drivers/nfc/nfcmrvl/main.c

   1 /*
   2  * Marvell NFC driver: major functions
   3  *
   4  * Copyright (C) 2014-2015 Marvell International Ltd.
   5  *
   6  * This software file (the "File") is distributed by Marvell International
   7  * Ltd. under the terms of the GNU General Public License Version 2, June 1991
   8  * (the "License").  You may use, redistribute and/or modify this File in
   9  * accordance with the terms and conditions of the License, a copy of which
  10  * is available on the worldwide web at
  11  * http://www.gnu.org/licenses/old-licenses/gpl-2.0.txt.
  12  *
  13  * THE FILE IS DISTRIBUTED AS-IS, WITHOUT WARRANTY OF ANY KIND, AND THE
  14  * IMPLIED WARRANTIES OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE
  15  * ARE EXPRESSLY DISCLAIMED.  The License provides additional details about
  16  * this warranty disclaimer.
  17  */
  18
  19 #include <linux/module.h>
  20 #include <linux/gpio.h>
  21 #include <linux/delay.h>
  22 #include <linux/of_gpio.h>
  23 #include <linux/nfc.h>
  24 #include <net/nfc/nci.h>
  25 #include <net/nfc/nci_core.h>
  26 #include "nfcmrvl.h"
  27
  28 static int nfcmrvl_nci_open(struct nci_dev *ndev)
  29 {
  30         struct nfcmrvl_private *priv = nci_get_drvdata(ndev);
  31         int err;
  32
  33         if (test_and_set_bit(NFCMRVL_NCI_RUNNING, &priv->flags))
  34                 return 0;
  35
  36         err = priv->if_ops->nci_open(priv);
  37
  38         if (err)
  39                 clear_bit(NFCMRVL_NCI_RUNNING, &priv->flags);
  40
  41         return err;
  42 }
  43
  44 static int nfcmrvl_nci_close(struct nci_dev *ndev)
  45 {
  46         struct nfcmrvl_private *priv = nci_get_drvdata(ndev);
  47
  48         if (!test_and_clear_bit(NFCMRVL_NCI_RUNNING, &priv->flags))
  49                 return 0;
  50
  51         priv->if_ops->nci_close(priv);
  52
  53         return 0;
  54 }
  55
  56 static int nfcmrvl_nci_send(struct nci_dev *ndev, struct sk_buff *skb)
  57 {
  58         struct nfcmrvl_private *priv = nci_get_drvdata(ndev);
  59
  60         nfc_info(priv->dev, "send entry, len %d\n", skb->len);
  61
  62         skb->dev = (void *)ndev;
  63
  64         if (!test_bit(NFCMRVL_NCI_RUNNING, &priv->flags))
  65                 return -EBUSY;
  66
  67         if (priv->config.hci_muxed) {
  68                 unsigned char *hdr;
  69                 unsigned char len = skb->len;
  70
  71                 hdr = (char *) skb_push(skb, NFCMRVL_HCI_EVENT_HEADER_SIZE);
  72                 hdr[0] = NFCMRVL_HCI_COMMAND_CODE;
  73                 hdr[1] = NFCMRVL_HCI_OGF;
  74                 hdr[2] = NFCMRVL_HCI_OCF;
  75                 hdr[3] = len;
  76         }
  77
  78         return priv->if_ops->nci_send(priv, skb);
  79 }
  80
  81 static int nfcmrvl_nci_setup(struct nci_dev *ndev)
  82 {
  83         __u8 val = 1;
  84
  85         nci_set_config(ndev, NFCMRVL_PB_BAIL_OUT, 1, &val);
  86         return 0;
  87 }
  88
  89 static struct nci_ops nfcmrvl_nci_ops = {
  90         .open = nfcmrvl_nci_open,
  91         .close = nfcmrvl_nci_close,
  92         .send = nfcmrvl_nci_send,
  93         .setup = nfcmrvl_nci_setup,
  94 };
  95
  96 struct nfcmrvl_private *nfcmrvl_nci_register_dev(void *drv_data,
  97                                 struct nfcmrvl_if_ops *ops,
  98                                 struct device *dev,
  99                                 struct nfcmrvl_platform_data *pdata)
 100 {
 101         struct nfcmrvl_private *priv;
 102         int rc;
 103         int headroom = 0;
 104         u32 protocols;
 105
 106         priv = kzalloc(sizeof(*priv), GFP_KERNEL);
 107         if (!priv)
 108                 return ERR_PTR(-ENOMEM);
 109
 110         priv->drv_data = drv_data;
 111         priv->if_ops = ops;
 112         priv->dev = dev;
 113
 114         memcpy(&priv->config, pdata, sizeof(*pdata));
 115
 116         if (priv->config.reset_n_io) {
 117                 rc = devm_gpio_request_one(dev,
 118                                            priv->config.reset_n_io,
 119                                            GPIOF_OUT_INIT_LOW,
 120                                            "nfcmrvl_reset_n");
 121                 if (rc < 0)
 122                         nfc_err(dev, "failed to request reset_n io\n");
 123         }
 124
 125         if (priv->config.hci_muxed)
 126                 headroom = NFCMRVL_HCI_EVENT_HEADER_SIZE;
 127
 128         protocols = NFC_PROTO_JEWEL_MASK
 129                 | NFC_PROTO_MIFARE_MASK
 130                 | NFC_PROTO_FELICA_MASK
 131                 | NFC_PROTO_ISO14443_MASK
 132                 | NFC_PROTO_ISO14443_B_MASK
 133                 | NFC_PROTO_ISO15693_MASK
 134                 | NFC_PROTO_NFC_DEP_MASK;
 135
 136         priv->ndev = nci_allocate_device(&nfcmrvl_nci_ops, protocols,
 137                                          headroom, 0);
 138         if (!priv->ndev) {
 139                 nfc_err(dev, "nci_allocate_device failed\n");
 140                 rc = -ENOMEM;
 141                 goto error;
 142         }
 143
 144         nci_set_drvdata(priv->ndev, priv);
 145
 146         nfcmrvl_chip_reset(priv);
 147
 148         rc = nci_register_device(priv->ndev);
 149         if (rc) {
 150                 nfc_err(dev, "nci_register_device failed %d\n", rc);
 151                 nci_free_device(priv->ndev);
 152                 goto error;
 153         }
 154
 155         nfc_info(dev, "registered with nci successfully\n");
 156         return priv;
 157
 158 error:
 159         kfree(priv);
 160         return ERR_PTR(rc);
 161 }
 162 EXPORT_SYMBOL_GPL(nfcmrvl_nci_register_dev);
 163
 164 void nfcmrvl_nci_unregister_dev(struct nfcmrvl_private *priv)
 165 {
 166         struct nci_dev *ndev = priv->ndev;
 167
 168         nci_unregister_device(ndev);
 169         nci_free_device(ndev);
 170         kfree(priv);
 171 }
 172 EXPORT_SYMBOL_GPL(nfcmrvl_nci_unregister_dev);
 173
 174 int nfcmrvl_nci_recv_frame(struct nfcmrvl_private *priv, struct sk_buff *skb)
 175 {
 176         if (priv->config.hci_muxed) {
 177                 if (skb->data[0] == NFCMRVL_HCI_EVENT_CODE &&
 178                     skb->data[1] == NFCMRVL_HCI_NFC_EVENT_CODE) {
 179                         /* Data packet, let's extract NCI payload */
 180                         skb_pull(skb, NFCMRVL_HCI_EVENT_HEADER_SIZE);
 181                 } else {
 182                         /* Skip this packet */
 183                         kfree_skb(skb);
 184                         return 0;
 185                 }
 186         }
 187
 188         if (test_bit(NFCMRVL_NCI_RUNNING, &priv->flags))
 189                 nci_recv_frame(priv->ndev, skb);
 190         else {
 191                 /* Drop this packet since nobody wants it */
 192                 kfree_skb(skb);
 193                 return 0;
 194         }
 195
 196         return 0;
 197 }
 198 EXPORT_SYMBOL_GPL(nfcmrvl_nci_recv_frame);
 199
 200 void nfcmrvl_chip_reset(struct nfcmrvl_private *priv)
 201 {
 202         /*
 203          * This function does not take care if someone is using the device.
 204          * To be improved.
 205          */
 206
 207         if (priv->config.reset_n_io) {
 208                 nfc_info(priv->dev, "reset the chip\n");
 209                 gpio_set_value(priv->config.reset_n_io, 0);
 210                 usleep_range(5000, 10000);
 211                 gpio_set_value(priv->config.reset_n_io, 1);
 212         } else
 213                 nfc_info(priv->dev, "no reset available on this interface\n");
 214 }
 215
 216 #ifdef CONFIG_OF
 217
 218 int nfcmrvl_parse_dt(struct device_node *node,
 219                      struct nfcmrvl_platform_data *pdata)
 220 {
 221         int reset_n_io;
 222
 223         reset_n_io = of_get_named_gpio(node, "reset-n-io", 0);
 224         if (reset_n_io < 0) {
 225                 pr_info("no reset-n-io config\n");
 226                 reset_n_io = 0;
 227         } else if (!gpio_is_valid(reset_n_io)) {
 228                 pr_err("invalid reset-n-io GPIO\n");
 229                 return reset_n_io;
 230         }
 231         pdata->reset_n_io = reset_n_io;
 232
 233         if (of_find_property(node, "hci-muxed", NULL))
 234                 pdata->hci_muxed = 1;
 235         else
 236                 pdata->hci_muxed = 0;
 237
 238         return 0;
 239 }
 240
 241 #else
 242
 243 int nfcmrvl_parse_dt(struct device_node *node,
 244                      struct nfcmrvl_platform_data *pdata)
 245 {
 246         return -ENODEV;
 247 }
 248
 249 #endif
 250 EXPORT_SYMBOL_GPL(nfcmrvl_parse_dt);
 251
 252 MODULE_AUTHOR("Marvell International Ltd.");
 253 MODULE_DESCRIPTION("Marvell NFC driver");
 254 MODULE_LICENSE("GPL v2");