drivers/gpu/drm/omapdrm/displays/connector-hdmi.c

   1 /*
   2  * HDMI Connector 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/mutex.h>
  15 #include <linux/platform_device.h>
  16 #include <linux/slab.h>
  17
  18 #include "../dss/omapdss.h"
  19
  20 struct panel_drv_data {
  21         struct omap_dss_device dssdev;
  22         void (*hpd_cb)(void *cb_data, enum drm_connector_status status);
  23         void *hpd_cb_data;
  24         struct mutex hpd_lock;
  25
  26         struct device *dev;
  27
  28         struct gpio_desc *hpd_gpio;
  29 };
  30
  31 #define to_panel_data(x) container_of(x, struct panel_drv_data, dssdev)
  32
  33 static int hdmic_connect(struct omap_dss_device *src,
  34                          struct omap_dss_device *dst)
  35 {
  36         return 0;
  37 }
  38
  39 static void hdmic_disconnect(struct omap_dss_device *src,
  40                              struct omap_dss_device *dst)
  41 {
  42 }
  43
  44 static int hdmic_enable(struct omap_dss_device *dssdev)
  45 {
  46         struct panel_drv_data *ddata = to_panel_data(dssdev);
  47         struct omap_dss_device *src = dssdev->src;
  48         int r;
  49
  50         dev_dbg(ddata->dev, "enable\n");
  51
  52         if (!omapdss_device_is_connected(dssdev))
  53                 return -ENODEV;
  54
  55         if (omapdss_device_is_enabled(dssdev))
  56                 return 0;
  57
  58         r = src->ops->enable(src);
  59         if (r)
  60                 return r;
  61
  62         dssdev->state = OMAP_DSS_DISPLAY_ACTIVE;
  63
  64         return r;
  65 }
  66
  67 static void hdmic_disable(struct omap_dss_device *dssdev)
  68 {
  69         struct panel_drv_data *ddata = to_panel_data(dssdev);
  70         struct omap_dss_device *src = dssdev->src;
  71
  72         dev_dbg(ddata->dev, "disable\n");
  73
  74         if (!omapdss_device_is_enabled(dssdev))
  75                 return;
  76
  77         src->ops->disable(src);
  78
  79         dssdev->state = OMAP_DSS_DISPLAY_DISABLED;
  80 }
  81
  82 static bool hdmic_detect(struct omap_dss_device *dssdev)
  83 {
  84         struct panel_drv_data *ddata = to_panel_data(dssdev);
  85
  86         return gpiod_get_value_cansleep(ddata->hpd_gpio);
  87 }
  88
  89 static void hdmic_register_hpd_cb(struct omap_dss_device *dssdev,
  90                                   void (*cb)(void *cb_data,
  91                                             enum drm_connector_status status),
  92                                   void *cb_data)
  93 {
  94         struct panel_drv_data *ddata = to_panel_data(dssdev);
  95
  96         mutex_lock(&ddata->hpd_lock);
  97         ddata->hpd_cb = cb;
  98         ddata->hpd_cb_data = cb_data;
  99         mutex_unlock(&ddata->hpd_lock);
 100 }
 101
 102 static void hdmic_unregister_hpd_cb(struct omap_dss_device *dssdev)
 103 {
 104         struct panel_drv_data *ddata = to_panel_data(dssdev);
 105
 106         mutex_lock(&ddata->hpd_lock);
 107         ddata->hpd_cb = NULL;
 108         ddata->hpd_cb_data = NULL;
 109         mutex_unlock(&ddata->hpd_lock);
 110 }
 111
 112 static const struct omap_dss_device_ops hdmic_ops = {
 113         .connect                = hdmic_connect,
 114         .disconnect             = hdmic_disconnect,
 115
 116         .enable                 = hdmic_enable,
 117         .disable                = hdmic_disable,
 118
 119         .detect                 = hdmic_detect,
 120         .register_hpd_cb        = hdmic_register_hpd_cb,
 121         .unregister_hpd_cb      = hdmic_unregister_hpd_cb,
 122 };
 123
 124 static irqreturn_t hdmic_hpd_isr(int irq, void *data)
 125 {
 126         struct panel_drv_data *ddata = data;
 127
 128         mutex_lock(&ddata->hpd_lock);
 129         if (ddata->hpd_cb) {
 130                 enum drm_connector_status status;
 131
 132                 if (hdmic_detect(&ddata->dssdev))
 133                         status = connector_status_connected;
 134                 else
 135                         status = connector_status_disconnected;
 136
 137                 ddata->hpd_cb(ddata->hpd_cb_data, status);
 138         }
 139         mutex_unlock(&ddata->hpd_lock);
 140
 141         return IRQ_HANDLED;
 142 }
 143
 144 static int hdmic_probe(struct platform_device *pdev)
 145 {
 146         struct panel_drv_data *ddata;
 147         struct omap_dss_device *dssdev;
 148         struct gpio_desc *gpio;
 149         int r;
 150
 151         ddata = devm_kzalloc(&pdev->dev, sizeof(*ddata), GFP_KERNEL);
 152         if (!ddata)
 153                 return -ENOMEM;
 154
 155         platform_set_drvdata(pdev, ddata);
 156         ddata->dev = &pdev->dev;
 157
 158         mutex_init(&ddata->hpd_lock);
 159
 160         /* HPD GPIO */
 161         gpio = devm_gpiod_get_optional(&pdev->dev, "hpd", GPIOD_IN);
 162         if (IS_ERR(gpio)) {
 163                 dev_err(&pdev->dev, "failed to parse HPD gpio\n");
 164                 return PTR_ERR(gpio);
 165         }
 166
 167         ddata->hpd_gpio = gpio;
 168
 169         if (ddata->hpd_gpio) {
 170                 r = devm_request_threaded_irq(&pdev->dev,
 171                                 gpiod_to_irq(ddata->hpd_gpio),
 172                                 NULL, hdmic_hpd_isr,
 173                                 IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING |
 174                                 IRQF_ONESHOT,
 175                                 "hdmic hpd", ddata);
 176                 if (r)
 177                         return r;
 178         }
 179
 180         dssdev = &ddata->dssdev;
 181         dssdev->ops = &hdmic_ops;
 182         dssdev->dev = &pdev->dev;
 183         dssdev->type = OMAP_DISPLAY_TYPE_HDMI;
 184         dssdev->owner = THIS_MODULE;
 185         dssdev->of_ports = BIT(0);
 186         dssdev->ops_flags = ddata->hpd_gpio
 187                           ? OMAP_DSS_DEVICE_OP_DETECT | OMAP_DSS_DEVICE_OP_HPD
 188                           : 0;
 189
 190         omapdss_display_init(dssdev);
 191         omapdss_device_register(dssdev);
 192
 193         return 0;
 194 }
 195
 196 static int __exit hdmic_remove(struct platform_device *pdev)
 197 {
 198         struct panel_drv_data *ddata = platform_get_drvdata(pdev);
 199         struct omap_dss_device *dssdev = &ddata->dssdev;
 200
 201         omapdss_device_unregister(&ddata->dssdev);
 202
 203         hdmic_disable(dssdev);
 204
 205         return 0;
 206 }
 207
 208 static const struct of_device_id hdmic_of_match[] = {
 209         { .compatible = "omapdss,hdmi-connector", },
 210         {},
 211 };
 212
 213 MODULE_DEVICE_TABLE(of, hdmic_of_match);
 214
 215 static struct platform_driver hdmi_connector_driver = {
 216         .probe  = hdmic_probe,
 217         .remove = __exit_p(hdmic_remove),
 218         .driver = {
 219                 .name   = "connector-hdmi",
 220                 .of_match_table = hdmic_of_match,
 221                 .suppress_bind_attrs = true,
 222         },
 223 };
 224
 225 module_platform_driver(hdmi_connector_driver);
 226
 227 MODULE_AUTHOR("Tomi Valkeinen <tomi.valkeinen@ti.com>");
 228 MODULE_DESCRIPTION("HDMI Connector driver");
 229 MODULE_LICENSE("GPL");