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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: Laurent Pinchart <laurent.pinchart@ideasonboard.com> Reviewed-by: Tomi Valkeinen <tomi.valkeinen@ti.com> Acked-by: Sam Ravnborg <sam@ravnborg.org> Tested-by: Sebastian Reichel <sebastian.reichel@collabora.com> Reviewed-by: Sebastian Reichel <sebastian.reichel@collabora.com> Signed-off-by: Tomi Valkeinen <tomi.valkeinen@ti.com> Link: https://patchwork.freedesktop.org/patch/msgid/20200226112514.12455-17-laurent.pinchart@ideasonboard.com
212 lines
4.9 KiB
C
212 lines
4.9 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* TPD12S015 HDMI ESD protection & level shifter chip driver
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*
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* Copyright (C) 2019 Texas Instruments Incorporated
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*
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* Based on the omapdrm-specific encoder-opa362 driver
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*
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* Copyright (C) 2013 Texas Instruments Incorporated
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* Author: Tomi Valkeinen <tomi.valkeinen@ti.com>
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*/
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#include <linux/delay.h>
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#include <linux/gpio/consumer.h>
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#include <linux/interrupt.h>
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#include <linux/module.h>
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#include <linux/mutex.h>
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#include <linux/of.h>
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#include <linux/of_graph.h>
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#include <linux/platform_device.h>
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#include <drm/drm_bridge.h>
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struct tpd12s015_device {
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struct drm_bridge bridge;
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struct gpio_desc *ct_cp_hpd_gpio;
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struct gpio_desc *ls_oe_gpio;
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struct gpio_desc *hpd_gpio;
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int hpd_irq;
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struct drm_bridge *next_bridge;
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};
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static inline struct tpd12s015_device *to_tpd12s015(struct drm_bridge *bridge)
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{
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return container_of(bridge, struct tpd12s015_device, bridge);
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}
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static int tpd12s015_attach(struct drm_bridge *bridge,
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enum drm_bridge_attach_flags flags)
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{
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struct tpd12s015_device *tpd = to_tpd12s015(bridge);
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int ret;
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if (!(flags & DRM_BRIDGE_ATTACH_NO_CONNECTOR))
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return -EINVAL;
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ret = drm_bridge_attach(bridge->encoder, tpd->next_bridge,
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bridge, flags);
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if (ret < 0)
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return ret;
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gpiod_set_value_cansleep(tpd->ls_oe_gpio, 1);
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/* DC-DC converter needs at max 300us to get to 90% of 5V. */
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usleep_range(300, 1000);
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return 0;
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}
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static void tpd12s015_detach(struct drm_bridge *bridge)
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{
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struct tpd12s015_device *tpd = to_tpd12s015(bridge);
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gpiod_set_value_cansleep(tpd->ls_oe_gpio, 0);
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}
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static enum drm_connector_status tpd12s015_detect(struct drm_bridge *bridge)
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{
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struct tpd12s015_device *tpd = to_tpd12s015(bridge);
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if (gpiod_get_value_cansleep(tpd->hpd_gpio))
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return connector_status_connected;
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else
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return connector_status_disconnected;
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}
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static void tpd12s015_hpd_enable(struct drm_bridge *bridge)
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{
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struct tpd12s015_device *tpd = to_tpd12s015(bridge);
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gpiod_set_value_cansleep(tpd->ct_cp_hpd_gpio, 1);
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}
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static void tpd12s015_hpd_disable(struct drm_bridge *bridge)
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{
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struct tpd12s015_device *tpd = to_tpd12s015(bridge);
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gpiod_set_value_cansleep(tpd->ct_cp_hpd_gpio, 0);
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}
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static const struct drm_bridge_funcs tpd12s015_bridge_funcs = {
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.attach = tpd12s015_attach,
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.detach = tpd12s015_detach,
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.detect = tpd12s015_detect,
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.hpd_enable = tpd12s015_hpd_enable,
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.hpd_disable = tpd12s015_hpd_disable,
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};
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static irqreturn_t tpd12s015_hpd_isr(int irq, void *data)
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{
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struct tpd12s015_device *tpd = data;
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struct drm_bridge *bridge = &tpd->bridge;
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drm_bridge_hpd_notify(bridge, tpd12s015_detect(bridge));
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return IRQ_HANDLED;
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}
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static int tpd12s015_probe(struct platform_device *pdev)
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{
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struct tpd12s015_device *tpd;
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struct device_node *node;
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struct gpio_desc *gpio;
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int ret;
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tpd = devm_kzalloc(&pdev->dev, sizeof(*tpd), GFP_KERNEL);
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if (!tpd)
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return -ENOMEM;
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platform_set_drvdata(pdev, tpd);
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tpd->bridge.funcs = &tpd12s015_bridge_funcs;
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tpd->bridge.of_node = pdev->dev.of_node;
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tpd->bridge.type = DRM_MODE_CONNECTOR_HDMIA;
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tpd->bridge.ops = DRM_BRIDGE_OP_DETECT;
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/* Get the next bridge, connected to port@1. */
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node = of_graph_get_remote_node(pdev->dev.of_node, 1, -1);
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if (!node)
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return -ENODEV;
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tpd->next_bridge = of_drm_find_bridge(node);
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of_node_put(node);
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if (!tpd->next_bridge)
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return -EPROBE_DEFER;
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/* Get the control and HPD GPIOs. */
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gpio = devm_gpiod_get_index_optional(&pdev->dev, NULL, 0,
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GPIOD_OUT_LOW);
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if (IS_ERR(gpio))
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return PTR_ERR(gpio);
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tpd->ct_cp_hpd_gpio = gpio;
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gpio = devm_gpiod_get_index_optional(&pdev->dev, NULL, 1,
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GPIOD_OUT_LOW);
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if (IS_ERR(gpio))
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return PTR_ERR(gpio);
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tpd->ls_oe_gpio = gpio;
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gpio = devm_gpiod_get_index(&pdev->dev, NULL, 2, GPIOD_IN);
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if (IS_ERR(gpio))
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return PTR_ERR(gpio);
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tpd->hpd_gpio = gpio;
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/* Register the IRQ if the HPD GPIO is IRQ-capable. */
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tpd->hpd_irq = gpiod_to_irq(tpd->hpd_gpio);
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if (tpd->hpd_irq) {
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ret = devm_request_threaded_irq(&pdev->dev, tpd->hpd_irq, NULL,
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tpd12s015_hpd_isr,
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IRQF_TRIGGER_RISING |
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IRQF_TRIGGER_FALLING |
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IRQF_ONESHOT,
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"tpd12s015 hpd", tpd);
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if (ret)
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return ret;
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tpd->bridge.ops |= DRM_BRIDGE_OP_HPD;
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}
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/* Register the DRM bridge. */
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drm_bridge_add(&tpd->bridge);
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return 0;
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}
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static int __exit tpd12s015_remove(struct platform_device *pdev)
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{
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struct tpd12s015_device *tpd = platform_get_drvdata(pdev);
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drm_bridge_remove(&tpd->bridge);
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return 0;
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}
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static const struct of_device_id tpd12s015_of_match[] = {
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{ .compatible = "ti,tpd12s015", },
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{},
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};
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MODULE_DEVICE_TABLE(of, tpd12s015_of_match);
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static struct platform_driver tpd12s015_driver = {
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.probe = tpd12s015_probe,
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.remove = __exit_p(tpd12s015_remove),
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.driver = {
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.name = "tpd12s015",
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.of_match_table = tpd12s015_of_match,
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},
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};
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module_platform_driver(tpd12s015_driver);
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MODULE_AUTHOR("Tomi Valkeinen <tomi.valkeinen@ti.com>");
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MODULE_DESCRIPTION("TPD12S015 HDMI level shifter and ESD protection driver");
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MODULE_LICENSE("GPL");
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