// SPDX-License-Identifier: GPL-2.0-or-later /* * Hardware monitoring driver for MPS Multi-phase Digital VR Controllers(MP2993) */ #include #include #include #include "pmbus.h" #define MP2993_VOUT_OVUV_UINT 125 #define MP2993_VOUT_OVUV_DIV 64 #define MP2993_VIN_LIMIT_UINT 1 #define MP2993_VIN_LIMIT_DIV 8 #define MP2993_READ_VIN_UINT 1 #define MP2993_READ_VIN_DIV 32 #define MP2993_PAGE_NUM 2 #define MP2993_RAIL1_FUNC (PMBUS_HAVE_VIN | PMBUS_HAVE_VOUT | \ PMBUS_HAVE_IOUT | PMBUS_HAVE_POUT | \ PMBUS_HAVE_TEMP | PMBUS_HAVE_PIN | \ PMBUS_HAVE_IIN | \ PMBUS_HAVE_STATUS_VOUT | \ PMBUS_HAVE_STATUS_IOUT | \ PMBUS_HAVE_STATUS_TEMP | \ PMBUS_HAVE_STATUS_INPUT) #define MP2993_RAIL2_FUNC (PMBUS_HAVE_VOUT | PMBUS_HAVE_IOUT | \ PMBUS_HAVE_POUT | PMBUS_HAVE_TEMP | \ PMBUS_HAVE_STATUS_VOUT | \ PMBUS_HAVE_STATUS_IOUT | \ PMBUS_HAVE_STATUS_TEMP | \ PMBUS_HAVE_STATUS_INPUT) /* Converts a linear11 data exponent to a specified value */ static u16 mp2993_linear11_exponent_transfer(u16 word, u16 expect_exponent) { s16 exponent, mantissa, target_exponent; exponent = ((s16)word) >> 11; mantissa = ((s16)((word & 0x7ff) << 5)) >> 5; target_exponent = (s16)((expect_exponent & 0x1f) << 11) >> 11; if (exponent > target_exponent) mantissa = mantissa << (exponent - target_exponent); else mantissa = mantissa >> (target_exponent - exponent); return (mantissa & 0x7ff) | ((expect_exponent << 11) & 0xf800); } static int mp2993_set_vout_format(struct i2c_client *client, int page, int format) { int ret; ret = i2c_smbus_write_byte_data(client, PMBUS_PAGE, page); if (ret < 0) return ret; return i2c_smbus_write_byte_data(client, PMBUS_VOUT_MODE, format); } static int mp2993_identify(struct i2c_client *client, struct pmbus_driver_info *info) { int ret; /* Set vout to direct format for rail1. */ ret = mp2993_set_vout_format(client, 0, PB_VOUT_MODE_DIRECT); if (ret < 0) return ret; /* Set vout to direct format for rail2. */ return mp2993_set_vout_format(client, 1, PB_VOUT_MODE_DIRECT); } static int mp2993_read_word_data(struct i2c_client *client, int page, int phase, int reg) { int ret; switch (reg) { case PMBUS_VOUT_OV_FAULT_LIMIT: case PMBUS_VOUT_UV_FAULT_LIMIT: ret = pmbus_read_word_data(client, page, phase, reg); if (ret < 0) return ret; ret = DIV_ROUND_CLOSEST(ret * MP2993_VOUT_OVUV_UINT, MP2993_VOUT_OVUV_DIV); break; case PMBUS_OT_FAULT_LIMIT: case PMBUS_OT_WARN_LIMIT: /* * The MP2993 ot fault limit value and ot warn limit value * per rail are always the same, so only PMBUS_OT_FAULT_LIMIT * and PMBUS_OT_WARN_LIMIT register in page 0 are defined to * indicates the limit value. */ ret = pmbus_read_word_data(client, 0, phase, reg); break; case PMBUS_READ_VIN: /* The MP2993 vin scale is (1/32V)/Lsb */ ret = pmbus_read_word_data(client, page, phase, reg); if (ret < 0) return ret; ret = DIV_ROUND_CLOSEST((ret & GENMASK(9, 0)) * MP2993_READ_VIN_UINT, MP2993_READ_VIN_DIV); break; case PMBUS_VIN_OV_FAULT_LIMIT: case PMBUS_VIN_OV_WARN_LIMIT: case PMBUS_VIN_UV_WARN_LIMIT: case PMBUS_VIN_UV_FAULT_LIMIT: /* The MP2993 vin limit scale is (1/8V)/Lsb */ ret = pmbus_read_word_data(client, page, phase, reg); if (ret < 0) return ret; ret = DIV_ROUND_CLOSEST((ret & GENMASK(7, 0)) * MP2993_VIN_LIMIT_UINT, MP2993_VIN_LIMIT_DIV); break; case PMBUS_READ_IOUT: case PMBUS_READ_IIN: case PMBUS_IIN_OC_WARN_LIMIT: case PMBUS_IOUT_OC_FAULT_LIMIT: case PMBUS_IOUT_OC_WARN_LIMIT: case PMBUS_READ_VOUT: case PMBUS_READ_PIN: case PMBUS_READ_POUT: case PMBUS_READ_TEMPERATURE_1: ret = -ENODATA; break; default: ret = -EINVAL; break; } return ret; } static int mp2993_write_word_data(struct i2c_client *client, int page, int reg, u16 word) { int ret; switch (reg) { case PMBUS_VOUT_OV_FAULT_LIMIT: case PMBUS_VOUT_UV_FAULT_LIMIT: ret = DIV_ROUND_CLOSEST(word * MP2993_VOUT_OVUV_DIV, MP2993_VOUT_OVUV_UINT); ret = pmbus_write_word_data(client, 0, reg, ret); break; case PMBUS_OT_FAULT_LIMIT: case PMBUS_OT_WARN_LIMIT: /* * The MP2993 ot fault limit value and ot warn limit value * per rail are always the same, so only PMBUS_OT_FAULT_LIMIT * and PMBUS_OT_WARN_LIMIT register in page 0 are defined to * config the ot limit value. */ ret = pmbus_write_word_data(client, 0, reg, word); break; case PMBUS_VIN_OV_FAULT_LIMIT: case PMBUS_VIN_OV_WARN_LIMIT: case PMBUS_VIN_UV_WARN_LIMIT: case PMBUS_VIN_UV_FAULT_LIMIT: /* The MP2993 vin limit scale is (1/8V)/Lsb */ ret = pmbus_write_word_data(client, 0, reg, DIV_ROUND_CLOSEST(word * MP2993_VIN_LIMIT_DIV, MP2993_VIN_LIMIT_UINT)); break; case PMBUS_IIN_OC_WARN_LIMIT: /* * The PMBUS_IIN_OC_WARN_LIMIT of MP2993 is linear11 format, * and the exponent is a constant value(5'b00000)， so the * exponent of word parameter should be converted to 5'b00000. */ ret = pmbus_write_word_data(client, page, reg, mp2993_linear11_exponent_transfer(word, 0x00)); break; // case PMBUS_IOUT_OC_FAULT_LIMIT: case PMBUS_IOUT_OC_WARN_LIMIT: /* * The PMBUS_IOUT_OC_FAULT_LIMIT and PMBUS_IOUT_OC_WARN_LIMIT * of MP2993 can be regarded as linear11 format, and the * exponent is a 5'b00001 or 5'b00000. To ensure a larger * range of limit value, so the exponent of word parameter * should be converted to 5'b00001. */ ret = pmbus_write_word_data(client, page, reg, mp2993_linear11_exponent_transfer(word, 0x01)); break; default: ret = -EINVAL; break; } return ret; } static struct pmbus_driver_info mp2993_info = { .pages = MP2993_PAGE_NUM, .format[PSC_VOLTAGE_IN] = direct, .format[PSC_CURRENT_IN] = linear, .format[PSC_CURRENT_OUT] = linear, .format[PSC_TEMPERATURE] = direct, .format[PSC_POWER] = linear, .format[PSC_VOLTAGE_OUT] = direct, .m[PSC_VOLTAGE_OUT] = 1, .R[PSC_VOLTAGE_OUT] = 3, .b[PSC_VOLTAGE_OUT] = 0, .m[PSC_VOLTAGE_IN] = 1, .R[PSC_VOLTAGE_IN] = 0, .b[PSC_VOLTAGE_IN] = 0, .m[PSC_TEMPERATURE] = 1, .R[PSC_TEMPERATURE] = 0, .b[PSC_TEMPERATURE] = 0, .func[0] = MP2993_RAIL1_FUNC, .func[1] = MP2993_RAIL2_FUNC, .read_word_data = mp2993_read_word_data, .write_word_data = mp2993_write_word_data, .identify = mp2993_identify, }; static int mp2993_probe(struct i2c_client *client) { return pmbus_do_probe(client, &mp2993_info); } static const struct i2c_device_id mp2993_id[] = { {"mp2993", 0}, {} }; MODULE_DEVICE_TABLE(i2c, mp2993_id); static const struct of_device_id __maybe_unused mp2993_of_match[] = { {.compatible = "mps,mp2993"}, {} }; MODULE_DEVICE_TABLE(of, mp2993_of_match); static struct i2c_driver mp2993_driver = { .driver = { .name = "mp2993", .of_match_table = mp2993_of_match, }, .probe = mp2993_probe, .id_table = mp2993_id, }; module_i2c_driver(mp2993_driver); MODULE_AUTHOR("Noah Wang "); MODULE_DESCRIPTION("PMBus driver for MPS MP2993"); MODULE_LICENSE("GPL"); MODULE_IMPORT_NS(PMBUS);