drivers/gpu/drm/omapdrm/displays/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/gpio/consumer.h>
  14 #include <linux/module.h>
  15 #include <linux/platform_device.h>
  16 #include <linux/slab.h>
  17 #include <linux/of.h>
  18 #include <linux/of_gpio.h>
  19
  20 #include <video/omapdss.h>
  21 #include <video/omap-panel-data.h>
  22 #include <video/of_display_timing.h>
  23
  24 struct panel_drv_data {
  25         struct omap_dss_device dssdev;
  26         struct omap_dss_device *in;
  27
  28         int data_lines;
  29
  30         struct omap_video_timings videomode;
  31
  32         /* used for non-DT boot, to be removed */
  33         int backlight_gpio;
  34
  35         struct gpio_desc *enable_gpio;
  36 };
  37
  38 #define to_panel_data(p) container_of(p, struct panel_drv_data, dssdev)
  39
  40 static int panel_dpi_connect(struct omap_dss_device *dssdev)
  41 {
  42         struct panel_drv_data *ddata = to_panel_data(dssdev);
  43         struct omap_dss_device *in = ddata->in;
  44         int r;
  45
  46         if (omapdss_device_is_connected(dssdev))
  47                 return 0;
  48
  49         r = in->ops.dpi->connect(in, dssdev);
  50         if (r)
  51                 return r;
  52
  53         return 0;
  54 }
  55
  56 static void panel_dpi_disconnect(struct omap_dss_device *dssdev)
  57 {
  58         struct panel_drv_data *ddata = to_panel_data(dssdev);
  59         struct omap_dss_device *in = ddata->in;
  60
  61         if (!omapdss_device_is_connected(dssdev))
  62                 return;
  63
  64         in->ops.dpi->disconnect(in, dssdev);
  65 }
  66
  67 static int panel_dpi_enable(struct omap_dss_device *dssdev)
  68 {
  69         struct panel_drv_data *ddata = to_panel_data(dssdev);
  70         struct omap_dss_device *in = ddata->in;
  71         int r;
  72
  73         if (!omapdss_device_is_connected(dssdev))
  74                 return -ENODEV;
  75
  76         if (omapdss_device_is_enabled(dssdev))
  77                 return 0;
  78
  79         if (ddata->data_lines)
  80                 in->ops.dpi->set_data_lines(in, ddata->data_lines);
  81         in->ops.dpi->set_timings(in, &ddata->videomode);
  82
  83         r = in->ops.dpi->enable(in);
  84         if (r)
  85                 return r;
  86
  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 (gpio_is_valid(ddata->backlight_gpio))
 106                 gpio_set_value_cansleep(ddata->backlight_gpio, 0);
 107
 108         gpiod_set_value_cansleep(ddata->enable_gpio, 0);
 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 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         ddata->videomode = *timings;
 122         dssdev->panel.timings = *timings;
 123
 124         in->ops.dpi->set_timings(in, timings);
 125 }
 126
 127 static void panel_dpi_get_timings(struct omap_dss_device *dssdev,
 128                 struct omap_video_timings *timings)
 129 {
 130         struct panel_drv_data *ddata = to_panel_data(dssdev);
 131
 132         *timings = ddata->videomode;
 133 }
 134
 135 static int panel_dpi_check_timings(struct omap_dss_device *dssdev,
 136                 struct omap_video_timings *timings)
 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, timings);
 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         .get_resolution = omapdss_default_get_resolution,
 156 };
 157
 158 static int panel_dpi_probe_pdata(struct platform_device *pdev)
 159 {
 160         const struct panel_dpi_platform_data *pdata;
 161         struct panel_drv_data *ddata = platform_get_drvdata(pdev);
 162         struct omap_dss_device *dssdev, *in;
 163         struct videomode vm;
 164         int r;
 165
 166         pdata = dev_get_platdata(&pdev->dev);
 167
 168         in = omap_dss_find_output(pdata->source);
 169         if (in == NULL) {
 170                 dev_err(&pdev->dev, "failed to find video source '%s'\n",
 171                                 pdata->source);
 172                 return -EPROBE_DEFER;
 173         }
 174
 175         ddata->in = in;
 176
 177         ddata->data_lines = pdata->data_lines;
 178
 179         videomode_from_timing(pdata->display_timing, &vm);
 180         videomode_to_omap_video_timings(&vm, &ddata->videomode);
 181
 182         dssdev = &ddata->dssdev;
 183         dssdev->name = pdata->name;
 184
 185         r = devm_gpio_request_one(&pdev->dev, pdata->enable_gpio,
 186                                         GPIOF_OUT_INIT_LOW, "panel enable");
 187         if (r)
 188                 goto err_gpio;
 189
 190         ddata->enable_gpio = gpio_to_desc(pdata->enable_gpio);
 191
 192         ddata->backlight_gpio = pdata->backlight_gpio;
 193
 194         return 0;
 195
 196 err_gpio:
 197         omap_dss_put_device(ddata->in);
 198         return r;
 199 }
 200
 201 static int panel_dpi_probe_of(struct platform_device *pdev)
 202 {
 203         struct panel_drv_data *ddata = platform_get_drvdata(pdev);
 204         struct device_node *node = pdev->dev.of_node;
 205         struct omap_dss_device *in;
 206         int r;
 207         struct display_timing timing;
 208         struct videomode vm;
 209         struct gpio_desc *gpio;
 210
 211         gpio = devm_gpiod_get_optional(&pdev->dev, "enable", GPIOD_OUT_LOW);
 212         if (IS_ERR(gpio))
 213                 return PTR_ERR(gpio);
 214
 215         ddata->enable_gpio = gpio;
 216
 217         ddata->backlight_gpio = -ENOENT;
 218
 219         r = of_get_display_timing(node, "panel-timing", &timing);
 220         if (r) {
 221                 dev_err(&pdev->dev, "failed to get video timing\n");
 222                 return r;
 223         }
 224
 225         videomode_from_timing(&timing, &vm);
 226         videomode_to_omap_video_timings(&vm, &ddata->videomode);
 227
 228         in = omapdss_of_find_source_for_first_ep(node);
 229         if (IS_ERR(in)) {
 230                 dev_err(&pdev->dev, "failed to find video source\n");
 231                 return PTR_ERR(in);
 232         }
 233
 234         ddata->in = in;
 235
 236         return 0;
 237 }
 238
 239 static int panel_dpi_probe(struct platform_device *pdev)
 240 {
 241         struct panel_drv_data *ddata;
 242         struct omap_dss_device *dssdev;
 243         int r;
 244
 245         ddata = devm_kzalloc(&pdev->dev, sizeof(*ddata), GFP_KERNEL);
 246         if (ddata == NULL)
 247                 return -ENOMEM;
 248
 249         platform_set_drvdata(pdev, ddata);
 250
 251         if (dev_get_platdata(&pdev->dev)) {
 252                 r = panel_dpi_probe_pdata(pdev);
 253                 if (r)
 254                         return r;
 255         } else if (pdev->dev.of_node) {
 256                 r = panel_dpi_probe_of(pdev);
 257                 if (r)
 258                         return r;
 259         } else {
 260                 return -ENODEV;
 261         }
 262
 263         if (gpio_is_valid(ddata->backlight_gpio)) {
 264                 r = devm_gpio_request_one(&pdev->dev, ddata->backlight_gpio,
 265                                 GPIOF_OUT_INIT_LOW, "panel backlight");
 266                 if (r)
 267                         goto err_gpio;
 268         }
 269
 270         dssdev = &ddata->dssdev;
 271         dssdev->dev = &pdev->dev;
 272         dssdev->driver = &panel_dpi_ops;
 273         dssdev->type = OMAP_DISPLAY_TYPE_DPI;
 274         dssdev->owner = THIS_MODULE;
 275         dssdev->panel.timings = ddata->videomode;
 276         dssdev->phy.dpi.data_lines = ddata->data_lines;
 277
 278         r = omapdss_register_display(dssdev);
 279         if (r) {
 280                 dev_err(&pdev->dev, "Failed to register panel\n");
 281                 goto err_reg;
 282         }
 283
 284         return 0;
 285
 286 err_reg:
 287 err_gpio:
 288         omap_dss_put_device(ddata->in);
 289         return r;
 290 }
 291
 292 static int __exit panel_dpi_remove(struct platform_device *pdev)
 293 {
 294         struct panel_drv_data *ddata = platform_get_drvdata(pdev);
 295         struct omap_dss_device *dssdev = &ddata->dssdev;
 296         struct omap_dss_device *in = ddata->in;
 297
 298         omapdss_unregister_display(dssdev);
 299
 300         panel_dpi_disable(dssdev);
 301         panel_dpi_disconnect(dssdev);
 302
 303         omap_dss_put_device(in);
 304
 305         return 0;
 306 }
 307
 308 static const struct of_device_id panel_dpi_of_match[] = {
 309         { .compatible = "omapdss,panel-dpi", },
 310         {},
 311 };
 312
 313 MODULE_DEVICE_TABLE(of, panel_dpi_of_match);
 314
 315 static struct platform_driver panel_dpi_driver = {
 316         .probe = panel_dpi_probe,
 317         .remove = __exit_p(panel_dpi_remove),
 318         .driver = {
 319                 .name = "panel-dpi",
 320                 .of_match_table = panel_dpi_of_match,
 321                 .suppress_bind_attrs = true,
 322         },
 323 };
 324
 325 module_platform_driver(panel_dpi_driver);
 326
 327 MODULE_AUTHOR("Tomi Valkeinen <tomi.valkeinen@ti.com>");
 328 MODULE_DESCRIPTION("Generic MIPI DPI Panel Driver");
 329 MODULE_LICENSE("GPL");