input/misc/ab8500-ponkey.c

0001 // SPDX-License-Identifier: GPL-2.0-only
0002 /*
0003  * Copyright (C) ST-Ericsson SA 2010
0004  *
0005  * Author: Sundar Iyer <sundar.iyer@stericsson.com> for ST-Ericsson
0006  *
0007  * AB8500 Power-On Key handler
0008  */
0009
0010 #include <linux/device.h>
0011 #include <linux/kernel.h>
0012 #include <linux/module.h>
0013 #include <linux/platform_device.h>
0014 #include <linux/input.h>
0015 #include <linux/interrupt.h>
0016 #include <linux/mfd/abx500/ab8500.h>
0017 #include <linux/of.h>
0018 #include <linux/slab.h>
0019
0020 /**
0021  * struct ab8500_ponkey - ab8500 ponkey information
0022  * @idev: pointer to input device
0023  * @ab8500: ab8500 parent
0024  * @irq_dbf: irq number for falling transition
0025  * @irq_dbr: irq number for rising transition
0026  */
0027 struct ab8500_ponkey {
0028     struct input_dev    *idev;
0029     struct ab8500       *ab8500;
0030     int         irq_dbf;
0031     int         irq_dbr;
0032 };
0033
0034 /* AB8500 gives us an interrupt when ONKEY is held */
0035 static irqreturn_t ab8500_ponkey_handler(int irq, void *data)
0036 {
0037     struct ab8500_ponkey *ponkey = data;
0038
0039     if (irq == ponkey->irq_dbf)
0040         input_report_key(ponkey->idev, KEY_POWER, true);
0041     else if (irq == ponkey->irq_dbr)
0042         input_report_key(ponkey->idev, KEY_POWER, false);
0043
0044     input_sync(ponkey->idev);
0045
0046     return IRQ_HANDLED;
0047 }
0048
0049 static int ab8500_ponkey_probe(struct platform_device *pdev)
0050 {
0051     struct ab8500 *ab8500 = dev_get_drvdata(pdev->dev.parent);
0052     struct ab8500_ponkey *ponkey;
0053     struct input_dev *input;
0054     int irq_dbf, irq_dbr;
0055     int error;
0056
0057     irq_dbf = platform_get_irq_byname(pdev, "ONKEY_DBF");
0058     if (irq_dbf < 0)
0059         return irq_dbf;
0060
0061     irq_dbr = platform_get_irq_byname(pdev, "ONKEY_DBR");
0062     if (irq_dbr < 0)
0063         return irq_dbr;
0064
0065     ponkey = devm_kzalloc(&pdev->dev, sizeof(struct ab8500_ponkey),
0066                   GFP_KERNEL);
0067     if (!ponkey)
0068         return -ENOMEM;
0069
0070     input = devm_input_allocate_device(&pdev->dev);
0071     if (!input)
0072         return -ENOMEM;
0073
0074     ponkey->idev = input;
0075     ponkey->ab8500 = ab8500;
0076     ponkey->irq_dbf = irq_dbf;
0077     ponkey->irq_dbr = irq_dbr;
0078
0079     input->name = "AB8500 POn(PowerOn) Key";
0080     input->dev.parent = &pdev->dev;
0081
0082     input_set_capability(input, EV_KEY, KEY_POWER);
0083
0084     error = devm_request_any_context_irq(&pdev->dev, ponkey->irq_dbf,
0085                          ab8500_ponkey_handler, 0,
0086                          "ab8500-ponkey-dbf", ponkey);
0087     if (error < 0) {
0088         dev_err(ab8500->dev, "Failed to request dbf IRQ#%d: %d\n",
0089             ponkey->irq_dbf, error);
0090         return error;
0091     }
0092
0093     error = devm_request_any_context_irq(&pdev->dev, ponkey->irq_dbr,
0094                          ab8500_ponkey_handler, 0,
0095                          "ab8500-ponkey-dbr", ponkey);
0096     if (error < 0) {
0097         dev_err(ab8500->dev, "Failed to request dbr IRQ#%d: %d\n",
0098             ponkey->irq_dbr, error);
0099         return error;
0100     }
0101
0102     error = input_register_device(ponkey->idev);
0103     if (error) {
0104         dev_err(ab8500->dev, "Can't register input device: %d\n", error);
0105         return error;
0106     }
0107
0108     return 0;
0109 }
0110
0111 #ifdef CONFIG_OF
0112 static const struct of_device_id ab8500_ponkey_match[] = {
0113     { .compatible = "stericsson,ab8500-ponkey", },
0114     {}
0115 };
0116 MODULE_DEVICE_TABLE(of, ab8500_ponkey_match);
0117 #endif
0118
0119 static struct platform_driver ab8500_ponkey_driver = {
0120     .driver     = {
0121         .name   = "ab8500-poweron-key",
0122         .of_match_table = of_match_ptr(ab8500_ponkey_match),
0123     },
0124     .probe      = ab8500_ponkey_probe,
0125 };
0126 module_platform_driver(ab8500_ponkey_driver);
0127
0128 MODULE_LICENSE("GPL v2");
0129 MODULE_AUTHOR("Sundar Iyer <sundar.iyer@stericsson.com>");
0130 MODULE_DESCRIPTION("ST-Ericsson AB8500 Power-ON(Pon) Key driver");