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    Subject[PATCH v6 10/11] input: max77650: add onkey support
    Date
    From: Bartosz Golaszewski <bgolaszewski@baylibre.com>

    Add support for the push- and slide-button events for max77650.

    Signed-off-by: Bartosz Golaszewski <bgolaszewski@baylibre.com>
    Acked-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
    ---
    drivers/input/misc/Kconfig | 9 +++
    drivers/input/misc/Makefile | 1 +
    drivers/input/misc/max77650-onkey.c | 121 ++++++++++++++++++++++++++++
    3 files changed, 131 insertions(+)
    create mode 100644 drivers/input/misc/max77650-onkey.c

    diff --git a/drivers/input/misc/Kconfig b/drivers/input/misc/Kconfig
    index ca59a2be9bc5..bb9c45c1269e 100644
    --- a/drivers/input/misc/Kconfig
    +++ b/drivers/input/misc/Kconfig
    @@ -180,6 +180,15 @@ config INPUT_M68K_BEEP
    tristate "M68k Beeper support"
    depends on M68K

    +config INPUT_MAX77650_ONKEY
    + tristate "Maxim MAX77650 ONKEY support"
    + depends on MFD_MAX77650
    + help
    + Support the ONKEY of the MAX77650 PMIC as an input device.
    +
    + To compile this driver as a module, choose M here: the module
    + will be called max77650-onkey.
    +
    config INPUT_MAX77693_HAPTIC
    tristate "MAXIM MAX77693/MAX77843 haptic controller support"
    depends on (MFD_MAX77693 || MFD_MAX77843) && PWM
    diff --git a/drivers/input/misc/Makefile b/drivers/input/misc/Makefile
    index 9d0f9d1ff68f..5bd53590ce60 100644
    --- a/drivers/input/misc/Makefile
    +++ b/drivers/input/misc/Makefile
    @@ -43,6 +43,7 @@ obj-$(CONFIG_INPUT_IXP4XX_BEEPER) += ixp4xx-beeper.o
    obj-$(CONFIG_INPUT_KEYSPAN_REMOTE) += keyspan_remote.o
    obj-$(CONFIG_INPUT_KXTJ9) += kxtj9.o
    obj-$(CONFIG_INPUT_M68K_BEEP) += m68kspkr.o
    +obj-$(CONFIG_INPUT_MAX77650_ONKEY) += max77650-onkey.o
    obj-$(CONFIG_INPUT_MAX77693_HAPTIC) += max77693-haptic.o
    obj-$(CONFIG_INPUT_MAX8925_ONKEY) += max8925_onkey.o
    obj-$(CONFIG_INPUT_MAX8997_HAPTIC) += max8997_haptic.o
    diff --git a/drivers/input/misc/max77650-onkey.c b/drivers/input/misc/max77650-onkey.c
    new file mode 100644
    index 000000000000..fbf6caab7217
    --- /dev/null
    +++ b/drivers/input/misc/max77650-onkey.c
    @@ -0,0 +1,121 @@
    +// SPDX-License-Identifier: GPL-2.0
    +//
    +// Copyright (C) 2018 BayLibre SAS
    +// Author: Bartosz Golaszewski <bgolaszewski@baylibre.com>
    +//
    +// ONKEY driver for MAXIM 77650/77651 charger/power-supply.
    +
    +#include <linux/i2c.h>
    +#include <linux/input.h>
    +#include <linux/interrupt.h>
    +#include <linux/mfd/max77650.h>
    +#include <linux/module.h>
    +#include <linux/platform_device.h>
    +#include <linux/regmap.h>
    +
    +#define MAX77650_ONKEY_MODE_MASK BIT(3)
    +#define MAX77650_ONKEY_MODE_PUSH 0x00
    +#define MAX77650_ONKEY_MODE_SLIDE BIT(3)
    +
    +struct max77650_onkey {
    + struct input_dev *input;
    + unsigned int code;
    +};
    +
    +static irqreturn_t max77650_onkey_falling(int irq, void *data)
    +{
    + struct max77650_onkey *onkey = data;
    +
    + input_report_key(onkey->input, onkey->code, 0);
    + input_sync(onkey->input);
    +
    + return IRQ_HANDLED;
    +}
    +
    +static irqreturn_t max77650_onkey_rising(int irq, void *data)
    +{
    + struct max77650_onkey *onkey = data;
    +
    + input_report_key(onkey->input, onkey->code, 1);
    + input_sync(onkey->input);
    +
    + return IRQ_HANDLED;
    +}
    +
    +static int max77650_onkey_probe(struct platform_device *pdev)
    +{
    + int irq_r, irq_f, error, mode;
    + struct max77650_onkey *onkey;
    + struct device *dev, *parent;
    + struct regmap *map;
    + unsigned int type;
    +
    + dev = &pdev->dev;
    + parent = dev->parent;
    +
    + map = dev_get_regmap(parent, NULL);
    + if (!map)
    + return -ENODEV;
    +
    + onkey = devm_kzalloc(dev, sizeof(*onkey), GFP_KERNEL);
    + if (!onkey)
    + return -ENOMEM;
    +
    + error = device_property_read_u32(dev, "linux,code", &onkey->code);
    + if (error)
    + onkey->code = KEY_POWER;
    +
    + if (device_property_read_bool(dev, "maxim,onkey-slide")) {
    + mode = MAX77650_ONKEY_MODE_SLIDE;
    + type = EV_SW;
    + } else {
    + mode = MAX77650_ONKEY_MODE_PUSH;
    + type = EV_KEY;
    + }
    +
    + error = regmap_update_bits(map, MAX77650_REG_CNFG_GLBL,
    + MAX77650_ONKEY_MODE_MASK, mode);
    + if (error)
    + return error;
    +
    + irq_f = platform_get_irq_byname(pdev, "nEN_F");
    + if (irq_f < 0)
    + return irq_f;
    +
    + irq_r = platform_get_irq_byname(pdev, "nEN_R");
    + if (irq_r < 0)
    + return irq_r;
    +
    + onkey->input = devm_input_allocate_device(dev);
    + if (!onkey->input)
    + return -ENOMEM;
    +
    + onkey->input->name = "max77650_onkey";
    + onkey->input->phys = "max77650_onkey/input0";
    + onkey->input->id.bustype = BUS_I2C;
    + input_set_capability(onkey->input, type, onkey->code);
    +
    + error = devm_request_any_context_irq(dev, irq_f, max77650_onkey_falling,
    + IRQF_ONESHOT, "onkey-down", onkey);
    + if (error < 0)
    + return error;
    +
    + error = devm_request_any_context_irq(dev, irq_r, max77650_onkey_rising,
    + IRQF_ONESHOT, "onkey-up", onkey);
    + if (error < 0)
    + return error;
    +
    + return input_register_device(onkey->input);
    +}
    +
    +static struct platform_driver max77650_onkey_driver = {
    + .driver = {
    + .name = "max77650-onkey",
    + },
    + .probe = max77650_onkey_probe,
    +};
    +module_platform_driver(max77650_onkey_driver);
    +
    +MODULE_DESCRIPTION("MAXIM 77650/77651 ONKEY driver");
    +MODULE_AUTHOR("Bartosz Golaszewski <bgolaszewski@baylibre.com>");
    +MODULE_LICENSE("GPL v2");
    --
    2.20.1
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