hwmon: (pmbus) Add support for VID output voltage mode
[linux-2.6.git] / drivers / hwmon / pmbus / adm1275.c
1 /*
2  * Hardware monitoring driver for Analog Devices ADM1275 Hot-Swap Controller
3  * and Digital Power Monitor
4  *
5  * Copyright (c) 2011 Ericsson AB.
6  *
7  * This program is free software; you can redistribute it and/or modify
8  * it under the terms of the GNU General Public License as published by
9  * the Free Software Foundation; either version 2 of the License, or
10  * (at your option) any later version.
11  *
12  * This program is distributed in the hope that it will be useful,
13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15  * GNU General Public License for more details.
16  */
17
18 #include <linux/kernel.h>
19 #include <linux/module.h>
20 #include <linux/init.h>
21 #include <linux/err.h>
22 #include <linux/slab.h>
23 #include <linux/i2c.h>
24 #include "pmbus.h"
25
26 #define ADM1275_PMON_CONFIG             0xd4
27
28 #define ADM1275_VIN_VOUT_SELECT         (1 << 6)
29 #define ADM1275_VRANGE                  (1 << 5)
30
31 static int adm1275_probe(struct i2c_client *client,
32                          const struct i2c_device_id *id)
33 {
34         int config;
35         int ret;
36         struct pmbus_driver_info *info;
37
38         if (!i2c_check_functionality(client->adapter,
39                                      I2C_FUNC_SMBUS_READ_BYTE_DATA))
40                 return -ENODEV;
41
42         info = kzalloc(sizeof(struct pmbus_driver_info), GFP_KERNEL);
43         if (!info)
44                 return -ENOMEM;
45
46         config = i2c_smbus_read_byte_data(client, ADM1275_PMON_CONFIG);
47         if (config < 0) {
48                 ret = config;
49                 goto err_mem;
50         }
51
52         info->pages = 1;
53         info->format[PSC_VOLTAGE_IN] = direct;
54         info->format[PSC_VOLTAGE_OUT] = direct;
55         info->format[PSC_CURRENT_OUT] = direct;
56         info->m[PSC_CURRENT_OUT] = 807;
57         info->b[PSC_CURRENT_OUT] = 20475;
58         info->R[PSC_CURRENT_OUT] = -1;
59         info->func[0] = PMBUS_HAVE_IOUT | PMBUS_HAVE_STATUS_IOUT;
60
61         if (config & ADM1275_VRANGE) {
62                 info->m[PSC_VOLTAGE_IN] = 19199;
63                 info->b[PSC_VOLTAGE_IN] = 0;
64                 info->R[PSC_VOLTAGE_IN] = -2;
65                 info->m[PSC_VOLTAGE_OUT] = 19199;
66                 info->b[PSC_VOLTAGE_OUT] = 0;
67                 info->R[PSC_VOLTAGE_OUT] = -2;
68         } else {
69                 info->m[PSC_VOLTAGE_IN] = 6720;
70                 info->b[PSC_VOLTAGE_IN] = 0;
71                 info->R[PSC_VOLTAGE_IN] = -1;
72                 info->m[PSC_VOLTAGE_OUT] = 6720;
73                 info->b[PSC_VOLTAGE_OUT] = 0;
74                 info->R[PSC_VOLTAGE_OUT] = -1;
75         }
76
77         if (config & ADM1275_VIN_VOUT_SELECT)
78                 info->func[0] |= PMBUS_HAVE_VOUT | PMBUS_HAVE_STATUS_VOUT;
79         else
80                 info->func[0] |= PMBUS_HAVE_VIN | PMBUS_HAVE_STATUS_INPUT;
81
82         ret = pmbus_do_probe(client, id, info);
83         if (ret)
84                 goto err_mem;
85         return 0;
86
87 err_mem:
88         kfree(info);
89         return ret;
90 }
91
92 static int adm1275_remove(struct i2c_client *client)
93 {
94         const struct pmbus_driver_info *info = pmbus_get_driver_info(client);
95         int ret;
96
97         ret = pmbus_do_remove(client);
98         kfree(info);
99         return ret;
100 }
101
102 static const struct i2c_device_id adm1275_id[] = {
103         {"adm1275", 0},
104         { }
105 };
106 MODULE_DEVICE_TABLE(i2c, adm1275_id);
107
108 static struct i2c_driver adm1275_driver = {
109         .driver = {
110                    .name = "adm1275",
111                    },
112         .probe = adm1275_probe,
113         .remove = adm1275_remove,
114         .id_table = adm1275_id,
115 };
116
117 static int __init adm1275_init(void)
118 {
119         return i2c_add_driver(&adm1275_driver);
120 }
121
122 static void __exit adm1275_exit(void)
123 {
124         i2c_del_driver(&adm1275_driver);
125 }
126
127 MODULE_AUTHOR("Guenter Roeck");
128 MODULE_DESCRIPTION("PMBus driver for Analog Devices ADM1275");
129 MODULE_LICENSE("GPL");
130 module_init(adm1275_init);
131 module_exit(adm1275_exit);