nfc: pn533: Add dev_up/dev_down hooks to phy_ops

This adds hooks for dev_up and dev_down to the phy_ops. They are
optional.
The idea is to inform the phy driver when the nfc chip is really going
to be used. When it is not used, the phy driver can suspend it's
interface to the nfc chip to save some power. The nfc chip is considered
not in use before dev_up and after dev_down.

Cc: Johan Hovold <johan@kernel.org>
Signed-off-by: Lars Poeschel <poeschel@lemonage.de>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/drivers/nfc/pn533/pn533.c b/drivers/nfc/pn533/pn533.c
index a172a32aa9d9329e8caaed6942609151080b0a82..64836c727aeed1b524421bccbd7b5d8c9efbd76c 100644 (file)
--- a/drivers/nfc/pn533/pn533.c
+++ b/drivers/nfc/pn533/pn533.c
@@ -2458,6 +2458,9 @@ static int pn533_dev_up(struct nfc_dev *nfc_dev)
 {
        struct pn533 *dev = nfc_get_drvdata(nfc_dev);
 
+       if (dev->phy_ops->dev_up)
+               dev->phy_ops->dev_up(dev);
+
        if (dev->device_type == PN533_DEVICE_PN532) {
                int rc = pn532_sam_configuration(nfc_dev);
 
@@ -2470,7 +2473,14 @@ static int pn533_dev_up(struct nfc_dev *nfc_dev)
 
 static int pn533_dev_down(struct nfc_dev *nfc_dev)
 {
-       return pn533_rf_field(nfc_dev, 0);
+       struct pn533 *dev = nfc_get_drvdata(nfc_dev);
+       int ret;
+
+       ret = pn533_rf_field(nfc_dev, 0);
+       if (dev->phy_ops->dev_down && !ret)
+               dev->phy_ops->dev_down(dev);
+
+       return ret;
 }
 
 static struct nfc_ops pn533_nfc_ops = {

diff --git a/drivers/nfc/pn533/pn533.h b/drivers/nfc/pn533/pn533.h
index 8bf9d6ece0f50f9707f74e5aefaa7e6f7283df87..570ee0a3e832b0ab9abcc058a284a23a0e052450 100644 (file)
--- a/drivers/nfc/pn533/pn533.h
+++ b/drivers/nfc/pn533/pn533.h
@@ -207,6 +207,15 @@ struct pn533_phy_ops {
                          struct sk_buff *out);
        int (*send_ack)(struct pn533 *dev, gfp_t flags);
        void (*abort_cmd)(struct pn533 *priv, gfp_t flags);
+       /*
+        * dev_up and dev_down are optional.
+        * They are used to inform the phy layer that the nfc chip
+        * is going to be really used very soon. The phy layer can then
+        * bring up it's interface to the chip and have it suspended for power
+        * saving reasons otherwise.
+        */
+       void (*dev_up)(struct pn533 *priv);
+       void (*dev_down)(struct pn533 *priv);
 };