Aaro Koskinen | 544a46c | 2012-11-10 00:50:25 -0800 | [diff] [blame] | 1 | /* |
| 2 | * Retu power button driver. |
| 3 | * |
| 4 | * Copyright (C) 2004-2010 Nokia Corporation |
| 5 | * |
| 6 | * Original code written by Ari Saastamoinen, Juha Yrjölä and Felipe Balbi. |
| 7 | * Rewritten by Aaro Koskinen. |
| 8 | * |
| 9 | * This file is subject to the terms and conditions of the GNU General |
| 10 | * Public License. See the file "COPYING" in the main directory of this |
| 11 | * archive for more details. |
| 12 | * |
| 13 | * This program is distributed in the hope that it will be useful, |
| 14 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 15 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 16 | * GNU General Public License for more details. |
| 17 | */ |
| 18 | |
| 19 | #include <linux/irq.h> |
| 20 | #include <linux/init.h> |
| 21 | #include <linux/slab.h> |
| 22 | #include <linux/errno.h> |
| 23 | #include <linux/input.h> |
| 24 | #include <linux/kernel.h> |
| 25 | #include <linux/module.h> |
| 26 | #include <linux/mfd/retu.h> |
| 27 | #include <linux/interrupt.h> |
| 28 | #include <linux/platform_device.h> |
| 29 | |
| 30 | #define RETU_STATUS_PWRONX (1 << 5) |
| 31 | |
| 32 | static irqreturn_t retu_pwrbutton_irq(int irq, void *_pwr) |
| 33 | { |
| 34 | struct input_dev *idev = _pwr; |
| 35 | struct retu_dev *rdev = input_get_drvdata(idev); |
| 36 | bool state; |
| 37 | |
| 38 | state = !(retu_read(rdev, RETU_REG_STATUS) & RETU_STATUS_PWRONX); |
| 39 | input_report_key(idev, KEY_POWER, state); |
| 40 | input_sync(idev); |
| 41 | |
| 42 | return IRQ_HANDLED; |
| 43 | } |
| 44 | |
| 45 | static int __devinit retu_pwrbutton_probe(struct platform_device *pdev) |
| 46 | { |
| 47 | struct retu_dev *rdev = dev_get_drvdata(pdev->dev.parent); |
| 48 | struct input_dev *idev; |
| 49 | int irq; |
| 50 | int error; |
| 51 | |
| 52 | irq = platform_get_irq(pdev, 0); |
| 53 | if (irq < 0) |
| 54 | return irq; |
| 55 | |
| 56 | idev = devm_input_allocate_device(&pdev->dev); |
| 57 | if (!idev) |
| 58 | return -ENOMEM; |
| 59 | |
| 60 | idev->name = "retu-pwrbutton"; |
| 61 | idev->dev.parent = &pdev->dev; |
| 62 | |
| 63 | input_set_capability(idev, EV_KEY, KEY_POWER); |
| 64 | input_set_drvdata(idev, rdev); |
| 65 | |
| 66 | error = devm_request_threaded_irq(&pdev->dev, irq, |
| 67 | NULL, retu_pwrbutton_irq, 0, |
| 68 | "retu-pwrbutton", idev); |
| 69 | if (error) |
| 70 | return error; |
| 71 | |
| 72 | error = input_register_device(idev); |
| 73 | if (error) |
| 74 | return error; |
| 75 | |
| 76 | return 0; |
| 77 | } |
| 78 | |
| 79 | static int __devexit retu_pwrbutton_remove(struct platform_device *pdev) |
| 80 | { |
| 81 | return 0; |
| 82 | } |
| 83 | |
| 84 | static struct platform_driver retu_pwrbutton_driver = { |
| 85 | .probe = retu_pwrbutton_probe, |
| 86 | .remove = __devexit_p(retu_pwrbutton_remove), |
| 87 | .driver = { |
| 88 | .name = "retu-pwrbutton", |
| 89 | .owner = THIS_MODULE, |
| 90 | }, |
| 91 | }; |
| 92 | module_platform_driver(retu_pwrbutton_driver); |
| 93 | |
| 94 | MODULE_ALIAS("platform:retu-pwrbutton"); |
| 95 | MODULE_DESCRIPTION("Retu Power Button"); |
| 96 | MODULE_AUTHOR("Ari Saastamoinen"); |
| 97 | MODULE_AUTHOR("Felipe Balbi"); |
| 98 | MODULE_AUTHOR("Aaro Koskinen <aaro.koskinen@iki.fi>"); |
| 99 | MODULE_LICENSE("GPL"); |