Add resin key support to handle different types of key events
defined in different platforms.
Signed-off-by: Tirupathi Reddy <tirupath@xxxxxxxxxxxxxx>
---
.../bindings/input/qcom,pm8941-pwrkey.txt | 32 +++++++++
drivers/input/misc/pm8941-pwrkey.c | 81 ++++++++++++++++++++++
2 files changed, 113 insertions(+)
diff --git a/Documentation/devicetree/bindings/input/qcom,pm8941-pwrkey.txt b/Documentation/devicetree/bindings/input/qcom,pm8941-pwrkey.txt
index 07bf55f..c671636 100644
--- a/Documentation/devicetree/bindings/input/qcom,pm8941-pwrkey.txt
+++ b/Documentation/devicetree/bindings/input/qcom,pm8941-pwrkey.txt
@@ -32,6 +32,32 @@ PROPERTIES
Definition: presence of this property indicates that the KPDPWR_N pin
should be configured for pull up.
+RESIN SUBNODE
+
+The HW module can generate other optional key events like RESIN(reset-in pin).
+The RESIN pin can be configured to support different key events on different
+platforms. The resin key is described by the following properties.
+
+- interrupts:
+ Usage: required
+ Value type: <prop-encoded-array>
+ Definition: key change interrupt; The format of the specifier is
+ defined by the binding document describing the node's
+ interrupt parent.
+
+- linux,code:
+ Usage: required
+ 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
+
+- bias-pull-up:
+ Usage: optional
+ Value type: <empty>
+ Definition: presence of this property indicates that the RESIN pin
+ should be configured for pull up.
+
EXAMPLE
pwrkey@800 {
@@ -40,4 +66,10 @@ EXAMPLE
interrupts = <0x0 0x8 0 IRQ_TYPE_EDGE_BOTH>;
debounce = <15625>;
bias-pull-up;
+
+ resin {
+ interrupts = <0x0 0x8 1 IRQ_TYPE_EDGE_BOTH>;
+ linux,code = <KEY_VOLUMEDOWN>;
+ bias-pull-up;
+ };
};
diff --git a/drivers/input/misc/pm8941-pwrkey.c b/drivers/input/misc/pm8941-pwrkey.c
index 18ad956..6e45d01 100644
--- a/drivers/input/misc/pm8941-pwrkey.c
+++ b/drivers/input/misc/pm8941-pwrkey.c
@@ -20,6 +20,7 @@
#include <linux/log2.h>
#include <linux/module.h>
#include <linux/of.h>
+#include <linux/of_irq.h>
#include <linux/platform_device.h>
#include <linux/reboot.h>
#include <linux/regmap.h>
@@ -28,6 +29,7 @@
#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
@@ -37,6 +39,7 @@
#define PON_PS_HOLD_TYPE_HARD_RESET 7
#define PON_PULL_CTL 0x70
+#define PON_RESIN_PULL_UP BIT(0)
#define PON_KPDPWR_PULL_UP BIT(1)
#define PON_DBC_CTL 0x71
@@ -46,6 +49,7 @@
struct pm8941_pwrkey {
struct device *dev;
int irq;
+ u32 resin_key_code;
u32 baseaddr;
struct regmap *regmap;
struct input_dev *input;
@@ -130,6 +134,24 @@ 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;
+ u32 key_code = pwrkey->resin_key_code;
+
+ error = regmap_read(pwrkey->regmap,
+ pwrkey->baseaddr + PON_RT_STS, &sts);
+ if (error)
+ return IRQ_HANDLED;
+
+ input_report_key(pwrkey->input, 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);
@@ -153,9 +175,56 @@ 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,
+ struct device_node *np)
+{
+ int error, irq;
+ bool pull_up;
+
+ /*
+ * 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(np, "linux,code", &pwrkey->resin_key_code);
+ if (error) {
+ dev_err(pwrkey->dev, "failed to read key-code for resin key\n");
+ return error;
+ }
+
+ pull_up = of_property_read_bool(np, "bias-pull-up");
+
+ irq = irq_of_parse_and_map(np, 0);
+ if (irq < 0) {
+ dev_err(pwrkey->dev, "failed to get resin irq\n");
+ return -EINVAL;
+ }
+
+ /* Register key configuration */
+ input_set_capability(pwrkey->input, EV_KEY, pwrkey->resin_key_code);
+
+ error = regmap_update_bits(pwrkey->regmap,
+ pwrkey->baseaddr + PON_PULL_CTL,
+ PON_RESIN_PULL_UP,
+ pull_up ? PON_RESIN_PULL_UP : 0);
+ if (error) {
+ dev_err(pwrkey->dev, "failed to set resin pull: %d\n", error);
+ return error;
+ }
+
+ 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;
+ struct device_node *np = NULL;
bool pull_up;
u32 req_delay;
int error;
@@ -241,6 +310,18 @@ static int pm8941_pwrkey_probe(struct platform_device *pdev)
return error;
}
+ np = of_find_node_by_name(pdev->dev.of_node, "resin");
+ if (np) {
+ /* resin key capabilities are defined in device node */
+ error = pm8941_resin_key_init(pwrkey, np);
+ of_node_put(np);
+ 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",
--
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