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1/*
2 * Hardware monitoring driver for Maxim MAX8688
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 MAX8688_MFR_VOUT_PEAK 0xd4
29#define MAX8688_MFR_IOUT_PEAK 0xd5
30#define MAX8688_MFR_TEMPERATURE_PEAK 0xd6
31#define MAX8688_MFG_STATUS 0xd8
32
33#define MAX8688_STATUS_OC_FAULT (1 << 4)
34#define MAX8688_STATUS_OV_FAULT (1 << 5)
35#define MAX8688_STATUS_OV_WARNING (1 << 8)
36#define MAX8688_STATUS_UV_FAULT (1 << 9)
37#define MAX8688_STATUS_UV_WARNING (1 << 10)
38#define MAX8688_STATUS_UC_FAULT (1 << 11)
39#define MAX8688_STATUS_OC_WARNING (1 << 12)
40#define MAX8688_STATUS_OT_FAULT (1 << 13)
41#define MAX8688_STATUS_OT_WARNING (1 << 14)
42
43static int max8688_read_word_data(struct i2c_client *client, int page, int reg)
44{
45 int ret;
46
47 if (page)
48 return -ENXIO;
49
50 switch (reg) {
51 case PMBUS_VIRT_READ_VOUT_MAX:
52 ret = pmbus_read_word_data(client, 0, MAX8688_MFR_VOUT_PEAK);
53 break;
54 case PMBUS_VIRT_READ_IOUT_MAX:
55 ret = pmbus_read_word_data(client, 0, MAX8688_MFR_IOUT_PEAK);
56 break;
57 case PMBUS_VIRT_READ_TEMP_MAX:
58 ret = pmbus_read_word_data(client, 0,
59 MAX8688_MFR_TEMPERATURE_PEAK);
60 break;
61 case PMBUS_VIRT_RESET_VOUT_HISTORY:
62 case PMBUS_VIRT_RESET_IOUT_HISTORY:
63 case PMBUS_VIRT_RESET_TEMP_HISTORY:
64 ret = 0;
65 break;
66 default:
67 ret = -ENODATA;
68 break;
69 }
70 return ret;
71}
72
73static int max8688_write_word_data(struct i2c_client *client, int page, int reg,
74 u16 word)
75{
76 int ret;
77
78 switch (reg) {
79 case PMBUS_VIRT_RESET_VOUT_HISTORY:
80 ret = pmbus_write_word_data(client, 0, MAX8688_MFR_VOUT_PEAK,
81 0);
82 break;
83 case PMBUS_VIRT_RESET_IOUT_HISTORY:
84 ret = pmbus_write_word_data(client, 0, MAX8688_MFR_IOUT_PEAK,
85 0);
86 break;
87 case PMBUS_VIRT_RESET_TEMP_HISTORY:
88 ret = pmbus_write_word_data(client, 0,
89 MAX8688_MFR_TEMPERATURE_PEAK,
90 0xffff);
91 break;
92 default:
93 ret = -ENODATA;
94 break;
95 }
96 return ret;
97}
98
99static int max8688_read_byte_data(struct i2c_client *client, int page, int reg)
100{
101 int ret = 0;
102 int mfg_status;
103
104 if (page > 0)
105 return -ENXIO;
106
107 switch (reg) {
108 case PMBUS_STATUS_VOUT:
109 mfg_status = pmbus_read_word_data(client, 0,
110 MAX8688_MFG_STATUS);
111 if (mfg_status < 0)
112 return mfg_status;
113 if (mfg_status & MAX8688_STATUS_UV_WARNING)
114 ret |= PB_VOLTAGE_UV_WARNING;
115 if (mfg_status & MAX8688_STATUS_UV_FAULT)
116 ret |= PB_VOLTAGE_UV_FAULT;
117 if (mfg_status & MAX8688_STATUS_OV_WARNING)
118 ret |= PB_VOLTAGE_OV_WARNING;
119 if (mfg_status & MAX8688_STATUS_OV_FAULT)
120 ret |= PB_VOLTAGE_OV_FAULT;
121 break;
122 case PMBUS_STATUS_IOUT:
123 mfg_status = pmbus_read_word_data(client, 0,
124 MAX8688_MFG_STATUS);
125 if (mfg_status < 0)
126 return mfg_status;
127 if (mfg_status & MAX8688_STATUS_UC_FAULT)
128 ret |= PB_IOUT_UC_FAULT;
129 if (mfg_status & MAX8688_STATUS_OC_WARNING)
130 ret |= PB_IOUT_OC_WARNING;
131 if (mfg_status & MAX8688_STATUS_OC_FAULT)
132 ret |= PB_IOUT_OC_FAULT;
133 break;
134 case PMBUS_STATUS_TEMPERATURE:
135 mfg_status = pmbus_read_word_data(client, 0,
136 MAX8688_MFG_STATUS);
137 if (mfg_status < 0)
138 return mfg_status;
139 if (mfg_status & MAX8688_STATUS_OT_WARNING)
140 ret |= PB_TEMP_OT_WARNING;
141 if (mfg_status & MAX8688_STATUS_OT_FAULT)
142 ret |= PB_TEMP_OT_FAULT;
143 break;
144 default:
145 ret = -ENODATA;
146 break;
147 }
148 return ret;
149}
150
151static struct pmbus_driver_info max8688_info = {
152 .pages = 1,
153 .format[PSC_VOLTAGE_IN] = direct,
154 .format[PSC_VOLTAGE_OUT] = direct,
155 .format[PSC_TEMPERATURE] = direct,
156 .format[PSC_CURRENT_OUT] = direct,
157 .m[PSC_VOLTAGE_IN] = 19995,
158 .b[PSC_VOLTAGE_IN] = 0,
159 .R[PSC_VOLTAGE_IN] = -1,
160 .m[PSC_VOLTAGE_OUT] = 19995,
161 .b[PSC_VOLTAGE_OUT] = 0,
162 .R[PSC_VOLTAGE_OUT] = -1,
163 .m[PSC_CURRENT_OUT] = 23109,
164 .b[PSC_CURRENT_OUT] = 0,
165 .R[PSC_CURRENT_OUT] = -2,
166 .m[PSC_TEMPERATURE] = -7612,
167 .b[PSC_TEMPERATURE] = 335,
168 .R[PSC_TEMPERATURE] = -3,
169 .func[0] = PMBUS_HAVE_VOUT | PMBUS_HAVE_IOUT | PMBUS_HAVE_TEMP
170 | PMBUS_HAVE_STATUS_VOUT | PMBUS_HAVE_STATUS_IOUT
171 | PMBUS_HAVE_STATUS_TEMP,
172 .read_byte_data = max8688_read_byte_data,
173 .read_word_data = max8688_read_word_data,
174 .write_word_data = max8688_write_word_data,
175};
176
177static int max8688_probe(struct i2c_client *client,
178 const struct i2c_device_id *id)
179{
180 return pmbus_do_probe(client, id, &max8688_info);
181}
182
183static const struct i2c_device_id max8688_id[] = {
184 {"max8688", 0},
185 { }
186};
187
188MODULE_DEVICE_TABLE(i2c, max8688_id);
189
190/* This is the driver that will be inserted */
191static struct i2c_driver max8688_driver = {
192 .driver = {
193 .name = "max8688",
194 },
195 .probe = max8688_probe,
196 .remove = pmbus_do_remove,
197 .id_table = max8688_id,
198};
199
200module_i2c_driver(max8688_driver);
201
202MODULE_AUTHOR("Guenter Roeck");
203MODULE_DESCRIPTION("PMBus driver for Maxim MAX8688");
204MODULE_LICENSE("GPL");