1/*
2 * esp32 / esp-idf gpio
3 *
4 * Copyright (C) 2019 - 2020 Andy Green <andy@warmcat.com>
5 *
6 * Permission is hereby granted, free of charge, to any person obtaining a copy
7 * of this software and associated documentation files (the "Software"), to
8 * deal in the Software without restriction, including without limitation the
9 * rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
10 * sell copies of the Software, and to permit persons to whom the Software is
11 * furnished to do so, subject to the following conditions:
12 *
13 * The above copyright notice and this permission notice shall be included in
14 * all copies or substantial portions of the Software.
15 *
16 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
17 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
18 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
19 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
20 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
21 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
22 * IN THE SOFTWARE.
23 */
24
25#include <libwebsockets.h>
26
27static void
28lws_gpio_esp32_mode(_lws_plat_gpio_t gpio, int flags)
29{
30	int mode, pup = GPIO_FLOATING;
31
32	switch (flags & (LWSGGPIO_FL_READ | LWSGGPIO_FL_WRITE)) {
33	default:
34		lwsl_err("%s: neither read nor write\n", __func__);
35		return;
36	case LWSGGPIO_FL_READ:
37		mode = GPIO_MODE_INPUT;
38		break;
39	case LWSGGPIO_FL_WRITE:
40		mode = GPIO_MODE_OUTPUT;
41		break;
42	case LWSGGPIO_FL_READ | LWSGGPIO_FL_WRITE:
43		mode = GPIO_MODE_INPUT_OUTPUT;
44		break;
45	}
46
47	switch (flags & (LWSGGPIO_FL_PULLUP | LWSGGPIO_FL_PULLDOWN)) {
48	default:
49		break;
50	case LWSGGPIO_FL_PULLUP:
51		pup = GPIO_PULLUP_ONLY;
52		break;
53	case LWSGGPIO_FL_PULLDOWN:
54		pup = GPIO_PULLDOWN_ONLY;
55		break;
56	case LWSGGPIO_FL_PULLUP | LWSGGPIO_FL_PULLDOWN:
57		pup = GPIO_PULLUP_PULLDOWN;
58		break;
59	}
60
61	gpio_reset_pin(gpio);
62	gpio_set_direction(gpio, mode);
63	gpio_set_pull_mode(gpio, pup);
64	gpio_set_level(gpio, flags & LWSGGPIO_FL_START_LOW ? 0 : 1);
65}
66
67static int
68lws_gpio_esp32_read(_lws_plat_gpio_t gpio)
69{
70	return gpio_get_level(gpio);
71}
72static void
73lws_gpio_esp32_set(_lws_plat_gpio_t gpio, int val)
74{
75	gpio_set_level(gpio, val);
76}
77
78static int
79lws_gpio_esp32_irq_mode(_lws_plat_gpio_t gpio, lws_gpio_irq_t irq_type,
80			lws_gpio_irq_cb_t cb, void *arg)
81{
82	if (gpio_set_intr_type(gpio, irq_type))
83		return 1;
84
85	if (cb)
86		return gpio_isr_handler_add(gpio, cb, arg);
87
88	return gpio_isr_handler_remove(gpio);
89}
90
91const lws_gpio_ops_t lws_gpio_plat = {
92	.mode			= lws_gpio_esp32_mode,
93	.read			= lws_gpio_esp32_read,
94	.set			= lws_gpio_esp32_set,
95	.irq_mode		= lws_gpio_esp32_irq_mode,
96};
97