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150 lines
3.5 KiB
150 lines
3.5 KiB
// SPDX-License-Identifier: GPL-2.0+ |
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/* |
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* Hardware monitoring driver for Infineon PXE1610 |
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* |
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* Copyright (c) 2019 Facebook Inc |
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* |
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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 PXE1610_NUM_PAGES 3 |
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/* Identify chip parameters. */ |
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static int pxe1610_identify(struct i2c_client *client, |
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struct pmbus_driver_info *info) |
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{ |
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int i; |
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for (i = 0; i < PXE1610_NUM_PAGES; i++) { |
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if (pmbus_check_byte_register(client, i, PMBUS_VOUT_MODE)) { |
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u8 vout_mode; |
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int ret; |
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/* Read the register with VOUT scaling value.*/ |
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ret = pmbus_read_byte_data(client, i, PMBUS_VOUT_MODE); |
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if (ret < 0) |
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return ret; |
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vout_mode = ret & GENMASK(4, 0); |
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switch (vout_mode) { |
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case 1: |
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info->vrm_version[i] = vr12; |
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break; |
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case 2: |
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info->vrm_version[i] = vr13; |
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break; |
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default: |
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/* |
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* If prior pages are available limit operation |
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* to them |
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*/ |
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if (i != 0) { |
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info->pages = i; |
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return 0; |
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} |
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return -ENODEV; |
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} |
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} |
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} |
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return 0; |
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} |
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static struct pmbus_driver_info pxe1610_info = { |
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.pages = PXE1610_NUM_PAGES, |
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.format[PSC_VOLTAGE_IN] = linear, |
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.format[PSC_VOLTAGE_OUT] = vid, |
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.format[PSC_CURRENT_IN] = linear, |
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.format[PSC_CURRENT_OUT] = linear, |
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.format[PSC_TEMPERATURE] = linear, |
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.format[PSC_POWER] = linear, |
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.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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.func[1] = 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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.func[2] = 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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.identify = pxe1610_identify, |
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}; |
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static int pxe1610_probe(struct i2c_client *client) |
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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( |
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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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/* |
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* By default this device doesn't boot to page 0, so set page 0 |
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* to access all pmbus registers. |
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*/ |
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i2c_smbus_write_byte_data(client, PMBUS_PAGE, 0); |
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/* Read Manufacturer id */ |
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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, "XP", 2)) { |
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dev_err(&client->dev, "MFR_ID unrecognized\n"); |
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return -ENODEV; |
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} |
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info = devm_kmemdup(&client->dev, &pxe1610_info, |
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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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return pmbus_do_probe(client, info); |
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} |
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static const struct i2c_device_id pxe1610_id[] = { |
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{"pxe1610", 0}, |
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{"pxe1110", 0}, |
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{"pxm1310", 0}, |
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{} |
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}; |
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MODULE_DEVICE_TABLE(i2c, pxe1610_id); |
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static struct i2c_driver pxe1610_driver = { |
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.driver = { |
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.name = "pxe1610", |
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}, |
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.probe_new = pxe1610_probe, |
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.id_table = pxe1610_id, |
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}; |
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module_i2c_driver(pxe1610_driver); |
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MODULE_AUTHOR("Vijay Khemka <[email protected]>"); |
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MODULE_DESCRIPTION("PMBus driver for Infineon PXE1610, PXE1110 and PXM1310"); |
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MODULE_LICENSE("GPL");
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