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

   1 /*
   2  * Generic MIPI DPI Panel Driver
   3  *
   4  * Copyright (C) 2013 Texas Instruments Incorporated - http://www.ti.com/
   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/consumer.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/regulator/consumer.h>
  18 #include <linux/backlight.h>
  19
  20 #include <video/of_display_timing.h>
  21
  22 #include "../dss/omapdss.h"
  23
  24 struct panel_drv_data {
  25         struct omap_dss_device dssdev;
  26         struct omap_dss_device *in;
  27
  28         struct videomode vm;
  29
  30         struct backlight_device *backlight;
  31
  32         struct gpio_desc *enable_gpio;
  33         struct regulator *vcc_supply;
  34 };
  35
  36 #define to_panel_data(p) container_of(p, struct panel_drv_data, dssdev)
  37
  38 static int panel_dpi_connect(struct omap_dss_device *dssdev)
  39 {
  40         struct panel_drv_data *ddata = to_panel_data(dssdev);
  41         struct omap_dss_device *in = ddata->in;
  42         int r;
  43
  44         if (omapdss_device_is_connected(dssdev))
  45                 return 0;
  46
  47         r = in->ops.dpi->connect(in, dssdev);
  48         if (r)
  49                 return r;
  50
  51         return 0;
  52 }
  53
  54 static void panel_dpi_disconnect(struct omap_dss_device *dssdev)
  55 {
  56         struct panel_drv_data *ddata = to_panel_data(dssdev);
  57         struct omap_dss_device *in = ddata->in;
  58
  59         if (!omapdss_device_is_connected(dssdev))
  60                 return;
  61
  62         in->ops.dpi->disconnect(in, dssdev);
  63 }
  64
  65 static int panel_dpi_enable(struct omap_dss_device *dssdev)
  66 {
  67         struct panel_drv_data *ddata = to_panel_data(dssdev);
  68         struct omap_dss_device *in = ddata->in;
  69         int r;
  70
  71         if (!omapdss_device_is_connected(dssdev))
  72                 return -ENODEV;
  73
  74         if (omapdss_device_is_enabled(dssdev))
  75                 return 0;
  76
  77         in->ops.dpi->set_timings(in, &ddata->vm);
  78
  79         r = in->ops.dpi->enable(in);
  80         if (r)
  81                 return r;
  82
  83         r = regulator_enable(ddata->vcc_supply);
  84         if (r) {
  85                 in->ops.dpi->disable(in);
  86                 return r;
  87         }
  88
  89         gpiod_set_value_cansleep(ddata->enable_gpio, 1);
  90         backlight_enable(ddata->backlight);
  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         backlight_disable(ddata->backlight);
 106
 107         gpiod_set_value_cansleep(ddata->enable_gpio, 0);
 108         regulator_disable(ddata->vcc_supply);
 109
 110         in->ops.dpi->disable(in);
 111
 112         dssdev->state = OMAP_DSS_DISPLAY_DISABLED;
 113 }
 114
 115 static void panel_dpi_set_timings(struct omap_dss_device *dssdev,
 116                                   struct videomode *vm)
 117 {
 118         struct panel_drv_data *ddata = to_panel_data(dssdev);
 119         struct omap_dss_device *in = ddata->in;
 120
 121         ddata->vm = *vm;
 122         dssdev->panel.vm = *vm;
 123
 124         in->ops.dpi->set_timings(in, vm);
 125 }
 126
 127 static void panel_dpi_get_timings(struct omap_dss_device *dssdev,
 128                                   struct videomode *vm)
 129 {
 130         struct panel_drv_data *ddata = to_panel_data(dssdev);
 131
 132         *vm = ddata->vm;
 133 }
 134
 135 static int panel_dpi_check_timings(struct omap_dss_device *dssdev,
 136                                    struct videomode *vm)
 137 {
 138         struct panel_drv_data *ddata = to_panel_data(dssdev);
 139         struct omap_dss_device *in = ddata->in;
 140
 141         return in->ops.dpi->check_timings(in, vm);
 142 }
 143
 144 static struct omap_dss_driver panel_dpi_ops = {
 145         .connect        = panel_dpi_connect,
 146         .disconnect     = panel_dpi_disconnect,
 147
 148         .enable         = panel_dpi_enable,
 149         .disable        = panel_dpi_disable,
 150
 151         .set_timings    = panel_dpi_set_timings,
 152         .get_timings    = panel_dpi_get_timings,
 153         .check_timings  = panel_dpi_check_timings,
 154 };
 155
 156 static int panel_dpi_probe_of(struct platform_device *pdev)
 157 {
 158         struct panel_drv_data *ddata = platform_get_drvdata(pdev);
 159         struct device_node *node = pdev->dev.of_node;
 160         struct omap_dss_device *in;
 161         int r;
 162         struct display_timing timing;
 163         struct gpio_desc *gpio;
 164
 165         gpio = devm_gpiod_get_optional(&pdev->dev, "enable", GPIOD_OUT_LOW);
 166         if (IS_ERR(gpio))
 167                 return PTR_ERR(gpio);
 168
 169         ddata->enable_gpio = gpio;
 170
 171         /*
 172          * Many different panels are supported by this driver and there are
 173          * probably very different needs for their reset pins in regards to
 174          * timing and order relative to the enable gpio. So for now it's just
 175          * ensured that the reset line isn't active.
 176          */
 177         gpio = devm_gpiod_get_optional(&pdev->dev, "reset", GPIOD_OUT_LOW);
 178         if (IS_ERR(gpio))
 179                 return PTR_ERR(gpio);
 180
 181         ddata->vcc_supply = devm_regulator_get(&pdev->dev, "vcc");
 182         if (IS_ERR(ddata->vcc_supply))
 183                 return PTR_ERR(ddata->vcc_supply);
 184
 185         ddata->backlight = devm_of_find_backlight(&pdev->dev);
 186
 187         if (IS_ERR(ddata->backlight))
 188                 return PTR_ERR(ddata->backlight);
 189
 190         r = of_get_display_timing(node, "panel-timing", &timing);
 191         if (r) {
 192                 dev_err(&pdev->dev, "failed to get video timing\n");
 193                 return r;
 194         }
 195
 196         videomode_from_timing(&timing, &ddata->vm);
 197
 198         in = omapdss_of_find_source_for_first_ep(node);
 199         if (IS_ERR(in)) {
 200                 dev_err(&pdev->dev, "failed to find video source\n");
 201                 return PTR_ERR(in);
 202         }
 203
 204         ddata->in = in;
 205
 206         return 0;
 207 }
 208
 209 static int panel_dpi_probe(struct platform_device *pdev)
 210 {
 211         struct panel_drv_data *ddata;
 212         struct omap_dss_device *dssdev;
 213         int r;
 214
 215         if (!pdev->dev.of_node)
 216                 return -ENODEV;
 217
 218         ddata = devm_kzalloc(&pdev->dev, sizeof(*ddata), GFP_KERNEL);
 219         if (ddata == NULL)
 220                 return -ENOMEM;
 221
 222         platform_set_drvdata(pdev, ddata);
 223
 224         r = panel_dpi_probe_of(pdev);
 225         if (r)
 226                 return r;
 227
 228         dssdev = &ddata->dssdev;
 229         dssdev->dev = &pdev->dev;
 230         dssdev->driver = &panel_dpi_ops;
 231         dssdev->type = OMAP_DISPLAY_TYPE_DPI;
 232         dssdev->owner = THIS_MODULE;
 233         dssdev->panel.vm = ddata->vm;
 234
 235         r = omapdss_register_display(dssdev);
 236         if (r) {
 237                 dev_err(&pdev->dev, "Failed to register panel\n");
 238                 goto err_reg;
 239         }
 240
 241         return 0;
 242
 243 err_reg:
 244         omap_dss_put_device(ddata->in);
 245         return r;
 246 }
 247
 248 static int __exit panel_dpi_remove(struct platform_device *pdev)
 249 {
 250         struct panel_drv_data *ddata = platform_get_drvdata(pdev);
 251         struct omap_dss_device *dssdev = &ddata->dssdev;
 252         struct omap_dss_device *in = ddata->in;
 253
 254         omapdss_unregister_display(dssdev);
 255
 256         panel_dpi_disable(dssdev);
 257         panel_dpi_disconnect(dssdev);
 258
 259         omap_dss_put_device(in);
 260
 261         return 0;
 262 }
 263
 264 static const struct of_device_id panel_dpi_of_match[] = {
 265         { .compatible = "omapdss,panel-dpi", },
 266         {},
 267 };
 268
 269 MODULE_DEVICE_TABLE(of, panel_dpi_of_match);
 270
 271 static struct platform_driver panel_dpi_driver = {
 272         .probe = panel_dpi_probe,
 273         .remove = __exit_p(panel_dpi_remove),
 274         .driver = {
 275                 .name = "panel-dpi",
 276                 .of_match_table = panel_dpi_of_match,
 277                 .suppress_bind_attrs = true,
 278         },
 279 };
 280
 281 module_platform_driver(panel_dpi_driver);
 282
 283 MODULE_AUTHOR("Tomi Valkeinen <tomi.valkeinen@ti.com>");
 284 MODULE_DESCRIPTION("Generic MIPI DPI Panel Driver");
 285 MODULE_LICENSE("GPL");