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
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
|
/*
* Driver for the IMX SNVS ON/OFF Power Key
* Copyright (C) 2015 Freescale Semiconductor, Inc. All Rights Reserved.
*
* The code contained herein is licensed under the GNU General Public
* License. You may obtain a copy of the GNU General Public License
* Version 2 or later at the following locations:
*
* http://www.opensource.org/licenses/gpl-license.html
* http://www.gnu.org/copyleft/gpl.html
*/
#include <linux/device.h>
#include <linux/err.h>
#include <linux/init.h>
#include <linux/input.h>
#include <linux/interrupt.h>
#include <linux/io.h>
#include <linux/jiffies.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/of.h>
#include <linux/of_address.h>
#include <linux/platform_device.h>
#include <linux/mfd/syscon.h>
#include <linux/regmap.h>
#define SNVS_LPSR_REG 0x4C /* LP Status Register */
#define SNVS_LPCR_REG 0x38 /* LP Control Register */
#define SNVS_HPSR_REG 0x14
#define SNVS_HPSR_BTN BIT(6)
#define SNVS_LPSR_SPO BIT(18)
#define SNVS_LPCR_DEP_EN BIT(5)
#define DEBOUNCE_TIME 30
#define REPEAT_INTERVAL 60
struct pwrkey_drv_data {
struct regmap *snvs;
int irq;
int keycode;
int keystate; /* 1:pressed */
int wakeup;
struct timer_list check_timer;
struct input_dev *input;
};
static void imx_imx_snvs_check_for_events(struct timer_list *t)
{
struct pwrkey_drv_data *pdata = from_timer(pdata, t, check_timer);
struct input_dev *input = pdata->input;
u32 state;
regmap_read(pdata->snvs, SNVS_HPSR_REG, &state);
state = state & SNVS_HPSR_BTN ? 1 : 0;
/* only report new event if status changed */
if (state ^ pdata->keystate) {
pdata->keystate = state;
input_event(input, EV_KEY, pdata->keycode, state);
input_sync(input);
pm_relax(pdata->input->dev.parent);
}
/* repeat check if pressed long */
if (state) {
mod_timer(&pdata->check_timer,
jiffies + msecs_to_jiffies(REPEAT_INTERVAL));
}
}
static irqreturn_t imx_snvs_pwrkey_interrupt(int irq, void *dev_id)
{
struct platform_device *pdev = dev_id;
struct pwrkey_drv_data *pdata = platform_get_drvdata(pdev);
u32 lp_status;
pm_wakeup_event(pdata->input->dev.parent, 0);
regmap_read(pdata->snvs, SNVS_LPSR_REG, &lp_status);
if (lp_status & SNVS_LPSR_SPO)
mod_timer(&pdata->check_timer, jiffies + msecs_to_jiffies(DEBOUNCE_TIME));
/* clear SPO status */
regmap_write(pdata->snvs, SNVS_LPSR_REG, SNVS_LPSR_SPO);
return IRQ_HANDLED;
}
static void imx_snvs_pwrkey_act(void *pdata)
{
struct pwrkey_drv_data *pd = pdata;
del_timer_sync(&pd->check_timer);
}
static int imx_snvs_pwrkey_probe(struct platform_device *pdev)
{
struct pwrkey_drv_data *pdata = NULL;
struct input_dev *input = NULL;
struct device_node *np;
int error;
/* Get SNVS register Page */
np = pdev->dev.of_node;
if (!np)
return -ENODEV;
pdata = devm_kzalloc(&pdev->dev, sizeof(*pdata), GFP_KERNEL);
if (!pdata)
return -ENOMEM;
pdata->snvs = syscon_regmap_lookup_by_phandle(np, "regmap");
if (IS_ERR(pdata->snvs)) {
dev_err(&pdev->dev, "Can't get snvs syscon\n");
return PTR_ERR(pdata->snvs);
}
if (of_property_read_u32(np, "linux,keycode", &pdata->keycode)) {
pdata->keycode = KEY_POWER;
dev_warn(&pdev->dev, "KEY_POWER without setting in dts\n");
}
pdata->wakeup = of_property_read_bool(np, "wakeup-source");
pdata->irq = platform_get_irq(pdev, 0);
if (pdata->irq < 0) {
dev_err(&pdev->dev, "no irq defined in platform data\n");
return -EINVAL;
}
regmap_update_bits(pdata->snvs, SNVS_LPCR_REG, SNVS_LPCR_DEP_EN, SNVS_LPCR_DEP_EN);
/* clear the unexpected interrupt before driver ready */
regmap_write(pdata->snvs, SNVS_LPSR_REG, SNVS_LPSR_SPO);
timer_setup(&pdata->check_timer, imx_imx_snvs_check_for_events, 0);
input = devm_input_allocate_device(&pdev->dev);
if (!input) {
dev_err(&pdev->dev, "failed to allocate the input device\n");
return -ENOMEM;
}
input->name = pdev->name;
input->phys = "snvs-pwrkey/input0";
input->id.bustype = BUS_HOST;
input_set_capability(input, EV_KEY, pdata->keycode);
/* input customer action to cancel release timer */
error = devm_add_action(&pdev->dev, imx_snvs_pwrkey_act, pdata);
if (error) {
dev_err(&pdev->dev, "failed to register remove action\n");
return error;
}
error = devm_request_irq(&pdev->dev, pdata->irq,
imx_snvs_pwrkey_interrupt,
0, pdev->name, pdev);
if (error) {
dev_err(&pdev->dev, "interrupt not available.\n");
return error;
}
error = input_register_device(input);
if (error < 0) {
dev_err(&pdev->dev, "failed to register input device\n");
return error;
}
pdata->input = input;
platform_set_drvdata(pdev, pdata);
device_init_wakeup(&pdev->dev, pdata->wakeup);
return 0;
}
static int __maybe_unused imx_snvs_pwrkey_suspend(struct device *dev)
{
struct platform_device *pdev = to_platform_device(dev);
struct pwrkey_drv_data *pdata = platform_get_drvdata(pdev);
if (device_may_wakeup(&pdev->dev))
enable_irq_wake(pdata->irq);
return 0;
}
static int __maybe_unused imx_snvs_pwrkey_resume(struct device *dev)
{
struct platform_device *pdev = to_platform_device(dev);
struct pwrkey_drv_data *pdata = platform_get_drvdata(pdev);
if (device_may_wakeup(&pdev->dev))
disable_irq_wake(pdata->irq);
return 0;
}
static const struct of_device_id imx_snvs_pwrkey_ids[] = {
{ .compatible = "fsl,sec-v4.0-pwrkey" },
{ /* sentinel */ }
};
MODULE_DEVICE_TABLE(of, imx_snvs_pwrkey_ids);
static SIMPLE_DEV_PM_OPS(imx_snvs_pwrkey_pm_ops, imx_snvs_pwrkey_suspend,
imx_snvs_pwrkey_resume);
static struct platform_driver imx_snvs_pwrkey_driver = {
.driver = {
.name = "snvs_pwrkey",
.pm = &imx_snvs_pwrkey_pm_ops,
.of_match_table = imx_snvs_pwrkey_ids,
},
.probe = imx_snvs_pwrkey_probe,
};
module_platform_driver(imx_snvs_pwrkey_driver);
MODULE_AUTHOR("Freescale Semiconductor");
MODULE_DESCRIPTION("i.MX snvs power key Driver");
MODULE_LICENSE("GPL");
|
