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Date: Thu, 2 Mar 2017 01:22:42 +0100
From: Sebastian Reichel <sre@...nel.org>
To: Sebastian Reichel <sre@...nel.org>,
Tony Lindgren <tony@...mide.com>,
Dmitry Torokhov <dmitry.torokhov@...il.com>,
Lee Jones <lee.jones@...aro.org>
Cc: Rob Herring <robh+dt@...nel.org>,
Mark Rutland <mark.rutland@....com>,
linux-input@...r.kernel.org, devicetree@...r.kernel.org,
linux-kernel@...r.kernel.org
Subject: [PATCHv2 2/2] 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@...nel.org>
Signed-off-by: Sebastian Reichel <sre@...nel.org>
---
Changes since PATCHv1:
- Fix device for devm_request_threaded_irq()
- Add Acked-By from Rob Herring (for the DT binding)
- Use newly introduced cpcap_sense_virq to sense the IRQ pin
---
.../devicetree/bindings/input/cpcap-pwrbutton.txt | 20 ++++
drivers/input/misc/Kconfig | 10 ++
drivers/input/misc/Makefile | 1 +
drivers/input/misc/cpcap-pwrbutton.c | 117 +++++++++++++++++++++
4 files changed, 148 insertions(+)
create mode 100644 Documentation/devicetree/bindings/input/cpcap-pwrbutton.txt
create mode 100644 drivers/input/misc/cpcap-pwrbutton.c
diff --git a/Documentation/devicetree/bindings/input/cpcap-pwrbutton.txt b/Documentation/devicetree/bindings/input/cpcap-pwrbutton.txt
new file mode 100644
index 000000000000..0dd0076daf71
--- /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 5b6c52210d20..9f7b72249eac 100644
--- 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 b10523f2878e..b923a9828c88 100644
--- 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
index 000000000000..0abef63217e2
--- /dev/null
+++ b/drivers/input/misc/cpcap-pwrbutton.c
@@ -0,0 +1,117 @@
+/**
+ * CPCAP Power Button Input Driver
+ *
+ * Copyright (C) 2017 Sebastian Reichel <sre@...nel.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@...nel.org>");
--
2.11.0
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