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path: root/drivers/input/misc/cpcap-pwrbutton.c
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Diffstat (limited to 'drivers/input/misc/cpcap-pwrbutton.c')
-rw-r--r--drivers/input/misc/cpcap-pwrbutton.c112
1 files changed, 112 insertions, 0 deletions
diff --git a/drivers/input/misc/cpcap-pwrbutton.c b/drivers/input/misc/cpcap-pwrbutton.c
new file mode 100644
index 0000000000..85cddb8471
--- /dev/null
+++ b/drivers/input/misc/cpcap-pwrbutton.c
@@ -0,0 +1,112 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * CPCAP Power Button Input Driver
+ *
+ * Copyright (C) 2017 Sebastian Reichel <sre@kernel.org>
+ */
+
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/kernel.h>
+#include <linux/errno.h>
+#include <linux/input.h>
+#include <linux/interrupt.h>
+#include <linux/regmap.h>
+#include <linux/of.h>
+#include <linux/platform_device.h>
+#include <linux/mfd/motorola-cpcap.h>
+
+#define CPCAP_IRQ_ON 23
+#define CPCAP_IRQ_ON_BITMASK (1 << (CPCAP_IRQ_ON % 16))
+
+struct cpcap_power_button {
+ struct regmap *regmap;
+ struct input_dev *idev;
+ struct device *dev;
+};
+
+static irqreturn_t powerbutton_irq(int irq, void *_button)
+{
+ struct cpcap_power_button *button = _button;
+ int val;
+
+ val = cpcap_sense_virq(button->regmap, irq);
+ if (val < 0) {
+ dev_err(button->dev, "irq read failed: %d", val);
+ return IRQ_HANDLED;
+ }
+
+ pm_wakeup_event(button->dev, 0);
+ input_report_key(button->idev, KEY_POWER, val);
+ input_sync(button->idev);
+
+ return IRQ_HANDLED;
+}
+
+static int cpcap_power_button_probe(struct platform_device *pdev)
+{
+ struct cpcap_power_button *button;
+ int irq;
+ int err;
+
+ irq = platform_get_irq(pdev, 0);
+ if (irq < 0)
+ return irq;
+
+ button = devm_kmalloc(&pdev->dev, sizeof(*button), GFP_KERNEL);
+ if (!button)
+ return -ENOMEM;
+
+ button->idev = devm_input_allocate_device(&pdev->dev);
+ if (!button->idev)
+ return -ENOMEM;
+
+ button->regmap = dev_get_regmap(pdev->dev.parent, NULL);
+ if (!button->regmap)
+ return -ENODEV;
+
+ button->dev = &pdev->dev;
+
+ button->idev->name = "cpcap-pwrbutton";
+ button->idev->phys = "cpcap-pwrbutton/input0";
+ input_set_capability(button->idev, EV_KEY, KEY_POWER);
+
+ err = devm_request_threaded_irq(&pdev->dev, irq, NULL,
+ powerbutton_irq, IRQF_ONESHOT, "cpcap_pwrbutton", button);
+ if (err < 0) {
+ dev_err(&pdev->dev, "IRQ request failed: %d\n", err);
+ return err;
+ }
+
+ err = input_register_device(button->idev);
+ if (err) {
+ dev_err(&pdev->dev, "Input register failed: %d\n", err);
+ return err;
+ }
+
+ device_init_wakeup(&pdev->dev, true);
+
+ return 0;
+}
+
+#ifdef CONFIG_OF
+static const struct of_device_id cpcap_pwrbutton_dt_match_table[] = {
+ { .compatible = "motorola,cpcap-pwrbutton" },
+ {},
+};
+MODULE_DEVICE_TABLE(of, cpcap_pwrbutton_dt_match_table);
+#endif
+
+static struct platform_driver cpcap_power_button_driver = {
+ .probe = cpcap_power_button_probe,
+ .driver = {
+ .name = "cpcap-pwrbutton",
+ .of_match_table = of_match_ptr(cpcap_pwrbutton_dt_match_table),
+ },
+};
+module_platform_driver(cpcap_power_button_driver);
+
+MODULE_ALIAS("platform:cpcap-pwrbutton");
+MODULE_DESCRIPTION("CPCAP Power Button");
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("Sebastian Reichel <sre@kernel.org>");