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 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/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 #include <linux/mutex.h>
  19
  20 #include "../dss/omapdss.h"
  21
  22 struct panel_drv_data {
  23         struct omap_dss_device dssdev;
  24         void (*hpd_cb)(void *cb_data, enum drm_connector_status status);
  25         void *hpd_cb_data;
  26         struct mutex hpd_lock;
  27
  28         struct gpio_desc *ct_cp_hpd_gpio;
  29         struct gpio_desc *ls_oe_gpio;
  30         struct gpio_desc *hpd_gpio;
  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 *src,
  36                        struct omap_dss_device *dst)
  37 {
  38         struct panel_drv_data *ddata = to_panel_data(dst);
  39         int r;
  40
  41         r = omapdss_device_connect(dst->dss, dst, dst->next);
  42         if (r)
  43                 return r;
  44
  45         gpiod_set_value_cansleep(ddata->ct_cp_hpd_gpio, 1);
  46         gpiod_set_value_cansleep(ddata->ls_oe_gpio, 1);
  47
  48         /* DC-DC converter needs at max 300us to get to 90% of 5V */
  49         udelay(300);
  50
  51         return 0;
  52 }
  53
  54 static void tpd_disconnect(struct omap_dss_device *src,
  55                            struct omap_dss_device *dst)
  56 {
  57         struct panel_drv_data *ddata = to_panel_data(dst);
  58
  59         gpiod_set_value_cansleep(ddata->ct_cp_hpd_gpio, 0);
  60         gpiod_set_value_cansleep(ddata->ls_oe_gpio, 0);
  61
  62         omapdss_device_disconnect(dst, dst->next);
  63 }
  64
  65 static int tpd_enable(struct omap_dss_device *dssdev)
  66 {
  67         struct omap_dss_device *src = dssdev->src;
  68         int r;
  69
  70         if (dssdev->state == OMAP_DSS_DISPLAY_ACTIVE)
  71                 return 0;
  72
  73         r = src->ops->enable(src);
  74         if (r)
  75                 return r;
  76
  77         dssdev->state = OMAP_DSS_DISPLAY_ACTIVE;
  78
  79         return r;
  80 }
  81
  82 static void tpd_disable(struct omap_dss_device *dssdev)
  83 {
  84         struct omap_dss_device *src = dssdev->src;
  85
  86         if (dssdev->state != OMAP_DSS_DISPLAY_ACTIVE)
  87                 return;
  88
  89         src->ops->disable(src);
  90
  91         dssdev->state = OMAP_DSS_DISPLAY_DISABLED;
  92 }
  93
  94 static bool tpd_detect(struct omap_dss_device *dssdev)
  95 {
  96         struct panel_drv_data *ddata = to_panel_data(dssdev);
  97
  98         return gpiod_get_value_cansleep(ddata->hpd_gpio);
  99 }
 100
 101 static void tpd_register_hpd_cb(struct omap_dss_device *dssdev,
 102                                 void (*cb)(void *cb_data,
 103                                           enum drm_connector_status status),
 104                                 void *cb_data)
 105 {
 106         struct panel_drv_data *ddata = to_panel_data(dssdev);
 107
 108         mutex_lock(&ddata->hpd_lock);
 109         ddata->hpd_cb = cb;
 110         ddata->hpd_cb_data = cb_data;
 111         mutex_unlock(&ddata->hpd_lock);
 112 }
 113
 114 static void tpd_unregister_hpd_cb(struct omap_dss_device *dssdev)
 115 {
 116         struct panel_drv_data *ddata = to_panel_data(dssdev);
 117
 118         mutex_lock(&ddata->hpd_lock);
 119         ddata->hpd_cb = NULL;
 120         ddata->hpd_cb_data = NULL;
 121         mutex_unlock(&ddata->hpd_lock);
 122 }
 123
 124 static const struct omap_dss_device_ops tpd_ops = {
 125         .connect                = tpd_connect,
 126         .disconnect             = tpd_disconnect,
 127         .enable                 = tpd_enable,
 128         .disable                = tpd_disable,
 129         .detect                 = tpd_detect,
 130         .register_hpd_cb        = tpd_register_hpd_cb,
 131         .unregister_hpd_cb      = tpd_unregister_hpd_cb,
 132 };
 133
 134 static irqreturn_t tpd_hpd_isr(int irq, void *data)
 135 {
 136         struct panel_drv_data *ddata = data;
 137
 138         mutex_lock(&ddata->hpd_lock);
 139         if (ddata->hpd_cb) {
 140                 enum drm_connector_status status;
 141
 142                 if (tpd_detect(&ddata->dssdev))
 143                         status = connector_status_connected;
 144                 else
 145                         status = connector_status_disconnected;
 146
 147                 ddata->hpd_cb(ddata->hpd_cb_data, status);
 148         }
 149         mutex_unlock(&ddata->hpd_lock);
 150
 151         return IRQ_HANDLED;
 152 }
 153
 154 static int tpd_probe(struct platform_device *pdev)
 155 {
 156         struct omap_dss_device *dssdev;
 157         struct panel_drv_data *ddata;
 158         int r;
 159         struct gpio_desc *gpio;
 160
 161         ddata = devm_kzalloc(&pdev->dev, sizeof(*ddata), GFP_KERNEL);
 162         if (!ddata)
 163                 return -ENOMEM;
 164
 165         platform_set_drvdata(pdev, ddata);
 166
 167         gpio = devm_gpiod_get_index_optional(&pdev->dev, NULL, 0,
 168                  GPIOD_OUT_LOW);
 169         if (IS_ERR(gpio))
 170                 return PTR_ERR(gpio);
 171
 172         ddata->ct_cp_hpd_gpio = gpio;
 173
 174         gpio = devm_gpiod_get_index_optional(&pdev->dev, NULL, 1,
 175                  GPIOD_OUT_LOW);
 176         if (IS_ERR(gpio))
 177                 return PTR_ERR(gpio);
 178
 179         ddata->ls_oe_gpio = gpio;
 180
 181         gpio = devm_gpiod_get_index(&pdev->dev, NULL, 2,
 182                 GPIOD_IN);
 183         if (IS_ERR(gpio))
 184                 return PTR_ERR(gpio);
 185
 186         ddata->hpd_gpio = gpio;
 187
 188         mutex_init(&ddata->hpd_lock);
 189
 190         r = devm_request_threaded_irq(&pdev->dev, gpiod_to_irq(ddata->hpd_gpio),
 191                 NULL, tpd_hpd_isr,
 192                 IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING | IRQF_ONESHOT,
 193                 "tpd12s015 hpd", ddata);
 194         if (r)
 195                 return r;
 196
 197         dssdev = &ddata->dssdev;
 198         dssdev->ops = &tpd_ops;
 199         dssdev->dev = &pdev->dev;
 200         dssdev->type = OMAP_DISPLAY_TYPE_HDMI;
 201         dssdev->output_type = OMAP_DISPLAY_TYPE_HDMI;
 202         dssdev->owner = THIS_MODULE;
 203         dssdev->of_ports = BIT(1) | BIT(0);
 204         dssdev->ops_flags = OMAP_DSS_DEVICE_OP_DETECT
 205                           | OMAP_DSS_DEVICE_OP_HPD;
 206
 207         dssdev->next = omapdss_of_find_connected_device(pdev->dev.of_node, 1);
 208         if (IS_ERR(dssdev->next)) {
 209                 if (PTR_ERR(dssdev->next) != -EPROBE_DEFER)
 210                         dev_err(&pdev->dev, "failed to find video sink\n");
 211                 return PTR_ERR(dssdev->next);
 212         }
 213
 214         omapdss_device_register(dssdev);
 215
 216         return 0;
 217 }
 218
 219 static int __exit tpd_remove(struct platform_device *pdev)
 220 {
 221         struct panel_drv_data *ddata = platform_get_drvdata(pdev);
 222         struct omap_dss_device *dssdev = &ddata->dssdev;
 223
 224         if (dssdev->next)
 225                 omapdss_device_put(dssdev->next);
 226         omapdss_device_unregister(&ddata->dssdev);
 227
 228         WARN_ON(omapdss_device_is_enabled(dssdev));
 229         if (omapdss_device_is_enabled(dssdev))
 230                 tpd_disable(dssdev);
 231
 232         WARN_ON(omapdss_device_is_connected(dssdev));
 233         if (omapdss_device_is_connected(dssdev))
 234                 omapdss_device_disconnect(NULL, dssdev);
 235
 236         return 0;
 237 }
 238
 239 static const struct of_device_id tpd_of_match[] = {
 240         { .compatible = "omapdss,ti,tpd12s015", },
 241         {},
 242 };
 243
 244 MODULE_DEVICE_TABLE(of, tpd_of_match);
 245
 246 static struct platform_driver tpd_driver = {
 247         .probe  = tpd_probe,
 248         .remove = __exit_p(tpd_remove),
 249         .driver = {
 250                 .name   = "tpd12s015",
 251                 .of_match_table = tpd_of_match,
 252                 .suppress_bind_attrs = true,
 253         },
 254 };
 255
 256 module_platform_driver(tpd_driver);
 257
 258 MODULE_AUTHOR("Tomi Valkeinen <tomi.valkeinen@ti.com>");
 259 MODULE_DESCRIPTION("TPD12S015 driver");
 260 MODULE_LICENSE("GPL");