180 lines
4.1 KiB
C
180 lines
4.1 KiB
C
/*
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* isl6271a-regulator.c
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*
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* Support for Intersil ISL6271A voltage regulator
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*
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* Copyright (C) 2010 Marek Vasut <marek.vasut@gmail.com>
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License as
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* published by the Free Software Foundation version 2.
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*
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* This program is distributed "as is" WITHOUT ANY WARRANTY of any kind,
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* whether express or implied; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*/
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/init.h>
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#include <linux/err.h>
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#include <linux/platform_device.h>
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#include <linux/regulator/driver.h>
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#include <linux/i2c.h>
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#include <linux/slab.h>
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#define ISL6271A_VOLTAGE_MIN 850000
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#define ISL6271A_VOLTAGE_MAX 1600000
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#define ISL6271A_VOLTAGE_STEP 50000
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/* PMIC details */
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struct isl_pmic {
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struct i2c_client *client;
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struct regulator_dev *rdev[3];
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struct mutex mtx;
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};
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static int isl6271a_get_voltage_sel(struct regulator_dev *dev)
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{
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struct isl_pmic *pmic = rdev_get_drvdata(dev);
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int idx;
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mutex_lock(&pmic->mtx);
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idx = i2c_smbus_read_byte(pmic->client);
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if (idx < 0)
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dev_err(&pmic->client->dev, "Error getting voltage\n");
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mutex_unlock(&pmic->mtx);
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return idx;
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}
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static int isl6271a_set_voltage_sel(struct regulator_dev *dev,
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unsigned selector)
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{
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struct isl_pmic *pmic = rdev_get_drvdata(dev);
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int err;
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mutex_lock(&pmic->mtx);
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err = i2c_smbus_write_byte(pmic->client, selector);
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if (err < 0)
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dev_err(&pmic->client->dev, "Error setting voltage\n");
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mutex_unlock(&pmic->mtx);
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return err;
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}
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static struct regulator_ops isl_core_ops = {
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.get_voltage_sel = isl6271a_get_voltage_sel,
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.set_voltage_sel = isl6271a_set_voltage_sel,
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.list_voltage = regulator_list_voltage_linear,
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.map_voltage = regulator_map_voltage_linear,
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};
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static struct regulator_ops isl_fixed_ops = {
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.list_voltage = regulator_list_voltage_linear,
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};
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static const struct regulator_desc isl_rd[] = {
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{
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.name = "Core Buck",
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.id = 0,
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.n_voltages = 16,
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.ops = &isl_core_ops,
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.type = REGULATOR_VOLTAGE,
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.owner = THIS_MODULE,
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.min_uV = ISL6271A_VOLTAGE_MIN,
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.uV_step = ISL6271A_VOLTAGE_STEP,
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}, {
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.name = "LDO1",
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.id = 1,
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.n_voltages = 1,
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.ops = &isl_fixed_ops,
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.type = REGULATOR_VOLTAGE,
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.owner = THIS_MODULE,
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.min_uV = 1100000,
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}, {
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.name = "LDO2",
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.id = 2,
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.n_voltages = 1,
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.ops = &isl_fixed_ops,
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.type = REGULATOR_VOLTAGE,
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.owner = THIS_MODULE,
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.min_uV = 1300000,
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},
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};
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static int isl6271a_probe(struct i2c_client *i2c,
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const struct i2c_device_id *id)
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{
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struct regulator_config config = { };
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struct regulator_init_data *init_data = dev_get_platdata(&i2c->dev);
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struct isl_pmic *pmic;
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int i;
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if (!i2c_check_functionality(i2c->adapter, I2C_FUNC_SMBUS_BYTE_DATA))
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return -EIO;
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pmic = devm_kzalloc(&i2c->dev, sizeof(struct isl_pmic), GFP_KERNEL);
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if (!pmic)
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return -ENOMEM;
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pmic->client = i2c;
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mutex_init(&pmic->mtx);
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for (i = 0; i < 3; i++) {
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config.dev = &i2c->dev;
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if (i == 0)
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config.init_data = init_data;
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else
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config.init_data = NULL;
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config.driver_data = pmic;
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pmic->rdev[i] = devm_regulator_register(&i2c->dev, &isl_rd[i],
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&config);
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if (IS_ERR(pmic->rdev[i])) {
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dev_err(&i2c->dev, "failed to register %s\n", id->name);
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return PTR_ERR(pmic->rdev[i]);
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}
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}
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i2c_set_clientdata(i2c, pmic);
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return 0;
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}
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static const struct i2c_device_id isl6271a_id[] = {
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{.name = "isl6271a", 0 },
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{ },
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};
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MODULE_DEVICE_TABLE(i2c, isl6271a_id);
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static struct i2c_driver isl6271a_i2c_driver = {
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.driver = {
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.name = "isl6271a",
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},
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.probe = isl6271a_probe,
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.id_table = isl6271a_id,
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};
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static int __init isl6271a_init(void)
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{
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return i2c_add_driver(&isl6271a_i2c_driver);
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}
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static void __exit isl6271a_cleanup(void)
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{
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i2c_del_driver(&isl6271a_i2c_driver);
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}
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subsys_initcall(isl6271a_init);
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module_exit(isl6271a_cleanup);
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MODULE_AUTHOR("Marek Vasut <marek.vasut@gmail.com>");
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MODULE_DESCRIPTION("Intersil ISL6271A voltage regulator driver");
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MODULE_LICENSE("GPL v2");
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