1 // SPDX-License-Identifier: GPL-2.0+
3 * USB Cypress M8 driver
6 * Lonnie Mendez (dignome@gmail.com)
7 * Copyright (C) 2003,2004
8 * Neil Whelchel (koyama@firstlight.net)
10 * See Documentation/usb/usb-serial.txt for more information on using this
13 * See http://geocities.com/i0xox0i for information on this driver and the
14 * earthmate usb device.
17 /* Thanks to Neil Whelchel for writing the first cypress m8 implementation
19 /* Thanks to cypress for providing references for the hid reports. */
20 /* Thanks to Jiang Zhang for providing links and for general help. */
21 /* Code originates and was built up from ftdi_sio, belkin, pl2303 and others.*/
24 #include <linux/kernel.h>
25 #include <linux/errno.h>
26 #include <linux/slab.h>
27 #include <linux/tty.h>
28 #include <linux/tty_driver.h>
29 #include <linux/tty_flip.h>
30 #include <linux/module.h>
31 #include <linux/moduleparam.h>
32 #include <linux/spinlock.h>
33 #include <linux/usb.h>
34 #include <linux/usb/serial.h>
35 #include <linux/serial.h>
36 #include <linux/kfifo.h>
37 #include <linux/delay.h>
38 #include <linux/uaccess.h>
39 #include <asm/unaligned.h>
41 #include "cypress_m8.h"
46 static bool unstable_bauds;
48 #define DRIVER_AUTHOR "Lonnie Mendez <dignome@gmail.com>, Neil Whelchel <koyama@firstlight.net>"
49 #define DRIVER_DESC "Cypress USB to Serial Driver"
51 /* write buffer size defines */
52 #define CYPRESS_BUF_SIZE 1024
54 static const struct usb_device_id id_table_earthmate[] = {
55 { USB_DEVICE(VENDOR_ID_DELORME, PRODUCT_ID_EARTHMATEUSB) },
56 { USB_DEVICE(VENDOR_ID_DELORME, PRODUCT_ID_EARTHMATEUSB_LT20) },
57 { } /* Terminating entry */
60 static const struct usb_device_id id_table_cyphidcomrs232[] = {
61 { USB_DEVICE(VENDOR_ID_CYPRESS, PRODUCT_ID_CYPHIDCOM) },
62 { USB_DEVICE(VENDOR_ID_POWERCOM, PRODUCT_ID_UPS) },
63 { USB_DEVICE(VENDOR_ID_FRWD, PRODUCT_ID_CYPHIDCOM_FRWD) },
64 { } /* Terminating entry */
67 static const struct usb_device_id id_table_nokiaca42v2[] = {
68 { USB_DEVICE(VENDOR_ID_DAZZLE, PRODUCT_ID_CA42) },
69 { } /* Terminating entry */
72 static const struct usb_device_id id_table_combined[] = {
73 { USB_DEVICE(VENDOR_ID_DELORME, PRODUCT_ID_EARTHMATEUSB) },
74 { USB_DEVICE(VENDOR_ID_DELORME, PRODUCT_ID_EARTHMATEUSB_LT20) },
75 { USB_DEVICE(VENDOR_ID_CYPRESS, PRODUCT_ID_CYPHIDCOM) },
76 { USB_DEVICE(VENDOR_ID_POWERCOM, PRODUCT_ID_UPS) },
77 { USB_DEVICE(VENDOR_ID_FRWD, PRODUCT_ID_CYPHIDCOM_FRWD) },
78 { USB_DEVICE(VENDOR_ID_DAZZLE, PRODUCT_ID_CA42) },
79 { } /* Terminating entry */
82 MODULE_DEVICE_TABLE(usb, id_table_combined);
85 packet_format_1, /* b0:status, b1:payload count */
86 packet_format_2 /* b0[7:3]:status, b0[2:0]:payload count */
89 struct cypress_private {
90 spinlock_t lock; /* private lock */
91 int chiptype; /* identifier of device, for quirks/etc */
92 int bytes_in; /* used for statistics */
93 int bytes_out; /* used for statistics */
94 int cmd_count; /* used for statistics */
95 int cmd_ctrl; /* always set this to 1 before issuing a command */
96 struct kfifo write_fifo; /* write fifo */
97 int write_urb_in_use; /* write urb in use indicator */
98 int write_urb_interval; /* interval to use for write urb */
99 int read_urb_interval; /* interval to use for read urb */
100 int comm_is_ok; /* true if communication is (still) ok */
101 int termios_initialized;
102 __u8 line_control; /* holds dtr / rts value */
103 __u8 current_status; /* received from last read - info on dsr,cts,cd,ri,etc */
104 __u8 current_config; /* stores the current configuration byte */
105 __u8 rx_flags; /* throttling - used from whiteheat/ftdi_sio */
106 enum packet_format pkt_fmt; /* format to use for packet send / receive */
107 int get_cfg_unsafe; /* If true, the CYPRESS_GET_CONFIG is unsafe */
108 int baud_rate; /* stores current baud rate in
110 int isthrottled; /* if throttled, discard reads */
111 char prev_status; /* used for TIOCMIWAIT */
112 /* we pass a pointer to this as the argument sent to
113 cypress_set_termios old_termios */
114 struct ktermios tmp_termios; /* stores the old termios settings */
117 /* function prototypes for the Cypress USB to serial device */
118 static int cypress_earthmate_port_probe(struct usb_serial_port *port);
119 static int cypress_hidcom_port_probe(struct usb_serial_port *port);
120 static int cypress_ca42v2_port_probe(struct usb_serial_port *port);
121 static int cypress_port_remove(struct usb_serial_port *port);
122 static int cypress_open(struct tty_struct *tty, struct usb_serial_port *port);
123 static void cypress_close(struct usb_serial_port *port);
124 static void cypress_dtr_rts(struct usb_serial_port *port, int on);
125 static int cypress_write(struct tty_struct *tty, struct usb_serial_port *port,
126 const unsigned char *buf, int count);
127 static void cypress_send(struct usb_serial_port *port);
128 static int cypress_write_room(struct tty_struct *tty);
129 static void cypress_set_termios(struct tty_struct *tty,
130 struct usb_serial_port *port, struct ktermios *old);
131 static int cypress_tiocmget(struct tty_struct *tty);
132 static int cypress_tiocmset(struct tty_struct *tty,
133 unsigned int set, unsigned int clear);
134 static int cypress_chars_in_buffer(struct tty_struct *tty);
135 static void cypress_throttle(struct tty_struct *tty);
136 static void cypress_unthrottle(struct tty_struct *tty);
137 static void cypress_set_dead(struct usb_serial_port *port);
138 static void cypress_read_int_callback(struct urb *urb);
139 static void cypress_write_int_callback(struct urb *urb);
141 static struct usb_serial_driver cypress_earthmate_device = {
143 .owner = THIS_MODULE,
146 .description = "DeLorme Earthmate USB",
147 .id_table = id_table_earthmate,
149 .port_probe = cypress_earthmate_port_probe,
150 .port_remove = cypress_port_remove,
151 .open = cypress_open,
152 .close = cypress_close,
153 .dtr_rts = cypress_dtr_rts,
154 .write = cypress_write,
155 .write_room = cypress_write_room,
156 .set_termios = cypress_set_termios,
157 .tiocmget = cypress_tiocmget,
158 .tiocmset = cypress_tiocmset,
159 .tiocmiwait = usb_serial_generic_tiocmiwait,
160 .chars_in_buffer = cypress_chars_in_buffer,
161 .throttle = cypress_throttle,
162 .unthrottle = cypress_unthrottle,
163 .read_int_callback = cypress_read_int_callback,
164 .write_int_callback = cypress_write_int_callback,
167 static struct usb_serial_driver cypress_hidcom_device = {
169 .owner = THIS_MODULE,
172 .description = "HID->COM RS232 Adapter",
173 .id_table = id_table_cyphidcomrs232,
175 .port_probe = cypress_hidcom_port_probe,
176 .port_remove = cypress_port_remove,
177 .open = cypress_open,
178 .close = cypress_close,
179 .dtr_rts = cypress_dtr_rts,
180 .write = cypress_write,
181 .write_room = cypress_write_room,
182 .set_termios = cypress_set_termios,
183 .tiocmget = cypress_tiocmget,
184 .tiocmset = cypress_tiocmset,
185 .tiocmiwait = usb_serial_generic_tiocmiwait,
186 .chars_in_buffer = cypress_chars_in_buffer,
187 .throttle = cypress_throttle,
188 .unthrottle = cypress_unthrottle,
189 .read_int_callback = cypress_read_int_callback,
190 .write_int_callback = cypress_write_int_callback,
193 static struct usb_serial_driver cypress_ca42v2_device = {
195 .owner = THIS_MODULE,
196 .name = "nokiaca42v2",
198 .description = "Nokia CA-42 V2 Adapter",
199 .id_table = id_table_nokiaca42v2,
201 .port_probe = cypress_ca42v2_port_probe,
202 .port_remove = cypress_port_remove,
203 .open = cypress_open,
204 .close = cypress_close,
205 .dtr_rts = cypress_dtr_rts,
206 .write = cypress_write,
207 .write_room = cypress_write_room,
208 .set_termios = cypress_set_termios,
209 .tiocmget = cypress_tiocmget,
210 .tiocmset = cypress_tiocmset,
211 .tiocmiwait = usb_serial_generic_tiocmiwait,
212 .chars_in_buffer = cypress_chars_in_buffer,
213 .throttle = cypress_throttle,
214 .unthrottle = cypress_unthrottle,
215 .read_int_callback = cypress_read_int_callback,
216 .write_int_callback = cypress_write_int_callback,
219 static struct usb_serial_driver * const serial_drivers[] = {
220 &cypress_earthmate_device, &cypress_hidcom_device,
221 &cypress_ca42v2_device, NULL
224 /*****************************************************************************
225 * Cypress serial helper functions
226 *****************************************************************************/
228 /* FRWD Dongle hidcom needs to skip reset and speed checks */
229 static inline bool is_frwd(struct usb_device *dev)
231 return ((le16_to_cpu(dev->descriptor.idVendor) == VENDOR_ID_FRWD) &&
232 (le16_to_cpu(dev->descriptor.idProduct) == PRODUCT_ID_CYPHIDCOM_FRWD));
235 static int analyze_baud_rate(struct usb_serial_port *port, speed_t new_rate)
237 struct cypress_private *priv;
238 priv = usb_get_serial_port_data(port);
243 /* FRWD Dongle uses 115200 bps */
244 if (is_frwd(port->serial->dev))
248 * The general purpose firmware for the Cypress M8 allows for
249 * a maximum speed of 57600bps (I have no idea whether DeLorme
250 * chose to use the general purpose firmware or not), if you
251 * need to modify this speed setting for your own project
252 * please add your own chiptype and modify the code likewise.
253 * The Cypress HID->COM device will work successfully up to
254 * 115200bps (but the actual throughput is around 3kBps).
256 if (port->serial->dev->speed == USB_SPEED_LOW) {
258 * Mike Isely <isely@pobox.com> 2-Feb-2008: The
259 * Cypress app note that describes this mechanism
260 * states the the low-speed part can't handle more
261 * than 800 bytes/sec, in which case 4800 baud is the
262 * safest speed for a part like that.
264 if (new_rate > 4800) {
266 "%s - failed setting baud rate, device incapable speed %d\n",
271 switch (priv->chiptype) {
273 if (new_rate <= 600) {
274 /* 300 and 600 baud rates are supported under
275 * the generic firmware, but are not used with
276 * NMEA and SiRF protocols */
278 "%s - failed setting baud rate, unsupported speed of %d on Earthmate GPS\n",
290 /* This function can either set or retrieve the current serial line settings */
291 static int cypress_serial_control(struct tty_struct *tty,
292 struct usb_serial_port *port, speed_t baud_rate, int data_bits,
293 int stop_bits, int parity_enable, int parity_type, int reset,
294 int cypress_request_type)
296 int new_baudrate = 0, retval = 0, tries = 0;
297 struct cypress_private *priv;
298 struct device *dev = &port->dev;
300 const unsigned int feature_len = 5;
303 priv = usb_get_serial_port_data(port);
305 if (!priv->comm_is_ok)
308 feature_buffer = kcalloc(feature_len, sizeof(u8), GFP_KERNEL);
312 switch (cypress_request_type) {
313 case CYPRESS_SET_CONFIG:
314 /* 0 means 'Hang up' so doesn't change the true bit rate */
315 new_baudrate = priv->baud_rate;
316 if (baud_rate && baud_rate != priv->baud_rate) {
317 dev_dbg(dev, "%s - baud rate is changing\n", __func__);
318 retval = analyze_baud_rate(port, baud_rate);
320 new_baudrate = retval;
321 dev_dbg(dev, "%s - New baud rate set to %d\n",
322 __func__, new_baudrate);
325 dev_dbg(dev, "%s - baud rate is being sent as %d\n", __func__,
328 /* fill the feature_buffer with new configuration */
329 put_unaligned_le32(new_baudrate, feature_buffer);
330 feature_buffer[4] |= data_bits; /* assign data bits in 2 bit space ( max 3 ) */
332 feature_buffer[4] |= (stop_bits << 3); /* assign stop bits in 1 bit space */
333 feature_buffer[4] |= (parity_enable << 4); /* assign parity flag in 1 bit space */
334 feature_buffer[4] |= (parity_type << 5); /* assign parity type in 1 bit space */
336 feature_buffer[4] |= (reset << 7); /* assign reset at end of byte, 1 bit space */
338 dev_dbg(dev, "%s - device is being sent this feature report:\n", __func__);
339 dev_dbg(dev, "%s - %02X - %02X - %02X - %02X - %02X\n", __func__,
340 feature_buffer[0], feature_buffer[1],
341 feature_buffer[2], feature_buffer[3],
345 retval = usb_control_msg(port->serial->dev,
346 usb_sndctrlpipe(port->serial->dev, 0),
348 USB_DIR_OUT | USB_RECIP_INTERFACE | USB_TYPE_CLASS,
349 0x0300, 0, feature_buffer,
355 } while (retval != feature_len &&
358 if (retval != feature_len) {
359 dev_err(dev, "%s - failed sending serial line settings - %d\n",
361 cypress_set_dead(port);
363 spin_lock_irqsave(&priv->lock, flags);
364 priv->baud_rate = new_baudrate;
365 priv->current_config = feature_buffer[4];
366 spin_unlock_irqrestore(&priv->lock, flags);
367 /* If we asked for a speed change encode it */
369 tty_encode_baud_rate(tty,
370 new_baudrate, new_baudrate);
373 case CYPRESS_GET_CONFIG:
374 if (priv->get_cfg_unsafe) {
375 /* Not implemented for this device,
376 and if we try to do it we're likely
377 to crash the hardware. */
381 dev_dbg(dev, "%s - retrieving serial line settings\n", __func__);
383 retval = usb_control_msg(port->serial->dev,
384 usb_rcvctrlpipe(port->serial->dev, 0),
386 USB_DIR_IN | USB_RECIP_INTERFACE | USB_TYPE_CLASS,
387 0x0300, 0, feature_buffer,
392 } while (retval != feature_len
393 && retval != -ENODEV);
395 if (retval != feature_len) {
396 dev_err(dev, "%s - failed to retrieve serial line settings - %d\n",
398 cypress_set_dead(port);
401 spin_lock_irqsave(&priv->lock, flags);
402 /* store the config in one byte, and later
403 use bit masks to check values */
404 priv->current_config = feature_buffer[4];
405 priv->baud_rate = get_unaligned_le32(feature_buffer);
406 spin_unlock_irqrestore(&priv->lock, flags);
409 spin_lock_irqsave(&priv->lock, flags);
411 spin_unlock_irqrestore(&priv->lock, flags);
413 kfree(feature_buffer);
415 } /* cypress_serial_control */
418 static void cypress_set_dead(struct usb_serial_port *port)
420 struct cypress_private *priv = usb_get_serial_port_data(port);
423 spin_lock_irqsave(&priv->lock, flags);
424 if (!priv->comm_is_ok) {
425 spin_unlock_irqrestore(&priv->lock, flags);
428 priv->comm_is_ok = 0;
429 spin_unlock_irqrestore(&priv->lock, flags);
431 dev_err(&port->dev, "cypress_m8 suspending failing port %d - "
432 "interval might be too short\n", port->port_number);
436 /*****************************************************************************
437 * Cypress serial driver functions
438 *****************************************************************************/
441 static int cypress_generic_port_probe(struct usb_serial_port *port)
443 struct usb_serial *serial = port->serial;
444 struct cypress_private *priv;
446 if (!port->interrupt_out_urb || !port->interrupt_in_urb) {
447 dev_err(&port->dev, "required endpoint is missing\n");
451 priv = kzalloc(sizeof(struct cypress_private), GFP_KERNEL);
455 priv->comm_is_ok = !0;
456 spin_lock_init(&priv->lock);
457 if (kfifo_alloc(&priv->write_fifo, CYPRESS_BUF_SIZE, GFP_KERNEL)) {
462 /* Skip reset for FRWD device. It is a workaound:
463 device hangs if it receives SET_CONFIGURE in Configured
465 if (!is_frwd(serial->dev))
466 usb_reset_configuration(serial->dev);
469 priv->line_control = 0;
470 priv->termios_initialized = 0;
472 /* Default packet format setting is determined by packet size.
473 Anything with a size larger then 9 must have a separate
474 count field since the 3 bit count field is otherwise too
475 small. Otherwise we can use the slightly more compact
476 format. This is in accordance with the cypress_m8 serial
477 converter app note. */
478 if (port->interrupt_out_size > 9)
479 priv->pkt_fmt = packet_format_1;
481 priv->pkt_fmt = packet_format_2;
484 priv->write_urb_interval = interval;
485 priv->read_urb_interval = interval;
486 dev_dbg(&port->dev, "%s - read & write intervals forced to %d\n",
489 priv->write_urb_interval = port->interrupt_out_urb->interval;
490 priv->read_urb_interval = port->interrupt_in_urb->interval;
491 dev_dbg(&port->dev, "%s - intervals: read=%d write=%d\n",
492 __func__, priv->read_urb_interval,
493 priv->write_urb_interval);
495 usb_set_serial_port_data(port, priv);
497 port->port.drain_delay = 256;
503 static int cypress_earthmate_port_probe(struct usb_serial_port *port)
505 struct usb_serial *serial = port->serial;
506 struct cypress_private *priv;
509 ret = cypress_generic_port_probe(port);
511 dev_dbg(&port->dev, "%s - Failed setting up port\n", __func__);
515 priv = usb_get_serial_port_data(port);
516 priv->chiptype = CT_EARTHMATE;
517 /* All Earthmate devices use the separated-count packet
519 priv->pkt_fmt = packet_format_1;
520 if (serial->dev->descriptor.idProduct !=
521 cpu_to_le16(PRODUCT_ID_EARTHMATEUSB)) {
522 /* The old original USB Earthmate seemed able to
523 handle GET_CONFIG requests; everything they've
524 produced since that time crashes if this command is
527 "%s - Marking this device as unsafe for GET_CONFIG commands\n",
529 priv->get_cfg_unsafe = !0;
535 static int cypress_hidcom_port_probe(struct usb_serial_port *port)
537 struct cypress_private *priv;
540 ret = cypress_generic_port_probe(port);
542 dev_dbg(&port->dev, "%s - Failed setting up port\n", __func__);
546 priv = usb_get_serial_port_data(port);
547 priv->chiptype = CT_CYPHIDCOM;
552 static int cypress_ca42v2_port_probe(struct usb_serial_port *port)
554 struct cypress_private *priv;
557 ret = cypress_generic_port_probe(port);
559 dev_dbg(&port->dev, "%s - Failed setting up port\n", __func__);
563 priv = usb_get_serial_port_data(port);
564 priv->chiptype = CT_CA42V2;
569 static int cypress_port_remove(struct usb_serial_port *port)
571 struct cypress_private *priv;
573 priv = usb_get_serial_port_data(port);
575 kfifo_free(&priv->write_fifo);
581 static int cypress_open(struct tty_struct *tty, struct usb_serial_port *port)
583 struct cypress_private *priv = usb_get_serial_port_data(port);
584 struct usb_serial *serial = port->serial;
588 if (!priv->comm_is_ok)
591 /* clear halts before open */
592 usb_clear_halt(serial->dev, 0x81);
593 usb_clear_halt(serial->dev, 0x02);
595 spin_lock_irqsave(&priv->lock, flags);
596 /* reset read/write statistics */
601 spin_unlock_irqrestore(&priv->lock, flags);
607 cypress_set_termios(tty, port, &priv->tmp_termios);
609 /* setup the port and start reading from the device */
610 usb_fill_int_urb(port->interrupt_in_urb, serial->dev,
611 usb_rcvintpipe(serial->dev, port->interrupt_in_endpointAddress),
612 port->interrupt_in_urb->transfer_buffer,
613 port->interrupt_in_urb->transfer_buffer_length,
614 cypress_read_int_callback, port, priv->read_urb_interval);
615 result = usb_submit_urb(port->interrupt_in_urb, GFP_KERNEL);
619 "%s - failed submitting read urb, error %d\n",
621 cypress_set_dead(port);
627 static void cypress_dtr_rts(struct usb_serial_port *port, int on)
629 struct cypress_private *priv = usb_get_serial_port_data(port);
630 /* drop dtr and rts */
631 spin_lock_irq(&priv->lock);
633 priv->line_control = 0;
635 priv->line_control = CONTROL_DTR | CONTROL_RTS;
637 spin_unlock_irq(&priv->lock);
638 cypress_write(NULL, port, NULL, 0);
641 static void cypress_close(struct usb_serial_port *port)
643 struct cypress_private *priv = usb_get_serial_port_data(port);
646 spin_lock_irqsave(&priv->lock, flags);
647 kfifo_reset_out(&priv->write_fifo);
648 spin_unlock_irqrestore(&priv->lock, flags);
650 dev_dbg(&port->dev, "%s - stopping urbs\n", __func__);
651 usb_kill_urb(port->interrupt_in_urb);
652 usb_kill_urb(port->interrupt_out_urb);
655 dev_info(&port->dev, "Statistics: %d Bytes In | %d Bytes Out | %d Commands Issued\n",
656 priv->bytes_in, priv->bytes_out, priv->cmd_count);
657 } /* cypress_close */
660 static int cypress_write(struct tty_struct *tty, struct usb_serial_port *port,
661 const unsigned char *buf, int count)
663 struct cypress_private *priv = usb_get_serial_port_data(port);
665 dev_dbg(&port->dev, "%s - %d bytes\n", __func__, count);
667 /* line control commands, which need to be executed immediately,
668 are not put into the buffer for obvious reasons.
670 if (priv->cmd_ctrl) {
678 count = kfifo_in_locked(&priv->write_fifo, buf, count, &priv->lock);
684 } /* cypress_write */
687 static void cypress_send(struct usb_serial_port *port)
689 int count = 0, result, offset, actual_size;
690 struct cypress_private *priv = usb_get_serial_port_data(port);
691 struct device *dev = &port->dev;
694 if (!priv->comm_is_ok)
697 dev_dbg(dev, "%s - interrupt out size is %d\n", __func__,
698 port->interrupt_out_size);
700 spin_lock_irqsave(&priv->lock, flags);
701 if (priv->write_urb_in_use) {
702 dev_dbg(dev, "%s - can't write, urb in use\n", __func__);
703 spin_unlock_irqrestore(&priv->lock, flags);
706 spin_unlock_irqrestore(&priv->lock, flags);
709 memset(port->interrupt_out_urb->transfer_buffer, 0,
710 port->interrupt_out_size);
712 spin_lock_irqsave(&priv->lock, flags);
713 switch (priv->pkt_fmt) {
715 case packet_format_1:
716 /* this is for the CY7C64013... */
718 port->interrupt_out_buffer[0] = priv->line_control;
720 case packet_format_2:
721 /* this is for the CY7C63743... */
723 port->interrupt_out_buffer[0] = priv->line_control;
727 if (priv->line_control & CONTROL_RESET)
728 priv->line_control &= ~CONTROL_RESET;
730 if (priv->cmd_ctrl) {
732 dev_dbg(dev, "%s - line control command being issued\n", __func__);
733 spin_unlock_irqrestore(&priv->lock, flags);
736 spin_unlock_irqrestore(&priv->lock, flags);
738 count = kfifo_out_locked(&priv->write_fifo,
739 &port->interrupt_out_buffer[offset],
740 port->interrupt_out_size - offset,
745 switch (priv->pkt_fmt) {
747 case packet_format_1:
748 port->interrupt_out_buffer[1] = count;
750 case packet_format_2:
751 port->interrupt_out_buffer[0] |= count;
754 dev_dbg(dev, "%s - count is %d\n", __func__, count);
757 spin_lock_irqsave(&priv->lock, flags);
758 priv->write_urb_in_use = 1;
759 spin_unlock_irqrestore(&priv->lock, flags);
764 actual_size = count +
765 (priv->pkt_fmt == packet_format_1 ? 2 : 1);
767 usb_serial_debug_data(dev, __func__, port->interrupt_out_size,
768 port->interrupt_out_urb->transfer_buffer);
770 usb_fill_int_urb(port->interrupt_out_urb, port->serial->dev,
771 usb_sndintpipe(port->serial->dev, port->interrupt_out_endpointAddress),
772 port->interrupt_out_buffer, actual_size,
773 cypress_write_int_callback, port, priv->write_urb_interval);
774 result = usb_submit_urb(port->interrupt_out_urb, GFP_ATOMIC);
776 dev_err_console(port,
777 "%s - failed submitting write urb, error %d\n",
779 priv->write_urb_in_use = 0;
780 cypress_set_dead(port);
783 spin_lock_irqsave(&priv->lock, flags);
787 /* do not count the line control and size bytes */
788 priv->bytes_out += count;
789 spin_unlock_irqrestore(&priv->lock, flags);
791 usb_serial_port_softint(port);
795 /* returns how much space is available in the soft buffer */
796 static int cypress_write_room(struct tty_struct *tty)
798 struct usb_serial_port *port = tty->driver_data;
799 struct cypress_private *priv = usb_get_serial_port_data(port);
803 spin_lock_irqsave(&priv->lock, flags);
804 room = kfifo_avail(&priv->write_fifo);
805 spin_unlock_irqrestore(&priv->lock, flags);
807 dev_dbg(&port->dev, "%s - returns %d\n", __func__, room);
812 static int cypress_tiocmget(struct tty_struct *tty)
814 struct usb_serial_port *port = tty->driver_data;
815 struct cypress_private *priv = usb_get_serial_port_data(port);
816 __u8 status, control;
817 unsigned int result = 0;
820 spin_lock_irqsave(&priv->lock, flags);
821 control = priv->line_control;
822 status = priv->current_status;
823 spin_unlock_irqrestore(&priv->lock, flags);
825 result = ((control & CONTROL_DTR) ? TIOCM_DTR : 0)
826 | ((control & CONTROL_RTS) ? TIOCM_RTS : 0)
827 | ((status & UART_CTS) ? TIOCM_CTS : 0)
828 | ((status & UART_DSR) ? TIOCM_DSR : 0)
829 | ((status & UART_RI) ? TIOCM_RI : 0)
830 | ((status & UART_CD) ? TIOCM_CD : 0);
832 dev_dbg(&port->dev, "%s - result = %x\n", __func__, result);
838 static int cypress_tiocmset(struct tty_struct *tty,
839 unsigned int set, unsigned int clear)
841 struct usb_serial_port *port = tty->driver_data;
842 struct cypress_private *priv = usb_get_serial_port_data(port);
845 spin_lock_irqsave(&priv->lock, flags);
847 priv->line_control |= CONTROL_RTS;
849 priv->line_control |= CONTROL_DTR;
850 if (clear & TIOCM_RTS)
851 priv->line_control &= ~CONTROL_RTS;
852 if (clear & TIOCM_DTR)
853 priv->line_control &= ~CONTROL_DTR;
855 spin_unlock_irqrestore(&priv->lock, flags);
857 return cypress_write(tty, port, NULL, 0);
860 static void cypress_set_termios(struct tty_struct *tty,
861 struct usb_serial_port *port, struct ktermios *old_termios)
863 struct cypress_private *priv = usb_get_serial_port_data(port);
864 struct device *dev = &port->dev;
865 int data_bits, stop_bits, parity_type, parity_enable;
871 spin_lock_irqsave(&priv->lock, flags);
872 /* We can't clean this one up as we don't know the device type
874 if (!priv->termios_initialized) {
875 if (priv->chiptype == CT_EARTHMATE) {
876 tty->termios = tty_std_termios;
877 tty->termios.c_cflag = B4800 | CS8 | CREAD | HUPCL |
879 tty->termios.c_ispeed = 4800;
880 tty->termios.c_ospeed = 4800;
881 } else if (priv->chiptype == CT_CYPHIDCOM) {
882 tty->termios = tty_std_termios;
883 tty->termios.c_cflag = B9600 | CS8 | CREAD | HUPCL |
885 tty->termios.c_ispeed = 9600;
886 tty->termios.c_ospeed = 9600;
887 } else if (priv->chiptype == CT_CA42V2) {
888 tty->termios = tty_std_termios;
889 tty->termios.c_cflag = B9600 | CS8 | CREAD | HUPCL |
891 tty->termios.c_ispeed = 9600;
892 tty->termios.c_ospeed = 9600;
894 priv->termios_initialized = 1;
896 spin_unlock_irqrestore(&priv->lock, flags);
898 /* Unsupported features need clearing */
899 tty->termios.c_cflag &= ~(CMSPAR|CRTSCTS);
901 cflag = tty->termios.c_cflag;
903 /* check if there are new settings */
905 spin_lock_irqsave(&priv->lock, flags);
906 priv->tmp_termios = tty->termios;
907 spin_unlock_irqrestore(&priv->lock, flags);
910 /* set number of data bits, parity, stop bits */
911 /* when parity is disabled the parity type bit is ignored */
913 /* 1 means 2 stop bits, 0 means 1 stop bit */
914 stop_bits = cflag & CSTOPB ? 1 : 0;
916 if (cflag & PARENB) {
918 /* 1 means odd parity, 0 means even parity */
919 parity_type = cflag & PARODD ? 1 : 0;
921 parity_enable = parity_type = 0;
923 switch (cflag & CSIZE) {
937 dev_err(dev, "%s - CSIZE was set, but not CS5-CS8\n", __func__);
940 spin_lock_irqsave(&priv->lock, flags);
941 oldlines = priv->line_control;
942 if ((cflag & CBAUD) == B0) {
943 /* drop dtr and rts */
944 dev_dbg(dev, "%s - dropping the lines, baud rate 0bps\n", __func__);
945 priv->line_control &= ~(CONTROL_DTR | CONTROL_RTS);
947 priv->line_control = (CONTROL_DTR | CONTROL_RTS);
948 spin_unlock_irqrestore(&priv->lock, flags);
950 dev_dbg(dev, "%s - sending %d stop_bits, %d parity_enable, %d parity_type, %d data_bits (+5)\n",
951 __func__, stop_bits, parity_enable, parity_type, data_bits);
953 cypress_serial_control(tty, port, tty_get_baud_rate(tty),
954 data_bits, stop_bits,
955 parity_enable, parity_type,
956 0, CYPRESS_SET_CONFIG);
958 /* we perform a CYPRESS_GET_CONFIG so that the current settings are
959 * filled into the private structure this should confirm that all is
960 * working if it returns what we just set */
961 cypress_serial_control(tty, port, 0, 0, 0, 0, 0, 0, CYPRESS_GET_CONFIG);
963 /* Here we can define custom tty settings for devices; the main tty
964 * termios flag base comes from empeg.c */
966 spin_lock_irqsave(&priv->lock, flags);
967 if (priv->chiptype == CT_EARTHMATE && priv->baud_rate == 4800) {
968 dev_dbg(dev, "Using custom termios settings for a baud rate of 4800bps.\n");
969 /* define custom termios settings for NMEA protocol */
971 tty->termios.c_iflag /* input modes - */
972 &= ~(IGNBRK /* disable ignore break */
973 | BRKINT /* disable break causes interrupt */
974 | PARMRK /* disable mark parity errors */
975 | ISTRIP /* disable clear high bit of input char */
976 | INLCR /* disable translate NL to CR */
977 | IGNCR /* disable ignore CR */
978 | ICRNL /* disable translate CR to NL */
979 | IXON); /* disable enable XON/XOFF flow control */
981 tty->termios.c_oflag /* output modes */
982 &= ~OPOST; /* disable postprocess output char */
984 tty->termios.c_lflag /* line discipline modes */
985 &= ~(ECHO /* disable echo input characters */
986 | ECHONL /* disable echo new line */
987 | ICANON /* disable erase, kill, werase, and rprnt
988 special characters */
989 | ISIG /* disable interrupt, quit, and suspend
990 special characters */
991 | IEXTEN); /* disable non-POSIX special characters */
992 } /* CT_CYPHIDCOM: Application should handle this for device */
994 linechange = (priv->line_control != oldlines);
995 spin_unlock_irqrestore(&priv->lock, flags);
997 /* if necessary, set lines */
1000 cypress_write(tty, port, NULL, 0);
1002 } /* cypress_set_termios */
1005 /* returns amount of data still left in soft buffer */
1006 static int cypress_chars_in_buffer(struct tty_struct *tty)
1008 struct usb_serial_port *port = tty->driver_data;
1009 struct cypress_private *priv = usb_get_serial_port_data(port);
1011 unsigned long flags;
1013 spin_lock_irqsave(&priv->lock, flags);
1014 chars = kfifo_len(&priv->write_fifo);
1015 spin_unlock_irqrestore(&priv->lock, flags);
1017 dev_dbg(&port->dev, "%s - returns %d\n", __func__, chars);
1022 static void cypress_throttle(struct tty_struct *tty)
1024 struct usb_serial_port *port = tty->driver_data;
1025 struct cypress_private *priv = usb_get_serial_port_data(port);
1027 spin_lock_irq(&priv->lock);
1028 priv->rx_flags = THROTTLED;
1029 spin_unlock_irq(&priv->lock);
1033 static void cypress_unthrottle(struct tty_struct *tty)
1035 struct usb_serial_port *port = tty->driver_data;
1036 struct cypress_private *priv = usb_get_serial_port_data(port);
1037 int actually_throttled, result;
1039 spin_lock_irq(&priv->lock);
1040 actually_throttled = priv->rx_flags & ACTUALLY_THROTTLED;
1042 spin_unlock_irq(&priv->lock);
1044 if (!priv->comm_is_ok)
1047 if (actually_throttled) {
1048 result = usb_submit_urb(port->interrupt_in_urb, GFP_KERNEL);
1050 dev_err(&port->dev, "%s - failed submitting read urb, "
1051 "error %d\n", __func__, result);
1052 cypress_set_dead(port);
1058 static void cypress_read_int_callback(struct urb *urb)
1060 struct usb_serial_port *port = urb->context;
1061 struct cypress_private *priv = usb_get_serial_port_data(port);
1062 struct device *dev = &urb->dev->dev;
1063 struct tty_struct *tty;
1064 unsigned char *data = urb->transfer_buffer;
1065 unsigned long flags;
1066 char tty_flag = TTY_NORMAL;
1070 int status = urb->status;
1073 case 0: /* success */
1078 /* precursor to disconnect so just go away */
1081 /* Can't call usb_clear_halt while in_interrupt */
1084 /* something ugly is going on... */
1085 dev_err(dev, "%s - unexpected nonzero read status received: %d\n",
1087 cypress_set_dead(port);
1091 spin_lock_irqsave(&priv->lock, flags);
1092 if (priv->rx_flags & THROTTLED) {
1093 dev_dbg(dev, "%s - now throttling\n", __func__);
1094 priv->rx_flags |= ACTUALLY_THROTTLED;
1095 spin_unlock_irqrestore(&priv->lock, flags);
1098 spin_unlock_irqrestore(&priv->lock, flags);
1100 tty = tty_port_tty_get(&port->port);
1102 dev_dbg(dev, "%s - bad tty pointer - exiting\n", __func__);
1106 spin_lock_irqsave(&priv->lock, flags);
1107 result = urb->actual_length;
1108 switch (priv->pkt_fmt) {
1110 case packet_format_1:
1111 /* This is for the CY7C64013... */
1112 priv->current_status = data[0] & 0xF8;
1113 bytes = data[1] + 2;
1116 case packet_format_2:
1117 /* This is for the CY7C63743... */
1118 priv->current_status = data[0] & 0xF8;
1119 bytes = (data[0] & 0x07) + 1;
1123 spin_unlock_irqrestore(&priv->lock, flags);
1124 if (result < bytes) {
1126 "%s - wrong packet size - received %d bytes but packet said %d bytes\n",
1127 __func__, result, bytes);
1131 usb_serial_debug_data(&port->dev, __func__, urb->actual_length, data);
1133 spin_lock_irqsave(&priv->lock, flags);
1134 /* check to see if status has changed */
1135 if (priv->current_status != priv->prev_status) {
1136 u8 delta = priv->current_status ^ priv->prev_status;
1138 if (delta & UART_MSR_MASK) {
1139 if (delta & UART_CTS)
1141 if (delta & UART_DSR)
1143 if (delta & UART_RI)
1145 if (delta & UART_CD)
1148 wake_up_interruptible(&port->port.delta_msr_wait);
1151 priv->prev_status = priv->current_status;
1153 spin_unlock_irqrestore(&priv->lock, flags);
1155 /* hangup, as defined in acm.c... this might be a bad place for it
1157 if (tty && !C_CLOCAL(tty) && !(priv->current_status & UART_CD)) {
1158 dev_dbg(dev, "%s - calling hangup\n", __func__);
1163 /* There is one error bit... I'm assuming it is a parity error
1164 * indicator as the generic firmware will set this bit to 1 if a
1165 * parity error occurs.
1166 * I can not find reference to any other error events. */
1167 spin_lock_irqsave(&priv->lock, flags);
1168 if (priv->current_status & CYP_ERROR) {
1169 spin_unlock_irqrestore(&priv->lock, flags);
1170 tty_flag = TTY_PARITY;
1171 dev_dbg(dev, "%s - Parity Error detected\n", __func__);
1173 spin_unlock_irqrestore(&priv->lock, flags);
1175 /* process read if there is data other than line status */
1177 tty_insert_flip_string_fixed_flag(&port->port, data + i,
1178 tty_flag, bytes - i);
1179 tty_flip_buffer_push(&port->port);
1182 spin_lock_irqsave(&priv->lock, flags);
1183 /* control and status byte(s) are also counted */
1184 priv->bytes_in += bytes;
1185 spin_unlock_irqrestore(&priv->lock, flags);
1190 /* Continue trying to always read */
1192 if (priv->comm_is_ok) {
1193 usb_fill_int_urb(port->interrupt_in_urb, port->serial->dev,
1194 usb_rcvintpipe(port->serial->dev,
1195 port->interrupt_in_endpointAddress),
1196 port->interrupt_in_urb->transfer_buffer,
1197 port->interrupt_in_urb->transfer_buffer_length,
1198 cypress_read_int_callback, port,
1199 priv->read_urb_interval);
1200 result = usb_submit_urb(port->interrupt_in_urb, GFP_ATOMIC);
1201 if (result && result != -EPERM) {
1202 dev_err(dev, "%s - failed resubmitting read urb, error %d\n",
1204 cypress_set_dead(port);
1207 } /* cypress_read_int_callback */
1210 static void cypress_write_int_callback(struct urb *urb)
1212 struct usb_serial_port *port = urb->context;
1213 struct cypress_private *priv = usb_get_serial_port_data(port);
1214 struct device *dev = &urb->dev->dev;
1215 int status = urb->status;
1224 /* this urb is terminated, clean up */
1225 dev_dbg(dev, "%s - urb shutting down with status: %d\n",
1227 priv->write_urb_in_use = 0;
1230 /* Cannot call usb_clear_halt while in_interrupt */
1233 dev_err(dev, "%s - unexpected nonzero write status received: %d\n",
1235 cypress_set_dead(port);
1238 priv->write_urb_in_use = 0;
1240 /* send any buffered data */
1244 module_usb_serial_driver(serial_drivers, id_table_combined);
1246 MODULE_AUTHOR(DRIVER_AUTHOR);
1247 MODULE_DESCRIPTION(DRIVER_DESC);
1248 MODULE_LICENSE("GPL");
1250 module_param(stats, bool, S_IRUGO | S_IWUSR);
1251 MODULE_PARM_DESC(stats, "Enable statistics or not");
1252 module_param(interval, int, S_IRUGO | S_IWUSR);
1253 MODULE_PARM_DESC(interval, "Overrides interrupt interval");
1254 module_param(unstable_bauds, bool, S_IRUGO | S_IWUSR);
1255 MODULE_PARM_DESC(unstable_bauds, "Allow unstable baud rates");