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authorGuenter Roeck <guenter.roeck@ericsson.com>2011-03-17 16:16:01 -0400
committerGuenter Roeck <guenter.roeck@ericsson.com>2011-05-19 11:19:41 -0400
commit83f7649c52871d4b0799c209c364374b682fa4a8 (patch)
treee39a462b73225034026277767fa45de9832a7975 /drivers/hwmon/adm1275.c
parent0c0a0615163e025eb978547969467012529e01d5 (diff)
hwmon: (pmbus) Add support for Analog Devices ADM1275
Add support for Analog Devices ADM1275 Hot-Swap Controller and Digital Power Monitor Signed-off-by: Guenter Roeck <guenter.roeck@ericsson.com> Reviewed-by: Tom Grennan <tom.grennan@ericsson.com>
Diffstat (limited to 'drivers/hwmon/adm1275.c')
-rw-r--r--drivers/hwmon/adm1275.c121
1 files changed, 121 insertions, 0 deletions
diff --git a/drivers/hwmon/adm1275.c b/drivers/hwmon/adm1275.c
new file mode 100644
index 000000000000..c2ee2048ab91
--- /dev/null
+++ b/drivers/hwmon/adm1275.c
@@ -0,0 +1,121 @@
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
31static int adm1275_probe(struct i2c_client *client,
32 const struct i2c_device_id *id)
33{
34 int config;
35 struct pmbus_driver_info *info;
36
37 if (!i2c_check_functionality(client->adapter,
38 I2C_FUNC_SMBUS_READ_BYTE_DATA))
39 return -ENODEV;
40
41 info = kzalloc(sizeof(struct pmbus_driver_info), GFP_KERNEL);
42 if (!info)
43 return -ENOMEM;
44
45 config = i2c_smbus_read_byte_data(client, ADM1275_PMON_CONFIG);
46 if (config < 0)
47 return config;
48
49 info->pages = 1;
50 info->direct[PSC_VOLTAGE_IN] = true;
51 info->direct[PSC_VOLTAGE_OUT] = true;
52 info->direct[PSC_CURRENT_OUT] = true;
53 info->m[PSC_CURRENT_OUT] = 800;
54 info->b[PSC_CURRENT_OUT] = 20475;
55 info->R[PSC_CURRENT_OUT] = -1;
56 info->func[0] = PMBUS_HAVE_IOUT | PMBUS_HAVE_STATUS_IOUT;
57
58 if (config & ADM1275_VRANGE) {
59 info->m[PSC_VOLTAGE_IN] = 19045;
60 info->b[PSC_VOLTAGE_IN] = 0;
61 info->R[PSC_VOLTAGE_IN] = -2;
62 info->m[PSC_VOLTAGE_OUT] = 19045;
63 info->b[PSC_VOLTAGE_OUT] = 0;
64 info->R[PSC_VOLTAGE_OUT] = -2;
65 } else {
66 info->m[PSC_VOLTAGE_IN] = 6666;
67 info->b[PSC_VOLTAGE_IN] = 0;
68 info->R[PSC_VOLTAGE_IN] = -1;
69 info->m[PSC_VOLTAGE_OUT] = 6666;
70 info->b[PSC_VOLTAGE_OUT] = 0;
71 info->R[PSC_VOLTAGE_OUT] = -1;
72 }
73
74 if (config & ADM1275_VIN_VOUT_SELECT)
75 info->func[0] |= PMBUS_HAVE_VOUT | PMBUS_HAVE_STATUS_VOUT;
76 else
77 info->func[0] |= PMBUS_HAVE_VIN | PMBUS_HAVE_STATUS_INPUT;
78
79 return pmbus_do_probe(client, id, info);
80}
81
82static int adm1275_remove(struct i2c_client *client)
83{
84 const struct pmbus_driver_info *info = pmbus_get_driver_info(client);
85 int ret;
86
87 ret = pmbus_do_remove(client);
88 kfree(info);
89 return ret;
90}
91
92static const struct i2c_device_id adm1275_id[] = {
93 {"adm1275", 0},
94 { }
95};
96MODULE_DEVICE_TABLE(i2c, adm1275_id);
97
98static struct i2c_driver adm1275_driver = {
99 .driver = {
100 .name = "adm1275",
101 },
102 .probe = adm1275_probe,
103 .remove = adm1275_remove,
104 .id_table = adm1275_id,
105};
106
107static int __init adm1275_init(void)
108{
109 return i2c_add_driver(&adm1275_driver);
110}
111
112static void __exit adm1275_exit(void)
113{
114 i2c_del_driver(&adm1275_driver);
115}
116
117MODULE_AUTHOR("Guenter Roeck");
118MODULE_DESCRIPTION("PMBus driver for Analog Devices ADM1275");
119MODULE_LICENSE("GPL");
120module_init(adm1275_init);
121module_exit(adm1275_exit);