diff options
Diffstat (limited to 'drivers/regulator')
| -rw-r--r-- | drivers/regulator/mp8859.c | 156 |
1 files changed, 156 insertions, 0 deletions
diff --git a/drivers/regulator/mp8859.c b/drivers/regulator/mp8859.c new file mode 100644 index 000000000000..e804a5267301 --- /dev/null +++ b/drivers/regulator/mp8859.c @@ -0,0 +1,156 @@ +// SPDX-License-Identifier: GPL-2.0 +// +// Copyright (c) 2019 five technologies GmbH +// Author: Markus Reichl <m.reichl@fivetechno.de> + +#include <linux/module.h> +#include <linux/i2c.h> +#include <linux/of.h> +#include <linux/regulator/driver.h> +#include <linux/regmap.h> + + +#define VOL_MIN_IDX 0x00 +#define VOL_MAX_IDX 0x7ff + +/* Register definitions */ +#define MP8859_VOUT_L_REG 0 //3 lo Bits +#define MP8859_VOUT_H_REG 1 //8 hi Bits +#define MP8859_VOUT_GO_REG 2 +#define MP8859_IOUT_LIM_REG 3 +#define MP8859_CTL1_REG 4 +#define MP8859_CTL2_REG 5 +#define MP8859_RESERVED1_REG 6 +#define MP8859_RESERVED2_REG 7 +#define MP8859_RESERVED3_REG 8 +#define MP8859_STATUS_REG 9 +#define MP8859_INTERRUPT_REG 0x0A +#define MP8859_MASK_REG 0x0B +#define MP8859_ID1_REG 0x0C +#define MP8859_MFR_ID_REG 0x27 +#define MP8859_DEV_ID_REG 0x28 +#define MP8859_IC_REV_REG 0x29 + +#define MP8859_MAX_REG 0x29 + +#define MP8859_GO_BIT 0x01 + + +static int mp8859_set_voltage_sel(struct regulator_dev *rdev, unsigned int sel) +{ + int ret; + + ret = regmap_write(rdev->regmap, MP8859_VOUT_L_REG, sel & 0x7); + + if (ret) + return ret; + ret = regmap_write(rdev->regmap, MP8859_VOUT_H_REG, sel >> 3); + + if (ret) + return ret; + ret = regmap_update_bits(rdev->regmap, MP8859_VOUT_GO_REG, + MP8859_GO_BIT, 1); + return ret; +} + +static int mp8859_get_voltage_sel(struct regulator_dev *rdev) +{ + unsigned int val_tmp; + unsigned int val; + int ret; + + ret = regmap_read(rdev->regmap, MP8859_VOUT_H_REG, &val_tmp); + + if (ret) + return ret; + val = val_tmp << 3; + + ret = regmap_read(rdev->regmap, MP8859_VOUT_L_REG, &val_tmp); + + if (ret) + return ret; + val |= val_tmp & 0x07; + return val; +} + +static const struct regulator_linear_range mp8859_dcdc_ranges[] = { + REGULATOR_LINEAR_RANGE(0, VOL_MIN_IDX, VOL_MAX_IDX, 10000), +}; + +static const struct regmap_config mp8859_regmap = { + .reg_bits = 8, + .val_bits = 8, + .max_register = MP8859_MAX_REG, + .cache_type = REGCACHE_RBTREE, +}; + +static const struct regulator_ops mp8859_ops = { + .set_voltage_sel = mp8859_set_voltage_sel, + .get_voltage_sel = mp8859_get_voltage_sel, + .list_voltage = regulator_list_voltage_linear_range, +}; + +static const struct regulator_desc mp8859_regulators[] = { + { + .id = 0, + .type = REGULATOR_VOLTAGE, + .name = "mp8859_dcdc", + .of_match = of_match_ptr("mp8859_dcdc"), + .n_voltages = VOL_MAX_IDX + 1, + .linear_ranges = mp8859_dcdc_ranges, + .n_linear_ranges = 1, + .ops = &mp8859_ops, + .owner = THIS_MODULE, + }, +}; + +static int mp8859_i2c_probe(struct i2c_client *i2c) +{ + int ret; + struct regulator_config config = {.dev = &i2c->dev}; + struct regmap *regmap = devm_regmap_init_i2c(i2c, &mp8859_regmap); + struct regulator_dev *rdev; + + if (IS_ERR(regmap)) { + ret = PTR_ERR(regmap); + dev_err(&i2c->dev, "regmap init failed: %d\n", ret); + return ret; + } + rdev = devm_regulator_register(&i2c->dev, &mp8859_regulators[0], + &config); + + if (IS_ERR(rdev)) { + ret = PTR_ERR(rdev); + dev_err(&i2c->dev, "failed to register %s: %d\n", + mp8859_regulators[0].name, ret); + return ret; + } + return 0; +} + +static const struct of_device_id mp8859_dt_id[] = { + {.compatible = "mps,mp8859"}, + {}, +}; +MODULE_DEVICE_TABLE(of, mp8859_dt_id); + +static const struct i2c_device_id mp8859_i2c_id[] = { + { "mp8859", }, + { }, +}; +MODULE_DEVICE_TABLE(i2c, mp8859_i2c_id); + +static struct i2c_driver mp8859_regulator_driver = { + .driver = { + .name = "mp8859", + .of_match_table = of_match_ptr(mp8859_dt_id), + }, + .probe_new = mp8859_i2c_probe, + .id_table = mp8859_i2c_id, +}; + +module_i2c_driver(mp8859_regulator_driver); + +MODULE_DESCRIPTION("Monolithic Power Systems MP8859 voltage regulator driver"); +MODULE_AUTHOR("Markus Reichl <m.reichl@fivetechno.de>"); +MODULE_LICENSE("GPL v2"); |