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dcb7d066 GR |
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 | ||
8ebed854 GR |
28 | #define MAX16064_MFR_VOUT_PEAK 0xd4 |
29 | #define MAX16064_MFR_TEMPERATURE_PEAK 0xd6 | |
30 | ||
31 | static 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 | ||
55 | static 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 | ||
dcb7d066 GR |
77 | static struct pmbus_driver_info max16064_info = { |
78 | .pages = 4, | |
1061d851 GR |
79 | .format[PSC_VOLTAGE_IN] = direct, |
80 | .format[PSC_VOLTAGE_OUT] = direct, | |
81 | .format[PSC_TEMPERATURE] = direct, | |
dcb7d066 GR |
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, | |
8ebed854 GR |
96 | .read_word_data = max16064_read_word_data, |
97 | .write_word_data = max16064_write_word_data, | |
dcb7d066 GR |
98 | }; |
99 | ||
100 | static 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 | ||
106 | static int max16064_remove(struct i2c_client *client) | |
107 | { | |
866cf12a GR |
108 | pmbus_do_remove(client); |
109 | return 0; | |
dcb7d066 GR |
110 | } |
111 | ||
112 | static const struct i2c_device_id max16064_id[] = { | |
113 | {"max16064", 0}, | |
114 | {} | |
115 | }; | |
116 | ||
117 | MODULE_DEVICE_TABLE(i2c, max16064_id); | |
118 | ||
119 | /* This is the driver that will be inserted */ | |
120 | static struct i2c_driver max16064_driver = { | |
121 | .driver = { | |
122 | .name = "max16064", | |
123 | }, | |
124 | .probe = max16064_probe, | |
125 | .remove = max16064_remove, | |
126 | .id_table = max16064_id, | |
127 | }; | |
128 | ||
129 | static int __init max16064_init(void) | |
130 | { | |
131 | return i2c_add_driver(&max16064_driver); | |
132 | } | |
133 | ||
134 | static void __exit max16064_exit(void) | |
135 | { | |
136 | i2c_del_driver(&max16064_driver); | |
137 | } | |
138 | ||
139 | MODULE_AUTHOR("Guenter Roeck"); | |
140 | MODULE_DESCRIPTION("PMBus driver for Maxim MAX16064"); | |
141 | MODULE_LICENSE("GPL"); | |
142 | module_init(max16064_init); | |
143 | module_exit(max16064_exit); |