cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
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isl6271a-regulator.c (4145B)

      1/*
      2 * isl6271a-regulator.c
      3 *
      4 * Support for Intersil ISL6271A voltage regulator
      5 *
      6 * Copyright (C) 2010 Marek Vasut <marek.vasut@gmail.com>
      7 *
      8 * This program is free software; you can redistribute it and/or
      9 * modify it under the terms of the GNU General Public License as
     10 * published by the Free Software Foundation version 2.
     11 *
     12 * This program is distributed "as is" WITHOUT ANY WARRANTY of any kind,
     13 * whether express or implied; without even the implied warranty of
     14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
     15 * General Public License for more details.
     16 */
     17
     18#include <linux/kernel.h>
     19#include <linux/module.h>
     20#include <linux/init.h>
     21#include <linux/err.h>
     22#include <linux/platform_device.h>
     23#include <linux/regulator/driver.h>
     24#include <linux/i2c.h>
     25#include <linux/slab.h>
     26
     27#define	ISL6271A_VOLTAGE_MIN	850000
     28#define	ISL6271A_VOLTAGE_MAX	1600000
     29#define	ISL6271A_VOLTAGE_STEP	50000
     30
     31/* PMIC details */
     32struct isl_pmic {
     33	struct i2c_client	*client;
     34	struct mutex		mtx;
     35};
     36
     37static int isl6271a_get_voltage_sel(struct regulator_dev *dev)
     38{
     39	struct isl_pmic *pmic = rdev_get_drvdata(dev);
     40	int idx;
     41
     42	mutex_lock(&pmic->mtx);
     43
     44	idx = i2c_smbus_read_byte(pmic->client);
     45	if (idx < 0)
     46		dev_err(&pmic->client->dev, "Error getting voltage\n");
     47
     48	mutex_unlock(&pmic->mtx);
     49	return idx;
     50}
     51
     52static int isl6271a_set_voltage_sel(struct regulator_dev *dev,
     53				    unsigned selector)
     54{
     55	struct isl_pmic *pmic = rdev_get_drvdata(dev);
     56	int err;
     57
     58	mutex_lock(&pmic->mtx);
     59
     60	err = i2c_smbus_write_byte(pmic->client, selector);
     61	if (err < 0)
     62		dev_err(&pmic->client->dev, "Error setting voltage\n");
     63
     64	mutex_unlock(&pmic->mtx);
     65	return err;
     66}
     67
     68static const struct regulator_ops isl_core_ops = {
     69	.get_voltage_sel = isl6271a_get_voltage_sel,
     70	.set_voltage_sel = isl6271a_set_voltage_sel,
     71	.list_voltage	= regulator_list_voltage_linear,
     72	.map_voltage	= regulator_map_voltage_linear,
     73};
     74
     75static const struct regulator_ops isl_fixed_ops = {
     76	.list_voltage	= regulator_list_voltage_linear,
     77};
     78
     79static const struct regulator_desc isl_rd[] = {
     80	{
     81		.name		= "Core Buck",
     82		.id		= 0,
     83		.n_voltages	= 16,
     84		.ops		= &isl_core_ops,
     85		.type		= REGULATOR_VOLTAGE,
     86		.owner		= THIS_MODULE,
     87		.min_uV		= ISL6271A_VOLTAGE_MIN,
     88		.uV_step	= ISL6271A_VOLTAGE_STEP,
     89	}, {
     90		.name		= "LDO1",
     91		.id		= 1,
     92		.n_voltages	= 1,
     93		.ops		= &isl_fixed_ops,
     94		.type		= REGULATOR_VOLTAGE,
     95		.owner		= THIS_MODULE,
     96		.min_uV		= 1100000,
     97	}, {
     98		.name		= "LDO2",
     99		.id		= 2,
    100		.n_voltages	= 1,
    101		.ops		= &isl_fixed_ops,
    102		.type		= REGULATOR_VOLTAGE,
    103		.owner		= THIS_MODULE,
    104		.min_uV		= 1300000,
    105	},
    106};
    107
    108static int isl6271a_probe(struct i2c_client *i2c,
    109				     const struct i2c_device_id *id)
    110{
    111	struct regulator_dev *rdev;
    112	struct regulator_config config = { };
    113	struct regulator_init_data *init_data	= dev_get_platdata(&i2c->dev);
    114	struct isl_pmic *pmic;
    115	int i;
    116
    117	if (!i2c_check_functionality(i2c->adapter, I2C_FUNC_SMBUS_BYTE_DATA))
    118		return -EIO;
    119
    120	pmic = devm_kzalloc(&i2c->dev, sizeof(struct isl_pmic), GFP_KERNEL);
    121	if (!pmic)
    122		return -ENOMEM;
    123
    124	pmic->client = i2c;
    125
    126	mutex_init(&pmic->mtx);
    127
    128	for (i = 0; i < 3; i++) {
    129		config.dev = &i2c->dev;
    130		if (i == 0)
    131			config.init_data = init_data;
    132		else
    133			config.init_data = NULL;
    134		config.driver_data = pmic;
    135
    136		rdev = devm_regulator_register(&i2c->dev, &isl_rd[i], &config);
    137		if (IS_ERR(rdev)) {
    138			dev_err(&i2c->dev, "failed to register %s\n", id->name);
    139			return PTR_ERR(rdev);
    140		}
    141	}
    142
    143	i2c_set_clientdata(i2c, pmic);
    144
    145	return 0;
    146}
    147
    148static const struct i2c_device_id isl6271a_id[] = {
    149	{.name = "isl6271a", 0 },
    150	{ },
    151};
    152
    153MODULE_DEVICE_TABLE(i2c, isl6271a_id);
    154
    155static struct i2c_driver isl6271a_i2c_driver = {
    156	.driver = {
    157		.name = "isl6271a",
    158	},
    159	.probe = isl6271a_probe,
    160	.id_table = isl6271a_id,
    161};
    162
    163static int __init isl6271a_init(void)
    164{
    165	return i2c_add_driver(&isl6271a_i2c_driver);
    166}
    167
    168static void __exit isl6271a_cleanup(void)
    169{
    170	i2c_del_driver(&isl6271a_i2c_driver);
    171}
    172
    173subsys_initcall(isl6271a_init);
    174module_exit(isl6271a_cleanup);
    175
    176MODULE_AUTHOR("Marek Vasut <marek.vasut@gmail.com>");
    177MODULE_DESCRIPTION("Intersil ISL6271A voltage regulator driver");
    178MODULE_LICENSE("GPL v2");