| lh | 9ed821d | 2023-04-07 01:36:19 -0700 | [diff] [blame] | 1 | /* |
| 2 | * tps65912-i2c.c -- I2C access for TI TPS65912x PMIC |
| 3 | * |
| 4 | * Copyright 2011 Texas Instruments Inc. |
| 5 | * |
| 6 | * Author: Margarita Olaya Cabrera <magi@slimlogic.co.uk> |
| 7 | * |
| 8 | * This program is free software; you can redistribute it and/or modify it |
| 9 | * under the terms of the GNU General Public License as published by the |
| 10 | * Free Software Foundation; either version 2 of the License, or (at your |
| 11 | * option) any later version. |
| 12 | * |
| 13 | * This driver is based on wm8350 implementation. |
| 14 | */ |
| 15 | |
| 16 | #include <linux/module.h> |
| 17 | #include <linux/moduleparam.h> |
| 18 | #include <linux/init.h> |
| 19 | #include <linux/slab.h> |
| 20 | #include <linux/gpio.h> |
| 21 | #include <linux/i2c.h> |
| 22 | #include <linux/mfd/core.h> |
| 23 | #include <linux/mfd/tps65912.h> |
| 24 | |
| 25 | static int tps65912_i2c_read(struct tps65912 *tps65912, u8 reg, |
| 26 | int bytes, void *dest) |
| 27 | { |
| 28 | struct i2c_client *i2c = tps65912->control_data; |
| 29 | struct i2c_msg xfer[2]; |
| 30 | int ret; |
| 31 | |
| 32 | /* Write register */ |
| 33 | xfer[0].addr = i2c->addr; |
| 34 | xfer[0].flags = 0; |
| 35 | xfer[0].len = 1; |
| 36 | xfer[0].buf = ® |
| 37 | |
| 38 | /* Read data */ |
| 39 | xfer[1].addr = i2c->addr; |
| 40 | xfer[1].flags = I2C_M_RD; |
| 41 | xfer[1].len = bytes; |
| 42 | xfer[1].buf = dest; |
| 43 | |
| 44 | ret = i2c_transfer(i2c->adapter, xfer, 2); |
| 45 | if (ret == 2) |
| 46 | ret = 0; |
| 47 | else if (ret >= 0) |
| 48 | ret = -EIO; |
| 49 | return ret; |
| 50 | } |
| 51 | |
| 52 | static int tps65912_i2c_write(struct tps65912 *tps65912, u8 reg, |
| 53 | int bytes, void *src) |
| 54 | { |
| 55 | struct i2c_client *i2c = tps65912->control_data; |
| 56 | /* we add 1 byte for device register */ |
| 57 | u8 msg[TPS6591X_MAX_REGISTER + 1]; |
| 58 | int ret; |
| 59 | |
| 60 | if (bytes > TPS6591X_MAX_REGISTER) |
| 61 | return -EINVAL; |
| 62 | |
| 63 | msg[0] = reg; |
| 64 | memcpy(&msg[1], src, bytes); |
| 65 | |
| 66 | ret = i2c_master_send(i2c, msg, bytes + 1); |
| 67 | if (ret < 0) |
| 68 | return ret; |
| 69 | if (ret != bytes + 1) |
| 70 | return -EIO; |
| 71 | |
| 72 | return 0; |
| 73 | } |
| 74 | |
| 75 | static int tps65912_i2c_probe(struct i2c_client *i2c, |
| 76 | const struct i2c_device_id *id) |
| 77 | { |
| 78 | struct tps65912 *tps65912; |
| 79 | |
| 80 | tps65912 = kzalloc(sizeof(struct tps65912), GFP_KERNEL); |
| 81 | if (tps65912 == NULL) |
| 82 | return -ENOMEM; |
| 83 | |
| 84 | i2c_set_clientdata(i2c, tps65912); |
| 85 | tps65912->dev = &i2c->dev; |
| 86 | tps65912->control_data = i2c; |
| 87 | tps65912->read = tps65912_i2c_read; |
| 88 | tps65912->write = tps65912_i2c_write; |
| 89 | |
| 90 | return tps65912_device_init(tps65912); |
| 91 | } |
| 92 | |
| 93 | static int tps65912_i2c_remove(struct i2c_client *i2c) |
| 94 | { |
| 95 | struct tps65912 *tps65912 = i2c_get_clientdata(i2c); |
| 96 | |
| 97 | tps65912_device_exit(tps65912); |
| 98 | |
| 99 | return 0; |
| 100 | } |
| 101 | |
| 102 | static const struct i2c_device_id tps65912_i2c_id[] = { |
| 103 | {"tps65912", 0 }, |
| 104 | { } |
| 105 | }; |
| 106 | MODULE_DEVICE_TABLE(i2c, tps65912_i2c_id); |
| 107 | |
| 108 | static struct i2c_driver tps65912_i2c_driver = { |
| 109 | .driver = { |
| 110 | .name = "tps65912", |
| 111 | .owner = THIS_MODULE, |
| 112 | }, |
| 113 | .probe = tps65912_i2c_probe, |
| 114 | .remove = tps65912_i2c_remove, |
| 115 | .id_table = tps65912_i2c_id, |
| 116 | }; |
| 117 | |
| 118 | static int __init tps65912_i2c_init(void) |
| 119 | { |
| 120 | int ret; |
| 121 | |
| 122 | ret = i2c_add_driver(&tps65912_i2c_driver); |
| 123 | if (ret != 0) |
| 124 | pr_err("Failed to register TPS65912 I2C driver: %d\n", ret); |
| 125 | |
| 126 | return ret; |
| 127 | } |
| 128 | /* init early so consumer devices can complete system boot */ |
| 129 | subsys_initcall(tps65912_i2c_init); |
| 130 | |
| 131 | static void __exit tps65912_i2c_exit(void) |
| 132 | { |
| 133 | i2c_del_driver(&tps65912_i2c_driver); |
| 134 | } |
| 135 | module_exit(tps65912_i2c_exit); |
| 136 | |
| 137 | MODULE_AUTHOR("Margarita Olaya <magi@slimlogic.co.uk>"); |
| 138 | MODULE_DESCRIPTION("TPS6591x chip family multi-function driver"); |
| 139 | MODULE_LICENSE("GPL"); |