156 lines
3.9 KiB
C
156 lines
3.9 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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* Hardware monitoring driver for Sony APS-379 Power Supplies
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*
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* Copyright 2026 Allied Telesis Labs
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*/
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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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/*
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* The VOUT format used by the chip is linear11, not linear16. Provide a hard
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* coded VOUT_MODE that says VOUT is in linear mode with a fixed exponent of
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* 2^-4.
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*/
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#define APS_379_VOUT_MODE ((u8)(-4 & 0x1f))
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static int aps_379_read_byte_data(struct i2c_client *client, int page, int reg)
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{
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switch (reg) {
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case PMBUS_VOUT_MODE:
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return APS_379_VOUT_MODE;
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default:
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return -ENODATA;
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}
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}
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/*
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* The APS-379 uses linear11 format instead of linear16. We've reported the exponent
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* via the PMBUS_VOUT_MODE so we just return the mantissa here.
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*/
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static int aps_379_read_vout(struct i2c_client *client)
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{
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int ret;
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ret = pmbus_read_word_data(client, 0, 0xff, PMBUS_READ_VOUT);
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if (ret < 0)
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return ret;
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return clamp_val(sign_extend32(ret & 0x7ff, 10), 0, 0x3ff);
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}
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static int aps_379_read_word_data(struct i2c_client *client, int page, int phase, int reg)
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{
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switch (reg) {
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case PMBUS_VOUT_UV_WARN_LIMIT:
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case PMBUS_VOUT_OV_WARN_LIMIT:
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case PMBUS_VOUT_UV_FAULT_LIMIT:
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case PMBUS_VOUT_OV_FAULT_LIMIT:
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case PMBUS_IOUT_OC_WARN_LIMIT:
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case PMBUS_IOUT_UC_FAULT_LIMIT:
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case PMBUS_UT_WARN_LIMIT:
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case PMBUS_UT_FAULT_LIMIT:
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case PMBUS_OT_WARN_LIMIT:
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case PMBUS_OT_FAULT_LIMIT:
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case PMBUS_PIN_OP_WARN_LIMIT:
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case PMBUS_POUT_OP_WARN_LIMIT:
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case PMBUS_MFR_IIN_MAX:
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case PMBUS_MFR_PIN_MAX:
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case PMBUS_MFR_VOUT_MIN:
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case PMBUS_MFR_VOUT_MAX:
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case PMBUS_MFR_IOUT_MAX:
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case PMBUS_MFR_POUT_MAX:
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case PMBUS_MFR_MAX_TEMP_1:
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/* These commands return data but it is invalid/un-documented */
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return -ENXIO;
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case PMBUS_IOUT_OC_FAULT_LIMIT:
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/*
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* The standard requires this to be a value in Amps but it's
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* actually a percentage of the rated output (123A for
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* 110-240Vac, 110A for 90-100Vac) which we don't know. Ignore
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* it rather than guessing.
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*/
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return -ENXIO;
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case PMBUS_READ_VOUT:
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return aps_379_read_vout(client);
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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 aps_379_info = {
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.pages = 1,
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.format[PSC_VOLTAGE_OUT] = linear,
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.format[PSC_CURRENT_OUT] = linear,
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.format[PSC_POWER] = linear,
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.format[PSC_TEMPERATURE] = linear,
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.format[PSC_FAN] = linear,
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.func[0] = PMBUS_HAVE_VOUT |
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PMBUS_HAVE_IOUT |
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PMBUS_HAVE_PIN | PMBUS_HAVE_POUT |
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PMBUS_HAVE_TEMP |
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PMBUS_HAVE_FAN12,
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.read_byte_data = aps_379_read_byte_data,
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.read_word_data = aps_379_read_word_data,
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};
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static const struct i2c_device_id aps_379_id[] = {
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{ .name = "aps-379" },
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{ }
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};
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MODULE_DEVICE_TABLE(i2c, aps_379_id);
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static int aps_379_probe(struct i2c_client *client)
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{
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struct device *dev = &client->dev;
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u8 buf[I2C_SMBUS_BLOCK_MAX + 1] = { 0 };
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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_MODEL, buf);
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if (ret < 0) {
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dev_err(dev, "Failed to read Manufacturer Model\n");
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return ret;
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}
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if (strncasecmp(buf, aps_379_id[0].name, strlen(aps_379_id[0].name)) != 0) {
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buf[ret] = '\0';
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dev_err(dev, "Unsupported Manufacturer Model '%s'\n", buf);
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return -ENODEV;
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}
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return pmbus_do_probe(client, &aps_379_info);
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}
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static const struct of_device_id __maybe_unused aps_379_of_match[] = {
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{ .compatible = "sony,aps-379" },
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{},
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};
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MODULE_DEVICE_TABLE(of, aps_379_of_match);
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static struct i2c_driver aps_379_driver = {
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.driver = {
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.name = "aps-379",
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.of_match_table = of_match_ptr(aps_379_of_match),
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},
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.probe = aps_379_probe,
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.id_table = aps_379_id,
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};
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module_i2c_driver(aps_379_driver);
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MODULE_AUTHOR("Chris Packham");
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MODULE_DESCRIPTION("PMBus driver for Sony APS-379");
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MODULE_LICENSE("GPL");
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MODULE_IMPORT_NS("PMBUS");
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