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148 lines
3.7 KiB
148 lines
3.7 KiB
// SPDX-License-Identifier: GPL-2.0-or-later |
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/* |
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* Hardware monitoring driver for IR35221 |
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* |
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* Copyright (C) IBM Corporation 2017. |
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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 IR35221_MFR_VIN_PEAK 0xc5 |
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#define IR35221_MFR_VOUT_PEAK 0xc6 |
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#define IR35221_MFR_IOUT_PEAK 0xc7 |
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#define IR35221_MFR_TEMP_PEAK 0xc8 |
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#define IR35221_MFR_VIN_VALLEY 0xc9 |
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#define IR35221_MFR_VOUT_VALLEY 0xca |
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#define IR35221_MFR_IOUT_VALLEY 0xcb |
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#define IR35221_MFR_TEMP_VALLEY 0xcc |
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static int ir35221_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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IR35221_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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IR35221_MFR_VOUT_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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IR35221_MFR_IOUT_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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IR35221_MFR_TEMP_PEAK); |
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break; |
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case PMBUS_VIRT_READ_VIN_MIN: |
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ret = pmbus_read_word_data(client, page, phase, |
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IR35221_MFR_VIN_VALLEY); |
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break; |
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case PMBUS_VIRT_READ_VOUT_MIN: |
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ret = pmbus_read_word_data(client, page, phase, |
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IR35221_MFR_VOUT_VALLEY); |
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break; |
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case PMBUS_VIRT_READ_IOUT_MIN: |
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ret = pmbus_read_word_data(client, page, phase, |
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IR35221_MFR_IOUT_VALLEY); |
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break; |
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case PMBUS_VIRT_READ_TEMP_MIN: |
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ret = pmbus_read_word_data(client, page, phase, |
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IR35221_MFR_TEMP_VALLEY); |
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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 ir35221_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(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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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, "RI", strlen("RI"))) { |
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dev_err(&client->dev, "MFR_ID unrecognised\n"); |
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return -ENODEV; |
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} |
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ret = i2c_smbus_read_block_data(client, PMBUS_MFR_MODEL, buf); |
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if (ret < 0) { |
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dev_err(&client->dev, "Failed to read PMBUS_MFR_MODEL\n"); |
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return ret; |
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} |
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if (ret != 2 || !(buf[0] == 0x6c && buf[1] == 0x00)) { |
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dev_err(&client->dev, "MFR_MODEL unrecognised\n"); |
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return -ENODEV; |
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} |
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info = devm_kzalloc(&client->dev, 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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info->read_word_data = ir35221_read_word_data; |
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info->pages = 2; |
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info->format[PSC_VOLTAGE_IN] = linear; |
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info->format[PSC_VOLTAGE_OUT] = linear; |
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info->format[PSC_CURRENT_IN] = linear; |
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info->format[PSC_CURRENT_OUT] = linear; |
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info->format[PSC_POWER] = linear; |
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info->format[PSC_TEMPERATURE] = linear; |
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info->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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info->func[1] = info->func[0]; |
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return pmbus_do_probe(client, info); |
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} |
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static const struct i2c_device_id ir35221_id[] = { |
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{"ir35221", 0}, |
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{} |
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}; |
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MODULE_DEVICE_TABLE(i2c, ir35221_id); |
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static struct i2c_driver ir35221_driver = { |
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.driver = { |
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.name = "ir35221", |
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}, |
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.probe_new = ir35221_probe, |
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.id_table = ir35221_id, |
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}; |
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module_i2c_driver(ir35221_driver); |
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MODULE_AUTHOR("Samuel Mendoza-Jonas <[email protected]"); |
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MODULE_DESCRIPTION("PMBus driver for IR35221"); |
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MODULE_LICENSE("GPL"); |
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MODULE_IMPORT_NS(PMBUS);
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