drivers/gpu/drm/bridge/ti-tpd12s015.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  * TPD12S015 HDMI ESD protection & level shifter chip driver
   4  *
   5  * Copyright (C) 2019 Texas Instruments Incorporated
   6  *
   7  * Based on the omapdrm-specific encoder-opa362 driver
   8  *
   9  * Copyright (C) 2013 Texas Instruments Incorporated
  10  * Author: Tomi Valkeinen <tomi.valkeinen@ti.com>
  11  */
  12
  13 #include <linux/delay.h>
  14 #include <linux/gpio/consumer.h>
  15 #include <linux/interrupt.h>
  16 #include <linux/module.h>
  17 #include <linux/mutex.h>
  18 #include <linux/of.h>
  19 #include <linux/of_graph.h>
  20 #include <linux/platform_device.h>
  21
  22 #include <drm/drm_bridge.h>
  23
  24 struct tpd12s015_device {
  25         struct drm_bridge bridge;
  26
  27         struct gpio_desc *ct_cp_hpd_gpio;
  28         struct gpio_desc *ls_oe_gpio;
  29         struct gpio_desc *hpd_gpio;
  30         int hpd_irq;
  31
  32         struct drm_bridge *next_bridge;
  33 };
  34
  35 static inline struct tpd12s015_device *to_tpd12s015(struct drm_bridge *bridge)
  36 {
  37         return container_of(bridge, struct tpd12s015_device, bridge);
  38 }
  39
  40 static int tpd12s015_attach(struct drm_bridge *bridge,
  41                             enum drm_bridge_attach_flags flags)
  42 {
  43         struct tpd12s015_device *tpd = to_tpd12s015(bridge);
  44         int ret;
  45
  46         if (!(flags & DRM_BRIDGE_ATTACH_NO_CONNECTOR))
  47                 return -EINVAL;
  48
  49         ret = drm_bridge_attach(bridge->encoder, tpd->next_bridge,
  50                                 bridge, flags);
  51         if (ret < 0)
  52                 return ret;
  53
  54         gpiod_set_value_cansleep(tpd->ls_oe_gpio, 1);
  55
  56         /* DC-DC converter needs at max 300us to get to 90% of 5V. */
  57         usleep_range(300, 1000);
  58
  59         return 0;
  60 }
  61
  62 static void tpd12s015_detach(struct drm_bridge *bridge)
  63 {
  64         struct tpd12s015_device *tpd = to_tpd12s015(bridge);
  65
  66         gpiod_set_value_cansleep(tpd->ls_oe_gpio, 0);
  67 }
  68
  69 static enum drm_connector_status tpd12s015_detect(struct drm_bridge *bridge)
  70 {
  71         struct tpd12s015_device *tpd = to_tpd12s015(bridge);
  72
  73         if (gpiod_get_value_cansleep(tpd->hpd_gpio))
  74                 return connector_status_connected;
  75         else
  76                 return connector_status_disconnected;
  77 }
  78
  79 static void tpd12s015_hpd_enable(struct drm_bridge *bridge)
  80 {
  81         struct tpd12s015_device *tpd = to_tpd12s015(bridge);
  82
  83         gpiod_set_value_cansleep(tpd->ct_cp_hpd_gpio, 1);
  84 }
  85
  86 static void tpd12s015_hpd_disable(struct drm_bridge *bridge)
  87 {
  88         struct tpd12s015_device *tpd = to_tpd12s015(bridge);
  89
  90         gpiod_set_value_cansleep(tpd->ct_cp_hpd_gpio, 0);
  91 }
  92
  93 static const struct drm_bridge_funcs tpd12s015_bridge_funcs = {
  94         .attach                 = tpd12s015_attach,
  95         .detach                 = tpd12s015_detach,
  96         .detect                 = tpd12s015_detect,
  97         .hpd_enable             = tpd12s015_hpd_enable,
  98         .hpd_disable            = tpd12s015_hpd_disable,
  99 };
 100
 101 static irqreturn_t tpd12s015_hpd_isr(int irq, void *data)
 102 {
 103         struct tpd12s015_device *tpd = data;
 104         struct drm_bridge *bridge = &tpd->bridge;
 105
 106         drm_bridge_hpd_notify(bridge, tpd12s015_detect(bridge));
 107
 108         return IRQ_HANDLED;
 109 }
 110
 111 static int tpd12s015_probe(struct platform_device *pdev)
 112 {
 113         struct tpd12s015_device *tpd;
 114         struct device_node *node;
 115         struct gpio_desc *gpio;
 116         int ret;
 117
 118         tpd = devm_kzalloc(&pdev->dev, sizeof(*tpd), GFP_KERNEL);
 119         if (!tpd)
 120                 return -ENOMEM;
 121
 122         platform_set_drvdata(pdev, tpd);
 123
 124         tpd->bridge.funcs = &tpd12s015_bridge_funcs;
 125         tpd->bridge.of_node = pdev->dev.of_node;
 126         tpd->bridge.type = DRM_MODE_CONNECTOR_HDMIA;
 127         tpd->bridge.ops = DRM_BRIDGE_OP_DETECT;
 128
 129         /* Get the next bridge, connected to port@1. */
 130         node = of_graph_get_remote_node(pdev->dev.of_node, 1, -1);
 131         if (!node)
 132                 return -ENODEV;
 133
 134         tpd->next_bridge = of_drm_find_bridge(node);
 135         of_node_put(node);
 136
 137         if (!tpd->next_bridge)
 138                 return -EPROBE_DEFER;
 139
 140         /* Get the control and HPD GPIOs. */
 141         gpio = devm_gpiod_get_index_optional(&pdev->dev, NULL, 0,
 142                                              GPIOD_OUT_LOW);
 143         if (IS_ERR(gpio))
 144                 return PTR_ERR(gpio);
 145
 146         tpd->ct_cp_hpd_gpio = gpio;
 147
 148         gpio = devm_gpiod_get_index_optional(&pdev->dev, NULL, 1,
 149                                              GPIOD_OUT_LOW);
 150         if (IS_ERR(gpio))
 151                 return PTR_ERR(gpio);
 152
 153         tpd->ls_oe_gpio = gpio;
 154
 155         gpio = devm_gpiod_get_index(&pdev->dev, NULL, 2, GPIOD_IN);
 156         if (IS_ERR(gpio))
 157                 return PTR_ERR(gpio);
 158
 159         tpd->hpd_gpio = gpio;
 160
 161         /* Register the IRQ if the HPD GPIO is IRQ-capable. */
 162         tpd->hpd_irq = gpiod_to_irq(tpd->hpd_gpio);
 163         if (tpd->hpd_irq >= 0) {
 164                 ret = devm_request_threaded_irq(&pdev->dev, tpd->hpd_irq, NULL,
 165                                                 tpd12s015_hpd_isr,
 166                                                 IRQF_TRIGGER_RISING |
 167                                                 IRQF_TRIGGER_FALLING |
 168                                                 IRQF_ONESHOT,
 169                                                 "tpd12s015 hpd", tpd);
 170                 if (ret)
 171                         return ret;
 172
 173                 tpd->bridge.ops |= DRM_BRIDGE_OP_HPD;
 174         }
 175
 176         /* Register the DRM bridge. */
 177         drm_bridge_add(&tpd->bridge);
 178
 179         return 0;
 180 }
 181
 182 static int tpd12s015_remove(struct platform_device *pdev)
 183 {
 184         struct tpd12s015_device *tpd = platform_get_drvdata(pdev);
 185
 186         drm_bridge_remove(&tpd->bridge);
 187
 188         return 0;
 189 }
 190
 191 static const struct of_device_id tpd12s015_of_match[] = {
 192         { .compatible = "ti,tpd12s015", },
 193         {},
 194 };
 195
 196 MODULE_DEVICE_TABLE(of, tpd12s015_of_match);
 197
 198 static struct platform_driver tpd12s015_driver = {
 199         .probe  = tpd12s015_probe,
 200         .remove = tpd12s015_remove,
 201         .driver = {
 202                 .name   = "tpd12s015",
 203                 .of_match_table = tpd12s015_of_match,
 204         },
 205 };
 206
 207 module_platform_driver(tpd12s015_driver);
 208
 209 MODULE_AUTHOR("Tomi Valkeinen <tomi.valkeinen@ti.com>");
 210 MODULE_DESCRIPTION("TPD12S015 HDMI level shifter and ESD protection driver");
 211 MODULE_LICENSE("GPL");