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
  91         if (ddata->backlight) {
  92                 ddata->backlight->props.power = FB_BLANK_UNBLANK;
  93                 backlight_update_status(ddata->backlight);
  94         }
  95
  96         dssdev->state = OMAP_DSS_DISPLAY_ACTIVE;
  97
  98         return 0;
  99 }
 100
 101 static void panel_dpi_disable(struct omap_dss_device *dssdev)
 102 {
 103         struct panel_drv_data *ddata = to_panel_data(dssdev);
 104         struct omap_dss_device *in = ddata->in;
 105
 106         if (!omapdss_device_is_enabled(dssdev))
 107                 return;
 108
 109         if (ddata->backlight) {
 110                 ddata->backlight->props.power = FB_BLANK_POWERDOWN;
 111                 backlight_update_status(ddata->backlight);
 112         }
 113
 114         gpiod_set_value_cansleep(ddata->enable_gpio, 0);
 115         regulator_disable(ddata->vcc_supply);
 116
 117         in->ops.dpi->disable(in);
 118
 119         dssdev->state = OMAP_DSS_DISPLAY_DISABLED;
 120 }
 121
 122 static void panel_dpi_set_timings(struct omap_dss_device *dssdev,
 123                                   struct videomode *vm)
 124 {
 125         struct panel_drv_data *ddata = to_panel_data(dssdev);
 126         struct omap_dss_device *in = ddata->in;
 127
 128         ddata->vm = *vm;
 129         dssdev->panel.vm = *vm;
 130
 131         in->ops.dpi->set_timings(in, vm);
 132 }
 133
 134 static void panel_dpi_get_timings(struct omap_dss_device *dssdev,
 135                                   struct videomode *vm)
 136 {
 137         struct panel_drv_data *ddata = to_panel_data(dssdev);
 138
 139         *vm = ddata->vm;
 140 }
 141
 142 static int panel_dpi_check_timings(struct omap_dss_device *dssdev,
 143                                    struct videomode *vm)
 144 {
 145         struct panel_drv_data *ddata = to_panel_data(dssdev);
 146         struct omap_dss_device *in = ddata->in;
 147
 148         return in->ops.dpi->check_timings(in, vm);
 149 }
 150
 151 static struct omap_dss_driver panel_dpi_ops = {
 152         .connect        = panel_dpi_connect,
 153         .disconnect     = panel_dpi_disconnect,
 154
 155         .enable         = panel_dpi_enable,
 156         .disable        = panel_dpi_disable,
 157
 158         .set_timings    = panel_dpi_set_timings,
 159         .get_timings    = panel_dpi_get_timings,
 160         .check_timings  = panel_dpi_check_timings,
 161 };
 162
 163 static int panel_dpi_probe_of(struct platform_device *pdev)
 164 {
 165         struct panel_drv_data *ddata = platform_get_drvdata(pdev);
 166         struct device_node *node = pdev->dev.of_node;
 167         struct device_node *bl_node;
 168         struct omap_dss_device *in;
 169         int r;
 170         struct display_timing timing;
 171         struct gpio_desc *gpio;
 172
 173         gpio = devm_gpiod_get_optional(&pdev->dev, "enable", GPIOD_OUT_LOW);
 174         if (IS_ERR(gpio))
 175                 return PTR_ERR(gpio);
 176
 177         ddata->enable_gpio = gpio;
 178
 179         /*
 180          * Many different panels are supported by this driver and there are
 181          * probably very different needs for their reset pins in regards to
 182          * timing and order relative to the enable gpio. So for now it's just
 183          * ensured that the reset line isn't active.
 184          */
 185         gpio = devm_gpiod_get_optional(&pdev->dev, "reset", GPIOD_OUT_LOW);
 186         if (IS_ERR(gpio))
 187                 return PTR_ERR(gpio);
 188
 189         ddata->vcc_supply = devm_regulator_get(&pdev->dev, "vcc");
 190         if (IS_ERR(ddata->vcc_supply))
 191                 return PTR_ERR(ddata->vcc_supply);
 192
 193         bl_node = of_parse_phandle(node, "backlight", 0);
 194         if (bl_node) {
 195                 ddata->backlight = of_find_backlight_by_node(bl_node);
 196                 of_node_put(bl_node);
 197
 198                 if (!ddata->backlight)
 199                         return -EPROBE_DEFER;
 200         }
 201
 202         r = of_get_display_timing(node, "panel-timing", &timing);
 203         if (r) {
 204                 dev_err(&pdev->dev, "failed to get video timing\n");
 205                 goto error_free_backlight;
 206         }
 207
 208         videomode_from_timing(&timing, &ddata->vm);
 209
 210         in = omapdss_of_find_source_for_first_ep(node);
 211         if (IS_ERR(in)) {
 212                 dev_err(&pdev->dev, "failed to find video source\n");
 213                 r = PTR_ERR(in);
 214                 goto error_free_backlight;
 215         }
 216
 217         ddata->in = in;
 218
 219         return 0;
 220
 221 error_free_backlight:
 222         if (ddata->backlight)
 223                 put_device(&ddata->backlight->dev);
 224
 225         return r;
 226 }
 227
 228 static int panel_dpi_probe(struct platform_device *pdev)
 229 {
 230         struct panel_drv_data *ddata;
 231         struct omap_dss_device *dssdev;
 232         int r;
 233
 234         if (!pdev->dev.of_node)
 235                 return -ENODEV;
 236
 237         ddata = devm_kzalloc(&pdev->dev, sizeof(*ddata), GFP_KERNEL);
 238         if (ddata == NULL)
 239                 return -ENOMEM;
 240
 241         platform_set_drvdata(pdev, ddata);
 242
 243         r = panel_dpi_probe_of(pdev);
 244         if (r)
 245                 return r;
 246
 247         dssdev = &ddata->dssdev;
 248         dssdev->dev = &pdev->dev;
 249         dssdev->driver = &panel_dpi_ops;
 250         dssdev->type = OMAP_DISPLAY_TYPE_DPI;
 251         dssdev->owner = THIS_MODULE;
 252         dssdev->panel.vm = ddata->vm;
 253
 254         r = omapdss_register_display(dssdev);
 255         if (r) {
 256                 dev_err(&pdev->dev, "Failed to register panel\n");
 257                 goto err_reg;
 258         }
 259
 260         return 0;
 261
 262 err_reg:
 263         omap_dss_put_device(ddata->in);
 264         return r;
 265 }
 266
 267 static int __exit panel_dpi_remove(struct platform_device *pdev)
 268 {
 269         struct panel_drv_data *ddata = platform_get_drvdata(pdev);
 270         struct omap_dss_device *dssdev = &ddata->dssdev;
 271         struct omap_dss_device *in = ddata->in;
 272
 273         omapdss_unregister_display(dssdev);
 274
 275         panel_dpi_disable(dssdev);
 276         panel_dpi_disconnect(dssdev);
 277
 278         omap_dss_put_device(in);
 279
 280         if (ddata->backlight)
 281                 put_device(&ddata->backlight->dev);
 282
 283         return 0;
 284 }
 285
 286 static const struct of_device_id panel_dpi_of_match[] = {
 287         { .compatible = "omapdss,panel-dpi", },
 288         {},
 289 };
 290
 291 MODULE_DEVICE_TABLE(of, panel_dpi_of_match);
 292
 293 static struct platform_driver panel_dpi_driver = {
 294         .probe = panel_dpi_probe,
 295         .remove = __exit_p(panel_dpi_remove),
 296         .driver = {
 297                 .name = "panel-dpi",
 298                 .of_match_table = panel_dpi_of_match,
 299                 .suppress_bind_attrs = true,
 300         },
 301 };
 302
 303 module_platform_driver(panel_dpi_driver);
 304
 305 MODULE_AUTHOR("Tomi Valkeinen <tomi.valkeinen@ti.com>");
 306 MODULE_DESCRIPTION("Generic MIPI DPI Panel Driver");
 307 MODULE_LICENSE("GPL");