328 строки
8.5 KiB
C
328 строки
8.5 KiB
C
/*
|
|
* max1586.c -- Voltage and current regulation for the Maxim 1586
|
|
*
|
|
* Copyright (C) 2008 Robert Jarzmik
|
|
*
|
|
* 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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
|
|
*/
|
|
#include <linux/module.h>
|
|
#include <linux/err.h>
|
|
#include <linux/i2c.h>
|
|
#include <linux/platform_device.h>
|
|
#include <linux/regulator/driver.h>
|
|
#include <linux/slab.h>
|
|
#include <linux/regulator/max1586.h>
|
|
#include <linux/of_device.h>
|
|
#include <linux/regulator/of_regulator.h>
|
|
|
|
#define MAX1586_V3_MAX_VSEL 31
|
|
#define MAX1586_V6_MAX_VSEL 3
|
|
|
|
#define MAX1586_V3_MIN_UV 700000
|
|
#define MAX1586_V3_MAX_UV 1475000
|
|
|
|
#define MAX1586_V6_MIN_UV 0
|
|
#define MAX1586_V6_MAX_UV 3000000
|
|
|
|
#define I2C_V3_SELECT (0 << 5)
|
|
#define I2C_V6_SELECT (1 << 5)
|
|
|
|
struct max1586_data {
|
|
struct i2c_client *client;
|
|
|
|
/* min/max V3 voltage */
|
|
unsigned int min_uV;
|
|
unsigned int max_uV;
|
|
|
|
unsigned int v3_curr_sel;
|
|
unsigned int v6_curr_sel;
|
|
};
|
|
|
|
/*
|
|
* V6 voltage
|
|
* On I2C bus, sending a "x" byte to the max1586 means :
|
|
* set V6 to either 0V, 1.8V, 2.5V, 3V depending on (x & 0x3)
|
|
* As regulator framework doesn't accept voltages to be 0V, we use 1uV.
|
|
*/
|
|
static const unsigned int v6_voltages_uv[] = { 1, 1800000, 2500000, 3000000 };
|
|
|
|
/*
|
|
* V3 voltage
|
|
* On I2C bus, sending a "x" byte to the max1586 means :
|
|
* set V3 to 0.700V + (x & 0x1f) * 0.025V
|
|
* This voltage can be increased by external resistors
|
|
* R24 and R25=100kOhm as described in the data sheet.
|
|
* The gain is approximately: 1 + R24/R25 + R24/185.5kOhm
|
|
*/
|
|
static int max1586_v3_get_voltage_sel(struct regulator_dev *rdev)
|
|
{
|
|
struct max1586_data *max1586 = rdev_get_drvdata(rdev);
|
|
|
|
return max1586->v3_curr_sel;
|
|
}
|
|
|
|
static int max1586_v3_set_voltage_sel(struct regulator_dev *rdev,
|
|
unsigned selector)
|
|
{
|
|
struct max1586_data *max1586 = rdev_get_drvdata(rdev);
|
|
struct i2c_client *client = max1586->client;
|
|
int ret;
|
|
u8 v3_prog;
|
|
|
|
dev_dbg(&client->dev, "changing voltage v3 to %dmv\n",
|
|
regulator_list_voltage_linear(rdev, selector) / 1000);
|
|
|
|
v3_prog = I2C_V3_SELECT | (u8) selector;
|
|
ret = i2c_smbus_write_byte(client, v3_prog);
|
|
if (ret)
|
|
return ret;
|
|
|
|
max1586->v3_curr_sel = selector;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int max1586_v6_get_voltage_sel(struct regulator_dev *rdev)
|
|
{
|
|
struct max1586_data *max1586 = rdev_get_drvdata(rdev);
|
|
|
|
return max1586->v6_curr_sel;
|
|
}
|
|
|
|
static int max1586_v6_set_voltage_sel(struct regulator_dev *rdev,
|
|
unsigned int selector)
|
|
{
|
|
struct max1586_data *max1586 = rdev_get_drvdata(rdev);
|
|
struct i2c_client *client = max1586->client;
|
|
u8 v6_prog;
|
|
int ret;
|
|
|
|
dev_dbg(&client->dev, "changing voltage v6 to %dmv\n",
|
|
rdev->desc->volt_table[selector] / 1000);
|
|
|
|
v6_prog = I2C_V6_SELECT | (u8) selector;
|
|
ret = i2c_smbus_write_byte(client, v6_prog);
|
|
if (ret)
|
|
return ret;
|
|
|
|
max1586->v6_curr_sel = selector;
|
|
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* The Maxim 1586 controls V3 and V6 voltages, but offers no way of reading back
|
|
* the set up value.
|
|
*/
|
|
static struct regulator_ops max1586_v3_ops = {
|
|
.get_voltage_sel = max1586_v3_get_voltage_sel,
|
|
.set_voltage_sel = max1586_v3_set_voltage_sel,
|
|
.list_voltage = regulator_list_voltage_linear,
|
|
.map_voltage = regulator_map_voltage_linear,
|
|
};
|
|
|
|
static struct regulator_ops max1586_v6_ops = {
|
|
.get_voltage_sel = max1586_v6_get_voltage_sel,
|
|
.set_voltage_sel = max1586_v6_set_voltage_sel,
|
|
.list_voltage = regulator_list_voltage_table,
|
|
};
|
|
|
|
static struct regulator_desc max1586_reg[] = {
|
|
{
|
|
.name = "Output_V3",
|
|
.id = MAX1586_V3,
|
|
.ops = &max1586_v3_ops,
|
|
.type = REGULATOR_VOLTAGE,
|
|
.n_voltages = MAX1586_V3_MAX_VSEL + 1,
|
|
.owner = THIS_MODULE,
|
|
},
|
|
{
|
|
.name = "Output_V6",
|
|
.id = MAX1586_V6,
|
|
.ops = &max1586_v6_ops,
|
|
.type = REGULATOR_VOLTAGE,
|
|
.n_voltages = MAX1586_V6_MAX_VSEL + 1,
|
|
.volt_table = v6_voltages_uv,
|
|
.owner = THIS_MODULE,
|
|
},
|
|
};
|
|
|
|
static int of_get_max1586_platform_data(struct device *dev,
|
|
struct max1586_platform_data *pdata)
|
|
{
|
|
struct max1586_subdev_data *sub;
|
|
struct of_regulator_match rmatch[ARRAY_SIZE(max1586_reg)] = { };
|
|
struct device_node *np = dev->of_node;
|
|
int i, matched;
|
|
|
|
if (of_property_read_u32(np, "v3-gain",
|
|
&pdata->v3_gain) < 0) {
|
|
dev_err(dev, "%s has no 'v3-gain' property\n", np->full_name);
|
|
return -EINVAL;
|
|
}
|
|
|
|
np = of_get_child_by_name(np, "regulators");
|
|
if (!np) {
|
|
dev_err(dev, "missing 'regulators' subnode in DT\n");
|
|
return -EINVAL;
|
|
}
|
|
|
|
for (i = 0; i < ARRAY_SIZE(rmatch); i++)
|
|
rmatch[i].name = max1586_reg[i].name;
|
|
|
|
matched = of_regulator_match(dev, np, rmatch, ARRAY_SIZE(rmatch));
|
|
of_node_put(np);
|
|
/*
|
|
* If matched is 0, ie. neither Output_V3 nor Output_V6 have been found,
|
|
* return 0, which signals the normal situation where no subregulator is
|
|
* available. This is normal because the max1586 doesn't provide any
|
|
* readback support, so the subregulators can't report any status
|
|
* anyway. If matched < 0, return the error.
|
|
*/
|
|
if (matched <= 0)
|
|
return matched;
|
|
|
|
pdata->subdevs = devm_kzalloc(dev, sizeof(struct max1586_subdev_data) *
|
|
matched, GFP_KERNEL);
|
|
if (!pdata->subdevs)
|
|
return -ENOMEM;
|
|
|
|
pdata->num_subdevs = matched;
|
|
sub = pdata->subdevs;
|
|
|
|
for (i = 0; i < matched; i++) {
|
|
sub->id = i;
|
|
sub->name = rmatch[i].of_node->name;
|
|
sub->platform_data = rmatch[i].init_data;
|
|
sub++;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static const struct of_device_id max1586_of_match[] = {
|
|
{ .compatible = "maxim,max1586", },
|
|
{},
|
|
};
|
|
MODULE_DEVICE_TABLE(of, max1586_of_match);
|
|
|
|
static int max1586_pmic_probe(struct i2c_client *client,
|
|
const struct i2c_device_id *i2c_id)
|
|
{
|
|
struct max1586_platform_data *pdata, pdata_of;
|
|
struct regulator_config config = { };
|
|
struct max1586_data *max1586;
|
|
int i, id, ret;
|
|
const struct of_device_id *match;
|
|
|
|
pdata = dev_get_platdata(&client->dev);
|
|
if (client->dev.of_node && !pdata) {
|
|
match = of_match_device(of_match_ptr(max1586_of_match),
|
|
&client->dev);
|
|
if (!match) {
|
|
dev_err(&client->dev, "Error: No device match found\n");
|
|
return -ENODEV;
|
|
}
|
|
ret = of_get_max1586_platform_data(&client->dev, &pdata_of);
|
|
if (ret < 0)
|
|
return ret;
|
|
pdata = &pdata_of;
|
|
}
|
|
|
|
max1586 = devm_kzalloc(&client->dev, sizeof(struct max1586_data),
|
|
GFP_KERNEL);
|
|
if (!max1586)
|
|
return -ENOMEM;
|
|
|
|
max1586->client = client;
|
|
|
|
if (!pdata->v3_gain)
|
|
return -EINVAL;
|
|
|
|
max1586->min_uV = MAX1586_V3_MIN_UV / 1000 * pdata->v3_gain / 1000;
|
|
max1586->max_uV = MAX1586_V3_MAX_UV / 1000 * pdata->v3_gain / 1000;
|
|
|
|
/* Set curr_sel to default voltage on power-up */
|
|
max1586->v3_curr_sel = 24; /* 1.3V */
|
|
max1586->v6_curr_sel = 0;
|
|
|
|
for (i = 0; i < pdata->num_subdevs && i <= MAX1586_V6; i++) {
|
|
struct regulator_dev *rdev;
|
|
|
|
id = pdata->subdevs[i].id;
|
|
if (!pdata->subdevs[i].platform_data)
|
|
continue;
|
|
if (id < MAX1586_V3 || id > MAX1586_V6) {
|
|
dev_err(&client->dev, "invalid regulator id %d\n", id);
|
|
return -EINVAL;
|
|
}
|
|
|
|
if (id == MAX1586_V3) {
|
|
max1586_reg[id].min_uV = max1586->min_uV;
|
|
max1586_reg[id].uV_step =
|
|
(max1586->max_uV - max1586->min_uV) /
|
|
MAX1586_V3_MAX_VSEL;
|
|
}
|
|
|
|
config.dev = &client->dev;
|
|
config.init_data = pdata->subdevs[i].platform_data;
|
|
config.driver_data = max1586;
|
|
|
|
rdev = devm_regulator_register(&client->dev,
|
|
&max1586_reg[id], &config);
|
|
if (IS_ERR(rdev)) {
|
|
dev_err(&client->dev, "failed to register %s\n",
|
|
max1586_reg[id].name);
|
|
return PTR_ERR(rdev);
|
|
}
|
|
}
|
|
|
|
i2c_set_clientdata(client, max1586);
|
|
dev_info(&client->dev, "Maxim 1586 regulator driver loaded\n");
|
|
return 0;
|
|
}
|
|
|
|
static const struct i2c_device_id max1586_id[] = {
|
|
{ "max1586", 0 },
|
|
{ }
|
|
};
|
|
MODULE_DEVICE_TABLE(i2c, max1586_id);
|
|
|
|
static struct i2c_driver max1586_pmic_driver = {
|
|
.probe = max1586_pmic_probe,
|
|
.driver = {
|
|
.name = "max1586",
|
|
.of_match_table = of_match_ptr(max1586_of_match),
|
|
},
|
|
.id_table = max1586_id,
|
|
};
|
|
|
|
static int __init max1586_pmic_init(void)
|
|
{
|
|
return i2c_add_driver(&max1586_pmic_driver);
|
|
}
|
|
subsys_initcall(max1586_pmic_init);
|
|
|
|
static void __exit max1586_pmic_exit(void)
|
|
{
|
|
i2c_del_driver(&max1586_pmic_driver);
|
|
}
|
|
module_exit(max1586_pmic_exit);
|
|
|
|
/* Module information */
|
|
MODULE_DESCRIPTION("MAXIM 1586 voltage regulator driver");
|
|
MODULE_AUTHOR("Robert Jarzmik");
|
|
MODULE_LICENSE("GPL");
|