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669cf162f7
Add Support for HiTRON HAC300S PSU. This is a AC/DC hot-swappable CompactPCI Serial Dual output active current sharing switching power supply with a 312W rating. Signed-off-by: Vasileios Amoiridis <vasileios.amoiridis@cern.ch> Link: https://lore.kernel.org/r/20260119190806.35276-3-vassilisamir@gmail.com [groeck: Fix whitespace / alignment problems; return -ENODATA from hac300s_read_byte_data() if the PMBus core can handle the operation] Signed-off-by: Guenter Roeck <linux@roeck-us.net>
133 lines
3.5 KiB
C
133 lines
3.5 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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// SPDX-FileCopyrightText: 2024 CERN (home.cern)
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/*
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* Hardware monitoring driver for Hi-Tron HAC300S PSU.
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*
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* NOTE: The HAC300S device does not support the PMBUS_VOUT_MODE register.
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* On top of that, it returns the Voltage output values in Linear11 which is
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* not adhering to the PMBus specifications. (PMBus Specification Part II,
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* Section 7.1-7.3). For that reason the PMBUS_VOUT_MODE register is being faked
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* and returns the exponent value of the READ_VOUT register. The exponent part
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* of the VOUT_* registers is being cleared in order to return the mantissa to
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* the pmbus core.
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*/
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#include <linux/bitfield.h>
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#include <linux/bits.h>
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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 <linux/pmbus.h>
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#include "pmbus.h"
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#define LINEAR11_EXPONENT_MASK GENMASK(15, 11)
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#define LINEAR11_MANTISSA_MASK GENMASK(10, 0)
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#define to_hac300s_data(x) container_of(x, struct hac300s_data, info)
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struct hac300s_data {
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struct pmbus_driver_info info;
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s8 exponent;
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};
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static int hac300s_read_byte_data(struct i2c_client *client, int page, int reg)
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{
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const struct pmbus_driver_info *info = pmbus_get_driver_info(client);
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struct hac300s_data *data = to_hac300s_data(info);
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if (reg == PMBUS_VOUT_MODE)
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return data->exponent;
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return -ENODATA;
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}
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static int hac300s_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 rv;
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switch (reg) {
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case PMBUS_VOUT_OV_WARN_LIMIT:
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case PMBUS_VOUT_UV_WARN_LIMIT:
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case PMBUS_VOUT_OV_FAULT_LIMIT:
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case PMBUS_VOUT_UV_FAULT_LIMIT:
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case PMBUS_MFR_VOUT_MAX:
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case PMBUS_MFR_VOUT_MIN:
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case PMBUS_READ_VOUT:
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rv = pmbus_read_word_data(client, page, phase, reg);
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return FIELD_GET(LINEAR11_MANTISSA_MASK, rv);
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default:
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return -ENODATA;
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}
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}
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static struct pmbus_driver_info hac300s_info = {
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.pages = 1,
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.func[0] = PMBUS_HAVE_TEMP | PMBUS_HAVE_TEMP2 | \
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PMBUS_HAVE_VOUT | PMBUS_HAVE_STATUS_VOUT | \
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PMBUS_HAVE_IOUT | PMBUS_HAVE_STATUS_IOUT | \
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PMBUS_HAVE_POUT | PMBUS_HAVE_STATUS_TEMP,
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.read_byte_data = hac300s_read_byte_data,
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.read_word_data = hac300s_read_word_data,
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.format[PSC_VOLTAGE_OUT] = linear,
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};
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static struct pmbus_platform_data hac300s_pdata = {
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.flags = PMBUS_NO_CAPABILITY,
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};
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static int hac300s_probe(struct i2c_client *client)
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{
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struct hac300s_data *data;
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int rv;
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data = devm_kzalloc(&client->dev, sizeof(struct hac300s_data), GFP_KERNEL);
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if (!data)
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return -ENOMEM;
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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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return -ENODEV;
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rv = i2c_smbus_read_word_data(client, PMBUS_READ_VOUT);
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if (rv < 0)
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return dev_err_probe(&client->dev, rv, "Failed to read vout_mode\n");
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data->exponent = FIELD_GET(LINEAR11_EXPONENT_MASK, rv);
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data->info = hac300s_info;
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client->dev.platform_data = &hac300s_pdata;
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return pmbus_do_probe(client, &data->info);
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}
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static const struct of_device_id hac300s_of_match[] = {
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{ .compatible = "hitron,hac300s" },
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{}
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};
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MODULE_DEVICE_TABLE(of, hac300s_of_match);
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static const struct i2c_device_id hac300s_id[] = {
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{"hac300s", 0},
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{}
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};
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MODULE_DEVICE_TABLE(i2c, hac300s_id);
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static struct i2c_driver hac300s_driver = {
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.driver = {
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.name = "hac300s",
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.of_match_table = hac300s_of_match,
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},
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.probe = hac300s_probe,
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.id_table = hac300s_id,
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};
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module_i2c_driver(hac300s_driver);
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MODULE_AUTHOR("Vasileios Amoiridis");
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MODULE_DESCRIPTION("PMBus driver for Hi-Tron HAC300S PSU");
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MODULE_LICENSE("GPL");
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MODULE_IMPORT_NS("PMBUS");
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