drivers/gpu/drm/omapdrm/displays/panel-sharp-ls037v7dw01.c

   1 /*
   2  * LCD panel driver for Sharp LS037V7DW01
   3  *
   4  * Copyright (C) 2013 Texas Instruments
   5  * Author: Tomi Valkeinen <[email protected]>
   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
  22 struct panel_drv_data {
  23         struct omap_dss_device dssdev;
  24         struct omap_dss_device *in;
  25         struct regulator *vcc;
  26
  27         int data_lines;
  28
  29         struct omap_video_timings videomode;
  30
  31         struct gpio_desc *resb_gpio;    /* low = reset active min 20 us */
  32         struct gpio_desc *ini_gpio;     /* high = power on */
  33         struct gpio_desc *mo_gpio;      /* low = 480x640, high = 240x320 */
  34         struct gpio_desc *lr_gpio;      /* high = conventional horizontal scanning */
  35         struct gpio_desc *ud_gpio;      /* high = conventional vertical scanning */
  36 };
  37
  38 static const struct omap_video_timings sharp_ls_timings = {
  39         .x_res = 480,
  40         .y_res = 640,
  41
  42         .pixelclock     = 19200000,
  43
  44         .hsw            = 2,
  45         .hfp            = 1,
  46         .hbp            = 28,
  47
  48         .vsw            = 1,
  49         .vfp            = 1,
  50         .vbp            = 1,
  51
  52         .vsync_level    = OMAPDSS_SIG_ACTIVE_LOW,
  53         .hsync_level    = OMAPDSS_SIG_ACTIVE_LOW,
  54         .data_pclk_edge = OMAPDSS_DRIVE_SIG_RISING_EDGE,
  55         .de_level       = OMAPDSS_SIG_ACTIVE_HIGH,
  56         .sync_pclk_edge = OMAPDSS_DRIVE_SIG_FALLING_EDGE,
  57 };
  58
  59 #define to_panel_data(p) container_of(p, struct panel_drv_data, dssdev)
  60
  61 static int sharp_ls_connect(struct omap_dss_device *dssdev)
  62 {
  63         struct panel_drv_data *ddata = to_panel_data(dssdev);
  64         struct omap_dss_device *in = ddata->in;
  65         int r;
  66
  67         if (omapdss_device_is_connected(dssdev))
  68                 return 0;
  69
  70         r = in->ops.dpi->connect(in, dssdev);
  71         if (r)
  72                 return r;
  73
  74         return 0;
  75 }
  76
  77 static void sharp_ls_disconnect(struct omap_dss_device *dssdev)
  78 {
  79         struct panel_drv_data *ddata = to_panel_data(dssdev);
  80         struct omap_dss_device *in = ddata->in;
  81
  82         if (!omapdss_device_is_connected(dssdev))
  83                 return;
  84
  85         in->ops.dpi->disconnect(in, dssdev);
  86 }
  87
  88 static int sharp_ls_enable(struct omap_dss_device *dssdev)
  89 {
  90         struct panel_drv_data *ddata = to_panel_data(dssdev);
  91         struct omap_dss_device *in = ddata->in;
  92         int r;
  93
  94         if (!omapdss_device_is_connected(dssdev))
  95                 return -ENODEV;
  96
  97         if (omapdss_device_is_enabled(dssdev))
  98                 return 0;
  99
 100         if (ddata->data_lines)
 101                 in->ops.dpi->set_data_lines(in, ddata->data_lines);
 102         in->ops.dpi->set_timings(in, &ddata->videomode);
 103
 104         if (ddata->vcc) {
 105                 r = regulator_enable(ddata->vcc);
 106                 if (r != 0)
 107                         return r;
 108         }
 109
 110         r = in->ops.dpi->enable(in);
 111         if (r) {
 112                 regulator_disable(ddata->vcc);
 113                 return r;
 114         }
 115
 116         /* wait couple of vsyncs until enabling the LCD */
 117         msleep(50);
 118
 119         if (ddata->resb_gpio)
 120                 gpiod_set_value_cansleep(ddata->resb_gpio, 1);
 121
 122         if (ddata->ini_gpio)
 123                 gpiod_set_value_cansleep(ddata->ini_gpio, 1);
 124
 125         dssdev->state = OMAP_DSS_DISPLAY_ACTIVE;
 126
 127         return 0;
 128 }
 129
 130 static void sharp_ls_disable(struct omap_dss_device *dssdev)
 131 {
 132         struct panel_drv_data *ddata = to_panel_data(dssdev);
 133         struct omap_dss_device *in = ddata->in;
 134
 135         if (!omapdss_device_is_enabled(dssdev))
 136                 return;
 137
 138         if (ddata->ini_gpio)
 139                 gpiod_set_value_cansleep(ddata->ini_gpio, 0);
 140
 141         if (ddata->resb_gpio)
 142                 gpiod_set_value_cansleep(ddata->resb_gpio, 0);
 143
 144         /* wait at least 5 vsyncs after disabling the LCD */
 145
 146         msleep(100);
 147
 148         in->ops.dpi->disable(in);
 149
 150         if (ddata->vcc)
 151                 regulator_disable(ddata->vcc);
 152
 153         dssdev->state = OMAP_DSS_DISPLAY_DISABLED;
 154 }
 155
 156 static void sharp_ls_set_timings(struct omap_dss_device *dssdev,
 157                 struct omap_video_timings *timings)
 158 {
 159         struct panel_drv_data *ddata = to_panel_data(dssdev);
 160         struct omap_dss_device *in = ddata->in;
 161
 162         ddata->videomode = *timings;
 163         dssdev->panel.timings = *timings;
 164
 165         in->ops.dpi->set_timings(in, timings);
 166 }
 167
 168 static void sharp_ls_get_timings(struct omap_dss_device *dssdev,
 169                 struct omap_video_timings *timings)
 170 {
 171         struct panel_drv_data *ddata = to_panel_data(dssdev);
 172
 173         *timings = ddata->videomode;
 174 }
 175
 176 static int sharp_ls_check_timings(struct omap_dss_device *dssdev,
 177                 struct omap_video_timings *timings)
 178 {
 179         struct panel_drv_data *ddata = to_panel_data(dssdev);
 180         struct omap_dss_device *in = ddata->in;
 181
 182         return in->ops.dpi->check_timings(in, timings);
 183 }
 184
 185 static struct omap_dss_driver sharp_ls_ops = {
 186         .connect        = sharp_ls_connect,
 187         .disconnect     = sharp_ls_disconnect,
 188
 189         .enable         = sharp_ls_enable,
 190         .disable        = sharp_ls_disable,
 191
 192         .set_timings    = sharp_ls_set_timings,
 193         .get_timings    = sharp_ls_get_timings,
 194         .check_timings  = sharp_ls_check_timings,
 195
 196         .get_resolution = omapdss_default_get_resolution,
 197 };
 198
 199 static  int sharp_ls_get_gpio_of(struct device *dev, int index, int val,
 200         const char *desc, struct gpio_desc **gpiod)
 201 {
 202         struct gpio_desc *gd;
 203
 204         *gpiod = NULL;
 205
 206         gd = devm_gpiod_get_index(dev, desc, index, GPIOD_OUT_LOW);
 207         if (IS_ERR(gd))
 208                 return PTR_ERR(gd);
 209
 210         *gpiod = gd;
 211         return 0;
 212 }
 213
 214 static int sharp_ls_probe_of(struct platform_device *pdev)
 215 {
 216         struct panel_drv_data *ddata = platform_get_drvdata(pdev);
 217         struct device_node *node = pdev->dev.of_node;
 218         struct omap_dss_device *in;
 219         int r;
 220
 221         ddata->vcc = devm_regulator_get(&pdev->dev, "envdd");
 222         if (IS_ERR(ddata->vcc)) {
 223                 dev_err(&pdev->dev, "failed to get regulator\n");
 224                 return PTR_ERR(ddata->vcc);
 225         }
 226
 227         /* lcd INI */
 228         r = sharp_ls_get_gpio_of(&pdev->dev, 0, 0, "enable", &ddata->ini_gpio);
 229         if (r)
 230                 return r;
 231
 232         /* lcd RESB */
 233         r = sharp_ls_get_gpio_of(&pdev->dev, 0, 0, "reset", &ddata->resb_gpio);
 234         if (r)
 235                 return r;
 236
 237         /* lcd MO */
 238         r = sharp_ls_get_gpio_of(&pdev->dev, 0, 0, "mode", &ddata->mo_gpio);
 239         if (r)
 240                 return r;
 241
 242         /* lcd LR */
 243         r = sharp_ls_get_gpio_of(&pdev->dev, 1, 1, "mode", &ddata->lr_gpio);
 244         if (r)
 245                 return r;
 246
 247         /* lcd UD */
 248         r = sharp_ls_get_gpio_of(&pdev->dev, 2, 1, "mode", &ddata->ud_gpio);
 249         if (r)
 250                 return r;
 251
 252         in = omapdss_of_find_source_for_first_ep(node);
 253         if (IS_ERR(in)) {
 254                 dev_err(&pdev->dev, "failed to find video source\n");
 255                 return PTR_ERR(in);
 256         }
 257
 258         ddata->in = in;
 259
 260         return 0;
 261 }
 262
 263 static int sharp_ls_probe(struct platform_device *pdev)
 264 {
 265         struct panel_drv_data *ddata;
 266         struct omap_dss_device *dssdev;
 267         int r;
 268
 269         ddata = devm_kzalloc(&pdev->dev, sizeof(*ddata), GFP_KERNEL);
 270         if (ddata == NULL)
 271                 return -ENOMEM;
 272
 273         platform_set_drvdata(pdev, ddata);
 274
 275         if (!pdev->dev.of_node)
 276                 return -ENODEV;
 277
 278         r = sharp_ls_probe_of(pdev);
 279         if (r)
 280                 return r;
 281
 282         ddata->videomode = sharp_ls_timings;
 283
 284         dssdev = &ddata->dssdev;
 285         dssdev->dev = &pdev->dev;
 286         dssdev->driver = &sharp_ls_ops;
 287         dssdev->type = OMAP_DISPLAY_TYPE_DPI;
 288         dssdev->owner = THIS_MODULE;
 289         dssdev->panel.timings = ddata->videomode;
 290         dssdev->phy.dpi.data_lines = ddata->data_lines;
 291
 292         r = omapdss_register_display(dssdev);
 293         if (r) {
 294                 dev_err(&pdev->dev, "Failed to register panel\n");
 295                 goto err_reg;
 296         }
 297
 298         return 0;
 299
 300 err_reg:
 301         omap_dss_put_device(ddata->in);
 302         return r;
 303 }
 304
 305 static int __exit sharp_ls_remove(struct platform_device *pdev)
 306 {
 307         struct panel_drv_data *ddata = platform_get_drvdata(pdev);
 308         struct omap_dss_device *dssdev = &ddata->dssdev;
 309         struct omap_dss_device *in = ddata->in;
 310
 311         omapdss_unregister_display(dssdev);
 312
 313         sharp_ls_disable(dssdev);
 314         sharp_ls_disconnect(dssdev);
 315
 316         omap_dss_put_device(in);
 317
 318         return 0;
 319 }
 320
 321 static const struct of_device_id sharp_ls_of_match[] = {
 322         { .compatible = "omapdss,sharp,ls037v7dw01", },
 323         {},
 324 };
 325
 326 MODULE_DEVICE_TABLE(of, sharp_ls_of_match);
 327
 328 static struct platform_driver sharp_ls_driver = {
 329         .probe = sharp_ls_probe,
 330         .remove = __exit_p(sharp_ls_remove),
 331         .driver = {
 332                 .name = "panel-sharp-ls037v7dw01",
 333                 .of_match_table = sharp_ls_of_match,
 334                 .suppress_bind_attrs = true,
 335         },
 336 };
 337
 338 module_platform_driver(sharp_ls_driver);
 339
 340 MODULE_AUTHOR("Tomi Valkeinen <[email protected]>");
 341 MODULE_DESCRIPTION("Sharp LS037V7DW01 Panel Driver");
 342 MODULE_LICENSE("GPL");