From: Angelo Dureghello <adureghello@xxxxxxxxxxxx>
Extend backend features with new calls needed later on this
patchset from axi version of ad3552r.
A bus type property has been added to the devicetree to
inform the backend about the type of bus (interface) in use
bu the IP.
The follwoing calls are added:
iio_backend_ext_sync_enable
enable synchronize channels on external trigger
iio_backend_ext_sync_disable
disable synchronize channels on external trigger
iio_backend_ddr_enable
enable ddr bus transfer
iio_backend_ddr_disable
disable ddr bus transfer
iio_backend_set_bus_mode
select the type of bus, so that specific read / write
operations are performed accordingly
iio_backend_buffer_enable
enable buffer
iio_backend_buffer_disable
disable buffer
iio_backend_data_transfer_addr
define the target register address where the DAC sample
will be written.
iio_backend_bus_reg_read
generic bus read, bus-type dependent
iio_backend_bus_read_write
generic bus write, bus-type dependent
Signed-off-by: Angelo Dureghello <adureghello@xxxxxxxxxxxx>
---
drivers/iio/industrialio-backend.c | 157 +++++++++++++++++++++++++++++++++++++
include/linux/iio/backend.h | 33 ++++++++
2 files changed, 190 insertions(+)
diff --git a/drivers/iio/industrialio-backend.c b/drivers/iio/industrialio-backend.c
index 20b3b5212da7..231bef4b560e 100644
--- a/drivers/iio/industrialio-backend.c
+++ b/drivers/iio/industrialio-backend.c
@@ -718,6 +718,163 @@ static int __devm_iio_backend_get(struct device *dev, struct iio_backend *back)
return 0;
}
+/**
+ * iio_backend_ext_sync_enable - Enable external synchronization
+ * @back: Backend device
+ *
+ * Enable synchronization by external signal.
+ *
+ * RETURNS:
+ * 0 on success, negative error number on failure.
+ */
+int iio_backend_ext_sync_enable(struct iio_backend *back)
+{
+ return iio_backend_op_call(back, ext_sync_enable);
+}
+EXPORT_SYMBOL_NS_GPL(iio_backend_ext_sync_enable, IIO_BACKEND);
+
+/**
+ * iio_backend_ext_sync_disable - Disable external synchronization
+ * @back: Backend device
+ *
+ * Disable synchronization by external signal.
+ *
+ * RETURNS:
+ * 0 on success, negative error number on failure.
+ */
+int iio_backend_ext_sync_disable(struct iio_backend *back)
+{
+ return iio_backend_op_call(back, ext_sync_disable);
+}
+EXPORT_SYMBOL_NS_GPL(iio_backend_ext_sync_disable, IIO_BACKEND);
+
+/**
+ * iio_backend_ddr_enable - Enable interface DDR (Double Data Rate) mode
+ * @back: Backend device
+ *
+ * Enabling DDR, data is generated by the IP at each front
+ * (raising and falling) of the bus clock signal.
+ *
+ * RETURNS:
+ * 0 on success, negative error number on failure.
+ */
+int iio_backend_ddr_enable(struct iio_backend *back)
+{
+ return iio_backend_op_call(back, ddr_enable);
+}
+EXPORT_SYMBOL_NS_GPL(iio_backend_ddr_enable, IIO_BACKEND);
+
+/**
+ * iio_backend_ddr_disable - Disable interface DDR (Double Data Rate) mode
+ * @back: Backend device
+ *
+ * Disabling DDR data is generated byt the IP at rising or falling front
+ * of the interface clock signal (SDR, Single Data Rate).
+ *
+ * RETURNS:
+ * 0 on success, negative error number on failure.
+ */
+int iio_backend_ddr_disable(struct iio_backend *back)
+{
+ return iio_backend_op_call(back, ddr_disable);
+}
+EXPORT_SYMBOL_NS_GPL(iio_backend_ddr_disable, IIO_BACKEND);
+
+/**
+ * iio_backend_buffer_enable - Enable iio buffering
+ * @back: Backend device
+ *
+ * Enabling the buffer, buffer data is processed and sent out from the
+ * bus interface.
+ *
+ * RETURNS:
+ * 0 on success, negative error number on failure.
+ */
+int iio_backend_buffer_enable(struct iio_backend *back)
+{
+ return iio_backend_op_call(back, buffer_enable);
+}
+EXPORT_SYMBOL_NS_GPL(iio_backend_buffer_enable, IIO_BACKEND);
+
+/**
+ * iio_backend_buffer_disable - Disable iio buffering
+ * @back: Backend device
+ *
+ * Disabling the buffer, buffer data transfer on the bus interface
+ * is stopped.
+ *
+ * RETURNS:
+ * 0 on success, negative error number on failure.
+ */
+int iio_backend_buffer_disable(struct iio_backend *back)
+{
+ return iio_backend_op_call(back, buffer_disable);
+}
+EXPORT_SYMBOL_NS_GPL(iio_backend_buffer_disable, IIO_BACKEND);
+
+/**
+ * iio_backend_data_transfer_addr - Set data address.
+ * @back: Backend device
+ * @address: Data register address
+ *
+ * Some devices may need to inform the backend about an address
+ * where to read or write the data.
+ *
+ * RETURNS:
+ * 0 on success, negative error number on failure.
+ */
+int iio_backend_data_transfer_addr(struct iio_backend *back, u32 address)
+{
+ return iio_backend_op_call(back, data_transfer_addr, address);
+}
+EXPORT_SYMBOL_NS_GPL(iio_backend_data_transfer_addr, IIO_BACKEND);
+
+/**
+ * iio_backend_bus_reg_read - Read from the interface bus
+ * @back: Backend device
+ * @reg: Register valule
+ * @val: Pointer to register value
+ * @data_size: Transfer data size in bytes
+ *
+ * A backend may operate on a specific interface with a related bus.
+ * Read from the interface bus.
+ *
+ * RETURNS:
+ * 0 on success, negative error number on failure.
+ */
+int iio_backend_bus_reg_read(struct iio_backend *back, u32 reg,
+ unsigned int *val, size_t data_size)
+{
+ if (!data_size)
+ return -EINVAL;
+
+ return iio_backend_op_call(back, bus_reg_read, reg, val, data_size);
+}
+EXPORT_SYMBOL_NS_GPL(iio_backend_bus_reg_read, IIO_BACKEND);
+
+/**
+ * iio_backend_bus_reg_write - Write on the interface bus
+ * @back: Backend device
+ * @reg: Register value
+ * @val: Register Value
+ * @data_size: Transfer data size in bytes
+ *
+ * A backend may operate on a specific interface with a related bus.
+ * Write to the interface bus.
+ *
+ * RETURNS:
+ * 0 on success, negative error number on failure.
+ */
+int iio_backend_bus_reg_write(struct iio_backend *back, u32 reg,
+ unsigned int val, size_t data_size)
+{
+ if (!data_size)
+ return -EINVAL;
+
+ return iio_backend_op_call(back, bus_reg_write, reg, val, data_size);
+}
+EXPORT_SYMBOL_NS_GPL(iio_backend_bus_reg_write, IIO_BACKEND);
+
static struct iio_backend *__devm_iio_backend_fwnode_get(struct device *dev, const char *name,
struct fwnode_handle *fwnode)
{
diff --git a/include/linux/iio/backend.h b/include/linux/iio/backend.h
index 37d56914d485..eb8c5bb74bb5 100644
--- a/include/linux/iio/backend.h
+++ b/include/linux/iio/backend.h
@@ -14,12 +14,14 @@ struct iio_dev;
enum iio_backend_data_type {
IIO_BACKEND_TWOS_COMPLEMENT,
IIO_BACKEND_OFFSET_BINARY,
+ IIO_BACKEND_DATA_UNSIGNED,
IIO_BACKEND_DATA_TYPE_MAX
};
enum iio_backend_data_source {
IIO_BACKEND_INTERNAL_CONTINUOUS_WAVE,
IIO_BACKEND_EXTERNAL,
+ IIO_BACKEND_INTERNAL_RAMP_16,
IIO_BACKEND_DATA_SOURCE_MAX
};
@@ -89,6 +91,15 @@ enum iio_backend_sample_trigger {
* @read_raw: Read a channel attribute from a backend device
* @debugfs_print_chan_status: Print channel status into a buffer.
* @debugfs_reg_access: Read or write register value of backend.
+ * @ext_sync_enable: Enable external synchronization.
+ * @ext_sync_disable: Disable external synchronization.
+ * @ddr_enable: Enable interface DDR (Double Data Rate) mode.
+ * @ddr_disable: Disable interface DDR (Double Data Rate) mode.
+ * @buffer_enable: Enable data buffer.
+ * @buffer_disable: Disable data buffer.
+ * @data_transfer_addr: Set data address.
+ * @bus_reg_read: Read from the interface bus.
+ * @bus_reg_write: Write on the interface bus.
**/
struct iio_backend_ops {
int (*enable)(struct iio_backend *back);
@@ -129,6 +140,17 @@ struct iio_backend_ops {
size_t len);
int (*debugfs_reg_access)(struct iio_backend *back, unsigned int reg,
unsigned int writeval, unsigned int *readval);
+ int (*ext_sync_enable)(struct iio_backend *back);
+ int (*ext_sync_disable)(struct iio_backend *back);
+ int (*ddr_enable)(struct iio_backend *back);
+ int (*ddr_disable)(struct iio_backend *back);
+ int (*buffer_enable)(struct iio_backend *back);
+ int (*buffer_disable)(struct iio_backend *back);
+ int (*data_transfer_addr)(struct iio_backend *back, u32 address);
+ int (*bus_reg_read)(struct iio_backend *back, u32 reg,
+ unsigned int *val, size_t data_size);
+ int (*bus_reg_write)(struct iio_backend *back, u32 reg,
+ unsigned int val, size_t data_size);
};
/**
@@ -164,6 +186,17 @@ int iio_backend_data_sample_trigger(struct iio_backend *back,
int devm_iio_backend_request_buffer(struct device *dev,
struct iio_backend *back,
struct iio_dev *indio_dev);
+int iio_backend_ext_sync_enable(struct iio_backend *back);
+int iio_backend_ext_sync_disable(struct iio_backend *back);
+int iio_backend_ddr_enable(struct iio_backend *back);
+int iio_backend_ddr_disable(struct iio_backend *back);
+int iio_backend_buffer_enable(struct iio_backend *back);
+int iio_backend_buffer_disable(struct iio_backend *back);
+int iio_backend_data_transfer_addr(struct iio_backend *back, u32 address);
+int iio_backend_bus_reg_read(struct iio_backend *back, u32 reg,
+ unsigned int *val, size_t data_size);
+int iio_backend_bus_reg_write(struct iio_backend *back, u32 reg,
+ unsigned int val, size_t data_size);
ssize_t iio_backend_ext_info_set(struct iio_dev *indio_dev, uintptr_t private,
const struct iio_chan_spec *chan,
const char *buf, size_t len);
--
2.45.0.rc1
