ISL6271A voltage regulator support.
This device is very simple, it supports one buck and two LDOs. The LDOs are fixed-voltage. Only the buck is programable over the I2C bus to 16 possible voltages. Signed-off-by: Marek Vasut <marek.vasut@gmail.com> Acked-by: Mark Brown <broonie@opensource.wolfsonmicro.com> Signed-off-by: Liam Girdwood <lrg@slimlogic.co.uk>
This commit is contained in:
Marek Vasut
Liam Girdwood
parent
839b8362a7
commit
51bd6943cd
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@ -201,6 +201,12 @@ config REGULATOR_88PM8607
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help
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This driver supports 88PM8607 voltage regulator chips.
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config REGULATOR_ISL6271A
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tristate "Intersil ISL6271A Power regulator"
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depends on I2C
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help
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This driver supports ISL6271A voltage regulator chip.
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config REGULATOR_AD5398
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tristate "Analog Devices AD5398/AD5821 regulators"
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depends on I2C
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@ -32,5 +32,6 @@ obj-$(CONFIG_REGULATOR_AB3100) += ab3100.o
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obj-$(CONFIG_REGULATOR_TPS65023) += tps65023-regulator.o
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obj-$(CONFIG_REGULATOR_TPS6507X) += tps6507x-regulator.o
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obj-$(CONFIG_REGULATOR_88PM8607) += 88pm8607.o
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obj-$(CONFIG_REGULATOR_ISL6271A) += isl6271a-regulator.o
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ccflags-$(CONFIG_REGULATOR_DEBUG) += -DDEBUG
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@ -0,0 +1,236 @@
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/*
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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/delay.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(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, data;
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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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data = idx;
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goto out;
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}
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/* Convert the data from chip to microvolts */
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data = ISL6271A_VOLTAGE_MIN + (ISL6271A_VOLTAGE_STEP * (idx & 0xf));
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out:
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mutex_unlock(&pmic->mtx);
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return data;
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}
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static int isl6271a_set_voltage(struct regulator_dev *dev, int minuV, int maxuV)
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{
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struct isl_pmic *pmic = rdev_get_drvdata(dev);
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int vsel, err, data;
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if (minuV < ISL6271A_VOLTAGE_MIN || minuV > ISL6271A_VOLTAGE_MAX)
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return -EINVAL;
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if (maxuV < ISL6271A_VOLTAGE_MIN || maxuV > ISL6271A_VOLTAGE_MAX)
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return -EINVAL;
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/* Align to 50000 mV */
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vsel = minuV - (minuV % ISL6271A_VOLTAGE_STEP);
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/* If the result fell out of [minuV,maxuV] range, put it back */
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if (vsel < minuV)
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vsel += ISL6271A_VOLTAGE_STEP;
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/* Convert the microvolts to data for the chip */
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data = (vsel - ISL6271A_VOLTAGE_MIN) / ISL6271A_VOLTAGE_STEP;
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mutex_lock(&pmic->mtx);
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err = i2c_smbus_write_byte(pmic->client, data);
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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 int isl6271a_list_voltage(struct regulator_dev *dev, unsigned selector)
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{
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return ISL6271A_VOLTAGE_MIN + (ISL6271A_VOLTAGE_STEP * selector);
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}
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static struct regulator_ops isl_core_ops = {
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.get_voltage = isl6271a_get_voltage,
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.set_voltage = isl6271a_set_voltage,
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.list_voltage = isl6271a_list_voltage,
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};
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static int isl6271a_get_fixed_voltage(struct regulator_dev *dev)
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{
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int id = rdev_get_id(dev);
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return (id == 1) ? 1100000 : 1300000;
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}
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static int isl6271a_list_fixed_voltage(struct regulator_dev *dev, unsigned selector)
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{
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int id = rdev_get_id(dev);
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return (id == 1) ? 1100000 : 1300000;
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}
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static struct regulator_ops isl_fixed_ops = {
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.get_voltage = isl6271a_get_fixed_voltage,
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.list_voltage = isl6271a_list_fixed_voltage,
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};
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static 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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}, {
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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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}, {
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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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},
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};
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static int __devinit 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_init_data *init_data = i2c->dev.platform_data;
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struct isl_pmic *pmic;
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int err, 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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if (!init_data) {
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dev_err(&i2c->dev, "no platform data supplied\n");
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return -EIO;
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}
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pmic = kzalloc(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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pmic->rdev[i] = regulator_register(&isl_rd[0], &i2c->dev,
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init_data, pmic);
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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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err = PTR_ERR(pmic->rdev);
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goto error;
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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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error:
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while (--i >= 0)
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regulator_unregister(pmic->rdev[i]);
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kfree(pmic);
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return err;
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}
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static int __devexit isl6271a_remove(struct i2c_client *i2c)
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{
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struct isl_pmic *pmic = i2c_get_clientdata(i2c);
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int i;
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i2c_set_clientdata(i2c, NULL);
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for (i = 0; i < 3; i++)
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regulator_unregister(pmic->rdev[i]);
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kfree(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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.owner = THIS_MODULE,
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},
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.probe = isl6271a_probe,
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.remove = __devexit_p(isl6271a_remove),
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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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