drivers/video/fbdev/omap2/omapfb/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/mod_devicetable.h>
  16 #include <linux/slab.h>
  17 #include <linux/platform_device.h>
  18 #include <linux/gpio/consumer.h>
  19
  20 #include <video/omapfb_dss.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         if (ddata->ct_cp_hpd_gpio) {
  50                 gpiod_set_value_cansleep(ddata->ct_cp_hpd_gpio, 1);
  51                 /* DC-DC converter needs at max 300us to get to 90% of 5V */
  52                 udelay(300);
  53         }
  54
  55         return 0;
  56 }
  57
  58 static void tpd_disconnect(struct omap_dss_device *dssdev,
  59                 struct omap_dss_device *dst)
  60 {
  61         struct panel_drv_data *ddata = to_panel_data(dssdev);
  62         struct omap_dss_device *in = ddata->in;
  63
  64         WARN_ON(dst != dssdev->dst);
  65
  66         if (dst != dssdev->dst)
  67                 return;
  68
  69         gpiod_set_value_cansleep(ddata->ct_cp_hpd_gpio, 0);
  70
  71         dst->src = NULL;
  72         dssdev->dst = NULL;
  73
  74         in->ops.hdmi->disconnect(in, &ddata->dssdev);
  75 }
  76
  77 static int tpd_enable(struct omap_dss_device *dssdev)
  78 {
  79         struct panel_drv_data *ddata = to_panel_data(dssdev);
  80         struct omap_dss_device *in = ddata->in;
  81         int r;
  82
  83         if (dssdev->state == OMAP_DSS_DISPLAY_ACTIVE)
  84                 return 0;
  85
  86         in->ops.hdmi->set_timings(in, &ddata->timings);
  87
  88         r = in->ops.hdmi->enable(in);
  89         if (r)
  90                 return r;
  91
  92         dssdev->state = OMAP_DSS_DISPLAY_ACTIVE;
  93
  94         return r;
  95 }
  96
  97 static void tpd_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 (dssdev->state != OMAP_DSS_DISPLAY_ACTIVE)
 103                 return;
 104
 105         in->ops.hdmi->disable(in);
 106
 107         dssdev->state = OMAP_DSS_DISPLAY_DISABLED;
 108 }
 109
 110 static void tpd_set_timings(struct omap_dss_device *dssdev,
 111                 struct omap_video_timings *timings)
 112 {
 113         struct panel_drv_data *ddata = to_panel_data(dssdev);
 114         struct omap_dss_device *in = ddata->in;
 115
 116         ddata->timings = *timings;
 117         dssdev->panel.timings = *timings;
 118
 119         in->ops.hdmi->set_timings(in, timings);
 120 }
 121
 122 static void tpd_get_timings(struct omap_dss_device *dssdev,
 123                 struct omap_video_timings *timings)
 124 {
 125         struct panel_drv_data *ddata = to_panel_data(dssdev);
 126
 127         *timings = ddata->timings;
 128 }
 129
 130 static int tpd_check_timings(struct omap_dss_device *dssdev,
 131                 struct omap_video_timings *timings)
 132 {
 133         struct panel_drv_data *ddata = to_panel_data(dssdev);
 134         struct omap_dss_device *in = ddata->in;
 135         int r;
 136
 137         r = in->ops.hdmi->check_timings(in, timings);
 138
 139         return r;
 140 }
 141
 142 static int tpd_read_edid(struct omap_dss_device *dssdev,
 143                 u8 *edid, int len)
 144 {
 145         struct panel_drv_data *ddata = to_panel_data(dssdev);
 146         struct omap_dss_device *in = ddata->in;
 147         int r;
 148
 149         if (!gpiod_get_value_cansleep(ddata->hpd_gpio))
 150                 return -ENODEV;
 151
 152         gpiod_set_value_cansleep(ddata->ls_oe_gpio, 1);
 153
 154         r = in->ops.hdmi->read_edid(in, edid, len);
 155
 156         gpiod_set_value_cansleep(ddata->ls_oe_gpio, 0);
 157
 158         return r;
 159 }
 160
 161 static bool tpd_detect(struct omap_dss_device *dssdev)
 162 {
 163         struct panel_drv_data *ddata = to_panel_data(dssdev);
 164
 165         return gpiod_get_value_cansleep(ddata->hpd_gpio);
 166 }
 167
 168 static int tpd_set_infoframe(struct omap_dss_device *dssdev,
 169                 const struct hdmi_avi_infoframe *avi)
 170 {
 171         struct panel_drv_data *ddata = to_panel_data(dssdev);
 172         struct omap_dss_device *in = ddata->in;
 173
 174         return in->ops.hdmi->set_infoframe(in, avi);
 175 }
 176
 177 static int tpd_set_hdmi_mode(struct omap_dss_device *dssdev,
 178                 bool hdmi_mode)
 179 {
 180         struct panel_drv_data *ddata = to_panel_data(dssdev);
 181         struct omap_dss_device *in = ddata->in;
 182
 183         return in->ops.hdmi->set_hdmi_mode(in, hdmi_mode);
 184 }
 185
 186 static const struct omapdss_hdmi_ops tpd_hdmi_ops = {
 187         .connect                = tpd_connect,
 188         .disconnect             = tpd_disconnect,
 189
 190         .enable                 = tpd_enable,
 191         .disable                = tpd_disable,
 192
 193         .check_timings          = tpd_check_timings,
 194         .set_timings            = tpd_set_timings,
 195         .get_timings            = tpd_get_timings,
 196
 197         .read_edid              = tpd_read_edid,
 198         .detect                 = tpd_detect,
 199         .set_infoframe          = tpd_set_infoframe,
 200         .set_hdmi_mode          = tpd_set_hdmi_mode,
 201 };
 202
 203 static int tpd_probe_of(struct platform_device *pdev)
 204 {
 205         struct panel_drv_data *ddata = platform_get_drvdata(pdev);
 206         struct device_node *node = pdev->dev.of_node;
 207         struct omap_dss_device *in;
 208
 209         in = omapdss_of_find_source_for_first_ep(node);
 210         if (IS_ERR(in)) {
 211                 dev_err(&pdev->dev, "failed to find video source\n");
 212                 return PTR_ERR(in);
 213         }
 214
 215         ddata->in = in;
 216
 217         return 0;
 218 }
 219
 220 static int tpd_probe(struct platform_device *pdev)
 221 {
 222         struct omap_dss_device *dssdev;
 223         struct panel_drv_data *ddata;
 224         int r;
 225         struct gpio_desc *gpio;
 226
 227         ddata = devm_kzalloc(&pdev->dev, sizeof(*ddata), GFP_KERNEL);
 228         if (!ddata)
 229                 return -ENOMEM;
 230
 231         platform_set_drvdata(pdev, ddata);
 232
 233         if (pdev->dev.of_node) {
 234                 r = tpd_probe_of(pdev);
 235                 if (r)
 236                         return r;
 237         } else {
 238                 return -ENODEV;
 239         }
 240
 241         gpio = devm_gpiod_get_index_optional(&pdev->dev, NULL, 0,
 242                 GPIOD_OUT_LOW);
 243         if (IS_ERR(gpio)) {
 244                 r = PTR_ERR(gpio);
 245                 goto err_gpio;
 246         }
 247
 248         ddata->ct_cp_hpd_gpio = gpio;
 249
 250         gpio = devm_gpiod_get_index_optional(&pdev->dev, NULL, 1,
 251                 GPIOD_OUT_LOW);
 252         if (IS_ERR(gpio)) {
 253                 r = PTR_ERR(gpio);
 254                 goto err_gpio;
 255         }
 256
 257         ddata->ls_oe_gpio = gpio;
 258
 259         gpio = devm_gpiod_get_index(&pdev->dev, NULL, 2,
 260                 GPIOD_IN);
 261         if (IS_ERR(gpio)) {
 262                 r = PTR_ERR(gpio);
 263                 goto err_gpio;
 264         }
 265
 266         ddata->hpd_gpio = gpio;
 267
 268         dssdev = &ddata->dssdev;
 269         dssdev->ops.hdmi = &tpd_hdmi_ops;
 270         dssdev->dev = &pdev->dev;
 271         dssdev->type = OMAP_DISPLAY_TYPE_HDMI;
 272         dssdev->output_type = OMAP_DISPLAY_TYPE_HDMI;
 273         dssdev->owner = THIS_MODULE;
 274         dssdev->port_num = 1;
 275
 276         r = omapdss_register_output(dssdev);
 277         if (r) {
 278                 dev_err(&pdev->dev, "Failed to register output\n");
 279                 goto err_reg;
 280         }
 281
 282         return 0;
 283 err_reg:
 284 err_gpio:
 285         omap_dss_put_device(ddata->in);
 286         return r;
 287 }
 288
 289 static int __exit tpd_remove(struct platform_device *pdev)
 290 {
 291         struct panel_drv_data *ddata = platform_get_drvdata(pdev);
 292         struct omap_dss_device *dssdev = &ddata->dssdev;
 293         struct omap_dss_device *in = ddata->in;
 294
 295         omapdss_unregister_output(&ddata->dssdev);
 296
 297         WARN_ON(omapdss_device_is_enabled(dssdev));
 298         if (omapdss_device_is_enabled(dssdev))
 299                 tpd_disable(dssdev);
 300
 301         WARN_ON(omapdss_device_is_connected(dssdev));
 302         if (omapdss_device_is_connected(dssdev))
 303                 tpd_disconnect(dssdev, dssdev->dst);
 304
 305         omap_dss_put_device(in);
 306
 307         return 0;
 308 }
 309
 310 static const struct of_device_id tpd_of_match[] = {
 311         { .compatible = "omapdss,ti,tpd12s015", },
 312         {},
 313 };
 314
 315 MODULE_DEVICE_TABLE(of, tpd_of_match);
 316
 317 static struct platform_driver tpd_driver = {
 318         .probe  = tpd_probe,
 319         .remove = __exit_p(tpd_remove),
 320         .driver = {
 321                 .name   = "tpd12s015",
 322                 .of_match_table = tpd_of_match,
 323                 .suppress_bind_attrs = true,
 324         },
 325 };
 326
 327 module_platform_driver(tpd_driver);
 328
 329 MODULE_AUTHOR("Tomi Valkeinen <tomi.valkeinen@ti.com>");
 330 MODULE_DESCRIPTION("TPD12S015 driver");
 331 MODULE_LICENSE("GPL");