tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
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 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->direct[PSC_VOLTAGE_IN] = true;
54 info->direct[PSC_VOLTAGE_OUT] = true;
55 info->direct[PSC_CURRENT_OUT] = true;
56 info->m[PSC_CURRENT_OUT] = 800;
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] = 19045;
63 info->b[PSC_VOLTAGE_IN] = 0;
64 info->R[PSC_VOLTAGE_IN] = -2;
65 info->m[PSC_VOLTAGE_OUT] = 19045;
66 info->b[PSC_VOLTAGE_OUT] = 0;
67 info->R[PSC_VOLTAGE_OUT] = -2;
68 } else {
69 info->m[PSC_VOLTAGE_IN] = 6666;
70 info->b[PSC_VOLTAGE_IN] = 0;
71 info->R[PSC_VOLTAGE_IN] = -1;
72 info->m[PSC_VOLTAGE_OUT] = 6666;
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
87err_mem:
88 kfree(info);
89 return ret;
90}
91
92static 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
102static const struct i2c_device_id adm1275_id[] = {
103 {"adm1275", 0},
104 { }
105};
106MODULE_DEVICE_TABLE(i2c, adm1275_id);
107
108static 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
117static int __init adm1275_init(void)
118{
119 return i2c_add_driver(&adm1275_driver);
120}
121
122static void __exit adm1275_exit(void)
123{
124 i2c_del_driver(&adm1275_driver);
125}
126
127MODULE_AUTHOR("Guenter Roeck");
128MODULE_DESCRIPTION("PMBus driver for Analog Devices ADM1275");
129MODULE_LICENSE("GPL");
130module_init(adm1275_init);
131module_exit(adm1275_exit);