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Merge branch 'for-linus' of git://selinuxproject.org/~jmorris/linux-security
[deliverable/linux.git] / drivers / usb / serial / mos7840.c
1 /*
2 * This program is free software; you can redistribute it and/or modify
3 * it under the terms of the GNU General Public License as published by
4 * the Free Software Foundation; either version 2 of the License, or
5 * (at your option) any later version.
6 *
7 * This program is distributed in the hope that it will be useful,
8 * but WITHOUT ANY WARRANTY; without even the implied warranty of
9 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
10 * GNU General Public License for more details.
11 *
12 * You should have received a copy of the GNU General Public License
13 * along with this program; if not, write to the Free Software
14 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
15 *
16 * Clean ups from Moschip version and a few ioctl implementations by:
17 * Paul B Schroeder <pschroeder "at" uplogix "dot" com>
18 *
19 * Originally based on drivers/usb/serial/io_edgeport.c which is:
20 * Copyright (C) 2000 Inside Out Networks, All rights reserved.
21 * Copyright (C) 2001-2002 Greg Kroah-Hartman <greg@kroah.com>
22 *
23 */
24
25 #include <linux/kernel.h>
26 #include <linux/errno.h>
27 #include <linux/init.h>
28 #include <linux/slab.h>
29 #include <linux/tty.h>
30 #include <linux/tty_driver.h>
31 #include <linux/tty_flip.h>
32 #include <linux/module.h>
33 #include <linux/serial.h>
34 #include <linux/usb.h>
35 #include <linux/usb/serial.h>
36 #include <linux/uaccess.h>
37
38 /*
39 * Version Information
40 */
41 #define DRIVER_VERSION "1.3.2"
42 #define DRIVER_DESC "Moschip 7840/7820 USB Serial Driver"
43
44 /*
45 * 16C50 UART register defines
46 */
47
48 #define LCR_BITS_5 0x00 /* 5 bits/char */
49 #define LCR_BITS_6 0x01 /* 6 bits/char */
50 #define LCR_BITS_7 0x02 /* 7 bits/char */
51 #define LCR_BITS_8 0x03 /* 8 bits/char */
52 #define LCR_BITS_MASK 0x03 /* Mask for bits/char field */
53
54 #define LCR_STOP_1 0x00 /* 1 stop bit */
55 #define LCR_STOP_1_5 0x04 /* 1.5 stop bits (if 5 bits/char) */
56 #define LCR_STOP_2 0x04 /* 2 stop bits (if 6-8 bits/char) */
57 #define LCR_STOP_MASK 0x04 /* Mask for stop bits field */
58
59 #define LCR_PAR_NONE 0x00 /* No parity */
60 #define LCR_PAR_ODD 0x08 /* Odd parity */
61 #define LCR_PAR_EVEN 0x18 /* Even parity */
62 #define LCR_PAR_MARK 0x28 /* Force parity bit to 1 */
63 #define LCR_PAR_SPACE 0x38 /* Force parity bit to 0 */
64 #define LCR_PAR_MASK 0x38 /* Mask for parity field */
65
66 #define LCR_SET_BREAK 0x40 /* Set Break condition */
67 #define LCR_DL_ENABLE 0x80 /* Enable access to divisor latch */
68
69 #define MCR_DTR 0x01 /* Assert DTR */
70 #define MCR_RTS 0x02 /* Assert RTS */
71 #define MCR_OUT1 0x04 /* Loopback only: Sets state of RI */
72 #define MCR_MASTER_IE 0x08 /* Enable interrupt outputs */
73 #define MCR_LOOPBACK 0x10 /* Set internal (digital) loopback mode */
74 #define MCR_XON_ANY 0x20 /* Enable any char to exit XOFF mode */
75
76 #define MOS7840_MSR_CTS 0x10 /* Current state of CTS */
77 #define MOS7840_MSR_DSR 0x20 /* Current state of DSR */
78 #define MOS7840_MSR_RI 0x40 /* Current state of RI */
79 #define MOS7840_MSR_CD 0x80 /* Current state of CD */
80
81 /*
82 * Defines used for sending commands to port
83 */
84
85 #define WAIT_FOR_EVER (HZ * 0) /* timeout urb is wait for ever */
86 #define MOS_WDR_TIMEOUT (HZ * 5) /* default urb timeout */
87
88 #define MOS_PORT1 0x0200
89 #define MOS_PORT2 0x0300
90 #define MOS_VENREG 0x0000
91 #define MOS_MAX_PORT 0x02
92 #define MOS_WRITE 0x0E
93 #define MOS_READ 0x0D
94
95 /* Requests */
96 #define MCS_RD_RTYPE 0xC0
97 #define MCS_WR_RTYPE 0x40
98 #define MCS_RDREQ 0x0D
99 #define MCS_WRREQ 0x0E
100 #define MCS_CTRL_TIMEOUT 500
101 #define VENDOR_READ_LENGTH (0x01)
102
103 #define MAX_NAME_LEN 64
104
105 #define ZLP_REG1 0x3A /* Zero_Flag_Reg1 58 */
106 #define ZLP_REG5 0x3E /* Zero_Flag_Reg5 62 */
107
108 /* For higher baud Rates use TIOCEXBAUD */
109 #define TIOCEXBAUD 0x5462
110
111 /* vendor id and device id defines */
112
113 /* The native mos7840/7820 component */
114 #define USB_VENDOR_ID_MOSCHIP 0x9710
115 #define MOSCHIP_DEVICE_ID_7840 0x7840
116 #define MOSCHIP_DEVICE_ID_7820 0x7820
117 /* The native component can have its vendor/device id's overridden
118 * in vendor-specific implementations. Such devices can be handled
119 * by making a change here, in moschip_port_id_table, and in
120 * moschip_id_table_combined
121 */
122 #define USB_VENDOR_ID_BANDB 0x0856
123 #define BANDB_DEVICE_ID_USO9ML2_2 0xAC22
124 #define BANDB_DEVICE_ID_USO9ML2_2P 0xBC00
125 #define BANDB_DEVICE_ID_USO9ML2_4 0xAC24
126 #define BANDB_DEVICE_ID_USO9ML2_4P 0xBC01
127 #define BANDB_DEVICE_ID_US9ML2_2 0xAC29
128 #define BANDB_DEVICE_ID_US9ML2_4 0xAC30
129 #define BANDB_DEVICE_ID_USPTL4_2 0xAC31
130 #define BANDB_DEVICE_ID_USPTL4_4 0xAC32
131 #define BANDB_DEVICE_ID_USOPTL4_2 0xAC42
132 #define BANDB_DEVICE_ID_USOPTL4_2P 0xBC02
133 #define BANDB_DEVICE_ID_USOPTL4_4 0xAC44
134 #define BANDB_DEVICE_ID_USOPTL4_4P 0xBC03
135 #define BANDB_DEVICE_ID_USOPTL2_4 0xAC24
136
137 /* This driver also supports
138 * ATEN UC2324 device using Moschip MCS7840
139 * ATEN UC2322 device using Moschip MCS7820
140 */
141 #define USB_VENDOR_ID_ATENINTL 0x0557
142 #define ATENINTL_DEVICE_ID_UC2324 0x2011
143 #define ATENINTL_DEVICE_ID_UC2322 0x7820
144
145 /* Interrupt Routine Defines */
146
147 #define SERIAL_IIR_RLS 0x06
148 #define SERIAL_IIR_MS 0x00
149
150 /*
151 * Emulation of the bit mask on the LINE STATUS REGISTER.
152 */
153 #define SERIAL_LSR_DR 0x0001
154 #define SERIAL_LSR_OE 0x0002
155 #define SERIAL_LSR_PE 0x0004
156 #define SERIAL_LSR_FE 0x0008
157 #define SERIAL_LSR_BI 0x0010
158
159 #define MOS_MSR_DELTA_CTS 0x10
160 #define MOS_MSR_DELTA_DSR 0x20
161 #define MOS_MSR_DELTA_RI 0x40
162 #define MOS_MSR_DELTA_CD 0x80
163
164 /* Serial Port register Address */
165 #define INTERRUPT_ENABLE_REGISTER ((__u16)(0x01))
166 #define FIFO_CONTROL_REGISTER ((__u16)(0x02))
167 #define LINE_CONTROL_REGISTER ((__u16)(0x03))
168 #define MODEM_CONTROL_REGISTER ((__u16)(0x04))
169 #define LINE_STATUS_REGISTER ((__u16)(0x05))
170 #define MODEM_STATUS_REGISTER ((__u16)(0x06))
171 #define SCRATCH_PAD_REGISTER ((__u16)(0x07))
172 #define DIVISOR_LATCH_LSB ((__u16)(0x00))
173 #define DIVISOR_LATCH_MSB ((__u16)(0x01))
174
175 #define CLK_MULTI_REGISTER ((__u16)(0x02))
176 #define CLK_START_VALUE_REGISTER ((__u16)(0x03))
177
178 #define SERIAL_LCR_DLAB ((__u16)(0x0080))
179
180 /*
181 * URB POOL related defines
182 */
183 #define NUM_URBS 16 /* URB Count */
184 #define URB_TRANSFER_BUFFER_SIZE 32 /* URB Size */
185
186
187 static const struct usb_device_id moschip_port_id_table[] = {
188 {USB_DEVICE(USB_VENDOR_ID_MOSCHIP, MOSCHIP_DEVICE_ID_7840)},
189 {USB_DEVICE(USB_VENDOR_ID_MOSCHIP, MOSCHIP_DEVICE_ID_7820)},
190 {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USO9ML2_2)},
191 {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USO9ML2_2P)},
192 {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USO9ML2_4)},
193 {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USO9ML2_4P)},
194 {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_US9ML2_2)},
195 {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_US9ML2_4)},
196 {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USPTL4_2)},
197 {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USPTL4_4)},
198 {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USOPTL4_2)},
199 {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USOPTL4_2P)},
200 {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USOPTL4_4)},
201 {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USOPTL4_4P)},
202 {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USOPTL2_4)},
203 {USB_DEVICE(USB_VENDOR_ID_ATENINTL, ATENINTL_DEVICE_ID_UC2324)},
204 {USB_DEVICE(USB_VENDOR_ID_ATENINTL, ATENINTL_DEVICE_ID_UC2322)},
205 {} /* terminating entry */
206 };
207
208 static const struct usb_device_id moschip_id_table_combined[] __devinitconst = {
209 {USB_DEVICE(USB_VENDOR_ID_MOSCHIP, MOSCHIP_DEVICE_ID_7840)},
210 {USB_DEVICE(USB_VENDOR_ID_MOSCHIP, MOSCHIP_DEVICE_ID_7820)},
211 {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USO9ML2_2)},
212 {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USO9ML2_2P)},
213 {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USO9ML2_4)},
214 {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USO9ML2_4P)},
215 {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_US9ML2_2)},
216 {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_US9ML2_4)},
217 {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USPTL4_2)},
218 {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USPTL4_4)},
219 {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USOPTL4_2)},
220 {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USOPTL4_2P)},
221 {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USOPTL4_4)},
222 {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USOPTL4_4P)},
223 {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USOPTL2_4)},
224 {USB_DEVICE(USB_VENDOR_ID_ATENINTL, ATENINTL_DEVICE_ID_UC2324)},
225 {USB_DEVICE(USB_VENDOR_ID_ATENINTL, ATENINTL_DEVICE_ID_UC2322)},
226 {} /* terminating entry */
227 };
228
229 MODULE_DEVICE_TABLE(usb, moschip_id_table_combined);
230
231 /* This structure holds all of the local port information */
232
233 struct moschip_port {
234 int port_num; /*Actual port number in the device(1,2,etc) */
235 struct urb *write_urb; /* write URB for this port */
236 struct urb *read_urb; /* read URB for this port */
237 struct urb *int_urb;
238 __u8 shadowLCR; /* last LCR value received */
239 __u8 shadowMCR; /* last MCR value received */
240 char open;
241 char open_ports;
242 char zombie;
243 wait_queue_head_t wait_chase; /* for handling sleeping while waiting for chase to finish */
244 wait_queue_head_t delta_msr_wait; /* for handling sleeping while waiting for msr change to happen */
245 int delta_msr_cond;
246 struct async_icount icount;
247 struct usb_serial_port *port; /* loop back to the owner of this object */
248
249 /* Offsets */
250 __u8 SpRegOffset;
251 __u8 ControlRegOffset;
252 __u8 DcrRegOffset;
253 /* for processing control URBS in interrupt context */
254 struct urb *control_urb;
255 struct usb_ctrlrequest *dr;
256 char *ctrl_buf;
257 int MsrLsr;
258
259 spinlock_t pool_lock;
260 struct urb *write_urb_pool[NUM_URBS];
261 char busy[NUM_URBS];
262 bool read_urb_busy;
263 };
264
265
266 static int debug;
267
268 /*
269 * mos7840_set_reg_sync
270 * To set the Control register by calling usb_fill_control_urb function
271 * by passing usb_sndctrlpipe function as parameter.
272 */
273
274 static int mos7840_set_reg_sync(struct usb_serial_port *port, __u16 reg,
275 __u16 val)
276 {
277 struct usb_device *dev = port->serial->dev;
278 val = val & 0x00ff;
279 dbg("mos7840_set_reg_sync offset is %x, value %x", reg, val);
280
281 return usb_control_msg(dev, usb_sndctrlpipe(dev, 0), MCS_WRREQ,
282 MCS_WR_RTYPE, val, reg, NULL, 0,
283 MOS_WDR_TIMEOUT);
284 }
285
286 /*
287 * mos7840_get_reg_sync
288 * To set the Uart register by calling usb_fill_control_urb function by
289 * passing usb_rcvctrlpipe function as parameter.
290 */
291
292 static int mos7840_get_reg_sync(struct usb_serial_port *port, __u16 reg,
293 __u16 *val)
294 {
295 struct usb_device *dev = port->serial->dev;
296 int ret = 0;
297 u8 *buf;
298
299 buf = kmalloc(VENDOR_READ_LENGTH, GFP_KERNEL);
300 if (!buf)
301 return -ENOMEM;
302
303 ret = usb_control_msg(dev, usb_rcvctrlpipe(dev, 0), MCS_RDREQ,
304 MCS_RD_RTYPE, 0, reg, buf, VENDOR_READ_LENGTH,
305 MOS_WDR_TIMEOUT);
306 *val = buf[0];
307 dbg("mos7840_get_reg_sync offset is %x, return val %x", reg, *val);
308
309 kfree(buf);
310 return ret;
311 }
312
313 /*
314 * mos7840_set_uart_reg
315 * To set the Uart register by calling usb_fill_control_urb function by
316 * passing usb_sndctrlpipe function as parameter.
317 */
318
319 static int mos7840_set_uart_reg(struct usb_serial_port *port, __u16 reg,
320 __u16 val)
321 {
322
323 struct usb_device *dev = port->serial->dev;
324 val = val & 0x00ff;
325 /* For the UART control registers, the application number need
326 to be Or'ed */
327 if (port->serial->num_ports == 4) {
328 val |= (((__u16) port->number -
329 (__u16) (port->serial->minor)) + 1) << 8;
330 dbg("mos7840_set_uart_reg application number is %x", val);
331 } else {
332 if (((__u16) port->number - (__u16) (port->serial->minor)) == 0) {
333 val |= (((__u16) port->number -
334 (__u16) (port->serial->minor)) + 1) << 8;
335 dbg("mos7840_set_uart_reg application number is %x",
336 val);
337 } else {
338 val |=
339 (((__u16) port->number -
340 (__u16) (port->serial->minor)) + 2) << 8;
341 dbg("mos7840_set_uart_reg application number is %x",
342 val);
343 }
344 }
345 return usb_control_msg(dev, usb_sndctrlpipe(dev, 0), MCS_WRREQ,
346 MCS_WR_RTYPE, val, reg, NULL, 0,
347 MOS_WDR_TIMEOUT);
348
349 }
350
351 /*
352 * mos7840_get_uart_reg
353 * To set the Control register by calling usb_fill_control_urb function
354 * by passing usb_rcvctrlpipe function as parameter.
355 */
356 static int mos7840_get_uart_reg(struct usb_serial_port *port, __u16 reg,
357 __u16 *val)
358 {
359 struct usb_device *dev = port->serial->dev;
360 int ret = 0;
361 __u16 Wval;
362 u8 *buf;
363
364 buf = kmalloc(VENDOR_READ_LENGTH, GFP_KERNEL);
365 if (!buf)
366 return -ENOMEM;
367
368 /* dbg("application number is %4x",
369 (((__u16)port->number - (__u16)(port->serial->minor))+1)<<8); */
370 /* Wval is same as application number */
371 if (port->serial->num_ports == 4) {
372 Wval =
373 (((__u16) port->number - (__u16) (port->serial->minor)) +
374 1) << 8;
375 dbg("mos7840_get_uart_reg application number is %x", Wval);
376 } else {
377 if (((__u16) port->number - (__u16) (port->serial->minor)) == 0) {
378 Wval = (((__u16) port->number -
379 (__u16) (port->serial->minor)) + 1) << 8;
380 dbg("mos7840_get_uart_reg application number is %x",
381 Wval);
382 } else {
383 Wval = (((__u16) port->number -
384 (__u16) (port->serial->minor)) + 2) << 8;
385 dbg("mos7840_get_uart_reg application number is %x",
386 Wval);
387 }
388 }
389 ret = usb_control_msg(dev, usb_rcvctrlpipe(dev, 0), MCS_RDREQ,
390 MCS_RD_RTYPE, Wval, reg, buf, VENDOR_READ_LENGTH,
391 MOS_WDR_TIMEOUT);
392 *val = buf[0];
393
394 kfree(buf);
395 return ret;
396 }
397
398 static void mos7840_dump_serial_port(struct moschip_port *mos7840_port)
399 {
400
401 dbg("***************************************");
402 dbg("SpRegOffset is %2x", mos7840_port->SpRegOffset);
403 dbg("ControlRegOffset is %2x", mos7840_port->ControlRegOffset);
404 dbg("DCRRegOffset is %2x", mos7840_port->DcrRegOffset);
405 dbg("***************************************");
406
407 }
408
409 /************************************************************************/
410 /************************************************************************/
411 /* I N T E R F A C E F U N C T I O N S */
412 /* I N T E R F A C E F U N C T I O N S */
413 /************************************************************************/
414 /************************************************************************/
415
416 static inline void mos7840_set_port_private(struct usb_serial_port *port,
417 struct moschip_port *data)
418 {
419 usb_set_serial_port_data(port, (void *)data);
420 }
421
422 static inline struct moschip_port *mos7840_get_port_private(struct
423 usb_serial_port
424 *port)
425 {
426 return (struct moschip_port *)usb_get_serial_port_data(port);
427 }
428
429 static void mos7840_handle_new_msr(struct moschip_port *port, __u8 new_msr)
430 {
431 struct moschip_port *mos7840_port;
432 struct async_icount *icount;
433 mos7840_port = port;
434 icount = &mos7840_port->icount;
435 if (new_msr &
436 (MOS_MSR_DELTA_CTS | MOS_MSR_DELTA_DSR | MOS_MSR_DELTA_RI |
437 MOS_MSR_DELTA_CD)) {
438 icount = &mos7840_port->icount;
439
440 /* update input line counters */
441 if (new_msr & MOS_MSR_DELTA_CTS) {
442 icount->cts++;
443 smp_wmb();
444 }
445 if (new_msr & MOS_MSR_DELTA_DSR) {
446 icount->dsr++;
447 smp_wmb();
448 }
449 if (new_msr & MOS_MSR_DELTA_CD) {
450 icount->dcd++;
451 smp_wmb();
452 }
453 if (new_msr & MOS_MSR_DELTA_RI) {
454 icount->rng++;
455 smp_wmb();
456 }
457 }
458 }
459
460 static void mos7840_handle_new_lsr(struct moschip_port *port, __u8 new_lsr)
461 {
462 struct async_icount *icount;
463
464 dbg("%s - %02x", __func__, new_lsr);
465
466 if (new_lsr & SERIAL_LSR_BI) {
467 /*
468 * Parity and Framing errors only count if they
469 * occur exclusive of a break being
470 * received.
471 */
472 new_lsr &= (__u8) (SERIAL_LSR_OE | SERIAL_LSR_BI);
473 }
474
475 /* update input line counters */
476 icount = &port->icount;
477 if (new_lsr & SERIAL_LSR_BI) {
478 icount->brk++;
479 smp_wmb();
480 }
481 if (new_lsr & SERIAL_LSR_OE) {
482 icount->overrun++;
483 smp_wmb();
484 }
485 if (new_lsr & SERIAL_LSR_PE) {
486 icount->parity++;
487 smp_wmb();
488 }
489 if (new_lsr & SERIAL_LSR_FE) {
490 icount->frame++;
491 smp_wmb();
492 }
493 }
494
495 /************************************************************************/
496 /************************************************************************/
497 /* U S B C A L L B A C K F U N C T I O N S */
498 /* U S B C A L L B A C K F U N C T I O N S */
499 /************************************************************************/
500 /************************************************************************/
501
502 static void mos7840_control_callback(struct urb *urb)
503 {
504 unsigned char *data;
505 struct moschip_port *mos7840_port;
506 __u8 regval = 0x0;
507 int result = 0;
508 int status = urb->status;
509
510 mos7840_port = urb->context;
511
512 switch (status) {
513 case 0:
514 /* success */
515 break;
516 case -ECONNRESET:
517 case -ENOENT:
518 case -ESHUTDOWN:
519 /* this urb is terminated, clean up */
520 dbg("%s - urb shutting down with status: %d", __func__,
521 status);
522 return;
523 default:
524 dbg("%s - nonzero urb status received: %d", __func__,
525 status);
526 goto exit;
527 }
528
529 dbg("%s urb buffer size is %d", __func__, urb->actual_length);
530 dbg("%s mos7840_port->MsrLsr is %d port %d", __func__,
531 mos7840_port->MsrLsr, mos7840_port->port_num);
532 data = urb->transfer_buffer;
533 regval = (__u8) data[0];
534 dbg("%s data is %x", __func__, regval);
535 if (mos7840_port->MsrLsr == 0)
536 mos7840_handle_new_msr(mos7840_port, regval);
537 else if (mos7840_port->MsrLsr == 1)
538 mos7840_handle_new_lsr(mos7840_port, regval);
539
540 exit:
541 spin_lock(&mos7840_port->pool_lock);
542 if (!mos7840_port->zombie)
543 result = usb_submit_urb(mos7840_port->int_urb, GFP_ATOMIC);
544 spin_unlock(&mos7840_port->pool_lock);
545 if (result) {
546 dev_err(&urb->dev->dev,
547 "%s - Error %d submitting interrupt urb\n",
548 __func__, result);
549 }
550 }
551
552 static int mos7840_get_reg(struct moschip_port *mcs, __u16 Wval, __u16 reg,
553 __u16 *val)
554 {
555 struct usb_device *dev = mcs->port->serial->dev;
556 struct usb_ctrlrequest *dr = mcs->dr;
557 unsigned char *buffer = mcs->ctrl_buf;
558 int ret;
559
560 dr->bRequestType = MCS_RD_RTYPE;
561 dr->bRequest = MCS_RDREQ;
562 dr->wValue = cpu_to_le16(Wval); /* 0 */
563 dr->wIndex = cpu_to_le16(reg);
564 dr->wLength = cpu_to_le16(2);
565
566 usb_fill_control_urb(mcs->control_urb, dev, usb_rcvctrlpipe(dev, 0),
567 (unsigned char *)dr, buffer, 2,
568 mos7840_control_callback, mcs);
569 mcs->control_urb->transfer_buffer_length = 2;
570 ret = usb_submit_urb(mcs->control_urb, GFP_ATOMIC);
571 return ret;
572 }
573
574 /*****************************************************************************
575 * mos7840_interrupt_callback
576 * this is the callback function for when we have received data on the
577 * interrupt endpoint.
578 *****************************************************************************/
579
580 static void mos7840_interrupt_callback(struct urb *urb)
581 {
582 int result;
583 int length;
584 struct moschip_port *mos7840_port;
585 struct usb_serial *serial;
586 __u16 Data;
587 unsigned char *data;
588 __u8 sp[5], st;
589 int i, rv = 0;
590 __u16 wval, wreg = 0;
591 int status = urb->status;
592
593 dbg("%s", " : Entering");
594
595 switch (status) {
596 case 0:
597 /* success */
598 break;
599 case -ECONNRESET:
600 case -ENOENT:
601 case -ESHUTDOWN:
602 /* this urb is terminated, clean up */
603 dbg("%s - urb shutting down with status: %d", __func__,
604 status);
605 return;
606 default:
607 dbg("%s - nonzero urb status received: %d", __func__,
608 status);
609 goto exit;
610 }
611
612 length = urb->actual_length;
613 data = urb->transfer_buffer;
614
615 serial = urb->context;
616
617 /* Moschip get 5 bytes
618 * Byte 1 IIR Port 1 (port.number is 0)
619 * Byte 2 IIR Port 2 (port.number is 1)
620 * Byte 3 IIR Port 3 (port.number is 2)
621 * Byte 4 IIR Port 4 (port.number is 3)
622 * Byte 5 FIFO status for both */
623
624 if (length && length > 5) {
625 dbg("%s", "Wrong data !!!");
626 return;
627 }
628
629 sp[0] = (__u8) data[0];
630 sp[1] = (__u8) data[1];
631 sp[2] = (__u8) data[2];
632 sp[3] = (__u8) data[3];
633 st = (__u8) data[4];
634
635 for (i = 0; i < serial->num_ports; i++) {
636 mos7840_port = mos7840_get_port_private(serial->port[i]);
637 wval =
638 (((__u16) serial->port[i]->number -
639 (__u16) (serial->minor)) + 1) << 8;
640 if (mos7840_port->open) {
641 if (sp[i] & 0x01) {
642 dbg("SP%d No Interrupt !!!", i);
643 } else {
644 switch (sp[i] & 0x0f) {
645 case SERIAL_IIR_RLS:
646 dbg("Serial Port %d: Receiver status error or ", i);
647 dbg("address bit detected in 9-bit mode");
648 mos7840_port->MsrLsr = 1;
649 wreg = LINE_STATUS_REGISTER;
650 break;
651 case SERIAL_IIR_MS:
652 dbg("Serial Port %d: Modem status change", i);
653 mos7840_port->MsrLsr = 0;
654 wreg = MODEM_STATUS_REGISTER;
655 break;
656 }
657 spin_lock(&mos7840_port->pool_lock);
658 if (!mos7840_port->zombie) {
659 rv = mos7840_get_reg(mos7840_port, wval, wreg, &Data);
660 } else {
661 spin_unlock(&mos7840_port->pool_lock);
662 return;
663 }
664 spin_unlock(&mos7840_port->pool_lock);
665 }
666 }
667 }
668 if (!(rv < 0))
669 /* the completion handler for the control urb will resubmit */
670 return;
671 exit:
672 result = usb_submit_urb(urb, GFP_ATOMIC);
673 if (result) {
674 dev_err(&urb->dev->dev,
675 "%s - Error %d submitting interrupt urb\n",
676 __func__, result);
677 }
678 }
679
680 static int mos7840_port_paranoia_check(struct usb_serial_port *port,
681 const char *function)
682 {
683 if (!port) {
684 dbg("%s - port == NULL", function);
685 return -1;
686 }
687 if (!port->serial) {
688 dbg("%s - port->serial == NULL", function);
689 return -1;
690 }
691
692 return 0;
693 }
694
695 /* Inline functions to check the sanity of a pointer that is passed to us */
696 static int mos7840_serial_paranoia_check(struct usb_serial *serial,
697 const char *function)
698 {
699 if (!serial) {
700 dbg("%s - serial == NULL", function);
701 return -1;
702 }
703 if (!serial->type) {
704 dbg("%s - serial->type == NULL!", function);
705 return -1;
706 }
707
708 return 0;
709 }
710
711 static struct usb_serial *mos7840_get_usb_serial(struct usb_serial_port *port,
712 const char *function)
713 {
714 /* if no port was specified, or it fails a paranoia check */
715 if (!port ||
716 mos7840_port_paranoia_check(port, function) ||
717 mos7840_serial_paranoia_check(port->serial, function)) {
718 /* then say that we don't have a valid usb_serial thing,
719 * which will end up genrating -ENODEV return values */
720 return NULL;
721 }
722
723 return port->serial;
724 }
725
726 /*****************************************************************************
727 * mos7840_bulk_in_callback
728 * this is the callback function for when we have received data on the
729 * bulk in endpoint.
730 *****************************************************************************/
731
732 static void mos7840_bulk_in_callback(struct urb *urb)
733 {
734 int retval;
735 unsigned char *data;
736 struct usb_serial *serial;
737 struct usb_serial_port *port;
738 struct moschip_port *mos7840_port;
739 struct tty_struct *tty;
740 int status = urb->status;
741
742 mos7840_port = urb->context;
743 if (!mos7840_port) {
744 dbg("%s", "NULL mos7840_port pointer");
745 return;
746 }
747
748 if (status) {
749 dbg("nonzero read bulk status received: %d", status);
750 mos7840_port->read_urb_busy = false;
751 return;
752 }
753
754 port = (struct usb_serial_port *)mos7840_port->port;
755 if (mos7840_port_paranoia_check(port, __func__)) {
756 dbg("%s", "Port Paranoia failed");
757 mos7840_port->read_urb_busy = false;
758 return;
759 }
760
761 serial = mos7840_get_usb_serial(port, __func__);
762 if (!serial) {
763 dbg("%s", "Bad serial pointer");
764 mos7840_port->read_urb_busy = false;
765 return;
766 }
767
768 dbg("%s", "Entering... ");
769
770 data = urb->transfer_buffer;
771
772 dbg("%s", "Entering ...........");
773
774 if (urb->actual_length) {
775 tty = tty_port_tty_get(&mos7840_port->port->port);
776 if (tty) {
777 tty_insert_flip_string(tty, data, urb->actual_length);
778 dbg(" %s ", data);
779 tty_flip_buffer_push(tty);
780 tty_kref_put(tty);
781 }
782 mos7840_port->icount.rx += urb->actual_length;
783 smp_wmb();
784 dbg("mos7840_port->icount.rx is %d:",
785 mos7840_port->icount.rx);
786 }
787
788 if (!mos7840_port->read_urb) {
789 dbg("%s", "URB KILLED !!!");
790 mos7840_port->read_urb_busy = false;
791 return;
792 }
793
794
795 mos7840_port->read_urb_busy = true;
796 retval = usb_submit_urb(mos7840_port->read_urb, GFP_ATOMIC);
797
798 if (retval) {
799 dbg("usb_submit_urb(read bulk) failed, retval = %d", retval);
800 mos7840_port->read_urb_busy = false;
801 }
802 }
803
804 /*****************************************************************************
805 * mos7840_bulk_out_data_callback
806 * this is the callback function for when we have finished sending
807 * serial data on the bulk out endpoint.
808 *****************************************************************************/
809
810 static void mos7840_bulk_out_data_callback(struct urb *urb)
811 {
812 struct moschip_port *mos7840_port;
813 struct tty_struct *tty;
814 int status = urb->status;
815 int i;
816
817 mos7840_port = urb->context;
818 spin_lock(&mos7840_port->pool_lock);
819 for (i = 0; i < NUM_URBS; i++) {
820 if (urb == mos7840_port->write_urb_pool[i]) {
821 mos7840_port->busy[i] = 0;
822 break;
823 }
824 }
825 spin_unlock(&mos7840_port->pool_lock);
826
827 if (status) {
828 dbg("nonzero write bulk status received:%d", status);
829 return;
830 }
831
832 if (mos7840_port_paranoia_check(mos7840_port->port, __func__)) {
833 dbg("%s", "Port Paranoia failed");
834 return;
835 }
836
837 dbg("%s", "Entering .........");
838
839 tty = tty_port_tty_get(&mos7840_port->port->port);
840 if (tty && mos7840_port->open)
841 tty_wakeup(tty);
842 tty_kref_put(tty);
843
844 }
845
846 /************************************************************************/
847 /* 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 */
848 /************************************************************************/
849 #ifdef MCSSerialProbe
850 static int mos7840_serial_probe(struct usb_serial *serial,
851 const struct usb_device_id *id)
852 {
853
854 /*need to implement the mode_reg reading and updating\
855 structures usb_serial_ device_type\
856 (i.e num_ports, num_bulkin,bulkout etc) */
857 /* Also we can update the changes attach */
858 return 1;
859 }
860 #endif
861
862 /*****************************************************************************
863 * mos7840_open
864 * this function is called by the tty driver when a port is opened
865 * If successful, we return 0
866 * Otherwise we return a negative error number.
867 *****************************************************************************/
868
869 static int mos7840_open(struct tty_struct *tty, struct usb_serial_port *port)
870 {
871 int response;
872 int j;
873 struct usb_serial *serial;
874 struct urb *urb;
875 __u16 Data;
876 int status;
877 struct moschip_port *mos7840_port;
878 struct moschip_port *port0;
879
880 dbg ("%s enter", __func__);
881
882 if (mos7840_port_paranoia_check(port, __func__)) {
883 dbg("%s", "Port Paranoia failed");
884 return -ENODEV;
885 }
886
887 serial = port->serial;
888
889 if (mos7840_serial_paranoia_check(serial, __func__)) {
890 dbg("%s", "Serial Paranoia failed");
891 return -ENODEV;
892 }
893
894 mos7840_port = mos7840_get_port_private(port);
895 port0 = mos7840_get_port_private(serial->port[0]);
896
897 if (mos7840_port == NULL || port0 == NULL)
898 return -ENODEV;
899
900 usb_clear_halt(serial->dev, port->write_urb->pipe);
901 usb_clear_halt(serial->dev, port->read_urb->pipe);
902 port0->open_ports++;
903
904 /* Initialising the write urb pool */
905 for (j = 0; j < NUM_URBS; ++j) {
906 urb = usb_alloc_urb(0, GFP_KERNEL);
907 mos7840_port->write_urb_pool[j] = urb;
908
909 if (urb == NULL) {
910 dev_err(&port->dev, "No more urbs???\n");
911 continue;
912 }
913
914 urb->transfer_buffer = kmalloc(URB_TRANSFER_BUFFER_SIZE,
915 GFP_KERNEL);
916 if (!urb->transfer_buffer) {
917 usb_free_urb(urb);
918 mos7840_port->write_urb_pool[j] = NULL;
919 dev_err(&port->dev,
920 "%s-out of memory for urb buffers.\n",
921 __func__);
922 continue;
923 }
924 }
925
926 /*****************************************************************************
927 * Initialize MCS7840 -- Write Init values to corresponding Registers
928 *
929 * Register Index
930 * 1 : IER
931 * 2 : FCR
932 * 3 : LCR
933 * 4 : MCR
934 *
935 * 0x08 : SP1/2 Control Reg
936 *****************************************************************************/
937
938 /* NEED to check the following Block */
939
940 Data = 0x0;
941 status = mos7840_get_reg_sync(port, mos7840_port->SpRegOffset, &Data);
942 if (status < 0) {
943 dbg("Reading Spreg failed");
944 return -1;
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
953 Data &= ~0x80;
954 status = mos7840_set_reg_sync(port, mos7840_port->SpRegOffset, Data);
955 if (status < 0) {
956 dbg("writing Spreg failed");
957 return -1;
958 }
959 /* End of block to be checked */
960
961 Data = 0x0;
962 status = mos7840_get_reg_sync(port, mos7840_port->ControlRegOffset,
963 &Data);
964 if (status < 0) {
965 dbg("Reading Controlreg failed");
966 return -1;
967 }
968 Data |= 0x08; /* Driver done bit */
969 Data |= 0x20; /* rx_disable */
970 status = mos7840_set_reg_sync(port,
971 mos7840_port->ControlRegOffset, Data);
972 if (status < 0) {
973 dbg("writing Controlreg failed");
974 return -1;
975 }
976 /* do register settings here */
977 /* Set all regs to the device default values. */
978 /***********************************
979 * First Disable all interrupts.
980 ***********************************/
981 Data = 0x00;
982 status = mos7840_set_uart_reg(port, INTERRUPT_ENABLE_REGISTER, Data);
983 if (status < 0) {
984 dbg("disabling interrupts failed");
985 return -1;
986 }
987 /* Set FIFO_CONTROL_REGISTER to the default value */
988 Data = 0x00;
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 = 0xcf;
996 status = mos7840_set_uart_reg(port, FIFO_CONTROL_REGISTER, Data);
997 if (status < 0) {
998 dbg("Writing FIFO_CONTROL_REGISTER failed");
999 return -1;
1000 }
1001
1002 Data = 0x03;
1003 status = mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data);
1004 mos7840_port->shadowLCR = Data;
1005
1006 Data = 0x0b;
1007 status = mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER, Data);
1008 mos7840_port->shadowMCR = Data;
1009
1010 Data = 0x00;
1011 status = mos7840_get_uart_reg(port, LINE_CONTROL_REGISTER, &Data);
1012 mos7840_port->shadowLCR = Data;
1013
1014 Data |= SERIAL_LCR_DLAB; /* data latch enable in LCR 0x80 */
1015 status = mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data);
1016
1017 Data = 0x0c;
1018 status = mos7840_set_uart_reg(port, DIVISOR_LATCH_LSB, Data);
1019
1020 Data = 0x0;
1021 status = mos7840_set_uart_reg(port, DIVISOR_LATCH_MSB, Data);
1022
1023 Data = 0x00;
1024 status = mos7840_get_uart_reg(port, LINE_CONTROL_REGISTER, &Data);
1025
1026 Data = Data & ~SERIAL_LCR_DLAB;
1027 status = mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data);
1028 mos7840_port->shadowLCR = Data;
1029
1030 /* clearing Bulkin and Bulkout Fifo */
1031 Data = 0x0;
1032 status = mos7840_get_reg_sync(port, mos7840_port->SpRegOffset, &Data);
1033
1034 Data = Data | 0x0c;
1035 status = mos7840_set_reg_sync(port, mos7840_port->SpRegOffset, Data);
1036
1037 Data = Data & ~0x0c;
1038 status = mos7840_set_reg_sync(port, mos7840_port->SpRegOffset, Data);
1039 /* Finally enable all interrupts */
1040 Data = 0x0c;
1041 status = mos7840_set_uart_reg(port, INTERRUPT_ENABLE_REGISTER, Data);
1042
1043 /* clearing rx_disable */
1044 Data = 0x0;
1045 status = mos7840_get_reg_sync(port, mos7840_port->ControlRegOffset,
1046 &Data);
1047 Data = Data & ~0x20;
1048 status = mos7840_set_reg_sync(port, mos7840_port->ControlRegOffset,
1049 Data);
1050
1051 /* rx_negate */
1052 Data = 0x0;
1053 status = mos7840_get_reg_sync(port, mos7840_port->ControlRegOffset,
1054 &Data);
1055 Data = Data | 0x10;
1056 status = mos7840_set_reg_sync(port, mos7840_port->ControlRegOffset,
1057 Data);
1058
1059 /* Check to see if we've set up our endpoint info yet *
1060 * (can't set it up in mos7840_startup as the structures *
1061 * were not set up at that time.) */
1062 if (port0->open_ports == 1) {
1063 if (serial->port[0]->interrupt_in_buffer == NULL) {
1064 /* set up interrupt urb */
1065 usb_fill_int_urb(serial->port[0]->interrupt_in_urb,
1066 serial->dev,
1067 usb_rcvintpipe(serial->dev,
1068 serial->port[0]->interrupt_in_endpointAddress),
1069 serial->port[0]->interrupt_in_buffer,
1070 serial->port[0]->interrupt_in_urb->
1071 transfer_buffer_length,
1072 mos7840_interrupt_callback,
1073 serial,
1074 serial->port[0]->interrupt_in_urb->interval);
1075
1076 /* start interrupt read for mos7840 *
1077 * will continue as long as mos7840 is connected */
1078
1079 response =
1080 usb_submit_urb(serial->port[0]->interrupt_in_urb,
1081 GFP_KERNEL);
1082 if (response) {
1083 dev_err(&port->dev, "%s - Error %d submitting "
1084 "interrupt urb\n", __func__, response);
1085 }
1086
1087 }
1088
1089 }
1090
1091 /* see if we've set up our endpoint info yet *
1092 * (can't set it up in mos7840_startup as the *
1093 * structures were not set up at that time.) */
1094
1095 dbg("port number is %d", port->number);
1096 dbg("serial number is %d", port->serial->minor);
1097 dbg("Bulkin endpoint is %d", port->bulk_in_endpointAddress);
1098 dbg("BulkOut endpoint is %d", port->bulk_out_endpointAddress);
1099 dbg("Interrupt endpoint is %d", port->interrupt_in_endpointAddress);
1100 dbg("port's number in the device is %d", mos7840_port->port_num);
1101 mos7840_port->read_urb = port->read_urb;
1102
1103 /* set up our bulk in urb */
1104
1105 usb_fill_bulk_urb(mos7840_port->read_urb,
1106 serial->dev,
1107 usb_rcvbulkpipe(serial->dev,
1108 port->bulk_in_endpointAddress),
1109 port->bulk_in_buffer,
1110 mos7840_port->read_urb->transfer_buffer_length,
1111 mos7840_bulk_in_callback, mos7840_port);
1112
1113 dbg("mos7840_open: bulkin endpoint is %d",
1114 port->bulk_in_endpointAddress);
1115 mos7840_port->read_urb_busy = true;
1116 response = usb_submit_urb(mos7840_port->read_urb, GFP_KERNEL);
1117 if (response) {
1118 dev_err(&port->dev, "%s - Error %d submitting control urb\n",
1119 __func__, response);
1120 mos7840_port->read_urb_busy = false;
1121 }
1122
1123 /* initialize our wait queues */
1124 init_waitqueue_head(&mos7840_port->wait_chase);
1125 init_waitqueue_head(&mos7840_port->delta_msr_wait);
1126
1127 /* initialize our icount structure */
1128 memset(&(mos7840_port->icount), 0x00, sizeof(mos7840_port->icount));
1129
1130 /* initialize our port settings */
1131 /* Must set to enable ints! */
1132 mos7840_port->shadowMCR = MCR_MASTER_IE;
1133 /* send a open port command */
1134 mos7840_port->open = 1;
1135 /* mos7840_change_port_settings(mos7840_port,old_termios); */
1136 mos7840_port->icount.tx = 0;
1137 mos7840_port->icount.rx = 0;
1138
1139 dbg("usb_serial serial:%p mos7840_port:%p\n usb_serial_port port:%p",
1140 serial, mos7840_port, port);
1141
1142 dbg ("%s leave", __func__);
1143
1144 return 0;
1145
1146 }
1147
1148 /*****************************************************************************
1149 * mos7840_chars_in_buffer
1150 * this function is called by the tty driver when it wants to know how many
1151 * bytes of data we currently have outstanding in the port (data that has
1152 * been written, but hasn't made it out the port yet)
1153 * If successful, we return the number of bytes left to be written in the
1154 * system,
1155 * Otherwise we return zero.
1156 *****************************************************************************/
1157
1158 static int mos7840_chars_in_buffer(struct tty_struct *tty)
1159 {
1160 struct usb_serial_port *port = tty->driver_data;
1161 int i;
1162 int chars = 0;
1163 unsigned long flags;
1164 struct moschip_port *mos7840_port;
1165
1166 dbg("%s", " mos7840_chars_in_buffer:entering ...........");
1167
1168 if (mos7840_port_paranoia_check(port, __func__)) {
1169 dbg("%s", "Invalid port");
1170 return 0;
1171 }
1172
1173 mos7840_port = mos7840_get_port_private(port);
1174 if (mos7840_port == NULL) {
1175 dbg("%s", "mos7840_break:leaving ...........");
1176 return 0;
1177 }
1178
1179 spin_lock_irqsave(&mos7840_port->pool_lock, flags);
1180 for (i = 0; i < NUM_URBS; ++i)
1181 if (mos7840_port->busy[i])
1182 chars += URB_TRANSFER_BUFFER_SIZE;
1183 spin_unlock_irqrestore(&mos7840_port->pool_lock, flags);
1184 dbg("%s - returns %d", __func__, chars);
1185 return chars;
1186
1187 }
1188
1189 /*****************************************************************************
1190 * mos7840_close
1191 * this function is called by the tty driver when a port is closed
1192 *****************************************************************************/
1193
1194 static void mos7840_close(struct usb_serial_port *port)
1195 {
1196 struct usb_serial *serial;
1197 struct moschip_port *mos7840_port;
1198 struct moschip_port *port0;
1199 int j;
1200 __u16 Data;
1201
1202 dbg("%s", "mos7840_close:entering...");
1203
1204 if (mos7840_port_paranoia_check(port, __func__)) {
1205 dbg("%s", "Port Paranoia failed");
1206 return;
1207 }
1208
1209 serial = mos7840_get_usb_serial(port, __func__);
1210 if (!serial) {
1211 dbg("%s", "Serial Paranoia failed");
1212 return;
1213 }
1214
1215 mos7840_port = mos7840_get_port_private(port);
1216 port0 = mos7840_get_port_private(serial->port[0]);
1217
1218 if (mos7840_port == NULL || port0 == NULL)
1219 return;
1220
1221 for (j = 0; j < NUM_URBS; ++j)
1222 usb_kill_urb(mos7840_port->write_urb_pool[j]);
1223
1224 /* Freeing Write URBs */
1225 for (j = 0; j < NUM_URBS; ++j) {
1226 if (mos7840_port->write_urb_pool[j]) {
1227 if (mos7840_port->write_urb_pool[j]->transfer_buffer)
1228 kfree(mos7840_port->write_urb_pool[j]->
1229 transfer_buffer);
1230
1231 usb_free_urb(mos7840_port->write_urb_pool[j]);
1232 }
1233 }
1234
1235 /* While closing port, shutdown all bulk read, write *
1236 * and interrupt read if they exists */
1237 if (serial->dev) {
1238 if (mos7840_port->write_urb) {
1239 dbg("%s", "Shutdown bulk write");
1240 usb_kill_urb(mos7840_port->write_urb);
1241 }
1242 if (mos7840_port->read_urb) {
1243 dbg("%s", "Shutdown bulk read");
1244 usb_kill_urb(mos7840_port->read_urb);
1245 mos7840_port->read_urb_busy = false;
1246 }
1247 if ((&mos7840_port->control_urb)) {
1248 dbg("%s", "Shutdown control read");
1249 /*/ usb_kill_urb (mos7840_port->control_urb); */
1250 }
1251 }
1252 /* if(mos7840_port->ctrl_buf != NULL) */
1253 /* kfree(mos7840_port->ctrl_buf); */
1254 port0->open_ports--;
1255 dbg("mos7840_num_open_ports in close%d:in port%d",
1256 port0->open_ports, port->number);
1257 if (port0->open_ports == 0) {
1258 if (serial->port[0]->interrupt_in_urb) {
1259 dbg("%s", "Shutdown interrupt_in_urb");
1260 usb_kill_urb(serial->port[0]->interrupt_in_urb);
1261 }
1262 }
1263
1264 if (mos7840_port->write_urb) {
1265 /* if this urb had a transfer buffer already (old tx) free it */
1266 if (mos7840_port->write_urb->transfer_buffer != NULL)
1267 kfree(mos7840_port->write_urb->transfer_buffer);
1268 usb_free_urb(mos7840_port->write_urb);
1269 }
1270
1271 Data = 0x0;
1272 mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER, Data);
1273
1274 Data = 0x00;
1275 mos7840_set_uart_reg(port, INTERRUPT_ENABLE_REGISTER, Data);
1276
1277 mos7840_port->open = 0;
1278
1279 dbg("%s", "Leaving ............");
1280 }
1281
1282 /************************************************************************
1283 *
1284 * mos7840_block_until_chase_response
1285 *
1286 * This function will block the close until one of the following:
1287 * 1. Response to our Chase comes from mos7840
1288 * 2. A timeout of 10 seconds without activity has expired
1289 * (1K of mos7840 data @ 2400 baud ==> 4 sec to empty)
1290 *
1291 ************************************************************************/
1292
1293 static void mos7840_block_until_chase_response(struct tty_struct *tty,
1294 struct moschip_port *mos7840_port)
1295 {
1296 int timeout = 1 * HZ;
1297 int wait = 10;
1298 int count;
1299
1300 while (1) {
1301 count = mos7840_chars_in_buffer(tty);
1302
1303 /* Check for Buffer status */
1304 if (count <= 0)
1305 return;
1306
1307 /* Block the thread for a while */
1308 interruptible_sleep_on_timeout(&mos7840_port->wait_chase,
1309 timeout);
1310 /* No activity.. count down section */
1311 wait--;
1312 if (wait == 0) {
1313 dbg("%s - TIMEOUT", __func__);
1314 return;
1315 } else {
1316 /* Reset timeout value back to seconds */
1317 wait = 10;
1318 }
1319 }
1320
1321 }
1322
1323 /*****************************************************************************
1324 * mos7840_break
1325 * this function sends a break to the port
1326 *****************************************************************************/
1327 static void mos7840_break(struct tty_struct *tty, int break_state)
1328 {
1329 struct usb_serial_port *port = tty->driver_data;
1330 unsigned char data;
1331 struct usb_serial *serial;
1332 struct moschip_port *mos7840_port;
1333
1334 dbg("%s", "Entering ...........");
1335 dbg("mos7840_break: Start");
1336
1337 if (mos7840_port_paranoia_check(port, __func__)) {
1338 dbg("%s", "Port Paranoia failed");
1339 return;
1340 }
1341
1342 serial = mos7840_get_usb_serial(port, __func__);
1343 if (!serial) {
1344 dbg("%s", "Serial Paranoia failed");
1345 return;
1346 }
1347
1348 mos7840_port = mos7840_get_port_private(port);
1349
1350 if (mos7840_port == NULL)
1351 return;
1352
1353 if (serial->dev)
1354 /* flush and block until tx is empty */
1355 mos7840_block_until_chase_response(tty, mos7840_port);
1356
1357 if (break_state == -1)
1358 data = mos7840_port->shadowLCR | LCR_SET_BREAK;
1359 else
1360 data = mos7840_port->shadowLCR & ~LCR_SET_BREAK;
1361
1362 /* FIXME: no locking on shadowLCR anywhere in driver */
1363 mos7840_port->shadowLCR = data;
1364 dbg("mcs7840_break mos7840_port->shadowLCR is %x",
1365 mos7840_port->shadowLCR);
1366 mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER,
1367 mos7840_port->shadowLCR);
1368 }
1369
1370 /*****************************************************************************
1371 * mos7840_write_room
1372 * this function is called by the tty driver when it wants to know how many
1373 * bytes of data we can accept for a specific port.
1374 * If successful, we return the amount of room that we have for this port
1375 * Otherwise we return a negative error number.
1376 *****************************************************************************/
1377
1378 static int mos7840_write_room(struct tty_struct *tty)
1379 {
1380 struct usb_serial_port *port = tty->driver_data;
1381 int i;
1382 int room = 0;
1383 unsigned long flags;
1384 struct moschip_port *mos7840_port;
1385
1386 dbg("%s", " mos7840_write_room:entering ...........");
1387
1388 if (mos7840_port_paranoia_check(port, __func__)) {
1389 dbg("%s", "Invalid port");
1390 dbg("%s", " mos7840_write_room:leaving ...........");
1391 return -1;
1392 }
1393
1394 mos7840_port = mos7840_get_port_private(port);
1395 if (mos7840_port == NULL) {
1396 dbg("%s", "mos7840_break:leaving ...........");
1397 return -1;
1398 }
1399
1400 spin_lock_irqsave(&mos7840_port->pool_lock, flags);
1401 for (i = 0; i < NUM_URBS; ++i) {
1402 if (!mos7840_port->busy[i])
1403 room += URB_TRANSFER_BUFFER_SIZE;
1404 }
1405 spin_unlock_irqrestore(&mos7840_port->pool_lock, flags);
1406
1407 room = (room == 0) ? 0 : room - URB_TRANSFER_BUFFER_SIZE + 1;
1408 dbg("%s - returns %d", __func__, room);
1409 return room;
1410
1411 }
1412
1413 /*****************************************************************************
1414 * mos7840_write
1415 * this function is called by the tty driver when data should be written to
1416 * the port.
1417 * If successful, we return the number of bytes written, otherwise we
1418 * return a negative error number.
1419 *****************************************************************************/
1420
1421 static int mos7840_write(struct tty_struct *tty, struct usb_serial_port *port,
1422 const unsigned char *data, int count)
1423 {
1424 int status;
1425 int i;
1426 int bytes_sent = 0;
1427 int transfer_size;
1428 unsigned long flags;
1429
1430 struct moschip_port *mos7840_port;
1431 struct usb_serial *serial;
1432 struct urb *urb;
1433 /* __u16 Data; */
1434 const unsigned char *current_position = data;
1435 unsigned char *data1;
1436 dbg("%s", "entering ...........");
1437 /* dbg("mos7840_write: mos7840_port->shadowLCR is %x",
1438 mos7840_port->shadowLCR); */
1439
1440 #ifdef NOTMOS7840
1441 Data = 0x00;
1442 status = mos7840_get_uart_reg(port, LINE_CONTROL_REGISTER, &Data);
1443 mos7840_port->shadowLCR = Data;
1444 dbg("mos7840_write: LINE_CONTROL_REGISTER is %x", Data);
1445 dbg("mos7840_write: mos7840_port->shadowLCR is %x",
1446 mos7840_port->shadowLCR);
1447
1448 /* Data = 0x03; */
1449 /* status = mos7840_set_uart_reg(port,LINE_CONTROL_REGISTER,Data); */
1450 /* mos7840_port->shadowLCR=Data;//Need to add later */
1451
1452 Data |= SERIAL_LCR_DLAB; /* data latch enable in LCR 0x80 */
1453 status = mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data);
1454
1455 /* Data = 0x0c; */
1456 /* status = mos7840_set_uart_reg(port,DIVISOR_LATCH_LSB,Data); */
1457 Data = 0x00;
1458 status = mos7840_get_uart_reg(port, DIVISOR_LATCH_LSB, &Data);
1459 dbg("mos7840_write:DLL value is %x", Data);
1460
1461 Data = 0x0;
1462 status = mos7840_get_uart_reg(port, DIVISOR_LATCH_MSB, &Data);
1463 dbg("mos7840_write:DLM value is %x", Data);
1464
1465 Data = Data & ~SERIAL_LCR_DLAB;
1466 dbg("mos7840_write: mos7840_port->shadowLCR is %x",
1467 mos7840_port->shadowLCR);
1468 status = mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data);
1469 #endif
1470
1471 if (mos7840_port_paranoia_check(port, __func__)) {
1472 dbg("%s", "Port Paranoia failed");
1473 return -1;
1474 }
1475
1476 serial = port->serial;
1477 if (mos7840_serial_paranoia_check(serial, __func__)) {
1478 dbg("%s", "Serial Paranoia failed");
1479 return -1;
1480 }
1481
1482 mos7840_port = mos7840_get_port_private(port);
1483 if (mos7840_port == NULL) {
1484 dbg("%s", "mos7840_port is NULL");
1485 return -1;
1486 }
1487
1488 /* try to find a free urb in the list */
1489 urb = NULL;
1490
1491 spin_lock_irqsave(&mos7840_port->pool_lock, flags);
1492 for (i = 0; i < NUM_URBS; ++i) {
1493 if (!mos7840_port->busy[i]) {
1494 mos7840_port->busy[i] = 1;
1495 urb = mos7840_port->write_urb_pool[i];
1496 dbg("URB:%d", i);
1497 break;
1498 }
1499 }
1500 spin_unlock_irqrestore(&mos7840_port->pool_lock, flags);
1501
1502 if (urb == NULL) {
1503 dbg("%s - no more free urbs", __func__);
1504 goto exit;
1505 }
1506
1507 if (urb->transfer_buffer == NULL) {
1508 urb->transfer_buffer =
1509 kmalloc(URB_TRANSFER_BUFFER_SIZE, GFP_KERNEL);
1510
1511 if (urb->transfer_buffer == NULL) {
1512 dev_err(&port->dev, "%s no more kernel memory...\n",
1513 __func__);
1514 goto exit;
1515 }
1516 }
1517 transfer_size = min(count, URB_TRANSFER_BUFFER_SIZE);
1518
1519 memcpy(urb->transfer_buffer, current_position, transfer_size);
1520
1521 /* fill urb with data and submit */
1522 usb_fill_bulk_urb(urb,
1523 serial->dev,
1524 usb_sndbulkpipe(serial->dev,
1525 port->bulk_out_endpointAddress),
1526 urb->transfer_buffer,
1527 transfer_size,
1528 mos7840_bulk_out_data_callback, mos7840_port);
1529
1530 data1 = urb->transfer_buffer;
1531 dbg("bulkout endpoint is %d", port->bulk_out_endpointAddress);
1532
1533 /* send it down the pipe */
1534 status = usb_submit_urb(urb, GFP_ATOMIC);
1535
1536 if (status) {
1537 mos7840_port->busy[i] = 0;
1538 dev_err(&port->dev, "%s - usb_submit_urb(write bulk) failed "
1539 "with status = %d\n", __func__, status);
1540 bytes_sent = status;
1541 goto exit;
1542 }
1543 bytes_sent = transfer_size;
1544 mos7840_port->icount.tx += transfer_size;
1545 smp_wmb();
1546 dbg("mos7840_port->icount.tx is %d:", mos7840_port->icount.tx);
1547 exit:
1548 return bytes_sent;
1549
1550 }
1551
1552 /*****************************************************************************
1553 * mos7840_throttle
1554 * this function is called by the tty driver when it wants to stop the data
1555 * being read from the port.
1556 *****************************************************************************/
1557
1558 static void mos7840_throttle(struct tty_struct *tty)
1559 {
1560 struct usb_serial_port *port = tty->driver_data;
1561 struct moschip_port *mos7840_port;
1562 int status;
1563
1564 if (mos7840_port_paranoia_check(port, __func__)) {
1565 dbg("%s", "Invalid port");
1566 return;
1567 }
1568
1569 dbg("- port %d", port->number);
1570
1571 mos7840_port = mos7840_get_port_private(port);
1572
1573 if (mos7840_port == NULL)
1574 return;
1575
1576 if (!mos7840_port->open) {
1577 dbg("%s", "port not opened");
1578 return;
1579 }
1580
1581 dbg("%s", "Entering ..........");
1582
1583 /* if we are implementing XON/XOFF, send the stop character */
1584 if (I_IXOFF(tty)) {
1585 unsigned char stop_char = STOP_CHAR(tty);
1586 status = mos7840_write(tty, port, &stop_char, 1);
1587 if (status <= 0)
1588 return;
1589 }
1590 /* if we are implementing RTS/CTS, toggle that line */
1591 if (tty->termios->c_cflag & CRTSCTS) {
1592 mos7840_port->shadowMCR &= ~MCR_RTS;
1593 status = mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER,
1594 mos7840_port->shadowMCR);
1595 if (status < 0)
1596 return;
1597 }
1598 }
1599
1600 /*****************************************************************************
1601 * mos7840_unthrottle
1602 * this function is called by the tty driver when it wants to resume
1603 * the data being read from the port (called after mos7840_throttle is
1604 * called)
1605 *****************************************************************************/
1606 static void mos7840_unthrottle(struct tty_struct *tty)
1607 {
1608 struct usb_serial_port *port = tty->driver_data;
1609 int status;
1610 struct moschip_port *mos7840_port = mos7840_get_port_private(port);
1611
1612 if (mos7840_port_paranoia_check(port, __func__)) {
1613 dbg("%s", "Invalid port");
1614 return;
1615 }
1616
1617 if (mos7840_port == NULL)
1618 return;
1619
1620 if (!mos7840_port->open) {
1621 dbg("%s - port not opened", __func__);
1622 return;
1623 }
1624
1625 dbg("%s", "Entering ..........");
1626
1627 /* if we are implementing XON/XOFF, send the start character */
1628 if (I_IXOFF(tty)) {
1629 unsigned char start_char = START_CHAR(tty);
1630 status = mos7840_write(tty, port, &start_char, 1);
1631 if (status <= 0)
1632 return;
1633 }
1634
1635 /* if we are implementing RTS/CTS, toggle that line */
1636 if (tty->termios->c_cflag & CRTSCTS) {
1637 mos7840_port->shadowMCR |= MCR_RTS;
1638 status = mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER,
1639 mos7840_port->shadowMCR);
1640 if (status < 0)
1641 return;
1642 }
1643 }
1644
1645 static int mos7840_tiocmget(struct tty_struct *tty)
1646 {
1647 struct usb_serial_port *port = tty->driver_data;
1648 struct moschip_port *mos7840_port;
1649 unsigned int result;
1650 __u16 msr;
1651 __u16 mcr;
1652 int status;
1653 mos7840_port = mos7840_get_port_private(port);
1654
1655 dbg("%s - port %d", __func__, port->number);
1656
1657 if (mos7840_port == NULL)
1658 return -ENODEV;
1659
1660 status = mos7840_get_uart_reg(port, MODEM_STATUS_REGISTER, &msr);
1661 status = mos7840_get_uart_reg(port, MODEM_CONTROL_REGISTER, &mcr);
1662 result = ((mcr & MCR_DTR) ? TIOCM_DTR : 0)
1663 | ((mcr & MCR_RTS) ? TIOCM_RTS : 0)
1664 | ((mcr & MCR_LOOPBACK) ? TIOCM_LOOP : 0)
1665 | ((msr & MOS7840_MSR_CTS) ? TIOCM_CTS : 0)
1666 | ((msr & MOS7840_MSR_CD) ? TIOCM_CAR : 0)
1667 | ((msr & MOS7840_MSR_RI) ? TIOCM_RI : 0)
1668 | ((msr & MOS7840_MSR_DSR) ? TIOCM_DSR : 0);
1669
1670 dbg("%s - 0x%04X", __func__, result);
1671
1672 return result;
1673 }
1674
1675 static int mos7840_tiocmset(struct tty_struct *tty,
1676 unsigned int set, unsigned int clear)
1677 {
1678 struct usb_serial_port *port = tty->driver_data;
1679 struct moschip_port *mos7840_port;
1680 unsigned int mcr;
1681 int status;
1682
1683 dbg("%s - port %d", __func__, port->number);
1684
1685 mos7840_port = mos7840_get_port_private(port);
1686
1687 if (mos7840_port == NULL)
1688 return -ENODEV;
1689
1690 /* FIXME: What locks the port registers ? */
1691 mcr = mos7840_port->shadowMCR;
1692 if (clear & TIOCM_RTS)
1693 mcr &= ~MCR_RTS;
1694 if (clear & TIOCM_DTR)
1695 mcr &= ~MCR_DTR;
1696 if (clear & TIOCM_LOOP)
1697 mcr &= ~MCR_LOOPBACK;
1698
1699 if (set & TIOCM_RTS)
1700 mcr |= MCR_RTS;
1701 if (set & TIOCM_DTR)
1702 mcr |= MCR_DTR;
1703 if (set & TIOCM_LOOP)
1704 mcr |= MCR_LOOPBACK;
1705
1706 mos7840_port->shadowMCR = mcr;
1707
1708 status = mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER, mcr);
1709 if (status < 0) {
1710 dbg("setting MODEM_CONTROL_REGISTER Failed");
1711 return status;
1712 }
1713
1714 return 0;
1715 }
1716
1717 /*****************************************************************************
1718 * mos7840_calc_baud_rate_divisor
1719 * this function calculates the proper baud rate divisor for the specified
1720 * baud rate.
1721 *****************************************************************************/
1722 static int mos7840_calc_baud_rate_divisor(int baudRate, int *divisor,
1723 __u16 *clk_sel_val)
1724 {
1725
1726 dbg("%s - %d", __func__, baudRate);
1727
1728 if (baudRate <= 115200) {
1729 *divisor = 115200 / baudRate;
1730 *clk_sel_val = 0x0;
1731 }
1732 if ((baudRate > 115200) && (baudRate <= 230400)) {
1733 *divisor = 230400 / baudRate;
1734 *clk_sel_val = 0x10;
1735 } else if ((baudRate > 230400) && (baudRate <= 403200)) {
1736 *divisor = 403200 / baudRate;
1737 *clk_sel_val = 0x20;
1738 } else if ((baudRate > 403200) && (baudRate <= 460800)) {
1739 *divisor = 460800 / baudRate;
1740 *clk_sel_val = 0x30;
1741 } else if ((baudRate > 460800) && (baudRate <= 806400)) {
1742 *divisor = 806400 / baudRate;
1743 *clk_sel_val = 0x40;
1744 } else if ((baudRate > 806400) && (baudRate <= 921600)) {
1745 *divisor = 921600 / baudRate;
1746 *clk_sel_val = 0x50;
1747 } else if ((baudRate > 921600) && (baudRate <= 1572864)) {
1748 *divisor = 1572864 / baudRate;
1749 *clk_sel_val = 0x60;
1750 } else if ((baudRate > 1572864) && (baudRate <= 3145728)) {
1751 *divisor = 3145728 / baudRate;
1752 *clk_sel_val = 0x70;
1753 }
1754 return 0;
1755
1756 #ifdef NOTMCS7840
1757
1758 for (i = 0; i < ARRAY_SIZE(mos7840_divisor_table); i++) {
1759 if (mos7840_divisor_table[i].BaudRate == baudrate) {
1760 *divisor = mos7840_divisor_table[i].Divisor;
1761 return 0;
1762 }
1763 }
1764
1765 /* After trying for all the standard baud rates *
1766 * Try calculating the divisor for this baud rate */
1767
1768 if (baudrate > 75 && baudrate < 230400) {
1769 /* get the divisor */
1770 custom = (__u16) (230400L / baudrate);
1771
1772 /* Check for round off */
1773 round1 = (__u16) (2304000L / baudrate);
1774 round = (__u16) (round1 - (custom * 10));
1775 if (round > 4)
1776 custom++;
1777 *divisor = custom;
1778
1779 dbg(" Baud %d = %d", baudrate, custom);
1780 return 0;
1781 }
1782
1783 dbg("%s", " Baud calculation Failed...");
1784 return -1;
1785 #endif
1786 }
1787
1788 /*****************************************************************************
1789 * mos7840_send_cmd_write_baud_rate
1790 * this function sends the proper command to change the baud rate of the
1791 * specified port.
1792 *****************************************************************************/
1793
1794 static int mos7840_send_cmd_write_baud_rate(struct moschip_port *mos7840_port,
1795 int baudRate)
1796 {
1797 int divisor = 0;
1798 int status;
1799 __u16 Data;
1800 unsigned char number;
1801 __u16 clk_sel_val;
1802 struct usb_serial_port *port;
1803
1804 if (mos7840_port == NULL)
1805 return -1;
1806
1807 port = (struct usb_serial_port *)mos7840_port->port;
1808 if (mos7840_port_paranoia_check(port, __func__)) {
1809 dbg("%s", "Invalid port");
1810 return -1;
1811 }
1812
1813 if (mos7840_serial_paranoia_check(port->serial, __func__)) {
1814 dbg("%s", "Invalid Serial");
1815 return -1;
1816 }
1817
1818 dbg("%s", "Entering ..........");
1819
1820 number = mos7840_port->port->number - mos7840_port->port->serial->minor;
1821
1822 dbg("%s - port = %d, baud = %d", __func__,
1823 mos7840_port->port->number, baudRate);
1824 /* reset clk_uart_sel in spregOffset */
1825 if (baudRate > 115200) {
1826 #ifdef HW_flow_control
1827 /* NOTE: need to see the pther register to modify */
1828 /* setting h/w flow control bit to 1 */
1829 Data = 0x2b;
1830 mos7840_port->shadowMCR = Data;
1831 status = mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER,
1832 Data);
1833 if (status < 0) {
1834 dbg("Writing spreg failed in set_serial_baud");
1835 return -1;
1836 }
1837 #endif
1838
1839 } else {
1840 #ifdef HW_flow_control
1841 / *setting h/w flow control bit to 0 */
1842 Data = 0xb;
1843 mos7840_port->shadowMCR = Data;
1844 status = mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER,
1845 Data);
1846 if (status < 0) {
1847 dbg("Writing spreg failed in set_serial_baud");
1848 return -1;
1849 }
1850 #endif
1851
1852 }
1853
1854 if (1) { /* baudRate <= 115200) */
1855 clk_sel_val = 0x0;
1856 Data = 0x0;
1857 status = mos7840_calc_baud_rate_divisor(baudRate, &divisor,
1858 &clk_sel_val);
1859 status = mos7840_get_reg_sync(port, mos7840_port->SpRegOffset,
1860 &Data);
1861 if (status < 0) {
1862 dbg("reading spreg failed in set_serial_baud");
1863 return -1;
1864 }
1865 Data = (Data & 0x8f) | clk_sel_val;
1866 status = mos7840_set_reg_sync(port, mos7840_port->SpRegOffset,
1867 Data);
1868 if (status < 0) {
1869 dbg("Writing spreg failed in set_serial_baud");
1870 return -1;
1871 }
1872 /* Calculate the Divisor */
1873
1874 if (status) {
1875 dev_err(&port->dev, "%s - bad baud rate\n", __func__);
1876 return status;
1877 }
1878 /* Enable access to divisor latch */
1879 Data = mos7840_port->shadowLCR | SERIAL_LCR_DLAB;
1880 mos7840_port->shadowLCR = Data;
1881 mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data);
1882
1883 /* Write the divisor */
1884 Data = (unsigned char)(divisor & 0xff);
1885 dbg("set_serial_baud Value to write DLL is %x", Data);
1886 mos7840_set_uart_reg(port, DIVISOR_LATCH_LSB, Data);
1887
1888 Data = (unsigned char)((divisor & 0xff00) >> 8);
1889 dbg("set_serial_baud Value to write DLM is %x", Data);
1890 mos7840_set_uart_reg(port, DIVISOR_LATCH_MSB, Data);
1891
1892 /* Disable access to divisor latch */
1893 Data = mos7840_port->shadowLCR & ~SERIAL_LCR_DLAB;
1894 mos7840_port->shadowLCR = Data;
1895 mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data);
1896
1897 }
1898 return status;
1899 }
1900
1901 /*****************************************************************************
1902 * mos7840_change_port_settings
1903 * This routine is called to set the UART on the device to match
1904 * the specified new settings.
1905 *****************************************************************************/
1906
1907 static void mos7840_change_port_settings(struct tty_struct *tty,
1908 struct moschip_port *mos7840_port, struct ktermios *old_termios)
1909 {
1910 int baud;
1911 unsigned cflag;
1912 unsigned iflag;
1913 __u8 lData;
1914 __u8 lParity;
1915 __u8 lStop;
1916 int status;
1917 __u16 Data;
1918 struct usb_serial_port *port;
1919 struct usb_serial *serial;
1920
1921 if (mos7840_port == NULL)
1922 return;
1923
1924 port = (struct usb_serial_port *)mos7840_port->port;
1925
1926 if (mos7840_port_paranoia_check(port, __func__)) {
1927 dbg("%s", "Invalid port");
1928 return;
1929 }
1930
1931 if (mos7840_serial_paranoia_check(port->serial, __func__)) {
1932 dbg("%s", "Invalid Serial");
1933 return;
1934 }
1935
1936 serial = port->serial;
1937
1938 dbg("%s - port %d", __func__, mos7840_port->port->number);
1939
1940 if (!mos7840_port->open) {
1941 dbg("%s - port not opened", __func__);
1942 return;
1943 }
1944
1945 dbg("%s", "Entering ..........");
1946
1947 lData = LCR_BITS_8;
1948 lStop = LCR_STOP_1;
1949 lParity = LCR_PAR_NONE;
1950
1951 cflag = tty->termios->c_cflag;
1952 iflag = tty->termios->c_iflag;
1953
1954 /* Change the number of bits */
1955 if (cflag & CSIZE) {
1956 switch (cflag & CSIZE) {
1957 case CS5:
1958 lData = LCR_BITS_5;
1959 break;
1960
1961 case CS6:
1962 lData = LCR_BITS_6;
1963 break;
1964
1965 case CS7:
1966 lData = LCR_BITS_7;
1967 break;
1968 default:
1969 case CS8:
1970 lData = LCR_BITS_8;
1971 break;
1972 }
1973 }
1974 /* Change the Parity bit */
1975 if (cflag & PARENB) {
1976 if (cflag & PARODD) {
1977 lParity = LCR_PAR_ODD;
1978 dbg("%s - parity = odd", __func__);
1979 } else {
1980 lParity = LCR_PAR_EVEN;
1981 dbg("%s - parity = even", __func__);
1982 }
1983
1984 } else {
1985 dbg("%s - parity = none", __func__);
1986 }
1987
1988 if (cflag & CMSPAR)
1989 lParity = lParity | 0x20;
1990
1991 /* Change the Stop bit */
1992 if (cflag & CSTOPB) {
1993 lStop = LCR_STOP_2;
1994 dbg("%s - stop bits = 2", __func__);
1995 } else {
1996 lStop = LCR_STOP_1;
1997 dbg("%s - stop bits = 1", __func__);
1998 }
1999
2000 /* Update the LCR with the correct value */
2001 mos7840_port->shadowLCR &=
2002 ~(LCR_BITS_MASK | LCR_STOP_MASK | LCR_PAR_MASK);
2003 mos7840_port->shadowLCR |= (lData | lParity | lStop);
2004
2005 dbg("mos7840_change_port_settings mos7840_port->shadowLCR is %x",
2006 mos7840_port->shadowLCR);
2007 /* Disable Interrupts */
2008 Data = 0x00;
2009 mos7840_set_uart_reg(port, INTERRUPT_ENABLE_REGISTER, Data);
2010
2011 Data = 0x00;
2012 mos7840_set_uart_reg(port, FIFO_CONTROL_REGISTER, Data);
2013
2014 Data = 0xcf;
2015 mos7840_set_uart_reg(port, FIFO_CONTROL_REGISTER, Data);
2016
2017 /* Send the updated LCR value to the mos7840 */
2018 Data = mos7840_port->shadowLCR;
2019
2020 mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data);
2021
2022 Data = 0x00b;
2023 mos7840_port->shadowMCR = Data;
2024 mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER, Data);
2025 Data = 0x00b;
2026 mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER, Data);
2027
2028 /* set up the MCR register and send it to the mos7840 */
2029
2030 mos7840_port->shadowMCR = MCR_MASTER_IE;
2031 if (cflag & CBAUD)
2032 mos7840_port->shadowMCR |= (MCR_DTR | MCR_RTS);
2033
2034 if (cflag & CRTSCTS)
2035 mos7840_port->shadowMCR |= (MCR_XON_ANY);
2036 else
2037 mos7840_port->shadowMCR &= ~(MCR_XON_ANY);
2038
2039 Data = mos7840_port->shadowMCR;
2040 mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER, Data);
2041
2042 /* Determine divisor based on baud rate */
2043 baud = tty_get_baud_rate(tty);
2044
2045 if (!baud) {
2046 /* pick a default, any default... */
2047 dbg("%s", "Picked default baud...");
2048 baud = 9600;
2049 }
2050
2051 dbg("%s - baud rate = %d", __func__, baud);
2052 status = mos7840_send_cmd_write_baud_rate(mos7840_port, baud);
2053
2054 /* Enable Interrupts */
2055 Data = 0x0c;
2056 mos7840_set_uart_reg(port, INTERRUPT_ENABLE_REGISTER, Data);
2057
2058 if (mos7840_port->read_urb_busy == false) {
2059 mos7840_port->read_urb_busy = true;
2060 status = usb_submit_urb(mos7840_port->read_urb, GFP_ATOMIC);
2061 if (status) {
2062 dbg("usb_submit_urb(read bulk) failed, status = %d",
2063 status);
2064 mos7840_port->read_urb_busy = false;
2065 }
2066 }
2067 wake_up(&mos7840_port->delta_msr_wait);
2068 mos7840_port->delta_msr_cond = 1;
2069 dbg("mos7840_change_port_settings mos7840_port->shadowLCR is End %x",
2070 mos7840_port->shadowLCR);
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_busy = true;
2131 status = usb_submit_urb(mos7840_port->read_urb, GFP_ATOMIC);
2132 if (status) {
2133 dbg("usb_submit_urb(read bulk) failed, status = %d",
2134 status);
2135 mos7840_port->read_urb_busy = false;
2136 }
2137 }
2138 }
2139
2140 /*****************************************************************************
2141 * mos7840_get_lsr_info - get line status register info
2142 *
2143 * Purpose: Let user call ioctl() to get info when the UART physically
2144 * is emptied. On bus types like RS485, the transmitter must
2145 * release the bus after transmitting. This must be done when
2146 * the transmit shift register is empty, not be done when the
2147 * transmit holding register is empty. This functionality
2148 * allows an RS485 driver to be written in user space.
2149 *****************************************************************************/
2150
2151 static int mos7840_get_lsr_info(struct tty_struct *tty,
2152 unsigned int __user *value)
2153 {
2154 int count;
2155 unsigned int result = 0;
2156
2157 count = mos7840_chars_in_buffer(tty);
2158 if (count == 0) {
2159 dbg("%s -- Empty", __func__);
2160 result = TIOCSER_TEMT;
2161 }
2162
2163 if (copy_to_user(value, &result, sizeof(int)))
2164 return -EFAULT;
2165 return 0;
2166 }
2167
2168 /*****************************************************************************
2169 * mos7840_get_serial_info
2170 * function to get information about serial port
2171 *****************************************************************************/
2172
2173 static int mos7840_get_serial_info(struct moschip_port *mos7840_port,
2174 struct serial_struct __user *retinfo)
2175 {
2176 struct serial_struct tmp;
2177
2178 if (mos7840_port == NULL)
2179 return -1;
2180
2181 if (!retinfo)
2182 return -EFAULT;
2183
2184 memset(&tmp, 0, sizeof(tmp));
2185
2186 tmp.type = PORT_16550A;
2187 tmp.line = mos7840_port->port->serial->minor;
2188 tmp.port = mos7840_port->port->number;
2189 tmp.irq = 0;
2190 tmp.flags = ASYNC_SKIP_TEST | ASYNC_AUTO_IRQ;
2191 tmp.xmit_fifo_size = NUM_URBS * URB_TRANSFER_BUFFER_SIZE;
2192 tmp.baud_base = 9600;
2193 tmp.close_delay = 5 * HZ;
2194 tmp.closing_wait = 30 * HZ;
2195
2196 if (copy_to_user(retinfo, &tmp, sizeof(*retinfo)))
2197 return -EFAULT;
2198 return 0;
2199 }
2200
2201 static int mos7840_get_icount(struct tty_struct *tty,
2202 struct serial_icounter_struct *icount)
2203 {
2204 struct usb_serial_port *port = tty->driver_data;
2205 struct moschip_port *mos7840_port;
2206 struct async_icount cnow;
2207
2208 mos7840_port = mos7840_get_port_private(port);
2209 cnow = mos7840_port->icount;
2210
2211 smp_rmb();
2212 icount->cts = cnow.cts;
2213 icount->dsr = cnow.dsr;
2214 icount->rng = cnow.rng;
2215 icount->dcd = cnow.dcd;
2216 icount->rx = cnow.rx;
2217 icount->tx = cnow.tx;
2218 icount->frame = cnow.frame;
2219 icount->overrun = cnow.overrun;
2220 icount->parity = cnow.parity;
2221 icount->brk = cnow.brk;
2222 icount->buf_overrun = cnow.buf_overrun;
2223
2224 dbg("%s (%d) TIOCGICOUNT RX=%d, TX=%d", __func__,
2225 port->number, icount->rx, icount->tx);
2226 return 0;
2227 }
2228
2229 /*****************************************************************************
2230 * SerialIoctl
2231 * this function handles any ioctl calls to the driver
2232 *****************************************************************************/
2233
2234 static int mos7840_ioctl(struct tty_struct *tty,
2235 unsigned int cmd, unsigned long arg)
2236 {
2237 struct usb_serial_port *port = tty->driver_data;
2238 void __user *argp = (void __user *)arg;
2239 struct moschip_port *mos7840_port;
2240
2241 struct async_icount cnow;
2242 struct async_icount cprev;
2243
2244 if (mos7840_port_paranoia_check(port, __func__)) {
2245 dbg("%s", "Invalid port");
2246 return -1;
2247 }
2248
2249 mos7840_port = mos7840_get_port_private(port);
2250
2251 if (mos7840_port == NULL)
2252 return -1;
2253
2254 dbg("%s - port %d, cmd = 0x%x", __func__, port->number, cmd);
2255
2256 switch (cmd) {
2257 /* return number of bytes available */
2258
2259 case TIOCSERGETLSR:
2260 dbg("%s (%d) TIOCSERGETLSR", __func__, port->number);
2261 return mos7840_get_lsr_info(tty, argp);
2262
2263 case TIOCGSERIAL:
2264 dbg("%s (%d) TIOCGSERIAL", __func__, port->number);
2265 return mos7840_get_serial_info(mos7840_port, argp);
2266
2267 case TIOCSSERIAL:
2268 dbg("%s (%d) TIOCSSERIAL", __func__, port->number);
2269 break;
2270
2271 case TIOCMIWAIT:
2272 dbg("%s (%d) TIOCMIWAIT", __func__, port->number);
2273 cprev = mos7840_port->icount;
2274 while (1) {
2275 /* interruptible_sleep_on(&mos7840_port->delta_msr_wait); */
2276 mos7840_port->delta_msr_cond = 0;
2277 wait_event_interruptible(mos7840_port->delta_msr_wait,
2278 (mos7840_port->
2279 delta_msr_cond == 1));
2280
2281 /* see if a signal did it */
2282 if (signal_pending(current))
2283 return -ERESTARTSYS;
2284 cnow = mos7840_port->icount;
2285 smp_rmb();
2286 if (cnow.rng == cprev.rng && cnow.dsr == cprev.dsr &&
2287 cnow.dcd == cprev.dcd && cnow.cts == cprev.cts)
2288 return -EIO; /* no change => error */
2289 if (((arg & TIOCM_RNG) && (cnow.rng != cprev.rng)) ||
2290 ((arg & TIOCM_DSR) && (cnow.dsr != cprev.dsr)) ||
2291 ((arg & TIOCM_CD) && (cnow.dcd != cprev.dcd)) ||
2292 ((arg & TIOCM_CTS) && (cnow.cts != cprev.cts))) {
2293 return 0;
2294 }
2295 cprev = cnow;
2296 }
2297 /* NOTREACHED */
2298 break;
2299
2300 default:
2301 break;
2302 }
2303 return -ENOIOCTLCMD;
2304 }
2305
2306 static int mos7840_calc_num_ports(struct usb_serial *serial)
2307 {
2308 int mos7840_num_ports = 0;
2309
2310 dbg("numberofendpoints: cur %d, alt %d",
2311 (int)serial->interface->cur_altsetting->desc.bNumEndpoints,
2312 (int)serial->interface->altsetting->desc.bNumEndpoints);
2313 if (serial->interface->cur_altsetting->desc.bNumEndpoints == 5) {
2314 mos7840_num_ports = serial->num_ports = 2;
2315 } else if (serial->interface->cur_altsetting->desc.bNumEndpoints == 9) {
2316 serial->num_bulk_in = 4;
2317 serial->num_bulk_out = 4;
2318 mos7840_num_ports = serial->num_ports = 4;
2319 }
2320 dbg ("mos7840_num_ports = %d", mos7840_num_ports);
2321 return mos7840_num_ports;
2322 }
2323
2324 /****************************************************************************
2325 * mos7840_startup
2326 ****************************************************************************/
2327
2328 static int mos7840_startup(struct usb_serial *serial)
2329 {
2330 struct moschip_port *mos7840_port;
2331 struct usb_device *dev;
2332 int i, status;
2333
2334 __u16 Data;
2335 dbg("%s", "mos7840_startup :Entering..........");
2336
2337 if (!serial) {
2338 dbg("%s", "Invalid Handler");
2339 return -1;
2340 }
2341
2342 dev = serial->dev;
2343
2344 dbg("%s", "Entering...");
2345 dbg ("mos7840_startup: serial = %p", serial);
2346
2347 /* we set up the pointers to the endpoints in the mos7840_open *
2348 * function, as the structures aren't created yet. */
2349
2350 /* set up port private structures */
2351 for (i = 0; i < serial->num_ports; ++i) {
2352 dbg ("mos7840_startup: configuring port %d............", i);
2353 mos7840_port = kzalloc(sizeof(struct moschip_port), GFP_KERNEL);
2354 if (mos7840_port == NULL) {
2355 dev_err(&dev->dev, "%s - Out of memory\n", __func__);
2356 status = -ENOMEM;
2357 i--; /* don't follow NULL pointer cleaning up */
2358 goto error;
2359 }
2360
2361 /* Initialize all port interrupt end point to port 0 int
2362 * endpoint. Our device has only one interrupt end point
2363 * common to all port */
2364
2365 mos7840_port->port = serial->port[i];
2366 mos7840_set_port_private(serial->port[i], mos7840_port);
2367 spin_lock_init(&mos7840_port->pool_lock);
2368
2369 /* minor is not initialised until later by
2370 * usb-serial.c:get_free_serial() and cannot therefore be used
2371 * to index device instances */
2372 mos7840_port->port_num = i + 1;
2373 dbg ("serial->port[i]->number = %d", serial->port[i]->number);
2374 dbg ("serial->port[i]->serial->minor = %d", serial->port[i]->serial->minor);
2375 dbg ("mos7840_port->port_num = %d", mos7840_port->port_num);
2376 dbg ("serial->minor = %d", serial->minor);
2377
2378 if (mos7840_port->port_num == 1) {
2379 mos7840_port->SpRegOffset = 0x0;
2380 mos7840_port->ControlRegOffset = 0x1;
2381 mos7840_port->DcrRegOffset = 0x4;
2382 } else if ((mos7840_port->port_num == 2)
2383 && (serial->num_ports == 4)) {
2384 mos7840_port->SpRegOffset = 0x8;
2385 mos7840_port->ControlRegOffset = 0x9;
2386 mos7840_port->DcrRegOffset = 0x16;
2387 } else if ((mos7840_port->port_num == 2)
2388 && (serial->num_ports == 2)) {
2389 mos7840_port->SpRegOffset = 0xa;
2390 mos7840_port->ControlRegOffset = 0xb;
2391 mos7840_port->DcrRegOffset = 0x19;
2392 } else if ((mos7840_port->port_num == 3)
2393 && (serial->num_ports == 4)) {
2394 mos7840_port->SpRegOffset = 0xa;
2395 mos7840_port->ControlRegOffset = 0xb;
2396 mos7840_port->DcrRegOffset = 0x19;
2397 } else if ((mos7840_port->port_num == 4)
2398 && (serial->num_ports == 4)) {
2399 mos7840_port->SpRegOffset = 0xc;
2400 mos7840_port->ControlRegOffset = 0xd;
2401 mos7840_port->DcrRegOffset = 0x1c;
2402 }
2403 mos7840_dump_serial_port(mos7840_port);
2404 mos7840_set_port_private(serial->port[i], mos7840_port);
2405
2406 /* enable rx_disable bit in control register */
2407 status = mos7840_get_reg_sync(serial->port[i],
2408 mos7840_port->ControlRegOffset, &Data);
2409 if (status < 0) {
2410 dbg("Reading ControlReg failed status-0x%x", status);
2411 break;
2412 } else
2413 dbg("ControlReg Reading success val is %x, status%d",
2414 Data, status);
2415 Data |= 0x08; /* setting driver done bit */
2416 Data |= 0x04; /* sp1_bit to have cts change reflect in
2417 modem status reg */
2418
2419 /* Data |= 0x20; //rx_disable bit */
2420 status = mos7840_set_reg_sync(serial->port[i],
2421 mos7840_port->ControlRegOffset, Data);
2422 if (status < 0) {
2423 dbg("Writing ControlReg failed(rx_disable) status-0x%x", status);
2424 break;
2425 } else
2426 dbg("ControlReg Writing success(rx_disable) status%d",
2427 status);
2428
2429 /* Write default values in DCR (i.e 0x01 in DCR0, 0x05 in DCR2
2430 and 0x24 in DCR3 */
2431 Data = 0x01;
2432 status = mos7840_set_reg_sync(serial->port[i],
2433 (__u16) (mos7840_port->DcrRegOffset + 0), Data);
2434 if (status < 0) {
2435 dbg("Writing DCR0 failed status-0x%x", status);
2436 break;
2437 } else
2438 dbg("DCR0 Writing success status%d", status);
2439
2440 Data = 0x05;
2441 status = mos7840_set_reg_sync(serial->port[i],
2442 (__u16) (mos7840_port->DcrRegOffset + 1), Data);
2443 if (status < 0) {
2444 dbg("Writing DCR1 failed status-0x%x", status);
2445 break;
2446 } else
2447 dbg("DCR1 Writing success status%d", status);
2448
2449 Data = 0x24;
2450 status = mos7840_set_reg_sync(serial->port[i],
2451 (__u16) (mos7840_port->DcrRegOffset + 2), Data);
2452 if (status < 0) {
2453 dbg("Writing DCR2 failed status-0x%x", status);
2454 break;
2455 } else
2456 dbg("DCR2 Writing success status%d", status);
2457
2458 /* write values in clkstart0x0 and clkmulti 0x20 */
2459 Data = 0x0;
2460 status = mos7840_set_reg_sync(serial->port[i],
2461 CLK_START_VALUE_REGISTER, Data);
2462 if (status < 0) {
2463 dbg("Writing CLK_START_VALUE_REGISTER failed status-0x%x", status);
2464 break;
2465 } else
2466 dbg("CLK_START_VALUE_REGISTER Writing success status%d", status);
2467
2468 Data = 0x20;
2469 status = mos7840_set_reg_sync(serial->port[i],
2470 CLK_MULTI_REGISTER, Data);
2471 if (status < 0) {
2472 dbg("Writing CLK_MULTI_REGISTER failed status-0x%x",
2473 status);
2474 goto error;
2475 } else
2476 dbg("CLK_MULTI_REGISTER Writing success status%d",
2477 status);
2478
2479 /* write value 0x0 to scratchpad register */
2480 Data = 0x00;
2481 status = mos7840_set_uart_reg(serial->port[i],
2482 SCRATCH_PAD_REGISTER, Data);
2483 if (status < 0) {
2484 dbg("Writing SCRATCH_PAD_REGISTER failed status-0x%x",
2485 status);
2486 break;
2487 } else
2488 dbg("SCRATCH_PAD_REGISTER Writing success status%d",
2489 status);
2490
2491 /* Zero Length flag register */
2492 if ((mos7840_port->port_num != 1)
2493 && (serial->num_ports == 2)) {
2494
2495 Data = 0xff;
2496 status = mos7840_set_reg_sync(serial->port[i],
2497 (__u16) (ZLP_REG1 +
2498 ((__u16)mos7840_port->port_num)), Data);
2499 dbg("ZLIP offset %x",
2500 (__u16) (ZLP_REG1 +
2501 ((__u16) mos7840_port->port_num)));
2502 if (status < 0) {
2503 dbg("Writing ZLP_REG%d failed status-0x%x",
2504 i + 2, status);
2505 break;
2506 } else
2507 dbg("ZLP_REG%d Writing success status%d",
2508 i + 2, status);
2509 } else {
2510 Data = 0xff;
2511 status = mos7840_set_reg_sync(serial->port[i],
2512 (__u16) (ZLP_REG1 +
2513 ((__u16)mos7840_port->port_num) - 0x1), Data);
2514 dbg("ZLIP offset %x",
2515 (__u16) (ZLP_REG1 +
2516 ((__u16) mos7840_port->port_num) - 0x1));
2517 if (status < 0) {
2518 dbg("Writing ZLP_REG%d failed status-0x%x",
2519 i + 1, status);
2520 break;
2521 } else
2522 dbg("ZLP_REG%d Writing success status%d",
2523 i + 1, status);
2524
2525 }
2526 mos7840_port->control_urb = usb_alloc_urb(0, GFP_KERNEL);
2527 mos7840_port->ctrl_buf = kmalloc(16, GFP_KERNEL);
2528 mos7840_port->dr = kmalloc(sizeof(struct usb_ctrlrequest),
2529 GFP_KERNEL);
2530 if (!mos7840_port->control_urb || !mos7840_port->ctrl_buf ||
2531 !mos7840_port->dr) {
2532 status = -ENOMEM;
2533 goto error;
2534 }
2535 }
2536 dbg ("mos7840_startup: all ports configured...........");
2537
2538 /* Zero Length flag enable */
2539 Data = 0x0f;
2540 status = mos7840_set_reg_sync(serial->port[0], ZLP_REG5, Data);
2541 if (status < 0) {
2542 dbg("Writing ZLP_REG5 failed status-0x%x", status);
2543 goto error;
2544 } else
2545 dbg("ZLP_REG5 Writing success status%d", status);
2546
2547 /* setting configuration feature to one */
2548 usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0),
2549 (__u8) 0x03, 0x00, 0x01, 0x00, NULL, 0x00, 5 * HZ);
2550 return 0;
2551 error:
2552 for (/* nothing */; i >= 0; i--) {
2553 mos7840_port = mos7840_get_port_private(serial->port[i]);
2554
2555 kfree(mos7840_port->dr);
2556 kfree(mos7840_port->ctrl_buf);
2557 usb_free_urb(mos7840_port->control_urb);
2558 kfree(mos7840_port);
2559 serial->port[i] = NULL;
2560 }
2561 return status;
2562 }
2563
2564 /****************************************************************************
2565 * mos7840_disconnect
2566 * This function is called whenever the device is removed from the usb bus.
2567 ****************************************************************************/
2568
2569 static void mos7840_disconnect(struct usb_serial *serial)
2570 {
2571 int i;
2572 unsigned long flags;
2573 struct moschip_port *mos7840_port;
2574 dbg("%s", " disconnect :entering..........");
2575
2576 if (!serial) {
2577 dbg("%s", "Invalid Handler");
2578 return;
2579 }
2580
2581 /* check for the ports to be closed,close the ports and disconnect */
2582
2583 /* free private structure allocated for serial port *
2584 * stop reads and writes on all ports */
2585
2586 for (i = 0; i < serial->num_ports; ++i) {
2587 mos7840_port = mos7840_get_port_private(serial->port[i]);
2588 dbg ("mos7840_port %d = %p", i, mos7840_port);
2589 if (mos7840_port) {
2590 spin_lock_irqsave(&mos7840_port->pool_lock, flags);
2591 mos7840_port->zombie = 1;
2592 spin_unlock_irqrestore(&mos7840_port->pool_lock, flags);
2593 usb_kill_urb(mos7840_port->control_urb);
2594 }
2595 }
2596
2597 dbg("%s", "Thank u :: ");
2598
2599 }
2600
2601 /****************************************************************************
2602 * mos7840_release
2603 * This function is called when the usb_serial structure is freed.
2604 ****************************************************************************/
2605
2606 static void mos7840_release(struct usb_serial *serial)
2607 {
2608 int i;
2609 struct moschip_port *mos7840_port;
2610 dbg("%s", " release :entering..........");
2611
2612 if (!serial) {
2613 dbg("%s", "Invalid Handler");
2614 return;
2615 }
2616
2617 /* check for the ports to be closed,close the ports and disconnect */
2618
2619 /* free private structure allocated for serial port *
2620 * stop reads and writes on all ports */
2621
2622 for (i = 0; i < serial->num_ports; ++i) {
2623 mos7840_port = mos7840_get_port_private(serial->port[i]);
2624 dbg("mos7840_port %d = %p", i, mos7840_port);
2625 if (mos7840_port) {
2626 kfree(mos7840_port->ctrl_buf);
2627 kfree(mos7840_port->dr);
2628 kfree(mos7840_port);
2629 }
2630 }
2631
2632 dbg("%s", "Thank u :: ");
2633
2634 }
2635
2636 static struct usb_driver io_driver = {
2637 .name = "mos7840",
2638 .probe = usb_serial_probe,
2639 .disconnect = usb_serial_disconnect,
2640 .id_table = moschip_id_table_combined,
2641 .no_dynamic_id = 1,
2642 };
2643
2644 static struct usb_serial_driver moschip7840_4port_device = {
2645 .driver = {
2646 .owner = THIS_MODULE,
2647 .name = "mos7840",
2648 },
2649 .description = DRIVER_DESC,
2650 .usb_driver = &io_driver,
2651 .id_table = moschip_port_id_table,
2652 .num_ports = 4,
2653 .open = mos7840_open,
2654 .close = mos7840_close,
2655 .write = mos7840_write,
2656 .write_room = mos7840_write_room,
2657 .chars_in_buffer = mos7840_chars_in_buffer,
2658 .throttle = mos7840_throttle,
2659 .unthrottle = mos7840_unthrottle,
2660 .calc_num_ports = mos7840_calc_num_ports,
2661 #ifdef MCSSerialProbe
2662 .probe = mos7840_serial_probe,
2663 #endif
2664 .ioctl = mos7840_ioctl,
2665 .set_termios = mos7840_set_termios,
2666 .break_ctl = mos7840_break,
2667 .tiocmget = mos7840_tiocmget,
2668 .tiocmset = mos7840_tiocmset,
2669 .get_icount = mos7840_get_icount,
2670 .attach = mos7840_startup,
2671 .disconnect = mos7840_disconnect,
2672 .release = mos7840_release,
2673 .read_bulk_callback = mos7840_bulk_in_callback,
2674 .read_int_callback = mos7840_interrupt_callback,
2675 };
2676
2677 /****************************************************************************
2678 * moschip7840_init
2679 * This is called by the module subsystem, or on startup to initialize us
2680 ****************************************************************************/
2681 static int __init moschip7840_init(void)
2682 {
2683 int retval;
2684
2685 dbg("%s", " mos7840_init :entering..........");
2686
2687 /* Register with the usb serial */
2688 retval = usb_serial_register(&moschip7840_4port_device);
2689
2690 if (retval)
2691 goto failed_port_device_register;
2692
2693 dbg("%s", "Entering...");
2694 printk(KERN_INFO KBUILD_MODNAME ": " DRIVER_VERSION ":"
2695 DRIVER_DESC "\n");
2696
2697 /* Register with the usb */
2698 retval = usb_register(&io_driver);
2699 if (retval == 0) {
2700 dbg("%s", "Leaving...");
2701 return 0;
2702 }
2703 usb_serial_deregister(&moschip7840_4port_device);
2704 failed_port_device_register:
2705 return retval;
2706 }
2707
2708 /****************************************************************************
2709 * moschip7840_exit
2710 * Called when the driver is about to be unloaded.
2711 ****************************************************************************/
2712 static void __exit moschip7840_exit(void)
2713 {
2714
2715 dbg("%s", " mos7840_exit :entering..........");
2716
2717 usb_deregister(&io_driver);
2718
2719 usb_serial_deregister(&moschip7840_4port_device);
2720
2721 dbg("%s", "Entering...");
2722 }
2723
2724 module_init(moschip7840_init);
2725 module_exit(moschip7840_exit);
2726
2727 /* Module information */
2728 MODULE_DESCRIPTION(DRIVER_DESC);
2729 MODULE_LICENSE("GPL");
2730
2731 module_param(debug, bool, S_IRUGO | S_IWUSR);
2732 MODULE_PARM_DESC(debug, "Debug enabled or not");
Linux kernel - Deliverables
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