NFC: nfcmrvl: add platform_data and DT configuration

Declare nfcmrvl platform_data structure and few DT parameters
for nfcmrvl driver.

Signed-off-by: Vincent Cuissard <cuissard@marvell.com>
Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>

4 files changed, 113 insertions, 26 deletions

diff --git a/drivers/nfc/nfcmrvl/main.c b/drivers/nfc/nfcmrvl/main.c
index 708aad28c567..e317a69a4560 100644
--- a/drivers/nfc/nfcmrvl/main.c
+++ b/drivers/nfc/nfcmrvl/main.c
@@ -19,6 +19,7 @@
 #include <linux/module.h>
 #include <linux/gpio.h>
 #include <linux/delay.h>
+#include <linux/of_gpio.h>
 #include <linux/nfc.h>
 #include <net/nfc/nci.h>
 #include <net/nfc/nci_core.h>
@@ -65,7 +66,7 @@ static int nfcmrvl_nci_send(struct nci_dev *ndev, struct sk_buff *skb)
         if (!test_bit(NFCMRVL_NCI_RUNNING, &priv->flags))
                 return -EBUSY;
 
-        if (priv->hci_muxed) {
+        if (priv->config.hci_muxed) {
                 unsigned char *hdr;
                 unsigned char len = skb->len;
 
@@ -92,9 +93,9 @@ static struct nci_ops nfcmrvl_nci_ops = {
 };
 
 struct nfcmrvl_private *nfcmrvl_nci_register_dev(void *drv_data,
-                                                 struct nfcmrvl_if_ops *ops,
-                                                 struct device *dev,
-                                                 unsigned int flags)
+                                struct nfcmrvl_if_ops *ops,
+                                struct device *dev,
+                                struct nfcmrvl_platform_data *pdata)
 {
         struct nfcmrvl_private *priv;
         int rc;
@@ -108,23 +109,24 @@ struct nfcmrvl_private *nfcmrvl_nci_register_dev(void *drv_data,
         priv->drv_data = drv_data;
         priv->if_ops = ops;
         priv->dev = dev;
-        priv->hci_muxed = (flags & NFCMRVL_DEV_FLAG_HCI_MUXED) ? 1 : 0;
-        priv->reset_n_io = NFCMRVL_DEV_FLAG_GET_RESET_N_IO(flags);
 
-        if (priv->reset_n_io) {
+        memcpy(&priv->config, pdata, sizeof(*pdata));
+
+        if (priv->config.reset_n_io) {
                 rc = devm_gpio_request_one(dev,
-                                           priv->reset_n_io,
+                                           priv->config.reset_n_io,
                                            GPIOF_OUT_INIT_LOW,
                                            "nfcmrvl_reset_n");
                 if (rc < 0)
                         nfc_err(dev, "failed to request reset_n io\n");
         }
 
-        if (priv->hci_muxed)
+        if (priv->config.hci_muxed)
                 headroom = NFCMRVL_HCI_EVENT_HEADER_SIZE;
 
         protocols = NFC_PROTO_JEWEL_MASK
-                | NFC_PROTO_MIFARE_MASK | NFC_PROTO_FELICA_MASK
+                | NFC_PROTO_MIFARE_MASK
+                | NFC_PROTO_FELICA_MASK
                 | NFC_PROTO_ISO14443_MASK
                 | NFC_PROTO_ISO14443_B_MASK
                 | NFC_PROTO_NFC_DEP_MASK;
@@ -169,7 +171,7 @@ EXPORT_SYMBOL_GPL(nfcmrvl_nci_unregister_dev);
 
 int nfcmrvl_nci_recv_frame(struct nfcmrvl_private *priv, struct sk_buff *skb)
 {
-        if (priv->hci_muxed) {
+        if (priv->config.hci_muxed) {
                 if (skb->data[0] == NFCMRVL_HCI_EVENT_CODE &&
                     skb->data[1] == NFCMRVL_HCI_NFC_EVENT_CODE) {
                         /* Data packet, let's extract NCI payload */
@@ -200,15 +202,51 @@ void nfcmrvl_chip_reset(struct nfcmrvl_private *priv)
          * To be improved.
          */
 
-        if (priv->reset_n_io) {
+        if (priv->config.reset_n_io) {
                 nfc_info(priv->dev, "reset the chip\n");
-                gpio_set_value(priv->reset_n_io, 0);
+                gpio_set_value(priv->config.reset_n_io, 0);
                 usleep_range(5000, 10000);
-                gpio_set_value(priv->reset_n_io, 1);
+                gpio_set_value(priv->config.reset_n_io, 1);
         } else
                 nfc_info(priv->dev, "no reset available on this interface\n");
 }
 
+#ifdef CONFIG_OF
+
+int nfcmrvl_parse_dt(struct device_node *node,
+                     struct nfcmrvl_platform_data *pdata)
+{
+        int reset_n_io;
+
+        reset_n_io = of_get_named_gpio(node, "reset-n-io", 0);
+        if (reset_n_io < 0) {
+                pr_info("no reset-n-io config\n");
+                reset_n_io = 0;
+        } else if (!gpio_is_valid(reset_n_io)) {
+                pr_err("invalid reset-n-io GPIO\n");
+                return reset_n_io;
+        }
+        pdata->reset_n_io = reset_n_io;
+
+        if (of_find_property(node, "hci-muxed", NULL))
+                pdata->hci_muxed = 1;
+        else
+                pdata->hci_muxed = 0;
+
+        return 0;
+}
+
+#else
+
+int nfcmrvl_parse_dt(struct device_node *node,
+                     struct nfcmrvl_platform_data *pdata)
+{
+        return -ENODEV;
+}
+
+#endif
+EXPORT_SYMBOL_GPL(nfcmrvl_parse_dt);
+
 MODULE_AUTHOR("Marvell International Ltd.");
 MODULE_DESCRIPTION("Marvell NFC driver ver " VERSION);
 MODULE_VERSION(VERSION);
diff --git a/drivers/nfc/nfcmrvl/nfcmrvl.h b/drivers/nfc/nfcmrvl/nfcmrvl.h
index 2edae9a4b6bd..214412bd6110 100644
--- a/drivers/nfc/nfcmrvl/nfcmrvl.h
+++ b/drivers/nfc/nfcmrvl/nfcmrvl.h
@@ -16,6 +16,11 @@
  * this warranty disclaimer.
  **/
 
+#ifndef _NFCMRVL_H_
+#define _NFCMRVL_H_
+
+#include <linux/platform_data/nfcmrvl.h>
+
 /* Define private flags: */
 #define NFCMRVL_NCI_RUNNING                     1
 
@@ -38,22 +43,25 @@
 #define NFCMRVL_HCI_OGF                         0x81
 #define NFCMRVL_HCI_OCF                         0xFE
 
-#define NFCMRVL_DEV_FLAG_HCI_MUXED              (1 << 0)
-#define NFCMRVL_DEV_FLAG_SET_RESET_N_IO(X)      ((X) << 16)
-#define NFCMRVL_DEV_FLAG_GET_RESET_N_IO(X)      ((X) >> 16)
 
 struct nfcmrvl_private {
 
-        /* Tell if NCI packets are encapsulated in HCI ones */
-        int hci_muxed;
+        unsigned long flags;
+
+        /* Platform configuration */
+        struct nfcmrvl_platform_data config;
+
         struct nci_dev *ndev;
 
-        /* Reset IO (0 if not available) */
-        int reset_n_io;
+        /*
+        ** PHY related information
+        */
 
-        unsigned long flags;
+        /* PHY driver context */
         void *drv_data;
+        /* PHY device */
         struct device *dev;
+        /* Low level driver ops */
         struct nfcmrvl_if_ops *if_ops;
 };
 
@@ -66,8 +74,14 @@ struct nfcmrvl_if_ops {
 void nfcmrvl_nci_unregister_dev(struct nfcmrvl_private *priv);
 int nfcmrvl_nci_recv_frame(struct nfcmrvl_private *priv, struct sk_buff *skb);
 struct nfcmrvl_private *nfcmrvl_nci_register_dev(void *drv_data,
-                                                 struct nfcmrvl_if_ops *ops,
-                                                 struct device *dev,
-                                                 unsigned int flags);
+                                struct nfcmrvl_if_ops *ops,
+                                struct device *dev,
+                                struct nfcmrvl_platform_data *pdata);
+
 
 void nfcmrvl_chip_reset(struct nfcmrvl_private *priv);
+
+int nfcmrvl_parse_dt(struct device_node *node,
+                     struct nfcmrvl_platform_data *pdata);
+
+#endif
diff --git a/drivers/nfc/nfcmrvl/usb.c b/drivers/nfc/nfcmrvl/usb.c
index c4046b681bfa..aa3f3c1cff0a 100644
--- a/drivers/nfc/nfcmrvl/usb.c
+++ b/drivers/nfc/nfcmrvl/usb.c
@@ -302,6 +302,10 @@ static int nfcmrvl_probe(struct usb_interface *intf,
         struct nfcmrvl_private *priv;
         int i;
         struct usb_device *udev = interface_to_usbdev(intf);
+        struct nfcmrvl_platform_data config;
+
+        /* No configuration for USB */
+        memset(&config, 0, sizeof(config));
 
         nfc_info(&udev->dev, "intf %p id %p\n", intf, id);
 
@@ -339,7 +343,7 @@ static int nfcmrvl_probe(struct usb_interface *intf,
         init_usb_anchor(&drv_data->deferred);
 
         priv = nfcmrvl_nci_register_dev(drv_data, &usb_ops,
-                                        &drv_data->udev->dev, 0);
+                                        &drv_data->udev->dev, &config);
         if (IS_ERR(priv))
                 return PTR_ERR(priv);
 
diff --git a/include/linux/platform_data/nfcmrvl.h b/include/linux/platform_data/nfcmrvl.h
new file mode 100644
index 000000000000..106cfe5ed589
--- /dev/null
+++ b/include/linux/platform_data/nfcmrvl.h
@@ -0,0 +1,31 @@
+/*
+ * Copyright (C) 2015, Marvell International Ltd.
+ *
+ * This software file (the "File") is distributed by Marvell International
+ * Ltd. under the terms of the GNU General Public License Version 2, June 1991
+ * (the "License").  You may use, redistribute and/or modify this File in
+ * accordance with the terms and conditions of the License, a copy of which
+ * is available on the worldwide web at
+ * http://www.gnu.org/licenses/old-licenses/gpl-2.0.txt.
+ *
+ * THE FILE IS DISTRIBUTED AS-IS, WITHOUT WARRANTY OF ANY KIND, AND THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE
+ * ARE EXPRESSLY DISCLAIMED.  The License provides additional details about
+ * this warranty disclaimer.
+ */
+
+#ifndef _NFCMRVL_PTF_H_
+#define _NFCMRVL_PTF_H_
+
+struct nfcmrvl_platform_data {
+        /*
+         * Generic
+         */
+
+        /* GPIO that is wired to RESET_N signal */
+        unsigned int reset_n_io;
+        /* Tell if transport is muxed in HCI one */
+        unsigned int hci_muxed;
+};
+
+#endif /* _NFCMRVL_PTF_H_ */