--- /dev/null
+/*
+ * OnKey device driver for DA9063
+ * Copyright (C) 2015 Dialog Semiconductor Ltd.
+ *
+ * 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/module.h>
+#include <linux/errno.h>
+#include <linux/input.h>
+#include <linux/interrupt.h>
+#include <linux/platform_device.h>
+#include <linux/workqueue.h>
+#include <linux/regmap.h>
+#include <linux/of.h>
+#include <linux/mfd/da9063/core.h>
+#include <linux/mfd/da9063/pdata.h>
+#include <linux/mfd/da9063/registers.h>
+
+struct da9063_onkey {
+ struct da9063 *hw;
+ struct delayed_work work;
+ struct input_dev *input;
+ struct device *dev;
+ bool key_power;
+};
+
+static void da9063_poll_on(struct work_struct *work)
+{
+ struct da9063_onkey *onkey = container_of(work, struct da9063_onkey,
+ work.work);
+ unsigned int val;
+ int fault_log = 0;
+ bool poll = true;
+ int error;
+
+ /* Poll to see when the pin is released */
+ error = regmap_read(onkey->hw->regmap, DA9063_REG_STATUS_A, &val);
+ if (error) {
+ dev_err(onkey->dev,
+ "Failed to read ON status: %d\n", error);
+ goto err_poll;
+ }
+
+ if (!(val & DA9063_NONKEY)) {
+ error = regmap_update_bits(onkey->hw->regmap,
+ DA9063_REG_CONTROL_B,
+ DA9063_NONKEY_LOCK, 0);
+ if (error) {
+ dev_err(onkey->dev,
+ "Failed to reset the Key Delay %d\n", error);
+ goto err_poll;
+ }
+
+ input_report_key(onkey->input, KEY_POWER, 0);
+ input_sync(onkey->input);
+
+ poll = false;
+ }
+
+ /*
+ * If the fault log KEY_RESET is detected, then clear it
+ * and shut down the system.
+ */
+ error = regmap_read(onkey->hw->regmap,
+ DA9063_REG_FAULT_LOG, &fault_log);
+ if (error) {
+ dev_warn(&onkey->input->dev,
+ "Cannot read FAULT_LOG: %d\n", error);
+ } else if (fault_log & DA9063_KEY_RESET) {
+ error = regmap_write(onkey->hw->regmap,
+ DA9063_REG_FAULT_LOG,
+ DA9063_KEY_RESET);
+ if (error) {
+ dev_warn(&onkey->input->dev,
+ "Cannot reset KEY_RESET fault log: %d\n",
+ error);
+ } else {
+ /* at this point we do any S/W housekeeping
+ * and then send shutdown command
+ */
+ dev_dbg(&onkey->input->dev,
+ "Sending SHUTDOWN to DA9063 ...\n");
+ error = regmap_write(onkey->hw->regmap,
+ DA9063_REG_CONTROL_F,
+ DA9063_SHUTDOWN);
+ if (error)
+ dev_err(&onkey->input->dev,
+ "Cannot SHUTDOWN DA9063: %d\n",
+ error);
+ }
+ }
+
+err_poll:
+ if (poll)
+ schedule_delayed_work(&onkey->work, msecs_to_jiffies(50));
+}
+
+static irqreturn_t da9063_onkey_irq_handler(int irq, void *data)
+{
+ struct da9063_onkey *onkey = data;
+ unsigned int val;
+ int error;
+
+ error = regmap_read(onkey->hw->regmap, DA9063_REG_STATUS_A, &val);
+ if (onkey->key_power && !error && (val & DA9063_NONKEY)) {
+ input_report_key(onkey->input, KEY_POWER, 1);
+ input_sync(onkey->input);
+ schedule_delayed_work(&onkey->work, 0);
+ dev_dbg(onkey->dev, "KEY_POWER pressed.\n");
+ } else {
+ input_report_key(onkey->input, KEY_SLEEP, 1);
+ input_sync(onkey->input);
+ input_report_key(onkey->input, KEY_SLEEP, 0);
+ input_sync(onkey->input);
+ dev_dbg(onkey->dev, "KEY_SLEEP pressed.\n");
+ }
+
+ return IRQ_HANDLED;
+}
+
+static void da9063_cancel_poll(void *data)
+{
+ struct da9063_onkey *onkey = data;
+
+ cancel_delayed_work_sync(&onkey->work);
+}
+
+static int da9063_onkey_probe(struct platform_device *pdev)
+{
+ struct da9063 *da9063 = dev_get_drvdata(pdev->dev.parent);
+ struct da9063_pdata *pdata = dev_get_platdata(da9063->dev);
+ struct da9063_onkey *onkey;
+ int irq;
+ int error;
+
+ onkey = devm_kzalloc(&pdev->dev, sizeof(struct da9063_onkey),
+ GFP_KERNEL);
+ if (!onkey) {
+ dev_err(&pdev->dev, "Failed to allocate memory.\n");
+ return -ENOMEM;
+ }
+
+ onkey->dev = &pdev->dev;
+ onkey->hw = da9063;
+
+ if (pdata)
+ onkey->key_power = pdata->key_power;
+ else
+ onkey->key_power =
+ !of_property_read_bool(pdev->dev.of_node,
+ "dlg,disable-key-power");
+
+ onkey->input = devm_input_allocate_device(&pdev->dev);
+ if (!onkey->input) {
+ dev_err(&pdev->dev, "Failed to allocated input device.\n");
+ return -ENOMEM;
+ }
+
+ onkey->input->name = DA9063_DRVNAME_ONKEY;
+ onkey->input->phys = DA9063_DRVNAME_ONKEY "/input0";
+ onkey->input->dev.parent = &pdev->dev;
+
+ if (onkey->key_power)
+ input_set_capability(onkey->input, EV_KEY, KEY_POWER);
+
+ input_set_capability(onkey->input, EV_KEY, KEY_SLEEP);
+
+ INIT_DELAYED_WORK(&onkey->work, da9063_poll_on);
+
+ error = devm_add_action(&pdev->dev, da9063_cancel_poll, onkey);
+ if (error) {
+ dev_err(&pdev->dev,
+ "Failed to add cancel poll action: %d\n",
+ error);
+ return error;
+ }
+
+ irq = platform_get_irq_byname(pdev, "ONKEY");
+ if (irq < 0) {
+ error = irq;
+ dev_err(&pdev->dev, "Failed to get platform IRQ: %d\n", error);
+ return error;
+ }
+
+ error = devm_request_threaded_irq(&pdev->dev, irq,
+ NULL, da9063_onkey_irq_handler,
+ IRQF_TRIGGER_LOW | IRQF_ONESHOT,
+ "ONKEY", onkey);
+ if (error) {
+ dev_err(&pdev->dev,
+ "Failed to request IRQ %d: %d\n", irq, error);
+ return error;
+ }
+
+ error = input_register_device(onkey->input);
+ if (error) {
+ dev_err(&pdev->dev,
+ "Failed to register input device: %d\n", error);
+ return error;
+ }
+
+ platform_set_drvdata(pdev, onkey);
+ return 0;
+}
+
+static struct platform_driver da9063_onkey_driver = {
+ .probe = da9063_onkey_probe,
+ .driver = {
+ .name = DA9063_DRVNAME_ONKEY,
+ },
+};
+module_platform_driver(da9063_onkey_driver);
+
+MODULE_AUTHOR("S Twiss <stwiss.opensource@diasemi.com>");
+MODULE_DESCRIPTION("Onkey device driver for Dialog DA9063");
+MODULE_LICENSE("GPL");
+MODULE_ALIAS("platform:" DA9063_DRVNAME_ONKEY);
projects / karo-tx-linux.git / commitdiff