Author | Tokens | Token Proportion | Commits | Commit Proportion |
---|---|---|---|---|
Guenter Roeck | 797 | 99.62% | 3 | 60.00% |
Thomas Gleixner | 2 | 0.25% | 1 | 20.00% |
Uwe Kleine-König | 1 | 0.12% | 1 | 20.00% |
Total | 800 | 5 |
// SPDX-License-Identifier: GPL-2.0-or-later /* * Hardware monitoring driver for LTC3815 * * Copyright (c) 2015 Linear Technology * Copyright (c) 2015 Guenter Roeck */ #include <linux/err.h> #include <linux/i2c.h> #include <linux/init.h> #include <linux/jiffies.h> #include <linux/kernel.h> #include <linux/module.h> #include "pmbus.h" #define LTC3815_MFR_IOUT_PEAK 0xd7 #define LTC3815_MFR_VOUT_PEAK 0xdd #define LTC3815_MFR_VIN_PEAK 0xde #define LTC3815_MFR_TEMP_PEAK 0xdf #define LTC3815_MFR_IIN_PEAK 0xe1 #define LTC3815_MFR_SPECIAL_ID 0xe7 #define LTC3815_ID 0x8000 #define LTC3815_ID_MASK 0xff00 static int ltc3815_read_byte_data(struct i2c_client *client, int page, int reg) { int ret; switch (reg) { case PMBUS_VOUT_MODE: /* * The chip returns 0x3e, suggesting VID mode with manufacturer * specific VID codes. Since the output voltage is reported * with a LSB of 0.5mV, override and report direct mode with * appropriate coefficients. */ ret = 0x40; break; default: ret = -ENODATA; break; } return ret; } static int ltc3815_write_byte(struct i2c_client *client, int page, u8 reg) { int ret; switch (reg) { case PMBUS_CLEAR_FAULTS: /* * LTC3815 does not support the CLEAR_FAULTS command. * Emulate it by clearing the status register. */ ret = pmbus_read_word_data(client, 0, 0xff, PMBUS_STATUS_WORD); if (ret > 0) { pmbus_write_word_data(client, 0, PMBUS_STATUS_WORD, ret); ret = 0; } break; default: ret = -ENODATA; break; } return ret; } static int ltc3815_read_word_data(struct i2c_client *client, int page, int phase, int reg) { int ret; switch (reg) { case PMBUS_VIRT_READ_VIN_MAX: ret = pmbus_read_word_data(client, page, phase, LTC3815_MFR_VIN_PEAK); break; case PMBUS_VIRT_READ_VOUT_MAX: ret = pmbus_read_word_data(client, page, phase, LTC3815_MFR_VOUT_PEAK); break; case PMBUS_VIRT_READ_TEMP_MAX: ret = pmbus_read_word_data(client, page, phase, LTC3815_MFR_TEMP_PEAK); break; case PMBUS_VIRT_READ_IOUT_MAX: ret = pmbus_read_word_data(client, page, phase, LTC3815_MFR_IOUT_PEAK); break; case PMBUS_VIRT_READ_IIN_MAX: ret = pmbus_read_word_data(client, page, phase, LTC3815_MFR_IIN_PEAK); break; case PMBUS_VIRT_RESET_VOUT_HISTORY: case PMBUS_VIRT_RESET_VIN_HISTORY: case PMBUS_VIRT_RESET_TEMP_HISTORY: case PMBUS_VIRT_RESET_IOUT_HISTORY: case PMBUS_VIRT_RESET_IIN_HISTORY: ret = 0; break; default: ret = -ENODATA; break; } return ret; } static int ltc3815_write_word_data(struct i2c_client *client, int page, int reg, u16 word) { int ret; switch (reg) { case PMBUS_VIRT_RESET_IIN_HISTORY: ret = pmbus_write_word_data(client, page, LTC3815_MFR_IIN_PEAK, 0); break; case PMBUS_VIRT_RESET_IOUT_HISTORY: ret = pmbus_write_word_data(client, page, LTC3815_MFR_IOUT_PEAK, 0); break; case PMBUS_VIRT_RESET_VOUT_HISTORY: ret = pmbus_write_word_data(client, page, LTC3815_MFR_VOUT_PEAK, 0); break; case PMBUS_VIRT_RESET_VIN_HISTORY: ret = pmbus_write_word_data(client, page, LTC3815_MFR_VIN_PEAK, 0); break; case PMBUS_VIRT_RESET_TEMP_HISTORY: ret = pmbus_write_word_data(client, page, LTC3815_MFR_TEMP_PEAK, 0); break; default: ret = -ENODATA; break; } return ret; } static const struct i2c_device_id ltc3815_id[] = { {"ltc3815", 0}, { } }; MODULE_DEVICE_TABLE(i2c, ltc3815_id); static struct pmbus_driver_info ltc3815_info = { .pages = 1, .format[PSC_VOLTAGE_IN] = direct, .format[PSC_VOLTAGE_OUT] = direct, .format[PSC_CURRENT_IN] = direct, .format[PSC_CURRENT_OUT] = direct, .format[PSC_TEMPERATURE] = direct, .m[PSC_VOLTAGE_IN] = 250, .b[PSC_VOLTAGE_IN] = 0, .R[PSC_VOLTAGE_IN] = 0, .m[PSC_VOLTAGE_OUT] = 2, .b[PSC_VOLTAGE_OUT] = 0, .R[PSC_VOLTAGE_OUT] = 3, .m[PSC_CURRENT_IN] = 1, .b[PSC_CURRENT_IN] = 0, .R[PSC_CURRENT_IN] = 2, .m[PSC_CURRENT_OUT] = 1, .b[PSC_CURRENT_OUT] = 0, .R[PSC_CURRENT_OUT] = 2, .m[PSC_TEMPERATURE] = 1, .b[PSC_TEMPERATURE] = 0, .R[PSC_TEMPERATURE] = 0, .func[0] = PMBUS_HAVE_VIN | PMBUS_HAVE_IIN | PMBUS_HAVE_VOUT | PMBUS_HAVE_IOUT | PMBUS_HAVE_TEMP, .read_byte_data = ltc3815_read_byte_data, .read_word_data = ltc3815_read_word_data, .write_byte = ltc3815_write_byte, .write_word_data = ltc3815_write_word_data, }; static int ltc3815_probe(struct i2c_client *client) { int chip_id; if (!i2c_check_functionality(client->adapter, I2C_FUNC_SMBUS_READ_WORD_DATA)) return -ENODEV; chip_id = i2c_smbus_read_word_data(client, LTC3815_MFR_SPECIAL_ID); if (chip_id < 0) return chip_id; if ((chip_id & LTC3815_ID_MASK) != LTC3815_ID) return -ENODEV; return pmbus_do_probe(client, <c3815_info); } static struct i2c_driver ltc3815_driver = { .driver = { .name = "ltc3815", }, .probe = ltc3815_probe, .id_table = ltc3815_id, }; module_i2c_driver(ltc3815_driver); MODULE_AUTHOR("Guenter Roeck"); MODULE_DESCRIPTION("PMBus driver for LTC3815"); MODULE_LICENSE("GPL"); MODULE_IMPORT_NS(PMBUS);
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