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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 
27 static void
lws_gpio_esp32_mode(_lws_plat_gpio_t gpio,int flags)28 lws_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 
67 static int
lws_gpio_esp32_read(_lws_plat_gpio_t gpio)68 lws_gpio_esp32_read(_lws_plat_gpio_t gpio)
69 {
70 	return gpio_get_level(gpio);
71 }
72 static void
lws_gpio_esp32_set(_lws_plat_gpio_t gpio,int val)73 lws_gpio_esp32_set(_lws_plat_gpio_t gpio, int val)
74 {
75 	gpio_set_level(gpio, val);
76 }
77 
78 static int
lws_gpio_esp32_irq_mode(_lws_plat_gpio_t gpio,lws_gpio_irq_t irq_type,lws_gpio_irq_cb_t cb,void * arg)79 lws_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 
91 const 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