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staging: vc04_services: Support module autoloading using MODULE_DEVICE_TABLE 

VC04 has now a independent bus vchiq_bus to register its devices.
However, the module auto-loading for bcm2835-audio and bcm2835-camera
currently happens through MODULE_ALIAS() macro specified explicitly.

The correct way to auto-load a module, is when the alias is picked
out from MODULE_DEVICE_TABLE(). In order to get there, we need to
introduce  vchiq_device_id and add relevant entries in file2alias.c
infrastructure so that aliases can be generated. This patch targets
adding vchiq_device_id and do_vchiq_entry, in order to
generate those alias using the /script/mod/file2alias.c.

Going forward the MODULE_ALIAS() from bcm2835-camera and bcm2835-audio
will be dropped, in favour of MODULE_DEVICE_TABLE being used there.

The alias format for vchiq_bus devices will be "vchiq:<dev_name>".
Adjust the vchiq_bus_uevent() to reflect that.

Signed-off-by: Umang Jain <umang.jain@ideasonboard.com>
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Reviewed-by: Kieran Bingham <kieran.bingham@ideasonboard.com>
Link: https://lore.kernel.org/r/20231019090128.430297-2-umang.jain@ideasonboard.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Umang Jain 2023-10-19 14:31:26 +05:30 committed by Greg Kroah-Hartman
parent 75fd2810b0
commit 1fa0587758
5 changed files with 20 additions and 1 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
drivers/staging/vc04_services/interface/vchiq_arm/vchiq_bus.c
View File

@ -26,7 +26,7 @@ static int vchiq_bus_uevent(const struct device *dev, struct kobj_uevent_env *en
{
const struct vchiq_device *device = container_of_const(dev, struct vchiq_device, dev);
return add_uevent_var(env, "MODALIAS=%s", dev_name(&device->dev));
return add_uevent_var(env, "MODALIAS=vchiq:%s", dev_name(&device->dev));
}
static int vchiq_bus_probe(struct device *dev)

3
drivers/staging/vc04_services/interface/vchiq_arm/vchiq_bus.h
View File

@ -7,6 +7,7 @@
#define _VCHIQ_DEVICE_H
#include <linux/device.h>
#include <linux/mod_devicetable.h>
struct vchiq_device {
struct device dev;
@ -18,6 +19,8 @@ struct vchiq_driver {
int (*resume)(struct vchiq_device *device);
int (*suspend)(struct vchiq_device *device,
pm_message_t state);
const struct vchiq_device_id *id_table;
struct device_driver driver;
};

4
include/linux/mod_devicetable.h
View File

@ -946,4 +946,8 @@ struct cdx_device_id {
__u32 override_only;
};
struct vchiq_device_id {
char name[32];
};
#endif /* LINUX_MOD_DEVICETABLE_H */

3
scripts/mod/devicetable-offsets.c
View File

@ -267,5 +267,8 @@ int main(void)
DEVID_FIELD(cdx_device_id, device);
DEVID_FIELD(cdx_device_id, override_only);
DEVID(vchiq_device_id);
DEVID_FIELD(vchiq_device_id, name);
return 0;
}

9
scripts/mod/file2alias.c
View File

@ -1478,6 +1478,14 @@ static int do_cdx_entry(const char *filename, void *symval,
return 1;
}
static int do_vchiq_entry(const char *filename, void *symval, char *alias)
{
DEF_FIELD_ADDR(symval, vchiq_device_id, name);
sprintf(alias, "vchiq:%s", *name);
return 1;
}
/* Does namelen bytes of name exactly match the symbol? */
static bool sym_is(const char *name, unsigned namelen, const char *symbol)
{
@ -1558,6 +1566,7 @@ static const struct devtable devtable[] = {
{"dfl", SIZE_dfl_device_id, do_dfl_entry},
{"ishtp", SIZE_ishtp_device_id, do_ishtp_entry},
{"cdx", SIZE_cdx_device_id, do_cdx_entry},
{"vchiq", SIZE_vchiq_device_id, do_vchiq_entry},
};
/* Create MODULE_ALIAS() statements.