drivers/video/fbdev/omap2/omapfb/displays/panel-dpi.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * Generic MIPI DPI Panel Driver
   4  *
   5  * Copyright (C) 2013 Texas Instruments
   6  * Author: Tomi Valkeinen <tomi.valkeinen@ti.com>
   7  */
   8
   9 #include <linux/gpio/consumer.h>
  10 #include <linux/module.h>
  11 #include <linux/platform_device.h>
  12 #include <linux/slab.h>
  13 #include <linux/of.h>
  14
  15 #include <video/omapfb_dss.h>
  16 #include <video/of_display_timing.h>
  17
  18 struct panel_drv_data {
  19         struct omap_dss_device dssdev;
  20         struct omap_dss_device *in;
  21
  22         int data_lines;
  23
  24         struct omap_video_timings videomode;
  25
  26         struct gpio_desc *enable_gpio;
  27 };
  28
  29 #define to_panel_data(p) container_of(p, struct panel_drv_data, dssdev)
  30
  31 static int panel_dpi_connect(struct omap_dss_device *dssdev)
  32 {
  33         struct panel_drv_data *ddata = to_panel_data(dssdev);
  34         struct omap_dss_device *in = ddata->in;
  35
  36         if (omapdss_device_is_connected(dssdev))
  37                 return 0;
  38
  39         return in->ops.dpi->connect(in, dssdev);
  40 }
  41
  42 static void panel_dpi_disconnect(struct omap_dss_device *dssdev)
  43 {
  44         struct panel_drv_data *ddata = to_panel_data(dssdev);
  45         struct omap_dss_device *in = ddata->in;
  46
  47         if (!omapdss_device_is_connected(dssdev))
  48                 return;
  49
  50         in->ops.dpi->disconnect(in, dssdev);
  51 }
  52
  53 static int panel_dpi_enable(struct omap_dss_device *dssdev)
  54 {
  55         struct panel_drv_data *ddata = to_panel_data(dssdev);
  56         struct omap_dss_device *in = ddata->in;
  57         int r;
  58
  59         if (!omapdss_device_is_connected(dssdev))
  60                 return -ENODEV;
  61
  62         if (omapdss_device_is_enabled(dssdev))
  63                 return 0;
  64
  65         if (ddata->data_lines)
  66                 in->ops.dpi->set_data_lines(in, ddata->data_lines);
  67         in->ops.dpi->set_timings(in, &ddata->videomode);
  68
  69         r = in->ops.dpi->enable(in);
  70         if (r)
  71                 return r;
  72
  73         gpiod_set_value_cansleep(ddata->enable_gpio, 1);
  74
  75         dssdev->state = OMAP_DSS_DISPLAY_ACTIVE;
  76
  77         return 0;
  78 }
  79
  80 static void panel_dpi_disable(struct omap_dss_device *dssdev)
  81 {
  82         struct panel_drv_data *ddata = to_panel_data(dssdev);
  83         struct omap_dss_device *in = ddata->in;
  84
  85         if (!omapdss_device_is_enabled(dssdev))
  86                 return;
  87
  88         gpiod_set_value_cansleep(ddata->enable_gpio, 0);
  89
  90         in->ops.dpi->disable(in);
  91
  92         dssdev->state = OMAP_DSS_DISPLAY_DISABLED;
  93 }
  94
  95 static void panel_dpi_set_timings(struct omap_dss_device *dssdev,
  96                 struct omap_video_timings *timings)
  97 {
  98         struct panel_drv_data *ddata = to_panel_data(dssdev);
  99         struct omap_dss_device *in = ddata->in;
 100
 101         ddata->videomode = *timings;
 102         dssdev->panel.timings = *timings;
 103
 104         in->ops.dpi->set_timings(in, timings);
 105 }
 106
 107 static void panel_dpi_get_timings(struct omap_dss_device *dssdev,
 108                 struct omap_video_timings *timings)
 109 {
 110         struct panel_drv_data *ddata = to_panel_data(dssdev);
 111
 112         *timings = ddata->videomode;
 113 }
 114
 115 static int panel_dpi_check_timings(struct omap_dss_device *dssdev,
 116                 struct omap_video_timings *timings)
 117 {
 118         struct panel_drv_data *ddata = to_panel_data(dssdev);
 119         struct omap_dss_device *in = ddata->in;
 120
 121         return in->ops.dpi->check_timings(in, timings);
 122 }
 123
 124 static struct omap_dss_driver panel_dpi_ops = {
 125         .connect        = panel_dpi_connect,
 126         .disconnect     = panel_dpi_disconnect,
 127
 128         .enable         = panel_dpi_enable,
 129         .disable        = panel_dpi_disable,
 130
 131         .set_timings    = panel_dpi_set_timings,
 132         .get_timings    = panel_dpi_get_timings,
 133         .check_timings  = panel_dpi_check_timings,
 134
 135         .get_resolution = omapdss_default_get_resolution,
 136 };
 137
 138 static int panel_dpi_probe_of(struct platform_device *pdev)
 139 {
 140         struct panel_drv_data *ddata = platform_get_drvdata(pdev);
 141         struct device_node *node = pdev->dev.of_node;
 142         struct omap_dss_device *in;
 143         int r;
 144         struct display_timing timing;
 145         struct videomode vm;
 146         struct gpio_desc *gpio;
 147
 148         gpio = devm_gpiod_get_optional(&pdev->dev, "enable", GPIOD_OUT_LOW);
 149         if (IS_ERR(gpio))
 150                 return PTR_ERR(gpio);
 151
 152         ddata->enable_gpio = gpio;
 153
 154         r = of_get_display_timing(node, "panel-timing", &timing);
 155         if (r) {
 156                 dev_err(&pdev->dev, "failed to get video timing\n");
 157                 return r;
 158         }
 159
 160         videomode_from_timing(&timing, &vm);
 161         videomode_to_omap_video_timings(&vm, &ddata->videomode);
 162
 163         in = omapdss_of_find_source_for_first_ep(node);
 164         if (IS_ERR(in)) {
 165                 dev_err(&pdev->dev, "failed to find video source\n");
 166                 return PTR_ERR(in);
 167         }
 168
 169         ddata->in = in;
 170
 171         return 0;
 172 }
 173
 174 static int panel_dpi_probe(struct platform_device *pdev)
 175 {
 176         struct panel_drv_data *ddata;
 177         struct omap_dss_device *dssdev;
 178         int r;
 179
 180         if (!pdev->dev.of_node)
 181                 return -ENODEV;
 182
 183         ddata = devm_kzalloc(&pdev->dev, sizeof(*ddata), GFP_KERNEL);
 184         if (ddata == NULL)
 185                 return -ENOMEM;
 186
 187         platform_set_drvdata(pdev, ddata);
 188
 189         r = panel_dpi_probe_of(pdev);
 190         if (r)
 191                 return r;
 192
 193         dssdev = &ddata->dssdev;
 194         dssdev->dev = &pdev->dev;
 195         dssdev->driver = &panel_dpi_ops;
 196         dssdev->type = OMAP_DISPLAY_TYPE_DPI;
 197         dssdev->owner = THIS_MODULE;
 198         dssdev->panel.timings = ddata->videomode;
 199         dssdev->phy.dpi.data_lines = ddata->data_lines;
 200
 201         r = omapdss_register_display(dssdev);
 202         if (r) {
 203                 dev_err(&pdev->dev, "Failed to register panel\n");
 204                 goto err_reg;
 205         }
 206
 207         return 0;
 208
 209 err_reg:
 210         omap_dss_put_device(ddata->in);
 211         return r;
 212 }
 213
 214 static void panel_dpi_remove(struct platform_device *pdev)
 215 {
 216         struct panel_drv_data *ddata = platform_get_drvdata(pdev);
 217         struct omap_dss_device *dssdev = &ddata->dssdev;
 218         struct omap_dss_device *in = ddata->in;
 219
 220         omapdss_unregister_display(dssdev);
 221
 222         panel_dpi_disable(dssdev);
 223         panel_dpi_disconnect(dssdev);
 224
 225         omap_dss_put_device(in);
 226 }
 227
 228 static const struct of_device_id panel_dpi_of_match[] = {
 229         { .compatible = "omapdss,panel-dpi", },
 230         {},
 231 };
 232
 233 MODULE_DEVICE_TABLE(of, panel_dpi_of_match);
 234
 235 static struct platform_driver panel_dpi_driver = {
 236         .probe = panel_dpi_probe,
 237         .remove = panel_dpi_remove,
 238         .driver = {
 239                 .name = "panel-dpi",
 240                 .of_match_table = panel_dpi_of_match,
 241         },
 242 };
 243
 244 module_platform_driver(panel_dpi_driver);
 245
 246 MODULE_AUTHOR("Tomi Valkeinen <tomi.valkeinen@ti.com>");
 247 MODULE_DESCRIPTION("Generic MIPI DPI Panel Driver");
 248 MODULE_LICENSE("GPL");