1 /* 2 * LCD panel driver for Sharp LS037V7DW01 3 * 4 * Copyright (C) 2013 Texas Instruments 5 * Author: Tomi Valkeinen <tomi.valkeinen@ti.com> 6 * 7 * This program is free software; you can redistribute it and/or modify it 8 * under the terms of the GNU General Public License version 2 as published by 9 * the Free Software Foundation. 10 */ 11 12 #include <linux/delay.h> 13 #include <linux/gpio.h> 14 #include <linux/module.h> 15 #include <linux/of.h> 16 #include <linux/of_gpio.h> 17 #include <linux/platform_device.h> 18 #include <linux/slab.h> 19 #include <linux/regulator/consumer.h> 20 #include <video/omapdss.h> 21 #include <video/omap-panel-data.h> 22 23 struct panel_drv_data { 24 struct omap_dss_device dssdev; 25 struct omap_dss_device *in; 26 struct regulator *vcc; 27 28 int data_lines; 29 30 struct omap_video_timings videomode; 31 32 struct gpio_desc *resb_gpio; /* low = reset active min 20 us */ 33 struct gpio_desc *ini_gpio; /* high = power on */ 34 struct gpio_desc *mo_gpio; /* low = 480x640, high = 240x320 */ 35 struct gpio_desc *lr_gpio; /* high = conventional horizontal scanning */ 36 struct gpio_desc *ud_gpio; /* high = conventional vertical scanning */ 37 }; 38 39 static const struct omap_video_timings sharp_ls_timings = { 40 .x_res = 480, 41 .y_res = 640, 42 43 .pixelclock = 19200000, 44 45 .hsw = 2, 46 .hfp = 1, 47 .hbp = 28, 48 49 .vsw = 1, 50 .vfp = 1, 51 .vbp = 1, 52 53 .vsync_level = OMAPDSS_SIG_ACTIVE_LOW, 54 .hsync_level = OMAPDSS_SIG_ACTIVE_LOW, 55 .data_pclk_edge = OMAPDSS_DRIVE_SIG_RISING_EDGE, 56 .de_level = OMAPDSS_SIG_ACTIVE_HIGH, 57 .sync_pclk_edge = OMAPDSS_DRIVE_SIG_FALLING_EDGE, 58 }; 59 60 #define to_panel_data(p) container_of(p, struct panel_drv_data, dssdev) 61 62 static int sharp_ls_connect(struct omap_dss_device *dssdev) 63 { 64 struct panel_drv_data *ddata = to_panel_data(dssdev); 65 struct omap_dss_device *in = ddata->in; 66 int r; 67 68 if (omapdss_device_is_connected(dssdev)) 69 return 0; 70 71 r = in->ops.dpi->connect(in, dssdev); 72 if (r) 73 return r; 74 75 return 0; 76 } 77 78 static void sharp_ls_disconnect(struct omap_dss_device *dssdev) 79 { 80 struct panel_drv_data *ddata = to_panel_data(dssdev); 81 struct omap_dss_device *in = ddata->in; 82 83 if (!omapdss_device_is_connected(dssdev)) 84 return; 85 86 in->ops.dpi->disconnect(in, dssdev); 87 } 88 89 static int sharp_ls_enable(struct omap_dss_device *dssdev) 90 { 91 struct panel_drv_data *ddata = to_panel_data(dssdev); 92 struct omap_dss_device *in = ddata->in; 93 int r; 94 95 if (!omapdss_device_is_connected(dssdev)) 96 return -ENODEV; 97 98 if (omapdss_device_is_enabled(dssdev)) 99 return 0; 100 101 if (ddata->data_lines) 102 in->ops.dpi->set_data_lines(in, ddata->data_lines); 103 in->ops.dpi->set_timings(in, &ddata->videomode); 104 105 if (ddata->vcc) { 106 r = regulator_enable(ddata->vcc); 107 if (r != 0) 108 return r; 109 } 110 111 r = in->ops.dpi->enable(in); 112 if (r) { 113 regulator_disable(ddata->vcc); 114 return r; 115 } 116 117 /* wait couple of vsyncs until enabling the LCD */ 118 msleep(50); 119 120 if (ddata->resb_gpio) 121 gpiod_set_value_cansleep(ddata->resb_gpio, 1); 122 123 if (ddata->ini_gpio) 124 gpiod_set_value_cansleep(ddata->ini_gpio, 1); 125 126 dssdev->state = OMAP_DSS_DISPLAY_ACTIVE; 127 128 return 0; 129 } 130 131 static void sharp_ls_disable(struct omap_dss_device *dssdev) 132 { 133 struct panel_drv_data *ddata = to_panel_data(dssdev); 134 struct omap_dss_device *in = ddata->in; 135 136 if (!omapdss_device_is_enabled(dssdev)) 137 return; 138 139 if (ddata->ini_gpio) 140 gpiod_set_value_cansleep(ddata->ini_gpio, 0); 141 142 if (ddata->resb_gpio) 143 gpiod_set_value_cansleep(ddata->resb_gpio, 0); 144 145 /* wait at least 5 vsyncs after disabling the LCD */ 146 147 msleep(100); 148 149 in->ops.dpi->disable(in); 150 151 if (ddata->vcc) 152 regulator_disable(ddata->vcc); 153 154 dssdev->state = OMAP_DSS_DISPLAY_DISABLED; 155 } 156 157 static void sharp_ls_set_timings(struct omap_dss_device *dssdev, 158 struct omap_video_timings *timings) 159 { 160 struct panel_drv_data *ddata = to_panel_data(dssdev); 161 struct omap_dss_device *in = ddata->in; 162 163 ddata->videomode = *timings; 164 dssdev->panel.timings = *timings; 165 166 in->ops.dpi->set_timings(in, timings); 167 } 168 169 static void sharp_ls_get_timings(struct omap_dss_device *dssdev, 170 struct omap_video_timings *timings) 171 { 172 struct panel_drv_data *ddata = to_panel_data(dssdev); 173 174 *timings = ddata->videomode; 175 } 176 177 static int sharp_ls_check_timings(struct omap_dss_device *dssdev, 178 struct omap_video_timings *timings) 179 { 180 struct panel_drv_data *ddata = to_panel_data(dssdev); 181 struct omap_dss_device *in = ddata->in; 182 183 return in->ops.dpi->check_timings(in, timings); 184 } 185 186 static struct omap_dss_driver sharp_ls_ops = { 187 .connect = sharp_ls_connect, 188 .disconnect = sharp_ls_disconnect, 189 190 .enable = sharp_ls_enable, 191 .disable = sharp_ls_disable, 192 193 .set_timings = sharp_ls_set_timings, 194 .get_timings = sharp_ls_get_timings, 195 .check_timings = sharp_ls_check_timings, 196 197 .get_resolution = omapdss_default_get_resolution, 198 }; 199 200 static int sharp_ls_get_gpio(struct device *dev, int gpio, unsigned long flags, 201 char *desc, struct gpio_desc **gpiod) 202 { 203 struct gpio_desc *gd; 204 int r; 205 206 *gpiod = NULL; 207 208 r = devm_gpio_request_one(dev, gpio, flags, desc); 209 if (r) 210 return r == -ENOENT ? 0 : r; 211 212 gd = gpio_to_desc(gpio); 213 if (IS_ERR(gd)) 214 return PTR_ERR(gd) == -ENOENT ? 0 : PTR_ERR(gd); 215 216 *gpiod = gd; 217 return 0; 218 } 219 220 static int sharp_ls_probe_pdata(struct platform_device *pdev) 221 { 222 const struct panel_sharp_ls037v7dw01_platform_data *pdata; 223 struct panel_drv_data *ddata = platform_get_drvdata(pdev); 224 struct omap_dss_device *dssdev, *in; 225 int r; 226 227 pdata = dev_get_platdata(&pdev->dev); 228 229 in = omap_dss_find_output(pdata->source); 230 if (in == NULL) { 231 dev_err(&pdev->dev, "failed to find video source '%s'\n", 232 pdata->source); 233 return -EPROBE_DEFER; 234 } 235 236 ddata->in = in; 237 238 ddata->data_lines = pdata->data_lines; 239 240 dssdev = &ddata->dssdev; 241 dssdev->name = pdata->name; 242 243 r = sharp_ls_get_gpio(&pdev->dev, pdata->mo_gpio, GPIOF_OUT_INIT_LOW, 244 "lcd MO", &ddata->mo_gpio); 245 if (r) 246 return r; 247 r = sharp_ls_get_gpio(&pdev->dev, pdata->lr_gpio, GPIOF_OUT_INIT_HIGH, 248 "lcd LR", &ddata->lr_gpio); 249 if (r) 250 return r; 251 r = sharp_ls_get_gpio(&pdev->dev, pdata->ud_gpio, GPIOF_OUT_INIT_HIGH, 252 "lcd UD", &ddata->ud_gpio); 253 if (r) 254 return r; 255 r = sharp_ls_get_gpio(&pdev->dev, pdata->resb_gpio, GPIOF_OUT_INIT_LOW, 256 "lcd RESB", &ddata->resb_gpio); 257 if (r) 258 return r; 259 r = sharp_ls_get_gpio(&pdev->dev, pdata->ini_gpio, GPIOF_OUT_INIT_LOW, 260 "lcd INI", &ddata->ini_gpio); 261 if (r) 262 return r; 263 264 return 0; 265 } 266 267 static int sharp_ls_get_gpio_of(struct device *dev, int index, int val, 268 const char *desc, struct gpio_desc **gpiod) 269 { 270 struct gpio_desc *gd; 271 272 *gpiod = NULL; 273 274 gd = devm_gpiod_get_index(dev, desc, index, GPIOD_OUT_LOW); 275 if (IS_ERR(gd)) 276 return PTR_ERR(gd); 277 278 *gpiod = gd; 279 return 0; 280 } 281 282 static int sharp_ls_probe_of(struct platform_device *pdev) 283 { 284 struct panel_drv_data *ddata = platform_get_drvdata(pdev); 285 struct device_node *node = pdev->dev.of_node; 286 struct omap_dss_device *in; 287 int r; 288 289 ddata->vcc = devm_regulator_get(&pdev->dev, "envdd"); 290 if (IS_ERR(ddata->vcc)) { 291 dev_err(&pdev->dev, "failed to get regulator\n"); 292 return PTR_ERR(ddata->vcc); 293 } 294 295 /* lcd INI */ 296 r = sharp_ls_get_gpio_of(&pdev->dev, 0, 0, "enable", &ddata->ini_gpio); 297 if (r) 298 return r; 299 300 /* lcd RESB */ 301 r = sharp_ls_get_gpio_of(&pdev->dev, 0, 0, "reset", &ddata->resb_gpio); 302 if (r) 303 return r; 304 305 /* lcd MO */ 306 r = sharp_ls_get_gpio_of(&pdev->dev, 0, 0, "mode", &ddata->mo_gpio); 307 if (r) 308 return r; 309 310 /* lcd LR */ 311 r = sharp_ls_get_gpio_of(&pdev->dev, 1, 1, "mode", &ddata->lr_gpio); 312 if (r) 313 return r; 314 315 /* lcd UD */ 316 r = sharp_ls_get_gpio_of(&pdev->dev, 2, 1, "mode", &ddata->ud_gpio); 317 if (r) 318 return r; 319 320 in = omapdss_of_find_source_for_first_ep(node); 321 if (IS_ERR(in)) { 322 dev_err(&pdev->dev, "failed to find video source\n"); 323 return PTR_ERR(in); 324 } 325 326 ddata->in = in; 327 328 return 0; 329 } 330 331 static int sharp_ls_probe(struct platform_device *pdev) 332 { 333 struct panel_drv_data *ddata; 334 struct omap_dss_device *dssdev; 335 int r; 336 337 ddata = devm_kzalloc(&pdev->dev, sizeof(*ddata), GFP_KERNEL); 338 if (ddata == NULL) 339 return -ENOMEM; 340 341 platform_set_drvdata(pdev, ddata); 342 343 if (dev_get_platdata(&pdev->dev)) { 344 r = sharp_ls_probe_pdata(pdev); 345 if (r) 346 return r; 347 } else if (pdev->dev.of_node) { 348 r = sharp_ls_probe_of(pdev); 349 if (r) 350 return r; 351 } else { 352 return -ENODEV; 353 } 354 355 ddata->videomode = sharp_ls_timings; 356 357 dssdev = &ddata->dssdev; 358 dssdev->dev = &pdev->dev; 359 dssdev->driver = &sharp_ls_ops; 360 dssdev->type = OMAP_DISPLAY_TYPE_DPI; 361 dssdev->owner = THIS_MODULE; 362 dssdev->panel.timings = ddata->videomode; 363 dssdev->phy.dpi.data_lines = ddata->data_lines; 364 365 r = omapdss_register_display(dssdev); 366 if (r) { 367 dev_err(&pdev->dev, "Failed to register panel\n"); 368 goto err_reg; 369 } 370 371 return 0; 372 373 err_reg: 374 omap_dss_put_device(ddata->in); 375 return r; 376 } 377 378 static int __exit sharp_ls_remove(struct platform_device *pdev) 379 { 380 struct panel_drv_data *ddata = platform_get_drvdata(pdev); 381 struct omap_dss_device *dssdev = &ddata->dssdev; 382 struct omap_dss_device *in = ddata->in; 383 384 omapdss_unregister_display(dssdev); 385 386 sharp_ls_disable(dssdev); 387 sharp_ls_disconnect(dssdev); 388 389 omap_dss_put_device(in); 390 391 return 0; 392 } 393 394 static const struct of_device_id sharp_ls_of_match[] = { 395 { .compatible = "omapdss,sharp,ls037v7dw01", }, 396 {}, 397 }; 398 399 MODULE_DEVICE_TABLE(of, sharp_ls_of_match); 400 401 static struct platform_driver sharp_ls_driver = { 402 .probe = sharp_ls_probe, 403 .remove = __exit_p(sharp_ls_remove), 404 .driver = { 405 .name = "panel-sharp-ls037v7dw01", 406 .of_match_table = sharp_ls_of_match, 407 .suppress_bind_attrs = true, 408 }, 409 }; 410 411 module_platform_driver(sharp_ls_driver); 412 413 MODULE_AUTHOR("Tomi Valkeinen <tomi.valkeinen@ti.com>"); 414 MODULE_DESCRIPTION("Sharp LS037V7DW01 Panel Driver"); 415 MODULE_LICENSE("GPL"); 416