diff options
Diffstat (limited to 'drivers/input/misc/ab8500-ponkey.c')
| -rw-r--r-- | drivers/input/misc/ab8500-ponkey.c | 130 |
1 files changed, 130 insertions, 0 deletions
diff --git a/drivers/input/misc/ab8500-ponkey.c b/drivers/input/misc/ab8500-ponkey.c new file mode 100644 index 000000000..ea3b8292a --- /dev/null +++ b/drivers/input/misc/ab8500-ponkey.c @@ -0,0 +1,130 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * Copyright (C) ST-Ericsson SA 2010 + * + * Author: Sundar Iyer <sundar.iyer@stericsson.com> for ST-Ericsson + * + * AB8500 Power-On Key handler + */ + +#include <linux/device.h> +#include <linux/kernel.h> +#include <linux/module.h> +#include <linux/platform_device.h> +#include <linux/input.h> +#include <linux/interrupt.h> +#include <linux/mfd/abx500/ab8500.h> +#include <linux/of.h> +#include <linux/slab.h> + +/** + * struct ab8500_ponkey - ab8500 ponkey information + * @input_dev: pointer to input device + * @ab8500: ab8500 parent + * @irq_dbf: irq number for falling transition + * @irq_dbr: irq number for rising transition + */ +struct ab8500_ponkey { + struct input_dev *idev; + struct ab8500 *ab8500; + int irq_dbf; + int irq_dbr; +}; + +/* AB8500 gives us an interrupt when ONKEY is held */ +static irqreturn_t ab8500_ponkey_handler(int irq, void *data) +{ + struct ab8500_ponkey *ponkey = data; + + if (irq == ponkey->irq_dbf) + input_report_key(ponkey->idev, KEY_POWER, true); + else if (irq == ponkey->irq_dbr) + input_report_key(ponkey->idev, KEY_POWER, false); + + input_sync(ponkey->idev); + + return IRQ_HANDLED; +} + +static int ab8500_ponkey_probe(struct platform_device *pdev) +{ + struct ab8500 *ab8500 = dev_get_drvdata(pdev->dev.parent); + struct ab8500_ponkey *ponkey; + struct input_dev *input; + int irq_dbf, irq_dbr; + int error; + + irq_dbf = platform_get_irq_byname(pdev, "ONKEY_DBF"); + if (irq_dbf < 0) + return irq_dbf; + + irq_dbr = platform_get_irq_byname(pdev, "ONKEY_DBR"); + if (irq_dbr < 0) + return irq_dbr; + + ponkey = devm_kzalloc(&pdev->dev, sizeof(struct ab8500_ponkey), + GFP_KERNEL); + if (!ponkey) + return -ENOMEM; + + input = devm_input_allocate_device(&pdev->dev); + if (!input) + return -ENOMEM; + + ponkey->idev = input; + ponkey->ab8500 = ab8500; + ponkey->irq_dbf = irq_dbf; + ponkey->irq_dbr = irq_dbr; + + input->name = "AB8500 POn(PowerOn) Key"; + input->dev.parent = &pdev->dev; + + input_set_capability(input, EV_KEY, KEY_POWER); + + error = devm_request_any_context_irq(&pdev->dev, ponkey->irq_dbf, + ab8500_ponkey_handler, 0, + "ab8500-ponkey-dbf", ponkey); + if (error < 0) { + dev_err(ab8500->dev, "Failed to request dbf IRQ#%d: %d\n", + ponkey->irq_dbf, error); + return error; + } + + error = devm_request_any_context_irq(&pdev->dev, ponkey->irq_dbr, + ab8500_ponkey_handler, 0, + "ab8500-ponkey-dbr", ponkey); + if (error < 0) { + dev_err(ab8500->dev, "Failed to request dbr IRQ#%d: %d\n", + ponkey->irq_dbr, error); + return error; + } + + error = input_register_device(ponkey->idev); + if (error) { + dev_err(ab8500->dev, "Can't register input device: %d\n", error); + return error; + } + + return 0; +} + +#ifdef CONFIG_OF +static const struct of_device_id ab8500_ponkey_match[] = { + { .compatible = "stericsson,ab8500-ponkey", }, + {} +}; +MODULE_DEVICE_TABLE(of, ab8500_ponkey_match); +#endif + +static struct platform_driver ab8500_ponkey_driver = { + .driver = { + .name = "ab8500-poweron-key", + .of_match_table = of_match_ptr(ab8500_ponkey_match), + }, + .probe = ab8500_ponkey_probe, +}; +module_platform_driver(ab8500_ponkey_driver); + +MODULE_LICENSE("GPL v2"); +MODULE_AUTHOR("Sundar Iyer <sundar.iyer@stericsson.com>"); +MODULE_DESCRIPTION("ST-Ericsson AB8500 Power-ON(Pon) Key driver"); |