1 files changed, 442 insertions, 0 deletions
diff --git a/drivers/input/misc/axp20x-pek.c b/drivers/input/misc/axp20x-pek.c
new file mode 100644
index 000000000..9c6386b2a
--- /dev/null
+++ b/drivers/input/misc/axp20x-pek.c
@@ -0,0 +1,442 @@
+/*
+ * axp20x power button driver.
+ *
+ * Copyright (C) 2013 Carlo Caione <carlo@caione.org>
+ *
+ * This file is subject to the terms and conditions of the GNU General
+ * Public License. See the file "COPYING" in the main directory of this
+ * archive for more details.
+ *
+ * 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/acpi.h>
+#include <linux/errno.h>
+#include <linux/irq.h>
+#include <linux/init.h>
+#include <linux/input.h>
+#include <linux/interrupt.h>
+#include <linux/kernel.h>
+#include <linux/mfd/axp20x.h>
+#include <linux/module.h>
+#include <linux/platform_device.h>
+#include <linux/regmap.h>
+#include <linux/slab.h>
+
+#define AXP20X_PEK_STARTUP_MASK		(0xc0)
+#define AXP20X_PEK_SHUTDOWN_MASK	(0x03)
+
+struct axp20x_info {
+	const struct axp20x_time *startup_time;
+	unsigned int startup_mask;
+	const struct axp20x_time *shutdown_time;
+	unsigned int shutdown_mask;
+};
+
+struct axp20x_pek {
+	struct axp20x_dev *axp20x;
+	struct input_dev *input;
+	struct axp20x_info *info;
+	int irq_dbr;
+	int irq_dbf;
+};
+
+struct axp20x_time {
+	unsigned int time;
+	unsigned int idx;
+};
+
+static const struct axp20x_time startup_time[] = {
+	{ .time = 128,  .idx = 0 },
+	{ .time = 1000, .idx = 2 },
+	{ .time = 3000, .idx = 1 },
+	{ .time = 2000, .idx = 3 },
+};
+
+static const struct axp20x_time axp221_startup_time[] = {
+	{ .time = 128,  .idx = 0 },
+	{ .time = 1000, .idx = 1 },
+	{ .time = 2000, .idx = 2 },
+	{ .time = 3000, .idx = 3 },
+};
+
+static const struct axp20x_time shutdown_time[] = {
+	{ .time = 4000,  .idx = 0 },
+	{ .time = 6000,  .idx = 1 },
+	{ .time = 8000,  .idx = 2 },
+	{ .time = 10000, .idx = 3 },
+};
+
+static const struct axp20x_info axp20x_info = {
+	.startup_time = startup_time,
+	.startup_mask = AXP20X_PEK_STARTUP_MASK,
+	.shutdown_time = shutdown_time,
+	.shutdown_mask = AXP20X_PEK_SHUTDOWN_MASK,
+};
+
+static const struct axp20x_info axp221_info = {
+	.startup_time = axp221_startup_time,
+	.startup_mask = AXP20X_PEK_STARTUP_MASK,
+	.shutdown_time = shutdown_time,
+	.shutdown_mask = AXP20X_PEK_SHUTDOWN_MASK,
+};
+
+static ssize_t axp20x_show_attr(struct device *dev,
+				const struct axp20x_time *time,
+				unsigned int mask, char *buf)
+{
+	struct axp20x_pek *axp20x_pek = dev_get_drvdata(dev);
+	unsigned int val;
+	int ret, i;
+
+	ret = regmap_read(axp20x_pek->axp20x->regmap, AXP20X_PEK_KEY, &val);
+	if (ret != 0)
+		return ret;
+
+	val &= mask;
+	val >>= ffs(mask) - 1;
+
+	for (i = 0; i < 4; i++)
+		if (val == time[i].idx)
+			val = time[i].time;
+
+	return sprintf(buf, "%u\n", val);
+}
+
+static ssize_t axp20x_show_attr_startup(struct device *dev,
+					struct device_attribute *attr,
+					char *buf)
+{
+	struct axp20x_pek *axp20x_pek = dev_get_drvdata(dev);
+
+	return axp20x_show_attr(dev, axp20x_pek->info->startup_time,
+				axp20x_pek->info->startup_mask, buf);
+}
+
+static ssize_t axp20x_show_attr_shutdown(struct device *dev,
+					 struct device_attribute *attr,
+					 char *buf)
+{
+	struct axp20x_pek *axp20x_pek = dev_get_drvdata(dev);
+
+	return axp20x_show_attr(dev, axp20x_pek->info->shutdown_time,
+				axp20x_pek->info->shutdown_mask, buf);
+}
+
+static ssize_t axp20x_store_attr(struct device *dev,
+				 const struct axp20x_time *time,
+				 unsigned int mask, const char *buf,
+				 size_t count)
+{
+	struct axp20x_pek *axp20x_pek = dev_get_drvdata(dev);
+	char val_str[20];
+	size_t len;
+	int ret, i;
+	unsigned int val, idx = 0;
+	unsigned int best_err = UINT_MAX;
+
+	val_str[sizeof(val_str) - 1] = '\0';
+	strncpy(val_str, buf, sizeof(val_str) - 1);
+	len = strlen(val_str);
+
+	if (len && val_str[len - 1] == '\n')
+		val_str[len - 1] = '\0';
+
+	ret = kstrtouint(val_str, 10, &val);
+	if (ret)
+		return ret;
+
+	for (i = 3; i >= 0; i--) {
+		unsigned int err;
+
+		err = abs(time[i].time - val);
+		if (err < best_err) {
+			best_err = err;
+			idx = time[i].idx;
+		}
+
+		if (!err)
+			break;
+	}
+
+	idx <<= ffs(mask) - 1;
+	ret = regmap_update_bits(axp20x_pek->axp20x->regmap, AXP20X_PEK_KEY,
+				 mask, idx);
+	if (ret != 0)
+		return -EINVAL;
+
+	return count;
+}
+
+static ssize_t axp20x_store_attr_startup(struct device *dev,
+					 struct device_attribute *attr,
+					 const char *buf, size_t count)
+{
+	struct axp20x_pek *axp20x_pek = dev_get_drvdata(dev);
+
+	return axp20x_store_attr(dev, axp20x_pek->info->startup_time,
+				 axp20x_pek->info->startup_mask, buf, count);
+}
+
+static ssize_t axp20x_store_attr_shutdown(struct device *dev,
+					  struct device_attribute *attr,
+					  const char *buf, size_t count)
+{
+	struct axp20x_pek *axp20x_pek = dev_get_drvdata(dev);
+
+	return axp20x_store_attr(dev, axp20x_pek->info->shutdown_time,
+				 axp20x_pek->info->shutdown_mask, buf, count);
+}
+
+static DEVICE_ATTR(startup, 0644, axp20x_show_attr_startup,
+		   axp20x_store_attr_startup);
+static DEVICE_ATTR(shutdown, 0644, axp20x_show_attr_shutdown,
+		   axp20x_store_attr_shutdown);
+
+static struct attribute *axp20x_attrs[] = {
+	&dev_attr_startup.attr,
+	&dev_attr_shutdown.attr,
+	NULL,
+};
+ATTRIBUTE_GROUPS(axp20x);
+
+static irqreturn_t axp20x_pek_irq(int irq, void *pwr)
+{
+	struct axp20x_pek *axp20x_pek = pwr;
+	struct input_dev *idev = axp20x_pek->input;
+
+	if (!idev)
+		return IRQ_HANDLED;
+
+	/*
+	 * The power-button is connected to ground so a falling edge (dbf)
+	 * means it is pressed.
+	 */
+	if (irq == axp20x_pek->irq_dbf)
+		input_report_key(idev, KEY_POWER, true);
+	else if (irq == axp20x_pek->irq_dbr)
+		input_report_key(idev, KEY_POWER, false);
+
+	input_sync(idev);
+
+	return IRQ_HANDLED;
+}
+
+static int axp20x_pek_probe_input_device(struct axp20x_pek *axp20x_pek,
+					 struct platform_device *pdev)
+{
+	struct input_dev *idev;
+	int error;
+
+	axp20x_pek->input = devm_input_allocate_device(&pdev->dev);
+	if (!axp20x_pek->input)
+		return -ENOMEM;
+
+	idev = axp20x_pek->input;
+
+	idev->name = "axp20x-pek";
+	idev->phys = "m1kbd/input2";
+	idev->dev.parent = &pdev->dev;
+
+	input_set_capability(idev, EV_KEY, KEY_POWER);
+
+	input_set_drvdata(idev, axp20x_pek);
+
+	error = input_register_device(idev);
+	if (error) {
+		dev_err(&pdev->dev, "Can't register input device: %d\n",
+			error);
+		return error;
+	}
+
+	return 0;
+}
+
+#ifdef CONFIG_ACPI
+static bool axp20x_pek_should_register_input(struct axp20x_pek *axp20x_pek,
+					     struct platform_device *pdev)
+{
+	unsigned long long hrv = 0;
+	acpi_status status;
+
+	if (IS_ENABLED(CONFIG_INPUT_SOC_BUTTON_ARRAY) &&
+	    axp20x_pek->axp20x->variant == AXP288_ID) {
+		status = acpi_evaluate_integer(ACPI_HANDLE(pdev->dev.parent),
+					       "_HRV", NULL, &hrv);
+		if (ACPI_FAILURE(status))
+			dev_err(&pdev->dev, "Failed to get PMIC hardware revision\n");
+
+		/*
+		 * On Cherry Trail platforms (hrv == 3), do not register the
+		 * input device if there is an "INTCFD9" or "ACPI0011" gpio
+		 * button ACPI device, as that handles the power button too,
+		 * and otherwise we end up reporting all presses twice.
+		 */
+		if (hrv == 3 && (acpi_dev_present("INTCFD9", NULL, -1) ||
+				 acpi_dev_present("ACPI0011", NULL, -1)))
+			return false;
+
+	}
+
+	return true;
+}
+#else
+static bool axp20x_pek_should_register_input(struct axp20x_pek *axp20x_pek,
+					     struct platform_device *pdev)
+{
+	return true;
+}
+#endif
+
+static int axp20x_pek_probe(struct platform_device *pdev)
+{
+	struct axp20x_pek *axp20x_pek;
+	const struct platform_device_id *match = platform_get_device_id(pdev);
+	int error;
+
+	if (!match) {
+		dev_err(&pdev->dev, "Failed to get platform_device_id\n");
+		return -EINVAL;
+	}
+
+	axp20x_pek = devm_kzalloc(&pdev->dev, sizeof(struct axp20x_pek),
+				  GFP_KERNEL);
+	if (!axp20x_pek)
+		return -ENOMEM;
+
+	axp20x_pek->axp20x = dev_get_drvdata(pdev->dev.parent);
+
+	axp20x_pek->irq_dbr = platform_get_irq_byname(pdev, "PEK_DBR");
+	if (axp20x_pek->irq_dbr < 0)
+		return axp20x_pek->irq_dbr;
+	axp20x_pek->irq_dbr = regmap_irq_get_virq(
+			axp20x_pek->axp20x->regmap_irqc, axp20x_pek->irq_dbr);
+
+	axp20x_pek->irq_dbf = platform_get_irq_byname(pdev, "PEK_DBF");
+	if (axp20x_pek->irq_dbf < 0)
+		return axp20x_pek->irq_dbf;
+	axp20x_pek->irq_dbf = regmap_irq_get_virq(
+			axp20x_pek->axp20x->regmap_irqc, axp20x_pek->irq_dbf);
+
+	if (axp20x_pek_should_register_input(axp20x_pek, pdev)) {
+		error = axp20x_pek_probe_input_device(axp20x_pek, pdev);
+		if (error)
+			return error;
+	}
+
+	axp20x_pek->info = (struct axp20x_info *)match->driver_data;
+
+	error = devm_request_any_context_irq(&pdev->dev, axp20x_pek->irq_dbr,
+					     axp20x_pek_irq, 0,
+					     "axp20x-pek-dbr", axp20x_pek);
+	if (error < 0) {
+		dev_err(&pdev->dev, "Failed to request dbr IRQ#%d: %d\n",
+			axp20x_pek->irq_dbr, error);
+		return error;
+	}
+
+	error = devm_request_any_context_irq(&pdev->dev, axp20x_pek->irq_dbf,
+					  axp20x_pek_irq, 0,
+					  "axp20x-pek-dbf", axp20x_pek);
+	if (error < 0) {
+		dev_err(&pdev->dev, "Failed to request dbf IRQ#%d: %d\n",
+			axp20x_pek->irq_dbf, error);
+		return error;
+	}
+
+	device_init_wakeup(&pdev->dev, true);
+
+	platform_set_drvdata(pdev, axp20x_pek);
+
+	return 0;
+}
+
+static int __maybe_unused axp20x_pek_suspend(struct device *dev)
+{
+	struct axp20x_pek *axp20x_pek = dev_get_drvdata(dev);
+
+	/*
+	 * As nested threaded IRQs are not automatically disabled during
+	 * suspend, we must explicitly disable non-wakeup IRQs.
+	 */
+	if (device_may_wakeup(dev)) {
+		enable_irq_wake(axp20x_pek->irq_dbf);
+		enable_irq_wake(axp20x_pek->irq_dbr);
+	} else {
+		disable_irq(axp20x_pek->irq_dbf);
+		disable_irq(axp20x_pek->irq_dbr);
+	}
+
+	return 0;
+}
+
+static int __maybe_unused axp20x_pek_resume(struct device *dev)
+{
+	struct axp20x_pek *axp20x_pek = dev_get_drvdata(dev);
+
+	if (device_may_wakeup(dev)) {
+		disable_irq_wake(axp20x_pek->irq_dbf);
+		disable_irq_wake(axp20x_pek->irq_dbr);
+	} else {
+		enable_irq(axp20x_pek->irq_dbf);
+		enable_irq(axp20x_pek->irq_dbr);
+	}
+
+	return 0;
+}
+
+static int __maybe_unused axp20x_pek_resume_noirq(struct device *dev)
+{
+	struct axp20x_pek *axp20x_pek = dev_get_drvdata(dev);
+
+	if (axp20x_pek->axp20x->variant != AXP288_ID)
+		return 0;
+
+	/*
+	 * Clear interrupts from button presses during suspend, to avoid
+	 * a wakeup power-button press getting reported to userspace.
+	 */
+	regmap_write(axp20x_pek->axp20x->regmap,
+		     AXP20X_IRQ1_STATE + AXP288_IRQ_POKN / 8,
+		     BIT(AXP288_IRQ_POKN % 8));
+
+	return 0;
+}
+
+static const struct dev_pm_ops axp20x_pek_pm_ops = {
+	SET_SYSTEM_SLEEP_PM_OPS(axp20x_pek_suspend, axp20x_pek_resume)
+#ifdef CONFIG_PM_SLEEP
+	.resume_noirq = axp20x_pek_resume_noirq,
+#endif
+};
+
+static const struct platform_device_id axp_pek_id_match[] = {
+	{
+		.name = "axp20x-pek",
+		.driver_data = (kernel_ulong_t)&axp20x_info,
+	},
+	{
+		.name = "axp221-pek",
+		.driver_data = (kernel_ulong_t)&axp221_info,
+	},
+	{ /* sentinel */ }
+};
+MODULE_DEVICE_TABLE(platform, axp_pek_id_match);
+
+static struct platform_driver axp20x_pek_driver = {
+	.probe		= axp20x_pek_probe,
+	.id_table	= axp_pek_id_match,
+	.driver		= {
+		.name		= "axp20x-pek",
+		.pm		= &axp20x_pek_pm_ops,
+		.dev_groups	= axp20x_groups,
+	},
+};
+module_platform_driver(axp20x_pek_driver);
+
+MODULE_DESCRIPTION("axp20x Power Button");
+MODULE_AUTHOR("Carlo Caione <carlo@caione.org>");
+MODULE_LICENSE("GPL");