kernel/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         /* Reset possible fault of previous session */
  37         clear_bit(NFCMRVL_PHY_ERROR, &priv->flags);
  38
  39         err = priv->if_ops->nci_open(priv);
  40
  41         if (err)
  42                 clear_bit(NFCMRVL_NCI_RUNNING, &priv->flags);
  43
  44         return err;
  45 }
  46
  47 static int nfcmrvl_nci_close(struct nci_dev *ndev)
  48 {
  49         struct nfcmrvl_private *priv = nci_get_drvdata(ndev);
  50
  51         if (!test_and_clear_bit(NFCMRVL_NCI_RUNNING, &priv->flags))
  52                 return 0;
  53
  54         priv->if_ops->nci_close(priv);
  55
  56         return 0;
  57 }
  58
  59 static int nfcmrvl_nci_send(struct nci_dev *ndev, struct sk_buff *skb)
  60 {
  61         struct nfcmrvl_private *priv = nci_get_drvdata(ndev);
  62
  63         nfc_info(priv->dev, "send entry, len %d\n", skb->len);
  64
  65         skb->dev = (void *)ndev;
  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 int nfcmrvl_nci_fw_download(struct nci_dev *ndev,
  90                                    const char *firmware_name)
  91 {
  92         return nfcmrvl_fw_dnld_start(ndev, firmware_name);
  93 }
  94
  95 static struct nci_ops nfcmrvl_nci_ops = {
  96         .open = nfcmrvl_nci_open,
  97         .close = nfcmrvl_nci_close,
  98         .send = nfcmrvl_nci_send,
  99         .setup = nfcmrvl_nci_setup,
 100         .fw_download = nfcmrvl_nci_fw_download,
 101 };
 102
 103 struct nfcmrvl_private *nfcmrvl_nci_register_dev(enum nfcmrvl_phy phy,
 104                                 void *drv_data,
 105                                 struct nfcmrvl_if_ops *ops,
 106                                 struct device *dev,
 107                                 struct nfcmrvl_platform_data *pdata)
 108 {
 109         struct nfcmrvl_private *priv;
 110         int rc;
 111         int headroom;
 112         int tailroom;
 113         u32 protocols;
 114
 115         priv = kzalloc(sizeof(*priv), GFP_KERNEL);
 116         if (!priv)
 117                 return ERR_PTR(-ENOMEM);
 118
 119         priv->drv_data = drv_data;
 120         priv->if_ops = ops;
 121         priv->dev = dev;
 122         priv->phy = phy;
 123
 124         memcpy(&priv->config, pdata, sizeof(*pdata));
 125
 126         if (priv->config.reset_n_io) {
 127                 rc = devm_gpio_request_one(dev,
 128                                            priv->config.reset_n_io,
 129                                            GPIOF_OUT_INIT_LOW,
 130                                            "nfcmrvl_reset_n");
 131                 if (rc < 0)
 132                         nfc_err(dev, "failed to request reset_n io\n");
 133         }
 134
 135         if (phy == NFCMRVL_PHY_SPI) {
 136                 headroom = NCI_SPI_HDR_LEN;
 137                 tailroom = 1;
 138         } else
 139                 headroom = tailroom = 0;
 140
 141         if (priv->config.hci_muxed)
 142                 headroom += NFCMRVL_HCI_EVENT_HEADER_SIZE;
 143
 144         protocols = NFC_PROTO_JEWEL_MASK
 145                 | NFC_PROTO_MIFARE_MASK
 146                 | NFC_PROTO_FELICA_MASK
 147                 | NFC_PROTO_ISO14443_MASK
 148                 | NFC_PROTO_ISO14443_B_MASK
 149                 | NFC_PROTO_ISO15693_MASK
 150                 | NFC_PROTO_NFC_DEP_MASK;
 151
 152         priv->ndev = nci_allocate_device(&nfcmrvl_nci_ops, protocols,
 153                                          headroom, tailroom);
 154         if (!priv->ndev) {
 155                 nfc_err(dev, "nci_allocate_device failed\n");
 156                 rc = -ENOMEM;
 157                 goto error;
 158         }
 159
 160         nci_set_drvdata(priv->ndev, priv);
 161
 162         rc = nci_register_device(priv->ndev);
 163         if (rc) {
 164                 nfc_err(dev, "nci_register_device failed %d\n", rc);
 165                 goto error_free_dev;
 166         }
 167
 168         /* Ensure that controller is powered off */
 169         nfcmrvl_chip_halt(priv);
 170
 171         rc = nfcmrvl_fw_dnld_init(priv);
 172         if (rc) {
 173                 nfc_err(dev, "failed to initialize FW download %d\n", rc);
 174                 goto error_free_dev;
 175         }
 176
 177         nfc_info(dev, "registered with nci successfully\n");
 178         return priv;
 179
 180 error_free_dev:
 181         nci_free_device(priv->ndev);
 182 error:
 183         kfree(priv);
 184         return ERR_PTR(rc);
 185 }
 186 EXPORT_SYMBOL_GPL(nfcmrvl_nci_register_dev);
 187
 188 void nfcmrvl_nci_unregister_dev(struct nfcmrvl_private *priv)
 189 {
 190         struct nci_dev *ndev = priv->ndev;
 191
 192         if (priv->ndev->nfc_dev->fw_download_in_progress)
 193                 nfcmrvl_fw_dnld_abort(priv);
 194
 195         nfcmrvl_fw_dnld_deinit(priv);
 196
 197         if (priv->config.reset_n_io)
 198                 devm_gpio_free(priv->dev, priv->config.reset_n_io);
 199
 200         nci_unregister_device(ndev);
 201         nci_free_device(ndev);
 202         kfree(priv);
 203 }
 204 EXPORT_SYMBOL_GPL(nfcmrvl_nci_unregister_dev);
 205
 206 int nfcmrvl_nci_recv_frame(struct nfcmrvl_private *priv, struct sk_buff *skb)
 207 {
 208         if (priv->config.hci_muxed) {
 209                 if (skb->data[0] == NFCMRVL_HCI_EVENT_CODE &&
 210                     skb->data[1] == NFCMRVL_HCI_NFC_EVENT_CODE) {
 211                         /* Data packet, let's extract NCI payload */
 212                         skb_pull(skb, NFCMRVL_HCI_EVENT_HEADER_SIZE);
 213                 } else {
 214                         /* Skip this packet */
 215                         kfree_skb(skb);
 216                         return 0;
 217                 }
 218         }
 219
 220         if (priv->ndev->nfc_dev->fw_download_in_progress) {
 221                 nfcmrvl_fw_dnld_recv_frame(priv, skb);
 222                 return 0;
 223         }
 224
 225         if (test_bit(NFCMRVL_NCI_RUNNING, &priv->flags))
 226                 nci_recv_frame(priv->ndev, skb);
 227         else {
 228                 /* Drop this packet since nobody wants it */
 229                 kfree_skb(skb);
 230                 return 0;
 231         }
 232
 233         return 0;
 234 }
 235 EXPORT_SYMBOL_GPL(nfcmrvl_nci_recv_frame);
 236
 237 void nfcmrvl_chip_reset(struct nfcmrvl_private *priv)
 238 {
 239         /* Reset possible fault of previous session */
 240         clear_bit(NFCMRVL_PHY_ERROR, &priv->flags);
 241
 242         if (priv->config.reset_n_io) {
 243                 nfc_info(priv->dev, "reset the chip\n");
 244                 gpio_set_value(priv->config.reset_n_io, 0);
 245                 usleep_range(5000, 10000);
 246                 gpio_set_value(priv->config.reset_n_io, 1);
 247         } else
 248                 nfc_info(priv->dev, "no reset available on this interface\n");
 249 }
 250
 251 void nfcmrvl_chip_halt(struct nfcmrvl_private *priv)
 252 {
 253         if (priv->config.reset_n_io)
 254                 gpio_set_value(priv->config.reset_n_io, 0);
 255 }
 256
 257 int nfcmrvl_parse_dt(struct device_node *node,
 258                      struct nfcmrvl_platform_data *pdata)
 259 {
 260         int reset_n_io;
 261
 262         reset_n_io = of_get_named_gpio(node, "reset-n-io", 0);
 263         if (reset_n_io < 0) {
 264                 pr_info("no reset-n-io config\n");
 265                 reset_n_io = 0;
 266         } else if (!gpio_is_valid(reset_n_io)) {
 267                 pr_err("invalid reset-n-io GPIO\n");
 268                 return reset_n_io;
 269         }
 270         pdata->reset_n_io = reset_n_io;
 271
 272         if (of_find_property(node, "hci-muxed", NULL))
 273                 pdata->hci_muxed = 1;
 274         else
 275                 pdata->hci_muxed = 0;
 276
 277         return 0;
 278 }
 279 EXPORT_SYMBOL_GPL(nfcmrvl_parse_dt);
 280
 281 MODULE_AUTHOR("Marvell International Ltd.");
 282 MODULE_DESCRIPTION("Marvell NFC driver");
 283 MODULE_LICENSE("GPL v2");