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![Anson Huang](/assets/img/avatar_default.png)
Use devm_add_action_or_reset() to handle all cleanups of failure in .probe and .remove, then .remove callback can be dropped. Signed-off-by: Anson Huang <Anson.Huang@nxp.com> Link: https://lore.kernel.org/r/1584082751-17047-1-git-send-email-Anson.Huang@nxp.com Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
190 lines
4.6 KiB
C
190 lines
4.6 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* Copyright 2019 NXP.
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*/
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#include <linux/err.h>
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#include <linux/device.h>
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#include <linux/firmware/imx/sci.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/jiffies.h>
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/of.h>
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#include <linux/platform_device.h>
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#include <linux/property.h>
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#define DEBOUNCE_TIME 30
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#define REPEAT_INTERVAL 60
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#define SC_IRQ_BUTTON 1
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#define SC_IRQ_GROUP_WAKE 3
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#define IMX_SC_MISC_FUNC_GET_BUTTON_STATUS 18
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struct imx_key_drv_data {
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u32 keycode;
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bool keystate; /* true: pressed, false: released */
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struct delayed_work check_work;
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struct input_dev *input;
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struct imx_sc_ipc *key_ipc_handle;
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struct notifier_block key_notifier;
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};
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struct imx_sc_msg_key {
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struct imx_sc_rpc_msg hdr;
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u32 state;
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};
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static int imx_sc_key_notify(struct notifier_block *nb,
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unsigned long event, void *group)
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{
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struct imx_key_drv_data *priv =
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container_of(nb,
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struct imx_key_drv_data,
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key_notifier);
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if ((event & SC_IRQ_BUTTON) && (*(u8 *)group == SC_IRQ_GROUP_WAKE)) {
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schedule_delayed_work(&priv->check_work,
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msecs_to_jiffies(DEBOUNCE_TIME));
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pm_wakeup_event(priv->input->dev.parent, 0);
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}
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return 0;
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}
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static void imx_sc_check_for_events(struct work_struct *work)
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{
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struct imx_key_drv_data *priv =
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container_of(work,
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struct imx_key_drv_data,
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check_work.work);
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struct input_dev *input = priv->input;
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struct imx_sc_msg_key msg;
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struct imx_sc_rpc_msg *hdr = &msg.hdr;
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bool state;
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int error;
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hdr->ver = IMX_SC_RPC_VERSION;
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hdr->svc = IMX_SC_RPC_SVC_MISC;
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hdr->func = IMX_SC_MISC_FUNC_GET_BUTTON_STATUS;
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hdr->size = 1;
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error = imx_scu_call_rpc(priv->key_ipc_handle, &msg, true);
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if (error) {
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dev_err(&input->dev, "read imx sc key failed, error %d\n", error);
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return;
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}
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/*
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* The response data from SCU firmware is 4 bytes,
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* but ONLY the first byte is the key state, other
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* 3 bytes could be some dirty data, so we should
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* ONLY take the first byte as key state.
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*/
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state = (bool)(msg.state & 0xff);
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if (state ^ priv->keystate) {
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priv->keystate = state;
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input_event(input, EV_KEY, priv->keycode, state);
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input_sync(input);
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if (!priv->keystate)
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pm_relax(priv->input->dev.parent);
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}
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if (state)
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schedule_delayed_work(&priv->check_work,
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msecs_to_jiffies(REPEAT_INTERVAL));
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}
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static void imx_sc_key_action(void *data)
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{
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struct imx_key_drv_data *priv = data;
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imx_scu_irq_group_enable(SC_IRQ_GROUP_WAKE, SC_IRQ_BUTTON, false);
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imx_scu_irq_unregister_notifier(&priv->key_notifier);
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cancel_delayed_work_sync(&priv->check_work);
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}
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static int imx_sc_key_probe(struct platform_device *pdev)
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{
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struct imx_key_drv_data *priv;
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struct input_dev *input;
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int error;
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priv = devm_kzalloc(&pdev->dev, sizeof(*priv), GFP_KERNEL);
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if (!priv)
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return -ENOMEM;
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error = imx_scu_get_handle(&priv->key_ipc_handle);
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if (error)
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return error;
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if (device_property_read_u32(&pdev->dev, "linux,keycodes",
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&priv->keycode)) {
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dev_err(&pdev->dev, "missing linux,keycodes property\n");
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return -EINVAL;
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}
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INIT_DELAYED_WORK(&priv->check_work, imx_sc_check_for_events);
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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 = "imx-sc-key/input0";
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input->id.bustype = BUS_HOST;
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input_set_capability(input, EV_KEY, priv->keycode);
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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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priv->input = input;
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platform_set_drvdata(pdev, priv);
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error = imx_scu_irq_group_enable(SC_IRQ_GROUP_WAKE, SC_IRQ_BUTTON,
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true);
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if (error) {
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dev_err(&pdev->dev, "failed to enable scu group irq\n");
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return error;
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}
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error = devm_add_action_or_reset(&pdev->dev, imx_sc_key_action, &priv);
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if (error)
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return error;
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priv->key_notifier.notifier_call = imx_sc_key_notify;
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error = imx_scu_irq_register_notifier(&priv->key_notifier);
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if (error)
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dev_err(&pdev->dev, "failed to register scu notifier\n");
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return error;
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}
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static const struct of_device_id imx_sc_key_ids[] = {
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{ .compatible = "fsl,imx-sc-key" },
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{ /* sentinel */ }
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};
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MODULE_DEVICE_TABLE(of, imx_sc_key_ids);
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static struct platform_driver imx_sc_key_driver = {
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.driver = {
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.name = "imx-sc-key",
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.of_match_table = imx_sc_key_ids,
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},
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.probe = imx_sc_key_probe,
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};
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module_platform_driver(imx_sc_key_driver);
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MODULE_AUTHOR("Anson Huang <Anson.Huang@nxp.com>");
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MODULE_DESCRIPTION("i.MX System Controller Key Driver");
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MODULE_LICENSE("GPL v2");
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