1/*
2 * lws abstract display
3 *
4 * Copyright (C) 2019 - 2020 Andy Green <andy@warmcat.com>
5 *
6 * Permission is hereby granted, free of charge, to any person obtaining a copy
7 * of this software and associated documentation files (the "Software"), to
8 * deal in the Software without restriction, including without limitation the
9 * rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
10 * sell copies of the Software, and to permit persons to whom the Software is
11 * furnished to do so, subject to the following conditions:
12 *
13 * The above copyright notice and this permission notice shall be included in
14 * all copies or substantial portions of the Software.
15 *
16 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
17 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
18 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
19 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
20 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
21 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
22 * IN THE SOFTWARE.
23 */
24
25#include <libwebsockets.h>
26
27static void
28sul_autodim_cb(lws_sorted_usec_list_t *sul)
29{
30	lws_display_state_t *lds = lws_container_of(sul, lws_display_state_t,
31						    sul_autodim);
32	int next_ms = -1;
33
34	/* we fire both to dim and to blank... if already in dim state, blank */
35
36	switch (lds->state) {
37	case LWSDISPS_BECOMING_ACTIVE:
38		lws_display_state_set_brightness(lds, lds->disp->bl_active);
39		lds->state = LWSDISPS_ACTIVE;
40		next_ms = lds->autodim_ms;
41		break;
42
43	case LWSDISPS_ACTIVE:
44		/* active -> autodimmed */
45		lds->state = LWSDISPS_AUTODIMMED;
46		next_ms = lds->off_ms;
47		lws_display_state_set_brightness(lds, lds->disp->bl_dim);
48		break;
49
50	case LWSDISPS_AUTODIMMED:
51		/* dimmed -> OFF */
52		lws_display_state_set_brightness(lds, &lws_pwmseq_static_off);
53		lds->state = LWSDISPS_GOING_OFF;
54		next_ms = 600;
55		break;
56
57	case LWSDISPS_GOING_OFF:
58		/* off dimming completed, actual display OFF */
59		lws_display_state_off(lds);
60		return;
61
62	default:
63		return;
64	}
65
66	if (next_ms >= 0)
67		lws_sul_schedule(lds->ctx, 0, &lds->sul_autodim, sul_autodim_cb,
68				 next_ms * LWS_US_PER_MS);
69}
70
71void
72lws_display_state_init(lws_display_state_t *lds, struct lws_context *ctx,
73		       int dim_ms, int off_ms, struct lws_led_state *bl_lcs,
74		       const lws_display_t *disp)
75{
76	memset(lds, 0, sizeof(*lds));
77
78	lds->disp = disp;
79	lds->ctx = ctx;
80	lds->autodim_ms = dim_ms;
81	lds->off_ms = off_ms;
82	lds->bl_lcs = bl_lcs;
83	lds->state = LWSDISPS_OFF;
84
85	lws_led_transition(lds->bl_lcs, "backlight", &lws_pwmseq_static_off,
86						     &lws_pwmseq_static_on);
87
88	disp->init(disp);
89}
90
91void
92lws_display_state_set_brightness(lws_display_state_t *lds,
93				 const lws_led_sequence_def_t *pwmseq)
94{
95	lws_led_transition(lds->bl_lcs, "backlight", pwmseq,
96			   lds->disp->bl_transition);
97}
98
99void
100lws_display_state_active(lws_display_state_t *lds)
101{
102	int waiting_ms;
103
104	if (lds->state == LWSDISPS_OFF) {
105		/* power us up */
106		lds->disp->power(lds->disp, 1);
107		lds->state = LWSDISPS_BECOMING_ACTIVE;
108		waiting_ms = lds->disp->latency_wake_ms;
109	} else {
110
111		if (lds->state != LWSDISPS_ACTIVE)
112			lws_display_state_set_brightness(lds,
113						lds->disp->bl_active);
114
115		lds->state = LWSDISPS_ACTIVE;
116		waiting_ms = lds->autodim_ms;
117	}
118
119	/* reset the autodim timer */
120	if (waiting_ms >= 0)
121		lws_sul_schedule(lds->ctx, 0, &lds->sul_autodim, sul_autodim_cb,
122				 waiting_ms * LWS_US_PER_MS);
123
124}
125
126void
127lws_display_state_off(lws_display_state_t *lds)
128{
129	lds->disp->power(lds->disp, 0);
130	lws_sul_cancel(&lds->sul_autodim);
131	lds->state = LWSDISPS_OFF;
132}
133