508 lines
13 KiB
C
508 lines
13 KiB
C
/*
|
|
* max8660.c -- Voltage regulation for the Maxim 8660/8661
|
|
*
|
|
* based on max1586.c and wm8400-regulator.c
|
|
*
|
|
* Copyright (C) 2009 Wolfram Sang, Pengutronix e.K.
|
|
*
|
|
* 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 of the License.
|
|
*
|
|
* 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
|
|
*
|
|
* Some info:
|
|
*
|
|
* Datasheet: http://datasheets.maxim-ic.com/en/ds/MAX8660-MAX8661.pdf
|
|
*
|
|
* This chip is a bit nasty because it is a write-only device. Thus, the driver
|
|
* uses shadow registers to keep track of its values. The main problem appears
|
|
* to be the initialization: When Linux boots up, we cannot know if the chip is
|
|
* in the default state or not, so we would have to pass such information in
|
|
* platform_data. As this adds a bit of complexity to the driver, this is left
|
|
* out for now until it is really needed.
|
|
*
|
|
* [A|S|M]DTV1 registers are currently not used, but [A|S|M]DTV2.
|
|
*
|
|
* If the driver is feature complete, it might be worth to check if one set of
|
|
* functions for V3-V7 is sufficient. For maximum flexibility during
|
|
* development, they are separated for now.
|
|
*
|
|
*/
|
|
|
|
#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/max8660.h>
|
|
|
|
#define MAX8660_DCDC_MIN_UV 725000
|
|
#define MAX8660_DCDC_MAX_UV 1800000
|
|
#define MAX8660_DCDC_STEP 25000
|
|
#define MAX8660_DCDC_MAX_SEL 0x2b
|
|
|
|
#define MAX8660_LDO5_MIN_UV 1700000
|
|
#define MAX8660_LDO5_MAX_UV 2000000
|
|
#define MAX8660_LDO5_STEP 25000
|
|
#define MAX8660_LDO5_MAX_SEL 0x0c
|
|
|
|
#define MAX8660_LDO67_MIN_UV 1800000
|
|
#define MAX8660_LDO67_MAX_UV 3300000
|
|
#define MAX8660_LDO67_STEP 100000
|
|
#define MAX8660_LDO67_MAX_SEL 0x0f
|
|
|
|
enum {
|
|
MAX8660_OVER1,
|
|
MAX8660_OVER2,
|
|
MAX8660_VCC1,
|
|
MAX8660_ADTV1,
|
|
MAX8660_ADTV2,
|
|
MAX8660_SDTV1,
|
|
MAX8660_SDTV2,
|
|
MAX8660_MDTV1,
|
|
MAX8660_MDTV2,
|
|
MAX8660_L12VCR,
|
|
MAX8660_FPWM,
|
|
MAX8660_N_REGS, /* not a real register */
|
|
};
|
|
|
|
struct max8660 {
|
|
struct i2c_client *client;
|
|
u8 shadow_regs[MAX8660_N_REGS]; /* as chip is write only */
|
|
struct regulator_dev *rdev[];
|
|
};
|
|
|
|
static int max8660_write(struct max8660 *max8660, u8 reg, u8 mask, u8 val)
|
|
{
|
|
static const u8 max8660_addresses[MAX8660_N_REGS] =
|
|
{ 0x10, 0x12, 0x20, 0x23, 0x24, 0x29, 0x2a, 0x32, 0x33, 0x39, 0x80 };
|
|
|
|
int ret;
|
|
u8 reg_val = (max8660->shadow_regs[reg] & mask) | val;
|
|
dev_vdbg(&max8660->client->dev, "Writing reg %02x with %02x\n",
|
|
max8660_addresses[reg], reg_val);
|
|
|
|
ret = i2c_smbus_write_byte_data(max8660->client,
|
|
max8660_addresses[reg], reg_val);
|
|
if (ret == 0)
|
|
max8660->shadow_regs[reg] = reg_val;
|
|
|
|
return ret;
|
|
}
|
|
|
|
|
|
/*
|
|
* DCDC functions
|
|
*/
|
|
|
|
static int max8660_dcdc_is_enabled(struct regulator_dev *rdev)
|
|
{
|
|
struct max8660 *max8660 = rdev_get_drvdata(rdev);
|
|
u8 val = max8660->shadow_regs[MAX8660_OVER1];
|
|
u8 mask = (rdev_get_id(rdev) == MAX8660_V3) ? 1 : 4;
|
|
return !!(val & mask);
|
|
}
|
|
|
|
static int max8660_dcdc_enable(struct regulator_dev *rdev)
|
|
{
|
|
struct max8660 *max8660 = rdev_get_drvdata(rdev);
|
|
u8 bit = (rdev_get_id(rdev) == MAX8660_V3) ? 1 : 4;
|
|
return max8660_write(max8660, MAX8660_OVER1, 0xff, bit);
|
|
}
|
|
|
|
static int max8660_dcdc_disable(struct regulator_dev *rdev)
|
|
{
|
|
struct max8660 *max8660 = rdev_get_drvdata(rdev);
|
|
u8 mask = (rdev_get_id(rdev) == MAX8660_V3) ? ~1 : ~4;
|
|
return max8660_write(max8660, MAX8660_OVER1, mask, 0);
|
|
}
|
|
|
|
static int max8660_dcdc_get_voltage_sel(struct regulator_dev *rdev)
|
|
{
|
|
struct max8660 *max8660 = rdev_get_drvdata(rdev);
|
|
|
|
u8 reg = (rdev_get_id(rdev) == MAX8660_V3) ? MAX8660_ADTV2 : MAX8660_SDTV2;
|
|
u8 selector = max8660->shadow_regs[reg];
|
|
return selector;
|
|
}
|
|
|
|
static int max8660_dcdc_set(struct regulator_dev *rdev, int min_uV, int max_uV,
|
|
unsigned int *s)
|
|
{
|
|
struct max8660 *max8660 = rdev_get_drvdata(rdev);
|
|
u8 reg, selector, bits;
|
|
int ret;
|
|
|
|
if (min_uV < MAX8660_DCDC_MIN_UV || min_uV > MAX8660_DCDC_MAX_UV)
|
|
return -EINVAL;
|
|
if (max_uV < MAX8660_DCDC_MIN_UV || max_uV > MAX8660_DCDC_MAX_UV)
|
|
return -EINVAL;
|
|
|
|
selector = DIV_ROUND_UP(min_uV - MAX8660_DCDC_MIN_UV,
|
|
MAX8660_DCDC_STEP);
|
|
|
|
ret = regulator_list_voltage_linear(rdev, selector);
|
|
if (ret < 0 || ret > max_uV)
|
|
return -EINVAL;
|
|
|
|
*s = selector;
|
|
|
|
reg = (rdev_get_id(rdev) == MAX8660_V3) ? MAX8660_ADTV2 : MAX8660_SDTV2;
|
|
ret = max8660_write(max8660, reg, 0, selector);
|
|
if (ret)
|
|
return ret;
|
|
|
|
/* Select target voltage register and activate regulation */
|
|
bits = (rdev_get_id(rdev) == MAX8660_V3) ? 0x03 : 0x30;
|
|
return max8660_write(max8660, MAX8660_VCC1, 0xff, bits);
|
|
}
|
|
|
|
static struct regulator_ops max8660_dcdc_ops = {
|
|
.is_enabled = max8660_dcdc_is_enabled,
|
|
.list_voltage = regulator_list_voltage_linear,
|
|
.set_voltage = max8660_dcdc_set,
|
|
.get_voltage_sel = max8660_dcdc_get_voltage_sel,
|
|
};
|
|
|
|
|
|
/*
|
|
* LDO5 functions
|
|
*/
|
|
|
|
static int max8660_ldo5_get_voltage_sel(struct regulator_dev *rdev)
|
|
{
|
|
struct max8660 *max8660 = rdev_get_drvdata(rdev);
|
|
|
|
u8 selector = max8660->shadow_regs[MAX8660_MDTV2];
|
|
return selector;
|
|
}
|
|
|
|
static int max8660_ldo5_set(struct regulator_dev *rdev, int min_uV, int max_uV,
|
|
unsigned int *s)
|
|
{
|
|
struct max8660 *max8660 = rdev_get_drvdata(rdev);
|
|
u8 selector;
|
|
int ret;
|
|
|
|
if (min_uV < MAX8660_LDO5_MIN_UV || min_uV > MAX8660_LDO5_MAX_UV)
|
|
return -EINVAL;
|
|
if (max_uV < MAX8660_LDO5_MIN_UV || max_uV > MAX8660_LDO5_MAX_UV)
|
|
return -EINVAL;
|
|
|
|
selector = DIV_ROUND_UP(min_uV - MAX8660_LDO5_MIN_UV,
|
|
MAX8660_LDO5_STEP);
|
|
|
|
ret = regulator_list_voltage_linear(rdev, selector);
|
|
if (ret < 0 || ret > max_uV)
|
|
return -EINVAL;
|
|
|
|
*s = selector;
|
|
|
|
ret = max8660_write(max8660, MAX8660_MDTV2, 0, selector);
|
|
if (ret)
|
|
return ret;
|
|
|
|
/* Select target voltage register and activate regulation */
|
|
return max8660_write(max8660, MAX8660_VCC1, 0xff, 0xc0);
|
|
}
|
|
|
|
static struct regulator_ops max8660_ldo5_ops = {
|
|
.list_voltage = regulator_list_voltage_linear,
|
|
.set_voltage = max8660_ldo5_set,
|
|
.get_voltage_sel = max8660_ldo5_get_voltage_sel,
|
|
};
|
|
|
|
|
|
/*
|
|
* LDO67 functions
|
|
*/
|
|
|
|
static int max8660_ldo67_is_enabled(struct regulator_dev *rdev)
|
|
{
|
|
struct max8660 *max8660 = rdev_get_drvdata(rdev);
|
|
u8 val = max8660->shadow_regs[MAX8660_OVER2];
|
|
u8 mask = (rdev_get_id(rdev) == MAX8660_V6) ? 2 : 4;
|
|
return !!(val & mask);
|
|
}
|
|
|
|
static int max8660_ldo67_enable(struct regulator_dev *rdev)
|
|
{
|
|
struct max8660 *max8660 = rdev_get_drvdata(rdev);
|
|
u8 bit = (rdev_get_id(rdev) == MAX8660_V6) ? 2 : 4;
|
|
return max8660_write(max8660, MAX8660_OVER2, 0xff, bit);
|
|
}
|
|
|
|
static int max8660_ldo67_disable(struct regulator_dev *rdev)
|
|
{
|
|
struct max8660 *max8660 = rdev_get_drvdata(rdev);
|
|
u8 mask = (rdev_get_id(rdev) == MAX8660_V6) ? ~2 : ~4;
|
|
return max8660_write(max8660, MAX8660_OVER2, mask, 0);
|
|
}
|
|
|
|
static int max8660_ldo67_get_voltage_sel(struct regulator_dev *rdev)
|
|
{
|
|
struct max8660 *max8660 = rdev_get_drvdata(rdev);
|
|
|
|
u8 shift = (rdev_get_id(rdev) == MAX8660_V6) ? 0 : 4;
|
|
u8 selector = (max8660->shadow_regs[MAX8660_L12VCR] >> shift) & 0xf;
|
|
return selector;
|
|
}
|
|
|
|
static int max8660_ldo67_set(struct regulator_dev *rdev, int min_uV,
|
|
int max_uV, unsigned int *s)
|
|
{
|
|
struct max8660 *max8660 = rdev_get_drvdata(rdev);
|
|
u8 selector;
|
|
int ret;
|
|
|
|
if (min_uV < MAX8660_LDO67_MIN_UV || min_uV > MAX8660_LDO67_MAX_UV)
|
|
return -EINVAL;
|
|
if (max_uV < MAX8660_LDO67_MIN_UV || max_uV > MAX8660_LDO67_MAX_UV)
|
|
return -EINVAL;
|
|
|
|
selector = DIV_ROUND_UP(min_uV - MAX8660_LDO67_MIN_UV,
|
|
MAX8660_LDO67_STEP);
|
|
|
|
ret = regulator_list_voltage_linear(rdev, selector);
|
|
if (ret < 0 || ret > max_uV)
|
|
return -EINVAL;
|
|
|
|
*s = selector;
|
|
|
|
if (rdev_get_id(rdev) == MAX8660_V6)
|
|
return max8660_write(max8660, MAX8660_L12VCR, 0xf0, selector);
|
|
else
|
|
return max8660_write(max8660, MAX8660_L12VCR, 0x0f, selector << 4);
|
|
}
|
|
|
|
static struct regulator_ops max8660_ldo67_ops = {
|
|
.is_enabled = max8660_ldo67_is_enabled,
|
|
.enable = max8660_ldo67_enable,
|
|
.disable = max8660_ldo67_disable,
|
|
.list_voltage = regulator_list_voltage_linear,
|
|
.get_voltage_sel = max8660_ldo67_get_voltage_sel,
|
|
.set_voltage = max8660_ldo67_set,
|
|
};
|
|
|
|
static const struct regulator_desc max8660_reg[] = {
|
|
{
|
|
.name = "V3(DCDC)",
|
|
.id = MAX8660_V3,
|
|
.ops = &max8660_dcdc_ops,
|
|
.type = REGULATOR_VOLTAGE,
|
|
.n_voltages = MAX8660_DCDC_MAX_SEL + 1,
|
|
.owner = THIS_MODULE,
|
|
.min_uV = MAX8660_DCDC_MIN_UV,
|
|
.uV_step = MAX8660_DCDC_STEP,
|
|
},
|
|
{
|
|
.name = "V4(DCDC)",
|
|
.id = MAX8660_V4,
|
|
.ops = &max8660_dcdc_ops,
|
|
.type = REGULATOR_VOLTAGE,
|
|
.n_voltages = MAX8660_DCDC_MAX_SEL + 1,
|
|
.owner = THIS_MODULE,
|
|
.min_uV = MAX8660_DCDC_MIN_UV,
|
|
.uV_step = MAX8660_DCDC_STEP,
|
|
},
|
|
{
|
|
.name = "V5(LDO)",
|
|
.id = MAX8660_V5,
|
|
.ops = &max8660_ldo5_ops,
|
|
.type = REGULATOR_VOLTAGE,
|
|
.n_voltages = MAX8660_LDO5_MAX_SEL + 1,
|
|
.owner = THIS_MODULE,
|
|
.min_uV = MAX8660_LDO5_MIN_UV,
|
|
.uV_step = MAX8660_LDO5_STEP,
|
|
},
|
|
{
|
|
.name = "V6(LDO)",
|
|
.id = MAX8660_V6,
|
|
.ops = &max8660_ldo67_ops,
|
|
.type = REGULATOR_VOLTAGE,
|
|
.n_voltages = MAX8660_LDO67_MAX_SEL + 1,
|
|
.owner = THIS_MODULE,
|
|
.min_uV = MAX8660_LDO67_MIN_UV,
|
|
.uV_step = MAX8660_LDO67_STEP,
|
|
},
|
|
{
|
|
.name = "V7(LDO)",
|
|
.id = MAX8660_V7,
|
|
.ops = &max8660_ldo67_ops,
|
|
.type = REGULATOR_VOLTAGE,
|
|
.n_voltages = MAX8660_LDO67_MAX_SEL + 1,
|
|
.owner = THIS_MODULE,
|
|
.min_uV = MAX8660_LDO67_MIN_UV,
|
|
.uV_step = MAX8660_LDO67_STEP,
|
|
},
|
|
};
|
|
|
|
static int __devinit max8660_probe(struct i2c_client *client,
|
|
const struct i2c_device_id *i2c_id)
|
|
{
|
|
struct regulator_dev **rdev;
|
|
struct max8660_platform_data *pdata = client->dev.platform_data;
|
|
struct regulator_config config = { };
|
|
struct max8660 *max8660;
|
|
int boot_on, i, id, ret = -EINVAL;
|
|
|
|
if (pdata->num_subdevs > MAX8660_V_END) {
|
|
dev_err(&client->dev, "Too many regulators found!\n");
|
|
return -EINVAL;
|
|
}
|
|
|
|
max8660 = devm_kzalloc(&client->dev, sizeof(struct max8660) +
|
|
sizeof(struct regulator_dev *) * MAX8660_V_END,
|
|
GFP_KERNEL);
|
|
if (!max8660)
|
|
return -ENOMEM;
|
|
|
|
max8660->client = client;
|
|
rdev = max8660->rdev;
|
|
|
|
if (pdata->en34_is_high) {
|
|
/* Simulate always on */
|
|
max8660->shadow_regs[MAX8660_OVER1] = 5;
|
|
} else {
|
|
/* Otherwise devices can be toggled via software */
|
|
max8660_dcdc_ops.enable = max8660_dcdc_enable;
|
|
max8660_dcdc_ops.disable = max8660_dcdc_disable;
|
|
}
|
|
|
|
/*
|
|
* First, set up shadow registers to prevent glitches. As some
|
|
* registers are shared between regulators, everything must be properly
|
|
* set up for all regulators in advance.
|
|
*/
|
|
max8660->shadow_regs[MAX8660_ADTV1] =
|
|
max8660->shadow_regs[MAX8660_ADTV2] =
|
|
max8660->shadow_regs[MAX8660_SDTV1] =
|
|
max8660->shadow_regs[MAX8660_SDTV2] = 0x1b;
|
|
max8660->shadow_regs[MAX8660_MDTV1] =
|
|
max8660->shadow_regs[MAX8660_MDTV2] = 0x04;
|
|
|
|
for (i = 0; i < pdata->num_subdevs; i++) {
|
|
|
|
if (!pdata->subdevs[i].platform_data)
|
|
goto err_out;
|
|
|
|
boot_on = pdata->subdevs[i].platform_data->constraints.boot_on;
|
|
|
|
switch (pdata->subdevs[i].id) {
|
|
case MAX8660_V3:
|
|
if (boot_on)
|
|
max8660->shadow_regs[MAX8660_OVER1] |= 1;
|
|
break;
|
|
|
|
case MAX8660_V4:
|
|
if (boot_on)
|
|
max8660->shadow_regs[MAX8660_OVER1] |= 4;
|
|
break;
|
|
|
|
case MAX8660_V5:
|
|
break;
|
|
|
|
case MAX8660_V6:
|
|
if (boot_on)
|
|
max8660->shadow_regs[MAX8660_OVER2] |= 2;
|
|
break;
|
|
|
|
case MAX8660_V7:
|
|
if (!strcmp(i2c_id->name, "max8661")) {
|
|
dev_err(&client->dev, "Regulator not on this chip!\n");
|
|
goto err_out;
|
|
}
|
|
|
|
if (boot_on)
|
|
max8660->shadow_regs[MAX8660_OVER2] |= 4;
|
|
break;
|
|
|
|
default:
|
|
dev_err(&client->dev, "invalid regulator %s\n",
|
|
pdata->subdevs[i].name);
|
|
goto err_out;
|
|
}
|
|
}
|
|
|
|
/* Finally register devices */
|
|
for (i = 0; i < pdata->num_subdevs; i++) {
|
|
|
|
id = pdata->subdevs[i].id;
|
|
|
|
config.dev = &client->dev;
|
|
config.init_data = pdata->subdevs[i].platform_data;
|
|
config.driver_data = max8660;
|
|
|
|
rdev[i] = regulator_register(&max8660_reg[id], &config);
|
|
if (IS_ERR(rdev[i])) {
|
|
ret = PTR_ERR(rdev[i]);
|
|
dev_err(&client->dev, "failed to register %s\n",
|
|
max8660_reg[id].name);
|
|
goto err_unregister;
|
|
}
|
|
}
|
|
|
|
i2c_set_clientdata(client, max8660);
|
|
return 0;
|
|
|
|
err_unregister:
|
|
while (--i >= 0)
|
|
regulator_unregister(rdev[i]);
|
|
err_out:
|
|
return ret;
|
|
}
|
|
|
|
static int __devexit max8660_remove(struct i2c_client *client)
|
|
{
|
|
struct max8660 *max8660 = i2c_get_clientdata(client);
|
|
int i;
|
|
|
|
for (i = 0; i < MAX8660_V_END; i++)
|
|
if (max8660->rdev[i])
|
|
regulator_unregister(max8660->rdev[i]);
|
|
return 0;
|
|
}
|
|
|
|
static const struct i2c_device_id max8660_id[] = {
|
|
{ "max8660", 0 },
|
|
{ "max8661", 0 },
|
|
{ }
|
|
};
|
|
MODULE_DEVICE_TABLE(i2c, max8660_id);
|
|
|
|
static struct i2c_driver max8660_driver = {
|
|
.probe = max8660_probe,
|
|
.remove = __devexit_p(max8660_remove),
|
|
.driver = {
|
|
.name = "max8660",
|
|
.owner = THIS_MODULE,
|
|
},
|
|
.id_table = max8660_id,
|
|
};
|
|
|
|
static int __init max8660_init(void)
|
|
{
|
|
return i2c_add_driver(&max8660_driver);
|
|
}
|
|
subsys_initcall(max8660_init);
|
|
|
|
static void __exit max8660_exit(void)
|
|
{
|
|
i2c_del_driver(&max8660_driver);
|
|
}
|
|
module_exit(max8660_exit);
|
|
|
|
/* Module information */
|
|
MODULE_DESCRIPTION("MAXIM 8660/8661 voltage regulator driver");
|
|
MODULE_AUTHOR("Wolfram Sang");
|
|
MODULE_LICENSE("GPL v2");
|