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PM: OMAP3: Removed a couple of unused variables from DVFS code
[linux-ginger.git] / drivers / usb / serial / mos7840.c
blobf11abf52be7db6b6e2afb082d86c8abd8fbd49e2
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/smp_lock.h>
30 #include <linux/tty.h>
31 #include <linux/tty_driver.h>
32 #include <linux/tty_flip.h>
33 #include <linux/module.h>
34 #include <linux/serial.h>
35 #include <linux/usb.h>
36 #include <linux/usb/serial.h>
37 #include <linux/uaccess.h>
38
39 /*
40 * Version Information
41 */
42 #define DRIVER_VERSION "1.3.2"
43 #define DRIVER_DESC "Moschip 7840/7820 USB Serial Driver"
44
45 /*
46 * 16C50 UART register defines
47 */
48
49 #define LCR_BITS_5 0x00 /* 5 bits/char */
50 #define LCR_BITS_6 0x01 /* 6 bits/char */
51 #define LCR_BITS_7 0x02 /* 7 bits/char */
52 #define LCR_BITS_8 0x03 /* 8 bits/char */
53 #define LCR_BITS_MASK 0x03 /* Mask for bits/char field */
54
55 #define LCR_STOP_1 0x00 /* 1 stop bit */
56 #define LCR_STOP_1_5 0x04 /* 1.5 stop bits (if 5 bits/char) */
57 #define LCR_STOP_2 0x04 /* 2 stop bits (if 6-8 bits/char) */
58 #define LCR_STOP_MASK 0x04 /* Mask for stop bits field */
59
60 #define LCR_PAR_NONE 0x00 /* No parity */
61 #define LCR_PAR_ODD 0x08 /* Odd parity */
62 #define LCR_PAR_EVEN 0x18 /* Even parity */
63 #define LCR_PAR_MARK 0x28 /* Force parity bit to 1 */
64 #define LCR_PAR_SPACE 0x38 /* Force parity bit to 0 */
65 #define LCR_PAR_MASK 0x38 /* Mask for parity field */
66
67 #define LCR_SET_BREAK 0x40 /* Set Break condition */
68 #define LCR_DL_ENABLE 0x80 /* Enable access to divisor latch */
69
70 #define MCR_DTR 0x01 /* Assert DTR */
71 #define MCR_RTS 0x02 /* Assert RTS */
72 #define MCR_OUT1 0x04 /* Loopback only: Sets state of RI */
73 #define MCR_MASTER_IE 0x08 /* Enable interrupt outputs */
74 #define MCR_LOOPBACK 0x10 /* Set internal (digital) loopback mode */
75 #define MCR_XON_ANY 0x20 /* Enable any char to exit XOFF mode */
76
77 #define MOS7840_MSR_CTS 0x10 /* Current state of CTS */
78 #define MOS7840_MSR_DSR 0x20 /* Current state of DSR */
79 #define MOS7840_MSR_RI 0x40 /* Current state of RI */
80 #define MOS7840_MSR_CD 0x80 /* Current state of CD */
81
82 /*
83 * Defines used for sending commands to port
84 */
85
86 #define WAIT_FOR_EVER (HZ * 0) /* timeout urb is wait for ever */
87 #define MOS_WDR_TIMEOUT (HZ * 5) /* default urb timeout */
88
89 #define MOS_PORT1 0x0200
90 #define MOS_PORT2 0x0300
91 #define MOS_VENREG 0x0000
92 #define MOS_MAX_PORT 0x02
93 #define MOS_WRITE 0x0E
94 #define MOS_READ 0x0D
95
96 /* Requests */
97 #define MCS_RD_RTYPE 0xC0
98 #define MCS_WR_RTYPE 0x40
99 #define MCS_RDREQ 0x0D
100 #define MCS_WRREQ 0x0E
101 #define MCS_CTRL_TIMEOUT 500
102 #define VENDOR_READ_LENGTH (0x01)
103
104 #define MAX_NAME_LEN 64
105
106 #define ZLP_REG1 0x3A /* Zero_Flag_Reg1 58 */
107 #define ZLP_REG5 0x3E /* Zero_Flag_Reg5 62 */
108
109 /* For higher baud Rates use TIOCEXBAUD */
110 #define TIOCEXBAUD 0x5462
111
112 /* vendor id and device id defines */
113
114 /* The native mos7840/7820 component */
115 #define USB_VENDOR_ID_MOSCHIP 0x9710
116 #define MOSCHIP_DEVICE_ID_7840 0x7840
117 #define MOSCHIP_DEVICE_ID_7820 0x7820
118 /* The native component can have its vendor/device id's overridden
119 * in vendor-specific implementations. Such devices can be handled
120 * by making a change here, in moschip_port_id_table, and in
121 * moschip_id_table_combined
122 */
123 #define USB_VENDOR_ID_BANDB 0x0856
124 #define BANDB_DEVICE_ID_USOPTL4_4 0xAC44
125 #define BANDB_DEVICE_ID_USOPTL4_2 0xAC42
126
127 /* This driver also supports
128 * ATEN UC2324 device using Moschip MCS7840
129 * ATEN UC2322 device using Moschip MCS7820
130 */
131 #define USB_VENDOR_ID_ATENINTL 0x0557
132 #define ATENINTL_DEVICE_ID_UC2324 0x2011
133 #define ATENINTL_DEVICE_ID_UC2322 0x7820
134
135 /* Interrupt Routine Defines */
136
137 #define SERIAL_IIR_RLS 0x06
138 #define SERIAL_IIR_MS 0x00
139
140 /*
141 * Emulation of the bit mask on the LINE STATUS REGISTER.
142 */
143 #define SERIAL_LSR_DR 0x0001
144 #define SERIAL_LSR_OE 0x0002
145 #define SERIAL_LSR_PE 0x0004
146 #define SERIAL_LSR_FE 0x0008
147 #define SERIAL_LSR_BI 0x0010
148
149 #define MOS_MSR_DELTA_CTS 0x10
150 #define MOS_MSR_DELTA_DSR 0x20
151 #define MOS_MSR_DELTA_RI 0x40
152 #define MOS_MSR_DELTA_CD 0x80
153
154 /* Serial Port register Address */
155 #define INTERRUPT_ENABLE_REGISTER ((__u16)(0x01))
156 #define FIFO_CONTROL_REGISTER ((__u16)(0x02))
157 #define LINE_CONTROL_REGISTER ((__u16)(0x03))
158 #define MODEM_CONTROL_REGISTER ((__u16)(0x04))
159 #define LINE_STATUS_REGISTER ((__u16)(0x05))
160 #define MODEM_STATUS_REGISTER ((__u16)(0x06))
161 #define SCRATCH_PAD_REGISTER ((__u16)(0x07))
162 #define DIVISOR_LATCH_LSB ((__u16)(0x00))
163 #define DIVISOR_LATCH_MSB ((__u16)(0x01))
164
165 #define CLK_MULTI_REGISTER ((__u16)(0x02))
166 #define CLK_START_VALUE_REGISTER ((__u16)(0x03))
167
168 #define SERIAL_LCR_DLAB ((__u16)(0x0080))
169
170 /*
171 * URB POOL related defines
172 */
173 #define NUM_URBS 16 /* URB Count */
174 #define URB_TRANSFER_BUFFER_SIZE 32 /* URB Size */
175
176
177 static struct usb_device_id moschip_port_id_table[] = {
178 {USB_DEVICE(USB_VENDOR_ID_MOSCHIP, MOSCHIP_DEVICE_ID_7840)},
179 {USB_DEVICE(USB_VENDOR_ID_MOSCHIP, MOSCHIP_DEVICE_ID_7820)},
180 {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USOPTL4_4)},
181 {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USOPTL4_2)},
182 {USB_DEVICE(USB_VENDOR_ID_ATENINTL, ATENINTL_DEVICE_ID_UC2324)},
183 {USB_DEVICE(USB_VENDOR_ID_ATENINTL, ATENINTL_DEVICE_ID_UC2322)},
184 {} /* terminating entry */
185 };
186
187 static __devinitdata struct usb_device_id moschip_id_table_combined[] = {
188 {USB_DEVICE(USB_VENDOR_ID_MOSCHIP, MOSCHIP_DEVICE_ID_7840)},
189 {USB_DEVICE(USB_VENDOR_ID_MOSCHIP, MOSCHIP_DEVICE_ID_7820)},
190 {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USOPTL4_4)},
191 {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USOPTL4_2)},
192 {USB_DEVICE(USB_VENDOR_ID_ATENINTL, ATENINTL_DEVICE_ID_UC2324)},
193 {USB_DEVICE(USB_VENDOR_ID_ATENINTL, ATENINTL_DEVICE_ID_UC2322)},
194 {} /* terminating entry */
195 };
196
197 MODULE_DEVICE_TABLE(usb, moschip_id_table_combined);
198
199 /* This structure holds all of the local port information */
200
201 struct moschip_port {
202 int port_num; /*Actual port number in the device(1,2,etc) */
203 struct urb *write_urb; /* write URB for this port */
204 struct urb *read_urb; /* read URB for this port */
205 struct urb *int_urb;
206 __u8 shadowLCR; /* last LCR value received */
207 __u8 shadowMCR; /* last MCR value received */
208 char open;
209 char open_ports;
210 char zombie;
211 wait_queue_head_t wait_chase; /* for handling sleeping while waiting for chase to finish */
212 wait_queue_head_t delta_msr_wait; /* for handling sleeping while waiting for msr change to happen */
213 int delta_msr_cond;
214 struct async_icount icount;
215 struct usb_serial_port *port; /* loop back to the owner of this object */
216
217 /* Offsets */
218 __u8 SpRegOffset;
219 __u8 ControlRegOffset;
220 __u8 DcrRegOffset;
221 /* for processing control URBS in interrupt context */
222 struct urb *control_urb;
223 struct usb_ctrlrequest *dr;
224 char *ctrl_buf;
225 int MsrLsr;
226
227 spinlock_t pool_lock;
228 struct urb *write_urb_pool[NUM_URBS];
229 char busy[NUM_URBS];
230 bool read_urb_busy;
231 };
232
233
234 static int debug;
235
236 /*
237 * mos7840_set_reg_sync
238 * To set the Control register by calling usb_fill_control_urb function
239 * by passing usb_sndctrlpipe function as parameter.
240 */
241
242 static int mos7840_set_reg_sync(struct usb_serial_port *port, __u16 reg,
243 __u16 val)
244 {
245 struct usb_device *dev = port->serial->dev;
246 val = val & 0x00ff;
247 dbg("mos7840_set_reg_sync offset is %x, value %x", reg, val);
248
249 return usb_control_msg(dev, usb_sndctrlpipe(dev, 0), MCS_WRREQ,
250 MCS_WR_RTYPE, val, reg, NULL, 0,
251 MOS_WDR_TIMEOUT);
252 }
253
254 /*
255 * mos7840_get_reg_sync
256 * To set the Uart register by calling usb_fill_control_urb function by
257 * passing usb_rcvctrlpipe function as parameter.
258 */
259
260 static int mos7840_get_reg_sync(struct usb_serial_port *port, __u16 reg,
261 __u16 *val)
262 {
263 struct usb_device *dev = port->serial->dev;
264 int ret = 0;
265
266 ret = usb_control_msg(dev, usb_rcvctrlpipe(dev, 0), MCS_RDREQ,
267 MCS_RD_RTYPE, 0, reg, val, VENDOR_READ_LENGTH,
268 MOS_WDR_TIMEOUT);
269 dbg("mos7840_get_reg_sync offset is %x, return val %x", reg, *val);
270 *val = (*val) & 0x00ff;
271 return ret;
272 }
273
274 /*
275 * mos7840_set_uart_reg
276 * To set the Uart register by calling usb_fill_control_urb function by
277 * passing usb_sndctrlpipe function as parameter.
278 */
279
280 static int mos7840_set_uart_reg(struct usb_serial_port *port, __u16 reg,
281 __u16 val)
282 {
283
284 struct usb_device *dev = port->serial->dev;
285 val = val & 0x00ff;
286 /* For the UART control registers, the application number need
287 to be Or'ed */
288 if (port->serial->num_ports == 4) {
289 val |= (((__u16) port->number -
290 (__u16) (port->serial->minor)) + 1) << 8;
291 dbg("mos7840_set_uart_reg application number is %x", val);
292 } else {
293 if (((__u16) port->number - (__u16) (port->serial->minor)) == 0) {
294 val |= (((__u16) port->number -
295 (__u16) (port->serial->minor)) + 1) << 8;
296 dbg("mos7840_set_uart_reg application number is %x",
297 val);
298 } else {
299 val |=
300 (((__u16) port->number -
301 (__u16) (port->serial->minor)) + 2) << 8;
302 dbg("mos7840_set_uart_reg application number is %x",
303 val);
304 }
305 }
306 return usb_control_msg(dev, usb_sndctrlpipe(dev, 0), MCS_WRREQ,
307 MCS_WR_RTYPE, val, reg, NULL, 0,
308 MOS_WDR_TIMEOUT);
309
310 }
311
312 /*
313 * mos7840_get_uart_reg
314 * To set the Control register by calling usb_fill_control_urb function
315 * by passing usb_rcvctrlpipe function as parameter.
316 */
317 static int mos7840_get_uart_reg(struct usb_serial_port *port, __u16 reg,
318 __u16 *val)
319 {
320 struct usb_device *dev = port->serial->dev;
321 int ret = 0;
322 __u16 Wval;
323
324 /* dbg("application number is %4x",
325 (((__u16)port->number - (__u16)(port->serial->minor))+1)<<8); */
326 /* Wval is same as application number */
327 if (port->serial->num_ports == 4) {
328 Wval =
329 (((__u16) port->number - (__u16) (port->serial->minor)) +
330 1) << 8;
331 dbg("mos7840_get_uart_reg application number is %x", Wval);
332 } else {
333 if (((__u16) port->number - (__u16) (port->serial->minor)) == 0) {
334 Wval = (((__u16) port->number -
335 (__u16) (port->serial->minor)) + 1) << 8;
336 dbg("mos7840_get_uart_reg application number is %x",
337 Wval);
338 } else {
339 Wval = (((__u16) port->number -
340 (__u16) (port->serial->minor)) + 2) << 8;
341 dbg("mos7840_get_uart_reg application number is %x",
342 Wval);
343 }
344 }
345 ret = usb_control_msg(dev, usb_rcvctrlpipe(dev, 0), MCS_RDREQ,
346 MCS_RD_RTYPE, Wval, reg, val, VENDOR_READ_LENGTH,
347 MOS_WDR_TIMEOUT);
348 *val = (*val) & 0x00ff;
349 return ret;
350 }
351
352 static void mos7840_dump_serial_port(struct moschip_port *mos7840_port)
353 {
354
355 dbg("***************************************");
356 dbg("SpRegOffset is %2x", mos7840_port->SpRegOffset);
357 dbg("ControlRegOffset is %2x", mos7840_port->ControlRegOffset);
358 dbg("DCRRegOffset is %2x", mos7840_port->DcrRegOffset);
359 dbg("***************************************");
360
361 }
362
363 /************************************************************************/
364 /************************************************************************/
365 /* I N T E R F A C E F U N C T I O N S */
366 /* I N T E R F A C E F U N C T I O N S */
367 /************************************************************************/
368 /************************************************************************/
369
370 static inline void mos7840_set_port_private(struct usb_serial_port *port,
371 struct moschip_port *data)
372 {
373 usb_set_serial_port_data(port, (void *)data);
374 }
375
376 static inline struct moschip_port *mos7840_get_port_private(struct
377 usb_serial_port
378 *port)
379 {
380 return (struct moschip_port *)usb_get_serial_port_data(port);
381 }
382
383 static void mos7840_handle_new_msr(struct moschip_port *port, __u8 new_msr)
384 {
385 struct moschip_port *mos7840_port;
386 struct async_icount *icount;
387 mos7840_port = port;
388 icount = &mos7840_port->icount;
389 if (new_msr &
390 (MOS_MSR_DELTA_CTS | MOS_MSR_DELTA_DSR | MOS_MSR_DELTA_RI |
391 MOS_MSR_DELTA_CD)) {
392 icount = &mos7840_port->icount;
393
394 /* update input line counters */
395 if (new_msr & MOS_MSR_DELTA_CTS) {
396 icount->cts++;
397 smp_wmb();
398 }
399 if (new_msr & MOS_MSR_DELTA_DSR) {
400 icount->dsr++;
401 smp_wmb();
402 }
403 if (new_msr & MOS_MSR_DELTA_CD) {
404 icount->dcd++;
405 smp_wmb();
406 }
407 if (new_msr & MOS_MSR_DELTA_RI) {
408 icount->rng++;
409 smp_wmb();
410 }
411 }
412 }
413
414 static void mos7840_handle_new_lsr(struct moschip_port *port, __u8 new_lsr)
415 {
416 struct async_icount *icount;
417
418 dbg("%s - %02x", __func__, new_lsr);
419
420 if (new_lsr & SERIAL_LSR_BI) {
421 /*
422 * Parity and Framing errors only count if they
423 * occur exclusive of a break being
424 * received.
425 */
426 new_lsr &= (__u8) (SERIAL_LSR_OE | SERIAL_LSR_BI);
427 }
428
429 /* update input line counters */
430 icount = &port->icount;
431 if (new_lsr & SERIAL_LSR_BI) {
432 icount->brk++;
433 smp_wmb();
434 }
435 if (new_lsr & SERIAL_LSR_OE) {
436 icount->overrun++;
437 smp_wmb();
438 }
439 if (new_lsr & SERIAL_LSR_PE) {
440 icount->parity++;
441 smp_wmb();
442 }
443 if (new_lsr & SERIAL_LSR_FE) {
444 icount->frame++;
445 smp_wmb();
446 }
447 }
448
449 /************************************************************************/
450 /************************************************************************/
451 /* U S B C A L L B A C K F U N C T I O N S */
452 /* U S B C A L L B A C K F U N C T I O N S */
453 /************************************************************************/
454 /************************************************************************/
455
456 static void mos7840_control_callback(struct urb *urb)
457 {
458 unsigned char *data;
459 struct moschip_port *mos7840_port;
460 __u8 regval = 0x0;
461 int result = 0;
462 int status = urb->status;
463
464 mos7840_port = urb->context;
465
466 switch (status) {
467 case 0:
468 /* success */
469 break;
470 case -ECONNRESET:
471 case -ENOENT:
472 case -ESHUTDOWN:
473 /* this urb is terminated, clean up */
474 dbg("%s - urb shutting down with status: %d", __func__,
475 status);
476 return;
477 default:
478 dbg("%s - nonzero urb status received: %d", __func__,
479 status);
480 goto exit;
481 }
482
483 dbg("%s urb buffer size is %d", __func__, urb->actual_length);
484 dbg("%s mos7840_port->MsrLsr is %d port %d", __func__,
485 mos7840_port->MsrLsr, mos7840_port->port_num);
486 data = urb->transfer_buffer;
487 regval = (__u8) data[0];
488 dbg("%s data is %x", __func__, regval);
489 if (mos7840_port->MsrLsr == 0)
490 mos7840_handle_new_msr(mos7840_port, regval);
491 else if (mos7840_port->MsrLsr == 1)
492 mos7840_handle_new_lsr(mos7840_port, regval);
493
494 exit:
495 spin_lock(&mos7840_port->pool_lock);
496 if (!mos7840_port->zombie)
497 result = usb_submit_urb(mos7840_port->int_urb, GFP_ATOMIC);
498 spin_unlock(&mos7840_port->pool_lock);
499 if (result) {
500 dev_err(&urb->dev->dev,
501 "%s - Error %d submitting interrupt urb\n",
502 __func__, result);
503 }
504 }
505
506 static int mos7840_get_reg(struct moschip_port *mcs, __u16 Wval, __u16 reg,
507 __u16 *val)
508 {
509 struct usb_device *dev = mcs->port->serial->dev;
510 struct usb_ctrlrequest *dr = mcs->dr;
511 unsigned char *buffer = mcs->ctrl_buf;
512 int ret;
513
514 dr->bRequestType = MCS_RD_RTYPE;
515 dr->bRequest = MCS_RDREQ;
516 dr->wValue = cpu_to_le16(Wval); /* 0 */
517 dr->wIndex = cpu_to_le16(reg);
518 dr->wLength = cpu_to_le16(2);
519
520 usb_fill_control_urb(mcs->control_urb, dev, usb_rcvctrlpipe(dev, 0),
521 (unsigned char *)dr, buffer, 2,
522 mos7840_control_callback, mcs);
523 mcs->control_urb->transfer_buffer_length = 2;
524 ret = usb_submit_urb(mcs->control_urb, GFP_ATOMIC);
525 return ret;
526 }
527
528 /*****************************************************************************
529 * mos7840_interrupt_callback
530 * this is the callback function for when we have received data on the
531 * interrupt endpoint.
532 *****************************************************************************/
533
534 static void mos7840_interrupt_callback(struct urb *urb)
535 {
536 int result;
537 int length;
538 struct moschip_port *mos7840_port;
539 struct usb_serial *serial;
540 __u16 Data;
541 unsigned char *data;
542 __u8 sp[5], st;
543 int i, rv = 0;
544 __u16 wval, wreg = 0;
545 int status = urb->status;
546
547 dbg("%s", " : Entering");
548
549 switch (status) {
550 case 0:
551 /* success */
552 break;
553 case -ECONNRESET:
554 case -ENOENT:
555 case -ESHUTDOWN:
556 /* this urb is terminated, clean up */
557 dbg("%s - urb shutting down with status: %d", __func__,
558 status);
559 return;
560 default:
561 dbg("%s - nonzero urb status received: %d", __func__,
562 status);
563 goto exit;
564 }
565
566 length = urb->actual_length;
567 data = urb->transfer_buffer;
568
569 serial = urb->context;
570
571 /* Moschip get 5 bytes
572 * Byte 1 IIR Port 1 (port.number is 0)
573 * Byte 2 IIR Port 2 (port.number is 1)
574 * Byte 3 IIR Port 3 (port.number is 2)
575 * Byte 4 IIR Port 4 (port.number is 3)
576 * Byte 5 FIFO status for both */
577
578 if (length && length > 5) {
579 dbg("%s", "Wrong data !!!");
580 return;
581 }
582
583 sp[0] = (__u8) data[0];
584 sp[1] = (__u8) data[1];
585 sp[2] = (__u8) data[2];
586 sp[3] = (__u8) data[3];
587 st = (__u8) data[4];
588
589 for (i = 0; i < serial->num_ports; i++) {
590 mos7840_port = mos7840_get_port_private(serial->port[i]);
591 wval =
592 (((__u16) serial->port[i]->number -
593 (__u16) (serial->minor)) + 1) << 8;
594 if (mos7840_port->open) {
595 if (sp[i] & 0x01) {
596 dbg("SP%d No Interrupt !!!", i);
597 } else {
598 switch (sp[i] & 0x0f) {
599 case SERIAL_IIR_RLS:
600 dbg("Serial Port %d: Receiver status error or ", i);
601 dbg("address bit detected in 9-bit mode");
602 mos7840_port->MsrLsr = 1;
603 wreg = LINE_STATUS_REGISTER;
604 break;
605 case SERIAL_IIR_MS:
606 dbg("Serial Port %d: Modem status change", i);
607 mos7840_port->MsrLsr = 0;
608 wreg = MODEM_STATUS_REGISTER;
609 break;
610 }
611 spin_lock(&mos7840_port->pool_lock);
612 if (!mos7840_port->zombie) {
613 rv = mos7840_get_reg(mos7840_port, wval, wreg, &Data);
614 } else {
615 spin_unlock(&mos7840_port->pool_lock);
616 return;
617 }
618 spin_unlock(&mos7840_port->pool_lock);
619 }
620 }
621 }
622 if (!(rv < 0))
623 /* the completion handler for the control urb will resubmit */
624 return;
625 exit:
626 result = usb_submit_urb(urb, GFP_ATOMIC);
627 if (result) {
628 dev_err(&urb->dev->dev,
629 "%s - Error %d submitting interrupt urb\n",
630 __func__, result);
631 }
632 }
633
634 static int mos7840_port_paranoia_check(struct usb_serial_port *port,
635 const char *function)
636 {
637 if (!port) {
638 dbg("%s - port == NULL", function);
639 return -1;
640 }
641 if (!port->serial) {
642 dbg("%s - port->serial == NULL", function);
643 return -1;
644 }
645
646 return 0;
647 }
648
649 /* Inline functions to check the sanity of a pointer that is passed to us */
650 static int mos7840_serial_paranoia_check(struct usb_serial *serial,
651 const char *function)
652 {
653 if (!serial) {
654 dbg("%s - serial == NULL", function);
655 return -1;
656 }
657 if (!serial->type) {
658 dbg("%s - serial->type == NULL!", function);
659 return -1;
660 }
661
662 return 0;
663 }
664
665 static struct usb_serial *mos7840_get_usb_serial(struct usb_serial_port *port,
666 const char *function)
667 {
668 /* if no port was specified, or it fails a paranoia check */
669 if (!port ||
670 mos7840_port_paranoia_check(port, function) ||
671 mos7840_serial_paranoia_check(port->serial, function)) {
672 /* then say that we don't have a valid usb_serial thing,
673 * which will end up genrating -ENODEV return values */
674 return NULL;
675 }
676
677 return port->serial;
678 }
679
680 /*****************************************************************************
681 * mos7840_bulk_in_callback
682 * this is the callback function for when we have received data on the
683 * bulk in endpoint.
684 *****************************************************************************/
685
686 static void mos7840_bulk_in_callback(struct urb *urb)
687 {
688 int retval;
689 unsigned char *data;
690 struct usb_serial *serial;
691 struct usb_serial_port *port;
692 struct moschip_port *mos7840_port;
693 struct tty_struct *tty;
694 int status = urb->status;
695
696 mos7840_port = urb->context;
697 if (!mos7840_port) {
698 dbg("%s", "NULL mos7840_port pointer");
699 mos7840_port->read_urb_busy = false;
700 return;
701 }
702
703 if (status) {
704 dbg("nonzero read bulk status received: %d", status);
705 mos7840_port->read_urb_busy = false;
706 return;
707 }
708
709 port = (struct usb_serial_port *)mos7840_port->port;
710 if (mos7840_port_paranoia_check(port, __func__)) {
711 dbg("%s", "Port Paranoia failed");
712 mos7840_port->read_urb_busy = false;
713 return;
714 }
715
716 serial = mos7840_get_usb_serial(port, __func__);
717 if (!serial) {
718 dbg("%s", "Bad serial pointer");
719 mos7840_port->read_urb_busy = false;
720 return;
721 }
722
723 dbg("%s", "Entering... ");
724
725 data = urb->transfer_buffer;
726
727 dbg("%s", "Entering ...........");
728
729 if (urb->actual_length) {
730 tty = tty_port_tty_get(&mos7840_port->port->port);
731 if (tty) {
732 tty_buffer_request_room(tty, urb->actual_length);
733 tty_insert_flip_string(tty, data, urb->actual_length);
734 dbg(" %s ", data);
735 tty_flip_buffer_push(tty);
736 tty_kref_put(tty);
737 }
738 mos7840_port->icount.rx += urb->actual_length;
739 smp_wmb();
740 dbg("mos7840_port->icount.rx is %d:",
741 mos7840_port->icount.rx);
742 }
743
744 if (!mos7840_port->read_urb) {
745 dbg("%s", "URB KILLED !!!");
746 mos7840_port->read_urb_busy = false;
747 return;
748 }
749
750
751 mos7840_port->read_urb->dev = serial->dev;
752
753 mos7840_port->read_urb_busy = true;
754 retval = usb_submit_urb(mos7840_port->read_urb, GFP_ATOMIC);
755
756 if (retval) {
757 dbg("usb_submit_urb(read bulk) failed, retval = %d", retval);
758 mos7840_port->read_urb_busy = false;
759 }
760 }
761
762 /*****************************************************************************
763 * mos7840_bulk_out_data_callback
764 * this is the callback function for when we have finished sending
765 * serial data on the bulk out endpoint.
766 *****************************************************************************/
767
768 static void mos7840_bulk_out_data_callback(struct urb *urb)
769 {
770 struct moschip_port *mos7840_port;
771 struct tty_struct *tty;
772 int status = urb->status;
773 int i;
774
775 mos7840_port = urb->context;
776 spin_lock(&mos7840_port->pool_lock);
777 for (i = 0; i < NUM_URBS; i++) {
778 if (urb == mos7840_port->write_urb_pool[i]) {
779 mos7840_port->busy[i] = 0;
780 break;
781 }
782 }
783 spin_unlock(&mos7840_port->pool_lock);
784
785 if (status) {
786 dbg("nonzero write bulk status received:%d", status);
787 return;
788 }
789
790 if (mos7840_port_paranoia_check(mos7840_port->port, __func__)) {
791 dbg("%s", "Port Paranoia failed");
792 return;
793 }
794
795 dbg("%s", "Entering .........");
796
797 tty = tty_port_tty_get(&mos7840_port->port->port);
798 if (tty && mos7840_port->open)
799 tty_wakeup(tty);
800 tty_kref_put(tty);
801
802 }
803
804 /************************************************************************/
805 /* 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 */
806 /************************************************************************/
807 #ifdef MCSSerialProbe
808 static int mos7840_serial_probe(struct usb_serial *serial,
809 const struct usb_device_id *id)
810 {
811
812 /*need to implement the mode_reg reading and updating\
813 structures usb_serial_ device_type\
814 (i.e num_ports, num_bulkin,bulkout etc) */
815 /* Also we can update the changes attach */
816 return 1;
817 }
818 #endif
819
820 /*****************************************************************************
821 * mos7840_open
822 * this function is called by the tty driver when a port is opened
823 * If successful, we return 0
824 * Otherwise we return a negative error number.
825 *****************************************************************************/
826
827 static int mos7840_open(struct tty_struct *tty, struct usb_serial_port *port)
828 {
829 int response;
830 int j;
831 struct usb_serial *serial;
832 struct urb *urb;
833 __u16 Data;
834 int status;
835 struct moschip_port *mos7840_port;
836 struct moschip_port *port0;
837
838 dbg ("%s enter", __func__);
839
840 if (mos7840_port_paranoia_check(port, __func__)) {
841 dbg("%s", "Port Paranoia failed");
842 return -ENODEV;
843 }
844
845 serial = port->serial;
846
847 if (mos7840_serial_paranoia_check(serial, __func__)) {
848 dbg("%s", "Serial Paranoia failed");
849 return -ENODEV;
850 }
851
852 mos7840_port = mos7840_get_port_private(port);
853 port0 = mos7840_get_port_private(serial->port[0]);
854
855 if (mos7840_port == NULL || port0 == NULL)
856 return -ENODEV;
857
858 usb_clear_halt(serial->dev, port->write_urb->pipe);
859 usb_clear_halt(serial->dev, port->read_urb->pipe);
860 port0->open_ports++;
861
862 /* Initialising the write urb pool */
863 for (j = 0; j < NUM_URBS; ++j) {
864 urb = usb_alloc_urb(0, GFP_KERNEL);
865 mos7840_port->write_urb_pool[j] = urb;
866
867 if (urb == NULL) {
868 dev_err(&port->dev, "No more urbs???\n");
869 continue;
870 }
871
872 urb->transfer_buffer = kmalloc(URB_TRANSFER_BUFFER_SIZE,
873 GFP_KERNEL);
874 if (!urb->transfer_buffer) {
875 usb_free_urb(urb);
876 mos7840_port->write_urb_pool[j] = NULL;
877 dev_err(&port->dev,
878 "%s-out of memory for urb buffers.\n",
879 __func__);
880 continue;
881 }
882 }
883
884 /*****************************************************************************
885 * Initialize MCS7840 -- Write Init values to corresponding Registers
886 *
887 * Register Index
888 * 1 : IER
889 * 2 : FCR
890 * 3 : LCR
891 * 4 : MCR
892 *
893 * 0x08 : SP1/2 Control Reg
894 *****************************************************************************/
895
896 /* NEED to check the following Block */
897
898 Data = 0x0;
899 status = mos7840_get_reg_sync(port, mos7840_port->SpRegOffset, &Data);
900 if (status < 0) {
901 dbg("Reading Spreg failed");
902 return -1;
903 }
904 Data |= 0x80;
905 status = mos7840_set_reg_sync(port, mos7840_port->SpRegOffset, Data);
906 if (status < 0) {
907 dbg("writing Spreg failed");
908 return -1;
909 }
910
911 Data &= ~0x80;
912 status = mos7840_set_reg_sync(port, mos7840_port->SpRegOffset, Data);
913 if (status < 0) {
914 dbg("writing Spreg failed");
915 return -1;
916 }
917 /* End of block to be checked */
918
919 Data = 0x0;
920 status = mos7840_get_reg_sync(port, mos7840_port->ControlRegOffset,
921 &Data);
922 if (status < 0) {
923 dbg("Reading Controlreg failed");
924 return -1;
925 }
926 Data |= 0x08; /* Driver done bit */
927 Data |= 0x20; /* rx_disable */
928 status = mos7840_set_reg_sync(port,
929 mos7840_port->ControlRegOffset, Data);
930 if (status < 0) {
931 dbg("writing Controlreg failed");
932 return -1;
933 }
934 /* do register settings here */
935 /* Set all regs to the device default values. */
936 /***********************************
937 * First Disable all interrupts.
938 ***********************************/
939 Data = 0x00;
940 status = mos7840_set_uart_reg(port, INTERRUPT_ENABLE_REGISTER, Data);
941 if (status < 0) {
942 dbg("disabling interrupts failed");
943 return -1;
944 }
945 /* Set FIFO_CONTROL_REGISTER to the default value */
946 Data = 0x00;
947 status = mos7840_set_uart_reg(port, FIFO_CONTROL_REGISTER, Data);
948 if (status < 0) {
949 dbg("Writing FIFO_CONTROL_REGISTER failed");
950 return -1;
951 }
952
953 Data = 0xcf;
954 status = mos7840_set_uart_reg(port, FIFO_CONTROL_REGISTER, Data);
955 if (status < 0) {
956 dbg("Writing FIFO_CONTROL_REGISTER failed");
957 return -1;
958 }
959
960 Data = 0x03;
961 status = mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data);
962 mos7840_port->shadowLCR = Data;
963
964 Data = 0x0b;
965 status = mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER, Data);
966 mos7840_port->shadowMCR = Data;
967
968 Data = 0x00;
969 status = mos7840_get_uart_reg(port, LINE_CONTROL_REGISTER, &Data);
970 mos7840_port->shadowLCR = Data;
971
972 Data |= SERIAL_LCR_DLAB; /* data latch enable in LCR 0x80 */
973 status = mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data);
974
975 Data = 0x0c;
976 status = mos7840_set_uart_reg(port, DIVISOR_LATCH_LSB, Data);
977
978 Data = 0x0;
979 status = mos7840_set_uart_reg(port, DIVISOR_LATCH_MSB, Data);
980
981 Data = 0x00;
982 status = mos7840_get_uart_reg(port, LINE_CONTROL_REGISTER, &Data);
983
984 Data = Data & ~SERIAL_LCR_DLAB;
985 status = mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data);
986 mos7840_port->shadowLCR = Data;
987
988 /* clearing Bulkin and Bulkout Fifo */
989 Data = 0x0;
990 status = mos7840_get_reg_sync(port, mos7840_port->SpRegOffset, &Data);
991
992 Data = Data | 0x0c;
993 status = mos7840_set_reg_sync(port, mos7840_port->SpRegOffset, Data);
994
995 Data = Data & ~0x0c;
996 status = mos7840_set_reg_sync(port, mos7840_port->SpRegOffset, Data);
997 /* Finally enable all interrupts */
998 Data = 0x0c;
999 status = mos7840_set_uart_reg(port, INTERRUPT_ENABLE_REGISTER, Data);
1000
1001 /* clearing rx_disable */
1002 Data = 0x0;
1003 status = mos7840_get_reg_sync(port, mos7840_port->ControlRegOffset,
1004 &Data);
1005 Data = Data & ~0x20;
1006 status = mos7840_set_reg_sync(port, mos7840_port->ControlRegOffset,
1007 Data);
1008
1009 /* rx_negate */
1010 Data = 0x0;
1011 status = mos7840_get_reg_sync(port, mos7840_port->ControlRegOffset,
1012 &Data);
1013 Data = Data | 0x10;
1014 status = mos7840_set_reg_sync(port, mos7840_port->ControlRegOffset,
1015 Data);
1016
1017 /* Check to see if we've set up our endpoint info yet *
1018 * (can't set it up in mos7840_startup as the structures *
1019 * were not set up at that time.) */
1020 if (port0->open_ports == 1) {
1021 if (serial->port[0]->interrupt_in_buffer == NULL) {
1022 /* set up interrupt urb */
1023 usb_fill_int_urb(serial->port[0]->interrupt_in_urb,
1024 serial->dev,
1025 usb_rcvintpipe(serial->dev,
1026 serial->port[0]->interrupt_in_endpointAddress),
1027 serial->port[0]->interrupt_in_buffer,
1028 serial->port[0]->interrupt_in_urb->
1029 transfer_buffer_length,
1030 mos7840_interrupt_callback,
1031 serial,
1032 serial->port[0]->interrupt_in_urb->interval);
1033
1034 /* start interrupt read for mos7840 *
1035 * will continue as long as mos7840 is connected */
1036
1037 response =
1038 usb_submit_urb(serial->port[0]->interrupt_in_urb,
1039 GFP_KERNEL);
1040 if (response) {
1041 dev_err(&port->dev, "%s - Error %d submitting "
1042 "interrupt urb\n", __func__, response);
1043 }
1044
1045 }
1046
1047 }
1048
1049 /* see if we've set up our endpoint info yet *
1050 * (can't set it up in mos7840_startup as the *
1051 * structures were not set up at that time.) */
1052
1053 dbg("port number is %d", port->number);
1054 dbg("serial number is %d", port->serial->minor);
1055 dbg("Bulkin endpoint is %d", port->bulk_in_endpointAddress);
1056 dbg("BulkOut endpoint is %d", port->bulk_out_endpointAddress);
1057 dbg("Interrupt endpoint is %d", port->interrupt_in_endpointAddress);
1058 dbg("port's number in the device is %d", mos7840_port->port_num);
1059 mos7840_port->read_urb = port->read_urb;
1060
1061 /* set up our bulk in urb */
1062
1063 usb_fill_bulk_urb(mos7840_port->read_urb,
1064 serial->dev,
1065 usb_rcvbulkpipe(serial->dev,
1066 port->bulk_in_endpointAddress),
1067 port->bulk_in_buffer,
1068 mos7840_port->read_urb->transfer_buffer_length,
1069 mos7840_bulk_in_callback, mos7840_port);
1070
1071 dbg("mos7840_open: bulkin endpoint is %d",
1072 port->bulk_in_endpointAddress);
1073 mos7840_port->read_urb_busy = true;
1074 response = usb_submit_urb(mos7840_port->read_urb, GFP_KERNEL);
1075 if (response) {
1076 dev_err(&port->dev, "%s - Error %d submitting control urb\n",
1077 __func__, response);
1078 mos7840_port->read_urb_busy = false;
1079 }
1080
1081 /* initialize our wait queues */
1082 init_waitqueue_head(&mos7840_port->wait_chase);
1083 init_waitqueue_head(&mos7840_port->delta_msr_wait);
1084
1085 /* initialize our icount structure */
1086 memset(&(mos7840_port->icount), 0x00, sizeof(mos7840_port->icount));
1087
1088 /* initialize our port settings */
1089 /* Must set to enable ints! */
1090 mos7840_port->shadowMCR = MCR_MASTER_IE;
1091 /* send a open port command */
1092 mos7840_port->open = 1;
1093 /* mos7840_change_port_settings(mos7840_port,old_termios); */
1094 mos7840_port->icount.tx = 0;
1095 mos7840_port->icount.rx = 0;
1096
1097 dbg("usb_serial serial:%p mos7840_port:%p\n usb_serial_port port:%p",
1098 serial, mos7840_port, port);
1099
1100 dbg ("%s leave", __func__);
1101
1102 return 0;
1103
1104 }
1105
1106 /*****************************************************************************
1107 * mos7840_chars_in_buffer
1108 * this function is called by the tty driver when it wants to know how many
1109 * bytes of data we currently have outstanding in the port (data that has
1110 * been written, but hasn't made it out the port yet)
1111 * If successful, we return the number of bytes left to be written in the
1112 * system,
1113 * Otherwise we return zero.
1114 *****************************************************************************/
1115
1116 static int mos7840_chars_in_buffer(struct tty_struct *tty)
1117 {
1118 struct usb_serial_port *port = tty->driver_data;
1119 int i;
1120 int chars = 0;
1121 unsigned long flags;
1122 struct moschip_port *mos7840_port;
1123
1124 dbg("%s", " mos7840_chars_in_buffer:entering ...........");
1125
1126 if (mos7840_port_paranoia_check(port, __func__)) {
1127 dbg("%s", "Invalid port");
1128 return 0;
1129 }
1130
1131 mos7840_port = mos7840_get_port_private(port);
1132 if (mos7840_port == NULL) {
1133 dbg("%s", "mos7840_break:leaving ...........");
1134 return 0;
1135 }
1136
1137 spin_lock_irqsave(&mos7840_port->pool_lock, flags);
1138 for (i = 0; i < NUM_URBS; ++i)
1139 if (mos7840_port->busy[i])
1140 chars += URB_TRANSFER_BUFFER_SIZE;
1141 spin_unlock_irqrestore(&mos7840_port->pool_lock, flags);
1142 dbg("%s - returns %d", __func__, chars);
1143 return chars;
1144
1145 }
1146
1147 /*****************************************************************************
1148 * mos7840_close
1149 * this function is called by the tty driver when a port is closed
1150 *****************************************************************************/
1151
1152 static void mos7840_close(struct usb_serial_port *port)
1153 {
1154 struct usb_serial *serial;
1155 struct moschip_port *mos7840_port;
1156 struct moschip_port *port0;
1157 int j;
1158 __u16 Data;
1159
1160 dbg("%s", "mos7840_close:entering...");
1161
1162 if (mos7840_port_paranoia_check(port, __func__)) {
1163 dbg("%s", "Port Paranoia failed");
1164 return;
1165 }
1166
1167 serial = mos7840_get_usb_serial(port, __func__);
1168 if (!serial) {
1169 dbg("%s", "Serial Paranoia failed");
1170 return;
1171 }
1172
1173 mos7840_port = mos7840_get_port_private(port);
1174 port0 = mos7840_get_port_private(serial->port[0]);
1175
1176 if (mos7840_port == NULL || port0 == NULL)
1177 return;
1178
1179 for (j = 0; j < NUM_URBS; ++j)
1180 usb_kill_urb(mos7840_port->write_urb_pool[j]);
1181
1182 /* Freeing Write URBs */
1183 for (j = 0; j < NUM_URBS; ++j) {
1184 if (mos7840_port->write_urb_pool[j]) {
1185 if (mos7840_port->write_urb_pool[j]->transfer_buffer)
1186 kfree(mos7840_port->write_urb_pool[j]->
1187 transfer_buffer);
1188
1189 usb_free_urb(mos7840_port->write_urb_pool[j]);
1190 }
1191 }
1192
1193 /* While closing port, shutdown all bulk read, write *
1194 * and interrupt read if they exists */
1195 if (serial->dev) {
1196 if (mos7840_port->write_urb) {
1197 dbg("%s", "Shutdown bulk write");
1198 usb_kill_urb(mos7840_port->write_urb);
1199 }
1200 if (mos7840_port->read_urb) {
1201 dbg("%s", "Shutdown bulk read");
1202 usb_kill_urb(mos7840_port->read_urb);
1203 mos7840_port->read_urb_busy = false;
1204 }
1205 if ((&mos7840_port->control_urb)) {
1206 dbg("%s", "Shutdown control read");
1207 /*/ usb_kill_urb (mos7840_port->control_urb); */
1208 }
1209 }
1210 /* if(mos7840_port->ctrl_buf != NULL) */
1211 /* kfree(mos7840_port->ctrl_buf); */
1212 port0->open_ports--;
1213 dbg("mos7840_num_open_ports in close%d:in port%d",
1214 port0->open_ports, port->number);
1215 if (port0->open_ports == 0) {
1216 if (serial->port[0]->interrupt_in_urb) {
1217 dbg("%s", "Shutdown interrupt_in_urb");
1218 usb_kill_urb(serial->port[0]->interrupt_in_urb);
1219 }
1220 }
1221
1222 if (mos7840_port->write_urb) {
1223 /* if this urb had a transfer buffer already (old tx) free it */
1224 if (mos7840_port->write_urb->transfer_buffer != NULL)
1225 kfree(mos7840_port->write_urb->transfer_buffer);
1226 usb_free_urb(mos7840_port->write_urb);
1227 }
1228
1229 Data = 0x0;
1230 mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER, Data);
1231
1232 Data = 0x00;
1233 mos7840_set_uart_reg(port, INTERRUPT_ENABLE_REGISTER, Data);
1234
1235 mos7840_port->open = 0;
1236
1237 dbg("%s", "Leaving ............");
1238 }
1239
1240 /************************************************************************
1241 *
1242 * mos7840_block_until_chase_response
1243 *
1244 * This function will block the close until one of the following:
1245 * 1. Response to our Chase comes from mos7840
1246 * 2. A timeout of 10 seconds without activity has expired
1247 * (1K of mos7840 data @ 2400 baud ==> 4 sec to empty)
1248 *
1249 ************************************************************************/
1250
1251 static void mos7840_block_until_chase_response(struct tty_struct *tty,
1252 struct moschip_port *mos7840_port)
1253 {
1254 int timeout = 1 * HZ;
1255 int wait = 10;
1256 int count;
1257
1258 while (1) {
1259 count = mos7840_chars_in_buffer(tty);
1260
1261 /* Check for Buffer status */
1262 if (count <= 0)
1263 return;
1264
1265 /* Block the thread for a while */
1266 interruptible_sleep_on_timeout(&mos7840_port->wait_chase,
1267 timeout);
1268 /* No activity.. count down section */
1269 wait--;
1270 if (wait == 0) {
1271 dbg("%s - TIMEOUT", __func__);
1272 return;
1273 } else {
1274 /* Reset timeout value back to seconds */
1275 wait = 10;
1276 }
1277 }
1278
1279 }
1280
1281 /*****************************************************************************
1282 * mos7840_break
1283 * this function sends a break to the port
1284 *****************************************************************************/
1285 static void mos7840_break(struct tty_struct *tty, int break_state)
1286 {
1287 struct usb_serial_port *port = tty->driver_data;
1288 unsigned char data;
1289 struct usb_serial *serial;
1290 struct moschip_port *mos7840_port;
1291
1292 dbg("%s", "Entering ...........");
1293 dbg("mos7840_break: Start");
1294
1295 if (mos7840_port_paranoia_check(port, __func__)) {
1296 dbg("%s", "Port Paranoia failed");
1297 return;
1298 }
1299
1300 serial = mos7840_get_usb_serial(port, __func__);
1301 if (!serial) {
1302 dbg("%s", "Serial Paranoia failed");
1303 return;
1304 }
1305
1306 mos7840_port = mos7840_get_port_private(port);
1307
1308 if (mos7840_port == NULL)
1309 return;
1310
1311 if (serial->dev)
1312 /* flush and block until tx is empty */
1313 mos7840_block_until_chase_response(tty, mos7840_port);
1314
1315 if (break_state == -1)
1316 data = mos7840_port->shadowLCR | LCR_SET_BREAK;
1317 else
1318 data = mos7840_port->shadowLCR & ~LCR_SET_BREAK;
1319
1320 /* FIXME: no locking on shadowLCR anywhere in driver */
1321 mos7840_port->shadowLCR = data;
1322 dbg("mcs7840_break mos7840_port->shadowLCR is %x",
1323 mos7840_port->shadowLCR);
1324 mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER,
1325 mos7840_port->shadowLCR);
1326
1327 return;
1328 }
1329
1330 /*****************************************************************************
1331 * mos7840_write_room
1332 * this function is called by the tty driver when it wants to know how many
1333 * bytes of data we can accept for a specific port.
1334 * If successful, we return the amount of room that we have for this port
1335 * Otherwise we return a negative error number.
1336 *****************************************************************************/
1337
1338 static int mos7840_write_room(struct tty_struct *tty)
1339 {
1340 struct usb_serial_port *port = tty->driver_data;
1341 int i;
1342 int room = 0;
1343 unsigned long flags;
1344 struct moschip_port *mos7840_port;
1345
1346 dbg("%s", " mos7840_write_room:entering ...........");
1347
1348 if (mos7840_port_paranoia_check(port, __func__)) {
1349 dbg("%s", "Invalid port");
1350 dbg("%s", " mos7840_write_room:leaving ...........");
1351 return -1;
1352 }
1353
1354 mos7840_port = mos7840_get_port_private(port);
1355 if (mos7840_port == NULL) {
1356 dbg("%s", "mos7840_break:leaving ...........");
1357 return -1;
1358 }
1359
1360 spin_lock_irqsave(&mos7840_port->pool_lock, flags);
1361 for (i = 0; i < NUM_URBS; ++i) {
1362 if (!mos7840_port->busy[i])
1363 room += URB_TRANSFER_BUFFER_SIZE;
1364 }
1365 spin_unlock_irqrestore(&mos7840_port->pool_lock, flags);
1366
1367 room = (room == 0) ? 0 : room - URB_TRANSFER_BUFFER_SIZE + 1;
1368 dbg("%s - returns %d", __func__, room);
1369 return room;
1370
1371 }
1372
1373 /*****************************************************************************
1374 * mos7840_write
1375 * this function is called by the tty driver when data should be written to
1376 * the port.
1377 * If successful, we return the number of bytes written, otherwise we
1378 * return a negative error number.
1379 *****************************************************************************/
1380
1381 static int mos7840_write(struct tty_struct *tty, struct usb_serial_port *port,
1382 const unsigned char *data, int count)
1383 {
1384 int status;
1385 int i;
1386 int bytes_sent = 0;
1387 int transfer_size;
1388 unsigned long flags;
1389
1390 struct moschip_port *mos7840_port;
1391 struct usb_serial *serial;
1392 struct urb *urb;
1393 /* __u16 Data; */
1394 const unsigned char *current_position = data;
1395 unsigned char *data1;
1396 dbg("%s", "entering ...........");
1397 /* dbg("mos7840_write: mos7840_port->shadowLCR is %x",
1398 mos7840_port->shadowLCR); */
1399
1400 #ifdef NOTMOS7840
1401 Data = 0x00;
1402 status = mos7840_get_uart_reg(port, LINE_CONTROL_REGISTER, &Data);
1403 mos7840_port->shadowLCR = Data;
1404 dbg("mos7840_write: LINE_CONTROL_REGISTER is %x", Data);
1405 dbg("mos7840_write: mos7840_port->shadowLCR is %x",
1406 mos7840_port->shadowLCR);
1407
1408 /* Data = 0x03; */
1409 /* status = mos7840_set_uart_reg(port,LINE_CONTROL_REGISTER,Data); */
1410 /* mos7840_port->shadowLCR=Data;//Need to add later */
1411
1412 Data |= SERIAL_LCR_DLAB; /* data latch enable in LCR 0x80 */
1413 status = mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data);
1414
1415 /* Data = 0x0c; */
1416 /* status = mos7840_set_uart_reg(port,DIVISOR_LATCH_LSB,Data); */
1417 Data = 0x00;
1418 status = mos7840_get_uart_reg(port, DIVISOR_LATCH_LSB, &Data);
1419 dbg("mos7840_write:DLL value is %x", Data);
1420
1421 Data = 0x0;
1422 status = mos7840_get_uart_reg(port, DIVISOR_LATCH_MSB, &Data);
1423 dbg("mos7840_write:DLM value is %x", Data);
1424
1425 Data = Data & ~SERIAL_LCR_DLAB;
1426 dbg("mos7840_write: mos7840_port->shadowLCR is %x",
1427 mos7840_port->shadowLCR);
1428 status = mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data);
1429 #endif
1430
1431 if (mos7840_port_paranoia_check(port, __func__)) {
1432 dbg("%s", "Port Paranoia failed");
1433 return -1;
1434 }
1435
1436 serial = port->serial;
1437 if (mos7840_serial_paranoia_check(serial, __func__)) {
1438 dbg("%s", "Serial Paranoia failed");
1439 return -1;
1440 }
1441
1442 mos7840_port = mos7840_get_port_private(port);
1443 if (mos7840_port == NULL) {
1444 dbg("%s", "mos7840_port is NULL");
1445 return -1;
1446 }
1447
1448 /* try to find a free urb in the list */
1449 urb = NULL;
1450
1451 spin_lock_irqsave(&mos7840_port->pool_lock, flags);
1452 for (i = 0; i < NUM_URBS; ++i) {
1453 if (!mos7840_port->busy[i]) {
1454 mos7840_port->busy[i] = 1;
1455 urb = mos7840_port->write_urb_pool[i];
1456 dbg("URB:%d", i);
1457 break;
1458 }
1459 }
1460 spin_unlock_irqrestore(&mos7840_port->pool_lock, flags);
1461
1462 if (urb == NULL) {
1463 dbg("%s - no more free urbs", __func__);
1464 goto exit;
1465 }
1466
1467 if (urb->transfer_buffer == NULL) {
1468 urb->transfer_buffer =
1469 kmalloc(URB_TRANSFER_BUFFER_SIZE, GFP_KERNEL);
1470
1471 if (urb->transfer_buffer == NULL) {
1472 dev_err(&port->dev, "%s no more kernel memory...\n",
1473 __func__);
1474 goto exit;
1475 }
1476 }
1477 transfer_size = min(count, URB_TRANSFER_BUFFER_SIZE);
1478
1479 memcpy(urb->transfer_buffer, current_position, transfer_size);
1480
1481 /* fill urb with data and submit */
1482 usb_fill_bulk_urb(urb,
1483 serial->dev,
1484 usb_sndbulkpipe(serial->dev,
1485 port->bulk_out_endpointAddress),
1486 urb->transfer_buffer,
1487 transfer_size,
1488 mos7840_bulk_out_data_callback, mos7840_port);
1489
1490 data1 = urb->transfer_buffer;
1491 dbg("bulkout endpoint is %d", port->bulk_out_endpointAddress);
1492
1493 /* send it down the pipe */
1494 status = usb_submit_urb(urb, GFP_ATOMIC);
1495
1496 if (status) {
1497 mos7840_port->busy[i] = 0;
1498 dev_err(&port->dev, "%s - usb_submit_urb(write bulk) failed "
1499 "with status = %d\n", __func__, status);
1500 bytes_sent = status;
1501 goto exit;
1502 }
1503 bytes_sent = transfer_size;
1504 mos7840_port->icount.tx += transfer_size;
1505 smp_wmb();
1506 dbg("mos7840_port->icount.tx is %d:", mos7840_port->icount.tx);
1507 exit:
1508 return bytes_sent;
1509
1510 }
1511
1512 /*****************************************************************************
1513 * mos7840_throttle
1514 * this function is called by the tty driver when it wants to stop the data
1515 * being read from the port.
1516 *****************************************************************************/
1517
1518 static void mos7840_throttle(struct tty_struct *tty)
1519 {
1520 struct usb_serial_port *port = tty->driver_data;
1521 struct moschip_port *mos7840_port;
1522 int status;
1523
1524 if (mos7840_port_paranoia_check(port, __func__)) {
1525 dbg("%s", "Invalid port");
1526 return;
1527 }
1528
1529 dbg("- port %d", port->number);
1530
1531 mos7840_port = mos7840_get_port_private(port);
1532
1533 if (mos7840_port == NULL)
1534 return;
1535
1536 if (!mos7840_port->open) {
1537 dbg("%s", "port not opened");
1538 return;
1539 }
1540
1541 dbg("%s", "Entering ..........");
1542
1543 /* if we are implementing XON/XOFF, send the stop character */
1544 if (I_IXOFF(tty)) {
1545 unsigned char stop_char = STOP_CHAR(tty);
1546 status = mos7840_write(tty, port, &stop_char, 1);
1547 if (status <= 0)
1548 return;
1549 }
1550 /* if we are implementing RTS/CTS, toggle that line */
1551 if (tty->termios->c_cflag & CRTSCTS) {
1552 mos7840_port->shadowMCR &= ~MCR_RTS;
1553 status = mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER,
1554 mos7840_port->shadowMCR);
1555 if (status < 0)
1556 return;
1557 }
1558
1559 return;
1560 }
1561
1562 /*****************************************************************************
1563 * mos7840_unthrottle
1564 * this function is called by the tty driver when it wants to resume
1565 * the data being read from the port (called after mos7840_throttle is
1566 * called)
1567 *****************************************************************************/
1568 static void mos7840_unthrottle(struct tty_struct *tty)
1569 {
1570 struct usb_serial_port *port = tty->driver_data;
1571 int status;
1572 struct moschip_port *mos7840_port = mos7840_get_port_private(port);
1573
1574 if (mos7840_port_paranoia_check(port, __func__)) {
1575 dbg("%s", "Invalid port");
1576 return;
1577 }
1578
1579 if (mos7840_port == NULL)
1580 return;
1581
1582 if (!mos7840_port->open) {
1583 dbg("%s - port not opened", __func__);
1584 return;
1585 }
1586
1587 dbg("%s", "Entering ..........");
1588
1589 /* if we are implementing XON/XOFF, send the start character */
1590 if (I_IXOFF(tty)) {
1591 unsigned char start_char = START_CHAR(tty);
1592 status = mos7840_write(tty, port, &start_char, 1);
1593 if (status <= 0)
1594 return;
1595 }
1596
1597 /* if we are implementing RTS/CTS, toggle that line */
1598 if (tty->termios->c_cflag & CRTSCTS) {
1599 mos7840_port->shadowMCR |= MCR_RTS;
1600 status = mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER,
1601 mos7840_port->shadowMCR);
1602 if (status < 0)
1603 return;
1604 }
1605 }
1606
1607 static int mos7840_tiocmget(struct tty_struct *tty, struct file *file)
1608 {
1609 struct usb_serial_port *port = tty->driver_data;
1610 struct moschip_port *mos7840_port;
1611 unsigned int result;
1612 __u16 msr;
1613 __u16 mcr;
1614 int status;
1615 mos7840_port = mos7840_get_port_private(port);
1616
1617 dbg("%s - port %d", __func__, port->number);
1618
1619 if (mos7840_port == NULL)
1620 return -ENODEV;
1621
1622 status = mos7840_get_uart_reg(port, MODEM_STATUS_REGISTER, &msr);
1623 status = mos7840_get_uart_reg(port, MODEM_CONTROL_REGISTER, &mcr);
1624 result = ((mcr & MCR_DTR) ? TIOCM_DTR : 0)
1625 | ((mcr & MCR_RTS) ? TIOCM_RTS : 0)
1626 | ((mcr & MCR_LOOPBACK) ? TIOCM_LOOP : 0)
1627 | ((msr & MOS7840_MSR_CTS) ? TIOCM_CTS : 0)
1628 | ((msr & MOS7840_MSR_CD) ? TIOCM_CAR : 0)
1629 | ((msr & MOS7840_MSR_RI) ? TIOCM_RI : 0)
1630 | ((msr & MOS7840_MSR_DSR) ? TIOCM_DSR : 0);
1631
1632 dbg("%s - 0x%04X", __func__, result);
1633
1634 return result;
1635 }
1636
1637 static int mos7840_tiocmset(struct tty_struct *tty, struct file *file,
1638 unsigned int set, unsigned int clear)
1639 {
1640 struct usb_serial_port *port = tty->driver_data;
1641 struct moschip_port *mos7840_port;
1642 unsigned int mcr;
1643 int status;
1644
1645 dbg("%s - port %d", __func__, port->number);
1646
1647 mos7840_port = mos7840_get_port_private(port);
1648
1649 if (mos7840_port == NULL)
1650 return -ENODEV;
1651
1652 /* FIXME: What locks the port registers ? */
1653 mcr = mos7840_port->shadowMCR;
1654 if (clear & TIOCM_RTS)
1655 mcr &= ~MCR_RTS;
1656 if (clear & TIOCM_DTR)
1657 mcr &= ~MCR_DTR;
1658 if (clear & TIOCM_LOOP)
1659 mcr &= ~MCR_LOOPBACK;
1660
1661 if (set & TIOCM_RTS)
1662 mcr |= MCR_RTS;
1663 if (set & TIOCM_DTR)
1664 mcr |= MCR_DTR;
1665 if (set & TIOCM_LOOP)
1666 mcr |= MCR_LOOPBACK;
1667
1668 mos7840_port->shadowMCR = mcr;
1669
1670 status = mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER, mcr);
1671 if (status < 0) {
1672 dbg("setting MODEM_CONTROL_REGISTER Failed");
1673 return status;
1674 }
1675
1676 return 0;
1677 }
1678
1679 /*****************************************************************************
1680 * mos7840_calc_baud_rate_divisor
1681 * this function calculates the proper baud rate divisor for the specified
1682 * baud rate.
1683 *****************************************************************************/
1684 static int mos7840_calc_baud_rate_divisor(int baudRate, int *divisor,
1685 __u16 *clk_sel_val)
1686 {
1687
1688 dbg("%s - %d", __func__, baudRate);
1689
1690 if (baudRate <= 115200) {
1691 *divisor = 115200 / baudRate;
1692 *clk_sel_val = 0x0;
1693 }
1694 if ((baudRate > 115200) && (baudRate <= 230400)) {
1695 *divisor = 230400 / baudRate;
1696 *clk_sel_val = 0x10;
1697 } else if ((baudRate > 230400) && (baudRate <= 403200)) {
1698 *divisor = 403200 / baudRate;
1699 *clk_sel_val = 0x20;
1700 } else if ((baudRate > 403200) && (baudRate <= 460800)) {
1701 *divisor = 460800 / baudRate;
1702 *clk_sel_val = 0x30;
1703 } else if ((baudRate > 460800) && (baudRate <= 806400)) {
1704 *divisor = 806400 / baudRate;
1705 *clk_sel_val = 0x40;
1706 } else if ((baudRate > 806400) && (baudRate <= 921600)) {
1707 *divisor = 921600 / baudRate;
1708 *clk_sel_val = 0x50;
1709 } else if ((baudRate > 921600) && (baudRate <= 1572864)) {
1710 *divisor = 1572864 / baudRate;
1711 *clk_sel_val = 0x60;
1712 } else if ((baudRate > 1572864) && (baudRate <= 3145728)) {
1713 *divisor = 3145728 / baudRate;
1714 *clk_sel_val = 0x70;
1715 }
1716 return 0;
1717
1718 #ifdef NOTMCS7840
1719
1720 for (i = 0; i < ARRAY_SIZE(mos7840_divisor_table); i++) {
1721 if (mos7840_divisor_table[i].BaudRate == baudrate) {
1722 *divisor = mos7840_divisor_table[i].Divisor;
1723 return 0;
1724 }
1725 }
1726
1727 /* After trying for all the standard baud rates *
1728 * Try calculating the divisor for this baud rate */
1729
1730 if (baudrate > 75 && baudrate < 230400) {
1731 /* get the divisor */
1732 custom = (__u16) (230400L / baudrate);
1733
1734 /* Check for round off */
1735 round1 = (__u16) (2304000L / baudrate);
1736 round = (__u16) (round1 - (custom * 10));
1737 if (round > 4)
1738 custom++;
1739 *divisor = custom;
1740
1741 dbg(" Baud %d = %d", baudrate, custom);
1742 return 0;
1743 }
1744
1745 dbg("%s", " Baud calculation Failed...");
1746 return -1;
1747 #endif
1748 }
1749
1750 /*****************************************************************************
1751 * mos7840_send_cmd_write_baud_rate
1752 * this function sends the proper command to change the baud rate of the
1753 * specified port.
1754 *****************************************************************************/
1755
1756 static int mos7840_send_cmd_write_baud_rate(struct moschip_port *mos7840_port,
1757 int baudRate)
1758 {
1759 int divisor = 0;
1760 int status;
1761 __u16 Data;
1762 unsigned char number;
1763 __u16 clk_sel_val;
1764 struct usb_serial_port *port;
1765
1766 if (mos7840_port == NULL)
1767 return -1;
1768
1769 port = (struct usb_serial_port *)mos7840_port->port;
1770 if (mos7840_port_paranoia_check(port, __func__)) {
1771 dbg("%s", "Invalid port");
1772 return -1;
1773 }
1774
1775 if (mos7840_serial_paranoia_check(port->serial, __func__)) {
1776 dbg("%s", "Invalid Serial");
1777 return -1;
1778 }
1779
1780 dbg("%s", "Entering ..........");
1781
1782 number = mos7840_port->port->number - mos7840_port->port->serial->minor;
1783
1784 dbg("%s - port = %d, baud = %d", __func__,
1785 mos7840_port->port->number, baudRate);
1786 /* reset clk_uart_sel in spregOffset */
1787 if (baudRate > 115200) {
1788 #ifdef HW_flow_control
1789 /* NOTE: need to see the pther register to modify */
1790 /* setting h/w flow control bit to 1 */
1791 Data = 0x2b;
1792 mos7840_port->shadowMCR = Data;
1793 status = mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER,
1794 Data);
1795 if (status < 0) {
1796 dbg("Writing spreg failed in set_serial_baud");
1797 return -1;
1798 }
1799 #endif
1800
1801 } else {
1802 #ifdef HW_flow_control
1803 / *setting h/w flow control bit to 0 */
1804 Data = 0xb;
1805 mos7840_port->shadowMCR = Data;
1806 status = mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER,
1807 Data);
1808 if (status < 0) {
1809 dbg("Writing spreg failed in set_serial_baud");
1810 return -1;
1811 }
1812 #endif
1813
1814 }
1815
1816 if (1) { /* baudRate <= 115200) */
1817 clk_sel_val = 0x0;
1818 Data = 0x0;
1819 status = mos7840_calc_baud_rate_divisor(baudRate, &divisor,
1820 &clk_sel_val);
1821 status = mos7840_get_reg_sync(port, mos7840_port->SpRegOffset,
1822 &Data);
1823 if (status < 0) {
1824 dbg("reading spreg failed in set_serial_baud");
1825 return -1;
1826 }
1827 Data = (Data & 0x8f) | clk_sel_val;
1828 status = mos7840_set_reg_sync(port, mos7840_port->SpRegOffset,
1829 Data);
1830 if (status < 0) {
1831 dbg("Writing spreg failed in set_serial_baud");
1832 return -1;
1833 }
1834 /* Calculate the Divisor */
1835
1836 if (status) {
1837 dev_err(&port->dev, "%s - bad baud rate\n", __func__);
1838 return status;
1839 }
1840 /* Enable access to divisor latch */
1841 Data = mos7840_port->shadowLCR | SERIAL_LCR_DLAB;
1842 mos7840_port->shadowLCR = Data;
1843 mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data);
1844
1845 /* Write the divisor */
1846 Data = (unsigned char)(divisor & 0xff);
1847 dbg("set_serial_baud Value to write DLL is %x", Data);
1848 mos7840_set_uart_reg(port, DIVISOR_LATCH_LSB, Data);
1849
1850 Data = (unsigned char)((divisor & 0xff00) >> 8);
1851 dbg("set_serial_baud Value to write DLM is %x", Data);
1852 mos7840_set_uart_reg(port, DIVISOR_LATCH_MSB, Data);
1853
1854 /* Disable access to divisor latch */
1855 Data = mos7840_port->shadowLCR & ~SERIAL_LCR_DLAB;
1856 mos7840_port->shadowLCR = Data;
1857 mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data);
1858
1859 }
1860 return status;
1861 }
1862
1863 /*****************************************************************************
1864 * mos7840_change_port_settings
1865 * This routine is called to set the UART on the device to match
1866 * the specified new settings.
1867 *****************************************************************************/
1868
1869 static void mos7840_change_port_settings(struct tty_struct *tty,
1870 struct moschip_port *mos7840_port, struct ktermios *old_termios)
1871 {
1872 int baud;
1873 unsigned cflag;
1874 unsigned iflag;
1875 __u8 lData;
1876 __u8 lParity;
1877 __u8 lStop;
1878 int status;
1879 __u16 Data;
1880 struct usb_serial_port *port;
1881 struct usb_serial *serial;
1882
1883 if (mos7840_port == NULL)
1884 return;
1885
1886 port = (struct usb_serial_port *)mos7840_port->port;
1887
1888 if (mos7840_port_paranoia_check(port, __func__)) {
1889 dbg("%s", "Invalid port");
1890 return;
1891 }
1892
1893 if (mos7840_serial_paranoia_check(port->serial, __func__)) {
1894 dbg("%s", "Invalid Serial");
1895 return;
1896 }
1897
1898 serial = port->serial;
1899
1900 dbg("%s - port %d", __func__, mos7840_port->port->number);
1901
1902 if (!mos7840_port->open) {
1903 dbg("%s - port not opened", __func__);
1904 return;
1905 }
1906
1907 dbg("%s", "Entering ..........");
1908
1909 lData = LCR_BITS_8;
1910 lStop = LCR_STOP_1;
1911 lParity = LCR_PAR_NONE;
1912
1913 cflag = tty->termios->c_cflag;
1914 iflag = tty->termios->c_iflag;
1915
1916 /* Change the number of bits */
1917 if (cflag & CSIZE) {
1918 switch (cflag & CSIZE) {
1919 case CS5:
1920 lData = LCR_BITS_5;
1921 break;
1922
1923 case CS6:
1924 lData = LCR_BITS_6;
1925 break;
1926
1927 case CS7:
1928 lData = LCR_BITS_7;
1929 break;
1930 default:
1931 case CS8:
1932 lData = LCR_BITS_8;
1933 break;
1934 }
1935 }
1936 /* Change the Parity bit */
1937 if (cflag & PARENB) {
1938 if (cflag & PARODD) {
1939 lParity = LCR_PAR_ODD;
1940 dbg("%s - parity = odd", __func__);
1941 } else {
1942 lParity = LCR_PAR_EVEN;
1943 dbg("%s - parity = even", __func__);
1944 }
1945
1946 } else {
1947 dbg("%s - parity = none", __func__);
1948 }
1949
1950 if (cflag & CMSPAR)
1951 lParity = lParity | 0x20;
1952
1953 /* Change the Stop bit */
1954 if (cflag & CSTOPB) {
1955 lStop = LCR_STOP_2;
1956 dbg("%s - stop bits = 2", __func__);
1957 } else {
1958 lStop = LCR_STOP_1;
1959 dbg("%s - stop bits = 1", __func__);
1960 }
1961
1962 /* Update the LCR with the correct value */
1963 mos7840_port->shadowLCR &=
1964 ~(LCR_BITS_MASK | LCR_STOP_MASK | LCR_PAR_MASK);
1965 mos7840_port->shadowLCR |= (lData | lParity | lStop);
1966
1967 dbg("mos7840_change_port_settings mos7840_port->shadowLCR is %x",
1968 mos7840_port->shadowLCR);
1969 /* Disable Interrupts */
1970 Data = 0x00;
1971 mos7840_set_uart_reg(port, INTERRUPT_ENABLE_REGISTER, Data);
1972
1973 Data = 0x00;
1974 mos7840_set_uart_reg(port, FIFO_CONTROL_REGISTER, Data);
1975
1976 Data = 0xcf;
1977 mos7840_set_uart_reg(port, FIFO_CONTROL_REGISTER, Data);
1978
1979 /* Send the updated LCR value to the mos7840 */
1980 Data = mos7840_port->shadowLCR;
1981
1982 mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data);
1983
1984 Data = 0x00b;
1985 mos7840_port->shadowMCR = Data;
1986 mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER, Data);
1987 Data = 0x00b;
1988 mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER, Data);
1989
1990 /* set up the MCR register and send it to the mos7840 */
1991
1992 mos7840_port->shadowMCR = MCR_MASTER_IE;
1993 if (cflag & CBAUD)
1994 mos7840_port->shadowMCR |= (MCR_DTR | MCR_RTS);
1995
1996 if (cflag & CRTSCTS)
1997 mos7840_port->shadowMCR |= (MCR_XON_ANY);
1998 else
1999 mos7840_port->shadowMCR &= ~(MCR_XON_ANY);
2000
2001 Data = mos7840_port->shadowMCR;
2002 mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER, Data);
2003
2004 /* Determine divisor based on baud rate */
2005 baud = tty_get_baud_rate(tty);
2006
2007 if (!baud) {
2008 /* pick a default, any default... */
2009 dbg("%s", "Picked default baud...");
2010 baud = 9600;
2011 }
2012
2013 dbg("%s - baud rate = %d", __func__, baud);
2014 status = mos7840_send_cmd_write_baud_rate(mos7840_port, baud);
2015
2016 /* Enable Interrupts */
2017 Data = 0x0c;
2018 mos7840_set_uart_reg(port, INTERRUPT_ENABLE_REGISTER, Data);
2019
2020 if (mos7840_port->read_urb_busy == false) {
2021 mos7840_port->read_urb->dev = serial->dev;
2022 mos7840_port->read_urb_busy = true;
2023 status = usb_submit_urb(mos7840_port->read_urb, GFP_ATOMIC);
2024 if (status) {
2025 dbg("usb_submit_urb(read bulk) failed, status = %d",
2026 status);
2027 mos7840_port->read_urb_busy = false;
2028 }
2029 }
2030 wake_up(&mos7840_port->delta_msr_wait);
2031 mos7840_port->delta_msr_cond = 1;
2032 dbg("mos7840_change_port_settings mos7840_port->shadowLCR is End %x",
2033 mos7840_port->shadowLCR);
2034
2035 return;
2036 }
2037
2038 /*****************************************************************************
2039 * mos7840_set_termios
2040 * this function is called by the tty driver when it wants to change
2041 * the termios structure
2042 *****************************************************************************/
2043
2044 static void mos7840_set_termios(struct tty_struct *tty,
2045 struct usb_serial_port *port,
2046 struct ktermios *old_termios)
2047 {
2048 int status;
2049 unsigned int cflag;
2050 struct usb_serial *serial;
2051 struct moschip_port *mos7840_port;
2052 dbg("mos7840_set_termios: START");
2053 if (mos7840_port_paranoia_check(port, __func__)) {
2054 dbg("%s", "Invalid port");
2055 return;
2056 }
2057
2058 serial = port->serial;
2059
2060 if (mos7840_serial_paranoia_check(serial, __func__)) {
2061 dbg("%s", "Invalid Serial");
2062 return;
2063 }
2064
2065 mos7840_port = mos7840_get_port_private(port);
2066
2067 if (mos7840_port == NULL)
2068 return;
2069
2070 if (!mos7840_port->open) {
2071 dbg("%s - port not opened", __func__);
2072 return;
2073 }
2074
2075 dbg("%s", "setting termios - ");
2076
2077 cflag = tty->termios->c_cflag;
2078
2079 dbg("%s - clfag %08x iflag %08x", __func__,
2080 tty->termios->c_cflag, RELEVANT_IFLAG(tty->termios->c_iflag));
2081 dbg("%s - old clfag %08x old iflag %08x", __func__,
2082 old_termios->c_cflag, RELEVANT_IFLAG(old_termios->c_iflag));
2083 dbg("%s - port %d", __func__, port->number);
2084
2085 /* change the port settings to the new ones specified */
2086
2087 mos7840_change_port_settings(tty, mos7840_port, old_termios);
2088
2089 if (!mos7840_port->read_urb) {
2090 dbg("%s", "URB KILLED !!!!!");
2091 return;
2092 }
2093
2094 if (mos7840_port->read_urb_busy == false) {
2095 mos7840_port->read_urb->dev = serial->dev;
2096 mos7840_port->read_urb_busy = true;
2097 status = usb_submit_urb(mos7840_port->read_urb, GFP_ATOMIC);
2098 if (status) {
2099 dbg("usb_submit_urb(read bulk) failed, status = %d",
2100 status);
2101 mos7840_port->read_urb_busy = false;
2102 }
2103 }
2104 return;
2105 }
2106
2107 /*****************************************************************************
2108 * mos7840_get_lsr_info - get line status register info
2109 *
2110 * Purpose: Let user call ioctl() to get info when the UART physically
2111 * is emptied. On bus types like RS485, the transmitter must
2112 * release the bus after transmitting. This must be done when
2113 * the transmit shift register is empty, not be done when the
2114 * transmit holding register is empty. This functionality
2115 * allows an RS485 driver to be written in user space.
2116 *****************************************************************************/
2117
2118 static int mos7840_get_lsr_info(struct tty_struct *tty,
2119 unsigned int __user *value)
2120 {
2121 int count;
2122 unsigned int result = 0;
2123
2124 count = mos7840_chars_in_buffer(tty);
2125 if (count == 0) {
2126 dbg("%s -- Empty", __func__);
2127 result = TIOCSER_TEMT;
2128 }
2129
2130 if (copy_to_user(value, &result, sizeof(int)))
2131 return -EFAULT;
2132 return 0;
2133 }
2134
2135 /*****************************************************************************
2136 * mos7840_get_serial_info
2137 * function to get information about serial port
2138 *****************************************************************************/
2139
2140 static int mos7840_get_serial_info(struct moschip_port *mos7840_port,
2141 struct serial_struct __user *retinfo)
2142 {
2143 struct serial_struct tmp;
2144
2145 if (mos7840_port == NULL)
2146 return -1;
2147
2148 if (!retinfo)
2149 return -EFAULT;
2150
2151 memset(&tmp, 0, sizeof(tmp));
2152
2153 tmp.type = PORT_16550A;
2154 tmp.line = mos7840_port->port->serial->minor;
2155 tmp.port = mos7840_port->port->number;
2156 tmp.irq = 0;
2157 tmp.flags = ASYNC_SKIP_TEST | ASYNC_AUTO_IRQ;
2158 tmp.xmit_fifo_size = NUM_URBS * URB_TRANSFER_BUFFER_SIZE;
2159 tmp.baud_base = 9600;
2160 tmp.close_delay = 5 * HZ;
2161 tmp.closing_wait = 30 * HZ;
2162
2163 if (copy_to_user(retinfo, &tmp, sizeof(*retinfo)))
2164 return -EFAULT;
2165 return 0;
2166 }
2167
2168 /*****************************************************************************
2169 * SerialIoctl
2170 * this function handles any ioctl calls to the driver
2171 *****************************************************************************/
2172
2173 static int mos7840_ioctl(struct tty_struct *tty, struct file *file,
2174 unsigned int cmd, unsigned long arg)
2175 {
2176 struct usb_serial_port *port = tty->driver_data;
2177 void __user *argp = (void __user *)arg;
2178 struct moschip_port *mos7840_port;
2179
2180 struct async_icount cnow;
2181 struct async_icount cprev;
2182 struct serial_icounter_struct icount;
2183
2184 if (mos7840_port_paranoia_check(port, __func__)) {
2185 dbg("%s", "Invalid port");
2186 return -1;
2187 }
2188
2189 mos7840_port = mos7840_get_port_private(port);
2190
2191 if (mos7840_port == NULL)
2192 return -1;
2193
2194 dbg("%s - port %d, cmd = 0x%x", __func__, port->number, cmd);
2195
2196 switch (cmd) {
2197 /* return number of bytes available */
2198
2199 case TIOCSERGETLSR:
2200 dbg("%s (%d) TIOCSERGETLSR", __func__, port->number);
2201 return mos7840_get_lsr_info(tty, argp);
2202 return 0;
2203
2204 case TIOCGSERIAL:
2205 dbg("%s (%d) TIOCGSERIAL", __func__, port->number);
2206 return mos7840_get_serial_info(mos7840_port, argp);
2207
2208 case TIOCSSERIAL:
2209 dbg("%s (%d) TIOCSSERIAL", __func__, port->number);
2210 break;
2211
2212 case TIOCMIWAIT:
2213 dbg("%s (%d) TIOCMIWAIT", __func__, port->number);
2214 cprev = mos7840_port->icount;
2215 while (1) {
2216 /* interruptible_sleep_on(&mos7840_port->delta_msr_wait); */
2217 mos7840_port->delta_msr_cond = 0;
2218 wait_event_interruptible(mos7840_port->delta_msr_wait,
2219 (mos7840_port->
2220 delta_msr_cond == 1));
2221
2222 /* see if a signal did it */
2223 if (signal_pending(current))
2224 return -ERESTARTSYS;
2225 cnow = mos7840_port->icount;
2226 smp_rmb();
2227 if (cnow.rng == cprev.rng && cnow.dsr == cprev.dsr &&
2228 cnow.dcd == cprev.dcd && cnow.cts == cprev.cts)
2229 return -EIO; /* no change => error */
2230 if (((arg & TIOCM_RNG) && (cnow.rng != cprev.rng)) ||
2231 ((arg & TIOCM_DSR) && (cnow.dsr != cprev.dsr)) ||
2232 ((arg & TIOCM_CD) && (cnow.dcd != cprev.dcd)) ||
2233 ((arg & TIOCM_CTS) && (cnow.cts != cprev.cts))) {
2234 return 0;
2235 }
2236 cprev = cnow;
2237 }
2238 /* NOTREACHED */
2239 break;
2240
2241 case TIOCGICOUNT:
2242 cnow = mos7840_port->icount;
2243 smp_rmb();
2244 icount.cts = cnow.cts;
2245 icount.dsr = cnow.dsr;
2246 icount.rng = cnow.rng;
2247 icount.dcd = cnow.dcd;
2248 icount.rx = cnow.rx;
2249 icount.tx = cnow.tx;
2250 icount.frame = cnow.frame;
2251 icount.overrun = cnow.overrun;
2252 icount.parity = cnow.parity;
2253 icount.brk = cnow.brk;
2254 icount.buf_overrun = cnow.buf_overrun;
2255
2256 dbg("%s (%d) TIOCGICOUNT RX=%d, TX=%d", __func__,
2257 port->number, icount.rx, icount.tx);
2258 if (copy_to_user(argp, &icount, sizeof(icount)))
2259 return -EFAULT;
2260 return 0;
2261 default:
2262 break;
2263 }
2264 return -ENOIOCTLCMD;
2265 }
2266
2267 static int mos7840_calc_num_ports(struct usb_serial *serial)
2268 {
2269 int mos7840_num_ports = 0;
2270
2271 dbg("numberofendpoints: cur %d, alt %d",
2272 (int)serial->interface->cur_altsetting->desc.bNumEndpoints,
2273 (int)serial->interface->altsetting->desc.bNumEndpoints);
2274 if (serial->interface->cur_altsetting->desc.bNumEndpoints == 5) {
2275 mos7840_num_ports = serial->num_ports = 2;
2276 } else if (serial->interface->cur_altsetting->desc.bNumEndpoints == 9) {
2277 serial->num_bulk_in = 4;
2278 serial->num_bulk_out = 4;
2279 mos7840_num_ports = serial->num_ports = 4;
2280 }
2281 dbg ("mos7840_num_ports = %d", mos7840_num_ports);
2282 return mos7840_num_ports;
2283 }
2284
2285 /****************************************************************************
2286 * mos7840_startup
2287 ****************************************************************************/
2288
2289 static int mos7840_startup(struct usb_serial *serial)
2290 {
2291 struct moschip_port *mos7840_port;
2292 struct usb_device *dev;
2293 int i, status;
2294
2295 __u16 Data;
2296 dbg("%s", "mos7840_startup :Entering..........");
2297
2298 if (!serial) {
2299 dbg("%s", "Invalid Handler");
2300 return -1;
2301 }
2302
2303 dev = serial->dev;
2304
2305 dbg("%s", "Entering...");
2306 dbg ("mos7840_startup: serial = %p", serial);
2307
2308 /* we set up the pointers to the endpoints in the mos7840_open *
2309 * function, as the structures aren't created yet. */
2310
2311 /* set up port private structures */
2312 for (i = 0; i < serial->num_ports; ++i) {
2313 dbg ("mos7840_startup: configuring port %d............", i);
2314 mos7840_port = kzalloc(sizeof(struct moschip_port), GFP_KERNEL);
2315 if (mos7840_port == NULL) {
2316 dev_err(&dev->dev, "%s - Out of memory\n", __func__);
2317 status = -ENOMEM;
2318 i--; /* don't follow NULL pointer cleaning up */
2319 goto error;
2320 }
2321
2322 /* Initialize all port interrupt end point to port 0 int
2323 * endpoint. Our device has only one interrupt end point
2324 * common to all port */
2325
2326 mos7840_port->port = serial->port[i];
2327 mos7840_set_port_private(serial->port[i], mos7840_port);
2328 spin_lock_init(&mos7840_port->pool_lock);
2329
2330 /* minor is not initialised until later by
2331 * usb-serial.c:get_free_serial() and cannot therefore be used
2332 * to index device instances */
2333 mos7840_port->port_num = i + 1;
2334 dbg ("serial->port[i]->number = %d", serial->port[i]->number);
2335 dbg ("serial->port[i]->serial->minor = %d", serial->port[i]->serial->minor);
2336 dbg ("mos7840_port->port_num = %d", mos7840_port->port_num);
2337 dbg ("serial->minor = %d", serial->minor);
2338
2339 if (mos7840_port->port_num == 1) {
2340 mos7840_port->SpRegOffset = 0x0;
2341 mos7840_port->ControlRegOffset = 0x1;
2342 mos7840_port->DcrRegOffset = 0x4;
2343 } else if ((mos7840_port->port_num == 2)
2344 && (serial->num_ports == 4)) {
2345 mos7840_port->SpRegOffset = 0x8;
2346 mos7840_port->ControlRegOffset = 0x9;
2347 mos7840_port->DcrRegOffset = 0x16;
2348 } else if ((mos7840_port->port_num == 2)
2349 && (serial->num_ports == 2)) {
2350 mos7840_port->SpRegOffset = 0xa;
2351 mos7840_port->ControlRegOffset = 0xb;
2352 mos7840_port->DcrRegOffset = 0x19;
2353 } else if ((mos7840_port->port_num == 3)
2354 && (serial->num_ports == 4)) {
2355 mos7840_port->SpRegOffset = 0xa;
2356 mos7840_port->ControlRegOffset = 0xb;
2357 mos7840_port->DcrRegOffset = 0x19;
2358 } else if ((mos7840_port->port_num == 4)
2359 && (serial->num_ports == 4)) {
2360 mos7840_port->SpRegOffset = 0xc;
2361 mos7840_port->ControlRegOffset = 0xd;
2362 mos7840_port->DcrRegOffset = 0x1c;
2363 }
2364 mos7840_dump_serial_port(mos7840_port);
2365 mos7840_set_port_private(serial->port[i], mos7840_port);
2366
2367 /* enable rx_disable bit in control register */
2368 status = mos7840_get_reg_sync(serial->port[i],
2369 mos7840_port->ControlRegOffset, &Data);
2370 if (status < 0) {
2371 dbg("Reading ControlReg failed status-0x%x", status);
2372 break;
2373 } else
2374 dbg("ControlReg Reading success val is %x, status%d",
2375 Data, status);
2376 Data |= 0x08; /* setting driver done bit */
2377 Data |= 0x04; /* sp1_bit to have cts change reflect in
2378 modem status reg */
2379
2380 /* Data |= 0x20; //rx_disable bit */
2381 status = mos7840_set_reg_sync(serial->port[i],
2382 mos7840_port->ControlRegOffset, Data);
2383 if (status < 0) {
2384 dbg("Writing ControlReg failed(rx_disable) status-0x%x", status);
2385 break;
2386 } else
2387 dbg("ControlReg Writing success(rx_disable) status%d",
2388 status);
2389
2390 /* Write default values in DCR (i.e 0x01 in DCR0, 0x05 in DCR2
2391 and 0x24 in DCR3 */
2392 Data = 0x01;
2393 status = mos7840_set_reg_sync(serial->port[i],
2394 (__u16) (mos7840_port->DcrRegOffset + 0), Data);
2395 if (status < 0) {
2396 dbg("Writing DCR0 failed status-0x%x", status);
2397 break;
2398 } else
2399 dbg("DCR0 Writing success status%d", status);
2400
2401 Data = 0x05;
2402 status = mos7840_set_reg_sync(serial->port[i],
2403 (__u16) (mos7840_port->DcrRegOffset + 1), Data);
2404 if (status < 0) {
2405 dbg("Writing DCR1 failed status-0x%x", status);
2406 break;
2407 } else
2408 dbg("DCR1 Writing success status%d", status);
2409
2410 Data = 0x24;
2411 status = mos7840_set_reg_sync(serial->port[i],
2412 (__u16) (mos7840_port->DcrRegOffset + 2), Data);
2413 if (status < 0) {
2414 dbg("Writing DCR2 failed status-0x%x", status);
2415 break;
2416 } else
2417 dbg("DCR2 Writing success status%d", status);
2418
2419 /* write values in clkstart0x0 and clkmulti 0x20 */
2420 Data = 0x0;
2421 status = mos7840_set_reg_sync(serial->port[i],
2422 CLK_START_VALUE_REGISTER, Data);
2423 if (status < 0) {
2424 dbg("Writing CLK_START_VALUE_REGISTER failed status-0x%x", status);
2425 break;
2426 } else
2427 dbg("CLK_START_VALUE_REGISTER Writing success status%d", status);
2428
2429 Data = 0x20;
2430 status = mos7840_set_reg_sync(serial->port[i],
2431 CLK_MULTI_REGISTER, Data);
2432 if (status < 0) {
2433 dbg("Writing CLK_MULTI_REGISTER failed status-0x%x",
2434 status);
2435 goto error;
2436 } else
2437 dbg("CLK_MULTI_REGISTER Writing success status%d",
2438 status);
2439
2440 /* write value 0x0 to scratchpad register */
2441 Data = 0x00;
2442 status = mos7840_set_uart_reg(serial->port[i],
2443 SCRATCH_PAD_REGISTER, Data);
2444 if (status < 0) {
2445 dbg("Writing SCRATCH_PAD_REGISTER failed status-0x%x",
2446 status);
2447 break;
2448 } else
2449 dbg("SCRATCH_PAD_REGISTER Writing success status%d",
2450 status);
2451
2452 /* Zero Length flag register */
2453 if ((mos7840_port->port_num != 1)
2454 && (serial->num_ports == 2)) {
2455
2456 Data = 0xff;
2457 status = mos7840_set_reg_sync(serial->port[i],
2458 (__u16) (ZLP_REG1 +
2459 ((__u16)mos7840_port->port_num)), Data);
2460 dbg("ZLIP offset %x",
2461 (__u16) (ZLP_REG1 +
2462 ((__u16) mos7840_port->port_num)));
2463 if (status < 0) {
2464 dbg("Writing ZLP_REG%d failed status-0x%x",
2465 i + 2, status);
2466 break;
2467 } else
2468 dbg("ZLP_REG%d Writing success status%d",
2469 i + 2, status);
2470 } else {
2471 Data = 0xff;
2472 status = mos7840_set_reg_sync(serial->port[i],
2473 (__u16) (ZLP_REG1 +
2474 ((__u16)mos7840_port->port_num) - 0x1), Data);
2475 dbg("ZLIP offset %x",
2476 (__u16) (ZLP_REG1 +
2477 ((__u16) mos7840_port->port_num) - 0x1));
2478 if (status < 0) {
2479 dbg("Writing ZLP_REG%d failed status-0x%x",
2480 i + 1, status);
2481 break;
2482 } else
2483 dbg("ZLP_REG%d Writing success status%d",
2484 i + 1, status);
2485
2486 }
2487 mos7840_port->control_urb = usb_alloc_urb(0, GFP_KERNEL);
2488 mos7840_port->ctrl_buf = kmalloc(16, GFP_KERNEL);
2489 mos7840_port->dr = kmalloc(sizeof(struct usb_ctrlrequest),
2490 GFP_KERNEL);
2491 if (!mos7840_port->control_urb || !mos7840_port->ctrl_buf ||
2492 !mos7840_port->dr) {
2493 status = -ENOMEM;
2494 goto error;
2495 }
2496 }
2497 dbg ("mos7840_startup: all ports configured...........");
2498
2499 /* Zero Length flag enable */
2500 Data = 0x0f;
2501 status = mos7840_set_reg_sync(serial->port[0], ZLP_REG5, Data);
2502 if (status < 0) {
2503 dbg("Writing ZLP_REG5 failed status-0x%x", status);
2504 goto error;
2505 } else
2506 dbg("ZLP_REG5 Writing success status%d", status);
2507
2508 /* setting configuration feature to one */
2509 usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0),
2510 (__u8) 0x03, 0x00, 0x01, 0x00, NULL, 0x00, 5 * HZ);
2511 return 0;
2512 error:
2513 for (/* nothing */; i >= 0; i--) {
2514 mos7840_port = mos7840_get_port_private(serial->port[i]);
2515
2516 kfree(mos7840_port->dr);
2517 kfree(mos7840_port->ctrl_buf);
2518 usb_free_urb(mos7840_port->control_urb);
2519 kfree(mos7840_port);
2520 serial->port[i] = NULL;
2521 }
2522 return status;
2523 }
2524
2525 /****************************************************************************
2526 * mos7840_disconnect
2527 * This function is called whenever the device is removed from the usb bus.
2528 ****************************************************************************/
2529
2530 static void mos7840_disconnect(struct usb_serial *serial)
2531 {
2532 int i;
2533 unsigned long flags;
2534 struct moschip_port *mos7840_port;
2535 dbg("%s", " disconnect :entering..........");
2536
2537 if (!serial) {
2538 dbg("%s", "Invalid Handler");
2539 return;
2540 }
2541
2542 /* check for the ports to be closed,close the ports and disconnect */
2543
2544 /* free private structure allocated for serial port *
2545 * stop reads and writes on all ports */
2546
2547 for (i = 0; i < serial->num_ports; ++i) {
2548 mos7840_port = mos7840_get_port_private(serial->port[i]);
2549 dbg ("mos7840_port %d = %p", i, mos7840_port);
2550 if (mos7840_port) {
2551 spin_lock_irqsave(&mos7840_port->pool_lock, flags);
2552 mos7840_port->zombie = 1;
2553 spin_unlock_irqrestore(&mos7840_port->pool_lock, flags);
2554 usb_kill_urb(mos7840_port->control_urb);
2555 }
2556 }
2557
2558 dbg("%s", "Thank u :: ");
2559
2560 }
2561
2562 /****************************************************************************
2563 * mos7840_release
2564 * This function is called when the usb_serial structure is freed.
2565 ****************************************************************************/
2566
2567 static void mos7840_release(struct usb_serial *serial)
2568 {
2569 int i;
2570 struct moschip_port *mos7840_port;
2571 dbg("%s", " release :entering..........");
2572
2573 if (!serial) {
2574 dbg("%s", "Invalid Handler");
2575 return;
2576 }
2577
2578 /* check for the ports to be closed,close the ports and disconnect */
2579
2580 /* free private structure allocated for serial port *
2581 * stop reads and writes on all ports */
2582
2583 for (i = 0; i < serial->num_ports; ++i) {
2584 mos7840_port = mos7840_get_port_private(serial->port[i]);
2585 dbg("mos7840_port %d = %p", i, mos7840_port);
2586 if (mos7840_port) {
2587 kfree(mos7840_port->ctrl_buf);
2588 kfree(mos7840_port->dr);
2589 kfree(mos7840_port);
2590 }
2591 }
2592
2593 dbg("%s", "Thank u :: ");
2594
2595 }
2596
2597 static struct usb_driver io_driver = {
2598 .name = "mos7840",
2599 .probe = usb_serial_probe,
2600 .disconnect = usb_serial_disconnect,
2601 .id_table = moschip_id_table_combined,
2602 .no_dynamic_id = 1,
2603 };
2604
2605 static struct usb_serial_driver moschip7840_4port_device = {
2606 .driver = {
2607 .owner = THIS_MODULE,
2608 .name = "mos7840",
2609 },
2610 .description = DRIVER_DESC,
2611 .usb_driver = &io_driver,
2612 .id_table = moschip_port_id_table,
2613 .num_ports = 4,
2614 .open = mos7840_open,
2615 .close = mos7840_close,
2616 .write = mos7840_write,
2617 .write_room = mos7840_write_room,
2618 .chars_in_buffer = mos7840_chars_in_buffer,
2619 .throttle = mos7840_throttle,
2620 .unthrottle = mos7840_unthrottle,
2621 .calc_num_ports = mos7840_calc_num_ports,
2622 #ifdef MCSSerialProbe
2623 .probe = mos7840_serial_probe,
2624 #endif
2625 .ioctl = mos7840_ioctl,
2626 .set_termios = mos7840_set_termios,
2627 .break_ctl = mos7840_break,
2628 .tiocmget = mos7840_tiocmget,
2629 .tiocmset = mos7840_tiocmset,
2630 .attach = mos7840_startup,
2631 .disconnect = mos7840_disconnect,
2632 .release = mos7840_release,
2633 .read_bulk_callback = mos7840_bulk_in_callback,
2634 .read_int_callback = mos7840_interrupt_callback,
2635 };
2636
2637 /****************************************************************************
2638 * moschip7840_init
2639 * This is called by the module subsystem, or on startup to initialize us
2640 ****************************************************************************/
2641 static int __init moschip7840_init(void)
2642 {
2643 int retval;
2644
2645 dbg("%s", " mos7840_init :entering..........");
2646
2647 /* Register with the usb serial */
2648 retval = usb_serial_register(&moschip7840_4port_device);
2649
2650 if (retval)
2651 goto failed_port_device_register;
2652
2653 dbg("%s", "Entering...");
2654 printk(KERN_INFO KBUILD_MODNAME ": " DRIVER_VERSION ":"
2655 DRIVER_DESC "\n");
2656
2657 /* Register with the usb */
2658 retval = usb_register(&io_driver);
2659 if (retval == 0) {
2660 dbg("%s", "Leaving...");
2661 return 0;
2662 }
2663 usb_serial_deregister(&moschip7840_4port_device);
2664 failed_port_device_register:
2665 return retval;
2666 }
2667
2668 /****************************************************************************
2669 * moschip7840_exit
2670 * Called when the driver is about to be unloaded.
2671 ****************************************************************************/
2672 static void __exit moschip7840_exit(void)
2673 {
2674
2675 dbg("%s", " mos7840_exit :entering..........");
2676
2677 usb_deregister(&io_driver);
2678
2679 usb_serial_deregister(&moschip7840_4port_device);
2680
2681 dbg("%s", "Entering...");
2682 }
2683
2684 module_init(moschip7840_init);
2685 module_exit(moschip7840_exit);
2686
2687 /* Module information */
2688 MODULE_DESCRIPTION(DRIVER_DESC);
2689 MODULE_LICENSE("GPL");
2690
2691 module_param(debug, bool, S_IRUGO | S_IWUSR);
2692 MODULE_PARM_DESC(debug, "Debug enabled or not");
Linux for Ginger Game Console