drivers/hwmon/pmbus/adm1275.c - linux - Git at Google

 /*
  * 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"

 enum chips { adm1275, adm1276 };

 #define ADM1275_PEAK_IOUT		0xd0
 #define ADM1275_PEAK_VIN		0xd1
 #define ADM1275_PEAK_VOUT		0xd2
 #define ADM1275_PMON_CONFIG		0xd4

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

 #define ADM1275_IOUT_WARN2_LIMIT	0xd7
 #define ADM1275_DEVICE_CONFIG		0xd8

 #define ADM1275_IOUT_WARN2_SELECT	(1 << 4)

 #define ADM1276_PEAK_PIN		0xda

 #define ADM1275_MFR_STATUS_IOUT_WARN2	(1 << 0)

 struct adm1275_data {
 	int id;
 	bool have_oc_fault;
 	struct pmbus_driver_info info;
 };

 #define to_adm1275_data(x)  container_of(x, struct adm1275_data, info)

 static int adm1275_read_word_data(struct i2c_client *client, int page, int reg)
 {
 	const struct pmbus_driver_info *info = pmbus_get_driver_info(client);
 	const struct adm1275_data *data = to_adm1275_data(info);
 	int ret = 0;

 	if (page)
 		return -ENXIO;

 	switch (reg) {
 	case PMBUS_IOUT_UC_FAULT_LIMIT:
 		if (data->have_oc_fault) {
 			ret = -ENXIO;
 			break;
 		}
 		ret = pmbus_read_word_data(client, 0, ADM1275_IOUT_WARN2_LIMIT);
 		break;
 	case PMBUS_IOUT_OC_FAULT_LIMIT:
 		if (!data->have_oc_fault) {
 			ret = -ENXIO;
 			break;
 		}
 		ret = pmbus_read_word_data(client, 0, ADM1275_IOUT_WARN2_LIMIT);
 		break;
 	case PMBUS_VIRT_READ_IOUT_MAX:
 		ret = pmbus_read_word_data(client, 0, ADM1275_PEAK_IOUT);
 		break;
 	case PMBUS_VIRT_READ_VOUT_MAX:
 		ret = pmbus_read_word_data(client, 0, ADM1275_PEAK_VOUT);
 		break;
 	case PMBUS_VIRT_READ_VIN_MAX:
 		ret = pmbus_read_word_data(client, 0, ADM1275_PEAK_VIN);
 		break;
 	case PMBUS_VIRT_READ_PIN_MAX:
 		if (data->id != adm1276) {
 			ret = -ENXIO;
 			break;
 		}
 		ret = pmbus_read_word_data(client, 0, ADM1276_PEAK_PIN);
 		break;
 	case PMBUS_VIRT_RESET_IOUT_HISTORY:
 	case PMBUS_VIRT_RESET_VOUT_HISTORY:
 	case PMBUS_VIRT_RESET_VIN_HISTORY:
 		break;
 	case PMBUS_VIRT_RESET_PIN_HISTORY:
 		if (data->id != adm1276)
 			ret = -ENXIO;
 		break;
 	default:
 		ret = -ENODATA;
 		break;
 	}
 	return ret;
 }

 static int adm1275_write_word_data(struct i2c_client *client, int page, int reg,
 				   u16 word)
 {
 	int ret;

 	if (page)
 		return -ENXIO;

 	switch (reg) {
 	case PMBUS_IOUT_UC_FAULT_LIMIT:
 	case PMBUS_IOUT_OC_FAULT_LIMIT:
 		ret = pmbus_write_word_data(client, 0, ADM1275_IOUT_WARN2_LIMIT,
 					    word);
 		break;
 	case PMBUS_VIRT_RESET_IOUT_HISTORY:
 		ret = pmbus_write_word_data(client, 0, ADM1275_PEAK_IOUT, 0);
 		break;
 	case PMBUS_VIRT_RESET_VOUT_HISTORY:
 		ret = pmbus_write_word_data(client, 0, ADM1275_PEAK_VOUT, 0);
 		break;
 	case PMBUS_VIRT_RESET_VIN_HISTORY:
 		ret = pmbus_write_word_data(client, 0, ADM1275_PEAK_VIN, 0);
 		break;
 	case PMBUS_VIRT_RESET_PIN_HISTORY:
 		ret = pmbus_write_word_data(client, 0, ADM1276_PEAK_PIN, 0);
 		break;
 	default:
 		ret = -ENODATA;
 		break;
 	}
 	return ret;
 }

 static int adm1275_read_byte_data(struct i2c_client *client, int page, int reg)
 {
 	const struct pmbus_driver_info *info = pmbus_get_driver_info(client);
 	const struct adm1275_data *data = to_adm1275_data(info);
 	int mfr_status, ret;

 	if (page > 0)
 		return -ENXIO;

 	switch (reg) {
 	case PMBUS_STATUS_IOUT:
 		ret = pmbus_read_byte_data(client, page, PMBUS_STATUS_IOUT);
 		if (ret < 0)
 			break;
 		mfr_status = pmbus_read_byte_data(client, page,
 						  PMBUS_STATUS_MFR_SPECIFIC);
 		if (mfr_status < 0) {
 			ret = mfr_status;
 			break;
 		}
 		if (mfr_status & ADM1275_MFR_STATUS_IOUT_WARN2) {
 			ret |= data->have_oc_fault ?
 			  PB_IOUT_OC_FAULT : PB_IOUT_UC_FAULT;
 		}
 		break;
 	default:
 		ret = -ENODATA;
 		break;
 	}
 	return ret;
 }

 static const struct i2c_device_id adm1275_id[] = {
 	{ "adm1275", adm1275 },
 	{ "adm1276", adm1276 },
 	{ }
 };
 MODULE_DEVICE_TABLE(i2c, adm1275_id);

 static int adm1275_probe(struct i2c_client *client,
 			 const struct i2c_device_id *id)
 {
 	u8 block_buffer[I2C_SMBUS_BLOCK_MAX + 1];
 	int config, device_config;
 	int ret;
 	struct pmbus_driver_info *info;
 	struct adm1275_data *data;
 	const struct i2c_device_id *mid;

 	if (!i2c_check_functionality(client->adapter,
 				     I2C_FUNC_SMBUS_READ_BYTE_DATA
 				     | I2C_FUNC_SMBUS_BLOCK_DATA))
 		return -ENODEV;

 	ret = i2c_smbus_read_block_data(client, PMBUS_MFR_ID, block_buffer);
 	if (ret < 0) {
 		dev_err(&client->dev, "Failed to read Manufacturer ID\n");
 		return ret;
 	}
 	if (ret != 3 || strncmp(block_buffer, "ADI", 3)) {
 		dev_err(&client->dev, "Unsupported Manufacturer ID\n");
 		return -ENODEV;
 	}

 	ret = i2c_smbus_read_block_data(client, PMBUS_MFR_MODEL, block_buffer);
 	if (ret < 0) {
 		dev_err(&client->dev, "Failed to read Manufacturer Model\n");
 		return ret;
 	}
 	for (mid = adm1275_id; mid->name[0]; mid++) {
 		if (!strncasecmp(mid->name, block_buffer, strlen(mid->name)))
 			break;
 	}
 	if (!mid->name[0]) {
 		dev_err(&client->dev, "Unsupported device\n");
 		return -ENODEV;
 	}

 	if (id->driver_data != mid->driver_data)
 		dev_notice(&client->dev,
 			   "Device mismatch: Configured %s, detected %s\n",
 			   id->name, mid->name);

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

 	device_config = i2c_smbus_read_byte_data(client, ADM1275_DEVICE_CONFIG);
 	if (device_config < 0)
 		return device_config;

 	data = devm_kzalloc(&client->dev, sizeof(struct adm1275_data),
 			    GFP_KERNEL);
 	if (!data)
 		return -ENOMEM;

 	data->id = mid->driver_data;

 	info = &data->info;

 	info->pages = 1;
 	info->format[PSC_VOLTAGE_IN] = direct;
 	info->format[PSC_VOLTAGE_OUT] = direct;
 	info->format[PSC_CURRENT_OUT] = direct;
 	info->m[PSC_CURRENT_OUT] = 807;
 	info->b[PSC_CURRENT_OUT] = 20475;
 	info->R[PSC_CURRENT_OUT] = -1;
 	info->func[0] = PMBUS_HAVE_IOUT | PMBUS_HAVE_STATUS_IOUT;

 	info->read_word_data = adm1275_read_word_data;
 	info->read_byte_data = adm1275_read_byte_data;
 	info->write_word_data = adm1275_write_word_data;

 	if (config & ADM1275_VRANGE) {
 		info->m[PSC_VOLTAGE_IN] = 19199;
 		info->b[PSC_VOLTAGE_IN] = 0;
 		info->R[PSC_VOLTAGE_IN] = -2;
 		info->m[PSC_VOLTAGE_OUT] = 19199;
 		info->b[PSC_VOLTAGE_OUT] = 0;
 		info->R[PSC_VOLTAGE_OUT] = -2;
 	} else {
 		info->m[PSC_VOLTAGE_IN] = 6720;
 		info->b[PSC_VOLTAGE_IN] = 0;
 		info->R[PSC_VOLTAGE_IN] = -1;
 		info->m[PSC_VOLTAGE_OUT] = 6720;
 		info->b[PSC_VOLTAGE_OUT] = 0;
 		info->R[PSC_VOLTAGE_OUT] = -1;
 	}

 	if (device_config & ADM1275_IOUT_WARN2_SELECT)
 		data->have_oc_fault = true;

 	switch (data->id) {
 	case adm1275:
 		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;
 		break;
 	case adm1276:
 		info->format[PSC_POWER] = direct;
 		info->func[0] |= PMBUS_HAVE_VIN | PMBUS_HAVE_PIN
 		  | PMBUS_HAVE_STATUS_INPUT;
 		if (config & ADM1275_VIN_VOUT_SELECT)
 			info->func[0] |=
 			  PMBUS_HAVE_VOUT | PMBUS_HAVE_STATUS_VOUT;
 		if (config & ADM1275_VRANGE) {
 			info->m[PSC_POWER] = 6043;
 			info->b[PSC_POWER] = 0;
 			info->R[PSC_POWER] = -2;
 		} else {
 			info->m[PSC_POWER] = 2115;
 			info->b[PSC_POWER] = 0;
 			info->R[PSC_POWER] = -1;
 		}
 		break;
 	}

 	return pmbus_do_probe(client, id, info);
 }

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

 module_i2c_driver(adm1275_driver);

 MODULE_AUTHOR("Guenter Roeck");
 MODULE_DESCRIPTION("PMBus driver for Analog Devices ADM1275 and compatibles");
 MODULE_LICENSE("GPL");
	/*
	* 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"

	enum chips { adm1275, adm1276 };

	#define ADM1275_PEAK_IOUT 0xd0
	#define ADM1275_PEAK_VIN 0xd1
	#define ADM1275_PEAK_VOUT 0xd2
	#define ADM1275_PMON_CONFIG 0xd4

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

	#define ADM1275_IOUT_WARN2_LIMIT 0xd7
	#define ADM1275_DEVICE_CONFIG 0xd8

	#define ADM1275_IOUT_WARN2_SELECT (1 << 4)

	#define ADM1276_PEAK_PIN 0xda

	#define ADM1275_MFR_STATUS_IOUT_WARN2 (1 << 0)

	struct adm1275_data {
	int id;
	bool have_oc_fault;
	struct pmbus_driver_info info;
	};

	#define to_adm1275_data(x) container_of(x, struct adm1275_data, info)

	static int adm1275_read_word_data(struct i2c_client *client, int page, int reg)
	{
	const struct pmbus_driver_info *info = pmbus_get_driver_info(client);
	const struct adm1275_data *data = to_adm1275_data(info);
	int ret = 0;

	if (page)
	return -ENXIO;

	switch (reg) {
	case PMBUS_IOUT_UC_FAULT_LIMIT:
	if (data->have_oc_fault) {
	ret = -ENXIO;
	break;
	}
	ret = pmbus_read_word_data(client, 0, ADM1275_IOUT_WARN2_LIMIT);
	break;
	case PMBUS_IOUT_OC_FAULT_LIMIT:
	if (!data->have_oc_fault) {
	ret = -ENXIO;
	break;
	}
	ret = pmbus_read_word_data(client, 0, ADM1275_IOUT_WARN2_LIMIT);
	break;
	case PMBUS_VIRT_READ_IOUT_MAX:
	ret = pmbus_read_word_data(client, 0, ADM1275_PEAK_IOUT);
	break;
	case PMBUS_VIRT_READ_VOUT_MAX:
	ret = pmbus_read_word_data(client, 0, ADM1275_PEAK_VOUT);
	break;
	case PMBUS_VIRT_READ_VIN_MAX:
	ret = pmbus_read_word_data(client, 0, ADM1275_PEAK_VIN);
	break;
	case PMBUS_VIRT_READ_PIN_MAX:
	if (data->id != adm1276) {
	ret = -ENXIO;
	break;
	}
	ret = pmbus_read_word_data(client, 0, ADM1276_PEAK_PIN);
	break;
	case PMBUS_VIRT_RESET_IOUT_HISTORY:
	case PMBUS_VIRT_RESET_VOUT_HISTORY:
	case PMBUS_VIRT_RESET_VIN_HISTORY:
	break;
	case PMBUS_VIRT_RESET_PIN_HISTORY:
	if (data->id != adm1276)
	ret = -ENXIO;
	break;
	default:
	ret = -ENODATA;
	break;
	}
	return ret;
	}

	static int adm1275_write_word_data(struct i2c_client *client, int page, int reg,
	u16 word)
	{
	int ret;

	if (page)
	return -ENXIO;

	switch (reg) {
	case PMBUS_IOUT_UC_FAULT_LIMIT:
	case PMBUS_IOUT_OC_FAULT_LIMIT:
	ret = pmbus_write_word_data(client, 0, ADM1275_IOUT_WARN2_LIMIT,
	word);
	break;
	case PMBUS_VIRT_RESET_IOUT_HISTORY:
	ret = pmbus_write_word_data(client, 0, ADM1275_PEAK_IOUT, 0);
	break;
	case PMBUS_VIRT_RESET_VOUT_HISTORY:
	ret = pmbus_write_word_data(client, 0, ADM1275_PEAK_VOUT, 0);
	break;
	case PMBUS_VIRT_RESET_VIN_HISTORY:
	ret = pmbus_write_word_data(client, 0, ADM1275_PEAK_VIN, 0);
	break;
	case PMBUS_VIRT_RESET_PIN_HISTORY:
	ret = pmbus_write_word_data(client, 0, ADM1276_PEAK_PIN, 0);
	break;
	default:
	ret = -ENODATA;
	break;
	}
	return ret;
	}

	static int adm1275_read_byte_data(struct i2c_client *client, int page, int reg)
	{
	const struct pmbus_driver_info *info = pmbus_get_driver_info(client);
	const struct adm1275_data *data = to_adm1275_data(info);
	int mfr_status, ret;

	if (page > 0)
	return -ENXIO;

	switch (reg) {
	case PMBUS_STATUS_IOUT:
	ret = pmbus_read_byte_data(client, page, PMBUS_STATUS_IOUT);
	if (ret < 0)
	break;
	mfr_status = pmbus_read_byte_data(client, page,
	PMBUS_STATUS_MFR_SPECIFIC);
	if (mfr_status < 0) {
	ret = mfr_status;
	break;
	}
	if (mfr_status & ADM1275_MFR_STATUS_IOUT_WARN2) {
	ret \|= data->have_oc_fault ?
	PB_IOUT_OC_FAULT : PB_IOUT_UC_FAULT;
	}
	break;
	default:
	ret = -ENODATA;
	break;
	}
	return ret;
	}

	static const struct i2c_device_id adm1275_id[] = {
	{ "adm1275", adm1275 },
	{ "adm1276", adm1276 },
	{ }
	};
	MODULE_DEVICE_TABLE(i2c, adm1275_id);

	static int adm1275_probe(struct i2c_client *client,
	const struct i2c_device_id *id)
	{
	u8 block_buffer[I2C_SMBUS_BLOCK_MAX + 1];
	int config, device_config;
	int ret;
	struct pmbus_driver_info *info;
	struct adm1275_data *data;
	const struct i2c_device_id *mid;

	if (!i2c_check_functionality(client->adapter,
	I2C_FUNC_SMBUS_READ_BYTE_DATA
	\| I2C_FUNC_SMBUS_BLOCK_DATA))
	return -ENODEV;

	ret = i2c_smbus_read_block_data(client, PMBUS_MFR_ID, block_buffer);
	if (ret < 0) {
	dev_err(&client->dev, "Failed to read Manufacturer ID\n");
	return ret;
	}
	if (ret != 3 \|\| strncmp(block_buffer, "ADI", 3)) {
	dev_err(&client->dev, "Unsupported Manufacturer ID\n");
	return -ENODEV;
	}

	ret = i2c_smbus_read_block_data(client, PMBUS_MFR_MODEL, block_buffer);
	if (ret < 0) {
	dev_err(&client->dev, "Failed to read Manufacturer Model\n");
	return ret;
	}
	for (mid = adm1275_id; mid->name[0]; mid++) {
	if (!strncasecmp(mid->name, block_buffer, strlen(mid->name)))
	break;
	}
	if (!mid->name[0]) {
	dev_err(&client->dev, "Unsupported device\n");
	return -ENODEV;
	}

	if (id->driver_data != mid->driver_data)
	dev_notice(&client->dev,
	"Device mismatch: Configured %s, detected %s\n",
	id->name, mid->name);

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

	device_config = i2c_smbus_read_byte_data(client, ADM1275_DEVICE_CONFIG);
	if (device_config < 0)
	return device_config;

	data = devm_kzalloc(&client->dev, sizeof(struct adm1275_data),
	GFP_KERNEL);
	if (!data)
	return -ENOMEM;

	data->id = mid->driver_data;

	info = &data->info;

	info->pages = 1;
	info->format[PSC_VOLTAGE_IN] = direct;
	info->format[PSC_VOLTAGE_OUT] = direct;
	info->format[PSC_CURRENT_OUT] = direct;
	info->m[PSC_CURRENT_OUT] = 807;
	info->b[PSC_CURRENT_OUT] = 20475;
	info->R[PSC_CURRENT_OUT] = -1;
	info->func[0] = PMBUS_HAVE_IOUT \| PMBUS_HAVE_STATUS_IOUT;

	info->read_word_data = adm1275_read_word_data;
	info->read_byte_data = adm1275_read_byte_data;
	info->write_word_data = adm1275_write_word_data;

	if (config & ADM1275_VRANGE) {
	info->m[PSC_VOLTAGE_IN] = 19199;
	info->b[PSC_VOLTAGE_IN] = 0;
	info->R[PSC_VOLTAGE_IN] = -2;
	info->m[PSC_VOLTAGE_OUT] = 19199;
	info->b[PSC_VOLTAGE_OUT] = 0;
	info->R[PSC_VOLTAGE_OUT] = -2;
	} else {
	info->m[PSC_VOLTAGE_IN] = 6720;
	info->b[PSC_VOLTAGE_IN] = 0;
	info->R[PSC_VOLTAGE_IN] = -1;
	info->m[PSC_VOLTAGE_OUT] = 6720;
	info->b[PSC_VOLTAGE_OUT] = 0;
	info->R[PSC_VOLTAGE_OUT] = -1;
	}

	if (device_config & ADM1275_IOUT_WARN2_SELECT)
	data->have_oc_fault = true;

	switch (data->id) {
	case adm1275:
	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;
	break;
	case adm1276:
	info->format[PSC_POWER] = direct;
	info->func[0] \|= PMBUS_HAVE_VIN \| PMBUS_HAVE_PIN
	\| PMBUS_HAVE_STATUS_INPUT;
	if (config & ADM1275_VIN_VOUT_SELECT)
	info->func[0] \|=
	PMBUS_HAVE_VOUT \| PMBUS_HAVE_STATUS_VOUT;
	if (config & ADM1275_VRANGE) {
	info->m[PSC_POWER] = 6043;
	info->b[PSC_POWER] = 0;
	info->R[PSC_POWER] = -2;
	} else {
	info->m[PSC_POWER] = 2115;
	info->b[PSC_POWER] = 0;
	info->R[PSC_POWER] = -1;
	}
	break;
	}

	return pmbus_do_probe(client, id, info);
	}

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

	module_i2c_driver(adm1275_driver);

	MODULE_AUTHOR("Guenter Roeck");
	MODULE_DESCRIPTION("PMBus driver for Analog Devices ADM1275 and compatibles");
	MODULE_LICENSE("GPL");