drivers/gpu/drm/omapdrm/displays/encoder-tfp410.c

   1 /*
   2  * TFP410 DPI-to-DVI encoder driver
   3  *
   4  * Copyright (C) 2013 Texas Instruments Incorporated - http://www.ti.com/
   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/consumer.h>
  13 #include <linux/module.h>
  14 #include <linux/platform_device.h>
  15 #include <linux/slab.h>
  16 #include <linux/of_gpio.h>
  17
  18 #include "../dss/omapdss.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
  26         struct videomode vm;
  27 };
  28
  29 #define to_panel_data(x) container_of(x, struct panel_drv_data, dssdev)
  30
  31 static int tfp410_connect(struct omap_dss_device *dssdev,
  32                 struct omap_dss_device *dst)
  33 {
  34         struct panel_drv_data *ddata = to_panel_data(dssdev);
  35         struct omap_dss_device *in;
  36         int r;
  37
  38         if (omapdss_device_is_connected(dssdev))
  39                 return -EBUSY;
  40
  41         in = omapdss_of_find_source_for_first_ep(dssdev->dev->of_node);
  42         if (IS_ERR(in)) {
  43                 dev_err(dssdev->dev, "failed to find video source\n");
  44                 return PTR_ERR(in);
  45         }
  46
  47         r = in->ops.dpi->connect(in, dssdev);
  48         if (r) {
  49                 omap_dss_put_device(in);
  50                 return r;
  51         }
  52
  53         dst->src = dssdev;
  54         dssdev->dst = dst;
  55
  56         ddata->in = in;
  57         return 0;
  58 }
  59
  60 static void tfp410_disconnect(struct omap_dss_device *dssdev,
  61                 struct omap_dss_device *dst)
  62 {
  63         struct panel_drv_data *ddata = to_panel_data(dssdev);
  64         struct omap_dss_device *in = ddata->in;
  65
  66         WARN_ON(!omapdss_device_is_connected(dssdev));
  67         if (!omapdss_device_is_connected(dssdev))
  68                 return;
  69
  70         WARN_ON(dst != dssdev->dst);
  71         if (dst != dssdev->dst)
  72                 return;
  73
  74         dst->src = NULL;
  75         dssdev->dst = NULL;
  76
  77         in->ops.dpi->disconnect(in, &ddata->dssdev);
  78
  79         omap_dss_put_device(in);
  80         ddata->in = NULL;
  81 }
  82
  83 static int tfp410_enable(struct omap_dss_device *dssdev)
  84 {
  85         struct panel_drv_data *ddata = to_panel_data(dssdev);
  86         struct omap_dss_device *in = ddata->in;
  87         int r;
  88
  89         if (!omapdss_device_is_connected(dssdev))
  90                 return -ENODEV;
  91
  92         if (omapdss_device_is_enabled(dssdev))
  93                 return 0;
  94
  95         in->ops.dpi->set_timings(in, &ddata->vm);
  96
  97         r = in->ops.dpi->enable(in);
  98         if (r)
  99                 return r;
 100
 101         if (gpio_is_valid(ddata->pd_gpio))
 102                 gpio_set_value_cansleep(ddata->pd_gpio, 1);
 103
 104         dssdev->state = OMAP_DSS_DISPLAY_ACTIVE;
 105
 106         return 0;
 107 }
 108
 109 static void tfp410_disable(struct omap_dss_device *dssdev)
 110 {
 111         struct panel_drv_data *ddata = to_panel_data(dssdev);
 112         struct omap_dss_device *in = ddata->in;
 113
 114         if (!omapdss_device_is_enabled(dssdev))
 115                 return;
 116
 117         if (gpio_is_valid(ddata->pd_gpio))
 118                 gpio_set_value_cansleep(ddata->pd_gpio, 0);
 119
 120         in->ops.dpi->disable(in);
 121
 122         dssdev->state = OMAP_DSS_DISPLAY_DISABLED;
 123 }
 124
 125 static void tfp410_fix_timings(struct videomode *vm)
 126 {
 127         vm->flags |= DISPLAY_FLAGS_DE_HIGH | DISPLAY_FLAGS_PIXDATA_POSEDGE |
 128                      DISPLAY_FLAGS_SYNC_POSEDGE;
 129 }
 130
 131 static void tfp410_set_timings(struct omap_dss_device *dssdev,
 132                                struct videomode *vm)
 133 {
 134         struct panel_drv_data *ddata = to_panel_data(dssdev);
 135         struct omap_dss_device *in = ddata->in;
 136
 137         tfp410_fix_timings(vm);
 138
 139         ddata->vm = *vm;
 140         dssdev->panel.vm = *vm;
 141
 142         in->ops.dpi->set_timings(in, vm);
 143 }
 144
 145 static void tfp410_get_timings(struct omap_dss_device *dssdev,
 146                                struct videomode *vm)
 147 {
 148         struct panel_drv_data *ddata = to_panel_data(dssdev);
 149
 150         *vm = ddata->vm;
 151 }
 152
 153 static int tfp410_check_timings(struct omap_dss_device *dssdev,
 154                                 struct videomode *vm)
 155 {
 156         struct panel_drv_data *ddata = to_panel_data(dssdev);
 157         struct omap_dss_device *in = ddata->in;
 158
 159         tfp410_fix_timings(vm);
 160
 161         return in->ops.dpi->check_timings(in, vm);
 162 }
 163
 164 static const struct omapdss_dvi_ops tfp410_dvi_ops = {
 165         .connect        = tfp410_connect,
 166         .disconnect     = tfp410_disconnect,
 167
 168         .enable         = tfp410_enable,
 169         .disable        = tfp410_disable,
 170
 171         .check_timings  = tfp410_check_timings,
 172         .set_timings    = tfp410_set_timings,
 173         .get_timings    = tfp410_get_timings,
 174 };
 175
 176 static int tfp410_probe_of(struct platform_device *pdev)
 177 {
 178         struct panel_drv_data *ddata = platform_get_drvdata(pdev);
 179         struct device_node *node = pdev->dev.of_node;
 180         int gpio;
 181
 182         gpio = of_get_named_gpio(node, "powerdown-gpios", 0);
 183
 184         if (gpio_is_valid(gpio) || gpio == -ENOENT) {
 185                 ddata->pd_gpio = gpio;
 186         } else {
 187                 if (gpio != -EPROBE_DEFER)
 188                         dev_err(&pdev->dev, "failed to parse PD gpio\n");
 189                 return gpio;
 190         }
 191
 192         return 0;
 193 }
 194
 195 static int tfp410_probe(struct platform_device *pdev)
 196 {
 197         struct panel_drv_data *ddata;
 198         struct omap_dss_device *dssdev;
 199         int r;
 200
 201         ddata = devm_kzalloc(&pdev->dev, sizeof(*ddata), GFP_KERNEL);
 202         if (!ddata)
 203                 return -ENOMEM;
 204
 205         platform_set_drvdata(pdev, ddata);
 206
 207         r = tfp410_probe_of(pdev);
 208         if (r)
 209                 return r;
 210
 211         if (gpio_is_valid(ddata->pd_gpio)) {
 212                 r = devm_gpio_request_one(&pdev->dev, ddata->pd_gpio,
 213                                 GPIOF_OUT_INIT_LOW, "tfp410 PD");
 214                 if (r) {
 215                         dev_err(&pdev->dev, "Failed to request PD GPIO %d\n",
 216                                         ddata->pd_gpio);
 217                         return r;
 218                 }
 219         }
 220
 221         dssdev = &ddata->dssdev;
 222         dssdev->ops.dvi = &tfp410_dvi_ops;
 223         dssdev->dev = &pdev->dev;
 224         dssdev->type = OMAP_DISPLAY_TYPE_DPI;
 225         dssdev->output_type = OMAP_DISPLAY_TYPE_DVI;
 226         dssdev->owner = THIS_MODULE;
 227         dssdev->port_num = 1;
 228
 229         r = omapdss_register_output(dssdev);
 230         if (r) {
 231                 dev_err(&pdev->dev, "Failed to register output\n");
 232                 return r;
 233         }
 234
 235         return 0;
 236 }
 237
 238 static int __exit tfp410_remove(struct platform_device *pdev)
 239 {
 240         struct panel_drv_data *ddata = platform_get_drvdata(pdev);
 241         struct omap_dss_device *dssdev = &ddata->dssdev;
 242
 243         omapdss_unregister_output(&ddata->dssdev);
 244
 245         WARN_ON(omapdss_device_is_enabled(dssdev));
 246         if (omapdss_device_is_enabled(dssdev))
 247                 tfp410_disable(dssdev);
 248
 249         WARN_ON(omapdss_device_is_connected(dssdev));
 250         if (omapdss_device_is_connected(dssdev))
 251                 tfp410_disconnect(dssdev, dssdev->dst);
 252
 253         return 0;
 254 }
 255
 256 static const struct of_device_id tfp410_of_match[] = {
 257         { .compatible = "omapdss,ti,tfp410", },
 258         {},
 259 };
 260
 261 MODULE_DEVICE_TABLE(of, tfp410_of_match);
 262
 263 static struct platform_driver tfp410_driver = {
 264         .probe  = tfp410_probe,
 265         .remove = __exit_p(tfp410_remove),
 266         .driver = {
 267                 .name   = "tfp410",
 268                 .of_match_table = tfp410_of_match,
 269                 .suppress_bind_attrs = true,
 270         },
 271 };
 272
 273 module_platform_driver(tfp410_driver);
 274
 275 MODULE_AUTHOR("Tomi Valkeinen <tomi.valkeinen@ti.com>");
 276 MODULE_DESCRIPTION("TFP410 DPI to DVI encoder driver");
 277 MODULE_LICENSE("GPL");