diff options
Diffstat (limited to 'drivers/regulator/act8865-regulator.c')
| -rw-r--r-- | drivers/regulator/act8865-regulator.c | 349 |
1 files changed, 349 insertions, 0 deletions
diff --git a/drivers/regulator/act8865-regulator.c b/drivers/regulator/act8865-regulator.c new file mode 100644 index 000000000000..084cc0819a52 --- /dev/null +++ b/drivers/regulator/act8865-regulator.c @@ -0,0 +1,349 @@ +/* + * act8865-regulator.c - Voltage regulation for the active-semi ACT8865 + * http://www.active-semi.com/sheets/ACT8865_Datasheet.pdf + * + * Copyright (C) 2013 Atmel Corporation + * + * 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; either version 2 of the License, or + * (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + */ + +#include <linux/module.h> +#include <linux/init.h> +#include <linux/i2c.h> +#include <linux/err.h> +#include <linux/platform_device.h> +#include <linux/regulator/driver.h> +#include <linux/regulator/act8865.h> +#include <linux/of.h> +#include <linux/of_device.h> +#include <linux/regulator/of_regulator.h> +#include <linux/regmap.h> + +/* + * ACT8865 Global Register Map. + */ +#define ACT8865_SYS_MODE 0x00 +#define ACT8865_SYS_CTRL 0x01 +#define ACT8865_DCDC1_VSET1 0x20 +#define ACT8865_DCDC1_VSET2 0x21 +#define ACT8865_DCDC1_CTRL 0x22 +#define ACT8865_DCDC2_VSET1 0x30 +#define ACT8865_DCDC2_VSET2 0x31 +#define ACT8865_DCDC2_CTRL 0x32 +#define ACT8865_DCDC3_VSET1 0x40 +#define ACT8865_DCDC3_VSET2 0x41 +#define ACT8865_DCDC3_CTRL 0x42 +#define ACT8865_LDO1_VSET 0x50 +#define ACT8865_LDO1_CTRL 0x51 +#define ACT8865_LDO2_VSET 0x54 +#define ACT8865_LDO2_CTRL 0x55 +#define ACT8865_LDO3_VSET 0x60 +#define ACT8865_LDO3_CTRL 0x61 +#define ACT8865_LDO4_VSET 0x64 +#define ACT8865_LDO4_CTRL 0x65 + +/* + * Field Definitions. + */ +#define ACT8865_ENA 0x80 /* ON - [7] */ +#define ACT8865_VSEL_MASK 0x3F /* VSET - [5:0] */ + +/* + * ACT8865 voltage number + */ +#define ACT8865_VOLTAGE_NUM 64 + +struct act8865 { + struct regulator_dev *rdev[ACT8865_REG_NUM]; + struct regmap *regmap; +}; + +static const struct regmap_config act8865_regmap_config = { + .reg_bits = 8, + .val_bits = 8, +}; + +static const struct regulator_linear_range act8865_volatge_ranges[] = { + REGULATOR_LINEAR_RANGE(600000, 0, 23, 25000), + REGULATOR_LINEAR_RANGE(1200000, 24, 47, 50000), + REGULATOR_LINEAR_RANGE(2400000, 48, 63, 100000), +}; + +static struct regulator_ops act8865_ops = { + .list_voltage = regulator_list_voltage_linear_range, + .map_voltage = regulator_map_voltage_linear_range, + .get_voltage_sel = regulator_get_voltage_sel_regmap, + .set_voltage_sel = regulator_set_voltage_sel_regmap, + .enable = regulator_enable_regmap, + .disable = regulator_disable_regmap, + .is_enabled = regulator_is_enabled_regmap, +}; + +static const struct regulator_desc act8865_reg[] = { + { + .name = "DCDC_REG1", + .id = ACT8865_ID_DCDC1, + .ops = &act8865_ops, + .type = REGULATOR_VOLTAGE, + .n_voltages = ACT8865_VOLTAGE_NUM, + .linear_ranges = act8865_volatge_ranges, + .n_linear_ranges = ARRAY_SIZE(act8865_volatge_ranges), + .vsel_reg = ACT8865_DCDC1_VSET1, + .vsel_mask = ACT8865_VSEL_MASK, + .enable_reg = ACT8865_DCDC1_CTRL, + .enable_mask = ACT8865_ENA, + .owner = THIS_MODULE, + }, + { + .name = "DCDC_REG2", + .id = ACT8865_ID_DCDC2, + .ops = &act8865_ops, + .type = REGULATOR_VOLTAGE, + .n_voltages = ACT8865_VOLTAGE_NUM, + .linear_ranges = act8865_volatge_ranges, + .n_linear_ranges = ARRAY_SIZE(act8865_volatge_ranges), + .vsel_reg = ACT8865_DCDC2_VSET1, + .vsel_mask = ACT8865_VSEL_MASK, + .enable_reg = ACT8865_DCDC2_CTRL, + .enable_mask = ACT8865_ENA, + .owner = THIS_MODULE, + }, + { + .name = "DCDC_REG3", + .id = ACT8865_ID_DCDC3, + .ops = &act8865_ops, + .type = REGULATOR_VOLTAGE, + .n_voltages = ACT8865_VOLTAGE_NUM, + .linear_ranges = act8865_volatge_ranges, + .n_linear_ranges = ARRAY_SIZE(act8865_volatge_ranges), + .vsel_reg = ACT8865_DCDC3_VSET1, + .vsel_mask = ACT8865_VSEL_MASK, + .enable_reg = ACT8865_DCDC3_CTRL, + .enable_mask = ACT8865_ENA, + .owner = THIS_MODULE, + }, + { + .name = "LDO_REG1", + .id = ACT8865_ID_LDO1, + .ops = &act8865_ops, + .type = REGULATOR_VOLTAGE, + .n_voltages = ACT8865_VOLTAGE_NUM, + .linear_ranges = act8865_volatge_ranges, + .n_linear_ranges = ARRAY_SIZE(act8865_volatge_ranges), + .vsel_reg = ACT8865_LDO1_VSET, + .vsel_mask = ACT8865_VSEL_MASK, + .enable_reg = ACT8865_LDO1_CTRL, + .enable_mask = ACT8865_ENA, + .owner = THIS_MODULE, + }, + { + .name = "LDO_REG2", + .id = ACT8865_ID_LDO2, + .ops = &act8865_ops, + .type = REGULATOR_VOLTAGE, + .n_voltages = ACT8865_VOLTAGE_NUM, + .linear_ranges = act8865_volatge_ranges, + .n_linear_ranges = ARRAY_SIZE(act8865_volatge_ranges), + .vsel_reg = ACT8865_LDO2_VSET, + .vsel_mask = ACT8865_VSEL_MASK, + .enable_reg = ACT8865_LDO2_CTRL, + .enable_mask = ACT8865_ENA, + .owner = THIS_MODULE, + }, + { + .name = "LDO_REG3", + .id = ACT8865_ID_LDO3, + .ops = &act8865_ops, + .type = REGULATOR_VOLTAGE, + .n_voltages = ACT8865_VOLTAGE_NUM, + .linear_ranges = act8865_volatge_ranges, + .n_linear_ranges = ARRAY_SIZE(act8865_volatge_ranges), + .vsel_reg = ACT8865_LDO3_VSET, + .vsel_mask = ACT8865_VSEL_MASK, + .enable_reg = ACT8865_LDO3_CTRL, + .enable_mask = ACT8865_ENA, + .owner = THIS_MODULE, + }, + { + .name = "LDO_REG4", + .id = ACT8865_ID_LDO4, + .ops = &act8865_ops, + .type = REGULATOR_VOLTAGE, + .n_voltages = ACT8865_VOLTAGE_NUM, + .linear_ranges = act8865_volatge_ranges, + .n_linear_ranges = ARRAY_SIZE(act8865_volatge_ranges), + .vsel_reg = ACT8865_LDO4_VSET, + .vsel_mask = ACT8865_VSEL_MASK, + .enable_reg = ACT8865_LDO4_CTRL, + .enable_mask = ACT8865_ENA, + .owner = THIS_MODULE, + }, +}; + +#ifdef CONFIG_OF +static const struct of_device_id act8865_dt_ids[] = { + { .compatible = "active-semi,act8865" }, + { } +}; +MODULE_DEVICE_TABLE(of, act8865_dt_ids); + +static struct of_regulator_match act8865_matches[] = { + [ACT8865_ID_DCDC1] = { .name = "DCDC_REG1"}, + [ACT8865_ID_DCDC2] = { .name = "DCDC_REG2"}, + [ACT8865_ID_DCDC3] = { .name = "DCDC_REG3"}, + [ACT8865_ID_LDO1] = { .name = "LDO_REG1"}, + [ACT8865_ID_LDO2] = { .name = "LDO_REG2"}, + [ACT8865_ID_LDO3] = { .name = "LDO_REG3"}, + [ACT8865_ID_LDO4] = { .name = "LDO_REG4"}, +}; + +static int act8865_pdata_from_dt(struct device *dev, + struct device_node **of_node, + struct act8865_platform_data *pdata) +{ + int matched, i; + struct device_node *np; + struct act8865_regulator_data *regulator; + + np = of_find_node_by_name(dev->of_node, "regulators"); + if (!np) { + dev_err(dev, "missing 'regulators' subnode in DT\n"); + return -EINVAL; + } + + matched = of_regulator_match(dev, np, + act8865_matches, ARRAY_SIZE(act8865_matches)); + if (matched <= 0) + return matched; + + pdata->regulators = devm_kzalloc(dev, + sizeof(struct act8865_regulator_data) * + ARRAY_SIZE(act8865_matches), GFP_KERNEL); + if (!pdata->regulators) { + dev_err(dev, "%s: failed to allocate act8865 registor\n", + __func__); + return -ENOMEM; + } + + pdata->num_regulators = matched; + regulator = pdata->regulators; + + for (i = 0; i < ARRAY_SIZE(act8865_matches); i++) { + regulator->id = i; + regulator->name = act8865_matches[i].name; + regulator->platform_data = act8865_matches[i].init_data; + of_node[i] = act8865_matches[i].of_node; + regulator++; + } + + return 0; +} +#else +static inline int act8865_pdata_from_dt(struct device *dev, + struct device_node **of_node, + struct act8865_platform_data *pdata) +{ + return 0; +} +#endif + +static int act8865_pmic_probe(struct i2c_client *client, + const struct i2c_device_id *i2c_id) +{ + struct regulator_dev **rdev; + struct device *dev = &client->dev; + struct act8865_platform_data *pdata = dev_get_platdata(dev); + struct regulator_config config = { }; + struct act8865 *act8865; + struct device_node *of_node[ACT8865_REG_NUM]; + int i, id; + int ret = -EINVAL; + int error; + + if (dev->of_node && !pdata) { + const struct of_device_id *id; + struct act8865_platform_data pdata_of; + + id = of_match_device(of_match_ptr(act8865_dt_ids), dev); + if (!id) + return -ENODEV; + + ret = act8865_pdata_from_dt(dev, of_node, &pdata_of); + if (ret < 0) + return ret; + + pdata = &pdata_of; + } + + if (pdata->num_regulators > ACT8865_REG_NUM) { + dev_err(dev, "Too many regulators found!\n"); + return -EINVAL; + } + + act8865 = devm_kzalloc(dev, sizeof(struct act8865), GFP_KERNEL); + if (!act8865) + return -ENOMEM; + + rdev = act8865->rdev; + + act8865->regmap = devm_regmap_init_i2c(client, &act8865_regmap_config); + if (IS_ERR(act8865->regmap)) { + error = PTR_ERR(act8865->regmap); + dev_err(&client->dev, "Failed to allocate register map: %d\n", + error); + return error; + } + + /* Finally register devices */ + for (i = 0; i < ACT8865_REG_NUM; i++) { + + id = pdata->regulators[i].id; + + config.dev = dev; + config.init_data = pdata->regulators[i].platform_data; + config.of_node = of_node[i]; + config.driver_data = act8865; + config.regmap = act8865->regmap; + + rdev[i] = devm_regulator_register(&client->dev, + &act8865_reg[i], &config); + if (IS_ERR(rdev[i])) { + dev_err(dev, "failed to register %s\n", + act8865_reg[id].name); + return PTR_ERR(rdev[i]); + } + } + + i2c_set_clientdata(client, act8865); + + return 0; +} + +static const struct i2c_device_id act8865_ids[] = { + { "act8865", 0 }, + { }, +}; +MODULE_DEVICE_TABLE(i2c, act8865_ids); + +static struct i2c_driver act8865_pmic_driver = { + .driver = { + .name = "act8865", + .owner = THIS_MODULE, + }, + .probe = act8865_pmic_probe, + .id_table = act8865_ids, +}; + +module_i2c_driver(act8865_pmic_driver); + +MODULE_DESCRIPTION("active-semi act8865 voltage regulator driver"); +MODULE_AUTHOR("Wenyou Yang <wenyou.yang@atmel.com>"); +MODULE_LICENSE("GPL v2"); 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