1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * Copyright (C) 2019 Sven Van Asbroeck 4 */ 5 6 #include <linux/leds.h> 7 #include <linux/module.h> 8 #include <linux/platform_device.h> 9 #include <linux/mfd/tps6105x.h> 10 #include <linux/regmap.h> 11 12 struct tps6105x_priv { 13 struct regmap *regmap; 14 struct led_classdev cdev; 15 struct fwnode_handle *fwnode; 16 }; 17 18 static void tps6105x_handle_put(void *data) 19 { 20 struct tps6105x_priv *priv = data; 21 22 fwnode_handle_put(priv->fwnode); 23 } 24 25 static int tps6105x_brightness_set(struct led_classdev *cdev, 26 enum led_brightness brightness) 27 { 28 struct tps6105x_priv *priv = container_of(cdev, struct tps6105x_priv, 29 cdev); 30 31 return regmap_update_bits(priv->regmap, TPS6105X_REG_0, 32 TPS6105X_REG0_TORCHC_MASK, 33 brightness << TPS6105X_REG0_TORCHC_SHIFT); 34 } 35 36 static int tps6105x_led_probe(struct platform_device *pdev) 37 { 38 struct tps6105x *tps6105x = dev_get_platdata(&pdev->dev); 39 struct tps6105x_platform_data *pdata = tps6105x->pdata; 40 struct led_init_data init_data = { }; 41 struct tps6105x_priv *priv; 42 int ret; 43 44 /* This instance is not set for torch mode so bail out */ 45 if (pdata->mode != TPS6105X_MODE_TORCH) { 46 dev_info(&pdev->dev, 47 "chip not in torch mode, exit probe"); 48 return -EINVAL; 49 } 50 51 priv = devm_kzalloc(&pdev->dev, sizeof(*priv), GFP_KERNEL); 52 if (!priv) 53 return -ENOMEM; 54 /* fwnode/devicetree is optional. NULL is allowed for priv->fwnode */ 55 priv->fwnode = device_get_next_child_node(pdev->dev.parent, NULL); 56 ret = devm_add_action_or_reset(&pdev->dev, tps6105x_handle_put, priv); 57 if (ret) 58 return ret; 59 priv->regmap = tps6105x->regmap; 60 priv->cdev.brightness_set_blocking = tps6105x_brightness_set; 61 priv->cdev.max_brightness = 7; 62 init_data.devicename = "tps6105x"; 63 init_data.default_label = ":torch"; 64 init_data.fwnode = priv->fwnode; 65 66 ret = regmap_update_bits(tps6105x->regmap, TPS6105X_REG_0, 67 TPS6105X_REG0_MODE_MASK | 68 TPS6105X_REG0_TORCHC_MASK, 69 TPS6105X_REG0_MODE_TORCH << 70 TPS6105X_REG0_MODE_SHIFT); 71 if (ret) 72 return ret; 73 74 return devm_led_classdev_register_ext(&pdev->dev, &priv->cdev, 75 &init_data); 76 } 77 78 static struct platform_driver led_driver = { 79 .probe = tps6105x_led_probe, 80 .driver = { 81 .name = "tps6105x-leds", 82 }, 83 }; 84 85 module_platform_driver(led_driver); 86 87 MODULE_DESCRIPTION("TPS6105x LED driver"); 88 MODULE_AUTHOR("Sven Van Asbroeck <TheSven73@gmail.com>"); 89 MODULE_LICENSE("GPL v2"); 90