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
|
/*
* I2C driver for Marvell 88PM80x
*
* Copyright (C) 2012 Marvell International Ltd.
* Haojian Zhuang <haojian.zhuang@marvell.com>
* Joseph(Yossi) Hanin <yhanin@marvell.com>
* Qiao Zhou <zhouqiao@marvell.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.
*/
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/i2c.h>
#include <linux/mfd/88pm80x.h>
#include <linux/slab.h>
#include <linux/uaccess.h>
#include <linux/err.h>
/* 88pm80x chips have same definition for chip id register. */
#define PM80X_CHIP_ID (0x00)
#define PM80X_CHIP_ID_NUM(x) (((x) >> 5) & 0x7)
#define PM80X_CHIP_ID_REVISION(x) ((x) & 0x1F)
struct pm80x_chip_mapping {
unsigned int id;
int type;
};
static struct pm80x_chip_mapping chip_mapping[] = {
/* 88PM800 chip id number */
{0x3, CHIP_PM800},
/* 88PM805 chip id number */
{0x0, CHIP_PM805},
};
/*
* workaround: some registers needed by pm805 are defined in pm800, so
* need to use this global variable to maintain the relation between
* pm800 and pm805. would remove it after HW chip fixes the issue.
*/
static struct pm80x_chip *g_pm80x_chip;
const struct regmap_config pm80x_regmap_config = {
.reg_bits = 8,
.val_bits = 8,
};
EXPORT_SYMBOL_GPL(pm80x_regmap_config);
int pm80x_init(struct i2c_client *client)
{
struct pm80x_chip *chip;
struct regmap *map;
unsigned int val;
int i, ret = 0;
chip =
devm_kzalloc(&client->dev, sizeof(struct pm80x_chip), GFP_KERNEL);
if (!chip)
return -ENOMEM;
map = devm_regmap_init_i2c(client, &pm80x_regmap_config);
if (IS_ERR(map)) {
ret = PTR_ERR(map);
dev_err(&client->dev, "Failed to allocate register map: %d\n",
ret);
return ret;
}
chip->client = client;
chip->regmap = map;
chip->irq = client->irq;
chip->dev = &client->dev;
dev_set_drvdata(chip->dev, chip);
i2c_set_clientdata(chip->client, chip);
ret = regmap_read(chip->regmap, PM80X_CHIP_ID, &val);
if (ret < 0) {
dev_err(chip->dev, "Failed to read CHIP ID: %d\n", ret);
return ret;
}
for (i = 0; i < ARRAY_SIZE(chip_mapping); i++) {
if (chip_mapping[i].id == PM80X_CHIP_ID_NUM(val)) {
chip->type = chip_mapping[i].type;
break;
}
}
if (i == ARRAY_SIZE(chip_mapping)) {
dev_err(chip->dev,
"Failed to detect Marvell 88PM800:ChipID[0x%x]\n", val);
return -EINVAL;
}
device_init_wakeup(&client->dev, 1);
/*
* workaround: set g_pm80x_chip to the first probed chip. if the
* second chip is probed, just point to the companion to each
* other so that pm805 can access those specific register. would
* remove it after HW chip fixes the issue.
*/
if (!g_pm80x_chip)
g_pm80x_chip = chip;
else {
chip->companion = g_pm80x_chip->client;
g_pm80x_chip->companion = chip->client;
}
return 0;
}
EXPORT_SYMBOL_GPL(pm80x_init);
int pm80x_deinit(void)
{
/*
* workaround: clear the dependency between pm800 and pm805.
* would remove it after HW chip fixes the issue.
*/
if (g_pm80x_chip->companion)
g_pm80x_chip->companion = NULL;
else
g_pm80x_chip = NULL;
return 0;
}
EXPORT_SYMBOL_GPL(pm80x_deinit);
#ifdef CONFIG_PM_SLEEP
static int pm80x_suspend(struct device *dev)
{
struct i2c_client *client = container_of(dev, struct i2c_client, dev);
struct pm80x_chip *chip = i2c_get_clientdata(client);
if (chip && chip->wu_flag)
if (device_may_wakeup(chip->dev))
enable_irq_wake(chip->irq);
return 0;
}
static int pm80x_resume(struct device *dev)
{
struct i2c_client *client = container_of(dev, struct i2c_client, dev);
struct pm80x_chip *chip = i2c_get_clientdata(client);
if (chip && chip->wu_flag)
if (device_may_wakeup(chip->dev))
disable_irq_wake(chip->irq);
return 0;
}
#endif
SIMPLE_DEV_PM_OPS(pm80x_pm_ops, pm80x_suspend, pm80x_resume);
EXPORT_SYMBOL_GPL(pm80x_pm_ops);
MODULE_DESCRIPTION("I2C Driver for Marvell 88PM80x");
MODULE_AUTHOR("Qiao Zhou <zhouqiao@marvell.com>");
MODULE_LICENSE("GPL");
|
