kernel/drivers/video/fbdev/omap2/displays-new/panel-sharp-ls037v7dw01.c

   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         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
 287 static 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
 336 static 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
 378 err_reg:
 379         omap_dss_put_device(ddata->in);
 380         return r;
 381 }
 382
 383 static 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
 399 static const struct of_device_id sharp_ls_of_match[] = {
 400         { .compatible = "omapdss,sharp,ls037v7dw01", },
 401         {},
 402 };
 403
 404 MODULE_DEVICE_TABLE(of, sharp_ls_of_match);
 405
 406 static 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
 416 module_platform_driver(sharp_ls_driver);
 417
 418 MODULE_AUTHOR("Tomi Valkeinen <tomi.valkeinen@ti.com>");
 419 MODULE_DESCRIPTION("Sharp LS037V7DW01 Panel Driver");
 420 MODULE_LICENSE("GPL");