hwmon: (pmbus) Add support for Analog Devices ADM1275 (83f7649c) · Commits · e / devices / android_kernel_fairphone_FP4

Documentation/hwmon/adm1275

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		Kernel driver adm1275
		=====================

		Supported chips:
		* Analog Devices ADM1275
		Prefix: 'adm1275'
		Addresses scanned: -
		Datasheet: www.analog.com/static/imported-files/data_sheets/ADM1275.pdf

		Author: Guenter Roeck <guenter.roeck@ericsson.com>


		Description
		-----------

		This driver supports hardware montoring for Analog Devices ADM1275 Hot-Swap
		Controller and Digital Power Monitor.

		The ADM1275 is a hot-swap controller that allows a circuit board to be removed
		from or inserted into a live backplane. It also features current and voltage
		readback via an integrated 12-bit analog-to-digital converter (ADC), accessed
		using a PMBus. interface.

		The 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 "vin1" or "vout1" depending on chip variant and
		configuration.
		in1_input Measured voltage. From READ_VOUT register.
		in1_min Minumum Voltage. From VOUT_UV_WARN_LIMIT register.
		in1_max Maximum voltage. From VOUT_OV_WARN_LIMIT register.
		in1_min_alarm Voltage low alarm. From VOLTAGE_UV_WARNING status.
		in1_max_alarm Voltage high alarm. From VOLTAGE_OV_WARNING status.

		curr1_label "iout1"
		curr1_input Measured current. From READ_IOUT register.
		curr1_max Maximum current. From IOUT_OC_WARN_LIMIT register.
		curr1_max_alarm Current high alarm. From IOUT_OC_WARN_LIMIT register.

drivers/hwmon/Kconfig

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		@@ -827,6 +827,16 @@ config SENSORS_PMBUS
		This driver can also be built as a module. If so, the module will
		be called pmbus.

		config SENSORS_ADM1275
		tristate "Analog Devices ADM1275"
		default n
		help
		If you say yes here you get hardware monitoring support for Analog
		Devices ADM1275 Hot-Swap Controller and Digital Power Monitor.

		This driver can also be built as a module. If so, the module will
		be called adm1275.

		config SENSORS_MAX16064
		tristate "Maxim MAX16064"
		default n

drivers/hwmon/Makefile

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		@@ -120,6 +120,7 @@ obj-$(CONFIG_SENSORS_WM8350) += wm8350-hwmon.o
		# PMBus drivers
		obj-$(CONFIG_PMBUS) += pmbus_core.o
		obj-$(CONFIG_SENSORS_PMBUS) += pmbus.o
		obj-$(CONFIG_SENSORS_ADM1275) += adm1275.o
		obj-$(CONFIG_SENSORS_MAX16064) += max16064.o
		obj-$(CONFIG_SENSORS_MAX34440) += max34440.o
		obj-$(CONFIG_SENSORS_MAX8688) += max8688.o

drivers/hwmon/adm1275.c

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		/*
		* Hardware monitoring driver for Analog Devices ADM1275 Hot-Swap Controller
		* and Digital Power Monitor
		*
		* 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.
		*/

		#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 "pmbus.h"

		#define ADM1275_PMON_CONFIG 0xd4

		#define ADM1275_VIN_VOUT_SELECT (1 << 6)
		#define ADM1275_VRANGE (1 << 5)

		static int adm1275_probe(struct i2c_client *client,
		const struct i2c_device_id *id)
		{
		int config;
		struct pmbus_driver_info *info;

		if (!i2c_check_functionality(client->adapter,
		I2C_FUNC_SMBUS_READ_BYTE_DATA))
		return -ENODEV;

		info = kzalloc(sizeof(struct pmbus_driver_info), GFP_KERNEL);
		if (!info)
		return -ENOMEM;

		config = i2c_smbus_read_byte_data(client, ADM1275_PMON_CONFIG);
		if (config < 0)
		return config;

		info->pages = 1;
		info->direct[PSC_VOLTAGE_IN] = true;
		info->direct[PSC_VOLTAGE_OUT] = true;
		info->direct[PSC_CURRENT_OUT] = true;
		info->m[PSC_CURRENT_OUT] = 800;
		info->b[PSC_CURRENT_OUT] = 20475;
		info->R[PSC_CURRENT_OUT] = -1;
		info->func[0] = PMBUS_HAVE_IOUT \| PMBUS_HAVE_STATUS_IOUT;

		if (config & ADM1275_VRANGE) {
		info->m[PSC_VOLTAGE_IN] = 19045;
		info->b[PSC_VOLTAGE_IN] = 0;
		info->R[PSC_VOLTAGE_IN] = -2;
		info->m[PSC_VOLTAGE_OUT] = 19045;
		info->b[PSC_VOLTAGE_OUT] = 0;
		info->R[PSC_VOLTAGE_OUT] = -2;
		} else {
		info->m[PSC_VOLTAGE_IN] = 6666;
		info->b[PSC_VOLTAGE_IN] = 0;
		info->R[PSC_VOLTAGE_IN] = -1;
		info->m[PSC_VOLTAGE_OUT] = 6666;
		info->b[PSC_VOLTAGE_OUT] = 0;
		info->R[PSC_VOLTAGE_OUT] = -1;
		}

		if (config & ADM1275_VIN_VOUT_SELECT)
		info->func[0] \|= PMBUS_HAVE_VOUT \| PMBUS_HAVE_STATUS_VOUT;
		else
		info->func[0] \|= PMBUS_HAVE_VIN \| PMBUS_HAVE_STATUS_INPUT;

		return pmbus_do_probe(client, id, info);
		}

		static int adm1275_remove(struct i2c_client *client)
		{
		const struct pmbus_driver_info *info = pmbus_get_driver_info(client);
		int ret;

		ret = pmbus_do_remove(client);
		kfree(info);
		return ret;
		}

		static const struct i2c_device_id adm1275_id[] = {
		{"adm1275", 0},
		{ }
		};
		MODULE_DEVICE_TABLE(i2c, adm1275_id);

		static struct i2c_driver adm1275_driver = {
		.driver = {
		.name = "adm1275",
		},
		.probe = adm1275_probe,
		.remove = adm1275_remove,
		.id_table = adm1275_id,
		};

		static int __init adm1275_init(void)
		{
		return i2c_add_driver(&adm1275_driver);
		}

		static void __exit adm1275_exit(void)
		{
		i2c_del_driver(&adm1275_driver);
		}

		MODULE_AUTHOR("Guenter Roeck");
		MODULE_DESCRIPTION("PMBus driver for Analog Devices ADM1275");
		MODULE_LICENSE("GPL");
		module_init(adm1275_init);
		module_exit(adm1275_exit);