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a3eeb453 GR |
1 | /* |
2 | * Hardware monitoring driver for Maxim MAX34440/MAX34441 | |
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 | enum chips { max34440, max34441 }; | |
29 | ||
98591dbe GR |
30 | #define MAX34440_MFR_VOUT_PEAK 0xd4 |
31 | #define MAX34440_MFR_IOUT_PEAK 0xd5 | |
32 | #define MAX34440_MFR_TEMPERATURE_PEAK 0xd6 | |
33 | ||
a3eeb453 GR |
34 | #define MAX34440_STATUS_OC_WARN (1 << 0) |
35 | #define MAX34440_STATUS_OC_FAULT (1 << 1) | |
36 | #define MAX34440_STATUS_OT_FAULT (1 << 5) | |
37 | #define MAX34440_STATUS_OT_WARN (1 << 6) | |
38 | ||
98591dbe GR |
39 | static int max34440_read_word_data(struct i2c_client *client, int page, int reg) |
40 | { | |
41 | int ret; | |
42 | ||
43 | switch (reg) { | |
44 | case PMBUS_VIRT_READ_VOUT_MAX: | |
45 | ret = pmbus_read_word_data(client, page, | |
46 | MAX34440_MFR_VOUT_PEAK); | |
47 | break; | |
48 | case PMBUS_VIRT_READ_IOUT_MAX: | |
49 | ret = pmbus_read_word_data(client, page, | |
50 | MAX34440_MFR_IOUT_PEAK); | |
51 | break; | |
52 | case PMBUS_VIRT_READ_TEMP_MAX: | |
53 | ret = pmbus_read_word_data(client, page, | |
54 | MAX34440_MFR_TEMPERATURE_PEAK); | |
55 | break; | |
56 | case PMBUS_VIRT_RESET_VOUT_HISTORY: | |
57 | case PMBUS_VIRT_RESET_IOUT_HISTORY: | |
58 | case PMBUS_VIRT_RESET_TEMP_HISTORY: | |
59 | ret = 0; | |
60 | break; | |
61 | default: | |
62 | ret = -ENODATA; | |
63 | break; | |
64 | } | |
65 | return ret; | |
66 | } | |
67 | ||
68 | static int max34440_write_word_data(struct i2c_client *client, int page, | |
69 | int reg, u16 word) | |
70 | { | |
71 | int ret; | |
72 | ||
73 | switch (reg) { | |
74 | case PMBUS_VIRT_RESET_VOUT_HISTORY: | |
75 | ret = pmbus_write_word_data(client, page, | |
76 | MAX34440_MFR_VOUT_PEAK, 0); | |
77 | break; | |
78 | case PMBUS_VIRT_RESET_IOUT_HISTORY: | |
79 | ret = pmbus_write_word_data(client, page, | |
80 | MAX34440_MFR_IOUT_PEAK, 0); | |
81 | break; | |
82 | case PMBUS_VIRT_RESET_TEMP_HISTORY: | |
83 | ret = pmbus_write_word_data(client, page, | |
84 | MAX34440_MFR_TEMPERATURE_PEAK, | |
dc91ad8e | 85 | 0x8000); |
98591dbe GR |
86 | break; |
87 | default: | |
88 | ret = -ENODATA; | |
89 | break; | |
90 | } | |
91 | return ret; | |
92 | } | |
93 | ||
2cfa6aed | 94 | static int max34440_read_byte_data(struct i2c_client *client, int page, int reg) |
a3eeb453 | 95 | { |
da8e48ab | 96 | int ret = 0; |
a3eeb453 GR |
97 | int mfg_status; |
98 | ||
da8e48ab GR |
99 | if (page >= 0) { |
100 | ret = pmbus_set_page(client, page); | |
101 | if (ret < 0) | |
102 | return ret; | |
103 | } | |
a3eeb453 GR |
104 | |
105 | switch (reg) { | |
106 | case PMBUS_STATUS_IOUT: | |
107 | mfg_status = pmbus_read_word_data(client, 0, | |
108 | PMBUS_STATUS_MFR_SPECIFIC); | |
109 | if (mfg_status < 0) | |
110 | return mfg_status; | |
111 | if (mfg_status & MAX34440_STATUS_OC_WARN) | |
112 | ret |= PB_IOUT_OC_WARNING; | |
113 | if (mfg_status & MAX34440_STATUS_OC_FAULT) | |
114 | ret |= PB_IOUT_OC_FAULT; | |
115 | break; | |
116 | case PMBUS_STATUS_TEMPERATURE: | |
117 | mfg_status = pmbus_read_word_data(client, 0, | |
118 | PMBUS_STATUS_MFR_SPECIFIC); | |
119 | if (mfg_status < 0) | |
120 | return mfg_status; | |
121 | if (mfg_status & MAX34440_STATUS_OT_WARN) | |
122 | ret |= PB_TEMP_OT_WARNING; | |
123 | if (mfg_status & MAX34440_STATUS_OT_FAULT) | |
124 | ret |= PB_TEMP_OT_FAULT; | |
125 | break; | |
126 | default: | |
127 | ret = -ENODATA; | |
128 | break; | |
129 | } | |
130 | return ret; | |
131 | } | |
132 | ||
133 | static struct pmbus_driver_info max34440_info[] = { | |
134 | [max34440] = { | |
135 | .pages = 14, | |
1061d851 GR |
136 | .format[PSC_VOLTAGE_IN] = direct, |
137 | .format[PSC_VOLTAGE_OUT] = direct, | |
138 | .format[PSC_TEMPERATURE] = direct, | |
139 | .format[PSC_CURRENT_OUT] = direct, | |
a3eeb453 GR |
140 | .m[PSC_VOLTAGE_IN] = 1, |
141 | .b[PSC_VOLTAGE_IN] = 0, | |
142 | .R[PSC_VOLTAGE_IN] = 3, /* R = 0 in datasheet reflects mV */ | |
143 | .m[PSC_VOLTAGE_OUT] = 1, | |
144 | .b[PSC_VOLTAGE_OUT] = 0, | |
145 | .R[PSC_VOLTAGE_OUT] = 3, /* R = 0 in datasheet reflects mV */ | |
146 | .m[PSC_CURRENT_OUT] = 1, | |
147 | .b[PSC_CURRENT_OUT] = 0, | |
148 | .R[PSC_CURRENT_OUT] = 3, /* R = 0 in datasheet reflects mA */ | |
149 | .m[PSC_TEMPERATURE] = 1, | |
150 | .b[PSC_TEMPERATURE] = 0, | |
151 | .R[PSC_TEMPERATURE] = 2, | |
152 | .func[0] = PMBUS_HAVE_VOUT | PMBUS_HAVE_STATUS_VOUT | |
153 | | PMBUS_HAVE_IOUT | PMBUS_HAVE_STATUS_IOUT, | |
154 | .func[1] = PMBUS_HAVE_VOUT | PMBUS_HAVE_STATUS_VOUT | |
155 | | PMBUS_HAVE_IOUT | PMBUS_HAVE_STATUS_IOUT, | |
156 | .func[2] = PMBUS_HAVE_VOUT | PMBUS_HAVE_STATUS_VOUT | |
157 | | PMBUS_HAVE_IOUT | PMBUS_HAVE_STATUS_IOUT, | |
158 | .func[3] = PMBUS_HAVE_VOUT | PMBUS_HAVE_STATUS_VOUT | |
159 | | PMBUS_HAVE_IOUT | PMBUS_HAVE_STATUS_IOUT, | |
160 | .func[4] = PMBUS_HAVE_VOUT | PMBUS_HAVE_STATUS_VOUT | |
161 | | PMBUS_HAVE_IOUT | PMBUS_HAVE_STATUS_IOUT, | |
162 | .func[5] = PMBUS_HAVE_VOUT | PMBUS_HAVE_STATUS_VOUT | |
163 | | PMBUS_HAVE_IOUT | PMBUS_HAVE_STATUS_IOUT, | |
164 | .func[6] = PMBUS_HAVE_TEMP | PMBUS_HAVE_STATUS_TEMP, | |
165 | .func[7] = PMBUS_HAVE_TEMP | PMBUS_HAVE_STATUS_TEMP, | |
166 | .func[8] = PMBUS_HAVE_TEMP | PMBUS_HAVE_STATUS_TEMP, | |
167 | .func[9] = PMBUS_HAVE_TEMP | PMBUS_HAVE_STATUS_TEMP, | |
168 | .func[10] = PMBUS_HAVE_TEMP | PMBUS_HAVE_STATUS_TEMP, | |
169 | .func[11] = PMBUS_HAVE_TEMP | PMBUS_HAVE_STATUS_TEMP, | |
170 | .func[12] = PMBUS_HAVE_TEMP | PMBUS_HAVE_STATUS_TEMP, | |
171 | .func[13] = PMBUS_HAVE_TEMP | PMBUS_HAVE_STATUS_TEMP, | |
2cfa6aed | 172 | .read_byte_data = max34440_read_byte_data, |
98591dbe GR |
173 | .read_word_data = max34440_read_word_data, |
174 | .write_word_data = max34440_write_word_data, | |
a3eeb453 GR |
175 | }, |
176 | [max34441] = { | |
177 | .pages = 12, | |
1061d851 GR |
178 | .format[PSC_VOLTAGE_IN] = direct, |
179 | .format[PSC_VOLTAGE_OUT] = direct, | |
180 | .format[PSC_TEMPERATURE] = direct, | |
181 | .format[PSC_CURRENT_OUT] = direct, | |
182 | .format[PSC_FAN] = direct, | |
a3eeb453 GR |
183 | .m[PSC_VOLTAGE_IN] = 1, |
184 | .b[PSC_VOLTAGE_IN] = 0, | |
185 | .R[PSC_VOLTAGE_IN] = 3, | |
186 | .m[PSC_VOLTAGE_OUT] = 1, | |
187 | .b[PSC_VOLTAGE_OUT] = 0, | |
188 | .R[PSC_VOLTAGE_OUT] = 3, | |
189 | .m[PSC_CURRENT_OUT] = 1, | |
190 | .b[PSC_CURRENT_OUT] = 0, | |
191 | .R[PSC_CURRENT_OUT] = 3, | |
192 | .m[PSC_TEMPERATURE] = 1, | |
193 | .b[PSC_TEMPERATURE] = 0, | |
194 | .R[PSC_TEMPERATURE] = 2, | |
195 | .m[PSC_FAN] = 1, | |
196 | .b[PSC_FAN] = 0, | |
197 | .R[PSC_FAN] = 0, | |
198 | .func[0] = PMBUS_HAVE_VOUT | PMBUS_HAVE_STATUS_VOUT | |
199 | | PMBUS_HAVE_IOUT | PMBUS_HAVE_STATUS_IOUT, | |
200 | .func[1] = PMBUS_HAVE_VOUT | PMBUS_HAVE_STATUS_VOUT | |
201 | | PMBUS_HAVE_IOUT | PMBUS_HAVE_STATUS_IOUT, | |
202 | .func[2] = PMBUS_HAVE_VOUT | PMBUS_HAVE_STATUS_VOUT | |
203 | | PMBUS_HAVE_IOUT | PMBUS_HAVE_STATUS_IOUT, | |
204 | .func[3] = PMBUS_HAVE_VOUT | PMBUS_HAVE_STATUS_VOUT | |
205 | | PMBUS_HAVE_IOUT | PMBUS_HAVE_STATUS_IOUT, | |
206 | .func[4] = PMBUS_HAVE_VOUT | PMBUS_HAVE_STATUS_VOUT | |
207 | | PMBUS_HAVE_IOUT | PMBUS_HAVE_STATUS_IOUT, | |
208 | .func[5] = PMBUS_HAVE_FAN12 | PMBUS_HAVE_STATUS_FAN12, | |
209 | .func[6] = PMBUS_HAVE_TEMP | PMBUS_HAVE_STATUS_TEMP, | |
210 | .func[7] = PMBUS_HAVE_TEMP | PMBUS_HAVE_STATUS_TEMP, | |
211 | .func[8] = PMBUS_HAVE_TEMP | PMBUS_HAVE_STATUS_TEMP, | |
212 | .func[9] = PMBUS_HAVE_TEMP | PMBUS_HAVE_STATUS_TEMP, | |
213 | .func[10] = PMBUS_HAVE_TEMP | PMBUS_HAVE_STATUS_TEMP, | |
214 | .func[11] = PMBUS_HAVE_TEMP | PMBUS_HAVE_STATUS_TEMP, | |
2cfa6aed | 215 | .read_byte_data = max34440_read_byte_data, |
98591dbe GR |
216 | .read_word_data = max34440_read_word_data, |
217 | .write_word_data = max34440_write_word_data, | |
a3eeb453 GR |
218 | }, |
219 | }; | |
220 | ||
221 | static int max34440_probe(struct i2c_client *client, | |
222 | const struct i2c_device_id *id) | |
223 | { | |
224 | return pmbus_do_probe(client, id, &max34440_info[id->driver_data]); | |
225 | } | |
226 | ||
227 | static int max34440_remove(struct i2c_client *client) | |
228 | { | |
866cf12a GR |
229 | pmbus_do_remove(client); |
230 | return 0; | |
a3eeb453 GR |
231 | } |
232 | ||
233 | static const struct i2c_device_id max34440_id[] = { | |
234 | {"max34440", max34440}, | |
235 | {"max34441", max34441}, | |
236 | {} | |
237 | }; | |
238 | ||
239 | MODULE_DEVICE_TABLE(i2c, max34440_id); | |
240 | ||
241 | /* This is the driver that will be inserted */ | |
242 | static struct i2c_driver max34440_driver = { | |
243 | .driver = { | |
244 | .name = "max34440", | |
245 | }, | |
246 | .probe = max34440_probe, | |
247 | .remove = max34440_remove, | |
248 | .id_table = max34440_id, | |
249 | }; | |
250 | ||
f0967eea | 251 | module_i2c_driver(max34440_driver); |
a3eeb453 GR |
252 | |
253 | MODULE_AUTHOR("Guenter Roeck"); | |
254 | MODULE_DESCRIPTION("PMBus driver for Maxim MAX34440/MAX34441"); | |
255 | MODULE_LICENSE("GPL"); |