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drivers/regulator/isl6271a-regulator.c
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/* * isl6271a-regulator.c * * Support for Intersil ISL6271A voltage regulator * * Copyright (C) 2010 Marek Vasut <marek.vasut@gmail.com> * * 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 version 2. * * This program is distributed "as is" WITHOUT ANY WARRANTY of any kind, * whether express or implied; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU * General Public License for more details. */ #include <linux/kernel.h> #include <linux/module.h> #include <linux/init.h> #include <linux/err.h> #include <linux/platform_device.h> #include <linux/regulator/driver.h> #include <linux/i2c.h> #include <linux/delay.h> #include <linux/slab.h> #define ISL6271A_VOLTAGE_MIN 850000 #define ISL6271A_VOLTAGE_MAX 1600000 #define ISL6271A_VOLTAGE_STEP 50000 /* PMIC details */ struct isl_pmic { struct i2c_client *client; struct regulator_dev *rdev[3]; struct mutex mtx; }; static int isl6271a_get_voltage(struct regulator_dev *dev) { struct isl_pmic *pmic = rdev_get_drvdata(dev); int idx, data; mutex_lock(&pmic->mtx); idx = i2c_smbus_read_byte(pmic->client); if (idx < 0) { dev_err(&pmic->client->dev, "Error getting voltage "); data = idx; goto out; } /* Convert the data from chip to microvolts */ data = ISL6271A_VOLTAGE_MIN + (ISL6271A_VOLTAGE_STEP * (idx & 0xf)); out: mutex_unlock(&pmic->mtx); return data; } |
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static int isl6271a_set_voltage(struct regulator_dev *dev, int minuV, int maxuV, unsigned *selector) |
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{ struct isl_pmic *pmic = rdev_get_drvdata(dev); int vsel, err, data; if (minuV < ISL6271A_VOLTAGE_MIN || minuV > ISL6271A_VOLTAGE_MAX) return -EINVAL; if (maxuV < ISL6271A_VOLTAGE_MIN || maxuV > ISL6271A_VOLTAGE_MAX) return -EINVAL; /* Align to 50000 mV */ vsel = minuV - (minuV % ISL6271A_VOLTAGE_STEP); /* If the result fell out of [minuV,maxuV] range, put it back */ if (vsel < minuV) vsel += ISL6271A_VOLTAGE_STEP; /* Convert the microvolts to data for the chip */ data = (vsel - ISL6271A_VOLTAGE_MIN) / ISL6271A_VOLTAGE_STEP; |
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*selector = data; |
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mutex_lock(&pmic->mtx); err = i2c_smbus_write_byte(pmic->client, data); if (err < 0) dev_err(&pmic->client->dev, "Error setting voltage "); mutex_unlock(&pmic->mtx); return err; } static int isl6271a_list_voltage(struct regulator_dev *dev, unsigned selector) { return ISL6271A_VOLTAGE_MIN + (ISL6271A_VOLTAGE_STEP * selector); } static struct regulator_ops isl_core_ops = { .get_voltage = isl6271a_get_voltage, .set_voltage = isl6271a_set_voltage, .list_voltage = isl6271a_list_voltage, }; static int isl6271a_get_fixed_voltage(struct regulator_dev *dev) { int id = rdev_get_id(dev); return (id == 1) ? 1100000 : 1300000; } static int isl6271a_list_fixed_voltage(struct regulator_dev *dev, unsigned selector) { int id = rdev_get_id(dev); return (id == 1) ? 1100000 : 1300000; } static struct regulator_ops isl_fixed_ops = { .get_voltage = isl6271a_get_fixed_voltage, .list_voltage = isl6271a_list_fixed_voltage, }; static struct regulator_desc isl_rd[] = { { .name = "Core Buck", .id = 0, .n_voltages = 16, .ops = &isl_core_ops, .type = REGULATOR_VOLTAGE, .owner = THIS_MODULE, }, { .name = "LDO1", .id = 1, .n_voltages = 1, .ops = &isl_fixed_ops, .type = REGULATOR_VOLTAGE, .owner = THIS_MODULE, }, { .name = "LDO2", .id = 2, .n_voltages = 1, .ops = &isl_fixed_ops, .type = REGULATOR_VOLTAGE, .owner = THIS_MODULE, }, }; static int __devinit isl6271a_probe(struct i2c_client *i2c, const struct i2c_device_id *id) { struct regulator_init_data *init_data = i2c->dev.platform_data; struct isl_pmic *pmic; int err, i; if (!i2c_check_functionality(i2c->adapter, I2C_FUNC_SMBUS_BYTE_DATA)) return -EIO; if (!init_data) { dev_err(&i2c->dev, "no platform data supplied "); return -EIO; } pmic = kzalloc(sizeof(struct isl_pmic), GFP_KERNEL); if (!pmic) return -ENOMEM; pmic->client = i2c; mutex_init(&pmic->mtx); for (i = 0; i < 3; i++) { |
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pmic->rdev[i] = regulator_register(&isl_rd[i], &i2c->dev, |
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init_data, pmic); if (IS_ERR(pmic->rdev[i])) { dev_err(&i2c->dev, "failed to register %s ", id->name); |
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err = PTR_ERR(pmic->rdev[i]); |
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goto error; } } i2c_set_clientdata(i2c, pmic); return 0; error: while (--i >= 0) regulator_unregister(pmic->rdev[i]); kfree(pmic); return err; } static int __devexit isl6271a_remove(struct i2c_client *i2c) { struct isl_pmic *pmic = i2c_get_clientdata(i2c); int i; |
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for (i = 0; i < 3; i++) regulator_unregister(pmic->rdev[i]); kfree(pmic); return 0; } static const struct i2c_device_id isl6271a_id[] = { {.name = "isl6271a", 0 }, { }, }; MODULE_DEVICE_TABLE(i2c, isl6271a_id); static struct i2c_driver isl6271a_i2c_driver = { .driver = { .name = "isl6271a", .owner = THIS_MODULE, }, .probe = isl6271a_probe, .remove = __devexit_p(isl6271a_remove), .id_table = isl6271a_id, }; static int __init isl6271a_init(void) { return i2c_add_driver(&isl6271a_i2c_driver); } static void __exit isl6271a_cleanup(void) { i2c_del_driver(&isl6271a_i2c_driver); } subsys_initcall(isl6271a_init); module_exit(isl6271a_cleanup); MODULE_AUTHOR("Marek Vasut <marek.vasut@gmail.com>"); MODULE_DESCRIPTION("Intersil ISL6271A voltage regulator driver"); MODULE_LICENSE("GPL v2"); |