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| 2 | |
| 3 | * CPCAP Power Button Input Driver
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| 4 | *
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| 5 | * Copyright (C) 2017 Sebastian Reichel <[email protected]>
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| 6 |
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| 7 |
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| 8 | #include <linux/module.h>
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| 9 | #include <linux/init.h>
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| 10 | #include <linux/kernel.h>
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| 11 | #include <linux/errno.h>
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| 12 | #include <linux/input.h>
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| 13 | #include <linux/interrupt.h>
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| 14 | #include <linux/regmap.h>
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| 15 | #include <linux/of.h>
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| 16 | #include <linux/platform_device.h>
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| 17 | #include <linux/mfd/motorola-cpcap.h>
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| 18 |
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| 19 | #define CPCAP_IRQ_ON 23
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| 20 | #define CPCAP_IRQ_ON_BITMASK (1 << (CPCAP_IRQ_ON % 16))
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| 21 |
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| 22 | struct cpcap_power_button {
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| 23 | struct regmap *regmap;
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| 24 | struct input_dev *idev;
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| 25 | struct device *dev;
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| 26 | };
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| 27 |
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| 28 | static irqreturn_t powerbutton_irq(int irq, void *_button)
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| 29 | {
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| 30 | struct cpcap_power_button *button = _button;
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| 31 | int val;
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| 32 |
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| 33 | val = cpcap_sense_virq(button->regmap, irq);
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| 34 | if (val < 0) {
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| 35 | dev_err(button->dev, "irq read failed: %d", val);
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| 36 | return IRQ_HANDLED;
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| 37 | }
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| 38 |
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| 39 | pm_wakeup_event(button->dev, 0);
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| 40 | input_report_key(button->idev, KEY_POWER, val);
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| 41 | input_sync(button->idev);
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| 42 |
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| 43 | return IRQ_HANDLED;
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| 44 | }
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| 45 |
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| 46 | static int cpcap_power_button_probe(struct platform_device *pdev)
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| 47 | {
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| 48 | struct cpcap_power_button *button;
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| 49 | int irq;
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| 50 | int err;
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| 51 |
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| 52 | irq = platform_get_irq(pdev, 0);
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| 53 | if (irq < 0)
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| 54 | return irq;
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| 55 |
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| 56 | button = devm_kmalloc(&pdev->dev, sizeof(*button), GFP_KERNEL);
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| 57 | if (!button)
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| 58 | return -ENOMEM;
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| 59 |
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| 60 | button->idev = devm_input_allocate_device(&pdev->dev);
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| 61 | if (!button->idev)
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| 62 | return -ENOMEM;
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| 63 |
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| 64 | button->regmap = dev_get_regmap(pdev->dev.parent, NULL);
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| 65 | if (!button->regmap)
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| 66 | return -ENODEV;
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| 67 |
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| 68 | button->dev = &pdev->dev;
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| 69 |
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| 70 | button->idev->name = "cpcap-pwrbutton";
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| 71 | button->idev->phys = "cpcap-pwrbutton/input0";
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| 72 | input_set_capability(button->idev, EV_KEY, KEY_POWER);
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| 73 |
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| 74 | err = devm_request_threaded_irq(&pdev->dev, irq, NULL,
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| 75 | powerbutton_irq, IRQF_ONESHOT, "cpcap_pwrbutton", button);
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| 76 | if (err < 0) {
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| 77 | dev_err(&pdev->dev, "IRQ request failed: %d\n", err);
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| 78 | return err;
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| 79 | }
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| 80 |
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| 81 | err = input_register_device(button->idev);
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| 82 | if (err) {
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| 83 | dev_err(&pdev->dev, "Input register failed: %d\n", err);
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| 84 | return err;
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| 85 | }
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| 86 |
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| 87 | device_init_wakeup(&pdev->dev, true);
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| 88 |
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| 89 | return 0;
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| 90 | }
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| 91 |
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| 92 | #ifdef CONFIG_OF
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| 93 | static const struct of_device_id cpcap_pwrbutton_dt_match_table[] = {
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| 94 | { .compatible = "motorola,cpcap-pwrbutton" },
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| 95 | {},
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| 96 | };
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| 97 | MODULE_DEVICE_TABLE(of, cpcap_pwrbutton_dt_match_table);
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| 98 | #endif
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| 99 |
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| 100 | static struct platform_driver cpcap_power_button_driver = {
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| 101 | .probe = cpcap_power_button_probe,
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| 102 | .driver = {
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| 103 | .name = "cpcap-pwrbutton",
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| 104 | .of_match_table = of_match_ptr(cpcap_pwrbutton_dt_match_table),
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| 105 | },
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| 106 | };
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| 107 | module_platform_driver(cpcap_power_button_driver);
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| 108 |
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| 109 | MODULE_ALIAS("platform:cpcap-pwrbutton");
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| 110 | MODULE_DESCRIPTION("CPCAP Power Button");
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| 111 | MODULE_LICENSE("GPL");
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| 112 | MODULE_AUTHOR("Sebastian Reichel <[email protected]>");
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