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Diffstat (limited to 'drivers/misc/ad525x_dpot-spi.c')
-rw-r--r--drivers/misc/ad525x_dpot-spi.c145
1 files changed, 145 insertions, 0 deletions
diff --git a/drivers/misc/ad525x_dpot-spi.c b/drivers/misc/ad525x_dpot-spi.c
new file mode 100644
index 000000000..aea931dd2
--- /dev/null
+++ b/drivers/misc/ad525x_dpot-spi.c
@@ -0,0 +1,145 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * Driver for the Analog Devices digital potentiometers (SPI bus)
+ *
+ * Copyright (C) 2010-2011 Michael Hennerich, Analog Devices Inc.
+ */
+
+#include <linux/spi/spi.h>
+#include <linux/module.h>
+
+#include "ad525x_dpot.h"
+
+/* SPI bus functions */
+static int write8(void *client, u8 val)
+{
+ u8 data = val;
+
+ return spi_write(client, &data, 1);
+}
+
+static int write16(void *client, u8 reg, u8 val)
+{
+ u8 data[2] = {reg, val};
+
+ return spi_write(client, data, 2);
+}
+
+static int write24(void *client, u8 reg, u16 val)
+{
+ u8 data[3] = {reg, val >> 8, val};
+
+ return spi_write(client, data, 3);
+}
+
+static int read8(void *client)
+{
+ int ret;
+ u8 data;
+
+ ret = spi_read(client, &data, 1);
+ if (ret < 0)
+ return ret;
+
+ return data;
+}
+
+static int read16(void *client, u8 reg)
+{
+ int ret;
+ u8 buf_rx[2];
+
+ write16(client, reg, 0);
+ ret = spi_read(client, buf_rx, 2);
+ if (ret < 0)
+ return ret;
+
+ return (buf_rx[0] << 8) | buf_rx[1];
+}
+
+static int read24(void *client, u8 reg)
+{
+ int ret;
+ u8 buf_rx[3];
+
+ write24(client, reg, 0);
+ ret = spi_read(client, buf_rx, 3);
+ if (ret < 0)
+ return ret;
+
+ return (buf_rx[1] << 8) | buf_rx[2];
+}
+
+static const struct ad_dpot_bus_ops bops = {
+ .read_d8 = read8,
+ .read_r8d8 = read16,
+ .read_r8d16 = read24,
+ .write_d8 = write8,
+ .write_r8d8 = write16,
+ .write_r8d16 = write24,
+};
+static int ad_dpot_spi_probe(struct spi_device *spi)
+{
+ struct ad_dpot_bus_data bdata = {
+ .client = spi,
+ .bops = &bops,
+ };
+
+ return ad_dpot_probe(&spi->dev, &bdata,
+ spi_get_device_id(spi)->driver_data,
+ spi_get_device_id(spi)->name);
+}
+
+static int ad_dpot_spi_remove(struct spi_device *spi)
+{
+ return ad_dpot_remove(&spi->dev);
+}
+
+static const struct spi_device_id ad_dpot_spi_id[] = {
+ {"ad5160", AD5160_ID},
+ {"ad5161", AD5161_ID},
+ {"ad5162", AD5162_ID},
+ {"ad5165", AD5165_ID},
+ {"ad5200", AD5200_ID},
+ {"ad5201", AD5201_ID},
+ {"ad5203", AD5203_ID},
+ {"ad5204", AD5204_ID},
+ {"ad5206", AD5206_ID},
+ {"ad5207", AD5207_ID},
+ {"ad5231", AD5231_ID},
+ {"ad5232", AD5232_ID},
+ {"ad5233", AD5233_ID},
+ {"ad5235", AD5235_ID},
+ {"ad5260", AD5260_ID},
+ {"ad5262", AD5262_ID},
+ {"ad5263", AD5263_ID},
+ {"ad5290", AD5290_ID},
+ {"ad5291", AD5291_ID},
+ {"ad5292", AD5292_ID},
+ {"ad5293", AD5293_ID},
+ {"ad7376", AD7376_ID},
+ {"ad8400", AD8400_ID},
+ {"ad8402", AD8402_ID},
+ {"ad8403", AD8403_ID},
+ {"adn2850", ADN2850_ID},
+ {"ad5270", AD5270_ID},
+ {"ad5271", AD5271_ID},
+ {}
+};
+MODULE_DEVICE_TABLE(spi, ad_dpot_spi_id);
+
+static struct spi_driver ad_dpot_spi_driver = {
+ .driver = {
+ .name = "ad_dpot",
+ },
+ .probe = ad_dpot_spi_probe,
+ .remove = ad_dpot_spi_remove,
+ .id_table = ad_dpot_spi_id,
+};
+
+module_spi_driver(ad_dpot_spi_driver);
+
+MODULE_AUTHOR("Michael Hennerich <michael.hennerich@analog.com>");
+MODULE_DESCRIPTION("digital potentiometer SPI bus driver");
+MODULE_LICENSE("GPL");
+MODULE_ALIAS("spi:ad_dpot");