gpioc.c revision 278786 
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: stable/10/sys/dev/gpio/gpioc.c 278786 2015-02-14 21:16:19Z loos $");
29
30#include <sys/param.h>
31#include <sys/systm.h>
32#include <sys/bus.h>
33#include <sys/conf.h>
34#include <sys/gpio.h>
35#include <sys/ioccom.h>
36#include <sys/kernel.h>
37#include <sys/malloc.h>
38#include <sys/module.h>
39
40#include <dev/gpio/gpiobusvar.h>
41
42#include "gpio_if.h"
43
44#undef GPIOC_DEBUG
45#ifdef GPIOC_DEBUG
46#define dprintf printf
47#else
48#define dprintf(x, arg...)
49#endif
50
51static int gpioc_probe(device_t dev);
52static int gpioc_attach(device_t dev);
53static int gpioc_detach(device_t dev);
54
55static d_ioctl_t	gpioc_ioctl;
56
57static struct cdevsw gpioc_cdevsw = {
58	.d_version	= D_VERSION,
59	.d_ioctl	= gpioc_ioctl,
60	.d_name		= "gpioc",
61};
62
63struct gpioc_softc {
64	device_t	sc_dev;		/* gpiocX dev */
65	device_t	sc_pdev;	/* gpioX dev */
66	struct cdev	*sc_ctl_dev;	/* controller device */
67	int		sc_unit;
68};
69
70static int
71gpioc_probe(device_t dev)
72{
73	device_set_desc(dev, "GPIO controller");
74	return (0);
75}
76
77static int
78gpioc_attach(device_t dev)
79{
80	struct gpioc_softc *sc = device_get_softc(dev);
81
82	sc->sc_dev = dev;
83	sc->sc_pdev = device_get_parent(dev);
84	sc->sc_unit = device_get_unit(dev);
85	sc->sc_ctl_dev = make_dev(&gpioc_cdevsw, sc->sc_unit,
86	    UID_ROOT, GID_WHEEL, 0600, "gpioc%d", sc->sc_unit);
87	if (!sc->sc_ctl_dev) {
88		printf("Failed to create gpioc%d", sc->sc_unit);
89		return (ENXIO);
90	}
91	sc->sc_ctl_dev->si_drv1 = sc;
92
93	return (0);
94}
95
96static int
97gpioc_detach(device_t dev)
98{
99	struct gpioc_softc *sc = device_get_softc(dev);
100	int err;
101
102	if (sc->sc_ctl_dev)
103		destroy_dev(sc->sc_ctl_dev);
104
105	if ((err = bus_generic_detach(dev)) != 0)
106		return (err);
107
108	return (0);
109}
110
111static int
112gpioc_ioctl(struct cdev *cdev, u_long cmd, caddr_t arg, int fflag,
113    struct thread *td)
114{
115	int max_pin, res;
116	struct gpioc_softc *sc = cdev->si_drv1;
117	struct gpio_pin pin;
118	struct gpio_req req;
119	uint32_t caps;
120
121	switch (cmd) {
122		case GPIOMAXPIN:
123			max_pin = -1;
124			res = GPIO_PIN_MAX(sc->sc_pdev, &max_pin);
125			bcopy(&max_pin, arg, sizeof(max_pin));
126			break;
127		case GPIOGETCONFIG:
128			bcopy(arg, &pin, sizeof(pin));
129			dprintf("get config pin %d\n", pin.gp_pin);
130			res = GPIO_PIN_GETFLAGS(sc->sc_pdev, pin.gp_pin,
131			    &pin.gp_flags);
132			/* Fail early */
133			if (res)
134				break;
135			GPIO_PIN_GETCAPS(sc->sc_pdev, pin.gp_pin, &pin.gp_caps);
136			GPIO_PIN_GETNAME(sc->sc_pdev, pin.gp_pin, pin.gp_name);
137			bcopy(&pin, arg, sizeof(pin));
138			break;
139		case GPIOSETCONFIG:
140			bcopy(arg, &pin, sizeof(pin));
141			dprintf("set config pin %d\n", pin.gp_pin);
142			res = GPIO_PIN_GETCAPS(sc->sc_pdev, pin.gp_pin, &caps);
143			if (res == 0)
144				res = gpio_check_flags(caps, pin.gp_flags);
145			if (res == 0)
146				res = GPIO_PIN_SETFLAGS(sc->sc_pdev, pin.gp_pin,
147				    pin.gp_flags);
148			break;
149		case GPIOGET:
150			bcopy(arg, &req, sizeof(req));
151			res = GPIO_PIN_GET(sc->sc_pdev, req.gp_pin,
152			    &req.gp_value);
153			dprintf("read pin %d -> %d\n",
154			    req.gp_pin, req.gp_value);
155			bcopy(&req, arg, sizeof(req));
156			break;
157		case GPIOSET:
158			bcopy(arg, &req, sizeof(req));
159			res = GPIO_PIN_SET(sc->sc_pdev, req.gp_pin,
160			    req.gp_value);
161			dprintf("write pin %d -> %d\n",
162			    req.gp_pin, req.gp_value);
163			break;
164		case GPIOTOGGLE:
165			bcopy(arg, &req, sizeof(req));
166			dprintf("toggle pin %d\n",
167			    req.gp_pin);
168			res = GPIO_PIN_TOGGLE(sc->sc_pdev, req.gp_pin);
169			break;
170		default:
171			return (ENOTTY);
172			break;
173	}
174
175	return (res);
176}
177
178static device_method_t gpioc_methods[] = {
179	/* Device interface */
180	DEVMETHOD(device_probe,		gpioc_probe),
181	DEVMETHOD(device_attach,	gpioc_attach),
182	DEVMETHOD(device_detach,	gpioc_detach),
183	DEVMETHOD(device_shutdown,	bus_generic_shutdown),
184	DEVMETHOD(device_suspend,	bus_generic_suspend),
185	DEVMETHOD(device_resume,	bus_generic_resume),
186
187	{ 0, 0 }
188};
189
190driver_t gpioc_driver = {
191	"gpioc",
192	gpioc_methods,
193	sizeof(struct gpioc_softc)
194};
195
196devclass_t	gpioc_devclass;
197
198DRIVER_MODULE(gpioc, gpio, gpioc_driver, gpioc_devclass, 0, 0);
199MODULE_VERSION(gpioc, 1);
200