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 23struct 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 39static 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 62static 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 78static 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 89static 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 131static 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 157static 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 169static 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 177static 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 186static 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 200static 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 220static 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 267static 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 int r; 272 273 *gpiod = NULL; 274 275 gd = devm_gpiod_get_index(dev, desc, index); 276 if (IS_ERR(gd)) 277 return PTR_ERR(gd) == -ENOENT ? 0 : PTR_ERR(gd); 278 279 r = gpiod_direction_output(gd, val); 280 if (r) 281 return r; 282 283 *gpiod = gd; 284 return 0; 285} 286 287static int sharp_ls_probe_of(struct platform_device *pdev) 288{ 289 struct panel_drv_data *ddata = platform_get_drvdata(pdev); 290 struct device_node *node = pdev->dev.of_node; 291 struct omap_dss_device *in; 292 int r; 293 294 ddata->vcc = devm_regulator_get(&pdev->dev, "envdd"); 295 if (IS_ERR(ddata->vcc)) { 296 dev_err(&pdev->dev, "failed to get regulator\n"); 297 return PTR_ERR(ddata->vcc); 298 } 299 300 /* lcd INI */ 301 r = sharp_ls_get_gpio_of(&pdev->dev, 0, 0, "enable", &ddata->ini_gpio); 302 if (r) 303 return r; 304 305 /* lcd RESB */ 306 r = sharp_ls_get_gpio_of(&pdev->dev, 0, 0, "reset", &ddata->resb_gpio); 307 if (r) 308 return r; 309 310 /* lcd MO */ 311 r = sharp_ls_get_gpio_of(&pdev->dev, 0, 0, "mode", &ddata->mo_gpio); 312 if (r) 313 return r; 314 315 /* lcd LR */ 316 r = sharp_ls_get_gpio_of(&pdev->dev, 1, 1, "mode", &ddata->lr_gpio); 317 if (r) 318 return r; 319 320 /* lcd UD */ 321 r = sharp_ls_get_gpio_of(&pdev->dev, 2, 1, "mode", &ddata->ud_gpio); 322 if (r) 323 return r; 324 325 in = omapdss_of_find_source_for_first_ep(node); 326 if (IS_ERR(in)) { 327 dev_err(&pdev->dev, "failed to find video source\n"); 328 return PTR_ERR(in); 329 } 330 331 ddata->in = in; 332 333 return 0; 334} 335 336static int sharp_ls_probe(struct platform_device *pdev) 337{ 338 struct panel_drv_data *ddata; 339 struct omap_dss_device *dssdev; 340 int r; 341 342 ddata = devm_kzalloc(&pdev->dev, sizeof(*ddata), GFP_KERNEL); 343 if (ddata == NULL) 344 return -ENOMEM; 345 346 platform_set_drvdata(pdev, ddata); 347 348 if (dev_get_platdata(&pdev->dev)) { 349 r = sharp_ls_probe_pdata(pdev); 350 if (r) 351 return r; 352 } else if (pdev->dev.of_node) { 353 r = sharp_ls_probe_of(pdev); 354 if (r) 355 return r; 356 } else { 357 return -ENODEV; 358 } 359 360 ddata->videomode = sharp_ls_timings; 361 362 dssdev = &ddata->dssdev; 363 dssdev->dev = &pdev->dev; 364 dssdev->driver = &sharp_ls_ops; 365 dssdev->type = OMAP_DISPLAY_TYPE_DPI; 366 dssdev->owner = THIS_MODULE; 367 dssdev->panel.timings = ddata->videomode; 368 dssdev->phy.dpi.data_lines = ddata->data_lines; 369 370 r = omapdss_register_display(dssdev); 371 if (r) { 372 dev_err(&pdev->dev, "Failed to register panel\n"); 373 goto err_reg; 374 } 375 376 return 0; 377 378err_reg: 379 omap_dss_put_device(ddata->in); 380 return r; 381} 382 383static int __exit sharp_ls_remove(struct platform_device *pdev) 384{ 385 struct panel_drv_data *ddata = platform_get_drvdata(pdev); 386 struct omap_dss_device *dssdev = &ddata->dssdev; 387 struct omap_dss_device *in = ddata->in; 388 389 omapdss_unregister_display(dssdev); 390 391 sharp_ls_disable(dssdev); 392 sharp_ls_disconnect(dssdev); 393 394 omap_dss_put_device(in); 395 396 return 0; 397} 398 399static const struct of_device_id sharp_ls_of_match[] = { 400 { .compatible = "omapdss,sharp,ls037v7dw01", }, 401 {}, 402}; 403 404MODULE_DEVICE_TABLE(of, sharp_ls_of_match); 405 406static struct platform_driver sharp_ls_driver = { 407 .probe = sharp_ls_probe, 408 .remove = __exit_p(sharp_ls_remove), 409 .driver = { 410 .name = "panel-sharp-ls037v7dw01", 411 .of_match_table = sharp_ls_of_match, 412 .suppress_bind_attrs = true, 413 }, 414}; 415 416module_platform_driver(sharp_ls_driver); 417 418MODULE_AUTHOR("Tomi Valkeinen <tomi.valkeinen@ti.com>"); 419MODULE_DESCRIPTION("Sharp LS037V7DW01 Panel Driver"); 420MODULE_LICENSE("GPL"); 421