drivers/gpu/drm/omapdrm/displays/panel-dpi.c

   1 /*
   2  * Generic MIPI DPI Panel Driver
   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/gpio.h>
  13 #include <linux/module.h>
  14 #include <linux/platform_device.h>
  15 #include <linux/slab.h>
  16 #include <linux/of.h>
  17 #include <linux/of_gpio.h>
  18
  19 #include <video/omapdss.h>
  20 #include <video/omap-panel-data.h>
  21 #include <video/of_display_timing.h>
  22
  23 struct panel_drv_data {
  24         struct omap_dss_device dssdev;
  25         struct omap_dss_device *in;
  26
  27         int data_lines;
  28
  29         struct omap_video_timings videomode;
  30
  31         /* used for non-DT boot, to be removed */
  32         int backlight_gpio;
  33
  34         struct gpio_desc *enable_gpio;
  35 };
  36
  37 #define to_panel_data(p) container_of(p, struct panel_drv_data, dssdev)
  38
  39 static int panel_dpi_connect(struct omap_dss_device *dssdev)
  40 {
  41         struct panel_drv_data *ddata = to_panel_data(dssdev);
  42         struct omap_dss_device *in = ddata->in;
  43         int r;
  44
  45         if (omapdss_device_is_connected(dssdev))
  46                 return 0;
  47
  48         r = in->ops.dpi->connect(in, dssdev);
  49         if (r)
  50                 return r;
  51
  52         return 0;
  53 }
  54
  55 static void panel_dpi_disconnect(struct omap_dss_device *dssdev)
  56 {
  57         struct panel_drv_data *ddata = to_panel_data(dssdev);
  58         struct omap_dss_device *in = ddata->in;
  59
  60         if (!omapdss_device_is_connected(dssdev))
  61                 return;
  62
  63         in->ops.dpi->disconnect(in, dssdev);
  64 }
  65
  66 static int panel_dpi_enable(struct omap_dss_device *dssdev)
  67 {
  68         struct panel_drv_data *ddata = to_panel_data(dssdev);
  69         struct omap_dss_device *in = ddata->in;
  70         int r;
  71
  72         if (!omapdss_device_is_connected(dssdev))
  73                 return -ENODEV;
  74
  75         if (omapdss_device_is_enabled(dssdev))
  76                 return 0;
  77
  78         if (ddata->data_lines)
  79                 in->ops.dpi->set_data_lines(in, ddata->data_lines);
  80         in->ops.dpi->set_timings(in, &ddata->videomode);
  81
  82         r = in->ops.dpi->enable(in);
  83         if (r)
  84                 return r;
  85
  86         gpiod_set_value_cansleep(ddata->enable_gpio, 1);
  87
  88         if (gpio_is_valid(ddata->backlight_gpio))
  89                 gpio_set_value_cansleep(ddata->backlight_gpio, 1);
  90
  91         dssdev->state = OMAP_DSS_DISPLAY_ACTIVE;
  92
  93         return 0;
  94 }
  95
  96 static void panel_dpi_disable(struct omap_dss_device *dssdev)
  97 {
  98         struct panel_drv_data *ddata = to_panel_data(dssdev);
  99         struct omap_dss_device *in = ddata->in;
 100
 101         if (!omapdss_device_is_enabled(dssdev))
 102                 return;
 103
 104         if (gpio_is_valid(ddata->backlight_gpio))
 105                 gpio_set_value_cansleep(ddata->backlight_gpio, 0);
 106
 107         gpiod_set_value_cansleep(ddata->enable_gpio, 0);
 108
 109         in->ops.dpi->disable(in);
 110
 111         dssdev->state = OMAP_DSS_DISPLAY_DISABLED;
 112 }
 113
 114 static void panel_dpi_set_timings(struct omap_dss_device *dssdev,
 115                 struct omap_video_timings *timings)
 116 {
 117         struct panel_drv_data *ddata = to_panel_data(dssdev);
 118         struct omap_dss_device *in = ddata->in;
 119
 120         ddata->videomode = *timings;
 121         dssdev->panel.timings = *timings;
 122
 123         in->ops.dpi->set_timings(in, timings);
 124 }
 125
 126 static void panel_dpi_get_timings(struct omap_dss_device *dssdev,
 127                 struct omap_video_timings *timings)
 128 {
 129         struct panel_drv_data *ddata = to_panel_data(dssdev);
 130
 131         *timings = ddata->videomode;
 132 }
 133
 134 static int panel_dpi_check_timings(struct omap_dss_device *dssdev,
 135                 struct omap_video_timings *timings)
 136 {
 137         struct panel_drv_data *ddata = to_panel_data(dssdev);
 138         struct omap_dss_device *in = ddata->in;
 139
 140         return in->ops.dpi->check_timings(in, timings);
 141 }
 142
 143 static struct omap_dss_driver panel_dpi_ops = {
 144         .connect        = panel_dpi_connect,
 145         .disconnect     = panel_dpi_disconnect,
 146
 147         .enable         = panel_dpi_enable,
 148         .disable        = panel_dpi_disable,
 149
 150         .set_timings    = panel_dpi_set_timings,
 151         .get_timings    = panel_dpi_get_timings,
 152         .check_timings  = panel_dpi_check_timings,
 153
 154         .get_resolution = omapdss_default_get_resolution,
 155 };
 156
 157 static int panel_dpi_probe_pdata(struct platform_device *pdev)
 158 {
 159         const struct panel_dpi_platform_data *pdata;
 160         struct panel_drv_data *ddata = platform_get_drvdata(pdev);
 161         struct omap_dss_device *dssdev, *in;
 162         struct videomode vm;
 163         int r;
 164
 165         pdata = dev_get_platdata(&pdev->dev);
 166
 167         in = omap_dss_find_output(pdata->source);
 168         if (in == NULL) {
 169                 dev_err(&pdev->dev, "failed to find video source '%s'\n",
 170                                 pdata->source);
 171                 return -EPROBE_DEFER;
 172         }
 173
 174         ddata->in = in;
 175
 176         ddata->data_lines = pdata->data_lines;
 177
 178         videomode_from_timing(pdata->display_timing, &vm);
 179         videomode_to_omap_video_timings(&vm, &ddata->videomode);
 180
 181         dssdev = &ddata->dssdev;
 182         dssdev->name = pdata->name;
 183
 184         r = devm_gpio_request_one(&pdev->dev, pdata->enable_gpio,
 185                                         GPIOF_OUT_INIT_LOW, "panel enable");
 186         if (r)
 187                 goto err_gpio;
 188
 189         ddata->enable_gpio = gpio_to_desc(pdata->enable_gpio);
 190
 191         ddata->backlight_gpio = pdata->backlight_gpio;
 192
 193         return 0;
 194
 195 err_gpio:
 196         omap_dss_put_device(ddata->in);
 197         return r;
 198 }
 199
 200 static int panel_dpi_probe_of(struct platform_device *pdev)
 201 {
 202         struct panel_drv_data *ddata = platform_get_drvdata(pdev);
 203         struct device_node *node = pdev->dev.of_node;
 204         struct omap_dss_device *in;
 205         int r;
 206         struct display_timing timing;
 207         struct videomode vm;
 208         struct gpio_desc *gpio;
 209
 210         gpio = devm_gpiod_get_optional(&pdev->dev, "enable", GPIOD_OUT_LOW);
 211         if (IS_ERR(gpio))
 212                 return PTR_ERR(gpio);
 213
 214         ddata->enable_gpio = gpio;
 215
 216         ddata->backlight_gpio = -ENOENT;
 217
 218         r = of_get_display_timing(node, "panel-timing", &timing);
 219         if (r) {
 220                 dev_err(&pdev->dev, "failed to get video timing\n");
 221                 return r;
 222         }
 223
 224         videomode_from_timing(&timing, &vm);
 225         videomode_to_omap_video_timings(&vm, &ddata->videomode);
 226
 227         in = omapdss_of_find_source_for_first_ep(node);
 228         if (IS_ERR(in)) {
 229                 dev_err(&pdev->dev, "failed to find video source\n");
 230                 return PTR_ERR(in);
 231         }
 232
 233         ddata->in = in;
 234
 235         return 0;
 236 }
 237
 238 static int panel_dpi_probe(struct platform_device *pdev)
 239 {
 240         struct panel_drv_data *ddata;
 241         struct omap_dss_device *dssdev;
 242         int r;
 243
 244         ddata = devm_kzalloc(&pdev->dev, sizeof(*ddata), GFP_KERNEL);
 245         if (ddata == NULL)
 246                 return -ENOMEM;
 247
 248         platform_set_drvdata(pdev, ddata);
 249
 250         if (dev_get_platdata(&pdev->dev)) {
 251                 r = panel_dpi_probe_pdata(pdev);
 252                 if (r)
 253                         return r;
 254         } else if (pdev->dev.of_node) {
 255                 r = panel_dpi_probe_of(pdev);
 256                 if (r)
 257                         return r;
 258         } else {
 259                 return -ENODEV;
 260         }
 261
 262         if (gpio_is_valid(ddata->backlight_gpio)) {
 263                 r = devm_gpio_request_one(&pdev->dev, ddata->backlight_gpio,
 264                                 GPIOF_OUT_INIT_LOW, "panel backlight");
 265                 if (r)
 266                         goto err_gpio;
 267         }
 268
 269         dssdev = &ddata->dssdev;
 270         dssdev->dev = &pdev->dev;
 271         dssdev->driver = &panel_dpi_ops;
 272         dssdev->type = OMAP_DISPLAY_TYPE_DPI;
 273         dssdev->owner = THIS_MODULE;
 274         dssdev->panel.timings = ddata->videomode;
 275         dssdev->phy.dpi.data_lines = ddata->data_lines;
 276
 277         r = omapdss_register_display(dssdev);
 278         if (r) {
 279                 dev_err(&pdev->dev, "Failed to register panel\n");
 280                 goto err_reg;
 281         }
 282
 283         return 0;
 284
 285 err_reg:
 286 err_gpio:
 287         omap_dss_put_device(ddata->in);
 288         return r;
 289 }
 290
 291 static int __exit panel_dpi_remove(struct platform_device *pdev)
 292 {
 293         struct panel_drv_data *ddata = platform_get_drvdata(pdev);
 294         struct omap_dss_device *dssdev = &ddata->dssdev;
 295         struct omap_dss_device *in = ddata->in;
 296
 297         omapdss_unregister_display(dssdev);
 298
 299         panel_dpi_disable(dssdev);
 300         panel_dpi_disconnect(dssdev);
 301
 302         omap_dss_put_device(in);
 303
 304         return 0;
 305 }
 306
 307 static const struct of_device_id panel_dpi_of_match[] = {
 308         { .compatible = "omapdss,panel-dpi", },
 309         {},
 310 };
 311
 312 MODULE_DEVICE_TABLE(of, panel_dpi_of_match);
 313
 314 static struct platform_driver panel_dpi_driver = {
 315         .probe = panel_dpi_probe,
 316         .remove = __exit_p(panel_dpi_remove),
 317         .driver = {
 318                 .name = "panel-dpi",
 319                 .of_match_table = panel_dpi_of_match,
 320                 .suppress_bind_attrs = true,
 321         },
 322 };
 323
 324 module_platform_driver(panel_dpi_driver);
 325
 326 MODULE_AUTHOR("Tomi Valkeinen <tomi.valkeinen@ti.com>");
 327 MODULE_DESCRIPTION("Generic MIPI DPI Panel Driver");
 328 MODULE_LICENSE("GPL");