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 bool tpd_detect(struct omap_dss_device *dssdev)
  66 {
  67         struct panel_drv_data *ddata = to_panel_data(dssdev);
  68
  69         return gpiod_get_value_cansleep(ddata->hpd_gpio);
  70 }
  71
  72 static void tpd_register_hpd_cb(struct omap_dss_device *dssdev,
  73                                 void (*cb)(void *cb_data,
  74                                           enum drm_connector_status status),
  75                                 void *cb_data)
  76 {
  77         struct panel_drv_data *ddata = to_panel_data(dssdev);
  78
  79         mutex_lock(&ddata->hpd_lock);
  80         ddata->hpd_cb = cb;
  81         ddata->hpd_cb_data = cb_data;
  82         mutex_unlock(&ddata->hpd_lock);
  83 }
  84
  85 static void tpd_unregister_hpd_cb(struct omap_dss_device *dssdev)
  86 {
  87         struct panel_drv_data *ddata = to_panel_data(dssdev);
  88
  89         mutex_lock(&ddata->hpd_lock);
  90         ddata->hpd_cb = NULL;
  91         ddata->hpd_cb_data = NULL;
  92         mutex_unlock(&ddata->hpd_lock);
  93 }
  94
  95 static const struct omap_dss_device_ops tpd_ops = {
  96         .connect                = tpd_connect,
  97         .disconnect             = tpd_disconnect,
  98         .detect                 = tpd_detect,
  99         .register_hpd_cb        = tpd_register_hpd_cb,
 100         .unregister_hpd_cb      = tpd_unregister_hpd_cb,
 101 };
 102
 103 static irqreturn_t tpd_hpd_isr(int irq, void *data)
 104 {
 105         struct panel_drv_data *ddata = data;
 106
 107         mutex_lock(&ddata->hpd_lock);
 108         if (ddata->hpd_cb) {
 109                 enum drm_connector_status status;
 110
 111                 if (tpd_detect(&ddata->dssdev))
 112                         status = connector_status_connected;
 113                 else
 114                         status = connector_status_disconnected;
 115
 116                 ddata->hpd_cb(ddata->hpd_cb_data, status);
 117         }
 118         mutex_unlock(&ddata->hpd_lock);
 119
 120         return IRQ_HANDLED;
 121 }
 122
 123 static int tpd_probe(struct platform_device *pdev)
 124 {
 125         struct omap_dss_device *dssdev;
 126         struct panel_drv_data *ddata;
 127         int r;
 128         struct gpio_desc *gpio;
 129
 130         ddata = devm_kzalloc(&pdev->dev, sizeof(*ddata), GFP_KERNEL);
 131         if (!ddata)
 132                 return -ENOMEM;
 133
 134         platform_set_drvdata(pdev, ddata);
 135
 136         gpio = devm_gpiod_get_index_optional(&pdev->dev, NULL, 0,
 137                  GPIOD_OUT_LOW);
 138         if (IS_ERR(gpio))
 139                 return PTR_ERR(gpio);
 140
 141         ddata->ct_cp_hpd_gpio = gpio;
 142
 143         gpio = devm_gpiod_get_index_optional(&pdev->dev, NULL, 1,
 144                  GPIOD_OUT_LOW);
 145         if (IS_ERR(gpio))
 146                 return PTR_ERR(gpio);
 147
 148         ddata->ls_oe_gpio = gpio;
 149
 150         gpio = devm_gpiod_get_index(&pdev->dev, NULL, 2,
 151                 GPIOD_IN);
 152         if (IS_ERR(gpio))
 153                 return PTR_ERR(gpio);
 154
 155         ddata->hpd_gpio = gpio;
 156
 157         mutex_init(&ddata->hpd_lock);
 158
 159         r = devm_request_threaded_irq(&pdev->dev, gpiod_to_irq(ddata->hpd_gpio),
 160                 NULL, tpd_hpd_isr,
 161                 IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING | IRQF_ONESHOT,
 162                 "tpd12s015 hpd", ddata);
 163         if (r)
 164                 return r;
 165
 166         dssdev = &ddata->dssdev;
 167         dssdev->ops = &tpd_ops;
 168         dssdev->dev = &pdev->dev;
 169         dssdev->type = OMAP_DISPLAY_TYPE_HDMI;
 170         dssdev->owner = THIS_MODULE;
 171         dssdev->of_ports = BIT(1) | BIT(0);
 172         dssdev->ops_flags = OMAP_DSS_DEVICE_OP_DETECT
 173                           | OMAP_DSS_DEVICE_OP_HPD;
 174
 175         dssdev->next = omapdss_of_find_connected_device(pdev->dev.of_node, 1);
 176         if (IS_ERR(dssdev->next)) {
 177                 if (PTR_ERR(dssdev->next) != -EPROBE_DEFER)
 178                         dev_err(&pdev->dev, "failed to find video sink\n");
 179                 return PTR_ERR(dssdev->next);
 180         }
 181
 182         omapdss_device_register(dssdev);
 183
 184         return 0;
 185 }
 186
 187 static int __exit tpd_remove(struct platform_device *pdev)
 188 {
 189         struct panel_drv_data *ddata = platform_get_drvdata(pdev);
 190         struct omap_dss_device *dssdev = &ddata->dssdev;
 191
 192         if (dssdev->next)
 193                 omapdss_device_put(dssdev->next);
 194         omapdss_device_unregister(&ddata->dssdev);
 195
 196         return 0;
 197 }
 198
 199 static const struct of_device_id tpd_of_match[] = {
 200         { .compatible = "omapdss,ti,tpd12s015", },
 201         {},
 202 };
 203
 204 MODULE_DEVICE_TABLE(of, tpd_of_match);
 205
 206 static struct platform_driver tpd_driver = {
 207         .probe  = tpd_probe,
 208         .remove = __exit_p(tpd_remove),
 209         .driver = {
 210                 .name   = "tpd12s015",
 211                 .of_match_table = tpd_of_match,
 212                 .suppress_bind_attrs = true,
 213         },
 214 };
 215
 216 module_platform_driver(tpd_driver);
 217
 218 MODULE_AUTHOR("Tomi Valkeinen <tomi.valkeinen@ti.com>");
 219 MODULE_DESCRIPTION("TPD12S015 driver");
 220 MODULE_LICENSE("GPL");