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
  27 #include "imx-drm.h"
  28
  29 #define con_to_imxpd(x) container_of(x, struct imx_parallel_display, connector)
  30 #define enc_to_imxpd(x) container_of(x, struct imx_parallel_display, encoder)
  31
  32 struct imx_parallel_display {
  33         struct drm_connector connector;
  34         struct imx_drm_connector *imx_drm_connector;
  35         struct drm_encoder encoder;
  36         struct imx_drm_encoder *imx_drm_encoder;
  37         struct device *dev;
  38         void *edid;
  39         int edid_len;
  40         u32 interface_pix_fmt;
  41         int mode_valid;
  42         struct drm_display_mode mode;
  43 };
  44
  45 static enum drm_connector_status imx_pd_connector_detect(
  46                 struct drm_connector *connector, bool force)
  47 {
  48         return connector_status_connected;
  49 }
  50
  51 static void imx_pd_connector_destroy(struct drm_connector *connector)
  52 {
  53         /* do not free here */
  54 }
  55
  56 static int imx_pd_connector_get_modes(struct drm_connector *connector)
  57 {
  58         struct imx_parallel_display *imxpd = con_to_imxpd(connector);
  59         struct device_node *np = imxpd->dev->of_node;
  60         int num_modes = 0;
  61
  62         if (imxpd->edid) {
  63                 drm_mode_connector_update_edid_property(connector, imxpd->edid);
  64                 num_modes = drm_add_edid_modes(connector, imxpd->edid);
  65         }
  66
  67         if (imxpd->mode_valid) {
  68                 struct drm_display_mode *mode = drm_mode_create(connector->dev);
  69                 drm_mode_copy(mode, &imxpd->mode);
  70                 mode->type |= DRM_MODE_TYPE_DRIVER | DRM_MODE_TYPE_PREFERRED,
  71                 drm_mode_probed_add(connector, mode);
  72                 num_modes++;
  73         }
  74
  75         if (np) {
  76                 struct drm_display_mode *mode = drm_mode_create(connector->dev);
  77                 of_get_drm_display_mode(np, &imxpd->mode, 0);
  78                 drm_mode_copy(mode, &imxpd->mode);
  79                 mode->type |= DRM_MODE_TYPE_DRIVER | DRM_MODE_TYPE_PREFERRED,
  80                 drm_mode_probed_add(connector, mode);
  81                 num_modes++;
  82         }
  83
  84         return num_modes;
  85 }
  86
  87 static int imx_pd_connector_mode_valid(struct drm_connector *connector,
  88                           struct drm_display_mode *mode)
  89 {
  90         return 0;
  91 }
  92
  93 static struct drm_encoder *imx_pd_connector_best_encoder(
  94                 struct drm_connector *connector)
  95 {
  96         struct imx_parallel_display *imxpd = con_to_imxpd(connector);
  97
  98         return &imxpd->encoder;
  99 }
 100
 101 static void imx_pd_encoder_dpms(struct drm_encoder *encoder, int mode)
 102 {
 103 }
 104
 105 static bool imx_pd_encoder_mode_fixup(struct drm_encoder *encoder,
 106                            const struct drm_display_mode *mode,
 107                            struct drm_display_mode *adjusted_mode)
 108 {
 109         return true;
 110 }
 111
 112 static void imx_pd_encoder_prepare(struct drm_encoder *encoder)
 113 {
 114         struct imx_parallel_display *imxpd = enc_to_imxpd(encoder);
 115
 116         imx_drm_crtc_panel_format(encoder->crtc, DRM_MODE_ENCODER_NONE,
 117                         imxpd->interface_pix_fmt);
 118 }
 119
 120 static void imx_pd_encoder_commit(struct drm_encoder *encoder)
 121 {
 122 }
 123
 124 static void imx_pd_encoder_mode_set(struct drm_encoder *encoder,
 125                          struct drm_display_mode *mode,
 126                          struct drm_display_mode *adjusted_mode)
 127 {
 128 }
 129
 130 static void imx_pd_encoder_disable(struct drm_encoder *encoder)
 131 {
 132 }
 133
 134 static void imx_pd_encoder_destroy(struct drm_encoder *encoder)
 135 {
 136         /* do not free here */
 137 }
 138
 139 static struct drm_connector_funcs imx_pd_connector_funcs = {
 140         .dpms = drm_helper_connector_dpms,
 141         .fill_modes = drm_helper_probe_single_connector_modes,
 142         .detect = imx_pd_connector_detect,
 143         .destroy = imx_pd_connector_destroy,
 144 };
 145
 146 static struct drm_connector_helper_funcs imx_pd_connector_helper_funcs = {
 147         .get_modes = imx_pd_connector_get_modes,
 148         .best_encoder = imx_pd_connector_best_encoder,
 149         .mode_valid = imx_pd_connector_mode_valid,
 150 };
 151
 152 static struct drm_encoder_funcs imx_pd_encoder_funcs = {
 153         .destroy = imx_pd_encoder_destroy,
 154 };
 155
 156 static struct drm_encoder_helper_funcs imx_pd_encoder_helper_funcs = {
 157         .dpms = imx_pd_encoder_dpms,
 158         .mode_fixup = imx_pd_encoder_mode_fixup,
 159         .prepare = imx_pd_encoder_prepare,
 160         .commit = imx_pd_encoder_commit,
 161         .mode_set = imx_pd_encoder_mode_set,
 162         .disable = imx_pd_encoder_disable,
 163 };
 164
 165 static int imx_pd_register(struct imx_parallel_display *imxpd)
 166 {
 167         int ret;
 168
 169         drm_mode_connector_attach_encoder(&imxpd->connector, &imxpd->encoder);
 170
 171         imxpd->connector.funcs = &imx_pd_connector_funcs;
 172         imxpd->encoder.funcs = &imx_pd_encoder_funcs;
 173
 174         imxpd->encoder.encoder_type = DRM_MODE_ENCODER_NONE;
 175         imxpd->connector.connector_type = DRM_MODE_CONNECTOR_VGA;
 176
 177         drm_encoder_helper_add(&imxpd->encoder, &imx_pd_encoder_helper_funcs);
 178         ret = imx_drm_add_encoder(&imxpd->encoder, &imxpd->imx_drm_encoder,
 179                         THIS_MODULE);
 180         if (ret) {
 181                 dev_err(imxpd->dev, "adding encoder failed with %d\n", ret);
 182                 return ret;
 183         }
 184
 185         drm_connector_helper_add(&imxpd->connector,
 186                         &imx_pd_connector_helper_funcs);
 187
 188         ret = imx_drm_add_connector(&imxpd->connector,
 189                         &imxpd->imx_drm_connector, THIS_MODULE);
 190         if (ret) {
 191                 imx_drm_remove_encoder(imxpd->imx_drm_encoder);
 192                 dev_err(imxpd->dev, "adding connector failed with %d\n", ret);
 193                 return ret;
 194         }
 195
 196         imxpd->connector.encoder = &imxpd->encoder;
 197
 198         return 0;
 199 }
 200
 201 static int imx_pd_probe(struct platform_device *pdev)
 202 {
 203         struct device_node *np = pdev->dev.of_node;
 204         const u8 *edidp;
 205         struct imx_parallel_display *imxpd;
 206         int ret;
 207         const char *fmt;
 208
 209         imxpd = devm_kzalloc(&pdev->dev, sizeof(*imxpd), GFP_KERNEL);
 210         if (!imxpd)
 211                 return -ENOMEM;
 212
 213         edidp = of_get_property(np, "edid", &imxpd->edid_len);
 214         if (edidp)
 215                 imxpd->edid = kmemdup(edidp, imxpd->edid_len, GFP_KERNEL);
 216
 217         ret = of_property_read_string(np, "interface-pix-fmt", &fmt);
 218         if (!ret) {
 219                 if (!strcmp(fmt, "rgb24"))
 220                         imxpd->interface_pix_fmt = V4L2_PIX_FMT_RGB24;
 221                 else if (!strcmp(fmt, "rgb565"))
 222                         imxpd->interface_pix_fmt = V4L2_PIX_FMT_RGB565;
 223                 else if (!strcmp(fmt, "bgr666"))
 224                         imxpd->interface_pix_fmt = V4L2_PIX_FMT_BGR666;
 225         }
 226
 227         imxpd->dev = &pdev->dev;
 228
 229         ret = imx_pd_register(imxpd);
 230         if (ret)
 231                 return ret;
 232
 233         ret = imx_drm_encoder_add_possible_crtcs(imxpd->imx_drm_encoder, np);
 234
 235         platform_set_drvdata(pdev, imxpd);
 236
 237         return 0;
 238 }
 239
 240 static int imx_pd_remove(struct platform_device *pdev)
 241 {
 242         struct imx_parallel_display *imxpd = platform_get_drvdata(pdev);
 243         struct drm_connector *connector = &imxpd->connector;
 244         struct drm_encoder *encoder = &imxpd->encoder;
 245
 246         drm_mode_connector_detach_encoder(connector, encoder);
 247
 248         imx_drm_remove_connector(imxpd->imx_drm_connector);
 249         imx_drm_remove_encoder(imxpd->imx_drm_encoder);
 250
 251         return 0;
 252 }
 253
 254 static const struct of_device_id imx_pd_dt_ids[] = {
 255         { .compatible = "fsl,imx-parallel-display", },
 256         { /* sentinel */ }
 257 };
 258 MODULE_DEVICE_TABLE(of, imx_pd_dt_ids);
 259
 260 static struct platform_driver imx_pd_driver = {
 261         .probe          = imx_pd_probe,
 262         .remove         = imx_pd_remove,
 263         .driver         = {
 264                 .of_match_table = imx_pd_dt_ids,
 265                 .name   = "imx-parallel-display",
 266                 .owner  = THIS_MODULE,
 267         },
 268 };
 269
 270 module_platform_driver(imx_pd_driver);
 271
 272 MODULE_DESCRIPTION("i.MX parallel display driver");
 273 MODULE_AUTHOR("Sascha Hauer, Pengutronix");
 274 MODULE_LICENSE("GPL");
 275 MODULE_ALIAS("platform:imx-parallel-display");