Input: tsc2005 - do not use 0 in place of NULL

Sparse in unhappy when people use 0 instead of NULL for pointers so
let's rework the way we initialize spi_transfer structure in
tsc2005_cmd() and tsc2005_write().

Tested-by: Aaro Koskinen <aaro.koskinen@nokia.com>
Signed-off-by: Dmitry Torokhov <dtor@mail.ru>

1 files changed, 16 insertions, 20 deletions

diff --git a/drivers/input/touchscreen/tsc2005.c b/drivers/input/touchscreen/tsc2005.c
index f457cb95b95b..289057e1b9a2 100644
--- a/drivers/input/touchscreen/tsc2005.c
+++ b/drivers/input/touchscreen/tsc2005.c
@@ -148,16 +148,13 @@ struct tsc2005 {
 
 static void tsc2005_cmd(struct tsc2005 *ts, u8 cmd)
 {
-        u8 tx;
+        u8 tx = TSC2005_CMD | TSC2005_CMD_12BIT | cmd;
+        struct spi_transfer xfer = {
+                .tx_buf         = &tx,
+                .len            = 1,
+                .bits_per_word  = 8,
+        };
         struct spi_message msg;
-        struct spi_transfer xfer = { 0 };
-
-        tx = TSC2005_CMD | TSC2005_CMD_12BIT | cmd;
-
-        xfer.tx_buf = &tx;
-        xfer.rx_buf = NULL;
-        xfer.len = 1;
-        xfer.bits_per_word = 8;
 
         spi_message_init(&msg);
         spi_message_add_tail(&xfer, &msg);
@@ -166,17 +163,13 @@ static void tsc2005_cmd(struct tsc2005 *ts, u8 cmd)
 
 static void tsc2005_write(struct tsc2005 *ts, u8 reg, u16 value)
 {
-        u32 tx;
+        u32 tx = ((reg | TSC2005_REG_PND0) << 16) | value;
+        struct spi_transfer xfer = {
+                .tx_buf         = &tx,
+                .len            = 4,
+                .bits_per_word  = 24,
+        };
         struct spi_message msg;
-        struct spi_transfer xfer = { 0 };
-
-        tx = (reg | TSC2005_REG_PND0) << 16;
-        tx |= value;
-
-        xfer.tx_buf = &tx;
-        xfer.rx_buf = NULL;
-        xfer.len = 4;
-        xfer.bits_per_word = 24;
 
         spi_message_init(&msg);
         spi_message_add_tail(&xfer, &msg);
@@ -185,6 +178,8 @@ static void tsc2005_write(struct tsc2005 *ts, u8 reg, u16 value)
 
 static void tsc2005_setup_read(struct tsc2005_spi_rd *rd, u8 reg, bool last)
 {
+        memset(rd, 0, sizeof(*rd));
+
         rd->spi_tx                 = (reg | TSC2005_REG_READ) << 16;
         rd->spi_xfer.tx_buf        = &rd->spi_tx;
         rd->spi_xfer.rx_buf        = &rd->spi_rx;
@@ -195,14 +190,15 @@ static void tsc2005_setup_read(struct tsc2005_spi_rd *rd, u8 reg, bool last)
 
 static void tsc2005_read(struct tsc2005 *ts, u8 reg, u16 *value)
 {
+        struct tsc2005_spi_rd spi_rd;
         struct spi_message msg;
-        struct tsc2005_spi_rd spi_rd = { { 0 }, 0, 0 };
 
         tsc2005_setup_read(&spi_rd, reg, true);
 
         spi_message_init(&msg);
         spi_message_add_tail(&spi_rd.spi_xfer, &msg);
         spi_sync(ts->spi, &msg);
+
         *value = spi_rd.spi_rx;
 }