kernel/drivers/video/fbdev/omap2/displays-new/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         if (ddata->enable_gpio)
  87                 gpiod_set_value_cansleep(ddata->enable_gpio, 1);
  88
  89         if (gpio_is_valid(ddata->backlight_gpio))
  90                 gpio_set_value_cansleep(ddata->backlight_gpio, 1);
  91
  92         dssdev->state = OMAP_DSS_DISPLAY_ACTIVE;
  93
  94         return 0;
  95 }
  96
  97 static void panel_dpi_disable(struct omap_dss_device *dssdev)
  98 {
  99         struct panel_drv_data *ddata = to_panel_data(dssdev);
 100         struct omap_dss_device *in = ddata->in;
 101
 102         if (!omapdss_device_is_enabled(dssdev))
 103                 return;
 104
 105         if (ddata->enable_gpio)
 106                 gpiod_set_value_cansleep(ddata->enable_gpio, 0);
 107
 108         if (gpio_is_valid(ddata->backlight_gpio))
 109                 gpio_set_value_cansleep(ddata->backlight_gpio, 0);
 110
 111         in->ops.dpi->disable(in);
 112
 113         dssdev->state = OMAP_DSS_DISPLAY_DISABLED;
 114 }
 115
 116 static void panel_dpi_set_timings(struct omap_dss_device *dssdev,
 117                 struct omap_video_timings *timings)
 118 {
 119         struct panel_drv_data *ddata = to_panel_data(dssdev);
 120         struct omap_dss_device *in = ddata->in;
 121
 122         ddata->videomode = *timings;
 123         dssdev->panel.timings = *timings;
 124
 125         in->ops.dpi->set_timings(in, timings);
 126 }
 127
 128 static void panel_dpi_get_timings(struct omap_dss_device *dssdev,
 129                 struct omap_video_timings *timings)
 130 {
 131         struct panel_drv_data *ddata = to_panel_data(dssdev);
 132
 133         *timings = ddata->videomode;
 134 }
 135
 136 static int panel_dpi_check_timings(struct omap_dss_device *dssdev,
 137                 struct omap_video_timings *timings)
 138 {
 139         struct panel_drv_data *ddata = to_panel_data(dssdev);
 140         struct omap_dss_device *in = ddata->in;
 141
 142         return in->ops.dpi->check_timings(in, timings);
 143 }
 144
 145 static struct omap_dss_driver panel_dpi_ops = {
 146         .connect        = panel_dpi_connect,
 147         .disconnect     = panel_dpi_disconnect,
 148
 149         .enable         = panel_dpi_enable,
 150         .disable        = panel_dpi_disable,
 151
 152         .set_timings    = panel_dpi_set_timings,
 153         .get_timings    = panel_dpi_get_timings,
 154         .check_timings  = panel_dpi_check_timings,
 155
 156         .get_resolution = omapdss_default_get_resolution,
 157 };
 158
 159 static int panel_dpi_probe_pdata(struct platform_device *pdev)
 160 {
 161         const struct panel_dpi_platform_data *pdata;
 162         struct panel_drv_data *ddata = platform_get_drvdata(pdev);
 163         struct omap_dss_device *dssdev, *in;
 164         struct videomode vm;
 165         int r;
 166
 167         pdata = dev_get_platdata(&pdev->dev);
 168
 169         in = omap_dss_find_output(pdata->source);
 170         if (in == NULL) {
 171                 dev_err(&pdev->dev, "failed to find video source '%s'\n",
 172                                 pdata->source);
 173                 return -EPROBE_DEFER;
 174         }
 175
 176         ddata->in = in;
 177
 178         ddata->data_lines = pdata->data_lines;
 179
 180         videomode_from_timing(pdata->display_timing, &vm);
 181         videomode_to_omap_video_timings(&vm, &ddata->videomode);
 182
 183         dssdev = &ddata->dssdev;
 184         dssdev->name = pdata->name;
 185
 186         r = devm_gpio_request_one(&pdev->dev, pdata->enable_gpio,
 187                                         GPIOF_OUT_INIT_LOW, "panel enable");
 188         if (r)
 189                 goto err_gpio;
 190
 191         ddata->enable_gpio = gpio_to_desc(pdata->enable_gpio);
 192
 193         ddata->backlight_gpio = pdata->backlight_gpio;
 194
 195         return 0;
 196
 197 err_gpio:
 198         omap_dss_put_device(ddata->in);
 199         return r;
 200 }
 201
 202 static int panel_dpi_probe_of(struct platform_device *pdev)
 203 {
 204         struct panel_drv_data *ddata = platform_get_drvdata(pdev);
 205         struct device_node *node = pdev->dev.of_node;
 206         struct omap_dss_device *in;
 207         int r;
 208         struct display_timing timing;
 209         struct videomode vm;
 210         struct gpio_desc *gpio;
 211
 212         gpio = devm_gpiod_get_optional(&pdev->dev, "enable", GPIOD_OUT_LOW);
 213         if (IS_ERR(gpio))
 214                 return PTR_ERR(gpio);
 215
 216         ddata->enable_gpio = gpio;
 217
 218         ddata->backlight_gpio = -ENOENT;
 219
 220         r = of_get_display_timing(node, "panel-timing", &timing);
 221         if (r) {
 222                 dev_err(&pdev->dev, "failed to get video timing\n");
 223                 return r;
 224         }
 225
 226         videomode_from_timing(&timing, &vm);
 227         videomode_to_omap_video_timings(&vm, &ddata->videomode);
 228
 229         in = omapdss_of_find_source_for_first_ep(node);
 230         if (IS_ERR(in)) {
 231                 dev_err(&pdev->dev, "failed to find video source\n");
 232                 return PTR_ERR(in);
 233         }
 234
 235         ddata->in = in;
 236
 237         return 0;
 238 }
 239
 240 static int panel_dpi_probe(struct platform_device *pdev)
 241 {
 242         struct panel_drv_data *ddata;
 243         struct omap_dss_device *dssdev;
 244         int r;
 245
 246         ddata = devm_kzalloc(&pdev->dev, sizeof(*ddata), GFP_KERNEL);
 247         if (ddata == NULL)
 248                 return -ENOMEM;
 249
 250         platform_set_drvdata(pdev, ddata);
 251
 252         if (dev_get_platdata(&pdev->dev)) {
 253                 r = panel_dpi_probe_pdata(pdev);
 254                 if (r)
 255                         return r;
 256         } else if (pdev->dev.of_node) {
 257                 r = panel_dpi_probe_of(pdev);
 258                 if (r)
 259                         return r;
 260         } else {
 261                 return -ENODEV;
 262         }
 263
 264         if (gpio_is_valid(ddata->backlight_gpio)) {
 265                 r = devm_gpio_request_one(&pdev->dev, ddata->backlight_gpio,
 266                                 GPIOF_OUT_INIT_LOW, "panel backlight");
 267                 if (r)
 268                         goto err_gpio;
 269         }
 270
 271         dssdev = &ddata->dssdev;
 272         dssdev->dev = &pdev->dev;
 273         dssdev->driver = &panel_dpi_ops;
 274         dssdev->type = OMAP_DISPLAY_TYPE_DPI;
 275         dssdev->owner = THIS_MODULE;
 276         dssdev->panel.timings = ddata->videomode;
 277         dssdev->phy.dpi.data_lines = ddata->data_lines;
 278
 279         r = omapdss_register_display(dssdev);
 280         if (r) {
 281                 dev_err(&pdev->dev, "Failed to register panel\n");
 282                 goto err_reg;
 283         }
 284
 285         return 0;
 286
 287 err_reg:
 288 err_gpio:
 289         omap_dss_put_device(ddata->in);
 290         return r;
 291 }
 292
 293 static int __exit panel_dpi_remove(struct platform_device *pdev)
 294 {
 295         struct panel_drv_data *ddata = platform_get_drvdata(pdev);
 296         struct omap_dss_device *dssdev = &ddata->dssdev;
 297         struct omap_dss_device *in = ddata->in;
 298
 299         omapdss_unregister_display(dssdev);
 300
 301         panel_dpi_disable(dssdev);
 302         panel_dpi_disconnect(dssdev);
 303
 304         omap_dss_put_device(in);
 305
 306         return 0;
 307 }
 308
 309 static const struct of_device_id panel_dpi_of_match[] = {
 310         { .compatible = "omapdss,panel-dpi", },
 311         {},
 312 };
 313
 314 MODULE_DEVICE_TABLE(of, panel_dpi_of_match);
 315
 316 static struct platform_driver panel_dpi_driver = {
 317         .probe = panel_dpi_probe,
 318         .remove = __exit_p(panel_dpi_remove),
 319         .driver = {
 320                 .name = "panel-dpi",
 321                 .of_match_table = panel_dpi_of_match,
 322                 .suppress_bind_attrs = true,
 323         },
 324 };
 325
 326 module_platform_driver(panel_dpi_driver);
 327
 328 MODULE_AUTHOR("Tomi Valkeinen <tomi.valkeinen@ti.com>");
 329 MODULE_DESCRIPTION("Generic MIPI DPI Panel Driver");
 330 MODULE_LICENSE("GPL");