MLK-16765-4 input: keyboard: imx_sc_pwrkey: add powerkey driver on i.mx8QM/QXP

This powerkey driver is a virtual driver based on scfw which control
SNVS ON/OFF in SCU side. The key interrupt triggered by MU notfication

BuildInfo:
   - SCFW e7d95e1e, IMX-MKIMAGE 05d3d4a7, ATF 93dd1cc
   - U-Boot 2017.03-00684-g28c5243

Signed-off-by: Robin Gong <yibin.gong@nxp.com>
Reviewed-by: Peng Fan <peng.fan@nxp.com>
Reviewed-by: Anson Huang <Anson.Huang@nxp.com>

3 files changed, 181 insertions, 0 deletions

diff --git a/drivers/input/keyboard/Kconfig b/drivers/input/keyboard/Kconfig
index 6a0f3ebdf5f1..ec9c93fc9d7e 100644
--- a/drivers/input/keyboard/Kconfig
+++ b/drivers/input/keyboard/Kconfig
@@ -436,6 +436,13 @@ config KEYBOARD_SNVS_PWRKEY
 	  To compile this driver as a module, choose M here; the
 	  module will be called snvs_pwrkey.
 
+config KEYBOARD_IMX_SC_PWRKEY
+	tristate "IMX SC Power Key Driver"
+	depends on (ARCH_FSL_IMX8QM || ARCH_FSL_IMX8QXP)
+	help
+	  This is the virtual snvs powerkey driver for NXP i.mx8Q/QXP family
+	  whose SCU hold snvs inside.
+
 config KEYBOARD_PF1550_ONKEY
 	tristate "PF1550 OnKey Driver"
 	depends on MFD_PF1550
diff --git a/drivers/input/keyboard/Makefile b/drivers/input/keyboard/Makefile
index 0a613ac5b21f..1448be5c6b33 100644
--- a/drivers/input/keyboard/Makefile
+++ b/drivers/input/keyboard/Makefile
@@ -54,6 +54,7 @@ obj-$(CONFIG_KEYBOARD_RPMSG)		+= rpmsg-keys.o
 obj-$(CONFIG_KEYBOARD_SAMSUNG)		+= samsung-keypad.o
 obj-$(CONFIG_KEYBOARD_SH_KEYSC)		+= sh_keysc.o
 obj-$(CONFIG_KEYBOARD_SNVS_PWRKEY)	+= snvs_pwrkey.o
+obj-$(CONFIG_KEYBOARD_IMX_SC_PWRKEY)	+= imx_sc_pwrkey.o
 obj-$(CONFIG_KEYBOARD_PF1550_ONKEY)	+= pf1550_onkey.o
 obj-$(CONFIG_KEYBOARD_SPEAR)		+= spear-keyboard.o
 obj-$(CONFIG_KEYBOARD_STMPE)		+= stmpe-keypad.o
diff --git a/drivers/input/keyboard/imx_sc_pwrkey.c b/drivers/input/keyboard/imx_sc_pwrkey.c
new file mode 100644
index 000000000000..10c0d06884a9
--- /dev/null
+++ b/drivers/input/keyboard/imx_sc_pwrkey.c
@@ -0,0 +1,173 @@
+/*
+ * Driver for the IMX SNVS ON/OFF Power Key over sc api
+ * Copyright (C) 2017 NXP. All Rights Reserved.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version 2
+ * of the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ */
+
+#include <linux/device.h>
+#include <linux/err.h>
+#include <linux/init.h>
+#include <linux/input.h>
+#include <linux/interrupt.h>
+#include <linux/io.h>
+#include <linux/jiffies.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/of.h>
+#include <linux/of_address.h>
+#include <linux/platform_device.h>
+#include <soc/imx8/sc/sci.h>
+#include <soc/imx8/sc/svc/irq/api.h>
+
+#define DEBOUNCE_TIME	100
+#define REPEAT_INTERVAL	60
+
+struct pwrkey_drv_data {
+	int keycode;
+	bool keystate;  /* 1: pressed, 0: release */
+	bool delay_check;
+	sc_ipc_t ipcHandle;
+	int wakeup;
+	struct delayed_work check_work;
+	struct input_dev *input;
+};
+
+static struct pwrkey_drv_data *pdata;
+
+static int imx_sc_pwrkey_notify(struct notifier_block *nb,
+				      unsigned long event, void *group)
+{
+	/* ignore other irqs */
+	if (!(pdata && pdata->ipcHandle && (event & SC_IRQ_BUTTON) &&
+		(*(sc_irq_group_t *)group == SC_IRQ_GROUP_WAKE)))
+		return 0;
+
+	if (!pdata->delay_check) {
+		pdata->delay_check = 1;
+		schedule_delayed_work(&pdata->check_work,
+					msecs_to_jiffies(REPEAT_INTERVAL));
+	}
+
+	return 0;
+}
+
+static void imx_sc_check_for_events(struct work_struct *work)
+{
+	struct input_dev *input = pdata->input;
+	bool state;
+
+	sc_misc_get_button_status(pdata->ipcHandle, &state);
+	/*
+	 * restore status back if press interrupt received but pin's status
+	 * released, which caused by pressing so quickly.
+	 */
+	if (!state && !pdata->keystate)
+		state = true;
+
+	if (state ^ pdata->keystate) {
+		pm_wakeup_event(input->dev.parent, 0);
+		pdata->keystate = !!state;
+		input_event(input, EV_KEY, pdata->keycode, !!state);
+		input_sync(input);
+		if (!state)
+			pdata->delay_check = 0;
+		pm_relax(pdata->input->dev.parent);
+	}
+	/* repeat check if pressed long */
+	if (state)
+		schedule_delayed_work(&pdata->check_work,
+					msecs_to_jiffies(DEBOUNCE_TIME));
+}
+
+static struct notifier_block imx_sc_pwrkey_notifier = {
+	.notifier_call = imx_sc_pwrkey_notify,
+};
+
+static int imx_sc_pwrkey_probe(struct platform_device *pdev)
+{
+	struct input_dev *input = NULL;
+	struct device_node *np = pdev->dev.of_node;
+	int error;
+	uint32_t mu_id;
+	sc_err_t sciErr;
+
+	pdata = devm_kzalloc(&pdev->dev, sizeof(*pdata), GFP_KERNEL);
+	if (!pdata)
+		return -ENOMEM;
+
+	if (of_property_read_u32(np, "linux,keycode", &pdata->keycode)) {
+		pdata->keycode = KEY_POWER;
+		dev_warn(&pdev->dev, "KEY_POWER without setting in dts\n");
+	}
+
+	sciErr = sc_ipc_getMuID(&mu_id);
+	if (sciErr != SC_ERR_NONE) {
+		dev_err(&pdev->dev, "can not obtain mu id: %d\n", sciErr);
+		return sciErr;
+	}
+
+	sciErr = sc_ipc_open(&pdata->ipcHandle, mu_id);
+
+	if (sciErr != SC_ERR_NONE) {
+		dev_err(&pdev->dev, "can not get ipc handler: %d\n", sciErr);
+		return sciErr;
+	};
+
+	INIT_DELAYED_WORK(&pdata->check_work, imx_sc_check_for_events);
+
+	pdata->wakeup = of_property_read_bool(np, "wakeup-source");
+
+	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-pwrkey/input0";
+	input->id.bustype = BUS_HOST;
+
+	input_set_capability(input, EV_KEY, pdata->keycode);
+
+	error = input_register_device(input);
+	if (error < 0) {
+		dev_err(&pdev->dev, "failed to register input device\n");
+		return error;
+	}
+
+	pdata->input = input;
+	platform_set_drvdata(pdev, pdata);
+
+	device_init_wakeup(&pdev->dev, !!(pdata->wakeup));
+
+	return register_scu_notifier(&imx_sc_pwrkey_notifier);
+}
+
+static const struct of_device_id imx_sc_pwrkey_ids[] = {
+	{ .compatible = "fsl,imx8-pwrkey" },
+	{ /* sentinel */ }
+};
+MODULE_DEVICE_TABLE(of, imx_sc_pwrkey_ids);
+
+static struct platform_driver imx_sc_pwrkey_driver = {
+	.driver = {
+		.name = "imx8-pwrkey",
+		.of_match_table = imx_sc_pwrkey_ids,
+	},
+	.probe = imx_sc_pwrkey_probe,
+};
+module_platform_driver(imx_sc_pwrkey_driver);
+
+MODULE_AUTHOR("Robin Gong <yibin.gong@nxp.com>");
+MODULE_DESCRIPTION("i.MX8 power key driver based on scu");
+MODULE_LICENSE("GPL");