wl1271: Add sysfs file to retrieve HW PG-version and ROM-version

This patch reads the HW PG version (along with a ROM-version, embedded in the
same value) from the wl1271 hardware and publishes the value in a sysfs -file.

Signed-off-by: Juuso Oikarinen <juuso.oikarinen@nokia.com>
Reviewed-by: Luciano Coelho <luciano.coelho@nokia.com>
Signed-off-by: Luciano Coelho <luciano.coelho@nokia.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

1 files changed, 34 insertions, 0 deletions

diff --git a/drivers/net/wireless/wl12xx/wl1271_main.c b/drivers/net/wireless/wl12xx/wl1271_main.c
index b0837255de6f..36dfdee5fbfe 100644
--- a/drivers/net/wireless/wl12xx/wl1271_main.c
+++ b/drivers/net/wireless/wl12xx/wl1271_main.c
@@ -2232,6 +2232,29 @@ static DEVICE_ATTR(bt_coex_state, S_IRUGO | S_IWUSR,
                    wl1271_sysfs_show_bt_coex_state,
                    wl1271_sysfs_store_bt_coex_state);
 
+static ssize_t wl1271_sysfs_show_hw_pg_ver(struct device *dev,
+                                           struct device_attribute *attr,
+                                           char *buf)
+{
+        struct wl1271 *wl = dev_get_drvdata(dev);
+        ssize_t len;
+
+        /* FIXME: what's the maximum length of buf? page size?*/
+        len = 500;
+
+        mutex_lock(&wl->mutex);
+        if (wl->hw_pg_ver >= 0)
+                len = snprintf(buf, len, "%d\n", wl->hw_pg_ver);
+        else
+                len = snprintf(buf, len, "n/a\n");
+        mutex_unlock(&wl->mutex);
+
+        return len;
+}
+
+static DEVICE_ATTR(hw_pg_ver, S_IRUGO | S_IWUSR,
+                   wl1271_sysfs_show_hw_pg_ver, NULL);
+
 int wl1271_register_hw(struct wl1271 *wl)
 {
         int ret;
@@ -2351,6 +2374,7 @@ struct ieee80211_hw *wl1271_alloc_hw(void)
         wl->vif = NULL;
         wl->flags = 0;
         wl->sg_enabled = true;
+        wl->hw_pg_ver = -1;
 
         for (i = 0; i < ACX_TX_DESCRIPTORS; i++)
                 wl->tx_frames[i] = NULL;
@@ -2380,8 +2404,18 @@ struct ieee80211_hw *wl1271_alloc_hw(void)
                 goto err_platform;
         }
 
+        /* Create sysfs file to get HW PG version */
+        ret = device_create_file(&wl->plat_dev->dev, &dev_attr_hw_pg_ver);
+        if (ret < 0) {
+                wl1271_error("failed to create sysfs file hw_pg_ver");
+                goto err_bt_coex_state;
+        }
+
         return hw;
 
+err_bt_coex_state:
+        device_remove_file(&wl->plat_dev->dev, &dev_attr_bt_coex_state);
+
 err_platform:
         platform_device_unregister(wl->plat_dev);