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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 | ||
2c052d42 | 21 | #include <linux/bitops.h> |
8ea3238b GR |
22 | #include <linux/kernel.h> |
23 | #include <linux/module.h> | |
24 | #include <linux/init.h> | |
25 | #include <linux/err.h> | |
26 | #include <linux/i2c.h> | |
27 | #include "pmbus.h" | |
28 | ||
70e94b27 GR |
29 | #define MAX8688_MFR_VOUT_PEAK 0xd4 |
30 | #define MAX8688_MFR_IOUT_PEAK 0xd5 | |
31 | #define MAX8688_MFR_TEMPERATURE_PEAK 0xd6 | |
8ea3238b GR |
32 | #define MAX8688_MFG_STATUS 0xd8 |
33 | ||
2c052d42 GR |
34 | #define MAX8688_STATUS_OC_FAULT BIT(4) |
35 | #define MAX8688_STATUS_OV_FAULT BIT(5) | |
36 | #define MAX8688_STATUS_OV_WARNING BIT(8) | |
37 | #define MAX8688_STATUS_UV_FAULT BIT(9) | |
38 | #define MAX8688_STATUS_UV_WARNING BIT(10) | |
39 | #define MAX8688_STATUS_UC_FAULT BIT(11) | |
40 | #define MAX8688_STATUS_OC_WARNING BIT(12) | |
41 | #define MAX8688_STATUS_OT_FAULT BIT(13) | |
42 | #define MAX8688_STATUS_OT_WARNING BIT(14) | |
8ea3238b | 43 | |
70e94b27 GR |
44 | static int max8688_read_word_data(struct i2c_client *client, int page, int reg) |
45 | { | |
46 | int ret; | |
47 | ||
0ae5908e | 48 | if (page > 0) |
179144a0 | 49 | return -ENXIO; |
70e94b27 GR |
50 | |
51 | switch (reg) { | |
52 | case PMBUS_VIRT_READ_VOUT_MAX: | |
53 | ret = pmbus_read_word_data(client, 0, MAX8688_MFR_VOUT_PEAK); | |
54 | break; | |
55 | case PMBUS_VIRT_READ_IOUT_MAX: | |
56 | ret = pmbus_read_word_data(client, 0, MAX8688_MFR_IOUT_PEAK); | |
57 | break; | |
58 | case PMBUS_VIRT_READ_TEMP_MAX: | |
59 | ret = pmbus_read_word_data(client, 0, | |
60 | MAX8688_MFR_TEMPERATURE_PEAK); | |
61 | break; | |
62 | case PMBUS_VIRT_RESET_VOUT_HISTORY: | |
63 | case PMBUS_VIRT_RESET_IOUT_HISTORY: | |
64 | case PMBUS_VIRT_RESET_TEMP_HISTORY: | |
65 | ret = 0; | |
66 | break; | |
67 | default: | |
68 | ret = -ENODATA; | |
69 | break; | |
70 | } | |
71 | return ret; | |
72 | } | |
73 | ||
74 | static int max8688_write_word_data(struct i2c_client *client, int page, int reg, | |
75 | u16 word) | |
76 | { | |
77 | int ret; | |
78 | ||
79 | switch (reg) { | |
80 | case PMBUS_VIRT_RESET_VOUT_HISTORY: | |
81 | ret = pmbus_write_word_data(client, 0, MAX8688_MFR_VOUT_PEAK, | |
82 | 0); | |
83 | break; | |
84 | case PMBUS_VIRT_RESET_IOUT_HISTORY: | |
85 | ret = pmbus_write_word_data(client, 0, MAX8688_MFR_IOUT_PEAK, | |
86 | 0); | |
87 | break; | |
88 | case PMBUS_VIRT_RESET_TEMP_HISTORY: | |
89 | ret = pmbus_write_word_data(client, 0, | |
90 | MAX8688_MFR_TEMPERATURE_PEAK, | |
91 | 0xffff); | |
92 | break; | |
93 | default: | |
94 | ret = -ENODATA; | |
95 | break; | |
96 | } | |
97 | return ret; | |
98 | } | |
99 | ||
2cfa6aed | 100 | static int max8688_read_byte_data(struct i2c_client *client, int page, int reg) |
8ea3238b GR |
101 | { |
102 | int ret = 0; | |
103 | int mfg_status; | |
104 | ||
da8e48ab | 105 | if (page > 0) |
179144a0 | 106 | return -ENXIO; |
8ea3238b GR |
107 | |
108 | switch (reg) { | |
109 | case PMBUS_STATUS_VOUT: | |
110 | mfg_status = pmbus_read_word_data(client, 0, | |
111 | MAX8688_MFG_STATUS); | |
112 | if (mfg_status < 0) | |
113 | return mfg_status; | |
114 | if (mfg_status & MAX8688_STATUS_UV_WARNING) | |
115 | ret |= PB_VOLTAGE_UV_WARNING; | |
116 | if (mfg_status & MAX8688_STATUS_UV_FAULT) | |
117 | ret |= PB_VOLTAGE_UV_FAULT; | |
118 | if (mfg_status & MAX8688_STATUS_OV_WARNING) | |
119 | ret |= PB_VOLTAGE_OV_WARNING; | |
120 | if (mfg_status & MAX8688_STATUS_OV_FAULT) | |
121 | ret |= PB_VOLTAGE_OV_FAULT; | |
122 | break; | |
123 | case PMBUS_STATUS_IOUT: | |
124 | mfg_status = pmbus_read_word_data(client, 0, | |
125 | MAX8688_MFG_STATUS); | |
126 | if (mfg_status < 0) | |
127 | return mfg_status; | |
128 | if (mfg_status & MAX8688_STATUS_UC_FAULT) | |
129 | ret |= PB_IOUT_UC_FAULT; | |
130 | if (mfg_status & MAX8688_STATUS_OC_WARNING) | |
131 | ret |= PB_IOUT_OC_WARNING; | |
132 | if (mfg_status & MAX8688_STATUS_OC_FAULT) | |
133 | ret |= PB_IOUT_OC_FAULT; | |
134 | break; | |
135 | case PMBUS_STATUS_TEMPERATURE: | |
136 | mfg_status = pmbus_read_word_data(client, 0, | |
137 | MAX8688_MFG_STATUS); | |
138 | if (mfg_status < 0) | |
139 | return mfg_status; | |
140 | if (mfg_status & MAX8688_STATUS_OT_WARNING) | |
141 | ret |= PB_TEMP_OT_WARNING; | |
142 | if (mfg_status & MAX8688_STATUS_OT_FAULT) | |
143 | ret |= PB_TEMP_OT_FAULT; | |
144 | break; | |
145 | default: | |
146 | ret = -ENODATA; | |
147 | break; | |
148 | } | |
149 | return ret; | |
150 | } | |
151 | ||
152 | static struct pmbus_driver_info max8688_info = { | |
153 | .pages = 1, | |
1061d851 GR |
154 | .format[PSC_VOLTAGE_IN] = direct, |
155 | .format[PSC_VOLTAGE_OUT] = direct, | |
156 | .format[PSC_TEMPERATURE] = direct, | |
157 | .format[PSC_CURRENT_OUT] = direct, | |
8ea3238b GR |
158 | .m[PSC_VOLTAGE_IN] = 19995, |
159 | .b[PSC_VOLTAGE_IN] = 0, | |
160 | .R[PSC_VOLTAGE_IN] = -1, | |
161 | .m[PSC_VOLTAGE_OUT] = 19995, | |
162 | .b[PSC_VOLTAGE_OUT] = 0, | |
163 | .R[PSC_VOLTAGE_OUT] = -1, | |
164 | .m[PSC_CURRENT_OUT] = 23109, | |
165 | .b[PSC_CURRENT_OUT] = 0, | |
166 | .R[PSC_CURRENT_OUT] = -2, | |
167 | .m[PSC_TEMPERATURE] = -7612, | |
168 | .b[PSC_TEMPERATURE] = 335, | |
169 | .R[PSC_TEMPERATURE] = -3, | |
170 | .func[0] = PMBUS_HAVE_VOUT | PMBUS_HAVE_IOUT | PMBUS_HAVE_TEMP | |
171 | | PMBUS_HAVE_STATUS_VOUT | PMBUS_HAVE_STATUS_IOUT | |
172 | | PMBUS_HAVE_STATUS_TEMP, | |
2cfa6aed | 173 | .read_byte_data = max8688_read_byte_data, |
70e94b27 GR |
174 | .read_word_data = max8688_read_word_data, |
175 | .write_word_data = max8688_write_word_data, | |
8ea3238b GR |
176 | }; |
177 | ||
178 | static int max8688_probe(struct i2c_client *client, | |
179 | const struct i2c_device_id *id) | |
180 | { | |
181 | return pmbus_do_probe(client, id, &max8688_info); | |
182 | } | |
183 | ||
8ea3238b GR |
184 | static const struct i2c_device_id max8688_id[] = { |
185 | {"max8688", 0}, | |
186 | { } | |
187 | }; | |
188 | ||
189 | MODULE_DEVICE_TABLE(i2c, max8688_id); | |
190 | ||
191 | /* This is the driver that will be inserted */ | |
192 | static struct i2c_driver max8688_driver = { | |
193 | .driver = { | |
194 | .name = "max8688", | |
195 | }, | |
196 | .probe = max8688_probe, | |
dd285ad7 | 197 | .remove = pmbus_do_remove, |
8ea3238b GR |
198 | .id_table = max8688_id, |
199 | }; | |
200 | ||
f0967eea | 201 | module_i2c_driver(max8688_driver); |
8ea3238b GR |
202 | |
203 | MODULE_AUTHOR("Guenter Roeck"); | |
204 | MODULE_DESCRIPTION("PMBus driver for Maxim MAX8688"); | |
205 | MODULE_LICENSE("GPL"); |