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Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/dtor/input
[deliverable/linux.git] / drivers / usb / serial / mos7840.c
1 /*
2 * This program is free software; you can redistribute it and/or modify
3 * it under the terms of the GNU General Public License as published by
4 * the Free Software Foundation; either version 2 of the License, or
5 * (at your option) any later version.
6 *
7 * This program is distributed in the hope that it will be useful,
8 * but WITHOUT ANY WARRANTY; without even the implied warranty of
9 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
10 * GNU General Public License for more details.
11 *
12 * You should have received a copy of the GNU General Public License
13 * along with this program; if not, write to the Free Software
14 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
15 *
16 * Clean ups from Moschip version and a few ioctl implementations by:
17 * Paul B Schroeder <pschroeder "at" uplogix "dot" com>
18 *
19 * Originally based on drivers/usb/serial/io_edgeport.c which is:
20 * Copyright (C) 2000 Inside Out Networks, All rights reserved.
21 * Copyright (C) 2001-2002 Greg Kroah-Hartman <greg@kroah.com>
22 *
23 */
24
25 #include <linux/kernel.h>
26 #include <linux/errno.h>
27 #include <linux/init.h>
28 #include <linux/slab.h>
29 #include <linux/tty.h>
30 #include <linux/tty_driver.h>
31 #include <linux/tty_flip.h>
32 #include <linux/module.h>
33 #include <linux/serial.h>
34 #include <linux/usb.h>
35 #include <linux/usb/serial.h>
36 #include <linux/uaccess.h>
37
38 /*
39 * Version Information
40 */
41 #define DRIVER_VERSION "1.3.2"
42 #define DRIVER_DESC "Moschip 7840/7820 USB Serial Driver"
43
44 /*
45 * 16C50 UART register defines
46 */
47
48 #define LCR_BITS_5 0x00 /* 5 bits/char */
49 #define LCR_BITS_6 0x01 /* 6 bits/char */
50 #define LCR_BITS_7 0x02 /* 7 bits/char */
51 #define LCR_BITS_8 0x03 /* 8 bits/char */
52 #define LCR_BITS_MASK 0x03 /* Mask for bits/char field */
53
54 #define LCR_STOP_1 0x00 /* 1 stop bit */
55 #define LCR_STOP_1_5 0x04 /* 1.5 stop bits (if 5 bits/char) */
56 #define LCR_STOP_2 0x04 /* 2 stop bits (if 6-8 bits/char) */
57 #define LCR_STOP_MASK 0x04 /* Mask for stop bits field */
58
59 #define LCR_PAR_NONE 0x00 /* No parity */
60 #define LCR_PAR_ODD 0x08 /* Odd parity */
61 #define LCR_PAR_EVEN 0x18 /* Even parity */
62 #define LCR_PAR_MARK 0x28 /* Force parity bit to 1 */
63 #define LCR_PAR_SPACE 0x38 /* Force parity bit to 0 */
64 #define LCR_PAR_MASK 0x38 /* Mask for parity field */
65
66 #define LCR_SET_BREAK 0x40 /* Set Break condition */
67 #define LCR_DL_ENABLE 0x80 /* Enable access to divisor latch */
68
69 #define MCR_DTR 0x01 /* Assert DTR */
70 #define MCR_RTS 0x02 /* Assert RTS */
71 #define MCR_OUT1 0x04 /* Loopback only: Sets state of RI */
72 #define MCR_MASTER_IE 0x08 /* Enable interrupt outputs */
73 #define MCR_LOOPBACK 0x10 /* Set internal (digital) loopback mode */
74 #define MCR_XON_ANY 0x20 /* Enable any char to exit XOFF mode */
75
76 #define MOS7840_MSR_CTS 0x10 /* Current state of CTS */
77 #define MOS7840_MSR_DSR 0x20 /* Current state of DSR */
78 #define MOS7840_MSR_RI 0x40 /* Current state of RI */
79 #define MOS7840_MSR_CD 0x80 /* Current state of CD */
80
81 /*
82 * Defines used for sending commands to port
83 */
84
85 #define WAIT_FOR_EVER (HZ * 0) /* timeout urb is wait for ever */
86 #define MOS_WDR_TIMEOUT (HZ * 5) /* default urb timeout */
87
88 #define MOS_PORT1 0x0200
89 #define MOS_PORT2 0x0300
90 #define MOS_VENREG 0x0000
91 #define MOS_MAX_PORT 0x02
92 #define MOS_WRITE 0x0E
93 #define MOS_READ 0x0D
94
95 /* Requests */
96 #define MCS_RD_RTYPE 0xC0
97 #define MCS_WR_RTYPE 0x40
98 #define MCS_RDREQ 0x0D
99 #define MCS_WRREQ 0x0E
100 #define MCS_CTRL_TIMEOUT 500
101 #define VENDOR_READ_LENGTH (0x01)
102
103 #define MAX_NAME_LEN 64
104
105 #define ZLP_REG1 0x3A /* Zero_Flag_Reg1 58 */
106 #define ZLP_REG5 0x3E /* Zero_Flag_Reg5 62 */
107
108 /* For higher baud Rates use TIOCEXBAUD */
109 #define TIOCEXBAUD 0x5462
110
111 /* vendor id and device id defines */
112
113 /* The native mos7840/7820 component */
114 #define USB_VENDOR_ID_MOSCHIP 0x9710
115 #define MOSCHIP_DEVICE_ID_7840 0x7840
116 #define MOSCHIP_DEVICE_ID_7820 0x7820
117 /* The native component can have its vendor/device id's overridden
118 * in vendor-specific implementations. Such devices can be handled
119 * by making a change here, in moschip_port_id_table, and in
120 * moschip_id_table_combined
121 */
122 #define USB_VENDOR_ID_BANDB 0x0856
123 #define BANDB_DEVICE_ID_USO9ML2_2 0xAC22
124 #define BANDB_DEVICE_ID_USO9ML2_4 0xAC24
125 #define BANDB_DEVICE_ID_US9ML2_2 0xAC29
126 #define BANDB_DEVICE_ID_US9ML2_4 0xAC30
127 #define BANDB_DEVICE_ID_USPTL4_2 0xAC31
128 #define BANDB_DEVICE_ID_USPTL4_4 0xAC32
129 #define BANDB_DEVICE_ID_USOPTL4_2 0xAC42
130 #define BANDB_DEVICE_ID_USOPTL4_4 0xAC44
131 #define BANDB_DEVICE_ID_USOPTL2_4 0xAC24
132
133 /* This driver also supports
134 * ATEN UC2324 device using Moschip MCS7840
135 * ATEN UC2322 device using Moschip MCS7820
136 */
137 #define USB_VENDOR_ID_ATENINTL 0x0557
138 #define ATENINTL_DEVICE_ID_UC2324 0x2011
139 #define ATENINTL_DEVICE_ID_UC2322 0x7820
140
141 /* Interrupt Routine Defines */
142
143 #define SERIAL_IIR_RLS 0x06
144 #define SERIAL_IIR_MS 0x00
145
146 /*
147 * Emulation of the bit mask on the LINE STATUS REGISTER.
148 */
149 #define SERIAL_LSR_DR 0x0001
150 #define SERIAL_LSR_OE 0x0002
151 #define SERIAL_LSR_PE 0x0004
152 #define SERIAL_LSR_FE 0x0008
153 #define SERIAL_LSR_BI 0x0010
154
155 #define MOS_MSR_DELTA_CTS 0x10
156 #define MOS_MSR_DELTA_DSR 0x20
157 #define MOS_MSR_DELTA_RI 0x40
158 #define MOS_MSR_DELTA_CD 0x80
159
160 /* Serial Port register Address */
161 #define INTERRUPT_ENABLE_REGISTER ((__u16)(0x01))
162 #define FIFO_CONTROL_REGISTER ((__u16)(0x02))
163 #define LINE_CONTROL_REGISTER ((__u16)(0x03))
164 #define MODEM_CONTROL_REGISTER ((__u16)(0x04))
165 #define LINE_STATUS_REGISTER ((__u16)(0x05))
166 #define MODEM_STATUS_REGISTER ((__u16)(0x06))
167 #define SCRATCH_PAD_REGISTER ((__u16)(0x07))
168 #define DIVISOR_LATCH_LSB ((__u16)(0x00))
169 #define DIVISOR_LATCH_MSB ((__u16)(0x01))
170
171 #define CLK_MULTI_REGISTER ((__u16)(0x02))
172 #define CLK_START_VALUE_REGISTER ((__u16)(0x03))
173
174 #define SERIAL_LCR_DLAB ((__u16)(0x0080))
175
176 /*
177 * URB POOL related defines
178 */
179 #define NUM_URBS 16 /* URB Count */
180 #define URB_TRANSFER_BUFFER_SIZE 32 /* URB Size */
181
182
183 static const struct usb_device_id moschip_port_id_table[] = {
184 {USB_DEVICE(USB_VENDOR_ID_MOSCHIP, MOSCHIP_DEVICE_ID_7840)},
185 {USB_DEVICE(USB_VENDOR_ID_MOSCHIP, MOSCHIP_DEVICE_ID_7820)},
186 {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USO9ML2_2)},
187 {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USO9ML2_4)},
188 {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_US9ML2_2)},
189 {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_US9ML2_4)},
190 {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USPTL4_2)},
191 {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USPTL4_4)},
192 {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USOPTL4_2)},
193 {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USOPTL4_4)},
194 {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USOPTL2_4)},
195 {USB_DEVICE(USB_VENDOR_ID_ATENINTL, ATENINTL_DEVICE_ID_UC2324)},
196 {USB_DEVICE(USB_VENDOR_ID_ATENINTL, ATENINTL_DEVICE_ID_UC2322)},
197 {} /* terminating entry */
198 };
199
200 static const struct usb_device_id moschip_id_table_combined[] __devinitconst = {
201 {USB_DEVICE(USB_VENDOR_ID_MOSCHIP, MOSCHIP_DEVICE_ID_7840)},
202 {USB_DEVICE(USB_VENDOR_ID_MOSCHIP, MOSCHIP_DEVICE_ID_7820)},
203 {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USO9ML2_2)},
204 {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USO9ML2_4)},
205 {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_US9ML2_2)},
206 {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_US9ML2_4)},
207 {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USPTL4_2)},
208 {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USPTL4_4)},
209 {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USOPTL4_2)},
210 {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USOPTL4_4)},
211 {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USOPTL2_4)},
212 {USB_DEVICE(USB_VENDOR_ID_ATENINTL, ATENINTL_DEVICE_ID_UC2324)},
213 {USB_DEVICE(USB_VENDOR_ID_ATENINTL, ATENINTL_DEVICE_ID_UC2322)},
214 {} /* terminating entry */
215 };
216
217 MODULE_DEVICE_TABLE(usb, moschip_id_table_combined);
218
219 /* This structure holds all of the local port information */
220
221 struct moschip_port {
222 int port_num; /*Actual port number in the device(1,2,etc) */
223 struct urb *write_urb; /* write URB for this port */
224 struct urb *read_urb; /* read URB for this port */
225 struct urb *int_urb;
226 __u8 shadowLCR; /* last LCR value received */
227 __u8 shadowMCR; /* last MCR value received */
228 char open;
229 char open_ports;
230 char zombie;
231 wait_queue_head_t wait_chase; /* for handling sleeping while waiting for chase to finish */
232 wait_queue_head_t delta_msr_wait; /* for handling sleeping while waiting for msr change to happen */
233 int delta_msr_cond;
234 struct async_icount icount;
235 struct usb_serial_port *port; /* loop back to the owner of this object */
236
237 /* Offsets */
238 __u8 SpRegOffset;
239 __u8 ControlRegOffset;
240 __u8 DcrRegOffset;
241 /* for processing control URBS in interrupt context */
242 struct urb *control_urb;
243 struct usb_ctrlrequest *dr;
244 char *ctrl_buf;
245 int MsrLsr;
246
247 spinlock_t pool_lock;
248 struct urb *write_urb_pool[NUM_URBS];
249 char busy[NUM_URBS];
250 bool read_urb_busy;
251 };
252
253
254 static int debug;
255
256 /*
257 * mos7840_set_reg_sync
258 * To set the Control register by calling usb_fill_control_urb function
259 * by passing usb_sndctrlpipe function as parameter.
260 */
261
262 static int mos7840_set_reg_sync(struct usb_serial_port *port, __u16 reg,
263 __u16 val)
264 {
265 struct usb_device *dev = port->serial->dev;
266 val = val & 0x00ff;
267 dbg("mos7840_set_reg_sync offset is %x, value %x", reg, val);
268
269 return usb_control_msg(dev, usb_sndctrlpipe(dev, 0), MCS_WRREQ,
270 MCS_WR_RTYPE, val, reg, NULL, 0,
271 MOS_WDR_TIMEOUT);
272 }
273
274 /*
275 * mos7840_get_reg_sync
276 * To set the Uart register by calling usb_fill_control_urb function by
277 * passing usb_rcvctrlpipe function as parameter.
278 */
279
280 static int mos7840_get_reg_sync(struct usb_serial_port *port, __u16 reg,
281 __u16 *val)
282 {
283 struct usb_device *dev = port->serial->dev;
284 int ret = 0;
285 u8 *buf;
286
287 buf = kmalloc(VENDOR_READ_LENGTH, GFP_KERNEL);
288 if (!buf)
289 return -ENOMEM;
290
291 ret = usb_control_msg(dev, usb_rcvctrlpipe(dev, 0), MCS_RDREQ,
292 MCS_RD_RTYPE, 0, reg, buf, VENDOR_READ_LENGTH,
293 MOS_WDR_TIMEOUT);
294 *val = buf[0];
295 dbg("mos7840_get_reg_sync offset is %x, return val %x", reg, *val);
296
297 kfree(buf);
298 return ret;
299 }
300
301 /*
302 * mos7840_set_uart_reg
303 * To set the Uart register by calling usb_fill_control_urb function by
304 * passing usb_sndctrlpipe function as parameter.
305 */
306
307 static int mos7840_set_uart_reg(struct usb_serial_port *port, __u16 reg,
308 __u16 val)
309 {
310
311 struct usb_device *dev = port->serial->dev;
312 val = val & 0x00ff;
313 /* For the UART control registers, the application number need
314 to be Or'ed */
315 if (port->serial->num_ports == 4) {
316 val |= (((__u16) port->number -
317 (__u16) (port->serial->minor)) + 1) << 8;
318 dbg("mos7840_set_uart_reg application number is %x", val);
319 } else {
320 if (((__u16) port->number - (__u16) (port->serial->minor)) == 0) {
321 val |= (((__u16) port->number -
322 (__u16) (port->serial->minor)) + 1) << 8;
323 dbg("mos7840_set_uart_reg application number is %x",
324 val);
325 } else {
326 val |=
327 (((__u16) port->number -
328 (__u16) (port->serial->minor)) + 2) << 8;
329 dbg("mos7840_set_uart_reg application number is %x",
330 val);
331 }
332 }
333 return usb_control_msg(dev, usb_sndctrlpipe(dev, 0), MCS_WRREQ,
334 MCS_WR_RTYPE, val, reg, NULL, 0,
335 MOS_WDR_TIMEOUT);
336
337 }
338
339 /*
340 * mos7840_get_uart_reg
341 * To set the Control register by calling usb_fill_control_urb function
342 * by passing usb_rcvctrlpipe function as parameter.
343 */
344 static int mos7840_get_uart_reg(struct usb_serial_port *port, __u16 reg,
345 __u16 *val)
346 {
347 struct usb_device *dev = port->serial->dev;
348 int ret = 0;
349 __u16 Wval;
350 u8 *buf;
351
352 buf = kmalloc(VENDOR_READ_LENGTH, GFP_KERNEL);
353 if (!buf)
354 return -ENOMEM;
355
356 /* dbg("application number is %4x",
357 (((__u16)port->number - (__u16)(port->serial->minor))+1)<<8); */
358 /* Wval is same as application number */
359 if (port->serial->num_ports == 4) {
360 Wval =
361 (((__u16) port->number - (__u16) (port->serial->minor)) +
362 1) << 8;
363 dbg("mos7840_get_uart_reg application number is %x", Wval);
364 } else {
365 if (((__u16) port->number - (__u16) (port->serial->minor)) == 0) {
366 Wval = (((__u16) port->number -
367 (__u16) (port->serial->minor)) + 1) << 8;
368 dbg("mos7840_get_uart_reg application number is %x",
369 Wval);
370 } else {
371 Wval = (((__u16) port->number -
372 (__u16) (port->serial->minor)) + 2) << 8;
373 dbg("mos7840_get_uart_reg application number is %x",
374 Wval);
375 }
376 }
377 ret = usb_control_msg(dev, usb_rcvctrlpipe(dev, 0), MCS_RDREQ,
378 MCS_RD_RTYPE, Wval, reg, buf, VENDOR_READ_LENGTH,
379 MOS_WDR_TIMEOUT);
380 *val = buf[0];
381
382 kfree(buf);
383 return ret;
384 }
385
386 static void mos7840_dump_serial_port(struct moschip_port *mos7840_port)
387 {
388
389 dbg("***************************************");
390 dbg("SpRegOffset is %2x", mos7840_port->SpRegOffset);
391 dbg("ControlRegOffset is %2x", mos7840_port->ControlRegOffset);
392 dbg("DCRRegOffset is %2x", mos7840_port->DcrRegOffset);
393 dbg("***************************************");
394
395 }
396
397 /************************************************************************/
398 /************************************************************************/
399 /* I N T E R F A C E F U N C T I O N S */
400 /* I N T E R F A C E F U N C T I O N S */
401 /************************************************************************/
402 /************************************************************************/
403
404 static inline void mos7840_set_port_private(struct usb_serial_port *port,
405 struct moschip_port *data)
406 {
407 usb_set_serial_port_data(port, (void *)data);
408 }
409
410 static inline struct moschip_port *mos7840_get_port_private(struct
411 usb_serial_port
412 *port)
413 {
414 return (struct moschip_port *)usb_get_serial_port_data(port);
415 }
416
417 static void mos7840_handle_new_msr(struct moschip_port *port, __u8 new_msr)
418 {
419 struct moschip_port *mos7840_port;
420 struct async_icount *icount;
421 mos7840_port = port;
422 icount = &mos7840_port->icount;
423 if (new_msr &
424 (MOS_MSR_DELTA_CTS | MOS_MSR_DELTA_DSR | MOS_MSR_DELTA_RI |
425 MOS_MSR_DELTA_CD)) {
426 icount = &mos7840_port->icount;
427
428 /* update input line counters */
429 if (new_msr & MOS_MSR_DELTA_CTS) {
430 icount->cts++;
431 smp_wmb();
432 }
433 if (new_msr & MOS_MSR_DELTA_DSR) {
434 icount->dsr++;
435 smp_wmb();
436 }
437 if (new_msr & MOS_MSR_DELTA_CD) {
438 icount->dcd++;
439 smp_wmb();
440 }
441 if (new_msr & MOS_MSR_DELTA_RI) {
442 icount->rng++;
443 smp_wmb();
444 }
445 }
446 }
447
448 static void mos7840_handle_new_lsr(struct moschip_port *port, __u8 new_lsr)
449 {
450 struct async_icount *icount;
451
452 dbg("%s - %02x", __func__, new_lsr);
453
454 if (new_lsr & SERIAL_LSR_BI) {
455 /*
456 * Parity and Framing errors only count if they
457 * occur exclusive of a break being
458 * received.
459 */
460 new_lsr &= (__u8) (SERIAL_LSR_OE | SERIAL_LSR_BI);
461 }
462
463 /* update input line counters */
464 icount = &port->icount;
465 if (new_lsr & SERIAL_LSR_BI) {
466 icount->brk++;
467 smp_wmb();
468 }
469 if (new_lsr & SERIAL_LSR_OE) {
470 icount->overrun++;
471 smp_wmb();
472 }
473 if (new_lsr & SERIAL_LSR_PE) {
474 icount->parity++;
475 smp_wmb();
476 }
477 if (new_lsr & SERIAL_LSR_FE) {
478 icount->frame++;
479 smp_wmb();
480 }
481 }
482
483 /************************************************************************/
484 /************************************************************************/
485 /* U S B C A L L B A C K F U N C T I O N S */
486 /* U S B C A L L B A C K F U N C T I O N S */
487 /************************************************************************/
488 /************************************************************************/
489
490 static void mos7840_control_callback(struct urb *urb)
491 {
492 unsigned char *data;
493 struct moschip_port *mos7840_port;
494 __u8 regval = 0x0;
495 int result = 0;
496 int status = urb->status;
497
498 mos7840_port = urb->context;
499
500 switch (status) {
501 case 0:
502 /* success */
503 break;
504 case -ECONNRESET:
505 case -ENOENT:
506 case -ESHUTDOWN:
507 /* this urb is terminated, clean up */
508 dbg("%s - urb shutting down with status: %d", __func__,
509 status);
510 return;
511 default:
512 dbg("%s - nonzero urb status received: %d", __func__,
513 status);
514 goto exit;
515 }
516
517 dbg("%s urb buffer size is %d", __func__, urb->actual_length);
518 dbg("%s mos7840_port->MsrLsr is %d port %d", __func__,
519 mos7840_port->MsrLsr, mos7840_port->port_num);
520 data = urb->transfer_buffer;
521 regval = (__u8) data[0];
522 dbg("%s data is %x", __func__, regval);
523 if (mos7840_port->MsrLsr == 0)
524 mos7840_handle_new_msr(mos7840_port, regval);
525 else if (mos7840_port->MsrLsr == 1)
526 mos7840_handle_new_lsr(mos7840_port, regval);
527
528 exit:
529 spin_lock(&mos7840_port->pool_lock);
530 if (!mos7840_port->zombie)
531 result = usb_submit_urb(mos7840_port->int_urb, GFP_ATOMIC);
532 spin_unlock(&mos7840_port->pool_lock);
533 if (result) {
534 dev_err(&urb->dev->dev,
535 "%s - Error %d submitting interrupt urb\n",
536 __func__, result);
537 }
538 }
539
540 static int mos7840_get_reg(struct moschip_port *mcs, __u16 Wval, __u16 reg,
541 __u16 *val)
542 {
543 struct usb_device *dev = mcs->port->serial->dev;
544 struct usb_ctrlrequest *dr = mcs->dr;
545 unsigned char *buffer = mcs->ctrl_buf;
546 int ret;
547
548 dr->bRequestType = MCS_RD_RTYPE;
549 dr->bRequest = MCS_RDREQ;
550 dr->wValue = cpu_to_le16(Wval); /* 0 */
551 dr->wIndex = cpu_to_le16(reg);
552 dr->wLength = cpu_to_le16(2);
553
554 usb_fill_control_urb(mcs->control_urb, dev, usb_rcvctrlpipe(dev, 0),
555 (unsigned char *)dr, buffer, 2,
556 mos7840_control_callback, mcs);
557 mcs->control_urb->transfer_buffer_length = 2;
558 ret = usb_submit_urb(mcs->control_urb, GFP_ATOMIC);
559 return ret;
560 }
561
562 /*****************************************************************************
563 * mos7840_interrupt_callback
564 * this is the callback function for when we have received data on the
565 * interrupt endpoint.
566 *****************************************************************************/
567
568 static void mos7840_interrupt_callback(struct urb *urb)
569 {
570 int result;
571 int length;
572 struct moschip_port *mos7840_port;
573 struct usb_serial *serial;
574 __u16 Data;
575 unsigned char *data;
576 __u8 sp[5], st;
577 int i, rv = 0;
578 __u16 wval, wreg = 0;
579 int status = urb->status;
580
581 dbg("%s", " : Entering");
582
583 switch (status) {
584 case 0:
585 /* success */
586 break;
587 case -ECONNRESET:
588 case -ENOENT:
589 case -ESHUTDOWN:
590 /* this urb is terminated, clean up */
591 dbg("%s - urb shutting down with status: %d", __func__,
592 status);
593 return;
594 default:
595 dbg("%s - nonzero urb status received: %d", __func__,
596 status);
597 goto exit;
598 }
599
600 length = urb->actual_length;
601 data = urb->transfer_buffer;
602
603 serial = urb->context;
604
605 /* Moschip get 5 bytes
606 * Byte 1 IIR Port 1 (port.number is 0)
607 * Byte 2 IIR Port 2 (port.number is 1)
608 * Byte 3 IIR Port 3 (port.number is 2)
609 * Byte 4 IIR Port 4 (port.number is 3)
610 * Byte 5 FIFO status for both */
611
612 if (length && length > 5) {
613 dbg("%s", "Wrong data !!!");
614 return;
615 }
616
617 sp[0] = (__u8) data[0];
618 sp[1] = (__u8) data[1];
619 sp[2] = (__u8) data[2];
620 sp[3] = (__u8) data[3];
621 st = (__u8) data[4];
622
623 for (i = 0; i < serial->num_ports; i++) {
624 mos7840_port = mos7840_get_port_private(serial->port[i]);
625 wval =
626 (((__u16) serial->port[i]->number -
627 (__u16) (serial->minor)) + 1) << 8;
628 if (mos7840_port->open) {
629 if (sp[i] & 0x01) {
630 dbg("SP%d No Interrupt !!!", i);
631 } else {
632 switch (sp[i] & 0x0f) {
633 case SERIAL_IIR_RLS:
634 dbg("Serial Port %d: Receiver status error or ", i);
635 dbg("address bit detected in 9-bit mode");
636 mos7840_port->MsrLsr = 1;
637 wreg = LINE_STATUS_REGISTER;
638 break;
639 case SERIAL_IIR_MS:
640 dbg("Serial Port %d: Modem status change", i);
641 mos7840_port->MsrLsr = 0;
642 wreg = MODEM_STATUS_REGISTER;
643 break;
644 }
645 spin_lock(&mos7840_port->pool_lock);
646 if (!mos7840_port->zombie) {
647 rv = mos7840_get_reg(mos7840_port, wval, wreg, &Data);
648 } else {
649 spin_unlock(&mos7840_port->pool_lock);
650 return;
651 }
652 spin_unlock(&mos7840_port->pool_lock);
653 }
654 }
655 }
656 if (!(rv < 0))
657 /* the completion handler for the control urb will resubmit */
658 return;
659 exit:
660 result = usb_submit_urb(urb, GFP_ATOMIC);
661 if (result) {
662 dev_err(&urb->dev->dev,
663 "%s - Error %d submitting interrupt urb\n",
664 __func__, result);
665 }
666 }
667
668 static int mos7840_port_paranoia_check(struct usb_serial_port *port,
669 const char *function)
670 {
671 if (!port) {
672 dbg("%s - port == NULL", function);
673 return -1;
674 }
675 if (!port->serial) {
676 dbg("%s - port->serial == NULL", function);
677 return -1;
678 }
679
680 return 0;
681 }
682
683 /* Inline functions to check the sanity of a pointer that is passed to us */
684 static int mos7840_serial_paranoia_check(struct usb_serial *serial,
685 const char *function)
686 {
687 if (!serial) {
688 dbg("%s - serial == NULL", function);
689 return -1;
690 }
691 if (!serial->type) {
692 dbg("%s - serial->type == NULL!", function);
693 return -1;
694 }
695
696 return 0;
697 }
698
699 static struct usb_serial *mos7840_get_usb_serial(struct usb_serial_port *port,
700 const char *function)
701 {
702 /* if no port was specified, or it fails a paranoia check */
703 if (!port ||
704 mos7840_port_paranoia_check(port, function) ||
705 mos7840_serial_paranoia_check(port->serial, function)) {
706 /* then say that we don't have a valid usb_serial thing,
707 * which will end up genrating -ENODEV return values */
708 return NULL;
709 }
710
711 return port->serial;
712 }
713
714 /*****************************************************************************
715 * mos7840_bulk_in_callback
716 * this is the callback function for when we have received data on the
717 * bulk in endpoint.
718 *****************************************************************************/
719
720 static void mos7840_bulk_in_callback(struct urb *urb)
721 {
722 int retval;
723 unsigned char *data;
724 struct usb_serial *serial;
725 struct usb_serial_port *port;
726 struct moschip_port *mos7840_port;
727 struct tty_struct *tty;
728 int status = urb->status;
729
730 mos7840_port = urb->context;
731 if (!mos7840_port) {
732 dbg("%s", "NULL mos7840_port pointer");
733 mos7840_port->read_urb_busy = false;
734 return;
735 }
736
737 if (status) {
738 dbg("nonzero read bulk status received: %d", status);
739 mos7840_port->read_urb_busy = false;
740 return;
741 }
742
743 port = (struct usb_serial_port *)mos7840_port->port;
744 if (mos7840_port_paranoia_check(port, __func__)) {
745 dbg("%s", "Port Paranoia failed");
746 mos7840_port->read_urb_busy = false;
747 return;
748 }
749
750 serial = mos7840_get_usb_serial(port, __func__);
751 if (!serial) {
752 dbg("%s", "Bad serial pointer");
753 mos7840_port->read_urb_busy = false;
754 return;
755 }
756
757 dbg("%s", "Entering... ");
758
759 data = urb->transfer_buffer;
760
761 dbg("%s", "Entering ...........");
762
763 if (urb->actual_length) {
764 tty = tty_port_tty_get(&mos7840_port->port->port);
765 if (tty) {
766 tty_insert_flip_string(tty, data, urb->actual_length);
767 dbg(" %s ", data);
768 tty_flip_buffer_push(tty);
769 tty_kref_put(tty);
770 }
771 mos7840_port->icount.rx += urb->actual_length;
772 smp_wmb();
773 dbg("mos7840_port->icount.rx is %d:",
774 mos7840_port->icount.rx);
775 }
776
777 if (!mos7840_port->read_urb) {
778 dbg("%s", "URB KILLED !!!");
779 mos7840_port->read_urb_busy = false;
780 return;
781 }
782
783
784 mos7840_port->read_urb->dev = serial->dev;
785
786 mos7840_port->read_urb_busy = true;
787 retval = usb_submit_urb(mos7840_port->read_urb, GFP_ATOMIC);
788
789 if (retval) {
790 dbg("usb_submit_urb(read bulk) failed, retval = %d", retval);
791 mos7840_port->read_urb_busy = false;
792 }
793 }
794
795 /*****************************************************************************
796 * mos7840_bulk_out_data_callback
797 * this is the callback function for when we have finished sending
798 * serial data on the bulk out endpoint.
799 *****************************************************************************/
800
801 static void mos7840_bulk_out_data_callback(struct urb *urb)
802 {
803 struct moschip_port *mos7840_port;
804 struct tty_struct *tty;
805 int status = urb->status;
806 int i;
807
808 mos7840_port = urb->context;
809 spin_lock(&mos7840_port->pool_lock);
810 for (i = 0; i < NUM_URBS; i++) {
811 if (urb == mos7840_port->write_urb_pool[i]) {
812 mos7840_port->busy[i] = 0;
813 break;
814 }
815 }
816 spin_unlock(&mos7840_port->pool_lock);
817
818 if (status) {
819 dbg("nonzero write bulk status received:%d", status);
820 return;
821 }
822
823 if (mos7840_port_paranoia_check(mos7840_port->port, __func__)) {
824 dbg("%s", "Port Paranoia failed");
825 return;
826 }
827
828 dbg("%s", "Entering .........");
829
830 tty = tty_port_tty_get(&mos7840_port->port->port);
831 if (tty && mos7840_port->open)
832 tty_wakeup(tty);
833 tty_kref_put(tty);
834
835 }
836
837 /************************************************************************/
838 /* 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 */
839 /************************************************************************/
840 #ifdef MCSSerialProbe
841 static int mos7840_serial_probe(struct usb_serial *serial,
842 const struct usb_device_id *id)
843 {
844
845 /*need to implement the mode_reg reading and updating\
846 structures usb_serial_ device_type\
847 (i.e num_ports, num_bulkin,bulkout etc) */
848 /* Also we can update the changes attach */
849 return 1;
850 }
851 #endif
852
853 /*****************************************************************************
854 * mos7840_open
855 * this function is called by the tty driver when a port is opened
856 * If successful, we return 0
857 * Otherwise we return a negative error number.
858 *****************************************************************************/
859
860 static int mos7840_open(struct tty_struct *tty, struct usb_serial_port *port)
861 {
862 int response;
863 int j;
864 struct usb_serial *serial;
865 struct urb *urb;
866 __u16 Data;
867 int status;
868 struct moschip_port *mos7840_port;
869 struct moschip_port *port0;
870
871 dbg ("%s enter", __func__);
872
873 if (mos7840_port_paranoia_check(port, __func__)) {
874 dbg("%s", "Port Paranoia failed");
875 return -ENODEV;
876 }
877
878 serial = port->serial;
879
880 if (mos7840_serial_paranoia_check(serial, __func__)) {
881 dbg("%s", "Serial Paranoia failed");
882 return -ENODEV;
883 }
884
885 mos7840_port = mos7840_get_port_private(port);
886 port0 = mos7840_get_port_private(serial->port[0]);
887
888 if (mos7840_port == NULL || port0 == NULL)
889 return -ENODEV;
890
891 usb_clear_halt(serial->dev, port->write_urb->pipe);
892 usb_clear_halt(serial->dev, port->read_urb->pipe);
893 port0->open_ports++;
894
895 /* Initialising the write urb pool */
896 for (j = 0; j < NUM_URBS; ++j) {
897 urb = usb_alloc_urb(0, GFP_KERNEL);
898 mos7840_port->write_urb_pool[j] = urb;
899
900 if (urb == NULL) {
901 dev_err(&port->dev, "No more urbs???\n");
902 continue;
903 }
904
905 urb->transfer_buffer = kmalloc(URB_TRANSFER_BUFFER_SIZE,
906 GFP_KERNEL);
907 if (!urb->transfer_buffer) {
908 usb_free_urb(urb);
909 mos7840_port->write_urb_pool[j] = NULL;
910 dev_err(&port->dev,
911 "%s-out of memory for urb buffers.\n",
912 __func__);
913 continue;
914 }
915 }
916
917 /*****************************************************************************
918 * Initialize MCS7840 -- Write Init values to corresponding Registers
919 *
920 * Register Index
921 * 1 : IER
922 * 2 : FCR
923 * 3 : LCR
924 * 4 : MCR
925 *
926 * 0x08 : SP1/2 Control Reg
927 *****************************************************************************/
928
929 /* NEED to check the following Block */
930
931 Data = 0x0;
932 status = mos7840_get_reg_sync(port, mos7840_port->SpRegOffset, &Data);
933 if (status < 0) {
934 dbg("Reading Spreg failed");
935 return -1;
936 }
937 Data |= 0x80;
938 status = mos7840_set_reg_sync(port, mos7840_port->SpRegOffset, Data);
939 if (status < 0) {
940 dbg("writing Spreg failed");
941 return -1;
942 }
943
944 Data &= ~0x80;
945 status = mos7840_set_reg_sync(port, mos7840_port->SpRegOffset, Data);
946 if (status < 0) {
947 dbg("writing Spreg failed");
948 return -1;
949 }
950 /* End of block to be checked */
951
952 Data = 0x0;
953 status = mos7840_get_reg_sync(port, mos7840_port->ControlRegOffset,
954 &Data);
955 if (status < 0) {
956 dbg("Reading Controlreg failed");
957 return -1;
958 }
959 Data |= 0x08; /* Driver done bit */
960 Data |= 0x20; /* rx_disable */
961 status = mos7840_set_reg_sync(port,
962 mos7840_port->ControlRegOffset, Data);
963 if (status < 0) {
964 dbg("writing Controlreg failed");
965 return -1;
966 }
967 /* do register settings here */
968 /* Set all regs to the device default values. */
969 /***********************************
970 * First Disable all interrupts.
971 ***********************************/
972 Data = 0x00;
973 status = mos7840_set_uart_reg(port, INTERRUPT_ENABLE_REGISTER, Data);
974 if (status < 0) {
975 dbg("disabling interrupts failed");
976 return -1;
977 }
978 /* Set FIFO_CONTROL_REGISTER to the default value */
979 Data = 0x00;
980 status = mos7840_set_uart_reg(port, FIFO_CONTROL_REGISTER, Data);
981 if (status < 0) {
982 dbg("Writing FIFO_CONTROL_REGISTER failed");
983 return -1;
984 }
985
986 Data = 0xcf;
987 status = mos7840_set_uart_reg(port, FIFO_CONTROL_REGISTER, Data);
988 if (status < 0) {
989 dbg("Writing FIFO_CONTROL_REGISTER failed");
990 return -1;
991 }
992
993 Data = 0x03;
994 status = mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data);
995 mos7840_port->shadowLCR = Data;
996
997 Data = 0x0b;
998 status = mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER, Data);
999 mos7840_port->shadowMCR = Data;
1000
1001 Data = 0x00;
1002 status = mos7840_get_uart_reg(port, LINE_CONTROL_REGISTER, &Data);
1003 mos7840_port->shadowLCR = Data;
1004
1005 Data |= SERIAL_LCR_DLAB; /* data latch enable in LCR 0x80 */
1006 status = mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data);
1007
1008 Data = 0x0c;
1009 status = mos7840_set_uart_reg(port, DIVISOR_LATCH_LSB, Data);
1010
1011 Data = 0x0;
1012 status = mos7840_set_uart_reg(port, DIVISOR_LATCH_MSB, Data);
1013
1014 Data = 0x00;
1015 status = mos7840_get_uart_reg(port, LINE_CONTROL_REGISTER, &Data);
1016
1017 Data = Data & ~SERIAL_LCR_DLAB;
1018 status = mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data);
1019 mos7840_port->shadowLCR = Data;
1020
1021 /* clearing Bulkin and Bulkout Fifo */
1022 Data = 0x0;
1023 status = mos7840_get_reg_sync(port, mos7840_port->SpRegOffset, &Data);
1024
1025 Data = Data | 0x0c;
1026 status = mos7840_set_reg_sync(port, mos7840_port->SpRegOffset, Data);
1027
1028 Data = Data & ~0x0c;
1029 status = mos7840_set_reg_sync(port, mos7840_port->SpRegOffset, Data);
1030 /* Finally enable all interrupts */
1031 Data = 0x0c;
1032 status = mos7840_set_uart_reg(port, INTERRUPT_ENABLE_REGISTER, Data);
1033
1034 /* clearing rx_disable */
1035 Data = 0x0;
1036 status = mos7840_get_reg_sync(port, mos7840_port->ControlRegOffset,
1037 &Data);
1038 Data = Data & ~0x20;
1039 status = mos7840_set_reg_sync(port, mos7840_port->ControlRegOffset,
1040 Data);
1041
1042 /* rx_negate */
1043 Data = 0x0;
1044 status = mos7840_get_reg_sync(port, mos7840_port->ControlRegOffset,
1045 &Data);
1046 Data = Data | 0x10;
1047 status = mos7840_set_reg_sync(port, mos7840_port->ControlRegOffset,
1048 Data);
1049
1050 /* Check to see if we've set up our endpoint info yet *
1051 * (can't set it up in mos7840_startup as the structures *
1052 * were not set up at that time.) */
1053 if (port0->open_ports == 1) {
1054 if (serial->port[0]->interrupt_in_buffer == NULL) {
1055 /* set up interrupt urb */
1056 usb_fill_int_urb(serial->port[0]->interrupt_in_urb,
1057 serial->dev,
1058 usb_rcvintpipe(serial->dev,
1059 serial->port[0]->interrupt_in_endpointAddress),
1060 serial->port[0]->interrupt_in_buffer,
1061 serial->port[0]->interrupt_in_urb->
1062 transfer_buffer_length,
1063 mos7840_interrupt_callback,
1064 serial,
1065 serial->port[0]->interrupt_in_urb->interval);
1066
1067 /* start interrupt read for mos7840 *
1068 * will continue as long as mos7840 is connected */
1069
1070 response =
1071 usb_submit_urb(serial->port[0]->interrupt_in_urb,
1072 GFP_KERNEL);
1073 if (response) {
1074 dev_err(&port->dev, "%s - Error %d submitting "
1075 "interrupt urb\n", __func__, response);
1076 }
1077
1078 }
1079
1080 }
1081
1082 /* see if we've set up our endpoint info yet *
1083 * (can't set it up in mos7840_startup as the *
1084 * structures were not set up at that time.) */
1085
1086 dbg("port number is %d", port->number);
1087 dbg("serial number is %d", port->serial->minor);
1088 dbg("Bulkin endpoint is %d", port->bulk_in_endpointAddress);
1089 dbg("BulkOut endpoint is %d", port->bulk_out_endpointAddress);
1090 dbg("Interrupt endpoint is %d", port->interrupt_in_endpointAddress);
1091 dbg("port's number in the device is %d", mos7840_port->port_num);
1092 mos7840_port->read_urb = port->read_urb;
1093
1094 /* set up our bulk in urb */
1095
1096 usb_fill_bulk_urb(mos7840_port->read_urb,
1097 serial->dev,
1098 usb_rcvbulkpipe(serial->dev,
1099 port->bulk_in_endpointAddress),
1100 port->bulk_in_buffer,
1101 mos7840_port->read_urb->transfer_buffer_length,
1102 mos7840_bulk_in_callback, mos7840_port);
1103
1104 dbg("mos7840_open: bulkin endpoint is %d",
1105 port->bulk_in_endpointAddress);
1106 mos7840_port->read_urb_busy = true;
1107 response = usb_submit_urb(mos7840_port->read_urb, GFP_KERNEL);
1108 if (response) {
1109 dev_err(&port->dev, "%s - Error %d submitting control urb\n",
1110 __func__, response);
1111 mos7840_port->read_urb_busy = false;
1112 }
1113
1114 /* initialize our wait queues */
1115 init_waitqueue_head(&mos7840_port->wait_chase);
1116 init_waitqueue_head(&mos7840_port->delta_msr_wait);
1117
1118 /* initialize our icount structure */
1119 memset(&(mos7840_port->icount), 0x00, sizeof(mos7840_port->icount));
1120
1121 /* initialize our port settings */
1122 /* Must set to enable ints! */
1123 mos7840_port->shadowMCR = MCR_MASTER_IE;
1124 /* send a open port command */
1125 mos7840_port->open = 1;
1126 /* mos7840_change_port_settings(mos7840_port,old_termios); */
1127 mos7840_port->icount.tx = 0;
1128 mos7840_port->icount.rx = 0;
1129
1130 dbg("usb_serial serial:%p mos7840_port:%p\n usb_serial_port port:%p",
1131 serial, mos7840_port, port);
1132
1133 dbg ("%s leave", __func__);
1134
1135 return 0;
1136
1137 }
1138
1139 /*****************************************************************************
1140 * mos7840_chars_in_buffer
1141 * this function is called by the tty driver when it wants to know how many
1142 * bytes of data we currently have outstanding in the port (data that has
1143 * been written, but hasn't made it out the port yet)
1144 * If successful, we return the number of bytes left to be written in the
1145 * system,
1146 * Otherwise we return zero.
1147 *****************************************************************************/
1148
1149 static int mos7840_chars_in_buffer(struct tty_struct *tty)
1150 {
1151 struct usb_serial_port *port = tty->driver_data;
1152 int i;
1153 int chars = 0;
1154 unsigned long flags;
1155 struct moschip_port *mos7840_port;
1156
1157 dbg("%s", " mos7840_chars_in_buffer:entering ...........");
1158
1159 if (mos7840_port_paranoia_check(port, __func__)) {
1160 dbg("%s", "Invalid port");
1161 return 0;
1162 }
1163
1164 mos7840_port = mos7840_get_port_private(port);
1165 if (mos7840_port == NULL) {
1166 dbg("%s", "mos7840_break:leaving ...........");
1167 return 0;
1168 }
1169
1170 spin_lock_irqsave(&mos7840_port->pool_lock, flags);
1171 for (i = 0; i < NUM_URBS; ++i)
1172 if (mos7840_port->busy[i])
1173 chars += URB_TRANSFER_BUFFER_SIZE;
1174 spin_unlock_irqrestore(&mos7840_port->pool_lock, flags);
1175 dbg("%s - returns %d", __func__, chars);
1176 return chars;
1177
1178 }
1179
1180 /*****************************************************************************
1181 * mos7840_close
1182 * this function is called by the tty driver when a port is closed
1183 *****************************************************************************/
1184
1185 static void mos7840_close(struct usb_serial_port *port)
1186 {
1187 struct usb_serial *serial;
1188 struct moschip_port *mos7840_port;
1189 struct moschip_port *port0;
1190 int j;
1191 __u16 Data;
1192
1193 dbg("%s", "mos7840_close:entering...");
1194
1195 if (mos7840_port_paranoia_check(port, __func__)) {
1196 dbg("%s", "Port Paranoia failed");
1197 return;
1198 }
1199
1200 serial = mos7840_get_usb_serial(port, __func__);
1201 if (!serial) {
1202 dbg("%s", "Serial Paranoia failed");
1203 return;
1204 }
1205
1206 mos7840_port = mos7840_get_port_private(port);
1207 port0 = mos7840_get_port_private(serial->port[0]);
1208
1209 if (mos7840_port == NULL || port0 == NULL)
1210 return;
1211
1212 for (j = 0; j < NUM_URBS; ++j)
1213 usb_kill_urb(mos7840_port->write_urb_pool[j]);
1214
1215 /* Freeing Write URBs */
1216 for (j = 0; j < NUM_URBS; ++j) {
1217 if (mos7840_port->write_urb_pool[j]) {
1218 if (mos7840_port->write_urb_pool[j]->transfer_buffer)
1219 kfree(mos7840_port->write_urb_pool[j]->
1220 transfer_buffer);
1221
1222 usb_free_urb(mos7840_port->write_urb_pool[j]);
1223 }
1224 }
1225
1226 /* While closing port, shutdown all bulk read, write *
1227 * and interrupt read if they exists */
1228 if (serial->dev) {
1229 if (mos7840_port->write_urb) {
1230 dbg("%s", "Shutdown bulk write");
1231 usb_kill_urb(mos7840_port->write_urb);
1232 }
1233 if (mos7840_port->read_urb) {
1234 dbg("%s", "Shutdown bulk read");
1235 usb_kill_urb(mos7840_port->read_urb);
1236 mos7840_port->read_urb_busy = false;
1237 }
1238 if ((&mos7840_port->control_urb)) {
1239 dbg("%s", "Shutdown control read");
1240 /*/ usb_kill_urb (mos7840_port->control_urb); */
1241 }
1242 }
1243 /* if(mos7840_port->ctrl_buf != NULL) */
1244 /* kfree(mos7840_port->ctrl_buf); */
1245 port0->open_ports--;
1246 dbg("mos7840_num_open_ports in close%d:in port%d",
1247 port0->open_ports, port->number);
1248 if (port0->open_ports == 0) {
1249 if (serial->port[0]->interrupt_in_urb) {
1250 dbg("%s", "Shutdown interrupt_in_urb");
1251 usb_kill_urb(serial->port[0]->interrupt_in_urb);
1252 }
1253 }
1254
1255 if (mos7840_port->write_urb) {
1256 /* if this urb had a transfer buffer already (old tx) free it */
1257 if (mos7840_port->write_urb->transfer_buffer != NULL)
1258 kfree(mos7840_port->write_urb->transfer_buffer);
1259 usb_free_urb(mos7840_port->write_urb);
1260 }
1261
1262 Data = 0x0;
1263 mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER, Data);
1264
1265 Data = 0x00;
1266 mos7840_set_uart_reg(port, INTERRUPT_ENABLE_REGISTER, Data);
1267
1268 mos7840_port->open = 0;
1269
1270 dbg("%s", "Leaving ............");
1271 }
1272
1273 /************************************************************************
1274 *
1275 * mos7840_block_until_chase_response
1276 *
1277 * This function will block the close until one of the following:
1278 * 1. Response to our Chase comes from mos7840
1279 * 2. A timeout of 10 seconds without activity has expired
1280 * (1K of mos7840 data @ 2400 baud ==> 4 sec to empty)
1281 *
1282 ************************************************************************/
1283
1284 static void mos7840_block_until_chase_response(struct tty_struct *tty,
1285 struct moschip_port *mos7840_port)
1286 {
1287 int timeout = 1 * HZ;
1288 int wait = 10;
1289 int count;
1290
1291 while (1) {
1292 count = mos7840_chars_in_buffer(tty);
1293
1294 /* Check for Buffer status */
1295 if (count <= 0)
1296 return;
1297
1298 /* Block the thread for a while */
1299 interruptible_sleep_on_timeout(&mos7840_port->wait_chase,
1300 timeout);
1301 /* No activity.. count down section */
1302 wait--;
1303 if (wait == 0) {
1304 dbg("%s - TIMEOUT", __func__);
1305 return;
1306 } else {
1307 /* Reset timeout value back to seconds */
1308 wait = 10;
1309 }
1310 }
1311
1312 }
1313
1314 /*****************************************************************************
1315 * mos7840_break
1316 * this function sends a break to the port
1317 *****************************************************************************/
1318 static void mos7840_break(struct tty_struct *tty, int break_state)
1319 {
1320 struct usb_serial_port *port = tty->driver_data;
1321 unsigned char data;
1322 struct usb_serial *serial;
1323 struct moschip_port *mos7840_port;
1324
1325 dbg("%s", "Entering ...........");
1326 dbg("mos7840_break: Start");
1327
1328 if (mos7840_port_paranoia_check(port, __func__)) {
1329 dbg("%s", "Port Paranoia failed");
1330 return;
1331 }
1332
1333 serial = mos7840_get_usb_serial(port, __func__);
1334 if (!serial) {
1335 dbg("%s", "Serial Paranoia failed");
1336 return;
1337 }
1338
1339 mos7840_port = mos7840_get_port_private(port);
1340
1341 if (mos7840_port == NULL)
1342 return;
1343
1344 if (serial->dev)
1345 /* flush and block until tx is empty */
1346 mos7840_block_until_chase_response(tty, mos7840_port);
1347
1348 if (break_state == -1)
1349 data = mos7840_port->shadowLCR | LCR_SET_BREAK;
1350 else
1351 data = mos7840_port->shadowLCR & ~LCR_SET_BREAK;
1352
1353 /* FIXME: no locking on shadowLCR anywhere in driver */
1354 mos7840_port->shadowLCR = data;
1355 dbg("mcs7840_break mos7840_port->shadowLCR is %x",
1356 mos7840_port->shadowLCR);
1357 mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER,
1358 mos7840_port->shadowLCR);
1359
1360 return;
1361 }
1362
1363 /*****************************************************************************
1364 * mos7840_write_room
1365 * this function is called by the tty driver when it wants to know how many
1366 * bytes of data we can accept for a specific port.
1367 * If successful, we return the amount of room that we have for this port
1368 * Otherwise we return a negative error number.
1369 *****************************************************************************/
1370
1371 static int mos7840_write_room(struct tty_struct *tty)
1372 {
1373 struct usb_serial_port *port = tty->driver_data;
1374 int i;
1375 int room = 0;
1376 unsigned long flags;
1377 struct moschip_port *mos7840_port;
1378
1379 dbg("%s", " mos7840_write_room:entering ...........");
1380
1381 if (mos7840_port_paranoia_check(port, __func__)) {
1382 dbg("%s", "Invalid port");
1383 dbg("%s", " mos7840_write_room:leaving ...........");
1384 return -1;
1385 }
1386
1387 mos7840_port = mos7840_get_port_private(port);
1388 if (mos7840_port == NULL) {
1389 dbg("%s", "mos7840_break:leaving ...........");
1390 return -1;
1391 }
1392
1393 spin_lock_irqsave(&mos7840_port->pool_lock, flags);
1394 for (i = 0; i < NUM_URBS; ++i) {
1395 if (!mos7840_port->busy[i])
1396 room += URB_TRANSFER_BUFFER_SIZE;
1397 }
1398 spin_unlock_irqrestore(&mos7840_port->pool_lock, flags);
1399
1400 room = (room == 0) ? 0 : room - URB_TRANSFER_BUFFER_SIZE + 1;
1401 dbg("%s - returns %d", __func__, room);
1402 return room;
1403
1404 }
1405
1406 /*****************************************************************************
1407 * mos7840_write
1408 * this function is called by the tty driver when data should be written to
1409 * the port.
1410 * If successful, we return the number of bytes written, otherwise we
1411 * return a negative error number.
1412 *****************************************************************************/
1413
1414 static int mos7840_write(struct tty_struct *tty, struct usb_serial_port *port,
1415 const unsigned char *data, int count)
1416 {
1417 int status;
1418 int i;
1419 int bytes_sent = 0;
1420 int transfer_size;
1421 unsigned long flags;
1422
1423 struct moschip_port *mos7840_port;
1424 struct usb_serial *serial;
1425 struct urb *urb;
1426 /* __u16 Data; */
1427 const unsigned char *current_position = data;
1428 unsigned char *data1;
1429 dbg("%s", "entering ...........");
1430 /* dbg("mos7840_write: mos7840_port->shadowLCR is %x",
1431 mos7840_port->shadowLCR); */
1432
1433 #ifdef NOTMOS7840
1434 Data = 0x00;
1435 status = mos7840_get_uart_reg(port, LINE_CONTROL_REGISTER, &Data);
1436 mos7840_port->shadowLCR = Data;
1437 dbg("mos7840_write: LINE_CONTROL_REGISTER is %x", Data);
1438 dbg("mos7840_write: mos7840_port->shadowLCR is %x",
1439 mos7840_port->shadowLCR);
1440
1441 /* Data = 0x03; */
1442 /* status = mos7840_set_uart_reg(port,LINE_CONTROL_REGISTER,Data); */
1443 /* mos7840_port->shadowLCR=Data;//Need to add later */
1444
1445 Data |= SERIAL_LCR_DLAB; /* data latch enable in LCR 0x80 */
1446 status = mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data);
1447
1448 /* Data = 0x0c; */
1449 /* status = mos7840_set_uart_reg(port,DIVISOR_LATCH_LSB,Data); */
1450 Data = 0x00;
1451 status = mos7840_get_uart_reg(port, DIVISOR_LATCH_LSB, &Data);
1452 dbg("mos7840_write:DLL value is %x", Data);
1453
1454 Data = 0x0;
1455 status = mos7840_get_uart_reg(port, DIVISOR_LATCH_MSB, &Data);
1456 dbg("mos7840_write:DLM value is %x", Data);
1457
1458 Data = Data & ~SERIAL_LCR_DLAB;
1459 dbg("mos7840_write: mos7840_port->shadowLCR is %x",
1460 mos7840_port->shadowLCR);
1461 status = mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data);
1462 #endif
1463
1464 if (mos7840_port_paranoia_check(port, __func__)) {
1465 dbg("%s", "Port Paranoia failed");
1466 return -1;
1467 }
1468
1469 serial = port->serial;
1470 if (mos7840_serial_paranoia_check(serial, __func__)) {
1471 dbg("%s", "Serial Paranoia failed");
1472 return -1;
1473 }
1474
1475 mos7840_port = mos7840_get_port_private(port);
1476 if (mos7840_port == NULL) {
1477 dbg("%s", "mos7840_port is NULL");
1478 return -1;
1479 }
1480
1481 /* try to find a free urb in the list */
1482 urb = NULL;
1483
1484 spin_lock_irqsave(&mos7840_port->pool_lock, flags);
1485 for (i = 0; i < NUM_URBS; ++i) {
1486 if (!mos7840_port->busy[i]) {
1487 mos7840_port->busy[i] = 1;
1488 urb = mos7840_port->write_urb_pool[i];
1489 dbg("URB:%d", i);
1490 break;
1491 }
1492 }
1493 spin_unlock_irqrestore(&mos7840_port->pool_lock, flags);
1494
1495 if (urb == NULL) {
1496 dbg("%s - no more free urbs", __func__);
1497 goto exit;
1498 }
1499
1500 if (urb->transfer_buffer == NULL) {
1501 urb->transfer_buffer =
1502 kmalloc(URB_TRANSFER_BUFFER_SIZE, GFP_KERNEL);
1503
1504 if (urb->transfer_buffer == NULL) {
1505 dev_err(&port->dev, "%s no more kernel memory...\n",
1506 __func__);
1507 goto exit;
1508 }
1509 }
1510 transfer_size = min(count, URB_TRANSFER_BUFFER_SIZE);
1511
1512 memcpy(urb->transfer_buffer, current_position, transfer_size);
1513
1514 /* fill urb with data and submit */
1515 usb_fill_bulk_urb(urb,
1516 serial->dev,
1517 usb_sndbulkpipe(serial->dev,
1518 port->bulk_out_endpointAddress),
1519 urb->transfer_buffer,
1520 transfer_size,
1521 mos7840_bulk_out_data_callback, mos7840_port);
1522
1523 data1 = urb->transfer_buffer;
1524 dbg("bulkout endpoint is %d", port->bulk_out_endpointAddress);
1525
1526 /* send it down the pipe */
1527 status = usb_submit_urb(urb, GFP_ATOMIC);
1528
1529 if (status) {
1530 mos7840_port->busy[i] = 0;
1531 dev_err(&port->dev, "%s - usb_submit_urb(write bulk) failed "
1532 "with status = %d\n", __func__, status);
1533 bytes_sent = status;
1534 goto exit;
1535 }
1536 bytes_sent = transfer_size;
1537 mos7840_port->icount.tx += transfer_size;
1538 smp_wmb();
1539 dbg("mos7840_port->icount.tx is %d:", mos7840_port->icount.tx);
1540 exit:
1541 return bytes_sent;
1542
1543 }
1544
1545 /*****************************************************************************
1546 * mos7840_throttle
1547 * this function is called by the tty driver when it wants to stop the data
1548 * being read from the port.
1549 *****************************************************************************/
1550
1551 static void mos7840_throttle(struct tty_struct *tty)
1552 {
1553 struct usb_serial_port *port = tty->driver_data;
1554 struct moschip_port *mos7840_port;
1555 int status;
1556
1557 if (mos7840_port_paranoia_check(port, __func__)) {
1558 dbg("%s", "Invalid port");
1559 return;
1560 }
1561
1562 dbg("- port %d", port->number);
1563
1564 mos7840_port = mos7840_get_port_private(port);
1565
1566 if (mos7840_port == NULL)
1567 return;
1568
1569 if (!mos7840_port->open) {
1570 dbg("%s", "port not opened");
1571 return;
1572 }
1573
1574 dbg("%s", "Entering ..........");
1575
1576 /* if we are implementing XON/XOFF, send the stop character */
1577 if (I_IXOFF(tty)) {
1578 unsigned char stop_char = STOP_CHAR(tty);
1579 status = mos7840_write(tty, port, &stop_char, 1);
1580 if (status <= 0)
1581 return;
1582 }
1583 /* if we are implementing RTS/CTS, toggle that line */
1584 if (tty->termios->c_cflag & CRTSCTS) {
1585 mos7840_port->shadowMCR &= ~MCR_RTS;
1586 status = mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER,
1587 mos7840_port->shadowMCR);
1588 if (status < 0)
1589 return;
1590 }
1591
1592 return;
1593 }
1594
1595 /*****************************************************************************
1596 * mos7840_unthrottle
1597 * this function is called by the tty driver when it wants to resume
1598 * the data being read from the port (called after mos7840_throttle is
1599 * called)
1600 *****************************************************************************/
1601 static void mos7840_unthrottle(struct tty_struct *tty)
1602 {
1603 struct usb_serial_port *port = tty->driver_data;
1604 int status;
1605 struct moschip_port *mos7840_port = mos7840_get_port_private(port);
1606
1607 if (mos7840_port_paranoia_check(port, __func__)) {
1608 dbg("%s", "Invalid port");
1609 return;
1610 }
1611
1612 if (mos7840_port == NULL)
1613 return;
1614
1615 if (!mos7840_port->open) {
1616 dbg("%s - port not opened", __func__);
1617 return;
1618 }
1619
1620 dbg("%s", "Entering ..........");
1621
1622 /* if we are implementing XON/XOFF, send the start character */
1623 if (I_IXOFF(tty)) {
1624 unsigned char start_char = START_CHAR(tty);
1625 status = mos7840_write(tty, port, &start_char, 1);
1626 if (status <= 0)
1627 return;
1628 }
1629
1630 /* if we are implementing RTS/CTS, toggle that line */
1631 if (tty->termios->c_cflag & CRTSCTS) {
1632 mos7840_port->shadowMCR |= MCR_RTS;
1633 status = mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER,
1634 mos7840_port->shadowMCR);
1635 if (status < 0)
1636 return;
1637 }
1638 }
1639
1640 static int mos7840_tiocmget(struct tty_struct *tty, struct file *file)
1641 {
1642 struct usb_serial_port *port = tty->driver_data;
1643 struct moschip_port *mos7840_port;
1644 unsigned int result;
1645 __u16 msr;
1646 __u16 mcr;
1647 int status;
1648 mos7840_port = mos7840_get_port_private(port);
1649
1650 dbg("%s - port %d", __func__, port->number);
1651
1652 if (mos7840_port == NULL)
1653 return -ENODEV;
1654
1655 status = mos7840_get_uart_reg(port, MODEM_STATUS_REGISTER, &msr);
1656 status = mos7840_get_uart_reg(port, MODEM_CONTROL_REGISTER, &mcr);
1657 result = ((mcr & MCR_DTR) ? TIOCM_DTR : 0)
1658 | ((mcr & MCR_RTS) ? TIOCM_RTS : 0)
1659 | ((mcr & MCR_LOOPBACK) ? TIOCM_LOOP : 0)
1660 | ((msr & MOS7840_MSR_CTS) ? TIOCM_CTS : 0)
1661 | ((msr & MOS7840_MSR_CD) ? TIOCM_CAR : 0)
1662 | ((msr & MOS7840_MSR_RI) ? TIOCM_RI : 0)
1663 | ((msr & MOS7840_MSR_DSR) ? TIOCM_DSR : 0);
1664
1665 dbg("%s - 0x%04X", __func__, result);
1666
1667 return result;
1668 }
1669
1670 static int mos7840_tiocmset(struct tty_struct *tty, struct file *file,
1671 unsigned int set, unsigned int clear)
1672 {
1673 struct usb_serial_port *port = tty->driver_data;
1674 struct moschip_port *mos7840_port;
1675 unsigned int mcr;
1676 int status;
1677
1678 dbg("%s - port %d", __func__, port->number);
1679
1680 mos7840_port = mos7840_get_port_private(port);
1681
1682 if (mos7840_port == NULL)
1683 return -ENODEV;
1684
1685 /* FIXME: What locks the port registers ? */
1686 mcr = mos7840_port->shadowMCR;
1687 if (clear & TIOCM_RTS)
1688 mcr &= ~MCR_RTS;
1689 if (clear & TIOCM_DTR)
1690 mcr &= ~MCR_DTR;
1691 if (clear & TIOCM_LOOP)
1692 mcr &= ~MCR_LOOPBACK;
1693
1694 if (set & TIOCM_RTS)
1695 mcr |= MCR_RTS;
1696 if (set & TIOCM_DTR)
1697 mcr |= MCR_DTR;
1698 if (set & TIOCM_LOOP)
1699 mcr |= MCR_LOOPBACK;
1700
1701 mos7840_port->shadowMCR = mcr;
1702
1703 status = mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER, mcr);
1704 if (status < 0) {
1705 dbg("setting MODEM_CONTROL_REGISTER Failed");
1706 return status;
1707 }
1708
1709 return 0;
1710 }
1711
1712 /*****************************************************************************
1713 * mos7840_calc_baud_rate_divisor
1714 * this function calculates the proper baud rate divisor for the specified
1715 * baud rate.
1716 *****************************************************************************/
1717 static int mos7840_calc_baud_rate_divisor(int baudRate, int *divisor,
1718 __u16 *clk_sel_val)
1719 {
1720
1721 dbg("%s - %d", __func__, baudRate);
1722
1723 if (baudRate <= 115200) {
1724 *divisor = 115200 / baudRate;
1725 *clk_sel_val = 0x0;
1726 }
1727 if ((baudRate > 115200) && (baudRate <= 230400)) {
1728 *divisor = 230400 / baudRate;
1729 *clk_sel_val = 0x10;
1730 } else if ((baudRate > 230400) && (baudRate <= 403200)) {
1731 *divisor = 403200 / baudRate;
1732 *clk_sel_val = 0x20;
1733 } else if ((baudRate > 403200) && (baudRate <= 460800)) {
1734 *divisor = 460800 / baudRate;
1735 *clk_sel_val = 0x30;
1736 } else if ((baudRate > 460800) && (baudRate <= 806400)) {
1737 *divisor = 806400 / baudRate;
1738 *clk_sel_val = 0x40;
1739 } else if ((baudRate > 806400) && (baudRate <= 921600)) {
1740 *divisor = 921600 / baudRate;
1741 *clk_sel_val = 0x50;
1742 } else if ((baudRate > 921600) && (baudRate <= 1572864)) {
1743 *divisor = 1572864 / baudRate;
1744 *clk_sel_val = 0x60;
1745 } else if ((baudRate > 1572864) && (baudRate <= 3145728)) {
1746 *divisor = 3145728 / baudRate;
1747 *clk_sel_val = 0x70;
1748 }
1749 return 0;
1750
1751 #ifdef NOTMCS7840
1752
1753 for (i = 0; i < ARRAY_SIZE(mos7840_divisor_table); i++) {
1754 if (mos7840_divisor_table[i].BaudRate == baudrate) {
1755 *divisor = mos7840_divisor_table[i].Divisor;
1756 return 0;
1757 }
1758 }
1759
1760 /* After trying for all the standard baud rates *
1761 * Try calculating the divisor for this baud rate */
1762
1763 if (baudrate > 75 && baudrate < 230400) {
1764 /* get the divisor */
1765 custom = (__u16) (230400L / baudrate);
1766
1767 /* Check for round off */
1768 round1 = (__u16) (2304000L / baudrate);
1769 round = (__u16) (round1 - (custom * 10));
1770 if (round > 4)
1771 custom++;
1772 *divisor = custom;
1773
1774 dbg(" Baud %d = %d", baudrate, custom);
1775 return 0;
1776 }
1777
1778 dbg("%s", " Baud calculation Failed...");
1779 return -1;
1780 #endif
1781 }
1782
1783 /*****************************************************************************
1784 * mos7840_send_cmd_write_baud_rate
1785 * this function sends the proper command to change the baud rate of the
1786 * specified port.
1787 *****************************************************************************/
1788
1789 static int mos7840_send_cmd_write_baud_rate(struct moschip_port *mos7840_port,
1790 int baudRate)
1791 {
1792 int divisor = 0;
1793 int status;
1794 __u16 Data;
1795 unsigned char number;
1796 __u16 clk_sel_val;
1797 struct usb_serial_port *port;
1798
1799 if (mos7840_port == NULL)
1800 return -1;
1801
1802 port = (struct usb_serial_port *)mos7840_port->port;
1803 if (mos7840_port_paranoia_check(port, __func__)) {
1804 dbg("%s", "Invalid port");
1805 return -1;
1806 }
1807
1808 if (mos7840_serial_paranoia_check(port->serial, __func__)) {
1809 dbg("%s", "Invalid Serial");
1810 return -1;
1811 }
1812
1813 dbg("%s", "Entering ..........");
1814
1815 number = mos7840_port->port->number - mos7840_port->port->serial->minor;
1816
1817 dbg("%s - port = %d, baud = %d", __func__,
1818 mos7840_port->port->number, baudRate);
1819 /* reset clk_uart_sel in spregOffset */
1820 if (baudRate > 115200) {
1821 #ifdef HW_flow_control
1822 /* NOTE: need to see the pther register to modify */
1823 /* setting h/w flow control bit to 1 */
1824 Data = 0x2b;
1825 mos7840_port->shadowMCR = Data;
1826 status = mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER,
1827 Data);
1828 if (status < 0) {
1829 dbg("Writing spreg failed in set_serial_baud");
1830 return -1;
1831 }
1832 #endif
1833
1834 } else {
1835 #ifdef HW_flow_control
1836 / *setting h/w flow control bit to 0 */
1837 Data = 0xb;
1838 mos7840_port->shadowMCR = Data;
1839 status = mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER,
1840 Data);
1841 if (status < 0) {
1842 dbg("Writing spreg failed in set_serial_baud");
1843 return -1;
1844 }
1845 #endif
1846
1847 }
1848
1849 if (1) { /* baudRate <= 115200) */
1850 clk_sel_val = 0x0;
1851 Data = 0x0;
1852 status = mos7840_calc_baud_rate_divisor(baudRate, &divisor,
1853 &clk_sel_val);
1854 status = mos7840_get_reg_sync(port, mos7840_port->SpRegOffset,
1855 &Data);
1856 if (status < 0) {
1857 dbg("reading spreg failed in set_serial_baud");
1858 return -1;
1859 }
1860 Data = (Data & 0x8f) | clk_sel_val;
1861 status = mos7840_set_reg_sync(port, mos7840_port->SpRegOffset,
1862 Data);
1863 if (status < 0) {
1864 dbg("Writing spreg failed in set_serial_baud");
1865 return -1;
1866 }
1867 /* Calculate the Divisor */
1868
1869 if (status) {
1870 dev_err(&port->dev, "%s - bad baud rate\n", __func__);
1871 return status;
1872 }
1873 /* Enable access to divisor latch */
1874 Data = mos7840_port->shadowLCR | SERIAL_LCR_DLAB;
1875 mos7840_port->shadowLCR = Data;
1876 mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data);
1877
1878 /* Write the divisor */
1879 Data = (unsigned char)(divisor & 0xff);
1880 dbg("set_serial_baud Value to write DLL is %x", Data);
1881 mos7840_set_uart_reg(port, DIVISOR_LATCH_LSB, Data);
1882
1883 Data = (unsigned char)((divisor & 0xff00) >> 8);
1884 dbg("set_serial_baud Value to write DLM is %x", Data);
1885 mos7840_set_uart_reg(port, DIVISOR_LATCH_MSB, Data);
1886
1887 /* Disable access to divisor latch */
1888 Data = mos7840_port->shadowLCR & ~SERIAL_LCR_DLAB;
1889 mos7840_port->shadowLCR = Data;
1890 mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data);
1891
1892 }
1893 return status;
1894 }
1895
1896 /*****************************************************************************
1897 * mos7840_change_port_settings
1898 * This routine is called to set the UART on the device to match
1899 * the specified new settings.
1900 *****************************************************************************/
1901
1902 static void mos7840_change_port_settings(struct tty_struct *tty,
1903 struct moschip_port *mos7840_port, struct ktermios *old_termios)
1904 {
1905 int baud;
1906 unsigned cflag;
1907 unsigned iflag;
1908 __u8 lData;
1909 __u8 lParity;
1910 __u8 lStop;
1911 int status;
1912 __u16 Data;
1913 struct usb_serial_port *port;
1914 struct usb_serial *serial;
1915
1916 if (mos7840_port == NULL)
1917 return;
1918
1919 port = (struct usb_serial_port *)mos7840_port->port;
1920
1921 if (mos7840_port_paranoia_check(port, __func__)) {
1922 dbg("%s", "Invalid port");
1923 return;
1924 }
1925
1926 if (mos7840_serial_paranoia_check(port->serial, __func__)) {
1927 dbg("%s", "Invalid Serial");
1928 return;
1929 }
1930
1931 serial = port->serial;
1932
1933 dbg("%s - port %d", __func__, mos7840_port->port->number);
1934
1935 if (!mos7840_port->open) {
1936 dbg("%s - port not opened", __func__);
1937 return;
1938 }
1939
1940 dbg("%s", "Entering ..........");
1941
1942 lData = LCR_BITS_8;
1943 lStop = LCR_STOP_1;
1944 lParity = LCR_PAR_NONE;
1945
1946 cflag = tty->termios->c_cflag;
1947 iflag = tty->termios->c_iflag;
1948
1949 /* Change the number of bits */
1950 if (cflag & CSIZE) {
1951 switch (cflag & CSIZE) {
1952 case CS5:
1953 lData = LCR_BITS_5;
1954 break;
1955
1956 case CS6:
1957 lData = LCR_BITS_6;
1958 break;
1959
1960 case CS7:
1961 lData = LCR_BITS_7;
1962 break;
1963 default:
1964 case CS8:
1965 lData = LCR_BITS_8;
1966 break;
1967 }
1968 }
1969 /* Change the Parity bit */
1970 if (cflag & PARENB) {
1971 if (cflag & PARODD) {
1972 lParity = LCR_PAR_ODD;
1973 dbg("%s - parity = odd", __func__);
1974 } else {
1975 lParity = LCR_PAR_EVEN;
1976 dbg("%s - parity = even", __func__);
1977 }
1978
1979 } else {
1980 dbg("%s - parity = none", __func__);
1981 }
1982
1983 if (cflag & CMSPAR)
1984 lParity = lParity | 0x20;
1985
1986 /* Change the Stop bit */
1987 if (cflag & CSTOPB) {
1988 lStop = LCR_STOP_2;
1989 dbg("%s - stop bits = 2", __func__);
1990 } else {
1991 lStop = LCR_STOP_1;
1992 dbg("%s - stop bits = 1", __func__);
1993 }
1994
1995 /* Update the LCR with the correct value */
1996 mos7840_port->shadowLCR &=
1997 ~(LCR_BITS_MASK | LCR_STOP_MASK | LCR_PAR_MASK);
1998 mos7840_port->shadowLCR |= (lData | lParity | lStop);
1999
2000 dbg("mos7840_change_port_settings mos7840_port->shadowLCR is %x",
2001 mos7840_port->shadowLCR);
2002 /* Disable Interrupts */
2003 Data = 0x00;
2004 mos7840_set_uart_reg(port, INTERRUPT_ENABLE_REGISTER, Data);
2005
2006 Data = 0x00;
2007 mos7840_set_uart_reg(port, FIFO_CONTROL_REGISTER, Data);
2008
2009 Data = 0xcf;
2010 mos7840_set_uart_reg(port, FIFO_CONTROL_REGISTER, Data);
2011
2012 /* Send the updated LCR value to the mos7840 */
2013 Data = mos7840_port->shadowLCR;
2014
2015 mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data);
2016
2017 Data = 0x00b;
2018 mos7840_port->shadowMCR = Data;
2019 mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER, Data);
2020 Data = 0x00b;
2021 mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER, Data);
2022
2023 /* set up the MCR register and send it to the mos7840 */
2024
2025 mos7840_port->shadowMCR = MCR_MASTER_IE;
2026 if (cflag & CBAUD)
2027 mos7840_port->shadowMCR |= (MCR_DTR | MCR_RTS);
2028
2029 if (cflag & CRTSCTS)
2030 mos7840_port->shadowMCR |= (MCR_XON_ANY);
2031 else
2032 mos7840_port->shadowMCR &= ~(MCR_XON_ANY);
2033
2034 Data = mos7840_port->shadowMCR;
2035 mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER, Data);
2036
2037 /* Determine divisor based on baud rate */
2038 baud = tty_get_baud_rate(tty);
2039
2040 if (!baud) {
2041 /* pick a default, any default... */
2042 dbg("%s", "Picked default baud...");
2043 baud = 9600;
2044 }
2045
2046 dbg("%s - baud rate = %d", __func__, baud);
2047 status = mos7840_send_cmd_write_baud_rate(mos7840_port, baud);
2048
2049 /* Enable Interrupts */
2050 Data = 0x0c;
2051 mos7840_set_uart_reg(port, INTERRUPT_ENABLE_REGISTER, Data);
2052
2053 if (mos7840_port->read_urb_busy == false) {
2054 mos7840_port->read_urb->dev = serial->dev;
2055 mos7840_port->read_urb_busy = true;
2056 status = usb_submit_urb(mos7840_port->read_urb, GFP_ATOMIC);
2057 if (status) {
2058 dbg("usb_submit_urb(read bulk) failed, status = %d",
2059 status);
2060 mos7840_port->read_urb_busy = false;
2061 }
2062 }
2063 wake_up(&mos7840_port->delta_msr_wait);
2064 mos7840_port->delta_msr_cond = 1;
2065 dbg("mos7840_change_port_settings mos7840_port->shadowLCR is End %x",
2066 mos7840_port->shadowLCR);
2067
2068 return;
2069 }
2070
2071 /*****************************************************************************
2072 * mos7840_set_termios
2073 * this function is called by the tty driver when it wants to change
2074 * the termios structure
2075 *****************************************************************************/
2076
2077 static void mos7840_set_termios(struct tty_struct *tty,
2078 struct usb_serial_port *port,
2079 struct ktermios *old_termios)
2080 {
2081 int status;
2082 unsigned int cflag;
2083 struct usb_serial *serial;
2084 struct moschip_port *mos7840_port;
2085 dbg("mos7840_set_termios: START");
2086 if (mos7840_port_paranoia_check(port, __func__)) {
2087 dbg("%s", "Invalid port");
2088 return;
2089 }
2090
2091 serial = port->serial;
2092
2093 if (mos7840_serial_paranoia_check(serial, __func__)) {
2094 dbg("%s", "Invalid Serial");
2095 return;
2096 }
2097
2098 mos7840_port = mos7840_get_port_private(port);
2099
2100 if (mos7840_port == NULL)
2101 return;
2102
2103 if (!mos7840_port->open) {
2104 dbg("%s - port not opened", __func__);
2105 return;
2106 }
2107
2108 dbg("%s", "setting termios - ");
2109
2110 cflag = tty->termios->c_cflag;
2111
2112 dbg("%s - clfag %08x iflag %08x", __func__,
2113 tty->termios->c_cflag, RELEVANT_IFLAG(tty->termios->c_iflag));
2114 dbg("%s - old clfag %08x old iflag %08x", __func__,
2115 old_termios->c_cflag, RELEVANT_IFLAG(old_termios->c_iflag));
2116 dbg("%s - port %d", __func__, port->number);
2117
2118 /* change the port settings to the new ones specified */
2119
2120 mos7840_change_port_settings(tty, mos7840_port, old_termios);
2121
2122 if (!mos7840_port->read_urb) {
2123 dbg("%s", "URB KILLED !!!!!");
2124 return;
2125 }
2126
2127 if (mos7840_port->read_urb_busy == false) {
2128 mos7840_port->read_urb->dev = serial->dev;
2129 mos7840_port->read_urb_busy = true;
2130 status = usb_submit_urb(mos7840_port->read_urb, GFP_ATOMIC);
2131 if (status) {
2132 dbg("usb_submit_urb(read bulk) failed, status = %d",
2133 status);
2134 mos7840_port->read_urb_busy = false;
2135 }
2136 }
2137 return;
2138 }
2139
2140 /*****************************************************************************
2141 * mos7840_get_lsr_info - get line status register info
2142 *
2143 * Purpose: Let user call ioctl() to get info when the UART physically
2144 * is emptied. On bus types like RS485, the transmitter must
2145 * release the bus after transmitting. This must be done when
2146 * the transmit shift register is empty, not be done when the
2147 * transmit holding register is empty. This functionality
2148 * allows an RS485 driver to be written in user space.
2149 *****************************************************************************/
2150
2151 static int mos7840_get_lsr_info(struct tty_struct *tty,
2152 unsigned int __user *value)
2153 {
2154 int count;
2155 unsigned int result = 0;
2156
2157 count = mos7840_chars_in_buffer(tty);
2158 if (count == 0) {
2159 dbg("%s -- Empty", __func__);
2160 result = TIOCSER_TEMT;
2161 }
2162
2163 if (copy_to_user(value, &result, sizeof(int)))
2164 return -EFAULT;
2165 return 0;
2166 }
2167
2168 /*****************************************************************************
2169 * mos7840_get_serial_info
2170 * function to get information about serial port
2171 *****************************************************************************/
2172
2173 static int mos7840_get_serial_info(struct moschip_port *mos7840_port,
2174 struct serial_struct __user *retinfo)
2175 {
2176 struct serial_struct tmp;
2177
2178 if (mos7840_port == NULL)
2179 return -1;
2180
2181 if (!retinfo)
2182 return -EFAULT;
2183
2184 memset(&tmp, 0, sizeof(tmp));
2185
2186 tmp.type = PORT_16550A;
2187 tmp.line = mos7840_port->port->serial->minor;
2188 tmp.port = mos7840_port->port->number;
2189 tmp.irq = 0;
2190 tmp.flags = ASYNC_SKIP_TEST | ASYNC_AUTO_IRQ;
2191 tmp.xmit_fifo_size = NUM_URBS * URB_TRANSFER_BUFFER_SIZE;
2192 tmp.baud_base = 9600;
2193 tmp.close_delay = 5 * HZ;
2194 tmp.closing_wait = 30 * HZ;
2195
2196 if (copy_to_user(retinfo, &tmp, sizeof(*retinfo)))
2197 return -EFAULT;
2198 return 0;
2199 }
2200
2201 /*****************************************************************************
2202 * SerialIoctl
2203 * this function handles any ioctl calls to the driver
2204 *****************************************************************************/
2205
2206 static int mos7840_ioctl(struct tty_struct *tty, struct file *file,
2207 unsigned int cmd, unsigned long arg)
2208 {
2209 struct usb_serial_port *port = tty->driver_data;
2210 void __user *argp = (void __user *)arg;
2211 struct moschip_port *mos7840_port;
2212
2213 struct async_icount cnow;
2214 struct async_icount cprev;
2215 struct serial_icounter_struct icount;
2216
2217 if (mos7840_port_paranoia_check(port, __func__)) {
2218 dbg("%s", "Invalid port");
2219 return -1;
2220 }
2221
2222 mos7840_port = mos7840_get_port_private(port);
2223
2224 if (mos7840_port == NULL)
2225 return -1;
2226
2227 dbg("%s - port %d, cmd = 0x%x", __func__, port->number, cmd);
2228
2229 switch (cmd) {
2230 /* return number of bytes available */
2231
2232 case TIOCSERGETLSR:
2233 dbg("%s (%d) TIOCSERGETLSR", __func__, port->number);
2234 return mos7840_get_lsr_info(tty, argp);
2235 return 0;
2236
2237 case TIOCGSERIAL:
2238 dbg("%s (%d) TIOCGSERIAL", __func__, port->number);
2239 return mos7840_get_serial_info(mos7840_port, argp);
2240
2241 case TIOCSSERIAL:
2242 dbg("%s (%d) TIOCSSERIAL", __func__, port->number);
2243 break;
2244
2245 case TIOCMIWAIT:
2246 dbg("%s (%d) TIOCMIWAIT", __func__, port->number);
2247 cprev = mos7840_port->icount;
2248 while (1) {
2249 /* interruptible_sleep_on(&mos7840_port->delta_msr_wait); */
2250 mos7840_port->delta_msr_cond = 0;
2251 wait_event_interruptible(mos7840_port->delta_msr_wait,
2252 (mos7840_port->
2253 delta_msr_cond == 1));
2254
2255 /* see if a signal did it */
2256 if (signal_pending(current))
2257 return -ERESTARTSYS;
2258 cnow = mos7840_port->icount;
2259 smp_rmb();
2260 if (cnow.rng == cprev.rng && cnow.dsr == cprev.dsr &&
2261 cnow.dcd == cprev.dcd && cnow.cts == cprev.cts)
2262 return -EIO; /* no change => error */
2263 if (((arg & TIOCM_RNG) && (cnow.rng != cprev.rng)) ||
2264 ((arg & TIOCM_DSR) && (cnow.dsr != cprev.dsr)) ||
2265 ((arg & TIOCM_CD) && (cnow.dcd != cprev.dcd)) ||
2266 ((arg & TIOCM_CTS) && (cnow.cts != cprev.cts))) {
2267 return 0;
2268 }
2269 cprev = cnow;
2270 }
2271 /* NOTREACHED */
2272 break;
2273
2274 case TIOCGICOUNT:
2275 cnow = mos7840_port->icount;
2276 smp_rmb();
2277 icount.cts = cnow.cts;
2278 icount.dsr = cnow.dsr;
2279 icount.rng = cnow.rng;
2280 icount.dcd = cnow.dcd;
2281 icount.rx = cnow.rx;
2282 icount.tx = cnow.tx;
2283 icount.frame = cnow.frame;
2284 icount.overrun = cnow.overrun;
2285 icount.parity = cnow.parity;
2286 icount.brk = cnow.brk;
2287 icount.buf_overrun = cnow.buf_overrun;
2288
2289 dbg("%s (%d) TIOCGICOUNT RX=%d, TX=%d", __func__,
2290 port->number, icount.rx, icount.tx);
2291 if (copy_to_user(argp, &icount, sizeof(icount)))
2292 return -EFAULT;
2293 return 0;
2294 default:
2295 break;
2296 }
2297 return -ENOIOCTLCMD;
2298 }
2299
2300 static int mos7840_calc_num_ports(struct usb_serial *serial)
2301 {
2302 int mos7840_num_ports = 0;
2303
2304 dbg("numberofendpoints: cur %d, alt %d",
2305 (int)serial->interface->cur_altsetting->desc.bNumEndpoints,
2306 (int)serial->interface->altsetting->desc.bNumEndpoints);
2307 if (serial->interface->cur_altsetting->desc.bNumEndpoints == 5) {
2308 mos7840_num_ports = serial->num_ports = 2;
2309 } else if (serial->interface->cur_altsetting->desc.bNumEndpoints == 9) {
2310 serial->num_bulk_in = 4;
2311 serial->num_bulk_out = 4;
2312 mos7840_num_ports = serial->num_ports = 4;
2313 }
2314 dbg ("mos7840_num_ports = %d", mos7840_num_ports);
2315 return mos7840_num_ports;
2316 }
2317
2318 /****************************************************************************
2319 * mos7840_startup
2320 ****************************************************************************/
2321
2322 static int mos7840_startup(struct usb_serial *serial)
2323 {
2324 struct moschip_port *mos7840_port;
2325 struct usb_device *dev;
2326 int i, status;
2327
2328 __u16 Data;
2329 dbg("%s", "mos7840_startup :Entering..........");
2330
2331 if (!serial) {
2332 dbg("%s", "Invalid Handler");
2333 return -1;
2334 }
2335
2336 dev = serial->dev;
2337
2338 dbg("%s", "Entering...");
2339 dbg ("mos7840_startup: serial = %p", serial);
2340
2341 /* we set up the pointers to the endpoints in the mos7840_open *
2342 * function, as the structures aren't created yet. */
2343
2344 /* set up port private structures */
2345 for (i = 0; i < serial->num_ports; ++i) {
2346 dbg ("mos7840_startup: configuring port %d............", i);
2347 mos7840_port = kzalloc(sizeof(struct moschip_port), GFP_KERNEL);
2348 if (mos7840_port == NULL) {
2349 dev_err(&dev->dev, "%s - Out of memory\n", __func__);
2350 status = -ENOMEM;
2351 i--; /* don't follow NULL pointer cleaning up */
2352 goto error;
2353 }
2354
2355 /* Initialize all port interrupt end point to port 0 int
2356 * endpoint. Our device has only one interrupt end point
2357 * common to all port */
2358
2359 mos7840_port->port = serial->port[i];
2360 mos7840_set_port_private(serial->port[i], mos7840_port);
2361 spin_lock_init(&mos7840_port->pool_lock);
2362
2363 /* minor is not initialised until later by
2364 * usb-serial.c:get_free_serial() and cannot therefore be used
2365 * to index device instances */
2366 mos7840_port->port_num = i + 1;
2367 dbg ("serial->port[i]->number = %d", serial->port[i]->number);
2368 dbg ("serial->port[i]->serial->minor = %d", serial->port[i]->serial->minor);
2369 dbg ("mos7840_port->port_num = %d", mos7840_port->port_num);
2370 dbg ("serial->minor = %d", serial->minor);
2371
2372 if (mos7840_port->port_num == 1) {
2373 mos7840_port->SpRegOffset = 0x0;
2374 mos7840_port->ControlRegOffset = 0x1;
2375 mos7840_port->DcrRegOffset = 0x4;
2376 } else if ((mos7840_port->port_num == 2)
2377 && (serial->num_ports == 4)) {
2378 mos7840_port->SpRegOffset = 0x8;
2379 mos7840_port->ControlRegOffset = 0x9;
2380 mos7840_port->DcrRegOffset = 0x16;
2381 } else if ((mos7840_port->port_num == 2)
2382 && (serial->num_ports == 2)) {
2383 mos7840_port->SpRegOffset = 0xa;
2384 mos7840_port->ControlRegOffset = 0xb;
2385 mos7840_port->DcrRegOffset = 0x19;
2386 } else if ((mos7840_port->port_num == 3)
2387 && (serial->num_ports == 4)) {
2388 mos7840_port->SpRegOffset = 0xa;
2389 mos7840_port->ControlRegOffset = 0xb;
2390 mos7840_port->DcrRegOffset = 0x19;
2391 } else if ((mos7840_port->port_num == 4)
2392 && (serial->num_ports == 4)) {
2393 mos7840_port->SpRegOffset = 0xc;
2394 mos7840_port->ControlRegOffset = 0xd;
2395 mos7840_port->DcrRegOffset = 0x1c;
2396 }
2397 mos7840_dump_serial_port(mos7840_port);
2398 mos7840_set_port_private(serial->port[i], mos7840_port);
2399
2400 /* enable rx_disable bit in control register */
2401 status = mos7840_get_reg_sync(serial->port[i],
2402 mos7840_port->ControlRegOffset, &Data);
2403 if (status < 0) {
2404 dbg("Reading ControlReg failed status-0x%x", status);
2405 break;
2406 } else
2407 dbg("ControlReg Reading success val is %x, status%d",
2408 Data, status);
2409 Data |= 0x08; /* setting driver done bit */
2410 Data |= 0x04; /* sp1_bit to have cts change reflect in
2411 modem status reg */
2412
2413 /* Data |= 0x20; //rx_disable bit */
2414 status = mos7840_set_reg_sync(serial->port[i],
2415 mos7840_port->ControlRegOffset, Data);
2416 if (status < 0) {
2417 dbg("Writing ControlReg failed(rx_disable) status-0x%x", status);
2418 break;
2419 } else
2420 dbg("ControlReg Writing success(rx_disable) status%d",
2421 status);
2422
2423 /* Write default values in DCR (i.e 0x01 in DCR0, 0x05 in DCR2
2424 and 0x24 in DCR3 */
2425 Data = 0x01;
2426 status = mos7840_set_reg_sync(serial->port[i],
2427 (__u16) (mos7840_port->DcrRegOffset + 0), Data);
2428 if (status < 0) {
2429 dbg("Writing DCR0 failed status-0x%x", status);
2430 break;
2431 } else
2432 dbg("DCR0 Writing success status%d", status);
2433
2434 Data = 0x05;
2435 status = mos7840_set_reg_sync(serial->port[i],
2436 (__u16) (mos7840_port->DcrRegOffset + 1), Data);
2437 if (status < 0) {
2438 dbg("Writing DCR1 failed status-0x%x", status);
2439 break;
2440 } else
2441 dbg("DCR1 Writing success status%d", status);
2442
2443 Data = 0x24;
2444 status = mos7840_set_reg_sync(serial->port[i],
2445 (__u16) (mos7840_port->DcrRegOffset + 2), Data);
2446 if (status < 0) {
2447 dbg("Writing DCR2 failed status-0x%x", status);
2448 break;
2449 } else
2450 dbg("DCR2 Writing success status%d", status);
2451
2452 /* write values in clkstart0x0 and clkmulti 0x20 */
2453 Data = 0x0;
2454 status = mos7840_set_reg_sync(serial->port[i],
2455 CLK_START_VALUE_REGISTER, Data);
2456 if (status < 0) {
2457 dbg("Writing CLK_START_VALUE_REGISTER failed status-0x%x", status);
2458 break;
2459 } else
2460 dbg("CLK_START_VALUE_REGISTER Writing success status%d", status);
2461
2462 Data = 0x20;
2463 status = mos7840_set_reg_sync(serial->port[i],
2464 CLK_MULTI_REGISTER, Data);
2465 if (status < 0) {
2466 dbg("Writing CLK_MULTI_REGISTER failed status-0x%x",
2467 status);
2468 goto error;
2469 } else
2470 dbg("CLK_MULTI_REGISTER Writing success status%d",
2471 status);
2472
2473 /* write value 0x0 to scratchpad register */
2474 Data = 0x00;
2475 status = mos7840_set_uart_reg(serial->port[i],
2476 SCRATCH_PAD_REGISTER, Data);
2477 if (status < 0) {
2478 dbg("Writing SCRATCH_PAD_REGISTER failed status-0x%x",
2479 status);
2480 break;
2481 } else
2482 dbg("SCRATCH_PAD_REGISTER Writing success status%d",
2483 status);
2484
2485 /* Zero Length flag register */
2486 if ((mos7840_port->port_num != 1)
2487 && (serial->num_ports == 2)) {
2488
2489 Data = 0xff;
2490 status = mos7840_set_reg_sync(serial->port[i],
2491 (__u16) (ZLP_REG1 +
2492 ((__u16)mos7840_port->port_num)), Data);
2493 dbg("ZLIP offset %x",
2494 (__u16) (ZLP_REG1 +
2495 ((__u16) mos7840_port->port_num)));
2496 if (status < 0) {
2497 dbg("Writing ZLP_REG%d failed status-0x%x",
2498 i + 2, status);
2499 break;
2500 } else
2501 dbg("ZLP_REG%d Writing success status%d",
2502 i + 2, status);
2503 } else {
2504 Data = 0xff;
2505 status = mos7840_set_reg_sync(serial->port[i],
2506 (__u16) (ZLP_REG1 +
2507 ((__u16)mos7840_port->port_num) - 0x1), Data);
2508 dbg("ZLIP offset %x",
2509 (__u16) (ZLP_REG1 +
2510 ((__u16) mos7840_port->port_num) - 0x1));
2511 if (status < 0) {
2512 dbg("Writing ZLP_REG%d failed status-0x%x",
2513 i + 1, status);
2514 break;
2515 } else
2516 dbg("ZLP_REG%d Writing success status%d",
2517 i + 1, status);
2518
2519 }
2520 mos7840_port->control_urb = usb_alloc_urb(0, GFP_KERNEL);
2521 mos7840_port->ctrl_buf = kmalloc(16, GFP_KERNEL);
2522 mos7840_port->dr = kmalloc(sizeof(struct usb_ctrlrequest),
2523 GFP_KERNEL);
2524 if (!mos7840_port->control_urb || !mos7840_port->ctrl_buf ||
2525 !mos7840_port->dr) {
2526 status = -ENOMEM;
2527 goto error;
2528 }
2529 }
2530 dbg ("mos7840_startup: all ports configured...........");
2531
2532 /* Zero Length flag enable */
2533 Data = 0x0f;
2534 status = mos7840_set_reg_sync(serial->port[0], ZLP_REG5, Data);
2535 if (status < 0) {
2536 dbg("Writing ZLP_REG5 failed status-0x%x", status);
2537 goto error;
2538 } else
2539 dbg("ZLP_REG5 Writing success status%d", status);
2540
2541 /* setting configuration feature to one */
2542 usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0),
2543 (__u8) 0x03, 0x00, 0x01, 0x00, NULL, 0x00, 5 * HZ);
2544 return 0;
2545 error:
2546 for (/* nothing */; i >= 0; i--) {
2547 mos7840_port = mos7840_get_port_private(serial->port[i]);
2548
2549 kfree(mos7840_port->dr);
2550 kfree(mos7840_port->ctrl_buf);
2551 usb_free_urb(mos7840_port->control_urb);
2552 kfree(mos7840_port);
2553 serial->port[i] = NULL;
2554 }
2555 return status;
2556 }
2557
2558 /****************************************************************************
2559 * mos7840_disconnect
2560 * This function is called whenever the device is removed from the usb bus.
2561 ****************************************************************************/
2562
2563 static void mos7840_disconnect(struct usb_serial *serial)
2564 {
2565 int i;
2566 unsigned long flags;
2567 struct moschip_port *mos7840_port;
2568 dbg("%s", " disconnect :entering..........");
2569
2570 if (!serial) {
2571 dbg("%s", "Invalid Handler");
2572 return;
2573 }
2574
2575 /* check for the ports to be closed,close the ports and disconnect */
2576
2577 /* free private structure allocated for serial port *
2578 * stop reads and writes on all ports */
2579
2580 for (i = 0; i < serial->num_ports; ++i) {
2581 mos7840_port = mos7840_get_port_private(serial->port[i]);
2582 dbg ("mos7840_port %d = %p", i, mos7840_port);
2583 if (mos7840_port) {
2584 spin_lock_irqsave(&mos7840_port->pool_lock, flags);
2585 mos7840_port->zombie = 1;
2586 spin_unlock_irqrestore(&mos7840_port->pool_lock, flags);
2587 usb_kill_urb(mos7840_port->control_urb);
2588 }
2589 }
2590
2591 dbg("%s", "Thank u :: ");
2592
2593 }
2594
2595 /****************************************************************************
2596 * mos7840_release
2597 * This function is called when the usb_serial structure is freed.
2598 ****************************************************************************/
2599
2600 static void mos7840_release(struct usb_serial *serial)
2601 {
2602 int i;
2603 struct moschip_port *mos7840_port;
2604 dbg("%s", " release :entering..........");
2605
2606 if (!serial) {
2607 dbg("%s", "Invalid Handler");
2608 return;
2609 }
2610
2611 /* check for the ports to be closed,close the ports and disconnect */
2612
2613 /* free private structure allocated for serial port *
2614 * stop reads and writes on all ports */
2615
2616 for (i = 0; i < serial->num_ports; ++i) {
2617 mos7840_port = mos7840_get_port_private(serial->port[i]);
2618 dbg("mos7840_port %d = %p", i, mos7840_port);
2619 if (mos7840_port) {
2620 kfree(mos7840_port->ctrl_buf);
2621 kfree(mos7840_port->dr);
2622 kfree(mos7840_port);
2623 }
2624 }
2625
2626 dbg("%s", "Thank u :: ");
2627
2628 }
2629
2630 static struct usb_driver io_driver = {
2631 .name = "mos7840",
2632 .probe = usb_serial_probe,
2633 .disconnect = usb_serial_disconnect,
2634 .id_table = moschip_id_table_combined,
2635 .no_dynamic_id = 1,
2636 };
2637
2638 static struct usb_serial_driver moschip7840_4port_device = {
2639 .driver = {
2640 .owner = THIS_MODULE,
2641 .name = "mos7840",
2642 },
2643 .description = DRIVER_DESC,
2644 .usb_driver = &io_driver,
2645 .id_table = moschip_port_id_table,
2646 .num_ports = 4,
2647 .open = mos7840_open,
2648 .close = mos7840_close,
2649 .write = mos7840_write,
2650 .write_room = mos7840_write_room,
2651 .chars_in_buffer = mos7840_chars_in_buffer,
2652 .throttle = mos7840_throttle,
2653 .unthrottle = mos7840_unthrottle,
2654 .calc_num_ports = mos7840_calc_num_ports,
2655 #ifdef MCSSerialProbe
2656 .probe = mos7840_serial_probe,
2657 #endif
2658 .ioctl = mos7840_ioctl,
2659 .set_termios = mos7840_set_termios,
2660 .break_ctl = mos7840_break,
2661 .tiocmget = mos7840_tiocmget,
2662 .tiocmset = mos7840_tiocmset,
2663 .attach = mos7840_startup,
2664 .disconnect = mos7840_disconnect,
2665 .release = mos7840_release,
2666 .read_bulk_callback = mos7840_bulk_in_callback,
2667 .read_int_callback = mos7840_interrupt_callback,
2668 };
2669
2670 /****************************************************************************
2671 * moschip7840_init
2672 * This is called by the module subsystem, or on startup to initialize us
2673 ****************************************************************************/
2674 static int __init moschip7840_init(void)
2675 {
2676 int retval;
2677
2678 dbg("%s", " mos7840_init :entering..........");
2679
2680 /* Register with the usb serial */
2681 retval = usb_serial_register(&moschip7840_4port_device);
2682
2683 if (retval)
2684 goto failed_port_device_register;
2685
2686 dbg("%s", "Entering...");
2687 printk(KERN_INFO KBUILD_MODNAME ": " DRIVER_VERSION ":"
2688 DRIVER_DESC "\n");
2689
2690 /* Register with the usb */
2691 retval = usb_register(&io_driver);
2692 if (retval == 0) {
2693 dbg("%s", "Leaving...");
2694 return 0;
2695 }
2696 usb_serial_deregister(&moschip7840_4port_device);
2697 failed_port_device_register:
2698 return retval;
2699 }
2700
2701 /****************************************************************************
2702 * moschip7840_exit
2703 * Called when the driver is about to be unloaded.
2704 ****************************************************************************/
2705 static void __exit moschip7840_exit(void)
2706 {
2707
2708 dbg("%s", " mos7840_exit :entering..........");
2709
2710 usb_deregister(&io_driver);
2711
2712 usb_serial_deregister(&moschip7840_4port_device);
2713
2714 dbg("%s", "Entering...");
2715 }
2716
2717 module_init(moschip7840_init);
2718 module_exit(moschip7840_exit);
2719
2720 /* Module information */
2721 MODULE_DESCRIPTION(DRIVER_DESC);
2722 MODULE_LICENSE("GPL");
2723
2724 module_param(debug, bool, S_IRUGO | S_IWUSR);
2725 MODULE_PARM_DESC(debug, "Debug enabled or not");
Linux kernel - Deliverables
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