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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 | ||
70e94b27 GR |
28 | #define MAX8688_MFR_VOUT_PEAK 0xd4 |
29 | #define MAX8688_MFR_IOUT_PEAK 0xd5 | |
30 | #define MAX8688_MFR_TEMPERATURE_PEAK 0xd6 | |
8ea3238b GR |
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 | ||
70e94b27 GR |
43 | static int max8688_read_word_data(struct i2c_client *client, int page, int reg) |
44 | { | |
45 | int ret; | |
46 | ||
47 | if (page) | |
179144a0 | 48 | return -ENXIO; |
70e94b27 GR |
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 | ||
73 | static 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 | ||
2cfa6aed | 99 | static int max8688_read_byte_data(struct i2c_client *client, int page, int reg) |
8ea3238b GR |
100 | { |
101 | int ret = 0; | |
102 | int mfg_status; | |
103 | ||
da8e48ab | 104 | if (page > 0) |
179144a0 | 105 | return -ENXIO; |
8ea3238b GR |
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 | ||
151 | static struct pmbus_driver_info max8688_info = { | |
152 | .pages = 1, | |
1061d851 GR |
153 | .format[PSC_VOLTAGE_IN] = direct, |
154 | .format[PSC_VOLTAGE_OUT] = direct, | |
155 | .format[PSC_TEMPERATURE] = direct, | |
156 | .format[PSC_CURRENT_OUT] = direct, | |
8ea3238b GR |
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, | |
2cfa6aed | 172 | .read_byte_data = max8688_read_byte_data, |
70e94b27 GR |
173 | .read_word_data = max8688_read_word_data, |
174 | .write_word_data = max8688_write_word_data, | |
8ea3238b GR |
175 | }; |
176 | ||
177 | static 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 | ||
183 | static int max8688_remove(struct i2c_client *client) | |
184 | { | |
866cf12a GR |
185 | pmbus_do_remove(client); |
186 | return 0; | |
8ea3238b GR |
187 | } |
188 | ||
189 | static const struct i2c_device_id max8688_id[] = { | |
190 | {"max8688", 0}, | |
191 | { } | |
192 | }; | |
193 | ||
194 | MODULE_DEVICE_TABLE(i2c, max8688_id); | |
195 | ||
196 | /* This is the driver that will be inserted */ | |
197 | static struct i2c_driver max8688_driver = { | |
198 | .driver = { | |
199 | .name = "max8688", | |
200 | }, | |
201 | .probe = max8688_probe, | |
202 | .remove = max8688_remove, | |
203 | .id_table = max8688_id, | |
204 | }; | |
205 | ||
206 | static int __init max8688_init(void) | |
207 | { | |
208 | return i2c_add_driver(&max8688_driver); | |
209 | } | |
210 | ||
211 | static void __exit max8688_exit(void) | |
212 | { | |
213 | i2c_del_driver(&max8688_driver); | |
214 | } | |
215 | ||
216 | MODULE_AUTHOR("Guenter Roeck"); | |
217 | MODULE_DESCRIPTION("PMBus driver for Maxim MAX8688"); | |
218 | MODULE_LICENSE("GPL"); | |
219 | module_init(max8688_init); | |
220 | module_exit(max8688_exit); |