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hwmon: (pmbus) Add support for TI UCD9200 series of PWM System Controllers

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This patch adds hardware monitoring support for TI UCD9220, UCD9222, UCD9224,
UCD9240, UCD9244, UCD9246, and UCD9248 Digital PWM System Controllers.

Signed-off-by: Guenter Roeck <guenter.roeck@ericsson.com>
Reviewed-by: Tom Grennan <tom.grennan@ericsson.com>
This commit is contained in:
Guenter Roeck 2011-03-06 15:54:27 -08:00
parent 6586b14c7b
commit 84fc4585c1
4 changed files with 333 additions and 0 deletions
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112
Documentation/hwmon/ucd9200 Normal file
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Kernel driver ucd9200
=====================
Supported chips:
* TI UCD9220, UCD9222, UCD9224, UCD9240, UCD9244, UCD9246, and UCD9248
Prefixes: 'ucd9220', 'ucd9222', 'ucd9224', 'ucd9240', 'ucd9244', 'ucd9246',
'ucd9248'
Addresses scanned: -
Datasheets:
http://focus.ti.com/lit/ds/symlink/ucd9220.pdf
http://focus.ti.com/lit/ds/symlink/ucd9222.pdf
http://focus.ti.com/lit/ds/symlink/ucd9224.pdf
http://focus.ti.com/lit/ds/symlink/ucd9240.pdf
http://focus.ti.com/lit/ds/symlink/ucd9244.pdf
http://focus.ti.com/lit/ds/symlink/ucd9246.pdf
http://focus.ti.com/lit/ds/symlink/ucd9248.pdf
Author: Guenter Roeck <guenter.roeck@ericsson.com>
Description
-----------
[From datasheets] UCD9220, UCD9222, UCD9224, UCD9240, UCD9244, UCD9246, and
UCD9248 are multi-rail, multi-phase synchronous buck digital PWM controllers
designed for non-isolated DC/DC power applications. The devices integrate
dedicated circuitry for DC/DC loop management with flash memory and a serial
interface to support configuration, monitoring and management.
This driver is a client driver to the core PMBus driver. Please see
Documentation/hwmon/pmbus for details on PMBus client drivers.
Usage Notes
-----------
This driver does not auto-detect devices. You will have to instantiate the
devices explicitly. Please see Documentation/i2c/instantiating-devices for
details.
Platform data support
---------------------
The driver supports standard PMBus driver platform data. Please see
Documentation/hwmon/pmbus for details.
Sysfs entries
-------------
The following attributes are supported. Limits are read-write; all other
attributes are read-only.
in1_label "vin".
in1_input Measured voltage. From READ_VIN register.
in1_min Minumum Voltage. From VIN_UV_WARN_LIMIT register.
in1_max Maximum voltage. From VIN_OV_WARN_LIMIT register.
in1_lcrit Critical minumum Voltage. VIN_UV_FAULT_LIMIT register.
in1_crit Critical maximum voltage. From VIN_OV_FAULT_LIMIT register.
in1_min_alarm Voltage low alarm. From VIN_UV_WARNING status.
in1_max_alarm Voltage high alarm. From VIN_OV_WARNING status.
in1_lcrit_alarm Voltage critical low alarm. From VIN_UV_FAULT status.
in1_crit_alarm Voltage critical high alarm. From VIN_OV_FAULT status.
in[2-5]_label "vout[1-4]".
in[2-5]_input Measured voltage. From READ_VOUT register.
in[2-5]_min Minumum Voltage. From VOUT_UV_WARN_LIMIT register.
in[2-5]_max Maximum voltage. From VOUT_OV_WARN_LIMIT register.
in[2-5]_lcrit Critical minumum Voltage. VOUT_UV_FAULT_LIMIT register.
in[2-5]_crit Critical maximum voltage. From VOUT_OV_FAULT_LIMIT register.
in[2-5]_min_alarm Voltage low alarm. From VOLTAGE_UV_WARNING status.
in[2-5]_max_alarm Voltage high alarm. From VOLTAGE_OV_WARNING status.
in[2-5]_lcrit_alarm Voltage critical low alarm. From VOLTAGE_UV_FAULT status.
in[2-5]_crit_alarm Voltage critical high alarm. From VOLTAGE_OV_FAULT status.
curr1_label "iin".
curr1_input Measured current. From READ_IIN register.
curr[2-5]_label "iout[1-4]".
curr[2-5]_input Measured current. From READ_IOUT register.
curr[2-5]_max Maximum current. From IOUT_OC_WARN_LIMIT register.
curr[2-5]_lcrit Critical minumum output current. From IOUT_UC_FAULT_LIMIT
register.
curr[2-5]_crit Critical maximum current. From IOUT_OC_FAULT_LIMIT register.
curr[2-5]_max_alarm Current high alarm. From IOUT_OC_WARNING status.
curr[2-5]_crit_alarm Current critical high alarm. From IOUT_OC_FAULT status.
power1_input Measured input power. From READ_PIN register.
power1_label "pin"
power[2-5]_input Measured output power. From READ_POUT register.
power[2-5]_label "pout[1-4]"
The number of output voltage, current, and power
attribute sets is determined by the number of enabled
rails. See chip datasheets for details.
temp[1-5]_input Measured temperatures. From READ_TEMPERATURE_1 and
READ_TEMPERATURE_2 registers.
temp1 is the chip internal temperature. temp[2-5] are
rail temperatures. temp[2-5] attributes are only
created for enabled rails. See chip datasheets for
details.
temp[1-5]_max Maximum temperature. From OT_WARN_LIMIT register.
temp[1-5]_crit Critical high temperature. From OT_FAULT_LIMIT register.
temp[1-5]_max_alarm Temperature high alarm.
temp[1-5]_crit_alarm Temperature critical high alarm.
fan1_input Fan RPM. ucd9240 only.
fan1_alarm Fan alarm. ucd9240 only.
fan1_fault Fan fault. ucd9240 only.

10
drivers/hwmon/Kconfig
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@ -857,6 +857,16 @@ config SENSORS_MAX8688
This driver can also be built as a module. If so, the module will
be called max8688.
config SENSORS_UCD9200
tristate "TI UCD9220, UCD9222, UCD9224, UCD9240, UCD9244, UCD9246, UCD9248"
default n
help
If you say yes here you get hardware monitoring support for TI
UCD9220, UCD9222, UCD9224, UCD9240, UCD9244, UCD9246, and UCD9248.
This driver can also be built as a module. If so, the module will
be called ucd9200.
endif # PMBUS
config SENSORS_SHT15

1
drivers/hwmon/Makefile
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@ -123,6 +123,7 @@ obj-$(CONFIG_SENSORS_PMBUS) += pmbus.o
obj-$(CONFIG_SENSORS_MAX16064) += max16064.o
obj-$(CONFIG_SENSORS_MAX34440) += max34440.o
obj-$(CONFIG_SENSORS_MAX8688) += max8688.o
obj-$(CONFIG_SENSORS_UCD9200) += ucd9200.o
ccflags-$(CONFIG_HWMON_DEBUG_CHIP) := -DDEBUG

210
drivers/hwmon/ucd9200.c Normal file
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/*
* Hardware monitoring driver for ucd9200 series Digital PWM System Controllers
*
* Copyright (C) 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/i2c/pmbus.h>
#include "pmbus.h"
#define UCD9200_PHASE_INFO 0xd2
#define UCD9200_DEVICE_ID 0xfd
enum chips { ucd9200, ucd9220, ucd9222, ucd9224, ucd9240, ucd9244, ucd9246,
ucd9248 };
static const struct i2c_device_id ucd9200_id[] = {
{"ucd9200", ucd9200},
{"ucd9220", ucd9220},
{"ucd9222", ucd9222},
{"ucd9224", ucd9224},
{"ucd9240", ucd9240},
{"ucd9244", ucd9244},
{"ucd9246", ucd9246},
{"ucd9248", ucd9248},
{}
};
MODULE_DEVICE_TABLE(i2c, ucd9200_id);
static int ucd9200_probe(struct i2c_client *client,
const struct i2c_device_id *id)
{
u8 block_buffer[I2C_SMBUS_BLOCK_MAX + 1];
struct pmbus_driver_info *info;
const struct i2c_device_id *mid;
int i, j, ret;
if (!i2c_check_functionality(client->adapter,
I2C_FUNC_SMBUS_BYTE_DATA |
I2C_FUNC_SMBUS_BLOCK_DATA))
return -ENODEV;
ret = i2c_smbus_read_block_data(client, UCD9200_DEVICE_ID,
block_buffer);
if (ret < 0) {
dev_err(&client->dev, "Failed to read device ID\n");
return ret;
}
block_buffer[ret] = '\0';
dev_info(&client->dev, "Device ID %s\n", block_buffer);
mid = NULL;
for (i = 0; i < ARRAY_SIZE(ucd9200_id); i++) {
mid = &ucd9200_id[i];
if (!strncasecmp(mid->name, block_buffer, strlen(mid->name)))
break;
}
if (!mid || !strlen(mid->name)) {
dev_err(&client->dev, "Unsupported device\n");
return -ENODEV;
}
if (id->driver_data != ucd9200 && id->driver_data != mid->driver_data)
dev_notice(&client->dev,
"Device mismatch: Configured %s, detected %s\n",
id->name, mid->name);
info = kzalloc(sizeof(struct pmbus_driver_info), GFP_KERNEL);
if (!info)
return -ENOMEM;
ret = i2c_smbus_read_block_data(client, UCD9200_PHASE_INFO,
block_buffer);
if (ret < 0) {
dev_err(&client->dev, "Failed to read phase information\n");
goto out;
}
/*
* Calculate number of configured pages (rails) from PHASE_INFO
* register.
* Rails have to be sequential, so we can abort after finding
* the first unconfigured rail.
*/
info->pages = 0;
for (i = 0; i < ret; i++) {
if (!block_buffer[i])
break;
info->pages++;
}
if (!info->pages) {
dev_err(&client->dev, "No rails configured\n");
ret = -ENODEV;
goto out;
}
dev_info(&client->dev, "%d rails configured\n", info->pages);
/*
* Set PHASE registers on all pages to 0xff to ensure that phase
* specific commands will apply to all phases of a given page (rail).
* This only affects the READ_IOUT and READ_TEMPERATURE2 registers.
* READ_IOUT will return the sum of currents of all phases of a rail,
* and READ_TEMPERATURE2 will return the maximum temperature detected
* for the the phases of the rail.
*/
for (i = 0; i < info->pages; i++) {
/*
* Setting PAGE & PHASE fails once in a while for no obvious
* reason, so we need to retry a couple of times.
*/
for (j = 0; j < 3; j++) {
ret = i2c_smbus_write_byte_data(client, PMBUS_PAGE, i);
if (ret < 0)
continue;
ret = i2c_smbus_write_byte_data(client, PMBUS_PHASE,
0xff);
if (ret < 0)
continue;
break;
}
if (ret < 0) {
dev_err(&client->dev,
"Failed to initialize PHASE registers\n");
goto out;
}
}
if (info->pages > 1)
i2c_smbus_write_byte_data(client, PMBUS_PAGE, 0);
info->func[0] = PMBUS_HAVE_VIN | PMBUS_HAVE_STATUS_INPUT |
PMBUS_HAVE_IIN | PMBUS_HAVE_PIN |
PMBUS_HAVE_VOUT | PMBUS_HAVE_STATUS_VOUT |
PMBUS_HAVE_IOUT | PMBUS_HAVE_STATUS_IOUT |
PMBUS_HAVE_POUT | PMBUS_HAVE_TEMP |
PMBUS_HAVE_TEMP2 | PMBUS_HAVE_STATUS_TEMP;
for (i = 1; i < info->pages; i++)
info->func[i] = PMBUS_HAVE_VOUT | PMBUS_HAVE_STATUS_VOUT |
PMBUS_HAVE_IOUT | PMBUS_HAVE_STATUS_IOUT |
PMBUS_HAVE_POUT |
PMBUS_HAVE_TEMP2 | PMBUS_HAVE_STATUS_TEMP;
/* ucd9240 supports a single fan */
if (mid->driver_data == ucd9240)
info->func[0] |= PMBUS_HAVE_FAN12 | PMBUS_HAVE_STATUS_FAN12;
ret = pmbus_do_probe(client, mid, info);
if (ret < 0)
goto out;
return 0;
out:
kfree(info);
return ret;
}
static int ucd9200_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;
}
/* This is the driver that will be inserted */
static struct i2c_driver ucd9200_driver = {
.driver = {
.name = "ucd9200",
},
.probe = ucd9200_probe,
.remove = ucd9200_remove,
.id_table = ucd9200_id,
};
static int __init ucd9200_init(void)
{
return i2c_add_driver(&ucd9200_driver);
}
static void __exit ucd9200_exit(void)
{
i2c_del_driver(&ucd9200_driver);
}
MODULE_AUTHOR("Guenter Roeck");
MODULE_DESCRIPTION("PMBus driver for TI UCD922x, UCD924x");
MODULE_LICENSE("GPL");
module_init(ucd9200_init);
module_exit(ucd9200_exit);