net/irda: sh_irda: add PM support

Signed-off-by: Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 27 insertions, 11 deletions

diff --git a/drivers/net/irda/sh_irda.c b/drivers/net/irda/sh_irda.c
index b86f408bbb7e..d275e276e742 100644
--- a/drivers/net/irda/sh_irda.c
+++ b/drivers/net/irda/sh_irda.c
@@ -26,6 +26,7 @@
 #include <linux/interrupt.h>
 #include <linux/module.h>
 #include <linux/platform_device.h>
+#include <linux/pm_runtime.h>
 #include <linux/clk.h>
 #include <net/irda/wrapper.h>
 #include <net/irda/irda_device.h>
@@ -145,7 +146,7 @@ struct sh_irda_xir_func {
 struct sh_irda_self {
         void __iomem            *membase;
         unsigned int            irq;
-        struct clk              *clk;
+        struct platform_device  *pdev;
 
         struct net_device       *ndev;
 
@@ -694,7 +695,7 @@ static int sh_irda_open(struct net_device *ndev)
         struct sh_irda_self *self = netdev_priv(ndev);
         int err;
 
-        clk_enable(self->clk);
+        pm_runtime_get_sync(&self->pdev->dev);
         err = sh_irda_crc_init(self);
         if (err)
                 goto open_err;
@@ -718,7 +719,7 @@ static int sh_irda_open(struct net_device *ndev)
         return 0;
 
 open_err:
-        clk_disable(self->clk);
+        pm_runtime_put_sync(&self->pdev->dev);
 
         return err;
 }
@@ -734,6 +735,7 @@ static int sh_irda_stop(struct net_device *ndev)
         }
 
         netif_stop_queue(ndev);
+        pm_runtime_put_sync(&self->pdev->dev);
 
         dev_info(&ndev->dev, "stoped\n");
 
@@ -786,11 +788,8 @@ static int __devinit sh_irda_probe(struct platform_device *pdev)
         if (err)
                 goto err_mem_2;
 
-        self->clk = clk_get(&pdev->dev, NULL);
-        if (IS_ERR(self->clk)) {
-                dev_err(&pdev->dev, "cannot get irda clock\n");
-                goto err_mem_3;
-        }
+        self->pdev = pdev;
+        pm_runtime_enable(&pdev->dev);
 
         irda_init_max_qos_capabilies(&self->qos);
 
@@ -820,8 +819,7 @@ static int __devinit sh_irda_probe(struct platform_device *pdev)
         goto exit;
 
 err_mem_4:
-        clk_put(self->clk);
-err_mem_3:
+        pm_runtime_disable(&pdev->dev);
         sh_irda_remove_iobuf(self);
 err_mem_2:
         iounmap(self->membase);
@@ -840,7 +838,7 @@ static int __devexit sh_irda_remove(struct platform_device *pdev)
                 return 0;
 
         unregister_netdev(ndev);
-        clk_put(self->clk);
+        pm_runtime_disable(&pdev->dev);
         sh_irda_remove_iobuf(self);
         iounmap(self->membase);
         free_netdev(ndev);
@@ -849,11 +847,29 @@ static int __devexit sh_irda_remove(struct platform_device *pdev)
         return 0;
 }
 
+static int sh_irda_runtime_nop(struct device *dev)
+{
+        /* Runtime PM callback shared between ->runtime_suspend()
+         * and ->runtime_resume(). Simply returns success.
+         *
+         * This driver re-initializes all registers after
+         * pm_runtime_get_sync() anyway so there is no need
+         * to save and restore registers here.
+         */
+        return 0;
+}
+
+static const struct dev_pm_ops sh_irda_pm_ops = {
+        .runtime_suspend        = sh_irda_runtime_nop,
+        .runtime_resume         = sh_irda_runtime_nop,
+};
+
 static struct platform_driver sh_irda_driver = {
         .probe  = sh_irda_probe,
         .remove = __devexit_p(sh_irda_remove),
         .driver = {
                 .name   = DRIVER_NAME,
+                .pm     = &sh_irda_pm_ops,
         },
 };