1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * MIPI DisCo for Imaging support.
4 *
5 * Copyright (C) 2023 Intel Corporation
6 *
7 * Support MIPI DisCo for Imaging by parsing ACPI _CRS CSI-2 records defined in
8 * Section 6.4.3.8.2.4 "Camera Serial Interface (CSI-2) Connection Resource
9 * Descriptor" of ACPI 6.5 and using device properties defined by the MIPI DisCo
10 * for Imaging specification.
11 *
12 * The implementation looks for the information in the ACPI namespace (CSI-2
13 * resource descriptors in _CRS) and constructs software nodes compatible with
14 * Documentation/firmware-guide/acpi/dsd/graph.rst to represent the CSI-2
15 * connection graph. The software nodes are then populated with the data
16 * extracted from the _CRS CSI-2 resource descriptors and the MIPI DisCo
17 * for Imaging device properties present in _DSD for the ACPI device objects
18 * with CSI-2 connections.
19 */
20
21#include <linux/acpi.h>
22#include <linux/dmi.h>
23#include <linux/limits.h>
24#include <linux/list.h>
25#include <linux/module.h>
26#include <linux/overflow.h>
27#include <linux/types.h>
28#include <linux/slab.h>
29#include <linux/string.h>
30
31#include <media/v4l2-fwnode.h>
32
33#include "internal.h"
34
35static LIST_HEAD(acpi_mipi_crs_csi2_list);
36
37static void acpi_mipi_data_tag(acpi_handle handle, void *context)
38{
39}
40
41/* Connection data extracted from one _CRS CSI-2 resource descriptor. */
42struct crs_csi2_connection {
43 struct list_head entry;
44 struct acpi_resource_csi2_serialbus csi2_data;
45 acpi_handle remote_handle;
46 char remote_name[];
47};
48
49/* Data extracted from _CRS CSI-2 resource descriptors for one device. */
50struct crs_csi2 {
51 struct list_head entry;
52 acpi_handle handle;
53 struct acpi_device_software_nodes *swnodes;
54 struct list_head connections;
55 u32 port_count;
56};
57
58struct csi2_resources_walk_data {
59 acpi_handle handle;
60 struct list_head connections;
61};
62
63static acpi_status parse_csi2_resource(struct acpi_resource *res, void *context)
64{
65 struct csi2_resources_walk_data *crwd = context;
66 struct acpi_resource_csi2_serialbus *csi2_res;
67 struct acpi_resource_source *csi2_res_src;
68 u16 csi2_res_src_length;
69 struct crs_csi2_connection *conn;
70 acpi_handle remote_handle;
71
72 if (res->type != ACPI_RESOURCE_TYPE_SERIAL_BUS)
73 return AE_OK;
74
75 csi2_res = &res->data.csi2_serial_bus;
76
77 if (csi2_res->type != ACPI_RESOURCE_SERIAL_TYPE_CSI2)
78 return AE_OK;
79
80 csi2_res_src = &csi2_res->resource_source;
81 if (ACPI_FAILURE(acpi_get_handle(NULL, csi2_res_src->string_ptr,
82 &remote_handle))) {
83 acpi_handle_debug(crwd->handle,
84 "unable to find resource source\n");
85 return AE_OK;
86 }
87 csi2_res_src_length = csi2_res_src->string_length;
88 if (!csi2_res_src_length) {
89 acpi_handle_debug(crwd->handle,
90 "invalid resource source string length\n");
91 return AE_OK;
92 }
93
94 conn = kmalloc(struct_size(conn, remote_name, csi2_res_src_length + 1),
95 GFP_KERNEL);
96 if (!conn)
97 return AE_OK;
98
99 conn->csi2_data = *csi2_res;
100 strscpy(conn->remote_name, csi2_res_src->string_ptr, csi2_res_src_length);
101 conn->csi2_data.resource_source.string_ptr = conn->remote_name;
102 conn->remote_handle = remote_handle;
103
104 list_add(new: &conn->entry, head: &crwd->connections);
105
106 return AE_OK;
107}
108
109static struct crs_csi2 *acpi_mipi_add_crs_csi2(acpi_handle handle,
110 struct list_head *list)
111{
112 struct crs_csi2 *csi2;
113
114 csi2 = kzalloc(sizeof(*csi2), GFP_KERNEL);
115 if (!csi2)
116 return NULL;
117
118 csi2->handle = handle;
119 INIT_LIST_HEAD(list: &csi2->connections);
120 csi2->port_count = 1;
121
122 if (ACPI_FAILURE(acpi_attach_data(handle, acpi_mipi_data_tag, csi2))) {
123 kfree(objp: csi2);
124 return NULL;
125 }
126
127 list_add(new: &csi2->entry, head: list);
128
129 return csi2;
130}
131
132static struct crs_csi2 *acpi_mipi_get_crs_csi2(acpi_handle handle)
133{
134 struct crs_csi2 *csi2;
135
136 if (ACPI_FAILURE(acpi_get_data_full(handle, acpi_mipi_data_tag,
137 (void **)&csi2, NULL)))
138 return NULL;
139
140 return csi2;
141}
142
143static void csi_csr2_release_connections(struct list_head *list)
144{
145 struct crs_csi2_connection *conn, *conn_tmp;
146
147 list_for_each_entry_safe(conn, conn_tmp, list, entry) {
148 list_del(entry: &conn->entry);
149 kfree(objp: conn);
150 }
151}
152
153static void acpi_mipi_del_crs_csi2(struct crs_csi2 *csi2)
154{
155 list_del(entry: &csi2->entry);
156 acpi_detach_data(object: csi2->handle, handler: acpi_mipi_data_tag);
157 kfree(objp: csi2->swnodes);
158 csi_csr2_release_connections(list: &csi2->connections);
159 kfree(objp: csi2);
160}
161
162/**
163 * acpi_mipi_check_crs_csi2 - Look for CSI-2 resources in _CRS
164 * @handle: Device object handle to evaluate _CRS for.
165 *
166 * Find all CSI-2 resource descriptors in the given device's _CRS
167 * and collect them into a list.
168 */
169void acpi_mipi_check_crs_csi2(acpi_handle handle)
170{
171 struct csi2_resources_walk_data crwd = {
172 .handle = handle,
173 .connections = LIST_HEAD_INIT(crwd.connections),
174 };
175 struct crs_csi2 *csi2;
176
177 /*
178 * Avoid allocating _CRS CSI-2 objects for devices without any CSI-2
179 * resource descriptions in _CRS to reduce overhead.
180 */
181 acpi_walk_resources(device: handle, METHOD_NAME__CRS, user_function: parse_csi2_resource, context: &crwd);
182 if (list_empty(head: &crwd.connections))
183 return;
184
185 /*
186 * Create a _CRS CSI-2 entry to store the extracted connection
187 * information and add it to the global list.
188 */
189 csi2 = acpi_mipi_add_crs_csi2(handle, list: &acpi_mipi_crs_csi2_list);
190 if (!csi2) {
191 csi_csr2_release_connections(list: &crwd.connections);
192 return; /* Nothing really can be done about this. */
193 }
194
195 list_replace(old: &crwd.connections, new: &csi2->connections);
196}
197
198#define NO_CSI2_PORT (UINT_MAX - 1)
199
200static void alloc_crs_csi2_swnodes(struct crs_csi2 *csi2)
201{
202 size_t port_count = csi2->port_count;
203 struct acpi_device_software_nodes *swnodes;
204 size_t alloc_size;
205 unsigned int i;
206
207 /*
208 * Allocate memory for ports, node pointers (number of nodes +
209 * 1 (guardian), nodes (root + number of ports * 2 (because for
210 * every port there is an endpoint)).
211 */
212 if (check_mul_overflow(sizeof(*swnodes->ports) +
213 sizeof(*swnodes->nodes) * 2 +
214 sizeof(*swnodes->nodeptrs) * 2,
215 port_count, &alloc_size) ||
216 check_add_overflow(sizeof(*swnodes) +
217 sizeof(*swnodes->nodes) +
218 sizeof(*swnodes->nodeptrs) * 2,
219 alloc_size, &alloc_size)) {
220 acpi_handle_info(csi2->handle,
221 "too many _CRS CSI-2 resource handles (%zu)",
222 port_count);
223 return;
224 }
225
226 swnodes = kmalloc(alloc_size, GFP_KERNEL);
227 if (!swnodes)
228 return;
229
230 swnodes->ports = (struct acpi_device_software_node_port *)(swnodes + 1);
231 swnodes->nodes = (struct software_node *)(swnodes->ports + port_count);
232 swnodes->nodeptrs = (const struct software_node **)(swnodes->nodes + 1 +
233 2 * port_count);
234 swnodes->num_ports = port_count;
235
236 for (i = 0; i < 2 * port_count + 1; i++)
237 swnodes->nodeptrs[i] = &swnodes->nodes[i];
238
239 swnodes->nodeptrs[i] = NULL;
240
241 for (i = 0; i < port_count; i++)
242 swnodes->ports[i].port_nr = NO_CSI2_PORT;
243
244 csi2->swnodes = swnodes;
245}
246
247#define ACPI_CRS_CSI2_PHY_TYPE_C 0
248#define ACPI_CRS_CSI2_PHY_TYPE_D 1
249
250static unsigned int next_csi2_port_index(struct acpi_device_software_nodes *swnodes,
251 unsigned int port_nr)
252{
253 unsigned int i;
254
255 for (i = 0; i < swnodes->num_ports; i++) {
256 struct acpi_device_software_node_port *port = &swnodes->ports[i];
257
258 if (port->port_nr == port_nr)
259 return i;
260
261 if (port->port_nr == NO_CSI2_PORT) {
262 port->port_nr = port_nr;
263 return i;
264 }
265 }
266
267 return NO_CSI2_PORT;
268}
269
270/* Print graph port name into a buffer, return non-zero on failure. */
271#define GRAPH_PORT_NAME(var, num) \
272 (snprintf((var), sizeof(var), SWNODE_GRAPH_PORT_NAME_FMT, (num)) >= \
273 sizeof(var))
274
275static void extract_crs_csi2_conn_info(acpi_handle local_handle,
276 struct acpi_device_software_nodes *local_swnodes,
277 struct crs_csi2_connection *conn)
278{
279 struct crs_csi2 *remote_csi2 = acpi_mipi_get_crs_csi2(handle: conn->remote_handle);
280 struct acpi_device_software_nodes *remote_swnodes;
281 struct acpi_device_software_node_port *local_port, *remote_port;
282 struct software_node *local_node, *remote_node;
283 unsigned int local_index, remote_index;
284 unsigned int bus_type;
285
286 /*
287 * If the previous steps have failed to make room for a _CRS CSI-2
288 * representation for the remote end of the given connection, skip it.
289 */
290 if (!remote_csi2)
291 return;
292
293 remote_swnodes = remote_csi2->swnodes;
294 if (!remote_swnodes)
295 return;
296
297 switch (conn->csi2_data.phy_type) {
298 case ACPI_CRS_CSI2_PHY_TYPE_C:
299 bus_type = V4L2_FWNODE_BUS_TYPE_CSI2_CPHY;
300 break;
301
302 case ACPI_CRS_CSI2_PHY_TYPE_D:
303 bus_type = V4L2_FWNODE_BUS_TYPE_CSI2_DPHY;
304 break;
305
306 default:
307 acpi_handle_info(local_handle, "unknown CSI-2 PHY type %u\n",
308 conn->csi2_data.phy_type);
309 return;
310 }
311
312 local_index = next_csi2_port_index(swnodes: local_swnodes,
313 port_nr: conn->csi2_data.local_port_instance);
314 if (WARN_ON_ONCE(local_index >= local_swnodes->num_ports))
315 return;
316
317 remote_index = next_csi2_port_index(swnodes: remote_swnodes,
318 port_nr: conn->csi2_data.resource_source.index);
319 if (WARN_ON_ONCE(remote_index >= remote_swnodes->num_ports))
320 return;
321
322 local_port = &local_swnodes->ports[local_index];
323 local_node = &local_swnodes->nodes[ACPI_DEVICE_SWNODE_EP(local_index)];
324 local_port->crs_csi2_local = true;
325
326 remote_port = &remote_swnodes->ports[remote_index];
327 remote_node = &remote_swnodes->nodes[ACPI_DEVICE_SWNODE_EP(remote_index)];
328
329 local_port->remote_ep[0] = SOFTWARE_NODE_REFERENCE(remote_node);
330 remote_port->remote_ep[0] = SOFTWARE_NODE_REFERENCE(local_node);
331
332 local_port->ep_props[ACPI_DEVICE_SWNODE_EP_REMOTE_EP] =
333 PROPERTY_ENTRY_REF_ARRAY("remote-endpoint",
334 local_port->remote_ep);
335
336 local_port->ep_props[ACPI_DEVICE_SWNODE_EP_BUS_TYPE] =
337 PROPERTY_ENTRY_U32("bus-type", bus_type);
338
339 local_port->ep_props[ACPI_DEVICE_SWNODE_EP_REG] =
340 PROPERTY_ENTRY_U32("reg", 0);
341
342 local_port->port_props[ACPI_DEVICE_SWNODE_PORT_REG] =
343 PROPERTY_ENTRY_U32("reg", conn->csi2_data.local_port_instance);
344
345 if (GRAPH_PORT_NAME(local_port->port_name,
346 conn->csi2_data.local_port_instance))
347 acpi_handle_info(local_handle, "local port %u name too long",
348 conn->csi2_data.local_port_instance);
349
350 remote_port->ep_props[ACPI_DEVICE_SWNODE_EP_REMOTE_EP] =
351 PROPERTY_ENTRY_REF_ARRAY("remote-endpoint",
352 remote_port->remote_ep);
353
354 remote_port->ep_props[ACPI_DEVICE_SWNODE_EP_BUS_TYPE] =
355 PROPERTY_ENTRY_U32("bus-type", bus_type);
356
357 remote_port->ep_props[ACPI_DEVICE_SWNODE_EP_REG] =
358 PROPERTY_ENTRY_U32("reg", 0);
359
360 remote_port->port_props[ACPI_DEVICE_SWNODE_PORT_REG] =
361 PROPERTY_ENTRY_U32("reg", conn->csi2_data.resource_source.index);
362
363 if (GRAPH_PORT_NAME(remote_port->port_name,
364 conn->csi2_data.resource_source.index))
365 acpi_handle_info(local_handle, "remote port %u name too long",
366 conn->csi2_data.resource_source.index);
367}
368
369static void prepare_crs_csi2_swnodes(struct crs_csi2 *csi2)
370{
371 struct acpi_device_software_nodes *local_swnodes = csi2->swnodes;
372 acpi_handle local_handle = csi2->handle;
373 struct crs_csi2_connection *conn;
374
375 /* Bail out if the allocation of swnodes has failed. */
376 if (!local_swnodes)
377 return;
378
379 list_for_each_entry(conn, &csi2->connections, entry)
380 extract_crs_csi2_conn_info(local_handle, local_swnodes, conn);
381}
382
383/**
384 * acpi_mipi_scan_crs_csi2 - Create ACPI _CRS CSI-2 software nodes
385 *
386 * Note that this function must be called before any struct acpi_device objects
387 * are bound to any ACPI drivers or scan handlers, so it cannot assume the
388 * existence of struct acpi_device objects for every device present in the ACPI
389 * namespace.
390 *
391 * acpi_scan_lock in scan.c must be held when calling this function.
392 */
393void acpi_mipi_scan_crs_csi2(void)
394{
395 struct crs_csi2 *csi2;
396 LIST_HEAD(aux_list);
397
398 /* Count references to each ACPI handle in the CSI-2 connection graph. */
399 list_for_each_entry(csi2, &acpi_mipi_crs_csi2_list, entry) {
400 struct crs_csi2_connection *conn;
401
402 list_for_each_entry(conn, &csi2->connections, entry) {
403 struct crs_csi2 *remote_csi2;
404
405 csi2->port_count++;
406
407 remote_csi2 = acpi_mipi_get_crs_csi2(handle: conn->remote_handle);
408 if (remote_csi2) {
409 remote_csi2->port_count++;
410 continue;
411 }
412 /*
413 * The remote endpoint has no _CRS CSI-2 list entry yet,
414 * so create one for it and add it to the list.
415 */
416 acpi_mipi_add_crs_csi2(handle: conn->remote_handle, list: &aux_list);
417 }
418 }
419 list_splice(list: &aux_list, head: &acpi_mipi_crs_csi2_list);
420
421 /*
422 * Allocate software nodes for representing the CSI-2 information.
423 *
424 * This needs to be done for all of the list entries in one go, because
425 * they may point to each other without restrictions and the next step
426 * relies on the availability of swnodes memory for each list entry.
427 */
428 list_for_each_entry(csi2, &acpi_mipi_crs_csi2_list, entry)
429 alloc_crs_csi2_swnodes(csi2);
430
431 /*
432 * Set up software node properties using data from _CRS CSI-2 resource
433 * descriptors.
434 */
435 list_for_each_entry(csi2, &acpi_mipi_crs_csi2_list, entry)
436 prepare_crs_csi2_swnodes(csi2);
437}
438
439/*
440 * Get the index of the next property in the property array, with a given
441 * maximum value.
442 */
443#define NEXT_PROPERTY(index, max) \
444 (WARN_ON((index) > ACPI_DEVICE_SWNODE_##max) ? \
445 ACPI_DEVICE_SWNODE_##max : (index)++)
446
447static void init_csi2_port_local(struct acpi_device *adev,
448 struct acpi_device_software_node_port *port,
449 struct fwnode_handle *port_fwnode,
450 unsigned int index)
451{
452 acpi_handle handle = acpi_device_handle(adev);
453 unsigned int num_link_freqs;
454 int ret;
455
456 ret = fwnode_property_count_u64(fwnode: port_fwnode, propname: "mipi-img-link-frequencies");
457 if (ret <= 0)
458 return;
459
460 num_link_freqs = ret;
461 if (num_link_freqs > ACPI_DEVICE_CSI2_DATA_LANES) {
462 acpi_handle_info(handle, "Too many link frequencies: %u\n",
463 num_link_freqs);
464 num_link_freqs = ACPI_DEVICE_CSI2_DATA_LANES;
465 }
466
467 ret = fwnode_property_read_u64_array(fwnode: port_fwnode,
468 propname: "mipi-img-link-frequencies",
469 val: port->link_frequencies,
470 nval: num_link_freqs);
471 if (ret) {
472 acpi_handle_info(handle, "Unable to get link frequencies (%d)\n",
473 ret);
474 return;
475 }
476
477 port->ep_props[NEXT_PROPERTY(index, EP_LINK_FREQUENCIES)] =
478 PROPERTY_ENTRY_U64_ARRAY_LEN("link-frequencies",
479 port->link_frequencies,
480 num_link_freqs);
481}
482
483static void init_csi2_port(struct acpi_device *adev,
484 struct acpi_device_software_nodes *swnodes,
485 struct acpi_device_software_node_port *port,
486 struct fwnode_handle *port_fwnode,
487 unsigned int port_index)
488{
489 unsigned int ep_prop_index = ACPI_DEVICE_SWNODE_EP_CLOCK_LANES;
490 acpi_handle handle = acpi_device_handle(adev);
491 u8 val[ACPI_DEVICE_CSI2_DATA_LANES];
492 int num_lanes = 0;
493 int ret;
494
495 if (GRAPH_PORT_NAME(port->port_name, port->port_nr))
496 return;
497
498 swnodes->nodes[ACPI_DEVICE_SWNODE_PORT(port_index)] =
499 SOFTWARE_NODE(port->port_name, port->port_props,
500 &swnodes->nodes[ACPI_DEVICE_SWNODE_ROOT]);
501
502 ret = fwnode_property_read_u8(fwnode: port_fwnode, propname: "mipi-img-clock-lane", val);
503 if (!ret)
504 port->ep_props[NEXT_PROPERTY(ep_prop_index, EP_CLOCK_LANES)] =
505 PROPERTY_ENTRY_U32("clock-lanes", val[0]);
506
507 ret = fwnode_property_count_u8(fwnode: port_fwnode, propname: "mipi-img-data-lanes");
508 if (ret > 0) {
509 num_lanes = ret;
510
511 if (num_lanes > ACPI_DEVICE_CSI2_DATA_LANES) {
512 acpi_handle_info(handle, "Too many data lanes: %u\n",
513 num_lanes);
514 num_lanes = ACPI_DEVICE_CSI2_DATA_LANES;
515 }
516
517 ret = fwnode_property_read_u8_array(fwnode: port_fwnode,
518 propname: "mipi-img-data-lanes",
519 val, nval: num_lanes);
520 if (!ret) {
521 unsigned int i;
522
523 for (i = 0; i < num_lanes; i++)
524 port->data_lanes[i] = val[i];
525
526 port->ep_props[NEXT_PROPERTY(ep_prop_index, EP_DATA_LANES)] =
527 PROPERTY_ENTRY_U32_ARRAY_LEN("data-lanes",
528 port->data_lanes,
529 num_lanes);
530 }
531 }
532
533 ret = fwnode_property_count_u8(fwnode: port_fwnode, propname: "mipi-img-lane-polarities");
534 if (ret < 0) {
535 acpi_handle_debug(handle, "Lane polarity bytes missing\n");
536 } else if (ret * BITS_PER_TYPE(u8) < num_lanes + 1) {
537 acpi_handle_info(handle, "Too few lane polarity bits (%zu vs. %d)\n",
538 ret * BITS_PER_TYPE(u8), num_lanes + 1);
539 } else {
540 unsigned long mask = 0;
541 int byte_count = ret;
542 unsigned int i;
543
544 /*
545 * The total number of lanes is ACPI_DEVICE_CSI2_DATA_LANES + 1
546 * (data lanes + clock lane). It is not expected to ever be
547 * greater than the number of bits in an unsigned long
548 * variable, but ensure that this is the case.
549 */
550 BUILD_BUG_ON(BITS_PER_TYPE(unsigned long) <= ACPI_DEVICE_CSI2_DATA_LANES);
551
552 if (byte_count > sizeof(mask)) {
553 acpi_handle_info(handle, "Too many lane polarities: %d\n",
554 byte_count);
555 byte_count = sizeof(mask);
556 }
557 fwnode_property_read_u8_array(fwnode: port_fwnode, propname: "mipi-img-lane-polarities",
558 val, nval: byte_count);
559
560 for (i = 0; i < byte_count; i++)
561 mask |= (unsigned long)val[i] << BITS_PER_TYPE(u8) * i;
562
563 for (i = 0; i <= num_lanes; i++)
564 port->lane_polarities[i] = test_bit(i, &mask);
565
566 port->ep_props[NEXT_PROPERTY(ep_prop_index, EP_LANE_POLARITIES)] =
567 PROPERTY_ENTRY_U32_ARRAY_LEN("lane-polarities",
568 port->lane_polarities,
569 num_lanes + 1);
570 }
571
572 swnodes->nodes[ACPI_DEVICE_SWNODE_EP(port_index)] =
573 SOFTWARE_NODE("endpoint@0", swnodes->ports[port_index].ep_props,
574 &swnodes->nodes[ACPI_DEVICE_SWNODE_PORT(port_index)]);
575
576 if (port->crs_csi2_local)
577 init_csi2_port_local(adev, port, port_fwnode, index: ep_prop_index);
578}
579
580#define MIPI_IMG_PORT_PREFIX "mipi-img-port-"
581
582static struct fwnode_handle *get_mipi_port_handle(struct fwnode_handle *adev_fwnode,
583 unsigned int port_nr)
584{
585 char port_name[sizeof(MIPI_IMG_PORT_PREFIX) + 2];
586
587 if (snprintf(buf: port_name, size: sizeof(port_name), fmt: "%s%u",
588 MIPI_IMG_PORT_PREFIX, port_nr) >= sizeof(port_name))
589 return NULL;
590
591 return fwnode_get_named_child_node(fwnode: adev_fwnode, childname: port_name);
592}
593
594static void init_crs_csi2_swnodes(struct crs_csi2 *csi2)
595{
596 struct acpi_buffer buffer = { .length = ACPI_ALLOCATE_BUFFER };
597 struct acpi_device_software_nodes *swnodes = csi2->swnodes;
598 acpi_handle handle = csi2->handle;
599 unsigned int prop_index = 0;
600 struct fwnode_handle *adev_fwnode;
601 struct acpi_device *adev;
602 acpi_status status;
603 unsigned int i;
604 u32 val;
605 int ret;
606
607 /*
608 * Bail out if the swnodes are not available (either they have not been
609 * allocated or they have been assigned to the device already).
610 */
611 if (!swnodes)
612 return;
613
614 adev = acpi_fetch_acpi_dev(handle);
615 if (!adev)
616 return;
617
618 adev_fwnode = acpi_fwnode_handle(adev);
619
620 /*
621 * If the "rotation" property is not present, but _PLD is there,
622 * evaluate it to get the "rotation" value.
623 */
624 if (!fwnode_property_present(fwnode: adev_fwnode, propname: "rotation")) {
625 struct acpi_pld_info *pld;
626
627 if (acpi_get_physical_device_location(handle, pld: &pld)) {
628 swnodes->dev_props[NEXT_PROPERTY(prop_index, DEV_ROTATION)] =
629 PROPERTY_ENTRY_U32("rotation",
630 pld->rotation * 45U);
631 kfree(objp: pld);
632 }
633 }
634
635 if (!fwnode_property_read_u32(fwnode: adev_fwnode, propname: "mipi-img-clock-frequency", val: &val))
636 swnodes->dev_props[NEXT_PROPERTY(prop_index, DEV_CLOCK_FREQUENCY)] =
637 PROPERTY_ENTRY_U32("clock-frequency", val);
638
639 if (!fwnode_property_read_u32(fwnode: adev_fwnode, propname: "mipi-img-led-max-current", val: &val))
640 swnodes->dev_props[NEXT_PROPERTY(prop_index, DEV_LED_MAX_MICROAMP)] =
641 PROPERTY_ENTRY_U32("led-max-microamp", val);
642
643 if (!fwnode_property_read_u32(fwnode: adev_fwnode, propname: "mipi-img-flash-max-current", val: &val))
644 swnodes->dev_props[NEXT_PROPERTY(prop_index, DEV_FLASH_MAX_MICROAMP)] =
645 PROPERTY_ENTRY_U32("flash-max-microamp", val);
646
647 if (!fwnode_property_read_u32(fwnode: adev_fwnode, propname: "mipi-img-flash-max-timeout-us", val: &val))
648 swnodes->dev_props[NEXT_PROPERTY(prop_index, DEV_FLASH_MAX_TIMEOUT_US)] =
649 PROPERTY_ENTRY_U32("flash-max-timeout-us", val);
650
651 status = acpi_get_name(object: handle, ACPI_FULL_PATHNAME, ret_path_ptr: &buffer);
652 if (ACPI_FAILURE(status)) {
653 acpi_handle_info(handle, "Unable to get the path name\n");
654 return;
655 }
656
657 swnodes->nodes[ACPI_DEVICE_SWNODE_ROOT] =
658 SOFTWARE_NODE(buffer.pointer, swnodes->dev_props, NULL);
659
660 for (i = 0; i < swnodes->num_ports; i++) {
661 struct acpi_device_software_node_port *port = &swnodes->ports[i];
662 struct fwnode_handle *port_fwnode;
663
664 /*
665 * The MIPI DisCo for Imaging specification defines _DSD device
666 * properties for providing CSI-2 port parameters that can be
667 * accessed through the generic device properties framework. To
668 * access them, it is first necessary to find the data node
669 * representing the port under the given ACPI device object.
670 */
671 port_fwnode = get_mipi_port_handle(adev_fwnode, port_nr: port->port_nr);
672 if (!port_fwnode) {
673 acpi_handle_info(handle,
674 "MIPI port name too long for port %u\n",
675 port->port_nr);
676 continue;
677 }
678
679 init_csi2_port(adev, swnodes, port, port_fwnode, port_index: i);
680
681 fwnode_handle_put(fwnode: port_fwnode);
682 }
683
684 ret = software_node_register_node_group(node_group: swnodes->nodeptrs);
685 if (ret < 0) {
686 acpi_handle_info(handle,
687 "Unable to register software nodes (%d)\n", ret);
688 return;
689 }
690
691 adev->swnodes = swnodes;
692 adev_fwnode->secondary = software_node_fwnode(node: swnodes->nodes);
693
694 /*
695 * Prevents the swnodes from this csi2 entry from being assigned again
696 * or freed prematurely.
697 */
698 csi2->swnodes = NULL;
699}
700
701/**
702 * acpi_mipi_init_crs_csi2_swnodes - Initialize _CRS CSI-2 software nodes
703 *
704 * Use MIPI DisCo for Imaging device properties to finalize the initialization
705 * of CSI-2 software nodes for all ACPI device objects that have been already
706 * enumerated.
707 */
708void acpi_mipi_init_crs_csi2_swnodes(void)
709{
710 struct crs_csi2 *csi2, *csi2_tmp;
711
712 list_for_each_entry_safe(csi2, csi2_tmp, &acpi_mipi_crs_csi2_list, entry)
713 init_crs_csi2_swnodes(csi2);
714}
715
716/**
717 * acpi_mipi_crs_csi2_cleanup - Free _CRS CSI-2 temporary data
718 */
719void acpi_mipi_crs_csi2_cleanup(void)
720{
721 struct crs_csi2 *csi2, *csi2_tmp;
722
723 list_for_each_entry_safe(csi2, csi2_tmp, &acpi_mipi_crs_csi2_list, entry)
724 acpi_mipi_del_crs_csi2(csi2);
725}
726
727#ifdef CONFIG_X86
728#include <asm/cpu_device_id.h>
729#include <asm/intel-family.h>
730
731/* CPU matches for Dell generations with broken ACPI MIPI DISCO info */
732static const struct x86_cpu_id dell_broken_mipi_disco_cpu_gens[] = {
733 X86_MATCH_VFM(INTEL_TIGERLAKE, NULL),
734 X86_MATCH_VFM(INTEL_TIGERLAKE_L, NULL),
735 X86_MATCH_VFM(INTEL_ALDERLAKE, NULL),
736 X86_MATCH_VFM(INTEL_ALDERLAKE_L, NULL),
737 X86_MATCH_VFM(INTEL_RAPTORLAKE, NULL),
738 X86_MATCH_VFM(INTEL_RAPTORLAKE_P, NULL),
739 X86_MATCH_VFM(INTEL_RAPTORLAKE_S, NULL),
740 {}
741};
742
743static const char *strnext(const char *s1, const char *s2)
744{
745 s1 = strstr(s1, s2);
746
747 if (!s1)
748 return NULL;
749
750 return s1 + strlen(s2);
751}
752
753/**
754 * acpi_graph_ignore_port - Tell whether a port node should be ignored
755 * @handle: The ACPI handle of the node (which may be a port node)
756 *
757 * Return: true if a port node should be ignored and the data to that should
758 * come from other sources instead (Windows ACPI definitions and
759 * ipu-bridge). This is currently used to ignore bad port nodes related to IPU6
760 * ("IPU?") and camera sensor devices ("LNK?") in certain Dell systems with
761 * Intel VSC.
762 */
763bool acpi_graph_ignore_port(acpi_handle handle)
764{
765 const char *path = NULL, *orig_path;
766 static bool dmi_tested, ignore_port;
767
768 if (!dmi_tested) {
769 if (dmi_name_in_vendors(str: "Dell Inc.") &&
770 x86_match_cpu(match: dell_broken_mipi_disco_cpu_gens))
771 ignore_port = true;
772
773 dmi_tested = true;
774 }
775
776 if (!ignore_port)
777 return false;
778
779 /* Check if the device is either "IPU" or "LNK" (sensor). */
780 orig_path = acpi_handle_path(handle);
781 if (!orig_path)
782 return false;
783 path = strnext(s1: orig_path, s2: "IPU");
784 if (!path)
785 path = strnext(s1: orig_path, s2: "LNK");
786 if (!path)
787 goto out_free;
788
789 if (!(isdigit(c: path[0]) && path[1] == '.'))
790 goto out_free;
791
792 /* Check if the node has a "PRT" prefix. */
793 path = strnext(s1: path, s2: "PRT");
794 if (path && isdigit(c: path[0]) && !path[1]) {
795 acpi_handle_debug(handle, "ignoring data node\n");
796
797 kfree(objp: orig_path);
798 return true;
799 }
800
801out_free:
802 kfree(objp: orig_path);
803 return false;
804}
805#endif
806

source code of linux/drivers/acpi/mipi-disco-img.c