1/*
  2 * Hardware monitoring driver for Maxim MAX16064
  3 *
  4 * Copyright (c) 2011 Ericsson AB.
  5 *
  6 * This program is free software; you can redistribute it and/or modify
  7 * it under the terms of the GNU General Public License as published by
  8 * the Free Software Foundation; either version 2 of the License, or
  9 * (at your option) any later version.
 10 *
 11 * This program is distributed in the hope that it will be useful,
 12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
 14 * GNU General Public License for more details.
 15 *
 16 * You should have received a copy of the GNU General Public License
 17 * along with this program; if not, write to the Free Software
 18 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
 19 */
 20
 21#include <linux/kernel.h>
 22#include <linux/module.h>
 23#include <linux/init.h>
 24#include <linux/err.h>
 25#include <linux/i2c.h>
 26#include "pmbus.h"
 27
 28#define MAX16064_MFR_VOUT_PEAK		0xd4
 29#define MAX16064_MFR_TEMPERATURE_PEAK	0xd6
 30
 31static int max16064_read_word_data(struct i2c_client *client, int page, int reg)
 32{
 33	int ret;
 34
 35	switch (reg) {
 36	case PMBUS_VIRT_READ_VOUT_MAX:
 37		ret = pmbus_read_word_data(client, page,
 38					   MAX16064_MFR_VOUT_PEAK);
 39		break;
 40	case PMBUS_VIRT_READ_TEMP_MAX:
 41		ret = pmbus_read_word_data(client, page,
 42					   MAX16064_MFR_TEMPERATURE_PEAK);
 43		break;
 44	case PMBUS_VIRT_RESET_VOUT_HISTORY:
 45	case PMBUS_VIRT_RESET_TEMP_HISTORY:
 46		ret = 0;
 47		break;
 48	default:
 49		ret = -ENODATA;
 50		break;
 51	}
 52	return ret;
 53}
 54
 55static int max16064_write_word_data(struct i2c_client *client, int page,
 56				    int reg, u16 word)
 57{
 58	int ret;
 59
 60	switch (reg) {
 61	case PMBUS_VIRT_RESET_VOUT_HISTORY:
 62		ret = pmbus_write_word_data(client, page,
 63					    MAX16064_MFR_VOUT_PEAK, 0);
 64		break;
 65	case PMBUS_VIRT_RESET_TEMP_HISTORY:
 66		ret = pmbus_write_word_data(client, page,
 67					    MAX16064_MFR_TEMPERATURE_PEAK,
 68					    0xffff);
 69		break;
 70	default:
 71		ret = -ENODATA;
 72		break;
 73	}
 74	return ret;
 75}
 76
 77static struct pmbus_driver_info max16064_info = {
 78	.pages = 4,
 79	.format[PSC_VOLTAGE_IN] = direct,
 80	.format[PSC_VOLTAGE_OUT] = direct,
 81	.format[PSC_TEMPERATURE] = direct,
 82	.m[PSC_VOLTAGE_IN] = 19995,
 83	.b[PSC_VOLTAGE_IN] = 0,
 84	.R[PSC_VOLTAGE_IN] = -1,
 85	.m[PSC_VOLTAGE_OUT] = 19995,
 86	.b[PSC_VOLTAGE_OUT] = 0,
 87	.R[PSC_VOLTAGE_OUT] = -1,
 88	.m[PSC_TEMPERATURE] = -7612,
 89	.b[PSC_TEMPERATURE] = 335,
 90	.R[PSC_TEMPERATURE] = -3,
 91	.func[0] = PMBUS_HAVE_VOUT | PMBUS_HAVE_TEMP
 92		| PMBUS_HAVE_STATUS_VOUT | PMBUS_HAVE_STATUS_TEMP,
 93	.func[1] = PMBUS_HAVE_VOUT | PMBUS_HAVE_STATUS_VOUT,
 94	.func[2] = PMBUS_HAVE_VOUT | PMBUS_HAVE_STATUS_VOUT,
 95	.func[3] = PMBUS_HAVE_VOUT | PMBUS_HAVE_STATUS_VOUT,
 96	.read_word_data = max16064_read_word_data,
 97	.write_word_data = max16064_write_word_data,
 98};
 99
100static int max16064_probe(struct i2c_client *client,
101			  const struct i2c_device_id *id)
102{
103	return pmbus_do_probe(client, id, &max16064_info);
104}
105
106static const struct i2c_device_id max16064_id[] = {
107	{"max16064", 0},
108	{}
109};
110
111MODULE_DEVICE_TABLE(i2c, max16064_id);
112
113/* This is the driver that will be inserted */
114static struct i2c_driver max16064_driver = {
115	.driver = {
116		   .name = "max16064",
117		   },
118	.probe = max16064_probe,
119	.remove = pmbus_do_remove,
120	.id_table = max16064_id,
121};
122
123module_i2c_driver(max16064_driver);
124
125MODULE_AUTHOR("Guenter Roeck");
126MODULE_DESCRIPTION("PMBus driver for Maxim MAX16064");
127MODULE_LICENSE("GPL");