Commit 5d4be19c authored by Manivannan Sadhasivam's avatar Manivannan Sadhasivam
Browse files

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



Add uevent support to MHI endpoint bus so that the client drivers can be
autoloaded by udev when the MHI endpoint 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.

The MHI endpoint reused the mhi_device_id structure of the MHI bus.

Reviewed-by: default avatarAlex Elder <elder@linaro.org>
Signed-off-by: default avatarManivannan Sadhasivam <manivannan.sadhasivam@linaro.org>
parent 5fb83d97

drivers/bus/mhi/ep/main.c

+9 −0
Original line number Diff line number Diff line
@@ -1536,6 +1536,14 @@ void mhi_ep_driver_unregister(struct mhi_ep_driver *mhi_drv) 
}

EXPORT_SYMBOL_GPL(mhi_ep_driver_unregister);



static int mhi_ep_uevent(struct device *dev, struct kobj_uevent_env *env)

{

	struct mhi_ep_device *mhi_dev = to_mhi_ep_device(dev);



	return add_uevent_var(env, "MODALIAS=" MHI_EP_DEVICE_MODALIAS_FMT,

					mhi_dev->name);

}



static int mhi_ep_match(struct device *dev, struct device_driver *drv)

{

	struct mhi_ep_device *mhi_dev = to_mhi_ep_device(dev);
@@ -1562,6 +1570,7 @@ struct bus_type mhi_ep_bus_type = { 
	.name = "mhi_ep",

	.dev_name = "mhi_ep",

	.match = mhi_ep_match,

	.uevent = mhi_ep_uevent,

};



static int __init mhi_ep_init(void)

include/linux/mod_devicetable.h

+2 −0
Original line number Diff line number Diff line
@@ -835,6 +835,8 @@ struct wmi_device_id { 
#define MHI_DEVICE_MODALIAS_FMT "mhi:%s"

#define MHI_NAME_SIZE 32



#define MHI_EP_DEVICE_MODALIAS_FMT "mhi_ep:%s"



/**

 * struct mhi_device_id - MHI device identification

 * @chan: MHI channel name

scripts/mod/file2alias.c

+10 −0
Original line number Diff line number Diff line
@@ -1391,6 +1391,15 @@ static int do_mhi_entry(const char *filename, void *symval, char *alias) 
	return 1;

}



/* Looks like: mhi_ep:S */

static int do_mhi_ep_entry(const char *filename, void *symval, char *alias)

{

	DEF_FIELD_ADDR(symval, mhi_device_id, chan);

	sprintf(alias, MHI_EP_DEVICE_MODALIAS_FMT, *chan);



	return 1;

}



/* Looks like: ishtp:{guid} */

static int do_ishtp_entry(const char *filename, void *symval, char *alias)

{
@@ -1519,6 +1528,7 @@ static const struct devtable devtable[] = { 
	{"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},

	{"mhi_ep", SIZE_mhi_device_id, do_mhi_ep_entry},

	{"auxiliary", SIZE_auxiliary_device_id, do_auxiliary_entry},

	{"ssam", SIZE_ssam_device_id, do_ssam_entry},

	{"dfl", SIZE_dfl_device_id, do_dfl_entry},