linux-kernel - [PATCH v4 27/27] bus: mhi: ep: Add uevent support for module autoloading

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Message-Id: <20220228124344.77359-28-manivannan.sadhasivam@linaro.org>
Date:   Mon, 28 Feb 2022 18:13:44 +0530
From:   Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>
To:     mhi@...ts.linux.dev
Cc:     quic_hemantk@...cinc.com, quic_bbhatt@...cinc.com,
        quic_jhugo@...cinc.com, vinod.koul@...aro.org,
        bjorn.andersson@...aro.org, dmitry.baryshkov@...aro.org,
        quic_vbadigan@...cinc.com, quic_cang@...cinc.com,
        quic_skananth@...cinc.com, linux-arm-msm@...r.kernel.org,
        linux-kernel@...r.kernel.org, elder@...aro.org,
        Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>
Subject: [PATCH v4 27/27] 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: Alex Elder <elder@...aro.org>
Signed-off-by: Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>
---
 drivers/bus/mhi/ep/main.c       |  9 +++++++++
 include/linux/mod_devicetable.h |  2 ++
 scripts/mod/file2alias.c        | 10 ++++++++++
 3 files changed, 21 insertions(+)

diff --git a/drivers/bus/mhi/ep/main.c b/drivers/bus/mhi/ep/main.c
index 3efdbf924076..ce59f38b59a7 100644
--- a/drivers/bus/mhi/ep/main.c
+++ b/drivers/bus/mhi/ep/main.c
@@ -1568,6 +1568,14 @@ 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);
@@ -1594,6 +1602,7 @@ 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)
diff --git a/include/linux/mod_devicetable.h b/include/linux/mod_devicetable.h
index 4bb71979a8fd..0cff19bd72bf 100644
--- a/include/linux/mod_devicetable.h
+++ b/include/linux/mod_devicetable.h
@@ -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
diff --git a/scripts/mod/file2alias.c b/scripts/mod/file2alias.c
index 5258247d78ac..d9d6a31446ea 100644
--- a/scripts/mod/file2alias.c
+++ b/scripts/mod/file2alias.c
@@ -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},
-- 
2.25.1