1 files changed, 117 insertions, 0 deletions

diff --git a/include/linux/iio/sysfs.h b/include/linux/iio/sysfs.h
new file mode 100644
index 000000000000..bfedb73b850e
--- /dev/null
+++ b/include/linux/iio/sysfs.h
@@ -0,0 +1,117 @@
+/* The industrial I/O core
+ *
+ *Copyright (c) 2008 Jonathan Cameron
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 as published by
+ * the Free Software Foundation.
+ *
+ * General attributes
+ */
+
+#ifndef _INDUSTRIAL_IO_SYSFS_H_
+#define _INDUSTRIAL_IO_SYSFS_H_
+
+struct iio_chan_spec;
+
+/**
+ * struct iio_dev_attr - iio specific device attribute
+ * @dev_attr:   underlying device attribute
+ * @address:    associated register address
+ * @l:          list head for maintaining list of dynamically created attrs.
+ */
+struct iio_dev_attr {
+        struct device_attribute dev_attr;
+        u64 address;
+        struct list_head l;
+        struct iio_chan_spec const *c;
+};
+
+#define to_iio_dev_attr(_dev_attr)                              \
+        container_of(_dev_attr, struct iio_dev_attr, dev_attr)
+
+ssize_t iio_read_const_attr(struct device *dev,
+                            struct device_attribute *attr,
+                            char *len);
+
+/**
+ * struct iio_const_attr - constant device specific attribute
+ *                         often used for things like available modes
+ * @string:     attribute string
+ * @dev_attr:   underlying device attribute
+ */
+struct iio_const_attr {
+        const char *string;
+        struct device_attribute dev_attr;
+};
+
+#define to_iio_const_attr(_dev_attr) \
+        container_of(_dev_attr, struct iio_const_attr, dev_attr)
+
+/* Some attributes will be hard coded (device dependent) and not require an
+   address, in these cases pass a negative */
+#define IIO_ATTR(_name, _mode, _show, _store, _addr)            \
+        { .dev_attr = __ATTR(_name, _mode, _show, _store),      \
+          .address = _addr }
+
+#define IIO_DEVICE_ATTR(_name, _mode, _show, _store, _addr)     \
+        struct iio_dev_attr iio_dev_attr_##_name                \
+        = IIO_ATTR(_name, _mode, _show, _store, _addr)
+
+#define IIO_DEVICE_ATTR_NAMED(_vname, _name, _mode, _show, _store, _addr) \
+        struct iio_dev_attr iio_dev_attr_##_vname                       \
+        = IIO_ATTR(_name, _mode, _show, _store, _addr)
+
+#define IIO_CONST_ATTR(_name, _string)                                  \
+        struct iio_const_attr iio_const_attr_##_name                    \
+        = { .string = _string,                                          \
+            .dev_attr = __ATTR(_name, S_IRUGO, iio_read_const_attr, NULL)}
+
+#define IIO_CONST_ATTR_NAMED(_vname, _name, _string)                    \
+        struct iio_const_attr iio_const_attr_##_vname                   \
+        = { .string = _string,                                          \
+            .dev_attr = __ATTR(_name, S_IRUGO, iio_read_const_attr, NULL)}
+
+/* Generic attributes of onetype or another */
+/**
+ * IIO_DEV_ATTR_RESET: resets the device
+ **/
+#define IIO_DEV_ATTR_RESET(_store)                      \
+        IIO_DEVICE_ATTR(reset, S_IWUSR, NULL, _store, 0)
+
+/**
+ * IIO_DEV_ATTR_SAMP_FREQ - sets any internal clock frequency
+ * @_mode: sysfs file mode/permissions
+ * @_show: output method for the attribute
+ * @_store: input method for the attribute
+ **/
+#define IIO_DEV_ATTR_SAMP_FREQ(_mode, _show, _store)                    \
+        IIO_DEVICE_ATTR(sampling_frequency, _mode, _show, _store, 0)
+
+/**
+ * IIO_DEV_ATTR_SAMP_FREQ_AVAIL - list available sampling frequencies
+ * @_show: output method for the attribute
+ *
+ * May be mode dependent on some devices
+ **/
+#define IIO_DEV_ATTR_SAMP_FREQ_AVAIL(_show)                             \
+        IIO_DEVICE_ATTR(sampling_frequency_available, S_IRUGO, _show, NULL, 0)
+/**
+ * IIO_CONST_ATTR_AVAIL_SAMP_FREQ - list available sampling frequencies
+ * @_string: frequency string for the attribute
+ *
+ * Constant version
+ **/
+#define IIO_CONST_ATTR_SAMP_FREQ_AVAIL(_string)                 \
+        IIO_CONST_ATTR(sampling_frequency_available, _string)
+
+#define IIO_DEV_ATTR_TEMP_RAW(_show)                    \
+        IIO_DEVICE_ATTR(in_temp_raw, S_IRUGO, _show, NULL, 0)
+
+#define IIO_CONST_ATTR_TEMP_OFFSET(_string)             \
+        IIO_CONST_ATTR(in_temp_offset, _string)
+
+#define IIO_CONST_ATTR_TEMP_SCALE(_string)              \
+        IIO_CONST_ATTR(in_temp_scale, _string)
+
+#endif /* _INDUSTRIAL_IO_SYSFS_H_ */