1 // SPDX-License-Identifier: GPL-2.0-only
11  *                                           -------------------------------------------------------
12  * ------------------                        | ------------         ------------      -------  FPGA|
13  * |     ADC        |------------------------| | ADC CORE |---------| DMA CORE |------| RAM |      |
14  * | (Frontend/IIO) | Serial Data (eg: LVDS) | |(backend) |---------|          |------|     |      |
15  * |                |------------------------| ------------         ------------      -------      |
16  * ------------------                        -------------------------------------------------------
19  *   - Backends should register themselves with devm_iio_backend_register()
20  *   - Frontend devices should get backends with devm_iio_backend_get()
27  * the industrialio-backend.c is only left with the really generic stuff. Then,
30  * Copyright (C) 2023-2024 Analog Devices Inc.
32 #define dev_fmt(fmt) "iio-backend: " fmt
86 	if (!____back->ops->op)						\
87 		____ret = -EOPNOTSUPP;					\
98 		__ret = __back->ops->op(__back, ##args);	\
112 		ptr_err = __back->ops->op(__back, ##args);	\
123 		__back->ops->op(__back, ##args);		\
125 		dev_dbg(__back->dev, "Op(%s) not implemented\n",\
133 	struct iio_backend *back = file->private_data;  in iio_backend_debugfs_read_reg()
139 				  back->cached_reg_addr, 0, &val);  in iio_backend_debugfs_read_reg()
152 	struct iio_backend *back = file->private_data;  in iio_backend_debugfs_write_reg()
162 	ret = sscanf(buf, "%i %i", &back->cached_reg_addr, &val);  in iio_backend_debugfs_write_reg()
169 					  back->cached_reg_addr, val, NULL);  in iio_backend_debugfs_write_reg()
174 		return -EINVAL;  in iio_backend_debugfs_write_reg()
188 	struct iio_backend *back = file->private_data;  in iio_backend_debugfs_read_name()
192 	len = scnprintf(name, sizeof(name), "%s\n", back->name);  in iio_backend_debugfs_read_name()
203  * iio_backend_debugfs_add - Add debugfs interfaces for Backends
216 	if (!back->ops->debugfs_reg_access && !back->name)  in iio_backend_debugfs_add()
219 	snprintf(name, sizeof(name), "backend%d", back->idx);  in iio_backend_debugfs_add()
225 	if (back->ops->debugfs_reg_access)  in iio_backend_debugfs_add()
229 	if (back->name)  in iio_backend_debugfs_add()
236  * iio_backend_debugfs_print_chan_status - Print channel status
254 		return -ENODEV;  in iio_backend_debugfs_print_chan_status()
262  * iio_backend_chan_enable - Enable a backend channel
276  * iio_backend_chan_disable - Disable a backend channel
295  * iio_backend_disable - Backend disable
305  * iio_backend_enable - Backend enable
318  * devm_iio_backend_enable - Device managed backend enable
338  * iio_backend_data_format_set - Configure the channel data format
352 	if (!data || data->type >= IIO_BACKEND_DATA_TYPE_MAX)  in iio_backend_data_format_set()
353 		return -EINVAL;  in iio_backend_data_format_set()
360  * iio_backend_data_source_set - Select data source
365  * A given backend may have different sources to stream/sync data. This allows
375 		return -EINVAL;  in iio_backend_data_source_set()
382  * iio_backend_set_sampling_freq - Set channel sampling rate
398  * iio_backend_test_pattern_set - Configure a test pattern
414 		return -EINVAL;  in iio_backend_test_pattern_set()
421  * iio_backend_chan_status - Get the channel status
440  * iio_backend_iodelay_set - Set digital I/O delay
463  * iio_backend_data_sample_trigger - Control when to sample data
477 		return -EINVAL;  in iio_backend_data_sample_trigger()
487 	iio_backend_void_op_call(pair->back, free_buffer, pair->buffer);  in iio_backend_free_buffer()
491  * devm_iio_backend_request_buffer - Device managed buffer request
514 		return -ENOMEM;  in devm_iio_backend_request_buffer()
521 	pair->back = back;  in devm_iio_backend_request_buffer()
522 	pair->buffer = buffer;  in devm_iio_backend_request_buffer()
529  * iio_backend_read_raw - Read a channel attribute from a backend device.
549 	struct iio_backend *back = ERR_PTR(-ENODEV), *iter;  in iio_backend_from_indio_dev_parent()
560 		if (dev == iter->frontend_dev) {  in iio_backend_from_indio_dev_parent()
564 				return ERR_PTR(-ENODEV);  in iio_backend_from_indio_dev_parent()
575  * iio_backend_ext_info_get - IIO ext_info read callback
601 	back = iio_backend_from_indio_dev_parent(indio_dev->dev.parent);  in iio_backend_ext_info_get()
610  * iio_backend_ext_info_set - IIO ext_info write callback
631 	back = iio_backend_from_indio_dev_parent(indio_dev->dev.parent);  in iio_backend_ext_info_set()
640  * iio_backend_extend_chan_spec - Extend an IIO channel
653 	const struct iio_chan_spec_ext_info *frontend_ext_info = chan->ext_info;  in iio_backend_extend_chan_spec()
665 	if (frontend_ext_info && chan->ext_info != frontend_ext_info)  in iio_backend_extend_chan_spec()
666 		return -EOPNOTSUPP;  in iio_backend_extend_chan_spec()
667 	if (!chan->ext_info)  in iio_backend_extend_chan_spec()
671 	for (back_ext_info = chan->ext_info; back_ext_info->name; back_ext_info++) {  in iio_backend_extend_chan_spec()
672 		if (back_ext_info->read != iio_backend_ext_info_get)  in iio_backend_extend_chan_spec()
673 			return -EINVAL;  in iio_backend_extend_chan_spec()
674 		if (back_ext_info->write != iio_backend_ext_info_set)  in iio_backend_extend_chan_spec()
675 			return -EINVAL;  in iio_backend_extend_chan_spec()
686 	module_put(back->owner);  in iio_backend_release()
691 	struct device_link *link;  in __devm_iio_backend_get()  local
700 	if (!try_module_get(back->owner))  in __devm_iio_backend_get()
701 		return dev_err_probe(dev, -ENODEV,  in __devm_iio_backend_get()
708 	link = device_link_add(dev, back->dev, DL_FLAG_AUTOREMOVE_CONSUMER);  in __devm_iio_backend_get()
709 	if (!link)  in __devm_iio_backend_get()
710 		return dev_err_probe(dev, -EINVAL,  in __devm_iio_backend_get()
711 				     "Could not link to supplier(%s)\n",  in __devm_iio_backend_get()
712 				     dev_name(back->dev));  in __devm_iio_backend_get()
714 	back->frontend_dev = dev;  in __devm_iio_backend_get()
716 	dev_dbg(dev, "Found backend(%s) device\n", dev_name(back->dev));  in __devm_iio_backend_get()
722  * iio_backend_ddr_enable - Enable interface DDR (Double Data Rate) mode
726  * of the bus clock signal.
738  * iio_backend_ddr_disable - Disable interface DDR (Double Data Rate) mode
753  * iio_backend_data_stream_enable - Enable data stream
768  * iio_backend_data_stream_disable - Disable data stream
783  * iio_backend_data_transfer_addr - Set data address.
808 		ret = device_property_match_string(dev, "io-backend-names",  in __devm_iio_backend_fwnode_get()
817 	fwnode_back = fwnode_find_reference(fwnode, "io-backends", index);  in __devm_iio_backend_fwnode_get()
824 		if (!device_match_fwnode(back->dev, fwnode_back))  in __devm_iio_backend_fwnode_get()
833 			back->idx = index;  in __devm_iio_backend_fwnode_get()
839 	return ERR_PTR(-EPROBE_DEFER);  in __devm_iio_backend_fwnode_get()
843  * devm_iio_backend_get - Device managed backend device get
859  * devm_iio_backend_fwnode_get - Device managed backend firmware node get
878  * __devm_iio_backend_get_from_fwnode_lookup - Device managed fwnode backend device get
898 		if (!device_match_fwnode(back->dev, fwnode))  in __devm_iio_backend_get_from_fwnode_lookup()
908 	return ERR_PTR(-EPROBE_DEFER);  in __devm_iio_backend_get_from_fwnode_lookup()
913  * iio_backend_get_priv - Get driver private data
918 	return back->priv;  in iio_backend_get_priv()
927 	list_del(&back->entry);  in iio_backend_unregister()
931  * devm_iio_backend_register - Device managed backend device register
936  * @info is mandatory. Not providing it results in -EINVAL.
946 	if (!info || !info->ops)  in devm_iio_backend_register()
947 		return dev_err_probe(dev, -EINVAL, "No backend ops given\n");  in devm_iio_backend_register()
957 		return -ENOMEM;  in devm_iio_backend_register()
959 	back->ops = info->ops;  in devm_iio_backend_register()
960 	back->name = info->name;  in devm_iio_backend_register()
961 	back->owner = dev->driver->owner;  in devm_iio_backend_register()
962 	back->dev = dev;  in devm_iio_backend_register()
963 	back->priv = priv;  in devm_iio_backend_register()
965 		list_add(&back->entry, &iio_back_list);  in devm_iio_backend_register()