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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> | |
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 | ||
6fde8d29 | 64 | #define CH341_REQ_READ_VERSION 0x5F |
492896f0 TS |
65 | #define CH341_REQ_WRITE_REG 0x9A |
66 | #define CH341_REQ_READ_REG 0x95 | |
6fde8d29 AT |
67 | #define CH341_REQ_SERIAL_INIT 0xA1 |
68 | #define CH341_REQ_MODEM_CTRL 0xA4 | |
69 | ||
70 | #define CH341_REG_BREAK 0x05 | |
71 | #define CH341_REG_LCR 0x18 | |
72 | #define CH341_NBREAK_BITS 0x01 | |
73 | ||
74 | #define CH341_LCR_ENABLE_RX 0x80 | |
75 | #define CH341_LCR_ENABLE_TX 0x40 | |
76 | #define CH341_LCR_MARK_SPACE 0x20 | |
77 | #define CH341_LCR_PAR_EVEN 0x10 | |
78 | #define CH341_LCR_ENABLE_PAR 0x08 | |
79 | #define CH341_LCR_STOP_BITS_2 0x04 | |
80 | #define CH341_LCR_CS8 0x03 | |
81 | #define CH341_LCR_CS7 0x02 | |
82 | #define CH341_LCR_CS6 0x01 | |
83 | #define CH341_LCR_CS5 0x00 | |
492896f0 | 84 | |
7d40d7e8 | 85 | static const struct usb_device_id id_table[] = { |
6ce76104 | 86 | { USB_DEVICE(0x4348, 0x5523) }, |
82078234 | 87 | { USB_DEVICE(0x1a86, 0x7523) }, |
d0781383 | 88 | { USB_DEVICE(0x1a86, 0x5523) }, |
6ce76104 FK |
89 | { }, |
90 | }; | |
91 | MODULE_DEVICE_TABLE(usb, id_table); | |
92 | ||
93 | struct ch341_private { | |
664d5df9 | 94 | spinlock_t lock; /* access lock */ |
664d5df9 WC |
95 | unsigned baud_rate; /* set baud rate */ |
96 | u8 line_control; /* set line control value RTS/DTR */ | |
97 | u8 line_status; /* active status of modem control inputs */ | |
3cca8624 | 98 | u8 lcr; |
6ce76104 FK |
99 | }; |
100 | ||
aa91def4 NP |
101 | static void ch341_set_termios(struct tty_struct *tty, |
102 | struct usb_serial_port *port, | |
103 | struct ktermios *old_termios); | |
104 | ||
6ce76104 FK |
105 | static int ch341_control_out(struct usb_device *dev, u8 request, |
106 | u16 value, u16 index) | |
107 | { | |
108 | int r; | |
79cbeeaf GKH |
109 | |
110 | dev_dbg(&dev->dev, "ch341_control_out(%02x,%02x,%04x,%04x)\n", | |
111 | USB_DIR_OUT|0x40, (int)request, (int)value, (int)index); | |
6ce76104 FK |
112 | |
113 | r = usb_control_msg(dev, usb_sndctrlpipe(dev, 0), request, | |
114 | USB_TYPE_VENDOR | USB_RECIP_DEVICE | USB_DIR_OUT, | |
115 | value, index, NULL, 0, DEFAULT_TIMEOUT); | |
2d5a9c72 JH |
116 | if (r < 0) |
117 | dev_err(&dev->dev, "failed to send control message: %d\n", r); | |
6ce76104 FK |
118 | |
119 | return r; | |
120 | } | |
121 | ||
122 | static int ch341_control_in(struct usb_device *dev, | |
123 | u8 request, u16 value, u16 index, | |
124 | char *buf, unsigned bufsize) | |
125 | { | |
126 | int r; | |
79cbeeaf GKH |
127 | |
128 | dev_dbg(&dev->dev, "ch341_control_in(%02x,%02x,%04x,%04x,%p,%u)\n", | |
129 | USB_DIR_IN|0x40, (int)request, (int)value, (int)index, buf, | |
130 | (int)bufsize); | |
6ce76104 FK |
131 | |
132 | r = usb_control_msg(dev, usb_rcvctrlpipe(dev, 0), request, | |
133 | USB_TYPE_VENDOR | USB_RECIP_DEVICE | USB_DIR_IN, | |
134 | value, index, buf, bufsize, DEFAULT_TIMEOUT); | |
2d5a9c72 JH |
135 | if (r < bufsize) { |
136 | if (r >= 0) { | |
137 | dev_err(&dev->dev, | |
138 | "short control message received (%d < %u)\n", | |
139 | r, bufsize); | |
140 | r = -EIO; | |
141 | } | |
142 | ||
143 | dev_err(&dev->dev, "failed to receive control message: %d\n", | |
144 | r); | |
145 | return r; | |
146 | } | |
147 | ||
148 | return 0; | |
6ce76104 FK |
149 | } |
150 | ||
55fa15b5 JH |
151 | static int ch341_set_baudrate_lcr(struct usb_device *dev, |
152 | struct ch341_private *priv, u8 lcr) | |
6ce76104 | 153 | { |
4e46c410 | 154 | short a; |
6ce76104 | 155 | int r; |
664d5df9 WC |
156 | unsigned long factor; |
157 | short divisor; | |
6ce76104 | 158 | |
664d5df9 | 159 | if (!priv->baud_rate) |
6ce76104 | 160 | return -EINVAL; |
664d5df9 WC |
161 | factor = (CH341_BAUDBASE_FACTOR / priv->baud_rate); |
162 | divisor = CH341_BAUDBASE_DIVMAX; | |
163 | ||
164 | while ((factor > 0xfff0) && divisor) { | |
165 | factor >>= 3; | |
166 | divisor--; | |
6ce76104 FK |
167 | } |
168 | ||
664d5df9 WC |
169 | if (factor > 0xfff0) |
170 | return -EINVAL; | |
171 | ||
172 | factor = 0x10000 - factor; | |
173 | a = (factor & 0xff00) | divisor; | |
664d5df9 | 174 | |
55fa15b5 JH |
175 | /* |
176 | * CH341A buffers data until a full endpoint-size packet (32 bytes) | |
177 | * has been received unless bit 7 is set. | |
178 | */ | |
179 | a |= BIT(7); | |
180 | ||
181 | r = ch341_control_out(dev, CH341_REQ_WRITE_REG, 0x1312, a); | |
182 | if (r) | |
183 | return r; | |
184 | ||
185 | r = ch341_control_out(dev, CH341_REQ_WRITE_REG, 0x2518, lcr); | |
186 | if (r) | |
187 | return r; | |
6ce76104 FK |
188 | |
189 | return r; | |
190 | } | |
191 | ||
664d5df9 | 192 | static int ch341_set_handshake(struct usb_device *dev, u8 control) |
6ce76104 | 193 | { |
6fde8d29 | 194 | return ch341_control_out(dev, CH341_REQ_MODEM_CTRL, ~control, 0); |
6ce76104 FK |
195 | } |
196 | ||
664d5df9 | 197 | static int ch341_get_status(struct usb_device *dev, struct ch341_private *priv) |
6ce76104 | 198 | { |
2d5a9c72 | 199 | const unsigned int size = 2; |
6ce76104 FK |
200 | char *buffer; |
201 | int r; | |
664d5df9 | 202 | unsigned long flags; |
6ce76104 | 203 | |
6ce76104 FK |
204 | buffer = kmalloc(size, GFP_KERNEL); |
205 | if (!buffer) | |
206 | return -ENOMEM; | |
207 | ||
6fde8d29 | 208 | r = ch341_control_in(dev, CH341_REQ_READ_REG, 0x0706, 0, buffer, size); |
c4d0f8cb | 209 | if (r < 0) |
6ce76104 FK |
210 | goto out; |
211 | ||
2d5a9c72 JH |
212 | spin_lock_irqsave(&priv->lock, flags); |
213 | priv->line_status = (~(*buffer)) & CH341_BITS_MODEM_STAT; | |
214 | spin_unlock_irqrestore(&priv->lock, flags); | |
6ce76104 FK |
215 | |
216 | out: kfree(buffer); | |
217 | return r; | |
218 | } | |
219 | ||
220 | /* -------------------------------------------------------------------------- */ | |
221 | ||
93b6497d | 222 | static int ch341_configure(struct usb_device *dev, struct ch341_private *priv) |
6ce76104 | 223 | { |
2d5a9c72 | 224 | const unsigned int size = 2; |
6ce76104 FK |
225 | char *buffer; |
226 | int r; | |
6ce76104 | 227 | |
6ce76104 FK |
228 | buffer = kmalloc(size, GFP_KERNEL); |
229 | if (!buffer) | |
230 | return -ENOMEM; | |
231 | ||
232 | /* expect two bytes 0x27 0x00 */ | |
6fde8d29 | 233 | r = ch341_control_in(dev, CH341_REQ_READ_VERSION, 0, 0, buffer, size); |
6ce76104 FK |
234 | if (r < 0) |
235 | goto out; | |
a98b6900 | 236 | dev_dbg(&dev->dev, "Chip version: 0x%02x\n", buffer[0]); |
6ce76104 | 237 | |
6fde8d29 | 238 | r = ch341_control_out(dev, CH341_REQ_SERIAL_INIT, 0, 0); |
6ce76104 FK |
239 | if (r < 0) |
240 | goto out; | |
241 | ||
6ce76104 | 242 | /* expect two bytes 0x56 0x00 */ |
6fde8d29 | 243 | r = ch341_control_in(dev, CH341_REQ_READ_REG, 0x2518, 0, buffer, size); |
6ce76104 FK |
244 | if (r < 0) |
245 | goto out; | |
246 | ||
6fde8d29 | 247 | r = ch341_control_out(dev, CH341_REQ_WRITE_REG, 0x2518, 0x0050); |
6ce76104 FK |
248 | if (r < 0) |
249 | goto out; | |
250 | ||
55fa15b5 | 251 | r = ch341_set_baudrate_lcr(dev, priv, priv->lcr); |
6ce76104 FK |
252 | if (r < 0) |
253 | goto out; | |
254 | ||
664d5df9 | 255 | r = ch341_set_handshake(dev, priv->line_control); |
6ce76104 FK |
256 | |
257 | out: kfree(buffer); | |
258 | return r; | |
259 | } | |
260 | ||
456c5be5 | 261 | static int ch341_port_probe(struct usb_serial_port *port) |
6ce76104 FK |
262 | { |
263 | struct ch341_private *priv; | |
264 | int r; | |
265 | ||
6ce76104 FK |
266 | priv = kzalloc(sizeof(struct ch341_private), GFP_KERNEL); |
267 | if (!priv) | |
268 | return -ENOMEM; | |
269 | ||
664d5df9 | 270 | spin_lock_init(&priv->lock); |
6ce76104 | 271 | priv->baud_rate = DEFAULT_BAUD_RATE; |
6ce76104 | 272 | |
456c5be5 | 273 | r = ch341_configure(port->serial->dev, priv); |
6ce76104 FK |
274 | if (r < 0) |
275 | goto error; | |
276 | ||
456c5be5 | 277 | usb_set_serial_port_data(port, priv); |
6ce76104 FK |
278 | return 0; |
279 | ||
280 | error: kfree(priv); | |
281 | return r; | |
282 | } | |
283 | ||
456c5be5 JH |
284 | static int ch341_port_remove(struct usb_serial_port *port) |
285 | { | |
286 | struct ch341_private *priv; | |
287 | ||
288 | priv = usb_get_serial_port_data(port); | |
289 | kfree(priv); | |
290 | ||
291 | return 0; | |
292 | } | |
293 | ||
335f8514 AC |
294 | static int ch341_carrier_raised(struct usb_serial_port *port) |
295 | { | |
296 | struct ch341_private *priv = usb_get_serial_port_data(port); | |
297 | if (priv->line_status & CH341_BIT_DCD) | |
298 | return 1; | |
299 | return 0; | |
300 | } | |
301 | ||
302 | static void ch341_dtr_rts(struct usb_serial_port *port, int on) | |
664d5df9 WC |
303 | { |
304 | struct ch341_private *priv = usb_get_serial_port_data(port); | |
305 | unsigned long flags; | |
664d5df9 | 306 | |
335f8514 AC |
307 | /* drop DTR and RTS */ |
308 | spin_lock_irqsave(&priv->lock, flags); | |
309 | if (on) | |
310 | priv->line_control |= CH341_BIT_RTS | CH341_BIT_DTR; | |
311 | else | |
312 | priv->line_control &= ~(CH341_BIT_RTS | CH341_BIT_DTR); | |
313 | spin_unlock_irqrestore(&priv->lock, flags); | |
314 | ch341_set_handshake(port->serial->dev, priv->line_control); | |
335f8514 AC |
315 | } |
316 | ||
317 | static void ch341_close(struct usb_serial_port *port) | |
318 | { | |
f26788da | 319 | usb_serial_generic_close(port); |
664d5df9 | 320 | usb_kill_urb(port->interrupt_in_urb); |
664d5df9 WC |
321 | } |
322 | ||
323 | ||
6ce76104 | 324 | /* open this device, set default parameters */ |
a509a7e4 | 325 | static int ch341_open(struct tty_struct *tty, struct usb_serial_port *port) |
6ce76104 | 326 | { |
456c5be5 | 327 | struct ch341_private *priv = usb_get_serial_port_data(port); |
6ce76104 FK |
328 | int r; |
329 | ||
aa91def4 NP |
330 | if (tty) |
331 | ch341_set_termios(tty, port, NULL); | |
6ce76104 | 332 | |
d9a38a87 | 333 | dev_dbg(&port->dev, "%s - submitting interrupt urb\n", __func__); |
664d5df9 WC |
334 | r = usb_submit_urb(port->interrupt_in_urb, GFP_KERNEL); |
335 | if (r) { | |
d9a38a87 JH |
336 | dev_err(&port->dev, "%s - failed to submit interrupt urb: %d\n", |
337 | __func__, r); | |
f2950b78 | 338 | return r; |
664d5df9 WC |
339 | } |
340 | ||
dc204ae7 JH |
341 | r = ch341_get_status(port->serial->dev, priv); |
342 | if (r < 0) { | |
343 | dev_err(&port->dev, "failed to read modem status: %d\n", r); | |
344 | goto err_kill_interrupt_urb; | |
345 | } | |
346 | ||
a509a7e4 | 347 | r = usb_serial_generic_open(tty, port); |
f2950b78 JH |
348 | if (r) |
349 | goto err_kill_interrupt_urb; | |
350 | ||
351 | return 0; | |
352 | ||
353 | err_kill_interrupt_urb: | |
354 | usb_kill_urb(port->interrupt_in_urb); | |
6ce76104 | 355 | |
f2950b78 | 356 | return r; |
6ce76104 FK |
357 | } |
358 | ||
359 | /* Old_termios contains the original termios settings and | |
360 | * tty->termios contains the new setting to be used. | |
361 | */ | |
95da310e AC |
362 | static void ch341_set_termios(struct tty_struct *tty, |
363 | struct usb_serial_port *port, struct ktermios *old_termios) | |
6ce76104 FK |
364 | { |
365 | struct ch341_private *priv = usb_get_serial_port_data(port); | |
6ce76104 | 366 | unsigned baud_rate; |
664d5df9 | 367 | unsigned long flags; |
4e46c410 AT |
368 | unsigned char ctrl; |
369 | int r; | |
370 | ||
371 | /* redundant changes may cause the chip to lose bytes */ | |
372 | if (old_termios && !tty_termios_hw_change(&tty->termios, old_termios)) | |
373 | return; | |
6ce76104 | 374 | |
6ce76104 FK |
375 | baud_rate = tty_get_baud_rate(tty); |
376 | ||
ba781bdf AT |
377 | ctrl = CH341_LCR_ENABLE_RX | CH341_LCR_ENABLE_TX; |
378 | ||
379 | switch (C_CSIZE(tty)) { | |
380 | case CS5: | |
381 | ctrl |= CH341_LCR_CS5; | |
382 | break; | |
383 | case CS6: | |
384 | ctrl |= CH341_LCR_CS6; | |
385 | break; | |
386 | case CS7: | |
387 | ctrl |= CH341_LCR_CS7; | |
388 | break; | |
389 | case CS8: | |
390 | ctrl |= CH341_LCR_CS8; | |
391 | break; | |
392 | } | |
393 | ||
394 | if (C_PARENB(tty)) { | |
395 | ctrl |= CH341_LCR_ENABLE_PAR; | |
396 | if (C_PARODD(tty) == 0) | |
397 | ctrl |= CH341_LCR_PAR_EVEN; | |
398 | if (C_CMSPAR(tty)) | |
399 | ctrl |= CH341_LCR_MARK_SPACE; | |
400 | } | |
664d5df9 | 401 | |
ba781bdf AT |
402 | if (C_CSTOPB(tty)) |
403 | ctrl |= CH341_LCR_STOP_BITS_2; | |
4e46c410 | 404 | |
664d5df9 | 405 | if (baud_rate) { |
a20047f3 JH |
406 | priv->baud_rate = baud_rate; |
407 | ||
55fa15b5 | 408 | r = ch341_set_baudrate_lcr(port->serial->dev, priv, ctrl); |
4e46c410 AT |
409 | if (r < 0 && old_termios) { |
410 | priv->baud_rate = tty_termios_baud_rate(old_termios); | |
411 | tty_termios_copy_hw(&tty->termios, old_termios); | |
3cca8624 JH |
412 | } else if (r == 0) { |
413 | priv->lcr = ctrl; | |
4e46c410 | 414 | } |
6ce76104 FK |
415 | } |
416 | ||
030ee7ae JH |
417 | spin_lock_irqsave(&priv->lock, flags); |
418 | if (C_BAUD(tty) == B0) | |
419 | priv->line_control &= ~(CH341_BIT_DTR | CH341_BIT_RTS); | |
420 | else if (old_termios && (old_termios->c_cflag & CBAUD) == B0) | |
421 | priv->line_control |= (CH341_BIT_DTR | CH341_BIT_RTS); | |
422 | spin_unlock_irqrestore(&priv->lock, flags); | |
6ce76104 | 423 | |
030ee7ae | 424 | ch341_set_handshake(port->serial->dev, priv->line_control); |
664d5df9 WC |
425 | } |
426 | ||
492896f0 TS |
427 | static void ch341_break_ctl(struct tty_struct *tty, int break_state) |
428 | { | |
429 | const uint16_t ch341_break_reg = | |
6fde8d29 | 430 | ((uint16_t) CH341_REG_LCR << 8) | CH341_REG_BREAK; |
492896f0 TS |
431 | struct usb_serial_port *port = tty->driver_data; |
432 | int r; | |
433 | uint16_t reg_contents; | |
f2b5cc83 | 434 | uint8_t *break_reg; |
492896f0 | 435 | |
f2b5cc83 | 436 | break_reg = kmalloc(2, GFP_KERNEL); |
10c642d0 | 437 | if (!break_reg) |
f2b5cc83 | 438 | return; |
f2b5cc83 | 439 | |
492896f0 | 440 | r = ch341_control_in(port->serial->dev, CH341_REQ_READ_REG, |
f2b5cc83 | 441 | ch341_break_reg, 0, break_reg, 2); |
492896f0 | 442 | if (r < 0) { |
6a9b15fe JH |
443 | dev_err(&port->dev, "%s - USB control read error (%d)\n", |
444 | __func__, r); | |
f2b5cc83 | 445 | goto out; |
492896f0 | 446 | } |
79cbeeaf GKH |
447 | dev_dbg(&port->dev, "%s - initial ch341 break register contents - reg1: %x, reg2: %x\n", |
448 | __func__, break_reg[0], break_reg[1]); | |
492896f0 | 449 | if (break_state != 0) { |
79cbeeaf | 450 | dev_dbg(&port->dev, "%s - Enter break state requested\n", __func__); |
6fde8d29 AT |
451 | break_reg[0] &= ~CH341_NBREAK_BITS; |
452 | break_reg[1] &= ~CH341_LCR_ENABLE_TX; | |
492896f0 | 453 | } else { |
79cbeeaf | 454 | dev_dbg(&port->dev, "%s - Leave break state requested\n", __func__); |
6fde8d29 AT |
455 | break_reg[0] |= CH341_NBREAK_BITS; |
456 | break_reg[1] |= CH341_LCR_ENABLE_TX; | |
492896f0 | 457 | } |
79cbeeaf GKH |
458 | dev_dbg(&port->dev, "%s - New ch341 break register contents - reg1: %x, reg2: %x\n", |
459 | __func__, break_reg[0], break_reg[1]); | |
5be796f0 | 460 | reg_contents = get_unaligned_le16(break_reg); |
492896f0 TS |
461 | r = ch341_control_out(port->serial->dev, CH341_REQ_WRITE_REG, |
462 | ch341_break_reg, reg_contents); | |
463 | if (r < 0) | |
6a9b15fe JH |
464 | dev_err(&port->dev, "%s - USB control write error (%d)\n", |
465 | __func__, r); | |
f2b5cc83 JH |
466 | out: |
467 | kfree(break_reg); | |
492896f0 TS |
468 | } |
469 | ||
20b9d177 | 470 | static int ch341_tiocmset(struct tty_struct *tty, |
664d5df9 WC |
471 | unsigned int set, unsigned int clear) |
472 | { | |
473 | struct usb_serial_port *port = tty->driver_data; | |
474 | struct ch341_private *priv = usb_get_serial_port_data(port); | |
475 | unsigned long flags; | |
476 | u8 control; | |
477 | ||
478 | spin_lock_irqsave(&priv->lock, flags); | |
479 | if (set & TIOCM_RTS) | |
480 | priv->line_control |= CH341_BIT_RTS; | |
481 | if (set & TIOCM_DTR) | |
482 | priv->line_control |= CH341_BIT_DTR; | |
483 | if (clear & TIOCM_RTS) | |
484 | priv->line_control &= ~CH341_BIT_RTS; | |
485 | if (clear & TIOCM_DTR) | |
486 | priv->line_control &= ~CH341_BIT_DTR; | |
487 | control = priv->line_control; | |
488 | spin_unlock_irqrestore(&priv->lock, flags); | |
489 | ||
490 | return ch341_set_handshake(port->serial->dev, control); | |
491 | } | |
492 | ||
ac035628 JH |
493 | static void ch341_update_line_status(struct usb_serial_port *port, |
494 | unsigned char *data, size_t len) | |
495 | { | |
496 | struct ch341_private *priv = usb_get_serial_port_data(port); | |
b770081f | 497 | struct tty_struct *tty; |
ac035628 | 498 | unsigned long flags; |
b770081f JH |
499 | u8 status; |
500 | u8 delta; | |
ac035628 JH |
501 | |
502 | if (len < 4) | |
503 | return; | |
504 | ||
b770081f JH |
505 | status = ~data[2] & CH341_BITS_MODEM_STAT; |
506 | ||
ac035628 | 507 | spin_lock_irqsave(&priv->lock, flags); |
b770081f JH |
508 | delta = status ^ priv->line_status; |
509 | priv->line_status = status; | |
ac035628 JH |
510 | spin_unlock_irqrestore(&priv->lock, flags); |
511 | ||
fd74b0b1 JH |
512 | if (data[1] & CH341_MULT_STAT) |
513 | dev_dbg(&port->dev, "%s - multiple status change\n", __func__); | |
514 | ||
d984fe91 JH |
515 | if (!delta) |
516 | return; | |
517 | ||
5e409a26 JH |
518 | if (delta & CH341_BIT_CTS) |
519 | port->icount.cts++; | |
520 | if (delta & CH341_BIT_DSR) | |
521 | port->icount.dsr++; | |
522 | if (delta & CH341_BIT_RI) | |
523 | port->icount.rng++; | |
b770081f | 524 | if (delta & CH341_BIT_DCD) { |
5e409a26 | 525 | port->icount.dcd++; |
b770081f JH |
526 | tty = tty_port_tty_get(&port->port); |
527 | if (tty) { | |
ac035628 | 528 | usb_serial_handle_dcd_change(port, tty, |
b770081f JH |
529 | status & CH341_BIT_DCD); |
530 | tty_kref_put(tty); | |
531 | } | |
ac035628 JH |
532 | } |
533 | ||
534 | wake_up_interruptible(&port->port.delta_msr_wait); | |
535 | } | |
536 | ||
664d5df9 WC |
537 | static void ch341_read_int_callback(struct urb *urb) |
538 | { | |
271ec2d2 | 539 | struct usb_serial_port *port = urb->context; |
664d5df9 | 540 | unsigned char *data = urb->transfer_buffer; |
271ec2d2 | 541 | unsigned int len = urb->actual_length; |
664d5df9 WC |
542 | int status; |
543 | ||
664d5df9 WC |
544 | switch (urb->status) { |
545 | case 0: | |
546 | /* success */ | |
547 | break; | |
548 | case -ECONNRESET: | |
549 | case -ENOENT: | |
550 | case -ESHUTDOWN: | |
551 | /* this urb is terminated, clean up */ | |
271ec2d2 | 552 | dev_dbg(&urb->dev->dev, "%s - urb shutting down: %d\n", |
79cbeeaf | 553 | __func__, urb->status); |
664d5df9 WC |
554 | return; |
555 | default: | |
271ec2d2 | 556 | dev_dbg(&urb->dev->dev, "%s - nonzero urb status: %d\n", |
79cbeeaf | 557 | __func__, urb->status); |
664d5df9 WC |
558 | goto exit; |
559 | } | |
560 | ||
271ec2d2 JH |
561 | usb_serial_debug_data(&port->dev, __func__, len, data); |
562 | ch341_update_line_status(port, data, len); | |
664d5df9 WC |
563 | exit: |
564 | status = usb_submit_urb(urb, GFP_ATOMIC); | |
271ec2d2 JH |
565 | if (status) { |
566 | dev_err(&urb->dev->dev, "%s - usb_submit_urb failed: %d\n", | |
664d5df9 | 567 | __func__, status); |
271ec2d2 | 568 | } |
664d5df9 WC |
569 | } |
570 | ||
60b33c13 | 571 | static int ch341_tiocmget(struct tty_struct *tty) |
664d5df9 WC |
572 | { |
573 | struct usb_serial_port *port = tty->driver_data; | |
574 | struct ch341_private *priv = usb_get_serial_port_data(port); | |
575 | unsigned long flags; | |
576 | u8 mcr; | |
577 | u8 status; | |
578 | unsigned int result; | |
579 | ||
664d5df9 WC |
580 | spin_lock_irqsave(&priv->lock, flags); |
581 | mcr = priv->line_control; | |
582 | status = priv->line_status; | |
583 | spin_unlock_irqrestore(&priv->lock, flags); | |
584 | ||
585 | result = ((mcr & CH341_BIT_DTR) ? TIOCM_DTR : 0) | |
586 | | ((mcr & CH341_BIT_RTS) ? TIOCM_RTS : 0) | |
587 | | ((status & CH341_BIT_CTS) ? TIOCM_CTS : 0) | |
588 | | ((status & CH341_BIT_DSR) ? TIOCM_DSR : 0) | |
589 | | ((status & CH341_BIT_RI) ? TIOCM_RI : 0) | |
590 | | ((status & CH341_BIT_DCD) ? TIOCM_CD : 0); | |
591 | ||
79cbeeaf | 592 | dev_dbg(&port->dev, "%s - result = %x\n", __func__, result); |
73f59308 | 593 | |
664d5df9 | 594 | return result; |
6ce76104 FK |
595 | } |
596 | ||
622b80cf | 597 | static int ch341_reset_resume(struct usb_serial *serial) |
1ded7ea4 | 598 | { |
ce5e2928 JH |
599 | struct usb_serial_port *port = serial->port[0]; |
600 | struct ch341_private *priv = usb_get_serial_port_data(port); | |
601 | int ret; | |
1ded7ea4 | 602 | |
2bfd1c96 GKH |
603 | /* reconfigure ch341 serial port after bus-reset */ |
604 | ch341_configure(serial->dev, priv); | |
1ded7ea4 | 605 | |
ce5e2928 JH |
606 | if (tty_port_initialized(&port->port)) { |
607 | ret = usb_submit_urb(port->interrupt_in_urb, GFP_NOIO); | |
608 | if (ret) { | |
609 | dev_err(&port->dev, "failed to submit interrupt urb: %d\n", | |
610 | ret); | |
611 | return ret; | |
612 | } | |
dc204ae7 JH |
613 | |
614 | ret = ch341_get_status(port->serial->dev, priv); | |
615 | if (ret < 0) { | |
616 | dev_err(&port->dev, "failed to read modem status: %d\n", | |
617 | ret); | |
618 | } | |
ce5e2928 JH |
619 | } |
620 | ||
621 | return usb_serial_generic_resume(serial); | |
1ded7ea4 ML |
622 | } |
623 | ||
6ce76104 FK |
624 | static struct usb_serial_driver ch341_device = { |
625 | .driver = { | |
626 | .owner = THIS_MODULE, | |
627 | .name = "ch341-uart", | |
628 | }, | |
664d5df9 | 629 | .id_table = id_table, |
664d5df9 WC |
630 | .num_ports = 1, |
631 | .open = ch341_open, | |
335f8514 AC |
632 | .dtr_rts = ch341_dtr_rts, |
633 | .carrier_raised = ch341_carrier_raised, | |
664d5df9 | 634 | .close = ch341_close, |
664d5df9 | 635 | .set_termios = ch341_set_termios, |
492896f0 | 636 | .break_ctl = ch341_break_ctl, |
664d5df9 WC |
637 | .tiocmget = ch341_tiocmget, |
638 | .tiocmset = ch341_tiocmset, | |
5e409a26 | 639 | .tiocmiwait = usb_serial_generic_tiocmiwait, |
664d5df9 | 640 | .read_int_callback = ch341_read_int_callback, |
456c5be5 JH |
641 | .port_probe = ch341_port_probe, |
642 | .port_remove = ch341_port_remove, | |
1c1eaba8 | 643 | .reset_resume = ch341_reset_resume, |
6ce76104 FK |
644 | }; |
645 | ||
08a4f6bc AS |
646 | static struct usb_serial_driver * const serial_drivers[] = { |
647 | &ch341_device, NULL | |
648 | }; | |
649 | ||
68e24113 | 650 | module_usb_serial_driver(serial_drivers, id_table); |
6ce76104 | 651 | |
6ce76104 | 652 | MODULE_LICENSE("GPL"); |