xref: /freebsd/sys/dev/acpi_support/acpi_hp.c (revision 8d20be1e22095c27faf8fe8b2f0d089739cc742e)
1 /*-
2  * Copyright (c) 2009 Michael Gmelin <freebsd@grem.de>
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 /*
31  * Driver for extra ACPI-controlled features found on HP laptops
32  * that use a WMI enabled BIOS (e.g. HP Compaq 8510p and 6510p).
33  * Allows to control and read status of integrated hardware and read
34  * BIOS settings through CMI.
35  * Inspired by the hp-wmi driver, which implements a subset of these
36  * features (hotkeys) on Linux.
37  *
38  * HP CMI whitepaper:
39  *     http://h20331.www2.hp.com/Hpsub/downloads/cmi_whitepaper.pdf
40  * wmi-hp for Linux:
41  *     http://www.kernel.org
42  * WMI and ACPI:
43  *     http://www.microsoft.com/whdc/system/pnppwr/wmi/wmi-acpi.mspx
44  */
45 
46 #include "opt_acpi.h"
47 #include <sys/param.h>
48 #include <sys/conf.h>
49 #include <sys/uio.h>
50 #include <sys/proc.h>
51 #include <sys/kernel.h>
52 #include <sys/bus.h>
53 #include <sys/sbuf.h>
54 #include <sys/module.h>
55 #include <sys/sysctl.h>
56 
57 #include <contrib/dev/acpica/include/acpi.h>
58 #include <contrib/dev/acpica/include/accommon.h>
59 #include <dev/acpica/acpivar.h>
60 #include "acpi_wmi_if.h"
61 
62 #define _COMPONENT	ACPI_OEM
63 ACPI_MODULE_NAME("HP")
64 
65 #define ACPI_HP_WMI_EVENT_GUID		"95F24279-4D7B-4334-9387-ACCDC67EF61C"
66 #define ACPI_HP_WMI_BIOS_GUID		"5FB7F034-2C63-45E9-BE91-3D44E2C707E4"
67 #define ACPI_HP_WMI_CMI_GUID		"2D114B49-2DFB-4130-B8FE-4A3C09E75133"
68 
69 #define ACPI_HP_WMI_DISPLAY_COMMAND	0x1
70 #define ACPI_HP_WMI_HDDTEMP_COMMAND	0x2
71 #define ACPI_HP_WMI_ALS_COMMAND		0x3
72 #define ACPI_HP_WMI_DOCK_COMMAND	0x4
73 #define ACPI_HP_WMI_WIRELESS_COMMAND	0x5
74 
75 #define ACPI_HP_METHOD_WLAN_ENABLED			1
76 #define ACPI_HP_METHOD_WLAN_RADIO			2
77 #define ACPI_HP_METHOD_WLAN_ON_AIR			3
78 #define ACPI_HP_METHOD_WLAN_ENABLE_IF_RADIO_ON		4
79 #define ACPI_HP_METHOD_WLAN_DISABLE_IF_RADIO_OFF	5
80 #define ACPI_HP_METHOD_BLUETOOTH_ENABLED		6
81 #define ACPI_HP_METHOD_BLUETOOTH_RADIO			7
82 #define ACPI_HP_METHOD_BLUETOOTH_ON_AIR			8
83 #define ACPI_HP_METHOD_BLUETOOTH_ENABLE_IF_RADIO_ON	9
84 #define ACPI_HP_METHOD_BLUETOOTH_DISABLE_IF_RADIO_OFF	10
85 #define ACPI_HP_METHOD_WWAN_ENABLED			11
86 #define ACPI_HP_METHOD_WWAN_RADIO			12
87 #define ACPI_HP_METHOD_WWAN_ON_AIR			13
88 #define ACPI_HP_METHOD_WWAN_ENABLE_IF_RADIO_ON		14
89 #define ACPI_HP_METHOD_WWAN_DISABLE_IF_RADIO_OFF	15
90 #define ACPI_HP_METHOD_ALS				16
91 #define ACPI_HP_METHOD_DISPLAY				17
92 #define ACPI_HP_METHOD_HDDTEMP				18
93 #define ACPI_HP_METHOD_DOCK				19
94 #define ACPI_HP_METHOD_CMI_DETAIL			20
95 #define ACPI_HP_METHOD_VERBOSE				21
96 
97 #define HP_MASK_WWAN_ON_AIR			0x1000000
98 #define HP_MASK_BLUETOOTH_ON_AIR		0x10000
99 #define HP_MASK_WLAN_ON_AIR			0x100
100 #define HP_MASK_WWAN_RADIO			0x8000000
101 #define HP_MASK_BLUETOOTH_RADIO			0x80000
102 #define HP_MASK_WLAN_RADIO			0x800
103 #define HP_MASK_WWAN_ENABLED			0x2000000
104 #define HP_MASK_BLUETOOTH_ENABLED		0x20000
105 #define HP_MASK_WLAN_ENABLED			0x200
106 
107 #define ACPI_HP_CMI_DETAIL_PATHS		0x01
108 #define ACPI_HP_CMI_DETAIL_ENUMS		0x02
109 #define ACPI_HP_CMI_DETAIL_FLAGS		0x04
110 #define ACPI_HP_CMI_DETAIL_SHOW_MAX_INSTANCE	0x08
111 
112 struct acpi_hp_inst_seq_pair {
113 	UINT32	sequence;	/* sequence number as suggested by cmi bios */
114 	UINT8	instance;	/* object instance on guid */
115 };
116 
117 struct acpi_hp_softc {
118 	device_t	dev;
119 	device_t	wmi_dev;
120 	int		has_notify;		/* notification GUID found */
121 	int		has_cmi;		/* CMI GUID found */
122 	int		cmi_detail;		/* CMI detail level
123 						   (set by sysctl) */
124 	int		verbose;		/* add debug output */
125 	int		wlan_enable_if_radio_on;	/* set by sysctl */
126 	int		wlan_disable_if_radio_off;	/* set by sysctl */
127 	int		bluetooth_enable_if_radio_on;	/* set by sysctl */
128 	int		bluetooth_disable_if_radio_off;	/* set by sysctl */
129 	int		wwan_enable_if_radio_on;	/* set by sysctl */
130 	int		wwan_disable_if_radio_off;	/* set by sysctl */
131 	int		was_wlan_on_air;		/* last known WLAN
132 							   on air status */
133 	int		was_bluetooth_on_air;		/* last known BT
134 							   on air status */
135 	int		was_wwan_on_air;		/* last known WWAN
136 							   on air status */
137 	struct sysctl_ctx_list	*sysctl_ctx;
138 	struct sysctl_oid	*sysctl_tree;
139 	struct cdev	*hpcmi_dev_t;		/* hpcmi device handle */
140 	struct sbuf	hpcmi_sbuf;		/* /dev/hpcmi output sbuf */
141 	pid_t		hpcmi_open_pid;		/* pid operating on
142 						   /dev/hpcmi */
143 	int		hpcmi_bufptr;		/* current pointer position
144 						   in /dev/hpcmi output buffer
145 						 */
146 	int		cmi_order_size;		/* size of cmi_order list */
147 	struct acpi_hp_inst_seq_pair cmi_order[128];	/* list of CMI
148 			     instances ordered by BIOS suggested sequence */
149 };
150 
151 static struct {
152 	char	*name;
153 	int	method;
154 	char	*description;
155 	int	access;
156 } acpi_hp_sysctls[] = {
157 	{
158 		.name		= "wlan_enabled",
159 		.method		= ACPI_HP_METHOD_WLAN_ENABLED,
160 		.description	= "Enable/Disable WLAN (WiFi)",
161 		.access		= CTLTYPE_INT | CTLFLAG_RW
162 	},
163 	{
164 		.name		= "wlan_radio",
165 		.method		= ACPI_HP_METHOD_WLAN_RADIO,
166 		.description	= "WLAN radio status",
167 		.access		= CTLTYPE_INT | CTLFLAG_RD
168 	},
169 	{
170 		.name		= "wlan_on_air",
171 		.method		= ACPI_HP_METHOD_WLAN_ON_AIR,
172 		.description	= "WLAN radio ready to use (enabled and radio)",
173 		.access		= CTLTYPE_INT | CTLFLAG_RD
174 	},
175 	{
176 		.name		= "wlan_enable_if_radio_on",
177 		.method		= ACPI_HP_METHOD_WLAN_ENABLE_IF_RADIO_ON,
178 		.description	= "Enable WLAN if radio is turned on",
179 		.access		= CTLTYPE_INT | CTLFLAG_RW
180 	},
181 	{
182 		.name		= "wlan_disable_if_radio_off",
183 		.method		= ACPI_HP_METHOD_WLAN_DISABLE_IF_RADIO_OFF,
184 		.description	= "Disable WLAN if radio is turned off",
185 		.access		= CTLTYPE_INT | CTLFLAG_RW
186 	},
187 	{
188 		.name		= "bt_enabled",
189 		.method		= ACPI_HP_METHOD_BLUETOOTH_ENABLED,
190 		.description	= "Enable/Disable Bluetooth",
191 		.access		= CTLTYPE_INT | CTLFLAG_RW
192 	},
193 	{
194 		.name		= "bt_radio",
195 		.method		= ACPI_HP_METHOD_BLUETOOTH_RADIO,
196 		.description	= "Bluetooth radio status",
197 		.access		= CTLTYPE_INT | CTLFLAG_RD
198 	},
199 	{
200 		.name		= "bt_on_air",
201 		.method		= ACPI_HP_METHOD_BLUETOOTH_ON_AIR,
202 		.description	= "Bluetooth radio ready to use"
203 				    " (enabled and radio)",
204 		.access		= CTLTYPE_INT | CTLFLAG_RD
205 	},
206 	{
207 		.name		= "bt_enable_if_radio_on",
208 		.method		= ACPI_HP_METHOD_BLUETOOTH_ENABLE_IF_RADIO_ON,
209 		.description	= "Enable bluetooth if radio is turned on",
210 		.access		= CTLTYPE_INT | CTLFLAG_RW
211 	},
212 	{
213 		.name		= "bt_disable_if_radio_off",
214 		.method		= ACPI_HP_METHOD_BLUETOOTH_DISABLE_IF_RADIO_OFF,
215 		.description	= "Disable bluetooth if radio is turned off",
216 		.access		= CTLTYPE_INT | CTLFLAG_RW
217 	},
218 	{
219 		.name		= "wwan_enabled",
220 		.method		= ACPI_HP_METHOD_WWAN_ENABLED,
221 		.description	= "Enable/Disable WWAN (UMTS)",
222 		.access		= CTLTYPE_INT | CTLFLAG_RW
223 	},
224 	{
225 		.name		= "wwan_radio",
226 		.method		= ACPI_HP_METHOD_WWAN_RADIO,
227 		.description	= "WWAN radio status",
228 		.access		= CTLTYPE_INT | CTLFLAG_RD
229 	},
230 	{
231 		.name		= "wwan_on_air",
232 		.method		= ACPI_HP_METHOD_WWAN_ON_AIR,
233 		.description	= "WWAN radio ready to use (enabled and radio)",
234 		.access		= CTLTYPE_INT | CTLFLAG_RD
235 	},
236 	{
237 		.name		= "wwan_enable_if_radio_on",
238 		.method		= ACPI_HP_METHOD_WWAN_ENABLE_IF_RADIO_ON,
239 		.description	= "Enable WWAN if radio is turned on",
240 		.access		= CTLTYPE_INT | CTLFLAG_RW
241 	},
242 	{
243 		.name		= "wwan_disable_if_radio_off",
244 		.method		= ACPI_HP_METHOD_WWAN_DISABLE_IF_RADIO_OFF,
245 		.description	= "Disable WWAN if radio is turned off",
246 		.access		= CTLTYPE_INT | CTLFLAG_RW
247 	},
248 	{
249 		.name		= "als_enabled",
250 		.method		= ACPI_HP_METHOD_ALS,
251 		.description	= "Enable/Disable ALS (Ambient light sensor)",
252 		.access		= CTLTYPE_INT | CTLFLAG_RW
253 	},
254 	{
255 		.name		= "display",
256 		.method		= ACPI_HP_METHOD_DISPLAY,
257 		.description	= "Display status",
258 		.access		= CTLTYPE_INT | CTLFLAG_RD
259 	},
260 	{
261 		.name		= "hdd_temperature",
262 		.method		= ACPI_HP_METHOD_HDDTEMP,
263 		.description	= "HDD temperature",
264 		.access		= CTLTYPE_INT | CTLFLAG_RD
265 	},
266 	{
267 		.name		= "is_docked",
268 		.method		= ACPI_HP_METHOD_DOCK,
269 		.description	= "Docking station status",
270 		.access		= CTLTYPE_INT | CTLFLAG_RD
271 	},
272 	{
273 		.name		= "cmi_detail",
274 		.method		= ACPI_HP_METHOD_CMI_DETAIL,
275 		.description	= "Details shown in CMI output "
276 				    "(cat /dev/hpcmi)",
277 		.access		= CTLTYPE_INT | CTLFLAG_RW
278 	},
279 	{
280 		.name		= "verbose",
281 		.method		= ACPI_HP_METHOD_VERBOSE,
282 		.description	= "Verbosity level",
283 		.access		= CTLTYPE_INT | CTLFLAG_RW
284 	},
285 
286 	{ NULL, 0, NULL, 0 }
287 };
288 
289 ACPI_SERIAL_DECL(hp, "HP ACPI-WMI Mapping");
290 
291 static void	acpi_hp_identify(driver_t *driver, device_t parent);
292 static int	acpi_hp_probe(device_t dev);
293 static int	acpi_hp_attach(device_t dev);
294 static int	acpi_hp_detach(device_t dev);
295 
296 static void	acpi_hp_evaluate_auto_on_off(struct acpi_hp_softc* sc);
297 static int	acpi_hp_sysctl(SYSCTL_HANDLER_ARGS);
298 static int	acpi_hp_sysctl_set(struct acpi_hp_softc *sc, int method,
299 		    int arg, int oldarg);
300 static int	acpi_hp_sysctl_get(struct acpi_hp_softc *sc, int method);
301 static int	acpi_hp_exec_wmi_command(device_t wmi_dev, int command,
302 		    int is_write, int val);
303 static void	acpi_hp_notify(ACPI_HANDLE h, UINT32 notify, void *context);
304 static int	acpi_hp_get_cmi_block(device_t wmi_dev, const char* guid,
305 		    UINT8 instance, char* outbuf, size_t outsize,
306 		    UINT32* sequence, int detail);
307 static void	acpi_hp_hex_decode(char* buffer);
308 
309 static d_open_t	acpi_hp_hpcmi_open;
310 static d_close_t acpi_hp_hpcmi_close;
311 static d_read_t	acpi_hp_hpcmi_read;
312 
313 /* handler /dev/hpcmi device */
314 static struct cdevsw hpcmi_cdevsw = {
315 	.d_version = D_VERSION,
316 	.d_open = acpi_hp_hpcmi_open,
317 	.d_close = acpi_hp_hpcmi_close,
318 	.d_read = acpi_hp_hpcmi_read,
319 	.d_name = "hpcmi",
320 };
321 
322 static device_method_t acpi_hp_methods[] = {
323 	DEVMETHOD(device_identify, acpi_hp_identify),
324 	DEVMETHOD(device_probe, acpi_hp_probe),
325 	DEVMETHOD(device_attach, acpi_hp_attach),
326 	DEVMETHOD(device_detach, acpi_hp_detach),
327 
328 	DEVMETHOD_END
329 };
330 
331 static driver_t	acpi_hp_driver = {
332 	"acpi_hp",
333 	acpi_hp_methods,
334 	sizeof(struct acpi_hp_softc),
335 };
336 
337 static devclass_t acpi_hp_devclass;
338 
339 DRIVER_MODULE(acpi_hp, acpi_wmi, acpi_hp_driver, acpi_hp_devclass,
340 		0, 0);
341 MODULE_DEPEND(acpi_hp, acpi_wmi, 1, 1, 1);
342 MODULE_DEPEND(acpi_hp, acpi, 1, 1, 1);
343 
344 static void
345 acpi_hp_evaluate_auto_on_off(struct acpi_hp_softc *sc)
346 {
347 	int	wireless;
348 	int	new_wlan_status;
349 	int	new_bluetooth_status;
350 	int	new_wwan_status;
351 
352 	wireless = acpi_hp_exec_wmi_command(sc->wmi_dev,
353 		    ACPI_HP_WMI_WIRELESS_COMMAND, 0, 0);
354 	new_wlan_status = -1;
355 	new_bluetooth_status = -1;
356 	new_wwan_status = -1;
357 
358 	if (sc->verbose)
359 		device_printf(sc->wmi_dev, "Wireless status is %x\n", wireless);
360 	if (sc->wlan_disable_if_radio_off && !(wireless & HP_MASK_WLAN_RADIO)
361 	    &&  (wireless & HP_MASK_WLAN_ENABLED)) {
362 		acpi_hp_exec_wmi_command(sc->wmi_dev,
363 		    ACPI_HP_WMI_WIRELESS_COMMAND, 1, 0x100);
364 		new_wlan_status = 0;
365 	}
366 	else if (sc->wlan_enable_if_radio_on && (wireless & HP_MASK_WLAN_RADIO)
367 		&&  !(wireless & HP_MASK_WLAN_ENABLED)) {
368 		acpi_hp_exec_wmi_command(sc->wmi_dev,
369 		    ACPI_HP_WMI_WIRELESS_COMMAND, 1, 0x101);
370 		new_wlan_status = 1;
371 	}
372 	if (sc->bluetooth_disable_if_radio_off &&
373 	    !(wireless & HP_MASK_BLUETOOTH_RADIO) &&
374 	    (wireless & HP_MASK_BLUETOOTH_ENABLED)) {
375 		acpi_hp_exec_wmi_command(sc->wmi_dev,
376 		    ACPI_HP_WMI_WIRELESS_COMMAND, 1, 0x200);
377 		new_bluetooth_status = 0;
378 	}
379 	else if (sc->bluetooth_enable_if_radio_on &&
380 		(wireless & HP_MASK_BLUETOOTH_RADIO) &&
381 		!(wireless & HP_MASK_BLUETOOTH_ENABLED)) {
382 		acpi_hp_exec_wmi_command(sc->wmi_dev,
383 		    ACPI_HP_WMI_WIRELESS_COMMAND, 1, 0x202);
384 		new_bluetooth_status = 1;
385 	}
386 	if (sc->wwan_disable_if_radio_off &&
387 	    !(wireless & HP_MASK_WWAN_RADIO) &&
388 	    (wireless & HP_MASK_WWAN_ENABLED)) {
389 		acpi_hp_exec_wmi_command(sc->wmi_dev,
390 		ACPI_HP_WMI_WIRELESS_COMMAND, 1, 0x400);
391 		new_wwan_status = 0;
392 	}
393 	else if (sc->wwan_enable_if_radio_on &&
394 		(wireless & HP_MASK_WWAN_RADIO) &&
395 		!(wireless & HP_MASK_WWAN_ENABLED)) {
396 		acpi_hp_exec_wmi_command(sc->wmi_dev,
397 		    ACPI_HP_WMI_WIRELESS_COMMAND, 1, 0x404);
398 		new_wwan_status = 1;
399 	}
400 
401 	if (new_wlan_status == -1) {
402 		new_wlan_status = (wireless & HP_MASK_WLAN_ON_AIR);
403 		if ((new_wlan_status?1:0) != sc->was_wlan_on_air) {
404 			sc->was_wlan_on_air = sc->was_wlan_on_air?0:1;
405 			if (sc->verbose)
406 				device_printf(sc->wmi_dev,
407 			    	    "WLAN on air changed to %i "
408 			    	    "(new_wlan_status is %i)\n",
409 			    	    sc->was_wlan_on_air, new_wlan_status);
410 			acpi_UserNotify("HP", ACPI_ROOT_OBJECT,
411 			    0xc0+sc->was_wlan_on_air);
412 		}
413 	}
414 	if (new_bluetooth_status == -1) {
415 		new_bluetooth_status = (wireless & HP_MASK_BLUETOOTH_ON_AIR);
416 		if ((new_bluetooth_status?1:0) != sc->was_bluetooth_on_air) {
417 			sc->was_bluetooth_on_air = sc->was_bluetooth_on_air?
418 			    0:1;
419 			if (sc->verbose)
420 				device_printf(sc->wmi_dev,
421 				    "BLUETOOTH on air changed"
422 				    " to %i (new_bluetooth_status is %i)\n",
423 				    sc->was_bluetooth_on_air,
424 				    new_bluetooth_status);
425 			acpi_UserNotify("HP", ACPI_ROOT_OBJECT,
426 			    0xd0+sc->was_bluetooth_on_air);
427 		}
428 	}
429 	if (new_wwan_status == -1) {
430 		new_wwan_status = (wireless & HP_MASK_WWAN_ON_AIR);
431 		if ((new_wwan_status?1:0) != sc->was_wwan_on_air) {
432 			sc->was_wwan_on_air = sc->was_wwan_on_air?0:1;
433 			if (sc->verbose)
434 				device_printf(sc->wmi_dev,
435 				    "WWAN on air changed to %i"
436 			    	    " (new_wwan_status is %i)\n",
437 				    sc->was_wwan_on_air, new_wwan_status);
438 			acpi_UserNotify("HP", ACPI_ROOT_OBJECT,
439 			    0xe0+sc->was_wwan_on_air);
440 		}
441 	}
442 }
443 
444 static void
445 acpi_hp_identify(driver_t *driver, device_t parent)
446 {
447 
448 	/* Don't do anything if driver is disabled. */
449 	if (acpi_disabled("hp"))
450 		return;
451 
452 	/* Add only a single device instance. */
453 	if (device_find_child(parent, "acpi_hp", -1) != NULL)
454 		return;
455 
456 	if (BUS_ADD_CHILD(parent, 0, "acpi_hp", -1) == NULL)
457 		device_printf(parent, "add acpi_hp child failed\n");
458 }
459 
460 static int
461 acpi_hp_probe(device_t dev)
462 {
463 
464 	device_set_desc(dev, "HP ACPI-WMI Mapping");
465 	return (0);
466 }
467 
468 static int
469 acpi_hp_attach(device_t dev)
470 {
471 	struct acpi_hp_softc	*sc;
472 	int			arg;
473 
474 	ACPI_FUNCTION_TRACE((char *)(uintptr_t) __func__);
475 
476 	sc = device_get_softc(dev);
477 	sc->dev = dev;
478 	sc->has_notify = 0;
479 	sc->has_cmi = 0;
480 	sc->bluetooth_enable_if_radio_on = 0;
481 	sc->bluetooth_disable_if_radio_off = 0;
482 	sc->wlan_enable_if_radio_on = 0;
483 	sc->wlan_disable_if_radio_off = 0;
484 	sc->wlan_enable_if_radio_on = 0;
485 	sc->wlan_disable_if_radio_off = 0;
486 	sc->was_wlan_on_air = 0;
487 	sc->was_bluetooth_on_air = 0;
488 	sc->was_wwan_on_air = 0;
489 	sc->cmi_detail = 0;
490 	sc->cmi_order_size = -1;
491 	sc->verbose = 0;
492 	memset(sc->cmi_order, 0, sizeof(sc->cmi_order));
493 
494 	sc->wmi_dev = device_get_parent(dev);
495 	if (!ACPI_WMI_PROVIDES_GUID_STRING(sc->wmi_dev,
496 	    ACPI_HP_WMI_BIOS_GUID)) {
497 		device_printf(dev,
498 		    "WMI device does not provide the HP BIOS GUID\n");
499 		return (EINVAL);
500 	}
501 	if (ACPI_WMI_PROVIDES_GUID_STRING(sc->wmi_dev,
502 	    ACPI_HP_WMI_EVENT_GUID)) {
503 		device_printf(dev,
504 		    "HP event GUID detected, installing event handler\n");
505 		if (ACPI_WMI_INSTALL_EVENT_HANDLER(sc->wmi_dev,
506 		    ACPI_HP_WMI_EVENT_GUID, acpi_hp_notify, dev)) {
507 			device_printf(dev,
508 			    "Could not install notification handler!\n");
509 		}
510 		else {
511 			sc->has_notify = 1;
512 		}
513 	}
514 	if ((sc->has_cmi =
515 	    ACPI_WMI_PROVIDES_GUID_STRING(sc->wmi_dev, ACPI_HP_WMI_CMI_GUID)
516 	    )) {
517 		device_printf(dev, "HP CMI GUID detected\n");
518 	}
519 
520 	if (sc->has_cmi) {
521 		sc->hpcmi_dev_t = make_dev(&hpcmi_cdevsw, 0, UID_ROOT,
522 			    GID_WHEEL, 0644, "hpcmi");
523 		sc->hpcmi_dev_t->si_drv1 = sc;
524 		sc->hpcmi_open_pid = 0;
525 		sc->hpcmi_bufptr = -1;
526 	}
527 
528 	ACPI_SERIAL_BEGIN(hp);
529 
530 	sc->sysctl_ctx = device_get_sysctl_ctx(dev);
531 	sc->sysctl_tree = device_get_sysctl_tree(dev);
532 	for (int i = 0; acpi_hp_sysctls[i].name != NULL; ++i) {
533 		arg = 0;
534 		if ((!sc->has_notify &&
535 		    (acpi_hp_sysctls[i].method ==
536 			ACPI_HP_METHOD_WLAN_ENABLE_IF_RADIO_ON ||
537 		    acpi_hp_sysctls[i].method ==
538 			ACPI_HP_METHOD_WLAN_DISABLE_IF_RADIO_OFF ||
539 		    acpi_hp_sysctls[i].method ==
540 			ACPI_HP_METHOD_BLUETOOTH_ENABLE_IF_RADIO_ON ||
541 		    acpi_hp_sysctls[i].method ==
542 			ACPI_HP_METHOD_BLUETOOTH_DISABLE_IF_RADIO_OFF ||
543 		    acpi_hp_sysctls[i].method ==
544 			ACPI_HP_METHOD_WWAN_ENABLE_IF_RADIO_ON ||
545 		    acpi_hp_sysctls[i].method ==
546 			ACPI_HP_METHOD_WWAN_DISABLE_IF_RADIO_OFF)) ||
547 		    (arg = acpi_hp_sysctl_get(sc,
548 		    acpi_hp_sysctls[i].method)) < 0) {
549 			continue;
550 		}
551 		if (acpi_hp_sysctls[i].method == ACPI_HP_METHOD_WLAN_ON_AIR) {
552 			sc->was_wlan_on_air = arg;
553 		}
554 		else if (acpi_hp_sysctls[i].method ==
555 			    ACPI_HP_METHOD_BLUETOOTH_ON_AIR) {
556 			sc->was_bluetooth_on_air = arg;
557 		}
558 		else if (acpi_hp_sysctls[i].method ==
559 			    ACPI_HP_METHOD_WWAN_ON_AIR) {
560 			sc->was_wwan_on_air = arg;
561 		}
562 
563 		SYSCTL_ADD_PROC(sc->sysctl_ctx,
564 		SYSCTL_CHILDREN(sc->sysctl_tree), OID_AUTO,
565 			acpi_hp_sysctls[i].name, acpi_hp_sysctls[i].access,
566 			sc, i, acpi_hp_sysctl, "I",
567 			acpi_hp_sysctls[i].description);
568 	}
569 	ACPI_SERIAL_END(hp);
570 
571 	return (0);
572 }
573 
574 static int
575 acpi_hp_detach(device_t dev)
576 {
577 	struct acpi_hp_softc *sc;
578 
579 	ACPI_FUNCTION_TRACE((char *)(uintptr_t) __func__);
580 	sc = device_get_softc(dev);
581 	if (sc->has_cmi && sc->hpcmi_open_pid != 0)
582 		return (EBUSY);
583 
584 	if (sc->has_notify)
585 		ACPI_WMI_REMOVE_EVENT_HANDLER(dev, ACPI_HP_WMI_EVENT_GUID);
586 
587 	if (sc->has_cmi) {
588 		if (sc->hpcmi_bufptr != -1) {
589 			sbuf_delete(&sc->hpcmi_sbuf);
590 			sc->hpcmi_bufptr = -1;
591 		}
592 		sc->hpcmi_open_pid = 0;
593 		destroy_dev(sc->hpcmi_dev_t);
594 	}
595 
596 	return (0);
597 }
598 
599 static int
600 acpi_hp_sysctl(SYSCTL_HANDLER_ARGS)
601 {
602 	struct acpi_hp_softc	*sc;
603 	int			arg;
604 	int			oldarg;
605 	int			error = 0;
606 	int			function;
607 	int			method;
608 
609 	ACPI_FUNCTION_TRACE((char *)(uintptr_t)__func__);
610 
611 	sc = (struct acpi_hp_softc *)oidp->oid_arg1;
612 	function = oidp->oid_arg2;
613 	method = acpi_hp_sysctls[function].method;
614 
615 	ACPI_SERIAL_BEGIN(hp);
616 	arg = acpi_hp_sysctl_get(sc, method);
617 	oldarg = arg;
618 	error = sysctl_handle_int(oidp, &arg, 0, req);
619 	if (!error && req->newptr != NULL) {
620 		error = acpi_hp_sysctl_set(sc, method, arg, oldarg);
621 	}
622 	ACPI_SERIAL_END(hp);
623 
624 	return (error);
625 }
626 
627 static int
628 acpi_hp_sysctl_get(struct acpi_hp_softc *sc, int method)
629 {
630 	int	val = 0;
631 
632 	ACPI_FUNCTION_TRACE((char *)(uintptr_t)__func__);
633 	ACPI_SERIAL_ASSERT(hp);
634 
635 	switch (method) {
636 	case ACPI_HP_METHOD_WLAN_ENABLED:
637 		val = acpi_hp_exec_wmi_command(sc->wmi_dev,
638 			ACPI_HP_WMI_WIRELESS_COMMAND, 0, 0);
639 		val = ((val & HP_MASK_WLAN_ENABLED) != 0);
640 		break;
641 	case ACPI_HP_METHOD_WLAN_RADIO:
642 		val = acpi_hp_exec_wmi_command(sc->wmi_dev,
643 			ACPI_HP_WMI_WIRELESS_COMMAND, 0, 0);
644 		val = ((val & HP_MASK_WLAN_RADIO) != 0);
645 		break;
646 	case ACPI_HP_METHOD_WLAN_ON_AIR:
647 		val = acpi_hp_exec_wmi_command(sc->wmi_dev,
648 			ACPI_HP_WMI_WIRELESS_COMMAND, 0, 0);
649 		val = ((val & HP_MASK_WLAN_ON_AIR) != 0);
650 		break;
651 	case ACPI_HP_METHOD_WLAN_ENABLE_IF_RADIO_ON:
652 		val = sc->wlan_enable_if_radio_on;
653 		break;
654 	case ACPI_HP_METHOD_WLAN_DISABLE_IF_RADIO_OFF:
655 		val = sc->wlan_disable_if_radio_off;
656 		break;
657 	case ACPI_HP_METHOD_BLUETOOTH_ENABLED:
658 		val = acpi_hp_exec_wmi_command(sc->wmi_dev,
659 			ACPI_HP_WMI_WIRELESS_COMMAND, 0, 0);
660 		val = ((val & HP_MASK_BLUETOOTH_ENABLED) != 0);
661 		break;
662 	case ACPI_HP_METHOD_BLUETOOTH_RADIO:
663 		val = acpi_hp_exec_wmi_command(sc->wmi_dev,
664 			ACPI_HP_WMI_WIRELESS_COMMAND, 0, 0);
665 		val = ((val & HP_MASK_BLUETOOTH_RADIO) != 0);
666 		break;
667 	case ACPI_HP_METHOD_BLUETOOTH_ON_AIR:
668 		val = acpi_hp_exec_wmi_command(sc->wmi_dev,
669 			ACPI_HP_WMI_WIRELESS_COMMAND, 0, 0);
670 		val = ((val & HP_MASK_BLUETOOTH_ON_AIR) != 0);
671 		break;
672 	case ACPI_HP_METHOD_BLUETOOTH_ENABLE_IF_RADIO_ON:
673 		val = sc->bluetooth_enable_if_radio_on;
674 		break;
675 	case ACPI_HP_METHOD_BLUETOOTH_DISABLE_IF_RADIO_OFF:
676 		val = sc->bluetooth_disable_if_radio_off;
677 		break;
678 	case ACPI_HP_METHOD_WWAN_ENABLED:
679 		val = acpi_hp_exec_wmi_command(sc->wmi_dev,
680 			ACPI_HP_WMI_WIRELESS_COMMAND, 0, 0);
681 		val = ((val & HP_MASK_WWAN_ENABLED) != 0);
682 		break;
683 	case ACPI_HP_METHOD_WWAN_RADIO:
684 		val = acpi_hp_exec_wmi_command(sc->wmi_dev,
685 			ACPI_HP_WMI_WIRELESS_COMMAND, 0, 0);
686 		val = ((val & HP_MASK_WWAN_RADIO) != 0);
687 		break;
688 	case ACPI_HP_METHOD_WWAN_ON_AIR:
689 		val = acpi_hp_exec_wmi_command(sc->wmi_dev,
690 			ACPI_HP_WMI_WIRELESS_COMMAND, 0, 0);
691 		val = ((val & HP_MASK_WWAN_ON_AIR) != 0);
692 		break;
693 	case ACPI_HP_METHOD_WWAN_ENABLE_IF_RADIO_ON:
694 		val = sc->wwan_enable_if_radio_on;
695 		break;
696 	case ACPI_HP_METHOD_WWAN_DISABLE_IF_RADIO_OFF:
697 		val = sc->wwan_disable_if_radio_off;
698 		break;
699 	case ACPI_HP_METHOD_ALS:
700 		val = acpi_hp_exec_wmi_command(sc->wmi_dev,
701 			ACPI_HP_WMI_ALS_COMMAND, 0, 0);
702 		break;
703 	case ACPI_HP_METHOD_DISPLAY:
704 		val = acpi_hp_exec_wmi_command(sc->wmi_dev,
705 			ACPI_HP_WMI_DISPLAY_COMMAND, 0, 0);
706 		break;
707 	case ACPI_HP_METHOD_HDDTEMP:
708 		val = acpi_hp_exec_wmi_command(sc->wmi_dev,
709 			ACPI_HP_WMI_HDDTEMP_COMMAND, 0, 0);
710 		break;
711 	case ACPI_HP_METHOD_DOCK:
712 		val = acpi_hp_exec_wmi_command(sc->wmi_dev,
713 			ACPI_HP_WMI_DOCK_COMMAND, 0, 0);
714 		break;
715 	case ACPI_HP_METHOD_CMI_DETAIL:
716 		val = sc->cmi_detail;
717 		break;
718 	case ACPI_HP_METHOD_VERBOSE:
719 		val = sc->verbose;
720 		break;
721 	}
722 
723 	return (val);
724 }
725 
726 static int
727 acpi_hp_sysctl_set(struct acpi_hp_softc *sc, int method, int arg, int oldarg)
728 {
729 	ACPI_FUNCTION_TRACE((char *)(uintptr_t)__func__);
730 	ACPI_SERIAL_ASSERT(hp);
731 
732 	if (method != ACPI_HP_METHOD_CMI_DETAIL &&
733 	    method != ACPI_HP_METHOD_VERBOSE)
734 		arg = arg?1:0;
735 
736 	if (arg != oldarg) {
737 		switch (method) {
738 		case ACPI_HP_METHOD_WLAN_ENABLED:
739 			return (acpi_hp_exec_wmi_command(sc->wmi_dev,
740 				    ACPI_HP_WMI_WIRELESS_COMMAND, 1,
741 				    arg?0x101:0x100));
742 		case ACPI_HP_METHOD_WLAN_ENABLE_IF_RADIO_ON:
743 			sc->wlan_enable_if_radio_on = arg;
744 			acpi_hp_evaluate_auto_on_off(sc);
745 			break;
746 		case ACPI_HP_METHOD_WLAN_DISABLE_IF_RADIO_OFF:
747 			sc->wlan_disable_if_radio_off = arg;
748 			acpi_hp_evaluate_auto_on_off(sc);
749 			break;
750 		case ACPI_HP_METHOD_BLUETOOTH_ENABLED:
751 			return (acpi_hp_exec_wmi_command(sc->wmi_dev,
752 				    ACPI_HP_WMI_WIRELESS_COMMAND, 1,
753 				    arg?0x202:0x200));
754 		case ACPI_HP_METHOD_BLUETOOTH_ENABLE_IF_RADIO_ON:
755 			sc->bluetooth_enable_if_radio_on = arg;
756 			acpi_hp_evaluate_auto_on_off(sc);
757 			break;
758 		case ACPI_HP_METHOD_BLUETOOTH_DISABLE_IF_RADIO_OFF:
759 			sc->bluetooth_disable_if_radio_off = arg?1:0;
760 			acpi_hp_evaluate_auto_on_off(sc);
761 			break;
762 		case ACPI_HP_METHOD_WWAN_ENABLED:
763 			return (acpi_hp_exec_wmi_command(sc->wmi_dev,
764 				    ACPI_HP_WMI_WIRELESS_COMMAND, 1,
765 				    arg?0x404:0x400));
766 		case ACPI_HP_METHOD_WWAN_ENABLE_IF_RADIO_ON:
767 			sc->wwan_enable_if_radio_on = arg?1:0;
768 			acpi_hp_evaluate_auto_on_off(sc);
769 			break;
770 		case ACPI_HP_METHOD_WWAN_DISABLE_IF_RADIO_OFF:
771 			sc->wwan_disable_if_radio_off = arg?1:0;
772 			acpi_hp_evaluate_auto_on_off(sc);
773 			break;
774 		case ACPI_HP_METHOD_ALS:
775 			return (acpi_hp_exec_wmi_command(sc->wmi_dev,
776 				    ACPI_HP_WMI_ALS_COMMAND, 1,
777 				    arg?1:0));
778 		case ACPI_HP_METHOD_CMI_DETAIL:
779 			sc->cmi_detail = arg;
780 			if ((arg & ACPI_HP_CMI_DETAIL_SHOW_MAX_INSTANCE) !=
781 			    (oldarg & ACPI_HP_CMI_DETAIL_SHOW_MAX_INSTANCE)) {
782 			    sc->cmi_order_size = -1;
783 			}
784 			break;
785 		case ACPI_HP_METHOD_VERBOSE:
786 			sc->verbose = arg;
787 			break;
788 		}
789 	}
790 
791 	return (0);
792 }
793 
794 static __inline void
795 acpi_hp_free_buffer(ACPI_BUFFER* buf) {
796 	if (buf && buf->Pointer) {
797 		AcpiOsFree(buf->Pointer);
798 	}
799 }
800 
801 static void
802 acpi_hp_notify(ACPI_HANDLE h, UINT32 notify, void *context)
803 {
804 	device_t dev = context;
805 	ACPI_FUNCTION_TRACE_U32((char *)(uintptr_t)__func__, notify);
806 
807 	struct acpi_hp_softc *sc = device_get_softc(dev);
808 	ACPI_BUFFER response = { ACPI_ALLOCATE_BUFFER, NULL };
809 	ACPI_OBJECT *obj;
810 	ACPI_WMI_GET_EVENT_DATA(sc->wmi_dev, notify, &response);
811 	obj = (ACPI_OBJECT*) response.Pointer;
812 	if (obj && obj->Type == ACPI_TYPE_BUFFER && obj->Buffer.Length == 8) {
813 		if (*((UINT8 *) obj->Buffer.Pointer) == 0x5) {
814 			acpi_hp_evaluate_auto_on_off(sc);
815 		}
816 	}
817 	acpi_hp_free_buffer(&response);
818 }
819 
820 static int
821 acpi_hp_exec_wmi_command(device_t wmi_dev, int command, int is_write, int val)
822 {
823 	UINT32		params[5] = { 0x55434553,
824 			    is_write?2:1,
825 			    command,
826 			    is_write?4:0,
827 			    val};
828 	UINT32*		result;
829 	ACPI_OBJECT	*obj;
830 	ACPI_BUFFER	in = { sizeof(params), &params };
831 	ACPI_BUFFER	out = { ACPI_ALLOCATE_BUFFER, NULL };
832 	int retval;
833 
834 	if (ACPI_FAILURE(ACPI_WMI_EVALUATE_CALL(wmi_dev, ACPI_HP_WMI_BIOS_GUID,
835 		    0, 0x3, &in, &out))) {
836 		acpi_hp_free_buffer(&out);
837 		return (-EINVAL);
838 	}
839 	obj = out.Pointer;
840 	if (!obj || obj->Type != ACPI_TYPE_BUFFER) {
841 		acpi_hp_free_buffer(&out);
842 		return (-EINVAL);
843 	}
844 	result = (UINT32*) obj->Buffer.Pointer;
845 	retval = result[2];
846 	if (result[1] > 0) {
847 		retval = result[1];
848 	}
849 	acpi_hp_free_buffer(&out);
850 
851 	return (retval);
852 }
853 
854 static __inline char*
855 acpi_hp_get_string_from_object(ACPI_OBJECT* obj, char* dst, size_t size) {
856 	int	length;
857 
858 	dst[0] = 0;
859 	if (obj->Type == ACPI_TYPE_STRING) {
860 		length = obj->String.Length+1;
861 		if (length > size) {
862 			length = size - 1;
863 		}
864 		strlcpy(dst, obj->String.Pointer, length);
865 		acpi_hp_hex_decode(dst);
866 	}
867 
868 	return (dst);
869 }
870 
871 
872 /*
873  * Read BIOS Setting block in instance "instance".
874  * The block returned is ACPI_TYPE_PACKAGE which should contain the following
875  * elements:
876  * Index Meaning
877  * 0        Setting Name [string]
878  * 1        Value (comma separated, asterisk marks the current value) [string]
879  * 2        Path within the bios hierarchy [string]
880  * 3        IsReadOnly [int]
881  * 4        DisplayInUI [int]
882  * 5        RequiresPhysicalPresence [int]
883  * 6        Sequence for ordering within the bios settings (absolute) [int]
884  * 7        Length of prerequisites array [int]
885  * 8..8+[7] PrerequisiteN [string]
886  * 9+[7]    Current value (in case of enum) [string] / Array length [int]
887  * 10+[7]   Enum length [int] / Array values
888  * 11+[7]ff Enum value at index x [string]
889  */
890 static int
891 acpi_hp_get_cmi_block(device_t wmi_dev, const char* guid, UINT8 instance,
892     char* outbuf, size_t outsize, UINT32* sequence, int detail)
893 {
894 	ACPI_OBJECT	*obj;
895 	ACPI_BUFFER	out = { ACPI_ALLOCATE_BUFFER, NULL };
896 	int		i;
897 	int		outlen;
898 	int		size = 255;
899 	int		has_enums = 0;
900 	int		valuebase = 0;
901 	char		string_buffer[size];
902 	int		enumbase;
903 
904 	outlen = 0;
905 	outbuf[0] = 0;
906 	if (ACPI_FAILURE(ACPI_WMI_GET_BLOCK(wmi_dev, guid, instance, &out))) {
907 		acpi_hp_free_buffer(&out);
908 		return (-EINVAL);
909 	}
910 	obj = out.Pointer;
911 	if (!obj || obj->Type != ACPI_TYPE_PACKAGE) {
912 		acpi_hp_free_buffer(&out);
913 		return (-EINVAL);
914 	}
915 
916 	if (obj->Package.Count >= 8 &&
917 	    obj->Package.Elements[7].Type == ACPI_TYPE_INTEGER) {
918 	    valuebase = 8 + obj->Package.Elements[7].Integer.Value;
919 	}
920 
921 	/* check if this matches our expectations based on limited knowledge */
922 	if (valuebase > 7 && obj->Package.Count > valuebase + 1 &&
923 	    obj->Package.Elements[0].Type == ACPI_TYPE_STRING &&
924 	    obj->Package.Elements[1].Type == ACPI_TYPE_STRING &&
925 	    obj->Package.Elements[2].Type == ACPI_TYPE_STRING &&
926 	    obj->Package.Elements[3].Type == ACPI_TYPE_INTEGER &&
927 	    obj->Package.Elements[4].Type == ACPI_TYPE_INTEGER &&
928 	    obj->Package.Elements[5].Type == ACPI_TYPE_INTEGER &&
929 	    obj->Package.Elements[6].Type == ACPI_TYPE_INTEGER &&
930 	    obj->Package.Elements[valuebase].Type == ACPI_TYPE_STRING &&
931 	    obj->Package.Elements[valuebase+1].Type == ACPI_TYPE_INTEGER &&
932 	    obj->Package.Count > valuebase +
933 	        obj->Package.Elements[valuebase+1].Integer.Value
934 	   ) {
935 		enumbase = valuebase + 1;
936 		if (detail & ACPI_HP_CMI_DETAIL_PATHS) {
937 			strlcat(outbuf, acpi_hp_get_string_from_object(
938 				&obj->Package.Elements[2], string_buffer, size),
939 				outsize);
940 			outlen += 48;
941 			while (strlen(outbuf) < outlen)
942 				strlcat(outbuf, " ", outsize);
943 		}
944 		strlcat(outbuf, acpi_hp_get_string_from_object(
945 				&obj->Package.Elements[0], string_buffer, size),
946 				outsize);
947 		outlen += 43;
948 		while (strlen(outbuf) < outlen)
949 			strlcat(outbuf, " ", outsize);
950 		strlcat(outbuf, acpi_hp_get_string_from_object(
951 				&obj->Package.Elements[valuebase], string_buffer,
952 				size),
953 				outsize);
954 		outlen += 21;
955 		while (strlen(outbuf) < outlen)
956 			strlcat(outbuf, " ", outsize);
957 		for (i = 0; i < strlen(outbuf); ++i)
958 			if (outbuf[i] == '\\')
959 				outbuf[i] = '/';
960 		if (detail & ACPI_HP_CMI_DETAIL_ENUMS) {
961 			for (i = enumbase + 1; i < enumbase + 1 +
962 			    obj->Package.Elements[enumbase].Integer.Value;
963 			    ++i) {
964 				acpi_hp_get_string_from_object(
965 				    &obj->Package.Elements[i], string_buffer,
966 				    size);
967 				if (strlen(string_buffer) > 1 ||
968 				    (strlen(string_buffer) == 1 &&
969 				    string_buffer[0] != ' ')) {
970 					if (has_enums)
971 						strlcat(outbuf, "/", outsize);
972 					else
973 						strlcat(outbuf, " (", outsize);
974 					strlcat(outbuf, string_buffer, outsize);
975 					has_enums = 1;
976 				}
977 			}
978 		}
979 		if (has_enums)
980 			strlcat(outbuf, ")", outsize);
981 		if (detail & ACPI_HP_CMI_DETAIL_FLAGS) {
982 			strlcat(outbuf, obj->Package.Elements[3].Integer.Value?
983 			    " [ReadOnly]":"", outsize);
984 			strlcat(outbuf, obj->Package.Elements[4].Integer.Value?
985 			    "":" [NOUI]", outsize);
986 			strlcat(outbuf, obj->Package.Elements[5].Integer.Value?
987 			    " [RPP]":"", outsize);
988 		}
989 		*sequence = (UINT32) obj->Package.Elements[6].Integer.Value;
990 	}
991 	acpi_hp_free_buffer(&out);
992 
993 	return (0);
994 }
995 
996 
997 
998 /*
999  * Convert given two digit hex string (hexin) to an UINT8 referenced
1000  * by byteout.
1001  * Return != 0 if the was a problem (invalid input)
1002  */
1003 static __inline int acpi_hp_hex_to_int(const UINT8 *hexin, UINT8 *byteout)
1004 {
1005 	unsigned int	hi;
1006 	unsigned int	lo;
1007 
1008 	hi = hexin[0];
1009 	lo = hexin[1];
1010 	if ('0' <= hi && hi <= '9')
1011 		hi -= '0';
1012 	else if ('A' <= hi && hi <= 'F')
1013 		hi -= ('A' - 10);
1014 	else if ('a' <= hi && hi <= 'f')
1015 		hi -= ('a' - 10);
1016 	else
1017 		return (1);
1018 	if ('0' <= lo && lo <= '9')
1019 		lo -= '0';
1020 	else if ('A' <= lo && lo <= 'F')
1021 		lo -= ('A' - 10);
1022 	else if ('a' <= lo && lo <= 'f')
1023 		lo -= ('a' - 10);
1024 	else
1025 		return (1);
1026 	*byteout = (hi << 4) + lo;
1027 
1028 	return (0);
1029 }
1030 
1031 
1032 static void
1033 acpi_hp_hex_decode(char* buffer)
1034 {
1035 	int	i;
1036 	int	length = strlen(buffer);
1037 	UINT8	*uin;
1038 	UINT8	uout;
1039 
1040 	if (((int)length/2)*2 == length || length < 10) return;
1041 
1042 	for (i = 0; i<length; ++i) {
1043 		if (!((i+1)%3)) {
1044 			if (buffer[i] != ' ')
1045 				return;
1046 		}
1047 		else
1048 			if (!((buffer[i] >= '0' && buffer[i] <= '9') ||
1049 		    	    (buffer[i] >= 'A' && buffer[i] <= 'F')))
1050 				return;
1051 	}
1052 
1053 	for (i = 0; i<length; i += 3) {
1054 		uin = &buffer[i];
1055 		uout = 0;
1056 		acpi_hp_hex_to_int(uin, &uout);
1057 		buffer[i/3] = (char) uout;
1058 	}
1059 	buffer[(length+1)/3] = 0;
1060 }
1061 
1062 
1063 /*
1064  * open hpcmi device
1065  */
1066 static int
1067 acpi_hp_hpcmi_open(struct cdev* dev, int flags, int mode, struct thread *td)
1068 {
1069 	struct acpi_hp_softc	*sc;
1070 	int			ret;
1071 
1072 	if (dev == NULL || dev->si_drv1 == NULL)
1073 		return (EBADF);
1074 	sc = dev->si_drv1;
1075 
1076 	ACPI_SERIAL_BEGIN(hp);
1077 	if (sc->hpcmi_open_pid != 0) {
1078 		ret = EBUSY;
1079 	}
1080 	else {
1081 		if (sbuf_new(&sc->hpcmi_sbuf, NULL, 4096, SBUF_AUTOEXTEND)
1082 		    == NULL) {
1083 			ret = ENXIO;
1084 		} else {
1085 			sc->hpcmi_open_pid = td->td_proc->p_pid;
1086 			sc->hpcmi_bufptr = 0;
1087 			ret = 0;
1088 		}
1089 	}
1090 	ACPI_SERIAL_END(hp);
1091 
1092 	return (ret);
1093 }
1094 
1095 /*
1096  * close hpcmi device
1097  */
1098 static int
1099 acpi_hp_hpcmi_close(struct cdev* dev, int flags, int mode, struct thread *td)
1100 {
1101 	struct acpi_hp_softc	*sc;
1102 	int			ret;
1103 
1104 	if (dev == NULL || dev->si_drv1 == NULL)
1105 		return (EBADF);
1106 	sc = dev->si_drv1;
1107 
1108 	ACPI_SERIAL_BEGIN(hp);
1109 	if (sc->hpcmi_open_pid == 0) {
1110 		ret = EBADF;
1111 	}
1112 	else {
1113 		if (sc->hpcmi_bufptr != -1) {
1114 			sbuf_delete(&sc->hpcmi_sbuf);
1115 			sc->hpcmi_bufptr = -1;
1116 		}
1117 		sc->hpcmi_open_pid = 0;
1118 		ret = 0;
1119 	}
1120 	ACPI_SERIAL_END(hp);
1121 
1122 	return (ret);
1123 }
1124 
1125 /*
1126  * Read from hpcmi bios information
1127  */
1128 static int
1129 acpi_hp_hpcmi_read(struct cdev *dev, struct uio *buf, int flag)
1130 {
1131 	struct acpi_hp_softc	*sc;
1132 	int			pos, i, l, ret;
1133 	UINT8			instance;
1134 	UINT8			maxInstance;
1135 	UINT32			sequence;
1136 	int			linesize = 1025;
1137 	char			line[linesize];
1138 
1139 	if (dev == NULL || dev->si_drv1 == NULL)
1140 		return (EBADF);
1141 	sc = dev->si_drv1;
1142 
1143 	ACPI_SERIAL_BEGIN(hp);
1144 	if (sc->hpcmi_open_pid != buf->uio_td->td_proc->p_pid
1145 	    || sc->hpcmi_bufptr == -1) {
1146 		ret = EBADF;
1147 	}
1148 	else {
1149 		if (!sbuf_done(&sc->hpcmi_sbuf)) {
1150 			if (sc->cmi_order_size < 0) {
1151 				maxInstance = sc->has_cmi;
1152 				if (!(sc->cmi_detail &
1153 				    ACPI_HP_CMI_DETAIL_SHOW_MAX_INSTANCE) &&
1154 				    maxInstance > 0) {
1155 					maxInstance--;
1156 				}
1157 				sc->cmi_order_size = 0;
1158 				for (instance = 0; instance < maxInstance;
1159 				    ++instance) {
1160 					if (acpi_hp_get_cmi_block(sc->wmi_dev,
1161 						ACPI_HP_WMI_CMI_GUID, instance,
1162 						line, linesize, &sequence,
1163 						sc->cmi_detail)) {
1164 						instance = maxInstance;
1165 					}
1166 					else {
1167 						pos = sc->cmi_order_size;
1168 						for (i=0;
1169 						  i<sc->cmi_order_size && i<127;
1170 						     ++i) {
1171 				if (sc->cmi_order[i].sequence > sequence) {
1172 								pos = i;
1173 								break;
1174 							}
1175 						}
1176 						for (i=sc->cmi_order_size;
1177 						    i>pos;
1178 						    --i) {
1179 						sc->cmi_order[i].sequence =
1180 						    sc->cmi_order[i-1].sequence;
1181 						sc->cmi_order[i].instance =
1182 						    sc->cmi_order[i-1].instance;
1183 						}
1184 						sc->cmi_order[pos].sequence =
1185 						    sequence;
1186 						sc->cmi_order[pos].instance =
1187 						    instance;
1188 						sc->cmi_order_size++;
1189 					}
1190 				}
1191 			}
1192 			for (i=0; i<sc->cmi_order_size; ++i) {
1193 				if (!acpi_hp_get_cmi_block(sc->wmi_dev,
1194 				    ACPI_HP_WMI_CMI_GUID,
1195 				    sc->cmi_order[i].instance, line, linesize,
1196 				    &sequence, sc->cmi_detail)) {
1197 					sbuf_printf(&sc->hpcmi_sbuf, "%s\n", line);
1198 				}
1199 			}
1200 			sbuf_finish(&sc->hpcmi_sbuf);
1201 		}
1202 		if (sbuf_len(&sc->hpcmi_sbuf) <= 0) {
1203 			sbuf_delete(&sc->hpcmi_sbuf);
1204 			sc->hpcmi_bufptr = -1;
1205 			sc->hpcmi_open_pid = 0;
1206 			ret = ENOMEM;
1207 		} else {
1208 			l = min(buf->uio_resid, sbuf_len(&sc->hpcmi_sbuf) -
1209 			    sc->hpcmi_bufptr);
1210 			ret = (l > 0)?uiomove(sbuf_data(&sc->hpcmi_sbuf) +
1211 			    sc->hpcmi_bufptr, l, buf) : 0;
1212 			sc->hpcmi_bufptr += l;
1213 		}
1214 	}
1215 	ACPI_SERIAL_END(hp);
1216 
1217 	return (ret);
1218 }
1219