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194 lines
4.8 KiB
194 lines
4.8 KiB
// SPDX-License-Identifier: GPL-2.0-or-later |
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/* |
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* Hardware monitoring driver for Maxim MAX8688 |
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* |
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* Copyright (c) 2011 Ericsson AB. |
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*/ |
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#include <linux/bitops.h> |
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#include <linux/kernel.h> |
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#include <linux/module.h> |
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#include <linux/init.h> |
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#include <linux/err.h> |
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#include <linux/i2c.h> |
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#include "pmbus.h" |
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#define MAX8688_MFR_VOUT_PEAK 0xd4 |
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#define MAX8688_MFR_IOUT_PEAK 0xd5 |
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#define MAX8688_MFR_TEMPERATURE_PEAK 0xd6 |
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#define MAX8688_MFG_STATUS 0xd8 |
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#define MAX8688_STATUS_OC_FAULT BIT(4) |
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#define MAX8688_STATUS_OV_FAULT BIT(5) |
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#define MAX8688_STATUS_OV_WARNING BIT(8) |
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#define MAX8688_STATUS_UV_FAULT BIT(9) |
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#define MAX8688_STATUS_UV_WARNING BIT(10) |
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#define MAX8688_STATUS_UC_FAULT BIT(11) |
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#define MAX8688_STATUS_OC_WARNING BIT(12) |
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#define MAX8688_STATUS_OT_FAULT BIT(13) |
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#define MAX8688_STATUS_OT_WARNING BIT(14) |
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static int max8688_read_word_data(struct i2c_client *client, int page, |
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int phase, int reg) |
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{ |
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int ret; |
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if (page > 0) |
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return -ENXIO; |
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switch (reg) { |
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case PMBUS_VIRT_READ_VOUT_MAX: |
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ret = pmbus_read_word_data(client, 0, 0xff, |
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MAX8688_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, 0, 0xff, |
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MAX8688_MFR_IOUT_PEAK); |
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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, 0, 0xff, |
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MAX8688_MFR_TEMPERATURE_PEAK); |
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break; |
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case PMBUS_VIRT_RESET_VOUT_HISTORY: |
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case PMBUS_VIRT_RESET_IOUT_HISTORY: |
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case PMBUS_VIRT_RESET_TEMP_HISTORY: |
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ret = 0; |
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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 max8688_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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switch (reg) { |
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case PMBUS_VIRT_RESET_VOUT_HISTORY: |
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ret = pmbus_write_word_data(client, 0, MAX8688_MFR_VOUT_PEAK, |
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0); |
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break; |
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case PMBUS_VIRT_RESET_IOUT_HISTORY: |
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ret = pmbus_write_word_data(client, 0, MAX8688_MFR_IOUT_PEAK, |
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0); |
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break; |
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case PMBUS_VIRT_RESET_TEMP_HISTORY: |
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ret = pmbus_write_word_data(client, 0, |
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MAX8688_MFR_TEMPERATURE_PEAK, |
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0xffff); |
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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 max8688_read_byte_data(struct i2c_client *client, int page, int reg) |
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{ |
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int ret = 0; |
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int mfg_status; |
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if (page > 0) |
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return -ENXIO; |
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switch (reg) { |
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case PMBUS_STATUS_VOUT: |
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mfg_status = pmbus_read_word_data(client, 0, 0xff, |
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MAX8688_MFG_STATUS); |
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if (mfg_status < 0) |
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return mfg_status; |
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if (mfg_status & MAX8688_STATUS_UV_WARNING) |
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ret |= PB_VOLTAGE_UV_WARNING; |
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if (mfg_status & MAX8688_STATUS_UV_FAULT) |
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ret |= PB_VOLTAGE_UV_FAULT; |
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if (mfg_status & MAX8688_STATUS_OV_WARNING) |
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ret |= PB_VOLTAGE_OV_WARNING; |
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if (mfg_status & MAX8688_STATUS_OV_FAULT) |
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ret |= PB_VOLTAGE_OV_FAULT; |
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break; |
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case PMBUS_STATUS_IOUT: |
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mfg_status = pmbus_read_word_data(client, 0, 0xff, |
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MAX8688_MFG_STATUS); |
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if (mfg_status < 0) |
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return mfg_status; |
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if (mfg_status & MAX8688_STATUS_UC_FAULT) |
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ret |= PB_IOUT_UC_FAULT; |
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if (mfg_status & MAX8688_STATUS_OC_WARNING) |
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ret |= PB_IOUT_OC_WARNING; |
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if (mfg_status & MAX8688_STATUS_OC_FAULT) |
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ret |= PB_IOUT_OC_FAULT; |
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break; |
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case PMBUS_STATUS_TEMPERATURE: |
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mfg_status = pmbus_read_word_data(client, 0, 0xff, |
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MAX8688_MFG_STATUS); |
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if (mfg_status < 0) |
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return mfg_status; |
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if (mfg_status & MAX8688_STATUS_OT_WARNING) |
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ret |= PB_TEMP_OT_WARNING; |
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if (mfg_status & MAX8688_STATUS_OT_FAULT) |
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ret |= PB_TEMP_OT_FAULT; |
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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 struct pmbus_driver_info max8688_info = { |
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.pages = 1, |
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.format[PSC_VOLTAGE_IN] = direct, |
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.format[PSC_VOLTAGE_OUT] = direct, |
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.format[PSC_TEMPERATURE] = direct, |
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.format[PSC_CURRENT_OUT] = direct, |
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.m[PSC_VOLTAGE_IN] = 19995, |
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.b[PSC_VOLTAGE_IN] = 0, |
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.R[PSC_VOLTAGE_IN] = -1, |
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.m[PSC_VOLTAGE_OUT] = 19995, |
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.b[PSC_VOLTAGE_OUT] = 0, |
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.R[PSC_VOLTAGE_OUT] = -1, |
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.m[PSC_CURRENT_OUT] = 23109, |
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.b[PSC_CURRENT_OUT] = 0, |
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.R[PSC_CURRENT_OUT] = -2, |
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.m[PSC_TEMPERATURE] = -7612, |
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.b[PSC_TEMPERATURE] = 335, |
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.R[PSC_TEMPERATURE] = -3, |
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.func[0] = PMBUS_HAVE_VOUT | PMBUS_HAVE_IOUT | PMBUS_HAVE_TEMP |
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| PMBUS_HAVE_STATUS_VOUT | PMBUS_HAVE_STATUS_IOUT |
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| PMBUS_HAVE_STATUS_TEMP, |
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.read_byte_data = max8688_read_byte_data, |
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.read_word_data = max8688_read_word_data, |
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.write_word_data = max8688_write_word_data, |
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}; |
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static int max8688_probe(struct i2c_client *client) |
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{ |
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return pmbus_do_probe(client, &max8688_info); |
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} |
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static const struct i2c_device_id max8688_id[] = { |
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{"max8688", 0}, |
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{ } |
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}; |
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MODULE_DEVICE_TABLE(i2c, max8688_id); |
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/* This is the driver that will be inserted */ |
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static struct i2c_driver max8688_driver = { |
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.driver = { |
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.name = "max8688", |
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}, |
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.probe_new = max8688_probe, |
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.id_table = max8688_id, |
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}; |
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module_i2c_driver(max8688_driver); |
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MODULE_AUTHOR("Guenter Roeck"); |
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MODULE_DESCRIPTION("PMBus driver for Maxim MAX8688"); |
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MODULE_LICENSE("GPL"); |
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MODULE_IMPORT_NS(PMBUS);
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