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Subject[PATCH V2] Input: pm8941-pwrkey: add resin key capabilities
Date
Add resin key support to handle different types of key events
defined in different platforms.

Signed-off-by: Tirupathi Reddy <tirupath@codeaurora.org>
---
.../bindings/input/qcom,pm8941-pwrkey.txt | 20 ++++++-
drivers/input/misc/pm8941-pwrkey.c | 65 +++++++++++++++++++++-
2 files changed, 83 insertions(+), 2 deletions(-)

diff --git a/Documentation/devicetree/bindings/input/qcom,pm8941-pwrkey.txt b/Documentation/devicetree/bindings/input/qcom,pm8941-pwrkey.txt
index 07bf55f..f499cf8 100644
--- a/Documentation/devicetree/bindings/input/qcom,pm8941-pwrkey.txt
+++ b/Documentation/devicetree/bindings/input/qcom,pm8941-pwrkey.txt
@@ -20,6 +20,14 @@ PROPERTIES
defined by the binding document describing the node's
interrupt parent.

+- interrupt-names:
+ Usage: required
+ Value type: <stringlist>
+ Definition: Interrupt names. This list must match up 1-to-1 with the
+ interrupts specified in the 'interrupts' property. "kpdpwr"
+ must be specified and should be the first entry of the list.
+ "resin" may be specified for some platforms.
+
- debounce:
Usage: optional
Value type: <u32>
@@ -32,12 +40,22 @@ PROPERTIES
Definition: presence of this property indicates that the KPDPWR_N pin
should be configured for pull up.

+- linux,code:
+ Usage: required for "resin" key
+ Value type: <u32>
+ Definition: The input key-code associated with the resin key.
+ Use the linux event codes defined in
+ include/dt-bindings/input/linux-event-codes.h
+
EXAMPLE

pwrkey@800 {
compatible = "qcom,pm8941-pwrkey";
reg = <0x800>;
- interrupts = <0x0 0x8 0 IRQ_TYPE_EDGE_BOTH>;
+ interrupts = <0x0 0x8 0 IRQ_TYPE_EDGE_BOTH>,
+ <0x0 0x8 1 IRQ_TYPE_EDGE_BOTH>;
+ interrupt-names = "kpdpwr", "resin";
debounce = <15625>;
bias-pull-up;
+ linux,code = <KEY_VOLUMEDOWN>;
};
diff --git a/drivers/input/misc/pm8941-pwrkey.c b/drivers/input/misc/pm8941-pwrkey.c
index 18ad956..2fffc7c 100644
--- a/drivers/input/misc/pm8941-pwrkey.c
+++ b/drivers/input/misc/pm8941-pwrkey.c
@@ -28,6 +28,7 @@

#define PON_RT_STS 0x10
#define PON_KPDPWR_N_SET BIT(0)
+#define PON_RESIN_N_SET BIT(1)

#define PON_PS_HOLD_RST_CTL 0x5a
#define PON_PS_HOLD_RST_CTL2 0x5b
@@ -46,6 +47,7 @@
struct pm8941_pwrkey {
struct device *dev;
int irq;
+ u32 resin_key_code;
u32 baseaddr;
struct regmap *regmap;
struct input_dev *input;
@@ -130,6 +132,24 @@ static irqreturn_t pm8941_pwrkey_irq(int irq, void *_data)
return IRQ_HANDLED;
}

+static irqreturn_t pm8941_resinkey_irq(int irq, void *_data)
+{
+ struct pm8941_pwrkey *pwrkey = _data;
+ unsigned int sts;
+ int error;
+
+ error = regmap_read(pwrkey->regmap,
+ pwrkey->baseaddr + PON_RT_STS, &sts);
+ if (error)
+ return IRQ_HANDLED;
+
+ input_report_key(pwrkey->input, pwrkey->resin_key_code,
+ !!(sts & PON_RESIN_N_SET));
+ input_sync(pwrkey->input);
+
+ return IRQ_HANDLED;
+}
+
static int __maybe_unused pm8941_pwrkey_suspend(struct device *dev)
{
struct pm8941_pwrkey *pwrkey = dev_get_drvdata(dev);
@@ -153,12 +173,40 @@ static int __maybe_unused pm8941_pwrkey_resume(struct device *dev)
static SIMPLE_DEV_PM_OPS(pm8941_pwr_key_pm_ops,
pm8941_pwrkey_suspend, pm8941_pwrkey_resume);

+static int pm8941_resin_key_init(struct pm8941_pwrkey *pwrkey, int irq)
+{
+ int error;
+
+ /*
+ * Get the standard-key parameters. This might not be
+ * specified if there is no key mapping on the reset line.
+ */
+ error = of_property_read_u32(pwrkey->dev->of_node, "linux,code",
+ &pwrkey->resin_key_code);
+ if (error) {
+ dev_err(pwrkey->dev, "failed to read key-code for resin key\n");
+ return error;
+ }
+
+ /* Register key configuration */
+ input_set_capability(pwrkey->input, EV_KEY, pwrkey->resin_key_code);
+
+ error = devm_request_threaded_irq(pwrkey->dev, irq, NULL,
+ pm8941_resinkey_irq, IRQF_ONESHOT,
+ "pm8941_resinkey", pwrkey);
+ if (error)
+ dev_err(pwrkey->dev, "failed requesting resin key IRQ: %d\n",
+ error);
+
+ return error;
+}
+
static int pm8941_pwrkey_probe(struct platform_device *pdev)
{
struct pm8941_pwrkey *pwrkey;
bool pull_up;
u32 req_delay;
- int error;
+ int error, resin_irq;

if (of_property_read_u32(pdev->dev.of_node, "debounce", &req_delay))
req_delay = 15625;
@@ -241,6 +289,21 @@ static int pm8941_pwrkey_probe(struct platform_device *pdev)
return error;
}

+ resin_irq = platform_get_irq_byname(pdev, "resin");
+ if (resin_irq < 0 && resin_irq != -ENXIO) {
+ if (resin_irq != -EPROBE_DEFER)
+ dev_err(&pdev->dev, "failed to get resin irq\n");
+ return resin_irq;
+ } else if (resin_irq >= 0) {
+ /* resin key capabilities are defined in device node */
+ error = pm8941_resin_key_init(pwrkey, resin_irq);
+ if (error) {
+ dev_err(&pdev->dev, "failed resin key initialization: %d\n",
+ error);
+ return error;
+ }
+ }
+
error = input_register_device(pwrkey->input);
if (error) {
dev_err(&pdev->dev, "failed to register input device: %d\n",
--
QUALCOMM INDIA, on behalf of Qualcomm Innovation Center, Inc. is a member of Code Aurora Forum, hosted by The Linux Foundation
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