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authorDmitry Torokhov <dmitry.torokhov@gmail.com>2011-03-16 22:10:52 -0700
committerDmitry Torokhov <dmitry.torokhov@gmail.com>2011-03-16 23:29:08 -0700
commit9a6e180af78247e3a7680460240bb450c39d3a5b (patch)
tree5ab415c2795f9974b515c94220986f055dd7fadc /drivers/input
parentc8b6846a7559e64d7ac4ba1ccdba05f3ee2e34e8 (diff)
downloadlinux-9a6e180af78247e3a7680460240bb450c39d3a5b.tar.bz2
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>
Diffstat (limited to 'drivers/input')
-rw-r--r--drivers/input/touchscreen/tsc2005.c36
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;
}