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gpioiic.c (256281) gpioiic.c (266105)
1/*-
2 * Copyright (c) 2009 Oleksandr Tymoshenko <gonzo@freebsd.org>
3 * Copyright (c) 2010 Luiz Otavio O Souza
4 * All rights reserved.
5 *
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions
8 * are met:

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21 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
22 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
23 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
24 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
25 * SUCH DAMAGE.
26 */
27
28#include <sys/cdefs.h>
1/*-
2 * Copyright (c) 2009 Oleksandr Tymoshenko <gonzo@freebsd.org>
3 * Copyright (c) 2010 Luiz Otavio O Souza
4 * All rights reserved.
5 *
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions
8 * are met:

--- 12 unchanged lines hidden (view full) ---

21 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
22 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
23 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
24 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
25 * SUCH DAMAGE.
26 */
27
28#include <sys/cdefs.h>
29__FBSDID("$FreeBSD: stable/10/sys/dev/gpio/gpioiic.c 228729 2011-12-20 03:25:11Z adrian $");
29__FBSDID("$FreeBSD: stable/10/sys/dev/gpio/gpioiic.c 266105 2014-05-15 01:27:53Z loos $");
30
30
31#include "opt_platform.h"
32
31#include <sys/param.h>
32#include <sys/systm.h>
33#include <sys/param.h>
34#include <sys/systm.h>
33#include <sys/bio.h>
34#include <sys/bus.h>
35#include <sys/conf.h>
36#include <sys/kernel.h>
35#include <sys/bus.h>
36#include <sys/conf.h>
37#include <sys/kernel.h>
37#include <sys/kthread.h>
38#include <sys/lock.h>
39#include <sys/malloc.h>
40#include <sys/module.h>
38#include <sys/module.h>
41#include <sys/mutex.h>
42
43#include <sys/gpio.h>
44#include "gpiobus_if.h"
45
39
40#include <sys/gpio.h>
41#include "gpiobus_if.h"
42
43#ifdef FDT
44#include <dev/ofw/ofw_bus.h>
45#include <dev/ofw/ofw_bus_subr.h>
46#include <dev/fdt/fdt_common.h>
47#endif
48
46#include <dev/iicbus/iiconf.h>
47#include <dev/iicbus/iicbus.h>
48
49#include "iicbb_if.h"
50
51#define SCL_PIN_DEFAULT 0 /* default index of SCL pin on gpiobus */
52#define SDA_PIN_DEFAULT 1
53
54struct gpioiic_softc
55{
56 device_t sc_dev;
57 device_t sc_busdev;
49#include <dev/iicbus/iiconf.h>
50#include <dev/iicbus/iicbus.h>
51
52#include "iicbb_if.h"
53
54#define SCL_PIN_DEFAULT 0 /* default index of SCL pin on gpiobus */
55#define SDA_PIN_DEFAULT 1
56
57struct gpioiic_softc
58{
59 device_t sc_dev;
60 device_t sc_busdev;
58 struct cdev *sc_leddev;
59 int scl_pin;
60 int sda_pin;
61};
62
63static int gpioiic_probe(device_t);
64static int gpioiic_attach(device_t);
65
66/* iicbb interface */

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72static int gpioiic_getscl(device_t);
73static int gpioiic_reset(device_t, u_char, u_char, u_char *);
74
75
76static int
77gpioiic_probe(device_t dev)
78{
79
61 int scl_pin;
62 int sda_pin;
63};
64
65static int gpioiic_probe(device_t);
66static int gpioiic_attach(device_t);
67
68/* iicbb interface */

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74static int gpioiic_getscl(device_t);
75static int gpioiic_reset(device_t, u_char, u_char, u_char *);
76
77
78static int
79gpioiic_probe(device_t dev)
80{
81
82#ifdef FDT
83 if (!ofw_bus_is_compatible(dev, "gpioiic"))
84 return (ENXIO);
85#endif
80 device_set_desc(dev, "GPIO I2C bit-banging driver");
86 device_set_desc(dev, "GPIO I2C bit-banging driver");
87
81 return (0);
82}
83
84static int
85gpioiic_attach(device_t dev)
86{
87 struct gpioiic_softc *sc = device_get_softc(dev);
88 device_t bitbang;
88 return (0);
89}
90
91static int
92gpioiic_attach(device_t dev)
93{
94 struct gpioiic_softc *sc = device_get_softc(dev);
95 device_t bitbang;
96#ifdef FDT
97 phandle_t node;
98 pcell_t pin;
99#endif
89
90 sc->sc_dev = dev;
91 sc->sc_busdev = device_get_parent(dev);
92 if (resource_int_value(device_get_name(dev),
93 device_get_unit(dev), "scl", &sc->scl_pin))
94 sc->scl_pin = SCL_PIN_DEFAULT;
95 if (resource_int_value(device_get_name(dev),
96 device_get_unit(dev), "sda", &sc->sda_pin))
97 sc->sda_pin = SDA_PIN_DEFAULT;
98
100
101 sc->sc_dev = dev;
102 sc->sc_busdev = device_get_parent(dev);
103 if (resource_int_value(device_get_name(dev),
104 device_get_unit(dev), "scl", &sc->scl_pin))
105 sc->scl_pin = SCL_PIN_DEFAULT;
106 if (resource_int_value(device_get_name(dev),
107 device_get_unit(dev), "sda", &sc->sda_pin))
108 sc->sda_pin = SDA_PIN_DEFAULT;
109
110#ifdef FDT
111 if ((node = ofw_bus_get_node(dev)) == -1)
112 return (ENXIO);
113 if (OF_getencprop(node, "scl", &pin, sizeof(pin)) > 0)
114 sc->scl_pin = (int)pin;
115 if (OF_getencprop(node, "sda", &pin, sizeof(pin)) > 0)
116 sc->sda_pin = (int)pin;
117#endif
118
99 /* add generic bit-banging code */
100 bitbang = device_add_child(dev, "iicbb", -1);
101 device_probe_and_attach(bitbang);
102
103 return (0);
104}
105
106/*

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134 GPIOBUS_LOCK_BUS(sc->sc_busdev);
135 GPIOBUS_RELEASE_BUS(sc->sc_busdev, sc->sc_dev);
136 GPIOBUS_UNLOCK_BUS(sc->sc_busdev);
137 break;
138 default:
139 error = EINVAL;
140 }
141
119 /* add generic bit-banging code */
120 bitbang = device_add_child(dev, "iicbb", -1);
121 device_probe_and_attach(bitbang);
122
123 return (0);
124}
125
126/*

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154 GPIOBUS_LOCK_BUS(sc->sc_busdev);
155 GPIOBUS_RELEASE_BUS(sc->sc_busdev, sc->sc_dev);
156 GPIOBUS_UNLOCK_BUS(sc->sc_busdev);
157 break;
158 default:
159 error = EINVAL;
160 }
161
142 return(error);
162 return (error);
143}
144
145static void
146gpioiic_setsda(device_t dev, int val)
147{
148 struct gpioiic_softc *sc = device_get_softc(dev);
149
150 if (val == 0) {

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209 gpioiic_reset_bus(sc->sc_dev);
210
211 GPIOBUS_RELEASE_BUS(sc->sc_busdev, sc->sc_dev);
212 GPIOBUS_UNLOCK_BUS(sc->sc_busdev);
213
214 return (IIC_ENOADDR);
215}
216
163}
164
165static void
166gpioiic_setsda(device_t dev, int val)
167{
168 struct gpioiic_softc *sc = device_get_softc(dev);
169
170 if (val == 0) {

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229 gpioiic_reset_bus(sc->sc_dev);
230
231 GPIOBUS_RELEASE_BUS(sc->sc_busdev, sc->sc_dev);
232 GPIOBUS_UNLOCK_BUS(sc->sc_busdev);
233
234 return (IIC_ENOADDR);
235}
236
237#ifdef FDT
238static phandle_t
239gpioiic_get_node(device_t bus, device_t dev)
240{
241
242 /* We only have one child, the iicbb, which needs our own node. */
243 return (ofw_bus_get_node(bus));
244}
245#endif
246
217static devclass_t gpioiic_devclass;
218
219static device_method_t gpioiic_methods[] = {
220 /* Device interface */
221 DEVMETHOD(device_probe, gpioiic_probe),
222 DEVMETHOD(device_attach, gpioiic_attach),
223 DEVMETHOD(device_detach, bus_generic_detach),
224
225 /* iicbb interface */
226 DEVMETHOD(iicbb_callback, gpioiic_callback),
227 DEVMETHOD(iicbb_setsda, gpioiic_setsda),
228 DEVMETHOD(iicbb_setscl, gpioiic_setscl),
229 DEVMETHOD(iicbb_getsda, gpioiic_getsda),
230 DEVMETHOD(iicbb_getscl, gpioiic_getscl),
231 DEVMETHOD(iicbb_reset, gpioiic_reset),
232
247static devclass_t gpioiic_devclass;
248
249static device_method_t gpioiic_methods[] = {
250 /* Device interface */
251 DEVMETHOD(device_probe, gpioiic_probe),
252 DEVMETHOD(device_attach, gpioiic_attach),
253 DEVMETHOD(device_detach, bus_generic_detach),
254
255 /* iicbb interface */
256 DEVMETHOD(iicbb_callback, gpioiic_callback),
257 DEVMETHOD(iicbb_setsda, gpioiic_setsda),
258 DEVMETHOD(iicbb_setscl, gpioiic_setscl),
259 DEVMETHOD(iicbb_getsda, gpioiic_getsda),
260 DEVMETHOD(iicbb_getscl, gpioiic_getscl),
261 DEVMETHOD(iicbb_reset, gpioiic_reset),
262
263#ifdef FDT
264 /* OFW bus interface */
265 DEVMETHOD(ofw_bus_get_node, gpioiic_get_node),
266#endif
267
233 { 0, 0 }
234};
235
236static driver_t gpioiic_driver = {
237 "gpioiic",
238 gpioiic_methods,
239 sizeof(struct gpioiic_softc),
240};
241
242DRIVER_MODULE(gpioiic, gpiobus, gpioiic_driver, gpioiic_devclass, 0, 0);
243DRIVER_MODULE(iicbb, gpioiic, iicbb_driver, iicbb_devclass, 0, 0);
244MODULE_DEPEND(gpioiic, iicbb, IICBB_MINVER, IICBB_PREFVER, IICBB_MAXVER);
245MODULE_DEPEND(gpioiic, gpiobus, 1, 1, 1);
268 { 0, 0 }
269};
270
271static driver_t gpioiic_driver = {
272 "gpioiic",
273 gpioiic_methods,
274 sizeof(struct gpioiic_softc),
275};
276
277DRIVER_MODULE(gpioiic, gpiobus, gpioiic_driver, gpioiic_devclass, 0, 0);
278DRIVER_MODULE(iicbb, gpioiic, iicbb_driver, iicbb_devclass, 0, 0);
279MODULE_DEPEND(gpioiic, iicbb, IICBB_MINVER, IICBB_PREFVER, IICBB_MAXVER);
280MODULE_DEPEND(gpioiic, gpiobus, 1, 1, 1);