projects / linux-2.6-block.git / blame
| Commit | Line | Data |
|---|---|---|
| 36e52873 MO |
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 | ||
| 63c8a58d | 60 | if (bytes > TPS6591X_MAX_REGISTER) |
| 36e52873 MO |
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 | ||
| b3fff177 LJ |
80 | tps65912 = devm_kzalloc(&i2c->dev, |
| 81 | sizeof(struct tps65912), GFP_KERNEL); | |
| 36e52873 MO |
82 | if (tps65912 == NULL) |
| 83 | return -ENOMEM; | |
| 84 | ||
| 85 | i2c_set_clientdata(i2c, tps65912); | |
| 86 | tps65912->dev = &i2c->dev; | |
| 87 | tps65912->control_data = i2c; | |
| 88 | tps65912->read = tps65912_i2c_read; | |
| 89 | tps65912->write = tps65912_i2c_write; | |
| 90 | ||
| 91 | return tps65912_device_init(tps65912); | |
| 92 | } | |
| 93 | ||
| 94 | static int tps65912_i2c_remove(struct i2c_client *i2c) | |
| 95 | { | |
| 96 | struct tps65912 *tps65912 = i2c_get_clientdata(i2c); | |
| 97 | ||
| 98 | tps65912_device_exit(tps65912); | |
| 99 | ||
| 100 | return 0; | |
| 101 | } | |
| 102 | ||
| 103 | static const struct i2c_device_id tps65912_i2c_id[] = { | |
| 104 | {"tps65912", 0 }, | |
| 105 | { } | |
| 106 | }; | |
| 107 | MODULE_DEVICE_TABLE(i2c, tps65912_i2c_id); | |
| 108 | ||
| 109 | static struct i2c_driver tps65912_i2c_driver = { | |
| 110 | .driver = { | |
| 111 | .name = "tps65912", | |
| 36e52873 MO |
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"); |