drivers/staging/imx-drm/parallel-display.c

   1 /*
   2  * i.MX drm driver - parallel display implementation
   3  *
   4  * Copyright (C) 2012 Sascha Hauer, Pengutronix
   5  *
   6  * This program is free software; you can redistribute it and/or
   7  * modify it under the terms of the GNU General Public License
   8  * as published by the Free Software Foundation; either version 2
   9  * of the License, or (at your option) any later version.
  10  * This program is distributed in the hope that it will be useful,
  11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13  * GNU General Public License for more details.
  14  *
  15  * You should have received a copy of the GNU General Public License
  16  * along with this program; if not, write to the Free Software
  17  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
  18  * MA 02110-1301, USA.
  19  */
  20
  21 #include <linux/module.h>
  22 #include <drm/drmP.h>
  23 #include <drm/drm_fb_helper.h>
  24 #include <drm/drm_crtc_helper.h>
  25 #include <linux/videodev2.h>
  26 #include <video/of_display_timing.h>
  27
  28 #include "imx-drm.h"
  29
  30 #define con_to_imxpd(x) container_of(x, struct imx_parallel_display, connector)
  31 #define enc_to_imxpd(x) container_of(x, struct imx_parallel_display, encoder)
  32
  33 struct imx_parallel_display {
  34         struct drm_connector connector;
  35         struct imx_drm_connector *imx_drm_connector;
  36         struct drm_encoder encoder;
  37         struct imx_drm_encoder *imx_drm_encoder;
  38         struct device *dev;
  39         void *edid;
  40         int edid_len;
  41         u32 interface_pix_fmt;
  42         int mode_valid;
  43         struct drm_display_mode mode;
  44 };
  45
  46 static enum drm_connector_status imx_pd_connector_detect(
  47                 struct drm_connector *connector, bool force)
  48 {
  49         return connector_status_connected;
  50 }
  51
  52 static void imx_pd_connector_destroy(struct drm_connector *connector)
  53 {
  54         /* do not free here */
  55 }
  56
  57 static int imx_pd_connector_get_modes(struct drm_connector *connector)
  58 {
  59         struct imx_parallel_display *imxpd = con_to_imxpd(connector);
  60         struct device_node *np = imxpd->dev->of_node;
  61         int num_modes = 0;
  62
  63         if (imxpd->edid) {
  64                 drm_mode_connector_update_edid_property(connector, imxpd->edid);
  65                 num_modes = drm_add_edid_modes(connector, imxpd->edid);
  66         }
  67
  68         if (imxpd->mode_valid) {
  69                 struct drm_display_mode *mode = drm_mode_create(connector->dev);
  70                 drm_mode_copy(mode, &imxpd->mode);
  71                 mode->type |= DRM_MODE_TYPE_DRIVER | DRM_MODE_TYPE_PREFERRED,
  72                 drm_mode_probed_add(connector, mode);
  73                 num_modes++;
  74         }
  75
  76         if (np) {
  77                 struct drm_display_mode *mode = drm_mode_create(connector->dev);
  78                 of_get_drm_display_mode(np, &imxpd->mode, OF_USE_NATIVE_MODE);
  79                 drm_mode_copy(mode, &imxpd->mode);
  80                 mode->type |= DRM_MODE_TYPE_DRIVER | DRM_MODE_TYPE_PREFERRED,
  81                 drm_mode_probed_add(connector, mode);
  82                 num_modes++;
  83         }
  84
  85         return num_modes;
  86 }
  87
  88 static int imx_pd_connector_mode_valid(struct drm_connector *connector,
  89                           struct drm_display_mode *mode)
  90 {
  91         return 0;
  92 }
  93
  94 static struct drm_encoder *imx_pd_connector_best_encoder(
  95                 struct drm_connector *connector)
  96 {
  97         struct imx_parallel_display *imxpd = con_to_imxpd(connector);
  98
  99         return &imxpd->encoder;
 100 }
 101
 102 static void imx_pd_encoder_dpms(struct drm_encoder *encoder, int mode)
 103 {
 104 }
 105
 106 static bool imx_pd_encoder_mode_fixup(struct drm_encoder *encoder,
 107                            const struct drm_display_mode *mode,
 108                            struct drm_display_mode *adjusted_mode)
 109 {
 110         return true;
 111 }
 112
 113 static void imx_pd_encoder_prepare(struct drm_encoder *encoder)
 114 {
 115         struct imx_parallel_display *imxpd = enc_to_imxpd(encoder);
 116
 117         imx_drm_crtc_panel_format(encoder->crtc, DRM_MODE_ENCODER_NONE,
 118                         imxpd->interface_pix_fmt);
 119 }
 120
 121 static void imx_pd_encoder_commit(struct drm_encoder *encoder)
 122 {
 123 }
 124
 125 static void imx_pd_encoder_mode_set(struct drm_encoder *encoder,
 126                          struct drm_display_mode *mode,
 127                          struct drm_display_mode *adjusted_mode)
 128 {
 129 }
 130
 131 static void imx_pd_encoder_disable(struct drm_encoder *encoder)
 132 {
 133 }
 134
 135 static void imx_pd_encoder_destroy(struct drm_encoder *encoder)
 136 {
 137         /* do not free here */
 138 }
 139
 140 static struct drm_connector_funcs imx_pd_connector_funcs = {
 141         .dpms = drm_helper_connector_dpms,
 142         .fill_modes = drm_helper_probe_single_connector_modes,
 143         .detect = imx_pd_connector_detect,
 144         .destroy = imx_pd_connector_destroy,
 145 };
 146
 147 static struct drm_connector_helper_funcs imx_pd_connector_helper_funcs = {
 148         .get_modes = imx_pd_connector_get_modes,
 149         .best_encoder = imx_pd_connector_best_encoder,
 150         .mode_valid = imx_pd_connector_mode_valid,
 151 };
 152
 153 static struct drm_encoder_funcs imx_pd_encoder_funcs = {
 154         .destroy = imx_pd_encoder_destroy,
 155 };
 156
 157 static struct drm_encoder_helper_funcs imx_pd_encoder_helper_funcs = {
 158         .dpms = imx_pd_encoder_dpms,
 159         .mode_fixup = imx_pd_encoder_mode_fixup,
 160         .prepare = imx_pd_encoder_prepare,
 161         .commit = imx_pd_encoder_commit,
 162         .mode_set = imx_pd_encoder_mode_set,
 163         .disable = imx_pd_encoder_disable,
 164 };
 165
 166 static int imx_pd_register(struct imx_parallel_display *imxpd)
 167 {
 168         int ret;
 169
 170         drm_mode_connector_attach_encoder(&imxpd->connector, &imxpd->encoder);
 171
 172         imxpd->connector.funcs = &imx_pd_connector_funcs;
 173         imxpd->encoder.funcs = &imx_pd_encoder_funcs;
 174
 175         imxpd->encoder.encoder_type = DRM_MODE_ENCODER_NONE;
 176         imxpd->connector.connector_type = DRM_MODE_CONNECTOR_VGA;
 177
 178         drm_encoder_helper_add(&imxpd->encoder, &imx_pd_encoder_helper_funcs);
 179         ret = imx_drm_add_encoder(&imxpd->encoder, &imxpd->imx_drm_encoder,
 180                         THIS_MODULE);
 181         if (ret) {
 182                 dev_err(imxpd->dev, "adding encoder failed with %d\n", ret);
 183                 return ret;
 184         }
 185
 186         drm_connector_helper_add(&imxpd->connector,
 187                         &imx_pd_connector_helper_funcs);
 188
 189         ret = imx_drm_add_connector(&imxpd->connector,
 190                         &imxpd->imx_drm_connector, THIS_MODULE);
 191         if (ret) {
 192                 imx_drm_remove_encoder(imxpd->imx_drm_encoder);
 193                 dev_err(imxpd->dev, "adding connector failed with %d\n", ret);
 194                 return ret;
 195         }
 196
 197         imxpd->connector.encoder = &imxpd->encoder;
 198
 199         return 0;
 200 }
 201
 202 static int imx_pd_probe(struct platform_device *pdev)
 203 {
 204         struct device_node *np = pdev->dev.of_node;
 205         const u8 *edidp;
 206         struct imx_parallel_display *imxpd;
 207         int ret;
 208         const char *fmt;
 209
 210         imxpd = devm_kzalloc(&pdev->dev, sizeof(*imxpd), GFP_KERNEL);
 211         if (!imxpd)
 212                 return -ENOMEM;
 213
 214         edidp = of_get_property(np, "edid", &imxpd->edid_len);
 215         if (edidp)
 216                 imxpd->edid = kmemdup(edidp, imxpd->edid_len, GFP_KERNEL);
 217
 218         ret = of_property_read_string(np, "interface-pix-fmt", &fmt);
 219         if (!ret) {
 220                 if (!strcmp(fmt, "rgb24"))
 221                         imxpd->interface_pix_fmt = V4L2_PIX_FMT_RGB24;
 222                 else if (!strcmp(fmt, "rgb565"))
 223                         imxpd->interface_pix_fmt = V4L2_PIX_FMT_RGB565;
 224                 else if (!strcmp(fmt, "bgr666"))
 225                         imxpd->interface_pix_fmt = V4L2_PIX_FMT_BGR666;
 226         }
 227
 228         imxpd->dev = &pdev->dev;
 229
 230         ret = imx_pd_register(imxpd);
 231         if (ret)
 232                 return ret;
 233
 234         ret = imx_drm_encoder_add_possible_crtcs(imxpd->imx_drm_encoder, np);
 235
 236         platform_set_drvdata(pdev, imxpd);
 237
 238         return 0;
 239 }
 240
 241 static int imx_pd_remove(struct platform_device *pdev)
 242 {
 243         struct imx_parallel_display *imxpd = platform_get_drvdata(pdev);
 244         struct drm_connector *connector = &imxpd->connector;
 245         struct drm_encoder *encoder = &imxpd->encoder;
 246
 247         drm_mode_connector_detach_encoder(connector, encoder);
 248
 249         imx_drm_remove_connector(imxpd->imx_drm_connector);
 250         imx_drm_remove_encoder(imxpd->imx_drm_encoder);
 251
 252         return 0;
 253 }
 254
 255 static const struct of_device_id imx_pd_dt_ids[] = {
 256         { .compatible = "fsl,imx-parallel-display", },
 257         { /* sentinel */ }
 258 };
 259 MODULE_DEVICE_TABLE(of, imx_pd_dt_ids);
 260
 261 static struct platform_driver imx_pd_driver = {
 262         .probe          = imx_pd_probe,
 263         .remove         = imx_pd_remove,
 264         .driver         = {
 265                 .of_match_table = imx_pd_dt_ids,
 266                 .name   = "imx-parallel-display",
 267                 .owner  = THIS_MODULE,
 268         },
 269 };
 270
 271 module_platform_driver(imx_pd_driver);
 272
 273 MODULE_DESCRIPTION("i.MX parallel display driver");
 274 MODULE_AUTHOR("Sascha Hauer, Pengutronix");
 275 MODULE_LICENSE("GPL");
 276 MODULE_ALIAS("platform:imx-parallel-display");