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Staging: strip: delete the driver
[linux/fpc-iii.git] / drivers / usb / serial / mos7840.c
blob2fda1c0182b74848259f563a3ccfa38731c209f9
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_USO9ML2_2 0xAC22
125 #define BANDB_DEVICE_ID_USO9ML2_4 0xAC24
126 #define BANDB_DEVICE_ID_US9ML2_2 0xAC29
127 #define BANDB_DEVICE_ID_US9ML2_4 0xAC30
128 #define BANDB_DEVICE_ID_USPTL4_2 0xAC31
129 #define BANDB_DEVICE_ID_USPTL4_4 0xAC32
130 #define BANDB_DEVICE_ID_USOPTL4_2 0xAC42
131 #define BANDB_DEVICE_ID_USOPTL4_4 0xAC44
132 #define BANDB_DEVICE_ID_USOPTL2_4 0xAC24
133
134 /* This driver also supports
135 * ATEN UC2324 device using Moschip MCS7840
136 * ATEN UC2322 device using Moschip MCS7820
137 */
138 #define USB_VENDOR_ID_ATENINTL 0x0557
139 #define ATENINTL_DEVICE_ID_UC2324 0x2011
140 #define ATENINTL_DEVICE_ID_UC2322 0x7820
141
142 /* Interrupt Routine Defines */
143
144 #define SERIAL_IIR_RLS 0x06
145 #define SERIAL_IIR_MS 0x00
146
147 /*
148 * Emulation of the bit mask on the LINE STATUS REGISTER.
149 */
150 #define SERIAL_LSR_DR 0x0001
151 #define SERIAL_LSR_OE 0x0002
152 #define SERIAL_LSR_PE 0x0004
153 #define SERIAL_LSR_FE 0x0008
154 #define SERIAL_LSR_BI 0x0010
155
156 #define MOS_MSR_DELTA_CTS 0x10
157 #define MOS_MSR_DELTA_DSR 0x20
158 #define MOS_MSR_DELTA_RI 0x40
159 #define MOS_MSR_DELTA_CD 0x80
160
161 /* Serial Port register Address */
162 #define INTERRUPT_ENABLE_REGISTER ((__u16)(0x01))
163 #define FIFO_CONTROL_REGISTER ((__u16)(0x02))
164 #define LINE_CONTROL_REGISTER ((__u16)(0x03))
165 #define MODEM_CONTROL_REGISTER ((__u16)(0x04))
166 #define LINE_STATUS_REGISTER ((__u16)(0x05))
167 #define MODEM_STATUS_REGISTER ((__u16)(0x06))
168 #define SCRATCH_PAD_REGISTER ((__u16)(0x07))
169 #define DIVISOR_LATCH_LSB ((__u16)(0x00))
170 #define DIVISOR_LATCH_MSB ((__u16)(0x01))
171
172 #define CLK_MULTI_REGISTER ((__u16)(0x02))
173 #define CLK_START_VALUE_REGISTER ((__u16)(0x03))
174
175 #define SERIAL_LCR_DLAB ((__u16)(0x0080))
176
177 /*
178 * URB POOL related defines
179 */
180 #define NUM_URBS 16 /* URB Count */
181 #define URB_TRANSFER_BUFFER_SIZE 32 /* URB Size */
182
183
184 static const struct usb_device_id moschip_port_id_table[] = {
185 {USB_DEVICE(USB_VENDOR_ID_MOSCHIP, MOSCHIP_DEVICE_ID_7840)},
186 {USB_DEVICE(USB_VENDOR_ID_MOSCHIP, MOSCHIP_DEVICE_ID_7820)},
187 {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USO9ML2_2)},
188 {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USO9ML2_4)},
189 {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_US9ML2_2)},
190 {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_US9ML2_4)},
191 {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USPTL4_2)},
192 {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USPTL4_4)},
193 {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USOPTL4_2)},
194 {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USOPTL4_4)},
195 {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USOPTL2_4)},
196 {USB_DEVICE(USB_VENDOR_ID_ATENINTL, ATENINTL_DEVICE_ID_UC2324)},
197 {USB_DEVICE(USB_VENDOR_ID_ATENINTL, ATENINTL_DEVICE_ID_UC2322)},
198 {} /* terminating entry */
199 };
200
201 static const struct usb_device_id moschip_id_table_combined[] __devinitconst = {
202 {USB_DEVICE(USB_VENDOR_ID_MOSCHIP, MOSCHIP_DEVICE_ID_7840)},
203 {USB_DEVICE(USB_VENDOR_ID_MOSCHIP, MOSCHIP_DEVICE_ID_7820)},
204 {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USO9ML2_2)},
205 {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USO9ML2_4)},
206 {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_US9ML2_2)},
207 {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_US9ML2_4)},
208 {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USPTL4_2)},
209 {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USPTL4_4)},
210 {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USOPTL4_2)},
211 {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USOPTL4_4)},
212 {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USOPTL2_4)},
213 {USB_DEVICE(USB_VENDOR_ID_ATENINTL, ATENINTL_DEVICE_ID_UC2324)},
214 {USB_DEVICE(USB_VENDOR_ID_ATENINTL, ATENINTL_DEVICE_ID_UC2322)},
215 {} /* terminating entry */
216 };
217
218 MODULE_DEVICE_TABLE(usb, moschip_id_table_combined);
219
220 /* This structure holds all of the local port information */
221
222 struct moschip_port {
223 int port_num; /*Actual port number in the device(1,2,etc) */
224 struct urb *write_urb; /* write URB for this port */
225 struct urb *read_urb; /* read URB for this port */
226 struct urb *int_urb;
227 __u8 shadowLCR; /* last LCR value received */
228 __u8 shadowMCR; /* last MCR value received */
229 char open;
230 char open_ports;
231 char zombie;
232 wait_queue_head_t wait_chase; /* for handling sleeping while waiting for chase to finish */
233 wait_queue_head_t delta_msr_wait; /* for handling sleeping while waiting for msr change to happen */
234 int delta_msr_cond;
235 struct async_icount icount;
236 struct usb_serial_port *port; /* loop back to the owner of this object */
237
238 /* Offsets */
239 __u8 SpRegOffset;
240 __u8 ControlRegOffset;
241 __u8 DcrRegOffset;
242 /* for processing control URBS in interrupt context */
243 struct urb *control_urb;
244 struct usb_ctrlrequest *dr;
245 char *ctrl_buf;
246 int MsrLsr;
247
248 spinlock_t pool_lock;
249 struct urb *write_urb_pool[NUM_URBS];
250 char busy[NUM_URBS];
251 bool read_urb_busy;
252 };
253
254
255 static int debug;
256
257 /*
258 * mos7840_set_reg_sync
259 * To set the Control register by calling usb_fill_control_urb function
260 * by passing usb_sndctrlpipe function as parameter.
261 */
262
263 static int mos7840_set_reg_sync(struct usb_serial_port *port, __u16 reg,
264 __u16 val)
265 {
266 struct usb_device *dev = port->serial->dev;
267 val = val & 0x00ff;
268 dbg("mos7840_set_reg_sync offset is %x, value %x", reg, val);
269
270 return usb_control_msg(dev, usb_sndctrlpipe(dev, 0), MCS_WRREQ,
271 MCS_WR_RTYPE, val, reg, NULL, 0,
272 MOS_WDR_TIMEOUT);
273 }
274
275 /*
276 * mos7840_get_reg_sync
277 * To set the Uart register by calling usb_fill_control_urb function by
278 * passing usb_rcvctrlpipe function as parameter.
279 */
280
281 static int mos7840_get_reg_sync(struct usb_serial_port *port, __u16 reg,
282 __u16 *val)
283 {
284 struct usb_device *dev = port->serial->dev;
285 int ret = 0;
286 u8 *buf;
287
288 buf = kmalloc(VENDOR_READ_LENGTH, GFP_KERNEL);
289 if (!buf)
290 return -ENOMEM;
291
292 ret = usb_control_msg(dev, usb_rcvctrlpipe(dev, 0), MCS_RDREQ,
293 MCS_RD_RTYPE, 0, reg, buf, VENDOR_READ_LENGTH,
294 MOS_WDR_TIMEOUT);
295 *val = buf[0];
296 dbg("mos7840_get_reg_sync offset is %x, return val %x", reg, *val);
297
298 kfree(buf);
299 return ret;
300 }
301
302 /*
303 * mos7840_set_uart_reg
304 * To set the Uart register by calling usb_fill_control_urb function by
305 * passing usb_sndctrlpipe function as parameter.
306 */
307
308 static int mos7840_set_uart_reg(struct usb_serial_port *port, __u16 reg,
309 __u16 val)
310 {
311
312 struct usb_device *dev = port->serial->dev;
313 val = val & 0x00ff;
314 /* For the UART control registers, the application number need
315 to be Or'ed */
316 if (port->serial->num_ports == 4) {
317 val |= (((__u16) port->number -
318 (__u16) (port->serial->minor)) + 1) << 8;
319 dbg("mos7840_set_uart_reg application number is %x", val);
320 } else {
321 if (((__u16) port->number - (__u16) (port->serial->minor)) == 0) {
322 val |= (((__u16) port->number -
323 (__u16) (port->serial->minor)) + 1) << 8;
324 dbg("mos7840_set_uart_reg application number is %x",
325 val);
326 } else {
327 val |=
328 (((__u16) port->number -
329 (__u16) (port->serial->minor)) + 2) << 8;
330 dbg("mos7840_set_uart_reg application number is %x",
331 val);
332 }
333 }
334 return usb_control_msg(dev, usb_sndctrlpipe(dev, 0), MCS_WRREQ,
335 MCS_WR_RTYPE, val, reg, NULL, 0,
336 MOS_WDR_TIMEOUT);
337
338 }
339
340 /*
341 * mos7840_get_uart_reg
342 * To set the Control register by calling usb_fill_control_urb function
343 * by passing usb_rcvctrlpipe function as parameter.
344 */
345 static int mos7840_get_uart_reg(struct usb_serial_port *port, __u16 reg,
346 __u16 *val)
347 {
348 struct usb_device *dev = port->serial->dev;
349 int ret = 0;
350 __u16 Wval;
351 u8 *buf;
352
353 buf = kmalloc(VENDOR_READ_LENGTH, GFP_KERNEL);
354 if (!buf)
355 return -ENOMEM;
356
357 /* dbg("application number is %4x",
358 (((__u16)port->number - (__u16)(port->serial->minor))+1)<<8); */
359 /* Wval is same as application number */
360 if (port->serial->num_ports == 4) {
361 Wval =
362 (((__u16) port->number - (__u16) (port->serial->minor)) +
363 1) << 8;
364 dbg("mos7840_get_uart_reg application number is %x", Wval);
365 } else {
366 if (((__u16) port->number - (__u16) (port->serial->minor)) == 0) {
367 Wval = (((__u16) port->number -
368 (__u16) (port->serial->minor)) + 1) << 8;
369 dbg("mos7840_get_uart_reg application number is %x",
370 Wval);
371 } else {
372 Wval = (((__u16) port->number -
373 (__u16) (port->serial->minor)) + 2) << 8;
374 dbg("mos7840_get_uart_reg application number is %x",
375 Wval);
376 }
377 }
378 ret = usb_control_msg(dev, usb_rcvctrlpipe(dev, 0), MCS_RDREQ,
379 MCS_RD_RTYPE, Wval, reg, buf, VENDOR_READ_LENGTH,
380 MOS_WDR_TIMEOUT);
381 *val = buf[0];
382
383 kfree(buf);
384 return ret;
385 }
386
387 static void mos7840_dump_serial_port(struct moschip_port *mos7840_port)
388 {
389
390 dbg("***************************************");
391 dbg("SpRegOffset is %2x", mos7840_port->SpRegOffset);
392 dbg("ControlRegOffset is %2x", mos7840_port->ControlRegOffset);
393 dbg("DCRRegOffset is %2x", mos7840_port->DcrRegOffset);
394 dbg("***************************************");
395
396 }
397
398 /************************************************************************/
399 /************************************************************************/
400 /* I N T E R F A C E F U N C T I O N S */
401 /* I N T E R F A C E F U N C T I O N S */
402 /************************************************************************/
403 /************************************************************************/
404
405 static inline void mos7840_set_port_private(struct usb_serial_port *port,
406 struct moschip_port *data)
407 {
408 usb_set_serial_port_data(port, (void *)data);
409 }
410
411 static inline struct moschip_port *mos7840_get_port_private(struct
412 usb_serial_port
413 *port)
414 {
415 return (struct moschip_port *)usb_get_serial_port_data(port);
416 }
417
418 static void mos7840_handle_new_msr(struct moschip_port *port, __u8 new_msr)
419 {
420 struct moschip_port *mos7840_port;
421 struct async_icount *icount;
422 mos7840_port = port;
423 icount = &mos7840_port->icount;
424 if (new_msr &
425 (MOS_MSR_DELTA_CTS | MOS_MSR_DELTA_DSR | MOS_MSR_DELTA_RI |
426 MOS_MSR_DELTA_CD)) {
427 icount = &mos7840_port->icount;
428
429 /* update input line counters */
430 if (new_msr & MOS_MSR_DELTA_CTS) {
431 icount->cts++;
432 smp_wmb();
433 }
434 if (new_msr & MOS_MSR_DELTA_DSR) {
435 icount->dsr++;
436 smp_wmb();
437 }
438 if (new_msr & MOS_MSR_DELTA_CD) {
439 icount->dcd++;
440 smp_wmb();
441 }
442 if (new_msr & MOS_MSR_DELTA_RI) {
443 icount->rng++;
444 smp_wmb();
445 }
446 }
447 }
448
449 static void mos7840_handle_new_lsr(struct moschip_port *port, __u8 new_lsr)
450 {
451 struct async_icount *icount;
452
453 dbg("%s - %02x", __func__, new_lsr);
454
455 if (new_lsr & SERIAL_LSR_BI) {
456 /*
457 * Parity and Framing errors only count if they
458 * occur exclusive of a break being
459 * received.
460 */
461 new_lsr &= (__u8) (SERIAL_LSR_OE | SERIAL_LSR_BI);
462 }
463
464 /* update input line counters */
465 icount = &port->icount;
466 if (new_lsr & SERIAL_LSR_BI) {
467 icount->brk++;
468 smp_wmb();
469 }
470 if (new_lsr & SERIAL_LSR_OE) {
471 icount->overrun++;
472 smp_wmb();
473 }
474 if (new_lsr & SERIAL_LSR_PE) {
475 icount->parity++;
476 smp_wmb();
477 }
478 if (new_lsr & SERIAL_LSR_FE) {
479 icount->frame++;
480 smp_wmb();
481 }
482 }
483
484 /************************************************************************/
485 /************************************************************************/
486 /* U S B C A L L B A C K F U N C T I O N S */
487 /* U S B C A L L B A C K F U N C T I O N S */
488 /************************************************************************/
489 /************************************************************************/
490
491 static void mos7840_control_callback(struct urb *urb)
492 {
493 unsigned char *data;
494 struct moschip_port *mos7840_port;
495 __u8 regval = 0x0;
496 int result = 0;
497 int status = urb->status;
498
499 mos7840_port = urb->context;
500
501 switch (status) {
502 case 0:
503 /* success */
504 break;
505 case -ECONNRESET:
506 case -ENOENT:
507 case -ESHUTDOWN:
508 /* this urb is terminated, clean up */
509 dbg("%s - urb shutting down with status: %d", __func__,
510 status);
511 return;
512 default:
513 dbg("%s - nonzero urb status received: %d", __func__,
514 status);
515 goto exit;
516 }
517
518 dbg("%s urb buffer size is %d", __func__, urb->actual_length);
519 dbg("%s mos7840_port->MsrLsr is %d port %d", __func__,
520 mos7840_port->MsrLsr, mos7840_port->port_num);
521 data = urb->transfer_buffer;
522 regval = (__u8) data[0];
523 dbg("%s data is %x", __func__, regval);
524 if (mos7840_port->MsrLsr == 0)
525 mos7840_handle_new_msr(mos7840_port, regval);
526 else if (mos7840_port->MsrLsr == 1)
527 mos7840_handle_new_lsr(mos7840_port, regval);
528
529 exit:
530 spin_lock(&mos7840_port->pool_lock);
531 if (!mos7840_port->zombie)
532 result = usb_submit_urb(mos7840_port->int_urb, GFP_ATOMIC);
533 spin_unlock(&mos7840_port->pool_lock);
534 if (result) {
535 dev_err(&urb->dev->dev,
536 "%s - Error %d submitting interrupt urb\n",
537 __func__, result);
538 }
539 }
540
541 static int mos7840_get_reg(struct moschip_port *mcs, __u16 Wval, __u16 reg,
542 __u16 *val)
543 {
544 struct usb_device *dev = mcs->port->serial->dev;
545 struct usb_ctrlrequest *dr = mcs->dr;
546 unsigned char *buffer = mcs->ctrl_buf;
547 int ret;
548
549 dr->bRequestType = MCS_RD_RTYPE;
550 dr->bRequest = MCS_RDREQ;
551 dr->wValue = cpu_to_le16(Wval); /* 0 */
552 dr->wIndex = cpu_to_le16(reg);
553 dr->wLength = cpu_to_le16(2);
554
555 usb_fill_control_urb(mcs->control_urb, dev, usb_rcvctrlpipe(dev, 0),
556 (unsigned char *)dr, buffer, 2,
557 mos7840_control_callback, mcs);
558 mcs->control_urb->transfer_buffer_length = 2;
559 ret = usb_submit_urb(mcs->control_urb, GFP_ATOMIC);
560 return ret;
561 }
562
563 /*****************************************************************************
564 * mos7840_interrupt_callback
565 * this is the callback function for when we have received data on the
566 * interrupt endpoint.
567 *****************************************************************************/
568
569 static void mos7840_interrupt_callback(struct urb *urb)
570 {
571 int result;
572 int length;
573 struct moschip_port *mos7840_port;
574 struct usb_serial *serial;
575 __u16 Data;
576 unsigned char *data;
577 __u8 sp[5], st;
578 int i, rv = 0;
579 __u16 wval, wreg = 0;
580 int status = urb->status;
581
582 dbg("%s", " : Entering");
583
584 switch (status) {
585 case 0:
586 /* success */
587 break;
588 case -ECONNRESET:
589 case -ENOENT:
590 case -ESHUTDOWN:
591 /* this urb is terminated, clean up */
592 dbg("%s - urb shutting down with status: %d", __func__,
593 status);
594 return;
595 default:
596 dbg("%s - nonzero urb status received: %d", __func__,
597 status);
598 goto exit;
599 }
600
601 length = urb->actual_length;
602 data = urb->transfer_buffer;
603
604 serial = urb->context;
605
606 /* Moschip get 5 bytes
607 * Byte 1 IIR Port 1 (port.number is 0)
608 * Byte 2 IIR Port 2 (port.number is 1)
609 * Byte 3 IIR Port 3 (port.number is 2)
610 * Byte 4 IIR Port 4 (port.number is 3)
611 * Byte 5 FIFO status for both */
612
613 if (length && length > 5) {
614 dbg("%s", "Wrong data !!!");
615 return;
616 }
617
618 sp[0] = (__u8) data[0];
619 sp[1] = (__u8) data[1];
620 sp[2] = (__u8) data[2];
621 sp[3] = (__u8) data[3];
622 st = (__u8) data[4];
623
624 for (i = 0; i < serial->num_ports; i++) {
625 mos7840_port = mos7840_get_port_private(serial->port[i]);
626 wval =
627 (((__u16) serial->port[i]->number -
628 (__u16) (serial->minor)) + 1) << 8;
629 if (mos7840_port->open) {
630 if (sp[i] & 0x01) {
631 dbg("SP%d No Interrupt !!!", i);
632 } else {
633 switch (sp[i] & 0x0f) {
634 case SERIAL_IIR_RLS:
635 dbg("Serial Port %d: Receiver status error or ", i);
636 dbg("address bit detected in 9-bit mode");
637 mos7840_port->MsrLsr = 1;
638 wreg = LINE_STATUS_REGISTER;
639 break;
640 case SERIAL_IIR_MS:
641 dbg("Serial Port %d: Modem status change", i);
642 mos7840_port->MsrLsr = 0;
643 wreg = MODEM_STATUS_REGISTER;
644 break;
645 }
646 spin_lock(&mos7840_port->pool_lock);
647 if (!mos7840_port->zombie) {
648 rv = mos7840_get_reg(mos7840_port, wval, wreg, &Data);
649 } else {
650 spin_unlock(&mos7840_port->pool_lock);
651 return;
652 }
653 spin_unlock(&mos7840_port->pool_lock);
654 }
655 }
656 }
657 if (!(rv < 0))
658 /* the completion handler for the control urb will resubmit */
659 return;
660 exit:
661 result = usb_submit_urb(urb, GFP_ATOMIC);
662 if (result) {
663 dev_err(&urb->dev->dev,
664 "%s - Error %d submitting interrupt urb\n",
665 __func__, result);
666 }
667 }
668
669 static int mos7840_port_paranoia_check(struct usb_serial_port *port,
670 const char *function)
671 {
672 if (!port) {
673 dbg("%s - port == NULL", function);
674 return -1;
675 }
676 if (!port->serial) {
677 dbg("%s - port->serial == NULL", function);
678 return -1;
679 }
680
681 return 0;
682 }
683
684 /* Inline functions to check the sanity of a pointer that is passed to us */
685 static int mos7840_serial_paranoia_check(struct usb_serial *serial,
686 const char *function)
687 {
688 if (!serial) {
689 dbg("%s - serial == NULL", function);
690 return -1;
691 }
692 if (!serial->type) {
693 dbg("%s - serial->type == NULL!", function);
694 return -1;
695 }
696
697 return 0;
698 }
699
700 static struct usb_serial *mos7840_get_usb_serial(struct usb_serial_port *port,
701 const char *function)
702 {
703 /* if no port was specified, or it fails a paranoia check */
704 if (!port ||
705 mos7840_port_paranoia_check(port, function) ||
706 mos7840_serial_paranoia_check(port->serial, function)) {
707 /* then say that we don't have a valid usb_serial thing,
708 * which will end up genrating -ENODEV return values */
709 return NULL;
710 }
711
712 return port->serial;
713 }
714
715 /*****************************************************************************
716 * mos7840_bulk_in_callback
717 * this is the callback function for when we have received data on the
718 * bulk in endpoint.
719 *****************************************************************************/
720
721 static void mos7840_bulk_in_callback(struct urb *urb)
722 {
723 int retval;
724 unsigned char *data;
725 struct usb_serial *serial;
726 struct usb_serial_port *port;
727 struct moschip_port *mos7840_port;
728 struct tty_struct *tty;
729 int status = urb->status;
730
731 mos7840_port = urb->context;
732 if (!mos7840_port) {
733 dbg("%s", "NULL mos7840_port pointer");
734 mos7840_port->read_urb_busy = false;
735 return;
736 }
737
738 if (status) {
739 dbg("nonzero read bulk status received: %d", status);
740 mos7840_port->read_urb_busy = false;
741 return;
742 }
743
744 port = (struct usb_serial_port *)mos7840_port->port;
745 if (mos7840_port_paranoia_check(port, __func__)) {
746 dbg("%s", "Port Paranoia failed");
747 mos7840_port->read_urb_busy = false;
748 return;
749 }
750
751 serial = mos7840_get_usb_serial(port, __func__);
752 if (!serial) {
753 dbg("%s", "Bad serial pointer");
754 mos7840_port->read_urb_busy = false;
755 return;
756 }
757
758 dbg("%s", "Entering... ");
759
760 data = urb->transfer_buffer;
761
762 dbg("%s", "Entering ...........");
763
764 if (urb->actual_length) {
765 tty = tty_port_tty_get(&mos7840_port->port->port);
766 if (tty) {
767 tty_insert_flip_string(tty, data, urb->actual_length);
768 dbg(" %s ", data);
769 tty_flip_buffer_push(tty);
770 tty_kref_put(tty);
771 }
772 mos7840_port->icount.rx += urb->actual_length;
773 smp_wmb();
774 dbg("mos7840_port->icount.rx is %d:",
775 mos7840_port->icount.rx);
776 }
777
778 if (!mos7840_port->read_urb) {
779 dbg("%s", "URB KILLED !!!");
780 mos7840_port->read_urb_busy = false;
781 return;
782 }
783
784
785 mos7840_port->read_urb->dev = serial->dev;
786
787 mos7840_port->read_urb_busy = true;
788 retval = usb_submit_urb(mos7840_port->read_urb, GFP_ATOMIC);
789
790 if (retval) {
791 dbg("usb_submit_urb(read bulk) failed, retval = %d", retval);
792 mos7840_port->read_urb_busy = false;
793 }
794 }
795
796 /*****************************************************************************
797 * mos7840_bulk_out_data_callback
798 * this is the callback function for when we have finished sending
799 * serial data on the bulk out endpoint.
800 *****************************************************************************/
801
802 static void mos7840_bulk_out_data_callback(struct urb *urb)
803 {
804 struct moschip_port *mos7840_port;
805 struct tty_struct *tty;
806 int status = urb->status;
807 int i;
808
809 mos7840_port = urb->context;
810 spin_lock(&mos7840_port->pool_lock);
811 for (i = 0; i < NUM_URBS; i++) {
812 if (urb == mos7840_port->write_urb_pool[i]) {
813 mos7840_port->busy[i] = 0;
814 break;
815 }
816 }
817 spin_unlock(&mos7840_port->pool_lock);
818
819 if (status) {
820 dbg("nonzero write bulk status received:%d", status);
821 return;
822 }
823
824 if (mos7840_port_paranoia_check(mos7840_port->port, __func__)) {
825 dbg("%s", "Port Paranoia failed");
826 return;
827 }
828
829 dbg("%s", "Entering .........");
830
831 tty = tty_port_tty_get(&mos7840_port->port->port);
832 if (tty && mos7840_port->open)
833 tty_wakeup(tty);
834 tty_kref_put(tty);
835
836 }
837
838 /************************************************************************/
839 /* 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 */
840 /************************************************************************/
841 #ifdef MCSSerialProbe
842 static int mos7840_serial_probe(struct usb_serial *serial,
843 const struct usb_device_id *id)
844 {
845
846 /*need to implement the mode_reg reading and updating\
847 structures usb_serial_ device_type\
848 (i.e num_ports, num_bulkin,bulkout etc) */
849 /* Also we can update the changes attach */
850 return 1;
851 }
852 #endif
853
854 /*****************************************************************************
855 * mos7840_open
856 * this function is called by the tty driver when a port is opened
857 * If successful, we return 0
858 * Otherwise we return a negative error number.
859 *****************************************************************************/
860
861 static int mos7840_open(struct tty_struct *tty, struct usb_serial_port *port)
862 {
863 int response;
864 int j;
865 struct usb_serial *serial;
866 struct urb *urb;
867 __u16 Data;
868 int status;
869 struct moschip_port *mos7840_port;
870 struct moschip_port *port0;
871
872 dbg ("%s enter", __func__);
873
874 if (mos7840_port_paranoia_check(port, __func__)) {
875 dbg("%s", "Port Paranoia failed");
876 return -ENODEV;
877 }
878
879 serial = port->serial;
880
881 if (mos7840_serial_paranoia_check(serial, __func__)) {
882 dbg("%s", "Serial Paranoia failed");
883 return -ENODEV;
884 }
885
886 mos7840_port = mos7840_get_port_private(port);
887 port0 = mos7840_get_port_private(serial->port[0]);
888
889 if (mos7840_port == NULL || port0 == NULL)
890 return -ENODEV;
891
892 usb_clear_halt(serial->dev, port->write_urb->pipe);
893 usb_clear_halt(serial->dev, port->read_urb->pipe);
894 port0->open_ports++;
895
896 /* Initialising the write urb pool */
897 for (j = 0; j < NUM_URBS; ++j) {
898 urb = usb_alloc_urb(0, GFP_KERNEL);
899 mos7840_port->write_urb_pool[j] = urb;
900
901 if (urb == NULL) {
902 dev_err(&port->dev, "No more urbs???\n");
903 continue;
904 }
905
906 urb->transfer_buffer = kmalloc(URB_TRANSFER_BUFFER_SIZE,
907 GFP_KERNEL);
908 if (!urb->transfer_buffer) {
909 usb_free_urb(urb);
910 mos7840_port->write_urb_pool[j] = NULL;
911 dev_err(&port->dev,
912 "%s-out of memory for urb buffers.\n",
913 __func__);
914 continue;
915 }
916 }
917
918 /*****************************************************************************
919 * Initialize MCS7840 -- Write Init values to corresponding Registers
920 *
921 * Register Index
922 * 1 : IER
923 * 2 : FCR
924 * 3 : LCR
925 * 4 : MCR
926 *
927 * 0x08 : SP1/2 Control Reg
928 *****************************************************************************/
929
930 /* NEED to check the following Block */
931
932 Data = 0x0;
933 status = mos7840_get_reg_sync(port, mos7840_port->SpRegOffset, &Data);
934 if (status < 0) {
935 dbg("Reading Spreg failed");
936 return -1;
937 }
938 Data |= 0x80;
939 status = mos7840_set_reg_sync(port, mos7840_port->SpRegOffset, Data);
940 if (status < 0) {
941 dbg("writing Spreg failed");
942 return -1;
943 }
944
945 Data &= ~0x80;
946 status = mos7840_set_reg_sync(port, mos7840_port->SpRegOffset, Data);
947 if (status < 0) {
948 dbg("writing Spreg failed");
949 return -1;
950 }
951 /* End of block to be checked */
952
953 Data = 0x0;
954 status = mos7840_get_reg_sync(port, mos7840_port->ControlRegOffset,
955 &Data);
956 if (status < 0) {
957 dbg("Reading Controlreg failed");
958 return -1;
959 }
960 Data |= 0x08; /* Driver done bit */
961 Data |= 0x20; /* rx_disable */
962 status = mos7840_set_reg_sync(port,
963 mos7840_port->ControlRegOffset, Data);
964 if (status < 0) {
965 dbg("writing Controlreg failed");
966 return -1;
967 }
968 /* do register settings here */
969 /* Set all regs to the device default values. */
970 /***********************************
971 * First Disable all interrupts.
972 ***********************************/
973 Data = 0x00;
974 status = mos7840_set_uart_reg(port, INTERRUPT_ENABLE_REGISTER, Data);
975 if (status < 0) {
976 dbg("disabling interrupts failed");
977 return -1;
978 }
979 /* Set FIFO_CONTROL_REGISTER to the default value */
980 Data = 0x00;
981 status = mos7840_set_uart_reg(port, FIFO_CONTROL_REGISTER, Data);
982 if (status < 0) {
983 dbg("Writing FIFO_CONTROL_REGISTER failed");
984 return -1;
985 }
986
987 Data = 0xcf;
988 status = mos7840_set_uart_reg(port, FIFO_CONTROL_REGISTER, Data);
989 if (status < 0) {
990 dbg("Writing FIFO_CONTROL_REGISTER failed");
991 return -1;
992 }
993
994 Data = 0x03;
995 status = mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data);
996 mos7840_port->shadowLCR = Data;
997
998 Data = 0x0b;
999 status = mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER, Data);
1000 mos7840_port->shadowMCR = Data;
1001
1002 Data = 0x00;
1003 status = mos7840_get_uart_reg(port, LINE_CONTROL_REGISTER, &Data);
1004 mos7840_port->shadowLCR = Data;
1005
1006 Data |= SERIAL_LCR_DLAB; /* data latch enable in LCR 0x80 */
1007 status = mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data);
1008
1009 Data = 0x0c;
1010 status = mos7840_set_uart_reg(port, DIVISOR_LATCH_LSB, Data);
1011
1012 Data = 0x0;
1013 status = mos7840_set_uart_reg(port, DIVISOR_LATCH_MSB, Data);
1014
1015 Data = 0x00;
1016 status = mos7840_get_uart_reg(port, LINE_CONTROL_REGISTER, &Data);
1017
1018 Data = Data & ~SERIAL_LCR_DLAB;
1019 status = mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data);
1020 mos7840_port->shadowLCR = Data;
1021
1022 /* clearing Bulkin and Bulkout Fifo */
1023 Data = 0x0;
1024 status = mos7840_get_reg_sync(port, mos7840_port->SpRegOffset, &Data);
1025
1026 Data = Data | 0x0c;
1027 status = mos7840_set_reg_sync(port, mos7840_port->SpRegOffset, Data);
1028
1029 Data = Data & ~0x0c;
1030 status = mos7840_set_reg_sync(port, mos7840_port->SpRegOffset, Data);
1031 /* Finally enable all interrupts */
1032 Data = 0x0c;
1033 status = mos7840_set_uart_reg(port, INTERRUPT_ENABLE_REGISTER, Data);
1034
1035 /* clearing rx_disable */
1036 Data = 0x0;
1037 status = mos7840_get_reg_sync(port, mos7840_port->ControlRegOffset,
1038 &Data);
1039 Data = Data & ~0x20;
1040 status = mos7840_set_reg_sync(port, mos7840_port->ControlRegOffset,
1041 Data);
1042
1043 /* rx_negate */
1044 Data = 0x0;
1045 status = mos7840_get_reg_sync(port, mos7840_port->ControlRegOffset,
1046 &Data);
1047 Data = Data | 0x10;
1048 status = mos7840_set_reg_sync(port, mos7840_port->ControlRegOffset,
1049 Data);
1050
1051 /* Check to see if we've set up our endpoint info yet *
1052 * (can't set it up in mos7840_startup as the structures *
1053 * were not set up at that time.) */
1054 if (port0->open_ports == 1) {
1055 if (serial->port[0]->interrupt_in_buffer == NULL) {
1056 /* set up interrupt urb */
1057 usb_fill_int_urb(serial->port[0]->interrupt_in_urb,
1058 serial->dev,
1059 usb_rcvintpipe(serial->dev,
1060 serial->port[0]->interrupt_in_endpointAddress),
1061 serial->port[0]->interrupt_in_buffer,
1062 serial->port[0]->interrupt_in_urb->
1063 transfer_buffer_length,
1064 mos7840_interrupt_callback,
1065 serial,
1066 serial->port[0]->interrupt_in_urb->interval);
1067
1068 /* start interrupt read for mos7840 *
1069 * will continue as long as mos7840 is connected */
1070
1071 response =
1072 usb_submit_urb(serial->port[0]->interrupt_in_urb,
1073 GFP_KERNEL);
1074 if (response) {
1075 dev_err(&port->dev, "%s - Error %d submitting "
1076 "interrupt urb\n", __func__, response);
1077 }
1078
1079 }
1080
1081 }
1082
1083 /* see if we've set up our endpoint info yet *
1084 * (can't set it up in mos7840_startup as the *
1085 * structures were not set up at that time.) */
1086
1087 dbg("port number is %d", port->number);
1088 dbg("serial number is %d", port->serial->minor);
1089 dbg("Bulkin endpoint is %d", port->bulk_in_endpointAddress);
1090 dbg("BulkOut endpoint is %d", port->bulk_out_endpointAddress);
1091 dbg("Interrupt endpoint is %d", port->interrupt_in_endpointAddress);
1092 dbg("port's number in the device is %d", mos7840_port->port_num);
1093 mos7840_port->read_urb = port->read_urb;
1094
1095 /* set up our bulk in urb */
1096
1097 usb_fill_bulk_urb(mos7840_port->read_urb,
1098 serial->dev,
1099 usb_rcvbulkpipe(serial->dev,
1100 port->bulk_in_endpointAddress),
1101 port->bulk_in_buffer,
1102 mos7840_port->read_urb->transfer_buffer_length,
1103 mos7840_bulk_in_callback, mos7840_port);
1104
1105 dbg("mos7840_open: bulkin endpoint is %d",
1106 port->bulk_in_endpointAddress);
1107 mos7840_port->read_urb_busy = true;
1108 response = usb_submit_urb(mos7840_port->read_urb, GFP_KERNEL);
1109 if (response) {
1110 dev_err(&port->dev, "%s - Error %d submitting control urb\n",
1111 __func__, response);
1112 mos7840_port->read_urb_busy = false;
1113 }
1114
1115 /* initialize our wait queues */
1116 init_waitqueue_head(&mos7840_port->wait_chase);
1117 init_waitqueue_head(&mos7840_port->delta_msr_wait);
1118
1119 /* initialize our icount structure */
1120 memset(&(mos7840_port->icount), 0x00, sizeof(mos7840_port->icount));
1121
1122 /* initialize our port settings */
1123 /* Must set to enable ints! */
1124 mos7840_port->shadowMCR = MCR_MASTER_IE;
1125 /* send a open port command */
1126 mos7840_port->open = 1;
1127 /* mos7840_change_port_settings(mos7840_port,old_termios); */
1128 mos7840_port->icount.tx = 0;
1129 mos7840_port->icount.rx = 0;
1130
1131 dbg("usb_serial serial:%p mos7840_port:%p\n usb_serial_port port:%p",
1132 serial, mos7840_port, port);
1133
1134 dbg ("%s leave", __func__);
1135
1136 return 0;
1137
1138 }
1139
1140 /*****************************************************************************
1141 * mos7840_chars_in_buffer
1142 * this function is called by the tty driver when it wants to know how many
1143 * bytes of data we currently have outstanding in the port (data that has
1144 * been written, but hasn't made it out the port yet)
1145 * If successful, we return the number of bytes left to be written in the
1146 * system,
1147 * Otherwise we return zero.
1148 *****************************************************************************/
1149
1150 static int mos7840_chars_in_buffer(struct tty_struct *tty)
1151 {
1152 struct usb_serial_port *port = tty->driver_data;
1153 int i;
1154 int chars = 0;
1155 unsigned long flags;
1156 struct moschip_port *mos7840_port;
1157
1158 dbg("%s", " mos7840_chars_in_buffer:entering ...........");
1159
1160 if (mos7840_port_paranoia_check(port, __func__)) {
1161 dbg("%s", "Invalid port");
1162 return 0;
1163 }
1164
1165 mos7840_port = mos7840_get_port_private(port);
1166 if (mos7840_port == NULL) {
1167 dbg("%s", "mos7840_break:leaving ...........");
1168 return 0;
1169 }
1170
1171 spin_lock_irqsave(&mos7840_port->pool_lock, flags);
1172 for (i = 0; i < NUM_URBS; ++i)
1173 if (mos7840_port->busy[i])
1174 chars += URB_TRANSFER_BUFFER_SIZE;
1175 spin_unlock_irqrestore(&mos7840_port->pool_lock, flags);
1176 dbg("%s - returns %d", __func__, chars);
1177 return chars;
1178
1179 }
1180
1181 /*****************************************************************************
1182 * mos7840_close
1183 * this function is called by the tty driver when a port is closed
1184 *****************************************************************************/
1185
1186 static void mos7840_close(struct usb_serial_port *port)
1187 {
1188 struct usb_serial *serial;
1189 struct moschip_port *mos7840_port;
1190 struct moschip_port *port0;
1191 int j;
1192 __u16 Data;
1193
1194 dbg("%s", "mos7840_close:entering...");
1195
1196 if (mos7840_port_paranoia_check(port, __func__)) {
1197 dbg("%s", "Port Paranoia failed");
1198 return;
1199 }
1200
1201 serial = mos7840_get_usb_serial(port, __func__);
1202 if (!serial) {
1203 dbg("%s", "Serial Paranoia failed");
1204 return;
1205 }
1206
1207 mos7840_port = mos7840_get_port_private(port);
1208 port0 = mos7840_get_port_private(serial->port[0]);
1209
1210 if (mos7840_port == NULL || port0 == NULL)
1211 return;
1212
1213 for (j = 0; j < NUM_URBS; ++j)
1214 usb_kill_urb(mos7840_port->write_urb_pool[j]);
1215
1216 /* Freeing Write URBs */
1217 for (j = 0; j < NUM_URBS; ++j) {
1218 if (mos7840_port->write_urb_pool[j]) {
1219 if (mos7840_port->write_urb_pool[j]->transfer_buffer)
1220 kfree(mos7840_port->write_urb_pool[j]->
1221 transfer_buffer);
1222
1223 usb_free_urb(mos7840_port->write_urb_pool[j]);
1224 }
1225 }
1226
1227 /* While closing port, shutdown all bulk read, write *
1228 * and interrupt read if they exists */
1229 if (serial->dev) {
1230 if (mos7840_port->write_urb) {
1231 dbg("%s", "Shutdown bulk write");
1232 usb_kill_urb(mos7840_port->write_urb);
1233 }
1234 if (mos7840_port->read_urb) {
1235 dbg("%s", "Shutdown bulk read");
1236 usb_kill_urb(mos7840_port->read_urb);
1237 mos7840_port->read_urb_busy = false;
1238 }
1239 if ((&mos7840_port->control_urb)) {
1240 dbg("%s", "Shutdown control read");
1241 /*/ usb_kill_urb (mos7840_port->control_urb); */
1242 }
1243 }
1244 /* if(mos7840_port->ctrl_buf != NULL) */
1245 /* kfree(mos7840_port->ctrl_buf); */
1246 port0->open_ports--;
1247 dbg("mos7840_num_open_ports in close%d:in port%d",
1248 port0->open_ports, port->number);
1249 if (port0->open_ports == 0) {
1250 if (serial->port[0]->interrupt_in_urb) {
1251 dbg("%s", "Shutdown interrupt_in_urb");
1252 usb_kill_urb(serial->port[0]->interrupt_in_urb);
1253 }
1254 }
1255
1256 if (mos7840_port->write_urb) {
1257 /* if this urb had a transfer buffer already (old tx) free it */
1258 if (mos7840_port->write_urb->transfer_buffer != NULL)
1259 kfree(mos7840_port->write_urb->transfer_buffer);
1260 usb_free_urb(mos7840_port->write_urb);
1261 }
1262
1263 Data = 0x0;
1264 mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER, Data);
1265
1266 Data = 0x00;
1267 mos7840_set_uart_reg(port, INTERRUPT_ENABLE_REGISTER, Data);
1268
1269 mos7840_port->open = 0;
1270
1271 dbg("%s", "Leaving ............");
1272 }
1273
1274 /************************************************************************
1275 *
1276 * mos7840_block_until_chase_response
1277 *
1278 * This function will block the close until one of the following:
1279 * 1. Response to our Chase comes from mos7840
1280 * 2. A timeout of 10 seconds without activity has expired
1281 * (1K of mos7840 data @ 2400 baud ==> 4 sec to empty)
1282 *
1283 ************************************************************************/
1284
1285 static void mos7840_block_until_chase_response(struct tty_struct *tty,
1286 struct moschip_port *mos7840_port)
1287 {
1288 int timeout = 1 * HZ;
1289 int wait = 10;
1290 int count;
1291
1292 while (1) {
1293 count = mos7840_chars_in_buffer(tty);
1294
1295 /* Check for Buffer status */
1296 if (count <= 0)
1297 return;
1298
1299 /* Block the thread for a while */
1300 interruptible_sleep_on_timeout(&mos7840_port->wait_chase,
1301 timeout);
1302 /* No activity.. count down section */
1303 wait--;
1304 if (wait == 0) {
1305 dbg("%s - TIMEOUT", __func__);
1306 return;
1307 } else {
1308 /* Reset timeout value back to seconds */
1309 wait = 10;
1310 }
1311 }
1312
1313 }
1314
1315 /*****************************************************************************
1316 * mos7840_break
1317 * this function sends a break to the port
1318 *****************************************************************************/
1319 static void mos7840_break(struct tty_struct *tty, int break_state)
1320 {
1321 struct usb_serial_port *port = tty->driver_data;
1322 unsigned char data;
1323 struct usb_serial *serial;
1324 struct moschip_port *mos7840_port;
1325
1326 dbg("%s", "Entering ...........");
1327 dbg("mos7840_break: Start");
1328
1329 if (mos7840_port_paranoia_check(port, __func__)) {
1330 dbg("%s", "Port Paranoia failed");
1331 return;
1332 }
1333
1334 serial = mos7840_get_usb_serial(port, __func__);
1335 if (!serial) {
1336 dbg("%s", "Serial Paranoia failed");
1337 return;
1338 }
1339
1340 mos7840_port = mos7840_get_port_private(port);
1341
1342 if (mos7840_port == NULL)
1343 return;
1344
1345 if (serial->dev)
1346 /* flush and block until tx is empty */
1347 mos7840_block_until_chase_response(tty, mos7840_port);
1348
1349 if (break_state == -1)
1350 data = mos7840_port->shadowLCR | LCR_SET_BREAK;
1351 else
1352 data = mos7840_port->shadowLCR & ~LCR_SET_BREAK;
1353
1354 /* FIXME: no locking on shadowLCR anywhere in driver */
1355 mos7840_port->shadowLCR = data;
1356 dbg("mcs7840_break mos7840_port->shadowLCR is %x",
1357 mos7840_port->shadowLCR);
1358 mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER,
1359 mos7840_port->shadowLCR);
1360
1361 return;
1362 }
1363
1364 /*****************************************************************************
1365 * mos7840_write_room
1366 * this function is called by the tty driver when it wants to know how many
1367 * bytes of data we can accept for a specific port.
1368 * If successful, we return the amount of room that we have for this port
1369 * Otherwise we return a negative error number.
1370 *****************************************************************************/
1371
1372 static int mos7840_write_room(struct tty_struct *tty)
1373 {
1374 struct usb_serial_port *port = tty->driver_data;
1375 int i;
1376 int room = 0;
1377 unsigned long flags;
1378 struct moschip_port *mos7840_port;
1379
1380 dbg("%s", " mos7840_write_room:entering ...........");
1381
1382 if (mos7840_port_paranoia_check(port, __func__)) {
1383 dbg("%s", "Invalid port");
1384 dbg("%s", " mos7840_write_room:leaving ...........");
1385 return -1;
1386 }
1387
1388 mos7840_port = mos7840_get_port_private(port);
1389 if (mos7840_port == NULL) {
1390 dbg("%s", "mos7840_break:leaving ...........");
1391 return -1;
1392 }
1393
1394 spin_lock_irqsave(&mos7840_port->pool_lock, flags);
1395 for (i = 0; i < NUM_URBS; ++i) {
1396 if (!mos7840_port->busy[i])
1397 room += URB_TRANSFER_BUFFER_SIZE;
1398 }
1399 spin_unlock_irqrestore(&mos7840_port->pool_lock, flags);
1400
1401 room = (room == 0) ? 0 : room - URB_TRANSFER_BUFFER_SIZE + 1;
1402 dbg("%s - returns %d", __func__, room);
1403 return room;
1404
1405 }
1406
1407 /*****************************************************************************
1408 * mos7840_write
1409 * this function is called by the tty driver when data should be written to
1410 * the port.
1411 * If successful, we return the number of bytes written, otherwise we
1412 * return a negative error number.
1413 *****************************************************************************/
1414
1415 static int mos7840_write(struct tty_struct *tty, struct usb_serial_port *port,
1416 const unsigned char *data, int count)
1417 {
1418 int status;
1419 int i;
1420 int bytes_sent = 0;
1421 int transfer_size;
1422 unsigned long flags;
1423
1424 struct moschip_port *mos7840_port;
1425 struct usb_serial *serial;
1426 struct urb *urb;
1427 /* __u16 Data; */
1428 const unsigned char *current_position = data;
1429 unsigned char *data1;
1430 dbg("%s", "entering ...........");
1431 /* dbg("mos7840_write: mos7840_port->shadowLCR is %x",
1432 mos7840_port->shadowLCR); */
1433
1434 #ifdef NOTMOS7840
1435 Data = 0x00;
1436 status = mos7840_get_uart_reg(port, LINE_CONTROL_REGISTER, &Data);
1437 mos7840_port->shadowLCR = Data;
1438 dbg("mos7840_write: LINE_CONTROL_REGISTER is %x", Data);
1439 dbg("mos7840_write: mos7840_port->shadowLCR is %x",
1440 mos7840_port->shadowLCR);
1441
1442 /* Data = 0x03; */
1443 /* status = mos7840_set_uart_reg(port,LINE_CONTROL_REGISTER,Data); */
1444 /* mos7840_port->shadowLCR=Data;//Need to add later */
1445
1446 Data |= SERIAL_LCR_DLAB; /* data latch enable in LCR 0x80 */
1447 status = mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data);
1448
1449 /* Data = 0x0c; */
1450 /* status = mos7840_set_uart_reg(port,DIVISOR_LATCH_LSB,Data); */
1451 Data = 0x00;
1452 status = mos7840_get_uart_reg(port, DIVISOR_LATCH_LSB, &Data);
1453 dbg("mos7840_write:DLL value is %x", Data);
1454
1455 Data = 0x0;
1456 status = mos7840_get_uart_reg(port, DIVISOR_LATCH_MSB, &Data);
1457 dbg("mos7840_write:DLM value is %x", Data);
1458
1459 Data = Data & ~SERIAL_LCR_DLAB;
1460 dbg("mos7840_write: mos7840_port->shadowLCR is %x",
1461 mos7840_port->shadowLCR);
1462 status = mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data);
1463 #endif
1464
1465 if (mos7840_port_paranoia_check(port, __func__)) {
1466 dbg("%s", "Port Paranoia failed");
1467 return -1;
1468 }
1469
1470 serial = port->serial;
1471 if (mos7840_serial_paranoia_check(serial, __func__)) {
1472 dbg("%s", "Serial Paranoia failed");
1473 return -1;
1474 }
1475
1476 mos7840_port = mos7840_get_port_private(port);
1477 if (mos7840_port == NULL) {
1478 dbg("%s", "mos7840_port is NULL");
1479 return -1;
1480 }
1481
1482 /* try to find a free urb in the list */
1483 urb = NULL;
1484
1485 spin_lock_irqsave(&mos7840_port->pool_lock, flags);
1486 for (i = 0; i < NUM_URBS; ++i) {
1487 if (!mos7840_port->busy[i]) {
1488 mos7840_port->busy[i] = 1;
1489 urb = mos7840_port->write_urb_pool[i];
1490 dbg("URB:%d", i);
1491 break;
1492 }
1493 }
1494 spin_unlock_irqrestore(&mos7840_port->pool_lock, flags);
1495
1496 if (urb == NULL) {
1497 dbg("%s - no more free urbs", __func__);
1498 goto exit;
1499 }
1500
1501 if (urb->transfer_buffer == NULL) {
1502 urb->transfer_buffer =
1503 kmalloc(URB_TRANSFER_BUFFER_SIZE, GFP_KERNEL);
1504
1505 if (urb->transfer_buffer == NULL) {
1506 dev_err(&port->dev, "%s no more kernel memory...\n",
1507 __func__);
1508 goto exit;
1509 }
1510 }
1511 transfer_size = min(count, URB_TRANSFER_BUFFER_SIZE);
1512
1513 memcpy(urb->transfer_buffer, current_position, transfer_size);
1514
1515 /* fill urb with data and submit */
1516 usb_fill_bulk_urb(urb,
1517 serial->dev,
1518 usb_sndbulkpipe(serial->dev,
1519 port->bulk_out_endpointAddress),
1520 urb->transfer_buffer,
1521 transfer_size,
1522 mos7840_bulk_out_data_callback, mos7840_port);
1523
1524 data1 = urb->transfer_buffer;
1525 dbg("bulkout endpoint is %d", port->bulk_out_endpointAddress);
1526
1527 /* send it down the pipe */
1528 status = usb_submit_urb(urb, GFP_ATOMIC);
1529
1530 if (status) {
1531 mos7840_port->busy[i] = 0;
1532 dev_err(&port->dev, "%s - usb_submit_urb(write bulk) failed "
1533 "with status = %d\n", __func__, status);
1534 bytes_sent = status;
1535 goto exit;
1536 }
1537 bytes_sent = transfer_size;
1538 mos7840_port->icount.tx += transfer_size;
1539 smp_wmb();
1540 dbg("mos7840_port->icount.tx is %d:", mos7840_port->icount.tx);
1541 exit:
1542 return bytes_sent;
1543
1544 }
1545
1546 /*****************************************************************************
1547 * mos7840_throttle
1548 * this function is called by the tty driver when it wants to stop the data
1549 * being read from the port.
1550 *****************************************************************************/
1551
1552 static void mos7840_throttle(struct tty_struct *tty)
1553 {
1554 struct usb_serial_port *port = tty->driver_data;
1555 struct moschip_port *mos7840_port;
1556 int status;
1557
1558 if (mos7840_port_paranoia_check(port, __func__)) {
1559 dbg("%s", "Invalid port");
1560 return;
1561 }
1562
1563 dbg("- port %d", port->number);
1564
1565 mos7840_port = mos7840_get_port_private(port);
1566
1567 if (mos7840_port == NULL)
1568 return;
1569
1570 if (!mos7840_port->open) {
1571 dbg("%s", "port not opened");
1572 return;
1573 }
1574
1575 dbg("%s", "Entering ..........");
1576
1577 /* if we are implementing XON/XOFF, send the stop character */
1578 if (I_IXOFF(tty)) {
1579 unsigned char stop_char = STOP_CHAR(tty);
1580 status = mos7840_write(tty, port, &stop_char, 1);
1581 if (status <= 0)
1582 return;
1583 }
1584 /* if we are implementing RTS/CTS, toggle that line */
1585 if (tty->termios->c_cflag & CRTSCTS) {
1586 mos7840_port->shadowMCR &= ~MCR_RTS;
1587 status = mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER,
1588 mos7840_port->shadowMCR);
1589 if (status < 0)
1590 return;
1591 }
1592
1593 return;
1594 }
1595
1596 /*****************************************************************************
1597 * mos7840_unthrottle
1598 * this function is called by the tty driver when it wants to resume
1599 * the data being read from the port (called after mos7840_throttle is
1600 * called)
1601 *****************************************************************************/
1602 static void mos7840_unthrottle(struct tty_struct *tty)
1603 {
1604 struct usb_serial_port *port = tty->driver_data;
1605 int status;
1606 struct moschip_port *mos7840_port = mos7840_get_port_private(port);
1607
1608 if (mos7840_port_paranoia_check(port, __func__)) {
1609 dbg("%s", "Invalid port");
1610 return;
1611 }
1612
1613 if (mos7840_port == NULL)
1614 return;
1615
1616 if (!mos7840_port->open) {
1617 dbg("%s - port not opened", __func__);
1618 return;
1619 }
1620
1621 dbg("%s", "Entering ..........");
1622
1623 /* if we are implementing XON/XOFF, send the start character */
1624 if (I_IXOFF(tty)) {
1625 unsigned char start_char = START_CHAR(tty);
1626 status = mos7840_write(tty, port, &start_char, 1);
1627 if (status <= 0)
1628 return;
1629 }
1630
1631 /* if we are implementing RTS/CTS, toggle that line */
1632 if (tty->termios->c_cflag & CRTSCTS) {
1633 mos7840_port->shadowMCR |= MCR_RTS;
1634 status = mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER,
1635 mos7840_port->shadowMCR);
1636 if (status < 0)
1637 return;
1638 }
1639 }
1640
1641 static int mos7840_tiocmget(struct tty_struct *tty, struct file *file)
1642 {
1643 struct usb_serial_port *port = tty->driver_data;
1644 struct moschip_port *mos7840_port;
1645 unsigned int result;
1646 __u16 msr;
1647 __u16 mcr;
1648 int status;
1649 mos7840_port = mos7840_get_port_private(port);
1650
1651 dbg("%s - port %d", __func__, port->number);
1652
1653 if (mos7840_port == NULL)
1654 return -ENODEV;
1655
1656 status = mos7840_get_uart_reg(port, MODEM_STATUS_REGISTER, &msr);
1657 status = mos7840_get_uart_reg(port, MODEM_CONTROL_REGISTER, &mcr);
1658 result = ((mcr & MCR_DTR) ? TIOCM_DTR : 0)
1659 | ((mcr & MCR_RTS) ? TIOCM_RTS : 0)
1660 | ((mcr & MCR_LOOPBACK) ? TIOCM_LOOP : 0)
1661 | ((msr & MOS7840_MSR_CTS) ? TIOCM_CTS : 0)
1662 | ((msr & MOS7840_MSR_CD) ? TIOCM_CAR : 0)
1663 | ((msr & MOS7840_MSR_RI) ? TIOCM_RI : 0)
1664 | ((msr & MOS7840_MSR_DSR) ? TIOCM_DSR : 0);
1665
1666 dbg("%s - 0x%04X", __func__, result);
1667
1668 return result;
1669 }
1670
1671 static int mos7840_tiocmset(struct tty_struct *tty, struct file *file,
1672 unsigned int set, unsigned int clear)
1673 {
1674 struct usb_serial_port *port = tty->driver_data;
1675 struct moschip_port *mos7840_port;
1676 unsigned int mcr;
1677 int status;
1678
1679 dbg("%s - port %d", __func__, port->number);
1680
1681 mos7840_port = mos7840_get_port_private(port);
1682
1683 if (mos7840_port == NULL)
1684 return -ENODEV;
1685
1686 /* FIXME: What locks the port registers ? */
1687 mcr = mos7840_port->shadowMCR;
1688 if (clear & TIOCM_RTS)
1689 mcr &= ~MCR_RTS;
1690 if (clear & TIOCM_DTR)
1691 mcr &= ~MCR_DTR;
1692 if (clear & TIOCM_LOOP)
1693 mcr &= ~MCR_LOOPBACK;
1694
1695 if (set & TIOCM_RTS)
1696 mcr |= MCR_RTS;
1697 if (set & TIOCM_DTR)
1698 mcr |= MCR_DTR;
1699 if (set & TIOCM_LOOP)
1700 mcr |= MCR_LOOPBACK;
1701
1702 mos7840_port->shadowMCR = mcr;
1703
1704 status = mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER, mcr);
1705 if (status < 0) {
1706 dbg("setting MODEM_CONTROL_REGISTER Failed");
1707 return status;
1708 }
1709
1710 return 0;
1711 }
1712
1713 /*****************************************************************************
1714 * mos7840_calc_baud_rate_divisor
1715 * this function calculates the proper baud rate divisor for the specified
1716 * baud rate.
1717 *****************************************************************************/
1718 static int mos7840_calc_baud_rate_divisor(int baudRate, int *divisor,
1719 __u16 *clk_sel_val)
1720 {
1721
1722 dbg("%s - %d", __func__, baudRate);
1723
1724 if (baudRate <= 115200) {
1725 *divisor = 115200 / baudRate;
1726 *clk_sel_val = 0x0;
1727 }
1728 if ((baudRate > 115200) && (baudRate <= 230400)) {
1729 *divisor = 230400 / baudRate;
1730 *clk_sel_val = 0x10;
1731 } else if ((baudRate > 230400) && (baudRate <= 403200)) {
1732 *divisor = 403200 / baudRate;
1733 *clk_sel_val = 0x20;
1734 } else if ((baudRate > 403200) && (baudRate <= 460800)) {
1735 *divisor = 460800 / baudRate;
1736 *clk_sel_val = 0x30;
1737 } else if ((baudRate > 460800) && (baudRate <= 806400)) {
1738 *divisor = 806400 / baudRate;
1739 *clk_sel_val = 0x40;
1740 } else if ((baudRate > 806400) && (baudRate <= 921600)) {
1741 *divisor = 921600 / baudRate;
1742 *clk_sel_val = 0x50;
1743 } else if ((baudRate > 921600) && (baudRate <= 1572864)) {
1744 *divisor = 1572864 / baudRate;
1745 *clk_sel_val = 0x60;
1746 } else if ((baudRate > 1572864) && (baudRate <= 3145728)) {
1747 *divisor = 3145728 / baudRate;
1748 *clk_sel_val = 0x70;
1749 }
1750 return 0;
1751
1752 #ifdef NOTMCS7840
1753
1754 for (i = 0; i < ARRAY_SIZE(mos7840_divisor_table); i++) {
1755 if (mos7840_divisor_table[i].BaudRate == baudrate) {
1756 *divisor = mos7840_divisor_table[i].Divisor;
1757 return 0;
1758 }
1759 }
1760
1761 /* After trying for all the standard baud rates *
1762 * Try calculating the divisor for this baud rate */
1763
1764 if (baudrate > 75 && baudrate < 230400) {
1765 /* get the divisor */
1766 custom = (__u16) (230400L / baudrate);
1767
1768 /* Check for round off */
1769 round1 = (__u16) (2304000L / baudrate);
1770 round = (__u16) (round1 - (custom * 10));
1771 if (round > 4)
1772 custom++;
1773 *divisor = custom;
1774
1775 dbg(" Baud %d = %d", baudrate, custom);
1776 return 0;
1777 }
1778
1779 dbg("%s", " Baud calculation Failed...");
1780 return -1;
1781 #endif
1782 }
1783
1784 /*****************************************************************************
1785 * mos7840_send_cmd_write_baud_rate
1786 * this function sends the proper command to change the baud rate of the
1787 * specified port.
1788 *****************************************************************************/
1789
1790 static int mos7840_send_cmd_write_baud_rate(struct moschip_port *mos7840_port,
1791 int baudRate)
1792 {
1793 int divisor = 0;
1794 int status;
1795 __u16 Data;
1796 unsigned char number;
1797 __u16 clk_sel_val;
1798 struct usb_serial_port *port;
1799
1800 if (mos7840_port == NULL)
1801 return -1;
1802
1803 port = (struct usb_serial_port *)mos7840_port->port;
1804 if (mos7840_port_paranoia_check(port, __func__)) {
1805 dbg("%s", "Invalid port");
1806 return -1;
1807 }
1808
1809 if (mos7840_serial_paranoia_check(port->serial, __func__)) {
1810 dbg("%s", "Invalid Serial");
1811 return -1;
1812 }
1813
1814 dbg("%s", "Entering ..........");
1815
1816 number = mos7840_port->port->number - mos7840_port->port->serial->minor;
1817
1818 dbg("%s - port = %d, baud = %d", __func__,
1819 mos7840_port->port->number, baudRate);
1820 /* reset clk_uart_sel in spregOffset */
1821 if (baudRate > 115200) {
1822 #ifdef HW_flow_control
1823 /* NOTE: need to see the pther register to modify */
1824 /* setting h/w flow control bit to 1 */
1825 Data = 0x2b;
1826 mos7840_port->shadowMCR = Data;
1827 status = mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER,
1828 Data);
1829 if (status < 0) {
1830 dbg("Writing spreg failed in set_serial_baud");
1831 return -1;
1832 }
1833 #endif
1834
1835 } else {
1836 #ifdef HW_flow_control
1837 / *setting h/w flow control bit to 0 */
1838 Data = 0xb;
1839 mos7840_port->shadowMCR = Data;
1840 status = mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER,
1841 Data);
1842 if (status < 0) {
1843 dbg("Writing spreg failed in set_serial_baud");
1844 return -1;
1845 }
1846 #endif
1847
1848 }
1849
1850 if (1) { /* baudRate <= 115200) */
1851 clk_sel_val = 0x0;
1852 Data = 0x0;
1853 status = mos7840_calc_baud_rate_divisor(baudRate, &divisor,
1854 &clk_sel_val);
1855 status = mos7840_get_reg_sync(port, mos7840_port->SpRegOffset,
1856 &Data);
1857 if (status < 0) {
1858 dbg("reading spreg failed in set_serial_baud");
1859 return -1;
1860 }
1861 Data = (Data & 0x8f) | clk_sel_val;
1862 status = mos7840_set_reg_sync(port, mos7840_port->SpRegOffset,
1863 Data);
1864 if (status < 0) {
1865 dbg("Writing spreg failed in set_serial_baud");
1866 return -1;
1867 }
1868 /* Calculate the Divisor */
1869
1870 if (status) {
1871 dev_err(&port->dev, "%s - bad baud rate\n", __func__);
1872 return status;
1873 }
1874 /* Enable access to divisor latch */
1875 Data = mos7840_port->shadowLCR | SERIAL_LCR_DLAB;
1876 mos7840_port->shadowLCR = Data;
1877 mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data);
1878
1879 /* Write the divisor */
1880 Data = (unsigned char)(divisor & 0xff);
1881 dbg("set_serial_baud Value to write DLL is %x", Data);
1882 mos7840_set_uart_reg(port, DIVISOR_LATCH_LSB, Data);
1883
1884 Data = (unsigned char)((divisor & 0xff00) >> 8);
1885 dbg("set_serial_baud Value to write DLM is %x", Data);
1886 mos7840_set_uart_reg(port, DIVISOR_LATCH_MSB, Data);
1887
1888 /* Disable access to divisor latch */
1889 Data = mos7840_port->shadowLCR & ~SERIAL_LCR_DLAB;
1890 mos7840_port->shadowLCR = Data;
1891 mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data);
1892
1893 }
1894 return status;
1895 }
1896
1897 /*****************************************************************************
1898 * mos7840_change_port_settings
1899 * This routine is called to set the UART on the device to match
1900 * the specified new settings.
1901 *****************************************************************************/
1902
1903 static void mos7840_change_port_settings(struct tty_struct *tty,
1904 struct moschip_port *mos7840_port, struct ktermios *old_termios)
1905 {
1906 int baud;
1907 unsigned cflag;
1908 unsigned iflag;
1909 __u8 lData;
1910 __u8 lParity;
1911 __u8 lStop;
1912 int status;
1913 __u16 Data;
1914 struct usb_serial_port *port;
1915 struct usb_serial *serial;
1916
1917 if (mos7840_port == NULL)
1918 return;
1919
1920 port = (struct usb_serial_port *)mos7840_port->port;
1921
1922 if (mos7840_port_paranoia_check(port, __func__)) {
1923 dbg("%s", "Invalid port");
1924 return;
1925 }
1926
1927 if (mos7840_serial_paranoia_check(port->serial, __func__)) {
1928 dbg("%s", "Invalid Serial");
1929 return;
1930 }
1931
1932 serial = port->serial;
1933
1934 dbg("%s - port %d", __func__, mos7840_port->port->number);
1935
1936 if (!mos7840_port->open) {
1937 dbg("%s - port not opened", __func__);
1938 return;
1939 }
1940
1941 dbg("%s", "Entering ..........");
1942
1943 lData = LCR_BITS_8;
1944 lStop = LCR_STOP_1;
1945 lParity = LCR_PAR_NONE;
1946
1947 cflag = tty->termios->c_cflag;
1948 iflag = tty->termios->c_iflag;
1949
1950 /* Change the number of bits */
1951 if (cflag & CSIZE) {
1952 switch (cflag & CSIZE) {
1953 case CS5:
1954 lData = LCR_BITS_5;
1955 break;
1956
1957 case CS6:
1958 lData = LCR_BITS_6;
1959 break;
1960
1961 case CS7:
1962 lData = LCR_BITS_7;
1963 break;
1964 default:
1965 case CS8:
1966 lData = LCR_BITS_8;
1967 break;
1968 }
1969 }
1970 /* Change the Parity bit */
1971 if (cflag & PARENB) {
1972 if (cflag & PARODD) {
1973 lParity = LCR_PAR_ODD;
1974 dbg("%s - parity = odd", __func__);
1975 } else {
1976 lParity = LCR_PAR_EVEN;
1977 dbg("%s - parity = even", __func__);
1978 }
1979
1980 } else {
1981 dbg("%s - parity = none", __func__);
1982 }
1983
1984 if (cflag & CMSPAR)
1985 lParity = lParity | 0x20;
1986
1987 /* Change the Stop bit */
1988 if (cflag & CSTOPB) {
1989 lStop = LCR_STOP_2;
1990 dbg("%s - stop bits = 2", __func__);
1991 } else {
1992 lStop = LCR_STOP_1;
1993 dbg("%s - stop bits = 1", __func__);
1994 }
1995
1996 /* Update the LCR with the correct value */
1997 mos7840_port->shadowLCR &=
1998 ~(LCR_BITS_MASK | LCR_STOP_MASK | LCR_PAR_MASK);
1999 mos7840_port->shadowLCR |= (lData | lParity | lStop);
2000
2001 dbg("mos7840_change_port_settings mos7840_port->shadowLCR is %x",
2002 mos7840_port->shadowLCR);
2003 /* Disable Interrupts */
2004 Data = 0x00;
2005 mos7840_set_uart_reg(port, INTERRUPT_ENABLE_REGISTER, Data);
2006
2007 Data = 0x00;
2008 mos7840_set_uart_reg(port, FIFO_CONTROL_REGISTER, Data);
2009
2010 Data = 0xcf;
2011 mos7840_set_uart_reg(port, FIFO_CONTROL_REGISTER, Data);
2012
2013 /* Send the updated LCR value to the mos7840 */
2014 Data = mos7840_port->shadowLCR;
2015
2016 mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data);
2017
2018 Data = 0x00b;
2019 mos7840_port->shadowMCR = Data;
2020 mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER, Data);
2021 Data = 0x00b;
2022 mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER, Data);
2023
2024 /* set up the MCR register and send it to the mos7840 */
2025
2026 mos7840_port->shadowMCR = MCR_MASTER_IE;
2027 if (cflag & CBAUD)
2028 mos7840_port->shadowMCR |= (MCR_DTR | MCR_RTS);
2029
2030 if (cflag & CRTSCTS)
2031 mos7840_port->shadowMCR |= (MCR_XON_ANY);
2032 else
2033 mos7840_port->shadowMCR &= ~(MCR_XON_ANY);
2034
2035 Data = mos7840_port->shadowMCR;
2036 mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER, Data);
2037
2038 /* Determine divisor based on baud rate */
2039 baud = tty_get_baud_rate(tty);
2040
2041 if (!baud) {
2042 /* pick a default, any default... */
2043 dbg("%s", "Picked default baud...");
2044 baud = 9600;
2045 }
2046
2047 dbg("%s - baud rate = %d", __func__, baud);
2048 status = mos7840_send_cmd_write_baud_rate(mos7840_port, baud);
2049
2050 /* Enable Interrupts */
2051 Data = 0x0c;
2052 mos7840_set_uart_reg(port, INTERRUPT_ENABLE_REGISTER, Data);
2053
2054 if (mos7840_port->read_urb_busy == false) {
2055 mos7840_port->read_urb->dev = serial->dev;
2056 mos7840_port->read_urb_busy = true;
2057 status = usb_submit_urb(mos7840_port->read_urb, GFP_ATOMIC);
2058 if (status) {
2059 dbg("usb_submit_urb(read bulk) failed, status = %d",
2060 status);
2061 mos7840_port->read_urb_busy = false;
2062 }
2063 }
2064 wake_up(&mos7840_port->delta_msr_wait);
2065 mos7840_port->delta_msr_cond = 1;
2066 dbg("mos7840_change_port_settings mos7840_port->shadowLCR is End %x",
2067 mos7840_port->shadowLCR);
2068
2069 return;
2070 }
2071
2072 /*****************************************************************************
2073 * mos7840_set_termios
2074 * this function is called by the tty driver when it wants to change
2075 * the termios structure
2076 *****************************************************************************/
2077
2078 static void mos7840_set_termios(struct tty_struct *tty,
2079 struct usb_serial_port *port,
2080 struct ktermios *old_termios)
2081 {
2082 int status;
2083 unsigned int cflag;
2084 struct usb_serial *serial;
2085 struct moschip_port *mos7840_port;
2086 dbg("mos7840_set_termios: START");
2087 if (mos7840_port_paranoia_check(port, __func__)) {
2088 dbg("%s", "Invalid port");
2089 return;
2090 }
2091
2092 serial = port->serial;
2093
2094 if (mos7840_serial_paranoia_check(serial, __func__)) {
2095 dbg("%s", "Invalid Serial");
2096 return;
2097 }
2098
2099 mos7840_port = mos7840_get_port_private(port);
2100
2101 if (mos7840_port == NULL)
2102 return;
2103
2104 if (!mos7840_port->open) {
2105 dbg("%s - port not opened", __func__);
2106 return;
2107 }
2108
2109 dbg("%s", "setting termios - ");
2110
2111 cflag = tty->termios->c_cflag;
2112
2113 dbg("%s - clfag %08x iflag %08x", __func__,
2114 tty->termios->c_cflag, RELEVANT_IFLAG(tty->termios->c_iflag));
2115 dbg("%s - old clfag %08x old iflag %08x", __func__,
2116 old_termios->c_cflag, RELEVANT_IFLAG(old_termios->c_iflag));
2117 dbg("%s - port %d", __func__, port->number);
2118
2119 /* change the port settings to the new ones specified */
2120
2121 mos7840_change_port_settings(tty, mos7840_port, old_termios);
2122
2123 if (!mos7840_port->read_urb) {
2124 dbg("%s", "URB KILLED !!!!!");
2125 return;
2126 }
2127
2128 if (mos7840_port->read_urb_busy == false) {
2129 mos7840_port->read_urb->dev = serial->dev;
2130 mos7840_port->read_urb_busy = true;
2131 status = usb_submit_urb(mos7840_port->read_urb, GFP_ATOMIC);
2132 if (status) {
2133 dbg("usb_submit_urb(read bulk) failed, status = %d",
2134 status);
2135 mos7840_port->read_urb_busy = false;
2136 }
2137 }
2138 return;
2139 }
2140
2141 /*****************************************************************************
2142 * mos7840_get_lsr_info - get line status register info
2143 *
2144 * Purpose: Let user call ioctl() to get info when the UART physically
2145 * is emptied. On bus types like RS485, the transmitter must
2146 * release the bus after transmitting. This must be done when
2147 * the transmit shift register is empty, not be done when the
2148 * transmit holding register is empty. This functionality
2149 * allows an RS485 driver to be written in user space.
2150 *****************************************************************************/
2151
2152 static int mos7840_get_lsr_info(struct tty_struct *tty,
2153 unsigned int __user *value)
2154 {
2155 int count;
2156 unsigned int result = 0;
2157
2158 count = mos7840_chars_in_buffer(tty);
2159 if (count == 0) {
2160 dbg("%s -- Empty", __func__);
2161 result = TIOCSER_TEMT;
2162 }
2163
2164 if (copy_to_user(value, &result, sizeof(int)))
2165 return -EFAULT;
2166 return 0;
2167 }
2168
2169 /*****************************************************************************
2170 * mos7840_get_serial_info
2171 * function to get information about serial port
2172 *****************************************************************************/
2173
2174 static int mos7840_get_serial_info(struct moschip_port *mos7840_port,
2175 struct serial_struct __user *retinfo)
2176 {
2177 struct serial_struct tmp;
2178
2179 if (mos7840_port == NULL)
2180 return -1;
2181
2182 if (!retinfo)
2183 return -EFAULT;
2184
2185 memset(&tmp, 0, sizeof(tmp));
2186
2187 tmp.type = PORT_16550A;
2188 tmp.line = mos7840_port->port->serial->minor;
2189 tmp.port = mos7840_port->port->number;
2190 tmp.irq = 0;
2191 tmp.flags = ASYNC_SKIP_TEST | ASYNC_AUTO_IRQ;
2192 tmp.xmit_fifo_size = NUM_URBS * URB_TRANSFER_BUFFER_SIZE;
2193 tmp.baud_base = 9600;
2194 tmp.close_delay = 5 * HZ;
2195 tmp.closing_wait = 30 * HZ;
2196
2197 if (copy_to_user(retinfo, &tmp, sizeof(*retinfo)))
2198 return -EFAULT;
2199 return 0;
2200 }
2201
2202 /*****************************************************************************
2203 * SerialIoctl
2204 * this function handles any ioctl calls to the driver
2205 *****************************************************************************/
2206
2207 static int mos7840_ioctl(struct tty_struct *tty, struct file *file,
2208 unsigned int cmd, unsigned long arg)
2209 {
2210 struct usb_serial_port *port = tty->driver_data;
2211 void __user *argp = (void __user *)arg;
2212 struct moschip_port *mos7840_port;
2213
2214 struct async_icount cnow;
2215 struct async_icount cprev;
2216 struct serial_icounter_struct icount;
2217
2218 if (mos7840_port_paranoia_check(port, __func__)) {
2219 dbg("%s", "Invalid port");
2220 return -1;
2221 }
2222
2223 mos7840_port = mos7840_get_port_private(port);
2224
2225 if (mos7840_port == NULL)
2226 return -1;
2227
2228 dbg("%s - port %d, cmd = 0x%x", __func__, port->number, cmd);
2229
2230 switch (cmd) {
2231 /* return number of bytes available */
2232
2233 case TIOCSERGETLSR:
2234 dbg("%s (%d) TIOCSERGETLSR", __func__, port->number);
2235 return mos7840_get_lsr_info(tty, argp);
2236 return 0;
2237
2238 case TIOCGSERIAL:
2239 dbg("%s (%d) TIOCGSERIAL", __func__, port->number);
2240 return mos7840_get_serial_info(mos7840_port, argp);
2241
2242 case TIOCSSERIAL:
2243 dbg("%s (%d) TIOCSSERIAL", __func__, port->number);
2244 break;
2245
2246 case TIOCMIWAIT:
2247 dbg("%s (%d) TIOCMIWAIT", __func__, port->number);
2248 cprev = mos7840_port->icount;
2249 while (1) {
2250 /* interruptible_sleep_on(&mos7840_port->delta_msr_wait); */
2251 mos7840_port->delta_msr_cond = 0;
2252 wait_event_interruptible(mos7840_port->delta_msr_wait,
2253 (mos7840_port->
2254 delta_msr_cond == 1));
2255
2256 /* see if a signal did it */
2257 if (signal_pending(current))
2258 return -ERESTARTSYS;
2259 cnow = mos7840_port->icount;
2260 smp_rmb();
2261 if (cnow.rng == cprev.rng && cnow.dsr == cprev.dsr &&
2262 cnow.dcd == cprev.dcd && cnow.cts == cprev.cts)
2263 return -EIO; /* no change => error */
2264 if (((arg & TIOCM_RNG) && (cnow.rng != cprev.rng)) ||
2265 ((arg & TIOCM_DSR) && (cnow.dsr != cprev.dsr)) ||
2266 ((arg & TIOCM_CD) && (cnow.dcd != cprev.dcd)) ||
2267 ((arg & TIOCM_CTS) && (cnow.cts != cprev.cts))) {
2268 return 0;
2269 }
2270 cprev = cnow;
2271 }
2272 /* NOTREACHED */
2273 break;
2274
2275 case TIOCGICOUNT:
2276 cnow = mos7840_port->icount;
2277 smp_rmb();
2278 icount.cts = cnow.cts;
2279 icount.dsr = cnow.dsr;
2280 icount.rng = cnow.rng;
2281 icount.dcd = cnow.dcd;
2282 icount.rx = cnow.rx;
2283 icount.tx = cnow.tx;
2284 icount.frame = cnow.frame;
2285 icount.overrun = cnow.overrun;
2286 icount.parity = cnow.parity;
2287 icount.brk = cnow.brk;
2288 icount.buf_overrun = cnow.buf_overrun;
2289
2290 dbg("%s (%d) TIOCGICOUNT RX=%d, TX=%d", __func__,
2291 port->number, icount.rx, icount.tx);
2292 if (copy_to_user(argp, &icount, sizeof(icount)))
2293 return -EFAULT;
2294 return 0;
2295 default:
2296 break;
2297 }
2298 return -ENOIOCTLCMD;
2299 }
2300
2301 static int mos7840_calc_num_ports(struct usb_serial *serial)
2302 {
2303 int mos7840_num_ports = 0;
2304
2305 dbg("numberofendpoints: cur %d, alt %d",
2306 (int)serial->interface->cur_altsetting->desc.bNumEndpoints,
2307 (int)serial->interface->altsetting->desc.bNumEndpoints);
2308 if (serial->interface->cur_altsetting->desc.bNumEndpoints == 5) {
2309 mos7840_num_ports = serial->num_ports = 2;
2310 } else if (serial->interface->cur_altsetting->desc.bNumEndpoints == 9) {
2311 serial->num_bulk_in = 4;
2312 serial->num_bulk_out = 4;
2313 mos7840_num_ports = serial->num_ports = 4;
2314 }
2315 dbg ("mos7840_num_ports = %d", mos7840_num_ports);
2316 return mos7840_num_ports;
2317 }
2318
2319 /****************************************************************************
2320 * mos7840_startup
2321 ****************************************************************************/
2322
2323 static int mos7840_startup(struct usb_serial *serial)
2324 {
2325 struct moschip_port *mos7840_port;
2326 struct usb_device *dev;
2327 int i, status;
2328
2329 __u16 Data;
2330 dbg("%s", "mos7840_startup :Entering..........");
2331
2332 if (!serial) {
2333 dbg("%s", "Invalid Handler");
2334 return -1;
2335 }
2336
2337 dev = serial->dev;
2338
2339 dbg("%s", "Entering...");
2340 dbg ("mos7840_startup: serial = %p", serial);
2341
2342 /* we set up the pointers to the endpoints in the mos7840_open *
2343 * function, as the structures aren't created yet. */
2344
2345 /* set up port private structures */
2346 for (i = 0; i < serial->num_ports; ++i) {
2347 dbg ("mos7840_startup: configuring port %d............", i);
2348 mos7840_port = kzalloc(sizeof(struct moschip_port), GFP_KERNEL);
2349 if (mos7840_port == NULL) {
2350 dev_err(&dev->dev, "%s - Out of memory\n", __func__);
2351 status = -ENOMEM;
2352 i--; /* don't follow NULL pointer cleaning up */
2353 goto error;
2354 }
2355
2356 /* Initialize all port interrupt end point to port 0 int
2357 * endpoint. Our device has only one interrupt end point
2358 * common to all port */
2359
2360 mos7840_port->port = serial->port[i];
2361 mos7840_set_port_private(serial->port[i], mos7840_port);
2362 spin_lock_init(&mos7840_port->pool_lock);
2363
2364 /* minor is not initialised until later by
2365 * usb-serial.c:get_free_serial() and cannot therefore be used
2366 * to index device instances */
2367 mos7840_port->port_num = i + 1;
2368 dbg ("serial->port[i]->number = %d", serial->port[i]->number);
2369 dbg ("serial->port[i]->serial->minor = %d", serial->port[i]->serial->minor);
2370 dbg ("mos7840_port->port_num = %d", mos7840_port->port_num);
2371 dbg ("serial->minor = %d", serial->minor);
2372
2373 if (mos7840_port->port_num == 1) {
2374 mos7840_port->SpRegOffset = 0x0;
2375 mos7840_port->ControlRegOffset = 0x1;
2376 mos7840_port->DcrRegOffset = 0x4;
2377 } else if ((mos7840_port->port_num == 2)
2378 && (serial->num_ports == 4)) {
2379 mos7840_port->SpRegOffset = 0x8;
2380 mos7840_port->ControlRegOffset = 0x9;
2381 mos7840_port->DcrRegOffset = 0x16;
2382 } else if ((mos7840_port->port_num == 2)
2383 && (serial->num_ports == 2)) {
2384 mos7840_port->SpRegOffset = 0xa;
2385 mos7840_port->ControlRegOffset = 0xb;
2386 mos7840_port->DcrRegOffset = 0x19;
2387 } else if ((mos7840_port->port_num == 3)
2388 && (serial->num_ports == 4)) {
2389 mos7840_port->SpRegOffset = 0xa;
2390 mos7840_port->ControlRegOffset = 0xb;
2391 mos7840_port->DcrRegOffset = 0x19;
2392 } else if ((mos7840_port->port_num == 4)
2393 && (serial->num_ports == 4)) {
2394 mos7840_port->SpRegOffset = 0xc;
2395 mos7840_port->ControlRegOffset = 0xd;
2396 mos7840_port->DcrRegOffset = 0x1c;
2397 }
2398 mos7840_dump_serial_port(mos7840_port);
2399 mos7840_set_port_private(serial->port[i], mos7840_port);
2400
2401 /* enable rx_disable bit in control register */
2402 status = mos7840_get_reg_sync(serial->port[i],
2403 mos7840_port->ControlRegOffset, &Data);
2404 if (status < 0) {
2405 dbg("Reading ControlReg failed status-0x%x", status);
2406 break;
2407 } else
2408 dbg("ControlReg Reading success val is %x, status%d",
2409 Data, status);
2410 Data |= 0x08; /* setting driver done bit */
2411 Data |= 0x04; /* sp1_bit to have cts change reflect in
2412 modem status reg */
2413
2414 /* Data |= 0x20; //rx_disable bit */
2415 status = mos7840_set_reg_sync(serial->port[i],
2416 mos7840_port->ControlRegOffset, Data);
2417 if (status < 0) {
2418 dbg("Writing ControlReg failed(rx_disable) status-0x%x", status);
2419 break;
2420 } else
2421 dbg("ControlReg Writing success(rx_disable) status%d",
2422 status);
2423
2424 /* Write default values in DCR (i.e 0x01 in DCR0, 0x05 in DCR2
2425 and 0x24 in DCR3 */
2426 Data = 0x01;
2427 status = mos7840_set_reg_sync(serial->port[i],
2428 (__u16) (mos7840_port->DcrRegOffset + 0), Data);
2429 if (status < 0) {
2430 dbg("Writing DCR0 failed status-0x%x", status);
2431 break;
2432 } else
2433 dbg("DCR0 Writing success status%d", status);
2434
2435 Data = 0x05;
2436 status = mos7840_set_reg_sync(serial->port[i],
2437 (__u16) (mos7840_port->DcrRegOffset + 1), Data);
2438 if (status < 0) {
2439 dbg("Writing DCR1 failed status-0x%x", status);
2440 break;
2441 } else
2442 dbg("DCR1 Writing success status%d", status);
2443
2444 Data = 0x24;
2445 status = mos7840_set_reg_sync(serial->port[i],
2446 (__u16) (mos7840_port->DcrRegOffset + 2), Data);
2447 if (status < 0) {
2448 dbg("Writing DCR2 failed status-0x%x", status);
2449 break;
2450 } else
2451 dbg("DCR2 Writing success status%d", status);
2452
2453 /* write values in clkstart0x0 and clkmulti 0x20 */
2454 Data = 0x0;
2455 status = mos7840_set_reg_sync(serial->port[i],
2456 CLK_START_VALUE_REGISTER, Data);
2457 if (status < 0) {
2458 dbg("Writing CLK_START_VALUE_REGISTER failed status-0x%x", status);
2459 break;
2460 } else
2461 dbg("CLK_START_VALUE_REGISTER Writing success status%d", status);
2462
2463 Data = 0x20;
2464 status = mos7840_set_reg_sync(serial->port[i],
2465 CLK_MULTI_REGISTER, Data);
2466 if (status < 0) {
2467 dbg("Writing CLK_MULTI_REGISTER failed status-0x%x",
2468 status);
2469 goto error;
2470 } else
2471 dbg("CLK_MULTI_REGISTER Writing success status%d",
2472 status);
2473
2474 /* write value 0x0 to scratchpad register */
2475 Data = 0x00;
2476 status = mos7840_set_uart_reg(serial->port[i],
2477 SCRATCH_PAD_REGISTER, Data);
2478 if (status < 0) {
2479 dbg("Writing SCRATCH_PAD_REGISTER failed status-0x%x",
2480 status);
2481 break;
2482 } else
2483 dbg("SCRATCH_PAD_REGISTER Writing success status%d",
2484 status);
2485
2486 /* Zero Length flag register */
2487 if ((mos7840_port->port_num != 1)
2488 && (serial->num_ports == 2)) {
2489
2490 Data = 0xff;
2491 status = mos7840_set_reg_sync(serial->port[i],
2492 (__u16) (ZLP_REG1 +
2493 ((__u16)mos7840_port->port_num)), Data);
2494 dbg("ZLIP offset %x",
2495 (__u16) (ZLP_REG1 +
2496 ((__u16) mos7840_port->port_num)));
2497 if (status < 0) {
2498 dbg("Writing ZLP_REG%d failed status-0x%x",
2499 i + 2, status);
2500 break;
2501 } else
2502 dbg("ZLP_REG%d Writing success status%d",
2503 i + 2, status);
2504 } else {
2505 Data = 0xff;
2506 status = mos7840_set_reg_sync(serial->port[i],
2507 (__u16) (ZLP_REG1 +
2508 ((__u16)mos7840_port->port_num) - 0x1), Data);
2509 dbg("ZLIP offset %x",
2510 (__u16) (ZLP_REG1 +
2511 ((__u16) mos7840_port->port_num) - 0x1));
2512 if (status < 0) {
2513 dbg("Writing ZLP_REG%d failed status-0x%x",
2514 i + 1, status);
2515 break;
2516 } else
2517 dbg("ZLP_REG%d Writing success status%d",
2518 i + 1, status);
2519
2520 }
2521 mos7840_port->control_urb = usb_alloc_urb(0, GFP_KERNEL);
2522 mos7840_port->ctrl_buf = kmalloc(16, GFP_KERNEL);
2523 mos7840_port->dr = kmalloc(sizeof(struct usb_ctrlrequest),
2524 GFP_KERNEL);
2525 if (!mos7840_port->control_urb || !mos7840_port->ctrl_buf ||
2526 !mos7840_port->dr) {
2527 status = -ENOMEM;
2528 goto error;
2529 }
2530 }
2531 dbg ("mos7840_startup: all ports configured...........");
2532
2533 /* Zero Length flag enable */
2534 Data = 0x0f;
2535 status = mos7840_set_reg_sync(serial->port[0], ZLP_REG5, Data);
2536 if (status < 0) {
2537 dbg("Writing ZLP_REG5 failed status-0x%x", status);
2538 goto error;
2539 } else
2540 dbg("ZLP_REG5 Writing success status%d", status);
2541
2542 /* setting configuration feature to one */
2543 usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0),
2544 (__u8) 0x03, 0x00, 0x01, 0x00, NULL, 0x00, 5 * HZ);
2545 return 0;
2546 error:
2547 for (/* nothing */; i >= 0; i--) {
2548 mos7840_port = mos7840_get_port_private(serial->port[i]);
2549
2550 kfree(mos7840_port->dr);
2551 kfree(mos7840_port->ctrl_buf);
2552 usb_free_urb(mos7840_port->control_urb);
2553 kfree(mos7840_port);
2554 serial->port[i] = NULL;
2555 }
2556 return status;
2557 }
2558
2559 /****************************************************************************
2560 * mos7840_disconnect
2561 * This function is called whenever the device is removed from the usb bus.
2562 ****************************************************************************/
2563
2564 static void mos7840_disconnect(struct usb_serial *serial)
2565 {
2566 int i;
2567 unsigned long flags;
2568 struct moschip_port *mos7840_port;
2569 dbg("%s", " disconnect :entering..........");
2570
2571 if (!serial) {
2572 dbg("%s", "Invalid Handler");
2573 return;
2574 }
2575
2576 /* check for the ports to be closed,close the ports and disconnect */
2577
2578 /* free private structure allocated for serial port *
2579 * stop reads and writes on all ports */
2580
2581 for (i = 0; i < serial->num_ports; ++i) {
2582 mos7840_port = mos7840_get_port_private(serial->port[i]);
2583 dbg ("mos7840_port %d = %p", i, mos7840_port);
2584 if (mos7840_port) {
2585 spin_lock_irqsave(&mos7840_port->pool_lock, flags);
2586 mos7840_port->zombie = 1;
2587 spin_unlock_irqrestore(&mos7840_port->pool_lock, flags);
2588 usb_kill_urb(mos7840_port->control_urb);
2589 }
2590 }
2591
2592 dbg("%s", "Thank u :: ");
2593
2594 }
2595
2596 /****************************************************************************
2597 * mos7840_release
2598 * This function is called when the usb_serial structure is freed.
2599 ****************************************************************************/
2600
2601 static void mos7840_release(struct usb_serial *serial)
2602 {
2603 int i;
2604 struct moschip_port *mos7840_port;
2605 dbg("%s", " release :entering..........");
2606
2607 if (!serial) {
2608 dbg("%s", "Invalid Handler");
2609 return;
2610 }
2611
2612 /* check for the ports to be closed,close the ports and disconnect */
2613
2614 /* free private structure allocated for serial port *
2615 * stop reads and writes on all ports */
2616
2617 for (i = 0; i < serial->num_ports; ++i) {
2618 mos7840_port = mos7840_get_port_private(serial->port[i]);
2619 dbg("mos7840_port %d = %p", i, mos7840_port);
2620 if (mos7840_port) {
2621 kfree(mos7840_port->ctrl_buf);
2622 kfree(mos7840_port->dr);
2623 kfree(mos7840_port);
2624 }
2625 }
2626
2627 dbg("%s", "Thank u :: ");
2628
2629 }
2630
2631 static struct usb_driver io_driver = {
2632 .name = "mos7840",
2633 .probe = usb_serial_probe,
2634 .disconnect = usb_serial_disconnect,
2635 .id_table = moschip_id_table_combined,
2636 .no_dynamic_id = 1,
2637 };
2638
2639 static struct usb_serial_driver moschip7840_4port_device = {
2640 .driver = {
2641 .owner = THIS_MODULE,
2642 .name = "mos7840",
2643 },
2644 .description = DRIVER_DESC,
2645 .usb_driver = &io_driver,
2646 .id_table = moschip_port_id_table,
2647 .num_ports = 4,
2648 .open = mos7840_open,
2649 .close = mos7840_close,
2650 .write = mos7840_write,
2651 .write_room = mos7840_write_room,
2652 .chars_in_buffer = mos7840_chars_in_buffer,
2653 .throttle = mos7840_throttle,
2654 .unthrottle = mos7840_unthrottle,
2655 .calc_num_ports = mos7840_calc_num_ports,
2656 #ifdef MCSSerialProbe
2657 .probe = mos7840_serial_probe,
2658 #endif
2659 .ioctl = mos7840_ioctl,
2660 .set_termios = mos7840_set_termios,
2661 .break_ctl = mos7840_break,
2662 .tiocmget = mos7840_tiocmget,
2663 .tiocmset = mos7840_tiocmset,
2664 .attach = mos7840_startup,
2665 .disconnect = mos7840_disconnect,
2666 .release = mos7840_release,
2667 .read_bulk_callback = mos7840_bulk_in_callback,
2668 .read_int_callback = mos7840_interrupt_callback,
2669 };
2670
2671 /****************************************************************************
2672 * moschip7840_init
2673 * This is called by the module subsystem, or on startup to initialize us
2674 ****************************************************************************/
2675 static int __init moschip7840_init(void)
2676 {
2677 int retval;
2678
2679 dbg("%s", " mos7840_init :entering..........");
2680
2681 /* Register with the usb serial */
2682 retval = usb_serial_register(&moschip7840_4port_device);
2683
2684 if (retval)
2685 goto failed_port_device_register;
2686
2687 dbg("%s", "Entering...");
2688 printk(KERN_INFO KBUILD_MODNAME ": " DRIVER_VERSION ":"
2689 DRIVER_DESC "\n");
2690
2691 /* Register with the usb */
2692 retval = usb_register(&io_driver);
2693 if (retval == 0) {
2694 dbg("%s", "Leaving...");
2695 return 0;
2696 }
2697 usb_serial_deregister(&moschip7840_4port_device);
2698 failed_port_device_register:
2699 return retval;
2700 }
2701
2702 /****************************************************************************
2703 * moschip7840_exit
2704 * Called when the driver is about to be unloaded.
2705 ****************************************************************************/
2706 static void __exit moschip7840_exit(void)
2707 {
2708
2709 dbg("%s", " mos7840_exit :entering..........");
2710
2711 usb_deregister(&io_driver);
2712
2713 usb_serial_deregister(&moschip7840_4port_device);
2714
2715 dbg("%s", "Entering...");
2716 }
2717
2718 module_init(moschip7840_init);
2719 module_exit(moschip7840_exit);
2720
2721 /* Module information */
2722 MODULE_DESCRIPTION(DRIVER_DESC);
2723 MODULE_LICENSE("GPL");
2724
2725 module_param(debug, bool, S_IRUGO | S_IWUSR);
2726 MODULE_PARM_DESC(debug, "Debug enabled or not");
Linux with added FPC-III support