forked from mirrors/linux
e8e00c83a2
Add support for reading and decoding direct format coefficients to the PMBus core driver. If the new flag PMBUS_USE_COEFFICIENTS_CMD is set, the driver will use the COEFFICIENTS register together with the information in the pmbus_sensor_attr structs to initialize relevant coefficients for the direct mode format. Signed-off-by: Erik Rosen <erik.rosen@metormote.com> [groeck: Initialize ret with -EINVAL in pmbus_init_coefficients()] Signed-off-by: Guenter Roeck <linux@roeck-us.net>
84 lines
2.5 KiB
C
84 lines
2.5 KiB
C
/* SPDX-License-Identifier: GPL-2.0-or-later */
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/*
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* Hardware monitoring driver for PMBus devices
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*
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* Copyright (c) 2010, 2011 Ericsson AB.
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*/
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#ifndef _PMBUS_H_
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#define _PMBUS_H_
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#include <linux/bits.h>
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/* flags */
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/*
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* PMBUS_SKIP_STATUS_CHECK
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*
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* During register detection, skip checking the status register for
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* communication or command errors.
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*
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* Some PMBus chips respond with valid data when trying to read an unsupported
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* register. For such chips, checking the status register is mandatory when
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* trying to determine if a chip register exists or not.
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* Other PMBus chips don't support the STATUS_CML register, or report
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* communication errors for no explicable reason. For such chips, checking
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* the status register must be disabled.
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*/
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#define PMBUS_SKIP_STATUS_CHECK BIT(0)
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/*
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* PMBUS_WRITE_PROTECTED
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* Set if the chip is write protected and write protection is not determined
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* by the standard WRITE_PROTECT command.
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*/
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#define PMBUS_WRITE_PROTECTED BIT(1)
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/*
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* PMBUS_NO_CAPABILITY
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*
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* Some PMBus chips don't respond with valid data when reading the CAPABILITY
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* register. For such chips, this flag should be set so that the PMBus core
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* driver doesn't use CAPABILITY to determine it's behavior.
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*/
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#define PMBUS_NO_CAPABILITY BIT(2)
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/*
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* PMBUS_READ_STATUS_AFTER_FAILED_CHECK
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*
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* Some PMBus chips end up in an undefined state when trying to read an
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* unsupported register. For such chips, it is necessary to reset the
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* chip pmbus controller to a known state after a failed register check.
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* This can be done by reading a known register. By setting this flag the
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* driver will try to read the STATUS register after each failed
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* register check. This read may fail, but it will put the chip in a
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* known state.
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*/
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#define PMBUS_READ_STATUS_AFTER_FAILED_CHECK BIT(3)
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/*
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* PMBUS_NO_WRITE_PROTECT
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*
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* Some PMBus chips respond with invalid data when reading the WRITE_PROTECT
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* register. For such chips, this flag should be set so that the PMBus core
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* driver doesn't use the WRITE_PROTECT command to determine its behavior.
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*/
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#define PMBUS_NO_WRITE_PROTECT BIT(4)
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/*
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* PMBUS_USE_COEFFICIENTS_CMD
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*
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* When this flag is set the PMBus core driver will use the COEFFICIENTS
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* register to initialize the coefficients for the direct mode format.
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*/
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#define PMBUS_USE_COEFFICIENTS_CMD BIT(5)
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struct pmbus_platform_data {
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u32 flags; /* Device specific flags */
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/* regulator support */
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int num_regulators;
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struct regulator_init_data *reg_init_data;
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};
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#endif /* _PMBUS_H_ */
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