drivers/video/fbdev/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 #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_set_timings(struct omap_dss_device *dssdev,
 118                 struct omap_video_timings *timings)
 119 {
 120         struct panel_drv_data *ddata = to_panel_data(dssdev);
 121         struct omap_dss_device *in = ddata->in;
 122
 123         ddata->timings = *timings;
 124         dssdev->panel.timings = *timings;
 125
 126         in->ops.dpi->set_timings(in, timings);
 127 }
 128
 129 static void tfp410_get_timings(struct omap_dss_device *dssdev,
 130                 struct omap_video_timings *timings)
 131 {
 132         struct panel_drv_data *ddata = to_panel_data(dssdev);
 133
 134         *timings = ddata->timings;
 135 }
 136
 137 static int tfp410_check_timings(struct omap_dss_device *dssdev,
 138                 struct omap_video_timings *timings)
 139 {
 140         struct panel_drv_data *ddata = to_panel_data(dssdev);
 141         struct omap_dss_device *in = ddata->in;
 142
 143         return in->ops.dpi->check_timings(in, timings);
 144 }
 145
 146 static const struct omapdss_dvi_ops tfp410_dvi_ops = {
 147         .connect        = tfp410_connect,
 148         .disconnect     = tfp410_disconnect,
 149
 150         .enable         = tfp410_enable,
 151         .disable        = tfp410_disable,
 152
 153         .check_timings  = tfp410_check_timings,
 154         .set_timings    = tfp410_set_timings,
 155         .get_timings    = tfp410_get_timings,
 156 };
 157
 158 static int tfp410_probe_pdata(struct platform_device *pdev)
 159 {
 160         struct panel_drv_data *ddata = platform_get_drvdata(pdev);
 161         struct encoder_tfp410_platform_data *pdata;
 162         struct omap_dss_device *dssdev, *in;
 163
 164         pdata = dev_get_platdata(&pdev->dev);
 165
 166         ddata->pd_gpio = pdata->power_down_gpio;
 167
 168         ddata->data_lines = pdata->data_lines;
 169
 170         in = omap_dss_find_output(pdata->source);
 171         if (in == NULL) {
 172                 dev_err(&pdev->dev, "Failed to find video source\n");
 173                 return -ENODEV;
 174         }
 175
 176         ddata->in = in;
 177
 178         dssdev = &ddata->dssdev;
 179         dssdev->name = pdata->name;
 180
 181         return 0;
 182 }
 183
 184 static int tfp410_probe_of(struct platform_device *pdev)
 185 {
 186         struct panel_drv_data *ddata = platform_get_drvdata(pdev);
 187         struct device_node *node = pdev->dev.of_node;
 188         struct omap_dss_device *in;
 189         int gpio;
 190
 191         gpio = of_get_named_gpio(node, "powerdown-gpios", 0);
 192
 193         if (gpio_is_valid(gpio) || gpio == -ENOENT) {
 194                 ddata->pd_gpio = gpio;
 195         } else {
 196                 dev_err(&pdev->dev, "failed to parse PD gpio\n");
 197                 return gpio;
 198         }
 199
 200         in = omapdss_of_find_source_for_first_ep(node);
 201         if (IS_ERR(in)) {
 202                 dev_err(&pdev->dev, "failed to find video source\n");
 203                 return PTR_ERR(in);
 204         }
 205
 206         ddata->in = in;
 207
 208         return 0;
 209 }
 210
 211 static int tfp410_probe(struct platform_device *pdev)
 212 {
 213         struct panel_drv_data *ddata;
 214         struct omap_dss_device *dssdev;
 215         int r;
 216
 217         ddata = devm_kzalloc(&pdev->dev, sizeof(*ddata), GFP_KERNEL);
 218         if (!ddata)
 219                 return -ENOMEM;
 220
 221         platform_set_drvdata(pdev, ddata);
 222
 223         if (dev_get_platdata(&pdev->dev)) {
 224                 r = tfp410_probe_pdata(pdev);
 225                 if (r)
 226                         return r;
 227         } else if (pdev->dev.of_node) {
 228                 r = tfp410_probe_of(pdev);
 229                 if (r)
 230                         return r;
 231         } else {
 232                 return -ENODEV;
 233         }
 234
 235         if (gpio_is_valid(ddata->pd_gpio)) {
 236                 r = devm_gpio_request_one(&pdev->dev, ddata->pd_gpio,
 237                                 GPIOF_OUT_INIT_LOW, "tfp410 PD");
 238                 if (r) {
 239                         dev_err(&pdev->dev, "Failed to request PD GPIO %d\n",
 240                                         ddata->pd_gpio);
 241                         goto err_gpio;
 242                 }
 243         }
 244
 245         dssdev = &ddata->dssdev;
 246         dssdev->ops.dvi = &tfp410_dvi_ops;
 247         dssdev->dev = &pdev->dev;
 248         dssdev->type = OMAP_DISPLAY_TYPE_DPI;
 249         dssdev->output_type = OMAP_DISPLAY_TYPE_DVI;
 250         dssdev->owner = THIS_MODULE;
 251         dssdev->phy.dpi.data_lines = ddata->data_lines;
 252
 253         r = omapdss_register_output(dssdev);
 254         if (r) {
 255                 dev_err(&pdev->dev, "Failed to register output\n");
 256                 goto err_reg;
 257         }
 258
 259         return 0;
 260 err_reg:
 261 err_gpio:
 262         omap_dss_put_device(ddata->in);
 263         return r;
 264 }
 265
 266 static int __exit tfp410_remove(struct platform_device *pdev)
 267 {
 268         struct panel_drv_data *ddata = platform_get_drvdata(pdev);
 269         struct omap_dss_device *dssdev = &ddata->dssdev;
 270         struct omap_dss_device *in = ddata->in;
 271
 272         omapdss_unregister_output(&ddata->dssdev);
 273
 274         WARN_ON(omapdss_device_is_enabled(dssdev));
 275         if (omapdss_device_is_enabled(dssdev))
 276                 tfp410_disable(dssdev);
 277
 278         WARN_ON(omapdss_device_is_connected(dssdev));
 279         if (omapdss_device_is_connected(dssdev))
 280                 tfp410_disconnect(dssdev, dssdev->dst);
 281
 282         omap_dss_put_device(in);
 283
 284         return 0;
 285 }
 286
 287 static const struct of_device_id tfp410_of_match[] = {
 288         { .compatible = "omapdss,ti,tfp410", },
 289         {},
 290 };
 291
 292 MODULE_DEVICE_TABLE(of, tfp410_of_match);
 293
 294 static struct platform_driver tfp410_driver = {
 295         .probe  = tfp410_probe,
 296         .remove = __exit_p(tfp410_remove),
 297         .driver = {
 298                 .name   = "tfp410",
 299                 .owner  = THIS_MODULE,
 300                 .of_match_table = tfp410_of_match,
 301                 .suppress_bind_attrs = true,
 302         },
 303 };
 304
 305 module_platform_driver(tfp410_driver);
 306
 307 MODULE_AUTHOR("Tomi Valkeinen <tomi.valkeinen@ti.com>");
 308 MODULE_DESCRIPTION("TFP410 DPI to DVI encoder driver");
 309 MODULE_LICENSE("GPL");