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https://git.kernel.org/pub/scm/linux/kernel/git/chenhuacai/linux-loongson
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bb7e361191
The MCU controls the power-button and beeper, so expose them as input device. There is of course no interrupt line, so the status of the power-button needs to be polled. To generate an event the power-button also needs to be held for 1-2 seconds, so the polling interval does not need to be overly fast. Signed-off-by: Heiko Stuebner <heiko@sntech.de> Acked-by: Dmitry Torokhov <dmitry.torokhov@gmail.com> Link: https://lore.kernel.org/r/20241107114712.538976-7-heiko@sntech.de Signed-off-by: Lee Jones <lee@kernel.org>
154 lines
3.7 KiB
C
154 lines
3.7 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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* Driver for input events on QNAP-MCUs
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*
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* Copyright (C) 2024 Heiko Stuebner <heiko@sntech.de>
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*/
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#include <linux/input.h>
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#include <linux/mfd/qnap-mcu.h>
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#include <linux/module.h>
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#include <linux/platform_device.h>
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#include <linux/slab.h>
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#include <uapi/linux/input-event-codes.h>
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/*
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* The power-key needs to be pressed for a while to create an event,
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* so there is no use for overly frequent polling.
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*/
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#define POLL_INTERVAL 500
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struct qnap_mcu_input_dev {
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struct input_dev *input;
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struct qnap_mcu *mcu;
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struct device *dev;
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struct work_struct beep_work;
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int beep_type;
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};
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static void qnap_mcu_input_poll(struct input_dev *input)
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{
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struct qnap_mcu_input_dev *idev = input_get_drvdata(input);
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static const u8 cmd[] = { '@', 'C', 'V' };
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u8 reply[4];
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int state, ret;
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/* poll the power button */
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ret = qnap_mcu_exec(idev->mcu, cmd, sizeof(cmd), reply, sizeof(reply));
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if (ret)
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return;
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/* First bytes must mirror the sent command */
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if (memcmp(cmd, reply, sizeof(cmd))) {
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dev_err(idev->dev, "malformed data received\n");
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return;
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}
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state = reply[3] - 0x30;
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input_event(input, EV_KEY, KEY_POWER, state);
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input_sync(input);
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}
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static void qnap_mcu_input_beeper_work(struct work_struct *work)
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{
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struct qnap_mcu_input_dev *idev =
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container_of(work, struct qnap_mcu_input_dev, beep_work);
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const u8 cmd[] = { '@', 'C', (idev->beep_type == SND_TONE) ? '3' : '2' };
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qnap_mcu_exec_with_ack(idev->mcu, cmd, sizeof(cmd));
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}
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static int qnap_mcu_input_event(struct input_dev *input, unsigned int type,
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unsigned int code, int value)
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{
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struct qnap_mcu_input_dev *idev = input_get_drvdata(input);
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if (type != EV_SND || (code != SND_BELL && code != SND_TONE))
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return -EOPNOTSUPP;
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if (value < 0)
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return -EINVAL;
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/* beep runtime is determined by the MCU */
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if (value == 0)
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return 0;
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/* Schedule work to actually turn the beeper on */
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idev->beep_type = code;
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schedule_work(&idev->beep_work);
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return 0;
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}
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static void qnap_mcu_input_close(struct input_dev *input)
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{
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struct qnap_mcu_input_dev *idev = input_get_drvdata(input);
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cancel_work_sync(&idev->beep_work);
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}
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static int qnap_mcu_input_probe(struct platform_device *pdev)
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{
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struct qnap_mcu *mcu = dev_get_drvdata(pdev->dev.parent);
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struct qnap_mcu_input_dev *idev;
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struct device *dev = &pdev->dev;
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struct input_dev *input;
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int ret;
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idev = devm_kzalloc(dev, sizeof(*idev), GFP_KERNEL);
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if (!idev)
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return -ENOMEM;
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input = devm_input_allocate_device(dev);
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if (!input)
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return dev_err_probe(dev, -ENOMEM, "no memory for input device\n");
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idev->input = input;
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idev->dev = dev;
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idev->mcu = mcu;
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input_set_drvdata(input, idev);
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input->name = "qnap-mcu";
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input->phys = "qnap-mcu-input/input0";
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input->id.bustype = BUS_HOST;
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input->id.vendor = 0x0001;
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input->id.product = 0x0001;
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input->id.version = 0x0100;
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input->event = qnap_mcu_input_event;
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input->close = qnap_mcu_input_close;
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input_set_capability(input, EV_KEY, KEY_POWER);
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input_set_capability(input, EV_SND, SND_BELL);
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input_set_capability(input, EV_SND, SND_TONE);
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INIT_WORK(&idev->beep_work, qnap_mcu_input_beeper_work);
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ret = input_setup_polling(input, qnap_mcu_input_poll);
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if (ret)
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return dev_err_probe(dev, ret, "unable to set up polling\n");
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input_set_poll_interval(input, POLL_INTERVAL);
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ret = input_register_device(input);
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if (ret)
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return dev_err_probe(dev, ret, "unable to register input device\n");
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return 0;
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}
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static struct platform_driver qnap_mcu_input_driver = {
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.probe = qnap_mcu_input_probe,
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.driver = {
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.name = "qnap-mcu-input",
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},
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};
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module_platform_driver(qnap_mcu_input_driver);
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MODULE_ALIAS("platform:qnap-mcu-input");
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MODULE_AUTHOR("Heiko Stuebner <heiko@sntech.de>");
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MODULE_DESCRIPTION("QNAP MCU input driver");
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MODULE_LICENSE("GPL");
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