// SPDX-License-Identifier: GPL-2.0-only
/*
* MIPI DisCo for Imaging support.
*
* Copyright (C) 2023 Intel Corporation
*
* Support MIPI DisCo for Imaging by parsing ACPI _CRS CSI-2 records defined in
* Section 6.4.3.8.2.4 "Camera Serial Interface (CSI-2) Connection Resource
* Descriptor" of ACPI 6.5 and using device properties defined by the MIPI DisCo
* for Imaging specification.
*
* The implementation looks for the information in the ACPI namespace (CSI-2
* resource descriptors in _CRS) and constructs software nodes compatible with
* Documentation/firmware-guide/acpi/dsd/graph.rst to represent the CSI-2
* connection graph. The software nodes are then populated with the data
* extracted from the _CRS CSI-2 resource descriptors and the MIPI DisCo
* for Imaging device properties present in _DSD for the ACPI device objects
* with CSI-2 connections.
*/
#include <linux/acpi.h>
#include <linux/dmi.h>
#include <linux/limits.h>
#include <linux/list.h>
#include <linux/module.h>
#include <linux/overflow.h>
#include <linux/types.h>
#include <linux/slab.h>
#include <linux/string.h>
#include <media/v4l2-fwnode.h>
#include "internal.h"
static LIST_HEAD(acpi_mipi_crs_csi2_list);
static void acpi_mipi_data_tag(acpi_handle handle, void *context)
{
}
/* Connection data extracted from one _CRS CSI-2 resource descriptor. */
struct crs_csi2_connection {
struct list_head entry;
struct acpi_resource_csi2_serialbus csi2_data;
acpi_handle remote_handle;
char remote_name[];
};
/* Data extracted from _CRS CSI-2 resource descriptors for one device. */
struct crs_csi2 {
struct list_head entry;
acpi_handle handle;
struct acpi_device_software_nodes *swnodes;
struct list_head connections;
u32 port_count;
};
struct csi2_resources_walk_data {
acpi_handle handle;
struct list_head connections;
};
static acpi_status parse_csi2_resource(struct acpi_resource *res, void *context)
{
struct csi2_resources_walk_data *crwd = context;
struct acpi_resource_csi2_serialbus *csi2_res;
struct acpi_resource_source *csi2_res_src;
u16 csi2_res_src_length;
struct crs_csi2_connection *conn;
acpi_handle remote_handle;
if (res->type != ACPI_RESOURCE_TYPE_SERIAL_BUS)
return AE_OK;
csi2_res = &res->data.csi2_serial_bus;
if (csi2_res->type != ACPI_RESOURCE_SERIAL_TYPE_CSI2)
return AE_OK;
csi2_res_src = &csi2_res->resource_source;
if (ACPI_FAILURE(acpi_get_handle(NULL, csi2_res_src->string_ptr,
&remote_handle))) {
acpi_handle_debug(crwd->handle,
"unable to find resource source\n");
return AE_OK;
}
csi2_res_src_length = csi2_res_src->string_length;
if (!csi2_res_src_length) {
acpi_handle_debug(crwd->handle,
"invalid resource source string length\n");
return AE_OK;
}
conn = kmalloc(struct_size(conn, remote_name, csi2_res_src_length + 1),
GFP_KERNEL);
if (!conn)
return AE_OK;
conn->csi2_data = *csi2_res;
strscpy(conn->remote_name, csi2_res_src->string_ptr, csi2_res_src_length);
conn->csi2_data.resource_source.string_ptr = conn->remote_name;
conn->remote_handle = remote_handle;
list_add(&conn->entry, &crwd->connections);
return AE_OK;
}
static struct crs_csi2 *acpi_mipi_add_crs_csi2(acpi_handle handle,
struct list_head *list)
{
struct crs_csi2 *csi2;
csi2 = kzalloc(sizeof(*csi2), GFP_KERNEL);
if (!csi2)
return NULL;
csi2->handle = handle;
INIT_LIST_HEAD(&csi2->connections);
csi2->port_count = 1;
if (ACPI_FAILURE(acpi_attach_data(handle, acpi_mipi_data_tag, csi2))) {
kfree(csi2);
return NULL;
}
list_add(&csi2->entry, list);
return csi2;
}
static struct crs_csi2 *acpi_mipi_get_crs_csi2(acpi_handle handle)
{
struct crs_csi2 *csi2;
if (ACPI_FAILURE(acpi_get_data_full(handle, acpi_mipi_data_tag,
(void **)&csi2, NULL)))
return NULL;
return csi2;
}
static void csi_csr2_release_connections(struct list_head *list)
{
struct crs_csi2_connection *conn, *conn_tmp;
list_for_each_entry_safe(conn, conn_tmp, list, entry) {
list_del(&conn->entry);
kfree(conn);
}
}
static void acpi_mipi_del_crs_csi2(struct crs_csi2 *csi2)
{
list_del(&csi2->entry);
acpi_detach_data(csi2->handle, acpi_mipi_data_tag);
kfree(csi2->swnodes);
csi_csr2_release_connections(&csi2->connections);
kfree(csi2);
}
/**
* acpi_mipi_check_crs_csi2 - Look for CSI-2 resources in _CRS
* @handle: Device object handle to evaluate _CRS for.
*
* Find all CSI-2 resource descriptors in the given device's _CRS
* and collect them into a list.
*/
void acpi_mipi_check_crs_csi2(acpi_handle handle)
{
struct csi2_resources_walk_data crwd = {
.handle = handle,
.connections = LIST_HEAD_INIT(crwd.connections),
};
struct crs_csi2 *csi2;
/*
* Avoid allocating _CRS CSI-2 objects for devices without any CSI-2
* resource descriptions in _CRS to reduce overhead.
*/
acpi_walk_resources(handle, METHOD_NAME__CRS, parse_csi2_resource, &crwd);
if (list_empty(&crwd.connections))
return;
/*
* Create a _CRS CSI-2 entry to store the extracted connection
* information and add it to the global list.
*/
csi2 = acpi_mipi_add_crs_csi2(handle, &acpi_mipi_crs_csi2_list);
if (!csi2) {
csi_csr2_release_connections(&crwd.connections);
return; /* Nothing really can be done about this. */
}
list_replace(&crwd.connections, &csi2->connections);
}
#define NO_CSI2_PORT (UINT_MAX - 1)
static void alloc_crs_csi2_swnodes(struct crs_csi2 *csi2)
{
size_t port_count = csi2->port_count;
struct acpi_device_software_nodes *swnodes;
size_t alloc_size;
unsigned int i;
/*
* Allocate memory for ports, node pointers (number of nodes +
* 1 (guardian), nodes (root + number of ports * 2 (because for
* every port there is an endpoint)).
*/
if (check_mul_overflow(sizeof(*swnodes->ports) +
sizeof(*swnodes->nodes) * 2 +
sizeof(*swnodes->nodeptrs) * 2,
port_count, &alloc_size) ||
check_add_overflow(sizeof(*swnodes) +
sizeof(*swnodes->nodes) +
sizeof(*swnodes->nodeptrs) * 2,
alloc_size, &alloc_size)) {
acpi_handle_info(csi2->handle,
"too many _CRS CSI-2 resource handles (%zu)",
port_count);
return;
}
swnodes = kmalloc(alloc_size, GFP_KERNEL);
if (!swnodes)
return;
swnodes->ports = (struct acpi_device_software_node_port *)(swnodes + 1);
swnodes->nodes = (struct software_node *)(swnodes->ports + port_count);
swnodes->nodeptrs = (const struct software_node **)(swnodes->nodes + 1 +
2 * port_count);
swnodes->num_ports = port_count;
for (i = 0; i < 2 * port_count + 1; i++)
swnodes->nodeptrs[i] = &swnodes->nodes[i];
swnodes->nodeptrs[i] = NULL;
for (i = 0; i < port_count; i++)
swnodes->ports[i].port_nr = NO_CSI2_PORT;
csi2->swnodes = swnodes;
}
#define ACPI_CRS_CSI2_PHY_TYPE_C 0
#define ACPI_CRS_CSI2_PHY_TYPE_D 1
static unsigned int next_csi2_port_index(struct acpi_device_software_nodes *swnodes,
unsigned int port_nr)
{
unsigned int i;
for (i = 0; i < swnodes->num_ports; i++) {
struct acpi_device_software_node_port *port = &swnodes->ports[i];
if (port->port_nr == port_nr)
return i;
if (port->port_nr == NO_CSI2_PORT) {
port->port_nr = port_nr;
return i;
}
}
return NO_CSI2_PORT;
}
/* Print graph port name into a buffer, return non-zero on failure. */
#define GRAPH_PORT_NAME(var, num) \
(snprintf((var), sizeof(var), SWNODE_GRAPH_PORT_NAME_FMT, (num)) >= \
sizeof(var))
static void extract_crs_csi2_conn_info(acpi_handle local_handle,
struct acpi_device_software_nodes *local_swnodes,
struct crs_csi2_connection *conn)
{
struct crs_csi2 *remote_csi2 = acpi_mipi_get_crs_csi2(conn->remote_handle);
struct acpi_device_software_nodes *remote_swnodes;
struct acpi_device_software_node_port *local_port, *remote_port;
struct software_node *local_node, *remote_node;
unsigned int local_index, remote_index;
unsigned int bus_type;
/*
* If the previous steps have failed to make room for a _CRS CSI-2
* representation for the remote end of the given connection, skip it.
*/
if (!remote_csi2)
return;
remote_swnodes = remote_csi2->swnodes;
if (!remote_swnodes)
return;
switch (conn->csi2_data.phy_type) {
case ACPI_CRS_CSI2_PHY_TYPE_C:
bus_type = V4L2_FWNODE_BUS_TYPE_CSI2_CPHY;
break;
case ACPI_CRS_CSI2_PHY_TYPE_D:
bus_type = V4L2_FWNODE_BUS_TYPE_CSI2_DPHY;
break;
default:
acpi_handle_info(local_handle, "unknown CSI-2 PHY type %u\n",
conn->csi2_data.phy_type);
return;
}
local_index = next_csi2_port_index(local_swnodes,
conn->csi2_data.local_port_instance);
if (WARN_ON_ONCE(local_index >= local_swnodes->num_ports))
return;
remote_index = next_csi2_port_index(remote_swnodes,
conn->csi2_data.resource_source.index);
if (WARN_ON_ONCE(remote_index >= remote_swnodes->num_ports))
return;
local_port = &local_swnodes->ports[local_index];
local_node = &local_swnodes->nodes[ACPI_DEVICE_SWNODE_EP(local_index)];
local_port->crs_csi2_local = true;
remote_port = &remote_swnodes->ports[remote_index];
remote_node = &remote_swnodes->nodes[ACPI_DEVICE_SWNODE_EP(remote_index)];
local_port->remote_ep[0] = SOFTWARE_NODE_REFERENCE(remote_node);
remote_port->remote_ep[0] = SOFTWARE_NODE_REFERENCE(local_node);
local_port->ep_props[ACPI_DEVICE_SWNODE_EP_REMOTE_EP] =
PROPERTY_ENTRY_REF_ARRAY("remote-endpoint",
local_port->remote_ep);
local_port->ep_props[ACPI_DEVICE_SWNODE_EP_BUS_TYPE] =
PROPERTY_ENTRY_U32("bus-type", bus_type);
local_port->ep_props[ACPI_DEVICE_SWNODE_EP_REG] =
PROPERTY_ENTRY_U32("reg", 0);
local_port->port_props[ACPI_DEVICE_SWNODE_PORT_REG] =
PROPERTY_ENTRY_U32("reg", conn->csi2_data.local_port_instance);
if (GRAPH_PORT_NAME(local_port->port_name,
conn->csi2_data.local_port_instance))
acpi_handle_info(local_handle, "local port %u name too long",
conn->csi2_data.local_port_instance);
remote_port->ep_props[ACPI_DEVICE_SWNODE_EP_REMOTE_EP] =
PROPERTY_ENTRY_REF_ARRAY("remote-endpoint",
remote_port->remote_ep);
remote_port->ep_props[ACPI_DEVICE_SWNODE_EP_BUS_TYPE] =
PROPERTY_ENTRY_U32("bus-type", bus_type);
remote_port->ep_props[ACPI_DEVICE_SWNODE_EP_REG] =
PROPERTY_ENTRY_U32("reg", 0);
remote_port->port_props[ACPI_DEVICE_SWNODE_PORT_REG] =
PROPERTY_ENTRY_U32("reg", conn->csi2_data.resource_source.index);
if (GRAPH_PORT_NAME(remote_port->port_name,
conn->csi2_data.resource_source.index))
acpi_handle_info(local_handle, "remote port %u name too long",
conn->csi2_data.resource_source.index);
}
static void prepare_crs_csi2_swnodes(struct crs_csi2 *csi2)
{
struct acpi_device_software_nodes *local_swnodes = csi2->swnodes;
acpi_handle local_handle = csi2->handle;
struct crs_csi2_connection *conn;
/* Bail out if the allocation of swnodes has failed. */
if (!local_swnodes)
return;
list_for_each_entry(conn, &csi2->connections, entry)
extract_crs_csi2_conn_info(local_handle, local_swnodes, conn);
}
/**
* acpi_mipi_scan_crs_csi2 - Create ACPI _CRS CSI-2 software nodes
*
* Note that this function must be called before any struct acpi_device objects
* are bound to any ACPI drivers or scan handlers, so it cannot assume the
* existence of struct acpi_device objects for every device present in the ACPI
* namespace.
*
* acpi_scan_lock in scan.c must be held when calling this function.
*/
void acpi_mipi_scan_crs_csi2(void)
{
struct crs_csi2 *csi2;
LIST_HEAD(aux_list);
/* Count references to each ACPI handle in the CSI-2 connection graph. */
list_for_each_entry(csi2, &acpi_mipi_crs_csi2_list, entry) {
struct crs_csi2_connection *conn;
list_for_each_entry(conn, &csi2->connections, entry) {
struct crs_csi2 *remote_csi2;
csi2->port_count++;
remote_csi2 = acpi_mipi_get_crs_csi2(conn->remote_handle);
if (remote_csi2) {
remote_csi2->port_count++;
continue;
}
/*
* The remote endpoint has no _CRS CSI-2 list entry yet,
* so create one for it and add it to the list.
*/
acpi_mipi_add_crs_csi2(conn->remote_handle, &aux_list);
}
}
list_splice(&aux_list, &acpi_mipi_crs_csi2_list);
/*
* Allocate software nodes for representing the CSI-2 information.
*
* This needs to be done for all of the list entries in one go, because
* they may point to each other without restrictions and the next step
* relies on the availability of swnodes memory for each list entry.
*/
list_for_each_entry(csi2, &acpi_mipi_crs_csi2_list, entry)
alloc_crs_csi2_swnodes(csi2);
/*
* Set up software node properties using data from _CRS CSI-2 resource
* descriptors.
*/
list_for_each_entry(csi2, &acpi_mipi_crs_csi2_list, entry)
prepare_crs_csi2_swnodes(csi2);
}
/*
* Get the index of the next property in the property array, with a given
* maximum value.
*/
#define NEXT_PROPERTY(index, max) \
(WARN_ON((index) > ACPI_DEVICE_SWNODE_##max) ? \
ACPI_DEVICE_SWNODE_##max : (index)++)
static void init_csi2_port_local(struct acpi_device *adev,
struct acpi_device_software_node_port *port,
struct fwnode_handle *port_fwnode,
unsigned int index)
{
acpi_handle handle = acpi_device_handle(adev);
unsigned int num_link_freqs;
int ret;
ret = fwnode_property_count_u64(port_fwnode, "mipi-img-link-frequencies");
if (ret <= 0)
return;
num_link_freqs = ret;
if (num_link_freqs > ACPI_DEVICE_CSI2_DATA_LANES) {
acpi_handle_info(handle, "Too many link frequencies: %u\n",
num_link_freqs);
num_link_freqs = ACPI_DEVICE_CSI2_DATA_LANES;
}
ret = fwnode_property_read_u64_array(port_fwnode,
"mipi-img-link-frequencies",
port->link_frequencies,
num_link_freqs);
if (ret) {
acpi_handle_info(handle, "Unable to get link frequencies (%d)\n",
ret);
return;
}
port->ep_props[NEXT_PROPERTY(index, EP_LINK_FREQUENCIES)] =
PROPERTY_ENTRY_U64_ARRAY_LEN("link-frequencies",
port->link_frequencies,
num_link_freqs);
}
static void init_csi2_port(struct acpi_device *adev,
struct acpi_device_software_nodes *swnodes,
struct acpi_device_software_node_port *port,
struct fwnode_handle *port_fwnode,
unsigned int port_index)
{
unsigned int ep_prop_index = ACPI_DEVICE_SWNODE_EP_CLOCK_LANES;
acpi_handle handle = acpi_device_handle(adev);
u8 val[ACPI_DEVICE_CSI2_DATA_LANES];
int num_lanes = 0;
int ret;
if (GRAPH_PORT_NAME(port->port_name, port->port_nr))
return;
swnodes->nodes[ACPI_DEVICE_SWNODE_PORT(port_index)] =
SOFTWARE_NODE(port->port_name, port->port_props,
&swnodes->nodes[ACPI_DEVICE_SWNODE_ROOT]);
ret = fwnode_property_read_u8(port_fwnode, "mipi-img-clock-lane", val);
if (!ret)
port->ep_props[NEXT_PROPERTY(ep_prop_index, EP_CLOCK_LANES)] =
PROPERTY_ENTRY_U32("clock-lanes", val[0]);
ret = fwnode_property_count_u8(port_fwnode, "mipi-img-data-lanes");
if (ret > 0) {
num_lanes = ret;
if (num_lanes > ACPI_DEVICE_CSI2_DATA_LANES) {
acpi_handle_info(handle, "Too many data lanes: %u\n",
num_lanes);
num_lanes = ACPI_DEVICE_CSI2_DATA_LANES;
}
ret = fwnode_property_read_u8_array(port_fwnode,
"mipi-img-data-lanes",
val, num_lanes);
if (!ret) {
unsigned int i;
for (i = 0; i < num_lanes; i++)
port->data_lanes[i] = val[i];
port->ep_props[NEXT_PROPERTY(ep_prop_index, EP_DATA_LANES)] =
PROPERTY_ENTRY_U32_ARRAY_LEN("data-lanes",
port->data_lanes,
num_lanes);
}
}
ret = fwnode_property_count_u8(port_fwnode, "mipi-img-lane-polarities");
if (ret < 0) {
acpi_handle_debug(handle, "Lane polarity bytes missing\n");
} else if (ret * BITS_PER_TYPE(u8) < num_lanes + 1) {
acpi_handle_info(handle, "Too few lane polarity bits (%zu vs. %d)\n",
ret * BITS_PER_TYPE(u8), num_lanes + 1);
} else {
unsigned long mask = 0;
int byte_count = ret;
unsigned int i;
/*
* The total number of lanes is ACPI_DEVICE_CSI2_DATA_LANES + 1
* (data lanes + clock lane). It is not expected to ever be
* greater than the number of bits in an unsigned long
* variable, but ensure that this is the case.
*/
BUILD_BUG_ON(BITS_PER_TYPE(unsigned long) <= ACPI_DEVICE_CSI2_DATA_LANES);
if (byte_count > sizeof(mask)) {
acpi_handle_info(handle, "Too many lane polarities: %d\n",
byte_count);
byte_count = sizeof(mask);
}
fwnode_property_read_u8_array(port_fwnode, "mipi-img-lane-polarities",
val, byte_count);
for (i = 0; i < byte_count; i++)
mask |= (unsigned long)val[i] << BITS_PER_TYPE(u8) * i;
for (i = 0; i <= num_lanes; i++)
port->lane_polarities[i] = test_bit(i, &mask);
port->ep_props[NEXT_PROPERTY(ep_prop_index, EP_LANE_POLARITIES)] =
PROPERTY_ENTRY_U32_ARRAY_LEN("lane-polarities",
port->lane_polarities,
num_lanes + 1);
}
swnodes->nodes[ACPI_DEVICE_SWNODE_EP(port_index)] =
SOFTWARE_NODE("endpoint@0", swnodes->ports[port_index].ep_props,
&swnodes->nodes[ACPI_DEVICE_SWNODE_PORT(port_index)]);
if (port->crs_csi2_local)
init_csi2_port_local(adev, port, port_fwnode, ep_prop_index);
}
#define MIPI_IMG_PORT_PREFIX "mipi-img-port-"
static struct fwnode_handle *get_mipi_port_handle(struct fwnode_handle *adev_fwnode,
unsigned int port_nr)
{
char port_name[sizeof(MIPI_IMG_PORT_PREFIX) + 2];
if (snprintf(port_name, sizeof(port_name), "%s%u",
MIPI_IMG_PORT_PREFIX, port_nr) >= sizeof(port_name))
return NULL;
return fwnode_get_named_child_node(adev_fwnode, port_name);
}
static void init_crs_csi2_swnodes(struct crs_csi2 *csi2)
{
struct acpi_buffer buffer = { .length = ACPI_ALLOCATE_BUFFER };
struct acpi_device_software_nodes *swnodes = csi2->swnodes;
acpi_handle handle = csi2->handle;
unsigned int prop_index = 0;
struct fwnode_handle *adev_fwnode;
struct acpi_device *adev;
acpi_status status;
unsigned int i;
u32 val;
int ret;
/*
* Bail out if the swnodes are not available (either they have not been
* allocated or they have been assigned to the device already).
*/
if (!swnodes)
return;
adev = acpi_fetch_acpi_dev(handle);
if (!adev)
return;
adev_fwnode = acpi_fwnode_handle(adev);
/*
* If the "rotation" property is not present, but _PLD is there,
* evaluate it to get the "rotation" value.
*/
if (!fwnode_property_present(adev_fwnode, "rotation")) {
struct acpi_pld_info *pld;
status = acpi_get_physical_device_location(handle, &pld);
if (ACPI_SUCCESS(status)) {
swnodes->dev_props[NEXT_PROPERTY(prop_index, DEV_ROTATION)] =
PROPERTY_ENTRY_U32("rotation",
pld->rotation * 45U);
kfree(pld);
}
}
if (!fwnode_property_read_u32(adev_fwnode, "mipi-img-clock-frequency", &val))
swnodes->dev_props[NEXT_PROPERTY(prop_index, DEV_CLOCK_FREQUENCY)] =
PROPERTY_ENTRY_U32("clock-frequency", val);
if (!fwnode_property_read_u32(adev_fwnode, "mipi-img-led-max-current", &val))
swnodes->dev_props[NEXT_PROPERTY(prop_index, DEV_LED_MAX_MICROAMP)] =
PROPERTY_ENTRY_U32("led-max-microamp", val);
if (!fwnode_property_read_u32(adev_fwnode, "mipi-img-flash-max-current", &val))
swnodes->dev_props[NEXT_PROPERTY(prop_index, DEV_FLASH_MAX_MICROAMP)] =
PROPERTY_ENTRY_U32("flash-max-microamp", val);
if (!fwnode_property_read_u32(adev_fwnode, "mipi-img-flash-max-timeout-us", &val))
swnodes->dev_props[NEXT_PROPERTY(prop_index, DEV_FLASH_MAX_TIMEOUT_US)] =
PROPERTY_ENTRY_U32("flash-max-timeout-us", val);
status = acpi_get_name(handle, ACPI_FULL_PATHNAME, &buffer);
if (ACPI_FAILURE(status)) {
acpi_handle_info(handle, "Unable to get the path name\n");
return;
}
swnodes->nodes[ACPI_DEVICE_SWNODE_ROOT] =
SOFTWARE_NODE(buffer.pointer, swnodes->dev_props, NULL);
for (i = 0; i < swnodes->num_ports; i++) {
struct acpi_device_software_node_port *port = &swnodes->ports[i];
struct fwnode_handle *port_fwnode;
/*
* The MIPI DisCo for Imaging specification defines _DSD device
* properties for providing CSI-2 port parameters that can be
* accessed through the generic device properties framework. To
* access them, it is first necessary to find the data node
* representing the port under the given ACPI device object.
*/
port_fwnode = get_mipi_port_handle(adev_fwnode, port->port_nr);
if (!port_fwnode) {
acpi_handle_info(handle,
"MIPI port name too long for port %u\n",
port->port_nr);
continue;
}
init_csi2_port(adev, swnodes, port, port_fwnode, i);
fwnode_handle_put(port_fwnode);
}
ret = software_node_register_node_group(swnodes->nodeptrs);
if (ret < 0) {
acpi_handle_info(handle,
"Unable to register software nodes (%d)\n", ret);
return;
}
adev->swnodes = swnodes;
adev_fwnode->secondary = software_node_fwnode(swnodes->nodes);
/*
* Prevents the swnodes from this csi2 entry from being assigned again
* or freed prematurely.
*/
csi2->swnodes = NULL;
}
/**
* acpi_mipi_init_crs_csi2_swnodes - Initialize _CRS CSI-2 software nodes
*
* Use MIPI DisCo for Imaging device properties to finalize the initialization
* of CSI-2 software nodes for all ACPI device objects that have been already
* enumerated.
*/
void acpi_mipi_init_crs_csi2_swnodes(void)
{
struct crs_csi2 *csi2, *csi2_tmp;
list_for_each_entry_safe(csi2, csi2_tmp, &acpi_mipi_crs_csi2_list, entry)
init_crs_csi2_swnodes(csi2);
}
/**
* acpi_mipi_crs_csi2_cleanup - Free _CRS CSI-2 temporary data
*/
void acpi_mipi_crs_csi2_cleanup(void)
{
struct crs_csi2 *csi2, *csi2_tmp;
list_for_each_entry_safe(csi2, csi2_tmp, &acpi_mipi_crs_csi2_list, entry)
acpi_mipi_del_crs_csi2(csi2);
}
#ifdef CONFIG_X86
#include <asm/cpu_device_id.h>
#include <asm/intel-family.h>
/* CPU matches for Dell generations with broken ACPI MIPI DISCO info */
static const struct x86_cpu_id dell_broken_mipi_disco_cpu_gens[] = {
X86_MATCH_VFM(INTEL_TIGERLAKE, NULL),
X86_MATCH_VFM(INTEL_TIGERLAKE_L, NULL),
X86_MATCH_VFM(INTEL_ALDERLAKE, NULL),
X86_MATCH_VFM(INTEL_ALDERLAKE_L, NULL),
X86_MATCH_VFM(INTEL_RAPTORLAKE, NULL),
X86_MATCH_VFM(INTEL_RAPTORLAKE_P, NULL),
X86_MATCH_VFM(INTEL_RAPTORLAKE_S, NULL),
{}
};
static const char *strnext(const char *s1, const char *s2)
{
s1 = strstr(s1, s2);
if (!s1)
return NULL;
return s1 + strlen(s2);
}
/**
* acpi_graph_ignore_port - Tell whether a port node should be ignored
* @handle: The ACPI handle of the node (which may be a port node)
*
* Return: true if a port node should be ignored and the data to that should
* come from other sources instead (Windows ACPI definitions and
* ipu-bridge). This is currently used to ignore bad port nodes related to IPU6
* ("IPU?") and camera sensor devices ("LNK?") in certain Dell systems with
* Intel VSC.
*/
bool acpi_graph_ignore_port(acpi_handle handle)
{
const char *path = NULL, *orig_path;
static bool dmi_tested, ignore_port;
if (!dmi_tested) {
if (dmi_name_in_vendors("Dell Inc.") &&
x86_match_cpu(dell_broken_mipi_disco_cpu_gens))
ignore_port = true;
dmi_tested = true;
}
if (!ignore_port)
return false;
/* Check if the device is either "IPU" or "LNK" (sensor). */
orig_path = acpi_handle_path(handle);
if (!orig_path)
return false;
path = strnext(orig_path, "IPU");
if (!path)
path = strnext(orig_path, "LNK");
if (!path)
goto out_free;
if (!(isdigit(path[0]) && path[1] == '.'))
goto out_free;
/* Check if the node has a "PRT" prefix. */
path = strnext(path, "PRT");
if (path && isdigit(path[0]) && !path[1]) {
acpi_handle_debug(handle, "ignoring data node\n");
kfree(orig_path);
return true;
}
out_free:
kfree(orig_path);
return false;
}
#endif
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