get buffer size from driver

Signed-off-by: Bjørn Mork <bjorn@mork.no>

diff --git a/mbim-dev.c b/mbim-dev.c
index 34bb2c2..dd1110d 100644 (file)
--- a/mbim-dev.c
+++ b/mbim-dev.c
@@ -12,6 +12,8 @@
  * GNU General Public License for more details.
  */
 
+#include <linux/usb/cdc-wdm.h>
+#include <sys/ioctl.h>
 #include <sys/types.h>
 #include <sys/stat.h>
 
@@ -132,13 +134,20 @@ mbim_recv(struct uloop_fd *u, unsigned int events)
 void
 mbim_open(const char *path)
 {
+       __u16 max;
+       int rc;
+
        mbim_fd.cb = mbim_recv;
        mbim_fd.fd = open(path, O_RDWR);
        if (mbim_fd.fd < 1) {
                perror("open failed: ");
                exit(-1);
        }
-       mbim_bufsize = MBIM_BUFFER_SIZE;
+       rc = ioctl(mbim_fd.fd, IOCTL_WDM_MAX_COMMAND, &max);
+       if (!rc)
+               mbim_bufsize = max;
+       else
+               mbim_bufsize = 512;
        mbim_buffer = malloc(mbim_bufsize);
        uloop_fd_add(&mbim_fd, ULOOP_READ);
 }