libertas_spi: Add support for suspend/resume

Add support for suspend/resume in if_spi.

Signed-off-by: Vasily Khoruzhick <anarsoul@gmail.com>
Acked-by: Dan Williams <dcbw@redhat.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

1 files changed, 65 insertions, 0 deletions

diff --git a/drivers/net/wireless/libertas/if_spi.c b/drivers/net/wireless/libertas/if_spi.c
index f6c2cd665f49..078ef43d957d 100644
--- a/drivers/net/wireless/libertas/if_spi.c
+++ b/drivers/net/wireless/libertas/if_spi.c
@@ -57,6 +57,7 @@ struct if_spi_card {
         /* Handles all SPI communication (except for FW load) */
         struct workqueue_struct         *workqueue;
         struct work_struct              packet_work;
+        struct work_struct              resume_work;
 
         u8                              cmd_buffer[IF_SPI_CMD_BUF_SIZE];
 
@@ -68,6 +69,9 @@ struct if_spi_card {
 
         /* Protects cmd_packet_list and data_packet_list */
         spinlock_t                      buffer_lock;
+
+        /* True is card suspended */
+        u8                              suspended;
 };
 
 static void free_if_spi_card(struct if_spi_card *card)
@@ -1057,6 +1061,28 @@ out:
         return err;
 }
 
+static void if_spi_resume_worker(struct work_struct *work)
+{
+        struct if_spi_card *card;
+
+        card = container_of(work, struct if_spi_card, resume_work);
+
+        if (card->suspended) {
+                if (card->pdata->setup)
+                        card->pdata->setup(card->spi);
+
+                /* Init card ... */
+                if_spi_init_card(card);
+
+                enable_irq(card->spi->irq);
+
+                /* And resume it ... */
+                lbs_resume(card->priv);
+
+                card->suspended = 0;
+        }
+}
+
 static int __devinit if_spi_probe(struct spi_device *spi)
 {
         struct if_spi_card *card;
@@ -1107,6 +1133,7 @@ static int __devinit if_spi_probe(struct spi_device *spi)
                 goto free_card;
         }
         card->priv = priv;
+        priv->setup_fw_on_resume = 1;
         priv->card = card;
         priv->hw_host_to_card = if_spi_host_to_card;
         priv->enter_deep_sleep = NULL;
@@ -1117,6 +1144,7 @@ static int __devinit if_spi_probe(struct spi_device *spi)
         /* Initialize interrupt handling stuff. */
         card->workqueue = create_workqueue("libertas_spi");
         INIT_WORK(&card->packet_work, if_spi_host_to_card_worker);
+        INIT_WORK(&card->resume_work, if_spi_resume_worker);
 
         err = request_irq(spi->irq, if_spi_host_interrupt,
                         IRQF_TRIGGER_FALLING, "libertas_spi", card);
@@ -1161,6 +1189,8 @@ static int __devexit libertas_spi_remove(struct spi_device *spi)
         lbs_deb_spi("libertas_spi_remove\n");
         lbs_deb_enter(LBS_DEB_SPI);
 
+        cancel_work_sync(&card->resume_work);
+
         lbs_stop_card(priv);
         lbs_remove_card(priv); /* will call free_netdev */
 
@@ -1174,6 +1204,40 @@ static int __devexit libertas_spi_remove(struct spi_device *spi)
         return 0;
 }
 
+static int if_spi_suspend(struct device *dev)
+{
+        struct spi_device *spi = to_spi_device(dev);
+        struct if_spi_card *card = spi_get_drvdata(spi);
+
+        if (!card->suspended) {
+                lbs_suspend(card->priv);
+                flush_workqueue(card->workqueue);
+                disable_irq(spi->irq);
+
+                if (card->pdata->teardown)
+                        card->pdata->teardown(spi);
+                card->suspended = 1;
+        }
+
+        return 0;
+}
+
+static int if_spi_resume(struct device *dev)
+{
+        struct spi_device *spi = to_spi_device(dev);
+        struct if_spi_card *card = spi_get_drvdata(spi);
+
+        /* Schedule delayed work */
+        schedule_work(&card->resume_work);
+
+        return 0;
+}
+
+static const struct dev_pm_ops if_spi_pm_ops = {
+        .suspend        = if_spi_suspend,
+        .resume         = if_spi_resume,
+};
+
 static struct spi_driver libertas_spi_driver = {
         .probe  = if_spi_probe,
         .remove = __devexit_p(libertas_spi_remove),
@@ -1181,6 +1245,7 @@ static struct spi_driver libertas_spi_driver = {
                 .name   = "libertas_spi",
                 .bus    = &spi_bus_type,
                 .owner  = THIS_MODULE,
+                .pm     = &if_spi_pm_ops,
         },
 };