7d830c1e70327f05c3ded0dd655ba88e53de9e72
[linux-3.10.git] / drivers / hwmon / pmbus / max34440.c
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
30 #define MAX34440_MFR_VOUT_PEAK          0xd4
31 #define MAX34440_MFR_IOUT_PEAK          0xd5
32 #define MAX34440_MFR_TEMPERATURE_PEAK   0xd6
33
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
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,
85                                             0x8000);
86                 break;
87         default:
88                 ret = -ENODATA;
89                 break;
90         }
91         return ret;
92 }
93
94 static int max34440_read_byte_data(struct i2c_client *client, int page, int reg)
95 {
96         int ret = 0;
97         int mfg_status;
98
99         if (page >= 0) {
100                 ret = pmbus_set_page(client, page);
101                 if (ret < 0)
102                         return ret;
103         }
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,
136                 .format[PSC_VOLTAGE_IN] = direct,
137                 .format[PSC_VOLTAGE_OUT] = direct,
138                 .format[PSC_TEMPERATURE] = direct,
139                 .format[PSC_CURRENT_OUT] = direct,
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,
172                 .read_byte_data = max34440_read_byte_data,
173                 .read_word_data = max34440_read_word_data,
174                 .write_word_data = max34440_write_word_data,
175         },
176         [max34441] = {
177                 .pages = 12,
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,
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,
215                 .read_byte_data = max34440_read_byte_data,
216                 .read_word_data = max34440_read_word_data,
217                 .write_word_data = max34440_write_word_data,
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 const struct i2c_device_id max34440_id[] = {
228         {"max34440", max34440},
229         {"max34441", max34441},
230         {}
231 };
232
233 MODULE_DEVICE_TABLE(i2c, max34440_id);
234
235 /* This is the driver that will be inserted */
236 static struct i2c_driver max34440_driver = {
237         .driver = {
238                    .name = "max34440",
239                    },
240         .probe = max34440_probe,
241         .remove = pmbus_do_remove,
242         .id_table = max34440_id,
243 };
244
245 module_i2c_driver(max34440_driver);
246
247 MODULE_AUTHOR("Guenter Roeck");
248 MODULE_DESCRIPTION("PMBus driver for Maxim MAX34440/MAX34441");
249 MODULE_LICENSE("GPL");