iio: accel: kxsd9: Convert to use regmap for transport

This converts the KXSD9 driver to drop the custom transport
mechanism and just use regmap like everything else.

Tested-by: Jonathan Cameron <jic23@kernel.org>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Jonathan Cameron <jic23@kernel.org>

1 files changed, 17 insertions, 62 deletions

diff --git a/drivers/iio/accel/kxsd9-spi.c b/drivers/iio/accel/kxsd9-spi.c
index a49c10cd7634..c5af51b7dd7e 100644
--- a/drivers/iio/accel/kxsd9-spi.c
+++ b/drivers/iio/accel/kxsd9-spi.c
@@ -3,75 +3,30 @@
 #include <linux/spi/spi.h>
 #include <linux/module.h>
 #include <linux/slab.h>
+#include <linux/regmap.h>
 
 #include "kxsd9.h"
 
-#define KXSD9_READ(a) (0x80 | (a))
-#define KXSD9_WRITE(a) (a)
-
-static int kxsd9_spi_readreg(struct kxsd9_transport *tr, u8 address)
-{
-	struct spi_device *spi = tr->trdev;
-
-	return spi_w8r8(spi, KXSD9_READ(address));
-}
-
-static int kxsd9_spi_writereg(struct kxsd9_transport *tr, u8 address, u8 val)
-{
-	struct spi_device *spi = tr->trdev;
-
-	tr->tx[0] = KXSD9_WRITE(address),
-	tr->tx[1] = val;
-	return spi_write(spi, tr->tx, 2);
-}
-
-static int kxsd9_spi_readval(struct kxsd9_transport *tr, u8 address)
-{
-	struct spi_device *spi = tr->trdev;
-	struct spi_transfer xfers[] = {
-		{
-			.bits_per_word = 8,
-			.len = 1,
-			.delay_usecs = 200,
-			.tx_buf = tr->tx,
-		}, {
-			.bits_per_word = 8,
-			.len = 2,
-			.rx_buf = tr->rx,
-		},
-	};
-	int ret;
-
-	tr->tx[0] = KXSD9_READ(address);
-	ret = spi_sync_transfer(spi, xfers, ARRAY_SIZE(xfers));
-	if (!ret)
-		ret = (((u16)(tr->rx[0])) << 8) | (tr->rx[1]);
-	return ret;
-}
-
 static int kxsd9_spi_probe(struct spi_device *spi)
 {
-	struct kxsd9_transport *transport;
-	int ret;
-
-	transport = devm_kzalloc(&spi->dev, sizeof(*transport), GFP_KERNEL);
-	if (!transport)
-		return -ENOMEM;
+	static const struct regmap_config config = {
+		.reg_bits = 8,
+		.val_bits = 8,
+		.max_register = 0x0e,
+	};
+	struct regmap *regmap;
 
-	transport->trdev = spi;
-	transport->readreg = kxsd9_spi_readreg;
-	transport->writereg = kxsd9_spi_writereg;
-	transport->readval = kxsd9_spi_readval;
 	spi->mode = SPI_MODE_0;
-	spi_setup(spi);
-
-	ret = kxsd9_common_probe(&spi->dev,
-				 transport,
-				 spi_get_device_id(spi)->name);
-	if (ret)
-		return ret;
-
-	return 0;
+	regmap = devm_regmap_init_spi(spi, &config);
+	if (IS_ERR(regmap)) {
+		dev_err(&spi->dev, "%s: regmap allocation failed: %ld\n",
+			__func__, PTR_ERR(regmap));
+		return PTR_ERR(regmap);
+	}
+
+	return kxsd9_common_probe(&spi->dev,
+				  regmap,
+				  spi_get_device_id(spi)->name);
 }
 
 static int kxsd9_spi_remove(struct spi_device *spi)