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Commit 4896fb13 authored by Dmitry Torokhov's avatar Dmitry Torokhov
Browse files

Input: melfas_mip4 - ensure that device is present 



Try a quick read from the device in mip4_query_device() to make sure
that the device is there, as we do not consider failures to retrieve
product name or resolution fatal.

Signed-off-by: default avatarDmitry Torokhov <dmitry.torokhov@gmail.com>
parent f5a28a7d

drivers/input/touchscreen/melfas_mip4.c

+11 −0
Original line number Diff line number Diff line
@@ -253,10 +253,21 @@ static int mip4_get_fw_version(struct mip4_ts *ts) 
 */

static int mip4_query_device(struct mip4_ts *ts)

{

	union i2c_smbus_data dummy;

	int error;

	u8 cmd[2];

	u8 buf[14];



	/*

	 * Make sure there is something at this address as we do not

	 * consider subsequent failures as fatal.

	 */

	if (i2c_smbus_xfer(ts->client->adapter, ts->client->addr,

			   0, I2C_SMBUS_READ, 0, I2C_SMBUS_BYTE, &dummy) < 0) {

		dev_err(&ts->client->dev, "nothing at this address\n");

		return -ENXIO;

	}



	/* Product name */

	cmd[0] = MIP4_R0_INFO;

	cmd[1] = MIP4_R1_INFO_PRODUCT_NAME;