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 21 static 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 38 static 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 48 static int tdp158_attach(struct drm_bridge *bridge, 49 struct drm_encoder *encoder, 50 enum drm_bridge_attach_flags flags) 51 { 52 struct tdp158 *tdp158 = bridge->driver_private; 53 54 return drm_bridge_attach(encoder, tdp158->next, bridge, flags); 55 } 56 57 static const struct drm_bridge_funcs tdp158_bridge_funcs = { 58 .attach = tdp158_attach, 59 .atomic_enable = tdp158_enable, 60 .atomic_disable = tdp158_disable, 61 .atomic_duplicate_state = drm_atomic_helper_bridge_duplicate_state, 62 .atomic_destroy_state = drm_atomic_helper_bridge_destroy_state, 63 .atomic_reset = drm_atomic_helper_bridge_reset, 64 }; 65 66 static int tdp158_probe(struct i2c_client *client) 67 { 68 struct tdp158 *tdp158; 69 struct device *dev = &client->dev; 70 71 tdp158 = devm_kzalloc(dev, sizeof(*tdp158), GFP_KERNEL); 72 if (!tdp158) 73 return -ENOMEM; 74 75 tdp158->next = devm_drm_of_get_bridge(dev, dev->of_node, 1, 0); 76 if (IS_ERR(tdp158->next)) 77 return dev_err_probe(dev, PTR_ERR(tdp158->next), "missing bridge"); 78 79 tdp158->vcc = devm_regulator_get(dev, "vcc"); 80 if (IS_ERR(tdp158->vcc)) 81 return dev_err_probe(dev, PTR_ERR(tdp158->vcc), "vcc"); 82 83 tdp158->vdd = devm_regulator_get(dev, "vdd"); 84 if (IS_ERR(tdp158->vdd)) 85 return dev_err_probe(dev, PTR_ERR(tdp158->vdd), "vdd"); 86 87 tdp158->enable = devm_gpiod_get_optional(dev, "enable", GPIOD_OUT_LOW); 88 if (IS_ERR(tdp158->enable)) 89 return dev_err_probe(dev, PTR_ERR(tdp158->enable), "enable"); 90 91 tdp158->bridge.of_node = dev->of_node; 92 tdp158->bridge.funcs = &tdp158_bridge_funcs; 93 tdp158->bridge.driver_private = tdp158; 94 tdp158->dev = dev; 95 96 return devm_drm_bridge_add(dev, &tdp158->bridge); 97 } 98 99 static const struct of_device_id tdp158_match_table[] = { 100 { .compatible = "ti,tdp158" }, 101 { } 102 }; 103 MODULE_DEVICE_TABLE(of, tdp158_match_table); 104 105 static struct i2c_driver tdp158_driver = { 106 .probe = tdp158_probe, 107 .driver = { 108 .name = "tdp158", 109 .of_match_table = tdp158_match_table, 110 }, 111 }; 112 module_i2c_driver(tdp158_driver); 113 114 MODULE_DESCRIPTION("TI TDP158 driver"); 115 MODULE_LICENSE("GPL"); 116