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From: Anton Farygin <rider@altlinux.com>
Organization: ALT Linux Ltd.
Date: Thu, 21 Jul 2005 09:55:15 +0400
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Subject: [devel] [gmane.linux.hotplug.devel] [code] simple udev helper for
	firmware loading
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А нам такое надо ?

Мне проверят не на чем... кто-то у нас firmware использует ?

Rgds,
Rider


On Wed, 20 Jul 2005 23:33:05 -0400, Bill Nottingham wrote:

> As part of the move to newer udev releases, we've been getting rid of
> various hotplug agents instead of udev rules. While some (pci, scsi, usb)
> are simple transforms, firmware loading still needs a helper.
> 
> Kay asked me to pass this along, so here it is.
> 
> Compile is simply:
> 	gcc -options_of_choice -o firmware_helper firmware_helper.c
> 
> It's invoked via a udev rule as such:
> 
> ACTION=="add", SUBSYSTEM=="firmware", FIRMWARE="*", \
>         RUN+="/sbin/firmware_helper"
> 
> Potential improvements:
> - better logging of errors
> - support for sysfs mounted somewhere other than /sys (port to libsysfs?)
> 
> But it should work fine as-is. Well, barring the inevitable bugs.
> 
> Bill/*
>  * A simple firmware helper program.
>  *
>  * Copyright 2005 Red Hat, Inc.
>  *
>  * This software may be freely redistributed under the terms of the GNU *
>  public license.
>  *
>  * You should have received a copy of the GNU General Public License *
>  along with this program; if not, write to the Free Software * Foundation,
>  Inc., 675 Mass Ave, Cambridge, MA 02139, USA. *
>  */
> 
> #include <errno.h>
> #include <fcntl.h>
> #include <stdio.h>
> #include <stdlib.h>
> #include <string.h>
> #include <syslog.h>
> #include <unistd.h>
> 
> #include <sys/stat.h>
> 
> #define FIRMWARE_PATH	"/lib/firmware"
> 
> 
> void log_err(char *firmware, int err) {
> 	char *driver;
> 	
> 	driver = getenv("PHYSDEVDRIVER");
> 	if (!driver)
> 		driver = "(unknown)";
> 	openlog("firmware_helper",LOG_PID,LOG_USER); syslog(LOG_ERR,"Loading of
> 	%s for %s driver failed: %s",firmware, driver, strerror(err));
> 	closelog();
> }
> }
> /* Set the 'loading' attribute for a firmware device.
>  * 1 == currently loading
>  * 0 == done loading
>  * -1 == error
>  */
> int set_loading(char *device, int value) {
> 	char *path;
> 	int rc;
> 	FILE *f;
> 	
> 	path = alloca(strlen(device)+15);
> 	sprintf(path,"/sys/%s/loading", device); f = fopen(path, "w");
> 	if (!f)
> 		return 1;
> 	rc = fprintf(f, "%d", value);
> 	fclose(f);
> 	if (rc < 0)
> 		return rc;
> 	return 0;
> }
> }
> 	
> int main(int argc, char **argv) {
> 	char *devpath, *firmware, *action;
> 	struct stat sbuf;
> 	int fw_fd, count;
> 	int rc;
> 	char *fw_path, *data_path;
> 	char *fw_buffer;
> 	
> 	devpath = getenv("DEVPATH");
> 	if (!devpath) return 0;
> 	
> 	firmware = getenv("FIRMWARE");
> 	if (!firmware) return 0;
> 	
> 	action = getenv("ACTION");
> 	if (strcmp(action,"add"))
> 		return 0;
> 
> 	set_loading(devpath, 1);
> 	
> 	fw_path = malloc(strlen(FIRMWARE_PATH) + strlen(firmware) + 2); if
> 	(!fw_path) {
> 		rc = errno;
> 		goto out_err;
> 	}
> 	}
> 	sprintf(fw_path,"%s/%s", FIRMWARE_PATH, firmware); fw_fd = open(fw_path,
> 	O_RDONLY);
> 	if (fw_fd == -1) {
> 		rc = errno;
> 		goto out_err;
> 	}
> 	}
> 	fstat(fw_fd, &sbuf);
> 	fw_buffer = malloc(sbuf.st_size);
> 	if (!fw_buffer) {
> 		rc = errno;
> 		goto out_err;
> 	}
> 	if (read(fw_fd, fw_buffer, sbuf.st_size) != sbuf.st_size) {
> 		rc = errno;
> 		goto out_err;
> 	}
> 	close(fw_fd);
> 	
> 	data_path = malloc(strlen(devpath) + 12); if (!data_path) {
> 		rc = errno;
> 		goto out_err;
> 	}
> 	}
> 	sprintf(data_path,"/sys/%s/data", devpath);
> 	
> 	fw_fd = open(data_path, O_RDWR);
> 	if (fw_fd == -1) {
> 		rc = errno;
> 		goto out_err;
> 	}
> 	}
> 	count = 0;
> 	while (count < sbuf.st_size) {
> 		int c;
> 		
> 		c = write(fw_fd,fw_buffer+count,sbuf.st_size-count); if (c <= 0) {
> 			rc = errno;
> 			goto out_err;
> 		}
> 		count += c;
> 	}
> 	close(fw_fd);
> 	set_loading(devpath, 0);
> 	return 0;
> out_err:
> 	close(fw_fd);
> 	set_loading(devpath, -1);
> 	log_err(fw_path, rc);
> 	return rc;
> }