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Adds a nolock function to the w1 interface to avoid locking the
[linux-2.6/next.git] / drivers / usb / serial / mos7840.c
blobc72abd52498324e061bc2b3256aff77048bf70f1
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->dev = serial->dev;
796
797 mos7840_port->read_urb_busy = true;
798 retval = usb_submit_urb(mos7840_port->read_urb, GFP_ATOMIC);
799
800 if (retval) {
801 dbg("usb_submit_urb(read bulk) failed, retval = %d", retval);
802 mos7840_port->read_urb_busy = false;
803 }
804 }
805
806 /*****************************************************************************
807 * mos7840_bulk_out_data_callback
808 * this is the callback function for when we have finished sending
809 * serial data on the bulk out endpoint.
810 *****************************************************************************/
811
812 static void mos7840_bulk_out_data_callback(struct urb *urb)
813 {
814 struct moschip_port *mos7840_port;
815 struct tty_struct *tty;
816 int status = urb->status;
817 int i;
818
819 mos7840_port = urb->context;
820 spin_lock(&mos7840_port->pool_lock);
821 for (i = 0; i < NUM_URBS; i++) {
822 if (urb == mos7840_port->write_urb_pool[i]) {
823 mos7840_port->busy[i] = 0;
824 break;
825 }
826 }
827 spin_unlock(&mos7840_port->pool_lock);
828
829 if (status) {
830 dbg("nonzero write bulk status received:%d", status);
831 return;
832 }
833
834 if (mos7840_port_paranoia_check(mos7840_port->port, __func__)) {
835 dbg("%s", "Port Paranoia failed");
836 return;
837 }
838
839 dbg("%s", "Entering .........");
840
841 tty = tty_port_tty_get(&mos7840_port->port->port);
842 if (tty && mos7840_port->open)
843 tty_wakeup(tty);
844 tty_kref_put(tty);
845
846 }
847
848 /************************************************************************/
849 /* 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 */
850 /************************************************************************/
851 #ifdef MCSSerialProbe
852 static int mos7840_serial_probe(struct usb_serial *serial,
853 const struct usb_device_id *id)
854 {
855
856 /*need to implement the mode_reg reading and updating\
857 structures usb_serial_ device_type\
858 (i.e num_ports, num_bulkin,bulkout etc) */
859 /* Also we can update the changes attach */
860 return 1;
861 }
862 #endif
863
864 /*****************************************************************************
865 * mos7840_open
866 * this function is called by the tty driver when a port is opened
867 * If successful, we return 0
868 * Otherwise we return a negative error number.
869 *****************************************************************************/
870
871 static int mos7840_open(struct tty_struct *tty, struct usb_serial_port *port)
872 {
873 int response;
874 int j;
875 struct usb_serial *serial;
876 struct urb *urb;
877 __u16 Data;
878 int status;
879 struct moschip_port *mos7840_port;
880 struct moschip_port *port0;
881
882 dbg ("%s enter", __func__);
883
884 if (mos7840_port_paranoia_check(port, __func__)) {
885 dbg("%s", "Port Paranoia failed");
886 return -ENODEV;
887 }
888
889 serial = port->serial;
890
891 if (mos7840_serial_paranoia_check(serial, __func__)) {
892 dbg("%s", "Serial Paranoia failed");
893 return -ENODEV;
894 }
895
896 mos7840_port = mos7840_get_port_private(port);
897 port0 = mos7840_get_port_private(serial->port[0]);
898
899 if (mos7840_port == NULL || port0 == NULL)
900 return -ENODEV;
901
902 usb_clear_halt(serial->dev, port->write_urb->pipe);
903 usb_clear_halt(serial->dev, port->read_urb->pipe);
904 port0->open_ports++;
905
906 /* Initialising the write urb pool */
907 for (j = 0; j < NUM_URBS; ++j) {
908 urb = usb_alloc_urb(0, GFP_KERNEL);
909 mos7840_port->write_urb_pool[j] = urb;
910
911 if (urb == NULL) {
912 dev_err(&port->dev, "No more urbs???\n");
913 continue;
914 }
915
916 urb->transfer_buffer = kmalloc(URB_TRANSFER_BUFFER_SIZE,
917 GFP_KERNEL);
918 if (!urb->transfer_buffer) {
919 usb_free_urb(urb);
920 mos7840_port->write_urb_pool[j] = NULL;
921 dev_err(&port->dev,
922 "%s-out of memory for urb buffers.\n",
923 __func__);
924 continue;
925 }
926 }
927
928 /*****************************************************************************
929 * Initialize MCS7840 -- Write Init values to corresponding Registers
930 *
931 * Register Index
932 * 1 : IER
933 * 2 : FCR
934 * 3 : LCR
935 * 4 : MCR
936 *
937 * 0x08 : SP1/2 Control Reg
938 *****************************************************************************/
939
940 /* NEED to check the following Block */
941
942 Data = 0x0;
943 status = mos7840_get_reg_sync(port, mos7840_port->SpRegOffset, &Data);
944 if (status < 0) {
945 dbg("Reading Spreg failed");
946 return -1;
947 }
948 Data |= 0x80;
949 status = mos7840_set_reg_sync(port, mos7840_port->SpRegOffset, Data);
950 if (status < 0) {
951 dbg("writing Spreg failed");
952 return -1;
953 }
954
955 Data &= ~0x80;
956 status = mos7840_set_reg_sync(port, mos7840_port->SpRegOffset, Data);
957 if (status < 0) {
958 dbg("writing Spreg failed");
959 return -1;
960 }
961 /* End of block to be checked */
962
963 Data = 0x0;
964 status = mos7840_get_reg_sync(port, mos7840_port->ControlRegOffset,
965 &Data);
966 if (status < 0) {
967 dbg("Reading Controlreg failed");
968 return -1;
969 }
970 Data |= 0x08; /* Driver done bit */
971 Data |= 0x20; /* rx_disable */
972 status = mos7840_set_reg_sync(port,
973 mos7840_port->ControlRegOffset, Data);
974 if (status < 0) {
975 dbg("writing Controlreg failed");
976 return -1;
977 }
978 /* do register settings here */
979 /* Set all regs to the device default values. */
980 /***********************************
981 * First Disable all interrupts.
982 ***********************************/
983 Data = 0x00;
984 status = mos7840_set_uart_reg(port, INTERRUPT_ENABLE_REGISTER, Data);
985 if (status < 0) {
986 dbg("disabling interrupts failed");
987 return -1;
988 }
989 /* Set FIFO_CONTROL_REGISTER to the default value */
990 Data = 0x00;
991 status = mos7840_set_uart_reg(port, FIFO_CONTROL_REGISTER, Data);
992 if (status < 0) {
993 dbg("Writing FIFO_CONTROL_REGISTER failed");
994 return -1;
995 }
996
997 Data = 0xcf;
998 status = mos7840_set_uart_reg(port, FIFO_CONTROL_REGISTER, Data);
999 if (status < 0) {
1000 dbg("Writing FIFO_CONTROL_REGISTER failed");
1001 return -1;
1002 }
1003
1004 Data = 0x03;
1005 status = mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data);
1006 mos7840_port->shadowLCR = Data;
1007
1008 Data = 0x0b;
1009 status = mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER, Data);
1010 mos7840_port->shadowMCR = Data;
1011
1012 Data = 0x00;
1013 status = mos7840_get_uart_reg(port, LINE_CONTROL_REGISTER, &Data);
1014 mos7840_port->shadowLCR = Data;
1015
1016 Data |= SERIAL_LCR_DLAB; /* data latch enable in LCR 0x80 */
1017 status = mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data);
1018
1019 Data = 0x0c;
1020 status = mos7840_set_uart_reg(port, DIVISOR_LATCH_LSB, Data);
1021
1022 Data = 0x0;
1023 status = mos7840_set_uart_reg(port, DIVISOR_LATCH_MSB, Data);
1024
1025 Data = 0x00;
1026 status = mos7840_get_uart_reg(port, LINE_CONTROL_REGISTER, &Data);
1027
1028 Data = Data & ~SERIAL_LCR_DLAB;
1029 status = mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data);
1030 mos7840_port->shadowLCR = Data;
1031
1032 /* clearing Bulkin and Bulkout Fifo */
1033 Data = 0x0;
1034 status = mos7840_get_reg_sync(port, mos7840_port->SpRegOffset, &Data);
1035
1036 Data = Data | 0x0c;
1037 status = mos7840_set_reg_sync(port, mos7840_port->SpRegOffset, Data);
1038
1039 Data = Data & ~0x0c;
1040 status = mos7840_set_reg_sync(port, mos7840_port->SpRegOffset, Data);
1041 /* Finally enable all interrupts */
1042 Data = 0x0c;
1043 status = mos7840_set_uart_reg(port, INTERRUPT_ENABLE_REGISTER, Data);
1044
1045 /* clearing rx_disable */
1046 Data = 0x0;
1047 status = mos7840_get_reg_sync(port, mos7840_port->ControlRegOffset,
1048 &Data);
1049 Data = Data & ~0x20;
1050 status = mos7840_set_reg_sync(port, mos7840_port->ControlRegOffset,
1051 Data);
1052
1053 /* rx_negate */
1054 Data = 0x0;
1055 status = mos7840_get_reg_sync(port, mos7840_port->ControlRegOffset,
1056 &Data);
1057 Data = Data | 0x10;
1058 status = mos7840_set_reg_sync(port, mos7840_port->ControlRegOffset,
1059 Data);
1060
1061 /* Check to see if we've set up our endpoint info yet *
1062 * (can't set it up in mos7840_startup as the structures *
1063 * were not set up at that time.) */
1064 if (port0->open_ports == 1) {
1065 if (serial->port[0]->interrupt_in_buffer == NULL) {
1066 /* set up interrupt urb */
1067 usb_fill_int_urb(serial->port[0]->interrupt_in_urb,
1068 serial->dev,
1069 usb_rcvintpipe(serial->dev,
1070 serial->port[0]->interrupt_in_endpointAddress),
1071 serial->port[0]->interrupt_in_buffer,
1072 serial->port[0]->interrupt_in_urb->
1073 transfer_buffer_length,
1074 mos7840_interrupt_callback,
1075 serial,
1076 serial->port[0]->interrupt_in_urb->interval);
1077
1078 /* start interrupt read for mos7840 *
1079 * will continue as long as mos7840 is connected */
1080
1081 response =
1082 usb_submit_urb(serial->port[0]->interrupt_in_urb,
1083 GFP_KERNEL);
1084 if (response) {
1085 dev_err(&port->dev, "%s - Error %d submitting "
1086 "interrupt urb\n", __func__, response);
1087 }
1088
1089 }
1090
1091 }
1092
1093 /* see if we've set up our endpoint info yet *
1094 * (can't set it up in mos7840_startup as the *
1095 * structures were not set up at that time.) */
1096
1097 dbg("port number is %d", port->number);
1098 dbg("serial number is %d", port->serial->minor);
1099 dbg("Bulkin endpoint is %d", port->bulk_in_endpointAddress);
1100 dbg("BulkOut endpoint is %d", port->bulk_out_endpointAddress);
1101 dbg("Interrupt endpoint is %d", port->interrupt_in_endpointAddress);
1102 dbg("port's number in the device is %d", mos7840_port->port_num);
1103 mos7840_port->read_urb = port->read_urb;
1104
1105 /* set up our bulk in urb */
1106
1107 usb_fill_bulk_urb(mos7840_port->read_urb,
1108 serial->dev,
1109 usb_rcvbulkpipe(serial->dev,
1110 port->bulk_in_endpointAddress),
1111 port->bulk_in_buffer,
1112 mos7840_port->read_urb->transfer_buffer_length,
1113 mos7840_bulk_in_callback, mos7840_port);
1114
1115 dbg("mos7840_open: bulkin endpoint is %d",
1116 port->bulk_in_endpointAddress);
1117 mos7840_port->read_urb_busy = true;
1118 response = usb_submit_urb(mos7840_port->read_urb, GFP_KERNEL);
1119 if (response) {
1120 dev_err(&port->dev, "%s - Error %d submitting control urb\n",
1121 __func__, response);
1122 mos7840_port->read_urb_busy = false;
1123 }
1124
1125 /* initialize our wait queues */
1126 init_waitqueue_head(&mos7840_port->wait_chase);
1127 init_waitqueue_head(&mos7840_port->delta_msr_wait);
1128
1129 /* initialize our icount structure */
1130 memset(&(mos7840_port->icount), 0x00, sizeof(mos7840_port->icount));
1131
1132 /* initialize our port settings */
1133 /* Must set to enable ints! */
1134 mos7840_port->shadowMCR = MCR_MASTER_IE;
1135 /* send a open port command */
1136 mos7840_port->open = 1;
1137 /* mos7840_change_port_settings(mos7840_port,old_termios); */
1138 mos7840_port->icount.tx = 0;
1139 mos7840_port->icount.rx = 0;
1140
1141 dbg("usb_serial serial:%p mos7840_port:%p\n usb_serial_port port:%p",
1142 serial, mos7840_port, port);
1143
1144 dbg ("%s leave", __func__);
1145
1146 return 0;
1147
1148 }
1149
1150 /*****************************************************************************
1151 * mos7840_chars_in_buffer
1152 * this function is called by the tty driver when it wants to know how many
1153 * bytes of data we currently have outstanding in the port (data that has
1154 * been written, but hasn't made it out the port yet)
1155 * If successful, we return the number of bytes left to be written in the
1156 * system,
1157 * Otherwise we return zero.
1158 *****************************************************************************/
1159
1160 static int mos7840_chars_in_buffer(struct tty_struct *tty)
1161 {
1162 struct usb_serial_port *port = tty->driver_data;
1163 int i;
1164 int chars = 0;
1165 unsigned long flags;
1166 struct moschip_port *mos7840_port;
1167
1168 dbg("%s", " mos7840_chars_in_buffer:entering ...........");
1169
1170 if (mos7840_port_paranoia_check(port, __func__)) {
1171 dbg("%s", "Invalid port");
1172 return 0;
1173 }
1174
1175 mos7840_port = mos7840_get_port_private(port);
1176 if (mos7840_port == NULL) {
1177 dbg("%s", "mos7840_break:leaving ...........");
1178 return 0;
1179 }
1180
1181 spin_lock_irqsave(&mos7840_port->pool_lock, flags);
1182 for (i = 0; i < NUM_URBS; ++i)
1183 if (mos7840_port->busy[i])
1184 chars += URB_TRANSFER_BUFFER_SIZE;
1185 spin_unlock_irqrestore(&mos7840_port->pool_lock, flags);
1186 dbg("%s - returns %d", __func__, chars);
1187 return chars;
1188
1189 }
1190
1191 /*****************************************************************************
1192 * mos7840_close
1193 * this function is called by the tty driver when a port is closed
1194 *****************************************************************************/
1195
1196 static void mos7840_close(struct usb_serial_port *port)
1197 {
1198 struct usb_serial *serial;
1199 struct moschip_port *mos7840_port;
1200 struct moschip_port *port0;
1201 int j;
1202 __u16 Data;
1203
1204 dbg("%s", "mos7840_close:entering...");
1205
1206 if (mos7840_port_paranoia_check(port, __func__)) {
1207 dbg("%s", "Port Paranoia failed");
1208 return;
1209 }
1210
1211 serial = mos7840_get_usb_serial(port, __func__);
1212 if (!serial) {
1213 dbg("%s", "Serial Paranoia failed");
1214 return;
1215 }
1216
1217 mos7840_port = mos7840_get_port_private(port);
1218 port0 = mos7840_get_port_private(serial->port[0]);
1219
1220 if (mos7840_port == NULL || port0 == NULL)
1221 return;
1222
1223 for (j = 0; j < NUM_URBS; ++j)
1224 usb_kill_urb(mos7840_port->write_urb_pool[j]);
1225
1226 /* Freeing Write URBs */
1227 for (j = 0; j < NUM_URBS; ++j) {
1228 if (mos7840_port->write_urb_pool[j]) {
1229 if (mos7840_port->write_urb_pool[j]->transfer_buffer)
1230 kfree(mos7840_port->write_urb_pool[j]->
1231 transfer_buffer);
1232
1233 usb_free_urb(mos7840_port->write_urb_pool[j]);
1234 }
1235 }
1236
1237 /* While closing port, shutdown all bulk read, write *
1238 * and interrupt read if they exists */
1239 if (serial->dev) {
1240 if (mos7840_port->write_urb) {
1241 dbg("%s", "Shutdown bulk write");
1242 usb_kill_urb(mos7840_port->write_urb);
1243 }
1244 if (mos7840_port->read_urb) {
1245 dbg("%s", "Shutdown bulk read");
1246 usb_kill_urb(mos7840_port->read_urb);
1247 mos7840_port->read_urb_busy = false;
1248 }
1249 if ((&mos7840_port->control_urb)) {
1250 dbg("%s", "Shutdown control read");
1251 /*/ usb_kill_urb (mos7840_port->control_urb); */
1252 }
1253 }
1254 /* if(mos7840_port->ctrl_buf != NULL) */
1255 /* kfree(mos7840_port->ctrl_buf); */
1256 port0->open_ports--;
1257 dbg("mos7840_num_open_ports in close%d:in port%d",
1258 port0->open_ports, port->number);
1259 if (port0->open_ports == 0) {
1260 if (serial->port[0]->interrupt_in_urb) {
1261 dbg("%s", "Shutdown interrupt_in_urb");
1262 usb_kill_urb(serial->port[0]->interrupt_in_urb);
1263 }
1264 }
1265
1266 if (mos7840_port->write_urb) {
1267 /* if this urb had a transfer buffer already (old tx) free it */
1268 if (mos7840_port->write_urb->transfer_buffer != NULL)
1269 kfree(mos7840_port->write_urb->transfer_buffer);
1270 usb_free_urb(mos7840_port->write_urb);
1271 }
1272
1273 Data = 0x0;
1274 mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER, Data);
1275
1276 Data = 0x00;
1277 mos7840_set_uart_reg(port, INTERRUPT_ENABLE_REGISTER, Data);
1278
1279 mos7840_port->open = 0;
1280
1281 dbg("%s", "Leaving ............");
1282 }
1283
1284 /************************************************************************
1285 *
1286 * mos7840_block_until_chase_response
1287 *
1288 * This function will block the close until one of the following:
1289 * 1. Response to our Chase comes from mos7840
1290 * 2. A timeout of 10 seconds without activity has expired
1291 * (1K of mos7840 data @ 2400 baud ==> 4 sec to empty)
1292 *
1293 ************************************************************************/
1294
1295 static void mos7840_block_until_chase_response(struct tty_struct *tty,
1296 struct moschip_port *mos7840_port)
1297 {
1298 int timeout = 1 * HZ;
1299 int wait = 10;
1300 int count;
1301
1302 while (1) {
1303 count = mos7840_chars_in_buffer(tty);
1304
1305 /* Check for Buffer status */
1306 if (count <= 0)
1307 return;
1308
1309 /* Block the thread for a while */
1310 interruptible_sleep_on_timeout(&mos7840_port->wait_chase,
1311 timeout);
1312 /* No activity.. count down section */
1313 wait--;
1314 if (wait == 0) {
1315 dbg("%s - TIMEOUT", __func__);
1316 return;
1317 } else {
1318 /* Reset timeout value back to seconds */
1319 wait = 10;
1320 }
1321 }
1322
1323 }
1324
1325 /*****************************************************************************
1326 * mos7840_break
1327 * this function sends a break to the port
1328 *****************************************************************************/
1329 static void mos7840_break(struct tty_struct *tty, int break_state)
1330 {
1331 struct usb_serial_port *port = tty->driver_data;
1332 unsigned char data;
1333 struct usb_serial *serial;
1334 struct moschip_port *mos7840_port;
1335
1336 dbg("%s", "Entering ...........");
1337 dbg("mos7840_break: Start");
1338
1339 if (mos7840_port_paranoia_check(port, __func__)) {
1340 dbg("%s", "Port Paranoia failed");
1341 return;
1342 }
1343
1344 serial = mos7840_get_usb_serial(port, __func__);
1345 if (!serial) {
1346 dbg("%s", "Serial Paranoia failed");
1347 return;
1348 }
1349
1350 mos7840_port = mos7840_get_port_private(port);
1351
1352 if (mos7840_port == NULL)
1353 return;
1354
1355 if (serial->dev)
1356 /* flush and block until tx is empty */
1357 mos7840_block_until_chase_response(tty, mos7840_port);
1358
1359 if (break_state == -1)
1360 data = mos7840_port->shadowLCR | LCR_SET_BREAK;
1361 else
1362 data = mos7840_port->shadowLCR & ~LCR_SET_BREAK;
1363
1364 /* FIXME: no locking on shadowLCR anywhere in driver */
1365 mos7840_port->shadowLCR = data;
1366 dbg("mcs7840_break mos7840_port->shadowLCR is %x",
1367 mos7840_port->shadowLCR);
1368 mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER,
1369 mos7840_port->shadowLCR);
1370 }
1371
1372 /*****************************************************************************
1373 * mos7840_write_room
1374 * this function is called by the tty driver when it wants to know how many
1375 * bytes of data we can accept for a specific port.
1376 * If successful, we return the amount of room that we have for this port
1377 * Otherwise we return a negative error number.
1378 *****************************************************************************/
1379
1380 static int mos7840_write_room(struct tty_struct *tty)
1381 {
1382 struct usb_serial_port *port = tty->driver_data;
1383 int i;
1384 int room = 0;
1385 unsigned long flags;
1386 struct moschip_port *mos7840_port;
1387
1388 dbg("%s", " mos7840_write_room:entering ...........");
1389
1390 if (mos7840_port_paranoia_check(port, __func__)) {
1391 dbg("%s", "Invalid port");
1392 dbg("%s", " mos7840_write_room:leaving ...........");
1393 return -1;
1394 }
1395
1396 mos7840_port = mos7840_get_port_private(port);
1397 if (mos7840_port == NULL) {
1398 dbg("%s", "mos7840_break:leaving ...........");
1399 return -1;
1400 }
1401
1402 spin_lock_irqsave(&mos7840_port->pool_lock, flags);
1403 for (i = 0; i < NUM_URBS; ++i) {
1404 if (!mos7840_port->busy[i])
1405 room += URB_TRANSFER_BUFFER_SIZE;
1406 }
1407 spin_unlock_irqrestore(&mos7840_port->pool_lock, flags);
1408
1409 room = (room == 0) ? 0 : room - URB_TRANSFER_BUFFER_SIZE + 1;
1410 dbg("%s - returns %d", __func__, room);
1411 return room;
1412
1413 }
1414
1415 /*****************************************************************************
1416 * mos7840_write
1417 * this function is called by the tty driver when data should be written to
1418 * the port.
1419 * If successful, we return the number of bytes written, otherwise we
1420 * return a negative error number.
1421 *****************************************************************************/
1422
1423 static int mos7840_write(struct tty_struct *tty, struct usb_serial_port *port,
1424 const unsigned char *data, int count)
1425 {
1426 int status;
1427 int i;
1428 int bytes_sent = 0;
1429 int transfer_size;
1430 unsigned long flags;
1431
1432 struct moschip_port *mos7840_port;
1433 struct usb_serial *serial;
1434 struct urb *urb;
1435 /* __u16 Data; */
1436 const unsigned char *current_position = data;
1437 unsigned char *data1;
1438 dbg("%s", "entering ...........");
1439 /* dbg("mos7840_write: mos7840_port->shadowLCR is %x",
1440 mos7840_port->shadowLCR); */
1441
1442 #ifdef NOTMOS7840
1443 Data = 0x00;
1444 status = mos7840_get_uart_reg(port, LINE_CONTROL_REGISTER, &Data);
1445 mos7840_port->shadowLCR = Data;
1446 dbg("mos7840_write: LINE_CONTROL_REGISTER is %x", Data);
1447 dbg("mos7840_write: mos7840_port->shadowLCR is %x",
1448 mos7840_port->shadowLCR);
1449
1450 /* Data = 0x03; */
1451 /* status = mos7840_set_uart_reg(port,LINE_CONTROL_REGISTER,Data); */
1452 /* mos7840_port->shadowLCR=Data;//Need to add later */
1453
1454 Data |= SERIAL_LCR_DLAB; /* data latch enable in LCR 0x80 */
1455 status = mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data);
1456
1457 /* Data = 0x0c; */
1458 /* status = mos7840_set_uart_reg(port,DIVISOR_LATCH_LSB,Data); */
1459 Data = 0x00;
1460 status = mos7840_get_uart_reg(port, DIVISOR_LATCH_LSB, &Data);
1461 dbg("mos7840_write:DLL value is %x", Data);
1462
1463 Data = 0x0;
1464 status = mos7840_get_uart_reg(port, DIVISOR_LATCH_MSB, &Data);
1465 dbg("mos7840_write:DLM value is %x", Data);
1466
1467 Data = Data & ~SERIAL_LCR_DLAB;
1468 dbg("mos7840_write: mos7840_port->shadowLCR is %x",
1469 mos7840_port->shadowLCR);
1470 status = mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data);
1471 #endif
1472
1473 if (mos7840_port_paranoia_check(port, __func__)) {
1474 dbg("%s", "Port Paranoia failed");
1475 return -1;
1476 }
1477
1478 serial = port->serial;
1479 if (mos7840_serial_paranoia_check(serial, __func__)) {
1480 dbg("%s", "Serial Paranoia failed");
1481 return -1;
1482 }
1483
1484 mos7840_port = mos7840_get_port_private(port);
1485 if (mos7840_port == NULL) {
1486 dbg("%s", "mos7840_port is NULL");
1487 return -1;
1488 }
1489
1490 /* try to find a free urb in the list */
1491 urb = NULL;
1492
1493 spin_lock_irqsave(&mos7840_port->pool_lock, flags);
1494 for (i = 0; i < NUM_URBS; ++i) {
1495 if (!mos7840_port->busy[i]) {
1496 mos7840_port->busy[i] = 1;
1497 urb = mos7840_port->write_urb_pool[i];
1498 dbg("URB:%d", i);
1499 break;
1500 }
1501 }
1502 spin_unlock_irqrestore(&mos7840_port->pool_lock, flags);
1503
1504 if (urb == NULL) {
1505 dbg("%s - no more free urbs", __func__);
1506 goto exit;
1507 }
1508
1509 if (urb->transfer_buffer == NULL) {
1510 urb->transfer_buffer =
1511 kmalloc(URB_TRANSFER_BUFFER_SIZE, GFP_KERNEL);
1512
1513 if (urb->transfer_buffer == NULL) {
1514 dev_err(&port->dev, "%s no more kernel memory...\n",
1515 __func__);
1516 goto exit;
1517 }
1518 }
1519 transfer_size = min(count, URB_TRANSFER_BUFFER_SIZE);
1520
1521 memcpy(urb->transfer_buffer, current_position, transfer_size);
1522
1523 /* fill urb with data and submit */
1524 usb_fill_bulk_urb(urb,
1525 serial->dev,
1526 usb_sndbulkpipe(serial->dev,
1527 port->bulk_out_endpointAddress),
1528 urb->transfer_buffer,
1529 transfer_size,
1530 mos7840_bulk_out_data_callback, mos7840_port);
1531
1532 data1 = urb->transfer_buffer;
1533 dbg("bulkout endpoint is %d", port->bulk_out_endpointAddress);
1534
1535 /* send it down the pipe */
1536 status = usb_submit_urb(urb, GFP_ATOMIC);
1537
1538 if (status) {
1539 mos7840_port->busy[i] = 0;
1540 dev_err(&port->dev, "%s - usb_submit_urb(write bulk) failed "
1541 "with status = %d\n", __func__, status);
1542 bytes_sent = status;
1543 goto exit;
1544 }
1545 bytes_sent = transfer_size;
1546 mos7840_port->icount.tx += transfer_size;
1547 smp_wmb();
1548 dbg("mos7840_port->icount.tx is %d:", mos7840_port->icount.tx);
1549 exit:
1550 return bytes_sent;
1551
1552 }
1553
1554 /*****************************************************************************
1555 * mos7840_throttle
1556 * this function is called by the tty driver when it wants to stop the data
1557 * being read from the port.
1558 *****************************************************************************/
1559
1560 static void mos7840_throttle(struct tty_struct *tty)
1561 {
1562 struct usb_serial_port *port = tty->driver_data;
1563 struct moschip_port *mos7840_port;
1564 int status;
1565
1566 if (mos7840_port_paranoia_check(port, __func__)) {
1567 dbg("%s", "Invalid port");
1568 return;
1569 }
1570
1571 dbg("- port %d", port->number);
1572
1573 mos7840_port = mos7840_get_port_private(port);
1574
1575 if (mos7840_port == NULL)
1576 return;
1577
1578 if (!mos7840_port->open) {
1579 dbg("%s", "port not opened");
1580 return;
1581 }
1582
1583 dbg("%s", "Entering ..........");
1584
1585 /* if we are implementing XON/XOFF, send the stop character */
1586 if (I_IXOFF(tty)) {
1587 unsigned char stop_char = STOP_CHAR(tty);
1588 status = mos7840_write(tty, port, &stop_char, 1);
1589 if (status <= 0)
1590 return;
1591 }
1592 /* if we are implementing RTS/CTS, toggle that line */
1593 if (tty->termios->c_cflag & CRTSCTS) {
1594 mos7840_port->shadowMCR &= ~MCR_RTS;
1595 status = mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER,
1596 mos7840_port->shadowMCR);
1597 if (status < 0)
1598 return;
1599 }
1600 }
1601
1602 /*****************************************************************************
1603 * mos7840_unthrottle
1604 * this function is called by the tty driver when it wants to resume
1605 * the data being read from the port (called after mos7840_throttle is
1606 * called)
1607 *****************************************************************************/
1608 static void mos7840_unthrottle(struct tty_struct *tty)
1609 {
1610 struct usb_serial_port *port = tty->driver_data;
1611 int status;
1612 struct moschip_port *mos7840_port = mos7840_get_port_private(port);
1613
1614 if (mos7840_port_paranoia_check(port, __func__)) {
1615 dbg("%s", "Invalid port");
1616 return;
1617 }
1618
1619 if (mos7840_port == NULL)
1620 return;
1621
1622 if (!mos7840_port->open) {
1623 dbg("%s - port not opened", __func__);
1624 return;
1625 }
1626
1627 dbg("%s", "Entering ..........");
1628
1629 /* if we are implementing XON/XOFF, send the start character */
1630 if (I_IXOFF(tty)) {
1631 unsigned char start_char = START_CHAR(tty);
1632 status = mos7840_write(tty, port, &start_char, 1);
1633 if (status <= 0)
1634 return;
1635 }
1636
1637 /* if we are implementing RTS/CTS, toggle that line */
1638 if (tty->termios->c_cflag & CRTSCTS) {
1639 mos7840_port->shadowMCR |= MCR_RTS;
1640 status = mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER,
1641 mos7840_port->shadowMCR);
1642 if (status < 0)
1643 return;
1644 }
1645 }
1646
1647 static int mos7840_tiocmget(struct tty_struct *tty)
1648 {
1649 struct usb_serial_port *port = tty->driver_data;
1650 struct moschip_port *mos7840_port;
1651 unsigned int result;
1652 __u16 msr;
1653 __u16 mcr;
1654 int status;
1655 mos7840_port = mos7840_get_port_private(port);
1656
1657 dbg("%s - port %d", __func__, port->number);
1658
1659 if (mos7840_port == NULL)
1660 return -ENODEV;
1661
1662 status = mos7840_get_uart_reg(port, MODEM_STATUS_REGISTER, &msr);
1663 status = mos7840_get_uart_reg(port, MODEM_CONTROL_REGISTER, &mcr);
1664 result = ((mcr & MCR_DTR) ? TIOCM_DTR : 0)
1665 | ((mcr & MCR_RTS) ? TIOCM_RTS : 0)
1666 | ((mcr & MCR_LOOPBACK) ? TIOCM_LOOP : 0)
1667 | ((msr & MOS7840_MSR_CTS) ? TIOCM_CTS : 0)
1668 | ((msr & MOS7840_MSR_CD) ? TIOCM_CAR : 0)
1669 | ((msr & MOS7840_MSR_RI) ? TIOCM_RI : 0)
1670 | ((msr & MOS7840_MSR_DSR) ? TIOCM_DSR : 0);
1671
1672 dbg("%s - 0x%04X", __func__, result);
1673
1674 return result;
1675 }
1676
1677 static int mos7840_tiocmset(struct tty_struct *tty,
1678 unsigned int set, unsigned int clear)
1679 {
1680 struct usb_serial_port *port = tty->driver_data;
1681 struct moschip_port *mos7840_port;
1682 unsigned int mcr;
1683 int status;
1684
1685 dbg("%s - port %d", __func__, port->number);
1686
1687 mos7840_port = mos7840_get_port_private(port);
1688
1689 if (mos7840_port == NULL)
1690 return -ENODEV;
1691
1692 /* FIXME: What locks the port registers ? */
1693 mcr = mos7840_port->shadowMCR;
1694 if (clear & TIOCM_RTS)
1695 mcr &= ~MCR_RTS;
1696 if (clear & TIOCM_DTR)
1697 mcr &= ~MCR_DTR;
1698 if (clear & TIOCM_LOOP)
1699 mcr &= ~MCR_LOOPBACK;
1700
1701 if (set & TIOCM_RTS)
1702 mcr |= MCR_RTS;
1703 if (set & TIOCM_DTR)
1704 mcr |= MCR_DTR;
1705 if (set & TIOCM_LOOP)
1706 mcr |= MCR_LOOPBACK;
1707
1708 mos7840_port->shadowMCR = mcr;
1709
1710 status = mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER, mcr);
1711 if (status < 0) {
1712 dbg("setting MODEM_CONTROL_REGISTER Failed");
1713 return status;
1714 }
1715
1716 return 0;
1717 }
1718
1719 /*****************************************************************************
1720 * mos7840_calc_baud_rate_divisor
1721 * this function calculates the proper baud rate divisor for the specified
1722 * baud rate.
1723 *****************************************************************************/
1724 static int mos7840_calc_baud_rate_divisor(int baudRate, int *divisor,
1725 __u16 *clk_sel_val)
1726 {
1727
1728 dbg("%s - %d", __func__, baudRate);
1729
1730 if (baudRate <= 115200) {
1731 *divisor = 115200 / baudRate;
1732 *clk_sel_val = 0x0;
1733 }
1734 if ((baudRate > 115200) && (baudRate <= 230400)) {
1735 *divisor = 230400 / baudRate;
1736 *clk_sel_val = 0x10;
1737 } else if ((baudRate > 230400) && (baudRate <= 403200)) {
1738 *divisor = 403200 / baudRate;
1739 *clk_sel_val = 0x20;
1740 } else if ((baudRate > 403200) && (baudRate <= 460800)) {
1741 *divisor = 460800 / baudRate;
1742 *clk_sel_val = 0x30;
1743 } else if ((baudRate > 460800) && (baudRate <= 806400)) {
1744 *divisor = 806400 / baudRate;
1745 *clk_sel_val = 0x40;
1746 } else if ((baudRate > 806400) && (baudRate <= 921600)) {
1747 *divisor = 921600 / baudRate;
1748 *clk_sel_val = 0x50;
1749 } else if ((baudRate > 921600) && (baudRate <= 1572864)) {
1750 *divisor = 1572864 / baudRate;
1751 *clk_sel_val = 0x60;
1752 } else if ((baudRate > 1572864) && (baudRate <= 3145728)) {
1753 *divisor = 3145728 / baudRate;
1754 *clk_sel_val = 0x70;
1755 }
1756 return 0;
1757
1758 #ifdef NOTMCS7840
1759
1760 for (i = 0; i < ARRAY_SIZE(mos7840_divisor_table); i++) {
1761 if (mos7840_divisor_table[i].BaudRate == baudrate) {
1762 *divisor = mos7840_divisor_table[i].Divisor;
1763 return 0;
1764 }
1765 }
1766
1767 /* After trying for all the standard baud rates *
1768 * Try calculating the divisor for this baud rate */
1769
1770 if (baudrate > 75 && baudrate < 230400) {
1771 /* get the divisor */
1772 custom = (__u16) (230400L / baudrate);
1773
1774 /* Check for round off */
1775 round1 = (__u16) (2304000L / baudrate);
1776 round = (__u16) (round1 - (custom * 10));
1777 if (round > 4)
1778 custom++;
1779 *divisor = custom;
1780
1781 dbg(" Baud %d = %d", baudrate, custom);
1782 return 0;
1783 }
1784
1785 dbg("%s", " Baud calculation Failed...");
1786 return -1;
1787 #endif
1788 }
1789
1790 /*****************************************************************************
1791 * mos7840_send_cmd_write_baud_rate
1792 * this function sends the proper command to change the baud rate of the
1793 * specified port.
1794 *****************************************************************************/
1795
1796 static int mos7840_send_cmd_write_baud_rate(struct moschip_port *mos7840_port,
1797 int baudRate)
1798 {
1799 int divisor = 0;
1800 int status;
1801 __u16 Data;
1802 unsigned char number;
1803 __u16 clk_sel_val;
1804 struct usb_serial_port *port;
1805
1806 if (mos7840_port == NULL)
1807 return -1;
1808
1809 port = (struct usb_serial_port *)mos7840_port->port;
1810 if (mos7840_port_paranoia_check(port, __func__)) {
1811 dbg("%s", "Invalid port");
1812 return -1;
1813 }
1814
1815 if (mos7840_serial_paranoia_check(port->serial, __func__)) {
1816 dbg("%s", "Invalid Serial");
1817 return -1;
1818 }
1819
1820 dbg("%s", "Entering ..........");
1821
1822 number = mos7840_port->port->number - mos7840_port->port->serial->minor;
1823
1824 dbg("%s - port = %d, baud = %d", __func__,
1825 mos7840_port->port->number, baudRate);
1826 /* reset clk_uart_sel in spregOffset */
1827 if (baudRate > 115200) {
1828 #ifdef HW_flow_control
1829 /* NOTE: need to see the pther register to modify */
1830 /* setting h/w flow control bit to 1 */
1831 Data = 0x2b;
1832 mos7840_port->shadowMCR = Data;
1833 status = mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER,
1834 Data);
1835 if (status < 0) {
1836 dbg("Writing spreg failed in set_serial_baud");
1837 return -1;
1838 }
1839 #endif
1840
1841 } else {
1842 #ifdef HW_flow_control
1843 / *setting h/w flow control bit to 0 */
1844 Data = 0xb;
1845 mos7840_port->shadowMCR = Data;
1846 status = mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER,
1847 Data);
1848 if (status < 0) {
1849 dbg("Writing spreg failed in set_serial_baud");
1850 return -1;
1851 }
1852 #endif
1853
1854 }
1855
1856 if (1) { /* baudRate <= 115200) */
1857 clk_sel_val = 0x0;
1858 Data = 0x0;
1859 status = mos7840_calc_baud_rate_divisor(baudRate, &divisor,
1860 &clk_sel_val);
1861 status = mos7840_get_reg_sync(port, mos7840_port->SpRegOffset,
1862 &Data);
1863 if (status < 0) {
1864 dbg("reading spreg failed in set_serial_baud");
1865 return -1;
1866 }
1867 Data = (Data & 0x8f) | clk_sel_val;
1868 status = mos7840_set_reg_sync(port, mos7840_port->SpRegOffset,
1869 Data);
1870 if (status < 0) {
1871 dbg("Writing spreg failed in set_serial_baud");
1872 return -1;
1873 }
1874 /* Calculate the Divisor */
1875
1876 if (status) {
1877 dev_err(&port->dev, "%s - bad baud rate\n", __func__);
1878 return status;
1879 }
1880 /* Enable access to divisor latch */
1881 Data = mos7840_port->shadowLCR | SERIAL_LCR_DLAB;
1882 mos7840_port->shadowLCR = Data;
1883 mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data);
1884
1885 /* Write the divisor */
1886 Data = (unsigned char)(divisor & 0xff);
1887 dbg("set_serial_baud Value to write DLL is %x", Data);
1888 mos7840_set_uart_reg(port, DIVISOR_LATCH_LSB, Data);
1889
1890 Data = (unsigned char)((divisor & 0xff00) >> 8);
1891 dbg("set_serial_baud Value to write DLM is %x", Data);
1892 mos7840_set_uart_reg(port, DIVISOR_LATCH_MSB, Data);
1893
1894 /* Disable access to divisor latch */
1895 Data = mos7840_port->shadowLCR & ~SERIAL_LCR_DLAB;
1896 mos7840_port->shadowLCR = Data;
1897 mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data);
1898
1899 }
1900 return status;
1901 }
1902
1903 /*****************************************************************************
1904 * mos7840_change_port_settings
1905 * This routine is called to set the UART on the device to match
1906 * the specified new settings.
1907 *****************************************************************************/
1908
1909 static void mos7840_change_port_settings(struct tty_struct *tty,
1910 struct moschip_port *mos7840_port, struct ktermios *old_termios)
1911 {
1912 int baud;
1913 unsigned cflag;
1914 unsigned iflag;
1915 __u8 lData;
1916 __u8 lParity;
1917 __u8 lStop;
1918 int status;
1919 __u16 Data;
1920 struct usb_serial_port *port;
1921 struct usb_serial *serial;
1922
1923 if (mos7840_port == NULL)
1924 return;
1925
1926 port = (struct usb_serial_port *)mos7840_port->port;
1927
1928 if (mos7840_port_paranoia_check(port, __func__)) {
1929 dbg("%s", "Invalid port");
1930 return;
1931 }
1932
1933 if (mos7840_serial_paranoia_check(port->serial, __func__)) {
1934 dbg("%s", "Invalid Serial");
1935 return;
1936 }
1937
1938 serial = port->serial;
1939
1940 dbg("%s - port %d", __func__, mos7840_port->port->number);
1941
1942 if (!mos7840_port->open) {
1943 dbg("%s - port not opened", __func__);
1944 return;
1945 }
1946
1947 dbg("%s", "Entering ..........");
1948
1949 lData = LCR_BITS_8;
1950 lStop = LCR_STOP_1;
1951 lParity = LCR_PAR_NONE;
1952
1953 cflag = tty->termios->c_cflag;
1954 iflag = tty->termios->c_iflag;
1955
1956 /* Change the number of bits */
1957 if (cflag & CSIZE) {
1958 switch (cflag & CSIZE) {
1959 case CS5:
1960 lData = LCR_BITS_5;
1961 break;
1962
1963 case CS6:
1964 lData = LCR_BITS_6;
1965 break;
1966
1967 case CS7:
1968 lData = LCR_BITS_7;
1969 break;
1970 default:
1971 case CS8:
1972 lData = LCR_BITS_8;
1973 break;
1974 }
1975 }
1976 /* Change the Parity bit */
1977 if (cflag & PARENB) {
1978 if (cflag & PARODD) {
1979 lParity = LCR_PAR_ODD;
1980 dbg("%s - parity = odd", __func__);
1981 } else {
1982 lParity = LCR_PAR_EVEN;
1983 dbg("%s - parity = even", __func__);
1984 }
1985
1986 } else {
1987 dbg("%s - parity = none", __func__);
1988 }
1989
1990 if (cflag & CMSPAR)
1991 lParity = lParity | 0x20;
1992
1993 /* Change the Stop bit */
1994 if (cflag & CSTOPB) {
1995 lStop = LCR_STOP_2;
1996 dbg("%s - stop bits = 2", __func__);
1997 } else {
1998 lStop = LCR_STOP_1;
1999 dbg("%s - stop bits = 1", __func__);
2000 }
2001
2002 /* Update the LCR with the correct value */
2003 mos7840_port->shadowLCR &=
2004 ~(LCR_BITS_MASK | LCR_STOP_MASK | LCR_PAR_MASK);
2005 mos7840_port->shadowLCR |= (lData | lParity | lStop);
2006
2007 dbg("mos7840_change_port_settings mos7840_port->shadowLCR is %x",
2008 mos7840_port->shadowLCR);
2009 /* Disable Interrupts */
2010 Data = 0x00;
2011 mos7840_set_uart_reg(port, INTERRUPT_ENABLE_REGISTER, Data);
2012
2013 Data = 0x00;
2014 mos7840_set_uart_reg(port, FIFO_CONTROL_REGISTER, Data);
2015
2016 Data = 0xcf;
2017 mos7840_set_uart_reg(port, FIFO_CONTROL_REGISTER, Data);
2018
2019 /* Send the updated LCR value to the mos7840 */
2020 Data = mos7840_port->shadowLCR;
2021
2022 mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data);
2023
2024 Data = 0x00b;
2025 mos7840_port->shadowMCR = Data;
2026 mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER, Data);
2027 Data = 0x00b;
2028 mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER, Data);
2029
2030 /* set up the MCR register and send it to the mos7840 */
2031
2032 mos7840_port->shadowMCR = MCR_MASTER_IE;
2033 if (cflag & CBAUD)
2034 mos7840_port->shadowMCR |= (MCR_DTR | MCR_RTS);
2035
2036 if (cflag & CRTSCTS)
2037 mos7840_port->shadowMCR |= (MCR_XON_ANY);
2038 else
2039 mos7840_port->shadowMCR &= ~(MCR_XON_ANY);
2040
2041 Data = mos7840_port->shadowMCR;
2042 mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER, Data);
2043
2044 /* Determine divisor based on baud rate */
2045 baud = tty_get_baud_rate(tty);
2046
2047 if (!baud) {
2048 /* pick a default, any default... */
2049 dbg("%s", "Picked default baud...");
2050 baud = 9600;
2051 }
2052
2053 dbg("%s - baud rate = %d", __func__, baud);
2054 status = mos7840_send_cmd_write_baud_rate(mos7840_port, baud);
2055
2056 /* Enable Interrupts */
2057 Data = 0x0c;
2058 mos7840_set_uart_reg(port, INTERRUPT_ENABLE_REGISTER, Data);
2059
2060 if (mos7840_port->read_urb_busy == false) {
2061 mos7840_port->read_urb->dev = serial->dev;
2062 mos7840_port->read_urb_busy = true;
2063 status = usb_submit_urb(mos7840_port->read_urb, GFP_ATOMIC);
2064 if (status) {
2065 dbg("usb_submit_urb(read bulk) failed, status = %d",
2066 status);
2067 mos7840_port->read_urb_busy = false;
2068 }
2069 }
2070 wake_up(&mos7840_port->delta_msr_wait);
2071 mos7840_port->delta_msr_cond = 1;
2072 dbg("mos7840_change_port_settings mos7840_port->shadowLCR is End %x",
2073 mos7840_port->shadowLCR);
2074 }
2075
2076 /*****************************************************************************
2077 * mos7840_set_termios
2078 * this function is called by the tty driver when it wants to change
2079 * the termios structure
2080 *****************************************************************************/
2081
2082 static void mos7840_set_termios(struct tty_struct *tty,
2083 struct usb_serial_port *port,
2084 struct ktermios *old_termios)
2085 {
2086 int status;
2087 unsigned int cflag;
2088 struct usb_serial *serial;
2089 struct moschip_port *mos7840_port;
2090 dbg("mos7840_set_termios: START");
2091 if (mos7840_port_paranoia_check(port, __func__)) {
2092 dbg("%s", "Invalid port");
2093 return;
2094 }
2095
2096 serial = port->serial;
2097
2098 if (mos7840_serial_paranoia_check(serial, __func__)) {
2099 dbg("%s", "Invalid Serial");
2100 return;
2101 }
2102
2103 mos7840_port = mos7840_get_port_private(port);
2104
2105 if (mos7840_port == NULL)
2106 return;
2107
2108 if (!mos7840_port->open) {
2109 dbg("%s - port not opened", __func__);
2110 return;
2111 }
2112
2113 dbg("%s", "setting termios - ");
2114
2115 cflag = tty->termios->c_cflag;
2116
2117 dbg("%s - clfag %08x iflag %08x", __func__,
2118 tty->termios->c_cflag, RELEVANT_IFLAG(tty->termios->c_iflag));
2119 dbg("%s - old clfag %08x old iflag %08x", __func__,
2120 old_termios->c_cflag, RELEVANT_IFLAG(old_termios->c_iflag));
2121 dbg("%s - port %d", __func__, port->number);
2122
2123 /* change the port settings to the new ones specified */
2124
2125 mos7840_change_port_settings(tty, mos7840_port, old_termios);
2126
2127 if (!mos7840_port->read_urb) {
2128 dbg("%s", "URB KILLED !!!!!");
2129 return;
2130 }
2131
2132 if (mos7840_port->read_urb_busy == false) {
2133 mos7840_port->read_urb->dev = serial->dev;
2134 mos7840_port->read_urb_busy = true;
2135 status = usb_submit_urb(mos7840_port->read_urb, GFP_ATOMIC);
2136 if (status) {
2137 dbg("usb_submit_urb(read bulk) failed, status = %d",
2138 status);
2139 mos7840_port->read_urb_busy = false;
2140 }
2141 }
2142 }
2143
2144 /*****************************************************************************
2145 * mos7840_get_lsr_info - get line status register info
2146 *
2147 * Purpose: Let user call ioctl() to get info when the UART physically
2148 * is emptied. On bus types like RS485, the transmitter must
2149 * release the bus after transmitting. This must be done when
2150 * the transmit shift register is empty, not be done when the
2151 * transmit holding register is empty. This functionality
2152 * allows an RS485 driver to be written in user space.
2153 *****************************************************************************/
2154
2155 static int mos7840_get_lsr_info(struct tty_struct *tty,
2156 unsigned int __user *value)
2157 {
2158 int count;
2159 unsigned int result = 0;
2160
2161 count = mos7840_chars_in_buffer(tty);
2162 if (count == 0) {
2163 dbg("%s -- Empty", __func__);
2164 result = TIOCSER_TEMT;
2165 }
2166
2167 if (copy_to_user(value, &result, sizeof(int)))
2168 return -EFAULT;
2169 return 0;
2170 }
2171
2172 /*****************************************************************************
2173 * mos7840_get_serial_info
2174 * function to get information about serial port
2175 *****************************************************************************/
2176
2177 static int mos7840_get_serial_info(struct moschip_port *mos7840_port,
2178 struct serial_struct __user *retinfo)
2179 {
2180 struct serial_struct tmp;
2181
2182 if (mos7840_port == NULL)
2183 return -1;
2184
2185 if (!retinfo)
2186 return -EFAULT;
2187
2188 memset(&tmp, 0, sizeof(tmp));
2189
2190 tmp.type = PORT_16550A;
2191 tmp.line = mos7840_port->port->serial->minor;
2192 tmp.port = mos7840_port->port->number;
2193 tmp.irq = 0;
2194 tmp.flags = ASYNC_SKIP_TEST | ASYNC_AUTO_IRQ;
2195 tmp.xmit_fifo_size = NUM_URBS * URB_TRANSFER_BUFFER_SIZE;
2196 tmp.baud_base = 9600;
2197 tmp.close_delay = 5 * HZ;
2198 tmp.closing_wait = 30 * HZ;
2199
2200 if (copy_to_user(retinfo, &tmp, sizeof(*retinfo)))
2201 return -EFAULT;
2202 return 0;
2203 }
2204
2205 static int mos7840_get_icount(struct tty_struct *tty,
2206 struct serial_icounter_struct *icount)
2207 {
2208 struct usb_serial_port *port = tty->driver_data;
2209 struct moschip_port *mos7840_port;
2210 struct async_icount cnow;
2211
2212 mos7840_port = mos7840_get_port_private(port);
2213 cnow = mos7840_port->icount;
2214
2215 smp_rmb();
2216 icount->cts = cnow.cts;
2217 icount->dsr = cnow.dsr;
2218 icount->rng = cnow.rng;
2219 icount->dcd = cnow.dcd;
2220 icount->rx = cnow.rx;
2221 icount->tx = cnow.tx;
2222 icount->frame = cnow.frame;
2223 icount->overrun = cnow.overrun;
2224 icount->parity = cnow.parity;
2225 icount->brk = cnow.brk;
2226 icount->buf_overrun = cnow.buf_overrun;
2227
2228 dbg("%s (%d) TIOCGICOUNT RX=%d, TX=%d", __func__,
2229 port->number, icount->rx, icount->tx);
2230 return 0;
2231 }
2232
2233 /*****************************************************************************
2234 * SerialIoctl
2235 * this function handles any ioctl calls to the driver
2236 *****************************************************************************/
2237
2238 static int mos7840_ioctl(struct tty_struct *tty,
2239 unsigned int cmd, unsigned long arg)
2240 {
2241 struct usb_serial_port *port = tty->driver_data;
2242 void __user *argp = (void __user *)arg;
2243 struct moschip_port *mos7840_port;
2244
2245 struct async_icount cnow;
2246 struct async_icount cprev;
2247
2248 if (mos7840_port_paranoia_check(port, __func__)) {
2249 dbg("%s", "Invalid port");
2250 return -1;
2251 }
2252
2253 mos7840_port = mos7840_get_port_private(port);
2254
2255 if (mos7840_port == NULL)
2256 return -1;
2257
2258 dbg("%s - port %d, cmd = 0x%x", __func__, port->number, cmd);
2259
2260 switch (cmd) {
2261 /* return number of bytes available */
2262
2263 case TIOCSERGETLSR:
2264 dbg("%s (%d) TIOCSERGETLSR", __func__, port->number);
2265 return mos7840_get_lsr_info(tty, argp);
2266
2267 case TIOCGSERIAL:
2268 dbg("%s (%d) TIOCGSERIAL", __func__, port->number);
2269 return mos7840_get_serial_info(mos7840_port, argp);
2270
2271 case TIOCSSERIAL:
2272 dbg("%s (%d) TIOCSSERIAL", __func__, port->number);
2273 break;
2274
2275 case TIOCMIWAIT:
2276 dbg("%s (%d) TIOCMIWAIT", __func__, port->number);
2277 cprev = mos7840_port->icount;
2278 while (1) {
2279 /* interruptible_sleep_on(&mos7840_port->delta_msr_wait); */
2280 mos7840_port->delta_msr_cond = 0;
2281 wait_event_interruptible(mos7840_port->delta_msr_wait,
2282 (mos7840_port->
2283 delta_msr_cond == 1));
2284
2285 /* see if a signal did it */
2286 if (signal_pending(current))
2287 return -ERESTARTSYS;
2288 cnow = mos7840_port->icount;
2289 smp_rmb();
2290 if (cnow.rng == cprev.rng && cnow.dsr == cprev.dsr &&
2291 cnow.dcd == cprev.dcd && cnow.cts == cprev.cts)
2292 return -EIO; /* no change => error */
2293 if (((arg & TIOCM_RNG) && (cnow.rng != cprev.rng)) ||
2294 ((arg & TIOCM_DSR) && (cnow.dsr != cprev.dsr)) ||
2295 ((arg & TIOCM_CD) && (cnow.dcd != cprev.dcd)) ||
2296 ((arg & TIOCM_CTS) && (cnow.cts != cprev.cts))) {
2297 return 0;
2298 }
2299 cprev = cnow;
2300 }
2301 /* NOTREACHED */
2302 break;
2303
2304 default:
2305 break;
2306 }
2307 return -ENOIOCTLCMD;
2308 }
2309
2310 static int mos7840_calc_num_ports(struct usb_serial *serial)
2311 {
2312 int mos7840_num_ports = 0;
2313
2314 dbg("numberofendpoints: cur %d, alt %d",
2315 (int)serial->interface->cur_altsetting->desc.bNumEndpoints,
2316 (int)serial->interface->altsetting->desc.bNumEndpoints);
2317 if (serial->interface->cur_altsetting->desc.bNumEndpoints == 5) {
2318 mos7840_num_ports = serial->num_ports = 2;
2319 } else if (serial->interface->cur_altsetting->desc.bNumEndpoints == 9) {
2320 serial->num_bulk_in = 4;
2321 serial->num_bulk_out = 4;
2322 mos7840_num_ports = serial->num_ports = 4;
2323 }
2324 dbg ("mos7840_num_ports = %d", mos7840_num_ports);
2325 return mos7840_num_ports;
2326 }
2327
2328 /****************************************************************************
2329 * mos7840_startup
2330 ****************************************************************************/
2331
2332 static int mos7840_startup(struct usb_serial *serial)
2333 {
2334 struct moschip_port *mos7840_port;
2335 struct usb_device *dev;
2336 int i, status;
2337
2338 __u16 Data;
2339 dbg("%s", "mos7840_startup :Entering..........");
2340
2341 if (!serial) {
2342 dbg("%s", "Invalid Handler");
2343 return -1;
2344 }
2345
2346 dev = serial->dev;
2347
2348 dbg("%s", "Entering...");
2349 dbg ("mos7840_startup: serial = %p", serial);
2350
2351 /* we set up the pointers to the endpoints in the mos7840_open *
2352 * function, as the structures aren't created yet. */
2353
2354 /* set up port private structures */
2355 for (i = 0; i < serial->num_ports; ++i) {
2356 dbg ("mos7840_startup: configuring port %d............", i);
2357 mos7840_port = kzalloc(sizeof(struct moschip_port), GFP_KERNEL);
2358 if (mos7840_port == NULL) {
2359 dev_err(&dev->dev, "%s - Out of memory\n", __func__);
2360 status = -ENOMEM;
2361 i--; /* don't follow NULL pointer cleaning up */
2362 goto error;
2363 }
2364
2365 /* Initialize all port interrupt end point to port 0 int
2366 * endpoint. Our device has only one interrupt end point
2367 * common to all port */
2368
2369 mos7840_port->port = serial->port[i];
2370 mos7840_set_port_private(serial->port[i], mos7840_port);
2371 spin_lock_init(&mos7840_port->pool_lock);
2372
2373 /* minor is not initialised until later by
2374 * usb-serial.c:get_free_serial() and cannot therefore be used
2375 * to index device instances */
2376 mos7840_port->port_num = i + 1;
2377 dbg ("serial->port[i]->number = %d", serial->port[i]->number);
2378 dbg ("serial->port[i]->serial->minor = %d", serial->port[i]->serial->minor);
2379 dbg ("mos7840_port->port_num = %d", mos7840_port->port_num);
2380 dbg ("serial->minor = %d", serial->minor);
2381
2382 if (mos7840_port->port_num == 1) {
2383 mos7840_port->SpRegOffset = 0x0;
2384 mos7840_port->ControlRegOffset = 0x1;
2385 mos7840_port->DcrRegOffset = 0x4;
2386 } else if ((mos7840_port->port_num == 2)
2387 && (serial->num_ports == 4)) {
2388 mos7840_port->SpRegOffset = 0x8;
2389 mos7840_port->ControlRegOffset = 0x9;
2390 mos7840_port->DcrRegOffset = 0x16;
2391 } else if ((mos7840_port->port_num == 2)
2392 && (serial->num_ports == 2)) {
2393 mos7840_port->SpRegOffset = 0xa;
2394 mos7840_port->ControlRegOffset = 0xb;
2395 mos7840_port->DcrRegOffset = 0x19;
2396 } else if ((mos7840_port->port_num == 3)
2397 && (serial->num_ports == 4)) {
2398 mos7840_port->SpRegOffset = 0xa;
2399 mos7840_port->ControlRegOffset = 0xb;
2400 mos7840_port->DcrRegOffset = 0x19;
2401 } else if ((mos7840_port->port_num == 4)
2402 && (serial->num_ports == 4)) {
2403 mos7840_port->SpRegOffset = 0xc;
2404 mos7840_port->ControlRegOffset = 0xd;
2405 mos7840_port->DcrRegOffset = 0x1c;
2406 }
2407 mos7840_dump_serial_port(mos7840_port);
2408 mos7840_set_port_private(serial->port[i], mos7840_port);
2409
2410 /* enable rx_disable bit in control register */
2411 status = mos7840_get_reg_sync(serial->port[i],
2412 mos7840_port->ControlRegOffset, &Data);
2413 if (status < 0) {
2414 dbg("Reading ControlReg failed status-0x%x", status);
2415 break;
2416 } else
2417 dbg("ControlReg Reading success val is %x, status%d",
2418 Data, status);
2419 Data |= 0x08; /* setting driver done bit */
2420 Data |= 0x04; /* sp1_bit to have cts change reflect in
2421 modem status reg */
2422
2423 /* Data |= 0x20; //rx_disable bit */
2424 status = mos7840_set_reg_sync(serial->port[i],
2425 mos7840_port->ControlRegOffset, Data);
2426 if (status < 0) {
2427 dbg("Writing ControlReg failed(rx_disable) status-0x%x", status);
2428 break;
2429 } else
2430 dbg("ControlReg Writing success(rx_disable) status%d",
2431 status);
2432
2433 /* Write default values in DCR (i.e 0x01 in DCR0, 0x05 in DCR2
2434 and 0x24 in DCR3 */
2435 Data = 0x01;
2436 status = mos7840_set_reg_sync(serial->port[i],
2437 (__u16) (mos7840_port->DcrRegOffset + 0), Data);
2438 if (status < 0) {
2439 dbg("Writing DCR0 failed status-0x%x", status);
2440 break;
2441 } else
2442 dbg("DCR0 Writing success status%d", status);
2443
2444 Data = 0x05;
2445 status = mos7840_set_reg_sync(serial->port[i],
2446 (__u16) (mos7840_port->DcrRegOffset + 1), Data);
2447 if (status < 0) {
2448 dbg("Writing DCR1 failed status-0x%x", status);
2449 break;
2450 } else
2451 dbg("DCR1 Writing success status%d", status);
2452
2453 Data = 0x24;
2454 status = mos7840_set_reg_sync(serial->port[i],
2455 (__u16) (mos7840_port->DcrRegOffset + 2), Data);
2456 if (status < 0) {
2457 dbg("Writing DCR2 failed status-0x%x", status);
2458 break;
2459 } else
2460 dbg("DCR2 Writing success status%d", status);
2461
2462 /* write values in clkstart0x0 and clkmulti 0x20 */
2463 Data = 0x0;
2464 status = mos7840_set_reg_sync(serial->port[i],
2465 CLK_START_VALUE_REGISTER, Data);
2466 if (status < 0) {
2467 dbg("Writing CLK_START_VALUE_REGISTER failed status-0x%x", status);
2468 break;
2469 } else
2470 dbg("CLK_START_VALUE_REGISTER Writing success status%d", status);
2471
2472 Data = 0x20;
2473 status = mos7840_set_reg_sync(serial->port[i],
2474 CLK_MULTI_REGISTER, Data);
2475 if (status < 0) {
2476 dbg("Writing CLK_MULTI_REGISTER failed status-0x%x",
2477 status);
2478 goto error;
2479 } else
2480 dbg("CLK_MULTI_REGISTER Writing success status%d",
2481 status);
2482
2483 /* write value 0x0 to scratchpad register */
2484 Data = 0x00;
2485 status = mos7840_set_uart_reg(serial->port[i],
2486 SCRATCH_PAD_REGISTER, Data);
2487 if (status < 0) {
2488 dbg("Writing SCRATCH_PAD_REGISTER failed status-0x%x",
2489 status);
2490 break;
2491 } else
2492 dbg("SCRATCH_PAD_REGISTER Writing success status%d",
2493 status);
2494
2495 /* Zero Length flag register */
2496 if ((mos7840_port->port_num != 1)
2497 && (serial->num_ports == 2)) {
2498
2499 Data = 0xff;
2500 status = mos7840_set_reg_sync(serial->port[i],
2501 (__u16) (ZLP_REG1 +
2502 ((__u16)mos7840_port->port_num)), Data);
2503 dbg("ZLIP offset %x",
2504 (__u16) (ZLP_REG1 +
2505 ((__u16) mos7840_port->port_num)));
2506 if (status < 0) {
2507 dbg("Writing ZLP_REG%d failed status-0x%x",
2508 i + 2, status);
2509 break;
2510 } else
2511 dbg("ZLP_REG%d Writing success status%d",
2512 i + 2, status);
2513 } else {
2514 Data = 0xff;
2515 status = mos7840_set_reg_sync(serial->port[i],
2516 (__u16) (ZLP_REG1 +
2517 ((__u16)mos7840_port->port_num) - 0x1), Data);
2518 dbg("ZLIP offset %x",
2519 (__u16) (ZLP_REG1 +
2520 ((__u16) mos7840_port->port_num) - 0x1));
2521 if (status < 0) {
2522 dbg("Writing ZLP_REG%d failed status-0x%x",
2523 i + 1, status);
2524 break;
2525 } else
2526 dbg("ZLP_REG%d Writing success status%d",
2527 i + 1, status);
2528
2529 }
2530 mos7840_port->control_urb = usb_alloc_urb(0, GFP_KERNEL);
2531 mos7840_port->ctrl_buf = kmalloc(16, GFP_KERNEL);
2532 mos7840_port->dr = kmalloc(sizeof(struct usb_ctrlrequest),
2533 GFP_KERNEL);
2534 if (!mos7840_port->control_urb || !mos7840_port->ctrl_buf ||
2535 !mos7840_port->dr) {
2536 status = -ENOMEM;
2537 goto error;
2538 }
2539 }
2540 dbg ("mos7840_startup: all ports configured...........");
2541
2542 /* Zero Length flag enable */
2543 Data = 0x0f;
2544 status = mos7840_set_reg_sync(serial->port[0], ZLP_REG5, Data);
2545 if (status < 0) {
2546 dbg("Writing ZLP_REG5 failed status-0x%x", status);
2547 goto error;
2548 } else
2549 dbg("ZLP_REG5 Writing success status%d", status);
2550
2551 /* setting configuration feature to one */
2552 usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0),
2553 (__u8) 0x03, 0x00, 0x01, 0x00, NULL, 0x00, 5 * HZ);
2554 return 0;
2555 error:
2556 for (/* nothing */; i >= 0; i--) {
2557 mos7840_port = mos7840_get_port_private(serial->port[i]);
2558
2559 kfree(mos7840_port->dr);
2560 kfree(mos7840_port->ctrl_buf);
2561 usb_free_urb(mos7840_port->control_urb);
2562 kfree(mos7840_port);
2563 serial->port[i] = NULL;
2564 }
2565 return status;
2566 }
2567
2568 /****************************************************************************
2569 * mos7840_disconnect
2570 * This function is called whenever the device is removed from the usb bus.
2571 ****************************************************************************/
2572
2573 static void mos7840_disconnect(struct usb_serial *serial)
2574 {
2575 int i;
2576 unsigned long flags;
2577 struct moschip_port *mos7840_port;
2578 dbg("%s", " disconnect :entering..........");
2579
2580 if (!serial) {
2581 dbg("%s", "Invalid Handler");
2582 return;
2583 }
2584
2585 /* check for the ports to be closed,close the ports and disconnect */
2586
2587 /* free private structure allocated for serial port *
2588 * stop reads and writes on all ports */
2589
2590 for (i = 0; i < serial->num_ports; ++i) {
2591 mos7840_port = mos7840_get_port_private(serial->port[i]);
2592 dbg ("mos7840_port %d = %p", i, mos7840_port);
2593 if (mos7840_port) {
2594 spin_lock_irqsave(&mos7840_port->pool_lock, flags);
2595 mos7840_port->zombie = 1;
2596 spin_unlock_irqrestore(&mos7840_port->pool_lock, flags);
2597 usb_kill_urb(mos7840_port->control_urb);
2598 }
2599 }
2600
2601 dbg("%s", "Thank u :: ");
2602
2603 }
2604
2605 /****************************************************************************
2606 * mos7840_release
2607 * This function is called when the usb_serial structure is freed.
2608 ****************************************************************************/
2609
2610 static void mos7840_release(struct usb_serial *serial)
2611 {
2612 int i;
2613 struct moschip_port *mos7840_port;
2614 dbg("%s", " release :entering..........");
2615
2616 if (!serial) {
2617 dbg("%s", "Invalid Handler");
2618 return;
2619 }
2620
2621 /* check for the ports to be closed,close the ports and disconnect */
2622
2623 /* free private structure allocated for serial port *
2624 * stop reads and writes on all ports */
2625
2626 for (i = 0; i < serial->num_ports; ++i) {
2627 mos7840_port = mos7840_get_port_private(serial->port[i]);
2628 dbg("mos7840_port %d = %p", i, mos7840_port);
2629 if (mos7840_port) {
2630 kfree(mos7840_port->ctrl_buf);
2631 kfree(mos7840_port->dr);
2632 kfree(mos7840_port);
2633 }
2634 }
2635
2636 dbg("%s", "Thank u :: ");
2637
2638 }
2639
2640 static struct usb_driver io_driver = {
2641 .name = "mos7840",
2642 .probe = usb_serial_probe,
2643 .disconnect = usb_serial_disconnect,
2644 .id_table = moschip_id_table_combined,
2645 .no_dynamic_id = 1,
2646 };
2647
2648 static struct usb_serial_driver moschip7840_4port_device = {
2649 .driver = {
2650 .owner = THIS_MODULE,
2651 .name = "mos7840",
2652 },
2653 .description = DRIVER_DESC,
2654 .usb_driver = &io_driver,
2655 .id_table = moschip_port_id_table,
2656 .num_ports = 4,
2657 .open = mos7840_open,
2658 .close = mos7840_close,
2659 .write = mos7840_write,
2660 .write_room = mos7840_write_room,
2661 .chars_in_buffer = mos7840_chars_in_buffer,
2662 .throttle = mos7840_throttle,
2663 .unthrottle = mos7840_unthrottle,
2664 .calc_num_ports = mos7840_calc_num_ports,
2665 #ifdef MCSSerialProbe
2666 .probe = mos7840_serial_probe,
2667 #endif
2668 .ioctl = mos7840_ioctl,
2669 .set_termios = mos7840_set_termios,
2670 .break_ctl = mos7840_break,
2671 .tiocmget = mos7840_tiocmget,
2672 .tiocmset = mos7840_tiocmset,
2673 .get_icount = mos7840_get_icount,
2674 .attach = mos7840_startup,
2675 .disconnect = mos7840_disconnect,
2676 .release = mos7840_release,
2677 .read_bulk_callback = mos7840_bulk_in_callback,
2678 .read_int_callback = mos7840_interrupt_callback,
2679 };
2680
2681 /****************************************************************************
2682 * moschip7840_init
2683 * This is called by the module subsystem, or on startup to initialize us
2684 ****************************************************************************/
2685 static int __init moschip7840_init(void)
2686 {
2687 int retval;
2688
2689 dbg("%s", " mos7840_init :entering..........");
2690
2691 /* Register with the usb serial */
2692 retval = usb_serial_register(&moschip7840_4port_device);
2693
2694 if (retval)
2695 goto failed_port_device_register;
2696
2697 dbg("%s", "Entering...");
2698 printk(KERN_INFO KBUILD_MODNAME ": " DRIVER_VERSION ":"
2699 DRIVER_DESC "\n");
2700
2701 /* Register with the usb */
2702 retval = usb_register(&io_driver);
2703 if (retval == 0) {
2704 dbg("%s", "Leaving...");
2705 return 0;
2706 }
2707 usb_serial_deregister(&moschip7840_4port_device);
2708 failed_port_device_register:
2709 return retval;
2710 }
2711
2712 /****************************************************************************
2713 * moschip7840_exit
2714 * Called when the driver is about to be unloaded.
2715 ****************************************************************************/
2716 static void __exit moschip7840_exit(void)
2717 {
2718
2719 dbg("%s", " mos7840_exit :entering..........");
2720
2721 usb_deregister(&io_driver);
2722
2723 usb_serial_deregister(&moschip7840_4port_device);
2724
2725 dbg("%s", "Entering...");
2726 }
2727
2728 module_init(moschip7840_init);
2729 module_exit(moschip7840_exit);
2730
2731 /* Module information */
2732 MODULE_DESCRIPTION(DRIVER_DESC);
2733 MODULE_LICENSE("GPL");
2734
2735 module_param(debug, bool, S_IRUGO | S_IWUSR);
2736 MODULE_PARM_DESC(debug, "Debug enabled or not");
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