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
|
/*
* MFD core driver for Ricoh RN5T618 PMIC
*
* Copyright (C) 2014 Beniamino Galvani <b.galvani@gmail.com>
* Copyright (C) 2016 Toradex AG
*
* 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.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include <linux/delay.h>
#include <linux/i2c.h>
#include <linux/mfd/core.h>
#include <linux/mfd/rn5t618.h>
#include <linux/module.h>
#include <linux/of_device.h>
#include <linux/reboot.h>
#include <linux/regmap.h>
static const struct mfd_cell rn5t618_cells[] = {
{ .name = "rn5t618-regulator" },
{ .name = "rn5t618-wdt" },
};
static bool rn5t618_volatile_reg(struct device *dev, unsigned int reg)
{
switch (reg) {
case RN5T618_WATCHDOGCNT:
case RN5T618_DCIRQ:
case RN5T618_ILIMDATAH ... RN5T618_AIN0DATAL:
case RN5T618_IR_ADC1 ... RN5T618_IR_ADC3:
case RN5T618_IR_GPR:
case RN5T618_IR_GPF:
case RN5T618_MON_IOIN:
case RN5T618_INTMON:
return true;
default:
return false;
}
}
static const struct regmap_config rn5t618_regmap_config = {
.reg_bits = 8,
.val_bits = 8,
.volatile_reg = rn5t618_volatile_reg,
.max_register = RN5T618_MAX_REG,
.cache_type = REGCACHE_RBTREE,
};
static struct rn5t618 *rn5t618_pm_power_off;
static struct notifier_block rn5t618_restart_handler;
static void rn5t618_trigger_poweroff_sequence(bool repower)
{
/* disable automatic repower-on */
regmap_update_bits(rn5t618_pm_power_off->regmap, RN5T618_REPCNT,
RN5T618_REPCNT_REPWRON,
repower ? RN5T618_REPCNT_REPWRON : 0);
/* start power-off sequence */
regmap_update_bits(rn5t618_pm_power_off->regmap, RN5T618_SLPCNT,
RN5T618_SLPCNT_SWPWROFF, RN5T618_SLPCNT_SWPWROFF);
}
static void rn5t618_power_off(void)
{
rn5t618_trigger_poweroff_sequence(false);
}
static int rn5t618_restart(struct notifier_block *this,
unsigned long mode, void *cmd)
{
rn5t618_trigger_poweroff_sequence(true);
/*
* Re-power factor detection on PMIC side is not instant. 1ms
* proved to be enough time until reset takes effect.
*/
mdelay(1);
return NOTIFY_DONE;
}
static const struct of_device_id rn5t618_of_match[] = {
{ .compatible = "ricoh,rn5t567", .data = (void *)RN5T567 },
{ .compatible = "ricoh,rn5t618", .data = (void *)RN5T618 },
{ }
};
MODULE_DEVICE_TABLE(of, rn5t618_of_match);
static int rn5t618_i2c_probe(struct i2c_client *i2c,
const struct i2c_device_id *id)
{
const struct of_device_id *of_id;
struct rn5t618 *priv;
int ret;
of_id = of_match_device(rn5t618_of_match, &i2c->dev);
if (!of_id) {
dev_err(&i2c->dev, "Failed to find matching DT ID\n");
return -EINVAL;
}
priv = devm_kzalloc(&i2c->dev, sizeof(*priv), GFP_KERNEL);
if (!priv)
return -ENOMEM;
i2c_set_clientdata(i2c, priv);
priv->variant = (long)of_id->data;
priv->regmap = devm_regmap_init_i2c(i2c, &rn5t618_regmap_config);
if (IS_ERR(priv->regmap)) {
ret = PTR_ERR(priv->regmap);
dev_err(&i2c->dev, "regmap init failed: %d\n", ret);
return ret;
}
ret = devm_mfd_add_devices(&i2c->dev, -1, rn5t618_cells,
ARRAY_SIZE(rn5t618_cells), NULL, 0, NULL);
if (ret) {
dev_err(&i2c->dev, "failed to add sub-devices: %d\n", ret);
return ret;
}
rn5t618_pm_power_off = priv;
if (of_device_is_system_power_controller(i2c->dev.of_node)) {
if (!pm_power_off)
pm_power_off = rn5t618_power_off;
else
dev_warn(&i2c->dev, "Poweroff callback already assigned\n");
}
rn5t618_restart_handler.notifier_call = rn5t618_restart;
rn5t618_restart_handler.priority = 192;
ret = register_restart_handler(&rn5t618_restart_handler);
if (ret) {
dev_err(&i2c->dev, "cannot register restart handler, %d\n", ret);
return ret;
}
return 0;
}
static int rn5t618_i2c_remove(struct i2c_client *i2c)
{
struct rn5t618 *priv = i2c_get_clientdata(i2c);
if (priv == rn5t618_pm_power_off) {
rn5t618_pm_power_off = NULL;
pm_power_off = NULL;
}
return 0;
}
static const struct i2c_device_id rn5t618_i2c_id[] = {
{ }
};
MODULE_DEVICE_TABLE(i2c, rn5t618_i2c_id);
static struct i2c_driver rn5t618_i2c_driver = {
.driver = {
.name = "rn5t618",
.of_match_table = of_match_ptr(rn5t618_of_match),
},
.probe = rn5t618_i2c_probe,
.remove = rn5t618_i2c_remove,
.id_table = rn5t618_i2c_id,
};
module_i2c_driver(rn5t618_i2c_driver);
MODULE_AUTHOR("Beniamino Galvani <b.galvani@gmail.com>");
MODULE_DESCRIPTION("Ricoh RN5T567/618 MFD driver");
MODULE_LICENSE("GPL v2");
|
