drivers/video/fbdev/omap2/omapfb/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/omapfb_dss.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         if (ddata->data_lines)
  86                 in->ops.dpi->set_data_lines(in, ddata->data_lines);
  87
  88         r = in->ops.dpi->enable(in);
  89         if (r)
  90                 return r;
  91
  92         if (gpio_is_valid(ddata->pd_gpio))
  93                 gpio_set_value_cansleep(ddata->pd_gpio, 1);
  94
  95         dssdev->state = OMAP_DSS_DISPLAY_ACTIVE;
  96
  97         return 0;
  98 }
  99
 100 static void tfp410_disable(struct omap_dss_device *dssdev)
 101 {
 102         struct panel_drv_data *ddata = to_panel_data(dssdev);
 103         struct omap_dss_device *in = ddata->in;
 104
 105         if (!omapdss_device_is_enabled(dssdev))
 106                 return;
 107
 108         if (gpio_is_valid(ddata->pd_gpio))
 109                 gpio_set_value_cansleep(ddata->pd_gpio, 0);
 110
 111         in->ops.dpi->disable(in);
 112
 113         dssdev->state = OMAP_DSS_DISPLAY_DISABLED;
 114 }
 115
 116 static void tfp410_fix_timings(struct omap_video_timings *timings)
 117 {
 118         timings->data_pclk_edge = OMAPDSS_DRIVE_SIG_RISING_EDGE;
 119         timings->sync_pclk_edge = OMAPDSS_DRIVE_SIG_RISING_EDGE;
 120         timings->de_level = OMAPDSS_SIG_ACTIVE_HIGH;
 121 }
 122
 123 static void tfp410_set_timings(struct omap_dss_device *dssdev,
 124                 struct omap_video_timings *timings)
 125 {
 126         struct panel_drv_data *ddata = to_panel_data(dssdev);
 127         struct omap_dss_device *in = ddata->in;
 128
 129         tfp410_fix_timings(timings);
 130
 131         ddata->timings = *timings;
 132         dssdev->panel.timings = *timings;
 133
 134         in->ops.dpi->set_timings(in, timings);
 135 }
 136
 137 static void tfp410_get_timings(struct omap_dss_device *dssdev,
 138                 struct omap_video_timings *timings)
 139 {
 140         struct panel_drv_data *ddata = to_panel_data(dssdev);
 141
 142         *timings = ddata->timings;
 143 }
 144
 145 static int tfp410_check_timings(struct omap_dss_device *dssdev,
 146                 struct omap_video_timings *timings)
 147 {
 148         struct panel_drv_data *ddata = to_panel_data(dssdev);
 149         struct omap_dss_device *in = ddata->in;
 150
 151         tfp410_fix_timings(timings);
 152
 153         return in->ops.dpi->check_timings(in, timings);
 154 }
 155
 156 static const struct omapdss_dvi_ops tfp410_dvi_ops = {
 157         .connect        = tfp410_connect,
 158         .disconnect     = tfp410_disconnect,
 159
 160         .enable         = tfp410_enable,
 161         .disable        = tfp410_disable,
 162
 163         .check_timings  = tfp410_check_timings,
 164         .set_timings    = tfp410_set_timings,
 165         .get_timings    = tfp410_get_timings,
 166 };
 167
 168 static int tfp410_probe_of(struct platform_device *pdev)
 169 {
 170         struct panel_drv_data *ddata = platform_get_drvdata(pdev);
 171         struct device_node *node = pdev->dev.of_node;
 172         struct omap_dss_device *in;
 173         int gpio;
 174
 175         gpio = of_get_named_gpio(node, "powerdown-gpios", 0);
 176
 177         if (gpio_is_valid(gpio) || gpio == -ENOENT) {
 178                 ddata->pd_gpio = gpio;
 179         } else {
 180                 dev_err(&pdev->dev, "failed to parse PD gpio\n");
 181                 return gpio;
 182         }
 183
 184         in = omapdss_of_find_source_for_first_ep(node);
 185         if (IS_ERR(in)) {
 186                 dev_err(&pdev->dev, "failed to find video source\n");
 187                 return PTR_ERR(in);
 188         }
 189
 190         ddata->in = in;
 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         if (!pdev->dev.of_node)
 202                 return -ENODEV;
 203
 204         ddata = devm_kzalloc(&pdev->dev, sizeof(*ddata), GFP_KERNEL);
 205         if (!ddata)
 206                 return -ENOMEM;
 207
 208         platform_set_drvdata(pdev, ddata);
 209
 210         r = tfp410_probe_of(pdev);
 211         if (r)
 212                 return r;
 213
 214         if (gpio_is_valid(ddata->pd_gpio)) {
 215                 r = devm_gpio_request_one(&pdev->dev, ddata->pd_gpio,
 216                                 GPIOF_OUT_INIT_LOW, "tfp410 PD");
 217                 if (r) {
 218                         dev_err(&pdev->dev, "Failed to request PD GPIO %d\n",
 219                                         ddata->pd_gpio);
 220                         goto err_gpio;
 221                 }
 222         }
 223
 224         dssdev = &ddata->dssdev;
 225         dssdev->ops.dvi = &tfp410_dvi_ops;
 226         dssdev->dev = &pdev->dev;
 227         dssdev->type = OMAP_DISPLAY_TYPE_DPI;
 228         dssdev->output_type = OMAP_DISPLAY_TYPE_DVI;
 229         dssdev->owner = THIS_MODULE;
 230         dssdev->phy.dpi.data_lines = ddata->data_lines;
 231         dssdev->port_num = 1;
 232
 233         r = omapdss_register_output(dssdev);
 234         if (r) {
 235                 dev_err(&pdev->dev, "Failed to register output\n");
 236                 goto err_reg;
 237         }
 238
 239         return 0;
 240 err_reg:
 241 err_gpio:
 242         omap_dss_put_device(ddata->in);
 243         return r;
 244 }
 245
 246 static int __exit tfp410_remove(struct platform_device *pdev)
 247 {
 248         struct panel_drv_data *ddata = platform_get_drvdata(pdev);
 249         struct omap_dss_device *dssdev = &ddata->dssdev;
 250         struct omap_dss_device *in = ddata->in;
 251
 252         omapdss_unregister_output(&ddata->dssdev);
 253
 254         WARN_ON(omapdss_device_is_enabled(dssdev));
 255         if (omapdss_device_is_enabled(dssdev))
 256                 tfp410_disable(dssdev);
 257
 258         WARN_ON(omapdss_device_is_connected(dssdev));
 259         if (omapdss_device_is_connected(dssdev))
 260                 tfp410_disconnect(dssdev, dssdev->dst);
 261
 262         omap_dss_put_device(in);
 263
 264         return 0;
 265 }
 266
 267 static const struct of_device_id tfp410_of_match[] = {
 268         { .compatible = "omapdss,ti,tfp410", },
 269         {},
 270 };
 271
 272 MODULE_DEVICE_TABLE(of, tfp410_of_match);
 273
 274 static struct platform_driver tfp410_driver = {
 275         .probe  = tfp410_probe,
 276         .remove = __exit_p(tfp410_remove),
 277         .driver = {
 278                 .name   = "tfp410",
 279                 .of_match_table = tfp410_of_match,
 280                 .suppress_bind_attrs = true,
 281         },
 282 };
 283
 284 module_platform_driver(tfp410_driver);
 285
 286 MODULE_AUTHOR("Tomi Valkeinen <tomi.valkeinen@ti.com>");
 287 MODULE_DESCRIPTION("TFP410 DPI to DVI encoder driver");
 288 MODULE_LICENSE("GPL");