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8ea3238b GR |
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_MFG_STATUS 0xd8 | |
29 | ||
30 | #define MAX8688_STATUS_OC_FAULT (1 << 4) | |
31 | #define MAX8688_STATUS_OV_FAULT (1 << 5) | |
32 | #define MAX8688_STATUS_OV_WARNING (1 << 8) | |
33 | #define MAX8688_STATUS_UV_FAULT (1 << 9) | |
34 | #define MAX8688_STATUS_UV_WARNING (1 << 10) | |
35 | #define MAX8688_STATUS_UC_FAULT (1 << 11) | |
36 | #define MAX8688_STATUS_OC_WARNING (1 << 12) | |
37 | #define MAX8688_STATUS_OT_FAULT (1 << 13) | |
38 | #define MAX8688_STATUS_OT_WARNING (1 << 14) | |
39 | ||
2cfa6aed | 40 | static int max8688_read_byte_data(struct i2c_client *client, int page, int reg) |
8ea3238b GR |
41 | { |
42 | int ret = 0; | |
43 | int mfg_status; | |
44 | ||
45 | if (page) | |
46 | return -EINVAL; | |
47 | ||
48 | switch (reg) { | |
49 | case PMBUS_STATUS_VOUT: | |
50 | mfg_status = pmbus_read_word_data(client, 0, | |
51 | MAX8688_MFG_STATUS); | |
52 | if (mfg_status < 0) | |
53 | return mfg_status; | |
54 | if (mfg_status & MAX8688_STATUS_UV_WARNING) | |
55 | ret |= PB_VOLTAGE_UV_WARNING; | |
56 | if (mfg_status & MAX8688_STATUS_UV_FAULT) | |
57 | ret |= PB_VOLTAGE_UV_FAULT; | |
58 | if (mfg_status & MAX8688_STATUS_OV_WARNING) | |
59 | ret |= PB_VOLTAGE_OV_WARNING; | |
60 | if (mfg_status & MAX8688_STATUS_OV_FAULT) | |
61 | ret |= PB_VOLTAGE_OV_FAULT; | |
62 | break; | |
63 | case PMBUS_STATUS_IOUT: | |
64 | mfg_status = pmbus_read_word_data(client, 0, | |
65 | MAX8688_MFG_STATUS); | |
66 | if (mfg_status < 0) | |
67 | return mfg_status; | |
68 | if (mfg_status & MAX8688_STATUS_UC_FAULT) | |
69 | ret |= PB_IOUT_UC_FAULT; | |
70 | if (mfg_status & MAX8688_STATUS_OC_WARNING) | |
71 | ret |= PB_IOUT_OC_WARNING; | |
72 | if (mfg_status & MAX8688_STATUS_OC_FAULT) | |
73 | ret |= PB_IOUT_OC_FAULT; | |
74 | break; | |
75 | case PMBUS_STATUS_TEMPERATURE: | |
76 | mfg_status = pmbus_read_word_data(client, 0, | |
77 | MAX8688_MFG_STATUS); | |
78 | if (mfg_status < 0) | |
79 | return mfg_status; | |
80 | if (mfg_status & MAX8688_STATUS_OT_WARNING) | |
81 | ret |= PB_TEMP_OT_WARNING; | |
82 | if (mfg_status & MAX8688_STATUS_OT_FAULT) | |
83 | ret |= PB_TEMP_OT_FAULT; | |
84 | break; | |
85 | default: | |
86 | ret = -ENODATA; | |
87 | break; | |
88 | } | |
89 | return ret; | |
90 | } | |
91 | ||
92 | static struct pmbus_driver_info max8688_info = { | |
93 | .pages = 1, | |
94 | .direct[PSC_VOLTAGE_IN] = true, | |
95 | .direct[PSC_VOLTAGE_OUT] = true, | |
96 | .direct[PSC_TEMPERATURE] = true, | |
97 | .direct[PSC_CURRENT_OUT] = true, | |
98 | .m[PSC_VOLTAGE_IN] = 19995, | |
99 | .b[PSC_VOLTAGE_IN] = 0, | |
100 | .R[PSC_VOLTAGE_IN] = -1, | |
101 | .m[PSC_VOLTAGE_OUT] = 19995, | |
102 | .b[PSC_VOLTAGE_OUT] = 0, | |
103 | .R[PSC_VOLTAGE_OUT] = -1, | |
104 | .m[PSC_CURRENT_OUT] = 23109, | |
105 | .b[PSC_CURRENT_OUT] = 0, | |
106 | .R[PSC_CURRENT_OUT] = -2, | |
107 | .m[PSC_TEMPERATURE] = -7612, | |
108 | .b[PSC_TEMPERATURE] = 335, | |
109 | .R[PSC_TEMPERATURE] = -3, | |
110 | .func[0] = PMBUS_HAVE_VOUT | PMBUS_HAVE_IOUT | PMBUS_HAVE_TEMP | |
111 | | PMBUS_HAVE_STATUS_VOUT | PMBUS_HAVE_STATUS_IOUT | |
112 | | PMBUS_HAVE_STATUS_TEMP, | |
2cfa6aed | 113 | .read_byte_data = max8688_read_byte_data, |
8ea3238b GR |
114 | }; |
115 | ||
116 | static int max8688_probe(struct i2c_client *client, | |
117 | const struct i2c_device_id *id) | |
118 | { | |
119 | return pmbus_do_probe(client, id, &max8688_info); | |
120 | } | |
121 | ||
122 | static int max8688_remove(struct i2c_client *client) | |
123 | { | |
124 | return pmbus_do_remove(client); | |
125 | } | |
126 | ||
127 | static const struct i2c_device_id max8688_id[] = { | |
128 | {"max8688", 0}, | |
129 | { } | |
130 | }; | |
131 | ||
132 | MODULE_DEVICE_TABLE(i2c, max8688_id); | |
133 | ||
134 | /* This is the driver that will be inserted */ | |
135 | static struct i2c_driver max8688_driver = { | |
136 | .driver = { | |
137 | .name = "max8688", | |
138 | }, | |
139 | .probe = max8688_probe, | |
140 | .remove = max8688_remove, | |
141 | .id_table = max8688_id, | |
142 | }; | |
143 | ||
144 | static int __init max8688_init(void) | |
145 | { | |
146 | return i2c_add_driver(&max8688_driver); | |
147 | } | |
148 | ||
149 | static void __exit max8688_exit(void) | |
150 | { | |
151 | i2c_del_driver(&max8688_driver); | |
152 | } | |
153 | ||
154 | MODULE_AUTHOR("Guenter Roeck"); | |
155 | MODULE_DESCRIPTION("PMBus driver for Maxim MAX8688"); | |
156 | MODULE_LICENSE("GPL"); | |
157 | module_init(max8688_init); | |
158 | module_exit(max8688_exit); |