xref: /freebsd/sys/dev/gpio/gpioc.c (revision 6472ac3d8a86336899b6cfb789a4cd9897e3fab5)
1 /*-
2  * Copyright (c) 2009 Oleksandr Tymoshenko <gonzo@freebsd.org>
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 AND CONTRIBUTORS ``AS IS'' AND
15  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
16  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
17  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
18  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
19  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
20  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
21  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
22  * LIABILITY, 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 #include <sys/cdefs.h>
28 __FBSDID("$FreeBSD$");
29 
30 #include <sys/param.h>
31 #include <sys/systm.h>
32 #include <sys/types.h>
33 
34 #include <sys/bus.h>
35 #include <sys/conf.h>
36 #include <sys/ioccom.h>
37 #include <sys/kernel.h>
38 #include <sys/malloc.h>
39 #include <sys/module.h>
40 #include <sys/queue.h>
41 #include <machine/bus.h>
42 #include <machine/resource.h>
43 
44 #include <sys/gpio.h>
45 #include "gpio_if.h"
46 
47 #undef GPIOC_DEBUG
48 #ifdef GPIOC_DEBUG
49 #define dprintf printf
50 #else
51 #define dprintf(x, arg...)
52 #endif
53 
54 static int gpioc_probe(device_t dev);
55 static int gpioc_attach(device_t dev);
56 static int gpioc_detach(device_t dev);
57 
58 static d_ioctl_t	gpioc_ioctl;
59 
60 static struct cdevsw gpioc_cdevsw = {
61 	.d_version	= D_VERSION,
62 	.d_ioctl	= gpioc_ioctl,
63 	.d_name		= "gpioc",
64 };
65 
66 struct gpioc_softc {
67 	device_t	sc_dev;		/* gpiocX dev */
68 	device_t	sc_pdev;	/* gpioX dev */
69 	struct cdev	*sc_ctl_dev;	/* controller device */
70 	int		sc_unit;
71 };
72 
73 static int
74 gpioc_probe(device_t dev)
75 {
76 	device_set_desc(dev, "GPIO controller");
77 	return (0);
78 }
79 
80 static int
81 gpioc_attach(device_t dev)
82 {
83 	struct gpioc_softc *sc = device_get_softc(dev);
84 
85 	sc->sc_dev = dev;
86 	sc->sc_pdev = device_get_parent(dev);
87 	sc->sc_unit = device_get_unit(dev);
88 	sc->sc_ctl_dev = make_dev(&gpioc_cdevsw, sc->sc_unit,
89 	    UID_ROOT, GID_WHEEL, 0600, "gpioc%d", sc->sc_unit);
90 	if (!sc->sc_ctl_dev) {
91 		printf("Failed to create gpioc%d", sc->sc_unit);
92 		return (ENXIO);
93 	}
94 	sc->sc_ctl_dev->si_drv1 = sc;
95 
96 	return (0);
97 }
98 
99 static int
100 gpioc_detach(device_t dev)
101 {
102 	struct gpioc_softc *sc = device_get_softc(dev);
103 	int err;
104 
105 	if (sc->sc_ctl_dev);
106 		destroy_dev(sc->sc_ctl_dev);
107 
108 	if ((err = bus_generic_detach(dev)) != 0)
109 		return (err);
110 
111 	return (0);
112 }
113 
114 static int
115 gpioc_ioctl(struct cdev *cdev, u_long cmd, caddr_t arg, int fflag,
116     struct thread *td)
117 {
118 	int max_pin, res;
119 	struct gpioc_softc *sc = cdev->si_drv1;
120 	struct gpio_pin pin;
121 	struct gpio_req req;
122 
123 	switch (cmd) {
124 		case GPIOMAXPIN:
125 			max_pin = -1;
126 			res = GPIO_PIN_MAX(sc->sc_pdev, &max_pin);
127 			bcopy(&max_pin, arg, sizeof(max_pin));
128 			break;
129 		case GPIOGETCONFIG:
130 			bcopy(arg, &pin, sizeof(pin));
131 			dprintf("get config pin %d\n", pin.gp_pin);
132 			res = GPIO_PIN_GETFLAGS(sc->sc_pdev, pin.gp_pin,
133 			    &pin.gp_flags);
134 			/* Fail early */
135 			if (res)
136 				break;
137 			GPIO_PIN_GETCAPS(sc->sc_pdev, pin.gp_pin, &pin.gp_caps);
138 			GPIO_PIN_GETNAME(sc->sc_pdev, pin.gp_pin, pin.gp_name);
139 			bcopy(&pin, arg, sizeof(pin));
140 			break;
141 		case GPIOSETCONFIG:
142 			bcopy(arg, &pin, sizeof(pin));
143 			dprintf("set config pin %d\n", pin.gp_pin);
144 			res = GPIO_PIN_SETFLAGS(sc->sc_pdev, pin.gp_pin,
145 			    pin.gp_flags);
146 			break;
147 		case GPIOGET:
148 			bcopy(arg, &req, sizeof(req));
149 			res = GPIO_PIN_GET(sc->sc_pdev, req.gp_pin,
150 			    &req.gp_value);
151 			dprintf("read pin %d -> %d\n",
152 			    req.gp_pin, req.gp_value);
153 			bcopy(&req, arg, sizeof(req));
154 			break;
155 		case GPIOSET:
156 			bcopy(arg, &req, sizeof(req));
157 			res = GPIO_PIN_SET(sc->sc_pdev, req.gp_pin,
158 			    req.gp_value);
159 			dprintf("write pin %d -> %d\n",
160 			    req.gp_pin, req.gp_value);
161 			break;
162 		case GPIOTOGGLE:
163 			bcopy(arg, &req, sizeof(req));
164 			dprintf("toggle pin %d\n",
165 			    req.gp_pin);
166 			res = GPIO_PIN_TOGGLE(sc->sc_pdev, req.gp_pin);
167 			break;
168 		default:
169 			return (ENOTTY);
170 			break;
171 	}
172 
173 	return (res);
174 }
175 
176 static device_method_t gpioc_methods[] = {
177 	/* Device interface */
178 	DEVMETHOD(device_probe,		gpioc_probe),
179 	DEVMETHOD(device_attach,	gpioc_attach),
180 	DEVMETHOD(device_detach,	gpioc_detach),
181 	DEVMETHOD(device_shutdown,	bus_generic_shutdown),
182 	DEVMETHOD(device_suspend,	bus_generic_suspend),
183 	DEVMETHOD(device_resume,	bus_generic_resume),
184 
185 	{ 0, 0 }
186 };
187 
188 driver_t gpioc_driver = {
189 	"gpioc",
190 	gpioc_methods,
191 	sizeof(struct gpioc_softc)
192 };
193 
194 devclass_t	gpioc_devclass;
195 
196 DRIVER_MODULE(gpioc, gpio, gpioc_driver, gpioc_devclass, 0, 0);
197 MODULE_VERSION(gpioc, 1);
198