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/*
* AS3711 PMIC regulator driver, using DCDC Step Down and LDO supplies
*
* Copyright (C) 2012 Renesas Electronics Corporation
* Author: Guennadi Liakhovetski, <g.liakhovetski@gmx.de>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the version 2 of the GNU General Public License as
* published by the Free Software Foundation
*/
#include <linux/err.h>
#include <linux/init.h>
#include <linux/mfd/as3711.h>
#include <linux/module.h>
#include <linux/of.h>
#include <linux/platform_device.h>
#include <linux/regmap.h>
#include <linux/regulator/driver.h>
#include <linux/regulator/of_regulator.h>
#include <linux/slab.h>
struct as3711_regulator_info {
struct regulator_desc desc;
};
struct as3711_regulator {
struct as3711_regulator_info *reg_info;
};
/*
* The regulator API supports 4 modes of operataion: FAST, NORMAL, IDLE and
* STANDBY. We map them in the following way to AS3711 SD1-4 DCDC modes:
* FAST: sdX_fast=1
* NORMAL: low_noise=1
* IDLE: low_noise=0
*/
static int as3711_set_mode_sd(struct regulator_dev *rdev, unsigned int mode)
{
unsigned int fast_bit = rdev->desc->enable_mask,
low_noise_bit = fast_bit << 4;
u8 val;
switch (mode) {
case REGULATOR_MODE_FAST:
val = fast_bit | low_noise_bit;
break;
case REGULATOR_MODE_NORMAL:
val = low_noise_bit;
break;
case REGULATOR_MODE_IDLE:
val = 0;
break;
default:
return -EINVAL;
}
return regmap_update_bits(rdev->regmap, AS3711_SD_CONTROL_1,
low_noise_bit | fast_bit, val);
}
static unsigned int as3711_get_mode_sd(struct regulator_dev *rdev)
{
unsigned int fast_bit = rdev->desc->enable_mask,
low_noise_bit = fast_bit << 4, mask = fast_bit | low_noise_bit;
unsigned int val;
int ret = regmap_read(rdev->regmap, AS3711_SD_CONTROL_1, &val);
if (ret < 0)
return ret;
if ((val & mask) == mask)
return REGULATOR_MODE_FAST;
if ((val & mask) == low_noise_bit)
return REGULATOR_MODE_NORMAL;
if (!(val & mask))
return REGULATOR_MODE_IDLE;
return -EINVAL;
}
static const struct regulator_ops as3711_sd_ops = {
.is_enabled = regulator_is_enabled_regmap,
.enable = regulator_enable_regmap,
.disable = regulator_disable_regmap,
.get_voltage_sel = regulator_get_voltage_sel_regmap,
.set_voltage_sel = regulator_set_voltage_sel_regmap,
.list_voltage = regulator_list_voltage_linear_range,
.map_voltage = regulator_map_voltage_linear_range,
.get_mode = as3711_get_mode_sd,
.set_mode = as3711_set_mode_sd,
};
static const struct regulator_ops as3711_aldo_ops = {
.is_enabled = regulator_is_enabled_regmap,
.enable = regulator_enable_regmap,
.disable = regulator_disable_regmap,
.get_voltage_sel = regulator_get_voltage_sel_regmap,
.set_voltage_sel = regulator_set_voltage_sel_regmap,
.list_voltage = regulator_list_voltage_linear_range,
.map_voltage = regulator_map_voltage_linear_range,
};
static const struct regulator_ops as3711_dldo_ops = {
.is_enabled = regulator_is_enabled_regmap,
.enable = regulator_enable_regmap,
.disable = regulator_disable_regmap,
.get_voltage_sel = regulator_get_voltage_sel_regmap,
.set_voltage_sel = regulator_set_voltage_sel_regmap,
.list_voltage = regulator_list_voltage_linear_range,
.map_voltage = regulator_map_voltage_linear_range,
};
static const struct regulator_linear_range as3711_sd_ranges[] = {
REGULATOR_LINEAR_RANGE(612500, 0x1, 0x40, 12500),
REGULATOR_LINEAR_RANGE(1425000, 0x41, 0x70, 25000),
REGULATOR_LINEAR_RANGE(2650000, 0x71, 0x7f, 50000),
};
static const struct regulator_linear_range as3711_aldo_ranges[] = {
REGULATOR_LINEAR_RANGE(1200000, 0, 0xf, 50000),
REGULATOR_LINEAR_RANGE(1800000, 0x10, 0x1f, 100000),
};
static const struct regulator_linear_range as3711_dldo_ranges[] = {
REGULATOR_LINEAR_RANGE(900000, 0, 0x10, 50000),
REGULATOR_LINEAR_RANGE(1750000, 0x20, 0x3f, 50000),
};
#define AS3711_REG(_id, _en_reg, _en_bit, _vmask, _sfx) \
[AS3711_REGULATOR_ ## _id] = { \
.desc = { \
.name = "as3711-regulator-" # _id, \
.id = AS3711_REGULATOR_ ## _id, \
.n_voltages = (_vmask + 1), \
.ops = &as3711_ ## _sfx ## _ops, \
.type = REGULATOR_VOLTAGE, \
.owner = THIS_MODULE, \
.vsel_reg = AS3711_ ## _id ## _VOLTAGE, \
.vsel_mask = _vmask, \
.enable_reg = AS3711_ ## _en_reg, \
.enable_mask = BIT(_en_bit), \
.linear_ranges = as3711_ ## _sfx ## _ranges, \
.n_linear_ranges = ARRAY_SIZE(as3711_ ## _sfx ## _ranges), \
}, \
}
static struct as3711_regulator_info as3711_reg_info[] = {
AS3711_REG(SD_1, SD_CONTROL, 0, 0x7f, sd),
AS3711_REG(SD_2, SD_CONTROL, 1, 0x7f, sd),
AS3711_REG(SD_3, SD_CONTROL, 2, 0x7f, sd),
AS3711_REG(SD_4, SD_CONTROL, 3, 0x7f, sd),
AS3711_REG(LDO_1, LDO_1_VOLTAGE, 7, 0x1f, aldo),
AS3711_REG(LDO_2, LDO_2_VOLTAGE, 7, 0x1f, aldo),
AS3711_REG(LDO_3, LDO_3_VOLTAGE, 7, 0x3f, dldo),
AS3711_REG(LDO_4, LDO_4_VOLTAGE, 7, 0x3f, dldo),
AS3711_REG(LDO_5, LDO_5_VOLTAGE, 7, 0x3f, dldo),
AS3711_REG(LDO_6, LDO_6_VOLTAGE, 7, 0x3f, dldo),
AS3711_REG(LDO_7, LDO_7_VOLTAGE, 7, 0x3f, dldo),
AS3711_REG(LDO_8, LDO_8_VOLTAGE, 7, 0x3f, dldo),
/* StepUp output voltage depends on supplying regulator */
};
#define AS3711_REGULATOR_NUM ARRAY_SIZE(as3711_reg_info)
static struct of_regulator_match
as3711_regulator_matches[AS3711_REGULATOR_NUM] = {
[AS3711_REGULATOR_SD_1] = { .name = "sd1" },
[AS3711_REGULATOR_SD_2] = { .name = "sd2" },
[AS3711_REGULATOR_SD_3] = { .name = "sd3" },
[AS3711_REGULATOR_SD_4] = { .name = "sd4" },
[AS3711_REGULATOR_LDO_1] = { .name = "ldo1" },
[AS3711_REGULATOR_LDO_2] = { .name = "ldo2" },
[AS3711_REGULATOR_LDO_3] = { .name = "ldo3" },
[AS3711_REGULATOR_LDO_4] = { .name = "ldo4" },
[AS3711_REGULATOR_LDO_5] = { .name = "ldo5" },
[AS3711_REGULATOR_LDO_6] = { .name = "ldo6" },
[AS3711_REGULATOR_LDO_7] = { .name = "ldo7" },
[AS3711_REGULATOR_LDO_8] = { .name = "ldo8" },
};
static int as3711_regulator_parse_dt(struct device *dev,
struct device_node **of_node, const int count)
{
struct as3711_regulator_pdata *pdata = dev_get_platdata(dev);
struct device_node *regulators =
of_get_child_by_name(dev->parent->of_node, "regulators");
struct of_regulator_match *match;
int ret, i;
if (!regulators) {
dev_err(dev, "regulator node not found\n");
return -ENODEV;
}
ret = of_regulator_match(dev->parent, regulators,
as3711_regulator_matches, count);
of_node_put(regulators);
if (ret < 0) {
dev_err(dev, "Error parsing regulator init data: %d\n", ret);
return ret;
}
for (i = 0, match = as3711_regulator_matches; i < count; i++, match++)
if (match->of_node) {
pdata->init_data[i] = match->init_data;
of_node[i] = match->of_node;
}
return 0;
}
static int as3711_regulator_probe(struct platform_device *pdev)
{
struct as3711_regulator_pdata *pdata = dev_get_platdata(&pdev->dev);
struct as3711 *as3711 = dev_get_drvdata(pdev->dev.parent);
struct regulator_config config = {.dev = &pdev->dev,};
struct as3711_regulator *reg = NULL;
struct as3711_regulator *regs;
struct device_node *of_node[AS3711_REGULATOR_NUM] = {};
struct regulator_dev *rdev;
struct as3711_regulator_info *ri;
int ret;
int id;
if (!pdata) {
dev_err(&pdev->dev, "No platform data...\n");
return -ENODEV;
}
if (pdev->dev.parent->of_node) {
ret = as3711_regulator_parse_dt(&pdev->dev, of_node, AS3711_REGULATOR_NUM);
if (ret < 0) {
dev_err(&pdev->dev, "DT parsing failed: %d\n", ret);
return ret;
}
}
regs = devm_kzalloc(&pdev->dev, AS3711_REGULATOR_NUM *
sizeof(struct as3711_regulator), GFP_KERNEL);
if (!regs)
return -ENOMEM;
for (id = 0, ri = as3711_reg_info; id < AS3711_REGULATOR_NUM; ++id, ri++) {
reg = ®s[id];
reg->reg_info = ri;
config.init_data = pdata->init_data[id];
config.driver_data = reg;
config.regmap = as3711->regmap;
config.of_node = of_node[id];
rdev = devm_regulator_register(&pdev->dev, &ri->desc, &config);
if (IS_ERR(rdev)) {
dev_err(&pdev->dev, "Failed to register regulator %s\n",
ri->desc.name);
return PTR_ERR(rdev);
}
}
platform_set_drvdata(pdev, regs);
return 0;
}
static struct platform_driver as3711_regulator_driver = {
.driver = {
.name = "as3711-regulator",
},
.probe = as3711_regulator_probe,
};
static int __init as3711_regulator_init(void)
{
return platform_driver_register(&as3711_regulator_driver);
}
subsys_initcall(as3711_regulator_init);
static void __exit as3711_regulator_exit(void)
{
platform_driver_unregister(&as3711_regulator_driver);
}
module_exit(as3711_regulator_exit);
MODULE_AUTHOR("Guennadi Liakhovetski <g.liakhovetski@gmx.de>");
MODULE_DESCRIPTION("AS3711 regulator driver");
MODULE_ALIAS("platform:as3711-regulator");
MODULE_LICENSE("GPL v2");
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