1// SPDX-License-Identifier: GPL-2.0-only
  2/*
  3 * Copyright 2024 Freebox SAS
  4 */
  5
  6#include <linux/gpio/consumer.h>
  7#include <linux/i2c.h>
  8
  9#include <drm/drm_atomic_helper.h>
 10#include <drm/drm_bridge.h>
 11
 12struct tdp158 {
 13	struct drm_bridge bridge;
 14	struct drm_bridge *next;
 15	struct gpio_desc *enable; // Operation Enable - pin 36
 16	struct regulator *vcc; // 3.3V
 17	struct regulator *vdd; // 1.1V
 18	struct device *dev;
 19};
 20
 21static void tdp158_enable(struct drm_bridge *bridge, struct drm_bridge_state *prev)
 22{
 23	int err;
 24	struct tdp158 *tdp158 = bridge->driver_private;
 25
 26	err = regulator_enable(tdp158->vcc);
 27	if (err)
 28		dev_err(tdp158->dev, "failed to enable vcc: %d", err);
 29
 30	err = regulator_enable(tdp158->vdd);
 31	if (err)
 32		dev_err(tdp158->dev, "failed to enable vdd: %d", err);
 33
 34	gpiod_set_value_cansleep(tdp158->enable, 1);
 35}
 36
 37static void tdp158_disable(struct drm_bridge *bridge, struct drm_bridge_state *prev)
 38{
 39	struct tdp158 *tdp158 = bridge->driver_private;
 40
 41	gpiod_set_value_cansleep(tdp158->enable, 0);
 42	regulator_disable(tdp158->vdd);
 43	regulator_disable(tdp158->vcc);
 44}
 45
 46static int tdp158_attach(struct drm_bridge *bridge, enum drm_bridge_attach_flags flags)
 47{
 48	struct tdp158 *tdp158 = bridge->driver_private;
 49
 50	return drm_bridge_attach(bridge->encoder, tdp158->next, bridge, flags);
 51}
 52
 53static const struct drm_bridge_funcs tdp158_bridge_funcs = {
 54	.attach = tdp158_attach,
 55	.atomic_enable = tdp158_enable,
 56	.atomic_disable = tdp158_disable,
 57	.atomic_duplicate_state = drm_atomic_helper_bridge_duplicate_state,
 58	.atomic_destroy_state = drm_atomic_helper_bridge_destroy_state,
 59	.atomic_reset = drm_atomic_helper_bridge_reset,
 60};
 61
 62static int tdp158_probe(struct i2c_client *client)
 63{
 64	struct tdp158 *tdp158;
 65	struct device *dev = &client->dev;
 66
 67	tdp158 = devm_kzalloc(dev, sizeof(*tdp158), GFP_KERNEL);
 68	if (!tdp158)
 69		return -ENOMEM;
 70
 71	tdp158->next = devm_drm_of_get_bridge(dev, dev->of_node, 1, 0);
 72	if (IS_ERR(tdp158->next))
 73		return dev_err_probe(dev, PTR_ERR(tdp158->next), "missing bridge");
 74
 75	tdp158->vcc = devm_regulator_get(dev, "vcc");
 76	if (IS_ERR(tdp158->vcc))
 77		return dev_err_probe(dev, PTR_ERR(tdp158->vcc), "vcc");
 78
 79	tdp158->vdd = devm_regulator_get(dev, "vdd");
 80	if (IS_ERR(tdp158->vdd))
 81		return dev_err_probe(dev, PTR_ERR(tdp158->vdd), "vdd");
 82
 83	tdp158->enable = devm_gpiod_get_optional(dev, "enable", GPIOD_OUT_LOW);
 84	if (IS_ERR(tdp158->enable))
 85		return dev_err_probe(dev, PTR_ERR(tdp158->enable), "enable");
 86
 87	tdp158->bridge.of_node = dev->of_node;
 88	tdp158->bridge.funcs = &tdp158_bridge_funcs;
 89	tdp158->bridge.driver_private = tdp158;
 90	tdp158->dev = dev;
 91
 92	return devm_drm_bridge_add(dev, &tdp158->bridge);
 93}
 94
 95static const struct of_device_id tdp158_match_table[] = {
 96	{ .compatible = "ti,tdp158" },
 97	{ }
 98};
 99MODULE_DEVICE_TABLE(of, tdp158_match_table);
100
101static struct i2c_driver tdp158_driver = {
102	.probe = tdp158_probe,
103	.driver = {
104		.name = "tdp158",
105		.of_match_table = tdp158_match_table,
106	},
107};
108module_i2c_driver(tdp158_driver);
109
110MODULE_DESCRIPTION("TI TDP158 driver");
111MODULE_LICENSE("GPL");