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211 lines
4.9 KiB
211 lines
4.9 KiB
// SPDX-License-Identifier: GPL-2.0-or-later |
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/* |
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* Hardware monitoring driver for LTC3815 |
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* |
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* Copyright (c) 2015 Linear Technology |
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* Copyright (c) 2015 Guenter Roeck |
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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/jiffies.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 LTC3815_MFR_IOUT_PEAK 0xd7 |
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#define LTC3815_MFR_VOUT_PEAK 0xdd |
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#define LTC3815_MFR_VIN_PEAK 0xde |
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#define LTC3815_MFR_TEMP_PEAK 0xdf |
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#define LTC3815_MFR_IIN_PEAK 0xe1 |
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#define LTC3815_MFR_SPECIAL_ID 0xe7 |
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#define LTC3815_ID 0x8000 |
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#define LTC3815_ID_MASK 0xff00 |
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static int ltc3815_read_byte_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_VOUT_MODE: |
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/* |
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* The chip returns 0x3e, suggesting VID mode with manufacturer |
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* specific VID codes. Since the output voltage is reported |
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* with a LSB of 0.5mV, override and report direct mode with |
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* appropriate coefficients. |
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*/ |
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ret = 0x40; |
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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 ltc3815_write_byte(struct i2c_client *client, int page, u8 reg) |
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{ |
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int ret; |
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switch (reg) { |
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case PMBUS_CLEAR_FAULTS: |
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/* |
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* LTC3815 does not support the CLEAR_FAULTS command. |
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* Emulate it by clearing the status register. |
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*/ |
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ret = pmbus_read_word_data(client, 0, 0xff, PMBUS_STATUS_WORD); |
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if (ret > 0) { |
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pmbus_write_word_data(client, 0, PMBUS_STATUS_WORD, |
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ret); |
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ret = 0; |
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} |
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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 ltc3815_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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switch (reg) { |
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case PMBUS_VIRT_READ_VIN_MAX: |
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ret = pmbus_read_word_data(client, page, phase, |
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LTC3815_MFR_VIN_PEAK); |
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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, phase, |
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LTC3815_MFR_VOUT_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, page, phase, |
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LTC3815_MFR_TEMP_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, phase, |
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LTC3815_MFR_IOUT_PEAK); |
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break; |
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case PMBUS_VIRT_READ_IIN_MAX: |
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ret = pmbus_read_word_data(client, page, phase, |
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LTC3815_MFR_IIN_PEAK); |
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break; |
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case PMBUS_VIRT_RESET_VOUT_HISTORY: |
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case PMBUS_VIRT_RESET_VIN_HISTORY: |
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case PMBUS_VIRT_RESET_TEMP_HISTORY: |
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case PMBUS_VIRT_RESET_IOUT_HISTORY: |
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case PMBUS_VIRT_RESET_IIN_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 ltc3815_write_word_data(struct i2c_client *client, int page, |
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int reg, 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_IIN_HISTORY: |
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ret = pmbus_write_word_data(client, page, |
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LTC3815_MFR_IIN_PEAK, 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, page, |
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LTC3815_MFR_IOUT_PEAK, 0); |
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break; |
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case PMBUS_VIRT_RESET_VOUT_HISTORY: |
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ret = pmbus_write_word_data(client, page, |
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LTC3815_MFR_VOUT_PEAK, 0); |
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break; |
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case PMBUS_VIRT_RESET_VIN_HISTORY: |
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ret = pmbus_write_word_data(client, page, |
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LTC3815_MFR_VIN_PEAK, 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, page, |
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LTC3815_MFR_TEMP_PEAK, 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 const struct i2c_device_id ltc3815_id[] = { |
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{"ltc3815", 0}, |
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{ } |
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}; |
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MODULE_DEVICE_TABLE(i2c, ltc3815_id); |
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static struct pmbus_driver_info ltc3815_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_CURRENT_IN] = direct, |
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.format[PSC_CURRENT_OUT] = direct, |
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.format[PSC_TEMPERATURE] = direct, |
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.m[PSC_VOLTAGE_IN] = 250, |
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.b[PSC_VOLTAGE_IN] = 0, |
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.R[PSC_VOLTAGE_IN] = 0, |
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.m[PSC_VOLTAGE_OUT] = 2, |
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.b[PSC_VOLTAGE_OUT] = 0, |
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.R[PSC_VOLTAGE_OUT] = 3, |
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.m[PSC_CURRENT_IN] = 1, |
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.b[PSC_CURRENT_IN] = 0, |
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.R[PSC_CURRENT_IN] = 2, |
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.m[PSC_CURRENT_OUT] = 1, |
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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] = 1, |
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.b[PSC_TEMPERATURE] = 0, |
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.R[PSC_TEMPERATURE] = 0, |
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.func[0] = PMBUS_HAVE_VIN | PMBUS_HAVE_IIN | PMBUS_HAVE_VOUT | |
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PMBUS_HAVE_IOUT | PMBUS_HAVE_TEMP, |
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.read_byte_data = ltc3815_read_byte_data, |
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.read_word_data = ltc3815_read_word_data, |
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.write_byte = ltc3815_write_byte, |
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.write_word_data = ltc3815_write_word_data, |
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}; |
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static int ltc3815_probe(struct i2c_client *client) |
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{ |
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int chip_id; |
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if (!i2c_check_functionality(client->adapter, |
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I2C_FUNC_SMBUS_READ_WORD_DATA)) |
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return -ENODEV; |
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chip_id = i2c_smbus_read_word_data(client, LTC3815_MFR_SPECIAL_ID); |
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if (chip_id < 0) |
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return chip_id; |
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if ((chip_id & LTC3815_ID_MASK) != LTC3815_ID) |
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return -ENODEV; |
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return pmbus_do_probe(client, <c3815_info); |
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} |
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static struct i2c_driver ltc3815_driver = { |
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.driver = { |
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.name = "ltc3815", |
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}, |
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.probe_new = ltc3815_probe, |
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.id_table = ltc3815_id, |
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}; |
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module_i2c_driver(ltc3815_driver); |
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MODULE_AUTHOR("Guenter Roeck"); |
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MODULE_DESCRIPTION("PMBus driver for LTC3815"); |
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MODULE_LICENSE("GPL"); |
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MODULE_IMPORT_NS(PMBUS);
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