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 47 static const char * const compatible[] = { 48 "simple-panel", 49 NULL 50 }; 51 52 struct 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 62 static int 63 panel_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 77 static int 78 panel_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 94 static 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 }; 102 103 static int 104 panel_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 } 116 117 static void * 118 panel_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 } 124 125 static int 126 panel_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 } 132 133 static void 134 panel_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 } 161 162 CFATTACH_DECL_NEW(panel_fdt, sizeof(struct panel_fdt_softc), 163 panel_fdt_match, panel_fdt_attach, NULL, NULL); 164