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SubjectRe: [PATCH 3/3] mic: cosm: module autoprobing support for cosm driver
On Fri, Sep 25, 2020 at 03:31:58PM +0800, Sherry Sun wrote:
> Add uevent callback for cosm_bus and add cosm_device_id for cosm driver
> which is needed for MODULE_DEVICE_TABLE. Also adding struct
> cosm_device_id in devicetable-offsets.c and the cosm entry point in
> file2alias.c.
>
> Cosm driver will be autoloaded when cosm device appears.
>
> Signed-off-by: Sherry Sun <sherry.sun@nxp.com>
> ---
> drivers/misc/mic/bus/cosm_bus.c | 8 ++++++++
> drivers/misc/mic/cosm/cosm_main.c | 7 +++++++
> include/linux/mod_devicetable.h | 8 ++++++++
> scripts/mod/devicetable-offsets.c | 3 +++
> scripts/mod/file2alias.c | 11 +++++++++++
> 5 files changed, 37 insertions(+)
>
> diff --git a/drivers/misc/mic/bus/cosm_bus.c b/drivers/misc/mic/bus/cosm_bus.c
> index 5f2141c71738..736e27bbc9f9 100644
> --- a/drivers/misc/mic/bus/cosm_bus.c
> +++ b/drivers/misc/mic/bus/cosm_bus.c
> @@ -14,6 +14,13 @@
> /* Unique numbering for cosm devices. */
> static DEFINE_IDA(cosm_index_ida);
>
> +static int cosm_uevent(struct device *d, struct kobj_uevent_env *env)
> +{
> + struct cosm_device *dev = dev_to_cosm(d);
> +
> + return add_uevent_var(env, "MODALIAS=cosm:cosm-dev%u", dev->index);
> +}
> +
> static int cosm_dev_probe(struct device *d)
> {
> struct cosm_device *dev = dev_to_cosm(d);
> @@ -33,6 +40,7 @@ static int cosm_dev_remove(struct device *d)
>
> static struct bus_type cosm_bus = {
> .name = "cosm_bus",
> + .uevent = cosm_uevent,
> .probe = cosm_dev_probe,
> .remove = cosm_dev_remove,
> };
> diff --git a/drivers/misc/mic/cosm/cosm_main.c b/drivers/misc/mic/cosm/cosm_main.c
> index ebb0eac43754..627e7d5f3a83 100644
> --- a/drivers/misc/mic/cosm/cosm_main.c
> +++ b/drivers/misc/mic/cosm/cosm_main.c
> @@ -12,6 +12,7 @@
> #include <linux/idr.h>
> #include <linux/slab.h>
> #include <linux/cred.h>
> +#include <linux/mod_devicetable.h>
> #include "cosm_main.h"
>
> static const char cosm_driver_name[] = "mic";
> @@ -323,6 +324,12 @@ static int cosm_suspend(struct device *dev)
> return 0;
> }
>
> +static struct cosm_device_id __maybe_unused cosm_driver_id_table[] = {
> + { .name = "cosm-dev*" },
> + { },
> +};
> +MODULE_DEVICE_TABLE(cosm, cosm_driver_id_table);
> +
> static const struct dev_pm_ops cosm_pm_ops = {
> .suspend = cosm_suspend,
> .freeze = cosm_suspend
> diff --git a/include/linux/mod_devicetable.h b/include/linux/mod_devicetable.h
> index 736cdc236cf9..ea6cdfe1a3a3 100644
> --- a/include/linux/mod_devicetable.h
> +++ b/include/linux/mod_devicetable.h
> @@ -845,4 +845,12 @@ struct vop_device_id {
> };
> #define VOP_DEV_ANY_ID 0xffffffff
>
> +/* cosm */
> +#define COSM_NAME_SIZE 32
> +#define COSM_MODULE_PREFIX "cosm:"
> +
> +struct cosm_device_id {
> + char name[COSM_NAME_SIZE];
> +};
> +
> #endif /* LINUX_MOD_DEVICETABLE_H */
> diff --git a/scripts/mod/devicetable-offsets.c b/scripts/mod/devicetable-offsets.c
> index 393acaa5302a..499a2832878d 100644
> --- a/scripts/mod/devicetable-offsets.c
> +++ b/scripts/mod/devicetable-offsets.c
> @@ -247,5 +247,8 @@ int main(void)
> DEVID_FIELD(vop_device_id, device);
> DEVID_FIELD(vop_device_id, vendor);
>
> + DEVID(cosm_device_id);
> + DEVID_FIELD(cosm_device_id, name);
> +
> return 0;
> }
> diff --git a/scripts/mod/file2alias.c b/scripts/mod/file2alias.c
> index 8063b778eedf..f7c80e4da137 100644
> --- a/scripts/mod/file2alias.c
> +++ b/scripts/mod/file2alias.c
> @@ -1383,6 +1383,16 @@ static int do_vop_entry(const char *filename, void *symval,
> return 1;
> }
>
> +/* Looks like: cosm:S */
> +static int do_cosm_entry(const char *filename, void *symval,
> + char *alias)
> +{
> + DEF_FIELD_ADDR(symval, cosm_device_id, name);
> + sprintf(alias, COSM_MODULE_PREFIX "%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)
> {
> @@ -1458,6 +1468,7 @@ static const struct devtable devtable[] = {
> {"wmi", SIZE_wmi_device_id, do_wmi_entry},
> {"mhi", SIZE_mhi_device_id, do_mhi_entry},
> {"vop", SIZE_vop_device_id, do_vop_entry},
> + {"cosm", SIZE_cosm_device_id, do_cosm_entry},
> };
>
> /* Create MODULE_ALIAS() statements.
> --
> 2.17.1
>

You are adding MODULE_DEVICE_TABLE() support for a class of drivers, but
then never adding that support to those drivers? Why add this at all
then? Shouldn't you also be modifying a bunch of drivers to get this to
work properly?

thanks,

greg k-h

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