libertas: improve function init/shutdown handling for SD8688

This patch is to incorporate Dan Williams' comments for commit:
"libertas: implement function init/shutdown commands for SD8688"

1. remove fn_init_required and fn_shutdown_required variables from
lbs_private structure. If required, __lbs_cmd() will be called
directly to send function init/shutdown command for SD8688 in
if_sdio_probe() or if_sdio_remove() callback.

2. add global variable "user_rmmod" to distinguish between the module
removal case and the card removal case. This flag will be checked in
if_sdio_remove() against SD8688 card to determine whether or not the
function shutdown command needs to be sent.

3. remove "card" from if_sdio_model structure as it cannot store
card pointers for multiple cards. Besides, it's no longer needed
to store the "card" pointer with changes #1 & #2 above.

Signed-off-by: Bing Zhao <bzhao@marvell.com>
Acked-by: Dan Williams <dcbw@redhat.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

1 files changed, 47 insertions, 29 deletions

diff --git a/drivers/net/wireless/libertas/if_sdio.c b/drivers/net/wireless/libertas/if_sdio.c
index a7e3fc119b70..8cdb88c6ca28 100644
--- a/drivers/net/wireless/libertas/if_sdio.c
+++ b/drivers/net/wireless/libertas/if_sdio.c
@@ -39,8 +39,24 @@
 #include "decl.h"
 #include "defs.h"
 #include "dev.h"
+#include "cmd.h"
 #include "if_sdio.h"
 
+/* The if_sdio_remove() callback function is called when
+ * user removes this module from kernel space or ejects
+ * the card from the slot. The driver handles these 2 cases
+ * differently for SD8688 combo chip.
+ * If the user is removing the module, the FUNC_SHUTDOWN
+ * command for SD8688 is sent to the firmware.
+ * If the card is removed, there is no need to send this command.
+ *
+ * The variable 'user_rmmod' is used to distinguish these two
+ * scenarios. This flag is initialized as FALSE in case the card
+ * is removed, and will be set to TRUE for module removal when
+ * module_exit function is called.
+ */
+static u8 user_rmmod;
+
 static char *lbs_helper_name = NULL;
 module_param_named(helper_name, lbs_helper_name, charp, 0644);
 
@@ -61,7 +77,6 @@ struct if_sdio_model {
         int model;
         const char *helper;
         const char *firmware;
-        struct if_sdio_card *card;
 };
 
 static struct if_sdio_model if_sdio_models[] = {
@@ -70,21 +85,18 @@ static struct if_sdio_model if_sdio_models[] = {
                 .model = IF_SDIO_MODEL_8385,
                 .helper = "sd8385_helper.bin",
                 .firmware = "sd8385.bin",
-                .card = NULL,
         },
         {
                 /* 8686 */
                 .model = IF_SDIO_MODEL_8686,
                 .helper = "sd8686_helper.bin",
                 .firmware = "sd8686.bin",
-                .card = NULL,
         },
         {
                 /* 8688 */
                 .model = IF_SDIO_MODEL_8688,
                 .helper = "sd8688_helper.bin",
                 .firmware = "sd8688.bin",
-                .card = NULL,
         },
 };
 
@@ -927,8 +939,6 @@ static int if_sdio_probe(struct sdio_func *func,
                 goto free;
         }
 
-        if_sdio_models[i].card = card;
-
         card->helper = if_sdio_models[i].helper;
         card->firmware = if_sdio_models[i].firmware;
 
@@ -1014,8 +1024,16 @@ static int if_sdio_probe(struct sdio_func *func,
         /*
          * FUNC_INIT is required for SD8688 WLAN/BT multiple functions
          */
-        priv->fn_init_required =
-                (card->model == IF_SDIO_MODEL_8688) ? 1 : 0;
+        if (card->model == IF_SDIO_MODEL_8688) {
+                struct cmd_header cmd;
+
+                memset(&cmd, 0, sizeof(cmd));
+
+                lbs_deb_sdio("send function INIT command\n");
+                if (__lbs_cmd(priv, CMD_FUNC_INIT, &cmd, sizeof(cmd),
+                                lbs_cmd_copyback, (unsigned long) &cmd))
+                        lbs_pr_alert("CMD_FUNC_INIT cmd failed\n");
+        }
 
         ret = lbs_start_card(priv);
         if (ret)
@@ -1057,30 +1075,39 @@ static void if_sdio_remove(struct sdio_func *func)
 {
         struct if_sdio_card *card;
         struct if_sdio_packet *packet;
-        int ret;
 
         lbs_deb_enter(LBS_DEB_SDIO);
 
         card = sdio_get_drvdata(func);
 
-        lbs_stop_card(card->priv);
+        if (user_rmmod && (card->model == IF_SDIO_MODEL_8688)) {
+                /*
+                 * FUNC_SHUTDOWN is required for SD8688 WLAN/BT
+                 * multiple functions
+                 */
+                struct cmd_header cmd;
+
+                memset(&cmd, 0, sizeof(cmd));
+
+                lbs_deb_sdio("send function SHUTDOWN command\n");
+                if (__lbs_cmd(card->priv, CMD_FUNC_SHUTDOWN,
+                                &cmd, sizeof(cmd), lbs_cmd_copyback,
+                                (unsigned long) &cmd))
+                        lbs_pr_alert("CMD_FUNC_SHUTDOWN cmd failed\n");
+        }
 
         card->priv->surpriseremoved = 1;
 
         lbs_deb_sdio("call remove card\n");
+        lbs_stop_card(card->priv);
         lbs_remove_card(card->priv);
 
         flush_workqueue(card->workqueue);
         destroy_workqueue(card->workqueue);
 
         sdio_claim_host(func);
-
-        /* Disable interrupts */
-        sdio_writeb(func, 0x00, IF_SDIO_H_INT_MASK, &ret);
-
         sdio_release_irq(func);
         sdio_disable_func(func);
-
         sdio_release_host(func);
 
         while (card->packets) {
@@ -1116,6 +1143,9 @@ static int __init if_sdio_init_module(void)
 
         ret = sdio_register_driver(&if_sdio_driver);
 
+        /* Clear the flag in case user removes the card. */
+        user_rmmod = 0;
+
         lbs_deb_leave_args(LBS_DEB_SDIO, "ret %d", ret);
 
         return ret;
@@ -1123,22 +1153,10 @@ static int __init if_sdio_init_module(void)
 
 static void __exit if_sdio_exit_module(void)
 {
-        int i;
-        struct if_sdio_card *card;
-
         lbs_deb_enter(LBS_DEB_SDIO);
 
-        for (i = 0; i < ARRAY_SIZE(if_sdio_models); i++) {
-                card = if_sdio_models[i].card;
-
-                /*
-                 * FUNC_SHUTDOWN is required for SD8688 WLAN/BT
-                 * multiple functions
-                 */
-                if (card && card->priv)
-                        card->priv->fn_shutdown_required =
-                                (card->model == IF_SDIO_MODEL_8688) ? 1 : 0;
-        }
+        /* Set the flag as user is removing this module. */
+        user_rmmod = 1;
 
         sdio_unregister_driver(&if_sdio_driver);