linux-kernel - [PATCH 1/4] firmware: coreboot: Generate modalias uevent for devices

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Message-ID: <20240111151226.842603-2-nfraprado@collabora.com>
Date: Thu, 11 Jan 2024 12:11:46 -0300
From: Nícolas F. R. A. Prado <nfraprado@...labora.com>
To: Tzung-Bi Shih <tzungbi@...nel.org>
Cc: kernel@...labora.com,
	AngeloGioacchino Del Regno <angelogioacchino.delregno@...labora.com>,
	Nícolas F. R. A. Prado <nfraprado@...labora.com>,
	Brian Norris <briannorris@...omium.org>,
	Julius Werner <jwerner@...omium.org>,
	chrome-platform@...ts.linux.dev,
	linux-kernel@...r.kernel.org
Subject: [PATCH 1/4] firmware: coreboot: Generate modalias uevent for devices

Generate a modalias uevent for devices in the coreboot bus to allow
userspace to automatically load the corresponding modules.

Signed-off-by: Nícolas F. R. A. Prado <nfraprado@...labora.com>
---

 drivers/firmware/google/coreboot_table.c | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/drivers/firmware/google/coreboot_table.c b/drivers/firmware/google/coreboot_table.c
index 2a4469bf1b81..c1b9a9e8e8ed 100644
--- a/drivers/firmware/google/coreboot_table.c
+++ b/drivers/firmware/google/coreboot_table.c
@@ -53,11 +53,20 @@ static void coreboot_bus_remove(struct device *dev)
 		driver->remove(device);
 }
 
+static int coreboot_bus_uevent(const struct device *dev, struct kobj_uevent_env *env)
+{
+	struct coreboot_device *device = CB_DEV(dev);
+	u32 tag = device->entry.tag;
+
+	return add_uevent_var(env, "MODALIAS=coreboot:t%08X", tag);
+}
+
 static struct bus_type coreboot_bus_type = {
 	.name		= "coreboot",
 	.match		= coreboot_bus_match,
 	.probe		= coreboot_bus_probe,
 	.remove		= coreboot_bus_remove,
+	.uevent		= coreboot_bus_uevent,
 };
 
 static void coreboot_device_release(struct device *dev)
-- 
2.43.0