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[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 return;
734 }
735
736 if (status) {
737 dbg("nonzero read bulk status received: %d", status);
738 mos7840_port->read_urb_busy = false;
739 return;
740 }
741
742 port = (struct usb_serial_port *)mos7840_port->port;
743 if (mos7840_port_paranoia_check(port, __func__)) {
744 dbg("%s", "Port Paranoia failed");
745 mos7840_port->read_urb_busy = false;
746 return;
747 }
748
749 serial = mos7840_get_usb_serial(port, __func__);
750 if (!serial) {
751 dbg("%s", "Bad serial pointer");
752 mos7840_port->read_urb_busy = false;
753 return;
754 }
755
756 dbg("%s", "Entering... ");
757
758 data = urb->transfer_buffer;
759
760 dbg("%s", "Entering ...........");
761
762 if (urb->actual_length) {
763 tty = tty_port_tty_get(&mos7840_port->port->port);
764 if (tty) {
765 tty_insert_flip_string(tty, data, urb->actual_length);
766 dbg(" %s ", data);
767 tty_flip_buffer_push(tty);
768 tty_kref_put(tty);
769 }
770 mos7840_port->icount.rx += urb->actual_length;
771 smp_wmb();
772 dbg("mos7840_port->icount.rx is %d:",
773 mos7840_port->icount.rx);
774 }
775
776 if (!mos7840_port->read_urb) {
777 dbg("%s", "URB KILLED !!!");
778 mos7840_port->read_urb_busy = false;
779 return;
780 }
781
782
783 mos7840_port->read_urb->dev = serial->dev;
784
785 mos7840_port->read_urb_busy = true;
786 retval = usb_submit_urb(mos7840_port->read_urb, GFP_ATOMIC);
787
788 if (retval) {
789 dbg("usb_submit_urb(read bulk) failed, retval = %d", retval);
790 mos7840_port->read_urb_busy = false;
791 }
792 }
793
794 /*****************************************************************************
795 * mos7840_bulk_out_data_callback
796 * this is the callback function for when we have finished sending
797 * serial data on the bulk out endpoint.
798 *****************************************************************************/
799
800 static void mos7840_bulk_out_data_callback(struct urb *urb)
801 {
802 struct moschip_port *mos7840_port;
803 struct tty_struct *tty;
804 int status = urb->status;
805 int i;
806
807 mos7840_port = urb->context;
808 spin_lock(&mos7840_port->pool_lock);
809 for (i = 0; i < NUM_URBS; i++) {
810 if (urb == mos7840_port->write_urb_pool[i]) {
811 mos7840_port->busy[i] = 0;
812 break;
813 }
814 }
815 spin_unlock(&mos7840_port->pool_lock);
816
817 if (status) {
818 dbg("nonzero write bulk status received:%d", status);
819 return;
820 }
821
822 if (mos7840_port_paranoia_check(mos7840_port->port, __func__)) {
823 dbg("%s", "Port Paranoia failed");
824 return;
825 }
826
827 dbg("%s", "Entering .........");
828
829 tty = tty_port_tty_get(&mos7840_port->port->port);
830 if (tty && mos7840_port->open)
831 tty_wakeup(tty);
832 tty_kref_put(tty);
833
834 }
835
836 /************************************************************************/
837 /* 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 */
838 /************************************************************************/
839 #ifdef MCSSerialProbe
840 static int mos7840_serial_probe(struct usb_serial *serial,
841 const struct usb_device_id *id)
842 {
843
844 /*need to implement the mode_reg reading and updating\
845 structures usb_serial_ device_type\
846 (i.e num_ports, num_bulkin,bulkout etc) */
847 /* Also we can update the changes attach */
848 return 1;
849 }
850 #endif
851
852 /*****************************************************************************
853 * mos7840_open
854 * this function is called by the tty driver when a port is opened
855 * If successful, we return 0
856 * Otherwise we return a negative error number.
857 *****************************************************************************/
858
859 static int mos7840_open(struct tty_struct *tty, struct usb_serial_port *port)
860 {
861 int response;
862 int j;
863 struct usb_serial *serial;
864 struct urb *urb;
865 __u16 Data;
866 int status;
867 struct moschip_port *mos7840_port;
868 struct moschip_port *port0;
869
870 dbg ("%s enter", __func__);
871
872 if (mos7840_port_paranoia_check(port, __func__)) {
873 dbg("%s", "Port Paranoia failed");
874 return -ENODEV;
875 }
876
877 serial = port->serial;
878
879 if (mos7840_serial_paranoia_check(serial, __func__)) {
880 dbg("%s", "Serial Paranoia failed");
881 return -ENODEV;
882 }
883
884 mos7840_port = mos7840_get_port_private(port);
885 port0 = mos7840_get_port_private(serial->port[0]);
886
887 if (mos7840_port == NULL || port0 == NULL)
888 return -ENODEV;
889
890 usb_clear_halt(serial->dev, port->write_urb->pipe);
891 usb_clear_halt(serial->dev, port->read_urb->pipe);
892 port0->open_ports++;
893
894 /* Initialising the write urb pool */
895 for (j = 0; j < NUM_URBS; ++j) {
896 urb = usb_alloc_urb(0, GFP_KERNEL);
897 mos7840_port->write_urb_pool[j] = urb;
898
899 if (urb == NULL) {
900 dev_err(&port->dev, "No more urbs???\n");
901 continue;
902 }
903
904 urb->transfer_buffer = kmalloc(URB_TRANSFER_BUFFER_SIZE,
905 GFP_KERNEL);
906 if (!urb->transfer_buffer) {
907 usb_free_urb(urb);
908 mos7840_port->write_urb_pool[j] = NULL;
909 dev_err(&port->dev,
910 "%s-out of memory for urb buffers.\n",
911 __func__);
912 continue;
913 }
914 }
915
916 /*****************************************************************************
917 * Initialize MCS7840 -- Write Init values to corresponding Registers
918 *
919 * Register Index
920 * 1 : IER
921 * 2 : FCR
922 * 3 : LCR
923 * 4 : MCR
924 *
925 * 0x08 : SP1/2 Control Reg
926 *****************************************************************************/
927
928 /* NEED to check the following Block */
929
930 Data = 0x0;
931 status = mos7840_get_reg_sync(port, mos7840_port->SpRegOffset, &Data);
932 if (status < 0) {
933 dbg("Reading Spreg failed");
934 return -1;
935 }
936 Data |= 0x80;
937 status = mos7840_set_reg_sync(port, mos7840_port->SpRegOffset, Data);
938 if (status < 0) {
939 dbg("writing Spreg failed");
940 return -1;
941 }
942
943 Data &= ~0x80;
944 status = mos7840_set_reg_sync(port, mos7840_port->SpRegOffset, Data);
945 if (status < 0) {
946 dbg("writing Spreg failed");
947 return -1;
948 }
949 /* End of block to be checked */
950
951 Data = 0x0;
952 status = mos7840_get_reg_sync(port, mos7840_port->ControlRegOffset,
953 &Data);
954 if (status < 0) {
955 dbg("Reading Controlreg failed");
956 return -1;
957 }
958 Data |= 0x08; /* Driver done bit */
959 Data |= 0x20; /* rx_disable */
960 status = mos7840_set_reg_sync(port,
961 mos7840_port->ControlRegOffset, Data);
962 if (status < 0) {
963 dbg("writing Controlreg failed");
964 return -1;
965 }
966 /* do register settings here */
967 /* Set all regs to the device default values. */
968 /***********************************
969 * First Disable all interrupts.
970 ***********************************/
971 Data = 0x00;
972 status = mos7840_set_uart_reg(port, INTERRUPT_ENABLE_REGISTER, Data);
973 if (status < 0) {
974 dbg("disabling interrupts failed");
975 return -1;
976 }
977 /* Set FIFO_CONTROL_REGISTER to the default value */
978 Data = 0x00;
979 status = mos7840_set_uart_reg(port, FIFO_CONTROL_REGISTER, Data);
980 if (status < 0) {
981 dbg("Writing FIFO_CONTROL_REGISTER failed");
982 return -1;
983 }
984
985 Data = 0xcf;
986 status = mos7840_set_uart_reg(port, FIFO_CONTROL_REGISTER, Data);
987 if (status < 0) {
988 dbg("Writing FIFO_CONTROL_REGISTER failed");
989 return -1;
990 }
991
992 Data = 0x03;
993 status = mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data);
994 mos7840_port->shadowLCR = Data;
995
996 Data = 0x0b;
997 status = mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER, Data);
998 mos7840_port->shadowMCR = Data;
999
1000 Data = 0x00;
1001 status = mos7840_get_uart_reg(port, LINE_CONTROL_REGISTER, &Data);
1002 mos7840_port->shadowLCR = Data;
1003
1004 Data |= SERIAL_LCR_DLAB; /* data latch enable in LCR 0x80 */
1005 status = mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data);
1006
1007 Data = 0x0c;
1008 status = mos7840_set_uart_reg(port, DIVISOR_LATCH_LSB, Data);
1009
1010 Data = 0x0;
1011 status = mos7840_set_uart_reg(port, DIVISOR_LATCH_MSB, Data);
1012
1013 Data = 0x00;
1014 status = mos7840_get_uart_reg(port, LINE_CONTROL_REGISTER, &Data);
1015
1016 Data = Data & ~SERIAL_LCR_DLAB;
1017 status = mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data);
1018 mos7840_port->shadowLCR = Data;
1019
1020 /* clearing Bulkin and Bulkout Fifo */
1021 Data = 0x0;
1022 status = mos7840_get_reg_sync(port, mos7840_port->SpRegOffset, &Data);
1023
1024 Data = Data | 0x0c;
1025 status = mos7840_set_reg_sync(port, mos7840_port->SpRegOffset, Data);
1026
1027 Data = Data & ~0x0c;
1028 status = mos7840_set_reg_sync(port, mos7840_port->SpRegOffset, Data);
1029 /* Finally enable all interrupts */
1030 Data = 0x0c;
1031 status = mos7840_set_uart_reg(port, INTERRUPT_ENABLE_REGISTER, Data);
1032
1033 /* clearing rx_disable */
1034 Data = 0x0;
1035 status = mos7840_get_reg_sync(port, mos7840_port->ControlRegOffset,
1036 &Data);
1037 Data = Data & ~0x20;
1038 status = mos7840_set_reg_sync(port, mos7840_port->ControlRegOffset,
1039 Data);
1040
1041 /* rx_negate */
1042 Data = 0x0;
1043 status = mos7840_get_reg_sync(port, mos7840_port->ControlRegOffset,
1044 &Data);
1045 Data = Data | 0x10;
1046 status = mos7840_set_reg_sync(port, mos7840_port->ControlRegOffset,
1047 Data);
1048
1049 /* Check to see if we've set up our endpoint info yet *
1050 * (can't set it up in mos7840_startup as the structures *
1051 * were not set up at that time.) */
1052 if (port0->open_ports == 1) {
1053 if (serial->port[0]->interrupt_in_buffer == NULL) {
1054 /* set up interrupt urb */
1055 usb_fill_int_urb(serial->port[0]->interrupt_in_urb,
1056 serial->dev,
1057 usb_rcvintpipe(serial->dev,
1058 serial->port[0]->interrupt_in_endpointAddress),
1059 serial->port[0]->interrupt_in_buffer,
1060 serial->port[0]->interrupt_in_urb->
1061 transfer_buffer_length,
1062 mos7840_interrupt_callback,
1063 serial,
1064 serial->port[0]->interrupt_in_urb->interval);
1065
1066 /* start interrupt read for mos7840 *
1067 * will continue as long as mos7840 is connected */
1068
1069 response =
1070 usb_submit_urb(serial->port[0]->interrupt_in_urb,
1071 GFP_KERNEL);
1072 if (response) {
1073 dev_err(&port->dev, "%s - Error %d submitting "
1074 "interrupt urb\n", __func__, response);
1075 }
1076
1077 }
1078
1079 }
1080
1081 /* see if we've set up our endpoint info yet *
1082 * (can't set it up in mos7840_startup as the *
1083 * structures were not set up at that time.) */
1084
1085 dbg("port number is %d", port->number);
1086 dbg("serial number is %d", port->serial->minor);
1087 dbg("Bulkin endpoint is %d", port->bulk_in_endpointAddress);
1088 dbg("BulkOut endpoint is %d", port->bulk_out_endpointAddress);
1089 dbg("Interrupt endpoint is %d", port->interrupt_in_endpointAddress);
1090 dbg("port's number in the device is %d", mos7840_port->port_num);
1091 mos7840_port->read_urb = port->read_urb;
1092
1093 /* set up our bulk in urb */
1094
1095 usb_fill_bulk_urb(mos7840_port->read_urb,
1096 serial->dev,
1097 usb_rcvbulkpipe(serial->dev,
1098 port->bulk_in_endpointAddress),
1099 port->bulk_in_buffer,
1100 mos7840_port->read_urb->transfer_buffer_length,
1101 mos7840_bulk_in_callback, mos7840_port);
1102
1103 dbg("mos7840_open: bulkin endpoint is %d",
1104 port->bulk_in_endpointAddress);
1105 mos7840_port->read_urb_busy = true;
1106 response = usb_submit_urb(mos7840_port->read_urb, GFP_KERNEL);
1107 if (response) {
1108 dev_err(&port->dev, "%s - Error %d submitting control urb\n",
1109 __func__, response);
1110 mos7840_port->read_urb_busy = false;
1111 }
1112
1113 /* initialize our wait queues */
1114 init_waitqueue_head(&mos7840_port->wait_chase);
1115 init_waitqueue_head(&mos7840_port->delta_msr_wait);
1116
1117 /* initialize our icount structure */
1118 memset(&(mos7840_port->icount), 0x00, sizeof(mos7840_port->icount));
1119
1120 /* initialize our port settings */
1121 /* Must set to enable ints! */
1122 mos7840_port->shadowMCR = MCR_MASTER_IE;
1123 /* send a open port command */
1124 mos7840_port->open = 1;
1125 /* mos7840_change_port_settings(mos7840_port,old_termios); */
1126 mos7840_port->icount.tx = 0;
1127 mos7840_port->icount.rx = 0;
1128
1129 dbg("usb_serial serial:%p mos7840_port:%p\n usb_serial_port port:%p",
1130 serial, mos7840_port, port);
1131
1132 dbg ("%s leave", __func__);
1133
1134 return 0;
1135
1136 }
1137
1138 /*****************************************************************************
1139 * mos7840_chars_in_buffer
1140 * this function is called by the tty driver when it wants to know how many
1141 * bytes of data we currently have outstanding in the port (data that has
1142 * been written, but hasn't made it out the port yet)
1143 * If successful, we return the number of bytes left to be written in the
1144 * system,
1145 * Otherwise we return zero.
1146 *****************************************************************************/
1147
1148 static int mos7840_chars_in_buffer(struct tty_struct *tty)
1149 {
1150 struct usb_serial_port *port = tty->driver_data;
1151 int i;
1152 int chars = 0;
1153 unsigned long flags;
1154 struct moschip_port *mos7840_port;
1155
1156 dbg("%s", " mos7840_chars_in_buffer:entering ...........");
1157
1158 if (mos7840_port_paranoia_check(port, __func__)) {
1159 dbg("%s", "Invalid port");
1160 return 0;
1161 }
1162
1163 mos7840_port = mos7840_get_port_private(port);
1164 if (mos7840_port == NULL) {
1165 dbg("%s", "mos7840_break:leaving ...........");
1166 return 0;
1167 }
1168
1169 spin_lock_irqsave(&mos7840_port->pool_lock, flags);
1170 for (i = 0; i < NUM_URBS; ++i)
1171 if (mos7840_port->busy[i])
1172 chars += URB_TRANSFER_BUFFER_SIZE;
1173 spin_unlock_irqrestore(&mos7840_port->pool_lock, flags);
1174 dbg("%s - returns %d", __func__, chars);
1175 return chars;
1176
1177 }
1178
1179 /*****************************************************************************
1180 * mos7840_close
1181 * this function is called by the tty driver when a port is closed
1182 *****************************************************************************/
1183
1184 static void mos7840_close(struct usb_serial_port *port)
1185 {
1186 struct usb_serial *serial;
1187 struct moschip_port *mos7840_port;
1188 struct moschip_port *port0;
1189 int j;
1190 __u16 Data;
1191
1192 dbg("%s", "mos7840_close:entering...");
1193
1194 if (mos7840_port_paranoia_check(port, __func__)) {
1195 dbg("%s", "Port Paranoia failed");
1196 return;
1197 }
1198
1199 serial = mos7840_get_usb_serial(port, __func__);
1200 if (!serial) {
1201 dbg("%s", "Serial Paranoia failed");
1202 return;
1203 }
1204
1205 mos7840_port = mos7840_get_port_private(port);
1206 port0 = mos7840_get_port_private(serial->port[0]);
1207
1208 if (mos7840_port == NULL || port0 == NULL)
1209 return;
1210
1211 for (j = 0; j < NUM_URBS; ++j)
1212 usb_kill_urb(mos7840_port->write_urb_pool[j]);
1213
1214 /* Freeing Write URBs */
1215 for (j = 0; j < NUM_URBS; ++j) {
1216 if (mos7840_port->write_urb_pool[j]) {
1217 if (mos7840_port->write_urb_pool[j]->transfer_buffer)
1218 kfree(mos7840_port->write_urb_pool[j]->
1219 transfer_buffer);
1220
1221 usb_free_urb(mos7840_port->write_urb_pool[j]);
1222 }
1223 }
1224
1225 /* While closing port, shutdown all bulk read, write *
1226 * and interrupt read if they exists */
1227 if (serial->dev) {
1228 if (mos7840_port->write_urb) {
1229 dbg("%s", "Shutdown bulk write");
1230 usb_kill_urb(mos7840_port->write_urb);
1231 }
1232 if (mos7840_port->read_urb) {
1233 dbg("%s", "Shutdown bulk read");
1234 usb_kill_urb(mos7840_port->read_urb);
1235 mos7840_port->read_urb_busy = false;
1236 }
1237 if ((&mos7840_port->control_urb)) {
1238 dbg("%s", "Shutdown control read");
1239 /*/ usb_kill_urb (mos7840_port->control_urb); */
1240 }
1241 }
1242 /* if(mos7840_port->ctrl_buf != NULL) */
1243 /* kfree(mos7840_port->ctrl_buf); */
1244 port0->open_ports--;
1245 dbg("mos7840_num_open_ports in close%d:in port%d",
1246 port0->open_ports, port->number);
1247 if (port0->open_ports == 0) {
1248 if (serial->port[0]->interrupt_in_urb) {
1249 dbg("%s", "Shutdown interrupt_in_urb");
1250 usb_kill_urb(serial->port[0]->interrupt_in_urb);
1251 }
1252 }
1253
1254 if (mos7840_port->write_urb) {
1255 /* if this urb had a transfer buffer already (old tx) free it */
1256 if (mos7840_port->write_urb->transfer_buffer != NULL)
1257 kfree(mos7840_port->write_urb->transfer_buffer);
1258 usb_free_urb(mos7840_port->write_urb);
1259 }
1260
1261 Data = 0x0;
1262 mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER, Data);
1263
1264 Data = 0x00;
1265 mos7840_set_uart_reg(port, INTERRUPT_ENABLE_REGISTER, Data);
1266
1267 mos7840_port->open = 0;
1268
1269 dbg("%s", "Leaving ............");
1270 }
1271
1272 /************************************************************************
1273 *
1274 * mos7840_block_until_chase_response
1275 *
1276 * This function will block the close until one of the following:
1277 * 1. Response to our Chase comes from mos7840
1278 * 2. A timeout of 10 seconds without activity has expired
1279 * (1K of mos7840 data @ 2400 baud ==> 4 sec to empty)
1280 *
1281 ************************************************************************/
1282
1283 static void mos7840_block_until_chase_response(struct tty_struct *tty,
1284 struct moschip_port *mos7840_port)
1285 {
1286 int timeout = 1 * HZ;
1287 int wait = 10;
1288 int count;
1289
1290 while (1) {
1291 count = mos7840_chars_in_buffer(tty);
1292
1293 /* Check for Buffer status */
1294 if (count <= 0)
1295 return;
1296
1297 /* Block the thread for a while */
1298 interruptible_sleep_on_timeout(&mos7840_port->wait_chase,
1299 timeout);
1300 /* No activity.. count down section */
1301 wait--;
1302 if (wait == 0) {
1303 dbg("%s - TIMEOUT", __func__);
1304 return;
1305 } else {
1306 /* Reset timeout value back to seconds */
1307 wait = 10;
1308 }
1309 }
1310
1311 }
1312
1313 /*****************************************************************************
1314 * mos7840_break
1315 * this function sends a break to the port
1316 *****************************************************************************/
1317 static void mos7840_break(struct tty_struct *tty, int break_state)
1318 {
1319 struct usb_serial_port *port = tty->driver_data;
1320 unsigned char data;
1321 struct usb_serial *serial;
1322 struct moschip_port *mos7840_port;
1323
1324 dbg("%s", "Entering ...........");
1325 dbg("mos7840_break: Start");
1326
1327 if (mos7840_port_paranoia_check(port, __func__)) {
1328 dbg("%s", "Port Paranoia failed");
1329 return;
1330 }
1331
1332 serial = mos7840_get_usb_serial(port, __func__);
1333 if (!serial) {
1334 dbg("%s", "Serial Paranoia failed");
1335 return;
1336 }
1337
1338 mos7840_port = mos7840_get_port_private(port);
1339
1340 if (mos7840_port == NULL)
1341 return;
1342
1343 if (serial->dev)
1344 /* flush and block until tx is empty */
1345 mos7840_block_until_chase_response(tty, mos7840_port);
1346
1347 if (break_state == -1)
1348 data = mos7840_port->shadowLCR | LCR_SET_BREAK;
1349 else
1350 data = mos7840_port->shadowLCR & ~LCR_SET_BREAK;
1351
1352 /* FIXME: no locking on shadowLCR anywhere in driver */
1353 mos7840_port->shadowLCR = data;
1354 dbg("mcs7840_break mos7840_port->shadowLCR is %x",
1355 mos7840_port->shadowLCR);
1356 mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER,
1357 mos7840_port->shadowLCR);
1358
1359 return;
1360 }
1361
1362 /*****************************************************************************
1363 * mos7840_write_room
1364 * this function is called by the tty driver when it wants to know how many
1365 * bytes of data we can accept for a specific port.
1366 * If successful, we return the amount of room that we have for this port
1367 * Otherwise we return a negative error number.
1368 *****************************************************************************/
1369
1370 static int mos7840_write_room(struct tty_struct *tty)
1371 {
1372 struct usb_serial_port *port = tty->driver_data;
1373 int i;
1374 int room = 0;
1375 unsigned long flags;
1376 struct moschip_port *mos7840_port;
1377
1378 dbg("%s", " mos7840_write_room:entering ...........");
1379
1380 if (mos7840_port_paranoia_check(port, __func__)) {
1381 dbg("%s", "Invalid port");
1382 dbg("%s", " mos7840_write_room:leaving ...........");
1383 return -1;
1384 }
1385
1386 mos7840_port = mos7840_get_port_private(port);
1387 if (mos7840_port == NULL) {
1388 dbg("%s", "mos7840_break:leaving ...........");
1389 return -1;
1390 }
1391
1392 spin_lock_irqsave(&mos7840_port->pool_lock, flags);
1393 for (i = 0; i < NUM_URBS; ++i) {
1394 if (!mos7840_port->busy[i])
1395 room += URB_TRANSFER_BUFFER_SIZE;
1396 }
1397 spin_unlock_irqrestore(&mos7840_port->pool_lock, flags);
1398
1399 room = (room == 0) ? 0 : room - URB_TRANSFER_BUFFER_SIZE + 1;
1400 dbg("%s - returns %d", __func__, room);
1401 return room;
1402
1403 }
1404
1405 /*****************************************************************************
1406 * mos7840_write
1407 * this function is called by the tty driver when data should be written to
1408 * the port.
1409 * If successful, we return the number of bytes written, otherwise we
1410 * return a negative error number.
1411 *****************************************************************************/
1412
1413 static int mos7840_write(struct tty_struct *tty, struct usb_serial_port *port,
1414 const unsigned char *data, int count)
1415 {
1416 int status;
1417 int i;
1418 int bytes_sent = 0;
1419 int transfer_size;
1420 unsigned long flags;
1421
1422 struct moschip_port *mos7840_port;
1423 struct usb_serial *serial;
1424 struct urb *urb;
1425 /* __u16 Data; */
1426 const unsigned char *current_position = data;
1427 unsigned char *data1;
1428 dbg("%s", "entering ...........");
1429 /* dbg("mos7840_write: mos7840_port->shadowLCR is %x",
1430 mos7840_port->shadowLCR); */
1431
1432 #ifdef NOTMOS7840
1433 Data = 0x00;
1434 status = mos7840_get_uart_reg(port, LINE_CONTROL_REGISTER, &Data);
1435 mos7840_port->shadowLCR = Data;
1436 dbg("mos7840_write: LINE_CONTROL_REGISTER is %x", Data);
1437 dbg("mos7840_write: mos7840_port->shadowLCR is %x",
1438 mos7840_port->shadowLCR);
1439
1440 /* Data = 0x03; */
1441 /* status = mos7840_set_uart_reg(port,LINE_CONTROL_REGISTER,Data); */
1442 /* mos7840_port->shadowLCR=Data;//Need to add later */
1443
1444 Data |= SERIAL_LCR_DLAB; /* data latch enable in LCR 0x80 */
1445 status = mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data);
1446
1447 /* Data = 0x0c; */
1448 /* status = mos7840_set_uart_reg(port,DIVISOR_LATCH_LSB,Data); */
1449 Data = 0x00;
1450 status = mos7840_get_uart_reg(port, DIVISOR_LATCH_LSB, &Data);
1451 dbg("mos7840_write:DLL value is %x", Data);
1452
1453 Data = 0x0;
1454 status = mos7840_get_uart_reg(port, DIVISOR_LATCH_MSB, &Data);
1455 dbg("mos7840_write:DLM value is %x", Data);
1456
1457 Data = Data & ~SERIAL_LCR_DLAB;
1458 dbg("mos7840_write: mos7840_port->shadowLCR is %x",
1459 mos7840_port->shadowLCR);
1460 status = mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data);
1461 #endif
1462
1463 if (mos7840_port_paranoia_check(port, __func__)) {
1464 dbg("%s", "Port Paranoia failed");
1465 return -1;
1466 }
1467
1468 serial = port->serial;
1469 if (mos7840_serial_paranoia_check(serial, __func__)) {
1470 dbg("%s", "Serial Paranoia failed");
1471 return -1;
1472 }
1473
1474 mos7840_port = mos7840_get_port_private(port);
1475 if (mos7840_port == NULL) {
1476 dbg("%s", "mos7840_port is NULL");
1477 return -1;
1478 }
1479
1480 /* try to find a free urb in the list */
1481 urb = NULL;
1482
1483 spin_lock_irqsave(&mos7840_port->pool_lock, flags);
1484 for (i = 0; i < NUM_URBS; ++i) {
1485 if (!mos7840_port->busy[i]) {
1486 mos7840_port->busy[i] = 1;
1487 urb = mos7840_port->write_urb_pool[i];
1488 dbg("URB:%d", i);
1489 break;
1490 }
1491 }
1492 spin_unlock_irqrestore(&mos7840_port->pool_lock, flags);
1493
1494 if (urb == NULL) {
1495 dbg("%s - no more free urbs", __func__);
1496 goto exit;
1497 }
1498
1499 if (urb->transfer_buffer == NULL) {
1500 urb->transfer_buffer =
1501 kmalloc(URB_TRANSFER_BUFFER_SIZE, GFP_KERNEL);
1502
1503 if (urb->transfer_buffer == NULL) {
1504 dev_err(&port->dev, "%s no more kernel memory...\n",
1505 __func__);
1506 goto exit;
1507 }
1508 }
1509 transfer_size = min(count, URB_TRANSFER_BUFFER_SIZE);
1510
1511 memcpy(urb->transfer_buffer, current_position, transfer_size);
1512
1513 /* fill urb with data and submit */
1514 usb_fill_bulk_urb(urb,
1515 serial->dev,
1516 usb_sndbulkpipe(serial->dev,
1517 port->bulk_out_endpointAddress),
1518 urb->transfer_buffer,
1519 transfer_size,
1520 mos7840_bulk_out_data_callback, mos7840_port);
1521
1522 data1 = urb->transfer_buffer;
1523 dbg("bulkout endpoint is %d", port->bulk_out_endpointAddress);
1524
1525 /* send it down the pipe */
1526 status = usb_submit_urb(urb, GFP_ATOMIC);
1527
1528 if (status) {
1529 mos7840_port->busy[i] = 0;
1530 dev_err(&port->dev, "%s - usb_submit_urb(write bulk) failed "
1531 "with status = %d\n", __func__, status);
1532 bytes_sent = status;
1533 goto exit;
1534 }
1535 bytes_sent = transfer_size;
1536 mos7840_port->icount.tx += transfer_size;
1537 smp_wmb();
1538 dbg("mos7840_port->icount.tx is %d:", mos7840_port->icount.tx);
1539 exit:
1540 return bytes_sent;
1541
1542 }
1543
1544 /*****************************************************************************
1545 * mos7840_throttle
1546 * this function is called by the tty driver when it wants to stop the data
1547 * being read from the port.
1548 *****************************************************************************/
1549
1550 static void mos7840_throttle(struct tty_struct *tty)
1551 {
1552 struct usb_serial_port *port = tty->driver_data;
1553 struct moschip_port *mos7840_port;
1554 int status;
1555
1556 if (mos7840_port_paranoia_check(port, __func__)) {
1557 dbg("%s", "Invalid port");
1558 return;
1559 }
1560
1561 dbg("- port %d", port->number);
1562
1563 mos7840_port = mos7840_get_port_private(port);
1564
1565 if (mos7840_port == NULL)
1566 return;
1567
1568 if (!mos7840_port->open) {
1569 dbg("%s", "port not opened");
1570 return;
1571 }
1572
1573 dbg("%s", "Entering ..........");
1574
1575 /* if we are implementing XON/XOFF, send the stop character */
1576 if (I_IXOFF(tty)) {
1577 unsigned char stop_char = STOP_CHAR(tty);
1578 status = mos7840_write(tty, port, &stop_char, 1);
1579 if (status <= 0)
1580 return;
1581 }
1582 /* if we are implementing RTS/CTS, toggle that line */
1583 if (tty->termios->c_cflag & CRTSCTS) {
1584 mos7840_port->shadowMCR &= ~MCR_RTS;
1585 status = mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER,
1586 mos7840_port->shadowMCR);
1587 if (status < 0)
1588 return;
1589 }
1590
1591 return;
1592 }
1593
1594 /*****************************************************************************
1595 * mos7840_unthrottle
1596 * this function is called by the tty driver when it wants to resume
1597 * the data being read from the port (called after mos7840_throttle is
1598 * called)
1599 *****************************************************************************/
1600 static void mos7840_unthrottle(struct tty_struct *tty)
1601 {
1602 struct usb_serial_port *port = tty->driver_data;
1603 int status;
1604 struct moschip_port *mos7840_port = mos7840_get_port_private(port);
1605
1606 if (mos7840_port_paranoia_check(port, __func__)) {
1607 dbg("%s", "Invalid port");
1608 return;
1609 }
1610
1611 if (mos7840_port == NULL)
1612 return;
1613
1614 if (!mos7840_port->open) {
1615 dbg("%s - port not opened", __func__);
1616 return;
1617 }
1618
1619 dbg("%s", "Entering ..........");
1620
1621 /* if we are implementing XON/XOFF, send the start character */
1622 if (I_IXOFF(tty)) {
1623 unsigned char start_char = START_CHAR(tty);
1624 status = mos7840_write(tty, port, &start_char, 1);
1625 if (status <= 0)
1626 return;
1627 }
1628
1629 /* if we are implementing RTS/CTS, toggle that line */
1630 if (tty->termios->c_cflag & CRTSCTS) {
1631 mos7840_port->shadowMCR |= MCR_RTS;
1632 status = mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER,
1633 mos7840_port->shadowMCR);
1634 if (status < 0)
1635 return;
1636 }
1637 }
1638
1639 static int mos7840_tiocmget(struct tty_struct *tty, struct file *file)
1640 {
1641 struct usb_serial_port *port = tty->driver_data;
1642 struct moschip_port *mos7840_port;
1643 unsigned int result;
1644 __u16 msr;
1645 __u16 mcr;
1646 int status;
1647 mos7840_port = mos7840_get_port_private(port);
1648
1649 dbg("%s - port %d", __func__, port->number);
1650
1651 if (mos7840_port == NULL)
1652 return -ENODEV;
1653
1654 status = mos7840_get_uart_reg(port, MODEM_STATUS_REGISTER, &msr);
1655 status = mos7840_get_uart_reg(port, MODEM_CONTROL_REGISTER, &mcr);
1656 result = ((mcr & MCR_DTR) ? TIOCM_DTR : 0)
1657 | ((mcr & MCR_RTS) ? TIOCM_RTS : 0)
1658 | ((mcr & MCR_LOOPBACK) ? TIOCM_LOOP : 0)
1659 | ((msr & MOS7840_MSR_CTS) ? TIOCM_CTS : 0)
1660 | ((msr & MOS7840_MSR_CD) ? TIOCM_CAR : 0)
1661 | ((msr & MOS7840_MSR_RI) ? TIOCM_RI : 0)
1662 | ((msr & MOS7840_MSR_DSR) ? TIOCM_DSR : 0);
1663
1664 dbg("%s - 0x%04X", __func__, result);
1665
1666 return result;
1667 }
1668
1669 static int mos7840_tiocmset(struct tty_struct *tty, struct file *file,
1670 unsigned int set, unsigned int clear)
1671 {
1672 struct usb_serial_port *port = tty->driver_data;
1673 struct moschip_port *mos7840_port;
1674 unsigned int mcr;
1675 int status;
1676
1677 dbg("%s - port %d", __func__, port->number);
1678
1679 mos7840_port = mos7840_get_port_private(port);
1680
1681 if (mos7840_port == NULL)
1682 return -ENODEV;
1683
1684 /* FIXME: What locks the port registers ? */
1685 mcr = mos7840_port->shadowMCR;
1686 if (clear & TIOCM_RTS)
1687 mcr &= ~MCR_RTS;
1688 if (clear & TIOCM_DTR)
1689 mcr &= ~MCR_DTR;
1690 if (clear & TIOCM_LOOP)
1691 mcr &= ~MCR_LOOPBACK;
1692
1693 if (set & TIOCM_RTS)
1694 mcr |= MCR_RTS;
1695 if (set & TIOCM_DTR)
1696 mcr |= MCR_DTR;
1697 if (set & TIOCM_LOOP)
1698 mcr |= MCR_LOOPBACK;
1699
1700 mos7840_port->shadowMCR = mcr;
1701
1702 status = mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER, mcr);
1703 if (status < 0) {
1704 dbg("setting MODEM_CONTROL_REGISTER Failed");
1705 return status;
1706 }
1707
1708 return 0;
1709 }
1710
1711 /*****************************************************************************
1712 * mos7840_calc_baud_rate_divisor
1713 * this function calculates the proper baud rate divisor for the specified
1714 * baud rate.
1715 *****************************************************************************/
1716 static int mos7840_calc_baud_rate_divisor(int baudRate, int *divisor,
1717 __u16 *clk_sel_val)
1718 {
1719
1720 dbg("%s - %d", __func__, baudRate);
1721
1722 if (baudRate <= 115200) {
1723 *divisor = 115200 / baudRate;
1724 *clk_sel_val = 0x0;
1725 }
1726 if ((baudRate > 115200) && (baudRate <= 230400)) {
1727 *divisor = 230400 / baudRate;
1728 *clk_sel_val = 0x10;
1729 } else if ((baudRate > 230400) && (baudRate <= 403200)) {
1730 *divisor = 403200 / baudRate;
1731 *clk_sel_val = 0x20;
1732 } else if ((baudRate > 403200) && (baudRate <= 460800)) {
1733 *divisor = 460800 / baudRate;
1734 *clk_sel_val = 0x30;
1735 } else if ((baudRate > 460800) && (baudRate <= 806400)) {
1736 *divisor = 806400 / baudRate;
1737 *clk_sel_val = 0x40;
1738 } else if ((baudRate > 806400) && (baudRate <= 921600)) {
1739 *divisor = 921600 / baudRate;
1740 *clk_sel_val = 0x50;
1741 } else if ((baudRate > 921600) && (baudRate <= 1572864)) {
1742 *divisor = 1572864 / baudRate;
1743 *clk_sel_val = 0x60;
1744 } else if ((baudRate > 1572864) && (baudRate <= 3145728)) {
1745 *divisor = 3145728 / baudRate;
1746 *clk_sel_val = 0x70;
1747 }
1748 return 0;
1749
1750 #ifdef NOTMCS7840
1751
1752 for (i = 0; i < ARRAY_SIZE(mos7840_divisor_table); i++) {
1753 if (mos7840_divisor_table[i].BaudRate == baudrate) {
1754 *divisor = mos7840_divisor_table[i].Divisor;
1755 return 0;
1756 }
1757 }
1758
1759 /* After trying for all the standard baud rates *
1760 * Try calculating the divisor for this baud rate */
1761
1762 if (baudrate > 75 && baudrate < 230400) {
1763 /* get the divisor */
1764 custom = (__u16) (230400L / baudrate);
1765
1766 /* Check for round off */
1767 round1 = (__u16) (2304000L / baudrate);
1768 round = (__u16) (round1 - (custom * 10));
1769 if (round > 4)
1770 custom++;
1771 *divisor = custom;
1772
1773 dbg(" Baud %d = %d", baudrate, custom);
1774 return 0;
1775 }
1776
1777 dbg("%s", " Baud calculation Failed...");
1778 return -1;
1779 #endif
1780 }
1781
1782 /*****************************************************************************
1783 * mos7840_send_cmd_write_baud_rate
1784 * this function sends the proper command to change the baud rate of the
1785 * specified port.
1786 *****************************************************************************/
1787
1788 static int mos7840_send_cmd_write_baud_rate(struct moschip_port *mos7840_port,
1789 int baudRate)
1790 {
1791 int divisor = 0;
1792 int status;
1793 __u16 Data;
1794 unsigned char number;
1795 __u16 clk_sel_val;
1796 struct usb_serial_port *port;
1797
1798 if (mos7840_port == NULL)
1799 return -1;
1800
1801 port = (struct usb_serial_port *)mos7840_port->port;
1802 if (mos7840_port_paranoia_check(port, __func__)) {
1803 dbg("%s", "Invalid port");
1804 return -1;
1805 }
1806
1807 if (mos7840_serial_paranoia_check(port->serial, __func__)) {
1808 dbg("%s", "Invalid Serial");
1809 return -1;
1810 }
1811
1812 dbg("%s", "Entering ..........");
1813
1814 number = mos7840_port->port->number - mos7840_port->port->serial->minor;
1815
1816 dbg("%s - port = %d, baud = %d", __func__,
1817 mos7840_port->port->number, baudRate);
1818 /* reset clk_uart_sel in spregOffset */
1819 if (baudRate > 115200) {
1820 #ifdef HW_flow_control
1821 /* NOTE: need to see the pther register to modify */
1822 /* setting h/w flow control bit to 1 */
1823 Data = 0x2b;
1824 mos7840_port->shadowMCR = Data;
1825 status = mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER,
1826 Data);
1827 if (status < 0) {
1828 dbg("Writing spreg failed in set_serial_baud");
1829 return -1;
1830 }
1831 #endif
1832
1833 } else {
1834 #ifdef HW_flow_control
1835 / *setting h/w flow control bit to 0 */
1836 Data = 0xb;
1837 mos7840_port->shadowMCR = Data;
1838 status = mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER,
1839 Data);
1840 if (status < 0) {
1841 dbg("Writing spreg failed in set_serial_baud");
1842 return -1;
1843 }
1844 #endif
1845
1846 }
1847
1848 if (1) { /* baudRate <= 115200) */
1849 clk_sel_val = 0x0;
1850 Data = 0x0;
1851 status = mos7840_calc_baud_rate_divisor(baudRate, &divisor,
1852 &clk_sel_val);
1853 status = mos7840_get_reg_sync(port, mos7840_port->SpRegOffset,
1854 &Data);
1855 if (status < 0) {
1856 dbg("reading spreg failed in set_serial_baud");
1857 return -1;
1858 }
1859 Data = (Data & 0x8f) | clk_sel_val;
1860 status = mos7840_set_reg_sync(port, mos7840_port->SpRegOffset,
1861 Data);
1862 if (status < 0) {
1863 dbg("Writing spreg failed in set_serial_baud");
1864 return -1;
1865 }
1866 /* Calculate the Divisor */
1867
1868 if (status) {
1869 dev_err(&port->dev, "%s - bad baud rate\n", __func__);
1870 return status;
1871 }
1872 /* Enable access to divisor latch */
1873 Data = mos7840_port->shadowLCR | SERIAL_LCR_DLAB;
1874 mos7840_port->shadowLCR = Data;
1875 mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data);
1876
1877 /* Write the divisor */
1878 Data = (unsigned char)(divisor & 0xff);
1879 dbg("set_serial_baud Value to write DLL is %x", Data);
1880 mos7840_set_uart_reg(port, DIVISOR_LATCH_LSB, Data);
1881
1882 Data = (unsigned char)((divisor & 0xff00) >> 8);
1883 dbg("set_serial_baud Value to write DLM is %x", Data);
1884 mos7840_set_uart_reg(port, DIVISOR_LATCH_MSB, Data);
1885
1886 /* Disable access to divisor latch */
1887 Data = mos7840_port->shadowLCR & ~SERIAL_LCR_DLAB;
1888 mos7840_port->shadowLCR = Data;
1889 mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data);
1890
1891 }
1892 return status;
1893 }
1894
1895 /*****************************************************************************
1896 * mos7840_change_port_settings
1897 * This routine is called to set the UART on the device to match
1898 * the specified new settings.
1899 *****************************************************************************/
1900
1901 static void mos7840_change_port_settings(struct tty_struct *tty,
1902 struct moschip_port *mos7840_port, struct ktermios *old_termios)
1903 {
1904 int baud;
1905 unsigned cflag;
1906 unsigned iflag;
1907 __u8 lData;
1908 __u8 lParity;
1909 __u8 lStop;
1910 int status;
1911 __u16 Data;
1912 struct usb_serial_port *port;
1913 struct usb_serial *serial;
1914
1915 if (mos7840_port == NULL)
1916 return;
1917
1918 port = (struct usb_serial_port *)mos7840_port->port;
1919
1920 if (mos7840_port_paranoia_check(port, __func__)) {
1921 dbg("%s", "Invalid port");
1922 return;
1923 }
1924
1925 if (mos7840_serial_paranoia_check(port->serial, __func__)) {
1926 dbg("%s", "Invalid Serial");
1927 return;
1928 }
1929
1930 serial = port->serial;
1931
1932 dbg("%s - port %d", __func__, mos7840_port->port->number);
1933
1934 if (!mos7840_port->open) {
1935 dbg("%s - port not opened", __func__);
1936 return;
1937 }
1938
1939 dbg("%s", "Entering ..........");
1940
1941 lData = LCR_BITS_8;
1942 lStop = LCR_STOP_1;
1943 lParity = LCR_PAR_NONE;
1944
1945 cflag = tty->termios->c_cflag;
1946 iflag = tty->termios->c_iflag;
1947
1948 /* Change the number of bits */
1949 if (cflag & CSIZE) {
1950 switch (cflag & CSIZE) {
1951 case CS5:
1952 lData = LCR_BITS_5;
1953 break;
1954
1955 case CS6:
1956 lData = LCR_BITS_6;
1957 break;
1958
1959 case CS7:
1960 lData = LCR_BITS_7;
1961 break;
1962 default:
1963 case CS8:
1964 lData = LCR_BITS_8;
1965 break;
1966 }
1967 }
1968 /* Change the Parity bit */
1969 if (cflag & PARENB) {
1970 if (cflag & PARODD) {
1971 lParity = LCR_PAR_ODD;
1972 dbg("%s - parity = odd", __func__);
1973 } else {
1974 lParity = LCR_PAR_EVEN;
1975 dbg("%s - parity = even", __func__);
1976 }
1977
1978 } else {
1979 dbg("%s - parity = none", __func__);
1980 }
1981
1982 if (cflag & CMSPAR)
1983 lParity = lParity | 0x20;
1984
1985 /* Change the Stop bit */
1986 if (cflag & CSTOPB) {
1987 lStop = LCR_STOP_2;
1988 dbg("%s - stop bits = 2", __func__);
1989 } else {
1990 lStop = LCR_STOP_1;
1991 dbg("%s - stop bits = 1", __func__);
1992 }
1993
1994 /* Update the LCR with the correct value */
1995 mos7840_port->shadowLCR &=
1996 ~(LCR_BITS_MASK | LCR_STOP_MASK | LCR_PAR_MASK);
1997 mos7840_port->shadowLCR |= (lData | lParity | lStop);
1998
1999 dbg("mos7840_change_port_settings mos7840_port->shadowLCR is %x",
2000 mos7840_port->shadowLCR);
2001 /* Disable Interrupts */
2002 Data = 0x00;
2003 mos7840_set_uart_reg(port, INTERRUPT_ENABLE_REGISTER, Data);
2004
2005 Data = 0x00;
2006 mos7840_set_uart_reg(port, FIFO_CONTROL_REGISTER, Data);
2007
2008 Data = 0xcf;
2009 mos7840_set_uart_reg(port, FIFO_CONTROL_REGISTER, Data);
2010
2011 /* Send the updated LCR value to the mos7840 */
2012 Data = mos7840_port->shadowLCR;
2013
2014 mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data);
2015
2016 Data = 0x00b;
2017 mos7840_port->shadowMCR = Data;
2018 mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER, Data);
2019 Data = 0x00b;
2020 mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER, Data);
2021
2022 /* set up the MCR register and send it to the mos7840 */
2023
2024 mos7840_port->shadowMCR = MCR_MASTER_IE;
2025 if (cflag & CBAUD)
2026 mos7840_port->shadowMCR |= (MCR_DTR | MCR_RTS);
2027
2028 if (cflag & CRTSCTS)
2029 mos7840_port->shadowMCR |= (MCR_XON_ANY);
2030 else
2031 mos7840_port->shadowMCR &= ~(MCR_XON_ANY);
2032
2033 Data = mos7840_port->shadowMCR;
2034 mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER, Data);
2035
2036 /* Determine divisor based on baud rate */
2037 baud = tty_get_baud_rate(tty);
2038
2039 if (!baud) {
2040 /* pick a default, any default... */
2041 dbg("%s", "Picked default baud...");
2042 baud = 9600;
2043 }
2044
2045 dbg("%s - baud rate = %d", __func__, baud);
2046 status = mos7840_send_cmd_write_baud_rate(mos7840_port, baud);
2047
2048 /* Enable Interrupts */
2049 Data = 0x0c;
2050 mos7840_set_uart_reg(port, INTERRUPT_ENABLE_REGISTER, Data);
2051
2052 if (mos7840_port->read_urb_busy == false) {
2053 mos7840_port->read_urb->dev = serial->dev;
2054 mos7840_port->read_urb_busy = true;
2055 status = usb_submit_urb(mos7840_port->read_urb, GFP_ATOMIC);
2056 if (status) {
2057 dbg("usb_submit_urb(read bulk) failed, status = %d",
2058 status);
2059 mos7840_port->read_urb_busy = false;
2060 }
2061 }
2062 wake_up(&mos7840_port->delta_msr_wait);
2063 mos7840_port->delta_msr_cond = 1;
2064 dbg("mos7840_change_port_settings mos7840_port->shadowLCR is End %x",
2065 mos7840_port->shadowLCR);
2066
2067 return;
2068 }
2069
2070 /*****************************************************************************
2071 * mos7840_set_termios
2072 * this function is called by the tty driver when it wants to change
2073 * the termios structure
2074 *****************************************************************************/
2075
2076 static void mos7840_set_termios(struct tty_struct *tty,
2077 struct usb_serial_port *port,
2078 struct ktermios *old_termios)
2079 {
2080 int status;
2081 unsigned int cflag;
2082 struct usb_serial *serial;
2083 struct moschip_port *mos7840_port;
2084 dbg("mos7840_set_termios: START");
2085 if (mos7840_port_paranoia_check(port, __func__)) {
2086 dbg("%s", "Invalid port");
2087 return;
2088 }
2089
2090 serial = port->serial;
2091
2092 if (mos7840_serial_paranoia_check(serial, __func__)) {
2093 dbg("%s", "Invalid Serial");
2094 return;
2095 }
2096
2097 mos7840_port = mos7840_get_port_private(port);
2098
2099 if (mos7840_port == NULL)
2100 return;
2101
2102 if (!mos7840_port->open) {
2103 dbg("%s - port not opened", __func__);
2104 return;
2105 }
2106
2107 dbg("%s", "setting termios - ");
2108
2109 cflag = tty->termios->c_cflag;
2110
2111 dbg("%s - clfag %08x iflag %08x", __func__,
2112 tty->termios->c_cflag, RELEVANT_IFLAG(tty->termios->c_iflag));
2113 dbg("%s - old clfag %08x old iflag %08x", __func__,
2114 old_termios->c_cflag, RELEVANT_IFLAG(old_termios->c_iflag));
2115 dbg("%s - port %d", __func__, port->number);
2116
2117 /* change the port settings to the new ones specified */
2118
2119 mos7840_change_port_settings(tty, mos7840_port, old_termios);
2120
2121 if (!mos7840_port->read_urb) {
2122 dbg("%s", "URB KILLED !!!!!");
2123 return;
2124 }
2125
2126 if (mos7840_port->read_urb_busy == false) {
2127 mos7840_port->read_urb->dev = serial->dev;
2128 mos7840_port->read_urb_busy = true;
2129 status = usb_submit_urb(mos7840_port->read_urb, GFP_ATOMIC);
2130 if (status) {
2131 dbg("usb_submit_urb(read bulk) failed, status = %d",
2132 status);
2133 mos7840_port->read_urb_busy = false;
2134 }
2135 }
2136 return;
2137 }
2138
2139 /*****************************************************************************
2140 * mos7840_get_lsr_info - get line status register info
2141 *
2142 * Purpose: Let user call ioctl() to get info when the UART physically
2143 * is emptied. On bus types like RS485, the transmitter must
2144 * release the bus after transmitting. This must be done when
2145 * the transmit shift register is empty, not be done when the
2146 * transmit holding register is empty. This functionality
2147 * allows an RS485 driver to be written in user space.
2148 *****************************************************************************/
2149
2150 static int mos7840_get_lsr_info(struct tty_struct *tty,
2151 unsigned int __user *value)
2152 {
2153 int count;
2154 unsigned int result = 0;
2155
2156 count = mos7840_chars_in_buffer(tty);
2157 if (count == 0) {
2158 dbg("%s -- Empty", __func__);
2159 result = TIOCSER_TEMT;
2160 }
2161
2162 if (copy_to_user(value, &result, sizeof(int)))
2163 return -EFAULT;
2164 return 0;
2165 }
2166
2167 /*****************************************************************************
2168 * mos7840_get_serial_info
2169 * function to get information about serial port
2170 *****************************************************************************/
2171
2172 static int mos7840_get_serial_info(struct moschip_port *mos7840_port,
2173 struct serial_struct __user *retinfo)
2174 {
2175 struct serial_struct tmp;
2176
2177 if (mos7840_port == NULL)
2178 return -1;
2179
2180 if (!retinfo)
2181 return -EFAULT;
2182
2183 memset(&tmp, 0, sizeof(tmp));
2184
2185 tmp.type = PORT_16550A;
2186 tmp.line = mos7840_port->port->serial->minor;
2187 tmp.port = mos7840_port->port->number;
2188 tmp.irq = 0;
2189 tmp.flags = ASYNC_SKIP_TEST | ASYNC_AUTO_IRQ;
2190 tmp.xmit_fifo_size = NUM_URBS * URB_TRANSFER_BUFFER_SIZE;
2191 tmp.baud_base = 9600;
2192 tmp.close_delay = 5 * HZ;
2193 tmp.closing_wait = 30 * HZ;
2194
2195 if (copy_to_user(retinfo, &tmp, sizeof(*retinfo)))
2196 return -EFAULT;
2197 return 0;
2198 }
2199
2200 /*****************************************************************************
2201 * SerialIoctl
2202 * this function handles any ioctl calls to the driver
2203 *****************************************************************************/
2204
2205 static int mos7840_ioctl(struct tty_struct *tty, struct file *file,
2206 unsigned int cmd, unsigned long arg)
2207 {
2208 struct usb_serial_port *port = tty->driver_data;
2209 void __user *argp = (void __user *)arg;
2210 struct moschip_port *mos7840_port;
2211
2212 struct async_icount cnow;
2213 struct async_icount cprev;
2214 struct serial_icounter_struct icount;
2215
2216 if (mos7840_port_paranoia_check(port, __func__)) {
2217 dbg("%s", "Invalid port");
2218 return -1;
2219 }
2220
2221 mos7840_port = mos7840_get_port_private(port);
2222
2223 if (mos7840_port == NULL)
2224 return -1;
2225
2226 dbg("%s - port %d, cmd = 0x%x", __func__, port->number, cmd);
2227
2228 switch (cmd) {
2229 /* return number of bytes available */
2230
2231 case TIOCSERGETLSR:
2232 dbg("%s (%d) TIOCSERGETLSR", __func__, port->number);
2233 return mos7840_get_lsr_info(tty, argp);
2234 return 0;
2235
2236 case TIOCGSERIAL:
2237 dbg("%s (%d) TIOCGSERIAL", __func__, port->number);
2238 return mos7840_get_serial_info(mos7840_port, argp);
2239
2240 case TIOCSSERIAL:
2241 dbg("%s (%d) TIOCSSERIAL", __func__, port->number);
2242 break;
2243
2244 case TIOCMIWAIT:
2245 dbg("%s (%d) TIOCMIWAIT", __func__, port->number);
2246 cprev = mos7840_port->icount;
2247 while (1) {
2248 /* interruptible_sleep_on(&mos7840_port->delta_msr_wait); */
2249 mos7840_port->delta_msr_cond = 0;
2250 wait_event_interruptible(mos7840_port->delta_msr_wait,
2251 (mos7840_port->
2252 delta_msr_cond == 1));
2253
2254 /* see if a signal did it */
2255 if (signal_pending(current))
2256 return -ERESTARTSYS;
2257 cnow = mos7840_port->icount;
2258 smp_rmb();
2259 if (cnow.rng == cprev.rng && cnow.dsr == cprev.dsr &&
2260 cnow.dcd == cprev.dcd && cnow.cts == cprev.cts)
2261 return -EIO; /* no change => error */
2262 if (((arg & TIOCM_RNG) && (cnow.rng != cprev.rng)) ||
2263 ((arg & TIOCM_DSR) && (cnow.dsr != cprev.dsr)) ||
2264 ((arg & TIOCM_CD) && (cnow.dcd != cprev.dcd)) ||
2265 ((arg & TIOCM_CTS) && (cnow.cts != cprev.cts))) {
2266 return 0;
2267 }
2268 cprev = cnow;
2269 }
2270 /* NOTREACHED */
2271 break;
2272
2273 case TIOCGICOUNT:
2274 cnow = mos7840_port->icount;
2275 smp_rmb();
2276 icount.cts = cnow.cts;
2277 icount.dsr = cnow.dsr;
2278 icount.rng = cnow.rng;
2279 icount.dcd = cnow.dcd;
2280 icount.rx = cnow.rx;
2281 icount.tx = cnow.tx;
2282 icount.frame = cnow.frame;
2283 icount.overrun = cnow.overrun;
2284 icount.parity = cnow.parity;
2285 icount.brk = cnow.brk;
2286 icount.buf_overrun = cnow.buf_overrun;
2287
2288 dbg("%s (%d) TIOCGICOUNT RX=%d, TX=%d", __func__,
2289 port->number, icount.rx, icount.tx);
2290 if (copy_to_user(argp, &icount, sizeof(icount)))
2291 return -EFAULT;
2292 return 0;
2293 default:
2294 break;
2295 }
2296 return -ENOIOCTLCMD;
2297 }
2298
2299 static int mos7840_calc_num_ports(struct usb_serial *serial)
2300 {
2301 int mos7840_num_ports = 0;
2302
2303 dbg("numberofendpoints: cur %d, alt %d",
2304 (int)serial->interface->cur_altsetting->desc.bNumEndpoints,
2305 (int)serial->interface->altsetting->desc.bNumEndpoints);
2306 if (serial->interface->cur_altsetting->desc.bNumEndpoints == 5) {
2307 mos7840_num_ports = serial->num_ports = 2;
2308 } else if (serial->interface->cur_altsetting->desc.bNumEndpoints == 9) {
2309 serial->num_bulk_in = 4;
2310 serial->num_bulk_out = 4;
2311 mos7840_num_ports = serial->num_ports = 4;
2312 }
2313 dbg ("mos7840_num_ports = %d", mos7840_num_ports);
2314 return mos7840_num_ports;
2315 }
2316
2317 /****************************************************************************
2318 * mos7840_startup
2319 ****************************************************************************/
2320
2321 static int mos7840_startup(struct usb_serial *serial)
2322 {
2323 struct moschip_port *mos7840_port;
2324 struct usb_device *dev;
2325 int i, status;
2326
2327 __u16 Data;
2328 dbg("%s", "mos7840_startup :Entering..........");
2329
2330 if (!serial) {
2331 dbg("%s", "Invalid Handler");
2332 return -1;
2333 }
2334
2335 dev = serial->dev;
2336
2337 dbg("%s", "Entering...");
2338 dbg ("mos7840_startup: serial = %p", serial);
2339
2340 /* we set up the pointers to the endpoints in the mos7840_open *
2341 * function, as the structures aren't created yet. */
2342
2343 /* set up port private structures */
2344 for (i = 0; i < serial->num_ports; ++i) {
2345 dbg ("mos7840_startup: configuring port %d............", i);
2346 mos7840_port = kzalloc(sizeof(struct moschip_port), GFP_KERNEL);
2347 if (mos7840_port == NULL) {
2348 dev_err(&dev->dev, "%s - Out of memory\n", __func__);
2349 status = -ENOMEM;
2350 i--; /* don't follow NULL pointer cleaning up */
2351 goto error;
2352 }
2353
2354 /* Initialize all port interrupt end point to port 0 int
2355 * endpoint. Our device has only one interrupt end point
2356 * common to all port */
2357
2358 mos7840_port->port = serial->port[i];
2359 mos7840_set_port_private(serial->port[i], mos7840_port);
2360 spin_lock_init(&mos7840_port->pool_lock);
2361
2362 /* minor is not initialised until later by
2363 * usb-serial.c:get_free_serial() and cannot therefore be used
2364 * to index device instances */
2365 mos7840_port->port_num = i + 1;
2366 dbg ("serial->port[i]->number = %d", serial->port[i]->number);
2367 dbg ("serial->port[i]->serial->minor = %d", serial->port[i]->serial->minor);
2368 dbg ("mos7840_port->port_num = %d", mos7840_port->port_num);
2369 dbg ("serial->minor = %d", serial->minor);
2370
2371 if (mos7840_port->port_num == 1) {
2372 mos7840_port->SpRegOffset = 0x0;
2373 mos7840_port->ControlRegOffset = 0x1;
2374 mos7840_port->DcrRegOffset = 0x4;
2375 } else if ((mos7840_port->port_num == 2)
2376 && (serial->num_ports == 4)) {
2377 mos7840_port->SpRegOffset = 0x8;
2378 mos7840_port->ControlRegOffset = 0x9;
2379 mos7840_port->DcrRegOffset = 0x16;
2380 } else if ((mos7840_port->port_num == 2)
2381 && (serial->num_ports == 2)) {
2382 mos7840_port->SpRegOffset = 0xa;
2383 mos7840_port->ControlRegOffset = 0xb;
2384 mos7840_port->DcrRegOffset = 0x19;
2385 } else if ((mos7840_port->port_num == 3)
2386 && (serial->num_ports == 4)) {
2387 mos7840_port->SpRegOffset = 0xa;
2388 mos7840_port->ControlRegOffset = 0xb;
2389 mos7840_port->DcrRegOffset = 0x19;
2390 } else if ((mos7840_port->port_num == 4)
2391 && (serial->num_ports == 4)) {
2392 mos7840_port->SpRegOffset = 0xc;
2393 mos7840_port->ControlRegOffset = 0xd;
2394 mos7840_port->DcrRegOffset = 0x1c;
2395 }
2396 mos7840_dump_serial_port(mos7840_port);
2397 mos7840_set_port_private(serial->port[i], mos7840_port);
2398
2399 /* enable rx_disable bit in control register */
2400 status = mos7840_get_reg_sync(serial->port[i],
2401 mos7840_port->ControlRegOffset, &Data);
2402 if (status < 0) {
2403 dbg("Reading ControlReg failed status-0x%x", status);
2404 break;
2405 } else
2406 dbg("ControlReg Reading success val is %x, status%d",
2407 Data, status);
2408 Data |= 0x08; /* setting driver done bit */
2409 Data |= 0x04; /* sp1_bit to have cts change reflect in
2410 modem status reg */
2411
2412 /* Data |= 0x20; //rx_disable bit */
2413 status = mos7840_set_reg_sync(serial->port[i],
2414 mos7840_port->ControlRegOffset, Data);
2415 if (status < 0) {
2416 dbg("Writing ControlReg failed(rx_disable) status-0x%x", status);
2417 break;
2418 } else
2419 dbg("ControlReg Writing success(rx_disable) status%d",
2420 status);
2421
2422 /* Write default values in DCR (i.e 0x01 in DCR0, 0x05 in DCR2
2423 and 0x24 in DCR3 */
2424 Data = 0x01;
2425 status = mos7840_set_reg_sync(serial->port[i],
2426 (__u16) (mos7840_port->DcrRegOffset + 0), Data);
2427 if (status < 0) {
2428 dbg("Writing DCR0 failed status-0x%x", status);
2429 break;
2430 } else
2431 dbg("DCR0 Writing success status%d", status);
2432
2433 Data = 0x05;
2434 status = mos7840_set_reg_sync(serial->port[i],
2435 (__u16) (mos7840_port->DcrRegOffset + 1), Data);
2436 if (status < 0) {
2437 dbg("Writing DCR1 failed status-0x%x", status);
2438 break;
2439 } else
2440 dbg("DCR1 Writing success status%d", status);
2441
2442 Data = 0x24;
2443 status = mos7840_set_reg_sync(serial->port[i],
2444 (__u16) (mos7840_port->DcrRegOffset + 2), Data);
2445 if (status < 0) {
2446 dbg("Writing DCR2 failed status-0x%x", status);
2447 break;
2448 } else
2449 dbg("DCR2 Writing success status%d", status);
2450
2451 /* write values in clkstart0x0 and clkmulti 0x20 */
2452 Data = 0x0;
2453 status = mos7840_set_reg_sync(serial->port[i],
2454 CLK_START_VALUE_REGISTER, Data);
2455 if (status < 0) {
2456 dbg("Writing CLK_START_VALUE_REGISTER failed status-0x%x", status);
2457 break;
2458 } else
2459 dbg("CLK_START_VALUE_REGISTER Writing success status%d", status);
2460
2461 Data = 0x20;
2462 status = mos7840_set_reg_sync(serial->port[i],
2463 CLK_MULTI_REGISTER, Data);
2464 if (status < 0) {
2465 dbg("Writing CLK_MULTI_REGISTER failed status-0x%x",
2466 status);
2467 goto error;
2468 } else
2469 dbg("CLK_MULTI_REGISTER Writing success status%d",
2470 status);
2471
2472 /* write value 0x0 to scratchpad register */
2473 Data = 0x00;
2474 status = mos7840_set_uart_reg(serial->port[i],
2475 SCRATCH_PAD_REGISTER, Data);
2476 if (status < 0) {
2477 dbg("Writing SCRATCH_PAD_REGISTER failed status-0x%x",
2478 status);
2479 break;
2480 } else
2481 dbg("SCRATCH_PAD_REGISTER Writing success status%d",
2482 status);
2483
2484 /* Zero Length flag register */
2485 if ((mos7840_port->port_num != 1)
2486 && (serial->num_ports == 2)) {
2487
2488 Data = 0xff;
2489 status = mos7840_set_reg_sync(serial->port[i],
2490 (__u16) (ZLP_REG1 +
2491 ((__u16)mos7840_port->port_num)), Data);
2492 dbg("ZLIP offset %x",
2493 (__u16) (ZLP_REG1 +
2494 ((__u16) mos7840_port->port_num)));
2495 if (status < 0) {
2496 dbg("Writing ZLP_REG%d failed status-0x%x",
2497 i + 2, status);
2498 break;
2499 } else
2500 dbg("ZLP_REG%d Writing success status%d",
2501 i + 2, status);
2502 } else {
2503 Data = 0xff;
2504 status = mos7840_set_reg_sync(serial->port[i],
2505 (__u16) (ZLP_REG1 +
2506 ((__u16)mos7840_port->port_num) - 0x1), Data);
2507 dbg("ZLIP offset %x",
2508 (__u16) (ZLP_REG1 +
2509 ((__u16) mos7840_port->port_num) - 0x1));
2510 if (status < 0) {
2511 dbg("Writing ZLP_REG%d failed status-0x%x",
2512 i + 1, status);
2513 break;
2514 } else
2515 dbg("ZLP_REG%d Writing success status%d",
2516 i + 1, status);
2517
2518 }
2519 mos7840_port->control_urb = usb_alloc_urb(0, GFP_KERNEL);
2520 mos7840_port->ctrl_buf = kmalloc(16, GFP_KERNEL);
2521 mos7840_port->dr = kmalloc(sizeof(struct usb_ctrlrequest),
2522 GFP_KERNEL);
2523 if (!mos7840_port->control_urb || !mos7840_port->ctrl_buf ||
2524 !mos7840_port->dr) {
2525 status = -ENOMEM;
2526 goto error;
2527 }
2528 }
2529 dbg ("mos7840_startup: all ports configured...........");
2530
2531 /* Zero Length flag enable */
2532 Data = 0x0f;
2533 status = mos7840_set_reg_sync(serial->port[0], ZLP_REG5, Data);
2534 if (status < 0) {
2535 dbg("Writing ZLP_REG5 failed status-0x%x", status);
2536 goto error;
2537 } else
2538 dbg("ZLP_REG5 Writing success status%d", status);
2539
2540 /* setting configuration feature to one */
2541 usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0),
2542 (__u8) 0x03, 0x00, 0x01, 0x00, NULL, 0x00, 5 * HZ);
2543 return 0;
2544 error:
2545 for (/* nothing */; i >= 0; i--) {
2546 mos7840_port = mos7840_get_port_private(serial->port[i]);
2547
2548 kfree(mos7840_port->dr);
2549 kfree(mos7840_port->ctrl_buf);
2550 usb_free_urb(mos7840_port->control_urb);
2551 kfree(mos7840_port);
2552 serial->port[i] = NULL;
2553 }
2554 return status;
2555 }
2556
2557 /****************************************************************************
2558 * mos7840_disconnect
2559 * This function is called whenever the device is removed from the usb bus.
2560 ****************************************************************************/
2561
2562 static void mos7840_disconnect(struct usb_serial *serial)
2563 {
2564 int i;
2565 unsigned long flags;
2566 struct moschip_port *mos7840_port;
2567 dbg("%s", " disconnect :entering..........");
2568
2569 if (!serial) {
2570 dbg("%s", "Invalid Handler");
2571 return;
2572 }
2573
2574 /* check for the ports to be closed,close the ports and disconnect */
2575
2576 /* free private structure allocated for serial port *
2577 * stop reads and writes on all ports */
2578
2579 for (i = 0; i < serial->num_ports; ++i) {
2580 mos7840_port = mos7840_get_port_private(serial->port[i]);
2581 dbg ("mos7840_port %d = %p", i, mos7840_port);
2582 if (mos7840_port) {
2583 spin_lock_irqsave(&mos7840_port->pool_lock, flags);
2584 mos7840_port->zombie = 1;
2585 spin_unlock_irqrestore(&mos7840_port->pool_lock, flags);
2586 usb_kill_urb(mos7840_port->control_urb);
2587 }
2588 }
2589
2590 dbg("%s", "Thank u :: ");
2591
2592 }
2593
2594 /****************************************************************************
2595 * mos7840_release
2596 * This function is called when the usb_serial structure is freed.
2597 ****************************************************************************/
2598
2599 static void mos7840_release(struct usb_serial *serial)
2600 {
2601 int i;
2602 struct moschip_port *mos7840_port;
2603 dbg("%s", " release :entering..........");
2604
2605 if (!serial) {
2606 dbg("%s", "Invalid Handler");
2607 return;
2608 }
2609
2610 /* check for the ports to be closed,close the ports and disconnect */
2611
2612 /* free private structure allocated for serial port *
2613 * stop reads and writes on all ports */
2614
2615 for (i = 0; i < serial->num_ports; ++i) {
2616 mos7840_port = mos7840_get_port_private(serial->port[i]);
2617 dbg("mos7840_port %d = %p", i, mos7840_port);
2618 if (mos7840_port) {
2619 kfree(mos7840_port->ctrl_buf);
2620 kfree(mos7840_port->dr);
2621 kfree(mos7840_port);
2622 }
2623 }
2624
2625 dbg("%s", "Thank u :: ");
2626
2627 }
2628
2629 static struct usb_driver io_driver = {
2630 .name = "mos7840",
2631 .probe = usb_serial_probe,
2632 .disconnect = usb_serial_disconnect,
2633 .id_table = moschip_id_table_combined,
2634 .no_dynamic_id = 1,
2635 };
2636
2637 static struct usb_serial_driver moschip7840_4port_device = {
2638 .driver = {
2639 .owner = THIS_MODULE,
2640 .name = "mos7840",
2641 },
2642 .description = DRIVER_DESC,
2643 .usb_driver = &io_driver,
2644 .id_table = moschip_port_id_table,
2645 .num_ports = 4,
2646 .open = mos7840_open,
2647 .close = mos7840_close,
2648 .write = mos7840_write,
2649 .write_room = mos7840_write_room,
2650 .chars_in_buffer = mos7840_chars_in_buffer,
2651 .throttle = mos7840_throttle,
2652 .unthrottle = mos7840_unthrottle,
2653 .calc_num_ports = mos7840_calc_num_ports,
2654 #ifdef MCSSerialProbe
2655 .probe = mos7840_serial_probe,
2656 #endif
2657 .ioctl = mos7840_ioctl,
2658 .set_termios = mos7840_set_termios,
2659 .break_ctl = mos7840_break,
2660 .tiocmget = mos7840_tiocmget,
2661 .tiocmset = mos7840_tiocmset,
2662 .attach = mos7840_startup,
2663 .disconnect = mos7840_disconnect,
2664 .release = mos7840_release,
2665 .read_bulk_callback = mos7840_bulk_in_callback,
2666 .read_int_callback = mos7840_interrupt_callback,
2667 };
2668
2669 /****************************************************************************
2670 * moschip7840_init
2671 * This is called by the module subsystem, or on startup to initialize us
2672 ****************************************************************************/
2673 static int __init moschip7840_init(void)
2674 {
2675 int retval;
2676
2677 dbg("%s", " mos7840_init :entering..........");
2678
2679 /* Register with the usb serial */
2680 retval = usb_serial_register(&moschip7840_4port_device);
2681
2682 if (retval)
2683 goto failed_port_device_register;
2684
2685 dbg("%s", "Entering...");
2686 printk(KERN_INFO KBUILD_MODNAME ": " DRIVER_VERSION ":"
2687 DRIVER_DESC "\n");
2688
2689 /* Register with the usb */
2690 retval = usb_register(&io_driver);
2691 if (retval == 0) {
2692 dbg("%s", "Leaving...");
2693 return 0;
2694 }
2695 usb_serial_deregister(&moschip7840_4port_device);
2696 failed_port_device_register:
2697 return retval;
2698 }
2699
2700 /****************************************************************************
2701 * moschip7840_exit
2702 * Called when the driver is about to be unloaded.
2703 ****************************************************************************/
2704 static void __exit moschip7840_exit(void)
2705 {
2706
2707 dbg("%s", " mos7840_exit :entering..........");
2708
2709 usb_deregister(&io_driver);
2710
2711 usb_serial_deregister(&moschip7840_4port_device);
2712
2713 dbg("%s", "Entering...");
2714 }
2715
2716 module_init(moschip7840_init);
2717 module_exit(moschip7840_exit);
2718
2719 /* Module information */
2720 MODULE_DESCRIPTION(DRIVER_DESC);
2721 MODULE_LICENSE("GPL");
2722
2723 module_param(debug, bool, S_IRUGO | S_IWUSR);
2724 MODULE_PARM_DESC(debug, "Debug enabled or not");
Linux kernel - Deliverables
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