xref: /openbsd/sys/dev/acpi/acpivout.c (revision 771fbea0) 
1 /*	$OpenBSD: acpivout.c,v 1.24 2020/09/16 11:52:17 jsg Exp $	*/
2 /*
3  * Copyright (c) 2009 Paul Irofti <paul@irofti.net>
4  *
5  * Permission to use, copy, modify, and/or distribute this software for any
6  * purpose with or without fee is hereby granted, provided that the above
7  * copyright notice and this permission notice appear in all copies.
8  *
9  * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
10  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
11  * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
12  * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
13  * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
14  * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
15  * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
16  */
17 
18 #include <sys/param.h>
19 #include <sys/systm.h>
20 #include <sys/device.h>
21 #include <sys/malloc.h>
22 
23 #include <machine/bus.h>
24 
25 #include <dev/acpi/acpivar.h>
26 #include <dev/acpi/acpidev.h>
27 #include <dev/acpi/amltypes.h>
28 #include <dev/acpi/dsdt.h>
29 
30 #include <dev/wscons/wsconsio.h>
31 #include <dev/wscons/wsdisplayvar.h>
32 
33 int	acpivout_match(struct device *, void *, void *);
34 void	acpivout_attach(struct device *, struct device *, void *);
35 int	acpivout_notify(struct aml_node *, int, void *);
36 
37 #ifdef ACPIVIDEO_DEBUG
38 #define DPRINTF(x)	printf x
39 #else
40 #define DPRINTF(x)
41 #endif
42 
43 /* Notifications for Output Devices */
44 #define NOTIFY_BRIGHTNESS_CYCLE		0x85
45 #define NOTIFY_BRIGHTNESS_UP		0x86
46 #define NOTIFY_BRIGHTNESS_DOWN		0x87
47 #define NOTIFY_BRIGHTNESS_ZERO		0x88
48 #define NOTIFY_DISPLAY_OFF		0x89
49 
50 #define BRIGHTNESS_STEP			5
51 
52 struct acpivout_softc {
53 	struct device		sc_dev;
54 
55 	bus_space_tag_t		sc_iot;
56 	bus_space_handle_t	sc_ioh;
57 
58 	struct acpi_softc	*sc_acpi;
59 	struct aml_node		*sc_devnode;
60 
61 	int	*sc_bcl;
62 	size_t	sc_bcl_len;
63 
64 	int	sc_brightness;
65 };
66 
67 int	acpivout_get_brightness(struct acpivout_softc *);
68 int	acpivout_select_brightness(struct acpivout_softc *, int);
69 int	acpivout_find_brightness(struct acpivout_softc *, int);
70 void	acpivout_set_brightness(void *, int);
71 void	acpivout_get_bcl(struct acpivout_softc *);
72 
73 /* wconsole hook functions */
74 int	acpivout_get_param(struct wsdisplay_param *);
75 int	acpivout_set_param(struct wsdisplay_param *);
76 
77 struct cfattach acpivout_ca = {
78 	sizeof(struct acpivout_softc), acpivout_match, acpivout_attach
79 };
80 
81 struct cfdriver acpivout_cd = {
82 	NULL, "acpivout", DV_DULL
83 };
84 
85 int
86 acpivout_match(struct device *parent, void *match, void *aux)
87 {
88 	struct acpi_attach_args	*aaa = aux;
89 	struct cfdata		*cf = match;
90 
91 	if (aaa->aaa_name == NULL ||
92 	    strcmp(aaa->aaa_name, cf->cf_driver->cd_name) != 0 ||
93 	    aaa->aaa_table != NULL)
94 		return (0);
95 
96 	return (1);
97 }
98 
99 void
100 acpivout_attach(struct device *parent, struct device *self, void *aux)
101 {
102 	struct acpivout_softc	*sc = (struct acpivout_softc *)self;
103 	struct acpi_attach_args	*aaa = aux;
104 
105 	sc->sc_acpi = ((struct acpivideo_softc *)parent)->sc_acpi;
106 	sc->sc_devnode = aaa->aaa_node;
107 
108 	printf(": %s\n", sc->sc_devnode->name);
109 
110 	aml_register_notify(sc->sc_devnode, aaa->aaa_dev,
111 	    acpivout_notify, sc, ACPIDEV_NOPOLL);
112 
113 	if (!aml_searchname(sc->sc_devnode, "_BQC") ||
114 	    ws_get_param || ws_set_param ||
115 	    acpi_max_osi >= OSI_WIN_8)
116 		return;
117 
118 	acpivout_get_bcl(sc);
119 	if (sc->sc_bcl_len == 0)
120 		return;
121 
122 	sc->sc_brightness = acpivout_get_brightness(sc);
123 
124 	ws_get_param = acpivout_get_param;
125 	ws_set_param = acpivout_set_param;
126 }
127 
128 int
129 acpivout_notify(struct aml_node *node, int notify, void *arg)
130 {
131 	struct acpivout_softc *sc = arg;
132 
133 	switch (notify) {
134 	case NOTIFY_BRIGHTNESS_CYCLE:
135 		wsdisplay_brightness_cycle(NULL);
136 		break;
137 	case NOTIFY_BRIGHTNESS_UP:
138 		wsdisplay_brightness_step(NULL, 1);
139 		break;
140 	case NOTIFY_BRIGHTNESS_DOWN:
141 		wsdisplay_brightness_step(NULL, -1);
142 		break;
143 	case NOTIFY_BRIGHTNESS_ZERO:
144 		wsdisplay_brightness_zero(NULL);
145 		break;
146 	case NOTIFY_DISPLAY_OFF:
147 		/* TODO: D3 state change */
148 		break;
149 	default:
150 		printf("%s: unknown event 0x%02x\n", DEVNAME(sc), notify);
151 		break;
152 	}
153 
154 	return (0);
155 }
156 
157 
158 int
159 acpivout_get_brightness(struct acpivout_softc *sc)
160 {
161 	struct aml_value res;
162 	int level;
163 
164 	aml_evalname(sc->sc_acpi, sc->sc_devnode, "_BQC", 0, NULL, &res);
165 	level = aml_val2int(&res);
166 	aml_freevalue(&res);
167 	DPRINTF(("%s: BQC = %d\n", DEVNAME(sc), level));
168 
169 	if (level < sc->sc_bcl[0])
170 		level = sc->sc_bcl[0];
171 	else if (level > sc->sc_bcl[sc->sc_bcl_len - 1])
172 		level = sc->sc_bcl[sc->sc_bcl_len - 1];
173 
174 	return (level);
175 }
176 
177 int
178 acpivout_select_brightness(struct acpivout_softc *sc, int nlevel)
179 {
180 	int nindex, level;
181 
182 	level = sc->sc_brightness;
183 	nindex = acpivout_find_brightness(sc, nlevel);
184 	if (sc->sc_bcl[nindex] == level) {
185 		if (nlevel > level && (nindex + 1 < sc->sc_bcl_len))
186 			nindex++;
187 		else if (nlevel < level && (nindex - 1 >= 0))
188 			nindex--;
189 	}
190 
191 	return nindex;
192 }
193 
194 int
195 acpivout_find_brightness(struct acpivout_softc *sc, int level)
196 {
197 	int i, mid;
198 
199 	for (i = 0; i < sc->sc_bcl_len - 1; i++) {
200 		mid = sc->sc_bcl[i] + (sc->sc_bcl[i + 1] - sc->sc_bcl[i]) / 2;
201 		if (sc->sc_bcl[i] <= level && level <=  mid)
202 			return i;
203 		if  (mid < level && level <= sc->sc_bcl[i + 1])
204 			return i + 1;
205 	}
206 	if (level < sc->sc_bcl[0])
207 		return 0;
208 	else
209 		return i;
210 }
211 
212 void
213 acpivout_set_brightness(void *arg0, int arg1)
214 {
215 	struct acpivout_softc *sc = arg0;
216 	struct aml_value args, res;
217 
218 	memset(&args, 0, sizeof(args));
219 	args.v_integer = sc->sc_brightness;
220 	args.type = AML_OBJTYPE_INTEGER;
221 
222 	DPRINTF(("%s: BCM = %d\n", DEVNAME(sc), sc->sc_brightness));
223 	aml_evalname(sc->sc_acpi, sc->sc_devnode, "_BCM", 1, &args, &res);
224 
225 	aml_freevalue(&res);
226 }
227 
228 void
229 acpivout_get_bcl(struct acpivout_softc *sc)
230 {
231 	int	i, j, value;
232 	struct aml_value res;
233 
234 	DPRINTF(("Getting _BCL!"));
235 	aml_evalname(sc->sc_acpi, sc->sc_devnode, "_BCL", 0, NULL, &res);
236 	if (res.type != AML_OBJTYPE_PACKAGE) {
237 		sc->sc_bcl_len = 0;
238 		goto err;
239 	}
240 	/*
241 	 * Per the ACPI spec section B.6.2 the _BCL method returns a package.
242 	 * The first integer in the package is the brightness level
243 	 * when the computer has full power, and the second is the
244 	 * brightness level when the computer is on batteries.
245 	 * All other levels may be used by OSPM.
246 	 * So we skip the first two integers in the package.
247 	 */
248 	if (res.length <= 2) {
249 		sc->sc_bcl_len = 0;
250 		goto err;
251 	}
252 	sc->sc_bcl_len = res.length - 2;
253 
254 	sc->sc_bcl = mallocarray(sc->sc_bcl_len, sizeof(int), M_DEVBUF,
255 	    M_WAITOK | M_ZERO);
256 
257 	for (i = 0; i < sc->sc_bcl_len; i++) {
258 		/* Sort darkest to brightest */
259 		value = aml_val2int(res.v_package[i + 2]);
260 		for (j = i; j > 0 && sc->sc_bcl[j - 1] > value; j--)
261 			sc->sc_bcl[j] = sc->sc_bcl[j - 1];
262 		 sc->sc_bcl[j] = value;
263 	}
264 
265 err:
266 	aml_freevalue(&res);
267 }
268 
269 
270 int
271 acpivout_get_param(struct wsdisplay_param *dp)
272 {
273 	struct acpivout_softc	*sc = NULL;
274 	int i;
275 
276 	switch (dp->param) {
277 	case WSDISPLAYIO_PARAM_BRIGHTNESS:
278 		for (i = 0; i < acpivout_cd.cd_ndevs; i++) {
279 			if (acpivout_cd.cd_devs[i] == NULL)
280 				continue;
281 			sc = (struct acpivout_softc *)acpivout_cd.cd_devs[i];
282 			/* Ignore device if not connected. */
283 			if (sc->sc_bcl_len != 0)
284 				break;
285 		}
286 		if (sc != NULL && sc->sc_bcl_len != 0) {
287 			dp->min = 0;
288 			dp->max = sc->sc_bcl[sc->sc_bcl_len - 1];
289 			dp->curval = sc->sc_brightness;
290 			return 0;
291 		}
292 		return -1;
293 	default:
294 		return -1;
295 	}
296 }
297 
298 int
299 acpivout_set_param(struct wsdisplay_param *dp)
300 {
301 	struct acpivout_softc	*sc = NULL;
302 	int i, nindex;
303 
304 	switch (dp->param) {
305 	case WSDISPLAYIO_PARAM_BRIGHTNESS:
306 		for (i = 0; i < acpivout_cd.cd_ndevs; i++) {
307 			if (acpivout_cd.cd_devs[i] == NULL)
308 				continue;
309 			sc = (struct acpivout_softc *)acpivout_cd.cd_devs[i];
310 			/* Ignore device if not connected. */
311 			if (sc->sc_bcl_len != 0)
312 				break;
313 		}
314 		if (sc != NULL && sc->sc_bcl_len != 0) {
315 			nindex = acpivout_select_brightness(sc, dp->curval);
316 			sc->sc_brightness = sc->sc_bcl[nindex];
317 			acpi_addtask(sc->sc_acpi,
318 			    acpivout_set_brightness, sc, 0);
319 			acpi_wakeup(sc->sc_acpi);
320 			return 0;
321 		}
322 		return -1;
323 	default:
324 		return -1;
325 	}
326 }
327