diff options
Diffstat (limited to 'drivers/regulator/isl6271a-regulator.c')
| -rw-r--r-- | drivers/regulator/isl6271a-regulator.c | 180 |
1 files changed, 180 insertions, 0 deletions
diff --git a/drivers/regulator/isl6271a-regulator.c b/drivers/regulator/isl6271a-regulator.c new file mode 100644 index 000000000..6e5da95fa --- /dev/null +++ b/drivers/regulator/isl6271a-regulator.c @@ -0,0 +1,180 @@ +/* + * 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/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_sel(struct regulator_dev *dev) +{ + struct isl_pmic *pmic = rdev_get_drvdata(dev); + int idx; + + mutex_lock(&pmic->mtx); + + idx = i2c_smbus_read_byte(pmic->client); + if (idx < 0) + dev_err(&pmic->client->dev, "Error getting voltage\n"); + + mutex_unlock(&pmic->mtx); + return idx; +} + +static int isl6271a_set_voltage_sel(struct regulator_dev *dev, + unsigned selector) +{ + struct isl_pmic *pmic = rdev_get_drvdata(dev); + int err; + + mutex_lock(&pmic->mtx); + + err = i2c_smbus_write_byte(pmic->client, selector); + if (err < 0) + dev_err(&pmic->client->dev, "Error setting voltage\n"); + + mutex_unlock(&pmic->mtx); + return err; +} + +static struct regulator_ops isl_core_ops = { + .get_voltage_sel = isl6271a_get_voltage_sel, + .set_voltage_sel = isl6271a_set_voltage_sel, + .list_voltage = regulator_list_voltage_linear, + .map_voltage = regulator_map_voltage_linear, +}; + +static struct regulator_ops isl_fixed_ops = { + .list_voltage = regulator_list_voltage_linear, +}; + +static const struct regulator_desc isl_rd[] = { + { + .name = "Core Buck", + .id = 0, + .n_voltages = 16, + .ops = &isl_core_ops, + .type = REGULATOR_VOLTAGE, + .owner = THIS_MODULE, + .min_uV = ISL6271A_VOLTAGE_MIN, + .uV_step = ISL6271A_VOLTAGE_STEP, + }, { + .name = "LDO1", + .id = 1, + .n_voltages = 1, + .ops = &isl_fixed_ops, + .type = REGULATOR_VOLTAGE, + .owner = THIS_MODULE, + .min_uV = 1100000, + }, { + .name = "LDO2", + .id = 2, + .n_voltages = 1, + .ops = &isl_fixed_ops, + .type = REGULATOR_VOLTAGE, + .owner = THIS_MODULE, + .min_uV = 1300000, + }, +}; + +static int isl6271a_probe(struct i2c_client *i2c, + const struct i2c_device_id *id) +{ + struct regulator_config config = { }; + struct regulator_init_data *init_data = dev_get_platdata(&i2c->dev); + struct isl_pmic *pmic; + int i; + + if (!i2c_check_functionality(i2c->adapter, I2C_FUNC_SMBUS_BYTE_DATA)) + return -EIO; + + pmic = devm_kzalloc(&i2c->dev, sizeof(struct isl_pmic), GFP_KERNEL); + if (!pmic) + return -ENOMEM; + + pmic->client = i2c; + + mutex_init(&pmic->mtx); + + for (i = 0; i < 3; i++) { + config.dev = &i2c->dev; + if (i == 0) + config.init_data = init_data; + else + config.init_data = NULL; + config.driver_data = pmic; + + pmic->rdev[i] = devm_regulator_register(&i2c->dev, &isl_rd[i], + &config); + if (IS_ERR(pmic->rdev[i])) { + dev_err(&i2c->dev, "failed to register %s\n", id->name); + return PTR_ERR(pmic->rdev[i]); + } + } + + i2c_set_clientdata(i2c, 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, + .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"); |