1 /* 2 * ld9040 AMOLED LCD drm_panel driver. 3 * 4 * Copyright (c) 2014 Samsung Electronics Co., Ltd 5 * Derived from drivers/video/backlight/ld9040.c 6 * 7 * Andrzej Hajda <a.hajda@samsung.com> 8 * 9 * This program is free software; you can redistribute it and/or modify 10 * it under the terms of the GNU General Public License version 2 as 11 * published by the Free Software Foundation. 12 */ 13 14 #include <linux/delay.h> 15 #include <linux/gpio/consumer.h> 16 #include <linux/module.h> 17 #include <linux/of.h> 18 #include <linux/regulator/consumer.h> 19 #include <linux/spi/spi.h> 20 21 #include <video/mipi_display.h> 22 #include <video/of_videomode.h> 23 #include <video/videomode.h> 24 25 #include <drm/drm_modes.h> 26 #include <drm/drm_panel.h> 27 #include <drm/drm_print.h> 28 29 /* Manufacturer Command Set */ 30 #define MCS_MANPWR 0xb0 31 #define MCS_ELVSS_ON 0xb1 32 #define MCS_USER_SETTING 0xf0 33 #define MCS_DISPCTL 0xf2 34 #define MCS_POWER_CTRL 0xf4 35 #define MCS_GTCON 0xf7 36 #define MCS_PANEL_CONDITION 0xf8 37 #define MCS_GAMMA_SET1 0xf9 38 #define MCS_GAMMA_CTRL 0xfb 39 40 /* array of gamma tables for gamma value 2.2 */ 41 static u8 const ld9040_gammas[25][22] = { 42 { 0xf9, 0x00, 0x13, 0xb2, 0xba, 0xd2, 0x00, 0x30, 0x00, 0xaf, 0xc0, 43 0xb8, 0xcd, 0x00, 0x3d, 0x00, 0xa8, 0xb8, 0xb7, 0xcd, 0x00, 0x44 }, 44 { 0xf9, 0x00, 0x13, 0xb9, 0xb9, 0xd0, 0x00, 0x3c, 0x00, 0xaf, 0xbf, 45 0xb6, 0xcb, 0x00, 0x4b, 0x00, 0xa8, 0xb9, 0xb5, 0xcc, 0x00, 0x52 }, 46 { 0xf9, 0x00, 0x13, 0xba, 0xb9, 0xcd, 0x00, 0x41, 0x00, 0xb0, 0xbe, 47 0xb5, 0xc9, 0x00, 0x51, 0x00, 0xa9, 0xb9, 0xb5, 0xca, 0x00, 0x57 }, 48 { 0xf9, 0x00, 0x13, 0xb9, 0xb8, 0xcd, 0x00, 0x46, 0x00, 0xb1, 0xbc, 49 0xb5, 0xc8, 0x00, 0x56, 0x00, 0xaa, 0xb8, 0xb4, 0xc9, 0x00, 0x5d }, 50 { 0xf9, 0x00, 0x13, 0xba, 0xb8, 0xcb, 0x00, 0x4b, 0x00, 0xb3, 0xbc, 51 0xb4, 0xc7, 0x00, 0x5c, 0x00, 0xac, 0xb8, 0xb4, 0xc8, 0x00, 0x62 }, 52 { 0xf9, 0x00, 0x13, 0xbb, 0xb7, 0xca, 0x00, 0x4f, 0x00, 0xb4, 0xbb, 53 0xb3, 0xc7, 0x00, 0x60, 0x00, 0xad, 0xb8, 0xb4, 0xc7, 0x00, 0x67 }, 54 { 0xf9, 0x00, 0x47, 0xba, 0xb6, 0xca, 0x00, 0x53, 0x00, 0xb5, 0xbb, 55 0xb3, 0xc6, 0x00, 0x65, 0x00, 0xae, 0xb8, 0xb3, 0xc7, 0x00, 0x6c }, 56 { 0xf9, 0x00, 0x71, 0xbb, 0xb5, 0xc8, 0x00, 0x57, 0x00, 0xb5, 0xbb, 57 0xb0, 0xc5, 0x00, 0x6a, 0x00, 0xae, 0xb9, 0xb1, 0xc6, 0x00, 0x70 }, 58 { 0xf9, 0x00, 0x7b, 0xbb, 0xb4, 0xc8, 0x00, 0x5b, 0x00, 0xb5, 0xba, 59 0xb1, 0xc4, 0x00, 0x6e, 0x00, 0xae, 0xb9, 0xb0, 0xc5, 0x00, 0x75 }, 60 { 0xf9, 0x00, 0x82, 0xba, 0xb4, 0xc7, 0x00, 0x5f, 0x00, 0xb5, 0xba, 61 0xb0, 0xc3, 0x00, 0x72, 0x00, 0xae, 0xb8, 0xb0, 0xc3, 0x00, 0x7a }, 62 { 0xf9, 0x00, 0x89, 0xba, 0xb3, 0xc8, 0x00, 0x62, 0x00, 0xb6, 0xba, 63 0xaf, 0xc3, 0x00, 0x76, 0x00, 0xaf, 0xb7, 0xae, 0xc4, 0x00, 0x7e }, 64 { 0xf9, 0x00, 0x8b, 0xb9, 0xb3, 0xc7, 0x00, 0x65, 0x00, 0xb7, 0xb8, 65 0xaf, 0xc3, 0x00, 0x7a, 0x00, 0x80, 0xb6, 0xae, 0xc4, 0x00, 0x81 }, 66 { 0xf9, 0x00, 0x93, 0xba, 0xb3, 0xc5, 0x00, 0x69, 0x00, 0xb8, 0xb9, 67 0xae, 0xc1, 0x00, 0x7f, 0x00, 0xb0, 0xb6, 0xae, 0xc3, 0x00, 0x85 }, 68 { 0xf9, 0x00, 0x97, 0xba, 0xb2, 0xc5, 0x00, 0x6c, 0x00, 0xb8, 0xb8, 69 0xae, 0xc1, 0x00, 0x82, 0x00, 0xb0, 0xb6, 0xae, 0xc2, 0x00, 0x89 }, 70 { 0xf9, 0x00, 0x9a, 0xba, 0xb1, 0xc4, 0x00, 0x6f, 0x00, 0xb8, 0xb8, 71 0xad, 0xc0, 0x00, 0x86, 0x00, 0xb0, 0xb7, 0xad, 0xc0, 0x00, 0x8d }, 72 { 0xf9, 0x00, 0x9c, 0xb9, 0xb0, 0xc4, 0x00, 0x72, 0x00, 0xb8, 0xb8, 73 0xac, 0xbf, 0x00, 0x8a, 0x00, 0xb0, 0xb6, 0xac, 0xc0, 0x00, 0x91 }, 74 { 0xf9, 0x00, 0x9e, 0xba, 0xb0, 0xc2, 0x00, 0x75, 0x00, 0xb9, 0xb8, 75 0xab, 0xbe, 0x00, 0x8e, 0x00, 0xb0, 0xb6, 0xac, 0xbf, 0x00, 0x94 }, 76 { 0xf9, 0x00, 0xa0, 0xb9, 0xaf, 0xc3, 0x00, 0x77, 0x00, 0xb9, 0xb7, 77 0xab, 0xbe, 0x00, 0x90, 0x00, 0xb0, 0xb6, 0xab, 0xbf, 0x00, 0x97 }, 78 { 0xf9, 0x00, 0xa2, 0xb9, 0xaf, 0xc2, 0x00, 0x7a, 0x00, 0xb9, 0xb7, 79 0xaa, 0xbd, 0x00, 0x94, 0x00, 0xb0, 0xb5, 0xab, 0xbf, 0x00, 0x9a }, 80 { 0xf9, 0x00, 0xa4, 0xb9, 0xaf, 0xc1, 0x00, 0x7d, 0x00, 0xb9, 0xb6, 81 0xaa, 0xbb, 0x00, 0x97, 0x00, 0xb1, 0xb5, 0xaa, 0xbf, 0x00, 0x9d }, 82 { 0xf9, 0x00, 0xa4, 0xb8, 0xb0, 0xbf, 0x00, 0x80, 0x00, 0xb8, 0xb6, 83 0xaa, 0xbc, 0x00, 0x9a, 0x00, 0xb0, 0xb5, 0xab, 0xbd, 0x00, 0xa0 }, 84 { 0xf9, 0x00, 0xa8, 0xb8, 0xae, 0xbe, 0x00, 0x84, 0x00, 0xb9, 0xb7, 85 0xa8, 0xbc, 0x00, 0x9d, 0x00, 0xb2, 0xb5, 0xaa, 0xbc, 0x00, 0xa4 }, 86 { 0xf9, 0x00, 0xa9, 0xb6, 0xad, 0xbf, 0x00, 0x86, 0x00, 0xb8, 0xb5, 87 0xa8, 0xbc, 0x00, 0xa0, 0x00, 0xb3, 0xb3, 0xa9, 0xbc, 0x00, 0xa7 }, 88 { 0xf9, 0x00, 0xa9, 0xb7, 0xae, 0xbd, 0x00, 0x89, 0x00, 0xb7, 0xb6, 89 0xa8, 0xba, 0x00, 0xa4, 0x00, 0xb1, 0xb4, 0xaa, 0xbb, 0x00, 0xaa }, 90 { 0xf9, 0x00, 0xa7, 0xb4, 0xae, 0xbf, 0x00, 0x91, 0x00, 0xb2, 0xb4, 91 0xaa, 0xbb, 0x00, 0xac, 0x00, 0xb3, 0xb1, 0xaa, 0xbc, 0x00, 0xb3 }, 92 }; 93 94 struct ld9040 { 95 struct device *dev; 96 struct drm_panel panel; 97 98 struct regulator_bulk_data supplies[2]; 99 struct gpio_desc *reset_gpio; 100 u32 power_on_delay; 101 u32 reset_delay; 102 struct videomode vm; 103 u32 width_mm; 104 u32 height_mm; 105 106 int brightness; 107 108 /* This field is tested by functions directly accessing bus before 109 * transfer, transfer is skipped if it is set. In case of transfer 110 * failure or unexpected response the field is set to error value. 111 * Such construct allows to eliminate many checks in higher level 112 * functions. 113 */ 114 int error; 115 }; 116 117 static inline struct ld9040 *panel_to_ld9040(struct drm_panel *panel) 118 { 119 return container_of(panel, struct ld9040, panel); 120 } 121 122 static int ld9040_clear_error(struct ld9040 *ctx) 123 { 124 int ret = ctx->error; 125 126 ctx->error = 0; 127 return ret; 128 } 129 130 static int ld9040_spi_write_word(struct ld9040 *ctx, u16 data) 131 { 132 struct spi_device *spi = to_spi_device(ctx->dev); 133 struct spi_transfer xfer = { 134 .len = 2, 135 .tx_buf = &data, 136 }; 137 struct spi_message msg; 138 139 spi_message_init(&msg); 140 spi_message_add_tail(&xfer, &msg); 141 142 return spi_sync(spi, &msg); 143 } 144 145 static void ld9040_dcs_write(struct ld9040 *ctx, const u8 *data, size_t len) 146 { 147 int ret = 0; 148 149 if (ctx->error < 0 || len == 0) 150 return; 151 152 dev_dbg(ctx->dev, "writing dcs seq: %*ph\n", (int)len, data); 153 ret = ld9040_spi_write_word(ctx, *data); 154 155 while (!ret && --len) { 156 ++data; 157 ret = ld9040_spi_write_word(ctx, *data | 0x100); 158 } 159 160 if (ret) { 161 dev_err(ctx->dev, "error %d writing dcs seq: %*ph\n", ret, 162 (int)len, data); 163 ctx->error = ret; 164 } 165 166 usleep_range(300, 310); 167 } 168 169 #define ld9040_dcs_write_seq_static(ctx, seq...) \ 170 ({\ 171 static const u8 d[] = { seq };\ 172 ld9040_dcs_write(ctx, d, ARRAY_SIZE(d));\ 173 }) 174 175 static void ld9040_brightness_set(struct ld9040 *ctx) 176 { 177 ld9040_dcs_write(ctx, ld9040_gammas[ctx->brightness], 178 ARRAY_SIZE(ld9040_gammas[ctx->brightness])); 179 180 ld9040_dcs_write_seq_static(ctx, MCS_GAMMA_CTRL, 0x02, 0x5a); 181 } 182 183 static void ld9040_init(struct ld9040 *ctx) 184 { 185 ld9040_dcs_write_seq_static(ctx, MCS_USER_SETTING, 0x5a, 0x5a); 186 ld9040_dcs_write_seq_static(ctx, MCS_PANEL_CONDITION, 187 0x05, 0x65, 0x96, 0x71, 0x7d, 0x19, 0x3b, 0x0d, 188 0x19, 0x7e, 0x0d, 0xe2, 0x00, 0x00, 0x7e, 0x7d, 189 0x07, 0x07, 0x20, 0x20, 0x20, 0x02, 0x02); 190 ld9040_dcs_write_seq_static(ctx, MCS_DISPCTL, 191 0x02, 0x08, 0x08, 0x10, 0x10); 192 ld9040_dcs_write_seq_static(ctx, MCS_MANPWR, 0x04); 193 ld9040_dcs_write_seq_static(ctx, MCS_POWER_CTRL, 194 0x0a, 0x87, 0x25, 0x6a, 0x44, 0x02, 0x88); 195 ld9040_dcs_write_seq_static(ctx, MCS_ELVSS_ON, 0x0d, 0x00, 0x16); 196 ld9040_dcs_write_seq_static(ctx, MCS_GTCON, 0x09, 0x00, 0x00); 197 ld9040_brightness_set(ctx); 198 ld9040_dcs_write_seq_static(ctx, MIPI_DCS_EXIT_SLEEP_MODE); 199 ld9040_dcs_write_seq_static(ctx, MIPI_DCS_SET_DISPLAY_ON); 200 } 201 202 static int ld9040_power_on(struct ld9040 *ctx) 203 { 204 int ret; 205 206 ret = regulator_bulk_enable(ARRAY_SIZE(ctx->supplies), ctx->supplies); 207 if (ret < 0) 208 return ret; 209 210 msleep(ctx->power_on_delay); 211 gpiod_set_value(ctx->reset_gpio, 0); 212 msleep(ctx->reset_delay); 213 gpiod_set_value(ctx->reset_gpio, 1); 214 msleep(ctx->reset_delay); 215 216 return 0; 217 } 218 219 static int ld9040_power_off(struct ld9040 *ctx) 220 { 221 return regulator_bulk_disable(ARRAY_SIZE(ctx->supplies), ctx->supplies); 222 } 223 224 static int ld9040_disable(struct drm_panel *panel) 225 { 226 return 0; 227 } 228 229 static int ld9040_unprepare(struct drm_panel *panel) 230 { 231 struct ld9040 *ctx = panel_to_ld9040(panel); 232 233 msleep(120); 234 ld9040_dcs_write_seq_static(ctx, MIPI_DCS_SET_DISPLAY_OFF); 235 ld9040_dcs_write_seq_static(ctx, MIPI_DCS_ENTER_SLEEP_MODE); 236 msleep(40); 237 238 ld9040_clear_error(ctx); 239 240 return ld9040_power_off(ctx); 241 } 242 243 static int ld9040_prepare(struct drm_panel *panel) 244 { 245 struct ld9040 *ctx = panel_to_ld9040(panel); 246 int ret; 247 248 ret = ld9040_power_on(ctx); 249 if (ret < 0) 250 return ret; 251 252 ld9040_init(ctx); 253 254 ret = ld9040_clear_error(ctx); 255 256 if (ret < 0) 257 ld9040_unprepare(panel); 258 259 return ret; 260 } 261 262 static int ld9040_enable(struct drm_panel *panel) 263 { 264 return 0; 265 } 266 267 static int ld9040_get_modes(struct drm_panel *panel) 268 { 269 struct drm_connector *connector = panel->connector; 270 struct ld9040 *ctx = panel_to_ld9040(panel); 271 struct drm_display_mode *mode; 272 273 mode = drm_mode_create(connector->dev); 274 if (!mode) { 275 DRM_ERROR("failed to create a new display mode\n"); 276 return 0; 277 } 278 279 drm_display_mode_from_videomode(&ctx->vm, mode); 280 mode->width_mm = ctx->width_mm; 281 mode->height_mm = ctx->height_mm; 282 connector->display_info.width_mm = mode->width_mm; 283 connector->display_info.height_mm = mode->height_mm; 284 285 mode->type = DRM_MODE_TYPE_DRIVER | DRM_MODE_TYPE_PREFERRED; 286 drm_mode_probed_add(connector, mode); 287 288 return 1; 289 } 290 291 static const struct drm_panel_funcs ld9040_drm_funcs = { 292 .disable = ld9040_disable, 293 .unprepare = ld9040_unprepare, 294 .prepare = ld9040_prepare, 295 .enable = ld9040_enable, 296 .get_modes = ld9040_get_modes, 297 }; 298 299 static int ld9040_parse_dt(struct ld9040 *ctx) 300 { 301 struct device *dev = ctx->dev; 302 struct device_node *np = dev->of_node; 303 int ret; 304 305 ret = of_get_videomode(np, &ctx->vm, 0); 306 if (ret < 0) 307 return ret; 308 309 of_property_read_u32(np, "power-on-delay", &ctx->power_on_delay); 310 of_property_read_u32(np, "reset-delay", &ctx->reset_delay); 311 of_property_read_u32(np, "panel-width-mm", &ctx->width_mm); 312 of_property_read_u32(np, "panel-height-mm", &ctx->height_mm); 313 314 return 0; 315 } 316 317 static int ld9040_probe(struct spi_device *spi) 318 { 319 struct device *dev = &spi->dev; 320 struct ld9040 *ctx; 321 int ret; 322 323 ctx = devm_kzalloc(dev, sizeof(struct ld9040), GFP_KERNEL); 324 if (!ctx) 325 return -ENOMEM; 326 327 spi_set_drvdata(spi, ctx); 328 329 ctx->dev = dev; 330 ctx->brightness = ARRAY_SIZE(ld9040_gammas) - 1; 331 332 ret = ld9040_parse_dt(ctx); 333 if (ret < 0) 334 return ret; 335 336 ctx->supplies[0].supply = "vdd3"; 337 ctx->supplies[1].supply = "vci"; 338 ret = devm_regulator_bulk_get(dev, ARRAY_SIZE(ctx->supplies), 339 ctx->supplies); 340 if (ret < 0) 341 return ret; 342 343 ctx->reset_gpio = devm_gpiod_get(dev, "reset", GPIOD_OUT_HIGH); 344 if (IS_ERR(ctx->reset_gpio)) { 345 dev_err(dev, "cannot get reset-gpios %ld\n", 346 PTR_ERR(ctx->reset_gpio)); 347 return PTR_ERR(ctx->reset_gpio); 348 } 349 350 spi->bits_per_word = 9; 351 ret = spi_setup(spi); 352 if (ret < 0) { 353 dev_err(dev, "spi setup failed.\n"); 354 return ret; 355 } 356 357 drm_panel_init(&ctx->panel); 358 ctx->panel.dev = dev; 359 ctx->panel.funcs = &ld9040_drm_funcs; 360 361 return drm_panel_add(&ctx->panel); 362 } 363 364 static int ld9040_remove(struct spi_device *spi) 365 { 366 struct ld9040 *ctx = spi_get_drvdata(spi); 367 368 ld9040_power_off(ctx); 369 drm_panel_remove(&ctx->panel); 370 371 return 0; 372 } 373 374 static const struct of_device_id ld9040_of_match[] = { 375 { .compatible = "samsung,ld9040" }, 376 { } 377 }; 378 MODULE_DEVICE_TABLE(of, ld9040_of_match); 379 380 static struct spi_driver ld9040_driver = { 381 .probe = ld9040_probe, 382 .remove = ld9040_remove, 383 .driver = { 384 .name = "panel-samsung-ld9040", 385 .of_match_table = ld9040_of_match, 386 }, 387 }; 388 module_spi_driver(ld9040_driver); 389 390 MODULE_AUTHOR("Andrzej Hajda <a.hajda@samsung.com>"); 391 MODULE_DESCRIPTION("ld9040 LCD Driver"); 392 MODULE_LICENSE("GPL v2"); 393