Messages in this thread Patch in this message | | | Date | Sat, 8 Jul 2006 15:09:04 +0200 | From | Martin Langer <> | Subject | [RFC][PATCH 1/2] firmware version management: add firmware_version() |
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It would be good if a driver knows which firmware version will be written to the hardware. I'm talking about external firmware files claimed by request_firmware().
We know so many different firmware files for bcm43xx and it becomes more and more complicated without some firmware version management.
This patch can create the md5sum of a firmware file. Then it looks into a table to figure out which version number is assigned to the hashcode. That table is placed in the driver code and an example for bcm43xx comes in my next mail. Any comments?
Signed-off-by: Martin Langer <martin-langer@gmx.de>
--- ../linux-2.6.18rc1/drivers/base/firmware_class.c 2006-07-07 13:41:01.000000000 +0200 +++ drivers/base/firmware_class.c 2006-07-07 14:39:15.000000000 +0200 @@ -16,6 +16,8 @@ #include <linux/interrupt.h> #include <linux/bitops.h> #include <linux/mutex.h> +#include <linux/scatterlist.h> +#include <linux/crypto.h> #include <linux/firmware.h> #include "base.h" @@ -48,6 +50,32 @@ struct timer_list timeout; }; +u32 firmware_version(const struct firmware *fw, struct firmware_files *elmnt) +{ + struct scatterlist sg; + struct crypto_tfm *tfm; + char sig[16]; + + tfm = crypto_alloc_tfm("md5", 0); + if (tfm == NULL) + return 0; + + sg_init_one(&sg, fw->data, fw->size); + + crypto_digest_init(tfm); + crypto_digest_update(tfm, &sg, 1); + crypto_digest_final(tfm, sig); + crypto_free_tfm(tfm); + + while (elmnt->version) { + if (memcmp(sig, elmnt->signature, sizeof(sig)) == 0) + return elmnt->version; + elmnt++; + } + + return 0; +} + static void fw_load_abort(struct firmware_priv *fw_priv) { @@ -605,6 +633,7 @@ module_init(firmware_class_init); module_exit(firmware_class_exit); +EXPORT_SYMBOL(firmware_version); EXPORT_SYMBOL(release_firmware); EXPORT_SYMBOL(request_firmware); EXPORT_SYMBOL(request_firmware_nowait); --- ../linux-2.6.18rc1/include/linux/firmware.h 2006-06-18 03:49:35.000000000 +0200 +++ include/linux/firmware.h 2006-07-08 13:36:36.000000000 +0200 @@ -10,7 +10,12 @@ size_t size; u8 *data; }; +struct firmware_files { + u8 signature[16]; + u32 version; +}; struct device; +u32 firmware_version(const struct firmware *fw, struct firmware_files *elmnt); int request_firmware(const struct firmware **fw, const char *name, struct device *device); int request_firmware_nowait( --- ../linux-2.6.18rc1/drivers/base/Kconfig 2006-07-07 13:41:01.000000000 +0200 +++ drivers/base/Kconfig 2006-07-07 14:34:23.000000000 +0200 @@ -21,6 +21,7 @@ config FW_LOADER tristate "Userspace firmware loading support" select HOTPLUG + select CRYPTO_MD5 ---help--- This option is provided for the case where no in-kernel-tree modules require userspace firmware loading support, but a module built outside - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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