tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
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,
22 struct drm_atomic_state *state)
23{
24 int err;
25 struct tdp158 *tdp158 = bridge->driver_private;
26
27 err = regulator_enable(tdp158->vcc);
28 if (err)
29 dev_err(tdp158->dev, "failed to enable vcc: %d", err);
30
31 err = regulator_enable(tdp158->vdd);
32 if (err)
33 dev_err(tdp158->dev, "failed to enable vdd: %d", err);
34
35 gpiod_set_value_cansleep(tdp158->enable, 1);
36}
37
38static void tdp158_disable(struct drm_bridge *bridge,
39 struct drm_atomic_state *state)
40{
41 struct tdp158 *tdp158 = bridge->driver_private;
42
43 gpiod_set_value_cansleep(tdp158->enable, 0);
44 regulator_disable(tdp158->vdd);
45 regulator_disable(tdp158->vcc);
46}
47
48static int tdp158_attach(struct drm_bridge *bridge, enum drm_bridge_attach_flags flags)
49{
50 struct tdp158 *tdp158 = bridge->driver_private;
51
52 return drm_bridge_attach(bridge->encoder, tdp158->next, bridge, flags);
53}
54
55static const struct drm_bridge_funcs tdp158_bridge_funcs = {
56 .attach = tdp158_attach,
57 .atomic_enable = tdp158_enable,
58 .atomic_disable = tdp158_disable,
59 .atomic_duplicate_state = drm_atomic_helper_bridge_duplicate_state,
60 .atomic_destroy_state = drm_atomic_helper_bridge_destroy_state,
61 .atomic_reset = drm_atomic_helper_bridge_reset,
62};
63
64static int tdp158_probe(struct i2c_client *client)
65{
66 struct tdp158 *tdp158;
67 struct device *dev = &client->dev;
68
69 tdp158 = devm_kzalloc(dev, sizeof(*tdp158), GFP_KERNEL);
70 if (!tdp158)
71 return -ENOMEM;
72
73 tdp158->next = devm_drm_of_get_bridge(dev, dev->of_node, 1, 0);
74 if (IS_ERR(tdp158->next))
75 return dev_err_probe(dev, PTR_ERR(tdp158->next), "missing bridge");
76
77 tdp158->vcc = devm_regulator_get(dev, "vcc");
78 if (IS_ERR(tdp158->vcc))
79 return dev_err_probe(dev, PTR_ERR(tdp158->vcc), "vcc");
80
81 tdp158->vdd = devm_regulator_get(dev, "vdd");
82 if (IS_ERR(tdp158->vdd))
83 return dev_err_probe(dev, PTR_ERR(tdp158->vdd), "vdd");
84
85 tdp158->enable = devm_gpiod_get_optional(dev, "enable", GPIOD_OUT_LOW);
86 if (IS_ERR(tdp158->enable))
87 return dev_err_probe(dev, PTR_ERR(tdp158->enable), "enable");
88
89 tdp158->bridge.of_node = dev->of_node;
90 tdp158->bridge.funcs = &tdp158_bridge_funcs;
91 tdp158->bridge.driver_private = tdp158;
92 tdp158->dev = dev;
93
94 return devm_drm_bridge_add(dev, &tdp158->bridge);
95}
96
97static const struct of_device_id tdp158_match_table[] = {
98 { .compatible = "ti,tdp158" },
99 { }
100};
101MODULE_DEVICE_TABLE(of, tdp158_match_table);
102
103static struct i2c_driver tdp158_driver = {
104 .probe = tdp158_probe,
105 .driver = {
106 .name = "tdp158",
107 .of_match_table = tdp158_match_table,
108 },
109};
110module_i2c_driver(tdp158_driver);
111
112MODULE_DESCRIPTION("TI TDP158 driver");
113MODULE_LICENSE("GPL");