summaryrefslogtreecommitdiff
path: root/drivers/hwmon/twl4030-madc-hwmon.c
blob: 149d44a7c5842534988d122595b0a841f6f92f42 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
/*
 *
 * TWL4030 MADC Hwmon driver-This driver monitors the real time
 * conversion of analog signals like battery temperature,
 * battery type, battery level etc. User can ask for the conversion on a
 * particular channel using the sysfs nodes.
 *
 * Copyright (C) 2011 Texas Instruments Incorporated - http://www.ti.com/
 * J Keerthy <j-keerthy@ti.com>
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * version 2 as published by the Free Software Foundation.
 *
 * This program is distributed in the hope that it will be useful, but
 * WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
 * 02110-1301 USA
 *
 */
#include <linux/init.h>
#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/i2c/twl.h>
#include <linux/device.h>
#include <linux/platform_device.h>
#include <linux/i2c/twl4030-madc.h>
#include <linux/hwmon.h>
#include <linux/hwmon-sysfs.h>
#include <linux/stddef.h>
#include <linux/sysfs.h>
#include <linux/err.h>
#include <linux/types.h>

/*
 * sysfs hook function
 */
static ssize_t madc_read(struct device *dev,
			 struct device_attribute *devattr, char *buf)
{
	struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
	struct twl4030_madc_request req = {
		.channels = 1 << attr->index,
		.method = TWL4030_MADC_SW2,
		.type = TWL4030_MADC_WAIT,
	};
	long val;

	val = twl4030_madc_conversion(&req);
	if (val < 0)
		return val;

	return sprintf(buf, "%d\n", req.rbuf[attr->index]);
}

/* sysfs nodes to read individual channels from user side */
static SENSOR_DEVICE_ATTR(in0_input, S_IRUGO, madc_read, NULL, 0);
static SENSOR_DEVICE_ATTR(temp1_input, S_IRUGO, madc_read, NULL, 1);
static SENSOR_DEVICE_ATTR(in2_input, S_IRUGO, madc_read, NULL, 2);
static SENSOR_DEVICE_ATTR(in3_input, S_IRUGO, madc_read, NULL, 3);
static SENSOR_DEVICE_ATTR(in4_input, S_IRUGO, madc_read, NULL, 4);
static SENSOR_DEVICE_ATTR(in5_input, S_IRUGO, madc_read, NULL, 5);
static SENSOR_DEVICE_ATTR(in6_input, S_IRUGO, madc_read, NULL, 6);
static SENSOR_DEVICE_ATTR(in7_input, S_IRUGO, madc_read, NULL, 7);
static SENSOR_DEVICE_ATTR(in8_input, S_IRUGO, madc_read, NULL, 8);
static SENSOR_DEVICE_ATTR(in9_input, S_IRUGO, madc_read, NULL, 9);
static SENSOR_DEVICE_ATTR(curr10_input, S_IRUGO, madc_read, NULL, 10);
static SENSOR_DEVICE_ATTR(in11_input, S_IRUGO, madc_read, NULL, 11);
static SENSOR_DEVICE_ATTR(in12_input, S_IRUGO, madc_read, NULL, 12);
static SENSOR_DEVICE_ATTR(in15_input, S_IRUGO, madc_read, NULL, 15);

static struct attribute *twl4030_madc_attributes[] = {
	&sensor_dev_attr_in0_input.dev_attr.attr,
	&sensor_dev_attr_temp1_input.dev_attr.attr,
	&sensor_dev_attr_in2_input.dev_attr.attr,
	&sensor_dev_attr_in3_input.dev_attr.attr,
	&sensor_dev_attr_in4_input.dev_attr.attr,
	&sensor_dev_attr_in5_input.dev_attr.attr,
	&sensor_dev_attr_in6_input.dev_attr.attr,
	&sensor_dev_attr_in7_input.dev_attr.attr,
	&sensor_dev_attr_in8_input.dev_attr.attr,
	&sensor_dev_attr_in9_input.dev_attr.attr,
	&sensor_dev_attr_curr10_input.dev_attr.attr,
	&sensor_dev_attr_in11_input.dev_attr.attr,
	&sensor_dev_attr_in12_input.dev_attr.attr,
	&sensor_dev_attr_in15_input.dev_attr.attr,
	NULL
};

static const struct attribute_group twl4030_madc_group = {
	.attrs = twl4030_madc_attributes,
};

static int twl4030_madc_hwmon_probe(struct platform_device *pdev)
{
	int ret;
	struct device *hwmon;

	ret = sysfs_create_group(&pdev->dev.kobj, &twl4030_madc_group);
	if (ret)
		goto err_sysfs;
	hwmon = hwmon_device_register(&pdev->dev);
	if (IS_ERR(hwmon)) {
		dev_err(&pdev->dev, "hwmon_device_register failed.\n");
		ret = PTR_ERR(hwmon);
		goto err_reg;
	}

	return 0;

err_reg:
	sysfs_remove_group(&pdev->dev.kobj, &twl4030_madc_group);
err_sysfs:

	return ret;
}

static int twl4030_madc_hwmon_remove(struct platform_device *pdev)
{
	hwmon_device_unregister(&pdev->dev);
	sysfs_remove_group(&pdev->dev.kobj, &twl4030_madc_group);

	return 0;
}

static struct platform_driver twl4030_madc_hwmon_driver = {
	.probe = twl4030_madc_hwmon_probe,
	.remove = __exit_p(twl4030_madc_hwmon_remove),
	.driver = {
		   .name = "twl4030_madc_hwmon",
		   .owner = THIS_MODULE,
		   },
};

module_platform_driver(twl4030_madc_hwmon_driver);

MODULE_DESCRIPTION("TWL4030 ADC Hwmon driver");
MODULE_LICENSE("GPL");
MODULE_AUTHOR("J Keerthy");
MODULE_ALIAS("platform:twl4030_madc_hwmon");