1 | // SPDX-License-Identifier: GPL-2.0+ |
2 | /* |
3 | * USB Cypress M8 driver |
4 | * |
5 | * Copyright (C) 2004 |
6 | * Lonnie Mendez (dignome@gmail.com) |
7 | * Copyright (C) 2003,2004 |
8 | * Neil Whelchel (koyama@firstlight.net) |
9 | * |
10 | * See Documentation/usb/usb-serial.rst for more information on using this |
11 | * driver |
12 | * |
13 | * See http://geocities.com/i0xox0i for information on this driver and the |
14 | * earthmate usb device. |
15 | */ |
16 | |
17 | /* Thanks to Neil Whelchel for writing the first cypress m8 implementation |
18 | for linux. */ |
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.*/ |
22 | |
23 | |
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> |
40 | |
41 | #include "cypress_m8.h" |
42 | |
43 | |
44 | static bool stats; |
45 | static int interval; |
46 | static bool unstable_bauds; |
47 | |
48 | #define DRIVER_AUTHOR "Lonnie Mendez <dignome@gmail.com>, Neil Whelchel <koyama@firstlight.net>" |
49 | #define DRIVER_DESC "Cypress USB to Serial Driver" |
50 | |
51 | /* write buffer size defines */ |
52 | #define CYPRESS_BUF_SIZE 1024 |
53 | |
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 */ |
58 | }; |
59 | |
60 | static const struct usb_device_id id_table_cyphidcomrs232[] = { |
61 | { USB_DEVICE(VENDOR_ID_CYPRESS, PRODUCT_ID_CYPHIDCOM) }, |
62 | { USB_DEVICE(VENDOR_ID_SAI, PRODUCT_ID_CYPHIDCOM) }, |
63 | { USB_DEVICE(VENDOR_ID_POWERCOM, PRODUCT_ID_UPS) }, |
64 | { USB_DEVICE(VENDOR_ID_FRWD, PRODUCT_ID_CYPHIDCOM_FRWD) }, |
65 | { } /* Terminating entry */ |
66 | }; |
67 | |
68 | static const struct usb_device_id id_table_nokiaca42v2[] = { |
69 | { USB_DEVICE(VENDOR_ID_DAZZLE, PRODUCT_ID_CA42) }, |
70 | { } /* Terminating entry */ |
71 | }; |
72 | |
73 | static const struct usb_device_id id_table_combined[] = { |
74 | { USB_DEVICE(VENDOR_ID_DELORME, PRODUCT_ID_EARTHMATEUSB) }, |
75 | { USB_DEVICE(VENDOR_ID_DELORME, PRODUCT_ID_EARTHMATEUSB_LT20) }, |
76 | { USB_DEVICE(VENDOR_ID_CYPRESS, PRODUCT_ID_CYPHIDCOM) }, |
77 | { USB_DEVICE(VENDOR_ID_SAI, PRODUCT_ID_CYPHIDCOM) }, |
78 | { USB_DEVICE(VENDOR_ID_POWERCOM, PRODUCT_ID_UPS) }, |
79 | { USB_DEVICE(VENDOR_ID_FRWD, PRODUCT_ID_CYPHIDCOM_FRWD) }, |
80 | { USB_DEVICE(VENDOR_ID_DAZZLE, PRODUCT_ID_CA42) }, |
81 | { } /* Terminating entry */ |
82 | }; |
83 | |
84 | MODULE_DEVICE_TABLE(usb, id_table_combined); |
85 | |
86 | enum packet_format { |
87 | packet_format_1, /* b0:status, b1:payload count */ |
88 | packet_format_2 /* b0[7:3]:status, b0[2:0]:payload count */ |
89 | }; |
90 | |
91 | struct cypress_private { |
92 | spinlock_t lock; /* private lock */ |
93 | int chiptype; /* identifier of device, for quirks/etc */ |
94 | int bytes_in; /* used for statistics */ |
95 | int bytes_out; /* used for statistics */ |
96 | int cmd_count; /* used for statistics */ |
97 | int cmd_ctrl; /* always set this to 1 before issuing a command */ |
98 | struct kfifo write_fifo; /* write fifo */ |
99 | int write_urb_in_use; /* write urb in use indicator */ |
100 | int write_urb_interval; /* interval to use for write urb */ |
101 | int read_urb_interval; /* interval to use for read urb */ |
102 | int comm_is_ok; /* true if communication is (still) ok */ |
103 | __u8 line_control; /* holds dtr / rts value */ |
104 | __u8 current_status; /* received from last read - info on dsr,cts,cd,ri,etc */ |
105 | __u8 current_config; /* stores the current configuration byte */ |
106 | __u8 rx_flags; /* throttling - used from whiteheat/ftdi_sio */ |
107 | enum packet_format pkt_fmt; /* format to use for packet send / receive */ |
108 | int get_cfg_unsafe; /* If true, the CYPRESS_GET_CONFIG is unsafe */ |
109 | int baud_rate; /* stores current baud rate in |
110 | integer form */ |
111 | char prev_status; /* used for TIOCMIWAIT */ |
112 | }; |
113 | |
114 | /* function prototypes for the Cypress USB to serial device */ |
115 | static int cypress_earthmate_port_probe(struct usb_serial_port *port); |
116 | static int cypress_hidcom_port_probe(struct usb_serial_port *port); |
117 | static int cypress_ca42v2_port_probe(struct usb_serial_port *port); |
118 | static void cypress_port_remove(struct usb_serial_port *port); |
119 | static int cypress_open(struct tty_struct *tty, struct usb_serial_port *port); |
120 | static void cypress_close(struct usb_serial_port *port); |
121 | static void cypress_dtr_rts(struct usb_serial_port *port, int on); |
122 | static int cypress_write(struct tty_struct *tty, struct usb_serial_port *port, |
123 | const unsigned char *buf, int count); |
124 | static void cypress_send(struct usb_serial_port *port); |
125 | static unsigned int cypress_write_room(struct tty_struct *tty); |
126 | static void cypress_earthmate_init_termios(struct tty_struct *tty); |
127 | static void cypress_set_termios(struct tty_struct *tty, |
128 | struct usb_serial_port *port, |
129 | const struct ktermios *old_termios); |
130 | static int cypress_tiocmget(struct tty_struct *tty); |
131 | static int cypress_tiocmset(struct tty_struct *tty, |
132 | unsigned int set, unsigned int clear); |
133 | static unsigned int cypress_chars_in_buffer(struct tty_struct *tty); |
134 | static void cypress_throttle(struct tty_struct *tty); |
135 | static void cypress_unthrottle(struct tty_struct *tty); |
136 | static void cypress_set_dead(struct usb_serial_port *port); |
137 | static void cypress_read_int_callback(struct urb *urb); |
138 | static void cypress_write_int_callback(struct urb *urb); |
139 | |
140 | static struct usb_serial_driver cypress_earthmate_device = { |
141 | .driver = { |
142 | .owner = THIS_MODULE, |
143 | .name = "earthmate" , |
144 | }, |
145 | .description = "DeLorme Earthmate USB" , |
146 | .id_table = id_table_earthmate, |
147 | .num_ports = 1, |
148 | .port_probe = cypress_earthmate_port_probe, |
149 | .port_remove = cypress_port_remove, |
150 | .open = cypress_open, |
151 | .close = cypress_close, |
152 | .dtr_rts = cypress_dtr_rts, |
153 | .write = cypress_write, |
154 | .write_room = cypress_write_room, |
155 | .init_termios = cypress_earthmate_init_termios, |
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, |
165 | }; |
166 | |
167 | static struct usb_serial_driver cypress_hidcom_device = { |
168 | .driver = { |
169 | .owner = THIS_MODULE, |
170 | .name = "cyphidcom" , |
171 | }, |
172 | .description = "HID->COM RS232 Adapter" , |
173 | .id_table = id_table_cyphidcomrs232, |
174 | .num_ports = 1, |
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, |
191 | }; |
192 | |
193 | static struct usb_serial_driver cypress_ca42v2_device = { |
194 | .driver = { |
195 | .owner = THIS_MODULE, |
196 | .name = "nokiaca42v2" , |
197 | }, |
198 | .description = "Nokia CA-42 V2 Adapter" , |
199 | .id_table = id_table_nokiaca42v2, |
200 | .num_ports = 1, |
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, |
217 | }; |
218 | |
219 | static struct usb_serial_driver * const serial_drivers[] = { |
220 | &cypress_earthmate_device, &cypress_hidcom_device, |
221 | &cypress_ca42v2_device, NULL |
222 | }; |
223 | |
224 | /***************************************************************************** |
225 | * Cypress serial helper functions |
226 | *****************************************************************************/ |
227 | |
228 | /* FRWD Dongle hidcom needs to skip reset and speed checks */ |
229 | static inline bool is_frwd(struct usb_device *dev) |
230 | { |
231 | return ((le16_to_cpu(dev->descriptor.idVendor) == VENDOR_ID_FRWD) && |
232 | (le16_to_cpu(dev->descriptor.idProduct) == PRODUCT_ID_CYPHIDCOM_FRWD)); |
233 | } |
234 | |
235 | static int analyze_baud_rate(struct usb_serial_port *port, speed_t new_rate) |
236 | { |
237 | struct cypress_private *priv; |
238 | priv = usb_get_serial_port_data(port); |
239 | |
240 | if (unstable_bauds) |
241 | return new_rate; |
242 | |
243 | /* FRWD Dongle uses 115200 bps */ |
244 | if (is_frwd(dev: port->serial->dev)) |
245 | return new_rate; |
246 | |
247 | /* |
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). |
255 | */ |
256 | if (port->serial->dev->speed == USB_SPEED_LOW) { |
257 | /* |
258 | * Mike Isely <isely@pobox.com> 2-Feb-2008: The |
259 | * Cypress app note that describes this mechanism |
260 | * states that 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. |
263 | */ |
264 | if (new_rate > 4800) { |
265 | dev_dbg(&port->dev, |
266 | "%s - failed setting baud rate, device incapable speed %d\n" , |
267 | __func__, new_rate); |
268 | return -1; |
269 | } |
270 | } |
271 | switch (priv->chiptype) { |
272 | case CT_EARTHMATE: |
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 */ |
277 | dev_dbg(&port->dev, |
278 | "%s - failed setting baud rate, unsupported speed of %d on Earthmate GPS\n" , |
279 | __func__, new_rate); |
280 | return -1; |
281 | } |
282 | break; |
283 | default: |
284 | break; |
285 | } |
286 | return new_rate; |
287 | } |
288 | |
289 | |
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) |
295 | { |
296 | int new_baudrate = 0, retval = 0, tries = 0; |
297 | struct cypress_private *priv; |
298 | struct device *dev = &port->dev; |
299 | u8 *feature_buffer; |
300 | const unsigned int feature_len = 5; |
301 | unsigned long flags; |
302 | |
303 | priv = usb_get_serial_port_data(port); |
304 | |
305 | if (!priv->comm_is_ok) |
306 | return -ENODEV; |
307 | |
308 | feature_buffer = kcalloc(n: feature_len, size: sizeof(u8), GFP_KERNEL); |
309 | if (!feature_buffer) |
310 | return -ENOMEM; |
311 | |
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, new_rate: baud_rate); |
319 | if (retval >= 0) { |
320 | new_baudrate = retval; |
321 | dev_dbg(dev, "%s - New baud rate set to %d\n" , |
322 | __func__, new_baudrate); |
323 | } |
324 | } |
325 | dev_dbg(dev, "%s - baud rate is being sent as %d\n" , __func__, |
326 | new_baudrate); |
327 | |
328 | /* fill the feature_buffer with new configuration */ |
329 | put_unaligned_le32(val: new_baudrate, p: feature_buffer); |
330 | feature_buffer[4] |= data_bits - 5; /* assign data bits in 2 bit space ( max 3 ) */ |
331 | /* 1 bit gap */ |
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 */ |
335 | /* 1 bit gap */ |
336 | feature_buffer[4] |= (reset << 7); /* assign reset at end of byte, 1 bit space */ |
337 | |
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], |
342 | feature_buffer[4]); |
343 | |
344 | do { |
345 | retval = usb_control_msg(dev: port->serial->dev, |
346 | usb_sndctrlpipe(port->serial->dev, 0), |
347 | HID_REQ_SET_REPORT, |
348 | USB_DIR_OUT | USB_RECIP_INTERFACE | USB_TYPE_CLASS, |
349 | value: 0x0300, index: 0, data: feature_buffer, |
350 | size: feature_len, timeout: 500); |
351 | |
352 | if (tries++ >= 3) |
353 | break; |
354 | |
355 | } while (retval != feature_len && |
356 | retval != -ENODEV); |
357 | |
358 | if (retval != feature_len) { |
359 | dev_err(dev, "%s - failed sending serial line settings - %d\n" , |
360 | __func__, retval); |
361 | cypress_set_dead(port); |
362 | } else { |
363 | spin_lock_irqsave(&priv->lock, flags); |
364 | priv->baud_rate = new_baudrate; |
365 | priv->current_config = feature_buffer[4]; |
366 | spin_unlock_irqrestore(lock: &priv->lock, flags); |
367 | /* If we asked for a speed change encode it */ |
368 | if (baud_rate) |
369 | tty_encode_baud_rate(tty, |
370 | ibaud: new_baudrate, obaud: new_baudrate); |
371 | } |
372 | break; |
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. */ |
378 | retval = -ENOTTY; |
379 | goto out; |
380 | } |
381 | dev_dbg(dev, "%s - retrieving serial line settings\n" , __func__); |
382 | do { |
383 | retval = usb_control_msg(dev: port->serial->dev, |
384 | usb_rcvctrlpipe(port->serial->dev, 0), |
385 | HID_REQ_GET_REPORT, |
386 | USB_DIR_IN | USB_RECIP_INTERFACE | USB_TYPE_CLASS, |
387 | value: 0x0300, index: 0, data: feature_buffer, |
388 | size: feature_len, timeout: 500); |
389 | |
390 | if (tries++ >= 3) |
391 | break; |
392 | } while (retval != feature_len |
393 | && retval != -ENODEV); |
394 | |
395 | if (retval != feature_len) { |
396 | dev_err(dev, "%s - failed to retrieve serial line settings - %d\n" , |
397 | __func__, retval); |
398 | cypress_set_dead(port); |
399 | goto out; |
400 | } else { |
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(p: feature_buffer); |
406 | spin_unlock_irqrestore(lock: &priv->lock, flags); |
407 | } |
408 | } |
409 | spin_lock_irqsave(&priv->lock, flags); |
410 | ++priv->cmd_count; |
411 | spin_unlock_irqrestore(lock: &priv->lock, flags); |
412 | out: |
413 | kfree(objp: feature_buffer); |
414 | return retval; |
415 | } /* cypress_serial_control */ |
416 | |
417 | |
418 | static void cypress_set_dead(struct usb_serial_port *port) |
419 | { |
420 | struct cypress_private *priv = usb_get_serial_port_data(port); |
421 | unsigned long flags; |
422 | |
423 | spin_lock_irqsave(&priv->lock, flags); |
424 | if (!priv->comm_is_ok) { |
425 | spin_unlock_irqrestore(lock: &priv->lock, flags); |
426 | return; |
427 | } |
428 | priv->comm_is_ok = 0; |
429 | spin_unlock_irqrestore(lock: &priv->lock, flags); |
430 | |
431 | dev_err(&port->dev, "cypress_m8 suspending failing port %d - " |
432 | "interval might be too short\n" , port->port_number); |
433 | } |
434 | |
435 | |
436 | /***************************************************************************** |
437 | * Cypress serial driver functions |
438 | *****************************************************************************/ |
439 | |
440 | |
441 | static int cypress_generic_port_probe(struct usb_serial_port *port) |
442 | { |
443 | struct usb_serial *serial = port->serial; |
444 | struct cypress_private *priv; |
445 | |
446 | if (!port->interrupt_out_urb || !port->interrupt_in_urb) { |
447 | dev_err(&port->dev, "required endpoint is missing\n" ); |
448 | return -ENODEV; |
449 | } |
450 | |
451 | priv = kzalloc(size: sizeof(struct cypress_private), GFP_KERNEL); |
452 | if (!priv) |
453 | return -ENOMEM; |
454 | |
455 | priv->comm_is_ok = !0; |
456 | spin_lock_init(&priv->lock); |
457 | if (kfifo_alloc(&priv->write_fifo, CYPRESS_BUF_SIZE, GFP_KERNEL)) { |
458 | kfree(objp: priv); |
459 | return -ENOMEM; |
460 | } |
461 | |
462 | /* Skip reset for FRWD device. It is a workaound: |
463 | device hangs if it receives SET_CONFIGURE in Configured |
464 | state. */ |
465 | if (!is_frwd(dev: serial->dev)) |
466 | usb_reset_configuration(dev: serial->dev); |
467 | |
468 | priv->cmd_ctrl = 0; |
469 | priv->line_control = 0; |
470 | priv->rx_flags = 0; |
471 | /* Default packet format setting is determined by packet size. |
472 | Anything with a size larger then 9 must have a separate |
473 | count field since the 3 bit count field is otherwise too |
474 | small. Otherwise we can use the slightly more compact |
475 | format. This is in accordance with the cypress_m8 serial |
476 | converter app note. */ |
477 | if (port->interrupt_out_size > 9) |
478 | priv->pkt_fmt = packet_format_1; |
479 | else |
480 | priv->pkt_fmt = packet_format_2; |
481 | |
482 | if (interval > 0) { |
483 | priv->write_urb_interval = interval; |
484 | priv->read_urb_interval = interval; |
485 | dev_dbg(&port->dev, "%s - read & write intervals forced to %d\n" , |
486 | __func__, interval); |
487 | } else { |
488 | priv->write_urb_interval = port->interrupt_out_urb->interval; |
489 | priv->read_urb_interval = port->interrupt_in_urb->interval; |
490 | dev_dbg(&port->dev, "%s - intervals: read=%d write=%d\n" , |
491 | __func__, priv->read_urb_interval, |
492 | priv->write_urb_interval); |
493 | } |
494 | usb_set_serial_port_data(port, data: priv); |
495 | |
496 | port->port.drain_delay = 256; |
497 | |
498 | return 0; |
499 | } |
500 | |
501 | |
502 | static int cypress_earthmate_port_probe(struct usb_serial_port *port) |
503 | { |
504 | struct usb_serial *serial = port->serial; |
505 | struct cypress_private *priv; |
506 | int ret; |
507 | |
508 | ret = cypress_generic_port_probe(port); |
509 | if (ret) { |
510 | dev_dbg(&port->dev, "%s - Failed setting up port\n" , __func__); |
511 | return ret; |
512 | } |
513 | |
514 | priv = usb_get_serial_port_data(port); |
515 | priv->chiptype = CT_EARTHMATE; |
516 | /* All Earthmate devices use the separated-count packet |
517 | format! Idiotic. */ |
518 | priv->pkt_fmt = packet_format_1; |
519 | if (serial->dev->descriptor.idProduct != |
520 | cpu_to_le16(PRODUCT_ID_EARTHMATEUSB)) { |
521 | /* The old original USB Earthmate seemed able to |
522 | handle GET_CONFIG requests; everything they've |
523 | produced since that time crashes if this command is |
524 | attempted :-( */ |
525 | dev_dbg(&port->dev, |
526 | "%s - Marking this device as unsafe for GET_CONFIG commands\n" , |
527 | __func__); |
528 | priv->get_cfg_unsafe = !0; |
529 | } |
530 | |
531 | return 0; |
532 | } |
533 | |
534 | static int cypress_hidcom_port_probe(struct usb_serial_port *port) |
535 | { |
536 | struct cypress_private *priv; |
537 | int ret; |
538 | |
539 | ret = cypress_generic_port_probe(port); |
540 | if (ret) { |
541 | dev_dbg(&port->dev, "%s - Failed setting up port\n" , __func__); |
542 | return ret; |
543 | } |
544 | |
545 | priv = usb_get_serial_port_data(port); |
546 | priv->chiptype = CT_CYPHIDCOM; |
547 | |
548 | return 0; |
549 | } |
550 | |
551 | static int cypress_ca42v2_port_probe(struct usb_serial_port *port) |
552 | { |
553 | struct cypress_private *priv; |
554 | int ret; |
555 | |
556 | ret = cypress_generic_port_probe(port); |
557 | if (ret) { |
558 | dev_dbg(&port->dev, "%s - Failed setting up port\n" , __func__); |
559 | return ret; |
560 | } |
561 | |
562 | priv = usb_get_serial_port_data(port); |
563 | priv->chiptype = CT_CA42V2; |
564 | |
565 | return 0; |
566 | } |
567 | |
568 | static void cypress_port_remove(struct usb_serial_port *port) |
569 | { |
570 | struct cypress_private *priv; |
571 | |
572 | priv = usb_get_serial_port_data(port); |
573 | |
574 | kfifo_free(&priv->write_fifo); |
575 | kfree(objp: priv); |
576 | } |
577 | |
578 | static int cypress_open(struct tty_struct *tty, struct usb_serial_port *port) |
579 | { |
580 | struct cypress_private *priv = usb_get_serial_port_data(port); |
581 | struct usb_serial *serial = port->serial; |
582 | unsigned long flags; |
583 | int result = 0; |
584 | |
585 | if (!priv->comm_is_ok) |
586 | return -EIO; |
587 | |
588 | /* clear halts before open */ |
589 | usb_clear_halt(dev: serial->dev, pipe: 0x81); |
590 | usb_clear_halt(dev: serial->dev, pipe: 0x02); |
591 | |
592 | spin_lock_irqsave(&priv->lock, flags); |
593 | /* reset read/write statistics */ |
594 | priv->bytes_in = 0; |
595 | priv->bytes_out = 0; |
596 | priv->cmd_count = 0; |
597 | priv->rx_flags = 0; |
598 | spin_unlock_irqrestore(lock: &priv->lock, flags); |
599 | |
600 | /* Set termios */ |
601 | cypress_send(port); |
602 | |
603 | if (tty) |
604 | cypress_set_termios(tty, port, NULL); |
605 | |
606 | /* setup the port and start reading from the device */ |
607 | usb_fill_int_urb(urb: port->interrupt_in_urb, dev: serial->dev, |
608 | usb_rcvintpipe(serial->dev, port->interrupt_in_endpointAddress), |
609 | transfer_buffer: port->interrupt_in_urb->transfer_buffer, |
610 | buffer_length: port->interrupt_in_urb->transfer_buffer_length, |
611 | complete_fn: cypress_read_int_callback, context: port, interval: priv->read_urb_interval); |
612 | result = usb_submit_urb(urb: port->interrupt_in_urb, GFP_KERNEL); |
613 | |
614 | if (result) { |
615 | dev_err(&port->dev, |
616 | "%s - failed submitting read urb, error %d\n" , |
617 | __func__, result); |
618 | cypress_set_dead(port); |
619 | } |
620 | |
621 | return result; |
622 | } /* cypress_open */ |
623 | |
624 | static void cypress_dtr_rts(struct usb_serial_port *port, int on) |
625 | { |
626 | struct cypress_private *priv = usb_get_serial_port_data(port); |
627 | /* drop dtr and rts */ |
628 | spin_lock_irq(lock: &priv->lock); |
629 | if (on == 0) |
630 | priv->line_control = 0; |
631 | else |
632 | priv->line_control = CONTROL_DTR | CONTROL_RTS; |
633 | priv->cmd_ctrl = 1; |
634 | spin_unlock_irq(lock: &priv->lock); |
635 | cypress_write(NULL, port, NULL, count: 0); |
636 | } |
637 | |
638 | static void cypress_close(struct usb_serial_port *port) |
639 | { |
640 | struct cypress_private *priv = usb_get_serial_port_data(port); |
641 | unsigned long flags; |
642 | |
643 | spin_lock_irqsave(&priv->lock, flags); |
644 | kfifo_reset_out(&priv->write_fifo); |
645 | spin_unlock_irqrestore(lock: &priv->lock, flags); |
646 | |
647 | dev_dbg(&port->dev, "%s - stopping urbs\n" , __func__); |
648 | usb_kill_urb(urb: port->interrupt_in_urb); |
649 | usb_kill_urb(urb: port->interrupt_out_urb); |
650 | |
651 | if (stats) |
652 | dev_info(&port->dev, "Statistics: %d Bytes In | %d Bytes Out | %d Commands Issued\n" , |
653 | priv->bytes_in, priv->bytes_out, priv->cmd_count); |
654 | } /* cypress_close */ |
655 | |
656 | |
657 | static int cypress_write(struct tty_struct *tty, struct usb_serial_port *port, |
658 | const unsigned char *buf, int count) |
659 | { |
660 | struct cypress_private *priv = usb_get_serial_port_data(port); |
661 | |
662 | dev_dbg(&port->dev, "%s - %d bytes\n" , __func__, count); |
663 | |
664 | /* line control commands, which need to be executed immediately, |
665 | are not put into the buffer for obvious reasons. |
666 | */ |
667 | if (priv->cmd_ctrl) { |
668 | count = 0; |
669 | goto finish; |
670 | } |
671 | |
672 | if (!count) |
673 | return count; |
674 | |
675 | count = kfifo_in_locked(&priv->write_fifo, buf, count, &priv->lock); |
676 | |
677 | finish: |
678 | cypress_send(port); |
679 | |
680 | return count; |
681 | } /* cypress_write */ |
682 | |
683 | |
684 | static void cypress_send(struct usb_serial_port *port) |
685 | { |
686 | int count = 0, result, offset, actual_size; |
687 | struct cypress_private *priv = usb_get_serial_port_data(port); |
688 | struct device *dev = &port->dev; |
689 | unsigned long flags; |
690 | |
691 | if (!priv->comm_is_ok) |
692 | return; |
693 | |
694 | dev_dbg(dev, "%s - interrupt out size is %d\n" , __func__, |
695 | port->interrupt_out_size); |
696 | |
697 | spin_lock_irqsave(&priv->lock, flags); |
698 | if (priv->write_urb_in_use) { |
699 | dev_dbg(dev, "%s - can't write, urb in use\n" , __func__); |
700 | spin_unlock_irqrestore(lock: &priv->lock, flags); |
701 | return; |
702 | } |
703 | spin_unlock_irqrestore(lock: &priv->lock, flags); |
704 | |
705 | /* clear buffer */ |
706 | memset(port->interrupt_out_urb->transfer_buffer, 0, |
707 | port->interrupt_out_size); |
708 | |
709 | spin_lock_irqsave(&priv->lock, flags); |
710 | switch (priv->pkt_fmt) { |
711 | default: |
712 | case packet_format_1: |
713 | /* this is for the CY7C64013... */ |
714 | offset = 2; |
715 | port->interrupt_out_buffer[0] = priv->line_control; |
716 | break; |
717 | case packet_format_2: |
718 | /* this is for the CY7C63743... */ |
719 | offset = 1; |
720 | port->interrupt_out_buffer[0] = priv->line_control; |
721 | break; |
722 | } |
723 | |
724 | if (priv->line_control & CONTROL_RESET) |
725 | priv->line_control &= ~CONTROL_RESET; |
726 | |
727 | if (priv->cmd_ctrl) { |
728 | priv->cmd_count++; |
729 | dev_dbg(dev, "%s - line control command being issued\n" , __func__); |
730 | spin_unlock_irqrestore(lock: &priv->lock, flags); |
731 | goto send; |
732 | } else |
733 | spin_unlock_irqrestore(lock: &priv->lock, flags); |
734 | |
735 | count = kfifo_out_locked(&priv->write_fifo, |
736 | &port->interrupt_out_buffer[offset], |
737 | port->interrupt_out_size - offset, |
738 | &priv->lock); |
739 | if (count == 0) |
740 | return; |
741 | |
742 | switch (priv->pkt_fmt) { |
743 | default: |
744 | case packet_format_1: |
745 | port->interrupt_out_buffer[1] = count; |
746 | break; |
747 | case packet_format_2: |
748 | port->interrupt_out_buffer[0] |= count; |
749 | } |
750 | |
751 | dev_dbg(dev, "%s - count is %d\n" , __func__, count); |
752 | |
753 | send: |
754 | spin_lock_irqsave(&priv->lock, flags); |
755 | priv->write_urb_in_use = 1; |
756 | spin_unlock_irqrestore(lock: &priv->lock, flags); |
757 | |
758 | if (priv->cmd_ctrl) |
759 | actual_size = 1; |
760 | else |
761 | actual_size = count + |
762 | (priv->pkt_fmt == packet_format_1 ? 2 : 1); |
763 | |
764 | usb_serial_debug_data(dev, function: __func__, size: port->interrupt_out_size, |
765 | data: port->interrupt_out_urb->transfer_buffer); |
766 | |
767 | usb_fill_int_urb(urb: port->interrupt_out_urb, dev: port->serial->dev, |
768 | usb_sndintpipe(port->serial->dev, port->interrupt_out_endpointAddress), |
769 | transfer_buffer: port->interrupt_out_buffer, buffer_length: actual_size, |
770 | complete_fn: cypress_write_int_callback, context: port, interval: priv->write_urb_interval); |
771 | result = usb_submit_urb(urb: port->interrupt_out_urb, GFP_ATOMIC); |
772 | if (result) { |
773 | dev_err_console(port, |
774 | "%s - failed submitting write urb, error %d\n" , |
775 | __func__, result); |
776 | priv->write_urb_in_use = 0; |
777 | cypress_set_dead(port); |
778 | } |
779 | |
780 | spin_lock_irqsave(&priv->lock, flags); |
781 | if (priv->cmd_ctrl) |
782 | priv->cmd_ctrl = 0; |
783 | |
784 | /* do not count the line control and size bytes */ |
785 | priv->bytes_out += count; |
786 | spin_unlock_irqrestore(lock: &priv->lock, flags); |
787 | |
788 | usb_serial_port_softint(port); |
789 | } /* cypress_send */ |
790 | |
791 | |
792 | /* returns how much space is available in the soft buffer */ |
793 | static unsigned int cypress_write_room(struct tty_struct *tty) |
794 | { |
795 | struct usb_serial_port *port = tty->driver_data; |
796 | struct cypress_private *priv = usb_get_serial_port_data(port); |
797 | unsigned int room; |
798 | unsigned long flags; |
799 | |
800 | spin_lock_irqsave(&priv->lock, flags); |
801 | room = kfifo_avail(&priv->write_fifo); |
802 | spin_unlock_irqrestore(lock: &priv->lock, flags); |
803 | |
804 | dev_dbg(&port->dev, "%s - returns %u\n" , __func__, room); |
805 | return room; |
806 | } |
807 | |
808 | |
809 | static int cypress_tiocmget(struct tty_struct *tty) |
810 | { |
811 | struct usb_serial_port *port = tty->driver_data; |
812 | struct cypress_private *priv = usb_get_serial_port_data(port); |
813 | __u8 status, control; |
814 | unsigned int result = 0; |
815 | unsigned long flags; |
816 | |
817 | spin_lock_irqsave(&priv->lock, flags); |
818 | control = priv->line_control; |
819 | status = priv->current_status; |
820 | spin_unlock_irqrestore(lock: &priv->lock, flags); |
821 | |
822 | result = ((control & CONTROL_DTR) ? TIOCM_DTR : 0) |
823 | | ((control & CONTROL_RTS) ? TIOCM_RTS : 0) |
824 | | ((status & UART_CTS) ? TIOCM_CTS : 0) |
825 | | ((status & UART_DSR) ? TIOCM_DSR : 0) |
826 | | ((status & UART_RI) ? TIOCM_RI : 0) |
827 | | ((status & UART_CD) ? TIOCM_CD : 0); |
828 | |
829 | dev_dbg(&port->dev, "%s - result = %x\n" , __func__, result); |
830 | |
831 | return result; |
832 | } |
833 | |
834 | |
835 | static int cypress_tiocmset(struct tty_struct *tty, |
836 | unsigned int set, unsigned int clear) |
837 | { |
838 | struct usb_serial_port *port = tty->driver_data; |
839 | struct cypress_private *priv = usb_get_serial_port_data(port); |
840 | unsigned long flags; |
841 | |
842 | spin_lock_irqsave(&priv->lock, flags); |
843 | if (set & TIOCM_RTS) |
844 | priv->line_control |= CONTROL_RTS; |
845 | if (set & TIOCM_DTR) |
846 | priv->line_control |= CONTROL_DTR; |
847 | if (clear & TIOCM_RTS) |
848 | priv->line_control &= ~CONTROL_RTS; |
849 | if (clear & TIOCM_DTR) |
850 | priv->line_control &= ~CONTROL_DTR; |
851 | priv->cmd_ctrl = 1; |
852 | spin_unlock_irqrestore(lock: &priv->lock, flags); |
853 | |
854 | return cypress_write(tty, port, NULL, count: 0); |
855 | } |
856 | |
857 | static void cypress_earthmate_init_termios(struct tty_struct *tty) |
858 | { |
859 | tty_encode_baud_rate(tty, ibaud: 4800, obaud: 4800); |
860 | } |
861 | |
862 | static void cypress_set_termios(struct tty_struct *tty, |
863 | struct usb_serial_port *port, |
864 | const struct ktermios *old_termios) |
865 | { |
866 | struct cypress_private *priv = usb_get_serial_port_data(port); |
867 | struct device *dev = &port->dev; |
868 | int data_bits, stop_bits, parity_type, parity_enable; |
869 | unsigned int cflag; |
870 | unsigned long flags; |
871 | __u8 oldlines; |
872 | int linechange = 0; |
873 | |
874 | /* Unsupported features need clearing */ |
875 | tty->termios.c_cflag &= ~(CMSPAR|CRTSCTS); |
876 | |
877 | cflag = tty->termios.c_cflag; |
878 | |
879 | /* set number of data bits, parity, stop bits */ |
880 | /* when parity is disabled the parity type bit is ignored */ |
881 | |
882 | /* 1 means 2 stop bits, 0 means 1 stop bit */ |
883 | stop_bits = cflag & CSTOPB ? 1 : 0; |
884 | |
885 | if (cflag & PARENB) { |
886 | parity_enable = 1; |
887 | /* 1 means odd parity, 0 means even parity */ |
888 | parity_type = cflag & PARODD ? 1 : 0; |
889 | } else |
890 | parity_enable = parity_type = 0; |
891 | |
892 | data_bits = tty_get_char_size(cflag); |
893 | |
894 | spin_lock_irqsave(&priv->lock, flags); |
895 | oldlines = priv->line_control; |
896 | if ((cflag & CBAUD) == B0) { |
897 | /* drop dtr and rts */ |
898 | dev_dbg(dev, "%s - dropping the lines, baud rate 0bps\n" , __func__); |
899 | priv->line_control &= ~(CONTROL_DTR | CONTROL_RTS); |
900 | } else |
901 | priv->line_control = (CONTROL_DTR | CONTROL_RTS); |
902 | spin_unlock_irqrestore(lock: &priv->lock, flags); |
903 | |
904 | dev_dbg(dev, "%s - sending %d stop_bits, %d parity_enable, %d parity_type, %d data_bits (+5)\n" , |
905 | __func__, stop_bits, parity_enable, parity_type, data_bits); |
906 | |
907 | cypress_serial_control(tty, port, baud_rate: tty_get_baud_rate(tty), |
908 | data_bits, stop_bits, |
909 | parity_enable, parity_type, |
910 | reset: 0, CYPRESS_SET_CONFIG); |
911 | |
912 | /* we perform a CYPRESS_GET_CONFIG so that the current settings are |
913 | * filled into the private structure this should confirm that all is |
914 | * working if it returns what we just set */ |
915 | cypress_serial_control(tty, port, baud_rate: 0, data_bits: 0, stop_bits: 0, parity_enable: 0, parity_type: 0, reset: 0, CYPRESS_GET_CONFIG); |
916 | |
917 | /* Here we can define custom tty settings for devices; the main tty |
918 | * termios flag base comes from empeg.c */ |
919 | |
920 | spin_lock_irqsave(&priv->lock, flags); |
921 | if (priv->chiptype == CT_EARTHMATE && priv->baud_rate == 4800) { |
922 | dev_dbg(dev, "Using custom termios settings for a baud rate of 4800bps.\n" ); |
923 | /* define custom termios settings for NMEA protocol */ |
924 | |
925 | tty->termios.c_iflag /* input modes - */ |
926 | &= ~(IGNBRK /* disable ignore break */ |
927 | | BRKINT /* disable break causes interrupt */ |
928 | | PARMRK /* disable mark parity errors */ |
929 | | ISTRIP /* disable clear high bit of input char */ |
930 | | INLCR /* disable translate NL to CR */ |
931 | | IGNCR /* disable ignore CR */ |
932 | | ICRNL /* disable translate CR to NL */ |
933 | | IXON); /* disable enable XON/XOFF flow control */ |
934 | |
935 | tty->termios.c_oflag /* output modes */ |
936 | &= ~OPOST; /* disable postprocess output char */ |
937 | |
938 | tty->termios.c_lflag /* line discipline modes */ |
939 | &= ~(ECHO /* disable echo input characters */ |
940 | | ECHONL /* disable echo new line */ |
941 | | ICANON /* disable erase, kill, werase, and rprnt |
942 | special characters */ |
943 | | ISIG /* disable interrupt, quit, and suspend |
944 | special characters */ |
945 | | IEXTEN); /* disable non-POSIX special characters */ |
946 | } /* CT_CYPHIDCOM: Application should handle this for device */ |
947 | |
948 | linechange = (priv->line_control != oldlines); |
949 | spin_unlock_irqrestore(lock: &priv->lock, flags); |
950 | |
951 | /* if necessary, set lines */ |
952 | if (linechange) { |
953 | priv->cmd_ctrl = 1; |
954 | cypress_write(tty, port, NULL, count: 0); |
955 | } |
956 | } /* cypress_set_termios */ |
957 | |
958 | |
959 | /* returns amount of data still left in soft buffer */ |
960 | static unsigned int cypress_chars_in_buffer(struct tty_struct *tty) |
961 | { |
962 | struct usb_serial_port *port = tty->driver_data; |
963 | struct cypress_private *priv = usb_get_serial_port_data(port); |
964 | unsigned int chars; |
965 | unsigned long flags; |
966 | |
967 | spin_lock_irqsave(&priv->lock, flags); |
968 | chars = kfifo_len(&priv->write_fifo); |
969 | spin_unlock_irqrestore(lock: &priv->lock, flags); |
970 | |
971 | dev_dbg(&port->dev, "%s - returns %u\n" , __func__, chars); |
972 | return chars; |
973 | } |
974 | |
975 | |
976 | static void cypress_throttle(struct tty_struct *tty) |
977 | { |
978 | struct usb_serial_port *port = tty->driver_data; |
979 | struct cypress_private *priv = usb_get_serial_port_data(port); |
980 | |
981 | spin_lock_irq(lock: &priv->lock); |
982 | priv->rx_flags = THROTTLED; |
983 | spin_unlock_irq(lock: &priv->lock); |
984 | } |
985 | |
986 | |
987 | static void cypress_unthrottle(struct tty_struct *tty) |
988 | { |
989 | struct usb_serial_port *port = tty->driver_data; |
990 | struct cypress_private *priv = usb_get_serial_port_data(port); |
991 | int actually_throttled, result; |
992 | |
993 | spin_lock_irq(lock: &priv->lock); |
994 | actually_throttled = priv->rx_flags & ACTUALLY_THROTTLED; |
995 | priv->rx_flags = 0; |
996 | spin_unlock_irq(lock: &priv->lock); |
997 | |
998 | if (!priv->comm_is_ok) |
999 | return; |
1000 | |
1001 | if (actually_throttled) { |
1002 | result = usb_submit_urb(urb: port->interrupt_in_urb, GFP_KERNEL); |
1003 | if (result) { |
1004 | dev_err(&port->dev, "%s - failed submitting read urb, " |
1005 | "error %d\n" , __func__, result); |
1006 | cypress_set_dead(port); |
1007 | } |
1008 | } |
1009 | } |
1010 | |
1011 | |
1012 | static void cypress_read_int_callback(struct urb *urb) |
1013 | { |
1014 | struct usb_serial_port *port = urb->context; |
1015 | struct cypress_private *priv = usb_get_serial_port_data(port); |
1016 | struct device *dev = &urb->dev->dev; |
1017 | struct tty_struct *tty; |
1018 | unsigned char *data = urb->transfer_buffer; |
1019 | unsigned long flags; |
1020 | char tty_flag = TTY_NORMAL; |
1021 | int bytes = 0; |
1022 | int result; |
1023 | int i = 0; |
1024 | int status = urb->status; |
1025 | |
1026 | switch (status) { |
1027 | case 0: /* success */ |
1028 | break; |
1029 | case -ECONNRESET: |
1030 | case -ENOENT: |
1031 | case -ESHUTDOWN: |
1032 | /* precursor to disconnect so just go away */ |
1033 | return; |
1034 | case -EPIPE: |
1035 | /* Can't call usb_clear_halt while in_interrupt */ |
1036 | fallthrough; |
1037 | default: |
1038 | /* something ugly is going on... */ |
1039 | dev_err(dev, "%s - unexpected nonzero read status received: %d\n" , |
1040 | __func__, status); |
1041 | cypress_set_dead(port); |
1042 | return; |
1043 | } |
1044 | |
1045 | spin_lock_irqsave(&priv->lock, flags); |
1046 | if (priv->rx_flags & THROTTLED) { |
1047 | dev_dbg(dev, "%s - now throttling\n" , __func__); |
1048 | priv->rx_flags |= ACTUALLY_THROTTLED; |
1049 | spin_unlock_irqrestore(lock: &priv->lock, flags); |
1050 | return; |
1051 | } |
1052 | spin_unlock_irqrestore(lock: &priv->lock, flags); |
1053 | |
1054 | tty = tty_port_tty_get(port: &port->port); |
1055 | if (!tty) { |
1056 | dev_dbg(dev, "%s - bad tty pointer - exiting\n" , __func__); |
1057 | return; |
1058 | } |
1059 | |
1060 | spin_lock_irqsave(&priv->lock, flags); |
1061 | result = urb->actual_length; |
1062 | switch (priv->pkt_fmt) { |
1063 | default: |
1064 | case packet_format_1: |
1065 | /* This is for the CY7C64013... */ |
1066 | priv->current_status = data[0] & 0xF8; |
1067 | bytes = data[1] + 2; |
1068 | i = 2; |
1069 | break; |
1070 | case packet_format_2: |
1071 | /* This is for the CY7C63743... */ |
1072 | priv->current_status = data[0] & 0xF8; |
1073 | bytes = (data[0] & 0x07) + 1; |
1074 | i = 1; |
1075 | break; |
1076 | } |
1077 | spin_unlock_irqrestore(lock: &priv->lock, flags); |
1078 | if (result < bytes) { |
1079 | dev_dbg(dev, |
1080 | "%s - wrong packet size - received %d bytes but packet said %d bytes\n" , |
1081 | __func__, result, bytes); |
1082 | goto continue_read; |
1083 | } |
1084 | |
1085 | usb_serial_debug_data(dev: &port->dev, function: __func__, size: urb->actual_length, data); |
1086 | |
1087 | spin_lock_irqsave(&priv->lock, flags); |
1088 | /* check to see if status has changed */ |
1089 | if (priv->current_status != priv->prev_status) { |
1090 | u8 delta = priv->current_status ^ priv->prev_status; |
1091 | |
1092 | if (delta & UART_MSR_MASK) { |
1093 | if (delta & UART_CTS) |
1094 | port->icount.cts++; |
1095 | if (delta & UART_DSR) |
1096 | port->icount.dsr++; |
1097 | if (delta & UART_RI) |
1098 | port->icount.rng++; |
1099 | if (delta & UART_CD) |
1100 | port->icount.dcd++; |
1101 | |
1102 | wake_up_interruptible(&port->port.delta_msr_wait); |
1103 | } |
1104 | |
1105 | priv->prev_status = priv->current_status; |
1106 | } |
1107 | spin_unlock_irqrestore(lock: &priv->lock, flags); |
1108 | |
1109 | /* hangup, as defined in acm.c... this might be a bad place for it |
1110 | * though */ |
1111 | if (tty && !C_CLOCAL(tty) && !(priv->current_status & UART_CD)) { |
1112 | dev_dbg(dev, "%s - calling hangup\n" , __func__); |
1113 | tty_hangup(tty); |
1114 | goto continue_read; |
1115 | } |
1116 | |
1117 | /* There is one error bit... I'm assuming it is a parity error |
1118 | * indicator as the generic firmware will set this bit to 1 if a |
1119 | * parity error occurs. |
1120 | * I can not find reference to any other error events. */ |
1121 | spin_lock_irqsave(&priv->lock, flags); |
1122 | if (priv->current_status & CYP_ERROR) { |
1123 | spin_unlock_irqrestore(lock: &priv->lock, flags); |
1124 | tty_flag = TTY_PARITY; |
1125 | dev_dbg(dev, "%s - Parity Error detected\n" , __func__); |
1126 | } else |
1127 | spin_unlock_irqrestore(lock: &priv->lock, flags); |
1128 | |
1129 | /* process read if there is data other than line status */ |
1130 | if (bytes > i) { |
1131 | tty_insert_flip_string_fixed_flag(port: &port->port, chars: data + i, |
1132 | flag: tty_flag, size: bytes - i); |
1133 | tty_flip_buffer_push(port: &port->port); |
1134 | } |
1135 | |
1136 | spin_lock_irqsave(&priv->lock, flags); |
1137 | /* control and status byte(s) are also counted */ |
1138 | priv->bytes_in += bytes; |
1139 | spin_unlock_irqrestore(lock: &priv->lock, flags); |
1140 | |
1141 | continue_read: |
1142 | tty_kref_put(tty); |
1143 | |
1144 | /* Continue trying to always read */ |
1145 | |
1146 | if (priv->comm_is_ok) { |
1147 | usb_fill_int_urb(urb: port->interrupt_in_urb, dev: port->serial->dev, |
1148 | usb_rcvintpipe(port->serial->dev, |
1149 | port->interrupt_in_endpointAddress), |
1150 | transfer_buffer: port->interrupt_in_urb->transfer_buffer, |
1151 | buffer_length: port->interrupt_in_urb->transfer_buffer_length, |
1152 | complete_fn: cypress_read_int_callback, context: port, |
1153 | interval: priv->read_urb_interval); |
1154 | result = usb_submit_urb(urb: port->interrupt_in_urb, GFP_ATOMIC); |
1155 | if (result && result != -EPERM) { |
1156 | dev_err(dev, "%s - failed resubmitting read urb, error %d\n" , |
1157 | __func__, result); |
1158 | cypress_set_dead(port); |
1159 | } |
1160 | } |
1161 | } /* cypress_read_int_callback */ |
1162 | |
1163 | |
1164 | static void cypress_write_int_callback(struct urb *urb) |
1165 | { |
1166 | struct usb_serial_port *port = urb->context; |
1167 | struct cypress_private *priv = usb_get_serial_port_data(port); |
1168 | struct device *dev = &urb->dev->dev; |
1169 | int status = urb->status; |
1170 | |
1171 | switch (status) { |
1172 | case 0: |
1173 | /* success */ |
1174 | break; |
1175 | case -ECONNRESET: |
1176 | case -ENOENT: |
1177 | case -ESHUTDOWN: |
1178 | /* this urb is terminated, clean up */ |
1179 | dev_dbg(dev, "%s - urb shutting down with status: %d\n" , |
1180 | __func__, status); |
1181 | priv->write_urb_in_use = 0; |
1182 | return; |
1183 | case -EPIPE: |
1184 | /* Cannot call usb_clear_halt while in_interrupt */ |
1185 | fallthrough; |
1186 | default: |
1187 | dev_err(dev, "%s - unexpected nonzero write status received: %d\n" , |
1188 | __func__, status); |
1189 | cypress_set_dead(port); |
1190 | break; |
1191 | } |
1192 | priv->write_urb_in_use = 0; |
1193 | |
1194 | /* send any buffered data */ |
1195 | cypress_send(port); |
1196 | } |
1197 | |
1198 | module_usb_serial_driver(serial_drivers, id_table_combined); |
1199 | |
1200 | MODULE_AUTHOR(DRIVER_AUTHOR); |
1201 | MODULE_DESCRIPTION(DRIVER_DESC); |
1202 | MODULE_LICENSE("GPL" ); |
1203 | |
1204 | module_param(stats, bool, 0644); |
1205 | MODULE_PARM_DESC(stats, "Enable statistics or not" ); |
1206 | module_param(interval, int, 0644); |
1207 | MODULE_PARM_DESC(interval, "Overrides interrupt interval" ); |
1208 | module_param(unstable_bauds, bool, 0644); |
1209 | MODULE_PARM_DESC(unstable_bauds, "Allow unstable baud rates" ); |
1210 | |