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/component.h>
  22 #include <linux/module.h>
  23 #include <drm/drmP.h>
  24 #include <drm/drm_fb_helper.h>
  25 #include <drm/drm_crtc_helper.h>
  26 #include <drm/drm_panel.h>
  27 #include <linux/videodev2.h>
  28 #include <video/of_display_timing.h>
  29
  30 #include "imx-drm.h"
  31
  32 #define con_to_imxpd(x) container_of(x, struct imx_parallel_display, connector)
  33 #define enc_to_imxpd(x) container_of(x, struct imx_parallel_display, encoder)
  34
  35 struct imx_parallel_display {
  36         struct drm_connector connector;
  37         struct drm_encoder 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         struct drm_panel *panel;
  45 };
  46
  47 static enum drm_connector_status imx_pd_connector_detect(
  48                 struct drm_connector *connector, bool force)
  49 {
  50         return connector_status_connected;
  51 }
  52
  53 static int imx_pd_connector_get_modes(struct drm_connector *connector)
  54 {
  55         struct imx_parallel_display *imxpd = con_to_imxpd(connector);
  56         struct device_node *np = imxpd->dev->of_node;
  57         int num_modes = 0;
  58
  59         if (imxpd->panel && imxpd->panel->funcs &&
  60             imxpd->panel->funcs->get_modes) {
  61                 num_modes = imxpd->panel->funcs->get_modes(imxpd->panel);
  62                 if (num_modes > 0)
  63                         return num_modes;
  64         }
  65
  66         if (imxpd->edid) {
  67                 drm_mode_connector_update_edid_property(connector, imxpd->edid);
  68                 num_modes = drm_add_edid_modes(connector, imxpd->edid);
  69         }
  70
  71         if (imxpd->mode_valid) {
  72                 struct drm_display_mode *mode = drm_mode_create(connector->dev);
  73                 if (!mode)
  74                         return -EINVAL;
  75                 drm_mode_copy(mode, &imxpd->mode);
  76                 mode->type |= DRM_MODE_TYPE_DRIVER | DRM_MODE_TYPE_PREFERRED,
  77                 drm_mode_probed_add(connector, mode);
  78                 num_modes++;
  79         }
  80
  81         if (np) {
  82                 struct drm_display_mode *mode = drm_mode_create(connector->dev);
  83                 if (!mode)
  84                         return -EINVAL;
  85                 of_get_drm_display_mode(np, &imxpd->mode, OF_USE_NATIVE_MODE);
  86                 drm_mode_copy(mode, &imxpd->mode);
  87                 mode->type |= DRM_MODE_TYPE_DRIVER | DRM_MODE_TYPE_PREFERRED,
  88                 drm_mode_probed_add(connector, mode);
  89                 num_modes++;
  90         }
  91
  92         return num_modes;
  93 }
  94
  95 static struct drm_encoder *imx_pd_connector_best_encoder(
  96                 struct drm_connector *connector)
  97 {
  98         struct imx_parallel_display *imxpd = con_to_imxpd(connector);
  99
 100         return &imxpd->encoder;
 101 }
 102
 103 static void imx_pd_encoder_dpms(struct drm_encoder *encoder, int mode)
 104 {
 105         struct imx_parallel_display *imxpd = enc_to_imxpd(encoder);
 106
 107         if (mode != DRM_MODE_DPMS_ON)
 108                 drm_panel_disable(imxpd->panel);
 109         else
 110                 drm_panel_enable(imxpd->panel);
 111 }
 112
 113 static bool imx_pd_encoder_mode_fixup(struct drm_encoder *encoder,
 114                            const struct drm_display_mode *mode,
 115                            struct drm_display_mode *adjusted_mode)
 116 {
 117         return true;
 118 }
 119
 120 static void imx_pd_encoder_prepare(struct drm_encoder *encoder)
 121 {
 122         struct imx_parallel_display *imxpd = enc_to_imxpd(encoder);
 123
 124         imx_drm_panel_format(encoder, imxpd->interface_pix_fmt);
 125 }
 126
 127 static void imx_pd_encoder_commit(struct drm_encoder *encoder)
 128 {
 129 }
 130
 131 static void imx_pd_encoder_mode_set(struct drm_encoder *encoder,
 132                          struct drm_display_mode *mode,
 133                          struct drm_display_mode *adjusted_mode)
 134 {
 135 }
 136
 137 static void imx_pd_encoder_disable(struct drm_encoder *encoder)
 138 {
 139 }
 140
 141 static struct drm_connector_funcs imx_pd_connector_funcs = {
 142         .dpms = drm_helper_connector_dpms,
 143         .fill_modes = drm_helper_probe_single_connector_modes,
 144         .detect = imx_pd_connector_detect,
 145         .destroy = imx_drm_connector_destroy,
 146 };
 147
 148 static struct drm_connector_helper_funcs imx_pd_connector_helper_funcs = {
 149         .get_modes = imx_pd_connector_get_modes,
 150         .best_encoder = imx_pd_connector_best_encoder,
 151 };
 152
 153 static struct drm_encoder_funcs imx_pd_encoder_funcs = {
 154         .destroy = imx_drm_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 drm_device *drm,
 167         struct imx_parallel_display *imxpd)
 168 {
 169         int ret;
 170
 171         ret = imx_drm_encoder_parse_of(drm, &imxpd->encoder,
 172                                        imxpd->dev->of_node);
 173         if (ret)
 174                 return ret;
 175
 176         /* set the connector's dpms to OFF so that
 177          * drm_helper_connector_dpms() won't return
 178          * immediately since the current state is ON
 179          * at this point.
 180          */
 181         imxpd->connector.dpms = DRM_MODE_DPMS_OFF;
 182
 183         drm_encoder_helper_add(&imxpd->encoder, &imx_pd_encoder_helper_funcs);
 184         drm_encoder_init(drm, &imxpd->encoder, &imx_pd_encoder_funcs,
 185                          DRM_MODE_ENCODER_NONE);
 186
 187         drm_connector_helper_add(&imxpd->connector,
 188                         &imx_pd_connector_helper_funcs);
 189         drm_connector_init(drm, &imxpd->connector, &imx_pd_connector_funcs,
 190                            DRM_MODE_CONNECTOR_VGA);
 191
 192         if (imxpd->panel)
 193                 drm_panel_attach(imxpd->panel, &imxpd->connector);
 194
 195         drm_mode_connector_attach_encoder(&imxpd->connector, &imxpd->encoder);
 196
 197         imxpd->connector.encoder = &imxpd->encoder;
 198
 199         return 0;
 200 }
 201
 202 static int imx_pd_bind(struct device *dev, struct device *master, void *data)
 203 {
 204         struct drm_device *drm = data;
 205         struct device_node *np = dev->of_node;
 206         struct device_node *panel_node;
 207         const u8 *edidp;
 208         struct imx_parallel_display *imxpd;
 209         int ret;
 210         const char *fmt;
 211
 212         imxpd = devm_kzalloc(dev, sizeof(*imxpd), GFP_KERNEL);
 213         if (!imxpd)
 214                 return -ENOMEM;
 215
 216         edidp = of_get_property(np, "edid", &imxpd->edid_len);
 217         if (edidp)
 218                 imxpd->edid = kmemdup(edidp, imxpd->edid_len, GFP_KERNEL);
 219
 220         ret = of_property_read_string(np, "interface-pix-fmt", &fmt);
 221         if (!ret) {
 222                 if (!strcmp(fmt, "rgb24"))
 223                         imxpd->interface_pix_fmt = V4L2_PIX_FMT_RGB24;
 224                 else if (!strcmp(fmt, "rgb565"))
 225                         imxpd->interface_pix_fmt = V4L2_PIX_FMT_RGB565;
 226                 else if (!strcmp(fmt, "bgr666"))
 227                         imxpd->interface_pix_fmt = V4L2_PIX_FMT_BGR666;
 228                 else if (!strcmp(fmt, "lvds666"))
 229                         imxpd->interface_pix_fmt = v4l2_fourcc('L', 'V', 'D', '6');
 230         }
 231
 232         panel_node = of_parse_phandle(np, "fsl,panel", 0);
 233         if (panel_node)
 234                 imxpd->panel = of_drm_find_panel(panel_node);
 235
 236         imxpd->dev = dev;
 237
 238         ret = imx_pd_register(drm, imxpd);
 239         if (ret)
 240                 return ret;
 241
 242         dev_set_drvdata(dev, imxpd);
 243
 244         return 0;
 245 }
 246
 247 static void imx_pd_unbind(struct device *dev, struct device *master,
 248         void *data)
 249 {
 250         struct imx_parallel_display *imxpd = dev_get_drvdata(dev);
 251
 252         imxpd->encoder.funcs->destroy(&imxpd->encoder);
 253         imxpd->connector.funcs->destroy(&imxpd->connector);
 254 }
 255
 256 static const struct component_ops imx_pd_ops = {
 257         .bind   = imx_pd_bind,
 258         .unbind = imx_pd_unbind,
 259 };
 260
 261 static int imx_pd_probe(struct platform_device *pdev)
 262 {
 263         return component_add(&pdev->dev, &imx_pd_ops);
 264 }
 265
 266 static int imx_pd_remove(struct platform_device *pdev)
 267 {
 268         component_del(&pdev->dev, &imx_pd_ops);
 269         return 0;
 270 }
 271
 272 static const struct of_device_id imx_pd_dt_ids[] = {
 273         { .compatible = "fsl,imx-parallel-display", },
 274         { /* sentinel */ }
 275 };
 276 MODULE_DEVICE_TABLE(of, imx_pd_dt_ids);
 277
 278 static struct platform_driver imx_pd_driver = {
 279         .probe          = imx_pd_probe,
 280         .remove         = imx_pd_remove,
 281         .driver         = {
 282                 .of_match_table = imx_pd_dt_ids,
 283                 .name   = "imx-parallel-display",
 284                 .owner  = THIS_MODULE,
 285         },
 286 };
 287
 288 module_platform_driver(imx_pd_driver);
 289
 290 MODULE_DESCRIPTION("i.MX parallel display driver");
 291 MODULE_AUTHOR("Sascha Hauer, Pengutronix");
 292 MODULE_LICENSE("GPL");
 293 MODULE_ALIAS("platform:imx-parallel-display");