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, 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 55 static 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 64 static 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 97 static const struct of_device_id tdp158_match_table[] = { 98 { .compatible = "ti,tdp158" }, 99 { } 100 }; 101 MODULE_DEVICE_TABLE(of, tdp158_match_table); 102 103 static struct i2c_driver tdp158_driver = { 104 .probe = tdp158_probe, 105 .driver = { 106 .name = "tdp158", 107 .of_match_table = tdp158_match_table, 108 }, 109 }; 110 module_i2c_driver(tdp158_driver); 111 112 MODULE_DESCRIPTION("TI TDP158 driver"); 113 MODULE_LICENSE("GPL"); 114