drivers/hwmon/pmbus/max34440.c - third_party/dump-capture-kernel - Git at Google

 /*
  * Hardware monitoring driver for Maxim MAX34440/MAX34441
  *
  * Copyright (c) 2011 Ericsson AB.
  * Copyright (c) 2012 Guenter Roeck
  *
  * 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/bitops.h>
 #include <linux/kernel.h>
 #include <linux/module.h>
 #include <linux/init.h>
 #include <linux/err.h>
 #include <linux/i2c.h>
 #include "pmbus.h"

 enum chips { max34440, max34441, max34446, max34460, max34461 };

 #define MAX34440_MFR_VOUT_PEAK		0xd4
 #define MAX34440_MFR_IOUT_PEAK		0xd5
 #define MAX34440_MFR_TEMPERATURE_PEAK	0xd6
 #define MAX34440_MFR_VOUT_MIN		0xd7

 #define MAX34446_MFR_POUT_PEAK		0xe0
 #define MAX34446_MFR_POUT_AVG		0xe1
 #define MAX34446_MFR_IOUT_AVG		0xe2
 #define MAX34446_MFR_TEMPERATURE_AVG	0xe3

 #define MAX34440_STATUS_OC_WARN		BIT(0)
 #define MAX34440_STATUS_OC_FAULT	BIT(1)
 #define MAX34440_STATUS_OT_FAULT	BIT(5)
 #define MAX34440_STATUS_OT_WARN		BIT(6)

 struct max34440_data {
 	int id;
 	struct pmbus_driver_info info;
 };

 #define to_max34440_data(x)  container_of(x, struct max34440_data, info)

 static int max34440_read_word_data(struct i2c_client *client, int page, int reg)
 {
 	int ret;
 	const struct pmbus_driver_info *info = pmbus_get_driver_info(client);
 	const struct max34440_data *data = to_max34440_data(info);

 	switch (reg) {
 	case PMBUS_VIRT_READ_VOUT_MIN:
 		ret = pmbus_read_word_data(client, page,
 					   MAX34440_MFR_VOUT_MIN);
 		break;
 	case PMBUS_VIRT_READ_VOUT_MAX:
 		ret = pmbus_read_word_data(client, page,
 					   MAX34440_MFR_VOUT_PEAK);
 		break;
 	case PMBUS_VIRT_READ_IOUT_AVG:
 		if (data->id != max34446)
 			return -ENXIO;
 		ret = pmbus_read_word_data(client, page,
 					   MAX34446_MFR_IOUT_AVG);
 		break;
 	case PMBUS_VIRT_READ_IOUT_MAX:
 		ret = pmbus_read_word_data(client, page,
 					   MAX34440_MFR_IOUT_PEAK);
 		break;
 	case PMBUS_VIRT_READ_POUT_AVG:
 		if (data->id != max34446)
 			return -ENXIO;
 		ret = pmbus_read_word_data(client, page,
 					   MAX34446_MFR_POUT_AVG);
 		break;
 	case PMBUS_VIRT_READ_POUT_MAX:
 		if (data->id != max34446)
 			return -ENXIO;
 		ret = pmbus_read_word_data(client, page,
 					   MAX34446_MFR_POUT_PEAK);
 		break;
 	case PMBUS_VIRT_READ_TEMP_AVG:
 		if (data->id != max34446 && data->id != max34460 &&
 		    data->id != max34461)
 			return -ENXIO;
 		ret = pmbus_read_word_data(client, page,
 					   MAX34446_MFR_TEMPERATURE_AVG);
 		break;
 	case PMBUS_VIRT_READ_TEMP_MAX:
 		ret = pmbus_read_word_data(client, page,
 					   MAX34440_MFR_TEMPERATURE_PEAK);
 		break;
 	case PMBUS_VIRT_RESET_POUT_HISTORY:
 		if (data->id != max34446)
 			return -ENXIO;
 		ret = 0;
 		break;
 	case PMBUS_VIRT_RESET_VOUT_HISTORY:
 	case PMBUS_VIRT_RESET_IOUT_HISTORY:
 	case PMBUS_VIRT_RESET_TEMP_HISTORY:
 		ret = 0;
 		break;
 	default:
 		ret = -ENODATA;
 		break;
 	}
 	return ret;
 }

 static int max34440_write_word_data(struct i2c_client *client, int page,
 				    int reg, u16 word)
 {
 	const struct pmbus_driver_info *info = pmbus_get_driver_info(client);
 	const struct max34440_data *data = to_max34440_data(info);
 	int ret;

 	switch (reg) {
 	case PMBUS_VIRT_RESET_POUT_HISTORY:
 		ret = pmbus_write_word_data(client, page,
 					    MAX34446_MFR_POUT_PEAK, 0);
 		if (ret)
 			break;
 		ret = pmbus_write_word_data(client, page,
 					    MAX34446_MFR_POUT_AVG, 0);
 		break;
 	case PMBUS_VIRT_RESET_VOUT_HISTORY:
 		ret = pmbus_write_word_data(client, page,
 					    MAX34440_MFR_VOUT_MIN, 0x7fff);
 		if (ret)
 			break;
 		ret = pmbus_write_word_data(client, page,
 					    MAX34440_MFR_VOUT_PEAK, 0);
 		break;
 	case PMBUS_VIRT_RESET_IOUT_HISTORY:
 		ret = pmbus_write_word_data(client, page,
 					    MAX34440_MFR_IOUT_PEAK, 0);
 		if (!ret && data->id == max34446)
 			ret = pmbus_write_word_data(client, page,
 					MAX34446_MFR_IOUT_AVG, 0);

 		break;
 	case PMBUS_VIRT_RESET_TEMP_HISTORY:
 		ret = pmbus_write_word_data(client, page,
 					    MAX34440_MFR_TEMPERATURE_PEAK,
 					    0x8000);
 		if (!ret && data->id == max34446)
 			ret = pmbus_write_word_data(client, page,
 					MAX34446_MFR_TEMPERATURE_AVG, 0);
 		break;
 	default:
 		ret = -ENODATA;
 		break;
 	}
 	return ret;
 }

 static int max34440_read_byte_data(struct i2c_client *client, int page, int reg)
 {
 	int ret = 0;
 	int mfg_status;

 	if (page >= 0) {
 		ret = pmbus_set_page(client, page);
 		if (ret < 0)
 			return ret;
 	}

 	switch (reg) {
 	case PMBUS_STATUS_IOUT:
 		mfg_status = pmbus_read_word_data(client, 0,
 						  PMBUS_STATUS_MFR_SPECIFIC);
 		if (mfg_status < 0)
 			return mfg_status;
 		if (mfg_status & MAX34440_STATUS_OC_WARN)
 			ret |= PB_IOUT_OC_WARNING;
 		if (mfg_status & MAX34440_STATUS_OC_FAULT)
 			ret |= PB_IOUT_OC_FAULT;
 		break;
 	case PMBUS_STATUS_TEMPERATURE:
 		mfg_status = pmbus_read_word_data(client, 0,
 						  PMBUS_STATUS_MFR_SPECIFIC);
 		if (mfg_status < 0)
 			return mfg_status;
 		if (mfg_status & MAX34440_STATUS_OT_WARN)
 			ret |= PB_TEMP_OT_WARNING;
 		if (mfg_status & MAX34440_STATUS_OT_FAULT)
 			ret |= PB_TEMP_OT_FAULT;
 		break;
 	default:
 		ret = -ENODATA;
 		break;
 	}
 	return ret;
 }

 static struct pmbus_driver_info max34440_info[] = {
 	[max34440] = {
 		.pages = 14,
 		.format[PSC_VOLTAGE_IN] = direct,
 		.format[PSC_VOLTAGE_OUT] = direct,
 		.format[PSC_TEMPERATURE] = direct,
 		.format[PSC_CURRENT_OUT] = direct,
 		.m[PSC_VOLTAGE_IN] = 1,
 		.b[PSC_VOLTAGE_IN] = 0,
 		.R[PSC_VOLTAGE_IN] = 3,	    /* R = 0 in datasheet reflects mV */
 		.m[PSC_VOLTAGE_OUT] = 1,
 		.b[PSC_VOLTAGE_OUT] = 0,
 		.R[PSC_VOLTAGE_OUT] = 3,    /* R = 0 in datasheet reflects mV */
 		.m[PSC_CURRENT_OUT] = 1,
 		.b[PSC_CURRENT_OUT] = 0,
 		.R[PSC_CURRENT_OUT] = 3,    /* R = 0 in datasheet reflects mA */
 		.m[PSC_TEMPERATURE] = 1,
 		.b[PSC_TEMPERATURE] = 0,
 		.R[PSC_TEMPERATURE] = 2,
 		.func[0] = PMBUS_HAVE_VOUT | PMBUS_HAVE_STATUS_VOUT
 		  | PMBUS_HAVE_IOUT | PMBUS_HAVE_STATUS_IOUT,
 		.func[1] = PMBUS_HAVE_VOUT | PMBUS_HAVE_STATUS_VOUT
 		  | PMBUS_HAVE_IOUT | PMBUS_HAVE_STATUS_IOUT,
 		.func[2] = PMBUS_HAVE_VOUT | PMBUS_HAVE_STATUS_VOUT
 		  | PMBUS_HAVE_IOUT | PMBUS_HAVE_STATUS_IOUT,
 		.func[3] = PMBUS_HAVE_VOUT | PMBUS_HAVE_STATUS_VOUT
 		  | PMBUS_HAVE_IOUT | PMBUS_HAVE_STATUS_IOUT,
 		.func[4] = PMBUS_HAVE_VOUT | PMBUS_HAVE_STATUS_VOUT
 		  | PMBUS_HAVE_IOUT | PMBUS_HAVE_STATUS_IOUT,
 		.func[5] = PMBUS_HAVE_VOUT | PMBUS_HAVE_STATUS_VOUT
 		  | PMBUS_HAVE_IOUT | PMBUS_HAVE_STATUS_IOUT,
 		.func[6] = PMBUS_HAVE_TEMP | PMBUS_HAVE_STATUS_TEMP,
 		.func[7] = PMBUS_HAVE_TEMP | PMBUS_HAVE_STATUS_TEMP,
 		.func[8] = PMBUS_HAVE_TEMP | PMBUS_HAVE_STATUS_TEMP,
 		.func[9] = PMBUS_HAVE_TEMP | PMBUS_HAVE_STATUS_TEMP,
 		.func[10] = PMBUS_HAVE_TEMP | PMBUS_HAVE_STATUS_TEMP,
 		.func[11] = PMBUS_HAVE_TEMP | PMBUS_HAVE_STATUS_TEMP,
 		.func[12] = PMBUS_HAVE_TEMP | PMBUS_HAVE_STATUS_TEMP,
 		.func[13] = PMBUS_HAVE_TEMP | PMBUS_HAVE_STATUS_TEMP,
 		.read_byte_data = max34440_read_byte_data,
 		.read_word_data = max34440_read_word_data,
 		.write_word_data = max34440_write_word_data,
 	},
 	[max34441] = {
 		.pages = 12,
 		.format[PSC_VOLTAGE_IN] = direct,
 		.format[PSC_VOLTAGE_OUT] = direct,
 		.format[PSC_TEMPERATURE] = direct,
 		.format[PSC_CURRENT_OUT] = direct,
 		.format[PSC_FAN] = direct,
 		.m[PSC_VOLTAGE_IN] = 1,
 		.b[PSC_VOLTAGE_IN] = 0,
 		.R[PSC_VOLTAGE_IN] = 3,
 		.m[PSC_VOLTAGE_OUT] = 1,
 		.b[PSC_VOLTAGE_OUT] = 0,
 		.R[PSC_VOLTAGE_OUT] = 3,
 		.m[PSC_CURRENT_OUT] = 1,
 		.b[PSC_CURRENT_OUT] = 0,
 		.R[PSC_CURRENT_OUT] = 3,
 		.m[PSC_TEMPERATURE] = 1,
 		.b[PSC_TEMPERATURE] = 0,
 		.R[PSC_TEMPERATURE] = 2,
 		.m[PSC_FAN] = 1,
 		.b[PSC_FAN] = 0,
 		.R[PSC_FAN] = 0,
 		.func[0] = PMBUS_HAVE_VOUT | PMBUS_HAVE_STATUS_VOUT
 		  | PMBUS_HAVE_IOUT | PMBUS_HAVE_STATUS_IOUT,
 		.func[1] = PMBUS_HAVE_VOUT | PMBUS_HAVE_STATUS_VOUT
 		  | PMBUS_HAVE_IOUT | PMBUS_HAVE_STATUS_IOUT,
 		.func[2] = PMBUS_HAVE_VOUT | PMBUS_HAVE_STATUS_VOUT
 		  | PMBUS_HAVE_IOUT | PMBUS_HAVE_STATUS_IOUT,
 		.func[3] = PMBUS_HAVE_VOUT | PMBUS_HAVE_STATUS_VOUT
 		  | PMBUS_HAVE_IOUT | PMBUS_HAVE_STATUS_IOUT,
 		.func[4] = PMBUS_HAVE_VOUT | PMBUS_HAVE_STATUS_VOUT
 		  | PMBUS_HAVE_IOUT | PMBUS_HAVE_STATUS_IOUT,
 		.func[5] = PMBUS_HAVE_FAN12 | PMBUS_HAVE_STATUS_FAN12,
 		.func[6] = PMBUS_HAVE_TEMP | PMBUS_HAVE_STATUS_TEMP,
 		.func[7] = PMBUS_HAVE_TEMP | PMBUS_HAVE_STATUS_TEMP,
 		.func[8] = PMBUS_HAVE_TEMP | PMBUS_HAVE_STATUS_TEMP,
 		.func[9] = PMBUS_HAVE_TEMP | PMBUS_HAVE_STATUS_TEMP,
 		.func[10] = PMBUS_HAVE_TEMP | PMBUS_HAVE_STATUS_TEMP,
 		.func[11] = PMBUS_HAVE_TEMP | PMBUS_HAVE_STATUS_TEMP,
 		.read_byte_data = max34440_read_byte_data,
 		.read_word_data = max34440_read_word_data,
 		.write_word_data = max34440_write_word_data,
 	},
 	[max34446] = {
 		.pages = 7,
 		.format[PSC_VOLTAGE_IN] = direct,
 		.format[PSC_VOLTAGE_OUT] = direct,
 		.format[PSC_TEMPERATURE] = direct,
 		.format[PSC_CURRENT_OUT] = direct,
 		.format[PSC_POWER] = direct,
 		.m[PSC_VOLTAGE_IN] = 1,
 		.b[PSC_VOLTAGE_IN] = 0,
 		.R[PSC_VOLTAGE_IN] = 3,
 		.m[PSC_VOLTAGE_OUT] = 1,
 		.b[PSC_VOLTAGE_OUT] = 0,
 		.R[PSC_VOLTAGE_OUT] = 3,
 		.m[PSC_CURRENT_OUT] = 1,
 		.b[PSC_CURRENT_OUT] = 0,
 		.R[PSC_CURRENT_OUT] = 3,
 		.m[PSC_POWER] = 1,
 		.b[PSC_POWER] = 0,
 		.R[PSC_POWER] = 3,
 		.m[PSC_TEMPERATURE] = 1,
 		.b[PSC_TEMPERATURE] = 0,
 		.R[PSC_TEMPERATURE] = 2,
 		.func[0] = PMBUS_HAVE_VOUT | PMBUS_HAVE_STATUS_VOUT
 		  | PMBUS_HAVE_IOUT | PMBUS_HAVE_STATUS_IOUT | PMBUS_HAVE_POUT,
 		.func[1] = PMBUS_HAVE_VOUT | PMBUS_HAVE_STATUS_VOUT
 		  | PMBUS_HAVE_IOUT | PMBUS_HAVE_STATUS_IOUT,
 		.func[2] = PMBUS_HAVE_VOUT | PMBUS_HAVE_STATUS_VOUT
 		  | PMBUS_HAVE_IOUT | PMBUS_HAVE_STATUS_IOUT | PMBUS_HAVE_POUT,
 		.func[3] = PMBUS_HAVE_VOUT | PMBUS_HAVE_STATUS_VOUT
 		  | PMBUS_HAVE_IOUT | PMBUS_HAVE_STATUS_IOUT,
 		.func[4] = PMBUS_HAVE_TEMP | PMBUS_HAVE_STATUS_TEMP,
 		.func[5] = PMBUS_HAVE_TEMP | PMBUS_HAVE_STATUS_TEMP,
 		.func[6] = PMBUS_HAVE_TEMP | PMBUS_HAVE_STATUS_TEMP,
 		.read_byte_data = max34440_read_byte_data,
 		.read_word_data = max34440_read_word_data,
 		.write_word_data = max34440_write_word_data,
 	},
 	[max34460] = {
 		.pages = 18,
 		.format[PSC_VOLTAGE_OUT] = direct,
 		.format[PSC_TEMPERATURE] = direct,
 		.m[PSC_VOLTAGE_OUT] = 1,
 		.b[PSC_VOLTAGE_OUT] = 0,
 		.R[PSC_VOLTAGE_OUT] = 3,
 		.m[PSC_TEMPERATURE] = 1,
 		.b[PSC_TEMPERATURE] = 0,
 		.R[PSC_TEMPERATURE] = 2,
 		.func[0] = PMBUS_HAVE_VOUT | PMBUS_HAVE_STATUS_VOUT,
 		.func[1] = PMBUS_HAVE_VOUT | PMBUS_HAVE_STATUS_VOUT,
 		.func[2] = PMBUS_HAVE_VOUT | PMBUS_HAVE_STATUS_VOUT,
 		.func[3] = PMBUS_HAVE_VOUT | PMBUS_HAVE_STATUS_VOUT,
 		.func[4] = PMBUS_HAVE_VOUT | PMBUS_HAVE_STATUS_VOUT,
 		.func[5] = PMBUS_HAVE_VOUT | PMBUS_HAVE_STATUS_VOUT,
 		.func[6] = PMBUS_HAVE_VOUT | PMBUS_HAVE_STATUS_VOUT,
 		.func[7] = PMBUS_HAVE_VOUT | PMBUS_HAVE_STATUS_VOUT,
 		.func[8] = PMBUS_HAVE_VOUT | PMBUS_HAVE_STATUS_VOUT,
 		.func[9] = PMBUS_HAVE_VOUT | PMBUS_HAVE_STATUS_VOUT,
 		.func[10] = PMBUS_HAVE_VOUT | PMBUS_HAVE_STATUS_VOUT,
 		.func[11] = PMBUS_HAVE_VOUT | PMBUS_HAVE_STATUS_VOUT,
 		.func[13] = PMBUS_HAVE_TEMP | PMBUS_HAVE_STATUS_TEMP,
 		.func[14] = PMBUS_HAVE_TEMP | PMBUS_HAVE_STATUS_TEMP,
 		.func[15] = PMBUS_HAVE_TEMP | PMBUS_HAVE_STATUS_TEMP,
 		.func[16] = PMBUS_HAVE_TEMP | PMBUS_HAVE_STATUS_TEMP,
 		.func[17] = PMBUS_HAVE_TEMP | PMBUS_HAVE_STATUS_TEMP,
 		.read_byte_data = max34440_read_byte_data,
 		.read_word_data = max34440_read_word_data,
 		.write_word_data = max34440_write_word_data,
 	},
 	[max34461] = {
 		.pages = 23,
 		.format[PSC_VOLTAGE_OUT] = direct,
 		.format[PSC_TEMPERATURE] = direct,
 		.m[PSC_VOLTAGE_OUT] = 1,
 		.b[PSC_VOLTAGE_OUT] = 0,
 		.R[PSC_VOLTAGE_OUT] = 3,
 		.m[PSC_TEMPERATURE] = 1,
 		.b[PSC_TEMPERATURE] = 0,
 		.R[PSC_TEMPERATURE] = 2,
 		.func[0] = PMBUS_HAVE_VOUT | PMBUS_HAVE_STATUS_VOUT,
 		.func[1] = PMBUS_HAVE_VOUT | PMBUS_HAVE_STATUS_VOUT,
 		.func[2] = PMBUS_HAVE_VOUT | PMBUS_HAVE_STATUS_VOUT,
 		.func[3] = PMBUS_HAVE_VOUT | PMBUS_HAVE_STATUS_VOUT,
 		.func[4] = PMBUS_HAVE_VOUT | PMBUS_HAVE_STATUS_VOUT,
 		.func[5] = PMBUS_HAVE_VOUT | PMBUS_HAVE_STATUS_VOUT,
 		.func[6] = PMBUS_HAVE_VOUT | PMBUS_HAVE_STATUS_VOUT,
 		.func[7] = PMBUS_HAVE_VOUT | PMBUS_HAVE_STATUS_VOUT,
 		.func[8] = PMBUS_HAVE_VOUT | PMBUS_HAVE_STATUS_VOUT,
 		.func[9] = PMBUS_HAVE_VOUT | PMBUS_HAVE_STATUS_VOUT,
 		.func[10] = PMBUS_HAVE_VOUT | PMBUS_HAVE_STATUS_VOUT,
 		.func[11] = PMBUS_HAVE_VOUT | PMBUS_HAVE_STATUS_VOUT,
 		.func[12] = PMBUS_HAVE_VOUT | PMBUS_HAVE_STATUS_VOUT,
 		.func[13] = PMBUS_HAVE_VOUT | PMBUS_HAVE_STATUS_VOUT,
 		.func[14] = PMBUS_HAVE_VOUT | PMBUS_HAVE_STATUS_VOUT,
 		.func[15] = PMBUS_HAVE_VOUT | PMBUS_HAVE_STATUS_VOUT,
 		/* page 16 is reserved */
 		.func[17] = PMBUS_HAVE_TEMP | PMBUS_HAVE_STATUS_TEMP,
 		.func[18] = PMBUS_HAVE_TEMP | PMBUS_HAVE_STATUS_TEMP,
 		.func[19] = PMBUS_HAVE_TEMP | PMBUS_HAVE_STATUS_TEMP,
 		.func[20] = PMBUS_HAVE_TEMP | PMBUS_HAVE_STATUS_TEMP,
 		.func[21] = PMBUS_HAVE_TEMP | PMBUS_HAVE_STATUS_TEMP,
 		.read_byte_data = max34440_read_byte_data,
 		.read_word_data = max34440_read_word_data,
 		.write_word_data = max34440_write_word_data,
 	},
 };

 static int max34440_probe(struct i2c_client *client,
 			  const struct i2c_device_id *id)
 {
 	struct max34440_data *data;

 	data = devm_kzalloc(&client->dev, sizeof(struct max34440_data),
 			    GFP_KERNEL);
 	if (!data)
 		return -ENOMEM;
 	data->id = id->driver_data;
 	data->info = max34440_info[id->driver_data];

 	return pmbus_do_probe(client, id, &data->info);
 }

 static const struct i2c_device_id max34440_id[] = {
 	{"max34440", max34440},
 	{"max34441", max34441},
 	{"max34446", max34446},
 	{"max34460", max34460},
 	{"max34461", max34461},
 	{}
 };
 MODULE_DEVICE_TABLE(i2c, max34440_id);

 /* This is the driver that will be inserted */
 static struct i2c_driver max34440_driver = {
 	.driver = {
 		   .name = "max34440",
 		   },
 	.probe = max34440_probe,
 	.remove = pmbus_do_remove,
 	.id_table = max34440_id,
 };

 module_i2c_driver(max34440_driver);

 MODULE_AUTHOR("Guenter Roeck");
 MODULE_DESCRIPTION("PMBus driver for Maxim MAX34440/MAX34441");
 MODULE_LICENSE("GPL");
	/*
	* Hardware monitoring driver for Maxim MAX34440/MAX34441
	*
	* Copyright (c) 2011 Ericsson AB.
	* Copyright (c) 2012 Guenter Roeck
	*
	* 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/bitops.h>
	#include <linux/kernel.h>
	#include <linux/module.h>
	#include <linux/init.h>
	#include <linux/err.h>
	#include <linux/i2c.h>
	#include "pmbus.h"

	enum chips { max34440, max34441, max34446, max34460, max34461 };

	#define MAX34440_MFR_VOUT_PEAK 0xd4
	#define MAX34440_MFR_IOUT_PEAK 0xd5
	#define MAX34440_MFR_TEMPERATURE_PEAK 0xd6
	#define MAX34440_MFR_VOUT_MIN 0xd7

	#define MAX34446_MFR_POUT_PEAK 0xe0
	#define MAX34446_MFR_POUT_AVG 0xe1
	#define MAX34446_MFR_IOUT_AVG 0xe2
	#define MAX34446_MFR_TEMPERATURE_AVG 0xe3

	#define MAX34440_STATUS_OC_WARN BIT(0)
	#define MAX34440_STATUS_OC_FAULT BIT(1)
	#define MAX34440_STATUS_OT_FAULT BIT(5)
	#define MAX34440_STATUS_OT_WARN BIT(6)

	struct max34440_data {
	int id;
	struct pmbus_driver_info info;
	};

	#define to_max34440_data(x) container_of(x, struct max34440_data, info)

	static int max34440_read_word_data(struct i2c_client *client, int page, int reg)
	{
	int ret;
	const struct pmbus_driver_info *info = pmbus_get_driver_info(client);
	const struct max34440_data *data = to_max34440_data(info);

	switch (reg) {
	case PMBUS_VIRT_READ_VOUT_MIN:
	ret = pmbus_read_word_data(client, page,
	MAX34440_MFR_VOUT_MIN);
	break;
	case PMBUS_VIRT_READ_VOUT_MAX:
	ret = pmbus_read_word_data(client, page,
	MAX34440_MFR_VOUT_PEAK);
	break;
	case PMBUS_VIRT_READ_IOUT_AVG:
	if (data->id != max34446)
	return -ENXIO;
	ret = pmbus_read_word_data(client, page,
	MAX34446_MFR_IOUT_AVG);
	break;
	case PMBUS_VIRT_READ_IOUT_MAX:
	ret = pmbus_read_word_data(client, page,
	MAX34440_MFR_IOUT_PEAK);
	break;
	case PMBUS_VIRT_READ_POUT_AVG:
	if (data->id != max34446)
	return -ENXIO;
	ret = pmbus_read_word_data(client, page,
	MAX34446_MFR_POUT_AVG);
	break;
	case PMBUS_VIRT_READ_POUT_MAX:
	if (data->id != max34446)
	return -ENXIO;
	ret = pmbus_read_word_data(client, page,
	MAX34446_MFR_POUT_PEAK);
	break;
	case PMBUS_VIRT_READ_TEMP_AVG:
	if (data->id != max34446 && data->id != max34460 &&
	data->id != max34461)
	return -ENXIO;
	ret = pmbus_read_word_data(client, page,
	MAX34446_MFR_TEMPERATURE_AVG);
	break;
	case PMBUS_VIRT_READ_TEMP_MAX:
	ret = pmbus_read_word_data(client, page,
	MAX34440_MFR_TEMPERATURE_PEAK);
	break;
	case PMBUS_VIRT_RESET_POUT_HISTORY:
	if (data->id != max34446)
	return -ENXIO;
	ret = 0;
	break;
	case PMBUS_VIRT_RESET_VOUT_HISTORY:
	case PMBUS_VIRT_RESET_IOUT_HISTORY:
	case PMBUS_VIRT_RESET_TEMP_HISTORY:
	ret = 0;
	break;
	default:
	ret = -ENODATA;
	break;
	}
	return ret;
	}

	static int max34440_write_word_data(struct i2c_client *client, int page,
	int reg, u16 word)
	{
	const struct pmbus_driver_info *info = pmbus_get_driver_info(client);
	const struct max34440_data *data = to_max34440_data(info);
	int ret;

	switch (reg) {
	case PMBUS_VIRT_RESET_POUT_HISTORY:
	ret = pmbus_write_word_data(client, page,
	MAX34446_MFR_POUT_PEAK, 0);
	if (ret)
	break;
	ret = pmbus_write_word_data(client, page,
	MAX34446_MFR_POUT_AVG, 0);
	break;
	case PMBUS_VIRT_RESET_VOUT_HISTORY:
	ret = pmbus_write_word_data(client, page,
	MAX34440_MFR_VOUT_MIN, 0x7fff);
	if (ret)
	break;
	ret = pmbus_write_word_data(client, page,
	MAX34440_MFR_VOUT_PEAK, 0);
	break;
	case PMBUS_VIRT_RESET_IOUT_HISTORY:
	ret = pmbus_write_word_data(client, page,
	MAX34440_MFR_IOUT_PEAK, 0);
	if (!ret && data->id == max34446)
	ret = pmbus_write_word_data(client, page,
	MAX34446_MFR_IOUT_AVG, 0);

	break;
	case PMBUS_VIRT_RESET_TEMP_HISTORY:
	ret = pmbus_write_word_data(client, page,
	MAX34440_MFR_TEMPERATURE_PEAK,
	0x8000);
	if (!ret && data->id == max34446)
	ret = pmbus_write_word_data(client, page,
	MAX34446_MFR_TEMPERATURE_AVG, 0);
	break;
	default:
	ret = -ENODATA;
	break;
	}
	return ret;
	}

	static int max34440_read_byte_data(struct i2c_client *client, int page, int reg)
	{
	int ret = 0;
	int mfg_status;

	if (page >= 0) {
	ret = pmbus_set_page(client, page);
	if (ret < 0)
	return ret;
	}

	switch (reg) {
	case PMBUS_STATUS_IOUT:
	mfg_status = pmbus_read_word_data(client, 0,
	PMBUS_STATUS_MFR_SPECIFIC);
	if (mfg_status < 0)
	return mfg_status;
	if (mfg_status & MAX34440_STATUS_OC_WARN)
	ret \|= PB_IOUT_OC_WARNING;
	if (mfg_status & MAX34440_STATUS_OC_FAULT)
	ret \|= PB_IOUT_OC_FAULT;
	break;
	case PMBUS_STATUS_TEMPERATURE:
	mfg_status = pmbus_read_word_data(client, 0,
	PMBUS_STATUS_MFR_SPECIFIC);
	if (mfg_status < 0)
	return mfg_status;
	if (mfg_status & MAX34440_STATUS_OT_WARN)
	ret \|= PB_TEMP_OT_WARNING;
	if (mfg_status & MAX34440_STATUS_OT_FAULT)
	ret \|= PB_TEMP_OT_FAULT;
	break;
	default:
	ret = -ENODATA;
	break;
	}
	return ret;
	}

	static struct pmbus_driver_info max34440_info[] = {
	[max34440] = {
	.pages = 14,
	.format[PSC_VOLTAGE_IN] = direct,
	.format[PSC_VOLTAGE_OUT] = direct,
	.format[PSC_TEMPERATURE] = direct,
	.format[PSC_CURRENT_OUT] = direct,
	.m[PSC_VOLTAGE_IN] = 1,
	.b[PSC_VOLTAGE_IN] = 0,
	.R[PSC_VOLTAGE_IN] = 3, /* R = 0 in datasheet reflects mV */
	.m[PSC_VOLTAGE_OUT] = 1,
	.b[PSC_VOLTAGE_OUT] = 0,
	.R[PSC_VOLTAGE_OUT] = 3, /* R = 0 in datasheet reflects mV */
	.m[PSC_CURRENT_OUT] = 1,
	.b[PSC_CURRENT_OUT] = 0,
	.R[PSC_CURRENT_OUT] = 3, /* R = 0 in datasheet reflects mA */
	.m[PSC_TEMPERATURE] = 1,
	.b[PSC_TEMPERATURE] = 0,
	.R[PSC_TEMPERATURE] = 2,
	.func[0] = PMBUS_HAVE_VOUT \| PMBUS_HAVE_STATUS_VOUT
	\| PMBUS_HAVE_IOUT \| PMBUS_HAVE_STATUS_IOUT,
	.func[1] = PMBUS_HAVE_VOUT \| PMBUS_HAVE_STATUS_VOUT
	\| PMBUS_HAVE_IOUT \| PMBUS_HAVE_STATUS_IOUT,
	.func[2] = PMBUS_HAVE_VOUT \| PMBUS_HAVE_STATUS_VOUT
	\| PMBUS_HAVE_IOUT \| PMBUS_HAVE_STATUS_IOUT,
	.func[3] = PMBUS_HAVE_VOUT \| PMBUS_HAVE_STATUS_VOUT
	\| PMBUS_HAVE_IOUT \| PMBUS_HAVE_STATUS_IOUT,
	.func[4] = PMBUS_HAVE_VOUT \| PMBUS_HAVE_STATUS_VOUT
	\| PMBUS_HAVE_IOUT \| PMBUS_HAVE_STATUS_IOUT,
	.func[5] = PMBUS_HAVE_VOUT \| PMBUS_HAVE_STATUS_VOUT
	\| PMBUS_HAVE_IOUT \| PMBUS_HAVE_STATUS_IOUT,
	.func[6] = PMBUS_HAVE_TEMP \| PMBUS_HAVE_STATUS_TEMP,
	.func[7] = PMBUS_HAVE_TEMP \| PMBUS_HAVE_STATUS_TEMP,
	.func[8] = PMBUS_HAVE_TEMP \| PMBUS_HAVE_STATUS_TEMP,
	.func[9] = PMBUS_HAVE_TEMP \| PMBUS_HAVE_STATUS_TEMP,
	.func[10] = PMBUS_HAVE_TEMP \| PMBUS_HAVE_STATUS_TEMP,
	.func[11] = PMBUS_HAVE_TEMP \| PMBUS_HAVE_STATUS_TEMP,
	.func[12] = PMBUS_HAVE_TEMP \| PMBUS_HAVE_STATUS_TEMP,
	.func[13] = PMBUS_HAVE_TEMP \| PMBUS_HAVE_STATUS_TEMP,
	.read_byte_data = max34440_read_byte_data,
	.read_word_data = max34440_read_word_data,
	.write_word_data = max34440_write_word_data,
	},
	[max34441] = {
	.pages = 12,
	.format[PSC_VOLTAGE_IN] = direct,
	.format[PSC_VOLTAGE_OUT] = direct,
	.format[PSC_TEMPERATURE] = direct,
	.format[PSC_CURRENT_OUT] = direct,
	.format[PSC_FAN] = direct,
	.m[PSC_VOLTAGE_IN] = 1,
	.b[PSC_VOLTAGE_IN] = 0,
	.R[PSC_VOLTAGE_IN] = 3,
	.m[PSC_VOLTAGE_OUT] = 1,
	.b[PSC_VOLTAGE_OUT] = 0,
	.R[PSC_VOLTAGE_OUT] = 3,
	.m[PSC_CURRENT_OUT] = 1,
	.b[PSC_CURRENT_OUT] = 0,
	.R[PSC_CURRENT_OUT] = 3,
	.m[PSC_TEMPERATURE] = 1,
	.b[PSC_TEMPERATURE] = 0,
	.R[PSC_TEMPERATURE] = 2,
	.m[PSC_FAN] = 1,
	.b[PSC_FAN] = 0,
	.R[PSC_FAN] = 0,
	.func[0] = PMBUS_HAVE_VOUT \| PMBUS_HAVE_STATUS_VOUT
	\| PMBUS_HAVE_IOUT \| PMBUS_HAVE_STATUS_IOUT,
	.func[1] = PMBUS_HAVE_VOUT \| PMBUS_HAVE_STATUS_VOUT
	\| PMBUS_HAVE_IOUT \| PMBUS_HAVE_STATUS_IOUT,
	.func[2] = PMBUS_HAVE_VOUT \| PMBUS_HAVE_STATUS_VOUT
	\| PMBUS_HAVE_IOUT \| PMBUS_HAVE_STATUS_IOUT,
	.func[3] = PMBUS_HAVE_VOUT \| PMBUS_HAVE_STATUS_VOUT
	\| PMBUS_HAVE_IOUT \| PMBUS_HAVE_STATUS_IOUT,
	.func[4] = PMBUS_HAVE_VOUT \| PMBUS_HAVE_STATUS_VOUT
	\| PMBUS_HAVE_IOUT \| PMBUS_HAVE_STATUS_IOUT,
	.func[5] = PMBUS_HAVE_FAN12 \| PMBUS_HAVE_STATUS_FAN12,
	.func[6] = PMBUS_HAVE_TEMP \| PMBUS_HAVE_STATUS_TEMP,
	.func[7] = PMBUS_HAVE_TEMP \| PMBUS_HAVE_STATUS_TEMP,
	.func[8] = PMBUS_HAVE_TEMP \| PMBUS_HAVE_STATUS_TEMP,
	.func[9] = PMBUS_HAVE_TEMP \| PMBUS_HAVE_STATUS_TEMP,
	.func[10] = PMBUS_HAVE_TEMP \| PMBUS_HAVE_STATUS_TEMP,
	.func[11] = PMBUS_HAVE_TEMP \| PMBUS_HAVE_STATUS_TEMP,
	.read_byte_data = max34440_read_byte_data,
	.read_word_data = max34440_read_word_data,
	.write_word_data = max34440_write_word_data,
	},
	[max34446] = {
	.pages = 7,
	.format[PSC_VOLTAGE_IN] = direct,
	.format[PSC_VOLTAGE_OUT] = direct,
	.format[PSC_TEMPERATURE] = direct,
	.format[PSC_CURRENT_OUT] = direct,
	.format[PSC_POWER] = direct,
	.m[PSC_VOLTAGE_IN] = 1,
	.b[PSC_VOLTAGE_IN] = 0,
	.R[PSC_VOLTAGE_IN] = 3,
	.m[PSC_VOLTAGE_OUT] = 1,
	.b[PSC_VOLTAGE_OUT] = 0,
	.R[PSC_VOLTAGE_OUT] = 3,
	.m[PSC_CURRENT_OUT] = 1,
	.b[PSC_CURRENT_OUT] = 0,
	.R[PSC_CURRENT_OUT] = 3,
	.m[PSC_POWER] = 1,
	.b[PSC_POWER] = 0,
	.R[PSC_POWER] = 3,
	.m[PSC_TEMPERATURE] = 1,
	.b[PSC_TEMPERATURE] = 0,
	.R[PSC_TEMPERATURE] = 2,
	.func[0] = PMBUS_HAVE_VOUT \| PMBUS_HAVE_STATUS_VOUT
	\| PMBUS_HAVE_IOUT \| PMBUS_HAVE_STATUS_IOUT \| PMBUS_HAVE_POUT,
	.func[1] = PMBUS_HAVE_VOUT \| PMBUS_HAVE_STATUS_VOUT
	\| PMBUS_HAVE_IOUT \| PMBUS_HAVE_STATUS_IOUT,
	.func[2] = PMBUS_HAVE_VOUT \| PMBUS_HAVE_STATUS_VOUT
	\| PMBUS_HAVE_IOUT \| PMBUS_HAVE_STATUS_IOUT \| PMBUS_HAVE_POUT,
	.func[3] = PMBUS_HAVE_VOUT \| PMBUS_HAVE_STATUS_VOUT
	\| PMBUS_HAVE_IOUT \| PMBUS_HAVE_STATUS_IOUT,
	.func[4] = PMBUS_HAVE_TEMP \| PMBUS_HAVE_STATUS_TEMP,
	.func[5] = PMBUS_HAVE_TEMP \| PMBUS_HAVE_STATUS_TEMP,
	.func[6] = PMBUS_HAVE_TEMP \| PMBUS_HAVE_STATUS_TEMP,
	.read_byte_data = max34440_read_byte_data,
	.read_word_data = max34440_read_word_data,
	.write_word_data = max34440_write_word_data,
	},
	[max34460] = {
	.pages = 18,
	.format[PSC_VOLTAGE_OUT] = direct,
	.format[PSC_TEMPERATURE] = direct,
	.m[PSC_VOLTAGE_OUT] = 1,
	.b[PSC_VOLTAGE_OUT] = 0,
	.R[PSC_VOLTAGE_OUT] = 3,
	.m[PSC_TEMPERATURE] = 1,
	.b[PSC_TEMPERATURE] = 0,
	.R[PSC_TEMPERATURE] = 2,
	.func[0] = PMBUS_HAVE_VOUT \| PMBUS_HAVE_STATUS_VOUT,
	.func[1] = PMBUS_HAVE_VOUT \| PMBUS_HAVE_STATUS_VOUT,
	.func[2] = PMBUS_HAVE_VOUT \| PMBUS_HAVE_STATUS_VOUT,
	.func[3] = PMBUS_HAVE_VOUT \| PMBUS_HAVE_STATUS_VOUT,
	.func[4] = PMBUS_HAVE_VOUT \| PMBUS_HAVE_STATUS_VOUT,
	.func[5] = PMBUS_HAVE_VOUT \| PMBUS_HAVE_STATUS_VOUT,
	.func[6] = PMBUS_HAVE_VOUT \| PMBUS_HAVE_STATUS_VOUT,
	.func[7] = PMBUS_HAVE_VOUT \| PMBUS_HAVE_STATUS_VOUT,
	.func[8] = PMBUS_HAVE_VOUT \| PMBUS_HAVE_STATUS_VOUT,
	.func[9] = PMBUS_HAVE_VOUT \| PMBUS_HAVE_STATUS_VOUT,
	.func[10] = PMBUS_HAVE_VOUT \| PMBUS_HAVE_STATUS_VOUT,
	.func[11] = PMBUS_HAVE_VOUT \| PMBUS_HAVE_STATUS_VOUT,
	.func[13] = PMBUS_HAVE_TEMP \| PMBUS_HAVE_STATUS_TEMP,
	.func[14] = PMBUS_HAVE_TEMP \| PMBUS_HAVE_STATUS_TEMP,
	.func[15] = PMBUS_HAVE_TEMP \| PMBUS_HAVE_STATUS_TEMP,
	.func[16] = PMBUS_HAVE_TEMP \| PMBUS_HAVE_STATUS_TEMP,
	.func[17] = PMBUS_HAVE_TEMP \| PMBUS_HAVE_STATUS_TEMP,
	.read_byte_data = max34440_read_byte_data,
	.read_word_data = max34440_read_word_data,
	.write_word_data = max34440_write_word_data,
	},
	[max34461] = {
	.pages = 23,
	.format[PSC_VOLTAGE_OUT] = direct,
	.format[PSC_TEMPERATURE] = direct,
	.m[PSC_VOLTAGE_OUT] = 1,
	.b[PSC_VOLTAGE_OUT] = 0,
	.R[PSC_VOLTAGE_OUT] = 3,
	.m[PSC_TEMPERATURE] = 1,
	.b[PSC_TEMPERATURE] = 0,
	.R[PSC_TEMPERATURE] = 2,
	.func[0] = PMBUS_HAVE_VOUT \| PMBUS_HAVE_STATUS_VOUT,
	.func[1] = PMBUS_HAVE_VOUT \| PMBUS_HAVE_STATUS_VOUT,
	.func[2] = PMBUS_HAVE_VOUT \| PMBUS_HAVE_STATUS_VOUT,
	.func[3] = PMBUS_HAVE_VOUT \| PMBUS_HAVE_STATUS_VOUT,
	.func[4] = PMBUS_HAVE_VOUT \| PMBUS_HAVE_STATUS_VOUT,
	.func[5] = PMBUS_HAVE_VOUT \| PMBUS_HAVE_STATUS_VOUT,
	.func[6] = PMBUS_HAVE_VOUT \| PMBUS_HAVE_STATUS_VOUT,
	.func[7] = PMBUS_HAVE_VOUT \| PMBUS_HAVE_STATUS_VOUT,
	.func[8] = PMBUS_HAVE_VOUT \| PMBUS_HAVE_STATUS_VOUT,
	.func[9] = PMBUS_HAVE_VOUT \| PMBUS_HAVE_STATUS_VOUT,
	.func[10] = PMBUS_HAVE_VOUT \| PMBUS_HAVE_STATUS_VOUT,
	.func[11] = PMBUS_HAVE_VOUT \| PMBUS_HAVE_STATUS_VOUT,
	.func[12] = PMBUS_HAVE_VOUT \| PMBUS_HAVE_STATUS_VOUT,
	.func[13] = PMBUS_HAVE_VOUT \| PMBUS_HAVE_STATUS_VOUT,
	.func[14] = PMBUS_HAVE_VOUT \| PMBUS_HAVE_STATUS_VOUT,
	.func[15] = PMBUS_HAVE_VOUT \| PMBUS_HAVE_STATUS_VOUT,
	/* page 16 is reserved */
	.func[17] = PMBUS_HAVE_TEMP \| PMBUS_HAVE_STATUS_TEMP,
	.func[18] = PMBUS_HAVE_TEMP \| PMBUS_HAVE_STATUS_TEMP,
	.func[19] = PMBUS_HAVE_TEMP \| PMBUS_HAVE_STATUS_TEMP,
	.func[20] = PMBUS_HAVE_TEMP \| PMBUS_HAVE_STATUS_TEMP,
	.func[21] = PMBUS_HAVE_TEMP \| PMBUS_HAVE_STATUS_TEMP,
	.read_byte_data = max34440_read_byte_data,
	.read_word_data = max34440_read_word_data,
	.write_word_data = max34440_write_word_data,
	},
	};

	static int max34440_probe(struct i2c_client *client,
	const struct i2c_device_id *id)
	{
	struct max34440_data *data;

	data = devm_kzalloc(&client->dev, sizeof(struct max34440_data),
	GFP_KERNEL);
	if (!data)
	return -ENOMEM;
	data->id = id->driver_data;
	data->info = max34440_info[id->driver_data];

	return pmbus_do_probe(client, id, &data->info);
	}

	static const struct i2c_device_id max34440_id[] = {
	{"max34440", max34440},
	{"max34441", max34441},
	{"max34446", max34446},
	{"max34460", max34460},
	{"max34461", max34461},
	{}
	};
	MODULE_DEVICE_TABLE(i2c, max34440_id);

	/* This is the driver that will be inserted */
	static struct i2c_driver max34440_driver = {
	.driver = {
	.name = "max34440",
	},
	.probe = max34440_probe,
	.remove = pmbus_do_remove,
	.id_table = max34440_id,
	};

	module_i2c_driver(max34440_driver);

	MODULE_AUTHOR("Guenter Roeck");
	MODULE_DESCRIPTION("PMBus driver for Maxim MAX34440/MAX34441");
	MODULE_LICENSE("GPL");