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// SPDX-License-Identifier: GPL-2.0
/*
* TPD12S015 HDMI ESD protection & level shifter chip driver
*
* Copyright (C) 2019 Texas Instruments Incorporated
*
* Based on the omapdrm-specific encoder-opa362 driver
*
* Copyright (C) 2013 Texas Instruments Incorporated
* Author: Tomi Valkeinen <tomi.valkeinen@ti.com>
*/
#include <linux/delay.h>
#include <linux/gpio/consumer.h>
#include <linux/interrupt.h>
#include <linux/module.h>
#include <linux/mutex.h>
#include <linux/of.h>
#include <linux/of_graph.h>
#include <linux/platform_device.h>
#include <drm/drm_bridge.h>
struct tpd12s015_device {
struct drm_bridge bridge;
struct gpio_desc *ct_cp_hpd_gpio;
struct gpio_desc *ls_oe_gpio;
struct gpio_desc *hpd_gpio;
int hpd_irq;
struct drm_bridge *next_bridge;
};
static inline struct tpd12s015_device *to_tpd12s015(struct drm_bridge *bridge)
{
return container_of(bridge, struct tpd12s015_device, bridge);
}
static int tpd12s015_attach(struct drm_bridge *bridge,
enum drm_bridge_attach_flags flags)
{
struct tpd12s015_device *tpd = to_tpd12s015(bridge);
int ret;
if (!(flags & DRM_BRIDGE_ATTACH_NO_CONNECTOR))
return -EINVAL;
ret = drm_bridge_attach(bridge->encoder, tpd->next_bridge,
bridge, flags);
if (ret < 0)
return ret;
gpiod_set_value_cansleep(tpd->ls_oe_gpio, 1);
/* DC-DC converter needs at max 300us to get to 90% of 5V. */
usleep_range(300, 1000);
return 0;
}
static void tpd12s015_detach(struct drm_bridge *bridge)
{
struct tpd12s015_device *tpd = to_tpd12s015(bridge);
gpiod_set_value_cansleep(tpd->ls_oe_gpio, 0);
}
static enum drm_connector_status tpd12s015_detect(struct drm_bridge *bridge)
{
struct tpd12s015_device *tpd = to_tpd12s015(bridge);
if (gpiod_get_value_cansleep(tpd->hpd_gpio))
return connector_status_connected;
else
return connector_status_disconnected;
}
static void tpd12s015_hpd_enable(struct drm_bridge *bridge)
{
struct tpd12s015_device *tpd = to_tpd12s015(bridge);
gpiod_set_value_cansleep(tpd->ct_cp_hpd_gpio, 1);
}
static void tpd12s015_hpd_disable(struct drm_bridge *bridge)
{
struct tpd12s015_device *tpd = to_tpd12s015(bridge);
gpiod_set_value_cansleep(tpd->ct_cp_hpd_gpio, 0);
}
static const struct drm_bridge_funcs tpd12s015_bridge_funcs = {
.attach = tpd12s015_attach,
.detach = tpd12s015_detach,
.detect = tpd12s015_detect,
.hpd_enable = tpd12s015_hpd_enable,
.hpd_disable = tpd12s015_hpd_disable,
};
static irqreturn_t tpd12s015_hpd_isr(int irq, void *data)
{
struct tpd12s015_device *tpd = data;
struct drm_bridge *bridge = &tpd->bridge;
drm_bridge_hpd_notify(bridge, tpd12s015_detect(bridge));
return IRQ_HANDLED;
}
static int tpd12s015_probe(struct platform_device *pdev)
{
struct tpd12s015_device *tpd;
struct device_node *node;
struct gpio_desc *gpio;
int ret;
tpd = devm_kzalloc(&pdev->dev, sizeof(*tpd), GFP_KERNEL);
if (!tpd)
return -ENOMEM;
platform_set_drvdata(pdev, tpd);
tpd->bridge.funcs = &tpd12s015_bridge_funcs;
tpd->bridge.of_node = pdev->dev.of_node;
tpd->bridge.type = DRM_MODE_CONNECTOR_HDMIA;
tpd->bridge.ops = DRM_BRIDGE_OP_DETECT;
/* Get the next bridge, connected to port@1. */
node = of_graph_get_remote_node(pdev->dev.of_node, 1, -1);
if (!node)
return -ENODEV;
tpd->next_bridge = of_drm_find_bridge(node);
of_node_put(node);
if (!tpd->next_bridge)
return -EPROBE_DEFER;
/* Get the control and HPD GPIOs. */
gpio = devm_gpiod_get_index_optional(&pdev->dev, NULL, 0,
GPIOD_OUT_LOW);
if (IS_ERR(gpio))
return PTR_ERR(gpio);
tpd->ct_cp_hpd_gpio = gpio;
gpio = devm_gpiod_get_index_optional(&pdev->dev, NULL, 1,
GPIOD_OUT_LOW);
if (IS_ERR(gpio))
return PTR_ERR(gpio);
tpd->ls_oe_gpio = gpio;
gpio = devm_gpiod_get_index(&pdev->dev, NULL, 2, GPIOD_IN);
if (IS_ERR(gpio))
return PTR_ERR(gpio);
tpd->hpd_gpio = gpio;
/* Register the IRQ if the HPD GPIO is IRQ-capable. */
tpd->hpd_irq = gpiod_to_irq(tpd->hpd_gpio);
if (tpd->hpd_irq >= 0) {
ret = devm_request_threaded_irq(&pdev->dev, tpd->hpd_irq, NULL,
tpd12s015_hpd_isr,
IRQF_TRIGGER_RISING |
IRQF_TRIGGER_FALLING |
IRQF_ONESHOT,
"tpd12s015 hpd", tpd);
if (ret)
return ret;
tpd->bridge.ops |= DRM_BRIDGE_OP_HPD;
}
/* Register the DRM bridge. */
drm_bridge_add(&tpd->bridge);
return 0;
}
static int tpd12s015_remove(struct platform_device *pdev)
{
struct tpd12s015_device *tpd = platform_get_drvdata(pdev);
drm_bridge_remove(&tpd->bridge);
return 0;
}
static const struct of_device_id tpd12s015_of_match[] = {
{ .compatible = "ti,tpd12s015", },
{},
};
MODULE_DEVICE_TABLE(of, tpd12s015_of_match);
static struct platform_driver tpd12s015_driver = {
.probe = tpd12s015_probe,
.remove = tpd12s015_remove,
.driver = {
.name = "tpd12s015",
.of_match_table = tpd12s015_of_match,
},
};
module_platform_driver(tpd12s015_driver);
MODULE_AUTHOR("Tomi Valkeinen <tomi.valkeinen@ti.com>");
MODULE_DESCRIPTION("TPD12S015 HDMI level shifter and ESD protection driver");
MODULE_LICENSE("GPL");
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