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NFC: trf7970a: Use spi_sync() instead of spi_write_then_read() 

To more efficiently handle long continuous reads,
use spi_sync() instead of spi_write_then_read().

Signed-off-by: Mark A. Greer <mgreer@animalcreek.com>
Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>
This commit is contained in:
Mark A. Greer 2014-09-02 15:12:18 -07:00 committed by Samuel Ortiz
parent 24707296c7
commit 3e7f335689
1 changed files with 16 additions and 3 deletions
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19
drivers/nfc/trf7970a.c
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@ -393,15 +393,28 @@ static int trf7970a_read(struct trf7970a *trf, u8 reg, u8 *val)
return ret;
}
static int trf7970a_read_cont(struct trf7970a *trf, u8 reg,
u8 *buf, size_t len)
static int trf7970a_read_cont(struct trf7970a *trf, u8 reg, u8 *buf, size_t len)
{
u8 addr = reg | TRF7970A_CMD_BIT_RW | TRF7970A_CMD_BIT_CONTINUOUS;
struct spi_transfer t[2];
struct spi_message m;
int ret;
dev_dbg(trf->dev, "read_cont(0x%x, %zd)\n", addr, len);
ret = spi_write_then_read(trf->spi, &addr, 1, buf, len);
spi_message_init(&m);
memset(&t, 0, sizeof(t));
t[0].tx_buf = &addr;
t[0].len = sizeof(addr);
spi_message_add_tail(&t[0], &m);
t[1].rx_buf = buf;
t[1].len = len;
spi_message_add_tail(&t[1], &m);
ret = spi_sync(trf->spi, &m);
if (ret)
dev_err(trf->dev, "%s - addr: 0x%x, ret: %d\n", __func__, addr,
ret);