input: cpcap-pwrbutton: New driver

Motorola CPCAP is a PMIC found in multiple smartphones.
This driver adds support for the power/on button and has
been tested in Droid 4.

Acked-by: Rob Herring <robh@kernel.org>
Acked-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
Tested-by: Tony Lindgren <tony@atomide.com>
Signed-off-by: Sebastian Reichel <sre@kernel.org>
Signed-off-by: Lee Jones <lee.jones@linaro.org>

diff --git a/Documentation/devicetree/bindings/input/cpcap-pwrbutton.txt b/Documentation/devicetree/bindings/input/cpcap-pwrbutton.txt
new file mode 100644 (file)
index 0000000..0dd0076
--- /dev/null
+++ b/Documentation/devicetree/bindings/input/cpcap-pwrbutton.txt
@@ -0,0 +1,20 @@
+Motorola CPCAP on key
+
+This module is part of the CPCAP. For more details about the whole
+chip see Documentation/devicetree/bindings/mfd/motorola-cpcap.txt.
+
+This module provides a simple power button event via an Interrupt.
+
+Required properties:
+- compatible: should be one of the following
+   - "motorola,cpcap-pwrbutton"
+- interrupts: irq specifier for CPCAP's ON IRQ
+
+Example:
+
+&cpcap {
+       cpcap_pwrbutton: pwrbutton {
+               compatible = "motorola,cpcap-pwrbutton";
+               interrupts = <23 IRQ_TYPE_NONE>;
+       };
+};

diff --git a/drivers/input/misc/Kconfig b/drivers/input/misc/Kconfig
index 5b6c522..9f7b722 100644 (file)
--- a/drivers/input/misc/Kconfig
+++ b/drivers/input/misc/Kconfig
@@ -316,6 +316,16 @@ config INPUT_COBALT_BTNS
          To compile this driver as a module, choose M here: the
          module will be called cobalt_btns.
 
+config INPUT_CPCAP_PWRBUTTON
+       tristate "CPCAP OnKey"
+       depends on MFD_CPCAP
+       help
+         Say Y here if you want to enable power key reporting via the
+         Motorola CPCAP chip.
+
+         To compile this driver as a module, choose M here. The module will
+         be called cpcap-pwrbutton.
+
 config INPUT_WISTRON_BTNS
        tristate "x86 Wistron laptop button interface"
        depends on X86_32

diff --git a/drivers/input/misc/Makefile b/drivers/input/misc/Makefile
index b10523f..b923a98 100644 (file)
--- a/drivers/input/misc/Makefile
+++ b/drivers/input/misc/Makefile
@@ -24,6 +24,7 @@ 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-$(CONFIG_INPUT_CPCAP_PWRBUTTON)    += cpcap-pwrbutton.o
 obj-$(CONFIG_INPUT_DA9052_ONKEY)       += da9052_onkey.o
 obj-$(CONFIG_INPUT_DA9055_ONKEY)       += da9055_onkey.o
 obj-$(CONFIG_INPUT_DA9063_ONKEY)       += da9063_onkey.o

diff --git a/drivers/input/misc/cpcap-pwrbutton.c b/drivers/input/misc/cpcap-pwrbutton.c
new file mode 100644 (file)
index 0000000..0abef63
--- /dev/null
+++ b/drivers/input/misc/cpcap-pwrbutton.c
@@ -0,0 +1,117 @@
+/**
+ * CPCAP Power Button Input Driver
+ *
+ * Copyright (C) 2017 Sebastian Reichel <sre@kernel.org>
+ *
+ * This file is subject to the terms and conditions of the GNU General
+ * Public License. See the file "COPYING" in the main directory of this
+ * archive for more details.
+ *
+ * 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/init.h>
+#include <linux/kernel.h>
+#include <linux/errno.h>
+#include <linux/input.h>
+#include <linux/interrupt.h>
+#include <linux/regmap.h>
+#include <linux/of.h>
+#include <linux/platform_device.h>
+#include <linux/mfd/motorola-cpcap.h>
+
+#define CPCAP_IRQ_ON 23
+#define CPCAP_IRQ_ON_BITMASK (1 << (CPCAP_IRQ_ON % 16))
+
+struct cpcap_power_button {
+       struct regmap *regmap;
+       struct input_dev *idev;
+       struct device *dev;
+};
+
+static irqreturn_t powerbutton_irq(int irq, void *_button)
+{
+       struct cpcap_power_button *button = _button;
+       int val;
+
+       val = cpcap_sense_virq(button->regmap, irq);
+       if (val < 0) {
+               dev_err(button->dev, "irq read failed: %d", val);
+               return IRQ_HANDLED;
+       }
+
+       pm_wakeup_event(button->dev, 0);
+       input_report_key(button->idev, KEY_POWER, val);
+       input_sync(button->idev);
+
+       return IRQ_HANDLED;
+}
+
+static int cpcap_power_button_probe(struct platform_device *pdev)
+{
+       struct cpcap_power_button *button;
+       int irq = platform_get_irq(pdev, 0);
+       int err;
+
+       button = devm_kmalloc(&pdev->dev, sizeof(*button), GFP_KERNEL);
+       if (!button)
+               return -ENOMEM;
+
+       button->idev = devm_input_allocate_device(&pdev->dev);
+       if (!button->idev)
+               return -ENOMEM;
+
+       button->regmap = dev_get_regmap(pdev->dev.parent, NULL);
+       if (!button->regmap)
+               return -ENODEV;
+
+       button->dev = &pdev->dev;
+
+       button->idev->name = "cpcap-pwrbutton";
+       button->idev->phys = "cpcap-pwrbutton/input0";
+       button->idev->dev.parent = button->dev;
+       input_set_capability(button->idev, EV_KEY, KEY_POWER);
+
+       err = devm_request_threaded_irq(&pdev->dev, irq, NULL,
+               powerbutton_irq, IRQF_ONESHOT, "cpcap_pwrbutton", button);
+       if (err < 0) {
+               dev_err(&pdev->dev, "IRQ request failed: %d\n", err);
+               return err;
+       }
+
+       err = input_register_device(button->idev);
+       if (err) {
+               dev_err(&pdev->dev, "Input register failed: %d\n", err);
+               return err;
+       }
+
+       device_init_wakeup(&pdev->dev, true);
+
+       return 0;
+}
+
+#ifdef CONFIG_OF
+static const struct of_device_id cpcap_pwrbutton_dt_match_table[] = {
+       { .compatible = "motorola,cpcap-pwrbutton" },
+       {},
+};
+MODULE_DEVICE_TABLE(of, cpcap_pwrbutton_dt_match_table);
+#endif
+
+static struct platform_driver cpcap_power_button_driver = {
+       .probe          = cpcap_power_button_probe,
+       .driver         = {
+               .name   = "cpcap-pwrbutton",
+               .of_match_table = of_match_ptr(cpcap_pwrbutton_dt_match_table),
+       },
+};
+module_platform_driver(cpcap_power_button_driver);
+
+MODULE_ALIAS("platform:cpcap-pwrbutton");
+MODULE_DESCRIPTION("CPCAP Power Button");
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("Sebastian Reichel <sre@kernel.org>");