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568 lines
14 KiB
568 lines
14 KiB
// SPDX-License-Identifier: GPL-2.0-only |
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/* |
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* Regulator driver for National Semiconductors LP3972 PMIC chip |
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* |
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* Based on lp3971.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/module.h> |
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#include <linux/kernel.h> |
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#include <linux/regulator/driver.h> |
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#include <linux/regulator/lp3972.h> |
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#include <linux/slab.h> |
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struct lp3972 { |
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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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/* LP3972 Control Registers */ |
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#define LP3972_SCR_REG 0x07 |
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#define LP3972_OVER1_REG 0x10 |
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#define LP3972_OVSR1_REG 0x11 |
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#define LP3972_OVER2_REG 0x12 |
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#define LP3972_OVSR2_REG 0x13 |
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#define LP3972_VCC1_REG 0x20 |
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#define LP3972_ADTV1_REG 0x23 |
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#define LP3972_ADTV2_REG 0x24 |
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#define LP3972_AVRC_REG 0x25 |
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#define LP3972_CDTC1_REG 0x26 |
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#define LP3972_CDTC2_REG 0x27 |
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#define LP3972_SDTV1_REG 0x29 |
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#define LP3972_SDTV2_REG 0x2A |
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#define LP3972_MDTV1_REG 0x32 |
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#define LP3972_MDTV2_REG 0x33 |
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#define LP3972_L2VCR_REG 0x39 |
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#define LP3972_L34VCR_REG 0x3A |
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#define LP3972_SCR1_REG 0x80 |
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#define LP3972_SCR2_REG 0x81 |
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#define LP3972_OEN3_REG 0x82 |
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#define LP3972_OSR3_REG 0x83 |
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#define LP3972_LOER4_REG 0x84 |
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#define LP3972_B2TV_REG 0x85 |
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#define LP3972_B3TV_REG 0x86 |
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#define LP3972_B32RC_REG 0x87 |
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#define LP3972_ISRA_REG 0x88 |
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#define LP3972_BCCR_REG 0x89 |
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#define LP3972_II1RR_REG 0x8E |
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#define LP3972_II2RR_REG 0x8F |
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#define LP3972_SYS_CONTROL1_REG LP3972_SCR1_REG |
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/* System control register 1 initial value, |
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* bits 5, 6 and 7 are EPROM programmable */ |
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#define SYS_CONTROL1_INIT_VAL 0x02 |
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#define SYS_CONTROL1_INIT_MASK 0x1F |
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#define LP3972_VOL_CHANGE_REG LP3972_VCC1_REG |
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#define LP3972_VOL_CHANGE_FLAG_GO 0x01 |
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#define LP3972_VOL_CHANGE_FLAG_MASK 0x03 |
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/* LDO output enable mask */ |
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#define LP3972_OEN3_L1EN BIT(0) |
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#define LP3972_OVER2_LDO2_EN BIT(2) |
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#define LP3972_OVER2_LDO3_EN BIT(3) |
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#define LP3972_OVER2_LDO4_EN BIT(4) |
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#define LP3972_OVER1_S_EN BIT(2) |
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static const unsigned int ldo1_voltage_map[] = { |
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1700000, 1725000, 1750000, 1775000, 1800000, 1825000, 1850000, 1875000, |
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1900000, 1925000, 1950000, 1975000, 2000000, |
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}; |
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static const unsigned int ldo23_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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static const unsigned int ldo4_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 ldo5_voltage_map[] = { |
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0, 0, 0, 0, 0, 850000, 875000, 900000, |
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925000, 950000, 975000, 1000000, 1025000, 1050000, 1075000, 1100000, |
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1125000, 1150000, 1175000, 1200000, 1225000, 1250000, 1275000, 1300000, |
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1325000, 1350000, 1375000, 1400000, 1425000, 1450000, 1475000, 1500000, |
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}; |
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static const unsigned int buck1_voltage_map[] = { |
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725000, 750000, 775000, 800000, 825000, 850000, 875000, 900000, |
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925000, 950000, 975000, 1000000, 1025000, 1050000, 1075000, 1100000, |
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1125000, 1150000, 1175000, 1200000, 1225000, 1250000, 1275000, 1300000, |
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1325000, 1350000, 1375000, 1400000, 1425000, 1450000, 1475000, 1500000, |
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}; |
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static const unsigned int buck23_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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static const int ldo_output_enable_mask[] = { |
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LP3972_OEN3_L1EN, |
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LP3972_OVER2_LDO2_EN, |
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LP3972_OVER2_LDO3_EN, |
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LP3972_OVER2_LDO4_EN, |
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LP3972_OVER1_S_EN, |
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}; |
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static const int ldo_output_enable_addr[] = { |
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LP3972_OEN3_REG, |
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LP3972_OVER2_REG, |
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LP3972_OVER2_REG, |
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LP3972_OVER2_REG, |
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LP3972_OVER1_REG, |
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}; |
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static const int ldo_vol_ctl_addr[] = { |
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LP3972_MDTV1_REG, |
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LP3972_L2VCR_REG, |
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LP3972_L34VCR_REG, |
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LP3972_L34VCR_REG, |
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LP3972_SDTV1_REG, |
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}; |
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static const int buck_vol_enable_addr[] = { |
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LP3972_OVER1_REG, |
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LP3972_OEN3_REG, |
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LP3972_OEN3_REG, |
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}; |
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static const int buck_base_addr[] = { |
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LP3972_ADTV1_REG, |
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LP3972_B2TV_REG, |
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LP3972_B3TV_REG, |
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}; |
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#define LP3972_LDO_OUTPUT_ENABLE_MASK(x) (ldo_output_enable_mask[x]) |
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#define LP3972_LDO_OUTPUT_ENABLE_REG(x) (ldo_output_enable_addr[x]) |
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/* LDO voltage control registers shift: |
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LP3972_LDO1 -> 0, LP3972_LDO2 -> 4 |
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LP3972_LDO3 -> 0, LP3972_LDO4 -> 4 |
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LP3972_LDO5 -> 0 |
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*/ |
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#define LP3972_LDO_VOL_CONTR_SHIFT(x) (((x) & 1) << 2) |
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#define LP3972_LDO_VOL_CONTR_REG(x) (ldo_vol_ctl_addr[x]) |
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#define LP3972_LDO_VOL_CHANGE_SHIFT(x) ((x) ? 4 : 6) |
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#define LP3972_LDO_VOL_MASK(x) (((x) % 4) ? 0x0f : 0x1f) |
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#define LP3972_LDO_VOL_MIN_IDX(x) (((x) == 4) ? 0x05 : 0x00) |
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#define LP3972_LDO_VOL_MAX_IDX(x) ((x) ? (((x) == 4) ? 0x1f : 0x0f) : 0x0c) |
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#define LP3972_BUCK_VOL_ENABLE_REG(x) (buck_vol_enable_addr[x]) |
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#define LP3972_BUCK_VOL1_REG(x) (buck_base_addr[x]) |
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#define LP3972_BUCK_VOL_MASK 0x1f |
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static int lp3972_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 lp3972_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 lp3972_reg_read(struct lp3972 *lp3972, u8 reg) |
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{ |
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u16 val = 0; |
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mutex_lock(&lp3972->io_lock); |
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lp3972_i2c_read(lp3972->i2c, reg, 1, &val); |
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dev_dbg(lp3972->dev, "reg read 0x%02x -> 0x%02x\n", (int)reg, |
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(unsigned)val & 0xff); |
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mutex_unlock(&lp3972->io_lock); |
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return val & 0xff; |
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} |
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static int lp3972_set_bits(struct lp3972 *lp3972, 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(&lp3972->io_lock); |
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ret = lp3972_i2c_read(lp3972->i2c, reg, 1, &tmp); |
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if (ret == 0) { |
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tmp = (tmp & ~mask) | val; |
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ret = lp3972_i2c_write(lp3972->i2c, reg, 1, &tmp); |
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dev_dbg(lp3972->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(&lp3972->io_lock); |
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return ret; |
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} |
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static int lp3972_ldo_is_enabled(struct regulator_dev *dev) |
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{ |
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struct lp3972 *lp3972 = rdev_get_drvdata(dev); |
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int ldo = rdev_get_id(dev) - LP3972_LDO1; |
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u16 mask = LP3972_LDO_OUTPUT_ENABLE_MASK(ldo); |
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u16 val; |
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val = lp3972_reg_read(lp3972, LP3972_LDO_OUTPUT_ENABLE_REG(ldo)); |
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return !!(val & mask); |
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} |
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static int lp3972_ldo_enable(struct regulator_dev *dev) |
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{ |
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struct lp3972 *lp3972 = rdev_get_drvdata(dev); |
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int ldo = rdev_get_id(dev) - LP3972_LDO1; |
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u16 mask = LP3972_LDO_OUTPUT_ENABLE_MASK(ldo); |
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return lp3972_set_bits(lp3972, LP3972_LDO_OUTPUT_ENABLE_REG(ldo), |
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mask, mask); |
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} |
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static int lp3972_ldo_disable(struct regulator_dev *dev) |
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{ |
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struct lp3972 *lp3972 = rdev_get_drvdata(dev); |
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int ldo = rdev_get_id(dev) - LP3972_LDO1; |
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u16 mask = LP3972_LDO_OUTPUT_ENABLE_MASK(ldo); |
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return lp3972_set_bits(lp3972, LP3972_LDO_OUTPUT_ENABLE_REG(ldo), |
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mask, 0); |
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} |
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static int lp3972_ldo_get_voltage_sel(struct regulator_dev *dev) |
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{ |
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struct lp3972 *lp3972 = rdev_get_drvdata(dev); |
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int ldo = rdev_get_id(dev) - LP3972_LDO1; |
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u16 mask = LP3972_LDO_VOL_MASK(ldo); |
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u16 val, reg; |
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reg = lp3972_reg_read(lp3972, LP3972_LDO_VOL_CONTR_REG(ldo)); |
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val = (reg >> LP3972_LDO_VOL_CONTR_SHIFT(ldo)) & mask; |
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return val; |
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} |
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static int lp3972_ldo_set_voltage_sel(struct regulator_dev *dev, |
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unsigned int selector) |
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{ |
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struct lp3972 *lp3972 = rdev_get_drvdata(dev); |
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int ldo = rdev_get_id(dev) - LP3972_LDO1; |
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int shift, ret; |
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shift = LP3972_LDO_VOL_CONTR_SHIFT(ldo); |
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ret = lp3972_set_bits(lp3972, LP3972_LDO_VOL_CONTR_REG(ldo), |
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LP3972_LDO_VOL_MASK(ldo) << shift, selector << shift); |
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if (ret) |
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return ret; |
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/* |
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* LDO1 and LDO5 support voltage control by either target voltage1 |
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* or target voltage2 register. |
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* We use target voltage1 register for LDO1 and LDO5 in this driver. |
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* We need to update voltage change control register(0x20) to enable |
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* LDO1 and LDO5 to change to their programmed target values. |
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*/ |
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switch (ldo) { |
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case LP3972_LDO1: |
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case LP3972_LDO5: |
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shift = LP3972_LDO_VOL_CHANGE_SHIFT(ldo); |
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ret = lp3972_set_bits(lp3972, LP3972_VOL_CHANGE_REG, |
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LP3972_VOL_CHANGE_FLAG_MASK << shift, |
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LP3972_VOL_CHANGE_FLAG_GO << shift); |
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if (ret) |
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return ret; |
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ret = lp3972_set_bits(lp3972, LP3972_VOL_CHANGE_REG, |
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LP3972_VOL_CHANGE_FLAG_MASK << shift, 0); |
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break; |
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} |
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return ret; |
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} |
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static const struct regulator_ops lp3972_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 = lp3972_ldo_is_enabled, |
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.enable = lp3972_ldo_enable, |
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.disable = lp3972_ldo_disable, |
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.get_voltage_sel = lp3972_ldo_get_voltage_sel, |
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.set_voltage_sel = lp3972_ldo_set_voltage_sel, |
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}; |
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static int lp3972_dcdc_is_enabled(struct regulator_dev *dev) |
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{ |
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struct lp3972 *lp3972 = rdev_get_drvdata(dev); |
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int buck = rdev_get_id(dev) - LP3972_DCDC1; |
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u16 mask = 1 << (buck * 2); |
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u16 val; |
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val = lp3972_reg_read(lp3972, LP3972_BUCK_VOL_ENABLE_REG(buck)); |
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return !!(val & mask); |
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} |
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static int lp3972_dcdc_enable(struct regulator_dev *dev) |
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{ |
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struct lp3972 *lp3972 = rdev_get_drvdata(dev); |
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int buck = rdev_get_id(dev) - LP3972_DCDC1; |
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u16 mask = 1 << (buck * 2); |
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u16 val; |
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val = lp3972_set_bits(lp3972, LP3972_BUCK_VOL_ENABLE_REG(buck), |
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mask, mask); |
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return val; |
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} |
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static int lp3972_dcdc_disable(struct regulator_dev *dev) |
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{ |
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struct lp3972 *lp3972 = rdev_get_drvdata(dev); |
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int buck = rdev_get_id(dev) - LP3972_DCDC1; |
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u16 mask = 1 << (buck * 2); |
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u16 val; |
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val = lp3972_set_bits(lp3972, LP3972_BUCK_VOL_ENABLE_REG(buck), |
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mask, 0); |
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return val; |
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} |
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static int lp3972_dcdc_get_voltage_sel(struct regulator_dev *dev) |
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{ |
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struct lp3972 *lp3972 = rdev_get_drvdata(dev); |
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int buck = rdev_get_id(dev) - LP3972_DCDC1; |
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u16 reg; |
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reg = lp3972_reg_read(lp3972, LP3972_BUCK_VOL1_REG(buck)); |
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reg &= LP3972_BUCK_VOL_MASK; |
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return reg; |
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} |
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static int lp3972_dcdc_set_voltage_sel(struct regulator_dev *dev, |
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unsigned int selector) |
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{ |
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struct lp3972 *lp3972 = rdev_get_drvdata(dev); |
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int buck = rdev_get_id(dev) - LP3972_DCDC1; |
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int ret; |
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ret = lp3972_set_bits(lp3972, LP3972_BUCK_VOL1_REG(buck), |
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LP3972_BUCK_VOL_MASK, selector); |
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if (ret) |
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return ret; |
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if (buck != 0) |
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return ret; |
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ret = lp3972_set_bits(lp3972, LP3972_VOL_CHANGE_REG, |
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LP3972_VOL_CHANGE_FLAG_MASK, LP3972_VOL_CHANGE_FLAG_GO); |
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if (ret) |
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return ret; |
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return lp3972_set_bits(lp3972, LP3972_VOL_CHANGE_REG, |
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LP3972_VOL_CHANGE_FLAG_MASK, 0); |
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} |
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static const struct regulator_ops lp3972_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 = lp3972_dcdc_is_enabled, |
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.enable = lp3972_dcdc_enable, |
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.disable = lp3972_dcdc_disable, |
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.get_voltage_sel = lp3972_dcdc_get_voltage_sel, |
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.set_voltage_sel = lp3972_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 = LP3972_LDO1, |
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.ops = &lp3972_ldo_ops, |
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.n_voltages = ARRAY_SIZE(ldo1_voltage_map), |
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.volt_table = ldo1_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 = LP3972_LDO2, |
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.ops = &lp3972_ldo_ops, |
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.n_voltages = ARRAY_SIZE(ldo23_voltage_map), |
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.volt_table = ldo23_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 = LP3972_LDO3, |
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.ops = &lp3972_ldo_ops, |
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.n_voltages = ARRAY_SIZE(ldo23_voltage_map), |
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.volt_table = ldo23_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 = LP3972_LDO4, |
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.ops = &lp3972_ldo_ops, |
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.n_voltages = ARRAY_SIZE(ldo4_voltage_map), |
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.volt_table = ldo4_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 = LP3972_LDO5, |
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.ops = &lp3972_ldo_ops, |
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.n_voltages = ARRAY_SIZE(ldo5_voltage_map), |
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.volt_table = ldo5_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 = LP3972_DCDC1, |
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.ops = &lp3972_dcdc_ops, |
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.n_voltages = ARRAY_SIZE(buck1_voltage_map), |
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.volt_table = buck1_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 = LP3972_DCDC2, |
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.ops = &lp3972_dcdc_ops, |
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.n_voltages = ARRAY_SIZE(buck23_voltage_map), |
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.volt_table = buck23_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 = LP3972_DCDC3, |
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.ops = &lp3972_dcdc_ops, |
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.n_voltages = ARRAY_SIZE(buck23_voltage_map), |
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.volt_table = buck23_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 setup_regulators(struct lp3972 *lp3972, |
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struct lp3972_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 lp3972_regulator_subdev *reg = &pdata->regulators[i]; |
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struct regulator_config config = { }; |
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struct regulator_dev *rdev; |
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config.dev = lp3972->dev; |
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config.init_data = reg->initdata; |
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config.driver_data = lp3972; |
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rdev = devm_regulator_register(lp3972->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(lp3972->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 lp3972_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 lp3972 *lp3972; |
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struct lp3972_platform_data *pdata = dev_get_platdata(&i2c->dev); |
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int ret; |
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u16 val; |
|
|
|
if (!pdata) { |
|
dev_dbg(&i2c->dev, "No platform init data supplied\n"); |
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return -ENODEV; |
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} |
|
|
|
lp3972 = devm_kzalloc(&i2c->dev, sizeof(struct lp3972), GFP_KERNEL); |
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if (!lp3972) |
|
return -ENOMEM; |
|
|
|
lp3972->i2c = i2c; |
|
lp3972->dev = &i2c->dev; |
|
|
|
mutex_init(&lp3972->io_lock); |
|
|
|
/* Detect LP3972 */ |
|
ret = lp3972_i2c_read(i2c, LP3972_SYS_CONTROL1_REG, 1, &val); |
|
if (ret == 0 && |
|
(val & SYS_CONTROL1_INIT_MASK) != SYS_CONTROL1_INIT_VAL) { |
|
ret = -ENODEV; |
|
dev_err(&i2c->dev, "chip reported: val = 0x%x\n", val); |
|
} |
|
if (ret < 0) { |
|
dev_err(&i2c->dev, "failed to detect device. ret = %d\n", ret); |
|
return ret; |
|
} |
|
|
|
ret = setup_regulators(lp3972, pdata); |
|
if (ret < 0) |
|
return ret; |
|
|
|
i2c_set_clientdata(i2c, lp3972); |
|
return 0; |
|
} |
|
|
|
static const struct i2c_device_id lp3972_i2c_id[] = { |
|
{ "lp3972", 0 }, |
|
{ } |
|
}; |
|
MODULE_DEVICE_TABLE(i2c, lp3972_i2c_id); |
|
|
|
static struct i2c_driver lp3972_i2c_driver = { |
|
.driver = { |
|
.name = "lp3972", |
|
}, |
|
.probe = lp3972_i2c_probe, |
|
.id_table = lp3972_i2c_id, |
|
}; |
|
|
|
static int __init lp3972_module_init(void) |
|
{ |
|
return i2c_add_driver(&lp3972_i2c_driver); |
|
} |
|
subsys_initcall(lp3972_module_init); |
|
|
|
static void __exit lp3972_module_exit(void) |
|
{ |
|
i2c_del_driver(&lp3972_i2c_driver); |
|
} |
|
module_exit(lp3972_module_exit); |
|
|
|
MODULE_LICENSE("GPL"); |
|
MODULE_AUTHOR("Axel Lin <[email protected]>"); |
|
MODULE_DESCRIPTION("LP3972 PMIC driver");
|
|
|