1 files changed, 74 insertions, 74 deletions

diff --git a/drivers/iio/common/st_sensors/st_sensors_spi.c b/drivers/iio/common/st_sensors/st_sensors_spi.c
index 2213843f02cb..2262f81b07c2 100644
--- a/drivers/iio/common/st_sensors/st_sensors_spi.c
+++ b/drivers/iio/common/st_sensors/st_sensors_spi.c
@@ -11,108 +11,108 @@
 #include <linux/module.h>
 #include <linux/slab.h>
 #include <linux/iio/iio.h>
+#include <linux/regmap.h>
 
 #include <linux/iio/common/st_sensors_spi.h>
-
+#include "st_sensors_core.h"
 
 #define ST_SENSORS_SPI_MULTIREAD	0xc0
-#define ST_SENSORS_SPI_READ		0x80
 
-static unsigned int st_sensors_spi_get_irq(struct iio_dev *indio_dev)
-{
-	struct st_sensor_data *sdata = iio_priv(indio_dev);
+static const struct regmap_config st_sensors_spi_regmap_config = {
+	.reg_bits = 8,
+	.val_bits = 8,
+};
 
-	return to_spi_device(sdata->dev)->irq;
-}
+static const struct regmap_config st_sensors_spi_regmap_multiread_bit_config = {
+	.reg_bits = 8,
+	.val_bits = 8,
+	.read_flag_mask = ST_SENSORS_SPI_MULTIREAD,
+};
 
-static int st_sensors_spi_read(struct st_sensor_transfer_buffer *tb,
-	struct device *dev, u8 reg_addr, int len, u8 *data, bool multiread_bit)
+/*
+ * st_sensors_is_spi_3_wire() - check if SPI 3-wire mode has been selected
+ * @spi: spi device reference.
+ *
+ * Return: true if SPI 3-wire mode is selected, false otherwise.
+ */
+static bool st_sensors_is_spi_3_wire(struct spi_device *spi)
 {
-	int err;
-
-	struct spi_transfer xfers[] = {
-		{
-			.tx_buf = tb->tx_buf,
-			.bits_per_word = 8,
-			.len = 1,
-		},
-		{
-			.rx_buf = tb->rx_buf,
-			.bits_per_word = 8,
-			.len = len,
-		}
-	};
-
-	mutex_lock(&tb->buf_lock);
-	if ((multiread_bit) && (len > 1))
-		tb->tx_buf[0] = reg_addr | ST_SENSORS_SPI_MULTIREAD;
-	else
-		tb->tx_buf[0] = reg_addr | ST_SENSORS_SPI_READ;
+	struct device_node *np = spi->dev.of_node;
+	struct st_sensors_platform_data *pdata;
 
-	err = spi_sync_transfer(to_spi_device(dev), xfers, ARRAY_SIZE(xfers));
-	if (err)
-		goto acc_spi_read_error;
+	pdata = (struct st_sensors_platform_data *)spi->dev.platform_data;
+	if ((np && of_property_read_bool(np, "spi-3wire")) ||
+	    (pdata && pdata->spi_3wire)) {
+		return true;
+	}
 
-	memcpy(data, tb->rx_buf, len);
-	mutex_unlock(&tb->buf_lock);
-	return len;
-
-acc_spi_read_error:
-	mutex_unlock(&tb->buf_lock);
-	return err;
+	return false;
 }
 
-static int st_sensors_spi_read_byte(struct st_sensor_transfer_buffer *tb,
-				struct device *dev, u8 reg_addr, u8 *res_byte)
+/*
+ * st_sensors_configure_spi_3_wire() - configure SPI 3-wire if needed
+ * @spi: spi device reference.
+ * @settings: sensor specific settings reference.
+ *
+ * Return: 0 on success, else a negative error code.
+ */
+static int st_sensors_configure_spi_3_wire(struct spi_device *spi,
+					   struct st_sensor_settings *settings)
 {
-	return st_sensors_spi_read(tb, dev, reg_addr, 1, res_byte, false);
-}
+	if (settings->sim.addr) {
+		u8 buffer[] = {
+			settings->sim.addr,
+			settings->sim.value
+		};
 
-static int st_sensors_spi_read_multiple_byte(
-	struct st_sensor_transfer_buffer *tb, struct device *dev,
-			u8 reg_addr, int len, u8 *data, bool multiread_bit)
-{
-	return st_sensors_spi_read(tb, dev, reg_addr, len, data, multiread_bit);
+		return spi_write(spi, buffer, 2);
+	}
+
+	return 0;
 }
 
-static int st_sensors_spi_write_byte(struct st_sensor_transfer_buffer *tb,
-				struct device *dev, u8 reg_addr, u8 data)
+/*
+ * st_sensors_spi_configure() - configure SPI interface
+ * @indio_dev: IIO device reference.
+ * @spi: spi device reference.
+ *
+ * Return: 0 on success, else a negative error code.
+ */
+int st_sensors_spi_configure(struct iio_dev *indio_dev,
+			     struct spi_device *spi)
 {
+	struct st_sensor_data *sdata = iio_priv(indio_dev);
+	const struct regmap_config *config;
 	int err;
 
-	struct spi_transfer xfers = {
-		.tx_buf = tb->tx_buf,
-		.bits_per_word = 8,
-		.len = 2,
-	};
+	if (st_sensors_is_spi_3_wire(spi)) {
+		err = st_sensors_configure_spi_3_wire(spi,
+						      sdata->sensor_settings);
+		if (err < 0)
+			return err;
+	}
 
-	mutex_lock(&tb->buf_lock);
-	tb->tx_buf[0] = reg_addr;
-	tb->tx_buf[1] = data;
-
-	err = spi_sync_transfer(to_spi_device(dev), &xfers, 1);
-	mutex_unlock(&tb->buf_lock);
+	if (sdata->sensor_settings->multi_read_bit)
+		config = &st_sensors_spi_regmap_multiread_bit_config;
+	else
+		config = &st_sensors_spi_regmap_config;
 
-	return err;
-}
+	sdata->regmap = devm_regmap_init_spi(spi, config);
+	if (IS_ERR(sdata->regmap)) {
+		dev_err(&spi->dev, "Failed to register spi regmap (%d)\n",
+			(int)PTR_ERR(sdata->regmap));
+		return PTR_ERR(sdata->regmap);
+	}
 
-static const struct st_sensor_transfer_function st_sensors_tf_spi = {
-	.read_byte = st_sensors_spi_read_byte,
-	.write_byte = st_sensors_spi_write_byte,
-	.read_multiple_byte = st_sensors_spi_read_multiple_byte,
-};
-
-void st_sensors_spi_configure(struct iio_dev *indio_dev,
-			struct spi_device *spi, struct st_sensor_data *sdata)
-{
 	spi_set_drvdata(spi, indio_dev);
 
 	indio_dev->dev.parent = &spi->dev;
 	indio_dev->name = spi->modalias;
 
 	sdata->dev = &spi->dev;
-	sdata->tf = &st_sensors_tf_spi;
-	sdata->get_irq_data_ready = st_sensors_spi_get_irq;
+	sdata->irq = spi->irq;
+
+	return 0;
 }
 EXPORT_SYMBOL(st_sensors_spi_configure);