1 // SPDX-License-Identifier: GPL-2.0+ 2 /* 3 * Copyright (C) 2018-2019, Bridge Systems BV 4 * Copyright (C) 2018-2019, Bootlin 5 * Copyright (C) 2017, Free Electrons 6 * 7 * This file based on panel-ilitek-ili9881c.c 8 */ 9 10 #include <linux/delay.h> 11 #include <linux/device.h> 12 #include <linux/err.h> 13 #include <linux/errno.h> 14 #include <linux/fb.h> 15 #include <linux/kernel.h> 16 #include <linux/media-bus-format.h> 17 #include <linux/module.h> 18 19 #include <linux/gpio/consumer.h> 20 #include <linux/regulator/consumer.h> 21 22 #include <drm/drm_connector.h> 23 #include <drm/drm_mipi_dsi.h> 24 #include <drm/drm_modes.h> 25 #include <drm/drm_panel.h> 26 27 struct rb070d30_panel { 28 struct drm_panel panel; 29 struct mipi_dsi_device *dsi; 30 struct regulator *supply; 31 32 struct { 33 struct gpio_desc *power; 34 struct gpio_desc *reset; 35 struct gpio_desc *updn; 36 struct gpio_desc *shlr; 37 } gpios; 38 }; 39 40 static inline struct rb070d30_panel *panel_to_rb070d30_panel(struct drm_panel *panel) 41 { 42 return container_of(panel, struct rb070d30_panel, panel); 43 } 44 45 static int rb070d30_panel_prepare(struct drm_panel *panel) 46 { 47 struct rb070d30_panel *ctx = panel_to_rb070d30_panel(panel); 48 int ret; 49 50 ret = regulator_enable(ctx->supply); 51 if (ret < 0) { 52 dev_err(&ctx->dsi->dev, "Failed to enable supply: %d\n", ret); 53 return ret; 54 } 55 56 msleep(20); 57 gpiod_set_value(ctx->gpios.power, 1); 58 msleep(20); 59 gpiod_set_value(ctx->gpios.reset, 1); 60 msleep(20); 61 return 0; 62 } 63 64 static int rb070d30_panel_unprepare(struct drm_panel *panel) 65 { 66 struct rb070d30_panel *ctx = panel_to_rb070d30_panel(panel); 67 68 gpiod_set_value(ctx->gpios.reset, 0); 69 gpiod_set_value(ctx->gpios.power, 0); 70 regulator_disable(ctx->supply); 71 72 return 0; 73 } 74 75 static int rb070d30_panel_enable(struct drm_panel *panel) 76 { 77 struct rb070d30_panel *ctx = panel_to_rb070d30_panel(panel); 78 int ret; 79 80 ret = mipi_dsi_dcs_exit_sleep_mode(ctx->dsi); 81 if (ret) 82 return ret; 83 84 return 0; 85 } 86 87 static int rb070d30_panel_disable(struct drm_panel *panel) 88 { 89 struct rb070d30_panel *ctx = panel_to_rb070d30_panel(panel); 90 91 return mipi_dsi_dcs_enter_sleep_mode(ctx->dsi); 92 } 93 94 /* Default timings */ 95 static const struct drm_display_mode default_mode = { 96 .clock = 51206, 97 .hdisplay = 1024, 98 .hsync_start = 1024 + 160, 99 .hsync_end = 1024 + 160 + 80, 100 .htotal = 1024 + 160 + 80 + 80, 101 .vdisplay = 600, 102 .vsync_start = 600 + 12, 103 .vsync_end = 600 + 12 + 10, 104 .vtotal = 600 + 12 + 10 + 13, 105 106 .width_mm = 154, 107 .height_mm = 85, 108 }; 109 110 static int rb070d30_panel_get_modes(struct drm_panel *panel, 111 struct drm_connector *connector) 112 { 113 struct rb070d30_panel *ctx = panel_to_rb070d30_panel(panel); 114 struct drm_display_mode *mode; 115 static const u32 bus_format = MEDIA_BUS_FMT_RGB888_1X24; 116 117 mode = drm_mode_duplicate(connector->dev, &default_mode); 118 if (!mode) { 119 dev_err(&ctx->dsi->dev, "Failed to add mode " DRM_MODE_FMT "\n", 120 DRM_MODE_ARG(&default_mode)); 121 return -EINVAL; 122 } 123 124 drm_mode_set_name(mode); 125 126 mode->type = DRM_MODE_TYPE_DRIVER | DRM_MODE_TYPE_PREFERRED; 127 drm_mode_probed_add(connector, mode); 128 129 connector->display_info.bpc = 8; 130 connector->display_info.width_mm = mode->width_mm; 131 connector->display_info.height_mm = mode->height_mm; 132 drm_display_info_set_bus_formats(&connector->display_info, 133 &bus_format, 1); 134 135 return 1; 136 } 137 138 static const struct drm_panel_funcs rb070d30_panel_funcs = { 139 .get_modes = rb070d30_panel_get_modes, 140 .prepare = rb070d30_panel_prepare, 141 .enable = rb070d30_panel_enable, 142 .disable = rb070d30_panel_disable, 143 .unprepare = rb070d30_panel_unprepare, 144 }; 145 146 static int rb070d30_panel_dsi_probe(struct mipi_dsi_device *dsi) 147 { 148 struct rb070d30_panel *ctx; 149 int ret; 150 151 ctx = devm_kzalloc(&dsi->dev, sizeof(*ctx), GFP_KERNEL); 152 if (!ctx) 153 return -ENOMEM; 154 155 ctx->supply = devm_regulator_get(&dsi->dev, "vcc-lcd"); 156 if (IS_ERR(ctx->supply)) 157 return PTR_ERR(ctx->supply); 158 159 mipi_dsi_set_drvdata(dsi, ctx); 160 ctx->dsi = dsi; 161 162 drm_panel_init(&ctx->panel, &dsi->dev, &rb070d30_panel_funcs, 163 DRM_MODE_CONNECTOR_DSI); 164 165 ctx->gpios.reset = devm_gpiod_get(&dsi->dev, "reset", GPIOD_OUT_LOW); 166 if (IS_ERR(ctx->gpios.reset)) { 167 dev_err(&dsi->dev, "Couldn't get our reset GPIO\n"); 168 return PTR_ERR(ctx->gpios.reset); 169 } 170 171 ctx->gpios.power = devm_gpiod_get(&dsi->dev, "power", GPIOD_OUT_LOW); 172 if (IS_ERR(ctx->gpios.power)) { 173 dev_err(&dsi->dev, "Couldn't get our power GPIO\n"); 174 return PTR_ERR(ctx->gpios.power); 175 } 176 177 /* 178 * We don't change the state of that GPIO later on but we need 179 * to force it into a low state. 180 */ 181 ctx->gpios.updn = devm_gpiod_get(&dsi->dev, "updn", GPIOD_OUT_LOW); 182 if (IS_ERR(ctx->gpios.updn)) { 183 dev_err(&dsi->dev, "Couldn't get our updn GPIO\n"); 184 return PTR_ERR(ctx->gpios.updn); 185 } 186 187 /* 188 * We don't change the state of that GPIO later on but we need 189 * to force it into a low state. 190 */ 191 ctx->gpios.shlr = devm_gpiod_get(&dsi->dev, "shlr", GPIOD_OUT_LOW); 192 if (IS_ERR(ctx->gpios.shlr)) { 193 dev_err(&dsi->dev, "Couldn't get our shlr GPIO\n"); 194 return PTR_ERR(ctx->gpios.shlr); 195 } 196 197 ret = drm_panel_of_backlight(&ctx->panel); 198 if (ret) 199 return ret; 200 201 drm_panel_add(&ctx->panel); 202 203 dsi->mode_flags = MIPI_DSI_MODE_VIDEO | MIPI_DSI_MODE_VIDEO_BURST | MIPI_DSI_MODE_LPM; 204 dsi->format = MIPI_DSI_FMT_RGB888; 205 dsi->lanes = 4; 206 207 return mipi_dsi_attach(dsi); 208 } 209 210 static int rb070d30_panel_dsi_remove(struct mipi_dsi_device *dsi) 211 { 212 struct rb070d30_panel *ctx = mipi_dsi_get_drvdata(dsi); 213 214 mipi_dsi_detach(dsi); 215 drm_panel_remove(&ctx->panel); 216 217 return 0; 218 } 219 220 static const struct of_device_id rb070d30_panel_of_match[] = { 221 { .compatible = "ronbo,rb070d30" }, 222 { /* sentinel */ }, 223 }; 224 MODULE_DEVICE_TABLE(of, rb070d30_panel_of_match); 225 226 static struct mipi_dsi_driver rb070d30_panel_driver = { 227 .probe = rb070d30_panel_dsi_probe, 228 .remove = rb070d30_panel_dsi_remove, 229 .driver = { 230 .name = "panel-ronbo-rb070d30", 231 .of_match_table = rb070d30_panel_of_match, 232 }, 233 }; 234 module_mipi_dsi_driver(rb070d30_panel_driver); 235 236 MODULE_AUTHOR("Boris Brezillon <boris.brezillon@bootlin.com>"); 237 MODULE_AUTHOR("Konstantin Sudakov <k.sudakov@integrasources.com>"); 238 MODULE_DESCRIPTION("Ronbo RB070D30 Panel Driver"); 239 MODULE_LICENSE("GPL"); 240