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_7843 0x7843
98 #define MOSCHIP_DEVICE_ID_7820 0x7820
99 #define MOSCHIP_DEVICE_ID_7810 0x7810
100 /* The native component can have its vendor/device id's overridden
101 * in vendor-specific implementations. Such devices can be handled
102 * by making a change here, in id_table.
103 */
104 #define USB_VENDOR_ID_BANDB 0x0856
105 #define BANDB_DEVICE_ID_USO9ML2_2 0xAC22
106 #define BANDB_DEVICE_ID_USO9ML2_2P 0xBC00
107 #define BANDB_DEVICE_ID_USO9ML2_4 0xAC24
108 #define BANDB_DEVICE_ID_USO9ML2_4P 0xBC01
109 #define BANDB_DEVICE_ID_US9ML2_2 0xAC29
110 #define BANDB_DEVICE_ID_US9ML2_4 0xAC30
111 #define BANDB_DEVICE_ID_USPTL4_2 0xAC31
112 #define BANDB_DEVICE_ID_USPTL4_4 0xAC32
113 #define BANDB_DEVICE_ID_USOPTL4_2 0xAC42
114 #define BANDB_DEVICE_ID_USOPTL4_2P 0xBC02
115 #define BANDB_DEVICE_ID_USOPTL4_4 0xAC44
116 #define BANDB_DEVICE_ID_USOPTL4_4P 0xBC03
117 #define BANDB_DEVICE_ID_USOPTL2_4 0xAC24
118
119 /* This driver also supports
120 * ATEN UC2324 device using Moschip MCS7840
121 * ATEN UC2322 device using Moschip MCS7820
122 */
123 #define USB_VENDOR_ID_ATENINTL 0x0557
124 #define ATENINTL_DEVICE_ID_UC2324 0x2011
125 #define ATENINTL_DEVICE_ID_UC2322 0x7820
126
127 /* Interrupt Routine Defines */
128
129 #define SERIAL_IIR_RLS 0x06
130 #define SERIAL_IIR_MS 0x00
131
132 /*
133 * Emulation of the bit mask on the LINE STATUS REGISTER.
134 */
135 #define SERIAL_LSR_DR 0x0001
136 #define SERIAL_LSR_OE 0x0002
137 #define SERIAL_LSR_PE 0x0004
138 #define SERIAL_LSR_FE 0x0008
139 #define SERIAL_LSR_BI 0x0010
140
141 #define MOS_MSR_DELTA_CTS 0x10
142 #define MOS_MSR_DELTA_DSR 0x20
143 #define MOS_MSR_DELTA_RI 0x40
144 #define MOS_MSR_DELTA_CD 0x80
145
146 /* Serial Port register Address */
147 #define INTERRUPT_ENABLE_REGISTER ((__u16)(0x01))
148 #define FIFO_CONTROL_REGISTER ((__u16)(0x02))
149 #define LINE_CONTROL_REGISTER ((__u16)(0x03))
150 #define MODEM_CONTROL_REGISTER ((__u16)(0x04))
151 #define LINE_STATUS_REGISTER ((__u16)(0x05))
152 #define MODEM_STATUS_REGISTER ((__u16)(0x06))
153 #define SCRATCH_PAD_REGISTER ((__u16)(0x07))
154 #define DIVISOR_LATCH_LSB ((__u16)(0x00))
155 #define DIVISOR_LATCH_MSB ((__u16)(0x01))
156
157 #define CLK_MULTI_REGISTER ((__u16)(0x02))
158 #define CLK_START_VALUE_REGISTER ((__u16)(0x03))
159 #define GPIO_REGISTER ((__u16)(0x07))
160
161 #define SERIAL_LCR_DLAB ((__u16)(0x0080))
162
163 /*
164 * URB POOL related defines
165 */
166 #define NUM_URBS 16 /* URB Count */
167 #define URB_TRANSFER_BUFFER_SIZE 32 /* URB Size */
168
169 /* LED on/off milliseconds*/
170 #define LED_ON_MS 500
171 #define LED_OFF_MS 500
172
173 enum mos7840_flag {
174 MOS7840_FLAG_CTRL_BUSY,
175 MOS7840_FLAG_LED_BUSY,
176 };
177
178 static const struct usb_device_id id_table[] = {
179 {USB_DEVICE(USB_VENDOR_ID_MOSCHIP, MOSCHIP_DEVICE_ID_7840)},
180 {USB_DEVICE(USB_VENDOR_ID_MOSCHIP, MOSCHIP_DEVICE_ID_7843)},
181 {USB_DEVICE(USB_VENDOR_ID_MOSCHIP, MOSCHIP_DEVICE_ID_7820)},
182 {USB_DEVICE(USB_VENDOR_ID_MOSCHIP, MOSCHIP_DEVICE_ID_7810)},
183 {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USO9ML2_2)},
184 {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USO9ML2_2P)},
185 {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USO9ML2_4)},
186 {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USO9ML2_4P)},
187 {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_US9ML2_2)},
188 {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_US9ML2_4)},
189 {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USPTL4_2)},
190 {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USPTL4_4)},
191 {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USOPTL4_2)},
192 {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USOPTL4_2P)},
193 {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USOPTL4_4)},
194 {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USOPTL4_4P)},
195 {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USOPTL2_4)},
196 {USB_DEVICE(USB_VENDOR_ID_ATENINTL, ATENINTL_DEVICE_ID_UC2324)},
197 {USB_DEVICE(USB_VENDOR_ID_ATENINTL, ATENINTL_DEVICE_ID_UC2322)},
198 {} /* terminating entry */
199 };
200 MODULE_DEVICE_TABLE(usb, id_table);
201
202 /* This structure holds all of the local port information */
203
204 struct moschip_port {
205 int port_num; /*Actual port number in the device(1,2,etc) */
206 struct urb *read_urb; /* read URB for this port */
207 __u8 shadowLCR; /* last LCR value received */
208 __u8 shadowMCR; /* last MCR value received */
209 char open;
210 char open_ports;
211 struct usb_serial_port *port; /* loop back to the owner of this object */
212
213 /* Offsets */
214 __u8 SpRegOffset;
215 __u8 ControlRegOffset;
216 __u8 DcrRegOffset;
217 /* for processing control URBS in interrupt context */
218 struct urb *control_urb;
219 struct usb_ctrlrequest *dr;
220 char *ctrl_buf;
221 int MsrLsr;
222
223 spinlock_t pool_lock;
224 struct urb *write_urb_pool[NUM_URBS];
225 char busy[NUM_URBS];
226 bool read_urb_busy;
227
228 /* For device(s) with LED indicator */
229 bool has_led;
230 struct timer_list led_timer1; /* Timer for LED on */
231 struct timer_list led_timer2; /* Timer for LED off */
232 struct urb *led_urb;
233 struct usb_ctrlrequest *led_dr;
234
235 unsigned long flags;
236 };
237
238 /*
239 * mos7840_set_reg_sync
240 * To set the Control register by calling usb_fill_control_urb function
241 * by passing usb_sndctrlpipe function as parameter.
242 */
243
mos7840_set_reg_sync(struct usb_serial_port * port,__u16 reg,__u16 val)244 static int mos7840_set_reg_sync(struct usb_serial_port *port, __u16 reg,
245 __u16 val)
246 {
247 struct usb_device *dev = port->serial->dev;
248 val = val & 0x00ff;
249 dev_dbg(&port->dev, "mos7840_set_reg_sync offset is %x, value %x\n", reg, val);
250
251 return usb_control_msg(dev, usb_sndctrlpipe(dev, 0), MCS_WRREQ,
252 MCS_WR_RTYPE, val, reg, NULL, 0,
253 MOS_WDR_TIMEOUT);
254 }
255
256 /*
257 * mos7840_get_reg_sync
258 * To set the Uart register by calling usb_fill_control_urb function by
259 * passing usb_rcvctrlpipe function as parameter.
260 */
261
mos7840_get_reg_sync(struct usb_serial_port * port,__u16 reg,__u16 * val)262 static int mos7840_get_reg_sync(struct usb_serial_port *port, __u16 reg,
263 __u16 *val)
264 {
265 struct usb_device *dev = port->serial->dev;
266 int ret = 0;
267 u8 *buf;
268
269 buf = kmalloc(VENDOR_READ_LENGTH, GFP_KERNEL);
270 if (!buf)
271 return -ENOMEM;
272
273 ret = usb_control_msg(dev, usb_rcvctrlpipe(dev, 0), MCS_RDREQ,
274 MCS_RD_RTYPE, 0, reg, buf, VENDOR_READ_LENGTH,
275 MOS_WDR_TIMEOUT);
276 if (ret < VENDOR_READ_LENGTH) {
277 if (ret >= 0)
278 ret = -EIO;
279 goto out;
280 }
281
282 *val = buf[0];
283 dev_dbg(&port->dev, "%s offset is %x, return val %x\n", __func__, reg, *val);
284 out:
285 kfree(buf);
286 return ret;
287 }
288
289 /*
290 * mos7840_set_uart_reg
291 * To set the Uart register by calling usb_fill_control_urb function by
292 * passing usb_sndctrlpipe function as parameter.
293 */
294
mos7840_set_uart_reg(struct usb_serial_port * port,__u16 reg,__u16 val)295 static int mos7840_set_uart_reg(struct usb_serial_port *port, __u16 reg,
296 __u16 val)
297 {
298
299 struct usb_device *dev = port->serial->dev;
300 val = val & 0x00ff;
301 /* For the UART control registers, the application number need
302 to be Or'ed */
303 if (port->serial->num_ports == 2 && port->port_number != 0)
304 val |= ((__u16)port->port_number + 2) << 8;
305 else
306 val |= ((__u16)port->port_number + 1) << 8;
307 dev_dbg(&port->dev, "%s application number is %x\n", __func__, val);
308 return usb_control_msg(dev, usb_sndctrlpipe(dev, 0), MCS_WRREQ,
309 MCS_WR_RTYPE, val, reg, NULL, 0,
310 MOS_WDR_TIMEOUT);
311
312 }
313
314 /*
315 * mos7840_get_uart_reg
316 * To set the Control register by calling usb_fill_control_urb function
317 * by passing usb_rcvctrlpipe function as parameter.
318 */
mos7840_get_uart_reg(struct usb_serial_port * port,__u16 reg,__u16 * val)319 static int mos7840_get_uart_reg(struct usb_serial_port *port, __u16 reg,
320 __u16 *val)
321 {
322 struct usb_device *dev = port->serial->dev;
323 int ret = 0;
324 __u16 Wval;
325 u8 *buf;
326
327 buf = kmalloc(VENDOR_READ_LENGTH, GFP_KERNEL);
328 if (!buf)
329 return -ENOMEM;
330
331 /* Wval is same as application number */
332 if (port->serial->num_ports == 2 && port->port_number != 0)
333 Wval = ((__u16)port->port_number + 2) << 8;
334 else
335 Wval = ((__u16)port->port_number + 1) << 8;
336 dev_dbg(&port->dev, "%s application number is %x\n", __func__, Wval);
337 ret = usb_control_msg(dev, usb_rcvctrlpipe(dev, 0), MCS_RDREQ,
338 MCS_RD_RTYPE, Wval, reg, buf, VENDOR_READ_LENGTH,
339 MOS_WDR_TIMEOUT);
340 if (ret < VENDOR_READ_LENGTH) {
341 if (ret >= 0)
342 ret = -EIO;
343 goto out;
344 }
345 *val = buf[0];
346 out:
347 kfree(buf);
348 return ret;
349 }
350
mos7840_dump_serial_port(struct usb_serial_port * port,struct moschip_port * mos7840_port)351 static void mos7840_dump_serial_port(struct usb_serial_port *port,
352 struct moschip_port *mos7840_port)
353 {
354
355 dev_dbg(&port->dev, "SpRegOffset is %2x\n", mos7840_port->SpRegOffset);
356 dev_dbg(&port->dev, "ControlRegOffset is %2x\n", mos7840_port->ControlRegOffset);
357 dev_dbg(&port->dev, "DCRRegOffset is %2x\n", mos7840_port->DcrRegOffset);
358
359 }
360
361 /************************************************************************/
362 /************************************************************************/
363 /* I N T E R F A C E F U N C T I O N S */
364 /* I N T E R F A C E F U N C T I O N S */
365 /************************************************************************/
366 /************************************************************************/
367
mos7840_set_port_private(struct usb_serial_port * port,struct moschip_port * data)368 static inline void mos7840_set_port_private(struct usb_serial_port *port,
369 struct moschip_port *data)
370 {
371 usb_set_serial_port_data(port, (void *)data);
372 }
373
mos7840_get_port_private(struct usb_serial_port * port)374 static inline struct moschip_port *mos7840_get_port_private(struct
375 usb_serial_port
376 *port)
377 {
378 return (struct moschip_port *)usb_get_serial_port_data(port);
379 }
380
mos7840_handle_new_msr(struct moschip_port * port,__u8 new_msr)381 static void mos7840_handle_new_msr(struct moschip_port *port, __u8 new_msr)
382 {
383 struct moschip_port *mos7840_port;
384 struct async_icount *icount;
385 mos7840_port = port;
386 if (new_msr &
387 (MOS_MSR_DELTA_CTS | MOS_MSR_DELTA_DSR | MOS_MSR_DELTA_RI |
388 MOS_MSR_DELTA_CD)) {
389 icount = &mos7840_port->port->icount;
390
391 /* update input line counters */
392 if (new_msr & MOS_MSR_DELTA_CTS)
393 icount->cts++;
394 if (new_msr & MOS_MSR_DELTA_DSR)
395 icount->dsr++;
396 if (new_msr & MOS_MSR_DELTA_CD)
397 icount->dcd++;
398 if (new_msr & MOS_MSR_DELTA_RI)
399 icount->rng++;
400
401 wake_up_interruptible(&port->port->port.delta_msr_wait);
402 }
403 }
404
mos7840_handle_new_lsr(struct moschip_port * port,__u8 new_lsr)405 static void mos7840_handle_new_lsr(struct moschip_port *port, __u8 new_lsr)
406 {
407 struct async_icount *icount;
408
409 if (new_lsr & SERIAL_LSR_BI) {
410 /*
411 * Parity and Framing errors only count if they
412 * occur exclusive of a break being
413 * received.
414 */
415 new_lsr &= (__u8) (SERIAL_LSR_OE | SERIAL_LSR_BI);
416 }
417
418 /* update input line counters */
419 icount = &port->port->icount;
420 if (new_lsr & SERIAL_LSR_BI)
421 icount->brk++;
422 if (new_lsr & SERIAL_LSR_OE)
423 icount->overrun++;
424 if (new_lsr & SERIAL_LSR_PE)
425 icount->parity++;
426 if (new_lsr & SERIAL_LSR_FE)
427 icount->frame++;
428 }
429
430 /************************************************************************/
431 /************************************************************************/
432 /* U S B C A L L B A C K F U N C T I O N S */
433 /* U S B C A L L B A C K F U N C T I O N S */
434 /************************************************************************/
435 /************************************************************************/
436
mos7840_control_callback(struct urb * urb)437 static void mos7840_control_callback(struct urb *urb)
438 {
439 unsigned char *data;
440 struct moschip_port *mos7840_port;
441 struct device *dev = &urb->dev->dev;
442 __u8 regval = 0x0;
443 int status = urb->status;
444
445 mos7840_port = urb->context;
446
447 switch (status) {
448 case 0:
449 /* success */
450 break;
451 case -ECONNRESET:
452 case -ENOENT:
453 case -ESHUTDOWN:
454 /* this urb is terminated, clean up */
455 dev_dbg(dev, "%s - urb shutting down with status: %d\n", __func__, status);
456 goto out;
457 default:
458 dev_dbg(dev, "%s - nonzero urb status received: %d\n", __func__, status);
459 goto out;
460 }
461
462 dev_dbg(dev, "%s urb buffer size is %d\n", __func__, urb->actual_length);
463 if (urb->actual_length < 1)
464 goto out;
465
466 dev_dbg(dev, "%s mos7840_port->MsrLsr is %d port %d\n", __func__,
467 mos7840_port->MsrLsr, mos7840_port->port_num);
468 data = urb->transfer_buffer;
469 regval = (__u8) data[0];
470 dev_dbg(dev, "%s data is %x\n", __func__, regval);
471 if (mos7840_port->MsrLsr == 0)
472 mos7840_handle_new_msr(mos7840_port, regval);
473 else if (mos7840_port->MsrLsr == 1)
474 mos7840_handle_new_lsr(mos7840_port, regval);
475 out:
476 clear_bit_unlock(MOS7840_FLAG_CTRL_BUSY, &mos7840_port->flags);
477 }
478
mos7840_get_reg(struct moschip_port * mcs,__u16 Wval,__u16 reg,__u16 * val)479 static int mos7840_get_reg(struct moschip_port *mcs, __u16 Wval, __u16 reg,
480 __u16 *val)
481 {
482 struct usb_device *dev = mcs->port->serial->dev;
483 struct usb_ctrlrequest *dr = mcs->dr;
484 unsigned char *buffer = mcs->ctrl_buf;
485 int ret;
486
487 if (test_and_set_bit_lock(MOS7840_FLAG_CTRL_BUSY, &mcs->flags))
488 return -EBUSY;
489
490 dr->bRequestType = MCS_RD_RTYPE;
491 dr->bRequest = MCS_RDREQ;
492 dr->wValue = cpu_to_le16(Wval); /* 0 */
493 dr->wIndex = cpu_to_le16(reg);
494 dr->wLength = cpu_to_le16(2);
495
496 usb_fill_control_urb(mcs->control_urb, dev, usb_rcvctrlpipe(dev, 0),
497 (unsigned char *)dr, buffer, 2,
498 mos7840_control_callback, mcs);
499 mcs->control_urb->transfer_buffer_length = 2;
500 ret = usb_submit_urb(mcs->control_urb, GFP_ATOMIC);
501 if (ret)
502 clear_bit_unlock(MOS7840_FLAG_CTRL_BUSY, &mcs->flags);
503
504 return ret;
505 }
506
mos7840_set_led_callback(struct urb * urb)507 static void mos7840_set_led_callback(struct urb *urb)
508 {
509 switch (urb->status) {
510 case 0:
511 /* Success */
512 break;
513 case -ECONNRESET:
514 case -ENOENT:
515 case -ESHUTDOWN:
516 /* This urb is terminated, clean up */
517 dev_dbg(&urb->dev->dev, "%s - urb shutting down: %d\n",
518 __func__, urb->status);
519 break;
520 default:
521 dev_dbg(&urb->dev->dev, "%s - nonzero urb status: %d\n",
522 __func__, urb->status);
523 }
524 }
525
mos7840_set_led_async(struct moschip_port * mcs,__u16 wval,__u16 reg)526 static void mos7840_set_led_async(struct moschip_port *mcs, __u16 wval,
527 __u16 reg)
528 {
529 struct usb_device *dev = mcs->port->serial->dev;
530 struct usb_ctrlrequest *dr = mcs->led_dr;
531
532 dr->bRequestType = MCS_WR_RTYPE;
533 dr->bRequest = MCS_WRREQ;
534 dr->wValue = cpu_to_le16(wval);
535 dr->wIndex = cpu_to_le16(reg);
536 dr->wLength = cpu_to_le16(0);
537
538 usb_fill_control_urb(mcs->led_urb, dev, usb_sndctrlpipe(dev, 0),
539 (unsigned char *)dr, NULL, 0, mos7840_set_led_callback, NULL);
540
541 usb_submit_urb(mcs->led_urb, GFP_ATOMIC);
542 }
543
mos7840_set_led_sync(struct usb_serial_port * port,__u16 reg,__u16 val)544 static void mos7840_set_led_sync(struct usb_serial_port *port, __u16 reg,
545 __u16 val)
546 {
547 struct usb_device *dev = port->serial->dev;
548
549 usb_control_msg(dev, usb_sndctrlpipe(dev, 0), MCS_WRREQ, MCS_WR_RTYPE,
550 val, reg, NULL, 0, MOS_WDR_TIMEOUT);
551 }
552
mos7840_led_off(struct timer_list * t)553 static void mos7840_led_off(struct timer_list *t)
554 {
555 struct moschip_port *mcs = from_timer(mcs, t, led_timer1);
556
557 /* Turn off LED */
558 mos7840_set_led_async(mcs, 0x0300, MODEM_CONTROL_REGISTER);
559 mod_timer(&mcs->led_timer2,
560 jiffies + msecs_to_jiffies(LED_OFF_MS));
561 }
562
mos7840_led_flag_off(struct timer_list * t)563 static void mos7840_led_flag_off(struct timer_list *t)
564 {
565 struct moschip_port *mcs = from_timer(mcs, t, led_timer2);
566
567 clear_bit_unlock(MOS7840_FLAG_LED_BUSY, &mcs->flags);
568 }
569
mos7840_led_activity(struct usb_serial_port * port)570 static void mos7840_led_activity(struct usb_serial_port *port)
571 {
572 struct moschip_port *mos7840_port = usb_get_serial_port_data(port);
573
574 if (test_and_set_bit_lock(MOS7840_FLAG_LED_BUSY, &mos7840_port->flags))
575 return;
576
577 mos7840_set_led_async(mos7840_port, 0x0301, MODEM_CONTROL_REGISTER);
578 mod_timer(&mos7840_port->led_timer1,
579 jiffies + msecs_to_jiffies(LED_ON_MS));
580 }
581
582 /*****************************************************************************
583 * mos7840_interrupt_callback
584 * this is the callback function for when we have received data on the
585 * interrupt endpoint.
586 *****************************************************************************/
587
mos7840_interrupt_callback(struct urb * urb)588 static void mos7840_interrupt_callback(struct urb *urb)
589 {
590 int result;
591 int length;
592 struct moschip_port *mos7840_port;
593 struct usb_serial *serial;
594 __u16 Data;
595 unsigned char *data;
596 __u8 sp[5];
597 int i, rv = 0;
598 __u16 wval, wreg = 0;
599 int status = urb->status;
600
601 switch (status) {
602 case 0:
603 /* success */
604 break;
605 case -ECONNRESET:
606 case -ENOENT:
607 case -ESHUTDOWN:
608 /* this urb is terminated, clean up */
609 dev_dbg(&urb->dev->dev, "%s - urb shutting down with status: %d\n",
610 __func__, status);
611 return;
612 default:
613 dev_dbg(&urb->dev->dev, "%s - nonzero urb status received: %d\n",
614 __func__, status);
615 goto exit;
616 }
617
618 length = urb->actual_length;
619 data = urb->transfer_buffer;
620
621 serial = urb->context;
622
623 /* Moschip get 5 bytes
624 * Byte 1 IIR Port 1 (port.number is 0)
625 * Byte 2 IIR Port 2 (port.number is 1)
626 * Byte 3 IIR Port 3 (port.number is 2)
627 * Byte 4 IIR Port 4 (port.number is 3)
628 * Byte 5 FIFO status for both */
629
630 if (length > 5) {
631 dev_dbg(&urb->dev->dev, "%s", "Wrong data !!!\n");
632 return;
633 }
634
635 sp[0] = (__u8) data[0];
636 sp[1] = (__u8) data[1];
637 sp[2] = (__u8) data[2];
638 sp[3] = (__u8) data[3];
639
640 for (i = 0; i < serial->num_ports; i++) {
641 mos7840_port = mos7840_get_port_private(serial->port[i]);
642 wval = ((__u16)serial->port[i]->port_number + 1) << 8;
643 if (mos7840_port->open) {
644 if (sp[i] & 0x01) {
645 dev_dbg(&urb->dev->dev, "SP%d No Interrupt !!!\n", i);
646 } else {
647 switch (sp[i] & 0x0f) {
648 case SERIAL_IIR_RLS:
649 dev_dbg(&urb->dev->dev, "Serial Port %d: Receiver status error or \n", i);
650 dev_dbg(&urb->dev->dev, "address bit detected in 9-bit mode\n");
651 mos7840_port->MsrLsr = 1;
652 wreg = LINE_STATUS_REGISTER;
653 break;
654 case SERIAL_IIR_MS:
655 dev_dbg(&urb->dev->dev, "Serial Port %d: Modem status change\n", i);
656 mos7840_port->MsrLsr = 0;
657 wreg = MODEM_STATUS_REGISTER;
658 break;
659 }
660 rv = mos7840_get_reg(mos7840_port, wval, wreg, &Data);
661 }
662 }
663 }
664 if (!(rv < 0))
665 /* the completion handler for the control urb will resubmit */
666 return;
667 exit:
668 result = usb_submit_urb(urb, GFP_ATOMIC);
669 if (result) {
670 dev_err(&urb->dev->dev,
671 "%s - Error %d submitting interrupt urb\n",
672 __func__, result);
673 }
674 }
675
mos7840_port_paranoia_check(struct usb_serial_port * port,const char * function)676 static int mos7840_port_paranoia_check(struct usb_serial_port *port,
677 const char *function)
678 {
679 if (!port) {
680 pr_debug("%s - port == NULL\n", function);
681 return -1;
682 }
683 if (!port->serial) {
684 pr_debug("%s - port->serial == NULL\n", function);
685 return -1;
686 }
687
688 return 0;
689 }
690
691 /* Inline functions to check the sanity of a pointer that is passed to us */
mos7840_serial_paranoia_check(struct usb_serial * serial,const char * function)692 static int mos7840_serial_paranoia_check(struct usb_serial *serial,
693 const char *function)
694 {
695 if (!serial) {
696 pr_debug("%s - serial == NULL\n", function);
697 return -1;
698 }
699 if (!serial->type) {
700 pr_debug("%s - serial->type == NULL!\n", function);
701 return -1;
702 }
703
704 return 0;
705 }
706
mos7840_get_usb_serial(struct usb_serial_port * port,const char * function)707 static struct usb_serial *mos7840_get_usb_serial(struct usb_serial_port *port,
708 const char *function)
709 {
710 /* if no port was specified, or it fails a paranoia check */
711 if (!port ||
712 mos7840_port_paranoia_check(port, function) ||
713 mos7840_serial_paranoia_check(port->serial, function)) {
714 /* then say that we don't have a valid usb_serial thing,
715 * which will end up genrating -ENODEV return values */
716 return NULL;
717 }
718
719 return port->serial;
720 }
721
722 /*****************************************************************************
723 * mos7840_bulk_in_callback
724 * this is the callback function for when we have received data on the
725 * bulk in endpoint.
726 *****************************************************************************/
727
mos7840_bulk_in_callback(struct urb * urb)728 static void mos7840_bulk_in_callback(struct urb *urb)
729 {
730 int retval;
731 unsigned char *data;
732 struct usb_serial *serial;
733 struct usb_serial_port *port;
734 struct moschip_port *mos7840_port;
735 int status = urb->status;
736
737 mos7840_port = urb->context;
738 if (!mos7840_port)
739 return;
740
741 if (status) {
742 dev_dbg(&urb->dev->dev, "nonzero read bulk status received: %d\n", status);
743 mos7840_port->read_urb_busy = false;
744 return;
745 }
746
747 port = mos7840_port->port;
748 if (mos7840_port_paranoia_check(port, __func__)) {
749 mos7840_port->read_urb_busy = false;
750 return;
751 }
752
753 serial = mos7840_get_usb_serial(port, __func__);
754 if (!serial) {
755 mos7840_port->read_urb_busy = false;
756 return;
757 }
758
759 data = urb->transfer_buffer;
760 usb_serial_debug_data(&port->dev, __func__, urb->actual_length, data);
761
762 if (urb->actual_length) {
763 struct tty_port *tport = &mos7840_port->port->port;
764 tty_insert_flip_string(tport, data, urb->actual_length);
765 tty_flip_buffer_push(tport);
766 port->icount.rx += urb->actual_length;
767 dev_dbg(&port->dev, "icount.rx is %d:\n", port->icount.rx);
768 }
769
770 if (!mos7840_port->read_urb) {
771 dev_dbg(&port->dev, "%s", "URB KILLED !!!\n");
772 mos7840_port->read_urb_busy = false;
773 return;
774 }
775
776 if (mos7840_port->has_led)
777 mos7840_led_activity(port);
778
779 mos7840_port->read_urb_busy = true;
780 retval = usb_submit_urb(mos7840_port->read_urb, GFP_ATOMIC);
781
782 if (retval) {
783 dev_dbg(&port->dev, "usb_submit_urb(read bulk) failed, retval = %d\n", retval);
784 mos7840_port->read_urb_busy = false;
785 }
786 }
787
788 /*****************************************************************************
789 * mos7840_bulk_out_data_callback
790 * this is the callback function for when we have finished sending
791 * serial data on the bulk out endpoint.
792 *****************************************************************************/
793
mos7840_bulk_out_data_callback(struct urb * urb)794 static void mos7840_bulk_out_data_callback(struct urb *urb)
795 {
796 struct moschip_port *mos7840_port;
797 struct usb_serial_port *port;
798 int status = urb->status;
799 unsigned long flags;
800 int i;
801
802 mos7840_port = urb->context;
803 port = mos7840_port->port;
804 spin_lock_irqsave(&mos7840_port->pool_lock, flags);
805 for (i = 0; i < NUM_URBS; i++) {
806 if (urb == mos7840_port->write_urb_pool[i]) {
807 mos7840_port->busy[i] = 0;
808 break;
809 }
810 }
811 spin_unlock_irqrestore(&mos7840_port->pool_lock, flags);
812
813 if (status) {
814 dev_dbg(&port->dev, "nonzero write bulk status received:%d\n", status);
815 return;
816 }
817
818 if (mos7840_port_paranoia_check(port, __func__))
819 return;
820
821 if (mos7840_port->open)
822 tty_port_tty_wakeup(&port->port);
823
824 }
825
826 /************************************************************************/
827 /* 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 */
828 /************************************************************************/
829
830 /*****************************************************************************
831 * mos7840_open
832 * this function is called by the tty driver when a port is opened
833 * If successful, we return 0
834 * Otherwise we return a negative error number.
835 *****************************************************************************/
836
mos7840_open(struct tty_struct * tty,struct usb_serial_port * port)837 static int mos7840_open(struct tty_struct *tty, struct usb_serial_port *port)
838 {
839 int response;
840 int j;
841 struct usb_serial *serial;
842 struct urb *urb;
843 __u16 Data;
844 int status;
845 struct moschip_port *mos7840_port;
846 struct moschip_port *port0;
847
848 if (mos7840_port_paranoia_check(port, __func__))
849 return -ENODEV;
850
851 serial = port->serial;
852
853 if (mos7840_serial_paranoia_check(serial, __func__))
854 return -ENODEV;
855
856 mos7840_port = mos7840_get_port_private(port);
857 port0 = mos7840_get_port_private(serial->port[0]);
858
859 if (mos7840_port == NULL || port0 == NULL)
860 return -ENODEV;
861
862 usb_clear_halt(serial->dev, port->write_urb->pipe);
863 usb_clear_halt(serial->dev, port->read_urb->pipe);
864 port0->open_ports++;
865
866 /* Initialising the write urb pool */
867 for (j = 0; j < NUM_URBS; ++j) {
868 urb = usb_alloc_urb(0, GFP_KERNEL);
869 mos7840_port->write_urb_pool[j] = urb;
870 if (!urb)
871 continue;
872
873 urb->transfer_buffer = kmalloc(URB_TRANSFER_BUFFER_SIZE,
874 GFP_KERNEL);
875 if (!urb->transfer_buffer) {
876 usb_free_urb(urb);
877 mos7840_port->write_urb_pool[j] = NULL;
878 continue;
879 }
880 }
881
882 /*****************************************************************************
883 * Initialize MCS7840 -- Write Init values to corresponding Registers
884 *
885 * Register Index
886 * 1 : IER
887 * 2 : FCR
888 * 3 : LCR
889 * 4 : MCR
890 *
891 * 0x08 : SP1/2 Control Reg
892 *****************************************************************************/
893
894 /* NEED to check the following Block */
895
896 Data = 0x0;
897 status = mos7840_get_reg_sync(port, mos7840_port->SpRegOffset, &Data);
898 if (status < 0) {
899 dev_dbg(&port->dev, "Reading Spreg failed\n");
900 goto err;
901 }
902 Data |= 0x80;
903 status = mos7840_set_reg_sync(port, mos7840_port->SpRegOffset, Data);
904 if (status < 0) {
905 dev_dbg(&port->dev, "writing Spreg failed\n");
906 goto err;
907 }
908
909 Data &= ~0x80;
910 status = mos7840_set_reg_sync(port, mos7840_port->SpRegOffset, Data);
911 if (status < 0) {
912 dev_dbg(&port->dev, "writing Spreg failed\n");
913 goto err;
914 }
915 /* End of block to be checked */
916
917 Data = 0x0;
918 status = mos7840_get_reg_sync(port, mos7840_port->ControlRegOffset,
919 &Data);
920 if (status < 0) {
921 dev_dbg(&port->dev, "Reading Controlreg failed\n");
922 goto err;
923 }
924 Data |= 0x08; /* Driver done bit */
925 Data |= 0x20; /* rx_disable */
926 status = mos7840_set_reg_sync(port,
927 mos7840_port->ControlRegOffset, Data);
928 if (status < 0) {
929 dev_dbg(&port->dev, "writing Controlreg failed\n");
930 goto err;
931 }
932 /* do register settings here */
933 /* Set all regs to the device default values. */
934 /***********************************
935 * First Disable all interrupts.
936 ***********************************/
937 Data = 0x00;
938 status = mos7840_set_uart_reg(port, INTERRUPT_ENABLE_REGISTER, Data);
939 if (status < 0) {
940 dev_dbg(&port->dev, "disabling interrupts failed\n");
941 goto err;
942 }
943 /* Set FIFO_CONTROL_REGISTER to the default value */
944 Data = 0x00;
945 status = mos7840_set_uart_reg(port, FIFO_CONTROL_REGISTER, Data);
946 if (status < 0) {
947 dev_dbg(&port->dev, "Writing FIFO_CONTROL_REGISTER failed\n");
948 goto err;
949 }
950
951 Data = 0xcf;
952 status = mos7840_set_uart_reg(port, FIFO_CONTROL_REGISTER, Data);
953 if (status < 0) {
954 dev_dbg(&port->dev, "Writing FIFO_CONTROL_REGISTER failed\n");
955 goto err;
956 }
957
958 Data = 0x03;
959 status = mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data);
960 mos7840_port->shadowLCR = Data;
961
962 Data = 0x0b;
963 status = mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER, Data);
964 mos7840_port->shadowMCR = Data;
965
966 Data = 0x00;
967 status = mos7840_get_uart_reg(port, LINE_CONTROL_REGISTER, &Data);
968 mos7840_port->shadowLCR = Data;
969
970 Data |= SERIAL_LCR_DLAB; /* data latch enable in LCR 0x80 */
971 status = mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data);
972
973 Data = 0x0c;
974 status = mos7840_set_uart_reg(port, DIVISOR_LATCH_LSB, Data);
975
976 Data = 0x0;
977 status = mos7840_set_uart_reg(port, DIVISOR_LATCH_MSB, Data);
978
979 Data = 0x00;
980 status = mos7840_get_uart_reg(port, LINE_CONTROL_REGISTER, &Data);
981
982 Data = Data & ~SERIAL_LCR_DLAB;
983 status = mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data);
984 mos7840_port->shadowLCR = Data;
985
986 /* clearing Bulkin and Bulkout Fifo */
987 Data = 0x0;
988 status = mos7840_get_reg_sync(port, mos7840_port->SpRegOffset, &Data);
989
990 Data = Data | 0x0c;
991 status = mos7840_set_reg_sync(port, mos7840_port->SpRegOffset, Data);
992
993 Data = Data & ~0x0c;
994 status = mos7840_set_reg_sync(port, mos7840_port->SpRegOffset, Data);
995 /* Finally enable all interrupts */
996 Data = 0x0c;
997 status = mos7840_set_uart_reg(port, INTERRUPT_ENABLE_REGISTER, Data);
998
999 /* clearing rx_disable */
1000 Data = 0x0;
1001 status = mos7840_get_reg_sync(port, mos7840_port->ControlRegOffset,
1002 &Data);
1003 Data = Data & ~0x20;
1004 status = mos7840_set_reg_sync(port, mos7840_port->ControlRegOffset,
1005 Data);
1006
1007 /* rx_negate */
1008 Data = 0x0;
1009 status = mos7840_get_reg_sync(port, mos7840_port->ControlRegOffset,
1010 &Data);
1011 Data = Data | 0x10;
1012 status = mos7840_set_reg_sync(port, mos7840_port->ControlRegOffset,
1013 Data);
1014
1015 /* Check to see if we've set up our endpoint info yet *
1016 * (can't set it up in mos7840_startup as the structures *
1017 * were not set up at that time.) */
1018 if (port0->open_ports == 1) {
1019 /* FIXME: Buffer never NULL, so URB is not submitted. */
1020 if (serial->port[0]->interrupt_in_buffer == NULL) {
1021 /* set up interrupt urb */
1022 usb_fill_int_urb(serial->port[0]->interrupt_in_urb,
1023 serial->dev,
1024 usb_rcvintpipe(serial->dev,
1025 serial->port[0]->interrupt_in_endpointAddress),
1026 serial->port[0]->interrupt_in_buffer,
1027 serial->port[0]->interrupt_in_urb->
1028 transfer_buffer_length,
1029 mos7840_interrupt_callback,
1030 serial,
1031 serial->port[0]->interrupt_in_urb->interval);
1032
1033 /* start interrupt read for mos7840 */
1034 response =
1035 usb_submit_urb(serial->port[0]->interrupt_in_urb,
1036 GFP_KERNEL);
1037 if (response) {
1038 dev_err(&port->dev, "%s - Error %d submitting "
1039 "interrupt urb\n", __func__, response);
1040 }
1041
1042 }
1043
1044 }
1045
1046 /* see if we've set up our endpoint info yet *
1047 * (can't set it up in mos7840_startup as the *
1048 * structures were not set up at that time.) */
1049
1050 dev_dbg(&port->dev, "port number is %d\n", port->port_number);
1051 dev_dbg(&port->dev, "minor number is %d\n", port->minor);
1052 dev_dbg(&port->dev, "Bulkin endpoint is %d\n", port->bulk_in_endpointAddress);
1053 dev_dbg(&port->dev, "BulkOut endpoint is %d\n", port->bulk_out_endpointAddress);
1054 dev_dbg(&port->dev, "Interrupt endpoint is %d\n", port->interrupt_in_endpointAddress);
1055 dev_dbg(&port->dev, "port's number in the device is %d\n", mos7840_port->port_num);
1056 mos7840_port->read_urb = port->read_urb;
1057
1058 /* set up our bulk in urb */
1059 if ((serial->num_ports == 2) && (((__u16)port->port_number % 2) != 0)) {
1060 usb_fill_bulk_urb(mos7840_port->read_urb,
1061 serial->dev,
1062 usb_rcvbulkpipe(serial->dev,
1063 (port->bulk_in_endpointAddress) + 2),
1064 port->bulk_in_buffer,
1065 mos7840_port->read_urb->transfer_buffer_length,
1066 mos7840_bulk_in_callback, mos7840_port);
1067 } else {
1068 usb_fill_bulk_urb(mos7840_port->read_urb,
1069 serial->dev,
1070 usb_rcvbulkpipe(serial->dev,
1071 port->bulk_in_endpointAddress),
1072 port->bulk_in_buffer,
1073 mos7840_port->read_urb->transfer_buffer_length,
1074 mos7840_bulk_in_callback, mos7840_port);
1075 }
1076
1077 dev_dbg(&port->dev, "%s: bulkin endpoint is %d\n", __func__, port->bulk_in_endpointAddress);
1078 mos7840_port->read_urb_busy = true;
1079 response = usb_submit_urb(mos7840_port->read_urb, GFP_KERNEL);
1080 if (response) {
1081 dev_err(&port->dev, "%s - Error %d submitting control urb\n",
1082 __func__, response);
1083 mos7840_port->read_urb_busy = false;
1084 }
1085
1086 /* initialize our port settings */
1087 /* Must set to enable ints! */
1088 mos7840_port->shadowMCR = MCR_MASTER_IE;
1089 /* send a open port command */
1090 mos7840_port->open = 1;
1091 /* mos7840_change_port_settings(mos7840_port,old_termios); */
1092
1093 return 0;
1094 err:
1095 for (j = 0; j < NUM_URBS; ++j) {
1096 urb = mos7840_port->write_urb_pool[j];
1097 if (!urb)
1098 continue;
1099 kfree(urb->transfer_buffer);
1100 usb_free_urb(urb);
1101 }
1102 return status;
1103 }
1104
1105 /*****************************************************************************
1106 * mos7840_chars_in_buffer
1107 * this function is called by the tty driver when it wants to know how many
1108 * bytes of data we currently have outstanding in the port (data that has
1109 * been written, but hasn't made it out the port yet)
1110 * If successful, we return the number of bytes left to be written in the
1111 * system,
1112 * Otherwise we return zero.
1113 *****************************************************************************/
1114
mos7840_chars_in_buffer(struct tty_struct * tty)1115 static int mos7840_chars_in_buffer(struct tty_struct *tty)
1116 {
1117 struct usb_serial_port *port = tty->driver_data;
1118 int i;
1119 int chars = 0;
1120 unsigned long flags;
1121 struct moschip_port *mos7840_port;
1122
1123 if (mos7840_port_paranoia_check(port, __func__))
1124 return 0;
1125
1126 mos7840_port = mos7840_get_port_private(port);
1127 if (mos7840_port == NULL)
1128 return 0;
1129
1130 spin_lock_irqsave(&mos7840_port->pool_lock, flags);
1131 for (i = 0; i < NUM_URBS; ++i) {
1132 if (mos7840_port->busy[i]) {
1133 struct urb *urb = mos7840_port->write_urb_pool[i];
1134 chars += urb->transfer_buffer_length;
1135 }
1136 }
1137 spin_unlock_irqrestore(&mos7840_port->pool_lock, flags);
1138 dev_dbg(&port->dev, "%s - returns %d\n", __func__, chars);
1139 return chars;
1140
1141 }
1142
1143 /*****************************************************************************
1144 * mos7840_close
1145 * this function is called by the tty driver when a port is closed
1146 *****************************************************************************/
1147
mos7840_close(struct usb_serial_port * port)1148 static void mos7840_close(struct usb_serial_port *port)
1149 {
1150 struct usb_serial *serial;
1151 struct moschip_port *mos7840_port;
1152 struct moschip_port *port0;
1153 int j;
1154 __u16 Data;
1155
1156 if (mos7840_port_paranoia_check(port, __func__))
1157 return;
1158
1159 serial = mos7840_get_usb_serial(port, __func__);
1160 if (!serial)
1161 return;
1162
1163 mos7840_port = mos7840_get_port_private(port);
1164 port0 = mos7840_get_port_private(serial->port[0]);
1165
1166 if (mos7840_port == NULL || port0 == NULL)
1167 return;
1168
1169 for (j = 0; j < NUM_URBS; ++j)
1170 usb_kill_urb(mos7840_port->write_urb_pool[j]);
1171
1172 /* Freeing Write URBs */
1173 for (j = 0; j < NUM_URBS; ++j) {
1174 if (mos7840_port->write_urb_pool[j]) {
1175 kfree(mos7840_port->write_urb_pool[j]->transfer_buffer);
1176 usb_free_urb(mos7840_port->write_urb_pool[j]);
1177 }
1178 }
1179
1180 usb_kill_urb(mos7840_port->read_urb);
1181 mos7840_port->read_urb_busy = false;
1182
1183 port0->open_ports--;
1184 dev_dbg(&port->dev, "%s in close%d\n", __func__, port0->open_ports);
1185 if (port0->open_ports == 0) {
1186 if (serial->port[0]->interrupt_in_urb) {
1187 dev_dbg(&port->dev, "Shutdown interrupt_in_urb\n");
1188 usb_kill_urb(serial->port[0]->interrupt_in_urb);
1189 }
1190 }
1191
1192 Data = 0x0;
1193 mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER, Data);
1194
1195 Data = 0x00;
1196 mos7840_set_uart_reg(port, INTERRUPT_ENABLE_REGISTER, Data);
1197
1198 mos7840_port->open = 0;
1199 }
1200
1201 /*****************************************************************************
1202 * mos7840_break
1203 * this function sends a break to the port
1204 *****************************************************************************/
mos7840_break(struct tty_struct * tty,int break_state)1205 static void mos7840_break(struct tty_struct *tty, int break_state)
1206 {
1207 struct usb_serial_port *port = tty->driver_data;
1208 unsigned char data;
1209 struct usb_serial *serial;
1210 struct moschip_port *mos7840_port;
1211
1212 if (mos7840_port_paranoia_check(port, __func__))
1213 return;
1214
1215 serial = mos7840_get_usb_serial(port, __func__);
1216 if (!serial)
1217 return;
1218
1219 mos7840_port = mos7840_get_port_private(port);
1220
1221 if (mos7840_port == NULL)
1222 return;
1223
1224 if (break_state == -1)
1225 data = mos7840_port->shadowLCR | LCR_SET_BREAK;
1226 else
1227 data = mos7840_port->shadowLCR & ~LCR_SET_BREAK;
1228
1229 /* FIXME: no locking on shadowLCR anywhere in driver */
1230 mos7840_port->shadowLCR = data;
1231 dev_dbg(&port->dev, "%s mos7840_port->shadowLCR is %x\n", __func__, mos7840_port->shadowLCR);
1232 mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER,
1233 mos7840_port->shadowLCR);
1234 }
1235
1236 /*****************************************************************************
1237 * mos7840_write_room
1238 * this function is called by the tty driver when it wants to know how many
1239 * bytes of data we can accept for a specific port.
1240 * If successful, we return the amount of room that we have for this port
1241 * Otherwise we return a negative error number.
1242 *****************************************************************************/
1243
mos7840_write_room(struct tty_struct * tty)1244 static int mos7840_write_room(struct tty_struct *tty)
1245 {
1246 struct usb_serial_port *port = tty->driver_data;
1247 int i;
1248 int room = 0;
1249 unsigned long flags;
1250 struct moschip_port *mos7840_port;
1251
1252 if (mos7840_port_paranoia_check(port, __func__))
1253 return -1;
1254
1255 mos7840_port = mos7840_get_port_private(port);
1256 if (mos7840_port == NULL)
1257 return -1;
1258
1259 spin_lock_irqsave(&mos7840_port->pool_lock, flags);
1260 for (i = 0; i < NUM_URBS; ++i) {
1261 if (!mos7840_port->busy[i])
1262 room += URB_TRANSFER_BUFFER_SIZE;
1263 }
1264 spin_unlock_irqrestore(&mos7840_port->pool_lock, flags);
1265
1266 room = (room == 0) ? 0 : room - URB_TRANSFER_BUFFER_SIZE + 1;
1267 dev_dbg(&mos7840_port->port->dev, "%s - returns %d\n", __func__, room);
1268 return room;
1269
1270 }
1271
1272 /*****************************************************************************
1273 * mos7840_write
1274 * this function is called by the tty driver when data should be written to
1275 * the port.
1276 * If successful, we return the number of bytes written, otherwise we
1277 * return a negative error number.
1278 *****************************************************************************/
1279
mos7840_write(struct tty_struct * tty,struct usb_serial_port * port,const unsigned char * data,int count)1280 static int mos7840_write(struct tty_struct *tty, struct usb_serial_port *port,
1281 const unsigned char *data, int count)
1282 {
1283 int status;
1284 int i;
1285 int bytes_sent = 0;
1286 int transfer_size;
1287 unsigned long flags;
1288
1289 struct moschip_port *mos7840_port;
1290 struct usb_serial *serial;
1291 struct urb *urb;
1292 /* __u16 Data; */
1293 const unsigned char *current_position = data;
1294
1295 if (mos7840_port_paranoia_check(port, __func__))
1296 return -1;
1297
1298 serial = port->serial;
1299 if (mos7840_serial_paranoia_check(serial, __func__))
1300 return -1;
1301
1302 mos7840_port = mos7840_get_port_private(port);
1303 if (mos7840_port == NULL)
1304 return -1;
1305
1306 /* try to find a free urb in the list */
1307 urb = NULL;
1308
1309 spin_lock_irqsave(&mos7840_port->pool_lock, flags);
1310 for (i = 0; i < NUM_URBS; ++i) {
1311 if (!mos7840_port->busy[i]) {
1312 mos7840_port->busy[i] = 1;
1313 urb = mos7840_port->write_urb_pool[i];
1314 dev_dbg(&port->dev, "URB:%d\n", i);
1315 break;
1316 }
1317 }
1318 spin_unlock_irqrestore(&mos7840_port->pool_lock, flags);
1319
1320 if (urb == NULL) {
1321 dev_dbg(&port->dev, "%s - no more free urbs\n", __func__);
1322 goto exit;
1323 }
1324
1325 if (urb->transfer_buffer == NULL) {
1326 urb->transfer_buffer = kmalloc(URB_TRANSFER_BUFFER_SIZE,
1327 GFP_ATOMIC);
1328 if (!urb->transfer_buffer)
1329 goto exit;
1330 }
1331 transfer_size = min(count, URB_TRANSFER_BUFFER_SIZE);
1332
1333 memcpy(urb->transfer_buffer, current_position, transfer_size);
1334
1335 /* fill urb with data and submit */
1336 if ((serial->num_ports == 2) && (((__u16)port->port_number % 2) != 0)) {
1337 usb_fill_bulk_urb(urb,
1338 serial->dev,
1339 usb_sndbulkpipe(serial->dev,
1340 (port->bulk_out_endpointAddress) + 2),
1341 urb->transfer_buffer,
1342 transfer_size,
1343 mos7840_bulk_out_data_callback, mos7840_port);
1344 } else {
1345 usb_fill_bulk_urb(urb,
1346 serial->dev,
1347 usb_sndbulkpipe(serial->dev,
1348 port->bulk_out_endpointAddress),
1349 urb->transfer_buffer,
1350 transfer_size,
1351 mos7840_bulk_out_data_callback, mos7840_port);
1352 }
1353
1354 dev_dbg(&port->dev, "bulkout endpoint is %d\n", port->bulk_out_endpointAddress);
1355
1356 if (mos7840_port->has_led)
1357 mos7840_led_activity(port);
1358
1359 /* send it down the pipe */
1360 status = usb_submit_urb(urb, GFP_ATOMIC);
1361
1362 if (status) {
1363 mos7840_port->busy[i] = 0;
1364 dev_err_console(port, "%s - usb_submit_urb(write bulk) failed "
1365 "with status = %d\n", __func__, status);
1366 bytes_sent = status;
1367 goto exit;
1368 }
1369 bytes_sent = transfer_size;
1370 port->icount.tx += transfer_size;
1371 dev_dbg(&port->dev, "icount.tx is %d:\n", port->icount.tx);
1372 exit:
1373 return bytes_sent;
1374
1375 }
1376
1377 /*****************************************************************************
1378 * mos7840_throttle
1379 * this function is called by the tty driver when it wants to stop the data
1380 * being read from the port.
1381 *****************************************************************************/
1382
mos7840_throttle(struct tty_struct * tty)1383 static void mos7840_throttle(struct tty_struct *tty)
1384 {
1385 struct usb_serial_port *port = tty->driver_data;
1386 struct moschip_port *mos7840_port;
1387 int status;
1388
1389 if (mos7840_port_paranoia_check(port, __func__))
1390 return;
1391
1392 mos7840_port = mos7840_get_port_private(port);
1393
1394 if (mos7840_port == NULL)
1395 return;
1396
1397 if (!mos7840_port->open) {
1398 dev_dbg(&port->dev, "%s", "port not opened\n");
1399 return;
1400 }
1401
1402 /* if we are implementing XON/XOFF, send the stop character */
1403 if (I_IXOFF(tty)) {
1404 unsigned char stop_char = STOP_CHAR(tty);
1405 status = mos7840_write(tty, port, &stop_char, 1);
1406 if (status <= 0)
1407 return;
1408 }
1409 /* if we are implementing RTS/CTS, toggle that line */
1410 if (C_CRTSCTS(tty)) {
1411 mos7840_port->shadowMCR &= ~MCR_RTS;
1412 status = mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER,
1413 mos7840_port->shadowMCR);
1414 if (status < 0)
1415 return;
1416 }
1417 }
1418
1419 /*****************************************************************************
1420 * mos7840_unthrottle
1421 * this function is called by the tty driver when it wants to resume
1422 * the data being read from the port (called after mos7840_throttle is
1423 * called)
1424 *****************************************************************************/
mos7840_unthrottle(struct tty_struct * tty)1425 static void mos7840_unthrottle(struct tty_struct *tty)
1426 {
1427 struct usb_serial_port *port = tty->driver_data;
1428 int status;
1429 struct moschip_port *mos7840_port = mos7840_get_port_private(port);
1430
1431 if (mos7840_port_paranoia_check(port, __func__))
1432 return;
1433
1434 if (mos7840_port == NULL)
1435 return;
1436
1437 if (!mos7840_port->open) {
1438 dev_dbg(&port->dev, "%s - port not opened\n", __func__);
1439 return;
1440 }
1441
1442 /* if we are implementing XON/XOFF, send the start character */
1443 if (I_IXOFF(tty)) {
1444 unsigned char start_char = START_CHAR(tty);
1445 status = mos7840_write(tty, port, &start_char, 1);
1446 if (status <= 0)
1447 return;
1448 }
1449
1450 /* if we are implementing RTS/CTS, toggle that line */
1451 if (C_CRTSCTS(tty)) {
1452 mos7840_port->shadowMCR |= MCR_RTS;
1453 status = mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER,
1454 mos7840_port->shadowMCR);
1455 if (status < 0)
1456 return;
1457 }
1458 }
1459
mos7840_tiocmget(struct tty_struct * tty)1460 static int mos7840_tiocmget(struct tty_struct *tty)
1461 {
1462 struct usb_serial_port *port = tty->driver_data;
1463 struct moschip_port *mos7840_port;
1464 unsigned int result;
1465 __u16 msr;
1466 __u16 mcr;
1467 int status;
1468 mos7840_port = mos7840_get_port_private(port);
1469
1470 if (mos7840_port == NULL)
1471 return -ENODEV;
1472
1473 status = mos7840_get_uart_reg(port, MODEM_STATUS_REGISTER, &msr);
1474 if (status < 0)
1475 return -EIO;
1476 status = mos7840_get_uart_reg(port, MODEM_CONTROL_REGISTER, &mcr);
1477 if (status < 0)
1478 return -EIO;
1479 result = ((mcr & MCR_DTR) ? TIOCM_DTR : 0)
1480 | ((mcr & MCR_RTS) ? TIOCM_RTS : 0)
1481 | ((mcr & MCR_LOOPBACK) ? TIOCM_LOOP : 0)
1482 | ((msr & MOS7840_MSR_CTS) ? TIOCM_CTS : 0)
1483 | ((msr & MOS7840_MSR_CD) ? TIOCM_CAR : 0)
1484 | ((msr & MOS7840_MSR_RI) ? TIOCM_RI : 0)
1485 | ((msr & MOS7840_MSR_DSR) ? TIOCM_DSR : 0);
1486
1487 dev_dbg(&port->dev, "%s - 0x%04X\n", __func__, result);
1488
1489 return result;
1490 }
1491
mos7840_tiocmset(struct tty_struct * tty,unsigned int set,unsigned int clear)1492 static int mos7840_tiocmset(struct tty_struct *tty,
1493 unsigned int set, unsigned int clear)
1494 {
1495 struct usb_serial_port *port = tty->driver_data;
1496 struct moschip_port *mos7840_port;
1497 unsigned int mcr;
1498 int status;
1499
1500 mos7840_port = mos7840_get_port_private(port);
1501
1502 if (mos7840_port == NULL)
1503 return -ENODEV;
1504
1505 /* FIXME: What locks the port registers ? */
1506 mcr = mos7840_port->shadowMCR;
1507 if (clear & TIOCM_RTS)
1508 mcr &= ~MCR_RTS;
1509 if (clear & TIOCM_DTR)
1510 mcr &= ~MCR_DTR;
1511 if (clear & TIOCM_LOOP)
1512 mcr &= ~MCR_LOOPBACK;
1513
1514 if (set & TIOCM_RTS)
1515 mcr |= MCR_RTS;
1516 if (set & TIOCM_DTR)
1517 mcr |= MCR_DTR;
1518 if (set & TIOCM_LOOP)
1519 mcr |= MCR_LOOPBACK;
1520
1521 mos7840_port->shadowMCR = mcr;
1522
1523 status = mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER, mcr);
1524 if (status < 0) {
1525 dev_dbg(&port->dev, "setting MODEM_CONTROL_REGISTER Failed\n");
1526 return status;
1527 }
1528
1529 return 0;
1530 }
1531
1532 /*****************************************************************************
1533 * mos7840_calc_baud_rate_divisor
1534 * this function calculates the proper baud rate divisor for the specified
1535 * baud rate.
1536 *****************************************************************************/
mos7840_calc_baud_rate_divisor(struct usb_serial_port * port,int baudRate,int * divisor,__u16 * clk_sel_val)1537 static int mos7840_calc_baud_rate_divisor(struct usb_serial_port *port,
1538 int baudRate, int *divisor,
1539 __u16 *clk_sel_val)
1540 {
1541 dev_dbg(&port->dev, "%s - %d\n", __func__, baudRate);
1542
1543 if (baudRate <= 115200) {
1544 *divisor = 115200 / baudRate;
1545 *clk_sel_val = 0x0;
1546 }
1547 if ((baudRate > 115200) && (baudRate <= 230400)) {
1548 *divisor = 230400 / baudRate;
1549 *clk_sel_val = 0x10;
1550 } else if ((baudRate > 230400) && (baudRate <= 403200)) {
1551 *divisor = 403200 / baudRate;
1552 *clk_sel_val = 0x20;
1553 } else if ((baudRate > 403200) && (baudRate <= 460800)) {
1554 *divisor = 460800 / baudRate;
1555 *clk_sel_val = 0x30;
1556 } else if ((baudRate > 460800) && (baudRate <= 806400)) {
1557 *divisor = 806400 / baudRate;
1558 *clk_sel_val = 0x40;
1559 } else if ((baudRate > 806400) && (baudRate <= 921600)) {
1560 *divisor = 921600 / baudRate;
1561 *clk_sel_val = 0x50;
1562 } else if ((baudRate > 921600) && (baudRate <= 1572864)) {
1563 *divisor = 1572864 / baudRate;
1564 *clk_sel_val = 0x60;
1565 } else if ((baudRate > 1572864) && (baudRate <= 3145728)) {
1566 *divisor = 3145728 / baudRate;
1567 *clk_sel_val = 0x70;
1568 }
1569 return 0;
1570 }
1571
1572 /*****************************************************************************
1573 * mos7840_send_cmd_write_baud_rate
1574 * this function sends the proper command to change the baud rate of the
1575 * specified port.
1576 *****************************************************************************/
1577
mos7840_send_cmd_write_baud_rate(struct moschip_port * mos7840_port,int baudRate)1578 static int mos7840_send_cmd_write_baud_rate(struct moschip_port *mos7840_port,
1579 int baudRate)
1580 {
1581 int divisor = 0;
1582 int status;
1583 __u16 Data;
1584 __u16 clk_sel_val;
1585 struct usb_serial_port *port;
1586
1587 if (mos7840_port == NULL)
1588 return -1;
1589
1590 port = mos7840_port->port;
1591 if (mos7840_port_paranoia_check(port, __func__))
1592 return -1;
1593
1594 if (mos7840_serial_paranoia_check(port->serial, __func__))
1595 return -1;
1596
1597 dev_dbg(&port->dev, "%s - baud = %d\n", __func__, baudRate);
1598 /* reset clk_uart_sel in spregOffset */
1599 if (baudRate > 115200) {
1600 #ifdef HW_flow_control
1601 /* NOTE: need to see the pther register to modify */
1602 /* setting h/w flow control bit to 1 */
1603 Data = 0x2b;
1604 mos7840_port->shadowMCR = Data;
1605 status = mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER,
1606 Data);
1607 if (status < 0) {
1608 dev_dbg(&port->dev, "Writing spreg failed in set_serial_baud\n");
1609 return -1;
1610 }
1611 #endif
1612
1613 } else {
1614 #ifdef HW_flow_control
1615 /* setting h/w flow control bit to 0 */
1616 Data = 0xb;
1617 mos7840_port->shadowMCR = Data;
1618 status = mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER,
1619 Data);
1620 if (status < 0) {
1621 dev_dbg(&port->dev, "Writing spreg failed in set_serial_baud\n");
1622 return -1;
1623 }
1624 #endif
1625
1626 }
1627
1628 if (1) { /* baudRate <= 115200) */
1629 clk_sel_val = 0x0;
1630 Data = 0x0;
1631 status = mos7840_calc_baud_rate_divisor(port, baudRate, &divisor,
1632 &clk_sel_val);
1633 status = mos7840_get_reg_sync(port, mos7840_port->SpRegOffset,
1634 &Data);
1635 if (status < 0) {
1636 dev_dbg(&port->dev, "reading spreg failed in set_serial_baud\n");
1637 return -1;
1638 }
1639 Data = (Data & 0x8f) | clk_sel_val;
1640 status = mos7840_set_reg_sync(port, mos7840_port->SpRegOffset,
1641 Data);
1642 if (status < 0) {
1643 dev_dbg(&port->dev, "Writing spreg failed in set_serial_baud\n");
1644 return -1;
1645 }
1646 /* Calculate the Divisor */
1647
1648 if (status) {
1649 dev_err(&port->dev, "%s - bad baud rate\n", __func__);
1650 return status;
1651 }
1652 /* Enable access to divisor latch */
1653 Data = mos7840_port->shadowLCR | SERIAL_LCR_DLAB;
1654 mos7840_port->shadowLCR = Data;
1655 mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data);
1656
1657 /* Write the divisor */
1658 Data = (unsigned char)(divisor & 0xff);
1659 dev_dbg(&port->dev, "set_serial_baud Value to write DLL is %x\n", Data);
1660 mos7840_set_uart_reg(port, DIVISOR_LATCH_LSB, Data);
1661
1662 Data = (unsigned char)((divisor & 0xff00) >> 8);
1663 dev_dbg(&port->dev, "set_serial_baud Value to write DLM is %x\n", Data);
1664 mos7840_set_uart_reg(port, DIVISOR_LATCH_MSB, Data);
1665
1666 /* Disable 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 }
1672 return status;
1673 }
1674
1675 /*****************************************************************************
1676 * mos7840_change_port_settings
1677 * This routine is called to set the UART on the device to match
1678 * the specified new settings.
1679 *****************************************************************************/
1680
mos7840_change_port_settings(struct tty_struct * tty,struct moschip_port * mos7840_port,struct ktermios * old_termios)1681 static void mos7840_change_port_settings(struct tty_struct *tty,
1682 struct moschip_port *mos7840_port, struct ktermios *old_termios)
1683 {
1684 int baud;
1685 unsigned cflag;
1686 __u8 lData;
1687 __u8 lParity;
1688 __u8 lStop;
1689 int status;
1690 __u16 Data;
1691 struct usb_serial_port *port;
1692
1693 if (mos7840_port == NULL)
1694 return;
1695
1696 port = mos7840_port->port;
1697
1698 if (mos7840_port_paranoia_check(port, __func__))
1699 return;
1700
1701 if (mos7840_serial_paranoia_check(port->serial, __func__))
1702 return;
1703
1704 if (!mos7840_port->open) {
1705 dev_dbg(&port->dev, "%s - port not opened\n", __func__);
1706 return;
1707 }
1708
1709 lData = LCR_BITS_8;
1710 lStop = LCR_STOP_1;
1711 lParity = LCR_PAR_NONE;
1712
1713 cflag = tty->termios.c_cflag;
1714
1715 /* Change the number of bits */
1716 switch (cflag & CSIZE) {
1717 case CS5:
1718 lData = LCR_BITS_5;
1719 break;
1720
1721 case CS6:
1722 lData = LCR_BITS_6;
1723 break;
1724
1725 case CS7:
1726 lData = LCR_BITS_7;
1727 break;
1728
1729 default:
1730 case CS8:
1731 lData = LCR_BITS_8;
1732 break;
1733 }
1734
1735 /* Change the Parity bit */
1736 if (cflag & PARENB) {
1737 if (cflag & PARODD) {
1738 lParity = LCR_PAR_ODD;
1739 dev_dbg(&port->dev, "%s - parity = odd\n", __func__);
1740 } else {
1741 lParity = LCR_PAR_EVEN;
1742 dev_dbg(&port->dev, "%s - parity = even\n", __func__);
1743 }
1744
1745 } else {
1746 dev_dbg(&port->dev, "%s - parity = none\n", __func__);
1747 }
1748
1749 if (cflag & CMSPAR)
1750 lParity = lParity | 0x20;
1751
1752 /* Change the Stop bit */
1753 if (cflag & CSTOPB) {
1754 lStop = LCR_STOP_2;
1755 dev_dbg(&port->dev, "%s - stop bits = 2\n", __func__);
1756 } else {
1757 lStop = LCR_STOP_1;
1758 dev_dbg(&port->dev, "%s - stop bits = 1\n", __func__);
1759 }
1760
1761 /* Update the LCR with the correct value */
1762 mos7840_port->shadowLCR &=
1763 ~(LCR_BITS_MASK | LCR_STOP_MASK | LCR_PAR_MASK);
1764 mos7840_port->shadowLCR |= (lData | lParity | lStop);
1765
1766 dev_dbg(&port->dev, "%s - mos7840_port->shadowLCR is %x\n", __func__,
1767 mos7840_port->shadowLCR);
1768 /* Disable Interrupts */
1769 Data = 0x00;
1770 mos7840_set_uart_reg(port, INTERRUPT_ENABLE_REGISTER, Data);
1771
1772 Data = 0x00;
1773 mos7840_set_uart_reg(port, FIFO_CONTROL_REGISTER, Data);
1774
1775 Data = 0xcf;
1776 mos7840_set_uart_reg(port, FIFO_CONTROL_REGISTER, Data);
1777
1778 /* Send the updated LCR value to the mos7840 */
1779 Data = mos7840_port->shadowLCR;
1780
1781 mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data);
1782
1783 Data = 0x00b;
1784 mos7840_port->shadowMCR = Data;
1785 mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER, Data);
1786 Data = 0x00b;
1787 mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER, Data);
1788
1789 /* set up the MCR register and send it to the mos7840 */
1790
1791 mos7840_port->shadowMCR = MCR_MASTER_IE;
1792 if (cflag & CBAUD)
1793 mos7840_port->shadowMCR |= (MCR_DTR | MCR_RTS);
1794
1795 if (cflag & CRTSCTS)
1796 mos7840_port->shadowMCR |= (MCR_XON_ANY);
1797 else
1798 mos7840_port->shadowMCR &= ~(MCR_XON_ANY);
1799
1800 Data = mos7840_port->shadowMCR;
1801 mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER, Data);
1802
1803 /* Determine divisor based on baud rate */
1804 baud = tty_get_baud_rate(tty);
1805
1806 if (!baud) {
1807 /* pick a default, any default... */
1808 dev_dbg(&port->dev, "%s", "Picked default baud...\n");
1809 baud = 9600;
1810 }
1811
1812 dev_dbg(&port->dev, "%s - baud rate = %d\n", __func__, baud);
1813 status = mos7840_send_cmd_write_baud_rate(mos7840_port, baud);
1814
1815 /* Enable Interrupts */
1816 Data = 0x0c;
1817 mos7840_set_uart_reg(port, INTERRUPT_ENABLE_REGISTER, Data);
1818
1819 if (!mos7840_port->read_urb_busy) {
1820 mos7840_port->read_urb_busy = true;
1821 status = usb_submit_urb(mos7840_port->read_urb, GFP_KERNEL);
1822 if (status) {
1823 dev_dbg(&port->dev, "usb_submit_urb(read bulk) failed, status = %d\n",
1824 status);
1825 mos7840_port->read_urb_busy = false;
1826 }
1827 }
1828 dev_dbg(&port->dev, "%s - mos7840_port->shadowLCR is End %x\n", __func__,
1829 mos7840_port->shadowLCR);
1830 }
1831
1832 /*****************************************************************************
1833 * mos7840_set_termios
1834 * this function is called by the tty driver when it wants to change
1835 * the termios structure
1836 *****************************************************************************/
1837
mos7840_set_termios(struct tty_struct * tty,struct usb_serial_port * port,struct ktermios * old_termios)1838 static void mos7840_set_termios(struct tty_struct *tty,
1839 struct usb_serial_port *port,
1840 struct ktermios *old_termios)
1841 {
1842 int status;
1843 struct usb_serial *serial;
1844 struct moschip_port *mos7840_port;
1845
1846 if (mos7840_port_paranoia_check(port, __func__))
1847 return;
1848
1849 serial = port->serial;
1850
1851 if (mos7840_serial_paranoia_check(serial, __func__))
1852 return;
1853
1854 mos7840_port = mos7840_get_port_private(port);
1855
1856 if (mos7840_port == NULL)
1857 return;
1858
1859 if (!mos7840_port->open) {
1860 dev_dbg(&port->dev, "%s - port not opened\n", __func__);
1861 return;
1862 }
1863
1864 /* change the port settings to the new ones specified */
1865
1866 mos7840_change_port_settings(tty, mos7840_port, old_termios);
1867
1868 if (!mos7840_port->read_urb) {
1869 dev_dbg(&port->dev, "%s", "URB KILLED !!!!!\n");
1870 return;
1871 }
1872
1873 if (!mos7840_port->read_urb_busy) {
1874 mos7840_port->read_urb_busy = true;
1875 status = usb_submit_urb(mos7840_port->read_urb, GFP_KERNEL);
1876 if (status) {
1877 dev_dbg(&port->dev, "usb_submit_urb(read bulk) failed, status = %d\n",
1878 status);
1879 mos7840_port->read_urb_busy = false;
1880 }
1881 }
1882 }
1883
1884 /*****************************************************************************
1885 * mos7840_get_lsr_info - get line status register info
1886 *
1887 * Purpose: Let user call ioctl() to get info when the UART physically
1888 * is emptied. On bus types like RS485, the transmitter must
1889 * release the bus after transmitting. This must be done when
1890 * the transmit shift register is empty, not be done when the
1891 * transmit holding register is empty. This functionality
1892 * allows an RS485 driver to be written in user space.
1893 *****************************************************************************/
1894
mos7840_get_lsr_info(struct tty_struct * tty,unsigned int __user * value)1895 static int mos7840_get_lsr_info(struct tty_struct *tty,
1896 unsigned int __user *value)
1897 {
1898 int count;
1899 unsigned int result = 0;
1900
1901 count = mos7840_chars_in_buffer(tty);
1902 if (count == 0)
1903 result = TIOCSER_TEMT;
1904
1905 if (copy_to_user(value, &result, sizeof(int)))
1906 return -EFAULT;
1907 return 0;
1908 }
1909
1910 /*****************************************************************************
1911 * mos7840_get_serial_info
1912 * function to get information about serial port
1913 *****************************************************************************/
1914
mos7840_get_serial_info(struct tty_struct * tty,struct serial_struct * ss)1915 static int mos7840_get_serial_info(struct tty_struct *tty,
1916 struct serial_struct *ss)
1917 {
1918 struct usb_serial_port *port = tty->driver_data;
1919 struct moschip_port *mos7840_port = mos7840_get_port_private(port);
1920
1921 ss->type = PORT_16550A;
1922 ss->line = mos7840_port->port->minor;
1923 ss->port = mos7840_port->port->port_number;
1924 ss->irq = 0;
1925 ss->xmit_fifo_size = NUM_URBS * URB_TRANSFER_BUFFER_SIZE;
1926 ss->baud_base = 9600;
1927 ss->close_delay = 5 * HZ;
1928 ss->closing_wait = 30 * HZ;
1929 return 0;
1930 }
1931
1932 /*****************************************************************************
1933 * SerialIoctl
1934 * this function handles any ioctl calls to the driver
1935 *****************************************************************************/
1936
mos7840_ioctl(struct tty_struct * tty,unsigned int cmd,unsigned long arg)1937 static int mos7840_ioctl(struct tty_struct *tty,
1938 unsigned int cmd, unsigned long arg)
1939 {
1940 struct usb_serial_port *port = tty->driver_data;
1941 void __user *argp = (void __user *)arg;
1942 struct moschip_port *mos7840_port;
1943
1944 if (mos7840_port_paranoia_check(port, __func__))
1945 return -1;
1946
1947 mos7840_port = mos7840_get_port_private(port);
1948
1949 if (mos7840_port == NULL)
1950 return -1;
1951
1952 switch (cmd) {
1953 /* return number of bytes available */
1954
1955 case TIOCSERGETLSR:
1956 dev_dbg(&port->dev, "%s TIOCSERGETLSR\n", __func__);
1957 return mos7840_get_lsr_info(tty, argp);
1958
1959 default:
1960 break;
1961 }
1962 return -ENOIOCTLCMD;
1963 }
1964
mos7810_check(struct usb_serial * serial)1965 static int mos7810_check(struct usb_serial *serial)
1966 {
1967 int i, pass_count = 0;
1968 u8 *buf;
1969 __u16 data = 0, mcr_data = 0;
1970 __u16 test_pattern = 0x55AA;
1971 int res;
1972
1973 buf = kmalloc(VENDOR_READ_LENGTH, GFP_KERNEL);
1974 if (!buf)
1975 return 0; /* failed to identify 7810 */
1976
1977 /* Store MCR setting */
1978 res = usb_control_msg(serial->dev, usb_rcvctrlpipe(serial->dev, 0),
1979 MCS_RDREQ, MCS_RD_RTYPE, 0x0300, MODEM_CONTROL_REGISTER,
1980 buf, VENDOR_READ_LENGTH, MOS_WDR_TIMEOUT);
1981 if (res == VENDOR_READ_LENGTH)
1982 mcr_data = *buf;
1983
1984 for (i = 0; i < 16; i++) {
1985 /* Send the 1-bit test pattern out to MCS7810 test pin */
1986 usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0),
1987 MCS_WRREQ, MCS_WR_RTYPE,
1988 (0x0300 | (((test_pattern >> i) & 0x0001) << 1)),
1989 MODEM_CONTROL_REGISTER, NULL, 0, MOS_WDR_TIMEOUT);
1990
1991 /* Read the test pattern back */
1992 res = usb_control_msg(serial->dev,
1993 usb_rcvctrlpipe(serial->dev, 0), MCS_RDREQ,
1994 MCS_RD_RTYPE, 0, GPIO_REGISTER, buf,
1995 VENDOR_READ_LENGTH, MOS_WDR_TIMEOUT);
1996 if (res == VENDOR_READ_LENGTH)
1997 data = *buf;
1998
1999 /* If this is a MCS7810 device, both test patterns must match */
2000 if (((test_pattern >> i) ^ (~data >> 1)) & 0x0001)
2001 break;
2002
2003 pass_count++;
2004 }
2005
2006 /* Restore MCR setting */
2007 usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0), MCS_WRREQ,
2008 MCS_WR_RTYPE, 0x0300 | mcr_data, MODEM_CONTROL_REGISTER, NULL,
2009 0, MOS_WDR_TIMEOUT);
2010
2011 kfree(buf);
2012
2013 if (pass_count == 16)
2014 return 1;
2015
2016 return 0;
2017 }
2018
mos7840_probe(struct usb_serial * serial,const struct usb_device_id * id)2019 static int mos7840_probe(struct usb_serial *serial,
2020 const struct usb_device_id *id)
2021 {
2022 u16 product = le16_to_cpu(serial->dev->descriptor.idProduct);
2023 u8 *buf;
2024 int device_type;
2025
2026 if (product == MOSCHIP_DEVICE_ID_7810 ||
2027 product == MOSCHIP_DEVICE_ID_7820 ||
2028 product == MOSCHIP_DEVICE_ID_7843) {
2029 device_type = product;
2030 goto out;
2031 }
2032
2033 buf = kzalloc(VENDOR_READ_LENGTH, GFP_KERNEL);
2034 if (!buf)
2035 return -ENOMEM;
2036
2037 usb_control_msg(serial->dev, usb_rcvctrlpipe(serial->dev, 0),
2038 MCS_RDREQ, MCS_RD_RTYPE, 0, GPIO_REGISTER, buf,
2039 VENDOR_READ_LENGTH, MOS_WDR_TIMEOUT);
2040
2041 /* For a MCS7840 device GPIO0 must be set to 1 */
2042 if (buf[0] & 0x01)
2043 device_type = MOSCHIP_DEVICE_ID_7840;
2044 else if (mos7810_check(serial))
2045 device_type = MOSCHIP_DEVICE_ID_7810;
2046 else
2047 device_type = MOSCHIP_DEVICE_ID_7820;
2048
2049 kfree(buf);
2050 out:
2051 usb_set_serial_data(serial, (void *)(unsigned long)device_type);
2052
2053 return 0;
2054 }
2055
mos7840_calc_num_ports(struct usb_serial * serial,struct usb_serial_endpoints * epds)2056 static int mos7840_calc_num_ports(struct usb_serial *serial,
2057 struct usb_serial_endpoints *epds)
2058 {
2059 int device_type = (unsigned long)usb_get_serial_data(serial);
2060 int num_ports;
2061
2062 if (device_type == MOSCHIP_DEVICE_ID_7843)
2063 num_ports = 3;
2064 else
2065 num_ports = (device_type >> 4) & 0x000F;
2066
2067 /*
2068 * num_ports is currently never zero as device_type is one of
2069 * MOSCHIP_DEVICE_ID_78{1,2,4}0.
2070 */
2071 if (num_ports == 0)
2072 return -ENODEV;
2073
2074 if (epds->num_bulk_in < num_ports || epds->num_bulk_out < num_ports) {
2075 dev_err(&serial->interface->dev, "missing endpoints\n");
2076 return -ENODEV;
2077 }
2078
2079 return num_ports;
2080 }
2081
mos7840_port_probe(struct usb_serial_port * port)2082 static int mos7840_port_probe(struct usb_serial_port *port)
2083 {
2084 struct usb_serial *serial = port->serial;
2085 int device_type = (unsigned long)usb_get_serial_data(serial);
2086 struct moschip_port *mos7840_port;
2087 int status;
2088 int pnum;
2089 __u16 Data;
2090
2091 /* we set up the pointers to the endpoints in the mos7840_open *
2092 * function, as the structures aren't created yet. */
2093
2094 pnum = port->port_number;
2095
2096 dev_dbg(&port->dev, "mos7840_startup: configuring port %d\n", pnum);
2097 mos7840_port = kzalloc(sizeof(struct moschip_port), GFP_KERNEL);
2098 if (!mos7840_port)
2099 return -ENOMEM;
2100
2101 /* Initialize all port interrupt end point to port 0 int
2102 * endpoint. Our device has only one interrupt end point
2103 * common to all port */
2104
2105 mos7840_port->port = port;
2106 mos7840_set_port_private(port, mos7840_port);
2107 spin_lock_init(&mos7840_port->pool_lock);
2108
2109 /* minor is not initialised until later by
2110 * usb-serial.c:get_free_serial() and cannot therefore be used
2111 * to index device instances */
2112 mos7840_port->port_num = pnum + 1;
2113 dev_dbg(&port->dev, "port->minor = %d\n", port->minor);
2114 dev_dbg(&port->dev, "mos7840_port->port_num = %d\n", mos7840_port->port_num);
2115
2116 if (mos7840_port->port_num == 1) {
2117 mos7840_port->SpRegOffset = 0x0;
2118 mos7840_port->ControlRegOffset = 0x1;
2119 mos7840_port->DcrRegOffset = 0x4;
2120 } else {
2121 u8 phy_num = mos7840_port->port_num;
2122
2123 /* Port 2 in the 2-port case uses registers of port 3 */
2124 if (serial->num_ports == 2)
2125 phy_num = 3;
2126
2127 mos7840_port->SpRegOffset = 0x8 + 2 * (phy_num - 2);
2128 mos7840_port->ControlRegOffset = 0x9 + 2 * (phy_num - 2);
2129 mos7840_port->DcrRegOffset = 0x16 + 3 * (phy_num - 2);
2130 }
2131 mos7840_dump_serial_port(port, mos7840_port);
2132 mos7840_set_port_private(port, mos7840_port);
2133
2134 /* enable rx_disable bit in control register */
2135 status = mos7840_get_reg_sync(port,
2136 mos7840_port->ControlRegOffset, &Data);
2137 if (status < 0) {
2138 dev_dbg(&port->dev, "Reading ControlReg failed status-0x%x\n", status);
2139 goto out;
2140 } else
2141 dev_dbg(&port->dev, "ControlReg Reading success val is %x, status%d\n", Data, status);
2142 Data |= 0x08; /* setting driver done bit */
2143 Data |= 0x04; /* sp1_bit to have cts change reflect in
2144 modem status reg */
2145
2146 /* Data |= 0x20; //rx_disable bit */
2147 status = mos7840_set_reg_sync(port,
2148 mos7840_port->ControlRegOffset, Data);
2149 if (status < 0) {
2150 dev_dbg(&port->dev, "Writing ControlReg failed(rx_disable) status-0x%x\n", status);
2151 goto out;
2152 } else
2153 dev_dbg(&port->dev, "ControlReg Writing success(rx_disable) status%d\n", status);
2154
2155 /* Write default values in DCR (i.e 0x01 in DCR0, 0x05 in DCR2
2156 and 0x24 in DCR3 */
2157 Data = 0x01;
2158 status = mos7840_set_reg_sync(port,
2159 (__u16) (mos7840_port->DcrRegOffset + 0), Data);
2160 if (status < 0) {
2161 dev_dbg(&port->dev, "Writing DCR0 failed status-0x%x\n", status);
2162 goto out;
2163 } else
2164 dev_dbg(&port->dev, "DCR0 Writing success status%d\n", status);
2165
2166 Data = 0x05;
2167 status = mos7840_set_reg_sync(port,
2168 (__u16) (mos7840_port->DcrRegOffset + 1), Data);
2169 if (status < 0) {
2170 dev_dbg(&port->dev, "Writing DCR1 failed status-0x%x\n", status);
2171 goto out;
2172 } else
2173 dev_dbg(&port->dev, "DCR1 Writing success status%d\n", status);
2174
2175 Data = 0x24;
2176 status = mos7840_set_reg_sync(port,
2177 (__u16) (mos7840_port->DcrRegOffset + 2), Data);
2178 if (status < 0) {
2179 dev_dbg(&port->dev, "Writing DCR2 failed status-0x%x\n", status);
2180 goto out;
2181 } else
2182 dev_dbg(&port->dev, "DCR2 Writing success status%d\n", status);
2183
2184 /* write values in clkstart0x0 and clkmulti 0x20 */
2185 Data = 0x0;
2186 status = mos7840_set_reg_sync(port, CLK_START_VALUE_REGISTER, Data);
2187 if (status < 0) {
2188 dev_dbg(&port->dev, "Writing CLK_START_VALUE_REGISTER failed status-0x%x\n", status);
2189 goto out;
2190 } else
2191 dev_dbg(&port->dev, "CLK_START_VALUE_REGISTER Writing success status%d\n", status);
2192
2193 Data = 0x20;
2194 status = mos7840_set_reg_sync(port, CLK_MULTI_REGISTER, Data);
2195 if (status < 0) {
2196 dev_dbg(&port->dev, "Writing CLK_MULTI_REGISTER failed status-0x%x\n", status);
2197 goto error;
2198 } else
2199 dev_dbg(&port->dev, "CLK_MULTI_REGISTER Writing success status%d\n", status);
2200
2201 /* write value 0x0 to scratchpad register */
2202 Data = 0x00;
2203 status = mos7840_set_uart_reg(port, SCRATCH_PAD_REGISTER, Data);
2204 if (status < 0) {
2205 dev_dbg(&port->dev, "Writing SCRATCH_PAD_REGISTER failed status-0x%x\n", status);
2206 goto out;
2207 } else
2208 dev_dbg(&port->dev, "SCRATCH_PAD_REGISTER Writing success status%d\n", status);
2209
2210 /* Zero Length flag register */
2211 if ((mos7840_port->port_num != 1) && (serial->num_ports == 2)) {
2212 Data = 0xff;
2213 status = mos7840_set_reg_sync(port,
2214 (__u16) (ZLP_REG1 +
2215 ((__u16)mos7840_port->port_num)), Data);
2216 dev_dbg(&port->dev, "ZLIP offset %x\n",
2217 (__u16)(ZLP_REG1 + ((__u16) mos7840_port->port_num)));
2218 if (status < 0) {
2219 dev_dbg(&port->dev, "Writing ZLP_REG%d failed status-0x%x\n", pnum + 2, status);
2220 goto out;
2221 } else
2222 dev_dbg(&port->dev, "ZLP_REG%d Writing success status%d\n", pnum + 2, status);
2223 } else {
2224 Data = 0xff;
2225 status = mos7840_set_reg_sync(port,
2226 (__u16) (ZLP_REG1 +
2227 ((__u16)mos7840_port->port_num) - 0x1), Data);
2228 dev_dbg(&port->dev, "ZLIP offset %x\n",
2229 (__u16)(ZLP_REG1 + ((__u16) mos7840_port->port_num) - 0x1));
2230 if (status < 0) {
2231 dev_dbg(&port->dev, "Writing ZLP_REG%d failed status-0x%x\n", pnum + 1, status);
2232 goto out;
2233 } else
2234 dev_dbg(&port->dev, "ZLP_REG%d Writing success status%d\n", pnum + 1, status);
2235
2236 }
2237 mos7840_port->control_urb = usb_alloc_urb(0, GFP_KERNEL);
2238 mos7840_port->ctrl_buf = kmalloc(16, GFP_KERNEL);
2239 mos7840_port->dr = kmalloc(sizeof(struct usb_ctrlrequest),
2240 GFP_KERNEL);
2241 if (!mos7840_port->control_urb || !mos7840_port->ctrl_buf ||
2242 !mos7840_port->dr) {
2243 status = -ENOMEM;
2244 goto error;
2245 }
2246
2247 mos7840_port->has_led = false;
2248
2249 /* Initialize LED timers */
2250 if (device_type == MOSCHIP_DEVICE_ID_7810) {
2251 mos7840_port->has_led = true;
2252
2253 mos7840_port->led_urb = usb_alloc_urb(0, GFP_KERNEL);
2254 mos7840_port->led_dr = kmalloc(sizeof(*mos7840_port->led_dr),
2255 GFP_KERNEL);
2256 if (!mos7840_port->led_urb || !mos7840_port->led_dr) {
2257 status = -ENOMEM;
2258 goto error;
2259 }
2260
2261 timer_setup(&mos7840_port->led_timer1, mos7840_led_off, 0);
2262 mos7840_port->led_timer1.expires =
2263 jiffies + msecs_to_jiffies(LED_ON_MS);
2264 timer_setup(&mos7840_port->led_timer2, mos7840_led_flag_off,
2265 0);
2266 mos7840_port->led_timer2.expires =
2267 jiffies + msecs_to_jiffies(LED_OFF_MS);
2268
2269 /* Turn off LED */
2270 mos7840_set_led_sync(port, MODEM_CONTROL_REGISTER, 0x0300);
2271 }
2272 out:
2273 if (pnum == serial->num_ports - 1) {
2274 /* Zero Length flag enable */
2275 Data = 0x0f;
2276 status = mos7840_set_reg_sync(serial->port[0], ZLP_REG5, Data);
2277 if (status < 0) {
2278 dev_dbg(&port->dev, "Writing ZLP_REG5 failed status-0x%x\n", status);
2279 goto error;
2280 } else
2281 dev_dbg(&port->dev, "ZLP_REG5 Writing success status%d\n", status);
2282
2283 /* setting configuration feature to one */
2284 usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0),
2285 0x03, 0x00, 0x01, 0x00, NULL, 0x00,
2286 MOS_WDR_TIMEOUT);
2287 }
2288 return 0;
2289 error:
2290 kfree(mos7840_port->led_dr);
2291 usb_free_urb(mos7840_port->led_urb);
2292 kfree(mos7840_port->dr);
2293 kfree(mos7840_port->ctrl_buf);
2294 usb_free_urb(mos7840_port->control_urb);
2295 kfree(mos7840_port);
2296
2297 return status;
2298 }
2299
mos7840_port_remove(struct usb_serial_port * port)2300 static int mos7840_port_remove(struct usb_serial_port *port)
2301 {
2302 struct moschip_port *mos7840_port;
2303
2304 mos7840_port = mos7840_get_port_private(port);
2305
2306 if (mos7840_port->has_led) {
2307 /* Turn off LED */
2308 mos7840_set_led_sync(port, MODEM_CONTROL_REGISTER, 0x0300);
2309
2310 del_timer_sync(&mos7840_port->led_timer1);
2311 del_timer_sync(&mos7840_port->led_timer2);
2312
2313 usb_kill_urb(mos7840_port->led_urb);
2314 usb_free_urb(mos7840_port->led_urb);
2315 kfree(mos7840_port->led_dr);
2316 }
2317 usb_kill_urb(mos7840_port->control_urb);
2318 usb_free_urb(mos7840_port->control_urb);
2319 kfree(mos7840_port->ctrl_buf);
2320 kfree(mos7840_port->dr);
2321 kfree(mos7840_port);
2322
2323 return 0;
2324 }
2325
2326 static struct usb_serial_driver moschip7840_4port_device = {
2327 .driver = {
2328 .owner = THIS_MODULE,
2329 .name = "mos7840",
2330 },
2331 .description = DRIVER_DESC,
2332 .id_table = id_table,
2333 .num_interrupt_in = 1,
2334 .open = mos7840_open,
2335 .close = mos7840_close,
2336 .write = mos7840_write,
2337 .write_room = mos7840_write_room,
2338 .chars_in_buffer = mos7840_chars_in_buffer,
2339 .throttle = mos7840_throttle,
2340 .unthrottle = mos7840_unthrottle,
2341 .calc_num_ports = mos7840_calc_num_ports,
2342 .probe = mos7840_probe,
2343 .ioctl = mos7840_ioctl,
2344 .get_serial = mos7840_get_serial_info,
2345 .set_termios = mos7840_set_termios,
2346 .break_ctl = mos7840_break,
2347 .tiocmget = mos7840_tiocmget,
2348 .tiocmset = mos7840_tiocmset,
2349 .tiocmiwait = usb_serial_generic_tiocmiwait,
2350 .get_icount = usb_serial_generic_get_icount,
2351 .port_probe = mos7840_port_probe,
2352 .port_remove = mos7840_port_remove,
2353 .read_bulk_callback = mos7840_bulk_in_callback,
2354 .read_int_callback = mos7840_interrupt_callback,
2355 };
2356
2357 static struct usb_serial_driver * const serial_drivers[] = {
2358 &moschip7840_4port_device, NULL
2359 };
2360
2361 module_usb_serial_driver(serial_drivers, id_table);
2362
2363 MODULE_DESCRIPTION(DRIVER_DESC);
2364 MODULE_LICENSE("GPL");
2365
