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regulator: palmas: Fix off-by-one for ramp_delay and register value mapping
[mirror_ubuntu-hirsute-kernel.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 #define DRIVER_DESC "Moschip 7840/7820 USB Serial Driver"
39
40 /*
41 * 16C50 UART register defines
42 */
43
44 #define LCR_BITS_5 0x00 /* 5 bits/char */
45 #define LCR_BITS_6 0x01 /* 6 bits/char */
46 #define LCR_BITS_7 0x02 /* 7 bits/char */
47 #define LCR_BITS_8 0x03 /* 8 bits/char */
48 #define LCR_BITS_MASK 0x03 /* Mask for bits/char field */
49
50 #define LCR_STOP_1 0x00 /* 1 stop bit */
51 #define LCR_STOP_1_5 0x04 /* 1.5 stop bits (if 5 bits/char) */
52 #define LCR_STOP_2 0x04 /* 2 stop bits (if 6-8 bits/char) */
53 #define LCR_STOP_MASK 0x04 /* Mask for stop bits field */
54
55 #define LCR_PAR_NONE 0x00 /* No parity */
56 #define LCR_PAR_ODD 0x08 /* Odd parity */
57 #define LCR_PAR_EVEN 0x18 /* Even parity */
58 #define LCR_PAR_MARK 0x28 /* Force parity bit to 1 */
59 #define LCR_PAR_SPACE 0x38 /* Force parity bit to 0 */
60 #define LCR_PAR_MASK 0x38 /* Mask for parity field */
61
62 #define LCR_SET_BREAK 0x40 /* Set Break condition */
63 #define LCR_DL_ENABLE 0x80 /* Enable access to divisor latch */
64
65 #define MCR_DTR 0x01 /* Assert DTR */
66 #define MCR_RTS 0x02 /* Assert RTS */
67 #define MCR_OUT1 0x04 /* Loopback only: Sets state of RI */
68 #define MCR_MASTER_IE 0x08 /* Enable interrupt outputs */
69 #define MCR_LOOPBACK 0x10 /* Set internal (digital) loopback mode */
70 #define MCR_XON_ANY 0x20 /* Enable any char to exit XOFF mode */
71
72 #define MOS7840_MSR_CTS 0x10 /* Current state of CTS */
73 #define MOS7840_MSR_DSR 0x20 /* Current state of DSR */
74 #define MOS7840_MSR_RI 0x40 /* Current state of RI */
75 #define MOS7840_MSR_CD 0x80 /* Current state of CD */
76
77 /*
78 * Defines used for sending commands to port
79 */
80
81 #define MOS_WDR_TIMEOUT 5000 /* default urb timeout */
82
83 #define MOS_PORT1 0x0200
84 #define MOS_PORT2 0x0300
85 #define MOS_VENREG 0x0000
86 #define MOS_MAX_PORT 0x02
87 #define MOS_WRITE 0x0E
88 #define MOS_READ 0x0D
89
90 /* Requests */
91 #define MCS_RD_RTYPE 0xC0
92 #define MCS_WR_RTYPE 0x40
93 #define MCS_RDREQ 0x0D
94 #define MCS_WRREQ 0x0E
95 #define MCS_CTRL_TIMEOUT 500
96 #define VENDOR_READ_LENGTH (0x01)
97
98 #define MAX_NAME_LEN 64
99
100 #define ZLP_REG1 0x3A /* Zero_Flag_Reg1 58 */
101 #define ZLP_REG5 0x3E /* Zero_Flag_Reg5 62 */
102
103 /* For higher baud Rates use TIOCEXBAUD */
104 #define TIOCEXBAUD 0x5462
105
106 /* vendor id and device id defines */
107
108 /* The native mos7840/7820 component */
109 #define USB_VENDOR_ID_MOSCHIP 0x9710
110 #define MOSCHIP_DEVICE_ID_7840 0x7840
111 #define MOSCHIP_DEVICE_ID_7820 0x7820
112 #define MOSCHIP_DEVICE_ID_7810 0x7810
113 /* The native component can have its vendor/device id's overridden
114 * in vendor-specific implementations. Such devices can be handled
115 * by making a change here, in id_table.
116 */
117 #define USB_VENDOR_ID_BANDB 0x0856
118 #define BANDB_DEVICE_ID_USO9ML2_2 0xAC22
119 #define BANDB_DEVICE_ID_USO9ML2_2P 0xBC00
120 #define BANDB_DEVICE_ID_USO9ML2_4 0xAC24
121 #define BANDB_DEVICE_ID_USO9ML2_4P 0xBC01
122 #define BANDB_DEVICE_ID_US9ML2_2 0xAC29
123 #define BANDB_DEVICE_ID_US9ML2_4 0xAC30
124 #define BANDB_DEVICE_ID_USPTL4_2 0xAC31
125 #define BANDB_DEVICE_ID_USPTL4_4 0xAC32
126 #define BANDB_DEVICE_ID_USOPTL4_2 0xAC42
127 #define BANDB_DEVICE_ID_USOPTL4_2P 0xBC02
128 #define BANDB_DEVICE_ID_USOPTL4_4 0xAC44
129 #define BANDB_DEVICE_ID_USOPTL4_4P 0xBC03
130 #define BANDB_DEVICE_ID_USOPTL2_4 0xAC24
131
132 /* This driver also supports
133 * ATEN UC2324 device using Moschip MCS7840
134 * ATEN UC2322 device using Moschip MCS7820
135 */
136 #define USB_VENDOR_ID_ATENINTL 0x0557
137 #define ATENINTL_DEVICE_ID_UC2324 0x2011
138 #define ATENINTL_DEVICE_ID_UC2322 0x7820
139
140 /* Interrupt Routine Defines */
141
142 #define SERIAL_IIR_RLS 0x06
143 #define SERIAL_IIR_MS 0x00
144
145 /*
146 * Emulation of the bit mask on the LINE STATUS REGISTER.
147 */
148 #define SERIAL_LSR_DR 0x0001
149 #define SERIAL_LSR_OE 0x0002
150 #define SERIAL_LSR_PE 0x0004
151 #define SERIAL_LSR_FE 0x0008
152 #define SERIAL_LSR_BI 0x0010
153
154 #define MOS_MSR_DELTA_CTS 0x10
155 #define MOS_MSR_DELTA_DSR 0x20
156 #define MOS_MSR_DELTA_RI 0x40
157 #define MOS_MSR_DELTA_CD 0x80
158
159 /* Serial Port register Address */
160 #define INTERRUPT_ENABLE_REGISTER ((__u16)(0x01))
161 #define FIFO_CONTROL_REGISTER ((__u16)(0x02))
162 #define LINE_CONTROL_REGISTER ((__u16)(0x03))
163 #define MODEM_CONTROL_REGISTER ((__u16)(0x04))
164 #define LINE_STATUS_REGISTER ((__u16)(0x05))
165 #define MODEM_STATUS_REGISTER ((__u16)(0x06))
166 #define SCRATCH_PAD_REGISTER ((__u16)(0x07))
167 #define DIVISOR_LATCH_LSB ((__u16)(0x00))
168 #define DIVISOR_LATCH_MSB ((__u16)(0x01))
169
170 #define CLK_MULTI_REGISTER ((__u16)(0x02))
171 #define CLK_START_VALUE_REGISTER ((__u16)(0x03))
172 #define GPIO_REGISTER ((__u16)(0x07))
173
174 #define SERIAL_LCR_DLAB ((__u16)(0x0080))
175
176 /*
177 * URB POOL related defines
178 */
179 #define NUM_URBS 16 /* URB Count */
180 #define URB_TRANSFER_BUFFER_SIZE 32 /* URB Size */
181
182 /* LED on/off milliseconds*/
183 #define LED_ON_MS 500
184 #define LED_OFF_MS 500
185
186 static int device_type;
187
188 static const struct usb_device_id id_table[] = {
189 {USB_DEVICE(USB_VENDOR_ID_MOSCHIP, MOSCHIP_DEVICE_ID_7840)},
190 {USB_DEVICE(USB_VENDOR_ID_MOSCHIP, MOSCHIP_DEVICE_ID_7820)},
191 {USB_DEVICE(USB_VENDOR_ID_MOSCHIP, MOSCHIP_DEVICE_ID_7810)},
192 {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USO9ML2_2)},
193 {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USO9ML2_2P)},
194 {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USO9ML2_4)},
195 {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USO9ML2_4P)},
196 {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_US9ML2_2)},
197 {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_US9ML2_4)},
198 {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USPTL4_2)},
199 {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USPTL4_4)},
200 {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USOPTL4_2)},
201 {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USOPTL4_2P)},
202 {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USOPTL4_4)},
203 {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USOPTL4_4P)},
204 {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USOPTL2_4)},
205 {USB_DEVICE(USB_VENDOR_ID_ATENINTL, ATENINTL_DEVICE_ID_UC2324)},
206 {USB_DEVICE(USB_VENDOR_ID_ATENINTL, ATENINTL_DEVICE_ID_UC2322)},
207 {} /* terminating entry */
208 };
209 MODULE_DEVICE_TABLE(usb, id_table);
210
211 /* This structure holds all of the local port information */
212
213 struct moschip_port {
214 int port_num; /*Actual port number in the device(1,2,etc) */
215 struct urb *write_urb; /* write URB for this port */
216 struct urb *read_urb; /* read URB for this port */
217 __u8 shadowLCR; /* last LCR value received */
218 __u8 shadowMCR; /* last MCR value received */
219 char open;
220 char open_ports;
221 wait_queue_head_t wait_chase; /* for handling sleeping while waiting for chase to finish */
222 wait_queue_head_t delta_msr_wait; /* for handling sleeping while waiting for msr change to happen */
223 int delta_msr_cond;
224 struct async_icount icount;
225 struct usb_serial_port *port; /* loop back to the owner of this object */
226
227 /* Offsets */
228 __u8 SpRegOffset;
229 __u8 ControlRegOffset;
230 __u8 DcrRegOffset;
231 /* for processing control URBS in interrupt context */
232 struct urb *control_urb;
233 struct usb_ctrlrequest *dr;
234 char *ctrl_buf;
235 int MsrLsr;
236
237 spinlock_t pool_lock;
238 struct urb *write_urb_pool[NUM_URBS];
239 char busy[NUM_URBS];
240 bool read_urb_busy;
241
242 /* For device(s) with LED indicator */
243 bool has_led;
244 bool led_flag;
245 struct timer_list led_timer1; /* Timer for LED on */
246 struct timer_list led_timer2; /* Timer for LED off */
247 };
248
249 /*
250 * mos7840_set_reg_sync
251 * To set the Control register by calling usb_fill_control_urb function
252 * by passing usb_sndctrlpipe function as parameter.
253 */
254
255 static int mos7840_set_reg_sync(struct usb_serial_port *port, __u16 reg,
256 __u16 val)
257 {
258 struct usb_device *dev = port->serial->dev;
259 val = val & 0x00ff;
260 dev_dbg(&port->dev, "mos7840_set_reg_sync offset is %x, value %x\n", reg, val);
261
262 return usb_control_msg(dev, usb_sndctrlpipe(dev, 0), MCS_WRREQ,
263 MCS_WR_RTYPE, val, reg, NULL, 0,
264 MOS_WDR_TIMEOUT);
265 }
266
267 /*
268 * mos7840_get_reg_sync
269 * To set the Uart register by calling usb_fill_control_urb function by
270 * passing usb_rcvctrlpipe function as parameter.
271 */
272
273 static int mos7840_get_reg_sync(struct usb_serial_port *port, __u16 reg,
274 __u16 *val)
275 {
276 struct usb_device *dev = port->serial->dev;
277 int ret = 0;
278 u8 *buf;
279
280 buf = kmalloc(VENDOR_READ_LENGTH, GFP_KERNEL);
281 if (!buf)
282 return -ENOMEM;
283
284 ret = usb_control_msg(dev, usb_rcvctrlpipe(dev, 0), MCS_RDREQ,
285 MCS_RD_RTYPE, 0, reg, buf, VENDOR_READ_LENGTH,
286 MOS_WDR_TIMEOUT);
287 *val = buf[0];
288 dev_dbg(&port->dev, "%s offset is %x, return val %x\n", __func__, reg, *val);
289
290 kfree(buf);
291 return ret;
292 }
293
294 /*
295 * mos7840_set_uart_reg
296 * To set the Uart register by calling usb_fill_control_urb function by
297 * passing usb_sndctrlpipe function as parameter.
298 */
299
300 static int mos7840_set_uart_reg(struct usb_serial_port *port, __u16 reg,
301 __u16 val)
302 {
303
304 struct usb_device *dev = port->serial->dev;
305 val = val & 0x00ff;
306 /* For the UART control registers, the application number need
307 to be Or'ed */
308 if (port->serial->num_ports == 4) {
309 val |= (((__u16) port->number -
310 (__u16) (port->serial->minor)) + 1) << 8;
311 } else {
312 if (((__u16) port->number - (__u16) (port->serial->minor)) == 0) {
313 val |= (((__u16) port->number -
314 (__u16) (port->serial->minor)) + 1) << 8;
315 } else {
316 val |= (((__u16) port->number -
317 (__u16) (port->serial->minor)) + 2) << 8;
318 }
319 }
320 dev_dbg(&port->dev, "%s application number is %x\n", __func__, val);
321 return usb_control_msg(dev, usb_sndctrlpipe(dev, 0), MCS_WRREQ,
322 MCS_WR_RTYPE, val, reg, NULL, 0,
323 MOS_WDR_TIMEOUT);
324
325 }
326
327 /*
328 * mos7840_get_uart_reg
329 * To set the Control register by calling usb_fill_control_urb function
330 * by passing usb_rcvctrlpipe function as parameter.
331 */
332 static int mos7840_get_uart_reg(struct usb_serial_port *port, __u16 reg,
333 __u16 *val)
334 {
335 struct usb_device *dev = port->serial->dev;
336 int ret = 0;
337 __u16 Wval;
338 u8 *buf;
339
340 buf = kmalloc(VENDOR_READ_LENGTH, GFP_KERNEL);
341 if (!buf)
342 return -ENOMEM;
343
344 /* Wval is same as application number */
345 if (port->serial->num_ports == 4) {
346 Wval =
347 (((__u16) port->number - (__u16) (port->serial->minor)) +
348 1) << 8;
349 } else {
350 if (((__u16) port->number - (__u16) (port->serial->minor)) == 0) {
351 Wval = (((__u16) port->number -
352 (__u16) (port->serial->minor)) + 1) << 8;
353 } else {
354 Wval = (((__u16) port->number -
355 (__u16) (port->serial->minor)) + 2) << 8;
356 }
357 }
358 dev_dbg(&port->dev, "%s application number is %x\n", __func__, Wval);
359 ret = usb_control_msg(dev, usb_rcvctrlpipe(dev, 0), MCS_RDREQ,
360 MCS_RD_RTYPE, Wval, reg, buf, VENDOR_READ_LENGTH,
361 MOS_WDR_TIMEOUT);
362 *val = buf[0];
363
364 kfree(buf);
365 return ret;
366 }
367
368 static void mos7840_dump_serial_port(struct usb_serial_port *port,
369 struct moschip_port *mos7840_port)
370 {
371
372 dev_dbg(&port->dev, "SpRegOffset is %2x\n", mos7840_port->SpRegOffset);
373 dev_dbg(&port->dev, "ControlRegOffset is %2x\n", mos7840_port->ControlRegOffset);
374 dev_dbg(&port->dev, "DCRRegOffset is %2x\n", mos7840_port->DcrRegOffset);
375
376 }
377
378 /************************************************************************/
379 /************************************************************************/
380 /* I N T E R F A C E F U N C T I O N S */
381 /* I N T E R F A C E F U N C T I O N S */
382 /************************************************************************/
383 /************************************************************************/
384
385 static inline void mos7840_set_port_private(struct usb_serial_port *port,
386 struct moschip_port *data)
387 {
388 usb_set_serial_port_data(port, (void *)data);
389 }
390
391 static inline struct moschip_port *mos7840_get_port_private(struct
392 usb_serial_port
393 *port)
394 {
395 return (struct moschip_port *)usb_get_serial_port_data(port);
396 }
397
398 static void mos7840_handle_new_msr(struct moschip_port *port, __u8 new_msr)
399 {
400 struct moschip_port *mos7840_port;
401 struct async_icount *icount;
402 mos7840_port = port;
403 icount = &mos7840_port->icount;
404 if (new_msr &
405 (MOS_MSR_DELTA_CTS | MOS_MSR_DELTA_DSR | MOS_MSR_DELTA_RI |
406 MOS_MSR_DELTA_CD)) {
407 icount = &mos7840_port->icount;
408
409 /* update input line counters */
410 if (new_msr & MOS_MSR_DELTA_CTS) {
411 icount->cts++;
412 smp_wmb();
413 }
414 if (new_msr & MOS_MSR_DELTA_DSR) {
415 icount->dsr++;
416 smp_wmb();
417 }
418 if (new_msr & MOS_MSR_DELTA_CD) {
419 icount->dcd++;
420 smp_wmb();
421 }
422 if (new_msr & MOS_MSR_DELTA_RI) {
423 icount->rng++;
424 smp_wmb();
425 }
426 }
427 }
428
429 static void mos7840_handle_new_lsr(struct moschip_port *port, __u8 new_lsr)
430 {
431 struct async_icount *icount;
432
433 if (new_lsr & SERIAL_LSR_BI) {
434 /*
435 * Parity and Framing errors only count if they
436 * occur exclusive of a break being
437 * received.
438 */
439 new_lsr &= (__u8) (SERIAL_LSR_OE | SERIAL_LSR_BI);
440 }
441
442 /* update input line counters */
443 icount = &port->icount;
444 if (new_lsr & SERIAL_LSR_BI) {
445 icount->brk++;
446 smp_wmb();
447 }
448 if (new_lsr & SERIAL_LSR_OE) {
449 icount->overrun++;
450 smp_wmb();
451 }
452 if (new_lsr & SERIAL_LSR_PE) {
453 icount->parity++;
454 smp_wmb();
455 }
456 if (new_lsr & SERIAL_LSR_FE) {
457 icount->frame++;
458 smp_wmb();
459 }
460 }
461
462 /************************************************************************/
463 /************************************************************************/
464 /* U S B C A L L B A C K F U N C T I O N S */
465 /* U S B C A L L B A C K F U N C T I O N S */
466 /************************************************************************/
467 /************************************************************************/
468
469 static void mos7840_control_callback(struct urb *urb)
470 {
471 unsigned char *data;
472 struct moschip_port *mos7840_port;
473 struct device *dev = &urb->dev->dev;
474 __u8 regval = 0x0;
475 int status = urb->status;
476
477 mos7840_port = urb->context;
478
479 switch (status) {
480 case 0:
481 /* success */
482 break;
483 case -ECONNRESET:
484 case -ENOENT:
485 case -ESHUTDOWN:
486 /* this urb is terminated, clean up */
487 dev_dbg(dev, "%s - urb shutting down with status: %d\n", __func__, status);
488 return;
489 default:
490 dev_dbg(dev, "%s - nonzero urb status received: %d\n", __func__, status);
491 return;
492 }
493
494 dev_dbg(dev, "%s urb buffer size is %d\n", __func__, urb->actual_length);
495 dev_dbg(dev, "%s mos7840_port->MsrLsr is %d port %d\n", __func__,
496 mos7840_port->MsrLsr, mos7840_port->port_num);
497 data = urb->transfer_buffer;
498 regval = (__u8) data[0];
499 dev_dbg(dev, "%s data is %x\n", __func__, regval);
500 if (mos7840_port->MsrLsr == 0)
501 mos7840_handle_new_msr(mos7840_port, regval);
502 else if (mos7840_port->MsrLsr == 1)
503 mos7840_handle_new_lsr(mos7840_port, regval);
504 }
505
506 static int mos7840_get_reg(struct moschip_port *mcs, __u16 Wval, __u16 reg,
507 __u16 *val)
508 {
509 struct usb_device *dev = mcs->port->serial->dev;
510 struct usb_ctrlrequest *dr = mcs->dr;
511 unsigned char *buffer = mcs->ctrl_buf;
512 int ret;
513
514 dr->bRequestType = MCS_RD_RTYPE;
515 dr->bRequest = MCS_RDREQ;
516 dr->wValue = cpu_to_le16(Wval); /* 0 */
517 dr->wIndex = cpu_to_le16(reg);
518 dr->wLength = cpu_to_le16(2);
519
520 usb_fill_control_urb(mcs->control_urb, dev, usb_rcvctrlpipe(dev, 0),
521 (unsigned char *)dr, buffer, 2,
522 mos7840_control_callback, mcs);
523 mcs->control_urb->transfer_buffer_length = 2;
524 ret = usb_submit_urb(mcs->control_urb, GFP_ATOMIC);
525 return ret;
526 }
527
528 static void mos7840_set_led_callback(struct urb *urb)
529 {
530 switch (urb->status) {
531 case 0:
532 /* Success */
533 break;
534 case -ECONNRESET:
535 case -ENOENT:
536 case -ESHUTDOWN:
537 /* This urb is terminated, clean up */
538 dev_dbg(&urb->dev->dev, "%s - urb shutting down with status: %d",
539 __func__, urb->status);
540 break;
541 default:
542 dev_dbg(&urb->dev->dev, "%s - nonzero urb status received: %d",
543 __func__, urb->status);
544 }
545 }
546
547 static void mos7840_set_led_async(struct moschip_port *mcs, __u16 wval,
548 __u16 reg)
549 {
550 struct usb_device *dev = mcs->port->serial->dev;
551 struct usb_ctrlrequest *dr = mcs->dr;
552
553 dr->bRequestType = MCS_WR_RTYPE;
554 dr->bRequest = MCS_WRREQ;
555 dr->wValue = cpu_to_le16(wval);
556 dr->wIndex = cpu_to_le16(reg);
557 dr->wLength = cpu_to_le16(0);
558
559 usb_fill_control_urb(mcs->control_urb, dev, usb_sndctrlpipe(dev, 0),
560 (unsigned char *)dr, NULL, 0, mos7840_set_led_callback, NULL);
561
562 usb_submit_urb(mcs->control_urb, GFP_ATOMIC);
563 }
564
565 static void mos7840_set_led_sync(struct usb_serial_port *port, __u16 reg,
566 __u16 val)
567 {
568 struct usb_device *dev = port->serial->dev;
569
570 usb_control_msg(dev, usb_sndctrlpipe(dev, 0), MCS_WRREQ, MCS_WR_RTYPE,
571 val, reg, NULL, 0, MOS_WDR_TIMEOUT);
572 }
573
574 static void mos7840_led_off(unsigned long arg)
575 {
576 struct moschip_port *mcs = (struct moschip_port *) arg;
577
578 /* Turn off LED */
579 mos7840_set_led_async(mcs, 0x0300, MODEM_CONTROL_REGISTER);
580 mod_timer(&mcs->led_timer2,
581 jiffies + msecs_to_jiffies(LED_OFF_MS));
582 }
583
584 static void mos7840_led_flag_off(unsigned long arg)
585 {
586 struct moschip_port *mcs = (struct moschip_port *) arg;
587
588 mcs->led_flag = false;
589 }
590
591 /*****************************************************************************
592 * mos7840_interrupt_callback
593 * this is the callback function for when we have received data on the
594 * interrupt endpoint.
595 *****************************************************************************/
596
597 static void mos7840_interrupt_callback(struct urb *urb)
598 {
599 int result;
600 int length;
601 struct moschip_port *mos7840_port;
602 struct usb_serial *serial;
603 __u16 Data;
604 unsigned char *data;
605 __u8 sp[5], st;
606 int i, rv = 0;
607 __u16 wval, wreg = 0;
608 int status = urb->status;
609
610 switch (status) {
611 case 0:
612 /* success */
613 break;
614 case -ECONNRESET:
615 case -ENOENT:
616 case -ESHUTDOWN:
617 /* this urb is terminated, clean up */
618 dev_dbg(&urb->dev->dev, "%s - urb shutting down with status: %d\n",
619 __func__, status);
620 return;
621 default:
622 dev_dbg(&urb->dev->dev, "%s - nonzero urb status received: %d\n",
623 __func__, status);
624 goto exit;
625 }
626
627 length = urb->actual_length;
628 data = urb->transfer_buffer;
629
630 serial = urb->context;
631
632 /* Moschip get 5 bytes
633 * Byte 1 IIR Port 1 (port.number is 0)
634 * Byte 2 IIR Port 2 (port.number is 1)
635 * Byte 3 IIR Port 3 (port.number is 2)
636 * Byte 4 IIR Port 4 (port.number is 3)
637 * Byte 5 FIFO status for both */
638
639 if (length && length > 5) {
640 dev_dbg(&urb->dev->dev, "%s", "Wrong data !!!\n");
641 return;
642 }
643
644 sp[0] = (__u8) data[0];
645 sp[1] = (__u8) data[1];
646 sp[2] = (__u8) data[2];
647 sp[3] = (__u8) data[3];
648 st = (__u8) data[4];
649
650 for (i = 0; i < serial->num_ports; i++) {
651 mos7840_port = mos7840_get_port_private(serial->port[i]);
652 wval =
653 (((__u16) serial->port[i]->number -
654 (__u16) (serial->minor)) + 1) << 8;
655 if (mos7840_port->open) {
656 if (sp[i] & 0x01) {
657 dev_dbg(&urb->dev->dev, "SP%d No Interrupt !!!\n", i);
658 } else {
659 switch (sp[i] & 0x0f) {
660 case SERIAL_IIR_RLS:
661 dev_dbg(&urb->dev->dev, "Serial Port %d: Receiver status error or \n", i);
662 dev_dbg(&urb->dev->dev, "address bit detected in 9-bit mode\n");
663 mos7840_port->MsrLsr = 1;
664 wreg = LINE_STATUS_REGISTER;
665 break;
666 case SERIAL_IIR_MS:
667 dev_dbg(&urb->dev->dev, "Serial Port %d: Modem status change\n", i);
668 mos7840_port->MsrLsr = 0;
669 wreg = MODEM_STATUS_REGISTER;
670 break;
671 }
672 rv = mos7840_get_reg(mos7840_port, wval, wreg, &Data);
673 }
674 }
675 }
676 if (!(rv < 0))
677 /* the completion handler for the control urb will resubmit */
678 return;
679 exit:
680 result = usb_submit_urb(urb, GFP_ATOMIC);
681 if (result) {
682 dev_err(&urb->dev->dev,
683 "%s - Error %d submitting interrupt urb\n",
684 __func__, result);
685 }
686 }
687
688 static int mos7840_port_paranoia_check(struct usb_serial_port *port,
689 const char *function)
690 {
691 if (!port) {
692 pr_debug("%s - port == NULL\n", function);
693 return -1;
694 }
695 if (!port->serial) {
696 pr_debug("%s - port->serial == NULL\n", function);
697 return -1;
698 }
699
700 return 0;
701 }
702
703 /* Inline functions to check the sanity of a pointer that is passed to us */
704 static int mos7840_serial_paranoia_check(struct usb_serial *serial,
705 const char *function)
706 {
707 if (!serial) {
708 pr_debug("%s - serial == NULL\n", function);
709 return -1;
710 }
711 if (!serial->type) {
712 pr_debug("%s - serial->type == NULL!\n", function);
713 return -1;
714 }
715
716 return 0;
717 }
718
719 static struct usb_serial *mos7840_get_usb_serial(struct usb_serial_port *port,
720 const char *function)
721 {
722 /* if no port was specified, or it fails a paranoia check */
723 if (!port ||
724 mos7840_port_paranoia_check(port, function) ||
725 mos7840_serial_paranoia_check(port->serial, function)) {
726 /* then say that we don't have a valid usb_serial thing,
727 * which will end up genrating -ENODEV return values */
728 return NULL;
729 }
730
731 return port->serial;
732 }
733
734 /*****************************************************************************
735 * mos7840_bulk_in_callback
736 * this is the callback function for when we have received data on the
737 * bulk in endpoint.
738 *****************************************************************************/
739
740 static void mos7840_bulk_in_callback(struct urb *urb)
741 {
742 int retval;
743 unsigned char *data;
744 struct usb_serial *serial;
745 struct usb_serial_port *port;
746 struct moschip_port *mos7840_port;
747 int status = urb->status;
748
749 mos7840_port = urb->context;
750 if (!mos7840_port)
751 return;
752
753 if (status) {
754 dev_dbg(&urb->dev->dev, "nonzero read bulk status received: %d\n", status);
755 mos7840_port->read_urb_busy = false;
756 return;
757 }
758
759 port = mos7840_port->port;
760 if (mos7840_port_paranoia_check(port, __func__)) {
761 mos7840_port->read_urb_busy = false;
762 return;
763 }
764
765 serial = mos7840_get_usb_serial(port, __func__);
766 if (!serial) {
767 mos7840_port->read_urb_busy = false;
768 return;
769 }
770
771 data = urb->transfer_buffer;
772 usb_serial_debug_data(&port->dev, __func__, urb->actual_length, data);
773
774 if (urb->actual_length) {
775 struct tty_port *tport = &mos7840_port->port->port;
776 tty_insert_flip_string(tport, data, urb->actual_length);
777 tty_flip_buffer_push(tport);
778 mos7840_port->icount.rx += urb->actual_length;
779 smp_wmb();
780 dev_dbg(&port->dev, "mos7840_port->icount.rx is %d:\n", mos7840_port->icount.rx);
781 }
782
783 if (!mos7840_port->read_urb) {
784 dev_dbg(&port->dev, "%s", "URB KILLED !!!\n");
785 mos7840_port->read_urb_busy = false;
786 return;
787 }
788
789 /* Turn on LED */
790 if (mos7840_port->has_led && !mos7840_port->led_flag) {
791 mos7840_port->led_flag = true;
792 mos7840_set_led_async(mos7840_port, 0x0301,
793 MODEM_CONTROL_REGISTER);
794 mod_timer(&mos7840_port->led_timer1,
795 jiffies + msecs_to_jiffies(LED_ON_MS));
796 }
797
798 mos7840_port->read_urb_busy = true;
799 retval = usb_submit_urb(mos7840_port->read_urb, GFP_ATOMIC);
800
801 if (retval) {
802 dev_dbg(&port->dev, "usb_submit_urb(read bulk) failed, retval = %d\n", retval);
803 mos7840_port->read_urb_busy = false;
804 }
805 }
806
807 /*****************************************************************************
808 * mos7840_bulk_out_data_callback
809 * this is the callback function for when we have finished sending
810 * serial data on the bulk out endpoint.
811 *****************************************************************************/
812
813 static void mos7840_bulk_out_data_callback(struct urb *urb)
814 {
815 struct moschip_port *mos7840_port;
816 struct usb_serial_port *port;
817 struct tty_struct *tty;
818 int status = urb->status;
819 int i;
820
821 mos7840_port = urb->context;
822 port = mos7840_port->port;
823 spin_lock(&mos7840_port->pool_lock);
824 for (i = 0; i < NUM_URBS; i++) {
825 if (urb == mos7840_port->write_urb_pool[i]) {
826 mos7840_port->busy[i] = 0;
827 break;
828 }
829 }
830 spin_unlock(&mos7840_port->pool_lock);
831
832 if (status) {
833 dev_dbg(&port->dev, "nonzero write bulk status received:%d\n", status);
834 return;
835 }
836
837 if (mos7840_port_paranoia_check(port, __func__))
838 return;
839
840 tty = tty_port_tty_get(&port->port);
841 if (tty && mos7840_port->open)
842 tty_wakeup(tty);
843 tty_kref_put(tty);
844
845 }
846
847 /************************************************************************/
848 /* 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 */
849 /************************************************************************/
850 #ifdef MCSSerialProbe
851 static int mos7840_serial_probe(struct usb_serial *serial,
852 const struct usb_device_id *id)
853 {
854
855 /*need to implement the mode_reg reading and updating\
856 structures usb_serial_ device_type\
857 (i.e num_ports, num_bulkin,bulkout etc) */
858 /* Also we can update the changes attach */
859 return 1;
860 }
861 #endif
862
863 /*****************************************************************************
864 * mos7840_open
865 * this function is called by the tty driver when a port is opened
866 * If successful, we return 0
867 * Otherwise we return a negative error number.
868 *****************************************************************************/
869
870 static int mos7840_open(struct tty_struct *tty, struct usb_serial_port *port)
871 {
872 int response;
873 int j;
874 struct usb_serial *serial;
875 struct urb *urb;
876 __u16 Data;
877 int status;
878 struct moschip_port *mos7840_port;
879 struct moschip_port *port0;
880
881 if (mos7840_port_paranoia_check(port, __func__))
882 return -ENODEV;
883
884 serial = port->serial;
885
886 if (mos7840_serial_paranoia_check(serial, __func__))
887 return -ENODEV;
888
889 mos7840_port = mos7840_get_port_private(port);
890 port0 = mos7840_get_port_private(serial->port[0]);
891
892 if (mos7840_port == NULL || port0 == NULL)
893 return -ENODEV;
894
895 usb_clear_halt(serial->dev, port->write_urb->pipe);
896 usb_clear_halt(serial->dev, port->read_urb->pipe);
897 port0->open_ports++;
898
899 /* Initialising the write urb pool */
900 for (j = 0; j < NUM_URBS; ++j) {
901 urb = usb_alloc_urb(0, GFP_KERNEL);
902 mos7840_port->write_urb_pool[j] = urb;
903
904 if (urb == NULL) {
905 dev_err(&port->dev, "No more urbs???\n");
906 continue;
907 }
908
909 urb->transfer_buffer = kmalloc(URB_TRANSFER_BUFFER_SIZE,
910 GFP_KERNEL);
911 if (!urb->transfer_buffer) {
912 usb_free_urb(urb);
913 mos7840_port->write_urb_pool[j] = NULL;
914 dev_err(&port->dev,
915 "%s-out of memory for urb buffers.\n",
916 __func__);
917 continue;
918 }
919 }
920
921 /*****************************************************************************
922 * Initialize MCS7840 -- Write Init values to corresponding Registers
923 *
924 * Register Index
925 * 1 : IER
926 * 2 : FCR
927 * 3 : LCR
928 * 4 : MCR
929 *
930 * 0x08 : SP1/2 Control Reg
931 *****************************************************************************/
932
933 /* NEED to check the following Block */
934
935 Data = 0x0;
936 status = mos7840_get_reg_sync(port, mos7840_port->SpRegOffset, &Data);
937 if (status < 0) {
938 dev_dbg(&port->dev, "Reading Spreg failed\n");
939 return -1;
940 }
941 Data |= 0x80;
942 status = mos7840_set_reg_sync(port, mos7840_port->SpRegOffset, Data);
943 if (status < 0) {
944 dev_dbg(&port->dev, "writing Spreg failed\n");
945 return -1;
946 }
947
948 Data &= ~0x80;
949 status = mos7840_set_reg_sync(port, mos7840_port->SpRegOffset, Data);
950 if (status < 0) {
951 dev_dbg(&port->dev, "writing Spreg failed\n");
952 return -1;
953 }
954 /* End of block to be checked */
955
956 Data = 0x0;
957 status = mos7840_get_reg_sync(port, mos7840_port->ControlRegOffset,
958 &Data);
959 if (status < 0) {
960 dev_dbg(&port->dev, "Reading Controlreg failed\n");
961 return -1;
962 }
963 Data |= 0x08; /* Driver done bit */
964 Data |= 0x20; /* rx_disable */
965 status = mos7840_set_reg_sync(port,
966 mos7840_port->ControlRegOffset, Data);
967 if (status < 0) {
968 dev_dbg(&port->dev, "writing Controlreg failed\n");
969 return -1;
970 }
971 /* do register settings here */
972 /* Set all regs to the device default values. */
973 /***********************************
974 * First Disable all interrupts.
975 ***********************************/
976 Data = 0x00;
977 status = mos7840_set_uart_reg(port, INTERRUPT_ENABLE_REGISTER, Data);
978 if (status < 0) {
979 dev_dbg(&port->dev, "disabling interrupts failed\n");
980 return -1;
981 }
982 /* Set FIFO_CONTROL_REGISTER to the default value */
983 Data = 0x00;
984 status = mos7840_set_uart_reg(port, FIFO_CONTROL_REGISTER, Data);
985 if (status < 0) {
986 dev_dbg(&port->dev, "Writing FIFO_CONTROL_REGISTER failed\n");
987 return -1;
988 }
989
990 Data = 0xcf;
991 status = mos7840_set_uart_reg(port, FIFO_CONTROL_REGISTER, Data);
992 if (status < 0) {
993 dev_dbg(&port->dev, "Writing FIFO_CONTROL_REGISTER failed\n");
994 return -1;
995 }
996
997 Data = 0x03;
998 status = mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data);
999 mos7840_port->shadowLCR = Data;
1000
1001 Data = 0x0b;
1002 status = mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER, Data);
1003 mos7840_port->shadowMCR = Data;
1004
1005 Data = 0x00;
1006 status = mos7840_get_uart_reg(port, LINE_CONTROL_REGISTER, &Data);
1007 mos7840_port->shadowLCR = Data;
1008
1009 Data |= SERIAL_LCR_DLAB; /* data latch enable in LCR 0x80 */
1010 status = mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data);
1011
1012 Data = 0x0c;
1013 status = mos7840_set_uart_reg(port, DIVISOR_LATCH_LSB, Data);
1014
1015 Data = 0x0;
1016 status = mos7840_set_uart_reg(port, DIVISOR_LATCH_MSB, Data);
1017
1018 Data = 0x00;
1019 status = mos7840_get_uart_reg(port, LINE_CONTROL_REGISTER, &Data);
1020
1021 Data = Data & ~SERIAL_LCR_DLAB;
1022 status = mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data);
1023 mos7840_port->shadowLCR = Data;
1024
1025 /* clearing Bulkin and Bulkout Fifo */
1026 Data = 0x0;
1027 status = mos7840_get_reg_sync(port, mos7840_port->SpRegOffset, &Data);
1028
1029 Data = Data | 0x0c;
1030 status = mos7840_set_reg_sync(port, mos7840_port->SpRegOffset, Data);
1031
1032 Data = Data & ~0x0c;
1033 status = mos7840_set_reg_sync(port, mos7840_port->SpRegOffset, Data);
1034 /* Finally enable all interrupts */
1035 Data = 0x0c;
1036 status = mos7840_set_uart_reg(port, INTERRUPT_ENABLE_REGISTER, Data);
1037
1038 /* clearing rx_disable */
1039 Data = 0x0;
1040 status = mos7840_get_reg_sync(port, mos7840_port->ControlRegOffset,
1041 &Data);
1042 Data = Data & ~0x20;
1043 status = mos7840_set_reg_sync(port, mos7840_port->ControlRegOffset,
1044 Data);
1045
1046 /* rx_negate */
1047 Data = 0x0;
1048 status = mos7840_get_reg_sync(port, mos7840_port->ControlRegOffset,
1049 &Data);
1050 Data = Data | 0x10;
1051 status = mos7840_set_reg_sync(port, mos7840_port->ControlRegOffset,
1052 Data);
1053
1054 /* Check to see if we've set up our endpoint info yet *
1055 * (can't set it up in mos7840_startup as the structures *
1056 * were not set up at that time.) */
1057 if (port0->open_ports == 1) {
1058 if (serial->port[0]->interrupt_in_buffer == NULL) {
1059 /* set up interrupt urb */
1060 usb_fill_int_urb(serial->port[0]->interrupt_in_urb,
1061 serial->dev,
1062 usb_rcvintpipe(serial->dev,
1063 serial->port[0]->interrupt_in_endpointAddress),
1064 serial->port[0]->interrupt_in_buffer,
1065 serial->port[0]->interrupt_in_urb->
1066 transfer_buffer_length,
1067 mos7840_interrupt_callback,
1068 serial,
1069 serial->port[0]->interrupt_in_urb->interval);
1070
1071 /* start interrupt read for mos7840 *
1072 * will continue as long as mos7840 is connected */
1073
1074 response =
1075 usb_submit_urb(serial->port[0]->interrupt_in_urb,
1076 GFP_KERNEL);
1077 if (response) {
1078 dev_err(&port->dev, "%s - Error %d submitting "
1079 "interrupt urb\n", __func__, response);
1080 }
1081
1082 }
1083
1084 }
1085
1086 /* see if we've set up our endpoint info yet *
1087 * (can't set it up in mos7840_startup as the *
1088 * structures were not set up at that time.) */
1089
1090 dev_dbg(&port->dev, "port number is %d\n", port->number);
1091 dev_dbg(&port->dev, "serial number is %d\n", port->serial->minor);
1092 dev_dbg(&port->dev, "Bulkin endpoint is %d\n", port->bulk_in_endpointAddress);
1093 dev_dbg(&port->dev, "BulkOut endpoint is %d\n", port->bulk_out_endpointAddress);
1094 dev_dbg(&port->dev, "Interrupt endpoint is %d\n", port->interrupt_in_endpointAddress);
1095 dev_dbg(&port->dev, "port's number in the device is %d\n", mos7840_port->port_num);
1096 mos7840_port->read_urb = port->read_urb;
1097
1098 /* set up our bulk in urb */
1099 if ((serial->num_ports == 2)
1100 && ((((__u16)port->number -
1101 (__u16)(port->serial->minor)) % 2) != 0)) {
1102 usb_fill_bulk_urb(mos7840_port->read_urb,
1103 serial->dev,
1104 usb_rcvbulkpipe(serial->dev,
1105 (port->bulk_in_endpointAddress) + 2),
1106 port->bulk_in_buffer,
1107 mos7840_port->read_urb->transfer_buffer_length,
1108 mos7840_bulk_in_callback, mos7840_port);
1109 } else {
1110 usb_fill_bulk_urb(mos7840_port->read_urb,
1111 serial->dev,
1112 usb_rcvbulkpipe(serial->dev,
1113 port->bulk_in_endpointAddress),
1114 port->bulk_in_buffer,
1115 mos7840_port->read_urb->transfer_buffer_length,
1116 mos7840_bulk_in_callback, mos7840_port);
1117 }
1118
1119 dev_dbg(&port->dev, "%s: bulkin endpoint is %d\n", __func__, port->bulk_in_endpointAddress);
1120 mos7840_port->read_urb_busy = true;
1121 response = usb_submit_urb(mos7840_port->read_urb, GFP_KERNEL);
1122 if (response) {
1123 dev_err(&port->dev, "%s - Error %d submitting control urb\n",
1124 __func__, response);
1125 mos7840_port->read_urb_busy = false;
1126 }
1127
1128 /* initialize our wait queues */
1129 init_waitqueue_head(&mos7840_port->wait_chase);
1130 init_waitqueue_head(&mos7840_port->delta_msr_wait);
1131
1132 /* initialize our icount structure */
1133 memset(&(mos7840_port->icount), 0x00, sizeof(mos7840_port->icount));
1134
1135 /* initialize our port settings */
1136 /* Must set to enable ints! */
1137 mos7840_port->shadowMCR = MCR_MASTER_IE;
1138 /* send a open port command */
1139 mos7840_port->open = 1;
1140 /* mos7840_change_port_settings(mos7840_port,old_termios); */
1141 mos7840_port->icount.tx = 0;
1142 mos7840_port->icount.rx = 0;
1143
1144 return 0;
1145 }
1146
1147 /*****************************************************************************
1148 * mos7840_chars_in_buffer
1149 * this function is called by the tty driver when it wants to know how many
1150 * bytes of data we currently have outstanding in the port (data that has
1151 * been written, but hasn't made it out the port yet)
1152 * If successful, we return the number of bytes left to be written in the
1153 * system,
1154 * Otherwise we return zero.
1155 *****************************************************************************/
1156
1157 static int mos7840_chars_in_buffer(struct tty_struct *tty)
1158 {
1159 struct usb_serial_port *port = tty->driver_data;
1160 int i;
1161 int chars = 0;
1162 unsigned long flags;
1163 struct moschip_port *mos7840_port;
1164
1165 if (mos7840_port_paranoia_check(port, __func__))
1166 return 0;
1167
1168 mos7840_port = mos7840_get_port_private(port);
1169 if (mos7840_port == NULL)
1170 return 0;
1171
1172 spin_lock_irqsave(&mos7840_port->pool_lock, flags);
1173 for (i = 0; i < NUM_URBS; ++i) {
1174 if (mos7840_port->busy[i]) {
1175 struct urb *urb = mos7840_port->write_urb_pool[i];
1176 chars += urb->transfer_buffer_length;
1177 }
1178 }
1179 spin_unlock_irqrestore(&mos7840_port->pool_lock, flags);
1180 dev_dbg(&port->dev, "%s - returns %d\n", __func__, chars);
1181 return chars;
1182
1183 }
1184
1185 /*****************************************************************************
1186 * mos7840_close
1187 * this function is called by the tty driver when a port is closed
1188 *****************************************************************************/
1189
1190 static void mos7840_close(struct usb_serial_port *port)
1191 {
1192 struct usb_serial *serial;
1193 struct moschip_port *mos7840_port;
1194 struct moschip_port *port0;
1195 int j;
1196 __u16 Data;
1197
1198 if (mos7840_port_paranoia_check(port, __func__))
1199 return;
1200
1201 serial = mos7840_get_usb_serial(port, __func__);
1202 if (!serial)
1203 return;
1204
1205 mos7840_port = mos7840_get_port_private(port);
1206 port0 = mos7840_get_port_private(serial->port[0]);
1207
1208 if (mos7840_port == NULL || port0 == NULL)
1209 return;
1210
1211 for (j = 0; j < NUM_URBS; ++j)
1212 usb_kill_urb(mos7840_port->write_urb_pool[j]);
1213
1214 /* Freeing Write URBs */
1215 for (j = 0; j < NUM_URBS; ++j) {
1216 if (mos7840_port->write_urb_pool[j]) {
1217 if (mos7840_port->write_urb_pool[j]->transfer_buffer)
1218 kfree(mos7840_port->write_urb_pool[j]->
1219 transfer_buffer);
1220
1221 usb_free_urb(mos7840_port->write_urb_pool[j]);
1222 }
1223 }
1224
1225 /* While closing port, shutdown all bulk read, write *
1226 * and interrupt read if they exists */
1227 if (serial->dev) {
1228 if (mos7840_port->write_urb) {
1229 dev_dbg(&port->dev, "%s", "Shutdown bulk write\n");
1230 usb_kill_urb(mos7840_port->write_urb);
1231 }
1232 if (mos7840_port->read_urb) {
1233 dev_dbg(&port->dev, "%s", "Shutdown bulk read\n");
1234 usb_kill_urb(mos7840_port->read_urb);
1235 mos7840_port->read_urb_busy = false;
1236 }
1237 if ((&mos7840_port->control_urb)) {
1238 dev_dbg(&port->dev, "%s", "Shutdown control read\n");
1239 /*/ usb_kill_urb (mos7840_port->control_urb); */
1240 }
1241 }
1242 /* if(mos7840_port->ctrl_buf != NULL) */
1243 /* kfree(mos7840_port->ctrl_buf); */
1244 port0->open_ports--;
1245 dev_dbg(&port->dev, "%s in close%d:in port%d\n", __func__, port0->open_ports, port->number);
1246 if (port0->open_ports == 0) {
1247 if (serial->port[0]->interrupt_in_urb) {
1248 dev_dbg(&port->dev, "Shutdown interrupt_in_urb\n");
1249 usb_kill_urb(serial->port[0]->interrupt_in_urb);
1250 }
1251 }
1252
1253 if (mos7840_port->write_urb) {
1254 /* if this urb had a transfer buffer already (old tx) free it */
1255 if (mos7840_port->write_urb->transfer_buffer != NULL)
1256 kfree(mos7840_port->write_urb->transfer_buffer);
1257 usb_free_urb(mos7840_port->write_urb);
1258 }
1259
1260 Data = 0x0;
1261 mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER, Data);
1262
1263 Data = 0x00;
1264 mos7840_set_uart_reg(port, INTERRUPT_ENABLE_REGISTER, Data);
1265
1266 mos7840_port->open = 0;
1267 }
1268
1269 /************************************************************************
1270 *
1271 * mos7840_block_until_chase_response
1272 *
1273 * This function will block the close until one of the following:
1274 * 1. Response to our Chase comes from mos7840
1275 * 2. A timeout of 10 seconds without activity has expired
1276 * (1K of mos7840 data @ 2400 baud ==> 4 sec to empty)
1277 *
1278 ************************************************************************/
1279
1280 static void mos7840_block_until_chase_response(struct tty_struct *tty,
1281 struct moschip_port *mos7840_port)
1282 {
1283 int timeout = msecs_to_jiffies(1000);
1284 int wait = 10;
1285 int count;
1286
1287 while (1) {
1288 count = mos7840_chars_in_buffer(tty);
1289
1290 /* Check for Buffer status */
1291 if (count <= 0)
1292 return;
1293
1294 /* Block the thread for a while */
1295 interruptible_sleep_on_timeout(&mos7840_port->wait_chase,
1296 timeout);
1297 /* No activity.. count down section */
1298 wait--;
1299 if (wait == 0) {
1300 dev_dbg(&mos7840_port->port->dev, "%s - TIMEOUT\n", __func__);
1301 return;
1302 } else {
1303 /* Reset timeout value back to seconds */
1304 wait = 10;
1305 }
1306 }
1307
1308 }
1309
1310 /*****************************************************************************
1311 * mos7840_break
1312 * this function sends a break to the port
1313 *****************************************************************************/
1314 static void mos7840_break(struct tty_struct *tty, int break_state)
1315 {
1316 struct usb_serial_port *port = tty->driver_data;
1317 unsigned char data;
1318 struct usb_serial *serial;
1319 struct moschip_port *mos7840_port;
1320
1321 if (mos7840_port_paranoia_check(port, __func__))
1322 return;
1323
1324 serial = mos7840_get_usb_serial(port, __func__);
1325 if (!serial)
1326 return;
1327
1328 mos7840_port = mos7840_get_port_private(port);
1329
1330 if (mos7840_port == NULL)
1331 return;
1332
1333 if (serial->dev)
1334 /* flush and block until tx is empty */
1335 mos7840_block_until_chase_response(tty, mos7840_port);
1336
1337 if (break_state == -1)
1338 data = mos7840_port->shadowLCR | LCR_SET_BREAK;
1339 else
1340 data = mos7840_port->shadowLCR & ~LCR_SET_BREAK;
1341
1342 /* FIXME: no locking on shadowLCR anywhere in driver */
1343 mos7840_port->shadowLCR = data;
1344 dev_dbg(&port->dev, "%s mos7840_port->shadowLCR is %x\n", __func__, mos7840_port->shadowLCR);
1345 mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER,
1346 mos7840_port->shadowLCR);
1347 }
1348
1349 /*****************************************************************************
1350 * mos7840_write_room
1351 * this function is called by the tty driver when it wants to know how many
1352 * bytes of data we can accept for a specific port.
1353 * If successful, we return the amount of room that we have for this port
1354 * Otherwise we return a negative error number.
1355 *****************************************************************************/
1356
1357 static int mos7840_write_room(struct tty_struct *tty)
1358 {
1359 struct usb_serial_port *port = tty->driver_data;
1360 int i;
1361 int room = 0;
1362 unsigned long flags;
1363 struct moschip_port *mos7840_port;
1364
1365 if (mos7840_port_paranoia_check(port, __func__))
1366 return -1;
1367
1368 mos7840_port = mos7840_get_port_private(port);
1369 if (mos7840_port == NULL)
1370 return -1;
1371
1372 spin_lock_irqsave(&mos7840_port->pool_lock, flags);
1373 for (i = 0; i < NUM_URBS; ++i) {
1374 if (!mos7840_port->busy[i])
1375 room += URB_TRANSFER_BUFFER_SIZE;
1376 }
1377 spin_unlock_irqrestore(&mos7840_port->pool_lock, flags);
1378
1379 room = (room == 0) ? 0 : room - URB_TRANSFER_BUFFER_SIZE + 1;
1380 dev_dbg(&mos7840_port->port->dev, "%s - returns %d\n", __func__, room);
1381 return room;
1382
1383 }
1384
1385 /*****************************************************************************
1386 * mos7840_write
1387 * this function is called by the tty driver when data should be written to
1388 * the port.
1389 * If successful, we return the number of bytes written, otherwise we
1390 * return a negative error number.
1391 *****************************************************************************/
1392
1393 static int mos7840_write(struct tty_struct *tty, struct usb_serial_port *port,
1394 const unsigned char *data, int count)
1395 {
1396 int status;
1397 int i;
1398 int bytes_sent = 0;
1399 int transfer_size;
1400 unsigned long flags;
1401
1402 struct moschip_port *mos7840_port;
1403 struct usb_serial *serial;
1404 struct urb *urb;
1405 /* __u16 Data; */
1406 const unsigned char *current_position = data;
1407 unsigned char *data1;
1408
1409 #ifdef NOTMOS7840
1410 Data = 0x00;
1411 status = mos7840_get_uart_reg(port, LINE_CONTROL_REGISTER, &Data);
1412 mos7840_port->shadowLCR = Data;
1413 dev_dbg(&port->dev, "%s: LINE_CONTROL_REGISTER is %x\n", __func__, Data);
1414 dev_dbg(&port->dev, "%s: mos7840_port->shadowLCR is %x\n", __func__, mos7840_port->shadowLCR);
1415
1416 /* Data = 0x03; */
1417 /* status = mos7840_set_uart_reg(port,LINE_CONTROL_REGISTER,Data); */
1418 /* mos7840_port->shadowLCR=Data;//Need to add later */
1419
1420 Data |= SERIAL_LCR_DLAB; /* data latch enable in LCR 0x80 */
1421 status = mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data);
1422
1423 /* Data = 0x0c; */
1424 /* status = mos7840_set_uart_reg(port,DIVISOR_LATCH_LSB,Data); */
1425 Data = 0x00;
1426 status = mos7840_get_uart_reg(port, DIVISOR_LATCH_LSB, &Data);
1427 dev_dbg(&port->dev, "%s: DLL value is %x\n", __func__, Data);
1428
1429 Data = 0x0;
1430 status = mos7840_get_uart_reg(port, DIVISOR_LATCH_MSB, &Data);
1431 dev_dbg(&port->dev, "%s: DLM value is %x\n", __func__, Data);
1432
1433 Data = Data & ~SERIAL_LCR_DLAB;
1434 dev_dbg(&port->dev, "%s: mos7840_port->shadowLCR is %x\n", __func__, mos7840_port->shadowLCR);
1435 status = mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data);
1436 #endif
1437
1438 if (mos7840_port_paranoia_check(port, __func__))
1439 return -1;
1440
1441 serial = port->serial;
1442 if (mos7840_serial_paranoia_check(serial, __func__))
1443 return -1;
1444
1445 mos7840_port = mos7840_get_port_private(port);
1446 if (mos7840_port == NULL)
1447 return -1;
1448
1449 /* try to find a free urb in the list */
1450 urb = NULL;
1451
1452 spin_lock_irqsave(&mos7840_port->pool_lock, flags);
1453 for (i = 0; i < NUM_URBS; ++i) {
1454 if (!mos7840_port->busy[i]) {
1455 mos7840_port->busy[i] = 1;
1456 urb = mos7840_port->write_urb_pool[i];
1457 dev_dbg(&port->dev, "URB:%d\n", i);
1458 break;
1459 }
1460 }
1461 spin_unlock_irqrestore(&mos7840_port->pool_lock, flags);
1462
1463 if (urb == NULL) {
1464 dev_dbg(&port->dev, "%s - no more free urbs\n", __func__);
1465 goto exit;
1466 }
1467
1468 if (urb->transfer_buffer == NULL) {
1469 urb->transfer_buffer =
1470 kmalloc(URB_TRANSFER_BUFFER_SIZE, GFP_KERNEL);
1471
1472 if (urb->transfer_buffer == NULL) {
1473 dev_err_console(port, "%s no more kernel memory...\n",
1474 __func__);
1475 goto exit;
1476 }
1477 }
1478 transfer_size = min(count, URB_TRANSFER_BUFFER_SIZE);
1479
1480 memcpy(urb->transfer_buffer, current_position, transfer_size);
1481
1482 /* fill urb with data and submit */
1483 if ((serial->num_ports == 2)
1484 && ((((__u16)port->number -
1485 (__u16)(port->serial->minor)) % 2) != 0)) {
1486 usb_fill_bulk_urb(urb,
1487 serial->dev,
1488 usb_sndbulkpipe(serial->dev,
1489 (port->bulk_out_endpointAddress) + 2),
1490 urb->transfer_buffer,
1491 transfer_size,
1492 mos7840_bulk_out_data_callback, mos7840_port);
1493 } else {
1494 usb_fill_bulk_urb(urb,
1495 serial->dev,
1496 usb_sndbulkpipe(serial->dev,
1497 port->bulk_out_endpointAddress),
1498 urb->transfer_buffer,
1499 transfer_size,
1500 mos7840_bulk_out_data_callback, mos7840_port);
1501 }
1502
1503 data1 = urb->transfer_buffer;
1504 dev_dbg(&port->dev, "bulkout endpoint is %d\n", port->bulk_out_endpointAddress);
1505
1506 /* Turn on LED */
1507 if (mos7840_port->has_led && !mos7840_port->led_flag) {
1508 mos7840_port->led_flag = true;
1509 mos7840_set_led_sync(port, MODEM_CONTROL_REGISTER, 0x0301);
1510 mod_timer(&mos7840_port->led_timer1,
1511 jiffies + msecs_to_jiffies(LED_ON_MS));
1512 }
1513
1514 /* send it down the pipe */
1515 status = usb_submit_urb(urb, GFP_ATOMIC);
1516
1517 if (status) {
1518 mos7840_port->busy[i] = 0;
1519 dev_err_console(port, "%s - usb_submit_urb(write bulk) failed "
1520 "with status = %d\n", __func__, status);
1521 bytes_sent = status;
1522 goto exit;
1523 }
1524 bytes_sent = transfer_size;
1525 mos7840_port->icount.tx += transfer_size;
1526 smp_wmb();
1527 dev_dbg(&port->dev, "mos7840_port->icount.tx is %d:\n", mos7840_port->icount.tx);
1528 exit:
1529 return bytes_sent;
1530
1531 }
1532
1533 /*****************************************************************************
1534 * mos7840_throttle
1535 * this function is called by the tty driver when it wants to stop the data
1536 * being read from the port.
1537 *****************************************************************************/
1538
1539 static void mos7840_throttle(struct tty_struct *tty)
1540 {
1541 struct usb_serial_port *port = tty->driver_data;
1542 struct moschip_port *mos7840_port;
1543 int status;
1544
1545 if (mos7840_port_paranoia_check(port, __func__))
1546 return;
1547
1548 mos7840_port = mos7840_get_port_private(port);
1549
1550 if (mos7840_port == NULL)
1551 return;
1552
1553 if (!mos7840_port->open) {
1554 dev_dbg(&port->dev, "%s", "port not opened\n");
1555 return;
1556 }
1557
1558 /* if we are implementing XON/XOFF, send the stop character */
1559 if (I_IXOFF(tty)) {
1560 unsigned char stop_char = STOP_CHAR(tty);
1561 status = mos7840_write(tty, port, &stop_char, 1);
1562 if (status <= 0)
1563 return;
1564 }
1565 /* if we are implementing RTS/CTS, toggle that line */
1566 if (tty->termios.c_cflag & CRTSCTS) {
1567 mos7840_port->shadowMCR &= ~MCR_RTS;
1568 status = mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER,
1569 mos7840_port->shadowMCR);
1570 if (status < 0)
1571 return;
1572 }
1573 }
1574
1575 /*****************************************************************************
1576 * mos7840_unthrottle
1577 * this function is called by the tty driver when it wants to resume
1578 * the data being read from the port (called after mos7840_throttle is
1579 * called)
1580 *****************************************************************************/
1581 static void mos7840_unthrottle(struct tty_struct *tty)
1582 {
1583 struct usb_serial_port *port = tty->driver_data;
1584 int status;
1585 struct moschip_port *mos7840_port = mos7840_get_port_private(port);
1586
1587 if (mos7840_port_paranoia_check(port, __func__))
1588 return;
1589
1590 if (mos7840_port == NULL)
1591 return;
1592
1593 if (!mos7840_port->open) {
1594 dev_dbg(&port->dev, "%s - port not opened\n", __func__);
1595 return;
1596 }
1597
1598 /* if we are implementing XON/XOFF, send the start character */
1599 if (I_IXOFF(tty)) {
1600 unsigned char start_char = START_CHAR(tty);
1601 status = mos7840_write(tty, port, &start_char, 1);
1602 if (status <= 0)
1603 return;
1604 }
1605
1606 /* if we are implementing RTS/CTS, toggle that line */
1607 if (tty->termios.c_cflag & CRTSCTS) {
1608 mos7840_port->shadowMCR |= MCR_RTS;
1609 status = mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER,
1610 mos7840_port->shadowMCR);
1611 if (status < 0)
1612 return;
1613 }
1614 }
1615
1616 static int mos7840_tiocmget(struct tty_struct *tty)
1617 {
1618 struct usb_serial_port *port = tty->driver_data;
1619 struct moschip_port *mos7840_port;
1620 unsigned int result;
1621 __u16 msr;
1622 __u16 mcr;
1623 int status;
1624 mos7840_port = mos7840_get_port_private(port);
1625
1626 if (mos7840_port == NULL)
1627 return -ENODEV;
1628
1629 status = mos7840_get_uart_reg(port, MODEM_STATUS_REGISTER, &msr);
1630 status = mos7840_get_uart_reg(port, MODEM_CONTROL_REGISTER, &mcr);
1631 result = ((mcr & MCR_DTR) ? TIOCM_DTR : 0)
1632 | ((mcr & MCR_RTS) ? TIOCM_RTS : 0)
1633 | ((mcr & MCR_LOOPBACK) ? TIOCM_LOOP : 0)
1634 | ((msr & MOS7840_MSR_CTS) ? TIOCM_CTS : 0)
1635 | ((msr & MOS7840_MSR_CD) ? TIOCM_CAR : 0)
1636 | ((msr & MOS7840_MSR_RI) ? TIOCM_RI : 0)
1637 | ((msr & MOS7840_MSR_DSR) ? TIOCM_DSR : 0);
1638
1639 dev_dbg(&port->dev, "%s - 0x%04X\n", __func__, result);
1640
1641 return result;
1642 }
1643
1644 static int mos7840_tiocmset(struct tty_struct *tty,
1645 unsigned int set, unsigned int clear)
1646 {
1647 struct usb_serial_port *port = tty->driver_data;
1648 struct moschip_port *mos7840_port;
1649 unsigned int mcr;
1650 int status;
1651
1652 mos7840_port = mos7840_get_port_private(port);
1653
1654 if (mos7840_port == NULL)
1655 return -ENODEV;
1656
1657 /* FIXME: What locks the port registers ? */
1658 mcr = mos7840_port->shadowMCR;
1659 if (clear & TIOCM_RTS)
1660 mcr &= ~MCR_RTS;
1661 if (clear & TIOCM_DTR)
1662 mcr &= ~MCR_DTR;
1663 if (clear & TIOCM_LOOP)
1664 mcr &= ~MCR_LOOPBACK;
1665
1666 if (set & TIOCM_RTS)
1667 mcr |= MCR_RTS;
1668 if (set & TIOCM_DTR)
1669 mcr |= MCR_DTR;
1670 if (set & TIOCM_LOOP)
1671 mcr |= MCR_LOOPBACK;
1672
1673 mos7840_port->shadowMCR = mcr;
1674
1675 status = mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER, mcr);
1676 if (status < 0) {
1677 dev_dbg(&port->dev, "setting MODEM_CONTROL_REGISTER Failed\n");
1678 return status;
1679 }
1680
1681 return 0;
1682 }
1683
1684 /*****************************************************************************
1685 * mos7840_calc_baud_rate_divisor
1686 * this function calculates the proper baud rate divisor for the specified
1687 * baud rate.
1688 *****************************************************************************/
1689 static int mos7840_calc_baud_rate_divisor(struct usb_serial_port *port,
1690 int baudRate, int *divisor,
1691 __u16 *clk_sel_val)
1692 {
1693 dev_dbg(&port->dev, "%s - %d\n", __func__, baudRate);
1694
1695 if (baudRate <= 115200) {
1696 *divisor = 115200 / baudRate;
1697 *clk_sel_val = 0x0;
1698 }
1699 if ((baudRate > 115200) && (baudRate <= 230400)) {
1700 *divisor = 230400 / baudRate;
1701 *clk_sel_val = 0x10;
1702 } else if ((baudRate > 230400) && (baudRate <= 403200)) {
1703 *divisor = 403200 / baudRate;
1704 *clk_sel_val = 0x20;
1705 } else if ((baudRate > 403200) && (baudRate <= 460800)) {
1706 *divisor = 460800 / baudRate;
1707 *clk_sel_val = 0x30;
1708 } else if ((baudRate > 460800) && (baudRate <= 806400)) {
1709 *divisor = 806400 / baudRate;
1710 *clk_sel_val = 0x40;
1711 } else if ((baudRate > 806400) && (baudRate <= 921600)) {
1712 *divisor = 921600 / baudRate;
1713 *clk_sel_val = 0x50;
1714 } else if ((baudRate > 921600) && (baudRate <= 1572864)) {
1715 *divisor = 1572864 / baudRate;
1716 *clk_sel_val = 0x60;
1717 } else if ((baudRate > 1572864) && (baudRate <= 3145728)) {
1718 *divisor = 3145728 / baudRate;
1719 *clk_sel_val = 0x70;
1720 }
1721 return 0;
1722
1723 #ifdef NOTMCS7840
1724
1725 for (i = 0; i < ARRAY_SIZE(mos7840_divisor_table); i++) {
1726 if (mos7840_divisor_table[i].BaudRate == baudrate) {
1727 *divisor = mos7840_divisor_table[i].Divisor;
1728 return 0;
1729 }
1730 }
1731
1732 /* After trying for all the standard baud rates *
1733 * Try calculating the divisor for this baud rate */
1734
1735 if (baudrate > 75 && baudrate < 230400) {
1736 /* get the divisor */
1737 custom = (__u16) (230400L / baudrate);
1738
1739 /* Check for round off */
1740 round1 = (__u16) (2304000L / baudrate);
1741 round = (__u16) (round1 - (custom * 10));
1742 if (round > 4)
1743 custom++;
1744 *divisor = custom;
1745
1746 dev_dbg(&port->dev, " Baud %d = %d\n", baudrate, custom);
1747 return 0;
1748 }
1749
1750 dev_dbg(&port->dev, "%s", " Baud calculation Failed...\n");
1751 return -1;
1752 #endif
1753 }
1754
1755 /*****************************************************************************
1756 * mos7840_send_cmd_write_baud_rate
1757 * this function sends the proper command to change the baud rate of the
1758 * specified port.
1759 *****************************************************************************/
1760
1761 static int mos7840_send_cmd_write_baud_rate(struct moschip_port *mos7840_port,
1762 int baudRate)
1763 {
1764 int divisor = 0;
1765 int status;
1766 __u16 Data;
1767 unsigned char number;
1768 __u16 clk_sel_val;
1769 struct usb_serial_port *port;
1770
1771 if (mos7840_port == NULL)
1772 return -1;
1773
1774 port = mos7840_port->port;
1775 if (mos7840_port_paranoia_check(port, __func__))
1776 return -1;
1777
1778 if (mos7840_serial_paranoia_check(port->serial, __func__))
1779 return -1;
1780
1781 number = mos7840_port->port->number - mos7840_port->port->serial->minor;
1782
1783 dev_dbg(&port->dev, "%s - port = %d, baud = %d\n", __func__,
1784 mos7840_port->port->number, baudRate);
1785 /* reset clk_uart_sel in spregOffset */
1786 if (baudRate > 115200) {
1787 #ifdef HW_flow_control
1788 /* NOTE: need to see the pther register to modify */
1789 /* setting h/w flow control bit to 1 */
1790 Data = 0x2b;
1791 mos7840_port->shadowMCR = Data;
1792 status = mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER,
1793 Data);
1794 if (status < 0) {
1795 dev_dbg(&port->dev, "Writing spreg failed in set_serial_baud\n");
1796 return -1;
1797 }
1798 #endif
1799
1800 } else {
1801 #ifdef HW_flow_control
1802 /* setting h/w flow control bit to 0 */
1803 Data = 0xb;
1804 mos7840_port->shadowMCR = Data;
1805 status = mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER,
1806 Data);
1807 if (status < 0) {
1808 dev_dbg(&port->dev, "Writing spreg failed in set_serial_baud\n");
1809 return -1;
1810 }
1811 #endif
1812
1813 }
1814
1815 if (1) { /* baudRate <= 115200) */
1816 clk_sel_val = 0x0;
1817 Data = 0x0;
1818 status = mos7840_calc_baud_rate_divisor(port, baudRate, &divisor,
1819 &clk_sel_val);
1820 status = mos7840_get_reg_sync(port, mos7840_port->SpRegOffset,
1821 &Data);
1822 if (status < 0) {
1823 dev_dbg(&port->dev, "reading spreg failed in set_serial_baud\n");
1824 return -1;
1825 }
1826 Data = (Data & 0x8f) | clk_sel_val;
1827 status = mos7840_set_reg_sync(port, mos7840_port->SpRegOffset,
1828 Data);
1829 if (status < 0) {
1830 dev_dbg(&port->dev, "Writing spreg failed in set_serial_baud\n");
1831 return -1;
1832 }
1833 /* Calculate the Divisor */
1834
1835 if (status) {
1836 dev_err(&port->dev, "%s - bad baud rate\n", __func__);
1837 return status;
1838 }
1839 /* Enable access to divisor latch */
1840 Data = mos7840_port->shadowLCR | SERIAL_LCR_DLAB;
1841 mos7840_port->shadowLCR = Data;
1842 mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data);
1843
1844 /* Write the divisor */
1845 Data = (unsigned char)(divisor & 0xff);
1846 dev_dbg(&port->dev, "set_serial_baud Value to write DLL is %x\n", Data);
1847 mos7840_set_uart_reg(port, DIVISOR_LATCH_LSB, Data);
1848
1849 Data = (unsigned char)((divisor & 0xff00) >> 8);
1850 dev_dbg(&port->dev, "set_serial_baud Value to write DLM is %x\n", Data);
1851 mos7840_set_uart_reg(port, DIVISOR_LATCH_MSB, Data);
1852
1853 /* Disable access to divisor latch */
1854 Data = mos7840_port->shadowLCR & ~SERIAL_LCR_DLAB;
1855 mos7840_port->shadowLCR = Data;
1856 mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data);
1857
1858 }
1859 return status;
1860 }
1861
1862 /*****************************************************************************
1863 * mos7840_change_port_settings
1864 * This routine is called to set the UART on the device to match
1865 * the specified new settings.
1866 *****************************************************************************/
1867
1868 static void mos7840_change_port_settings(struct tty_struct *tty,
1869 struct moschip_port *mos7840_port, struct ktermios *old_termios)
1870 {
1871 int baud;
1872 unsigned cflag;
1873 unsigned iflag;
1874 __u8 lData;
1875 __u8 lParity;
1876 __u8 lStop;
1877 int status;
1878 __u16 Data;
1879 struct usb_serial_port *port;
1880 struct usb_serial *serial;
1881
1882 if (mos7840_port == NULL)
1883 return;
1884
1885 port = mos7840_port->port;
1886
1887 if (mos7840_port_paranoia_check(port, __func__))
1888 return;
1889
1890 if (mos7840_serial_paranoia_check(port->serial, __func__))
1891 return;
1892
1893 serial = port->serial;
1894
1895 if (!mos7840_port->open) {
1896 dev_dbg(&port->dev, "%s - port not opened\n", __func__);
1897 return;
1898 }
1899
1900 lData = LCR_BITS_8;
1901 lStop = LCR_STOP_1;
1902 lParity = LCR_PAR_NONE;
1903
1904 cflag = tty->termios.c_cflag;
1905 iflag = tty->termios.c_iflag;
1906
1907 /* Change the number of bits */
1908 if (cflag & CSIZE) {
1909 switch (cflag & CSIZE) {
1910 case CS5:
1911 lData = LCR_BITS_5;
1912 break;
1913
1914 case CS6:
1915 lData = LCR_BITS_6;
1916 break;
1917
1918 case CS7:
1919 lData = LCR_BITS_7;
1920 break;
1921 default:
1922 case CS8:
1923 lData = LCR_BITS_8;
1924 break;
1925 }
1926 }
1927 /* Change the Parity bit */
1928 if (cflag & PARENB) {
1929 if (cflag & PARODD) {
1930 lParity = LCR_PAR_ODD;
1931 dev_dbg(&port->dev, "%s - parity = odd\n", __func__);
1932 } else {
1933 lParity = LCR_PAR_EVEN;
1934 dev_dbg(&port->dev, "%s - parity = even\n", __func__);
1935 }
1936
1937 } else {
1938 dev_dbg(&port->dev, "%s - parity = none\n", __func__);
1939 }
1940
1941 if (cflag & CMSPAR)
1942 lParity = lParity | 0x20;
1943
1944 /* Change the Stop bit */
1945 if (cflag & CSTOPB) {
1946 lStop = LCR_STOP_2;
1947 dev_dbg(&port->dev, "%s - stop bits = 2\n", __func__);
1948 } else {
1949 lStop = LCR_STOP_1;
1950 dev_dbg(&port->dev, "%s - stop bits = 1\n", __func__);
1951 }
1952
1953 /* Update the LCR with the correct value */
1954 mos7840_port->shadowLCR &=
1955 ~(LCR_BITS_MASK | LCR_STOP_MASK | LCR_PAR_MASK);
1956 mos7840_port->shadowLCR |= (lData | lParity | lStop);
1957
1958 dev_dbg(&port->dev, "%s - mos7840_port->shadowLCR is %x\n", __func__,
1959 mos7840_port->shadowLCR);
1960 /* Disable Interrupts */
1961 Data = 0x00;
1962 mos7840_set_uart_reg(port, INTERRUPT_ENABLE_REGISTER, Data);
1963
1964 Data = 0x00;
1965 mos7840_set_uart_reg(port, FIFO_CONTROL_REGISTER, Data);
1966
1967 Data = 0xcf;
1968 mos7840_set_uart_reg(port, FIFO_CONTROL_REGISTER, Data);
1969
1970 /* Send the updated LCR value to the mos7840 */
1971 Data = mos7840_port->shadowLCR;
1972
1973 mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data);
1974
1975 Data = 0x00b;
1976 mos7840_port->shadowMCR = Data;
1977 mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER, Data);
1978 Data = 0x00b;
1979 mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER, Data);
1980
1981 /* set up the MCR register and send it to the mos7840 */
1982
1983 mos7840_port->shadowMCR = MCR_MASTER_IE;
1984 if (cflag & CBAUD)
1985 mos7840_port->shadowMCR |= (MCR_DTR | MCR_RTS);
1986
1987 if (cflag & CRTSCTS)
1988 mos7840_port->shadowMCR |= (MCR_XON_ANY);
1989 else
1990 mos7840_port->shadowMCR &= ~(MCR_XON_ANY);
1991
1992 Data = mos7840_port->shadowMCR;
1993 mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER, Data);
1994
1995 /* Determine divisor based on baud rate */
1996 baud = tty_get_baud_rate(tty);
1997
1998 if (!baud) {
1999 /* pick a default, any default... */
2000 dev_dbg(&port->dev, "%s", "Picked default baud...\n");
2001 baud = 9600;
2002 }
2003
2004 dev_dbg(&port->dev, "%s - baud rate = %d\n", __func__, baud);
2005 status = mos7840_send_cmd_write_baud_rate(mos7840_port, baud);
2006
2007 /* Enable Interrupts */
2008 Data = 0x0c;
2009 mos7840_set_uart_reg(port, INTERRUPT_ENABLE_REGISTER, Data);
2010
2011 if (mos7840_port->read_urb_busy == false) {
2012 mos7840_port->read_urb_busy = true;
2013 status = usb_submit_urb(mos7840_port->read_urb, GFP_ATOMIC);
2014 if (status) {
2015 dev_dbg(&port->dev, "usb_submit_urb(read bulk) failed, status = %d\n",
2016 status);
2017 mos7840_port->read_urb_busy = false;
2018 }
2019 }
2020 wake_up(&mos7840_port->delta_msr_wait);
2021 mos7840_port->delta_msr_cond = 1;
2022 dev_dbg(&port->dev, "%s - mos7840_port->shadowLCR is End %x\n", __func__,
2023 mos7840_port->shadowLCR);
2024 }
2025
2026 /*****************************************************************************
2027 * mos7840_set_termios
2028 * this function is called by the tty driver when it wants to change
2029 * the termios structure
2030 *****************************************************************************/
2031
2032 static void mos7840_set_termios(struct tty_struct *tty,
2033 struct usb_serial_port *port,
2034 struct ktermios *old_termios)
2035 {
2036 int status;
2037 unsigned int cflag;
2038 struct usb_serial *serial;
2039 struct moschip_port *mos7840_port;
2040
2041 if (mos7840_port_paranoia_check(port, __func__))
2042 return;
2043
2044 serial = port->serial;
2045
2046 if (mos7840_serial_paranoia_check(serial, __func__))
2047 return;
2048
2049 mos7840_port = mos7840_get_port_private(port);
2050
2051 if (mos7840_port == NULL)
2052 return;
2053
2054 if (!mos7840_port->open) {
2055 dev_dbg(&port->dev, "%s - port not opened\n", __func__);
2056 return;
2057 }
2058
2059 dev_dbg(&port->dev, "%s", "setting termios - \n");
2060
2061 cflag = tty->termios.c_cflag;
2062
2063 dev_dbg(&port->dev, "%s - clfag %08x iflag %08x\n", __func__,
2064 tty->termios.c_cflag, RELEVANT_IFLAG(tty->termios.c_iflag));
2065 dev_dbg(&port->dev, "%s - old clfag %08x old iflag %08x\n", __func__,
2066 old_termios->c_cflag, RELEVANT_IFLAG(old_termios->c_iflag));
2067 dev_dbg(&port->dev, "%s - port %d\n", __func__, port->number);
2068
2069 /* change the port settings to the new ones specified */
2070
2071 mos7840_change_port_settings(tty, mos7840_port, old_termios);
2072
2073 if (!mos7840_port->read_urb) {
2074 dev_dbg(&port->dev, "%s", "URB KILLED !!!!!\n");
2075 return;
2076 }
2077
2078 if (mos7840_port->read_urb_busy == false) {
2079 mos7840_port->read_urb_busy = true;
2080 status = usb_submit_urb(mos7840_port->read_urb, GFP_ATOMIC);
2081 if (status) {
2082 dev_dbg(&port->dev, "usb_submit_urb(read bulk) failed, status = %d\n",
2083 status);
2084 mos7840_port->read_urb_busy = false;
2085 }
2086 }
2087 }
2088
2089 /*****************************************************************************
2090 * mos7840_get_lsr_info - get line status register info
2091 *
2092 * Purpose: Let user call ioctl() to get info when the UART physically
2093 * is emptied. On bus types like RS485, the transmitter must
2094 * release the bus after transmitting. This must be done when
2095 * the transmit shift register is empty, not be done when the
2096 * transmit holding register is empty. This functionality
2097 * allows an RS485 driver to be written in user space.
2098 *****************************************************************************/
2099
2100 static int mos7840_get_lsr_info(struct tty_struct *tty,
2101 unsigned int __user *value)
2102 {
2103 int count;
2104 unsigned int result = 0;
2105
2106 count = mos7840_chars_in_buffer(tty);
2107 if (count == 0)
2108 result = TIOCSER_TEMT;
2109
2110 if (copy_to_user(value, &result, sizeof(int)))
2111 return -EFAULT;
2112 return 0;
2113 }
2114
2115 /*****************************************************************************
2116 * mos7840_get_serial_info
2117 * function to get information about serial port
2118 *****************************************************************************/
2119
2120 static int mos7840_get_serial_info(struct moschip_port *mos7840_port,
2121 struct serial_struct __user *retinfo)
2122 {
2123 struct serial_struct tmp;
2124
2125 if (mos7840_port == NULL)
2126 return -1;
2127
2128 if (!retinfo)
2129 return -EFAULT;
2130
2131 memset(&tmp, 0, sizeof(tmp));
2132
2133 tmp.type = PORT_16550A;
2134 tmp.line = mos7840_port->port->serial->minor;
2135 tmp.port = mos7840_port->port->number;
2136 tmp.irq = 0;
2137 tmp.flags = ASYNC_SKIP_TEST | ASYNC_AUTO_IRQ;
2138 tmp.xmit_fifo_size = NUM_URBS * URB_TRANSFER_BUFFER_SIZE;
2139 tmp.baud_base = 9600;
2140 tmp.close_delay = 5 * HZ;
2141 tmp.closing_wait = 30 * HZ;
2142
2143 if (copy_to_user(retinfo, &tmp, sizeof(*retinfo)))
2144 return -EFAULT;
2145 return 0;
2146 }
2147
2148 static int mos7840_get_icount(struct tty_struct *tty,
2149 struct serial_icounter_struct *icount)
2150 {
2151 struct usb_serial_port *port = tty->driver_data;
2152 struct moschip_port *mos7840_port;
2153 struct async_icount cnow;
2154
2155 mos7840_port = mos7840_get_port_private(port);
2156 cnow = mos7840_port->icount;
2157
2158 smp_rmb();
2159 icount->cts = cnow.cts;
2160 icount->dsr = cnow.dsr;
2161 icount->rng = cnow.rng;
2162 icount->dcd = cnow.dcd;
2163 icount->rx = cnow.rx;
2164 icount->tx = cnow.tx;
2165 icount->frame = cnow.frame;
2166 icount->overrun = cnow.overrun;
2167 icount->parity = cnow.parity;
2168 icount->brk = cnow.brk;
2169 icount->buf_overrun = cnow.buf_overrun;
2170
2171 dev_dbg(&port->dev, "%s TIOCGICOUNT RX=%d, TX=%d\n", __func__,
2172 icount->rx, icount->tx);
2173 return 0;
2174 }
2175
2176 /*****************************************************************************
2177 * SerialIoctl
2178 * this function handles any ioctl calls to the driver
2179 *****************************************************************************/
2180
2181 static int mos7840_ioctl(struct tty_struct *tty,
2182 unsigned int cmd, unsigned long arg)
2183 {
2184 struct usb_serial_port *port = tty->driver_data;
2185 void __user *argp = (void __user *)arg;
2186 struct moschip_port *mos7840_port;
2187
2188 struct async_icount cnow;
2189 struct async_icount cprev;
2190
2191 if (mos7840_port_paranoia_check(port, __func__))
2192 return -1;
2193
2194 mos7840_port = mos7840_get_port_private(port);
2195
2196 if (mos7840_port == NULL)
2197 return -1;
2198
2199 dev_dbg(&port->dev, "%s - cmd = 0x%x\n", __func__, cmd);
2200
2201 switch (cmd) {
2202 /* return number of bytes available */
2203
2204 case TIOCSERGETLSR:
2205 dev_dbg(&port->dev, "%s TIOCSERGETLSR\n", __func__);
2206 return mos7840_get_lsr_info(tty, argp);
2207
2208 case TIOCGSERIAL:
2209 dev_dbg(&port->dev, "%s TIOCGSERIAL\n", __func__);
2210 return mos7840_get_serial_info(mos7840_port, argp);
2211
2212 case TIOCSSERIAL:
2213 dev_dbg(&port->dev, "%s TIOCSSERIAL\n", __func__);
2214 break;
2215
2216 case TIOCMIWAIT:
2217 dev_dbg(&port->dev, "%s TIOCMIWAIT\n", __func__);
2218 cprev = mos7840_port->icount;
2219 while (1) {
2220 /* interruptible_sleep_on(&mos7840_port->delta_msr_wait); */
2221 mos7840_port->delta_msr_cond = 0;
2222 wait_event_interruptible(mos7840_port->delta_msr_wait,
2223 (mos7840_port->
2224 delta_msr_cond == 1));
2225
2226 /* see if a signal did it */
2227 if (signal_pending(current))
2228 return -ERESTARTSYS;
2229 cnow = mos7840_port->icount;
2230 smp_rmb();
2231 if (cnow.rng == cprev.rng && cnow.dsr == cprev.dsr &&
2232 cnow.dcd == cprev.dcd && cnow.cts == cprev.cts)
2233 return -EIO; /* no change => error */
2234 if (((arg & TIOCM_RNG) && (cnow.rng != cprev.rng)) ||
2235 ((arg & TIOCM_DSR) && (cnow.dsr != cprev.dsr)) ||
2236 ((arg & TIOCM_CD) && (cnow.dcd != cprev.dcd)) ||
2237 ((arg & TIOCM_CTS) && (cnow.cts != cprev.cts))) {
2238 return 0;
2239 }
2240 cprev = cnow;
2241 }
2242 /* NOTREACHED */
2243 break;
2244
2245 default:
2246 break;
2247 }
2248 return -ENOIOCTLCMD;
2249 }
2250
2251 static int mos7810_check(struct usb_serial *serial)
2252 {
2253 int i, pass_count = 0;
2254 __u16 data = 0, mcr_data = 0;
2255 __u16 test_pattern = 0x55AA;
2256
2257 /* Store MCR setting */
2258 usb_control_msg(serial->dev, usb_rcvctrlpipe(serial->dev, 0),
2259 MCS_RDREQ, MCS_RD_RTYPE, 0x0300, MODEM_CONTROL_REGISTER,
2260 &mcr_data, VENDOR_READ_LENGTH, MOS_WDR_TIMEOUT);
2261
2262 for (i = 0; i < 16; i++) {
2263 /* Send the 1-bit test pattern out to MCS7810 test pin */
2264 usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0),
2265 MCS_WRREQ, MCS_WR_RTYPE,
2266 (0x0300 | (((test_pattern >> i) & 0x0001) << 1)),
2267 MODEM_CONTROL_REGISTER, NULL, 0, MOS_WDR_TIMEOUT);
2268
2269 /* Read the test pattern back */
2270 usb_control_msg(serial->dev, usb_rcvctrlpipe(serial->dev, 0),
2271 MCS_RDREQ, MCS_RD_RTYPE, 0, GPIO_REGISTER, &data,
2272 VENDOR_READ_LENGTH, MOS_WDR_TIMEOUT);
2273
2274 /* If this is a MCS7810 device, both test patterns must match */
2275 if (((test_pattern >> i) ^ (~data >> 1)) & 0x0001)
2276 break;
2277
2278 pass_count++;
2279 }
2280
2281 /* Restore MCR setting */
2282 usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0), MCS_WRREQ,
2283 MCS_WR_RTYPE, 0x0300 | mcr_data, MODEM_CONTROL_REGISTER, NULL,
2284 0, MOS_WDR_TIMEOUT);
2285
2286 if (pass_count == 16)
2287 return 1;
2288
2289 return 0;
2290 }
2291
2292 static int mos7840_calc_num_ports(struct usb_serial *serial)
2293 {
2294 __u16 data = 0x00;
2295 int mos7840_num_ports;
2296
2297 usb_control_msg(serial->dev, usb_rcvctrlpipe(serial->dev, 0),
2298 MCS_RDREQ, MCS_RD_RTYPE, 0, GPIO_REGISTER, &data,
2299 VENDOR_READ_LENGTH, MOS_WDR_TIMEOUT);
2300
2301 if (serial->dev->descriptor.idProduct == MOSCHIP_DEVICE_ID_7810 ||
2302 serial->dev->descriptor.idProduct == MOSCHIP_DEVICE_ID_7820) {
2303 device_type = serial->dev->descriptor.idProduct;
2304 } else {
2305 /* For a MCS7840 device GPIO0 must be set to 1 */
2306 if ((data & 0x01) == 1)
2307 device_type = MOSCHIP_DEVICE_ID_7840;
2308 else if (mos7810_check(serial))
2309 device_type = MOSCHIP_DEVICE_ID_7810;
2310 else
2311 device_type = MOSCHIP_DEVICE_ID_7820;
2312 }
2313
2314 mos7840_num_ports = (device_type >> 4) & 0x000F;
2315 serial->num_bulk_in = mos7840_num_ports;
2316 serial->num_bulk_out = mos7840_num_ports;
2317 serial->num_ports = mos7840_num_ports;
2318
2319 return mos7840_num_ports;
2320 }
2321
2322 static int mos7840_port_probe(struct usb_serial_port *port)
2323 {
2324 struct usb_serial *serial = port->serial;
2325 struct moschip_port *mos7840_port;
2326 int status;
2327 int pnum;
2328 __u16 Data;
2329
2330 /* we set up the pointers to the endpoints in the mos7840_open *
2331 * function, as the structures aren't created yet. */
2332
2333 pnum = port->number - serial->minor;
2334
2335 dev_dbg(&port->dev, "mos7840_startup: configuring port %d\n", pnum);
2336 mos7840_port = kzalloc(sizeof(struct moschip_port), GFP_KERNEL);
2337 if (mos7840_port == NULL) {
2338 dev_err(&port->dev, "%s - Out of memory\n", __func__);
2339 return -ENOMEM;
2340 }
2341
2342 /* Initialize all port interrupt end point to port 0 int
2343 * endpoint. Our device has only one interrupt end point
2344 * common to all port */
2345
2346 mos7840_port->port = port;
2347 mos7840_set_port_private(port, mos7840_port);
2348 spin_lock_init(&mos7840_port->pool_lock);
2349
2350 /* minor is not initialised until later by
2351 * usb-serial.c:get_free_serial() and cannot therefore be used
2352 * to index device instances */
2353 mos7840_port->port_num = pnum + 1;
2354 dev_dbg(&port->dev, "port->number = %d\n", port->number);
2355 dev_dbg(&port->dev, "port->serial->minor = %d\n", port->serial->minor);
2356 dev_dbg(&port->dev, "mos7840_port->port_num = %d\n", mos7840_port->port_num);
2357 dev_dbg(&port->dev, "serial->minor = %d\n", serial->minor);
2358
2359 if (mos7840_port->port_num == 1) {
2360 mos7840_port->SpRegOffset = 0x0;
2361 mos7840_port->ControlRegOffset = 0x1;
2362 mos7840_port->DcrRegOffset = 0x4;
2363 } else if ((mos7840_port->port_num == 2) && (serial->num_ports == 4)) {
2364 mos7840_port->SpRegOffset = 0x8;
2365 mos7840_port->ControlRegOffset = 0x9;
2366 mos7840_port->DcrRegOffset = 0x16;
2367 } else if ((mos7840_port->port_num == 2) && (serial->num_ports == 2)) {
2368 mos7840_port->SpRegOffset = 0xa;
2369 mos7840_port->ControlRegOffset = 0xb;
2370 mos7840_port->DcrRegOffset = 0x19;
2371 } else if ((mos7840_port->port_num == 3) && (serial->num_ports == 4)) {
2372 mos7840_port->SpRegOffset = 0xa;
2373 mos7840_port->ControlRegOffset = 0xb;
2374 mos7840_port->DcrRegOffset = 0x19;
2375 } else if ((mos7840_port->port_num == 4) && (serial->num_ports == 4)) {
2376 mos7840_port->SpRegOffset = 0xc;
2377 mos7840_port->ControlRegOffset = 0xd;
2378 mos7840_port->DcrRegOffset = 0x1c;
2379 }
2380 mos7840_dump_serial_port(port, mos7840_port);
2381 mos7840_set_port_private(port, mos7840_port);
2382
2383 /* enable rx_disable bit in control register */
2384 status = mos7840_get_reg_sync(port,
2385 mos7840_port->ControlRegOffset, &Data);
2386 if (status < 0) {
2387 dev_dbg(&port->dev, "Reading ControlReg failed status-0x%x\n", status);
2388 goto out;
2389 } else
2390 dev_dbg(&port->dev, "ControlReg Reading success val is %x, status%d\n", Data, status);
2391 Data |= 0x08; /* setting driver done bit */
2392 Data |= 0x04; /* sp1_bit to have cts change reflect in
2393 modem status reg */
2394
2395 /* Data |= 0x20; //rx_disable bit */
2396 status = mos7840_set_reg_sync(port,
2397 mos7840_port->ControlRegOffset, Data);
2398 if (status < 0) {
2399 dev_dbg(&port->dev, "Writing ControlReg failed(rx_disable) status-0x%x\n", status);
2400 goto out;
2401 } else
2402 dev_dbg(&port->dev, "ControlReg Writing success(rx_disable) status%d\n", status);
2403
2404 /* Write default values in DCR (i.e 0x01 in DCR0, 0x05 in DCR2
2405 and 0x24 in DCR3 */
2406 Data = 0x01;
2407 status = mos7840_set_reg_sync(port,
2408 (__u16) (mos7840_port->DcrRegOffset + 0), Data);
2409 if (status < 0) {
2410 dev_dbg(&port->dev, "Writing DCR0 failed status-0x%x\n", status);
2411 goto out;
2412 } else
2413 dev_dbg(&port->dev, "DCR0 Writing success status%d\n", status);
2414
2415 Data = 0x05;
2416 status = mos7840_set_reg_sync(port,
2417 (__u16) (mos7840_port->DcrRegOffset + 1), Data);
2418 if (status < 0) {
2419 dev_dbg(&port->dev, "Writing DCR1 failed status-0x%x\n", status);
2420 goto out;
2421 } else
2422 dev_dbg(&port->dev, "DCR1 Writing success status%d\n", status);
2423
2424 Data = 0x24;
2425 status = mos7840_set_reg_sync(port,
2426 (__u16) (mos7840_port->DcrRegOffset + 2), Data);
2427 if (status < 0) {
2428 dev_dbg(&port->dev, "Writing DCR2 failed status-0x%x\n", status);
2429 goto out;
2430 } else
2431 dev_dbg(&port->dev, "DCR2 Writing success status%d\n", status);
2432
2433 /* write values in clkstart0x0 and clkmulti 0x20 */
2434 Data = 0x0;
2435 status = mos7840_set_reg_sync(port, CLK_START_VALUE_REGISTER, Data);
2436 if (status < 0) {
2437 dev_dbg(&port->dev, "Writing CLK_START_VALUE_REGISTER failed status-0x%x\n", status);
2438 goto out;
2439 } else
2440 dev_dbg(&port->dev, "CLK_START_VALUE_REGISTER Writing success status%d\n", status);
2441
2442 Data = 0x20;
2443 status = mos7840_set_reg_sync(port, CLK_MULTI_REGISTER, Data);
2444 if (status < 0) {
2445 dev_dbg(&port->dev, "Writing CLK_MULTI_REGISTER failed status-0x%x\n", status);
2446 goto error;
2447 } else
2448 dev_dbg(&port->dev, "CLK_MULTI_REGISTER Writing success status%d\n", status);
2449
2450 /* write value 0x0 to scratchpad register */
2451 Data = 0x00;
2452 status = mos7840_set_uart_reg(port, SCRATCH_PAD_REGISTER, Data);
2453 if (status < 0) {
2454 dev_dbg(&port->dev, "Writing SCRATCH_PAD_REGISTER failed status-0x%x\n", status);
2455 goto out;
2456 } else
2457 dev_dbg(&port->dev, "SCRATCH_PAD_REGISTER Writing success status%d\n", status);
2458
2459 /* Zero Length flag register */
2460 if ((mos7840_port->port_num != 1) && (serial->num_ports == 2)) {
2461 Data = 0xff;
2462 status = mos7840_set_reg_sync(port,
2463 (__u16) (ZLP_REG1 +
2464 ((__u16)mos7840_port->port_num)), Data);
2465 dev_dbg(&port->dev, "ZLIP offset %x\n",
2466 (__u16)(ZLP_REG1 + ((__u16) mos7840_port->port_num)));
2467 if (status < 0) {
2468 dev_dbg(&port->dev, "Writing ZLP_REG%d failed status-0x%x\n", pnum + 2, status);
2469 goto out;
2470 } else
2471 dev_dbg(&port->dev, "ZLP_REG%d Writing success status%d\n", pnum + 2, status);
2472 } else {
2473 Data = 0xff;
2474 status = mos7840_set_reg_sync(port,
2475 (__u16) (ZLP_REG1 +
2476 ((__u16)mos7840_port->port_num) - 0x1), Data);
2477 dev_dbg(&port->dev, "ZLIP offset %x\n",
2478 (__u16)(ZLP_REG1 + ((__u16) mos7840_port->port_num) - 0x1));
2479 if (status < 0) {
2480 dev_dbg(&port->dev, "Writing ZLP_REG%d failed status-0x%x\n", pnum + 1, status);
2481 goto out;
2482 } else
2483 dev_dbg(&port->dev, "ZLP_REG%d Writing success status%d\n", pnum + 1, status);
2484
2485 }
2486 mos7840_port->control_urb = usb_alloc_urb(0, GFP_KERNEL);
2487 mos7840_port->ctrl_buf = kmalloc(16, GFP_KERNEL);
2488 mos7840_port->dr = kmalloc(sizeof(struct usb_ctrlrequest),
2489 GFP_KERNEL);
2490 if (!mos7840_port->control_urb || !mos7840_port->ctrl_buf ||
2491 !mos7840_port->dr) {
2492 status = -ENOMEM;
2493 goto error;
2494 }
2495
2496 mos7840_port->has_led = false;
2497
2498 /* Initialize LED timers */
2499 if (device_type == MOSCHIP_DEVICE_ID_7810) {
2500 mos7840_port->has_led = true;
2501
2502 init_timer(&mos7840_port->led_timer1);
2503 mos7840_port->led_timer1.function = mos7840_led_off;
2504 mos7840_port->led_timer1.expires =
2505 jiffies + msecs_to_jiffies(LED_ON_MS);
2506 mos7840_port->led_timer1.data = (unsigned long)mos7840_port;
2507
2508 init_timer(&mos7840_port->led_timer2);
2509 mos7840_port->led_timer2.function = mos7840_led_flag_off;
2510 mos7840_port->led_timer2.expires =
2511 jiffies + msecs_to_jiffies(LED_OFF_MS);
2512 mos7840_port->led_timer2.data = (unsigned long)mos7840_port;
2513
2514 mos7840_port->led_flag = false;
2515
2516 /* Turn off LED */
2517 mos7840_set_led_sync(port, MODEM_CONTROL_REGISTER, 0x0300);
2518 }
2519 out:
2520 if (pnum == serial->num_ports - 1) {
2521 /* Zero Length flag enable */
2522 Data = 0x0f;
2523 status = mos7840_set_reg_sync(serial->port[0], ZLP_REG5, Data);
2524 if (status < 0) {
2525 dev_dbg(&port->dev, "Writing ZLP_REG5 failed status-0x%x\n", status);
2526 goto error;
2527 } else
2528 dev_dbg(&port->dev, "ZLP_REG5 Writing success status%d\n", status);
2529
2530 /* setting configuration feature to one */
2531 usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0),
2532 0x03, 0x00, 0x01, 0x00, NULL, 0x00,
2533 MOS_WDR_TIMEOUT);
2534 }
2535 return 0;
2536 error:
2537 kfree(mos7840_port->dr);
2538 kfree(mos7840_port->ctrl_buf);
2539 usb_free_urb(mos7840_port->control_urb);
2540 kfree(mos7840_port);
2541
2542 return status;
2543 }
2544
2545 static int mos7840_port_remove(struct usb_serial_port *port)
2546 {
2547 struct moschip_port *mos7840_port;
2548
2549 mos7840_port = mos7840_get_port_private(port);
2550
2551 if (mos7840_port->has_led) {
2552 /* Turn off LED */
2553 mos7840_set_led_sync(port, MODEM_CONTROL_REGISTER, 0x0300);
2554
2555 del_timer_sync(&mos7840_port->led_timer1);
2556 del_timer_sync(&mos7840_port->led_timer2);
2557 }
2558 usb_kill_urb(mos7840_port->control_urb);
2559 usb_free_urb(mos7840_port->control_urb);
2560 kfree(mos7840_port->ctrl_buf);
2561 kfree(mos7840_port->dr);
2562 kfree(mos7840_port);
2563
2564 return 0;
2565 }
2566
2567 static struct usb_serial_driver moschip7840_4port_device = {
2568 .driver = {
2569 .owner = THIS_MODULE,
2570 .name = "mos7840",
2571 },
2572 .description = DRIVER_DESC,
2573 .id_table = id_table,
2574 .num_ports = 4,
2575 .open = mos7840_open,
2576 .close = mos7840_close,
2577 .write = mos7840_write,
2578 .write_room = mos7840_write_room,
2579 .chars_in_buffer = mos7840_chars_in_buffer,
2580 .throttle = mos7840_throttle,
2581 .unthrottle = mos7840_unthrottle,
2582 .calc_num_ports = mos7840_calc_num_ports,
2583 #ifdef MCSSerialProbe
2584 .probe = mos7840_serial_probe,
2585 #endif
2586 .ioctl = mos7840_ioctl,
2587 .set_termios = mos7840_set_termios,
2588 .break_ctl = mos7840_break,
2589 .tiocmget = mos7840_tiocmget,
2590 .tiocmset = mos7840_tiocmset,
2591 .get_icount = mos7840_get_icount,
2592 .port_probe = mos7840_port_probe,
2593 .port_remove = mos7840_port_remove,
2594 .read_bulk_callback = mos7840_bulk_in_callback,
2595 .read_int_callback = mos7840_interrupt_callback,
2596 };
2597
2598 static struct usb_serial_driver * const serial_drivers[] = {
2599 &moschip7840_4port_device, NULL
2600 };
2601
2602 module_usb_serial_driver(serial_drivers, id_table);
2603
2604 MODULE_DESCRIPTION(DRIVER_DESC);
2605 MODULE_LICENSE("GPL");
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