1 /*-
2 * SPDX-License-Identifier: BSD-2-Clause
3 *
4 * Copyright (c) 2020 Alstom Group.
5 * Copyright (c) 2020 Semihalf.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 * notice, this list of conditions and the following disclaimer in the
14 * documentation and/or other materials provided with the distribution.
15 *
16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
17 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
19 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
20 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
21 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
22 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
23 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
24 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
25 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
26 * SUCH DAMAGE.
27 */
28
29 /*
30 * Driver for TI TCA64XX I2C GPIO expander module.
31 *
32 * This driver only supports basic functionality
33 * (interrupt handling and polarity inversion were omitted).
34 */
35
36 #include <sys/cdefs.h>
37 #include <sys/param.h>
38 #include <sys/bus.h>
39 #include <sys/gpio.h>
40 #include <sys/kernel.h>
41 #include <sys/module.h>
42 #include <sys/proc.h>
43 #include <sys/systm.h>
44 #include <sys/sysctl.h>
45
46 #include <machine/bus.h>
47
48 #include <dev/ofw/openfirm.h>
49 #include <dev/ofw/ofw_bus.h>
50 #include <dev/ofw/ofw_bus_subr.h>
51
52 #include <dev/iicbus/iicbus.h>
53 #include <dev/iicbus/iiconf.h>
54
55 #include <dev/gpio/gpiobusvar.h>
56
57 #include "gpio_if.h"
58
59 /* Base addresses of registers. LSB omitted. */
60
61 #define TCA64XX_PINS_PER_REG 8
62
63 #define TCA64XX_BIT_FROM_PIN(pin) (pin % TCA64XX_PINS_PER_REG)
64 #define TCA64XX_REG_ADDR(pin, baseaddr) (baseaddr | (pin / \
65 TCA64XX_PINS_PER_REG))
66 #define TCA64XX_PIN_CAPS (GPIO_PIN_OUTPUT | GPIO_PIN_INPUT \
67 | GPIO_PIN_PUSHPULL | GPIO_PIN_INVIN)
68
69 #define TCA6416_IN_PORT_REG 0x0
70 #define TCA6416_OUT_PORT_REG 0x2
71 #define TCA6416_POLARITY_INV_REG 0x4
72 #define TCA6416_CONF_REG 0x6
73 #define TCA6416_NUM_PINS 16
74
75 #define TCA6408_IN_PORT_REG 0x0
76 #define TCA6408_OUT_PORT_REG 0x1
77 #define TCA6408_POLARITY_INV_REG 0x2
78 #define TCA6408_CONF_REG 0x3
79 #define TCA6408_NUM_PINS 8
80
81 #ifdef DEBUG
82 #define dbg_dev_printf(dev, fmt, args...) \
83 device_printf(dev, fmt, ##args)
84 #else
85 #define dbg_dev_printf(dev, fmt, args...)
86 #endif
87
88 enum chip_type{
89 TCA6416_TYPE = 1,
90 TCA6408_TYPE
91 };
92
93 struct tca64xx_softc {
94 device_t dev;
95 device_t busdev;
96 enum chip_type chip;
97 struct mtx mtx;
98 uint32_t addr;
99 uint8_t num_pins;
100 uint8_t in_port_reg;
101 uint8_t out_port_reg;
102 uint8_t polarity_inv_reg;
103 uint8_t conf_reg;
104 uint8_t pin_caps;
105 };
106
107 static int tca64xx_read(device_t, uint8_t, uint8_t *);
108 static int tca64xx_write(device_t, uint8_t, uint8_t);
109 static int tca64xx_probe(device_t);
110 static int tca64xx_attach(device_t);
111 static int tca64xx_detach(device_t);
112 static device_t tca64xx_get_bus(device_t);
113 static int tca64xx_pin_max(device_t, int *);
114 static int tca64xx_pin_getcaps(device_t, uint32_t, uint32_t *);
115 static int tca64xx_pin_getflags(device_t, uint32_t, uint32_t *);
116 static int tca64xx_pin_setflags(device_t, uint32_t, uint32_t);
117 static int tca64xx_pin_getname(device_t, uint32_t, char *);
118 static int tca64xx_pin_get(device_t, uint32_t, unsigned int *);
119 static int tca64xx_pin_set(device_t, uint32_t, unsigned int);
120 static int tca64xx_pin_toggle(device_t, uint32_t);
121 #ifdef DEBUG
122 static void tca6408_regdump_setup(device_t dev);
123 static void tca6416_regdump_setup(device_t dev);
124 static int tca64xx_regdump_sysctl(SYSCTL_HANDLER_ARGS);
125 #endif
126
127 static device_method_t tca64xx_methods[] = {
128 DEVMETHOD(device_probe, tca64xx_probe),
129 DEVMETHOD(device_attach, tca64xx_attach),
130 DEVMETHOD(device_detach, tca64xx_detach),
131
132 /* GPIO methods */
133 DEVMETHOD(gpio_get_bus, tca64xx_get_bus),
134 DEVMETHOD(gpio_pin_max, tca64xx_pin_max),
135 DEVMETHOD(gpio_pin_getcaps, tca64xx_pin_getcaps),
136 DEVMETHOD(gpio_pin_getflags, tca64xx_pin_getflags),
137 DEVMETHOD(gpio_pin_setflags, tca64xx_pin_setflags),
138 DEVMETHOD(gpio_pin_getname, tca64xx_pin_getname),
139 DEVMETHOD(gpio_pin_get, tca64xx_pin_get),
140 DEVMETHOD(gpio_pin_set, tca64xx_pin_set),
141 DEVMETHOD(gpio_pin_toggle, tca64xx_pin_toggle),
142
143 DEVMETHOD_END
144 };
145
146 static driver_t tca64xx_driver = {
147 "gpio",
148 tca64xx_methods,
149 sizeof(struct tca64xx_softc)
150 };
151
152 DRIVER_MODULE(tca64xx, iicbus, tca64xx_driver, 0, 0);
153 MODULE_VERSION(tca64xx, 1);
154
155 static struct ofw_compat_data compat_data[] = {
156 {"nxp,pca9555", TCA6416_TYPE},
157 {"ti,tca6408", TCA6408_TYPE},
158 {"ti,tca6416", TCA6416_TYPE},
159 {"ti,tca9539", TCA6416_TYPE},
160 {0,0}
161 };
162
163 static int
tca64xx_read(device_t dev,uint8_t reg,uint8_t * data)164 tca64xx_read(device_t dev, uint8_t reg, uint8_t *data)
165 {
166 struct iic_msg msgs[2];
167 struct tca64xx_softc *sc;
168 int error;
169
170 sc = device_get_softc(dev);
171 if (data == NULL)
172 return (EINVAL);
173
174 msgs[0].slave = sc->addr;
175 msgs[0].flags = IIC_M_WR | IIC_M_NOSTOP;
176 msgs[0].len = 1;
177 msgs[0].buf = ®
178
179 msgs[1].slave = sc->addr;
180 msgs[1].flags = IIC_M_RD;
181 msgs[1].len = 1;
182 msgs[1].buf = data;
183
184 error = iicbus_transfer_excl(dev, msgs, 2, IIC_WAIT);
185 return (iic2errno(error));
186 }
187
188 static int
tca64xx_write(device_t dev,uint8_t reg,uint8_t val)189 tca64xx_write(device_t dev, uint8_t reg, uint8_t val)
190 {
191 struct iic_msg msg;
192 struct tca64xx_softc *sc;
193 int error;
194 uint8_t buffer[2] = {reg, val};
195
196 sc = device_get_softc(dev);
197
198 msg.slave = sc->addr;
199 msg.flags = IIC_M_WR;
200 msg.len = 2;
201 msg.buf = buffer;
202
203 error = iicbus_transfer_excl(dev, &msg, 1, IIC_WAIT);
204 return (iic2errno(error));
205 }
206
207 static int
tca64xx_probe(device_t dev)208 tca64xx_probe(device_t dev)
209 {
210 const struct ofw_compat_data *compat_ptr;
211
212 if (!ofw_bus_status_okay(dev))
213 return (ENXIO);
214
215 compat_ptr = ofw_bus_search_compatible(dev, compat_data);
216
217 switch (compat_ptr->ocd_data) {
218 case TCA6416_TYPE:
219 device_set_desc(dev, "TCA6416 I/O expander");
220 break;
221 case TCA6408_TYPE:
222 device_set_desc(dev, "TCA6408 I/O expander");
223 break;
224 default:
225 return (ENXIO);
226 }
227
228 return (BUS_PROBE_DEFAULT);
229 }
230
231 static int
tca64xx_attach(device_t dev)232 tca64xx_attach(device_t dev)
233 {
234 struct tca64xx_softc *sc;
235 const struct ofw_compat_data *compat_ptr;
236
237 sc = device_get_softc(dev);
238 compat_ptr = ofw_bus_search_compatible(dev, compat_data);
239
240 switch (compat_ptr->ocd_data) {
241 case TCA6416_TYPE:
242 sc->in_port_reg = TCA6416_IN_PORT_REG;
243 sc->out_port_reg = TCA6416_OUT_PORT_REG;
244 sc->polarity_inv_reg = TCA6416_POLARITY_INV_REG;
245 sc->conf_reg = TCA6416_CONF_REG;
246 sc->num_pins = TCA6416_NUM_PINS;
247 break;
248 case TCA6408_TYPE:
249 sc->in_port_reg = TCA6408_IN_PORT_REG;
250 sc->out_port_reg = TCA6408_OUT_PORT_REG;
251 sc->polarity_inv_reg = TCA6408_POLARITY_INV_REG;
252 sc->conf_reg = TCA6408_CONF_REG;
253 sc->num_pins = TCA6408_NUM_PINS;
254 break;
255 default:
256 __assert_unreachable();
257 }
258
259 sc->pin_caps = TCA64XX_PIN_CAPS;
260 sc->chip = compat_ptr->ocd_data;
261 sc->dev = dev;
262 sc->addr = iicbus_get_addr(dev);
263
264 mtx_init(&sc->mtx, "tca64xx gpio", "gpio", MTX_DEF);
265 sc->busdev = gpiobus_attach_bus(dev);
266 if (sc->busdev == NULL) {
267 device_printf(dev, "Could not create busdev child\n");
268 return (ENXIO);
269 }
270
271 OF_device_register_xref(OF_xref_from_node(ofw_bus_get_node(dev)), dev);
272
273 #ifdef DEBUG
274 switch (sc->chip) {
275 case TCA6416_TYPE:
276 tca6416_regdump_setup(dev);
277 break;
278 case TCA6408_TYPE:
279 tca6408_regdump_setup(dev);
280 break;
281 default:
282 __assert_unreachable();
283 }
284 #endif
285
286 return (0);
287 }
288
289 static int
tca64xx_detach(device_t dev)290 tca64xx_detach(device_t dev)
291 {
292 struct tca64xx_softc *sc;
293
294 sc = device_get_softc(dev);
295
296 if (sc->busdev != NULL)
297 gpiobus_detach_bus(sc->busdev);
298
299 mtx_destroy(&sc->mtx);
300
301 return (0);
302 }
303
304 static device_t
tca64xx_get_bus(device_t dev)305 tca64xx_get_bus(device_t dev)
306 {
307 struct tca64xx_softc *sc;
308
309 sc = device_get_softc(dev);
310
311 return (sc->busdev);
312 }
313
314 static int
tca64xx_pin_max(device_t dev __unused,int * maxpin)315 tca64xx_pin_max(device_t dev __unused, int *maxpin)
316 {
317 struct tca64xx_softc *sc;
318
319 sc = device_get_softc(dev);
320
321 if (maxpin == NULL)
322 return (EINVAL);
323
324 *maxpin = sc->num_pins-1;
325
326 return (0);
327 }
328
329 static int
tca64xx_pin_getcaps(device_t dev,uint32_t pin,uint32_t * caps)330 tca64xx_pin_getcaps(device_t dev, uint32_t pin, uint32_t *caps)
331 {
332 struct tca64xx_softc *sc;
333
334 sc = device_get_softc(dev);
335
336 if (pin >= sc->num_pins || caps == NULL)
337 return (EINVAL);
338 *caps = sc->pin_caps;
339
340 return (0);
341 }
342
343 static int
tca64xx_pin_getflags(device_t dev,uint32_t pin,uint32_t * pflags)344 tca64xx_pin_getflags(device_t dev, uint32_t pin, uint32_t *pflags)
345 {
346 int error;
347 uint8_t bit, val, addr;
348 struct tca64xx_softc *sc;
349
350 sc = device_get_softc(dev);
351
352 bit = TCA64XX_BIT_FROM_PIN(pin);
353
354 if (pin >= sc->num_pins || pflags == NULL)
355 return (EINVAL);
356
357 addr = TCA64XX_REG_ADDR(pin, sc->conf_reg);
358 error = tca64xx_read(dev, addr, &val);
359 if (error != 0)
360 return (error);
361
362 *pflags = (val & (1 << bit)) ? GPIO_PIN_INPUT : GPIO_PIN_OUTPUT;
363
364 addr = TCA64XX_REG_ADDR(pin, sc->polarity_inv_reg);
365 error = tca64xx_read(dev, addr, &val);
366 if (error != 0)
367 return (error);
368
369 if (val & (1 << bit))
370 *pflags |= GPIO_PIN_INVIN;
371
372 return (0);
373 }
374
375 static int
tca64xx_pin_setflags(device_t dev,uint32_t pin,uint32_t flags)376 tca64xx_pin_setflags(device_t dev, uint32_t pin, uint32_t flags)
377 {
378 uint8_t bit, val, addr, pins, inv_val;
379 int error;
380 struct tca64xx_softc *sc;
381
382 sc = device_get_softc(dev);
383
384 pins = sc->num_pins;
385 bit = TCA64XX_BIT_FROM_PIN(pin);
386
387 if (pin >= pins)
388 return (EINVAL);
389 mtx_lock(&sc->mtx);
390
391 addr = TCA64XX_REG_ADDR(pin, sc->conf_reg);
392 error = tca64xx_read(dev, addr, &val);
393 if (error != 0)
394 goto fail;
395
396 addr = TCA64XX_REG_ADDR(pin, sc->polarity_inv_reg);
397 error = tca64xx_read(dev, addr, &inv_val);
398 if (error != 0)
399 goto fail;
400
401 if (flags & GPIO_PIN_INPUT)
402 val |= (1 << bit);
403 else if (flags & GPIO_PIN_OUTPUT)
404 val &= ~(1 << bit);
405
406 if (flags & GPIO_PIN_INVIN)
407 inv_val |= (1 << bit);
408 else
409 inv_val &= ~(1 << bit);
410
411 addr = TCA64XX_REG_ADDR(pin, sc->conf_reg);
412 error = tca64xx_write(dev, addr, val);
413 if (error != 0)
414 goto fail;
415
416 addr = TCA64XX_REG_ADDR(pin, sc->polarity_inv_reg);
417 error = tca64xx_write(dev, addr, inv_val);
418
419 fail:
420 mtx_unlock(&sc->mtx);
421 return (error);
422 }
423
424 static int
tca64xx_pin_getname(device_t dev,uint32_t pin,char * name)425 tca64xx_pin_getname(device_t dev, uint32_t pin, char *name)
426 {
427 struct tca64xx_softc *sc;
428
429 sc = device_get_softc(dev);
430
431 if (pin >= sc->num_pins || name == NULL)
432 return (EINVAL);
433
434 snprintf(name, GPIOMAXNAME, "gpio_P%d%d", pin / TCA64XX_PINS_PER_REG,
435 pin % TCA64XX_PINS_PER_REG);
436
437 return (0);
438 }
439
440 static int
tca64xx_pin_get(device_t dev,uint32_t pin,unsigned int * pval)441 tca64xx_pin_get(device_t dev, uint32_t pin, unsigned int *pval)
442 {
443 uint8_t bit, addr, pins, reg_pvalue;
444 int error;
445 struct tca64xx_softc *sc;
446
447 sc = device_get_softc(dev);
448
449 pins = sc->num_pins;
450 addr = TCA64XX_REG_ADDR(pin, sc->in_port_reg);
451 bit = TCA64XX_BIT_FROM_PIN(pin);
452
453 if (pin >= pins || pval == NULL)
454 return (EINVAL);
455
456 dbg_dev_printf(dev, "Reading pin %u pvalue.", pin);
457
458 error = tca64xx_read(dev, addr, ®_pvalue);
459 if (error != 0)
460 return (error);
461 *pval = reg_pvalue & (1 << bit) ? 1 : 0;
462
463 return (0);
464 }
465
466 static int
tca64xx_pin_set(device_t dev,uint32_t pin,unsigned int val)467 tca64xx_pin_set(device_t dev, uint32_t pin, unsigned int val)
468 {
469 uint8_t bit, addr, pins, value;
470 int error;
471 struct tca64xx_softc *sc;
472
473 sc = device_get_softc(dev);
474
475 pins = sc->num_pins;
476 addr = TCA64XX_REG_ADDR(pin, sc->out_port_reg);
477 bit = TCA64XX_BIT_FROM_PIN(pin);
478
479 if (pin >= pins)
480 return (EINVAL);
481
482 dbg_dev_printf(dev, "Setting pin: %u to %u\n", pin, val);
483
484 mtx_lock(&sc->mtx);
485
486 error = tca64xx_read(dev, addr, &value);
487 if (error != 0) {
488 mtx_unlock(&sc->mtx);
489 dbg_dev_printf(dev, "Failed to read from register.\n");
490 return (error);
491 }
492
493 if (val != 0)
494 value |= (1 << bit);
495 else
496 value &= ~(1 << bit);
497
498 error = tca64xx_write(dev, addr, value);
499 if (error != 0) {
500 mtx_unlock(&sc->mtx);
501 dbg_dev_printf(dev, "Could not write to register.\n");
502 return (error);
503 }
504
505 mtx_unlock(&sc->mtx);
506
507 return (0);
508 }
509
510 static int
tca64xx_pin_toggle(device_t dev,uint32_t pin)511 tca64xx_pin_toggle(device_t dev, uint32_t pin)
512 {
513 int error;
514 uint8_t bit, addr, pins, value;
515 struct tca64xx_softc *sc;
516
517 sc = device_get_softc(dev);
518
519 pins = sc->num_pins;
520 addr = TCA64XX_REG_ADDR(pin, sc->out_port_reg);
521 bit = TCA64XX_BIT_FROM_PIN(pin);
522
523 if (pin >= pins)
524 return (EINVAL);
525
526 dbg_dev_printf(dev, "Toggling pin: %d\n", pin);
527
528 mtx_lock(&sc->mtx);
529
530 error = tca64xx_read(dev, addr, &value);
531 if (error != 0) {
532 mtx_unlock(&sc->mtx);
533 dbg_dev_printf(dev, "Cannot read from register.\n");
534 return (error);
535 }
536
537 value ^= (1 << bit);
538
539 error = tca64xx_write(dev, addr, value);
540 if (error != 0) {
541 mtx_unlock(&sc->mtx);
542 dbg_dev_printf(dev, "Cannot write to register.\n");
543 return (error);
544 }
545
546 mtx_unlock(&sc->mtx);
547
548 return (0);
549 }
550
551 #ifdef DEBUG
552 static void
tca6416_regdump_setup(device_t dev)553 tca6416_regdump_setup(device_t dev)
554 {
555 struct sysctl_ctx_list *ctx;
556 struct sysctl_oid *node;
557
558 ctx = device_get_sysctl_ctx(dev);
559 node = device_get_sysctl_tree(dev);
560
561 SYSCTL_ADD_PROC(ctx, SYSCTL_CHILDREN(node), OID_AUTO, "in_reg_1",
562 CTLTYPE_STRING | CTLFLAG_RD | CTLFLAG_MPSAFE, dev,
563 TCA6416_IN_PORT_REG, tca64xx_regdump_sysctl, "A", "Input port 1");
564 SYSCTL_ADD_PROC(ctx, SYSCTL_CHILDREN(node), OID_AUTO, "in_reg_2",
565 CTLTYPE_STRING | CTLFLAG_RD | CTLFLAG_MPSAFE, dev,
566 TCA6416_IN_PORT_REG | 1, tca64xx_regdump_sysctl, "A",
567 "Input port 2");
568 SYSCTL_ADD_PROC(ctx, SYSCTL_CHILDREN(node), OID_AUTO, "out_reg_1",
569 CTLTYPE_STRING | CTLFLAG_RD | CTLFLAG_MPSAFE, dev,
570 TCA6416_OUT_PORT_REG, tca64xx_regdump_sysctl, "A",
571 "Output port 1");
572 SYSCTL_ADD_PROC(ctx, SYSCTL_CHILDREN(node), OID_AUTO, "out_reg_2",
573 CTLTYPE_STRING | CTLFLAG_RD | CTLFLAG_MPSAFE, dev,
574 TCA6416_OUT_PORT_REG | 1, tca64xx_regdump_sysctl, "A",
575 "Output port 2");
576 SYSCTL_ADD_PROC(ctx, SYSCTL_CHILDREN(node), OID_AUTO, "pol_inv_1",
577 CTLTYPE_STRING | CTLFLAG_RD | CTLFLAG_MPSAFE, dev,
578 TCA6416_POLARITY_INV_REG, tca64xx_regdump_sysctl, "A",
579 "Polarity inv 1");
580 SYSCTL_ADD_PROC(ctx, SYSCTL_CHILDREN(node), OID_AUTO, "pol_inv_2",
581 CTLTYPE_STRING | CTLFLAG_RD | CTLFLAG_MPSAFE, dev,
582 TCA6416_POLARITY_INV_REG | 1, tca64xx_regdump_sysctl, "A",
583 "Polarity inv 2");
584 SYSCTL_ADD_PROC(ctx, SYSCTL_CHILDREN(node), OID_AUTO, "conf_reg_1",
585 CTLTYPE_STRING | CTLFLAG_RD | CTLFLAG_MPSAFE, dev,
586 TCA6416_CONF_REG, tca64xx_regdump_sysctl, "A", "Configuration 1");
587 SYSCTL_ADD_PROC(ctx, SYSCTL_CHILDREN(node), OID_AUTO, "conf_reg_2",
588 CTLTYPE_STRING | CTLFLAG_RD | CTLFLAG_MPSAFE, dev,
589 TCA6416_CONF_REG | 1, tca64xx_regdump_sysctl, "A",
590 "Configuration 2");
591 }
592
593 static void
tca6408_regdump_setup(device_t dev)594 tca6408_regdump_setup(device_t dev)
595 {
596 struct sysctl_ctx_list *ctx;
597 struct sysctl_oid *node;
598
599 ctx = device_get_sysctl_ctx(dev);
600 node = device_get_sysctl_tree(dev);
601
602 SYSCTL_ADD_PROC(ctx, SYSCTL_CHILDREN(node), OID_AUTO, "in_reg_1",
603 CTLTYPE_STRING | CTLFLAG_RD | CTLFLAG_MPSAFE, dev,
604 TCA6408_IN_PORT_REG, tca64xx_regdump_sysctl, "A", "Input port 1");
605 SYSCTL_ADD_PROC(ctx, SYSCTL_CHILDREN(node), OID_AUTO, "out_reg_1",
606 CTLTYPE_STRING | CTLFLAG_RD | CTLFLAG_MPSAFE, dev,
607 TCA6408_OUT_PORT_REG, tca64xx_regdump_sysctl, "A",
608 "Output port 1");
609 SYSCTL_ADD_PROC(ctx, SYSCTL_CHILDREN(node), OID_AUTO, "pol_inv_1",
610 CTLTYPE_STRING | CTLFLAG_RD | CTLFLAG_MPSAFE, dev,
611 TCA6408_POLARITY_INV_REG, tca64xx_regdump_sysctl,
612 "A", "Polarity inv 1");
613 SYSCTL_ADD_PROC(ctx, SYSCTL_CHILDREN(node), OID_AUTO, "conf_reg_1",
614 CTLTYPE_STRING | CTLFLAG_RD | CTLFLAG_MPSAFE, dev,
615 TCA6408_CONF_REG, tca64xx_regdump_sysctl, "A", "Configuration 1");
616 }
617
618 static int
tca64xx_regdump_sysctl(SYSCTL_HANDLER_ARGS)619 tca64xx_regdump_sysctl(SYSCTL_HANDLER_ARGS)
620 {
621 device_t dev;
622 char buf[5];
623 int len, error;
624 uint8_t reg, regval;
625
626 dev = (device_t)arg1;
627 reg = (uint8_t)arg2;
628
629 error = tca64xx_read(dev, reg, ®val);
630 if (error != 0) {
631 return (error);
632 }
633
634 len = snprintf(buf, 5, "0x%02x", regval);
635
636 error = sysctl_handle_string(oidp, buf, len, req);
637
638 return (error);
639 }
640 #endif
641