drivers/gpu/drm/omapdrm/displays/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 #include <linux/of_gpio.h>
  17
  18 #include <video/omapdss.h>
  19 #include <video/omap-panel-data.h>
  20
  21 struct panel_drv_data {
  22         struct omap_dss_device dssdev;
  23         struct omap_dss_device *in;
  24
  25         int pd_gpio;
  26         int data_lines;
  27
  28         struct omap_video_timings timings;
  29 };
  30
  31 #define to_panel_data(x) container_of(x, struct panel_drv_data, dssdev)
  32
  33 static int tfp410_connect(struct omap_dss_device *dssdev,
  34                 struct omap_dss_device *dst)
  35 {
  36         struct panel_drv_data *ddata = to_panel_data(dssdev);
  37         struct omap_dss_device *in = ddata->in;
  38         int r;
  39
  40         if (omapdss_device_is_connected(dssdev))
  41                 return -EBUSY;
  42
  43         r = in->ops.dpi->connect(in, dssdev);
  44         if (r)
  45                 return r;
  46
  47         dst->src = dssdev;
  48         dssdev->dst = dst;
  49
  50         return 0;
  51 }
  52
  53 static void tfp410_disconnect(struct omap_dss_device *dssdev,
  54                 struct omap_dss_device *dst)
  55 {
  56         struct panel_drv_data *ddata = to_panel_data(dssdev);
  57         struct omap_dss_device *in = ddata->in;
  58
  59         WARN_ON(!omapdss_device_is_connected(dssdev));
  60         if (!omapdss_device_is_connected(dssdev))
  61                 return;
  62
  63         WARN_ON(dst != dssdev->dst);
  64         if (dst != dssdev->dst)
  65                 return;
  66
  67         dst->src = NULL;
  68         dssdev->dst = NULL;
  69
  70         in->ops.dpi->disconnect(in, &ddata->dssdev);
  71 }
  72
  73 static int tfp410_enable(struct omap_dss_device *dssdev)
  74 {
  75         struct panel_drv_data *ddata = to_panel_data(dssdev);
  76         struct omap_dss_device *in = ddata->in;
  77         int r;
  78
  79         if (!omapdss_device_is_connected(dssdev))
  80                 return -ENODEV;
  81
  82         if (omapdss_device_is_enabled(dssdev))
  83                 return 0;
  84
  85         in->ops.dpi->set_timings(in, &ddata->timings);
  86         if (ddata->data_lines)
  87                 in->ops.dpi->set_data_lines(in, ddata->data_lines);
  88
  89         r = in->ops.dpi->enable(in);
  90         if (r)
  91                 return r;
  92
  93         if (gpio_is_valid(ddata->pd_gpio))
  94                 gpio_set_value_cansleep(ddata->pd_gpio, 1);
  95
  96         dssdev->state = OMAP_DSS_DISPLAY_ACTIVE;
  97
  98         return 0;
  99 }
 100
 101 static void tfp410_disable(struct omap_dss_device *dssdev)
 102 {
 103         struct panel_drv_data *ddata = to_panel_data(dssdev);
 104         struct omap_dss_device *in = ddata->in;
 105
 106         if (!omapdss_device_is_enabled(dssdev))
 107                 return;
 108
 109         if (gpio_is_valid(ddata->pd_gpio))
 110                 gpio_set_value_cansleep(ddata->pd_gpio, 0);
 111
 112         in->ops.dpi->disable(in);
 113
 114         dssdev->state = OMAP_DSS_DISPLAY_DISABLED;
 115 }
 116
 117 static void tfp410_fix_timings(struct omap_video_timings *timings)
 118 {
 119         timings->data_pclk_edge = OMAPDSS_DRIVE_SIG_RISING_EDGE;
 120         timings->sync_pclk_edge = OMAPDSS_DRIVE_SIG_RISING_EDGE;
 121         timings->de_level = OMAPDSS_SIG_ACTIVE_HIGH;
 122 }
 123
 124 static void tfp410_set_timings(struct omap_dss_device *dssdev,
 125                 struct omap_video_timings *timings)
 126 {
 127         struct panel_drv_data *ddata = to_panel_data(dssdev);
 128         struct omap_dss_device *in = ddata->in;
 129
 130         tfp410_fix_timings(timings);
 131
 132         ddata->timings = *timings;
 133         dssdev->panel.timings = *timings;
 134
 135         in->ops.dpi->set_timings(in, timings);
 136 }
 137
 138 static void tfp410_get_timings(struct omap_dss_device *dssdev,
 139                 struct omap_video_timings *timings)
 140 {
 141         struct panel_drv_data *ddata = to_panel_data(dssdev);
 142
 143         *timings = ddata->timings;
 144 }
 145
 146 static int tfp410_check_timings(struct omap_dss_device *dssdev,
 147                 struct omap_video_timings *timings)
 148 {
 149         struct panel_drv_data *ddata = to_panel_data(dssdev);
 150         struct omap_dss_device *in = ddata->in;
 151
 152         tfp410_fix_timings(timings);
 153
 154         return in->ops.dpi->check_timings(in, timings);
 155 }
 156
 157 static const struct omapdss_dvi_ops tfp410_dvi_ops = {
 158         .connect        = tfp410_connect,
 159         .disconnect     = tfp410_disconnect,
 160
 161         .enable         = tfp410_enable,
 162         .disable        = tfp410_disable,
 163
 164         .check_timings  = tfp410_check_timings,
 165         .set_timings    = tfp410_set_timings,
 166         .get_timings    = tfp410_get_timings,
 167 };
 168
 169 static int tfp410_probe_of(struct platform_device *pdev)
 170 {
 171         struct panel_drv_data *ddata = platform_get_drvdata(pdev);
 172         struct device_node *node = pdev->dev.of_node;
 173         struct omap_dss_device *in;
 174         int gpio;
 175
 176         gpio = of_get_named_gpio(node, "powerdown-gpios", 0);
 177
 178         if (gpio_is_valid(gpio) || gpio == -ENOENT) {
 179                 ddata->pd_gpio = gpio;
 180         } else {
 181                 dev_err(&pdev->dev, "failed to parse PD gpio\n");
 182                 return gpio;
 183         }
 184
 185         in = omapdss_of_find_source_for_first_ep(node);
 186         if (IS_ERR(in)) {
 187                 dev_err(&pdev->dev, "failed to find video source\n");
 188                 return PTR_ERR(in);
 189         }
 190
 191         ddata->in = in;
 192
 193         return 0;
 194 }
 195
 196 static int tfp410_probe(struct platform_device *pdev)
 197 {
 198         struct panel_drv_data *ddata;
 199         struct omap_dss_device *dssdev;
 200         int r;
 201
 202         ddata = devm_kzalloc(&pdev->dev, sizeof(*ddata), GFP_KERNEL);
 203         if (!ddata)
 204                 return -ENOMEM;
 205
 206         platform_set_drvdata(pdev, ddata);
 207
 208         if (!pdev->dev.of_node)
 209                 return -ENODEV;
 210
 211         r = tfp410_probe_of(pdev);
 212         if (r)
 213                 return r;
 214
 215         if (gpio_is_valid(ddata->pd_gpio)) {
 216                 r = devm_gpio_request_one(&pdev->dev, ddata->pd_gpio,
 217                                 GPIOF_OUT_INIT_LOW, "tfp410 PD");
 218                 if (r) {
 219                         dev_err(&pdev->dev, "Failed to request PD GPIO %d\n",
 220                                         ddata->pd_gpio);
 221                         goto err_gpio;
 222                 }
 223         }
 224
 225         dssdev = &ddata->dssdev;
 226         dssdev->ops.dvi = &tfp410_dvi_ops;
 227         dssdev->dev = &pdev->dev;
 228         dssdev->type = OMAP_DISPLAY_TYPE_DPI;
 229         dssdev->output_type = OMAP_DISPLAY_TYPE_DVI;
 230         dssdev->owner = THIS_MODULE;
 231         dssdev->phy.dpi.data_lines = ddata->data_lines;
 232         dssdev->port_num = 1;
 233
 234         r = omapdss_register_output(dssdev);
 235         if (r) {
 236                 dev_err(&pdev->dev, "Failed to register output\n");
 237                 goto err_reg;
 238         }
 239
 240         return 0;
 241 err_reg:
 242 err_gpio:
 243         omap_dss_put_device(ddata->in);
 244         return r;
 245 }
 246
 247 static int __exit tfp410_remove(struct platform_device *pdev)
 248 {
 249         struct panel_drv_data *ddata = platform_get_drvdata(pdev);
 250         struct omap_dss_device *dssdev = &ddata->dssdev;
 251         struct omap_dss_device *in = ddata->in;
 252
 253         omapdss_unregister_output(&ddata->dssdev);
 254
 255         WARN_ON(omapdss_device_is_enabled(dssdev));
 256         if (omapdss_device_is_enabled(dssdev))
 257                 tfp410_disable(dssdev);
 258
 259         WARN_ON(omapdss_device_is_connected(dssdev));
 260         if (omapdss_device_is_connected(dssdev))
 261                 tfp410_disconnect(dssdev, dssdev->dst);
 262
 263         omap_dss_put_device(in);
 264
 265         return 0;
 266 }
 267
 268 static const struct of_device_id tfp410_of_match[] = {
 269         { .compatible = "omapdss,ti,tfp410", },
 270         {},
 271 };
 272
 273 MODULE_DEVICE_TABLE(of, tfp410_of_match);
 274
 275 static struct platform_driver tfp410_driver = {
 276         .probe  = tfp410_probe,
 277         .remove = __exit_p(tfp410_remove),
 278         .driver = {
 279                 .name   = "tfp410",
 280                 .of_match_table = tfp410_of_match,
 281                 .suppress_bind_attrs = true,
 282         },
 283 };
 284
 285 module_platform_driver(tfp410_driver);
 286
 287 MODULE_AUTHOR("Tomi Valkeinen <tomi.valkeinen@ti.com>");
 288 MODULE_DESCRIPTION("TFP410 DPI to DVI encoder driver");
 289 MODULE_LICENSE("GPL");