This is called garbage in it's Kconfig entry for a reason,
but it shows how things work at the lowest possible level.
Signed-off-by: Jonathan Cameron <jic23@xxxxxxxxx>
---
drivers/staging/iio/Kconfig | 5 ++
drivers/staging/iio/Makefile | 1 +
drivers/staging/iio/iio_snoop.c | 94 +++++++++++++++++++++++++++++++++++++++
3 files changed, 100 insertions(+), 0 deletions(-)
diff --git a/drivers/staging/iio/Kconfig b/drivers/staging/iio/Kconfig
index ca139fb..f1dbc2c 100644
--- a/drivers/staging/iio/Kconfig
+++ b/drivers/staging/iio/Kconfig
@@ -12,6 +12,11 @@ menuconfig IIO
drivers/staging/iio/Documentation for more information.
if IIO
+config IIO_SNOOP
+ tristate "dubious hack driver"
+ help
+ Garbage.
+
config IIO_ST_HWMON
tristate "Hwmon driver that uses channels specified via iio maps"
depends on HWMON
diff --git a/drivers/staging/iio/Makefile b/drivers/staging/iio/Makefile
index d5ca5cf..bd639ed 100644
--- a/drivers/staging/iio/Makefile
+++ b/drivers/staging/iio/Makefile
@@ -18,6 +18,7 @@ iio_dummy-$(CONFIG_IIO_SIMPLE_DUMMY_BUFFER) += iio_simple_dummy_buffer.o
obj-$(CONFIG_IIO_DUMMY_EVGEN) += iio_dummy_evgen.o
obj-$(CONFIG_IIO_ST_HWMON) += iio_hwmon.o
+obj-$(CONFIG_IIO_SNOOP) += iio_snoop.o
obj-y += accel/
obj-y += adc/
diff --git a/drivers/staging/iio/iio_snoop.c b/drivers/staging/iio/iio_snoop.c
new file mode 100644
index 0000000..1f5abdb
--- /dev/null
+++ b/drivers/staging/iio/iio_snoop.c
@@ -0,0 +1,94 @@
+#include <linux/kernel.h>
+#include <linux/slab.h>
+#include <linux/module.h>
+#include <linux/err.h>
+#include <linux/platform_device.h>
+#include "buffer.h"
+#include "inkern.h"
+
+static int iio_snoop_store_to(struct iio_buffer *buffer, u8 *data, s64 timestamp)
+{
+ printk(" snoop %d %d\n", data[0], data[1]);
+ return 0;
+}
+
+static struct iio_buffer_access_funcs iio_snoop_access = {
+ .store_to = &iio_snoop_store_to,
+};
+
+struct iio_snoop_buffer {
+ struct iio_buffer buf;
+};
+
+struct iio_snoop_state {
+ struct iio_channel **channels;
+ struct iio_snoop_buffer buf;
+};
+
+static int __devinit iio_snoop_probe(struct platform_device *pdev)
+{
+ struct iio_snoop_state *st;
+ int ret;
+
+ printk("probing snoop\n");
+ st= kzalloc(sizeof(*st), GFP_KERNEL);
+ if (st == NULL)
+ return -ENOMEM;
+
+ st->channels = iio_st_channel_get_all(&pdev->dev, NULL);
+ if (IS_ERR(st->channels)) {
+ ret = PTR_ERR(st->channels);
+ goto error_free_state;
+ }
+
+ st->buf.buf.access = &iio_snoop_access;
+ //cheat.
+ st->buf.buf.scan_mask = kzalloc(sizeof(long)*10, GFP_KERNEL);
+ INIT_LIST_HEAD(&st->buf.buf.demux_list);
+ /* naughty ;) */
+ set_bit(3, st->buf.buf.scan_mask);
+
+ platform_set_drvdata(pdev, st);
+ printk("update bufffers\bn");
+ iio_update_buffers(st->channels[0]->indio_dev, &st->buf.buf, NULL);
+
+ return 0;
+error_free_state:
+ kfree(st);
+ return ret;
+}
+
+static int __devexit iio_snoop_remove(struct platform_device *pdev)
+{
+ struct iio_snoop_state *st = platform_get_drvdata(pdev);
+ iio_update_buffers(st->channels[0]->indio_dev, NULL, &st->buf.buf);
+ iio_st_channel_release_all(st->channels);
+
+ kfree(st);
+ return 0;
+}
+
+static struct platform_driver __refdata iio_snoop_driver = {
+ .driver = {
+ .name = "iio_snoop",
+ .owner = THIS_MODULE,
+ },
+ .probe = iio_snoop_probe,
+ .remove = __devexit_p(iio_snoop_remove),
+};
+
+static int iio_snoop_init(void)
+{
+ return platform_driver_register(&iio_snoop_driver);
+}
+module_init(iio_snoop_init);
+
+static void iio_snoop_exit(void)
+{
+ platform_driver_unregister(&iio_snoop_driver);
+}
+module_exit(iio_snoop_exit);
+
+MODULE_AUTHOR("Jonathan Cameron <jic23@xxxxxxxxx>");
+MODULE_DESCRIPTION("IIO snoop buffer driver");
+MODULE_LICENSE("GPL v2");
--
1.7.7
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