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
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
|
// SPDX-License-Identifier: GPL-2.0
/*
* Copyright (C) 2020 NovaTech LLC
* George McCollister <george.mccollister@gmail.com>
*/
#include <linux/bits.h>
#include <linux/i2c.h>
#include <linux/module.h>
#include "xrs700x.h"
#include "xrs700x_reg.h"
struct xrs700x_i2c_cmd {
__be32 reg;
__be16 val;
} __packed;
static int xrs700x_i2c_reg_read(void *context, unsigned int reg,
unsigned int *val)
{
struct device *dev = context;
struct i2c_client *i2c = to_i2c_client(dev);
struct xrs700x_i2c_cmd cmd;
int ret;
cmd.reg = cpu_to_be32(reg | 1);
ret = i2c_master_send(i2c, (char *)&cmd.reg, sizeof(cmd.reg));
if (ret < 0) {
dev_err(dev, "xrs i2c_master_send returned %d\n", ret);
return ret;
}
ret = i2c_master_recv(i2c, (char *)&cmd.val, sizeof(cmd.val));
if (ret < 0) {
dev_err(dev, "xrs i2c_master_recv returned %d\n", ret);
return ret;
}
*val = be16_to_cpu(cmd.val);
return 0;
}
static int xrs700x_i2c_reg_write(void *context, unsigned int reg,
unsigned int val)
{
struct device *dev = context;
struct i2c_client *i2c = to_i2c_client(dev);
struct xrs700x_i2c_cmd cmd;
int ret;
cmd.reg = cpu_to_be32(reg);
cmd.val = cpu_to_be16(val);
ret = i2c_master_send(i2c, (char *)&cmd, sizeof(cmd));
if (ret < 0) {
dev_err(dev, "xrs i2c_master_send returned %d\n", ret);
return ret;
}
return 0;
}
static const struct regmap_config xrs700x_i2c_regmap_config = {
.val_bits = 16,
.reg_stride = 2,
.reg_bits = 32,
.pad_bits = 0,
.write_flag_mask = 0,
.read_flag_mask = 0,
.reg_read = xrs700x_i2c_reg_read,
.reg_write = xrs700x_i2c_reg_write,
.max_register = 0,
.cache_type = REGCACHE_NONE,
.reg_format_endian = REGMAP_ENDIAN_BIG,
.val_format_endian = REGMAP_ENDIAN_BIG
};
static int xrs700x_i2c_probe(struct i2c_client *i2c,
const struct i2c_device_id *i2c_id)
{
struct xrs700x *priv;
int ret;
priv = xrs700x_switch_alloc(&i2c->dev, i2c);
if (!priv)
return -ENOMEM;
priv->regmap = devm_regmap_init(&i2c->dev, NULL, &i2c->dev,
&xrs700x_i2c_regmap_config);
if (IS_ERR(priv->regmap)) {
ret = PTR_ERR(priv->regmap);
dev_err(&i2c->dev, "Failed to initialize regmap: %d\n", ret);
return ret;
}
i2c_set_clientdata(i2c, priv);
ret = xrs700x_switch_register(priv);
/* Main DSA driver may not be started yet. */
if (ret)
return ret;
return 0;
}
static void xrs700x_i2c_remove(struct i2c_client *i2c)
{
struct xrs700x *priv = i2c_get_clientdata(i2c);
if (!priv)
return;
xrs700x_switch_remove(priv);
}
static void xrs700x_i2c_shutdown(struct i2c_client *i2c)
{
struct xrs700x *priv = i2c_get_clientdata(i2c);
if (!priv)
return;
xrs700x_switch_shutdown(priv);
i2c_set_clientdata(i2c, NULL);
}
static const struct i2c_device_id xrs700x_i2c_id[] = {
{ "xrs700x-switch", 0 },
{},
};
MODULE_DEVICE_TABLE(i2c, xrs700x_i2c_id);
static const struct of_device_id __maybe_unused xrs700x_i2c_dt_ids[] = {
{ .compatible = "arrow,xrs7003e", .data = &xrs7003e_info },
{ .compatible = "arrow,xrs7003f", .data = &xrs7003f_info },
{ .compatible = "arrow,xrs7004e", .data = &xrs7004e_info },
{ .compatible = "arrow,xrs7004f", .data = &xrs7004f_info },
{},
};
MODULE_DEVICE_TABLE(of, xrs700x_i2c_dt_ids);
static struct i2c_driver xrs700x_i2c_driver = {
.driver = {
.name = "xrs700x-i2c",
.of_match_table = of_match_ptr(xrs700x_i2c_dt_ids),
},
.probe = xrs700x_i2c_probe,
.remove = xrs700x_i2c_remove,
.shutdown = xrs700x_i2c_shutdown,
.id_table = xrs700x_i2c_id,
};
module_i2c_driver(xrs700x_i2c_driver);
MODULE_AUTHOR("George McCollister <george.mccollister@gmail.com>");
MODULE_DESCRIPTION("Arrow SpeedChips XRS700x DSA I2C driver");
MODULE_LICENSE("GPL v2");
|
