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bus: mhi: core: Add uevent support for module autoloading

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Add uevent support to MHI bus so that the client drivers can be autoloaded
by udev when the MHI devices gets created. The client drivers are
expected to provide MODULE_DEVICE_TABLE with the MHI id_table struct so
that the alias can be exported.

Signed-off-by: Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org>
Reviewed-by: Jeffrey Hugo <jhugo@codeaurora.org>
Tested-by: Jeffrey Hugo <jhugo@codeaurora.org>
Link: https://lore.kernel.org/r/20200220095854.4804-13-manivannan.sadhasivam@linaro.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Manivannan Sadhasivam 2020-02-20 15:28:50 +05:30 committed by Greg Kroah-Hartman
parent 189ff97cca
commit e6b0de469c
4 changed files with 23 additions and 0 deletions
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9
drivers/bus/mhi/core/init.c
View File

@ -1210,6 +1210,14 @@ void mhi_driver_unregister(struct mhi_driver *mhi_drv)
}
EXPORT_SYMBOL_GPL(mhi_driver_unregister);
static int mhi_uevent(struct device *dev, struct kobj_uevent_env *env)
{
struct mhi_device *mhi_dev = to_mhi_device(dev);
return add_uevent_var(env, "MODALIAS=" MHI_DEVICE_MODALIAS_FMT,
mhi_dev->chan_name);
}
static int mhi_match(struct device *dev, struct device_driver *drv)
{
struct mhi_device *mhi_dev = to_mhi_device(dev);
@ -1236,6 +1244,7 @@ struct bus_type mhi_bus_type = {
.name = "mhi",
.dev_name = "mhi",
.match = mhi_match,
.uevent = mhi_uevent,
};
static int __init mhi_init(void)

1
include/linux/mod_devicetable.h
View File

@ -821,6 +821,7 @@ struct wmi_device_id {
const void *context;
};
#define MHI_DEVICE_MODALIAS_FMT "mhi:%s"
#define MHI_NAME_SIZE 32
/**

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

@ -231,5 +231,8 @@ int main(void)
DEVID(wmi_device_id);
DEVID_FIELD(wmi_device_id, guid_string);
DEVID(mhi_device_id);
DEVID_FIELD(mhi_device_id, chan);
return 0;
}

10
scripts/mod/file2alias.c
View File

@ -1335,6 +1335,15 @@ static int do_wmi_entry(const char *filename, void *symval, char *alias)
return 1;
}
/* Looks like: mhi:S */
static int do_mhi_entry(const char *filename, void *symval, char *alias)
{
DEF_FIELD_ADDR(symval, mhi_device_id, chan);
sprintf(alias, MHI_DEVICE_MODALIAS_FMT, *chan);
return 1;
}
/* Does namelen bytes of name exactly match the symbol? */
static bool sym_is(const char *name, unsigned namelen, const char *symbol)
{
@ -1407,6 +1416,7 @@ static const struct devtable devtable[] = {
{"typec", SIZE_typec_device_id, do_typec_entry},
{"tee", SIZE_tee_client_device_id, do_tee_entry},
{"wmi", SIZE_wmi_device_id, do_wmi_entry},
{"mhi", SIZE_mhi_device_id, do_mhi_entry},
};
/* Create MODULE_ALIAS() statements.