mmc: dw_mmc: support mmc power control with regulator

This patch adds support for power regulators.

Signed-off-by: Jaehoon Chung <jh80.chung@samsung.com>
Signed-off-by: kyungmin Park <kyungmin.park@samsung.com>
Acked-by: Will Newton <will.newton@imgtec.com>
Signed-off-by: Chris Ball <cjb@laptop.org>

1 files changed, 25 insertions, 0 deletions

diff --git a/drivers/mmc/host/dw_mmc.c b/drivers/mmc/host/dw_mmc.c
index 51ee2f5909d..5a614069cb0 100644
--- a/drivers/mmc/host/dw_mmc.c
+++ b/drivers/mmc/host/dw_mmc.c
@@ -32,6 +32,7 @@
 #include <linux/mmc/mmc.h>
 #include <linux/mmc/dw_mmc.h>
 #include <linux/bitops.h>
+#include <linux/regulator/consumer.h>
 
 #include "dw_mmc.h"
 
@@ -1440,6 +1441,13 @@ static int __init dw_mci_init_slot(struct dw_mci *host, unsigned int id)
         }
 #endif /* CONFIG_MMC_DW_IDMAC */
 
+        host->vmmc = regulator_get(mmc_dev(mmc), "vmmc");
+        if (IS_ERR(host->vmmc)) {
+                printk(KERN_INFO "%s: no vmmc regulator found\n", mmc_hostname(mmc));
+                host->vmmc = NULL;
+        } else
+                regulator_enable(host->vmmc);
+
         if (dw_mci_get_cd(mmc))
                 set_bit(DW_MMC_CARD_PRESENT, &slot->flags);
         else
@@ -1704,6 +1712,12 @@ err_dmaunmap:
                           host->sg_cpu, host->sg_dma);
         iounmap(host->regs);
 
+        if (host->vmmc) {
+                regulator_disable(host->vmmc);
+                regulator_put(host->vmmc);
+        }
+
+
 err_freehost:
         kfree(host);
         return ret;
@@ -1735,6 +1749,11 @@ static int __exit dw_mci_remove(struct platform_device *pdev)
         if (host->use_dma && host->dma_ops->exit)
                 host->dma_ops->exit(host);
 
+        if (host->vmmc) {
+                regulator_disable(host->vmmc);
+                regulator_put(host->vmmc);
+        }
+
         iounmap(host->regs);
 
         kfree(host);
@@ -1750,6 +1769,9 @@ static int dw_mci_suspend(struct platform_device *pdev, pm_message_t mesg)
         int i, ret;
         struct dw_mci *host = platform_get_drvdata(pdev);
 
+        if (host->vmmc)
+                regulator_enable(host->vmmc);
+
         for (i = 0; i < host->num_slots; i++) {
                 struct dw_mci_slot *slot = host->slot[i];
                 if (!slot)
@@ -1765,6 +1787,9 @@ static int dw_mci_suspend(struct platform_device *pdev, pm_message_t mesg)
                 }
         }
 
+        if (host->vmmc)
+                regulator_disable(host->vmmc);
+
         return 0;
 }