This source file includes following definitions.
- imx_imx_snvs_check_for_events
- imx_snvs_pwrkey_interrupt
- imx_snvs_pwrkey_act
- imx_snvs_pwrkey_probe
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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/pm_wakeirq.h>
19 #include <linux/mfd/syscon.h>
20 #include <linux/regmap.h>
21
22 #define SNVS_LPSR_REG 0x4C
23 #define SNVS_LPCR_REG 0x38
24 #define SNVS_HPSR_REG 0x14
25 #define SNVS_HPSR_BTN BIT(6)
26 #define SNVS_LPSR_SPO BIT(18)
27 #define SNVS_LPCR_DEP_EN BIT(5)
28
29 #define DEBOUNCE_TIME 30
30 #define REPEAT_INTERVAL 60
31
32 struct pwrkey_drv_data {
33 struct regmap *snvs;
34 int irq;
35 int keycode;
36 int keystate;
37 int wakeup;
38 struct timer_list check_timer;
39 struct input_dev *input;
40 };
41
42 static void imx_imx_snvs_check_for_events(struct timer_list *t)
43 {
44 struct pwrkey_drv_data *pdata = from_timer(pdata, t, check_timer);
45 struct input_dev *input = pdata->input;
46 u32 state;
47
48 regmap_read(pdata->snvs, SNVS_HPSR_REG, &state);
49 state = state & SNVS_HPSR_BTN ? 1 : 0;
50
51
52 if (state ^ pdata->keystate) {
53 pdata->keystate = state;
54 input_event(input, EV_KEY, pdata->keycode, state);
55 input_sync(input);
56 pm_relax(pdata->input->dev.parent);
57 }
58
59
60 if (state) {
61 mod_timer(&pdata->check_timer,
62 jiffies + msecs_to_jiffies(REPEAT_INTERVAL));
63 }
64 }
65
66 static irqreturn_t imx_snvs_pwrkey_interrupt(int irq, void *dev_id)
67 {
68 struct platform_device *pdev = dev_id;
69 struct pwrkey_drv_data *pdata = platform_get_drvdata(pdev);
70 u32 lp_status;
71
72 pm_wakeup_event(pdata->input->dev.parent, 0);
73
74 regmap_read(pdata->snvs, SNVS_LPSR_REG, &lp_status);
75 if (lp_status & SNVS_LPSR_SPO)
76 mod_timer(&pdata->check_timer, jiffies + msecs_to_jiffies(DEBOUNCE_TIME));
77
78
79 regmap_write(pdata->snvs, SNVS_LPSR_REG, SNVS_LPSR_SPO);
80
81 return IRQ_HANDLED;
82 }
83
84 static void imx_snvs_pwrkey_act(void *pdata)
85 {
86 struct pwrkey_drv_data *pd = pdata;
87
88 del_timer_sync(&pd->check_timer);
89 }
90
91 static int imx_snvs_pwrkey_probe(struct platform_device *pdev)
92 {
93 struct pwrkey_drv_data *pdata = NULL;
94 struct input_dev *input = NULL;
95 struct device_node *np;
96 int error;
97
98
99 np = pdev->dev.of_node;
100 if (!np)
101 return -ENODEV;
102
103 pdata = devm_kzalloc(&pdev->dev, sizeof(*pdata), GFP_KERNEL);
104 if (!pdata)
105 return -ENOMEM;
106
107 pdata->snvs = syscon_regmap_lookup_by_phandle(np, "regmap");
108 if (IS_ERR(pdata->snvs)) {
109 dev_err(&pdev->dev, "Can't get snvs syscon\n");
110 return PTR_ERR(pdata->snvs);
111 }
112
113 if (of_property_read_u32(np, "linux,keycode", &pdata->keycode)) {
114 pdata->keycode = KEY_POWER;
115 dev_warn(&pdev->dev, "KEY_POWER without setting in dts\n");
116 }
117
118 pdata->wakeup = of_property_read_bool(np, "wakeup-source");
119
120 pdata->irq = platform_get_irq(pdev, 0);
121 if (pdata->irq < 0)
122 return -EINVAL;
123
124 regmap_update_bits(pdata->snvs, SNVS_LPCR_REG, SNVS_LPCR_DEP_EN, SNVS_LPCR_DEP_EN);
125
126
127 regmap_write(pdata->snvs, SNVS_LPSR_REG, SNVS_LPSR_SPO);
128
129 timer_setup(&pdata->check_timer, imx_imx_snvs_check_for_events, 0);
130
131 input = devm_input_allocate_device(&pdev->dev);
132 if (!input) {
133 dev_err(&pdev->dev, "failed to allocate the input device\n");
134 return -ENOMEM;
135 }
136
137 input->name = pdev->name;
138 input->phys = "snvs-pwrkey/input0";
139 input->id.bustype = BUS_HOST;
140
141 input_set_capability(input, EV_KEY, pdata->keycode);
142
143
144 error = devm_add_action(&pdev->dev, imx_snvs_pwrkey_act, pdata);
145 if (error) {
146 dev_err(&pdev->dev, "failed to register remove action\n");
147 return error;
148 }
149
150 pdata->input = input;
151 platform_set_drvdata(pdev, pdata);
152
153 error = devm_request_irq(&pdev->dev, pdata->irq,
154 imx_snvs_pwrkey_interrupt,
155 0, pdev->name, pdev);
156
157 if (error) {
158 dev_err(&pdev->dev, "interrupt not available.\n");
159 return error;
160 }
161
162 error = input_register_device(input);
163 if (error < 0) {
164 dev_err(&pdev->dev, "failed to register input device\n");
165 return error;
166 }
167
168 device_init_wakeup(&pdev->dev, pdata->wakeup);
169 error = dev_pm_set_wake_irq(&pdev->dev, pdata->irq);
170 if (error)
171 dev_err(&pdev->dev, "irq wake enable failed.\n");
172
173 return 0;
174 }
175
176 static const struct of_device_id imx_snvs_pwrkey_ids[] = {
177 { .compatible = "fsl,sec-v4.0-pwrkey" },
178 { }
179 };
180 MODULE_DEVICE_TABLE(of, imx_snvs_pwrkey_ids);
181
182 static struct platform_driver imx_snvs_pwrkey_driver = {
183 .driver = {
184 .name = "snvs_pwrkey",
185 .of_match_table = imx_snvs_pwrkey_ids,
186 },
187 .probe = imx_snvs_pwrkey_probe,
188 };
189 module_platform_driver(imx_snvs_pwrkey_driver);
190
191 MODULE_AUTHOR("Freescale Semiconductor");
192 MODULE_DESCRIPTION("i.MX snvs power key Driver");
193 MODULE_LICENSE("GPL");