2 * USB Cypress M8 driver
5 * Lonnie Mendez (dignome@gmail.com)
6 * Copyright (C) 2003,2004
7 * Neil Whelchel (koyama@firstlight.net)
9 * This program is free software; you can redistribute it and/or modify
10 * it under the terms of the GNU General Public License as published by
11 * the Free Software Foundation; either version 2 of the License, or
12 * (at your option) any later version.
14 * See Documentation/usb/usb-serial.txt for more information on using this
17 * See http://geocities.com/i0xox0i for information on this driver and the
18 * earthmate usb device.
20 * Lonnie Mendez <dignome@gmail.com>
22 * Fixed problem where setting or retreiving the serial config would fail
23 * with EPIPE. Removed CRTS toggling so the driver behaves more like
24 * other usbserial adapters. Issued new interval of 1ms instead of the
25 * default 10ms. As a result, transfer speed has been substantially
26 * increased from avg. 850bps to avg. 3300bps. initial termios has also
27 * been modified. Cleaned up code and formatting issues so it is more
28 * readable. Replaced the C++ style comments.
30 * Lonnie Mendez <dignome@gmail.com>
32 * Incorporated write buffering from pl2303 driver. Fixed bug with line
33 * handling so both lines are raised in cypress_open. (was dropping rts)
34 * Various code cleanups made as well along with other misc bug fixes.
36 * Lonnie Mendez <dignome@gmail.com>
38 * Driver modified to support dynamic line settings. Various improvments
43 * Driver first released.
47 /* Thanks to Neil Whelchel for writing the first cypress m8 implementation
49 /* Thanks to cypress for providing references for the hid reports. */
50 /* Thanks to Jiang Zhang for providing links and for general help. */
51 /* Code originates and was built up from ftdi_sio, belkin, pl2303 and others.*/
54 #include <linux/kernel.h>
55 #include <linux/errno.h>
56 #include <linux/init.h>
57 #include <linux/slab.h>
58 #include <linux/tty.h>
59 #include <linux/tty_driver.h>
60 #include <linux/tty_flip.h>
61 #include <linux/module.h>
62 #include <linux/moduleparam.h>
63 #include <linux/spinlock.h>
64 #include <linux/usb.h>
65 #include <linux/usb/serial.h>
66 #include <linux/serial.h>
67 #include <linux/delay.h>
68 #include <linux/uaccess.h>
70 #include "cypress_m8.h"
73 #ifdef CONFIG_USB_SERIAL_DEBUG
84 #define DRIVER_VERSION "v1.09"
85 #define DRIVER_AUTHOR "Lonnie Mendez <dignome@gmail.com>, Neil Whelchel <koyama@firstlight.net>"
86 #define DRIVER_DESC "Cypress USB to Serial Driver"
88 /* write buffer size defines */
89 #define CYPRESS_BUF_SIZE 1024
90 #define CYPRESS_CLOSING_WAIT (30*HZ)
92 static struct usb_device_id id_table_earthmate
[] = {
93 { USB_DEVICE(VENDOR_ID_DELORME
, PRODUCT_ID_EARTHMATEUSB
) },
94 { USB_DEVICE(VENDOR_ID_DELORME
, PRODUCT_ID_EARTHMATEUSB_LT20
) },
95 { } /* Terminating entry */
98 static struct usb_device_id id_table_cyphidcomrs232
[] = {
99 { USB_DEVICE(VENDOR_ID_CYPRESS
, PRODUCT_ID_CYPHIDCOM
) },
100 { USB_DEVICE(VENDOR_ID_POWERCOM
, PRODUCT_ID_UPS
) },
101 { } /* Terminating entry */
104 static struct usb_device_id id_table_nokiaca42v2
[] = {
105 { USB_DEVICE(VENDOR_ID_DAZZLE
, PRODUCT_ID_CA42
) },
106 { } /* Terminating entry */
109 static struct usb_device_id id_table_combined
[] = {
110 { USB_DEVICE(VENDOR_ID_DELORME
, PRODUCT_ID_EARTHMATEUSB
) },
111 { USB_DEVICE(VENDOR_ID_DELORME
, PRODUCT_ID_EARTHMATEUSB_LT20
) },
112 { USB_DEVICE(VENDOR_ID_CYPRESS
, PRODUCT_ID_CYPHIDCOM
) },
113 { USB_DEVICE(VENDOR_ID_POWERCOM
, PRODUCT_ID_UPS
) },
114 { USB_DEVICE(VENDOR_ID_DAZZLE
, PRODUCT_ID_CA42
) },
115 { } /* Terminating entry */
118 MODULE_DEVICE_TABLE(usb
, id_table_combined
);
120 static struct usb_driver cypress_driver
= {
122 .probe
= usb_serial_probe
,
123 .disconnect
= usb_serial_disconnect
,
124 .id_table
= id_table_combined
,
129 packet_format_1
, /* b0:status, b1:payload count */
130 packet_format_2
/* b0[7:3]:status, b0[2:0]:payload count */
133 struct cypress_private
{
134 spinlock_t lock
; /* private lock */
135 int chiptype
; /* identifier of device, for quirks/etc */
136 int bytes_in
; /* used for statistics */
137 int bytes_out
; /* used for statistics */
138 int cmd_count
; /* used for statistics */
139 int cmd_ctrl
; /* always set this to 1 before issuing a command */
140 struct cypress_buf
*buf
; /* write buffer */
141 int write_urb_in_use
; /* write urb in use indicator */
142 int write_urb_interval
; /* interval to use for write urb */
143 int read_urb_interval
; /* interval to use for read urb */
144 int comm_is_ok
; /* true if communication is (still) ok */
145 int termios_initialized
;
146 __u8 line_control
; /* holds dtr / rts value */
147 __u8 current_status
; /* received from last read - info on dsr,cts,cd,ri,etc */
148 __u8 current_config
; /* stores the current configuration byte */
149 __u8 rx_flags
; /* throttling - used from whiteheat/ftdi_sio */
150 enum packet_format pkt_fmt
; /* format to use for packet send / receive */
151 int get_cfg_unsafe
; /* If true, the CYPRESS_GET_CONFIG is unsafe */
152 int baud_rate
; /* stores current baud rate in
154 int isthrottled
; /* if throttled, discard reads */
155 wait_queue_head_t delta_msr_wait
; /* used for TIOCMIWAIT */
156 char prev_status
, diff_status
; /* used for TIOCMIWAIT */
157 /* we pass a pointer to this as the arguement sent to
158 cypress_set_termios old_termios */
159 struct ktermios tmp_termios
; /* stores the old termios settings */
162 /* write buffer structure */
164 unsigned int buf_size
;
170 /* function prototypes for the Cypress USB to serial device */
171 static int cypress_earthmate_startup(struct usb_serial
*serial
);
172 static int cypress_hidcom_startup(struct usb_serial
*serial
);
173 static int cypress_ca42v2_startup(struct usb_serial
*serial
);
174 static void cypress_release(struct usb_serial
*serial
);
175 static int cypress_open(struct tty_struct
*tty
,
176 struct usb_serial_port
*port
, struct file
*filp
);
177 static void cypress_close(struct usb_serial_port
*port
);
178 static void cypress_dtr_rts(struct usb_serial_port
*port
, int on
);
179 static int cypress_write(struct tty_struct
*tty
, struct usb_serial_port
*port
,
180 const unsigned char *buf
, int count
);
181 static void cypress_send(struct usb_serial_port
*port
);
182 static int cypress_write_room(struct tty_struct
*tty
);
183 static int cypress_ioctl(struct tty_struct
*tty
, struct file
*file
,
184 unsigned int cmd
, unsigned long arg
);
185 static void cypress_set_termios(struct tty_struct
*tty
,
186 struct usb_serial_port
*port
, struct ktermios
*old
);
187 static int cypress_tiocmget(struct tty_struct
*tty
, struct file
*file
);
188 static int cypress_tiocmset(struct tty_struct
*tty
, struct file
*file
,
189 unsigned int set
, unsigned int clear
);
190 static int cypress_chars_in_buffer(struct tty_struct
*tty
);
191 static void cypress_throttle(struct tty_struct
*tty
);
192 static void cypress_unthrottle(struct tty_struct
*tty
);
193 static void cypress_set_dead(struct usb_serial_port
*port
);
194 static void cypress_read_int_callback(struct urb
*urb
);
195 static void cypress_write_int_callback(struct urb
*urb
);
196 /* write buffer functions */
197 static struct cypress_buf
*cypress_buf_alloc(unsigned int size
);
198 static void cypress_buf_free(struct cypress_buf
*cb
);
199 static void cypress_buf_clear(struct cypress_buf
*cb
);
200 static unsigned int cypress_buf_data_avail(struct cypress_buf
*cb
);
201 static unsigned int cypress_buf_space_avail(struct cypress_buf
*cb
);
202 static unsigned int cypress_buf_put(struct cypress_buf
*cb
,
203 const char *buf
, unsigned int count
);
204 static unsigned int cypress_buf_get(struct cypress_buf
*cb
,
205 char *buf
, unsigned int count
);
208 static struct usb_serial_driver cypress_earthmate_device
= {
210 .owner
= THIS_MODULE
,
213 .description
= "DeLorme Earthmate USB",
214 .usb_driver
= &cypress_driver
,
215 .id_table
= id_table_earthmate
,
217 .attach
= cypress_earthmate_startup
,
218 .release
= cypress_release
,
219 .open
= cypress_open
,
220 .close
= cypress_close
,
221 .dtr_rts
= cypress_dtr_rts
,
222 .write
= cypress_write
,
223 .write_room
= cypress_write_room
,
224 .ioctl
= cypress_ioctl
,
225 .set_termios
= cypress_set_termios
,
226 .tiocmget
= cypress_tiocmget
,
227 .tiocmset
= cypress_tiocmset
,
228 .chars_in_buffer
= cypress_chars_in_buffer
,
229 .throttle
= cypress_throttle
,
230 .unthrottle
= cypress_unthrottle
,
231 .read_int_callback
= cypress_read_int_callback
,
232 .write_int_callback
= cypress_write_int_callback
,
235 static struct usb_serial_driver cypress_hidcom_device
= {
237 .owner
= THIS_MODULE
,
240 .description
= "HID->COM RS232 Adapter",
241 .usb_driver
= &cypress_driver
,
242 .id_table
= id_table_cyphidcomrs232
,
244 .attach
= cypress_hidcom_startup
,
245 .release
= cypress_release
,
246 .open
= cypress_open
,
247 .close
= cypress_close
,
248 .dtr_rts
= cypress_dtr_rts
,
249 .write
= cypress_write
,
250 .write_room
= cypress_write_room
,
251 .ioctl
= cypress_ioctl
,
252 .set_termios
= cypress_set_termios
,
253 .tiocmget
= cypress_tiocmget
,
254 .tiocmset
= cypress_tiocmset
,
255 .chars_in_buffer
= cypress_chars_in_buffer
,
256 .throttle
= cypress_throttle
,
257 .unthrottle
= cypress_unthrottle
,
258 .read_int_callback
= cypress_read_int_callback
,
259 .write_int_callback
= cypress_write_int_callback
,
262 static struct usb_serial_driver cypress_ca42v2_device
= {
264 .owner
= THIS_MODULE
,
265 .name
= "nokiaca42v2",
267 .description
= "Nokia CA-42 V2 Adapter",
268 .usb_driver
= &cypress_driver
,
269 .id_table
= id_table_nokiaca42v2
,
271 .attach
= cypress_ca42v2_startup
,
272 .release
= cypress_release
,
273 .open
= cypress_open
,
274 .close
= cypress_close
,
275 .dtr_rts
= cypress_dtr_rts
,
276 .write
= cypress_write
,
277 .write_room
= cypress_write_room
,
278 .ioctl
= cypress_ioctl
,
279 .set_termios
= cypress_set_termios
,
280 .tiocmget
= cypress_tiocmget
,
281 .tiocmset
= cypress_tiocmset
,
282 .chars_in_buffer
= cypress_chars_in_buffer
,
283 .throttle
= cypress_throttle
,
284 .unthrottle
= cypress_unthrottle
,
285 .read_int_callback
= cypress_read_int_callback
,
286 .write_int_callback
= cypress_write_int_callback
,
289 /*****************************************************************************
290 * Cypress serial helper functions
291 *****************************************************************************/
294 static int analyze_baud_rate(struct usb_serial_port
*port
, speed_t new_rate
)
296 struct cypress_private
*priv
;
297 priv
= usb_get_serial_port_data(port
);
300 * The general purpose firmware for the Cypress M8 allows for
301 * a maximum speed of 57600bps (I have no idea whether DeLorme
302 * chose to use the general purpose firmware or not), if you
303 * need to modify this speed setting for your own project
304 * please add your own chiptype and modify the code likewise.
305 * The Cypress HID->COM device will work successfully up to
306 * 115200bps (but the actual throughput is around 3kBps).
308 if (port
->serial
->dev
->speed
== USB_SPEED_LOW
) {
310 * Mike Isely <isely@pobox.com> 2-Feb-2008: The
311 * Cypress app note that describes this mechanism
312 * states the the low-speed part can't handle more
313 * than 800 bytes/sec, in which case 4800 baud is the
314 * safest speed for a part like that.
316 if (new_rate
> 4800) {
317 dbg("%s - failed setting baud rate, device incapable "
318 "speed %d", __func__
, new_rate
);
322 switch (priv
->chiptype
) {
324 if (new_rate
<= 600) {
325 /* 300 and 600 baud rates are supported under
326 * the generic firmware, but are not used with
327 * NMEA and SiRF protocols */
328 dbg("%s - failed setting baud rate, unsupported speed "
329 "of %d on Earthmate GPS", __func__
, new_rate
);
340 /* This function can either set or retrieve the current serial line settings */
341 static int cypress_serial_control(struct tty_struct
*tty
,
342 struct usb_serial_port
*port
, speed_t baud_rate
, int data_bits
,
343 int stop_bits
, int parity_enable
, int parity_type
, int reset
,
344 int cypress_request_type
)
346 int new_baudrate
= 0, retval
= 0, tries
= 0;
347 struct cypress_private
*priv
;
348 __u8 feature_buffer
[5];
353 priv
= usb_get_serial_port_data(port
);
355 if (!priv
->comm_is_ok
)
358 switch (cypress_request_type
) {
359 case CYPRESS_SET_CONFIG
:
360 new_baudrate
= priv
->baud_rate
;
361 /* 0 means 'Hang up' so doesn't change the true bit rate */
363 new_baudrate
= priv
->baud_rate
;
364 /* Change of speed ? */
365 else if (baud_rate
!= priv
->baud_rate
) {
366 dbg("%s - baud rate is changing", __func__
);
367 retval
= analyze_baud_rate(port
, baud_rate
);
369 new_baudrate
= retval
;
370 dbg("%s - New baud rate set to %d",
371 __func__
, new_baudrate
);
374 dbg("%s - baud rate is being sent as %d",
375 __func__
, new_baudrate
);
377 memset(feature_buffer
, 0, sizeof(feature_buffer
));
378 /* fill the feature_buffer with new configuration */
379 *((u_int32_t
*)feature_buffer
) = new_baudrate
;
380 feature_buffer
[4] |= data_bits
; /* assign data bits in 2 bit space ( max 3 ) */
382 feature_buffer
[4] |= (stop_bits
<< 3); /* assign stop bits in 1 bit space */
383 feature_buffer
[4] |= (parity_enable
<< 4); /* assign parity flag in 1 bit space */
384 feature_buffer
[4] |= (parity_type
<< 5); /* assign parity type in 1 bit space */
386 feature_buffer
[4] |= (reset
<< 7); /* assign reset at end of byte, 1 bit space */
388 dbg("%s - device is being sent this feature report:",
390 dbg("%s - %02X - %02X - %02X - %02X - %02X", __func__
,
391 feature_buffer
[0], feature_buffer
[1],
392 feature_buffer
[2], feature_buffer
[3],
396 retval
= usb_control_msg(port
->serial
->dev
,
397 usb_sndctrlpipe(port
->serial
->dev
, 0),
399 USB_DIR_OUT
| USB_RECIP_INTERFACE
| USB_TYPE_CLASS
,
400 0x0300, 0, feature_buffer
,
401 sizeof(feature_buffer
), 500);
406 } while (retval
!= sizeof(feature_buffer
) &&
409 if (retval
!= sizeof(feature_buffer
)) {
410 dev_err(&port
->dev
, "%s - failed sending serial "
411 "line settings - %d\n", __func__
, retval
);
412 cypress_set_dead(port
);
414 spin_lock_irqsave(&priv
->lock
, flags
);
415 priv
->baud_rate
= new_baudrate
;
416 priv
->current_config
= feature_buffer
[4];
417 spin_unlock_irqrestore(&priv
->lock
, flags
);
418 /* If we asked for a speed change encode it */
420 tty_encode_baud_rate(tty
,
421 new_baudrate
, new_baudrate
);
424 case CYPRESS_GET_CONFIG
:
425 if (priv
->get_cfg_unsafe
) {
426 /* Not implemented for this device,
427 and if we try to do it we're likely
428 to crash the hardware. */
431 dbg("%s - retreiving serial line settings", __func__
);
432 /* set initial values in feature buffer */
433 memset(feature_buffer
, 0, sizeof(feature_buffer
));
436 retval
= usb_control_msg(port
->serial
->dev
,
437 usb_rcvctrlpipe(port
->serial
->dev
, 0),
439 USB_DIR_IN
| USB_RECIP_INTERFACE
| USB_TYPE_CLASS
,
440 0x0300, 0, feature_buffer
,
441 sizeof(feature_buffer
), 500);
445 } while (retval
!= sizeof(feature_buffer
)
446 && retval
!= -ENODEV
);
448 if (retval
!= sizeof(feature_buffer
)) {
449 dev_err(&port
->dev
, "%s - failed to retrieve serial "
450 "line settings - %d\n", __func__
, retval
);
451 cypress_set_dead(port
);
454 spin_lock_irqsave(&priv
->lock
, flags
);
455 /* store the config in one byte, and later
456 use bit masks to check values */
457 priv
->current_config
= feature_buffer
[4];
458 priv
->baud_rate
= *((u_int32_t
*)feature_buffer
);
459 spin_unlock_irqrestore(&priv
->lock
, flags
);
462 spin_lock_irqsave(&priv
->lock
, flags
);
464 spin_unlock_irqrestore(&priv
->lock
, flags
);
467 } /* cypress_serial_control */
470 static void cypress_set_dead(struct usb_serial_port
*port
)
472 struct cypress_private
*priv
= usb_get_serial_port_data(port
);
475 spin_lock_irqsave(&priv
->lock
, flags
);
476 if (!priv
->comm_is_ok
) {
477 spin_unlock_irqrestore(&priv
->lock
, flags
);
480 priv
->comm_is_ok
= 0;
481 spin_unlock_irqrestore(&priv
->lock
, flags
);
483 dev_err(&port
->dev
, "cypress_m8 suspending failing port %d - "
484 "interval might be too short\n", port
->number
);
488 /*****************************************************************************
489 * Cypress serial driver functions
490 *****************************************************************************/
493 static int generic_startup(struct usb_serial
*serial
)
495 struct cypress_private
*priv
;
496 struct usb_serial_port
*port
= serial
->port
[0];
498 dbg("%s - port %d", __func__
, port
->number
);
500 priv
= kzalloc(sizeof(struct cypress_private
), GFP_KERNEL
);
504 priv
->comm_is_ok
= !0;
505 spin_lock_init(&priv
->lock
);
506 priv
->buf
= cypress_buf_alloc(CYPRESS_BUF_SIZE
);
507 if (priv
->buf
== NULL
) {
511 init_waitqueue_head(&priv
->delta_msr_wait
);
513 usb_reset_configuration(serial
->dev
);
516 priv
->line_control
= 0;
517 priv
->termios_initialized
= 0;
519 /* Default packet format setting is determined by packet size.
520 Anything with a size larger then 9 must have a separate
521 count field since the 3 bit count field is otherwise too
522 small. Otherwise we can use the slightly more compact
523 format. This is in accordance with the cypress_m8 serial
524 converter app note. */
525 if (port
->interrupt_out_size
> 9)
526 priv
->pkt_fmt
= packet_format_1
;
528 priv
->pkt_fmt
= packet_format_2
;
531 priv
->write_urb_interval
= interval
;
532 priv
->read_urb_interval
= interval
;
533 dbg("%s - port %d read & write intervals forced to %d",
534 __func__
, port
->number
, interval
);
536 priv
->write_urb_interval
= port
->interrupt_out_urb
->interval
;
537 priv
->read_urb_interval
= port
->interrupt_in_urb
->interval
;
538 dbg("%s - port %d intervals: read=%d write=%d",
539 __func__
, port
->number
,
540 priv
->read_urb_interval
, priv
->write_urb_interval
);
542 usb_set_serial_port_data(port
, priv
);
548 static int cypress_earthmate_startup(struct usb_serial
*serial
)
550 struct cypress_private
*priv
;
551 struct usb_serial_port
*port
= serial
->port
[0];
555 if (generic_startup(serial
)) {
556 dbg("%s - Failed setting up port %d", __func__
,
561 priv
= usb_get_serial_port_data(port
);
562 priv
->chiptype
= CT_EARTHMATE
;
563 /* All Earthmate devices use the separated-count packet
565 priv
->pkt_fmt
= packet_format_1
;
566 if (serial
->dev
->descriptor
.idProduct
!=
567 cpu_to_le16(PRODUCT_ID_EARTHMATEUSB
)) {
568 /* The old original USB Earthmate seemed able to
569 handle GET_CONFIG requests; everything they've
570 produced since that time crashes if this command is
572 dbg("%s - Marking this device as unsafe for GET_CONFIG "
573 "commands", __func__
);
574 priv
->get_cfg_unsafe
= !0;
578 } /* cypress_earthmate_startup */
581 static int cypress_hidcom_startup(struct usb_serial
*serial
)
583 struct cypress_private
*priv
;
587 if (generic_startup(serial
)) {
588 dbg("%s - Failed setting up port %d", __func__
,
589 serial
->port
[0]->number
);
593 priv
= usb_get_serial_port_data(serial
->port
[0]);
594 priv
->chiptype
= CT_CYPHIDCOM
;
597 } /* cypress_hidcom_startup */
600 static int cypress_ca42v2_startup(struct usb_serial
*serial
)
602 struct cypress_private
*priv
;
606 if (generic_startup(serial
)) {
607 dbg("%s - Failed setting up port %d", __func__
,
608 serial
->port
[0]->number
);
612 priv
= usb_get_serial_port_data(serial
->port
[0]);
613 priv
->chiptype
= CT_CA42V2
;
616 } /* cypress_ca42v2_startup */
619 static void cypress_release(struct usb_serial
*serial
)
621 struct cypress_private
*priv
;
623 dbg("%s - port %d", __func__
, serial
->port
[0]->number
);
625 /* all open ports are closed at this point */
627 priv
= usb_get_serial_port_data(serial
->port
[0]);
630 cypress_buf_free(priv
->buf
);
636 static int cypress_open(struct tty_struct
*tty
,
637 struct usb_serial_port
*port
, struct file
*filp
)
639 struct cypress_private
*priv
= usb_get_serial_port_data(port
);
640 struct usb_serial
*serial
= port
->serial
;
644 dbg("%s - port %d", __func__
, port
->number
);
646 if (!priv
->comm_is_ok
)
649 /* clear halts before open */
650 usb_clear_halt(serial
->dev
, 0x81);
651 usb_clear_halt(serial
->dev
, 0x02);
653 spin_lock_irqsave(&priv
->lock
, flags
);
654 /* reset read/write statistics */
659 spin_unlock_irqrestore(&priv
->lock
, flags
);
662 result
= cypress_write(tty
, port
, NULL
, 0);
666 "%s - failed setting the control lines - error %d\n",
670 dbg("%s - success setting the control lines", __func__
);
673 cypress_set_termios(tty
, port
, &priv
->tmp_termios
);
675 /* setup the port and start reading from the device */
676 if (!port
->interrupt_in_urb
) {
677 dev_err(&port
->dev
, "%s - interrupt_in_urb is empty!\n",
682 usb_fill_int_urb(port
->interrupt_in_urb
, serial
->dev
,
683 usb_rcvintpipe(serial
->dev
, port
->interrupt_in_endpointAddress
),
684 port
->interrupt_in_urb
->transfer_buffer
,
685 port
->interrupt_in_urb
->transfer_buffer_length
,
686 cypress_read_int_callback
, port
, priv
->read_urb_interval
);
687 result
= usb_submit_urb(port
->interrupt_in_urb
, GFP_KERNEL
);
691 "%s - failed submitting read urb, error %d\n",
693 cypress_set_dead(port
);
695 port
->port
.drain_delay
= 256;
699 static void cypress_dtr_rts(struct usb_serial_port
*port
, int on
)
701 struct cypress_private
*priv
= usb_get_serial_port_data(port
);
702 /* drop dtr and rts */
703 priv
= usb_get_serial_port_data(port
);
704 spin_lock_irq(&priv
->lock
);
706 priv
->line_control
= 0;
708 priv
->line_control
= CONTROL_DTR
| CONTROL_RTS
;
710 spin_unlock_irq(&priv
->lock
);
711 cypress_write(NULL
, port
, NULL
, 0);
714 static void cypress_close(struct usb_serial_port
*port
)
716 struct cypress_private
*priv
= usb_get_serial_port_data(port
);
718 dbg("%s - port %d", __func__
, port
->number
);
720 /* writing is potentially harmful, lock must be taken */
721 mutex_lock(&port
->serial
->disc_mutex
);
722 if (port
->serial
->disconnected
) {
723 mutex_unlock(&port
->serial
->disc_mutex
);
726 cypress_buf_clear(priv
->buf
);
727 dbg("%s - stopping urbs", __func__
);
728 usb_kill_urb(port
->interrupt_in_urb
);
729 usb_kill_urb(port
->interrupt_out_urb
);
733 dev_info(&port
->dev
, "Statistics: %d Bytes In | %d Bytes Out | %d Commands Issued\n",
734 priv
->bytes_in
, priv
->bytes_out
, priv
->cmd_count
);
735 mutex_unlock(&port
->serial
->disc_mutex
);
736 } /* cypress_close */
739 static int cypress_write(struct tty_struct
*tty
, struct usb_serial_port
*port
,
740 const unsigned char *buf
, int count
)
742 struct cypress_private
*priv
= usb_get_serial_port_data(port
);
745 dbg("%s - port %d, %d bytes", __func__
, port
->number
, count
);
747 /* line control commands, which need to be executed immediately,
748 are not put into the buffer for obvious reasons.
750 if (priv
->cmd_ctrl
) {
758 spin_lock_irqsave(&priv
->lock
, flags
);
759 count
= cypress_buf_put(priv
->buf
, buf
, count
);
760 spin_unlock_irqrestore(&priv
->lock
, flags
);
766 } /* cypress_write */
769 static void cypress_send(struct usb_serial_port
*port
)
771 int count
= 0, result
, offset
, actual_size
;
772 struct cypress_private
*priv
= usb_get_serial_port_data(port
);
775 if (!priv
->comm_is_ok
)
778 dbg("%s - port %d", __func__
, port
->number
);
779 dbg("%s - interrupt out size is %d", __func__
,
780 port
->interrupt_out_size
);
782 spin_lock_irqsave(&priv
->lock
, flags
);
783 if (priv
->write_urb_in_use
) {
784 dbg("%s - can't write, urb in use", __func__
);
785 spin_unlock_irqrestore(&priv
->lock
, flags
);
788 spin_unlock_irqrestore(&priv
->lock
, flags
);
791 memset(port
->interrupt_out_urb
->transfer_buffer
, 0,
792 port
->interrupt_out_size
);
794 spin_lock_irqsave(&priv
->lock
, flags
);
795 switch (priv
->pkt_fmt
) {
797 case packet_format_1
:
798 /* this is for the CY7C64013... */
800 port
->interrupt_out_buffer
[0] = priv
->line_control
;
802 case packet_format_2
:
803 /* this is for the CY7C63743... */
805 port
->interrupt_out_buffer
[0] = priv
->line_control
;
809 if (priv
->line_control
& CONTROL_RESET
)
810 priv
->line_control
&= ~CONTROL_RESET
;
812 if (priv
->cmd_ctrl
) {
814 dbg("%s - line control command being issued", __func__
);
815 spin_unlock_irqrestore(&priv
->lock
, flags
);
818 spin_unlock_irqrestore(&priv
->lock
, flags
);
820 count
= cypress_buf_get(priv
->buf
, &port
->interrupt_out_buffer
[offset
],
821 port
->interrupt_out_size
-offset
);
826 switch (priv
->pkt_fmt
) {
828 case packet_format_1
:
829 port
->interrupt_out_buffer
[1] = count
;
831 case packet_format_2
:
832 port
->interrupt_out_buffer
[0] |= count
;
835 dbg("%s - count is %d", __func__
, count
);
838 spin_lock_irqsave(&priv
->lock
, flags
);
839 priv
->write_urb_in_use
= 1;
840 spin_unlock_irqrestore(&priv
->lock
, flags
);
845 actual_size
= count
+
846 (priv
->pkt_fmt
== packet_format_1
? 2 : 1);
848 usb_serial_debug_data(debug
, &port
->dev
, __func__
,
849 port
->interrupt_out_size
,
850 port
->interrupt_out_urb
->transfer_buffer
);
852 usb_fill_int_urb(port
->interrupt_out_urb
, port
->serial
->dev
,
853 usb_sndintpipe(port
->serial
->dev
, port
->interrupt_out_endpointAddress
),
854 port
->interrupt_out_buffer
, port
->interrupt_out_size
,
855 cypress_write_int_callback
, port
, priv
->write_urb_interval
);
856 result
= usb_submit_urb(port
->interrupt_out_urb
, GFP_ATOMIC
);
859 "%s - failed submitting write urb, error %d\n",
861 priv
->write_urb_in_use
= 0;
862 cypress_set_dead(port
);
865 spin_lock_irqsave(&priv
->lock
, flags
);
869 /* do not count the line control and size bytes */
870 priv
->bytes_out
+= count
;
871 spin_unlock_irqrestore(&priv
->lock
, flags
);
873 usb_serial_port_softint(port
);
877 /* returns how much space is available in the soft buffer */
878 static int cypress_write_room(struct tty_struct
*tty
)
880 struct usb_serial_port
*port
= tty
->driver_data
;
881 struct cypress_private
*priv
= usb_get_serial_port_data(port
);
885 dbg("%s - port %d", __func__
, port
->number
);
887 spin_lock_irqsave(&priv
->lock
, flags
);
888 room
= cypress_buf_space_avail(priv
->buf
);
889 spin_unlock_irqrestore(&priv
->lock
, flags
);
891 dbg("%s - returns %d", __func__
, room
);
896 static int cypress_tiocmget(struct tty_struct
*tty
, struct file
*file
)
898 struct usb_serial_port
*port
= tty
->driver_data
;
899 struct cypress_private
*priv
= usb_get_serial_port_data(port
);
900 __u8 status
, control
;
901 unsigned int result
= 0;
904 dbg("%s - port %d", __func__
, port
->number
);
906 spin_lock_irqsave(&priv
->lock
, flags
);
907 control
= priv
->line_control
;
908 status
= priv
->current_status
;
909 spin_unlock_irqrestore(&priv
->lock
, flags
);
911 result
= ((control
& CONTROL_DTR
) ? TIOCM_DTR
: 0)
912 | ((control
& CONTROL_RTS
) ? TIOCM_RTS
: 0)
913 | ((status
& UART_CTS
) ? TIOCM_CTS
: 0)
914 | ((status
& UART_DSR
) ? TIOCM_DSR
: 0)
915 | ((status
& UART_RI
) ? TIOCM_RI
: 0)
916 | ((status
& UART_CD
) ? TIOCM_CD
: 0);
918 dbg("%s - result = %x", __func__
, result
);
924 static int cypress_tiocmset(struct tty_struct
*tty
, struct file
*file
,
925 unsigned int set
, unsigned int clear
)
927 struct usb_serial_port
*port
= tty
->driver_data
;
928 struct cypress_private
*priv
= usb_get_serial_port_data(port
);
931 dbg("%s - port %d", __func__
, port
->number
);
933 spin_lock_irqsave(&priv
->lock
, flags
);
935 priv
->line_control
|= CONTROL_RTS
;
937 priv
->line_control
|= CONTROL_DTR
;
938 if (clear
& TIOCM_RTS
)
939 priv
->line_control
&= ~CONTROL_RTS
;
940 if (clear
& TIOCM_DTR
)
941 priv
->line_control
&= ~CONTROL_DTR
;
943 spin_unlock_irqrestore(&priv
->lock
, flags
);
945 return cypress_write(tty
, port
, NULL
, 0);
949 static int cypress_ioctl(struct tty_struct
*tty
, struct file
*file
,
950 unsigned int cmd
, unsigned long arg
)
952 struct usb_serial_port
*port
= tty
->driver_data
;
953 struct cypress_private
*priv
= usb_get_serial_port_data(port
);
955 dbg("%s - port %d, cmd 0x%.4x", __func__
, port
->number
, cmd
);
958 /* This code comes from drivers/char/serial.c and ftdi_sio.c */
960 while (priv
!= NULL
) {
961 interruptible_sleep_on(&priv
->delta_msr_wait
);
962 /* see if a signal did it */
963 if (signal_pending(current
))
966 char diff
= priv
->diff_status
;
968 return -EIO
; /* no change => error */
970 /* consume all events */
971 priv
->diff_status
= 0;
973 /* return 0 if caller wanted to know about
975 if (((arg
& TIOCM_RNG
) && (diff
& UART_RI
)) ||
976 ((arg
& TIOCM_DSR
) && (diff
& UART_DSR
)) ||
977 ((arg
& TIOCM_CD
) && (diff
& UART_CD
)) ||
978 ((arg
& TIOCM_CTS
) && (diff
& UART_CTS
)))
980 /* otherwise caller can't care less about what
981 * happened, and so we continue to wait for
990 dbg("%s - arg not supported - it was 0x%04x - check include/asm/ioctls.h", __func__
, cmd
);
992 } /* cypress_ioctl */
995 static void cypress_set_termios(struct tty_struct
*tty
,
996 struct usb_serial_port
*port
, struct ktermios
*old_termios
)
998 struct cypress_private
*priv
= usb_get_serial_port_data(port
);
999 int data_bits
, stop_bits
, parity_type
, parity_enable
;
1000 unsigned cflag
, iflag
;
1001 unsigned long flags
;
1005 dbg("%s - port %d", __func__
, port
->number
);
1007 spin_lock_irqsave(&priv
->lock
, flags
);
1008 if (!priv
->termios_initialized
) {
1009 if (priv
->chiptype
== CT_EARTHMATE
) {
1010 *(tty
->termios
) = tty_std_termios
;
1011 tty
->termios
->c_cflag
= B4800
| CS8
| CREAD
| HUPCL
|
1013 tty
->termios
->c_ispeed
= 4800;
1014 tty
->termios
->c_ospeed
= 4800;
1015 } else if (priv
->chiptype
== CT_CYPHIDCOM
) {
1016 *(tty
->termios
) = tty_std_termios
;
1017 tty
->termios
->c_cflag
= B9600
| CS8
| CREAD
| HUPCL
|
1019 tty
->termios
->c_ispeed
= 9600;
1020 tty
->termios
->c_ospeed
= 9600;
1021 } else if (priv
->chiptype
== CT_CA42V2
) {
1022 *(tty
->termios
) = tty_std_termios
;
1023 tty
->termios
->c_cflag
= B9600
| CS8
| CREAD
| HUPCL
|
1025 tty
->termios
->c_ispeed
= 9600;
1026 tty
->termios
->c_ospeed
= 9600;
1028 priv
->termios_initialized
= 1;
1030 spin_unlock_irqrestore(&priv
->lock
, flags
);
1032 /* Unsupported features need clearing */
1033 tty
->termios
->c_cflag
&= ~(CMSPAR
|CRTSCTS
);
1035 cflag
= tty
->termios
->c_cflag
;
1036 iflag
= tty
->termios
->c_iflag
;
1038 /* check if there are new settings */
1040 spin_lock_irqsave(&priv
->lock
, flags
);
1041 priv
->tmp_termios
= *(tty
->termios
);
1042 spin_unlock_irqrestore(&priv
->lock
, flags
);
1045 /* set number of data bits, parity, stop bits */
1046 /* when parity is disabled the parity type bit is ignored */
1048 /* 1 means 2 stop bits, 0 means 1 stop bit */
1049 stop_bits
= cflag
& CSTOPB
? 1 : 0;
1051 if (cflag
& PARENB
) {
1053 /* 1 means odd parity, 0 means even parity */
1054 parity_type
= cflag
& PARODD
? 1 : 0;
1056 parity_enable
= parity_type
= 0;
1058 switch (cflag
& CSIZE
) {
1072 dev_err(&port
->dev
, "%s - CSIZE was set, but not CS5-CS8\n",
1076 spin_lock_irqsave(&priv
->lock
, flags
);
1077 oldlines
= priv
->line_control
;
1078 if ((cflag
& CBAUD
) == B0
) {
1079 /* drop dtr and rts */
1080 dbg("%s - dropping the lines, baud rate 0bps", __func__
);
1081 priv
->line_control
&= ~(CONTROL_DTR
| CONTROL_RTS
);
1083 priv
->line_control
= (CONTROL_DTR
| CONTROL_RTS
);
1084 spin_unlock_irqrestore(&priv
->lock
, flags
);
1086 dbg("%s - sending %d stop_bits, %d parity_enable, %d parity_type, "
1087 "%d data_bits (+5)", __func__
, stop_bits
,
1088 parity_enable
, parity_type
, data_bits
);
1090 cypress_serial_control(tty
, port
, tty_get_baud_rate(tty
),
1091 data_bits
, stop_bits
,
1092 parity_enable
, parity_type
,
1093 0, CYPRESS_SET_CONFIG
);
1095 /* we perform a CYPRESS_GET_CONFIG so that the current settings are
1096 * filled into the private structure this should confirm that all is
1097 * working if it returns what we just set */
1098 cypress_serial_control(tty
, port
, 0, 0, 0, 0, 0, 0, CYPRESS_GET_CONFIG
);
1100 /* Here we can define custom tty settings for devices; the main tty
1101 * termios flag base comes from empeg.c */
1103 spin_lock_irqsave(&priv
->lock
, flags
);
1104 if (priv
->chiptype
== CT_EARTHMATE
&& priv
->baud_rate
== 4800) {
1105 dbg("Using custom termios settings for a baud rate of "
1107 /* define custom termios settings for NMEA protocol */
1109 tty
->termios
->c_iflag
/* input modes - */
1110 &= ~(IGNBRK
/* disable ignore break */
1111 | BRKINT
/* disable break causes interrupt */
1112 | PARMRK
/* disable mark parity errors */
1113 | ISTRIP
/* disable clear high bit of input char */
1114 | INLCR
/* disable translate NL to CR */
1115 | IGNCR
/* disable ignore CR */
1116 | ICRNL
/* disable translate CR to NL */
1117 | IXON
); /* disable enable XON/XOFF flow control */
1119 tty
->termios
->c_oflag
/* output modes */
1120 &= ~OPOST
; /* disable postprocess output char */
1122 tty
->termios
->c_lflag
/* line discipline modes */
1123 &= ~(ECHO
/* disable echo input characters */
1124 | ECHONL
/* disable echo new line */
1125 | ICANON
/* disable erase, kill, werase, and rprnt
1126 special characters */
1127 | ISIG
/* disable interrupt, quit, and suspend
1128 special characters */
1129 | IEXTEN
); /* disable non-POSIX special characters */
1130 } /* CT_CYPHIDCOM: Application should handle this for device */
1132 linechange
= (priv
->line_control
!= oldlines
);
1133 spin_unlock_irqrestore(&priv
->lock
, flags
);
1135 /* if necessary, set lines */
1138 cypress_write(tty
, port
, NULL
, 0);
1140 } /* cypress_set_termios */
1143 /* returns amount of data still left in soft buffer */
1144 static int cypress_chars_in_buffer(struct tty_struct
*tty
)
1146 struct usb_serial_port
*port
= tty
->driver_data
;
1147 struct cypress_private
*priv
= usb_get_serial_port_data(port
);
1149 unsigned long flags
;
1151 dbg("%s - port %d", __func__
, port
->number
);
1153 spin_lock_irqsave(&priv
->lock
, flags
);
1154 chars
= cypress_buf_data_avail(priv
->buf
);
1155 spin_unlock_irqrestore(&priv
->lock
, flags
);
1157 dbg("%s - returns %d", __func__
, chars
);
1162 static void cypress_throttle(struct tty_struct
*tty
)
1164 struct usb_serial_port
*port
= tty
->driver_data
;
1165 struct cypress_private
*priv
= usb_get_serial_port_data(port
);
1166 unsigned long flags
;
1168 dbg("%s - port %d", __func__
, port
->number
);
1170 spin_lock_irqsave(&priv
->lock
, flags
);
1171 priv
->rx_flags
= THROTTLED
;
1172 spin_unlock_irqrestore(&priv
->lock
, flags
);
1176 static void cypress_unthrottle(struct tty_struct
*tty
)
1178 struct usb_serial_port
*port
= tty
->driver_data
;
1179 struct cypress_private
*priv
= usb_get_serial_port_data(port
);
1180 int actually_throttled
, result
;
1181 unsigned long flags
;
1183 dbg("%s - port %d", __func__
, port
->number
);
1185 spin_lock_irqsave(&priv
->lock
, flags
);
1186 actually_throttled
= priv
->rx_flags
& ACTUALLY_THROTTLED
;
1188 spin_unlock_irqrestore(&priv
->lock
, flags
);
1190 if (!priv
->comm_is_ok
)
1193 if (actually_throttled
) {
1194 port
->interrupt_in_urb
->dev
= port
->serial
->dev
;
1196 result
= usb_submit_urb(port
->interrupt_in_urb
, GFP_ATOMIC
);
1198 dev_err(&port
->dev
, "%s - failed submitting read urb, "
1199 "error %d\n", __func__
, result
);
1200 cypress_set_dead(port
);
1206 static void cypress_read_int_callback(struct urb
*urb
)
1208 struct usb_serial_port
*port
= urb
->context
;
1209 struct cypress_private
*priv
= usb_get_serial_port_data(port
);
1210 struct tty_struct
*tty
;
1211 unsigned char *data
= urb
->transfer_buffer
;
1212 unsigned long flags
;
1213 char tty_flag
= TTY_NORMAL
;
1218 int status
= urb
->status
;
1220 dbg("%s - port %d", __func__
, port
->number
);
1223 case 0: /* success */
1228 /* precursor to disconnect so just go away */
1231 /* Can't call usb_clear_halt while in_interrupt */
1234 /* something ugly is going on... */
1235 dev_err(&urb
->dev
->dev
,
1236 "%s - unexpected nonzero read status received: %d\n",
1238 cypress_set_dead(port
);
1242 spin_lock_irqsave(&priv
->lock
, flags
);
1243 if (priv
->rx_flags
& THROTTLED
) {
1244 dbg("%s - now throttling", __func__
);
1245 priv
->rx_flags
|= ACTUALLY_THROTTLED
;
1246 spin_unlock_irqrestore(&priv
->lock
, flags
);
1249 spin_unlock_irqrestore(&priv
->lock
, flags
);
1251 tty
= tty_port_tty_get(&port
->port
);
1253 dbg("%s - bad tty pointer - exiting", __func__
);
1257 spin_lock_irqsave(&priv
->lock
, flags
);
1258 result
= urb
->actual_length
;
1259 switch (priv
->pkt_fmt
) {
1261 case packet_format_1
:
1262 /* This is for the CY7C64013... */
1263 priv
->current_status
= data
[0] & 0xF8;
1264 bytes
= data
[1] + 2;
1269 case packet_format_2
:
1270 /* This is for the CY7C63743... */
1271 priv
->current_status
= data
[0] & 0xF8;
1272 bytes
= (data
[0] & 0x07) + 1;
1278 spin_unlock_irqrestore(&priv
->lock
, flags
);
1279 if (result
< bytes
) {
1280 dbg("%s - wrong packet size - received %d bytes but packet "
1281 "said %d bytes", __func__
, result
, bytes
);
1285 usb_serial_debug_data(debug
, &port
->dev
, __func__
,
1286 urb
->actual_length
, data
);
1288 spin_lock_irqsave(&priv
->lock
, flags
);
1289 /* check to see if status has changed */
1290 if (priv
->current_status
!= priv
->prev_status
) {
1291 priv
->diff_status
|= priv
->current_status
^
1293 wake_up_interruptible(&priv
->delta_msr_wait
);
1294 priv
->prev_status
= priv
->current_status
;
1296 spin_unlock_irqrestore(&priv
->lock
, flags
);
1298 /* hangup, as defined in acm.c... this might be a bad place for it
1300 if (tty
&& !(tty
->termios
->c_cflag
& CLOCAL
) &&
1301 !(priv
->current_status
& UART_CD
)) {
1302 dbg("%s - calling hangup", __func__
);
1307 /* There is one error bit... I'm assuming it is a parity error
1308 * indicator as the generic firmware will set this bit to 1 if a
1309 * parity error occurs.
1310 * I can not find reference to any other error events. */
1311 spin_lock_irqsave(&priv
->lock
, flags
);
1312 if (priv
->current_status
& CYP_ERROR
) {
1313 spin_unlock_irqrestore(&priv
->lock
, flags
);
1314 tty_flag
= TTY_PARITY
;
1315 dbg("%s - Parity Error detected", __func__
);
1317 spin_unlock_irqrestore(&priv
->lock
, flags
);
1319 /* process read if there is data other than line status */
1320 if (tty
&& (bytes
> i
)) {
1321 bytes
= tty_buffer_request_room(tty
, bytes
);
1322 for (; i
< bytes
; ++i
) {
1323 dbg("pushing byte number %d - %d - %c", i
, data
[i
],
1325 tty_insert_flip_char(tty
, data
[i
], tty_flag
);
1327 tty_flip_buffer_push(tty
);
1330 spin_lock_irqsave(&priv
->lock
, flags
);
1331 /* control and status byte(s) are also counted */
1332 priv
->bytes_in
+= bytes
;
1333 spin_unlock_irqrestore(&priv
->lock
, flags
);
1338 /* Continue trying to always read... unless the port has closed. */
1340 if (port
->port
.count
> 0 && priv
->comm_is_ok
) {
1341 usb_fill_int_urb(port
->interrupt_in_urb
, port
->serial
->dev
,
1342 usb_rcvintpipe(port
->serial
->dev
,
1343 port
->interrupt_in_endpointAddress
),
1344 port
->interrupt_in_urb
->transfer_buffer
,
1345 port
->interrupt_in_urb
->transfer_buffer_length
,
1346 cypress_read_int_callback
, port
,
1347 priv
->read_urb_interval
);
1348 result
= usb_submit_urb(port
->interrupt_in_urb
, GFP_ATOMIC
);
1350 dev_err(&urb
->dev
->dev
, "%s - failed resubmitting "
1351 "read urb, error %d\n", __func__
,
1353 cypress_set_dead(port
);
1358 } /* cypress_read_int_callback */
1361 static void cypress_write_int_callback(struct urb
*urb
)
1363 struct usb_serial_port
*port
= urb
->context
;
1364 struct cypress_private
*priv
= usb_get_serial_port_data(port
);
1366 int status
= urb
->status
;
1368 dbg("%s - port %d", __func__
, port
->number
);
1377 /* this urb is terminated, clean up */
1378 dbg("%s - urb shutting down with status: %d",
1380 priv
->write_urb_in_use
= 0;
1382 case -EPIPE
: /* no break needed; clear halt and resubmit */
1383 if (!priv
->comm_is_ok
)
1385 usb_clear_halt(port
->serial
->dev
, 0x02);
1386 /* error in the urb, so we have to resubmit it */
1387 dbg("%s - nonzero write bulk status received: %d",
1389 port
->interrupt_out_urb
->transfer_buffer_length
= 1;
1390 port
->interrupt_out_urb
->dev
= port
->serial
->dev
;
1391 result
= usb_submit_urb(port
->interrupt_out_urb
, GFP_ATOMIC
);
1394 dev_err(&urb
->dev
->dev
,
1395 "%s - failed resubmitting write urb, error %d\n",
1397 cypress_set_dead(port
);
1400 dev_err(&urb
->dev
->dev
,
1401 "%s - unexpected nonzero write status received: %d\n",
1403 cypress_set_dead(port
);
1406 priv
->write_urb_in_use
= 0;
1408 /* send any buffered data */
1413 /*****************************************************************************
1414 * Write buffer functions - buffering code from pl2303 used
1415 *****************************************************************************/
1420 * Allocate a circular buffer and all associated memory.
1423 static struct cypress_buf
*cypress_buf_alloc(unsigned int size
)
1426 struct cypress_buf
*cb
;
1432 cb
= kmalloc(sizeof(struct cypress_buf
), GFP_KERNEL
);
1436 cb
->buf_buf
= kmalloc(size
, GFP_KERNEL
);
1437 if (cb
->buf_buf
== NULL
) {
1442 cb
->buf_size
= size
;
1443 cb
->buf_get
= cb
->buf_put
= cb
->buf_buf
;
1453 * Free the buffer and all associated memory.
1456 static void cypress_buf_free(struct cypress_buf
*cb
)
1468 * Clear out all data in the circular buffer.
1471 static void cypress_buf_clear(struct cypress_buf
*cb
)
1474 cb
->buf_get
= cb
->buf_put
;
1475 /* equivalent to a get of all data available */
1480 * cypress_buf_data_avail
1482 * Return the number of bytes of data available in the circular
1486 static unsigned int cypress_buf_data_avail(struct cypress_buf
*cb
)
1489 return (cb
->buf_size
+ cb
->buf_put
- cb
->buf_get
)
1497 * cypress_buf_space_avail
1499 * Return the number of bytes of space available in the circular
1503 static unsigned int cypress_buf_space_avail(struct cypress_buf
*cb
)
1506 return (cb
->buf_size
+ cb
->buf_get
- cb
->buf_put
- 1)
1516 * Copy data data from a user buffer and put it into the circular buffer.
1517 * Restrict to the amount of space available.
1519 * Return the number of bytes copied.
1522 static unsigned int cypress_buf_put(struct cypress_buf
*cb
, const char *buf
,
1532 len
= cypress_buf_space_avail(cb
);
1539 len
= cb
->buf_buf
+ cb
->buf_size
- cb
->buf_put
;
1541 memcpy(cb
->buf_put
, buf
, len
);
1542 memcpy(cb
->buf_buf
, buf
+len
, count
- len
);
1543 cb
->buf_put
= cb
->buf_buf
+ count
- len
;
1545 memcpy(cb
->buf_put
, buf
, count
);
1547 cb
->buf_put
+= count
;
1548 else /* count == len */
1549 cb
->buf_put
= cb
->buf_buf
;
1560 * Get data from the circular buffer and copy to the given buffer.
1561 * Restrict to the amount of data available.
1563 * Return the number of bytes copied.
1566 static unsigned int cypress_buf_get(struct cypress_buf
*cb
, char *buf
,
1576 len
= cypress_buf_data_avail(cb
);
1583 len
= cb
->buf_buf
+ cb
->buf_size
- cb
->buf_get
;
1585 memcpy(buf
, cb
->buf_get
, len
);
1586 memcpy(buf
+len
, cb
->buf_buf
, count
- len
);
1587 cb
->buf_get
= cb
->buf_buf
+ count
- len
;
1589 memcpy(buf
, cb
->buf_get
, count
);
1591 cb
->buf_get
+= count
;
1592 else /* count == len */
1593 cb
->buf_get
= cb
->buf_buf
;
1600 /*****************************************************************************
1602 *****************************************************************************/
1604 static int __init
cypress_init(void)
1608 dbg("%s", __func__
);
1610 retval
= usb_serial_register(&cypress_earthmate_device
);
1612 goto failed_em_register
;
1613 retval
= usb_serial_register(&cypress_hidcom_device
);
1615 goto failed_hidcom_register
;
1616 retval
= usb_serial_register(&cypress_ca42v2_device
);
1618 goto failed_ca42v2_register
;
1619 retval
= usb_register(&cypress_driver
);
1621 goto failed_usb_register
;
1623 printk(KERN_INFO KBUILD_MODNAME
": " DRIVER_VERSION
":"
1627 failed_usb_register
:
1628 usb_serial_deregister(&cypress_ca42v2_device
);
1629 failed_ca42v2_register
:
1630 usb_serial_deregister(&cypress_hidcom_device
);
1631 failed_hidcom_register
:
1632 usb_serial_deregister(&cypress_earthmate_device
);
1638 static void __exit
cypress_exit(void)
1640 dbg("%s", __func__
);
1642 usb_deregister(&cypress_driver
);
1643 usb_serial_deregister(&cypress_earthmate_device
);
1644 usb_serial_deregister(&cypress_hidcom_device
);
1645 usb_serial_deregister(&cypress_ca42v2_device
);
1649 module_init(cypress_init
);
1650 module_exit(cypress_exit
);
1652 MODULE_AUTHOR(DRIVER_AUTHOR
);
1653 MODULE_DESCRIPTION(DRIVER_DESC
);
1654 MODULE_VERSION(DRIVER_VERSION
);
1655 MODULE_LICENSE("GPL");
1657 module_param(debug
, bool, S_IRUGO
| S_IWUSR
);
1658 MODULE_PARM_DESC(debug
, "Debug enabled or not");
1659 module_param(stats
, bool, S_IRUGO
| S_IWUSR
);
1660 MODULE_PARM_DESC(stats
, "Enable statistics or not");
1661 module_param(interval
, int, S_IRUGO
| S_IWUSR
);
1662 MODULE_PARM_DESC(interval
, "Overrides interrupt interval");