[PATCH v6 13/19] HID: hid-lenovo-go-s: Add Touchpad Mode Attributes

["Derek J. Clark" <derekjohn.clark@gmail.com>]

Adds attributes for managing the touchpad operating modes.

Reviewed-by: Mark Pearson <mpearson-lenovo@squebb.ca>
Signed-off-by: Derek J. Clark <derekjohn.clark@gmail.com>
---
v6:
  - Make local attributes static.
  - Use NULL instead of 0 in mcu_propery_out when there is no data.
---
 drivers/hid/hid-lenovo-go-s.c | 142 ++++++++++++++++++++++++++++++++++
 1 file changed, 142 insertions(+)

diff --git a/drivers/hid/hid-lenovo-go-s.c b/drivers/hid/hid-lenovo-go-s.c
index 97c572cfe66c..5899cabe950f 100644
--- a/drivers/hid/hid-lenovo-go-s.c
+++ b/drivers/hid/hid-lenovo-go-s.c
@@ -47,6 +47,8 @@ static struct hid_gos_cfg {
 	u8 os_mode;
 	u8 rgb_en;
 	u8 tp_en;
+	u8 tp_linux_mode;
+	u8 tp_windows_mode;
 } drvdata;
 
 struct gos_cfg_attr {
@@ -145,6 +147,22 @@ static const char *const dpad_mode_text[] = {
 	[DIR4] = "4-way",
 };
 
+enum touchpad_mode_index {
+	TP_REL,
+	TP_ABS,
+};
+
+static const char *const touchpad_mode_text[] = {
+	[TP_REL] = "relative",
+	[TP_ABS] = "absolute",
+};
+
+enum touchpad_config_index {
+	CFG_WINDOWS_MODE = 0x03,
+	CFG_LINUX_MODE,
+
+};
+
 static int hid_gos_version_event(u8 *data)
 {
 	struct version_report *ver_rep = (struct version_report *)data;
@@ -204,6 +222,25 @@ static int hid_gos_gamepad_cfg_event(struct command_report *cmd_rep)
 	return ret;
 }
 
+static int hid_gos_touchpad_event(struct command_report *cmd_rep)
+{
+	int ret = 0;
+
+	switch (cmd_rep->sub_cmd) {
+	case CFG_LINUX_MODE:
+		drvdata.tp_linux_mode = cmd_rep->data[0];
+		break;
+	case CFG_WINDOWS_MODE:
+		drvdata.tp_windows_mode = cmd_rep->data[0];
+		break;
+	default:
+		ret = -EINVAL;
+		break;
+	}
+
+	return ret;
+}
+
 static int hid_gos_set_event_return(struct command_report *cmd_rep)
 {
 	if (cmd_rep->data[0] != 0)
@@ -251,7 +288,11 @@ static int hid_gos_raw_event(struct hid_device *hdev, struct hid_report *report,
 	case GET_GAMEPAD_CFG:
 		ret = hid_gos_gamepad_cfg_event(cmd_rep);
 		break;
+	case GET_TP_PARAM:
+		ret = hid_gos_touchpad_event(cmd_rep);
+		break;
 	case SET_GAMEPAD_CFG:
+	case SET_TP_PARAM:
 		ret = hid_gos_set_event_return(cmd_rep);
 		break;
 	default:
@@ -530,6 +571,95 @@ static ssize_t gamepad_property_options(struct device *dev,
 	return count;
 }
 
+static ssize_t touchpad_property_store(struct device *dev,
+				       struct device_attribute *attr,
+				       const char *buf, size_t count,
+				       enum touchpad_config_index index)
+{
+	size_t size = 1;
+	u8 val = 0;
+	int ret;
+
+	switch (index) {
+	case CFG_WINDOWS_MODE:
+		ret = sysfs_match_string(touchpad_mode_text, buf);
+		if (ret < 0)
+			return ret;
+		val = ret;
+		break;
+	case CFG_LINUX_MODE:
+		ret = sysfs_match_string(touchpad_mode_text, buf);
+		if (ret < 0)
+			return ret;
+		val = ret;
+		break;
+	default:
+		return -EINVAL;
+	}
+	if (!val)
+		size = 0;
+
+	ret = mcu_property_out(drvdata.hdev, SET_TP_PARAM, index, &val, size);
+	if (ret < 0)
+		return ret;
+
+	return count;
+}
+
+static ssize_t touchpad_property_show(struct device *dev,
+				      struct device_attribute *attr, char *buf,
+				      enum touchpad_config_index index)
+{
+	int ret = 0;
+	u8 i;
+
+	ret = mcu_property_out(drvdata.hdev, GET_TP_PARAM, index, NULL, 0);
+	if (ret < 0)
+		return ret;
+
+	switch (index) {
+	case CFG_WINDOWS_MODE:
+		i = drvdata.tp_windows_mode;
+		break;
+	case CFG_LINUX_MODE:
+		i = drvdata.tp_linux_mode;
+		break;
+	default:
+		return -EINVAL;
+	}
+
+	if (i >= ARRAY_SIZE(touchpad_mode_text))
+		return -EINVAL;
+
+	return sysfs_emit(buf, "%s\n", touchpad_mode_text[i]);
+}
+
+static ssize_t touchpad_property_options(struct device *dev,
+					 struct device_attribute *attr,
+					 char *buf,
+					 enum touchpad_config_index index)
+{
+	size_t count = 0;
+	unsigned int i;
+
+	switch (index) {
+	case CFG_WINDOWS_MODE:
+	case CFG_LINUX_MODE:
+		for (i = 0; i < ARRAY_SIZE(touchpad_mode_text); i++) {
+			count += sysfs_emit_at(buf, count, "%s ",
+					       touchpad_mode_text[i]);
+		}
+		break;
+	default:
+		return count;
+	}
+
+	if (count)
+		buf[count - 1] = '\n';
+
+	return count;
+}
+
 static ssize_t mcu_id_show(struct device *dev, struct device_attribute *attr,
 			   char *buf)
 {
@@ -659,9 +789,21 @@ static struct gos_cfg_attr touchpad_enabled = { FEATURE_TOUCHPAD_ENABLE };
 LEGOS_DEVICE_ATTR_RW(touchpad_enabled, "enabled", index, gamepad);
 static DEVICE_ATTR_RO_NAMED(touchpad_enabled_index, "enabled_index");
 
+static struct gos_cfg_attr touchpad_linux_mode = { CFG_LINUX_MODE };
+LEGOS_DEVICE_ATTR_RW(touchpad_linux_mode, "linux_mode", index, touchpad);
+static DEVICE_ATTR_RO_NAMED(touchpad_linux_mode_index, "linux_mode_index");
+
+static struct gos_cfg_attr touchpad_windows_mode = { CFG_WINDOWS_MODE };
+LEGOS_DEVICE_ATTR_RW(touchpad_windows_mode, "windows_mode", index, touchpad);
+static DEVICE_ATTR_RO_NAMED(touchpad_windows_mode_index, "windows_mode_index");
+
 static struct attribute *legos_touchpad_attrs[] = {
 	&dev_attr_touchpad_enabled.attr,
 	&dev_attr_touchpad_enabled_index.attr,
+	&dev_attr_touchpad_linux_mode.attr,
+	&dev_attr_touchpad_linux_mode_index.attr,
+	&dev_attr_touchpad_windows_mode.attr,
+	&dev_attr_touchpad_windows_mode_index.attr,
 	NULL,
 };
 
-- 
2.53.0