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