/*
* Regulator driver for TPS6524x PMIC
*
* Copyright (C) 2010 Texas Instruments
*
* 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.
*/
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/err.h>
#include <linux/errno.h>
#include <linux/slab.h>
#include <linux/spi/spi.h>
#include <linux/regulator/driver.h>
#include <linux/regulator/machine.h>
#define REG_LDO_SET 0 x0
#define LDO_ILIM_MASK 1 /* 0 = 400-800, 1 = 900-1500 */
#define LDO_VSEL_MASK 0 x0f
#define LDO2_ILIM_SHIFT 12
#define LDO2_VSEL_SHIFT 4
#define LDO1_ILIM_SHIFT 8
#define LDO1_VSEL_SHIFT 0
#define REG_BLOCK_EN 0 x1
#define BLOCK_MASK 1
#define BLOCK_LDO1_SHIFT 0
#define BLOCK_LDO2_SHIFT 1
#define BLOCK_LCD_SHIFT 2
#define BLOCK_USB_SHIFT 3
#define REG_DCDC_SET 0 x2
#define DCDC_VDCDC_MASK 0 x1f
#define DCDC_VDCDC1_SHIFT 0
#define DCDC_VDCDC2_SHIFT 5
#define DCDC_VDCDC3_SHIFT 10
#define REG_DCDC_EN 0 x3
#define DCDCDCDC_EN_MASK 0 x1
#define DCDCDCDC1_EN_SHIFT 0
#define DCDCDCDC1_PG_MSK BIT(1 )
#define DCDCDCDC2_EN_SHIFT 2
#define DCDCDCDC2_PG_MSK BIT(3 )
#define DCDCDCDC3_EN_SHIFT 4
#define DCDCDCDC3_PG_MSK BIT(5 )
#define REG_USB 0 x4
#define USB_ILIM_SHIFT 0
#define USB_ILIM_MASK 0 x3
#define USB_TSD_SHIFT 2
#define USB_TSD_MASK 0 x3
#define USB_TWARN_SHIFT 4
#define USB_TWARN_MASK 0 x3
#define USB_IWARN_SD BIT(6 )
#define USB_FAST_LOOP BIT(7 )
#define REG_ALARM 0 x5
#define ALARM_LDO1 BIT(0 )
#define ALARM_DCDC1 BIT(1 )
#define ALARM_DCDC2 BIT(2 )
#define ALARM_DCDC3 BIT(3 )
#define ALARM_LDO2 BIT(4 )
#define ALARM_USB_WARN BIT(5 )
#define ALARM_USB_ALARM BIT(6 )
#define ALARM_LCD BIT(9 )
#define ALARM_TEMP_WARM BIT(10 )
#define ALARM_TEMP_HOT BIT(11 )
#define ALARM_NRST BIT(14 )
#define ALARM_POWERUP BIT(15 )
#define REG_INT_ENABLE 0 x6
#define INT_LDO1 BIT(0 )
#define INT_DCDC1 BIT(1 )
#define INT_DCDC2 BIT(2 )
#define INT_DCDC3 BIT(3 )
#define INT_LDO2 BIT(4 )
#define INT_USB_WARN BIT(5 )
#define INT_USB_ALARM BIT(6 )
#define INT_LCD BIT(9 )
#define INT_TEMP_WARM BIT(10 )
#define INT_TEMP_HOT BIT(11 )
#define INT_GLOBAL_EN BIT(15 )
#define REG_INT_STATUS 0 x7
#define STATUS_LDO1 BIT(0 )
#define STATUS_DCDC1 BIT(1 )
#define STATUS_DCDC2 BIT(2 )
#define STATUS_DCDC3 BIT(3 )
#define STATUS_LDO2 BIT(4 )
#define STATUS_USB_WARN BIT(5 )
#define STATUS_USB_ALARM BIT(6 )
#define STATUS_LCD BIT(9 )
#define STATUS_TEMP_WARM BIT(10 )
#define STATUS_TEMP_HOT BIT(11 )
#define REG_SOFTWARE_RESET 0 xb
#define REG_WRITE_ENABLE 0 xd
#define REG_REV_ID 0 xf
#define N_DCDC 3
#define N_LDO 2
#define N_SWITCH 2
#define N_REGULATORS (N_DCDC + N_LDO + N_SWITCH)
#define CMD_READ(reg) ((reg) << 6 )
#define CMD_WRITE(reg) (BIT(5 ) | (reg) << 6 )
#define STAT_CLK BIT(3 )
#define STAT_WRITE BIT(2 )
#define STAT_INVALID BIT(1 )
#define STAT_WP BIT(0 )
struct field {
int reg;
int shift;
int mask;
};
struct supply_info {
const char *name;
int n_voltages;
const unsigned int *voltages;
int n_ilimsels;
const unsigned int *ilimsels;
struct field enable, voltage, ilimsel;
};
struct tps6524x {
struct device *dev;
struct spi_device *spi;
struct mutex lock;
struct regulator_desc desc[N_REGULATORS];
};
static int __read_reg(struct tps6524x *hw, int reg)
{
int error = 0 ;
u16 cmd = CMD_READ(reg), in;
u8 status;
struct spi_message m;
struct spi_transfer t[3 ];
spi_message_init(&m);
memset(t, 0 , sizeof (t));
t[0 ].tx_buf = &cmd;
t[0 ].len = 2 ;
t[0 ].bits_per_word = 12 ;
spi_message_add_tail(&t[0 ], &m);
t[1 ].rx_buf = ∈
t[1 ].len = 2 ;
t[1 ].bits_per_word = 16 ;
spi_message_add_tail(&t[1 ], &m);
t[2 ].rx_buf = &status;
t[2 ].len = 1 ;
t[2 ].bits_per_word = 4 ;
spi_message_add_tail(&t[2 ], &m);
error = spi_sync(hw->spi, &m);
if (error < 0 )
return error;
dev_dbg(hw->dev, "read reg %d, data %x, status %x\n" ,
reg, in, status);
if (!(status & STAT_CLK) || (status & STAT_WRITE))
return -EIO;
if (status & STAT_INVALID)
return -EINVAL;
return in;
}
static int read_reg(struct tps6524x *hw, int reg)
{
int ret;
mutex_lock(&hw->lock);
ret = __read_reg(hw, reg);
mutex_unlock(&hw->lock);
return ret;
}
static int __write_reg(struct tps6524x *hw, int reg, int val)
{
int error = 0 ;
u16 cmd = CMD_WRITE(reg), out = val;
u8 status;
struct spi_message m;
struct spi_transfer t[3 ];
spi_message_init(&m);
memset(t, 0 , sizeof (t));
t[0 ].tx_buf = &cmd;
t[0 ].len = 2 ;
t[0 ].bits_per_word = 12 ;
spi_message_add_tail(&t[0 ], &m);
t[1 ].tx_buf = &out;
t[1 ].len = 2 ;
t[1 ].bits_per_word = 16 ;
spi_message_add_tail(&t[1 ], &m);
t[2 ].rx_buf = &status;
t[2 ].len = 1 ;
t[2 ].bits_per_word = 4 ;
spi_message_add_tail(&t[2 ], &m);
error = spi_sync(hw->spi, &m);
if (error < 0 )
return error;
dev_dbg(hw->dev, "wrote reg %d, data %x, status %x\n" ,
reg, out, status);
if (!(status & STAT_CLK) || !(status & STAT_WRITE))
return -EIO;
if (status & (STAT_INVALID | STAT_WP))
return -EINVAL;
return error;
}
static int __rmw_reg(struct tps6524x *hw, int reg, int mask, int val)
{
int ret;
ret = __read_reg(hw, reg);
if (ret < 0 )
return ret;
ret &= ~mask;
ret |= val;
ret = __write_reg(hw, reg, ret);
return (ret < 0 ) ? ret : 0 ;
}
static int rmw_protect(struct tps6524x *hw, int reg, int mask, int val)
{
int ret;
mutex_lock(&hw->lock);
ret = __write_reg(hw, REG_WRITE_ENABLE, 1 );
if (ret) {
dev_err(hw->dev, "failed to set write enable\n" );
goto error;
}
ret = __rmw_reg(hw, reg, mask, val);
if (ret)
dev_err(hw->dev, "failed to rmw register %d\n" , reg);
ret = __write_reg(hw, REG_WRITE_ENABLE, 0 );
if (ret) {
dev_err(hw->dev, "failed to clear write enable\n" );
goto error;
}
error:
mutex_unlock(&hw->lock);
return ret;
}
static int read_field(struct tps6524x *hw, const struct field *field)
{
int tmp;
tmp = read_reg(hw, field->reg);
if (tmp < 0 )
return tmp;
return (tmp >> field->shift) & field->mask;
}
static int write_field(struct tps6524x *hw, const struct field *field,
int val)
{
if (val & ~field->mask)
return -EOVERFLOW;
return rmw_protect(hw, field->reg,
field->mask << field->shift,
val << field->shift);
}
static const unsigned int dcdc1_voltages[] = {
800000 , 825000 , 850000 , 875000 ,
900000 , 925000 , 950000 , 975000 ,
1000000 , 1025000 , 1050000 , 1075000 ,
1100000 , 1125000 , 1150000 , 1175000 ,
1200000 , 1225000 , 1250000 , 1275000 ,
1300000 , 1325000 , 1350000 , 1375000 ,
1400000 , 1425000 , 1450000 , 1475000 ,
1500000 , 1525000 , 1550000 , 1575000 ,
};
static const unsigned int dcdc2_voltages[] = {
1400000 , 1450000 , 1500000 , 1550000 ,
1600000 , 1650000 , 1700000 , 1750000 ,
1800000 , 1850000 , 1900000 , 1950000 ,
2000000 , 2050000 , 2100000 , 2150000 ,
2200000 , 2250000 , 2300000 , 2350000 ,
2400000 , 2450000 , 2500000 , 2550000 ,
2600000 , 2650000 , 2700000 , 2750000 ,
2800000 , 2850000 , 2900000 , 2950000 ,
};
static const unsigned int dcdc3_voltages[] = {
2400000 , 2450000 , 2500000 , 2550000 , 2600000 ,
2650000 , 2700000 , 2750000 , 2800000 , 2850000 ,
2900000 , 2950000 , 3000000 , 3050000 , 3100000 ,
3150000 , 3200000 , 3250000 , 3300000 , 3350000 ,
3400000 , 3450000 , 3500000 , 3550000 , 3600000 ,
};
static const unsigned int ldo1_voltages[] = {
4300000 , 4350000 , 4400000 , 4450000 ,
4500000 , 4550000 , 4600000 , 4650000 ,
4700000 , 4750000 , 4800000 , 4850000 ,
4900000 , 4950000 , 5000000 , 5050000 ,
};
static const unsigned int ldo2_voltages[] = {
1100000 , 1150000 , 1200000 , 1250000 ,
1300000 , 1700000 , 1750000 , 1800000 ,
1850000 , 1900000 , 3150000 , 3200000 ,
3250000 , 3300000 , 3350000 , 3400000 ,
};
static const unsigned int fixed_5000000_voltage[] = {
5000000
};
static const unsigned int ldo_ilimsel[] = {
400000 , 1500000
};
static const unsigned int usb_ilimsel[] = {
200000 , 400000 , 800000 , 1000000
};
static const unsigned int fixed_2400000_ilimsel[] = {
2400000
};
static const unsigned int fixed_1200000_ilimsel[] = {
1200000
};
static const unsigned int fixed_400000_ilimsel[] = {
400000
};
#define __MK_FIELD(_reg, _mask, _shift) \
{ .reg = (_reg), .mask = (_mask), .shift = (_shift), }
static const struct supply_info supply_info[N_REGULATORS] = {
{
.name = "DCDC1" ,
.n_voltages = ARRAY_SIZE(dcdc1_voltages),
.voltages = dcdc1_voltages,
.n_ilimsels = ARRAY_SIZE(fixed_2400000_ilimsel),
.ilimsels = fixed_2400000_ilimsel,
.enable = __MK_FIELD(REG_DCDC_EN, DCDCDCDC_EN_MASK,
DCDCDCDC1_EN_SHIFT),
.voltage = __MK_FIELD(REG_DCDC_SET, DCDC_VDCDC_MASK,
DCDC_VDCDC1_SHIFT),
},
{
.name = "DCDC2" ,
.n_voltages = ARRAY_SIZE(dcdc2_voltages),
.voltages = dcdc2_voltages,
.n_ilimsels = ARRAY_SIZE(fixed_1200000_ilimsel),
.ilimsels = fixed_1200000_ilimsel,
.enable = __MK_FIELD(REG_DCDC_EN, DCDCDCDC_EN_MASK,
DCDCDCDC2_EN_SHIFT),
.voltage = __MK_FIELD(REG_DCDC_SET, DCDC_VDCDC_MASK,
DCDC_VDCDC2_SHIFT),
},
{
.name = "DCDC3" ,
.n_voltages = ARRAY_SIZE(dcdc3_voltages),
.voltages = dcdc3_voltages,
.n_ilimsels = ARRAY_SIZE(fixed_1200000_ilimsel),
.ilimsels = fixed_1200000_ilimsel,
.enable = __MK_FIELD(REG_DCDC_EN, DCDCDCDC_EN_MASK,
DCDCDCDC3_EN_SHIFT),
.voltage = __MK_FIELD(REG_DCDC_SET, DCDC_VDCDC_MASK,
DCDC_VDCDC3_SHIFT),
},
{
.name = "LDO1" ,
.n_voltages = ARRAY_SIZE(ldo1_voltages),
.voltages = ldo1_voltages,
.n_ilimsels = ARRAY_SIZE(ldo_ilimsel),
.ilimsels = ldo_ilimsel,
.enable = __MK_FIELD(REG_BLOCK_EN, BLOCK_MASK,
BLOCK_LDO1_SHIFT),
.voltage = __MK_FIELD(REG_LDO_SET, LDO_VSEL_MASK,
LDO1_VSEL_SHIFT),
.ilimsel = __MK_FIELD(REG_LDO_SET, LDO_ILIM_MASK,
LDO1_ILIM_SHIFT),
},
{
.name = "LDO2" ,
.n_voltages = ARRAY_SIZE(ldo2_voltages),
.voltages = ldo2_voltages,
.n_ilimsels = ARRAY_SIZE(ldo_ilimsel),
.ilimsels = ldo_ilimsel,
.enable = __MK_FIELD(REG_BLOCK_EN, BLOCK_MASK,
BLOCK_LDO2_SHIFT),
.voltage = __MK_FIELD(REG_LDO_SET, LDO_VSEL_MASK,
LDO2_VSEL_SHIFT),
.ilimsel = __MK_FIELD(REG_LDO_SET, LDO_ILIM_MASK,
LDO2_ILIM_SHIFT),
},
{
.name = "USB" ,
.n_voltages = ARRAY_SIZE(fixed_5000000_voltage),
.voltages = fixed_5000000_voltage,
.n_ilimsels = ARRAY_SIZE(usb_ilimsel),
.ilimsels = usb_ilimsel,
.enable = __MK_FIELD(REG_BLOCK_EN, BLOCK_MASK,
BLOCK_USB_SHIFT),
.ilimsel = __MK_FIELD(REG_USB, USB_ILIM_MASK,
USB_ILIM_SHIFT),
},
{
.name = "LCD" ,
.n_voltages = ARRAY_SIZE(fixed_5000000_voltage),
.voltages = fixed_5000000_voltage,
.n_ilimsels = ARRAY_SIZE(fixed_400000_ilimsel),
.ilimsels = fixed_400000_ilimsel,
.enable = __MK_FIELD(REG_BLOCK_EN, BLOCK_MASK,
BLOCK_LCD_SHIFT),
},
};
static int set_voltage_sel(struct regulator_dev *rdev, unsigned selector)
{
const struct supply_info *info;
struct tps6524x *hw;
hw = rdev_get_drvdata(rdev);
info = &supply_info[rdev_get_id(rdev)];
if (rdev->desc->n_voltages == 1 )
return -EINVAL;
return write_field(hw, &info->voltage, selector);
}
static int get_voltage_sel(struct regulator_dev *rdev)
{
const struct supply_info *info;
struct tps6524x *hw;
int ret;
hw = rdev_get_drvdata(rdev);
info = &supply_info[rdev_get_id(rdev)];
if (rdev->desc->n_voltages == 1 )
return 0 ;
ret = read_field(hw, &info->voltage);
if (ret < 0 )
return ret;
if (WARN_ON(ret >= info->n_voltages))
return -EIO;
return ret;
}
static int set_current_limit(struct regulator_dev *rdev, int min_uA,
int max_uA)
{
const struct supply_info *info;
struct tps6524x *hw;
int i;
hw = rdev_get_drvdata(rdev);
info = &supply_info[rdev_get_id(rdev)];
if (info->n_ilimsels == 1 )
return -EINVAL;
for (i = info->n_ilimsels - 1 ; i >= 0 ; i--) {
if (min_uA <= info->ilimsels[i] &&
max_uA >= info->ilimsels[i])
return write_field(hw, &info->ilimsel, i);
}
return -EINVAL;
}
static int get_current_limit(struct regulator_dev *rdev)
{
const struct supply_info *info;
struct tps6524x *hw;
int ret;
hw = rdev_get_drvdata(rdev);
info = &supply_info[rdev_get_id(rdev)];
if (info->n_ilimsels == 1 )
return info->ilimsels[0 ];
ret = read_field(hw, &info->ilimsel);
if (ret < 0 )
return ret;
if (WARN_ON(ret >= info->n_ilimsels))
return -EIO;
return info->ilimsels[ret];
}
static int enable_supply(struct regulator_dev *rdev)
{
const struct supply_info *info;
struct tps6524x *hw;
hw = rdev_get_drvdata(rdev);
info = &supply_info[rdev_get_id(rdev)];
return write_field(hw, &info->enable, 1 );
}
static int disable_supply(struct regulator_dev *rdev)
{
const struct supply_info *info;
struct tps6524x *hw;
hw = rdev_get_drvdata(rdev);
info = &supply_info[rdev_get_id(rdev)];
return write_field(hw, &info->enable, 0 );
}
static int is_supply_enabled(struct regulator_dev *rdev)
{
const struct supply_info *info;
struct tps6524x *hw;
hw = rdev_get_drvdata(rdev);
info = &supply_info[rdev_get_id(rdev)];
return read_field(hw, &info->enable);
}
static const struct regulator_ops regulator_ops = {
.is_enabled = is_supply_enabled,
.enable = enable_supply,
.disable = disable_supply,
.get_voltage_sel = get_voltage_sel,
.set_voltage_sel = set_voltage_sel,
.list_voltage = regulator_list_voltage_table,
.map_voltage = regulator_map_voltage_ascend,
.set_current_limit = set_current_limit,
.get_current_limit = get_current_limit,
};
static int pmic_probe(struct spi_device *spi)
{
struct tps6524x *hw;
struct device *dev = &spi->dev;
const struct supply_info *info = supply_info;
struct regulator_init_data *init_data;
struct regulator_config config = { };
struct regulator_dev *rdev;
int i;
init_data = dev_get_platdata(dev);
if (!init_data) {
dev_err(dev, "could not find regulator platform data\n" );
return -EINVAL;
}
hw = devm_kzalloc(&spi->dev, sizeof (struct tps6524x), GFP_KERNEL);
if (!hw)
return -ENOMEM;
spi_set_drvdata(spi, hw);
memset(hw, 0 , sizeof (struct tps6524x));
hw->dev = dev;
hw->spi = spi;
mutex_init(&hw->lock);
for (i = 0 ; i < N_REGULATORS; i++, info++, init_data++) {
hw->desc[i].name = info->name;
hw->desc[i].id = i;
hw->desc[i].n_voltages = info->n_voltages;
hw->desc[i].volt_table = info->voltages;
hw->desc[i].ops = ®ulator_ops;
hw->desc[i].type = REGULATOR_VOLTAGE;
hw->desc[i].owner = THIS_MODULE;
config.dev = dev;
config.init_data = init_data;
config.driver_data = hw;
rdev = devm_regulator_register(dev, &hw->desc[i], &config);
if (IS_ERR(rdev))
return PTR_ERR(rdev);
}
return 0 ;
}
static struct spi_driver pmic_driver = {
.probe = pmic_probe,
.driver = {
.name = "tps6524x" ,
.probe_type = PROBE_PREFER_ASYNCHRONOUS,
},
};
module_spi_driver(pmic_driver);
MODULE_DESCRIPTION("TPS6524X PMIC Driver" );
MODULE_AUTHOR("Cyril Chemparathy" );
MODULE_LICENSE("GPL" );
MODULE_ALIAS("spi:tps6524x" );
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