1 // SPDX-License-Identifier: GPL-2.0-only
3  * Function Control Protocol (IEC 61883-1) helper functions
10 #include <linux/firewire-constants.h>
16 #include <linux/wait.h>
20 #include "amdtp-stream.h"
45 		return -EINVAL;  in avc_general_set_sig_fmt()
49 		return -ENOMEM;  in avc_general_set_sig_fmt()
59 	buf[5] = 0x07 & sfc;	/* FDF-hi. AM824, frequency */  in avc_general_set_sig_fmt()
60 	buf[6] = 0xff;		/* FDF-mid. AM824, SYT hi (not used)*/  in avc_general_set_sig_fmt()
61 	buf[7] = 0xff;		/* FDF-low. AM824, SYT lo (not used) */  in avc_general_set_sig_fmt()
63 	/* do transaction and check buf[1-5] are the same against command */  in avc_general_set_sig_fmt()
69 		err = -EIO;  in avc_general_set_sig_fmt()
71 		err = -ENOSYS;  in avc_general_set_sig_fmt()
73 		err = -EINVAL;  in avc_general_set_sig_fmt()
94 		return -ENOMEM;  in avc_general_get_sig_fmt()
104 	buf[5] = 0xff;		/* FDF-hi. AM824, frequency */  in avc_general_get_sig_fmt()
105 	buf[6] = 0xff;		/* FDF-mid. AM824, SYT hi (not used) */  in avc_general_get_sig_fmt()
106 	buf[7] = 0xff;		/* FDF-low. AM824, SYT lo (not used) */  in avc_general_get_sig_fmt()
108 	/* do transaction and check buf[1-4] are the same against command */  in avc_general_get_sig_fmt()
114 		err = -EIO;  in avc_general_get_sig_fmt()
116 		err = -ENOSYS;  in avc_general_get_sig_fmt()
118 		err = -EINVAL;  in avc_general_get_sig_fmt()
120 		err = -EAGAIN;  in avc_general_get_sig_fmt()
127 		err = -EAGAIN;	/* also in transition */  in avc_general_get_sig_fmt()
148 		return -EINVAL;  in avc_general_get_plug_info()
152 		return -ENOMEM;  in avc_general_get_plug_info()
164 		err = -EIO;  in avc_general_get_plug_info()
166 		err = -ENOSYS;  in avc_general_get_plug_info()
168 		err = -EINVAL;  in avc_general_get_plug_info()
170 		err = -EAGAIN;  in avc_general_get_plug_info()
202 	enum fcp_state state;  member
203 	wait_queue_head_t wait;  member
208  * fcp_avc_transaction - send an AV/C command and wait for its response
210  * @command: a buffer containing the command frame; must be DMA-able
241 	t.state = STATE_PENDING;  in fcp_avc_transaction()
242 	init_waitqueue_head(&t.wait);  in fcp_avc_transaction()
260 		wait_event_timeout(t.wait, t.state != STATE_PENDING,  in fcp_avc_transaction()
263 		if (t.state == STATE_DEFERRED) {  in fcp_avc_transaction()
271 			t.state = STATE_PENDING;  in fcp_avc_transaction()
273 		} else if (t.state == STATE_COMPLETE) {  in fcp_avc_transaction()
276 		} else if (t.state == STATE_BUS_RESET) {  in fcp_avc_transaction()
279 			dev_err(&t.unit->device, "FCP command timed out\n");  in fcp_avc_transaction()
280 			ret = -EIO;  in fcp_avc_transaction()
294  * fcp_bus_reset - inform the target handler about a bus reset
307 		if (t->unit == unit &&  in fcp_bus_reset()
308 		    (t->state == STATE_PENDING ||  in fcp_bus_reset()
309 		     t->state == STATE_DEFERRED)) {  in fcp_bus_reset()
310 			t->state = STATE_BUS_RESET;  in fcp_bus_reset()
311 			wake_up(&t->wait);  in fcp_bus_reset()
326 	p2 = transaction->response_buffer;  in is_matching_response()
327 	mask = transaction->response_match_bytes;  in is_matching_response()
335 		if (--length == 0)  in is_matching_response()
353 		struct fw_device *device = fw_parent_device(t->unit);  in fcp_response()
354 		if (device->card != card ||  in fcp_response()
355 		    device->generation != generation)  in fcp_response()
358 		if (device->node_id != source)  in fcp_response()
361 		if (t->state == STATE_PENDING &&  in fcp_response()
363 			if (t->deferrable && *(const u8 *)data == 0x0f) {  in fcp_response()
364 				t->state = STATE_DEFERRED;  in fcp_response()
366 				t->state = STATE_COMPLETE;  in fcp_response()
367 				t->response_size = min_t(unsigned int, length,  in fcp_response()
368 							 t->response_size);  in fcp_response()
369 				memcpy(t->response_buffer, data,  in fcp_response()
370 				       t->response_size);  in fcp_response()
372 			wake_up(&t->wait);  in fcp_response()