kernel: add touch_count sysfs for touchscreen drivers (#70)

* feat: add touch_count sysfs attribute for s6sy761 and edt-ft5x06

Expose a touch_count sysfs attribute on both the Samsung (s6sy761) and
FocalTech (edt-ft5x06) touchscreen drivers, incrementing on each finger
release. This is needed by comma.sh to detect tap-based factory reset
during early boot. Also fix comma.sh to reference input0 instead of
input2 to match mainline kernel input device numbering.

Tested on device: 1 tap=1, 3 taps=3, 5 taps=5.

* fix: use glob for touch_count input device lookup

Use /sys/class/input/input*/device/touch_count so comma.sh works on
both mainline (input0) and vendor kernel (input2).

* move

Author: greatgitsby

kernel/patches/0008-input-edt-ft5x06-add-touch_count-sysfs-attribute.patch

@@ -0,0 +1,47 @@
+diff --git a/drivers/input/touchscreen/edt-ft5x06.c b/drivers/input/touchscreen/edt-ft5x06.c
+index bf498bd4d..98871ecc8 100644
+--- a/drivers/input/touchscreen/edt-ft5x06.c
++++ b/drivers/input/touchscreen/edt-ft5x06.c
+@@ -146,6 +146,7 @@ struct edt_ft5x06_ts_data {
+ 	enum edt_ver version;
+ 	unsigned int crc_errors;
+ 	unsigned int header_errors;
++	u64 touch_count;
+ };
+ 
+ struct edt_i2c_chip_data {
+@@ -337,6 +338,8 @@ static irqreturn_t edt_ft5x06_ts_isr(int irq, void *dev_id)
+ 					       type != TOUCH_EVENT_UP))
+ 			touchscreen_report_pos(tsdata->input, &tsdata->prop,
+ 					       x, y, true);
++		else if (type == TOUCH_EVENT_UP)
++			tsdata->touch_count++;
+ 	}
+ 
+ 	input_mt_report_pointer_emulation(tsdata->input, true);
+@@ -566,6 +569,17 @@ static ssize_t crc_errors_show(struct device *dev,
+ 
+ static DEVICE_ATTR_RO(crc_errors);
+ 
++static ssize_t touch_count_show(struct device *dev,
++				struct device_attribute *attr, char *buf)
++{
++	struct i2c_client *client = to_i2c_client(dev);
++	struct edt_ft5x06_ts_data *tsdata = i2c_get_clientdata(client);
++
++	return sysfs_emit(buf, "%llu\n", tsdata->touch_count);
++}
++
++static DEVICE_ATTR_RO(touch_count);
++
+ static struct attribute *edt_ft5x06_attrs[] = {
+ 	&edt_ft5x06_attr_gain.dattr.attr,
+ 	&edt_ft5x06_attr_offset.dattr.attr,
+@@ -577,6 +591,7 @@ static struct attribute *edt_ft5x06_attrs[] = {
+ 	&dev_attr_fw_version.attr,
+ 	&dev_attr_header_errors.attr,
+ 	&dev_attr_crc_errors.attr,
++	&dev_attr_touch_count.attr,
+ 	NULL
+ };
+ ATTRIBUTE_GROUPS(edt_ft5x06);

kernel/patches/0009-input-s6sy761-add-touch_count-sysfs-attribute.patch

@@ -0,0 +1,41 @@
+diff --git a/drivers/input/touchscreen/s6sy761.c b/drivers/input/touchscreen/s6sy761.c
+index e1518a75a..2d38133d9 100644
+--- a/drivers/input/touchscreen/s6sy761.c
++++ b/drivers/input/touchscreen/s6sy761.c
+@@ -108,6 +108,8 @@ struct s6sy761_data {
+ 
+ 	u16 devid;
+ 	u8 tx_channel;
++
++	u64 touch_count;
+ };
+ 
+ /*
+@@ -165,6 +167,7 @@ static void s6sy761_report_release(struct s6sy761_data *sdata,
+ {
+ 	input_mt_slot(sdata->input, tid);
+ 	input_mt_report_slot_state(sdata->input, MT_TOOL_FINGER, false);
++	sdata->touch_count++;
+ 
+ 	input_sync(sdata->input);
+ }
+@@ -282,8 +285,19 @@ static ssize_t s6sy761_sysfs_devid(struct device *dev,
+ 
+ static DEVICE_ATTR(devid, 0444, s6sy761_sysfs_devid, NULL);
+ 
++static ssize_t s6sy761_sysfs_touch_count(struct device *dev,
++				struct device_attribute *attr, char *buf)
++{
++	struct s6sy761_data *sdata = dev_get_drvdata(dev);
++
++	return sprintf(buf, "%llu\n", sdata->touch_count);
++}
++
++static DEVICE_ATTR(touch_count, 0444, s6sy761_sysfs_touch_count, NULL);
++
+ static struct attribute *s6sy761_sysfs_attrs[] = {
+ 	&dev_attr_devid.attr,
++	&dev_attr_touch_count.attr,
+ 	NULL
+ };
+ ATTRIBUTE_GROUPS(s6sy761_sysfs);

userspace/root/usr/comma/comma.sh

@@ -61,7 +61,7 @@ if [ ! -f /tmp/booted ]; then
     echo "launching system reset, reset trigger present"
     rm -f $RESET_TRIGGER
     $RESET
-  elif (( "$(cat /sys/class/input/input2/device/touch_count)" > 4 )); then
+  elif (( "$(cat /sys/class/input/input*/device/touch_count 2>/dev/null | head -1)" > 4 )); then
     echo "launching system reset, got taps"
     $RESET --tap-reset
   elif ! mountpoint -q /data; then