2f99ffd8d7
Report input event directly on wakeup to ensure no press event is missed when resuming from suspend. Signed-off-by: Jacky Bai <ping.bai@nxp.com> Reviewed-by: Peng Fan <peng.fan@nxp.com> Acked-by: Jason Liu <jason.hui.liu@nxp.com> Signed-off-by: Frank Li <Frank.Li@nxp.com> Link: https://lore.kernel.org/r/20240716000721.3485597-1-Frank.Li@nxp.com Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
232 lines
5.8 KiB
C
232 lines
5.8 KiB
C
// SPDX-License-Identifier: GPL-2.0+
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//
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// Copyright 2022 NXP.
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#include <linux/device.h>
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#include <linux/err.h>
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#include <linux/init.h>
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#include <linux/input.h>
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#include <linux/interrupt.h>
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#include <linux/io.h>
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#include <linux/jiffies.h>
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#include <linux/kernel.h>
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#include <linux/mfd/syscon.h>
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#include <linux/module.h>
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#include <linux/of.h>
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#include <linux/of_address.h>
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#include <linux/platform_device.h>
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#include <linux/pm_wakeirq.h>
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#include <linux/regmap.h>
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#define BBNSM_CTRL 0x8
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#define BBNSM_INT_EN 0x10
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#define BBNSM_EVENTS 0x14
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#define BBNSM_PAD_CTRL 0x24
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#define BBNSM_BTN_PRESSED BIT(7)
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#define BBNSM_PWR_ON BIT(6)
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#define BBNSM_BTN_OFF BIT(5)
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#define BBNSM_EMG_OFF BIT(4)
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#define BBNSM_PWRKEY_EVENTS (BBNSM_PWR_ON | BBNSM_BTN_OFF | BBNSM_EMG_OFF)
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#define BBNSM_DP_EN BIT(24)
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#define DEBOUNCE_TIME 30
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#define REPEAT_INTERVAL 60
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struct bbnsm_pwrkey {
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struct regmap *regmap;
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int irq;
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int keycode;
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int keystate; /* 1:pressed */
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bool suspended;
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struct timer_list check_timer;
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struct input_dev *input;
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};
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static void bbnsm_pwrkey_check_for_events(struct timer_list *t)
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{
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struct bbnsm_pwrkey *bbnsm = from_timer(bbnsm, t, check_timer);
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struct input_dev *input = bbnsm->input;
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u32 state;
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regmap_read(bbnsm->regmap, BBNSM_EVENTS, &state);
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state = state & BBNSM_BTN_PRESSED ? 1 : 0;
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/* only report new event if status changed */
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if (state ^ bbnsm->keystate) {
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bbnsm->keystate = state;
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input_event(input, EV_KEY, bbnsm->keycode, state);
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input_sync(input);
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pm_relax(bbnsm->input->dev.parent);
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}
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/* repeat check if pressed long */
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if (state)
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mod_timer(&bbnsm->check_timer,
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jiffies + msecs_to_jiffies(REPEAT_INTERVAL));
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}
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static irqreturn_t bbnsm_pwrkey_interrupt(int irq, void *dev_id)
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{
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struct platform_device *pdev = dev_id;
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struct bbnsm_pwrkey *bbnsm = platform_get_drvdata(pdev);
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struct input_dev *input = bbnsm->input;
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u32 event;
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regmap_read(bbnsm->regmap, BBNSM_EVENTS, &event);
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if (!(event & BBNSM_BTN_OFF))
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return IRQ_NONE;
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pm_wakeup_event(bbnsm->input->dev.parent, 0);
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/*
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* Directly report key event after resume to make sure key press
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* event is never missed.
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*/
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if (bbnsm->suspended) {
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bbnsm->keystate = 1;
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input_event(input, EV_KEY, bbnsm->keycode, 1);
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input_sync(input);
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/* Fire at most once per suspend/resume cycle */
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bbnsm->suspended = false;
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}
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mod_timer(&bbnsm->check_timer,
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jiffies + msecs_to_jiffies(DEBOUNCE_TIME));
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/* clear PWR OFF */
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regmap_write(bbnsm->regmap, BBNSM_EVENTS, BBNSM_BTN_OFF);
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return IRQ_HANDLED;
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}
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static void bbnsm_pwrkey_act(void *pdata)
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{
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struct bbnsm_pwrkey *bbnsm = pdata;
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timer_shutdown_sync(&bbnsm->check_timer);
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}
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static int bbnsm_pwrkey_probe(struct platform_device *pdev)
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{
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struct bbnsm_pwrkey *bbnsm;
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struct input_dev *input;
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struct device_node *np = pdev->dev.of_node;
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int error;
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bbnsm = devm_kzalloc(&pdev->dev, sizeof(*bbnsm), GFP_KERNEL);
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if (!bbnsm)
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return -ENOMEM;
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bbnsm->regmap = syscon_node_to_regmap(np->parent);
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if (IS_ERR(bbnsm->regmap)) {
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dev_err(&pdev->dev, "bbnsm pwerkey get regmap failed\n");
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return PTR_ERR(bbnsm->regmap);
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}
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if (device_property_read_u32(&pdev->dev, "linux,code",
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&bbnsm->keycode)) {
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bbnsm->keycode = KEY_POWER;
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dev_warn(&pdev->dev, "key code is not specified, using default KEY_POWER\n");
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}
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bbnsm->irq = platform_get_irq(pdev, 0);
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if (bbnsm->irq < 0)
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return -EINVAL;
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/* config the BBNSM power related register */
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regmap_update_bits(bbnsm->regmap, BBNSM_CTRL, BBNSM_DP_EN, BBNSM_DP_EN);
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/* clear the unexpected interrupt before driver ready */
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regmap_write_bits(bbnsm->regmap, BBNSM_EVENTS, BBNSM_PWRKEY_EVENTS,
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BBNSM_PWRKEY_EVENTS);
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timer_setup(&bbnsm->check_timer, bbnsm_pwrkey_check_for_events, 0);
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input = devm_input_allocate_device(&pdev->dev);
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if (!input) {
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dev_err(&pdev->dev, "failed to allocate the input device\n");
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return -ENOMEM;
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}
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input->name = pdev->name;
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input->phys = "bbnsm-pwrkey/input0";
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input->id.bustype = BUS_HOST;
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input_set_capability(input, EV_KEY, bbnsm->keycode);
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/* input customer action to cancel release timer */
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error = devm_add_action(&pdev->dev, bbnsm_pwrkey_act, bbnsm);
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if (error) {
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dev_err(&pdev->dev, "failed to register remove action\n");
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return error;
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}
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bbnsm->input = input;
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platform_set_drvdata(pdev, bbnsm);
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error = devm_request_irq(&pdev->dev, bbnsm->irq, bbnsm_pwrkey_interrupt,
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IRQF_SHARED, pdev->name, pdev);
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if (error) {
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dev_err(&pdev->dev, "interrupt not available.\n");
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return error;
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}
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error = input_register_device(input);
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if (error) {
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dev_err(&pdev->dev, "failed to register input device\n");
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return error;
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}
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device_init_wakeup(&pdev->dev, true);
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error = dev_pm_set_wake_irq(&pdev->dev, bbnsm->irq);
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if (error)
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dev_warn(&pdev->dev, "irq wake enable failed.\n");
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return 0;
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}
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static int __maybe_unused bbnsm_pwrkey_suspend(struct device *dev)
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{
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struct platform_device *pdev = to_platform_device(dev);
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struct bbnsm_pwrkey *bbnsm = platform_get_drvdata(pdev);
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bbnsm->suspended = true;
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return 0;
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}
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static int __maybe_unused bbnsm_pwrkey_resume(struct device *dev)
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{
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struct platform_device *pdev = to_platform_device(dev);
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struct bbnsm_pwrkey *bbnsm = platform_get_drvdata(pdev);
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bbnsm->suspended = false;
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return 0;
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}
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static SIMPLE_DEV_PM_OPS(bbnsm_pwrkey_pm_ops, bbnsm_pwrkey_suspend,
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bbnsm_pwrkey_resume);
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static const struct of_device_id bbnsm_pwrkey_ids[] = {
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{ .compatible = "nxp,imx93-bbnsm-pwrkey" },
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{ /* sentinel */ }
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};
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MODULE_DEVICE_TABLE(of, bbnsm_pwrkey_ids);
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static struct platform_driver bbnsm_pwrkey_driver = {
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.driver = {
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.name = "bbnsm_pwrkey",
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.pm = &bbnsm_pwrkey_pm_ops,
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.of_match_table = bbnsm_pwrkey_ids,
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},
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.probe = bbnsm_pwrkey_probe,
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};
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module_platform_driver(bbnsm_pwrkey_driver);
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MODULE_AUTHOR("Jacky Bai <ping.bai@nxp.com>");
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MODULE_DESCRIPTION("NXP bbnsm power key Driver");
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MODULE_LICENSE("GPL");
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