112 lines
3.0 KiB
C
112 lines
3.0 KiB
C
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// SPDX-License-Identifier: GPL-2.0-only
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/*
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* Copyright 2024 Freebox SAS
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*/
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#include <linux/gpio/consumer.h>
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#include <linux/i2c.h>
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#include <drm/drm_atomic_helper.h>
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#include <drm/drm_bridge.h>
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struct tdp158 {
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struct drm_bridge bridge;
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struct drm_bridge *next;
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struct gpio_desc *enable; // Operation Enable - pin 36
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struct regulator *vcc; // 3.3V
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struct regulator *vdd; // 1.1V
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struct device *dev;
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};
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static void tdp158_enable(struct drm_bridge *bridge, struct drm_bridge_state *prev)
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{
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int err;
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struct tdp158 *tdp158 = bridge->driver_private;
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err = regulator_enable(tdp158->vcc);
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if (err)
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dev_err(tdp158->dev, "failed to enable vcc: %d", err);
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err = regulator_enable(tdp158->vdd);
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if (err)
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dev_err(tdp158->dev, "failed to enable vdd: %d", err);
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gpiod_set_value_cansleep(tdp158->enable, 1);
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}
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static void tdp158_disable(struct drm_bridge *bridge, struct drm_bridge_state *prev)
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{
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struct tdp158 *tdp158 = bridge->driver_private;
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gpiod_set_value_cansleep(tdp158->enable, 0);
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regulator_disable(tdp158->vdd);
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regulator_disable(tdp158->vcc);
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}
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static int tdp158_attach(struct drm_bridge *bridge, enum drm_bridge_attach_flags flags)
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{
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struct tdp158 *tdp158 = bridge->driver_private;
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return drm_bridge_attach(bridge->encoder, tdp158->next, bridge, flags);
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}
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static const struct drm_bridge_funcs tdp158_bridge_funcs = {
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.attach = tdp158_attach,
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.atomic_enable = tdp158_enable,
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.atomic_disable = tdp158_disable,
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.atomic_duplicate_state = drm_atomic_helper_bridge_duplicate_state,
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.atomic_destroy_state = drm_atomic_helper_bridge_destroy_state,
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.atomic_reset = drm_atomic_helper_bridge_reset,
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};
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static int tdp158_probe(struct i2c_client *client)
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{
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struct tdp158 *tdp158;
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struct device *dev = &client->dev;
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tdp158 = devm_kzalloc(dev, sizeof(*tdp158), GFP_KERNEL);
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if (!tdp158)
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return -ENOMEM;
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tdp158->next = devm_drm_of_get_bridge(dev, dev->of_node, 1, 0);
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if (IS_ERR(tdp158->next))
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return dev_err_probe(dev, PTR_ERR(tdp158->next), "missing bridge");
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tdp158->vcc = devm_regulator_get(dev, "vcc");
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if (IS_ERR(tdp158->vcc))
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return dev_err_probe(dev, PTR_ERR(tdp158->vcc), "vcc");
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tdp158->vdd = devm_regulator_get(dev, "vdd");
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if (IS_ERR(tdp158->vdd))
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return dev_err_probe(dev, PTR_ERR(tdp158->vdd), "vdd");
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tdp158->enable = devm_gpiod_get_optional(dev, "enable", GPIOD_OUT_LOW);
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if (IS_ERR(tdp158->enable))
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return dev_err_probe(dev, PTR_ERR(tdp158->enable), "enable");
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tdp158->bridge.of_node = dev->of_node;
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tdp158->bridge.funcs = &tdp158_bridge_funcs;
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tdp158->bridge.driver_private = tdp158;
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tdp158->dev = dev;
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return devm_drm_bridge_add(dev, &tdp158->bridge);
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}
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static const struct of_device_id tdp158_match_table[] = {
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{ .compatible = "ti,tdp158" },
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{ }
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};
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MODULE_DEVICE_TABLE(of, tdp158_match_table);
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static struct i2c_driver tdp158_driver = {
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.probe = tdp158_probe,
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.driver = {
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.name = "tdp158",
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.of_match_table = tdp158_match_table,
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},
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};
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module_i2c_driver(tdp158_driver);
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MODULE_DESCRIPTION("TI TDP158 driver");
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MODULE_LICENSE("GPL");
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