diff options
Diffstat (limited to 'drivers/regulator/lp3972.c')
| -rw-r--r-- | drivers/regulator/lp3972.c | 568 |
1 files changed, 568 insertions, 0 deletions
diff --git a/drivers/regulator/lp3972.c b/drivers/regulator/lp3972.c new file mode 100644 index 000000000..2d276bbee --- /dev/null +++ b/drivers/regulator/lp3972.c @@ -0,0 +1,568 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * Regulator driver for National Semiconductors LP3972 PMIC chip + * + * Based on lp3971.c + */ + +#include <linux/bug.h> +#include <linux/err.h> +#include <linux/i2c.h> +#include <linux/module.h> +#include <linux/kernel.h> +#include <linux/regulator/driver.h> +#include <linux/regulator/lp3972.h> +#include <linux/slab.h> + +struct lp3972 { + struct device *dev; + struct mutex io_lock; + struct i2c_client *i2c; +}; + +/* LP3972 Control Registers */ +#define LP3972_SCR_REG 0x07 +#define LP3972_OVER1_REG 0x10 +#define LP3972_OVSR1_REG 0x11 +#define LP3972_OVER2_REG 0x12 +#define LP3972_OVSR2_REG 0x13 +#define LP3972_VCC1_REG 0x20 +#define LP3972_ADTV1_REG 0x23 +#define LP3972_ADTV2_REG 0x24 +#define LP3972_AVRC_REG 0x25 +#define LP3972_CDTC1_REG 0x26 +#define LP3972_CDTC2_REG 0x27 +#define LP3972_SDTV1_REG 0x29 +#define LP3972_SDTV2_REG 0x2A +#define LP3972_MDTV1_REG 0x32 +#define LP3972_MDTV2_REG 0x33 +#define LP3972_L2VCR_REG 0x39 +#define LP3972_L34VCR_REG 0x3A +#define LP3972_SCR1_REG 0x80 +#define LP3972_SCR2_REG 0x81 +#define LP3972_OEN3_REG 0x82 +#define LP3972_OSR3_REG 0x83 +#define LP3972_LOER4_REG 0x84 +#define LP3972_B2TV_REG 0x85 +#define LP3972_B3TV_REG 0x86 +#define LP3972_B32RC_REG 0x87 +#define LP3972_ISRA_REG 0x88 +#define LP3972_BCCR_REG 0x89 +#define LP3972_II1RR_REG 0x8E +#define LP3972_II2RR_REG 0x8F + +#define LP3972_SYS_CONTROL1_REG LP3972_SCR1_REG +/* System control register 1 initial value, + * bits 5, 6 and 7 are EPROM programmable */ +#define SYS_CONTROL1_INIT_VAL 0x02 +#define SYS_CONTROL1_INIT_MASK 0x1F + +#define LP3972_VOL_CHANGE_REG LP3972_VCC1_REG +#define LP3972_VOL_CHANGE_FLAG_GO 0x01 +#define LP3972_VOL_CHANGE_FLAG_MASK 0x03 + +/* LDO output enable mask */ +#define LP3972_OEN3_L1EN BIT(0) +#define LP3972_OVER2_LDO2_EN BIT(2) +#define LP3972_OVER2_LDO3_EN BIT(3) +#define LP3972_OVER2_LDO4_EN BIT(4) +#define LP3972_OVER1_S_EN BIT(2) + +static const unsigned int ldo1_voltage_map[] = { + 1700000, 1725000, 1750000, 1775000, 1800000, 1825000, 1850000, 1875000, + 1900000, 1925000, 1950000, 1975000, 2000000, +}; + +static const unsigned int ldo23_voltage_map[] = { + 1800000, 1900000, 2000000, 2100000, 2200000, 2300000, 2400000, 2500000, + 2600000, 2700000, 2800000, 2900000, 3000000, 3100000, 3200000, 3300000, +}; + +static const unsigned int ldo4_voltage_map[] = { + 1000000, 1050000, 1100000, 1150000, 1200000, 1250000, 1300000, 1350000, + 1400000, 1500000, 1800000, 1900000, 2500000, 2800000, 3000000, 3300000, +}; + +static const unsigned int ldo5_voltage_map[] = { + 0, 0, 0, 0, 0, 850000, 875000, 900000, + 925000, 950000, 975000, 1000000, 1025000, 1050000, 1075000, 1100000, + 1125000, 1150000, 1175000, 1200000, 1225000, 1250000, 1275000, 1300000, + 1325000, 1350000, 1375000, 1400000, 1425000, 1450000, 1475000, 1500000, +}; + +static const unsigned int buck1_voltage_map[] = { + 725000, 750000, 775000, 800000, 825000, 850000, 875000, 900000, + 925000, 950000, 975000, 1000000, 1025000, 1050000, 1075000, 1100000, + 1125000, 1150000, 1175000, 1200000, 1225000, 1250000, 1275000, 1300000, + 1325000, 1350000, 1375000, 1400000, 1425000, 1450000, 1475000, 1500000, +}; + +static const unsigned int buck23_voltage_map[] = { + 0, 800000, 850000, 900000, 950000, 1000000, 1050000, 1100000, + 1150000, 1200000, 1250000, 1300000, 1350000, 1400000, 1450000, 1500000, + 1550000, 1600000, 1650000, 1700000, 1800000, 1900000, 2500000, 2800000, + 3000000, 3300000, +}; + +static const int ldo_output_enable_mask[] = { + LP3972_OEN3_L1EN, + LP3972_OVER2_LDO2_EN, + LP3972_OVER2_LDO3_EN, + LP3972_OVER2_LDO4_EN, + LP3972_OVER1_S_EN, +}; + +static const int ldo_output_enable_addr[] = { + LP3972_OEN3_REG, + LP3972_OVER2_REG, + LP3972_OVER2_REG, + LP3972_OVER2_REG, + LP3972_OVER1_REG, +}; + +static const int ldo_vol_ctl_addr[] = { + LP3972_MDTV1_REG, + LP3972_L2VCR_REG, + LP3972_L34VCR_REG, + LP3972_L34VCR_REG, + LP3972_SDTV1_REG, +}; + +static const int buck_vol_enable_addr[] = { + LP3972_OVER1_REG, + LP3972_OEN3_REG, + LP3972_OEN3_REG, +}; + +static const int buck_base_addr[] = { + LP3972_ADTV1_REG, + LP3972_B2TV_REG, + LP3972_B3TV_REG, +}; + +#define LP3972_LDO_OUTPUT_ENABLE_MASK(x) (ldo_output_enable_mask[x]) +#define LP3972_LDO_OUTPUT_ENABLE_REG(x) (ldo_output_enable_addr[x]) + +/* LDO voltage control registers shift: + LP3972_LDO1 -> 0, LP3972_LDO2 -> 4 + LP3972_LDO3 -> 0, LP3972_LDO4 -> 4 + LP3972_LDO5 -> 0 +*/ +#define LP3972_LDO_VOL_CONTR_SHIFT(x) (((x) & 1) << 2) +#define LP3972_LDO_VOL_CONTR_REG(x) (ldo_vol_ctl_addr[x]) +#define LP3972_LDO_VOL_CHANGE_SHIFT(x) ((x) ? 4 : 6) + +#define LP3972_LDO_VOL_MASK(x) (((x) % 4) ? 0x0f : 0x1f) +#define LP3972_LDO_VOL_MIN_IDX(x) (((x) == 4) ? 0x05 : 0x00) +#define LP3972_LDO_VOL_MAX_IDX(x) ((x) ? (((x) == 4) ? 0x1f : 0x0f) : 0x0c) + +#define LP3972_BUCK_VOL_ENABLE_REG(x) (buck_vol_enable_addr[x]) +#define LP3972_BUCK_VOL1_REG(x) (buck_base_addr[x]) +#define LP3972_BUCK_VOL_MASK 0x1f + +static int lp3972_i2c_read(struct i2c_client *i2c, char reg, int count, + u16 *dest) +{ + int ret; + + if (count != 1) + return -EIO; + ret = i2c_smbus_read_byte_data(i2c, reg); + if (ret < 0) + return ret; + + *dest = ret; + return 0; +} + +static int lp3972_i2c_write(struct i2c_client *i2c, char reg, int count, + const u16 *src) +{ + if (count != 1) + return -EIO; + return i2c_smbus_write_byte_data(i2c, reg, *src); +} + +static u8 lp3972_reg_read(struct lp3972 *lp3972, u8 reg) +{ + u16 val = 0; + + mutex_lock(&lp3972->io_lock); + + lp3972_i2c_read(lp3972->i2c, reg, 1, &val); + + dev_dbg(lp3972->dev, "reg read 0x%02x -> 0x%02x\n", (int)reg, + (unsigned)val & 0xff); + + mutex_unlock(&lp3972->io_lock); + + return val & 0xff; +} + +static int lp3972_set_bits(struct lp3972 *lp3972, u8 reg, u16 mask, u16 val) +{ + u16 tmp; + int ret; + + mutex_lock(&lp3972->io_lock); + + ret = lp3972_i2c_read(lp3972->i2c, reg, 1, &tmp); + if (ret == 0) { + tmp = (tmp & ~mask) | val; + ret = lp3972_i2c_write(lp3972->i2c, reg, 1, &tmp); + dev_dbg(lp3972->dev, "reg write 0x%02x -> 0x%02x\n", (int)reg, + (unsigned)val & 0xff); + } + mutex_unlock(&lp3972->io_lock); + + return ret; +} + +static int lp3972_ldo_is_enabled(struct regulator_dev *dev) +{ + struct lp3972 *lp3972 = rdev_get_drvdata(dev); + int ldo = rdev_get_id(dev) - LP3972_LDO1; + u16 mask = LP3972_LDO_OUTPUT_ENABLE_MASK(ldo); + u16 val; + + val = lp3972_reg_read(lp3972, LP3972_LDO_OUTPUT_ENABLE_REG(ldo)); + return !!(val & mask); +} + +static int lp3972_ldo_enable(struct regulator_dev *dev) +{ + struct lp3972 *lp3972 = rdev_get_drvdata(dev); + int ldo = rdev_get_id(dev) - LP3972_LDO1; + u16 mask = LP3972_LDO_OUTPUT_ENABLE_MASK(ldo); + + return lp3972_set_bits(lp3972, LP3972_LDO_OUTPUT_ENABLE_REG(ldo), + mask, mask); +} + +static int lp3972_ldo_disable(struct regulator_dev *dev) +{ + struct lp3972 *lp3972 = rdev_get_drvdata(dev); + int ldo = rdev_get_id(dev) - LP3972_LDO1; + u16 mask = LP3972_LDO_OUTPUT_ENABLE_MASK(ldo); + + return lp3972_set_bits(lp3972, LP3972_LDO_OUTPUT_ENABLE_REG(ldo), + mask, 0); +} + +static int lp3972_ldo_get_voltage_sel(struct regulator_dev *dev) +{ + struct lp3972 *lp3972 = rdev_get_drvdata(dev); + int ldo = rdev_get_id(dev) - LP3972_LDO1; + u16 mask = LP3972_LDO_VOL_MASK(ldo); + u16 val, reg; + + reg = lp3972_reg_read(lp3972, LP3972_LDO_VOL_CONTR_REG(ldo)); + val = (reg >> LP3972_LDO_VOL_CONTR_SHIFT(ldo)) & mask; + + return val; +} + +static int lp3972_ldo_set_voltage_sel(struct regulator_dev *dev, + unsigned int selector) +{ + struct lp3972 *lp3972 = rdev_get_drvdata(dev); + int ldo = rdev_get_id(dev) - LP3972_LDO1; + int shift, ret; + + shift = LP3972_LDO_VOL_CONTR_SHIFT(ldo); + ret = lp3972_set_bits(lp3972, LP3972_LDO_VOL_CONTR_REG(ldo), + LP3972_LDO_VOL_MASK(ldo) << shift, selector << shift); + + if (ret) + return ret; + + /* + * LDO1 and LDO5 support voltage control by either target voltage1 + * or target voltage2 register. + * We use target voltage1 register for LDO1 and LDO5 in this driver. + * We need to update voltage change control register(0x20) to enable + * LDO1 and LDO5 to change to their programmed target values. + */ + switch (ldo) { + case LP3972_LDO1: + case LP3972_LDO5: + shift = LP3972_LDO_VOL_CHANGE_SHIFT(ldo); + ret = lp3972_set_bits(lp3972, LP3972_VOL_CHANGE_REG, + LP3972_VOL_CHANGE_FLAG_MASK << shift, + LP3972_VOL_CHANGE_FLAG_GO << shift); + if (ret) + return ret; + + ret = lp3972_set_bits(lp3972, LP3972_VOL_CHANGE_REG, + LP3972_VOL_CHANGE_FLAG_MASK << shift, 0); + break; + } + + return ret; +} + +static const struct regulator_ops lp3972_ldo_ops = { + .list_voltage = regulator_list_voltage_table, + .map_voltage = regulator_map_voltage_ascend, + .is_enabled = lp3972_ldo_is_enabled, + .enable = lp3972_ldo_enable, + .disable = lp3972_ldo_disable, + .get_voltage_sel = lp3972_ldo_get_voltage_sel, + .set_voltage_sel = lp3972_ldo_set_voltage_sel, +}; + +static int lp3972_dcdc_is_enabled(struct regulator_dev *dev) +{ + struct lp3972 *lp3972 = rdev_get_drvdata(dev); + int buck = rdev_get_id(dev) - LP3972_DCDC1; + u16 mask = 1 << (buck * 2); + u16 val; + + val = lp3972_reg_read(lp3972, LP3972_BUCK_VOL_ENABLE_REG(buck)); + return !!(val & mask); +} + +static int lp3972_dcdc_enable(struct regulator_dev *dev) +{ + struct lp3972 *lp3972 = rdev_get_drvdata(dev); + int buck = rdev_get_id(dev) - LP3972_DCDC1; + u16 mask = 1 << (buck * 2); + u16 val; + + val = lp3972_set_bits(lp3972, LP3972_BUCK_VOL_ENABLE_REG(buck), + mask, mask); + return val; +} + +static int lp3972_dcdc_disable(struct regulator_dev *dev) +{ + struct lp3972 *lp3972 = rdev_get_drvdata(dev); + int buck = rdev_get_id(dev) - LP3972_DCDC1; + u16 mask = 1 << (buck * 2); + u16 val; + + val = lp3972_set_bits(lp3972, LP3972_BUCK_VOL_ENABLE_REG(buck), + mask, 0); + return val; +} + +static int lp3972_dcdc_get_voltage_sel(struct regulator_dev *dev) +{ + struct lp3972 *lp3972 = rdev_get_drvdata(dev); + int buck = rdev_get_id(dev) - LP3972_DCDC1; + u16 reg; + + reg = lp3972_reg_read(lp3972, LP3972_BUCK_VOL1_REG(buck)); + reg &= LP3972_BUCK_VOL_MASK; + + return reg; +} + +static int lp3972_dcdc_set_voltage_sel(struct regulator_dev *dev, + unsigned int selector) +{ + struct lp3972 *lp3972 = rdev_get_drvdata(dev); + int buck = rdev_get_id(dev) - LP3972_DCDC1; + int ret; + + ret = lp3972_set_bits(lp3972, LP3972_BUCK_VOL1_REG(buck), + LP3972_BUCK_VOL_MASK, selector); + 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 const struct regulator_ops lp3972_dcdc_ops = { + .list_voltage = regulator_list_voltage_table, + .map_voltage = regulator_map_voltage_ascend, + .is_enabled = lp3972_dcdc_is_enabled, + .enable = lp3972_dcdc_enable, + .disable = lp3972_dcdc_disable, + .get_voltage_sel = lp3972_dcdc_get_voltage_sel, + .set_voltage_sel = lp3972_dcdc_set_voltage_sel, +}; + +static const struct regulator_desc regulators[] = { + { + .name = "LDO1", + .id = LP3972_LDO1, + .ops = &lp3972_ldo_ops, + .n_voltages = ARRAY_SIZE(ldo1_voltage_map), + .volt_table = 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), + .volt_table = 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), + .volt_table = 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), + .volt_table = 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), + .volt_table = 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), + .volt_table = 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), + .volt_table = 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), + .volt_table = buck23_voltage_map, + .type = REGULATOR_VOLTAGE, + .owner = THIS_MODULE, + }, +}; + +static int setup_regulators(struct lp3972 *lp3972, + struct lp3972_platform_data *pdata) +{ + int i, err; + + /* Instantiate the regulators */ + for (i = 0; i < pdata->num_regulators; i++) { + struct lp3972_regulator_subdev *reg = &pdata->regulators[i]; + struct regulator_config config = { }; + struct regulator_dev *rdev; + + config.dev = lp3972->dev; + config.init_data = reg->initdata; + config.driver_data = lp3972; + + rdev = devm_regulator_register(lp3972->dev, + ®ulators[reg->id], &config); + if (IS_ERR(rdev)) { + err = PTR_ERR(rdev); + dev_err(lp3972->dev, "regulator init failed: %d\n", + err); + return err; + } + } + + return 0; +} + +static int lp3972_i2c_probe(struct i2c_client *i2c, + const struct i2c_device_id *id) +{ + struct lp3972 *lp3972; + struct lp3972_platform_data *pdata = dev_get_platdata(&i2c->dev); + int ret; + u16 val; + + if (!pdata) { + dev_dbg(&i2c->dev, "No platform init data supplied\n"); + return -ENODEV; + } + + lp3972 = devm_kzalloc(&i2c->dev, 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; + 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 <axel.lin@gmail.com>"); +MODULE_DESCRIPTION("LP3972 PMIC driver"); |