tjh.dev
Linux kernel mirror (for testing)
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linux
1// SPDX-License-Identifier: GPL-2.0+
2/*
3 * Clean ups from Moschip version and a few ioctl implementations by:
4 * Paul B Schroeder <pschroeder "at" uplogix "dot" com>
5 *
6 * Originally based on drivers/usb/serial/io_edgeport.c which is:
7 * Copyright (C) 2000 Inside Out Networks, All rights reserved.
8 * Copyright (C) 2001-2002 Greg Kroah-Hartman <greg@kroah.com>
9 *
10 */
11
12#include <linux/kernel.h>
13#include <linux/errno.h>
14#include <linux/slab.h>
15#include <linux/tty.h>
16#include <linux/tty_driver.h>
17#include <linux/tty_flip.h>
18#include <linux/module.h>
19#include <linux/serial.h>
20#include <linux/usb.h>
21#include <linux/usb/serial.h>
22#include <linux/uaccess.h>
23
24#define DRIVER_DESC "Moschip 7840/7820 USB Serial Driver"
25
26/*
27 * 16C50 UART register defines
28 */
29
30#define LCR_BITS_5 0x00 /* 5 bits/char */
31#define LCR_BITS_6 0x01 /* 6 bits/char */
32#define LCR_BITS_7 0x02 /* 7 bits/char */
33#define LCR_BITS_8 0x03 /* 8 bits/char */
34#define LCR_BITS_MASK 0x03 /* Mask for bits/char field */
35
36#define LCR_STOP_1 0x00 /* 1 stop bit */
37#define LCR_STOP_1_5 0x04 /* 1.5 stop bits (if 5 bits/char) */
38#define LCR_STOP_2 0x04 /* 2 stop bits (if 6-8 bits/char) */
39#define LCR_STOP_MASK 0x04 /* Mask for stop bits field */
40
41#define LCR_PAR_NONE 0x00 /* No parity */
42#define LCR_PAR_ODD 0x08 /* Odd parity */
43#define LCR_PAR_EVEN 0x18 /* Even parity */
44#define LCR_PAR_MARK 0x28 /* Force parity bit to 1 */
45#define LCR_PAR_SPACE 0x38 /* Force parity bit to 0 */
46#define LCR_PAR_MASK 0x38 /* Mask for parity field */
47
48#define LCR_SET_BREAK 0x40 /* Set Break condition */
49#define LCR_DL_ENABLE 0x80 /* Enable access to divisor latch */
50
51#define MCR_DTR 0x01 /* Assert DTR */
52#define MCR_RTS 0x02 /* Assert RTS */
53#define MCR_OUT1 0x04 /* Loopback only: Sets state of RI */
54#define MCR_MASTER_IE 0x08 /* Enable interrupt outputs */
55#define MCR_LOOPBACK 0x10 /* Set internal (digital) loopback mode */
56#define MCR_XON_ANY 0x20 /* Enable any char to exit XOFF mode */
57
58#define MOS7840_MSR_CTS 0x10 /* Current state of CTS */
59#define MOS7840_MSR_DSR 0x20 /* Current state of DSR */
60#define MOS7840_MSR_RI 0x40 /* Current state of RI */
61#define MOS7840_MSR_CD 0x80 /* Current state of CD */
62
63/*
64 * Defines used for sending commands to port
65 */
66
67#define MOS_WDR_TIMEOUT 5000 /* default urb timeout */
68
69#define MOS_PORT1 0x0200
70#define MOS_PORT2 0x0300
71#define MOS_VENREG 0x0000
72#define MOS_MAX_PORT 0x02
73#define MOS_WRITE 0x0E
74#define MOS_READ 0x0D
75
76/* Requests */
77#define MCS_RD_RTYPE 0xC0
78#define MCS_WR_RTYPE 0x40
79#define MCS_RDREQ 0x0D
80#define MCS_WRREQ 0x0E
81#define MCS_CTRL_TIMEOUT 500
82#define VENDOR_READ_LENGTH (0x01)
83
84#define MAX_NAME_LEN 64
85
86#define ZLP_REG1 0x3A /* Zero_Flag_Reg1 58 */
87#define ZLP_REG5 0x3E /* Zero_Flag_Reg5 62 */
88
89/* For higher baud Rates use TIOCEXBAUD */
90#define TIOCEXBAUD 0x5462
91
92/*
93 * Vendor id and device id defines
94 *
95 * NOTE: Do not add new defines, add entries directly to the id_table instead.
96 */
97#define USB_VENDOR_ID_BANDB 0x0856
98#define BANDB_DEVICE_ID_USO9ML2_2 0xAC22
99#define BANDB_DEVICE_ID_USO9ML2_2P 0xBC00
100#define BANDB_DEVICE_ID_USO9ML2_4 0xAC24
101#define BANDB_DEVICE_ID_USO9ML2_4P 0xBC01
102#define BANDB_DEVICE_ID_US9ML2_2 0xAC29
103#define BANDB_DEVICE_ID_US9ML2_4 0xAC30
104#define BANDB_DEVICE_ID_USPTL4_2 0xAC31
105#define BANDB_DEVICE_ID_USPTL4_4 0xAC32
106#define BANDB_DEVICE_ID_USOPTL4_2 0xAC42
107#define BANDB_DEVICE_ID_USOPTL4_2P 0xBC02
108#define BANDB_DEVICE_ID_USOPTL4_4 0xAC44
109#define BANDB_DEVICE_ID_USOPTL4_4P 0xBC03
110#define BANDB_DEVICE_ID_USOPTL2_4 0xAC24
111
112/* Interrupt Routine Defines */
113
114#define SERIAL_IIR_RLS 0x06
115#define SERIAL_IIR_MS 0x00
116
117/*
118 * Emulation of the bit mask on the LINE STATUS REGISTER.
119 */
120#define SERIAL_LSR_DR 0x0001
121#define SERIAL_LSR_OE 0x0002
122#define SERIAL_LSR_PE 0x0004
123#define SERIAL_LSR_FE 0x0008
124#define SERIAL_LSR_BI 0x0010
125
126#define MOS_MSR_DELTA_CTS 0x10
127#define MOS_MSR_DELTA_DSR 0x20
128#define MOS_MSR_DELTA_RI 0x40
129#define MOS_MSR_DELTA_CD 0x80
130
131/* Serial Port register Address */
132#define INTERRUPT_ENABLE_REGISTER ((__u16)(0x01))
133#define FIFO_CONTROL_REGISTER ((__u16)(0x02))
134#define LINE_CONTROL_REGISTER ((__u16)(0x03))
135#define MODEM_CONTROL_REGISTER ((__u16)(0x04))
136#define LINE_STATUS_REGISTER ((__u16)(0x05))
137#define MODEM_STATUS_REGISTER ((__u16)(0x06))
138#define SCRATCH_PAD_REGISTER ((__u16)(0x07))
139#define DIVISOR_LATCH_LSB ((__u16)(0x00))
140#define DIVISOR_LATCH_MSB ((__u16)(0x01))
141
142#define CLK_MULTI_REGISTER ((__u16)(0x02))
143#define CLK_START_VALUE_REGISTER ((__u16)(0x03))
144#define GPIO_REGISTER ((__u16)(0x07))
145
146#define SERIAL_LCR_DLAB ((__u16)(0x0080))
147
148/*
149 * URB POOL related defines
150 */
151#define NUM_URBS 16 /* URB Count */
152#define URB_TRANSFER_BUFFER_SIZE 32 /* URB Size */
153
154/* LED on/off milliseconds*/
155#define LED_ON_MS 500
156#define LED_OFF_MS 500
157
158enum mos7840_flag {
159 MOS7840_FLAG_LED_BUSY,
160};
161
162#define MCS_PORT_MASK GENMASK(2, 0)
163#define MCS_PORTS(nr) ((nr) & MCS_PORT_MASK)
164#define MCS_LED BIT(3)
165
166#define MCS_DEVICE(vid, pid, flags) \
167 USB_DEVICE((vid), (pid)), .driver_info = (flags)
168
169static const struct usb_device_id id_table[] = {
170 { MCS_DEVICE(0x0557, 0x2011, MCS_PORTS(4)) }, /* ATEN UC2324 */
171 { MCS_DEVICE(0x0557, 0x7820, MCS_PORTS(2)) }, /* ATEN UC2322 */
172 { MCS_DEVICE(0x110a, 0x2210, MCS_PORTS(2)) }, /* Moxa UPort 2210 */
173 { MCS_DEVICE(0x9710, 0x7810, MCS_PORTS(1) | MCS_LED) }, /* ASIX MCS7810 */
174 { MCS_DEVICE(0x9710, 0x7820, MCS_PORTS(2)) }, /* MosChip MCS7820 */
175 { MCS_DEVICE(0x9710, 0x7840, MCS_PORTS(4)) }, /* MosChip MCS7840 */
176 { MCS_DEVICE(0x9710, 0x7843, MCS_PORTS(3)) }, /* ASIX MCS7840 3 port */
177 { USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USO9ML2_2) },
178 { USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USO9ML2_2P) },
179 { USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USO9ML2_4) },
180 { USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USO9ML2_4P) },
181 { USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_US9ML2_2) },
182 { USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_US9ML2_4) },
183 { USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USPTL4_2) },
184 { USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USPTL4_4) },
185 { USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USOPTL4_2) },
186 { USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USOPTL4_2P) },
187 { USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USOPTL4_4) },
188 { USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USOPTL4_4P) },
189 { USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USOPTL2_4) },
190 {} /* terminating entry */
191};
192MODULE_DEVICE_TABLE(usb, id_table);
193
194/* This structure holds all of the local port information */
195
196struct moschip_port {
197 int port_num; /*Actual port number in the device(1,2,etc) */
198 struct urb *read_urb; /* read URB for this port */
199 __u8 shadowLCR; /* last LCR value received */
200 __u8 shadowMCR; /* last MCR value received */
201 struct usb_serial_port *port; /* loop back to the owner of this object */
202
203 /* Offsets */
204 __u8 SpRegOffset;
205 __u8 ControlRegOffset;
206 __u8 DcrRegOffset;
207
208 spinlock_t pool_lock;
209 struct urb *write_urb_pool[NUM_URBS];
210 char busy[NUM_URBS];
211 bool read_urb_busy;
212
213 /* For device(s) with LED indicator */
214 bool has_led;
215 struct timer_list led_timer1; /* Timer for LED on */
216 struct timer_list led_timer2; /* Timer for LED off */
217 struct urb *led_urb;
218 struct usb_ctrlrequest *led_dr;
219
220 unsigned long flags;
221};
222
223/*
224 * mos7840_set_reg_sync
225 * To set the Control register by calling usb_fill_control_urb function
226 * by passing usb_sndctrlpipe function as parameter.
227 */
228
229static int mos7840_set_reg_sync(struct usb_serial_port *port, __u16 reg,
230 __u16 val)
231{
232 struct usb_device *dev = port->serial->dev;
233 val = val & 0x00ff;
234 dev_dbg(&port->dev, "mos7840_set_reg_sync offset is %x, value %x\n", reg, val);
235
236 return usb_control_msg(dev, usb_sndctrlpipe(dev, 0), MCS_WRREQ,
237 MCS_WR_RTYPE, val, reg, NULL, 0,
238 MOS_WDR_TIMEOUT);
239}
240
241/*
242 * mos7840_get_reg_sync
243 * To set the Uart register by calling usb_fill_control_urb function by
244 * passing usb_rcvctrlpipe function as parameter.
245 */
246
247static int mos7840_get_reg_sync(struct usb_serial_port *port, __u16 reg,
248 __u16 *val)
249{
250 struct usb_device *dev = port->serial->dev;
251 int ret = 0;
252 u8 *buf;
253
254 buf = kmalloc(VENDOR_READ_LENGTH, GFP_KERNEL);
255 if (!buf)
256 return -ENOMEM;
257
258 ret = usb_control_msg(dev, usb_rcvctrlpipe(dev, 0), MCS_RDREQ,
259 MCS_RD_RTYPE, 0, reg, buf, VENDOR_READ_LENGTH,
260 MOS_WDR_TIMEOUT);
261 if (ret < VENDOR_READ_LENGTH) {
262 if (ret >= 0)
263 ret = -EIO;
264 goto out;
265 }
266
267 *val = buf[0];
268 dev_dbg(&port->dev, "%s offset is %x, return val %x\n", __func__, reg, *val);
269out:
270 kfree(buf);
271 return ret;
272}
273
274/*
275 * mos7840_set_uart_reg
276 * To set the Uart register by calling usb_fill_control_urb function by
277 * passing usb_sndctrlpipe function as parameter.
278 */
279
280static int mos7840_set_uart_reg(struct usb_serial_port *port, __u16 reg,
281 __u16 val)
282{
283
284 struct usb_device *dev = port->serial->dev;
285 val = val & 0x00ff;
286 /* For the UART control registers, the application number need
287 to be Or'ed */
288 if (port->serial->num_ports == 2 && port->port_number != 0)
289 val |= ((__u16)port->port_number + 2) << 8;
290 else
291 val |= ((__u16)port->port_number + 1) << 8;
292 dev_dbg(&port->dev, "%s application number is %x\n", __func__, val);
293 return usb_control_msg(dev, usb_sndctrlpipe(dev, 0), MCS_WRREQ,
294 MCS_WR_RTYPE, val, reg, NULL, 0,
295 MOS_WDR_TIMEOUT);
296
297}
298
299/*
300 * mos7840_get_uart_reg
301 * To set the Control register by calling usb_fill_control_urb function
302 * by passing usb_rcvctrlpipe function as parameter.
303 */
304static int mos7840_get_uart_reg(struct usb_serial_port *port, __u16 reg,
305 __u16 *val)
306{
307 struct usb_device *dev = port->serial->dev;
308 int ret = 0;
309 __u16 Wval;
310 u8 *buf;
311
312 buf = kmalloc(VENDOR_READ_LENGTH, GFP_KERNEL);
313 if (!buf)
314 return -ENOMEM;
315
316 /* Wval is same as application number */
317 if (port->serial->num_ports == 2 && port->port_number != 0)
318 Wval = ((__u16)port->port_number + 2) << 8;
319 else
320 Wval = ((__u16)port->port_number + 1) << 8;
321 dev_dbg(&port->dev, "%s application number is %x\n", __func__, Wval);
322 ret = usb_control_msg(dev, usb_rcvctrlpipe(dev, 0), MCS_RDREQ,
323 MCS_RD_RTYPE, Wval, reg, buf, VENDOR_READ_LENGTH,
324 MOS_WDR_TIMEOUT);
325 if (ret < VENDOR_READ_LENGTH) {
326 if (ret >= 0)
327 ret = -EIO;
328 goto out;
329 }
330 *val = buf[0];
331out:
332 kfree(buf);
333 return ret;
334}
335
336static void mos7840_dump_serial_port(struct usb_serial_port *port,
337 struct moschip_port *mos7840_port)
338{
339
340 dev_dbg(&port->dev, "SpRegOffset is %2x\n", mos7840_port->SpRegOffset);
341 dev_dbg(&port->dev, "ControlRegOffset is %2x\n", mos7840_port->ControlRegOffset);
342 dev_dbg(&port->dev, "DCRRegOffset is %2x\n", mos7840_port->DcrRegOffset);
343
344}
345
346/************************************************************************/
347/************************************************************************/
348/* U S B C A L L B A C K F U N C T I O N S */
349/* U S B C A L L B A C K F U N C T I O N S */
350/************************************************************************/
351/************************************************************************/
352
353static void mos7840_set_led_callback(struct urb *urb)
354{
355 switch (urb->status) {
356 case 0:
357 /* Success */
358 break;
359 case -ECONNRESET:
360 case -ENOENT:
361 case -ESHUTDOWN:
362 /* This urb is terminated, clean up */
363 dev_dbg(&urb->dev->dev, "%s - urb shutting down: %d\n",
364 __func__, urb->status);
365 break;
366 default:
367 dev_dbg(&urb->dev->dev, "%s - nonzero urb status: %d\n",
368 __func__, urb->status);
369 }
370}
371
372static void mos7840_set_led_async(struct moschip_port *mcs, __u16 wval,
373 __u16 reg)
374{
375 struct usb_device *dev = mcs->port->serial->dev;
376 struct usb_ctrlrequest *dr = mcs->led_dr;
377
378 dr->bRequestType = MCS_WR_RTYPE;
379 dr->bRequest = MCS_WRREQ;
380 dr->wValue = cpu_to_le16(wval);
381 dr->wIndex = cpu_to_le16(reg);
382 dr->wLength = cpu_to_le16(0);
383
384 usb_fill_control_urb(mcs->led_urb, dev, usb_sndctrlpipe(dev, 0),
385 (unsigned char *)dr, NULL, 0, mos7840_set_led_callback, NULL);
386
387 usb_submit_urb(mcs->led_urb, GFP_ATOMIC);
388}
389
390static void mos7840_set_led_sync(struct usb_serial_port *port, __u16 reg,
391 __u16 val)
392{
393 struct usb_device *dev = port->serial->dev;
394
395 usb_control_msg(dev, usb_sndctrlpipe(dev, 0), MCS_WRREQ, MCS_WR_RTYPE,
396 val, reg, NULL, 0, MOS_WDR_TIMEOUT);
397}
398
399static void mos7840_led_off(struct timer_list *t)
400{
401 struct moschip_port *mcs = from_timer(mcs, t, led_timer1);
402
403 /* Turn off LED */
404 mos7840_set_led_async(mcs, 0x0300, MODEM_CONTROL_REGISTER);
405 mod_timer(&mcs->led_timer2,
406 jiffies + msecs_to_jiffies(LED_OFF_MS));
407}
408
409static void mos7840_led_flag_off(struct timer_list *t)
410{
411 struct moschip_port *mcs = from_timer(mcs, t, led_timer2);
412
413 clear_bit_unlock(MOS7840_FLAG_LED_BUSY, &mcs->flags);
414}
415
416static void mos7840_led_activity(struct usb_serial_port *port)
417{
418 struct moschip_port *mos7840_port = usb_get_serial_port_data(port);
419
420 if (test_and_set_bit_lock(MOS7840_FLAG_LED_BUSY, &mos7840_port->flags))
421 return;
422
423 mos7840_set_led_async(mos7840_port, 0x0301, MODEM_CONTROL_REGISTER);
424 mod_timer(&mos7840_port->led_timer1,
425 jiffies + msecs_to_jiffies(LED_ON_MS));
426}
427
428/*****************************************************************************
429 * mos7840_bulk_in_callback
430 * this is the callback function for when we have received data on the
431 * bulk in endpoint.
432 *****************************************************************************/
433
434static void mos7840_bulk_in_callback(struct urb *urb)
435{
436 struct moschip_port *mos7840_port = urb->context;
437 struct usb_serial_port *port = mos7840_port->port;
438 int retval;
439 unsigned char *data;
440 int status = urb->status;
441
442 if (status) {
443 dev_dbg(&urb->dev->dev, "nonzero read bulk status received: %d\n", status);
444 mos7840_port->read_urb_busy = false;
445 return;
446 }
447
448 data = urb->transfer_buffer;
449 usb_serial_debug_data(&port->dev, __func__, urb->actual_length, data);
450
451 if (urb->actual_length) {
452 struct tty_port *tport = &mos7840_port->port->port;
453 tty_insert_flip_string(tport, data, urb->actual_length);
454 tty_flip_buffer_push(tport);
455 port->icount.rx += urb->actual_length;
456 dev_dbg(&port->dev, "icount.rx is %d:\n", port->icount.rx);
457 }
458
459 if (mos7840_port->has_led)
460 mos7840_led_activity(port);
461
462 mos7840_port->read_urb_busy = true;
463 retval = usb_submit_urb(mos7840_port->read_urb, GFP_ATOMIC);
464
465 if (retval) {
466 dev_dbg(&port->dev, "usb_submit_urb(read bulk) failed, retval = %d\n", retval);
467 mos7840_port->read_urb_busy = false;
468 }
469}
470
471/*****************************************************************************
472 * mos7840_bulk_out_data_callback
473 * this is the callback function for when we have finished sending
474 * serial data on the bulk out endpoint.
475 *****************************************************************************/
476
477static void mos7840_bulk_out_data_callback(struct urb *urb)
478{
479 struct moschip_port *mos7840_port = urb->context;
480 struct usb_serial_port *port = mos7840_port->port;
481 int status = urb->status;
482 unsigned long flags;
483 int i;
484
485 spin_lock_irqsave(&mos7840_port->pool_lock, flags);
486 for (i = 0; i < NUM_URBS; i++) {
487 if (urb == mos7840_port->write_urb_pool[i]) {
488 mos7840_port->busy[i] = 0;
489 break;
490 }
491 }
492 spin_unlock_irqrestore(&mos7840_port->pool_lock, flags);
493
494 if (status) {
495 dev_dbg(&port->dev, "nonzero write bulk status received:%d\n", status);
496 return;
497 }
498
499 tty_port_tty_wakeup(&port->port);
500
501}
502
503/************************************************************************/
504/* 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 */
505/************************************************************************/
506
507/*****************************************************************************
508 * mos7840_open
509 * this function is called by the tty driver when a port is opened
510 * If successful, we return 0
511 * Otherwise we return a negative error number.
512 *****************************************************************************/
513
514static int mos7840_open(struct tty_struct *tty, struct usb_serial_port *port)
515{
516 struct moschip_port *mos7840_port = usb_get_serial_port_data(port);
517 struct usb_serial *serial = port->serial;
518 int response;
519 int j;
520 struct urb *urb;
521 __u16 Data;
522 int status;
523
524 usb_clear_halt(serial->dev, port->write_urb->pipe);
525 usb_clear_halt(serial->dev, port->read_urb->pipe);
526
527 /* Initialising the write urb pool */
528 for (j = 0; j < NUM_URBS; ++j) {
529 urb = usb_alloc_urb(0, GFP_KERNEL);
530 mos7840_port->write_urb_pool[j] = urb;
531 if (!urb)
532 continue;
533
534 urb->transfer_buffer = kmalloc(URB_TRANSFER_BUFFER_SIZE,
535 GFP_KERNEL);
536 if (!urb->transfer_buffer) {
537 usb_free_urb(urb);
538 mos7840_port->write_urb_pool[j] = NULL;
539 continue;
540 }
541 }
542
543/*****************************************************************************
544 * Initialize MCS7840 -- Write Init values to corresponding Registers
545 *
546 * Register Index
547 * 1 : IER
548 * 2 : FCR
549 * 3 : LCR
550 * 4 : MCR
551 *
552 * 0x08 : SP1/2 Control Reg
553 *****************************************************************************/
554
555 /* NEED to check the following Block */
556
557 Data = 0x0;
558 status = mos7840_get_reg_sync(port, mos7840_port->SpRegOffset, &Data);
559 if (status < 0) {
560 dev_dbg(&port->dev, "Reading Spreg failed\n");
561 goto err;
562 }
563 Data |= 0x80;
564 status = mos7840_set_reg_sync(port, mos7840_port->SpRegOffset, Data);
565 if (status < 0) {
566 dev_dbg(&port->dev, "writing Spreg failed\n");
567 goto err;
568 }
569
570 Data &= ~0x80;
571 status = mos7840_set_reg_sync(port, mos7840_port->SpRegOffset, Data);
572 if (status < 0) {
573 dev_dbg(&port->dev, "writing Spreg failed\n");
574 goto err;
575 }
576 /* End of block to be checked */
577
578 Data = 0x0;
579 status = mos7840_get_reg_sync(port, mos7840_port->ControlRegOffset,
580 &Data);
581 if (status < 0) {
582 dev_dbg(&port->dev, "Reading Controlreg failed\n");
583 goto err;
584 }
585 Data |= 0x08; /* Driver done bit */
586 Data |= 0x20; /* rx_disable */
587 status = mos7840_set_reg_sync(port,
588 mos7840_port->ControlRegOffset, Data);
589 if (status < 0) {
590 dev_dbg(&port->dev, "writing Controlreg failed\n");
591 goto err;
592 }
593 /* do register settings here */
594 /* Set all regs to the device default values. */
595 /***********************************
596 * First Disable all interrupts.
597 ***********************************/
598 Data = 0x00;
599 status = mos7840_set_uart_reg(port, INTERRUPT_ENABLE_REGISTER, Data);
600 if (status < 0) {
601 dev_dbg(&port->dev, "disabling interrupts failed\n");
602 goto err;
603 }
604 /* Set FIFO_CONTROL_REGISTER to the default value */
605 Data = 0x00;
606 status = mos7840_set_uart_reg(port, FIFO_CONTROL_REGISTER, Data);
607 if (status < 0) {
608 dev_dbg(&port->dev, "Writing FIFO_CONTROL_REGISTER failed\n");
609 goto err;
610 }
611
612 Data = 0xcf;
613 status = mos7840_set_uart_reg(port, FIFO_CONTROL_REGISTER, Data);
614 if (status < 0) {
615 dev_dbg(&port->dev, "Writing FIFO_CONTROL_REGISTER failed\n");
616 goto err;
617 }
618
619 Data = 0x03;
620 status = mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data);
621 mos7840_port->shadowLCR = Data;
622
623 Data = 0x0b;
624 status = mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER, Data);
625 mos7840_port->shadowMCR = Data;
626
627 Data = 0x00;
628 status = mos7840_get_uart_reg(port, LINE_CONTROL_REGISTER, &Data);
629 mos7840_port->shadowLCR = Data;
630
631 Data |= SERIAL_LCR_DLAB; /* data latch enable in LCR 0x80 */
632 status = mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data);
633
634 Data = 0x0c;
635 status = mos7840_set_uart_reg(port, DIVISOR_LATCH_LSB, Data);
636
637 Data = 0x0;
638 status = mos7840_set_uart_reg(port, DIVISOR_LATCH_MSB, Data);
639
640 Data = 0x00;
641 status = mos7840_get_uart_reg(port, LINE_CONTROL_REGISTER, &Data);
642
643 Data = Data & ~SERIAL_LCR_DLAB;
644 status = mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data);
645 mos7840_port->shadowLCR = Data;
646
647 /* clearing Bulkin and Bulkout Fifo */
648 Data = 0x0;
649 status = mos7840_get_reg_sync(port, mos7840_port->SpRegOffset, &Data);
650
651 Data = Data | 0x0c;
652 status = mos7840_set_reg_sync(port, mos7840_port->SpRegOffset, Data);
653
654 Data = Data & ~0x0c;
655 status = mos7840_set_reg_sync(port, mos7840_port->SpRegOffset, Data);
656 /* Finally enable all interrupts */
657 Data = 0x0c;
658 status = mos7840_set_uart_reg(port, INTERRUPT_ENABLE_REGISTER, Data);
659
660 /* clearing rx_disable */
661 Data = 0x0;
662 status = mos7840_get_reg_sync(port, mos7840_port->ControlRegOffset,
663 &Data);
664 Data = Data & ~0x20;
665 status = mos7840_set_reg_sync(port, mos7840_port->ControlRegOffset,
666 Data);
667
668 /* rx_negate */
669 Data = 0x0;
670 status = mos7840_get_reg_sync(port, mos7840_port->ControlRegOffset,
671 &Data);
672 Data = Data | 0x10;
673 status = mos7840_set_reg_sync(port, mos7840_port->ControlRegOffset,
674 Data);
675
676 dev_dbg(&port->dev, "port number is %d\n", port->port_number);
677 dev_dbg(&port->dev, "minor number is %d\n", port->minor);
678 dev_dbg(&port->dev, "Bulkin endpoint is %d\n", port->bulk_in_endpointAddress);
679 dev_dbg(&port->dev, "BulkOut endpoint is %d\n", port->bulk_out_endpointAddress);
680 dev_dbg(&port->dev, "Interrupt endpoint is %d\n", port->interrupt_in_endpointAddress);
681 dev_dbg(&port->dev, "port's number in the device is %d\n", mos7840_port->port_num);
682 mos7840_port->read_urb = port->read_urb;
683
684 /* set up our bulk in urb */
685 if ((serial->num_ports == 2) && (((__u16)port->port_number % 2) != 0)) {
686 usb_fill_bulk_urb(mos7840_port->read_urb,
687 serial->dev,
688 usb_rcvbulkpipe(serial->dev,
689 (port->bulk_in_endpointAddress) + 2),
690 port->bulk_in_buffer,
691 mos7840_port->read_urb->transfer_buffer_length,
692 mos7840_bulk_in_callback, mos7840_port);
693 } else {
694 usb_fill_bulk_urb(mos7840_port->read_urb,
695 serial->dev,
696 usb_rcvbulkpipe(serial->dev,
697 port->bulk_in_endpointAddress),
698 port->bulk_in_buffer,
699 mos7840_port->read_urb->transfer_buffer_length,
700 mos7840_bulk_in_callback, mos7840_port);
701 }
702
703 dev_dbg(&port->dev, "%s: bulkin endpoint is %d\n", __func__, port->bulk_in_endpointAddress);
704 mos7840_port->read_urb_busy = true;
705 response = usb_submit_urb(mos7840_port->read_urb, GFP_KERNEL);
706 if (response) {
707 dev_err(&port->dev, "%s - Error %d submitting control urb\n",
708 __func__, response);
709 mos7840_port->read_urb_busy = false;
710 }
711
712 /* initialize our port settings */
713 /* Must set to enable ints! */
714 mos7840_port->shadowMCR = MCR_MASTER_IE;
715
716 return 0;
717err:
718 for (j = 0; j < NUM_URBS; ++j) {
719 urb = mos7840_port->write_urb_pool[j];
720 if (!urb)
721 continue;
722 kfree(urb->transfer_buffer);
723 usb_free_urb(urb);
724 }
725 return status;
726}
727
728/*****************************************************************************
729 * mos7840_chars_in_buffer
730 * this function is called by the tty driver when it wants to know how many
731 * bytes of data we currently have outstanding in the port (data that has
732 * been written, but hasn't made it out the port yet)
733 * If successful, we return the number of bytes left to be written in the
734 * system,
735 * Otherwise we return zero.
736 *****************************************************************************/
737
738static int mos7840_chars_in_buffer(struct tty_struct *tty)
739{
740 struct usb_serial_port *port = tty->driver_data;
741 struct moschip_port *mos7840_port = usb_get_serial_port_data(port);
742 int i;
743 int chars = 0;
744 unsigned long flags;
745
746 spin_lock_irqsave(&mos7840_port->pool_lock, flags);
747 for (i = 0; i < NUM_URBS; ++i) {
748 if (mos7840_port->busy[i]) {
749 struct urb *urb = mos7840_port->write_urb_pool[i];
750 chars += urb->transfer_buffer_length;
751 }
752 }
753 spin_unlock_irqrestore(&mos7840_port->pool_lock, flags);
754 dev_dbg(&port->dev, "%s - returns %d\n", __func__, chars);
755 return chars;
756
757}
758
759/*****************************************************************************
760 * mos7840_close
761 * this function is called by the tty driver when a port is closed
762 *****************************************************************************/
763
764static void mos7840_close(struct usb_serial_port *port)
765{
766 struct moschip_port *mos7840_port = usb_get_serial_port_data(port);
767 int j;
768 __u16 Data;
769
770 for (j = 0; j < NUM_URBS; ++j)
771 usb_kill_urb(mos7840_port->write_urb_pool[j]);
772
773 /* Freeing Write URBs */
774 for (j = 0; j < NUM_URBS; ++j) {
775 if (mos7840_port->write_urb_pool[j]) {
776 kfree(mos7840_port->write_urb_pool[j]->transfer_buffer);
777 usb_free_urb(mos7840_port->write_urb_pool[j]);
778 }
779 }
780
781 usb_kill_urb(mos7840_port->read_urb);
782 mos7840_port->read_urb_busy = false;
783
784 Data = 0x0;
785 mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER, Data);
786
787 Data = 0x00;
788 mos7840_set_uart_reg(port, INTERRUPT_ENABLE_REGISTER, Data);
789}
790
791/*****************************************************************************
792 * mos7840_break
793 * this function sends a break to the port
794 *****************************************************************************/
795static void mos7840_break(struct tty_struct *tty, int break_state)
796{
797 struct usb_serial_port *port = tty->driver_data;
798 struct moschip_port *mos7840_port = usb_get_serial_port_data(port);
799 unsigned char data;
800
801 if (break_state == -1)
802 data = mos7840_port->shadowLCR | LCR_SET_BREAK;
803 else
804 data = mos7840_port->shadowLCR & ~LCR_SET_BREAK;
805
806 /* FIXME: no locking on shadowLCR anywhere in driver */
807 mos7840_port->shadowLCR = data;
808 dev_dbg(&port->dev, "%s mos7840_port->shadowLCR is %x\n", __func__, mos7840_port->shadowLCR);
809 mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER,
810 mos7840_port->shadowLCR);
811}
812
813/*****************************************************************************
814 * mos7840_write_room
815 * this function is called by the tty driver when it wants to know how many
816 * bytes of data we can accept for a specific port.
817 * If successful, we return the amount of room that we have for this port
818 * Otherwise we return a negative error number.
819 *****************************************************************************/
820
821static int mos7840_write_room(struct tty_struct *tty)
822{
823 struct usb_serial_port *port = tty->driver_data;
824 struct moschip_port *mos7840_port = usb_get_serial_port_data(port);
825 int i;
826 int room = 0;
827 unsigned long flags;
828
829 spin_lock_irqsave(&mos7840_port->pool_lock, flags);
830 for (i = 0; i < NUM_URBS; ++i) {
831 if (!mos7840_port->busy[i])
832 room += URB_TRANSFER_BUFFER_SIZE;
833 }
834 spin_unlock_irqrestore(&mos7840_port->pool_lock, flags);
835
836 room = (room == 0) ? 0 : room - URB_TRANSFER_BUFFER_SIZE + 1;
837 dev_dbg(&mos7840_port->port->dev, "%s - returns %d\n", __func__, room);
838 return room;
839
840}
841
842/*****************************************************************************
843 * mos7840_write
844 * this function is called by the tty driver when data should be written to
845 * the port.
846 * If successful, we return the number of bytes written, otherwise we
847 * return a negative error number.
848 *****************************************************************************/
849
850static int mos7840_write(struct tty_struct *tty, struct usb_serial_port *port,
851 const unsigned char *data, int count)
852{
853 struct moschip_port *mos7840_port = usb_get_serial_port_data(port);
854 struct usb_serial *serial = port->serial;
855 int status;
856 int i;
857 int bytes_sent = 0;
858 int transfer_size;
859 unsigned long flags;
860 struct urb *urb;
861 /* __u16 Data; */
862 const unsigned char *current_position = data;
863
864 /* try to find a free urb in the list */
865 urb = NULL;
866
867 spin_lock_irqsave(&mos7840_port->pool_lock, flags);
868 for (i = 0; i < NUM_URBS; ++i) {
869 if (!mos7840_port->busy[i]) {
870 mos7840_port->busy[i] = 1;
871 urb = mos7840_port->write_urb_pool[i];
872 dev_dbg(&port->dev, "URB:%d\n", i);
873 break;
874 }
875 }
876 spin_unlock_irqrestore(&mos7840_port->pool_lock, flags);
877
878 if (urb == NULL) {
879 dev_dbg(&port->dev, "%s - no more free urbs\n", __func__);
880 goto exit;
881 }
882
883 if (urb->transfer_buffer == NULL) {
884 urb->transfer_buffer = kmalloc(URB_TRANSFER_BUFFER_SIZE,
885 GFP_ATOMIC);
886 if (!urb->transfer_buffer) {
887 bytes_sent = -ENOMEM;
888 goto exit;
889 }
890 }
891 transfer_size = min(count, URB_TRANSFER_BUFFER_SIZE);
892
893 memcpy(urb->transfer_buffer, current_position, transfer_size);
894
895 /* fill urb with data and submit */
896 if ((serial->num_ports == 2) && (((__u16)port->port_number % 2) != 0)) {
897 usb_fill_bulk_urb(urb,
898 serial->dev,
899 usb_sndbulkpipe(serial->dev,
900 (port->bulk_out_endpointAddress) + 2),
901 urb->transfer_buffer,
902 transfer_size,
903 mos7840_bulk_out_data_callback, mos7840_port);
904 } else {
905 usb_fill_bulk_urb(urb,
906 serial->dev,
907 usb_sndbulkpipe(serial->dev,
908 port->bulk_out_endpointAddress),
909 urb->transfer_buffer,
910 transfer_size,
911 mos7840_bulk_out_data_callback, mos7840_port);
912 }
913
914 dev_dbg(&port->dev, "bulkout endpoint is %d\n", port->bulk_out_endpointAddress);
915
916 if (mos7840_port->has_led)
917 mos7840_led_activity(port);
918
919 /* send it down the pipe */
920 status = usb_submit_urb(urb, GFP_ATOMIC);
921
922 if (status) {
923 mos7840_port->busy[i] = 0;
924 dev_err_console(port, "%s - usb_submit_urb(write bulk) failed "
925 "with status = %d\n", __func__, status);
926 bytes_sent = status;
927 goto exit;
928 }
929 bytes_sent = transfer_size;
930 port->icount.tx += transfer_size;
931 dev_dbg(&port->dev, "icount.tx is %d:\n", port->icount.tx);
932exit:
933 return bytes_sent;
934
935}
936
937/*****************************************************************************
938 * mos7840_throttle
939 * this function is called by the tty driver when it wants to stop the data
940 * being read from the port.
941 *****************************************************************************/
942
943static void mos7840_throttle(struct tty_struct *tty)
944{
945 struct usb_serial_port *port = tty->driver_data;
946 struct moschip_port *mos7840_port = usb_get_serial_port_data(port);
947 int status;
948
949 /* if we are implementing XON/XOFF, send the stop character */
950 if (I_IXOFF(tty)) {
951 unsigned char stop_char = STOP_CHAR(tty);
952 status = mos7840_write(tty, port, &stop_char, 1);
953 if (status <= 0)
954 return;
955 }
956 /* if we are implementing RTS/CTS, toggle that line */
957 if (C_CRTSCTS(tty)) {
958 mos7840_port->shadowMCR &= ~MCR_RTS;
959 status = mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER,
960 mos7840_port->shadowMCR);
961 if (status < 0)
962 return;
963 }
964}
965
966/*****************************************************************************
967 * mos7840_unthrottle
968 * this function is called by the tty driver when it wants to resume
969 * the data being read from the port (called after mos7840_throttle is
970 * called)
971 *****************************************************************************/
972static void mos7840_unthrottle(struct tty_struct *tty)
973{
974 struct usb_serial_port *port = tty->driver_data;
975 struct moschip_port *mos7840_port = usb_get_serial_port_data(port);
976 int status;
977
978 /* if we are implementing XON/XOFF, send the start character */
979 if (I_IXOFF(tty)) {
980 unsigned char start_char = START_CHAR(tty);
981 status = mos7840_write(tty, port, &start_char, 1);
982 if (status <= 0)
983 return;
984 }
985
986 /* if we are implementing RTS/CTS, toggle that line */
987 if (C_CRTSCTS(tty)) {
988 mos7840_port->shadowMCR |= MCR_RTS;
989 status = mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER,
990 mos7840_port->shadowMCR);
991 if (status < 0)
992 return;
993 }
994}
995
996static int mos7840_tiocmget(struct tty_struct *tty)
997{
998 struct usb_serial_port *port = tty->driver_data;
999 unsigned int result;
1000 __u16 msr;
1001 __u16 mcr;
1002 int status;
1003
1004 status = mos7840_get_uart_reg(port, MODEM_STATUS_REGISTER, &msr);
1005 if (status < 0)
1006 return -EIO;
1007 status = mos7840_get_uart_reg(port, MODEM_CONTROL_REGISTER, &mcr);
1008 if (status < 0)
1009 return -EIO;
1010 result = ((mcr & MCR_DTR) ? TIOCM_DTR : 0)
1011 | ((mcr & MCR_RTS) ? TIOCM_RTS : 0)
1012 | ((mcr & MCR_LOOPBACK) ? TIOCM_LOOP : 0)
1013 | ((msr & MOS7840_MSR_CTS) ? TIOCM_CTS : 0)
1014 | ((msr & MOS7840_MSR_CD) ? TIOCM_CAR : 0)
1015 | ((msr & MOS7840_MSR_RI) ? TIOCM_RI : 0)
1016 | ((msr & MOS7840_MSR_DSR) ? TIOCM_DSR : 0);
1017
1018 dev_dbg(&port->dev, "%s - 0x%04X\n", __func__, result);
1019
1020 return result;
1021}
1022
1023static int mos7840_tiocmset(struct tty_struct *tty,
1024 unsigned int set, unsigned int clear)
1025{
1026 struct usb_serial_port *port = tty->driver_data;
1027 struct moschip_port *mos7840_port = usb_get_serial_port_data(port);
1028 unsigned int mcr;
1029 int status;
1030
1031 /* FIXME: What locks the port registers ? */
1032 mcr = mos7840_port->shadowMCR;
1033 if (clear & TIOCM_RTS)
1034 mcr &= ~MCR_RTS;
1035 if (clear & TIOCM_DTR)
1036 mcr &= ~MCR_DTR;
1037 if (clear & TIOCM_LOOP)
1038 mcr &= ~MCR_LOOPBACK;
1039
1040 if (set & TIOCM_RTS)
1041 mcr |= MCR_RTS;
1042 if (set & TIOCM_DTR)
1043 mcr |= MCR_DTR;
1044 if (set & TIOCM_LOOP)
1045 mcr |= MCR_LOOPBACK;
1046
1047 mos7840_port->shadowMCR = mcr;
1048
1049 status = mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER, mcr);
1050 if (status < 0) {
1051 dev_dbg(&port->dev, "setting MODEM_CONTROL_REGISTER Failed\n");
1052 return status;
1053 }
1054
1055 return 0;
1056}
1057
1058/*****************************************************************************
1059 * mos7840_calc_baud_rate_divisor
1060 * this function calculates the proper baud rate divisor for the specified
1061 * baud rate.
1062 *****************************************************************************/
1063static int mos7840_calc_baud_rate_divisor(struct usb_serial_port *port,
1064 int baudRate, int *divisor,
1065 __u16 *clk_sel_val)
1066{
1067 dev_dbg(&port->dev, "%s - %d\n", __func__, baudRate);
1068
1069 if (baudRate <= 115200) {
1070 *divisor = 115200 / baudRate;
1071 *clk_sel_val = 0x0;
1072 }
1073 if ((baudRate > 115200) && (baudRate <= 230400)) {
1074 *divisor = 230400 / baudRate;
1075 *clk_sel_val = 0x10;
1076 } else if ((baudRate > 230400) && (baudRate <= 403200)) {
1077 *divisor = 403200 / baudRate;
1078 *clk_sel_val = 0x20;
1079 } else if ((baudRate > 403200) && (baudRate <= 460800)) {
1080 *divisor = 460800 / baudRate;
1081 *clk_sel_val = 0x30;
1082 } else if ((baudRate > 460800) && (baudRate <= 806400)) {
1083 *divisor = 806400 / baudRate;
1084 *clk_sel_val = 0x40;
1085 } else if ((baudRate > 806400) && (baudRate <= 921600)) {
1086 *divisor = 921600 / baudRate;
1087 *clk_sel_val = 0x50;
1088 } else if ((baudRate > 921600) && (baudRate <= 1572864)) {
1089 *divisor = 1572864 / baudRate;
1090 *clk_sel_val = 0x60;
1091 } else if ((baudRate > 1572864) && (baudRate <= 3145728)) {
1092 *divisor = 3145728 / baudRate;
1093 *clk_sel_val = 0x70;
1094 }
1095 return 0;
1096}
1097
1098/*****************************************************************************
1099 * mos7840_send_cmd_write_baud_rate
1100 * this function sends the proper command to change the baud rate of the
1101 * specified port.
1102 *****************************************************************************/
1103
1104static int mos7840_send_cmd_write_baud_rate(struct moschip_port *mos7840_port,
1105 int baudRate)
1106{
1107 struct usb_serial_port *port = mos7840_port->port;
1108 int divisor = 0;
1109 int status;
1110 __u16 Data;
1111 __u16 clk_sel_val;
1112
1113 dev_dbg(&port->dev, "%s - baud = %d\n", __func__, baudRate);
1114 /* reset clk_uart_sel in spregOffset */
1115 if (baudRate > 115200) {
1116#ifdef HW_flow_control
1117 /* NOTE: need to see the pther register to modify */
1118 /* setting h/w flow control bit to 1 */
1119 Data = 0x2b;
1120 mos7840_port->shadowMCR = Data;
1121 status = mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER,
1122 Data);
1123 if (status < 0) {
1124 dev_dbg(&port->dev, "Writing spreg failed in set_serial_baud\n");
1125 return -1;
1126 }
1127#endif
1128
1129 } else {
1130#ifdef HW_flow_control
1131 /* setting h/w flow control bit to 0 */
1132 Data = 0xb;
1133 mos7840_port->shadowMCR = Data;
1134 status = mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER,
1135 Data);
1136 if (status < 0) {
1137 dev_dbg(&port->dev, "Writing spreg failed in set_serial_baud\n");
1138 return -1;
1139 }
1140#endif
1141
1142 }
1143
1144 if (1) { /* baudRate <= 115200) */
1145 clk_sel_val = 0x0;
1146 Data = 0x0;
1147 status = mos7840_calc_baud_rate_divisor(port, baudRate, &divisor,
1148 &clk_sel_val);
1149 status = mos7840_get_reg_sync(port, mos7840_port->SpRegOffset,
1150 &Data);
1151 if (status < 0) {
1152 dev_dbg(&port->dev, "reading spreg failed in set_serial_baud\n");
1153 return -1;
1154 }
1155 Data = (Data & 0x8f) | clk_sel_val;
1156 status = mos7840_set_reg_sync(port, mos7840_port->SpRegOffset,
1157 Data);
1158 if (status < 0) {
1159 dev_dbg(&port->dev, "Writing spreg failed in set_serial_baud\n");
1160 return -1;
1161 }
1162 /* Calculate the Divisor */
1163
1164 if (status) {
1165 dev_err(&port->dev, "%s - bad baud rate\n", __func__);
1166 return status;
1167 }
1168 /* Enable access to divisor latch */
1169 Data = mos7840_port->shadowLCR | SERIAL_LCR_DLAB;
1170 mos7840_port->shadowLCR = Data;
1171 mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data);
1172
1173 /* Write the divisor */
1174 Data = (unsigned char)(divisor & 0xff);
1175 dev_dbg(&port->dev, "set_serial_baud Value to write DLL is %x\n", Data);
1176 mos7840_set_uart_reg(port, DIVISOR_LATCH_LSB, Data);
1177
1178 Data = (unsigned char)((divisor & 0xff00) >> 8);
1179 dev_dbg(&port->dev, "set_serial_baud Value to write DLM is %x\n", Data);
1180 mos7840_set_uart_reg(port, DIVISOR_LATCH_MSB, Data);
1181
1182 /* Disable access to divisor latch */
1183 Data = mos7840_port->shadowLCR & ~SERIAL_LCR_DLAB;
1184 mos7840_port->shadowLCR = Data;
1185 mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data);
1186
1187 }
1188 return status;
1189}
1190
1191/*****************************************************************************
1192 * mos7840_change_port_settings
1193 * This routine is called to set the UART on the device to match
1194 * the specified new settings.
1195 *****************************************************************************/
1196
1197static void mos7840_change_port_settings(struct tty_struct *tty,
1198 struct moschip_port *mos7840_port, struct ktermios *old_termios)
1199{
1200 struct usb_serial_port *port = mos7840_port->port;
1201 int baud;
1202 unsigned cflag;
1203 __u8 lData;
1204 __u8 lParity;
1205 __u8 lStop;
1206 int status;
1207 __u16 Data;
1208
1209 lData = LCR_BITS_8;
1210 lStop = LCR_STOP_1;
1211 lParity = LCR_PAR_NONE;
1212
1213 cflag = tty->termios.c_cflag;
1214
1215 /* Change the number of bits */
1216 switch (cflag & CSIZE) {
1217 case CS5:
1218 lData = LCR_BITS_5;
1219 break;
1220
1221 case CS6:
1222 lData = LCR_BITS_6;
1223 break;
1224
1225 case CS7:
1226 lData = LCR_BITS_7;
1227 break;
1228
1229 default:
1230 case CS8:
1231 lData = LCR_BITS_8;
1232 break;
1233 }
1234
1235 /* Change the Parity bit */
1236 if (cflag & PARENB) {
1237 if (cflag & PARODD) {
1238 lParity = LCR_PAR_ODD;
1239 dev_dbg(&port->dev, "%s - parity = odd\n", __func__);
1240 } else {
1241 lParity = LCR_PAR_EVEN;
1242 dev_dbg(&port->dev, "%s - parity = even\n", __func__);
1243 }
1244
1245 } else {
1246 dev_dbg(&port->dev, "%s - parity = none\n", __func__);
1247 }
1248
1249 if (cflag & CMSPAR)
1250 lParity = lParity | 0x20;
1251
1252 /* Change the Stop bit */
1253 if (cflag & CSTOPB) {
1254 lStop = LCR_STOP_2;
1255 dev_dbg(&port->dev, "%s - stop bits = 2\n", __func__);
1256 } else {
1257 lStop = LCR_STOP_1;
1258 dev_dbg(&port->dev, "%s - stop bits = 1\n", __func__);
1259 }
1260
1261 /* Update the LCR with the correct value */
1262 mos7840_port->shadowLCR &=
1263 ~(LCR_BITS_MASK | LCR_STOP_MASK | LCR_PAR_MASK);
1264 mos7840_port->shadowLCR |= (lData | lParity | lStop);
1265
1266 dev_dbg(&port->dev, "%s - mos7840_port->shadowLCR is %x\n", __func__,
1267 mos7840_port->shadowLCR);
1268 /* Disable Interrupts */
1269 Data = 0x00;
1270 mos7840_set_uart_reg(port, INTERRUPT_ENABLE_REGISTER, Data);
1271
1272 Data = 0x00;
1273 mos7840_set_uart_reg(port, FIFO_CONTROL_REGISTER, Data);
1274
1275 Data = 0xcf;
1276 mos7840_set_uart_reg(port, FIFO_CONTROL_REGISTER, Data);
1277
1278 /* Send the updated LCR value to the mos7840 */
1279 Data = mos7840_port->shadowLCR;
1280
1281 mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data);
1282
1283 Data = 0x00b;
1284 mos7840_port->shadowMCR = Data;
1285 mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER, Data);
1286 Data = 0x00b;
1287 mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER, Data);
1288
1289 /* set up the MCR register and send it to the mos7840 */
1290
1291 mos7840_port->shadowMCR = MCR_MASTER_IE;
1292 if (cflag & CBAUD)
1293 mos7840_port->shadowMCR |= (MCR_DTR | MCR_RTS);
1294
1295 if (cflag & CRTSCTS)
1296 mos7840_port->shadowMCR |= (MCR_XON_ANY);
1297 else
1298 mos7840_port->shadowMCR &= ~(MCR_XON_ANY);
1299
1300 Data = mos7840_port->shadowMCR;
1301 mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER, Data);
1302
1303 /* Determine divisor based on baud rate */
1304 baud = tty_get_baud_rate(tty);
1305
1306 if (!baud) {
1307 /* pick a default, any default... */
1308 dev_dbg(&port->dev, "%s", "Picked default baud...\n");
1309 baud = 9600;
1310 }
1311
1312 dev_dbg(&port->dev, "%s - baud rate = %d\n", __func__, baud);
1313 status = mos7840_send_cmd_write_baud_rate(mos7840_port, baud);
1314
1315 /* Enable Interrupts */
1316 Data = 0x0c;
1317 mos7840_set_uart_reg(port, INTERRUPT_ENABLE_REGISTER, Data);
1318
1319 if (!mos7840_port->read_urb_busy) {
1320 mos7840_port->read_urb_busy = true;
1321 status = usb_submit_urb(mos7840_port->read_urb, GFP_KERNEL);
1322 if (status) {
1323 dev_dbg(&port->dev, "usb_submit_urb(read bulk) failed, status = %d\n",
1324 status);
1325 mos7840_port->read_urb_busy = false;
1326 }
1327 }
1328 dev_dbg(&port->dev, "%s - mos7840_port->shadowLCR is End %x\n", __func__,
1329 mos7840_port->shadowLCR);
1330}
1331
1332/*****************************************************************************
1333 * mos7840_set_termios
1334 * this function is called by the tty driver when it wants to change
1335 * the termios structure
1336 *****************************************************************************/
1337
1338static void mos7840_set_termios(struct tty_struct *tty,
1339 struct usb_serial_port *port,
1340 struct ktermios *old_termios)
1341{
1342 struct moschip_port *mos7840_port = usb_get_serial_port_data(port);
1343 int status;
1344
1345 /* change the port settings to the new ones specified */
1346
1347 mos7840_change_port_settings(tty, mos7840_port, old_termios);
1348
1349 if (!mos7840_port->read_urb_busy) {
1350 mos7840_port->read_urb_busy = true;
1351 status = usb_submit_urb(mos7840_port->read_urb, GFP_KERNEL);
1352 if (status) {
1353 dev_dbg(&port->dev, "usb_submit_urb(read bulk) failed, status = %d\n",
1354 status);
1355 mos7840_port->read_urb_busy = false;
1356 }
1357 }
1358}
1359
1360/*****************************************************************************
1361 * mos7840_get_lsr_info - get line status register info
1362 *
1363 * Purpose: Let user call ioctl() to get info when the UART physically
1364 * is emptied. On bus types like RS485, the transmitter must
1365 * release the bus after transmitting. This must be done when
1366 * the transmit shift register is empty, not be done when the
1367 * transmit holding register is empty. This functionality
1368 * allows an RS485 driver to be written in user space.
1369 *****************************************************************************/
1370
1371static int mos7840_get_lsr_info(struct tty_struct *tty,
1372 unsigned int __user *value)
1373{
1374 int count;
1375 unsigned int result = 0;
1376
1377 count = mos7840_chars_in_buffer(tty);
1378 if (count == 0)
1379 result = TIOCSER_TEMT;
1380
1381 if (copy_to_user(value, &result, sizeof(int)))
1382 return -EFAULT;
1383 return 0;
1384}
1385
1386/*****************************************************************************
1387 * SerialIoctl
1388 * this function handles any ioctl calls to the driver
1389 *****************************************************************************/
1390
1391static int mos7840_ioctl(struct tty_struct *tty,
1392 unsigned int cmd, unsigned long arg)
1393{
1394 struct usb_serial_port *port = tty->driver_data;
1395 void __user *argp = (void __user *)arg;
1396
1397 switch (cmd) {
1398 /* return number of bytes available */
1399
1400 case TIOCSERGETLSR:
1401 dev_dbg(&port->dev, "%s TIOCSERGETLSR\n", __func__);
1402 return mos7840_get_lsr_info(tty, argp);
1403
1404 default:
1405 break;
1406 }
1407 return -ENOIOCTLCMD;
1408}
1409
1410/*
1411 * Check if GPO (pin 42) is connected to GPI (pin 33) as recommended by ASIX
1412 * for MCS7810 by bit-banging a 16-bit word.
1413 *
1414 * Note that GPO is really RTS of the third port so this will toggle RTS of
1415 * port two or three on two- and four-port devices.
1416 */
1417static int mos7810_check(struct usb_serial *serial)
1418{
1419 int i, pass_count = 0;
1420 u8 *buf;
1421 __u16 data = 0, mcr_data = 0;
1422 __u16 test_pattern = 0x55AA;
1423 int res;
1424
1425 buf = kmalloc(VENDOR_READ_LENGTH, GFP_KERNEL);
1426 if (!buf)
1427 return 0; /* failed to identify 7810 */
1428
1429 /* Store MCR setting */
1430 res = usb_control_msg(serial->dev, usb_rcvctrlpipe(serial->dev, 0),
1431 MCS_RDREQ, MCS_RD_RTYPE, 0x0300, MODEM_CONTROL_REGISTER,
1432 buf, VENDOR_READ_LENGTH, MOS_WDR_TIMEOUT);
1433 if (res == VENDOR_READ_LENGTH)
1434 mcr_data = *buf;
1435
1436 for (i = 0; i < 16; i++) {
1437 /* Send the 1-bit test pattern out to MCS7810 test pin */
1438 usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0),
1439 MCS_WRREQ, MCS_WR_RTYPE,
1440 (0x0300 | (((test_pattern >> i) & 0x0001) << 1)),
1441 MODEM_CONTROL_REGISTER, NULL, 0, MOS_WDR_TIMEOUT);
1442
1443 /* Read the test pattern back */
1444 res = usb_control_msg(serial->dev,
1445 usb_rcvctrlpipe(serial->dev, 0), MCS_RDREQ,
1446 MCS_RD_RTYPE, 0, GPIO_REGISTER, buf,
1447 VENDOR_READ_LENGTH, MOS_WDR_TIMEOUT);
1448 if (res == VENDOR_READ_LENGTH)
1449 data = *buf;
1450
1451 /* If this is a MCS7810 device, both test patterns must match */
1452 if (((test_pattern >> i) ^ (~data >> 1)) & 0x0001)
1453 break;
1454
1455 pass_count++;
1456 }
1457
1458 /* Restore MCR setting */
1459 usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0), MCS_WRREQ,
1460 MCS_WR_RTYPE, 0x0300 | mcr_data, MODEM_CONTROL_REGISTER, NULL,
1461 0, MOS_WDR_TIMEOUT);
1462
1463 kfree(buf);
1464
1465 if (pass_count == 16)
1466 return 1;
1467
1468 return 0;
1469}
1470
1471static int mos7840_probe(struct usb_serial *serial,
1472 const struct usb_device_id *id)
1473{
1474 unsigned long device_flags = id->driver_info;
1475 u8 *buf;
1476
1477 /* Skip device-type detection if we already have device flags. */
1478 if (device_flags)
1479 goto out;
1480
1481 buf = kzalloc(VENDOR_READ_LENGTH, GFP_KERNEL);
1482 if (!buf)
1483 return -ENOMEM;
1484
1485 usb_control_msg(serial->dev, usb_rcvctrlpipe(serial->dev, 0),
1486 MCS_RDREQ, MCS_RD_RTYPE, 0, GPIO_REGISTER, buf,
1487 VENDOR_READ_LENGTH, MOS_WDR_TIMEOUT);
1488
1489 /* For a MCS7840 device GPIO0 must be set to 1 */
1490 if (buf[0] & 0x01)
1491 device_flags = MCS_PORTS(4);
1492 else if (mos7810_check(serial))
1493 device_flags = MCS_PORTS(1) | MCS_LED;
1494 else
1495 device_flags = MCS_PORTS(2);
1496
1497 kfree(buf);
1498out:
1499 usb_set_serial_data(serial, (void *)device_flags);
1500
1501 return 0;
1502}
1503
1504static int mos7840_calc_num_ports(struct usb_serial *serial,
1505 struct usb_serial_endpoints *epds)
1506{
1507 unsigned long device_flags = (unsigned long)usb_get_serial_data(serial);
1508 int num_ports = MCS_PORTS(device_flags);
1509
1510 if (num_ports == 0 || num_ports > 4)
1511 return -ENODEV;
1512
1513 if (epds->num_bulk_in < num_ports || epds->num_bulk_out < num_ports) {
1514 dev_err(&serial->interface->dev, "missing endpoints\n");
1515 return -ENODEV;
1516 }
1517
1518 return num_ports;
1519}
1520
1521static int mos7840_attach(struct usb_serial *serial)
1522{
1523 struct device *dev = &serial->interface->dev;
1524 int status;
1525 u16 val;
1526
1527 /* Zero Length flag enable */
1528 val = 0x0f;
1529 status = mos7840_set_reg_sync(serial->port[0], ZLP_REG5, val);
1530 if (status < 0)
1531 dev_dbg(dev, "Writing ZLP_REG5 failed status-0x%x\n", status);
1532 else
1533 dev_dbg(dev, "ZLP_REG5 Writing success status%d\n", status);
1534
1535 return status;
1536}
1537
1538static int mos7840_port_probe(struct usb_serial_port *port)
1539{
1540 struct usb_serial *serial = port->serial;
1541 unsigned long device_flags = (unsigned long)usb_get_serial_data(serial);
1542 struct moschip_port *mos7840_port;
1543 int status;
1544 int pnum;
1545 __u16 Data;
1546
1547 /* we set up the pointers to the endpoints in the mos7840_open *
1548 * function, as the structures aren't created yet. */
1549
1550 pnum = port->port_number;
1551
1552 dev_dbg(&port->dev, "mos7840_startup: configuring port %d\n", pnum);
1553 mos7840_port = kzalloc(sizeof(struct moschip_port), GFP_KERNEL);
1554 if (!mos7840_port)
1555 return -ENOMEM;
1556
1557 /* Initialize all port interrupt end point to port 0 int
1558 * endpoint. Our device has only one interrupt end point
1559 * common to all port */
1560
1561 mos7840_port->port = port;
1562 spin_lock_init(&mos7840_port->pool_lock);
1563
1564 /* minor is not initialised until later by
1565 * usb-serial.c:get_free_serial() and cannot therefore be used
1566 * to index device instances */
1567 mos7840_port->port_num = pnum + 1;
1568 dev_dbg(&port->dev, "port->minor = %d\n", port->minor);
1569 dev_dbg(&port->dev, "mos7840_port->port_num = %d\n", mos7840_port->port_num);
1570
1571 if (mos7840_port->port_num == 1) {
1572 mos7840_port->SpRegOffset = 0x0;
1573 mos7840_port->ControlRegOffset = 0x1;
1574 mos7840_port->DcrRegOffset = 0x4;
1575 } else {
1576 u8 phy_num = mos7840_port->port_num;
1577
1578 /* Port 2 in the 2-port case uses registers of port 3 */
1579 if (serial->num_ports == 2)
1580 phy_num = 3;
1581
1582 mos7840_port->SpRegOffset = 0x8 + 2 * (phy_num - 2);
1583 mos7840_port->ControlRegOffset = 0x9 + 2 * (phy_num - 2);
1584 mos7840_port->DcrRegOffset = 0x16 + 3 * (phy_num - 2);
1585 }
1586 mos7840_dump_serial_port(port, mos7840_port);
1587 usb_set_serial_port_data(port, mos7840_port);
1588
1589 /* enable rx_disable bit in control register */
1590 status = mos7840_get_reg_sync(port,
1591 mos7840_port->ControlRegOffset, &Data);
1592 if (status < 0) {
1593 dev_dbg(&port->dev, "Reading ControlReg failed status-0x%x\n", status);
1594 goto error;
1595 } else
1596 dev_dbg(&port->dev, "ControlReg Reading success val is %x, status%d\n", Data, status);
1597 Data |= 0x08; /* setting driver done bit */
1598 Data |= 0x04; /* sp1_bit to have cts change reflect in
1599 modem status reg */
1600
1601 /* Data |= 0x20; //rx_disable bit */
1602 status = mos7840_set_reg_sync(port,
1603 mos7840_port->ControlRegOffset, Data);
1604 if (status < 0) {
1605 dev_dbg(&port->dev, "Writing ControlReg failed(rx_disable) status-0x%x\n", status);
1606 goto error;
1607 } else
1608 dev_dbg(&port->dev, "ControlReg Writing success(rx_disable) status%d\n", status);
1609
1610 /* Write default values in DCR (i.e 0x01 in DCR0, 0x05 in DCR2
1611 and 0x24 in DCR3 */
1612 Data = 0x01;
1613 status = mos7840_set_reg_sync(port,
1614 (__u16) (mos7840_port->DcrRegOffset + 0), Data);
1615 if (status < 0) {
1616 dev_dbg(&port->dev, "Writing DCR0 failed status-0x%x\n", status);
1617 goto error;
1618 } else
1619 dev_dbg(&port->dev, "DCR0 Writing success status%d\n", status);
1620
1621 Data = 0x05;
1622 status = mos7840_set_reg_sync(port,
1623 (__u16) (mos7840_port->DcrRegOffset + 1), Data);
1624 if (status < 0) {
1625 dev_dbg(&port->dev, "Writing DCR1 failed status-0x%x\n", status);
1626 goto error;
1627 } else
1628 dev_dbg(&port->dev, "DCR1 Writing success status%d\n", status);
1629
1630 Data = 0x24;
1631 status = mos7840_set_reg_sync(port,
1632 (__u16) (mos7840_port->DcrRegOffset + 2), Data);
1633 if (status < 0) {
1634 dev_dbg(&port->dev, "Writing DCR2 failed status-0x%x\n", status);
1635 goto error;
1636 } else
1637 dev_dbg(&port->dev, "DCR2 Writing success status%d\n", status);
1638
1639 /* write values in clkstart0x0 and clkmulti 0x20 */
1640 Data = 0x0;
1641 status = mos7840_set_reg_sync(port, CLK_START_VALUE_REGISTER, Data);
1642 if (status < 0) {
1643 dev_dbg(&port->dev, "Writing CLK_START_VALUE_REGISTER failed status-0x%x\n", status);
1644 goto error;
1645 } else
1646 dev_dbg(&port->dev, "CLK_START_VALUE_REGISTER Writing success status%d\n", status);
1647
1648 Data = 0x20;
1649 status = mos7840_set_reg_sync(port, CLK_MULTI_REGISTER, Data);
1650 if (status < 0) {
1651 dev_dbg(&port->dev, "Writing CLK_MULTI_REGISTER failed status-0x%x\n", status);
1652 goto error;
1653 } else
1654 dev_dbg(&port->dev, "CLK_MULTI_REGISTER Writing success status%d\n", status);
1655
1656 /* write value 0x0 to scratchpad register */
1657 Data = 0x00;
1658 status = mos7840_set_uart_reg(port, SCRATCH_PAD_REGISTER, Data);
1659 if (status < 0) {
1660 dev_dbg(&port->dev, "Writing SCRATCH_PAD_REGISTER failed status-0x%x\n", status);
1661 goto error;
1662 } else
1663 dev_dbg(&port->dev, "SCRATCH_PAD_REGISTER Writing success status%d\n", status);
1664
1665 /* Zero Length flag register */
1666 if ((mos7840_port->port_num != 1) && (serial->num_ports == 2)) {
1667 Data = 0xff;
1668 status = mos7840_set_reg_sync(port,
1669 (__u16) (ZLP_REG1 +
1670 ((__u16)mos7840_port->port_num)), Data);
1671 dev_dbg(&port->dev, "ZLIP offset %x\n",
1672 (__u16)(ZLP_REG1 + ((__u16) mos7840_port->port_num)));
1673 if (status < 0) {
1674 dev_dbg(&port->dev, "Writing ZLP_REG%d failed status-0x%x\n", pnum + 2, status);
1675 goto error;
1676 } else
1677 dev_dbg(&port->dev, "ZLP_REG%d Writing success status%d\n", pnum + 2, status);
1678 } else {
1679 Data = 0xff;
1680 status = mos7840_set_reg_sync(port,
1681 (__u16) (ZLP_REG1 +
1682 ((__u16)mos7840_port->port_num) - 0x1), Data);
1683 dev_dbg(&port->dev, "ZLIP offset %x\n",
1684 (__u16)(ZLP_REG1 + ((__u16) mos7840_port->port_num) - 0x1));
1685 if (status < 0) {
1686 dev_dbg(&port->dev, "Writing ZLP_REG%d failed status-0x%x\n", pnum + 1, status);
1687 goto error;
1688 } else
1689 dev_dbg(&port->dev, "ZLP_REG%d Writing success status%d\n", pnum + 1, status);
1690
1691 }
1692
1693 mos7840_port->has_led = device_flags & MCS_LED;
1694
1695 /* Initialize LED timers */
1696 if (mos7840_port->has_led) {
1697 mos7840_port->led_urb = usb_alloc_urb(0, GFP_KERNEL);
1698 mos7840_port->led_dr = kmalloc(sizeof(*mos7840_port->led_dr),
1699 GFP_KERNEL);
1700 if (!mos7840_port->led_urb || !mos7840_port->led_dr) {
1701 status = -ENOMEM;
1702 goto error;
1703 }
1704
1705 timer_setup(&mos7840_port->led_timer1, mos7840_led_off, 0);
1706 mos7840_port->led_timer1.expires =
1707 jiffies + msecs_to_jiffies(LED_ON_MS);
1708 timer_setup(&mos7840_port->led_timer2, mos7840_led_flag_off,
1709 0);
1710 mos7840_port->led_timer2.expires =
1711 jiffies + msecs_to_jiffies(LED_OFF_MS);
1712
1713 /* Turn off LED */
1714 mos7840_set_led_sync(port, MODEM_CONTROL_REGISTER, 0x0300);
1715 }
1716
1717 return 0;
1718error:
1719 kfree(mos7840_port->led_dr);
1720 usb_free_urb(mos7840_port->led_urb);
1721 kfree(mos7840_port);
1722
1723 return status;
1724}
1725
1726static void mos7840_port_remove(struct usb_serial_port *port)
1727{
1728 struct moschip_port *mos7840_port = usb_get_serial_port_data(port);
1729
1730 if (mos7840_port->has_led) {
1731 /* Turn off LED */
1732 mos7840_set_led_sync(port, MODEM_CONTROL_REGISTER, 0x0300);
1733
1734 del_timer_sync(&mos7840_port->led_timer1);
1735 del_timer_sync(&mos7840_port->led_timer2);
1736
1737 usb_kill_urb(mos7840_port->led_urb);
1738 usb_free_urb(mos7840_port->led_urb);
1739 kfree(mos7840_port->led_dr);
1740 }
1741
1742 kfree(mos7840_port);
1743}
1744
1745static struct usb_serial_driver moschip7840_4port_device = {
1746 .driver = {
1747 .owner = THIS_MODULE,
1748 .name = "mos7840",
1749 },
1750 .description = DRIVER_DESC,
1751 .id_table = id_table,
1752 .num_interrupt_in = 1,
1753 .open = mos7840_open,
1754 .close = mos7840_close,
1755 .write = mos7840_write,
1756 .write_room = mos7840_write_room,
1757 .chars_in_buffer = mos7840_chars_in_buffer,
1758 .throttle = mos7840_throttle,
1759 .unthrottle = mos7840_unthrottle,
1760 .calc_num_ports = mos7840_calc_num_ports,
1761 .probe = mos7840_probe,
1762 .attach = mos7840_attach,
1763 .ioctl = mos7840_ioctl,
1764 .set_termios = mos7840_set_termios,
1765 .break_ctl = mos7840_break,
1766 .tiocmget = mos7840_tiocmget,
1767 .tiocmset = mos7840_tiocmset,
1768 .get_icount = usb_serial_generic_get_icount,
1769 .port_probe = mos7840_port_probe,
1770 .port_remove = mos7840_port_remove,
1771 .read_bulk_callback = mos7840_bulk_in_callback,
1772};
1773
1774static struct usb_serial_driver * const serial_drivers[] = {
1775 &moschip7840_4port_device, NULL
1776};
1777
1778module_usb_serial_driver(serial_drivers, id_table);
1779
1780MODULE_DESCRIPTION(DRIVER_DESC);
1781MODULE_LICENSE("GPL");