Commit | Line | Data |
---|---|---|
5fd54ace | 1 | // SPDX-License-Identifier: GPL-2.0 |
6ce76104 FK |
2 | /* |
3 | * Copyright 2007, Frank A Kingswood <frank@kingswood-consulting.co.uk> | |
664d5df9 WC |
4 | * Copyright 2007, Werner Cornelius <werner@cornelius-consult.de> |
5 | * Copyright 2009, Boris Hajduk <boris@hajduk.org> | |
6ce76104 FK |
6 | * |
7 | * ch341.c implements a serial port driver for the Winchiphead CH341. | |
8 | * | |
9 | * The CH341 device can be used to implement an RS232 asynchronous | |
10 | * serial port, an IEEE-1284 parallel printer port or a memory-like | |
11 | * interface. In all cases the CH341 supports an I2C interface as well. | |
12 | * This driver only supports the asynchronous serial interface. | |
6ce76104 FK |
13 | */ |
14 | ||
15 | #include <linux/kernel.h> | |
6ce76104 FK |
16 | #include <linux/tty.h> |
17 | #include <linux/module.h> | |
5a0e3ad6 | 18 | #include <linux/slab.h> |
6ce76104 FK |
19 | #include <linux/usb.h> |
20 | #include <linux/usb/serial.h> | |
21 | #include <linux/serial.h> | |
5be796f0 | 22 | #include <asm/unaligned.h> |
6ce76104 | 23 | |
664d5df9 | 24 | #define DEFAULT_BAUD_RATE 9600 |
6ce76104 FK |
25 | #define DEFAULT_TIMEOUT 1000 |
26 | ||
664d5df9 WC |
27 | /* flags for IO-Bits */ |
28 | #define CH341_BIT_RTS (1 << 6) | |
29 | #define CH341_BIT_DTR (1 << 5) | |
30 | ||
31 | /******************************/ | |
32 | /* interrupt pipe definitions */ | |
33 | /******************************/ | |
34 | /* always 4 interrupt bytes */ | |
35 | /* first irq byte normally 0x08 */ | |
36 | /* second irq byte base 0x7d + below */ | |
37 | /* third irq byte base 0x94 + below */ | |
38 | /* fourth irq byte normally 0xee */ | |
39 | ||
40 | /* second interrupt byte */ | |
41 | #define CH341_MULT_STAT 0x04 /* multiple status since last interrupt event */ | |
42 | ||
43 | /* status returned in third interrupt answer byte, inverted in data | |
44 | from irq */ | |
45 | #define CH341_BIT_CTS 0x01 | |
46 | #define CH341_BIT_DSR 0x02 | |
47 | #define CH341_BIT_RI 0x04 | |
48 | #define CH341_BIT_DCD 0x08 | |
49 | #define CH341_BITS_MODEM_STAT 0x0f /* all bits */ | |
50 | ||
51 | /*******************************/ | |
52 | /* baudrate calculation factor */ | |
53 | /*******************************/ | |
54 | #define CH341_BAUDBASE_FACTOR 1532620800 | |
55 | #define CH341_BAUDBASE_DIVMAX 3 | |
56 | ||
492896f0 TS |
57 | /* Break support - the information used to implement this was gleaned from |
58 | * the Net/FreeBSD uchcom.c driver by Takanori Watanabe. Domo arigato. | |
59 | */ | |
60 | ||
6fde8d29 | 61 | #define CH341_REQ_READ_VERSION 0x5F |
492896f0 TS |
62 | #define CH341_REQ_WRITE_REG 0x9A |
63 | #define CH341_REQ_READ_REG 0x95 | |
6fde8d29 AT |
64 | #define CH341_REQ_SERIAL_INIT 0xA1 |
65 | #define CH341_REQ_MODEM_CTRL 0xA4 | |
66 | ||
67 | #define CH341_REG_BREAK 0x05 | |
68 | #define CH341_REG_LCR 0x18 | |
69 | #define CH341_NBREAK_BITS 0x01 | |
70 | ||
71 | #define CH341_LCR_ENABLE_RX 0x80 | |
72 | #define CH341_LCR_ENABLE_TX 0x40 | |
73 | #define CH341_LCR_MARK_SPACE 0x20 | |
74 | #define CH341_LCR_PAR_EVEN 0x10 | |
75 | #define CH341_LCR_ENABLE_PAR 0x08 | |
76 | #define CH341_LCR_STOP_BITS_2 0x04 | |
77 | #define CH341_LCR_CS8 0x03 | |
78 | #define CH341_LCR_CS7 0x02 | |
79 | #define CH341_LCR_CS6 0x01 | |
80 | #define CH341_LCR_CS5 0x00 | |
492896f0 | 81 | |
7d40d7e8 | 82 | static const struct usb_device_id id_table[] = { |
6ce76104 | 83 | { USB_DEVICE(0x4348, 0x5523) }, |
82078234 | 84 | { USB_DEVICE(0x1a86, 0x7523) }, |
d0781383 | 85 | { USB_DEVICE(0x1a86, 0x5523) }, |
6ce76104 FK |
86 | { }, |
87 | }; | |
88 | MODULE_DEVICE_TABLE(usb, id_table); | |
89 | ||
90 | struct ch341_private { | |
664d5df9 | 91 | spinlock_t lock; /* access lock */ |
664d5df9 | 92 | unsigned baud_rate; /* set baud rate */ |
beea33d4 | 93 | u8 mcr; |
e8024460 | 94 | u8 msr; |
3cca8624 | 95 | u8 lcr; |
6ce76104 FK |
96 | }; |
97 | ||
aa91def4 NP |
98 | static void ch341_set_termios(struct tty_struct *tty, |
99 | struct usb_serial_port *port, | |
100 | struct ktermios *old_termios); | |
101 | ||
6ce76104 FK |
102 | static int ch341_control_out(struct usb_device *dev, u8 request, |
103 | u16 value, u16 index) | |
104 | { | |
105 | int r; | |
79cbeeaf | 106 | |
91e0efcd JH |
107 | dev_dbg(&dev->dev, "%s - (%02x,%04x,%04x)\n", __func__, |
108 | request, value, index); | |
6ce76104 FK |
109 | |
110 | r = usb_control_msg(dev, usb_sndctrlpipe(dev, 0), request, | |
111 | USB_TYPE_VENDOR | USB_RECIP_DEVICE | USB_DIR_OUT, | |
112 | value, index, NULL, 0, DEFAULT_TIMEOUT); | |
2d5a9c72 JH |
113 | if (r < 0) |
114 | dev_err(&dev->dev, "failed to send control message: %d\n", r); | |
6ce76104 FK |
115 | |
116 | return r; | |
117 | } | |
118 | ||
119 | static int ch341_control_in(struct usb_device *dev, | |
120 | u8 request, u16 value, u16 index, | |
121 | char *buf, unsigned bufsize) | |
122 | { | |
123 | int r; | |
79cbeeaf | 124 | |
91e0efcd JH |
125 | dev_dbg(&dev->dev, "%s - (%02x,%04x,%04x,%u)\n", __func__, |
126 | request, value, index, bufsize); | |
6ce76104 FK |
127 | |
128 | r = usb_control_msg(dev, usb_rcvctrlpipe(dev, 0), request, | |
129 | USB_TYPE_VENDOR | USB_RECIP_DEVICE | USB_DIR_IN, | |
130 | value, index, buf, bufsize, DEFAULT_TIMEOUT); | |
e33eab9d | 131 | if (r < (int)bufsize) { |
2d5a9c72 JH |
132 | if (r >= 0) { |
133 | dev_err(&dev->dev, | |
134 | "short control message received (%d < %u)\n", | |
135 | r, bufsize); | |
136 | r = -EIO; | |
137 | } | |
138 | ||
139 | dev_err(&dev->dev, "failed to receive control message: %d\n", | |
140 | r); | |
141 | return r; | |
142 | } | |
143 | ||
144 | return 0; | |
6ce76104 FK |
145 | } |
146 | ||
55fa15b5 JH |
147 | static int ch341_set_baudrate_lcr(struct usb_device *dev, |
148 | struct ch341_private *priv, u8 lcr) | |
6ce76104 | 149 | { |
4e46c410 | 150 | short a; |
6ce76104 | 151 | int r; |
664d5df9 WC |
152 | unsigned long factor; |
153 | short divisor; | |
6ce76104 | 154 | |
664d5df9 | 155 | if (!priv->baud_rate) |
6ce76104 | 156 | return -EINVAL; |
664d5df9 WC |
157 | factor = (CH341_BAUDBASE_FACTOR / priv->baud_rate); |
158 | divisor = CH341_BAUDBASE_DIVMAX; | |
159 | ||
160 | while ((factor > 0xfff0) && divisor) { | |
161 | factor >>= 3; | |
162 | divisor--; | |
6ce76104 FK |
163 | } |
164 | ||
664d5df9 WC |
165 | if (factor > 0xfff0) |
166 | return -EINVAL; | |
167 | ||
168 | factor = 0x10000 - factor; | |
169 | a = (factor & 0xff00) | divisor; | |
664d5df9 | 170 | |
55fa15b5 JH |
171 | /* |
172 | * CH341A buffers data until a full endpoint-size packet (32 bytes) | |
173 | * has been received unless bit 7 is set. | |
174 | */ | |
175 | a |= BIT(7); | |
176 | ||
177 | r = ch341_control_out(dev, CH341_REQ_WRITE_REG, 0x1312, a); | |
178 | if (r) | |
179 | return r; | |
180 | ||
181 | r = ch341_control_out(dev, CH341_REQ_WRITE_REG, 0x2518, lcr); | |
182 | if (r) | |
183 | return r; | |
6ce76104 FK |
184 | |
185 | return r; | |
186 | } | |
187 | ||
664d5df9 | 188 | static int ch341_set_handshake(struct usb_device *dev, u8 control) |
6ce76104 | 189 | { |
6fde8d29 | 190 | return ch341_control_out(dev, CH341_REQ_MODEM_CTRL, ~control, 0); |
6ce76104 FK |
191 | } |
192 | ||
664d5df9 | 193 | static int ch341_get_status(struct usb_device *dev, struct ch341_private *priv) |
6ce76104 | 194 | { |
2d5a9c72 | 195 | const unsigned int size = 2; |
6ce76104 FK |
196 | char *buffer; |
197 | int r; | |
664d5df9 | 198 | unsigned long flags; |
6ce76104 | 199 | |
6ce76104 FK |
200 | buffer = kmalloc(size, GFP_KERNEL); |
201 | if (!buffer) | |
202 | return -ENOMEM; | |
203 | ||
6fde8d29 | 204 | r = ch341_control_in(dev, CH341_REQ_READ_REG, 0x0706, 0, buffer, size); |
c4d0f8cb | 205 | if (r < 0) |
6ce76104 FK |
206 | goto out; |
207 | ||
2d5a9c72 | 208 | spin_lock_irqsave(&priv->lock, flags); |
e8024460 | 209 | priv->msr = (~(*buffer)) & CH341_BITS_MODEM_STAT; |
2d5a9c72 | 210 | spin_unlock_irqrestore(&priv->lock, flags); |
6ce76104 FK |
211 | |
212 | out: kfree(buffer); | |
213 | return r; | |
214 | } | |
215 | ||
216 | /* -------------------------------------------------------------------------- */ | |
217 | ||
93b6497d | 218 | static int ch341_configure(struct usb_device *dev, struct ch341_private *priv) |
6ce76104 | 219 | { |
2d5a9c72 | 220 | const unsigned int size = 2; |
6ce76104 FK |
221 | char *buffer; |
222 | int r; | |
6ce76104 | 223 | |
6ce76104 FK |
224 | buffer = kmalloc(size, GFP_KERNEL); |
225 | if (!buffer) | |
226 | return -ENOMEM; | |
227 | ||
228 | /* expect two bytes 0x27 0x00 */ | |
6fde8d29 | 229 | r = ch341_control_in(dev, CH341_REQ_READ_VERSION, 0, 0, buffer, size); |
6ce76104 FK |
230 | if (r < 0) |
231 | goto out; | |
a98b6900 | 232 | dev_dbg(&dev->dev, "Chip version: 0x%02x\n", buffer[0]); |
6ce76104 | 233 | |
6fde8d29 | 234 | r = ch341_control_out(dev, CH341_REQ_SERIAL_INIT, 0, 0); |
6ce76104 FK |
235 | if (r < 0) |
236 | goto out; | |
237 | ||
55fa15b5 | 238 | r = ch341_set_baudrate_lcr(dev, priv, priv->lcr); |
6ce76104 FK |
239 | if (r < 0) |
240 | goto out; | |
241 | ||
beea33d4 | 242 | r = ch341_set_handshake(dev, priv->mcr); |
6ce76104 FK |
243 | |
244 | out: kfree(buffer); | |
245 | return r; | |
246 | } | |
247 | ||
456c5be5 | 248 | static int ch341_port_probe(struct usb_serial_port *port) |
6ce76104 FK |
249 | { |
250 | struct ch341_private *priv; | |
251 | int r; | |
252 | ||
6ce76104 FK |
253 | priv = kzalloc(sizeof(struct ch341_private), GFP_KERNEL); |
254 | if (!priv) | |
255 | return -ENOMEM; | |
256 | ||
664d5df9 | 257 | spin_lock_init(&priv->lock); |
6ce76104 | 258 | priv->baud_rate = DEFAULT_BAUD_RATE; |
7c61b0d5 JH |
259 | /* |
260 | * Some CH340 devices appear unable to change the initial LCR | |
261 | * settings, so set a sane 8N1 default. | |
262 | */ | |
263 | priv->lcr = CH341_LCR_ENABLE_RX | CH341_LCR_ENABLE_TX | CH341_LCR_CS8; | |
6ce76104 | 264 | |
456c5be5 | 265 | r = ch341_configure(port->serial->dev, priv); |
6ce76104 FK |
266 | if (r < 0) |
267 | goto error; | |
268 | ||
456c5be5 | 269 | usb_set_serial_port_data(port, priv); |
6ce76104 FK |
270 | return 0; |
271 | ||
272 | error: kfree(priv); | |
273 | return r; | |
274 | } | |
275 | ||
456c5be5 JH |
276 | static int ch341_port_remove(struct usb_serial_port *port) |
277 | { | |
278 | struct ch341_private *priv; | |
279 | ||
280 | priv = usb_get_serial_port_data(port); | |
281 | kfree(priv); | |
282 | ||
283 | return 0; | |
284 | } | |
285 | ||
335f8514 AC |
286 | static int ch341_carrier_raised(struct usb_serial_port *port) |
287 | { | |
288 | struct ch341_private *priv = usb_get_serial_port_data(port); | |
e8024460 | 289 | if (priv->msr & CH341_BIT_DCD) |
335f8514 AC |
290 | return 1; |
291 | return 0; | |
292 | } | |
293 | ||
294 | static void ch341_dtr_rts(struct usb_serial_port *port, int on) | |
664d5df9 WC |
295 | { |
296 | struct ch341_private *priv = usb_get_serial_port_data(port); | |
297 | unsigned long flags; | |
664d5df9 | 298 | |
335f8514 AC |
299 | /* drop DTR and RTS */ |
300 | spin_lock_irqsave(&priv->lock, flags); | |
301 | if (on) | |
beea33d4 | 302 | priv->mcr |= CH341_BIT_RTS | CH341_BIT_DTR; |
335f8514 | 303 | else |
beea33d4 | 304 | priv->mcr &= ~(CH341_BIT_RTS | CH341_BIT_DTR); |
335f8514 | 305 | spin_unlock_irqrestore(&priv->lock, flags); |
beea33d4 | 306 | ch341_set_handshake(port->serial->dev, priv->mcr); |
335f8514 AC |
307 | } |
308 | ||
309 | static void ch341_close(struct usb_serial_port *port) | |
310 | { | |
f26788da | 311 | usb_serial_generic_close(port); |
664d5df9 | 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 | 318 | { |
456c5be5 | 319 | struct ch341_private *priv = usb_get_serial_port_data(port); |
6ce76104 FK |
320 | int r; |
321 | ||
aa91def4 NP |
322 | if (tty) |
323 | ch341_set_termios(tty, port, NULL); | |
6ce76104 | 324 | |
d9a38a87 | 325 | dev_dbg(&port->dev, "%s - submitting interrupt urb\n", __func__); |
664d5df9 WC |
326 | r = usb_submit_urb(port->interrupt_in_urb, GFP_KERNEL); |
327 | if (r) { | |
d9a38a87 JH |
328 | dev_err(&port->dev, "%s - failed to submit interrupt urb: %d\n", |
329 | __func__, r); | |
f2950b78 | 330 | return r; |
664d5df9 WC |
331 | } |
332 | ||
a0467a96 JH |
333 | r = ch341_get_status(port->serial->dev, priv); |
334 | if (r < 0) { | |
335 | dev_err(&port->dev, "failed to read modem status: %d\n", r); | |
336 | goto err_kill_interrupt_urb; | |
337 | } | |
338 | ||
a509a7e4 | 339 | r = usb_serial_generic_open(tty, port); |
f2950b78 JH |
340 | if (r) |
341 | goto err_kill_interrupt_urb; | |
342 | ||
343 | return 0; | |
344 | ||
345 | err_kill_interrupt_urb: | |
346 | usb_kill_urb(port->interrupt_in_urb); | |
6ce76104 | 347 | |
f2950b78 | 348 | return r; |
6ce76104 FK |
349 | } |
350 | ||
351 | /* Old_termios contains the original termios settings and | |
352 | * tty->termios contains the new setting to be used. | |
353 | */ | |
95da310e AC |
354 | static void ch341_set_termios(struct tty_struct *tty, |
355 | struct usb_serial_port *port, struct ktermios *old_termios) | |
6ce76104 FK |
356 | { |
357 | struct ch341_private *priv = usb_get_serial_port_data(port); | |
6ce76104 | 358 | unsigned baud_rate; |
664d5df9 | 359 | unsigned long flags; |
448b6dc5 | 360 | u8 lcr; |
4e46c410 AT |
361 | int r; |
362 | ||
363 | /* redundant changes may cause the chip to lose bytes */ | |
364 | if (old_termios && !tty_termios_hw_change(&tty->termios, old_termios)) | |
365 | return; | |
6ce76104 | 366 | |
6ce76104 FK |
367 | baud_rate = tty_get_baud_rate(tty); |
368 | ||
448b6dc5 | 369 | lcr = CH341_LCR_ENABLE_RX | CH341_LCR_ENABLE_TX; |
ba781bdf AT |
370 | |
371 | switch (C_CSIZE(tty)) { | |
372 | case CS5: | |
448b6dc5 | 373 | lcr |= CH341_LCR_CS5; |
ba781bdf AT |
374 | break; |
375 | case CS6: | |
448b6dc5 | 376 | lcr |= CH341_LCR_CS6; |
ba781bdf AT |
377 | break; |
378 | case CS7: | |
448b6dc5 | 379 | lcr |= CH341_LCR_CS7; |
ba781bdf AT |
380 | break; |
381 | case CS8: | |
448b6dc5 | 382 | lcr |= CH341_LCR_CS8; |
ba781bdf AT |
383 | break; |
384 | } | |
385 | ||
386 | if (C_PARENB(tty)) { | |
448b6dc5 | 387 | lcr |= CH341_LCR_ENABLE_PAR; |
ba781bdf | 388 | if (C_PARODD(tty) == 0) |
448b6dc5 | 389 | lcr |= CH341_LCR_PAR_EVEN; |
ba781bdf | 390 | if (C_CMSPAR(tty)) |
448b6dc5 | 391 | lcr |= CH341_LCR_MARK_SPACE; |
ba781bdf | 392 | } |
664d5df9 | 393 | |
ba781bdf | 394 | if (C_CSTOPB(tty)) |
448b6dc5 | 395 | lcr |= CH341_LCR_STOP_BITS_2; |
4e46c410 | 396 | |
664d5df9 | 397 | if (baud_rate) { |
a20047f3 JH |
398 | priv->baud_rate = baud_rate; |
399 | ||
448b6dc5 | 400 | r = ch341_set_baudrate_lcr(port->serial->dev, priv, lcr); |
4e46c410 AT |
401 | if (r < 0 && old_termios) { |
402 | priv->baud_rate = tty_termios_baud_rate(old_termios); | |
403 | tty_termios_copy_hw(&tty->termios, old_termios); | |
3cca8624 | 404 | } else if (r == 0) { |
448b6dc5 | 405 | priv->lcr = lcr; |
4e46c410 | 406 | } |
6ce76104 FK |
407 | } |
408 | ||
030ee7ae JH |
409 | spin_lock_irqsave(&priv->lock, flags); |
410 | if (C_BAUD(tty) == B0) | |
beea33d4 | 411 | priv->mcr &= ~(CH341_BIT_DTR | CH341_BIT_RTS); |
030ee7ae | 412 | else if (old_termios && (old_termios->c_cflag & CBAUD) == B0) |
beea33d4 | 413 | priv->mcr |= (CH341_BIT_DTR | CH341_BIT_RTS); |
030ee7ae | 414 | spin_unlock_irqrestore(&priv->lock, flags); |
6ce76104 | 415 | |
beea33d4 | 416 | ch341_set_handshake(port->serial->dev, priv->mcr); |
664d5df9 WC |
417 | } |
418 | ||
492896f0 TS |
419 | static void ch341_break_ctl(struct tty_struct *tty, int break_state) |
420 | { | |
421 | const uint16_t ch341_break_reg = | |
6fde8d29 | 422 | ((uint16_t) CH341_REG_LCR << 8) | CH341_REG_BREAK; |
492896f0 TS |
423 | struct usb_serial_port *port = tty->driver_data; |
424 | int r; | |
425 | uint16_t reg_contents; | |
f2b5cc83 | 426 | uint8_t *break_reg; |
492896f0 | 427 | |
f2b5cc83 | 428 | break_reg = kmalloc(2, GFP_KERNEL); |
10c642d0 | 429 | if (!break_reg) |
f2b5cc83 | 430 | return; |
f2b5cc83 | 431 | |
492896f0 | 432 | r = ch341_control_in(port->serial->dev, CH341_REQ_READ_REG, |
f2b5cc83 | 433 | ch341_break_reg, 0, break_reg, 2); |
492896f0 | 434 | if (r < 0) { |
6a9b15fe JH |
435 | dev_err(&port->dev, "%s - USB control read error (%d)\n", |
436 | __func__, r); | |
f2b5cc83 | 437 | goto out; |
492896f0 | 438 | } |
79cbeeaf GKH |
439 | dev_dbg(&port->dev, "%s - initial ch341 break register contents - reg1: %x, reg2: %x\n", |
440 | __func__, break_reg[0], break_reg[1]); | |
492896f0 | 441 | if (break_state != 0) { |
79cbeeaf | 442 | dev_dbg(&port->dev, "%s - Enter break state requested\n", __func__); |
6fde8d29 AT |
443 | break_reg[0] &= ~CH341_NBREAK_BITS; |
444 | break_reg[1] &= ~CH341_LCR_ENABLE_TX; | |
492896f0 | 445 | } else { |
79cbeeaf | 446 | dev_dbg(&port->dev, "%s - Leave break state requested\n", __func__); |
6fde8d29 AT |
447 | break_reg[0] |= CH341_NBREAK_BITS; |
448 | break_reg[1] |= CH341_LCR_ENABLE_TX; | |
492896f0 | 449 | } |
79cbeeaf GKH |
450 | dev_dbg(&port->dev, "%s - New ch341 break register contents - reg1: %x, reg2: %x\n", |
451 | __func__, break_reg[0], break_reg[1]); | |
5be796f0 | 452 | reg_contents = get_unaligned_le16(break_reg); |
492896f0 TS |
453 | r = ch341_control_out(port->serial->dev, CH341_REQ_WRITE_REG, |
454 | ch341_break_reg, reg_contents); | |
455 | if (r < 0) | |
6a9b15fe JH |
456 | dev_err(&port->dev, "%s - USB control write error (%d)\n", |
457 | __func__, r); | |
f2b5cc83 JH |
458 | out: |
459 | kfree(break_reg); | |
492896f0 TS |
460 | } |
461 | ||
20b9d177 | 462 | static int ch341_tiocmset(struct tty_struct *tty, |
664d5df9 WC |
463 | unsigned int set, unsigned int clear) |
464 | { | |
465 | struct usb_serial_port *port = tty->driver_data; | |
466 | struct ch341_private *priv = usb_get_serial_port_data(port); | |
467 | unsigned long flags; | |
468 | u8 control; | |
469 | ||
470 | spin_lock_irqsave(&priv->lock, flags); | |
471 | if (set & TIOCM_RTS) | |
beea33d4 | 472 | priv->mcr |= CH341_BIT_RTS; |
664d5df9 | 473 | if (set & TIOCM_DTR) |
beea33d4 | 474 | priv->mcr |= CH341_BIT_DTR; |
664d5df9 | 475 | if (clear & TIOCM_RTS) |
beea33d4 | 476 | priv->mcr &= ~CH341_BIT_RTS; |
664d5df9 | 477 | if (clear & TIOCM_DTR) |
beea33d4 JH |
478 | priv->mcr &= ~CH341_BIT_DTR; |
479 | control = priv->mcr; | |
664d5df9 WC |
480 | spin_unlock_irqrestore(&priv->lock, flags); |
481 | ||
482 | return ch341_set_handshake(port->serial->dev, control); | |
483 | } | |
484 | ||
e8024460 | 485 | static void ch341_update_status(struct usb_serial_port *port, |
ac035628 JH |
486 | unsigned char *data, size_t len) |
487 | { | |
488 | struct ch341_private *priv = usb_get_serial_port_data(port); | |
b770081f | 489 | struct tty_struct *tty; |
ac035628 | 490 | unsigned long flags; |
b770081f JH |
491 | u8 status; |
492 | u8 delta; | |
ac035628 JH |
493 | |
494 | if (len < 4) | |
495 | return; | |
496 | ||
b770081f JH |
497 | status = ~data[2] & CH341_BITS_MODEM_STAT; |
498 | ||
ac035628 | 499 | spin_lock_irqsave(&priv->lock, flags); |
e8024460 JH |
500 | delta = status ^ priv->msr; |
501 | priv->msr = status; | |
ac035628 JH |
502 | spin_unlock_irqrestore(&priv->lock, flags); |
503 | ||
fd74b0b1 JH |
504 | if (data[1] & CH341_MULT_STAT) |
505 | dev_dbg(&port->dev, "%s - multiple status change\n", __func__); | |
506 | ||
d984fe91 JH |
507 | if (!delta) |
508 | return; | |
509 | ||
5e409a26 JH |
510 | if (delta & CH341_BIT_CTS) |
511 | port->icount.cts++; | |
512 | if (delta & CH341_BIT_DSR) | |
513 | port->icount.dsr++; | |
514 | if (delta & CH341_BIT_RI) | |
515 | port->icount.rng++; | |
b770081f | 516 | if (delta & CH341_BIT_DCD) { |
5e409a26 | 517 | port->icount.dcd++; |
b770081f JH |
518 | tty = tty_port_tty_get(&port->port); |
519 | if (tty) { | |
ac035628 | 520 | usb_serial_handle_dcd_change(port, tty, |
b770081f JH |
521 | status & CH341_BIT_DCD); |
522 | tty_kref_put(tty); | |
523 | } | |
ac035628 JH |
524 | } |
525 | ||
526 | wake_up_interruptible(&port->port.delta_msr_wait); | |
527 | } | |
528 | ||
664d5df9 WC |
529 | static void ch341_read_int_callback(struct urb *urb) |
530 | { | |
271ec2d2 | 531 | struct usb_serial_port *port = urb->context; |
664d5df9 | 532 | unsigned char *data = urb->transfer_buffer; |
271ec2d2 | 533 | unsigned int len = urb->actual_length; |
664d5df9 WC |
534 | int status; |
535 | ||
664d5df9 WC |
536 | switch (urb->status) { |
537 | case 0: | |
538 | /* success */ | |
539 | break; | |
540 | case -ECONNRESET: | |
541 | case -ENOENT: | |
542 | case -ESHUTDOWN: | |
543 | /* this urb is terminated, clean up */ | |
271ec2d2 | 544 | dev_dbg(&urb->dev->dev, "%s - urb shutting down: %d\n", |
79cbeeaf | 545 | __func__, urb->status); |
664d5df9 WC |
546 | return; |
547 | default: | |
271ec2d2 | 548 | dev_dbg(&urb->dev->dev, "%s - nonzero urb status: %d\n", |
79cbeeaf | 549 | __func__, urb->status); |
664d5df9 WC |
550 | goto exit; |
551 | } | |
552 | ||
271ec2d2 | 553 | usb_serial_debug_data(&port->dev, __func__, len, data); |
e8024460 | 554 | ch341_update_status(port, data, len); |
664d5df9 WC |
555 | exit: |
556 | status = usb_submit_urb(urb, GFP_ATOMIC); | |
271ec2d2 JH |
557 | if (status) { |
558 | dev_err(&urb->dev->dev, "%s - usb_submit_urb failed: %d\n", | |
664d5df9 | 559 | __func__, status); |
271ec2d2 | 560 | } |
664d5df9 WC |
561 | } |
562 | ||
60b33c13 | 563 | static int ch341_tiocmget(struct tty_struct *tty) |
664d5df9 WC |
564 | { |
565 | struct usb_serial_port *port = tty->driver_data; | |
566 | struct ch341_private *priv = usb_get_serial_port_data(port); | |
567 | unsigned long flags; | |
568 | u8 mcr; | |
569 | u8 status; | |
570 | unsigned int result; | |
571 | ||
664d5df9 | 572 | spin_lock_irqsave(&priv->lock, flags); |
beea33d4 | 573 | mcr = priv->mcr; |
e8024460 | 574 | status = priv->msr; |
664d5df9 WC |
575 | spin_unlock_irqrestore(&priv->lock, flags); |
576 | ||
577 | result = ((mcr & CH341_BIT_DTR) ? TIOCM_DTR : 0) | |
578 | | ((mcr & CH341_BIT_RTS) ? TIOCM_RTS : 0) | |
579 | | ((status & CH341_BIT_CTS) ? TIOCM_CTS : 0) | |
580 | | ((status & CH341_BIT_DSR) ? TIOCM_DSR : 0) | |
581 | | ((status & CH341_BIT_RI) ? TIOCM_RI : 0) | |
582 | | ((status & CH341_BIT_DCD) ? TIOCM_CD : 0); | |
583 | ||
79cbeeaf | 584 | dev_dbg(&port->dev, "%s - result = %x\n", __func__, result); |
73f59308 | 585 | |
664d5df9 | 586 | return result; |
6ce76104 FK |
587 | } |
588 | ||
622b80cf | 589 | static int ch341_reset_resume(struct usb_serial *serial) |
1ded7ea4 | 590 | { |
ce5e2928 JH |
591 | struct usb_serial_port *port = serial->port[0]; |
592 | struct ch341_private *priv = usb_get_serial_port_data(port); | |
593 | int ret; | |
1ded7ea4 | 594 | |
2bfd1c96 GKH |
595 | /* reconfigure ch341 serial port after bus-reset */ |
596 | ch341_configure(serial->dev, priv); | |
1ded7ea4 | 597 | |
ce5e2928 JH |
598 | if (tty_port_initialized(&port->port)) { |
599 | ret = usb_submit_urb(port->interrupt_in_urb, GFP_NOIO); | |
600 | if (ret) { | |
601 | dev_err(&port->dev, "failed to submit interrupt urb: %d\n", | |
602 | ret); | |
603 | return ret; | |
604 | } | |
a0467a96 JH |
605 | |
606 | ret = ch341_get_status(port->serial->dev, priv); | |
607 | if (ret < 0) { | |
608 | dev_err(&port->dev, "failed to read modem status: %d\n", | |
609 | ret); | |
610 | } | |
ce5e2928 JH |
611 | } |
612 | ||
613 | return usb_serial_generic_resume(serial); | |
1ded7ea4 ML |
614 | } |
615 | ||
6ce76104 FK |
616 | static struct usb_serial_driver ch341_device = { |
617 | .driver = { | |
618 | .owner = THIS_MODULE, | |
619 | .name = "ch341-uart", | |
620 | }, | |
664d5df9 | 621 | .id_table = id_table, |
664d5df9 WC |
622 | .num_ports = 1, |
623 | .open = ch341_open, | |
335f8514 AC |
624 | .dtr_rts = ch341_dtr_rts, |
625 | .carrier_raised = ch341_carrier_raised, | |
664d5df9 | 626 | .close = ch341_close, |
664d5df9 | 627 | .set_termios = ch341_set_termios, |
492896f0 | 628 | .break_ctl = ch341_break_ctl, |
664d5df9 WC |
629 | .tiocmget = ch341_tiocmget, |
630 | .tiocmset = ch341_tiocmset, | |
5e409a26 | 631 | .tiocmiwait = usb_serial_generic_tiocmiwait, |
664d5df9 | 632 | .read_int_callback = ch341_read_int_callback, |
456c5be5 JH |
633 | .port_probe = ch341_port_probe, |
634 | .port_remove = ch341_port_remove, | |
1c1eaba8 | 635 | .reset_resume = ch341_reset_resume, |
6ce76104 FK |
636 | }; |
637 | ||
08a4f6bc AS |
638 | static struct usb_serial_driver * const serial_drivers[] = { |
639 | &ch341_device, NULL | |
640 | }; | |
641 | ||
68e24113 | 642 | module_usb_serial_driver(serial_drivers, id_table); |
6ce76104 | 643 | |
627cfa89 | 644 | MODULE_LICENSE("GPL v2"); |