1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3 * Hardware monitoring driver for Maxim MAX16064
4 *
5 * Copyright (c) 2011 Ericsson AB.
6 */
7
8 #include <linux/kernel.h>
9 #include <linux/module.h>
10 #include <linux/init.h>
11 #include <linux/err.h>
12 #include <linux/i2c.h>
13 #include "pmbus.h"
14
15 #define MAX16064_MFR_VOUT_PEAK 0xd4
16 #define MAX16064_MFR_TEMPERATURE_PEAK 0xd6
17
max16064_read_word_data(struct i2c_client * client,int page,int phase,int reg)18 static int max16064_read_word_data(struct i2c_client *client, int page,
19 int phase, int reg)
20 {
21 int ret;
22
23 switch (reg) {
24 case PMBUS_VIRT_READ_VOUT_MAX:
25 ret = pmbus_read_word_data(client, page, phase,
26 MAX16064_MFR_VOUT_PEAK);
27 break;
28 case PMBUS_VIRT_READ_TEMP_MAX:
29 ret = pmbus_read_word_data(client, page, phase,
30 MAX16064_MFR_TEMPERATURE_PEAK);
31 break;
32 case PMBUS_VIRT_RESET_VOUT_HISTORY:
33 case PMBUS_VIRT_RESET_TEMP_HISTORY:
34 ret = 0;
35 break;
36 default:
37 ret = -ENODATA;
38 break;
39 }
40 return ret;
41 }
42
max16064_write_word_data(struct i2c_client * client,int page,int reg,u16 word)43 static int max16064_write_word_data(struct i2c_client *client, int page,
44 int reg, u16 word)
45 {
46 int ret;
47
48 switch (reg) {
49 case PMBUS_VIRT_RESET_VOUT_HISTORY:
50 ret = pmbus_write_word_data(client, page,
51 MAX16064_MFR_VOUT_PEAK, 0);
52 break;
53 case PMBUS_VIRT_RESET_TEMP_HISTORY:
54 ret = pmbus_write_word_data(client, page,
55 MAX16064_MFR_TEMPERATURE_PEAK,
56 0xffff);
57 break;
58 default:
59 ret = -ENODATA;
60 break;
61 }
62 return ret;
63 }
64
65 static struct pmbus_driver_info max16064_info = {
66 .pages = 4,
67 .format[PSC_VOLTAGE_IN] = direct,
68 .format[PSC_VOLTAGE_OUT] = direct,
69 .format[PSC_TEMPERATURE] = direct,
70 .m[PSC_VOLTAGE_IN] = 19995,
71 .b[PSC_VOLTAGE_IN] = 0,
72 .R[PSC_VOLTAGE_IN] = -1,
73 .m[PSC_VOLTAGE_OUT] = 19995,
74 .b[PSC_VOLTAGE_OUT] = 0,
75 .R[PSC_VOLTAGE_OUT] = -1,
76 .m[PSC_TEMPERATURE] = -7612,
77 .b[PSC_TEMPERATURE] = 335,
78 .R[PSC_TEMPERATURE] = -3,
79 .func[0] = PMBUS_HAVE_VOUT | PMBUS_HAVE_TEMP
80 | PMBUS_HAVE_STATUS_VOUT | PMBUS_HAVE_STATUS_TEMP,
81 .func[1] = PMBUS_HAVE_VOUT | PMBUS_HAVE_STATUS_VOUT,
82 .func[2] = PMBUS_HAVE_VOUT | PMBUS_HAVE_STATUS_VOUT,
83 .func[3] = PMBUS_HAVE_VOUT | PMBUS_HAVE_STATUS_VOUT,
84 .read_word_data = max16064_read_word_data,
85 .write_word_data = max16064_write_word_data,
86 };
87
max16064_probe(struct i2c_client * client)88 static int max16064_probe(struct i2c_client *client)
89 {
90 return pmbus_do_probe(client, &max16064_info);
91 }
92
93 static const struct i2c_device_id max16064_id[] = {
94 {"max16064", 0},
95 {}
96 };
97
98 MODULE_DEVICE_TABLE(i2c, max16064_id);
99
100 /* This is the driver that will be inserted */
101 static struct i2c_driver max16064_driver = {
102 .driver = {
103 .name = "max16064",
104 },
105 .probe_new = max16064_probe,
106 .id_table = max16064_id,
107 };
108
109 module_i2c_driver(max16064_driver);
110
111 MODULE_AUTHOR("Guenter Roeck");
112 MODULE_DESCRIPTION("PMBus driver for Maxim MAX16064");
113 MODULE_LICENSE("GPL");
114 MODULE_IMPORT_NS(PMBUS);
115