mirror of
https://github.com/edk2-porting/linux-next.git
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40e1d79ee1
This is harmless but if lp3971_i2c_read() fails then "tmp" can be uninitialized. Silence the warning by moving the error handling up a line. Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com> Signed-off-by: Mark Brown <broonie@kernel.org>
465 lines
12 KiB
C
465 lines
12 KiB
C
/*
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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 <m.szyprowski@samsung.com>
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*
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* Based on wm8350.c
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*
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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 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 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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const struct i2c_device_id *id)
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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 = 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 <m.szyprowski@samsung.com>");
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MODULE_DESCRIPTION("LP3971 PMIC driver");
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