Input: atmel_mxt_ts - implement T15 Key Array support

There is a key array object in many maXTouch chips which allows some X/Y lines to be used as a key array. This patch maps them to a series of keys which may be configured in a platform data array. Signed-off-by: Nick Dyer <[email protected]> Acked-by: Benson Leung <[email protected]> Acked-by: Yufeng Shen <[email protected]>
ggdavisiv · Apr 26, 2016 · 15bb074 · 15bb074
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commit 15bb074
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diff --git a/drivers/input/touchscreen/atmel_mxt_ts.c b/drivers/input/touchscreen/atmel_mxt_ts.c
@@ -254,6 +254,7 @@ struct mxt_data {
 	u8 multitouch;
 	struct t7_config t7_cfg;
 	bool use_retrigen_workaround;
+	unsigned long t15_keystatus;
 
 	/* Cached parameters from object table */
 	u16 T5_address;
@@ -264,6 +265,8 @@ struct mxt_data {
 	u16 T71_address;
 	u8 T9_reportid_min;
 	u8 T9_reportid_max;
+	u8 T15_reportid_min;
+	u8 T15_reportid_max;
 	u16 T18_address;
 	u8 T19_reportid;
 	u8 T42_reportid_min;
@@ -913,6 +916,38 @@ static void mxt_proc_t100_message(struct mxt_data *data, u8 *message)
 	data->update_input = true;
 }
 
+static void mxt_proc_t15_messages(struct mxt_data *data, u8 *msg)
+{
+	struct input_dev *input_dev = data->input_dev;
+	struct device *dev = &data->client->dev;
+	int key;
+	bool curr_state, new_state;
+	bool sync = false;
+	unsigned long keystates = le32_to_cpu(msg[2]);
+
+	for (key = 0; key < data->pdata->t15_num_keys; key++) {
+		curr_state = test_bit(key, &data->t15_keystatus);
+		new_state = test_bit(key, &keystates);
+
+		if (!curr_state && new_state) {
+			dev_dbg(dev, "T15 key press: %u\n", key);
+			__set_bit(key, &data->t15_keystatus);
+			input_event(input_dev, EV_KEY,
+				    data->pdata->t15_keymap[key], 1);
+			sync = true;
+		} else if (curr_state && !new_state) {
+			dev_dbg(dev, "T15 key release: %u\n", key);
+			__clear_bit(key, &data->t15_keystatus);
+			input_event(input_dev, EV_KEY,
+				    data->pdata->t15_keymap[key], 0);
+			sync = true;
+		}
+	}
+
+	if (sync)
+		input_sync(input_dev);
+}
+
 static void mxt_proc_t42_messages(struct mxt_data *data, u8 *msg)
 {
 	struct device *dev = &data->client->dev;
@@ -971,6 +1006,9 @@ static int mxt_proc_message(struct mxt_data *data, u8 *message)
 	} else if (report_id == data->T19_reportid) {
 		mxt_input_button(data, message);
 		data->update_input = true;
+	} else if (report_id >= data->T15_reportid_min
+		   && report_id <= data->T15_reportid_max) {
+		mxt_proc_t15_messages(data, message);
 	} else {
 		mxt_dump_message(data, message);
 	}
@@ -1627,6 +1665,8 @@ static void mxt_free_object_table(struct mxt_data *data)
 	data->T71_address = 0;
 	data->T9_reportid_min = 0;
 	data->T9_reportid_max = 0;
+	data->T15_reportid_min = 0;
+	data->T15_reportid_max = 0;
 	data->T18_address = 0;
 	data->T19_reportid = 0;
 	data->T42_reportid_min = 0;
@@ -1705,6 +1745,10 @@ static int mxt_parse_object_table(struct mxt_data *data,
 						object->num_report_ids - 1;
 			data->num_touchids = object->num_report_ids;
 			break;
+		case MXT_TOUCH_KEYARRAY_T15:
+			data->T15_reportid_min = min_id;
+			data->T15_reportid_max = max_id;
+			break;
 		case MXT_SPT_COMMSCONFIG_T18:
 			data->T18_address = object->start_address;
 			break;
@@ -1973,6 +2017,7 @@ static int mxt_initialize_input_device(struct mxt_data *data)
 	int error;
 	unsigned int num_mt_slots;
 	unsigned int mt_flags = 0;
+	int i;
 
 	switch (data->multitouch) {
 	case MXT_TOUCH_MULTI_T9:
@@ -2086,6 +2131,15 @@ static int mxt_initialize_input_device(struct mxt_data *data)
 				     0, 255, 0, 0);
 	}
 
+	/* For T15 Key Array */
+	if (data->T15_reportid_min) {
+		data->t15_keystatus = 0;
+
+		for (i = 0; i < data->pdata->t15_num_keys; i++)
+			input_set_capability(input_dev, EV_KEY,
+					data->pdata->t15_keymap[i]);
+	}
+
 	input_set_drvdata(input_dev, data);
 
 	error = input_register_device(input_dev);

diff --git a/include/linux/platform_data/atmel_mxt_ts.h b/include/linux/platform_data/atmel_mxt_ts.h
@@ -26,6 +26,8 @@ struct mxt_platform_data {
 	u8 t19_num_keys;
 	const unsigned int *t19_keymap;
 	enum mxt_suspend_mode suspend_mode;
+	int t15_num_keys;
+	const unsigned int *t15_keymap;
 };
 
 #endif /* __LINUX_PLATFORM_DATA_ATMEL_MXT_TS_H */