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hwmon: PMBus device driver

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This driver adds support for hardware monitoring features of various PMBus
devices.

Signed-off-by: Guenter Roeck <guenter.roeck@ericsson.com>
Acked-by: Jonathan Cameron <jic23@cam.ac.uk>
This commit is contained in:
Guenter Roeck 2011-01-26 20:09:02 -08:00
parent 06923f8442
commit 442aba7872
6 changed files with 2218 additions and 0 deletions
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25
drivers/hwmon/Kconfig
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@ -756,6 +756,31 @@ 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

4
drivers/hwmon/Makefile
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@ -114,6 +114,10 @@ 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

203
drivers/hwmon/pmbus.c Normal file
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@ -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);

313
drivers/hwmon/pmbus.h Normal file
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@ -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 */

1628
drivers/hwmon/pmbus_core.c Normal file
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45
include/linux/i2c/pmbus.h Normal file
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@ -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_ */