linux-kernel - [PATCH v8 3/7] nfc: pn533: Add dev_up/dev_down hooks to phy

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Message-Id: <20190919091645.16439-3-poeschel@lemonage.de>
Date:   Thu, 19 Sep 2019 11:16:40 +0200
From:   Lars Poeschel <poeschel@...onage.de>
To:     Thomas Gleixner <tglx@...utronix.de>,
        Kees Cook <keescook@...omium.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Allison Randal <allison@...utok.net>,
        Jilayne Lovejoy <opensource@...ayne.com>,
        Lars Poeschel <poeschel@...onage.de>,
        "Gustavo A. R. Silva" <gustavo@...eddedor.com>,
        Steve Winslow <swinslow@...il.com>,
        netdev@...r.kernel.org (open list:NFC SUBSYSTEM),
        linux-kernel@...r.kernel.org (open list)
Cc:     Johan Hovold <johan@...nel.org>
Subject: [PATCH v8 3/7] 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@...nel.org>
Signed-off-by: Lars Poeschel <poeschel@...onage.de>
---
Changes in v6:
- Rebased the patch series on v5.3-rc5

Changes in v5:
- (dev->phy_ops->dev_up) instead (dev->phy_ops)

Changes in v4:
- This patch is new in v4

 drivers/nfc/pn533/pn533.c | 12 +++++++++++-
 drivers/nfc/pn533/pn533.h |  9 +++++++++
 2 files changed, 20 insertions(+), 1 deletion(-)

diff --git a/drivers/nfc/pn533/pn533.c b/drivers/nfc/pn533/pn533.c
index a172a32aa9d9..64836c727aee 100644
--- 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 8bf9d6ece0f5..570ee0a3e832 100644
--- 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);
 };
 
 
-- 
2.23.0