acpi_lid.c revision 1.36 
1/*	$NetBSD: acpi_lid.c,v 1.36 2010/03/05 14:00:16 jruoho Exp $	*/
2
3/*
4 * Copyright 2001, 2003 Wasabi Systems, Inc.
5 * All rights reserved.
6 *
7 * Written by Jason R. Thorpe for Wasabi Systems, Inc.
8 *
9 * Redistribution and use in source and binary forms, with or without
10 * modification, are permitted provided that the following conditions
11 * are met:
12 * 1. Redistributions of source code must retain the above copyright
13 *    notice, this list of conditions and the following disclaimer.
14 * 2. Redistributions in binary form must reproduce the above copyright
15 *    notice, this list of conditions and the following disclaimer in the
16 *    documentation and/or other materials provided with the distribution.
17 * 3. All advertising materials mentioning features or use of this software
18 *    must display the following acknowledgement:
19 *	This product includes software developed for the NetBSD Project by
20 *	Wasabi Systems, Inc.
21 * 4. The name of Wasabi Systems, Inc. may not be used to endorse
22 *    or promote products derived from this software without specific prior
23 *    written permission.
24 *
25 * THIS SOFTWARE IS PROVIDED BY WASABI SYSTEMS, INC. ``AS IS'' AND
26 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
27 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
28 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL WASABI SYSTEMS, INC
29 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
30 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
31 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
32 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
33 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
34 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
35 * POSSIBILITY OF SUCH DAMAGE.
36 */
37
38/*
39 * ACPI Lid Switch driver.
40 */
41
42#include <sys/cdefs.h>
43__KERNEL_RCSID(0, "$NetBSD: acpi_lid.c,v 1.36 2010/03/05 14:00:16 jruoho Exp $");
44
45#include <sys/param.h>
46#include <sys/device.h>
47#include <sys/module.h>
48#include <sys/systm.h>
49
50#include <dev/acpi/acpireg.h>
51#include <dev/acpi/acpivar.h>
52
53#define _COMPONENT		 ACPI_LID_COMPONENT
54ACPI_MODULE_NAME		 ("acpi_lid")
55
56struct acpilid_softc {
57	struct acpi_devnode	*sc_node;
58	struct sysmon_pswitch	 sc_smpsw;
59	uint64_t		 sc_status;
60};
61
62static const char * const lid_hid[] = {
63	"PNP0C0D",
64	NULL
65};
66
67static int	acpilid_match(device_t, cfdata_t, void *);
68static void	acpilid_attach(device_t, device_t, void *);
69static int	acpilid_detach(device_t, int);
70static void	acpilid_status_changed(void *);
71static void	acpilid_notify_handler(ACPI_HANDLE, UINT32, void *);
72static void	acpilid_wake_event(device_t, bool);
73static bool	acpilid_suspend(device_t, const pmf_qual_t *);
74
75CFATTACH_DECL_NEW(acpilid, sizeof(struct acpilid_softc),
76    acpilid_match, acpilid_attach, acpilid_detach, NULL);
77
78/*
79 * acpilid_match:
80 *
81 *	Autoconfiguration `match' routine.
82 */
83static int
84acpilid_match(device_t parent, cfdata_t match, void *aux)
85{
86	struct acpi_attach_args *aa = aux;
87
88	if (aa->aa_node->ad_type != ACPI_TYPE_DEVICE)
89		return 0;
90
91	return acpi_match_hid(aa->aa_node->ad_devinfo, lid_hid);
92}
93
94/*
95 * acpilid_attach:
96 *
97 *	Autoconfiguration `attach' routine.
98 */
99static void
100acpilid_attach(device_t parent, device_t self, void *aux)
101{
102	struct acpilid_softc *sc = device_private(self);
103	struct acpi_attach_args *aa = aux;
104	ACPI_STATUS rv;
105
106	aprint_naive(": ACPI Lid Switch\n");
107	aprint_normal(": ACPI Lid Switch\n");
108
109	sc->sc_node = aa->aa_node;
110
111	sc->sc_smpsw.smpsw_name = device_xname(self);
112	sc->sc_smpsw.smpsw_type = PSWITCH_TYPE_LID;
113
114	(void)sysmon_pswitch_register(&sc->sc_smpsw);
115	(void)pmf_device_register(self, acpilid_suspend, NULL);
116
117	rv = AcpiInstallNotifyHandler(sc->sc_node->ad_handle,
118	    ACPI_DEVICE_NOTIFY, acpilid_notify_handler, self);
119
120	if (ACPI_FAILURE(rv))
121		aprint_error_dev(self, "failed to register notify handler\n");
122}
123
124static int
125acpilid_detach(device_t self, int flags)
126{
127	struct acpilid_softc *sc = device_private(self);
128	ACPI_STATUS rv;
129
130	rv = AcpiRemoveNotifyHandler(sc->sc_node->ad_handle,
131	    ACPI_DEVICE_NOTIFY, acpilid_notify_handler);
132
133	if (ACPI_FAILURE(rv))
134		return EBUSY;
135
136	pmf_device_deregister(self);
137	sysmon_pswitch_unregister(&sc->sc_smpsw);
138
139	return 0;
140}
141
142static void
143acpilid_wake_event(device_t dv, bool enable)
144{
145	struct acpilid_softc *sc = device_private(dv);
146	ACPI_OBJECT_LIST arg;
147	ACPI_OBJECT obj[3];
148	ACPI_STATUS rv;
149
150	/*
151	 * First try to call the Device Sleep Wake control method, _DSW.
152	 * Only if this is not available, resort to to the Power State
153	 * Wake control method, _PSW, which was deprecated in ACPI 3.0.
154	 */
155	obj[0].Integer.Value = enable ? 1 : 0;
156	obj[1].Integer.Value = obj[2].Integer.Value = 0;
157	obj[0].Type = obj[1].Type = obj[2].Type = ACPI_TYPE_INTEGER;
158
159	arg.Count = 3;
160	arg.Pointer = obj;
161
162	rv = AcpiEvaluateObject(sc->sc_node->ad_handle, "_DSW", &arg, NULL);
163
164	if (ACPI_SUCCESS(rv))
165		return;
166
167	if (rv != AE_NOT_FOUND)
168		goto fail;
169
170	rv = acpi_eval_set_integer(sc->sc_node->ad_handle, "_PSW",
171	    enable ? 1 : 0);
172
173	if (ACPI_FAILURE(rv) && rv != AE_NOT_FOUND)
174		goto fail;
175
176	return;
177
178fail:
179	aprint_error_dev(dv, "unable to evaluate wake control method: %s\n",
180	    AcpiFormatException(rv));
181}
182
183/*
184 * acpilid_status_changed:
185 *
186 *	Get, and possibly display, the lid status, and take action.
187 */
188static void
189acpilid_status_changed(void *arg)
190{
191	device_t dv = arg;
192	struct acpilid_softc *sc = device_private(dv);
193	ACPI_STATUS rv;
194
195	rv = acpi_eval_integer(sc->sc_node->ad_handle, "_LID", &sc->sc_status);
196
197	if (ACPI_FAILURE(rv))
198		return;
199
200	sysmon_pswitch_event(&sc->sc_smpsw, (sc->sc_status == 0) ?
201	    PSWITCH_EVENT_PRESSED : PSWITCH_EVENT_RELEASED);
202}
203
204/*
205 * acpilid_notify_handler:
206 *
207 *	Callback from ACPI interrupt handler to notify us of an event.
208 */
209static void
210acpilid_notify_handler(ACPI_HANDLE handle, uint32_t notify, void *context)
211{
212	static const int handler = OSL_NOTIFY_HANDLER;
213	device_t dv = context;
214
215	switch (notify) {
216
217	case ACPI_NOTIFY_LidStatusChanged:
218		(void)AcpiOsExecute(handler, acpilid_status_changed, dv);
219		break;
220
221	default:
222		aprint_error_dev(dv, "unknown notify 0x%02X\n", notify);
223	}
224}
225
226static bool
227acpilid_suspend(device_t dv, const pmf_qual_t *qual)
228{
229	struct acpilid_softc *sc = device_private(dv);
230
231	acpilid_wake_event(dv, sc->sc_status == 0);
232
233	return true;
234}
235
236#ifdef _MODULE
237
238MODULE(MODULE_CLASS_DRIVER, acpilid, NULL);
239CFDRIVER_DECL(acpilid, DV_DULL, NULL);
240
241static int acpilidloc[] = { -1 };
242extern struct cfattach acpilid_ca;
243
244static struct cfparent acpiparent = {
245	"acpinodebus", NULL, DVUNIT_ANY
246};
247
248static struct cfdata acpilid_cfdata[] = {
249	{
250		.cf_name = "acpilid",
251		.cf_atname = "acpilid",
252		.cf_unit = 0,
253		.cf_fstate = FSTATE_STAR,
254		.cf_loc = acpilidloc,
255		.cf_flags = 0,
256		.cf_pspec = &acpiparent,
257	},
258
259	{ NULL }
260};
261
262static int
263acpilid_modcmd(modcmd_t cmd, void *context)
264{
265	int err;
266
267	switch (cmd) {
268
269	case MODULE_CMD_INIT:
270
271		err = config_cfdriver_attach(&acpilid_cd);
272
273		if (err != 0)
274			return err;
275
276		err = config_cfattach_attach("acpilid", &acpilid_ca);
277
278		if (err != 0) {
279			config_cfdriver_detach(&acpilid_cd);
280			return err;
281		}
282
283		err = config_cfdata_attach(acpilid_cfdata, 1);
284
285		if (err != 0) {
286			config_cfattach_detach("acpilid", &acpilid_ca);
287			config_cfdriver_detach(&acpilid_cd);
288			return err;
289		}
290
291		return 0;
292
293	case MODULE_CMD_FINI:
294
295		err = config_cfdata_detach(acpilid_cfdata);
296
297		if (err != 0)
298			return err;
299
300		config_cfattach_detach("acpilid", &acpilid_ca);
301		config_cfdriver_detach(&acpilid_cd);
302
303		return 0;
304
305	default:
306		return ENOTTY;
307	}
308}
309
310#endif	/* _MODULE */
311