| 1 | |
| 2 | * Retu power button driver.
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| 3 | *
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| 4 | * Copyright (C) 2004-2010 Nokia Corporation
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| 5 | *
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| 6 | * Original code written by Ari Saastamoinen, Juha Yrjölä and Felipe Balbi.
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| 7 | * Rewritten by Aaro Koskinen.
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| 8 | *
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| 9 | * This file is subject to the terms and conditions of the GNU General
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| 10 | * Public License. See the file "COPYING" in the main directory of this
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| 11 | * archive for more details.
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| 12 | *
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| 13 | * This program is distributed in the hope that it will be useful,
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| 14 | * but WITHOUT ANY WARRANTY; without even the implied warranty of
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| 15 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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| 16 | * GNU General Public License for more details.
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| 17 |
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| 18 |
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| 19 | #include <linux/irq.h>
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| 20 | #include <linux/slab.h>
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| 21 | #include <linux/errno.h>
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| 22 | #include <linux/input.h>
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| 23 | #include <linux/kernel.h>
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| 24 | #include <linux/module.h>
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| 25 | #include <linux/mfd/retu.h>
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| 26 | #include <linux/interrupt.h>
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| 27 | #include <linux/platform_device.h>
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| 28 |
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| 29 | #define RETU_STATUS_PWRONX (1 << 5)
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| 30 |
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| 31 | static irqreturn_t retu_pwrbutton_irq(int irq, void *_pwr)
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| 32 | {
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| 33 | struct input_dev *idev = _pwr;
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| 34 | struct retu_dev *rdev = input_get_drvdata(idev);
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| 35 | bool state;
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| 36 |
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| 37 | state = !(retu_read(rdev, RETU_REG_STATUS) & RETU_STATUS_PWRONX);
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| 38 | input_report_key(idev, KEY_POWER, state);
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| 39 | input_sync(idev);
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| 40 |
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| 41 | return IRQ_HANDLED;
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| 42 | }
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| 43 |
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| 44 | static int retu_pwrbutton_probe(struct platform_device *pdev)
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| 45 | {
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| 46 | struct retu_dev *rdev = dev_get_drvdata(pdev->dev.parent);
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| 47 | struct input_dev *idev;
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| 48 | int irq;
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| 49 | int error;
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| 50 |
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| 51 | irq = platform_get_irq(pdev, 0);
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| 52 | if (irq < 0)
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| 53 | return irq;
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| 54 |
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| 55 | idev = devm_input_allocate_device(&pdev->dev);
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| 56 | if (!idev)
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| 57 | return -ENOMEM;
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| 58 |
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| 59 | idev->name = "retu-pwrbutton";
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| 60 | idev->dev.parent = &pdev->dev;
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| 61 |
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| 62 | input_set_capability(idev, EV_KEY, KEY_POWER);
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| 63 | input_set_drvdata(idev, rdev);
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| 64 |
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| 65 | error = devm_request_threaded_irq(&pdev->dev, irq,
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| 66 | NULL, retu_pwrbutton_irq,
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| 67 | IRQF_ONESHOT,
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| 68 | "retu-pwrbutton", idev);
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| 69 | if (error)
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| 70 | return error;
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| 71 |
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| 72 | error = input_register_device(idev);
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| 73 | if (error)
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| 74 | return error;
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| 75 |
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| 76 | return 0;
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| 77 | }
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| 78 |
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| 79 | static struct platform_driver retu_pwrbutton_driver = {
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| 80 | .probe = retu_pwrbutton_probe,
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| 81 | .driver = {
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| 82 | .name = "retu-pwrbutton",
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| 83 | },
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| 84 | };
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| 85 | module_platform_driver(retu_pwrbutton_driver);
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| 86 |
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| 87 | MODULE_ALIAS("platform:retu-pwrbutton");
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| 88 | MODULE_DESCRIPTION("Retu Power Button");
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| 89 | MODULE_AUTHOR("Ari Saastamoinen");
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| 90 | MODULE_AUTHOR("Felipe Balbi");
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| 91 | MODULE_AUTHOR("Aaro Koskinen <[email protected]>");
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| 92 | MODULE_LICENSE("GPL");
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