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 47 static const struct device_compatible_entry compat_data[] = { 48 { .compat = "simple-panel" }, 49 { .compat = "boe,nv140fhmn49" }, 50 DEVICE_COMPAT_EOL 51 }; 52 53 struct 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 63 static int 64 panel_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 78 static int 79 panel_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 95 static 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 }; 103 104 static int 105 panel_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 } 117 118 static void * 119 panel_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 } 125 126 static int 127 panel_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 } 133 134 static void 135 panel_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 } 166 167 CFATTACH_DECL_NEW(panel_fdt, sizeof(struct panel_fdt_softc), 168 panel_fdt_match, panel_fdt_attach, NULL, NULL); 169