include/linux/pmbus.h

   1 /* SPDX-License-Identifier: GPL-2.0-or-later */
   2 /*
   3  * Hardware monitoring driver for PMBus devices
   4  *
   5  * Copyright (c) 2010, 2011 Ericsson AB.
   6  */
   7
   8 #ifndef _PMBUS_H_
   9 #define _PMBUS_H_
  10
  11 #include <linux/bits.h>
  12
  13 /* flags */
  14
  15 /*
  16  * PMBUS_SKIP_STATUS_CHECK
  17  *
  18  * During register detection, skip checking the status register for
  19  * communication or command errors.
  20  *
  21  * Some PMBus chips respond with valid data when trying to read an unsupported
  22  * register. For such chips, checking the status register is mandatory when
  23  * trying to determine if a chip register exists or not.
  24  * Other PMBus chips don't support the STATUS_CML register, or report
  25  * communication errors for no explicable reason. For such chips, checking
  26  * the status register must be disabled.
  27  */
  28 #define PMBUS_SKIP_STATUS_CHECK BIT(0)
  29
  30 /*
  31  * PMBUS_WRITE_PROTECTED
  32  * Set if the chip is write protected and write protection is not determined
  33  * by the standard WRITE_PROTECT command.
  34  */
  35 #define PMBUS_WRITE_PROTECTED   BIT(1)
  36
  37 /*
  38  * PMBUS_NO_CAPABILITY
  39  *
  40  * Some PMBus chips don't respond with valid data when reading the CAPABILITY
  41  * register. For such chips, this flag should be set so that the PMBus core
  42  * driver doesn't use CAPABILITY to determine it's behavior.
  43  */
  44 #define PMBUS_NO_CAPABILITY                     BIT(2)
  45
  46 /*
  47  * PMBUS_READ_STATUS_AFTER_FAILED_CHECK
  48  *
  49  * Some PMBus chips end up in an undefined state when trying to read an
  50  * unsupported register. For such chips, it is necessary to reset the
  51  * chip pmbus controller to a known state after a failed register check.
  52  * This can be done by reading a known register. By setting this flag the
  53  * driver will try to read the STATUS register after each failed
  54  * register check. This read may fail, but it will put the chip in a
  55  * known state.
  56  */
  57 #define PMBUS_READ_STATUS_AFTER_FAILED_CHECK    BIT(3)
  58
  59 /*
  60  * PMBUS_NO_WRITE_PROTECT
  61  *
  62  * Some PMBus chips respond with invalid data when reading the WRITE_PROTECT
  63  * register. For such chips, this flag should be set so that the PMBus core
  64  * driver doesn't use the WRITE_PROTECT command to determine its behavior.
  65  */
  66 #define PMBUS_NO_WRITE_PROTECT                  BIT(4)
  67
  68 /*
  69  * PMBUS_USE_COEFFICIENTS_CMD
  70  *
  71  * When this flag is set the PMBus core driver will use the COEFFICIENTS
  72  * register to initialize the coefficients for the direct mode format.
  73  */
  74 #define PMBUS_USE_COEFFICIENTS_CMD              BIT(5)
  75
  76 struct pmbus_platform_data {
  77         u32 flags;              /* Device specific flags */
  78
  79         /* regulator support */
  80         int num_regulators;
  81         struct regulator_init_data *reg_init_data;
  82 };
  83
  84 #endif /* _PMBUS_H_ */