Regulator: LP3972 PMIC regulator driver
This patch adds regulator drivers for National Semiconductors LP3972 PMIC. This LP3972 PMIC controller has 3 DC/DC voltage converters and 5 low drop-out (LDO) regulators. LP3972 PMIC controller uses I2C interface. Signed-off-by: Axel Lin <axel.lin@gmail.com> Acked-by: Mark Brown <broonie@opensource.wolfsonmicro.com> Signed-off-by: Liam Girdwood <lrg@slimlogic.co.uk>
This commit is contained in:
Axel Lin
Liam Girdwood
parent
202f4f53e5
commit
5976f0959d
@ -172,6 +172,13 @@ config REGULATOR_LP3971
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Say Y here to support the voltage regulators and convertors
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on National Semiconductors LP3971 PMIC
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config REGULATOR_LP3972
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tristate "National Semiconductors LP3972 PMIC regulator driver"
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depends on I2C
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help
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Say Y here to support the voltage regulators and convertors
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on National Semiconductors LP3972 PMIC
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config REGULATOR_PCAP
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tristate "PCAP2 regulator driver"
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depends on EZX_PCAP
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@ -12,6 +12,7 @@ obj-$(CONFIG_REGULATOR_AD5398) += ad5398.o
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obj-$(CONFIG_REGULATOR_BQ24022) += bq24022.o
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obj-$(CONFIG_REGULATOR_DUMMY) += dummy.o
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obj-$(CONFIG_REGULATOR_LP3971) += lp3971.o
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obj-$(CONFIG_REGULATOR_LP3972) += lp3972.o
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obj-$(CONFIG_REGULATOR_MAX1586) += max1586.o
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obj-$(CONFIG_REGULATOR_TWL4030) += twl-regulator.o
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obj-$(CONFIG_REGULATOR_MAX8649) += max8649.o
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649
drivers/regulator/lp3972.c
Normal file
649
drivers/regulator/lp3972.c
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@ -0,0 +1,649 @@
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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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* 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/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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int num_regulators;
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struct regulator_dev **rdev;
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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 int ldo1_voltage_map[] = {
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1700, 1725, 1750, 1775, 1800, 1825, 1850, 1875,
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1900, 1925, 1950, 1975, 2000,
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};
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static const int ldo23_voltage_map[] = {
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1800, 1900, 2000, 2100, 2200, 2300, 2400, 2500,
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2600, 2700, 2800, 2900, 3000, 3100, 3200, 3300,
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};
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static const int ldo4_voltage_map[] = {
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1000, 1050, 1100, 1150, 1200, 1250, 1300, 1350,
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1400, 1500, 1800, 1900, 2500, 2800, 3000, 3300,
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};
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static const int ldo5_voltage_map[] = {
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0, 0, 0, 0, 0, 850, 875, 900,
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925, 950, 975, 1000, 1025, 1050, 1075, 1100,
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1125, 1150, 1175, 1200, 1225, 1250, 1275, 1300,
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1325, 1350, 1375, 1400, 1425, 1450, 1475, 1500,
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};
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static const int buck1_voltage_map[] = {
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725, 750, 775, 800, 825, 850, 875, 900,
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925, 950, 975, 1000, 1025, 1050, 1075, 1100,
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1125, 1150, 1175, 1200, 1225, 1250, 1275, 1300,
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1325, 1350, 1375, 1400, 1425, 1450, 1475, 1500,
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};
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static const int buck23_voltage_map[] = {
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0, 800, 850, 900, 950, 1000, 1050, 1100,
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1150, 1200, 1250, 1300, 1350, 1400, 1450, 1500,
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1550, 1600, 1650, 1700, 1800, 1900, 2500, 2800,
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3000, 3300,
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};
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static const int *ldo_voltage_map[] = {
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ldo1_voltage_map,
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ldo23_voltage_map,
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ldo23_voltage_map,
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ldo4_voltage_map,
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ldo5_voltage_map,
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};
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static const int *buck_voltage_map[] = {
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buck1_voltage_map,
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buck23_voltage_map,
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buck23_voltage_map,
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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_VOL_VALUE_MAP(x) (ldo_voltage_map[x])
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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_VALUE_MAP(x) (buck_voltage_map[x])
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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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#define LP3972_BUCK_VOL_MIN_IDX(x) ((x) ? 0x01 : 0x00)
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#define LP3972_BUCK_VOL_MAX_IDX(x) ((x) ? 0x19 : 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 -EIO;
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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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tmp = (tmp & ~mask) | val;
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if (ret == 0) {
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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_list_voltage(struct regulator_dev *dev, unsigned index)
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{
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int ldo = rdev_get_id(dev) - LP3972_LDO1;
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return 1000 * LP3972_LDO_VOL_VALUE_MAP(ldo)[index];
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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(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 1000 * LP3972_LDO_VOL_VALUE_MAP(ldo)[val];
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}
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static int lp3972_ldo_set_voltage(struct regulator_dev *dev,
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int min_uV, int max_uV)
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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 min_vol = min_uV / 1000, max_vol = max_uV / 1000;
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const int *vol_map = LP3972_LDO_VOL_VALUE_MAP(ldo);
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u16 val;
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int shift, ret;
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if (min_vol < vol_map[LP3972_LDO_VOL_MIN_IDX(ldo)] ||
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min_vol > vol_map[LP3972_LDO_VOL_MAX_IDX(ldo)])
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return -EINVAL;
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for (val = LP3972_LDO_VOL_MIN_IDX(ldo);
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val <= LP3972_LDO_VOL_MAX_IDX(ldo); val++)
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if (vol_map[val] >= min_vol)
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break;
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if (val > LP3972_LDO_VOL_MAX_IDX(ldo) || vol_map[val] > max_vol)
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return -EINVAL;
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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, val << shift);
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if (ret)
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return ret;
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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 struct regulator_ops lp3972_ldo_ops = {
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.list_voltage = lp3972_ldo_list_voltage,
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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 = lp3972_ldo_get_voltage,
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.set_voltage = lp3972_ldo_set_voltage,
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};
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static int lp3972_dcdc_list_voltage(struct regulator_dev *dev, unsigned index)
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{
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int buck = rdev_get_id(dev) - LP3972_DCDC1;
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return 1000 * buck_voltage_map[buck][index];
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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;
|
||||
|
||||
val = lp3972_set_bits(lp3972, LP3972_BUCK_VOL_ENABLE_REG(buck),
|
||||
mask, 0);
|
||||
return val;
|
||||
}
|
||||
|
||||
static int lp3972_dcdc_get_voltage(struct regulator_dev *dev)
|
||||
{
|
||||
struct lp3972 *lp3972 = rdev_get_drvdata(dev);
|
||||
int buck = rdev_get_id(dev) - LP3972_DCDC1;
|
||||
u16 reg;
|
||||
int val;
|
||||
|
||||
reg = lp3972_reg_read(lp3972, LP3972_BUCK_VOL1_REG(buck));
|
||||
reg &= LP3972_BUCK_VOL_MASK;
|
||||
if (reg <= LP3972_BUCK_VOL_MAX_IDX(buck))
|
||||
val = 1000 * buck_voltage_map[buck][reg];
|
||||
else {
|
||||
val = 0;
|
||||
dev_warn(&dev->dev, "chip reported incorrect voltage value.\n");
|
||||
}
|
||||
|
||||
return val;
|
||||
}
|
||||
|
||||
static int lp3972_dcdc_set_voltage(struct regulator_dev *dev,
|
||||
int min_uV, int max_uV)
|
||||
{
|
||||
struct lp3972 *lp3972 = rdev_get_drvdata(dev);
|
||||
int buck = rdev_get_id(dev) - LP3972_DCDC1;
|
||||
int min_vol = min_uV / 1000, max_vol = max_uV / 1000;
|
||||
const int *vol_map = buck_voltage_map[buck];
|
||||
u16 val;
|
||||
int ret;
|
||||
|
||||
if (min_vol < vol_map[LP3972_BUCK_VOL_MIN_IDX(buck)] ||
|
||||
min_vol > vol_map[LP3972_BUCK_VOL_MAX_IDX(buck)])
|
||||
return -EINVAL;
|
||||
|
||||
for (val = LP3972_BUCK_VOL_MIN_IDX(buck);
|
||||
val <= LP3972_BUCK_VOL_MAX_IDX(buck); val++)
|
||||
if (vol_map[val] >= min_vol)
|
||||
break;
|
||||
|
||||
if (val > LP3972_BUCK_VOL_MAX_IDX(buck) ||
|
||||
vol_map[val] > max_vol)
|
||||
return -EINVAL;
|
||||
|
||||
ret = lp3972_set_bits(lp3972, LP3972_BUCK_VOL1_REG(buck),
|
||||
LP3972_BUCK_VOL_MASK, val);
|
||||
if (ret)
|
||||
return ret;
|
||||
|
||||
if (buck != 0)
|
||||
return ret;
|
||||
|
||||
ret = lp3972_set_bits(lp3972, LP3972_VOL_CHANGE_REG,
|
||||
LP3972_VOL_CHANGE_FLAG_MASK, LP3972_VOL_CHANGE_FLAG_GO);
|
||||
if (ret)
|
||||
return ret;
|
||||
|
||||
return lp3972_set_bits(lp3972, LP3972_VOL_CHANGE_REG,
|
||||
LP3972_VOL_CHANGE_FLAG_MASK, 0);
|
||||
}
|
||||
|
||||
static struct regulator_ops lp3972_dcdc_ops = {
|
||||
.list_voltage = lp3972_dcdc_list_voltage,
|
||||
.is_enabled = lp3972_dcdc_is_enabled,
|
||||
.enable = lp3972_dcdc_enable,
|
||||
.disable = lp3972_dcdc_disable,
|
||||
.get_voltage = lp3972_dcdc_get_voltage,
|
||||
.set_voltage = lp3972_dcdc_set_voltage,
|
||||
};
|
||||
|
||||
static struct regulator_desc regulators[] = {
|
||||
{
|
||||
.name = "LDO1",
|
||||
.id = LP3972_LDO1,
|
||||
.ops = &lp3972_ldo_ops,
|
||||
.n_voltages = ARRAY_SIZE(ldo1_voltage_map),
|
||||
.type = REGULATOR_VOLTAGE,
|
||||
.owner = THIS_MODULE,
|
||||
},
|
||||
{
|
||||
.name = "LDO2",
|
||||
.id = LP3972_LDO2,
|
||||
.ops = &lp3972_ldo_ops,
|
||||
.n_voltages = ARRAY_SIZE(ldo23_voltage_map),
|
||||
.type = REGULATOR_VOLTAGE,
|
||||
.owner = THIS_MODULE,
|
||||
},
|
||||
{
|
||||
.name = "LDO3",
|
||||
.id = LP3972_LDO3,
|
||||
.ops = &lp3972_ldo_ops,
|
||||
.n_voltages = ARRAY_SIZE(ldo23_voltage_map),
|
||||
.type = REGULATOR_VOLTAGE,
|
||||
.owner = THIS_MODULE,
|
||||
},
|
||||
{
|
||||
.name = "LDO4",
|
||||
.id = LP3972_LDO4,
|
||||
.ops = &lp3972_ldo_ops,
|
||||
.n_voltages = ARRAY_SIZE(ldo4_voltage_map),
|
||||
.type = REGULATOR_VOLTAGE,
|
||||
.owner = THIS_MODULE,
|
||||
},
|
||||
{
|
||||
.name = "LDO5",
|
||||
.id = LP3972_LDO5,
|
||||
.ops = &lp3972_ldo_ops,
|
||||
.n_voltages = ARRAY_SIZE(ldo5_voltage_map),
|
||||
.type = REGULATOR_VOLTAGE,
|
||||
.owner = THIS_MODULE,
|
||||
},
|
||||
{
|
||||
.name = "DCDC1",
|
||||
.id = LP3972_DCDC1,
|
||||
.ops = &lp3972_dcdc_ops,
|
||||
.n_voltages = ARRAY_SIZE(buck1_voltage_map),
|
||||
.type = REGULATOR_VOLTAGE,
|
||||
.owner = THIS_MODULE,
|
||||
},
|
||||
{
|
||||
.name = "DCDC2",
|
||||
.id = LP3972_DCDC2,
|
||||
.ops = &lp3972_dcdc_ops,
|
||||
.n_voltages = ARRAY_SIZE(buck23_voltage_map),
|
||||
.type = REGULATOR_VOLTAGE,
|
||||
.owner = THIS_MODULE,
|
||||
},
|
||||
{
|
||||
.name = "DCDC3",
|
||||
.id = LP3972_DCDC3,
|
||||
.ops = &lp3972_dcdc_ops,
|
||||
.n_voltages = ARRAY_SIZE(buck23_voltage_map),
|
||||
.type = REGULATOR_VOLTAGE,
|
||||
.owner = THIS_MODULE,
|
||||
},
|
||||
};
|
||||
|
||||
static int setup_regulators(struct lp3972 *lp3972,
|
||||
struct lp3972_platform_data *pdata)
|
||||
{
|
||||
int i, err;
|
||||
|
||||
lp3972->num_regulators = pdata->num_regulators;
|
||||
lp3972->rdev = kcalloc(pdata->num_regulators,
|
||||
sizeof(struct regulator_dev *), GFP_KERNEL);
|
||||
if (!lp3972->rdev) {
|
||||
err = -ENOMEM;
|
||||
goto err_nomem;
|
||||
}
|
||||
|
||||
/* Instantiate the regulators */
|
||||
for (i = 0; i < pdata->num_regulators; i++) {
|
||||
struct lp3972_regulator_subdev *reg = &pdata->regulators[i];
|
||||
lp3972->rdev[i] = regulator_register(®ulators[reg->id],
|
||||
lp3972->dev, reg->initdata, lp3972);
|
||||
|
||||
if (IS_ERR(lp3972->rdev[i])) {
|
||||
err = PTR_ERR(lp3972->rdev[i]);
|
||||
dev_err(lp3972->dev, "regulator init failed: %d\n",
|
||||
err);
|
||||
goto error;
|
||||
}
|
||||
}
|
||||
|
||||
return 0;
|
||||
error:
|
||||
while (--i >= 0)
|
||||
regulator_unregister(lp3972->rdev[i]);
|
||||
kfree(lp3972->rdev);
|
||||
lp3972->rdev = NULL;
|
||||
err_nomem:
|
||||
return err;
|
||||
}
|
||||
|
||||
static int __devinit lp3972_i2c_probe(struct i2c_client *i2c,
|
||||
const struct i2c_device_id *id)
|
||||
{
|
||||
struct lp3972 *lp3972;
|
||||
struct lp3972_platform_data *pdata = i2c->dev.platform_data;
|
||||
int ret;
|
||||
u16 val;
|
||||
|
||||
if (!pdata) {
|
||||
dev_dbg(&i2c->dev, "No platform init data supplied\n");
|
||||
return -ENODEV;
|
||||
}
|
||||
|
||||
lp3972 = kzalloc(sizeof(struct lp3972), GFP_KERNEL);
|
||||
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;
|
||||
if (ret < 0) {
|
||||
dev_err(&i2c->dev, "failed to detect device\n");
|
||||
goto err_detect;
|
||||
}
|
||||
|
||||
ret = setup_regulators(lp3972, pdata);
|
||||
if (ret < 0)
|
||||
goto err_detect;
|
||||
|
||||
i2c_set_clientdata(i2c, lp3972);
|
||||
return 0;
|
||||
|
||||
err_detect:
|
||||
kfree(lp3972);
|
||||
return ret;
|
||||
}
|
||||
|
||||
static int __devexit lp3972_i2c_remove(struct i2c_client *i2c)
|
||||
{
|
||||
struct lp3972 *lp3972 = i2c_get_clientdata(i2c);
|
||||
int i;
|
||||
|
||||
for (i = 0; i < lp3972->num_regulators; i++)
|
||||
regulator_unregister(lp3972->rdev[i]);
|
||||
kfree(lp3972->rdev);
|
||||
kfree(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",
|
||||
.owner = THIS_MODULE,
|
||||
},
|
||||
.probe = lp3972_i2c_probe,
|
||||
.remove = __devexit_p(lp3972_i2c_remove),
|
||||
.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 <axel.lin@gmail.com>");
|
||||
MODULE_DESCRIPTION("LP3972 PMIC driver");
|
||||
48
include/linux/regulator/lp3972.h
Normal file
48
include/linux/regulator/lp3972.h
Normal file
@ -0,0 +1,48 @@
|
||||
/*
|
||||
* National Semiconductors LP3972 PMIC chip client interface
|
||||
*
|
||||
* Based on lp3971.h
|
||||
*
|
||||
* This program is free software; you can redistribute it and/or modify
|
||||
* it under the terms of the GNU General Public License as published by
|
||||
* the Free Software Foundation; either version 2 of the License, or
|
||||
* (at your option) any later version.
|
||||
*
|
||||
* This program is distributed in the hope that it will be useful,
|
||||
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
||||
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
||||
* GNU General Public License for more details.
|
||||
*
|
||||
* You should have received a copy of the GNU General Public License
|
||||
* along with this program; if not, write to the Free Software
|
||||
* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
|
||||
*/
|
||||
|
||||
#ifndef __LINUX_REGULATOR_LP3972_H
|
||||
#define __LINUX_REGULATOR_LP3972_H
|
||||
|
||||
#include <linux/regulator/machine.h>
|
||||
|
||||
#define LP3972_LDO1 0
|
||||
#define LP3972_LDO2 1
|
||||
#define LP3972_LDO3 2
|
||||
#define LP3972_LDO4 3
|
||||
#define LP3972_LDO5 4
|
||||
|
||||
#define LP3972_DCDC1 5
|
||||
#define LP3972_DCDC2 6
|
||||
#define LP3972_DCDC3 7
|
||||
|
||||
#define LP3972_NUM_REGULATORS 8
|
||||
|
||||
struct lp3972_regulator_subdev {
|
||||
int id;
|
||||
struct regulator_init_data *initdata;
|
||||
};
|
||||
|
||||
struct lp3972_platform_data {
|
||||
int num_regulators;
|
||||
struct lp3972_regulator_subdev *regulators;
|
||||
};
|
||||
|
||||
#endif
|
||||
Loading…
Reference in New Issue
Block a user