate > 230400) && (baudRate <= 403200)) {
1689 *divisor = 403200 / baudRate;
1690 *clk_sel_val = 0x20;
1691 } else if ((baudRate > 403200) && (baudRate <= 460800)) {
1692 *divisor = 460800 / baudRate;
1693 *clk_sel_val = 0x30;
1694 } else if ((baudRate > 460800) && (baudRate <= 806400)) {
1695 *divisor = 806400 / baudRate;
1696 *clk_sel_val = 0x40;
1697 } else if ((baudRate > 806400) && (baudRate <= 921600)) {
1698 *divisor = 921600 / baudRate;
1699 *clk_sel_val = 0x50;
1700 } else if ((baudRate > 921600) && (baudRate <= 1572864)) {
1701 *divisor = 1572864 / baudRate;
1702 *clk_sel_val = 0x60;
1703 } else if ((baudRate > 1572864) && (baudRate <= 3145728)) {
1704 *divisor = 3145728 / baudRate;
1705 *clk_sel_val = 0x70;
1706 }
1707 return 0;
1708
1709 #ifdef NOTMCS7840
1710
1711 for (i = 0; i < ARRAY_SIZE(mos7840_divisor_table); i++) {
1712 if (mos7840_divisor_table[i].BaudRate == baudrate) {
1713 *divisor = mos7840_divisor_table[i].Divisor;
1714 return 0;
1715 }
1716 }
1717
1718 /* After trying for all the standard baud rates *
1719 * Try calculating the divisor for this baud rate */
1720
1721 if (baudrate > 75 && baudrate < 230400) {
1722 /* get the divisor */
1723 custom = (__u16) (230400L / baudrate);
1724
1725 /* Check for round off */
1726 round1 = (__u16) (2304000L / baudrate);
1727 round = (__u16) (round1 - (custom * 10));
1728 if (round > 4)
1729 custom++;
1730 *divisor = custom;
1731
1732 dbg(" Baud %d = %d\n", baudrate, custom);
1733 return 0;
1734 }
1735
1736 dbg("%s\n", " Baud calculation Failed...");
1737 return -1;
1738 #endif
1739 }
1740
1741 /*****************************************************************************
1742 * mos7840_send_cmd_write_baud_rate
1743 * this function sends the proper command to change the baud rate of the
1744 * specified port.
1745 *****************************************************************************/
1746
1747 static int mos7840_send_cmd_write_baud_rate(struct moschip_port *mos7840_port,
1748 int baudRate)
1749 {
1750 int divisor = 0;
1751 int status;
1752 __u16 Data;
1753 unsigned char number;
1754 __u16 clk_sel_val;
1755 struct usb_serial_port *port;
1756
1757 if (mos7840_port == NULL)
1758 return -1;
1759
1760 port = (struct usb_serial_port *)mos7840_port->port;
1761 if (mos7840_port_paranoia_check(port, __func__)) {
1762 dbg("%s", "Invalid port \n");
1763 return -1;
1764 }
1765
1766 if (mos7840_serial_paranoia_check(port->serial, __func__)) {
1767 dbg("%s", "Invalid Serial \n");
1768 return -1;
1769 }
1770
1771 dbg("%s", "Entering .......... \n");
1772
1773 number = mos7840_port->port->number - mos7840_port->port->serial->minor;
1774
1775 dbg("%s - port = %d, baud = %d", __func__,
1776 mos7840_port->port->number, baudRate);
1777 /* reset clk_uart_sel in spregOffset */
1778 if (baudRate > 115200) {
1779 #ifdef HW_flow_control
1780 /* NOTE: need to see the pther register to modify */
1781 /* setting h/w flow control bit to 1 */
1782 Data = 0x2b;
1783 mos7840_port->shadowMCR = Data;
1784 status = mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER,
1785 Data);
1786 if (status < 0) {
1787 dbg("Writing spreg failed in set_serial_baud\n");
1788 return -1;
1789 }
1790 #endif
1791
1792 } else {
1793 #ifdef HW_flow_control
1794 / *setting h/w flow control bit to 0 */
1795 Data = 0xb;
1796 mos7840_port->shadowMCR = Data;
1797 status = mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER,
1798 Data);
1799 if (status < 0) {
1800 dbg("Writing spreg failed in set_serial_baud\n");
1801 return -1;
1802 }
1803 #endif
1804
1805 }
1806
1807 if (1) { /* baudRate <= 115200) */
1808 clk_sel_val = 0x0;
1809 Data = 0x0;
1810 status = mos7840_calc_baud_rate_divisor(baudRate, &divisor,
1811 &clk_sel_val);
1812 status = mos7840_get_reg_sync(port, mos7840_port->SpRegOffset,
1813 &Data);
1814 if (status < 0) {
1815 dbg("reading spreg failed in set_serial_baud\n");
1816 return -1;
1817 }
1818 Data = (Data & 0x8f) | clk_sel_val;
1819 status = mos7840_set_reg_sync(port, mos7840_port->SpRegOffset,
1820 Data);
1821 if (status < 0) {
1822 dbg("Writing spreg failed in set_serial_baud\n");
1823 return -1;
1824 }
1825 /* Calculate the Divisor */
1826
1827 if (status) {
1828 dev_err(&port->dev, "%s - bad baud rate\n", __func__);
1829 return status;
1830 }
1831 /* Enable access to divisor latch */
1832 Data = mos7840_port->shadowLCR | SERIAL_LCR_DLAB;
1833 mos7840_port->shadowLCR = Data;
1834 mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data);
1835
1836 /* Write the divisor */
1837 Data = (unsigned char)(divisor & 0xff);
1838 dbg("set_serial_baud Value to write DLL is %x\n", Data);
1839 mos7840_set_uart_reg(port, DIVISOR_LATCH_LSB, Data);
1840
1841 Data = (unsigned char)((divisor & 0xff00) >> 8);
1842 dbg("set_serial_baud Value to write DLM is %x\n", Data);
1843 mos7840_set_uart_reg(port, DIVISOR_LATCH_MSB, Data);
1844
1845 /* Disable access to divisor latch */
1846 Data = mos7840_port->shadowLCR & ~SERIAL_LCR_DLAB;
1847 mos7840_port->shadowLCR = Data;
1848 mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data);
1849
1850 }
1851 return status;
1852 }
1853
1854 /*****************************************************************************
1855 * mos7840_change_port_settings
1856 * This routine is called to set the UART on the device to match
1857 * the specified new settings.
1858 *****************************************************************************/
1859
1860 static void mos7840_change_port_settings(struct tty_struct *tty,
1861 struct moschip_port *mos7840_port, struct ktermios *old_termios)
1862 {
1863 int baud;
1864 unsigned cflag;
1865 unsigned iflag;
1866 __u8 lData;
1867 __u8 lParity;
1868 __u8 lStop;
1869 int status;
1870 __u16 Data;
1871 struct usb_serial_port *port;
1872 struct usb_serial *serial;
1873
1874 if (mos7840_port == NULL)
1875 return;
1876
1877 port = (struct usb_serial_port *)mos7840_port->port;
1878
1879 if (mos7840_port_paranoia_check(port, __func__)) {
1880 dbg("%s", "Invalid port \n");
1881 return;
1882 }
1883
1884 if (mos7840_serial_paranoia_check(port->serial, __func__)) {
1885 dbg("%s", "Invalid Serial \n");
1886 return;
1887 }
1888
1889 serial = port->serial;
1890
1891 dbg("%s - port %d", __func__, mos7840_port->port->number);
1892
1893 if (!mos7840_port->open) {
1894 dbg("%s - port not opened", __func__);
1895 return;
1896 }
1897
1898 dbg("%s", "Entering .......... \n");
1899
1900 lData = LCR_BITS_8;
1901 lStop = LCR_STOP_1;
1902 lParity = LCR_PAR_NONE;
1903
1904 cflag = tty->termios->c_cflag;
1905 iflag = tty->termios->c_iflag;
1906
1907 /* Change the number of bits */
1908 if (cflag & CSIZE) {
1909 switch (cflag & CSIZE) {
1910 case CS5:
1911 lData = LCR_BITS_5;
1912 break;
1913
1914 case CS6:
1915 lData = LCR_BITS_6;
1916 break;
1917
1918 case CS7:
1919 lData = LCR_BITS_7;
1920 break;
1921 default:
1922 case CS8:
1923 lData = LCR_BITS_8;
1924 break;
1925 }
1926 }
1927 /* Change the Parity bit */
1928 if (cflag & PARENB) {
1929 if (cflag & PARODD) {
1930 lParity = LCR_PAR_ODD;
1931 dbg("%s - parity = odd", __func__);
1932 } else {
1933 lParity = LCR_PAR_EVEN;
1934 dbg("%s - parity = even", __func__);
1935 }
1936
1937 } else {
1938 dbg("%s - parity = none", __func__);
1939 }
1940
1941 if (cflag & CMSPAR)
1942 lParity = lParity | 0x20;
1943
1944 /* Change the Stop bit */
1945 if (cflag & CSTOPB) {
1946 lStop = LCR_STOP_2;
1947 dbg("%s - stop bits = 2", __func__);
1948 } else {
1949 lStop = LCR_STOP_1;
1950 dbg("%s - stop bits = 1", __func__);
1951 }
1952
1953 /* Update the LCR with the correct value */
1954 mos7840_port->shadowLCR &=
1955 ~(LCR_BITS_MASK | LCR_STOP_MASK | LCR_PAR_MASK);
1956 mos7840_port->shadowLCR |= (lData | lParity | lStop);
1957
1958 dbg("mos7840_change_port_settings mos7840_port->shadowLCR is %x\n",
1959 mos7840_port->shadowLCR);
1960 /* Disable Interrupts */
1961 Data = 0x00;
1962 mos7840_set_uart_reg(port, INTERRUPT_ENABLE_REGISTER, Data);
1963
1964 Data = 0x00;
1965 mos7840_set_uart_reg(port, FIFO_CONTROL_REGISTER, Data);
1966
1967 Data = 0xcf;
1968 mos7840_set_uart_reg(port, FIFO_CONTROL_REGISTER, Data);
1969
1970 /* Send the updated LCR value to the mos7840 */
1971 Data = mos7840_port->shadowLCR;
1972
1973 mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data);
1974
1975 Data = 0x00b;
1976 mos7840_port->shadowMCR = Data;
1977 mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER, Data);
1978 Data = 0x00b;
1979 mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER, Data);
1980
1981 /* set up the MCR register and send it to the mos7840 */
1982
1983 mos7840_port->shadowMCR = MCR_MASTER_IE;
1984 if (cflag & CBAUD)
1985 mos7840_port->shadowMCR |= (MCR_DTR | MCR_RTS);
1986
1987 if (cflag & CRTSCTS)
1988 mos7840_port->shadowMCR |= (MCR_XON_ANY);
1989 else
1990 mos7840_port->shadowMCR &= ~(MCR_XON_ANY);
1991
1992 Data = mos7840_port->shadowMCR;
1993 mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER, Data);
1994
1995 /* Determine divisor based on baud rate */
1996 baud = tty_get_baud_rate(tty);
1997
1998 if (!baud) {
1999 /* pick a default, any default... */
2000 dbg("%s\n", "Picked default baud...");
2001 baud = 9600;
2002 }
2003
2004 dbg("%s - baud rate = %d", __func__, baud);
2005 status = mos7840_send_cmd_write_baud_rate(mos7840_port, baud);
2006
2007 /* Enable Interrupts */
2008 Data = 0x0c;
2009 mos7840_set_uart_reg(port, INTERRUPT_ENABLE_REGISTER, Data);
2010
2011 if (mos7840_port->read_urb_busy == false) {
2012 mos7840_port->read_urb->dev = serial->dev;
2013 mos7840_port->read_urb_busy = true;
2014 status = usb_submit_urb(mos7840_port->read_urb, GFP_ATOMIC);
2015 if (status) {
2016 dbg("usb_submit_urb(read bulk) failed, status = %d",
2017 status);
2018 mos7840_port->read_urb_busy = false;
2019 }
2020 }
2021 wake_up(&mos7840_port->delta_msr_wait);
2022 mos7840_port->delta_msr_cond = 1;
2023 dbg("mos7840_change_port_settings mos7840_port->shadowLCR is End %x\n",
2024 mos7840_port->shadowLCR);
2025
2026 return;
2027 }
2028
2029 /*****************************************************************************
2030 * mos7840_set_termios
2031 * this function is called by the tty driver when it wants to change
2032 * the termios structure
2033 *****************************************************************************/
2034
2035 static void mos7840_set_termios(struct tty_struct *tty,
2036 struct usb_serial_port *port,
2037 struct ktermios *old_termios)
2038 {
2039 int status;
2040 unsigned int cflag;
2041 struct usb_serial *serial;
2042 struct moschip_port *mos7840_port;
2043 dbg("mos7840_set_termios: START\n");
2044 if (mos7840_port_paranoia_check(port, __func__)) {
2045 dbg("%s", "Invalid port \n");
2046 return;
2047 }
2048
2049 serial = port->serial;
2050
2051 if (mos7840_serial_paranoia_check(serial, __func__)) {
2052 dbg("%s", "Invalid Serial \n");
2053 return;
2054 }
2055
2056 mos7840_port = mos7840_get_port_private(port);
2057
2058 if (mos7840_port == NULL)
2059 return;
2060
2061 if (!mos7840_port->open) {
2062 dbg("%s - port not opened", __func__);
2063 return;
2064 }
2065
2066 dbg("%s\n", "setting termios - ");
2067
2068 cflag = tty->termios->c_cflag;
2069
2070 dbg("%s - clfag %08x iflag %08x", __func__,
2071 tty->termios->c_cflag, RELEVANT_IFLAG(tty->termios->c_iflag));
2072 dbg("%s - old clfag %08x old iflag %08x", __func__,
2073 old_termios->c_cflag, RELEVANT_IFLAG(old_termios->c_iflag));
2074 dbg("%s - port %d", __func__, port->number);
2075
2076 /* change the port settings to the new ones specified */
2077
2078 mos7840_change_port_settings(tty, mos7840_port, old_termios);
2079
2080 if (!mos7840_port->read_urb) {
2081 dbg("%s", "URB KILLED !!!!!\n");
2082 return;
2083 }
2084
2085 if (mos7840_port->read_urb_busy == false) {
2086 mos7840_port->read_urb->dev = serial->dev;
2087 mos7840_port->read_urb_busy = true;
2088 status = usb_submit_urb(mos7840_port->read_urb, GFP_ATOMIC);
2089 if (status) {
2090 dbg("usb_submit_urb(read bulk) failed, status = %d",
2091 status);
2092 mos7840_port->read_urb_busy = false;
2093 }
2094 }
2095 return;
2096 }
2097
2098 /*****************************************************************************
2099 * mos7840_get_lsr_info - get line status register info
2100 *
2101 * Purpose: Let user call ioctl() to get info when the UART physically
2102 * is emptied. On bus types like RS485, the transmitter must
2103 * release the bus after transmitting. This must be done when
2104 * the transmit shift register is empty, not be done when the
2105 * transmit holding register is empty. This functionality
2106 * allows an RS485 driver to be written in user space.
2107 *****************************************************************************/
2108
2109 static int mos7840_get_lsr_info(struct tty_struct *tty,
2110 unsigned int __user *value)
2111 {
2112 int count;
2113 unsigned int result = 0;
2114
2115 count = mos7840_chars_in_buffer(tty);
2116 if (count == 0) {
2117 dbg("%s -- Empty", __func__);
2118 result = TIOCSER_TEMT;
2119 }
2120
2121 if (copy_to_user(value, &result, sizeof(int)))
2122 return -EFAULT;
2123 return 0;
2124 }
2125
2126 /*****************************************************************************
2127 * mos7840_set_modem_info
2128 * function to set modem info
2129 *****************************************************************************/
2130
2131 /* FIXME: Should be using the model control hooks */
2132
2133 static int mos7840_set_modem_info(struct moschip_port *mos7840_port,
2134 unsigned int cmd, unsigned int __user *value)
2135 {
2136 unsigned int mcr;
2137 unsigned int arg;
2138 __u16 Data;
2139 int status;
2140 struct usb_serial_port *port;
2141
2142 if (mos7840_port == NULL)
2143 return -1;
2144
2145 port = (struct usb_serial_port *)mos7840_port->port;
2146 if (mos7840_port_paranoia_check(port, __func__)) {
2147 dbg("%s", "Invalid port \n");
2148 return -1;
2149 }
2150
2151 mcr = mos7840_port->shadowMCR;
2152
2153 if (copy_from_user(&arg, value, sizeof(int)))
2154 return -EFAULT;
2155
2156 switch (cmd) {
2157 case TIOCMBIS:
2158 if (arg & TIOCM_RTS)
2159 mcr |= MCR_RTS;
2160 if (arg & TIOCM_DTR)
2161 mcr |= MCR_RTS;
2162 if (arg & TIOCM_LOOP)
2163 mcr |= MCR_LOOPBACK;
2164 break;
2165
2166 case TIOCMBIC:
2167 if (arg & TIOCM_RTS)
2168 mcr &= ~MCR_RTS;
2169 if (arg & TIOCM_DTR)
2170 mcr &= ~MCR_RTS;
2171 if (arg & TIOCM_LOOP)
2172 mcr &= ~MCR_LOOPBACK;
2173 break;
2174
2175 case TIOCMSET:
2176 /* turn off the RTS and DTR and LOOPBACK
2177 * and then only turn on what was asked to */
2178 mcr &= ~(MCR_RTS | MCR_DTR | MCR_LOOPBACK);
2179 mcr |= ((arg & TIOCM_RTS) ? MCR_RTS : 0);
2180 mcr |= ((arg & TIOCM_DTR) ? MCR_DTR : 0);
2181 mcr |= ((arg & TIOCM_LOOP) ? MCR_LOOPBACK : 0);
2182 break;
2183 }
2184
2185 lock_kernel();
2186 mos7840_port->shadowMCR = mcr;
2187
2188 Data = mos7840_port->shadowMCR;
2189 status = mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER, Data);
2190 unlock_kernel();
2191 if (status < 0) {
2192 dbg("setting MODEM_CONTROL_REGISTER Failed\n");
2193 return -1;
2194 }
2195
2196 return 0;
2197 }
2198
2199 /*****************************************************************************
2200 * mos7840_get_modem_info
2201 * function to get modem info
2202 *****************************************************************************/
2203
2204 static int mos7840_get_modem_info(struct moschip_port *mos7840_port,
2205 unsigned int __user *value)
2206 {
2207 unsigned int result = 0;
2208 __u16 msr;
2209 unsigned int mcr = mos7840_port->shadowMCR;
2210 mos7840_get_uart_reg(mos7840_port->port,
2211 MODEM_STATUS_REGISTER, &msr);
2212 result = ((mcr & MCR_DTR) ? TIOCM_DTR : 0) /* 0x002 */
2213 |((mcr & MCR_RTS) ? TIOCM_RTS : 0) /* 0x004 */
2214 |((msr & MOS7840_MSR_CTS) ? TIOCM_CTS : 0) /* 0x020 */
2215 |((msr & MOS7840_MSR_CD) ? TIOCM_CAR : 0) /* 0x040 */
2216 |((msr & MOS7840_MSR_RI) ? TIOCM_RI : 0) /* 0x080 */
2217 |((msr & MOS7840_MSR_DSR) ? TIOCM_DSR : 0); /* 0x100 */
2218
2219 dbg("%s -- %x", __func__, result);
2220
2221 if (copy_to_user(value, &result, sizeof(int)))
2222 return -EFAULT;
2223 return 0;
2224 }
2225
2226 /*****************************************************************************
2227 * mos7840_get_serial_info
2228 * function to get information about serial port
2229 *****************************************************************************/
2230
2231 static int mos7840_get_serial_info(struct moschip_port *mos7840_port,
2232 struct serial_struct __user *retinfo)
2233 {
2234 struct serial_struct tmp;
2235
2236 if (mos7840_port == NULL)
2237 return -1;
2238
2239 if (!retinfo)
2240 return -EFAULT;
2241
2242 memset(&tmp, 0, sizeof(tmp));
2243
2244 tmp.type = PORT_16550A;
2245 tmp.line = mos7840_port->port->serial->minor;
2246 tmp.port = mos7840_port->port->number;
2247 tmp.irq = 0;
2248 tmp.flags = ASYNC_SKIP_TEST | ASYNC_AUTO_IRQ;
2249 tmp.xmit_fifo_size = NUM_URBS * URB_TRANSFER_BUFFER_SIZE;
2250 tmp.baud_base = 9600;
2251 tmp.close_delay = 5 * HZ;
2252 tmp.closing_wait = 30 * HZ;
2253
2254 if (copy_to_user(retinfo, &tmp, sizeof(*retinfo)))
2255 return -EFAULT;
2256 return 0;
2257 }
2258
2259 /*****************************************************************************
2260 * SerialIoctl
2261 * this function handles any ioctl calls to the driver
2262 *****************************************************************************/
2263
2264 static int mos7840_ioctl(struct tty_struct *tty, struct file *file,
2265 unsigned int cmd, unsigned long arg)
2266 {
2267 struct usb_serial_port *port = tty->driver_data;
2268 void __user *argp = (void __user *)arg;
2269 struct moschip_port *mos7840_port;
2270
2271 struct async_icount cnow;
2272 struct async_icount cprev;
2273 struct serial_icounter_struct icount;
2274 int mosret = 0;
2275
2276 if (mos7840_port_paranoia_check(port, __func__)) {
2277 dbg("%s", "Invalid port \n");
2278 return -1;
2279 }
2280
2281 mos7840_port = mos7840_get_port_private(port);
2282
2283 if (mos7840_port == NULL)
2284 return -1;
2285
2286 dbg("%s - port %d, cmd = 0x%x", __func__, port->number, cmd);
2287
2288 switch (cmd) {
2289 /* return number of bytes available */
2290
2291 case TIOCSERGETLSR:
2292 dbg("%s (%d) TIOCSERGETLSR", __func__, port->number);
2293 return mos7840_get_lsr_info(tty, argp);
2294 return 0;
2295
2296 /* FIXME: use the modem hooks and remove this */
2297 case TIOCMBIS:
2298 case TIOCMBIC:
2299 case TIOCMSET:
2300 dbg("%s (%d) TIOCMSET/TIOCMBIC/TIOCMSET", __func__,
2301 port->number);
2302 mosret =
2303 mos7840_set_modem_info(mos7840_port, cmd, argp);
2304 return mosret;
2305
2306 case TIOCMGET:
2307 dbg("%s (%d) TIOCMGET", __func__, port->number);
2308 return mos7840_get_modem_info(mos7840_port, argp);
2309
2310 case TIOCGSERIAL:
2311 dbg("%s (%d) TIOCGSERIAL", __func__, port->number);
2312 return mos7840_get_serial_info(mos7840_port, argp);
2313
2314 case TIOCSSERIAL:
2315 dbg("%s (%d) TIOCSSERIAL", __func__, port->number);
2316 break;
2317
2318 case TIOCMIWAIT:
2319 dbg("%s (%d) TIOCMIWAIT", __func__, port->number);
2320 cprev = mos7840_port->icount;
2321 while (1) {
2322 /* interruptible_sleep_on(&mos7840_port->delta_msr_wait); */
2323 mos7840_port->delta_msr_cond = 0;
2324 wait_event_interruptible(mos7840_port->delta_msr_wait,
2325 (mos7840_port->
2326 delta_msr_cond == 1));
2327
2328 /* see if a signal did it */
2329 if (signal_pending(current))
2330 return -ERESTARTSYS;
2331 cnow = mos7840_port->icount;
2332 smp_rmb();
2333 if (cnow.rng == cprev.rng && cnow.dsr == cprev.dsr &&
2334 cnow.dcd == cprev.dcd && cnow.cts == cprev.cts)
2335 return -EIO; /* no change => error */
2336 if (((arg & TIOCM_RNG) && (cnow.rng != cprev.rng)) ||
2337 ((arg & TIOCM_DSR) && (cnow.dsr != cprev.dsr)) ||
2338 ((arg & TIOCM_CD) && (cnow.dcd != cprev.dcd)) ||
2339 ((arg & TIOCM_CTS) && (cnow.cts != cprev.cts))) {
2340 return 0;
2341 }
2342 cprev = cnow;
2343 }
2344 /* NOTREACHED */
2345 break;
2346
2347 case TIOCGICOUNT:
2348 cnow = mos7840_port->icount;
2349 smp_rmb();
2350 icount.cts = cnow.cts;
2351 icount.dsr = cnow.dsr;
2352 icount.rng = cnow.rng;
2353 icount.dcd = cnow.dcd;
2354 icount.rx = cnow.rx;
2355 icount.tx = cnow.tx;
2356 icount.frame = cnow.frame;
2357 icount.overrun = cnow.overrun;
2358 icount.parity = cnow.parity;
2359 icount.brk = cnow.brk;
2360 icount.buf_overrun = cnow.buf_overrun;
2361
2362 dbg("%s (%d) TIOCGICOUNT RX=%d, TX=%d", __func__,
2363 port->number, icount.rx, icount.tx);
2364 if (copy_to_user(argp, &icount, sizeof(icount)))
2365 return -EFAULT;
2366 return 0;
2367 default:
2368 break;
2369 }
2370 return -ENOIOCTLCMD;
2371 }
2372
2373 static int mos7840_calc_num_ports(struct usb_serial *serial)
2374 {
2375 int mos7840_num_ports = 0;
2376
2377 dbg("numberofendpoints: %d \n",
2378 (int)serial->interface->cur_altsetting->desc.bNumEndpoints);
2379 dbg("numberofendpoints: %d \n",
2380 (int)serial->interface->altsetting->desc.bNumEndpoints);
2381 if (serial->interface->cur_altsetting->desc.bNumEndpoints == 5) {
2382 mos7840_num_ports = serial->num_ports = 2;
2383 } else if (serial->interface->cur_altsetting->desc.bNumEndpoints == 9) {
2384 serial->num_bulk_in = 4;
2385 serial->num_bulk_out = 4;
2386 mos7840_num_ports = serial->num_ports = 4;
2387 }
2388
2389 return mos7840_num_ports;
2390 }
2391
2392 /****************************************************************************
2393 * mos7840_startup
2394 ****************************************************************************/
2395
2396 static int mos7840_startup(struct usb_serial *serial)
2397 {
2398 struct moschip_port *mos7840_port;
2399 struct usb_device *dev;
2400 int i, status;
2401
2402 __u16 Data;
2403 dbg("%s \n", " mos7840_startup :entering..........");
2404
2405 if (!serial) {
2406 dbg("%s\n", "Invalid Handler");
2407 return -1;
2408 }
2409
2410 dev = serial->dev;
2411
2412 dbg("%s\n", "Entering...");
2413
2414 /* we set up the pointers to the endpoints in the mos7840_open *
2415 * function, as the structures aren't created yet. */
2416
2417 /* set up port private structures */
2418 for (i = 0; i < serial->num_ports; ++i) {
2419 mos7840_port = kzalloc(sizeof(struct moschip_port), GFP_KERNEL);
2420 if (mos7840_port == NULL) {
2421 dev_err(&dev->dev, "%s - Out of memory\n", __func__);
2422 status = -ENOMEM;
2423 i--; /* don't follow NULL pointer cleaning up */
2424 goto error;
2425 }
2426
2427 /* Initialize all port interrupt end point to port 0 int
2428 * endpoint. Our device has only one interrupt end point
2429 * common to all port */
2430
2431 mos7840_port->port = serial->port[i];
2432 mos7840_set_port_private(serial->port[i], mos7840_port);
2433 spin_lock_init(&mos7840_port->pool_lock);
2434
2435 /* minor is not initialised until later by
2436 * usb-serial.c:get_free_serial() and cannot therefore be used
2437 * to index device instances */
2438 mos7840_port->port_num = i + 1;
2439 dbg ("serial->port[i]->number = %d", serial->port[i]->number);
2440 dbg ("serial->port[i]->serial->minor = %d", serial->port[i]->serial->minor);
2441 dbg ("mos7840_port->port_num = %d", mos7840_port->port_num);
2442 dbg ("serial->minor = %d", serial->minor);
2443
2444 if (mos7840_port->port_num == 1) {
2445 mos7840_port->SpRegOffset = 0x0;
2446 mos7840_port->ControlRegOffset = 0x1;
2447 mos7840_port->DcrRegOffset = 0x4;
2448 } else if ((mos7840_port->port_num == 2)
2449 && (serial->num_ports == 4)) {
2450 mos7840_port->SpRegOffset = 0x8;
2451 mos7840_port->ControlRegOffset = 0x9;
2452 mos7840_port->DcrRegOffset = 0x16;
2453 } else if ((mos7840_port->port_num == 2)
2454 && (serial->num_ports == 2)) {
2455 mos7840_port->SpRegOffset = 0xa;
2456 mos7840_port->ControlRegOffset = 0xb;
2457 mos7840_port->DcrRegOffset = 0x19;
2458 } else if ((mos7840_port->port_num == 3)
2459 && (serial->num_ports == 4)) {
2460 mos7840_port->SpRegOffset = 0xa;
2461 mos7840_port->ControlRegOffset = 0xb;
2462 mos7840_port->DcrRegOffset = 0x19;
2463 } else if ((mos7840_port->port_num == 4)
2464 && (serial->num_ports == 4)) {
2465 mos7840_port->SpRegOffset = 0xc;
2466 mos7840_port->ControlRegOffset = 0xd;
2467 mos7840_port->DcrRegOffset = 0x1c;
2468 }
2469 mos7840_dump_serial_port(mos7840_port);
2470 mos7840_set_port_private(serial->port[i], mos7840_port);
2471
2472 /* enable rx_disable bit in control register */
2473 status = mos7840_get_reg_sync(serial->port[i],
2474 mos7840_port->ControlRegOffset, &Data);
2475 if (status < 0) {
2476 dbg("Reading ControlReg failed status-0x%x\n", status);
2477 break;
2478 } else
2479 dbg("ControlReg Reading success val is %x, status%d\n",
2480 Data, status);
2481 Data |= 0x08; /* setting driver done bit */
2482 Data |= 0x04; /* sp1_bit to have cts change reflect in
2483 modem status reg */
2484
2485 /* Data |= 0x20; //rx_disable bit */
2486 status = mos7840_set_reg_sync(serial->port[i],
2487 mos7840_port->ControlRegOffset, Data);
2488 if (status < 0) {
2489 dbg("Writing ControlReg failed(rx_disable) status-0x%x\n", status);
2490 break;
2491 } else
2492 dbg("ControlReg Writing success(rx_disable) status%d\n",
2493 status);
2494
2495 /* Write default values in DCR (i.e 0x01 in DCR0, 0x05 in DCR2
2496 and 0x24 in DCR3 */
2497 Data = 0x01;
2498 status = mos7840_set_reg_sync(serial->port[i],
2499 (__u16) (mos7840_port->DcrRegOffset + 0), Data);
2500 if (status < 0) {
2501 dbg("Writing DCR0 failed status-0x%x\n", status);
2502 break;
2503 } else
2504 dbg("DCR0 Writing success status%d\n", status);
2505
2506 Data = 0x05;
2507 status = mos7840_set_reg_sync(serial->port[i],
2508 (__u16) (mos7840_port->DcrRegOffset + 1), Data);
2509 if (status < 0) {
2510 dbg("Writing DCR1 failed status-0x%x\n", status);
2511 break;
2512 } else
2513 dbg("DCR1 Writing success status%d\n", status);
2514
2515 Data = 0x24;
2516 status = mos7840_set_reg_sync(serial->port[i],
2517 (__u16) (mos7840_port->DcrRegOffset + 2), Data);
2518 if (status < 0) {
2519 dbg("Writing DCR2 failed status-0x%x\n", status);
2520 break;
2521 } else
2522 dbg("DCR2 Writing success status%d\n", status);
2523
2524 /* write values in clkstart0x0 and clkmulti 0x20 */
2525 Data = 0x0;
2526 status = mos7840_set_reg_sync(serial->port[i],
2527 CLK_START_VALUE_REGISTER, Data);
2528 if (status < 0) {
2529 dbg("Writing CLK_START_VALUE_REGISTER failed status-0x%x\n", status);
2530 break;
2531 } else
2532 dbg("CLK_START_VALUE_REGISTER Writing success status%d\n", status);
2533
2534 Data = 0x20;
2535 status = mos7840_set_reg_sync(serial->port[i],
2536 CLK_MULTI_REGISTER, Data);
2537 if (status < 0) {
2538 dbg("Writing CLK_MULTI_REGISTER failed status-0x%x\n",
2539 status);
2540 goto error;
2541 } else
2542 dbg("CLK_MULTI_REGISTER Writing success status%d\n",
2543 status);
2544
2545 /* write value 0x0 to scratchpad register */
2546 Data = 0x00;
2547 status = mos7840_set_uart_reg(serial->port[i],
2548 SCRATCH_PAD_REGISTER, Data);
2549 if (status < 0) {
2550 dbg("Writing SCRATCH_PAD_REGISTER failed status-0x%x\n",
2551 status);
2552 break;
2553 } else
2554 dbg("SCRATCH_PAD_REGISTER Writing success status%d\n",
2555 status);
2556
2557 /* Zero Length flag register */
2558 if ((mos7840_port->port_num != 1)
2559 && (serial->num_ports == 2)) {
2560
2561 Data = 0xff;
2562 status = mos7840_set_reg_sync(serial->port[i],
2563 (__u16) (ZLP_REG1 +
2564 ((__u16)mos7840_port->port_num)), Data);
2565 dbg("ZLIP offset%x\n",
2566 (__u16) (ZLP_REG1 +
2567 ((__u16) mos7840_port->port_num)));
2568 if (status < 0) {
2569 dbg("Writing ZLP_REG%d failed status-0x%x\n",
2570 i + 2, status);
2571 break;
2572 } else
2573 dbg("ZLP_REG%d Writing success status%d\n",
2574 i + 2, status);
2575 } else {
2576 Data = 0xff;
2577 status = mos7840_set_reg_sync(serial->port[i],
2578 (__u16) (ZLP_REG1 +
2579 ((__u16)mos7840_port->port_num) - 0x1), Data);
2580 dbg("ZLIP offset%x\n",
2581 (__u16) (ZLP_REG1 +
2582 ((__u16) mos7840_port->port_num) - 0x1));
2583 if (status < 0) {
2584 dbg("Writing ZLP_REG%d failed status-0x%x\n",
2585 i + 1, status);
2586 break;
2587 } else
2588 dbg("ZLP_REG%d Writing success status%d\n",
2589 i + 1, status);
2590
2591 }
2592 mos7840_port->control_urb = usb_alloc_urb(0, GFP_KERNEL);
2593 mos7840_port->ctrl_buf = kmalloc(16, GFP_KERNEL);
2594 mos7840_port->dr = kmalloc(sizeof(struct usb_ctrlrequest),
2595 GFP_KERNEL);
2596 if (!mos7840_port->control_urb || !mos7840_port->ctrl_buf ||
2597 !mos7840_port->dr) {
2598 status = -ENOMEM;
2599 goto error;
2600 }
2601 }
2602
2603 /* Zero Length flag enable */
2604 Data = 0x0f;
2605 status = mos7840_set_reg_sync(serial->port[0], ZLP_REG5, Data);
2606 if (status < 0) {
2607 dbg("Writing ZLP_REG5 failed status-0x%x\n", status);
2608 goto error;
2609 } else
2610 dbg("ZLP_REG5 Writing success status%d\n", status);
2611
2612 /* setting configuration feature to one */
2613 usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0),
2614 (__u8) 0x03, 0x00, 0x01, 0x00, NULL, 0x00, 5 * HZ);
2615 return 0;
2616 error:
2617 for (/* nothing */; i >= 0; i--) {
2618 mos7840_port = mos7840_get_port_private(serial->port[i]);
2619
2620 kfree(mos7840_port->dr);
2621 kfree(mos7840_port->ctrl_buf);
2622 usb_free_urb(mos7840_port->control_urb);
2623 kfree(mos7840_port);
2624 serial->port[i] = NULL;
2625 }
2626 return status;
2627 }
2628
2629 /****************************************************************************
2630 * mos7840_shutdown
2631 * This function is called whenever the device is removed from the usb bus.
2632 ****************************************************************************/
2633
2634 static void mos7840_shutdown(struct usb_serial *serial)
2635 {
2636 int i;
2637 unsigned long flags;
2638 struct moschip_port *mos7840_port;
2639 dbg("%s \n", " shutdown :entering..........");
2640
2641 if (!serial) {
2642 dbg("%s", "Invalid Handler \n");
2643 return;
2644 }
2645
2646 /* check for the ports to be closed,close the ports and disconnect */
2647
2648 /* free private structure allocated for serial port *
2649 * stop reads and writes on all ports */
2650
2651 for (i = 0; i < serial->num_ports; ++i) {
2652 mos7840_port = mos7840_get_port_private(serial->port[i]);
2653 dbg ("mos7840_port %d = %p", i, mos7840_port);
2654 if (mos7840_port) {
2655 spin_lock_irqsave(&mos7840_port->pool_lock, flags);
2656 mos7840_port->zombie = 1;
2657 spin_unlock_irqrestore(&mos7840_port->pool_lock, flags);
2658 usb_kill_urb(mos7840_port->control_urb);
2659 kfree(mos7840_port->ctrl_buf);
2660 kfree(mos7840_port->dr);
2661 kfree(mos7840_port);
2662 }
2663 mos7840_set_port_private(serial->port[i], NULL);
2664 }
2665
2666 dbg("%s\n", "Thank u :: ");
2667
2668 }
2669
2670 static struct usb_driver io_driver = {
2671 .name = "mos7840",
2672 .probe = usb_serial_probe,
2673 .disconnect = usb_serial_disconnect,
2674 .id_table = moschip_id_table_combined,
2675 .no_dynamic_id = 1,
2676 };
2677
2678 static struct usb_serial_driver moschip7840_4port_device = {
2679 .driver = {
2680 .owner = THIS_MODULE,
2681 .name = "mos7840",
2682 },
2683 .description = DRIVER_DESC,
2684 .usb_driver = &io_driver,
2685 .id_table = moschip_port_id_table,
2686 .num_ports = 4,
2687 .open = mos7840_open,
2688 .close = mos7840_close,
2689 .write = mos7840_write,
2690 .write_room = mos7840_write_room,
2691 .chars_in_buffer = mos7840_chars_in_buffer,
2692 .throttle = mos7840_throttle,
2693 .unthrottle = mos7840_unthrottle,
2694 .calc_num_ports = mos7840_calc_num_ports,
2695 #ifdef MCSSerialProbe
2696 .probe = mos7840_serial_probe,
2697 #endif
2698 .ioctl = mos7840_ioctl,
2699 .set_termios = mos7840_set_termios,
2700 .break_ctl = mos7840_break,
2701 .tiocmget = mos7840_tiocmget,
2702 .tiocmset = mos7840_tiocmset,
2703 .attach = mos7840_startup,
2704 .shutdown = mos7840_shutdown,
2705 .read_bulk_callback = mos7840_bulk_in_callback,
2706 .read_int_callback = mos7840_interrupt_callback,
2707 };
2708
2709 /****************************************************************************
2710 * moschip7840_init
2711 * This is called by the module subsystem, or on startup to initialize us
2712 ****************************************************************************/
2713 static int __init moschip7840_init(void)
2714 {
2715 int retval;
2716
2717 dbg("%s \n", " mos7840_init :entering..........");
2718
2719 /* Register with the usb serial */
2720 retval = usb_serial_register(&moschip7840_4port_device);
2721
2722 if (retval)
2723 goto failed_port_device_register;
2724
2725 dbg("%s\n", "Entring...");
2726 printk(KERN_INFO KBUILD_MODNAME ": " DRIVER_VERSION ":"
2727 DRIVER_DESC "\n");
2728
2729 /* Register with the usb */
2730 retval = usb_register(&io_driver);
2731 if (retval == 0) {
2732 dbg("%s\n", "Leaving...");
2733 return 0;
2734 }
2735 usb_serial_deregister(&moschip7840_4port_device);
2736 failed_port_device_register:
2737 return retval;
2738 }
2739
2740 /****************************************************************************
2741 * moschip7840_exit
2742 * Called when the driver is about to be unloaded.
2743 ****************************************************************************/
2744 static void __exit moschip7840_exit(void)
2745 {
2746
2747 dbg("%s \n", " mos7840_exit :entering..........");
2748
2749 usb_deregister(&io_driver);
2750
2751 usb_serial_deregister(&moschip7840_4port_device);
2752
2753 dbg("%s\n", "Entring...");
2754 }
2755
2756 module_init(moschip7840_init);
2757 module_exit(moschip7840_exit);
2758
2759 /* Module information */
2760 MODULE_DESCRIPTION(DRIVER_DESC);
2761 MODULE_LICENSE("GPL");
2762
2763 module_param(debug, bool, S_IRUGO | S_IWUSR);
2764 MODULE_PARM_DESC(debug, "Debug enabled or not");
linux 2.6 git repository for openrd