2 files changed, 96 insertions, 3 deletions

diff --git a/drivers/base/Kconfig b/drivers/base/Kconfig
index d7da109c24fd..d47482fa1d21 100644
--- a/drivers/base/Kconfig
+++ b/drivers/base/Kconfig
@@ -34,6 +34,70 @@ config FW_LOADER
           require userspace firmware loading support, but a module built outside
           the kernel tree does.
 
+config FIRMWARE_IN_KERNEL
+        bool "Include in-kernel firmware blobs in kernel binary"
+        depends on FW_LOADER
+        default y
+        help
+          The kernel source tree includes a number of firmware 'blobs'
+          which are used by various drivers. The recommended way to
+          use these is to run "make firmware_install" and to copy the
+          resulting binary files created in usr/lib/firmware directory
+          of the kernel tree to the /lib/firmware on your system so
+          that they can be loaded by userspace helpers on request.
+
+          Enabling this option will build each required firmware blob
+          into the kernel directly, where request_firmware() will find
+          them without having to call out to userspace. This may be
+          useful if your root file system requires a device which uses
+          such firmware, and do not wish to use an initrd.
+
+          This single option controls the inclusion of firmware for
+          every driver which usees request_firmare() and ships its
+          firmware in the kernel source tree, to avoid a proliferation
+          of 'Include firmware for xxx device' options.
+
+          Say 'N' and let firmware be loaded from userspace.
+
+config EXTRA_FIRMWARE
+        string "External firmware blobs to build into the kernel binary"
+        depends on FW_LOADER
+        help
+          This option allows firmware to be built into the kernel, for the
+          cases where the user either cannot or doesn't want to provide it from
+          userspace at runtime (for example, when the firmware in question is
+          required for accessing the boot device, and the user doesn't want to
+          use an initrd).
+
+          This option is a string, and takes the (space-separated) names of the
+          firmware files -- the same names which appear in MODULE_FIRMWARE()
+          and request_firmware() in the source. These files should exist under
+          the directory specified by the EXTRA_FIRMWARE_DIR option, which is
+          by default the firmware/ subdirectory of the kernel source tree.
+
+          So, for example, you might set CONFIG_EXTRA_FIRMWARE="usb8388.bin",
+          copy the usb8388.bin file into the firmware/ directory, and build the
+          kernel. Then any request_firmware("usb8388.bin") will be
+          satisfied internally without needing to call out to userspace.
+
+          WARNING: If you include additional firmware files into your binary
+          kernel image which are not available under the terms of the GPL,
+          then it may be a violation of the GPL to distribute the resulting
+          image -- since it combines both GPL and non-GPL work. You should
+          consult a lawyer of your own before distributing such an image.
+
+config EXTRA_FIRMWARE_DIR
+        string "Firmware blobs root directory"
+        depends on EXTRA_FIRMWARE != ""
+        default "firmware"
+        help
+          This option controls the directory in which the kernel build system
+          looks for the firmware files listed in the EXTRA_FIRMWARE option.
+          The default is the firmware/ directory in the kernel source tree,
+          but by changing this option you can point it elsewhere, such as
+          the /lib/firmware/ directory or another separate directory
+          containing firmware files.
+
 config DEBUG_DRIVER
         bool "Driver Core verbose debug messages"
         depends on DEBUG_KERNEL
diff --git a/drivers/base/firmware_class.c b/drivers/base/firmware_class.c
index 9fd4a8534146..b0be1d18fee2 100644
--- a/drivers/base/firmware_class.c
+++ b/drivers/base/firmware_class.c
@@ -49,6 +49,14 @@ struct firmware_priv {
         struct timer_list timeout;
 };
 
+#ifdef CONFIG_FW_LOADER
+extern struct builtin_fw __start_builtin_fw[];
+extern struct builtin_fw __end_builtin_fw[];
+#else /* Module case. Avoid ifdefs later; it'll all optimise out */
+static struct builtin_fw *__start_builtin_fw;
+static struct builtin_fw *__end_builtin_fw;
+#endif
+
 static void
 fw_load_abort(struct firmware_priv *fw_priv)
 {
@@ -257,7 +265,7 @@ firmware_data_write(struct kobject *kobj, struct bin_attribute *bin_attr,
         if (retval)
                 goto out;
 
-        memcpy(fw->data + offset, buffer, count);
+        memcpy((u8 *)fw->data + offset, buffer, count);
 
         fw->size = max_t(size_t, offset + count, fw->size);
         retval = count;
@@ -391,13 +399,12 @@ _request_firmware(const struct firmware **firmware_p, const char *name,
         struct device *f_dev;
         struct firmware_priv *fw_priv;
         struct firmware *firmware;
+        struct builtin_fw *builtin;
         int retval;
 
         if (!firmware_p)
                 return -EINVAL;
 
-        printk(KERN_INFO "firmware: requesting %s\n", name);
-
         *firmware_p = firmware = kzalloc(sizeof(*firmware), GFP_KERNEL);
         if (!firmware) {
                 printk(KERN_ERR "%s: kmalloc(struct firmware) failed\n",
@@ -406,6 +413,20 @@ _request_firmware(const struct firmware **firmware_p, const char *name,
                 goto out;
         }
 
+        for (builtin = __start_builtin_fw; builtin != __end_builtin_fw;
+             builtin++) {
+                if (strcmp(name, builtin->name))
+                        continue;
+                printk(KERN_INFO "firmware: using built-in firmware %s\n",
+                       name);
+                firmware->size = builtin->size;
+                firmware->data = builtin->data;
+                return 0;
+        }
+
+        if (uevent)
+                printk(KERN_INFO "firmware: requesting %s\n", name);
+
         retval = fw_setup_device(firmware, &f_dev, name, device, uevent);
         if (retval)
                 goto error_kfree_fw;
@@ -473,8 +494,16 @@ request_firmware(const struct firmware **firmware_p, const char *name,
 void
 release_firmware(const struct firmware *fw)
 {
+        struct builtin_fw *builtin;
+
         if (fw) {
+                for (builtin = __start_builtin_fw; builtin != __end_builtin_fw;
+                     builtin++) {
+                        if (fw->data == builtin->data)
+                                goto free_fw;
+                }
                 vfree(fw->data);
+        free_fw:
                 kfree(fw);
         }
 }