[PATCH v3] Input: elants_i2c - get product id on recovery mode for FW update

[Johnny Chuang <johnny.chuang@emc.com.tw>]

This CL takes the responsibility for getting product/hardware id
on recovery mode.
It will fix firmware update script could not find correspond firmware
file name on recovery mode.
BTW, firmware must need to support reading product/hardware id
on boot code.

Signed-off-by: Johnny Chuang <johnny.chuang@emc.com.tw>
---
 drivers/input/touchscreen/elants_i2c.c | 31 ++++++++++++++++++++-----------
 1 file changed, 20 insertions(+), 11 deletions(-)

diff --git a/drivers/input/touchscreen/elants_i2c.c b/drivers/input/touchscreen/elants_i2c.c
index ac09855..02aec28 100644
--- a/drivers/input/touchscreen/elants_i2c.c
+++ b/drivers/input/touchscreen/elants_i2c.c
@@ -298,7 +298,7 @@ static u16 elants_i2c_parse_version(u8 *buf)
 	return get_unaligned_be32(buf) >> 4;
 }
 
-static int elants_i2c_query_fw_id(struct elants_data *ts)
+static int elants_i2c_query_hw_version(struct elants_data *ts)
 {
 	struct i2c_client *client = ts->client;
 	int error, retry_cnt;
@@ -318,8 +318,13 @@ static int elants_i2c_query_fw_id(struct elants_data *ts)
 			error, (int)sizeof(resp), resp);
 	}
 
-	dev_err(&client->dev,
-		"Failed to read fw id or fw id is invalid\n");
+	if (error) {
+		dev_err(&client->dev,
+			"Failed to read fw id: %d\n", error);
+		return error;
+	}
+
+	dev_err(&client->dev, "Invalid fw id: %#04x\n", ts->hw_version);
 
 	return -EINVAL;
 }
@@ -508,7 +513,7 @@ static int elants_i2c_fastboot(struct i2c_client *client)
 static int elants_i2c_initialize(struct elants_data *ts)
 {
 	struct i2c_client *client = ts->client;
-	int error, retry_cnt;
+	int error, error2, retry_cnt;
 	const u8 hello_packet[] = { 0x55, 0x55, 0x55, 0x55 };
 	const u8 recov_packet[] = { 0x55, 0x55, 0x80, 0x80 };
 	u8 buf[HEADER_SIZE];
@@ -553,18 +558,22 @@ static int elants_i2c_initialize(struct elants_data *ts)
 		}
 	}
 
+	/* hw version is available even if device in recovery state */
+	error2 = elants_i2c_query_hw_version(ts);
 	if (!error)
-		error = elants_i2c_query_fw_id(ts);
+		error = error2;
+
 	if (!error)
 		error = elants_i2c_query_fw_version(ts);
+	if (!error)
+		error = elants_i2c_query_test_version(ts);
+	if (!error)
+		error = elants_i2c_query_bc_version(ts);
+	if (!error)
+		error = elants_i2c_query_ts_info(ts);
 
-	if (error) {
+	if (error)
 		ts->iap_mode = ELAN_IAP_RECOVERY;
-	} else {
-		elants_i2c_query_test_version(ts);
-		elants_i2c_query_bc_version(ts);
-		elants_i2c_query_ts_info(ts);
-	}
 
 	return 0;
 }
-- 
1.8.3.2