Input: add OnKey driver for DA9063 MFD part

This adds OnKey driver support for DA9063.

Signed-off-by: Steve Twiss <stwiss.opensource@diasemi.com>
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>

4 files changed, 238 insertions, 0 deletions

diff --git a/drivers/input/misc/Kconfig b/drivers/input/misc/Kconfig
index e5c4de279001..d4f0a817e858 100644
--- a/drivers/input/misc/Kconfig
+++ b/drivers/input/misc/Kconfig
@@ -610,6 +610,16 @@ config INPUT_DA9055_ONKEY
           To compile this driver as a module, choose M here: the module
           will be called da9055_onkey.
 
+config INPUT_DA9063_ONKEY
+        tristate "Dialog DA9063 OnKey"
+        depends on MFD_DA9063
+        help
+          Support the ONKEY of Dialog DA9063 Power Management IC as an
+          input device reporting power button statue.
+
+          To compile this driver as a module, choose M here: the module
+          will be called da9063_onkey.
+
 config INPUT_DM355EVM
         tristate "TI DaVinci DM355 EVM Keypad and IR Remote"
         depends on MFD_DM355EVM_MSP
diff --git a/drivers/input/misc/Makefile b/drivers/input/misc/Makefile
index d3179472474d..53df07dcc23c 100644
--- a/drivers/input/misc/Makefile
+++ b/drivers/input/misc/Makefile
@@ -25,6 +25,7 @@ obj-$(CONFIG_INPUT_CMA3000_I2C)		+= cma3000_d0x_i2c.o
 obj-$(CONFIG_INPUT_COBALT_BTNS)         += cobalt_btns.o
 obj-$(CONFIG_INPUT_DA9052_ONKEY)        += da9052_onkey.o
 obj-$(CONFIG_INPUT_DA9055_ONKEY)        += da9055_onkey.o
+obj-$(CONFIG_INPUT_DA9063_ONKEY)        += da9063_onkey.o
 obj-$(CONFIG_INPUT_DM355EVM)            += dm355evm_keys.o
 obj-$(CONFIG_INPUT_E3X0_BUTTON)         += e3x0-button.o
 obj-$(CONFIG_INPUT_DRV260X_HAPTICS)     += drv260x.o
diff --git a/drivers/input/misc/da9063_onkey.c b/drivers/input/misc/da9063_onkey.c
new file mode 100644
index 000000000000..f577585ef999
--- /dev/null
+++ b/drivers/input/misc/da9063_onkey.c
@@ -0,0 +1,226 @@
+/*
+ * 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);
diff --git a/include/linux/mfd/da9063/pdata.h b/include/linux/mfd/da9063/pdata.h
index 95c8742215a7..612383bd80ae 100644
--- a/include/linux/mfd/da9063/pdata.h
+++ b/include/linux/mfd/da9063/pdata.h
@@ -103,6 +103,7 @@ struct da9063;
 struct da9063_pdata {
         int                             (*init)(struct da9063 *da9063);
         int                             irq_base;
+        bool                            key_power;
         unsigned                        flags;
         struct da9063_regulators_pdata  *regulators_pdata;
         struct led_platform_data        *leds_pdata;