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