ti-tpd12s015.c

  1// SPDX-License-Identifier: GPL-2.0
  2/*
  3 * TPD12S015 HDMI ESD protection & level shifter chip driver
  4 *
  5 * Copyright (C) 2019 Texas Instruments Incorporated
  6 *
  7 * Based on the omapdrm-specific encoder-opa362 driver
  8 *
  9 * Copyright (C) 2013 Texas Instruments Incorporated
 10 * Author: Tomi Valkeinen <tomi.valkeinen@ti.com>
 11 */
 12
 13#include <linux/delay.h>
 14#include <linux/gpio/consumer.h>
 15#include <linux/interrupt.h>
 16#include <linux/module.h>
 17#include <linux/mutex.h>
 18#include <linux/of.h>
 19#include <linux/of_graph.h>
 20#include <linux/platform_device.h>
 21
 22#include <drm/drm_bridge.h>
 23
 24struct tpd12s015_device {
 25	struct drm_bridge bridge;
 26
 27	struct gpio_desc *ct_cp_hpd_gpio;
 28	struct gpio_desc *ls_oe_gpio;
 29	struct gpio_desc *hpd_gpio;
 30	int hpd_irq;
 31
 32	struct drm_bridge *next_bridge;
 33};
 34
 35static inline struct tpd12s015_device *to_tpd12s015(struct drm_bridge *bridge)
 36{
 37	return container_of(bridge, struct tpd12s015_device, bridge);
 38}
 39
 40static int tpd12s015_attach(struct drm_bridge *bridge,
 41			    struct drm_encoder *encoder,
 42			    enum drm_bridge_attach_flags flags)
 43{
 44	struct tpd12s015_device *tpd = to_tpd12s015(bridge);
 45	int ret;
 46
 47	if (!(flags & DRM_BRIDGE_ATTACH_NO_CONNECTOR))
 48		return -EINVAL;
 49
 50	ret = drm_bridge_attach(encoder, tpd->next_bridge,
 51				bridge, flags);
 52	if (ret < 0)
 53		return ret;
 54
 55	gpiod_set_value_cansleep(tpd->ls_oe_gpio, 1);
 56
 57	/* DC-DC converter needs at max 300us to get to 90% of 5V. */
 58	usleep_range(300, 1000);
 59
 60	return 0;
 61}
 62
 63static void tpd12s015_detach(struct drm_bridge *bridge)
 64{
 65	struct tpd12s015_device *tpd = to_tpd12s015(bridge);
 66
 67	gpiod_set_value_cansleep(tpd->ls_oe_gpio, 0);
 68}
 69
 70static enum drm_connector_status tpd12s015_detect(struct drm_bridge *bridge)
 71{
 72	struct tpd12s015_device *tpd = to_tpd12s015(bridge);
 73
 74	if (gpiod_get_value_cansleep(tpd->hpd_gpio))
 75		return connector_status_connected;
 76	else
 77		return connector_status_disconnected;
 78}
 79
 80static enum drm_connector_status
 81tpd12s015_bridge_detect(struct drm_bridge *bridge, struct drm_connector *connector)
 82{
 83	return tpd12s015_detect(bridge);
 84}
 85
 86static void tpd12s015_hpd_enable(struct drm_bridge *bridge)
 87{
 88	struct tpd12s015_device *tpd = to_tpd12s015(bridge);
 89
 90	gpiod_set_value_cansleep(tpd->ct_cp_hpd_gpio, 1);
 91}
 92
 93static void tpd12s015_hpd_disable(struct drm_bridge *bridge)
 94{
 95	struct tpd12s015_device *tpd = to_tpd12s015(bridge);
 96
 97	gpiod_set_value_cansleep(tpd->ct_cp_hpd_gpio, 0);
 98}
 99
100static const struct drm_bridge_funcs tpd12s015_bridge_funcs = {
101	.attach			= tpd12s015_attach,
102	.detach			= tpd12s015_detach,
103	.detect			= tpd12s015_bridge_detect,
104	.hpd_enable		= tpd12s015_hpd_enable,
105	.hpd_disable		= tpd12s015_hpd_disable,
106};
107
108static irqreturn_t tpd12s015_hpd_isr(int irq, void *data)
109{
110	struct tpd12s015_device *tpd = data;
111	struct drm_bridge *bridge = &tpd->bridge;
112
113	drm_bridge_hpd_notify(bridge, tpd12s015_detect(bridge));
114
115	return IRQ_HANDLED;
116}
117
118static int tpd12s015_probe(struct platform_device *pdev)
119{
120	struct tpd12s015_device *tpd;
121	struct device_node *node;
122	struct gpio_desc *gpio;
123	int ret;
124
125	tpd = devm_drm_bridge_alloc(&pdev->dev, struct tpd12s015_device,
126				    bridge, &tpd12s015_bridge_funcs);
127	if (IS_ERR(tpd))
128		return PTR_ERR(tpd);
129
130	platform_set_drvdata(pdev, tpd);
131
132	tpd->bridge.of_node = pdev->dev.of_node;
133	tpd->bridge.type = DRM_MODE_CONNECTOR_HDMIA;
134	tpd->bridge.ops = DRM_BRIDGE_OP_DETECT;
135
136	/* Get the next bridge, connected to port@1. */
137	node = of_graph_get_remote_node(pdev->dev.of_node, 1, -1);
138	if (!node)
139		return -ENODEV;
140
141	tpd->next_bridge = of_drm_find_bridge(node);
142	of_node_put(node);
143
144	if (!tpd->next_bridge)
145		return -EPROBE_DEFER;
146
147	/* Get the control and HPD GPIOs. */
148	gpio = devm_gpiod_get_index_optional(&pdev->dev, NULL, 0,
149					     GPIOD_OUT_LOW);
150	if (IS_ERR(gpio))
151		return PTR_ERR(gpio);
152
153	tpd->ct_cp_hpd_gpio = gpio;
154
155	gpio = devm_gpiod_get_index_optional(&pdev->dev, NULL, 1,
156					     GPIOD_OUT_LOW);
157	if (IS_ERR(gpio))
158		return PTR_ERR(gpio);
159
160	tpd->ls_oe_gpio = gpio;
161
162	gpio = devm_gpiod_get_index(&pdev->dev, NULL, 2, GPIOD_IN);
163	if (IS_ERR(gpio))
164		return PTR_ERR(gpio);
165
166	tpd->hpd_gpio = gpio;
167
168	/* Register the IRQ if the HPD GPIO is IRQ-capable. */
169	tpd->hpd_irq = gpiod_to_irq(tpd->hpd_gpio);
170	if (tpd->hpd_irq >= 0) {
171		ret = devm_request_threaded_irq(&pdev->dev, tpd->hpd_irq, NULL,
172						tpd12s015_hpd_isr,
173						IRQF_TRIGGER_RISING |
174						IRQF_TRIGGER_FALLING |
175						IRQF_ONESHOT,
176						"tpd12s015 hpd", tpd);
177		if (ret)
178			return ret;
179
180		tpd->bridge.ops |= DRM_BRIDGE_OP_HPD;
181	}
182
183	/* Register the DRM bridge. */
184	drm_bridge_add(&tpd->bridge);
185
186	return 0;
187}
188
189static void tpd12s015_remove(struct platform_device *pdev)
190{
191	struct tpd12s015_device *tpd = platform_get_drvdata(pdev);
192
193	drm_bridge_remove(&tpd->bridge);
194}
195
196static const struct of_device_id tpd12s015_of_match[] = {
197	{ .compatible = "ti,tpd12s015", },
198	{},
199};
200
201MODULE_DEVICE_TABLE(of, tpd12s015_of_match);
202
203static struct platform_driver tpd12s015_driver = {
204	.probe	= tpd12s015_probe,
205	.remove = tpd12s015_remove,
206	.driver	= {
207		.name	= "tpd12s015",
208		.of_match_table = tpd12s015_of_match,
209	},
210};
211
212module_platform_driver(tpd12s015_driver);
213
214MODULE_AUTHOR("Tomi Valkeinen <tomi.valkeinen@ti.com>");
215MODULE_DESCRIPTION("TPD12S015 HDMI level shifter and ESD protection driver");
216MODULE_LICENSE("GPL");