[PATCH 6/7] usb: typec: ucsi: add check for supported vendor

[Ajay Gupta]

Added check to see the currently flashed or new firmware being
flashed is from a supported vendor.

Signed-off-by: Ajay Gupta <aj...@nvidia.com>
---
 drivers/usb/typec/ucsi/ucsi_ccg.c | 28 ++++++++++++++++++++++++++++
 1 file changed, 28 insertions(+)

diff --git a/drivers/usb/typec/ucsi/ucsi_ccg.c 
b/drivers/usb/typec/ucsi/ucsi_ccg.c
index 6069a9f60d1e..1aa6ede764b5 100644
--- a/drivers/usb/typec/ucsi/ucsi_ccg.c
+++ b/drivers/usb/typec/ucsi/ucsi_ccg.c
@@ -775,6 +775,30 @@ static int ccg_cmd_validate_fw(struct ucsi_ccg *uc, 
unsigned int fwid)
        return 0;
 }
 
+static bool ccg_check_vendor_version(struct ucsi_ccg *uc,
+                                    struct version_format *app,
+                                    struct fw_config_table *fw_cfg)
+{
+       struct device *dev = uc->dev;
+
+       /* Check if the fw build is for supported vendors.
+        * Add all supported vendors here.
+        */
+       if (app->build != (('n' << 8) | 'v')) {
+               dev_info(dev, "current fw is not from supported vendor\n");
+               return false;
+       }
+
+       /* Check if the new fw build is for supported vendors
+        * Add all supported vendors here.
+        */
+       if (fw_cfg->app.build != (('n' << 8) | 'v')) {
+               dev_info(dev, "new fw is not from supported vendor\n");
+               return false;
+       }
+       return true;
+}
+
 static bool ccg_check_fw_version(struct ucsi_ccg *uc, const char *fw_name,
                                 struct version_format *app)
 {
@@ -814,6 +838,9 @@ static bool ccg_check_fw_version(struct ucsi_ccg *uc, const 
char *fw_name,
        dev_dbg(dev, "compare current %08x and new version %08x\n",
                cur_version, new_version);
 
+       if (!ccg_check_vendor_version(uc, app, &fw_cfg))
+               goto not_supported_version;
+
        if (new_version > cur_version) {
                dev_dbg(dev, "new firmware file version is later\n");
                is_later = true;
@@ -821,6 +848,7 @@ static bool ccg_check_fw_version(struct ucsi_ccg *uc, const 
char *fw_name,
                dev_dbg(dev, "new firmware file version is same or earlier\n");
        }
 
+not_supported_version:
 not_signed_fw:
        release_firmware(fw);
        return is_later;
-- 
2.17.1