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Merge branch 'for-2.6.32' into mxc
[deliverable/linux.git] / drivers / usb / serial / mos7840.c
1 /*
2 * This program is free software; you can redistribute it and/or modify
3 * it under the terms of the GNU General Public License as published by
4 * the Free Software Foundation; either version 2 of the License, or
5 * (at your option) any later version.
6 *
7 * This program is distributed in the hope that it will be useful,
8 * but WITHOUT ANY WARRANTY; without even the implied warranty of
9 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
10 * GNU General Public License for more details.
11 *
12 * You should have received a copy of the GNU General Public License
13 * along with this program; if not, write to the Free Software
14 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
15 *
16 * Clean ups from Moschip version and a few ioctl implementations by:
17 * Paul B Schroeder <pschroeder "at" uplogix "dot" com>
18 *
19 * Originally based on drivers/usb/serial/io_edgeport.c which is:
20 * Copyright (C) 2000 Inside Out Networks, All rights reserved.
21 * Copyright (C) 2001-2002 Greg Kroah-Hartman <greg@kroah.com>
22 *
23 */
24
25 #include <linux/kernel.h>
26 #include <linux/errno.h>
27 #include <linux/init.h>
28 #include <linux/slab.h>
29 #include <linux/tty.h>
30 #include <linux/tty_driver.h>
31 #include <linux/tty_flip.h>
32 #include <linux/module.h>
33 #include <linux/serial.h>
34 #include <linux/usb.h>
35 #include <linux/usb/serial.h>
36 #include <linux/uaccess.h>
37
38 /*
39 * Version Information
40 */
41 #define DRIVER_VERSION "1.3.2"
42 #define DRIVER_DESC "Moschip 7840/7820 USB Serial Driver"
43
44 /*
45 * 16C50 UART register defines
46 */
47
48 #define LCR_BITS_5 0x00 /* 5 bits/char */
49 #define LCR_BITS_6 0x01 /* 6 bits/char */
50 #define LCR_BITS_7 0x02 /* 7 bits/char */
51 #define LCR_BITS_8 0x03 /* 8 bits/char */
52 #define LCR_BITS_MASK 0x03 /* Mask for bits/char field */
53
54 #define LCR_STOP_1 0x00 /* 1 stop bit */
55 #define LCR_STOP_1_5 0x04 /* 1.5 stop bits (if 5 bits/char) */
56 #define LCR_STOP_2 0x04 /* 2 stop bits (if 6-8 bits/char) */
57 #define LCR_STOP_MASK 0x04 /* Mask for stop bits field */
58
59 #define LCR_PAR_NONE 0x00 /* No parity */
60 #define LCR_PAR_ODD 0x08 /* Odd parity */
61 #define LCR_PAR_EVEN 0x18 /* Even parity */
62 #define LCR_PAR_MARK 0x28 /* Force parity bit to 1 */
63 #define LCR_PAR_SPACE 0x38 /* Force parity bit to 0 */
64 #define LCR_PAR_MASK 0x38 /* Mask for parity field */
65
66 #define LCR_SET_BREAK 0x40 /* Set Break condition */
67 #define LCR_DL_ENABLE 0x80 /* Enable access to divisor latch */
68
69 #define MCR_DTR 0x01 /* Assert DTR */
70 #define MCR_RTS 0x02 /* Assert RTS */
71 #define MCR_OUT1 0x04 /* Loopback only: Sets state of RI */
72 #define MCR_MASTER_IE 0x08 /* Enable interrupt outputs */
73 #define MCR_LOOPBACK 0x10 /* Set internal (digital) loopback mode */
74 #define MCR_XON_ANY 0x20 /* Enable any char to exit XOFF mode */
75
76 #define MOS7840_MSR_CTS 0x10 /* Current state of CTS */
77 #define MOS7840_MSR_DSR 0x20 /* Current state of DSR */
78 #define MOS7840_MSR_RI 0x40 /* Current state of RI */
79 #define MOS7840_MSR_CD 0x80 /* Current state of CD */
80
81 /*
82 * Defines used for sending commands to port
83 */
84
85 #define WAIT_FOR_EVER (HZ * 0) /* timeout urb is wait for ever */
86 #define MOS_WDR_TIMEOUT (HZ * 5) /* default urb timeout */
87
88 #define MOS_PORT1 0x0200
89 #define MOS_PORT2 0x0300
90 #define MOS_VENREG 0x0000
91 #define MOS_MAX_PORT 0x02
92 #define MOS_WRITE 0x0E
93 #define MOS_READ 0x0D
94
95 /* Requests */
96 #define MCS_RD_RTYPE 0xC0
97 #define MCS_WR_RTYPE 0x40
98 #define MCS_RDREQ 0x0D
99 #define MCS_WRREQ 0x0E
100 #define MCS_CTRL_TIMEOUT 500
101 #define VENDOR_READ_LENGTH (0x01)
102
103 #define MAX_NAME_LEN 64
104
105 #define ZLP_REG1 0x3A /* Zero_Flag_Reg1 58 */
106 #define ZLP_REG5 0x3E /* Zero_Flag_Reg5 62 */
107
108 /* For higher baud Rates use TIOCEXBAUD */
109 #define TIOCEXBAUD 0x5462
110
111 /* vendor id and device id defines */
112
113 /* The native mos7840/7820 component */
114 #define USB_VENDOR_ID_MOSCHIP 0x9710
115 #define MOSCHIP_DEVICE_ID_7840 0x7840
116 #define MOSCHIP_DEVICE_ID_7820 0x7820
117 /* The native component can have its vendor/device id's overridden
118 * in vendor-specific implementations. Such devices can be handled
119 * by making a change here, in moschip_port_id_table, and in
120 * moschip_id_table_combined
121 */
122 #define USB_VENDOR_ID_BANDB 0x0856
123 #define BANDB_DEVICE_ID_USOPTL4_4 0xAC44
124 #define BANDB_DEVICE_ID_USOPTL4_2 0xAC42
125
126 /* This driver also supports the ATEN UC2324 device since it is mos7840 based
127 * - if I knew the device id it would also support the ATEN UC2322 */
128 #define USB_VENDOR_ID_ATENINTL 0x0557
129 #define ATENINTL_DEVICE_ID_UC2324 0x2011
130
131 /* Interrupt Routine Defines */
132
133 #define SERIAL_IIR_RLS 0x06
134 #define SERIAL_IIR_MS 0x00
135
136 /*
137 * Emulation of the bit mask on the LINE STATUS REGISTER.
138 */
139 #define SERIAL_LSR_DR 0x0001
140 #define SERIAL_LSR_OE 0x0002
141 #define SERIAL_LSR_PE 0x0004
142 #define SERIAL_LSR_FE 0x0008
143 #define SERIAL_LSR_BI 0x0010
144
145 #define MOS_MSR_DELTA_CTS 0x10
146 #define MOS_MSR_DELTA_DSR 0x20
147 #define MOS_MSR_DELTA_RI 0x40
148 #define MOS_MSR_DELTA_CD 0x80
149
150 /* Serial Port register Address */
151 #define INTERRUPT_ENABLE_REGISTER ((__u16)(0x01))
152 #define FIFO_CONTROL_REGISTER ((__u16)(0x02))
153 #define LINE_CONTROL_REGISTER ((__u16)(0x03))
154 #define MODEM_CONTROL_REGISTER ((__u16)(0x04))
155 #define LINE_STATUS_REGISTER ((__u16)(0x05))
156 #define MODEM_STATUS_REGISTER ((__u16)(0x06))
157 #define SCRATCH_PAD_REGISTER ((__u16)(0x07))
158 #define DIVISOR_LATCH_LSB ((__u16)(0x00))
159 #define DIVISOR_LATCH_MSB ((__u16)(0x01))
160
161 #define CLK_MULTI_REGISTER ((__u16)(0x02))
162 #define CLK_START_VALUE_REGISTER ((__u16)(0x03))
163
164 #define SERIAL_LCR_DLAB ((__u16)(0x0080))
165
166 /*
167 * URB POOL related defines
168 */
169 #define NUM_URBS 16 /* URB Count */
170 #define URB_TRANSFER_BUFFER_SIZE 32 /* URB Size */
171
172
173 static struct usb_device_id moschip_port_id_table[] = {
174 {USB_DEVICE(USB_VENDOR_ID_MOSCHIP, MOSCHIP_DEVICE_ID_7840)},
175 {USB_DEVICE(USB_VENDOR_ID_MOSCHIP, MOSCHIP_DEVICE_ID_7820)},
176 {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USOPTL4_4)},
177 {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USOPTL4_2)},
178 {USB_DEVICE(USB_VENDOR_ID_ATENINTL, ATENINTL_DEVICE_ID_UC2324)},
179 {} /* terminating entry */
180 };
181
182 static __devinitdata struct usb_device_id moschip_id_table_combined[] = {
183 {USB_DEVICE(USB_VENDOR_ID_MOSCHIP, MOSCHIP_DEVICE_ID_7840)},
184 {USB_DEVICE(USB_VENDOR_ID_MOSCHIP, MOSCHIP_DEVICE_ID_7820)},
185 {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USOPTL4_4)},
186 {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USOPTL4_2)},
187 {USB_DEVICE(USB_VENDOR_ID_ATENINTL, ATENINTL_DEVICE_ID_UC2324)},
188 {} /* terminating entry */
189 };
190
191 MODULE_DEVICE_TABLE(usb, moschip_id_table_combined);
192
193 /* This structure holds all of the local port information */
194
195 struct moschip_port {
196 int port_num; /*Actual port number in the device(1,2,etc) */
197 struct urb *write_urb; /* write URB for this port */
198 struct urb *read_urb; /* read URB for this port */
199 struct urb *int_urb;
200 __u8 shadowLCR; /* last LCR value received */
201 __u8 shadowMCR; /* last MCR value received */
202 char open;
203 char open_ports;
204 char zombie;
205 wait_queue_head_t wait_chase; /* for handling sleeping while waiting for chase to finish */
206 wait_queue_head_t delta_msr_wait; /* for handling sleeping while waiting for msr change to happen */
207 int delta_msr_cond;
208 struct async_icount icount;
209 struct usb_serial_port *port; /* loop back to the owner of this object */
210
211 /* Offsets */
212 __u8 SpRegOffset;
213 __u8 ControlRegOffset;
214 __u8 DcrRegOffset;
215 /* for processing control URBS in interrupt context */
216 struct urb *control_urb;
217 struct usb_ctrlrequest *dr;
218 char *ctrl_buf;
219 int MsrLsr;
220
221 spinlock_t pool_lock;
222 struct urb *write_urb_pool[NUM_URBS];
223 char busy[NUM_URBS];
224 bool read_urb_busy;
225 };
226
227
228 static int debug;
229
230 /*
231 * mos7840_set_reg_sync
232 * To set the Control register by calling usb_fill_control_urb function
233 * by passing usb_sndctrlpipe function as parameter.
234 */
235
236 static int mos7840_set_reg_sync(struct usb_serial_port *port, __u16 reg,
237 __u16 val)
238 {
239 struct usb_device *dev = port->serial->dev;
240 val = val & 0x00ff;
241 dbg("mos7840_set_reg_sync offset is %x, value %x", 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", 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", 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",
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",
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",
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", 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",
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",
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("***************************************");
350 dbg("SpRegOffset is %2x", mos7840_port->SpRegOffset);
351 dbg("ControlRegOffset is %2x", mos7840_port->ControlRegOffset);
352 dbg("DCRRegOffset is %2x", mos7840_port->DcrRegOffset);
353 dbg("***************************************");
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", __func__, urb->actual_length);
478 dbg("%s mos7840_port->MsrLsr is %d port %d", __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", __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");
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", "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 !!!", 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");
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", 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");
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");
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", "Bad serial pointer");
713 mos7840_port->read_urb_busy = false;
714 return;
715 }
716
717 dbg("%s", "Entering... ");
718
719 data = urb->transfer_buffer;
720
721 dbg("%s", "Entering ...........");
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 ", 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:",
735 mos7840_port->icount.rx);
736 }
737
738 if (!mos7840_port->read_urb) {
739 dbg("%s", "URB KILLED !!!");
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", status);
781 return;
782 }
783
784 if (mos7840_port_paranoia_check(mos7840_port->port, __func__)) {
785 dbg("%s", "Port Paranoia failed");
786 return;
787 }
788
789 dbg("%s", "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 dbg ("%s enter", __func__);
834
835 if (mos7840_port_paranoia_check(port, __func__)) {
836 dbg("%s", "Port Paranoia failed");
837 return -ENODEV;
838 }
839
840 serial = port->serial;
841
842 if (mos7840_serial_paranoia_check(serial, __func__)) {
843 dbg("%s", "Serial Paranoia failed");
844 return -ENODEV;
845 }
846
847 mos7840_port = mos7840_get_port_private(port);
848 port0 = mos7840_get_port_private(serial->port[0]);
849
850 if (mos7840_port == NULL || port0 == NULL)
851 return -ENODEV;
852
853 usb_clear_halt(serial->dev, port->write_urb->pipe);
854 usb_clear_halt(serial->dev, port->read_urb->pipe);
855 port0->open_ports++;
856
857 /* Initialising the write urb pool */
858 for (j = 0; j < NUM_URBS; ++j) {
859 urb = usb_alloc_urb(0, GFP_KERNEL);
860 mos7840_port->write_urb_pool[j] = urb;
861
862 if (urb == NULL) {
863 dev_err(&port->dev, "No more urbs???\n");
864 continue;
865 }
866
867 urb->transfer_buffer = kmalloc(URB_TRANSFER_BUFFER_SIZE,
868 GFP_KERNEL);
869 if (!urb->transfer_buffer) {
870 usb_free_urb(urb);
871 mos7840_port->write_urb_pool[j] = NULL;
872 dev_err(&port->dev,
873 "%s-out of memory for urb buffers.\n",
874 __func__);
875 continue;
876 }
877 }
878
879 /*****************************************************************************
880 * Initialize MCS7840 -- Write Init values to corresponding Registers
881 *
882 * Register Index
883 * 1 : IER
884 * 2 : FCR
885 * 3 : LCR
886 * 4 : MCR
887 *
888 * 0x08 : SP1/2 Control Reg
889 *****************************************************************************/
890
891 /* NEED to check the following Block */
892
893 Data = 0x0;
894 status = mos7840_get_reg_sync(port, mos7840_port->SpRegOffset, &Data);
895 if (status < 0) {
896 dbg("Reading Spreg failed");
897 return -1;
898 }
899 Data |= 0x80;
900 status = mos7840_set_reg_sync(port, mos7840_port->SpRegOffset, Data);
901 if (status < 0) {
902 dbg("writing Spreg failed");
903 return -1;
904 }
905
906 Data &= ~0x80;
907 status = mos7840_set_reg_sync(port, mos7840_port->SpRegOffset, Data);
908 if (status < 0) {
909 dbg("writing Spreg failed");
910 return -1;
911 }
912 /* End of block to be checked */
913
914 Data = 0x0;
915 status = mos7840_get_reg_sync(port, mos7840_port->ControlRegOffset,
916 &Data);
917 if (status < 0) {
918 dbg("Reading Controlreg failed");
919 return -1;
920 }
921 Data |= 0x08; /* Driver done bit */
922 Data |= 0x20; /* rx_disable */
923 status = mos7840_set_reg_sync(port,
924 mos7840_port->ControlRegOffset, Data);
925 if (status < 0) {
926 dbg("writing Controlreg failed");
927 return -1;
928 }
929 /* do register settings here */
930 /* Set all regs to the device default values. */
931 /***********************************
932 * First Disable all interrupts.
933 ***********************************/
934 Data = 0x00;
935 status = mos7840_set_uart_reg(port, INTERRUPT_ENABLE_REGISTER, Data);
936 if (status < 0) {
937 dbg("disabling interrupts failed");
938 return -1;
939 }
940 /* Set FIFO_CONTROL_REGISTER to the default value */
941 Data = 0x00;
942 status = mos7840_set_uart_reg(port, FIFO_CONTROL_REGISTER, Data);
943 if (status < 0) {
944 dbg("Writing FIFO_CONTROL_REGISTER failed");
945 return -1;
946 }
947
948 Data = 0xcf;
949 status = mos7840_set_uart_reg(port, FIFO_CONTROL_REGISTER, Data);
950 if (status < 0) {
951 dbg("Writing FIFO_CONTROL_REGISTER failed");
952 return -1;
953 }
954
955 Data = 0x03;
956 status = mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data);
957 mos7840_port->shadowLCR = Data;
958
959 Data = 0x0b;
960 status = mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER, Data);
961 mos7840_port->shadowMCR = Data;
962
963 Data = 0x00;
964 status = mos7840_get_uart_reg(port, LINE_CONTROL_REGISTER, &Data);
965 mos7840_port->shadowLCR = Data;
966
967 Data |= SERIAL_LCR_DLAB; /* data latch enable in LCR 0x80 */
968 status = mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data);
969
970 Data = 0x0c;
971 status = mos7840_set_uart_reg(port, DIVISOR_LATCH_LSB, Data);
972
973 Data = 0x0;
974 status = mos7840_set_uart_reg(port, DIVISOR_LATCH_MSB, Data);
975
976 Data = 0x00;
977 status = mos7840_get_uart_reg(port, LINE_CONTROL_REGISTER, &Data);
978
979 Data = Data & ~SERIAL_LCR_DLAB;
980 status = mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data);
981 mos7840_port->shadowLCR = Data;
982
983 /* clearing Bulkin and Bulkout Fifo */
984 Data = 0x0;
985 status = mos7840_get_reg_sync(port, mos7840_port->SpRegOffset, &Data);
986
987 Data = Data | 0x0c;
988 status = mos7840_set_reg_sync(port, mos7840_port->SpRegOffset, Data);
989
990 Data = Data & ~0x0c;
991 status = mos7840_set_reg_sync(port, mos7840_port->SpRegOffset, Data);
992 /* Finally enable all interrupts */
993 Data = 0x0c;
994 status = mos7840_set_uart_reg(port, INTERRUPT_ENABLE_REGISTER, Data);
995
996 /* clearing rx_disable */
997 Data = 0x0;
998 status = mos7840_get_reg_sync(port, mos7840_port->ControlRegOffset,
999 &Data);
1000 Data = Data & ~0x20;
1001 status = mos7840_set_reg_sync(port, mos7840_port->ControlRegOffset,
1002 Data);
1003
1004 /* rx_negate */
1005 Data = 0x0;
1006 status = mos7840_get_reg_sync(port, mos7840_port->ControlRegOffset,
1007 &Data);
1008 Data = Data | 0x10;
1009 status = mos7840_set_reg_sync(port, mos7840_port->ControlRegOffset,
1010 Data);
1011
1012 /* Check to see if we've set up our endpoint info yet *
1013 * (can't set it up in mos7840_startup as the structures *
1014 * were not set up at that time.) */
1015 if (port0->open_ports == 1) {
1016 if (serial->port[0]->interrupt_in_buffer == NULL) {
1017 /* set up interrupt urb */
1018 usb_fill_int_urb(serial->port[0]->interrupt_in_urb,
1019 serial->dev,
1020 usb_rcvintpipe(serial->dev,
1021 serial->port[0]->interrupt_in_endpointAddress),
1022 serial->port[0]->interrupt_in_buffer,
1023 serial->port[0]->interrupt_in_urb->
1024 transfer_buffer_length,
1025 mos7840_interrupt_callback,
1026 serial,
1027 serial->port[0]->interrupt_in_urb->interval);
1028
1029 /* start interrupt read for mos7840 *
1030 * will continue as long as mos7840 is connected */
1031
1032 response =
1033 usb_submit_urb(serial->port[0]->interrupt_in_urb,
1034 GFP_KERNEL);
1035 if (response) {
1036 dev_err(&port->dev, "%s - Error %d submitting "
1037 "interrupt urb\n", __func__, response);
1038 }
1039
1040 }
1041
1042 }
1043
1044 /* see if we've set up our endpoint info yet *
1045 * (can't set it up in mos7840_startup as the *
1046 * structures were not set up at that time.) */
1047
1048 dbg("port number is %d", port->number);
1049 dbg("serial number is %d", port->serial->minor);
1050 dbg("Bulkin endpoint is %d", port->bulk_in_endpointAddress);
1051 dbg("BulkOut endpoint is %d", port->bulk_out_endpointAddress);
1052 dbg("Interrupt endpoint is %d", port->interrupt_in_endpointAddress);
1053 dbg("port's number in the device is %d", mos7840_port->port_num);
1054 mos7840_port->read_urb = port->read_urb;
1055
1056 /* set up our bulk in urb */
1057
1058 usb_fill_bulk_urb(mos7840_port->read_urb,
1059 serial->dev,
1060 usb_rcvbulkpipe(serial->dev,
1061 port->bulk_in_endpointAddress),
1062 port->bulk_in_buffer,
1063 mos7840_port->read_urb->transfer_buffer_length,
1064 mos7840_bulk_in_callback, mos7840_port);
1065
1066 dbg("mos7840_open: bulkin endpoint is %d",
1067 port->bulk_in_endpointAddress);
1068 mos7840_port->read_urb_busy = true;
1069 response = usb_submit_urb(mos7840_port->read_urb, GFP_KERNEL);
1070 if (response) {
1071 dev_err(&port->dev, "%s - Error %d submitting control urb\n",
1072 __func__, response);
1073 mos7840_port->read_urb_busy = false;
1074 }
1075
1076 /* initialize our wait queues */
1077 init_waitqueue_head(&mos7840_port->wait_chase);
1078 init_waitqueue_head(&mos7840_port->delta_msr_wait);
1079
1080 /* initialize our icount structure */
1081 memset(&(mos7840_port->icount), 0x00, sizeof(mos7840_port->icount));
1082
1083 /* initialize our port settings */
1084 /* Must set to enable ints! */
1085 mos7840_port->shadowMCR = MCR_MASTER_IE;
1086 /* send a open port command */
1087 mos7840_port->open = 1;
1088 /* mos7840_change_port_settings(mos7840_port,old_termios); */
1089 mos7840_port->icount.tx = 0;
1090 mos7840_port->icount.rx = 0;
1091
1092 dbg("usb_serial serial:%p mos7840_port:%p\n usb_serial_port port:%p",
1093 serial, mos7840_port, port);
1094
1095 dbg ("%s leave", __func__);
1096
1097 return 0;
1098
1099 }
1100
1101 /*****************************************************************************
1102 * mos7840_chars_in_buffer
1103 * this function is called by the tty driver when it wants to know how many
1104 * bytes of data we currently have outstanding in the port (data that has
1105 * been written, but hasn't made it out the port yet)
1106 * If successful, we return the number of bytes left to be written in the
1107 * system,
1108 * Otherwise we return zero.
1109 *****************************************************************************/
1110
1111 static int mos7840_chars_in_buffer(struct tty_struct *tty)
1112 {
1113 struct usb_serial_port *port = tty->driver_data;
1114 int i;
1115 int chars = 0;
1116 unsigned long flags;
1117 struct moschip_port *mos7840_port;
1118
1119 dbg("%s", " mos7840_chars_in_buffer:entering ...........");
1120
1121 if (mos7840_port_paranoia_check(port, __func__)) {
1122 dbg("%s", "Invalid port");
1123 return 0;
1124 }
1125
1126 mos7840_port = mos7840_get_port_private(port);
1127 if (mos7840_port == NULL) {
1128 dbg("%s", "mos7840_break:leaving ...........");
1129 return 0;
1130 }
1131
1132 spin_lock_irqsave(&mos7840_port->pool_lock, flags);
1133 for (i = 0; i < NUM_URBS; ++i)
1134 if (mos7840_port->busy[i])
1135 chars += URB_TRANSFER_BUFFER_SIZE;
1136 spin_unlock_irqrestore(&mos7840_port->pool_lock, flags);
1137 dbg("%s - returns %d", __func__, chars);
1138 return chars;
1139
1140 }
1141
1142 /*****************************************************************************
1143 * mos7840_close
1144 * this function is called by the tty driver when a port is closed
1145 *****************************************************************************/
1146
1147 static void mos7840_close(struct usb_serial_port *port)
1148 {
1149 struct usb_serial *serial;
1150 struct moschip_port *mos7840_port;
1151 struct moschip_port *port0;
1152 int j;
1153 __u16 Data;
1154
1155 dbg("%s", "mos7840_close:entering...");
1156
1157 if (mos7840_port_paranoia_check(port, __func__)) {
1158 dbg("%s", "Port Paranoia failed");
1159 return;
1160 }
1161
1162 serial = mos7840_get_usb_serial(port, __func__);
1163 if (!serial) {
1164 dbg("%s", "Serial Paranoia failed");
1165 return;
1166 }
1167
1168 mos7840_port = mos7840_get_port_private(port);
1169 port0 = mos7840_get_port_private(serial->port[0]);
1170
1171 if (mos7840_port == NULL || port0 == NULL)
1172 return;
1173
1174 for (j = 0; j < NUM_URBS; ++j)
1175 usb_kill_urb(mos7840_port->write_urb_pool[j]);
1176
1177 /* Freeing Write URBs */
1178 for (j = 0; j < NUM_URBS; ++j) {
1179 if (mos7840_port->write_urb_pool[j]) {
1180 if (mos7840_port->write_urb_pool[j]->transfer_buffer)
1181 kfree(mos7840_port->write_urb_pool[j]->
1182 transfer_buffer);
1183
1184 usb_free_urb(mos7840_port->write_urb_pool[j]);
1185 }
1186 }
1187
1188 /* While closing port, shutdown all bulk read, write *
1189 * and interrupt read if they exists */
1190 if (serial->dev) {
1191 if (mos7840_port->write_urb) {
1192 dbg("%s", "Shutdown bulk write");
1193 usb_kill_urb(mos7840_port->write_urb);
1194 }
1195 if (mos7840_port->read_urb) {
1196 dbg("%s", "Shutdown bulk read");
1197 usb_kill_urb(mos7840_port->read_urb);
1198 mos7840_port->read_urb_busy = false;
1199 }
1200 if ((&mos7840_port->control_urb)) {
1201 dbg("%s", "Shutdown control read");
1202 /*/ usb_kill_urb (mos7840_port->control_urb); */
1203 }
1204 }
1205 /* if(mos7840_port->ctrl_buf != NULL) */
1206 /* kfree(mos7840_port->ctrl_buf); */
1207 port0->open_ports--;
1208 dbg("mos7840_num_open_ports in close%d:in port%d",
1209 port0->open_ports, port->number);
1210 if (port0->open_ports == 0) {
1211 if (serial->port[0]->interrupt_in_urb) {
1212 dbg("%s", "Shutdown interrupt_in_urb");
1213 usb_kill_urb(serial->port[0]->interrupt_in_urb);
1214 }
1215 }
1216
1217 if (mos7840_port->write_urb) {
1218 /* if this urb had a transfer buffer already (old tx) free it */
1219 if (mos7840_port->write_urb->transfer_buffer != NULL)
1220 kfree(mos7840_port->write_urb->transfer_buffer);
1221 usb_free_urb(mos7840_port->write_urb);
1222 }
1223
1224 Data = 0x0;
1225 mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER, Data);
1226
1227 Data = 0x00;
1228 mos7840_set_uart_reg(port, INTERRUPT_ENABLE_REGISTER, Data);
1229
1230 mos7840_port->open = 0;
1231
1232 dbg("%s", "Leaving ............");
1233 }
1234
1235 /************************************************************************
1236 *
1237 * mos7840_block_until_chase_response
1238 *
1239 * This function will block the close until one of the following:
1240 * 1. Response to our Chase comes from mos7840
1241 * 2. A timeout of 10 seconds without activity has expired
1242 * (1K of mos7840 data @ 2400 baud ==> 4 sec to empty)
1243 *
1244 ************************************************************************/
1245
1246 static void mos7840_block_until_chase_response(struct tty_struct *tty,
1247 struct moschip_port *mos7840_port)
1248 {
1249 int timeout = 1 * HZ;
1250 int wait = 10;
1251 int count;
1252
1253 while (1) {
1254 count = mos7840_chars_in_buffer(tty);
1255
1256 /* Check for Buffer status */
1257 if (count <= 0)
1258 return;
1259
1260 /* Block the thread for a while */
1261 interruptible_sleep_on_timeout(&mos7840_port->wait_chase,
1262 timeout);
1263 /* No activity.. count down section */
1264 wait--;
1265 if (wait == 0) {
1266 dbg("%s - TIMEOUT", __func__);
1267 return;
1268 } else {
1269 /* Reset timeout value back to seconds */
1270 wait = 10;
1271 }
1272 }
1273
1274 }
1275
1276 /*****************************************************************************
1277 * mos7840_break
1278 * this function sends a break to the port
1279 *****************************************************************************/
1280 static void mos7840_break(struct tty_struct *tty, int break_state)
1281 {
1282 struct usb_serial_port *port = tty->driver_data;
1283 unsigned char data;
1284 struct usb_serial *serial;
1285 struct moschip_port *mos7840_port;
1286
1287 dbg("%s", "Entering ...........");
1288 dbg("mos7840_break: Start");
1289
1290 if (mos7840_port_paranoia_check(port, __func__)) {
1291 dbg("%s", "Port Paranoia failed");
1292 return;
1293 }
1294
1295 serial = mos7840_get_usb_serial(port, __func__);
1296 if (!serial) {
1297 dbg("%s", "Serial Paranoia failed");
1298 return;
1299 }
1300
1301 mos7840_port = mos7840_get_port_private(port);
1302
1303 if (mos7840_port == NULL)
1304 return;
1305
1306 if (serial->dev)
1307 /* flush and block until tx is empty */
1308 mos7840_block_until_chase_response(tty, mos7840_port);
1309
1310 if (break_state == -1)
1311 data = mos7840_port->shadowLCR | LCR_SET_BREAK;
1312 else
1313 data = mos7840_port->shadowLCR & ~LCR_SET_BREAK;
1314
1315 /* FIXME: no locking on shadowLCR anywhere in driver */
1316 mos7840_port->shadowLCR = data;
1317 dbg("mcs7840_break mos7840_port->shadowLCR is %x",
1318 mos7840_port->shadowLCR);
1319 mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER,
1320 mos7840_port->shadowLCR);
1321
1322 return;
1323 }
1324
1325 /*****************************************************************************
1326 * mos7840_write_room
1327 * this function is called by the tty driver when it wants to know how many
1328 * bytes of data we can accept for a specific port.
1329 * If successful, we return the amount of room that we have for this port
1330 * Otherwise we return a negative error number.
1331 *****************************************************************************/
1332
1333 static int mos7840_write_room(struct tty_struct *tty)
1334 {
1335 struct usb_serial_port *port = tty->driver_data;
1336 int i;
1337 int room = 0;
1338 unsigned long flags;
1339 struct moschip_port *mos7840_port;
1340
1341 dbg("%s", " mos7840_write_room:entering ...........");
1342
1343 if (mos7840_port_paranoia_check(port, __func__)) {
1344 dbg("%s", "Invalid port");
1345 dbg("%s", " mos7840_write_room:leaving ...........");
1346 return -1;
1347 }
1348
1349 mos7840_port = mos7840_get_port_private(port);
1350 if (mos7840_port == NULL) {
1351 dbg("%s", "mos7840_break:leaving ...........");
1352 return -1;
1353 }
1354
1355 spin_lock_irqsave(&mos7840_port->pool_lock, flags);
1356 for (i = 0; i < NUM_URBS; ++i) {
1357 if (!mos7840_port->busy[i])
1358 room += URB_TRANSFER_BUFFER_SIZE;
1359 }
1360 spin_unlock_irqrestore(&mos7840_port->pool_lock, flags);
1361
1362 room = (room == 0) ? 0 : room - URB_TRANSFER_BUFFER_SIZE + 1;
1363 dbg("%s - returns %d", __func__, room);
1364 return room;
1365
1366 }
1367
1368 /*****************************************************************************
1369 * mos7840_write
1370 * this function is called by the tty driver when data should be written to
1371 * the port.
1372 * If successful, we return the number of bytes written, otherwise we
1373 * return a negative error number.
1374 *****************************************************************************/
1375
1376 static int mos7840_write(struct tty_struct *tty, struct usb_serial_port *port,
1377 const unsigned char *data, int count)
1378 {
1379 int status;
1380 int i;
1381 int bytes_sent = 0;
1382 int transfer_size;
1383 unsigned long flags;
1384
1385 struct moschip_port *mos7840_port;
1386 struct usb_serial *serial;
1387 struct urb *urb;
1388 /* __u16 Data; */
1389 const unsigned char *current_position = data;
1390 unsigned char *data1;
1391 dbg("%s", "entering ...........");
1392 /* dbg("mos7840_write: mos7840_port->shadowLCR is %x",
1393 mos7840_port->shadowLCR); */
1394
1395 #ifdef NOTMOS7840
1396 Data = 0x00;
1397 status = mos7840_get_uart_reg(port, LINE_CONTROL_REGISTER, &Data);
1398 mos7840_port->shadowLCR = Data;
1399 dbg("mos7840_write: LINE_CONTROL_REGISTER is %x", Data);
1400 dbg("mos7840_write: mos7840_port->shadowLCR is %x",
1401 mos7840_port->shadowLCR);
1402
1403 /* Data = 0x03; */
1404 /* status = mos7840_set_uart_reg(port,LINE_CONTROL_REGISTER,Data); */
1405 /* mos7840_port->shadowLCR=Data;//Need to add later */
1406
1407 Data |= SERIAL_LCR_DLAB; /* data latch enable in LCR 0x80 */
1408 status = mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data);
1409
1410 /* Data = 0x0c; */
1411 /* status = mos7840_set_uart_reg(port,DIVISOR_LATCH_LSB,Data); */
1412 Data = 0x00;
1413 status = mos7840_get_uart_reg(port, DIVISOR_LATCH_LSB, &Data);
1414 dbg("mos7840_write:DLL value is %x", Data);
1415
1416 Data = 0x0;
1417 status = mos7840_get_uart_reg(port, DIVISOR_LATCH_MSB, &Data);
1418 dbg("mos7840_write:DLM value is %x", Data);
1419
1420 Data = Data & ~SERIAL_LCR_DLAB;
1421 dbg("mos7840_write: mos7840_port->shadowLCR is %x",
1422 mos7840_port->shadowLCR);
1423 status = mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data);
1424 #endif
1425
1426 if (mos7840_port_paranoia_check(port, __func__)) {
1427 dbg("%s", "Port Paranoia failed");
1428 return -1;
1429 }
1430
1431 serial = port->serial;
1432 if (mos7840_serial_paranoia_check(serial, __func__)) {
1433 dbg("%s", "Serial Paranoia failed");
1434 return -1;
1435 }
1436
1437 mos7840_port = mos7840_get_port_private(port);
1438 if (mos7840_port == NULL) {
1439 dbg("%s", "mos7840_port is NULL");
1440 return -1;
1441 }
1442
1443 /* try to find a free urb in the list */
1444 urb = NULL;
1445
1446 spin_lock_irqsave(&mos7840_port->pool_lock, flags);
1447 for (i = 0; i < NUM_URBS; ++i) {
1448 if (!mos7840_port->busy[i]) {
1449 mos7840_port->busy[i] = 1;
1450 urb = mos7840_port->write_urb_pool[i];
1451 dbg("URB:%d", i);
1452 break;
1453 }
1454 }
1455 spin_unlock_irqrestore(&mos7840_port->pool_lock, flags);
1456
1457 if (urb == NULL) {
1458 dbg("%s - no more free urbs", __func__);
1459 goto exit;
1460 }
1461
1462 if (urb->transfer_buffer == NULL) {
1463 urb->transfer_buffer =
1464 kmalloc(URB_TRANSFER_BUFFER_SIZE, GFP_KERNEL);
1465
1466 if (urb->transfer_buffer == NULL) {
1467 dev_err(&port->dev, "%s no more kernel memory...\n",
1468 __func__);
1469 goto exit;
1470 }
1471 }
1472 transfer_size = min(count, URB_TRANSFER_BUFFER_SIZE);
1473
1474 memcpy(urb->transfer_buffer, current_position, transfer_size);
1475
1476 /* fill urb with data and submit */
1477 usb_fill_bulk_urb(urb,
1478 serial->dev,
1479 usb_sndbulkpipe(serial->dev,
1480 port->bulk_out_endpointAddress),
1481 urb->transfer_buffer,
1482 transfer_size,
1483 mos7840_bulk_out_data_callback, mos7840_port);
1484
1485 data1 = urb->transfer_buffer;
1486 dbg("bulkout endpoint is %d", port->bulk_out_endpointAddress);
1487
1488 /* send it down the pipe */
1489 status = usb_submit_urb(urb, GFP_ATOMIC);
1490
1491 if (status) {
1492 mos7840_port->busy[i] = 0;
1493 dev_err(&port->dev, "%s - usb_submit_urb(write bulk) failed "
1494 "with status = %d\n", __func__, status);
1495 bytes_sent = status;
1496 goto exit;
1497 }
1498 bytes_sent = transfer_size;
1499 mos7840_port->icount.tx += transfer_size;
1500 smp_wmb();
1501 dbg("mos7840_port->icount.tx is %d:", mos7840_port->icount.tx);
1502 exit:
1503 return bytes_sent;
1504
1505 }
1506
1507 /*****************************************************************************
1508 * mos7840_throttle
1509 * this function is called by the tty driver when it wants to stop the data
1510 * being read from the port.
1511 *****************************************************************************/
1512
1513 static void mos7840_throttle(struct tty_struct *tty)
1514 {
1515 struct usb_serial_port *port = tty->driver_data;
1516 struct moschip_port *mos7840_port;
1517 int status;
1518
1519 if (mos7840_port_paranoia_check(port, __func__)) {
1520 dbg("%s", "Invalid port");
1521 return;
1522 }
1523
1524 dbg("- port %d", port->number);
1525
1526 mos7840_port = mos7840_get_port_private(port);
1527
1528 if (mos7840_port == NULL)
1529 return;
1530
1531 if (!mos7840_port->open) {
1532 dbg("%s", "port not opened");
1533 return;
1534 }
1535
1536 dbg("%s", "Entering ..........");
1537
1538 /* if we are implementing XON/XOFF, send the stop character */
1539 if (I_IXOFF(tty)) {
1540 unsigned char stop_char = STOP_CHAR(tty);
1541 status = mos7840_write(tty, port, &stop_char, 1);
1542 if (status <= 0)
1543 return;
1544 }
1545 /* if we are implementing RTS/CTS, toggle that line */
1546 if (tty->termios->c_cflag & CRTSCTS) {
1547 mos7840_port->shadowMCR &= ~MCR_RTS;
1548 status = mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER,
1549 mos7840_port->shadowMCR);
1550 if (status < 0)
1551 return;
1552 }
1553
1554 return;
1555 }
1556
1557 /*****************************************************************************
1558 * mos7840_unthrottle
1559 * this function is called by the tty driver when it wants to resume
1560 * the data being read from the port (called after mos7840_throttle is
1561 * called)
1562 *****************************************************************************/
1563 static void mos7840_unthrottle(struct tty_struct *tty)
1564 {
1565 struct usb_serial_port *port = tty->driver_data;
1566 int status;
1567 struct moschip_port *mos7840_port = mos7840_get_port_private(port);
1568
1569 if (mos7840_port_paranoia_check(port, __func__)) {
1570 dbg("%s", "Invalid port");
1571 return;
1572 }
1573
1574 if (mos7840_port == NULL)
1575 return;
1576
1577 if (!mos7840_port->open) {
1578 dbg("%s - port not opened", __func__);
1579 return;
1580 }
1581
1582 dbg("%s", "Entering ..........");
1583
1584 /* if we are implementing XON/XOFF, send the start character */
1585 if (I_IXOFF(tty)) {
1586 unsigned char start_char = START_CHAR(tty);
1587 status = mos7840_write(tty, port, &start_char, 1);
1588 if (status <= 0)
1589 return;
1590 }
1591
1592 /* if we are implementing RTS/CTS, toggle that line */
1593 if (tty->termios->c_cflag & CRTSCTS) {
1594 mos7840_port->shadowMCR |= MCR_RTS;
1595 status = mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER,
1596 mos7840_port->shadowMCR);
1597 if (status < 0)
1598 return;
1599 }
1600 }
1601
1602 static int mos7840_tiocmget(struct tty_struct *tty, struct file *file)
1603 {
1604 struct usb_serial_port *port = tty->driver_data;
1605 struct moschip_port *mos7840_port;
1606 unsigned int result;
1607 __u16 msr;
1608 __u16 mcr;
1609 int status;
1610 mos7840_port = mos7840_get_port_private(port);
1611
1612 dbg("%s - port %d", __func__, port->number);
1613
1614 if (mos7840_port == NULL)
1615 return -ENODEV;
1616
1617 status = mos7840_get_uart_reg(port, MODEM_STATUS_REGISTER, &msr);
1618 status = mos7840_get_uart_reg(port, MODEM_CONTROL_REGISTER, &mcr);
1619 result = ((mcr & MCR_DTR) ? TIOCM_DTR : 0)
1620 | ((mcr & MCR_RTS) ? TIOCM_RTS : 0)
1621 | ((mcr & MCR_LOOPBACK) ? TIOCM_LOOP : 0)
1622 | ((msr & MOS7840_MSR_CTS) ? TIOCM_CTS : 0)
1623 | ((msr & MOS7840_MSR_CD) ? TIOCM_CAR : 0)
1624 | ((msr & MOS7840_MSR_RI) ? TIOCM_RI : 0)
1625 | ((msr & MOS7840_MSR_DSR) ? TIOCM_DSR : 0);
1626
1627 dbg("%s - 0x%04X", __func__, result);
1628
1629 return result;
1630 }
1631
1632 static int mos7840_tiocmset(struct tty_struct *tty, struct file *file,
1633 unsigned int set, unsigned int clear)
1634 {
1635 struct usb_serial_port *port = tty->driver_data;
1636 struct moschip_port *mos7840_port;
1637 unsigned int mcr;
1638 int status;
1639
1640 dbg("%s - port %d", __func__, port->number);
1641
1642 mos7840_port = mos7840_get_port_private(port);
1643
1644 if (mos7840_port == NULL)
1645 return -ENODEV;
1646
1647 /* FIXME: What locks the port registers ? */
1648 mcr = mos7840_port->shadowMCR;
1649 if (clear & TIOCM_RTS)
1650 mcr &= ~MCR_RTS;
1651 if (clear & TIOCM_DTR)
1652 mcr &= ~MCR_DTR;
1653 if (clear & TIOCM_LOOP)
1654 mcr &= ~MCR_LOOPBACK;
1655
1656 if (set & TIOCM_RTS)
1657 mcr |= MCR_RTS;
1658 if (set & TIOCM_DTR)
1659 mcr |= MCR_DTR;
1660 if (set & TIOCM_LOOP)
1661 mcr |= MCR_LOOPBACK;
1662
1663 mos7840_port->shadowMCR = mcr;
1664
1665 status = mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER, mcr);
1666 if (status < 0) {
1667 dbg("setting MODEM_CONTROL_REGISTER Failed");
1668 return status;
1669 }
1670
1671 return 0;
1672 }
1673
1674 /*****************************************************************************
1675 * mos7840_calc_baud_rate_divisor
1676 * this function calculates the proper baud rate divisor for the specified
1677 * baud rate.
1678 *****************************************************************************/
1679 static int mos7840_calc_baud_rate_divisor(int baudRate, int *divisor,
1680 __u16 *clk_sel_val)
1681 {
1682
1683 dbg("%s - %d", __func__, baudRate);
1684
1685 if (baudRate <= 115200) {
1686 *divisor = 115200 / baudRate;
1687 *clk_sel_val = 0x0;
1688 }
1689 if ((baudRate > 115200) && (baudRate <= 230400)) {
1690 *divisor = 230400 / baudRate;
1691 *clk_sel_val = 0x10;
1692 } else if ((baudRate > 230400) && (baudRate <= 403200)) {
1693 *divisor = 403200 / baudRate;
1694 *clk_sel_val = 0x20;
1695 } else if ((baudRate > 403200) && (baudRate <= 460800)) {
1696 *divisor = 460800 / baudRate;
1697 *clk_sel_val = 0x30;
1698 } else if ((baudRate > 460800) && (baudRate <= 806400)) {
1699 *divisor = 806400 / baudRate;
1700 *clk_sel_val = 0x40;
1701 } else if ((baudRate > 806400) && (baudRate <= 921600)) {
1702 *divisor = 921600 / baudRate;
1703 *clk_sel_val = 0x50;
1704 } else if ((baudRate > 921600) && (baudRate <= 1572864)) {
1705 *divisor = 1572864 / baudRate;
1706 *clk_sel_val = 0x60;
1707 } else if ((baudRate > 1572864) && (baudRate <= 3145728)) {
1708 *divisor = 3145728 / baudRate;
1709 *clk_sel_val = 0x70;
1710 }
1711 return 0;
1712
1713 #ifdef NOTMCS7840
1714
1715 for (i = 0; i < ARRAY_SIZE(mos7840_divisor_table); i++) {
1716 if (mos7840_divisor_table[i].BaudRate == baudrate) {
1717 *divisor = mos7840_divisor_table[i].Divisor;
1718 return 0;
1719 }
1720 }
1721
1722 /* After trying for all the standard baud rates *
1723 * Try calculating the divisor for this baud rate */
1724
1725 if (baudrate > 75 && baudrate < 230400) {
1726 /* get the divisor */
1727 custom = (__u16) (230400L / baudrate);
1728
1729 /* Check for round off */
1730 round1 = (__u16) (2304000L / baudrate);
1731 round = (__u16) (round1 - (custom * 10));
1732 if (round > 4)
1733 custom++;
1734 *divisor = custom;
1735
1736 dbg(" Baud %d = %d", baudrate, custom);
1737 return 0;
1738 }
1739
1740 dbg("%s", " Baud calculation Failed...");
1741 return -1;
1742 #endif
1743 }
1744
1745 /*****************************************************************************
1746 * mos7840_send_cmd_write_baud_rate
1747 * this function sends the proper command to change the baud rate of the
1748 * specified port.
1749 *****************************************************************************/
1750
1751 static int mos7840_send_cmd_write_baud_rate(struct moschip_port *mos7840_port,
1752 int baudRate)
1753 {
1754 int divisor = 0;
1755 int status;
1756 __u16 Data;
1757 unsigned char number;
1758 __u16 clk_sel_val;
1759 struct usb_serial_port *port;
1760
1761 if (mos7840_port == NULL)
1762 return -1;
1763
1764 port = (struct usb_serial_port *)mos7840_port->port;
1765 if (mos7840_port_paranoia_check(port, __func__)) {
1766 dbg("%s", "Invalid port");
1767 return -1;
1768 }
1769
1770 if (mos7840_serial_paranoia_check(port->serial, __func__)) {
1771 dbg("%s", "Invalid Serial");
1772 return -1;
1773 }
1774
1775 dbg("%s", "Entering ..........");
1776
1777 number = mos7840_port->port->number - mos7840_port->port->serial->minor;
1778
1779 dbg("%s - port = %d, baud = %d", __func__,
1780 mos7840_port->port->number, baudRate);
1781 /* reset clk_uart_sel in spregOffset */
1782 if (baudRate > 115200) {
1783 #ifdef HW_flow_control
1784 /* NOTE: need to see the pther register to modify */
1785 /* setting h/w flow control bit to 1 */
1786 Data = 0x2b;
1787 mos7840_port->shadowMCR = Data;
1788 status = mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER,
1789 Data);
1790 if (status < 0) {
1791 dbg("Writing spreg failed in set_serial_baud");
1792 return -1;
1793 }
1794 #endif
1795
1796 } else {
1797 #ifdef HW_flow_control
1798 / *setting h/w flow control bit to 0 */
1799 Data = 0xb;
1800 mos7840_port->shadowMCR = Data;
1801 status = mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER,
1802 Data);
1803 if (status < 0) {
1804 dbg("Writing spreg failed in set_serial_baud");
1805 return -1;
1806 }
1807 #endif
1808
1809 }
1810
1811 if (1) { /* baudRate <= 115200) */
1812 clk_sel_val = 0x0;
1813 Data = 0x0;
1814 status = mos7840_calc_baud_rate_divisor(baudRate, &divisor,
1815 &clk_sel_val);
1816 status = mos7840_get_reg_sync(port, mos7840_port->SpRegOffset,
1817 &Data);
1818 if (status < 0) {
1819 dbg("reading spreg failed in set_serial_baud");
1820 return -1;
1821 }
1822 Data = (Data & 0x8f) | clk_sel_val;
1823 status = mos7840_set_reg_sync(port, mos7840_port->SpRegOffset,
1824 Data);
1825 if (status < 0) {
1826 dbg("Writing spreg failed in set_serial_baud");
1827 return -1;
1828 }
1829 /* Calculate the Divisor */
1830
1831 if (status) {
1832 dev_err(&port->dev, "%s - bad baud rate\n", __func__);
1833 return status;
1834 }
1835 /* Enable access to divisor latch */
1836 Data = mos7840_port->shadowLCR | SERIAL_LCR_DLAB;
1837 mos7840_port->shadowLCR = Data;
1838 mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data);
1839
1840 /* Write the divisor */
1841 Data = (unsigned char)(divisor & 0xff);
1842 dbg("set_serial_baud Value to write DLL is %x", Data);
1843 mos7840_set_uart_reg(port, DIVISOR_LATCH_LSB, Data);
1844
1845 Data = (unsigned char)((divisor & 0xff00) >> 8);
1846 dbg("set_serial_baud Value to write DLM is %x", Data);
1847 mos7840_set_uart_reg(port, DIVISOR_LATCH_MSB, Data);
1848
1849 /* Disable access to divisor latch */
1850 Data = mos7840_port->shadowLCR & ~SERIAL_LCR_DLAB;
1851 mos7840_port->shadowLCR = Data;
1852 mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data);
1853
1854 }
1855 return status;
1856 }
1857
1858 /*****************************************************************************
1859 * mos7840_change_port_settings
1860 * This routine is called to set the UART on the device to match
1861 * the specified new settings.
1862 *****************************************************************************/
1863
1864 static void mos7840_change_port_settings(struct tty_struct *tty,
1865 struct moschip_port *mos7840_port, struct ktermios *old_termios)
1866 {
1867 int baud;
1868 unsigned cflag;
1869 unsigned iflag;
1870 __u8 lData;
1871 __u8 lParity;
1872 __u8 lStop;
1873 int status;
1874 __u16 Data;
1875 struct usb_serial_port *port;
1876 struct usb_serial *serial;
1877
1878 if (mos7840_port == NULL)
1879 return;
1880
1881 port = (struct usb_serial_port *)mos7840_port->port;
1882
1883 if (mos7840_port_paranoia_check(port, __func__)) {
1884 dbg("%s", "Invalid port");
1885 return;
1886 }
1887
1888 if (mos7840_serial_paranoia_check(port->serial, __func__)) {
1889 dbg("%s", "Invalid Serial");
1890 return;
1891 }
1892
1893 serial = port->serial;
1894
1895 dbg("%s - port %d", __func__, mos7840_port->port->number);
1896
1897 if (!mos7840_port->open) {
1898 dbg("%s - port not opened", __func__);
1899 return;
1900 }
1901
1902 dbg("%s", "Entering ..........");
1903
1904 lData = LCR_BITS_8;
1905 lStop = LCR_STOP_1;
1906 lParity = LCR_PAR_NONE;
1907
1908 cflag = tty->termios->c_cflag;
1909 iflag = tty->termios->c_iflag;
1910
1911 /* Change the number of bits */
1912 if (cflag & CSIZE) {
1913 switch (cflag & CSIZE) {
1914 case CS5:
1915 lData = LCR_BITS_5;
1916 break;
1917
1918 case CS6:
1919 lData = LCR_BITS_6;
1920 break;
1921
1922 case CS7:
1923 lData = LCR_BITS_7;
1924 break;
1925 default:
1926 case CS8:
1927 lData = LCR_BITS_8;
1928 break;
1929 }
1930 }
1931 /* Change the Parity bit */
1932 if (cflag & PARENB) {
1933 if (cflag & PARODD) {
1934 lParity = LCR_PAR_ODD;
1935 dbg("%s - parity = odd", __func__);
1936 } else {
1937 lParity = LCR_PAR_EVEN;
1938 dbg("%s - parity = even", __func__);
1939 }
1940
1941 } else {
1942 dbg("%s - parity = none", __func__);
1943 }
1944
1945 if (cflag & CMSPAR)
1946 lParity = lParity | 0x20;
1947
1948 /* Change the Stop bit */
1949 if (cflag & CSTOPB) {
1950 lStop = LCR_STOP_2;
1951 dbg("%s - stop bits = 2", __func__);
1952 } else {
1953 lStop = LCR_STOP_1;
1954 dbg("%s - stop bits = 1", __func__);
1955 }
1956
1957 /* Update the LCR with the correct value */
1958 mos7840_port->shadowLCR &=
1959 ~(LCR_BITS_MASK | LCR_STOP_MASK | LCR_PAR_MASK);
1960 mos7840_port->shadowLCR |= (lData | lParity | lStop);
1961
1962 dbg("mos7840_change_port_settings mos7840_port->shadowLCR is %x",
1963 mos7840_port->shadowLCR);
1964 /* Disable Interrupts */
1965 Data = 0x00;
1966 mos7840_set_uart_reg(port, INTERRUPT_ENABLE_REGISTER, Data);
1967
1968 Data = 0x00;
1969 mos7840_set_uart_reg(port, FIFO_CONTROL_REGISTER, Data);
1970
1971 Data = 0xcf;
1972 mos7840_set_uart_reg(port, FIFO_CONTROL_REGISTER, Data);
1973
1974 /* Send the updated LCR value to the mos7840 */
1975 Data = mos7840_port->shadowLCR;
1976
1977 mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data);
1978
1979 Data = 0x00b;
1980 mos7840_port->shadowMCR = Data;
1981 mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER, Data);
1982 Data = 0x00b;
1983 mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER, Data);
1984
1985 /* set up the MCR register and send it to the mos7840 */
1986
1987 mos7840_port->shadowMCR = MCR_MASTER_IE;
1988 if (cflag & CBAUD)
1989 mos7840_port->shadowMCR |= (MCR_DTR | MCR_RTS);
1990
1991 if (cflag & CRTSCTS)
1992 mos7840_port->shadowMCR |= (MCR_XON_ANY);
1993 else
1994 mos7840_port->shadowMCR &= ~(MCR_XON_ANY);
1995
1996 Data = mos7840_port->shadowMCR;
1997 mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER, Data);
1998
1999 /* Determine divisor based on baud rate */
2000 baud = tty_get_baud_rate(tty);
2001
2002 if (!baud) {
2003 /* pick a default, any default... */
2004 dbg("%s", "Picked default baud...");
2005 baud = 9600;
2006 }
2007
2008 dbg("%s - baud rate = %d", __func__, baud);
2009 status = mos7840_send_cmd_write_baud_rate(mos7840_port, baud);
2010
2011 /* Enable Interrupts */
2012 Data = 0x0c;
2013 mos7840_set_uart_reg(port, INTERRUPT_ENABLE_REGISTER, Data);
2014
2015 if (mos7840_port->read_urb_busy == false) {
2016 mos7840_port->read_urb->dev = serial->dev;
2017 mos7840_port->read_urb_busy = true;
2018 status = usb_submit_urb(mos7840_port->read_urb, GFP_ATOMIC);
2019 if (status) {
2020 dbg("usb_submit_urb(read bulk) failed, status = %d",
2021 status);
2022 mos7840_port->read_urb_busy = false;
2023 }
2024 }
2025 wake_up(&mos7840_port->delta_msr_wait);
2026 mos7840_port->delta_msr_cond = 1;
2027 dbg("mos7840_change_port_settings mos7840_port->shadowLCR is End %x",
2028 mos7840_port->shadowLCR);
2029
2030 return;
2031 }
2032
2033 /*****************************************************************************
2034 * mos7840_set_termios
2035 * this function is called by the tty driver when it wants to change
2036 * the termios structure
2037 *****************************************************************************/
2038
2039 static void mos7840_set_termios(struct tty_struct *tty,
2040 struct usb_serial_port *port,
2041 struct ktermios *old_termios)
2042 {
2043 int status;
2044 unsigned int cflag;
2045 struct usb_serial *serial;
2046 struct moschip_port *mos7840_port;
2047 dbg("mos7840_set_termios: START");
2048 if (mos7840_port_paranoia_check(port, __func__)) {
2049 dbg("%s", "Invalid port");
2050 return;
2051 }
2052
2053 serial = port->serial;
2054
2055 if (mos7840_serial_paranoia_check(serial, __func__)) {
2056 dbg("%s", "Invalid Serial");
2057 return;
2058 }
2059
2060 mos7840_port = mos7840_get_port_private(port);
2061
2062 if (mos7840_port == NULL)
2063 return;
2064
2065 if (!mos7840_port->open) {
2066 dbg("%s - port not opened", __func__);
2067 return;
2068 }
2069
2070 dbg("%s", "setting termios - ");
2071
2072 cflag = tty->termios->c_cflag;
2073
2074 dbg("%s - clfag %08x iflag %08x", __func__,
2075 tty->termios->c_cflag, RELEVANT_IFLAG(tty->termios->c_iflag));
2076 dbg("%s - old clfag %08x old iflag %08x", __func__,
2077 old_termios->c_cflag, RELEVANT_IFLAG(old_termios->c_iflag));
2078 dbg("%s - port %d", __func__, port->number);
2079
2080 /* change the port settings to the new ones specified */
2081
2082 mos7840_change_port_settings(tty, mos7840_port, old_termios);
2083
2084 if (!mos7840_port->read_urb) {
2085 dbg("%s", "URB KILLED !!!!!");
2086 return;
2087 }
2088
2089 if (mos7840_port->read_urb_busy == false) {
2090 mos7840_port->read_urb->dev = serial->dev;
2091 mos7840_port->read_urb_busy = true;
2092 status = usb_submit_urb(mos7840_port->read_urb, GFP_ATOMIC);
2093 if (status) {
2094 dbg("usb_submit_urb(read bulk) failed, status = %d",
2095 status);
2096 mos7840_port->read_urb_busy = false;
2097 }
2098 }
2099 return;
2100 }
2101
2102 /*****************************************************************************
2103 * mos7840_get_lsr_info - get line status register info
2104 *
2105 * Purpose: Let user call ioctl() to get info when the UART physically
2106 * is emptied. On bus types like RS485, the transmitter must
2107 * release the bus after transmitting. This must be done when
2108 * the transmit shift register is empty, not be done when the
2109 * transmit holding register is empty. This functionality
2110 * allows an RS485 driver to be written in user space.
2111 *****************************************************************************/
2112
2113 static int mos7840_get_lsr_info(struct tty_struct *tty,
2114 unsigned int __user *value)
2115 {
2116 int count;
2117 unsigned int result = 0;
2118
2119 count = mos7840_chars_in_buffer(tty);
2120 if (count == 0) {
2121 dbg("%s -- Empty", __func__);
2122 result = TIOCSER_TEMT;
2123 }
2124
2125 if (copy_to_user(value, &result, sizeof(int)))
2126 return -EFAULT;
2127 return 0;
2128 }
2129
2130 /*****************************************************************************
2131 * mos7840_set_modem_info
2132 * function to set modem info
2133 *****************************************************************************/
2134
2135 /* FIXME: Should be using the model control hooks */
2136
2137 static int mos7840_set_modem_info(struct moschip_port *mos7840_port,
2138 unsigned int cmd, unsigned int __user *value)
2139 {
2140 unsigned int mcr;
2141 unsigned int arg;
2142 __u16 Data;
2143 int status;
2144 struct usb_serial_port *port;
2145
2146 if (mos7840_port == NULL)
2147 return -1;
2148
2149 port = (struct usb_serial_port *)mos7840_port->port;
2150 if (mos7840_port_paranoia_check(port, __func__)) {
2151 dbg("%s", "Invalid port");
2152 return -1;
2153 }
2154
2155 mcr = mos7840_port->shadowMCR;
2156
2157 if (copy_from_user(&arg, value, sizeof(int)))
2158 return -EFAULT;
2159
2160 switch (cmd) {
2161 case TIOCMBIS:
2162 if (arg & TIOCM_RTS)
2163 mcr |= MCR_RTS;
2164 if (arg & TIOCM_DTR)
2165 mcr |= MCR_RTS;
2166 if (arg & TIOCM_LOOP)
2167 mcr |= MCR_LOOPBACK;
2168 break;
2169
2170 case TIOCMBIC:
2171 if (arg & TIOCM_RTS)
2172 mcr &= ~MCR_RTS;
2173 if (arg & TIOCM_DTR)
2174 mcr &= ~MCR_RTS;
2175 if (arg & TIOCM_LOOP)
2176 mcr &= ~MCR_LOOPBACK;
2177 break;
2178
2179 case TIOCMSET:
2180 /* turn off the RTS and DTR and LOOPBACK
2181 * and then only turn on what was asked to */
2182 mcr &= ~(MCR_RTS | MCR_DTR | MCR_LOOPBACK);
2183 mcr |= ((arg & TIOCM_RTS) ? MCR_RTS : 0);
2184 mcr |= ((arg & TIOCM_DTR) ? MCR_DTR : 0);
2185 mcr |= ((arg & TIOCM_LOOP) ? MCR_LOOPBACK : 0);
2186 break;
2187 }
2188
2189 lock_kernel();
2190 mos7840_port->shadowMCR = mcr;
2191
2192 Data = mos7840_port->shadowMCR;
2193 status = mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER, Data);
2194 unlock_kernel();
2195 if (status < 0) {
2196 dbg("setting MODEM_CONTROL_REGISTER Failed");
2197 return -1;
2198 }
2199
2200 return 0;
2201 }
2202
2203 /*****************************************************************************
2204 * mos7840_get_modem_info
2205 * function to get modem info
2206 *****************************************************************************/
2207
2208 static int mos7840_get_modem_info(struct moschip_port *mos7840_port,
2209 unsigned int __user *value)
2210 {
2211 unsigned int result = 0;
2212 __u16 msr;
2213 unsigned int mcr = mos7840_port->shadowMCR;
2214 mos7840_get_uart_reg(mos7840_port->port,
2215 MODEM_STATUS_REGISTER, &msr);
2216 result = ((mcr & MCR_DTR) ? TIOCM_DTR : 0) /* 0x002 */
2217 |((mcr & MCR_RTS) ? TIOCM_RTS : 0) /* 0x004 */
2218 |((msr & MOS7840_MSR_CTS) ? TIOCM_CTS : 0) /* 0x020 */
2219 |((msr & MOS7840_MSR_CD) ? TIOCM_CAR : 0) /* 0x040 */
2220 |((msr & MOS7840_MSR_RI) ? TIOCM_RI : 0) /* 0x080 */
2221 |((msr & MOS7840_MSR_DSR) ? TIOCM_DSR : 0); /* 0x100 */
2222
2223 dbg("%s -- %x", __func__, result);
2224
2225 if (copy_to_user(value, &result, sizeof(int)))
2226 return -EFAULT;
2227 return 0;
2228 }
2229
2230 /*****************************************************************************
2231 * mos7840_get_serial_info
2232 * function to get information about serial port
2233 *****************************************************************************/
2234
2235 static int mos7840_get_serial_info(struct moschip_port *mos7840_port,
2236 struct serial_struct __user *retinfo)
2237 {
2238 struct serial_struct tmp;
2239
2240 if (mos7840_port == NULL)
2241 return -1;
2242
2243 if (!retinfo)
2244 return -EFAULT;
2245
2246 memset(&tmp, 0, sizeof(tmp));
2247
2248 tmp.type = PORT_16550A;
2249 tmp.line = mos7840_port->port->serial->minor;
2250 tmp.port = mos7840_port->port->number;
2251 tmp.irq = 0;
2252 tmp.flags = ASYNC_SKIP_TEST | ASYNC_AUTO_IRQ;
2253 tmp.xmit_fifo_size = NUM_URBS * URB_TRANSFER_BUFFER_SIZE;
2254 tmp.baud_base = 9600;
2255 tmp.close_delay = 5 * HZ;
2256 tmp.closing_wait = 30 * HZ;
2257
2258 if (copy_to_user(retinfo, &tmp, sizeof(*retinfo)))
2259 return -EFAULT;
2260 return 0;
2261 }
2262
2263 /*****************************************************************************
2264 * SerialIoctl
2265 * this function handles any ioctl calls to the driver
2266 *****************************************************************************/
2267
2268 static int mos7840_ioctl(struct tty_struct *tty, struct file *file,
2269 unsigned int cmd, unsigned long arg)
2270 {
2271 struct usb_serial_port *port = tty->driver_data;
2272 void __user *argp = (void __user *)arg;
2273 struct moschip_port *mos7840_port;
2274
2275 struct async_icount cnow;
2276 struct async_icount cprev;
2277 struct serial_icounter_struct icount;
2278 int mosret = 0;
2279
2280 if (mos7840_port_paranoia_check(port, __func__)) {
2281 dbg("%s", "Invalid port");
2282 return -1;
2283 }
2284
2285 mos7840_port = mos7840_get_port_private(port);
2286
2287 if (mos7840_port == NULL)
2288 return -1;
2289
2290 dbg("%s - port %d, cmd = 0x%x", __func__, port->number, cmd);
2291
2292 switch (cmd) {
2293 /* return number of bytes available */
2294
2295 case TIOCSERGETLSR:
2296 dbg("%s (%d) TIOCSERGETLSR", __func__, port->number);
2297 return mos7840_get_lsr_info(tty, argp);
2298 return 0;
2299
2300 /* FIXME: use the modem hooks and remove this */
2301 case TIOCMBIS:
2302 case TIOCMBIC:
2303 case TIOCMSET:
2304 dbg("%s (%d) TIOCMSET/TIOCMBIC/TIOCMSET", __func__,
2305 port->number);
2306 mosret =
2307 mos7840_set_modem_info(mos7840_port, cmd, argp);
2308 return mosret;
2309
2310 case TIOCMGET:
2311 dbg("%s (%d) TIOCMGET", __func__, port->number);
2312 return mos7840_get_modem_info(mos7840_port, argp);
2313
2314 case TIOCGSERIAL:
2315 dbg("%s (%d) TIOCGSERIAL", __func__, port->number);
2316 return mos7840_get_serial_info(mos7840_port, argp);
2317
2318 case TIOCSSERIAL:
2319 dbg("%s (%d) TIOCSSERIAL", __func__, port->number);
2320 break;
2321
2322 case TIOCMIWAIT:
2323 dbg("%s (%d) TIOCMIWAIT", __func__, port->number);
2324 cprev = mos7840_port->icount;
2325 while (1) {
2326 /* interruptible_sleep_on(&mos7840_port->delta_msr_wait); */
2327 mos7840_port->delta_msr_cond = 0;
2328 wait_event_interruptible(mos7840_port->delta_msr_wait,
2329 (mos7840_port->
2330 delta_msr_cond == 1));
2331
2332 /* see if a signal did it */
2333 if (signal_pending(current))
2334 return -ERESTARTSYS;
2335 cnow = mos7840_port->icount;
2336 smp_rmb();
2337 if (cnow.rng == cprev.rng && cnow.dsr == cprev.dsr &&
2338 cnow.dcd == cprev.dcd && cnow.cts == cprev.cts)
2339 return -EIO; /* no change => error */
2340 if (((arg & TIOCM_RNG) && (cnow.rng != cprev.rng)) ||
2341 ((arg & TIOCM_DSR) && (cnow.dsr != cprev.dsr)) ||
2342 ((arg & TIOCM_CD) && (cnow.dcd != cprev.dcd)) ||
2343 ((arg & TIOCM_CTS) && (cnow.cts != cprev.cts))) {
2344 return 0;
2345 }
2346 cprev = cnow;
2347 }
2348 /* NOTREACHED */
2349 break;
2350
2351 case TIOCGICOUNT:
2352 cnow = mos7840_port->icount;
2353 smp_rmb();
2354 icount.cts = cnow.cts;
2355 icount.dsr = cnow.dsr;
2356 icount.rng = cnow.rng;
2357 icount.dcd = cnow.dcd;
2358 icount.rx = cnow.rx;
2359 icount.tx = cnow.tx;
2360 icount.frame = cnow.frame;
2361 icount.overrun = cnow.overrun;
2362 icount.parity = cnow.parity;
2363 icount.brk = cnow.brk;
2364 icount.buf_overrun = cnow.buf_overrun;
2365
2366 dbg("%s (%d) TIOCGICOUNT RX=%d, TX=%d", __func__,
2367 port->number, icount.rx, icount.tx);
2368 if (copy_to_user(argp, &icount, sizeof(icount)))
2369 return -EFAULT;
2370 return 0;
2371 default:
2372 break;
2373 }
2374 return -ENOIOCTLCMD;
2375 }
2376
2377 static int mos7840_calc_num_ports(struct usb_serial *serial)
2378 {
2379 int mos7840_num_ports = 0;
2380
2381 dbg("numberofendpoints: cur %d, alt %d",
2382 (int)serial->interface->cur_altsetting->desc.bNumEndpoints,
2383 (int)serial->interface->altsetting->desc.bNumEndpoints);
2384 if (serial->interface->cur_altsetting->desc.bNumEndpoints == 5) {
2385 mos7840_num_ports = serial->num_ports = 2;
2386 } else if (serial->interface->cur_altsetting->desc.bNumEndpoints == 9) {
2387 serial->num_bulk_in = 4;
2388 serial->num_bulk_out = 4;
2389 mos7840_num_ports = serial->num_ports = 4;
2390 }
2391 dbg ("mos7840_num_ports = %d", mos7840_num_ports);
2392 return mos7840_num_ports;
2393 }
2394
2395 /****************************************************************************
2396 * mos7840_startup
2397 ****************************************************************************/
2398
2399 static int mos7840_startup(struct usb_serial *serial)
2400 {
2401 struct moschip_port *mos7840_port;
2402 struct usb_device *dev;
2403 int i, status;
2404
2405 __u16 Data;
2406 dbg("%s", "mos7840_startup :Entering..........");
2407
2408 if (!serial) {
2409 dbg("%s", "Invalid Handler");
2410 return -1;
2411 }
2412
2413 dev = serial->dev;
2414
2415 dbg("%s", "Entering...");
2416 dbg ("mos7840_startup: serial = %p", serial);
2417
2418 /* we set up the pointers to the endpoints in the mos7840_open *
2419 * function, as the structures aren't created yet. */
2420
2421 /* set up port private structures */
2422 for (i = 0; i < serial->num_ports; ++i) {
2423 dbg ("mos7840_startup: configuring port %d............", i);
2424 mos7840_port = kzalloc(sizeof(struct moschip_port), GFP_KERNEL);
2425 if (mos7840_port == NULL) {
2426 dev_err(&dev->dev, "%s - Out of memory\n", __func__);
2427 status = -ENOMEM;
2428 i--; /* don't follow NULL pointer cleaning up */
2429 goto error;
2430 }
2431
2432 /* Initialize all port interrupt end point to port 0 int
2433 * endpoint. Our device has only one interrupt end point
2434 * common to all port */
2435
2436 mos7840_port->port = serial->port[i];
2437 mos7840_set_port_private(serial->port[i], mos7840_port);
2438 spin_lock_init(&mos7840_port->pool_lock);
2439
2440 /* minor is not initialised until later by
2441 * usb-serial.c:get_free_serial() and cannot therefore be used
2442 * to index device instances */
2443 mos7840_port->port_num = i + 1;
2444 dbg ("serial->port[i]->number = %d", serial->port[i]->number);
2445 dbg ("serial->port[i]->serial->minor = %d", serial->port[i]->serial->minor);
2446 dbg ("mos7840_port->port_num = %d", mos7840_port->port_num);
2447 dbg ("serial->minor = %d", serial->minor);
2448
2449 if (mos7840_port->port_num == 1) {
2450 mos7840_port->SpRegOffset = 0x0;
2451 mos7840_port->ControlRegOffset = 0x1;
2452 mos7840_port->DcrRegOffset = 0x4;
2453 } else if ((mos7840_port->port_num == 2)
2454 && (serial->num_ports == 4)) {
2455 mos7840_port->SpRegOffset = 0x8;
2456 mos7840_port->ControlRegOffset = 0x9;
2457 mos7840_port->DcrRegOffset = 0x16;
2458 } else if ((mos7840_port->port_num == 2)
2459 && (serial->num_ports == 2)) {
2460 mos7840_port->SpRegOffset = 0xa;
2461 mos7840_port->ControlRegOffset = 0xb;
2462 mos7840_port->DcrRegOffset = 0x19;
2463 } else if ((mos7840_port->port_num == 3)
2464 && (serial->num_ports == 4)) {
2465 mos7840_port->SpRegOffset = 0xa;
2466 mos7840_port->ControlRegOffset = 0xb;
2467 mos7840_port->DcrRegOffset = 0x19;
2468 } else if ((mos7840_port->port_num == 4)
2469 && (serial->num_ports == 4)) {
2470 mos7840_port->SpRegOffset = 0xc;
2471 mos7840_port->ControlRegOffset = 0xd;
2472 mos7840_port->DcrRegOffset = 0x1c;
2473 }
2474 mos7840_dump_serial_port(mos7840_port);
2475 mos7840_set_port_private(serial->port[i], mos7840_port);
2476
2477 /* enable rx_disable bit in control register */
2478 status = mos7840_get_reg_sync(serial->port[i],
2479 mos7840_port->ControlRegOffset, &Data);
2480 if (status < 0) {
2481 dbg("Reading ControlReg failed status-0x%x", status);
2482 break;
2483 } else
2484 dbg("ControlReg Reading success val is %x, status%d",
2485 Data, status);
2486 Data |= 0x08; /* setting driver done bit */
2487 Data |= 0x04; /* sp1_bit to have cts change reflect in
2488 modem status reg */
2489
2490 /* Data |= 0x20; //rx_disable bit */
2491 status = mos7840_set_reg_sync(serial->port[i],
2492 mos7840_port->ControlRegOffset, Data);
2493 if (status < 0) {
2494 dbg("Writing ControlReg failed(rx_disable) status-0x%x", status);
2495 break;
2496 } else
2497 dbg("ControlReg Writing success(rx_disable) status%d",
2498 status);
2499
2500 /* Write default values in DCR (i.e 0x01 in DCR0, 0x05 in DCR2
2501 and 0x24 in DCR3 */
2502 Data = 0x01;
2503 status = mos7840_set_reg_sync(serial->port[i],
2504 (__u16) (mos7840_port->DcrRegOffset + 0), Data);
2505 if (status < 0) {
2506 dbg("Writing DCR0 failed status-0x%x", status);
2507 break;
2508 } else
2509 dbg("DCR0 Writing success status%d", status);
2510
2511 Data = 0x05;
2512 status = mos7840_set_reg_sync(serial->port[i],
2513 (__u16) (mos7840_port->DcrRegOffset + 1), Data);
2514 if (status < 0) {
2515 dbg("Writing DCR1 failed status-0x%x", status);
2516 break;
2517 } else
2518 dbg("DCR1 Writing success status%d", status);
2519
2520 Data = 0x24;
2521 status = mos7840_set_reg_sync(serial->port[i],
2522 (__u16) (mos7840_port->DcrRegOffset + 2), Data);
2523 if (status < 0) {
2524 dbg("Writing DCR2 failed status-0x%x", status);
2525 break;
2526 } else
2527 dbg("DCR2 Writing success status%d", status);
2528
2529 /* write values in clkstart0x0 and clkmulti 0x20 */
2530 Data = 0x0;
2531 status = mos7840_set_reg_sync(serial->port[i],
2532 CLK_START_VALUE_REGISTER, Data);
2533 if (status < 0) {
2534 dbg("Writing CLK_START_VALUE_REGISTER failed status-0x%x", status);
2535 break;
2536 } else
2537 dbg("CLK_START_VALUE_REGISTER Writing success status%d", status);
2538
2539 Data = 0x20;
2540 status = mos7840_set_reg_sync(serial->port[i],
2541 CLK_MULTI_REGISTER, Data);
2542 if (status < 0) {
2543 dbg("Writing CLK_MULTI_REGISTER failed status-0x%x",
2544 status);
2545 goto error;
2546 } else
2547 dbg("CLK_MULTI_REGISTER Writing success status%d",
2548 status);
2549
2550 /* write value 0x0 to scratchpad register */
2551 Data = 0x00;
2552 status = mos7840_set_uart_reg(serial->port[i],
2553 SCRATCH_PAD_REGISTER, Data);
2554 if (status < 0) {
2555 dbg("Writing SCRATCH_PAD_REGISTER failed status-0x%x",
2556 status);
2557 break;
2558 } else
2559 dbg("SCRATCH_PAD_REGISTER Writing success status%d",
2560 status);
2561
2562 /* Zero Length flag register */
2563 if ((mos7840_port->port_num != 1)
2564 && (serial->num_ports == 2)) {
2565
2566 Data = 0xff;
2567 status = mos7840_set_reg_sync(serial->port[i],
2568 (__u16) (ZLP_REG1 +
2569 ((__u16)mos7840_port->port_num)), Data);
2570 dbg("ZLIP offset %x",
2571 (__u16) (ZLP_REG1 +
2572 ((__u16) mos7840_port->port_num)));
2573 if (status < 0) {
2574 dbg("Writing ZLP_REG%d failed status-0x%x",
2575 i + 2, status);
2576 break;
2577 } else
2578 dbg("ZLP_REG%d Writing success status%d",
2579 i + 2, status);
2580 } else {
2581 Data = 0xff;
2582 status = mos7840_set_reg_sync(serial->port[i],
2583 (__u16) (ZLP_REG1 +
2584 ((__u16)mos7840_port->port_num) - 0x1), Data);
2585 dbg("ZLIP offset %x",
2586 (__u16) (ZLP_REG1 +
2587 ((__u16) mos7840_port->port_num) - 0x1));
2588 if (status < 0) {
2589 dbg("Writing ZLP_REG%d failed status-0x%x",
2590 i + 1, status);
2591 break;
2592 } else
2593 dbg("ZLP_REG%d Writing success status%d",
2594 i + 1, status);
2595
2596 }
2597 mos7840_port->control_urb = usb_alloc_urb(0, GFP_KERNEL);
2598 mos7840_port->ctrl_buf = kmalloc(16, GFP_KERNEL);
2599 mos7840_port->dr = kmalloc(sizeof(struct usb_ctrlrequest),
2600 GFP_KERNEL);
2601 if (!mos7840_port->control_urb || !mos7840_port->ctrl_buf ||
2602 !mos7840_port->dr) {
2603 status = -ENOMEM;
2604 goto error;
2605 }
2606 }
2607 dbg ("mos7840_startup: all ports configured...........");
2608
2609 /* Zero Length flag enable */
2610 Data = 0x0f;
2611 status = mos7840_set_reg_sync(serial->port[0], ZLP_REG5, Data);
2612 if (status < 0) {
2613 dbg("Writing ZLP_REG5 failed status-0x%x", status);
2614 goto error;
2615 } else
2616 dbg("ZLP_REG5 Writing success status%d", status);
2617
2618 /* setting configuration feature to one */
2619 usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0),
2620 (__u8) 0x03, 0x00, 0x01, 0x00, NULL, 0x00, 5 * HZ);
2621 return 0;
2622 error:
2623 for (/* nothing */; i >= 0; i--) {
2624 mos7840_port = mos7840_get_port_private(serial->port[i]);
2625
2626 kfree(mos7840_port->dr);
2627 kfree(mos7840_port->ctrl_buf);
2628 usb_free_urb(mos7840_port->control_urb);
2629 kfree(mos7840_port);
2630 serial->port[i] = NULL;
2631 }
2632 return status;
2633 }
2634
2635 /****************************************************************************
2636 * mos7840_disconnect
2637 * This function is called whenever the device is removed from the usb bus.
2638 ****************************************************************************/
2639
2640 static void mos7840_disconnect(struct usb_serial *serial)
2641 {
2642 int i;
2643 unsigned long flags;
2644 struct moschip_port *mos7840_port;
2645 dbg("%s", " disconnect :entering..........");
2646
2647 if (!serial) {
2648 dbg("%s", "Invalid Handler");
2649 return;
2650 }
2651
2652 /* check for the ports to be closed,close the ports and disconnect */
2653
2654 /* free private structure allocated for serial port *
2655 * stop reads and writes on all ports */
2656
2657 for (i = 0; i < serial->num_ports; ++i) {
2658 mos7840_port = mos7840_get_port_private(serial->port[i]);
2659 dbg ("mos7840_port %d = %p", i, mos7840_port);
2660 if (mos7840_port) {
2661 spin_lock_irqsave(&mos7840_port->pool_lock, flags);
2662 mos7840_port->zombie = 1;
2663 spin_unlock_irqrestore(&mos7840_port->pool_lock, flags);
2664 usb_kill_urb(mos7840_port->control_urb);
2665 }
2666 }
2667
2668 dbg("%s", "Thank u :: ");
2669
2670 }
2671
2672 /****************************************************************************
2673 * mos7840_release
2674 * This function is called when the usb_serial structure is freed.
2675 ****************************************************************************/
2676
2677 static void mos7840_release(struct usb_serial *serial)
2678 {
2679 int i;
2680 struct moschip_port *mos7840_port;
2681 dbg("%s", " release :entering..........");
2682
2683 if (!serial) {
2684 dbg("%s", "Invalid Handler");
2685 return;
2686 }
2687
2688 /* check for the ports to be closed,close the ports and disconnect */
2689
2690 /* free private structure allocated for serial port *
2691 * stop reads and writes on all ports */
2692
2693 for (i = 0; i < serial->num_ports; ++i) {
2694 mos7840_port = mos7840_get_port_private(serial->port[i]);
2695 dbg("mos7840_port %d = %p", i, mos7840_port);
2696 if (mos7840_port) {
2697 kfree(mos7840_port->ctrl_buf);
2698 kfree(mos7840_port->dr);
2699 kfree(mos7840_port);
2700 }
2701 }
2702
2703 dbg("%s", "Thank u :: ");
2704
2705 }
2706
2707 static struct usb_driver io_driver = {
2708 .name = "mos7840",
2709 .probe = usb_serial_probe,
2710 .disconnect = usb_serial_disconnect,
2711 .id_table = moschip_id_table_combined,
2712 .no_dynamic_id = 1,
2713 };
2714
2715 static struct usb_serial_driver moschip7840_4port_device = {
2716 .driver = {
2717 .owner = THIS_MODULE,
2718 .name = "mos7840",
2719 },
2720 .description = DRIVER_DESC,
2721 .usb_driver = &io_driver,
2722 .id_table = moschip_port_id_table,
2723 .num_ports = 4,
2724 .open = mos7840_open,
2725 .close = mos7840_close,
2726 .write = mos7840_write,
2727 .write_room = mos7840_write_room,
2728 .chars_in_buffer = mos7840_chars_in_buffer,
2729 .throttle = mos7840_throttle,
2730 .unthrottle = mos7840_unthrottle,
2731 .calc_num_ports = mos7840_calc_num_ports,
2732 #ifdef MCSSerialProbe
2733 .probe = mos7840_serial_probe,
2734 #endif
2735 .ioctl = mos7840_ioctl,
2736 .set_termios = mos7840_set_termios,
2737 .break_ctl = mos7840_break,
2738 .tiocmget = mos7840_tiocmget,
2739 .tiocmset = mos7840_tiocmset,
2740 .attach = mos7840_startup,
2741 .disconnect = mos7840_disconnect,
2742 .release = mos7840_release,
2743 .read_bulk_callback = mos7840_bulk_in_callback,
2744 .read_int_callback = mos7840_interrupt_callback,
2745 };
2746
2747 /****************************************************************************
2748 * moschip7840_init
2749 * This is called by the module subsystem, or on startup to initialize us
2750 ****************************************************************************/
2751 static int __init moschip7840_init(void)
2752 {
2753 int retval;
2754
2755 dbg("%s", " mos7840_init :entering..........");
2756
2757 /* Register with the usb serial */
2758 retval = usb_serial_register(&moschip7840_4port_device);
2759
2760 if (retval)
2761 goto failed_port_device_register;
2762
2763 dbg("%s", "Entering...");
2764 printk(KERN_INFO KBUILD_MODNAME ": " DRIVER_VERSION ":"
2765 DRIVER_DESC "\n");
2766
2767 /* Register with the usb */
2768 retval = usb_register(&io_driver);
2769 if (retval == 0) {
2770 dbg("%s", "Leaving...");
2771 return 0;
2772 }
2773 usb_serial_deregister(&moschip7840_4port_device);
2774 failed_port_device_register:
2775 return retval;
2776 }
2777
2778 /****************************************************************************
2779 * moschip7840_exit
2780 * Called when the driver is about to be unloaded.
2781 ****************************************************************************/
2782 static void __exit moschip7840_exit(void)
2783 {
2784
2785 dbg("%s", " mos7840_exit :entering..........");
2786
2787 usb_deregister(&io_driver);
2788
2789 usb_serial_deregister(&moschip7840_4port_device);
2790
2791 dbg("%s", "Entering...");
2792 }
2793
2794 module_init(moschip7840_init);
2795 module_exit(moschip7840_exit);
2796
2797 /* Module information */
2798 MODULE_DESCRIPTION(DRIVER_DESC);
2799 MODULE_LICENSE("GPL");
2800
2801 module_param(debug, bool, S_IRUGO | S_IWUSR);
2802 MODULE_PARM_DESC(debug, "Debug enabled or not");
Linux kernel - Deliverables
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