/*
* LP8755 High Performance Power Management Unit : System Interface Driver
* (based on rev. 0.26)
* Copyright 2012 Texas Instruments
*
* Author: Daniel(Geon Si) Jeong <daniel.jeong@ti.com>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*
*/
#include <linux/module.h>
#include <linux/slab.h>
#include <linux/i2c.h>
#include <linux/err.h>
#include <linux/irq.h>
#include <linux/interrupt.h>
#include <linux/gpio.h>
#include <linux/regmap.h>
#include <linux/uaccess.h>
#include <linux/regulator/driver.h>
#include <linux/regulator/machine.h>
#include <linux/platform_data/lp8755.h>
#define LP8755_REG_BUCK0 0x00
#define LP8755_REG_BUCK1 0x03
#define LP8755_REG_BUCK2 0x04
#define LP8755_REG_BUCK3 0x01
#define LP8755_REG_BUCK4 0x05
#define LP8755_REG_BUCK5 0x02
#define LP8755_REG_MAX 0xFF
#define LP8755_BUCK_EN_M BIT(7)
#define LP8755_BUCK_LINEAR_OUT_MAX 0x76
#define LP8755_BUCK_VOUT_M 0x7F
struct lp8755_mphase {
int nreg;
int buck_num[LP8755_BUCK_MAX];
};
struct lp8755_chip {
struct device *dev;
struct regmap *regmap;
struct lp8755_platform_data *pdata;
int irq;
unsigned int irqmask;
int mphase;
struct regulator_dev *rdev[LP8755_BUCK_MAX];
};
/**
*lp8755_read : read a single register value from lp8755.
*@pchip : device to read from
*@reg : register to read from
*@val : pointer to store read value
*/
static int lp8755_read(struct lp8755_chip *pchip, unsigned int reg,
unsigned int *val)
{
return regmap_read(pchip->regmap, reg, val);
}
/**
*lp8755_write : write a single register value to lp8755.
*@pchip : device to write to
*@reg : register to write to
*@val : value to be written
*/
static int lp8755_write(struct lp8755_chip *pchip, unsigned int reg,
unsigned int val)
{
return regmap_write(pchip->regmap, reg, val);
}
/**
*lp8755_update_bits : set the values of bit fields in lp8755 register.
*@pchip : device to read from
*@reg : register to update
*@mask : bitmask to be changed
*@val : value for bitmask
*/
static int lp8755_update_bits(struct lp8755_chip *pchip, unsigned int reg,
unsigned int mask, unsigned int val)
{
return regmap_update_bits(pchip->regmap, reg, mask, val);
}
static int lp8755_buck_enable_time(struct regulator_dev *rdev)
{
int ret;
unsigned int regval;
enum lp8755_bucks id = rdev_get_id(rdev);
struct lp8755_chip *pchip = rdev_get_drvdata(rdev);
ret = lp8755_read(pchip, 0x12 + id, ®val);
if (ret < 0) {
dev_err(pchip->dev, "i2c acceess error %s\n", __func__);
return ret;
}
return (regval & 0xff) * 100;
}
static int lp8755_buck_set_mode(struct regulator_dev *rdev, unsigned int mode)
{
int ret;
unsigned int regbval = 0x0;
enum lp8755_bucks id = rdev_get_id(rdev);
struct lp8755_chip *pchip = rdev_get_drvdata(rdev);
switch (mode) {
case REGULATOR_MODE_FAST:
/* forced pwm mode */
regbval = (0x01 << id);
break;
case REGULATOR_MODE_NORMAL:
/* enable automatic pwm/pfm mode */
ret = lp8755_update_bits(pchip, 0x08 + id, 0x20, 0x00);
if (ret < 0)
goto err_i2c;
break;
case REGULATOR_MODE_IDLE:
/* enable automatic pwm/pfm/lppfm mode */
ret = lp8755_update_bits(pchip, 0x08 + id, 0x20, 0x20);
if (ret < 0)
goto err_i2c;
ret = lp8755_update_bits(pchip, 0x10, 0x01, 0x01);
if (ret < 0)
goto err_i2c;
break;
default:
dev_err(pchip->dev, "Not supported buck mode %s\n", __func__);
/* forced pwm mode */
regbval = (0x01 << id);
}
ret = lp8755_update_bits(pchip, 0x06, 0x01 << id, regbval);
if (ret < 0)
goto err_i2c;
return ret;
err_i2c:
dev_err(pchip->dev, "i2c acceess error %s\n", __func__);
return ret;
}
static unsigned int lp8755_buck_get_mode(struct regulator_dev *rdev)
{
int ret;
unsigned int regval;
enum lp8755_bucks id = rdev_get_id(rdev);
struct lp8755_chip *pchip = rdev_get_drvdata(rdev);
ret = lp8755_read(pchip, 0x06, ®val);
if (ret < 0)
goto err_i2c;
/* mode fast means forced pwm mode */
if (regval & (0x01 << id))
return REGULATOR_MODE_FAST;
ret = lp8755_read(pchip, 0x08 + id, ®val);
if (ret < 0)
goto err_i2c;
/* mode idle means automatic pwm/pfm/lppfm mode */
if (regval & 0x20)
return REGULATOR_MODE_IDLE;
/* mode normal means automatic pwm/pfm mode */
return REGULATOR_MODE_NORMAL;
err_i2c:
dev_err(pchip->dev, "i2c acceess error %s\n", __func__);
return 0;
}
static int lp8755_buck_set_ramp(struct regulator_dev *rdev, int ramp)
{
int ret;
unsigned int regval = 0x00;
enum lp8755_bucks id = rdev_get_id(rdev);
struct lp8755_chip *pchip = rdev_get_drvdata(rdev);
/* uV/us */
switch (ramp) {
case 0 ... 230:
regval = 0x07;
break;
case 231 ... 470:
regval = 0x06;
break;
case 471 ... 940:
regval = 0x05;
break;
case 941 ... 1900:
regval = 0x04;
break;
case 1901 ... 3800:
regval = 0x03;
break;
case 3801 ... 7500:
regval = 0x02;
break;
case 7501 ... 15000:
regval = 0x01;
break;
case 15001 ... 30000:
regval = 0x00;
break;
default:
dev_err(pchip->dev,
"Not supported ramp value %d %s\n", ramp, __func__);
return -EINVAL;
}
ret = lp8755_update_bits(pchip, 0x07 + id, 0x07, regval);
if (ret < 0)
goto err_i2c;
return ret;
err_i2c:
dev_err(pchip->dev, "i2c acceess error %s\n", __func__);
return ret;
}
static struct regulator_ops lp8755_buck_ops = {
.map_voltage = regulator_map_voltage_linear,
.list_voltage = regulator_list_voltage_linear,
.set_voltage_sel = regulator_set_voltage_sel_regmap,
.get_voltage_sel = regulator_get_voltage_sel_regmap,
.enable = regulator_enable_regmap,
.disable = regulator_disable_regmap,
.is_enabled = regulator_is_enabled_regmap,
.enable_time = lp8755_buck_enable_time,
.set_mode = lp8755_buck_set_mode,
.get_mode = lp8755_buck_get_mode,
.set_ramp_delay = lp8755_buck_set_ramp,
};
#define lp8755_rail(_id) "lp8755_buck"#_id
#define lp8755_buck_init(_id)\
{\
.constraints = {\
.name = lp8755_rail(_id),\
.valid_ops_mask = REGULATOR_CHANGE_VOLTAGE,\
.min_uV = 500000,\
.max_uV = 1675000,\
},\
}
static struct regulator_init_data lp8755_reg_default[LP8755_BUCK_MAX] = {
[LP8755_BUCK0] = lp8755_buck_init(0),
[LP8755_BUCK1] = lp8755_buck_init(1),
[LP8755_BUCK2] = lp8755_buck_init(2),
[LP8755_BUCK3] = lp8755_buck_init(3),
[LP8755_BUCK4] = lp8755_buck_init(4),
[LP8755_BUCK5] = lp8755_buck_init(5),
};
static const struct lp8755_mphase mphase_buck[MPHASE_CONF_MAX] = {
{ 3, { LP8755_BUCK0, LP8755_BUCK3, LP8755_BUCK5 } },
{ 6, { LP8755_BUCK0, LP8755_BUCK1, LP8755_BUCK2, LP8755_BUCK3,
LP8755_BUCK4, LP8755_BUCK5 } },
{ 5, { LP8755_BUCK0, LP8755_BUCK2, LP8755_BUCK3, LP8755_BUCK4,
LP8755_BUCK5} },
{ 4, { LP8755_BUCK0, LP8755_BUCK3, LP8755_BUCK4, LP8755_BUCK5} },
{ 3, { LP8755_BUCK0, LP8755_BUCK4, LP8755_BUCK5} },
{ 2, { LP8755_BUCK0, LP8755_BUCK5} },
{ 1, { LP8755_BUCK0} },
{ 2, { LP8755_BUCK0, LP8755_BUCK3} },
{ 4, { LP8755_BUCK0, LP8755_BUCK2, LP8755_BUCK3, LP8755_BUCK5} },
};
static int lp8755_init_data(struct lp8755_chip *pchip)
{
unsigned int regval;
int ret, icnt, buck_num;
struct lp8755_platform_data *pdata = pchip->pdata;
/* read back muti-phase configuration */
ret = lp8755_read(pchip, 0x3D, ®val);
if (ret < 0)
goto out_i2c_error;
pchip->mphase = regval & 0x0F;
/* set default data based on multi-phase config */
for (icnt = 0; icnt < mphase_buck[pchip->mphase].nreg; icnt++) {
buck_num = mphase_buck[pchip->mphase].buck_num[icnt];
pdata->buck_data[buck_num] = &lp8755_reg_default[buck_num];
}
return ret;
out_i2c_error:
dev_err(pchip->dev, "i2c acceess error %s\n", __func__);
return ret;
}
#define lp8755_buck_desc(_id)\
{\
.name = lp8755_rail(_id),\
.id = LP8755_BUCK##_id,\
.ops = &lp8755_buck_ops,\
.n_voltages = LP8755_BUCK_LINEAR_OUT_MAX+1,\
.uV_step = 10000,\
.min_uV = 500000,\
.type = REGULATOR_VOLTAGE,\
.owner = THIS_MODULE,\
.enable_reg = LP8755_REG_BUCK##_id,\
.enable_mask = LP8755_BUCK_EN_M,\
.vsel_reg = LP8755_REG_BUCK##_id,\
.vsel_mask = LP8755_BUCK_VOUT_M,\
}
static struct regulator_desc lp8755_regulators[] = {
lp8755_buck_desc(0),
lp8755_buck_desc(1),
lp8755_buck_desc(2),
lp8755_buck_desc(3),
lp8755_buck_desc(4),
lp8755_buck_desc(5),
};
static int lp8755_regulator_init(struct lp8755_chip *pchip)
{
int ret, icnt, buck_num;
struct lp8755_platform_data *pdata = pchip->pdata;
struct regulator_config rconfig = { };
rconfig.regmap = pchip->regmap;
rconfig.dev = pchip->dev;
rconfig.driver_data = pchip;
for (icnt = 0; icnt < mphase_buck[pchip->mphase].nreg; icnt++) {
buck_num = mphase_buck[pchip->mphase].buck_num[icnt];
rconfig.init_data = pdata->buck_data[buck_num];
rconfig.of_node = pchip->dev->of_node;
pchip->rdev[buck_num] =
regulator_register(&lp8755_regulators[buck_num], &rconfig);
if (IS_ERR(pchip->rdev[buck_num])) {
ret = PTR_ERR(pchip->rdev[buck_num]);
pchip->rdev[buck_num] = NULL;
dev_err(pchip->dev, "regulator init failed: buck %d\n",
buck_num);
goto err_buck;
}
}
return 0;
err_buck:
for (icnt = 0; icnt < LP8755_BUCK_MAX; icnt++)
regulator_unregister(pchip->rdev[icnt]);
return ret;
}
static irqreturn_t lp8755_irq_handler(int irq, void *data)
{
int ret, icnt;
unsigned int flag0, flag1;
struct lp8755_chip *pchip = data;
/* read flag0 register */
ret = lp8755_read(pchip, 0x0D, &flag0);
if (ret < 0)
goto err_i2c;
/* clear flag register to pull up int. pin */
ret = lp8755_write(pchip, 0x0D, 0x00);
if (ret < 0)
goto err_i2c;
/* sent power fault detection event to specific regulator */
for (icnt = 0; icnt < LP8755_BUCK_MAX; icnt++)
if ((flag0 & (0x4 << icnt))
&& (pchip->irqmask & (0x04 << icnt))
&& (pchip->rdev[icnt] != NULL))
regulator_notifier_call_chain(pchip->rdev[icnt],
LP8755_EVENT_PWR_FAULT,
NULL);
/* read flag1 register */
ret = lp8755_read(pchip, 0x0E, &flag1);
if (ret < 0)
goto err_i2c;
/* clear flag register to pull up int. pin */
ret = lp8755_write(pchip, 0x0E, 0x00);
if (ret < 0)
goto err_i2c;
/* send OCP event to all regualtor devices */
if ((flag1 & 0x01) && (pchip->irqmask & 0x01))
for (icnt = 0; icnt < LP8755_BUCK_MAX; icnt++)
if (pchip->rdev[icnt] != NULL)
regulator_notifier_call_chain(pchip->rdev[icnt],
LP8755_EVENT_OCP,
NULL);
/* send OVP event to all regualtor devices */
if ((flag1 & 0x02) && (pchip->irqmask & 0x02))
for (icnt = 0; icnt < LP8755_BUCK_MAX; icnt++)
if (pchip->rdev[icnt] != NULL)
regulator_notifier_call_chain(pchip->rdev[icnt],
LP8755_EVENT_OVP,
NULL);
return IRQ_HANDLED;
err_i2c:
dev_err(pchip->dev, "i2c acceess error %s\n", __func__);
return IRQ_NONE;
}
static int lp8755_int_config(struct lp8755_chip *pchip)
{
int ret;
unsigned int regval;
if (pchip->irq == 0) {
dev_warn(pchip->dev, "not use interrupt : %s\n", __func__);
return 0;
}
ret = lp8755_read(pchip, 0x0F, ®val);
if (ret < 0)
goto err_i2c;
pchip->irqmask = regval;
ret = request_threaded_irq(pchip->irq, NULL, lp8755_irq_handler,
IRQF_TRIGGER_FALLING | IRQF_ONESHOT,
"lp8755-irq", pchip);
if (ret)
return ret;
return ret;
err_i2c:
dev_err(pchip->dev, "i2c acceess error %s\n", __func__);
return ret;
}
static const struct regmap_config lp8755_regmap = {
.reg_bits = 8,
.val_bits = 8,
.max_register = LP8755_REG_MAX,
};
static int lp8755_probe(struct i2c_client *client,
const struct i2c_device_id *id)
{
int ret, icnt;
struct lp8755_chip *pchip;
struct lp8755_platform_data *pdata = dev_get_platdata(&client->dev);
if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C)) {
dev_err(&client->dev, "i2c functionality check fail.\n");
return -EOPNOTSUPP;
}
pchip = devm_kzalloc(&client->dev,
sizeof(struct lp8755_chip), GFP_KERNEL);
if (!pchip)
return -ENOMEM;
pchip->dev = &client->dev;
pchip->regmap = devm_regmap_init_i2c(client, &lp8755_regmap);
if (IS_ERR(pchip->regmap)) {
ret = PTR_ERR(pchip->regmap);
dev_err(&client->dev, "fail to allocate regmap %d\n", ret);
return ret;
}
i2c_set_clientdata(client, pchip);
if (pdata != NULL) {
pchip->pdata = pdata;
pchip->mphase = pdata->mphase;
} else {
pchip->pdata = devm_kzalloc(pchip->dev,
sizeof(struct lp8755_platform_data),
GFP_KERNEL);
if (!pchip->pdata)
return -ENOMEM;
ret = lp8755_init_data(pchip);
if (ret < 0) {
dev_err(&client->dev, "fail to initialize chip\n");
return ret;
}
}
ret = lp8755_regulator_init(pchip);
if (ret < 0) {
dev_err(&client->dev, "fail to initialize regulators\n");
goto err_regulator;
}
pchip->irq = client->irq;
ret = lp8755_int_config(pchip);
if (ret < 0) {
dev_err(&client->dev, "fail to irq config\n");
goto err_irq;
}
return ret;
err_irq:
for (icnt = 0; icnt < mphase_buck[pchip->mphase].nreg; icnt++)
regulator_unregister(pchip->rdev[icnt]);
err_regulator:
/* output disable */
for (icnt = 0; icnt < LP8755_BUCK_MAX; icnt++)
lp8755_write(pchip, icnt, 0x00);
return ret;
}
static int lp8755_remove(struct i2c_client *client)
{
int icnt;
struct lp8755_chip *pchip = i2c_get_clientdata(client);
for (icnt = 0; icnt < mphase_buck[pchip->mphase].nreg; icnt++)
regulator_unregister(pchip->rdev[icnt]);
for (icnt = 0; icnt < LP8755_BUCK_MAX; icnt++)
lp8755_write(pchip, icnt, 0x00);
if (pchip->irq != 0)
free_irq(pchip->irq, pchip);
return 0;
}
static const struct i2c_device_id lp8755_id[] = {
{LP8755_NAME, 0},
{}
};
MODULE_DEVICE_TABLE(i2c, lp8755_id);
static struct i2c_driver lp8755_i2c_driver = {
.driver = {
.name = LP8755_NAME,
},
.probe = lp8755_probe,
.remove = lp8755_remove,
.id_table = lp8755_id,
};
static int __init lp8755_init(void)
{
return i2c_add_driver(&lp8755_i2c_driver);
}
subsys_initcall(lp8755_init);
static void __exit lp8755_exit(void)
{
i2c_del_driver(&lp8755_i2c_driver);
}
module_exit(lp8755_exit);
MODULE_DESCRIPTION("Texas Instruments lp8755 driver");
MODULE_AUTHOR("Daniel Jeong <daniel.jeong@ti.com>");
MODULE_LICENSE("GPL v2");