can:ti_hecc: Add pm hook-up

Added the suspend and resume implementation in the HECC (CAN)
driver.

Signed-off-by: K R Baalaaji <krbaalaaji@ti.com>
Signed-off-by: Sriramakrishnan <srk@ti.com>
Acked-by: Anant Gole <anantgole@ti.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 48 insertions, 3 deletions

diff --git a/drivers/net/can/ti_hecc.c b/drivers/net/can/ti_hecc.c
index 8332e242b0be..b861cd561074 100644
--- a/drivers/net/can/ti_hecc.c
+++ b/drivers/net/can/ti_hecc.c
@@ -826,7 +826,6 @@ static int ti_hecc_open(struct net_device *ndev)
                 return err;
         }
 
-        clk_enable(priv->clk);
         ti_hecc_start(ndev);
         napi_enable(&priv->napi);
         netif_start_queue(ndev);
@@ -842,7 +841,6 @@ static int ti_hecc_close(struct net_device *ndev)
         napi_disable(&priv->napi);
         ti_hecc_stop(ndev);
         free_irq(ndev->irq, ndev);
-        clk_disable(priv->clk);
         close_candev(ndev);
 
         return 0;
@@ -928,6 +926,7 @@ static int ti_hecc_probe(struct platform_device *pdev)
         netif_napi_add(ndev, &priv->napi, ti_hecc_rx_poll,
                 HECC_DEF_NAPI_WEIGHT);
 
+        clk_enable(priv->clk);
         err = register_candev(ndev);
         if (err) {
                 dev_err(&pdev->dev, "register_candev() failed\n");
@@ -956,6 +955,7 @@ static int __devexit ti_hecc_remove(struct platform_device *pdev)
         struct net_device *ndev = platform_get_drvdata(pdev);
         struct ti_hecc_priv *priv = netdev_priv(ndev);
 
+        clk_disable(priv->clk);
         clk_put(priv->clk);
         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
         iounmap(priv->base);
@@ -967,6 +967,48 @@ static int __devexit ti_hecc_remove(struct platform_device *pdev)
         return 0;
 }
 
+
+#ifdef CONFIG_PM
+static int ti_hecc_suspend(struct platform_device *pdev, pm_message_t state)
+{
+        struct net_device *dev = platform_get_drvdata(pdev);
+        struct ti_hecc_priv *priv = netdev_priv(dev);
+
+        if (netif_running(dev)) {
+                netif_stop_queue(dev);
+                netif_device_detach(dev);
+        }
+
+        hecc_set_bit(priv, HECC_CANMC, HECC_CANMC_PDR);
+        priv->can.state = CAN_STATE_SLEEPING;
+
+        clk_disable(priv->clk);
+
+        return 0;
+}
+
+static int ti_hecc_resume(struct platform_device *pdev)
+{
+        struct net_device *dev = platform_get_drvdata(pdev);
+        struct ti_hecc_priv *priv = netdev_priv(dev);
+
+        clk_enable(priv->clk);
+
+        hecc_clear_bit(priv, HECC_CANMC, HECC_CANMC_PDR);
+        priv->can.state = CAN_STATE_ERROR_ACTIVE;
+
+        if (netif_running(dev)) {
+                netif_device_attach(dev);
+                netif_start_queue(dev);
+        }
+
+        return 0;
+}
+#else
+#define ti_hecc_suspend NULL
+#define ti_hecc_resume NULL
+#endif
+
 /* TI HECC netdevice driver: platform driver structure */
 static struct platform_driver ti_hecc_driver = {
         .driver = {
@@ -975,6 +1017,8 @@ static struct platform_driver ti_hecc_driver = {
         },
         .probe = ti_hecc_probe,
         .remove = __devexit_p(ti_hecc_remove),
+        .suspend = ti_hecc_suspend,
+        .resume = ti_hecc_resume,
 };
 
 static int __init ti_hecc_init_driver(void)
@@ -982,14 +1026,15 @@ static int __init ti_hecc_init_driver(void)
         printk(KERN_INFO DRV_DESC "\n");
         return platform_driver_register(&ti_hecc_driver);
 }
-module_init(ti_hecc_init_driver);
 
 static void __exit ti_hecc_exit_driver(void)
 {
         printk(KERN_INFO DRV_DESC " unloaded\n");
         platform_driver_unregister(&ti_hecc_driver);
 }
+
 module_exit(ti_hecc_exit_driver);
+module_init(ti_hecc_init_driver);
 
 MODULE_AUTHOR("Anant Gole <anantgole@ti.com>");
 MODULE_LICENSE("GPL v2");