315 lines
8.5 KiB
C
315 lines
8.5 KiB
C
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// SPDX-License-Identifier: GPL-2.0
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/*
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* Hardware monitoring driver for Maxim MAX16601
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*
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* Implementation notes:
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*
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* Ths chip supports two rails, VCORE and VSA. Telemetry information for the
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* two rails is reported in two subsequent I2C addresses. The driver
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* instantiates a dummy I2C client at the second I2C address to report
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* information for the VSA rail in a single instance of the driver.
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* Telemetry for the VSA rail is reported to the PMBus core in PMBus page 2.
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*
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* The chip reports input current using two separate methods. The input current
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* reported with the standard READ_IIN command is derived from the output
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* current. The first method is reported to the PMBus core with PMBus page 0,
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* the second method is reported with PMBus page 1.
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*
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* The chip supports reading per-phase temperatures and per-phase input/output
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* currents for VCORE. Telemetry is reported in vendor specific registers.
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* The driver translates the vendor specific register values to PMBus standard
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* register values and reports per-phase information in PMBus page 0.
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*
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* Copyright 2019, 2020 Google LLC.
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*/
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#include <linux/bits.h>
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#include <linux/i2c.h>
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#include <linux/init.h>
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include "pmbus.h"
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#define REG_SETPT_DVID 0xd1
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#define DAC_10MV_MODE BIT(4)
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#define REG_IOUT_AVG_PK 0xee
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#define REG_IIN_SENSOR 0xf1
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#define REG_TOTAL_INPUT_POWER 0xf2
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#define REG_PHASE_ID 0xf3
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#define CORE_RAIL_INDICATOR BIT(7)
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#define REG_PHASE_REPORTING 0xf4
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struct max16601_data {
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struct pmbus_driver_info info;
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struct i2c_client *vsa;
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int iout_avg_pkg;
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};
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#define to_max16601_data(x) container_of(x, struct max16601_data, info)
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static int max16601_read_byte(struct i2c_client *client, int page, int reg)
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{
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const struct pmbus_driver_info *info = pmbus_get_driver_info(client);
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struct max16601_data *data = to_max16601_data(info);
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if (page > 0) {
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if (page == 2) /* VSA */
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return i2c_smbus_read_byte_data(data->vsa, reg);
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return -EOPNOTSUPP;
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}
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return -ENODATA;
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}
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static int max16601_read_word(struct i2c_client *client, int page, int phase,
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int reg)
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{
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const struct pmbus_driver_info *info = pmbus_get_driver_info(client);
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struct max16601_data *data = to_max16601_data(info);
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u8 buf[I2C_SMBUS_BLOCK_MAX + 1];
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int ret;
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switch (page) {
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case 0: /* VCORE */
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if (phase == 0xff)
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return -ENODATA;
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switch (reg) {
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case PMBUS_READ_IIN:
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case PMBUS_READ_IOUT:
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case PMBUS_READ_TEMPERATURE_1:
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ret = i2c_smbus_write_byte_data(client, REG_PHASE_ID,
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phase);
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if (ret)
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return ret;
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ret = i2c_smbus_read_block_data(client,
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REG_PHASE_REPORTING,
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buf);
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if (ret < 0)
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return ret;
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if (ret < 6)
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return -EIO;
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switch (reg) {
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case PMBUS_READ_TEMPERATURE_1:
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return buf[1] << 8 | buf[0];
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case PMBUS_READ_IOUT:
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return buf[3] << 8 | buf[2];
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case PMBUS_READ_IIN:
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return buf[5] << 8 | buf[4];
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default:
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break;
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}
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}
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return -EOPNOTSUPP;
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case 1: /* VCORE, read IIN/PIN from sensor element */
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switch (reg) {
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case PMBUS_READ_IIN:
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return i2c_smbus_read_word_data(client, REG_IIN_SENSOR);
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case PMBUS_READ_PIN:
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return i2c_smbus_read_word_data(client,
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REG_TOTAL_INPUT_POWER);
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default:
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break;
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}
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return -EOPNOTSUPP;
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case 2: /* VSA */
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switch (reg) {
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case PMBUS_VIRT_READ_IOUT_MAX:
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ret = i2c_smbus_read_word_data(data->vsa,
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REG_IOUT_AVG_PK);
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if (ret < 0)
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return ret;
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if (sign_extend32(ret, 10) >
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sign_extend32(data->iout_avg_pkg, 10))
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data->iout_avg_pkg = ret;
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return data->iout_avg_pkg;
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case PMBUS_VIRT_RESET_IOUT_HISTORY:
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return 0;
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case PMBUS_IOUT_OC_FAULT_LIMIT:
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case PMBUS_IOUT_OC_WARN_LIMIT:
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case PMBUS_OT_FAULT_LIMIT:
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case PMBUS_OT_WARN_LIMIT:
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case PMBUS_READ_IIN:
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case PMBUS_READ_IOUT:
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case PMBUS_READ_TEMPERATURE_1:
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case PMBUS_STATUS_WORD:
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return i2c_smbus_read_word_data(data->vsa, reg);
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default:
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return -EOPNOTSUPP;
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}
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default:
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return -EOPNOTSUPP;
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}
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}
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static int max16601_write_byte(struct i2c_client *client, int page, u8 reg)
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{
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const struct pmbus_driver_info *info = pmbus_get_driver_info(client);
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struct max16601_data *data = to_max16601_data(info);
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if (page == 2) {
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if (reg == PMBUS_CLEAR_FAULTS)
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return i2c_smbus_write_byte(data->vsa, reg);
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return -EOPNOTSUPP;
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}
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return -ENODATA;
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}
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static int max16601_write_word(struct i2c_client *client, int page, int reg,
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u16 value)
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{
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const struct pmbus_driver_info *info = pmbus_get_driver_info(client);
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struct max16601_data *data = to_max16601_data(info);
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switch (page) {
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case 0: /* VCORE */
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return -ENODATA;
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case 1: /* VCORE IIN/PIN from sensor element */
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default:
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return -EOPNOTSUPP;
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case 2: /* VSA */
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switch (reg) {
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case PMBUS_VIRT_RESET_IOUT_HISTORY:
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data->iout_avg_pkg = 0xfc00;
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return 0;
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case PMBUS_IOUT_OC_FAULT_LIMIT:
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case PMBUS_IOUT_OC_WARN_LIMIT:
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case PMBUS_OT_FAULT_LIMIT:
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case PMBUS_OT_WARN_LIMIT:
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return i2c_smbus_write_word_data(data->vsa, reg, value);
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default:
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return -EOPNOTSUPP;
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}
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}
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}
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static int max16601_identify(struct i2c_client *client,
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struct pmbus_driver_info *info)
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{
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int reg;
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reg = i2c_smbus_read_byte_data(client, REG_SETPT_DVID);
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if (reg < 0)
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return reg;
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if (reg & DAC_10MV_MODE)
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info->vrm_version[0] = vr13;
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else
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info->vrm_version[0] = vr12;
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return 0;
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}
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static struct pmbus_driver_info max16601_info = {
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.pages = 3,
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.format[PSC_VOLTAGE_IN] = linear,
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.format[PSC_VOLTAGE_OUT] = vid,
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.format[PSC_CURRENT_IN] = linear,
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.format[PSC_CURRENT_OUT] = linear,
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.format[PSC_TEMPERATURE] = linear,
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.format[PSC_POWER] = linear,
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.func[0] = PMBUS_HAVE_VIN | PMBUS_HAVE_IIN | PMBUS_HAVE_PIN |
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PMBUS_HAVE_STATUS_INPUT |
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PMBUS_HAVE_VOUT | PMBUS_HAVE_STATUS_VOUT |
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PMBUS_HAVE_IOUT | PMBUS_HAVE_STATUS_IOUT |
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PMBUS_HAVE_TEMP | PMBUS_HAVE_STATUS_TEMP |
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PMBUS_HAVE_POUT | PMBUS_PAGE_VIRTUAL | PMBUS_PHASE_VIRTUAL,
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.func[1] = PMBUS_HAVE_IIN | PMBUS_HAVE_PIN | PMBUS_PAGE_VIRTUAL,
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.func[2] = PMBUS_HAVE_IIN | PMBUS_HAVE_STATUS_INPUT |
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PMBUS_HAVE_IOUT | PMBUS_HAVE_STATUS_IOUT |
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PMBUS_HAVE_TEMP | PMBUS_HAVE_STATUS_TEMP | PMBUS_PAGE_VIRTUAL,
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.phases[0] = 8,
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.pfunc[0] = PMBUS_HAVE_IIN | PMBUS_HAVE_IOUT | PMBUS_HAVE_TEMP,
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.pfunc[1] = PMBUS_HAVE_IIN | PMBUS_HAVE_IOUT,
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.pfunc[2] = PMBUS_HAVE_IIN | PMBUS_HAVE_IOUT | PMBUS_HAVE_TEMP,
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.pfunc[3] = PMBUS_HAVE_IIN | PMBUS_HAVE_IOUT,
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.pfunc[4] = PMBUS_HAVE_IIN | PMBUS_HAVE_IOUT | PMBUS_HAVE_TEMP,
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.pfunc[5] = PMBUS_HAVE_IIN | PMBUS_HAVE_IOUT,
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.pfunc[6] = PMBUS_HAVE_IIN | PMBUS_HAVE_IOUT | PMBUS_HAVE_TEMP,
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.pfunc[7] = PMBUS_HAVE_IIN | PMBUS_HAVE_IOUT,
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.identify = max16601_identify,
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.read_byte_data = max16601_read_byte,
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.read_word_data = max16601_read_word,
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.write_byte = max16601_write_byte,
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.write_word_data = max16601_write_word,
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};
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static void max16601_remove(void *_data)
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{
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struct max16601_data *data = _data;
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i2c_unregister_device(data->vsa);
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}
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static int max16601_probe(struct i2c_client *client,
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const struct i2c_device_id *id)
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{
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struct device *dev = &client->dev;
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u8 buf[I2C_SMBUS_BLOCK_MAX + 1];
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struct max16601_data *data;
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int ret;
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if (!i2c_check_functionality(client->adapter,
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I2C_FUNC_SMBUS_READ_BYTE_DATA |
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I2C_FUNC_SMBUS_READ_BLOCK_DATA))
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return -ENODEV;
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ret = i2c_smbus_read_block_data(client, PMBUS_IC_DEVICE_ID, buf);
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if (ret < 0)
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return -ENODEV;
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/* PMBUS_IC_DEVICE_ID is expected to return "MAX16601y.xx" */
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if (ret < 11 || strncmp(buf, "MAX16601", 8)) {
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buf[ret] = '\0';
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dev_err(dev, "Unsupported chip '%s'\n", buf);
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return -ENODEV;
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}
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ret = i2c_smbus_read_byte_data(client, REG_PHASE_ID);
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if (ret < 0)
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return ret;
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if (!(ret & CORE_RAIL_INDICATOR)) {
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dev_err(dev,
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"Driver must be instantiated on CORE rail I2C address\n");
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return -ENODEV;
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}
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data = devm_kzalloc(dev, sizeof(*data), GFP_KERNEL);
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if (!data)
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return -ENOMEM;
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data->iout_avg_pkg = 0xfc00;
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data->vsa = i2c_new_dummy_device(client->adapter, client->addr + 1);
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if (IS_ERR(data->vsa)) {
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dev_err(dev, "Failed to register VSA client\n");
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return PTR_ERR(data->vsa);
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}
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ret = devm_add_action_or_reset(dev, max16601_remove, data);
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if (ret)
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return ret;
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data->info = max16601_info;
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return pmbus_do_probe(client, id, &data->info);
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}
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static const struct i2c_device_id max16601_id[] = {
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{"max16601", 0},
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{}
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};
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MODULE_DEVICE_TABLE(i2c, max16601_id);
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static struct i2c_driver max16601_driver = {
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.driver = {
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.name = "max16601",
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},
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.probe = max16601_probe,
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.remove = pmbus_do_remove,
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.id_table = max16601_id,
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};
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module_i2c_driver(max16601_driver);
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MODULE_AUTHOR("Guenter Roeck <linux@roeck-us.net>");
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MODULE_DESCRIPTION("PMBus driver for Maxim MAX16601");
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MODULE_LICENSE("GPL v2");
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