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    Subject[PATCH v5 1/5] hwmon: PMBus device driver
    Date
    This driver adds support for hardware monitoring features of various PMBus
    devices.

    Signed-off-by: Guenter Roeck <guenter.roeck@ericsson.com>
    ---
    drivers/hwmon/Kconfig | 25 +
    drivers/hwmon/Makefile | 4 +
    drivers/hwmon/pmbus.c | 203 ++++++
    drivers/hwmon/pmbus.h | 313 +++++++++
    drivers/hwmon/pmbus_core.c | 1628 ++++++++++++++++++++++++++++++++++++++++++++
    include/linux/i2c/pmbus.h | 45 ++
    6 files changed, 2218 insertions(+), 0 deletions(-)
    create mode 100644 drivers/hwmon/pmbus.c
    create mode 100644 drivers/hwmon/pmbus.h
    create mode 100644 drivers/hwmon/pmbus_core.c
    create mode 100644 include/linux/i2c/pmbus.h

    diff --git a/drivers/hwmon/Kconfig b/drivers/hwmon/Kconfig
    index 297bc9a..948d319 100644
    --- a/drivers/hwmon/Kconfig
    +++ b/drivers/hwmon/Kconfig
    @@ -735,6 +735,31 @@ config SENSORS_PCF8591
    These devices are hard to detect and rarely found on mainstream
    hardware. If unsure, say N.

    +config PMBUS
    + tristate "PMBus support"
    + depends on I2C && EXPERIMENTAL
    + default n
    + help
    + Say yes here if you want to enable PMBus support.
    +
    + This driver can also be built as a module. If so, the module will
    + be called pmbus_core.
    +
    +if PMBUS
    +
    +config SENSORS_PMBUS
    + tristate "Generic PMBus devices"
    + default n
    + help
    + If you say yes here you get hardware monitoring support for generic
    + PMBus devices, including but not limited to BMR450, BMR451, BMR453,
    + BMR454, and LTC2978.
    +
    + This driver can also be built as a module. If so, the module will
    + be called pmbus.
    +
    +endif # PMBUS
    +
    config SENSORS_SHT15
    tristate "Sensiron humidity and temperature sensors. SHT15 and compat."
    depends on GENERIC_GPIO
    diff --git a/drivers/hwmon/Makefile b/drivers/hwmon/Makefile
    index dde02d9..f7f158b 100644
    --- a/drivers/hwmon/Makefile
    +++ b/drivers/hwmon/Makefile
    @@ -112,6 +112,10 @@ obj-$(CONFIG_SENSORS_W83L786NG) += w83l786ng.o
    obj-$(CONFIG_SENSORS_WM831X) += wm831x-hwmon.o
    obj-$(CONFIG_SENSORS_WM8350) += wm8350-hwmon.o

    +# PMBus drivers
    +obj-$(CONFIG_PMBUS) += pmbus_core.o
    +obj-$(CONFIG_SENSORS_PMBUS) += pmbus.o
    +
    ifeq ($(CONFIG_HWMON_DEBUG_CHIP),y)
    EXTRA_CFLAGS += -DDEBUG
    endif
    diff --git a/drivers/hwmon/pmbus.c b/drivers/hwmon/pmbus.c
    new file mode 100644
    index 0000000..98e2e28
    --- /dev/null
    +++ b/drivers/hwmon/pmbus.c
    @@ -0,0 +1,203 @@
    +/*
    + * Hardware monitoring driver for PMBus devices
    + *
    + * Copyright (c) 2010, 2011 Ericsson AB.
    + *
    + * This program is free software; you can redistribute it and/or modify
    + * it under the terms of the GNU General Public License as published by
    + * the Free Software Foundation; either version 2 of the License, or
    + * (at your option) any later version.
    + *
    + * This program is distributed in the hope that it will be useful,
    + * but WITHOUT ANY WARRANTY; without even the implied warranty of
    + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
    + * GNU General Public License for more details.
    + *
    + * You should have received a copy of the GNU General Public License
    + * along with this program; if not, write to the Free Software
    + * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
    + */
    +
    +#include <linux/kernel.h>
    +#include <linux/module.h>
    +#include <linux/init.h>
    +#include <linux/err.h>
    +#include <linux/slab.h>
    +#include <linux/mutex.h>
    +#include <linux/i2c.h>
    +#include "pmbus.h"
    +
    +/*
    + * Find sensor groups and status registers on each page.
    + */
    +static void pmbus_find_sensor_groups(struct i2c_client *client,
    + struct pmbus_driver_info *info)
    +{
    + int page;
    +
    + /* Sensors detected on page 0 only */
    + if (pmbus_check_word_register(client, 0, PMBUS_READ_VIN))
    + info->func[0] |= PMBUS_HAVE_VIN;
    + if (pmbus_check_word_register(client, 0, PMBUS_READ_VCAP))
    + info->func[0] |= PMBUS_HAVE_VCAP;
    + if (pmbus_check_word_register(client, 0, PMBUS_READ_IIN))
    + info->func[0] |= PMBUS_HAVE_IIN;
    + if (pmbus_check_word_register(client, 0, PMBUS_READ_PIN))
    + info->func[0] |= PMBUS_HAVE_PIN;
    + if (info->func[0]
    + && pmbus_check_byte_register(client, 0, PMBUS_STATUS_INPUT))
    + info->func[0] |= PMBUS_HAVE_STATUS_INPUT;
    + if (pmbus_check_word_register(client, 0, PMBUS_READ_FAN_SPEED_1)) {
    + info->func[0] |= PMBUS_HAVE_FAN12;
    + if (pmbus_check_byte_register(client, 0, PMBUS_STATUS_FAN_12))
    + info->func[0] |= PMBUS_HAVE_STATUS_FAN12;
    + }
    + if (pmbus_check_word_register(client, 0, PMBUS_READ_FAN_SPEED_3)) {
    + info->func[0] |= PMBUS_HAVE_FAN34;
    + if (pmbus_check_byte_register(client, 0, PMBUS_STATUS_FAN_34))
    + info->func[0] |= PMBUS_HAVE_STATUS_FAN34;
    + }
    + if (pmbus_check_word_register(client, 0, PMBUS_READ_TEMPERATURE_1)) {
    + info->func[0] |= PMBUS_HAVE_TEMP;
    + if (pmbus_check_byte_register(client, 0,
    + PMBUS_STATUS_TEMPERATURE))
    + info->func[0] |= PMBUS_HAVE_STATUS_TEMP;
    + }
    +
    + /* Sensors detected on all pages */
    + for (page = 0; page < info->pages; page++) {
    + if (pmbus_check_word_register(client, page, PMBUS_READ_VOUT)) {
    + info->func[page] |= PMBUS_HAVE_VOUT;
    + if (pmbus_check_byte_register(client, page,
    + PMBUS_STATUS_VOUT))
    + info->func[page] |= PMBUS_HAVE_STATUS_VOUT;
    + }
    + if (pmbus_check_word_register(client, page, PMBUS_READ_IOUT)) {
    + info->func[page] |= PMBUS_HAVE_IOUT;
    + if (pmbus_check_byte_register(client, 0,
    + PMBUS_STATUS_IOUT))
    + info->func[page] |= PMBUS_HAVE_STATUS_IOUT;
    + }
    + if (pmbus_check_word_register(client, page, PMBUS_READ_POUT))
    + info->func[page] |= PMBUS_HAVE_POUT;
    + }
    +}
    +
    +/*
    + * Identify chip parameters.
    + */
    +static int pmbus_identify(struct i2c_client *client,
    + struct pmbus_driver_info *info)
    +{
    + if (!info->pages) {
    + /*
    + * Check if the PAGE command is supported. If it is,
    + * keep setting the page number until it fails or until the
    + * maximum number of pages has been reached. Assume that
    + * this is the number of pages supported by the chip.
    + */
    + if (pmbus_check_byte_register(client, 0, PMBUS_PAGE)) {
    + int page;
    +
    + for (page = 1; page < PMBUS_PAGES; page++) {
    + if (pmbus_set_page(client, page) < 0)
    + break;
    + }
    + pmbus_set_page(client, 0);
    + info->pages = page;
    + } else {
    + info->pages = 1;
    + }
    + }
    +
    + /*
    + * We should check if the COEFFICIENTS register is supported.
    + * If it is, and the chip is configured for direct mode, we can read
    + * the coefficients from the chip, one set per group of sensor
    + * registers.
    + *
    + * To do this, we will need access to a chip which actually supports the
    + * COEFFICIENTS command, since the command is too complex to implement
    + * without testing it.
    + */
    +
    + /* Try to find sensor groups */
    + pmbus_find_sensor_groups(client, info);
    +
    + return 0;
    +}
    +
    +static int pmbus_probe(struct i2c_client *client,
    + const struct i2c_device_id *id)
    +{
    + struct pmbus_driver_info *info;
    + int ret;
    +
    + info = kzalloc(sizeof(struct pmbus_driver_info), GFP_KERNEL);
    + if (!info)
    + return -ENOMEM;
    +
    + info->pages = id->driver_data;
    + info->identify = pmbus_identify;
    +
    + ret = pmbus_do_probe(client, id, info);
    + if (ret < 0)
    + goto out;
    + return 0;
    +
    +out:
    + kfree(info);
    + return ret;
    +}
    +
    +static int pmbus_remove(struct i2c_client *client)
    +{
    + int ret;
    + const struct pmbus_driver_info *info;
    +
    + info = pmbus_get_driver_info(client);
    + ret = pmbus_do_remove(client);
    + kfree(info);
    + return ret;
    +}
    +
    +/*
    + * Use driver_data to set the number of pages supported by the chip.
    + */
    +static const struct i2c_device_id pmbus_id[] = {
    + {"bmr450", 1},
    + {"bmr451", 1},
    + {"bmr453", 1},
    + {"bmr454", 1},
    + {"ltc2978", 8},
    + {"pmbus", 0},
    + {}
    +};
    +
    +MODULE_DEVICE_TABLE(i2c, pmbus_id);
    +
    +/* This is the driver that will be inserted */
    +static struct i2c_driver pmbus_driver = {
    + .driver = {
    + .name = "pmbus",
    + },
    + .probe = pmbus_probe,
    + .remove = pmbus_remove,
    + .id_table = pmbus_id,
    +};
    +
    +static int __init pmbus_init(void)
    +{
    + return i2c_add_driver(&pmbus_driver);
    +}
    +
    +static void __exit pmbus_exit(void)
    +{
    + i2c_del_driver(&pmbus_driver);
    +}
    +
    +MODULE_AUTHOR("Guenter Roeck");
    +MODULE_DESCRIPTION("Generic PMBus driver");
    +MODULE_LICENSE("GPL");
    +module_init(pmbus_init);
    +module_exit(pmbus_exit);
    diff --git a/drivers/hwmon/pmbus.h b/drivers/hwmon/pmbus.h
    new file mode 100644
    index 0000000..a81f7f2
    --- /dev/null
    +++ b/drivers/hwmon/pmbus.h
    @@ -0,0 +1,313 @@
    +/*
    + * pmbus.h - Common defines and structures for PMBus devices
    + *
    + * Copyright (c) 2010, 2011 Ericsson AB.
    + *
    + * This program is free software; you can redistribute it and/or modify
    + * it under the terms of the GNU General Public License as published by
    + * the Free Software Foundation; either version 2 of the License, or
    + * (at your option) any later version.
    + *
    + * This program is distributed in the hope that it will be useful,
    + * but WITHOUT ANY WARRANTY; without even the implied warranty of
    + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
    + * GNU General Public License for more details.
    + *
    + * You should have received a copy of the GNU General Public License
    + * along with this program; if not, write to the Free Software
    + * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
    + */
    +
    +#ifndef PMBUS_H
    +#define PMBUS_H
    +
    +/*
    + * Registers
    + */
    +#define PMBUS_PAGE 0x00
    +#define PMBUS_OPERATION 0x01
    +#define PMBUS_ON_OFF_CONFIG 0x02
    +#define PMBUS_CLEAR_FAULTS 0x03
    +#define PMBUS_PHASE 0x04
    +
    +#define PMBUS_CAPABILITY 0x19
    +#define PMBUS_QUERY 0x1A
    +
    +#define PMBUS_VOUT_MODE 0x20
    +#define PMBUS_VOUT_COMMAND 0x21
    +#define PMBUS_VOUT_TRIM 0x22
    +#define PMBUS_VOUT_CAL_OFFSET 0x23
    +#define PMBUS_VOUT_MAX 0x24
    +#define PMBUS_VOUT_MARGIN_HIGH 0x25
    +#define PMBUS_VOUT_MARGIN_LOW 0x26
    +#define PMBUS_VOUT_TRANSITION_RATE 0x27
    +#define PMBUS_VOUT_DROOP 0x28
    +#define PMBUS_VOUT_SCALE_LOOP 0x29
    +#define PMBUS_VOUT_SCALE_MONITOR 0x2A
    +
    +#define PMBUS_COEFFICIENTS 0x30
    +#define PMBUS_POUT_MAX 0x31
    +
    +#define PMBUS_FAN_CONFIG_12 0x3A
    +#define PMBUS_FAN_COMMAND_1 0x3B
    +#define PMBUS_FAN_COMMAND_2 0x3C
    +#define PMBUS_FAN_CONFIG_34 0x3D
    +#define PMBUS_FAN_COMMAND_3 0x3E
    +#define PMBUS_FAN_COMMAND_4 0x3F
    +
    +#define PMBUS_VOUT_OV_FAULT_LIMIT 0x40
    +#define PMBUS_VOUT_OV_FAULT_RESPONSE 0x41
    +#define PMBUS_VOUT_OV_WARN_LIMIT 0x42
    +#define PMBUS_VOUT_UV_WARN_LIMIT 0x43
    +#define PMBUS_VOUT_UV_FAULT_LIMIT 0x44
    +#define PMBUS_VOUT_UV_FAULT_RESPONSE 0x45
    +#define PMBUS_IOUT_OC_FAULT_LIMIT 0x46
    +#define PMBUS_IOUT_OC_FAULT_RESPONSE 0x47
    +#define PMBUS_IOUT_OC_LV_FAULT_LIMIT 0x48
    +#define PMBUS_IOUT_OC_LV_FAULT_RESPONSE 0x49
    +#define PMBUS_IOUT_OC_WARN_LIMIT 0x4A
    +#define PMBUS_IOUT_UC_FAULT_LIMIT 0x4B
    +#define PMBUS_IOUT_UC_FAULT_RESPONSE 0x4C
    +
    +#define PMBUS_OT_FAULT_LIMIT 0x4F
    +#define PMBUS_OT_FAULT_RESPONSE 0x50
    +#define PMBUS_OT_WARN_LIMIT 0x51
    +#define PMBUS_UT_WARN_LIMIT 0x52
    +#define PMBUS_UT_FAULT_LIMIT 0x53
    +#define PMBUS_UT_FAULT_RESPONSE 0x54
    +#define PMBUS_VIN_OV_FAULT_LIMIT 0x55
    +#define PMBUS_VIN_OV_FAULT_RESPONSE 0x56
    +#define PMBUS_VIN_OV_WARN_LIMIT 0x57
    +#define PMBUS_VIN_UV_WARN_LIMIT 0x58
    +#define PMBUS_VIN_UV_FAULT_LIMIT 0x59
    +
    +#define PMBUS_IIN_OC_FAULT_LIMIT 0x5B
    +#define PMBUS_IIN_OC_WARN_LIMIT 0x5D
    +
    +#define PMBUS_POUT_OP_FAULT_LIMIT 0x68
    +#define PMBUS_POUT_OP_WARN_LIMIT 0x6A
    +#define PMBUS_PIN_OP_WARN_LIMIT 0x6B
    +
    +#define PMBUS_STATUS_BYTE 0x78
    +#define PMBUS_STATUS_WORD 0x79
    +#define PMBUS_STATUS_VOUT 0x7A
    +#define PMBUS_STATUS_IOUT 0x7B
    +#define PMBUS_STATUS_INPUT 0x7C
    +#define PMBUS_STATUS_TEMPERATURE 0x7D
    +#define PMBUS_STATUS_CML 0x7E
    +#define PMBUS_STATUS_OTHER 0x7F
    +#define PMBUS_STATUS_MFR_SPECIFIC 0x80
    +#define PMBUS_STATUS_FAN_12 0x81
    +#define PMBUS_STATUS_FAN_34 0x82
    +
    +#define PMBUS_READ_VIN 0x88
    +#define PMBUS_READ_IIN 0x89
    +#define PMBUS_READ_VCAP 0x8A
    +#define PMBUS_READ_VOUT 0x8B
    +#define PMBUS_READ_IOUT 0x8C
    +#define PMBUS_READ_TEMPERATURE_1 0x8D
    +#define PMBUS_READ_TEMPERATURE_2 0x8E
    +#define PMBUS_READ_TEMPERATURE_3 0x8F
    +#define PMBUS_READ_FAN_SPEED_1 0x90
    +#define PMBUS_READ_FAN_SPEED_2 0x91
    +#define PMBUS_READ_FAN_SPEED_3 0x92
    +#define PMBUS_READ_FAN_SPEED_4 0x93
    +#define PMBUS_READ_DUTY_CYCLE 0x94
    +#define PMBUS_READ_FREQUENCY 0x95
    +#define PMBUS_READ_POUT 0x96
    +#define PMBUS_READ_PIN 0x97
    +
    +#define PMBUS_REVISION 0x98
    +#define PMBUS_MFR_ID 0x99
    +#define PMBUS_MFR_MODEL 0x9A
    +#define PMBUS_MFR_REVISION 0x9B
    +#define PMBUS_MFR_LOCATION 0x9C
    +#define PMBUS_MFR_DATE 0x9D
    +#define PMBUS_MFR_SERIAL 0x9E
    +
    +/*
    + * CAPABILITY
    + */
    +#define PB_CAPABILITY_SMBALERT (1<<4)
    +#define PB_CAPABILITY_ERROR_CHECK (1<<7)
    +
    +/*
    + * VOUT_MODE
    + */
    +#define PB_VOUT_MODE_MODE_MASK 0xe0
    +#define PB_VOUT_MODE_PARAM_MASK 0x1f
    +
    +#define PB_VOUT_MODE_LINEAR 0x00
    +#define PB_VOUT_MODE_VID 0x20
    +#define PB_VOUT_MODE_DIRECT 0x40
    +
    +/*
    + * Fan configuration
    + */
    +#define PB_FAN_2_PULSE_MASK ((1 << 0) | (1 << 1))
    +#define PB_FAN_2_RPM (1 << 2)
    +#define PB_FAN_2_INSTALLED (1 << 3)
    +#define PB_FAN_1_PULSE_MASK ((1 << 4) | (1 << 5))
    +#define PB_FAN_1_RPM (1 << 6)
    +#define PB_FAN_1_INSTALLED (1 << 7)
    +
    +/*
    + * STATUS_BYTE, STATUS_WORD (lower)
    + */
    +#define PB_STATUS_NONE_ABOVE (1<<0)
    +#define PB_STATUS_CML (1<<1)
    +#define PB_STATUS_TEMPERATURE (1<<2)
    +#define PB_STATUS_VIN_UV (1<<3)
    +#define PB_STATUS_IOUT_OC (1<<4)
    +#define PB_STATUS_VOUT_OV (1<<5)
    +#define PB_STATUS_OFF (1<<6)
    +#define PB_STATUS_BUSY (1<<7)
    +
    +/*
    + * STATUS_WORD (upper)
    + */
    +#define PB_STATUS_UNKNOWN (1<<8)
    +#define PB_STATUS_OTHER (1<<9)
    +#define PB_STATUS_FANS (1<<10)
    +#define PB_STATUS_POWER_GOOD_N (1<<11)
    +#define PB_STATUS_WORD_MFR (1<<12)
    +#define PB_STATUS_INPUT (1<<13)
    +#define PB_STATUS_IOUT_POUT (1<<14)
    +#define PB_STATUS_VOUT (1<<15)
    +
    +/*
    + * STATUS_IOUT
    + */
    +#define PB_POUT_OP_WARNING (1<<0)
    +#define PB_POUT_OP_FAULT (1<<1)
    +#define PB_POWER_LIMITING (1<<2)
    +#define PB_CURRENT_SHARE_FAULT (1<<3)
    +#define PB_IOUT_UC_FAULT (1<<4)
    +#define PB_IOUT_OC_WARNING (1<<5)
    +#define PB_IOUT_OC_LV_FAULT (1<<6)
    +#define PB_IOUT_OC_FAULT (1<<7)
    +
    +/*
    + * STATUS_VOUT, STATUS_INPUT
    + */
    +#define PB_VOLTAGE_UV_FAULT (1<<4)
    +#define PB_VOLTAGE_UV_WARNING (1<<5)
    +#define PB_VOLTAGE_OV_WARNING (1<<6)
    +#define PB_VOLTAGE_OV_FAULT (1<<7)
    +
    +/*
    + * STATUS_INPUT
    + */
    +#define PB_PIN_OP_WARNING (1<<0)
    +#define PB_IIN_OC_WARNING (1<<1)
    +#define PB_IIN_OC_FAULT (1<<2)
    +
    +/*
    + * STATUS_TEMPERATURE
    + */
    +#define PB_TEMP_UT_FAULT (1<<4)
    +#define PB_TEMP_UT_WARNING (1<<5)
    +#define PB_TEMP_OT_WARNING (1<<6)
    +#define PB_TEMP_OT_FAULT (1<<7)
    +
    +/*
    + * STATUS_FAN
    + */
    +#define PB_FAN_AIRFLOW_WARNING (1<<0)
    +#define PB_FAN_AIRFLOW_FAULT (1<<1)
    +#define PB_FAN_FAN2_SPEED_OVERRIDE (1<<2)
    +#define PB_FAN_FAN1_SPEED_OVERRIDE (1<<3)
    +#define PB_FAN_FAN2_WARNING (1<<4)
    +#define PB_FAN_FAN1_WARNING (1<<5)
    +#define PB_FAN_FAN2_FAULT (1<<6)
    +#define PB_FAN_FAN1_FAULT (1<<7)
    +
    +/*
    + * CML_FAULT_STATUS
    + */
    +#define PB_CML_FAULT_OTHER_MEM_LOGIC (1<<0)
    +#define PB_CML_FAULT_OTHER_COMM (1<<1)
    +#define PB_CML_FAULT_PROCESSOR (1<<3)
    +#define PB_CML_FAULT_MEMORY (1<<4)
    +#define PB_CML_FAULT_PACKET_ERROR (1<<5)
    +#define PB_CML_FAULT_INVALID_DATA (1<<6)
    +#define PB_CML_FAULT_INVALID_COMMAND (1<<7)
    +
    +enum pmbus_sensor_classes {
    + PSC_VOLTAGE_IN = 0,
    + PSC_VOLTAGE_OUT,
    + PSC_CURRENT_IN,
    + PSC_CURRENT_OUT,
    + PSC_POWER,
    + PSC_TEMPERATURE,
    + PSC_FAN,
    + PSC_NUM_CLASSES /* Number of power sensor classes */
    +};
    +
    +#define PMBUS_PAGES 32 /* Per PMBus specification */
    +
    +/* Functionality bit mask */
    +#define PMBUS_HAVE_VIN (1 << 0)
    +#define PMBUS_HAVE_VCAP (1 << 1)
    +#define PMBUS_HAVE_VOUT (1 << 2)
    +#define PMBUS_HAVE_IIN (1 << 3)
    +#define PMBUS_HAVE_IOUT (1 << 4)
    +#define PMBUS_HAVE_PIN (1 << 5)
    +#define PMBUS_HAVE_POUT (1 << 6)
    +#define PMBUS_HAVE_FAN12 (1 << 7)
    +#define PMBUS_HAVE_FAN34 (1 << 8)
    +#define PMBUS_HAVE_TEMP (1 << 9)
    +#define PMBUS_HAVE_TEMP2 (1 << 10)
    +#define PMBUS_HAVE_TEMP3 (1 << 11)
    +#define PMBUS_HAVE_STATUS_VOUT (1 << 12)
    +#define PMBUS_HAVE_STATUS_IOUT (1 << 13)
    +#define PMBUS_HAVE_STATUS_INPUT (1 << 14)
    +#define PMBUS_HAVE_STATUS_TEMP (1 << 15)
    +#define PMBUS_HAVE_STATUS_FAN12 (1 << 16)
    +#define PMBUS_HAVE_STATUS_FAN34 (1 << 17)
    +
    +struct pmbus_driver_info {
    + int pages; /* Total number of pages */
    + bool direct[PSC_NUM_CLASSES];
    + /* true if device uses direct data format
    + for the given sensor class */
    + /*
    + * Support one set of coefficients for each sensor type
    + * Used for chips providing data in direct mode.
    + */
    + int m[PSC_NUM_CLASSES]; /* mantissa for direct data format */
    + int b[PSC_NUM_CLASSES]; /* offset */
    + int R[PSC_NUM_CLASSES]; /* exponent */
    +
    + u32 func[PMBUS_PAGES]; /* Functionality, per page */
    + /*
    + * The get_status function maps manufacturing specific status values
    + * into PMBus standard status values.
    + * This function is optional and only necessary if chip specific status
    + * register values have to be mapped into standard PMBus status register
    + * values.
    + */
    + int (*get_status)(struct i2c_client *client, int page, int reg);
    + /*
    + * The identify function determines supported PMBus functionality.
    + * This function is only necessary if a chip driver supports multiple
    + * chips, and the chip functionality is not pre-determined.
    + */
    + int (*identify)(struct i2c_client *client,
    + struct pmbus_driver_info *info);
    +};
    +
    +/* Function declarations */
    +
    +int pmbus_set_page(struct i2c_client *client, u8 page);
    +int pmbus_read_word_data(struct i2c_client *client, u8 page, u8 reg);
    +void pmbus_clear_faults(struct i2c_client *client);
    +bool pmbus_check_byte_register(struct i2c_client *client, int page, int reg);
    +bool pmbus_check_word_register(struct i2c_client *client, int page, int reg);
    +int pmbus_do_probe(struct i2c_client *client, const struct i2c_device_id *id,
    + struct pmbus_driver_info *info);
    +int pmbus_do_remove(struct i2c_client *client);
    +const struct pmbus_driver_info *pmbus_get_driver_info(struct i2c_client
    + *client);
    +
    +#endif /* PMBUS_H */
    diff --git a/drivers/hwmon/pmbus_core.c b/drivers/hwmon/pmbus_core.c
    new file mode 100644
    index 0000000..0edab1c
    --- /dev/null
    +++ b/drivers/hwmon/pmbus_core.c
    @@ -0,0 +1,1628 @@
    +/*
    + * Hardware monitoring driver for PMBus devices
    + *
    + * Copyright (c) 2010, 2011 Ericsson AB.
    + *
    + * This program is free software; you can redistribute it and/or modify
    + * it under the terms of the GNU General Public License as published by
    + * the Free Software Foundation; either version 2 of the License, or
    + * (at your option) any later version.
    + *
    + * This program is distributed in the hope that it will be useful,
    + * but WITHOUT ANY WARRANTY; without even the implied warranty of
    + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
    + * GNU General Public License for more details.
    + *
    + * You should have received a copy of the GNU General Public License
    + * along with this program; if not, write to the Free Software
    + * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
    + */
    +
    +#include <linux/kernel.h>
    +#include <linux/module.h>
    +#include <linux/init.h>
    +#include <linux/err.h>
    +#include <linux/slab.h>
    +#include <linux/i2c.h>
    +#include <linux/hwmon.h>
    +#include <linux/hwmon-sysfs.h>
    +#include <linux/delay.h>
    +#include <linux/i2c/pmbus.h>
    +#include "pmbus.h"
    +
    +/*
    + * Constants needed to determine number of sensors, booleans, and labels.
    + */
    +#define PMBUS_MAX_INPUT_SENSORS 11 /* 6*volt, 3*curr, 2*power */
    +#define PMBUS_VOUT_SENSORS_PER_PAGE 5 /* input, min, max, lcrit,
    + crit */
    +#define PMBUS_IOUT_SENSORS_PER_PAGE 4 /* input, min, max, crit */
    +#define PMBUS_POUT_SENSORS_PER_PAGE 4 /* input, cap, max, crit */
    +#define PMBUS_MAX_SENSORS_PER_FAN 1 /* input */
    +#define PMBUS_MAX_SENSORS_PER_TEMP 5 /* input, min, max, lcrit,
    + crit */
    +
    +#define PMBUS_MAX_INPUT_BOOLEANS 7 /* v: min_alarm, max_alarm,
    + lcrit_alarm, crit_alarm;
    + c: alarm, crit_alarm;
    + p: crit_alarm */
    +#define PMBUS_VOUT_BOOLEANS_PER_PAGE 4 /* min_alarm, max_alarm,
    + lcrit_alarm, crit_alarm */
    +#define PMBUS_IOUT_BOOLEANS_PER_PAGE 3 /* alarm, lcrit_alarm,
    + crit_alarm */
    +#define PMBUS_POUT_BOOLEANS_PER_PAGE 2 /* alarm, crit_alarm */
    +#define PMBUS_MAX_BOOLEANS_PER_FAN 2 /* alarm, fault */
    +#define PMBUS_MAX_BOOLEANS_PER_TEMP 4 /* min_alarm, max_alarm,
    + lcrit_alarm, crit_alarm */
    +
    +#define PMBUS_MAX_INPUT_LABELS 4 /* vin, vcap, iin, pin */
    +
    +/*
    + * status, status_vout, status_iout, status_fans, and status_temp
    + * are paged. status_input and status_fan34 are unpaged.
    + * status_fan34 is a special case to handle a second set of fans
    + * on page 0.
    + */
    +#define PB_NUM_STATUS_REG (PMBUS_PAGES * 5 + 2)
    +
    +/*
    + * Index into status register array, per status register group
    + */
    +#define PB_STATUS_BASE 0
    +#define PB_STATUS_VOUT_BASE (PB_STATUS_BASE + PMBUS_PAGES)
    +#define PB_STATUS_IOUT_BASE (PB_STATUS_VOUT_BASE + PMBUS_PAGES)
    +#define PB_STATUS_FAN_BASE (PB_STATUS_IOUT_BASE + PMBUS_PAGES)
    +#define PB_STATUS_FAN34_BASE (PB_STATUS_FAN_BASE + PMBUS_PAGES)
    +#define PB_STATUS_INPUT_BASE (PB_STATUS_FAN34_BASE + 1)
    +#define PB_STATUS_TEMP_BASE (PB_STATUS_INPUT_BASE + 1)
    +
    +struct pmbus_sensor {
    + char name[I2C_NAME_SIZE]; /* sysfs sensor name */
    + struct sensor_device_attribute attribute;
    + u8 page; /* page number */
    + u8 reg; /* register */
    + enum pmbus_sensor_classes class; /* sensor class */
    + bool update; /* runtime sensor update needed */
    + int data; /* Sensor data.
    + Negative if there was a read error */
    +};
    +
    +struct pmbus_boolean {
    + char name[I2C_NAME_SIZE]; /* sysfs boolean name */
    + struct sensor_device_attribute attribute;
    +};
    +
    +struct pmbus_label {
    + char name[I2C_NAME_SIZE]; /* sysfs label name */
    + struct sensor_device_attribute attribute;
    + char label[I2C_NAME_SIZE]; /* label */
    +};
    +
    +struct pmbus_data {
    + struct device *hwmon_dev;
    +
    + u32 flags; /* from platform data */
    +
    + int exponent; /* linear mode: exponent for output voltages */
    +
    + const struct pmbus_driver_info *info;
    +
    + int max_attributes;
    + int num_attributes;
    + struct attribute **attributes;
    + struct attribute_group group;
    +
    + /*
    + * Sensors cover both sensor and limit registers.
    + */
    + int max_sensors;
    + int num_sensors;
    + struct pmbus_sensor *sensors;
    + /*
    + * Booleans are used for alarms.
    + * Values are determined from status registers.
    + */
    + int max_booleans;
    + int num_booleans;
    + struct pmbus_boolean *booleans;
    + /*
    + * Labels are used to map generic names (e.g., "in1")
    + * to PMBus specific names (e.g., "vin" or "vout1").
    + */
    + int max_labels;
    + int num_labels;
    + struct pmbus_label *labels;
    +
    + struct mutex update_lock;
    + bool valid;
    + unsigned long last_updated; /* in jiffies */
    +
    + /*
    + * A single status register covers multiple attributes,
    + * so we keep them all together.
    + */
    + u8 status_bits;
    + u8 status[PB_NUM_STATUS_REG];
    +
    + u8 currpage;
    +};
    +
    +int pmbus_set_page(struct i2c_client *client, u8 page)
    +{
    + struct pmbus_data *data = i2c_get_clientdata(client);
    + int rv = 0;
    + int newpage;
    +
    + if (page != data->currpage) {
    + rv = i2c_smbus_write_byte_data(client, PMBUS_PAGE, page);
    + newpage = i2c_smbus_read_byte_data(client, PMBUS_PAGE);
    + if (newpage != page)
    + rv = -EINVAL;
    + else
    + data->currpage = page;
    + }
    + return rv;
    +}
    +EXPORT_SYMBOL_GPL(pmbus_set_page);
    +
    +static int pmbus_write_byte(struct i2c_client *client, u8 page, u8 value)
    +{
    + int rv;
    +
    + rv = pmbus_set_page(client, page);
    + if (rv < 0)
    + return rv;
    +
    + return i2c_smbus_write_byte(client, value);
    +}
    +
    +static int pmbus_write_word_data(struct i2c_client *client, u8 page, u8 reg,
    + u16 word)
    +{
    + int rv;
    +
    + rv = pmbus_set_page(client, page);
    + if (rv < 0)
    + return rv;
    +
    + return i2c_smbus_write_word_data(client, reg, word);
    +}
    +
    +int pmbus_read_word_data(struct i2c_client *client, u8 page, u8 reg)
    +{
    + int rv;
    +
    + rv = pmbus_set_page(client, page);
    + if (rv < 0)
    + return rv;
    +
    + return i2c_smbus_read_word_data(client, reg);
    +}
    +EXPORT_SYMBOL_GPL(pmbus_read_word_data);
    +
    +static int pmbus_read_byte_data(struct i2c_client *client, u8 page, u8 reg)
    +{
    + int rv;
    +
    + rv = pmbus_set_page(client, page);
    + if (rv < 0)
    + return rv;
    +
    + return i2c_smbus_read_byte_data(client, reg);
    +}
    +
    +static void pmbus_clear_fault_page(struct i2c_client *client, int page)
    +{
    + pmbus_write_byte(client, page, PMBUS_CLEAR_FAULTS);
    +}
    +
    +void pmbus_clear_faults(struct i2c_client *client)
    +{
    + struct pmbus_data *data = i2c_get_clientdata(client);
    + int i;
    +
    + for (i = 0; i < data->info->pages; i++)
    + pmbus_clear_fault_page(client, i);
    +}
    +EXPORT_SYMBOL_GPL(pmbus_clear_faults);
    +
    +static int pmbus_check_status_cml(struct i2c_client *client, int page)
    +{
    + int status, status2;
    +
    + status = pmbus_read_byte_data(client, page, PMBUS_STATUS_BYTE);
    + if (status < 0 || (status & PB_STATUS_CML)) {
    + status2 = pmbus_read_byte_data(client, page, PMBUS_STATUS_CML);
    + if (status2 < 0 || (status2 & PB_CML_FAULT_INVALID_COMMAND))
    + return -EINVAL;
    + }
    + return 0;
    +}
    +
    +bool pmbus_check_byte_register(struct i2c_client *client, int page, int reg)
    +{
    + int rv;
    + struct pmbus_data *data = i2c_get_clientdata(client);
    +
    + rv = pmbus_read_byte_data(client, page, reg);
    + if (rv >= 0 && !(data->flags & PMBUS_SKIP_STATUS_CHECK))
    + rv = pmbus_check_status_cml(client, page);
    + pmbus_clear_fault_page(client, page);
    + return rv >= 0;
    +}
    +EXPORT_SYMBOL_GPL(pmbus_check_byte_register);
    +
    +bool pmbus_check_word_register(struct i2c_client *client, int page, int reg)
    +{
    + int rv;
    + struct pmbus_data *data = i2c_get_clientdata(client);
    +
    + rv = pmbus_read_word_data(client, page, reg);
    + if (rv >= 0 && !(data->flags & PMBUS_SKIP_STATUS_CHECK))
    + rv = pmbus_check_status_cml(client, page);
    + pmbus_clear_fault_page(client, page);
    + return rv >= 0;
    +}
    +EXPORT_SYMBOL_GPL(pmbus_check_word_register);
    +
    +const struct pmbus_driver_info *pmbus_get_driver_info(struct i2c_client *client)
    +{
    + struct pmbus_data *data = i2c_get_clientdata(client);
    +
    + return data->info;
    +}
    +EXPORT_SYMBOL_GPL(pmbus_get_driver_info);
    +
    +static int pmbus_get_status(struct i2c_client *client, int page, int reg)
    +{
    + struct pmbus_data *data = i2c_get_clientdata(client);
    + const struct pmbus_driver_info *info = data->info;
    + int status;
    +
    + if (info->get_status) {
    + status = info->get_status(client, page, reg);
    + if (status != -ENODATA)
    + return status;
    + }
    + return pmbus_read_byte_data(client, page, reg);
    +}
    +
    +static struct pmbus_data *pmbus_update_device(struct device *dev)
    +{
    + struct i2c_client *client = to_i2c_client(dev);
    + struct pmbus_data *data = i2c_get_clientdata(client);
    + const struct pmbus_driver_info *info = data->info;
    +
    + mutex_lock(&data->update_lock);
    + if (time_after(jiffies, data->last_updated + HZ) || !data->valid) {
    + int i;
    +
    + for (i = 0; i < info->pages; i++)
    + data->status[PB_STATUS_BASE + i]
    + = pmbus_read_byte_data(client, i,
    + PMBUS_STATUS_BYTE);
    + for (i = 0; i < info->pages; i++) {
    + if (!(info->func[i] & PMBUS_HAVE_STATUS_VOUT))
    + continue;
    + data->status[PB_STATUS_VOUT_BASE + i]
    + = pmbus_get_status(client, i, PMBUS_STATUS_VOUT);
    + }
    + for (i = 0; i < info->pages; i++) {
    + if (!(info->func[i] & PMBUS_HAVE_STATUS_IOUT))
    + continue;
    + data->status[PB_STATUS_IOUT_BASE + i]
    + = pmbus_get_status(client, i, PMBUS_STATUS_IOUT);
    + }
    + for (i = 0; i < info->pages; i++) {
    + if (!(info->func[i] & PMBUS_HAVE_STATUS_TEMP))
    + continue;
    + data->status[PB_STATUS_TEMP_BASE + i]
    + = pmbus_get_status(client, i,
    + PMBUS_STATUS_TEMPERATURE);
    + }
    + for (i = 0; i < info->pages; i++) {
    + if (!(info->func[i] & PMBUS_HAVE_STATUS_FAN12))
    + continue;
    + data->status[PB_STATUS_FAN_BASE + i]
    + = pmbus_get_status(client, i, PMBUS_STATUS_FAN_12);
    + }
    +
    + if (info->func[0] & PMBUS_HAVE_STATUS_INPUT)
    + data->status[PB_STATUS_INPUT_BASE]
    + = pmbus_get_status(client, 0, PMBUS_STATUS_INPUT);
    +
    + if (info->func[0] & PMBUS_HAVE_STATUS_FAN34)
    + data->status[PB_STATUS_FAN34_BASE]
    + = pmbus_get_status(client, 0, PMBUS_STATUS_FAN_34);
    +
    + for (i = 0; i < data->num_sensors; i++) {
    + struct pmbus_sensor *sensor = &data->sensors[i];
    +
    + if (!data->valid || sensor->update)
    + sensor->data
    + = pmbus_read_word_data(client, sensor->page,
    + sensor->reg);
    + }
    + pmbus_clear_faults(client);
    + data->last_updated = jiffies;
    + data->valid = 1;
    + }
    + mutex_unlock(&data->update_lock);
    + return data;
    +}
    +
    +/*
    + * Convert linear sensor values to milli- or micro-units
    + * depending on sensor type.
    + */
    +static int pmbus_reg2data_linear(struct pmbus_data *data,
    + struct pmbus_sensor *sensor)
    +{
    + s16 exponent, mantissa;
    + long val;
    +
    + if (sensor->class == PSC_VOLTAGE_OUT) {
    + exponent = data->exponent;
    + mantissa = (s16) sensor->data;
    + } else {
    + exponent = (sensor->data >> 11) & 0x001f;
    + mantissa = sensor->data & 0x07ff;
    +
    + if (exponent > 0x0f)
    + exponent |= 0xffe0; /* sign extend exponent */
    + if (mantissa > 0x03ff)
    + mantissa |= 0xf800; /* sign extend mantissa */
    + }
    +
    + val = mantissa;
    +
    + /* scale result to milli-units for all sensors except fans */
    + if (sensor->class != PSC_FAN)
    + val = val * 1000L;
    +
    + /* scale result to micro-units for power sensors */
    + if (sensor->class == PSC_POWER)
    + val = val * 1000L;
    +
    + if (exponent >= 0)
    + val <<= exponent;
    + else
    + val >>= -exponent;
    +
    + return (int)val;
    +}
    +
    +/*
    + * Convert direct sensor values to milli- or micro-units
    + * depending on sensor type.
    + */
    +static int pmbus_reg2data_direct(struct pmbus_data *data,
    + struct pmbus_sensor *sensor)
    +{
    + long val = (s16) sensor->data;
    + long m, b, R;
    +
    + m = data->info->m[sensor->class];
    + b = data->info->b[sensor->class];
    + R = data->info->R[sensor->class];
    +
    + if (m == 0)
    + return 0;
    +
    + /* X = 1/m * (Y * 10^-R - b) */
    + R = -R;
    + /* scale result to milli-units for everything but fans */
    + if (sensor->class != PSC_FAN) {
    + R += 3;
    + b *= 1000;
    + }
    +
    + /* scale result to micro-units for power sensors */
    + if (sensor->class == PSC_POWER) {
    + R += 3;
    + b *= 1000;
    + }
    +
    + while (R > 0) {
    + val *= 10;
    + R--;
    + }
    + while (R < 0) {
    + val = DIV_ROUND_CLOSEST(val, 10);
    + R++;
    + }
    +
    + return (int)((val - b) / m);
    +}
    +
    +static int pmbus_reg2data(struct pmbus_data *data, struct pmbus_sensor *sensor)
    +{
    + int val;
    +
    + if (data->info->direct[sensor->class])
    + val = pmbus_reg2data_direct(data, sensor);
    + else
    + val = pmbus_reg2data_linear(data, sensor);
    +
    + return val;
    +}
    +
    +#define MAX_MANTISSA (1023 * 1000)
    +#define MIN_MANTISSA (511 * 1000)
    +
    +static u16 pmbus_data2reg_linear(struct pmbus_data *data,
    + enum pmbus_sensor_classes class, long val)
    +{
    + s16 exponent = 0, mantissa = 0;
    + bool negative = false;
    +
    + /* simple case */
    + if (val == 0)
    + return 0;
    +
    + if (val < 0) {
    + negative = true;
    + val = -val;
    + }
    +
    + if (class == PSC_VOLTAGE_OUT) {
    + /*
    + * For a static exponents, we don't have a choice
    + * but to adjust the value to it.
    + */
    + if (data->exponent < 0)
    + val <<= -data->exponent;
    + else
    + val >>= data->exponent;
    + val = DIV_ROUND_CLOSEST(val, 1000);
    + if (val > 0x7fff)
    + val = 0x7fff;
    + return negative ? -val : val;
    + }
    +
    + /* Power is in uW. Convert to mW before converting. */
    + if (class == PSC_POWER)
    + val = DIV_ROUND_CLOSEST(val, 1000L);
    +
    + /*
    + * For simplicity, convert fan data to milli-units
    + * before calculating the exponent.
    + */
    + if (class == PSC_FAN)
    + val = val * 1000;
    +
    + /* Reduce large mantissa until it fits into 10 bit */
    + while (val >= MAX_MANTISSA && exponent < 15) {
    + exponent++;
    + val >>= 1;
    + }
    + /* Increase small mantissa to improve precision */
    + while (val < MIN_MANTISSA && exponent > -15) {
    + exponent--;
    + val <<= 1;
    + }
    +
    + /* Convert mantissa from milli-units to units */
    + mantissa = DIV_ROUND_CLOSEST(val, 1000);
    +
    + /* Ensure that resulting number is within range */
    + if (mantissa > 0x3ff)
    + mantissa = 0x3ff;
    +
    + /* restore sign */
    + if (negative)
    + mantissa = -mantissa;
    +
    + /* Convert to 5 bit exponent, 11 bit mantissa */
    + return (mantissa & 0x7ff) | ((exponent << 11) & 0xf800);
    +}
    +
    +static u16 pmbus_data2reg_direct(struct pmbus_data *data,
    + enum pmbus_sensor_classes class, long val)
    +{
    + long m, b, R;
    +
    + m = data->info->m[class];
    + b = data->info->b[class];
    + R = data->info->R[class];
    +
    + /* Power is in uW. Adjust R and b. */
    + if (class == PSC_POWER) {
    + R -= 3;
    + b *= 1000;
    + }
    +
    + /* Calculate Y = (m * X + b) * 10^R */
    + if (class != PSC_FAN) {
    + R -= 3; /* Adjust R and b for data in milli-units */
    + b *= 1000;
    + }
    + val = val * m + b;
    +
    + while (R > 0) {
    + val *= 10;
    + R--;
    + }
    + while (R < 0) {
    + val = DIV_ROUND_CLOSEST(val, 10);
    + R++;
    + }
    +
    + return val;
    +}
    +
    +static u16 pmbus_data2reg(struct pmbus_data *data,
    + enum pmbus_sensor_classes class, long val)
    +{
    + u16 regval;
    +
    + if (data->info->direct[class])
    + regval = pmbus_data2reg_direct(data, class, val);
    + else
    + regval = pmbus_data2reg_linear(data, class, val);
    +
    + return regval;
    +}
    +
    +/*
    + * Return boolean calculated from converted data.
    + * <index> defines a status register index and mask, and optionally
    + * two sensor indexes.
    + * The upper half-word references the two sensors,
    + * two sensor indices.
    + * The upper half-word references the two optional sensors,
    + * the lower half word references status register and mask.
    + * The function returns true if (status[reg] & mask) is true and,
    + * if specified, if v1 >= v2.
    + * To determine if an object exceeds upper limits, specify <v, limit>.
    + * To determine if an object exceeds lower limits, specify <limit, v>.
    + *
    + * For booleans created with pmbus_add_boolean_reg(), only the lower 16 bits of
    + * index are set. s1 and s2 (the sensor index values) are zero in this case.
    + * The function returns true if (status[reg] & mask) is true.
    + *
    + * If the boolean was created with pmbus_add_boolean_cmp(), a comparison against
    + * a specified limit has to be performed to determine the boolean result.
    + * In this case, the function returns true if v1 >= v2 (where v1 and v2 are
    + * sensor values referenced by sensor indices s1 and s2).
    + *
    + * To determine if an object exceeds upper limits, specify <s1,s2> = <v,limit>.
    + * To determine if an object exceeds lower limits, specify <s1,s2> = <limit,v>.
    + *
    + * If a negative value is stored in any of the referenced registers, this value
    + * reflects an error code which will be returned.
    + */
    +static int pmbus_get_boolean(struct pmbus_data *data, int index, int *val)
    +{
    + u8 s1 = (index >> 24) & 0xff;
    + u8 s2 = (index >> 16) & 0xff;
    + u8 reg = (index >> 8) & 0xff;
    + u8 mask = index & 0xff;
    + int status;
    + u8 regval;
    +
    + status = data->status[reg];
    + if (status < 0)
    + return status;
    +
    + regval = status & mask;
    + if (!s1 && !s2)
    + *val = !!regval;
    + else {
    + int v1, v2;
    + struct pmbus_sensor *sensor1, *sensor2;
    +
    + sensor1 = &data->sensors[s1];
    + if (sensor1->data < 0)
    + return sensor1->data;
    + sensor2 = &data->sensors[s2];
    + if (sensor2->data < 0)
    + return sensor2->data;
    +
    + v1 = pmbus_reg2data(data, sensor1);
    + v2 = pmbus_reg2data(data, sensor2);
    + *val = !!(regval && v1 >= v2);
    + }
    + return 0;
    +}
    +
    +static ssize_t pmbus_show_boolean(struct device *dev,
    + struct device_attribute *da, char *buf)
    +{
    + struct sensor_device_attribute *attr = to_sensor_dev_attr(da);
    + struct pmbus_data *data = pmbus_update_device(dev);
    + int val;
    + int err;
    +
    + err = pmbus_get_boolean(data, attr->index, &val);
    + if (err)
    + return err;
    + return snprintf(buf, PAGE_SIZE, "%d\n", val);
    +}
    +
    +static ssize_t pmbus_show_sensor(struct device *dev,
    + struct device_attribute *da, char *buf)
    +{
    + struct sensor_device_attribute *attr = to_sensor_dev_attr(da);
    + struct pmbus_data *data = pmbus_update_device(dev);
    + struct pmbus_sensor *sensor;
    +
    + sensor = &data->sensors[attr->index];
    + if (sensor->data < 0)
    + return sensor->data;
    +
    + return snprintf(buf, PAGE_SIZE, "%d\n", pmbus_reg2data(data, sensor));
    +}
    +
    +static ssize_t pmbus_set_sensor(struct device *dev,
    + struct device_attribute *devattr,
    + const char *buf, size_t count)
    +{
    + struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
    + struct i2c_client *client = to_i2c_client(dev);
    + struct pmbus_data *data = i2c_get_clientdata(client);
    + struct pmbus_sensor *sensor = &data->sensors[attr->index];
    + ssize_t rv = count;
    + long val = 0;
    + int ret;
    + u16 regval;
    +
    + if (strict_strtol(buf, 10, &val) < 0)
    + return -EINVAL;
    +
    + mutex_lock(&data->update_lock);
    + regval = pmbus_data2reg(data, sensor->class, val);
    + ret = pmbus_write_word_data(client, sensor->page, sensor->reg, regval);
    + if (ret < 0)
    + rv = ret;
    + else
    + data->sensors[attr->index].data = regval;
    + mutex_unlock(&data->update_lock);
    + return rv;
    +}
    +
    +static ssize_t pmbus_show_label(struct device *dev,
    + struct device_attribute *da, char *buf)
    +{
    + struct i2c_client *client = to_i2c_client(dev);
    + struct pmbus_data *data = i2c_get_clientdata(client);
    + struct sensor_device_attribute *attr = to_sensor_dev_attr(da);
    +
    + return snprintf(buf, PAGE_SIZE, "%s\n",
    + data->labels[attr->index].label);
    +}
    +
    +#define PMBUS_ADD_ATTR(data, _name, _idx, _mode, _type, _show, _set) \
    +do { \
    + struct sensor_device_attribute *a \
    + = &data->_type##s[data->num_##_type##s].attribute; \
    + BUG_ON(data->num_attributes >= data->max_attributes); \
    + a->dev_attr.attr.name = _name; \
    + a->dev_attr.attr.mode = _mode; \
    + a->dev_attr.show = _show; \
    + a->dev_attr.store = _set; \
    + a->index = _idx; \
    + data->attributes[data->num_attributes] = &a->dev_attr.attr; \
    + data->num_attributes++; \
    +} while (0)
    +
    +#define PMBUS_ADD_GET_ATTR(data, _name, _type, _idx) \
    + PMBUS_ADD_ATTR(data, _name, _idx, S_IRUGO, _type, \
    + pmbus_show_##_type, NULL)
    +
    +#define PMBUS_ADD_SET_ATTR(data, _name, _type, _idx) \
    + PMBUS_ADD_ATTR(data, _name, _idx, S_IWUSR | S_IRUGO, _type, \
    + pmbus_show_##_type, pmbus_set_##_type)
    +
    +static void pmbus_add_boolean(struct pmbus_data *data,
    + const char *name, const char *type, int seq,
    + int idx)
    +{
    + struct pmbus_boolean *boolean;
    +
    + BUG_ON(data->num_booleans >= data->max_booleans);
    +
    + boolean = &data->booleans[data->num_booleans];
    +
    + snprintf(boolean->name, sizeof(boolean->name), "%s%d_%s",
    + name, seq, type);
    + PMBUS_ADD_GET_ATTR(data, boolean->name, boolean, idx);
    + data->num_booleans++;
    +}
    +
    +static void pmbus_add_boolean_reg(struct pmbus_data *data,
    + const char *name, const char *type,
    + int seq, int reg, int bit)
    +{
    + pmbus_add_boolean(data, name, type, seq, (reg << 8) | bit);
    +}
    +
    +static void pmbus_add_boolean_cmp(struct pmbus_data *data,
    + const char *name, const char *type,
    + int seq, int i1, int i2, int reg, int mask)
    +{
    + pmbus_add_boolean(data, name, type, seq,
    + (i1 << 24) | (i2 << 16) | (reg << 8) | mask);
    +}
    +
    +static void pmbus_add_sensor(struct pmbus_data *data,
    + const char *name, const char *type, int seq,
    + int page, int reg, enum pmbus_sensor_classes class,
    + bool update)
    +{
    + struct pmbus_sensor *sensor;
    +
    + BUG_ON(data->num_sensors >= data->max_sensors);
    +
    + sensor = &data->sensors[data->num_sensors];
    + snprintf(sensor->name, sizeof(sensor->name), "%s%d_%s",
    + name, seq, type);
    + sensor->page = page;
    + sensor->reg = reg;
    + sensor->class = class;
    + sensor->update = update;
    + if (update)
    + PMBUS_ADD_GET_ATTR(data, sensor->name, sensor,
    + data->num_sensors);
    + else
    + PMBUS_ADD_SET_ATTR(data, sensor->name, sensor,
    + data->num_sensors);
    + data->num_sensors++;
    +}
    +
    +static void pmbus_add_label(struct pmbus_data *data,
    + const char *name, int seq,
    + const char *lstring, int index)
    +{
    + struct pmbus_label *label;
    +
    + BUG_ON(data->num_labels >= data->max_labels);
    +
    + label = &data->labels[data->num_labels];
    + snprintf(label->name, sizeof(label->name), "%s%d_label", name, seq);
    + if (!index)
    + strncpy(label->label, lstring, sizeof(label->label) - 1);
    + else
    + snprintf(label->label, sizeof(label->label), "%s%d", lstring,
    + index);
    +
    + PMBUS_ADD_GET_ATTR(data, label->name, label, data->num_labels);
    + data->num_labels++;
    +}
    +
    +static const int pmbus_temp_registers[] = {
    + PMBUS_READ_TEMPERATURE_1,
    + PMBUS_READ_TEMPERATURE_2,
    + PMBUS_READ_TEMPERATURE_3
    +};
    +
    +static const int pmbus_fan_registers[] = {
    + PMBUS_READ_FAN_SPEED_1,
    + PMBUS_READ_FAN_SPEED_2,
    + PMBUS_READ_FAN_SPEED_3,
    + PMBUS_READ_FAN_SPEED_4
    +};
    +
    +static const int pmbus_fan_config_registers[] = {
    + PMBUS_FAN_CONFIG_12,
    + PMBUS_FAN_CONFIG_12,
    + PMBUS_FAN_CONFIG_34,
    + PMBUS_FAN_CONFIG_34
    +};
    +
    +static const int pmbus_fan_status_registers[] = {
    + PMBUS_STATUS_FAN_12,
    + PMBUS_STATUS_FAN_12,
    + PMBUS_STATUS_FAN_34,
    + PMBUS_STATUS_FAN_34
    +};
    +
    +/*
    + * Determine maximum number of sensors, booleans, and labels.
    + * To keep things simple, only make a rough high estimate.
    + */
    +static void pmbus_find_max_attr(struct i2c_client *client,
    + struct pmbus_data *data)
    +{
    + const struct pmbus_driver_info *info = data->info;
    + int page, max_sensors, max_booleans, max_labels;
    +
    + max_sensors = PMBUS_MAX_INPUT_SENSORS;
    + max_booleans = PMBUS_MAX_INPUT_BOOLEANS;
    + max_labels = PMBUS_MAX_INPUT_LABELS;
    +
    + for (page = 0; page < info->pages; page++) {
    + if (info->func[page] & PMBUS_HAVE_VOUT) {
    + max_sensors += PMBUS_VOUT_SENSORS_PER_PAGE;
    + max_booleans += PMBUS_VOUT_BOOLEANS_PER_PAGE;
    + max_labels++;
    + }
    + if (info->func[page] & PMBUS_HAVE_IOUT) {
    + max_sensors += PMBUS_IOUT_SENSORS_PER_PAGE;
    + max_booleans += PMBUS_IOUT_BOOLEANS_PER_PAGE;
    + max_labels++;
    + }
    + if (info->func[page] & PMBUS_HAVE_POUT) {
    + max_sensors += PMBUS_POUT_SENSORS_PER_PAGE;
    + max_booleans += PMBUS_POUT_BOOLEANS_PER_PAGE;
    + max_labels++;
    + }
    + if (info->func[page] & PMBUS_HAVE_FAN12) {
    + if (page == 0) {
    + max_sensors +=
    + ARRAY_SIZE(pmbus_fan_registers) *
    + PMBUS_MAX_SENSORS_PER_FAN;
    + max_booleans +=
    + ARRAY_SIZE(pmbus_fan_registers) *
    + PMBUS_MAX_BOOLEANS_PER_FAN;
    + } else {
    + max_sensors += PMBUS_MAX_SENSORS_PER_FAN;
    + max_booleans += PMBUS_MAX_BOOLEANS_PER_FAN;
    + }
    + }
    + if (info->func[page] & PMBUS_HAVE_TEMP) {
    + if (page == 0) {
    + max_sensors +=
    + ARRAY_SIZE(pmbus_temp_registers) *
    + PMBUS_MAX_SENSORS_PER_TEMP;
    + max_booleans +=
    + ARRAY_SIZE(pmbus_temp_registers) *
    + PMBUS_MAX_BOOLEANS_PER_TEMP;
    + } else {
    + max_sensors += PMBUS_MAX_SENSORS_PER_TEMP;
    + max_booleans += PMBUS_MAX_BOOLEANS_PER_TEMP;
    + }
    + }
    + }
    + data->max_sensors = max_sensors;
    + data->max_booleans = max_booleans;
    + data->max_labels = max_labels;
    + data->max_attributes = max_sensors + max_booleans + max_labels;
    +}
    +
    +/*
    + * Search for attributes. Allocate sensors, booleans, and labels as needed.
    + */
    +static void pmbus_find_attributes(struct i2c_client *client,
    + struct pmbus_data *data)
    +{
    + const struct pmbus_driver_info *info = data->info;
    + int page, i0, i1, in_index;
    +
    + /*
    + * Input voltage sensors
    + */
    + in_index = 1;
    + if (info->func[0] & PMBUS_HAVE_VIN) {
    + bool have_alarm = false;
    +
    + i0 = data->num_sensors;
    + pmbus_add_label(data, "in", in_index, "vin", 0);
    + pmbus_add_sensor(data, "in", "input", in_index,
    + 0, PMBUS_READ_VIN, PSC_VOLTAGE_IN, true);
    + if (pmbus_check_word_register(client, 0,
    + PMBUS_VIN_UV_WARN_LIMIT)) {
    + i1 = data->num_sensors;
    + pmbus_add_sensor(data, "in", "min", in_index,
    + 0, PMBUS_VIN_UV_WARN_LIMIT,
    + PSC_VOLTAGE_IN, false);
    + if (info->func[0] & PMBUS_HAVE_STATUS_INPUT) {
    + pmbus_add_boolean_reg(data, "in", "min_alarm",
    + in_index,
    + PB_STATUS_INPUT_BASE,
    + PB_VOLTAGE_UV_WARNING);
    + have_alarm = true;
    + }
    + }
    + if (pmbus_check_word_register(client, 0,
    + PMBUS_VIN_UV_FAULT_LIMIT)) {
    + i1 = data->num_sensors;
    + pmbus_add_sensor(data, "in", "lcrit", in_index,
    + 0, PMBUS_VIN_UV_FAULT_LIMIT,
    + PSC_VOLTAGE_IN, false);
    + if (info->func[0] & PMBUS_HAVE_STATUS_INPUT) {
    + pmbus_add_boolean_reg(data, "in", "lcrit_alarm",
    + in_index,
    + PB_STATUS_INPUT_BASE,
    + PB_VOLTAGE_UV_FAULT);
    + have_alarm = true;
    + }
    + }
    + if (pmbus_check_word_register(client, 0,
    + PMBUS_VIN_OV_WARN_LIMIT)) {
    + i1 = data->num_sensors;
    + pmbus_add_sensor(data, "in", "max", in_index,
    + 0, PMBUS_VIN_OV_WARN_LIMIT,
    + PSC_VOLTAGE_IN, false);
    + if (info->func[0] & PMBUS_HAVE_STATUS_INPUT) {
    + pmbus_add_boolean_reg(data, "in", "max_alarm",
    + in_index,
    + PB_STATUS_INPUT_BASE,
    + PB_VOLTAGE_OV_WARNING);
    + have_alarm = true;
    + }
    + }
    + if (pmbus_check_word_register(client, 0,
    + PMBUS_VIN_OV_FAULT_LIMIT)) {
    + i1 = data->num_sensors;
    + pmbus_add_sensor(data, "in", "crit", in_index,
    + 0, PMBUS_VIN_OV_FAULT_LIMIT,
    + PSC_VOLTAGE_IN, false);
    + if (info->func[0] & PMBUS_HAVE_STATUS_INPUT) {
    + pmbus_add_boolean_reg(data, "in", "crit_alarm",
    + in_index,
    + PB_STATUS_INPUT_BASE,
    + PB_VOLTAGE_OV_FAULT);
    + have_alarm = true;
    + }
    + }
    + /*
    + * Add generic alarm attribute only if there are no individual
    + * attributes.
    + */
    + if (!have_alarm)
    + pmbus_add_boolean_reg(data, "in", "alarm",
    + in_index,
    + PB_STATUS_BASE,
    + PB_STATUS_VIN_UV);
    + in_index++;
    + }
    + if (info->func[0] & PMBUS_HAVE_VCAP) {
    + pmbus_add_label(data, "in", in_index, "vcap", 0);
    + pmbus_add_sensor(data, "in", "input", in_index, 0,
    + PMBUS_READ_VCAP, PSC_VOLTAGE_IN, true);
    + in_index++;
    + }
    +
    + /*
    + * Output voltage sensors
    + */
    + for (page = 0; page < info->pages; page++) {
    + bool have_alarm = false;
    +
    + if (!(info->func[page] & PMBUS_HAVE_VOUT))
    + continue;
    +
    + i0 = data->num_sensors;
    + pmbus_add_label(data, "in", in_index, "vout", page + 1);
    + pmbus_add_sensor(data, "in", "input", in_index, page,
    + PMBUS_READ_VOUT, PSC_VOLTAGE_OUT, true);
    + if (pmbus_check_word_register(client, page,
    + PMBUS_VOUT_UV_WARN_LIMIT)) {
    + i1 = data->num_sensors;
    + pmbus_add_sensor(data, "in", "min", in_index, page,
    + PMBUS_VOUT_UV_WARN_LIMIT,
    + PSC_VOLTAGE_OUT, false);
    + if (info->func[page] & PMBUS_HAVE_STATUS_VOUT) {
    + pmbus_add_boolean_reg(data, "in", "min_alarm",
    + in_index,
    + PB_STATUS_VOUT_BASE +
    + page,
    + PB_VOLTAGE_UV_WARNING);
    + have_alarm = true;
    + }
    + }
    + if (pmbus_check_word_register(client, page,
    + PMBUS_VOUT_UV_FAULT_LIMIT)) {
    + i1 = data->num_sensors;
    + pmbus_add_sensor(data, "in", "lcrit", in_index, page,
    + PMBUS_VOUT_UV_FAULT_LIMIT,
    + PSC_VOLTAGE_OUT, false);
    + if (info->func[page] & PMBUS_HAVE_STATUS_VOUT) {
    + pmbus_add_boolean_reg(data, "in", "lcrit_alarm",
    + in_index,
    + PB_STATUS_VOUT_BASE +
    + page,
    + PB_VOLTAGE_UV_FAULT);
    + have_alarm = true;
    + }
    + }
    + if (pmbus_check_word_register(client, page,
    + PMBUS_VOUT_OV_WARN_LIMIT)) {
    + i1 = data->num_sensors;
    + pmbus_add_sensor(data, "in", "max", in_index, page,
    + PMBUS_VOUT_OV_WARN_LIMIT,
    + PSC_VOLTAGE_OUT, false);
    + if (info->func[page] & PMBUS_HAVE_STATUS_VOUT) {
    + pmbus_add_boolean_reg(data, "in", "max_alarm",
    + in_index,
    + PB_STATUS_VOUT_BASE +
    + page,
    + PB_VOLTAGE_OV_WARNING);
    + have_alarm = true;
    + }
    + }
    + if (pmbus_check_word_register(client, page,
    + PMBUS_VOUT_OV_FAULT_LIMIT)) {
    + i1 = data->num_sensors;
    + pmbus_add_sensor(data, "in", "crit", in_index, page,
    + PMBUS_VOUT_OV_FAULT_LIMIT,
    + PSC_VOLTAGE_OUT, false);
    + if (info->func[page] & PMBUS_HAVE_STATUS_VOUT) {
    + pmbus_add_boolean_reg(data, "in", "crit_alarm",
    + in_index,
    + PB_STATUS_VOUT_BASE +
    + page,
    + PB_VOLTAGE_OV_FAULT);
    + have_alarm = true;
    + }
    + }
    + /*
    + * Add generic alarm attribute only if there are no individual
    + * attributes.
    + */
    + if (!have_alarm)
    + pmbus_add_boolean_reg(data, "in", "alarm",
    + in_index,
    + PB_STATUS_BASE + page,
    + PB_STATUS_VOUT_OV);
    + in_index++;
    + }
    +
    + /*
    + * Current sensors
    + */
    +
    + /*
    + * Input current sensors
    + */
    + in_index = 1;
    + if (info->func[0] & PMBUS_HAVE_IIN) {
    + i0 = data->num_sensors;
    + pmbus_add_label(data, "curr", in_index, "iin", 0);
    + pmbus_add_sensor(data, "curr", "input", in_index,
    + 0, PMBUS_READ_IIN, PSC_CURRENT_IN, true);
    + if (pmbus_check_word_register(client, 0,
    + PMBUS_IIN_OC_WARN_LIMIT)) {
    + i1 = data->num_sensors;
    + pmbus_add_sensor(data, "curr", "max", in_index,
    + 0, PMBUS_IIN_OC_WARN_LIMIT,
    + PSC_CURRENT_IN, false);
    + if (info->func[0] & PMBUS_HAVE_STATUS_INPUT) {
    + pmbus_add_boolean_reg(data, "curr", "max_alarm",
    + in_index,
    + PB_STATUS_INPUT_BASE,
    + PB_IIN_OC_WARNING);
    + }
    + }
    + if (pmbus_check_word_register(client, 0,
    + PMBUS_IIN_OC_FAULT_LIMIT)) {
    + i1 = data->num_sensors;
    + pmbus_add_sensor(data, "curr", "crit", in_index,
    + 0, PMBUS_IIN_OC_FAULT_LIMIT,
    + PSC_CURRENT_IN, false);
    + if (info->func[0] & PMBUS_HAVE_STATUS_INPUT)
    + pmbus_add_boolean_reg(data, "curr",
    + "crit_alarm",
    + in_index,
    + PB_STATUS_INPUT_BASE,
    + PB_IIN_OC_FAULT);
    + }
    + in_index++;
    + }
    +
    + /*
    + * Output current sensors
    + */
    + for (page = 0; page < info->pages; page++) {
    + bool have_alarm = false;
    +
    + if (!(info->func[page] & PMBUS_HAVE_IOUT))
    + continue;
    +
    + i0 = data->num_sensors;
    + pmbus_add_label(data, "curr", in_index, "iout", page + 1);
    + pmbus_add_sensor(data, "curr", "input", in_index, page,
    + PMBUS_READ_IOUT, PSC_CURRENT_OUT, true);
    + if (pmbus_check_word_register(client, page,
    + PMBUS_IOUT_OC_WARN_LIMIT)) {
    + i1 = data->num_sensors;
    + pmbus_add_sensor(data, "curr", "max", in_index, page,
    + PMBUS_IOUT_OC_WARN_LIMIT,
    + PSC_CURRENT_OUT, false);
    + if (info->func[page] & PMBUS_HAVE_STATUS_IOUT) {
    + pmbus_add_boolean_reg(data, "curr", "max_alarm",
    + in_index,
    + PB_STATUS_IOUT_BASE +
    + page, PB_IOUT_OC_WARNING);
    + have_alarm = true;
    + }
    + }
    + if (pmbus_check_word_register(client, page,
    + PMBUS_IOUT_UC_FAULT_LIMIT)) {
    + i1 = data->num_sensors;
    + pmbus_add_sensor(data, "curr", "lcrit", in_index, page,
    + PMBUS_IOUT_UC_FAULT_LIMIT,
    + PSC_CURRENT_OUT, false);
    + if (info->func[page] & PMBUS_HAVE_STATUS_IOUT) {
    + pmbus_add_boolean_reg(data, "curr",
    + "lcrit_alarm",
    + in_index,
    + PB_STATUS_IOUT_BASE +
    + page, PB_IOUT_UC_FAULT);
    + have_alarm = true;
    + }
    + }
    + if (pmbus_check_word_register(client, page,
    + PMBUS_IOUT_OC_FAULT_LIMIT)) {
    + i1 = data->num_sensors;
    + pmbus_add_sensor(data, "curr", "crit", in_index, page,
    + PMBUS_IOUT_OC_FAULT_LIMIT,
    + PSC_CURRENT_OUT, false);
    + if (info->func[page] & PMBUS_HAVE_STATUS_IOUT) {
    + pmbus_add_boolean_reg(data, "curr",
    + "crit_alarm",
    + in_index,
    + PB_STATUS_IOUT_BASE +
    + page, PB_IOUT_OC_FAULT);
    + have_alarm = true;
    + }
    + }
    + /*
    + * Add generic alarm attribute only if there are no individual
    + * attributes.
    + */
    + if (!have_alarm)
    + pmbus_add_boolean_reg(data, "curr", "alarm",
    + in_index,
    + PB_STATUS_BASE + page,
    + PB_STATUS_IOUT_OC);
    + in_index++;
    + }
    +
    + /*
    + * Power sensors
    + */
    + /*
    + * Input Power sensors
    + */
    + in_index = 1;
    + if (info->func[0] & PMBUS_HAVE_PIN) {
    + i0 = data->num_sensors;
    + pmbus_add_label(data, "power", in_index, "pin", 0);
    + pmbus_add_sensor(data, "power", "input", in_index,
    + 0, PMBUS_READ_PIN, PSC_POWER, true);
    + if (pmbus_check_word_register(client, 0,
    + PMBUS_PIN_OP_WARN_LIMIT)) {
    + i1 = data->num_sensors;
    + pmbus_add_sensor(data, "power", "max", in_index,
    + 0, PMBUS_PIN_OP_WARN_LIMIT, PSC_POWER,
    + false);
    + if (info->func[0] & PMBUS_HAVE_STATUS_INPUT)
    + pmbus_add_boolean_reg(data, "power",
    + "alarm",
    + in_index,
    + PB_STATUS_INPUT_BASE,
    + PB_PIN_OP_WARNING);
    + }
    + in_index++;
    + }
    +
    + /*
    + * Output Power sensors
    + */
    + for (page = 0; page < info->pages; page++) {
    + bool need_alarm = false;
    +
    + if (!(info->func[page] & PMBUS_HAVE_POUT))
    + continue;
    +
    + i0 = data->num_sensors;
    + pmbus_add_label(data, "power", in_index, "pout", page + 1);
    + pmbus_add_sensor(data, "power", "input", in_index, page,
    + PMBUS_READ_POUT, PSC_POWER, true);
    + /*
    + * Per hwmon sysfs API, power_cap is to be used to limit output
    + * power.
    + * We have two registers related to maximum output power,
    + * PMBUS_POUT_MAX and PMBUS_POUT_OP_WARN_LIMIT.
    + * PMBUS_POUT_MAX matches the powerX_cap attribute definition.
    + * There is no attribute in the API to match
    + * PMBUS_POUT_OP_WARN_LIMIT. We use powerX_max for now.
    + */
    + if (pmbus_check_word_register(client, page, PMBUS_POUT_MAX)) {
    + i1 = data->num_sensors;
    + pmbus_add_sensor(data, "power", "cap", in_index, page,
    + PMBUS_POUT_MAX, PSC_POWER, false);
    + need_alarm = true;
    + }
    + if (pmbus_check_word_register(client, page,
    + PMBUS_POUT_OP_WARN_LIMIT)) {
    + i1 = data->num_sensors;
    + pmbus_add_sensor(data, "power", "max", in_index, page,
    + PMBUS_POUT_OP_WARN_LIMIT, PSC_POWER,
    + false);
    + need_alarm = true;
    + }
    + if (need_alarm && (info->func[page] & PMBUS_HAVE_STATUS_IOUT))
    + pmbus_add_boolean_reg(data, "power", "alarm",
    + in_index,
    + PB_STATUS_IOUT_BASE + page,
    + PB_POUT_OP_WARNING
    + | PB_POWER_LIMITING);
    +
    + if (pmbus_check_word_register(client, page,
    + PMBUS_POUT_OP_FAULT_LIMIT)) {
    + i1 = data->num_sensors;
    + pmbus_add_sensor(data, "power", "crit", in_index, page,
    + PMBUS_POUT_OP_FAULT_LIMIT, PSC_POWER,
    + false);
    + if (info->func[page] & PMBUS_HAVE_STATUS_IOUT)
    + pmbus_add_boolean_reg(data, "power",
    + "crit_alarm",
    + in_index,
    + PB_STATUS_IOUT_BASE
    + + page,
    + PB_POUT_OP_FAULT);
    + }
    + in_index++;
    + }
    +
    + /*
    + * Temperature sensors
    + */
    + in_index = 1;
    + for (page = 0; page < info->pages; page++) {
    + int t, temps;
    +
    + if (!(info->func[page] & PMBUS_HAVE_TEMP))
    + continue;
    +
    + temps = page ? 1 : ARRAY_SIZE(pmbus_temp_registers);
    + for (t = 0; t < temps; t++) {
    + bool have_alarm = false;
    +
    + if (!pmbus_check_word_register
    + (client, page, pmbus_temp_registers[t]))
    + break;
    +
    + i0 = data->num_sensors;
    + pmbus_add_sensor(data, "temp", "input", in_index, page,
    + pmbus_temp_registers[t],
    + PSC_TEMPERATURE, true);
    +
    + /*
    + * PMBus provides only one status register for TEMP1-3.
    + * Thus, we can not use the status register to determine
    + * which of the three sensors actually caused an alarm.
    + * Always compare current temperature against the limit
    + * registers to determine alarm conditions for a
    + * specific sensor.
    + */
    + if (pmbus_check_word_register
    + (client, page, PMBUS_UT_WARN_LIMIT)) {
    + i1 = data->num_sensors;
    + pmbus_add_sensor(data, "temp", "min", in_index,
    + page, PMBUS_UT_WARN_LIMIT,
    + PSC_TEMPERATURE, false);
    + if (info->func[page] & PMBUS_HAVE_STATUS_TEMP) {
    + pmbus_add_boolean_cmp(data, "temp",
    + "min_alarm", in_index, i1, i0,
    + PB_STATUS_TEMP_BASE + page,
    + PB_TEMP_UT_WARNING);
    + have_alarm = true;
    + }
    + }
    + if (pmbus_check_word_register(client, page,
    + PMBUS_UT_FAULT_LIMIT)) {
    + i1 = data->num_sensors;
    + pmbus_add_sensor(data, "temp", "lcrit",
    + in_index, page,
    + PMBUS_UT_FAULT_LIMIT,
    + PSC_TEMPERATURE, false);
    + if (info->func[page] & PMBUS_HAVE_STATUS_TEMP) {
    + pmbus_add_boolean_cmp(data, "temp",
    + "lcrit_alarm", in_index, i1, i0,
    + PB_STATUS_TEMP_BASE + page,
    + PB_TEMP_UT_FAULT);
    + have_alarm = true;
    + }
    + }
    + if (pmbus_check_word_register
    + (client, page, PMBUS_OT_WARN_LIMIT)) {
    + i1 = data->num_sensors;
    + pmbus_add_sensor(data, "temp", "max", in_index,
    + page, PMBUS_OT_WARN_LIMIT,
    + PSC_TEMPERATURE, false);
    + if (info->func[page] & PMBUS_HAVE_STATUS_TEMP) {
    + pmbus_add_boolean_cmp(data, "temp",
    + "max_alarm", in_index, i0, i1,
    + PB_STATUS_TEMP_BASE + page,
    + PB_TEMP_OT_WARNING);
    + have_alarm = true;
    + }
    + }
    + if (pmbus_check_word_register(client, page,
    + PMBUS_OT_FAULT_LIMIT)) {
    + i1 = data->num_sensors;
    + pmbus_add_sensor(data, "temp", "crit", in_index,
    + page, PMBUS_OT_FAULT_LIMIT,
    + PSC_TEMPERATURE, false);
    + if (info->func[page] & PMBUS_HAVE_STATUS_TEMP) {
    + pmbus_add_boolean_cmp(data, "temp",
    + "crit_alarm", in_index, i0, i1,
    + PB_STATUS_TEMP_BASE + page,
    + PB_TEMP_OT_FAULT);
    + have_alarm = true;
    + }
    + }
    + /*
    + * Last resort - we were not able to create any alarm
    + * registers. Report alarm for all sensors using the
    + * status register temperature alarm bit.
    + */
    + if (!have_alarm)
    + pmbus_add_boolean_reg(data, "temp", "alarm",
    + in_index,
    + PB_STATUS_BASE + page,
    + PB_STATUS_TEMPERATURE);
    + in_index++;
    + }
    + }
    +
    + /*
    + * Fans
    + */
    + in_index = 1;
    + for (page = 0; page < info->pages; page++) {
    + int fans, f;
    +
    + if (!(info->func[page] & PMBUS_HAVE_FAN12))
    + continue;
    +
    + fans = page ? 1 : ARRAY_SIZE(pmbus_fan_registers);
    + for (f = 0; f < fans; f++) {
    + int regval;
    +
    + if (!pmbus_check_word_register(client, page,
    + pmbus_fan_registers[f])
    + || !pmbus_check_byte_register(client, page,
    + pmbus_fan_config_registers[f]))
    + break;
    +
    + /*
    + * Skip fan if not installed.
    + * Each fan configuration register covers multiple fans,
    + * so we have to do some magic.
    + */
    + regval = pmbus_read_byte_data(client, page,
    + pmbus_fan_config_registers[f]);
    + if (regval < 0 ||
    + (!(regval & (PB_FAN_1_INSTALLED >> ((f & 1) * 4)))))
    + continue;
    +
    + i0 = data->num_sensors;
    + pmbus_add_sensor(data, "fan", "input", in_index, page,
    + pmbus_fan_registers[f], PSC_FAN, true);
    +
    + /*
    + * Each fan status register covers multiple fans,
    + * so we have to do some magic.
    + */
    + if (pmbus_check_byte_register
    + (client, page, pmbus_fan_status_registers[f])) {
    + int base;
    +
    + if (f > 1) /* fan 3, 4 */
    + base = PB_STATUS_FAN34_BASE;
    + else
    + base = PB_STATUS_FAN_BASE + page;
    + pmbus_add_boolean_reg(data, "fan", "alarm",
    + in_index, base,
    + PB_FAN_FAN1_WARNING >> (f & 1));
    + pmbus_add_boolean_reg(data, "fan", "fault",
    + in_index, base,
    + PB_FAN_FAN1_FAULT >> (f & 1));
    + }
    + in_index++;
    + }
    + }
    +}
    +
    +/*
    + * Identify chip parameters.
    + * This function is called for all chips.
    + */
    +static int pmbus_identify_common(struct i2c_client *client,
    + struct pmbus_data *data)
    +{
    + int vout_mode, exponent;
    +
    + vout_mode = pmbus_read_byte_data(client, 0, PMBUS_VOUT_MODE);
    + if (vout_mode >= 0) {
    + /*
    + * Not all chips support the VOUT_MODE command,
    + * so a failure to read it is not an error.
    + */
    + switch (vout_mode >> 5) {
    + case 0: /* linear mode */
    + if (data->info->direct[PSC_VOLTAGE_OUT])
    + return -ENODEV;
    +
    + exponent = vout_mode & 0x1f;
    + /* and sign-extend it */
    + if (exponent & 0x10)
    + exponent |= ~0x1f;
    + data->exponent = exponent;
    + break;
    + case 2: /* direct mode */
    + if (!data->info->direct[PSC_VOLTAGE_OUT])
    + return -ENODEV;
    + break;
    + default:
    + return -ENODEV;
    + }
    + }
    +
    + /* Determine maximum number of sensors, booleans, and labels */
    + pmbus_find_max_attr(client, data);
    + pmbus_clear_fault_page(client, 0);
    + return 0;
    +}
    +
    +int pmbus_do_probe(struct i2c_client *client, const struct i2c_device_id *id,
    + struct pmbus_driver_info *info)
    +{
    + const struct pmbus_platform_data *pdata = client->dev.platform_data;
    + struct pmbus_data *data;
    + int ret;
    +
    + if (!info) {
    + dev_err(&client->dev, "Missing chip information");
    + return -ENODEV;
    + }
    +
    + if (!i2c_check_functionality(client->adapter, I2C_FUNC_SMBUS_WRITE_BYTE
    + | I2C_FUNC_SMBUS_BYTE_DATA
    + | I2C_FUNC_SMBUS_WORD_DATA))
    + return -ENODEV;
    +
    + data = kzalloc(sizeof(*data), GFP_KERNEL);
    + if (!data) {
    + dev_err(&client->dev, "No memory to allocate driver data\n");
    + return -ENOMEM;
    + }
    +
    + i2c_set_clientdata(client, data);
    + mutex_init(&data->update_lock);
    +
    + /*
    + * Bail out if status register or PMBus revision register
    + * does not exist.
    + */
    + if (i2c_smbus_read_byte_data(client, PMBUS_STATUS_BYTE) < 0
    + || i2c_smbus_read_byte_data(client, PMBUS_REVISION) < 0) {
    + dev_err(&client->dev,
    + "Status or revision register not found\n");
    + ret = -ENODEV;
    + goto out_data;
    + }
    +
    + if (pdata)
    + data->flags = pdata->flags;
    + data->info = info;
    +
    + pmbus_clear_faults(client);
    +
    + if (info->identify) {
    + ret = (*info->identify)(client, info);
    + if (ret < 0) {
    + dev_err(&client->dev, "Chip identification failed\n");
    + goto out_data;
    + }
    + }
    +
    + if (info->pages <= 0 || info->pages > PMBUS_PAGES) {
    + dev_err(&client->dev, "Bad number of PMBus pages: %d\n",
    + info->pages);
    + ret = -EINVAL;
    + goto out_data;
    + }
    + /*
    + * Bail out if more than one page was configured, but we can not
    + * select the highest page. This is an indication that the wrong
    + * chip type was selected. Better bail out now than keep
    + * returning errors later on.
    + */
    + if (info->pages > 1 && pmbus_set_page(client, info->pages - 1) < 0) {
    + dev_err(&client->dev, "Failed to select page %d\n",
    + info->pages - 1);
    + ret = -EINVAL;
    + goto out_data;
    + }
    +
    + ret = pmbus_identify_common(client, data);
    + if (ret < 0) {
    + dev_err(&client->dev, "Failed to identify chip capabilities\n");
    + goto out_data;
    + }
    +
    + ret = -ENOMEM;
    + data->sensors = kzalloc(sizeof(struct pmbus_sensor) * data->max_sensors,
    + GFP_KERNEL);
    + if (!data->sensors) {
    + dev_err(&client->dev, "No memory to allocate sensor data\n");
    + goto out_data;
    + }
    +
    + data->booleans = kzalloc(sizeof(struct pmbus_boolean)
    + * data->max_booleans, GFP_KERNEL);
    + if (!data->booleans) {
    + dev_err(&client->dev, "No memory to allocate boolean data\n");
    + goto out_sensors;
    + }
    +
    + data->labels = kzalloc(sizeof(struct pmbus_label) * data->max_labels,
    + GFP_KERNEL);
    + if (!data->labels) {
    + dev_err(&client->dev, "No memory to allocate label data\n");
    + goto out_booleans;
    + }
    +
    + data->attributes = kzalloc(sizeof(struct attribute *)
    + * data->max_attributes, GFP_KERNEL);
    + if (!data->attributes) {
    + dev_err(&client->dev, "No memory to allocate attribute data\n");
    + goto out_labels;
    + }
    +
    + pmbus_find_attributes(client, data);
    +
    + /*
    + * If there are no attributes, something is wrong.
    + * Bail out instead of trying to register nothing.
    + */
    + if (!data->num_attributes) {
    + dev_err(&client->dev, "No attributes found\n");
    + ret = -ENODEV;
    + goto out_attributes;
    + }
    +
    + /* Register sysfs hooks */
    + data->group.attrs = data->attributes;
    + ret = sysfs_create_group(&client->dev.kobj, &data->group);
    + if (ret) {
    + dev_err(&client->dev, "Failed to create sysfs entries\n");
    + goto out_attributes;
    + }
    + data->hwmon_dev = hwmon_device_register(&client->dev);
    + if (IS_ERR(data->hwmon_dev)) {
    + ret = PTR_ERR(data->hwmon_dev);
    + dev_err(&client->dev, "Failed to register hwmon device\n");
    + goto out_hwmon_device_register;
    + }
    + return 0;
    +
    +out_hwmon_device_register:
    + sysfs_remove_group(&client->dev.kobj, &data->group);
    +out_attributes:
    + kfree(data->attributes);
    +out_labels:
    + kfree(data->labels);
    +out_booleans:
    + kfree(data->booleans);
    +out_sensors:
    + kfree(data->sensors);
    +out_data:
    + kfree(data);
    + return ret;
    +}
    +EXPORT_SYMBOL_GPL(pmbus_do_probe);
    +
    +int pmbus_do_remove(struct i2c_client *client)
    +{
    + struct pmbus_data *data = i2c_get_clientdata(client);
    + hwmon_device_unregister(data->hwmon_dev);
    + sysfs_remove_group(&client->dev.kobj, &data->group);
    + kfree(data->attributes);
    + kfree(data->labels);
    + kfree(data->booleans);
    + kfree(data->sensors);
    + kfree(data);
    + return 0;
    +}
    +EXPORT_SYMBOL_GPL(pmbus_do_remove);
    +
    +MODULE_AUTHOR("Guenter Roeck");
    +MODULE_DESCRIPTION("PMBus core driver");
    +MODULE_LICENSE("GPL");
    diff --git a/include/linux/i2c/pmbus.h b/include/linux/i2c/pmbus.h
    new file mode 100644
    index 0000000..69280db
    --- /dev/null
    +++ b/include/linux/i2c/pmbus.h
    @@ -0,0 +1,45 @@
    +/*
    + * Hardware monitoring driver for PMBus devices
    + *
    + * Copyright (c) 2010, 2011 Ericsson AB.
    + *
    + * This program is free software; you can redistribute it and/or modify
    + * it under the terms of the GNU General Public License as published by
    + * the Free Software Foundation; either version 2 of the License, or
    + * (at your option) any later version.
    + *
    + * This program is distributed in the hope that it will be useful,
    + * but WITHOUT ANY WARRANTY; without even the implied warranty of
    + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
    + * GNU General Public License for more details.
    + *
    + * You should have received a copy of the GNU General Public License
    + * along with this program; if not, write to the Free Software
    + * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
    + */
    +
    +#ifndef _PMBUS_H_
    +#define _PMBUS_H_
    +
    +/* flags */
    +
    +/*
    + * PMBUS_SKIP_STATUS_CHECK
    + *
    + * During register detection, skip checking the status register for
    + * communication or command errors.
    + *
    + * Some PMBus chips respond with valid data when trying to read an unsupported
    + * register. For such chips, checking the status register is mandatory when
    + * trying to determine if a chip register exists or not.
    + * Other PMBus chips don't support the STATUS_CML register, or report
    + * communication errors for no explicable reason. For such chips, checking
    + * the status register must be disabled.
    + */
    +#define PMBUS_SKIP_STATUS_CHECK (1 << 0)
    +
    +struct pmbus_platform_data {
    + u32 flags; /* Device specific flags */
    +};
    +
    +#endif /* _PMBUS_H_ */
    --
    1.7.3.1


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