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/*
* Copyright (C) 2011 Freescale Semiconductor, Inc. All Rights Reserved.
*/
/*
* 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.
* You should have received a copy of the GNU General Public License along
* with this program; if not, write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
#include <linux/slab.h>
#include <linux/device.h>
#include <linux/module.h>
#include <linux/err.h>
#include <linux/io.h>
#include <linux/platform_device.h>
#include <linux/of.h>
#include <linux/of_address.h>
#include <linux/mfd/anatop.h>
#include <linux/regulator/driver.h>
#include <linux/regulator/of_regulator.h>
struct anatop_regulator {
const char *name;
u32 control_reg;
struct anatop *mfd;
int vol_bit_shift;
int vol_bit_width;
int min_bit_val;
int min_voltage;
int max_voltage;
struct regulator_desc rdesc;
struct regulator_init_data *initdata;
};
static int anatop_set_voltage(struct regulator_dev *reg, int min_uV,
int max_uV, unsigned *selector)
{
struct anatop_regulator *anatop_reg = rdev_get_drvdata(reg);
u32 val, sel, mask;
int uv;
uv = min_uV;
dev_dbg(®->dev, "%s: uv %d, min %d, max %d\n", __func__,
uv, anatop_reg->min_voltage,
anatop_reg->max_voltage);
if (uv < anatop_reg->min_voltage) {
if (max_uV > anatop_reg->min_voltage)
uv = anatop_reg->min_voltage;
else
return -EINVAL;
}
if (!anatop_reg->control_reg)
return -ENOTSUPP;
sel = DIV_ROUND_UP(uv - anatop_reg->min_voltage, 25000);
if (sel * 25000 + anatop_reg->min_voltage > anatop_reg->max_voltage)
return -EINVAL;
val = anatop_reg->min_bit_val + sel;
*selector = sel;
dev_dbg(®->dev, "%s: calculated val %d\n", __func__, val);
mask = ((1 << anatop_reg->vol_bit_width) - 1) <<
anatop_reg->vol_bit_shift;
val <<= anatop_reg->vol_bit_shift;
anatop_write_reg(anatop_reg->mfd, anatop_reg->control_reg, val, mask);
return 0;
}
static int anatop_get_voltage_sel(struct regulator_dev *reg)
{
struct anatop_regulator *anatop_reg = rdev_get_drvdata(reg);
u32 val;
if (!anatop_reg->control_reg)
return -ENOTSUPP;
val = anatop_read_reg(anatop_reg->mfd, anatop_reg->control_reg);
val = (val & ((1 << anatop_reg->vol_bit_width) - 1)) >>
anatop_reg->vol_bit_shift;
return val - anatop_reg->min_bit_val;
}
static int anatop_list_voltage(struct regulator_dev *reg, unsigned selector)
{
struct anatop_regulator *anatop_reg = rdev_get_drvdata(reg);
int uv;
uv = anatop_reg->min_voltage + selector * 25000;
dev_dbg(®->dev, "vddio = %d, selector = %u\n", uv, selector);
return uv;
}
static struct regulator_ops anatop_rops = {
.set_voltage = anatop_set_voltage,
.get_voltage_sel = anatop_get_voltage_sel,
.list_voltage = anatop_list_voltage,
};
static int __devinit anatop_regulator_probe(struct platform_device *pdev)
{
struct device *dev = &pdev->dev;
struct device_node *np = dev->of_node;
struct regulator_desc *rdesc;
struct regulator_dev *rdev;
struct anatop_regulator *sreg;
struct regulator_init_data *initdata;
struct anatop *anatopmfd = dev_get_drvdata(pdev->dev.parent);
struct regulator_config config = { };
int ret = 0;
initdata = of_get_regulator_init_data(dev, np);
sreg = devm_kzalloc(dev, sizeof(*sreg), GFP_KERNEL);
if (!sreg)
return -ENOMEM;
sreg->initdata = initdata;
sreg->name = kstrdup(of_get_property(np, "regulator-name", NULL),
GFP_KERNEL);
rdesc = &sreg->rdesc;
memset(rdesc, 0, sizeof(*rdesc));
rdesc->name = sreg->name;
rdesc->ops = &anatop_rops;
rdesc->type = REGULATOR_VOLTAGE;
rdesc->owner = THIS_MODULE;
sreg->mfd = anatopmfd;
ret = of_property_read_u32(np, "anatop-reg-offset",
&sreg->control_reg);
if (ret) {
dev_err(dev, "no anatop-reg-offset property set\n");
goto anatop_probe_end;
}
ret = of_property_read_u32(np, "anatop-vol-bit-width",
&sreg->vol_bit_width);
if (ret) {
dev_err(dev, "no anatop-vol-bit-width property set\n");
goto anatop_probe_end;
}
ret = of_property_read_u32(np, "anatop-vol-bit-shift",
&sreg->vol_bit_shift);
if (ret) {
dev_err(dev, "no anatop-vol-bit-shift property set\n");
goto anatop_probe_end;
}
ret = of_property_read_u32(np, "anatop-min-bit-val",
&sreg->min_bit_val);
if (ret) {
dev_err(dev, "no anatop-min-bit-val property set\n");
goto anatop_probe_end;
}
ret = of_property_read_u32(np, "anatop-min-voltage",
&sreg->min_voltage);
if (ret) {
dev_err(dev, "no anatop-min-voltage property set\n");
goto anatop_probe_end;
}
ret = of_property_read_u32(np, "anatop-max-voltage",
&sreg->max_voltage);
if (ret) {
dev_err(dev, "no anatop-max-voltage property set\n");
goto anatop_probe_end;
}
rdesc->n_voltages = (sreg->max_voltage - sreg->min_voltage)
/ 25000 + 1;
config.dev = &pdev->dev;
config.init_data = initdata;
config.driver_data = sreg;
config.of_node = pdev->dev.of_node;
/* register regulator */
rdev = regulator_register(rdesc, &config);
if (IS_ERR(rdev)) {
dev_err(dev, "failed to register %s\n",
rdesc->name);
ret = PTR_ERR(rdev);
goto anatop_probe_end;
}
platform_set_drvdata(pdev, rdev);
anatop_probe_end:
if (ret)
kfree(sreg->name);
return ret;
}
static int __devexit anatop_regulator_remove(struct platform_device *pdev)
{
struct regulator_dev *rdev = platform_get_drvdata(pdev);
struct anatop_regulator *sreg = rdev_get_drvdata(rdev);
const char *name = sreg->name;
regulator_unregister(rdev);
kfree(name);
return 0;
}
static struct of_device_id __devinitdata of_anatop_regulator_match_tbl[] = {
{ .compatible = "fsl,anatop-regulator", },
{ /* end */ }
};
static struct platform_driver anatop_regulator_driver = {
.driver = {
.name = "anatop_regulator",
.owner = THIS_MODULE,
.of_match_table = of_anatop_regulator_match_tbl,
},
.probe = anatop_regulator_probe,
.remove = __devexit_p(anatop_regulator_remove),
};
static int __init anatop_regulator_init(void)
{
return platform_driver_register(&anatop_regulator_driver);
}
postcore_initcall(anatop_regulator_init);
static void __exit anatop_regulator_exit(void)
{
platform_driver_unregister(&anatop_regulator_driver);
}
module_exit(anatop_regulator_exit);
MODULE_AUTHOR("Nancy Chen <Nancy.Chen@freescale.com>, "
"Ying-Chun Liu (PaulLiu) <paul.liu@linaro.org>");
MODULE_DESCRIPTION("ANATOP Regulator driver");
MODULE_LICENSE("GPL v2");
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