mirror of https://gitee.com/openkylin/linux.git
140 lines
3.3 KiB
C
140 lines
3.3 KiB
C
// 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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if (pmbus_check_byte_register(client, 0, 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, 0, 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 = vr12;
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break;
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case 2:
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info->vrm_version = vr13;
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break;
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default:
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return -ENODEV;
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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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const struct i2c_device_id *id)
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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, id, 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 = pxe1610_probe,
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.remove = pmbus_do_remove,
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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 <vijaykhemka@fb.com>");
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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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