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USB: serial: Extra device/vendor ID for mos7840 driver
[linux-2.6/linux-2.6-openrd.git] / drivers / usb / serial / mos7840.c
blob2cfe2451ed97a349e8be147abd7c3dc80178a9d3
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 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 __devinitdata struct usb_device_id moschip_id_table_combined[] = {
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
287 ret = usb_control_msg(dev, usb_rcvctrlpipe(dev, 0), MCS_RDREQ,
288 MCS_RD_RTYPE, 0, reg, val, VENDOR_READ_LENGTH,
289 MOS_WDR_TIMEOUT);
290 dbg("mos7840_get_reg_sync offset is %x, return val %x", reg, *val);
291 *val = (*val) & 0x00ff;
292 return ret;
293 }
294
295 /*
296 * mos7840_set_uart_reg
297 * To set the Uart register by calling usb_fill_control_urb function by
298 * passing usb_sndctrlpipe function as parameter.
299 */
300
301 static int mos7840_set_uart_reg(struct usb_serial_port *port, __u16 reg,
302 __u16 val)
303 {
304
305 struct usb_device *dev = port->serial->dev;
306 val = val & 0x00ff;
307 /* For the UART control registers, the application number need
308 to be Or'ed */
309 if (port->serial->num_ports == 4) {
310 val |= (((__u16) port->number -
311 (__u16) (port->serial->minor)) + 1) << 8;
312 dbg("mos7840_set_uart_reg application number is %x", val);
313 } else {
314 if (((__u16) port->number - (__u16) (port->serial->minor)) == 0) {
315 val |= (((__u16) port->number -
316 (__u16) (port->serial->minor)) + 1) << 8;
317 dbg("mos7840_set_uart_reg application number is %x",
318 val);
319 } else {
320 val |=
321 (((__u16) port->number -
322 (__u16) (port->serial->minor)) + 2) << 8;
323 dbg("mos7840_set_uart_reg application number is %x",
324 val);
325 }
326 }
327 return usb_control_msg(dev, usb_sndctrlpipe(dev, 0), MCS_WRREQ,
328 MCS_WR_RTYPE, val, reg, NULL, 0,
329 MOS_WDR_TIMEOUT);
330
331 }
332
333 /*
334 * mos7840_get_uart_reg
335 * To set the Control register by calling usb_fill_control_urb function
336 * by passing usb_rcvctrlpipe function as parameter.
337 */
338 static int mos7840_get_uart_reg(struct usb_serial_port *port, __u16 reg,
339 __u16 *val)
340 {
341 struct usb_device *dev = port->serial->dev;
342 int ret = 0;
343 __u16 Wval;
344
345 /* dbg("application number is %4x",
346 (((__u16)port->number - (__u16)(port->serial->minor))+1)<<8); */
347 /* Wval is same as application number */
348 if (port->serial->num_ports == 4) {
349 Wval =
350 (((__u16) port->number - (__u16) (port->serial->minor)) +
351 1) << 8;
352 dbg("mos7840_get_uart_reg application number is %x", Wval);
353 } else {
354 if (((__u16) port->number - (__u16) (port->serial->minor)) == 0) {
355 Wval = (((__u16) port->number -
356 (__u16) (port->serial->minor)) + 1) << 8;
357 dbg("mos7840_get_uart_reg application number is %x",
358 Wval);
359 } else {
360 Wval = (((__u16) port->number -
361 (__u16) (port->serial->minor)) + 2) << 8;
362 dbg("mos7840_get_uart_reg application number is %x",
363 Wval);
364 }
365 }
366 ret = usb_control_msg(dev, usb_rcvctrlpipe(dev, 0), MCS_RDREQ,
367 MCS_RD_RTYPE, Wval, reg, val, VENDOR_READ_LENGTH,
368 MOS_WDR_TIMEOUT);
369 *val = (*val) & 0x00ff;
370 return ret;
371 }
372
373 static void mos7840_dump_serial_port(struct moschip_port *mos7840_port)
374 {
375
376 dbg("***************************************");
377 dbg("SpRegOffset is %2x", mos7840_port->SpRegOffset);
378 dbg("ControlRegOffset is %2x", mos7840_port->ControlRegOffset);
379 dbg("DCRRegOffset is %2x", mos7840_port->DcrRegOffset);
380 dbg("***************************************");
381
382 }
383
384 /************************************************************************/
385 /************************************************************************/
386 /* I N T E R F A C E F U N C T I O N S */
387 /* I N T E R F A C E F U N C T I O N S */
388 /************************************************************************/
389 /************************************************************************/
390
391 static inline void mos7840_set_port_private(struct usb_serial_port *port,
392 struct moschip_port *data)
393 {
394 usb_set_serial_port_data(port, (void *)data);
395 }
396
397 static inline struct moschip_port *mos7840_get_port_private(struct
398 usb_serial_port
399 *port)
400 {
401 return (struct moschip_port *)usb_get_serial_port_data(port);
402 }
403
404 static void mos7840_handle_new_msr(struct moschip_port *port, __u8 new_msr)
405 {
406 struct moschip_port *mos7840_port;
407 struct async_icount *icount;
408 mos7840_port = port;
409 icount = &mos7840_port->icount;
410 if (new_msr &
411 (MOS_MSR_DELTA_CTS | MOS_MSR_DELTA_DSR | MOS_MSR_DELTA_RI |
412 MOS_MSR_DELTA_CD)) {
413 icount = &mos7840_port->icount;
414
415 /* update input line counters */
416 if (new_msr & MOS_MSR_DELTA_CTS) {
417 icount->cts++;
418 smp_wmb();
419 }
420 if (new_msr & MOS_MSR_DELTA_DSR) {
421 icount->dsr++;
422 smp_wmb();
423 }
424 if (new_msr & MOS_MSR_DELTA_CD) {
425 icount->dcd++;
426 smp_wmb();
427 }
428 if (new_msr & MOS_MSR_DELTA_RI) {
429 icount->rng++;
430 smp_wmb();
431 }
432 }
433 }
434
435 static void mos7840_handle_new_lsr(struct moschip_port *port, __u8 new_lsr)
436 {
437 struct async_icount *icount;
438
439 dbg("%s - %02x", __func__, new_lsr);
440
441 if (new_lsr & SERIAL_LSR_BI) {
442 /*
443 * Parity and Framing errors only count if they
444 * occur exclusive of a break being
445 * received.
446 */
447 new_lsr &= (__u8) (SERIAL_LSR_OE | SERIAL_LSR_BI);
448 }
449
450 /* update input line counters */
451 icount = &port->icount;
452 if (new_lsr & SERIAL_LSR_BI) {
453 icount->brk++;
454 smp_wmb();
455 }
456 if (new_lsr & SERIAL_LSR_OE) {
457 icount->overrun++;
458 smp_wmb();
459 }
460 if (new_lsr & SERIAL_LSR_PE) {
461 icount->parity++;
462 smp_wmb();
463 }
464 if (new_lsr & SERIAL_LSR_FE) {
465 icount->frame++;
466 smp_wmb();
467 }
468 }
469
470 /************************************************************************/
471 /************************************************************************/
472 /* U S B C A L L B A C K F U N C T I O N S */
473 /* U S B C A L L B A C K F U N C T I O N S */
474 /************************************************************************/
475 /************************************************************************/
476
477 static void mos7840_control_callback(struct urb *urb)
478 {
479 unsigned char *data;
480 struct moschip_port *mos7840_port;
481 __u8 regval = 0x0;
482 int result = 0;
483 int status = urb->status;
484
485 mos7840_port = urb->context;
486
487 switch (status) {
488 case 0:
489 /* success */
490 break;
491 case -ECONNRESET:
492 case -ENOENT:
493 case -ESHUTDOWN:
494 /* this urb is terminated, clean up */
495 dbg("%s - urb shutting down with status: %d", __func__,
496 status);
497 return;
498 default:
499 dbg("%s - nonzero urb status received: %d", __func__,
500 status);
501 goto exit;
502 }
503
504 dbg("%s urb buffer size is %d", __func__, urb->actual_length);
505 dbg("%s mos7840_port->MsrLsr is %d port %d", __func__,
506 mos7840_port->MsrLsr, mos7840_port->port_num);
507 data = urb->transfer_buffer;
508 regval = (__u8) data[0];
509 dbg("%s data is %x", __func__, regval);
510 if (mos7840_port->MsrLsr == 0)
511 mos7840_handle_new_msr(mos7840_port, regval);
512 else if (mos7840_port->MsrLsr == 1)
513 mos7840_handle_new_lsr(mos7840_port, regval);
514
515 exit:
516 spin_lock(&mos7840_port->pool_lock);
517 if (!mos7840_port->zombie)
518 result = usb_submit_urb(mos7840_port->int_urb, GFP_ATOMIC);
519 spin_unlock(&mos7840_port->pool_lock);
520 if (result) {
521 dev_err(&urb->dev->dev,
522 "%s - Error %d submitting interrupt urb\n",
523 __func__, result);
524 }
525 }
526
527 static int mos7840_get_reg(struct moschip_port *mcs, __u16 Wval, __u16 reg,
528 __u16 *val)
529 {
530 struct usb_device *dev = mcs->port->serial->dev;
531 struct usb_ctrlrequest *dr = mcs->dr;
532 unsigned char *buffer = mcs->ctrl_buf;
533 int ret;
534
535 dr->bRequestType = MCS_RD_RTYPE;
536 dr->bRequest = MCS_RDREQ;
537 dr->wValue = cpu_to_le16(Wval); /* 0 */
538 dr->wIndex = cpu_to_le16(reg);
539 dr->wLength = cpu_to_le16(2);
540
541 usb_fill_control_urb(mcs->control_urb, dev, usb_rcvctrlpipe(dev, 0),
542 (unsigned char *)dr, buffer, 2,
543 mos7840_control_callback, mcs);
544 mcs->control_urb->transfer_buffer_length = 2;
545 ret = usb_submit_urb(mcs->control_urb, GFP_ATOMIC);
546 return ret;
547 }
548
549 /*****************************************************************************
550 * mos7840_interrupt_callback
551 * this is the callback function for when we have received data on the
552 * interrupt endpoint.
553 *****************************************************************************/
554
555 static void mos7840_interrupt_callback(struct urb *urb)
556 {
557 int result;
558 int length;
559 struct moschip_port *mos7840_port;
560 struct usb_serial *serial;
561 __u16 Data;
562 unsigned char *data;
563 __u8 sp[5], st;
564 int i, rv = 0;
565 __u16 wval, wreg = 0;
566 int status = urb->status;
567
568 dbg("%s", " : Entering");
569
570 switch (status) {
571 case 0:
572 /* success */
573 break;
574 case -ECONNRESET:
575 case -ENOENT:
576 case -ESHUTDOWN:
577 /* this urb is terminated, clean up */
578 dbg("%s - urb shutting down with status: %d", __func__,
579 status);
580 return;
581 default:
582 dbg("%s - nonzero urb status received: %d", __func__,
583 status);
584 goto exit;
585 }
586
587 length = urb->actual_length;
588 data = urb->transfer_buffer;
589
590 serial = urb->context;
591
592 /* Moschip get 5 bytes
593 * Byte 1 IIR Port 1 (port.number is 0)
594 * Byte 2 IIR Port 2 (port.number is 1)
595 * Byte 3 IIR Port 3 (port.number is 2)
596 * Byte 4 IIR Port 4 (port.number is 3)
597 * Byte 5 FIFO status for both */
598
599 if (length && length > 5) {
600 dbg("%s", "Wrong data !!!");
601 return;
602 }
603
604 sp[0] = (__u8) data[0];
605 sp[1] = (__u8) data[1];
606 sp[2] = (__u8) data[2];
607 sp[3] = (__u8) data[3];
608 st = (__u8) data[4];
609
610 for (i = 0; i < serial->num_ports; i++) {
611 mos7840_port = mos7840_get_port_private(serial->port[i]);
612 wval =
613 (((__u16) serial->port[i]->number -
614 (__u16) (serial->minor)) + 1) << 8;
615 if (mos7840_port->open) {
616 if (sp[i] & 0x01) {
617 dbg("SP%d No Interrupt !!!", i);
618 } else {
619 switch (sp[i] & 0x0f) {
620 case SERIAL_IIR_RLS:
621 dbg("Serial Port %d: Receiver status error or ", i);
622 dbg("address bit detected in 9-bit mode");
623 mos7840_port->MsrLsr = 1;
624 wreg = LINE_STATUS_REGISTER;
625 break;
626 case SERIAL_IIR_MS:
627 dbg("Serial Port %d: Modem status change", i);
628 mos7840_port->MsrLsr = 0;
629 wreg = MODEM_STATUS_REGISTER;
630 break;
631 }
632 spin_lock(&mos7840_port->pool_lock);
633 if (!mos7840_port->zombie) {
634 rv = mos7840_get_reg(mos7840_port, wval, wreg, &Data);
635 } else {
636 spin_unlock(&mos7840_port->pool_lock);
637 return;
638 }
639 spin_unlock(&mos7840_port->pool_lock);
640 }
641 }
642 }
643 if (!(rv < 0))
644 /* the completion handler for the control urb will resubmit */
645 return;
646 exit:
647 result = usb_submit_urb(urb, GFP_ATOMIC);
648 if (result) {
649 dev_err(&urb->dev->dev,
650 "%s - Error %d submitting interrupt urb\n",
651 __func__, result);
652 }
653 }
654
655 static int mos7840_port_paranoia_check(struct usb_serial_port *port,
656 const char *function)
657 {
658 if (!port) {
659 dbg("%s - port == NULL", function);
660 return -1;
661 }
662 if (!port->serial) {
663 dbg("%s - port->serial == NULL", function);
664 return -1;
665 }
666
667 return 0;
668 }
669
670 /* Inline functions to check the sanity of a pointer that is passed to us */
671 static int mos7840_serial_paranoia_check(struct usb_serial *serial,
672 const char *function)
673 {
674 if (!serial) {
675 dbg("%s - serial == NULL", function);
676 return -1;
677 }
678 if (!serial->type) {
679 dbg("%s - serial->type == NULL!", function);
680 return -1;
681 }
682
683 return 0;
684 }
685
686 static struct usb_serial *mos7840_get_usb_serial(struct usb_serial_port *port,
687 const char *function)
688 {
689 /* if no port was specified, or it fails a paranoia check */
690 if (!port ||
691 mos7840_port_paranoia_check(port, function) ||
692 mos7840_serial_paranoia_check(port->serial, function)) {
693 /* then say that we don't have a valid usb_serial thing,
694 * which will end up genrating -ENODEV return values */
695 return NULL;
696 }
697
698 return port->serial;
699 }
700
701 /*****************************************************************************
702 * mos7840_bulk_in_callback
703 * this is the callback function for when we have received data on the
704 * bulk in endpoint.
705 *****************************************************************************/
706
707 static void mos7840_bulk_in_callback(struct urb *urb)
708 {
709 int retval;
710 unsigned char *data;
711 struct usb_serial *serial;
712 struct usb_serial_port *port;
713 struct moschip_port *mos7840_port;
714 struct tty_struct *tty;
715 int status = urb->status;
716
717 mos7840_port = urb->context;
718 if (!mos7840_port) {
719 dbg("%s", "NULL mos7840_port pointer");
720 mos7840_port->read_urb_busy = false;
721 return;
722 }
723
724 if (status) {
725 dbg("nonzero read bulk status received: %d", status);
726 mos7840_port->read_urb_busy = false;
727 return;
728 }
729
730 port = (struct usb_serial_port *)mos7840_port->port;
731 if (mos7840_port_paranoia_check(port, __func__)) {
732 dbg("%s", "Port Paranoia failed");
733 mos7840_port->read_urb_busy = false;
734 return;
735 }
736
737 serial = mos7840_get_usb_serial(port, __func__);
738 if (!serial) {
739 dbg("%s", "Bad serial pointer");
740 mos7840_port->read_urb_busy = false;
741 return;
742 }
743
744 dbg("%s", "Entering... ");
745
746 data = urb->transfer_buffer;
747
748 dbg("%s", "Entering ...........");
749
750 if (urb->actual_length) {
751 tty = tty_port_tty_get(&mos7840_port->port->port);
752 if (tty) {
753 tty_buffer_request_room(tty, urb->actual_length);
754 tty_insert_flip_string(tty, data, urb->actual_length);
755 dbg(" %s ", data);
756 tty_flip_buffer_push(tty);
757 tty_kref_put(tty);
758 }
759 mos7840_port->icount.rx += urb->actual_length;
760 smp_wmb();
761 dbg("mos7840_port->icount.rx is %d:",
762 mos7840_port->icount.rx);
763 }
764
765 if (!mos7840_port->read_urb) {
766 dbg("%s", "URB KILLED !!!");
767 mos7840_port->read_urb_busy = false;
768 return;
769 }
770
771
772 mos7840_port->read_urb->dev = serial->dev;
773
774 mos7840_port->read_urb_busy = true;
775 retval = usb_submit_urb(mos7840_port->read_urb, GFP_ATOMIC);
776
777 if (retval) {
778 dbg("usb_submit_urb(read bulk) failed, retval = %d", retval);
779 mos7840_port->read_urb_busy = false;
780 }
781 }
782
783 /*****************************************************************************
784 * mos7840_bulk_out_data_callback
785 * this is the callback function for when we have finished sending
786 * serial data on the bulk out endpoint.
787 *****************************************************************************/
788
789 static void mos7840_bulk_out_data_callback(struct urb *urb)
790 {
791 struct moschip_port *mos7840_port;
792 struct tty_struct *tty;
793 int status = urb->status;
794 int i;
795
796 mos7840_port = urb->context;
797 spin_lock(&mos7840_port->pool_lock);
798 for (i = 0; i < NUM_URBS; i++) {
799 if (urb == mos7840_port->write_urb_pool[i]) {
800 mos7840_port->busy[i] = 0;
801 break;
802 }
803 }
804 spin_unlock(&mos7840_port->pool_lock);
805
806 if (status) {
807 dbg("nonzero write bulk status received:%d", status);
808 return;
809 }
810
811 if (mos7840_port_paranoia_check(mos7840_port->port, __func__)) {
812 dbg("%s", "Port Paranoia failed");
813 return;
814 }
815
816 dbg("%s", "Entering .........");
817
818 tty = tty_port_tty_get(&mos7840_port->port->port);
819 if (tty && mos7840_port->open)
820 tty_wakeup(tty);
821 tty_kref_put(tty);
822
823 }
824
825 /************************************************************************/
826 /* 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 */
827 /************************************************************************/
828 #ifdef MCSSerialProbe
829 static int mos7840_serial_probe(struct usb_serial *serial,
830 const struct usb_device_id *id)
831 {
832
833 /*need to implement the mode_reg reading and updating\
834 structures usb_serial_ device_type\
835 (i.e num_ports, num_bulkin,bulkout etc) */
836 /* Also we can update the changes attach */
837 return 1;
838 }
839 #endif
840
841 /*****************************************************************************
842 * mos7840_open
843 * this function is called by the tty driver when a port is opened
844 * If successful, we return 0
845 * Otherwise we return a negative error number.
846 *****************************************************************************/
847
848 static int mos7840_open(struct tty_struct *tty, struct usb_serial_port *port)
849 {
850 int response;
851 int j;
852 struct usb_serial *serial;
853 struct urb *urb;
854 __u16 Data;
855 int status;
856 struct moschip_port *mos7840_port;
857 struct moschip_port *port0;
858
859 dbg ("%s enter", __func__);
860
861 if (mos7840_port_paranoia_check(port, __func__)) {
862 dbg("%s", "Port Paranoia failed");
863 return -ENODEV;
864 }
865
866 serial = port->serial;
867
868 if (mos7840_serial_paranoia_check(serial, __func__)) {
869 dbg("%s", "Serial Paranoia failed");
870 return -ENODEV;
871 }
872
873 mos7840_port = mos7840_get_port_private(port);
874 port0 = mos7840_get_port_private(serial->port[0]);
875
876 if (mos7840_port == NULL || port0 == NULL)
877 return -ENODEV;
878
879 usb_clear_halt(serial->dev, port->write_urb->pipe);
880 usb_clear_halt(serial->dev, port->read_urb->pipe);
881 port0->open_ports++;
882
883 /* Initialising the write urb pool */
884 for (j = 0; j < NUM_URBS; ++j) {
885 urb = usb_alloc_urb(0, GFP_KERNEL);
886 mos7840_port->write_urb_pool[j] = urb;
887
888 if (urb == NULL) {
889 dev_err(&port->dev, "No more urbs???\n");
890 continue;
891 }
892
893 urb->transfer_buffer = kmalloc(URB_TRANSFER_BUFFER_SIZE,
894 GFP_KERNEL);
895 if (!urb->transfer_buffer) {
896 usb_free_urb(urb);
897 mos7840_port->write_urb_pool[j] = NULL;
898 dev_err(&port->dev,
899 "%s-out of memory for urb buffers.\n",
900 __func__);
901 continue;
902 }
903 }
904
905 /*****************************************************************************
906 * Initialize MCS7840 -- Write Init values to corresponding Registers
907 *
908 * Register Index
909 * 1 : IER
910 * 2 : FCR
911 * 3 : LCR
912 * 4 : MCR
913 *
914 * 0x08 : SP1/2 Control Reg
915 *****************************************************************************/
916
917 /* NEED to check the following Block */
918
919 Data = 0x0;
920 status = mos7840_get_reg_sync(port, mos7840_port->SpRegOffset, &Data);
921 if (status < 0) {
922 dbg("Reading Spreg failed");
923 return -1;
924 }
925 Data |= 0x80;
926 status = mos7840_set_reg_sync(port, mos7840_port->SpRegOffset, Data);
927 if (status < 0) {
928 dbg("writing Spreg failed");
929 return -1;
930 }
931
932 Data &= ~0x80;
933 status = mos7840_set_reg_sync(port, mos7840_port->SpRegOffset, Data);
934 if (status < 0) {
935 dbg("writing Spreg failed");
936 return -1;
937 }
938 /* End of block to be checked */
939
940 Data = 0x0;
941 status = mos7840_get_reg_sync(port, mos7840_port->ControlRegOffset,
942 &Data);
943 if (status < 0) {
944 dbg("Reading Controlreg failed");
945 return -1;
946 }
947 Data |= 0x08; /* Driver done bit */
948 Data |= 0x20; /* rx_disable */
949 status = mos7840_set_reg_sync(port,
950 mos7840_port->ControlRegOffset, Data);
951 if (status < 0) {
952 dbg("writing Controlreg failed");
953 return -1;
954 }
955 /* do register settings here */
956 /* Set all regs to the device default values. */
957 /***********************************
958 * First Disable all interrupts.
959 ***********************************/
960 Data = 0x00;
961 status = mos7840_set_uart_reg(port, INTERRUPT_ENABLE_REGISTER, Data);
962 if (status < 0) {
963 dbg("disabling interrupts failed");
964 return -1;
965 }
966 /* Set FIFO_CONTROL_REGISTER to the default value */
967 Data = 0x00;
968 status = mos7840_set_uart_reg(port, FIFO_CONTROL_REGISTER, Data);
969 if (status < 0) {
970 dbg("Writing FIFO_CONTROL_REGISTER failed");
971 return -1;
972 }
973
974 Data = 0xcf;
975 status = mos7840_set_uart_reg(port, FIFO_CONTROL_REGISTER, Data);
976 if (status < 0) {
977 dbg("Writing FIFO_CONTROL_REGISTER failed");
978 return -1;
979 }
980
981 Data = 0x03;
982 status = mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data);
983 mos7840_port->shadowLCR = Data;
984
985 Data = 0x0b;
986 status = mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER, Data);
987 mos7840_port->shadowMCR = Data;
988
989 Data = 0x00;
990 status = mos7840_get_uart_reg(port, LINE_CONTROL_REGISTER, &Data);
991 mos7840_port->shadowLCR = Data;
992
993 Data |= SERIAL_LCR_DLAB; /* data latch enable in LCR 0x80 */
994 status = mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data);
995
996 Data = 0x0c;
997 status = mos7840_set_uart_reg(port, DIVISOR_LATCH_LSB, Data);
998
999 Data = 0x0;
1000 status = mos7840_set_uart_reg(port, DIVISOR_LATCH_MSB, Data);
1001
1002 Data = 0x00;
1003 status = mos7840_get_uart_reg(port, LINE_CONTROL_REGISTER, &Data);
1004
1005 Data = Data & ~SERIAL_LCR_DLAB;
1006 status = mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data);
1007 mos7840_port->shadowLCR = Data;
1008
1009 /* clearing Bulkin and Bulkout Fifo */
1010 Data = 0x0;
1011 status = mos7840_get_reg_sync(port, mos7840_port->SpRegOffset, &Data);
1012
1013 Data = Data | 0x0c;
1014 status = mos7840_set_reg_sync(port, mos7840_port->SpRegOffset, Data);
1015
1016 Data = Data & ~0x0c;
1017 status = mos7840_set_reg_sync(port, mos7840_port->SpRegOffset, Data);
1018 /* Finally enable all interrupts */
1019 Data = 0x0c;
1020 status = mos7840_set_uart_reg(port, INTERRUPT_ENABLE_REGISTER, Data);
1021
1022 /* clearing rx_disable */
1023 Data = 0x0;
1024 status = mos7840_get_reg_sync(port, mos7840_port->ControlRegOffset,
1025 &Data);
1026 Data = Data & ~0x20;
1027 status = mos7840_set_reg_sync(port, mos7840_port->ControlRegOffset,
1028 Data);
1029
1030 /* rx_negate */
1031 Data = 0x0;
1032 status = mos7840_get_reg_sync(port, mos7840_port->ControlRegOffset,
1033 &Data);
1034 Data = Data | 0x10;
1035 status = mos7840_set_reg_sync(port, mos7840_port->ControlRegOffset,
1036 Data);
1037
1038 /* Check to see if we've set up our endpoint info yet *
1039 * (can't set it up in mos7840_startup as the structures *
1040 * were not set up at that time.) */
1041 if (port0->open_ports == 1) {
1042 if (serial->port[0]->interrupt_in_buffer == NULL) {
1043 /* set up interrupt urb */
1044 usb_fill_int_urb(serial->port[0]->interrupt_in_urb,
1045 serial->dev,
1046 usb_rcvintpipe(serial->dev,
1047 serial->port[0]->interrupt_in_endpointAddress),
1048 serial->port[0]->interrupt_in_buffer,
1049 serial->port[0]->interrupt_in_urb->
1050 transfer_buffer_length,
1051 mos7840_interrupt_callback,
1052 serial,
1053 serial->port[0]->interrupt_in_urb->interval);
1054
1055 /* start interrupt read for mos7840 *
1056 * will continue as long as mos7840 is connected */
1057
1058 response =
1059 usb_submit_urb(serial->port[0]->interrupt_in_urb,
1060 GFP_KERNEL);
1061 if (response) {
1062 dev_err(&port->dev, "%s - Error %d submitting "
1063 "interrupt urb\n", __func__, response);
1064 }
1065
1066 }
1067
1068 }
1069
1070 /* see if we've set up our endpoint info yet *
1071 * (can't set it up in mos7840_startup as the *
1072 * structures were not set up at that time.) */
1073
1074 dbg("port number is %d", port->number);
1075 dbg("serial number is %d", port->serial->minor);
1076 dbg("Bulkin endpoint is %d", port->bulk_in_endpointAddress);
1077 dbg("BulkOut endpoint is %d", port->bulk_out_endpointAddress);
1078 dbg("Interrupt endpoint is %d", port->interrupt_in_endpointAddress);
1079 dbg("port's number in the device is %d", mos7840_port->port_num);
1080 mos7840_port->read_urb = port->read_urb;
1081
1082 /* set up our bulk in urb */
1083
1084 usb_fill_bulk_urb(mos7840_port->read_urb,
1085 serial->dev,
1086 usb_rcvbulkpipe(serial->dev,
1087 port->bulk_in_endpointAddress),
1088 port->bulk_in_buffer,
1089 mos7840_port->read_urb->transfer_buffer_length,
1090 mos7840_bulk_in_callback, mos7840_port);
1091
1092 dbg("mos7840_open: bulkin endpoint is %d",
1093 port->bulk_in_endpointAddress);
1094 mos7840_port->read_urb_busy = true;
1095 response = usb_submit_urb(mos7840_port->read_urb, GFP_KERNEL);
1096 if (response) {
1097 dev_err(&port->dev, "%s - Error %d submitting control urb\n",
1098 __func__, response);
1099 mos7840_port->read_urb_busy = false;
1100 }
1101
1102 /* initialize our wait queues */
1103 init_waitqueue_head(&mos7840_port->wait_chase);
1104 init_waitqueue_head(&mos7840_port->delta_msr_wait);
1105
1106 /* initialize our icount structure */
1107 memset(&(mos7840_port->icount), 0x00, sizeof(mos7840_port->icount));
1108
1109 /* initialize our port settings */
1110 /* Must set to enable ints! */
1111 mos7840_port->shadowMCR = MCR_MASTER_IE;
1112 /* send a open port command */
1113 mos7840_port->open = 1;
1114 /* mos7840_change_port_settings(mos7840_port,old_termios); */
1115 mos7840_port->icount.tx = 0;
1116 mos7840_port->icount.rx = 0;
1117
1118 dbg("usb_serial serial:%p mos7840_port:%p\n usb_serial_port port:%p",
1119 serial, mos7840_port, port);
1120
1121 dbg ("%s leave", __func__);
1122
1123 return 0;
1124
1125 }
1126
1127 /*****************************************************************************
1128 * mos7840_chars_in_buffer
1129 * this function is called by the tty driver when it wants to know how many
1130 * bytes of data we currently have outstanding in the port (data that has
1131 * been written, but hasn't made it out the port yet)
1132 * If successful, we return the number of bytes left to be written in the
1133 * system,
1134 * Otherwise we return zero.
1135 *****************************************************************************/
1136
1137 static int mos7840_chars_in_buffer(struct tty_struct *tty)
1138 {
1139 struct usb_serial_port *port = tty->driver_data;
1140 int i;
1141 int chars = 0;
1142 unsigned long flags;
1143 struct moschip_port *mos7840_port;
1144
1145 dbg("%s", " mos7840_chars_in_buffer:entering ...........");
1146
1147 if (mos7840_port_paranoia_check(port, __func__)) {
1148 dbg("%s", "Invalid port");
1149 return 0;
1150 }
1151
1152 mos7840_port = mos7840_get_port_private(port);
1153 if (mos7840_port == NULL) {
1154 dbg("%s", "mos7840_break:leaving ...........");
1155 return 0;
1156 }
1157
1158 spin_lock_irqsave(&mos7840_port->pool_lock, flags);
1159 for (i = 0; i < NUM_URBS; ++i)
1160 if (mos7840_port->busy[i])
1161 chars += URB_TRANSFER_BUFFER_SIZE;
1162 spin_unlock_irqrestore(&mos7840_port->pool_lock, flags);
1163 dbg("%s - returns %d", __func__, chars);
1164 return chars;
1165
1166 }
1167
1168 /*****************************************************************************
1169 * mos7840_close
1170 * this function is called by the tty driver when a port is closed
1171 *****************************************************************************/
1172
1173 static void mos7840_close(struct usb_serial_port *port)
1174 {
1175 struct usb_serial *serial;
1176 struct moschip_port *mos7840_port;
1177 struct moschip_port *port0;
1178 int j;
1179 __u16 Data;
1180
1181 dbg("%s", "mos7840_close:entering...");
1182
1183 if (mos7840_port_paranoia_check(port, __func__)) {
1184 dbg("%s", "Port Paranoia failed");
1185 return;
1186 }
1187
1188 serial = mos7840_get_usb_serial(port, __func__);
1189 if (!serial) {
1190 dbg("%s", "Serial Paranoia failed");
1191 return;
1192 }
1193
1194 mos7840_port = mos7840_get_port_private(port);
1195 port0 = mos7840_get_port_private(serial->port[0]);
1196
1197 if (mos7840_port == NULL || port0 == NULL)
1198 return;
1199
1200 for (j = 0; j < NUM_URBS; ++j)
1201 usb_kill_urb(mos7840_port->write_urb_pool[j]);
1202
1203 /* Freeing Write URBs */
1204 for (j = 0; j < NUM_URBS; ++j) {
1205 if (mos7840_port->write_urb_pool[j]) {
1206 if (mos7840_port->write_urb_pool[j]->transfer_buffer)
1207 kfree(mos7840_port->write_urb_pool[j]->
1208 transfer_buffer);
1209
1210 usb_free_urb(mos7840_port->write_urb_pool[j]);
1211 }
1212 }
1213
1214 /* While closing port, shutdown all bulk read, write *
1215 * and interrupt read if they exists */
1216 if (serial->dev) {
1217 if (mos7840_port->write_urb) {
1218 dbg("%s", "Shutdown bulk write");
1219 usb_kill_urb(mos7840_port->write_urb);
1220 }
1221 if (mos7840_port->read_urb) {
1222 dbg("%s", "Shutdown bulk read");
1223 usb_kill_urb(mos7840_port->read_urb);
1224 mos7840_port->read_urb_busy = false;
1225 }
1226 if ((&mos7840_port->control_urb)) {
1227 dbg("%s", "Shutdown control read");
1228 /*/ usb_kill_urb (mos7840_port->control_urb); */
1229 }
1230 }
1231 /* if(mos7840_port->ctrl_buf != NULL) */
1232 /* kfree(mos7840_port->ctrl_buf); */
1233 port0->open_ports--;
1234 dbg("mos7840_num_open_ports in close%d:in port%d",
1235 port0->open_ports, port->number);
1236 if (port0->open_ports == 0) {
1237 if (serial->port[0]->interrupt_in_urb) {
1238 dbg("%s", "Shutdown interrupt_in_urb");
1239 usb_kill_urb(serial->port[0]->interrupt_in_urb);
1240 }
1241 }
1242
1243 if (mos7840_port->write_urb) {
1244 /* if this urb had a transfer buffer already (old tx) free it */
1245 if (mos7840_port->write_urb->transfer_buffer != NULL)
1246 kfree(mos7840_port->write_urb->transfer_buffer);
1247 usb_free_urb(mos7840_port->write_urb);
1248 }
1249
1250 Data = 0x0;
1251 mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER, Data);
1252
1253 Data = 0x00;
1254 mos7840_set_uart_reg(port, INTERRUPT_ENABLE_REGISTER, Data);
1255
1256 mos7840_port->open = 0;
1257
1258 dbg("%s", "Leaving ............");
1259 }
1260
1261 /************************************************************************
1262 *
1263 * mos7840_block_until_chase_response
1264 *
1265 * This function will block the close until one of the following:
1266 * 1. Response to our Chase comes from mos7840
1267 * 2. A timeout of 10 seconds without activity has expired
1268 * (1K of mos7840 data @ 2400 baud ==> 4 sec to empty)
1269 *
1270 ************************************************************************/
1271
1272 static void mos7840_block_until_chase_response(struct tty_struct *tty,
1273 struct moschip_port *mos7840_port)
1274 {
1275 int timeout = 1 * HZ;
1276 int wait = 10;
1277 int count;
1278
1279 while (1) {
1280 count = mos7840_chars_in_buffer(tty);
1281
1282 /* Check for Buffer status */
1283 if (count <= 0)
1284 return;
1285
1286 /* Block the thread for a while */
1287 interruptible_sleep_on_timeout(&mos7840_port->wait_chase,
1288 timeout);
1289 /* No activity.. count down section */
1290 wait--;
1291 if (wait == 0) {
1292 dbg("%s - TIMEOUT", __func__);
1293 return;
1294 } else {
1295 /* Reset timeout value back to seconds */
1296 wait = 10;
1297 }
1298 }
1299
1300 }
1301
1302 /*****************************************************************************
1303 * mos7840_break
1304 * this function sends a break to the port
1305 *****************************************************************************/
1306 static void mos7840_break(struct tty_struct *tty, int break_state)
1307 {
1308 struct usb_serial_port *port = tty->driver_data;
1309 unsigned char data;
1310 struct usb_serial *serial;
1311 struct moschip_port *mos7840_port;
1312
1313 dbg("%s", "Entering ...........");
1314 dbg("mos7840_break: Start");
1315
1316 if (mos7840_port_paranoia_check(port, __func__)) {
1317 dbg("%s", "Port Paranoia failed");
1318 return;
1319 }
1320
1321 serial = mos7840_get_usb_serial(port, __func__);
1322 if (!serial) {
1323 dbg("%s", "Serial Paranoia failed");
1324 return;
1325 }
1326
1327 mos7840_port = mos7840_get_port_private(port);
1328
1329 if (mos7840_port == NULL)
1330 return;
1331
1332 if (serial->dev)
1333 /* flush and block until tx is empty */
1334 mos7840_block_until_chase_response(tty, mos7840_port);
1335
1336 if (break_state == -1)
1337 data = mos7840_port->shadowLCR | LCR_SET_BREAK;
1338 else
1339 data = mos7840_port->shadowLCR & ~LCR_SET_BREAK;
1340
1341 /* FIXME: no locking on shadowLCR anywhere in driver */
1342 mos7840_port->shadowLCR = data;
1343 dbg("mcs7840_break mos7840_port->shadowLCR is %x",
1344 mos7840_port->shadowLCR);
1345 mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER,
1346 mos7840_port->shadowLCR);
1347
1348 return;
1349 }
1350
1351 /*****************************************************************************
1352 * mos7840_write_room
1353 * this function is called by the tty driver when it wants to know how many
1354 * bytes of data we can accept for a specific port.
1355 * If successful, we return the amount of room that we have for this port
1356 * Otherwise we return a negative error number.
1357 *****************************************************************************/
1358
1359 static int mos7840_write_room(struct tty_struct *tty)
1360 {
1361 struct usb_serial_port *port = tty->driver_data;
1362 int i;
1363 int room = 0;
1364 unsigned long flags;
1365 struct moschip_port *mos7840_port;
1366
1367 dbg("%s", " mos7840_write_room:entering ...........");
1368
1369 if (mos7840_port_paranoia_check(port, __func__)) {
1370 dbg("%s", "Invalid port");
1371 dbg("%s", " mos7840_write_room:leaving ...........");
1372 return -1;
1373 }
1374
1375 mos7840_port = mos7840_get_port_private(port);
1376 if (mos7840_port == NULL) {
1377 dbg("%s", "mos7840_break:leaving ...........");
1378 return -1;
1379 }
1380
1381 spin_lock_irqsave(&mos7840_port->pool_lock, flags);
1382 for (i = 0; i < NUM_URBS; ++i) {
1383 if (!mos7840_port->busy[i])
1384 room += URB_TRANSFER_BUFFER_SIZE;
1385 }
1386 spin_unlock_irqrestore(&mos7840_port->pool_lock, flags);
1387
1388 room = (room == 0) ? 0 : room - URB_TRANSFER_BUFFER_SIZE + 1;
1389 dbg("%s - returns %d", __func__, room);
1390 return room;
1391
1392 }
1393
1394 /*****************************************************************************
1395 * mos7840_write
1396 * this function is called by the tty driver when data should be written to
1397 * the port.
1398 * If successful, we return the number of bytes written, otherwise we
1399 * return a negative error number.
1400 *****************************************************************************/
1401
1402 static int mos7840_write(struct tty_struct *tty, struct usb_serial_port *port,
1403 const unsigned char *data, int count)
1404 {
1405 int status;
1406 int i;
1407 int bytes_sent = 0;
1408 int transfer_size;
1409 unsigned long flags;
1410
1411 struct moschip_port *mos7840_port;
1412 struct usb_serial *serial;
1413 struct urb *urb;
1414 /* __u16 Data; */
1415 const unsigned char *current_position = data;
1416 unsigned char *data1;
1417 dbg("%s", "entering ...........");
1418 /* dbg("mos7840_write: mos7840_port->shadowLCR is %x",
1419 mos7840_port->shadowLCR); */
1420
1421 #ifdef NOTMOS7840
1422 Data = 0x00;
1423 status = mos7840_get_uart_reg(port, LINE_CONTROL_REGISTER, &Data);
1424 mos7840_port->shadowLCR = Data;
1425 dbg("mos7840_write: LINE_CONTROL_REGISTER is %x", Data);
1426 dbg("mos7840_write: mos7840_port->shadowLCR is %x",
1427 mos7840_port->shadowLCR);
1428
1429 /* Data = 0x03; */
1430 /* status = mos7840_set_uart_reg(port,LINE_CONTROL_REGISTER,Data); */
1431 /* mos7840_port->shadowLCR=Data;//Need to add later */
1432
1433 Data |= SERIAL_LCR_DLAB; /* data latch enable in LCR 0x80 */
1434 status = mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data);
1435
1436 /* Data = 0x0c; */
1437 /* status = mos7840_set_uart_reg(port,DIVISOR_LATCH_LSB,Data); */
1438 Data = 0x00;
1439 status = mos7840_get_uart_reg(port, DIVISOR_LATCH_LSB, &Data);
1440 dbg("mos7840_write:DLL value is %x", Data);
1441
1442 Data = 0x0;
1443 status = mos7840_get_uart_reg(port, DIVISOR_LATCH_MSB, &Data);
1444 dbg("mos7840_write:DLM value is %x", Data);
1445
1446 Data = Data & ~SERIAL_LCR_DLAB;
1447 dbg("mos7840_write: mos7840_port->shadowLCR is %x",
1448 mos7840_port->shadowLCR);
1449 status = mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data);
1450 #endif
1451
1452 if (mos7840_port_paranoia_check(port, __func__)) {
1453 dbg("%s", "Port Paranoia failed");
1454 return -1;
1455 }
1456
1457 serial = port->serial;
1458 if (mos7840_serial_paranoia_check(serial, __func__)) {
1459 dbg("%s", "Serial Paranoia failed");
1460 return -1;
1461 }
1462
1463 mos7840_port = mos7840_get_port_private(port);
1464 if (mos7840_port == NULL) {
1465 dbg("%s", "mos7840_port is NULL");
1466 return -1;
1467 }
1468
1469 /* try to find a free urb in the list */
1470 urb = NULL;
1471
1472 spin_lock_irqsave(&mos7840_port->pool_lock, flags);
1473 for (i = 0; i < NUM_URBS; ++i) {
1474 if (!mos7840_port->busy[i]) {
1475 mos7840_port->busy[i] = 1;
1476 urb = mos7840_port->write_urb_pool[i];
1477 dbg("URB:%d", i);
1478 break;
1479 }
1480 }
1481 spin_unlock_irqrestore(&mos7840_port->pool_lock, flags);
1482
1483 if (urb == NULL) {
1484 dbg("%s - no more free urbs", __func__);
1485 goto exit;
1486 }
1487
1488 if (urb->transfer_buffer == NULL) {
1489 urb->transfer_buffer =
1490 kmalloc(URB_TRANSFER_BUFFER_SIZE, GFP_KERNEL);
1491
1492 if (urb->transfer_buffer == NULL) {
1493 dev_err(&port->dev, "%s no more kernel memory...\n",
1494 __func__);
1495 goto exit;
1496 }
1497 }
1498 transfer_size = min(count, URB_TRANSFER_BUFFER_SIZE);
1499
1500 memcpy(urb->transfer_buffer, current_position, transfer_size);
1501
1502 /* fill urb with data and submit */
1503 usb_fill_bulk_urb(urb,
1504 serial->dev,
1505 usb_sndbulkpipe(serial->dev,
1506 port->bulk_out_endpointAddress),
1507 urb->transfer_buffer,
1508 transfer_size,
1509 mos7840_bulk_out_data_callback, mos7840_port);
1510
1511 data1 = urb->transfer_buffer;
1512 dbg("bulkout endpoint is %d", port->bulk_out_endpointAddress);
1513
1514 /* send it down the pipe */
1515 status = usb_submit_urb(urb, GFP_ATOMIC);
1516
1517 if (status) {
1518 mos7840_port->busy[i] = 0;
1519 dev_err(&port->dev, "%s - usb_submit_urb(write bulk) failed "
1520 "with status = %d\n", __func__, status);
1521 bytes_sent = status;
1522 goto exit;
1523 }
1524 bytes_sent = transfer_size;
1525 mos7840_port->icount.tx += transfer_size;
1526 smp_wmb();
1527 dbg("mos7840_port->icount.tx is %d:", mos7840_port->icount.tx);
1528 exit:
1529 return bytes_sent;
1530
1531 }
1532
1533 /*****************************************************************************
1534 * mos7840_throttle
1535 * this function is called by the tty driver when it wants to stop the data
1536 * being read from the port.
1537 *****************************************************************************/
1538
1539 static void mos7840_throttle(struct tty_struct *tty)
1540 {
1541 struct usb_serial_port *port = tty->driver_data;
1542 struct moschip_port *mos7840_port;
1543 int status;
1544
1545 if (mos7840_port_paranoia_check(port, __func__)) {
1546 dbg("%s", "Invalid port");
1547 return;
1548 }
1549
1550 dbg("- port %d", port->number);
1551
1552 mos7840_port = mos7840_get_port_private(port);
1553
1554 if (mos7840_port == NULL)
1555 return;
1556
1557 if (!mos7840_port->open) {
1558 dbg("%s", "port not opened");
1559 return;
1560 }
1561
1562 dbg("%s", "Entering ..........");
1563
1564 /* if we are implementing XON/XOFF, send the stop character */
1565 if (I_IXOFF(tty)) {
1566 unsigned char stop_char = STOP_CHAR(tty);
1567 status = mos7840_write(tty, port, &stop_char, 1);
1568 if (status <= 0)
1569 return;
1570 }
1571 /* if we are implementing RTS/CTS, toggle that line */
1572 if (tty->termios->c_cflag & CRTSCTS) {
1573 mos7840_port->shadowMCR &= ~MCR_RTS;
1574 status = mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER,
1575 mos7840_port->shadowMCR);
1576 if (status < 0)
1577 return;
1578 }
1579
1580 return;
1581 }
1582
1583 /*****************************************************************************
1584 * mos7840_unthrottle
1585 * this function is called by the tty driver when it wants to resume
1586 * the data being read from the port (called after mos7840_throttle is
1587 * called)
1588 *****************************************************************************/
1589 static void mos7840_unthrottle(struct tty_struct *tty)
1590 {
1591 struct usb_serial_port *port = tty->driver_data;
1592 int status;
1593 struct moschip_port *mos7840_port = mos7840_get_port_private(port);
1594
1595 if (mos7840_port_paranoia_check(port, __func__)) {
1596 dbg("%s", "Invalid port");
1597 return;
1598 }
1599
1600 if (mos7840_port == NULL)
1601 return;
1602
1603 if (!mos7840_port->open) {
1604 dbg("%s - port not opened", __func__);
1605 return;
1606 }
1607
1608 dbg("%s", "Entering ..........");
1609
1610 /* if we are implementing XON/XOFF, send the start character */
1611 if (I_IXOFF(tty)) {
1612 unsigned char start_char = START_CHAR(tty);
1613 status = mos7840_write(tty, port, &start_char, 1);
1614 if (status <= 0)
1615 return;
1616 }
1617
1618 /* if we are implementing RTS/CTS, toggle that line */
1619 if (tty->termios->c_cflag & CRTSCTS) {
1620 mos7840_port->shadowMCR |= MCR_RTS;
1621 status = mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER,
1622 mos7840_port->shadowMCR);
1623 if (status < 0)
1624 return;
1625 }
1626 }
1627
1628 static int mos7840_tiocmget(struct tty_struct *tty, struct file *file)
1629 {
1630 struct usb_serial_port *port = tty->driver_data;
1631 struct moschip_port *mos7840_port;
1632 unsigned int result;
1633 __u16 msr;
1634 __u16 mcr;
1635 int status;
1636 mos7840_port = mos7840_get_port_private(port);
1637
1638 dbg("%s - port %d", __func__, port->number);
1639
1640 if (mos7840_port == NULL)
1641 return -ENODEV;
1642
1643 status = mos7840_get_uart_reg(port, MODEM_STATUS_REGISTER, &msr);
1644 status = mos7840_get_uart_reg(port, MODEM_CONTROL_REGISTER, &mcr);
1645 result = ((mcr & MCR_DTR) ? TIOCM_DTR : 0)
1646 | ((mcr & MCR_RTS) ? TIOCM_RTS : 0)
1647 | ((mcr & MCR_LOOPBACK) ? TIOCM_LOOP : 0)
1648 | ((msr & MOS7840_MSR_CTS) ? TIOCM_CTS : 0)
1649 | ((msr & MOS7840_MSR_CD) ? TIOCM_CAR : 0)
1650 | ((msr & MOS7840_MSR_RI) ? TIOCM_RI : 0)
1651 | ((msr & MOS7840_MSR_DSR) ? TIOCM_DSR : 0);
1652
1653 dbg("%s - 0x%04X", __func__, result);
1654
1655 return result;
1656 }
1657
1658 static int mos7840_tiocmset(struct tty_struct *tty, struct file *file,
1659 unsigned int set, unsigned int clear)
1660 {
1661 struct usb_serial_port *port = tty->driver_data;
1662 struct moschip_port *mos7840_port;
1663 unsigned int mcr;
1664 int status;
1665
1666 dbg("%s - port %d", __func__, port->number);
1667
1668 mos7840_port = mos7840_get_port_private(port);
1669
1670 if (mos7840_port == NULL)
1671 return -ENODEV;
1672
1673 /* FIXME: What locks the port registers ? */
1674 mcr = mos7840_port->shadowMCR;
1675 if (clear & TIOCM_RTS)
1676 mcr &= ~MCR_RTS;
1677 if (clear & TIOCM_DTR)
1678 mcr &= ~MCR_DTR;
1679 if (clear & TIOCM_LOOP)
1680 mcr &= ~MCR_LOOPBACK;
1681
1682 if (set & TIOCM_RTS)
1683 mcr |= MCR_RTS;
1684 if (set & TIOCM_DTR)
1685 mcr |= MCR_DTR;
1686 if (set & TIOCM_LOOP)
1687 mcr |= MCR_LOOPBACK;
1688
1689 mos7840_port->shadowMCR = mcr;
1690
1691 status = mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER, mcr);
1692 if (status < 0) {
1693 dbg("setting MODEM_CONTROL_REGISTER Failed");
1694 return status;
1695 }
1696
1697 return 0;
1698 }
1699
1700 /*****************************************************************************
1701 * mos7840_calc_baud_rate_divisor
1702 * this function calculates the proper baud rate divisor for the specified
1703 * baud rate.
1704 *****************************************************************************/
1705 static int mos7840_calc_baud_rate_divisor(int baudRate, int *divisor,
1706 __u16 *clk_sel_val)
1707 {
1708
1709 dbg("%s - %d", __func__, baudRate);
1710
1711 if (baudRate <= 115200) {
1712 *divisor = 115200 / baudRate;
1713 *clk_sel_val = 0x0;
1714 }
1715 if ((baudRate > 115200) && (baudRate <= 230400)) {
1716 *divisor = 230400 / baudRate;
1717 *clk_sel_val = 0x10;
1718 } else if ((baudRate > 230400) && (baudRate <= 403200)) {
1719 *divisor = 403200 / baudRate;
1720 *clk_sel_val = 0x20;
1721 } else if ((baudRate > 403200) && (baudRate <= 460800)) {
1722 *divisor = 460800 / baudRate;
1723 *clk_sel_val = 0x30;
1724 } else if ((baudRate > 460800) && (baudRate <= 806400)) {
1725 *divisor = 806400 / baudRate;
1726 *clk_sel_val = 0x40;
1727 } else if ((baudRate > 806400) && (baudRate <= 921600)) {
1728 *divisor = 921600 / baudRate;
1729 *clk_sel_val = 0x50;
1730 } else if ((baudRate > 921600) && (baudRate <= 1572864)) {
1731 *divisor = 1572864 / baudRate;
1732 *clk_sel_val = 0x60;
1733 } else if ((baudRate > 1572864) && (baudRate <= 3145728)) {
1734 *divisor = 3145728 / baudRate;
1735 *clk_sel_val = 0x70;
1736 }
1737 return 0;
1738
1739 #ifdef NOTMCS7840
1740
1741 for (i = 0; i < ARRAY_SIZE(mos7840_divisor_table); i++) {
1742 if (mos7840_divisor_table[i].BaudRate == baudrate) {
1743 *divisor = mos7840_divisor_table[i].Divisor;
1744 return 0;
1745 }
1746 }
1747
1748 /* After trying for all the standard baud rates *
1749 * Try calculating the divisor for this baud rate */
1750
1751 if (baudrate > 75 && baudrate < 230400) {
1752 /* get the divisor */
1753 custom = (__u16) (230400L / baudrate);
1754
1755 /* Check for round off */
1756 round1 = (__u16) (2304000L / baudrate);
1757 round = (__u16) (round1 - (custom * 10));
1758 if (round > 4)
1759 custom++;
1760 *divisor = custom;
1761
1762 dbg(" Baud %d = %d", baudrate, custom);
1763 return 0;
1764 }
1765
1766 dbg("%s", " Baud calculation Failed...");
1767 return -1;
1768 #endif
1769 }
1770
1771 /*****************************************************************************
1772 * mos7840_send_cmd_write_baud_rate
1773 * this function sends the proper command to change the baud rate of the
1774 * specified port.
1775 *****************************************************************************/
1776
1777 static int mos7840_send_cmd_write_baud_rate(struct moschip_port *mos7840_port,
1778 int baudRate)
1779 {
1780 int divisor = 0;
1781 int status;
1782 __u16 Data;
1783 unsigned char number;
1784 __u16 clk_sel_val;
1785 struct usb_serial_port *port;
1786
1787 if (mos7840_port == NULL)
1788 return -1;
1789
1790 port = (struct usb_serial_port *)mos7840_port->port;
1791 if (mos7840_port_paranoia_check(port, __func__)) {
1792 dbg("%s", "Invalid port");
1793 return -1;
1794 }
1795
1796 if (mos7840_serial_paranoia_check(port->serial, __func__)) {
1797 dbg("%s", "Invalid Serial");
1798 return -1;
1799 }
1800
1801 dbg("%s", "Entering ..........");
1802
1803 number = mos7840_port->port->number - mos7840_port->port->serial->minor;
1804
1805 dbg("%s - port = %d, baud = %d", __func__,
1806 mos7840_port->port->number, baudRate);
1807 /* reset clk_uart_sel in spregOffset */
1808 if (baudRate > 115200) {
1809 #ifdef HW_flow_control
1810 /* NOTE: need to see the pther register to modify */
1811 /* setting h/w flow control bit to 1 */
1812 Data = 0x2b;
1813 mos7840_port->shadowMCR = Data;
1814 status = mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER,
1815 Data);
1816 if (status < 0) {
1817 dbg("Writing spreg failed in set_serial_baud");
1818 return -1;
1819 }
1820 #endif
1821
1822 } else {
1823 #ifdef HW_flow_control
1824 / *setting h/w flow control bit to 0 */
1825 Data = 0xb;
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 }
1836
1837 if (1) { /* baudRate <= 115200) */
1838 clk_sel_val = 0x0;
1839 Data = 0x0;
1840 status = mos7840_calc_baud_rate_divisor(baudRate, &divisor,
1841 &clk_sel_val);
1842 status = mos7840_get_reg_sync(port, mos7840_port->SpRegOffset,
1843 &Data);
1844 if (status < 0) {
1845 dbg("reading spreg failed in set_serial_baud");
1846 return -1;
1847 }
1848 Data = (Data & 0x8f) | clk_sel_val;
1849 status = mos7840_set_reg_sync(port, mos7840_port->SpRegOffset,
1850 Data);
1851 if (status < 0) {
1852 dbg("Writing spreg failed in set_serial_baud");
1853 return -1;
1854 }
1855 /* Calculate the Divisor */
1856
1857 if (status) {
1858 dev_err(&port->dev, "%s - bad baud rate\n", __func__);
1859 return status;
1860 }
1861 /* Enable access to divisor latch */
1862 Data = mos7840_port->shadowLCR | SERIAL_LCR_DLAB;
1863 mos7840_port->shadowLCR = Data;
1864 mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data);
1865
1866 /* Write the divisor */
1867 Data = (unsigned char)(divisor & 0xff);
1868 dbg("set_serial_baud Value to write DLL is %x", Data);
1869 mos7840_set_uart_reg(port, DIVISOR_LATCH_LSB, Data);
1870
1871 Data = (unsigned char)((divisor & 0xff00) >> 8);
1872 dbg("set_serial_baud Value to write DLM is %x", Data);
1873 mos7840_set_uart_reg(port, DIVISOR_LATCH_MSB, Data);
1874
1875 /* Disable access to divisor latch */
1876 Data = mos7840_port->shadowLCR & ~SERIAL_LCR_DLAB;
1877 mos7840_port->shadowLCR = Data;
1878 mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data);
1879
1880 }
1881 return status;
1882 }
1883
1884 /*****************************************************************************
1885 * mos7840_change_port_settings
1886 * This routine is called to set the UART on the device to match
1887 * the specified new settings.
1888 *****************************************************************************/
1889
1890 static void mos7840_change_port_settings(struct tty_struct *tty,
1891 struct moschip_port *mos7840_port, struct ktermios *old_termios)
1892 {
1893 int baud;
1894 unsigned cflag;
1895 unsigned iflag;
1896 __u8 lData;
1897 __u8 lParity;
1898 __u8 lStop;
1899 int status;
1900 __u16 Data;
1901 struct usb_serial_port *port;
1902 struct usb_serial *serial;
1903
1904 if (mos7840_port == NULL)
1905 return;
1906
1907 port = (struct usb_serial_port *)mos7840_port->port;
1908
1909 if (mos7840_port_paranoia_check(port, __func__)) {
1910 dbg("%s", "Invalid port");
1911 return;
1912 }
1913
1914 if (mos7840_serial_paranoia_check(port->serial, __func__)) {
1915 dbg("%s", "Invalid Serial");
1916 return;
1917 }
1918
1919 serial = port->serial;
1920
1921 dbg("%s - port %d", __func__, mos7840_port->port->number);
1922
1923 if (!mos7840_port->open) {
1924 dbg("%s - port not opened", __func__);
1925 return;
1926 }
1927
1928 dbg("%s", "Entering ..........");
1929
1930 lData = LCR_BITS_8;
1931 lStop = LCR_STOP_1;
1932 lParity = LCR_PAR_NONE;
1933
1934 cflag = tty->termios->c_cflag;
1935 iflag = tty->termios->c_iflag;
1936
1937 /* Change the number of bits */
1938 if (cflag & CSIZE) {
1939 switch (cflag & CSIZE) {
1940 case CS5:
1941 lData = LCR_BITS_5;
1942 break;
1943
1944 case CS6:
1945 lData = LCR_BITS_6;
1946 break;
1947
1948 case CS7:
1949 lData = LCR_BITS_7;
1950 break;
1951 default:
1952 case CS8:
1953 lData = LCR_BITS_8;
1954 break;
1955 }
1956 }
1957 /* Change the Parity bit */
1958 if (cflag & PARENB) {
1959 if (cflag & PARODD) {
1960 lParity = LCR_PAR_ODD;
1961 dbg("%s - parity = odd", __func__);
1962 } else {
1963 lParity = LCR_PAR_EVEN;
1964 dbg("%s - parity = even", __func__);
1965 }
1966
1967 } else {
1968 dbg("%s - parity = none", __func__);
1969 }
1970
1971 if (cflag & CMSPAR)
1972 lParity = lParity | 0x20;
1973
1974 /* Change the Stop bit */
1975 if (cflag & CSTOPB) {
1976 lStop = LCR_STOP_2;
1977 dbg("%s - stop bits = 2", __func__);
1978 } else {
1979 lStop = LCR_STOP_1;
1980 dbg("%s - stop bits = 1", __func__);
1981 }
1982
1983 /* Update the LCR with the correct value */
1984 mos7840_port->shadowLCR &=
1985 ~(LCR_BITS_MASK | LCR_STOP_MASK | LCR_PAR_MASK);
1986 mos7840_port->shadowLCR |= (lData | lParity | lStop);
1987
1988 dbg("mos7840_change_port_settings mos7840_port->shadowLCR is %x",
1989 mos7840_port->shadowLCR);
1990 /* Disable Interrupts */
1991 Data = 0x00;
1992 mos7840_set_uart_reg(port, INTERRUPT_ENABLE_REGISTER, Data);
1993
1994 Data = 0x00;
1995 mos7840_set_uart_reg(port, FIFO_CONTROL_REGISTER, Data);
1996
1997 Data = 0xcf;
1998 mos7840_set_uart_reg(port, FIFO_CONTROL_REGISTER, Data);
1999
2000 /* Send the updated LCR value to the mos7840 */
2001 Data = mos7840_port->shadowLCR;
2002
2003 mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data);
2004
2005 Data = 0x00b;
2006 mos7840_port->shadowMCR = Data;
2007 mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER, Data);
2008 Data = 0x00b;
2009 mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER, Data);
2010
2011 /* set up the MCR register and send it to the mos7840 */
2012
2013 mos7840_port->shadowMCR = MCR_MASTER_IE;
2014 if (cflag & CBAUD)
2015 mos7840_port->shadowMCR |= (MCR_DTR | MCR_RTS);
2016
2017 if (cflag & CRTSCTS)
2018 mos7840_port->shadowMCR |= (MCR_XON_ANY);
2019 else
2020 mos7840_port->shadowMCR &= ~(MCR_XON_ANY);
2021
2022 Data = mos7840_port->shadowMCR;
2023 mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER, Data);
2024
2025 /* Determine divisor based on baud rate */
2026 baud = tty_get_baud_rate(tty);
2027
2028 if (!baud) {
2029 /* pick a default, any default... */
2030 dbg("%s", "Picked default baud...");
2031 baud = 9600;
2032 }
2033
2034 dbg("%s - baud rate = %d", __func__, baud);
2035 status = mos7840_send_cmd_write_baud_rate(mos7840_port, baud);
2036
2037 /* Enable Interrupts */
2038 Data = 0x0c;
2039 mos7840_set_uart_reg(port, INTERRUPT_ENABLE_REGISTER, Data);
2040
2041 if (mos7840_port->read_urb_busy == false) {
2042 mos7840_port->read_urb->dev = serial->dev;
2043 mos7840_port->read_urb_busy = true;
2044 status = usb_submit_urb(mos7840_port->read_urb, GFP_ATOMIC);
2045 if (status) {
2046 dbg("usb_submit_urb(read bulk) failed, status = %d",
2047 status);
2048 mos7840_port->read_urb_busy = false;
2049 }
2050 }
2051 wake_up(&mos7840_port->delta_msr_wait);
2052 mos7840_port->delta_msr_cond = 1;
2053 dbg("mos7840_change_port_settings mos7840_port->shadowLCR is End %x",
2054 mos7840_port->shadowLCR);
2055
2056 return;
2057 }
2058
2059 /*****************************************************************************
2060 * mos7840_set_termios
2061 * this function is called by the tty driver when it wants to change
2062 * the termios structure
2063 *****************************************************************************/
2064
2065 static void mos7840_set_termios(struct tty_struct *tty,
2066 struct usb_serial_port *port,
2067 struct ktermios *old_termios)
2068 {
2069 int status;
2070 unsigned int cflag;
2071 struct usb_serial *serial;
2072 struct moschip_port *mos7840_port;
2073 dbg("mos7840_set_termios: START");
2074 if (mos7840_port_paranoia_check(port, __func__)) {
2075 dbg("%s", "Invalid port");
2076 return;
2077 }
2078
2079 serial = port->serial;
2080
2081 if (mos7840_serial_paranoia_check(serial, __func__)) {
2082 dbg("%s", "Invalid Serial");
2083 return;
2084 }
2085
2086 mos7840_port = mos7840_get_port_private(port);
2087
2088 if (mos7840_port == NULL)
2089 return;
2090
2091 if (!mos7840_port->open) {
2092 dbg("%s - port not opened", __func__);
2093 return;
2094 }
2095
2096 dbg("%s", "setting termios - ");
2097
2098 cflag = tty->termios->c_cflag;
2099
2100 dbg("%s - clfag %08x iflag %08x", __func__,
2101 tty->termios->c_cflag, RELEVANT_IFLAG(tty->termios->c_iflag));
2102 dbg("%s - old clfag %08x old iflag %08x", __func__,
2103 old_termios->c_cflag, RELEVANT_IFLAG(old_termios->c_iflag));
2104 dbg("%s - port %d", __func__, port->number);
2105
2106 /* change the port settings to the new ones specified */
2107
2108 mos7840_change_port_settings(tty, mos7840_port, old_termios);
2109
2110 if (!mos7840_port->read_urb) {
2111 dbg("%s", "URB KILLED !!!!!");
2112 return;
2113 }
2114
2115 if (mos7840_port->read_urb_busy == false) {
2116 mos7840_port->read_urb->dev = serial->dev;
2117 mos7840_port->read_urb_busy = true;
2118 status = usb_submit_urb(mos7840_port->read_urb, GFP_ATOMIC);
2119 if (status) {
2120 dbg("usb_submit_urb(read bulk) failed, status = %d",
2121 status);
2122 mos7840_port->read_urb_busy = false;
2123 }
2124 }
2125 return;
2126 }
2127
2128 /*****************************************************************************
2129 * mos7840_get_lsr_info - get line status register info
2130 *
2131 * Purpose: Let user call ioctl() to get info when the UART physically
2132 * is emptied. On bus types like RS485, the transmitter must
2133 * release the bus after transmitting. This must be done when
2134 * the transmit shift register is empty, not be done when the
2135 * transmit holding register is empty. This functionality
2136 * allows an RS485 driver to be written in user space.
2137 *****************************************************************************/
2138
2139 static int mos7840_get_lsr_info(struct tty_struct *tty,
2140 unsigned int __user *value)
2141 {
2142 int count;
2143 unsigned int result = 0;
2144
2145 count = mos7840_chars_in_buffer(tty);
2146 if (count == 0) {
2147 dbg("%s -- Empty", __func__);
2148 result = TIOCSER_TEMT;
2149 }
2150
2151 if (copy_to_user(value, &result, sizeof(int)))
2152 return -EFAULT;
2153 return 0;
2154 }
2155
2156 /*****************************************************************************
2157 * mos7840_get_serial_info
2158 * function to get information about serial port
2159 *****************************************************************************/
2160
2161 static int mos7840_get_serial_info(struct moschip_port *mos7840_port,
2162 struct serial_struct __user *retinfo)
2163 {
2164 struct serial_struct tmp;
2165
2166 if (mos7840_port == NULL)
2167 return -1;
2168
2169 if (!retinfo)
2170 return -EFAULT;
2171
2172 memset(&tmp, 0, sizeof(tmp));
2173
2174 tmp.type = PORT_16550A;
2175 tmp.line = mos7840_port->port->serial->minor;
2176 tmp.port = mos7840_port->port->number;
2177 tmp.irq = 0;
2178 tmp.flags = ASYNC_SKIP_TEST | ASYNC_AUTO_IRQ;
2179 tmp.xmit_fifo_size = NUM_URBS * URB_TRANSFER_BUFFER_SIZE;
2180 tmp.baud_base = 9600;
2181 tmp.close_delay = 5 * HZ;
2182 tmp.closing_wait = 30 * HZ;
2183
2184 if (copy_to_user(retinfo, &tmp, sizeof(*retinfo)))
2185 return -EFAULT;
2186 return 0;
2187 }
2188
2189 /*****************************************************************************
2190 * SerialIoctl
2191 * this function handles any ioctl calls to the driver
2192 *****************************************************************************/
2193
2194 static int mos7840_ioctl(struct tty_struct *tty, struct file *file,
2195 unsigned int cmd, unsigned long arg)
2196 {
2197 struct usb_serial_port *port = tty->driver_data;
2198 void __user *argp = (void __user *)arg;
2199 struct moschip_port *mos7840_port;
2200
2201 struct async_icount cnow;
2202 struct async_icount cprev;
2203 struct serial_icounter_struct icount;
2204
2205 if (mos7840_port_paranoia_check(port, __func__)) {
2206 dbg("%s", "Invalid port");
2207 return -1;
2208 }
2209
2210 mos7840_port = mos7840_get_port_private(port);
2211
2212 if (mos7840_port == NULL)
2213 return -1;
2214
2215 dbg("%s - port %d, cmd = 0x%x", __func__, port->number, cmd);
2216
2217 switch (cmd) {
2218 /* return number of bytes available */
2219
2220 case TIOCSERGETLSR:
2221 dbg("%s (%d) TIOCSERGETLSR", __func__, port->number);
2222 return mos7840_get_lsr_info(tty, argp);
2223 return 0;
2224
2225 case TIOCGSERIAL:
2226 dbg("%s (%d) TIOCGSERIAL", __func__, port->number);
2227 return mos7840_get_serial_info(mos7840_port, argp);
2228
2229 case TIOCSSERIAL:
2230 dbg("%s (%d) TIOCSSERIAL", __func__, port->number);
2231 break;
2232
2233 case TIOCMIWAIT:
2234 dbg("%s (%d) TIOCMIWAIT", __func__, port->number);
2235 cprev = mos7840_port->icount;
2236 while (1) {
2237 /* interruptible_sleep_on(&mos7840_port->delta_msr_wait); */
2238 mos7840_port->delta_msr_cond = 0;
2239 wait_event_interruptible(mos7840_port->delta_msr_wait,
2240 (mos7840_port->
2241 delta_msr_cond == 1));
2242
2243 /* see if a signal did it */
2244 if (signal_pending(current))
2245 return -ERESTARTSYS;
2246 cnow = mos7840_port->icount;
2247 smp_rmb();
2248 if (cnow.rng == cprev.rng && cnow.dsr == cprev.dsr &&
2249 cnow.dcd == cprev.dcd && cnow.cts == cprev.cts)
2250 return -EIO; /* no change => error */
2251 if (((arg & TIOCM_RNG) && (cnow.rng != cprev.rng)) ||
2252 ((arg & TIOCM_DSR) && (cnow.dsr != cprev.dsr)) ||
2253 ((arg & TIOCM_CD) && (cnow.dcd != cprev.dcd)) ||
2254 ((arg & TIOCM_CTS) && (cnow.cts != cprev.cts))) {
2255 return 0;
2256 }
2257 cprev = cnow;
2258 }
2259 /* NOTREACHED */
2260 break;
2261
2262 case TIOCGICOUNT:
2263 cnow = mos7840_port->icount;
2264 smp_rmb();
2265 icount.cts = cnow.cts;
2266 icount.dsr = cnow.dsr;
2267 icount.rng = cnow.rng;
2268 icount.dcd = cnow.dcd;
2269 icount.rx = cnow.rx;
2270 icount.tx = cnow.tx;
2271 icount.frame = cnow.frame;
2272 icount.overrun = cnow.overrun;
2273 icount.parity = cnow.parity;
2274 icount.brk = cnow.brk;
2275 icount.buf_overrun = cnow.buf_overrun;
2276
2277 dbg("%s (%d) TIOCGICOUNT RX=%d, TX=%d", __func__,
2278 port->number, icount.rx, icount.tx);
2279 if (copy_to_user(argp, &icount, sizeof(icount)))
2280 return -EFAULT;
2281 return 0;
2282 default:
2283 break;
2284 }
2285 return -ENOIOCTLCMD;
2286 }
2287
2288 static int mos7840_calc_num_ports(struct usb_serial *serial)
2289 {
2290 int mos7840_num_ports = 0;
2291
2292 dbg("numberofendpoints: cur %d, alt %d",
2293 (int)serial->interface->cur_altsetting->desc.bNumEndpoints,
2294 (int)serial->interface->altsetting->desc.bNumEndpoints);
2295 if (serial->interface->cur_altsetting->desc.bNumEndpoints == 5) {
2296 mos7840_num_ports = serial->num_ports = 2;
2297 } else if (serial->interface->cur_altsetting->desc.bNumEndpoints == 9) {
2298 serial->num_bulk_in = 4;
2299 serial->num_bulk_out = 4;
2300 mos7840_num_ports = serial->num_ports = 4;
2301 }
2302 dbg ("mos7840_num_ports = %d", mos7840_num_ports);
2303 return mos7840_num_ports;
2304 }
2305
2306 /****************************************************************************
2307 * mos7840_startup
2308 ****************************************************************************/
2309
2310 static int mos7840_startup(struct usb_serial *serial)
2311 {
2312 struct moschip_port *mos7840_port;
2313 struct usb_device *dev;
2314 int i, status;
2315
2316 __u16 Data;
2317 dbg("%s", "mos7840_startup :Entering..........");
2318
2319 if (!serial) {
2320 dbg("%s", "Invalid Handler");
2321 return -1;
2322 }
2323
2324 dev = serial->dev;
2325
2326 dbg("%s", "Entering...");
2327 dbg ("mos7840_startup: serial = %p", serial);
2328
2329 /* we set up the pointers to the endpoints in the mos7840_open *
2330 * function, as the structures aren't created yet. */
2331
2332 /* set up port private structures */
2333 for (i = 0; i < serial->num_ports; ++i) {
2334 dbg ("mos7840_startup: configuring port %d............", i);
2335 mos7840_port = kzalloc(sizeof(struct moschip_port), GFP_KERNEL);
2336 if (mos7840_port == NULL) {
2337 dev_err(&dev->dev, "%s - Out of memory\n", __func__);
2338 status = -ENOMEM;
2339 i--; /* don't follow NULL pointer cleaning up */
2340 goto error;
2341 }
2342
2343 /* Initialize all port interrupt end point to port 0 int
2344 * endpoint. Our device has only one interrupt end point
2345 * common to all port */
2346
2347 mos7840_port->port = serial->port[i];
2348 mos7840_set_port_private(serial->port[i], mos7840_port);
2349 spin_lock_init(&mos7840_port->pool_lock);
2350
2351 /* minor is not initialised until later by
2352 * usb-serial.c:get_free_serial() and cannot therefore be used
2353 * to index device instances */
2354 mos7840_port->port_num = i + 1;
2355 dbg ("serial->port[i]->number = %d", serial->port[i]->number);
2356 dbg ("serial->port[i]->serial->minor = %d", serial->port[i]->serial->minor);
2357 dbg ("mos7840_port->port_num = %d", mos7840_port->port_num);
2358 dbg ("serial->minor = %d", serial->minor);
2359
2360 if (mos7840_port->port_num == 1) {
2361 mos7840_port->SpRegOffset = 0x0;
2362 mos7840_port->ControlRegOffset = 0x1;
2363 mos7840_port->DcrRegOffset = 0x4;
2364 } else if ((mos7840_port->port_num == 2)
2365 && (serial->num_ports == 4)) {
2366 mos7840_port->SpRegOffset = 0x8;
2367 mos7840_port->ControlRegOffset = 0x9;
2368 mos7840_port->DcrRegOffset = 0x16;
2369 } else if ((mos7840_port->port_num == 2)
2370 && (serial->num_ports == 2)) {
2371 mos7840_port->SpRegOffset = 0xa;
2372 mos7840_port->ControlRegOffset = 0xb;
2373 mos7840_port->DcrRegOffset = 0x19;
2374 } else if ((mos7840_port->port_num == 3)
2375 && (serial->num_ports == 4)) {
2376 mos7840_port->SpRegOffset = 0xa;
2377 mos7840_port->ControlRegOffset = 0xb;
2378 mos7840_port->DcrRegOffset = 0x19;
2379 } else if ((mos7840_port->port_num == 4)
2380 && (serial->num_ports == 4)) {
2381 mos7840_port->SpRegOffset = 0xc;
2382 mos7840_port->ControlRegOffset = 0xd;
2383 mos7840_port->DcrRegOffset = 0x1c;
2384 }
2385 mos7840_dump_serial_port(mos7840_port);
2386 mos7840_set_port_private(serial->port[i], mos7840_port);
2387
2388 /* enable rx_disable bit in control register */
2389 status = mos7840_get_reg_sync(serial->port[i],
2390 mos7840_port->ControlRegOffset, &Data);
2391 if (status < 0) {
2392 dbg("Reading ControlReg failed status-0x%x", status);
2393 break;
2394 } else
2395 dbg("ControlReg Reading success val is %x, status%d",
2396 Data, status);
2397 Data |= 0x08; /* setting driver done bit */
2398 Data |= 0x04; /* sp1_bit to have cts change reflect in
2399 modem status reg */
2400
2401 /* Data |= 0x20; //rx_disable bit */
2402 status = mos7840_set_reg_sync(serial->port[i],
2403 mos7840_port->ControlRegOffset, Data);
2404 if (status < 0) {
2405 dbg("Writing ControlReg failed(rx_disable) status-0x%x", status);
2406 break;
2407 } else
2408 dbg("ControlReg Writing success(rx_disable) status%d",
2409 status);
2410
2411 /* Write default values in DCR (i.e 0x01 in DCR0, 0x05 in DCR2
2412 and 0x24 in DCR3 */
2413 Data = 0x01;
2414 status = mos7840_set_reg_sync(serial->port[i],
2415 (__u16) (mos7840_port->DcrRegOffset + 0), Data);
2416 if (status < 0) {
2417 dbg("Writing DCR0 failed status-0x%x", status);
2418 break;
2419 } else
2420 dbg("DCR0 Writing success status%d", status);
2421
2422 Data = 0x05;
2423 status = mos7840_set_reg_sync(serial->port[i],
2424 (__u16) (mos7840_port->DcrRegOffset + 1), Data);
2425 if (status < 0) {
2426 dbg("Writing DCR1 failed status-0x%x", status);
2427 break;
2428 } else
2429 dbg("DCR1 Writing success status%d", status);
2430
2431 Data = 0x24;
2432 status = mos7840_set_reg_sync(serial->port[i],
2433 (__u16) (mos7840_port->DcrRegOffset + 2), Data);
2434 if (status < 0) {
2435 dbg("Writing DCR2 failed status-0x%x", status);
2436 break;
2437 } else
2438 dbg("DCR2 Writing success status%d", status);
2439
2440 /* write values in clkstart0x0 and clkmulti 0x20 */
2441 Data = 0x0;
2442 status = mos7840_set_reg_sync(serial->port[i],
2443 CLK_START_VALUE_REGISTER, Data);
2444 if (status < 0) {
2445 dbg("Writing CLK_START_VALUE_REGISTER failed status-0x%x", status);
2446 break;
2447 } else
2448 dbg("CLK_START_VALUE_REGISTER Writing success status%d", status);
2449
2450 Data = 0x20;
2451 status = mos7840_set_reg_sync(serial->port[i],
2452 CLK_MULTI_REGISTER, Data);
2453 if (status < 0) {
2454 dbg("Writing CLK_MULTI_REGISTER failed status-0x%x",
2455 status);
2456 goto error;
2457 } else
2458 dbg("CLK_MULTI_REGISTER Writing success status%d",
2459 status);
2460
2461 /* write value 0x0 to scratchpad register */
2462 Data = 0x00;
2463 status = mos7840_set_uart_reg(serial->port[i],
2464 SCRATCH_PAD_REGISTER, Data);
2465 if (status < 0) {
2466 dbg("Writing SCRATCH_PAD_REGISTER failed status-0x%x",
2467 status);
2468 break;
2469 } else
2470 dbg("SCRATCH_PAD_REGISTER Writing success status%d",
2471 status);
2472
2473 /* Zero Length flag register */
2474 if ((mos7840_port->port_num != 1)
2475 && (serial->num_ports == 2)) {
2476
2477 Data = 0xff;
2478 status = mos7840_set_reg_sync(serial->port[i],
2479 (__u16) (ZLP_REG1 +
2480 ((__u16)mos7840_port->port_num)), Data);
2481 dbg("ZLIP offset %x",
2482 (__u16) (ZLP_REG1 +
2483 ((__u16) mos7840_port->port_num)));
2484 if (status < 0) {
2485 dbg("Writing ZLP_REG%d failed status-0x%x",
2486 i + 2, status);
2487 break;
2488 } else
2489 dbg("ZLP_REG%d Writing success status%d",
2490 i + 2, status);
2491 } else {
2492 Data = 0xff;
2493 status = mos7840_set_reg_sync(serial->port[i],
2494 (__u16) (ZLP_REG1 +
2495 ((__u16)mos7840_port->port_num) - 0x1), Data);
2496 dbg("ZLIP offset %x",
2497 (__u16) (ZLP_REG1 +
2498 ((__u16) mos7840_port->port_num) - 0x1));
2499 if (status < 0) {
2500 dbg("Writing ZLP_REG%d failed status-0x%x",
2501 i + 1, status);
2502 break;
2503 } else
2504 dbg("ZLP_REG%d Writing success status%d",
2505 i + 1, status);
2506
2507 }
2508 mos7840_port->control_urb = usb_alloc_urb(0, GFP_KERNEL);
2509 mos7840_port->ctrl_buf = kmalloc(16, GFP_KERNEL);
2510 mos7840_port->dr = kmalloc(sizeof(struct usb_ctrlrequest),
2511 GFP_KERNEL);
2512 if (!mos7840_port->control_urb || !mos7840_port->ctrl_buf ||
2513 !mos7840_port->dr) {
2514 status = -ENOMEM;
2515 goto error;
2516 }
2517 }
2518 dbg ("mos7840_startup: all ports configured...........");
2519
2520 /* Zero Length flag enable */
2521 Data = 0x0f;
2522 status = mos7840_set_reg_sync(serial->port[0], ZLP_REG5, Data);
2523 if (status < 0) {
2524 dbg("Writing ZLP_REG5 failed status-0x%x", status);
2525 goto error;
2526 } else
2527 dbg("ZLP_REG5 Writing success status%d", status);
2528
2529 /* setting configuration feature to one */
2530 usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0),
2531 (__u8) 0x03, 0x00, 0x01, 0x00, NULL, 0x00, 5 * HZ);
2532 return 0;
2533 error:
2534 for (/* nothing */; i >= 0; i--) {
2535 mos7840_port = mos7840_get_port_private(serial->port[i]);
2536
2537 kfree(mos7840_port->dr);
2538 kfree(mos7840_port->ctrl_buf);
2539 usb_free_urb(mos7840_port->control_urb);
2540 kfree(mos7840_port);
2541 serial->port[i] = NULL;
2542 }
2543 return status;
2544 }
2545
2546 /****************************************************************************
2547 * mos7840_disconnect
2548 * This function is called whenever the device is removed from the usb bus.
2549 ****************************************************************************/
2550
2551 static void mos7840_disconnect(struct usb_serial *serial)
2552 {
2553 int i;
2554 unsigned long flags;
2555 struct moschip_port *mos7840_port;
2556 dbg("%s", " disconnect :entering..........");
2557
2558 if (!serial) {
2559 dbg("%s", "Invalid Handler");
2560 return;
2561 }
2562
2563 /* check for the ports to be closed,close the ports and disconnect */
2564
2565 /* free private structure allocated for serial port *
2566 * stop reads and writes on all ports */
2567
2568 for (i = 0; i < serial->num_ports; ++i) {
2569 mos7840_port = mos7840_get_port_private(serial->port[i]);
2570 dbg ("mos7840_port %d = %p", i, mos7840_port);
2571 if (mos7840_port) {
2572 spin_lock_irqsave(&mos7840_port->pool_lock, flags);
2573 mos7840_port->zombie = 1;
2574 spin_unlock_irqrestore(&mos7840_port->pool_lock, flags);
2575 usb_kill_urb(mos7840_port->control_urb);
2576 }
2577 }
2578
2579 dbg("%s", "Thank u :: ");
2580
2581 }
2582
2583 /****************************************************************************
2584 * mos7840_release
2585 * This function is called when the usb_serial structure is freed.
2586 ****************************************************************************/
2587
2588 static void mos7840_release(struct usb_serial *serial)
2589 {
2590 int i;
2591 struct moschip_port *mos7840_port;
2592 dbg("%s", " release :entering..........");
2593
2594 if (!serial) {
2595 dbg("%s", "Invalid Handler");
2596 return;
2597 }
2598
2599 /* check for the ports to be closed,close the ports and disconnect */
2600
2601 /* free private structure allocated for serial port *
2602 * stop reads and writes on all ports */
2603
2604 for (i = 0; i < serial->num_ports; ++i) {
2605 mos7840_port = mos7840_get_port_private(serial->port[i]);
2606 dbg("mos7840_port %d = %p", i, mos7840_port);
2607 if (mos7840_port) {
2608 kfree(mos7840_port->ctrl_buf);
2609 kfree(mos7840_port->dr);
2610 kfree(mos7840_port);
2611 }
2612 }
2613
2614 dbg("%s", "Thank u :: ");
2615
2616 }
2617
2618 static struct usb_driver io_driver = {
2619 .name = "mos7840",
2620 .probe = usb_serial_probe,
2621 .disconnect = usb_serial_disconnect,
2622 .id_table = moschip_id_table_combined,
2623 .no_dynamic_id = 1,
2624 };
2625
2626 static struct usb_serial_driver moschip7840_4port_device = {
2627 .driver = {
2628 .owner = THIS_MODULE,
2629 .name = "mos7840",
2630 },
2631 .description = DRIVER_DESC,
2632 .usb_driver = &io_driver,
2633 .id_table = moschip_port_id_table,
2634 .num_ports = 4,
2635 .open = mos7840_open,
2636 .close = mos7840_close,
2637 .write = mos7840_write,
2638 .write_room = mos7840_write_room,
2639 .chars_in_buffer = mos7840_chars_in_buffer,
2640 .throttle = mos7840_throttle,
2641 .unthrottle = mos7840_unthrottle,
2642 .calc_num_ports = mos7840_calc_num_ports,
2643 #ifdef MCSSerialProbe
2644 .probe = mos7840_serial_probe,
2645 #endif
2646 .ioctl = mos7840_ioctl,
2647 .set_termios = mos7840_set_termios,
2648 .break_ctl = mos7840_break,
2649 .tiocmget = mos7840_tiocmget,
2650 .tiocmset = mos7840_tiocmset,
2651 .attach = mos7840_startup,
2652 .disconnect = mos7840_disconnect,
2653 .release = mos7840_release,
2654 .read_bulk_callback = mos7840_bulk_in_callback,
2655 .read_int_callback = mos7840_interrupt_callback,
2656 };
2657
2658 /****************************************************************************
2659 * moschip7840_init
2660 * This is called by the module subsystem, or on startup to initialize us
2661 ****************************************************************************/
2662 static int __init moschip7840_init(void)
2663 {
2664 int retval;
2665
2666 dbg("%s", " mos7840_init :entering..........");
2667
2668 /* Register with the usb serial */
2669 retval = usb_serial_register(&moschip7840_4port_device);
2670
2671 if (retval)
2672 goto failed_port_device_register;
2673
2674 dbg("%s", "Entering...");
2675 printk(KERN_INFO KBUILD_MODNAME ": " DRIVER_VERSION ":"
2676 DRIVER_DESC "\n");
2677
2678 /* Register with the usb */
2679 retval = usb_register(&io_driver);
2680 if (retval == 0) {
2681 dbg("%s", "Leaving...");
2682 return 0;
2683 }
2684 usb_serial_deregister(&moschip7840_4port_device);
2685 failed_port_device_register:
2686 return retval;
2687 }
2688
2689 /****************************************************************************
2690 * moschip7840_exit
2691 * Called when the driver is about to be unloaded.
2692 ****************************************************************************/
2693 static void __exit moschip7840_exit(void)
2694 {
2695
2696 dbg("%s", " mos7840_exit :entering..........");
2697
2698 usb_deregister(&io_driver);
2699
2700 usb_serial_deregister(&moschip7840_4port_device);
2701
2702 dbg("%s", "Entering...");
2703 }
2704
2705 module_init(moschip7840_init);
2706 module_exit(moschip7840_exit);
2707
2708 /* Module information */
2709 MODULE_DESCRIPTION(DRIVER_DESC);
2710 MODULE_LICENSE("GPL");
2711
2712 module_param(debug, bool, S_IRUGO | S_IWUSR);
2713 MODULE_PARM_DESC(debug, "Debug enabled or not");
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