1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * sky81452.c SKY81452 MFD driver 4 * 5 * Copyright 2014 Skyworks Solutions Inc. 6 * Author : Gyungoh Yoo <jack.yoo@skyworksinc.com> 7 */ 8 9 #include <linux/kernel.h> 10 #include <linux/module.h> 11 #include <linux/init.h> 12 #include <linux/err.h> 13 #include <linux/slab.h> 14 #include <linux/i2c.h> 15 #include <linux/regmap.h> 16 #include <linux/mfd/core.h> 17 #include <linux/mfd/sky81452.h> 18 19 static const struct regmap_config sky81452_config = { 20 .reg_bits = 8, 21 .val_bits = 8, 22 }; 23 24 static int sky81452_probe(struct i2c_client *client) 25 { 26 struct device *dev = &client->dev; 27 const struct sky81452_platform_data *pdata = dev_get_platdata(dev); 28 struct mfd_cell cells[2]; 29 struct regmap *regmap; 30 int ret; 31 32 if (!pdata) { 33 pdata = devm_kzalloc(dev, sizeof(*pdata), GFP_KERNEL); 34 if (!pdata) 35 return -ENOMEM; 36 } 37 38 regmap = devm_regmap_init_i2c(client, &sky81452_config); 39 if (IS_ERR(regmap)) { 40 dev_err(dev, "failed to initialize.err=%ld\n", PTR_ERR(regmap)); 41 return PTR_ERR(regmap); 42 } 43 44 i2c_set_clientdata(client, regmap); 45 46 memset(cells, 0, sizeof(cells)); 47 cells[0].name = "sky81452-backlight"; 48 cells[0].of_compatible = "skyworks,sky81452-backlight"; 49 cells[1].name = "sky81452-regulator"; 50 cells[1].platform_data = pdata->regulator_init_data; 51 cells[1].pdata_size = sizeof(*pdata->regulator_init_data); 52 53 ret = devm_mfd_add_devices(dev, -1, cells, ARRAY_SIZE(cells), 54 NULL, 0, NULL); 55 if (ret) 56 dev_err(dev, "failed to add child devices. err=%d\n", ret); 57 58 return ret; 59 } 60 61 static const struct i2c_device_id sky81452_ids[] = { 62 { "sky81452" }, 63 { } 64 }; 65 MODULE_DEVICE_TABLE(i2c, sky81452_ids); 66 67 #ifdef CONFIG_OF 68 static const struct of_device_id sky81452_of_match[] = { 69 { .compatible = "skyworks,sky81452", }, 70 { } 71 }; 72 MODULE_DEVICE_TABLE(of, sky81452_of_match); 73 #endif 74 75 static struct i2c_driver sky81452_driver = { 76 .driver = { 77 .name = "sky81452", 78 .of_match_table = of_match_ptr(sky81452_of_match), 79 }, 80 .probe = sky81452_probe, 81 .id_table = sky81452_ids, 82 }; 83 84 module_i2c_driver(sky81452_driver); 85 86 MODULE_DESCRIPTION("Skyworks SKY81452 MFD driver"); 87 MODULE_AUTHOR("Gyungoh Yoo <jack.yoo@skyworksinc.com>"); 88 MODULE_LICENSE("GPL v2"); 89