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
|
/*
* 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 <malloc.h>
#include <poller.h>
#include <kfifo.h>
#include <mfd/twl6030.h>
#include <twl6030_pwrbtn.h>
struct twl6030_pwrbtn_internal_data {
int code;
u8 previous_state;
struct twl6030 *twl6030;
struct kfifo *recv_fifo;
struct console_device cdev;
struct poller_struct poller;
};
#define PWR_PWRON_IRQ (1 << 0)
static void ic2_key_poller(struct poller_struct *poller)
{
struct twl6030_pwrbtn_internal_data *idata = container_of(
poller, struct twl6030_pwrbtn_internal_data, poller);
u8 val;
if (twl6030_reg_read(idata->twl6030, TWL6030_PMCM_HW, &val)) {
dev_err(idata->cdev.dev, "reading i2c\n");
return;
}
val = !(val & PWR_PWRON_IRQ);
if (val != idata->previous_state && val) {
kfifo_put(idata->recv_fifo, (u_char *)&idata->code,
sizeof(int));
dev_dbg(idata->cdev.dev, "pressed power button as %d\n",
idata->code);
}
idata->previous_state = val;
}
static int twl6030_pwrbtn_tstc(struct console_device *cdev)
{
struct twl6030_pwrbtn_internal_data *idata = container_of(
cdev, struct twl6030_pwrbtn_internal_data, cdev);
return kfifo_len(idata->recv_fifo) ? 1 : 0;
}
static int twl6030_pwrbtn_getc(struct console_device *cdev)
{
int code = 0;
struct twl6030_pwrbtn_internal_data *idata = container_of(
cdev, struct twl6030_pwrbtn_internal_data, cdev);
kfifo_get(idata->recv_fifo, (u_char *)&code, sizeof(int));
return code;
}
static int __init twl6030_pwrbtn_probe(struct device_d *dev)
{
struct twl6030_pwrbtn_internal_data *idata;
struct twl6030_pwrbtn_platform_data *pdata;
pdata = dev->platform_data;
if (!pdata) {
dev_err(dev, "missing platform_data\n");
return -ENODEV;
}
idata = xzalloc(sizeof(struct twl6030_pwrbtn_internal_data));
idata->recv_fifo = kfifo_alloc(sizeof(int));
if (!idata->recv_fifo) {
dev_err(dev, "out of memory allocating kfifo\n");
free(idata);
return -ENOMEM;
}
idata->code = pdata->code;
idata->twl6030 = twl6030_get();
idata->poller.func = ic2_key_poller;
dev->type_data = &idata->cdev;
idata->cdev.dev = dev;
idata->cdev.tstc = twl6030_pwrbtn_tstc;
idata->cdev.getc = twl6030_pwrbtn_getc;
console_register(&idata->cdev);
return poller_register(&idata->poller);
}
static struct driver_d twl6030_pwrbtn_driver = {
.name = "twl6030_pwrbtn",
.probe = twl6030_pwrbtn_probe,
};
device_platform_driver(twl6030_pwrbtn_driver);
|
