Commit | Line | Data |
---|---|---|
1da177e4 LT |
1 | /* |
2 | * MCT (Magic Control Technology Corp.) USB RS232 Converter Driver | |
3 | * | |
4 | * Copyright (C) 2000 Wolfgang Grandegger (wolfgang@ces.ch) | |
5 | * | |
6 | * This program is free software; you can redistribute it and/or modify | |
7 | * it under the terms of the GNU General Public License as published by | |
8 | * the Free Software Foundation; either version 2 of the License, or | |
9 | * (at your option) any later version. | |
10 | * | |
11 | * This program is largely derived from the Belkin USB Serial Adapter Driver | |
12 | * (see belkin_sa.[ch]). All of the information about the device was acquired | |
13 | * by using SniffUSB on Windows98. For technical details see mct_u232.h. | |
14 | * | |
15 | * William G. Greathouse and Greg Kroah-Hartman provided great help on how to | |
16 | * do the reverse engineering and how to write a USB serial device driver. | |
17 | * | |
18 | * TO BE DONE, TO BE CHECKED: | |
19 | * DTR/RTS signal handling may be incomplete or incorrect. I have mainly | |
20 | * implemented what I have seen with SniffUSB or found in belkin_sa.c. | |
21 | * For further TODOs check also belkin_sa.c. | |
1da177e4 LT |
22 | */ |
23 | ||
1da177e4 LT |
24 | #include <linux/kernel.h> |
25 | #include <linux/errno.h> | |
26 | #include <linux/init.h> | |
27 | #include <linux/slab.h> | |
28 | #include <linux/tty.h> | |
29 | #include <linux/tty_driver.h> | |
30 | #include <linux/tty_flip.h> | |
31 | #include <linux/module.h> | |
32 | #include <linux/spinlock.h> | |
e19b2560 | 33 | #include <linux/uaccess.h> |
af2ac1a0 | 34 | #include <asm/unaligned.h> |
1da177e4 | 35 | #include <linux/usb.h> |
a969888c | 36 | #include <linux/usb/serial.h> |
7af75af2 VT |
37 | #include <linux/serial.h> |
38 | #include <linux/ioctl.h> | |
1da177e4 LT |
39 | #include "mct_u232.h" |
40 | ||
41 | /* | |
42 | * Version Information | |
43 | */ | |
45b844df | 44 | #define DRIVER_VERSION "z2.1" /* Linux in-kernel version */ |
1da177e4 LT |
45 | #define DRIVER_AUTHOR "Wolfgang Grandegger <wolfgang@ces.ch>" |
46 | #define DRIVER_DESC "Magic Control Technology USB-RS232 converter driver" | |
47 | ||
90ab5ee9 | 48 | static bool debug; |
1da177e4 LT |
49 | |
50 | /* | |
51 | * Function prototypes | |
52 | */ | |
e19b2560 | 53 | static int mct_u232_startup(struct usb_serial *serial); |
f9c99bb8 | 54 | static void mct_u232_release(struct usb_serial *serial); |
a509a7e4 | 55 | static int mct_u232_open(struct tty_struct *tty, struct usb_serial_port *port); |
335f8514 AC |
56 | static void mct_u232_close(struct usb_serial_port *port); |
57 | static void mct_u232_dtr_rts(struct usb_serial_port *port, int on); | |
e19b2560 AC |
58 | static void mct_u232_read_int_callback(struct urb *urb); |
59 | static void mct_u232_set_termios(struct tty_struct *tty, | |
60 | struct usb_serial_port *port, struct ktermios *old); | |
61 | static void mct_u232_break_ctl(struct tty_struct *tty, int break_state); | |
60b33c13 | 62 | static int mct_u232_tiocmget(struct tty_struct *tty); |
20b9d177 | 63 | static int mct_u232_tiocmset(struct tty_struct *tty, |
e19b2560 | 64 | unsigned int set, unsigned int clear); |
4acfaf82 | 65 | static int mct_u232_ioctl(struct tty_struct *tty, |
7af75af2 VT |
66 | unsigned int cmd, unsigned long arg); |
67 | static int mct_u232_get_icount(struct tty_struct *tty, | |
68 | struct serial_icounter_struct *icount); | |
e19b2560 AC |
69 | static void mct_u232_throttle(struct tty_struct *tty); |
70 | static void mct_u232_unthrottle(struct tty_struct *tty); | |
45b844df DP |
71 | |
72 | ||
1da177e4 LT |
73 | /* |
74 | * All of the device info needed for the MCT USB-RS232 converter. | |
75 | */ | |
68e24113 | 76 | static const struct usb_device_id id_table[] = { |
1da177e4 LT |
77 | { USB_DEVICE(MCT_U232_VID, MCT_U232_PID) }, |
78 | { USB_DEVICE(MCT_U232_VID, MCT_U232_SITECOM_PID) }, | |
79 | { USB_DEVICE(MCT_U232_VID, MCT_U232_DU_H3SP_PID) }, | |
80 | { USB_DEVICE(MCT_U232_BELKIN_F5U109_VID, MCT_U232_BELKIN_F5U109_PID) }, | |
81 | { } /* Terminating entry */ | |
82 | }; | |
68e24113 | 83 | MODULE_DEVICE_TABLE(usb, id_table); |
1da177e4 | 84 | |
ea65370d | 85 | static struct usb_serial_driver mct_u232_device = { |
18fcac35 GKH |
86 | .driver = { |
87 | .owner = THIS_MODULE, | |
269bda1c | 88 | .name = "mct_u232", |
18fcac35 | 89 | }, |
269bda1c | 90 | .description = "MCT U232", |
68e24113 | 91 | .id_table = id_table, |
1da177e4 LT |
92 | .num_ports = 1, |
93 | .open = mct_u232_open, | |
94 | .close = mct_u232_close, | |
335f8514 | 95 | .dtr_rts = mct_u232_dtr_rts, |
45b844df DP |
96 | .throttle = mct_u232_throttle, |
97 | .unthrottle = mct_u232_unthrottle, | |
1da177e4 | 98 | .read_int_callback = mct_u232_read_int_callback, |
1da177e4 LT |
99 | .set_termios = mct_u232_set_termios, |
100 | .break_ctl = mct_u232_break_ctl, | |
101 | .tiocmget = mct_u232_tiocmget, | |
102 | .tiocmset = mct_u232_tiocmset, | |
103 | .attach = mct_u232_startup, | |
f9c99bb8 | 104 | .release = mct_u232_release, |
7af75af2 VT |
105 | .ioctl = mct_u232_ioctl, |
106 | .get_icount = mct_u232_get_icount, | |
1da177e4 LT |
107 | }; |
108 | ||
4d2a7aff AS |
109 | static struct usb_serial_driver * const serial_drivers[] = { |
110 | &mct_u232_device, NULL | |
111 | }; | |
112 | ||
1da177e4 LT |
113 | struct mct_u232_private { |
114 | spinlock_t lock; | |
115 | unsigned int control_state; /* Modem Line Setting (TIOCM) */ | |
116 | unsigned char last_lcr; /* Line Control Register */ | |
117 | unsigned char last_lsr; /* Line Status Register */ | |
118 | unsigned char last_msr; /* Modem Status Register */ | |
45b844df | 119 | unsigned int rx_flags; /* Throttling flags */ |
7af75af2 VT |
120 | struct async_icount icount; |
121 | wait_queue_head_t msr_wait; /* for handling sleeping while waiting | |
122 | for msr change to happen */ | |
1da177e4 LT |
123 | }; |
124 | ||
45b844df DP |
125 | #define THROTTLED 0x01 |
126 | ||
1da177e4 LT |
127 | /* |
128 | * Handle vendor specific USB requests | |
129 | */ | |
130 | ||
131 | #define WDR_TIMEOUT 5000 /* default urb timeout */ | |
132 | ||
133 | /* | |
134 | * Later day 2.6.0-test kernels have new baud rates like B230400 which | |
135 | * we do not know how to support. We ignore them for the moment. | |
1da177e4 | 136 | */ |
e19b2560 AC |
137 | static int mct_u232_calculate_baud_rate(struct usb_serial *serial, |
138 | speed_t value, speed_t *result) | |
1da177e4 | 139 | { |
d0fab0dd AC |
140 | *result = value; |
141 | ||
1da177e4 | 142 | if (le16_to_cpu(serial->dev->descriptor.idProduct) == MCT_U232_SITECOM_PID |
e19b2560 | 143 | || le16_to_cpu(serial->dev->descriptor.idProduct) == MCT_U232_BELKIN_F5U109_PID) { |
1da177e4 | 144 | switch (value) { |
e19b2560 AC |
145 | case 300: |
146 | return 0x01; | |
147 | case 600: | |
148 | return 0x02; /* this one not tested */ | |
149 | case 1200: | |
150 | return 0x03; | |
151 | case 2400: | |
152 | return 0x04; | |
153 | case 4800: | |
154 | return 0x06; | |
155 | case 9600: | |
156 | return 0x08; | |
157 | case 19200: | |
158 | return 0x09; | |
159 | case 38400: | |
160 | return 0x0a; | |
161 | case 57600: | |
162 | return 0x0b; | |
163 | case 115200: | |
164 | return 0x0c; | |
1da177e4 | 165 | default: |
d0fab0dd | 166 | *result = 9600; |
1da177e4 LT |
167 | return 0x08; |
168 | } | |
169 | } else { | |
d0fab0dd AC |
170 | /* FIXME: Can we use any divider - should we do |
171 | divider = 115200/value; | |
172 | real baud = 115200/divider */ | |
1da177e4 | 173 | switch (value) { |
b3aceb2b AM |
174 | case 300: break; |
175 | case 600: break; | |
176 | case 1200: break; | |
177 | case 2400: break; | |
178 | case 4800: break; | |
179 | case 9600: break; | |
180 | case 19200: break; | |
181 | case 38400: break; | |
182 | case 57600: break; | |
183 | case 115200: break; | |
184 | default: | |
b3aceb2b | 185 | value = 9600; |
d0fab0dd | 186 | *result = 9600; |
1da177e4 LT |
187 | } |
188 | return 115200/value; | |
189 | } | |
190 | } | |
191 | ||
95da310e AC |
192 | static int mct_u232_set_baud_rate(struct tty_struct *tty, |
193 | struct usb_serial *serial, struct usb_serial_port *port, speed_t value) | |
1da177e4 | 194 | { |
af2ac1a0 | 195 | unsigned int divisor; |
e19b2560 | 196 | int rc; |
af2ac1a0 | 197 | unsigned char *buf; |
e19b2560 AC |
198 | unsigned char cts_enable_byte = 0; |
199 | speed_t speed; | |
200 | ||
af2ac1a0 PZ |
201 | buf = kmalloc(MCT_U232_MAX_SIZE, GFP_KERNEL); |
202 | if (buf == NULL) | |
203 | return -ENOMEM; | |
e19b2560 | 204 | |
af2ac1a0 PZ |
205 | divisor = mct_u232_calculate_baud_rate(serial, value, &speed); |
206 | put_unaligned_le32(cpu_to_le32(divisor), buf); | |
e19b2560 AC |
207 | rc = usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0), |
208 | MCT_U232_SET_BAUD_RATE_REQUEST, | |
209 | MCT_U232_SET_REQUEST_TYPE, | |
af2ac1a0 | 210 | 0, 0, buf, MCT_U232_SET_BAUD_RATE_SIZE, |
e19b2560 | 211 | WDR_TIMEOUT); |
d0fab0dd | 212 | if (rc < 0) /*FIXME: What value speed results */ |
194343d9 GKH |
213 | dev_err(&port->dev, "Set BAUD RATE %d failed (error = %d)\n", |
214 | value, rc); | |
d0fab0dd | 215 | else |
95da310e | 216 | tty_encode_baud_rate(tty, speed, speed); |
1da177e4 LT |
217 | dbg("set_baud_rate: value: 0x%x, divisor: 0x%x", value, divisor); |
218 | ||
219 | /* Mimic the MCT-supplied Windows driver (version 1.21P.0104), which | |
220 | always sends two extra USB 'device request' messages after the | |
221 | 'baud rate change' message. The actual functionality of the | |
222 | request codes in these messages is not fully understood but these | |
223 | particular codes are never seen in any operation besides a baud | |
45b844df DP |
224 | rate change. Both of these messages send a single byte of data. |
225 | In the first message, the value of this byte is always zero. | |
226 | ||
227 | The second message has been determined experimentally to control | |
228 | whether data will be transmitted to a device which is not asserting | |
229 | the 'CTS' signal. If the second message's data byte is zero, data | |
230 | will be transmitted even if 'CTS' is not asserted (i.e. no hardware | |
e19b2560 AC |
231 | flow control). if the second message's data byte is nonzero (a |
232 | value of 1 is used by this driver), data will not be transmitted to | |
233 | a device which is not asserting 'CTS'. | |
45b844df | 234 | */ |
1da177e4 | 235 | |
af2ac1a0 | 236 | buf[0] = 0; |
1da177e4 | 237 | rc = usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0), |
e19b2560 AC |
238 | MCT_U232_SET_UNKNOWN1_REQUEST, |
239 | MCT_U232_SET_REQUEST_TYPE, | |
af2ac1a0 | 240 | 0, 0, buf, MCT_U232_SET_UNKNOWN1_SIZE, |
e19b2560 | 241 | WDR_TIMEOUT); |
1da177e4 | 242 | if (rc < 0) |
194343d9 GKH |
243 | dev_err(&port->dev, "Sending USB device request code %d " |
244 | "failed (error = %d)\n", MCT_U232_SET_UNKNOWN1_REQUEST, | |
245 | rc); | |
1da177e4 | 246 | |
e19b2560 | 247 | if (port && C_CRTSCTS(tty)) |
45b844df | 248 | cts_enable_byte = 1; |
45b844df | 249 | |
e19b2560 AC |
250 | dbg("set_baud_rate: send second control message, data = %02X", |
251 | cts_enable_byte); | |
af2ac1a0 | 252 | buf[0] = cts_enable_byte; |
1da177e4 | 253 | rc = usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0), |
e19b2560 AC |
254 | MCT_U232_SET_CTS_REQUEST, |
255 | MCT_U232_SET_REQUEST_TYPE, | |
af2ac1a0 | 256 | 0, 0, buf, MCT_U232_SET_CTS_SIZE, |
e19b2560 | 257 | WDR_TIMEOUT); |
1da177e4 | 258 | if (rc < 0) |
194343d9 GKH |
259 | dev_err(&port->dev, "Sending USB device request code %d " |
260 | "failed (error = %d)\n", MCT_U232_SET_CTS_REQUEST, rc); | |
1da177e4 | 261 | |
af2ac1a0 | 262 | kfree(buf); |
e19b2560 | 263 | return rc; |
1da177e4 LT |
264 | } /* mct_u232_set_baud_rate */ |
265 | ||
266 | static int mct_u232_set_line_ctrl(struct usb_serial *serial, unsigned char lcr) | |
267 | { | |
e19b2560 | 268 | int rc; |
af2ac1a0 PZ |
269 | unsigned char *buf; |
270 | ||
271 | buf = kmalloc(MCT_U232_MAX_SIZE, GFP_KERNEL); | |
272 | if (buf == NULL) | |
273 | return -ENOMEM; | |
274 | ||
275 | buf[0] = lcr; | |
e19b2560 AC |
276 | rc = usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0), |
277 | MCT_U232_SET_LINE_CTRL_REQUEST, | |
278 | MCT_U232_SET_REQUEST_TYPE, | |
af2ac1a0 | 279 | 0, 0, buf, MCT_U232_SET_LINE_CTRL_SIZE, |
e19b2560 | 280 | WDR_TIMEOUT); |
1da177e4 | 281 | if (rc < 0) |
194343d9 GKH |
282 | dev_err(&serial->dev->dev, |
283 | "Set LINE CTRL 0x%x failed (error = %d)\n", lcr, rc); | |
1da177e4 | 284 | dbg("set_line_ctrl: 0x%x", lcr); |
af2ac1a0 | 285 | kfree(buf); |
e19b2560 | 286 | return rc; |
1da177e4 LT |
287 | } /* mct_u232_set_line_ctrl */ |
288 | ||
289 | static int mct_u232_set_modem_ctrl(struct usb_serial *serial, | |
290 | unsigned int control_state) | |
291 | { | |
e19b2560 | 292 | int rc; |
af2ac1a0 PZ |
293 | unsigned char mcr; |
294 | unsigned char *buf; | |
295 | ||
296 | buf = kmalloc(MCT_U232_MAX_SIZE, GFP_KERNEL); | |
297 | if (buf == NULL) | |
298 | return -ENOMEM; | |
1da177e4 | 299 | |
af2ac1a0 | 300 | mcr = MCT_U232_MCR_NONE; |
1da177e4 LT |
301 | if (control_state & TIOCM_DTR) |
302 | mcr |= MCT_U232_MCR_DTR; | |
303 | if (control_state & TIOCM_RTS) | |
304 | mcr |= MCT_U232_MCR_RTS; | |
305 | ||
af2ac1a0 | 306 | buf[0] = mcr; |
e19b2560 AC |
307 | rc = usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0), |
308 | MCT_U232_SET_MODEM_CTRL_REQUEST, | |
309 | MCT_U232_SET_REQUEST_TYPE, | |
af2ac1a0 | 310 | 0, 0, buf, MCT_U232_SET_MODEM_CTRL_SIZE, |
e19b2560 | 311 | WDR_TIMEOUT); |
1aa3c63c AC |
312 | kfree(buf); |
313 | ||
1da177e4 LT |
314 | dbg("set_modem_ctrl: state=0x%x ==> mcr=0x%x", control_state, mcr); |
315 | ||
1aa3c63c AC |
316 | if (rc < 0) { |
317 | dev_err(&serial->dev->dev, | |
318 | "Set MODEM CTRL 0x%x failed (error = %d)\n", mcr, rc); | |
319 | return rc; | |
320 | } | |
321 | return 0; | |
1da177e4 LT |
322 | } /* mct_u232_set_modem_ctrl */ |
323 | ||
e19b2560 AC |
324 | static int mct_u232_get_modem_stat(struct usb_serial *serial, |
325 | unsigned char *msr) | |
1da177e4 | 326 | { |
e19b2560 | 327 | int rc; |
af2ac1a0 PZ |
328 | unsigned char *buf; |
329 | ||
330 | buf = kmalloc(MCT_U232_MAX_SIZE, GFP_KERNEL); | |
331 | if (buf == NULL) { | |
332 | *msr = 0; | |
333 | return -ENOMEM; | |
334 | } | |
e19b2560 AC |
335 | rc = usb_control_msg(serial->dev, usb_rcvctrlpipe(serial->dev, 0), |
336 | MCT_U232_GET_MODEM_STAT_REQUEST, | |
337 | MCT_U232_GET_REQUEST_TYPE, | |
af2ac1a0 | 338 | 0, 0, buf, MCT_U232_GET_MODEM_STAT_SIZE, |
e19b2560 | 339 | WDR_TIMEOUT); |
1da177e4 | 340 | if (rc < 0) { |
194343d9 GKH |
341 | dev_err(&serial->dev->dev, |
342 | "Get MODEM STATus failed (error = %d)\n", rc); | |
1da177e4 | 343 | *msr = 0; |
af2ac1a0 PZ |
344 | } else { |
345 | *msr = buf[0]; | |
1da177e4 LT |
346 | } |
347 | dbg("get_modem_stat: 0x%x", *msr); | |
af2ac1a0 | 348 | kfree(buf); |
e19b2560 | 349 | return rc; |
1da177e4 LT |
350 | } /* mct_u232_get_modem_stat */ |
351 | ||
7af75af2 VT |
352 | static void mct_u232_msr_to_icount(struct async_icount *icount, |
353 | unsigned char msr) | |
354 | { | |
355 | /* Translate Control Line states */ | |
356 | if (msr & MCT_U232_MSR_DDSR) | |
357 | icount->dsr++; | |
358 | if (msr & MCT_U232_MSR_DCTS) | |
359 | icount->cts++; | |
360 | if (msr & MCT_U232_MSR_DRI) | |
361 | icount->rng++; | |
362 | if (msr & MCT_U232_MSR_DCD) | |
363 | icount->dcd++; | |
364 | } /* mct_u232_msr_to_icount */ | |
365 | ||
e19b2560 AC |
366 | static void mct_u232_msr_to_state(unsigned int *control_state, |
367 | unsigned char msr) | |
1da177e4 | 368 | { |
e19b2560 | 369 | /* Translate Control Line states */ |
1da177e4 LT |
370 | if (msr & MCT_U232_MSR_DSR) |
371 | *control_state |= TIOCM_DSR; | |
372 | else | |
373 | *control_state &= ~TIOCM_DSR; | |
374 | if (msr & MCT_U232_MSR_CTS) | |
375 | *control_state |= TIOCM_CTS; | |
376 | else | |
377 | *control_state &= ~TIOCM_CTS; | |
378 | if (msr & MCT_U232_MSR_RI) | |
379 | *control_state |= TIOCM_RI; | |
380 | else | |
381 | *control_state &= ~TIOCM_RI; | |
382 | if (msr & MCT_U232_MSR_CD) | |
383 | *control_state |= TIOCM_CD; | |
384 | else | |
385 | *control_state &= ~TIOCM_CD; | |
e19b2560 | 386 | dbg("msr_to_state: msr=0x%x ==> state=0x%x", msr, *control_state); |
1da177e4 LT |
387 | } /* mct_u232_msr_to_state */ |
388 | ||
389 | /* | |
390 | * Driver's tty interface functions | |
391 | */ | |
392 | ||
e19b2560 | 393 | static int mct_u232_startup(struct usb_serial *serial) |
1da177e4 LT |
394 | { |
395 | struct mct_u232_private *priv; | |
396 | struct usb_serial_port *port, *rport; | |
397 | ||
80b6ca48 | 398 | priv = kzalloc(sizeof(struct mct_u232_private), GFP_KERNEL); |
1da177e4 LT |
399 | if (!priv) |
400 | return -ENOMEM; | |
1da177e4 | 401 | spin_lock_init(&priv->lock); |
7af75af2 | 402 | init_waitqueue_head(&priv->msr_wait); |
1da177e4 LT |
403 | usb_set_serial_port_data(serial->port[0], priv); |
404 | ||
405 | init_waitqueue_head(&serial->port[0]->write_wait); | |
406 | ||
407 | /* Puh, that's dirty */ | |
408 | port = serial->port[0]; | |
409 | rport = serial->port[1]; | |
73135bb9 MK |
410 | /* No unlinking, it wasn't submitted yet. */ |
411 | usb_free_urb(port->read_urb); | |
1da177e4 LT |
412 | port->read_urb = rport->interrupt_in_urb; |
413 | rport->interrupt_in_urb = NULL; | |
414 | port->read_urb->context = port; | |
415 | ||
e19b2560 | 416 | return 0; |
1da177e4 LT |
417 | } /* mct_u232_startup */ |
418 | ||
419 | ||
f9c99bb8 | 420 | static void mct_u232_release(struct usb_serial *serial) |
1da177e4 LT |
421 | { |
422 | struct mct_u232_private *priv; | |
423 | int i; | |
e19b2560 | 424 | |
e19b2560 | 425 | for (i = 0; i < serial->num_ports; ++i) { |
1da177e4 LT |
426 | /* My special items, the standard routines free my urbs */ |
427 | priv = usb_get_serial_port_data(serial->port[i]); | |
f9c99bb8 | 428 | kfree(priv); |
1da177e4 | 429 | } |
f9c99bb8 | 430 | } /* mct_u232_release */ |
1da177e4 | 431 | |
a509a7e4 | 432 | static int mct_u232_open(struct tty_struct *tty, struct usb_serial_port *port) |
1da177e4 LT |
433 | { |
434 | struct usb_serial *serial = port->serial; | |
435 | struct mct_u232_private *priv = usb_get_serial_port_data(port); | |
436 | int retval = 0; | |
437 | unsigned int control_state; | |
438 | unsigned long flags; | |
439 | unsigned char last_lcr; | |
440 | unsigned char last_msr; | |
441 | ||
1da177e4 LT |
442 | /* Compensate for a hardware bug: although the Sitecom U232-P25 |
443 | * device reports a maximum output packet size of 32 bytes, | |
444 | * it seems to be able to accept only 16 bytes (and that's what | |
445 | * SniffUSB says too...) | |
446 | */ | |
e19b2560 AC |
447 | if (le16_to_cpu(serial->dev->descriptor.idProduct) |
448 | == MCT_U232_SITECOM_PID) | |
1da177e4 LT |
449 | port->bulk_out_size = 16; |
450 | ||
e19b2560 | 451 | /* Do a defined restart: the normal serial device seems to |
1da177e4 LT |
452 | * always turn on DTR and RTS here, so do the same. I'm not |
453 | * sure if this is really necessary. But it should not harm | |
454 | * either. | |
455 | */ | |
456 | spin_lock_irqsave(&priv->lock, flags); | |
95da310e | 457 | if (tty && (tty->termios->c_cflag & CBAUD)) |
1da177e4 LT |
458 | priv->control_state = TIOCM_DTR | TIOCM_RTS; |
459 | else | |
460 | priv->control_state = 0; | |
e19b2560 AC |
461 | |
462 | priv->last_lcr = (MCT_U232_DATA_BITS_8 | | |
1da177e4 LT |
463 | MCT_U232_PARITY_NONE | |
464 | MCT_U232_STOP_BITS_1); | |
465 | control_state = priv->control_state; | |
466 | last_lcr = priv->last_lcr; | |
467 | spin_unlock_irqrestore(&priv->lock, flags); | |
468 | mct_u232_set_modem_ctrl(serial, control_state); | |
469 | mct_u232_set_line_ctrl(serial, last_lcr); | |
470 | ||
471 | /* Read modem status and update control state */ | |
472 | mct_u232_get_modem_stat(serial, &last_msr); | |
473 | spin_lock_irqsave(&priv->lock, flags); | |
474 | priv->last_msr = last_msr; | |
475 | mct_u232_msr_to_state(&priv->control_state, priv->last_msr); | |
476 | spin_unlock_irqrestore(&priv->lock, flags); | |
477 | ||
1da177e4 LT |
478 | retval = usb_submit_urb(port->read_urb, GFP_KERNEL); |
479 | if (retval) { | |
194343d9 GKH |
480 | dev_err(&port->dev, |
481 | "usb_submit_urb(read bulk) failed pipe 0x%x err %d\n", | |
482 | port->read_urb->pipe, retval); | |
2f007de2 | 483 | goto error; |
1da177e4 LT |
484 | } |
485 | ||
1da177e4 | 486 | retval = usb_submit_urb(port->interrupt_in_urb, GFP_KERNEL); |
2f007de2 ON |
487 | if (retval) { |
488 | usb_kill_urb(port->read_urb); | |
194343d9 GKH |
489 | dev_err(&port->dev, |
490 | "usb_submit_urb(read int) failed pipe 0x%x err %d", | |
491 | port->interrupt_in_urb->pipe, retval); | |
2f007de2 ON |
492 | goto error; |
493 | } | |
1da177e4 | 494 | return 0; |
2f007de2 ON |
495 | |
496 | error: | |
497 | return retval; | |
1da177e4 LT |
498 | } /* mct_u232_open */ |
499 | ||
335f8514 | 500 | static void mct_u232_dtr_rts(struct usb_serial_port *port, int on) |
1da177e4 | 501 | { |
45b844df DP |
502 | unsigned int control_state; |
503 | struct mct_u232_private *priv = usb_get_serial_port_data(port); | |
1da177e4 | 504 | |
335f8514 AC |
505 | mutex_lock(&port->serial->disc_mutex); |
506 | if (!port->serial->disconnected) { | |
507 | /* drop DTR and RTS */ | |
508 | spin_lock_irq(&priv->lock); | |
509 | if (on) | |
510 | priv->control_state |= TIOCM_DTR | TIOCM_RTS; | |
511 | else | |
e33fe4d8 | 512 | priv->control_state &= ~(TIOCM_DTR | TIOCM_RTS); |
335f8514 AC |
513 | control_state = priv->control_state; |
514 | spin_unlock_irq(&priv->lock); | |
515 | mct_u232_set_modem_ctrl(port->serial, control_state); | |
45b844df | 516 | } |
335f8514 AC |
517 | mutex_unlock(&port->serial->disc_mutex); |
518 | } | |
45b844df | 519 | |
335f8514 AC |
520 | static void mct_u232_close(struct usb_serial_port *port) |
521 | { | |
92ca0dc5 JH |
522 | if (port->serial->dev) { |
523 | /* shutdown our urbs */ | |
524 | usb_kill_urb(port->write_urb); | |
525 | usb_kill_urb(port->read_urb); | |
1da177e4 | 526 | usb_kill_urb(port->interrupt_in_urb); |
92ca0dc5 | 527 | } |
1da177e4 LT |
528 | } /* mct_u232_close */ |
529 | ||
530 | ||
e19b2560 | 531 | static void mct_u232_read_int_callback(struct urb *urb) |
1da177e4 | 532 | { |
cdc97792 | 533 | struct usb_serial_port *port = urb->context; |
1da177e4 LT |
534 | struct mct_u232_private *priv = usb_get_serial_port_data(port); |
535 | struct usb_serial *serial = port->serial; | |
536 | struct tty_struct *tty; | |
537 | unsigned char *data = urb->transfer_buffer; | |
e96da398 GKH |
538 | int retval; |
539 | int status = urb->status; | |
1da177e4 LT |
540 | unsigned long flags; |
541 | ||
e96da398 | 542 | switch (status) { |
1da177e4 LT |
543 | case 0: |
544 | /* success */ | |
545 | break; | |
546 | case -ECONNRESET: | |
547 | case -ENOENT: | |
548 | case -ESHUTDOWN: | |
549 | /* this urb is terminated, clean up */ | |
e96da398 | 550 | dbg("%s - urb shutting down with status: %d", |
441b62c1 | 551 | __func__, status); |
1da177e4 LT |
552 | return; |
553 | default: | |
e96da398 | 554 | dbg("%s - nonzero urb status received: %d", |
441b62c1 | 555 | __func__, status); |
1da177e4 LT |
556 | goto exit; |
557 | } | |
558 | ||
559 | if (!serial) { | |
441b62c1 | 560 | dbg("%s - bad serial pointer, exiting", __func__); |
1da177e4 LT |
561 | return; |
562 | } | |
563 | ||
e19b2560 AC |
564 | usb_serial_debug_data(debug, &port->dev, __func__, |
565 | urb->actual_length, data); | |
1da177e4 LT |
566 | |
567 | /* | |
568 | * Work-a-round: handle the 'usual' bulk-in pipe here | |
569 | */ | |
570 | if (urb->transfer_buffer_length > 2) { | |
1da177e4 | 571 | if (urb->actual_length) { |
054f2346 JS |
572 | tty = tty_port_tty_get(&port->port); |
573 | if (tty) { | |
574 | tty_insert_flip_string(tty, data, | |
575 | urb->actual_length); | |
576 | tty_flip_buffer_push(tty); | |
577 | } | |
4a90f09b | 578 | tty_kref_put(tty); |
1da177e4 LT |
579 | } |
580 | goto exit; | |
581 | } | |
e19b2560 | 582 | |
1da177e4 LT |
583 | /* |
584 | * The interrupt-in pipe signals exceptional conditions (modem line | |
585 | * signal changes and errors). data[0] holds MSR, data[1] holds LSR. | |
586 | */ | |
587 | spin_lock_irqsave(&priv->lock, flags); | |
588 | priv->last_msr = data[MCT_U232_MSR_INDEX]; | |
e19b2560 | 589 | |
1da177e4 LT |
590 | /* Record Control Line states */ |
591 | mct_u232_msr_to_state(&priv->control_state, priv->last_msr); | |
592 | ||
7af75af2 VT |
593 | mct_u232_msr_to_icount(&priv->icount, priv->last_msr); |
594 | ||
1da177e4 | 595 | #if 0 |
e19b2560 | 596 | /* Not yet handled. See belkin_sa.c for further information */ |
1da177e4 LT |
597 | /* Now to report any errors */ |
598 | priv->last_lsr = data[MCT_U232_LSR_INDEX]; | |
599 | /* | |
600 | * fill in the flip buffer here, but I do not know the relation | |
601 | * to the current/next receive buffer or characters. I need | |
602 | * to look in to this before committing any code. | |
603 | */ | |
604 | if (priv->last_lsr & MCT_U232_LSR_ERR) { | |
4a90f09b | 605 | tty = tty_port_tty_get(&port->port); |
1da177e4 LT |
606 | /* Overrun Error */ |
607 | if (priv->last_lsr & MCT_U232_LSR_OE) { | |
608 | } | |
609 | /* Parity Error */ | |
610 | if (priv->last_lsr & MCT_U232_LSR_PE) { | |
611 | } | |
612 | /* Framing Error */ | |
613 | if (priv->last_lsr & MCT_U232_LSR_FE) { | |
614 | } | |
615 | /* Break Indicator */ | |
616 | if (priv->last_lsr & MCT_U232_LSR_BI) { | |
617 | } | |
4a90f09b | 618 | tty_kref_put(tty); |
1da177e4 LT |
619 | } |
620 | #endif | |
7af75af2 | 621 | wake_up_interruptible(&priv->msr_wait); |
1da177e4 LT |
622 | spin_unlock_irqrestore(&priv->lock, flags); |
623 | exit: | |
e19b2560 | 624 | retval = usb_submit_urb(urb, GFP_ATOMIC); |
e96da398 | 625 | if (retval) |
194343d9 GKH |
626 | dev_err(&port->dev, |
627 | "%s - usb_submit_urb failed with result %d\n", | |
628 | __func__, retval); | |
1da177e4 LT |
629 | } /* mct_u232_read_int_callback */ |
630 | ||
e19b2560 AC |
631 | static void mct_u232_set_termios(struct tty_struct *tty, |
632 | struct usb_serial_port *port, | |
633 | struct ktermios *old_termios) | |
1da177e4 LT |
634 | { |
635 | struct usb_serial *serial = port->serial; | |
636 | struct mct_u232_private *priv = usb_get_serial_port_data(port); | |
95da310e | 637 | struct ktermios *termios = tty->termios; |
d0fab0dd | 638 | unsigned int cflag = termios->c_cflag; |
1da177e4 LT |
639 | unsigned int old_cflag = old_termios->c_cflag; |
640 | unsigned long flags; | |
45b844df | 641 | unsigned int control_state; |
1da177e4 LT |
642 | unsigned char last_lcr; |
643 | ||
644 | /* get a local copy of the current port settings */ | |
645 | spin_lock_irqsave(&priv->lock, flags); | |
646 | control_state = priv->control_state; | |
647 | spin_unlock_irqrestore(&priv->lock, flags); | |
648 | last_lcr = 0; | |
649 | ||
650 | /* | |
651 | * Update baud rate. | |
652 | * Do not attempt to cache old rates and skip settings, | |
653 | * disconnects screw such tricks up completely. | |
654 | * Premature optimization is the root of all evil. | |
655 | */ | |
656 | ||
e19b2560 | 657 | /* reassert DTR and RTS on transition from B0 */ |
1da177e4 | 658 | if ((old_cflag & CBAUD) == B0) { |
441b62c1 | 659 | dbg("%s: baud was B0", __func__); |
45b844df | 660 | control_state |= TIOCM_DTR | TIOCM_RTS; |
1da177e4 LT |
661 | mct_u232_set_modem_ctrl(serial, control_state); |
662 | } | |
663 | ||
95da310e | 664 | mct_u232_set_baud_rate(tty, serial, port, tty_get_baud_rate(tty)); |
1da177e4 | 665 | |
e19b2560 | 666 | if ((cflag & CBAUD) == B0) { |
441b62c1 | 667 | dbg("%s: baud is B0", __func__); |
1da177e4 LT |
668 | /* Drop RTS and DTR */ |
669 | control_state &= ~(TIOCM_DTR | TIOCM_RTS); | |
e19b2560 | 670 | mct_u232_set_modem_ctrl(serial, control_state); |
1da177e4 LT |
671 | } |
672 | ||
673 | /* | |
674 | * Update line control register (LCR) | |
675 | */ | |
676 | ||
677 | /* set the parity */ | |
678 | if (cflag & PARENB) | |
679 | last_lcr |= (cflag & PARODD) ? | |
680 | MCT_U232_PARITY_ODD : MCT_U232_PARITY_EVEN; | |
681 | else | |
682 | last_lcr |= MCT_U232_PARITY_NONE; | |
683 | ||
684 | /* set the number of data bits */ | |
685 | switch (cflag & CSIZE) { | |
686 | case CS5: | |
687 | last_lcr |= MCT_U232_DATA_BITS_5; break; | |
688 | case CS6: | |
689 | last_lcr |= MCT_U232_DATA_BITS_6; break; | |
690 | case CS7: | |
691 | last_lcr |= MCT_U232_DATA_BITS_7; break; | |
692 | case CS8: | |
693 | last_lcr |= MCT_U232_DATA_BITS_8; break; | |
694 | default: | |
194343d9 GKH |
695 | dev_err(&port->dev, |
696 | "CSIZE was not CS5-CS8, using default of 8\n"); | |
1da177e4 LT |
697 | last_lcr |= MCT_U232_DATA_BITS_8; |
698 | break; | |
699 | } | |
700 | ||
d0fab0dd AC |
701 | termios->c_cflag &= ~CMSPAR; |
702 | ||
1da177e4 LT |
703 | /* set the number of stop bits */ |
704 | last_lcr |= (cflag & CSTOPB) ? | |
705 | MCT_U232_STOP_BITS_2 : MCT_U232_STOP_BITS_1; | |
706 | ||
707 | mct_u232_set_line_ctrl(serial, last_lcr); | |
708 | ||
1da177e4 LT |
709 | /* save off the modified port settings */ |
710 | spin_lock_irqsave(&priv->lock, flags); | |
711 | priv->control_state = control_state; | |
712 | priv->last_lcr = last_lcr; | |
713 | spin_unlock_irqrestore(&priv->lock, flags); | |
714 | } /* mct_u232_set_termios */ | |
715 | ||
95da310e | 716 | static void mct_u232_break_ctl(struct tty_struct *tty, int break_state) |
1da177e4 | 717 | { |
95da310e | 718 | struct usb_serial_port *port = tty->driver_data; |
1da177e4 LT |
719 | struct usb_serial *serial = port->serial; |
720 | struct mct_u232_private *priv = usb_get_serial_port_data(port); | |
721 | unsigned char lcr; | |
722 | unsigned long flags; | |
723 | ||
1da177e4 LT |
724 | spin_lock_irqsave(&priv->lock, flags); |
725 | lcr = priv->last_lcr; | |
1da177e4 LT |
726 | |
727 | if (break_state) | |
728 | lcr |= MCT_U232_SET_BREAK; | |
6b447f04 | 729 | spin_unlock_irqrestore(&priv->lock, flags); |
1da177e4 LT |
730 | |
731 | mct_u232_set_line_ctrl(serial, lcr); | |
732 | } /* mct_u232_break_ctl */ | |
733 | ||
734 | ||
60b33c13 | 735 | static int mct_u232_tiocmget(struct tty_struct *tty) |
1da177e4 | 736 | { |
95da310e | 737 | struct usb_serial_port *port = tty->driver_data; |
1da177e4 LT |
738 | struct mct_u232_private *priv = usb_get_serial_port_data(port); |
739 | unsigned int control_state; | |
740 | unsigned long flags; | |
e19b2560 | 741 | |
1da177e4 LT |
742 | spin_lock_irqsave(&priv->lock, flags); |
743 | control_state = priv->control_state; | |
744 | spin_unlock_irqrestore(&priv->lock, flags); | |
745 | ||
746 | return control_state; | |
747 | } | |
748 | ||
20b9d177 | 749 | static int mct_u232_tiocmset(struct tty_struct *tty, |
1da177e4 LT |
750 | unsigned int set, unsigned int clear) |
751 | { | |
95da310e | 752 | struct usb_serial_port *port = tty->driver_data; |
1da177e4 LT |
753 | struct usb_serial *serial = port->serial; |
754 | struct mct_u232_private *priv = usb_get_serial_port_data(port); | |
755 | unsigned int control_state; | |
756 | unsigned long flags; | |
e19b2560 | 757 | |
1da177e4 LT |
758 | spin_lock_irqsave(&priv->lock, flags); |
759 | control_state = priv->control_state; | |
760 | ||
761 | if (set & TIOCM_RTS) | |
762 | control_state |= TIOCM_RTS; | |
763 | if (set & TIOCM_DTR) | |
764 | control_state |= TIOCM_DTR; | |
765 | if (clear & TIOCM_RTS) | |
766 | control_state &= ~TIOCM_RTS; | |
767 | if (clear & TIOCM_DTR) | |
768 | control_state &= ~TIOCM_DTR; | |
769 | ||
770 | priv->control_state = control_state; | |
771 | spin_unlock_irqrestore(&priv->lock, flags); | |
772 | return mct_u232_set_modem_ctrl(serial, control_state); | |
773 | } | |
774 | ||
95da310e | 775 | static void mct_u232_throttle(struct tty_struct *tty) |
45b844df | 776 | { |
95da310e | 777 | struct usb_serial_port *port = tty->driver_data; |
45b844df | 778 | struct mct_u232_private *priv = usb_get_serial_port_data(port); |
45b844df | 779 | unsigned int control_state; |
45b844df | 780 | |
63832515 | 781 | spin_lock_irq(&priv->lock); |
45b844df DP |
782 | priv->rx_flags |= THROTTLED; |
783 | if (C_CRTSCTS(tty)) { | |
95da310e AC |
784 | priv->control_state &= ~TIOCM_RTS; |
785 | control_state = priv->control_state; | |
63832515 | 786 | spin_unlock_irq(&priv->lock); |
95da310e | 787 | (void) mct_u232_set_modem_ctrl(port->serial, control_state); |
45b844df | 788 | } else { |
63832515 | 789 | spin_unlock_irq(&priv->lock); |
45b844df DP |
790 | } |
791 | } | |
792 | ||
95da310e | 793 | static void mct_u232_unthrottle(struct tty_struct *tty) |
45b844df | 794 | { |
95da310e | 795 | struct usb_serial_port *port = tty->driver_data; |
45b844df | 796 | struct mct_u232_private *priv = usb_get_serial_port_data(port); |
45b844df | 797 | unsigned int control_state; |
45b844df | 798 | |
63832515 | 799 | spin_lock_irq(&priv->lock); |
45b844df | 800 | if ((priv->rx_flags & THROTTLED) && C_CRTSCTS(tty)) { |
95da310e AC |
801 | priv->rx_flags &= ~THROTTLED; |
802 | priv->control_state |= TIOCM_RTS; | |
803 | control_state = priv->control_state; | |
63832515 | 804 | spin_unlock_irq(&priv->lock); |
95da310e | 805 | (void) mct_u232_set_modem_ctrl(port->serial, control_state); |
45b844df | 806 | } else { |
63832515 | 807 | spin_unlock_irq(&priv->lock); |
45b844df DP |
808 | } |
809 | } | |
1da177e4 | 810 | |
4acfaf82 | 811 | static int mct_u232_ioctl(struct tty_struct *tty, |
7af75af2 VT |
812 | unsigned int cmd, unsigned long arg) |
813 | { | |
814 | DEFINE_WAIT(wait); | |
815 | struct usb_serial_port *port = tty->driver_data; | |
816 | struct mct_u232_private *mct_u232_port = usb_get_serial_port_data(port); | |
817 | struct async_icount cnow, cprev; | |
818 | unsigned long flags; | |
819 | ||
820 | dbg("%s - port %d, cmd = 0x%x", __func__, port->number, cmd); | |
821 | ||
822 | switch (cmd) { | |
823 | ||
824 | case TIOCMIWAIT: | |
825 | ||
826 | dbg("%s (%d) TIOCMIWAIT", __func__, port->number); | |
827 | ||
828 | spin_lock_irqsave(&mct_u232_port->lock, flags); | |
829 | cprev = mct_u232_port->icount; | |
830 | spin_unlock_irqrestore(&mct_u232_port->lock, flags); | |
831 | for ( ; ; ) { | |
832 | prepare_to_wait(&mct_u232_port->msr_wait, | |
833 | &wait, TASK_INTERRUPTIBLE); | |
834 | schedule(); | |
835 | finish_wait(&mct_u232_port->msr_wait, &wait); | |
836 | /* see if a signal did it */ | |
837 | if (signal_pending(current)) | |
838 | return -ERESTARTSYS; | |
839 | spin_lock_irqsave(&mct_u232_port->lock, flags); | |
840 | cnow = mct_u232_port->icount; | |
841 | spin_unlock_irqrestore(&mct_u232_port->lock, flags); | |
842 | if (cnow.rng == cprev.rng && cnow.dsr == cprev.dsr && | |
843 | cnow.dcd == cprev.dcd && cnow.cts == cprev.cts) | |
844 | return -EIO; /* no change => error */ | |
845 | if (((arg & TIOCM_RNG) && (cnow.rng != cprev.rng)) || | |
846 | ((arg & TIOCM_DSR) && (cnow.dsr != cprev.dsr)) || | |
847 | ((arg & TIOCM_CD) && (cnow.dcd != cprev.dcd)) || | |
848 | ((arg & TIOCM_CTS) && (cnow.cts != cprev.cts))) { | |
849 | return 0; | |
850 | } | |
851 | cprev = cnow; | |
852 | } | |
853 | ||
854 | } | |
855 | return -ENOIOCTLCMD; | |
856 | } | |
857 | ||
858 | static int mct_u232_get_icount(struct tty_struct *tty, | |
859 | struct serial_icounter_struct *icount) | |
860 | { | |
861 | struct usb_serial_port *port = tty->driver_data; | |
862 | struct mct_u232_private *mct_u232_port = usb_get_serial_port_data(port); | |
863 | struct async_icount *ic = &mct_u232_port->icount; | |
864 | unsigned long flags; | |
865 | ||
866 | spin_lock_irqsave(&mct_u232_port->lock, flags); | |
867 | ||
868 | icount->cts = ic->cts; | |
869 | icount->dsr = ic->dsr; | |
870 | icount->rng = ic->rng; | |
871 | icount->dcd = ic->dcd; | |
872 | icount->rx = ic->rx; | |
873 | icount->tx = ic->tx; | |
874 | icount->frame = ic->frame; | |
875 | icount->overrun = ic->overrun; | |
876 | icount->parity = ic->parity; | |
877 | icount->brk = ic->brk; | |
878 | icount->buf_overrun = ic->buf_overrun; | |
879 | ||
880 | spin_unlock_irqrestore(&mct_u232_port->lock, flags); | |
881 | ||
882 | dbg("%s (%d) TIOCGICOUNT RX=%d, TX=%d", | |
883 | __func__, port->number, icount->rx, icount->tx); | |
884 | return 0; | |
885 | } | |
886 | ||
68e24113 | 887 | module_usb_serial_driver(serial_drivers, id_table); |
1da177e4 | 888 | |
e19b2560 AC |
889 | MODULE_AUTHOR(DRIVER_AUTHOR); |
890 | MODULE_DESCRIPTION(DRIVER_DESC); | |
1da177e4 LT |
891 | MODULE_LICENSE("GPL"); |
892 | ||
893 | module_param(debug, bool, S_IRUGO | S_IWUSR); | |
894 | MODULE_PARM_DESC(debug, "Debug enabled or not"); |