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