tifm_sd: add suspend and resume functionality

Signed-off-by: Alex Dubov <oakad@yahoo.com>
Signed-off-by: Pierre Ossman <drzeus@drzeus.cx>

1 files changed, 38 insertions, 1 deletions

diff --git a/drivers/mmc/tifm_sd.c b/drivers/mmc/tifm_sd.c
index 2adfe3467019..ce19b045ca6a 100644
--- a/drivers/mmc/tifm_sd.c
+++ b/drivers/mmc/tifm_sd.c
@@ -921,6 +921,41 @@ static void tifm_sd_remove(struct tifm_dev *sock)
         mmc_free_host(mmc);
 }
 
+#ifdef CONFIG_PM
+
+static int tifm_sd_suspend(struct tifm_dev *sock, pm_message_t state)
+{
+        struct mmc_host *mmc = tifm_get_drvdata(sock);
+        int rc;
+
+        rc = mmc_suspend_host(mmc, state);
+        /* The meaning of the bit majority in this constant is unknown. */
+        writel(0xfff8 & readl(sock->addr + SOCK_CONTROL),
+               sock->addr + SOCK_CONTROL);
+        return rc;
+}
+
+static int tifm_sd_resume(struct tifm_dev *sock)
+{
+        struct mmc_host *mmc = tifm_get_drvdata(sock);
+        struct tifm_sd *host = mmc_priv(mmc);
+
+        if (sock->media_id != FM_SD
+            || tifm_sd_initialize_host(host)) {
+                tifm_eject(sock);
+                return 0;
+        } else {
+                return mmc_resume_host(mmc);
+        }
+}
+
+#else
+
+#define tifm_sd_suspend NULL
+#define tifm_sd_resume NULL
+
+#endif /* CONFIG_PM */
+
 static tifm_media_id tifm_sd_id_tbl[] = {
         FM_SD, 0
 };
@@ -932,7 +967,9 @@ static struct tifm_driver tifm_sd_driver = {
         },
         .id_table = tifm_sd_id_tbl,
         .probe    = tifm_sd_probe,
-        .remove   = tifm_sd_remove
+        .remove   = tifm_sd_remove,
+        .suspend  = tifm_sd_suspend,
+        .resume   = tifm_sd_resume
 };
 
 static int __init tifm_sd_init(void)