1// SPDX-License-Identifier: GPL-2.0-only
  2/*
  3 * HDMI Connector driver
  4 *
  5 * Copyright (C) 2013 Texas Instruments Incorporated - http://www.ti.com/
  6 * Author: Tomi Valkeinen <tomi.valkeinen@ti.com>
  7 */
  8
  9#include <linux/gpio/consumer.h>
 10#include <linux/module.h>
 11#include <linux/mutex.h>
 12#include <linux/platform_device.h>
 13#include <linux/slab.h>
 14
 15#include "../dss/omapdss.h"
 16
 17struct panel_drv_data {
 18	struct omap_dss_device dssdev;
 19	void (*hpd_cb)(void *cb_data, enum drm_connector_status status);
 20	void *hpd_cb_data;
 21	struct mutex hpd_lock;
 22
 23	struct device *dev;
 24
 25	struct gpio_desc *hpd_gpio;
 26};
 27
 28#define to_panel_data(x) container_of(x, struct panel_drv_data, dssdev)
 29
 30static int hdmic_connect(struct omap_dss_device *src,
 31			 struct omap_dss_device *dst)
 32{
 33	return 0;
 34}
 35
 36static void hdmic_disconnect(struct omap_dss_device *src,
 37			     struct omap_dss_device *dst)
 38{
 39}
 40
 41static bool hdmic_detect(struct omap_dss_device *dssdev)
 42{
 43	struct panel_drv_data *ddata = to_panel_data(dssdev);
 44
 45	return gpiod_get_value_cansleep(ddata->hpd_gpio);
 46}
 47
 48static void hdmic_register_hpd_cb(struct omap_dss_device *dssdev,
 49				  void (*cb)(void *cb_data,
 50					    enum drm_connector_status status),
 51				  void *cb_data)
 52{
 53	struct panel_drv_data *ddata = to_panel_data(dssdev);
 54
 55	mutex_lock(&ddata->hpd_lock);
 56	ddata->hpd_cb = cb;
 57	ddata->hpd_cb_data = cb_data;
 58	mutex_unlock(&ddata->hpd_lock);
 59}
 60
 61static void hdmic_unregister_hpd_cb(struct omap_dss_device *dssdev)
 62{
 63	struct panel_drv_data *ddata = to_panel_data(dssdev);
 64
 65	mutex_lock(&ddata->hpd_lock);
 66	ddata->hpd_cb = NULL;
 67	ddata->hpd_cb_data = NULL;
 68	mutex_unlock(&ddata->hpd_lock);
 69}
 70
 71static const struct omap_dss_device_ops hdmic_ops = {
 72	.connect		= hdmic_connect,
 73	.disconnect		= hdmic_disconnect,
 74
 75	.detect			= hdmic_detect,
 76	.register_hpd_cb	= hdmic_register_hpd_cb,
 77	.unregister_hpd_cb	= hdmic_unregister_hpd_cb,
 78};
 79
 80static irqreturn_t hdmic_hpd_isr(int irq, void *data)
 81{
 82	struct panel_drv_data *ddata = data;
 83
 84	mutex_lock(&ddata->hpd_lock);
 85	if (ddata->hpd_cb) {
 86		enum drm_connector_status status;
 87
 88		if (hdmic_detect(&ddata->dssdev))
 89			status = connector_status_connected;
 90		else
 91			status = connector_status_disconnected;
 92
 93		ddata->hpd_cb(ddata->hpd_cb_data, status);
 94	}
 95	mutex_unlock(&ddata->hpd_lock);
 96
 97	return IRQ_HANDLED;
 98}
 99
100static int hdmic_probe(struct platform_device *pdev)
101{
102	struct panel_drv_data *ddata;
103	struct omap_dss_device *dssdev;
104	struct gpio_desc *gpio;
105	int r;
106
107	ddata = devm_kzalloc(&pdev->dev, sizeof(*ddata), GFP_KERNEL);
108	if (!ddata)
109		return -ENOMEM;
110
111	platform_set_drvdata(pdev, ddata);
112	ddata->dev = &pdev->dev;
113
114	mutex_init(&ddata->hpd_lock);
115
116	/* HPD GPIO */
117	gpio = devm_gpiod_get_optional(&pdev->dev, "hpd", GPIOD_IN);
118	if (IS_ERR(gpio)) {
119		dev_err(&pdev->dev, "failed to parse HPD gpio\n");
120		return PTR_ERR(gpio);
121	}
122
123	ddata->hpd_gpio = gpio;
124
125	if (ddata->hpd_gpio) {
126		r = devm_request_threaded_irq(&pdev->dev,
127				gpiod_to_irq(ddata->hpd_gpio),
128				NULL, hdmic_hpd_isr,
129				IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING |
130				IRQF_ONESHOT,
131				"hdmic hpd", ddata);
132		if (r)
133			return r;
134	}
135
136	dssdev = &ddata->dssdev;
137	dssdev->ops = &hdmic_ops;
138	dssdev->dev = &pdev->dev;
139	dssdev->type = OMAP_DISPLAY_TYPE_HDMI;
140	dssdev->display = true;
141	dssdev->owner = THIS_MODULE;
142	dssdev->of_ports = BIT(0);
143	dssdev->ops_flags = ddata->hpd_gpio
144			  ? OMAP_DSS_DEVICE_OP_DETECT | OMAP_DSS_DEVICE_OP_HPD
145			  : 0;
146
147	omapdss_display_init(dssdev);
148	omapdss_device_register(dssdev);
149
150	return 0;
151}
152
153static int __exit hdmic_remove(struct platform_device *pdev)
154{
155	struct panel_drv_data *ddata = platform_get_drvdata(pdev);
156
157	omapdss_device_unregister(&ddata->dssdev);
158
159	return 0;
160}
161
162static const struct of_device_id hdmic_of_match[] = {
163	{ .compatible = "omapdss,hdmi-connector", },
164	{},
165};
166
167MODULE_DEVICE_TABLE(of, hdmic_of_match);
168
169static struct platform_driver hdmi_connector_driver = {
170	.probe	= hdmic_probe,
171	.remove	= __exit_p(hdmic_remove),
172	.driver	= {
173		.name	= "connector-hdmi",
174		.of_match_table = hdmic_of_match,
175		.suppress_bind_attrs = true,
176	},
177};
178
179module_platform_driver(hdmi_connector_driver);
180
181MODULE_AUTHOR("Tomi Valkeinen <tomi.valkeinen@ti.com>");
182MODULE_DESCRIPTION("HDMI Connector driver");
183MODULE_LICENSE("GPL");