1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * LG.Philips LB035Q02 LCD Panel driver 4 * 5 * Copyright (C) 2013 Texas Instruments 6 * Author: Tomi Valkeinen <tomi.valkeinen@ti.com> 7 * Based on a driver by: Steve Sakoman <steve@sakoman.com> 8 */ 9 10 #include <linux/module.h> 11 #include <linux/delay.h> 12 #include <linux/spi/spi.h> 13 #include <linux/mutex.h> 14 #include <linux/gpio.h> 15 16 #include <video/omapfb_dss.h> 17 18 static const struct omap_video_timings lb035q02_timings = { 19 .x_res = 320, 20 .y_res = 240, 21 22 .pixelclock = 6500000, 23 24 .hsw = 2, 25 .hfp = 20, 26 .hbp = 68, 27 28 .vsw = 2, 29 .vfp = 4, 30 .vbp = 18, 31 32 .vsync_level = OMAPDSS_SIG_ACTIVE_LOW, 33 .hsync_level = OMAPDSS_SIG_ACTIVE_LOW, 34 .data_pclk_edge = OMAPDSS_DRIVE_SIG_RISING_EDGE, 35 .de_level = OMAPDSS_SIG_ACTIVE_HIGH, 36 .sync_pclk_edge = OMAPDSS_DRIVE_SIG_FALLING_EDGE, 37 }; 38 39 struct panel_drv_data { 40 struct omap_dss_device dssdev; 41 struct omap_dss_device *in; 42 43 struct spi_device *spi; 44 45 int data_lines; 46 47 struct omap_video_timings videomode; 48 49 /* used for non-DT boot, to be removed */ 50 int backlight_gpio; 51 52 struct gpio_desc *enable_gpio; 53 }; 54 55 #define to_panel_data(p) container_of(p, struct panel_drv_data, dssdev) 56 57 static int lb035q02_write_reg(struct spi_device *spi, u8 reg, u16 val) 58 { 59 struct spi_message msg; 60 struct spi_transfer index_xfer = { 61 .len = 3, 62 .cs_change = 1, 63 }; 64 struct spi_transfer value_xfer = { 65 .len = 3, 66 }; 67 u8 buffer[16]; 68 69 spi_message_init(&msg); 70 71 /* register index */ 72 buffer[0] = 0x70; 73 buffer[1] = 0x00; 74 buffer[2] = reg & 0x7f; 75 index_xfer.tx_buf = buffer; 76 spi_message_add_tail(&index_xfer, &msg); 77 78 /* register value */ 79 buffer[4] = 0x72; 80 buffer[5] = val >> 8; 81 buffer[6] = val; 82 value_xfer.tx_buf = buffer + 4; 83 spi_message_add_tail(&value_xfer, &msg); 84 85 return spi_sync(spi, &msg); 86 } 87 88 static void init_lb035q02_panel(struct spi_device *spi) 89 { 90 /* Init sequence from page 28 of the lb035q02 spec */ 91 lb035q02_write_reg(spi, 0x01, 0x6300); 92 lb035q02_write_reg(spi, 0x02, 0x0200); 93 lb035q02_write_reg(spi, 0x03, 0x0177); 94 lb035q02_write_reg(spi, 0x04, 0x04c7); 95 lb035q02_write_reg(spi, 0x05, 0xffc0); 96 lb035q02_write_reg(spi, 0x06, 0xe806); 97 lb035q02_write_reg(spi, 0x0a, 0x4008); 98 lb035q02_write_reg(spi, 0x0b, 0x0000); 99 lb035q02_write_reg(spi, 0x0d, 0x0030); 100 lb035q02_write_reg(spi, 0x0e, 0x2800); 101 lb035q02_write_reg(spi, 0x0f, 0x0000); 102 lb035q02_write_reg(spi, 0x16, 0x9f80); 103 lb035q02_write_reg(spi, 0x17, 0x0a0f); 104 lb035q02_write_reg(spi, 0x1e, 0x00c1); 105 lb035q02_write_reg(spi, 0x30, 0x0300); 106 lb035q02_write_reg(spi, 0x31, 0x0007); 107 lb035q02_write_reg(spi, 0x32, 0x0000); 108 lb035q02_write_reg(spi, 0x33, 0x0000); 109 lb035q02_write_reg(spi, 0x34, 0x0707); 110 lb035q02_write_reg(spi, 0x35, 0x0004); 111 lb035q02_write_reg(spi, 0x36, 0x0302); 112 lb035q02_write_reg(spi, 0x37, 0x0202); 113 lb035q02_write_reg(spi, 0x3a, 0x0a0d); 114 lb035q02_write_reg(spi, 0x3b, 0x0806); 115 } 116 117 static int lb035q02_connect(struct omap_dss_device *dssdev) 118 { 119 struct panel_drv_data *ddata = to_panel_data(dssdev); 120 struct omap_dss_device *in = ddata->in; 121 int r; 122 123 if (omapdss_device_is_connected(dssdev)) 124 return 0; 125 126 r = in->ops.dpi->connect(in, dssdev); 127 if (r) 128 return r; 129 130 init_lb035q02_panel(ddata->spi); 131 132 return 0; 133 } 134 135 static void lb035q02_disconnect(struct omap_dss_device *dssdev) 136 { 137 struct panel_drv_data *ddata = to_panel_data(dssdev); 138 struct omap_dss_device *in = ddata->in; 139 140 if (!omapdss_device_is_connected(dssdev)) 141 return; 142 143 in->ops.dpi->disconnect(in, dssdev); 144 } 145 146 static int lb035q02_enable(struct omap_dss_device *dssdev) 147 { 148 struct panel_drv_data *ddata = to_panel_data(dssdev); 149 struct omap_dss_device *in = ddata->in; 150 int r; 151 152 if (!omapdss_device_is_connected(dssdev)) 153 return -ENODEV; 154 155 if (omapdss_device_is_enabled(dssdev)) 156 return 0; 157 158 if (ddata->data_lines) 159 in->ops.dpi->set_data_lines(in, ddata->data_lines); 160 in->ops.dpi->set_timings(in, &ddata->videomode); 161 162 r = in->ops.dpi->enable(in); 163 if (r) 164 return r; 165 166 if (ddata->enable_gpio) 167 gpiod_set_value_cansleep(ddata->enable_gpio, 1); 168 169 if (gpio_is_valid(ddata->backlight_gpio)) 170 gpio_set_value_cansleep(ddata->backlight_gpio, 1); 171 172 dssdev->state = OMAP_DSS_DISPLAY_ACTIVE; 173 174 return 0; 175 } 176 177 static void lb035q02_disable(struct omap_dss_device *dssdev) 178 { 179 struct panel_drv_data *ddata = to_panel_data(dssdev); 180 struct omap_dss_device *in = ddata->in; 181 182 if (!omapdss_device_is_enabled(dssdev)) 183 return; 184 185 if (ddata->enable_gpio) 186 gpiod_set_value_cansleep(ddata->enable_gpio, 0); 187 188 if (gpio_is_valid(ddata->backlight_gpio)) 189 gpio_set_value_cansleep(ddata->backlight_gpio, 0); 190 191 in->ops.dpi->disable(in); 192 193 dssdev->state = OMAP_DSS_DISPLAY_DISABLED; 194 } 195 196 static void lb035q02_set_timings(struct omap_dss_device *dssdev, 197 struct omap_video_timings *timings) 198 { 199 struct panel_drv_data *ddata = to_panel_data(dssdev); 200 struct omap_dss_device *in = ddata->in; 201 202 ddata->videomode = *timings; 203 dssdev->panel.timings = *timings; 204 205 in->ops.dpi->set_timings(in, timings); 206 } 207 208 static void lb035q02_get_timings(struct omap_dss_device *dssdev, 209 struct omap_video_timings *timings) 210 { 211 struct panel_drv_data *ddata = to_panel_data(dssdev); 212 213 *timings = ddata->videomode; 214 } 215 216 static int lb035q02_check_timings(struct omap_dss_device *dssdev, 217 struct omap_video_timings *timings) 218 { 219 struct panel_drv_data *ddata = to_panel_data(dssdev); 220 struct omap_dss_device *in = ddata->in; 221 222 return in->ops.dpi->check_timings(in, timings); 223 } 224 225 static struct omap_dss_driver lb035q02_ops = { 226 .connect = lb035q02_connect, 227 .disconnect = lb035q02_disconnect, 228 229 .enable = lb035q02_enable, 230 .disable = lb035q02_disable, 231 232 .set_timings = lb035q02_set_timings, 233 .get_timings = lb035q02_get_timings, 234 .check_timings = lb035q02_check_timings, 235 236 .get_resolution = omapdss_default_get_resolution, 237 }; 238 239 static int lb035q02_probe_of(struct spi_device *spi) 240 { 241 struct device_node *node = spi->dev.of_node; 242 struct panel_drv_data *ddata = dev_get_drvdata(&spi->dev); 243 struct omap_dss_device *in; 244 struct gpio_desc *gpio; 245 246 gpio = devm_gpiod_get(&spi->dev, "enable", GPIOD_OUT_LOW); 247 if (IS_ERR(gpio)) { 248 dev_err(&spi->dev, "failed to parse enable gpio\n"); 249 return PTR_ERR(gpio); 250 } 251 252 ddata->enable_gpio = gpio; 253 254 ddata->backlight_gpio = -ENOENT; 255 256 in = omapdss_of_find_source_for_first_ep(node); 257 if (IS_ERR(in)) { 258 dev_err(&spi->dev, "failed to find video source\n"); 259 return PTR_ERR(in); 260 } 261 262 ddata->in = in; 263 264 return 0; 265 } 266 267 static int lb035q02_panel_spi_probe(struct spi_device *spi) 268 { 269 struct panel_drv_data *ddata; 270 struct omap_dss_device *dssdev; 271 int r; 272 273 if (!spi->dev.of_node) 274 return -ENODEV; 275 276 ddata = devm_kzalloc(&spi->dev, sizeof(*ddata), GFP_KERNEL); 277 if (ddata == NULL) 278 return -ENOMEM; 279 280 dev_set_drvdata(&spi->dev, ddata); 281 282 ddata->spi = spi; 283 284 r = lb035q02_probe_of(spi); 285 if (r) 286 return r; 287 288 if (gpio_is_valid(ddata->backlight_gpio)) { 289 r = devm_gpio_request_one(&spi->dev, ddata->backlight_gpio, 290 GPIOF_OUT_INIT_LOW, "panel backlight"); 291 if (r) 292 goto err_gpio; 293 } 294 295 ddata->videomode = lb035q02_timings; 296 297 dssdev = &ddata->dssdev; 298 dssdev->dev = &spi->dev; 299 dssdev->driver = &lb035q02_ops; 300 dssdev->type = OMAP_DISPLAY_TYPE_DPI; 301 dssdev->owner = THIS_MODULE; 302 dssdev->panel.timings = ddata->videomode; 303 dssdev->phy.dpi.data_lines = ddata->data_lines; 304 305 r = omapdss_register_display(dssdev); 306 if (r) { 307 dev_err(&spi->dev, "Failed to register panel\n"); 308 goto err_reg; 309 } 310 311 return 0; 312 313 err_reg: 314 err_gpio: 315 omap_dss_put_device(ddata->in); 316 return r; 317 } 318 319 static int lb035q02_panel_spi_remove(struct spi_device *spi) 320 { 321 struct panel_drv_data *ddata = dev_get_drvdata(&spi->dev); 322 struct omap_dss_device *dssdev = &ddata->dssdev; 323 struct omap_dss_device *in = ddata->in; 324 325 omapdss_unregister_display(dssdev); 326 327 lb035q02_disable(dssdev); 328 lb035q02_disconnect(dssdev); 329 330 omap_dss_put_device(in); 331 332 return 0; 333 } 334 335 static const struct of_device_id lb035q02_of_match[] = { 336 { .compatible = "omapdss,lgphilips,lb035q02", }, 337 {}, 338 }; 339 340 MODULE_DEVICE_TABLE(of, lb035q02_of_match); 341 342 static struct spi_driver lb035q02_spi_driver = { 343 .probe = lb035q02_panel_spi_probe, 344 .remove = lb035q02_panel_spi_remove, 345 .driver = { 346 .name = "panel_lgphilips_lb035q02", 347 .of_match_table = lb035q02_of_match, 348 .suppress_bind_attrs = true, 349 }, 350 }; 351 352 module_spi_driver(lb035q02_spi_driver); 353 354 MODULE_ALIAS("spi:lgphilips,lb035q02"); 355 MODULE_AUTHOR("Tomi Valkeinen <tomi.valkeinen@ti.com>"); 356 MODULE_DESCRIPTION("LG.Philips LB035Q02 LCD Panel driver"); 357 MODULE_LICENSE("GPL"); 358