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 = ddata->in;
  36         int r;
  37
  38         if (omapdss_device_is_connected(dssdev))
  39                 return -EBUSY;
  40
  41         r = in->ops.dpi->connect(in, dssdev);
  42         if (r)
  43                 return r;
  44
  45         dst->src = dssdev;
  46         dssdev->dst = dst;
  47
  48         return 0;
  49 }
  50
  51 static void tfp410_disconnect(struct omap_dss_device *dssdev,
  52                 struct omap_dss_device *dst)
  53 {
  54         struct panel_drv_data *ddata = to_panel_data(dssdev);
  55         struct omap_dss_device *in = ddata->in;
  56
  57         WARN_ON(!omapdss_device_is_connected(dssdev));
  58         if (!omapdss_device_is_connected(dssdev))
  59                 return;
  60
  61         WARN_ON(dst != dssdev->dst);
  62         if (dst != dssdev->dst)
  63                 return;
  64
  65         dst->src = NULL;
  66         dssdev->dst = NULL;
  67
  68         in->ops.dpi->disconnect(in, &ddata->dssdev);
  69 }
  70
  71 static int tfp410_enable(struct omap_dss_device *dssdev)
  72 {
  73         struct panel_drv_data *ddata = to_panel_data(dssdev);
  74         struct omap_dss_device *in = ddata->in;
  75         int r;
  76
  77         if (!omapdss_device_is_connected(dssdev))
  78                 return -ENODEV;
  79
  80         if (omapdss_device_is_enabled(dssdev))
  81                 return 0;
  82
  83         in->ops.dpi->set_timings(in, &ddata->vm);
  84
  85         r = in->ops.dpi->enable(in);
  86         if (r)
  87                 return r;
  88
  89         if (gpio_is_valid(ddata->pd_gpio))
  90                 gpio_set_value_cansleep(ddata->pd_gpio, 1);
  91
  92         dssdev->state = OMAP_DSS_DISPLAY_ACTIVE;
  93
  94         return 0;
  95 }
  96
  97 static void tfp410_disable(struct omap_dss_device *dssdev)
  98 {
  99         struct panel_drv_data *ddata = to_panel_data(dssdev);
 100         struct omap_dss_device *in = ddata->in;
 101
 102         if (!omapdss_device_is_enabled(dssdev))
 103                 return;
 104
 105         if (gpio_is_valid(ddata->pd_gpio))
 106                 gpio_set_value_cansleep(ddata->pd_gpio, 0);
 107
 108         in->ops.dpi->disable(in);
 109
 110         dssdev->state = OMAP_DSS_DISPLAY_DISABLED;
 111 }
 112
 113 static void tfp410_fix_timings(struct videomode *vm)
 114 {
 115         vm->flags |= DISPLAY_FLAGS_DE_HIGH | DISPLAY_FLAGS_PIXDATA_POSEDGE |
 116                      DISPLAY_FLAGS_SYNC_POSEDGE;
 117 }
 118
 119 static void tfp410_set_timings(struct omap_dss_device *dssdev,
 120                                struct videomode *vm)
 121 {
 122         struct panel_drv_data *ddata = to_panel_data(dssdev);
 123         struct omap_dss_device *in = ddata->in;
 124
 125         tfp410_fix_timings(vm);
 126
 127         ddata->vm = *vm;
 128         dssdev->panel.vm = *vm;
 129
 130         in->ops.dpi->set_timings(in, vm);
 131 }
 132
 133 static void tfp410_get_timings(struct omap_dss_device *dssdev,
 134                                struct videomode *vm)
 135 {
 136         struct panel_drv_data *ddata = to_panel_data(dssdev);
 137
 138         *vm = ddata->vm;
 139 }
 140
 141 static int tfp410_check_timings(struct omap_dss_device *dssdev,
 142                                 struct videomode *vm)
 143 {
 144         struct panel_drv_data *ddata = to_panel_data(dssdev);
 145         struct omap_dss_device *in = ddata->in;
 146
 147         tfp410_fix_timings(vm);
 148
 149         return in->ops.dpi->check_timings(in, vm);
 150 }
 151
 152 static const struct omapdss_dvi_ops tfp410_dvi_ops = {
 153         .connect        = tfp410_connect,
 154         .disconnect     = tfp410_disconnect,
 155
 156         .enable         = tfp410_enable,
 157         .disable        = tfp410_disable,
 158
 159         .check_timings  = tfp410_check_timings,
 160         .set_timings    = tfp410_set_timings,
 161         .get_timings    = tfp410_get_timings,
 162 };
 163
 164 static int tfp410_probe_of(struct platform_device *pdev)
 165 {
 166         struct panel_drv_data *ddata = platform_get_drvdata(pdev);
 167         struct device_node *node = pdev->dev.of_node;
 168         struct omap_dss_device *in;
 169         int gpio;
 170
 171         gpio = of_get_named_gpio(node, "powerdown-gpios", 0);
 172
 173         if (gpio_is_valid(gpio) || gpio == -ENOENT) {
 174                 ddata->pd_gpio = gpio;
 175         } else {
 176                 if (gpio != -EPROBE_DEFER)
 177                         dev_err(&pdev->dev, "failed to parse PD gpio\n");
 178                 return gpio;
 179         }
 180
 181         in = omapdss_of_find_source_for_first_ep(node);
 182         if (IS_ERR(in)) {
 183                 dev_err(&pdev->dev, "failed to find video source\n");
 184                 return PTR_ERR(in);
 185         }
 186
 187         ddata->in = in;
 188
 189         return 0;
 190 }
 191
 192 static int tfp410_probe(struct platform_device *pdev)
 193 {
 194         struct panel_drv_data *ddata;
 195         struct omap_dss_device *dssdev;
 196         int r;
 197
 198         ddata = devm_kzalloc(&pdev->dev, sizeof(*ddata), GFP_KERNEL);
 199         if (!ddata)
 200                 return -ENOMEM;
 201
 202         platform_set_drvdata(pdev, ddata);
 203
 204         if (!pdev->dev.of_node)
 205                 return -ENODEV;
 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                         goto err_gpio;
 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                 goto err_reg;
 233         }
 234
 235         return 0;
 236 err_reg:
 237 err_gpio:
 238         omap_dss_put_device(ddata->in);
 239         return r;
 240 }
 241
 242 static int __exit tfp410_remove(struct platform_device *pdev)
 243 {
 244         struct panel_drv_data *ddata = platform_get_drvdata(pdev);
 245         struct omap_dss_device *dssdev = &ddata->dssdev;
 246         struct omap_dss_device *in = ddata->in;
 247
 248         omapdss_unregister_output(&ddata->dssdev);
 249
 250         WARN_ON(omapdss_device_is_enabled(dssdev));
 251         if (omapdss_device_is_enabled(dssdev))
 252                 tfp410_disable(dssdev);
 253
 254         WARN_ON(omapdss_device_is_connected(dssdev));
 255         if (omapdss_device_is_connected(dssdev))
 256                 tfp410_disconnect(dssdev, dssdev->dst);
 257
 258         omap_dss_put_device(in);
 259
 260         return 0;
 261 }
 262
 263 static const struct of_device_id tfp410_of_match[] = {
 264         { .compatible = "omapdss,ti,tfp410", },
 265         {},
 266 };
 267
 268 MODULE_DEVICE_TABLE(of, tfp410_of_match);
 269
 270 static struct platform_driver tfp410_driver = {
 271         .probe  = tfp410_probe,
 272         .remove = __exit_p(tfp410_remove),
 273         .driver = {
 274                 .name   = "tfp410",
 275                 .of_match_table = tfp410_of_match,
 276                 .suppress_bind_attrs = true,
 277         },
 278 };
 279
 280 module_platform_driver(tfp410_driver);
 281
 282 MODULE_AUTHOR("Tomi Valkeinen <tomi.valkeinen@ti.com>");
 283 MODULE_DESCRIPTION("TFP410 DPI to DVI encoder driver");
 284 MODULE_LICENSE("GPL");