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USB: serial/mos*: prevent reading uninitialized stack memory
[linux-2.6/linux-acpi-2.6/ibm-acpi-2.6.git] / drivers / usb / serial / mos7840.c
blob9fdcee2eca99c3941f2bc92f83c7045d35e2a92c
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_2P 0xBC00
126 #define BANDB_DEVICE_ID_USO9ML2_4 0xAC24
127 #define BANDB_DEVICE_ID_USO9ML2_4P 0xBC01
128 #define BANDB_DEVICE_ID_US9ML2_2 0xAC29
129 #define BANDB_DEVICE_ID_US9ML2_4 0xAC30
130 #define BANDB_DEVICE_ID_USPTL4_2 0xAC31
131 #define BANDB_DEVICE_ID_USPTL4_4 0xAC32
132 #define BANDB_DEVICE_ID_USOPTL4_2 0xAC42
133 #define BANDB_DEVICE_ID_USOPTL4_2P 0xBC02
134 #define BANDB_DEVICE_ID_USOPTL4_4 0xAC44
135 #define BANDB_DEVICE_ID_USOPTL4_4P 0xBC03
136 #define BANDB_DEVICE_ID_USOPTL2_4 0xAC24
137
138 /* This driver also supports
139 * ATEN UC2324 device using Moschip MCS7840
140 * ATEN UC2322 device using Moschip MCS7820
141 */
142 #define USB_VENDOR_ID_ATENINTL 0x0557
143 #define ATENINTL_DEVICE_ID_UC2324 0x2011
144 #define ATENINTL_DEVICE_ID_UC2322 0x7820
145
146 /* Interrupt Routine Defines */
147
148 #define SERIAL_IIR_RLS 0x06
149 #define SERIAL_IIR_MS 0x00
150
151 /*
152 * Emulation of the bit mask on the LINE STATUS REGISTER.
153 */
154 #define SERIAL_LSR_DR 0x0001
155 #define SERIAL_LSR_OE 0x0002
156 #define SERIAL_LSR_PE 0x0004
157 #define SERIAL_LSR_FE 0x0008
158 #define SERIAL_LSR_BI 0x0010
159
160 #define MOS_MSR_DELTA_CTS 0x10
161 #define MOS_MSR_DELTA_DSR 0x20
162 #define MOS_MSR_DELTA_RI 0x40
163 #define MOS_MSR_DELTA_CD 0x80
164
165 /* Serial Port register Address */
166 #define INTERRUPT_ENABLE_REGISTER ((__u16)(0x01))
167 #define FIFO_CONTROL_REGISTER ((__u16)(0x02))
168 #define LINE_CONTROL_REGISTER ((__u16)(0x03))
169 #define MODEM_CONTROL_REGISTER ((__u16)(0x04))
170 #define LINE_STATUS_REGISTER ((__u16)(0x05))
171 #define MODEM_STATUS_REGISTER ((__u16)(0x06))
172 #define SCRATCH_PAD_REGISTER ((__u16)(0x07))
173 #define DIVISOR_LATCH_LSB ((__u16)(0x00))
174 #define DIVISOR_LATCH_MSB ((__u16)(0x01))
175
176 #define CLK_MULTI_REGISTER ((__u16)(0x02))
177 #define CLK_START_VALUE_REGISTER ((__u16)(0x03))
178
179 #define SERIAL_LCR_DLAB ((__u16)(0x0080))
180
181 /*
182 * URB POOL related defines
183 */
184 #define NUM_URBS 16 /* URB Count */
185 #define URB_TRANSFER_BUFFER_SIZE 32 /* URB Size */
186
187
188 static struct usb_device_id moschip_port_id_table[] = {
189 {USB_DEVICE(USB_VENDOR_ID_MOSCHIP, MOSCHIP_DEVICE_ID_7840)},
190 {USB_DEVICE(USB_VENDOR_ID_MOSCHIP, MOSCHIP_DEVICE_ID_7820)},
191 {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USO9ML2_2)},
192 {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USO9ML2_2P)},
193 {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USO9ML2_4)},
194 {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USO9ML2_4P)},
195 {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_US9ML2_2)},
196 {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_US9ML2_4)},
197 {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USPTL4_2)},
198 {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USPTL4_4)},
199 {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USOPTL4_2)},
200 {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USOPTL4_2P)},
201 {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USOPTL4_4)},
202 {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USOPTL4_4P)},
203 {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USOPTL2_4)},
204 {USB_DEVICE(USB_VENDOR_ID_ATENINTL, ATENINTL_DEVICE_ID_UC2324)},
205 {USB_DEVICE(USB_VENDOR_ID_ATENINTL, ATENINTL_DEVICE_ID_UC2322)},
206 {} /* terminating entry */
207 };
208
209 static __devinitdata struct usb_device_id moschip_id_table_combined[] = {
210 {USB_DEVICE(USB_VENDOR_ID_MOSCHIP, MOSCHIP_DEVICE_ID_7840)},
211 {USB_DEVICE(USB_VENDOR_ID_MOSCHIP, MOSCHIP_DEVICE_ID_7820)},
212 {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USO9ML2_2)},
213 {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USO9ML2_2P)},
214 {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USO9ML2_4)},
215 {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USO9ML2_4P)},
216 {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_US9ML2_2)},
217 {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_US9ML2_4)},
218 {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USPTL4_2)},
219 {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USPTL4_4)},
220 {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USOPTL4_2)},
221 {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USOPTL4_2P)},
222 {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USOPTL4_4)},
223 {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USOPTL4_4P)},
224 {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USOPTL2_4)},
225 {USB_DEVICE(USB_VENDOR_ID_ATENINTL, ATENINTL_DEVICE_ID_UC2324)},
226 {USB_DEVICE(USB_VENDOR_ID_ATENINTL, ATENINTL_DEVICE_ID_UC2322)},
227 {} /* terminating entry */
228 };
229
230 MODULE_DEVICE_TABLE(usb, moschip_id_table_combined);
231
232 /* This structure holds all of the local port information */
233
234 struct moschip_port {
235 int port_num; /*Actual port number in the device(1,2,etc) */
236 struct urb *write_urb; /* write URB for this port */
237 struct urb *read_urb; /* read URB for this port */
238 struct urb *int_urb;
239 __u8 shadowLCR; /* last LCR value received */
240 __u8 shadowMCR; /* last MCR value received */
241 char open;
242 char open_ports;
243 char zombie;
244 wait_queue_head_t wait_chase; /* for handling sleeping while waiting for chase to finish */
245 wait_queue_head_t delta_msr_wait; /* for handling sleeping while waiting for msr change to happen */
246 int delta_msr_cond;
247 struct async_icount icount;
248 struct usb_serial_port *port; /* loop back to the owner of this object */
249
250 /* Offsets */
251 __u8 SpRegOffset;
252 __u8 ControlRegOffset;
253 __u8 DcrRegOffset;
254 /* for processing control URBS in interrupt context */
255 struct urb *control_urb;
256 struct usb_ctrlrequest *dr;
257 char *ctrl_buf;
258 int MsrLsr;
259
260 spinlock_t pool_lock;
261 struct urb *write_urb_pool[NUM_URBS];
262 char busy[NUM_URBS];
263 bool read_urb_busy;
264 };
265
266
267 static int debug;
268
269 /*
270 * mos7840_set_reg_sync
271 * To set the Control register by calling usb_fill_control_urb function
272 * by passing usb_sndctrlpipe function as parameter.
273 */
274
275 static int mos7840_set_reg_sync(struct usb_serial_port *port, __u16 reg,
276 __u16 val)
277 {
278 struct usb_device *dev = port->serial->dev;
279 val = val & 0x00ff;
280 dbg("mos7840_set_reg_sync offset is %x, value %x", reg, val);
281
282 return usb_control_msg(dev, usb_sndctrlpipe(dev, 0), MCS_WRREQ,
283 MCS_WR_RTYPE, val, reg, NULL, 0,
284 MOS_WDR_TIMEOUT);
285 }
286
287 /*
288 * mos7840_get_reg_sync
289 * To set the Uart register by calling usb_fill_control_urb function by
290 * passing usb_rcvctrlpipe function as parameter.
291 */
292
293 static int mos7840_get_reg_sync(struct usb_serial_port *port, __u16 reg,
294 __u16 *val)
295 {
296 struct usb_device *dev = port->serial->dev;
297 int ret = 0;
298 u8 *buf;
299
300 buf = kmalloc(VENDOR_READ_LENGTH, GFP_KERNEL);
301 if (!buf)
302 return -ENOMEM;
303
304 ret = usb_control_msg(dev, usb_rcvctrlpipe(dev, 0), MCS_RDREQ,
305 MCS_RD_RTYPE, 0, reg, buf, VENDOR_READ_LENGTH,
306 MOS_WDR_TIMEOUT);
307 *val = buf[0];
308 dbg("mos7840_get_reg_sync offset is %x, return val %x", reg, *val);
309
310 kfree(buf);
311 return ret;
312 }
313
314 /*
315 * mos7840_set_uart_reg
316 * To set the Uart register by calling usb_fill_control_urb function by
317 * passing usb_sndctrlpipe function as parameter.
318 */
319
320 static int mos7840_set_uart_reg(struct usb_serial_port *port, __u16 reg,
321 __u16 val)
322 {
323
324 struct usb_device *dev = port->serial->dev;
325 val = val & 0x00ff;
326 /* For the UART control registers, the application number need
327 to be Or'ed */
328 if (port->serial->num_ports == 4) {
329 val |= (((__u16) port->number -
330 (__u16) (port->serial->minor)) + 1) << 8;
331 dbg("mos7840_set_uart_reg application number is %x", val);
332 } else {
333 if (((__u16) port->number - (__u16) (port->serial->minor)) == 0) {
334 val |= (((__u16) port->number -
335 (__u16) (port->serial->minor)) + 1) << 8;
336 dbg("mos7840_set_uart_reg application number is %x",
337 val);
338 } else {
339 val |=
340 (((__u16) port->number -
341 (__u16) (port->serial->minor)) + 2) << 8;
342 dbg("mos7840_set_uart_reg application number is %x",
343 val);
344 }
345 }
346 return usb_control_msg(dev, usb_sndctrlpipe(dev, 0), MCS_WRREQ,
347 MCS_WR_RTYPE, val, reg, NULL, 0,
348 MOS_WDR_TIMEOUT);
349
350 }
351
352 /*
353 * mos7840_get_uart_reg
354 * To set the Control register by calling usb_fill_control_urb function
355 * by passing usb_rcvctrlpipe function as parameter.
356 */
357 static int mos7840_get_uart_reg(struct usb_serial_port *port, __u16 reg,
358 __u16 *val)
359 {
360 struct usb_device *dev = port->serial->dev;
361 int ret = 0;
362 __u16 Wval;
363 u8 *buf;
364
365 buf = kmalloc(VENDOR_READ_LENGTH, GFP_KERNEL);
366 if (!buf)
367 return -ENOMEM;
368
369 /* dbg("application number is %4x",
370 (((__u16)port->number - (__u16)(port->serial->minor))+1)<<8); */
371 /* Wval is same as application number */
372 if (port->serial->num_ports == 4) {
373 Wval =
374 (((__u16) port->number - (__u16) (port->serial->minor)) +
375 1) << 8;
376 dbg("mos7840_get_uart_reg application number is %x", Wval);
377 } else {
378 if (((__u16) port->number - (__u16) (port->serial->minor)) == 0) {
379 Wval = (((__u16) port->number -
380 (__u16) (port->serial->minor)) + 1) << 8;
381 dbg("mos7840_get_uart_reg application number is %x",
382 Wval);
383 } else {
384 Wval = (((__u16) port->number -
385 (__u16) (port->serial->minor)) + 2) << 8;
386 dbg("mos7840_get_uart_reg application number is %x",
387 Wval);
388 }
389 }
390 ret = usb_control_msg(dev, usb_rcvctrlpipe(dev, 0), MCS_RDREQ,
391 MCS_RD_RTYPE, Wval, reg, buf, VENDOR_READ_LENGTH,
392 MOS_WDR_TIMEOUT);
393 *val = buf[0];
394
395 kfree(buf);
396 return ret;
397 }
398
399 static void mos7840_dump_serial_port(struct moschip_port *mos7840_port)
400 {
401
402 dbg("***************************************");
403 dbg("SpRegOffset is %2x", mos7840_port->SpRegOffset);
404 dbg("ControlRegOffset is %2x", mos7840_port->ControlRegOffset);
405 dbg("DCRRegOffset is %2x", mos7840_port->DcrRegOffset);
406 dbg("***************************************");
407
408 }
409
410 /************************************************************************/
411 /************************************************************************/
412 /* I N T E R F A C E F U N C T I O N S */
413 /* I N T E R F A C E F U N C T I O N S */
414 /************************************************************************/
415 /************************************************************************/
416
417 static inline void mos7840_set_port_private(struct usb_serial_port *port,
418 struct moschip_port *data)
419 {
420 usb_set_serial_port_data(port, (void *)data);
421 }
422
423 static inline struct moschip_port *mos7840_get_port_private(struct
424 usb_serial_port
425 *port)
426 {
427 return (struct moschip_port *)usb_get_serial_port_data(port);
428 }
429
430 static void mos7840_handle_new_msr(struct moschip_port *port, __u8 new_msr)
431 {
432 struct moschip_port *mos7840_port;
433 struct async_icount *icount;
434 mos7840_port = port;
435 icount = &mos7840_port->icount;
436 if (new_msr &
437 (MOS_MSR_DELTA_CTS | MOS_MSR_DELTA_DSR | MOS_MSR_DELTA_RI |
438 MOS_MSR_DELTA_CD)) {
439 icount = &mos7840_port->icount;
440
441 /* update input line counters */
442 if (new_msr & MOS_MSR_DELTA_CTS) {
443 icount->cts++;
444 smp_wmb();
445 }
446 if (new_msr & MOS_MSR_DELTA_DSR) {
447 icount->dsr++;
448 smp_wmb();
449 }
450 if (new_msr & MOS_MSR_DELTA_CD) {
451 icount->dcd++;
452 smp_wmb();
453 }
454 if (new_msr & MOS_MSR_DELTA_RI) {
455 icount->rng++;
456 smp_wmb();
457 }
458 }
459 }
460
461 static void mos7840_handle_new_lsr(struct moschip_port *port, __u8 new_lsr)
462 {
463 struct async_icount *icount;
464
465 dbg("%s - %02x", __func__, new_lsr);
466
467 if (new_lsr & SERIAL_LSR_BI) {
468 /*
469 * Parity and Framing errors only count if they
470 * occur exclusive of a break being
471 * received.
472 */
473 new_lsr &= (__u8) (SERIAL_LSR_OE | SERIAL_LSR_BI);
474 }
475
476 /* update input line counters */
477 icount = &port->icount;
478 if (new_lsr & SERIAL_LSR_BI) {
479 icount->brk++;
480 smp_wmb();
481 }
482 if (new_lsr & SERIAL_LSR_OE) {
483 icount->overrun++;
484 smp_wmb();
485 }
486 if (new_lsr & SERIAL_LSR_PE) {
487 icount->parity++;
488 smp_wmb();
489 }
490 if (new_lsr & SERIAL_LSR_FE) {
491 icount->frame++;
492 smp_wmb();
493 }
494 }
495
496 /************************************************************************/
497 /************************************************************************/
498 /* U S B C A L L B A C K F U N C T I O N S */
499 /* U S B C A L L B A C K F U N C T I O N S */
500 /************************************************************************/
501 /************************************************************************/
502
503 static void mos7840_control_callback(struct urb *urb)
504 {
505 unsigned char *data;
506 struct moschip_port *mos7840_port;
507 __u8 regval = 0x0;
508 int result = 0;
509 int status = urb->status;
510
511 mos7840_port = urb->context;
512
513 switch (status) {
514 case 0:
515 /* success */
516 break;
517 case -ECONNRESET:
518 case -ENOENT:
519 case -ESHUTDOWN:
520 /* this urb is terminated, clean up */
521 dbg("%s - urb shutting down with status: %d", __func__,
522 status);
523 return;
524 default:
525 dbg("%s - nonzero urb status received: %d", __func__,
526 status);
527 goto exit;
528 }
529
530 dbg("%s urb buffer size is %d", __func__, urb->actual_length);
531 dbg("%s mos7840_port->MsrLsr is %d port %d", __func__,
532 mos7840_port->MsrLsr, mos7840_port->port_num);
533 data = urb->transfer_buffer;
534 regval = (__u8) data[0];
535 dbg("%s data is %x", __func__, regval);
536 if (mos7840_port->MsrLsr == 0)
537 mos7840_handle_new_msr(mos7840_port, regval);
538 else if (mos7840_port->MsrLsr == 1)
539 mos7840_handle_new_lsr(mos7840_port, regval);
540
541 exit:
542 spin_lock(&mos7840_port->pool_lock);
543 if (!mos7840_port->zombie)
544 result = usb_submit_urb(mos7840_port->int_urb, GFP_ATOMIC);
545 spin_unlock(&mos7840_port->pool_lock);
546 if (result) {
547 dev_err(&urb->dev->dev,
548 "%s - Error %d submitting interrupt urb\n",
549 __func__, result);
550 }
551 }
552
553 static int mos7840_get_reg(struct moschip_port *mcs, __u16 Wval, __u16 reg,
554 __u16 *val)
555 {
556 struct usb_device *dev = mcs->port->serial->dev;
557 struct usb_ctrlrequest *dr = mcs->dr;
558 unsigned char *buffer = mcs->ctrl_buf;
559 int ret;
560
561 dr->bRequestType = MCS_RD_RTYPE;
562 dr->bRequest = MCS_RDREQ;
563 dr->wValue = cpu_to_le16(Wval); /* 0 */
564 dr->wIndex = cpu_to_le16(reg);
565 dr->wLength = cpu_to_le16(2);
566
567 usb_fill_control_urb(mcs->control_urb, dev, usb_rcvctrlpipe(dev, 0),
568 (unsigned char *)dr, buffer, 2,
569 mos7840_control_callback, mcs);
570 mcs->control_urb->transfer_buffer_length = 2;
571 ret = usb_submit_urb(mcs->control_urb, GFP_ATOMIC);
572 return ret;
573 }
574
575 /*****************************************************************************
576 * mos7840_interrupt_callback
577 * this is the callback function for when we have received data on the
578 * interrupt endpoint.
579 *****************************************************************************/
580
581 static void mos7840_interrupt_callback(struct urb *urb)
582 {
583 int result;
584 int length;
585 struct moschip_port *mos7840_port;
586 struct usb_serial *serial;
587 __u16 Data;
588 unsigned char *data;
589 __u8 sp[5], st;
590 int i, rv = 0;
591 __u16 wval, wreg = 0;
592 int status = urb->status;
593
594 dbg("%s", " : Entering");
595
596 switch (status) {
597 case 0:
598 /* success */
599 break;
600 case -ECONNRESET:
601 case -ENOENT:
602 case -ESHUTDOWN:
603 /* this urb is terminated, clean up */
604 dbg("%s - urb shutting down with status: %d", __func__,
605 status);
606 return;
607 default:
608 dbg("%s - nonzero urb status received: %d", __func__,
609 status);
610 goto exit;
611 }
612
613 length = urb->actual_length;
614 data = urb->transfer_buffer;
615
616 serial = urb->context;
617
618 /* Moschip get 5 bytes
619 * Byte 1 IIR Port 1 (port.number is 0)
620 * Byte 2 IIR Port 2 (port.number is 1)
621 * Byte 3 IIR Port 3 (port.number is 2)
622 * Byte 4 IIR Port 4 (port.number is 3)
623 * Byte 5 FIFO status for both */
624
625 if (length && length > 5) {
626 dbg("%s", "Wrong data !!!");
627 return;
628 }
629
630 sp[0] = (__u8) data[0];
631 sp[1] = (__u8) data[1];
632 sp[2] = (__u8) data[2];
633 sp[3] = (__u8) data[3];
634 st = (__u8) data[4];
635
636 for (i = 0; i < serial->num_ports; i++) {
637 mos7840_port = mos7840_get_port_private(serial->port[i]);
638 wval =
639 (((__u16) serial->port[i]->number -
640 (__u16) (serial->minor)) + 1) << 8;
641 if (mos7840_port->open) {
642 if (sp[i] & 0x01) {
643 dbg("SP%d No Interrupt !!!", i);
644 } else {
645 switch (sp[i] & 0x0f) {
646 case SERIAL_IIR_RLS:
647 dbg("Serial Port %d: Receiver status error or ", i);
648 dbg("address bit detected in 9-bit mode");
649 mos7840_port->MsrLsr = 1;
650 wreg = LINE_STATUS_REGISTER;
651 break;
652 case SERIAL_IIR_MS:
653 dbg("Serial Port %d: Modem status change", i);
654 mos7840_port->MsrLsr = 0;
655 wreg = MODEM_STATUS_REGISTER;
656 break;
657 }
658 spin_lock(&mos7840_port->pool_lock);
659 if (!mos7840_port->zombie) {
660 rv = mos7840_get_reg(mos7840_port, wval, wreg, &Data);
661 } else {
662 spin_unlock(&mos7840_port->pool_lock);
663 return;
664 }
665 spin_unlock(&mos7840_port->pool_lock);
666 }
667 }
668 }
669 if (!(rv < 0))
670 /* the completion handler for the control urb will resubmit */
671 return;
672 exit:
673 result = usb_submit_urb(urb, GFP_ATOMIC);
674 if (result) {
675 dev_err(&urb->dev->dev,
676 "%s - Error %d submitting interrupt urb\n",
677 __func__, result);
678 }
679 }
680
681 static int mos7840_port_paranoia_check(struct usb_serial_port *port,
682 const char *function)
683 {
684 if (!port) {
685 dbg("%s - port == NULL", function);
686 return -1;
687 }
688 if (!port->serial) {
689 dbg("%s - port->serial == NULL", function);
690 return -1;
691 }
692
693 return 0;
694 }
695
696 /* Inline functions to check the sanity of a pointer that is passed to us */
697 static int mos7840_serial_paranoia_check(struct usb_serial *serial,
698 const char *function)
699 {
700 if (!serial) {
701 dbg("%s - serial == NULL", function);
702 return -1;
703 }
704 if (!serial->type) {
705 dbg("%s - serial->type == NULL!", function);
706 return -1;
707 }
708
709 return 0;
710 }
711
712 static struct usb_serial *mos7840_get_usb_serial(struct usb_serial_port *port,
713 const char *function)
714 {
715 /* if no port was specified, or it fails a paranoia check */
716 if (!port ||
717 mos7840_port_paranoia_check(port, function) ||
718 mos7840_serial_paranoia_check(port->serial, function)) {
719 /* then say that we don't have a valid usb_serial thing,
720 * which will end up genrating -ENODEV return values */
721 return NULL;
722 }
723
724 return port->serial;
725 }
726
727 /*****************************************************************************
728 * mos7840_bulk_in_callback
729 * this is the callback function for when we have received data on the
730 * bulk in endpoint.
731 *****************************************************************************/
732
733 static void mos7840_bulk_in_callback(struct urb *urb)
734 {
735 int retval;
736 unsigned char *data;
737 struct usb_serial *serial;
738 struct usb_serial_port *port;
739 struct moschip_port *mos7840_port;
740 struct tty_struct *tty;
741 int status = urb->status;
742
743 mos7840_port = urb->context;
744 if (!mos7840_port) {
745 dbg("%s", "NULL mos7840_port pointer");
746 return;
747 }
748
749 if (status) {
750 dbg("nonzero read bulk status received: %d", status);
751 mos7840_port->read_urb_busy = false;
752 return;
753 }
754
755 port = (struct usb_serial_port *)mos7840_port->port;
756 if (mos7840_port_paranoia_check(port, __func__)) {
757 dbg("%s", "Port Paranoia failed");
758 mos7840_port->read_urb_busy = false;
759 return;
760 }
761
762 serial = mos7840_get_usb_serial(port, __func__);
763 if (!serial) {
764 dbg("%s", "Bad serial pointer");
765 mos7840_port->read_urb_busy = false;
766 return;
767 }
768
769 dbg("%s", "Entering... ");
770
771 data = urb->transfer_buffer;
772
773 dbg("%s", "Entering ...........");
774
775 if (urb->actual_length) {
776 tty = tty_port_tty_get(&mos7840_port->port->port);
777 if (tty) {
778 tty_buffer_request_room(tty, urb->actual_length);
779 tty_insert_flip_string(tty, data, urb->actual_length);
780 dbg(" %s ", data);
781 tty_flip_buffer_push(tty);
782 tty_kref_put(tty);
783 }
784 mos7840_port->icount.rx += urb->actual_length;
785 smp_wmb();
786 dbg("mos7840_port->icount.rx is %d:",
787 mos7840_port->icount.rx);
788 }
789
790 if (!mos7840_port->read_urb) {
791 dbg("%s", "URB KILLED !!!");
792 mos7840_port->read_urb_busy = false;
793 return;
794 }
795
796
797 mos7840_port->read_urb->dev = serial->dev;
798
799 mos7840_port->read_urb_busy = true;
800 retval = usb_submit_urb(mos7840_port->read_urb, GFP_ATOMIC);
801
802 if (retval) {
803 dbg("usb_submit_urb(read bulk) failed, retval = %d", retval);
804 mos7840_port->read_urb_busy = false;
805 }
806 }
807
808 /*****************************************************************************
809 * mos7840_bulk_out_data_callback
810 * this is the callback function for when we have finished sending
811 * serial data on the bulk out endpoint.
812 *****************************************************************************/
813
814 static void mos7840_bulk_out_data_callback(struct urb *urb)
815 {
816 struct moschip_port *mos7840_port;
817 struct tty_struct *tty;
818 int status = urb->status;
819 int i;
820
821 mos7840_port = urb->context;
822 spin_lock(&mos7840_port->pool_lock);
823 for (i = 0; i < NUM_URBS; i++) {
824 if (urb == mos7840_port->write_urb_pool[i]) {
825 mos7840_port->busy[i] = 0;
826 break;
827 }
828 }
829 spin_unlock(&mos7840_port->pool_lock);
830
831 if (status) {
832 dbg("nonzero write bulk status received:%d", status);
833 return;
834 }
835
836 if (mos7840_port_paranoia_check(mos7840_port->port, __func__)) {
837 dbg("%s", "Port Paranoia failed");
838 return;
839 }
840
841 dbg("%s", "Entering .........");
842
843 tty = tty_port_tty_get(&mos7840_port->port->port);
844 if (tty && mos7840_port->open)
845 tty_wakeup(tty);
846 tty_kref_put(tty);
847
848 }
849
850 /************************************************************************/
851 /* 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 */
852 /************************************************************************/
853 #ifdef MCSSerialProbe
854 static int mos7840_serial_probe(struct usb_serial *serial,
855 const struct usb_device_id *id)
856 {
857
858 /*need to implement the mode_reg reading and updating\
859 structures usb_serial_ device_type\
860 (i.e num_ports, num_bulkin,bulkout etc) */
861 /* Also we can update the changes attach */
862 return 1;
863 }
864 #endif
865
866 /*****************************************************************************
867 * mos7840_open
868 * this function is called by the tty driver when a port is opened
869 * If successful, we return 0
870 * Otherwise we return a negative error number.
871 *****************************************************************************/
872
873 static int mos7840_open(struct tty_struct *tty, struct usb_serial_port *port)
874 {
875 int response;
876 int j;
877 struct usb_serial *serial;
878 struct urb *urb;
879 __u16 Data;
880 int status;
881 struct moschip_port *mos7840_port;
882 struct moschip_port *port0;
883
884 dbg ("%s enter", __func__);
885
886 if (mos7840_port_paranoia_check(port, __func__)) {
887 dbg("%s", "Port Paranoia failed");
888 return -ENODEV;
889 }
890
891 serial = port->serial;
892
893 if (mos7840_serial_paranoia_check(serial, __func__)) {
894 dbg("%s", "Serial Paranoia failed");
895 return -ENODEV;
896 }
897
898 mos7840_port = mos7840_get_port_private(port);
899 port0 = mos7840_get_port_private(serial->port[0]);
900
901 if (mos7840_port == NULL || port0 == NULL)
902 return -ENODEV;
903
904 usb_clear_halt(serial->dev, port->write_urb->pipe);
905 usb_clear_halt(serial->dev, port->read_urb->pipe);
906 port0->open_ports++;
907
908 /* Initialising the write urb pool */
909 for (j = 0; j < NUM_URBS; ++j) {
910 urb = usb_alloc_urb(0, GFP_KERNEL);
911 mos7840_port->write_urb_pool[j] = urb;
912
913 if (urb == NULL) {
914 dev_err(&port->dev, "No more urbs???\n");
915 continue;
916 }
917
918 urb->transfer_buffer = kmalloc(URB_TRANSFER_BUFFER_SIZE,
919 GFP_KERNEL);
920 if (!urb->transfer_buffer) {
921 usb_free_urb(urb);
922 mos7840_port->write_urb_pool[j] = NULL;
923 dev_err(&port->dev,
924 "%s-out of memory for urb buffers.\n",
925 __func__);
926 continue;
927 }
928 }
929
930 /*****************************************************************************
931 * Initialize MCS7840 -- Write Init values to corresponding Registers
932 *
933 * Register Index
934 * 1 : IER
935 * 2 : FCR
936 * 3 : LCR
937 * 4 : MCR
938 *
939 * 0x08 : SP1/2 Control Reg
940 *****************************************************************************/
941
942 /* NEED to check the following Block */
943
944 Data = 0x0;
945 status = mos7840_get_reg_sync(port, mos7840_port->SpRegOffset, &Data);
946 if (status < 0) {
947 dbg("Reading Spreg failed");
948 return -1;
949 }
950 Data |= 0x80;
951 status = mos7840_set_reg_sync(port, mos7840_port->SpRegOffset, Data);
952 if (status < 0) {
953 dbg("writing Spreg failed");
954 return -1;
955 }
956
957 Data &= ~0x80;
958 status = mos7840_set_reg_sync(port, mos7840_port->SpRegOffset, Data);
959 if (status < 0) {
960 dbg("writing Spreg failed");
961 return -1;
962 }
963 /* End of block to be checked */
964
965 Data = 0x0;
966 status = mos7840_get_reg_sync(port, mos7840_port->ControlRegOffset,
967 &Data);
968 if (status < 0) {
969 dbg("Reading Controlreg failed");
970 return -1;
971 }
972 Data |= 0x08; /* Driver done bit */
973 Data |= 0x20; /* rx_disable */
974 status = mos7840_set_reg_sync(port,
975 mos7840_port->ControlRegOffset, Data);
976 if (status < 0) {
977 dbg("writing Controlreg failed");
978 return -1;
979 }
980 /* do register settings here */
981 /* Set all regs to the device default values. */
982 /***********************************
983 * First Disable all interrupts.
984 ***********************************/
985 Data = 0x00;
986 status = mos7840_set_uart_reg(port, INTERRUPT_ENABLE_REGISTER, Data);
987 if (status < 0) {
988 dbg("disabling interrupts failed");
989 return -1;
990 }
991 /* Set FIFO_CONTROL_REGISTER to the default value */
992 Data = 0x00;
993 status = mos7840_set_uart_reg(port, FIFO_CONTROL_REGISTER, Data);
994 if (status < 0) {
995 dbg("Writing FIFO_CONTROL_REGISTER failed");
996 return -1;
997 }
998
999 Data = 0xcf;
1000 status = mos7840_set_uart_reg(port, FIFO_CONTROL_REGISTER, Data);
1001 if (status < 0) {
1002 dbg("Writing FIFO_CONTROL_REGISTER failed");
1003 return -1;
1004 }
1005
1006 Data = 0x03;
1007 status = mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data);
1008 mos7840_port->shadowLCR = Data;
1009
1010 Data = 0x0b;
1011 status = mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER, Data);
1012 mos7840_port->shadowMCR = Data;
1013
1014 Data = 0x00;
1015 status = mos7840_get_uart_reg(port, LINE_CONTROL_REGISTER, &Data);
1016 mos7840_port->shadowLCR = Data;
1017
1018 Data |= SERIAL_LCR_DLAB; /* data latch enable in LCR 0x80 */
1019 status = mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data);
1020
1021 Data = 0x0c;
1022 status = mos7840_set_uart_reg(port, DIVISOR_LATCH_LSB, Data);
1023
1024 Data = 0x0;
1025 status = mos7840_set_uart_reg(port, DIVISOR_LATCH_MSB, Data);
1026
1027 Data = 0x00;
1028 status = mos7840_get_uart_reg(port, LINE_CONTROL_REGISTER, &Data);
1029
1030 Data = Data & ~SERIAL_LCR_DLAB;
1031 status = mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data);
1032 mos7840_port->shadowLCR = Data;
1033
1034 /* clearing Bulkin and Bulkout Fifo */
1035 Data = 0x0;
1036 status = mos7840_get_reg_sync(port, mos7840_port->SpRegOffset, &Data);
1037
1038 Data = Data | 0x0c;
1039 status = mos7840_set_reg_sync(port, mos7840_port->SpRegOffset, Data);
1040
1041 Data = Data & ~0x0c;
1042 status = mos7840_set_reg_sync(port, mos7840_port->SpRegOffset, Data);
1043 /* Finally enable all interrupts */
1044 Data = 0x0c;
1045 status = mos7840_set_uart_reg(port, INTERRUPT_ENABLE_REGISTER, Data);
1046
1047 /* clearing rx_disable */
1048 Data = 0x0;
1049 status = mos7840_get_reg_sync(port, mos7840_port->ControlRegOffset,
1050 &Data);
1051 Data = Data & ~0x20;
1052 status = mos7840_set_reg_sync(port, mos7840_port->ControlRegOffset,
1053 Data);
1054
1055 /* rx_negate */
1056 Data = 0x0;
1057 status = mos7840_get_reg_sync(port, mos7840_port->ControlRegOffset,
1058 &Data);
1059 Data = Data | 0x10;
1060 status = mos7840_set_reg_sync(port, mos7840_port->ControlRegOffset,
1061 Data);
1062
1063 /* Check to see if we've set up our endpoint info yet *
1064 * (can't set it up in mos7840_startup as the structures *
1065 * were not set up at that time.) */
1066 if (port0->open_ports == 1) {
1067 if (serial->port[0]->interrupt_in_buffer == NULL) {
1068 /* set up interrupt urb */
1069 usb_fill_int_urb(serial->port[0]->interrupt_in_urb,
1070 serial->dev,
1071 usb_rcvintpipe(serial->dev,
1072 serial->port[0]->interrupt_in_endpointAddress),
1073 serial->port[0]->interrupt_in_buffer,
1074 serial->port[0]->interrupt_in_urb->
1075 transfer_buffer_length,
1076 mos7840_interrupt_callback,
1077 serial,
1078 serial->port[0]->interrupt_in_urb->interval);
1079
1080 /* start interrupt read for mos7840 *
1081 * will continue as long as mos7840 is connected */
1082
1083 response =
1084 usb_submit_urb(serial->port[0]->interrupt_in_urb,
1085 GFP_KERNEL);
1086 if (response) {
1087 dev_err(&port->dev, "%s - Error %d submitting "
1088 "interrupt urb\n", __func__, response);
1089 }
1090
1091 }
1092
1093 }
1094
1095 /* see if we've set up our endpoint info yet *
1096 * (can't set it up in mos7840_startup as the *
1097 * structures were not set up at that time.) */
1098
1099 dbg("port number is %d", port->number);
1100 dbg("serial number is %d", port->serial->minor);
1101 dbg("Bulkin endpoint is %d", port->bulk_in_endpointAddress);
1102 dbg("BulkOut endpoint is %d", port->bulk_out_endpointAddress);
1103 dbg("Interrupt endpoint is %d", port->interrupt_in_endpointAddress);
1104 dbg("port's number in the device is %d", mos7840_port->port_num);
1105 mos7840_port->read_urb = port->read_urb;
1106
1107 /* set up our bulk in urb */
1108
1109 usb_fill_bulk_urb(mos7840_port->read_urb,
1110 serial->dev,
1111 usb_rcvbulkpipe(serial->dev,
1112 port->bulk_in_endpointAddress),
1113 port->bulk_in_buffer,
1114 mos7840_port->read_urb->transfer_buffer_length,
1115 mos7840_bulk_in_callback, mos7840_port);
1116
1117 dbg("mos7840_open: bulkin endpoint is %d",
1118 port->bulk_in_endpointAddress);
1119 mos7840_port->read_urb_busy = true;
1120 response = usb_submit_urb(mos7840_port->read_urb, GFP_KERNEL);
1121 if (response) {
1122 dev_err(&port->dev, "%s - Error %d submitting control urb\n",
1123 __func__, response);
1124 mos7840_port->read_urb_busy = false;
1125 }
1126
1127 /* initialize our wait queues */
1128 init_waitqueue_head(&mos7840_port->wait_chase);
1129 init_waitqueue_head(&mos7840_port->delta_msr_wait);
1130
1131 /* initialize our icount structure */
1132 memset(&(mos7840_port->icount), 0x00, sizeof(mos7840_port->icount));
1133
1134 /* initialize our port settings */
1135 /* Must set to enable ints! */
1136 mos7840_port->shadowMCR = MCR_MASTER_IE;
1137 /* send a open port command */
1138 mos7840_port->open = 1;
1139 /* mos7840_change_port_settings(mos7840_port,old_termios); */
1140 mos7840_port->icount.tx = 0;
1141 mos7840_port->icount.rx = 0;
1142
1143 dbg("usb_serial serial:%p mos7840_port:%p\n usb_serial_port port:%p",
1144 serial, mos7840_port, port);
1145
1146 dbg ("%s leave", __func__);
1147
1148 return 0;
1149
1150 }
1151
1152 /*****************************************************************************
1153 * mos7840_chars_in_buffer
1154 * this function is called by the tty driver when it wants to know how many
1155 * bytes of data we currently have outstanding in the port (data that has
1156 * been written, but hasn't made it out the port yet)
1157 * If successful, we return the number of bytes left to be written in the
1158 * system,
1159 * Otherwise we return zero.
1160 *****************************************************************************/
1161
1162 static int mos7840_chars_in_buffer(struct tty_struct *tty)
1163 {
1164 struct usb_serial_port *port = tty->driver_data;
1165 int i;
1166 int chars = 0;
1167 unsigned long flags;
1168 struct moschip_port *mos7840_port;
1169
1170 dbg("%s", " mos7840_chars_in_buffer:entering ...........");
1171
1172 if (mos7840_port_paranoia_check(port, __func__)) {
1173 dbg("%s", "Invalid port");
1174 return 0;
1175 }
1176
1177 mos7840_port = mos7840_get_port_private(port);
1178 if (mos7840_port == NULL) {
1179 dbg("%s", "mos7840_break:leaving ...........");
1180 return 0;
1181 }
1182
1183 spin_lock_irqsave(&mos7840_port->pool_lock, flags);
1184 for (i = 0; i < NUM_URBS; ++i)
1185 if (mos7840_port->busy[i])
1186 chars += URB_TRANSFER_BUFFER_SIZE;
1187 spin_unlock_irqrestore(&mos7840_port->pool_lock, flags);
1188 dbg("%s - returns %d", __func__, chars);
1189 return chars;
1190
1191 }
1192
1193 /*****************************************************************************
1194 * mos7840_close
1195 * this function is called by the tty driver when a port is closed
1196 *****************************************************************************/
1197
1198 static void mos7840_close(struct usb_serial_port *port)
1199 {
1200 struct usb_serial *serial;
1201 struct moschip_port *mos7840_port;
1202 struct moschip_port *port0;
1203 int j;
1204 __u16 Data;
1205
1206 dbg("%s", "mos7840_close:entering...");
1207
1208 if (mos7840_port_paranoia_check(port, __func__)) {
1209 dbg("%s", "Port Paranoia failed");
1210 return;
1211 }
1212
1213 serial = mos7840_get_usb_serial(port, __func__);
1214 if (!serial) {
1215 dbg("%s", "Serial Paranoia failed");
1216 return;
1217 }
1218
1219 mos7840_port = mos7840_get_port_private(port);
1220 port0 = mos7840_get_port_private(serial->port[0]);
1221
1222 if (mos7840_port == NULL || port0 == NULL)
1223 return;
1224
1225 for (j = 0; j < NUM_URBS; ++j)
1226 usb_kill_urb(mos7840_port->write_urb_pool[j]);
1227
1228 /* Freeing Write URBs */
1229 for (j = 0; j < NUM_URBS; ++j) {
1230 if (mos7840_port->write_urb_pool[j]) {
1231 if (mos7840_port->write_urb_pool[j]->transfer_buffer)
1232 kfree(mos7840_port->write_urb_pool[j]->
1233 transfer_buffer);
1234
1235 usb_free_urb(mos7840_port->write_urb_pool[j]);
1236 }
1237 }
1238
1239 /* While closing port, shutdown all bulk read, write *
1240 * and interrupt read if they exists */
1241 if (serial->dev) {
1242 if (mos7840_port->write_urb) {
1243 dbg("%s", "Shutdown bulk write");
1244 usb_kill_urb(mos7840_port->write_urb);
1245 }
1246 if (mos7840_port->read_urb) {
1247 dbg("%s", "Shutdown bulk read");
1248 usb_kill_urb(mos7840_port->read_urb);
1249 mos7840_port->read_urb_busy = false;
1250 }
1251 if ((&mos7840_port->control_urb)) {
1252 dbg("%s", "Shutdown control read");
1253 /*/ usb_kill_urb (mos7840_port->control_urb); */
1254 }
1255 }
1256 /* if(mos7840_port->ctrl_buf != NULL) */
1257 /* kfree(mos7840_port->ctrl_buf); */
1258 port0->open_ports--;
1259 dbg("mos7840_num_open_ports in close%d:in port%d",
1260 port0->open_ports, port->number);
1261 if (port0->open_ports == 0) {
1262 if (serial->port[0]->interrupt_in_urb) {
1263 dbg("%s", "Shutdown interrupt_in_urb");
1264 usb_kill_urb(serial->port[0]->interrupt_in_urb);
1265 }
1266 }
1267
1268 if (mos7840_port->write_urb) {
1269 /* if this urb had a transfer buffer already (old tx) free it */
1270 if (mos7840_port->write_urb->transfer_buffer != NULL)
1271 kfree(mos7840_port->write_urb->transfer_buffer);
1272 usb_free_urb(mos7840_port->write_urb);
1273 }
1274
1275 Data = 0x0;
1276 mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER, Data);
1277
1278 Data = 0x00;
1279 mos7840_set_uart_reg(port, INTERRUPT_ENABLE_REGISTER, Data);
1280
1281 mos7840_port->open = 0;
1282
1283 dbg("%s", "Leaving ............");
1284 }
1285
1286 /************************************************************************
1287 *
1288 * mos7840_block_until_chase_response
1289 *
1290 * This function will block the close until one of the following:
1291 * 1. Response to our Chase comes from mos7840
1292 * 2. A timeout of 10 seconds without activity has expired
1293 * (1K of mos7840 data @ 2400 baud ==> 4 sec to empty)
1294 *
1295 ************************************************************************/
1296
1297 static void mos7840_block_until_chase_response(struct tty_struct *tty,
1298 struct moschip_port *mos7840_port)
1299 {
1300 int timeout = 1 * HZ;
1301 int wait = 10;
1302 int count;
1303
1304 while (1) {
1305 count = mos7840_chars_in_buffer(tty);
1306
1307 /* Check for Buffer status */
1308 if (count <= 0)
1309 return;
1310
1311 /* Block the thread for a while */
1312 interruptible_sleep_on_timeout(&mos7840_port->wait_chase,
1313 timeout);
1314 /* No activity.. count down section */
1315 wait--;
1316 if (wait == 0) {
1317 dbg("%s - TIMEOUT", __func__);
1318 return;
1319 } else {
1320 /* Reset timeout value back to seconds */
1321 wait = 10;
1322 }
1323 }
1324
1325 }
1326
1327 /*****************************************************************************
1328 * mos7840_break
1329 * this function sends a break to the port
1330 *****************************************************************************/
1331 static void mos7840_break(struct tty_struct *tty, int break_state)
1332 {
1333 struct usb_serial_port *port = tty->driver_data;
1334 unsigned char data;
1335 struct usb_serial *serial;
1336 struct moschip_port *mos7840_port;
1337
1338 dbg("%s", "Entering ...........");
1339 dbg("mos7840_break: Start");
1340
1341 if (mos7840_port_paranoia_check(port, __func__)) {
1342 dbg("%s", "Port Paranoia failed");
1343 return;
1344 }
1345
1346 serial = mos7840_get_usb_serial(port, __func__);
1347 if (!serial) {
1348 dbg("%s", "Serial Paranoia failed");
1349 return;
1350 }
1351
1352 mos7840_port = mos7840_get_port_private(port);
1353
1354 if (mos7840_port == NULL)
1355 return;
1356
1357 if (serial->dev)
1358 /* flush and block until tx is empty */
1359 mos7840_block_until_chase_response(tty, mos7840_port);
1360
1361 if (break_state == -1)
1362 data = mos7840_port->shadowLCR | LCR_SET_BREAK;
1363 else
1364 data = mos7840_port->shadowLCR & ~LCR_SET_BREAK;
1365
1366 /* FIXME: no locking on shadowLCR anywhere in driver */
1367 mos7840_port->shadowLCR = data;
1368 dbg("mcs7840_break mos7840_port->shadowLCR is %x",
1369 mos7840_port->shadowLCR);
1370 mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER,
1371 mos7840_port->shadowLCR);
1372
1373 return;
1374 }
1375
1376 /*****************************************************************************
1377 * mos7840_write_room
1378 * this function is called by the tty driver when it wants to know how many
1379 * bytes of data we can accept for a specific port.
1380 * If successful, we return the amount of room that we have for this port
1381 * Otherwise we return a negative error number.
1382 *****************************************************************************/
1383
1384 static int mos7840_write_room(struct tty_struct *tty)
1385 {
1386 struct usb_serial_port *port = tty->driver_data;
1387 int i;
1388 int room = 0;
1389 unsigned long flags;
1390 struct moschip_port *mos7840_port;
1391
1392 dbg("%s", " mos7840_write_room:entering ...........");
1393
1394 if (mos7840_port_paranoia_check(port, __func__)) {
1395 dbg("%s", "Invalid port");
1396 dbg("%s", " mos7840_write_room:leaving ...........");
1397 return -1;
1398 }
1399
1400 mos7840_port = mos7840_get_port_private(port);
1401 if (mos7840_port == NULL) {
1402 dbg("%s", "mos7840_break:leaving ...........");
1403 return -1;
1404 }
1405
1406 spin_lock_irqsave(&mos7840_port->pool_lock, flags);
1407 for (i = 0; i < NUM_URBS; ++i) {
1408 if (!mos7840_port->busy[i])
1409 room += URB_TRANSFER_BUFFER_SIZE;
1410 }
1411 spin_unlock_irqrestore(&mos7840_port->pool_lock, flags);
1412
1413 room = (room == 0) ? 0 : room - URB_TRANSFER_BUFFER_SIZE + 1;
1414 dbg("%s - returns %d", __func__, room);
1415 return room;
1416
1417 }
1418
1419 /*****************************************************************************
1420 * mos7840_write
1421 * this function is called by the tty driver when data should be written to
1422 * the port.
1423 * If successful, we return the number of bytes written, otherwise we
1424 * return a negative error number.
1425 *****************************************************************************/
1426
1427 static int mos7840_write(struct tty_struct *tty, struct usb_serial_port *port,
1428 const unsigned char *data, int count)
1429 {
1430 int status;
1431 int i;
1432 int bytes_sent = 0;
1433 int transfer_size;
1434 unsigned long flags;
1435
1436 struct moschip_port *mos7840_port;
1437 struct usb_serial *serial;
1438 struct urb *urb;
1439 /* __u16 Data; */
1440 const unsigned char *current_position = data;
1441 unsigned char *data1;
1442 dbg("%s", "entering ...........");
1443 /* dbg("mos7840_write: mos7840_port->shadowLCR is %x",
1444 mos7840_port->shadowLCR); */
1445
1446 #ifdef NOTMOS7840
1447 Data = 0x00;
1448 status = mos7840_get_uart_reg(port, LINE_CONTROL_REGISTER, &Data);
1449 mos7840_port->shadowLCR = Data;
1450 dbg("mos7840_write: LINE_CONTROL_REGISTER is %x", Data);
1451 dbg("mos7840_write: mos7840_port->shadowLCR is %x",
1452 mos7840_port->shadowLCR);
1453
1454 /* Data = 0x03; */
1455 /* status = mos7840_set_uart_reg(port,LINE_CONTROL_REGISTER,Data); */
1456 /* mos7840_port->shadowLCR=Data;//Need to add later */
1457
1458 Data |= SERIAL_LCR_DLAB; /* data latch enable in LCR 0x80 */
1459 status = mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data);
1460
1461 /* Data = 0x0c; */
1462 /* status = mos7840_set_uart_reg(port,DIVISOR_LATCH_LSB,Data); */
1463 Data = 0x00;
1464 status = mos7840_get_uart_reg(port, DIVISOR_LATCH_LSB, &Data);
1465 dbg("mos7840_write:DLL value is %x", Data);
1466
1467 Data = 0x0;
1468 status = mos7840_get_uart_reg(port, DIVISOR_LATCH_MSB, &Data);
1469 dbg("mos7840_write:DLM value is %x", Data);
1470
1471 Data = Data & ~SERIAL_LCR_DLAB;
1472 dbg("mos7840_write: mos7840_port->shadowLCR is %x",
1473 mos7840_port->shadowLCR);
1474 status = mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data);
1475 #endif
1476
1477 if (mos7840_port_paranoia_check(port, __func__)) {
1478 dbg("%s", "Port Paranoia failed");
1479 return -1;
1480 }
1481
1482 serial = port->serial;
1483 if (mos7840_serial_paranoia_check(serial, __func__)) {
1484 dbg("%s", "Serial Paranoia failed");
1485 return -1;
1486 }
1487
1488 mos7840_port = mos7840_get_port_private(port);
1489 if (mos7840_port == NULL) {
1490 dbg("%s", "mos7840_port is NULL");
1491 return -1;
1492 }
1493
1494 /* try to find a free urb in the list */
1495 urb = NULL;
1496
1497 spin_lock_irqsave(&mos7840_port->pool_lock, flags);
1498 for (i = 0; i < NUM_URBS; ++i) {
1499 if (!mos7840_port->busy[i]) {
1500 mos7840_port->busy[i] = 1;
1501 urb = mos7840_port->write_urb_pool[i];
1502 dbg("URB:%d", i);
1503 break;
1504 }
1505 }
1506 spin_unlock_irqrestore(&mos7840_port->pool_lock, flags);
1507
1508 if (urb == NULL) {
1509 dbg("%s - no more free urbs", __func__);
1510 goto exit;
1511 }
1512
1513 if (urb->transfer_buffer == NULL) {
1514 urb->transfer_buffer =
1515 kmalloc(URB_TRANSFER_BUFFER_SIZE, GFP_KERNEL);
1516
1517 if (urb->transfer_buffer == NULL) {
1518 dev_err(&port->dev, "%s no more kernel memory...\n",
1519 __func__);
1520 goto exit;
1521 }
1522 }
1523 transfer_size = min(count, URB_TRANSFER_BUFFER_SIZE);
1524
1525 memcpy(urb->transfer_buffer, current_position, transfer_size);
1526
1527 /* fill urb with data and submit */
1528 usb_fill_bulk_urb(urb,
1529 serial->dev,
1530 usb_sndbulkpipe(serial->dev,
1531 port->bulk_out_endpointAddress),
1532 urb->transfer_buffer,
1533 transfer_size,
1534 mos7840_bulk_out_data_callback, mos7840_port);
1535
1536 data1 = urb->transfer_buffer;
1537 dbg("bulkout endpoint is %d", port->bulk_out_endpointAddress);
1538
1539 /* send it down the pipe */
1540 status = usb_submit_urb(urb, GFP_ATOMIC);
1541
1542 if (status) {
1543 mos7840_port->busy[i] = 0;
1544 dev_err(&port->dev, "%s - usb_submit_urb(write bulk) failed "
1545 "with status = %d\n", __func__, status);
1546 bytes_sent = status;
1547 goto exit;
1548 }
1549 bytes_sent = transfer_size;
1550 mos7840_port->icount.tx += transfer_size;
1551 smp_wmb();
1552 dbg("mos7840_port->icount.tx is %d:", mos7840_port->icount.tx);
1553 exit:
1554 return bytes_sent;
1555
1556 }
1557
1558 /*****************************************************************************
1559 * mos7840_throttle
1560 * this function is called by the tty driver when it wants to stop the data
1561 * being read from the port.
1562 *****************************************************************************/
1563
1564 static void mos7840_throttle(struct tty_struct *tty)
1565 {
1566 struct usb_serial_port *port = tty->driver_data;
1567 struct moschip_port *mos7840_port;
1568 int status;
1569
1570 if (mos7840_port_paranoia_check(port, __func__)) {
1571 dbg("%s", "Invalid port");
1572 return;
1573 }
1574
1575 dbg("- port %d", port->number);
1576
1577 mos7840_port = mos7840_get_port_private(port);
1578
1579 if (mos7840_port == NULL)
1580 return;
1581
1582 if (!mos7840_port->open) {
1583 dbg("%s", "port not opened");
1584 return;
1585 }
1586
1587 dbg("%s", "Entering ..........");
1588
1589 /* if we are implementing XON/XOFF, send the stop character */
1590 if (I_IXOFF(tty)) {
1591 unsigned char stop_char = STOP_CHAR(tty);
1592 status = mos7840_write(tty, port, &stop_char, 1);
1593 if (status <= 0)
1594 return;
1595 }
1596 /* if we are implementing RTS/CTS, toggle that line */
1597 if (tty->termios->c_cflag & CRTSCTS) {
1598 mos7840_port->shadowMCR &= ~MCR_RTS;
1599 status = mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER,
1600 mos7840_port->shadowMCR);
1601 if (status < 0)
1602 return;
1603 }
1604
1605 return;
1606 }
1607
1608 /*****************************************************************************
1609 * mos7840_unthrottle
1610 * this function is called by the tty driver when it wants to resume
1611 * the data being read from the port (called after mos7840_throttle is
1612 * called)
1613 *****************************************************************************/
1614 static void mos7840_unthrottle(struct tty_struct *tty)
1615 {
1616 struct usb_serial_port *port = tty->driver_data;
1617 int status;
1618 struct moschip_port *mos7840_port = mos7840_get_port_private(port);
1619
1620 if (mos7840_port_paranoia_check(port, __func__)) {
1621 dbg("%s", "Invalid port");
1622 return;
1623 }
1624
1625 if (mos7840_port == NULL)
1626 return;
1627
1628 if (!mos7840_port->open) {
1629 dbg("%s - port not opened", __func__);
1630 return;
1631 }
1632
1633 dbg("%s", "Entering ..........");
1634
1635 /* if we are implementing XON/XOFF, send the start character */
1636 if (I_IXOFF(tty)) {
1637 unsigned char start_char = START_CHAR(tty);
1638 status = mos7840_write(tty, port, &start_char, 1);
1639 if (status <= 0)
1640 return;
1641 }
1642
1643 /* if we are implementing RTS/CTS, toggle that line */
1644 if (tty->termios->c_cflag & CRTSCTS) {
1645 mos7840_port->shadowMCR |= MCR_RTS;
1646 status = mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER,
1647 mos7840_port->shadowMCR);
1648 if (status < 0)
1649 return;
1650 }
1651 }
1652
1653 static int mos7840_tiocmget(struct tty_struct *tty, struct file *file)
1654 {
1655 struct usb_serial_port *port = tty->driver_data;
1656 struct moschip_port *mos7840_port;
1657 unsigned int result;
1658 __u16 msr;
1659 __u16 mcr;
1660 int status;
1661 mos7840_port = mos7840_get_port_private(port);
1662
1663 dbg("%s - port %d", __func__, port->number);
1664
1665 if (mos7840_port == NULL)
1666 return -ENODEV;
1667
1668 status = mos7840_get_uart_reg(port, MODEM_STATUS_REGISTER, &msr);
1669 status = mos7840_get_uart_reg(port, MODEM_CONTROL_REGISTER, &mcr);
1670 result = ((mcr & MCR_DTR) ? TIOCM_DTR : 0)
1671 | ((mcr & MCR_RTS) ? TIOCM_RTS : 0)
1672 | ((mcr & MCR_LOOPBACK) ? TIOCM_LOOP : 0)
1673 | ((msr & MOS7840_MSR_CTS) ? TIOCM_CTS : 0)
1674 | ((msr & MOS7840_MSR_CD) ? TIOCM_CAR : 0)
1675 | ((msr & MOS7840_MSR_RI) ? TIOCM_RI : 0)
1676 | ((msr & MOS7840_MSR_DSR) ? TIOCM_DSR : 0);
1677
1678 dbg("%s - 0x%04X", __func__, result);
1679
1680 return result;
1681 }
1682
1683 static int mos7840_tiocmset(struct tty_struct *tty, struct file *file,
1684 unsigned int set, unsigned int clear)
1685 {
1686 struct usb_serial_port *port = tty->driver_data;
1687 struct moschip_port *mos7840_port;
1688 unsigned int mcr;
1689 int status;
1690
1691 dbg("%s - port %d", __func__, port->number);
1692
1693 mos7840_port = mos7840_get_port_private(port);
1694
1695 if (mos7840_port == NULL)
1696 return -ENODEV;
1697
1698 /* FIXME: What locks the port registers ? */
1699 mcr = mos7840_port->shadowMCR;
1700 if (clear & TIOCM_RTS)
1701 mcr &= ~MCR_RTS;
1702 if (clear & TIOCM_DTR)
1703 mcr &= ~MCR_DTR;
1704 if (clear & TIOCM_LOOP)
1705 mcr &= ~MCR_LOOPBACK;
1706
1707 if (set & TIOCM_RTS)
1708 mcr |= MCR_RTS;
1709 if (set & TIOCM_DTR)
1710 mcr |= MCR_DTR;
1711 if (set & TIOCM_LOOP)
1712 mcr |= MCR_LOOPBACK;
1713
1714 mos7840_port->shadowMCR = mcr;
1715
1716 status = mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER, mcr);
1717 if (status < 0) {
1718 dbg("setting MODEM_CONTROL_REGISTER Failed");
1719 return status;
1720 }
1721
1722 return 0;
1723 }
1724
1725 /*****************************************************************************
1726 * mos7840_calc_baud_rate_divisor
1727 * this function calculates the proper baud rate divisor for the specified
1728 * baud rate.
1729 *****************************************************************************/
1730 static int mos7840_calc_baud_rate_divisor(int baudRate, int *divisor,
1731 __u16 *clk_sel_val)
1732 {
1733
1734 dbg("%s - %d", __func__, baudRate);
1735
1736 if (baudRate <= 115200) {
1737 *divisor = 115200 / baudRate;
1738 *clk_sel_val = 0x0;
1739 }
1740 if ((baudRate > 115200) && (baudRate <= 230400)) {
1741 *divisor = 230400 / baudRate;
1742 *clk_sel_val = 0x10;
1743 } else if ((baudRate > 230400) && (baudRate <= 403200)) {
1744 *divisor = 403200 / baudRate;
1745 *clk_sel_val = 0x20;
1746 } else if ((baudRate > 403200) && (baudRate <= 460800)) {
1747 *divisor = 460800 / baudRate;
1748 *clk_sel_val = 0x30;
1749 } else if ((baudRate > 460800) && (baudRate <= 806400)) {
1750 *divisor = 806400 / baudRate;
1751 *clk_sel_val = 0x40;
1752 } else if ((baudRate > 806400) && (baudRate <= 921600)) {
1753 *divisor = 921600 / baudRate;
1754 *clk_sel_val = 0x50;
1755 } else if ((baudRate > 921600) && (baudRate <= 1572864)) {
1756 *divisor = 1572864 / baudRate;
1757 *clk_sel_val = 0x60;
1758 } else if ((baudRate > 1572864) && (baudRate <= 3145728)) {
1759 *divisor = 3145728 / baudRate;
1760 *clk_sel_val = 0x70;
1761 }
1762 return 0;
1763
1764 #ifdef NOTMCS7840
1765
1766 for (i = 0; i < ARRAY_SIZE(mos7840_divisor_table); i++) {
1767 if (mos7840_divisor_table[i].BaudRate == baudrate) {
1768 *divisor = mos7840_divisor_table[i].Divisor;
1769 return 0;
1770 }
1771 }
1772
1773 /* After trying for all the standard baud rates *
1774 * Try calculating the divisor for this baud rate */
1775
1776 if (baudrate > 75 && baudrate < 230400) {
1777 /* get the divisor */
1778 custom = (__u16) (230400L / baudrate);
1779
1780 /* Check for round off */
1781 round1 = (__u16) (2304000L / baudrate);
1782 round = (__u16) (round1 - (custom * 10));
1783 if (round > 4)
1784 custom++;
1785 *divisor = custom;
1786
1787 dbg(" Baud %d = %d", baudrate, custom);
1788 return 0;
1789 }
1790
1791 dbg("%s", " Baud calculation Failed...");
1792 return -1;
1793 #endif
1794 }
1795
1796 /*****************************************************************************
1797 * mos7840_send_cmd_write_baud_rate
1798 * this function sends the proper command to change the baud rate of the
1799 * specified port.
1800 *****************************************************************************/
1801
1802 static int mos7840_send_cmd_write_baud_rate(struct moschip_port *mos7840_port,
1803 int baudRate)
1804 {
1805 int divisor = 0;
1806 int status;
1807 __u16 Data;
1808 unsigned char number;
1809 __u16 clk_sel_val;
1810 struct usb_serial_port *port;
1811
1812 if (mos7840_port == NULL)
1813 return -1;
1814
1815 port = (struct usb_serial_port *)mos7840_port->port;
1816 if (mos7840_port_paranoia_check(port, __func__)) {
1817 dbg("%s", "Invalid port");
1818 return -1;
1819 }
1820
1821 if (mos7840_serial_paranoia_check(port->serial, __func__)) {
1822 dbg("%s", "Invalid Serial");
1823 return -1;
1824 }
1825
1826 dbg("%s", "Entering ..........");
1827
1828 number = mos7840_port->port->number - mos7840_port->port->serial->minor;
1829
1830 dbg("%s - port = %d, baud = %d", __func__,
1831 mos7840_port->port->number, baudRate);
1832 /* reset clk_uart_sel in spregOffset */
1833 if (baudRate > 115200) {
1834 #ifdef HW_flow_control
1835 /* NOTE: need to see the pther register to modify */
1836 /* setting h/w flow control bit to 1 */
1837 Data = 0x2b;
1838 mos7840_port->shadowMCR = Data;
1839 status = mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER,
1840 Data);
1841 if (status < 0) {
1842 dbg("Writing spreg failed in set_serial_baud");
1843 return -1;
1844 }
1845 #endif
1846
1847 } else {
1848 #ifdef HW_flow_control
1849 / *setting h/w flow control bit to 0 */
1850 Data = 0xb;
1851 mos7840_port->shadowMCR = Data;
1852 status = mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER,
1853 Data);
1854 if (status < 0) {
1855 dbg("Writing spreg failed in set_serial_baud");
1856 return -1;
1857 }
1858 #endif
1859
1860 }
1861
1862 if (1) { /* baudRate <= 115200) */
1863 clk_sel_val = 0x0;
1864 Data = 0x0;
1865 status = mos7840_calc_baud_rate_divisor(baudRate, &divisor,
1866 &clk_sel_val);
1867 status = mos7840_get_reg_sync(port, mos7840_port->SpRegOffset,
1868 &Data);
1869 if (status < 0) {
1870 dbg("reading spreg failed in set_serial_baud");
1871 return -1;
1872 }
1873 Data = (Data & 0x8f) | clk_sel_val;
1874 status = mos7840_set_reg_sync(port, mos7840_port->SpRegOffset,
1875 Data);
1876 if (status < 0) {
1877 dbg("Writing spreg failed in set_serial_baud");
1878 return -1;
1879 }
1880 /* Calculate the Divisor */
1881
1882 if (status) {
1883 dev_err(&port->dev, "%s - bad baud rate\n", __func__);
1884 return status;
1885 }
1886 /* Enable 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 /* Write the divisor */
1892 Data = (unsigned char)(divisor & 0xff);
1893 dbg("set_serial_baud Value to write DLL is %x", Data);
1894 mos7840_set_uart_reg(port, DIVISOR_LATCH_LSB, Data);
1895
1896 Data = (unsigned char)((divisor & 0xff00) >> 8);
1897 dbg("set_serial_baud Value to write DLM is %x", Data);
1898 mos7840_set_uart_reg(port, DIVISOR_LATCH_MSB, Data);
1899
1900 /* Disable access to divisor latch */
1901 Data = mos7840_port->shadowLCR & ~SERIAL_LCR_DLAB;
1902 mos7840_port->shadowLCR = Data;
1903 mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data);
1904
1905 }
1906 return status;
1907 }
1908
1909 /*****************************************************************************
1910 * mos7840_change_port_settings
1911 * This routine is called to set the UART on the device to match
1912 * the specified new settings.
1913 *****************************************************************************/
1914
1915 static void mos7840_change_port_settings(struct tty_struct *tty,
1916 struct moschip_port *mos7840_port, struct ktermios *old_termios)
1917 {
1918 int baud;
1919 unsigned cflag;
1920 unsigned iflag;
1921 __u8 lData;
1922 __u8 lParity;
1923 __u8 lStop;
1924 int status;
1925 __u16 Data;
1926 struct usb_serial_port *port;
1927 struct usb_serial *serial;
1928
1929 if (mos7840_port == NULL)
1930 return;
1931
1932 port = (struct usb_serial_port *)mos7840_port->port;
1933
1934 if (mos7840_port_paranoia_check(port, __func__)) {
1935 dbg("%s", "Invalid port");
1936 return;
1937 }
1938
1939 if (mos7840_serial_paranoia_check(port->serial, __func__)) {
1940 dbg("%s", "Invalid Serial");
1941 return;
1942 }
1943
1944 serial = port->serial;
1945
1946 dbg("%s - port %d", __func__, mos7840_port->port->number);
1947
1948 if (!mos7840_port->open) {
1949 dbg("%s - port not opened", __func__);
1950 return;
1951 }
1952
1953 dbg("%s", "Entering ..........");
1954
1955 lData = LCR_BITS_8;
1956 lStop = LCR_STOP_1;
1957 lParity = LCR_PAR_NONE;
1958
1959 cflag = tty->termios->c_cflag;
1960 iflag = tty->termios->c_iflag;
1961
1962 /* Change the number of bits */
1963 if (cflag & CSIZE) {
1964 switch (cflag & CSIZE) {
1965 case CS5:
1966 lData = LCR_BITS_5;
1967 break;
1968
1969 case CS6:
1970 lData = LCR_BITS_6;
1971 break;
1972
1973 case CS7:
1974 lData = LCR_BITS_7;
1975 break;
1976 default:
1977 case CS8:
1978 lData = LCR_BITS_8;
1979 break;
1980 }
1981 }
1982 /* Change the Parity bit */
1983 if (cflag & PARENB) {
1984 if (cflag & PARODD) {
1985 lParity = LCR_PAR_ODD;
1986 dbg("%s - parity = odd", __func__);
1987 } else {
1988 lParity = LCR_PAR_EVEN;
1989 dbg("%s - parity = even", __func__);
1990 }
1991
1992 } else {
1993 dbg("%s - parity = none", __func__);
1994 }
1995
1996 if (cflag & CMSPAR)
1997 lParity = lParity | 0x20;
1998
1999 /* Change the Stop bit */
2000 if (cflag & CSTOPB) {
2001 lStop = LCR_STOP_2;
2002 dbg("%s - stop bits = 2", __func__);
2003 } else {
2004 lStop = LCR_STOP_1;
2005 dbg("%s - stop bits = 1", __func__);
2006 }
2007
2008 /* Update the LCR with the correct value */
2009 mos7840_port->shadowLCR &=
2010 ~(LCR_BITS_MASK | LCR_STOP_MASK | LCR_PAR_MASK);
2011 mos7840_port->shadowLCR |= (lData | lParity | lStop);
2012
2013 dbg("mos7840_change_port_settings mos7840_port->shadowLCR is %x",
2014 mos7840_port->shadowLCR);
2015 /* Disable Interrupts */
2016 Data = 0x00;
2017 mos7840_set_uart_reg(port, INTERRUPT_ENABLE_REGISTER, Data);
2018
2019 Data = 0x00;
2020 mos7840_set_uart_reg(port, FIFO_CONTROL_REGISTER, Data);
2021
2022 Data = 0xcf;
2023 mos7840_set_uart_reg(port, FIFO_CONTROL_REGISTER, Data);
2024
2025 /* Send the updated LCR value to the mos7840 */
2026 Data = mos7840_port->shadowLCR;
2027
2028 mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data);
2029
2030 Data = 0x00b;
2031 mos7840_port->shadowMCR = Data;
2032 mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER, Data);
2033 Data = 0x00b;
2034 mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER, Data);
2035
2036 /* set up the MCR register and send it to the mos7840 */
2037
2038 mos7840_port->shadowMCR = MCR_MASTER_IE;
2039 if (cflag & CBAUD)
2040 mos7840_port->shadowMCR |= (MCR_DTR | MCR_RTS);
2041
2042 if (cflag & CRTSCTS)
2043 mos7840_port->shadowMCR |= (MCR_XON_ANY);
2044 else
2045 mos7840_port->shadowMCR &= ~(MCR_XON_ANY);
2046
2047 Data = mos7840_port->shadowMCR;
2048 mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER, Data);
2049
2050 /* Determine divisor based on baud rate */
2051 baud = tty_get_baud_rate(tty);
2052
2053 if (!baud) {
2054 /* pick a default, any default... */
2055 dbg("%s", "Picked default baud...");
2056 baud = 9600;
2057 }
2058
2059 dbg("%s - baud rate = %d", __func__, baud);
2060 status = mos7840_send_cmd_write_baud_rate(mos7840_port, baud);
2061
2062 /* Enable Interrupts */
2063 Data = 0x0c;
2064 mos7840_set_uart_reg(port, INTERRUPT_ENABLE_REGISTER, Data);
2065
2066 if (mos7840_port->read_urb_busy == false) {
2067 mos7840_port->read_urb->dev = serial->dev;
2068 mos7840_port->read_urb_busy = true;
2069 status = usb_submit_urb(mos7840_port->read_urb, GFP_ATOMIC);
2070 if (status) {
2071 dbg("usb_submit_urb(read bulk) failed, status = %d",
2072 status);
2073 mos7840_port->read_urb_busy = false;
2074 }
2075 }
2076 wake_up(&mos7840_port->delta_msr_wait);
2077 mos7840_port->delta_msr_cond = 1;
2078 dbg("mos7840_change_port_settings mos7840_port->shadowLCR is End %x",
2079 mos7840_port->shadowLCR);
2080
2081 return;
2082 }
2083
2084 /*****************************************************************************
2085 * mos7840_set_termios
2086 * this function is called by the tty driver when it wants to change
2087 * the termios structure
2088 *****************************************************************************/
2089
2090 static void mos7840_set_termios(struct tty_struct *tty,
2091 struct usb_serial_port *port,
2092 struct ktermios *old_termios)
2093 {
2094 int status;
2095 unsigned int cflag;
2096 struct usb_serial *serial;
2097 struct moschip_port *mos7840_port;
2098 dbg("mos7840_set_termios: START");
2099 if (mos7840_port_paranoia_check(port, __func__)) {
2100 dbg("%s", "Invalid port");
2101 return;
2102 }
2103
2104 serial = port->serial;
2105
2106 if (mos7840_serial_paranoia_check(serial, __func__)) {
2107 dbg("%s", "Invalid Serial");
2108 return;
2109 }
2110
2111 mos7840_port = mos7840_get_port_private(port);
2112
2113 if (mos7840_port == NULL)
2114 return;
2115
2116 if (!mos7840_port->open) {
2117 dbg("%s - port not opened", __func__);
2118 return;
2119 }
2120
2121 dbg("%s", "setting termios - ");
2122
2123 cflag = tty->termios->c_cflag;
2124
2125 dbg("%s - clfag %08x iflag %08x", __func__,
2126 tty->termios->c_cflag, RELEVANT_IFLAG(tty->termios->c_iflag));
2127 dbg("%s - old clfag %08x old iflag %08x", __func__,
2128 old_termios->c_cflag, RELEVANT_IFLAG(old_termios->c_iflag));
2129 dbg("%s - port %d", __func__, port->number);
2130
2131 /* change the port settings to the new ones specified */
2132
2133 mos7840_change_port_settings(tty, mos7840_port, old_termios);
2134
2135 if (!mos7840_port->read_urb) {
2136 dbg("%s", "URB KILLED !!!!!");
2137 return;
2138 }
2139
2140 if (mos7840_port->read_urb_busy == false) {
2141 mos7840_port->read_urb->dev = serial->dev;
2142 mos7840_port->read_urb_busy = true;
2143 status = usb_submit_urb(mos7840_port->read_urb, GFP_ATOMIC);
2144 if (status) {
2145 dbg("usb_submit_urb(read bulk) failed, status = %d",
2146 status);
2147 mos7840_port->read_urb_busy = false;
2148 }
2149 }
2150 return;
2151 }
2152
2153 /*****************************************************************************
2154 * mos7840_get_lsr_info - get line status register info
2155 *
2156 * Purpose: Let user call ioctl() to get info when the UART physically
2157 * is emptied. On bus types like RS485, the transmitter must
2158 * release the bus after transmitting. This must be done when
2159 * the transmit shift register is empty, not be done when the
2160 * transmit holding register is empty. This functionality
2161 * allows an RS485 driver to be written in user space.
2162 *****************************************************************************/
2163
2164 static int mos7840_get_lsr_info(struct tty_struct *tty,
2165 unsigned int __user *value)
2166 {
2167 int count;
2168 unsigned int result = 0;
2169
2170 count = mos7840_chars_in_buffer(tty);
2171 if (count == 0) {
2172 dbg("%s -- Empty", __func__);
2173 result = TIOCSER_TEMT;
2174 }
2175
2176 if (copy_to_user(value, &result, sizeof(int)))
2177 return -EFAULT;
2178 return 0;
2179 }
2180
2181 /*****************************************************************************
2182 * mos7840_get_serial_info
2183 * function to get information about serial port
2184 *****************************************************************************/
2185
2186 static int mos7840_get_serial_info(struct moschip_port *mos7840_port,
2187 struct serial_struct __user *retinfo)
2188 {
2189 struct serial_struct tmp;
2190
2191 if (mos7840_port == NULL)
2192 return -1;
2193
2194 if (!retinfo)
2195 return -EFAULT;
2196
2197 memset(&tmp, 0, sizeof(tmp));
2198
2199 tmp.type = PORT_16550A;
2200 tmp.line = mos7840_port->port->serial->minor;
2201 tmp.port = mos7840_port->port->number;
2202 tmp.irq = 0;
2203 tmp.flags = ASYNC_SKIP_TEST | ASYNC_AUTO_IRQ;
2204 tmp.xmit_fifo_size = NUM_URBS * URB_TRANSFER_BUFFER_SIZE;
2205 tmp.baud_base = 9600;
2206 tmp.close_delay = 5 * HZ;
2207 tmp.closing_wait = 30 * HZ;
2208
2209 if (copy_to_user(retinfo, &tmp, sizeof(*retinfo)))
2210 return -EFAULT;
2211 return 0;
2212 }
2213
2214 /*****************************************************************************
2215 * SerialIoctl
2216 * this function handles any ioctl calls to the driver
2217 *****************************************************************************/
2218
2219 static int mos7840_ioctl(struct tty_struct *tty, struct file *file,
2220 unsigned int cmd, unsigned long arg)
2221 {
2222 struct usb_serial_port *port = tty->driver_data;
2223 void __user *argp = (void __user *)arg;
2224 struct moschip_port *mos7840_port;
2225
2226 struct async_icount cnow;
2227 struct async_icount cprev;
2228 struct serial_icounter_struct icount;
2229
2230 if (mos7840_port_paranoia_check(port, __func__)) {
2231 dbg("%s", "Invalid port");
2232 return -1;
2233 }
2234
2235 mos7840_port = mos7840_get_port_private(port);
2236
2237 if (mos7840_port == NULL)
2238 return -1;
2239
2240 dbg("%s - port %d, cmd = 0x%x", __func__, port->number, cmd);
2241
2242 switch (cmd) {
2243 /* return number of bytes available */
2244
2245 case TIOCSERGETLSR:
2246 dbg("%s (%d) TIOCSERGETLSR", __func__, port->number);
2247 return mos7840_get_lsr_info(tty, argp);
2248 return 0;
2249
2250 case TIOCGSERIAL:
2251 dbg("%s (%d) TIOCGSERIAL", __func__, port->number);
2252 return mos7840_get_serial_info(mos7840_port, argp);
2253
2254 case TIOCSSERIAL:
2255 dbg("%s (%d) TIOCSSERIAL", __func__, port->number);
2256 break;
2257
2258 case TIOCMIWAIT:
2259 dbg("%s (%d) TIOCMIWAIT", __func__, port->number);
2260 cprev = mos7840_port->icount;
2261 while (1) {
2262 /* interruptible_sleep_on(&mos7840_port->delta_msr_wait); */
2263 mos7840_port->delta_msr_cond = 0;
2264 wait_event_interruptible(mos7840_port->delta_msr_wait,
2265 (mos7840_port->
2266 delta_msr_cond == 1));
2267
2268 /* see if a signal did it */
2269 if (signal_pending(current))
2270 return -ERESTARTSYS;
2271 cnow = mos7840_port->icount;
2272 smp_rmb();
2273 if (cnow.rng == cprev.rng && cnow.dsr == cprev.dsr &&
2274 cnow.dcd == cprev.dcd && cnow.cts == cprev.cts)
2275 return -EIO; /* no change => error */
2276 if (((arg & TIOCM_RNG) && (cnow.rng != cprev.rng)) ||
2277 ((arg & TIOCM_DSR) && (cnow.dsr != cprev.dsr)) ||
2278 ((arg & TIOCM_CD) && (cnow.dcd != cprev.dcd)) ||
2279 ((arg & TIOCM_CTS) && (cnow.cts != cprev.cts))) {
2280 return 0;
2281 }
2282 cprev = cnow;
2283 }
2284 /* NOTREACHED */
2285 break;
2286
2287 case TIOCGICOUNT:
2288 cnow = mos7840_port->icount;
2289 smp_rmb();
2290
2291 memset(&icount, 0, sizeof(struct serial_icounter_struct));
2292
2293 icount.cts = cnow.cts;
2294 icount.dsr = cnow.dsr;
2295 icount.rng = cnow.rng;
2296 icount.dcd = cnow.dcd;
2297 icount.rx = cnow.rx;
2298 icount.tx = cnow.tx;
2299 icount.frame = cnow.frame;
2300 icount.overrun = cnow.overrun;
2301 icount.parity = cnow.parity;
2302 icount.brk = cnow.brk;
2303 icount.buf_overrun = cnow.buf_overrun;
2304
2305 dbg("%s (%d) TIOCGICOUNT RX=%d, TX=%d", __func__,
2306 port->number, icount.rx, icount.tx);
2307 if (copy_to_user(argp, &icount, sizeof(icount)))
2308 return -EFAULT;
2309 return 0;
2310 default:
2311 break;
2312 }
2313 return -ENOIOCTLCMD;
2314 }
2315
2316 static int mos7840_calc_num_ports(struct usb_serial *serial)
2317 {
2318 int mos7840_num_ports = 0;
2319
2320 dbg("numberofendpoints: cur %d, alt %d",
2321 (int)serial->interface->cur_altsetting->desc.bNumEndpoints,
2322 (int)serial->interface->altsetting->desc.bNumEndpoints);
2323 if (serial->interface->cur_altsetting->desc.bNumEndpoints == 5) {
2324 mos7840_num_ports = serial->num_ports = 2;
2325 } else if (serial->interface->cur_altsetting->desc.bNumEndpoints == 9) {
2326 serial->num_bulk_in = 4;
2327 serial->num_bulk_out = 4;
2328 mos7840_num_ports = serial->num_ports = 4;
2329 }
2330 dbg ("mos7840_num_ports = %d", mos7840_num_ports);
2331 return mos7840_num_ports;
2332 }
2333
2334 /****************************************************************************
2335 * mos7840_startup
2336 ****************************************************************************/
2337
2338 static int mos7840_startup(struct usb_serial *serial)
2339 {
2340 struct moschip_port *mos7840_port;
2341 struct usb_device *dev;
2342 int i, status;
2343
2344 __u16 Data;
2345 dbg("%s", "mos7840_startup :Entering..........");
2346
2347 if (!serial) {
2348 dbg("%s", "Invalid Handler");
2349 return -1;
2350 }
2351
2352 dev = serial->dev;
2353
2354 dbg("%s", "Entering...");
2355 dbg ("mos7840_startup: serial = %p", serial);
2356
2357 /* we set up the pointers to the endpoints in the mos7840_open *
2358 * function, as the structures aren't created yet. */
2359
2360 /* set up port private structures */
2361 for (i = 0; i < serial->num_ports; ++i) {
2362 dbg ("mos7840_startup: configuring port %d............", i);
2363 mos7840_port = kzalloc(sizeof(struct moschip_port), GFP_KERNEL);
2364 if (mos7840_port == NULL) {
2365 dev_err(&dev->dev, "%s - Out of memory\n", __func__);
2366 status = -ENOMEM;
2367 i--; /* don't follow NULL pointer cleaning up */
2368 goto error;
2369 }
2370
2371 /* Initialize all port interrupt end point to port 0 int
2372 * endpoint. Our device has only one interrupt end point
2373 * common to all port */
2374
2375 mos7840_port->port = serial->port[i];
2376 mos7840_set_port_private(serial->port[i], mos7840_port);
2377 spin_lock_init(&mos7840_port->pool_lock);
2378
2379 /* minor is not initialised until later by
2380 * usb-serial.c:get_free_serial() and cannot therefore be used
2381 * to index device instances */
2382 mos7840_port->port_num = i + 1;
2383 dbg ("serial->port[i]->number = %d", serial->port[i]->number);
2384 dbg ("serial->port[i]->serial->minor = %d", serial->port[i]->serial->minor);
2385 dbg ("mos7840_port->port_num = %d", mos7840_port->port_num);
2386 dbg ("serial->minor = %d", serial->minor);
2387
2388 if (mos7840_port->port_num == 1) {
2389 mos7840_port->SpRegOffset = 0x0;
2390 mos7840_port->ControlRegOffset = 0x1;
2391 mos7840_port->DcrRegOffset = 0x4;
2392 } else if ((mos7840_port->port_num == 2)
2393 && (serial->num_ports == 4)) {
2394 mos7840_port->SpRegOffset = 0x8;
2395 mos7840_port->ControlRegOffset = 0x9;
2396 mos7840_port->DcrRegOffset = 0x16;
2397 } else if ((mos7840_port->port_num == 2)
2398 && (serial->num_ports == 2)) {
2399 mos7840_port->SpRegOffset = 0xa;
2400 mos7840_port->ControlRegOffset = 0xb;
2401 mos7840_port->DcrRegOffset = 0x19;
2402 } else if ((mos7840_port->port_num == 3)
2403 && (serial->num_ports == 4)) {
2404 mos7840_port->SpRegOffset = 0xa;
2405 mos7840_port->ControlRegOffset = 0xb;
2406 mos7840_port->DcrRegOffset = 0x19;
2407 } else if ((mos7840_port->port_num == 4)
2408 && (serial->num_ports == 4)) {
2409 mos7840_port->SpRegOffset = 0xc;
2410 mos7840_port->ControlRegOffset = 0xd;
2411 mos7840_port->DcrRegOffset = 0x1c;
2412 }
2413 mos7840_dump_serial_port(mos7840_port);
2414 mos7840_set_port_private(serial->port[i], mos7840_port);
2415
2416 /* enable rx_disable bit in control register */
2417 status = mos7840_get_reg_sync(serial->port[i],
2418 mos7840_port->ControlRegOffset, &Data);
2419 if (status < 0) {
2420 dbg("Reading ControlReg failed status-0x%x", status);
2421 break;
2422 } else
2423 dbg("ControlReg Reading success val is %x, status%d",
2424 Data, status);
2425 Data |= 0x08; /* setting driver done bit */
2426 Data |= 0x04; /* sp1_bit to have cts change reflect in
2427 modem status reg */
2428
2429 /* Data |= 0x20; //rx_disable bit */
2430 status = mos7840_set_reg_sync(serial->port[i],
2431 mos7840_port->ControlRegOffset, Data);
2432 if (status < 0) {
2433 dbg("Writing ControlReg failed(rx_disable) status-0x%x", status);
2434 break;
2435 } else
2436 dbg("ControlReg Writing success(rx_disable) status%d",
2437 status);
2438
2439 /* Write default values in DCR (i.e 0x01 in DCR0, 0x05 in DCR2
2440 and 0x24 in DCR3 */
2441 Data = 0x01;
2442 status = mos7840_set_reg_sync(serial->port[i],
2443 (__u16) (mos7840_port->DcrRegOffset + 0), Data);
2444 if (status < 0) {
2445 dbg("Writing DCR0 failed status-0x%x", status);
2446 break;
2447 } else
2448 dbg("DCR0 Writing success status%d", status);
2449
2450 Data = 0x05;
2451 status = mos7840_set_reg_sync(serial->port[i],
2452 (__u16) (mos7840_port->DcrRegOffset + 1), Data);
2453 if (status < 0) {
2454 dbg("Writing DCR1 failed status-0x%x", status);
2455 break;
2456 } else
2457 dbg("DCR1 Writing success status%d", status);
2458
2459 Data = 0x24;
2460 status = mos7840_set_reg_sync(serial->port[i],
2461 (__u16) (mos7840_port->DcrRegOffset + 2), Data);
2462 if (status < 0) {
2463 dbg("Writing DCR2 failed status-0x%x", status);
2464 break;
2465 } else
2466 dbg("DCR2 Writing success status%d", status);
2467
2468 /* write values in clkstart0x0 and clkmulti 0x20 */
2469 Data = 0x0;
2470 status = mos7840_set_reg_sync(serial->port[i],
2471 CLK_START_VALUE_REGISTER, Data);
2472 if (status < 0) {
2473 dbg("Writing CLK_START_VALUE_REGISTER failed status-0x%x", status);
2474 break;
2475 } else
2476 dbg("CLK_START_VALUE_REGISTER Writing success status%d", status);
2477
2478 Data = 0x20;
2479 status = mos7840_set_reg_sync(serial->port[i],
2480 CLK_MULTI_REGISTER, Data);
2481 if (status < 0) {
2482 dbg("Writing CLK_MULTI_REGISTER failed status-0x%x",
2483 status);
2484 goto error;
2485 } else
2486 dbg("CLK_MULTI_REGISTER Writing success status%d",
2487 status);
2488
2489 /* write value 0x0 to scratchpad register */
2490 Data = 0x00;
2491 status = mos7840_set_uart_reg(serial->port[i],
2492 SCRATCH_PAD_REGISTER, Data);
2493 if (status < 0) {
2494 dbg("Writing SCRATCH_PAD_REGISTER failed status-0x%x",
2495 status);
2496 break;
2497 } else
2498 dbg("SCRATCH_PAD_REGISTER Writing success status%d",
2499 status);
2500
2501 /* Zero Length flag register */
2502 if ((mos7840_port->port_num != 1)
2503 && (serial->num_ports == 2)) {
2504
2505 Data = 0xff;
2506 status = mos7840_set_reg_sync(serial->port[i],
2507 (__u16) (ZLP_REG1 +
2508 ((__u16)mos7840_port->port_num)), Data);
2509 dbg("ZLIP offset %x",
2510 (__u16) (ZLP_REG1 +
2511 ((__u16) mos7840_port->port_num)));
2512 if (status < 0) {
2513 dbg("Writing ZLP_REG%d failed status-0x%x",
2514 i + 2, status);
2515 break;
2516 } else
2517 dbg("ZLP_REG%d Writing success status%d",
2518 i + 2, status);
2519 } else {
2520 Data = 0xff;
2521 status = mos7840_set_reg_sync(serial->port[i],
2522 (__u16) (ZLP_REG1 +
2523 ((__u16)mos7840_port->port_num) - 0x1), Data);
2524 dbg("ZLIP offset %x",
2525 (__u16) (ZLP_REG1 +
2526 ((__u16) mos7840_port->port_num) - 0x1));
2527 if (status < 0) {
2528 dbg("Writing ZLP_REG%d failed status-0x%x",
2529 i + 1, status);
2530 break;
2531 } else
2532 dbg("ZLP_REG%d Writing success status%d",
2533 i + 1, status);
2534
2535 }
2536 mos7840_port->control_urb = usb_alloc_urb(0, GFP_KERNEL);
2537 mos7840_port->ctrl_buf = kmalloc(16, GFP_KERNEL);
2538 mos7840_port->dr = kmalloc(sizeof(struct usb_ctrlrequest),
2539 GFP_KERNEL);
2540 if (!mos7840_port->control_urb || !mos7840_port->ctrl_buf ||
2541 !mos7840_port->dr) {
2542 status = -ENOMEM;
2543 goto error;
2544 }
2545 }
2546 dbg ("mos7840_startup: all ports configured...........");
2547
2548 /* Zero Length flag enable */
2549 Data = 0x0f;
2550 status = mos7840_set_reg_sync(serial->port[0], ZLP_REG5, Data);
2551 if (status < 0) {
2552 dbg("Writing ZLP_REG5 failed status-0x%x", status);
2553 goto error;
2554 } else
2555 dbg("ZLP_REG5 Writing success status%d", status);
2556
2557 /* setting configuration feature to one */
2558 usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0),
2559 (__u8) 0x03, 0x00, 0x01, 0x00, NULL, 0x00, 5 * HZ);
2560 return 0;
2561 error:
2562 for (/* nothing */; i >= 0; i--) {
2563 mos7840_port = mos7840_get_port_private(serial->port[i]);
2564
2565 kfree(mos7840_port->dr);
2566 kfree(mos7840_port->ctrl_buf);
2567 usb_free_urb(mos7840_port->control_urb);
2568 kfree(mos7840_port);
2569 serial->port[i] = NULL;
2570 }
2571 return status;
2572 }
2573
2574 /****************************************************************************
2575 * mos7840_disconnect
2576 * This function is called whenever the device is removed from the usb bus.
2577 ****************************************************************************/
2578
2579 static void mos7840_disconnect(struct usb_serial *serial)
2580 {
2581 int i;
2582 unsigned long flags;
2583 struct moschip_port *mos7840_port;
2584 dbg("%s", " disconnect :entering..........");
2585
2586 if (!serial) {
2587 dbg("%s", "Invalid Handler");
2588 return;
2589 }
2590
2591 /* check for the ports to be closed,close the ports and disconnect */
2592
2593 /* free private structure allocated for serial port *
2594 * stop reads and writes on all ports */
2595
2596 for (i = 0; i < serial->num_ports; ++i) {
2597 mos7840_port = mos7840_get_port_private(serial->port[i]);
2598 dbg ("mos7840_port %d = %p", i, mos7840_port);
2599 if (mos7840_port) {
2600 spin_lock_irqsave(&mos7840_port->pool_lock, flags);
2601 mos7840_port->zombie = 1;
2602 spin_unlock_irqrestore(&mos7840_port->pool_lock, flags);
2603 usb_kill_urb(mos7840_port->control_urb);
2604 }
2605 }
2606
2607 dbg("%s", "Thank u :: ");
2608
2609 }
2610
2611 /****************************************************************************
2612 * mos7840_release
2613 * This function is called when the usb_serial structure is freed.
2614 ****************************************************************************/
2615
2616 static void mos7840_release(struct usb_serial *serial)
2617 {
2618 int i;
2619 struct moschip_port *mos7840_port;
2620 dbg("%s", " release :entering..........");
2621
2622 if (!serial) {
2623 dbg("%s", "Invalid Handler");
2624 return;
2625 }
2626
2627 /* check for the ports to be closed,close the ports and disconnect */
2628
2629 /* free private structure allocated for serial port *
2630 * stop reads and writes on all ports */
2631
2632 for (i = 0; i < serial->num_ports; ++i) {
2633 mos7840_port = mos7840_get_port_private(serial->port[i]);
2634 dbg("mos7840_port %d = %p", i, mos7840_port);
2635 if (mos7840_port) {
2636 kfree(mos7840_port->ctrl_buf);
2637 kfree(mos7840_port->dr);
2638 kfree(mos7840_port);
2639 }
2640 }
2641
2642 dbg("%s", "Thank u :: ");
2643
2644 }
2645
2646 static struct usb_driver io_driver = {
2647 .name = "mos7840",
2648 .probe = usb_serial_probe,
2649 .disconnect = usb_serial_disconnect,
2650 .id_table = moschip_id_table_combined,
2651 .no_dynamic_id = 1,
2652 };
2653
2654 static struct usb_serial_driver moschip7840_4port_device = {
2655 .driver = {
2656 .owner = THIS_MODULE,
2657 .name = "mos7840",
2658 },
2659 .description = DRIVER_DESC,
2660 .usb_driver = &io_driver,
2661 .id_table = moschip_port_id_table,
2662 .num_ports = 4,
2663 .open = mos7840_open,
2664 .close = mos7840_close,
2665 .write = mos7840_write,
2666 .write_room = mos7840_write_room,
2667 .chars_in_buffer = mos7840_chars_in_buffer,
2668 .throttle = mos7840_throttle,
2669 .unthrottle = mos7840_unthrottle,
2670 .calc_num_ports = mos7840_calc_num_ports,
2671 #ifdef MCSSerialProbe
2672 .probe = mos7840_serial_probe,
2673 #endif
2674 .ioctl = mos7840_ioctl,
2675 .set_termios = mos7840_set_termios,
2676 .break_ctl = mos7840_break,
2677 .tiocmget = mos7840_tiocmget,
2678 .tiocmset = mos7840_tiocmset,
2679 .attach = mos7840_startup,
2680 .disconnect = mos7840_disconnect,
2681 .release = mos7840_release,
2682 .read_bulk_callback = mos7840_bulk_in_callback,
2683 .read_int_callback = mos7840_interrupt_callback,
2684 };
2685
2686 /****************************************************************************
2687 * moschip7840_init
2688 * This is called by the module subsystem, or on startup to initialize us
2689 ****************************************************************************/
2690 static int __init moschip7840_init(void)
2691 {
2692 int retval;
2693
2694 dbg("%s", " mos7840_init :entering..........");
2695
2696 /* Register with the usb serial */
2697 retval = usb_serial_register(&moschip7840_4port_device);
2698
2699 if (retval)
2700 goto failed_port_device_register;
2701
2702 dbg("%s", "Entering...");
2703 printk(KERN_INFO KBUILD_MODNAME ": " DRIVER_VERSION ":"
2704 DRIVER_DESC "\n");
2705
2706 /* Register with the usb */
2707 retval = usb_register(&io_driver);
2708 if (retval == 0) {
2709 dbg("%s", "Leaving...");
2710 return 0;
2711 }
2712 usb_serial_deregister(&moschip7840_4port_device);
2713 failed_port_device_register:
2714 return retval;
2715 }
2716
2717 /****************************************************************************
2718 * moschip7840_exit
2719 * Called when the driver is about to be unloaded.
2720 ****************************************************************************/
2721 static void __exit moschip7840_exit(void)
2722 {
2723
2724 dbg("%s", " mos7840_exit :entering..........");
2725
2726 usb_deregister(&io_driver);
2727
2728 usb_serial_deregister(&moschip7840_4port_device);
2729
2730 dbg("%s", "Entering...");
2731 }
2732
2733 module_init(moschip7840_init);
2734 module_exit(moschip7840_exit);
2735
2736 /* Module information */
2737 MODULE_DESCRIPTION(DRIVER_DESC);
2738 MODULE_LICENSE("GPL");
2739
2740 module_param(debug, bool, S_IRUGO | S_IWUSR);
2741 MODULE_PARM_DESC(debug, "Debug enabled or not");
Linux 2.6 ibm-acpi/thinkpad-acpi driver git tree