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1// SPDX-License-Identifier: GPL-2.0+
2//
3// Driver for the IMX SNVS ON/OFF Power Key
4// Copyright (C) 2015 Freescale Semiconductor, Inc. All Rights Reserved.
5
6#include <linux/device.h>
7#include <linux/err.h>
8#include <linux/init.h>
9#include <linux/input.h>
10#include <linux/interrupt.h>
11#include <linux/io.h>
12#include <linux/jiffies.h>
13#include <linux/kernel.h>
14#include <linux/module.h>
15#include <linux/of.h>
16#include <linux/of_address.h>
17#include <linux/platform_device.h>
18#include <linux/mfd/syscon.h>
19#include <linux/regmap.h>
20
21#define SNVS_LPSR_REG 0x4C /* LP Status Register */
22#define SNVS_LPCR_REG 0x38 /* LP Control Register */
23#define SNVS_HPSR_REG 0x14
24#define SNVS_HPSR_BTN BIT(6)
25#define SNVS_LPSR_SPO BIT(18)
26#define SNVS_LPCR_DEP_EN BIT(5)
27
28#define DEBOUNCE_TIME 30
29#define REPEAT_INTERVAL 60
30
31struct pwrkey_drv_data {
32 struct regmap *snvs;
33 int irq;
34 int keycode;
35 int keystate; /* 1:pressed */
36 int wakeup;
37 struct timer_list check_timer;
38 struct input_dev *input;
39};
40
41static void imx_imx_snvs_check_for_events(struct timer_list *t)
42{
43 struct pwrkey_drv_data *pdata = from_timer(pdata, t, check_timer);
44 struct input_dev *input = pdata->input;
45 u32 state;
46
47 regmap_read(pdata->snvs, SNVS_HPSR_REG, &state);
48 state = state & SNVS_HPSR_BTN ? 1 : 0;
49
50 /* only report new event if status changed */
51 if (state ^ pdata->keystate) {
52 pdata->keystate = state;
53 input_event(input, EV_KEY, pdata->keycode, state);
54 input_sync(input);
55 pm_relax(pdata->input->dev.parent);
56 }
57
58 /* repeat check if pressed long */
59 if (state) {
60 mod_timer(&pdata->check_timer,
61 jiffies + msecs_to_jiffies(REPEAT_INTERVAL));
62 }
63}
64
65static irqreturn_t imx_snvs_pwrkey_interrupt(int irq, void *dev_id)
66{
67 struct platform_device *pdev = dev_id;
68 struct pwrkey_drv_data *pdata = platform_get_drvdata(pdev);
69 u32 lp_status;
70
71 pm_wakeup_event(pdata->input->dev.parent, 0);
72
73 regmap_read(pdata->snvs, SNVS_LPSR_REG, &lp_status);
74 if (lp_status & SNVS_LPSR_SPO)
75 mod_timer(&pdata->check_timer, jiffies + msecs_to_jiffies(DEBOUNCE_TIME));
76
77 /* clear SPO status */
78 regmap_write(pdata->snvs, SNVS_LPSR_REG, SNVS_LPSR_SPO);
79
80 return IRQ_HANDLED;
81}
82
83static void imx_snvs_pwrkey_act(void *pdata)
84{
85 struct pwrkey_drv_data *pd = pdata;
86
87 del_timer_sync(&pd->check_timer);
88}
89
90static int imx_snvs_pwrkey_probe(struct platform_device *pdev)
91{
92 struct pwrkey_drv_data *pdata = NULL;
93 struct input_dev *input = NULL;
94 struct device_node *np;
95 int error;
96
97 /* Get SNVS register Page */
98 np = pdev->dev.of_node;
99 if (!np)
100 return -ENODEV;
101
102 pdata = devm_kzalloc(&pdev->dev, sizeof(*pdata), GFP_KERNEL);
103 if (!pdata)
104 return -ENOMEM;
105
106 pdata->snvs = syscon_regmap_lookup_by_phandle(np, "regmap");
107 if (IS_ERR(pdata->snvs)) {
108 dev_err(&pdev->dev, "Can't get snvs syscon\n");
109 return PTR_ERR(pdata->snvs);
110 }
111
112 if (of_property_read_u32(np, "linux,keycode", &pdata->keycode)) {
113 pdata->keycode = KEY_POWER;
114 dev_warn(&pdev->dev, "KEY_POWER without setting in dts\n");
115 }
116
117 pdata->wakeup = of_property_read_bool(np, "wakeup-source");
118
119 pdata->irq = platform_get_irq(pdev, 0);
120 if (pdata->irq < 0) {
121 dev_err(&pdev->dev, "no irq defined in platform data\n");
122 return -EINVAL;
123 }
124
125 regmap_update_bits(pdata->snvs, SNVS_LPCR_REG, SNVS_LPCR_DEP_EN, SNVS_LPCR_DEP_EN);
126
127 /* clear the unexpected interrupt before driver ready */
128 regmap_write(pdata->snvs, SNVS_LPSR_REG, SNVS_LPSR_SPO);
129
130 timer_setup(&pdata->check_timer, imx_imx_snvs_check_for_events, 0);
131
132 input = devm_input_allocate_device(&pdev->dev);
133 if (!input) {
134 dev_err(&pdev->dev, "failed to allocate the input device\n");
135 return -ENOMEM;
136 }
137
138 input->name = pdev->name;
139 input->phys = "snvs-pwrkey/input0";
140 input->id.bustype = BUS_HOST;
141
142 input_set_capability(input, EV_KEY, pdata->keycode);
143
144 /* input customer action to cancel release timer */
145 error = devm_add_action(&pdev->dev, imx_snvs_pwrkey_act, pdata);
146 if (error) {
147 dev_err(&pdev->dev, "failed to register remove action\n");
148 return error;
149 }
150
151 error = devm_request_irq(&pdev->dev, pdata->irq,
152 imx_snvs_pwrkey_interrupt,
153 0, pdev->name, pdev);
154
155 if (error) {
156 dev_err(&pdev->dev, "interrupt not available.\n");
157 return error;
158 }
159
160 error = input_register_device(input);
161 if (error < 0) {
162 dev_err(&pdev->dev, "failed to register input device\n");
163 return error;
164 }
165
166 pdata->input = input;
167 platform_set_drvdata(pdev, pdata);
168
169 device_init_wakeup(&pdev->dev, pdata->wakeup);
170
171 return 0;
172}
173
174static int __maybe_unused imx_snvs_pwrkey_suspend(struct device *dev)
175{
176 struct platform_device *pdev = to_platform_device(dev);
177 struct pwrkey_drv_data *pdata = platform_get_drvdata(pdev);
178
179 if (device_may_wakeup(&pdev->dev))
180 enable_irq_wake(pdata->irq);
181
182 return 0;
183}
184
185static int __maybe_unused imx_snvs_pwrkey_resume(struct device *dev)
186{
187 struct platform_device *pdev = to_platform_device(dev);
188 struct pwrkey_drv_data *pdata = platform_get_drvdata(pdev);
189
190 if (device_may_wakeup(&pdev->dev))
191 disable_irq_wake(pdata->irq);
192
193 return 0;
194}
195
196static const struct of_device_id imx_snvs_pwrkey_ids[] = {
197 { .compatible = "fsl,sec-v4.0-pwrkey" },
198 { /* sentinel */ }
199};
200MODULE_DEVICE_TABLE(of, imx_snvs_pwrkey_ids);
201
202static SIMPLE_DEV_PM_OPS(imx_snvs_pwrkey_pm_ops, imx_snvs_pwrkey_suspend,
203 imx_snvs_pwrkey_resume);
204
205static struct platform_driver imx_snvs_pwrkey_driver = {
206 .driver = {
207 .name = "snvs_pwrkey",
208 .pm = &imx_snvs_pwrkey_pm_ops,
209 .of_match_table = imx_snvs_pwrkey_ids,
210 },
211 .probe = imx_snvs_pwrkey_probe,
212};
213module_platform_driver(imx_snvs_pwrkey_driver);
214
215MODULE_AUTHOR("Freescale Semiconductor");
216MODULE_DESCRIPTION("i.MX snvs power key Driver");
217MODULE_LICENSE("GPL");
218

Warning: That file was not part of the compilation database. It may have many parsing errors.