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140 lines
3.1 KiB
140 lines
3.1 KiB
/* |
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* tps65912-i2c.c -- I2C access for TI TPS65912x PMIC |
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* |
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* Copyright 2011 Texas Instruments Inc. |
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* |
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* Author: Margarita Olaya Cabrera <magi@slimlogic.co.uk> |
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* |
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* This program is free software; you can redistribute it and/or modify it |
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* under the terms of the GNU General Public License as published by the |
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* Free Software Foundation; either version 2 of the License, or (at your |
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* option) any later version. |
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* |
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* This driver is based on wm8350 implementation. |
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*/ |
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#include <linux/module.h> |
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#include <linux/moduleparam.h> |
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#include <linux/init.h> |
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#include <linux/slab.h> |
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#include <linux/gpio.h> |
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#include <linux/i2c.h> |
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#include <linux/mfd/core.h> |
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#include <linux/mfd/tps65912.h> |
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static int tps65912_i2c_read(struct tps65912 *tps65912, u8 reg, |
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int bytes, void *dest) |
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{ |
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struct i2c_client *i2c = tps65912->control_data; |
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struct i2c_msg xfer[2]; |
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int ret; |
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/* Write register */ |
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xfer[0].addr = i2c->addr; |
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xfer[0].flags = 0; |
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xfer[0].len = 1; |
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xfer[0].buf = ® |
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/* Read data */ |
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xfer[1].addr = i2c->addr; |
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xfer[1].flags = I2C_M_RD; |
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xfer[1].len = bytes; |
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xfer[1].buf = dest; |
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ret = i2c_transfer(i2c->adapter, xfer, 2); |
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if (ret == 2) |
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ret = 0; |
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else if (ret >= 0) |
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ret = -EIO; |
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return ret; |
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} |
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static int tps65912_i2c_write(struct tps65912 *tps65912, u8 reg, |
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int bytes, void *src) |
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{ |
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struct i2c_client *i2c = tps65912->control_data; |
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/* we add 1 byte for device register */ |
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u8 msg[TPS6591X_MAX_REGISTER + 1]; |
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int ret; |
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if (bytes > TPS6591X_MAX_REGISTER) |
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return -EINVAL; |
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msg[0] = reg; |
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memcpy(&msg[1], src, bytes); |
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ret = i2c_master_send(i2c, msg, bytes + 1); |
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if (ret < 0) |
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return ret; |
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if (ret != bytes + 1) |
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return -EIO; |
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return 0; |
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} |
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static int tps65912_i2c_probe(struct i2c_client *i2c, |
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const struct i2c_device_id *id) |
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{ |
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struct tps65912 *tps65912; |
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tps65912 = devm_kzalloc(&i2c->dev, |
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sizeof(struct tps65912), GFP_KERNEL); |
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if (tps65912 == NULL) |
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return -ENOMEM; |
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i2c_set_clientdata(i2c, tps65912); |
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tps65912->dev = &i2c->dev; |
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tps65912->control_data = i2c; |
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tps65912->read = tps65912_i2c_read; |
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tps65912->write = tps65912_i2c_write; |
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return tps65912_device_init(tps65912); |
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} |
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static int tps65912_i2c_remove(struct i2c_client *i2c) |
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{ |
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struct tps65912 *tps65912 = i2c_get_clientdata(i2c); |
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tps65912_device_exit(tps65912); |
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return 0; |
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} |
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static const struct i2c_device_id tps65912_i2c_id[] = { |
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{"tps65912", 0 }, |
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{ } |
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}; |
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MODULE_DEVICE_TABLE(i2c, tps65912_i2c_id); |
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static struct i2c_driver tps65912_i2c_driver = { |
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.driver = { |
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.name = "tps65912", |
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.owner = THIS_MODULE, |
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}, |
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.probe = tps65912_i2c_probe, |
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.remove = tps65912_i2c_remove, |
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.id_table = tps65912_i2c_id, |
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}; |
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static int __init tps65912_i2c_init(void) |
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{ |
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int ret; |
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ret = i2c_add_driver(&tps65912_i2c_driver); |
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if (ret != 0) |
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pr_err("Failed to register TPS65912 I2C driver: %d\n", ret); |
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return ret; |
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} |
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/* init early so consumer devices can complete system boot */ |
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subsys_initcall(tps65912_i2c_init); |
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static void __exit tps65912_i2c_exit(void) |
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{ |
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i2c_del_driver(&tps65912_i2c_driver); |
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} |
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module_exit(tps65912_i2c_exit); |
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MODULE_AUTHOR("Margarita Olaya <magi@slimlogic.co.uk>"); |
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MODULE_DESCRIPTION("TPS6591x chip family multi-function driver"); |
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MODULE_LICENSE("GPL");
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