[PATCH] input: touchscreen: imagis: Add touch key support

["Duje Mihanović" <duje.mihanovic@skole.hr>]

IST3032C (and possibly some other models) has touch keys. Add support
for them to the imagis driver.

Signed-off-by: Duje Mihanović <duje.mihanovic@skole.hr>
---
This patch depends on the series generalizing the driver and adding IST3032C
support: https://lore.kernel.org/all/20231003133440.4696-1-karelb@gimli.ms.mff.cuni.cz/
---
 drivers/input/touchscreen/imagis.c | 14 +++++++++++++-
 1 file changed, 13 insertions(+), 1 deletion(-)

diff --git a/drivers/input/touchscreen/imagis.c b/drivers/input/touchscreen/imagis.c
index 41f28e6e9cb1..5a54ce291655 100644
--- a/drivers/input/touchscreen/imagis.c
+++ b/drivers/input/touchscreen/imagis.c
@@ -30,6 +30,7 @@
 #define IST3038C_FINGER_COUNT_MASK	GENMASK(15, 12)
 #define IST3038C_FINGER_COUNT_SHIFT	12
 #define IST3038C_FINGER_STATUS_MASK	GENMASK(9, 0)
+#define IST3032C_KEY_STATUS_MASK	GENMASK(20, 16)
 
 #define IST3038B_REG_STATUS		0x20
 #define IST3038B_REG_CHIPID		0x30
@@ -43,6 +44,7 @@ struct imagis_properties {
 	unsigned int whoami_cmd;
 	unsigned int whoami_val;
 	bool protocol_b;
+	bool touch_keys_supported;
 };
 
 struct imagis_ts {
@@ -95,7 +97,7 @@ static irqreturn_t imagis_interrupt(int irq, void *dev_id)
 {
 	struct imagis_ts *ts = dev_id;
 	u32 intr_message, finger_status;
-	unsigned int finger_count, finger_pressed;
+	unsigned int finger_count, finger_pressed, key_pressed;
 	int i;
 	int error;
 
@@ -144,6 +146,11 @@ static irqreturn_t imagis_interrupt(int irq, void *dev_id)
 					IST3038C_AREA_SHIFT);
 	}
 
+	key_pressed = FIELD_GET(IST3032C_KEY_STATUS_MASK, intr_message);
+
+	input_report_key(ts->input_dev, KEY_APPSELECT, (key_pressed & BIT(0)));
+	input_report_key(ts->input_dev, KEY_BACK, (key_pressed & BIT(1)));
+
 	input_mt_sync_frame(ts->input_dev);
 	input_sync(ts->input_dev);
 
@@ -229,6 +236,10 @@ static int imagis_init_input_dev(struct imagis_ts *ts)
 	input_set_capability(input_dev, EV_ABS, ABS_MT_POSITION_X);
 	input_set_capability(input_dev, EV_ABS, ABS_MT_POSITION_Y);
 	input_set_abs_params(input_dev, ABS_MT_TOUCH_MAJOR, 0, 16, 0, 0);
+	if (ts->tdata->touch_keys_supported) {
+		input_set_capability(input_dev, EV_KEY, KEY_BACK);
+		input_set_capability(input_dev, EV_KEY, KEY_APPSELECT);
+	}
 
 	touchscreen_parse_properties(input_dev, true, &ts->prop);
 	if (!ts->prop.max_x || !ts->prop.max_y) {
@@ -370,6 +381,7 @@ static const struct imagis_properties imagis_3032c_data = {
 	.touch_coord_cmd = IST3038C_REG_TOUCH_COORD,
 	.whoami_cmd = IST3038C_REG_CHIPID,
 	.whoami_val = IST3032C_WHOAMI,
+	.touch_keys_supported = true,
 };
 
 static const struct imagis_properties imagis_3038b_data = {
-- 
2.42.1