gpioc.c revision 213237 
1#include <sys/cdefs.h>
2__FBSDID("$FreeBSD: head/sys/dev/gpio/gpioc.c 213237 2010-09-28 03:24:53Z gonzo $");
3
4#include <sys/param.h>
5#include <sys/systm.h>
6#include <sys/types.h>
7
8#include <sys/bus.h>
9#include <sys/conf.h>
10#include <sys/ioccom.h>
11#include <sys/kernel.h>
12#include <sys/malloc.h>
13#include <sys/module.h>
14#include <sys/queue.h>
15#include <machine/bus.h>
16#include <machine/resource.h>
17
18#include <sys/gpio.h>
19#include "gpio_if.h"
20
21#undef GPIOC_DEBUG
22#ifdef GPIOC_DEBUG
23#define dprintf printf
24#else
25#define dprintf(x, arg...)
26#endif
27
28static int gpioc_probe(device_t dev);
29static int gpioc_attach(device_t dev);
30static int gpioc_detach(device_t dev);
31
32static d_ioctl_t	gpioc_ioctl;
33
34static struct cdevsw gpioc_cdevsw = {
35	.d_version	= D_VERSION,
36	.d_ioctl	= gpioc_ioctl,
37	.d_name		= "gpioc",
38#if __FreeBSD_version >= 800039
39	.d_flags	= D_PSEUDO | D_NEEDMINOR
40#endif
41};
42
43struct gpioc_softc {
44	device_t	sc_dev;		/* gpiocX dev */
45	device_t	sc_pdev;	/* gpioX dev */
46	struct cdev	*sc_ctl_dev;	/* controller device */
47	int		sc_unit;
48};
49
50static int
51gpioc_probe(device_t dev)
52{
53	device_set_desc(dev, "GPIO controller");
54	return (0);
55}
56
57static int
58gpioc_attach(device_t dev)
59{
60	struct gpioc_softc *sc = device_get_softc(dev);
61
62	sc->sc_dev = dev;
63	sc->sc_pdev = device_get_parent(dev);
64	sc->sc_unit = device_get_unit(dev);
65	sc->sc_ctl_dev = make_dev(&gpioc_cdevsw, sc->sc_unit,
66	    UID_ROOT, GID_WHEEL, 0600, "gpioc%d", sc->sc_unit);
67	if (!sc->sc_ctl_dev) {
68		printf("Failed to create gpioc%d", sc->sc_unit);
69		return (ENXIO);
70	}
71	sc->sc_ctl_dev->si_drv1 = sc;
72
73	return (0);
74}
75
76static int
77gpioc_detach(device_t dev)
78{
79	struct gpioc_softc *sc = device_get_softc(dev);
80	int err;
81
82	if (sc->sc_ctl_dev);
83		destroy_dev(sc->sc_ctl_dev);
84
85	if ((err = bus_generic_detach(dev)) != 0)
86		return (err);
87
88	return (0);
89}
90
91static int
92gpioc_ioctl(struct cdev *cdev, u_long cmd, caddr_t arg, int fflag,
93    struct thread *td)
94{
95	int max_pin, res;
96	struct gpioc_softc *sc = cdev->si_drv1;
97	struct gpio_pin pin;
98	struct gpio_req req;
99
100	switch (cmd) {
101		case GPIOMAXPIN:
102			max_pin = -1;
103			res = GPIO_PIN_MAX(sc->sc_pdev, &max_pin);
104			bcopy(&max_pin, arg, sizeof(max_pin));
105			break;
106		case GPIOGETCONFIG:
107			bcopy(arg, &pin, sizeof(pin));
108			dprintf("get config pin %d\n", pin.gp_pin);
109			res = GPIO_PIN_GETFLAGS(sc->sc_pdev, pin.gp_pin,
110			    &pin.gp_flags);
111			/* Fail early */
112			if (res)
113				break;
114			GPIO_PIN_GETCAPS(sc->sc_pdev, pin.gp_pin, &pin.gp_caps);
115			GPIO_PIN_GETNAME(sc->sc_pdev, pin.gp_pin, pin.gp_name);
116			bcopy(&pin, arg, sizeof(pin));
117			break;
118		case GPIOSETCONFIG:
119			bcopy(arg, &pin, sizeof(pin));
120			dprintf("set config pin %d\n", pin.gp_pin);
121			res = GPIO_PIN_SETFLAGS(sc->sc_pdev, pin.gp_pin,
122			    pin.gp_flags);
123			break;
124		case GPIOGET:
125			bcopy(arg, &req, sizeof(req));
126			res = GPIO_PIN_GET(sc->sc_pdev, req.gp_pin,
127			    &req.gp_value);
128			dprintf("read pin %d -> %d\n",
129			    req.gp_pin, req.gp_value);
130			bcopy(&req, arg, sizeof(req));
131			break;
132		case GPIOSET:
133			bcopy(arg, &req, sizeof(req));
134			res = GPIO_PIN_SET(sc->sc_pdev, req.gp_pin,
135			    req.gp_value);
136			dprintf("write pin %d -> %d\n",
137			    req.gp_pin, req.gp_value);
138			break;
139		case GPIOTOGGLE:
140			bcopy(arg, &req, sizeof(req));
141			dprintf("toggle pin %d\n",
142			    req.gp_pin);
143			res = GPIO_PIN_TOGGLE(sc->sc_pdev, req.gp_pin);
144			break;
145		default:
146			return (ENOTTY);
147			break;
148	}
149
150	return (res);
151}
152
153static device_method_t gpioc_methods[] = {
154	/* Device interface */
155	DEVMETHOD(device_probe,		gpioc_probe),
156	DEVMETHOD(device_attach,	gpioc_attach),
157	DEVMETHOD(device_detach,	gpioc_detach),
158	DEVMETHOD(device_shutdown,	bus_generic_shutdown),
159	DEVMETHOD(device_suspend,	bus_generic_suspend),
160	DEVMETHOD(device_resume,	bus_generic_resume),
161
162	{ 0, 0 }
163};
164
165static driver_t gpioc_driver = {
166	"gpioc",
167	gpioc_methods,
168	sizeof(struct gpioc_softc)
169};
170
171devclass_t	gpioc_devclass;
172
173DRIVER_MODULE(gpioc, gpio, gpioc_driver, gpioc_devclass, 0, 0);
174MODULE_VERSION(gpioc, 1);
175