Linux Kernel  3.7.1
 All Data Structures Namespaces Files Functions Variables Typedefs Enumerations Enumerator Macros Groups Pages
mos7840.c
Go to the documentation of this file.
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 <[email protected]>
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 MOS_WDR_TIMEOUT 5000 /* default urb timeout */
86 
87 #define MOS_PORT1 0x0200
88 #define MOS_PORT2 0x0300
89 #define MOS_VENREG 0x0000
90 #define MOS_MAX_PORT 0x02
91 #define MOS_WRITE 0x0E
92 #define MOS_READ 0x0D
93 
94 /* Requests */
95 #define MCS_RD_RTYPE 0xC0
96 #define MCS_WR_RTYPE 0x40
97 #define MCS_RDREQ 0x0D
98 #define MCS_WRREQ 0x0E
99 #define MCS_CTRL_TIMEOUT 500
100 #define VENDOR_READ_LENGTH (0x01)
101 
102 #define MAX_NAME_LEN 64
103 
104 #define ZLP_REG1 0x3A /* Zero_Flag_Reg1 58 */
105 #define ZLP_REG5 0x3E /* Zero_Flag_Reg5 62 */
106 
107 /* For higher baud Rates use TIOCEXBAUD */
108 #define TIOCEXBAUD 0x5462
109 
110 /* vendor id and device id defines */
111 
112 /* The native mos7840/7820 component */
113 #define USB_VENDOR_ID_MOSCHIP 0x9710
114 #define MOSCHIP_DEVICE_ID_7840 0x7840
115 #define MOSCHIP_DEVICE_ID_7820 0x7820
116 #define MOSCHIP_DEVICE_ID_7810 0x7810
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 id_table.
120  */
121 #define USB_VENDOR_ID_BANDB 0x0856
122 #define BANDB_DEVICE_ID_USO9ML2_2 0xAC22
123 #define BANDB_DEVICE_ID_USO9ML2_2P 0xBC00
124 #define BANDB_DEVICE_ID_USO9ML2_4 0xAC24
125 #define BANDB_DEVICE_ID_USO9ML2_4P 0xBC01
126 #define BANDB_DEVICE_ID_US9ML2_2 0xAC29
127 #define BANDB_DEVICE_ID_US9ML2_4 0xAC30
128 #define BANDB_DEVICE_ID_USPTL4_2 0xAC31
129 #define BANDB_DEVICE_ID_USPTL4_4 0xAC32
130 #define BANDB_DEVICE_ID_USOPTL4_2 0xAC42
131 #define BANDB_DEVICE_ID_USOPTL4_2P 0xBC02
132 #define BANDB_DEVICE_ID_USOPTL4_4 0xAC44
133 #define BANDB_DEVICE_ID_USOPTL4_4P 0xBC03
134 #define BANDB_DEVICE_ID_USOPTL2_4 0xAC24
135 
136 /* This driver also supports
137  * ATEN UC2324 device using Moschip MCS7840
138  * ATEN UC2322 device using Moschip MCS7820
139  */
140 #define USB_VENDOR_ID_ATENINTL 0x0557
141 #define ATENINTL_DEVICE_ID_UC2324 0x2011
142 #define ATENINTL_DEVICE_ID_UC2322 0x7820
143 
144 /* Interrupt Routine Defines */
145 
146 #define SERIAL_IIR_RLS 0x06
147 #define SERIAL_IIR_MS 0x00
148 
149 /*
150  * Emulation of the bit mask on the LINE STATUS REGISTER.
151  */
152 #define SERIAL_LSR_DR 0x0001
153 #define SERIAL_LSR_OE 0x0002
154 #define SERIAL_LSR_PE 0x0004
155 #define SERIAL_LSR_FE 0x0008
156 #define SERIAL_LSR_BI 0x0010
157 
158 #define MOS_MSR_DELTA_CTS 0x10
159 #define MOS_MSR_DELTA_DSR 0x20
160 #define MOS_MSR_DELTA_RI 0x40
161 #define MOS_MSR_DELTA_CD 0x80
162 
163 /* Serial Port register Address */
164 #define INTERRUPT_ENABLE_REGISTER ((__u16)(0x01))
165 #define FIFO_CONTROL_REGISTER ((__u16)(0x02))
166 #define LINE_CONTROL_REGISTER ((__u16)(0x03))
167 #define MODEM_CONTROL_REGISTER ((__u16)(0x04))
168 #define LINE_STATUS_REGISTER ((__u16)(0x05))
169 #define MODEM_STATUS_REGISTER ((__u16)(0x06))
170 #define SCRATCH_PAD_REGISTER ((__u16)(0x07))
171 #define DIVISOR_LATCH_LSB ((__u16)(0x00))
172 #define DIVISOR_LATCH_MSB ((__u16)(0x01))
173 
174 #define CLK_MULTI_REGISTER ((__u16)(0x02))
175 #define CLK_START_VALUE_REGISTER ((__u16)(0x03))
176 #define GPIO_REGISTER ((__u16)(0x07))
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 /* LED on/off milliseconds*/
187 #define LED_ON_MS 500
188 #define LED_OFF_MS 500
189 
190 static int device_type;
191 
192 static const struct usb_device_id id_table[] = {
193  {USB_DEVICE(USB_VENDOR_ID_MOSCHIP, MOSCHIP_DEVICE_ID_7840)},
194  {USB_DEVICE(USB_VENDOR_ID_MOSCHIP, MOSCHIP_DEVICE_ID_7820)},
195  {USB_DEVICE(USB_VENDOR_ID_MOSCHIP, MOSCHIP_DEVICE_ID_7810)},
196  {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USO9ML2_2)},
197  {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USO9ML2_2P)},
198  {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USO9ML2_4)},
199  {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USO9ML2_4P)},
200  {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_US9ML2_2)},
201  {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_US9ML2_4)},
202  {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USPTL4_2)},
203  {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USPTL4_4)},
204  {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USOPTL4_2)},
205  {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USOPTL4_2P)},
206  {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USOPTL4_4)},
207  {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USOPTL4_4P)},
208  {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USOPTL2_4)},
209  {USB_DEVICE(USB_VENDOR_ID_ATENINTL, ATENINTL_DEVICE_ID_UC2324)},
210  {USB_DEVICE(USB_VENDOR_ID_ATENINTL, ATENINTL_DEVICE_ID_UC2322)},
211  {} /* terminating entry */
212 };
213 MODULE_DEVICE_TABLE(usb, id_table);
214 
215 /* This structure holds all of the local port information */
216 
217 struct moschip_port {
218  int port_num; /*Actual port number in the device(1,2,etc) */
219  struct urb *write_urb; /* write URB for this port */
220  struct urb *read_urb; /* read URB for this port */
221  __u8 shadowLCR; /* last LCR value received */
222  __u8 shadowMCR; /* last MCR value received */
223  char open;
224  char open_ports;
225  wait_queue_head_t wait_chase; /* for handling sleeping while waiting for chase to finish */
226  wait_queue_head_t delta_msr_wait; /* for handling sleeping while waiting for msr change to happen */
227  int delta_msr_cond;
228  struct async_icount icount;
229  struct usb_serial_port *port; /* loop back to the owner of this object */
230 
231  /* Offsets */
232  __u8 SpRegOffset;
233  __u8 ControlRegOffset;
234  __u8 DcrRegOffset;
235  /* for processing control URBS in interrupt context */
236  struct urb *control_urb;
237  struct usb_ctrlrequest *dr;
238  char *ctrl_buf;
239  int MsrLsr;
240 
241  spinlock_t pool_lock;
242  struct urb *write_urb_pool[NUM_URBS];
243  char busy[NUM_URBS];
244  bool read_urb_busy;
245 
246  /* For device(s) with LED indicator */
247  bool has_led;
248  bool led_flag;
249  struct timer_list led_timer1; /* Timer for LED on */
250  struct timer_list led_timer2; /* Timer for LED off */
251 };
252 
253 /*
254  * mos7840_set_reg_sync
255  * To set the Control register by calling usb_fill_control_urb function
256  * by passing usb_sndctrlpipe function as parameter.
257  */
258 
259 static int mos7840_set_reg_sync(struct usb_serial_port *port, __u16 reg,
260  __u16 val)
261 {
262  struct usb_device *dev = port->serial->dev;
263  val = val & 0x00ff;
264  dev_dbg(&port->dev, "mos7840_set_reg_sync offset is %x, value %x\n", reg, val);
265 
266  return usb_control_msg(dev, usb_sndctrlpipe(dev, 0), MCS_WRREQ,
267  MCS_WR_RTYPE, val, reg, NULL, 0,
268  MOS_WDR_TIMEOUT);
269 }
270 
271 /*
272  * mos7840_get_reg_sync
273  * To set the Uart register by calling usb_fill_control_urb function by
274  * passing usb_rcvctrlpipe function as parameter.
275  */
276 
277 static int mos7840_get_reg_sync(struct usb_serial_port *port, __u16 reg,
278  __u16 *val)
279 {
280  struct usb_device *dev = port->serial->dev;
281  int ret = 0;
282  u8 *buf;
283 
284  buf = kmalloc(VENDOR_READ_LENGTH, GFP_KERNEL);
285  if (!buf)
286  return -ENOMEM;
287 
288  ret = usb_control_msg(dev, usb_rcvctrlpipe(dev, 0), MCS_RDREQ,
289  MCS_RD_RTYPE, 0, reg, buf, VENDOR_READ_LENGTH,
290  MOS_WDR_TIMEOUT);
291  *val = buf[0];
292  dev_dbg(&port->dev, "%s offset is %x, return val %x\n", __func__, reg, *val);
293 
294  kfree(buf);
295  return ret;
296 }
297 
298 /*
299  * mos7840_set_uart_reg
300  * To set the Uart register by calling usb_fill_control_urb function by
301  * passing usb_sndctrlpipe function as parameter.
302  */
303 
304 static int mos7840_set_uart_reg(struct usb_serial_port *port, __u16 reg,
305  __u16 val)
306 {
307 
308  struct usb_device *dev = port->serial->dev;
309  val = val & 0x00ff;
310  /* For the UART control registers, the application number need
311  to be Or'ed */
312  if (port->serial->num_ports == 4) {
313  val |= (((__u16) port->number -
314  (__u16) (port->serial->minor)) + 1) << 8;
315  } else {
316  if (((__u16) port->number - (__u16) (port->serial->minor)) == 0) {
317  val |= (((__u16) port->number -
318  (__u16) (port->serial->minor)) + 1) << 8;
319  } else {
320  val |= (((__u16) port->number -
321  (__u16) (port->serial->minor)) + 2) << 8;
322  }
323  }
324  dev_dbg(&port->dev, "%s application number is %x\n", __func__, val);
325  return usb_control_msg(dev, usb_sndctrlpipe(dev, 0), MCS_WRREQ,
326  MCS_WR_RTYPE, val, reg, NULL, 0,
327  MOS_WDR_TIMEOUT);
328 
329 }
330 
331 /*
332  * mos7840_get_uart_reg
333  * To set the Control register by calling usb_fill_control_urb function
334  * by passing usb_rcvctrlpipe function as parameter.
335  */
336 static int mos7840_get_uart_reg(struct usb_serial_port *port, __u16 reg,
337  __u16 *val)
338 {
339  struct usb_device *dev = port->serial->dev;
340  int ret = 0;
341  __u16 Wval;
342  u8 *buf;
343 
344  buf = kmalloc(VENDOR_READ_LENGTH, GFP_KERNEL);
345  if (!buf)
346  return -ENOMEM;
347 
348  /* Wval is same as application number */
349  if (port->serial->num_ports == 4) {
350  Wval =
351  (((__u16) port->number - (__u16) (port->serial->minor)) +
352  1) << 8;
353  } else {
354  if (((__u16) port->number - (__u16) (port->serial->minor)) == 0) {
355  Wval = (((__u16) port->number -
356  (__u16) (port->serial->minor)) + 1) << 8;
357  } else {
358  Wval = (((__u16) port->number -
359  (__u16) (port->serial->minor)) + 2) << 8;
360  }
361  }
362  dev_dbg(&port->dev, "%s application number is %x\n", __func__, Wval);
363  ret = usb_control_msg(dev, usb_rcvctrlpipe(dev, 0), MCS_RDREQ,
364  MCS_RD_RTYPE, Wval, reg, buf, VENDOR_READ_LENGTH,
365  MOS_WDR_TIMEOUT);
366  *val = buf[0];
367 
368  kfree(buf);
369  return ret;
370 }
371 
372 static void mos7840_dump_serial_port(struct usb_serial_port *port,
373  struct moschip_port *mos7840_port)
374 {
375 
376  dev_dbg(&port->dev, "SpRegOffset is %2x\n", mos7840_port->SpRegOffset);
377  dev_dbg(&port->dev, "ControlRegOffset is %2x\n", mos7840_port->ControlRegOffset);
378  dev_dbg(&port->dev, "DCRRegOffset is %2x\n", mos7840_port->DcrRegOffset);
379 
380 }
381 
382 /************************************************************************/
383 /************************************************************************/
384 /* I N T E R F A C E F U N C T I O N S */
385 /* I N T E R F A C E F U N C T I O N S */
386 /************************************************************************/
387 /************************************************************************/
388 
389 static inline void mos7840_set_port_private(struct usb_serial_port *port,
390  struct moschip_port *data)
391 {
392  usb_set_serial_port_data(port, (void *)data);
393 }
394 
395 static inline struct moschip_port *mos7840_get_port_private(struct
396  usb_serial_port
397  *port)
398 {
399  return (struct moschip_port *)usb_get_serial_port_data(port);
400 }
401 
402 static void mos7840_handle_new_msr(struct moschip_port *port, __u8 new_msr)
403 {
404  struct moschip_port *mos7840_port;
405  struct async_icount *icount;
406  mos7840_port = port;
407  icount = &mos7840_port->icount;
408  if (new_msr &
409  (MOS_MSR_DELTA_CTS | MOS_MSR_DELTA_DSR | MOS_MSR_DELTA_RI |
410  MOS_MSR_DELTA_CD)) {
411  icount = &mos7840_port->icount;
412 
413  /* update input line counters */
414  if (new_msr & MOS_MSR_DELTA_CTS) {
415  icount->cts++;
416  smp_wmb();
417  }
418  if (new_msr & MOS_MSR_DELTA_DSR) {
419  icount->dsr++;
420  smp_wmb();
421  }
422  if (new_msr & MOS_MSR_DELTA_CD) {
423  icount->dcd++;
424  smp_wmb();
425  }
426  if (new_msr & MOS_MSR_DELTA_RI) {
427  icount->rng++;
428  smp_wmb();
429  }
430  }
431 }
432 
433 static void mos7840_handle_new_lsr(struct moschip_port *port, __u8 new_lsr)
434 {
435  struct async_icount *icount;
436 
437  if (new_lsr & SERIAL_LSR_BI) {
438  /*
439  * Parity and Framing errors only count if they
440  * occur exclusive of a break being
441  * received.
442  */
443  new_lsr &= (__u8) (SERIAL_LSR_OE | SERIAL_LSR_BI);
444  }
445 
446  /* update input line counters */
447  icount = &port->icount;
448  if (new_lsr & SERIAL_LSR_BI) {
449  icount->brk++;
450  smp_wmb();
451  }
452  if (new_lsr & SERIAL_LSR_OE) {
453  icount->overrun++;
454  smp_wmb();
455  }
456  if (new_lsr & SERIAL_LSR_PE) {
457  icount->parity++;
458  smp_wmb();
459  }
460  if (new_lsr & SERIAL_LSR_FE) {
461  icount->frame++;
462  smp_wmb();
463  }
464 }
465 
466 /************************************************************************/
467 /************************************************************************/
468 /* U S B C A L L B A C K F U N C T I O N S */
469 /* U S B C A L L B A C K F U N C T I O N S */
470 /************************************************************************/
471 /************************************************************************/
472 
473 static void mos7840_control_callback(struct urb *urb)
474 {
475  unsigned char *data;
476  struct moschip_port *mos7840_port;
477  struct device *dev = &urb->dev->dev;
478  __u8 regval = 0x0;
479  int status = urb->status;
480 
481  mos7840_port = urb->context;
482 
483  switch (status) {
484  case 0:
485  /* success */
486  break;
487  case -ECONNRESET:
488  case -ENOENT:
489  case -ESHUTDOWN:
490  /* this urb is terminated, clean up */
491  dev_dbg(dev, "%s - urb shutting down with status: %d\n", __func__, status);
492  return;
493  default:
494  dev_dbg(dev, "%s - nonzero urb status received: %d\n", __func__, status);
495  return;
496  }
497 
498  dev_dbg(dev, "%s urb buffer size is %d\n", __func__, urb->actual_length);
499  dev_dbg(dev, "%s mos7840_port->MsrLsr is %d port %d\n", __func__,
500  mos7840_port->MsrLsr, mos7840_port->port_num);
501  data = urb->transfer_buffer;
502  regval = (__u8) data[0];
503  dev_dbg(dev, "%s data is %x\n", __func__, regval);
504  if (mos7840_port->MsrLsr == 0)
505  mos7840_handle_new_msr(mos7840_port, regval);
506  else if (mos7840_port->MsrLsr == 1)
507  mos7840_handle_new_lsr(mos7840_port, regval);
508 }
509 
510 static int mos7840_get_reg(struct moschip_port *mcs, __u16 Wval, __u16 reg,
511  __u16 *val)
512 {
513  struct usb_device *dev = mcs->port->serial->dev;
514  struct usb_ctrlrequest *dr = mcs->dr;
515  unsigned char *buffer = mcs->ctrl_buf;
516  int ret;
517 
518  dr->bRequestType = MCS_RD_RTYPE;
519  dr->bRequest = MCS_RDREQ;
520  dr->wValue = cpu_to_le16(Wval); /* 0 */
521  dr->wIndex = cpu_to_le16(reg);
522  dr->wLength = cpu_to_le16(2);
523 
524  usb_fill_control_urb(mcs->control_urb, dev, usb_rcvctrlpipe(dev, 0),
525  (unsigned char *)dr, buffer, 2,
526  mos7840_control_callback, mcs);
527  mcs->control_urb->transfer_buffer_length = 2;
528  ret = usb_submit_urb(mcs->control_urb, GFP_ATOMIC);
529  return ret;
530 }
531 
532 static void mos7840_set_led_callback(struct urb *urb)
533 {
534  switch (urb->status) {
535  case 0:
536  /* Success */
537  break;
538  case -ECONNRESET:
539  case -ENOENT:
540  case -ESHUTDOWN:
541  /* This urb is terminated, clean up */
542  dev_dbg(&urb->dev->dev, "%s - urb shutting down with status: %d",
543  __func__, urb->status);
544  break;
545  default:
546  dev_dbg(&urb->dev->dev, "%s - nonzero urb status received: %d",
547  __func__, urb->status);
548  }
549 }
550 
551 static void mos7840_set_led_async(struct moschip_port *mcs, __u16 wval,
552  __u16 reg)
553 {
554  struct usb_device *dev = mcs->port->serial->dev;
555  struct usb_ctrlrequest *dr = mcs->dr;
556 
557  dr->bRequestType = MCS_WR_RTYPE;
558  dr->bRequest = MCS_WRREQ;
559  dr->wValue = cpu_to_le16(wval);
560  dr->wIndex = cpu_to_le16(reg);
561  dr->wLength = cpu_to_le16(0);
562 
563  usb_fill_control_urb(mcs->control_urb, dev, usb_sndctrlpipe(dev, 0),
564  (unsigned char *)dr, NULL, 0, mos7840_set_led_callback, NULL);
565 
566  usb_submit_urb(mcs->control_urb, GFP_ATOMIC);
567 }
568 
569 static void mos7840_set_led_sync(struct usb_serial_port *port, __u16 reg,
570  __u16 val)
571 {
572  struct usb_device *dev = port->serial->dev;
573 
574  usb_control_msg(dev, usb_sndctrlpipe(dev, 0), MCS_WRREQ, MCS_WR_RTYPE,
575  val, reg, NULL, 0, MOS_WDR_TIMEOUT);
576 }
577 
578 static void mos7840_led_off(unsigned long arg)
579 {
580  struct moschip_port *mcs = (struct moschip_port *) arg;
581 
582  /* Turn off LED */
583  mos7840_set_led_async(mcs, 0x0300, MODEM_CONTROL_REGISTER);
584  mod_timer(&mcs->led_timer2,
585  jiffies + msecs_to_jiffies(LED_OFF_MS));
586 }
587 
588 static void mos7840_led_flag_off(unsigned long arg)
589 {
590  struct moschip_port *mcs = (struct moschip_port *) arg;
591 
592  mcs->led_flag = false;
593 }
594 
595 /*****************************************************************************
596  * mos7840_interrupt_callback
597  * this is the callback function for when we have received data on the
598  * interrupt endpoint.
599  *****************************************************************************/
600 
601 static void mos7840_interrupt_callback(struct urb *urb)
602 {
603  int result;
604  int length;
605  struct moschip_port *mos7840_port;
606  struct usb_serial *serial;
607  __u16 Data;
608  unsigned char *data;
609  __u8 sp[5], st;
610  int i, rv = 0;
611  __u16 wval, wreg = 0;
612  int status = urb->status;
613 
614  switch (status) {
615  case 0:
616  /* success */
617  break;
618  case -ECONNRESET:
619  case -ENOENT:
620  case -ESHUTDOWN:
621  /* this urb is terminated, clean up */
622  dev_dbg(&urb->dev->dev, "%s - urb shutting down with status: %d\n",
623  __func__, status);
624  return;
625  default:
626  dev_dbg(&urb->dev->dev, "%s - nonzero urb status received: %d\n",
627  __func__, status);
628  goto exit;
629  }
630 
631  length = urb->actual_length;
632  data = urb->transfer_buffer;
633 
634  serial = urb->context;
635 
636  /* Moschip get 5 bytes
637  * Byte 1 IIR Port 1 (port.number is 0)
638  * Byte 2 IIR Port 2 (port.number is 1)
639  * Byte 3 IIR Port 3 (port.number is 2)
640  * Byte 4 IIR Port 4 (port.number is 3)
641  * Byte 5 FIFO status for both */
642 
643  if (length && length > 5) {
644  dev_dbg(&urb->dev->dev, "%s", "Wrong data !!!\n");
645  return;
646  }
647 
648  sp[0] = (__u8) data[0];
649  sp[1] = (__u8) data[1];
650  sp[2] = (__u8) data[2];
651  sp[3] = (__u8) data[3];
652  st = (__u8) data[4];
653 
654  for (i = 0; i < serial->num_ports; i++) {
655  mos7840_port = mos7840_get_port_private(serial->port[i]);
656  wval =
657  (((__u16) serial->port[i]->number -
658  (__u16) (serial->minor)) + 1) << 8;
659  if (mos7840_port->open) {
660  if (sp[i] & 0x01) {
661  dev_dbg(&urb->dev->dev, "SP%d No Interrupt !!!\n", i);
662  } else {
663  switch (sp[i] & 0x0f) {
664  case SERIAL_IIR_RLS:
665  dev_dbg(&urb->dev->dev, "Serial Port %d: Receiver status error or \n", i);
666  dev_dbg(&urb->dev->dev, "address bit detected in 9-bit mode\n");
667  mos7840_port->MsrLsr = 1;
668  wreg = LINE_STATUS_REGISTER;
669  break;
670  case SERIAL_IIR_MS:
671  dev_dbg(&urb->dev->dev, "Serial Port %d: Modem status change\n", i);
672  mos7840_port->MsrLsr = 0;
673  wreg = MODEM_STATUS_REGISTER;
674  break;
675  }
676  rv = mos7840_get_reg(mos7840_port, wval, wreg, &Data);
677  }
678  }
679  }
680  if (!(rv < 0))
681  /* the completion handler for the control urb will resubmit */
682  return;
683 exit:
684  result = usb_submit_urb(urb, GFP_ATOMIC);
685  if (result) {
686  dev_err(&urb->dev->dev,
687  "%s - Error %d submitting interrupt urb\n",
688  __func__, result);
689  }
690 }
691 
692 static int mos7840_port_paranoia_check(struct usb_serial_port *port,
693  const char *function)
694 {
695  if (!port) {
696  pr_debug("%s - port == NULL\n", function);
697  return -1;
698  }
699  if (!port->serial) {
700  pr_debug("%s - port->serial == NULL\n", function);
701  return -1;
702  }
703 
704  return 0;
705 }
706 
707 /* Inline functions to check the sanity of a pointer that is passed to us */
708 static int mos7840_serial_paranoia_check(struct usb_serial *serial,
709  const char *function)
710 {
711  if (!serial) {
712  pr_debug("%s - serial == NULL\n", function);
713  return -1;
714  }
715  if (!serial->type) {
716  pr_debug("%s - serial->type == NULL!\n", function);
717  return -1;
718  }
719 
720  return 0;
721 }
722 
723 static struct usb_serial *mos7840_get_usb_serial(struct usb_serial_port *port,
724  const char *function)
725 {
726  /* if no port was specified, or it fails a paranoia check */
727  if (!port ||
728  mos7840_port_paranoia_check(port, function) ||
729  mos7840_serial_paranoia_check(port->serial, function)) {
730  /* then say that we don't have a valid usb_serial thing,
731  * which will end up genrating -ENODEV return values */
732  return NULL;
733  }
734 
735  return port->serial;
736 }
737 
738 /*****************************************************************************
739  * mos7840_bulk_in_callback
740  * this is the callback function for when we have received data on the
741  * bulk in endpoint.
742  *****************************************************************************/
743 
744 static void mos7840_bulk_in_callback(struct urb *urb)
745 {
746  int retval;
747  unsigned char *data;
748  struct usb_serial *serial;
749  struct usb_serial_port *port;
750  struct moschip_port *mos7840_port;
751  struct tty_struct *tty;
752  int status = urb->status;
753 
754  mos7840_port = urb->context;
755  if (!mos7840_port)
756  return;
757 
758  if (status) {
759  dev_dbg(&urb->dev->dev, "nonzero read bulk status received: %d\n", status);
760  mos7840_port->read_urb_busy = false;
761  return;
762  }
763 
764  port = mos7840_port->port;
765  if (mos7840_port_paranoia_check(port, __func__)) {
766  mos7840_port->read_urb_busy = false;
767  return;
768  }
769 
770  serial = mos7840_get_usb_serial(port, __func__);
771  if (!serial) {
772  mos7840_port->read_urb_busy = false;
773  return;
774  }
775 
776  data = urb->transfer_buffer;
777  usb_serial_debug_data(&port->dev, __func__, urb->actual_length, data);
778 
779  if (urb->actual_length) {
780  tty = tty_port_tty_get(&mos7840_port->port->port);
781  if (tty) {
782  tty_insert_flip_string(tty, data, urb->actual_length);
783  tty_flip_buffer_push(tty);
784  tty_kref_put(tty);
785  }
786  mos7840_port->icount.rx += urb->actual_length;
787  smp_wmb();
788  dev_dbg(&port->dev, "mos7840_port->icount.rx is %d:\n", mos7840_port->icount.rx);
789  }
790 
791  if (!mos7840_port->read_urb) {
792  dev_dbg(&port->dev, "%s", "URB KILLED !!!\n");
793  mos7840_port->read_urb_busy = false;
794  return;
795  }
796 
797  /* Turn on LED */
798  if (mos7840_port->has_led && !mos7840_port->led_flag) {
799  mos7840_port->led_flag = true;
800  mos7840_set_led_async(mos7840_port, 0x0301,
801  MODEM_CONTROL_REGISTER);
802  mod_timer(&mos7840_port->led_timer1,
803  jiffies + msecs_to_jiffies(LED_ON_MS));
804  }
805 
806  mos7840_port->read_urb_busy = true;
807  retval = usb_submit_urb(mos7840_port->read_urb, GFP_ATOMIC);
808 
809  if (retval) {
810  dev_dbg(&port->dev, "usb_submit_urb(read bulk) failed, retval = %d\n", retval);
811  mos7840_port->read_urb_busy = false;
812  }
813 }
814 
815 /*****************************************************************************
816  * mos7840_bulk_out_data_callback
817  * this is the callback function for when we have finished sending
818  * serial data on the bulk out endpoint.
819  *****************************************************************************/
820 
821 static void mos7840_bulk_out_data_callback(struct urb *urb)
822 {
823  struct moschip_port *mos7840_port;
824  struct usb_serial_port *port;
825  struct tty_struct *tty;
826  int status = urb->status;
827  int i;
828 
829  mos7840_port = urb->context;
830  port = mos7840_port->port;
831  spin_lock(&mos7840_port->pool_lock);
832  for (i = 0; i < NUM_URBS; i++) {
833  if (urb == mos7840_port->write_urb_pool[i]) {
834  mos7840_port->busy[i] = 0;
835  break;
836  }
837  }
838  spin_unlock(&mos7840_port->pool_lock);
839 
840  if (status) {
841  dev_dbg(&port->dev, "nonzero write bulk status received:%d\n", status);
842  return;
843  }
844 
845  if (mos7840_port_paranoia_check(port, __func__))
846  return;
847 
848  tty = tty_port_tty_get(&port->port);
849  if (tty && mos7840_port->open)
850  tty_wakeup(tty);
851  tty_kref_put(tty);
852 
853 }
854 
855 /************************************************************************/
856 /* 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 */
857 /************************************************************************/
858 #ifdef MCSSerialProbe
859 static int mos7840_serial_probe(struct usb_serial *serial,
860  const struct usb_device_id *id)
861 {
862 
863  /*need to implement the mode_reg reading and updating\
864  structures usb_serial_ device_type\
865  (i.e num_ports, num_bulkin,bulkout etc) */
866  /* Also we can update the changes attach */
867  return 1;
868 }
869 #endif
870 
871 /*****************************************************************************
872  * mos7840_open
873  * this function is called by the tty driver when a port is opened
874  * If successful, we return 0
875  * Otherwise we return a negative error number.
876  *****************************************************************************/
877 
878 static int mos7840_open(struct tty_struct *tty, struct usb_serial_port *port)
879 {
880  int response;
881  int j;
882  struct usb_serial *serial;
883  struct urb *urb;
884  __u16 Data;
885  int status;
886  struct moschip_port *mos7840_port;
887  struct moschip_port *port0;
888 
889  if (mos7840_port_paranoia_check(port, __func__))
890  return -ENODEV;
891 
892  serial = port->serial;
893 
894  if (mos7840_serial_paranoia_check(serial, __func__))
895  return -ENODEV;
896 
897  mos7840_port = mos7840_get_port_private(port);
898  port0 = mos7840_get_port_private(serial->port[0]);
899 
900  if (mos7840_port == NULL || port0 == NULL)
901  return -ENODEV;
902 
903  usb_clear_halt(serial->dev, port->write_urb->pipe);
904  usb_clear_halt(serial->dev, port->read_urb->pipe);
905  port0->open_ports++;
906 
907  /* Initialising the write urb pool */
908  for (j = 0; j < NUM_URBS; ++j) {
909  urb = usb_alloc_urb(0, GFP_KERNEL);
910  mos7840_port->write_urb_pool[j] = urb;
911 
912  if (urb == NULL) {
913  dev_err(&port->dev, "No more urbs???\n");
914  continue;
915  }
916 
917  urb->transfer_buffer = kmalloc(URB_TRANSFER_BUFFER_SIZE,
918  GFP_KERNEL);
919  if (!urb->transfer_buffer) {
920  usb_free_urb(urb);
921  mos7840_port->write_urb_pool[j] = NULL;
922  dev_err(&port->dev,
923  "%s-out of memory for urb buffers.\n",
924  __func__);
925  continue;
926  }
927  }
928 
929 /*****************************************************************************
930  * Initialize MCS7840 -- Write Init values to corresponding Registers
931  *
932  * Register Index
933  * 1 : IER
934  * 2 : FCR
935  * 3 : LCR
936  * 4 : MCR
937  *
938  * 0x08 : SP1/2 Control Reg
939  *****************************************************************************/
940 
941  /* NEED to check the following Block */
942 
943  Data = 0x0;
944  status = mos7840_get_reg_sync(port, mos7840_port->SpRegOffset, &Data);
945  if (status < 0) {
946  dev_dbg(&port->dev, "Reading Spreg failed\n");
947  return -1;
948  }
949  Data |= 0x80;
950  status = mos7840_set_reg_sync(port, mos7840_port->SpRegOffset, Data);
951  if (status < 0) {
952  dev_dbg(&port->dev, "writing Spreg failed\n");
953  return -1;
954  }
955 
956  Data &= ~0x80;
957  status = mos7840_set_reg_sync(port, mos7840_port->SpRegOffset, Data);
958  if (status < 0) {
959  dev_dbg(&port->dev, "writing Spreg failed\n");
960  return -1;
961  }
962  /* End of block to be checked */
963 
964  Data = 0x0;
965  status = mos7840_get_reg_sync(port, mos7840_port->ControlRegOffset,
966  &Data);
967  if (status < 0) {
968  dev_dbg(&port->dev, "Reading Controlreg failed\n");
969  return -1;
970  }
971  Data |= 0x08; /* Driver done bit */
972  Data |= 0x20; /* rx_disable */
973  status = mos7840_set_reg_sync(port,
974  mos7840_port->ControlRegOffset, Data);
975  if (status < 0) {
976  dev_dbg(&port->dev, "writing Controlreg failed\n");
977  return -1;
978  }
979  /* do register settings here */
980  /* Set all regs to the device default values. */
981  /***********************************
982  * First Disable all interrupts.
983  ***********************************/
984  Data = 0x00;
985  status = mos7840_set_uart_reg(port, INTERRUPT_ENABLE_REGISTER, Data);
986  if (status < 0) {
987  dev_dbg(&port->dev, "disabling interrupts failed\n");
988  return -1;
989  }
990  /* Set FIFO_CONTROL_REGISTER to the default value */
991  Data = 0x00;
992  status = mos7840_set_uart_reg(port, FIFO_CONTROL_REGISTER, Data);
993  if (status < 0) {
994  dev_dbg(&port->dev, "Writing FIFO_CONTROL_REGISTER failed\n");
995  return -1;
996  }
997 
998  Data = 0xcf;
999  status = mos7840_set_uart_reg(port, FIFO_CONTROL_REGISTER, Data);
1000  if (status < 0) {
1001  dev_dbg(&port->dev, "Writing FIFO_CONTROL_REGISTER failed\n");
1002  return -1;
1003  }
1004 
1005  Data = 0x03;
1006  status = mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data);
1007  mos7840_port->shadowLCR = Data;
1008 
1009  Data = 0x0b;
1010  status = mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER, Data);
1011  mos7840_port->shadowMCR = Data;
1012 
1013  Data = 0x00;
1014  status = mos7840_get_uart_reg(port, LINE_CONTROL_REGISTER, &Data);
1015  mos7840_port->shadowLCR = Data;
1016 
1017  Data |= SERIAL_LCR_DLAB; /* data latch enable in LCR 0x80 */
1018  status = mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data);
1019 
1020  Data = 0x0c;
1021  status = mos7840_set_uart_reg(port, DIVISOR_LATCH_LSB, Data);
1022 
1023  Data = 0x0;
1024  status = mos7840_set_uart_reg(port, DIVISOR_LATCH_MSB, Data);
1025 
1026  Data = 0x00;
1027  status = mos7840_get_uart_reg(port, LINE_CONTROL_REGISTER, &Data);
1028 
1029  Data = Data & ~SERIAL_LCR_DLAB;
1030  status = mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data);
1031  mos7840_port->shadowLCR = Data;
1032 
1033  /* clearing Bulkin and Bulkout Fifo */
1034  Data = 0x0;
1035  status = mos7840_get_reg_sync(port, mos7840_port->SpRegOffset, &Data);
1036 
1037  Data = Data | 0x0c;
1038  status = mos7840_set_reg_sync(port, mos7840_port->SpRegOffset, Data);
1039 
1040  Data = Data & ~0x0c;
1041  status = mos7840_set_reg_sync(port, mos7840_port->SpRegOffset, Data);
1042  /* Finally enable all interrupts */
1043  Data = 0x0c;
1044  status = mos7840_set_uart_reg(port, INTERRUPT_ENABLE_REGISTER, Data);
1045 
1046  /* clearing rx_disable */
1047  Data = 0x0;
1048  status = mos7840_get_reg_sync(port, mos7840_port->ControlRegOffset,
1049  &Data);
1050  Data = Data & ~0x20;
1051  status = mos7840_set_reg_sync(port, mos7840_port->ControlRegOffset,
1052  Data);
1053 
1054  /* rx_negate */
1055  Data = 0x0;
1056  status = mos7840_get_reg_sync(port, mos7840_port->ControlRegOffset,
1057  &Data);
1058  Data = Data | 0x10;
1059  status = mos7840_set_reg_sync(port, mos7840_port->ControlRegOffset,
1060  Data);
1061 
1062  /* Check to see if we've set up our endpoint info yet *
1063  * (can't set it up in mos7840_startup as the structures *
1064  * were not set up at that time.) */
1065  if (port0->open_ports == 1) {
1066  if (serial->port[0]->interrupt_in_buffer == NULL) {
1067  /* set up interrupt urb */
1068  usb_fill_int_urb(serial->port[0]->interrupt_in_urb,
1069  serial->dev,
1070  usb_rcvintpipe(serial->dev,
1071  serial->port[0]->interrupt_in_endpointAddress),
1072  serial->port[0]->interrupt_in_buffer,
1073  serial->port[0]->interrupt_in_urb->
1074  transfer_buffer_length,
1075  mos7840_interrupt_callback,
1076  serial,
1077  serial->port[0]->interrupt_in_urb->interval);
1078 
1079  /* start interrupt read for mos7840 *
1080  * will continue as long as mos7840 is connected */
1081 
1082  response =
1083  usb_submit_urb(serial->port[0]->interrupt_in_urb,
1084  GFP_KERNEL);
1085  if (response) {
1086  dev_err(&port->dev, "%s - Error %d submitting "
1087  "interrupt urb\n", __func__, response);
1088  }
1089 
1090  }
1091 
1092  }
1093 
1094  /* see if we've set up our endpoint info yet *
1095  * (can't set it up in mos7840_startup as the *
1096  * structures were not set up at that time.) */
1097 
1098  dev_dbg(&port->dev, "port number is %d\n", port->number);
1099  dev_dbg(&port->dev, "serial number is %d\n", port->serial->minor);
1100  dev_dbg(&port->dev, "Bulkin endpoint is %d\n", port->bulk_in_endpointAddress);
1101  dev_dbg(&port->dev, "BulkOut endpoint is %d\n", port->bulk_out_endpointAddress);
1102  dev_dbg(&port->dev, "Interrupt endpoint is %d\n", port->interrupt_in_endpointAddress);
1103  dev_dbg(&port->dev, "port's number in the device is %d\n", mos7840_port->port_num);
1104  mos7840_port->read_urb = port->read_urb;
1105 
1106  /* set up our bulk in urb */
1107  if ((serial->num_ports == 2)
1108  && ((((__u16)port->number -
1109  (__u16)(port->serial->minor)) % 2) != 0)) {
1110  usb_fill_bulk_urb(mos7840_port->read_urb,
1111  serial->dev,
1112  usb_rcvbulkpipe(serial->dev,
1113  (port->bulk_in_endpointAddress) + 2),
1114  port->bulk_in_buffer,
1115  mos7840_port->read_urb->transfer_buffer_length,
1116  mos7840_bulk_in_callback, mos7840_port);
1117  } else {
1118  usb_fill_bulk_urb(mos7840_port->read_urb,
1119  serial->dev,
1120  usb_rcvbulkpipe(serial->dev,
1121  port->bulk_in_endpointAddress),
1122  port->bulk_in_buffer,
1123  mos7840_port->read_urb->transfer_buffer_length,
1124  mos7840_bulk_in_callback, mos7840_port);
1125  }
1126 
1127  dev_dbg(&port->dev, "%s: bulkin endpoint is %d\n", __func__, port->bulk_in_endpointAddress);
1128  mos7840_port->read_urb_busy = true;
1129  response = usb_submit_urb(mos7840_port->read_urb, GFP_KERNEL);
1130  if (response) {
1131  dev_err(&port->dev, "%s - Error %d submitting control urb\n",
1132  __func__, response);
1133  mos7840_port->read_urb_busy = false;
1134  }
1135 
1136  /* initialize our wait queues */
1137  init_waitqueue_head(&mos7840_port->wait_chase);
1138  init_waitqueue_head(&mos7840_port->delta_msr_wait);
1139 
1140  /* initialize our icount structure */
1141  memset(&(mos7840_port->icount), 0x00, sizeof(mos7840_port->icount));
1142 
1143  /* initialize our port settings */
1144  /* Must set to enable ints! */
1145  mos7840_port->shadowMCR = MCR_MASTER_IE;
1146  /* send a open port command */
1147  mos7840_port->open = 1;
1148  /* mos7840_change_port_settings(mos7840_port,old_termios); */
1149  mos7840_port->icount.tx = 0;
1150  mos7840_port->icount.rx = 0;
1151 
1152  return 0;
1153 }
1154 
1155 /*****************************************************************************
1156  * mos7840_chars_in_buffer
1157  * this function is called by the tty driver when it wants to know how many
1158  * bytes of data we currently have outstanding in the port (data that has
1159  * been written, but hasn't made it out the port yet)
1160  * If successful, we return the number of bytes left to be written in the
1161  * system,
1162  * Otherwise we return zero.
1163  *****************************************************************************/
1164 
1165 static int mos7840_chars_in_buffer(struct tty_struct *tty)
1166 {
1167  struct usb_serial_port *port = tty->driver_data;
1168  int i;
1169  int chars = 0;
1170  unsigned long flags;
1171  struct moschip_port *mos7840_port;
1172 
1173  if (mos7840_port_paranoia_check(port, __func__))
1174  return 0;
1175 
1176  mos7840_port = mos7840_get_port_private(port);
1177  if (mos7840_port == NULL)
1178  return 0;
1179 
1180  spin_lock_irqsave(&mos7840_port->pool_lock, flags);
1181  for (i = 0; i < NUM_URBS; ++i) {
1182  if (mos7840_port->busy[i]) {
1183  struct urb *urb = mos7840_port->write_urb_pool[i];
1184  chars += urb->transfer_buffer_length;
1185  }
1186  }
1187  spin_unlock_irqrestore(&mos7840_port->pool_lock, flags);
1188  dev_dbg(&port->dev, "%s - returns %d\n", __func__, chars);
1189  return chars;
1190 
1191 }
1192 
1193 /*****************************************************************************
1194  * mos7840_close
1195  * this function is called by the tty driver when a port is closed
1196  *****************************************************************************/
1197 
1198 static void mos7840_close(struct usb_serial_port *port)
1199 {
1200  struct usb_serial *serial;
1201  struct moschip_port *mos7840_port;
1202  struct moschip_port *port0;
1203  int j;
1204  __u16 Data;
1205 
1206  if (mos7840_port_paranoia_check(port, __func__))
1207  return;
1208 
1209  serial = mos7840_get_usb_serial(port, __func__);
1210  if (!serial)
1211  return;
1212 
1213  mos7840_port = mos7840_get_port_private(port);
1214  port0 = mos7840_get_port_private(serial->port[0]);
1215 
1216  if (mos7840_port == NULL || port0 == NULL)
1217  return;
1218 
1219  for (j = 0; j < NUM_URBS; ++j)
1220  usb_kill_urb(mos7840_port->write_urb_pool[j]);
1221 
1222  /* Freeing Write URBs */
1223  for (j = 0; j < NUM_URBS; ++j) {
1224  if (mos7840_port->write_urb_pool[j]) {
1225  if (mos7840_port->write_urb_pool[j]->transfer_buffer)
1226  kfree(mos7840_port->write_urb_pool[j]->
1227  transfer_buffer);
1228 
1229  usb_free_urb(mos7840_port->write_urb_pool[j]);
1230  }
1231  }
1232 
1233  /* While closing port, shutdown all bulk read, write *
1234  * and interrupt read if they exists */
1235  if (serial->dev) {
1236  if (mos7840_port->write_urb) {
1237  dev_dbg(&port->dev, "%s", "Shutdown bulk write\n");
1238  usb_kill_urb(mos7840_port->write_urb);
1239  }
1240  if (mos7840_port->read_urb) {
1241  dev_dbg(&port->dev, "%s", "Shutdown bulk read\n");
1242  usb_kill_urb(mos7840_port->read_urb);
1243  mos7840_port->read_urb_busy = false;
1244  }
1245  if ((&mos7840_port->control_urb)) {
1246  dev_dbg(&port->dev, "%s", "Shutdown control read\n");
1247  /*/ usb_kill_urb (mos7840_port->control_urb); */
1248  }
1249  }
1250 /* if(mos7840_port->ctrl_buf != NULL) */
1251 /* kfree(mos7840_port->ctrl_buf); */
1252  port0->open_ports--;
1253  dev_dbg(&port->dev, "%s in close%d:in port%d\n", __func__, port0->open_ports, port->number);
1254  if (port0->open_ports == 0) {
1255  if (serial->port[0]->interrupt_in_urb) {
1256  dev_dbg(&port->dev, "Shutdown interrupt_in_urb\n");
1257  usb_kill_urb(serial->port[0]->interrupt_in_urb);
1258  }
1259  }
1260 
1261  if (mos7840_port->write_urb) {
1262  /* if this urb had a transfer buffer already (old tx) free it */
1263  if (mos7840_port->write_urb->transfer_buffer != NULL)
1264  kfree(mos7840_port->write_urb->transfer_buffer);
1265  usb_free_urb(mos7840_port->write_urb);
1266  }
1267 
1268  Data = 0x0;
1269  mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER, Data);
1270 
1271  Data = 0x00;
1272  mos7840_set_uart_reg(port, INTERRUPT_ENABLE_REGISTER, Data);
1273 
1274  mos7840_port->open = 0;
1275 }
1276 
1277 /************************************************************************
1278  *
1279  * mos7840_block_until_chase_response
1280  *
1281  * This function will block the close until one of the following:
1282  * 1. Response to our Chase comes from mos7840
1283  * 2. A timeout of 10 seconds without activity has expired
1284  * (1K of mos7840 data @ 2400 baud ==> 4 sec to empty)
1285  *
1286  ************************************************************************/
1287 
1288 static void mos7840_block_until_chase_response(struct tty_struct *tty,
1289  struct moschip_port *mos7840_port)
1290 {
1291  int timeout = msecs_to_jiffies(1000);
1292  int wait = 10;
1293  int count;
1294 
1295  while (1) {
1296  count = mos7840_chars_in_buffer(tty);
1297 
1298  /* Check for Buffer status */
1299  if (count <= 0)
1300  return;
1301 
1302  /* Block the thread for a while */
1303  interruptible_sleep_on_timeout(&mos7840_port->wait_chase,
1304  timeout);
1305  /* No activity.. count down section */
1306  wait--;
1307  if (wait == 0) {
1308  dev_dbg(&mos7840_port->port->dev, "%s - TIMEOUT\n", __func__);
1309  return;
1310  } else {
1311  /* Reset timeout value back to seconds */
1312  wait = 10;
1313  }
1314  }
1315 
1316 }
1317 
1318 /*****************************************************************************
1319  * mos7840_break
1320  * this function sends a break to the port
1321  *****************************************************************************/
1322 static void mos7840_break(struct tty_struct *tty, int break_state)
1323 {
1324  struct usb_serial_port *port = tty->driver_data;
1325  unsigned char data;
1326  struct usb_serial *serial;
1327  struct moschip_port *mos7840_port;
1328 
1329  if (mos7840_port_paranoia_check(port, __func__))
1330  return;
1331 
1332  serial = mos7840_get_usb_serial(port, __func__);
1333  if (!serial)
1334  return;
1335 
1336  mos7840_port = mos7840_get_port_private(port);
1337 
1338  if (mos7840_port == NULL)
1339  return;
1340 
1341  if (serial->dev)
1342  /* flush and block until tx is empty */
1343  mos7840_block_until_chase_response(tty, mos7840_port);
1344 
1345  if (break_state == -1)
1346  data = mos7840_port->shadowLCR | LCR_SET_BREAK;
1347  else
1348  data = mos7840_port->shadowLCR & ~LCR_SET_BREAK;
1349 
1350  /* FIXME: no locking on shadowLCR anywhere in driver */
1351  mos7840_port->shadowLCR = data;
1352  dev_dbg(&port->dev, "%s mos7840_port->shadowLCR is %x\n", __func__, mos7840_port->shadowLCR);
1353  mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER,
1354  mos7840_port->shadowLCR);
1355 }
1356 
1357 /*****************************************************************************
1358  * mos7840_write_room
1359  * this function is called by the tty driver when it wants to know how many
1360  * bytes of data we can accept for a specific port.
1361  * If successful, we return the amount of room that we have for this port
1362  * Otherwise we return a negative error number.
1363  *****************************************************************************/
1364 
1365 static int mos7840_write_room(struct tty_struct *tty)
1366 {
1367  struct usb_serial_port *port = tty->driver_data;
1368  int i;
1369  int room = 0;
1370  unsigned long flags;
1371  struct moschip_port *mos7840_port;
1372 
1373  if (mos7840_port_paranoia_check(port, __func__))
1374  return -1;
1375 
1376  mos7840_port = mos7840_get_port_private(port);
1377  if (mos7840_port == NULL)
1378  return -1;
1379 
1380  spin_lock_irqsave(&mos7840_port->pool_lock, flags);
1381  for (i = 0; i < NUM_URBS; ++i) {
1382  if (!mos7840_port->busy[i])
1383  room += URB_TRANSFER_BUFFER_SIZE;
1384  }
1385  spin_unlock_irqrestore(&mos7840_port->pool_lock, flags);
1386 
1387  room = (room == 0) ? 0 : room - URB_TRANSFER_BUFFER_SIZE + 1;
1388  dev_dbg(&mos7840_port->port->dev, "%s - returns %d\n", __func__, room);
1389  return room;
1390 
1391 }
1392 
1393 /*****************************************************************************
1394  * mos7840_write
1395  * this function is called by the tty driver when data should be written to
1396  * the port.
1397  * If successful, we return the number of bytes written, otherwise we
1398  * return a negative error number.
1399  *****************************************************************************/
1400 
1401 static int mos7840_write(struct tty_struct *tty, struct usb_serial_port *port,
1402  const unsigned char *data, int count)
1403 {
1404  int status;
1405  int i;
1406  int bytes_sent = 0;
1407  int transfer_size;
1408  unsigned long flags;
1409 
1410  struct moschip_port *mos7840_port;
1411  struct usb_serial *serial;
1412  struct urb *urb;
1413  /* __u16 Data; */
1414  const unsigned char *current_position = data;
1415  unsigned char *data1;
1416 
1417 #ifdef NOTMOS7840
1418  Data = 0x00;
1419  status = mos7840_get_uart_reg(port, LINE_CONTROL_REGISTER, &Data);
1420  mos7840_port->shadowLCR = Data;
1421  dev_dbg(&port->dev, "%s: LINE_CONTROL_REGISTER is %x\n", __func__, Data);
1422  dev_dbg(&port->dev, "%s: mos7840_port->shadowLCR is %x\n", __func__, mos7840_port->shadowLCR);
1423 
1424  /* Data = 0x03; */
1425  /* status = mos7840_set_uart_reg(port,LINE_CONTROL_REGISTER,Data); */
1426  /* mos7840_port->shadowLCR=Data;//Need to add later */
1427 
1428  Data |= SERIAL_LCR_DLAB; /* data latch enable in LCR 0x80 */
1429  status = mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data);
1430 
1431  /* Data = 0x0c; */
1432  /* status = mos7840_set_uart_reg(port,DIVISOR_LATCH_LSB,Data); */
1433  Data = 0x00;
1434  status = mos7840_get_uart_reg(port, DIVISOR_LATCH_LSB, &Data);
1435  dev_dbg(&port->dev, "%s: DLL value is %x\n", __func__, Data);
1436 
1437  Data = 0x0;
1438  status = mos7840_get_uart_reg(port, DIVISOR_LATCH_MSB, &Data);
1439  dev_dbg(&port->dev, "%s: DLM value is %x\n", __func__, Data);
1440 
1441  Data = Data & ~SERIAL_LCR_DLAB;
1442  dev_dbg(&port->dev, "%s: mos7840_port->shadowLCR is %x\n", __func__, mos7840_port->shadowLCR);
1443  status = mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data);
1444 #endif
1445 
1446  if (mos7840_port_paranoia_check(port, __func__))
1447  return -1;
1448 
1449  serial = port->serial;
1450  if (mos7840_serial_paranoia_check(serial, __func__))
1451  return -1;
1452 
1453  mos7840_port = mos7840_get_port_private(port);
1454  if (mos7840_port == NULL)
1455  return -1;
1456 
1457  /* try to find a free urb in the list */
1458  urb = NULL;
1459 
1460  spin_lock_irqsave(&mos7840_port->pool_lock, flags);
1461  for (i = 0; i < NUM_URBS; ++i) {
1462  if (!mos7840_port->busy[i]) {
1463  mos7840_port->busy[i] = 1;
1464  urb = mos7840_port->write_urb_pool[i];
1465  dev_dbg(&port->dev, "URB:%d\n", i);
1466  break;
1467  }
1468  }
1469  spin_unlock_irqrestore(&mos7840_port->pool_lock, flags);
1470 
1471  if (urb == NULL) {
1472  dev_dbg(&port->dev, "%s - no more free urbs\n", __func__);
1473  goto exit;
1474  }
1475 
1476  if (urb->transfer_buffer == NULL) {
1477  urb->transfer_buffer =
1478  kmalloc(URB_TRANSFER_BUFFER_SIZE, GFP_KERNEL);
1479 
1480  if (urb->transfer_buffer == NULL) {
1481  dev_err_console(port, "%s no more kernel memory...\n",
1482  __func__);
1483  goto exit;
1484  }
1485  }
1486  transfer_size = min(count, URB_TRANSFER_BUFFER_SIZE);
1487 
1488  memcpy(urb->transfer_buffer, current_position, transfer_size);
1489 
1490  /* fill urb with data and submit */
1491  if ((serial->num_ports == 2)
1492  && ((((__u16)port->number -
1493  (__u16)(port->serial->minor)) % 2) != 0)) {
1494  usb_fill_bulk_urb(urb,
1495  serial->dev,
1496  usb_sndbulkpipe(serial->dev,
1497  (port->bulk_out_endpointAddress) + 2),
1498  urb->transfer_buffer,
1499  transfer_size,
1500  mos7840_bulk_out_data_callback, mos7840_port);
1501  } else {
1502  usb_fill_bulk_urb(urb,
1503  serial->dev,
1504  usb_sndbulkpipe(serial->dev,
1505  port->bulk_out_endpointAddress),
1506  urb->transfer_buffer,
1507  transfer_size,
1508  mos7840_bulk_out_data_callback, mos7840_port);
1509  }
1510 
1511  data1 = urb->transfer_buffer;
1512  dev_dbg(&port->dev, "bulkout endpoint is %d\n", port->bulk_out_endpointAddress);
1513 
1514  /* Turn on LED */
1515  if (mos7840_port->has_led && !mos7840_port->led_flag) {
1516  mos7840_port->led_flag = true;
1517  mos7840_set_led_sync(port, MODEM_CONTROL_REGISTER, 0x0301);
1518  mod_timer(&mos7840_port->led_timer1,
1519  jiffies + msecs_to_jiffies(LED_ON_MS));
1520  }
1521 
1522  /* send it down the pipe */
1523  status = usb_submit_urb(urb, GFP_ATOMIC);
1524 
1525  if (status) {
1526  mos7840_port->busy[i] = 0;
1527  dev_err_console(port, "%s - usb_submit_urb(write bulk) failed "
1528  "with status = %d\n", __func__, status);
1529  bytes_sent = status;
1530  goto exit;
1531  }
1532  bytes_sent = transfer_size;
1533  mos7840_port->icount.tx += transfer_size;
1534  smp_wmb();
1535  dev_dbg(&port->dev, "mos7840_port->icount.tx is %d:\n", mos7840_port->icount.tx);
1536 exit:
1537  return bytes_sent;
1538 
1539 }
1540 
1541 /*****************************************************************************
1542  * mos7840_throttle
1543  * this function is called by the tty driver when it wants to stop the data
1544  * being read from the port.
1545  *****************************************************************************/
1546 
1547 static void mos7840_throttle(struct tty_struct *tty)
1548 {
1549  struct usb_serial_port *port = tty->driver_data;
1550  struct moschip_port *mos7840_port;
1551  int status;
1552 
1553  if (mos7840_port_paranoia_check(port, __func__))
1554  return;
1555 
1556  mos7840_port = mos7840_get_port_private(port);
1557 
1558  if (mos7840_port == NULL)
1559  return;
1560 
1561  if (!mos7840_port->open) {
1562  dev_dbg(&port->dev, "%s", "port not opened\n");
1563  return;
1564  }
1565 
1566  /* if we are implementing XON/XOFF, send the stop character */
1567  if (I_IXOFF(tty)) {
1568  unsigned char stop_char = STOP_CHAR(tty);
1569  status = mos7840_write(tty, port, &stop_char, 1);
1570  if (status <= 0)
1571  return;
1572  }
1573  /* if we are implementing RTS/CTS, toggle that line */
1574  if (tty->termios.c_cflag & CRTSCTS) {
1575  mos7840_port->shadowMCR &= ~MCR_RTS;
1576  status = mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER,
1577  mos7840_port->shadowMCR);
1578  if (status < 0)
1579  return;
1580  }
1581 }
1582 
1583 /*****************************************************************************
1584  * mos7840_unthrottle
1585  * this function is called by the tty driver when it wants to resume
1586  * the data being read from the port (called after mos7840_throttle is
1587  * called)
1588  *****************************************************************************/
1589 static void mos7840_unthrottle(struct tty_struct *tty)
1590 {
1591  struct usb_serial_port *port = tty->driver_data;
1592  int status;
1593  struct moschip_port *mos7840_port = mos7840_get_port_private(port);
1594 
1595  if (mos7840_port_paranoia_check(port, __func__))
1596  return;
1597 
1598  if (mos7840_port == NULL)
1599  return;
1600 
1601  if (!mos7840_port->open) {
1602  dev_dbg(&port->dev, "%s - port not opened\n", __func__);
1603  return;
1604  }
1605 
1606  /* if we are implementing XON/XOFF, send the start character */
1607  if (I_IXOFF(tty)) {
1608  unsigned char start_char = START_CHAR(tty);
1609  status = mos7840_write(tty, port, &start_char, 1);
1610  if (status <= 0)
1611  return;
1612  }
1613 
1614  /* if we are implementing RTS/CTS, toggle that line */
1615  if (tty->termios.c_cflag & CRTSCTS) {
1616  mos7840_port->shadowMCR |= MCR_RTS;
1617  status = mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER,
1618  mos7840_port->shadowMCR);
1619  if (status < 0)
1620  return;
1621  }
1622 }
1623 
1624 static int mos7840_tiocmget(struct tty_struct *tty)
1625 {
1626  struct usb_serial_port *port = tty->driver_data;
1627  struct moschip_port *mos7840_port;
1628  unsigned int result;
1629  __u16 msr;
1630  __u16 mcr;
1631  int status;
1632  mos7840_port = mos7840_get_port_private(port);
1633 
1634  if (mos7840_port == NULL)
1635  return -ENODEV;
1636 
1637  status = mos7840_get_uart_reg(port, MODEM_STATUS_REGISTER, &msr);
1638  status = mos7840_get_uart_reg(port, MODEM_CONTROL_REGISTER, &mcr);
1639  result = ((mcr & MCR_DTR) ? TIOCM_DTR : 0)
1640  | ((mcr & MCR_RTS) ? TIOCM_RTS : 0)
1641  | ((mcr & MCR_LOOPBACK) ? TIOCM_LOOP : 0)
1642  | ((msr & MOS7840_MSR_CTS) ? TIOCM_CTS : 0)
1643  | ((msr & MOS7840_MSR_CD) ? TIOCM_CAR : 0)
1644  | ((msr & MOS7840_MSR_RI) ? TIOCM_RI : 0)
1645  | ((msr & MOS7840_MSR_DSR) ? TIOCM_DSR : 0);
1646 
1647  dev_dbg(&port->dev, "%s - 0x%04X\n", __func__, result);
1648 
1649  return result;
1650 }
1651 
1652 static int mos7840_tiocmset(struct tty_struct *tty,
1653  unsigned int set, unsigned int clear)
1654 {
1655  struct usb_serial_port *port = tty->driver_data;
1656  struct moschip_port *mos7840_port;
1657  unsigned int mcr;
1658  int status;
1659 
1660  mos7840_port = mos7840_get_port_private(port);
1661 
1662  if (mos7840_port == NULL)
1663  return -ENODEV;
1664 
1665  /* FIXME: What locks the port registers ? */
1666  mcr = mos7840_port->shadowMCR;
1667  if (clear & TIOCM_RTS)
1668  mcr &= ~MCR_RTS;
1669  if (clear & TIOCM_DTR)
1670  mcr &= ~MCR_DTR;
1671  if (clear & TIOCM_LOOP)
1672  mcr &= ~MCR_LOOPBACK;
1673 
1674  if (set & TIOCM_RTS)
1675  mcr |= MCR_RTS;
1676  if (set & TIOCM_DTR)
1677  mcr |= MCR_DTR;
1678  if (set & TIOCM_LOOP)
1679  mcr |= MCR_LOOPBACK;
1680 
1681  mos7840_port->shadowMCR = mcr;
1682 
1683  status = mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER, mcr);
1684  if (status < 0) {
1685  dev_dbg(&port->dev, "setting MODEM_CONTROL_REGISTER Failed\n");
1686  return status;
1687  }
1688 
1689  return 0;
1690 }
1691 
1692 /*****************************************************************************
1693  * mos7840_calc_baud_rate_divisor
1694  * this function calculates the proper baud rate divisor for the specified
1695  * baud rate.
1696  *****************************************************************************/
1697 static int mos7840_calc_baud_rate_divisor(struct usb_serial_port *port,
1698  int baudRate, int *divisor,
1699  __u16 *clk_sel_val)
1700 {
1701  dev_dbg(&port->dev, "%s - %d\n", __func__, baudRate);
1702 
1703  if (baudRate <= 115200) {
1704  *divisor = 115200 / baudRate;
1705  *clk_sel_val = 0x0;
1706  }
1707  if ((baudRate > 115200) && (baudRate <= 230400)) {
1708  *divisor = 230400 / baudRate;
1709  *clk_sel_val = 0x10;
1710  } else if ((baudRate > 230400) && (baudRate <= 403200)) {
1711  *divisor = 403200 / baudRate;
1712  *clk_sel_val = 0x20;
1713  } else if ((baudRate > 403200) && (baudRate <= 460800)) {
1714  *divisor = 460800 / baudRate;
1715  *clk_sel_val = 0x30;
1716  } else if ((baudRate > 460800) && (baudRate <= 806400)) {
1717  *divisor = 806400 / baudRate;
1718  *clk_sel_val = 0x40;
1719  } else if ((baudRate > 806400) && (baudRate <= 921600)) {
1720  *divisor = 921600 / baudRate;
1721  *clk_sel_val = 0x50;
1722  } else if ((baudRate > 921600) && (baudRate <= 1572864)) {
1723  *divisor = 1572864 / baudRate;
1724  *clk_sel_val = 0x60;
1725  } else if ((baudRate > 1572864) && (baudRate <= 3145728)) {
1726  *divisor = 3145728 / baudRate;
1727  *clk_sel_val = 0x70;
1728  }
1729  return 0;
1730 
1731 #ifdef NOTMCS7840
1732 
1733  for (i = 0; i < ARRAY_SIZE(mos7840_divisor_table); i++) {
1734  if (mos7840_divisor_table[i].BaudRate == baudrate) {
1735  *divisor = mos7840_divisor_table[i].Divisor;
1736  return 0;
1737  }
1738  }
1739 
1740  /* After trying for all the standard baud rates *
1741  * Try calculating the divisor for this baud rate */
1742 
1743  if (baudrate > 75 && baudrate < 230400) {
1744  /* get the divisor */
1745  custom = (__u16) (230400L / baudrate);
1746 
1747  /* Check for round off */
1748  round1 = (__u16) (2304000L / baudrate);
1749  round = (__u16) (round1 - (custom * 10));
1750  if (round > 4)
1751  custom++;
1752  *divisor = custom;
1753 
1754  dev_dbg(&port->dev, " Baud %d = %d\n", baudrate, custom);
1755  return 0;
1756  }
1757 
1758  dev_dbg(&port->dev, "%s", " Baud calculation Failed...\n");
1759  return -1;
1760 #endif
1761 }
1762 
1763 /*****************************************************************************
1764  * mos7840_send_cmd_write_baud_rate
1765  * this function sends the proper command to change the baud rate of the
1766  * specified port.
1767  *****************************************************************************/
1768 
1769 static int mos7840_send_cmd_write_baud_rate(struct moschip_port *mos7840_port,
1770  int baudRate)
1771 {
1772  int divisor = 0;
1773  int status;
1774  __u16 Data;
1775  unsigned char number;
1776  __u16 clk_sel_val;
1777  struct usb_serial_port *port;
1778 
1779  if (mos7840_port == NULL)
1780  return -1;
1781 
1782  port = mos7840_port->port;
1783  if (mos7840_port_paranoia_check(port, __func__))
1784  return -1;
1785 
1786  if (mos7840_serial_paranoia_check(port->serial, __func__))
1787  return -1;
1788 
1789  number = mos7840_port->port->number - mos7840_port->port->serial->minor;
1790 
1791  dev_dbg(&port->dev, "%s - port = %d, baud = %d\n", __func__,
1792  mos7840_port->port->number, baudRate);
1793  /* reset clk_uart_sel in spregOffset */
1794  if (baudRate > 115200) {
1795 #ifdef HW_flow_control
1796  /* NOTE: need to see the pther register to modify */
1797  /* setting h/w flow control bit to 1 */
1798  Data = 0x2b;
1799  mos7840_port->shadowMCR = Data;
1800  status = mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER,
1801  Data);
1802  if (status < 0) {
1803  dev_dbg(&port->dev, "Writing spreg failed in set_serial_baud\n");
1804  return -1;
1805  }
1806 #endif
1807 
1808  } else {
1809 #ifdef HW_flow_control
1810  /* setting h/w flow control bit to 0 */
1811  Data = 0xb;
1812  mos7840_port->shadowMCR = Data;
1813  status = mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER,
1814  Data);
1815  if (status < 0) {
1816  dev_dbg(&port->dev, "Writing spreg failed in set_serial_baud\n");
1817  return -1;
1818  }
1819 #endif
1820 
1821  }
1822 
1823  if (1) { /* baudRate <= 115200) */
1824  clk_sel_val = 0x0;
1825  Data = 0x0;
1826  status = mos7840_calc_baud_rate_divisor(port, baudRate, &divisor,
1827  &clk_sel_val);
1828  status = mos7840_get_reg_sync(port, mos7840_port->SpRegOffset,
1829  &Data);
1830  if (status < 0) {
1831  dev_dbg(&port->dev, "reading spreg failed in set_serial_baud\n");
1832  return -1;
1833  }
1834  Data = (Data & 0x8f) | clk_sel_val;
1835  status = mos7840_set_reg_sync(port, mos7840_port->SpRegOffset,
1836  Data);
1837  if (status < 0) {
1838  dev_dbg(&port->dev, "Writing spreg failed in set_serial_baud\n");
1839  return -1;
1840  }
1841  /* Calculate the Divisor */
1842 
1843  if (status) {
1844  dev_err(&port->dev, "%s - bad baud rate\n", __func__);
1845  return status;
1846  }
1847  /* Enable access to divisor latch */
1848  Data = mos7840_port->shadowLCR | SERIAL_LCR_DLAB;
1849  mos7840_port->shadowLCR = Data;
1850  mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data);
1851 
1852  /* Write the divisor */
1853  Data = (unsigned char)(divisor & 0xff);
1854  dev_dbg(&port->dev, "set_serial_baud Value to write DLL is %x\n", Data);
1855  mos7840_set_uart_reg(port, DIVISOR_LATCH_LSB, Data);
1856 
1857  Data = (unsigned char)((divisor & 0xff00) >> 8);
1858  dev_dbg(&port->dev, "set_serial_baud Value to write DLM is %x\n", Data);
1859  mos7840_set_uart_reg(port, DIVISOR_LATCH_MSB, Data);
1860 
1861  /* Disable access to divisor latch */
1862  Data = mos7840_port->shadowLCR & ~SERIAL_LCR_DLAB;
1863  mos7840_port->shadowLCR = Data;
1864  mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data);
1865 
1866  }
1867  return status;
1868 }
1869 
1870 /*****************************************************************************
1871  * mos7840_change_port_settings
1872  * This routine is called to set the UART on the device to match
1873  * the specified new settings.
1874  *****************************************************************************/
1875 
1876 static void mos7840_change_port_settings(struct tty_struct *tty,
1877  struct moschip_port *mos7840_port, struct ktermios *old_termios)
1878 {
1879  int baud;
1880  unsigned cflag;
1881  unsigned iflag;
1882  __u8 lData;
1883  __u8 lParity;
1884  __u8 lStop;
1885  int status;
1886  __u16 Data;
1887  struct usb_serial_port *port;
1888  struct usb_serial *serial;
1889 
1890  if (mos7840_port == NULL)
1891  return;
1892 
1893  port = mos7840_port->port;
1894 
1895  if (mos7840_port_paranoia_check(port, __func__))
1896  return;
1897 
1898  if (mos7840_serial_paranoia_check(port->serial, __func__))
1899  return;
1900 
1901  serial = port->serial;
1902 
1903  if (!mos7840_port->open) {
1904  dev_dbg(&port->dev, "%s - port not opened\n", __func__);
1905  return;
1906  }
1907 
1908  lData = LCR_BITS_8;
1909  lStop = LCR_STOP_1;
1910  lParity = LCR_PAR_NONE;
1911 
1912  cflag = tty->termios.c_cflag;
1913  iflag = tty->termios.c_iflag;
1914 
1915  /* Change the number of bits */
1916  if (cflag & CSIZE) {
1917  switch (cflag & CSIZE) {
1918  case CS5:
1919  lData = LCR_BITS_5;
1920  break;
1921 
1922  case CS6:
1923  lData = LCR_BITS_6;
1924  break;
1925 
1926  case CS7:
1927  lData = LCR_BITS_7;
1928  break;
1929  default:
1930  case CS8:
1931  lData = LCR_BITS_8;
1932  break;
1933  }
1934  }
1935  /* Change the Parity bit */
1936  if (cflag & PARENB) {
1937  if (cflag & PARODD) {
1938  lParity = LCR_PAR_ODD;
1939  dev_dbg(&port->dev, "%s - parity = odd\n", __func__);
1940  } else {
1941  lParity = LCR_PAR_EVEN;
1942  dev_dbg(&port->dev, "%s - parity = even\n", __func__);
1943  }
1944 
1945  } else {
1946  dev_dbg(&port->dev, "%s - parity = none\n", __func__);
1947  }
1948 
1949  if (cflag & CMSPAR)
1950  lParity = lParity | 0x20;
1951 
1952  /* Change the Stop bit */
1953  if (cflag & CSTOPB) {
1954  lStop = LCR_STOP_2;
1955  dev_dbg(&port->dev, "%s - stop bits = 2\n", __func__);
1956  } else {
1957  lStop = LCR_STOP_1;
1958  dev_dbg(&port->dev, "%s - stop bits = 1\n", __func__);
1959  }
1960 
1961  /* Update the LCR with the correct value */
1962  mos7840_port->shadowLCR &=
1963  ~(LCR_BITS_MASK | LCR_STOP_MASK | LCR_PAR_MASK);
1964  mos7840_port->shadowLCR |= (lData | lParity | lStop);
1965 
1966  dev_dbg(&port->dev, "%s - mos7840_port->shadowLCR is %x\n", __func__,
1967  mos7840_port->shadowLCR);
1968  /* Disable Interrupts */
1969  Data = 0x00;
1970  mos7840_set_uart_reg(port, INTERRUPT_ENABLE_REGISTER, Data);
1971 
1972  Data = 0x00;
1973  mos7840_set_uart_reg(port, FIFO_CONTROL_REGISTER, Data);
1974 
1975  Data = 0xcf;
1976  mos7840_set_uart_reg(port, FIFO_CONTROL_REGISTER, Data);
1977 
1978  /* Send the updated LCR value to the mos7840 */
1979  Data = mos7840_port->shadowLCR;
1980 
1981  mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data);
1982 
1983  Data = 0x00b;
1984  mos7840_port->shadowMCR = Data;
1985  mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER, Data);
1986  Data = 0x00b;
1987  mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER, Data);
1988 
1989  /* set up the MCR register and send it to the mos7840 */
1990 
1991  mos7840_port->shadowMCR = MCR_MASTER_IE;
1992  if (cflag & CBAUD)
1993  mos7840_port->shadowMCR |= (MCR_DTR | MCR_RTS);
1994 
1995  if (cflag & CRTSCTS)
1996  mos7840_port->shadowMCR |= (MCR_XON_ANY);
1997  else
1998  mos7840_port->shadowMCR &= ~(MCR_XON_ANY);
1999 
2000  Data = mos7840_port->shadowMCR;
2001  mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER, Data);
2002 
2003  /* Determine divisor based on baud rate */
2004  baud = tty_get_baud_rate(tty);
2005 
2006  if (!baud) {
2007  /* pick a default, any default... */
2008  dev_dbg(&port->dev, "%s", "Picked default baud...\n");
2009  baud = 9600;
2010  }
2011 
2012  dev_dbg(&port->dev, "%s - baud rate = %d\n", __func__, baud);
2013  status = mos7840_send_cmd_write_baud_rate(mos7840_port, baud);
2014 
2015  /* Enable Interrupts */
2016  Data = 0x0c;
2017  mos7840_set_uart_reg(port, INTERRUPT_ENABLE_REGISTER, Data);
2018 
2019  if (mos7840_port->read_urb_busy == false) {
2020  mos7840_port->read_urb_busy = true;
2021  status = usb_submit_urb(mos7840_port->read_urb, GFP_ATOMIC);
2022  if (status) {
2023  dev_dbg(&port->dev, "usb_submit_urb(read bulk) failed, status = %d\n",
2024  status);
2025  mos7840_port->read_urb_busy = false;
2026  }
2027  }
2028  wake_up(&mos7840_port->delta_msr_wait);
2029  mos7840_port->delta_msr_cond = 1;
2030  dev_dbg(&port->dev, "%s - mos7840_port->shadowLCR is End %x\n", __func__,
2031  mos7840_port->shadowLCR);
2032 }
2033 
2034 /*****************************************************************************
2035  * mos7840_set_termios
2036  * this function is called by the tty driver when it wants to change
2037  * the termios structure
2038  *****************************************************************************/
2039 
2040 static void mos7840_set_termios(struct tty_struct *tty,
2041  struct usb_serial_port *port,
2042  struct ktermios *old_termios)
2043 {
2044  int status;
2045  unsigned int cflag;
2046  struct usb_serial *serial;
2047  struct moschip_port *mos7840_port;
2048 
2049  if (mos7840_port_paranoia_check(port, __func__))
2050  return;
2051 
2052  serial = port->serial;
2053 
2054  if (mos7840_serial_paranoia_check(serial, __func__))
2055  return;
2056 
2057  mos7840_port = mos7840_get_port_private(port);
2058 
2059  if (mos7840_port == NULL)
2060  return;
2061 
2062  if (!mos7840_port->open) {
2063  dev_dbg(&port->dev, "%s - port not opened\n", __func__);
2064  return;
2065  }
2066 
2067  dev_dbg(&port->dev, "%s", "setting termios - \n");
2068 
2069  cflag = tty->termios.c_cflag;
2070 
2071  dev_dbg(&port->dev, "%s - clfag %08x iflag %08x\n", __func__,
2072  tty->termios.c_cflag, RELEVANT_IFLAG(tty->termios.c_iflag));
2073  dev_dbg(&port->dev, "%s - old clfag %08x old iflag %08x\n", __func__,
2074  old_termios->c_cflag, RELEVANT_IFLAG(old_termios->c_iflag));
2075  dev_dbg(&port->dev, "%s - port %d\n", __func__, port->number);
2076 
2077  /* change the port settings to the new ones specified */
2078 
2079  mos7840_change_port_settings(tty, mos7840_port, old_termios);
2080 
2081  if (!mos7840_port->read_urb) {
2082  dev_dbg(&port->dev, "%s", "URB KILLED !!!!!\n");
2083  return;
2084  }
2085 
2086  if (mos7840_port->read_urb_busy == false) {
2087  mos7840_port->read_urb_busy = true;
2088  status = usb_submit_urb(mos7840_port->read_urb, GFP_ATOMIC);
2089  if (status) {
2090  dev_dbg(&port->dev, "usb_submit_urb(read bulk) failed, status = %d\n",
2091  status);
2092  mos7840_port->read_urb_busy = false;
2093  }
2094  }
2095 }
2096 
2097 /*****************************************************************************
2098  * mos7840_get_lsr_info - get line status register info
2099  *
2100  * Purpose: Let user call ioctl() to get info when the UART physically
2101  * is emptied. On bus types like RS485, the transmitter must
2102  * release the bus after transmitting. This must be done when
2103  * the transmit shift register is empty, not be done when the
2104  * transmit holding register is empty. This functionality
2105  * allows an RS485 driver to be written in user space.
2106  *****************************************************************************/
2107 
2108 static int mos7840_get_lsr_info(struct tty_struct *tty,
2109  unsigned int __user *value)
2110 {
2111  int count;
2112  unsigned int result = 0;
2113 
2114  count = mos7840_chars_in_buffer(tty);
2115  if (count == 0)
2116  result = TIOCSER_TEMT;
2117 
2118  if (copy_to_user(value, &result, sizeof(int)))
2119  return -EFAULT;
2120  return 0;
2121 }
2122 
2123 /*****************************************************************************
2124  * mos7840_get_serial_info
2125  * function to get information about serial port
2126  *****************************************************************************/
2127 
2128 static int mos7840_get_serial_info(struct moschip_port *mos7840_port,
2129  struct serial_struct __user *retinfo)
2130 {
2131  struct serial_struct tmp;
2132 
2133  if (mos7840_port == NULL)
2134  return -1;
2135 
2136  if (!retinfo)
2137  return -EFAULT;
2138 
2139  memset(&tmp, 0, sizeof(tmp));
2140 
2141  tmp.type = PORT_16550A;
2142  tmp.line = mos7840_port->port->serial->minor;
2143  tmp.port = mos7840_port->port->number;
2144  tmp.irq = 0;
2145  tmp.flags = ASYNC_SKIP_TEST | ASYNC_AUTO_IRQ;
2146  tmp.xmit_fifo_size = NUM_URBS * URB_TRANSFER_BUFFER_SIZE;
2147  tmp.baud_base = 9600;
2148  tmp.close_delay = 5 * HZ;
2149  tmp.closing_wait = 30 * HZ;
2150 
2151  if (copy_to_user(retinfo, &tmp, sizeof(*retinfo)))
2152  return -EFAULT;
2153  return 0;
2154 }
2155 
2156 static int mos7840_get_icount(struct tty_struct *tty,
2157  struct serial_icounter_struct *icount)
2158 {
2159  struct usb_serial_port *port = tty->driver_data;
2160  struct moschip_port *mos7840_port;
2161  struct async_icount cnow;
2162 
2163  mos7840_port = mos7840_get_port_private(port);
2164  cnow = mos7840_port->icount;
2165 
2166  smp_rmb();
2167  icount->cts = cnow.cts;
2168  icount->dsr = cnow.dsr;
2169  icount->rng = cnow.rng;
2170  icount->dcd = cnow.dcd;
2171  icount->rx = cnow.rx;
2172  icount->tx = cnow.tx;
2173  icount->frame = cnow.frame;
2174  icount->overrun = cnow.overrun;
2175  icount->parity = cnow.parity;
2176  icount->brk = cnow.brk;
2177  icount->buf_overrun = cnow.buf_overrun;
2178 
2179  dev_dbg(&port->dev, "%s TIOCGICOUNT RX=%d, TX=%d\n", __func__,
2180  icount->rx, icount->tx);
2181  return 0;
2182 }
2183 
2184 /*****************************************************************************
2185  * SerialIoctl
2186  * this function handles any ioctl calls to the driver
2187  *****************************************************************************/
2188 
2189 static int mos7840_ioctl(struct tty_struct *tty,
2190  unsigned int cmd, unsigned long arg)
2191 {
2192  struct usb_serial_port *port = tty->driver_data;
2193  void __user *argp = (void __user *)arg;
2194  struct moschip_port *mos7840_port;
2195 
2196  struct async_icount cnow;
2197  struct async_icount cprev;
2198 
2199  if (mos7840_port_paranoia_check(port, __func__))
2200  return -1;
2201 
2202  mos7840_port = mos7840_get_port_private(port);
2203 
2204  if (mos7840_port == NULL)
2205  return -1;
2206 
2207  dev_dbg(&port->dev, "%s - cmd = 0x%x\n", __func__, cmd);
2208 
2209  switch (cmd) {
2210  /* return number of bytes available */
2211 
2212  case TIOCSERGETLSR:
2213  dev_dbg(&port->dev, "%s TIOCSERGETLSR\n", __func__);
2214  return mos7840_get_lsr_info(tty, argp);
2215 
2216  case TIOCGSERIAL:
2217  dev_dbg(&port->dev, "%s TIOCGSERIAL\n", __func__);
2218  return mos7840_get_serial_info(mos7840_port, argp);
2219 
2220  case TIOCSSERIAL:
2221  dev_dbg(&port->dev, "%s TIOCSSERIAL\n", __func__);
2222  break;
2223 
2224  case TIOCMIWAIT:
2225  dev_dbg(&port->dev, "%s TIOCMIWAIT\n", __func__);
2226  cprev = mos7840_port->icount;
2227  while (1) {
2228  /* interruptible_sleep_on(&mos7840_port->delta_msr_wait); */
2229  mos7840_port->delta_msr_cond = 0;
2230  wait_event_interruptible(mos7840_port->delta_msr_wait,
2231  (mos7840_port->
2232  delta_msr_cond == 1));
2233 
2234  /* see if a signal did it */
2235  if (signal_pending(current))
2236  return -ERESTARTSYS;
2237  cnow = mos7840_port->icount;
2238  smp_rmb();
2239  if (cnow.rng == cprev.rng && cnow.dsr == cprev.dsr &&
2240  cnow.dcd == cprev.dcd && cnow.cts == cprev.cts)
2241  return -EIO; /* no change => error */
2242  if (((arg & TIOCM_RNG) && (cnow.rng != cprev.rng)) ||
2243  ((arg & TIOCM_DSR) && (cnow.dsr != cprev.dsr)) ||
2244  ((arg & TIOCM_CD) && (cnow.dcd != cprev.dcd)) ||
2245  ((arg & TIOCM_CTS) && (cnow.cts != cprev.cts))) {
2246  return 0;
2247  }
2248  cprev = cnow;
2249  }
2250  /* NOTREACHED */
2251  break;
2252 
2253  default:
2254  break;
2255  }
2256  return -ENOIOCTLCMD;
2257 }
2258 
2259 static int mos7810_check(struct usb_serial *serial)
2260 {
2261  int i, pass_count = 0;
2262  __u16 data = 0, mcr_data = 0;
2263  __u16 test_pattern = 0x55AA;
2264 
2265  /* Store MCR setting */
2266  usb_control_msg(serial->dev, usb_rcvctrlpipe(serial->dev, 0),
2267  MCS_RDREQ, MCS_RD_RTYPE, 0x0300, MODEM_CONTROL_REGISTER,
2268  &mcr_data, VENDOR_READ_LENGTH, MOS_WDR_TIMEOUT);
2269 
2270  for (i = 0; i < 16; i++) {
2271  /* Send the 1-bit test pattern out to MCS7810 test pin */
2272  usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0),
2273  MCS_WRREQ, MCS_WR_RTYPE,
2274  (0x0300 | (((test_pattern >> i) & 0x0001) << 1)),
2275  MODEM_CONTROL_REGISTER, NULL, 0, MOS_WDR_TIMEOUT);
2276 
2277  /* Read the test pattern back */
2278  usb_control_msg(serial->dev, usb_rcvctrlpipe(serial->dev, 0),
2279  MCS_RDREQ, MCS_RD_RTYPE, 0, GPIO_REGISTER, &data,
2280  VENDOR_READ_LENGTH, MOS_WDR_TIMEOUT);
2281 
2282  /* If this is a MCS7810 device, both test patterns must match */
2283  if (((test_pattern >> i) ^ (~data >> 1)) & 0x0001)
2284  break;
2285 
2286  pass_count++;
2287  }
2288 
2289  /* Restore MCR setting */
2290  usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0), MCS_WRREQ,
2291  MCS_WR_RTYPE, 0x0300 | mcr_data, MODEM_CONTROL_REGISTER, NULL,
2292  0, MOS_WDR_TIMEOUT);
2293 
2294  if (pass_count == 16)
2295  return 1;
2296 
2297  return 0;
2298 }
2299 
2300 static int mos7840_calc_num_ports(struct usb_serial *serial)
2301 {
2302  __u16 data = 0x00;
2303  int mos7840_num_ports;
2304 
2305  usb_control_msg(serial->dev, usb_rcvctrlpipe(serial->dev, 0),
2306  MCS_RDREQ, MCS_RD_RTYPE, 0, GPIO_REGISTER, &data,
2307  VENDOR_READ_LENGTH, MOS_WDR_TIMEOUT);
2308 
2309  if (serial->dev->descriptor.idProduct == MOSCHIP_DEVICE_ID_7810 ||
2310  serial->dev->descriptor.idProduct == MOSCHIP_DEVICE_ID_7820) {
2311  device_type = serial->dev->descriptor.idProduct;
2312  } else {
2313  /* For a MCS7840 device GPIO0 must be set to 1 */
2314  if ((data & 0x01) == 1)
2315  device_type = MOSCHIP_DEVICE_ID_7840;
2316  else if (mos7810_check(serial))
2317  device_type = MOSCHIP_DEVICE_ID_7810;
2318  else
2319  device_type = MOSCHIP_DEVICE_ID_7820;
2320  }
2321 
2322  mos7840_num_ports = (device_type >> 4) & 0x000F;
2323  serial->num_bulk_in = mos7840_num_ports;
2324  serial->num_bulk_out = mos7840_num_ports;
2325  serial->num_ports = mos7840_num_ports;
2326 
2327  return mos7840_num_ports;
2328 }
2329 
2330 static int mos7840_port_probe(struct usb_serial_port *port)
2331 {
2332  struct usb_serial *serial = port->serial;
2333  struct moschip_port *mos7840_port;
2334  int status;
2335  int pnum;
2336  __u16 Data;
2337 
2338  /* we set up the pointers to the endpoints in the mos7840_open *
2339  * function, as the structures aren't created yet. */
2340 
2341  pnum = port->number - serial->minor;
2342 
2343  dev_dbg(&port->dev, "mos7840_startup: configuring port %d\n", pnum);
2344  mos7840_port = kzalloc(sizeof(struct moschip_port), GFP_KERNEL);
2345  if (mos7840_port == NULL) {
2346  dev_err(&port->dev, "%s - Out of memory\n", __func__);
2347  return -ENOMEM;
2348  }
2349 
2350  /* Initialize all port interrupt end point to port 0 int
2351  * endpoint. Our device has only one interrupt end point
2352  * common to all port */
2353 
2354  mos7840_port->port = port;
2355  mos7840_set_port_private(port, mos7840_port);
2356  spin_lock_init(&mos7840_port->pool_lock);
2357 
2358  /* minor is not initialised until later by
2359  * usb-serial.c:get_free_serial() and cannot therefore be used
2360  * to index device instances */
2361  mos7840_port->port_num = pnum + 1;
2362  dev_dbg(&port->dev, "port->number = %d\n", port->number);
2363  dev_dbg(&port->dev, "port->serial->minor = %d\n", port->serial->minor);
2364  dev_dbg(&port->dev, "mos7840_port->port_num = %d\n", mos7840_port->port_num);
2365  dev_dbg(&port->dev, "serial->minor = %d\n", serial->minor);
2366 
2367  if (mos7840_port->port_num == 1) {
2368  mos7840_port->SpRegOffset = 0x0;
2369  mos7840_port->ControlRegOffset = 0x1;
2370  mos7840_port->DcrRegOffset = 0x4;
2371  } else if ((mos7840_port->port_num == 2) && (serial->num_ports == 4)) {
2372  mos7840_port->SpRegOffset = 0x8;
2373  mos7840_port->ControlRegOffset = 0x9;
2374  mos7840_port->DcrRegOffset = 0x16;
2375  } else if ((mos7840_port->port_num == 2) && (serial->num_ports == 2)) {
2376  mos7840_port->SpRegOffset = 0xa;
2377  mos7840_port->ControlRegOffset = 0xb;
2378  mos7840_port->DcrRegOffset = 0x19;
2379  } else if ((mos7840_port->port_num == 3) && (serial->num_ports == 4)) {
2380  mos7840_port->SpRegOffset = 0xa;
2381  mos7840_port->ControlRegOffset = 0xb;
2382  mos7840_port->DcrRegOffset = 0x19;
2383  } else if ((mos7840_port->port_num == 4) && (serial->num_ports == 4)) {
2384  mos7840_port->SpRegOffset = 0xc;
2385  mos7840_port->ControlRegOffset = 0xd;
2386  mos7840_port->DcrRegOffset = 0x1c;
2387  }
2388  mos7840_dump_serial_port(port, mos7840_port);
2389  mos7840_set_port_private(port, mos7840_port);
2390 
2391  /* enable rx_disable bit in control register */
2392  status = mos7840_get_reg_sync(port,
2393  mos7840_port->ControlRegOffset, &Data);
2394  if (status < 0) {
2395  dev_dbg(&port->dev, "Reading ControlReg failed status-0x%x\n", status);
2396  goto out;
2397  } else
2398  dev_dbg(&port->dev, "ControlReg Reading success val is %x, status%d\n", Data, status);
2399  Data |= 0x08; /* setting driver done bit */
2400  Data |= 0x04; /* sp1_bit to have cts change reflect in
2401  modem status reg */
2402 
2403  /* Data |= 0x20; //rx_disable bit */
2404  status = mos7840_set_reg_sync(port,
2405  mos7840_port->ControlRegOffset, Data);
2406  if (status < 0) {
2407  dev_dbg(&port->dev, "Writing ControlReg failed(rx_disable) status-0x%x\n", status);
2408  goto out;
2409  } else
2410  dev_dbg(&port->dev, "ControlReg Writing success(rx_disable) status%d\n", status);
2411 
2412  /* Write default values in DCR (i.e 0x01 in DCR0, 0x05 in DCR2
2413  and 0x24 in DCR3 */
2414  Data = 0x01;
2415  status = mos7840_set_reg_sync(port,
2416  (__u16) (mos7840_port->DcrRegOffset + 0), Data);
2417  if (status < 0) {
2418  dev_dbg(&port->dev, "Writing DCR0 failed status-0x%x\n", status);
2419  goto out;
2420  } else
2421  dev_dbg(&port->dev, "DCR0 Writing success status%d\n", status);
2422 
2423  Data = 0x05;
2424  status = mos7840_set_reg_sync(port,
2425  (__u16) (mos7840_port->DcrRegOffset + 1), Data);
2426  if (status < 0) {
2427  dev_dbg(&port->dev, "Writing DCR1 failed status-0x%x\n", status);
2428  goto out;
2429  } else
2430  dev_dbg(&port->dev, "DCR1 Writing success status%d\n", status);
2431 
2432  Data = 0x24;
2433  status = mos7840_set_reg_sync(port,
2434  (__u16) (mos7840_port->DcrRegOffset + 2), Data);
2435  if (status < 0) {
2436  dev_dbg(&port->dev, "Writing DCR2 failed status-0x%x\n", status);
2437  goto out;
2438  } else
2439  dev_dbg(&port->dev, "DCR2 Writing success status%d\n", status);
2440 
2441  /* write values in clkstart0x0 and clkmulti 0x20 */
2442  Data = 0x0;
2443  status = mos7840_set_reg_sync(port, CLK_START_VALUE_REGISTER, Data);
2444  if (status < 0) {
2445  dev_dbg(&port->dev, "Writing CLK_START_VALUE_REGISTER failed status-0x%x\n", status);
2446  goto out;
2447  } else
2448  dev_dbg(&port->dev, "CLK_START_VALUE_REGISTER Writing success status%d\n", status);
2449 
2450  Data = 0x20;
2451  status = mos7840_set_reg_sync(port, CLK_MULTI_REGISTER, Data);
2452  if (status < 0) {
2453  dev_dbg(&port->dev, "Writing CLK_MULTI_REGISTER failed status-0x%x\n", status);
2454  goto error;
2455  } else
2456  dev_dbg(&port->dev, "CLK_MULTI_REGISTER Writing success status%d\n", status);
2457 
2458  /* write value 0x0 to scratchpad register */
2459  Data = 0x00;
2460  status = mos7840_set_uart_reg(port, SCRATCH_PAD_REGISTER, Data);
2461  if (status < 0) {
2462  dev_dbg(&port->dev, "Writing SCRATCH_PAD_REGISTER failed status-0x%x\n", status);
2463  goto out;
2464  } else
2465  dev_dbg(&port->dev, "SCRATCH_PAD_REGISTER Writing success status%d\n", status);
2466 
2467  /* Zero Length flag register */
2468  if ((mos7840_port->port_num != 1) && (serial->num_ports == 2)) {
2469  Data = 0xff;
2470  status = mos7840_set_reg_sync(port,
2471  (__u16) (ZLP_REG1 +
2472  ((__u16)mos7840_port->port_num)), Data);
2473  dev_dbg(&port->dev, "ZLIP offset %x\n",
2474  (__u16)(ZLP_REG1 + ((__u16) mos7840_port->port_num)));
2475  if (status < 0) {
2476  dev_dbg(&port->dev, "Writing ZLP_REG%d failed status-0x%x\n", pnum + 2, status);
2477  goto out;
2478  } else
2479  dev_dbg(&port->dev, "ZLP_REG%d Writing success status%d\n", pnum + 2, status);
2480  } else {
2481  Data = 0xff;
2482  status = mos7840_set_reg_sync(port,
2483  (__u16) (ZLP_REG1 +
2484  ((__u16)mos7840_port->port_num) - 0x1), Data);
2485  dev_dbg(&port->dev, "ZLIP offset %x\n",
2486  (__u16)(ZLP_REG1 + ((__u16) mos7840_port->port_num) - 0x1));
2487  if (status < 0) {
2488  dev_dbg(&port->dev, "Writing ZLP_REG%d failed status-0x%x\n", pnum + 1, status);
2489  goto out;
2490  } else
2491  dev_dbg(&port->dev, "ZLP_REG%d Writing success status%d\n", pnum + 1, status);
2492 
2493  }
2494  mos7840_port->control_urb = usb_alloc_urb(0, GFP_KERNEL);
2495  mos7840_port->ctrl_buf = kmalloc(16, GFP_KERNEL);
2496  mos7840_port->dr = kmalloc(sizeof(struct usb_ctrlrequest),
2497  GFP_KERNEL);
2498  if (!mos7840_port->control_urb || !mos7840_port->ctrl_buf ||
2499  !mos7840_port->dr) {
2500  status = -ENOMEM;
2501  goto error;
2502  }
2503 
2504  mos7840_port->has_led = false;
2505 
2506  /* Initialize LED timers */
2507  if (device_type == MOSCHIP_DEVICE_ID_7810) {
2508  mos7840_port->has_led = true;
2509 
2510  init_timer(&mos7840_port->led_timer1);
2511  mos7840_port->led_timer1.function = mos7840_led_off;
2512  mos7840_port->led_timer1.expires =
2513  jiffies + msecs_to_jiffies(LED_ON_MS);
2514  mos7840_port->led_timer1.data = (unsigned long)mos7840_port;
2515 
2516  init_timer(&mos7840_port->led_timer2);
2517  mos7840_port->led_timer2.function = mos7840_led_flag_off;
2518  mos7840_port->led_timer2.expires =
2519  jiffies + msecs_to_jiffies(LED_OFF_MS);
2520  mos7840_port->led_timer2.data = (unsigned long)mos7840_port;
2521 
2522  mos7840_port->led_flag = false;
2523 
2524  /* Turn off LED */
2525  mos7840_set_led_sync(port, MODEM_CONTROL_REGISTER, 0x0300);
2526  }
2527 out:
2528  if (pnum == serial->num_ports - 1) {
2529  /* Zero Length flag enable */
2530  Data = 0x0f;
2531  status = mos7840_set_reg_sync(serial->port[0], ZLP_REG5, Data);
2532  if (status < 0) {
2533  dev_dbg(&port->dev, "Writing ZLP_REG5 failed status-0x%x\n", status);
2534  goto error;
2535  } else
2536  dev_dbg(&port->dev, "ZLP_REG5 Writing success status%d\n", status);
2537 
2538  /* setting configuration feature to one */
2539  usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0),
2540  0x03, 0x00, 0x01, 0x00, NULL, 0x00,
2541  MOS_WDR_TIMEOUT);
2542  }
2543  return 0;
2544 error:
2545  kfree(mos7840_port->dr);
2546  kfree(mos7840_port->ctrl_buf);
2547  usb_free_urb(mos7840_port->control_urb);
2548  kfree(mos7840_port);
2549 
2550  return status;
2551 }
2552 
2553 static int mos7840_port_remove(struct usb_serial_port *port)
2554 {
2555  struct moschip_port *mos7840_port;
2556 
2557  mos7840_port = mos7840_get_port_private(port);
2558 
2559  if (mos7840_port->has_led) {
2560  /* Turn off LED */
2561  mos7840_set_led_sync(port, MODEM_CONTROL_REGISTER, 0x0300);
2562 
2563  del_timer_sync(&mos7840_port->led_timer1);
2564  del_timer_sync(&mos7840_port->led_timer2);
2565  }
2566  usb_kill_urb(mos7840_port->control_urb);
2567  usb_free_urb(mos7840_port->control_urb);
2568  kfree(mos7840_port->ctrl_buf);
2569  kfree(mos7840_port->dr);
2570  kfree(mos7840_port);
2571 
2572  return 0;
2573 }
2574 
2575 static struct usb_serial_driver moschip7840_4port_device = {
2576  .driver = {
2577  .owner = THIS_MODULE,
2578  .name = "mos7840",
2579  },
2580  .description = DRIVER_DESC,
2581  .id_table = id_table,
2582  .num_ports = 4,
2583  .open = mos7840_open,
2584  .close = mos7840_close,
2585  .write = mos7840_write,
2586  .write_room = mos7840_write_room,
2587  .chars_in_buffer = mos7840_chars_in_buffer,
2588  .throttle = mos7840_throttle,
2589  .unthrottle = mos7840_unthrottle,
2590  .calc_num_ports = mos7840_calc_num_ports,
2591 #ifdef MCSSerialProbe
2592  .probe = mos7840_serial_probe,
2593 #endif
2594  .ioctl = mos7840_ioctl,
2595  .set_termios = mos7840_set_termios,
2596  .break_ctl = mos7840_break,
2597  .tiocmget = mos7840_tiocmget,
2598  .tiocmset = mos7840_tiocmset,
2599  .get_icount = mos7840_get_icount,
2600  .port_probe = mos7840_port_probe,
2601  .port_remove = mos7840_port_remove,
2602  .read_bulk_callback = mos7840_bulk_in_callback,
2603  .read_int_callback = mos7840_interrupt_callback,
2604 };
2605 
2606 static struct usb_serial_driver * const serial_drivers[] = {
2607  &moschip7840_4port_device, NULL
2608 };
2609 
2610 module_usb_serial_driver(serial_drivers, id_table);
2611 
2612 MODULE_DESCRIPTION(DRIVER_DESC);
2613 MODULE_LICENSE("GPL");
Generated on Thu Jan 10 2013 14:38:24 for Linux Kernel by   doxygen 1.8.2