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USB: mos7840: fix DMA buffers on stack and endianess bugs
[linux-2.6/linux-acpi-2.6/ibm-acpi-2.6.git] / drivers / usb / serial / mos7840.c
blob04bef4bebc4a47311665b8f7112bb12de1dd3dea
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 u8 *buf;
287
288 buf = kmalloc(VENDOR_READ_LENGTH, GFP_KERNEL);
289 if (!buf)
290 return -ENOMEM;
291
292 ret = usb_control_msg(dev, usb_rcvctrlpipe(dev, 0), MCS_RDREQ,
293 MCS_RD_RTYPE, 0, reg, buf, VENDOR_READ_LENGTH,
294 MOS_WDR_TIMEOUT);
295 *val = buf[0];
296 dbg("mos7840_get_reg_sync offset is %x, return val %x", reg, *val);
297
298 kfree(buf);
299 return ret;
300 }
301
302 /*
303 * mos7840_set_uart_reg
304 * To set the Uart register by calling usb_fill_control_urb function by
305 * passing usb_sndctrlpipe function as parameter.
306 */
307
308 static int mos7840_set_uart_reg(struct usb_serial_port *port, __u16 reg,
309 __u16 val)
310 {
311
312 struct usb_device *dev = port->serial->dev;
313 val = val & 0x00ff;
314 /* For the UART control registers, the application number need
315 to be Or'ed */
316 if (port->serial->num_ports == 4) {
317 val |= (((__u16) port->number -
318 (__u16) (port->serial->minor)) + 1) << 8;
319 dbg("mos7840_set_uart_reg application number is %x", val);
320 } else {
321 if (((__u16) port->number - (__u16) (port->serial->minor)) == 0) {
322 val |= (((__u16) port->number -
323 (__u16) (port->serial->minor)) + 1) << 8;
324 dbg("mos7840_set_uart_reg application number is %x",
325 val);
326 } else {
327 val |=
328 (((__u16) port->number -
329 (__u16) (port->serial->minor)) + 2) << 8;
330 dbg("mos7840_set_uart_reg application number is %x",
331 val);
332 }
333 }
334 return usb_control_msg(dev, usb_sndctrlpipe(dev, 0), MCS_WRREQ,
335 MCS_WR_RTYPE, val, reg, NULL, 0,
336 MOS_WDR_TIMEOUT);
337
338 }
339
340 /*
341 * mos7840_get_uart_reg
342 * To set the Control register by calling usb_fill_control_urb function
343 * by passing usb_rcvctrlpipe function as parameter.
344 */
345 static int mos7840_get_uart_reg(struct usb_serial_port *port, __u16 reg,
346 __u16 *val)
347 {
348 struct usb_device *dev = port->serial->dev;
349 int ret = 0;
350 __u16 Wval;
351 u8 *buf;
352
353 buf = kmalloc(VENDOR_READ_LENGTH, GFP_KERNEL);
354 if (!buf)
355 return -ENOMEM;
356
357 /* dbg("application number is %4x",
358 (((__u16)port->number - (__u16)(port->serial->minor))+1)<<8); */
359 /* Wval is same as application number */
360 if (port->serial->num_ports == 4) {
361 Wval =
362 (((__u16) port->number - (__u16) (port->serial->minor)) +
363 1) << 8;
364 dbg("mos7840_get_uart_reg application number is %x", Wval);
365 } else {
366 if (((__u16) port->number - (__u16) (port->serial->minor)) == 0) {
367 Wval = (((__u16) port->number -
368 (__u16) (port->serial->minor)) + 1) << 8;
369 dbg("mos7840_get_uart_reg application number is %x",
370 Wval);
371 } else {
372 Wval = (((__u16) port->number -
373 (__u16) (port->serial->minor)) + 2) << 8;
374 dbg("mos7840_get_uart_reg application number is %x",
375 Wval);
376 }
377 }
378 ret = usb_control_msg(dev, usb_rcvctrlpipe(dev, 0), MCS_RDREQ,
379 MCS_RD_RTYPE, Wval, reg, buf, VENDOR_READ_LENGTH,
380 MOS_WDR_TIMEOUT);
381 *val = buf[0];
382
383 kfree(buf);
384 return ret;
385 }
386
387 static void mos7840_dump_serial_port(struct moschip_port *mos7840_port)
388 {
389
390 dbg("***************************************");
391 dbg("SpRegOffset is %2x", mos7840_port->SpRegOffset);
392 dbg("ControlRegOffset is %2x", mos7840_port->ControlRegOffset);
393 dbg("DCRRegOffset is %2x", mos7840_port->DcrRegOffset);
394 dbg("***************************************");
395
396 }
397
398 /************************************************************************/
399 /************************************************************************/
400 /* I N T E R F A C E F U N C T I O N S */
401 /* I N T E R F A C E F U N C T I O N S */
402 /************************************************************************/
403 /************************************************************************/
404
405 static inline void mos7840_set_port_private(struct usb_serial_port *port,
406 struct moschip_port *data)
407 {
408 usb_set_serial_port_data(port, (void *)data);
409 }
410
411 static inline struct moschip_port *mos7840_get_port_private(struct
412 usb_serial_port
413 *port)
414 {
415 return (struct moschip_port *)usb_get_serial_port_data(port);
416 }
417
418 static void mos7840_handle_new_msr(struct moschip_port *port, __u8 new_msr)
419 {
420 struct moschip_port *mos7840_port;
421 struct async_icount *icount;
422 mos7840_port = port;
423 icount = &mos7840_port->icount;
424 if (new_msr &
425 (MOS_MSR_DELTA_CTS | MOS_MSR_DELTA_DSR | MOS_MSR_DELTA_RI |
426 MOS_MSR_DELTA_CD)) {
427 icount = &mos7840_port->icount;
428
429 /* update input line counters */
430 if (new_msr & MOS_MSR_DELTA_CTS) {
431 icount->cts++;
432 smp_wmb();
433 }
434 if (new_msr & MOS_MSR_DELTA_DSR) {
435 icount->dsr++;
436 smp_wmb();
437 }
438 if (new_msr & MOS_MSR_DELTA_CD) {
439 icount->dcd++;
440 smp_wmb();
441 }
442 if (new_msr & MOS_MSR_DELTA_RI) {
443 icount->rng++;
444 smp_wmb();
445 }
446 }
447 }
448
449 static void mos7840_handle_new_lsr(struct moschip_port *port, __u8 new_lsr)
450 {
451 struct async_icount *icount;
452
453 dbg("%s - %02x", __func__, new_lsr);
454
455 if (new_lsr & SERIAL_LSR_BI) {
456 /*
457 * Parity and Framing errors only count if they
458 * occur exclusive of a break being
459 * received.
460 */
461 new_lsr &= (__u8) (SERIAL_LSR_OE | SERIAL_LSR_BI);
462 }
463
464 /* update input line counters */
465 icount = &port->icount;
466 if (new_lsr & SERIAL_LSR_BI) {
467 icount->brk++;
468 smp_wmb();
469 }
470 if (new_lsr & SERIAL_LSR_OE) {
471 icount->overrun++;
472 smp_wmb();
473 }
474 if (new_lsr & SERIAL_LSR_PE) {
475 icount->parity++;
476 smp_wmb();
477 }
478 if (new_lsr & SERIAL_LSR_FE) {
479 icount->frame++;
480 smp_wmb();
481 }
482 }
483
484 /************************************************************************/
485 /************************************************************************/
486 /* U S B C A L L B A C K F U N C T I O N S */
487 /* U S B C A L L B A C K F U N C T I O N S */
488 /************************************************************************/
489 /************************************************************************/
490
491 static void mos7840_control_callback(struct urb *urb)
492 {
493 unsigned char *data;
494 struct moschip_port *mos7840_port;
495 __u8 regval = 0x0;
496 int result = 0;
497 int status = urb->status;
498
499 mos7840_port = urb->context;
500
501 switch (status) {
502 case 0:
503 /* success */
504 break;
505 case -ECONNRESET:
506 case -ENOENT:
507 case -ESHUTDOWN:
508 /* this urb is terminated, clean up */
509 dbg("%s - urb shutting down with status: %d", __func__,
510 status);
511 return;
512 default:
513 dbg("%s - nonzero urb status received: %d", __func__,
514 status);
515 goto exit;
516 }
517
518 dbg("%s urb buffer size is %d", __func__, urb->actual_length);
519 dbg("%s mos7840_port->MsrLsr is %d port %d", __func__,
520 mos7840_port->MsrLsr, mos7840_port->port_num);
521 data = urb->transfer_buffer;
522 regval = (__u8) data[0];
523 dbg("%s data is %x", __func__, regval);
524 if (mos7840_port->MsrLsr == 0)
525 mos7840_handle_new_msr(mos7840_port, regval);
526 else if (mos7840_port->MsrLsr == 1)
527 mos7840_handle_new_lsr(mos7840_port, regval);
528
529 exit:
530 spin_lock(&mos7840_port->pool_lock);
531 if (!mos7840_port->zombie)
532 result = usb_submit_urb(mos7840_port->int_urb, GFP_ATOMIC);
533 spin_unlock(&mos7840_port->pool_lock);
534 if (result) {
535 dev_err(&urb->dev->dev,
536 "%s - Error %d submitting interrupt urb\n",
537 __func__, result);
538 }
539 }
540
541 static int mos7840_get_reg(struct moschip_port *mcs, __u16 Wval, __u16 reg,
542 __u16 *val)
543 {
544 struct usb_device *dev = mcs->port->serial->dev;
545 struct usb_ctrlrequest *dr = mcs->dr;
546 unsigned char *buffer = mcs->ctrl_buf;
547 int ret;
548
549 dr->bRequestType = MCS_RD_RTYPE;
550 dr->bRequest = MCS_RDREQ;
551 dr->wValue = cpu_to_le16(Wval); /* 0 */
552 dr->wIndex = cpu_to_le16(reg);
553 dr->wLength = cpu_to_le16(2);
554
555 usb_fill_control_urb(mcs->control_urb, dev, usb_rcvctrlpipe(dev, 0),
556 (unsigned char *)dr, buffer, 2,
557 mos7840_control_callback, mcs);
558 mcs->control_urb->transfer_buffer_length = 2;
559 ret = usb_submit_urb(mcs->control_urb, GFP_ATOMIC);
560 return ret;
561 }
562
563 /*****************************************************************************
564 * mos7840_interrupt_callback
565 * this is the callback function for when we have received data on the
566 * interrupt endpoint.
567 *****************************************************************************/
568
569 static void mos7840_interrupt_callback(struct urb *urb)
570 {
571 int result;
572 int length;
573 struct moschip_port *mos7840_port;
574 struct usb_serial *serial;
575 __u16 Data;
576 unsigned char *data;
577 __u8 sp[5], st;
578 int i, rv = 0;
579 __u16 wval, wreg = 0;
580 int status = urb->status;
581
582 dbg("%s", " : Entering");
583
584 switch (status) {
585 case 0:
586 /* success */
587 break;
588 case -ECONNRESET:
589 case -ENOENT:
590 case -ESHUTDOWN:
591 /* this urb is terminated, clean up */
592 dbg("%s - urb shutting down with status: %d", __func__,
593 status);
594 return;
595 default:
596 dbg("%s - nonzero urb status received: %d", __func__,
597 status);
598 goto exit;
599 }
600
601 length = urb->actual_length;
602 data = urb->transfer_buffer;
603
604 serial = urb->context;
605
606 /* Moschip get 5 bytes
607 * Byte 1 IIR Port 1 (port.number is 0)
608 * Byte 2 IIR Port 2 (port.number is 1)
609 * Byte 3 IIR Port 3 (port.number is 2)
610 * Byte 4 IIR Port 4 (port.number is 3)
611 * Byte 5 FIFO status for both */
612
613 if (length && length > 5) {
614 dbg("%s", "Wrong data !!!");
615 return;
616 }
617
618 sp[0] = (__u8) data[0];
619 sp[1] = (__u8) data[1];
620 sp[2] = (__u8) data[2];
621 sp[3] = (__u8) data[3];
622 st = (__u8) data[4];
623
624 for (i = 0; i < serial->num_ports; i++) {
625 mos7840_port = mos7840_get_port_private(serial->port[i]);
626 wval =
627 (((__u16) serial->port[i]->number -
628 (__u16) (serial->minor)) + 1) << 8;
629 if (mos7840_port->open) {
630 if (sp[i] & 0x01) {
631 dbg("SP%d No Interrupt !!!", i);
632 } else {
633 switch (sp[i] & 0x0f) {
634 case SERIAL_IIR_RLS:
635 dbg("Serial Port %d: Receiver status error or ", i);
636 dbg("address bit detected in 9-bit mode");
637 mos7840_port->MsrLsr = 1;
638 wreg = LINE_STATUS_REGISTER;
639 break;
640 case SERIAL_IIR_MS:
641 dbg("Serial Port %d: Modem status change", i);
642 mos7840_port->MsrLsr = 0;
643 wreg = MODEM_STATUS_REGISTER;
644 break;
645 }
646 spin_lock(&mos7840_port->pool_lock);
647 if (!mos7840_port->zombie) {
648 rv = mos7840_get_reg(mos7840_port, wval, wreg, &Data);
649 } else {
650 spin_unlock(&mos7840_port->pool_lock);
651 return;
652 }
653 spin_unlock(&mos7840_port->pool_lock);
654 }
655 }
656 }
657 if (!(rv < 0))
658 /* the completion handler for the control urb will resubmit */
659 return;
660 exit:
661 result = usb_submit_urb(urb, GFP_ATOMIC);
662 if (result) {
663 dev_err(&urb->dev->dev,
664 "%s - Error %d submitting interrupt urb\n",
665 __func__, result);
666 }
667 }
668
669 static int mos7840_port_paranoia_check(struct usb_serial_port *port,
670 const char *function)
671 {
672 if (!port) {
673 dbg("%s - port == NULL", function);
674 return -1;
675 }
676 if (!port->serial) {
677 dbg("%s - port->serial == NULL", function);
678 return -1;
679 }
680
681 return 0;
682 }
683
684 /* Inline functions to check the sanity of a pointer that is passed to us */
685 static int mos7840_serial_paranoia_check(struct usb_serial *serial,
686 const char *function)
687 {
688 if (!serial) {
689 dbg("%s - serial == NULL", function);
690 return -1;
691 }
692 if (!serial->type) {
693 dbg("%s - serial->type == NULL!", function);
694 return -1;
695 }
696
697 return 0;
698 }
699
700 static struct usb_serial *mos7840_get_usb_serial(struct usb_serial_port *port,
701 const char *function)
702 {
703 /* if no port was specified, or it fails a paranoia check */
704 if (!port ||
705 mos7840_port_paranoia_check(port, function) ||
706 mos7840_serial_paranoia_check(port->serial, function)) {
707 /* then say that we don't have a valid usb_serial thing,
708 * which will end up genrating -ENODEV return values */
709 return NULL;
710 }
711
712 return port->serial;
713 }
714
715 /*****************************************************************************
716 * mos7840_bulk_in_callback
717 * this is the callback function for when we have received data on the
718 * bulk in endpoint.
719 *****************************************************************************/
720
721 static void mos7840_bulk_in_callback(struct urb *urb)
722 {
723 int retval;
724 unsigned char *data;
725 struct usb_serial *serial;
726 struct usb_serial_port *port;
727 struct moschip_port *mos7840_port;
728 struct tty_struct *tty;
729 int status = urb->status;
730
731 mos7840_port = urb->context;
732 if (!mos7840_port) {
733 dbg("%s", "NULL mos7840_port pointer");
734 mos7840_port->read_urb_busy = false;
735 return;
736 }
737
738 if (status) {
739 dbg("nonzero read bulk status received: %d", status);
740 mos7840_port->read_urb_busy = false;
741 return;
742 }
743
744 port = (struct usb_serial_port *)mos7840_port->port;
745 if (mos7840_port_paranoia_check(port, __func__)) {
746 dbg("%s", "Port Paranoia failed");
747 mos7840_port->read_urb_busy = false;
748 return;
749 }
750
751 serial = mos7840_get_usb_serial(port, __func__);
752 if (!serial) {
753 dbg("%s", "Bad serial pointer");
754 mos7840_port->read_urb_busy = false;
755 return;
756 }
757
758 dbg("%s", "Entering... ");
759
760 data = urb->transfer_buffer;
761
762 dbg("%s", "Entering ...........");
763
764 if (urb->actual_length) {
765 tty = tty_port_tty_get(&mos7840_port->port->port);
766 if (tty) {
767 tty_buffer_request_room(tty, urb->actual_length);
768 tty_insert_flip_string(tty, data, urb->actual_length);
769 dbg(" %s ", data);
770 tty_flip_buffer_push(tty);
771 tty_kref_put(tty);
772 }
773 mos7840_port->icount.rx += urb->actual_length;
774 smp_wmb();
775 dbg("mos7840_port->icount.rx is %d:",
776 mos7840_port->icount.rx);
777 }
778
779 if (!mos7840_port->read_urb) {
780 dbg("%s", "URB KILLED !!!");
781 mos7840_port->read_urb_busy = false;
782 return;
783 }
784
785
786 mos7840_port->read_urb->dev = serial->dev;
787
788 mos7840_port->read_urb_busy = true;
789 retval = usb_submit_urb(mos7840_port->read_urb, GFP_ATOMIC);
790
791 if (retval) {
792 dbg("usb_submit_urb(read bulk) failed, retval = %d", retval);
793 mos7840_port->read_urb_busy = false;
794 }
795 }
796
797 /*****************************************************************************
798 * mos7840_bulk_out_data_callback
799 * this is the callback function for when we have finished sending
800 * serial data on the bulk out endpoint.
801 *****************************************************************************/
802
803 static void mos7840_bulk_out_data_callback(struct urb *urb)
804 {
805 struct moschip_port *mos7840_port;
806 struct tty_struct *tty;
807 int status = urb->status;
808 int i;
809
810 mos7840_port = urb->context;
811 spin_lock(&mos7840_port->pool_lock);
812 for (i = 0; i < NUM_URBS; i++) {
813 if (urb == mos7840_port->write_urb_pool[i]) {
814 mos7840_port->busy[i] = 0;
815 break;
816 }
817 }
818 spin_unlock(&mos7840_port->pool_lock);
819
820 if (status) {
821 dbg("nonzero write bulk status received:%d", status);
822 return;
823 }
824
825 if (mos7840_port_paranoia_check(mos7840_port->port, __func__)) {
826 dbg("%s", "Port Paranoia failed");
827 return;
828 }
829
830 dbg("%s", "Entering .........");
831
832 tty = tty_port_tty_get(&mos7840_port->port->port);
833 if (tty && mos7840_port->open)
834 tty_wakeup(tty);
835 tty_kref_put(tty);
836
837 }
838
839 /************************************************************************/
840 /* 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 */
841 /************************************************************************/
842 #ifdef MCSSerialProbe
843 static int mos7840_serial_probe(struct usb_serial *serial,
844 const struct usb_device_id *id)
845 {
846
847 /*need to implement the mode_reg reading and updating\
848 structures usb_serial_ device_type\
849 (i.e num_ports, num_bulkin,bulkout etc) */
850 /* Also we can update the changes attach */
851 return 1;
852 }
853 #endif
854
855 /*****************************************************************************
856 * mos7840_open
857 * this function is called by the tty driver when a port is opened
858 * If successful, we return 0
859 * Otherwise we return a negative error number.
860 *****************************************************************************/
861
862 static int mos7840_open(struct tty_struct *tty, struct usb_serial_port *port)
863 {
864 int response;
865 int j;
866 struct usb_serial *serial;
867 struct urb *urb;
868 __u16 Data;
869 int status;
870 struct moschip_port *mos7840_port;
871 struct moschip_port *port0;
872
873 dbg ("%s enter", __func__);
874
875 if (mos7840_port_paranoia_check(port, __func__)) {
876 dbg("%s", "Port Paranoia failed");
877 return -ENODEV;
878 }
879
880 serial = port->serial;
881
882 if (mos7840_serial_paranoia_check(serial, __func__)) {
883 dbg("%s", "Serial Paranoia failed");
884 return -ENODEV;
885 }
886
887 mos7840_port = mos7840_get_port_private(port);
888 port0 = mos7840_get_port_private(serial->port[0]);
889
890 if (mos7840_port == NULL || port0 == NULL)
891 return -ENODEV;
892
893 usb_clear_halt(serial->dev, port->write_urb->pipe);
894 usb_clear_halt(serial->dev, port->read_urb->pipe);
895 port0->open_ports++;
896
897 /* Initialising the write urb pool */
898 for (j = 0; j < NUM_URBS; ++j) {
899 urb = usb_alloc_urb(0, GFP_KERNEL);
900 mos7840_port->write_urb_pool[j] = urb;
901
902 if (urb == NULL) {
903 dev_err(&port->dev, "No more urbs???\n");
904 continue;
905 }
906
907 urb->transfer_buffer = kmalloc(URB_TRANSFER_BUFFER_SIZE,
908 GFP_KERNEL);
909 if (!urb->transfer_buffer) {
910 usb_free_urb(urb);
911 mos7840_port->write_urb_pool[j] = NULL;
912 dev_err(&port->dev,
913 "%s-out of memory for urb buffers.\n",
914 __func__);
915 continue;
916 }
917 }
918
919 /*****************************************************************************
920 * Initialize MCS7840 -- Write Init values to corresponding Registers
921 *
922 * Register Index
923 * 1 : IER
924 * 2 : FCR
925 * 3 : LCR
926 * 4 : MCR
927 *
928 * 0x08 : SP1/2 Control Reg
929 *****************************************************************************/
930
931 /* NEED to check the following Block */
932
933 Data = 0x0;
934 status = mos7840_get_reg_sync(port, mos7840_port->SpRegOffset, &Data);
935 if (status < 0) {
936 dbg("Reading Spreg failed");
937 return -1;
938 }
939 Data |= 0x80;
940 status = mos7840_set_reg_sync(port, mos7840_port->SpRegOffset, Data);
941 if (status < 0) {
942 dbg("writing Spreg failed");
943 return -1;
944 }
945
946 Data &= ~0x80;
947 status = mos7840_set_reg_sync(port, mos7840_port->SpRegOffset, Data);
948 if (status < 0) {
949 dbg("writing Spreg failed");
950 return -1;
951 }
952 /* End of block to be checked */
953
954 Data = 0x0;
955 status = mos7840_get_reg_sync(port, mos7840_port->ControlRegOffset,
956 &Data);
957 if (status < 0) {
958 dbg("Reading Controlreg failed");
959 return -1;
960 }
961 Data |= 0x08; /* Driver done bit */
962 Data |= 0x20; /* rx_disable */
963 status = mos7840_set_reg_sync(port,
964 mos7840_port->ControlRegOffset, Data);
965 if (status < 0) {
966 dbg("writing Controlreg failed");
967 return -1;
968 }
969 /* do register settings here */
970 /* Set all regs to the device default values. */
971 /***********************************
972 * First Disable all interrupts.
973 ***********************************/
974 Data = 0x00;
975 status = mos7840_set_uart_reg(port, INTERRUPT_ENABLE_REGISTER, Data);
976 if (status < 0) {
977 dbg("disabling interrupts failed");
978 return -1;
979 }
980 /* Set FIFO_CONTROL_REGISTER to the default value */
981 Data = 0x00;
982 status = mos7840_set_uart_reg(port, FIFO_CONTROL_REGISTER, Data);
983 if (status < 0) {
984 dbg("Writing FIFO_CONTROL_REGISTER failed");
985 return -1;
986 }
987
988 Data = 0xcf;
989 status = mos7840_set_uart_reg(port, FIFO_CONTROL_REGISTER, Data);
990 if (status < 0) {
991 dbg("Writing FIFO_CONTROL_REGISTER failed");
992 return -1;
993 }
994
995 Data = 0x03;
996 status = mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data);
997 mos7840_port->shadowLCR = Data;
998
999 Data = 0x0b;
1000 status = mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER, Data);
1001 mos7840_port->shadowMCR = Data;
1002
1003 Data = 0x00;
1004 status = mos7840_get_uart_reg(port, LINE_CONTROL_REGISTER, &Data);
1005 mos7840_port->shadowLCR = Data;
1006
1007 Data |= SERIAL_LCR_DLAB; /* data latch enable in LCR 0x80 */
1008 status = mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data);
1009
1010 Data = 0x0c;
1011 status = mos7840_set_uart_reg(port, DIVISOR_LATCH_LSB, Data);
1012
1013 Data = 0x0;
1014 status = mos7840_set_uart_reg(port, DIVISOR_LATCH_MSB, Data);
1015
1016 Data = 0x00;
1017 status = mos7840_get_uart_reg(port, LINE_CONTROL_REGISTER, &Data);
1018
1019 Data = Data & ~SERIAL_LCR_DLAB;
1020 status = mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data);
1021 mos7840_port->shadowLCR = Data;
1022
1023 /* clearing Bulkin and Bulkout Fifo */
1024 Data = 0x0;
1025 status = mos7840_get_reg_sync(port, mos7840_port->SpRegOffset, &Data);
1026
1027 Data = Data | 0x0c;
1028 status = mos7840_set_reg_sync(port, mos7840_port->SpRegOffset, Data);
1029
1030 Data = Data & ~0x0c;
1031 status = mos7840_set_reg_sync(port, mos7840_port->SpRegOffset, Data);
1032 /* Finally enable all interrupts */
1033 Data = 0x0c;
1034 status = mos7840_set_uart_reg(port, INTERRUPT_ENABLE_REGISTER, Data);
1035
1036 /* clearing rx_disable */
1037 Data = 0x0;
1038 status = mos7840_get_reg_sync(port, mos7840_port->ControlRegOffset,
1039 &Data);
1040 Data = Data & ~0x20;
1041 status = mos7840_set_reg_sync(port, mos7840_port->ControlRegOffset,
1042 Data);
1043
1044 /* rx_negate */
1045 Data = 0x0;
1046 status = mos7840_get_reg_sync(port, mos7840_port->ControlRegOffset,
1047 &Data);
1048 Data = Data | 0x10;
1049 status = mos7840_set_reg_sync(port, mos7840_port->ControlRegOffset,
1050 Data);
1051
1052 /* Check to see if we've set up our endpoint info yet *
1053 * (can't set it up in mos7840_startup as the structures *
1054 * were not set up at that time.) */
1055 if (port0->open_ports == 1) {
1056 if (serial->port[0]->interrupt_in_buffer == NULL) {
1057 /* set up interrupt urb */
1058 usb_fill_int_urb(serial->port[0]->interrupt_in_urb,
1059 serial->dev,
1060 usb_rcvintpipe(serial->dev,
1061 serial->port[0]->interrupt_in_endpointAddress),
1062 serial->port[0]->interrupt_in_buffer,
1063 serial->port[0]->interrupt_in_urb->
1064 transfer_buffer_length,
1065 mos7840_interrupt_callback,
1066 serial,
1067 serial->port[0]->interrupt_in_urb->interval);
1068
1069 /* start interrupt read for mos7840 *
1070 * will continue as long as mos7840 is connected */
1071
1072 response =
1073 usb_submit_urb(serial->port[0]->interrupt_in_urb,
1074 GFP_KERNEL);
1075 if (response) {
1076 dev_err(&port->dev, "%s - Error %d submitting "
1077 "interrupt urb\n", __func__, response);
1078 }
1079
1080 }
1081
1082 }
1083
1084 /* see if we've set up our endpoint info yet *
1085 * (can't set it up in mos7840_startup as the *
1086 * structures were not set up at that time.) */
1087
1088 dbg("port number is %d", port->number);
1089 dbg("serial number is %d", port->serial->minor);
1090 dbg("Bulkin endpoint is %d", port->bulk_in_endpointAddress);
1091 dbg("BulkOut endpoint is %d", port->bulk_out_endpointAddress);
1092 dbg("Interrupt endpoint is %d", port->interrupt_in_endpointAddress);
1093 dbg("port's number in the device is %d", mos7840_port->port_num);
1094 mos7840_port->read_urb = port->read_urb;
1095
1096 /* set up our bulk in urb */
1097
1098 usb_fill_bulk_urb(mos7840_port->read_urb,
1099 serial->dev,
1100 usb_rcvbulkpipe(serial->dev,
1101 port->bulk_in_endpointAddress),
1102 port->bulk_in_buffer,
1103 mos7840_port->read_urb->transfer_buffer_length,
1104 mos7840_bulk_in_callback, mos7840_port);
1105
1106 dbg("mos7840_open: bulkin endpoint is %d",
1107 port->bulk_in_endpointAddress);
1108 mos7840_port->read_urb_busy = true;
1109 response = usb_submit_urb(mos7840_port->read_urb, GFP_KERNEL);
1110 if (response) {
1111 dev_err(&port->dev, "%s - Error %d submitting control urb\n",
1112 __func__, response);
1113 mos7840_port->read_urb_busy = false;
1114 }
1115
1116 /* initialize our wait queues */
1117 init_waitqueue_head(&mos7840_port->wait_chase);
1118 init_waitqueue_head(&mos7840_port->delta_msr_wait);
1119
1120 /* initialize our icount structure */
1121 memset(&(mos7840_port->icount), 0x00, sizeof(mos7840_port->icount));
1122
1123 /* initialize our port settings */
1124 /* Must set to enable ints! */
1125 mos7840_port->shadowMCR = MCR_MASTER_IE;
1126 /* send a open port command */
1127 mos7840_port->open = 1;
1128 /* mos7840_change_port_settings(mos7840_port,old_termios); */
1129 mos7840_port->icount.tx = 0;
1130 mos7840_port->icount.rx = 0;
1131
1132 dbg("usb_serial serial:%p mos7840_port:%p\n usb_serial_port port:%p",
1133 serial, mos7840_port, port);
1134
1135 dbg ("%s leave", __func__);
1136
1137 return 0;
1138
1139 }
1140
1141 /*****************************************************************************
1142 * mos7840_chars_in_buffer
1143 * this function is called by the tty driver when it wants to know how many
1144 * bytes of data we currently have outstanding in the port (data that has
1145 * been written, but hasn't made it out the port yet)
1146 * If successful, we return the number of bytes left to be written in the
1147 * system,
1148 * Otherwise we return zero.
1149 *****************************************************************************/
1150
1151 static int mos7840_chars_in_buffer(struct tty_struct *tty)
1152 {
1153 struct usb_serial_port *port = tty->driver_data;
1154 int i;
1155 int chars = 0;
1156 unsigned long flags;
1157 struct moschip_port *mos7840_port;
1158
1159 dbg("%s", " mos7840_chars_in_buffer:entering ...........");
1160
1161 if (mos7840_port_paranoia_check(port, __func__)) {
1162 dbg("%s", "Invalid port");
1163 return 0;
1164 }
1165
1166 mos7840_port = mos7840_get_port_private(port);
1167 if (mos7840_port == NULL) {
1168 dbg("%s", "mos7840_break:leaving ...........");
1169 return 0;
1170 }
1171
1172 spin_lock_irqsave(&mos7840_port->pool_lock, flags);
1173 for (i = 0; i < NUM_URBS; ++i)
1174 if (mos7840_port->busy[i])
1175 chars += URB_TRANSFER_BUFFER_SIZE;
1176 spin_unlock_irqrestore(&mos7840_port->pool_lock, flags);
1177 dbg("%s - returns %d", __func__, chars);
1178 return chars;
1179
1180 }
1181
1182 /*****************************************************************************
1183 * mos7840_close
1184 * this function is called by the tty driver when a port is closed
1185 *****************************************************************************/
1186
1187 static void mos7840_close(struct usb_serial_port *port)
1188 {
1189 struct usb_serial *serial;
1190 struct moschip_port *mos7840_port;
1191 struct moschip_port *port0;
1192 int j;
1193 __u16 Data;
1194
1195 dbg("%s", "mos7840_close:entering...");
1196
1197 if (mos7840_port_paranoia_check(port, __func__)) {
1198 dbg("%s", "Port Paranoia failed");
1199 return;
1200 }
1201
1202 serial = mos7840_get_usb_serial(port, __func__);
1203 if (!serial) {
1204 dbg("%s", "Serial Paranoia failed");
1205 return;
1206 }
1207
1208 mos7840_port = mos7840_get_port_private(port);
1209 port0 = mos7840_get_port_private(serial->port[0]);
1210
1211 if (mos7840_port == NULL || port0 == NULL)
1212 return;
1213
1214 for (j = 0; j < NUM_URBS; ++j)
1215 usb_kill_urb(mos7840_port->write_urb_pool[j]);
1216
1217 /* Freeing Write URBs */
1218 for (j = 0; j < NUM_URBS; ++j) {
1219 if (mos7840_port->write_urb_pool[j]) {
1220 if (mos7840_port->write_urb_pool[j]->transfer_buffer)
1221 kfree(mos7840_port->write_urb_pool[j]->
1222 transfer_buffer);
1223
1224 usb_free_urb(mos7840_port->write_urb_pool[j]);
1225 }
1226 }
1227
1228 /* While closing port, shutdown all bulk read, write *
1229 * and interrupt read if they exists */
1230 if (serial->dev) {
1231 if (mos7840_port->write_urb) {
1232 dbg("%s", "Shutdown bulk write");
1233 usb_kill_urb(mos7840_port->write_urb);
1234 }
1235 if (mos7840_port->read_urb) {
1236 dbg("%s", "Shutdown bulk read");
1237 usb_kill_urb(mos7840_port->read_urb);
1238 mos7840_port->read_urb_busy = false;
1239 }
1240 if ((&mos7840_port->control_urb)) {
1241 dbg("%s", "Shutdown control read");
1242 /*/ usb_kill_urb (mos7840_port->control_urb); */
1243 }
1244 }
1245 /* if(mos7840_port->ctrl_buf != NULL) */
1246 /* kfree(mos7840_port->ctrl_buf); */
1247 port0->open_ports--;
1248 dbg("mos7840_num_open_ports in close%d:in port%d",
1249 port0->open_ports, port->number);
1250 if (port0->open_ports == 0) {
1251 if (serial->port[0]->interrupt_in_urb) {
1252 dbg("%s", "Shutdown interrupt_in_urb");
1253 usb_kill_urb(serial->port[0]->interrupt_in_urb);
1254 }
1255 }
1256
1257 if (mos7840_port->write_urb) {
1258 /* if this urb had a transfer buffer already (old tx) free it */
1259 if (mos7840_port->write_urb->transfer_buffer != NULL)
1260 kfree(mos7840_port->write_urb->transfer_buffer);
1261 usb_free_urb(mos7840_port->write_urb);
1262 }
1263
1264 Data = 0x0;
1265 mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER, Data);
1266
1267 Data = 0x00;
1268 mos7840_set_uart_reg(port, INTERRUPT_ENABLE_REGISTER, Data);
1269
1270 mos7840_port->open = 0;
1271
1272 dbg("%s", "Leaving ............");
1273 }
1274
1275 /************************************************************************
1276 *
1277 * mos7840_block_until_chase_response
1278 *
1279 * This function will block the close until one of the following:
1280 * 1. Response to our Chase comes from mos7840
1281 * 2. A timeout of 10 seconds without activity has expired
1282 * (1K of mos7840 data @ 2400 baud ==> 4 sec to empty)
1283 *
1284 ************************************************************************/
1285
1286 static void mos7840_block_until_chase_response(struct tty_struct *tty,
1287 struct moschip_port *mos7840_port)
1288 {
1289 int timeout = 1 * HZ;
1290 int wait = 10;
1291 int count;
1292
1293 while (1) {
1294 count = mos7840_chars_in_buffer(tty);
1295
1296 /* Check for Buffer status */
1297 if (count <= 0)
1298 return;
1299
1300 /* Block the thread for a while */
1301 interruptible_sleep_on_timeout(&mos7840_port->wait_chase,
1302 timeout);
1303 /* No activity.. count down section */
1304 wait--;
1305 if (wait == 0) {
1306 dbg("%s - TIMEOUT", __func__);
1307 return;
1308 } else {
1309 /* Reset timeout value back to seconds */
1310 wait = 10;
1311 }
1312 }
1313
1314 }
1315
1316 /*****************************************************************************
1317 * mos7840_break
1318 * this function sends a break to the port
1319 *****************************************************************************/
1320 static void mos7840_break(struct tty_struct *tty, int break_state)
1321 {
1322 struct usb_serial_port *port = tty->driver_data;
1323 unsigned char data;
1324 struct usb_serial *serial;
1325 struct moschip_port *mos7840_port;
1326
1327 dbg("%s", "Entering ...........");
1328 dbg("mos7840_break: Start");
1329
1330 if (mos7840_port_paranoia_check(port, __func__)) {
1331 dbg("%s", "Port Paranoia failed");
1332 return;
1333 }
1334
1335 serial = mos7840_get_usb_serial(port, __func__);
1336 if (!serial) {
1337 dbg("%s", "Serial Paranoia failed");
1338 return;
1339 }
1340
1341 mos7840_port = mos7840_get_port_private(port);
1342
1343 if (mos7840_port == NULL)
1344 return;
1345
1346 if (serial->dev)
1347 /* flush and block until tx is empty */
1348 mos7840_block_until_chase_response(tty, mos7840_port);
1349
1350 if (break_state == -1)
1351 data = mos7840_port->shadowLCR | LCR_SET_BREAK;
1352 else
1353 data = mos7840_port->shadowLCR & ~LCR_SET_BREAK;
1354
1355 /* FIXME: no locking on shadowLCR anywhere in driver */
1356 mos7840_port->shadowLCR = data;
1357 dbg("mcs7840_break mos7840_port->shadowLCR is %x",
1358 mos7840_port->shadowLCR);
1359 mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER,
1360 mos7840_port->shadowLCR);
1361
1362 return;
1363 }
1364
1365 /*****************************************************************************
1366 * mos7840_write_room
1367 * this function is called by the tty driver when it wants to know how many
1368 * bytes of data we can accept for a specific port.
1369 * If successful, we return the amount of room that we have for this port
1370 * Otherwise we return a negative error number.
1371 *****************************************************************************/
1372
1373 static int mos7840_write_room(struct tty_struct *tty)
1374 {
1375 struct usb_serial_port *port = tty->driver_data;
1376 int i;
1377 int room = 0;
1378 unsigned long flags;
1379 struct moschip_port *mos7840_port;
1380
1381 dbg("%s", " mos7840_write_room:entering ...........");
1382
1383 if (mos7840_port_paranoia_check(port, __func__)) {
1384 dbg("%s", "Invalid port");
1385 dbg("%s", " mos7840_write_room:leaving ...........");
1386 return -1;
1387 }
1388
1389 mos7840_port = mos7840_get_port_private(port);
1390 if (mos7840_port == NULL) {
1391 dbg("%s", "mos7840_break:leaving ...........");
1392 return -1;
1393 }
1394
1395 spin_lock_irqsave(&mos7840_port->pool_lock, flags);
1396 for (i = 0; i < NUM_URBS; ++i) {
1397 if (!mos7840_port->busy[i])
1398 room += URB_TRANSFER_BUFFER_SIZE;
1399 }
1400 spin_unlock_irqrestore(&mos7840_port->pool_lock, flags);
1401
1402 room = (room == 0) ? 0 : room - URB_TRANSFER_BUFFER_SIZE + 1;
1403 dbg("%s - returns %d", __func__, room);
1404 return room;
1405
1406 }
1407
1408 /*****************************************************************************
1409 * mos7840_write
1410 * this function is called by the tty driver when data should be written to
1411 * the port.
1412 * If successful, we return the number of bytes written, otherwise we
1413 * return a negative error number.
1414 *****************************************************************************/
1415
1416 static int mos7840_write(struct tty_struct *tty, struct usb_serial_port *port,
1417 const unsigned char *data, int count)
1418 {
1419 int status;
1420 int i;
1421 int bytes_sent = 0;
1422 int transfer_size;
1423 unsigned long flags;
1424
1425 struct moschip_port *mos7840_port;
1426 struct usb_serial *serial;
1427 struct urb *urb;
1428 /* __u16 Data; */
1429 const unsigned char *current_position = data;
1430 unsigned char *data1;
1431 dbg("%s", "entering ...........");
1432 /* dbg("mos7840_write: mos7840_port->shadowLCR is %x",
1433 mos7840_port->shadowLCR); */
1434
1435 #ifdef NOTMOS7840
1436 Data = 0x00;
1437 status = mos7840_get_uart_reg(port, LINE_CONTROL_REGISTER, &Data);
1438 mos7840_port->shadowLCR = Data;
1439 dbg("mos7840_write: LINE_CONTROL_REGISTER is %x", Data);
1440 dbg("mos7840_write: mos7840_port->shadowLCR is %x",
1441 mos7840_port->shadowLCR);
1442
1443 /* Data = 0x03; */
1444 /* status = mos7840_set_uart_reg(port,LINE_CONTROL_REGISTER,Data); */
1445 /* mos7840_port->shadowLCR=Data;//Need to add later */
1446
1447 Data |= SERIAL_LCR_DLAB; /* data latch enable in LCR 0x80 */
1448 status = mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data);
1449
1450 /* Data = 0x0c; */
1451 /* status = mos7840_set_uart_reg(port,DIVISOR_LATCH_LSB,Data); */
1452 Data = 0x00;
1453 status = mos7840_get_uart_reg(port, DIVISOR_LATCH_LSB, &Data);
1454 dbg("mos7840_write:DLL value is %x", Data);
1455
1456 Data = 0x0;
1457 status = mos7840_get_uart_reg(port, DIVISOR_LATCH_MSB, &Data);
1458 dbg("mos7840_write:DLM value is %x", Data);
1459
1460 Data = Data & ~SERIAL_LCR_DLAB;
1461 dbg("mos7840_write: mos7840_port->shadowLCR is %x",
1462 mos7840_port->shadowLCR);
1463 status = mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data);
1464 #endif
1465
1466 if (mos7840_port_paranoia_check(port, __func__)) {
1467 dbg("%s", "Port Paranoia failed");
1468 return -1;
1469 }
1470
1471 serial = port->serial;
1472 if (mos7840_serial_paranoia_check(serial, __func__)) {
1473 dbg("%s", "Serial Paranoia failed");
1474 return -1;
1475 }
1476
1477 mos7840_port = mos7840_get_port_private(port);
1478 if (mos7840_port == NULL) {
1479 dbg("%s", "mos7840_port is NULL");
1480 return -1;
1481 }
1482
1483 /* try to find a free urb in the list */
1484 urb = NULL;
1485
1486 spin_lock_irqsave(&mos7840_port->pool_lock, flags);
1487 for (i = 0; i < NUM_URBS; ++i) {
1488 if (!mos7840_port->busy[i]) {
1489 mos7840_port->busy[i] = 1;
1490 urb = mos7840_port->write_urb_pool[i];
1491 dbg("URB:%d", i);
1492 break;
1493 }
1494 }
1495 spin_unlock_irqrestore(&mos7840_port->pool_lock, flags);
1496
1497 if (urb == NULL) {
1498 dbg("%s - no more free urbs", __func__);
1499 goto exit;
1500 }
1501
1502 if (urb->transfer_buffer == NULL) {
1503 urb->transfer_buffer =
1504 kmalloc(URB_TRANSFER_BUFFER_SIZE, GFP_KERNEL);
1505
1506 if (urb->transfer_buffer == NULL) {
1507 dev_err(&port->dev, "%s no more kernel memory...\n",
1508 __func__);
1509 goto exit;
1510 }
1511 }
1512 transfer_size = min(count, URB_TRANSFER_BUFFER_SIZE);
1513
1514 memcpy(urb->transfer_buffer, current_position, transfer_size);
1515
1516 /* fill urb with data and submit */
1517 usb_fill_bulk_urb(urb,
1518 serial->dev,
1519 usb_sndbulkpipe(serial->dev,
1520 port->bulk_out_endpointAddress),
1521 urb->transfer_buffer,
1522 transfer_size,
1523 mos7840_bulk_out_data_callback, mos7840_port);
1524
1525 data1 = urb->transfer_buffer;
1526 dbg("bulkout endpoint is %d", port->bulk_out_endpointAddress);
1527
1528 /* send it down the pipe */
1529 status = usb_submit_urb(urb, GFP_ATOMIC);
1530
1531 if (status) {
1532 mos7840_port->busy[i] = 0;
1533 dev_err(&port->dev, "%s - usb_submit_urb(write bulk) failed "
1534 "with status = %d\n", __func__, status);
1535 bytes_sent = status;
1536 goto exit;
1537 }
1538 bytes_sent = transfer_size;
1539 mos7840_port->icount.tx += transfer_size;
1540 smp_wmb();
1541 dbg("mos7840_port->icount.tx is %d:", mos7840_port->icount.tx);
1542 exit:
1543 return bytes_sent;
1544
1545 }
1546
1547 /*****************************************************************************
1548 * mos7840_throttle
1549 * this function is called by the tty driver when it wants to stop the data
1550 * being read from the port.
1551 *****************************************************************************/
1552
1553 static void mos7840_throttle(struct tty_struct *tty)
1554 {
1555 struct usb_serial_port *port = tty->driver_data;
1556 struct moschip_port *mos7840_port;
1557 int status;
1558
1559 if (mos7840_port_paranoia_check(port, __func__)) {
1560 dbg("%s", "Invalid port");
1561 return;
1562 }
1563
1564 dbg("- port %d", port->number);
1565
1566 mos7840_port = mos7840_get_port_private(port);
1567
1568 if (mos7840_port == NULL)
1569 return;
1570
1571 if (!mos7840_port->open) {
1572 dbg("%s", "port not opened");
1573 return;
1574 }
1575
1576 dbg("%s", "Entering ..........");
1577
1578 /* if we are implementing XON/XOFF, send the stop character */
1579 if (I_IXOFF(tty)) {
1580 unsigned char stop_char = STOP_CHAR(tty);
1581 status = mos7840_write(tty, port, &stop_char, 1);
1582 if (status <= 0)
1583 return;
1584 }
1585 /* if we are implementing RTS/CTS, toggle that line */
1586 if (tty->termios->c_cflag & CRTSCTS) {
1587 mos7840_port->shadowMCR &= ~MCR_RTS;
1588 status = mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER,
1589 mos7840_port->shadowMCR);
1590 if (status < 0)
1591 return;
1592 }
1593
1594 return;
1595 }
1596
1597 /*****************************************************************************
1598 * mos7840_unthrottle
1599 * this function is called by the tty driver when it wants to resume
1600 * the data being read from the port (called after mos7840_throttle is
1601 * called)
1602 *****************************************************************************/
1603 static void mos7840_unthrottle(struct tty_struct *tty)
1604 {
1605 struct usb_serial_port *port = tty->driver_data;
1606 int status;
1607 struct moschip_port *mos7840_port = mos7840_get_port_private(port);
1608
1609 if (mos7840_port_paranoia_check(port, __func__)) {
1610 dbg("%s", "Invalid port");
1611 return;
1612 }
1613
1614 if (mos7840_port == NULL)
1615 return;
1616
1617 if (!mos7840_port->open) {
1618 dbg("%s - port not opened", __func__);
1619 return;
1620 }
1621
1622 dbg("%s", "Entering ..........");
1623
1624 /* if we are implementing XON/XOFF, send the start character */
1625 if (I_IXOFF(tty)) {
1626 unsigned char start_char = START_CHAR(tty);
1627 status = mos7840_write(tty, port, &start_char, 1);
1628 if (status <= 0)
1629 return;
1630 }
1631
1632 /* if we are implementing RTS/CTS, toggle that line */
1633 if (tty->termios->c_cflag & CRTSCTS) {
1634 mos7840_port->shadowMCR |= MCR_RTS;
1635 status = mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER,
1636 mos7840_port->shadowMCR);
1637 if (status < 0)
1638 return;
1639 }
1640 }
1641
1642 static int mos7840_tiocmget(struct tty_struct *tty, struct file *file)
1643 {
1644 struct usb_serial_port *port = tty->driver_data;
1645 struct moschip_port *mos7840_port;
1646 unsigned int result;
1647 __u16 msr;
1648 __u16 mcr;
1649 int status;
1650 mos7840_port = mos7840_get_port_private(port);
1651
1652 dbg("%s - port %d", __func__, port->number);
1653
1654 if (mos7840_port == NULL)
1655 return -ENODEV;
1656
1657 status = mos7840_get_uart_reg(port, MODEM_STATUS_REGISTER, &msr);
1658 status = mos7840_get_uart_reg(port, MODEM_CONTROL_REGISTER, &mcr);
1659 result = ((mcr & MCR_DTR) ? TIOCM_DTR : 0)
1660 | ((mcr & MCR_RTS) ? TIOCM_RTS : 0)
1661 | ((mcr & MCR_LOOPBACK) ? TIOCM_LOOP : 0)
1662 | ((msr & MOS7840_MSR_CTS) ? TIOCM_CTS : 0)
1663 | ((msr & MOS7840_MSR_CD) ? TIOCM_CAR : 0)
1664 | ((msr & MOS7840_MSR_RI) ? TIOCM_RI : 0)
1665 | ((msr & MOS7840_MSR_DSR) ? TIOCM_DSR : 0);
1666
1667 dbg("%s - 0x%04X", __func__, result);
1668
1669 return result;
1670 }
1671
1672 static int mos7840_tiocmset(struct tty_struct *tty, struct file *file,
1673 unsigned int set, unsigned int clear)
1674 {
1675 struct usb_serial_port *port = tty->driver_data;
1676 struct moschip_port *mos7840_port;
1677 unsigned int mcr;
1678 int status;
1679
1680 dbg("%s - port %d", __func__, port->number);
1681
1682 mos7840_port = mos7840_get_port_private(port);
1683
1684 if (mos7840_port == NULL)
1685 return -ENODEV;
1686
1687 /* FIXME: What locks the port registers ? */
1688 mcr = mos7840_port->shadowMCR;
1689 if (clear & TIOCM_RTS)
1690 mcr &= ~MCR_RTS;
1691 if (clear & TIOCM_DTR)
1692 mcr &= ~MCR_DTR;
1693 if (clear & TIOCM_LOOP)
1694 mcr &= ~MCR_LOOPBACK;
1695
1696 if (set & TIOCM_RTS)
1697 mcr |= MCR_RTS;
1698 if (set & TIOCM_DTR)
1699 mcr |= MCR_DTR;
1700 if (set & TIOCM_LOOP)
1701 mcr |= MCR_LOOPBACK;
1702
1703 mos7840_port->shadowMCR = mcr;
1704
1705 status = mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER, mcr);
1706 if (status < 0) {
1707 dbg("setting MODEM_CONTROL_REGISTER Failed");
1708 return status;
1709 }
1710
1711 return 0;
1712 }
1713
1714 /*****************************************************************************
1715 * mos7840_calc_baud_rate_divisor
1716 * this function calculates the proper baud rate divisor for the specified
1717 * baud rate.
1718 *****************************************************************************/
1719 static int mos7840_calc_baud_rate_divisor(int baudRate, int *divisor,
1720 __u16 *clk_sel_val)
1721 {
1722
1723 dbg("%s - %d", __func__, baudRate);
1724
1725 if (baudRate <= 115200) {
1726 *divisor = 115200 / baudRate;
1727 *clk_sel_val = 0x0;
1728 }
1729 if ((baudRate > 115200) && (baudRate <= 230400)) {
1730 *divisor = 230400 / baudRate;
1731 *clk_sel_val = 0x10;
1732 } else if ((baudRate > 230400) && (baudRate <= 403200)) {
1733 *divisor = 403200 / baudRate;
1734 *clk_sel_val = 0x20;
1735 } else if ((baudRate > 403200) && (baudRate <= 460800)) {
1736 *divisor = 460800 / baudRate;
1737 *clk_sel_val = 0x30;
1738 } else if ((baudRate > 460800) && (baudRate <= 806400)) {
1739 *divisor = 806400 / baudRate;
1740 *clk_sel_val = 0x40;
1741 } else if ((baudRate > 806400) && (baudRate <= 921600)) {
1742 *divisor = 921600 / baudRate;
1743 *clk_sel_val = 0x50;
1744 } else if ((baudRate > 921600) && (baudRate <= 1572864)) {
1745 *divisor = 1572864 / baudRate;
1746 *clk_sel_val = 0x60;
1747 } else if ((baudRate > 1572864) && (baudRate <= 3145728)) {
1748 *divisor = 3145728 / baudRate;
1749 *clk_sel_val = 0x70;
1750 }
1751 return 0;
1752
1753 #ifdef NOTMCS7840
1754
1755 for (i = 0; i < ARRAY_SIZE(mos7840_divisor_table); i++) {
1756 if (mos7840_divisor_table[i].BaudRate == baudrate) {
1757 *divisor = mos7840_divisor_table[i].Divisor;
1758 return 0;
1759 }
1760 }
1761
1762 /* After trying for all the standard baud rates *
1763 * Try calculating the divisor for this baud rate */
1764
1765 if (baudrate > 75 && baudrate < 230400) {
1766 /* get the divisor */
1767 custom = (__u16) (230400L / baudrate);
1768
1769 /* Check for round off */
1770 round1 = (__u16) (2304000L / baudrate);
1771 round = (__u16) (round1 - (custom * 10));
1772 if (round > 4)
1773 custom++;
1774 *divisor = custom;
1775
1776 dbg(" Baud %d = %d", baudrate, custom);
1777 return 0;
1778 }
1779
1780 dbg("%s", " Baud calculation Failed...");
1781 return -1;
1782 #endif
1783 }
1784
1785 /*****************************************************************************
1786 * mos7840_send_cmd_write_baud_rate
1787 * this function sends the proper command to change the baud rate of the
1788 * specified port.
1789 *****************************************************************************/
1790
1791 static int mos7840_send_cmd_write_baud_rate(struct moschip_port *mos7840_port,
1792 int baudRate)
1793 {
1794 int divisor = 0;
1795 int status;
1796 __u16 Data;
1797 unsigned char number;
1798 __u16 clk_sel_val;
1799 struct usb_serial_port *port;
1800
1801 if (mos7840_port == NULL)
1802 return -1;
1803
1804 port = (struct usb_serial_port *)mos7840_port->port;
1805 if (mos7840_port_paranoia_check(port, __func__)) {
1806 dbg("%s", "Invalid port");
1807 return -1;
1808 }
1809
1810 if (mos7840_serial_paranoia_check(port->serial, __func__)) {
1811 dbg("%s", "Invalid Serial");
1812 return -1;
1813 }
1814
1815 dbg("%s", "Entering ..........");
1816
1817 number = mos7840_port->port->number - mos7840_port->port->serial->minor;
1818
1819 dbg("%s - port = %d, baud = %d", __func__,
1820 mos7840_port->port->number, baudRate);
1821 /* reset clk_uart_sel in spregOffset */
1822 if (baudRate > 115200) {
1823 #ifdef HW_flow_control
1824 /* NOTE: need to see the pther register to modify */
1825 /* setting h/w flow control bit to 1 */
1826 Data = 0x2b;
1827 mos7840_port->shadowMCR = Data;
1828 status = mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER,
1829 Data);
1830 if (status < 0) {
1831 dbg("Writing spreg failed in set_serial_baud");
1832 return -1;
1833 }
1834 #endif
1835
1836 } else {
1837 #ifdef HW_flow_control
1838 / *setting h/w flow control bit to 0 */
1839 Data = 0xb;
1840 mos7840_port->shadowMCR = Data;
1841 status = mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER,
1842 Data);
1843 if (status < 0) {
1844 dbg("Writing spreg failed in set_serial_baud");
1845 return -1;
1846 }
1847 #endif
1848
1849 }
1850
1851 if (1) { /* baudRate <= 115200) */
1852 clk_sel_val = 0x0;
1853 Data = 0x0;
1854 status = mos7840_calc_baud_rate_divisor(baudRate, &divisor,
1855 &clk_sel_val);
1856 status = mos7840_get_reg_sync(port, mos7840_port->SpRegOffset,
1857 &Data);
1858 if (status < 0) {
1859 dbg("reading spreg failed in set_serial_baud");
1860 return -1;
1861 }
1862 Data = (Data & 0x8f) | clk_sel_val;
1863 status = mos7840_set_reg_sync(port, mos7840_port->SpRegOffset,
1864 Data);
1865 if (status < 0) {
1866 dbg("Writing spreg failed in set_serial_baud");
1867 return -1;
1868 }
1869 /* Calculate the Divisor */
1870
1871 if (status) {
1872 dev_err(&port->dev, "%s - bad baud rate\n", __func__);
1873 return status;
1874 }
1875 /* Enable 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 /* Write the divisor */
1881 Data = (unsigned char)(divisor & 0xff);
1882 dbg("set_serial_baud Value to write DLL is %x", Data);
1883 mos7840_set_uart_reg(port, DIVISOR_LATCH_LSB, Data);
1884
1885 Data = (unsigned char)((divisor & 0xff00) >> 8);
1886 dbg("set_serial_baud Value to write DLM is %x", Data);
1887 mos7840_set_uart_reg(port, DIVISOR_LATCH_MSB, Data);
1888
1889 /* Disable access to divisor latch */
1890 Data = mos7840_port->shadowLCR & ~SERIAL_LCR_DLAB;
1891 mos7840_port->shadowLCR = Data;
1892 mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data);
1893
1894 }
1895 return status;
1896 }
1897
1898 /*****************************************************************************
1899 * mos7840_change_port_settings
1900 * This routine is called to set the UART on the device to match
1901 * the specified new settings.
1902 *****************************************************************************/
1903
1904 static void mos7840_change_port_settings(struct tty_struct *tty,
1905 struct moschip_port *mos7840_port, struct ktermios *old_termios)
1906 {
1907 int baud;
1908 unsigned cflag;
1909 unsigned iflag;
1910 __u8 lData;
1911 __u8 lParity;
1912 __u8 lStop;
1913 int status;
1914 __u16 Data;
1915 struct usb_serial_port *port;
1916 struct usb_serial *serial;
1917
1918 if (mos7840_port == NULL)
1919 return;
1920
1921 port = (struct usb_serial_port *)mos7840_port->port;
1922
1923 if (mos7840_port_paranoia_check(port, __func__)) {
1924 dbg("%s", "Invalid port");
1925 return;
1926 }
1927
1928 if (mos7840_serial_paranoia_check(port->serial, __func__)) {
1929 dbg("%s", "Invalid Serial");
1930 return;
1931 }
1932
1933 serial = port->serial;
1934
1935 dbg("%s - port %d", __func__, mos7840_port->port->number);
1936
1937 if (!mos7840_port->open) {
1938 dbg("%s - port not opened", __func__);
1939 return;
1940 }
1941
1942 dbg("%s", "Entering ..........");
1943
1944 lData = LCR_BITS_8;
1945 lStop = LCR_STOP_1;
1946 lParity = LCR_PAR_NONE;
1947
1948 cflag = tty->termios->c_cflag;
1949 iflag = tty->termios->c_iflag;
1950
1951 /* Change the number of bits */
1952 if (cflag & CSIZE) {
1953 switch (cflag & CSIZE) {
1954 case CS5:
1955 lData = LCR_BITS_5;
1956 break;
1957
1958 case CS6:
1959 lData = LCR_BITS_6;
1960 break;
1961
1962 case CS7:
1963 lData = LCR_BITS_7;
1964 break;
1965 default:
1966 case CS8:
1967 lData = LCR_BITS_8;
1968 break;
1969 }
1970 }
1971 /* Change the Parity bit */
1972 if (cflag & PARENB) {
1973 if (cflag & PARODD) {
1974 lParity = LCR_PAR_ODD;
1975 dbg("%s - parity = odd", __func__);
1976 } else {
1977 lParity = LCR_PAR_EVEN;
1978 dbg("%s - parity = even", __func__);
1979 }
1980
1981 } else {
1982 dbg("%s - parity = none", __func__);
1983 }
1984
1985 if (cflag & CMSPAR)
1986 lParity = lParity | 0x20;
1987
1988 /* Change the Stop bit */
1989 if (cflag & CSTOPB) {
1990 lStop = LCR_STOP_2;
1991 dbg("%s - stop bits = 2", __func__);
1992 } else {
1993 lStop = LCR_STOP_1;
1994 dbg("%s - stop bits = 1", __func__);
1995 }
1996
1997 /* Update the LCR with the correct value */
1998 mos7840_port->shadowLCR &=
1999 ~(LCR_BITS_MASK | LCR_STOP_MASK | LCR_PAR_MASK);
2000 mos7840_port->shadowLCR |= (lData | lParity | lStop);
2001
2002 dbg("mos7840_change_port_settings mos7840_port->shadowLCR is %x",
2003 mos7840_port->shadowLCR);
2004 /* Disable Interrupts */
2005 Data = 0x00;
2006 mos7840_set_uart_reg(port, INTERRUPT_ENABLE_REGISTER, Data);
2007
2008 Data = 0x00;
2009 mos7840_set_uart_reg(port, FIFO_CONTROL_REGISTER, Data);
2010
2011 Data = 0xcf;
2012 mos7840_set_uart_reg(port, FIFO_CONTROL_REGISTER, Data);
2013
2014 /* Send the updated LCR value to the mos7840 */
2015 Data = mos7840_port->shadowLCR;
2016
2017 mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data);
2018
2019 Data = 0x00b;
2020 mos7840_port->shadowMCR = Data;
2021 mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER, Data);
2022 Data = 0x00b;
2023 mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER, Data);
2024
2025 /* set up the MCR register and send it to the mos7840 */
2026
2027 mos7840_port->shadowMCR = MCR_MASTER_IE;
2028 if (cflag & CBAUD)
2029 mos7840_port->shadowMCR |= (MCR_DTR | MCR_RTS);
2030
2031 if (cflag & CRTSCTS)
2032 mos7840_port->shadowMCR |= (MCR_XON_ANY);
2033 else
2034 mos7840_port->shadowMCR &= ~(MCR_XON_ANY);
2035
2036 Data = mos7840_port->shadowMCR;
2037 mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER, Data);
2038
2039 /* Determine divisor based on baud rate */
2040 baud = tty_get_baud_rate(tty);
2041
2042 if (!baud) {
2043 /* pick a default, any default... */
2044 dbg("%s", "Picked default baud...");
2045 baud = 9600;
2046 }
2047
2048 dbg("%s - baud rate = %d", __func__, baud);
2049 status = mos7840_send_cmd_write_baud_rate(mos7840_port, baud);
2050
2051 /* Enable Interrupts */
2052 Data = 0x0c;
2053 mos7840_set_uart_reg(port, INTERRUPT_ENABLE_REGISTER, Data);
2054
2055 if (mos7840_port->read_urb_busy == false) {
2056 mos7840_port->read_urb->dev = serial->dev;
2057 mos7840_port->read_urb_busy = true;
2058 status = usb_submit_urb(mos7840_port->read_urb, GFP_ATOMIC);
2059 if (status) {
2060 dbg("usb_submit_urb(read bulk) failed, status = %d",
2061 status);
2062 mos7840_port->read_urb_busy = false;
2063 }
2064 }
2065 wake_up(&mos7840_port->delta_msr_wait);
2066 mos7840_port->delta_msr_cond = 1;
2067 dbg("mos7840_change_port_settings mos7840_port->shadowLCR is End %x",
2068 mos7840_port->shadowLCR);
2069
2070 return;
2071 }
2072
2073 /*****************************************************************************
2074 * mos7840_set_termios
2075 * this function is called by the tty driver when it wants to change
2076 * the termios structure
2077 *****************************************************************************/
2078
2079 static void mos7840_set_termios(struct tty_struct *tty,
2080 struct usb_serial_port *port,
2081 struct ktermios *old_termios)
2082 {
2083 int status;
2084 unsigned int cflag;
2085 struct usb_serial *serial;
2086 struct moschip_port *mos7840_port;
2087 dbg("mos7840_set_termios: START");
2088 if (mos7840_port_paranoia_check(port, __func__)) {
2089 dbg("%s", "Invalid port");
2090 return;
2091 }
2092
2093 serial = port->serial;
2094
2095 if (mos7840_serial_paranoia_check(serial, __func__)) {
2096 dbg("%s", "Invalid Serial");
2097 return;
2098 }
2099
2100 mos7840_port = mos7840_get_port_private(port);
2101
2102 if (mos7840_port == NULL)
2103 return;
2104
2105 if (!mos7840_port->open) {
2106 dbg("%s - port not opened", __func__);
2107 return;
2108 }
2109
2110 dbg("%s", "setting termios - ");
2111
2112 cflag = tty->termios->c_cflag;
2113
2114 dbg("%s - clfag %08x iflag %08x", __func__,
2115 tty->termios->c_cflag, RELEVANT_IFLAG(tty->termios->c_iflag));
2116 dbg("%s - old clfag %08x old iflag %08x", __func__,
2117 old_termios->c_cflag, RELEVANT_IFLAG(old_termios->c_iflag));
2118 dbg("%s - port %d", __func__, port->number);
2119
2120 /* change the port settings to the new ones specified */
2121
2122 mos7840_change_port_settings(tty, mos7840_port, old_termios);
2123
2124 if (!mos7840_port->read_urb) {
2125 dbg("%s", "URB KILLED !!!!!");
2126 return;
2127 }
2128
2129 if (mos7840_port->read_urb_busy == false) {
2130 mos7840_port->read_urb->dev = serial->dev;
2131 mos7840_port->read_urb_busy = true;
2132 status = usb_submit_urb(mos7840_port->read_urb, GFP_ATOMIC);
2133 if (status) {
2134 dbg("usb_submit_urb(read bulk) failed, status = %d",
2135 status);
2136 mos7840_port->read_urb_busy = false;
2137 }
2138 }
2139 return;
2140 }
2141
2142 /*****************************************************************************
2143 * mos7840_get_lsr_info - get line status register info
2144 *
2145 * Purpose: Let user call ioctl() to get info when the UART physically
2146 * is emptied. On bus types like RS485, the transmitter must
2147 * release the bus after transmitting. This must be done when
2148 * the transmit shift register is empty, not be done when the
2149 * transmit holding register is empty. This functionality
2150 * allows an RS485 driver to be written in user space.
2151 *****************************************************************************/
2152
2153 static int mos7840_get_lsr_info(struct tty_struct *tty,
2154 unsigned int __user *value)
2155 {
2156 int count;
2157 unsigned int result = 0;
2158
2159 count = mos7840_chars_in_buffer(tty);
2160 if (count == 0) {
2161 dbg("%s -- Empty", __func__);
2162 result = TIOCSER_TEMT;
2163 }
2164
2165 if (copy_to_user(value, &result, sizeof(int)))
2166 return -EFAULT;
2167 return 0;
2168 }
2169
2170 /*****************************************************************************
2171 * mos7840_get_serial_info
2172 * function to get information about serial port
2173 *****************************************************************************/
2174
2175 static int mos7840_get_serial_info(struct moschip_port *mos7840_port,
2176 struct serial_struct __user *retinfo)
2177 {
2178 struct serial_struct tmp;
2179
2180 if (mos7840_port == NULL)
2181 return -1;
2182
2183 if (!retinfo)
2184 return -EFAULT;
2185
2186 memset(&tmp, 0, sizeof(tmp));
2187
2188 tmp.type = PORT_16550A;
2189 tmp.line = mos7840_port->port->serial->minor;
2190 tmp.port = mos7840_port->port->number;
2191 tmp.irq = 0;
2192 tmp.flags = ASYNC_SKIP_TEST | ASYNC_AUTO_IRQ;
2193 tmp.xmit_fifo_size = NUM_URBS * URB_TRANSFER_BUFFER_SIZE;
2194 tmp.baud_base = 9600;
2195 tmp.close_delay = 5 * HZ;
2196 tmp.closing_wait = 30 * HZ;
2197
2198 if (copy_to_user(retinfo, &tmp, sizeof(*retinfo)))
2199 return -EFAULT;
2200 return 0;
2201 }
2202
2203 /*****************************************************************************
2204 * SerialIoctl
2205 * this function handles any ioctl calls to the driver
2206 *****************************************************************************/
2207
2208 static int mos7840_ioctl(struct tty_struct *tty, struct file *file,
2209 unsigned int cmd, unsigned long arg)
2210 {
2211 struct usb_serial_port *port = tty->driver_data;
2212 void __user *argp = (void __user *)arg;
2213 struct moschip_port *mos7840_port;
2214
2215 struct async_icount cnow;
2216 struct async_icount cprev;
2217 struct serial_icounter_struct icount;
2218
2219 if (mos7840_port_paranoia_check(port, __func__)) {
2220 dbg("%s", "Invalid port");
2221 return -1;
2222 }
2223
2224 mos7840_port = mos7840_get_port_private(port);
2225
2226 if (mos7840_port == NULL)
2227 return -1;
2228
2229 dbg("%s - port %d, cmd = 0x%x", __func__, port->number, cmd);
2230
2231 switch (cmd) {
2232 /* return number of bytes available */
2233
2234 case TIOCSERGETLSR:
2235 dbg("%s (%d) TIOCSERGETLSR", __func__, port->number);
2236 return mos7840_get_lsr_info(tty, argp);
2237 return 0;
2238
2239 case TIOCGSERIAL:
2240 dbg("%s (%d) TIOCGSERIAL", __func__, port->number);
2241 return mos7840_get_serial_info(mos7840_port, argp);
2242
2243 case TIOCSSERIAL:
2244 dbg("%s (%d) TIOCSSERIAL", __func__, port->number);
2245 break;
2246
2247 case TIOCMIWAIT:
2248 dbg("%s (%d) TIOCMIWAIT", __func__, port->number);
2249 cprev = mos7840_port->icount;
2250 while (1) {
2251 /* interruptible_sleep_on(&mos7840_port->delta_msr_wait); */
2252 mos7840_port->delta_msr_cond = 0;
2253 wait_event_interruptible(mos7840_port->delta_msr_wait,
2254 (mos7840_port->
2255 delta_msr_cond == 1));
2256
2257 /* see if a signal did it */
2258 if (signal_pending(current))
2259 return -ERESTARTSYS;
2260 cnow = mos7840_port->icount;
2261 smp_rmb();
2262 if (cnow.rng == cprev.rng && cnow.dsr == cprev.dsr &&
2263 cnow.dcd == cprev.dcd && cnow.cts == cprev.cts)
2264 return -EIO; /* no change => error */
2265 if (((arg & TIOCM_RNG) && (cnow.rng != cprev.rng)) ||
2266 ((arg & TIOCM_DSR) && (cnow.dsr != cprev.dsr)) ||
2267 ((arg & TIOCM_CD) && (cnow.dcd != cprev.dcd)) ||
2268 ((arg & TIOCM_CTS) && (cnow.cts != cprev.cts))) {
2269 return 0;
2270 }
2271 cprev = cnow;
2272 }
2273 /* NOTREACHED */
2274 break;
2275
2276 case TIOCGICOUNT:
2277 cnow = mos7840_port->icount;
2278 smp_rmb();
2279 icount.cts = cnow.cts;
2280 icount.dsr = cnow.dsr;
2281 icount.rng = cnow.rng;
2282 icount.dcd = cnow.dcd;
2283 icount.rx = cnow.rx;
2284 icount.tx = cnow.tx;
2285 icount.frame = cnow.frame;
2286 icount.overrun = cnow.overrun;
2287 icount.parity = cnow.parity;
2288 icount.brk = cnow.brk;
2289 icount.buf_overrun = cnow.buf_overrun;
2290
2291 dbg("%s (%d) TIOCGICOUNT RX=%d, TX=%d", __func__,
2292 port->number, icount.rx, icount.tx);
2293 if (copy_to_user(argp, &icount, sizeof(icount)))
2294 return -EFAULT;
2295 return 0;
2296 default:
2297 break;
2298 }
2299 return -ENOIOCTLCMD;
2300 }
2301
2302 static int mos7840_calc_num_ports(struct usb_serial *serial)
2303 {
2304 int mos7840_num_ports = 0;
2305
2306 dbg("numberofendpoints: cur %d, alt %d",
2307 (int)serial->interface->cur_altsetting->desc.bNumEndpoints,
2308 (int)serial->interface->altsetting->desc.bNumEndpoints);
2309 if (serial->interface->cur_altsetting->desc.bNumEndpoints == 5) {
2310 mos7840_num_ports = serial->num_ports = 2;
2311 } else if (serial->interface->cur_altsetting->desc.bNumEndpoints == 9) {
2312 serial->num_bulk_in = 4;
2313 serial->num_bulk_out = 4;
2314 mos7840_num_ports = serial->num_ports = 4;
2315 }
2316 dbg ("mos7840_num_ports = %d", mos7840_num_ports);
2317 return mos7840_num_ports;
2318 }
2319
2320 /****************************************************************************
2321 * mos7840_startup
2322 ****************************************************************************/
2323
2324 static int mos7840_startup(struct usb_serial *serial)
2325 {
2326 struct moschip_port *mos7840_port;
2327 struct usb_device *dev;
2328 int i, status;
2329
2330 __u16 Data;
2331 dbg("%s", "mos7840_startup :Entering..........");
2332
2333 if (!serial) {
2334 dbg("%s", "Invalid Handler");
2335 return -1;
2336 }
2337
2338 dev = serial->dev;
2339
2340 dbg("%s", "Entering...");
2341 dbg ("mos7840_startup: serial = %p", serial);
2342
2343 /* we set up the pointers to the endpoints in the mos7840_open *
2344 * function, as the structures aren't created yet. */
2345
2346 /* set up port private structures */
2347 for (i = 0; i < serial->num_ports; ++i) {
2348 dbg ("mos7840_startup: configuring port %d............", i);
2349 mos7840_port = kzalloc(sizeof(struct moschip_port), GFP_KERNEL);
2350 if (mos7840_port == NULL) {
2351 dev_err(&dev->dev, "%s - Out of memory\n", __func__);
2352 status = -ENOMEM;
2353 i--; /* don't follow NULL pointer cleaning up */
2354 goto error;
2355 }
2356
2357 /* Initialize all port interrupt end point to port 0 int
2358 * endpoint. Our device has only one interrupt end point
2359 * common to all port */
2360
2361 mos7840_port->port = serial->port[i];
2362 mos7840_set_port_private(serial->port[i], mos7840_port);
2363 spin_lock_init(&mos7840_port->pool_lock);
2364
2365 /* minor is not initialised until later by
2366 * usb-serial.c:get_free_serial() and cannot therefore be used
2367 * to index device instances */
2368 mos7840_port->port_num = i + 1;
2369 dbg ("serial->port[i]->number = %d", serial->port[i]->number);
2370 dbg ("serial->port[i]->serial->minor = %d", serial->port[i]->serial->minor);
2371 dbg ("mos7840_port->port_num = %d", mos7840_port->port_num);
2372 dbg ("serial->minor = %d", serial->minor);
2373
2374 if (mos7840_port->port_num == 1) {
2375 mos7840_port->SpRegOffset = 0x0;
2376 mos7840_port->ControlRegOffset = 0x1;
2377 mos7840_port->DcrRegOffset = 0x4;
2378 } else if ((mos7840_port->port_num == 2)
2379 && (serial->num_ports == 4)) {
2380 mos7840_port->SpRegOffset = 0x8;
2381 mos7840_port->ControlRegOffset = 0x9;
2382 mos7840_port->DcrRegOffset = 0x16;
2383 } else if ((mos7840_port->port_num == 2)
2384 && (serial->num_ports == 2)) {
2385 mos7840_port->SpRegOffset = 0xa;
2386 mos7840_port->ControlRegOffset = 0xb;
2387 mos7840_port->DcrRegOffset = 0x19;
2388 } else if ((mos7840_port->port_num == 3)
2389 && (serial->num_ports == 4)) {
2390 mos7840_port->SpRegOffset = 0xa;
2391 mos7840_port->ControlRegOffset = 0xb;
2392 mos7840_port->DcrRegOffset = 0x19;
2393 } else if ((mos7840_port->port_num == 4)
2394 && (serial->num_ports == 4)) {
2395 mos7840_port->SpRegOffset = 0xc;
2396 mos7840_port->ControlRegOffset = 0xd;
2397 mos7840_port->DcrRegOffset = 0x1c;
2398 }
2399 mos7840_dump_serial_port(mos7840_port);
2400 mos7840_set_port_private(serial->port[i], mos7840_port);
2401
2402 /* enable rx_disable bit in control register */
2403 status = mos7840_get_reg_sync(serial->port[i],
2404 mos7840_port->ControlRegOffset, &Data);
2405 if (status < 0) {
2406 dbg("Reading ControlReg failed status-0x%x", status);
2407 break;
2408 } else
2409 dbg("ControlReg Reading success val is %x, status%d",
2410 Data, status);
2411 Data |= 0x08; /* setting driver done bit */
2412 Data |= 0x04; /* sp1_bit to have cts change reflect in
2413 modem status reg */
2414
2415 /* Data |= 0x20; //rx_disable bit */
2416 status = mos7840_set_reg_sync(serial->port[i],
2417 mos7840_port->ControlRegOffset, Data);
2418 if (status < 0) {
2419 dbg("Writing ControlReg failed(rx_disable) status-0x%x", status);
2420 break;
2421 } else
2422 dbg("ControlReg Writing success(rx_disable) status%d",
2423 status);
2424
2425 /* Write default values in DCR (i.e 0x01 in DCR0, 0x05 in DCR2
2426 and 0x24 in DCR3 */
2427 Data = 0x01;
2428 status = mos7840_set_reg_sync(serial->port[i],
2429 (__u16) (mos7840_port->DcrRegOffset + 0), Data);
2430 if (status < 0) {
2431 dbg("Writing DCR0 failed status-0x%x", status);
2432 break;
2433 } else
2434 dbg("DCR0 Writing success status%d", status);
2435
2436 Data = 0x05;
2437 status = mos7840_set_reg_sync(serial->port[i],
2438 (__u16) (mos7840_port->DcrRegOffset + 1), Data);
2439 if (status < 0) {
2440 dbg("Writing DCR1 failed status-0x%x", status);
2441 break;
2442 } else
2443 dbg("DCR1 Writing success status%d", status);
2444
2445 Data = 0x24;
2446 status = mos7840_set_reg_sync(serial->port[i],
2447 (__u16) (mos7840_port->DcrRegOffset + 2), Data);
2448 if (status < 0) {
2449 dbg("Writing DCR2 failed status-0x%x", status);
2450 break;
2451 } else
2452 dbg("DCR2 Writing success status%d", status);
2453
2454 /* write values in clkstart0x0 and clkmulti 0x20 */
2455 Data = 0x0;
2456 status = mos7840_set_reg_sync(serial->port[i],
2457 CLK_START_VALUE_REGISTER, Data);
2458 if (status < 0) {
2459 dbg("Writing CLK_START_VALUE_REGISTER failed status-0x%x", status);
2460 break;
2461 } else
2462 dbg("CLK_START_VALUE_REGISTER Writing success status%d", status);
2463
2464 Data = 0x20;
2465 status = mos7840_set_reg_sync(serial->port[i],
2466 CLK_MULTI_REGISTER, Data);
2467 if (status < 0) {
2468 dbg("Writing CLK_MULTI_REGISTER failed status-0x%x",
2469 status);
2470 goto error;
2471 } else
2472 dbg("CLK_MULTI_REGISTER Writing success status%d",
2473 status);
2474
2475 /* write value 0x0 to scratchpad register */
2476 Data = 0x00;
2477 status = mos7840_set_uart_reg(serial->port[i],
2478 SCRATCH_PAD_REGISTER, Data);
2479 if (status < 0) {
2480 dbg("Writing SCRATCH_PAD_REGISTER failed status-0x%x",
2481 status);
2482 break;
2483 } else
2484 dbg("SCRATCH_PAD_REGISTER Writing success status%d",
2485 status);
2486
2487 /* Zero Length flag register */
2488 if ((mos7840_port->port_num != 1)
2489 && (serial->num_ports == 2)) {
2490
2491 Data = 0xff;
2492 status = mos7840_set_reg_sync(serial->port[i],
2493 (__u16) (ZLP_REG1 +
2494 ((__u16)mos7840_port->port_num)), Data);
2495 dbg("ZLIP offset %x",
2496 (__u16) (ZLP_REG1 +
2497 ((__u16) mos7840_port->port_num)));
2498 if (status < 0) {
2499 dbg("Writing ZLP_REG%d failed status-0x%x",
2500 i + 2, status);
2501 break;
2502 } else
2503 dbg("ZLP_REG%d Writing success status%d",
2504 i + 2, status);
2505 } else {
2506 Data = 0xff;
2507 status = mos7840_set_reg_sync(serial->port[i],
2508 (__u16) (ZLP_REG1 +
2509 ((__u16)mos7840_port->port_num) - 0x1), Data);
2510 dbg("ZLIP offset %x",
2511 (__u16) (ZLP_REG1 +
2512 ((__u16) mos7840_port->port_num) - 0x1));
2513 if (status < 0) {
2514 dbg("Writing ZLP_REG%d failed status-0x%x",
2515 i + 1, status);
2516 break;
2517 } else
2518 dbg("ZLP_REG%d Writing success status%d",
2519 i + 1, status);
2520
2521 }
2522 mos7840_port->control_urb = usb_alloc_urb(0, GFP_KERNEL);
2523 mos7840_port->ctrl_buf = kmalloc(16, GFP_KERNEL);
2524 mos7840_port->dr = kmalloc(sizeof(struct usb_ctrlrequest),
2525 GFP_KERNEL);
2526 if (!mos7840_port->control_urb || !mos7840_port->ctrl_buf ||
2527 !mos7840_port->dr) {
2528 status = -ENOMEM;
2529 goto error;
2530 }
2531 }
2532 dbg ("mos7840_startup: all ports configured...........");
2533
2534 /* Zero Length flag enable */
2535 Data = 0x0f;
2536 status = mos7840_set_reg_sync(serial->port[0], ZLP_REG5, Data);
2537 if (status < 0) {
2538 dbg("Writing ZLP_REG5 failed status-0x%x", status);
2539 goto error;
2540 } else
2541 dbg("ZLP_REG5 Writing success status%d", status);
2542
2543 /* setting configuration feature to one */
2544 usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0),
2545 (__u8) 0x03, 0x00, 0x01, 0x00, NULL, 0x00, 5 * HZ);
2546 return 0;
2547 error:
2548 for (/* nothing */; i >= 0; i--) {
2549 mos7840_port = mos7840_get_port_private(serial->port[i]);
2550
2551 kfree(mos7840_port->dr);
2552 kfree(mos7840_port->ctrl_buf);
2553 usb_free_urb(mos7840_port->control_urb);
2554 kfree(mos7840_port);
2555 serial->port[i] = NULL;
2556 }
2557 return status;
2558 }
2559
2560 /****************************************************************************
2561 * mos7840_disconnect
2562 * This function is called whenever the device is removed from the usb bus.
2563 ****************************************************************************/
2564
2565 static void mos7840_disconnect(struct usb_serial *serial)
2566 {
2567 int i;
2568 unsigned long flags;
2569 struct moschip_port *mos7840_port;
2570 dbg("%s", " disconnect :entering..........");
2571
2572 if (!serial) {
2573 dbg("%s", "Invalid Handler");
2574 return;
2575 }
2576
2577 /* check for the ports to be closed,close the ports and disconnect */
2578
2579 /* free private structure allocated for serial port *
2580 * stop reads and writes on all ports */
2581
2582 for (i = 0; i < serial->num_ports; ++i) {
2583 mos7840_port = mos7840_get_port_private(serial->port[i]);
2584 dbg ("mos7840_port %d = %p", i, mos7840_port);
2585 if (mos7840_port) {
2586 spin_lock_irqsave(&mos7840_port->pool_lock, flags);
2587 mos7840_port->zombie = 1;
2588 spin_unlock_irqrestore(&mos7840_port->pool_lock, flags);
2589 usb_kill_urb(mos7840_port->control_urb);
2590 }
2591 }
2592
2593 dbg("%s", "Thank u :: ");
2594
2595 }
2596
2597 /****************************************************************************
2598 * mos7840_release
2599 * This function is called when the usb_serial structure is freed.
2600 ****************************************************************************/
2601
2602 static void mos7840_release(struct usb_serial *serial)
2603 {
2604 int i;
2605 struct moschip_port *mos7840_port;
2606 dbg("%s", " release :entering..........");
2607
2608 if (!serial) {
2609 dbg("%s", "Invalid Handler");
2610 return;
2611 }
2612
2613 /* check for the ports to be closed,close the ports and disconnect */
2614
2615 /* free private structure allocated for serial port *
2616 * stop reads and writes on all ports */
2617
2618 for (i = 0; i < serial->num_ports; ++i) {
2619 mos7840_port = mos7840_get_port_private(serial->port[i]);
2620 dbg("mos7840_port %d = %p", i, mos7840_port);
2621 if (mos7840_port) {
2622 kfree(mos7840_port->ctrl_buf);
2623 kfree(mos7840_port->dr);
2624 kfree(mos7840_port);
2625 }
2626 }
2627
2628 dbg("%s", "Thank u :: ");
2629
2630 }
2631
2632 static struct usb_driver io_driver = {
2633 .name = "mos7840",
2634 .probe = usb_serial_probe,
2635 .disconnect = usb_serial_disconnect,
2636 .id_table = moschip_id_table_combined,
2637 .no_dynamic_id = 1,
2638 };
2639
2640 static struct usb_serial_driver moschip7840_4port_device = {
2641 .driver = {
2642 .owner = THIS_MODULE,
2643 .name = "mos7840",
2644 },
2645 .description = DRIVER_DESC,
2646 .usb_driver = &io_driver,
2647 .id_table = moschip_port_id_table,
2648 .num_ports = 4,
2649 .open = mos7840_open,
2650 .close = mos7840_close,
2651 .write = mos7840_write,
2652 .write_room = mos7840_write_room,
2653 .chars_in_buffer = mos7840_chars_in_buffer,
2654 .throttle = mos7840_throttle,
2655 .unthrottle = mos7840_unthrottle,
2656 .calc_num_ports = mos7840_calc_num_ports,
2657 #ifdef MCSSerialProbe
2658 .probe = mos7840_serial_probe,
2659 #endif
2660 .ioctl = mos7840_ioctl,
2661 .set_termios = mos7840_set_termios,
2662 .break_ctl = mos7840_break,
2663 .tiocmget = mos7840_tiocmget,
2664 .tiocmset = mos7840_tiocmset,
2665 .attach = mos7840_startup,
2666 .disconnect = mos7840_disconnect,
2667 .release = mos7840_release,
2668 .read_bulk_callback = mos7840_bulk_in_callback,
2669 .read_int_callback = mos7840_interrupt_callback,
2670 };
2671
2672 /****************************************************************************
2673 * moschip7840_init
2674 * This is called by the module subsystem, or on startup to initialize us
2675 ****************************************************************************/
2676 static int __init moschip7840_init(void)
2677 {
2678 int retval;
2679
2680 dbg("%s", " mos7840_init :entering..........");
2681
2682 /* Register with the usb serial */
2683 retval = usb_serial_register(&moschip7840_4port_device);
2684
2685 if (retval)
2686 goto failed_port_device_register;
2687
2688 dbg("%s", "Entering...");
2689 printk(KERN_INFO KBUILD_MODNAME ": " DRIVER_VERSION ":"
2690 DRIVER_DESC "\n");
2691
2692 /* Register with the usb */
2693 retval = usb_register(&io_driver);
2694 if (retval == 0) {
2695 dbg("%s", "Leaving...");
2696 return 0;
2697 }
2698 usb_serial_deregister(&moschip7840_4port_device);
2699 failed_port_device_register:
2700 return retval;
2701 }
2702
2703 /****************************************************************************
2704 * moschip7840_exit
2705 * Called when the driver is about to be unloaded.
2706 ****************************************************************************/
2707 static void __exit moschip7840_exit(void)
2708 {
2709
2710 dbg("%s", " mos7840_exit :entering..........");
2711
2712 usb_deregister(&io_driver);
2713
2714 usb_serial_deregister(&moschip7840_4port_device);
2715
2716 dbg("%s", "Entering...");
2717 }
2718
2719 module_init(moschip7840_init);
2720 module_exit(moschip7840_exit);
2721
2722 /* Module information */
2723 MODULE_DESCRIPTION(DRIVER_DESC);
2724 MODULE_LICENSE("GPL");
2725
2726 module_param(debug, bool, S_IRUGO | S_IWUSR);
2727 MODULE_PARM_DESC(debug, "Debug enabled or not");
Linux 2.6 ibm-acpi/thinkpad-acpi driver git tree