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
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
|
// SPDX-License-Identifier: GPL-2.0-or-later
/*
* Power key driver for SiRF PrimaII
*
* Copyright (c) 2013 - 2014 Cambridge Silicon Radio Limited, a CSR plc group
* company.
*/
#include <linux/module.h>
#include <linux/interrupt.h>
#include <linux/delay.h>
#include <linux/platform_device.h>
#include <linux/input.h>
#include <linux/rtc/sirfsoc_rtciobrg.h>
#include <linux/of.h>
#include <linux/workqueue.h>
struct sirfsoc_pwrc_drvdata {
u32 pwrc_base;
struct input_dev *input;
struct delayed_work work;
};
#define PWRC_ON_KEY_BIT (1 << 0)
#define PWRC_INT_STATUS 0xc
#define PWRC_INT_MASK 0x10
#define PWRC_PIN_STATUS 0x14
#define PWRC_KEY_DETECT_UP_TIME 20 /* ms*/
static int sirfsoc_pwrc_is_on_key_down(struct sirfsoc_pwrc_drvdata *pwrcdrv)
{
u32 state = sirfsoc_rtc_iobrg_readl(pwrcdrv->pwrc_base +
PWRC_PIN_STATUS);
return !(state & PWRC_ON_KEY_BIT); /* ON_KEY is active low */
}
static void sirfsoc_pwrc_report_event(struct work_struct *work)
{
struct sirfsoc_pwrc_drvdata *pwrcdrv =
container_of(work, struct sirfsoc_pwrc_drvdata, work.work);
if (sirfsoc_pwrc_is_on_key_down(pwrcdrv)) {
schedule_delayed_work(&pwrcdrv->work,
msecs_to_jiffies(PWRC_KEY_DETECT_UP_TIME));
} else {
input_event(pwrcdrv->input, EV_KEY, KEY_POWER, 0);
input_sync(pwrcdrv->input);
}
}
static irqreturn_t sirfsoc_pwrc_isr(int irq, void *dev_id)
{
struct sirfsoc_pwrc_drvdata *pwrcdrv = dev_id;
u32 int_status;
int_status = sirfsoc_rtc_iobrg_readl(pwrcdrv->pwrc_base +
PWRC_INT_STATUS);
sirfsoc_rtc_iobrg_writel(int_status & ~PWRC_ON_KEY_BIT,
pwrcdrv->pwrc_base + PWRC_INT_STATUS);
input_event(pwrcdrv->input, EV_KEY, KEY_POWER, 1);
input_sync(pwrcdrv->input);
schedule_delayed_work(&pwrcdrv->work,
msecs_to_jiffies(PWRC_KEY_DETECT_UP_TIME));
return IRQ_HANDLED;
}
static void sirfsoc_pwrc_toggle_interrupts(struct sirfsoc_pwrc_drvdata *pwrcdrv,
bool enable)
{
u32 int_mask;
int_mask = sirfsoc_rtc_iobrg_readl(pwrcdrv->pwrc_base + PWRC_INT_MASK);
if (enable)
int_mask |= PWRC_ON_KEY_BIT;
else
int_mask &= ~PWRC_ON_KEY_BIT;
sirfsoc_rtc_iobrg_writel(int_mask, pwrcdrv->pwrc_base + PWRC_INT_MASK);
}
static int sirfsoc_pwrc_open(struct input_dev *input)
{
struct sirfsoc_pwrc_drvdata *pwrcdrv = input_get_drvdata(input);
sirfsoc_pwrc_toggle_interrupts(pwrcdrv, true);
return 0;
}
static void sirfsoc_pwrc_close(struct input_dev *input)
{
struct sirfsoc_pwrc_drvdata *pwrcdrv = input_get_drvdata(input);
sirfsoc_pwrc_toggle_interrupts(pwrcdrv, false);
cancel_delayed_work_sync(&pwrcdrv->work);
}
static const struct of_device_id sirfsoc_pwrc_of_match[] = {
{ .compatible = "sirf,prima2-pwrc" },
{},
};
MODULE_DEVICE_TABLE(of, sirfsoc_pwrc_of_match);
static int sirfsoc_pwrc_probe(struct platform_device *pdev)
{
struct device_node *np = pdev->dev.of_node;
struct sirfsoc_pwrc_drvdata *pwrcdrv;
int irq;
int error;
pwrcdrv = devm_kzalloc(&pdev->dev, sizeof(struct sirfsoc_pwrc_drvdata),
GFP_KERNEL);
if (!pwrcdrv) {
dev_info(&pdev->dev, "Not enough memory for the device data\n");
return -ENOMEM;
}
/*
* We can't use of_iomap because pwrc is not mapped in memory,
* the so-called base address is only offset in rtciobrg
*/
error = of_property_read_u32(np, "reg", &pwrcdrv->pwrc_base);
if (error) {
dev_err(&pdev->dev,
"unable to find base address of pwrc node in dtb\n");
return error;
}
pwrcdrv->input = devm_input_allocate_device(&pdev->dev);
if (!pwrcdrv->input)
return -ENOMEM;
pwrcdrv->input->name = "sirfsoc pwrckey";
pwrcdrv->input->phys = "pwrc/input0";
pwrcdrv->input->evbit[0] = BIT_MASK(EV_KEY);
input_set_capability(pwrcdrv->input, EV_KEY, KEY_POWER);
INIT_DELAYED_WORK(&pwrcdrv->work, sirfsoc_pwrc_report_event);
pwrcdrv->input->open = sirfsoc_pwrc_open;
pwrcdrv->input->close = sirfsoc_pwrc_close;
input_set_drvdata(pwrcdrv->input, pwrcdrv);
/* Make sure the device is quiesced */
sirfsoc_pwrc_toggle_interrupts(pwrcdrv, false);
irq = platform_get_irq(pdev, 0);
error = devm_request_irq(&pdev->dev, irq,
sirfsoc_pwrc_isr, 0,
"sirfsoc_pwrc_int", pwrcdrv);
if (error) {
dev_err(&pdev->dev, "unable to claim irq %d, error: %d\n",
irq, error);
return error;
}
error = input_register_device(pwrcdrv->input);
if (error) {
dev_err(&pdev->dev,
"unable to register input device, error: %d\n",
error);
return error;
}
dev_set_drvdata(&pdev->dev, pwrcdrv);
device_init_wakeup(&pdev->dev, 1);
return 0;
}
static int __maybe_unused sirfsoc_pwrc_resume(struct device *dev)
{
struct sirfsoc_pwrc_drvdata *pwrcdrv = dev_get_drvdata(dev);
struct input_dev *input = pwrcdrv->input;
/*
* Do not mask pwrc interrupt as we want pwrc work as a wakeup source
* if users touch X_ONKEY_B, see arch/arm/mach-prima2/pm.c
*/
mutex_lock(&input->mutex);
if (input_device_enabled(input))
sirfsoc_pwrc_toggle_interrupts(pwrcdrv, true);
mutex_unlock(&input->mutex);
return 0;
}
static SIMPLE_DEV_PM_OPS(sirfsoc_pwrc_pm_ops, NULL, sirfsoc_pwrc_resume);
static struct platform_driver sirfsoc_pwrc_driver = {
.probe = sirfsoc_pwrc_probe,
.driver = {
.name = "sirfsoc-pwrc",
.pm = &sirfsoc_pwrc_pm_ops,
.of_match_table = sirfsoc_pwrc_of_match,
}
};
module_platform_driver(sirfsoc_pwrc_driver);
MODULE_LICENSE("GPL v2");
MODULE_AUTHOR("Binghua Duan <Binghua.Duan@csr.com>, Xianglong Du <Xianglong.Du@csr.com>");
MODULE_DESCRIPTION("CSR Prima2 PWRC Driver");
MODULE_ALIAS("platform:sirfsoc-pwrc");
|
