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Merge tag 'usb-4.19-rc6' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/usb
[linux-2.6/btrfs-unstable.git] / drivers / usb / serial / mos7840.c
blobb42bad85097ae853a49740a87356ec284bde2482
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 /* vendor id and device id defines */
93
94 /* The native mos7840/7820 component */
95 #define USB_VENDOR_ID_MOSCHIP 0x9710
96 #define MOSCHIP_DEVICE_ID_7840 0x7840
97 #define MOSCHIP_DEVICE_ID_7820 0x7820
98 #define MOSCHIP_DEVICE_ID_7810 0x7810
99 /* The native component can have its vendor/device id's overridden
100 * in vendor-specific implementations. Such devices can be handled
101 * by making a change here, in id_table.
102 */
103 #define USB_VENDOR_ID_BANDB 0x0856
104 #define BANDB_DEVICE_ID_USO9ML2_2 0xAC22
105 #define BANDB_DEVICE_ID_USO9ML2_2P 0xBC00
106 #define BANDB_DEVICE_ID_USO9ML2_4 0xAC24
107 #define BANDB_DEVICE_ID_USO9ML2_4P 0xBC01
108 #define BANDB_DEVICE_ID_US9ML2_2 0xAC29
109 #define BANDB_DEVICE_ID_US9ML2_4 0xAC30
110 #define BANDB_DEVICE_ID_USPTL4_2 0xAC31
111 #define BANDB_DEVICE_ID_USPTL4_4 0xAC32
112 #define BANDB_DEVICE_ID_USOPTL4_2 0xAC42
113 #define BANDB_DEVICE_ID_USOPTL4_2P 0xBC02
114 #define BANDB_DEVICE_ID_USOPTL4_4 0xAC44
115 #define BANDB_DEVICE_ID_USOPTL4_4P 0xBC03
116 #define BANDB_DEVICE_ID_USOPTL2_4 0xAC24
117
118 /* This driver also supports
119 * ATEN UC2324 device using Moschip MCS7840
120 * ATEN UC2322 device using Moschip MCS7820
121 */
122 #define USB_VENDOR_ID_ATENINTL 0x0557
123 #define ATENINTL_DEVICE_ID_UC2324 0x2011
124 #define ATENINTL_DEVICE_ID_UC2322 0x7820
125
126 /* Interrupt Routine Defines */
127
128 #define SERIAL_IIR_RLS 0x06
129 #define SERIAL_IIR_MS 0x00
130
131 /*
132 * Emulation of the bit mask on the LINE STATUS REGISTER.
133 */
134 #define SERIAL_LSR_DR 0x0001
135 #define SERIAL_LSR_OE 0x0002
136 #define SERIAL_LSR_PE 0x0004
137 #define SERIAL_LSR_FE 0x0008
138 #define SERIAL_LSR_BI 0x0010
139
140 #define MOS_MSR_DELTA_CTS 0x10
141 #define MOS_MSR_DELTA_DSR 0x20
142 #define MOS_MSR_DELTA_RI 0x40
143 #define MOS_MSR_DELTA_CD 0x80
144
145 /* Serial Port register Address */
146 #define INTERRUPT_ENABLE_REGISTER ((__u16)(0x01))
147 #define FIFO_CONTROL_REGISTER ((__u16)(0x02))
148 #define LINE_CONTROL_REGISTER ((__u16)(0x03))
149 #define MODEM_CONTROL_REGISTER ((__u16)(0x04))
150 #define LINE_STATUS_REGISTER ((__u16)(0x05))
151 #define MODEM_STATUS_REGISTER ((__u16)(0x06))
152 #define SCRATCH_PAD_REGISTER ((__u16)(0x07))
153 #define DIVISOR_LATCH_LSB ((__u16)(0x00))
154 #define DIVISOR_LATCH_MSB ((__u16)(0x01))
155
156 #define CLK_MULTI_REGISTER ((__u16)(0x02))
157 #define CLK_START_VALUE_REGISTER ((__u16)(0x03))
158 #define GPIO_REGISTER ((__u16)(0x07))
159
160 #define SERIAL_LCR_DLAB ((__u16)(0x0080))
161
162 /*
163 * URB POOL related defines
164 */
165 #define NUM_URBS 16 /* URB Count */
166 #define URB_TRANSFER_BUFFER_SIZE 32 /* URB Size */
167
168 /* LED on/off milliseconds*/
169 #define LED_ON_MS 500
170 #define LED_OFF_MS 500
171
172 enum mos7840_flag {
173 MOS7840_FLAG_CTRL_BUSY,
174 MOS7840_FLAG_LED_BUSY,
175 };
176
177 static const struct usb_device_id id_table[] = {
178 {USB_DEVICE(USB_VENDOR_ID_MOSCHIP, MOSCHIP_DEVICE_ID_7840)},
179 {USB_DEVICE(USB_VENDOR_ID_MOSCHIP, MOSCHIP_DEVICE_ID_7820)},
180 {USB_DEVICE(USB_VENDOR_ID_MOSCHIP, MOSCHIP_DEVICE_ID_7810)},
181 {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USO9ML2_2)},
182 {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USO9ML2_2P)},
183 {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USO9ML2_4)},
184 {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USO9ML2_4P)},
185 {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_US9ML2_2)},
186 {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_US9ML2_4)},
187 {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USPTL4_2)},
188 {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USPTL4_4)},
189 {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USOPTL4_2)},
190 {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USOPTL4_2P)},
191 {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USOPTL4_4)},
192 {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USOPTL4_4P)},
193 {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USOPTL2_4)},
194 {USB_DEVICE(USB_VENDOR_ID_ATENINTL, ATENINTL_DEVICE_ID_UC2324)},
195 {USB_DEVICE(USB_VENDOR_ID_ATENINTL, ATENINTL_DEVICE_ID_UC2322)},
196 {} /* terminating entry */
197 };
198 MODULE_DEVICE_TABLE(usb, id_table);
199
200 /* This structure holds all of the local port information */
201
202 struct moschip_port {
203 int port_num; /*Actual port number in the device(1,2,etc) */
204 struct urb *read_urb; /* read URB for this port */
205 __u8 shadowLCR; /* last LCR value received */
206 __u8 shadowMCR; /* last MCR value received */
207 char open;
208 char open_ports;
209 struct usb_serial_port *port; /* loop back to the owner of this object */
210
211 /* Offsets */
212 __u8 SpRegOffset;
213 __u8 ControlRegOffset;
214 __u8 DcrRegOffset;
215 /* for processing control URBS in interrupt context */
216 struct urb *control_urb;
217 struct usb_ctrlrequest *dr;
218 char *ctrl_buf;
219 int MsrLsr;
220
221 spinlock_t pool_lock;
222 struct urb *write_urb_pool[NUM_URBS];
223 char busy[NUM_URBS];
224 bool read_urb_busy;
225
226 /* For device(s) with LED indicator */
227 bool has_led;
228 struct timer_list led_timer1; /* Timer for LED on */
229 struct timer_list led_timer2; /* Timer for LED off */
230 struct urb *led_urb;
231 struct usb_ctrlrequest *led_dr;
232
233 unsigned long flags;
234 };
235
236 /*
237 * mos7840_set_reg_sync
238 * To set the Control register by calling usb_fill_control_urb function
239 * by passing usb_sndctrlpipe function as parameter.
240 */
241
242 static int mos7840_set_reg_sync(struct usb_serial_port *port, __u16 reg,
243 __u16 val)
244 {
245 struct usb_device *dev = port->serial->dev;
246 val = val & 0x00ff;
247 dev_dbg(&port->dev, "mos7840_set_reg_sync offset is %x, value %x\n", reg, val);
248
249 return usb_control_msg(dev, usb_sndctrlpipe(dev, 0), MCS_WRREQ,
250 MCS_WR_RTYPE, val, reg, NULL, 0,
251 MOS_WDR_TIMEOUT);
252 }
253
254 /*
255 * mos7840_get_reg_sync
256 * To set the Uart register by calling usb_fill_control_urb function by
257 * passing usb_rcvctrlpipe function as parameter.
258 */
259
260 static int mos7840_get_reg_sync(struct usb_serial_port *port, __u16 reg,
261 __u16 *val)
262 {
263 struct usb_device *dev = port->serial->dev;
264 int ret = 0;
265 u8 *buf;
266
267 buf = kmalloc(VENDOR_READ_LENGTH, GFP_KERNEL);
268 if (!buf)
269 return -ENOMEM;
270
271 ret = usb_control_msg(dev, usb_rcvctrlpipe(dev, 0), MCS_RDREQ,
272 MCS_RD_RTYPE, 0, reg, buf, VENDOR_READ_LENGTH,
273 MOS_WDR_TIMEOUT);
274 if (ret < VENDOR_READ_LENGTH) {
275 if (ret >= 0)
276 ret = -EIO;
277 goto out;
278 }
279
280 *val = buf[0];
281 dev_dbg(&port->dev, "%s offset is %x, return val %x\n", __func__, reg, *val);
282 out:
283 kfree(buf);
284 return ret;
285 }
286
287 /*
288 * mos7840_set_uart_reg
289 * To set the Uart register by calling usb_fill_control_urb function by
290 * passing usb_sndctrlpipe function as parameter.
291 */
292
293 static int mos7840_set_uart_reg(struct usb_serial_port *port, __u16 reg,
294 __u16 val)
295 {
296
297 struct usb_device *dev = port->serial->dev;
298 val = val & 0x00ff;
299 /* For the UART control registers, the application number need
300 to be Or'ed */
301 if (port->serial->num_ports == 4) {
302 val |= ((__u16)port->port_number + 1) << 8;
303 } else {
304 if (port->port_number == 0) {
305 val |= ((__u16)port->port_number + 1) << 8;
306 } else {
307 val |= ((__u16)port->port_number + 2) << 8;
308 }
309 }
310 dev_dbg(&port->dev, "%s application number is %x\n", __func__, val);
311 return usb_control_msg(dev, usb_sndctrlpipe(dev, 0), MCS_WRREQ,
312 MCS_WR_RTYPE, val, reg, NULL, 0,
313 MOS_WDR_TIMEOUT);
314
315 }
316
317 /*
318 * mos7840_get_uart_reg
319 * To set the Control register by calling usb_fill_control_urb function
320 * by passing usb_rcvctrlpipe function as parameter.
321 */
322 static int mos7840_get_uart_reg(struct usb_serial_port *port, __u16 reg,
323 __u16 *val)
324 {
325 struct usb_device *dev = port->serial->dev;
326 int ret = 0;
327 __u16 Wval;
328 u8 *buf;
329
330 buf = kmalloc(VENDOR_READ_LENGTH, GFP_KERNEL);
331 if (!buf)
332 return -ENOMEM;
333
334 /* Wval is same as application number */
335 if (port->serial->num_ports == 4) {
336 Wval = ((__u16)port->port_number + 1) << 8;
337 } else {
338 if (port->port_number == 0) {
339 Wval = ((__u16)port->port_number + 1) << 8;
340 } else {
341 Wval = ((__u16)port->port_number + 2) << 8;
342 }
343 }
344 dev_dbg(&port->dev, "%s application number is %x\n", __func__, Wval);
345 ret = usb_control_msg(dev, usb_rcvctrlpipe(dev, 0), MCS_RDREQ,
346 MCS_RD_RTYPE, Wval, reg, buf, VENDOR_READ_LENGTH,
347 MOS_WDR_TIMEOUT);
348 if (ret < VENDOR_READ_LENGTH) {
349 if (ret >= 0)
350 ret = -EIO;
351 goto out;
352 }
353 *val = buf[0];
354 out:
355 kfree(buf);
356 return ret;
357 }
358
359 static void mos7840_dump_serial_port(struct usb_serial_port *port,
360 struct moschip_port *mos7840_port)
361 {
362
363 dev_dbg(&port->dev, "SpRegOffset is %2x\n", mos7840_port->SpRegOffset);
364 dev_dbg(&port->dev, "ControlRegOffset is %2x\n", mos7840_port->ControlRegOffset);
365 dev_dbg(&port->dev, "DCRRegOffset is %2x\n", mos7840_port->DcrRegOffset);
366
367 }
368
369 /************************************************************************/
370 /************************************************************************/
371 /* I N T E R F A C E F U N C T I O N S */
372 /* I N T E R F A C E F U N C T I O N S */
373 /************************************************************************/
374 /************************************************************************/
375
376 static inline void mos7840_set_port_private(struct usb_serial_port *port,
377 struct moschip_port *data)
378 {
379 usb_set_serial_port_data(port, (void *)data);
380 }
381
382 static inline struct moschip_port *mos7840_get_port_private(struct
383 usb_serial_port
384 *port)
385 {
386 return (struct moschip_port *)usb_get_serial_port_data(port);
387 }
388
389 static void mos7840_handle_new_msr(struct moschip_port *port, __u8 new_msr)
390 {
391 struct moschip_port *mos7840_port;
392 struct async_icount *icount;
393 mos7840_port = port;
394 if (new_msr &
395 (MOS_MSR_DELTA_CTS | MOS_MSR_DELTA_DSR | MOS_MSR_DELTA_RI |
396 MOS_MSR_DELTA_CD)) {
397 icount = &mos7840_port->port->icount;
398
399 /* update input line counters */
400 if (new_msr & MOS_MSR_DELTA_CTS)
401 icount->cts++;
402 if (new_msr & MOS_MSR_DELTA_DSR)
403 icount->dsr++;
404 if (new_msr & MOS_MSR_DELTA_CD)
405 icount->dcd++;
406 if (new_msr & MOS_MSR_DELTA_RI)
407 icount->rng++;
408
409 wake_up_interruptible(&port->port->port.delta_msr_wait);
410 }
411 }
412
413 static void mos7840_handle_new_lsr(struct moschip_port *port, __u8 new_lsr)
414 {
415 struct async_icount *icount;
416
417 if (new_lsr & SERIAL_LSR_BI) {
418 /*
419 * Parity and Framing errors only count if they
420 * occur exclusive of a break being
421 * received.
422 */
423 new_lsr &= (__u8) (SERIAL_LSR_OE | SERIAL_LSR_BI);
424 }
425
426 /* update input line counters */
427 icount = &port->port->icount;
428 if (new_lsr & SERIAL_LSR_BI)
429 icount->brk++;
430 if (new_lsr & SERIAL_LSR_OE)
431 icount->overrun++;
432 if (new_lsr & SERIAL_LSR_PE)
433 icount->parity++;
434 if (new_lsr & SERIAL_LSR_FE)
435 icount->frame++;
436 }
437
438 /************************************************************************/
439 /************************************************************************/
440 /* U S B C A L L B A C K F U N C T I O N S */
441 /* U S B C A L L B A C K F U N C T I O N S */
442 /************************************************************************/
443 /************************************************************************/
444
445 static void mos7840_control_callback(struct urb *urb)
446 {
447 unsigned char *data;
448 struct moschip_port *mos7840_port;
449 struct device *dev = &urb->dev->dev;
450 __u8 regval = 0x0;
451 int status = urb->status;
452
453 mos7840_port = urb->context;
454
455 switch (status) {
456 case 0:
457 /* success */
458 break;
459 case -ECONNRESET:
460 case -ENOENT:
461 case -ESHUTDOWN:
462 /* this urb is terminated, clean up */
463 dev_dbg(dev, "%s - urb shutting down with status: %d\n", __func__, status);
464 goto out;
465 default:
466 dev_dbg(dev, "%s - nonzero urb status received: %d\n", __func__, status);
467 goto out;
468 }
469
470 dev_dbg(dev, "%s urb buffer size is %d\n", __func__, urb->actual_length);
471 if (urb->actual_length < 1)
472 goto out;
473
474 dev_dbg(dev, "%s mos7840_port->MsrLsr is %d port %d\n", __func__,
475 mos7840_port->MsrLsr, mos7840_port->port_num);
476 data = urb->transfer_buffer;
477 regval = (__u8) data[0];
478 dev_dbg(dev, "%s data is %x\n", __func__, regval);
479 if (mos7840_port->MsrLsr == 0)
480 mos7840_handle_new_msr(mos7840_port, regval);
481 else if (mos7840_port->MsrLsr == 1)
482 mos7840_handle_new_lsr(mos7840_port, regval);
483 out:
484 clear_bit_unlock(MOS7840_FLAG_CTRL_BUSY, &mos7840_port->flags);
485 }
486
487 static int mos7840_get_reg(struct moschip_port *mcs, __u16 Wval, __u16 reg,
488 __u16 *val)
489 {
490 struct usb_device *dev = mcs->port->serial->dev;
491 struct usb_ctrlrequest *dr = mcs->dr;
492 unsigned char *buffer = mcs->ctrl_buf;
493 int ret;
494
495 if (test_and_set_bit_lock(MOS7840_FLAG_CTRL_BUSY, &mcs->flags))
496 return -EBUSY;
497
498 dr->bRequestType = MCS_RD_RTYPE;
499 dr->bRequest = MCS_RDREQ;
500 dr->wValue = cpu_to_le16(Wval); /* 0 */
501 dr->wIndex = cpu_to_le16(reg);
502 dr->wLength = cpu_to_le16(2);
503
504 usb_fill_control_urb(mcs->control_urb, dev, usb_rcvctrlpipe(dev, 0),
505 (unsigned char *)dr, buffer, 2,
506 mos7840_control_callback, mcs);
507 mcs->control_urb->transfer_buffer_length = 2;
508 ret = usb_submit_urb(mcs->control_urb, GFP_ATOMIC);
509 if (ret)
510 clear_bit_unlock(MOS7840_FLAG_CTRL_BUSY, &mcs->flags);
511
512 return ret;
513 }
514
515 static void mos7840_set_led_callback(struct urb *urb)
516 {
517 switch (urb->status) {
518 case 0:
519 /* Success */
520 break;
521 case -ECONNRESET:
522 case -ENOENT:
523 case -ESHUTDOWN:
524 /* This urb is terminated, clean up */
525 dev_dbg(&urb->dev->dev, "%s - urb shutting down: %d\n",
526 __func__, urb->status);
527 break;
528 default:
529 dev_dbg(&urb->dev->dev, "%s - nonzero urb status: %d\n",
530 __func__, urb->status);
531 }
532 }
533
534 static void mos7840_set_led_async(struct moschip_port *mcs, __u16 wval,
535 __u16 reg)
536 {
537 struct usb_device *dev = mcs->port->serial->dev;
538 struct usb_ctrlrequest *dr = mcs->led_dr;
539
540 dr->bRequestType = MCS_WR_RTYPE;
541 dr->bRequest = MCS_WRREQ;
542 dr->wValue = cpu_to_le16(wval);
543 dr->wIndex = cpu_to_le16(reg);
544 dr->wLength = cpu_to_le16(0);
545
546 usb_fill_control_urb(mcs->led_urb, dev, usb_sndctrlpipe(dev, 0),
547 (unsigned char *)dr, NULL, 0, mos7840_set_led_callback, NULL);
548
549 usb_submit_urb(mcs->led_urb, GFP_ATOMIC);
550 }
551
552 static void mos7840_set_led_sync(struct usb_serial_port *port, __u16 reg,
553 __u16 val)
554 {
555 struct usb_device *dev = port->serial->dev;
556
557 usb_control_msg(dev, usb_sndctrlpipe(dev, 0), MCS_WRREQ, MCS_WR_RTYPE,
558 val, reg, NULL, 0, MOS_WDR_TIMEOUT);
559 }
560
561 static void mos7840_led_off(struct timer_list *t)
562 {
563 struct moschip_port *mcs = from_timer(mcs, t, led_timer1);
564
565 /* Turn off LED */
566 mos7840_set_led_async(mcs, 0x0300, MODEM_CONTROL_REGISTER);
567 mod_timer(&mcs->led_timer2,
568 jiffies + msecs_to_jiffies(LED_OFF_MS));
569 }
570
571 static void mos7840_led_flag_off(struct timer_list *t)
572 {
573 struct moschip_port *mcs = from_timer(mcs, t, led_timer2);
574
575 clear_bit_unlock(MOS7840_FLAG_LED_BUSY, &mcs->flags);
576 }
577
578 static void mos7840_led_activity(struct usb_serial_port *port)
579 {
580 struct moschip_port *mos7840_port = usb_get_serial_port_data(port);
581
582 if (test_and_set_bit_lock(MOS7840_FLAG_LED_BUSY, &mos7840_port->flags))
583 return;
584
585 mos7840_set_led_async(mos7840_port, 0x0301, MODEM_CONTROL_REGISTER);
586 mod_timer(&mos7840_port->led_timer1,
587 jiffies + msecs_to_jiffies(LED_ON_MS));
588 }
589
590 /*****************************************************************************
591 * mos7840_interrupt_callback
592 * this is the callback function for when we have received data on the
593 * interrupt endpoint.
594 *****************************************************************************/
595
596 static void mos7840_interrupt_callback(struct urb *urb)
597 {
598 int result;
599 int length;
600 struct moschip_port *mos7840_port;
601 struct usb_serial *serial;
602 __u16 Data;
603 unsigned char *data;
604 __u8 sp[5], st;
605 int i, rv = 0;
606 __u16 wval, wreg = 0;
607 int status = urb->status;
608
609 switch (status) {
610 case 0:
611 /* success */
612 break;
613 case -ECONNRESET:
614 case -ENOENT:
615 case -ESHUTDOWN:
616 /* this urb is terminated, clean up */
617 dev_dbg(&urb->dev->dev, "%s - urb shutting down with status: %d\n",
618 __func__, status);
619 return;
620 default:
621 dev_dbg(&urb->dev->dev, "%s - nonzero urb status received: %d\n",
622 __func__, status);
623 goto exit;
624 }
625
626 length = urb->actual_length;
627 data = urb->transfer_buffer;
628
629 serial = urb->context;
630
631 /* Moschip get 5 bytes
632 * Byte 1 IIR Port 1 (port.number is 0)
633 * Byte 2 IIR Port 2 (port.number is 1)
634 * Byte 3 IIR Port 3 (port.number is 2)
635 * Byte 4 IIR Port 4 (port.number is 3)
636 * Byte 5 FIFO status for both */
637
638 if (length > 5) {
639 dev_dbg(&urb->dev->dev, "%s", "Wrong data !!!\n");
640 return;
641 }
642
643 sp[0] = (__u8) data[0];
644 sp[1] = (__u8) data[1];
645 sp[2] = (__u8) data[2];
646 sp[3] = (__u8) data[3];
647 st = (__u8) data[4];
648
649 for (i = 0; i < serial->num_ports; i++) {
650 mos7840_port = mos7840_get_port_private(serial->port[i]);
651 wval = ((__u16)serial->port[i]->port_number + 1) << 8;
652 if (mos7840_port->open) {
653 if (sp[i] & 0x01) {
654 dev_dbg(&urb->dev->dev, "SP%d No Interrupt !!!\n", i);
655 } else {
656 switch (sp[i] & 0x0f) {
657 case SERIAL_IIR_RLS:
658 dev_dbg(&urb->dev->dev, "Serial Port %d: Receiver status error or \n", i);
659 dev_dbg(&urb->dev->dev, "address bit detected in 9-bit mode\n");
660 mos7840_port->MsrLsr = 1;
661 wreg = LINE_STATUS_REGISTER;
662 break;
663 case SERIAL_IIR_MS:
664 dev_dbg(&urb->dev->dev, "Serial Port %d: Modem status change\n", i);
665 mos7840_port->MsrLsr = 0;
666 wreg = MODEM_STATUS_REGISTER;
667 break;
668 }
669 rv = mos7840_get_reg(mos7840_port, wval, wreg, &Data);
670 }
671 }
672 }
673 if (!(rv < 0))
674 /* the completion handler for the control urb will resubmit */
675 return;
676 exit:
677 result = usb_submit_urb(urb, GFP_ATOMIC);
678 if (result) {
679 dev_err(&urb->dev->dev,
680 "%s - Error %d submitting interrupt urb\n",
681 __func__, result);
682 }
683 }
684
685 static int mos7840_port_paranoia_check(struct usb_serial_port *port,
686 const char *function)
687 {
688 if (!port) {
689 pr_debug("%s - port == NULL\n", function);
690 return -1;
691 }
692 if (!port->serial) {
693 pr_debug("%s - port->serial == NULL\n", function);
694 return -1;
695 }
696
697 return 0;
698 }
699
700 /* Inline functions to check the sanity of a pointer that is passed to us */
701 static int mos7840_serial_paranoia_check(struct usb_serial *serial,
702 const char *function)
703 {
704 if (!serial) {
705 pr_debug("%s - serial == NULL\n", function);
706 return -1;
707 }
708 if (!serial->type) {
709 pr_debug("%s - serial->type == NULL!\n", function);
710 return -1;
711 }
712
713 return 0;
714 }
715
716 static struct usb_serial *mos7840_get_usb_serial(struct usb_serial_port *port,
717 const char *function)
718 {
719 /* if no port was specified, or it fails a paranoia check */
720 if (!port ||
721 mos7840_port_paranoia_check(port, function) ||
722 mos7840_serial_paranoia_check(port->serial, function)) {
723 /* then say that we don't have a valid usb_serial thing,
724 * which will end up genrating -ENODEV return values */
725 return NULL;
726 }
727
728 return port->serial;
729 }
730
731 /*****************************************************************************
732 * mos7840_bulk_in_callback
733 * this is the callback function for when we have received data on the
734 * bulk in endpoint.
735 *****************************************************************************/
736
737 static void mos7840_bulk_in_callback(struct urb *urb)
738 {
739 int retval;
740 unsigned char *data;
741 struct usb_serial *serial;
742 struct usb_serial_port *port;
743 struct moschip_port *mos7840_port;
744 int status = urb->status;
745
746 mos7840_port = urb->context;
747 if (!mos7840_port)
748 return;
749
750 if (status) {
751 dev_dbg(&urb->dev->dev, "nonzero read bulk status received: %d\n", status);
752 mos7840_port->read_urb_busy = false;
753 return;
754 }
755
756 port = mos7840_port->port;
757 if (mos7840_port_paranoia_check(port, __func__)) {
758 mos7840_port->read_urb_busy = false;
759 return;
760 }
761
762 serial = mos7840_get_usb_serial(port, __func__);
763 if (!serial) {
764 mos7840_port->read_urb_busy = false;
765 return;
766 }
767
768 data = urb->transfer_buffer;
769 usb_serial_debug_data(&port->dev, __func__, urb->actual_length, data);
770
771 if (urb->actual_length) {
772 struct tty_port *tport = &mos7840_port->port->port;
773 tty_insert_flip_string(tport, data, urb->actual_length);
774 tty_flip_buffer_push(tport);
775 port->icount.rx += urb->actual_length;
776 dev_dbg(&port->dev, "icount.rx is %d:\n", port->icount.rx);
777 }
778
779 if (!mos7840_port->read_urb) {
780 dev_dbg(&port->dev, "%s", "URB KILLED !!!\n");
781 mos7840_port->read_urb_busy = false;
782 return;
783 }
784
785 if (mos7840_port->has_led)
786 mos7840_led_activity(port);
787
788 mos7840_port->read_urb_busy = true;
789 retval = usb_submit_urb(mos7840_port->read_urb, GFP_ATOMIC);
790
791 if (retval) {
792 dev_dbg(&port->dev, "usb_submit_urb(read bulk) failed, retval = %d\n", retval);
793 mos7840_port->read_urb_busy = false;
794 }
795 }
796
797 /*****************************************************************************
798 * mos7840_bulk_out_data_callback
799 * this is the callback function for when we have finished sending
800 * serial data on the bulk out endpoint.
801 *****************************************************************************/
802
803 static void mos7840_bulk_out_data_callback(struct urb *urb)
804 {
805 struct moschip_port *mos7840_port;
806 struct usb_serial_port *port;
807 int status = urb->status;
808 unsigned long flags;
809 int i;
810
811 mos7840_port = urb->context;
812 port = mos7840_port->port;
813 spin_lock_irqsave(&mos7840_port->pool_lock, flags);
814 for (i = 0; i < NUM_URBS; i++) {
815 if (urb == mos7840_port->write_urb_pool[i]) {
816 mos7840_port->busy[i] = 0;
817 break;
818 }
819 }
820 spin_unlock_irqrestore(&mos7840_port->pool_lock, flags);
821
822 if (status) {
823 dev_dbg(&port->dev, "nonzero write bulk status received:%d\n", status);
824 return;
825 }
826
827 if (mos7840_port_paranoia_check(port, __func__))
828 return;
829
830 if (mos7840_port->open)
831 tty_port_tty_wakeup(&port->port);
832
833 }
834
835 /************************************************************************/
836 /* 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 */
837 /************************************************************************/
838
839 /*****************************************************************************
840 * mos7840_open
841 * this function is called by the tty driver when a port is opened
842 * If successful, we return 0
843 * Otherwise we return a negative error number.
844 *****************************************************************************/
845
846 static int mos7840_open(struct tty_struct *tty, struct usb_serial_port *port)
847 {
848 int response;
849 int j;
850 struct usb_serial *serial;
851 struct urb *urb;
852 __u16 Data;
853 int status;
854 struct moschip_port *mos7840_port;
855 struct moschip_port *port0;
856
857 if (mos7840_port_paranoia_check(port, __func__))
858 return -ENODEV;
859
860 serial = port->serial;
861
862 if (mos7840_serial_paranoia_check(serial, __func__))
863 return -ENODEV;
864
865 mos7840_port = mos7840_get_port_private(port);
866 port0 = mos7840_get_port_private(serial->port[0]);
867
868 if (mos7840_port == NULL || port0 == NULL)
869 return -ENODEV;
870
871 usb_clear_halt(serial->dev, port->write_urb->pipe);
872 usb_clear_halt(serial->dev, port->read_urb->pipe);
873 port0->open_ports++;
874
875 /* Initialising the write urb pool */
876 for (j = 0; j < NUM_URBS; ++j) {
877 urb = usb_alloc_urb(0, GFP_KERNEL);
878 mos7840_port->write_urb_pool[j] = urb;
879 if (!urb)
880 continue;
881
882 urb->transfer_buffer = kmalloc(URB_TRANSFER_BUFFER_SIZE,
883 GFP_KERNEL);
884 if (!urb->transfer_buffer) {
885 usb_free_urb(urb);
886 mos7840_port->write_urb_pool[j] = NULL;
887 continue;
888 }
889 }
890
891 /*****************************************************************************
892 * Initialize MCS7840 -- Write Init values to corresponding Registers
893 *
894 * Register Index
895 * 1 : IER
896 * 2 : FCR
897 * 3 : LCR
898 * 4 : MCR
899 *
900 * 0x08 : SP1/2 Control Reg
901 *****************************************************************************/
902
903 /* NEED to check the following Block */
904
905 Data = 0x0;
906 status = mos7840_get_reg_sync(port, mos7840_port->SpRegOffset, &Data);
907 if (status < 0) {
908 dev_dbg(&port->dev, "Reading Spreg failed\n");
909 goto err;
910 }
911 Data |= 0x80;
912 status = mos7840_set_reg_sync(port, mos7840_port->SpRegOffset, Data);
913 if (status < 0) {
914 dev_dbg(&port->dev, "writing Spreg failed\n");
915 goto err;
916 }
917
918 Data &= ~0x80;
919 status = mos7840_set_reg_sync(port, mos7840_port->SpRegOffset, Data);
920 if (status < 0) {
921 dev_dbg(&port->dev, "writing Spreg failed\n");
922 goto err;
923 }
924 /* End of block to be checked */
925
926 Data = 0x0;
927 status = mos7840_get_reg_sync(port, mos7840_port->ControlRegOffset,
928 &Data);
929 if (status < 0) {
930 dev_dbg(&port->dev, "Reading Controlreg failed\n");
931 goto err;
932 }
933 Data |= 0x08; /* Driver done bit */
934 Data |= 0x20; /* rx_disable */
935 status = mos7840_set_reg_sync(port,
936 mos7840_port->ControlRegOffset, Data);
937 if (status < 0) {
938 dev_dbg(&port->dev, "writing Controlreg failed\n");
939 goto err;
940 }
941 /* do register settings here */
942 /* Set all regs to the device default values. */
943 /***********************************
944 * First Disable all interrupts.
945 ***********************************/
946 Data = 0x00;
947 status = mos7840_set_uart_reg(port, INTERRUPT_ENABLE_REGISTER, Data);
948 if (status < 0) {
949 dev_dbg(&port->dev, "disabling interrupts failed\n");
950 goto err;
951 }
952 /* Set FIFO_CONTROL_REGISTER to the default value */
953 Data = 0x00;
954 status = mos7840_set_uart_reg(port, FIFO_CONTROL_REGISTER, Data);
955 if (status < 0) {
956 dev_dbg(&port->dev, "Writing FIFO_CONTROL_REGISTER failed\n");
957 goto err;
958 }
959
960 Data = 0xcf;
961 status = mos7840_set_uart_reg(port, FIFO_CONTROL_REGISTER, Data);
962 if (status < 0) {
963 dev_dbg(&port->dev, "Writing FIFO_CONTROL_REGISTER failed\n");
964 goto err;
965 }
966
967 Data = 0x03;
968 status = mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data);
969 mos7840_port->shadowLCR = Data;
970
971 Data = 0x0b;
972 status = mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER, Data);
973 mos7840_port->shadowMCR = Data;
974
975 Data = 0x00;
976 status = mos7840_get_uart_reg(port, LINE_CONTROL_REGISTER, &Data);
977 mos7840_port->shadowLCR = Data;
978
979 Data |= SERIAL_LCR_DLAB; /* data latch enable in LCR 0x80 */
980 status = mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data);
981
982 Data = 0x0c;
983 status = mos7840_set_uart_reg(port, DIVISOR_LATCH_LSB, Data);
984
985 Data = 0x0;
986 status = mos7840_set_uart_reg(port, DIVISOR_LATCH_MSB, Data);
987
988 Data = 0x00;
989 status = mos7840_get_uart_reg(port, LINE_CONTROL_REGISTER, &Data);
990
991 Data = Data & ~SERIAL_LCR_DLAB;
992 status = mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data);
993 mos7840_port->shadowLCR = Data;
994
995 /* clearing Bulkin and Bulkout Fifo */
996 Data = 0x0;
997 status = mos7840_get_reg_sync(port, mos7840_port->SpRegOffset, &Data);
998
999 Data = Data | 0x0c;
1000 status = mos7840_set_reg_sync(port, mos7840_port->SpRegOffset, Data);
1001
1002 Data = Data & ~0x0c;
1003 status = mos7840_set_reg_sync(port, mos7840_port->SpRegOffset, Data);
1004 /* Finally enable all interrupts */
1005 Data = 0x0c;
1006 status = mos7840_set_uart_reg(port, INTERRUPT_ENABLE_REGISTER, Data);
1007
1008 /* clearing rx_disable */
1009 Data = 0x0;
1010 status = mos7840_get_reg_sync(port, mos7840_port->ControlRegOffset,
1011 &Data);
1012 Data = Data & ~0x20;
1013 status = mos7840_set_reg_sync(port, mos7840_port->ControlRegOffset,
1014 Data);
1015
1016 /* rx_negate */
1017 Data = 0x0;
1018 status = mos7840_get_reg_sync(port, mos7840_port->ControlRegOffset,
1019 &Data);
1020 Data = Data | 0x10;
1021 status = mos7840_set_reg_sync(port, mos7840_port->ControlRegOffset,
1022 Data);
1023
1024 /* Check to see if we've set up our endpoint info yet *
1025 * (can't set it up in mos7840_startup as the structures *
1026 * were not set up at that time.) */
1027 if (port0->open_ports == 1) {
1028 /* FIXME: Buffer never NULL, so URB is not submitted. */
1029 if (serial->port[0]->interrupt_in_buffer == NULL) {
1030 /* set up interrupt urb */
1031 usb_fill_int_urb(serial->port[0]->interrupt_in_urb,
1032 serial->dev,
1033 usb_rcvintpipe(serial->dev,
1034 serial->port[0]->interrupt_in_endpointAddress),
1035 serial->port[0]->interrupt_in_buffer,
1036 serial->port[0]->interrupt_in_urb->
1037 transfer_buffer_length,
1038 mos7840_interrupt_callback,
1039 serial,
1040 serial->port[0]->interrupt_in_urb->interval);
1041
1042 /* start interrupt read for mos7840 */
1043 response =
1044 usb_submit_urb(serial->port[0]->interrupt_in_urb,
1045 GFP_KERNEL);
1046 if (response) {
1047 dev_err(&port->dev, "%s - Error %d submitting "
1048 "interrupt urb\n", __func__, response);
1049 }
1050
1051 }
1052
1053 }
1054
1055 /* see if we've set up our endpoint info yet *
1056 * (can't set it up in mos7840_startup as the *
1057 * structures were not set up at that time.) */
1058
1059 dev_dbg(&port->dev, "port number is %d\n", port->port_number);
1060 dev_dbg(&port->dev, "minor number is %d\n", port->minor);
1061 dev_dbg(&port->dev, "Bulkin endpoint is %d\n", port->bulk_in_endpointAddress);
1062 dev_dbg(&port->dev, "BulkOut endpoint is %d\n", port->bulk_out_endpointAddress);
1063 dev_dbg(&port->dev, "Interrupt endpoint is %d\n", port->interrupt_in_endpointAddress);
1064 dev_dbg(&port->dev, "port's number in the device is %d\n", mos7840_port->port_num);
1065 mos7840_port->read_urb = port->read_urb;
1066
1067 /* set up our bulk in urb */
1068 if ((serial->num_ports == 2) && (((__u16)port->port_number % 2) != 0)) {
1069 usb_fill_bulk_urb(mos7840_port->read_urb,
1070 serial->dev,
1071 usb_rcvbulkpipe(serial->dev,
1072 (port->bulk_in_endpointAddress) + 2),
1073 port->bulk_in_buffer,
1074 mos7840_port->read_urb->transfer_buffer_length,
1075 mos7840_bulk_in_callback, mos7840_port);
1076 } else {
1077 usb_fill_bulk_urb(mos7840_port->read_urb,
1078 serial->dev,
1079 usb_rcvbulkpipe(serial->dev,
1080 port->bulk_in_endpointAddress),
1081 port->bulk_in_buffer,
1082 mos7840_port->read_urb->transfer_buffer_length,
1083 mos7840_bulk_in_callback, mos7840_port);
1084 }
1085
1086 dev_dbg(&port->dev, "%s: bulkin endpoint is %d\n", __func__, port->bulk_in_endpointAddress);
1087 mos7840_port->read_urb_busy = true;
1088 response = usb_submit_urb(mos7840_port->read_urb, GFP_KERNEL);
1089 if (response) {
1090 dev_err(&port->dev, "%s - Error %d submitting control urb\n",
1091 __func__, response);
1092 mos7840_port->read_urb_busy = false;
1093 }
1094
1095 /* initialize our port settings */
1096 /* Must set to enable ints! */
1097 mos7840_port->shadowMCR = MCR_MASTER_IE;
1098 /* send a open port command */
1099 mos7840_port->open = 1;
1100 /* mos7840_change_port_settings(mos7840_port,old_termios); */
1101
1102 return 0;
1103 err:
1104 for (j = 0; j < NUM_URBS; ++j) {
1105 urb = mos7840_port->write_urb_pool[j];
1106 if (!urb)
1107 continue;
1108 kfree(urb->transfer_buffer);
1109 usb_free_urb(urb);
1110 }
1111 return status;
1112 }
1113
1114 /*****************************************************************************
1115 * mos7840_chars_in_buffer
1116 * this function is called by the tty driver when it wants to know how many
1117 * bytes of data we currently have outstanding in the port (data that has
1118 * been written, but hasn't made it out the port yet)
1119 * If successful, we return the number of bytes left to be written in the
1120 * system,
1121 * Otherwise we return zero.
1122 *****************************************************************************/
1123
1124 static int mos7840_chars_in_buffer(struct tty_struct *tty)
1125 {
1126 struct usb_serial_port *port = tty->driver_data;
1127 int i;
1128 int chars = 0;
1129 unsigned long flags;
1130 struct moschip_port *mos7840_port;
1131
1132 if (mos7840_port_paranoia_check(port, __func__))
1133 return 0;
1134
1135 mos7840_port = mos7840_get_port_private(port);
1136 if (mos7840_port == NULL)
1137 return 0;
1138
1139 spin_lock_irqsave(&mos7840_port->pool_lock, flags);
1140 for (i = 0; i < NUM_URBS; ++i) {
1141 if (mos7840_port->busy[i]) {
1142 struct urb *urb = mos7840_port->write_urb_pool[i];
1143 chars += urb->transfer_buffer_length;
1144 }
1145 }
1146 spin_unlock_irqrestore(&mos7840_port->pool_lock, flags);
1147 dev_dbg(&port->dev, "%s - returns %d\n", __func__, chars);
1148 return chars;
1149
1150 }
1151
1152 /*****************************************************************************
1153 * mos7840_close
1154 * this function is called by the tty driver when a port is closed
1155 *****************************************************************************/
1156
1157 static void mos7840_close(struct usb_serial_port *port)
1158 {
1159 struct usb_serial *serial;
1160 struct moschip_port *mos7840_port;
1161 struct moschip_port *port0;
1162 int j;
1163 __u16 Data;
1164
1165 if (mos7840_port_paranoia_check(port, __func__))
1166 return;
1167
1168 serial = mos7840_get_usb_serial(port, __func__);
1169 if (!serial)
1170 return;
1171
1172 mos7840_port = mos7840_get_port_private(port);
1173 port0 = mos7840_get_port_private(serial->port[0]);
1174
1175 if (mos7840_port == NULL || port0 == NULL)
1176 return;
1177
1178 for (j = 0; j < NUM_URBS; ++j)
1179 usb_kill_urb(mos7840_port->write_urb_pool[j]);
1180
1181 /* Freeing Write URBs */
1182 for (j = 0; j < NUM_URBS; ++j) {
1183 if (mos7840_port->write_urb_pool[j]) {
1184 kfree(mos7840_port->write_urb_pool[j]->transfer_buffer);
1185 usb_free_urb(mos7840_port->write_urb_pool[j]);
1186 }
1187 }
1188
1189 usb_kill_urb(mos7840_port->read_urb);
1190 mos7840_port->read_urb_busy = false;
1191
1192 port0->open_ports--;
1193 dev_dbg(&port->dev, "%s in close%d\n", __func__, port0->open_ports);
1194 if (port0->open_ports == 0) {
1195 if (serial->port[0]->interrupt_in_urb) {
1196 dev_dbg(&port->dev, "Shutdown interrupt_in_urb\n");
1197 usb_kill_urb(serial->port[0]->interrupt_in_urb);
1198 }
1199 }
1200
1201 Data = 0x0;
1202 mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER, Data);
1203
1204 Data = 0x00;
1205 mos7840_set_uart_reg(port, INTERRUPT_ENABLE_REGISTER, Data);
1206
1207 mos7840_port->open = 0;
1208 }
1209
1210 /*****************************************************************************
1211 * mos7840_break
1212 * this function sends a break to the port
1213 *****************************************************************************/
1214 static void mos7840_break(struct tty_struct *tty, int break_state)
1215 {
1216 struct usb_serial_port *port = tty->driver_data;
1217 unsigned char data;
1218 struct usb_serial *serial;
1219 struct moschip_port *mos7840_port;
1220
1221 if (mos7840_port_paranoia_check(port, __func__))
1222 return;
1223
1224 serial = mos7840_get_usb_serial(port, __func__);
1225 if (!serial)
1226 return;
1227
1228 mos7840_port = mos7840_get_port_private(port);
1229
1230 if (mos7840_port == NULL)
1231 return;
1232
1233 if (break_state == -1)
1234 data = mos7840_port->shadowLCR | LCR_SET_BREAK;
1235 else
1236 data = mos7840_port->shadowLCR & ~LCR_SET_BREAK;
1237
1238 /* FIXME: no locking on shadowLCR anywhere in driver */
1239 mos7840_port->shadowLCR = data;
1240 dev_dbg(&port->dev, "%s mos7840_port->shadowLCR is %x\n", __func__, mos7840_port->shadowLCR);
1241 mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER,
1242 mos7840_port->shadowLCR);
1243 }
1244
1245 /*****************************************************************************
1246 * mos7840_write_room
1247 * this function is called by the tty driver when it wants to know how many
1248 * bytes of data we can accept for a specific port.
1249 * If successful, we return the amount of room that we have for this port
1250 * Otherwise we return a negative error number.
1251 *****************************************************************************/
1252
1253 static int mos7840_write_room(struct tty_struct *tty)
1254 {
1255 struct usb_serial_port *port = tty->driver_data;
1256 int i;
1257 int room = 0;
1258 unsigned long flags;
1259 struct moschip_port *mos7840_port;
1260
1261 if (mos7840_port_paranoia_check(port, __func__))
1262 return -1;
1263
1264 mos7840_port = mos7840_get_port_private(port);
1265 if (mos7840_port == NULL)
1266 return -1;
1267
1268 spin_lock_irqsave(&mos7840_port->pool_lock, flags);
1269 for (i = 0; i < NUM_URBS; ++i) {
1270 if (!mos7840_port->busy[i])
1271 room += URB_TRANSFER_BUFFER_SIZE;
1272 }
1273 spin_unlock_irqrestore(&mos7840_port->pool_lock, flags);
1274
1275 room = (room == 0) ? 0 : room - URB_TRANSFER_BUFFER_SIZE + 1;
1276 dev_dbg(&mos7840_port->port->dev, "%s - returns %d\n", __func__, room);
1277 return room;
1278
1279 }
1280
1281 /*****************************************************************************
1282 * mos7840_write
1283 * this function is called by the tty driver when data should be written to
1284 * the port.
1285 * If successful, we return the number of bytes written, otherwise we
1286 * return a negative error number.
1287 *****************************************************************************/
1288
1289 static int mos7840_write(struct tty_struct *tty, struct usb_serial_port *port,
1290 const unsigned char *data, int count)
1291 {
1292 int status;
1293 int i;
1294 int bytes_sent = 0;
1295 int transfer_size;
1296 unsigned long flags;
1297
1298 struct moschip_port *mos7840_port;
1299 struct usb_serial *serial;
1300 struct urb *urb;
1301 /* __u16 Data; */
1302 const unsigned char *current_position = data;
1303 unsigned char *data1;
1304
1305 if (mos7840_port_paranoia_check(port, __func__))
1306 return -1;
1307
1308 serial = port->serial;
1309 if (mos7840_serial_paranoia_check(serial, __func__))
1310 return -1;
1311
1312 mos7840_port = mos7840_get_port_private(port);
1313 if (mos7840_port == NULL)
1314 return -1;
1315
1316 /* try to find a free urb in the list */
1317 urb = NULL;
1318
1319 spin_lock_irqsave(&mos7840_port->pool_lock, flags);
1320 for (i = 0; i < NUM_URBS; ++i) {
1321 if (!mos7840_port->busy[i]) {
1322 mos7840_port->busy[i] = 1;
1323 urb = mos7840_port->write_urb_pool[i];
1324 dev_dbg(&port->dev, "URB:%d\n", i);
1325 break;
1326 }
1327 }
1328 spin_unlock_irqrestore(&mos7840_port->pool_lock, flags);
1329
1330 if (urb == NULL) {
1331 dev_dbg(&port->dev, "%s - no more free urbs\n", __func__);
1332 goto exit;
1333 }
1334
1335 if (urb->transfer_buffer == NULL) {
1336 urb->transfer_buffer = kmalloc(URB_TRANSFER_BUFFER_SIZE,
1337 GFP_ATOMIC);
1338 if (!urb->transfer_buffer)
1339 goto exit;
1340 }
1341 transfer_size = min(count, URB_TRANSFER_BUFFER_SIZE);
1342
1343 memcpy(urb->transfer_buffer, current_position, transfer_size);
1344
1345 /* fill urb with data and submit */
1346 if ((serial->num_ports == 2) && (((__u16)port->port_number % 2) != 0)) {
1347 usb_fill_bulk_urb(urb,
1348 serial->dev,
1349 usb_sndbulkpipe(serial->dev,
1350 (port->bulk_out_endpointAddress) + 2),
1351 urb->transfer_buffer,
1352 transfer_size,
1353 mos7840_bulk_out_data_callback, mos7840_port);
1354 } else {
1355 usb_fill_bulk_urb(urb,
1356 serial->dev,
1357 usb_sndbulkpipe(serial->dev,
1358 port->bulk_out_endpointAddress),
1359 urb->transfer_buffer,
1360 transfer_size,
1361 mos7840_bulk_out_data_callback, mos7840_port);
1362 }
1363
1364 data1 = urb->transfer_buffer;
1365 dev_dbg(&port->dev, "bulkout endpoint is %d\n", port->bulk_out_endpointAddress);
1366
1367 if (mos7840_port->has_led)
1368 mos7840_led_activity(port);
1369
1370 /* send it down the pipe */
1371 status = usb_submit_urb(urb, GFP_ATOMIC);
1372
1373 if (status) {
1374 mos7840_port->busy[i] = 0;
1375 dev_err_console(port, "%s - usb_submit_urb(write bulk) failed "
1376 "with status = %d\n", __func__, status);
1377 bytes_sent = status;
1378 goto exit;
1379 }
1380 bytes_sent = transfer_size;
1381 port->icount.tx += transfer_size;
1382 dev_dbg(&port->dev, "icount.tx is %d:\n", port->icount.tx);
1383 exit:
1384 return bytes_sent;
1385
1386 }
1387
1388 /*****************************************************************************
1389 * mos7840_throttle
1390 * this function is called by the tty driver when it wants to stop the data
1391 * being read from the port.
1392 *****************************************************************************/
1393
1394 static void mos7840_throttle(struct tty_struct *tty)
1395 {
1396 struct usb_serial_port *port = tty->driver_data;
1397 struct moschip_port *mos7840_port;
1398 int status;
1399
1400 if (mos7840_port_paranoia_check(port, __func__))
1401 return;
1402
1403 mos7840_port = mos7840_get_port_private(port);
1404
1405 if (mos7840_port == NULL)
1406 return;
1407
1408 if (!mos7840_port->open) {
1409 dev_dbg(&port->dev, "%s", "port not opened\n");
1410 return;
1411 }
1412
1413 /* if we are implementing XON/XOFF, send the stop character */
1414 if (I_IXOFF(tty)) {
1415 unsigned char stop_char = STOP_CHAR(tty);
1416 status = mos7840_write(tty, port, &stop_char, 1);
1417 if (status <= 0)
1418 return;
1419 }
1420 /* if we are implementing RTS/CTS, toggle that line */
1421 if (C_CRTSCTS(tty)) {
1422 mos7840_port->shadowMCR &= ~MCR_RTS;
1423 status = mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER,
1424 mos7840_port->shadowMCR);
1425 if (status < 0)
1426 return;
1427 }
1428 }
1429
1430 /*****************************************************************************
1431 * mos7840_unthrottle
1432 * this function is called by the tty driver when it wants to resume
1433 * the data being read from the port (called after mos7840_throttle is
1434 * called)
1435 *****************************************************************************/
1436 static void mos7840_unthrottle(struct tty_struct *tty)
1437 {
1438 struct usb_serial_port *port = tty->driver_data;
1439 int status;
1440 struct moschip_port *mos7840_port = mos7840_get_port_private(port);
1441
1442 if (mos7840_port_paranoia_check(port, __func__))
1443 return;
1444
1445 if (mos7840_port == NULL)
1446 return;
1447
1448 if (!mos7840_port->open) {
1449 dev_dbg(&port->dev, "%s - port not opened\n", __func__);
1450 return;
1451 }
1452
1453 /* if we are implementing XON/XOFF, send the start character */
1454 if (I_IXOFF(tty)) {
1455 unsigned char start_char = START_CHAR(tty);
1456 status = mos7840_write(tty, port, &start_char, 1);
1457 if (status <= 0)
1458 return;
1459 }
1460
1461 /* if we are implementing RTS/CTS, toggle that line */
1462 if (C_CRTSCTS(tty)) {
1463 mos7840_port->shadowMCR |= MCR_RTS;
1464 status = mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER,
1465 mos7840_port->shadowMCR);
1466 if (status < 0)
1467 return;
1468 }
1469 }
1470
1471 static int mos7840_tiocmget(struct tty_struct *tty)
1472 {
1473 struct usb_serial_port *port = tty->driver_data;
1474 struct moschip_port *mos7840_port;
1475 unsigned int result;
1476 __u16 msr;
1477 __u16 mcr;
1478 int status;
1479 mos7840_port = mos7840_get_port_private(port);
1480
1481 if (mos7840_port == NULL)
1482 return -ENODEV;
1483
1484 status = mos7840_get_uart_reg(port, MODEM_STATUS_REGISTER, &msr);
1485 if (status < 0)
1486 return -EIO;
1487 status = mos7840_get_uart_reg(port, MODEM_CONTROL_REGISTER, &mcr);
1488 if (status < 0)
1489 return -EIO;
1490 result = ((mcr & MCR_DTR) ? TIOCM_DTR : 0)
1491 | ((mcr & MCR_RTS) ? TIOCM_RTS : 0)
1492 | ((mcr & MCR_LOOPBACK) ? TIOCM_LOOP : 0)
1493 | ((msr & MOS7840_MSR_CTS) ? TIOCM_CTS : 0)
1494 | ((msr & MOS7840_MSR_CD) ? TIOCM_CAR : 0)
1495 | ((msr & MOS7840_MSR_RI) ? TIOCM_RI : 0)
1496 | ((msr & MOS7840_MSR_DSR) ? TIOCM_DSR : 0);
1497
1498 dev_dbg(&port->dev, "%s - 0x%04X\n", __func__, result);
1499
1500 return result;
1501 }
1502
1503 static int mos7840_tiocmset(struct tty_struct *tty,
1504 unsigned int set, unsigned int clear)
1505 {
1506 struct usb_serial_port *port = tty->driver_data;
1507 struct moschip_port *mos7840_port;
1508 unsigned int mcr;
1509 int status;
1510
1511 mos7840_port = mos7840_get_port_private(port);
1512
1513 if (mos7840_port == NULL)
1514 return -ENODEV;
1515
1516 /* FIXME: What locks the port registers ? */
1517 mcr = mos7840_port->shadowMCR;
1518 if (clear & TIOCM_RTS)
1519 mcr &= ~MCR_RTS;
1520 if (clear & TIOCM_DTR)
1521 mcr &= ~MCR_DTR;
1522 if (clear & TIOCM_LOOP)
1523 mcr &= ~MCR_LOOPBACK;
1524
1525 if (set & TIOCM_RTS)
1526 mcr |= MCR_RTS;
1527 if (set & TIOCM_DTR)
1528 mcr |= MCR_DTR;
1529 if (set & TIOCM_LOOP)
1530 mcr |= MCR_LOOPBACK;
1531
1532 mos7840_port->shadowMCR = mcr;
1533
1534 status = mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER, mcr);
1535 if (status < 0) {
1536 dev_dbg(&port->dev, "setting MODEM_CONTROL_REGISTER Failed\n");
1537 return status;
1538 }
1539
1540 return 0;
1541 }
1542
1543 /*****************************************************************************
1544 * mos7840_calc_baud_rate_divisor
1545 * this function calculates the proper baud rate divisor for the specified
1546 * baud rate.
1547 *****************************************************************************/
1548 static int mos7840_calc_baud_rate_divisor(struct usb_serial_port *port,
1549 int baudRate, int *divisor,
1550 __u16 *clk_sel_val)
1551 {
1552 dev_dbg(&port->dev, "%s - %d\n", __func__, baudRate);
1553
1554 if (baudRate <= 115200) {
1555 *divisor = 115200 / baudRate;
1556 *clk_sel_val = 0x0;
1557 }
1558 if ((baudRate > 115200) && (baudRate <= 230400)) {
1559 *divisor = 230400 / baudRate;
1560 *clk_sel_val = 0x10;
1561 } else if ((baudRate > 230400) && (baudRate <= 403200)) {
1562 *divisor = 403200 / baudRate;
1563 *clk_sel_val = 0x20;
1564 } else if ((baudRate > 403200) && (baudRate <= 460800)) {
1565 *divisor = 460800 / baudRate;
1566 *clk_sel_val = 0x30;
1567 } else if ((baudRate > 460800) && (baudRate <= 806400)) {
1568 *divisor = 806400 / baudRate;
1569 *clk_sel_val = 0x40;
1570 } else if ((baudRate > 806400) && (baudRate <= 921600)) {
1571 *divisor = 921600 / baudRate;
1572 *clk_sel_val = 0x50;
1573 } else if ((baudRate > 921600) && (baudRate <= 1572864)) {
1574 *divisor = 1572864 / baudRate;
1575 *clk_sel_val = 0x60;
1576 } else if ((baudRate > 1572864) && (baudRate <= 3145728)) {
1577 *divisor = 3145728 / baudRate;
1578 *clk_sel_val = 0x70;
1579 }
1580 return 0;
1581 }
1582
1583 /*****************************************************************************
1584 * mos7840_send_cmd_write_baud_rate
1585 * this function sends the proper command to change the baud rate of the
1586 * specified port.
1587 *****************************************************************************/
1588
1589 static int mos7840_send_cmd_write_baud_rate(struct moschip_port *mos7840_port,
1590 int baudRate)
1591 {
1592 int divisor = 0;
1593 int status;
1594 __u16 Data;
1595 unsigned char number;
1596 __u16 clk_sel_val;
1597 struct usb_serial_port *port;
1598
1599 if (mos7840_port == NULL)
1600 return -1;
1601
1602 port = mos7840_port->port;
1603 if (mos7840_port_paranoia_check(port, __func__))
1604 return -1;
1605
1606 if (mos7840_serial_paranoia_check(port->serial, __func__))
1607 return -1;
1608
1609 number = mos7840_port->port->port_number;
1610
1611 dev_dbg(&port->dev, "%s - baud = %d\n", __func__, baudRate);
1612 /* reset clk_uart_sel in spregOffset */
1613 if (baudRate > 115200) {
1614 #ifdef HW_flow_control
1615 /* NOTE: need to see the pther register to modify */
1616 /* setting h/w flow control bit to 1 */
1617 Data = 0x2b;
1618 mos7840_port->shadowMCR = Data;
1619 status = mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER,
1620 Data);
1621 if (status < 0) {
1622 dev_dbg(&port->dev, "Writing spreg failed in set_serial_baud\n");
1623 return -1;
1624 }
1625 #endif
1626
1627 } else {
1628 #ifdef HW_flow_control
1629 /* setting h/w flow control bit to 0 */
1630 Data = 0xb;
1631 mos7840_port->shadowMCR = Data;
1632 status = mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER,
1633 Data);
1634 if (status < 0) {
1635 dev_dbg(&port->dev, "Writing spreg failed in set_serial_baud\n");
1636 return -1;
1637 }
1638 #endif
1639
1640 }
1641
1642 if (1) { /* baudRate <= 115200) */
1643 clk_sel_val = 0x0;
1644 Data = 0x0;
1645 status = mos7840_calc_baud_rate_divisor(port, baudRate, &divisor,
1646 &clk_sel_val);
1647 status = mos7840_get_reg_sync(port, mos7840_port->SpRegOffset,
1648 &Data);
1649 if (status < 0) {
1650 dev_dbg(&port->dev, "reading spreg failed in set_serial_baud\n");
1651 return -1;
1652 }
1653 Data = (Data & 0x8f) | clk_sel_val;
1654 status = mos7840_set_reg_sync(port, mos7840_port->SpRegOffset,
1655 Data);
1656 if (status < 0) {
1657 dev_dbg(&port->dev, "Writing spreg failed in set_serial_baud\n");
1658 return -1;
1659 }
1660 /* Calculate the Divisor */
1661
1662 if (status) {
1663 dev_err(&port->dev, "%s - bad baud rate\n", __func__);
1664 return status;
1665 }
1666 /* Enable access to divisor latch */
1667 Data = mos7840_port->shadowLCR | SERIAL_LCR_DLAB;
1668 mos7840_port->shadowLCR = Data;
1669 mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data);
1670
1671 /* Write the divisor */
1672 Data = (unsigned char)(divisor & 0xff);
1673 dev_dbg(&port->dev, "set_serial_baud Value to write DLL is %x\n", Data);
1674 mos7840_set_uart_reg(port, DIVISOR_LATCH_LSB, Data);
1675
1676 Data = (unsigned char)((divisor & 0xff00) >> 8);
1677 dev_dbg(&port->dev, "set_serial_baud Value to write DLM is %x\n", Data);
1678 mos7840_set_uart_reg(port, DIVISOR_LATCH_MSB, Data);
1679
1680 /* Disable access to divisor latch */
1681 Data = mos7840_port->shadowLCR & ~SERIAL_LCR_DLAB;
1682 mos7840_port->shadowLCR = Data;
1683 mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data);
1684
1685 }
1686 return status;
1687 }
1688
1689 /*****************************************************************************
1690 * mos7840_change_port_settings
1691 * This routine is called to set the UART on the device to match
1692 * the specified new settings.
1693 *****************************************************************************/
1694
1695 static void mos7840_change_port_settings(struct tty_struct *tty,
1696 struct moschip_port *mos7840_port, struct ktermios *old_termios)
1697 {
1698 int baud;
1699 unsigned cflag;
1700 unsigned iflag;
1701 __u8 lData;
1702 __u8 lParity;
1703 __u8 lStop;
1704 int status;
1705 __u16 Data;
1706 struct usb_serial_port *port;
1707 struct usb_serial *serial;
1708
1709 if (mos7840_port == NULL)
1710 return;
1711
1712 port = mos7840_port->port;
1713
1714 if (mos7840_port_paranoia_check(port, __func__))
1715 return;
1716
1717 if (mos7840_serial_paranoia_check(port->serial, __func__))
1718 return;
1719
1720 serial = port->serial;
1721
1722 if (!mos7840_port->open) {
1723 dev_dbg(&port->dev, "%s - port not opened\n", __func__);
1724 return;
1725 }
1726
1727 lData = LCR_BITS_8;
1728 lStop = LCR_STOP_1;
1729 lParity = LCR_PAR_NONE;
1730
1731 cflag = tty->termios.c_cflag;
1732 iflag = tty->termios.c_iflag;
1733
1734 /* Change the number of bits */
1735 switch (cflag & CSIZE) {
1736 case CS5:
1737 lData = LCR_BITS_5;
1738 break;
1739
1740 case CS6:
1741 lData = LCR_BITS_6;
1742 break;
1743
1744 case CS7:
1745 lData = LCR_BITS_7;
1746 break;
1747
1748 default:
1749 case CS8:
1750 lData = LCR_BITS_8;
1751 break;
1752 }
1753
1754 /* Change the Parity bit */
1755 if (cflag & PARENB) {
1756 if (cflag & PARODD) {
1757 lParity = LCR_PAR_ODD;
1758 dev_dbg(&port->dev, "%s - parity = odd\n", __func__);
1759 } else {
1760 lParity = LCR_PAR_EVEN;
1761 dev_dbg(&port->dev, "%s - parity = even\n", __func__);
1762 }
1763
1764 } else {
1765 dev_dbg(&port->dev, "%s - parity = none\n", __func__);
1766 }
1767
1768 if (cflag & CMSPAR)
1769 lParity = lParity | 0x20;
1770
1771 /* Change the Stop bit */
1772 if (cflag & CSTOPB) {
1773 lStop = LCR_STOP_2;
1774 dev_dbg(&port->dev, "%s - stop bits = 2\n", __func__);
1775 } else {
1776 lStop = LCR_STOP_1;
1777 dev_dbg(&port->dev, "%s - stop bits = 1\n", __func__);
1778 }
1779
1780 /* Update the LCR with the correct value */
1781 mos7840_port->shadowLCR &=
1782 ~(LCR_BITS_MASK | LCR_STOP_MASK | LCR_PAR_MASK);
1783 mos7840_port->shadowLCR |= (lData | lParity | lStop);
1784
1785 dev_dbg(&port->dev, "%s - mos7840_port->shadowLCR is %x\n", __func__,
1786 mos7840_port->shadowLCR);
1787 /* Disable Interrupts */
1788 Data = 0x00;
1789 mos7840_set_uart_reg(port, INTERRUPT_ENABLE_REGISTER, Data);
1790
1791 Data = 0x00;
1792 mos7840_set_uart_reg(port, FIFO_CONTROL_REGISTER, Data);
1793
1794 Data = 0xcf;
1795 mos7840_set_uart_reg(port, FIFO_CONTROL_REGISTER, Data);
1796
1797 /* Send the updated LCR value to the mos7840 */
1798 Data = mos7840_port->shadowLCR;
1799
1800 mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data);
1801
1802 Data = 0x00b;
1803 mos7840_port->shadowMCR = Data;
1804 mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER, Data);
1805 Data = 0x00b;
1806 mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER, Data);
1807
1808 /* set up the MCR register and send it to the mos7840 */
1809
1810 mos7840_port->shadowMCR = MCR_MASTER_IE;
1811 if (cflag & CBAUD)
1812 mos7840_port->shadowMCR |= (MCR_DTR | MCR_RTS);
1813
1814 if (cflag & CRTSCTS)
1815 mos7840_port->shadowMCR |= (MCR_XON_ANY);
1816 else
1817 mos7840_port->shadowMCR &= ~(MCR_XON_ANY);
1818
1819 Data = mos7840_port->shadowMCR;
1820 mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER, Data);
1821
1822 /* Determine divisor based on baud rate */
1823 baud = tty_get_baud_rate(tty);
1824
1825 if (!baud) {
1826 /* pick a default, any default... */
1827 dev_dbg(&port->dev, "%s", "Picked default baud...\n");
1828 baud = 9600;
1829 }
1830
1831 dev_dbg(&port->dev, "%s - baud rate = %d\n", __func__, baud);
1832 status = mos7840_send_cmd_write_baud_rate(mos7840_port, baud);
1833
1834 /* Enable Interrupts */
1835 Data = 0x0c;
1836 mos7840_set_uart_reg(port, INTERRUPT_ENABLE_REGISTER, Data);
1837
1838 if (!mos7840_port->read_urb_busy) {
1839 mos7840_port->read_urb_busy = true;
1840 status = usb_submit_urb(mos7840_port->read_urb, GFP_KERNEL);
1841 if (status) {
1842 dev_dbg(&port->dev, "usb_submit_urb(read bulk) failed, status = %d\n",
1843 status);
1844 mos7840_port->read_urb_busy = false;
1845 }
1846 }
1847 dev_dbg(&port->dev, "%s - mos7840_port->shadowLCR is End %x\n", __func__,
1848 mos7840_port->shadowLCR);
1849 }
1850
1851 /*****************************************************************************
1852 * mos7840_set_termios
1853 * this function is called by the tty driver when it wants to change
1854 * the termios structure
1855 *****************************************************************************/
1856
1857 static void mos7840_set_termios(struct tty_struct *tty,
1858 struct usb_serial_port *port,
1859 struct ktermios *old_termios)
1860 {
1861 int status;
1862 struct usb_serial *serial;
1863 struct moschip_port *mos7840_port;
1864
1865 if (mos7840_port_paranoia_check(port, __func__))
1866 return;
1867
1868 serial = port->serial;
1869
1870 if (mos7840_serial_paranoia_check(serial, __func__))
1871 return;
1872
1873 mos7840_port = mos7840_get_port_private(port);
1874
1875 if (mos7840_port == NULL)
1876 return;
1877
1878 if (!mos7840_port->open) {
1879 dev_dbg(&port->dev, "%s - port not opened\n", __func__);
1880 return;
1881 }
1882
1883 /* change the port settings to the new ones specified */
1884
1885 mos7840_change_port_settings(tty, mos7840_port, old_termios);
1886
1887 if (!mos7840_port->read_urb) {
1888 dev_dbg(&port->dev, "%s", "URB KILLED !!!!!\n");
1889 return;
1890 }
1891
1892 if (!mos7840_port->read_urb_busy) {
1893 mos7840_port->read_urb_busy = true;
1894 status = usb_submit_urb(mos7840_port->read_urb, GFP_KERNEL);
1895 if (status) {
1896 dev_dbg(&port->dev, "usb_submit_urb(read bulk) failed, status = %d\n",
1897 status);
1898 mos7840_port->read_urb_busy = false;
1899 }
1900 }
1901 }
1902
1903 /*****************************************************************************
1904 * mos7840_get_lsr_info - get line status register info
1905 *
1906 * Purpose: Let user call ioctl() to get info when the UART physically
1907 * is emptied. On bus types like RS485, the transmitter must
1908 * release the bus after transmitting. This must be done when
1909 * the transmit shift register is empty, not be done when the
1910 * transmit holding register is empty. This functionality
1911 * allows an RS485 driver to be written in user space.
1912 *****************************************************************************/
1913
1914 static int mos7840_get_lsr_info(struct tty_struct *tty,
1915 unsigned int __user *value)
1916 {
1917 int count;
1918 unsigned int result = 0;
1919
1920 count = mos7840_chars_in_buffer(tty);
1921 if (count == 0)
1922 result = TIOCSER_TEMT;
1923
1924 if (copy_to_user(value, &result, sizeof(int)))
1925 return -EFAULT;
1926 return 0;
1927 }
1928
1929 /*****************************************************************************
1930 * mos7840_get_serial_info
1931 * function to get information about serial port
1932 *****************************************************************************/
1933
1934 static int mos7840_get_serial_info(struct moschip_port *mos7840_port,
1935 struct serial_struct __user *retinfo)
1936 {
1937 struct serial_struct tmp;
1938
1939 if (mos7840_port == NULL)
1940 return -1;
1941
1942 memset(&tmp, 0, sizeof(tmp));
1943
1944 tmp.type = PORT_16550A;
1945 tmp.line = mos7840_port->port->minor;
1946 tmp.port = mos7840_port->port->port_number;
1947 tmp.irq = 0;
1948 tmp.xmit_fifo_size = NUM_URBS * URB_TRANSFER_BUFFER_SIZE;
1949 tmp.baud_base = 9600;
1950 tmp.close_delay = 5 * HZ;
1951 tmp.closing_wait = 30 * HZ;
1952
1953 if (copy_to_user(retinfo, &tmp, sizeof(*retinfo)))
1954 return -EFAULT;
1955 return 0;
1956 }
1957
1958 /*****************************************************************************
1959 * SerialIoctl
1960 * this function handles any ioctl calls to the driver
1961 *****************************************************************************/
1962
1963 static int mos7840_ioctl(struct tty_struct *tty,
1964 unsigned int cmd, unsigned long arg)
1965 {
1966 struct usb_serial_port *port = tty->driver_data;
1967 void __user *argp = (void __user *)arg;
1968 struct moschip_port *mos7840_port;
1969
1970 if (mos7840_port_paranoia_check(port, __func__))
1971 return -1;
1972
1973 mos7840_port = mos7840_get_port_private(port);
1974
1975 if (mos7840_port == NULL)
1976 return -1;
1977
1978 switch (cmd) {
1979 /* return number of bytes available */
1980
1981 case TIOCSERGETLSR:
1982 dev_dbg(&port->dev, "%s TIOCSERGETLSR\n", __func__);
1983 return mos7840_get_lsr_info(tty, argp);
1984
1985 case TIOCGSERIAL:
1986 dev_dbg(&port->dev, "%s TIOCGSERIAL\n", __func__);
1987 return mos7840_get_serial_info(mos7840_port, argp);
1988
1989 case TIOCSSERIAL:
1990 dev_dbg(&port->dev, "%s TIOCSSERIAL\n", __func__);
1991 break;
1992 default:
1993 break;
1994 }
1995 return -ENOIOCTLCMD;
1996 }
1997
1998 static int mos7810_check(struct usb_serial *serial)
1999 {
2000 int i, pass_count = 0;
2001 u8 *buf;
2002 __u16 data = 0, mcr_data = 0;
2003 __u16 test_pattern = 0x55AA;
2004 int res;
2005
2006 buf = kmalloc(VENDOR_READ_LENGTH, GFP_KERNEL);
2007 if (!buf)
2008 return 0; /* failed to identify 7810 */
2009
2010 /* Store MCR setting */
2011 res = usb_control_msg(serial->dev, usb_rcvctrlpipe(serial->dev, 0),
2012 MCS_RDREQ, MCS_RD_RTYPE, 0x0300, MODEM_CONTROL_REGISTER,
2013 buf, VENDOR_READ_LENGTH, MOS_WDR_TIMEOUT);
2014 if (res == VENDOR_READ_LENGTH)
2015 mcr_data = *buf;
2016
2017 for (i = 0; i < 16; i++) {
2018 /* Send the 1-bit test pattern out to MCS7810 test pin */
2019 usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0),
2020 MCS_WRREQ, MCS_WR_RTYPE,
2021 (0x0300 | (((test_pattern >> i) & 0x0001) << 1)),
2022 MODEM_CONTROL_REGISTER, NULL, 0, MOS_WDR_TIMEOUT);
2023
2024 /* Read the test pattern back */
2025 res = usb_control_msg(serial->dev,
2026 usb_rcvctrlpipe(serial->dev, 0), MCS_RDREQ,
2027 MCS_RD_RTYPE, 0, GPIO_REGISTER, buf,
2028 VENDOR_READ_LENGTH, MOS_WDR_TIMEOUT);
2029 if (res == VENDOR_READ_LENGTH)
2030 data = *buf;
2031
2032 /* If this is a MCS7810 device, both test patterns must match */
2033 if (((test_pattern >> i) ^ (~data >> 1)) & 0x0001)
2034 break;
2035
2036 pass_count++;
2037 }
2038
2039 /* Restore MCR setting */
2040 usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0), MCS_WRREQ,
2041 MCS_WR_RTYPE, 0x0300 | mcr_data, MODEM_CONTROL_REGISTER, NULL,
2042 0, MOS_WDR_TIMEOUT);
2043
2044 kfree(buf);
2045
2046 if (pass_count == 16)
2047 return 1;
2048
2049 return 0;
2050 }
2051
2052 static int mos7840_probe(struct usb_serial *serial,
2053 const struct usb_device_id *id)
2054 {
2055 u16 product = le16_to_cpu(serial->dev->descriptor.idProduct);
2056 u8 *buf;
2057 int device_type;
2058
2059 if (product == MOSCHIP_DEVICE_ID_7810 ||
2060 product == MOSCHIP_DEVICE_ID_7820) {
2061 device_type = product;
2062 goto out;
2063 }
2064
2065 buf = kzalloc(VENDOR_READ_LENGTH, GFP_KERNEL);
2066 if (!buf)
2067 return -ENOMEM;
2068
2069 usb_control_msg(serial->dev, usb_rcvctrlpipe(serial->dev, 0),
2070 MCS_RDREQ, MCS_RD_RTYPE, 0, GPIO_REGISTER, buf,
2071 VENDOR_READ_LENGTH, MOS_WDR_TIMEOUT);
2072
2073 /* For a MCS7840 device GPIO0 must be set to 1 */
2074 if (buf[0] & 0x01)
2075 device_type = MOSCHIP_DEVICE_ID_7840;
2076 else if (mos7810_check(serial))
2077 device_type = MOSCHIP_DEVICE_ID_7810;
2078 else
2079 device_type = MOSCHIP_DEVICE_ID_7820;
2080
2081 kfree(buf);
2082 out:
2083 usb_set_serial_data(serial, (void *)(unsigned long)device_type);
2084
2085 return 0;
2086 }
2087
2088 static int mos7840_calc_num_ports(struct usb_serial *serial,
2089 struct usb_serial_endpoints *epds)
2090 {
2091 int device_type = (unsigned long)usb_get_serial_data(serial);
2092 int num_ports;
2093
2094 num_ports = (device_type >> 4) & 0x000F;
2095
2096 /*
2097 * num_ports is currently never zero as device_type is one of
2098 * MOSCHIP_DEVICE_ID_78{1,2,4}0.
2099 */
2100 if (num_ports == 0)
2101 return -ENODEV;
2102
2103 if (epds->num_bulk_in < num_ports || epds->num_bulk_out < num_ports) {
2104 dev_err(&serial->interface->dev, "missing endpoints\n");
2105 return -ENODEV;
2106 }
2107
2108 return num_ports;
2109 }
2110
2111 static int mos7840_port_probe(struct usb_serial_port *port)
2112 {
2113 struct usb_serial *serial = port->serial;
2114 int device_type = (unsigned long)usb_get_serial_data(serial);
2115 struct moschip_port *mos7840_port;
2116 int status;
2117 int pnum;
2118 __u16 Data;
2119
2120 /* we set up the pointers to the endpoints in the mos7840_open *
2121 * function, as the structures aren't created yet. */
2122
2123 pnum = port->port_number;
2124
2125 dev_dbg(&port->dev, "mos7840_startup: configuring port %d\n", pnum);
2126 mos7840_port = kzalloc(sizeof(struct moschip_port), GFP_KERNEL);
2127 if (!mos7840_port)
2128 return -ENOMEM;
2129
2130 /* Initialize all port interrupt end point to port 0 int
2131 * endpoint. Our device has only one interrupt end point
2132 * common to all port */
2133
2134 mos7840_port->port = port;
2135 mos7840_set_port_private(port, mos7840_port);
2136 spin_lock_init(&mos7840_port->pool_lock);
2137
2138 /* minor is not initialised until later by
2139 * usb-serial.c:get_free_serial() and cannot therefore be used
2140 * to index device instances */
2141 mos7840_port->port_num = pnum + 1;
2142 dev_dbg(&port->dev, "port->minor = %d\n", port->minor);
2143 dev_dbg(&port->dev, "mos7840_port->port_num = %d\n", mos7840_port->port_num);
2144
2145 if (mos7840_port->port_num == 1) {
2146 mos7840_port->SpRegOffset = 0x0;
2147 mos7840_port->ControlRegOffset = 0x1;
2148 mos7840_port->DcrRegOffset = 0x4;
2149 } else if ((mos7840_port->port_num == 2) && (serial->num_ports == 4)) {
2150 mos7840_port->SpRegOffset = 0x8;
2151 mos7840_port->ControlRegOffset = 0x9;
2152 mos7840_port->DcrRegOffset = 0x16;
2153 } else if ((mos7840_port->port_num == 2) && (serial->num_ports == 2)) {
2154 mos7840_port->SpRegOffset = 0xa;
2155 mos7840_port->ControlRegOffset = 0xb;
2156 mos7840_port->DcrRegOffset = 0x19;
2157 } else if ((mos7840_port->port_num == 3) && (serial->num_ports == 4)) {
2158 mos7840_port->SpRegOffset = 0xa;
2159 mos7840_port->ControlRegOffset = 0xb;
2160 mos7840_port->DcrRegOffset = 0x19;
2161 } else if ((mos7840_port->port_num == 4) && (serial->num_ports == 4)) {
2162 mos7840_port->SpRegOffset = 0xc;
2163 mos7840_port->ControlRegOffset = 0xd;
2164 mos7840_port->DcrRegOffset = 0x1c;
2165 }
2166 mos7840_dump_serial_port(port, mos7840_port);
2167 mos7840_set_port_private(port, mos7840_port);
2168
2169 /* enable rx_disable bit in control register */
2170 status = mos7840_get_reg_sync(port,
2171 mos7840_port->ControlRegOffset, &Data);
2172 if (status < 0) {
2173 dev_dbg(&port->dev, "Reading ControlReg failed status-0x%x\n", status);
2174 goto out;
2175 } else
2176 dev_dbg(&port->dev, "ControlReg Reading success val is %x, status%d\n", Data, status);
2177 Data |= 0x08; /* setting driver done bit */
2178 Data |= 0x04; /* sp1_bit to have cts change reflect in
2179 modem status reg */
2180
2181 /* Data |= 0x20; //rx_disable bit */
2182 status = mos7840_set_reg_sync(port,
2183 mos7840_port->ControlRegOffset, Data);
2184 if (status < 0) {
2185 dev_dbg(&port->dev, "Writing ControlReg failed(rx_disable) status-0x%x\n", status);
2186 goto out;
2187 } else
2188 dev_dbg(&port->dev, "ControlReg Writing success(rx_disable) status%d\n", status);
2189
2190 /* Write default values in DCR (i.e 0x01 in DCR0, 0x05 in DCR2
2191 and 0x24 in DCR3 */
2192 Data = 0x01;
2193 status = mos7840_set_reg_sync(port,
2194 (__u16) (mos7840_port->DcrRegOffset + 0), Data);
2195 if (status < 0) {
2196 dev_dbg(&port->dev, "Writing DCR0 failed status-0x%x\n", status);
2197 goto out;
2198 } else
2199 dev_dbg(&port->dev, "DCR0 Writing success status%d\n", status);
2200
2201 Data = 0x05;
2202 status = mos7840_set_reg_sync(port,
2203 (__u16) (mos7840_port->DcrRegOffset + 1), Data);
2204 if (status < 0) {
2205 dev_dbg(&port->dev, "Writing DCR1 failed status-0x%x\n", status);
2206 goto out;
2207 } else
2208 dev_dbg(&port->dev, "DCR1 Writing success status%d\n", status);
2209
2210 Data = 0x24;
2211 status = mos7840_set_reg_sync(port,
2212 (__u16) (mos7840_port->DcrRegOffset + 2), Data);
2213 if (status < 0) {
2214 dev_dbg(&port->dev, "Writing DCR2 failed status-0x%x\n", status);
2215 goto out;
2216 } else
2217 dev_dbg(&port->dev, "DCR2 Writing success status%d\n", status);
2218
2219 /* write values in clkstart0x0 and clkmulti 0x20 */
2220 Data = 0x0;
2221 status = mos7840_set_reg_sync(port, CLK_START_VALUE_REGISTER, Data);
2222 if (status < 0) {
2223 dev_dbg(&port->dev, "Writing CLK_START_VALUE_REGISTER failed status-0x%x\n", status);
2224 goto out;
2225 } else
2226 dev_dbg(&port->dev, "CLK_START_VALUE_REGISTER Writing success status%d\n", status);
2227
2228 Data = 0x20;
2229 status = mos7840_set_reg_sync(port, CLK_MULTI_REGISTER, Data);
2230 if (status < 0) {
2231 dev_dbg(&port->dev, "Writing CLK_MULTI_REGISTER failed status-0x%x\n", status);
2232 goto error;
2233 } else
2234 dev_dbg(&port->dev, "CLK_MULTI_REGISTER Writing success status%d\n", status);
2235
2236 /* write value 0x0 to scratchpad register */
2237 Data = 0x00;
2238 status = mos7840_set_uart_reg(port, SCRATCH_PAD_REGISTER, Data);
2239 if (status < 0) {
2240 dev_dbg(&port->dev, "Writing SCRATCH_PAD_REGISTER failed status-0x%x\n", status);
2241 goto out;
2242 } else
2243 dev_dbg(&port->dev, "SCRATCH_PAD_REGISTER Writing success status%d\n", status);
2244
2245 /* Zero Length flag register */
2246 if ((mos7840_port->port_num != 1) && (serial->num_ports == 2)) {
2247 Data = 0xff;
2248 status = mos7840_set_reg_sync(port,
2249 (__u16) (ZLP_REG1 +
2250 ((__u16)mos7840_port->port_num)), Data);
2251 dev_dbg(&port->dev, "ZLIP offset %x\n",
2252 (__u16)(ZLP_REG1 + ((__u16) mos7840_port->port_num)));
2253 if (status < 0) {
2254 dev_dbg(&port->dev, "Writing ZLP_REG%d failed status-0x%x\n", pnum + 2, status);
2255 goto out;
2256 } else
2257 dev_dbg(&port->dev, "ZLP_REG%d Writing success status%d\n", pnum + 2, status);
2258 } else {
2259 Data = 0xff;
2260 status = mos7840_set_reg_sync(port,
2261 (__u16) (ZLP_REG1 +
2262 ((__u16)mos7840_port->port_num) - 0x1), Data);
2263 dev_dbg(&port->dev, "ZLIP offset %x\n",
2264 (__u16)(ZLP_REG1 + ((__u16) mos7840_port->port_num) - 0x1));
2265 if (status < 0) {
2266 dev_dbg(&port->dev, "Writing ZLP_REG%d failed status-0x%x\n", pnum + 1, status);
2267 goto out;
2268 } else
2269 dev_dbg(&port->dev, "ZLP_REG%d Writing success status%d\n", pnum + 1, status);
2270
2271 }
2272 mos7840_port->control_urb = usb_alloc_urb(0, GFP_KERNEL);
2273 mos7840_port->ctrl_buf = kmalloc(16, GFP_KERNEL);
2274 mos7840_port->dr = kmalloc(sizeof(struct usb_ctrlrequest),
2275 GFP_KERNEL);
2276 if (!mos7840_port->control_urb || !mos7840_port->ctrl_buf ||
2277 !mos7840_port->dr) {
2278 status = -ENOMEM;
2279 goto error;
2280 }
2281
2282 mos7840_port->has_led = false;
2283
2284 /* Initialize LED timers */
2285 if (device_type == MOSCHIP_DEVICE_ID_7810) {
2286 mos7840_port->has_led = true;
2287
2288 mos7840_port->led_urb = usb_alloc_urb(0, GFP_KERNEL);
2289 mos7840_port->led_dr = kmalloc(sizeof(*mos7840_port->led_dr),
2290 GFP_KERNEL);
2291 if (!mos7840_port->led_urb || !mos7840_port->led_dr) {
2292 status = -ENOMEM;
2293 goto error;
2294 }
2295
2296 timer_setup(&mos7840_port->led_timer1, mos7840_led_off, 0);
2297 mos7840_port->led_timer1.expires =
2298 jiffies + msecs_to_jiffies(LED_ON_MS);
2299 timer_setup(&mos7840_port->led_timer2, mos7840_led_flag_off,
2300 0);
2301 mos7840_port->led_timer2.expires =
2302 jiffies + msecs_to_jiffies(LED_OFF_MS);
2303
2304 /* Turn off LED */
2305 mos7840_set_led_sync(port, MODEM_CONTROL_REGISTER, 0x0300);
2306 }
2307 out:
2308 if (pnum == serial->num_ports - 1) {
2309 /* Zero Length flag enable */
2310 Data = 0x0f;
2311 status = mos7840_set_reg_sync(serial->port[0], ZLP_REG5, Data);
2312 if (status < 0) {
2313 dev_dbg(&port->dev, "Writing ZLP_REG5 failed status-0x%x\n", status);
2314 goto error;
2315 } else
2316 dev_dbg(&port->dev, "ZLP_REG5 Writing success status%d\n", status);
2317
2318 /* setting configuration feature to one */
2319 usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0),
2320 0x03, 0x00, 0x01, 0x00, NULL, 0x00,
2321 MOS_WDR_TIMEOUT);
2322 }
2323 return 0;
2324 error:
2325 kfree(mos7840_port->led_dr);
2326 usb_free_urb(mos7840_port->led_urb);
2327 kfree(mos7840_port->dr);
2328 kfree(mos7840_port->ctrl_buf);
2329 usb_free_urb(mos7840_port->control_urb);
2330 kfree(mos7840_port);
2331
2332 return status;
2333 }
2334
2335 static int mos7840_port_remove(struct usb_serial_port *port)
2336 {
2337 struct moschip_port *mos7840_port;
2338
2339 mos7840_port = mos7840_get_port_private(port);
2340
2341 if (mos7840_port->has_led) {
2342 /* Turn off LED */
2343 mos7840_set_led_sync(port, MODEM_CONTROL_REGISTER, 0x0300);
2344
2345 del_timer_sync(&mos7840_port->led_timer1);
2346 del_timer_sync(&mos7840_port->led_timer2);
2347
2348 usb_kill_urb(mos7840_port->led_urb);
2349 usb_free_urb(mos7840_port->led_urb);
2350 kfree(mos7840_port->led_dr);
2351 }
2352 usb_kill_urb(mos7840_port->control_urb);
2353 usb_free_urb(mos7840_port->control_urb);
2354 kfree(mos7840_port->ctrl_buf);
2355 kfree(mos7840_port->dr);
2356 kfree(mos7840_port);
2357
2358 return 0;
2359 }
2360
2361 static struct usb_serial_driver moschip7840_4port_device = {
2362 .driver = {
2363 .owner = THIS_MODULE,
2364 .name = "mos7840",
2365 },
2366 .description = DRIVER_DESC,
2367 .id_table = id_table,
2368 .num_interrupt_in = 1,
2369 .open = mos7840_open,
2370 .close = mos7840_close,
2371 .write = mos7840_write,
2372 .write_room = mos7840_write_room,
2373 .chars_in_buffer = mos7840_chars_in_buffer,
2374 .throttle = mos7840_throttle,
2375 .unthrottle = mos7840_unthrottle,
2376 .calc_num_ports = mos7840_calc_num_ports,
2377 .probe = mos7840_probe,
2378 .ioctl = mos7840_ioctl,
2379 .set_termios = mos7840_set_termios,
2380 .break_ctl = mos7840_break,
2381 .tiocmget = mos7840_tiocmget,
2382 .tiocmset = mos7840_tiocmset,
2383 .tiocmiwait = usb_serial_generic_tiocmiwait,
2384 .get_icount = usb_serial_generic_get_icount,
2385 .port_probe = mos7840_port_probe,
2386 .port_remove = mos7840_port_remove,
2387 .read_bulk_callback = mos7840_bulk_in_callback,
2388 .read_int_callback = mos7840_interrupt_callback,
2389 };
2390
2391 static struct usb_serial_driver * const serial_drivers[] = {
2392 &moschip7840_4port_device, NULL
2393 };
2394
2395 module_usb_serial_driver(serial_drivers, id_table);
2396
2397 MODULE_DESCRIPTION(DRIVER_DESC);
2398 MODULE_LICENSE("GPL");
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