1 files changed, 172 insertions, 0 deletions

diff --git a/drivers/misc/ad525x_dpot-spi.c b/drivers/misc/ad525x_dpot-spi.c
new file mode 100644
index 000000000000..b8c6df9c8437
--- /dev/null
+++ b/drivers/misc/ad525x_dpot-spi.c
@@ -0,0 +1,172 @@
+/*
+ * Driver for the Analog Devices digital potentiometers (SPI bus)
+ *
+ * Copyright (C) 2010 Michael Hennerich, Analog Devices Inc.
+ *
+ * Licensed under the GPL-2 or later.
+ */
+
+#include <linux/spi/spi.h>
+#include <linux/module.h>
+
+#include "ad525x_dpot.h"
+
+static const struct ad_dpot_id ad_dpot_spi_devlist[] = {
+        {.name = "ad5160", .devid = AD5160_ID},
+        {.name = "ad5161", .devid = AD5161_ID},
+        {.name = "ad5162", .devid = AD5162_ID},
+        {.name = "ad5165", .devid = AD5165_ID},
+        {.name = "ad5200", .devid = AD5200_ID},
+        {.name = "ad5201", .devid = AD5201_ID},
+        {.name = "ad5203", .devid = AD5203_ID},
+        {.name = "ad5204", .devid = AD5204_ID},
+        {.name = "ad5206", .devid = AD5206_ID},
+        {.name = "ad5207", .devid = AD5207_ID},
+        {.name = "ad5231", .devid = AD5231_ID},
+        {.name = "ad5232", .devid = AD5232_ID},
+        {.name = "ad5233", .devid = AD5233_ID},
+        {.name = "ad5235", .devid = AD5235_ID},
+        {.name = "ad5260", .devid = AD5260_ID},
+        {.name = "ad5262", .devid = AD5262_ID},
+        {.name = "ad5263", .devid = AD5263_ID},
+        {.name = "ad5290", .devid = AD5290_ID},
+        {.name = "ad5291", .devid = AD5291_ID},
+        {.name = "ad5292", .devid = AD5292_ID},
+        {.name = "ad5293", .devid = AD5293_ID},
+        {.name = "ad7376", .devid = AD7376_ID},
+        {.name = "ad8400", .devid = AD8400_ID},
+        {.name = "ad8402", .devid = AD8402_ID},
+        {.name = "ad8403", .devid = AD8403_ID},
+        {.name = "adn2850", .devid = ADN2850_ID},
+        {}
+};
+
+/* ------------------------------------------------------------------------- */
+
+/* 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, 1);
+}
+
+static int write24(void *client, u8 reg, u16 val)
+{
+        u8 data[3] = {reg, val >> 8, val};
+        return spi_write(client, data, 1);
+}
+
+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 const struct ad_dpot_id *dpot_match_id(const struct ad_dpot_id *id,
+                                                char *name)
+{
+        while (id->name && id->name[0]) {
+                if (strcmp(name, id->name) == 0)
+                        return id;
+                id++;
+        }
+        return NULL;
+}
+
+static int __devinit ad_dpot_spi_probe(struct spi_device *spi)
+{
+        char *name = spi->dev.platform_data;
+        const struct ad_dpot_id *dpot_id;
+
+        struct ad_dpot_bus_data bdata = {
+                .client = spi,
+                .bops = &bops,
+        };
+
+        dpot_id = dpot_match_id(ad_dpot_spi_devlist, name);
+
+        if (dpot_id == NULL) {
+                dev_err(&spi->dev, "%s not in supported device list", name);
+                return -ENODEV;
+        }
+
+        return ad_dpot_probe(&spi->dev, &bdata, dpot_id);
+}
+
+static int __devexit ad_dpot_spi_remove(struct spi_device *spi)
+{
+        return ad_dpot_remove(&spi->dev);
+}
+
+static struct spi_driver ad_dpot_spi_driver = {
+        .driver = {
+                .name   = "ad_dpot",
+                .bus    = &spi_bus_type,
+                .owner  = THIS_MODULE,
+        },
+        .probe          = ad_dpot_spi_probe,
+        .remove         = __devexit_p(ad_dpot_spi_remove),
+};
+
+static int __init ad_dpot_spi_init(void)
+{
+        return spi_register_driver(&ad_dpot_spi_driver);
+}
+module_init(ad_dpot_spi_init);
+
+static void __exit ad_dpot_spi_exit(void)
+{
+        spi_unregister_driver(&ad_dpot_spi_driver);
+}
+module_exit(ad_dpot_spi_exit);
+
+MODULE_AUTHOR("Michael Hennerich <hennerich@blackfin.uclinux.org>");
+MODULE_DESCRIPTION("digital potentiometer SPI bus driver");
+MODULE_LICENSE("GPL");
+MODULE_ALIAS("spi:ad_dpot");