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Commit 23003a84 authored by Daniel Kurtz's avatar Daniel Kurtz Committed by Henrik Rydberg
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Input: atmel_mxt_ts - read ID information block in one i2c transaction 



Reading the whole info block in one i2c transaction speeds up driver
probe significantly, especially on slower i2c busses.

Signed-off-by: default avatarDaniel Kurtz <djkurtz@chromium.org>
Signed-off-by: default avatarHenrik Rydberg <rydberg@euromail.se>
parent cf94bc09

drivers/input/touchscreen/atmel_mxt_ts.c

+3 −23
Original line number Diff line number Diff line
@@ -36,6 +36,7 @@ 
#define MXT_FW_NAME		"maxtouch.fw"



/* Registers */

#define MXT_INFO		0x00

#define MXT_FAMILY_ID		0x00

#define MXT_VARIANT_ID		0x01

#define MXT_VERSION		0x02
@@ -760,32 +761,11 @@ static int mxt_get_info(struct mxt_data *data) 
	struct i2c_client *client = data->client;

	struct mxt_info *info = &data->info;

	int error;

	u8 val;



	error = mxt_read_reg(client, MXT_FAMILY_ID, &val);

	if (error)

		return error;

	info->family_id = val;



	error = mxt_read_reg(client, MXT_VARIANT_ID, &val);

	if (error)

		return error;

	info->variant_id = val;



	error = mxt_read_reg(client, MXT_VERSION, &val);

	if (error)

		return error;

	info->version = val;



	error = mxt_read_reg(client, MXT_BUILD, &val);

	if (error)

		return error;

	info->build = val;



	error = mxt_read_reg(client, MXT_OBJECT_NUM, &val);

	/* Read 7-byte info block starting at address 0 */

	error = __mxt_read_reg(client, MXT_INFO, sizeof(*info), info);

	if (error)

		return error;

	info->object_num = val;



	return 0;

}