wlcore/wl12xx/wl18xx: check min FW version

Refuse to boot if the FW version is too old. The minimum version is set
per chip, with the option of setting it per PG in the future.

When boot fails because of an old FW, display a helpful message.

Signed-off-by: Arik Nemtsov <arik@wizery.com>
Signed-off-by: Luciano Coelho <coelho@ti.com>

2 files changed, 66 insertions, 0 deletions

diff --git a/drivers/net/wireless/ti/wlcore/boot.c b/drivers/net/wireless/ti/wlcore/boot.c
index 8965960b841a..61113291a890 100644
--- a/drivers/net/wireless/ti/wlcore/boot.c
+++ b/drivers/net/wireless/ti/wlcore/boot.c
@@ -81,6 +81,53 @@ out:
         return ret;
 }
 
+static int wlcore_validate_fw_ver(struct wl1271 *wl)
+{
+        unsigned int *fw_ver = wl->chip.fw_ver;
+        unsigned int *min_ver = wl->min_fw_ver;
+
+        /* the chip must be exactly equal */
+        if (min_ver[FW_VER_CHIP] != fw_ver[FW_VER_CHIP])
+                goto fail;
+
+        /* always check the next digit if all previous ones are equal */
+
+        if (min_ver[FW_VER_IF_TYPE] < fw_ver[FW_VER_IF_TYPE])
+                goto out;
+        else if (min_ver[FW_VER_IF_TYPE] > fw_ver[FW_VER_IF_TYPE])
+                goto fail;
+
+        if (min_ver[FW_VER_MAJOR] < fw_ver[FW_VER_MAJOR])
+                goto out;
+        else if (min_ver[FW_VER_MAJOR] > fw_ver[FW_VER_MAJOR])
+                goto fail;
+
+        if (min_ver[FW_VER_SUBTYPE] < fw_ver[FW_VER_SUBTYPE])
+                goto out;
+        else if (min_ver[FW_VER_SUBTYPE] > fw_ver[FW_VER_SUBTYPE])
+                goto fail;
+
+        if (min_ver[FW_VER_MINOR] < fw_ver[FW_VER_MINOR])
+                goto out;
+        else if (min_ver[FW_VER_MINOR] > fw_ver[FW_VER_MINOR])
+                goto fail;
+
+out:
+        return 0;
+
+fail:
+        wl1271_error("Your WiFi FW version (%u.%u.%u.%u.%u) is outdated.\n"
+                     "Please use at least FW %u.%u.%u.%u.%u.\n"
+                     "You can get more information at:\n"
+                     "http://wireless.kernel.org/en/users/Drivers/wl12xx",
+                     fw_ver[FW_VER_CHIP], fw_ver[FW_VER_IF_TYPE],
+                     fw_ver[FW_VER_MAJOR], fw_ver[FW_VER_SUBTYPE],
+                     fw_ver[FW_VER_MINOR], min_ver[FW_VER_CHIP],
+                     min_ver[FW_VER_IF_TYPE], min_ver[FW_VER_MAJOR],
+                     min_ver[FW_VER_SUBTYPE], min_ver[FW_VER_MINOR]);
+        return -EINVAL;
+}
+
 static int wlcore_boot_static_data(struct wl1271 *wl)
 {
         struct wl1271_static_data *static_data;
@@ -101,6 +148,10 @@ static int wlcore_boot_static_data(struct wl1271 *wl)
         if (ret < 0)
                 goto out_free;
 
+        ret = wlcore_validate_fw_ver(wl);
+        if (ret < 0)
+                goto out_free;
+
         ret = wlcore_handle_static_data(wl, static_data);
         if (ret < 0)
                 goto out_free;
diff --git a/drivers/net/wireless/ti/wlcore/wlcore.h b/drivers/net/wireless/ti/wlcore/wlcore.h
index 216bdb0f2756..942cef13d8f4 100644
--- a/drivers/net/wireless/ti/wlcore/wlcore.h
+++ b/drivers/net/wireless/ti/wlcore/wlcore.h
@@ -390,6 +390,9 @@ struct wl1271 {
 
         /* sleep auth value currently configured to FW */
         int sleep_auth;
+
+        /* the minimum FW version required for the driver to work */
+        unsigned int min_fw_ver[NUM_FW_VER];
 };
 
 int __devinit wlcore_probe(struct wl1271 *wl, struct platform_device *pdev);
@@ -408,6 +411,18 @@ wlcore_set_ht_cap(struct wl1271 *wl, enum ieee80211_band band,
         memcpy(&wl->ht_cap[band], ht_cap, sizeof(*ht_cap));
 }
 
+static inline void
+wlcore_set_min_fw_ver(struct wl1271 *wl, unsigned int chip,
+                      unsigned int iftype, unsigned int major,
+                      unsigned int subtype, unsigned int minor)
+{
+        wl->min_fw_ver[FW_VER_CHIP] = chip;
+        wl->min_fw_ver[FW_VER_IF_TYPE] = iftype;
+        wl->min_fw_ver[FW_VER_MAJOR] = major;
+        wl->min_fw_ver[FW_VER_SUBTYPE] = subtype;
+        wl->min_fw_ver[FW_VER_MINOR] = minor;
+}
+
 /* Firmware image load chunk size */
 #define CHUNK_SIZE      16384