1/* $NetBSD: fdt_panel.c,v 1.6 2021/12/19 11:01:10 riastradh 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 1.6 2021/12/19 11:01:10 riastradh Exp $");
31
32#include <sys/param.h>
33#include <sys/bus.h>
34#include <sys/device.h>
35#include <sys/gpio.h>
36#include <sys/systm.h>
37
38#include <dev/fdt/fdt_port.h>
39#include <dev/fdt/fdtvar.h>
40
41#include <dev/i2c/ddcvar.h>
42
43#include <drm/drm_drv.h>
44#include <drm/drm_edid.h>
45#include <drm/drm_panel.h>
46
47static const struct device_compatible_entry compat_data[] = {
48	{ .compat = "simple-panel" },
49	{ .compat = "boe,nv140fhmn49" },
50	DEVICE_COMPAT_EOL
51};
52
53struct panel_fdt_softc {
54	device_t			sc_dev;
55	struct fdt_device_ports		sc_ports;
56	struct drm_panel		sc_panel;
57	struct fdtbus_gpio_pin *	sc_enable;
58	struct fdtbus_regulator *	sc_regulator;
59};
60
61#define	to_panel_fdt(x)	container_of(x, struct panel_fdt_softc, sc_panel)
62
63static int
64panel_fdt_enable(struct drm_panel * panel)
65{
66	struct panel_fdt_softc * const sc = to_panel_fdt(panel);
67
68        if (sc->sc_enable) {
69		fdtbus_gpio_write(sc->sc_enable, true);
70        }
71
72	if (!cold)
73		kpause("panele", false, mstohz(200), NULL);
74
75	return 0;
76}
77
78static int
79panel_fdt_prepare(struct drm_panel * panel)
80{
81	struct panel_fdt_softc * const sc = to_panel_fdt(panel);
82
83        if (sc->sc_regulator) {
84                fdtbus_regulator_enable(sc->sc_regulator);
85        }
86
87	if (cold)
88		delay(210000);
89	else
90		kpause("panelp", false, mstohz(210), NULL);
91
92	return 0;
93}
94
95static const struct drm_panel_funcs panel_fdt_funcs = {
96	.disable = NULL,
97	.enable = panel_fdt_enable,
98	.get_modes = NULL,
99	.get_timings = NULL,
100	.prepare = panel_fdt_prepare,
101	.unprepare = NULL,
102};
103
104static int
105panel_fdt_ep_activate(device_t dev, struct fdt_endpoint *ep, bool activate)
106{
107	struct fdt_endpoint *rep = fdt_endpoint_remote(ep);
108
109	if (fdt_endpoint_port_index(ep) != 0)
110		return EINVAL;
111
112	if (fdt_endpoint_type(rep) != EP_DRM_ENCODER)
113		return EINVAL;
114
115	return 0;
116}
117
118static void *
119panel_fdt_ep_get_data(device_t dev, struct fdt_endpoint *ep)
120{
121	struct panel_fdt_softc * const sc = device_private(dev);
122
123	return &sc->sc_panel;
124}
125
126static int
127panel_fdt_match(device_t parent, cfdata_t cf, void *aux)
128{
129	struct fdt_attach_args * const faa = aux;
130
131	return of_compatible_match(faa->faa_phandle, compat_data);
132}
133
134static void
135panel_fdt_attach(device_t parent, device_t self, void *aux)
136{
137	struct panel_fdt_softc * const sc = device_private(self);
138	struct fdt_attach_args * const faa = aux;
139	const int phandle = faa->faa_phandle;
140
141	aprint_naive("\n");
142	aprint_normal(": panel\n");
143
144	sc->sc_dev = self;
145
146	/* required for "simple-panel" */
147        sc->sc_regulator = fdtbus_regulator_acquire(phandle, "power-supply");
148        if (sc->sc_regulator == NULL) {
149		aprint_error_dev(self, "regulator not found\n");
150		return;
151	}
152
153	/* optional for "simple-panel" */
154	sc->sc_enable = fdtbus_gpio_acquire_index(phandle,
155	    "enable-gpios", 0, GPIO_PIN_OUTPUT);
156
157	sc->sc_ports.dp_ep_activate = panel_fdt_ep_activate;
158	sc->sc_ports.dp_ep_get_data = panel_fdt_ep_get_data;
159	fdt_ports_register(&sc->sc_ports, self, phandle, EP_DRM_PANEL);
160
161	drm_panel_init(&sc->sc_panel, self, &panel_fdt_funcs, DRM_MODE_CONNECTOR_DPI);
162	sc->sc_panel.funcs = &panel_fdt_funcs;
163
164	drm_panel_add(&sc->sc_panel);
165}
166
167CFATTACH_DECL_NEW(panel_fdt, sizeof(struct panel_fdt_softc),
168	panel_fdt_match, panel_fdt_attach, NULL, NULL);
169