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d2912cb15b
Based on 2 normalized pattern(s): this program is free software you can redistribute it and or modify it under the terms of the gnu general public license version 2 as published by the free software foundation this program is free software you can redistribute it and or modify it under the terms of the gnu general public license version 2 as published by the free software foundation # extracted by the scancode license scanner the SPDX license identifier GPL-2.0-only has been chosen to replace the boilerplate/reference in 4122 file(s). Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Reviewed-by: Enrico Weigelt <info@metux.net> Reviewed-by: Kate Stewart <kstewart@linuxfoundation.org> Reviewed-by: Allison Randal <allison@lohutok.net> Cc: linux-spdx@vger.kernel.org Link: https://lkml.kernel.org/r/20190604081206.933168790@linutronix.de Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
218 lines
5.1 KiB
C
218 lines
5.1 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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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) 2013 Texas Instruments Incorporated - http://www.ti.com/
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* Author: Tomi Valkeinen <tomi.valkeinen@ti.com>
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*/
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#include <linux/completion.h>
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#include <linux/delay.h>
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#include <linux/module.h>
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#include <linux/slab.h>
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#include <linux/platform_device.h>
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#include <linux/gpio/consumer.h>
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#include <linux/mutex.h>
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#include "../dss/omapdss.h"
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struct panel_drv_data {
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struct omap_dss_device dssdev;
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void (*hpd_cb)(void *cb_data, enum drm_connector_status status);
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void *hpd_cb_data;
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struct mutex hpd_lock;
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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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};
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#define to_panel_data(x) container_of(x, struct panel_drv_data, dssdev)
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static int tpd_connect(struct omap_dss_device *src,
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struct omap_dss_device *dst)
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{
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struct panel_drv_data *ddata = to_panel_data(dst);
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int r;
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r = omapdss_device_connect(dst->dss, dst, dst->next);
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if (r)
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return r;
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gpiod_set_value_cansleep(ddata->ct_cp_hpd_gpio, 1);
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gpiod_set_value_cansleep(ddata->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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udelay(300);
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return 0;
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}
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static void tpd_disconnect(struct omap_dss_device *src,
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struct omap_dss_device *dst)
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{
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struct panel_drv_data *ddata = to_panel_data(dst);
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gpiod_set_value_cansleep(ddata->ct_cp_hpd_gpio, 0);
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gpiod_set_value_cansleep(ddata->ls_oe_gpio, 0);
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omapdss_device_disconnect(dst, dst->next);
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}
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static bool tpd_detect(struct omap_dss_device *dssdev)
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{
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struct panel_drv_data *ddata = to_panel_data(dssdev);
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return gpiod_get_value_cansleep(ddata->hpd_gpio);
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}
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static void tpd_register_hpd_cb(struct omap_dss_device *dssdev,
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void (*cb)(void *cb_data,
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enum drm_connector_status status),
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void *cb_data)
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{
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struct panel_drv_data *ddata = to_panel_data(dssdev);
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mutex_lock(&ddata->hpd_lock);
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ddata->hpd_cb = cb;
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ddata->hpd_cb_data = cb_data;
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mutex_unlock(&ddata->hpd_lock);
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}
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static void tpd_unregister_hpd_cb(struct omap_dss_device *dssdev)
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{
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struct panel_drv_data *ddata = to_panel_data(dssdev);
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mutex_lock(&ddata->hpd_lock);
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ddata->hpd_cb = NULL;
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ddata->hpd_cb_data = NULL;
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mutex_unlock(&ddata->hpd_lock);
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}
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static const struct omap_dss_device_ops tpd_ops = {
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.connect = tpd_connect,
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.disconnect = tpd_disconnect,
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.detect = tpd_detect,
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.register_hpd_cb = tpd_register_hpd_cb,
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.unregister_hpd_cb = tpd_unregister_hpd_cb,
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};
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static irqreturn_t tpd_hpd_isr(int irq, void *data)
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{
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struct panel_drv_data *ddata = data;
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mutex_lock(&ddata->hpd_lock);
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if (ddata->hpd_cb) {
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enum drm_connector_status status;
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if (tpd_detect(&ddata->dssdev))
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status = connector_status_connected;
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else
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status = connector_status_disconnected;
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ddata->hpd_cb(ddata->hpd_cb_data, status);
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}
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mutex_unlock(&ddata->hpd_lock);
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return IRQ_HANDLED;
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}
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static int tpd_probe(struct platform_device *pdev)
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{
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struct omap_dss_device *dssdev;
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struct panel_drv_data *ddata;
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int r;
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struct gpio_desc *gpio;
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ddata = devm_kzalloc(&pdev->dev, sizeof(*ddata), GFP_KERNEL);
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if (!ddata)
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return -ENOMEM;
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platform_set_drvdata(pdev, ddata);
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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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ddata->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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ddata->ls_oe_gpio = gpio;
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gpio = devm_gpiod_get_index(&pdev->dev, NULL, 2,
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GPIOD_IN);
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if (IS_ERR(gpio))
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return PTR_ERR(gpio);
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ddata->hpd_gpio = gpio;
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mutex_init(&ddata->hpd_lock);
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r = devm_request_threaded_irq(&pdev->dev, gpiod_to_irq(ddata->hpd_gpio),
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NULL, tpd_hpd_isr,
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IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING | IRQF_ONESHOT,
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"tpd12s015 hpd", ddata);
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if (r)
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return r;
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dssdev = &ddata->dssdev;
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dssdev->ops = &tpd_ops;
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dssdev->dev = &pdev->dev;
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dssdev->type = OMAP_DISPLAY_TYPE_HDMI;
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dssdev->owner = THIS_MODULE;
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dssdev->of_ports = BIT(1) | BIT(0);
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dssdev->ops_flags = OMAP_DSS_DEVICE_OP_DETECT
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| OMAP_DSS_DEVICE_OP_HPD;
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dssdev->next = omapdss_of_find_connected_device(pdev->dev.of_node, 1);
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if (IS_ERR(dssdev->next)) {
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if (PTR_ERR(dssdev->next) != -EPROBE_DEFER)
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dev_err(&pdev->dev, "failed to find video sink\n");
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return PTR_ERR(dssdev->next);
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}
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omapdss_device_register(dssdev);
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return 0;
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}
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static int __exit tpd_remove(struct platform_device *pdev)
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{
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struct panel_drv_data *ddata = platform_get_drvdata(pdev);
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struct omap_dss_device *dssdev = &ddata->dssdev;
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if (dssdev->next)
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omapdss_device_put(dssdev->next);
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omapdss_device_unregister(&ddata->dssdev);
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return 0;
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}
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static const struct of_device_id tpd_of_match[] = {
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{ .compatible = "omapdss,ti,tpd12s015", },
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{},
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};
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MODULE_DEVICE_TABLE(of, tpd_of_match);
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static struct platform_driver tpd_driver = {
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.probe = tpd_probe,
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.remove = __exit_p(tpd_remove),
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.driver = {
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.name = "tpd12s015",
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.of_match_table = tpd_of_match,
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.suppress_bind_attrs = true,
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},
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};
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module_platform_driver(tpd_driver);
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MODULE_AUTHOR("Tomi Valkeinen <tomi.valkeinen@ti.com>");
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MODULE_DESCRIPTION("TPD12S015 driver");
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MODULE_LICENSE("GPL");
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