xref: /openbmc/linux/drivers/usb/serial/mos7840.c (revision 4f205687)
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/slab.h>
28 #include <linux/tty.h>
29 #include <linux/tty_driver.h>
30 #include <linux/tty_flip.h>
31 #include <linux/module.h>
32 #include <linux/serial.h>
33 #include <linux/usb.h>
34 #include <linux/usb/serial.h>
35 #include <linux/uaccess.h>
36 
37 #define DRIVER_DESC "Moschip 7840/7820 USB Serial Driver"
38 
39 /*
40  * 16C50 UART register defines
41  */
42 
43 #define LCR_BITS_5             0x00	/* 5 bits/char */
44 #define LCR_BITS_6             0x01	/* 6 bits/char */
45 #define LCR_BITS_7             0x02	/* 7 bits/char */
46 #define LCR_BITS_8             0x03	/* 8 bits/char */
47 #define LCR_BITS_MASK          0x03	/* Mask for bits/char field */
48 
49 #define LCR_STOP_1             0x00	/* 1 stop bit */
50 #define LCR_STOP_1_5           0x04	/* 1.5 stop bits (if 5   bits/char) */
51 #define LCR_STOP_2             0x04	/* 2 stop bits   (if 6-8 bits/char) */
52 #define LCR_STOP_MASK          0x04	/* Mask for stop bits field */
53 
54 #define LCR_PAR_NONE           0x00	/* No parity */
55 #define LCR_PAR_ODD            0x08	/* Odd parity */
56 #define LCR_PAR_EVEN           0x18	/* Even parity */
57 #define LCR_PAR_MARK           0x28	/* Force parity bit to 1 */
58 #define LCR_PAR_SPACE          0x38	/* Force parity bit to 0 */
59 #define LCR_PAR_MASK           0x38	/* Mask for parity field */
60 
61 #define LCR_SET_BREAK          0x40	/* Set Break condition */
62 #define LCR_DL_ENABLE          0x80	/* Enable access to divisor latch */
63 
64 #define MCR_DTR                0x01	/* Assert DTR */
65 #define MCR_RTS                0x02	/* Assert RTS */
66 #define MCR_OUT1               0x04	/* Loopback only: Sets state of RI */
67 #define MCR_MASTER_IE          0x08	/* Enable interrupt outputs */
68 #define MCR_LOOPBACK           0x10	/* Set internal (digital) loopback mode */
69 #define MCR_XON_ANY            0x20	/* Enable any char to exit XOFF mode */
70 
71 #define MOS7840_MSR_CTS        0x10	/* Current state of CTS */
72 #define MOS7840_MSR_DSR        0x20	/* Current state of DSR */
73 #define MOS7840_MSR_RI         0x40	/* Current state of RI */
74 #define MOS7840_MSR_CD         0x80	/* Current state of CD */
75 
76 /*
77  * Defines used for sending commands to port
78  */
79 
80 #define MOS_WDR_TIMEOUT		5000	/* default urb timeout */
81 
82 #define MOS_PORT1       0x0200
83 #define MOS_PORT2       0x0300
84 #define MOS_VENREG      0x0000
85 #define MOS_MAX_PORT	0x02
86 #define MOS_WRITE       0x0E
87 #define MOS_READ        0x0D
88 
89 /* Requests */
90 #define MCS_RD_RTYPE    0xC0
91 #define MCS_WR_RTYPE    0x40
92 #define MCS_RDREQ       0x0D
93 #define MCS_WRREQ       0x0E
94 #define MCS_CTRL_TIMEOUT        500
95 #define VENDOR_READ_LENGTH      (0x01)
96 
97 #define MAX_NAME_LEN    64
98 
99 #define ZLP_REG1  0x3A		/* Zero_Flag_Reg1    58 */
100 #define ZLP_REG5  0x3E		/* Zero_Flag_Reg5    62 */
101 
102 /* For higher baud Rates use TIOCEXBAUD */
103 #define TIOCEXBAUD     0x5462
104 
105 /* vendor id and device id defines */
106 
107 /* The native mos7840/7820 component */
108 #define USB_VENDOR_ID_MOSCHIP           0x9710
109 #define MOSCHIP_DEVICE_ID_7840          0x7840
110 #define MOSCHIP_DEVICE_ID_7820          0x7820
111 #define MOSCHIP_DEVICE_ID_7810          0x7810
112 /* The native component can have its vendor/device id's overridden
113  * in vendor-specific implementations.  Such devices can be handled
114  * by making a change here, in id_table.
115  */
116 #define USB_VENDOR_ID_BANDB              0x0856
117 #define BANDB_DEVICE_ID_USO9ML2_2        0xAC22
118 #define BANDB_DEVICE_ID_USO9ML2_2P       0xBC00
119 #define BANDB_DEVICE_ID_USO9ML2_4        0xAC24
120 #define BANDB_DEVICE_ID_USO9ML2_4P       0xBC01
121 #define BANDB_DEVICE_ID_US9ML2_2         0xAC29
122 #define BANDB_DEVICE_ID_US9ML2_4         0xAC30
123 #define BANDB_DEVICE_ID_USPTL4_2         0xAC31
124 #define BANDB_DEVICE_ID_USPTL4_4         0xAC32
125 #define BANDB_DEVICE_ID_USOPTL4_2        0xAC42
126 #define BANDB_DEVICE_ID_USOPTL4_2P       0xBC02
127 #define BANDB_DEVICE_ID_USOPTL4_4        0xAC44
128 #define BANDB_DEVICE_ID_USOPTL4_4P       0xBC03
129 #define BANDB_DEVICE_ID_USOPTL2_4        0xAC24
130 
131 /* This driver also supports
132  * ATEN UC2324 device using Moschip MCS7840
133  * ATEN UC2322 device using Moschip MCS7820
134  */
135 #define USB_VENDOR_ID_ATENINTL		0x0557
136 #define ATENINTL_DEVICE_ID_UC2324	0x2011
137 #define ATENINTL_DEVICE_ID_UC2322	0x7820
138 
139 /* Interrupt Routine Defines    */
140 
141 #define SERIAL_IIR_RLS      0x06
142 #define SERIAL_IIR_MS       0x00
143 
144 /*
145  *  Emulation of the bit mask on the LINE STATUS REGISTER.
146  */
147 #define SERIAL_LSR_DR       0x0001
148 #define SERIAL_LSR_OE       0x0002
149 #define SERIAL_LSR_PE       0x0004
150 #define SERIAL_LSR_FE       0x0008
151 #define SERIAL_LSR_BI       0x0010
152 
153 #define MOS_MSR_DELTA_CTS   0x10
154 #define MOS_MSR_DELTA_DSR   0x20
155 #define MOS_MSR_DELTA_RI    0x40
156 #define MOS_MSR_DELTA_CD    0x80
157 
158 /* Serial Port register Address */
159 #define INTERRUPT_ENABLE_REGISTER  ((__u16)(0x01))
160 #define FIFO_CONTROL_REGISTER      ((__u16)(0x02))
161 #define LINE_CONTROL_REGISTER      ((__u16)(0x03))
162 #define MODEM_CONTROL_REGISTER     ((__u16)(0x04))
163 #define LINE_STATUS_REGISTER       ((__u16)(0x05))
164 #define MODEM_STATUS_REGISTER      ((__u16)(0x06))
165 #define SCRATCH_PAD_REGISTER       ((__u16)(0x07))
166 #define DIVISOR_LATCH_LSB          ((__u16)(0x00))
167 #define DIVISOR_LATCH_MSB          ((__u16)(0x01))
168 
169 #define CLK_MULTI_REGISTER         ((__u16)(0x02))
170 #define CLK_START_VALUE_REGISTER   ((__u16)(0x03))
171 #define GPIO_REGISTER              ((__u16)(0x07))
172 
173 #define SERIAL_LCR_DLAB            ((__u16)(0x0080))
174 
175 /*
176  * URB POOL related defines
177  */
178 #define NUM_URBS                        16	/* URB Count */
179 #define URB_TRANSFER_BUFFER_SIZE        32	/* URB Size  */
180 
181 /* LED on/off milliseconds*/
182 #define LED_ON_MS	500
183 #define LED_OFF_MS	500
184 
185 enum mos7840_flag {
186 	MOS7840_FLAG_CTRL_BUSY,
187 	MOS7840_FLAG_LED_BUSY,
188 };
189 
190 static const struct usb_device_id id_table[] = {
191 	{USB_DEVICE(USB_VENDOR_ID_MOSCHIP, MOSCHIP_DEVICE_ID_7840)},
192 	{USB_DEVICE(USB_VENDOR_ID_MOSCHIP, MOSCHIP_DEVICE_ID_7820)},
193 	{USB_DEVICE(USB_VENDOR_ID_MOSCHIP, MOSCHIP_DEVICE_ID_7810)},
194 	{USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USO9ML2_2)},
195 	{USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USO9ML2_2P)},
196 	{USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USO9ML2_4)},
197 	{USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USO9ML2_4P)},
198 	{USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_US9ML2_2)},
199 	{USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_US9ML2_4)},
200 	{USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USPTL4_2)},
201 	{USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USPTL4_4)},
202 	{USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USOPTL4_2)},
203 	{USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USOPTL4_2P)},
204 	{USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USOPTL4_4)},
205 	{USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USOPTL4_4P)},
206 	{USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USOPTL2_4)},
207 	{USB_DEVICE(USB_VENDOR_ID_ATENINTL, ATENINTL_DEVICE_ID_UC2324)},
208 	{USB_DEVICE(USB_VENDOR_ID_ATENINTL, ATENINTL_DEVICE_ID_UC2322)},
209 	{}			/* terminating entry */
210 };
211 MODULE_DEVICE_TABLE(usb, id_table);
212 
213 /* This structure holds all of the local port information */
214 
215 struct moschip_port {
216 	int port_num;		/*Actual port number in the device(1,2,etc) */
217 	struct urb *write_urb;	/* write URB for this port */
218 	struct urb *read_urb;	/* read URB for this port */
219 	__u8 shadowLCR;		/* last LCR value received */
220 	__u8 shadowMCR;		/* last MCR value received */
221 	char open;
222 	char open_ports;
223 	struct usb_serial_port *port;	/* loop back to the owner of this object */
224 
225 	/* Offsets */
226 	__u8 SpRegOffset;
227 	__u8 ControlRegOffset;
228 	__u8 DcrRegOffset;
229 	/* for processing control URBS in interrupt context */
230 	struct urb *control_urb;
231 	struct usb_ctrlrequest *dr;
232 	char *ctrl_buf;
233 	int MsrLsr;
234 
235 	spinlock_t pool_lock;
236 	struct urb *write_urb_pool[NUM_URBS];
237 	char busy[NUM_URBS];
238 	bool read_urb_busy;
239 
240 	/* For device(s) with LED indicator */
241 	bool has_led;
242 	struct timer_list led_timer1;	/* Timer for LED on */
243 	struct timer_list led_timer2;	/* Timer for LED off */
244 	struct urb *led_urb;
245 	struct usb_ctrlrequest *led_dr;
246 
247 	unsigned long flags;
248 };
249 
250 /*
251  * mos7840_set_reg_sync
252  * 	To set the Control register by calling usb_fill_control_urb function
253  *	by passing usb_sndctrlpipe function as parameter.
254  */
255 
256 static int mos7840_set_reg_sync(struct usb_serial_port *port, __u16 reg,
257 				__u16 val)
258 {
259 	struct usb_device *dev = port->serial->dev;
260 	val = val & 0x00ff;
261 	dev_dbg(&port->dev, "mos7840_set_reg_sync offset is %x, value %x\n", reg, val);
262 
263 	return usb_control_msg(dev, usb_sndctrlpipe(dev, 0), MCS_WRREQ,
264 			       MCS_WR_RTYPE, val, reg, NULL, 0,
265 			       MOS_WDR_TIMEOUT);
266 }
267 
268 /*
269  * mos7840_get_reg_sync
270  * 	To set the Uart register by calling usb_fill_control_urb function by
271  *	passing usb_rcvctrlpipe function as parameter.
272  */
273 
274 static int mos7840_get_reg_sync(struct usb_serial_port *port, __u16 reg,
275 				__u16 *val)
276 {
277 	struct usb_device *dev = port->serial->dev;
278 	int ret = 0;
279 	u8 *buf;
280 
281 	buf = kmalloc(VENDOR_READ_LENGTH, GFP_KERNEL);
282 	if (!buf)
283 		return -ENOMEM;
284 
285 	ret = usb_control_msg(dev, usb_rcvctrlpipe(dev, 0), MCS_RDREQ,
286 			      MCS_RD_RTYPE, 0, reg, buf, VENDOR_READ_LENGTH,
287 			      MOS_WDR_TIMEOUT);
288 	*val = buf[0];
289 	dev_dbg(&port->dev, "%s offset is %x, return val %x\n", __func__, reg, *val);
290 
291 	kfree(buf);
292 	return ret;
293 }
294 
295 /*
296  * mos7840_set_uart_reg
297  *	To set the Uart register by calling usb_fill_control_urb function by
298  *	passing usb_sndctrlpipe function as parameter.
299  */
300 
301 static int mos7840_set_uart_reg(struct usb_serial_port *port, __u16 reg,
302 				__u16 val)
303 {
304 
305 	struct usb_device *dev = port->serial->dev;
306 	val = val & 0x00ff;
307 	/* For the UART control registers, the application number need
308 	   to be Or'ed */
309 	if (port->serial->num_ports == 4) {
310 		val |= ((__u16)port->port_number + 1) << 8;
311 	} else {
312 		if (port->port_number == 0) {
313 			val |= ((__u16)port->port_number + 1) << 8;
314 		} else {
315 			val |= ((__u16)port->port_number + 2) << 8;
316 		}
317 	}
318 	dev_dbg(&port->dev, "%s application number is %x\n", __func__, val);
319 	return usb_control_msg(dev, usb_sndctrlpipe(dev, 0), MCS_WRREQ,
320 			       MCS_WR_RTYPE, val, reg, NULL, 0,
321 			       MOS_WDR_TIMEOUT);
322 
323 }
324 
325 /*
326  * mos7840_get_uart_reg
327  *	To set the Control register by calling usb_fill_control_urb function
328  *	by passing usb_rcvctrlpipe function as parameter.
329  */
330 static int mos7840_get_uart_reg(struct usb_serial_port *port, __u16 reg,
331 				__u16 *val)
332 {
333 	struct usb_device *dev = port->serial->dev;
334 	int ret = 0;
335 	__u16 Wval;
336 	u8 *buf;
337 
338 	buf = kmalloc(VENDOR_READ_LENGTH, GFP_KERNEL);
339 	if (!buf)
340 		return -ENOMEM;
341 
342 	/* Wval  is same as application number */
343 	if (port->serial->num_ports == 4) {
344 		Wval = ((__u16)port->port_number + 1) << 8;
345 	} else {
346 		if (port->port_number == 0) {
347 			Wval = ((__u16)port->port_number + 1) << 8;
348 		} else {
349 			Wval = ((__u16)port->port_number + 2) << 8;
350 		}
351 	}
352 	dev_dbg(&port->dev, "%s application number is %x\n", __func__, Wval);
353 	ret = usb_control_msg(dev, usb_rcvctrlpipe(dev, 0), MCS_RDREQ,
354 			      MCS_RD_RTYPE, Wval, reg, buf, VENDOR_READ_LENGTH,
355 			      MOS_WDR_TIMEOUT);
356 	*val = buf[0];
357 
358 	kfree(buf);
359 	return ret;
360 }
361 
362 static void mos7840_dump_serial_port(struct usb_serial_port *port,
363 				     struct moschip_port *mos7840_port)
364 {
365 
366 	dev_dbg(&port->dev, "SpRegOffset is %2x\n", mos7840_port->SpRegOffset);
367 	dev_dbg(&port->dev, "ControlRegOffset is %2x\n", mos7840_port->ControlRegOffset);
368 	dev_dbg(&port->dev, "DCRRegOffset is %2x\n", mos7840_port->DcrRegOffset);
369 
370 }
371 
372 /************************************************************************/
373 /************************************************************************/
374 /*             I N T E R F A C E   F U N C T I O N S			*/
375 /*             I N T E R F A C E   F U N C T I O N S			*/
376 /************************************************************************/
377 /************************************************************************/
378 
379 static inline void mos7840_set_port_private(struct usb_serial_port *port,
380 					    struct moschip_port *data)
381 {
382 	usb_set_serial_port_data(port, (void *)data);
383 }
384 
385 static inline struct moschip_port *mos7840_get_port_private(struct
386 							    usb_serial_port
387 							    *port)
388 {
389 	return (struct moschip_port *)usb_get_serial_port_data(port);
390 }
391 
392 static void mos7840_handle_new_msr(struct moschip_port *port, __u8 new_msr)
393 {
394 	struct moschip_port *mos7840_port;
395 	struct async_icount *icount;
396 	mos7840_port = port;
397 	if (new_msr &
398 	    (MOS_MSR_DELTA_CTS | MOS_MSR_DELTA_DSR | MOS_MSR_DELTA_RI |
399 	     MOS_MSR_DELTA_CD)) {
400 		icount = &mos7840_port->port->icount;
401 
402 		/* update input line counters */
403 		if (new_msr & MOS_MSR_DELTA_CTS)
404 			icount->cts++;
405 		if (new_msr & MOS_MSR_DELTA_DSR)
406 			icount->dsr++;
407 		if (new_msr & MOS_MSR_DELTA_CD)
408 			icount->dcd++;
409 		if (new_msr & MOS_MSR_DELTA_RI)
410 			icount->rng++;
411 
412 		wake_up_interruptible(&port->port->port.delta_msr_wait);
413 	}
414 }
415 
416 static void mos7840_handle_new_lsr(struct moschip_port *port, __u8 new_lsr)
417 {
418 	struct async_icount *icount;
419 
420 	if (new_lsr & SERIAL_LSR_BI) {
421 		/*
422 		 * Parity and Framing errors only count if they
423 		 * occur exclusive of a break being
424 		 * received.
425 		 */
426 		new_lsr &= (__u8) (SERIAL_LSR_OE | SERIAL_LSR_BI);
427 	}
428 
429 	/* update input line counters */
430 	icount = &port->port->icount;
431 	if (new_lsr & SERIAL_LSR_BI)
432 		icount->brk++;
433 	if (new_lsr & SERIAL_LSR_OE)
434 		icount->overrun++;
435 	if (new_lsr & SERIAL_LSR_PE)
436 		icount->parity++;
437 	if (new_lsr & SERIAL_LSR_FE)
438 		icount->frame++;
439 }
440 
441 /************************************************************************/
442 /************************************************************************/
443 /*            U S B  C A L L B A C K   F U N C T I O N S                */
444 /*            U S B  C A L L B A C K   F U N C T I O N S                */
445 /************************************************************************/
446 /************************************************************************/
447 
448 static void mos7840_control_callback(struct urb *urb)
449 {
450 	unsigned char *data;
451 	struct moschip_port *mos7840_port;
452 	struct device *dev = &urb->dev->dev;
453 	__u8 regval = 0x0;
454 	int status = urb->status;
455 
456 	mos7840_port = urb->context;
457 
458 	switch (status) {
459 	case 0:
460 		/* success */
461 		break;
462 	case -ECONNRESET:
463 	case -ENOENT:
464 	case -ESHUTDOWN:
465 		/* this urb is terminated, clean up */
466 		dev_dbg(dev, "%s - urb shutting down with status: %d\n", __func__, status);
467 		goto out;
468 	default:
469 		dev_dbg(dev, "%s - nonzero urb status received: %d\n", __func__, status);
470 		goto out;
471 	}
472 
473 	dev_dbg(dev, "%s urb buffer size is %d\n", __func__, urb->actual_length);
474 	dev_dbg(dev, "%s mos7840_port->MsrLsr is %d port %d\n", __func__,
475 		mos7840_port->MsrLsr, mos7840_port->port_num);
476 	data = urb->transfer_buffer;
477 	regval = (__u8) data[0];
478 	dev_dbg(dev, "%s data is %x\n", __func__, regval);
479 	if (mos7840_port->MsrLsr == 0)
480 		mos7840_handle_new_msr(mos7840_port, regval);
481 	else if (mos7840_port->MsrLsr == 1)
482 		mos7840_handle_new_lsr(mos7840_port, regval);
483 out:
484 	clear_bit_unlock(MOS7840_FLAG_CTRL_BUSY, &mos7840_port->flags);
485 }
486 
487 static int mos7840_get_reg(struct moschip_port *mcs, __u16 Wval, __u16 reg,
488 			   __u16 *val)
489 {
490 	struct usb_device *dev = mcs->port->serial->dev;
491 	struct usb_ctrlrequest *dr = mcs->dr;
492 	unsigned char *buffer = mcs->ctrl_buf;
493 	int ret;
494 
495 	if (test_and_set_bit_lock(MOS7840_FLAG_CTRL_BUSY, &mcs->flags))
496 		return -EBUSY;
497 
498 	dr->bRequestType = MCS_RD_RTYPE;
499 	dr->bRequest = MCS_RDREQ;
500 	dr->wValue = cpu_to_le16(Wval);	/* 0 */
501 	dr->wIndex = cpu_to_le16(reg);
502 	dr->wLength = cpu_to_le16(2);
503 
504 	usb_fill_control_urb(mcs->control_urb, dev, usb_rcvctrlpipe(dev, 0),
505 			     (unsigned char *)dr, buffer, 2,
506 			     mos7840_control_callback, mcs);
507 	mcs->control_urb->transfer_buffer_length = 2;
508 	ret = usb_submit_urb(mcs->control_urb, GFP_ATOMIC);
509 	if (ret)
510 		clear_bit_unlock(MOS7840_FLAG_CTRL_BUSY, &mcs->flags);
511 
512 	return ret;
513 }
514 
515 static void mos7840_set_led_callback(struct urb *urb)
516 {
517 	switch (urb->status) {
518 	case 0:
519 		/* Success */
520 		break;
521 	case -ECONNRESET:
522 	case -ENOENT:
523 	case -ESHUTDOWN:
524 		/* This urb is terminated, clean up */
525 		dev_dbg(&urb->dev->dev, "%s - urb shutting down: %d\n",
526 			__func__, urb->status);
527 		break;
528 	default:
529 		dev_dbg(&urb->dev->dev, "%s - nonzero urb status: %d\n",
530 			__func__, urb->status);
531 	}
532 }
533 
534 static void mos7840_set_led_async(struct moschip_port *mcs, __u16 wval,
535 				__u16 reg)
536 {
537 	struct usb_device *dev = mcs->port->serial->dev;
538 	struct usb_ctrlrequest *dr = mcs->led_dr;
539 
540 	dr->bRequestType = MCS_WR_RTYPE;
541 	dr->bRequest = MCS_WRREQ;
542 	dr->wValue = cpu_to_le16(wval);
543 	dr->wIndex = cpu_to_le16(reg);
544 	dr->wLength = cpu_to_le16(0);
545 
546 	usb_fill_control_urb(mcs->led_urb, dev, usb_sndctrlpipe(dev, 0),
547 		(unsigned char *)dr, NULL, 0, mos7840_set_led_callback, NULL);
548 
549 	usb_submit_urb(mcs->led_urb, GFP_ATOMIC);
550 }
551 
552 static void mos7840_set_led_sync(struct usb_serial_port *port, __u16 reg,
553 				__u16 val)
554 {
555 	struct usb_device *dev = port->serial->dev;
556 
557 	usb_control_msg(dev, usb_sndctrlpipe(dev, 0), MCS_WRREQ, MCS_WR_RTYPE,
558 			val, reg, NULL, 0, MOS_WDR_TIMEOUT);
559 }
560 
561 static void mos7840_led_off(unsigned long arg)
562 {
563 	struct moschip_port *mcs = (struct moschip_port *) arg;
564 
565 	/* Turn off LED */
566 	mos7840_set_led_async(mcs, 0x0300, MODEM_CONTROL_REGISTER);
567 	mod_timer(&mcs->led_timer2,
568 				jiffies + msecs_to_jiffies(LED_OFF_MS));
569 }
570 
571 static void mos7840_led_flag_off(unsigned long arg)
572 {
573 	struct moschip_port *mcs = (struct moschip_port *) arg;
574 
575 	clear_bit_unlock(MOS7840_FLAG_LED_BUSY, &mcs->flags);
576 }
577 
578 static void mos7840_led_activity(struct usb_serial_port *port)
579 {
580 	struct moschip_port *mos7840_port = usb_get_serial_port_data(port);
581 
582 	if (test_and_set_bit_lock(MOS7840_FLAG_LED_BUSY, &mos7840_port->flags))
583 		return;
584 
585 	mos7840_set_led_async(mos7840_port, 0x0301, MODEM_CONTROL_REGISTER);
586 	mod_timer(&mos7840_port->led_timer1,
587 				jiffies + msecs_to_jiffies(LED_ON_MS));
588 }
589 
590 /*****************************************************************************
591  * mos7840_interrupt_callback
592  *	this is the callback function for when we have received data on the
593  *	interrupt endpoint.
594  *****************************************************************************/
595 
596 static void mos7840_interrupt_callback(struct urb *urb)
597 {
598 	int result;
599 	int length;
600 	struct moschip_port *mos7840_port;
601 	struct usb_serial *serial;
602 	__u16 Data;
603 	unsigned char *data;
604 	__u8 sp[5], st;
605 	int i, rv = 0;
606 	__u16 wval, wreg = 0;
607 	int status = urb->status;
608 
609 	switch (status) {
610 	case 0:
611 		/* success */
612 		break;
613 	case -ECONNRESET:
614 	case -ENOENT:
615 	case -ESHUTDOWN:
616 		/* this urb is terminated, clean up */
617 		dev_dbg(&urb->dev->dev, "%s - urb shutting down with status: %d\n",
618 			__func__, status);
619 		return;
620 	default:
621 		dev_dbg(&urb->dev->dev, "%s - nonzero urb status received: %d\n",
622 			__func__, status);
623 		goto exit;
624 	}
625 
626 	length = urb->actual_length;
627 	data = urb->transfer_buffer;
628 
629 	serial = urb->context;
630 
631 	/* Moschip get 5 bytes
632 	 * Byte 1 IIR Port 1 (port.number is 0)
633 	 * Byte 2 IIR Port 2 (port.number is 1)
634 	 * Byte 3 IIR Port 3 (port.number is 2)
635 	 * Byte 4 IIR Port 4 (port.number is 3)
636 	 * Byte 5 FIFO status for both */
637 
638 	if (length > 5) {
639 		dev_dbg(&urb->dev->dev, "%s", "Wrong data !!!\n");
640 		return;
641 	}
642 
643 	sp[0] = (__u8) data[0];
644 	sp[1] = (__u8) data[1];
645 	sp[2] = (__u8) data[2];
646 	sp[3] = (__u8) data[3];
647 	st = (__u8) data[4];
648 
649 	for (i = 0; i < serial->num_ports; i++) {
650 		mos7840_port = mos7840_get_port_private(serial->port[i]);
651 		wval = ((__u16)serial->port[i]->port_number + 1) << 8;
652 		if (mos7840_port->open) {
653 			if (sp[i] & 0x01) {
654 				dev_dbg(&urb->dev->dev, "SP%d No Interrupt !!!\n", i);
655 			} else {
656 				switch (sp[i] & 0x0f) {
657 				case SERIAL_IIR_RLS:
658 					dev_dbg(&urb->dev->dev, "Serial Port %d: Receiver status error or \n", i);
659 					dev_dbg(&urb->dev->dev, "address bit detected in 9-bit mode\n");
660 					mos7840_port->MsrLsr = 1;
661 					wreg = LINE_STATUS_REGISTER;
662 					break;
663 				case SERIAL_IIR_MS:
664 					dev_dbg(&urb->dev->dev, "Serial Port %d: Modem status change\n", i);
665 					mos7840_port->MsrLsr = 0;
666 					wreg = MODEM_STATUS_REGISTER;
667 					break;
668 				}
669 				rv = mos7840_get_reg(mos7840_port, wval, wreg, &Data);
670 			}
671 		}
672 	}
673 	if (!(rv < 0))
674 		/* the completion handler for the control urb will resubmit */
675 		return;
676 exit:
677 	result = usb_submit_urb(urb, GFP_ATOMIC);
678 	if (result) {
679 		dev_err(&urb->dev->dev,
680 			"%s - Error %d submitting interrupt urb\n",
681 			__func__, result);
682 	}
683 }
684 
685 static int mos7840_port_paranoia_check(struct usb_serial_port *port,
686 				       const char *function)
687 {
688 	if (!port) {
689 		pr_debug("%s - port == NULL\n", function);
690 		return -1;
691 	}
692 	if (!port->serial) {
693 		pr_debug("%s - port->serial == NULL\n", function);
694 		return -1;
695 	}
696 
697 	return 0;
698 }
699 
700 /* Inline functions to check the sanity of a pointer that is passed to us */
701 static int mos7840_serial_paranoia_check(struct usb_serial *serial,
702 					 const char *function)
703 {
704 	if (!serial) {
705 		pr_debug("%s - serial == NULL\n", function);
706 		return -1;
707 	}
708 	if (!serial->type) {
709 		pr_debug("%s - serial->type == NULL!\n", function);
710 		return -1;
711 	}
712 
713 	return 0;
714 }
715 
716 static struct usb_serial *mos7840_get_usb_serial(struct usb_serial_port *port,
717 						 const char *function)
718 {
719 	/* if no port was specified, or it fails a paranoia check */
720 	if (!port ||
721 	    mos7840_port_paranoia_check(port, function) ||
722 	    mos7840_serial_paranoia_check(port->serial, function)) {
723 		/* then say that we don't have a valid usb_serial thing,
724 		 * which will end up genrating -ENODEV return values */
725 		return NULL;
726 	}
727 
728 	return port->serial;
729 }
730 
731 /*****************************************************************************
732  * mos7840_bulk_in_callback
733  *	this is the callback function for when we have received data on the
734  *	bulk in endpoint.
735  *****************************************************************************/
736 
737 static void mos7840_bulk_in_callback(struct urb *urb)
738 {
739 	int retval;
740 	unsigned char *data;
741 	struct usb_serial *serial;
742 	struct usb_serial_port *port;
743 	struct moschip_port *mos7840_port;
744 	int status = urb->status;
745 
746 	mos7840_port = urb->context;
747 	if (!mos7840_port)
748 		return;
749 
750 	if (status) {
751 		dev_dbg(&urb->dev->dev, "nonzero read bulk status received: %d\n", status);
752 		mos7840_port->read_urb_busy = false;
753 		return;
754 	}
755 
756 	port = mos7840_port->port;
757 	if (mos7840_port_paranoia_check(port, __func__)) {
758 		mos7840_port->read_urb_busy = false;
759 		return;
760 	}
761 
762 	serial = mos7840_get_usb_serial(port, __func__);
763 	if (!serial) {
764 		mos7840_port->read_urb_busy = false;
765 		return;
766 	}
767 
768 	data = urb->transfer_buffer;
769 	usb_serial_debug_data(&port->dev, __func__, urb->actual_length, data);
770 
771 	if (urb->actual_length) {
772 		struct tty_port *tport = &mos7840_port->port->port;
773 		tty_insert_flip_string(tport, data, urb->actual_length);
774 		tty_flip_buffer_push(tport);
775 		port->icount.rx += urb->actual_length;
776 		dev_dbg(&port->dev, "icount.rx is %d:\n", port->icount.rx);
777 	}
778 
779 	if (!mos7840_port->read_urb) {
780 		dev_dbg(&port->dev, "%s", "URB KILLED !!!\n");
781 		mos7840_port->read_urb_busy = false;
782 		return;
783 	}
784 
785 	if (mos7840_port->has_led)
786 		mos7840_led_activity(port);
787 
788 	mos7840_port->read_urb_busy = true;
789 	retval = usb_submit_urb(mos7840_port->read_urb, GFP_ATOMIC);
790 
791 	if (retval) {
792 		dev_dbg(&port->dev, "usb_submit_urb(read bulk) failed, retval = %d\n", retval);
793 		mos7840_port->read_urb_busy = false;
794 	}
795 }
796 
797 /*****************************************************************************
798  * mos7840_bulk_out_data_callback
799  *	this is the callback function for when we have finished sending
800  *	serial data on the bulk out endpoint.
801  *****************************************************************************/
802 
803 static void mos7840_bulk_out_data_callback(struct urb *urb)
804 {
805 	struct moschip_port *mos7840_port;
806 	struct usb_serial_port *port;
807 	int status = urb->status;
808 	int i;
809 
810 	mos7840_port = urb->context;
811 	port = mos7840_port->port;
812 	spin_lock(&mos7840_port->pool_lock);
813 	for (i = 0; i < NUM_URBS; i++) {
814 		if (urb == mos7840_port->write_urb_pool[i]) {
815 			mos7840_port->busy[i] = 0;
816 			break;
817 		}
818 	}
819 	spin_unlock(&mos7840_port->pool_lock);
820 
821 	if (status) {
822 		dev_dbg(&port->dev, "nonzero write bulk status received:%d\n", status);
823 		return;
824 	}
825 
826 	if (mos7840_port_paranoia_check(port, __func__))
827 		return;
828 
829 	if (mos7840_port->open)
830 		tty_port_tty_wakeup(&port->port);
831 
832 }
833 
834 /************************************************************************/
835 /*       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       */
836 /************************************************************************/
837 
838 /*****************************************************************************
839  * mos7840_open
840  *	this function is called by the tty driver when a port is opened
841  *	If successful, we return 0
842  *	Otherwise we return a negative error number.
843  *****************************************************************************/
844 
845 static int mos7840_open(struct tty_struct *tty, struct usb_serial_port *port)
846 {
847 	int response;
848 	int j;
849 	struct usb_serial *serial;
850 	struct urb *urb;
851 	__u16 Data;
852 	int status;
853 	struct moschip_port *mos7840_port;
854 	struct moschip_port *port0;
855 
856 	if (mos7840_port_paranoia_check(port, __func__))
857 		return -ENODEV;
858 
859 	serial = port->serial;
860 
861 	if (mos7840_serial_paranoia_check(serial, __func__))
862 		return -ENODEV;
863 
864 	mos7840_port = mos7840_get_port_private(port);
865 	port0 = mos7840_get_port_private(serial->port[0]);
866 
867 	if (mos7840_port == NULL || port0 == NULL)
868 		return -ENODEV;
869 
870 	usb_clear_halt(serial->dev, port->write_urb->pipe);
871 	usb_clear_halt(serial->dev, port->read_urb->pipe);
872 	port0->open_ports++;
873 
874 	/* Initialising the write urb pool */
875 	for (j = 0; j < NUM_URBS; ++j) {
876 		urb = usb_alloc_urb(0, GFP_KERNEL);
877 		mos7840_port->write_urb_pool[j] = urb;
878 		if (!urb)
879 			continue;
880 
881 		urb->transfer_buffer = kmalloc(URB_TRANSFER_BUFFER_SIZE,
882 								GFP_KERNEL);
883 		if (!urb->transfer_buffer) {
884 			usb_free_urb(urb);
885 			mos7840_port->write_urb_pool[j] = NULL;
886 			continue;
887 		}
888 	}
889 
890 /*****************************************************************************
891  * Initialize MCS7840 -- Write Init values to corresponding Registers
892  *
893  * Register Index
894  * 1 : IER
895  * 2 : FCR
896  * 3 : LCR
897  * 4 : MCR
898  *
899  * 0x08 : SP1/2 Control Reg
900  *****************************************************************************/
901 
902 	/* NEED to check the following Block */
903 
904 	Data = 0x0;
905 	status = mos7840_get_reg_sync(port, mos7840_port->SpRegOffset, &Data);
906 	if (status < 0) {
907 		dev_dbg(&port->dev, "Reading Spreg failed\n");
908 		goto err;
909 	}
910 	Data |= 0x80;
911 	status = mos7840_set_reg_sync(port, mos7840_port->SpRegOffset, Data);
912 	if (status < 0) {
913 		dev_dbg(&port->dev, "writing Spreg failed\n");
914 		goto err;
915 	}
916 
917 	Data &= ~0x80;
918 	status = mos7840_set_reg_sync(port, mos7840_port->SpRegOffset, Data);
919 	if (status < 0) {
920 		dev_dbg(&port->dev, "writing Spreg failed\n");
921 		goto err;
922 	}
923 	/* End of block to be checked */
924 
925 	Data = 0x0;
926 	status = mos7840_get_reg_sync(port, mos7840_port->ControlRegOffset,
927 									&Data);
928 	if (status < 0) {
929 		dev_dbg(&port->dev, "Reading Controlreg failed\n");
930 		goto err;
931 	}
932 	Data |= 0x08;		/* Driver done bit */
933 	Data |= 0x20;		/* rx_disable */
934 	status = mos7840_set_reg_sync(port,
935 				mos7840_port->ControlRegOffset, Data);
936 	if (status < 0) {
937 		dev_dbg(&port->dev, "writing Controlreg failed\n");
938 		goto err;
939 	}
940 	/* do register settings here */
941 	/* Set all regs to the device default values. */
942 	/***********************************
943 	 * First Disable all interrupts.
944 	 ***********************************/
945 	Data = 0x00;
946 	status = mos7840_set_uart_reg(port, INTERRUPT_ENABLE_REGISTER, Data);
947 	if (status < 0) {
948 		dev_dbg(&port->dev, "disabling interrupts failed\n");
949 		goto err;
950 	}
951 	/* Set FIFO_CONTROL_REGISTER to the default value */
952 	Data = 0x00;
953 	status = mos7840_set_uart_reg(port, FIFO_CONTROL_REGISTER, Data);
954 	if (status < 0) {
955 		dev_dbg(&port->dev, "Writing FIFO_CONTROL_REGISTER  failed\n");
956 		goto err;
957 	}
958 
959 	Data = 0xcf;
960 	status = mos7840_set_uart_reg(port, FIFO_CONTROL_REGISTER, Data);
961 	if (status < 0) {
962 		dev_dbg(&port->dev, "Writing FIFO_CONTROL_REGISTER  failed\n");
963 		goto err;
964 	}
965 
966 	Data = 0x03;
967 	status = mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data);
968 	mos7840_port->shadowLCR = Data;
969 
970 	Data = 0x0b;
971 	status = mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER, Data);
972 	mos7840_port->shadowMCR = Data;
973 
974 	Data = 0x00;
975 	status = mos7840_get_uart_reg(port, LINE_CONTROL_REGISTER, &Data);
976 	mos7840_port->shadowLCR = Data;
977 
978 	Data |= SERIAL_LCR_DLAB;	/* data latch enable in LCR 0x80 */
979 	status = mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data);
980 
981 	Data = 0x0c;
982 	status = mos7840_set_uart_reg(port, DIVISOR_LATCH_LSB, Data);
983 
984 	Data = 0x0;
985 	status = mos7840_set_uart_reg(port, DIVISOR_LATCH_MSB, Data);
986 
987 	Data = 0x00;
988 	status = mos7840_get_uart_reg(port, LINE_CONTROL_REGISTER, &Data);
989 
990 	Data = Data & ~SERIAL_LCR_DLAB;
991 	status = mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data);
992 	mos7840_port->shadowLCR = Data;
993 
994 	/* clearing Bulkin and Bulkout Fifo */
995 	Data = 0x0;
996 	status = mos7840_get_reg_sync(port, mos7840_port->SpRegOffset, &Data);
997 
998 	Data = Data | 0x0c;
999 	status = mos7840_set_reg_sync(port, mos7840_port->SpRegOffset, Data);
1000 
1001 	Data = Data & ~0x0c;
1002 	status = mos7840_set_reg_sync(port, mos7840_port->SpRegOffset, Data);
1003 	/* Finally enable all interrupts */
1004 	Data = 0x0c;
1005 	status = mos7840_set_uart_reg(port, INTERRUPT_ENABLE_REGISTER, Data);
1006 
1007 	/* clearing rx_disable */
1008 	Data = 0x0;
1009 	status = mos7840_get_reg_sync(port, mos7840_port->ControlRegOffset,
1010 									&Data);
1011 	Data = Data & ~0x20;
1012 	status = mos7840_set_reg_sync(port, mos7840_port->ControlRegOffset,
1013 									Data);
1014 
1015 	/* rx_negate */
1016 	Data = 0x0;
1017 	status = mos7840_get_reg_sync(port, mos7840_port->ControlRegOffset,
1018 									&Data);
1019 	Data = Data | 0x10;
1020 	status = mos7840_set_reg_sync(port, mos7840_port->ControlRegOffset,
1021 									Data);
1022 
1023 	/* Check to see if we've set up our endpoint info yet    *
1024 	 * (can't set it up in mos7840_startup as the structures *
1025 	 * were not set up at that time.)                        */
1026 	if (port0->open_ports == 1) {
1027 		if (serial->port[0]->interrupt_in_buffer == NULL) {
1028 			/* set up interrupt urb */
1029 			usb_fill_int_urb(serial->port[0]->interrupt_in_urb,
1030 				serial->dev,
1031 				usb_rcvintpipe(serial->dev,
1032 				serial->port[0]->interrupt_in_endpointAddress),
1033 				serial->port[0]->interrupt_in_buffer,
1034 				serial->port[0]->interrupt_in_urb->
1035 				transfer_buffer_length,
1036 				mos7840_interrupt_callback,
1037 				serial,
1038 				serial->port[0]->interrupt_in_urb->interval);
1039 
1040 			/* start interrupt read for mos7840               *
1041 			 * will continue as long as mos7840 is connected  */
1042 
1043 			response =
1044 			    usb_submit_urb(serial->port[0]->interrupt_in_urb,
1045 					   GFP_KERNEL);
1046 			if (response) {
1047 				dev_err(&port->dev, "%s - Error %d submitting "
1048 					"interrupt urb\n", __func__, response);
1049 			}
1050 
1051 		}
1052 
1053 	}
1054 
1055 	/* see if we've set up our endpoint info yet   *
1056 	 * (can't set it up in mos7840_startup as the  *
1057 	 * structures were not set up at that time.)   */
1058 
1059 	dev_dbg(&port->dev, "port number is %d\n", port->port_number);
1060 	dev_dbg(&port->dev, "minor number is %d\n", port->minor);
1061 	dev_dbg(&port->dev, "Bulkin endpoint is %d\n", port->bulk_in_endpointAddress);
1062 	dev_dbg(&port->dev, "BulkOut endpoint is %d\n", port->bulk_out_endpointAddress);
1063 	dev_dbg(&port->dev, "Interrupt endpoint is %d\n", port->interrupt_in_endpointAddress);
1064 	dev_dbg(&port->dev, "port's number in the device is %d\n", mos7840_port->port_num);
1065 	mos7840_port->read_urb = port->read_urb;
1066 
1067 	/* set up our bulk in urb */
1068 	if ((serial->num_ports == 2) && (((__u16)port->port_number % 2) != 0)) {
1069 		usb_fill_bulk_urb(mos7840_port->read_urb,
1070 			serial->dev,
1071 			usb_rcvbulkpipe(serial->dev,
1072 				(port->bulk_in_endpointAddress) + 2),
1073 			port->bulk_in_buffer,
1074 			mos7840_port->read_urb->transfer_buffer_length,
1075 			mos7840_bulk_in_callback, mos7840_port);
1076 	} else {
1077 		usb_fill_bulk_urb(mos7840_port->read_urb,
1078 			serial->dev,
1079 			usb_rcvbulkpipe(serial->dev,
1080 				port->bulk_in_endpointAddress),
1081 			port->bulk_in_buffer,
1082 			mos7840_port->read_urb->transfer_buffer_length,
1083 			mos7840_bulk_in_callback, mos7840_port);
1084 	}
1085 
1086 	dev_dbg(&port->dev, "%s: bulkin endpoint is %d\n", __func__, port->bulk_in_endpointAddress);
1087 	mos7840_port->read_urb_busy = true;
1088 	response = usb_submit_urb(mos7840_port->read_urb, GFP_KERNEL);
1089 	if (response) {
1090 		dev_err(&port->dev, "%s - Error %d submitting control urb\n",
1091 			__func__, response);
1092 		mos7840_port->read_urb_busy = false;
1093 	}
1094 
1095 	/* initialize our port settings */
1096 	/* Must set to enable ints! */
1097 	mos7840_port->shadowMCR = MCR_MASTER_IE;
1098 	/* send a open port command */
1099 	mos7840_port->open = 1;
1100 	/* mos7840_change_port_settings(mos7840_port,old_termios); */
1101 
1102 	return 0;
1103 err:
1104 	for (j = 0; j < NUM_URBS; ++j) {
1105 		urb = mos7840_port->write_urb_pool[j];
1106 		if (!urb)
1107 			continue;
1108 		kfree(urb->transfer_buffer);
1109 		usb_free_urb(urb);
1110 	}
1111 	return status;
1112 }
1113 
1114 /*****************************************************************************
1115  * mos7840_chars_in_buffer
1116  *	this function is called by the tty driver when it wants to know how many
1117  *	bytes of data we currently have outstanding in the port (data that has
1118  *	been written, but hasn't made it out the port yet)
1119  *	If successful, we return the number of bytes left to be written in the
1120  *	system,
1121  *	Otherwise we return zero.
1122  *****************************************************************************/
1123 
1124 static int mos7840_chars_in_buffer(struct tty_struct *tty)
1125 {
1126 	struct usb_serial_port *port = tty->driver_data;
1127 	int i;
1128 	int chars = 0;
1129 	unsigned long flags;
1130 	struct moschip_port *mos7840_port;
1131 
1132 	if (mos7840_port_paranoia_check(port, __func__))
1133 		return 0;
1134 
1135 	mos7840_port = mos7840_get_port_private(port);
1136 	if (mos7840_port == NULL)
1137 		return 0;
1138 
1139 	spin_lock_irqsave(&mos7840_port->pool_lock, flags);
1140 	for (i = 0; i < NUM_URBS; ++i) {
1141 		if (mos7840_port->busy[i]) {
1142 			struct urb *urb = mos7840_port->write_urb_pool[i];
1143 			chars += urb->transfer_buffer_length;
1144 		}
1145 	}
1146 	spin_unlock_irqrestore(&mos7840_port->pool_lock, flags);
1147 	dev_dbg(&port->dev, "%s - returns %d\n", __func__, chars);
1148 	return chars;
1149 
1150 }
1151 
1152 /*****************************************************************************
1153  * mos7840_close
1154  *	this function is called by the tty driver when a port is closed
1155  *****************************************************************************/
1156 
1157 static void mos7840_close(struct usb_serial_port *port)
1158 {
1159 	struct usb_serial *serial;
1160 	struct moschip_port *mos7840_port;
1161 	struct moschip_port *port0;
1162 	int j;
1163 	__u16 Data;
1164 
1165 	if (mos7840_port_paranoia_check(port, __func__))
1166 		return;
1167 
1168 	serial = mos7840_get_usb_serial(port, __func__);
1169 	if (!serial)
1170 		return;
1171 
1172 	mos7840_port = mos7840_get_port_private(port);
1173 	port0 = mos7840_get_port_private(serial->port[0]);
1174 
1175 	if (mos7840_port == NULL || port0 == NULL)
1176 		return;
1177 
1178 	for (j = 0; j < NUM_URBS; ++j)
1179 		usb_kill_urb(mos7840_port->write_urb_pool[j]);
1180 
1181 	/* Freeing Write URBs */
1182 	for (j = 0; j < NUM_URBS; ++j) {
1183 		if (mos7840_port->write_urb_pool[j]) {
1184 			kfree(mos7840_port->write_urb_pool[j]->transfer_buffer);
1185 			usb_free_urb(mos7840_port->write_urb_pool[j]);
1186 		}
1187 	}
1188 
1189 	usb_kill_urb(mos7840_port->write_urb);
1190 	usb_kill_urb(mos7840_port->read_urb);
1191 	mos7840_port->read_urb_busy = false;
1192 
1193 	port0->open_ports--;
1194 	dev_dbg(&port->dev, "%s in close%d\n", __func__, port0->open_ports);
1195 	if (port0->open_ports == 0) {
1196 		if (serial->port[0]->interrupt_in_urb) {
1197 			dev_dbg(&port->dev, "Shutdown interrupt_in_urb\n");
1198 			usb_kill_urb(serial->port[0]->interrupt_in_urb);
1199 		}
1200 	}
1201 
1202 	if (mos7840_port->write_urb) {
1203 		/* if this urb had a transfer buffer already (old tx) free it */
1204 		kfree(mos7840_port->write_urb->transfer_buffer);
1205 		usb_free_urb(mos7840_port->write_urb);
1206 	}
1207 
1208 	Data = 0x0;
1209 	mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER, Data);
1210 
1211 	Data = 0x00;
1212 	mos7840_set_uart_reg(port, INTERRUPT_ENABLE_REGISTER, Data);
1213 
1214 	mos7840_port->open = 0;
1215 }
1216 
1217 /*****************************************************************************
1218  * mos7840_break
1219  *	this function sends a break to the port
1220  *****************************************************************************/
1221 static void mos7840_break(struct tty_struct *tty, int break_state)
1222 {
1223 	struct usb_serial_port *port = tty->driver_data;
1224 	unsigned char data;
1225 	struct usb_serial *serial;
1226 	struct moschip_port *mos7840_port;
1227 
1228 	if (mos7840_port_paranoia_check(port, __func__))
1229 		return;
1230 
1231 	serial = mos7840_get_usb_serial(port, __func__);
1232 	if (!serial)
1233 		return;
1234 
1235 	mos7840_port = mos7840_get_port_private(port);
1236 
1237 	if (mos7840_port == NULL)
1238 		return;
1239 
1240 	if (break_state == -1)
1241 		data = mos7840_port->shadowLCR | LCR_SET_BREAK;
1242 	else
1243 		data = mos7840_port->shadowLCR & ~LCR_SET_BREAK;
1244 
1245 	/* FIXME: no locking on shadowLCR anywhere in driver */
1246 	mos7840_port->shadowLCR = data;
1247 	dev_dbg(&port->dev, "%s mos7840_port->shadowLCR is %x\n", __func__, mos7840_port->shadowLCR);
1248 	mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER,
1249 			     mos7840_port->shadowLCR);
1250 }
1251 
1252 /*****************************************************************************
1253  * mos7840_write_room
1254  *	this function is called by the tty driver when it wants to know how many
1255  *	bytes of data we can accept for a specific port.
1256  *	If successful, we return the amount of room that we have for this port
1257  *	Otherwise we return a negative error number.
1258  *****************************************************************************/
1259 
1260 static int mos7840_write_room(struct tty_struct *tty)
1261 {
1262 	struct usb_serial_port *port = tty->driver_data;
1263 	int i;
1264 	int room = 0;
1265 	unsigned long flags;
1266 	struct moschip_port *mos7840_port;
1267 
1268 	if (mos7840_port_paranoia_check(port, __func__))
1269 		return -1;
1270 
1271 	mos7840_port = mos7840_get_port_private(port);
1272 	if (mos7840_port == NULL)
1273 		return -1;
1274 
1275 	spin_lock_irqsave(&mos7840_port->pool_lock, flags);
1276 	for (i = 0; i < NUM_URBS; ++i) {
1277 		if (!mos7840_port->busy[i])
1278 			room += URB_TRANSFER_BUFFER_SIZE;
1279 	}
1280 	spin_unlock_irqrestore(&mos7840_port->pool_lock, flags);
1281 
1282 	room = (room == 0) ? 0 : room - URB_TRANSFER_BUFFER_SIZE + 1;
1283 	dev_dbg(&mos7840_port->port->dev, "%s - returns %d\n", __func__, room);
1284 	return room;
1285 
1286 }
1287 
1288 /*****************************************************************************
1289  * mos7840_write
1290  *	this function is called by the tty driver when data should be written to
1291  *	the port.
1292  *	If successful, we return the number of bytes written, otherwise we
1293  *      return a negative error number.
1294  *****************************************************************************/
1295 
1296 static int mos7840_write(struct tty_struct *tty, struct usb_serial_port *port,
1297 			 const unsigned char *data, int count)
1298 {
1299 	int status;
1300 	int i;
1301 	int bytes_sent = 0;
1302 	int transfer_size;
1303 	unsigned long flags;
1304 
1305 	struct moschip_port *mos7840_port;
1306 	struct usb_serial *serial;
1307 	struct urb *urb;
1308 	/* __u16 Data; */
1309 	const unsigned char *current_position = data;
1310 	unsigned char *data1;
1311 
1312 	if (mos7840_port_paranoia_check(port, __func__))
1313 		return -1;
1314 
1315 	serial = port->serial;
1316 	if (mos7840_serial_paranoia_check(serial, __func__))
1317 		return -1;
1318 
1319 	mos7840_port = mos7840_get_port_private(port);
1320 	if (mos7840_port == NULL)
1321 		return -1;
1322 
1323 	/* try to find a free urb in the list */
1324 	urb = NULL;
1325 
1326 	spin_lock_irqsave(&mos7840_port->pool_lock, flags);
1327 	for (i = 0; i < NUM_URBS; ++i) {
1328 		if (!mos7840_port->busy[i]) {
1329 			mos7840_port->busy[i] = 1;
1330 			urb = mos7840_port->write_urb_pool[i];
1331 			dev_dbg(&port->dev, "URB:%d\n", i);
1332 			break;
1333 		}
1334 	}
1335 	spin_unlock_irqrestore(&mos7840_port->pool_lock, flags);
1336 
1337 	if (urb == NULL) {
1338 		dev_dbg(&port->dev, "%s - no more free urbs\n", __func__);
1339 		goto exit;
1340 	}
1341 
1342 	if (urb->transfer_buffer == NULL) {
1343 		urb->transfer_buffer =
1344 		    kmalloc(URB_TRANSFER_BUFFER_SIZE, GFP_KERNEL);
1345 		if (!urb->transfer_buffer)
1346 			goto exit;
1347 	}
1348 	transfer_size = min(count, URB_TRANSFER_BUFFER_SIZE);
1349 
1350 	memcpy(urb->transfer_buffer, current_position, transfer_size);
1351 
1352 	/* fill urb with data and submit  */
1353 	if ((serial->num_ports == 2) && (((__u16)port->port_number % 2) != 0)) {
1354 		usb_fill_bulk_urb(urb,
1355 			serial->dev,
1356 			usb_sndbulkpipe(serial->dev,
1357 				(port->bulk_out_endpointAddress) + 2),
1358 			urb->transfer_buffer,
1359 			transfer_size,
1360 			mos7840_bulk_out_data_callback, mos7840_port);
1361 	} else {
1362 		usb_fill_bulk_urb(urb,
1363 			serial->dev,
1364 			usb_sndbulkpipe(serial->dev,
1365 				port->bulk_out_endpointAddress),
1366 			urb->transfer_buffer,
1367 			transfer_size,
1368 			mos7840_bulk_out_data_callback, mos7840_port);
1369 	}
1370 
1371 	data1 = urb->transfer_buffer;
1372 	dev_dbg(&port->dev, "bulkout endpoint is %d\n", port->bulk_out_endpointAddress);
1373 
1374 	if (mos7840_port->has_led)
1375 		mos7840_led_activity(port);
1376 
1377 	/* send it down the pipe */
1378 	status = usb_submit_urb(urb, GFP_ATOMIC);
1379 
1380 	if (status) {
1381 		mos7840_port->busy[i] = 0;
1382 		dev_err_console(port, "%s - usb_submit_urb(write bulk) failed "
1383 			"with status = %d\n", __func__, status);
1384 		bytes_sent = status;
1385 		goto exit;
1386 	}
1387 	bytes_sent = transfer_size;
1388 	port->icount.tx += transfer_size;
1389 	dev_dbg(&port->dev, "icount.tx is %d:\n", port->icount.tx);
1390 exit:
1391 	return bytes_sent;
1392 
1393 }
1394 
1395 /*****************************************************************************
1396  * mos7840_throttle
1397  *	this function is called by the tty driver when it wants to stop the data
1398  *	being read from the port.
1399  *****************************************************************************/
1400 
1401 static void mos7840_throttle(struct tty_struct *tty)
1402 {
1403 	struct usb_serial_port *port = tty->driver_data;
1404 	struct moschip_port *mos7840_port;
1405 	int status;
1406 
1407 	if (mos7840_port_paranoia_check(port, __func__))
1408 		return;
1409 
1410 	mos7840_port = mos7840_get_port_private(port);
1411 
1412 	if (mos7840_port == NULL)
1413 		return;
1414 
1415 	if (!mos7840_port->open) {
1416 		dev_dbg(&port->dev, "%s", "port not opened\n");
1417 		return;
1418 	}
1419 
1420 	/* if we are implementing XON/XOFF, send the stop character */
1421 	if (I_IXOFF(tty)) {
1422 		unsigned char stop_char = STOP_CHAR(tty);
1423 		status = mos7840_write(tty, port, &stop_char, 1);
1424 		if (status <= 0)
1425 			return;
1426 	}
1427 	/* if we are implementing RTS/CTS, toggle that line */
1428 	if (C_CRTSCTS(tty)) {
1429 		mos7840_port->shadowMCR &= ~MCR_RTS;
1430 		status = mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER,
1431 					 mos7840_port->shadowMCR);
1432 		if (status < 0)
1433 			return;
1434 	}
1435 }
1436 
1437 /*****************************************************************************
1438  * mos7840_unthrottle
1439  *	this function is called by the tty driver when it wants to resume
1440  *	the data being read from the port (called after mos7840_throttle is
1441  *	called)
1442  *****************************************************************************/
1443 static void mos7840_unthrottle(struct tty_struct *tty)
1444 {
1445 	struct usb_serial_port *port = tty->driver_data;
1446 	int status;
1447 	struct moschip_port *mos7840_port = mos7840_get_port_private(port);
1448 
1449 	if (mos7840_port_paranoia_check(port, __func__))
1450 		return;
1451 
1452 	if (mos7840_port == NULL)
1453 		return;
1454 
1455 	if (!mos7840_port->open) {
1456 		dev_dbg(&port->dev, "%s - port not opened\n", __func__);
1457 		return;
1458 	}
1459 
1460 	/* if we are implementing XON/XOFF, send the start character */
1461 	if (I_IXOFF(tty)) {
1462 		unsigned char start_char = START_CHAR(tty);
1463 		status = mos7840_write(tty, port, &start_char, 1);
1464 		if (status <= 0)
1465 			return;
1466 	}
1467 
1468 	/* if we are implementing RTS/CTS, toggle that line */
1469 	if (C_CRTSCTS(tty)) {
1470 		mos7840_port->shadowMCR |= MCR_RTS;
1471 		status = mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER,
1472 					 mos7840_port->shadowMCR);
1473 		if (status < 0)
1474 			return;
1475 	}
1476 }
1477 
1478 static int mos7840_tiocmget(struct tty_struct *tty)
1479 {
1480 	struct usb_serial_port *port = tty->driver_data;
1481 	struct moschip_port *mos7840_port;
1482 	unsigned int result;
1483 	__u16 msr;
1484 	__u16 mcr;
1485 	int status;
1486 	mos7840_port = mos7840_get_port_private(port);
1487 
1488 	if (mos7840_port == NULL)
1489 		return -ENODEV;
1490 
1491 	status = mos7840_get_uart_reg(port, MODEM_STATUS_REGISTER, &msr);
1492 	if (status != 1)
1493 		return -EIO;
1494 	status = mos7840_get_uart_reg(port, MODEM_CONTROL_REGISTER, &mcr);
1495 	if (status != 1)
1496 		return -EIO;
1497 	result = ((mcr & MCR_DTR) ? TIOCM_DTR : 0)
1498 	    | ((mcr & MCR_RTS) ? TIOCM_RTS : 0)
1499 	    | ((mcr & MCR_LOOPBACK) ? TIOCM_LOOP : 0)
1500 	    | ((msr & MOS7840_MSR_CTS) ? TIOCM_CTS : 0)
1501 	    | ((msr & MOS7840_MSR_CD) ? TIOCM_CAR : 0)
1502 	    | ((msr & MOS7840_MSR_RI) ? TIOCM_RI : 0)
1503 	    | ((msr & MOS7840_MSR_DSR) ? TIOCM_DSR : 0);
1504 
1505 	dev_dbg(&port->dev, "%s - 0x%04X\n", __func__, result);
1506 
1507 	return result;
1508 }
1509 
1510 static int mos7840_tiocmset(struct tty_struct *tty,
1511 			    unsigned int set, unsigned int clear)
1512 {
1513 	struct usb_serial_port *port = tty->driver_data;
1514 	struct moschip_port *mos7840_port;
1515 	unsigned int mcr;
1516 	int status;
1517 
1518 	mos7840_port = mos7840_get_port_private(port);
1519 
1520 	if (mos7840_port == NULL)
1521 		return -ENODEV;
1522 
1523 	/* FIXME: What locks the port registers ? */
1524 	mcr = mos7840_port->shadowMCR;
1525 	if (clear & TIOCM_RTS)
1526 		mcr &= ~MCR_RTS;
1527 	if (clear & TIOCM_DTR)
1528 		mcr &= ~MCR_DTR;
1529 	if (clear & TIOCM_LOOP)
1530 		mcr &= ~MCR_LOOPBACK;
1531 
1532 	if (set & TIOCM_RTS)
1533 		mcr |= MCR_RTS;
1534 	if (set & TIOCM_DTR)
1535 		mcr |= MCR_DTR;
1536 	if (set & TIOCM_LOOP)
1537 		mcr |= MCR_LOOPBACK;
1538 
1539 	mos7840_port->shadowMCR = mcr;
1540 
1541 	status = mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER, mcr);
1542 	if (status < 0) {
1543 		dev_dbg(&port->dev, "setting MODEM_CONTROL_REGISTER Failed\n");
1544 		return status;
1545 	}
1546 
1547 	return 0;
1548 }
1549 
1550 /*****************************************************************************
1551  * mos7840_calc_baud_rate_divisor
1552  *	this function calculates the proper baud rate divisor for the specified
1553  *	baud rate.
1554  *****************************************************************************/
1555 static int mos7840_calc_baud_rate_divisor(struct usb_serial_port *port,
1556 					  int baudRate, int *divisor,
1557 					  __u16 *clk_sel_val)
1558 {
1559 	dev_dbg(&port->dev, "%s - %d\n", __func__, baudRate);
1560 
1561 	if (baudRate <= 115200) {
1562 		*divisor = 115200 / baudRate;
1563 		*clk_sel_val = 0x0;
1564 	}
1565 	if ((baudRate > 115200) && (baudRate <= 230400)) {
1566 		*divisor = 230400 / baudRate;
1567 		*clk_sel_val = 0x10;
1568 	} else if ((baudRate > 230400) && (baudRate <= 403200)) {
1569 		*divisor = 403200 / baudRate;
1570 		*clk_sel_val = 0x20;
1571 	} else if ((baudRate > 403200) && (baudRate <= 460800)) {
1572 		*divisor = 460800 / baudRate;
1573 		*clk_sel_val = 0x30;
1574 	} else if ((baudRate > 460800) && (baudRate <= 806400)) {
1575 		*divisor = 806400 / baudRate;
1576 		*clk_sel_val = 0x40;
1577 	} else if ((baudRate > 806400) && (baudRate <= 921600)) {
1578 		*divisor = 921600 / baudRate;
1579 		*clk_sel_val = 0x50;
1580 	} else if ((baudRate > 921600) && (baudRate <= 1572864)) {
1581 		*divisor = 1572864 / baudRate;
1582 		*clk_sel_val = 0x60;
1583 	} else if ((baudRate > 1572864) && (baudRate <= 3145728)) {
1584 		*divisor = 3145728 / baudRate;
1585 		*clk_sel_val = 0x70;
1586 	}
1587 	return 0;
1588 }
1589 
1590 /*****************************************************************************
1591  * mos7840_send_cmd_write_baud_rate
1592  *	this function sends the proper command to change the baud rate of the
1593  *	specified port.
1594  *****************************************************************************/
1595 
1596 static int mos7840_send_cmd_write_baud_rate(struct moschip_port *mos7840_port,
1597 					    int baudRate)
1598 {
1599 	int divisor = 0;
1600 	int status;
1601 	__u16 Data;
1602 	unsigned char number;
1603 	__u16 clk_sel_val;
1604 	struct usb_serial_port *port;
1605 
1606 	if (mos7840_port == NULL)
1607 		return -1;
1608 
1609 	port = mos7840_port->port;
1610 	if (mos7840_port_paranoia_check(port, __func__))
1611 		return -1;
1612 
1613 	if (mos7840_serial_paranoia_check(port->serial, __func__))
1614 		return -1;
1615 
1616 	number = mos7840_port->port->port_number;
1617 
1618 	dev_dbg(&port->dev, "%s - baud = %d\n", __func__, baudRate);
1619 	/* reset clk_uart_sel in spregOffset */
1620 	if (baudRate > 115200) {
1621 #ifdef HW_flow_control
1622 		/* NOTE: need to see the pther register to modify */
1623 		/* setting h/w flow control bit to 1 */
1624 		Data = 0x2b;
1625 		mos7840_port->shadowMCR = Data;
1626 		status = mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER,
1627 									Data);
1628 		if (status < 0) {
1629 			dev_dbg(&port->dev, "Writing spreg failed in set_serial_baud\n");
1630 			return -1;
1631 		}
1632 #endif
1633 
1634 	} else {
1635 #ifdef HW_flow_control
1636 		/* setting h/w flow control bit to 0 */
1637 		Data = 0xb;
1638 		mos7840_port->shadowMCR = Data;
1639 		status = mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER,
1640 									Data);
1641 		if (status < 0) {
1642 			dev_dbg(&port->dev, "Writing spreg failed in set_serial_baud\n");
1643 			return -1;
1644 		}
1645 #endif
1646 
1647 	}
1648 
1649 	if (1) {		/* baudRate <= 115200) */
1650 		clk_sel_val = 0x0;
1651 		Data = 0x0;
1652 		status = mos7840_calc_baud_rate_divisor(port, baudRate, &divisor,
1653 						   &clk_sel_val);
1654 		status = mos7840_get_reg_sync(port, mos7840_port->SpRegOffset,
1655 								 &Data);
1656 		if (status < 0) {
1657 			dev_dbg(&port->dev, "reading spreg failed in set_serial_baud\n");
1658 			return -1;
1659 		}
1660 		Data = (Data & 0x8f) | clk_sel_val;
1661 		status = mos7840_set_reg_sync(port, mos7840_port->SpRegOffset,
1662 								Data);
1663 		if (status < 0) {
1664 			dev_dbg(&port->dev, "Writing spreg failed in set_serial_baud\n");
1665 			return -1;
1666 		}
1667 		/* Calculate the Divisor */
1668 
1669 		if (status) {
1670 			dev_err(&port->dev, "%s - bad baud rate\n", __func__);
1671 			return status;
1672 		}
1673 		/* Enable access to divisor latch */
1674 		Data = mos7840_port->shadowLCR | SERIAL_LCR_DLAB;
1675 		mos7840_port->shadowLCR = Data;
1676 		mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data);
1677 
1678 		/* Write the divisor */
1679 		Data = (unsigned char)(divisor & 0xff);
1680 		dev_dbg(&port->dev, "set_serial_baud Value to write DLL is %x\n", Data);
1681 		mos7840_set_uart_reg(port, DIVISOR_LATCH_LSB, Data);
1682 
1683 		Data = (unsigned char)((divisor & 0xff00) >> 8);
1684 		dev_dbg(&port->dev, "set_serial_baud Value to write DLM is %x\n", Data);
1685 		mos7840_set_uart_reg(port, DIVISOR_LATCH_MSB, Data);
1686 
1687 		/* Disable access to divisor latch */
1688 		Data = mos7840_port->shadowLCR & ~SERIAL_LCR_DLAB;
1689 		mos7840_port->shadowLCR = Data;
1690 		mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data);
1691 
1692 	}
1693 	return status;
1694 }
1695 
1696 /*****************************************************************************
1697  * mos7840_change_port_settings
1698  *	This routine is called to set the UART on the device to match
1699  *      the specified new settings.
1700  *****************************************************************************/
1701 
1702 static void mos7840_change_port_settings(struct tty_struct *tty,
1703 	struct moschip_port *mos7840_port, struct ktermios *old_termios)
1704 {
1705 	int baud;
1706 	unsigned cflag;
1707 	unsigned iflag;
1708 	__u8 lData;
1709 	__u8 lParity;
1710 	__u8 lStop;
1711 	int status;
1712 	__u16 Data;
1713 	struct usb_serial_port *port;
1714 	struct usb_serial *serial;
1715 
1716 	if (mos7840_port == NULL)
1717 		return;
1718 
1719 	port = mos7840_port->port;
1720 
1721 	if (mos7840_port_paranoia_check(port, __func__))
1722 		return;
1723 
1724 	if (mos7840_serial_paranoia_check(port->serial, __func__))
1725 		return;
1726 
1727 	serial = port->serial;
1728 
1729 	if (!mos7840_port->open) {
1730 		dev_dbg(&port->dev, "%s - port not opened\n", __func__);
1731 		return;
1732 	}
1733 
1734 	lData = LCR_BITS_8;
1735 	lStop = LCR_STOP_1;
1736 	lParity = LCR_PAR_NONE;
1737 
1738 	cflag = tty->termios.c_cflag;
1739 	iflag = tty->termios.c_iflag;
1740 
1741 	/* Change the number of bits */
1742 	switch (cflag & CSIZE) {
1743 	case CS5:
1744 		lData = LCR_BITS_5;
1745 		break;
1746 
1747 	case CS6:
1748 		lData = LCR_BITS_6;
1749 		break;
1750 
1751 	case CS7:
1752 		lData = LCR_BITS_7;
1753 		break;
1754 
1755 	default:
1756 	case CS8:
1757 		lData = LCR_BITS_8;
1758 		break;
1759 	}
1760 
1761 	/* Change the Parity bit */
1762 	if (cflag & PARENB) {
1763 		if (cflag & PARODD) {
1764 			lParity = LCR_PAR_ODD;
1765 			dev_dbg(&port->dev, "%s - parity = odd\n", __func__);
1766 		} else {
1767 			lParity = LCR_PAR_EVEN;
1768 			dev_dbg(&port->dev, "%s - parity = even\n", __func__);
1769 		}
1770 
1771 	} else {
1772 		dev_dbg(&port->dev, "%s - parity = none\n", __func__);
1773 	}
1774 
1775 	if (cflag & CMSPAR)
1776 		lParity = lParity | 0x20;
1777 
1778 	/* Change the Stop bit */
1779 	if (cflag & CSTOPB) {
1780 		lStop = LCR_STOP_2;
1781 		dev_dbg(&port->dev, "%s - stop bits = 2\n", __func__);
1782 	} else {
1783 		lStop = LCR_STOP_1;
1784 		dev_dbg(&port->dev, "%s - stop bits = 1\n", __func__);
1785 	}
1786 
1787 	/* Update the LCR with the correct value */
1788 	mos7840_port->shadowLCR &=
1789 	    ~(LCR_BITS_MASK | LCR_STOP_MASK | LCR_PAR_MASK);
1790 	mos7840_port->shadowLCR |= (lData | lParity | lStop);
1791 
1792 	dev_dbg(&port->dev, "%s - mos7840_port->shadowLCR is %x\n", __func__,
1793 		mos7840_port->shadowLCR);
1794 	/* Disable Interrupts */
1795 	Data = 0x00;
1796 	mos7840_set_uart_reg(port, INTERRUPT_ENABLE_REGISTER, Data);
1797 
1798 	Data = 0x00;
1799 	mos7840_set_uart_reg(port, FIFO_CONTROL_REGISTER, Data);
1800 
1801 	Data = 0xcf;
1802 	mos7840_set_uart_reg(port, FIFO_CONTROL_REGISTER, Data);
1803 
1804 	/* Send the updated LCR value to the mos7840 */
1805 	Data = mos7840_port->shadowLCR;
1806 
1807 	mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data);
1808 
1809 	Data = 0x00b;
1810 	mos7840_port->shadowMCR = Data;
1811 	mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER, Data);
1812 	Data = 0x00b;
1813 	mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER, Data);
1814 
1815 	/* set up the MCR register and send it to the mos7840 */
1816 
1817 	mos7840_port->shadowMCR = MCR_MASTER_IE;
1818 	if (cflag & CBAUD)
1819 		mos7840_port->shadowMCR |= (MCR_DTR | MCR_RTS);
1820 
1821 	if (cflag & CRTSCTS)
1822 		mos7840_port->shadowMCR |= (MCR_XON_ANY);
1823 	else
1824 		mos7840_port->shadowMCR &= ~(MCR_XON_ANY);
1825 
1826 	Data = mos7840_port->shadowMCR;
1827 	mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER, Data);
1828 
1829 	/* Determine divisor based on baud rate */
1830 	baud = tty_get_baud_rate(tty);
1831 
1832 	if (!baud) {
1833 		/* pick a default, any default... */
1834 		dev_dbg(&port->dev, "%s", "Picked default baud...\n");
1835 		baud = 9600;
1836 	}
1837 
1838 	dev_dbg(&port->dev, "%s - baud rate = %d\n", __func__, baud);
1839 	status = mos7840_send_cmd_write_baud_rate(mos7840_port, baud);
1840 
1841 	/* Enable Interrupts */
1842 	Data = 0x0c;
1843 	mos7840_set_uart_reg(port, INTERRUPT_ENABLE_REGISTER, Data);
1844 
1845 	if (!mos7840_port->read_urb_busy) {
1846 		mos7840_port->read_urb_busy = true;
1847 		status = usb_submit_urb(mos7840_port->read_urb, GFP_KERNEL);
1848 		if (status) {
1849 			dev_dbg(&port->dev, "usb_submit_urb(read bulk) failed, status = %d\n",
1850 			    status);
1851 			mos7840_port->read_urb_busy = false;
1852 		}
1853 	}
1854 	dev_dbg(&port->dev, "%s - mos7840_port->shadowLCR is End %x\n", __func__,
1855 		mos7840_port->shadowLCR);
1856 }
1857 
1858 /*****************************************************************************
1859  * mos7840_set_termios
1860  *	this function is called by the tty driver when it wants to change
1861  *	the termios structure
1862  *****************************************************************************/
1863 
1864 static void mos7840_set_termios(struct tty_struct *tty,
1865 				struct usb_serial_port *port,
1866 				struct ktermios *old_termios)
1867 {
1868 	int status;
1869 	unsigned int cflag;
1870 	struct usb_serial *serial;
1871 	struct moschip_port *mos7840_port;
1872 
1873 	if (mos7840_port_paranoia_check(port, __func__))
1874 		return;
1875 
1876 	serial = port->serial;
1877 
1878 	if (mos7840_serial_paranoia_check(serial, __func__))
1879 		return;
1880 
1881 	mos7840_port = mos7840_get_port_private(port);
1882 
1883 	if (mos7840_port == NULL)
1884 		return;
1885 
1886 	if (!mos7840_port->open) {
1887 		dev_dbg(&port->dev, "%s - port not opened\n", __func__);
1888 		return;
1889 	}
1890 
1891 	dev_dbg(&port->dev, "%s", "setting termios - \n");
1892 
1893 	cflag = tty->termios.c_cflag;
1894 
1895 	dev_dbg(&port->dev, "%s - clfag %08x iflag %08x\n", __func__,
1896 		tty->termios.c_cflag, RELEVANT_IFLAG(tty->termios.c_iflag));
1897 	dev_dbg(&port->dev, "%s - old clfag %08x old iflag %08x\n", __func__,
1898 		old_termios->c_cflag, RELEVANT_IFLAG(old_termios->c_iflag));
1899 
1900 	/* change the port settings to the new ones specified */
1901 
1902 	mos7840_change_port_settings(tty, mos7840_port, old_termios);
1903 
1904 	if (!mos7840_port->read_urb) {
1905 		dev_dbg(&port->dev, "%s", "URB KILLED !!!!!\n");
1906 		return;
1907 	}
1908 
1909 	if (!mos7840_port->read_urb_busy) {
1910 		mos7840_port->read_urb_busy = true;
1911 		status = usb_submit_urb(mos7840_port->read_urb, GFP_KERNEL);
1912 		if (status) {
1913 			dev_dbg(&port->dev, "usb_submit_urb(read bulk) failed, status = %d\n",
1914 			    status);
1915 			mos7840_port->read_urb_busy = false;
1916 		}
1917 	}
1918 }
1919 
1920 /*****************************************************************************
1921  * mos7840_get_lsr_info - get line status register info
1922  *
1923  * Purpose: Let user call ioctl() to get info when the UART physically
1924  * 	    is emptied.  On bus types like RS485, the transmitter must
1925  * 	    release the bus after transmitting. This must be done when
1926  * 	    the transmit shift register is empty, not be done when the
1927  * 	    transmit holding register is empty.  This functionality
1928  * 	    allows an RS485 driver to be written in user space.
1929  *****************************************************************************/
1930 
1931 static int mos7840_get_lsr_info(struct tty_struct *tty,
1932 				unsigned int __user *value)
1933 {
1934 	int count;
1935 	unsigned int result = 0;
1936 
1937 	count = mos7840_chars_in_buffer(tty);
1938 	if (count == 0)
1939 		result = TIOCSER_TEMT;
1940 
1941 	if (copy_to_user(value, &result, sizeof(int)))
1942 		return -EFAULT;
1943 	return 0;
1944 }
1945 
1946 /*****************************************************************************
1947  * mos7840_get_serial_info
1948  *      function to get information about serial port
1949  *****************************************************************************/
1950 
1951 static int mos7840_get_serial_info(struct moschip_port *mos7840_port,
1952 				   struct serial_struct __user *retinfo)
1953 {
1954 	struct serial_struct tmp;
1955 
1956 	if (mos7840_port == NULL)
1957 		return -1;
1958 
1959 	if (!retinfo)
1960 		return -EFAULT;
1961 
1962 	memset(&tmp, 0, sizeof(tmp));
1963 
1964 	tmp.type = PORT_16550A;
1965 	tmp.line = mos7840_port->port->minor;
1966 	tmp.port = mos7840_port->port->port_number;
1967 	tmp.irq = 0;
1968 	tmp.flags = ASYNC_SKIP_TEST | ASYNC_AUTO_IRQ;
1969 	tmp.xmit_fifo_size = NUM_URBS * URB_TRANSFER_BUFFER_SIZE;
1970 	tmp.baud_base = 9600;
1971 	tmp.close_delay = 5 * HZ;
1972 	tmp.closing_wait = 30 * HZ;
1973 
1974 	if (copy_to_user(retinfo, &tmp, sizeof(*retinfo)))
1975 		return -EFAULT;
1976 	return 0;
1977 }
1978 
1979 /*****************************************************************************
1980  * SerialIoctl
1981  *	this function handles any ioctl calls to the driver
1982  *****************************************************************************/
1983 
1984 static int mos7840_ioctl(struct tty_struct *tty,
1985 			 unsigned int cmd, unsigned long arg)
1986 {
1987 	struct usb_serial_port *port = tty->driver_data;
1988 	void __user *argp = (void __user *)arg;
1989 	struct moschip_port *mos7840_port;
1990 
1991 	if (mos7840_port_paranoia_check(port, __func__))
1992 		return -1;
1993 
1994 	mos7840_port = mos7840_get_port_private(port);
1995 
1996 	if (mos7840_port == NULL)
1997 		return -1;
1998 
1999 	switch (cmd) {
2000 		/* return number of bytes available */
2001 
2002 	case TIOCSERGETLSR:
2003 		dev_dbg(&port->dev, "%s TIOCSERGETLSR\n", __func__);
2004 		return mos7840_get_lsr_info(tty, argp);
2005 
2006 	case TIOCGSERIAL:
2007 		dev_dbg(&port->dev, "%s TIOCGSERIAL\n", __func__);
2008 		return mos7840_get_serial_info(mos7840_port, argp);
2009 
2010 	case TIOCSSERIAL:
2011 		dev_dbg(&port->dev, "%s TIOCSSERIAL\n", __func__);
2012 		break;
2013 	default:
2014 		break;
2015 	}
2016 	return -ENOIOCTLCMD;
2017 }
2018 
2019 static int mos7810_check(struct usb_serial *serial)
2020 {
2021 	int i, pass_count = 0;
2022 	u8 *buf;
2023 	__u16 data = 0, mcr_data = 0;
2024 	__u16 test_pattern = 0x55AA;
2025 	int res;
2026 
2027 	buf = kmalloc(VENDOR_READ_LENGTH, GFP_KERNEL);
2028 	if (!buf)
2029 		return 0;	/* failed to identify 7810 */
2030 
2031 	/* Store MCR setting */
2032 	res = usb_control_msg(serial->dev, usb_rcvctrlpipe(serial->dev, 0),
2033 		MCS_RDREQ, MCS_RD_RTYPE, 0x0300, MODEM_CONTROL_REGISTER,
2034 		buf, VENDOR_READ_LENGTH, MOS_WDR_TIMEOUT);
2035 	if (res == VENDOR_READ_LENGTH)
2036 		mcr_data = *buf;
2037 
2038 	for (i = 0; i < 16; i++) {
2039 		/* Send the 1-bit test pattern out to MCS7810 test pin */
2040 		usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0),
2041 			MCS_WRREQ, MCS_WR_RTYPE,
2042 			(0x0300 | (((test_pattern >> i) & 0x0001) << 1)),
2043 			MODEM_CONTROL_REGISTER, NULL, 0, MOS_WDR_TIMEOUT);
2044 
2045 		/* Read the test pattern back */
2046 		res = usb_control_msg(serial->dev,
2047 				usb_rcvctrlpipe(serial->dev, 0), MCS_RDREQ,
2048 				MCS_RD_RTYPE, 0, GPIO_REGISTER, buf,
2049 				VENDOR_READ_LENGTH, MOS_WDR_TIMEOUT);
2050 		if (res == VENDOR_READ_LENGTH)
2051 			data = *buf;
2052 
2053 		/* If this is a MCS7810 device, both test patterns must match */
2054 		if (((test_pattern >> i) ^ (~data >> 1)) & 0x0001)
2055 			break;
2056 
2057 		pass_count++;
2058 	}
2059 
2060 	/* Restore MCR setting */
2061 	usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0), MCS_WRREQ,
2062 		MCS_WR_RTYPE, 0x0300 | mcr_data, MODEM_CONTROL_REGISTER, NULL,
2063 		0, MOS_WDR_TIMEOUT);
2064 
2065 	kfree(buf);
2066 
2067 	if (pass_count == 16)
2068 		return 1;
2069 
2070 	return 0;
2071 }
2072 
2073 static int mos7840_probe(struct usb_serial *serial,
2074 				const struct usb_device_id *id)
2075 {
2076 	u16 product = le16_to_cpu(serial->dev->descriptor.idProduct);
2077 	u8 *buf;
2078 	int device_type;
2079 
2080 	if (product == MOSCHIP_DEVICE_ID_7810 ||
2081 		product == MOSCHIP_DEVICE_ID_7820) {
2082 		device_type = product;
2083 		goto out;
2084 	}
2085 
2086 	buf = kzalloc(VENDOR_READ_LENGTH, GFP_KERNEL);
2087 	if (!buf)
2088 		return -ENOMEM;
2089 
2090 	usb_control_msg(serial->dev, usb_rcvctrlpipe(serial->dev, 0),
2091 			MCS_RDREQ, MCS_RD_RTYPE, 0, GPIO_REGISTER, buf,
2092 			VENDOR_READ_LENGTH, MOS_WDR_TIMEOUT);
2093 
2094 	/* For a MCS7840 device GPIO0 must be set to 1 */
2095 	if (buf[0] & 0x01)
2096 		device_type = MOSCHIP_DEVICE_ID_7840;
2097 	else if (mos7810_check(serial))
2098 		device_type = MOSCHIP_DEVICE_ID_7810;
2099 	else
2100 		device_type = MOSCHIP_DEVICE_ID_7820;
2101 
2102 	kfree(buf);
2103 out:
2104 	usb_set_serial_data(serial, (void *)(unsigned long)device_type);
2105 
2106 	return 0;
2107 }
2108 
2109 static int mos7840_calc_num_ports(struct usb_serial *serial)
2110 {
2111 	int device_type = (unsigned long)usb_get_serial_data(serial);
2112 	int mos7840_num_ports;
2113 
2114 	mos7840_num_ports = (device_type >> 4) & 0x000F;
2115 
2116 	return mos7840_num_ports;
2117 }
2118 
2119 static int mos7840_port_probe(struct usb_serial_port *port)
2120 {
2121 	struct usb_serial *serial = port->serial;
2122 	int device_type = (unsigned long)usb_get_serial_data(serial);
2123 	struct moschip_port *mos7840_port;
2124 	int status;
2125 	int pnum;
2126 	__u16 Data;
2127 
2128 	/* we set up the pointers to the endpoints in the mos7840_open *
2129 	 * function, as the structures aren't created yet.             */
2130 
2131 	pnum = port->port_number;
2132 
2133 	dev_dbg(&port->dev, "mos7840_startup: configuring port %d\n", pnum);
2134 	mos7840_port = kzalloc(sizeof(struct moschip_port), GFP_KERNEL);
2135 	if (!mos7840_port)
2136 		return -ENOMEM;
2137 
2138 	/* Initialize all port interrupt end point to port 0 int
2139 	 * endpoint. Our device has only one interrupt end point
2140 	 * common to all port */
2141 
2142 	mos7840_port->port = port;
2143 	mos7840_set_port_private(port, mos7840_port);
2144 	spin_lock_init(&mos7840_port->pool_lock);
2145 
2146 	/* minor is not initialised until later by
2147 	 * usb-serial.c:get_free_serial() and cannot therefore be used
2148 	 * to index device instances */
2149 	mos7840_port->port_num = pnum + 1;
2150 	dev_dbg(&port->dev, "port->minor = %d\n", port->minor);
2151 	dev_dbg(&port->dev, "mos7840_port->port_num = %d\n", mos7840_port->port_num);
2152 
2153 	if (mos7840_port->port_num == 1) {
2154 		mos7840_port->SpRegOffset = 0x0;
2155 		mos7840_port->ControlRegOffset = 0x1;
2156 		mos7840_port->DcrRegOffset = 0x4;
2157 	} else if ((mos7840_port->port_num == 2) && (serial->num_ports == 4)) {
2158 		mos7840_port->SpRegOffset = 0x8;
2159 		mos7840_port->ControlRegOffset = 0x9;
2160 		mos7840_port->DcrRegOffset = 0x16;
2161 	} else if ((mos7840_port->port_num == 2) && (serial->num_ports == 2)) {
2162 		mos7840_port->SpRegOffset = 0xa;
2163 		mos7840_port->ControlRegOffset = 0xb;
2164 		mos7840_port->DcrRegOffset = 0x19;
2165 	} else if ((mos7840_port->port_num == 3) && (serial->num_ports == 4)) {
2166 		mos7840_port->SpRegOffset = 0xa;
2167 		mos7840_port->ControlRegOffset = 0xb;
2168 		mos7840_port->DcrRegOffset = 0x19;
2169 	} else if ((mos7840_port->port_num == 4) && (serial->num_ports == 4)) {
2170 		mos7840_port->SpRegOffset = 0xc;
2171 		mos7840_port->ControlRegOffset = 0xd;
2172 		mos7840_port->DcrRegOffset = 0x1c;
2173 	}
2174 	mos7840_dump_serial_port(port, mos7840_port);
2175 	mos7840_set_port_private(port, mos7840_port);
2176 
2177 	/* enable rx_disable bit in control register */
2178 	status = mos7840_get_reg_sync(port,
2179 			mos7840_port->ControlRegOffset, &Data);
2180 	if (status < 0) {
2181 		dev_dbg(&port->dev, "Reading ControlReg failed status-0x%x\n", status);
2182 		goto out;
2183 	} else
2184 		dev_dbg(&port->dev, "ControlReg Reading success val is %x, status%d\n", Data, status);
2185 	Data |= 0x08;	/* setting driver done bit */
2186 	Data |= 0x04;	/* sp1_bit to have cts change reflect in
2187 			   modem status reg */
2188 
2189 	/* Data |= 0x20; //rx_disable bit */
2190 	status = mos7840_set_reg_sync(port,
2191 			mos7840_port->ControlRegOffset, Data);
2192 	if (status < 0) {
2193 		dev_dbg(&port->dev, "Writing ControlReg failed(rx_disable) status-0x%x\n", status);
2194 		goto out;
2195 	} else
2196 		dev_dbg(&port->dev, "ControlReg Writing success(rx_disable) status%d\n", status);
2197 
2198 	/* Write default values in DCR (i.e 0x01 in DCR0, 0x05 in DCR2
2199 	   and 0x24 in DCR3 */
2200 	Data = 0x01;
2201 	status = mos7840_set_reg_sync(port,
2202 			(__u16) (mos7840_port->DcrRegOffset + 0), Data);
2203 	if (status < 0) {
2204 		dev_dbg(&port->dev, "Writing DCR0 failed status-0x%x\n", status);
2205 		goto out;
2206 	} else
2207 		dev_dbg(&port->dev, "DCR0 Writing success status%d\n", status);
2208 
2209 	Data = 0x05;
2210 	status = mos7840_set_reg_sync(port,
2211 			(__u16) (mos7840_port->DcrRegOffset + 1), Data);
2212 	if (status < 0) {
2213 		dev_dbg(&port->dev, "Writing DCR1 failed status-0x%x\n", status);
2214 		goto out;
2215 	} else
2216 		dev_dbg(&port->dev, "DCR1 Writing success status%d\n", status);
2217 
2218 	Data = 0x24;
2219 	status = mos7840_set_reg_sync(port,
2220 			(__u16) (mos7840_port->DcrRegOffset + 2), Data);
2221 	if (status < 0) {
2222 		dev_dbg(&port->dev, "Writing DCR2 failed status-0x%x\n", status);
2223 		goto out;
2224 	} else
2225 		dev_dbg(&port->dev, "DCR2 Writing success status%d\n", status);
2226 
2227 	/* write values in clkstart0x0 and clkmulti 0x20 */
2228 	Data = 0x0;
2229 	status = mos7840_set_reg_sync(port, CLK_START_VALUE_REGISTER, Data);
2230 	if (status < 0) {
2231 		dev_dbg(&port->dev, "Writing CLK_START_VALUE_REGISTER failed status-0x%x\n", status);
2232 		goto out;
2233 	} else
2234 		dev_dbg(&port->dev, "CLK_START_VALUE_REGISTER Writing success status%d\n", status);
2235 
2236 	Data = 0x20;
2237 	status = mos7840_set_reg_sync(port, CLK_MULTI_REGISTER, Data);
2238 	if (status < 0) {
2239 		dev_dbg(&port->dev, "Writing CLK_MULTI_REGISTER failed status-0x%x\n", status);
2240 		goto error;
2241 	} else
2242 		dev_dbg(&port->dev, "CLK_MULTI_REGISTER Writing success status%d\n", status);
2243 
2244 	/* write value 0x0 to scratchpad register */
2245 	Data = 0x00;
2246 	status = mos7840_set_uart_reg(port, SCRATCH_PAD_REGISTER, Data);
2247 	if (status < 0) {
2248 		dev_dbg(&port->dev, "Writing SCRATCH_PAD_REGISTER failed status-0x%x\n", status);
2249 		goto out;
2250 	} else
2251 		dev_dbg(&port->dev, "SCRATCH_PAD_REGISTER Writing success status%d\n", status);
2252 
2253 	/* Zero Length flag register */
2254 	if ((mos7840_port->port_num != 1) && (serial->num_ports == 2)) {
2255 		Data = 0xff;
2256 		status = mos7840_set_reg_sync(port,
2257 				(__u16) (ZLP_REG1 +
2258 					((__u16)mos7840_port->port_num)), Data);
2259 		dev_dbg(&port->dev, "ZLIP offset %x\n",
2260 				(__u16)(ZLP_REG1 + ((__u16) mos7840_port->port_num)));
2261 		if (status < 0) {
2262 			dev_dbg(&port->dev, "Writing ZLP_REG%d failed status-0x%x\n", pnum + 2, status);
2263 			goto out;
2264 		} else
2265 			dev_dbg(&port->dev, "ZLP_REG%d Writing success status%d\n", pnum + 2, status);
2266 	} else {
2267 		Data = 0xff;
2268 		status = mos7840_set_reg_sync(port,
2269 				(__u16) (ZLP_REG1 +
2270 					((__u16)mos7840_port->port_num) - 0x1), Data);
2271 		dev_dbg(&port->dev, "ZLIP offset %x\n",
2272 				(__u16)(ZLP_REG1 + ((__u16) mos7840_port->port_num) - 0x1));
2273 		if (status < 0) {
2274 			dev_dbg(&port->dev, "Writing ZLP_REG%d failed status-0x%x\n", pnum + 1, status);
2275 			goto out;
2276 		} else
2277 			dev_dbg(&port->dev, "ZLP_REG%d Writing success status%d\n", pnum + 1, status);
2278 
2279 	}
2280 	mos7840_port->control_urb = usb_alloc_urb(0, GFP_KERNEL);
2281 	mos7840_port->ctrl_buf = kmalloc(16, GFP_KERNEL);
2282 	mos7840_port->dr = kmalloc(sizeof(struct usb_ctrlrequest),
2283 			GFP_KERNEL);
2284 	if (!mos7840_port->control_urb || !mos7840_port->ctrl_buf ||
2285 			!mos7840_port->dr) {
2286 		status = -ENOMEM;
2287 		goto error;
2288 	}
2289 
2290 	mos7840_port->has_led = false;
2291 
2292 	/* Initialize LED timers */
2293 	if (device_type == MOSCHIP_DEVICE_ID_7810) {
2294 		mos7840_port->has_led = true;
2295 
2296 		mos7840_port->led_urb = usb_alloc_urb(0, GFP_KERNEL);
2297 		mos7840_port->led_dr = kmalloc(sizeof(*mos7840_port->led_dr),
2298 								GFP_KERNEL);
2299 		if (!mos7840_port->led_urb || !mos7840_port->led_dr) {
2300 			status = -ENOMEM;
2301 			goto error;
2302 		}
2303 
2304 		setup_timer(&mos7840_port->led_timer1, mos7840_led_off,
2305 			    (unsigned long)mos7840_port);
2306 		mos7840_port->led_timer1.expires =
2307 			jiffies + msecs_to_jiffies(LED_ON_MS);
2308 		setup_timer(&mos7840_port->led_timer2, mos7840_led_flag_off,
2309 			    (unsigned long)mos7840_port);
2310 		mos7840_port->led_timer2.expires =
2311 			jiffies + msecs_to_jiffies(LED_OFF_MS);
2312 
2313 		/* Turn off LED */
2314 		mos7840_set_led_sync(port, MODEM_CONTROL_REGISTER, 0x0300);
2315 	}
2316 out:
2317 	if (pnum == serial->num_ports - 1) {
2318 		/* Zero Length flag enable */
2319 		Data = 0x0f;
2320 		status = mos7840_set_reg_sync(serial->port[0], ZLP_REG5, Data);
2321 		if (status < 0) {
2322 			dev_dbg(&port->dev, "Writing ZLP_REG5 failed status-0x%x\n", status);
2323 			goto error;
2324 		} else
2325 			dev_dbg(&port->dev, "ZLP_REG5 Writing success status%d\n", status);
2326 
2327 		/* setting configuration feature to one */
2328 		usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0),
2329 				0x03, 0x00, 0x01, 0x00, NULL, 0x00,
2330 				MOS_WDR_TIMEOUT);
2331 	}
2332 	return 0;
2333 error:
2334 	kfree(mos7840_port->led_dr);
2335 	usb_free_urb(mos7840_port->led_urb);
2336 	kfree(mos7840_port->dr);
2337 	kfree(mos7840_port->ctrl_buf);
2338 	usb_free_urb(mos7840_port->control_urb);
2339 	kfree(mos7840_port);
2340 
2341 	return status;
2342 }
2343 
2344 static int mos7840_port_remove(struct usb_serial_port *port)
2345 {
2346 	struct moschip_port *mos7840_port;
2347 
2348 	mos7840_port = mos7840_get_port_private(port);
2349 
2350 	if (mos7840_port->has_led) {
2351 		/* Turn off LED */
2352 		mos7840_set_led_sync(port, MODEM_CONTROL_REGISTER, 0x0300);
2353 
2354 		del_timer_sync(&mos7840_port->led_timer1);
2355 		del_timer_sync(&mos7840_port->led_timer2);
2356 
2357 		usb_kill_urb(mos7840_port->led_urb);
2358 		usb_free_urb(mos7840_port->led_urb);
2359 		kfree(mos7840_port->led_dr);
2360 	}
2361 	usb_kill_urb(mos7840_port->control_urb);
2362 	usb_free_urb(mos7840_port->control_urb);
2363 	kfree(mos7840_port->ctrl_buf);
2364 	kfree(mos7840_port->dr);
2365 	kfree(mos7840_port);
2366 
2367 	return 0;
2368 }
2369 
2370 static struct usb_serial_driver moschip7840_4port_device = {
2371 	.driver = {
2372 		   .owner = THIS_MODULE,
2373 		   .name = "mos7840",
2374 		   },
2375 	.description = DRIVER_DESC,
2376 	.id_table = id_table,
2377 	.num_ports = 4,
2378 	.open = mos7840_open,
2379 	.close = mos7840_close,
2380 	.write = mos7840_write,
2381 	.write_room = mos7840_write_room,
2382 	.chars_in_buffer = mos7840_chars_in_buffer,
2383 	.throttle = mos7840_throttle,
2384 	.unthrottle = mos7840_unthrottle,
2385 	.calc_num_ports = mos7840_calc_num_ports,
2386 	.probe = mos7840_probe,
2387 	.ioctl = mos7840_ioctl,
2388 	.set_termios = mos7840_set_termios,
2389 	.break_ctl = mos7840_break,
2390 	.tiocmget = mos7840_tiocmget,
2391 	.tiocmset = mos7840_tiocmset,
2392 	.tiocmiwait = usb_serial_generic_tiocmiwait,
2393 	.get_icount = usb_serial_generic_get_icount,
2394 	.port_probe = mos7840_port_probe,
2395 	.port_remove = mos7840_port_remove,
2396 	.read_bulk_callback = mos7840_bulk_in_callback,
2397 	.read_int_callback = mos7840_interrupt_callback,
2398 };
2399 
2400 static struct usb_serial_driver * const serial_drivers[] = {
2401 	&moschip7840_4port_device, NULL
2402 };
2403 
2404 module_usb_serial_driver(serial_drivers, id_table);
2405 
2406 MODULE_DESCRIPTION(DRIVER_DESC);
2407 MODULE_LICENSE("GPL");
2408