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/*
* 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 = {
.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
|