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path: root/drivers/input/misc/da9052_onkey.c
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Diffstat (limited to 'drivers/input/misc/da9052_onkey.c')
-rw-r--r--drivers/input/misc/da9052_onkey.c155
1 files changed, 155 insertions, 0 deletions
diff --git a/drivers/input/misc/da9052_onkey.c b/drivers/input/misc/da9052_onkey.c
new file mode 100644
index 000000000..6d1152850
--- /dev/null
+++ b/drivers/input/misc/da9052_onkey.c
@@ -0,0 +1,155 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * ON pin driver for Dialog DA9052 PMICs
+ *
+ * Copyright(c) 2012 Dialog Semiconductor Ltd.
+ *
+ * Author: David Dajun Chen <dchen@diasemi.com>
+ */
+
+#include <linux/input.h>
+#include <linux/module.h>
+#include <linux/platform_device.h>
+#include <linux/workqueue.h>
+
+#include <linux/mfd/da9052/da9052.h>
+#include <linux/mfd/da9052/reg.h>
+
+struct da9052_onkey {
+ struct da9052 *da9052;
+ struct input_dev *input;
+ struct delayed_work work;
+};
+
+static void da9052_onkey_query(struct da9052_onkey *onkey)
+{
+ int ret;
+
+ ret = da9052_reg_read(onkey->da9052, DA9052_STATUS_A_REG);
+ if (ret < 0) {
+ dev_err(onkey->da9052->dev,
+ "Failed to read onkey event err=%d\n", ret);
+ } else {
+ /*
+ * Since interrupt for deassertion of ONKEY pin is not
+ * generated, onkey event state determines the onkey
+ * button state.
+ */
+ bool pressed = !(ret & DA9052_STATUSA_NONKEY);
+
+ input_report_key(onkey->input, KEY_POWER, pressed);
+ input_sync(onkey->input);
+
+ /*
+ * Interrupt is generated only when the ONKEY pin
+ * is asserted. Hence the deassertion of the pin
+ * is simulated through work queue.
+ */
+ if (pressed)
+ schedule_delayed_work(&onkey->work,
+ msecs_to_jiffies(50));
+ }
+}
+
+static void da9052_onkey_work(struct work_struct *work)
+{
+ struct da9052_onkey *onkey = container_of(work, struct da9052_onkey,
+ work.work);
+
+ da9052_onkey_query(onkey);
+}
+
+static irqreturn_t da9052_onkey_irq(int irq, void *data)
+{
+ struct da9052_onkey *onkey = data;
+
+ da9052_onkey_query(onkey);
+
+ return IRQ_HANDLED;
+}
+
+static int da9052_onkey_probe(struct platform_device *pdev)
+{
+ struct da9052 *da9052 = dev_get_drvdata(pdev->dev.parent);
+ struct da9052_onkey *onkey;
+ struct input_dev *input_dev;
+ int error;
+
+ if (!da9052) {
+ dev_err(&pdev->dev, "Failed to get the driver's data\n");
+ return -EINVAL;
+ }
+
+ onkey = kzalloc(sizeof(*onkey), GFP_KERNEL);
+ input_dev = input_allocate_device();
+ if (!onkey || !input_dev) {
+ dev_err(&pdev->dev, "Failed to allocate memory\n");
+ error = -ENOMEM;
+ goto err_free_mem;
+ }
+
+ onkey->input = input_dev;
+ onkey->da9052 = da9052;
+ INIT_DELAYED_WORK(&onkey->work, da9052_onkey_work);
+
+ input_dev->name = "da9052-onkey";
+ input_dev->phys = "da9052-onkey/input0";
+ input_dev->dev.parent = &pdev->dev;
+
+ input_dev->evbit[0] = BIT_MASK(EV_KEY);
+ __set_bit(KEY_POWER, input_dev->keybit);
+
+ error = da9052_request_irq(onkey->da9052, DA9052_IRQ_NONKEY, "ONKEY",
+ da9052_onkey_irq, onkey);
+ if (error < 0) {
+ dev_err(onkey->da9052->dev,
+ "Failed to register ONKEY IRQ: %d\n", error);
+ goto err_free_mem;
+ }
+
+ error = input_register_device(onkey->input);
+ if (error) {
+ dev_err(&pdev->dev, "Unable to register input device, %d\n",
+ error);
+ goto err_free_irq;
+ }
+
+ platform_set_drvdata(pdev, onkey);
+ return 0;
+
+err_free_irq:
+ da9052_free_irq(onkey->da9052, DA9052_IRQ_NONKEY, onkey);
+ cancel_delayed_work_sync(&onkey->work);
+err_free_mem:
+ input_free_device(input_dev);
+ kfree(onkey);
+
+ return error;
+}
+
+static int da9052_onkey_remove(struct platform_device *pdev)
+{
+ struct da9052_onkey *onkey = platform_get_drvdata(pdev);
+
+ da9052_free_irq(onkey->da9052, DA9052_IRQ_NONKEY, onkey);
+ cancel_delayed_work_sync(&onkey->work);
+
+ input_unregister_device(onkey->input);
+ kfree(onkey);
+
+ return 0;
+}
+
+static struct platform_driver da9052_onkey_driver = {
+ .probe = da9052_onkey_probe,
+ .remove = da9052_onkey_remove,
+ .driver = {
+ .name = "da9052-onkey",
+ },
+};
+module_platform_driver(da9052_onkey_driver);
+
+MODULE_AUTHOR("David Dajun Chen <dchen@diasemi.com>");
+MODULE_DESCRIPTION("Onkey driver for DA9052");
+MODULE_LICENSE("GPL");
+MODULE_ALIAS("platform:da9052-onkey");