drivers/gpu/drm/omapdrm/displays/encoder-tpd12s015.c

   1 /*
   2  * TPD12S015 HDMI ESD protection & level shifter chip 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/completion.h>
  13 #include <linux/delay.h>
  14 #include <linux/module.h>
  15 #include <linux/slab.h>
  16 #include <linux/platform_device.h>
  17 #include <linux/gpio/consumer.h>
  18
  19 #include <video/omapdss.h>
  20 #include <video/omap-panel-data.h>
  21
  22 struct panel_drv_data {
  23         struct omap_dss_device dssdev;
  24         struct omap_dss_device *in;
  25
  26         struct gpio_desc *ct_cp_hpd_gpio;
  27         struct gpio_desc *ls_oe_gpio;
  28         struct gpio_desc *hpd_gpio;
  29
  30         struct omap_video_timings timings;
  31 };
  32
  33 #define to_panel_data(x) container_of(x, struct panel_drv_data, dssdev)
  34
  35 static int tpd_connect(struct omap_dss_device *dssdev,
  36                 struct omap_dss_device *dst)
  37 {
  38         struct panel_drv_data *ddata = to_panel_data(dssdev);
  39         struct omap_dss_device *in = ddata->in;
  40         int r;
  41
  42         r = in->ops.hdmi->connect(in, dssdev);
  43         if (r)
  44                 return r;
  45
  46         dst->src = dssdev;
  47         dssdev->dst = dst;
  48
  49         gpiod_set_value_cansleep(ddata->ct_cp_hpd_gpio, 1);
  50         /* DC-DC converter needs at max 300us to get to 90% of 5V */
  51         udelay(300);
  52
  53         return 0;
  54 }
  55
  56 static void tpd_disconnect(struct omap_dss_device *dssdev,
  57                 struct omap_dss_device *dst)
  58 {
  59         struct panel_drv_data *ddata = to_panel_data(dssdev);
  60         struct omap_dss_device *in = ddata->in;
  61
  62         WARN_ON(dst != dssdev->dst);
  63
  64         if (dst != dssdev->dst)
  65                 return;
  66
  67         gpiod_set_value_cansleep(ddata->ct_cp_hpd_gpio, 0);
  68
  69         dst->src = NULL;
  70         dssdev->dst = NULL;
  71
  72         in->ops.hdmi->disconnect(in, &ddata->dssdev);
  73 }
  74
  75 static int tpd_enable(struct omap_dss_device *dssdev)
  76 {
  77         struct panel_drv_data *ddata = to_panel_data(dssdev);
  78         struct omap_dss_device *in = ddata->in;
  79         int r;
  80
  81         if (dssdev->state == OMAP_DSS_DISPLAY_ACTIVE)
  82                 return 0;
  83
  84         in->ops.hdmi->set_timings(in, &ddata->timings);
  85
  86         r = in->ops.hdmi->enable(in);
  87         if (r)
  88                 return r;
  89
  90         dssdev->state = OMAP_DSS_DISPLAY_ACTIVE;
  91
  92         return r;
  93 }
  94
  95 static void tpd_disable(struct omap_dss_device *dssdev)
  96 {
  97         struct panel_drv_data *ddata = to_panel_data(dssdev);
  98         struct omap_dss_device *in = ddata->in;
  99
 100         if (dssdev->state != OMAP_DSS_DISPLAY_ACTIVE)
 101                 return;
 102
 103         in->ops.hdmi->disable(in);
 104
 105         dssdev->state = OMAP_DSS_DISPLAY_DISABLED;
 106 }
 107
 108 static void tpd_set_timings(struct omap_dss_device *dssdev,
 109                 struct omap_video_timings *timings)
 110 {
 111         struct panel_drv_data *ddata = to_panel_data(dssdev);
 112         struct omap_dss_device *in = ddata->in;
 113
 114         ddata->timings = *timings;
 115         dssdev->panel.timings = *timings;
 116
 117         in->ops.hdmi->set_timings(in, timings);
 118 }
 119
 120 static void tpd_get_timings(struct omap_dss_device *dssdev,
 121                 struct omap_video_timings *timings)
 122 {
 123         struct panel_drv_data *ddata = to_panel_data(dssdev);
 124
 125         *timings = ddata->timings;
 126 }
 127
 128 static int tpd_check_timings(struct omap_dss_device *dssdev,
 129                 struct omap_video_timings *timings)
 130 {
 131         struct panel_drv_data *ddata = to_panel_data(dssdev);
 132         struct omap_dss_device *in = ddata->in;
 133         int r;
 134
 135         r = in->ops.hdmi->check_timings(in, timings);
 136
 137         return r;
 138 }
 139
 140 static int tpd_read_edid(struct omap_dss_device *dssdev,
 141                 u8 *edid, int len)
 142 {
 143         struct panel_drv_data *ddata = to_panel_data(dssdev);
 144         struct omap_dss_device *in = ddata->in;
 145         int r;
 146
 147         if (!gpiod_get_value_cansleep(ddata->hpd_gpio))
 148                 return -ENODEV;
 149
 150         gpiod_set_value_cansleep(ddata->ls_oe_gpio, 1);
 151
 152         r = in->ops.hdmi->read_edid(in, edid, len);
 153
 154         gpiod_set_value_cansleep(ddata->ls_oe_gpio, 0);
 155
 156         return r;
 157 }
 158
 159 static bool tpd_detect(struct omap_dss_device *dssdev)
 160 {
 161         struct panel_drv_data *ddata = to_panel_data(dssdev);
 162
 163         return gpiod_get_value_cansleep(ddata->hpd_gpio);
 164 }
 165
 166 static int tpd_set_infoframe(struct omap_dss_device *dssdev,
 167                 const struct hdmi_avi_infoframe *avi)
 168 {
 169         struct panel_drv_data *ddata = to_panel_data(dssdev);
 170         struct omap_dss_device *in = ddata->in;
 171
 172         return in->ops.hdmi->set_infoframe(in, avi);
 173 }
 174
 175 static int tpd_set_hdmi_mode(struct omap_dss_device *dssdev,
 176                 bool hdmi_mode)
 177 {
 178         struct panel_drv_data *ddata = to_panel_data(dssdev);
 179         struct omap_dss_device *in = ddata->in;
 180
 181         return in->ops.hdmi->set_hdmi_mode(in, hdmi_mode);
 182 }
 183
 184 static const struct omapdss_hdmi_ops tpd_hdmi_ops = {
 185         .connect                = tpd_connect,
 186         .disconnect             = tpd_disconnect,
 187
 188         .enable                 = tpd_enable,
 189         .disable                = tpd_disable,
 190
 191         .check_timings          = tpd_check_timings,
 192         .set_timings            = tpd_set_timings,
 193         .get_timings            = tpd_get_timings,
 194
 195         .read_edid              = tpd_read_edid,
 196         .detect                 = tpd_detect,
 197         .set_infoframe          = tpd_set_infoframe,
 198         .set_hdmi_mode          = tpd_set_hdmi_mode,
 199 };
 200
 201 static int tpd_probe_of(struct platform_device *pdev)
 202 {
 203         struct panel_drv_data *ddata = platform_get_drvdata(pdev);
 204         struct device_node *node = pdev->dev.of_node;
 205         struct omap_dss_device *in;
 206
 207         in = omapdss_of_find_source_for_first_ep(node);
 208         if (IS_ERR(in)) {
 209                 dev_err(&pdev->dev, "failed to find video source\n");
 210                 return PTR_ERR(in);
 211         }
 212
 213         ddata->in = in;
 214
 215         return 0;
 216 }
 217
 218 static int tpd_probe(struct platform_device *pdev)
 219 {
 220         struct omap_dss_device *in, *dssdev;
 221         struct panel_drv_data *ddata;
 222         int r;
 223         struct gpio_desc *gpio;
 224
 225         ddata = devm_kzalloc(&pdev->dev, sizeof(*ddata), GFP_KERNEL);
 226         if (!ddata)
 227                 return -ENOMEM;
 228
 229         platform_set_drvdata(pdev, ddata);
 230
 231         if (!pdev->dev.of_node)
 232                 return -ENODEV;
 233
 234         r = tpd_probe_of(pdev);
 235         if (r)
 236                 return r;
 237
 238
 239         gpio = devm_gpiod_get_index_optional(&pdev->dev, NULL, 0,
 240                  GPIOD_OUT_LOW);
 241         if (IS_ERR(gpio))
 242                 goto err_gpio;
 243
 244         ddata->ct_cp_hpd_gpio = gpio;
 245
 246         gpio = devm_gpiod_get_index_optional(&pdev->dev, NULL, 1,
 247                  GPIOD_OUT_LOW);
 248         if (IS_ERR(gpio))
 249                 goto err_gpio;
 250
 251         ddata->ls_oe_gpio = gpio;
 252
 253         gpio = devm_gpiod_get_index(&pdev->dev, NULL, 2,
 254                 GPIOD_IN);
 255         if (IS_ERR(gpio))
 256                 goto err_gpio;
 257
 258         ddata->hpd_gpio = gpio;
 259
 260         dssdev = &ddata->dssdev;
 261         dssdev->ops.hdmi = &tpd_hdmi_ops;
 262         dssdev->dev = &pdev->dev;
 263         dssdev->type = OMAP_DISPLAY_TYPE_HDMI;
 264         dssdev->output_type = OMAP_DISPLAY_TYPE_HDMI;
 265         dssdev->owner = THIS_MODULE;
 266         dssdev->port_num = 1;
 267
 268         in = ddata->in;
 269
 270         r = omapdss_register_output(dssdev);
 271         if (r) {
 272                 dev_err(&pdev->dev, "Failed to register output\n");
 273                 goto err_reg;
 274         }
 275
 276         return 0;
 277 err_reg:
 278 err_gpio:
 279         omap_dss_put_device(ddata->in);
 280         return r;
 281 }
 282
 283 static int __exit tpd_remove(struct platform_device *pdev)
 284 {
 285         struct panel_drv_data *ddata = platform_get_drvdata(pdev);
 286         struct omap_dss_device *dssdev = &ddata->dssdev;
 287         struct omap_dss_device *in = ddata->in;
 288
 289         omapdss_unregister_output(&ddata->dssdev);
 290
 291         WARN_ON(omapdss_device_is_enabled(dssdev));
 292         if (omapdss_device_is_enabled(dssdev))
 293                 tpd_disable(dssdev);
 294
 295         WARN_ON(omapdss_device_is_connected(dssdev));
 296         if (omapdss_device_is_connected(dssdev))
 297                 tpd_disconnect(dssdev, dssdev->dst);
 298
 299         omap_dss_put_device(in);
 300
 301         return 0;
 302 }
 303
 304 static const struct of_device_id tpd_of_match[] = {
 305         { .compatible = "omapdss,ti,tpd12s015", },
 306         {},
 307 };
 308
 309 MODULE_DEVICE_TABLE(of, tpd_of_match);
 310
 311 static struct platform_driver tpd_driver = {
 312         .probe  = tpd_probe,
 313         .remove = __exit_p(tpd_remove),
 314         .driver = {
 315                 .name   = "tpd12s015",
 316                 .of_match_table = tpd_of_match,
 317                 .suppress_bind_attrs = true,
 318         },
 319 };
 320
 321 module_platform_driver(tpd_driver);
 322
 323 MODULE_AUTHOR("Tomi Valkeinen <tomi.valkeinen@ti.com>");
 324 MODULE_DESCRIPTION("TPD12S015 driver");
 325 MODULE_LICENSE("GPL");