linux-kernel - [PATCH 15/20] Input: atmel_mxt_ts - optimize writing of object table entries

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Message-Id: <1331640263-18935-16-git-send-email-djkurtz@chromium.org>
Date:	Tue, 13 Mar 2012 20:04:18 +0800
From:	Daniel Kurtz <djkurtz@...omium.org>
To:	Dmitry Torokhov <dmitry.torokhov@...il.com>,
	Joonyoung Shim <jy0922.shim@...sung.com>,
	Iiro Valkonen <iiro.valkonen@...el.com>,
	Henrik Rydberg <rydberg@...omail.se>,
	linux-input@...r.kernel.org, linux-kernel@...r.kernel.org
Cc:	Benson Leung <bleung@...omium.org>,
	Yufeng Shen <miletus@...omium.org>,
	Daniel Kurtz <djkurtz@...omium.org>
Subject: [PATCH 15/20] Input: atmel_mxt_ts - optimize writing of object table entries

Write each object using a single bulk i2c write transfer.

Signed-off-by: Daniel Kurtz <djkurtz@...omium.org>
---
 drivers/input/touchscreen/atmel_mxt_ts.c |   28 ++++++++++++++--------------
 1 files changed, 14 insertions(+), 14 deletions(-)

diff --git a/drivers/input/touchscreen/atmel_mxt_ts.c b/drivers/input/touchscreen/atmel_mxt_ts.c
index 9e1ce03..0277381 100644
--- a/drivers/input/touchscreen/atmel_mxt_ts.c
+++ b/drivers/input/touchscreen/atmel_mxt_ts.c
@@ -609,33 +609,33 @@ end:
 static int mxt_check_reg_init(struct mxt_data *data)
 {
 	const struct mxt_platform_data *pdata = data->pdata;
-	struct mxt_object *object;
 	struct device *dev = &data->client->dev;
-	int index = 0;
-	int i, j, config_offset, config_size;
+	int i, offset;
+	int ret;
 
 	if (!pdata->config) {
 		dev_dbg(dev, "No cfg data defined, skipping reg init\n");
 		return 0;
 	}
 
-	for (i = 0; i < data->info.object_num; i++) {
-		object = data->object_table + i;
+	for (offset = 0, i = 0; i < data->info.object_num; i++) {
+		struct mxt_object *object = &data->object_table[i];
+		size_t config_size;
 
 		if (!mxt_object_writable(object->type))
 			continue;
 
 		config_size = object->size * object->instances;
-		for (j = 0; j < config_size; j++) {
-			config_offset = index + j;
-			if (config_offset > pdata->config_length) {
-				dev_err(dev, "Not enough config data!\n");
-				return -EINVAL;
-			}
-			mxt_write_object(data, object->type, j,
-					 pdata->config[config_offset]);
+		if (offset + config_size > pdata->config_length) {
+			dev_err(dev, "Not enough config data!\n");
+			return -EINVAL;
 		}
-		index += config_size;
+
+		ret = mxt_write_reg(data->client, object->start_address,
+				    config_size, &pdata->config[offset]);
+		if (ret)
+			return ret;
+		offset += config_size;
 	}
 
 	return 0;
-- 
1.7.7.3

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