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 const struct i2c_device_id *id) 26 { 27 struct device *dev = &client->dev; 28 const struct sky81452_platform_data *pdata = dev_get_platdata(dev); 29 struct mfd_cell cells[2]; 30 struct regmap *regmap; 31 int ret; 32 33 if (!pdata) { 34 pdata = devm_kzalloc(dev, sizeof(*pdata), GFP_KERNEL); 35 if (!pdata) 36 return -ENOMEM; 37 } 38 39 regmap = devm_regmap_init_i2c(client, &sky81452_config); 40 if (IS_ERR(regmap)) { 41 dev_err(dev, "failed to initialize.err=%ld\n", PTR_ERR(regmap)); 42 return PTR_ERR(regmap); 43 } 44 45 i2c_set_clientdata(client, regmap); 46 47 memset(cells, 0, sizeof(cells)); 48 cells[0].name = "sky81452-backlight"; 49 cells[0].of_compatible = "skyworks,sky81452-backlight"; 50 cells[0].platform_data = pdata->bl_pdata; 51 cells[0].pdata_size = sizeof(*pdata->bl_pdata); 52 cells[1].name = "sky81452-regulator"; 53 cells[1].platform_data = pdata->regulator_init_data; 54 cells[1].pdata_size = sizeof(*pdata->regulator_init_data); 55 56 ret = devm_mfd_add_devices(dev, -1, cells, ARRAY_SIZE(cells), 57 NULL, 0, NULL); 58 if (ret) 59 dev_err(dev, "failed to add child devices. err=%d\n", ret); 60 61 return ret; 62 } 63 64 static const struct i2c_device_id sky81452_ids[] = { 65 { "sky81452" }, 66 { } 67 }; 68 MODULE_DEVICE_TABLE(i2c, sky81452_ids); 69 70 #ifdef CONFIG_OF 71 static const struct of_device_id sky81452_of_match[] = { 72 { .compatible = "skyworks,sky81452", }, 73 { } 74 }; 75 MODULE_DEVICE_TABLE(of, sky81452_of_match); 76 #endif 77 78 static struct i2c_driver sky81452_driver = { 79 .driver = { 80 .name = "sky81452", 81 .of_match_table = of_match_ptr(sky81452_of_match), 82 }, 83 .probe = sky81452_probe, 84 .id_table = sky81452_ids, 85 }; 86 87 module_i2c_driver(sky81452_driver); 88 89 MODULE_DESCRIPTION("Skyworks SKY81452 MFD driver"); 90 MODULE_AUTHOR("Gyungoh Yoo <jack.yoo@skyworksinc.com>"); 91 MODULE_LICENSE("GPL v2"); 92