338 lines
8.3 KiB
C
338 lines
8.3 KiB
C
/*
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* Hardware monitoring driver for IR35221
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*
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* Copyright (C) IBM Corporation 2017.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version
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* 2 of the License, or (at your option) any later version.
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*/
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#include <linux/err.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 IR35221_MFR_VIN_PEAK 0xc5
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#define IR35221_MFR_VOUT_PEAK 0xc6
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#define IR35221_MFR_IOUT_PEAK 0xc7
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#define IR35221_MFR_TEMP_PEAK 0xc8
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#define IR35221_MFR_VIN_VALLEY 0xc9
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#define IR35221_MFR_VOUT_VALLEY 0xca
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#define IR35221_MFR_IOUT_VALLEY 0xcb
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#define IR35221_MFR_TEMP_VALLEY 0xcc
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static long ir35221_reg2data(int data, enum pmbus_sensor_classes class)
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{
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s16 exponent;
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s32 mantissa;
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long val;
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/* We only modify LINEAR11 formats */
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exponent = ((s16)data) >> 11;
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mantissa = ((s16)((data & 0x7ff) << 5)) >> 5;
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val = mantissa * 1000L;
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/* scale result to micro-units for power sensors */
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if (class == PSC_POWER)
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val = val * 1000L;
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if (exponent >= 0)
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val <<= exponent;
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else
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val >>= -exponent;
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return val;
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}
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#define MAX_MANTISSA (1023 * 1000)
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#define MIN_MANTISSA (511 * 1000)
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static u16 ir35221_data2reg(long val, enum pmbus_sensor_classes class)
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{
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s16 exponent = 0, mantissa;
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bool negative = false;
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if (val == 0)
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return 0;
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if (val < 0) {
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negative = true;
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val = -val;
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}
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/* Power is in uW. Convert to mW before converting. */
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if (class == PSC_POWER)
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val = DIV_ROUND_CLOSEST(val, 1000L);
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/* Reduce large mantissa until it fits into 10 bit */
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while (val >= MAX_MANTISSA && exponent < 15) {
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exponent++;
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val >>= 1;
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}
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/* Increase small mantissa to improve precision */
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while (val < MIN_MANTISSA && exponent > -15) {
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exponent--;
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val <<= 1;
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}
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/* Convert mantissa from milli-units to units */
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mantissa = DIV_ROUND_CLOSEST(val, 1000);
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/* Ensure that resulting number is within range */
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if (mantissa > 0x3ff)
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mantissa = 0x3ff;
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/* restore sign */
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if (negative)
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mantissa = -mantissa;
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/* Convert to 5 bit exponent, 11 bit mantissa */
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return (mantissa & 0x7ff) | ((exponent << 11) & 0xf800);
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}
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static u16 ir35221_scale_result(s16 data, int shift,
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enum pmbus_sensor_classes class)
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{
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long val;
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val = ir35221_reg2data(data, class);
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if (shift < 0)
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val >>= -shift;
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else
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val <<= shift;
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return ir35221_data2reg(val, class);
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}
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static int ir35221_read_word_data(struct i2c_client *client, int page, int reg)
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{
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int ret;
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switch (reg) {
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case PMBUS_IOUT_OC_FAULT_LIMIT:
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case PMBUS_IOUT_OC_WARN_LIMIT:
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ret = pmbus_read_word_data(client, page, reg);
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if (ret < 0)
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break;
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ret = ir35221_scale_result(ret, 1, PSC_CURRENT_OUT);
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break;
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case PMBUS_VIN_OV_FAULT_LIMIT:
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case PMBUS_VIN_OV_WARN_LIMIT:
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case PMBUS_VIN_UV_WARN_LIMIT:
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ret = pmbus_read_word_data(client, page, reg);
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ret = ir35221_scale_result(ret, -4, PSC_VOLTAGE_IN);
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break;
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case PMBUS_IIN_OC_WARN_LIMIT:
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ret = pmbus_read_word_data(client, page, reg);
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if (ret < 0)
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break;
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ret = ir35221_scale_result(ret, -1, PSC_CURRENT_IN);
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break;
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case PMBUS_READ_VIN:
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ret = pmbus_read_word_data(client, page, PMBUS_READ_VIN);
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if (ret < 0)
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break;
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ret = ir35221_scale_result(ret, -5, PSC_VOLTAGE_IN);
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break;
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case PMBUS_READ_IIN:
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ret = pmbus_read_word_data(client, page, PMBUS_READ_IIN);
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if (ret < 0)
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break;
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if (page == 0)
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ret = ir35221_scale_result(ret, -4, PSC_CURRENT_IN);
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else
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ret = ir35221_scale_result(ret, -5, PSC_CURRENT_IN);
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break;
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case PMBUS_READ_POUT:
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ret = pmbus_read_word_data(client, page, PMBUS_READ_POUT);
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if (ret < 0)
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break;
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ret = ir35221_scale_result(ret, -1, PSC_POWER);
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break;
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case PMBUS_READ_PIN:
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ret = pmbus_read_word_data(client, page, PMBUS_READ_PIN);
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if (ret < 0)
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break;
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ret = ir35221_scale_result(ret, -1, PSC_POWER);
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break;
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case PMBUS_READ_IOUT:
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ret = pmbus_read_word_data(client, page, PMBUS_READ_IOUT);
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if (ret < 0)
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break;
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if (page == 0)
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ret = ir35221_scale_result(ret, -1, PSC_CURRENT_OUT);
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else
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ret = ir35221_scale_result(ret, -2, PSC_CURRENT_OUT);
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break;
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case PMBUS_VIRT_READ_VIN_MAX:
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ret = pmbus_read_word_data(client, page, IR35221_MFR_VIN_PEAK);
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if (ret < 0)
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break;
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ret = ir35221_scale_result(ret, -5, PSC_VOLTAGE_IN);
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break;
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case PMBUS_VIRT_READ_VOUT_MAX:
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ret = pmbus_read_word_data(client, page, IR35221_MFR_VOUT_PEAK);
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break;
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case PMBUS_VIRT_READ_IOUT_MAX:
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ret = pmbus_read_word_data(client, page, IR35221_MFR_IOUT_PEAK);
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if (ret < 0)
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break;
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if (page == 0)
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ret = ir35221_scale_result(ret, -1, PSC_CURRENT_IN);
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else
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ret = ir35221_scale_result(ret, -2, PSC_CURRENT_IN);
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break;
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case PMBUS_VIRT_READ_TEMP_MAX:
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ret = pmbus_read_word_data(client, page, IR35221_MFR_TEMP_PEAK);
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break;
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case PMBUS_VIRT_READ_VIN_MIN:
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ret = pmbus_read_word_data(client, page,
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IR35221_MFR_VIN_VALLEY);
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if (ret < 0)
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break;
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ret = ir35221_scale_result(ret, -5, PSC_VOLTAGE_IN);
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break;
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case PMBUS_VIRT_READ_VOUT_MIN:
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ret = pmbus_read_word_data(client, page,
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IR35221_MFR_VOUT_VALLEY);
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break;
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case PMBUS_VIRT_READ_IOUT_MIN:
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ret = pmbus_read_word_data(client, page,
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IR35221_MFR_IOUT_VALLEY);
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if (ret < 0)
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break;
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if (page == 0)
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ret = ir35221_scale_result(ret, -1, PSC_CURRENT_IN);
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else
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ret = ir35221_scale_result(ret, -2, PSC_CURRENT_IN);
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break;
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case PMBUS_VIRT_READ_TEMP_MIN:
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ret = pmbus_read_word_data(client, page,
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IR35221_MFR_TEMP_VALLEY);
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break;
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default:
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ret = -ENODATA;
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break;
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}
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return ret;
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}
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static int ir35221_write_word_data(struct i2c_client *client, int page, int reg,
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u16 word)
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{
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int ret;
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u16 val;
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switch (reg) {
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case PMBUS_IOUT_OC_FAULT_LIMIT:
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case PMBUS_IOUT_OC_WARN_LIMIT:
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val = ir35221_scale_result(word, -1, PSC_CURRENT_OUT);
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ret = pmbus_write_word_data(client, page, reg, val);
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break;
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case PMBUS_VIN_OV_FAULT_LIMIT:
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case PMBUS_VIN_OV_WARN_LIMIT:
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case PMBUS_VIN_UV_WARN_LIMIT:
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val = ir35221_scale_result(word, 4, PSC_VOLTAGE_IN);
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ret = pmbus_write_word_data(client, page, reg, val);
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break;
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case PMBUS_IIN_OC_WARN_LIMIT:
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val = ir35221_scale_result(word, 1, PSC_CURRENT_IN);
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ret = pmbus_write_word_data(client, page, reg, val);
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break;
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default:
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ret = -ENODATA;
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break;
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}
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return ret;
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}
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static int ir35221_probe(struct i2c_client *client,
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const struct i2c_device_id *id)
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{
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struct pmbus_driver_info *info;
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u8 buf[I2C_SMBUS_BLOCK_MAX];
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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_WORD_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_MFR_ID, buf);
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if (ret < 0) {
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dev_err(&client->dev, "Failed to read PMBUS_MFR_ID\n");
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return ret;
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}
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if (ret != 2 || strncmp(buf, "RI", strlen("RI"))) {
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dev_err(&client->dev, "MFR_ID unrecognised\n");
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return -ENODEV;
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}
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ret = i2c_smbus_read_block_data(client, PMBUS_MFR_MODEL, buf);
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if (ret < 0) {
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dev_err(&client->dev, "Failed to read PMBUS_MFR_MODEL\n");
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return ret;
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}
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if (ret != 2 || !(buf[0] == 0x6c && buf[1] == 0x00)) {
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dev_err(&client->dev, "MFR_MODEL unrecognised\n");
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return -ENODEV;
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}
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info = devm_kzalloc(&client->dev, sizeof(struct pmbus_driver_info),
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GFP_KERNEL);
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if (!info)
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return -ENOMEM;
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info->write_word_data = ir35221_write_word_data;
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info->read_word_data = ir35221_read_word_data;
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info->pages = 2;
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info->format[PSC_VOLTAGE_IN] = linear;
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info->format[PSC_VOLTAGE_OUT] = linear;
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info->format[PSC_CURRENT_IN] = linear;
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info->format[PSC_CURRENT_OUT] = linear;
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info->format[PSC_POWER] = linear;
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info->format[PSC_TEMPERATURE] = linear;
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info->func[0] = PMBUS_HAVE_VIN
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| PMBUS_HAVE_VOUT | PMBUS_HAVE_IIN
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| PMBUS_HAVE_IOUT | PMBUS_HAVE_PIN
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| PMBUS_HAVE_POUT | PMBUS_HAVE_TEMP
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| PMBUS_HAVE_STATUS_VOUT | PMBUS_HAVE_STATUS_IOUT
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| PMBUS_HAVE_STATUS_INPUT | PMBUS_HAVE_STATUS_TEMP;
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info->func[1] = info->func[0];
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return pmbus_do_probe(client, id, info);
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}
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static const struct i2c_device_id ir35221_id[] = {
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{"ir35221", 0},
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{}
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};
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MODULE_DEVICE_TABLE(i2c, ir35221_id);
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static struct i2c_driver ir35221_driver = {
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.driver = {
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.name = "ir35221",
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},
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.probe = ir35221_probe,
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.remove = pmbus_do_remove,
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.id_table = ir35221_id,
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};
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module_i2c_driver(ir35221_driver);
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MODULE_AUTHOR("Samuel Mendoza-Jonas <sam@mendozajonas.com");
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MODULE_DESCRIPTION("PMBus driver for IR35221");
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MODULE_LICENSE("GPL");
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