This is a note to let you know that I've just added the patch titled
Subject: platform_bus learns about modalias
to my gregkh-2.6 tree. Its filename is
platform_bus-learns-about-modalias.patch
This tree can be found at
http://www.kernel.org/pub/linux/kernel/people/gregkh/gregkh-2.6/patches/
>From [email protected] Mon May 1 14:05:05 2006
From: David Brownell <[email protected]>
To: Greg KH <[email protected]>
Subject: platform_bus learns about modalias
Date: Mon, 1 May 2006 11:16:01 -0700
Cc: Russell King <[email protected]>,
Linux Kernel list <[email protected]>
Message-Id: <[email protected]>
This patch adds modalias support to platform devices, for simpler
hotplug/coldplug driven driver setup.
Signed-off-by: David Brownell <[email protected]>
Signed-off-by: Greg Kroah-Hartman <[email protected]>
---
drivers/base/platform.c | 36 ++++++++++++++++++++++++++++++++++++
1 file changed, 36 insertions(+)
--- gregkh-2.6.orig/drivers/base/platform.c
+++ gregkh-2.6/drivers/base/platform.c
@@ -452,6 +452,40 @@ void platform_driver_unregister(struct p
EXPORT_SYMBOL_GPL(platform_driver_unregister);
+/* modalias support enables more hands-off userspace setup:
+ * (a) environment variable lets new-style hotplug events work once system is
+ * fully running: "modprobe $MODALIAS"
+ * (b) sysfs attribute lets new-style coldplug recover from hotplug events
+ * mishandled before system is fully running: "modprobe $(cat modalias)"
+ */
+static ssize_t
+modalias_show(struct device *dev, struct device_attribute *a, char *buf)
+{
+ struct platform_device *pdev = to_platform_device(dev);
+ unsigned len = strlen(pdev->name);
+
+ len = min(len, (size_t)(PAGE_SIZE - 1));
+ memcpy(buf, pdev->name, len);
+ buf[PAGE_SIZE - 1] = 0;
+ return len;
+}
+
+static struct device_attribute platform_dev_attrs[] = {
+ __ATTR_RO(modalias),
+ __ATTR_NULL,
+};
+
+static int platform_uevent(struct device *dev, char **envp, int num_envp,
+ char *buffer, int buffer_size)
+{
+ struct platform_device *pdev = to_platform_device(dev);
+
+ envp[0] = buffer;
+ snprintf(buffer, buffer_size, "MODALIAS=%s", pdev->name);
+ return 0;
+}
+
+
/**
* platform_match - bind platform device to platform driver.
* @dev: device.
@@ -496,7 +530,9 @@ static int platform_resume(struct device
struct bus_type platform_bus_type = {
.name = "platform",
+ .dev_attrs = platform_dev_attrs,
.match = platform_match,
+ .uevent = platform_uevent,
.suspend = platform_suspend,
.resume = platform_resume,
};
Patches currently in gregkh-2.6 which might be from [email protected] are
driver/spi-add-david-as-the-spi-subsystem-maintainer.patch
driver/platform_bus-learns-about-modalias.patch
driver/spi-spi_bitbang-clocking-fixes.patch
driver/driver-core-config_debug_pm-covers-drivers-base-power-too.patch
driver/spi-busnum-0-needs-to-work.patch
driver/spi-devices-can-require-lsb-first-encodings.patch
driver/spi-renamed-bitbang_transfer_setup-to-spi_bitbang_setup_transfer-and-export-it.patch
driver/spi-spi-bounce-buffer-has-a-minimum-length.patch
driver/spi-spi-whitespace-fixes.patch
driver/spi-add-pxa2xx-ssp-spi-driver.patch
driver/spi-per-transfer-overrides-for-wordsize-and-clocking.patch
usb/usb-pegasus-fixes.patch
usb/usb-allow-multiple-types-of-ehci-controllers-to-be-built-as-modules.patch
usb/usb-fix-bug-in-ohci-hcd.c-ohci_restart.patch
usb/usb-usbcore-always-turn-on-hub-port-power.patch
-
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