1 /* 2 * Copyright (C) 2016 Texas Instruments Incorporated - https://www.ti.com/ 3 * 4 * Author: Keerthy <j-keerthy@ti.com> 5 * 6 * This program is free software; you can redistribute it and/or 7 * modify it under the terms of the GNU General Public License as 8 * published by the Free Software Foundation version 2. 9 * 10 * This program is distributed "as is" WITHOUT ANY WARRANTY of any 11 * kind, whether express or implied; without even the implied warranty 12 * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 13 * GNU General Public License for more details. 14 */ 15 16 #include <linux/interrupt.h> 17 #include <linux/mfd/core.h> 18 #include <linux/module.h> 19 #include <linux/of_device.h> 20 #include <linux/regmap.h> 21 22 #include <linux/mfd/lp873x.h> 23 24 static const struct regmap_config lp873x_regmap_config = { 25 .reg_bits = 8, 26 .val_bits = 8, 27 .max_register = LP873X_REG_MAX, 28 }; 29 30 static const struct mfd_cell lp873x_cells[] = { 31 { .name = "lp873x-regulator", }, 32 { .name = "lp873x-gpio", }, 33 }; 34 35 static int lp873x_probe(struct i2c_client *client, 36 const struct i2c_device_id *ids) 37 { 38 struct lp873x *lp873; 39 int ret; 40 unsigned int otpid; 41 42 lp873 = devm_kzalloc(&client->dev, sizeof(*lp873), GFP_KERNEL); 43 if (!lp873) 44 return -ENOMEM; 45 46 lp873->dev = &client->dev; 47 48 lp873->regmap = devm_regmap_init_i2c(client, &lp873x_regmap_config); 49 if (IS_ERR(lp873->regmap)) { 50 ret = PTR_ERR(lp873->regmap); 51 dev_err(lp873->dev, 52 "Failed to initialize register map: %d\n", ret); 53 return ret; 54 } 55 56 ret = regmap_read(lp873->regmap, LP873X_REG_OTP_REV, &otpid); 57 if (ret) { 58 dev_err(lp873->dev, "Failed to read OTP ID\n"); 59 return ret; 60 } 61 62 lp873->rev = otpid & LP873X_OTP_REV_OTP_ID; 63 64 i2c_set_clientdata(client, lp873); 65 66 ret = mfd_add_devices(lp873->dev, PLATFORM_DEVID_AUTO, lp873x_cells, 67 ARRAY_SIZE(lp873x_cells), NULL, 0, NULL); 68 69 return ret; 70 } 71 72 static const struct of_device_id of_lp873x_match_table[] = { 73 { .compatible = "ti,lp8733", }, 74 { .compatible = "ti,lp8732", }, 75 {} 76 }; 77 MODULE_DEVICE_TABLE(of, of_lp873x_match_table); 78 79 static const struct i2c_device_id lp873x_id_table[] = { 80 { "lp873x", 0 }, 81 { }, 82 }; 83 MODULE_DEVICE_TABLE(i2c, lp873x_id_table); 84 85 static struct i2c_driver lp873x_driver = { 86 .driver = { 87 .name = "lp873x", 88 .of_match_table = of_lp873x_match_table, 89 }, 90 .probe = lp873x_probe, 91 .id_table = lp873x_id_table, 92 }; 93 module_i2c_driver(lp873x_driver); 94 95 MODULE_AUTHOR("J Keerthy <j-keerthy@ti.com>"); 96 MODULE_DESCRIPTION("LP873X chip family Multi-Function Device driver"); 97 MODULE_LICENSE("GPL v2"); 98