drivers/nfc/nfcmrvl/main.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * Marvell NFC driver: major functions
   4  *
   5  * Copyright (C) 2014-2015 Marvell International Ltd.
   6  */
   7
   8 #include <linux/module.h>
   9 #include <linux/gpio.h>
  10 #include <linux/delay.h>
  11 #include <linux/of_gpio.h>
  12 #include <linux/nfc.h>
  13 #include <net/nfc/nci.h>
  14 #include <net/nfc/nci_core.h>
  15 #include "nfcmrvl.h"
  16
  17 static int nfcmrvl_nci_open(struct nci_dev *ndev)
  18 {
  19         struct nfcmrvl_private *priv = nci_get_drvdata(ndev);
  20         int err;
  21
  22         if (test_and_set_bit(NFCMRVL_NCI_RUNNING, &priv->flags))
  23                 return 0;
  24
  25         /* Reset possible fault of previous session */
  26         clear_bit(NFCMRVL_PHY_ERROR, &priv->flags);
  27
  28         err = priv->if_ops->nci_open(priv);
  29
  30         if (err)
  31                 clear_bit(NFCMRVL_NCI_RUNNING, &priv->flags);
  32
  33         return err;
  34 }
  35
  36 static int nfcmrvl_nci_close(struct nci_dev *ndev)
  37 {
  38         struct nfcmrvl_private *priv = nci_get_drvdata(ndev);
  39
  40         if (!test_and_clear_bit(NFCMRVL_NCI_RUNNING, &priv->flags))
  41                 return 0;
  42
  43         priv->if_ops->nci_close(priv);
  44
  45         return 0;
  46 }
  47
  48 static int nfcmrvl_nci_send(struct nci_dev *ndev, struct sk_buff *skb)
  49 {
  50         struct nfcmrvl_private *priv = nci_get_drvdata(ndev);
  51
  52         nfc_info(priv->dev, "send entry, len %d\n", skb->len);
  53
  54         skb->dev = (void *)ndev;
  55
  56         if (priv->config.hci_muxed) {
  57                 unsigned char *hdr;
  58                 unsigned char len = skb->len;
  59
  60                 hdr = skb_push(skb, NFCMRVL_HCI_EVENT_HEADER_SIZE);
  61                 hdr[0] = NFCMRVL_HCI_COMMAND_CODE;
  62                 hdr[1] = NFCMRVL_HCI_OGF;
  63                 hdr[2] = NFCMRVL_HCI_OCF;
  64                 hdr[3] = len;
  65         }
  66
  67         return priv->if_ops->nci_send(priv, skb);
  68 }
  69
  70 static int nfcmrvl_nci_setup(struct nci_dev *ndev)
  71 {
  72         __u8 val = 1;
  73
  74         nci_set_config(ndev, NFCMRVL_PB_BAIL_OUT, 1, &val);
  75         return 0;
  76 }
  77
  78 static int nfcmrvl_nci_fw_download(struct nci_dev *ndev,
  79                                    const char *firmware_name)
  80 {
  81         return nfcmrvl_fw_dnld_start(ndev, firmware_name);
  82 }
  83
  84 static struct nci_ops nfcmrvl_nci_ops = {
  85         .open = nfcmrvl_nci_open,
  86         .close = nfcmrvl_nci_close,
  87         .send = nfcmrvl_nci_send,
  88         .setup = nfcmrvl_nci_setup,
  89         .fw_download = nfcmrvl_nci_fw_download,
  90 };
  91
  92 struct nfcmrvl_private *nfcmrvl_nci_register_dev(enum nfcmrvl_phy phy,
  93                                 void *drv_data,
  94                                 struct nfcmrvl_if_ops *ops,
  95                                 struct device *dev,
  96                                 struct nfcmrvl_platform_data *pdata)
  97 {
  98         struct nfcmrvl_private *priv;
  99         int rc;
 100         int headroom;
 101         int tailroom;
 102         u32 protocols;
 103
 104         priv = kzalloc(sizeof(*priv), GFP_KERNEL);
 105         if (!priv)
 106                 return ERR_PTR(-ENOMEM);
 107
 108         priv->drv_data = drv_data;
 109         priv->if_ops = ops;
 110         priv->dev = dev;
 111         priv->phy = phy;
 112
 113         memcpy(&priv->config, pdata, sizeof(*pdata));
 114
 115         if (gpio_is_valid(priv->config.reset_n_io)) {
 116                 rc = gpio_request_one(priv->config.reset_n_io,
 117                                       GPIOF_OUT_INIT_LOW,
 118                                       "nfcmrvl_reset_n");
 119                 if (rc < 0) {
 120                         priv->config.reset_n_io = -EINVAL;
 121                         nfc_err(dev, "failed to request reset_n io\n");
 122                 }
 123         }
 124
 125         if (phy == NFCMRVL_PHY_SPI) {
 126                 headroom = NCI_SPI_HDR_LEN;
 127                 tailroom = 1;
 128         } else
 129                 headroom = tailroom = 0;
 130
 131         if (priv->config.hci_muxed)
 132                 headroom += NFCMRVL_HCI_EVENT_HEADER_SIZE;
 133
 134         protocols = NFC_PROTO_JEWEL_MASK
 135                 | NFC_PROTO_MIFARE_MASK
 136                 | NFC_PROTO_FELICA_MASK
 137                 | NFC_PROTO_ISO14443_MASK
 138                 | NFC_PROTO_ISO14443_B_MASK
 139                 | NFC_PROTO_ISO15693_MASK
 140                 | NFC_PROTO_NFC_DEP_MASK;
 141
 142         priv->ndev = nci_allocate_device(&nfcmrvl_nci_ops, protocols,
 143                                          headroom, tailroom);
 144         if (!priv->ndev) {
 145                 nfc_err(dev, "nci_allocate_device failed\n");
 146                 rc = -ENOMEM;
 147                 goto error_free_gpio;
 148         }
 149
 150         rc = nfcmrvl_fw_dnld_init(priv);
 151         if (rc) {
 152                 nfc_err(dev, "failed to initialize FW download %d\n", rc);
 153                 goto error_free_dev;
 154         }
 155
 156         nci_set_drvdata(priv->ndev, priv);
 157
 158         rc = nci_register_device(priv->ndev);
 159         if (rc) {
 160                 nfc_err(dev, "nci_register_device failed %d\n", rc);
 161                 goto error_fw_dnld_deinit;
 162         }
 163
 164         /* Ensure that controller is powered off */
 165         nfcmrvl_chip_halt(priv);
 166
 167         nfc_info(dev, "registered with nci successfully\n");
 168         return priv;
 169
 170 error_fw_dnld_deinit:
 171         nfcmrvl_fw_dnld_deinit(priv);
 172 error_free_dev:
 173         nci_free_device(priv->ndev);
 174 error_free_gpio:
 175         if (gpio_is_valid(priv->config.reset_n_io))
 176                 gpio_free(priv->config.reset_n_io);
 177         kfree(priv);
 178         return ERR_PTR(rc);
 179 }
 180 EXPORT_SYMBOL_GPL(nfcmrvl_nci_register_dev);
 181
 182 void nfcmrvl_nci_unregister_dev(struct nfcmrvl_private *priv)
 183 {
 184         struct nci_dev *ndev = priv->ndev;
 185
 186         if (priv->ndev->nfc_dev->fw_download_in_progress)
 187                 nfcmrvl_fw_dnld_abort(priv);
 188
 189         nfcmrvl_fw_dnld_deinit(priv);
 190
 191         if (gpio_is_valid(priv->config.reset_n_io))
 192                 gpio_free(priv->config.reset_n_io);
 193
 194         nci_unregister_device(ndev);
 195         nci_free_device(ndev);
 196         kfree(priv);
 197 }
 198 EXPORT_SYMBOL_GPL(nfcmrvl_nci_unregister_dev);
 199
 200 int nfcmrvl_nci_recv_frame(struct nfcmrvl_private *priv, struct sk_buff *skb)
 201 {
 202         if (priv->config.hci_muxed) {
 203                 if (skb->data[0] == NFCMRVL_HCI_EVENT_CODE &&
 204                     skb->data[1] == NFCMRVL_HCI_NFC_EVENT_CODE) {
 205                         /* Data packet, let's extract NCI payload */
 206                         skb_pull(skb, NFCMRVL_HCI_EVENT_HEADER_SIZE);
 207                 } else {
 208                         /* Skip this packet */
 209                         kfree_skb(skb);
 210                         return 0;
 211                 }
 212         }
 213
 214         if (priv->ndev->nfc_dev->fw_download_in_progress) {
 215                 nfcmrvl_fw_dnld_recv_frame(priv, skb);
 216                 return 0;
 217         }
 218
 219         if (test_bit(NFCMRVL_NCI_RUNNING, &priv->flags))
 220                 nci_recv_frame(priv->ndev, skb);
 221         else {
 222                 /* Drop this packet since nobody wants it */
 223                 kfree_skb(skb);
 224                 return 0;
 225         }
 226
 227         return 0;
 228 }
 229 EXPORT_SYMBOL_GPL(nfcmrvl_nci_recv_frame);
 230
 231 void nfcmrvl_chip_reset(struct nfcmrvl_private *priv)
 232 {
 233         /* Reset possible fault of previous session */
 234         clear_bit(NFCMRVL_PHY_ERROR, &priv->flags);
 235
 236         if (gpio_is_valid(priv->config.reset_n_io)) {
 237                 nfc_info(priv->dev, "reset the chip\n");
 238                 gpio_set_value(priv->config.reset_n_io, 0);
 239                 usleep_range(5000, 10000);
 240                 gpio_set_value(priv->config.reset_n_io, 1);
 241         } else
 242                 nfc_info(priv->dev, "no reset available on this interface\n");
 243 }
 244
 245 void nfcmrvl_chip_halt(struct nfcmrvl_private *priv)
 246 {
 247         if (gpio_is_valid(priv->config.reset_n_io))
 248                 gpio_set_value(priv->config.reset_n_io, 0);
 249 }
 250
 251 int nfcmrvl_parse_dt(struct device_node *node,
 252                      struct nfcmrvl_platform_data *pdata)
 253 {
 254         int reset_n_io;
 255
 256         reset_n_io = of_get_named_gpio(node, "reset-n-io", 0);
 257         if (reset_n_io < 0) {
 258                 pr_info("no reset-n-io config\n");
 259         } else if (!gpio_is_valid(reset_n_io)) {
 260                 pr_err("invalid reset-n-io GPIO\n");
 261                 return reset_n_io;
 262         }
 263         pdata->reset_n_io = reset_n_io;
 264
 265         if (of_find_property(node, "hci-muxed", NULL))
 266                 pdata->hci_muxed = 1;
 267         else
 268                 pdata->hci_muxed = 0;
 269
 270         return 0;
 271 }
 272 EXPORT_SYMBOL_GPL(nfcmrvl_parse_dt);
 273
 274 MODULE_AUTHOR("Marvell International Ltd.");
 275 MODULE_DESCRIPTION("Marvell NFC driver");
 276 MODULE_LICENSE("GPL v2");