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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 | ||
6ce76104 FK |
73 | static int debug; |
74 | ||
7d40d7e8 | 75 | static const struct usb_device_id id_table[] = { |
6ce76104 | 76 | { USB_DEVICE(0x4348, 0x5523) }, |
82078234 | 77 | { USB_DEVICE(0x1a86, 0x7523) }, |
6ce76104 FK |
78 | { }, |
79 | }; | |
80 | MODULE_DEVICE_TABLE(usb, id_table); | |
81 | ||
82 | struct ch341_private { | |
664d5df9 WC |
83 | spinlock_t lock; /* access lock */ |
84 | wait_queue_head_t delta_msr_wait; /* wait queue for modem status */ | |
85 | unsigned baud_rate; /* set baud rate */ | |
86 | u8 line_control; /* set line control value RTS/DTR */ | |
87 | u8 line_status; /* active status of modem control inputs */ | |
88 | u8 multi_status_change; /* status changed multiple since last call */ | |
6ce76104 FK |
89 | }; |
90 | ||
91 | static int ch341_control_out(struct usb_device *dev, u8 request, | |
92 | u16 value, u16 index) | |
93 | { | |
94 | int r; | |
95 | dbg("ch341_control_out(%02x,%02x,%04x,%04x)", USB_DIR_OUT|0x40, | |
96 | (int)request, (int)value, (int)index); | |
97 | ||
98 | r = usb_control_msg(dev, usb_sndctrlpipe(dev, 0), request, | |
99 | USB_TYPE_VENDOR | USB_RECIP_DEVICE | USB_DIR_OUT, | |
100 | value, index, NULL, 0, DEFAULT_TIMEOUT); | |
101 | ||
102 | return r; | |
103 | } | |
104 | ||
105 | static int ch341_control_in(struct usb_device *dev, | |
106 | u8 request, u16 value, u16 index, | |
107 | char *buf, unsigned bufsize) | |
108 | { | |
109 | int r; | |
110 | dbg("ch341_control_in(%02x,%02x,%04x,%04x,%p,%u)", USB_DIR_IN|0x40, | |
111 | (int)request, (int)value, (int)index, buf, (int)bufsize); | |
112 | ||
113 | r = usb_control_msg(dev, usb_rcvctrlpipe(dev, 0), request, | |
114 | USB_TYPE_VENDOR | USB_RECIP_DEVICE | USB_DIR_IN, | |
115 | value, index, buf, bufsize, DEFAULT_TIMEOUT); | |
116 | return r; | |
117 | } | |
118 | ||
93b6497d AB |
119 | static int ch341_set_baudrate(struct usb_device *dev, |
120 | struct ch341_private *priv) | |
6ce76104 FK |
121 | { |
122 | short a, b; | |
123 | int r; | |
664d5df9 WC |
124 | unsigned long factor; |
125 | short divisor; | |
6ce76104 FK |
126 | |
127 | dbg("ch341_set_baudrate(%d)", priv->baud_rate); | |
664d5df9 WC |
128 | |
129 | if (!priv->baud_rate) | |
6ce76104 | 130 | return -EINVAL; |
664d5df9 WC |
131 | factor = (CH341_BAUDBASE_FACTOR / priv->baud_rate); |
132 | divisor = CH341_BAUDBASE_DIVMAX; | |
133 | ||
134 | while ((factor > 0xfff0) && divisor) { | |
135 | factor >>= 3; | |
136 | divisor--; | |
6ce76104 FK |
137 | } |
138 | ||
664d5df9 WC |
139 | if (factor > 0xfff0) |
140 | return -EINVAL; | |
141 | ||
142 | factor = 0x10000 - factor; | |
143 | a = (factor & 0xff00) | divisor; | |
144 | b = factor & 0xff; | |
145 | ||
6ce76104 FK |
146 | r = ch341_control_out(dev, 0x9a, 0x1312, a); |
147 | if (!r) | |
148 | r = ch341_control_out(dev, 0x9a, 0x0f2c, b); | |
149 | ||
150 | return r; | |
151 | } | |
152 | ||
664d5df9 | 153 | static int ch341_set_handshake(struct usb_device *dev, u8 control) |
6ce76104 | 154 | { |
664d5df9 WC |
155 | dbg("ch341_set_handshake(0x%02x)", control); |
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 FK |
165 | |
166 | dbg("ch341_get_status()"); | |
167 | ||
168 | buffer = kmalloc(size, GFP_KERNEL); | |
169 | if (!buffer) | |
170 | return -ENOMEM; | |
171 | ||
172 | r = ch341_control_in(dev, 0x95, 0x0706, 0, buffer, size); | |
c4d0f8cb | 173 | if (r < 0) |
6ce76104 FK |
174 | goto out; |
175 | ||
664d5df9 WC |
176 | /* setup the private status if available */ |
177 | if (r == 2) { | |
178 | r = 0; | |
179 | spin_lock_irqsave(&priv->lock, flags); | |
180 | priv->line_status = (~(*buffer)) & CH341_BITS_MODEM_STAT; | |
181 | priv->multi_status_change = 0; | |
182 | spin_unlock_irqrestore(&priv->lock, flags); | |
183 | } else | |
184 | r = -EPROTO; | |
6ce76104 FK |
185 | |
186 | out: kfree(buffer); | |
187 | return r; | |
188 | } | |
189 | ||
190 | /* -------------------------------------------------------------------------- */ | |
191 | ||
93b6497d | 192 | static int ch341_configure(struct usb_device *dev, struct ch341_private *priv) |
6ce76104 FK |
193 | { |
194 | char *buffer; | |
195 | int r; | |
196 | const unsigned size = 8; | |
197 | ||
198 | dbg("ch341_configure()"); | |
199 | ||
200 | buffer = kmalloc(size, GFP_KERNEL); | |
201 | if (!buffer) | |
202 | return -ENOMEM; | |
203 | ||
204 | /* expect two bytes 0x27 0x00 */ | |
205 | r = ch341_control_in(dev, 0x5f, 0, 0, buffer, size); | |
206 | if (r < 0) | |
207 | goto out; | |
208 | ||
209 | r = ch341_control_out(dev, 0xa1, 0, 0); | |
210 | if (r < 0) | |
211 | goto out; | |
212 | ||
213 | r = ch341_set_baudrate(dev, priv); | |
214 | if (r < 0) | |
215 | goto out; | |
216 | ||
217 | /* expect two bytes 0x56 0x00 */ | |
218 | r = ch341_control_in(dev, 0x95, 0x2518, 0, buffer, size); | |
219 | if (r < 0) | |
220 | goto out; | |
221 | ||
222 | r = ch341_control_out(dev, 0x9a, 0x2518, 0x0050); | |
223 | if (r < 0) | |
224 | goto out; | |
225 | ||
226 | /* expect 0xff 0xee */ | |
664d5df9 | 227 | r = ch341_get_status(dev, priv); |
6ce76104 FK |
228 | if (r < 0) |
229 | goto out; | |
230 | ||
231 | r = ch341_control_out(dev, 0xa1, 0x501f, 0xd90a); | |
232 | if (r < 0) | |
233 | goto out; | |
234 | ||
235 | r = ch341_set_baudrate(dev, priv); | |
236 | if (r < 0) | |
237 | goto out; | |
238 | ||
664d5df9 | 239 | r = ch341_set_handshake(dev, priv->line_control); |
6ce76104 FK |
240 | if (r < 0) |
241 | goto out; | |
242 | ||
243 | /* expect 0x9f 0xee */ | |
664d5df9 | 244 | r = ch341_get_status(dev, priv); |
6ce76104 FK |
245 | |
246 | out: kfree(buffer); | |
247 | return r; | |
248 | } | |
249 | ||
250 | /* allocate private data */ | |
251 | static int ch341_attach(struct usb_serial *serial) | |
252 | { | |
253 | struct ch341_private *priv; | |
254 | int r; | |
255 | ||
256 | dbg("ch341_attach()"); | |
257 | ||
258 | /* private data */ | |
259 | priv = kzalloc(sizeof(struct ch341_private), GFP_KERNEL); | |
260 | if (!priv) | |
261 | return -ENOMEM; | |
262 | ||
664d5df9 WC |
263 | spin_lock_init(&priv->lock); |
264 | init_waitqueue_head(&priv->delta_msr_wait); | |
6ce76104 | 265 | priv->baud_rate = DEFAULT_BAUD_RATE; |
664d5df9 | 266 | priv->line_control = CH341_BIT_RTS | CH341_BIT_DTR; |
6ce76104 FK |
267 | |
268 | r = ch341_configure(serial->dev, priv); | |
269 | if (r < 0) | |
270 | goto error; | |
271 | ||
272 | usb_set_serial_port_data(serial->port[0], priv); | |
273 | return 0; | |
274 | ||
275 | error: kfree(priv); | |
276 | return r; | |
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 | dbg("%s - port %d", __func__, port->number); |
293 | /* drop DTR and RTS */ | |
294 | spin_lock_irqsave(&priv->lock, flags); | |
295 | if (on) | |
296 | priv->line_control |= CH341_BIT_RTS | CH341_BIT_DTR; | |
297 | else | |
298 | priv->line_control &= ~(CH341_BIT_RTS | CH341_BIT_DTR); | |
299 | spin_unlock_irqrestore(&priv->lock, flags); | |
300 | ch341_set_handshake(port->serial->dev, priv->line_control); | |
301 | wake_up_interruptible(&priv->delta_msr_wait); | |
302 | } | |
303 | ||
304 | static void ch341_close(struct usb_serial_port *port) | |
305 | { | |
664d5df9 WC |
306 | dbg("%s - port %d", __func__, port->number); |
307 | ||
308 | /* shutdown our urbs */ | |
309 | dbg("%s - shutting down urbs", __func__); | |
310 | usb_kill_urb(port->write_urb); | |
311 | usb_kill_urb(port->read_urb); | |
312 | usb_kill_urb(port->interrupt_in_urb); | |
664d5df9 WC |
313 | } |
314 | ||
315 | ||
6ce76104 | 316 | /* open this device, set default parameters */ |
a509a7e4 | 317 | static int ch341_open(struct tty_struct *tty, struct usb_serial_port *port) |
6ce76104 FK |
318 | { |
319 | struct usb_serial *serial = port->serial; | |
320 | struct ch341_private *priv = usb_get_serial_port_data(serial->port[0]); | |
321 | int r; | |
322 | ||
323 | dbg("ch341_open()"); | |
324 | ||
325 | priv->baud_rate = DEFAULT_BAUD_RATE; | |
6ce76104 FK |
326 | |
327 | r = ch341_configure(serial->dev, priv); | |
328 | if (r) | |
329 | goto out; | |
330 | ||
664d5df9 | 331 | r = ch341_set_handshake(serial->dev, priv->line_control); |
6ce76104 FK |
332 | if (r) |
333 | goto out; | |
334 | ||
335 | r = ch341_set_baudrate(serial->dev, priv); | |
336 | if (r) | |
337 | goto out; | |
338 | ||
664d5df9 WC |
339 | dbg("%s - submitting interrupt urb", __func__); |
340 | port->interrupt_in_urb->dev = serial->dev; | |
341 | r = usb_submit_urb(port->interrupt_in_urb, GFP_KERNEL); | |
342 | if (r) { | |
343 | dev_err(&port->dev, "%s - failed submitting interrupt urb," | |
344 | " error %d\n", __func__, r); | |
335f8514 | 345 | ch341_close(port); |
664d5df9 WC |
346 | return -EPROTO; |
347 | } | |
348 | ||
a509a7e4 | 349 | r = usb_serial_generic_open(tty, port); |
6ce76104 FK |
350 | |
351 | out: return r; | |
352 | } | |
353 | ||
354 | /* Old_termios contains the original termios settings and | |
355 | * tty->termios contains the new setting to be used. | |
356 | */ | |
95da310e AC |
357 | static void ch341_set_termios(struct tty_struct *tty, |
358 | struct usb_serial_port *port, struct ktermios *old_termios) | |
6ce76104 FK |
359 | { |
360 | struct ch341_private *priv = usb_get_serial_port_data(port); | |
6ce76104 | 361 | unsigned baud_rate; |
664d5df9 | 362 | unsigned long flags; |
6ce76104 FK |
363 | |
364 | dbg("ch341_set_termios()"); | |
365 | ||
6ce76104 FK |
366 | baud_rate = tty_get_baud_rate(tty); |
367 | ||
664d5df9 WC |
368 | priv->baud_rate = baud_rate; |
369 | ||
370 | if (baud_rate) { | |
371 | spin_lock_irqsave(&priv->lock, flags); | |
372 | priv->line_control |= (CH341_BIT_DTR | CH341_BIT_RTS); | |
373 | spin_unlock_irqrestore(&priv->lock, flags); | |
374 | ch341_set_baudrate(port->serial->dev, priv); | |
375 | } else { | |
376 | spin_lock_irqsave(&priv->lock, flags); | |
377 | priv->line_control &= ~(CH341_BIT_DTR | CH341_BIT_RTS); | |
378 | spin_unlock_irqrestore(&priv->lock, flags); | |
6ce76104 FK |
379 | } |
380 | ||
664d5df9 | 381 | ch341_set_handshake(port->serial->dev, priv->line_control); |
6ce76104 FK |
382 | |
383 | /* Unimplemented: | |
384 | * (cflag & CSIZE) : data bits [5, 8] | |
385 | * (cflag & PARENB) : parity {NONE, EVEN, ODD} | |
386 | * (cflag & CSTOPB) : stop bits [1, 2] | |
387 | */ | |
664d5df9 WC |
388 | } |
389 | ||
492896f0 TS |
390 | static void ch341_break_ctl(struct tty_struct *tty, int break_state) |
391 | { | |
392 | const uint16_t ch341_break_reg = | |
393 | CH341_REG_BREAK1 | ((uint16_t) CH341_REG_BREAK2 << 8); | |
394 | struct usb_serial_port *port = tty->driver_data; | |
395 | int r; | |
396 | uint16_t reg_contents; | |
f2b5cc83 | 397 | uint8_t *break_reg; |
492896f0 TS |
398 | |
399 | dbg("%s()", __func__); | |
400 | ||
f2b5cc83 JH |
401 | break_reg = kmalloc(2, GFP_KERNEL); |
402 | if (!break_reg) { | |
403 | dev_err(&port->dev, "%s - kmalloc failed\n", __func__); | |
404 | return; | |
405 | } | |
406 | ||
492896f0 | 407 | r = ch341_control_in(port->serial->dev, CH341_REQ_READ_REG, |
f2b5cc83 | 408 | ch341_break_reg, 0, break_reg, 2); |
492896f0 | 409 | if (r < 0) { |
6a9b15fe JH |
410 | dev_err(&port->dev, "%s - USB control read error (%d)\n", |
411 | __func__, r); | |
f2b5cc83 | 412 | goto out; |
492896f0 TS |
413 | } |
414 | dbg("%s - initial ch341 break register contents - reg1: %x, reg2: %x", | |
415 | __func__, break_reg[0], break_reg[1]); | |
416 | if (break_state != 0) { | |
417 | dbg("%s - Enter break state requested", __func__); | |
418 | break_reg[0] &= ~CH341_NBREAK_BITS_REG1; | |
419 | break_reg[1] &= ~CH341_NBREAK_BITS_REG2; | |
420 | } else { | |
421 | dbg("%s - Leave break state requested", __func__); | |
422 | break_reg[0] |= CH341_NBREAK_BITS_REG1; | |
423 | break_reg[1] |= CH341_NBREAK_BITS_REG2; | |
424 | } | |
425 | dbg("%s - New ch341 break register contents - reg1: %x, reg2: %x", | |
426 | __func__, break_reg[0], break_reg[1]); | |
5be796f0 | 427 | reg_contents = get_unaligned_le16(break_reg); |
492896f0 TS |
428 | r = ch341_control_out(port->serial->dev, CH341_REQ_WRITE_REG, |
429 | ch341_break_reg, reg_contents); | |
430 | if (r < 0) | |
6a9b15fe JH |
431 | dev_err(&port->dev, "%s - USB control write error (%d)\n", |
432 | __func__, r); | |
f2b5cc83 JH |
433 | out: |
434 | kfree(break_reg); | |
492896f0 TS |
435 | } |
436 | ||
664d5df9 WC |
437 | static int ch341_tiocmset(struct tty_struct *tty, struct file *file, |
438 | unsigned int set, unsigned int clear) | |
439 | { | |
440 | struct usb_serial_port *port = tty->driver_data; | |
441 | struct ch341_private *priv = usb_get_serial_port_data(port); | |
442 | unsigned long flags; | |
443 | u8 control; | |
444 | ||
445 | spin_lock_irqsave(&priv->lock, flags); | |
446 | if (set & TIOCM_RTS) | |
447 | priv->line_control |= CH341_BIT_RTS; | |
448 | if (set & TIOCM_DTR) | |
449 | priv->line_control |= CH341_BIT_DTR; | |
450 | if (clear & TIOCM_RTS) | |
451 | priv->line_control &= ~CH341_BIT_RTS; | |
452 | if (clear & TIOCM_DTR) | |
453 | priv->line_control &= ~CH341_BIT_DTR; | |
454 | control = priv->line_control; | |
455 | spin_unlock_irqrestore(&priv->lock, flags); | |
456 | ||
457 | return ch341_set_handshake(port->serial->dev, control); | |
458 | } | |
459 | ||
460 | static void ch341_read_int_callback(struct urb *urb) | |
461 | { | |
462 | struct usb_serial_port *port = (struct usb_serial_port *) urb->context; | |
463 | unsigned char *data = urb->transfer_buffer; | |
464 | unsigned int actual_length = urb->actual_length; | |
465 | int status; | |
466 | ||
467 | dbg("%s (%d)", __func__, port->number); | |
468 | ||
469 | switch (urb->status) { | |
470 | case 0: | |
471 | /* success */ | |
472 | break; | |
473 | case -ECONNRESET: | |
474 | case -ENOENT: | |
475 | case -ESHUTDOWN: | |
476 | /* this urb is terminated, clean up */ | |
477 | dbg("%s - urb shutting down with status: %d", __func__, | |
478 | urb->status); | |
479 | return; | |
480 | default: | |
481 | dbg("%s - nonzero urb status received: %d", __func__, | |
482 | urb->status); | |
483 | goto exit; | |
484 | } | |
485 | ||
486 | usb_serial_debug_data(debug, &port->dev, __func__, | |
487 | urb->actual_length, urb->transfer_buffer); | |
488 | ||
489 | if (actual_length >= 4) { | |
490 | struct ch341_private *priv = usb_get_serial_port_data(port); | |
491 | unsigned long flags; | |
492 | ||
493 | spin_lock_irqsave(&priv->lock, flags); | |
494 | priv->line_status = (~(data[2])) & CH341_BITS_MODEM_STAT; | |
495 | if ((data[1] & CH341_MULT_STAT)) | |
496 | priv->multi_status_change = 1; | |
497 | spin_unlock_irqrestore(&priv->lock, flags); | |
498 | wake_up_interruptible(&priv->delta_msr_wait); | |
499 | } | |
500 | ||
501 | exit: | |
502 | status = usb_submit_urb(urb, GFP_ATOMIC); | |
503 | if (status) | |
504 | dev_err(&urb->dev->dev, | |
505 | "%s - usb_submit_urb failed with result %d\n", | |
506 | __func__, status); | |
507 | } | |
508 | ||
509 | static int wait_modem_info(struct usb_serial_port *port, unsigned int arg) | |
510 | { | |
511 | struct ch341_private *priv = usb_get_serial_port_data(port); | |
512 | unsigned long flags; | |
513 | u8 prevstatus; | |
514 | u8 status; | |
515 | u8 changed; | |
516 | u8 multi_change = 0; | |
517 | ||
518 | spin_lock_irqsave(&priv->lock, flags); | |
519 | prevstatus = priv->line_status; | |
520 | priv->multi_status_change = 0; | |
521 | spin_unlock_irqrestore(&priv->lock, flags); | |
522 | ||
523 | while (!multi_change) { | |
524 | interruptible_sleep_on(&priv->delta_msr_wait); | |
525 | /* see if a signal did it */ | |
526 | if (signal_pending(current)) | |
527 | return -ERESTARTSYS; | |
528 | ||
529 | spin_lock_irqsave(&priv->lock, flags); | |
530 | status = priv->line_status; | |
531 | multi_change = priv->multi_status_change; | |
532 | spin_unlock_irqrestore(&priv->lock, flags); | |
533 | ||
534 | changed = prevstatus ^ status; | |
535 | ||
536 | if (((arg & TIOCM_RNG) && (changed & CH341_BIT_RI)) || | |
537 | ((arg & TIOCM_DSR) && (changed & CH341_BIT_DSR)) || | |
538 | ((arg & TIOCM_CD) && (changed & CH341_BIT_DCD)) || | |
539 | ((arg & TIOCM_CTS) && (changed & CH341_BIT_CTS))) { | |
540 | return 0; | |
541 | } | |
542 | prevstatus = status; | |
543 | } | |
544 | ||
545 | return 0; | |
546 | } | |
547 | ||
548 | /*static int ch341_ioctl(struct usb_serial_port *port, struct file *file,*/ | |
549 | static int ch341_ioctl(struct tty_struct *tty, struct file *file, | |
550 | unsigned int cmd, unsigned long arg) | |
551 | { | |
552 | struct usb_serial_port *port = tty->driver_data; | |
553 | dbg("%s (%d) cmd = 0x%04x", __func__, port->number, cmd); | |
554 | ||
555 | switch (cmd) { | |
556 | case TIOCMIWAIT: | |
557 | dbg("%s (%d) TIOCMIWAIT", __func__, port->number); | |
558 | return wait_modem_info(port, arg); | |
559 | ||
560 | default: | |
561 | dbg("%s not supported = 0x%04x", __func__, cmd); | |
562 | break; | |
563 | } | |
564 | ||
565 | return -ENOIOCTLCMD; | |
566 | } | |
567 | ||
568 | static int ch341_tiocmget(struct tty_struct *tty, struct file *file) | |
569 | { | |
570 | struct usb_serial_port *port = tty->driver_data; | |
571 | struct ch341_private *priv = usb_get_serial_port_data(port); | |
572 | unsigned long flags; | |
573 | u8 mcr; | |
574 | u8 status; | |
575 | unsigned int result; | |
576 | ||
577 | dbg("%s (%d)", __func__, port->number); | |
578 | ||
579 | spin_lock_irqsave(&priv->lock, flags); | |
580 | mcr = priv->line_control; | |
581 | status = priv->line_status; | |
582 | spin_unlock_irqrestore(&priv->lock, flags); | |
583 | ||
584 | result = ((mcr & CH341_BIT_DTR) ? TIOCM_DTR : 0) | |
585 | | ((mcr & CH341_BIT_RTS) ? TIOCM_RTS : 0) | |
586 | | ((status & CH341_BIT_CTS) ? TIOCM_CTS : 0) | |
587 | | ((status & CH341_BIT_DSR) ? TIOCM_DSR : 0) | |
588 | | ((status & CH341_BIT_RI) ? TIOCM_RI : 0) | |
589 | | ((status & CH341_BIT_DCD) ? TIOCM_CD : 0); | |
590 | ||
591 | dbg("%s - result = %x", __func__, result); | |
73f59308 | 592 | |
664d5df9 | 593 | return result; |
6ce76104 FK |
594 | } |
595 | ||
1ded7ea4 ML |
596 | |
597 | static int ch341_reset_resume(struct usb_interface *intf) | |
598 | { | |
599 | struct usb_device *dev = interface_to_usbdev(intf); | |
600 | struct usb_serial *serial = NULL; | |
601 | struct ch341_private *priv; | |
602 | ||
603 | serial = usb_get_intfdata(intf); | |
604 | priv = usb_get_serial_port_data(serial->port[0]); | |
605 | ||
606 | /*reconfigure ch341 serial port after bus-reset*/ | |
607 | ch341_configure(dev, priv); | |
608 | ||
609 | usb_serial_resume(intf); | |
610 | ||
611 | return 0; | |
612 | } | |
613 | ||
6ce76104 FK |
614 | static struct usb_driver ch341_driver = { |
615 | .name = "ch341", | |
616 | .probe = usb_serial_probe, | |
617 | .disconnect = usb_serial_disconnect, | |
1ded7ea4 ML |
618 | .suspend = usb_serial_suspend, |
619 | .resume = usb_serial_resume, | |
620 | .reset_resume = ch341_reset_resume, | |
6ce76104 FK |
621 | .id_table = id_table, |
622 | .no_dynamic_id = 1, | |
1ded7ea4 | 623 | .supports_autosuspend = 1, |
6ce76104 FK |
624 | }; |
625 | ||
626 | static struct usb_serial_driver ch341_device = { | |
627 | .driver = { | |
628 | .owner = THIS_MODULE, | |
629 | .name = "ch341-uart", | |
630 | }, | |
664d5df9 WC |
631 | .id_table = id_table, |
632 | .usb_driver = &ch341_driver, | |
633 | .num_ports = 1, | |
634 | .open = ch341_open, | |
335f8514 AC |
635 | .dtr_rts = ch341_dtr_rts, |
636 | .carrier_raised = ch341_carrier_raised, | |
664d5df9 WC |
637 | .close = ch341_close, |
638 | .ioctl = ch341_ioctl, | |
639 | .set_termios = ch341_set_termios, | |
492896f0 | 640 | .break_ctl = ch341_break_ctl, |
664d5df9 WC |
641 | .tiocmget = ch341_tiocmget, |
642 | .tiocmset = ch341_tiocmset, | |
643 | .read_int_callback = ch341_read_int_callback, | |
644 | .attach = ch341_attach, | |
6ce76104 FK |
645 | }; |
646 | ||
647 | static int __init ch341_init(void) | |
648 | { | |
649 | int retval; | |
650 | ||
651 | retval = usb_serial_register(&ch341_device); | |
652 | if (retval) | |
653 | return retval; | |
654 | retval = usb_register(&ch341_driver); | |
655 | if (retval) | |
656 | usb_serial_deregister(&ch341_device); | |
657 | return retval; | |
658 | } | |
659 | ||
660 | static void __exit ch341_exit(void) | |
661 | { | |
662 | usb_deregister(&ch341_driver); | |
663 | usb_serial_deregister(&ch341_device); | |
664 | } | |
665 | ||
666 | module_init(ch341_init); | |
667 | module_exit(ch341_exit); | |
668 | MODULE_LICENSE("GPL"); | |
669 | ||
670 | module_param(debug, bool, S_IRUGO | S_IWUSR); | |
671 | MODULE_PARM_DESC(debug, "Debug enabled or not"); | |
672 | ||
673 | /* EOF ch341.c */ |