linux-kernel - [PATCH 1/2] i2c: xgene-slimpro: Use a single function to send command message

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Date:   Tue, 28 Mar 2017 13:46:16 -0700
From:   Hoan Tran <hotran@....com>
To:     Wolfram Sang <wsa@...-dreams.de>
Cc:     linux-i2c@...r.kernel.org, linux-kernel@...r.kernel.org,
        Loc Ho <lho@....com>, Keyur Chudgar <kchudgar@....com>,
        Hoan Tran <hotran@....com>
Subject: [PATCH 1/2] i2c: xgene-slimpro: Use a single function to send command message

This patch refactors the code to use a single message function to
send command message.

Signed-off-by: Hoan Tran <hotran@....com>
---
 drivers/i2c/busses/i2c-xgene-slimpro.c | 67 +++++++++++++---------------------
 1 file changed, 26 insertions(+), 41 deletions(-)

diff --git a/drivers/i2c/busses/i2c-xgene-slimpro.c b/drivers/i2c/busses/i2c-xgene-slimpro.c
index dbe7e44..96545aa 100644
--- a/drivers/i2c/busses/i2c-xgene-slimpro.c
+++ b/drivers/i2c/busses/i2c-xgene-slimpro.c
@@ -144,49 +144,52 @@ static int start_i2c_msg_xfer(struct slimpro_i2c_dev *ctx)
 	return 0;
 }
 
-static int slimpro_i2c_rd(struct slimpro_i2c_dev *ctx, u32 chip,
-			  u32 addr, u32 addrlen, u32 protocol,
-			  u32 readlen, u32 *data)
+static int slimpro_i2c_send_msg(struct slimpro_i2c_dev *ctx,
+				u32 *msg,
+				u32 *data)
 {
-	u32 msg[3];
 	int rc;
 
-	msg[0] = SLIMPRO_IIC_ENCODE_MSG(SLIMPRO_IIC_BUS, chip,
-					SLIMPRO_IIC_READ, protocol, addrlen, readlen);
-	msg[1] = SLIMPRO_IIC_ENCODE_ADDR(addr);
-	msg[2] = 0;
 	ctx->resp_msg = data;
-	rc = mbox_send_message(ctx->mbox_chan, &msg);
+
+	rc = mbox_send_message(ctx->mbox_chan, msg);
 	if (rc < 0)
 		goto err;
 
 	rc = start_i2c_msg_xfer(ctx);
+
 err:
 	ctx->resp_msg = NULL;
+
 	return rc;
 }
 
+static int slimpro_i2c_rd(struct slimpro_i2c_dev *ctx, u32 chip,
+			  u32 addr, u32 addrlen, u32 protocol,
+			  u32 readlen, u32 *data)
+{
+	u32 msg[3];
+
+	msg[0] = SLIMPRO_IIC_ENCODE_MSG(SLIMPRO_IIC_BUS, chip,
+					SLIMPRO_IIC_READ, protocol, addrlen, readlen);
+	msg[1] = SLIMPRO_IIC_ENCODE_ADDR(addr);
+	msg[2] = 0;
+
+	return slimpro_i2c_send_msg(ctx, msg, data);
+}
+
 static int slimpro_i2c_wr(struct slimpro_i2c_dev *ctx, u32 chip,
 			  u32 addr, u32 addrlen, u32 protocol, u32 writelen,
 			  u32 data)
 {
 	u32 msg[3];
-	int rc;
 
 	msg[0] = SLIMPRO_IIC_ENCODE_MSG(SLIMPRO_IIC_BUS, chip,
 					SLIMPRO_IIC_WRITE, protocol, addrlen, writelen);
 	msg[1] = SLIMPRO_IIC_ENCODE_ADDR(addr);
 	msg[2] = data;
-	ctx->resp_msg = msg;
-
-	rc = mbox_send_message(ctx->mbox_chan, &msg);
-	if (rc < 0)
-		goto err;
 
-	rc = start_i2c_msg_xfer(ctx);
-err:
-	ctx->resp_msg = NULL;
-	return rc;
+	return slimpro_i2c_send_msg(ctx, msg, msg);
 }
 
 static int slimpro_i2c_blkrd(struct slimpro_i2c_dev *ctx, u32 chip, u32 addr,
@@ -201,8 +204,7 @@ static int slimpro_i2c_blkrd(struct slimpro_i2c_dev *ctx, u32 chip, u32 addr,
 	if (dma_mapping_error(ctx->dev, paddr)) {
 		dev_err(&ctx->adapter.dev, "Error in mapping dma buffer %p\n",
 			ctx->dma_buffer);
-		rc = -ENOMEM;
-		goto err;
+		return -ENOMEM;
 	}
 
 	msg[0] = SLIMPRO_IIC_ENCODE_MSG(SLIMPRO_IIC_BUS, chip, SLIMPRO_IIC_READ,
@@ -212,21 +214,13 @@ static int slimpro_i2c_blkrd(struct slimpro_i2c_dev *ctx, u32 chip, u32 addr,
 		 SLIMPRO_IIC_ENCODE_UPPER_BUFADDR(paddr) |
 		 SLIMPRO_IIC_ENCODE_ADDR(addr);
 	msg[2] = (u32)paddr;
-	ctx->resp_msg = msg;
 
-	rc = mbox_send_message(ctx->mbox_chan, &msg);
-	if (rc < 0)
-		goto err_unmap;
-
-	rc = start_i2c_msg_xfer(ctx);
+	rc = slimpro_i2c_send_msg(ctx, msg, msg);
 
 	/* Copy to destination */
 	memcpy(data, ctx->dma_buffer, readlen);
 
-err_unmap:
 	dma_unmap_single(ctx->dev, paddr, readlen, DMA_FROM_DEVICE);
-err:
-	ctx->resp_msg = NULL;
 	return rc;
 }
 
@@ -244,8 +238,7 @@ static int slimpro_i2c_blkwr(struct slimpro_i2c_dev *ctx, u32 chip,
 	if (dma_mapping_error(ctx->dev, paddr)) {
 		dev_err(&ctx->adapter.dev, "Error in mapping dma buffer %p\n",
 			ctx->dma_buffer);
-		rc = -ENOMEM;
-		goto err;
+		return -ENOMEM;
 	}
 
 	msg[0] = SLIMPRO_IIC_ENCODE_MSG(SLIMPRO_IIC_BUS, chip, SLIMPRO_IIC_WRITE,
@@ -254,21 +247,13 @@ static int slimpro_i2c_blkwr(struct slimpro_i2c_dev *ctx, u32 chip,
 		 SLIMPRO_IIC_ENCODE_UPPER_BUFADDR(paddr) |
 		 SLIMPRO_IIC_ENCODE_ADDR(addr);
 	msg[2] = (u32)paddr;
-	ctx->resp_msg = msg;
 
 	if (ctx->mbox_client.tx_block)
 		reinit_completion(&ctx->rd_complete);
 
-	rc = mbox_send_message(ctx->mbox_chan, &msg);
-	if (rc < 0)
-		goto err_unmap;
-
-	rc = start_i2c_msg_xfer(ctx);
+	rc = slimpro_i2c_send_msg(ctx, msg, msg);
 
-err_unmap:
 	dma_unmap_single(ctx->dev, paddr, writelen, DMA_TO_DEVICE);
-err:
-	ctx->resp_msg = NULL;
 	return rc;
 }
 
-- 
1.9.1