summaryrefslogtreecommitdiffstats
path: root/drivers/mfd/mc34704.c
blob: bfda169aaa271a6f504cc6f77c739759dc2933ec (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
/*
 * Copyright (C) 2007 Sascha Hauer, Pengutronix
 *               2009 Marc Kleine-Budde <mkl@pengutronix.de>
 * Copyright (C) 2010 Baruch Siach <baruch@tkos.co.il>
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License as
 * published by the Free Software Foundation; either version 2 of
 * the License, or (at your option) any later version.
 *
 * 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.
 *
 *
 */

#include <common.h>
#include <init.h>
#include <driver.h>
#include <xfuncs.h>
#include <errno.h>

#include <i2c/i2c.h>
#include <mfd/mc34704.h>

#define DRIVERNAME		"mc34704"

#define to_mc34704(a)		container_of(a, struct mc34704, cdev)

static struct mc34704 *mc34704_dev;

struct mc34704 *mc34704_get(void)
{
	if (!mc34704_dev)
		return NULL;

	return mc34704_dev;
}
EXPORT_SYMBOL(mc34704_get);

int mc34704_reg_read(struct mc34704 *mc34704, u8 reg, u8 *val)
{
	int ret;

	ret = i2c_read_reg(mc34704->client, reg, val, 1);

	return ret == 1 ? 0 : ret;
}
EXPORT_SYMBOL(mc34704_reg_read);

int mc34704_reg_write(struct mc34704 *mc34704, u8 reg, u8 val)
{
	int ret;

	ret = i2c_write_reg(mc34704->client, reg, &val, 1);

	return ret == 1 ? 0 : ret;
}
EXPORT_SYMBOL(mc34704_reg_write);

static ssize_t mc34704_read(struct cdev *cdev, void *_buf, size_t count,
		loff_t offset, ulong flags)
{
	struct mc34704 *priv = to_mc34704(cdev);
	u8 *buf = _buf;
	size_t i = count;
	int err;

	while (i) {
		err = mc34704_reg_read(priv, offset, buf);
		if (err)
			return (ssize_t)err;
		buf++;
		i--;
		offset++;
	}

	return count;
}

static ssize_t mc34704_write(struct cdev *cdev, const void *_buf, size_t count,
		loff_t offset, ulong flags)
{
	struct mc34704 *mc34704 = to_mc34704(cdev);
	const u8 *buf = _buf;
	size_t i = count;
	int err;

	while (i) {
		err = mc34704_reg_write(mc34704, offset, *buf);
		if (err)
			return (ssize_t)err;
		buf++;
		i--;
		offset++;
	}

	return count;
}

static struct cdev_operations mc34704_fops = {
	.lseek	= dev_lseek_default,
	.read	= mc34704_read,
	.write	= mc34704_write,
};

static int mc34704_probe(struct device_d *dev)
{
	if (mc34704_dev)
		return -EBUSY;

	mc34704_dev = xzalloc(sizeof(struct mc34704));
	mc34704_dev->cdev.name = DRIVERNAME;
	mc34704_dev->client = to_i2c_client(dev);
	mc34704_dev->cdev.size = 256;
	mc34704_dev->cdev.dev = dev;
	mc34704_dev->cdev.ops = &mc34704_fops;

	devfs_create(&mc34704_dev->cdev);

	return 0;
}

static __maybe_unused struct of_device_id mc34704_dt_ids[] = {
	{ .compatible = "fsl,mc34704", },
	{ }
};

static struct driver_d mc34704_driver = {
	.name  = DRIVERNAME,
	.probe = mc34704_probe,
	.of_compatible = DRV_OF_COMPAT(mc34704_dt_ids),
};

static int mc34704_init(void)
{
	i2c_driver_register(&mc34704_driver);
	return 0;
}
device_initcall(mc34704_init);