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cd228e7b65
Add support for MPS Hot-Swap controller mp5920. This driver exposes telemetry and limit value readings and writings. Signed-off-by: Alex Vdovydchenko <xzeol@yahoo.com> Reviewed-by: Thomas Weißschuh <linux@weissschuh.net> Link: https://lore.kernel.org/r/20240702115252.981416-3-xzeol@yahoo.com [groeck: Use min_t() to limit length of displayed model string] Signed-off-by: Guenter Roeck <linux@roeck-us.net>
91 lines
2.2 KiB
C
91 lines
2.2 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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* Hardware monitoring driver for MP5920 and compatible chips.
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*/
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#include <linux/i2c.h>
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#include <linux/minmax.h>
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#include <linux/module.h>
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#include <linux/of_device.h>
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#include "pmbus.h"
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static struct pmbus_driver_info mp5920_info = {
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.pages = 1,
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.format[PSC_VOLTAGE_IN] = direct,
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.format[PSC_VOLTAGE_OUT] = direct,
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.format[PSC_CURRENT_OUT] = direct,
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.format[PSC_POWER] = direct,
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.format[PSC_TEMPERATURE] = direct,
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.m[PSC_VOLTAGE_IN] = 2266,
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.b[PSC_VOLTAGE_IN] = 0,
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.R[PSC_VOLTAGE_IN] = -1,
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.m[PSC_VOLTAGE_OUT] = 2266,
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.b[PSC_VOLTAGE_OUT] = 0,
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.R[PSC_VOLTAGE_OUT] = -1,
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.m[PSC_CURRENT_OUT] = 546,
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.b[PSC_CURRENT_OUT] = 0,
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.R[PSC_CURRENT_OUT] = -2,
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.m[PSC_POWER] = 5840,
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.b[PSC_POWER] = 0,
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.R[PSC_POWER] = -3,
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.m[PSC_TEMPERATURE] = 1067,
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.b[PSC_TEMPERATURE] = 20500,
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.R[PSC_TEMPERATURE] = -2,
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.func[0] = PMBUS_HAVE_VIN | PMBUS_HAVE_VOUT |
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PMBUS_HAVE_IOUT | PMBUS_HAVE_POUT |
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PMBUS_HAVE_TEMP,
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};
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static int mp5920_probe(struct i2c_client *client)
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{
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struct device *dev = &client->dev;
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int ret;
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u8 buf[I2C_SMBUS_BLOCK_MAX];
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if (!i2c_check_functionality(client->adapter,
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I2C_FUNC_SMBUS_READ_WORD_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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return dev_err_probe(dev, ret, "Failed to read PMBUS_MFR_MODEL\n");
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if (ret != 6 || strncmp(buf, "MP5920", 6)) {
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return dev_err_probe(dev, -ENODEV, "Model '%.*s' not supported\n",
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min_t(int, ret, sizeof(buf)), buf);
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}
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return pmbus_do_probe(client, &mp5920_info);
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}
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static const struct of_device_id mp5920_of_match[] = {
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{ .compatible = "mps,mp5920" },
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{ }
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};
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MODULE_DEVICE_TABLE(of, mp5920_of_match);
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static const struct i2c_device_id mp5920_id[] = {
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{ "mp5920" },
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{ }
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};
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MODULE_DEVICE_TABLE(i2c, mp5920_id);
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static struct i2c_driver mp5920_driver = {
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.driver = {
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.name = "mp5920",
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.of_match_table = mp5920_of_match,
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},
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.probe = mp5920_probe,
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.id_table = mp5920_id,
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};
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module_i2c_driver(mp5920_driver);
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MODULE_AUTHOR("Tony Ao <tony_ao@wiwynn.com>");
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MODULE_AUTHOR("Alex Vdovydchenko <xzeol@yahoo.com>");
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MODULE_DESCRIPTION("PMBus driver for MP5920 HSC");
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MODULE_LICENSE("GPL");
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MODULE_IMPORT_NS(PMBUS);
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