Adding upstream version 6.6.15.upstream/6.6.15

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 244 insertions, 0 deletions

diff --git a/drivers/input/keyboard/snvs_pwrkey.c b/drivers/input/keyboard/snvs_pwrkey.c
new file mode 100644
index 0000000000..ad8660be01
--- /dev/null
+++ b/drivers/input/keyboard/snvs_pwrkey.c
@@ -0,0 +1,244 @@
+// SPDX-License-Identifier: GPL-2.0+
+//
+// Driver for the IMX SNVS ON/OFF Power Key
+// Copyright (C) 2015 Freescale Semiconductor, Inc. All Rights Reserved.
+
+#include <linux/clk.h>
+#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 <linux/pm_wakeirq.h>
+#include <linux/mfd/syscon.h>
+#include <linux/regmap.h>
+
+#define SNVS_HPVIDR1_REG	0xBF8
+#define SNVS_LPSR_REG		0x4C	/* LP Status Register */
+#define SNVS_LPCR_REG		0x38	/* LP Control Register */
+#define SNVS_HPSR_REG		0x14
+#define SNVS_HPSR_BTN		BIT(6)
+#define SNVS_LPSR_SPO		BIT(18)
+#define SNVS_LPCR_DEP_EN	BIT(5)
+
+#define DEBOUNCE_TIME		30
+#define REPEAT_INTERVAL		60
+
+struct pwrkey_drv_data {
+	struct regmap *snvs;
+	int irq;
+	int keycode;
+	int keystate;  /* 1:pressed */
+	int wakeup;
+	struct timer_list check_timer;
+	struct input_dev *input;
+	u8 minor_rev;
+};
+
+static void imx_imx_snvs_check_for_events(struct timer_list *t)
+{
+	struct pwrkey_drv_data *pdata = from_timer(pdata, t, check_timer);
+	struct input_dev *input = pdata->input;
+	u32 state;
+
+	regmap_read(pdata->snvs, SNVS_HPSR_REG, &state);
+	state = state & SNVS_HPSR_BTN ? 1 : 0;
+
+	/* only report new event if status changed */
+	if (state ^ pdata->keystate) {
+		pdata->keystate = state;
+		input_event(input, EV_KEY, pdata->keycode, state);
+		input_sync(input);
+		pm_relax(pdata->input->dev.parent);
+	}
+
+	/* repeat check if pressed long */
+	if (state) {
+		mod_timer(&pdata->check_timer,
+			  jiffies + msecs_to_jiffies(REPEAT_INTERVAL));
+	}
+}
+
+static irqreturn_t imx_snvs_pwrkey_interrupt(int irq, void *dev_id)
+{
+	struct platform_device *pdev = dev_id;
+	struct pwrkey_drv_data *pdata = platform_get_drvdata(pdev);
+	struct input_dev *input = pdata->input;
+	u32 lp_status;
+
+	pm_wakeup_event(input->dev.parent, 0);
+
+	regmap_read(pdata->snvs, SNVS_LPSR_REG, &lp_status);
+	if (lp_status & SNVS_LPSR_SPO) {
+		if (pdata->minor_rev == 0) {
+			/*
+			 * The first generation i.MX6 SoCs only sends an
+			 * interrupt on button release. To mimic power-key
+			 * usage, we'll prepend a press event.
+			 */
+			input_report_key(input, pdata->keycode, 1);
+			input_sync(input);
+			input_report_key(input, pdata->keycode, 0);
+			input_sync(input);
+			pm_relax(input->dev.parent);
+		} else {
+			mod_timer(&pdata->check_timer,
+			          jiffies + msecs_to_jiffies(DEBOUNCE_TIME));
+		}
+	}
+
+	/* clear SPO status */
+	regmap_write(pdata->snvs, SNVS_LPSR_REG, SNVS_LPSR_SPO);
+
+	return IRQ_HANDLED;
+}
+
+static void imx_snvs_pwrkey_disable_clk(void *data)
+{
+	clk_disable_unprepare(data);
+}
+
+static void imx_snvs_pwrkey_act(void *pdata)
+{
+	struct pwrkey_drv_data *pd = pdata;
+
+	del_timer_sync(&pd->check_timer);
+}
+
+static int imx_snvs_pwrkey_probe(struct platform_device *pdev)
+{
+	struct pwrkey_drv_data *pdata;
+	struct input_dev *input;
+	struct device_node *np;
+	struct clk *clk;
+	int error;
+	u32 vid;
+
+	/* Get SNVS register Page */
+	np = pdev->dev.of_node;
+	if (!np)
+		return -ENODEV;
+
+	pdata = devm_kzalloc(&pdev->dev, sizeof(*pdata), GFP_KERNEL);
+	if (!pdata)
+		return -ENOMEM;
+
+	pdata->snvs = syscon_regmap_lookup_by_phandle(np, "regmap");
+	if (IS_ERR(pdata->snvs)) {
+		dev_err(&pdev->dev, "Can't get snvs syscon\n");
+		return PTR_ERR(pdata->snvs);
+	}
+
+	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");
+	}
+
+	clk = devm_clk_get_optional(&pdev->dev, NULL);
+	if (IS_ERR(clk)) {
+		dev_err(&pdev->dev, "Failed to get snvs clock (%pe)\n", clk);
+		return PTR_ERR(clk);
+	}
+
+	error = clk_prepare_enable(clk);
+	if (error) {
+		dev_err(&pdev->dev, "Failed to enable snvs clock (%pe)\n",
+			ERR_PTR(error));
+		return error;
+	}
+
+	error = devm_add_action_or_reset(&pdev->dev,
+					 imx_snvs_pwrkey_disable_clk, clk);
+	if (error) {
+		dev_err(&pdev->dev,
+			"Failed to register clock cleanup handler (%pe)\n",
+			ERR_PTR(error));
+		return error;
+	}
+
+	pdata->wakeup = of_property_read_bool(np, "wakeup-source");
+
+	pdata->irq = platform_get_irq(pdev, 0);
+	if (pdata->irq < 0)
+		return -EINVAL;
+
+	regmap_read(pdata->snvs, SNVS_HPVIDR1_REG, &vid);
+	pdata->minor_rev = vid & 0xff;
+
+	regmap_update_bits(pdata->snvs, SNVS_LPCR_REG, SNVS_LPCR_DEP_EN, SNVS_LPCR_DEP_EN);
+
+	/* clear the unexpected interrupt before driver ready */
+	regmap_write(pdata->snvs, SNVS_LPSR_REG, SNVS_LPSR_SPO);
+
+	timer_setup(&pdata->check_timer, imx_imx_snvs_check_for_events, 0);
+
+	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 = "snvs-pwrkey/input0";
+	input->id.bustype = BUS_HOST;
+
+	input_set_capability(input, EV_KEY, pdata->keycode);
+
+	/* input customer action to cancel release timer */
+	error = devm_add_action(&pdev->dev, imx_snvs_pwrkey_act, pdata);
+	if (error) {
+		dev_err(&pdev->dev, "failed to register remove action\n");
+		return error;
+	}
+
+	pdata->input = input;
+	platform_set_drvdata(pdev, pdata);
+
+	error = devm_request_irq(&pdev->dev, pdata->irq,
+			       imx_snvs_pwrkey_interrupt,
+			       0, pdev->name, pdev);
+
+	if (error) {
+		dev_err(&pdev->dev, "interrupt not available.\n");
+		return error;
+	}
+
+	error = input_register_device(input);
+	if (error < 0) {
+		dev_err(&pdev->dev, "failed to register input device\n");
+		return error;
+	}
+
+	device_init_wakeup(&pdev->dev, pdata->wakeup);
+	error = dev_pm_set_wake_irq(&pdev->dev, pdata->irq);
+	if (error)
+		dev_err(&pdev->dev, "irq wake enable failed.\n");
+
+	return 0;
+}
+
+static const struct of_device_id imx_snvs_pwrkey_ids[] = {
+	{ .compatible = "fsl,sec-v4.0-pwrkey" },
+	{ /* sentinel */ }
+};
+MODULE_DEVICE_TABLE(of, imx_snvs_pwrkey_ids);
+
+static struct platform_driver imx_snvs_pwrkey_driver = {
+	.driver = {
+		.name = "snvs_pwrkey",
+		.of_match_table = imx_snvs_pwrkey_ids,
+	},
+	.probe = imx_snvs_pwrkey_probe,
+};
+module_platform_driver(imx_snvs_pwrkey_driver);
+
+MODULE_AUTHOR("Freescale Semiconductor");
+MODULE_DESCRIPTION("i.MX snvs power key Driver");
+MODULE_LICENSE("GPL");