Input: add support for OnKey module for DA9052/53 PMIC

On-key Driver for Dialog Semiconductor DA9052/53 PMICs.

Signed-off-by: David Dajun Chen <dchen@diasemi.com>
Signed-off-by: Ashish Jangam <ashish.jangam@kpitcummins.com>
Signed-off-by: Dmitry Torokhov <dtor@mail.ru>

3 files changed, 180 insertions, 0 deletions

diff --git a/drivers/input/misc/Kconfig b/drivers/input/misc/Kconfig
index c528deadd63..eb07e88162a 100644
--- a/drivers/input/misc/Kconfig
+++ b/drivers/input/misc/Kconfig
@@ -455,6 +455,16 @@ config INPUT_RB532_BUTTON
           To compile this driver as a module, choose M here: the
           module will be called rb532_button.
 
+config INPUT_DA9052_ONKEY
+        tristate "Dialog DA9052/DA9053 Onkey"
+        depends on PMIC_DA9052
+        help
+          Support the ONKEY of Dialog DA9052 PMICs as an input device
+          reporting power button status.
+
+          To compile this driver as a module, choose M here: the
+          module will be called da9052_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 46671a875b9..a6d8de06914 100644
--- a/drivers/input/misc/Makefile
+++ b/drivers/input/misc/Makefile
@@ -21,6 +21,7 @@ obj-$(CONFIG_INPUT_CM109)		+= cm109.o
 obj-$(CONFIG_INPUT_CMA3000)             += cma3000_d0x.o
 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_DM355EVM)            += dm355evm_keys.o
 obj-$(CONFIG_INPUT_GP2A)                += gp2ap002a00f.o
 obj-$(CONFIG_INPUT_GPIO_TILT_POLLED)    += gpio_tilt_polled.o
diff --git a/drivers/input/misc/da9052_onkey.c b/drivers/input/misc/da9052_onkey.c
new file mode 100644
index 00000000000..34aebb8cd08
--- /dev/null
+++ b/drivers/input/misc/da9052_onkey.c
@@ -0,0 +1,169 @@
+/*
+ * ON pin driver for Dialog DA9052 PMICs
+ *
+ * Copyright(c) 2012 Dialog Semiconductor Ltd.
+ *
+ * Author: David Dajun Chen <dchen@diasemi.com>
+ *
+ * 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.
+ */
+
+#include <linux/init.h>
+#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;
+        unsigned int irq;
+};
+
+static void da9052_onkey_query(struct da9052_onkey *onkey)
+{
+        int key_stat;
+
+        key_stat = da9052_reg_read(onkey->da9052, DA9052_EVENT_B_REG);
+        if (key_stat < 0) {
+                dev_err(onkey->da9052->dev,
+                        "Failed to read onkey event %d\n", key_stat);
+        } else {
+                /*
+                 * Since interrupt for deassertion of ONKEY pin is not
+                 * generated, onkey event state determines the onkey
+                 * button state.
+                 */
+                key_stat &= DA9052_EVENTB_ENONKEY;
+                input_report_key(onkey->input, KEY_POWER, key_stat);
+                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 (key_stat)
+                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 __devinit 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 irq;
+        int error;
+
+        if (!da9052) {
+                dev_err(&pdev->dev, "Failed to get the driver's data\n");
+                return -EINVAL;
+        }
+
+        irq = platform_get_irq_byname(pdev, "ONKEY");
+        if (irq < 0) {
+                dev_err(&pdev->dev,
+                        "Failed to get an IRQ for input device, %d\n", irq);
+                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");
+                return -ENOMEM;
+        }
+
+        onkey->input = input_dev;
+        onkey->da9052 = da9052;
+        onkey->irq = irq;
+        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 = request_threaded_irq(onkey->irq, NULL, da9052_onkey_irq,
+                                     IRQF_TRIGGER_LOW | IRQF_ONESHOT,
+                                     "ONKEY", onkey);
+        if (error < 0) {
+                dev_err(onkey->da9052->dev,
+                        "Failed to register ONKEY IRQ %d, error = %d\n",
+                        onkey->irq, 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:
+        free_irq(onkey->irq, onkey);
+        cancel_delayed_work_sync(&onkey->work);
+err_free_mem:
+        input_free_device(input_dev);
+        kfree(onkey);
+
+        return error;
+}
+
+static int __devexit da9052_onkey_remove(struct platform_device *pdev)
+{
+        struct da9052_onkey *onkey = platform_get_drvdata(pdev);
+
+        free_irq(onkey->irq, 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 = __devexit_p(da9052_onkey_remove),
+        .driver = {
+                .name   = "da9052-onkey",
+                .owner  = THIS_MODULE,
+        },
+};
+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");