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