linux-kernel - [PATCH 3/3] mic: cosm: module autoprobing support for cosm driver

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Date:   Fri, 25 Sep 2020 15:31:58 +0800
From:   Sherry Sun <sherry.sun@....com>
To:     sudeep.dutt@...el.com, ashutosh.dixit@...el.com, arnd@...db.de,
        gregkh@...uxfoundation.org, masahiroy@...nel.org,
        michal.lkml@...kovi.net, lee.jones@...aro.org,
        rikard.falkeborn@...il.com, mst@...hat.co, bp@...e.de,
        jhugo@...eaurora.org, tglx@...utronix.de,
        manivannan.sadhasivam@...aro.org, mgross@...ux.intel.com,
        pierre-louis.bossart@...ux.intel.com
Cc:     linux-kernel@...r.kernel.org, linux-kbuild@...r.kernel.org,
        linux-imx@....com
Subject: [PATCH 3/3] mic: cosm: module autoprobing support for cosm driver

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@....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