Commit cff5e6f7 authored by Laurent Pinchart's avatar Laurent Pinchart Committed by Tomi Valkeinen
Browse files

drm/bridge: Add driver for the TI TPD12S015 HDMI level shifter 



The TI TPD12S015 is an HDMI level shifter and ESD protector controlled
through GPIOs. Add a DRM bridge driver for the device.

Signed-off-by: default avatarLaurent Pinchart <laurent.pinchart@ideasonboard.com>
Reviewed-by: default avatarTomi Valkeinen <tomi.valkeinen@ti.com>
Acked-by: default avatarSam Ravnborg <sam@ravnborg.org>
Tested-by: default avatarSebastian Reichel <sebastian.reichel@collabora.com>
Reviewed-by: default avatarSebastian Reichel <sebastian.reichel@collabora.com>
Signed-off-by: default avatarTomi Valkeinen <tomi.valkeinen@ti.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20200226112514.12455-17-laurent.pinchart@ideasonboard.com
parent 0c275c30

drivers/gpu/drm/bridge/Kconfig

+8 −0
Original line number Diff line number Diff line
@@ -172,6 +172,14 @@ config DRM_TI_SN65DSI86 
	help

	  Texas Instruments SN65DSI86 DSI to eDP Bridge driver



config DRM_TI_TPD12S015

	tristate "TI TPD12S015 HDMI level shifter and ESD protection"

	depends on OF

	select DRM_KMS_HELPER

	help

	  Texas Instruments TPD12S015 HDMI level shifter and ESD protection

	  driver.



source "drivers/gpu/drm/bridge/analogix/Kconfig"



source "drivers/gpu/drm/bridge/adv7511/Kconfig"

drivers/gpu/drm/bridge/Makefile

+1 −0
Original line number Diff line number Diff line
@@ -17,6 +17,7 @@ obj-$(CONFIG_DRM_TOSHIBA_TC358768) += tc358768.o 
obj-$(CONFIG_DRM_I2C_ADV7511) += adv7511/

obj-$(CONFIG_DRM_TI_SN65DSI86) += ti-sn65dsi86.o

obj-$(CONFIG_DRM_TI_TFP410) += ti-tfp410.o

obj-$(CONFIG_DRM_TI_TPD12S015) += ti-tpd12s015.o



obj-y += analogix/

obj-y += synopsys/

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

0 → 100644
+211 −0
Original line number Diff line number Diff line 
// 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) {

		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 __exit 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	= __exit_p(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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