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Guenter Roeck
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hwmon: (pmbus) Add support for Analog Devices ADM1275
Add support for Analog Devices ADM1275 Hot-Swap Controller and Digital Power Monitor Signed-off-by: Guenter Roeck <[email protected]> Reviewed-by: Tom Grennan <[email protected]>
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‎Documentation/hwmon/adm1275‎

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Kernel driver adm1275
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=====================
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Supported chips:
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* Analog Devices ADM1275
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Prefix: 'adm1275'
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Addresses scanned: -
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Datasheet: www.analog.com/static/imported-files/data_sheets/ADM1275.pdf
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Author: Guenter Roeck <[email protected]>
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Description
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-----------
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This driver supports hardware montoring for Analog Devices ADM1275 Hot-Swap
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Controller and Digital Power Monitor.
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The ADM1275 is a hot-swap controller that allows a circuit board to be removed
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from or inserted into a live backplane. It also features current and voltage
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readback via an integrated 12-bit analog-to-digital converter (ADC), accessed
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using a PMBus. interface.
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The driver is a client driver to the core PMBus driver. Please see
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Documentation/hwmon/pmbus for details on PMBus client drivers.
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Usage Notes
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-----------
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This driver does not auto-detect devices. You will have to instantiate the
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devices explicitly. Please see Documentation/i2c/instantiating-devices for
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details.
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Platform data support
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---------------------
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The driver supports standard PMBus driver platform data. Please see
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Documentation/hwmon/pmbus for details.
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Sysfs entries
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-------------
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The following attributes are supported. Limits are read-write; all other
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attributes are read-only.
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in1_label "vin1" or "vout1" depending on chip variant and
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configuration.
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in1_input Measured voltage. From READ_VOUT register.
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in1_min Minumum Voltage. From VOUT_UV_WARN_LIMIT register.
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in1_max Maximum voltage. From VOUT_OV_WARN_LIMIT register.
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in1_min_alarm Voltage low alarm. From VOLTAGE_UV_WARNING status.
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in1_max_alarm Voltage high alarm. From VOLTAGE_OV_WARNING status.
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curr1_label "iout1"
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curr1_input Measured current. From READ_IOUT register.
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curr1_max Maximum current. From IOUT_OC_WARN_LIMIT register.
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curr1_max_alarm Current high alarm. From IOUT_OC_WARN_LIMIT register.

‎drivers/hwmon/Kconfig‎

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This driver can also be built as a module. If so, the module will
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be called pmbus.
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config SENSORS_ADM1275
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tristate "Analog Devices ADM1275"
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default n
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help
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If you say yes here you get hardware monitoring support for Analog
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Devices ADM1275 Hot-Swap Controller and Digital Power Monitor.
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This driver can also be built as a module. If so, the module will
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be called adm1275.
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config SENSORS_MAX16064
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tristate "Maxim MAX16064"
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default n

‎drivers/hwmon/Makefile‎

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# PMBus drivers
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obj-$(CONFIG_PMBUS) += pmbus_core.o
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obj-$(CONFIG_SENSORS_PMBUS) += pmbus.o
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obj-$(CONFIG_SENSORS_ADM1275) += adm1275.o
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obj-$(CONFIG_SENSORS_MAX16064) += max16064.o
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obj-$(CONFIG_SENSORS_MAX34440) += max34440.o
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obj-$(CONFIG_SENSORS_MAX8688) += max8688.o

‎drivers/hwmon/adm1275.c‎

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/*
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* Hardware monitoring driver for Analog Devices ADM1275 Hot-Swap Controller
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* and Digital Power Monitor
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*
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* Copyright (c) 2011 Ericsson AB.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*/
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/init.h>
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#include <linux/err.h>
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#include <linux/slab.h>
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#include <linux/i2c.h>
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#include "pmbus.h"
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#define ADM1275_PMON_CONFIG 0xd4
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#define ADM1275_VIN_VOUT_SELECT (1 << 6)
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#define ADM1275_VRANGE (1 << 5)
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static int adm1275_probe(struct i2c_client *client,
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const struct i2c_device_id *id)
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{
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int config;
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struct pmbus_driver_info *info;
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if (!i2c_check_functionality(client->adapter,
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I2C_FUNC_SMBUS_READ_BYTE_DATA))
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return -ENODEV;
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info = kzalloc(sizeof(struct pmbus_driver_info), GFP_KERNEL);
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if (!info)
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return -ENOMEM;
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config = i2c_smbus_read_byte_data(client, ADM1275_PMON_CONFIG);
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if (config < 0)
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return config;
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info->pages = 1;
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info->direct[PSC_VOLTAGE_IN] = true;
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info->direct[PSC_VOLTAGE_OUT] = true;
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info->direct[PSC_CURRENT_OUT] = true;
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info->m[PSC_CURRENT_OUT] = 800;
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info->b[PSC_CURRENT_OUT] = 20475;
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info->R[PSC_CURRENT_OUT] = -1;
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info->func[0] = PMBUS_HAVE_IOUT | PMBUS_HAVE_STATUS_IOUT;
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if (config & ADM1275_VRANGE) {
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info->m[PSC_VOLTAGE_IN] = 19045;
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info->b[PSC_VOLTAGE_IN] = 0;
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info->R[PSC_VOLTAGE_IN] = -2;
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info->m[PSC_VOLTAGE_OUT] = 19045;
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info->b[PSC_VOLTAGE_OUT] = 0;
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info->R[PSC_VOLTAGE_OUT] = -2;
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} else {
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info->m[PSC_VOLTAGE_IN] = 6666;
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info->b[PSC_VOLTAGE_IN] = 0;
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info->R[PSC_VOLTAGE_IN] = -1;
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info->m[PSC_VOLTAGE_OUT] = 6666;
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info->b[PSC_VOLTAGE_OUT] = 0;
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info->R[PSC_VOLTAGE_OUT] = -1;
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}
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if (config & ADM1275_VIN_VOUT_SELECT)
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info->func[0] |= PMBUS_HAVE_VOUT | PMBUS_HAVE_STATUS_VOUT;
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else
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info->func[0] |= PMBUS_HAVE_VIN | PMBUS_HAVE_STATUS_INPUT;
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return pmbus_do_probe(client, id, info);
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}
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static int adm1275_remove(struct i2c_client *client)
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{
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const struct pmbus_driver_info *info = pmbus_get_driver_info(client);
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int ret;
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ret = pmbus_do_remove(client);
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kfree(info);
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return ret;
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}
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static const struct i2c_device_id adm1275_id[] = {
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{"adm1275", 0},
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{ }
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};
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MODULE_DEVICE_TABLE(i2c, adm1275_id);
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static struct i2c_driver adm1275_driver = {
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.driver = {
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.name = "adm1275",
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},
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.probe = adm1275_probe,
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.remove = adm1275_remove,
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.id_table = adm1275_id,
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};
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static int __init adm1275_init(void)
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{
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return i2c_add_driver(&adm1275_driver);
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}
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static void __exit adm1275_exit(void)
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{
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i2c_del_driver(&adm1275_driver);
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}
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MODULE_AUTHOR("Guenter Roeck");
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MODULE_DESCRIPTION("PMBus driver for Analog Devices ADM1275");
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MODULE_LICENSE("GPL");
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module_init(adm1275_init);
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module_exit(adm1275_exit);

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