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");
128