116 lines
2.8 KiB
C
116 lines
2.8 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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/* NXP PCF50633 Input Driver
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*
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* (C) 2006-2008 by Openmoko, Inc.
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* Author: Balaji Rao <balajirrao@openmoko.org>
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* All rights reserved.
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*
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* Broken down from monstrous PCF50633 driver mainly by
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* Harald Welte, Andy Green and Werner Almesberger
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*/
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/device.h>
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#include <linux/platform_device.h>
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#include <linux/input.h>
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#include <linux/slab.h>
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#include <linux/mfd/pcf50633/core.h>
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#define PCF50633_OOCSTAT_ONKEY 0x01
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#define PCF50633_REG_OOCSTAT 0x12
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#define PCF50633_REG_OOCMODE 0x10
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struct pcf50633_input {
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struct pcf50633 *pcf;
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struct input_dev *input_dev;
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};
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static void
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pcf50633_input_irq(int irq, void *data)
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{
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struct pcf50633_input *input;
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int onkey_released;
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input = data;
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/* We report only one event depending on the key press status */
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onkey_released = pcf50633_reg_read(input->pcf, PCF50633_REG_OOCSTAT)
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& PCF50633_OOCSTAT_ONKEY;
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if (irq == PCF50633_IRQ_ONKEYF && !onkey_released)
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input_report_key(input->input_dev, KEY_POWER, 1);
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else if (irq == PCF50633_IRQ_ONKEYR && onkey_released)
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input_report_key(input->input_dev, KEY_POWER, 0);
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input_sync(input->input_dev);
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}
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static int pcf50633_input_probe(struct platform_device *pdev)
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{
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struct pcf50633_input *input;
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struct input_dev *input_dev;
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int ret;
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input = kzalloc(sizeof(*input), GFP_KERNEL);
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if (!input)
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return -ENOMEM;
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input_dev = input_allocate_device();
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if (!input_dev) {
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kfree(input);
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return -ENOMEM;
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}
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platform_set_drvdata(pdev, input);
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input->pcf = dev_to_pcf50633(pdev->dev.parent);
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input->input_dev = input_dev;
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input_dev->name = "PCF50633 PMU events";
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input_dev->id.bustype = BUS_I2C;
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input_dev->evbit[0] = BIT(EV_KEY) | BIT(EV_PWR);
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set_bit(KEY_POWER, input_dev->keybit);
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ret = input_register_device(input_dev);
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if (ret) {
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input_free_device(input_dev);
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kfree(input);
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return ret;
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}
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pcf50633_register_irq(input->pcf, PCF50633_IRQ_ONKEYR,
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pcf50633_input_irq, input);
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pcf50633_register_irq(input->pcf, PCF50633_IRQ_ONKEYF,
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pcf50633_input_irq, input);
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return 0;
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}
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static int pcf50633_input_remove(struct platform_device *pdev)
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{
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struct pcf50633_input *input = platform_get_drvdata(pdev);
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pcf50633_free_irq(input->pcf, PCF50633_IRQ_ONKEYR);
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pcf50633_free_irq(input->pcf, PCF50633_IRQ_ONKEYF);
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input_unregister_device(input->input_dev);
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kfree(input);
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return 0;
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}
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static struct platform_driver pcf50633_input_driver = {
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.driver = {
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.name = "pcf50633-input",
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},
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.probe = pcf50633_input_probe,
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.remove = pcf50633_input_remove,
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};
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module_platform_driver(pcf50633_input_driver);
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MODULE_AUTHOR("Balaji Rao <balajirrao@openmoko.org>");
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MODULE_DESCRIPTION("PCF50633 input driver");
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MODULE_LICENSE("GPL");
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MODULE_ALIAS("platform:pcf50633-input");
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