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;
  42         int r;
  43
  44         if (omapdss_device_is_connected(dssdev))
  45                 return 0;
  46
  47         in = omapdss_of_find_source_for_first_ep(dssdev->dev->of_node);
  48         if (IS_ERR(in)) {
  49                 dev_err(dssdev->dev, "failed to find video source\n");
  50                 return PTR_ERR(in);
  51         }
  52
  53         r = in->ops.dpi->connect(in, dssdev);
  54         if (r) {
  55                 omap_dss_put_device(in);
  56                 return r;
  57         }
  58
  59         ddata->in = in;
  60         return 0;
  61 }
  62
  63 static void panel_dpi_disconnect(struct omap_dss_device *dssdev)
  64 {
  65         struct panel_drv_data *ddata = to_panel_data(dssdev);
  66         struct omap_dss_device *in = ddata->in;
  67
  68         if (!omapdss_device_is_connected(dssdev))
  69                 return;
  70
  71         in->ops.dpi->disconnect(in, dssdev);
  72
  73         omap_dss_put_device(in);
  74         ddata->in = NULL;
  75 }
  76
  77 static int panel_dpi_enable(struct omap_dss_device *dssdev)
  78 {
  79         struct panel_drv_data *ddata = to_panel_data(dssdev);
  80         struct omap_dss_device *in = ddata->in;
  81         int r;
  82
  83         if (!omapdss_device_is_connected(dssdev))
  84                 return -ENODEV;
  85
  86         if (omapdss_device_is_enabled(dssdev))
  87                 return 0;
  88
  89         in->ops.dpi->set_timings(in, &ddata->vm);
  90
  91         r = in->ops.dpi->enable(in);
  92         if (r)
  93                 return r;
  94
  95         r = regulator_enable(ddata->vcc_supply);
  96         if (r) {
  97                 in->ops.dpi->disable(in);
  98                 return r;
  99         }
 100
 101         gpiod_set_value_cansleep(ddata->enable_gpio, 1);
 102         backlight_enable(ddata->backlight);
 103
 104         dssdev->state = OMAP_DSS_DISPLAY_ACTIVE;
 105
 106         return 0;
 107 }
 108
 109 static void panel_dpi_disable(struct omap_dss_device *dssdev)
 110 {
 111         struct panel_drv_data *ddata = to_panel_data(dssdev);
 112         struct omap_dss_device *in = ddata->in;
 113
 114         if (!omapdss_device_is_enabled(dssdev))
 115                 return;
 116
 117         backlight_disable(ddata->backlight);
 118
 119         gpiod_set_value_cansleep(ddata->enable_gpio, 0);
 120         regulator_disable(ddata->vcc_supply);
 121
 122         in->ops.dpi->disable(in);
 123
 124         dssdev->state = OMAP_DSS_DISPLAY_DISABLED;
 125 }
 126
 127 static void panel_dpi_set_timings(struct omap_dss_device *dssdev,
 128                                   struct videomode *vm)
 129 {
 130         struct panel_drv_data *ddata = to_panel_data(dssdev);
 131         struct omap_dss_device *in = ddata->in;
 132
 133         ddata->vm = *vm;
 134         dssdev->panel.vm = *vm;
 135
 136         in->ops.dpi->set_timings(in, vm);
 137 }
 138
 139 static void panel_dpi_get_timings(struct omap_dss_device *dssdev,
 140                                   struct videomode *vm)
 141 {
 142         struct panel_drv_data *ddata = to_panel_data(dssdev);
 143
 144         *vm = ddata->vm;
 145 }
 146
 147 static int panel_dpi_check_timings(struct omap_dss_device *dssdev,
 148                                    struct videomode *vm)
 149 {
 150         struct panel_drv_data *ddata = to_panel_data(dssdev);
 151         struct omap_dss_device *in = ddata->in;
 152
 153         return in->ops.dpi->check_timings(in, vm);
 154 }
 155
 156 static struct omap_dss_driver panel_dpi_ops = {
 157         .connect        = panel_dpi_connect,
 158         .disconnect     = panel_dpi_disconnect,
 159
 160         .enable         = panel_dpi_enable,
 161         .disable        = panel_dpi_disable,
 162
 163         .set_timings    = panel_dpi_set_timings,
 164         .get_timings    = panel_dpi_get_timings,
 165         .check_timings  = panel_dpi_check_timings,
 166 };
 167
 168 static int panel_dpi_probe_of(struct platform_device *pdev)
 169 {
 170         struct panel_drv_data *ddata = platform_get_drvdata(pdev);
 171         struct device_node *node = pdev->dev.of_node;
 172         int r;
 173         struct display_timing timing;
 174         struct gpio_desc *gpio;
 175
 176         gpio = devm_gpiod_get_optional(&pdev->dev, "enable", GPIOD_OUT_LOW);
 177         if (IS_ERR(gpio))
 178                 return PTR_ERR(gpio);
 179
 180         ddata->enable_gpio = gpio;
 181
 182         /*
 183          * Many different panels are supported by this driver and there are
 184          * probably very different needs for their reset pins in regards to
 185          * timing and order relative to the enable gpio. So for now it's just
 186          * ensured that the reset line isn't active.
 187          */
 188         gpio = devm_gpiod_get_optional(&pdev->dev, "reset", GPIOD_OUT_LOW);
 189         if (IS_ERR(gpio))
 190                 return PTR_ERR(gpio);
 191
 192         ddata->vcc_supply = devm_regulator_get(&pdev->dev, "vcc");
 193         if (IS_ERR(ddata->vcc_supply))
 194                 return PTR_ERR(ddata->vcc_supply);
 195
 196         ddata->backlight = devm_of_find_backlight(&pdev->dev);
 197
 198         if (IS_ERR(ddata->backlight))
 199                 return PTR_ERR(ddata->backlight);
 200
 201         r = of_get_display_timing(node, "panel-timing", &timing);
 202         if (r) {
 203                 dev_err(&pdev->dev, "failed to get video timing\n");
 204                 return r;
 205         }
 206
 207         videomode_from_timing(&timing, &ddata->vm);
 208
 209         return 0;
 210 }
 211
 212 static int panel_dpi_probe(struct platform_device *pdev)
 213 {
 214         struct panel_drv_data *ddata;
 215         struct omap_dss_device *dssdev;
 216         int r;
 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                 return r;
 239         }
 240
 241         return 0;
 242 }
 243
 244 static int __exit panel_dpi_remove(struct platform_device *pdev)
 245 {
 246         struct panel_drv_data *ddata = platform_get_drvdata(pdev);
 247         struct omap_dss_device *dssdev = &ddata->dssdev;
 248
 249         omapdss_unregister_display(dssdev);
 250
 251         panel_dpi_disable(dssdev);
 252         panel_dpi_disconnect(dssdev);
 253
 254         return 0;
 255 }
 256
 257 static const struct of_device_id panel_dpi_of_match[] = {
 258         { .compatible = "omapdss,panel-dpi", },
 259         {},
 260 };
 261
 262 MODULE_DEVICE_TABLE(of, panel_dpi_of_match);
 263
 264 static struct platform_driver panel_dpi_driver = {
 265         .probe = panel_dpi_probe,
 266         .remove = __exit_p(panel_dpi_remove),
 267         .driver = {
 268                 .name = "panel-dpi",
 269                 .of_match_table = panel_dpi_of_match,
 270                 .suppress_bind_attrs = true,
 271         },
 272 };
 273
 274 module_platform_driver(panel_dpi_driver);
 275
 276 MODULE_AUTHOR("Tomi Valkeinen <tomi.valkeinen@ti.com>");
 277 MODULE_DESCRIPTION("Generic MIPI DPI Panel Driver");
 278 MODULE_LICENSE("GPL");