1 /*-
2 * Copyright (c) 2016 Justin Hibbits
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
13 *
14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
15 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
16 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
17 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
18 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
19 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
20 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
21 * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
22 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
24 * SUCH DAMAGE.
25 */
26
27
28 #include <sys/param.h>
29 #include <sys/systm.h>
30 #include <sys/bus.h>
31 #include <sys/eventhandler.h>
32 #include <sys/gpio.h>
33 #include <sys/kernel.h>
34 #include <sys/module.h>
35 #include <sys/reboot.h>
36
37 #include <dev/fdt/fdt_common.h>
38 #include <dev/ofw/ofw_bus.h>
39
40 #include <dev/gpio/gpiobusvar.h>
41
42 struct gpiopower_softc {
43 gpio_pin_t sc_pin;
44 int sc_rbmask;
45 int sc_hi_period;
46 int sc_lo_period;
47 int sc_timeout;
48 };
49
50 static void gpiopower_assert(device_t dev, int howto);
51
52 static int
gpiopower_probe(device_t dev)53 gpiopower_probe(device_t dev)
54 {
55
56 if (ofw_bus_is_compatible(dev, "gpio-poweroff")) {
57 device_set_desc(dev, "GPIO poweroff control");
58 return (0);
59 } else if (ofw_bus_is_compatible(dev, "gpio-restart")) {
60 device_set_desc(dev, "GPIO restart control");
61 return (0);
62 }
63
64 return (ENXIO);
65 }
66
67 static int
gpiopower_attach(device_t dev)68 gpiopower_attach(device_t dev)
69 {
70 struct gpiopower_softc *sc;
71 phandle_t node;
72 uint32_t prop;
73
74 sc = device_get_softc(dev);
75
76 if ((node = ofw_bus_get_node(dev)) == -1)
77 return (ENXIO);
78
79 if (ofw_gpiobus_parse_gpios(dev, "gpios", &sc->sc_pin) <= 0) {
80 device_printf(dev, "failed to map GPIO pin\n");
81 return (ENXIO);
82 }
83
84 if (ofw_bus_is_compatible(dev, "gpio-poweroff"))
85 sc->sc_rbmask = RB_HALT | RB_POWEROFF;
86 else
87 sc->sc_rbmask = 0;
88
89 sc->sc_hi_period = 100000;
90 sc->sc_lo_period = 100000;
91 sc->sc_timeout = 1000000;
92
93 if ((OF_getprop(node, "active-delay-ms", &prop, sizeof(prop))) > 0)
94 sc->sc_hi_period = fdt32_to_cpu(prop) * 1000;
95 if ((OF_getprop(node, "inactive-delay-ms", &prop, sizeof(prop))) > 0)
96 sc->sc_lo_period = fdt32_to_cpu(prop) * 1000;
97 if ((OF_getprop(node, "timeout-ms", &prop, sizeof(prop))) > 0)
98 sc->sc_timeout = fdt32_to_cpu(prop) * 1000;
99
100 EVENTHANDLER_REGISTER(shutdown_final, gpiopower_assert, dev,
101 SHUTDOWN_PRI_LAST);
102
103 return (0);
104 }
105
106 static void
gpiopower_assert(device_t dev,int howto)107 gpiopower_assert(device_t dev, int howto)
108 {
109 struct gpiopower_softc *sc;
110 int do_assert;
111
112 sc = device_get_softc(dev);
113 do_assert = sc->sc_rbmask ? (sc->sc_rbmask & howto) :
114 ((howto & RB_HALT) == 0);
115
116 if (!do_assert)
117 return;
118
119 if (howto & RB_POWEROFF)
120 device_printf(dev, "powering system off\n");
121 else if ((howto & RB_HALT) == 0)
122 device_printf(dev, "resetting system\n");
123 else
124 return;
125
126 gpio_pin_setflags(sc->sc_pin, GPIO_PIN_OUTPUT);
127 gpio_pin_set_active(sc->sc_pin, true);
128 DELAY(sc->sc_hi_period);
129 gpio_pin_set_active(sc->sc_pin, false);
130 DELAY(sc->sc_lo_period);
131 gpio_pin_set_active(sc->sc_pin, true);
132 DELAY(sc->sc_timeout);
133
134 device_printf(dev, "%s failed\n",
135 (howto & RB_POWEROFF) != 0 ? "power off" : "reset");
136 }
137
138 static device_method_t gpiopower_methods[] = {
139 /* Device interface */
140 DEVMETHOD(device_probe, gpiopower_probe),
141 DEVMETHOD(device_attach, gpiopower_attach),
142
143 DEVMETHOD_END
144 };
145
146 static driver_t gpiopower_driver = {
147 "gpiopower",
148 gpiopower_methods,
149 sizeof(struct gpiopower_softc)
150 };
151
152 DRIVER_MODULE(gpiopower, simplebus, gpiopower_driver, 0, 0);
153 MODULE_DEPEND(gpiopower, gpiobus, 1, 1, 1);
154