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
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
|
// SPDX-License-Identifier: GPL-2.0-or-later
/*
* Broadcom BCM590xx PMU
*
* Copyright 2014 Linaro Limited
* Author: Matt Porter <mporter@linaro.org>
*/
#include <linux/err.h>
#include <linux/i2c.h>
#include <linux/init.h>
#include <linux/mfd/bcm590xx.h>
#include <linux/mfd/core.h>
#include <linux/module.h>
#include <linux/moduleparam.h>
#include <linux/of.h>
#include <linux/regmap.h>
#include <linux/slab.h>
/* Under primary I2C address: */
#define BCM590XX_REG_PMUID 0x1e
#define BCM590XX_REG_PMUREV 0x1f
#define BCM590XX_PMUREV_DIG_MASK 0xF
#define BCM590XX_PMUREV_DIG_SHIFT 0
#define BCM590XX_PMUREV_ANA_MASK 0xF0
#define BCM590XX_PMUREV_ANA_SHIFT 4
static const struct mfd_cell bcm590xx_devs[] = {
{
.name = "bcm590xx-vregs",
},
};
static const struct regmap_config bcm590xx_regmap_config_pri = {
.reg_bits = 8,
.val_bits = 8,
.max_register = BCM590XX_MAX_REGISTER_PRI,
.cache_type = REGCACHE_MAPLE,
};
static const struct regmap_config bcm590xx_regmap_config_sec = {
.reg_bits = 8,
.val_bits = 8,
.max_register = BCM590XX_MAX_REGISTER_SEC,
.cache_type = REGCACHE_MAPLE,
};
/* Map PMU ID value to model name string */
static const char * const bcm590xx_names[] = {
[BCM590XX_PMUID_BCM59054] = "BCM59054",
[BCM590XX_PMUID_BCM59056] = "BCM59056",
};
static int bcm590xx_parse_version(struct bcm590xx *bcm590xx)
{
unsigned int id, rev;
int ret;
/* Get PMU ID and verify that it matches compatible */
ret = regmap_read(bcm590xx->regmap_pri, BCM590XX_REG_PMUID, &id);
if (ret) {
dev_err(bcm590xx->dev, "failed to read PMU ID: %d\n", ret);
return ret;
}
if (id != bcm590xx->pmu_id) {
dev_err(bcm590xx->dev, "Incorrect ID for %s: expected %x, got %x.\n",
bcm590xx_names[bcm590xx->pmu_id], bcm590xx->pmu_id, id);
return -ENODEV;
}
/* Get PMU revision and store it in the info struct */
ret = regmap_read(bcm590xx->regmap_pri, BCM590XX_REG_PMUREV, &rev);
if (ret) {
dev_err(bcm590xx->dev, "failed to read PMU revision: %d\n", ret);
return ret;
}
bcm590xx->rev_digital = (rev & BCM590XX_PMUREV_DIG_MASK) >> BCM590XX_PMUREV_DIG_SHIFT;
bcm590xx->rev_analog = (rev & BCM590XX_PMUREV_ANA_MASK) >> BCM590XX_PMUREV_ANA_SHIFT;
dev_dbg(bcm590xx->dev, "PMU ID 0x%x (%s), revision: digital %d, analog %d",
id, bcm590xx_names[id], bcm590xx->rev_digital, bcm590xx->rev_analog);
return 0;
}
static int bcm590xx_i2c_probe(struct i2c_client *i2c_pri)
{
struct bcm590xx *bcm590xx;
int ret;
bcm590xx = devm_kzalloc(&i2c_pri->dev, sizeof(*bcm590xx), GFP_KERNEL);
if (!bcm590xx)
return -ENOMEM;
i2c_set_clientdata(i2c_pri, bcm590xx);
bcm590xx->dev = &i2c_pri->dev;
bcm590xx->i2c_pri = i2c_pri;
bcm590xx->pmu_id = (uintptr_t) of_device_get_match_data(bcm590xx->dev);
bcm590xx->regmap_pri = devm_regmap_init_i2c(i2c_pri,
&bcm590xx_regmap_config_pri);
if (IS_ERR(bcm590xx->regmap_pri)) {
ret = PTR_ERR(bcm590xx->regmap_pri);
dev_err(&i2c_pri->dev, "primary regmap init failed: %d\n", ret);
return ret;
}
/* Secondary I2C slave address is the base address with A(2) asserted */
bcm590xx->i2c_sec = i2c_new_dummy_device(i2c_pri->adapter,
i2c_pri->addr | BIT(2));
if (IS_ERR(bcm590xx->i2c_sec)) {
dev_err(&i2c_pri->dev, "failed to add secondary I2C device\n");
return PTR_ERR(bcm590xx->i2c_sec);
}
i2c_set_clientdata(bcm590xx->i2c_sec, bcm590xx);
bcm590xx->regmap_sec = devm_regmap_init_i2c(bcm590xx->i2c_sec,
&bcm590xx_regmap_config_sec);
if (IS_ERR(bcm590xx->regmap_sec)) {
ret = PTR_ERR(bcm590xx->regmap_sec);
dev_err(&bcm590xx->i2c_sec->dev,
"secondary regmap init failed: %d\n", ret);
goto err;
}
ret = bcm590xx_parse_version(bcm590xx);
if (ret)
goto err;
ret = devm_mfd_add_devices(&i2c_pri->dev, -1, bcm590xx_devs,
ARRAY_SIZE(bcm590xx_devs), NULL, 0, NULL);
if (ret < 0) {
dev_err(&i2c_pri->dev, "failed to add sub-devices: %d\n", ret);
goto err;
}
return 0;
err:
i2c_unregister_device(bcm590xx->i2c_sec);
return ret;
}
static const struct of_device_id bcm590xx_of_match[] = {
{
.compatible = "brcm,bcm59054",
.data = (void *)BCM590XX_PMUID_BCM59054,
},
{
.compatible = "brcm,bcm59056",
.data = (void *)BCM590XX_PMUID_BCM59056,
},
{ }
};
MODULE_DEVICE_TABLE(of, bcm590xx_of_match);
static const struct i2c_device_id bcm590xx_i2c_id[] = {
{ "bcm59054" },
{ "bcm59056" },
{ }
};
MODULE_DEVICE_TABLE(i2c, bcm590xx_i2c_id);
static struct i2c_driver bcm590xx_i2c_driver = {
.driver = {
.name = "bcm590xx",
.of_match_table = bcm590xx_of_match,
},
.probe = bcm590xx_i2c_probe,
.id_table = bcm590xx_i2c_id,
};
module_i2c_driver(bcm590xx_i2c_driver);
MODULE_AUTHOR("Matt Porter <mporter@linaro.org>");
MODULE_DESCRIPTION("BCM590xx multi-function driver");
MODULE_LICENSE("GPL v2");
|
