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178 lines
4.0 KiB
178 lines
4.0 KiB
/* |
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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 <[email protected]> |
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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 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 const 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 const 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_dev *rdev; |
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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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rdev = devm_regulator_register(&i2c->dev, &isl_rd[i], &config); |
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if (IS_ERR(rdev)) { |
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dev_err(&i2c->dev, "failed to register %s\n", id->name); |
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return PTR_ERR(rdev); |
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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 <[email protected]>"); |
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MODULE_DESCRIPTION("Intersil ISL6271A voltage regulator driver"); |
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MODULE_LICENSE("GPL v2");
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