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Subject[PATCH 2/3] input/keyboard: Add support for Dollar Cove TI power button
Date
This provides a new input driver for supporting the power button on
Dollar Cove TI PMIC, found on Cherrytrail-based devices.
The patch is based on the original work by Intel, found at:
https://github.com/01org/ProductionKernelQuilts

Bugzilla: https://bugzilla.kernel.org/show_bug.cgi?id=193891
Signed-off-by: Takashi Iwai <tiwai@suse.de>
---
drivers/input/keyboard/Kconfig | 7 +++
drivers/input/keyboard/Makefile | 1 +
drivers/input/keyboard/dc_ti_pwrbtn.c | 85 +++++++++++++++++++++++++++++++++++
3 files changed, 93 insertions(+)
create mode 100644 drivers/input/keyboard/dc_ti_pwrbtn.c

diff --git a/drivers/input/keyboard/Kconfig b/drivers/input/keyboard/Kconfig
index 4c4ab1ced235..673748b3cc34 100644
--- a/drivers/input/keyboard/Kconfig
+++ b/drivers/input/keyboard/Kconfig
@@ -756,4 +756,11 @@ config KEYBOARD_BCM
To compile this driver as a module, choose M here: the
module will be called bcm-keypad.

+config KEYBOARD_DC_TI_PWRBTN
+ tristate "Dollar Cove TI power button driver"
+ depends on INTEL_SOC_PMIC_DC_TI
+ help
+ Say Y here fi you want to have a power button driver for
+ Dollar Cove TI PMIC.
+
endif
diff --git a/drivers/input/keyboard/Makefile b/drivers/input/keyboard/Makefile
index d2338bacdad1..fa473d241e5c 100644
--- a/drivers/input/keyboard/Makefile
+++ b/drivers/input/keyboard/Makefile
@@ -66,3 +66,4 @@ obj-$(CONFIG_KEYBOARD_TM2_TOUCHKEY) += tm2-touchkey.o
obj-$(CONFIG_KEYBOARD_TWL4030) += twl4030_keypad.o
obj-$(CONFIG_KEYBOARD_XTKBD) += xtkbd.o
obj-$(CONFIG_KEYBOARD_W90P910) += w90p910_keypad.o
+obj-$(CONFIG_KEYBOARD_DC_TI_PWRBTN) += dc_ti_pwrbtn.o
diff --git a/drivers/input/keyboard/dc_ti_pwrbtn.c b/drivers/input/keyboard/dc_ti_pwrbtn.c
new file mode 100644
index 000000000000..a0900a440c92
--- /dev/null
+++ b/drivers/input/keyboard/dc_ti_pwrbtn.c
@@ -0,0 +1,85 @@
+/*
+ * Power button driver for Dollar Cove TI PMIC
+ * Copyright (C) 2014 Intel Corp
+ * Copyright (c) 2017 Takashi Iwai <tiwai@suse.de>
+ */
+
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/interrupt.h>
+#include <linux/slab.h>
+#include <linux/device.h>
+#include <linux/platform_device.h>
+#include <linux/input.h>
+#include <linux/mfd/intel_soc_pmic.h>
+
+#define DC_TI_SIRQ_REG 0x3
+#define SIRQ_PWRBTN_REL (1 << 0)
+
+#define DRIVER_NAME "dc_ti_pwrbtn"
+
+static irqreturn_t dc_ti_pwrbtn_interrupt(int irq, void *dev_id)
+{
+ struct input_dev *pwrbtn_input = dev_id;
+ struct device *dev = pwrbtn_input->dev.parent;
+ struct regmap *regmap = dev_get_drvdata(dev);
+ int state;
+
+ if (!regmap_read(regmap, DC_TI_SIRQ_REG, &state)) {
+ dev_dbg(dev, "SIRQ_REG=0x%x\n", state);
+ state &= SIRQ_PWRBTN_REL;
+ input_event(pwrbtn_input, EV_KEY, KEY_POWER, !state);
+ input_sync(pwrbtn_input);
+ }
+
+ return IRQ_HANDLED;
+}
+
+static int dc_ti_pwrbtn_probe(struct platform_device *pdev)
+{
+ struct device *dev = &pdev->dev;
+ struct intel_soc_pmic *pmic = dev_get_drvdata(dev->parent);
+ struct input_dev *pwrbtn_input;
+ int irq;
+ int ret;
+
+ irq = platform_get_irq(pdev, 0);
+ if (irq < 0)
+ return -EINVAL;
+ pwrbtn_input = devm_input_allocate_device(dev);
+ if (!pwrbtn_input)
+ return -ENOMEM;
+ pwrbtn_input->name = pdev->name;
+ pwrbtn_input->phys = "dc-ti-power/input0";
+ pwrbtn_input->id.bustype = BUS_HOST;
+ pwrbtn_input->dev.parent = dev;
+ input_set_capability(pwrbtn_input, EV_KEY, KEY_POWER);
+ ret = input_register_device(pwrbtn_input);
+ if (ret)
+ return ret;
+
+ dev_set_drvdata(dev, pmic->regmap);
+
+ ret = devm_request_threaded_irq(dev, irq, NULL, dc_ti_pwrbtn_interrupt,
+ 0, KBUILD_MODNAME, pwrbtn_input);
+ if (ret)
+ return ret;
+
+ ret = enable_irq_wake(irq);
+ if (ret)
+ dev_warn(dev, "Can't enable IRQ as wake source: %d\n", ret);
+
+ return 0;
+}
+
+static struct platform_driver dc_ti_pwrbtn_driver = {
+ .driver = {
+ .name = DRIVER_NAME,
+ },
+ .probe = dc_ti_pwrbtn_probe,
+};
+
+module_platform_driver(dc_ti_pwrbtn_driver);
+
+MODULE_LICENSE("GPL v2");
+MODULE_ALIAS("platform:" DRIVER_NAME);
--
2.14.0
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