| // SPDX-License-Identifier: GPL-2.0+ |
| /* |
| * Hardware monitoring driver for Infineon PXE1610 |
| * |
| * Copyright (c) 2019 Facebook Inc |
| * |
| */ |
| |
| #include <linux/err.h> |
| #include <linux/i2c.h> |
| #include <linux/init.h> |
| #include <linux/kernel.h> |
| #include <linux/module.h> |
| #include "pmbus.h" |
| |
| #define PXE1610_NUM_PAGES 3 |
| |
| /* Identify chip parameters. */ |
| static int pxe1610_identify(struct i2c_client *client, |
| struct pmbus_driver_info *info) |
| { |
| if (pmbus_check_byte_register(client, 0, PMBUS_VOUT_MODE)) { |
| u8 vout_mode; |
| int ret; |
| |
| /* Read the register with VOUT scaling value.*/ |
| ret = pmbus_read_byte_data(client, 0, PMBUS_VOUT_MODE); |
| if (ret < 0) |
| return ret; |
| |
| vout_mode = ret & GENMASK(4, 0); |
| |
| switch (vout_mode) { |
| case 1: |
| info->vrm_version = vr12; |
| break; |
| case 2: |
| info->vrm_version = vr13; |
| break; |
| default: |
| return -ENODEV; |
| } |
| } |
| |
| return 0; |
| } |
| |
| static struct pmbus_driver_info pxe1610_info = { |
| .pages = PXE1610_NUM_PAGES, |
| .format[PSC_VOLTAGE_IN] = linear, |
| .format[PSC_VOLTAGE_OUT] = vid, |
| .format[PSC_CURRENT_IN] = linear, |
| .format[PSC_CURRENT_OUT] = linear, |
| .format[PSC_TEMPERATURE] = linear, |
| .format[PSC_POWER] = linear, |
| .func[0] = PMBUS_HAVE_VIN |
| | PMBUS_HAVE_VOUT | PMBUS_HAVE_IIN |
| | PMBUS_HAVE_IOUT | PMBUS_HAVE_PIN |
| | PMBUS_HAVE_POUT | PMBUS_HAVE_TEMP |
| | PMBUS_HAVE_STATUS_VOUT | PMBUS_HAVE_STATUS_IOUT |
| | PMBUS_HAVE_STATUS_INPUT | PMBUS_HAVE_STATUS_TEMP, |
| .func[1] = PMBUS_HAVE_VIN |
| | PMBUS_HAVE_VOUT | PMBUS_HAVE_IIN |
| | PMBUS_HAVE_IOUT | PMBUS_HAVE_PIN |
| | PMBUS_HAVE_POUT | PMBUS_HAVE_TEMP |
| | PMBUS_HAVE_STATUS_VOUT | PMBUS_HAVE_STATUS_IOUT |
| | PMBUS_HAVE_STATUS_INPUT | PMBUS_HAVE_STATUS_TEMP, |
| .func[2] = PMBUS_HAVE_VIN |
| | PMBUS_HAVE_VOUT | PMBUS_HAVE_IIN |
| | PMBUS_HAVE_IOUT | PMBUS_HAVE_PIN |
| | PMBUS_HAVE_POUT | PMBUS_HAVE_TEMP |
| | PMBUS_HAVE_STATUS_VOUT | PMBUS_HAVE_STATUS_IOUT |
| | PMBUS_HAVE_STATUS_INPUT | PMBUS_HAVE_STATUS_TEMP, |
| .identify = pxe1610_identify, |
| }; |
| |
| static int pxe1610_probe(struct i2c_client *client, |
| const struct i2c_device_id *id) |
| { |
| struct pmbus_driver_info *info; |
| u8 buf[I2C_SMBUS_BLOCK_MAX]; |
| int ret; |
| |
| if (!i2c_check_functionality( |
| client->adapter, |
| I2C_FUNC_SMBUS_READ_BYTE_DATA |
| | I2C_FUNC_SMBUS_READ_WORD_DATA |
| | I2C_FUNC_SMBUS_READ_BLOCK_DATA)) |
| return -ENODEV; |
| |
| /* |
| * By default this device doesn't boot to page 0, so set page 0 |
| * to access all pmbus registers. |
| */ |
| i2c_smbus_write_byte_data(client, PMBUS_PAGE, 0); |
| |
| /* Read Manufacturer id */ |
| ret = i2c_smbus_read_block_data(client, PMBUS_MFR_ID, buf); |
| if (ret < 0) { |
| dev_err(&client->dev, "Failed to read PMBUS_MFR_ID\n"); |
| return ret; |
| } |
| if (ret != 2 || strncmp(buf, "XP", 2)) { |
| dev_err(&client->dev, "MFR_ID unrecognized\n"); |
| return -ENODEV; |
| } |
| |
| info = devm_kmemdup(&client->dev, &pxe1610_info, |
| sizeof(struct pmbus_driver_info), |
| GFP_KERNEL); |
| if (!info) |
| return -ENOMEM; |
| |
| return pmbus_do_probe(client, id, info); |
| } |
| |
| static const struct i2c_device_id pxe1610_id[] = { |
| {"pxe1610", 0}, |
| {"pxe1110", 0}, |
| {"pxm1310", 0}, |
| {} |
| }; |
| |
| MODULE_DEVICE_TABLE(i2c, pxe1610_id); |
| |
| static struct i2c_driver pxe1610_driver = { |
| .driver = { |
| .name = "pxe1610", |
| }, |
| .probe = pxe1610_probe, |
| .remove = pmbus_do_remove, |
| .id_table = pxe1610_id, |
| }; |
| |
| module_i2c_driver(pxe1610_driver); |
| |
| MODULE_AUTHOR("Vijay Khemka <vijaykhemka@fb.com>"); |
| MODULE_DESCRIPTION("PMBus driver for Infineon PXE1610, PXE1110 and PXM1310"); |
| MODULE_LICENSE("GPL"); |