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1// SPDX-License-Identifier: GPL-2.0-or-later
2/*
3 * Hardware monitoring driver for Maxim MAX8688
4 *
5 * Copyright (c) 2011 Ericsson AB.
6 */
7
8#include <linux/bitops.h>
9#include <linux/kernel.h>
10#include <linux/module.h>
11#include <linux/init.h>
12#include <linux/err.h>
13#include <linux/i2c.h>
14#include "pmbus.h"
15
16#define MAX8688_MFR_VOUT_PEAK 0xd4
17#define MAX8688_MFR_IOUT_PEAK 0xd5
18#define MAX8688_MFR_TEMPERATURE_PEAK 0xd6
19#define MAX8688_MFG_STATUS 0xd8
20
21#define MAX8688_STATUS_OC_FAULT BIT(4)
22#define MAX8688_STATUS_OV_FAULT BIT(5)
23#define MAX8688_STATUS_OV_WARNING BIT(8)
24#define MAX8688_STATUS_UV_FAULT BIT(9)
25#define MAX8688_STATUS_UV_WARNING BIT(10)
26#define MAX8688_STATUS_UC_FAULT BIT(11)
27#define MAX8688_STATUS_OC_WARNING BIT(12)
28#define MAX8688_STATUS_OT_FAULT BIT(13)
29#define MAX8688_STATUS_OT_WARNING BIT(14)
30
31static int max8688_read_word_data(struct i2c_client *client, int page, int reg)
32{
33 int ret;
34
35 if (page > 0)
36 return -ENXIO;
37
38 switch (reg) {
39 case PMBUS_VIRT_READ_VOUT_MAX:
40 ret = pmbus_read_word_data(client, 0, MAX8688_MFR_VOUT_PEAK);
41 break;
42 case PMBUS_VIRT_READ_IOUT_MAX:
43 ret = pmbus_read_word_data(client, 0, MAX8688_MFR_IOUT_PEAK);
44 break;
45 case PMBUS_VIRT_READ_TEMP_MAX:
46 ret = pmbus_read_word_data(client, 0,
47 MAX8688_MFR_TEMPERATURE_PEAK);
48 break;
49 case PMBUS_VIRT_RESET_VOUT_HISTORY:
50 case PMBUS_VIRT_RESET_IOUT_HISTORY:
51 case PMBUS_VIRT_RESET_TEMP_HISTORY:
52 ret = 0;
53 break;
54 default:
55 ret = -ENODATA;
56 break;
57 }
58 return ret;
59}
60
61static int max8688_write_word_data(struct i2c_client *client, int page, int reg,
62 u16 word)
63{
64 int ret;
65
66 switch (reg) {
67 case PMBUS_VIRT_RESET_VOUT_HISTORY:
68 ret = pmbus_write_word_data(client, 0, MAX8688_MFR_VOUT_PEAK,
69 0);
70 break;
71 case PMBUS_VIRT_RESET_IOUT_HISTORY:
72 ret = pmbus_write_word_data(client, 0, MAX8688_MFR_IOUT_PEAK,
73 0);
74 break;
75 case PMBUS_VIRT_RESET_TEMP_HISTORY:
76 ret = pmbus_write_word_data(client, 0,
77 MAX8688_MFR_TEMPERATURE_PEAK,
78 0xffff);
79 break;
80 default:
81 ret = -ENODATA;
82 break;
83 }
84 return ret;
85}
86
87static int max8688_read_byte_data(struct i2c_client *client, int page, int reg)
88{
89 int ret = 0;
90 int mfg_status;
91
92 if (page > 0)
93 return -ENXIO;
94
95 switch (reg) {
96 case PMBUS_STATUS_VOUT:
97 mfg_status = pmbus_read_word_data(client, 0,
98 MAX8688_MFG_STATUS);
99 if (mfg_status < 0)
100 return mfg_status;
101 if (mfg_status & MAX8688_STATUS_UV_WARNING)
102 ret |= PB_VOLTAGE_UV_WARNING;
103 if (mfg_status & MAX8688_STATUS_UV_FAULT)
104 ret |= PB_VOLTAGE_UV_FAULT;
105 if (mfg_status & MAX8688_STATUS_OV_WARNING)
106 ret |= PB_VOLTAGE_OV_WARNING;
107 if (mfg_status & MAX8688_STATUS_OV_FAULT)
108 ret |= PB_VOLTAGE_OV_FAULT;
109 break;
110 case PMBUS_STATUS_IOUT:
111 mfg_status = pmbus_read_word_data(client, 0,
112 MAX8688_MFG_STATUS);
113 if (mfg_status < 0)
114 return mfg_status;
115 if (mfg_status & MAX8688_STATUS_UC_FAULT)
116 ret |= PB_IOUT_UC_FAULT;
117 if (mfg_status & MAX8688_STATUS_OC_WARNING)
118 ret |= PB_IOUT_OC_WARNING;
119 if (mfg_status & MAX8688_STATUS_OC_FAULT)
120 ret |= PB_IOUT_OC_FAULT;
121 break;
122 case PMBUS_STATUS_TEMPERATURE:
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_OT_WARNING)
128 ret |= PB_TEMP_OT_WARNING;
129 if (mfg_status & MAX8688_STATUS_OT_FAULT)
130 ret |= PB_TEMP_OT_FAULT;
131 break;
132 default:
133 ret = -ENODATA;
134 break;
135 }
136 return ret;
137}
138
139static struct pmbus_driver_info max8688_info = {
140 .pages = 1,
141 .format[PSC_VOLTAGE_IN] = direct,
142 .format[PSC_VOLTAGE_OUT] = direct,
143 .format[PSC_TEMPERATURE] = direct,
144 .format[PSC_CURRENT_OUT] = direct,
145 .m[PSC_VOLTAGE_IN] = 19995,
146 .b[PSC_VOLTAGE_IN] = 0,
147 .R[PSC_VOLTAGE_IN] = -1,
148 .m[PSC_VOLTAGE_OUT] = 19995,
149 .b[PSC_VOLTAGE_OUT] = 0,
150 .R[PSC_VOLTAGE_OUT] = -1,
151 .m[PSC_CURRENT_OUT] = 23109,
152 .b[PSC_CURRENT_OUT] = 0,
153 .R[PSC_CURRENT_OUT] = -2,
154 .m[PSC_TEMPERATURE] = -7612,
155 .b[PSC_TEMPERATURE] = 335,
156 .R[PSC_TEMPERATURE] = -3,
157 .func[0] = PMBUS_HAVE_VOUT | PMBUS_HAVE_IOUT | PMBUS_HAVE_TEMP
158 | PMBUS_HAVE_STATUS_VOUT | PMBUS_HAVE_STATUS_IOUT
159 | PMBUS_HAVE_STATUS_TEMP,
160 .read_byte_data = max8688_read_byte_data,
161 .read_word_data = max8688_read_word_data,
162 .write_word_data = max8688_write_word_data,
163};
164
165static int max8688_probe(struct i2c_client *client,
166 const struct i2c_device_id *id)
167{
168 return pmbus_do_probe(client, id, &max8688_info);
169}
170
171static const struct i2c_device_id max8688_id[] = {
172 {"max8688", 0},
173 { }
174};
175
176MODULE_DEVICE_TABLE(i2c, max8688_id);
177
178/* This is the driver that will be inserted */
179static struct i2c_driver max8688_driver = {
180 .driver = {
181 .name = "max8688",
182 },
183 .probe = max8688_probe,
184 .remove = pmbus_do_remove,
185 .id_table = max8688_id,
186};
187
188module_i2c_driver(max8688_driver);
189
190MODULE_AUTHOR("Guenter Roeck");
191MODULE_DESCRIPTION("PMBus driver for Maxim MAX8688");
192MODULE_LICENSE("GPL");