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 <linux/pinctrl/consumer.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         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         return num_modes;
  76 }
  77
  78 static int imx_pd_connector_mode_valid(struct drm_connector *connector,
  79                           struct drm_display_mode *mode)
  80 {
  81         return 0;
  82 }
  83
  84 static struct drm_encoder *imx_pd_connector_best_encoder(
  85                 struct drm_connector *connector)
  86 {
  87         struct imx_parallel_display *imxpd = con_to_imxpd(connector);
  88
  89         return &imxpd->encoder;
  90 }
  91
  92 static void imx_pd_encoder_dpms(struct drm_encoder *encoder, int mode)
  93 {
  94 }
  95
  96 static bool imx_pd_encoder_mode_fixup(struct drm_encoder *encoder,
  97                            const struct drm_display_mode *mode,
  98                            struct drm_display_mode *adjusted_mode)
  99 {
 100         return true;
 101 }
 102
 103 static void imx_pd_encoder_prepare(struct drm_encoder *encoder)
 104 {
 105         struct imx_parallel_display *imxpd = enc_to_imxpd(encoder);
 106
 107         imx_drm_crtc_panel_format(encoder->crtc, DRM_MODE_ENCODER_NONE,
 108                         imxpd->interface_pix_fmt);
 109 }
 110
 111 static void imx_pd_encoder_commit(struct drm_encoder *encoder)
 112 {
 113 }
 114
 115 static void imx_pd_encoder_mode_set(struct drm_encoder *encoder,
 116                          struct drm_display_mode *mode,
 117                          struct drm_display_mode *adjusted_mode)
 118 {
 119 }
 120
 121 static void imx_pd_encoder_disable(struct drm_encoder *encoder)
 122 {
 123 }
 124
 125 static void imx_pd_encoder_destroy(struct drm_encoder *encoder)
 126 {
 127         /* do not free here */
 128 }
 129
 130 static struct drm_connector_funcs imx_pd_connector_funcs = {
 131         .dpms = drm_helper_connector_dpms,
 132         .fill_modes = drm_helper_probe_single_connector_modes,
 133         .detect = imx_pd_connector_detect,
 134         .destroy = imx_pd_connector_destroy,
 135 };
 136
 137 static struct drm_connector_helper_funcs imx_pd_connector_helper_funcs = {
 138         .get_modes = imx_pd_connector_get_modes,
 139         .best_encoder = imx_pd_connector_best_encoder,
 140         .mode_valid = imx_pd_connector_mode_valid,
 141 };
 142
 143 static struct drm_encoder_funcs imx_pd_encoder_funcs = {
 144         .destroy = imx_pd_encoder_destroy,
 145 };
 146
 147 static struct drm_encoder_helper_funcs imx_pd_encoder_helper_funcs = {
 148         .dpms = imx_pd_encoder_dpms,
 149         .mode_fixup = imx_pd_encoder_mode_fixup,
 150         .prepare = imx_pd_encoder_prepare,
 151         .commit = imx_pd_encoder_commit,
 152         .mode_set = imx_pd_encoder_mode_set,
 153         .disable = imx_pd_encoder_disable,
 154 };
 155
 156 static int imx_pd_register(struct imx_parallel_display *imxpd)
 157 {
 158         int ret;
 159
 160         drm_mode_connector_attach_encoder(&imxpd->connector, &imxpd->encoder);
 161
 162         imxpd->connector.funcs = &imx_pd_connector_funcs;
 163         imxpd->encoder.funcs = &imx_pd_encoder_funcs;
 164
 165         imxpd->encoder.encoder_type = DRM_MODE_ENCODER_NONE;
 166         imxpd->connector.connector_type = DRM_MODE_CONNECTOR_VGA;
 167
 168         drm_encoder_helper_add(&imxpd->encoder, &imx_pd_encoder_helper_funcs);
 169         ret = imx_drm_add_encoder(&imxpd->encoder, &imxpd->imx_drm_encoder,
 170                         THIS_MODULE);
 171         if (ret) {
 172                 dev_err(imxpd->dev, "adding encoder failed with %d\n", ret);
 173                 return ret;
 174         }
 175
 176         drm_connector_helper_add(&imxpd->connector,
 177                         &imx_pd_connector_helper_funcs);
 178
 179         ret = imx_drm_add_connector(&imxpd->connector,
 180                         &imxpd->imx_drm_connector, THIS_MODULE);
 181         if (ret) {
 182                 imx_drm_remove_encoder(imxpd->imx_drm_encoder);
 183                 dev_err(imxpd->dev, "adding connector failed with %d\n", ret);
 184                 return ret;
 185         }
 186
 187         imxpd->connector.encoder = &imxpd->encoder;
 188
 189         return 0;
 190 }
 191
 192 static int __devinit imx_pd_probe(struct platform_device *pdev)
 193 {
 194         struct device_node *np = pdev->dev.of_node;
 195         const u8 *edidp;
 196         struct imx_parallel_display *imxpd;
 197         int ret;
 198         const char *fmt;
 199         struct pinctrl *pinctrl;
 200
 201         imxpd = devm_kzalloc(&pdev->dev, sizeof(*imxpd), GFP_KERNEL);
 202         if (!imxpd)
 203                 return -ENOMEM;
 204
 205         pinctrl = devm_pinctrl_get_select_default(&pdev->dev);
 206         if (IS_ERR(pinctrl)) {
 207                 ret = PTR_ERR(pinctrl);
 208                 dev_warn(&pdev->dev, "pinctrl_get_select_default failed with %d",
 209                                 ret);
 210                 return ret;
 211         }
 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         }
 224
 225         imxpd->dev = &pdev->dev;
 226
 227         ret = imx_pd_register(imxpd);
 228         if (ret)
 229                 return ret;
 230
 231         ret = imx_drm_encoder_add_possible_crtcs(imxpd->imx_drm_encoder, np);
 232
 233         platform_set_drvdata(pdev, imxpd);
 234
 235         return 0;
 236 }
 237
 238 static int __devexit imx_pd_remove(struct platform_device *pdev)
 239 {
 240         struct imx_parallel_display *imxpd = platform_get_drvdata(pdev);
 241         struct drm_connector *connector = &imxpd->connector;
 242         struct drm_encoder *encoder = &imxpd->encoder;
 243
 244         drm_mode_connector_detach_encoder(connector, encoder);
 245
 246         imx_drm_remove_connector(imxpd->imx_drm_connector);
 247         imx_drm_remove_encoder(imxpd->imx_drm_encoder);
 248
 249         return 0;
 250 }
 251
 252 static const struct of_device_id imx_pd_dt_ids[] = {
 253         { .compatible = "fsl,imx-parallel-display", },
 254         { /* sentinel */ }
 255 };
 256
 257 static struct platform_driver imx_pd_driver = {
 258         .probe          = imx_pd_probe,
 259         .remove         = __devexit_p(imx_pd_remove),
 260         .driver         = {
 261                 .of_match_table = imx_pd_dt_ids,
 262                 .name   = "imx-parallel-display",
 263                 .owner  = THIS_MODULE,
 264         },
 265 };
 266
 267 module_platform_driver(imx_pd_driver);
 268
 269 MODULE_DESCRIPTION("i.MX parallel display driver");
 270 MODULE_AUTHOR("Sascha Hauer, Pengutronix");
 271 MODULE_LICENSE("GPL");