Commit | Line | Data |
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6ce76104 FK |
1 | /* |
2 | * Copyright 2007, Frank A Kingswood <frank@kingswood-consulting.co.uk> | |
664d5df9 WC |
3 | * Copyright 2007, Werner Cornelius <werner@cornelius-consult.de> |
4 | * Copyright 2009, Boris Hajduk <boris@hajduk.org> | |
6ce76104 FK |
5 | * |
6 | * ch341.c implements a serial port driver for the Winchiphead CH341. | |
7 | * | |
8 | * The CH341 device can be used to implement an RS232 asynchronous | |
9 | * serial port, an IEEE-1284 parallel printer port or a memory-like | |
10 | * interface. In all cases the CH341 supports an I2C interface as well. | |
11 | * This driver only supports the asynchronous serial interface. | |
12 | * | |
13 | * This program is free software; you can redistribute it and/or | |
14 | * modify it under the terms of the GNU General Public License version | |
15 | * 2 as published by the Free Software Foundation. | |
16 | */ | |
17 | ||
18 | #include <linux/kernel.h> | |
19 | #include <linux/init.h> | |
20 | #include <linux/tty.h> | |
21 | #include <linux/module.h> | |
5a0e3ad6 | 22 | #include <linux/slab.h> |
6ce76104 FK |
23 | #include <linux/usb.h> |
24 | #include <linux/usb/serial.h> | |
25 | #include <linux/serial.h> | |
5be796f0 | 26 | #include <asm/unaligned.h> |
6ce76104 | 27 | |
664d5df9 | 28 | #define DEFAULT_BAUD_RATE 9600 |
6ce76104 FK |
29 | #define DEFAULT_TIMEOUT 1000 |
30 | ||
664d5df9 WC |
31 | /* flags for IO-Bits */ |
32 | #define CH341_BIT_RTS (1 << 6) | |
33 | #define CH341_BIT_DTR (1 << 5) | |
34 | ||
35 | /******************************/ | |
36 | /* interrupt pipe definitions */ | |
37 | /******************************/ | |
38 | /* always 4 interrupt bytes */ | |
39 | /* first irq byte normally 0x08 */ | |
40 | /* second irq byte base 0x7d + below */ | |
41 | /* third irq byte base 0x94 + below */ | |
42 | /* fourth irq byte normally 0xee */ | |
43 | ||
44 | /* second interrupt byte */ | |
45 | #define CH341_MULT_STAT 0x04 /* multiple status since last interrupt event */ | |
46 | ||
47 | /* status returned in third interrupt answer byte, inverted in data | |
48 | from irq */ | |
49 | #define CH341_BIT_CTS 0x01 | |
50 | #define CH341_BIT_DSR 0x02 | |
51 | #define CH341_BIT_RI 0x04 | |
52 | #define CH341_BIT_DCD 0x08 | |
53 | #define CH341_BITS_MODEM_STAT 0x0f /* all bits */ | |
54 | ||
55 | /*******************************/ | |
56 | /* baudrate calculation factor */ | |
57 | /*******************************/ | |
58 | #define CH341_BAUDBASE_FACTOR 1532620800 | |
59 | #define CH341_BAUDBASE_DIVMAX 3 | |
60 | ||
492896f0 TS |
61 | /* Break support - the information used to implement this was gleaned from |
62 | * the Net/FreeBSD uchcom.c driver by Takanori Watanabe. Domo arigato. | |
63 | */ | |
64 | ||
65 | #define CH341_REQ_WRITE_REG 0x9A | |
66 | #define CH341_REQ_READ_REG 0x95 | |
67 | #define CH341_REG_BREAK1 0x05 | |
68 | #define CH341_REG_BREAK2 0x18 | |
69 | #define CH341_NBREAK_BITS_REG1 0x01 | |
70 | #define CH341_NBREAK_BITS_REG2 0x40 | |
71 | ||
72 | ||
90ab5ee9 | 73 | static bool debug; |
6ce76104 | 74 | |
7d40d7e8 | 75 | static const struct usb_device_id id_table[] = { |
6ce76104 | 76 | { USB_DEVICE(0x4348, 0x5523) }, |
82078234 | 77 | { USB_DEVICE(0x1a86, 0x7523) }, |
d0781383 | 78 | { USB_DEVICE(0x1a86, 0x5523) }, |
6ce76104 FK |
79 | { }, |
80 | }; | |
81 | MODULE_DEVICE_TABLE(usb, id_table); | |
82 | ||
83 | struct ch341_private { | |
664d5df9 WC |
84 | spinlock_t lock; /* access lock */ |
85 | wait_queue_head_t delta_msr_wait; /* wait queue for modem status */ | |
86 | unsigned baud_rate; /* set baud rate */ | |
87 | u8 line_control; /* set line control value RTS/DTR */ | |
88 | u8 line_status; /* active status of modem control inputs */ | |
89 | u8 multi_status_change; /* status changed multiple since last call */ | |
6ce76104 FK |
90 | }; |
91 | ||
92 | static int ch341_control_out(struct usb_device *dev, u8 request, | |
93 | u16 value, u16 index) | |
94 | { | |
95 | int r; | |
96 | dbg("ch341_control_out(%02x,%02x,%04x,%04x)", USB_DIR_OUT|0x40, | |
97 | (int)request, (int)value, (int)index); | |
98 | ||
99 | r = usb_control_msg(dev, usb_sndctrlpipe(dev, 0), request, | |
100 | USB_TYPE_VENDOR | USB_RECIP_DEVICE | USB_DIR_OUT, | |
101 | value, index, NULL, 0, DEFAULT_TIMEOUT); | |
102 | ||
103 | return r; | |
104 | } | |
105 | ||
106 | static int ch341_control_in(struct usb_device *dev, | |
107 | u8 request, u16 value, u16 index, | |
108 | char *buf, unsigned bufsize) | |
109 | { | |
110 | int r; | |
111 | dbg("ch341_control_in(%02x,%02x,%04x,%04x,%p,%u)", USB_DIR_IN|0x40, | |
112 | (int)request, (int)value, (int)index, buf, (int)bufsize); | |
113 | ||
114 | r = usb_control_msg(dev, usb_rcvctrlpipe(dev, 0), request, | |
115 | USB_TYPE_VENDOR | USB_RECIP_DEVICE | USB_DIR_IN, | |
116 | value, index, buf, bufsize, DEFAULT_TIMEOUT); | |
117 | return r; | |
118 | } | |
119 | ||
93b6497d AB |
120 | static int ch341_set_baudrate(struct usb_device *dev, |
121 | struct ch341_private *priv) | |
6ce76104 FK |
122 | { |
123 | short a, b; | |
124 | int r; | |
664d5df9 WC |
125 | unsigned long factor; |
126 | short divisor; | |
6ce76104 | 127 | |
664d5df9 | 128 | if (!priv->baud_rate) |
6ce76104 | 129 | return -EINVAL; |
664d5df9 WC |
130 | factor = (CH341_BAUDBASE_FACTOR / priv->baud_rate); |
131 | divisor = CH341_BAUDBASE_DIVMAX; | |
132 | ||
133 | while ((factor > 0xfff0) && divisor) { | |
134 | factor >>= 3; | |
135 | divisor--; | |
6ce76104 FK |
136 | } |
137 | ||
664d5df9 WC |
138 | if (factor > 0xfff0) |
139 | return -EINVAL; | |
140 | ||
141 | factor = 0x10000 - factor; | |
142 | a = (factor & 0xff00) | divisor; | |
143 | b = factor & 0xff; | |
144 | ||
6ce76104 FK |
145 | r = ch341_control_out(dev, 0x9a, 0x1312, a); |
146 | if (!r) | |
147 | r = ch341_control_out(dev, 0x9a, 0x0f2c, b); | |
148 | ||
149 | return r; | |
150 | } | |
151 | ||
664d5df9 | 152 | static int ch341_set_handshake(struct usb_device *dev, u8 control) |
6ce76104 | 153 | { |
664d5df9 | 154 | return ch341_control_out(dev, 0xa4, ~control, 0); |
6ce76104 FK |
155 | } |
156 | ||
664d5df9 | 157 | static int ch341_get_status(struct usb_device *dev, struct ch341_private *priv) |
6ce76104 FK |
158 | { |
159 | char *buffer; | |
160 | int r; | |
161 | const unsigned size = 8; | |
664d5df9 | 162 | unsigned long flags; |
6ce76104 | 163 | |
6ce76104 FK |
164 | buffer = kmalloc(size, GFP_KERNEL); |
165 | if (!buffer) | |
166 | return -ENOMEM; | |
167 | ||
168 | r = ch341_control_in(dev, 0x95, 0x0706, 0, buffer, size); | |
c4d0f8cb | 169 | if (r < 0) |
6ce76104 FK |
170 | goto out; |
171 | ||
664d5df9 WC |
172 | /* setup the private status if available */ |
173 | if (r == 2) { | |
174 | r = 0; | |
175 | spin_lock_irqsave(&priv->lock, flags); | |
176 | priv->line_status = (~(*buffer)) & CH341_BITS_MODEM_STAT; | |
177 | priv->multi_status_change = 0; | |
178 | spin_unlock_irqrestore(&priv->lock, flags); | |
179 | } else | |
180 | r = -EPROTO; | |
6ce76104 FK |
181 | |
182 | out: kfree(buffer); | |
183 | return r; | |
184 | } | |
185 | ||
186 | /* -------------------------------------------------------------------------- */ | |
187 | ||
93b6497d | 188 | static int ch341_configure(struct usb_device *dev, struct ch341_private *priv) |
6ce76104 FK |
189 | { |
190 | char *buffer; | |
191 | int r; | |
192 | const unsigned size = 8; | |
193 | ||
6ce76104 FK |
194 | buffer = kmalloc(size, GFP_KERNEL); |
195 | if (!buffer) | |
196 | return -ENOMEM; | |
197 | ||
198 | /* expect two bytes 0x27 0x00 */ | |
199 | r = ch341_control_in(dev, 0x5f, 0, 0, buffer, size); | |
200 | if (r < 0) | |
201 | goto out; | |
202 | ||
203 | r = ch341_control_out(dev, 0xa1, 0, 0); | |
204 | if (r < 0) | |
205 | goto out; | |
206 | ||
207 | r = ch341_set_baudrate(dev, priv); | |
208 | if (r < 0) | |
209 | goto out; | |
210 | ||
211 | /* expect two bytes 0x56 0x00 */ | |
212 | r = ch341_control_in(dev, 0x95, 0x2518, 0, buffer, size); | |
213 | if (r < 0) | |
214 | goto out; | |
215 | ||
216 | r = ch341_control_out(dev, 0x9a, 0x2518, 0x0050); | |
217 | if (r < 0) | |
218 | goto out; | |
219 | ||
220 | /* expect 0xff 0xee */ | |
664d5df9 | 221 | r = ch341_get_status(dev, priv); |
6ce76104 FK |
222 | if (r < 0) |
223 | goto out; | |
224 | ||
225 | r = ch341_control_out(dev, 0xa1, 0x501f, 0xd90a); | |
226 | if (r < 0) | |
227 | goto out; | |
228 | ||
229 | r = ch341_set_baudrate(dev, priv); | |
230 | if (r < 0) | |
231 | goto out; | |
232 | ||
664d5df9 | 233 | r = ch341_set_handshake(dev, priv->line_control); |
6ce76104 FK |
234 | if (r < 0) |
235 | goto out; | |
236 | ||
237 | /* expect 0x9f 0xee */ | |
664d5df9 | 238 | r = ch341_get_status(dev, priv); |
6ce76104 FK |
239 | |
240 | out: kfree(buffer); | |
241 | return r; | |
242 | } | |
243 | ||
244 | /* allocate private data */ | |
245 | static int ch341_attach(struct usb_serial *serial) | |
246 | { | |
247 | struct ch341_private *priv; | |
248 | int r; | |
249 | ||
6ce76104 FK |
250 | /* private data */ |
251 | priv = kzalloc(sizeof(struct ch341_private), GFP_KERNEL); | |
252 | if (!priv) | |
253 | return -ENOMEM; | |
254 | ||
664d5df9 WC |
255 | spin_lock_init(&priv->lock); |
256 | init_waitqueue_head(&priv->delta_msr_wait); | |
6ce76104 | 257 | priv->baud_rate = DEFAULT_BAUD_RATE; |
664d5df9 | 258 | priv->line_control = CH341_BIT_RTS | CH341_BIT_DTR; |
6ce76104 FK |
259 | |
260 | r = ch341_configure(serial->dev, priv); | |
261 | if (r < 0) | |
262 | goto error; | |
263 | ||
264 | usb_set_serial_port_data(serial->port[0], priv); | |
265 | return 0; | |
266 | ||
267 | error: kfree(priv); | |
268 | return r; | |
269 | } | |
270 | ||
335f8514 AC |
271 | static int ch341_carrier_raised(struct usb_serial_port *port) |
272 | { | |
273 | struct ch341_private *priv = usb_get_serial_port_data(port); | |
274 | if (priv->line_status & CH341_BIT_DCD) | |
275 | return 1; | |
276 | return 0; | |
277 | } | |
278 | ||
279 | static void ch341_dtr_rts(struct usb_serial_port *port, int on) | |
664d5df9 WC |
280 | { |
281 | struct ch341_private *priv = usb_get_serial_port_data(port); | |
282 | unsigned long flags; | |
664d5df9 | 283 | |
335f8514 AC |
284 | /* drop DTR and RTS */ |
285 | spin_lock_irqsave(&priv->lock, flags); | |
286 | if (on) | |
287 | priv->line_control |= CH341_BIT_RTS | CH341_BIT_DTR; | |
288 | else | |
289 | priv->line_control &= ~(CH341_BIT_RTS | CH341_BIT_DTR); | |
290 | spin_unlock_irqrestore(&priv->lock, flags); | |
291 | ch341_set_handshake(port->serial->dev, priv->line_control); | |
292 | wake_up_interruptible(&priv->delta_msr_wait); | |
293 | } | |
294 | ||
295 | static void ch341_close(struct usb_serial_port *port) | |
296 | { | |
f26788da | 297 | usb_serial_generic_close(port); |
664d5df9 | 298 | usb_kill_urb(port->interrupt_in_urb); |
664d5df9 WC |
299 | } |
300 | ||
301 | ||
6ce76104 | 302 | /* open this device, set default parameters */ |
a509a7e4 | 303 | static int ch341_open(struct tty_struct *tty, struct usb_serial_port *port) |
6ce76104 FK |
304 | { |
305 | struct usb_serial *serial = port->serial; | |
306 | struct ch341_private *priv = usb_get_serial_port_data(serial->port[0]); | |
307 | int r; | |
308 | ||
6ce76104 | 309 | priv->baud_rate = DEFAULT_BAUD_RATE; |
6ce76104 FK |
310 | |
311 | r = ch341_configure(serial->dev, priv); | |
312 | if (r) | |
313 | goto out; | |
314 | ||
664d5df9 | 315 | r = ch341_set_handshake(serial->dev, priv->line_control); |
6ce76104 FK |
316 | if (r) |
317 | goto out; | |
318 | ||
319 | r = ch341_set_baudrate(serial->dev, priv); | |
320 | if (r) | |
321 | goto out; | |
322 | ||
664d5df9 | 323 | dbg("%s - submitting interrupt urb", __func__); |
664d5df9 WC |
324 | r = usb_submit_urb(port->interrupt_in_urb, GFP_KERNEL); |
325 | if (r) { | |
326 | dev_err(&port->dev, "%s - failed submitting interrupt urb," | |
327 | " error %d\n", __func__, r); | |
335f8514 | 328 | ch341_close(port); |
06946a66 | 329 | goto out; |
664d5df9 WC |
330 | } |
331 | ||
a509a7e4 | 332 | r = usb_serial_generic_open(tty, port); |
6ce76104 FK |
333 | |
334 | out: return r; | |
335 | } | |
336 | ||
337 | /* Old_termios contains the original termios settings and | |
338 | * tty->termios contains the new setting to be used. | |
339 | */ | |
95da310e AC |
340 | static void ch341_set_termios(struct tty_struct *tty, |
341 | struct usb_serial_port *port, struct ktermios *old_termios) | |
6ce76104 FK |
342 | { |
343 | struct ch341_private *priv = usb_get_serial_port_data(port); | |
6ce76104 | 344 | unsigned baud_rate; |
664d5df9 | 345 | unsigned long flags; |
6ce76104 | 346 | |
6ce76104 FK |
347 | baud_rate = tty_get_baud_rate(tty); |
348 | ||
664d5df9 WC |
349 | priv->baud_rate = baud_rate; |
350 | ||
351 | if (baud_rate) { | |
352 | spin_lock_irqsave(&priv->lock, flags); | |
353 | priv->line_control |= (CH341_BIT_DTR | CH341_BIT_RTS); | |
354 | spin_unlock_irqrestore(&priv->lock, flags); | |
355 | ch341_set_baudrate(port->serial->dev, priv); | |
356 | } else { | |
357 | spin_lock_irqsave(&priv->lock, flags); | |
358 | priv->line_control &= ~(CH341_BIT_DTR | CH341_BIT_RTS); | |
359 | spin_unlock_irqrestore(&priv->lock, flags); | |
6ce76104 FK |
360 | } |
361 | ||
664d5df9 | 362 | ch341_set_handshake(port->serial->dev, priv->line_control); |
6ce76104 FK |
363 | |
364 | /* Unimplemented: | |
365 | * (cflag & CSIZE) : data bits [5, 8] | |
366 | * (cflag & PARENB) : parity {NONE, EVEN, ODD} | |
367 | * (cflag & CSTOPB) : stop bits [1, 2] | |
368 | */ | |
664d5df9 WC |
369 | } |
370 | ||
492896f0 TS |
371 | static void ch341_break_ctl(struct tty_struct *tty, int break_state) |
372 | { | |
373 | const uint16_t ch341_break_reg = | |
374 | CH341_REG_BREAK1 | ((uint16_t) CH341_REG_BREAK2 << 8); | |
375 | struct usb_serial_port *port = tty->driver_data; | |
376 | int r; | |
377 | uint16_t reg_contents; | |
f2b5cc83 | 378 | uint8_t *break_reg; |
492896f0 | 379 | |
f2b5cc83 JH |
380 | break_reg = kmalloc(2, GFP_KERNEL); |
381 | if (!break_reg) { | |
382 | dev_err(&port->dev, "%s - kmalloc failed\n", __func__); | |
383 | return; | |
384 | } | |
385 | ||
492896f0 | 386 | r = ch341_control_in(port->serial->dev, CH341_REQ_READ_REG, |
f2b5cc83 | 387 | ch341_break_reg, 0, break_reg, 2); |
492896f0 | 388 | if (r < 0) { |
6a9b15fe JH |
389 | dev_err(&port->dev, "%s - USB control read error (%d)\n", |
390 | __func__, r); | |
f2b5cc83 | 391 | goto out; |
492896f0 TS |
392 | } |
393 | dbg("%s - initial ch341 break register contents - reg1: %x, reg2: %x", | |
394 | __func__, break_reg[0], break_reg[1]); | |
395 | if (break_state != 0) { | |
396 | dbg("%s - Enter break state requested", __func__); | |
397 | break_reg[0] &= ~CH341_NBREAK_BITS_REG1; | |
398 | break_reg[1] &= ~CH341_NBREAK_BITS_REG2; | |
399 | } else { | |
400 | dbg("%s - Leave break state requested", __func__); | |
401 | break_reg[0] |= CH341_NBREAK_BITS_REG1; | |
402 | break_reg[1] |= CH341_NBREAK_BITS_REG2; | |
403 | } | |
404 | dbg("%s - New ch341 break register contents - reg1: %x, reg2: %x", | |
405 | __func__, break_reg[0], break_reg[1]); | |
5be796f0 | 406 | reg_contents = get_unaligned_le16(break_reg); |
492896f0 TS |
407 | r = ch341_control_out(port->serial->dev, CH341_REQ_WRITE_REG, |
408 | ch341_break_reg, reg_contents); | |
409 | if (r < 0) | |
6a9b15fe JH |
410 | dev_err(&port->dev, "%s - USB control write error (%d)\n", |
411 | __func__, r); | |
f2b5cc83 JH |
412 | out: |
413 | kfree(break_reg); | |
492896f0 TS |
414 | } |
415 | ||
20b9d177 | 416 | static int ch341_tiocmset(struct tty_struct *tty, |
664d5df9 WC |
417 | unsigned int set, unsigned int clear) |
418 | { | |
419 | struct usb_serial_port *port = tty->driver_data; | |
420 | struct ch341_private *priv = usb_get_serial_port_data(port); | |
421 | unsigned long flags; | |
422 | u8 control; | |
423 | ||
424 | spin_lock_irqsave(&priv->lock, flags); | |
425 | if (set & TIOCM_RTS) | |
426 | priv->line_control |= CH341_BIT_RTS; | |
427 | if (set & TIOCM_DTR) | |
428 | priv->line_control |= CH341_BIT_DTR; | |
429 | if (clear & TIOCM_RTS) | |
430 | priv->line_control &= ~CH341_BIT_RTS; | |
431 | if (clear & TIOCM_DTR) | |
432 | priv->line_control &= ~CH341_BIT_DTR; | |
433 | control = priv->line_control; | |
434 | spin_unlock_irqrestore(&priv->lock, flags); | |
435 | ||
436 | return ch341_set_handshake(port->serial->dev, control); | |
437 | } | |
438 | ||
439 | static void ch341_read_int_callback(struct urb *urb) | |
440 | { | |
441 | struct usb_serial_port *port = (struct usb_serial_port *) urb->context; | |
442 | unsigned char *data = urb->transfer_buffer; | |
443 | unsigned int actual_length = urb->actual_length; | |
444 | int status; | |
445 | ||
664d5df9 WC |
446 | switch (urb->status) { |
447 | case 0: | |
448 | /* success */ | |
449 | break; | |
450 | case -ECONNRESET: | |
451 | case -ENOENT: | |
452 | case -ESHUTDOWN: | |
453 | /* this urb is terminated, clean up */ | |
454 | dbg("%s - urb shutting down with status: %d", __func__, | |
455 | urb->status); | |
456 | return; | |
457 | default: | |
458 | dbg("%s - nonzero urb status received: %d", __func__, | |
459 | urb->status); | |
460 | goto exit; | |
461 | } | |
462 | ||
463 | usb_serial_debug_data(debug, &port->dev, __func__, | |
464 | urb->actual_length, urb->transfer_buffer); | |
465 | ||
466 | if (actual_length >= 4) { | |
467 | struct ch341_private *priv = usb_get_serial_port_data(port); | |
468 | unsigned long flags; | |
d14fc1a7 | 469 | u8 prev_line_status = priv->line_status; |
664d5df9 WC |
470 | |
471 | spin_lock_irqsave(&priv->lock, flags); | |
472 | priv->line_status = (~(data[2])) & CH341_BITS_MODEM_STAT; | |
473 | if ((data[1] & CH341_MULT_STAT)) | |
474 | priv->multi_status_change = 1; | |
475 | spin_unlock_irqrestore(&priv->lock, flags); | |
d14fc1a7 LP |
476 | |
477 | if ((priv->line_status ^ prev_line_status) & CH341_BIT_DCD) { | |
478 | struct tty_struct *tty = tty_port_tty_get(&port->port); | |
479 | if (tty) | |
480 | usb_serial_handle_dcd_change(port, tty, | |
481 | priv->line_status & CH341_BIT_DCD); | |
482 | tty_kref_put(tty); | |
483 | } | |
484 | ||
664d5df9 WC |
485 | wake_up_interruptible(&priv->delta_msr_wait); |
486 | } | |
487 | ||
488 | exit: | |
489 | status = usb_submit_urb(urb, GFP_ATOMIC); | |
490 | if (status) | |
491 | dev_err(&urb->dev->dev, | |
492 | "%s - usb_submit_urb failed with result %d\n", | |
493 | __func__, status); | |
494 | } | |
495 | ||
496 | static int wait_modem_info(struct usb_serial_port *port, unsigned int arg) | |
497 | { | |
498 | struct ch341_private *priv = usb_get_serial_port_data(port); | |
499 | unsigned long flags; | |
500 | u8 prevstatus; | |
501 | u8 status; | |
502 | u8 changed; | |
503 | u8 multi_change = 0; | |
504 | ||
505 | spin_lock_irqsave(&priv->lock, flags); | |
506 | prevstatus = priv->line_status; | |
507 | priv->multi_status_change = 0; | |
508 | spin_unlock_irqrestore(&priv->lock, flags); | |
509 | ||
510 | while (!multi_change) { | |
511 | interruptible_sleep_on(&priv->delta_msr_wait); | |
512 | /* see if a signal did it */ | |
513 | if (signal_pending(current)) | |
514 | return -ERESTARTSYS; | |
515 | ||
516 | spin_lock_irqsave(&priv->lock, flags); | |
517 | status = priv->line_status; | |
518 | multi_change = priv->multi_status_change; | |
519 | spin_unlock_irqrestore(&priv->lock, flags); | |
520 | ||
521 | changed = prevstatus ^ status; | |
522 | ||
523 | if (((arg & TIOCM_RNG) && (changed & CH341_BIT_RI)) || | |
524 | ((arg & TIOCM_DSR) && (changed & CH341_BIT_DSR)) || | |
525 | ((arg & TIOCM_CD) && (changed & CH341_BIT_DCD)) || | |
526 | ((arg & TIOCM_CTS) && (changed & CH341_BIT_CTS))) { | |
527 | return 0; | |
528 | } | |
529 | prevstatus = status; | |
530 | } | |
531 | ||
532 | return 0; | |
533 | } | |
534 | ||
00a0d0d6 | 535 | static int ch341_ioctl(struct tty_struct *tty, |
664d5df9 WC |
536 | unsigned int cmd, unsigned long arg) |
537 | { | |
538 | struct usb_serial_port *port = tty->driver_data; | |
539 | dbg("%s (%d) cmd = 0x%04x", __func__, port->number, cmd); | |
540 | ||
541 | switch (cmd) { | |
542 | case TIOCMIWAIT: | |
543 | dbg("%s (%d) TIOCMIWAIT", __func__, port->number); | |
544 | return wait_modem_info(port, arg); | |
545 | ||
546 | default: | |
547 | dbg("%s not supported = 0x%04x", __func__, cmd); | |
548 | break; | |
549 | } | |
550 | ||
551 | return -ENOIOCTLCMD; | |
552 | } | |
553 | ||
60b33c13 | 554 | static int ch341_tiocmget(struct tty_struct *tty) |
664d5df9 WC |
555 | { |
556 | struct usb_serial_port *port = tty->driver_data; | |
557 | struct ch341_private *priv = usb_get_serial_port_data(port); | |
558 | unsigned long flags; | |
559 | u8 mcr; | |
560 | u8 status; | |
561 | unsigned int result; | |
562 | ||
664d5df9 WC |
563 | spin_lock_irqsave(&priv->lock, flags); |
564 | mcr = priv->line_control; | |
565 | status = priv->line_status; | |
566 | spin_unlock_irqrestore(&priv->lock, flags); | |
567 | ||
568 | result = ((mcr & CH341_BIT_DTR) ? TIOCM_DTR : 0) | |
569 | | ((mcr & CH341_BIT_RTS) ? TIOCM_RTS : 0) | |
570 | | ((status & CH341_BIT_CTS) ? TIOCM_CTS : 0) | |
571 | | ((status & CH341_BIT_DSR) ? TIOCM_DSR : 0) | |
572 | | ((status & CH341_BIT_RI) ? TIOCM_RI : 0) | |
573 | | ((status & CH341_BIT_DCD) ? TIOCM_CD : 0); | |
574 | ||
575 | dbg("%s - result = %x", __func__, result); | |
73f59308 | 576 | |
664d5df9 | 577 | return result; |
6ce76104 FK |
578 | } |
579 | ||
622b80cf | 580 | static int ch341_reset_resume(struct usb_serial *serial) |
1ded7ea4 | 581 | { |
1ded7ea4 ML |
582 | struct ch341_private *priv; |
583 | ||
1ded7ea4 ML |
584 | priv = usb_get_serial_port_data(serial->port[0]); |
585 | ||
2bfd1c96 GKH |
586 | /* reconfigure ch341 serial port after bus-reset */ |
587 | ch341_configure(serial->dev, priv); | |
1ded7ea4 ML |
588 | |
589 | return 0; | |
590 | } | |
591 | ||
6ce76104 FK |
592 | static struct usb_serial_driver ch341_device = { |
593 | .driver = { | |
594 | .owner = THIS_MODULE, | |
595 | .name = "ch341-uart", | |
596 | }, | |
664d5df9 | 597 | .id_table = id_table, |
664d5df9 WC |
598 | .num_ports = 1, |
599 | .open = ch341_open, | |
335f8514 AC |
600 | .dtr_rts = ch341_dtr_rts, |
601 | .carrier_raised = ch341_carrier_raised, | |
664d5df9 WC |
602 | .close = ch341_close, |
603 | .ioctl = ch341_ioctl, | |
604 | .set_termios = ch341_set_termios, | |
492896f0 | 605 | .break_ctl = ch341_break_ctl, |
664d5df9 WC |
606 | .tiocmget = ch341_tiocmget, |
607 | .tiocmset = ch341_tiocmset, | |
608 | .read_int_callback = ch341_read_int_callback, | |
609 | .attach = ch341_attach, | |
1c1eaba8 | 610 | .reset_resume = ch341_reset_resume, |
6ce76104 FK |
611 | }; |
612 | ||
08a4f6bc AS |
613 | static struct usb_serial_driver * const serial_drivers[] = { |
614 | &ch341_device, NULL | |
615 | }; | |
616 | ||
68e24113 | 617 | module_usb_serial_driver(serial_drivers, id_table); |
6ce76104 | 618 | |
6ce76104 FK |
619 | MODULE_LICENSE("GPL"); |
620 | ||
621 | module_param(debug, bool, S_IRUGO | S_IWUSR); | |
622 | MODULE_PARM_DESC(debug, "Debug enabled or not"); |