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/*
* tps80031-regulator.c -- TI TPS80031 regulator driver.
*
* Regulator driver for TI TPS80031/TPS80032 Fully Integrated Power
* Management with Power Path and Battery Charger.
*
* Copyright (c) 2012, NVIDIA Corporation.
*
* Author: Laxman Dewangan <ldewangan@nvidia.com>
*
* 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.
*
* This program is distributed "as is" WITHOUT ANY WARRANTY of any kind,
* whether express or implied; 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/delay.h>
#include <linux/err.h>
#include <linux/init.h>
#include <linux/kernel.h>
#include <linux/mfd/tps80031.h>
#include <linux/module.h>
#include <linux/platform_device.h>
#include <linux/regulator/driver.h>
#include <linux/regulator/machine.h>
#include <linux/slab.h>
/* Flags for DCDC Voltage reading */
#define DCDC_OFFSET_EN BIT(0)
#define DCDC_EXTENDED_EN BIT(1)
#define TRACK_MODE_ENABLE BIT(2)
#define SMPS_MULTOFFSET_VIO BIT(1)
#define SMPS_MULTOFFSET_SMPS1 BIT(3)
#define SMPS_MULTOFFSET_SMPS2 BIT(4)
#define SMPS_MULTOFFSET_SMPS3 BIT(6)
#define SMPS_MULTOFFSET_SMPS4 BIT(0)
#define SMPS_CMD_MASK 0xC0
#define SMPS_VSEL_MASK 0x3F
#define LDO_VSEL_MASK 0x1F
#define LDO_TRACK_VSEL_MASK 0x3F
#define MISC2_LDOUSB_IN_VSYS BIT(4)
#define MISC2_LDOUSB_IN_PMID BIT(3)
#define MISC2_LDOUSB_IN_MASK 0x18
#define MISC2_LDO3_SEL_VIB_VAL BIT(0)
#define MISC2_LDO3_SEL_VIB_MASK 0x1
#define BOOST_HW_PWR_EN BIT(5)
#define BOOST_HW_PWR_EN_MASK BIT(5)
#define OPA_MODE_EN BIT(6)
#define OPA_MODE_EN_MASK BIT(6)
#define USB_VBUS_CTRL_SET 0x04
#define USB_VBUS_CTRL_CLR 0x05
#define VBUS_DISCHRG 0x20
struct tps80031_regulator_info {
/* Regulator register address.*/
u8 trans_reg;
u8 state_reg;
u8 force_reg;
u8 volt_reg;
u8 volt_id;
/*Power request bits */
int preq_bit;
/* used by regulator core */
struct regulator_desc desc;
};
struct tps80031_regulator {
struct device *dev;
struct tps80031_regulator_info *rinfo;
u8 device_flags;
unsigned int config_flags;
unsigned int ext_ctrl_flag;
};
static inline struct device *to_tps80031_dev(struct regulator_dev *rdev)
{
return rdev_get_dev(rdev)->parent->parent;
}
static int tps80031_reg_is_enabled(struct regulator_dev *rdev)
{
struct tps80031_regulator *ri = rdev_get_drvdata(rdev);
struct device *parent = to_tps80031_dev(rdev);
u8 reg_val;
int ret;
if (ri->ext_ctrl_flag & TPS80031_EXT_PWR_REQ)
return true;
ret = tps80031_read(parent, TPS80031_SLAVE_ID1, ri->rinfo->state_reg,
®_val);
if (ret < 0) {
dev_err(&rdev->dev, "Reg 0x%02x read failed, err = %d\n",
ri->rinfo->state_reg, ret);
return ret;
}
return (reg_val & TPS80031_STATE_MASK) == TPS80031_STATE_ON;
}
static int tps80031_reg_enable(struct regulator_dev *rdev)
{
struct tps80031_regulator *ri = rdev_get_drvdata(rdev);
struct device *parent = to_tps80031_dev(rdev);
int ret;
if (ri->ext_ctrl_flag & TPS80031_EXT_PWR_REQ)
return 0;
ret = tps80031_update(parent, TPS80031_SLAVE_ID1, ri->rinfo->state_reg,
TPS80031_STATE_ON, TPS80031_STATE_MASK);
if (ret < 0) {
dev_err(&rdev->dev, "Reg 0x%02x update failed, err = %d\n",
ri->rinfo->state_reg, ret);
return ret;
}
return ret;
}
static int tps80031_reg_disable(struct regulator_dev *rdev)
{
struct tps80031_regulator *ri = rdev_get_drvdata(rdev);
struct device *parent = to_tps80031_dev(rdev);
int ret;
if (ri->ext_ctrl_flag & TPS80031_EXT_PWR_REQ)
return 0;
ret = tps80031_update(parent, TPS80031_SLAVE_ID1, ri->rinfo->state_reg,
TPS80031_STATE_OFF, TPS80031_STATE_MASK);
if (ret < 0)
dev_err(&rdev->dev, "Reg 0x%02x update failed, err = %d\n",
ri->rinfo->state_reg, ret);
return ret;
}
/* DCDC voltages for the selector of 58 to 63 */
static const int tps80031_dcdc_voltages[4][5] = {
{ 1350, 1500, 1800, 1900, 2100},
{ 1350, 1500, 1800, 1900, 2100},
{ 2084, 2315, 2778, 2932, 3241},
{ 4167, 2315, 2778, 2932, 3241},
};
static int tps80031_dcdc_list_voltage(struct regulator_dev *rdev, unsigned sel)
{
struct tps80031_regulator *ri = rdev_get_drvdata(rdev);
int volt_index = ri->device_flags & 0x3;
if (sel == 0)
return 0;
else if (sel < 58)
return regulator_list_voltage_linear(rdev, sel - 1);
else
return tps80031_dcdc_voltages[volt_index][sel - 58] * 1000;
}
static int tps80031_dcdc_set_voltage_sel(struct regulator_dev *rdev,
unsigned vsel)
{
struct tps80031_regulator *ri = rdev_get_drvdata(rdev);
struct device *parent = to_tps80031_dev(rdev);
int ret;
u8 reg_val;
if (ri->rinfo->force_reg) {
ret = tps80031_read(parent, ri->rinfo->volt_id,
ri->rinfo->force_reg, ®_val);
if (ret < 0) {
dev_err(ri->dev, "reg 0x%02x read failed, e = %d\n",
ri->rinfo->force_reg, ret);
return ret;
}
if (!(reg_val & SMPS_CMD_MASK)) {
ret = tps80031_update(parent, ri->rinfo->volt_id,
ri->rinfo->force_reg, vsel, SMPS_VSEL_MASK);
if (ret < 0)
dev_err(ri->dev,
"reg 0x%02x update failed, e = %d\n",
ri->rinfo->force_reg, ret);
return ret;
}
}
ret = tps80031_update(parent, ri->rinfo->volt_id,
ri->rinfo->volt_reg, vsel, SMPS_VSEL_MASK);
if (ret < 0)
dev_err(ri->
|