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
185enum mos7840_flag {
186	MOS7840_FLAG_CTRL_BUSY,
187	MOS7840_FLAG_LED_BUSY,
188};
189
190static 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};
211MODULE_DEVICE_TABLE(usb, id_table);
212
213/* This structure holds all of the local port information */
214
215struct 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
256static 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
274static 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
301static 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 */
330static 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
362static 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
379static 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
385static 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
392static 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
416static 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
448static 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);
483out:
484	clear_bit_unlock(MOS7840_FLAG_CTRL_BUSY, &mos7840_port->flags);
485}
486
487static 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
515static 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
534static 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
552static 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
561static 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
571static 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
578static 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
596static 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 && 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;
676exit:
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
685static 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 */
701static 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
716static 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
737static 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
803static 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
845static 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;
1103err:
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
1124static 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
1157static 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 *****************************************************************************/
1221static 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
1260static 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
1296static 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);
1390exit:
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
1401static 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 (tty->termios.c_cflag & CRTSCTS) {
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 *****************************************************************************/
1443static 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 (tty->termios.c_cflag & CRTSCTS) {
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
1478static 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
1510static 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 *****************************************************************************/
1555static 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
1596static 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
1702static 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 == false) {
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
1864static 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 == false) {
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
1931static 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
1951static 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
1984static 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
2019static 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
2073static 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);
2103out:
2104	usb_set_serial_data(serial, (void *)(unsigned long)device_type);
2105
2106	return 0;
2107}
2108
2109static 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
2119static 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		init_timer(&mos7840_port->led_timer1);
2305		mos7840_port->led_timer1.function = mos7840_led_off;
2306		mos7840_port->led_timer1.expires =
2307			jiffies + msecs_to_jiffies(LED_ON_MS);
2308		mos7840_port->led_timer1.data = (unsigned long)mos7840_port;
2309
2310		init_timer(&mos7840_port->led_timer2);
2311		mos7840_port->led_timer2.function = mos7840_led_flag_off;
2312		mos7840_port->led_timer2.expires =
2313			jiffies + msecs_to_jiffies(LED_OFF_MS);
2314		mos7840_port->led_timer2.data = (unsigned long)mos7840_port;
2315
2316		/* Turn off LED */
2317		mos7840_set_led_sync(port, MODEM_CONTROL_REGISTER, 0x0300);
2318	}
2319out:
2320	if (pnum == serial->num_ports - 1) {
2321		/* Zero Length flag enable */
2322		Data = 0x0f;
2323		status = mos7840_set_reg_sync(serial->port[0], ZLP_REG5, Data);
2324		if (status < 0) {
2325			dev_dbg(&port->dev, "Writing ZLP_REG5 failed status-0x%x\n", status);
2326			goto error;
2327		} else
2328			dev_dbg(&port->dev, "ZLP_REG5 Writing success status%d\n", status);
2329
2330		/* setting configuration feature to one */
2331		usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0),
2332				0x03, 0x00, 0x01, 0x00, NULL, 0x00,
2333				MOS_WDR_TIMEOUT);
2334	}
2335	return 0;
2336error:
2337	kfree(mos7840_port->led_dr);
2338	usb_free_urb(mos7840_port->led_urb);
2339	kfree(mos7840_port->dr);
2340	kfree(mos7840_port->ctrl_buf);
2341	usb_free_urb(mos7840_port->control_urb);
2342	kfree(mos7840_port);
2343
2344	return status;
2345}
2346
2347static int mos7840_port_remove(struct usb_serial_port *port)
2348{
2349	struct moschip_port *mos7840_port;
2350
2351	mos7840_port = mos7840_get_port_private(port);
2352
2353	if (mos7840_port->has_led) {
2354		/* Turn off LED */
2355		mos7840_set_led_sync(port, MODEM_CONTROL_REGISTER, 0x0300);
2356
2357		del_timer_sync(&mos7840_port->led_timer1);
2358		del_timer_sync(&mos7840_port->led_timer2);
2359
2360		usb_kill_urb(mos7840_port->led_urb);
2361		usb_free_urb(mos7840_port->led_urb);
2362		kfree(mos7840_port->led_dr);
2363	}
2364	usb_kill_urb(mos7840_port->control_urb);
2365	usb_free_urb(mos7840_port->control_urb);
2366	kfree(mos7840_port->ctrl_buf);
2367	kfree(mos7840_port->dr);
2368	kfree(mos7840_port);
2369
2370	return 0;
2371}
2372
2373static struct usb_serial_driver moschip7840_4port_device = {
2374	.driver = {
2375		   .owner = THIS_MODULE,
2376		   .name = "mos7840",
2377		   },
2378	.description = DRIVER_DESC,
2379	.id_table = id_table,
2380	.num_ports = 4,
2381	.open = mos7840_open,
2382	.close = mos7840_close,
2383	.write = mos7840_write,
2384	.write_room = mos7840_write_room,
2385	.chars_in_buffer = mos7840_chars_in_buffer,
2386	.throttle = mos7840_throttle,
2387	.unthrottle = mos7840_unthrottle,
2388	.calc_num_ports = mos7840_calc_num_ports,
2389	.probe = mos7840_probe,
2390	.ioctl = mos7840_ioctl,
2391	.set_termios = mos7840_set_termios,
2392	.break_ctl = mos7840_break,
2393	.tiocmget = mos7840_tiocmget,
2394	.tiocmset = mos7840_tiocmset,
2395	.tiocmiwait = usb_serial_generic_tiocmiwait,
2396	.get_icount = usb_serial_generic_get_icount,
2397	.port_probe = mos7840_port_probe,
2398	.port_remove = mos7840_port_remove,
2399	.read_bulk_callback = mos7840_bulk_in_callback,
2400	.read_int_callback = mos7840_interrupt_callback,
2401};
2402
2403static struct usb_serial_driver * const serial_drivers[] = {
2404	&moschip7840_4port_device, NULL
2405};
2406
2407module_usb_serial_driver(serial_drivers, id_table);
2408
2409MODULE_DESCRIPTION(DRIVER_DESC);
2410MODULE_LICENSE("GPL");
2411