Commit | Line | Data |
---|---|---|
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> | |
6ce76104 FK |
19 | #include <linux/tty.h> |
20 | #include <linux/module.h> | |
5a0e3ad6 | 21 | #include <linux/slab.h> |
6ce76104 FK |
22 | #include <linux/usb.h> |
23 | #include <linux/usb/serial.h> | |
24 | #include <linux/serial.h> | |
5be796f0 | 25 | #include <asm/unaligned.h> |
6ce76104 | 26 | |
664d5df9 | 27 | #define DEFAULT_BAUD_RATE 9600 |
6ce76104 FK |
28 | #define DEFAULT_TIMEOUT 1000 |
29 | ||
664d5df9 WC |
30 | /* flags for IO-Bits */ |
31 | #define CH341_BIT_RTS (1 << 6) | |
32 | #define CH341_BIT_DTR (1 << 5) | |
33 | ||
34 | /******************************/ | |
35 | /* interrupt pipe definitions */ | |
36 | /******************************/ | |
37 | /* always 4 interrupt bytes */ | |
38 | /* first irq byte normally 0x08 */ | |
39 | /* second irq byte base 0x7d + below */ | |
40 | /* third irq byte base 0x94 + below */ | |
41 | /* fourth irq byte normally 0xee */ | |
42 | ||
43 | /* second interrupt byte */ | |
44 | #define CH341_MULT_STAT 0x04 /* multiple status since last interrupt event */ | |
45 | ||
46 | /* status returned in third interrupt answer byte, inverted in data | |
47 | from irq */ | |
48 | #define CH341_BIT_CTS 0x01 | |
49 | #define CH341_BIT_DSR 0x02 | |
50 | #define CH341_BIT_RI 0x04 | |
51 | #define CH341_BIT_DCD 0x08 | |
52 | #define CH341_BITS_MODEM_STAT 0x0f /* all bits */ | |
53 | ||
54 | /*******************************/ | |
55 | /* baudrate calculation factor */ | |
56 | /*******************************/ | |
57 | #define CH341_BAUDBASE_FACTOR 1532620800 | |
58 | #define CH341_BAUDBASE_DIVMAX 3 | |
59 | ||
492896f0 TS |
60 | /* Break support - the information used to implement this was gleaned from |
61 | * the Net/FreeBSD uchcom.c driver by Takanori Watanabe. Domo arigato. | |
62 | */ | |
63 | ||
64 | #define CH341_REQ_WRITE_REG 0x9A | |
65 | #define CH341_REQ_READ_REG 0x95 | |
66 | #define CH341_REG_BREAK1 0x05 | |
67 | #define CH341_REG_BREAK2 0x18 | |
68 | #define CH341_NBREAK_BITS_REG1 0x01 | |
69 | #define CH341_NBREAK_BITS_REG2 0x40 | |
70 | ||
71 | ||
7d40d7e8 | 72 | static const struct usb_device_id id_table[] = { |
6ce76104 | 73 | { USB_DEVICE(0x4348, 0x5523) }, |
82078234 | 74 | { USB_DEVICE(0x1a86, 0x7523) }, |
d0781383 | 75 | { USB_DEVICE(0x1a86, 0x5523) }, |
6ce76104 FK |
76 | { }, |
77 | }; | |
78 | MODULE_DEVICE_TABLE(usb, id_table); | |
79 | ||
80 | struct ch341_private { | |
664d5df9 | 81 | spinlock_t lock; /* access lock */ |
664d5df9 WC |
82 | unsigned baud_rate; /* set baud rate */ |
83 | u8 line_control; /* set line control value RTS/DTR */ | |
84 | u8 line_status; /* active status of modem control inputs */ | |
6ce76104 FK |
85 | }; |
86 | ||
aa91def4 NP |
87 | static void ch341_set_termios(struct tty_struct *tty, |
88 | struct usb_serial_port *port, | |
89 | struct ktermios *old_termios); | |
90 | ||
6ce76104 FK |
91 | static int ch341_control_out(struct usb_device *dev, u8 request, |
92 | u16 value, u16 index) | |
93 | { | |
94 | int r; | |
79cbeeaf GKH |
95 | |
96 | dev_dbg(&dev->dev, "ch341_control_out(%02x,%02x,%04x,%04x)\n", | |
97 | USB_DIR_OUT|0x40, (int)request, (int)value, (int)index); | |
6ce76104 FK |
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; | |
79cbeeaf GKH |
111 | |
112 | dev_dbg(&dev->dev, "ch341_control_in(%02x,%02x,%04x,%04x,%p,%u)\n", | |
113 | USB_DIR_IN|0x40, (int)request, (int)value, (int)index, buf, | |
114 | (int)bufsize); | |
6ce76104 FK |
115 | |
116 | r = usb_control_msg(dev, usb_rcvctrlpipe(dev, 0), request, | |
117 | USB_TYPE_VENDOR | USB_RECIP_DEVICE | USB_DIR_IN, | |
118 | value, index, buf, bufsize, DEFAULT_TIMEOUT); | |
119 | return r; | |
120 | } | |
121 | ||
93b6497d AB |
122 | static int ch341_set_baudrate(struct usb_device *dev, |
123 | struct ch341_private *priv) | |
6ce76104 FK |
124 | { |
125 | short a, b; | |
126 | int r; | |
664d5df9 WC |
127 | unsigned long factor; |
128 | short divisor; | |
6ce76104 | 129 | |
664d5df9 | 130 | if (!priv->baud_rate) |
6ce76104 | 131 | return -EINVAL; |
664d5df9 WC |
132 | factor = (CH341_BAUDBASE_FACTOR / priv->baud_rate); |
133 | divisor = CH341_BAUDBASE_DIVMAX; | |
134 | ||
135 | while ((factor > 0xfff0) && divisor) { | |
136 | factor >>= 3; | |
137 | divisor--; | |
6ce76104 FK |
138 | } |
139 | ||
664d5df9 WC |
140 | if (factor > 0xfff0) |
141 | return -EINVAL; | |
142 | ||
143 | factor = 0x10000 - factor; | |
144 | a = (factor & 0xff00) | divisor; | |
145 | b = factor & 0xff; | |
146 | ||
6ce76104 FK |
147 | r = ch341_control_out(dev, 0x9a, 0x1312, a); |
148 | if (!r) | |
149 | r = ch341_control_out(dev, 0x9a, 0x0f2c, b); | |
150 | ||
151 | return r; | |
152 | } | |
153 | ||
664d5df9 | 154 | static int ch341_set_handshake(struct usb_device *dev, u8 control) |
6ce76104 | 155 | { |
664d5df9 | 156 | return ch341_control_out(dev, 0xa4, ~control, 0); |
6ce76104 FK |
157 | } |
158 | ||
664d5df9 | 159 | static int ch341_get_status(struct usb_device *dev, struct ch341_private *priv) |
6ce76104 FK |
160 | { |
161 | char *buffer; | |
162 | int r; | |
163 | const unsigned size = 8; | |
664d5df9 | 164 | unsigned long flags; |
6ce76104 | 165 | |
6ce76104 FK |
166 | buffer = kmalloc(size, GFP_KERNEL); |
167 | if (!buffer) | |
168 | return -ENOMEM; | |
169 | ||
170 | r = ch341_control_in(dev, 0x95, 0x0706, 0, buffer, size); | |
c4d0f8cb | 171 | if (r < 0) |
6ce76104 FK |
172 | goto out; |
173 | ||
664d5df9 WC |
174 | /* setup the private status if available */ |
175 | if (r == 2) { | |
176 | r = 0; | |
177 | spin_lock_irqsave(&priv->lock, flags); | |
178 | priv->line_status = (~(*buffer)) & CH341_BITS_MODEM_STAT; | |
664d5df9 WC |
179 | spin_unlock_irqrestore(&priv->lock, flags); |
180 | } else | |
181 | r = -EPROTO; | |
6ce76104 FK |
182 | |
183 | out: kfree(buffer); | |
184 | return r; | |
185 | } | |
186 | ||
187 | /* -------------------------------------------------------------------------- */ | |
188 | ||
93b6497d | 189 | static int ch341_configure(struct usb_device *dev, struct ch341_private *priv) |
6ce76104 FK |
190 | { |
191 | char *buffer; | |
192 | int r; | |
193 | const unsigned size = 8; | |
194 | ||
6ce76104 FK |
195 | buffer = kmalloc(size, GFP_KERNEL); |
196 | if (!buffer) | |
197 | return -ENOMEM; | |
198 | ||
199 | /* expect two bytes 0x27 0x00 */ | |
200 | r = ch341_control_in(dev, 0x5f, 0, 0, buffer, size); | |
201 | if (r < 0) | |
202 | goto out; | |
203 | ||
204 | r = ch341_control_out(dev, 0xa1, 0, 0); | |
205 | if (r < 0) | |
206 | goto out; | |
207 | ||
208 | r = ch341_set_baudrate(dev, priv); | |
209 | if (r < 0) | |
210 | goto out; | |
211 | ||
212 | /* expect two bytes 0x56 0x00 */ | |
213 | r = ch341_control_in(dev, 0x95, 0x2518, 0, buffer, size); | |
214 | if (r < 0) | |
215 | goto out; | |
216 | ||
217 | r = ch341_control_out(dev, 0x9a, 0x2518, 0x0050); | |
218 | if (r < 0) | |
219 | goto out; | |
220 | ||
221 | /* expect 0xff 0xee */ | |
664d5df9 | 222 | r = ch341_get_status(dev, priv); |
6ce76104 FK |
223 | if (r < 0) |
224 | goto out; | |
225 | ||
226 | r = ch341_control_out(dev, 0xa1, 0x501f, 0xd90a); | |
227 | if (r < 0) | |
228 | goto out; | |
229 | ||
230 | r = ch341_set_baudrate(dev, priv); | |
231 | if (r < 0) | |
232 | goto out; | |
233 | ||
664d5df9 | 234 | r = ch341_set_handshake(dev, priv->line_control); |
6ce76104 FK |
235 | if (r < 0) |
236 | goto out; | |
237 | ||
238 | /* expect 0x9f 0xee */ | |
664d5df9 | 239 | r = ch341_get_status(dev, priv); |
6ce76104 FK |
240 | |
241 | out: kfree(buffer); | |
242 | return r; | |
243 | } | |
244 | ||
456c5be5 | 245 | static int ch341_port_probe(struct usb_serial_port *port) |
6ce76104 FK |
246 | { |
247 | struct ch341_private *priv; | |
248 | int r; | |
249 | ||
6ce76104 FK |
250 | priv = kzalloc(sizeof(struct ch341_private), GFP_KERNEL); |
251 | if (!priv) | |
252 | return -ENOMEM; | |
253 | ||
664d5df9 | 254 | spin_lock_init(&priv->lock); |
6ce76104 | 255 | priv->baud_rate = DEFAULT_BAUD_RATE; |
664d5df9 | 256 | priv->line_control = CH341_BIT_RTS | CH341_BIT_DTR; |
6ce76104 | 257 | |
456c5be5 | 258 | r = ch341_configure(port->serial->dev, priv); |
6ce76104 FK |
259 | if (r < 0) |
260 | goto error; | |
261 | ||
456c5be5 | 262 | usb_set_serial_port_data(port, priv); |
6ce76104 FK |
263 | return 0; |
264 | ||
265 | error: kfree(priv); | |
266 | return r; | |
267 | } | |
268 | ||
456c5be5 JH |
269 | static int ch341_port_remove(struct usb_serial_port *port) |
270 | { | |
271 | struct ch341_private *priv; | |
272 | ||
273 | priv = usb_get_serial_port_data(port); | |
274 | kfree(priv); | |
275 | ||
276 | return 0; | |
277 | } | |
278 | ||
335f8514 AC |
279 | static int ch341_carrier_raised(struct usb_serial_port *port) |
280 | { | |
281 | struct ch341_private *priv = usb_get_serial_port_data(port); | |
282 | if (priv->line_status & CH341_BIT_DCD) | |
283 | return 1; | |
284 | return 0; | |
285 | } | |
286 | ||
287 | static void ch341_dtr_rts(struct usb_serial_port *port, int on) | |
664d5df9 WC |
288 | { |
289 | struct ch341_private *priv = usb_get_serial_port_data(port); | |
290 | unsigned long flags; | |
664d5df9 | 291 | |
335f8514 AC |
292 | /* drop DTR and RTS */ |
293 | spin_lock_irqsave(&priv->lock, flags); | |
294 | if (on) | |
295 | priv->line_control |= CH341_BIT_RTS | CH341_BIT_DTR; | |
296 | else | |
297 | priv->line_control &= ~(CH341_BIT_RTS | CH341_BIT_DTR); | |
298 | spin_unlock_irqrestore(&priv->lock, flags); | |
299 | ch341_set_handshake(port->serial->dev, priv->line_control); | |
335f8514 AC |
300 | } |
301 | ||
302 | static void ch341_close(struct usb_serial_port *port) | |
303 | { | |
f26788da | 304 | usb_serial_generic_close(port); |
664d5df9 | 305 | usb_kill_urb(port->interrupt_in_urb); |
664d5df9 WC |
306 | } |
307 | ||
308 | ||
6ce76104 | 309 | /* open this device, set default parameters */ |
a509a7e4 | 310 | static int ch341_open(struct tty_struct *tty, struct usb_serial_port *port) |
6ce76104 FK |
311 | { |
312 | struct usb_serial *serial = port->serial; | |
456c5be5 | 313 | struct ch341_private *priv = usb_get_serial_port_data(port); |
6ce76104 FK |
314 | int r; |
315 | ||
6ce76104 FK |
316 | r = ch341_configure(serial->dev, priv); |
317 | if (r) | |
318 | goto out; | |
319 | ||
aa91def4 NP |
320 | if (tty) |
321 | ch341_set_termios(tty, port, NULL); | |
6ce76104 | 322 | |
d9a38a87 | 323 | dev_dbg(&port->dev, "%s - submitting interrupt urb\n", __func__); |
664d5df9 WC |
324 | r = usb_submit_urb(port->interrupt_in_urb, GFP_KERNEL); |
325 | if (r) { | |
d9a38a87 JH |
326 | dev_err(&port->dev, "%s - failed to submit interrupt urb: %d\n", |
327 | __func__, r); | |
06946a66 | 328 | goto out; |
664d5df9 WC |
329 | } |
330 | ||
a509a7e4 | 331 | r = usb_serial_generic_open(tty, port); |
6ce76104 FK |
332 | |
333 | out: return r; | |
334 | } | |
335 | ||
336 | /* Old_termios contains the original termios settings and | |
337 | * tty->termios contains the new setting to be used. | |
338 | */ | |
95da310e AC |
339 | static void ch341_set_termios(struct tty_struct *tty, |
340 | struct usb_serial_port *port, struct ktermios *old_termios) | |
6ce76104 FK |
341 | { |
342 | struct ch341_private *priv = usb_get_serial_port_data(port); | |
6ce76104 | 343 | unsigned baud_rate; |
664d5df9 | 344 | unsigned long flags; |
6ce76104 | 345 | |
6ce76104 FK |
346 | baud_rate = tty_get_baud_rate(tty); |
347 | ||
664d5df9 WC |
348 | priv->baud_rate = baud_rate; |
349 | ||
350 | if (baud_rate) { | |
351 | spin_lock_irqsave(&priv->lock, flags); | |
352 | priv->line_control |= (CH341_BIT_DTR | CH341_BIT_RTS); | |
353 | spin_unlock_irqrestore(&priv->lock, flags); | |
354 | ch341_set_baudrate(port->serial->dev, priv); | |
355 | } else { | |
356 | spin_lock_irqsave(&priv->lock, flags); | |
357 | priv->line_control &= ~(CH341_BIT_DTR | CH341_BIT_RTS); | |
358 | spin_unlock_irqrestore(&priv->lock, flags); | |
6ce76104 FK |
359 | } |
360 | ||
664d5df9 | 361 | ch341_set_handshake(port->serial->dev, priv->line_control); |
6ce76104 FK |
362 | |
363 | /* Unimplemented: | |
364 | * (cflag & CSIZE) : data bits [5, 8] | |
365 | * (cflag & PARENB) : parity {NONE, EVEN, ODD} | |
366 | * (cflag & CSTOPB) : stop bits [1, 2] | |
367 | */ | |
664d5df9 WC |
368 | } |
369 | ||
492896f0 TS |
370 | static void ch341_break_ctl(struct tty_struct *tty, int break_state) |
371 | { | |
372 | const uint16_t ch341_break_reg = | |
373 | CH341_REG_BREAK1 | ((uint16_t) CH341_REG_BREAK2 << 8); | |
374 | struct usb_serial_port *port = tty->driver_data; | |
375 | int r; | |
376 | uint16_t reg_contents; | |
f2b5cc83 | 377 | uint8_t *break_reg; |
492896f0 | 378 | |
f2b5cc83 | 379 | break_reg = kmalloc(2, GFP_KERNEL); |
10c642d0 | 380 | if (!break_reg) |
f2b5cc83 | 381 | return; |
f2b5cc83 | 382 | |
492896f0 | 383 | r = ch341_control_in(port->serial->dev, CH341_REQ_READ_REG, |
f2b5cc83 | 384 | ch341_break_reg, 0, break_reg, 2); |
492896f0 | 385 | if (r < 0) { |
6a9b15fe JH |
386 | dev_err(&port->dev, "%s - USB control read error (%d)\n", |
387 | __func__, r); | |
f2b5cc83 | 388 | goto out; |
492896f0 | 389 | } |
79cbeeaf GKH |
390 | dev_dbg(&port->dev, "%s - initial ch341 break register contents - reg1: %x, reg2: %x\n", |
391 | __func__, break_reg[0], break_reg[1]); | |
492896f0 | 392 | if (break_state != 0) { |
79cbeeaf | 393 | dev_dbg(&port->dev, "%s - Enter break state requested\n", __func__); |
492896f0 TS |
394 | break_reg[0] &= ~CH341_NBREAK_BITS_REG1; |
395 | break_reg[1] &= ~CH341_NBREAK_BITS_REG2; | |
396 | } else { | |
79cbeeaf | 397 | dev_dbg(&port->dev, "%s - Leave break state requested\n", __func__); |
492896f0 TS |
398 | break_reg[0] |= CH341_NBREAK_BITS_REG1; |
399 | break_reg[1] |= CH341_NBREAK_BITS_REG2; | |
400 | } | |
79cbeeaf GKH |
401 | dev_dbg(&port->dev, "%s - New ch341 break register contents - reg1: %x, reg2: %x\n", |
402 | __func__, break_reg[0], break_reg[1]); | |
5be796f0 | 403 | reg_contents = get_unaligned_le16(break_reg); |
492896f0 TS |
404 | r = ch341_control_out(port->serial->dev, CH341_REQ_WRITE_REG, |
405 | ch341_break_reg, reg_contents); | |
406 | if (r < 0) | |
6a9b15fe JH |
407 | dev_err(&port->dev, "%s - USB control write error (%d)\n", |
408 | __func__, r); | |
f2b5cc83 JH |
409 | out: |
410 | kfree(break_reg); | |
492896f0 TS |
411 | } |
412 | ||
20b9d177 | 413 | static int ch341_tiocmset(struct tty_struct *tty, |
664d5df9 WC |
414 | unsigned int set, unsigned int clear) |
415 | { | |
416 | struct usb_serial_port *port = tty->driver_data; | |
417 | struct ch341_private *priv = usb_get_serial_port_data(port); | |
418 | unsigned long flags; | |
419 | u8 control; | |
420 | ||
421 | spin_lock_irqsave(&priv->lock, flags); | |
422 | if (set & TIOCM_RTS) | |
423 | priv->line_control |= CH341_BIT_RTS; | |
424 | if (set & TIOCM_DTR) | |
425 | priv->line_control |= CH341_BIT_DTR; | |
426 | if (clear & TIOCM_RTS) | |
427 | priv->line_control &= ~CH341_BIT_RTS; | |
428 | if (clear & TIOCM_DTR) | |
429 | priv->line_control &= ~CH341_BIT_DTR; | |
430 | control = priv->line_control; | |
431 | spin_unlock_irqrestore(&priv->lock, flags); | |
432 | ||
433 | return ch341_set_handshake(port->serial->dev, control); | |
434 | } | |
435 | ||
ac035628 JH |
436 | static void ch341_update_line_status(struct usb_serial_port *port, |
437 | unsigned char *data, size_t len) | |
438 | { | |
439 | struct ch341_private *priv = usb_get_serial_port_data(port); | |
b770081f | 440 | struct tty_struct *tty; |
ac035628 | 441 | unsigned long flags; |
b770081f JH |
442 | u8 status; |
443 | u8 delta; | |
ac035628 JH |
444 | |
445 | if (len < 4) | |
446 | return; | |
447 | ||
b770081f JH |
448 | status = ~data[2] & CH341_BITS_MODEM_STAT; |
449 | ||
ac035628 | 450 | spin_lock_irqsave(&priv->lock, flags); |
b770081f JH |
451 | delta = status ^ priv->line_status; |
452 | priv->line_status = status; | |
ac035628 JH |
453 | spin_unlock_irqrestore(&priv->lock, flags); |
454 | ||
fd74b0b1 JH |
455 | if (data[1] & CH341_MULT_STAT) |
456 | dev_dbg(&port->dev, "%s - multiple status change\n", __func__); | |
457 | ||
d984fe91 JH |
458 | if (!delta) |
459 | return; | |
460 | ||
5e409a26 JH |
461 | if (delta & CH341_BIT_CTS) |
462 | port->icount.cts++; | |
463 | if (delta & CH341_BIT_DSR) | |
464 | port->icount.dsr++; | |
465 | if (delta & CH341_BIT_RI) | |
466 | port->icount.rng++; | |
b770081f | 467 | if (delta & CH341_BIT_DCD) { |
5e409a26 | 468 | port->icount.dcd++; |
b770081f JH |
469 | tty = tty_port_tty_get(&port->port); |
470 | if (tty) { | |
ac035628 | 471 | usb_serial_handle_dcd_change(port, tty, |
b770081f JH |
472 | status & CH341_BIT_DCD); |
473 | tty_kref_put(tty); | |
474 | } | |
ac035628 JH |
475 | } |
476 | ||
477 | wake_up_interruptible(&port->port.delta_msr_wait); | |
478 | } | |
479 | ||
664d5df9 WC |
480 | static void ch341_read_int_callback(struct urb *urb) |
481 | { | |
271ec2d2 | 482 | struct usb_serial_port *port = urb->context; |
664d5df9 | 483 | unsigned char *data = urb->transfer_buffer; |
271ec2d2 | 484 | unsigned int len = urb->actual_length; |
664d5df9 WC |
485 | int status; |
486 | ||
664d5df9 WC |
487 | switch (urb->status) { |
488 | case 0: | |
489 | /* success */ | |
490 | break; | |
491 | case -ECONNRESET: | |
492 | case -ENOENT: | |
493 | case -ESHUTDOWN: | |
494 | /* this urb is terminated, clean up */ | |
271ec2d2 | 495 | dev_dbg(&urb->dev->dev, "%s - urb shutting down: %d\n", |
79cbeeaf | 496 | __func__, urb->status); |
664d5df9 WC |
497 | return; |
498 | default: | |
271ec2d2 | 499 | dev_dbg(&urb->dev->dev, "%s - nonzero urb status: %d\n", |
79cbeeaf | 500 | __func__, urb->status); |
664d5df9 WC |
501 | goto exit; |
502 | } | |
503 | ||
271ec2d2 JH |
504 | usb_serial_debug_data(&port->dev, __func__, len, data); |
505 | ch341_update_line_status(port, data, len); | |
664d5df9 WC |
506 | exit: |
507 | status = usb_submit_urb(urb, GFP_ATOMIC); | |
271ec2d2 JH |
508 | if (status) { |
509 | dev_err(&urb->dev->dev, "%s - usb_submit_urb failed: %d\n", | |
664d5df9 | 510 | __func__, status); |
271ec2d2 | 511 | } |
664d5df9 WC |
512 | } |
513 | ||
60b33c13 | 514 | static int ch341_tiocmget(struct tty_struct *tty) |
664d5df9 WC |
515 | { |
516 | struct usb_serial_port *port = tty->driver_data; | |
517 | struct ch341_private *priv = usb_get_serial_port_data(port); | |
518 | unsigned long flags; | |
519 | u8 mcr; | |
520 | u8 status; | |
521 | unsigned int result; | |
522 | ||
664d5df9 WC |
523 | spin_lock_irqsave(&priv->lock, flags); |
524 | mcr = priv->line_control; | |
525 | status = priv->line_status; | |
526 | spin_unlock_irqrestore(&priv->lock, flags); | |
527 | ||
528 | result = ((mcr & CH341_BIT_DTR) ? TIOCM_DTR : 0) | |
529 | | ((mcr & CH341_BIT_RTS) ? TIOCM_RTS : 0) | |
530 | | ((status & CH341_BIT_CTS) ? TIOCM_CTS : 0) | |
531 | | ((status & CH341_BIT_DSR) ? TIOCM_DSR : 0) | |
532 | | ((status & CH341_BIT_RI) ? TIOCM_RI : 0) | |
533 | | ((status & CH341_BIT_DCD) ? TIOCM_CD : 0); | |
534 | ||
79cbeeaf | 535 | dev_dbg(&port->dev, "%s - result = %x\n", __func__, result); |
73f59308 | 536 | |
664d5df9 | 537 | return result; |
6ce76104 FK |
538 | } |
539 | ||
622b80cf | 540 | static int ch341_reset_resume(struct usb_serial *serial) |
1ded7ea4 | 541 | { |
1ded7ea4 ML |
542 | struct ch341_private *priv; |
543 | ||
1ded7ea4 ML |
544 | priv = usb_get_serial_port_data(serial->port[0]); |
545 | ||
2bfd1c96 GKH |
546 | /* reconfigure ch341 serial port after bus-reset */ |
547 | ch341_configure(serial->dev, priv); | |
1ded7ea4 ML |
548 | |
549 | return 0; | |
550 | } | |
551 | ||
6ce76104 FK |
552 | static struct usb_serial_driver ch341_device = { |
553 | .driver = { | |
554 | .owner = THIS_MODULE, | |
555 | .name = "ch341-uart", | |
556 | }, | |
664d5df9 | 557 | .id_table = id_table, |
664d5df9 WC |
558 | .num_ports = 1, |
559 | .open = ch341_open, | |
335f8514 AC |
560 | .dtr_rts = ch341_dtr_rts, |
561 | .carrier_raised = ch341_carrier_raised, | |
664d5df9 | 562 | .close = ch341_close, |
664d5df9 | 563 | .set_termios = ch341_set_termios, |
492896f0 | 564 | .break_ctl = ch341_break_ctl, |
664d5df9 WC |
565 | .tiocmget = ch341_tiocmget, |
566 | .tiocmset = ch341_tiocmset, | |
5e409a26 | 567 | .tiocmiwait = usb_serial_generic_tiocmiwait, |
664d5df9 | 568 | .read_int_callback = ch341_read_int_callback, |
456c5be5 JH |
569 | .port_probe = ch341_port_probe, |
570 | .port_remove = ch341_port_remove, | |
1c1eaba8 | 571 | .reset_resume = ch341_reset_resume, |
6ce76104 FK |
572 | }; |
573 | ||
08a4f6bc AS |
574 | static struct usb_serial_driver * const serial_drivers[] = { |
575 | &ch341_device, NULL | |
576 | }; | |
577 | ||
68e24113 | 578 | module_usb_serial_driver(serial_drivers, id_table); |
6ce76104 | 579 | |
6ce76104 | 580 | MODULE_LICENSE("GPL"); |