linux-kernel - [PATCH v4 1/4] firmware: coreboot: Generate modalias uevent for devices

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Message-Id: <20240212-coreboot-mod-defconfig-v4-1-d14172676f6d@collabora.com>
Date: Mon, 12 Feb 2024 09:50:05 -0500
From: Nícolas F. R. A. Prado <nfraprado@...labora.com>
To: Tzung-Bi Shih <tzungbi@...nel.org>
Cc: Arnd Bergmann <arnd@...db.de>, Brian Norris <briannorris@...omium.org>, 
 Julius Werner <jwerner@...omium.org>, 
 Masahiro Yamada <masahiroy@...nel.org>, 
 Nathan Chancellor <nathan@...nel.org>, Nicolas Schier <nicolas@...sle.eu>, 
 Catalin Marinas <catalin.marinas@....com>, Will Deacon <will@...nel.org>, 
 AngeloGioacchino Del Regno <angelogioacchino.delregno@...labora.com>, 
 Andy Shevchenko <andriy.shevchenko@...ux.intel.com>, 
 Greg Kroah-Hartman <gregkh@...uxfoundation.org>, kernel@...labora.com, 
 chrome-platform@...ts.linux.dev, linux-kernel@...r.kernel.org, 
 linux-kbuild@...r.kernel.org, linux-arm-kernel@...ts.infradead.org, 
 Nícolas F. R. A. Prado <nfraprado@...labora.com>
Subject: [PATCH v4 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.

Acked-by: Brian Norris <briannorris@...omium.org>
Reviewed-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@...labora.com>
Reviewed-by: Brian Norris <briannorris@...omium.org>
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