fdt_panel.c revision 1.1 
1/* $NetBSD: fdt_panel.c,v 1.1 2019/12/19 00:35:01 jakllsch Exp $ */
2
3/*-
4 * Copyright (c) 2019 Jonathan A. Kollasch <jakllsch@kollasch.net>
5 * All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 *    notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 *    notice, this list of conditions and the following disclaimer in the
14 *    documentation and/or other materials provided with the distribution.
15 *
16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
17 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
18 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
19 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
20 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
21 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
22 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
23 * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
24 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
25 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
26 * SUCH DAMAGE.
27 */
28
29#include <sys/cdefs.h>
30__KERNEL_RCSID(0, "$NetBSD: fdt_panel.c,v 1.1 2019/12/19 00:35:01 jakllsch Exp $");
31
32#include <sys/param.h>
33#include <sys/bus.h>
34#include <sys/device.h>
35#include <sys/systm.h>
36#include <sys/gpio.h>
37
38#include <dev/fdt/fdtvar.h>
39#include <dev/fdt/fdt_port.h>
40
41#include <dev/i2c/ddcvar.h>
42
43#include <drm/drmP.h>
44#include <drm/drm_panel.h>
45#include <drm/drm_edid.h>
46
47static const char * const compatible[] = {
48	"simple-panel",
49	NULL
50};
51
52struct panel_fdt_softc {
53	device_t			sc_dev;
54	struct fdt_device_ports		sc_ports;
55	struct drm_panel		sc_panel;
56	struct fdtbus_gpio_pin *	sc_enable;
57	struct fdtbus_regulator *	sc_regulator;
58};
59
60#define	to_panel_fdt(x)	container_of(x, struct panel_fdt_softc, sc_panel)
61
62static int
63panel_fdt_enable(struct drm_panel * panel)
64{
65	struct panel_fdt_softc * const sc = to_panel_fdt(panel);
66
67        if (sc->sc_enable) {
68		fdtbus_gpio_write(sc->sc_enable, true);
69        }
70
71	if (!cold)
72		kpause("panele", false, mstohz(200), NULL);
73
74	return 0;
75}
76
77static int
78panel_fdt_prepare(struct drm_panel * panel)
79{
80	struct panel_fdt_softc * const sc = to_panel_fdt(panel);
81
82        if (sc->sc_regulator) {
83                fdtbus_regulator_enable(sc->sc_regulator);
84        }
85
86	if (cold)
87		delay(210000);
88	else
89		kpause("panelp", false, mstohz(210), NULL);
90
91	return 0;
92}
93
94static const struct drm_panel_funcs panel_fdt_funcs = {
95	.disable = NULL,
96	.enable = panel_fdt_enable,
97	.get_modes = NULL,
98	.get_timings = NULL,
99	.prepare = panel_fdt_prepare,
100	.unprepare = NULL,
101};
102
103static int
104panel_fdt_ep_activate(device_t dev, struct fdt_endpoint *ep, bool activate)
105{
106	struct fdt_endpoint *rep = fdt_endpoint_remote(ep);
107
108	if (fdt_endpoint_port_index(ep) != 0)
109		return EINVAL;
110
111	if (fdt_endpoint_type(rep) != EP_DRM_ENCODER)
112		return EINVAL;
113
114	return 0;
115}
116
117static void *
118panel_fdt_ep_get_data(device_t dev, struct fdt_endpoint *ep)
119{
120	struct panel_fdt_softc * const sc = device_private(dev);
121
122	return &sc->sc_panel;
123}
124
125static int
126panel_fdt_match(device_t parent, cfdata_t cf, void *aux)
127{
128	struct fdt_attach_args * const faa = aux;
129
130	return of_match_compatible(faa->faa_phandle, compatible);
131}
132
133static void
134panel_fdt_attach(device_t parent, device_t self, void *aux)
135{
136	struct panel_fdt_softc * const sc = device_private(self);
137	struct fdt_attach_args * const faa = aux;
138	const int phandle = faa->faa_phandle;
139
140	aprint_naive("\n");
141	aprint_normal(": panel\n");
142
143	sc->sc_dev = self;
144
145	/* required for "simple-panel" */
146        sc->sc_regulator = fdtbus_regulator_acquire(phandle, "power-supply");
147
148	/* optional for "simple-panel" */
149	sc->sc_enable = fdtbus_gpio_acquire_index(phandle,
150	    "enable-gpios", 0, GPIO_PIN_OUTPUT);
151
152	sc->sc_ports.dp_ep_activate = panel_fdt_ep_activate;
153	sc->sc_ports.dp_ep_get_data = panel_fdt_ep_get_data;
154	fdt_ports_register(&sc->sc_ports, self, phandle, EP_DRM_PANEL);
155
156	drm_panel_init(&sc->sc_panel);
157	sc->sc_panel.funcs = &panel_fdt_funcs;
158
159	drm_panel_add(&sc->sc_panel);
160}
161
162CFATTACH_DECL_NEW(panel_fdt, sizeof(struct panel_fdt_softc),
163	panel_fdt_match, panel_fdt_attach, NULL, NULL);
164