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1// SPDX-License-Identifier: GPL-2.0
2/*
3 * Renesas Electronics uPD78F0730 USB to serial converter driver
4 *
5 * Copyright (C) 2014,2016 Maksim Salau <maksim.salau@gmail.com>
6 *
7 * Protocol of the adaptor is described in the application note U19660EJ1V0AN00
8 * μPD78F0730 8-bit Single-Chip Microcontroller
9 * USB-to-Serial Conversion Software
10 * <https://www.renesas.com/en-eu/doc/DocumentServer/026/U19660EJ1V0AN00.pdf>
11 *
12 * The adaptor functionality is limited to the following:
13 * - data bits: 7 or 8
14 * - stop bits: 1 or 2
15 * - parity: even, odd or none
16 * - flow control: none
17 * - baud rates: 0, 2400, 4800, 9600, 19200, 38400, 57600, 115200, 153600
18 * - signals: DTR, RTS and BREAK
19 */
20
21#include <linux/module.h>
22#include <linux/slab.h>
23#include <linux/tty.h>
24#include <linux/usb.h>
25#include <linux/usb/serial.h>
26
27#define DRIVER_DESC "Renesas uPD78F0730 USB to serial converter driver"
28
29#define DRIVER_AUTHOR "Maksim Salau <maksim.salau@gmail.com>"
30
31static const struct usb_device_id id_table[] = {
32 { USB_DEVICE(0x0409, 0x0063) }, /* V850ESJX3-STICK */
33 { USB_DEVICE(0x045B, 0x0212) }, /* YRPBRL78G13, YRPBRL78G14 */
34 { USB_DEVICE(0x064B, 0x7825) }, /* Analog Devices EVAL-ADXL362Z-DB */
35 {}
36};
37
38MODULE_DEVICE_TABLE(usb, id_table);
39
40/*
41 * Each adaptor is associated with a private structure, that holds the current
42 * state of control signals (DTR, RTS and BREAK).
43 */
44struct upd78f0730_port_private {
45 struct mutex lock; /* mutex to protect line_signals */
46 u8 line_signals;
47};
48
49/* Op-codes of control commands */
50#define UPD78F0730_CMD_LINE_CONTROL 0x00
51#define UPD78F0730_CMD_SET_DTR_RTS 0x01
52#define UPD78F0730_CMD_SET_XON_XOFF_CHR 0x02
53#define UPD78F0730_CMD_OPEN_CLOSE 0x03
54#define UPD78F0730_CMD_SET_ERR_CHR 0x04
55
56/* Data sizes in UPD78F0730_CMD_LINE_CONTROL command */
57#define UPD78F0730_DATA_SIZE_7_BITS 0x00
58#define UPD78F0730_DATA_SIZE_8_BITS 0x01
59#define UPD78F0730_DATA_SIZE_MASK 0x01
60
61/* Stop-bit modes in UPD78F0730_CMD_LINE_CONTROL command */
62#define UPD78F0730_STOP_BIT_1_BIT 0x00
63#define UPD78F0730_STOP_BIT_2_BIT 0x02
64#define UPD78F0730_STOP_BIT_MASK 0x02
65
66/* Parity modes in UPD78F0730_CMD_LINE_CONTROL command */
67#define UPD78F0730_PARITY_NONE 0x00
68#define UPD78F0730_PARITY_EVEN 0x04
69#define UPD78F0730_PARITY_ODD 0x08
70#define UPD78F0730_PARITY_MASK 0x0C
71
72/* Flow control modes in UPD78F0730_CMD_LINE_CONTROL command */
73#define UPD78F0730_FLOW_CONTROL_NONE 0x00
74#define UPD78F0730_FLOW_CONTROL_HW 0x10
75#define UPD78F0730_FLOW_CONTROL_SW 0x20
76#define UPD78F0730_FLOW_CONTROL_MASK 0x30
77
78/* Control signal bits in UPD78F0730_CMD_SET_DTR_RTS command */
79#define UPD78F0730_RTS 0x01
80#define UPD78F0730_DTR 0x02
81#define UPD78F0730_BREAK 0x04
82
83/* Port modes in UPD78F0730_CMD_OPEN_CLOSE command */
84#define UPD78F0730_PORT_CLOSE 0x00
85#define UPD78F0730_PORT_OPEN 0x01
86
87/* Error character substitution modes in UPD78F0730_CMD_SET_ERR_CHR command */
88#define UPD78F0730_ERR_CHR_DISABLED 0x00
89#define UPD78F0730_ERR_CHR_ENABLED 0x01
90
91/*
92 * Declaration of command structures
93 */
94
95/* UPD78F0730_CMD_LINE_CONTROL command */
96struct upd78f0730_line_control {
97 u8 opcode;
98 __le32 baud_rate;
99 u8 params;
100} __packed;
101
102/* UPD78F0730_CMD_SET_DTR_RTS command */
103struct upd78f0730_set_dtr_rts {
104 u8 opcode;
105 u8 params;
106};
107
108/* UPD78F0730_CMD_SET_XON_OFF_CHR command */
109struct upd78f0730_set_xon_xoff_chr {
110 u8 opcode;
111 u8 xon;
112 u8 xoff;
113};
114
115/* UPD78F0730_CMD_OPEN_CLOSE command */
116struct upd78f0730_open_close {
117 u8 opcode;
118 u8 state;
119};
120
121/* UPD78F0730_CMD_SET_ERR_CHR command */
122struct upd78f0730_set_err_chr {
123 u8 opcode;
124 u8 state;
125 u8 err_char;
126};
127
128static int upd78f0730_send_ctl(struct usb_serial_port *port,
129 const void *data, int size)
130{
131 struct usb_device *usbdev = port->serial->dev;
132 void *buf;
133 int res;
134
135 if (size <= 0 || !data)
136 return -EINVAL;
137
138 buf = kmemdup(data, size, GFP_KERNEL);
139 if (!buf)
140 return -ENOMEM;
141
142 res = usb_control_msg(usbdev, usb_sndctrlpipe(usbdev, 0), 0x00,
143 USB_TYPE_VENDOR | USB_RECIP_DEVICE | USB_DIR_OUT,
144 0x0000, 0x0000, buf, size, USB_CTRL_SET_TIMEOUT);
145
146 kfree(buf);
147
148 if (res < 0) {
149 struct device *dev = &port->dev;
150
151 dev_err(dev, "failed to send control request %02x: %d\n",
152 *(u8 *)data, res);
153
154 return res;
155 }
156
157 return 0;
158}
159
160static int upd78f0730_port_probe(struct usb_serial_port *port)
161{
162 struct upd78f0730_port_private *private;
163
164 private = kzalloc(sizeof(*private), GFP_KERNEL);
165 if (!private)
166 return -ENOMEM;
167
168 mutex_init(&private->lock);
169 usb_set_serial_port_data(port, private);
170
171 return 0;
172}
173
174static void upd78f0730_port_remove(struct usb_serial_port *port)
175{
176 struct upd78f0730_port_private *private;
177
178 private = usb_get_serial_port_data(port);
179 mutex_destroy(&private->lock);
180 kfree(private);
181}
182
183static int upd78f0730_tiocmget(struct tty_struct *tty)
184{
185 struct upd78f0730_port_private *private;
186 struct usb_serial_port *port = tty->driver_data;
187 int signals;
188 int res;
189
190 private = usb_get_serial_port_data(port);
191
192 mutex_lock(&private->lock);
193 signals = private->line_signals;
194 mutex_unlock(&private->lock);
195
196 res = ((signals & UPD78F0730_DTR) ? TIOCM_DTR : 0) |
197 ((signals & UPD78F0730_RTS) ? TIOCM_RTS : 0);
198
199 dev_dbg(&port->dev, "%s - res = %x\n", __func__, res);
200
201 return res;
202}
203
204static int upd78f0730_tiocmset(struct tty_struct *tty,
205 unsigned int set, unsigned int clear)
206{
207 struct usb_serial_port *port = tty->driver_data;
208 struct upd78f0730_port_private *private;
209 struct upd78f0730_set_dtr_rts request;
210 struct device *dev = &port->dev;
211 int res;
212
213 private = usb_get_serial_port_data(port);
214
215 mutex_lock(&private->lock);
216 if (set & TIOCM_DTR) {
217 private->line_signals |= UPD78F0730_DTR;
218 dev_dbg(dev, "%s - set DTR\n", __func__);
219 }
220 if (set & TIOCM_RTS) {
221 private->line_signals |= UPD78F0730_RTS;
222 dev_dbg(dev, "%s - set RTS\n", __func__);
223 }
224 if (clear & TIOCM_DTR) {
225 private->line_signals &= ~UPD78F0730_DTR;
226 dev_dbg(dev, "%s - clear DTR\n", __func__);
227 }
228 if (clear & TIOCM_RTS) {
229 private->line_signals &= ~UPD78F0730_RTS;
230 dev_dbg(dev, "%s - clear RTS\n", __func__);
231 }
232 request.opcode = UPD78F0730_CMD_SET_DTR_RTS;
233 request.params = private->line_signals;
234
235 res = upd78f0730_send_ctl(port, &request, sizeof(request));
236 mutex_unlock(&private->lock);
237
238 return res;
239}
240
241static int upd78f0730_break_ctl(struct tty_struct *tty, int break_state)
242{
243 struct upd78f0730_port_private *private;
244 struct usb_serial_port *port = tty->driver_data;
245 struct upd78f0730_set_dtr_rts request;
246 struct device *dev = &port->dev;
247 int res;
248
249 private = usb_get_serial_port_data(port);
250
251 mutex_lock(&private->lock);
252 if (break_state) {
253 private->line_signals |= UPD78F0730_BREAK;
254 dev_dbg(dev, "%s - set BREAK\n", __func__);
255 } else {
256 private->line_signals &= ~UPD78F0730_BREAK;
257 dev_dbg(dev, "%s - clear BREAK\n", __func__);
258 }
259 request.opcode = UPD78F0730_CMD_SET_DTR_RTS;
260 request.params = private->line_signals;
261
262 res = upd78f0730_send_ctl(port, &request, sizeof(request));
263 mutex_unlock(&private->lock);
264
265 return res;
266}
267
268static void upd78f0730_dtr_rts(struct usb_serial_port *port, int on)
269{
270 struct tty_struct *tty = port->port.tty;
271 unsigned int set = 0;
272 unsigned int clear = 0;
273
274 if (on)
275 set = TIOCM_DTR | TIOCM_RTS;
276 else
277 clear = TIOCM_DTR | TIOCM_RTS;
278
279 upd78f0730_tiocmset(tty, set, clear);
280}
281
282static speed_t upd78f0730_get_baud_rate(struct tty_struct *tty)
283{
284 const speed_t baud_rate = tty_get_baud_rate(tty);
285 static const speed_t supported[] = {
286 0, 2400, 4800, 9600, 19200, 38400, 57600, 115200, 153600
287 };
288 int i;
289
290 for (i = ARRAY_SIZE(supported) - 1; i >= 0; i--) {
291 if (baud_rate == supported[i])
292 return baud_rate;
293 }
294
295 /* If the baud rate is not supported, switch to the default one */
296 tty_encode_baud_rate(tty, 9600, 9600);
297
298 return tty_get_baud_rate(tty);
299}
300
301static void upd78f0730_set_termios(struct tty_struct *tty,
302 struct usb_serial_port *port,
303 const struct ktermios *old_termios)
304{
305 struct device *dev = &port->dev;
306 struct upd78f0730_line_control request;
307 speed_t baud_rate;
308
309 if (old_termios && !tty_termios_hw_change(&tty->termios, old_termios))
310 return;
311
312 if (C_BAUD(tty) == B0)
313 upd78f0730_dtr_rts(port, 0);
314 else if (old_termios && (old_termios->c_cflag & CBAUD) == B0)
315 upd78f0730_dtr_rts(port, 1);
316
317 baud_rate = upd78f0730_get_baud_rate(tty);
318 request.opcode = UPD78F0730_CMD_LINE_CONTROL;
319 request.baud_rate = cpu_to_le32(baud_rate);
320 request.params = 0;
321 dev_dbg(dev, "%s - baud rate = %d\n", __func__, baud_rate);
322
323 switch (C_CSIZE(tty)) {
324 case CS7:
325 request.params |= UPD78F0730_DATA_SIZE_7_BITS;
326 dev_dbg(dev, "%s - 7 data bits\n", __func__);
327 break;
328 default:
329 tty->termios.c_cflag &= ~CSIZE;
330 tty->termios.c_cflag |= CS8;
331 dev_warn(dev, "data size is not supported, using 8 bits\n");
332 fallthrough;
333 case CS8:
334 request.params |= UPD78F0730_DATA_SIZE_8_BITS;
335 dev_dbg(dev, "%s - 8 data bits\n", __func__);
336 break;
337 }
338
339 if (C_PARENB(tty)) {
340 if (C_PARODD(tty)) {
341 request.params |= UPD78F0730_PARITY_ODD;
342 dev_dbg(dev, "%s - odd parity\n", __func__);
343 } else {
344 request.params |= UPD78F0730_PARITY_EVEN;
345 dev_dbg(dev, "%s - even parity\n", __func__);
346 }
347
348 if (C_CMSPAR(tty)) {
349 tty->termios.c_cflag &= ~CMSPAR;
350 dev_warn(dev, "MARK/SPACE parity is not supported\n");
351 }
352 } else {
353 request.params |= UPD78F0730_PARITY_NONE;
354 dev_dbg(dev, "%s - no parity\n", __func__);
355 }
356
357 if (C_CSTOPB(tty)) {
358 request.params |= UPD78F0730_STOP_BIT_2_BIT;
359 dev_dbg(dev, "%s - 2 stop bits\n", __func__);
360 } else {
361 request.params |= UPD78F0730_STOP_BIT_1_BIT;
362 dev_dbg(dev, "%s - 1 stop bit\n", __func__);
363 }
364
365 if (C_CRTSCTS(tty)) {
366 tty->termios.c_cflag &= ~CRTSCTS;
367 dev_warn(dev, "RTSCTS flow control is not supported\n");
368 }
369 if (I_IXOFF(tty) || I_IXON(tty)) {
370 tty->termios.c_iflag &= ~(IXOFF | IXON);
371 dev_warn(dev, "XON/XOFF flow control is not supported\n");
372 }
373 request.params |= UPD78F0730_FLOW_CONTROL_NONE;
374 dev_dbg(dev, "%s - no flow control\n", __func__);
375
376 upd78f0730_send_ctl(port, &request, sizeof(request));
377}
378
379static int upd78f0730_open(struct tty_struct *tty, struct usb_serial_port *port)
380{
381 static const struct upd78f0730_open_close request = {
382 .opcode = UPD78F0730_CMD_OPEN_CLOSE,
383 .state = UPD78F0730_PORT_OPEN
384 };
385 int res;
386
387 res = upd78f0730_send_ctl(port, &request, sizeof(request));
388 if (res)
389 return res;
390
391 if (tty)
392 upd78f0730_set_termios(tty, port, NULL);
393
394 return usb_serial_generic_open(tty, port);
395}
396
397static void upd78f0730_close(struct usb_serial_port *port)
398{
399 static const struct upd78f0730_open_close request = {
400 .opcode = UPD78F0730_CMD_OPEN_CLOSE,
401 .state = UPD78F0730_PORT_CLOSE
402 };
403
404 usb_serial_generic_close(port);
405 upd78f0730_send_ctl(port, &request, sizeof(request));
406}
407
408static struct usb_serial_driver upd78f0730_device = {
409 .driver = {
410 .owner = THIS_MODULE,
411 .name = "upd78f0730",
412 },
413 .id_table = id_table,
414 .num_ports = 1,
415 .port_probe = upd78f0730_port_probe,
416 .port_remove = upd78f0730_port_remove,
417 .open = upd78f0730_open,
418 .close = upd78f0730_close,
419 .set_termios = upd78f0730_set_termios,
420 .tiocmget = upd78f0730_tiocmget,
421 .tiocmset = upd78f0730_tiocmset,
422 .dtr_rts = upd78f0730_dtr_rts,
423 .break_ctl = upd78f0730_break_ctl,
424};
425
426static struct usb_serial_driver * const serial_drivers[] = {
427 &upd78f0730_device,
428 NULL
429};
430
431module_usb_serial_driver(serial_drivers, id_table);
432
433MODULE_DESCRIPTION(DRIVER_DESC);
434MODULE_AUTHOR(DRIVER_AUTHOR);
435MODULE_LICENSE("GPL v2");