a78ef2ccf
Mike Frysinger
2007-06-13
Subject
add support for firmware loading
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util-linux/Config.in+11 -0
| @@ -294,6 +294,17 @@ config FEATURE_MDEV_EXEC | |
| For more information, please see docs/mdev.txt | |
| + | config FEATURE_MDEV_LOAD_FIRMWARE |
| + | bool "Support loading of firmwares" |
| + | default n |
| + | depends on MDEV |
| + | help |
| + | Some devices need to load firmware before they can be usable. |
| + | |
| + | These devices will request userspace look up the files in |
| + | /lib/firmware/ and if it exists, send it to the kernel for |
| + | loading into the hardware. |
| + | |
| config MKSWAP | |
| bool "mkswap" | |
| default n | |
util-linux/mdev.c+73 -2
| @@ -226,6 +226,71 @@ static void find_dev(char *path) | |
| closedir(dir); | |
| } | |
| + | /* For the full gory details, see linux/Documentation/firmware_class/README |
| + | * |
| + | * Firmware loading works like this: |
| + | * - kernel sets FIRMWARE env var |
| + | * - userspace checks /lib/firmware/$FIRMWARE |
| + | * - userspace waits for /sys/$DEVPATH/loading to appear |
| + | * - userspace writes "1" to /sys/$DEVPATH/loading |
| + | * - userspace copies /lib/firmware/$FIRMWARE into /sys/$DEVPATH/data |
| + | * - userspace writes "0" (worked) or "-1" (failed) to /sys/$DEVPATH/loading |
| + | * - kernel loads firmware into device |
| + | */ |
| + | static inline void load_firmware(const char * const firmware, const char * const sysfs_path) |
| + | { |
| + | int cnt; |
| + | int firmware_fd, loading_fd, data_fd; |
| + | |
| + | /* check for $FIRMWARE from kernel */ |
| + | /* XXX: dont bother: open(NULL) works same as open("no-such-file") |
| + | * if (!firmware) |
| + | * return; |
| + | */ |
| + | |
| + | /* check for /lib/firmware/$FIRMWARE */ |
| + | xchdir("/lib/firmware"); |
| + | firmware_fd = xopen(firmware, O_WRONLY); |
| + | |
| + | /* in case we goto out ... */ |
| + | data_fd = -1; |
| + | |
| + | /* check for /sys/$DEVPATH/loading ... give 30 seconds to appear */ |
| + | xchdir(sysfs_path); |
| + | for (cnt = 0; cnt < 30; ++cnt) { |
| + | loading_fd = open("loading", O_WRONLY); |
| + | if (loading_fd == -1) |
| + | sleep(1); |
| + | else |
| + | break; |
| + | } |
| + | if (loading_fd == -1) |
| + | goto out; |
| + | |
| + | /* tell kernel we're loading by `echo 1 > /sys/$DEVPATH/loading` */ |
| + | if (write(loading_fd, "1", 1) != 1) |
| + | goto out; |
| + | |
| + | /* load firmware by `cat /lib/firmware/$FIRMWARE > /sys/$DEVPATH/data */ |
| + | data_fd = open("data", O_WRONLY); |
| + | if (data_fd == -1) |
| + | goto out; |
| + | cnt = bb_copyfd_eof(firmware_fd, data_fd); |
| + | |
| + | /* tell kernel result by `echo [0|-1] > /sys/$DEVPATH/loading` */ |
| + | if (cnt > 0) |
| + | write(loading_fd, "0", 1); |
| + | else |
| + | write(loading_fd, "-1", 2); |
| + | |
| + | out: |
| + | if (ENABLE_FEATURE_CLEAN_UP) { |
| + | close(firmware_fd); |
| + | close(loading_fd); |
| + | close(data_fd); |
| + | } |
| + | } |
| + | |
| int mdev_main(int argc, char **argv); | |
| int mdev_main(int argc, char **argv) | |
| { | |
| @@ -257,8 +322,14 @@ int mdev_main(int argc, char **argv) | |
| bb_show_usage(); | |
| sprintf(temp, "/sys%s", env_path); | |
| - | if (!strcmp(action, "add")) make_device(temp,0); |
| - | else if (!strcmp(action, "remove")) make_device(temp,1); |
| + | if (!strcmp(action, "remove")) |
| + | make_device(temp, 1); |
| + | else if (!strcmp(action, "add")) { |
| + | make_device(temp, 0); |
| + | |
| + | if (ENABLE_FEATURE_MDEV_LOAD_FIRMWARE) |
| + | load_firmware(getenv("FIRMWARE"), temp); |
| + | } |
| } | |
| if (ENABLE_FEATURE_CLEAN_UP) RELEASE_CONFIG_BUFFER(temp); | |