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459 lines
12 KiB
459 lines
12 KiB
// SPDX-License-Identifier: GPL-2.0-only |
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/* |
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* Regulator driver for National Semiconductors LP3971 PMIC chip |
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* |
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* Copyright (C) 2009 Samsung Electronics |
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* Author: Marek Szyprowski <[email protected]> |
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* |
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* Based on wm8350.c |
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*/ |
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#include <linux/bug.h> |
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#include <linux/err.h> |
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#include <linux/i2c.h> |
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#include <linux/kernel.h> |
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#include <linux/module.h> |
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#include <linux/regulator/driver.h> |
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#include <linux/regulator/lp3971.h> |
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#include <linux/slab.h> |
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struct lp3971 { |
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struct device *dev; |
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struct mutex io_lock; |
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struct i2c_client *i2c; |
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}; |
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static u8 lp3971_reg_read(struct lp3971 *lp3971, u8 reg); |
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static int lp3971_set_bits(struct lp3971 *lp3971, u8 reg, u16 mask, u16 val); |
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#define LP3971_SYS_CONTROL1_REG 0x07 |
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/* System control register 1 initial value, |
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bits 4 and 5 are EPROM programmable */ |
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#define SYS_CONTROL1_INIT_VAL 0x40 |
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#define SYS_CONTROL1_INIT_MASK 0xCF |
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#define LP3971_BUCK_VOL_ENABLE_REG 0x10 |
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#define LP3971_BUCK_VOL_CHANGE_REG 0x20 |
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/* Voltage control registers shift: |
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LP3971_BUCK1 -> 0 |
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LP3971_BUCK2 -> 4 |
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LP3971_BUCK3 -> 6 |
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*/ |
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#define BUCK_VOL_CHANGE_SHIFT(x) (((!!x) << 2) | (x & ~0x01)) |
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#define BUCK_VOL_CHANGE_FLAG_GO 0x01 |
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#define BUCK_VOL_CHANGE_FLAG_TARGET 0x02 |
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#define BUCK_VOL_CHANGE_FLAG_MASK 0x03 |
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#define LP3971_BUCK1_BASE 0x23 |
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#define LP3971_BUCK2_BASE 0x29 |
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#define LP3971_BUCK3_BASE 0x32 |
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static const int buck_base_addr[] = { |
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LP3971_BUCK1_BASE, |
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LP3971_BUCK2_BASE, |
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LP3971_BUCK3_BASE, |
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}; |
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#define LP3971_BUCK_TARGET_VOL1_REG(x) (buck_base_addr[x]) |
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#define LP3971_BUCK_TARGET_VOL2_REG(x) (buck_base_addr[x]+1) |
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static const unsigned int buck_voltage_map[] = { |
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0, 800000, 850000, 900000, 950000, 1000000, 1050000, 1100000, |
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1150000, 1200000, 1250000, 1300000, 1350000, 1400000, 1450000, 1500000, |
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1550000, 1600000, 1650000, 1700000, 1800000, 1900000, 2500000, 2800000, |
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3000000, 3300000, |
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}; |
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#define BUCK_TARGET_VOL_MASK 0x3f |
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#define LP3971_BUCK_RAMP_REG(x) (buck_base_addr[x]+2) |
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#define LP3971_LDO_ENABLE_REG 0x12 |
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#define LP3971_LDO_VOL_CONTR_BASE 0x39 |
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/* Voltage control registers: |
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LP3971_LDO1 -> LP3971_LDO_VOL_CONTR_BASE + 0 |
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LP3971_LDO2 -> LP3971_LDO_VOL_CONTR_BASE + 0 |
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LP3971_LDO3 -> LP3971_LDO_VOL_CONTR_BASE + 1 |
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LP3971_LDO4 -> LP3971_LDO_VOL_CONTR_BASE + 1 |
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LP3971_LDO5 -> LP3971_LDO_VOL_CONTR_BASE + 2 |
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*/ |
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#define LP3971_LDO_VOL_CONTR_REG(x) (LP3971_LDO_VOL_CONTR_BASE + (x >> 1)) |
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/* Voltage control registers shift: |
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LP3971_LDO1 -> 0, LP3971_LDO2 -> 4 |
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LP3971_LDO3 -> 0, LP3971_LDO4 -> 4 |
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LP3971_LDO5 -> 0 |
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*/ |
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#define LDO_VOL_CONTR_SHIFT(x) ((x & 1) << 2) |
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#define LDO_VOL_CONTR_MASK 0x0f |
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static const unsigned int ldo45_voltage_map[] = { |
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1000000, 1050000, 1100000, 1150000, 1200000, 1250000, 1300000, 1350000, |
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1400000, 1500000, 1800000, 1900000, 2500000, 2800000, 3000000, 3300000, |
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}; |
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static const unsigned int ldo123_voltage_map[] = { |
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1800000, 1900000, 2000000, 2100000, 2200000, 2300000, 2400000, 2500000, |
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2600000, 2700000, 2800000, 2900000, 3000000, 3100000, 3200000, 3300000, |
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}; |
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#define LDO_VOL_MIN_IDX 0x00 |
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#define LDO_VOL_MAX_IDX 0x0f |
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static int lp3971_ldo_is_enabled(struct regulator_dev *dev) |
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{ |
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struct lp3971 *lp3971 = rdev_get_drvdata(dev); |
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int ldo = rdev_get_id(dev) - LP3971_LDO1; |
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u16 mask = 1 << (1 + ldo); |
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u16 val; |
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val = lp3971_reg_read(lp3971, LP3971_LDO_ENABLE_REG); |
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return (val & mask) != 0; |
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} |
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static int lp3971_ldo_enable(struct regulator_dev *dev) |
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{ |
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struct lp3971 *lp3971 = rdev_get_drvdata(dev); |
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int ldo = rdev_get_id(dev) - LP3971_LDO1; |
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u16 mask = 1 << (1 + ldo); |
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return lp3971_set_bits(lp3971, LP3971_LDO_ENABLE_REG, mask, mask); |
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} |
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static int lp3971_ldo_disable(struct regulator_dev *dev) |
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{ |
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struct lp3971 *lp3971 = rdev_get_drvdata(dev); |
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int ldo = rdev_get_id(dev) - LP3971_LDO1; |
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u16 mask = 1 << (1 + ldo); |
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return lp3971_set_bits(lp3971, LP3971_LDO_ENABLE_REG, mask, 0); |
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} |
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static int lp3971_ldo_get_voltage_sel(struct regulator_dev *dev) |
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{ |
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struct lp3971 *lp3971 = rdev_get_drvdata(dev); |
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int ldo = rdev_get_id(dev) - LP3971_LDO1; |
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u16 val, reg; |
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reg = lp3971_reg_read(lp3971, LP3971_LDO_VOL_CONTR_REG(ldo)); |
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val = (reg >> LDO_VOL_CONTR_SHIFT(ldo)) & LDO_VOL_CONTR_MASK; |
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return val; |
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} |
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static int lp3971_ldo_set_voltage_sel(struct regulator_dev *dev, |
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unsigned int selector) |
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{ |
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struct lp3971 *lp3971 = rdev_get_drvdata(dev); |
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int ldo = rdev_get_id(dev) - LP3971_LDO1; |
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return lp3971_set_bits(lp3971, LP3971_LDO_VOL_CONTR_REG(ldo), |
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LDO_VOL_CONTR_MASK << LDO_VOL_CONTR_SHIFT(ldo), |
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selector << LDO_VOL_CONTR_SHIFT(ldo)); |
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} |
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static const struct regulator_ops lp3971_ldo_ops = { |
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.list_voltage = regulator_list_voltage_table, |
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.map_voltage = regulator_map_voltage_ascend, |
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.is_enabled = lp3971_ldo_is_enabled, |
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.enable = lp3971_ldo_enable, |
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.disable = lp3971_ldo_disable, |
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.get_voltage_sel = lp3971_ldo_get_voltage_sel, |
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.set_voltage_sel = lp3971_ldo_set_voltage_sel, |
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}; |
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static int lp3971_dcdc_is_enabled(struct regulator_dev *dev) |
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{ |
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struct lp3971 *lp3971 = rdev_get_drvdata(dev); |
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int buck = rdev_get_id(dev) - LP3971_DCDC1; |
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u16 mask = 1 << (buck * 2); |
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u16 val; |
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val = lp3971_reg_read(lp3971, LP3971_BUCK_VOL_ENABLE_REG); |
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return (val & mask) != 0; |
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} |
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static int lp3971_dcdc_enable(struct regulator_dev *dev) |
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{ |
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struct lp3971 *lp3971 = rdev_get_drvdata(dev); |
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int buck = rdev_get_id(dev) - LP3971_DCDC1; |
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u16 mask = 1 << (buck * 2); |
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return lp3971_set_bits(lp3971, LP3971_BUCK_VOL_ENABLE_REG, mask, mask); |
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} |
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static int lp3971_dcdc_disable(struct regulator_dev *dev) |
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{ |
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struct lp3971 *lp3971 = rdev_get_drvdata(dev); |
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int buck = rdev_get_id(dev) - LP3971_DCDC1; |
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u16 mask = 1 << (buck * 2); |
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return lp3971_set_bits(lp3971, LP3971_BUCK_VOL_ENABLE_REG, mask, 0); |
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} |
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static int lp3971_dcdc_get_voltage_sel(struct regulator_dev *dev) |
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{ |
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struct lp3971 *lp3971 = rdev_get_drvdata(dev); |
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int buck = rdev_get_id(dev) - LP3971_DCDC1; |
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u16 reg; |
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reg = lp3971_reg_read(lp3971, LP3971_BUCK_TARGET_VOL1_REG(buck)); |
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reg &= BUCK_TARGET_VOL_MASK; |
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return reg; |
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} |
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static int lp3971_dcdc_set_voltage_sel(struct regulator_dev *dev, |
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unsigned int selector) |
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{ |
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struct lp3971 *lp3971 = rdev_get_drvdata(dev); |
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int buck = rdev_get_id(dev) - LP3971_DCDC1; |
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int ret; |
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ret = lp3971_set_bits(lp3971, LP3971_BUCK_TARGET_VOL1_REG(buck), |
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BUCK_TARGET_VOL_MASK, selector); |
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if (ret) |
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return ret; |
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ret = lp3971_set_bits(lp3971, LP3971_BUCK_VOL_CHANGE_REG, |
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BUCK_VOL_CHANGE_FLAG_MASK << BUCK_VOL_CHANGE_SHIFT(buck), |
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BUCK_VOL_CHANGE_FLAG_GO << BUCK_VOL_CHANGE_SHIFT(buck)); |
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if (ret) |
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return ret; |
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return lp3971_set_bits(lp3971, LP3971_BUCK_VOL_CHANGE_REG, |
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BUCK_VOL_CHANGE_FLAG_MASK << BUCK_VOL_CHANGE_SHIFT(buck), |
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0 << BUCK_VOL_CHANGE_SHIFT(buck)); |
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} |
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static const struct regulator_ops lp3971_dcdc_ops = { |
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.list_voltage = regulator_list_voltage_table, |
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.map_voltage = regulator_map_voltage_ascend, |
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.is_enabled = lp3971_dcdc_is_enabled, |
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.enable = lp3971_dcdc_enable, |
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.disable = lp3971_dcdc_disable, |
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.get_voltage_sel = lp3971_dcdc_get_voltage_sel, |
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.set_voltage_sel = lp3971_dcdc_set_voltage_sel, |
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}; |
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static const struct regulator_desc regulators[] = { |
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{ |
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.name = "LDO1", |
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.id = LP3971_LDO1, |
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.ops = &lp3971_ldo_ops, |
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.n_voltages = ARRAY_SIZE(ldo123_voltage_map), |
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.volt_table = ldo123_voltage_map, |
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.type = REGULATOR_VOLTAGE, |
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.owner = THIS_MODULE, |
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}, |
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{ |
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.name = "LDO2", |
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.id = LP3971_LDO2, |
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.ops = &lp3971_ldo_ops, |
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.n_voltages = ARRAY_SIZE(ldo123_voltage_map), |
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.volt_table = ldo123_voltage_map, |
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.type = REGULATOR_VOLTAGE, |
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.owner = THIS_MODULE, |
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}, |
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{ |
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.name = "LDO3", |
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.id = LP3971_LDO3, |
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.ops = &lp3971_ldo_ops, |
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.n_voltages = ARRAY_SIZE(ldo123_voltage_map), |
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.volt_table = ldo123_voltage_map, |
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.type = REGULATOR_VOLTAGE, |
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.owner = THIS_MODULE, |
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}, |
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{ |
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.name = "LDO4", |
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.id = LP3971_LDO4, |
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.ops = &lp3971_ldo_ops, |
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.n_voltages = ARRAY_SIZE(ldo45_voltage_map), |
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.volt_table = ldo45_voltage_map, |
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.type = REGULATOR_VOLTAGE, |
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.owner = THIS_MODULE, |
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}, |
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{ |
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.name = "LDO5", |
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.id = LP3971_LDO5, |
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.ops = &lp3971_ldo_ops, |
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.n_voltages = ARRAY_SIZE(ldo45_voltage_map), |
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.volt_table = ldo45_voltage_map, |
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.type = REGULATOR_VOLTAGE, |
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.owner = THIS_MODULE, |
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}, |
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{ |
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.name = "DCDC1", |
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.id = LP3971_DCDC1, |
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.ops = &lp3971_dcdc_ops, |
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.n_voltages = ARRAY_SIZE(buck_voltage_map), |
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.volt_table = buck_voltage_map, |
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.type = REGULATOR_VOLTAGE, |
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.owner = THIS_MODULE, |
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}, |
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{ |
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.name = "DCDC2", |
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.id = LP3971_DCDC2, |
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.ops = &lp3971_dcdc_ops, |
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.n_voltages = ARRAY_SIZE(buck_voltage_map), |
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.volt_table = buck_voltage_map, |
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.type = REGULATOR_VOLTAGE, |
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.owner = THIS_MODULE, |
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}, |
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{ |
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.name = "DCDC3", |
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.id = LP3971_DCDC3, |
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.ops = &lp3971_dcdc_ops, |
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.n_voltages = ARRAY_SIZE(buck_voltage_map), |
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.volt_table = buck_voltage_map, |
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.type = REGULATOR_VOLTAGE, |
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.owner = THIS_MODULE, |
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}, |
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}; |
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static int lp3971_i2c_read(struct i2c_client *i2c, char reg, int count, |
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u16 *dest) |
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{ |
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int ret; |
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if (count != 1) |
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return -EIO; |
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ret = i2c_smbus_read_byte_data(i2c, reg); |
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if (ret < 0) |
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return ret; |
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*dest = ret; |
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return 0; |
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} |
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static int lp3971_i2c_write(struct i2c_client *i2c, char reg, int count, |
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const u16 *src) |
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{ |
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if (count != 1) |
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return -EIO; |
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return i2c_smbus_write_byte_data(i2c, reg, *src); |
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} |
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static u8 lp3971_reg_read(struct lp3971 *lp3971, u8 reg) |
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{ |
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u16 val = 0; |
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mutex_lock(&lp3971->io_lock); |
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lp3971_i2c_read(lp3971->i2c, reg, 1, &val); |
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dev_dbg(lp3971->dev, "reg read 0x%02x -> 0x%02x\n", (int)reg, |
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(unsigned)val&0xff); |
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mutex_unlock(&lp3971->io_lock); |
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return val & 0xff; |
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} |
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static int lp3971_set_bits(struct lp3971 *lp3971, u8 reg, u16 mask, u16 val) |
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{ |
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u16 tmp; |
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int ret; |
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mutex_lock(&lp3971->io_lock); |
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ret = lp3971_i2c_read(lp3971->i2c, reg, 1, &tmp); |
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if (ret == 0) { |
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tmp = (tmp & ~mask) | val; |
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ret = lp3971_i2c_write(lp3971->i2c, reg, 1, &tmp); |
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dev_dbg(lp3971->dev, "reg write 0x%02x -> 0x%02x\n", (int)reg, |
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(unsigned)val&0xff); |
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} |
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mutex_unlock(&lp3971->io_lock); |
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return ret; |
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} |
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static int setup_regulators(struct lp3971 *lp3971, |
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struct lp3971_platform_data *pdata) |
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{ |
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int i, err; |
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/* Instantiate the regulators */ |
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for (i = 0; i < pdata->num_regulators; i++) { |
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struct regulator_config config = { }; |
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struct lp3971_regulator_subdev *reg = &pdata->regulators[i]; |
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struct regulator_dev *rdev; |
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config.dev = lp3971->dev; |
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config.init_data = reg->initdata; |
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config.driver_data = lp3971; |
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rdev = devm_regulator_register(lp3971->dev, |
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®ulators[reg->id], &config); |
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if (IS_ERR(rdev)) { |
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err = PTR_ERR(rdev); |
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dev_err(lp3971->dev, "regulator init failed: %d\n", |
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err); |
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return err; |
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} |
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} |
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return 0; |
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} |
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static int lp3971_i2c_probe(struct i2c_client *i2c) |
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{ |
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struct lp3971 *lp3971; |
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struct lp3971_platform_data *pdata = dev_get_platdata(&i2c->dev); |
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int ret; |
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u16 val; |
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if (!pdata) { |
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dev_dbg(&i2c->dev, "No platform init data supplied\n"); |
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return -ENODEV; |
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} |
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lp3971 = devm_kzalloc(&i2c->dev, sizeof(struct lp3971), GFP_KERNEL); |
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if (lp3971 == NULL) |
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return -ENOMEM; |
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lp3971->i2c = i2c; |
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lp3971->dev = &i2c->dev; |
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mutex_init(&lp3971->io_lock); |
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/* Detect LP3971 */ |
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ret = lp3971_i2c_read(i2c, LP3971_SYS_CONTROL1_REG, 1, &val); |
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if (ret == 0 && (val & SYS_CONTROL1_INIT_MASK) != SYS_CONTROL1_INIT_VAL) |
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ret = -ENODEV; |
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if (ret < 0) { |
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dev_err(&i2c->dev, "failed to detect device\n"); |
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return ret; |
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} |
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ret = setup_regulators(lp3971, pdata); |
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if (ret < 0) |
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return ret; |
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i2c_set_clientdata(i2c, lp3971); |
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return 0; |
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} |
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static const struct i2c_device_id lp3971_i2c_id[] = { |
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{ "lp3971", 0 }, |
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{ } |
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}; |
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MODULE_DEVICE_TABLE(i2c, lp3971_i2c_id); |
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static struct i2c_driver lp3971_i2c_driver = { |
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.driver = { |
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.name = "LP3971", |
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}, |
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.probe_new = lp3971_i2c_probe, |
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.id_table = lp3971_i2c_id, |
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}; |
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module_i2c_driver(lp3971_i2c_driver); |
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MODULE_LICENSE("GPL"); |
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MODULE_AUTHOR("Marek Szyprowski <[email protected]>"); |
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MODULE_DESCRIPTION("LP3971 PMIC driver");
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