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
12 struct 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
tdp158_enable(struct drm_bridge * bridge,struct drm_bridge_state * prev)21 static 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
tdp158_disable(struct drm_bridge * bridge,struct drm_bridge_state * prev)37 static 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
tdp158_attach(struct drm_bridge * bridge,enum drm_bridge_attach_flags flags)46 static 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
53 static 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
tdp158_probe(struct i2c_client * client)62 static 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
95 static const struct of_device_id tdp158_match_table[] = {
96 { .compatible = "ti,tdp158" },
97 { }
98 };
99 MODULE_DEVICE_TABLE(of, tdp158_match_table);
100
101 static struct i2c_driver tdp158_driver = {
102 .probe = tdp158_probe,
103 .driver = {
104 .name = "tdp158",
105 .of_match_table = tdp158_match_table,
106 },
107 };
108 module_i2c_driver(tdp158_driver);
109
110 MODULE_DESCRIPTION("TI TDP158 driver");
111 MODULE_LICENSE("GPL");
112