drivers/video/omap2/displays-new/encoder-tfp410.c

   1 /*
   2  * TFP410 DPI-to-DVI encoder driver
   3  *
   4  * Copyright (C) 2013 Texas Instruments
   5  * Author: Tomi Valkeinen <tomi.valkeinen@ti.com>
   6  *
   7  * This program is free software; you can redistribute it and/or modify it
   8  * under the terms of the GNU General Public License version 2 as published by
   9  * the Free Software Foundation.
  10  */
  11
  12 #include <linux/gpio.h>
  13 #include <linux/module.h>
  14 #include <linux/platform_device.h>
  15 #include <linux/slab.h>
  16
  17 #include <video/omapdss.h>
  18 #include <video/omap-panel-data.h>
  19
  20 struct panel_drv_data {
  21         struct omap_dss_device dssdev;
  22         struct omap_dss_device *in;
  23
  24         int pd_gpio;
  25         int data_lines;
  26
  27         struct omap_video_timings timings;
  28 };
  29
  30 #define to_panel_data(x) container_of(x, struct panel_drv_data, dssdev)
  31
  32 static int tfp410_connect(struct omap_dss_device *dssdev,
  33                 struct omap_dss_device *dst)
  34 {
  35         struct panel_drv_data *ddata = to_panel_data(dssdev);
  36         struct omap_dss_device *in = ddata->in;
  37         int r;
  38
  39         if (omapdss_device_is_connected(dssdev))
  40                 return -EBUSY;
  41
  42         r = in->ops.dpi->connect(in, dssdev);
  43         if (r)
  44                 return r;
  45
  46         dst->src = dssdev;
  47         dssdev->dst = dst;
  48
  49         return 0;
  50 }
  51
  52 static void tfp410_disconnect(struct omap_dss_device *dssdev,
  53                 struct omap_dss_device *dst)
  54 {
  55         struct panel_drv_data *ddata = to_panel_data(dssdev);
  56         struct omap_dss_device *in = ddata->in;
  57
  58         WARN_ON(!omapdss_device_is_connected(dssdev));
  59         if (!omapdss_device_is_connected(dssdev))
  60                 return;
  61
  62         WARN_ON(dst != dssdev->dst);
  63         if (dst != dssdev->dst)
  64                 return;
  65
  66         dst->src = NULL;
  67         dssdev->dst = NULL;
  68
  69         in->ops.dpi->disconnect(in, &ddata->dssdev);
  70 }
  71
  72 static int tfp410_enable(struct omap_dss_device *dssdev)
  73 {
  74         struct panel_drv_data *ddata = to_panel_data(dssdev);
  75         struct omap_dss_device *in = ddata->in;
  76         int r;
  77
  78         if (!omapdss_device_is_connected(dssdev))
  79                 return -ENODEV;
  80
  81         if (omapdss_device_is_enabled(dssdev))
  82                 return 0;
  83
  84         in->ops.dpi->set_timings(in, &ddata->timings);
  85         in->ops.dpi->set_data_lines(in, ddata->data_lines);
  86
  87         r = in->ops.dpi->enable(in);
  88         if (r)
  89                 return r;
  90
  91         if (gpio_is_valid(ddata->pd_gpio))
  92                 gpio_set_value_cansleep(ddata->pd_gpio, 1);
  93
  94         dssdev->state = OMAP_DSS_DISPLAY_ACTIVE;
  95
  96         return 0;
  97 }
  98
  99 static void tfp410_disable(struct omap_dss_device *dssdev)
 100 {
 101         struct panel_drv_data *ddata = to_panel_data(dssdev);
 102         struct omap_dss_device *in = ddata->in;
 103
 104         if (!omapdss_device_is_enabled(dssdev))
 105                 return;
 106
 107         if (gpio_is_valid(ddata->pd_gpio))
 108                 gpio_set_value_cansleep(ddata->pd_gpio, 0);
 109
 110         in->ops.dpi->disable(in);
 111
 112         dssdev->state = OMAP_DSS_DISPLAY_DISABLED;
 113 }
 114
 115 static void tfp410_set_timings(struct omap_dss_device *dssdev,
 116                 struct omap_video_timings *timings)
 117 {
 118         struct panel_drv_data *ddata = to_panel_data(dssdev);
 119         struct omap_dss_device *in = ddata->in;
 120
 121         ddata->timings = *timings;
 122         dssdev->panel.timings = *timings;
 123
 124         in->ops.dpi->set_timings(in, timings);
 125 }
 126
 127 static void tfp410_get_timings(struct omap_dss_device *dssdev,
 128                 struct omap_video_timings *timings)
 129 {
 130         struct panel_drv_data *ddata = to_panel_data(dssdev);
 131
 132         *timings = ddata->timings;
 133 }
 134
 135 static int tfp410_check_timings(struct omap_dss_device *dssdev,
 136                 struct omap_video_timings *timings)
 137 {
 138         struct panel_drv_data *ddata = to_panel_data(dssdev);
 139         struct omap_dss_device *in = ddata->in;
 140
 141         return in->ops.dpi->check_timings(in, timings);
 142 }
 143
 144 static const struct omapdss_dvi_ops tfp410_dvi_ops = {
 145         .connect        = tfp410_connect,
 146         .disconnect     = tfp410_disconnect,
 147
 148         .enable         = tfp410_enable,
 149         .disable        = tfp410_disable,
 150
 151         .check_timings  = tfp410_check_timings,
 152         .set_timings    = tfp410_set_timings,
 153         .get_timings    = tfp410_get_timings,
 154 };
 155
 156 static int tfp410_probe_pdata(struct platform_device *pdev)
 157 {
 158         struct panel_drv_data *ddata = platform_get_drvdata(pdev);
 159         struct encoder_tfp410_platform_data *pdata;
 160         struct omap_dss_device *dssdev, *in;
 161
 162         pdata = dev_get_platdata(&pdev->dev);
 163
 164         ddata->pd_gpio = pdata->power_down_gpio;
 165
 166         ddata->data_lines = pdata->data_lines;
 167
 168         in = omap_dss_find_output(pdata->source);
 169         if (in == NULL) {
 170                 dev_err(&pdev->dev, "Failed to find video source\n");
 171                 return -ENODEV;
 172         }
 173
 174         ddata->in = in;
 175
 176         dssdev = &ddata->dssdev;
 177         dssdev->name = pdata->name;
 178
 179         return 0;
 180 }
 181
 182 static int tfp410_probe(struct platform_device *pdev)
 183 {
 184         struct panel_drv_data *ddata;
 185         struct omap_dss_device *dssdev;
 186         int r;
 187
 188         ddata = devm_kzalloc(&pdev->dev, sizeof(*ddata), GFP_KERNEL);
 189         if (!ddata)
 190                 return -ENOMEM;
 191
 192         platform_set_drvdata(pdev, ddata);
 193
 194         if (dev_get_platdata(&pdev->dev)) {
 195                 r = tfp410_probe_pdata(pdev);
 196                 if (r)
 197                         return r;
 198         } else {
 199                 return -ENODEV;
 200         }
 201
 202         if (gpio_is_valid(ddata->pd_gpio)) {
 203                 r = devm_gpio_request_one(&pdev->dev, ddata->pd_gpio,
 204                                 GPIOF_OUT_INIT_LOW, "tfp410 PD");
 205                 if (r) {
 206                         dev_err(&pdev->dev, "Failed to request PD GPIO %d\n",
 207                                         ddata->pd_gpio);
 208                         goto err_gpio;
 209                 }
 210         }
 211
 212         dssdev = &ddata->dssdev;
 213         dssdev->ops.dvi = &tfp410_dvi_ops;
 214         dssdev->dev = &pdev->dev;
 215         dssdev->type = OMAP_DISPLAY_TYPE_DPI;
 216         dssdev->output_type = OMAP_DISPLAY_TYPE_DVI;
 217         dssdev->owner = THIS_MODULE;
 218         dssdev->phy.dpi.data_lines = ddata->data_lines;
 219
 220         r = omapdss_register_output(dssdev);
 221         if (r) {
 222                 dev_err(&pdev->dev, "Failed to register output\n");
 223                 goto err_reg;
 224         }
 225
 226         return 0;
 227 err_reg:
 228 err_gpio:
 229         omap_dss_put_device(ddata->in);
 230         return r;
 231 }
 232
 233 static int __exit tfp410_remove(struct platform_device *pdev)
 234 {
 235         struct panel_drv_data *ddata = platform_get_drvdata(pdev);
 236         struct omap_dss_device *dssdev = &ddata->dssdev;
 237         struct omap_dss_device *in = ddata->in;
 238
 239         omapdss_unregister_output(&ddata->dssdev);
 240
 241         WARN_ON(omapdss_device_is_enabled(dssdev));
 242         if (omapdss_device_is_enabled(dssdev))
 243                 tfp410_disable(dssdev);
 244
 245         WARN_ON(omapdss_device_is_connected(dssdev));
 246         if (omapdss_device_is_connected(dssdev))
 247                 tfp410_disconnect(dssdev, dssdev->dst);
 248
 249         omap_dss_put_device(in);
 250
 251         return 0;
 252 }
 253
 254 static struct platform_driver tfp410_driver = {
 255         .probe  = tfp410_probe,
 256         .remove = __exit_p(tfp410_remove),
 257         .driver = {
 258                 .name   = "tfp410",
 259                 .owner  = THIS_MODULE,
 260         },
 261 };
 262
 263 module_platform_driver(tfp410_driver);
 264
 265 MODULE_AUTHOR("Tomi Valkeinen <tomi.valkeinen@ti.com>");
 266 MODULE_DESCRIPTION("TFP410 DPI to DVI encoder driver");
 267 MODULE_LICENSE("GPL");