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