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d3dc6e23 RG |
1 | /* |
2 | * Driver for the IMX SNVS ON/OFF Power Key | |
3 | * Copyright (C) 2015 Freescale Semiconductor, Inc. All Rights Reserved. | |
4 | * | |
5 | * The code contained herein is licensed under the GNU General Public | |
6 | * License. You may obtain a copy of the GNU General Public License | |
7 | * Version 2 or later at the following locations: | |
8 | * | |
9 | * http://www.opensource.org/licenses/gpl-license.html | |
10 | * http://www.gnu.org/copyleft/gpl.html | |
11 | */ | |
12 | ||
13 | #include <linux/device.h> | |
14 | #include <linux/err.h> | |
15 | #include <linux/init.h> | |
16 | #include <linux/input.h> | |
17 | #include <linux/interrupt.h> | |
18 | #include <linux/io.h> | |
19 | #include <linux/jiffies.h> | |
20 | #include <linux/kernel.h> | |
21 | #include <linux/module.h> | |
22 | #include <linux/of.h> | |
23 | #include <linux/of_address.h> | |
24 | #include <linux/platform_device.h> | |
25 | #include <linux/mfd/syscon.h> | |
26 | #include <linux/regmap.h> | |
27 | ||
28 | #define SNVS_LPSR_REG 0x4C /* LP Status Register */ | |
29 | #define SNVS_LPCR_REG 0x38 /* LP Control Register */ | |
30 | #define SNVS_HPSR_REG 0x14 | |
31 | #define SNVS_HPSR_BTN BIT(6) | |
32 | #define SNVS_LPSR_SPO BIT(18) | |
33 | #define SNVS_LPCR_DEP_EN BIT(5) | |
34 | ||
35 | #define DEBOUNCE_TIME 30 | |
36 | #define REPEAT_INTERVAL 60 | |
37 | ||
38 | struct pwrkey_drv_data { | |
39 | struct regmap *snvs; | |
40 | int irq; | |
41 | int keycode; | |
42 | int keystate; /* 1:pressed */ | |
43 | int wakeup; | |
44 | struct timer_list check_timer; | |
45 | struct input_dev *input; | |
46 | }; | |
47 | ||
48 | static void imx_imx_snvs_check_for_events(unsigned long data) | |
49 | { | |
50 | struct pwrkey_drv_data *pdata = (struct pwrkey_drv_data *) data; | |
51 | struct input_dev *input = pdata->input; | |
52 | u32 state; | |
53 | ||
54 | regmap_read(pdata->snvs, SNVS_HPSR_REG, &state); | |
55 | state = state & SNVS_HPSR_BTN ? 1 : 0; | |
56 | ||
57 | /* only report new event if status changed */ | |
58 | if (state ^ pdata->keystate) { | |
59 | pdata->keystate = state; | |
60 | input_event(input, EV_KEY, pdata->keycode, state); | |
61 | input_sync(input); | |
62 | pm_relax(pdata->input->dev.parent); | |
63 | } | |
64 | ||
65 | /* repeat check if pressed long */ | |
66 | if (state) { | |
67 | mod_timer(&pdata->check_timer, | |
68 | jiffies + msecs_to_jiffies(REPEAT_INTERVAL)); | |
69 | } | |
70 | } | |
71 | ||
72 | static irqreturn_t imx_snvs_pwrkey_interrupt(int irq, void *dev_id) | |
73 | { | |
74 | struct platform_device *pdev = dev_id; | |
75 | struct pwrkey_drv_data *pdata = platform_get_drvdata(pdev); | |
76 | u32 lp_status; | |
77 | ||
78 | pm_wakeup_event(pdata->input->dev.parent, 0); | |
79 | ||
80 | regmap_read(pdata->snvs, SNVS_LPSR_REG, &lp_status); | |
81 | if (lp_status & SNVS_LPSR_SPO) | |
82 | mod_timer(&pdata->check_timer, jiffies + msecs_to_jiffies(DEBOUNCE_TIME)); | |
83 | ||
84 | /* clear SPO status */ | |
85 | regmap_write(pdata->snvs, SNVS_LPSR_REG, SNVS_LPSR_SPO); | |
86 | ||
87 | return IRQ_HANDLED; | |
88 | } | |
89 | ||
90 | static void imx_snvs_pwrkey_act(void *pdata) | |
91 | { | |
92 | struct pwrkey_drv_data *pd = pdata; | |
93 | ||
94 | del_timer_sync(&pd->check_timer); | |
95 | } | |
96 | ||
97 | static int imx_snvs_pwrkey_probe(struct platform_device *pdev) | |
98 | { | |
99 | struct pwrkey_drv_data *pdata = NULL; | |
100 | struct input_dev *input = NULL; | |
101 | struct device_node *np; | |
102 | int error; | |
103 | ||
104 | /* Get SNVS register Page */ | |
105 | np = pdev->dev.of_node; | |
106 | if (!np) | |
107 | return -ENODEV; | |
108 | ||
109 | pdata = devm_kzalloc(&pdev->dev, sizeof(*pdata), GFP_KERNEL); | |
110 | if (!pdata) | |
111 | return -ENOMEM; | |
112 | ||
9ace41ad | 113 | pdata->snvs = syscon_regmap_lookup_by_phandle(np, "regmap"); |
9979c1c7 | 114 | if (IS_ERR(pdata->snvs)) { |
d3dc6e23 | 115 | dev_err(&pdev->dev, "Can't get snvs syscon\n"); |
9979c1c7 | 116 | return PTR_ERR(pdata->snvs); |
d3dc6e23 RG |
117 | } |
118 | ||
119 | if (of_property_read_u32(np, "linux,keycode", &pdata->keycode)) { | |
120 | pdata->keycode = KEY_POWER; | |
121 | dev_warn(&pdev->dev, "KEY_POWER without setting in dts\n"); | |
122 | } | |
123 | ||
def56bba | 124 | pdata->wakeup = of_property_read_bool(np, "wakeup-source"); |
d3dc6e23 RG |
125 | |
126 | pdata->irq = platform_get_irq(pdev, 0); | |
127 | if (pdata->irq < 0) { | |
128 | dev_err(&pdev->dev, "no irq defined in platform data\n"); | |
129 | return -EINVAL; | |
130 | } | |
131 | ||
132 | regmap_update_bits(pdata->snvs, SNVS_LPCR_REG, SNVS_LPCR_DEP_EN, SNVS_LPCR_DEP_EN); | |
133 | ||
134 | /* clear the unexpected interrupt before driver ready */ | |
135 | regmap_write(pdata->snvs, SNVS_LPSR_REG, SNVS_LPSR_SPO); | |
136 | ||
137 | setup_timer(&pdata->check_timer, | |
138 | imx_imx_snvs_check_for_events, (unsigned long) pdata); | |
139 | ||
140 | input = devm_input_allocate_device(&pdev->dev); | |
141 | if (!input) { | |
142 | dev_err(&pdev->dev, "failed to allocate the input device\n"); | |
143 | return -ENOMEM; | |
144 | } | |
145 | ||
146 | input->name = pdev->name; | |
147 | input->phys = "snvs-pwrkey/input0"; | |
148 | input->id.bustype = BUS_HOST; | |
149 | ||
150 | input_set_capability(input, EV_KEY, pdata->keycode); | |
151 | ||
152 | /* input customer action to cancel release timer */ | |
153 | error = devm_add_action(&pdev->dev, imx_snvs_pwrkey_act, pdata); | |
154 | if (error) { | |
155 | dev_err(&pdev->dev, "failed to register remove action\n"); | |
156 | return error; | |
157 | } | |
158 | ||
159 | error = devm_request_irq(&pdev->dev, pdata->irq, | |
160 | imx_snvs_pwrkey_interrupt, | |
161 | 0, pdev->name, pdev); | |
162 | ||
163 | if (error) { | |
164 | dev_err(&pdev->dev, "interrupt not available.\n"); | |
165 | return error; | |
166 | } | |
167 | ||
168 | error = input_register_device(input); | |
169 | if (error < 0) { | |
170 | dev_err(&pdev->dev, "failed to register input device\n"); | |
d3dc6e23 RG |
171 | return error; |
172 | } | |
173 | ||
174 | pdata->input = input; | |
175 | platform_set_drvdata(pdev, pdata); | |
176 | ||
177 | device_init_wakeup(&pdev->dev, pdata->wakeup); | |
178 | ||
179 | return 0; | |
180 | } | |
181 | ||
2d1a7923 | 182 | static int __maybe_unused imx_snvs_pwrkey_suspend(struct device *dev) |
d3dc6e23 RG |
183 | { |
184 | struct platform_device *pdev = to_platform_device(dev); | |
185 | struct pwrkey_drv_data *pdata = platform_get_drvdata(pdev); | |
186 | ||
187 | if (device_may_wakeup(&pdev->dev)) | |
188 | enable_irq_wake(pdata->irq); | |
189 | ||
190 | return 0; | |
191 | } | |
192 | ||
2d1a7923 | 193 | static int __maybe_unused imx_snvs_pwrkey_resume(struct device *dev) |
d3dc6e23 RG |
194 | { |
195 | struct platform_device *pdev = to_platform_device(dev); | |
196 | struct pwrkey_drv_data *pdata = platform_get_drvdata(pdev); | |
197 | ||
198 | if (device_may_wakeup(&pdev->dev)) | |
199 | disable_irq_wake(pdata->irq); | |
200 | ||
201 | return 0; | |
202 | } | |
203 | ||
204 | static const struct of_device_id imx_snvs_pwrkey_ids[] = { | |
205 | { .compatible = "fsl,sec-v4.0-pwrkey" }, | |
206 | { /* sentinel */ } | |
207 | }; | |
208 | MODULE_DEVICE_TABLE(of, imx_snvs_pwrkey_ids); | |
209 | ||
210 | static SIMPLE_DEV_PM_OPS(imx_snvs_pwrkey_pm_ops, imx_snvs_pwrkey_suspend, | |
211 | imx_snvs_pwrkey_resume); | |
212 | ||
213 | static struct platform_driver imx_snvs_pwrkey_driver = { | |
214 | .driver = { | |
215 | .name = "snvs_pwrkey", | |
216 | .pm = &imx_snvs_pwrkey_pm_ops, | |
217 | .of_match_table = imx_snvs_pwrkey_ids, | |
218 | }, | |
219 | .probe = imx_snvs_pwrkey_probe, | |
220 | }; | |
221 | module_platform_driver(imx_snvs_pwrkey_driver); | |
222 | ||
223 | MODULE_AUTHOR("Freescale Semiconductor"); | |
224 | MODULE_DESCRIPTION("i.MX snvs power key Driver"); | |
225 | MODULE_LICENSE("GPL"); |