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 (priv->config.hci_muxed) {
  65                 unsigned char *hdr;
  66                 unsigned char len = skb->len;
  67
  68                 hdr = (char *) skb_push(skb, NFCMRVL_HCI_EVENT_HEADER_SIZE);
  69                 hdr[0] = NFCMRVL_HCI_COMMAND_CODE;
  70                 hdr[1] = NFCMRVL_HCI_OGF;
  71                 hdr[2] = NFCMRVL_HCI_OCF;
  72                 hdr[3] = len;
  73         }
  74
  75         return priv->if_ops->nci_send(priv, skb);
  76 }
  77
  78 static int nfcmrvl_nci_setup(struct nci_dev *ndev)
  79 {
  80         __u8 val = 1;
  81
  82         nci_set_config(ndev, NFCMRVL_PB_BAIL_OUT, 1, &val);
  83         return 0;
  84 }
  85
  86 static int nfcmrvl_nci_fw_download(struct nci_dev *ndev,
  87                                    const char *firmware_name)
  88 {
  89         return nfcmrvl_fw_dnld_start(ndev, firmware_name);
  90 }
  91
  92 static struct nci_ops nfcmrvl_nci_ops = {
  93         .open = nfcmrvl_nci_open,
  94         .close = nfcmrvl_nci_close,
  95         .send = nfcmrvl_nci_send,
  96         .setup = nfcmrvl_nci_setup,
  97         .fw_download = nfcmrvl_nci_fw_download,
  98 };
  99
 100 struct nfcmrvl_private *nfcmrvl_nci_register_dev(enum nfcmrvl_phy phy,
 101                                 void *drv_data,
 102                                 struct nfcmrvl_if_ops *ops,
 103                                 struct device *dev,
 104                                 struct nfcmrvl_platform_data *pdata)
 105 {
 106         struct nfcmrvl_private *priv;
 107         int rc;
 108         int headroom;
 109         int tailroom;
 110         u32 protocols;
 111
 112         priv = kzalloc(sizeof(*priv), GFP_KERNEL);
 113         if (!priv)
 114                 return ERR_PTR(-ENOMEM);
 115
 116         priv->drv_data = drv_data;
 117         priv->if_ops = ops;
 118         priv->dev = dev;
 119         priv->phy = phy;
 120
 121         memcpy(&priv->config, pdata, sizeof(*pdata));
 122
 123         if (priv->config.reset_n_io) {
 124                 rc = devm_gpio_request_one(dev,
 125                                            priv->config.reset_n_io,
 126                                            GPIOF_OUT_INIT_LOW,
 127                                            "nfcmrvl_reset_n");
 128                 if (rc < 0)
 129                         nfc_err(dev, "failed to request reset_n io\n");
 130         }
 131
 132         headroom = tailroom = 0;
 133
 134         if (priv->config.hci_muxed)
 135                 headroom += NFCMRVL_HCI_EVENT_HEADER_SIZE;
 136
 137         protocols = NFC_PROTO_JEWEL_MASK
 138                 | NFC_PROTO_MIFARE_MASK
 139                 | NFC_PROTO_FELICA_MASK
 140                 | NFC_PROTO_ISO14443_MASK
 141                 | NFC_PROTO_ISO14443_B_MASK
 142                 | NFC_PROTO_ISO15693_MASK
 143                 | NFC_PROTO_NFC_DEP_MASK;
 144
 145         priv->ndev = nci_allocate_device(&nfcmrvl_nci_ops, protocols,
 146                                          headroom, tailroom);
 147         if (!priv->ndev) {
 148                 nfc_err(dev, "nci_allocate_device failed\n");
 149                 rc = -ENOMEM;
 150                 goto error;
 151         }
 152
 153         nci_set_drvdata(priv->ndev, priv);
 154
 155         rc = nci_register_device(priv->ndev);
 156         if (rc) {
 157                 nfc_err(dev, "nci_register_device failed %d\n", rc);
 158                 goto error_free_dev;
 159         }
 160
 161         /* Ensure that controller is powered off */
 162         nfcmrvl_chip_halt(priv);
 163
 164         rc = nfcmrvl_fw_dnld_init(priv);
 165         if (rc) {
 166                 nfc_err(dev, "failed to initialize FW download %d\n", rc);
 167                 goto error_free_dev;
 168         }
 169
 170         nfc_info(dev, "registered with nci successfully\n");
 171         return priv;
 172
 173 error_free_dev:
 174         nci_free_device(priv->ndev);
 175 error:
 176         kfree(priv);
 177         return ERR_PTR(rc);
 178 }
 179 EXPORT_SYMBOL_GPL(nfcmrvl_nci_register_dev);
 180
 181 void nfcmrvl_nci_unregister_dev(struct nfcmrvl_private *priv)
 182 {
 183         struct nci_dev *ndev = priv->ndev;
 184
 185         if (priv->ndev->nfc_dev->fw_download_in_progress)
 186                 nfcmrvl_fw_dnld_abort(priv);
 187
 188         nfcmrvl_fw_dnld_deinit(priv);
 189
 190         nci_unregister_device(ndev);
 191         nci_free_device(ndev);
 192         kfree(priv);
 193 }
 194 EXPORT_SYMBOL_GPL(nfcmrvl_nci_unregister_dev);
 195
 196 int nfcmrvl_nci_recv_frame(struct nfcmrvl_private *priv, struct sk_buff *skb)
 197 {
 198         if (priv->config.hci_muxed) {
 199                 if (skb->data[0] == NFCMRVL_HCI_EVENT_CODE &&
 200                     skb->data[1] == NFCMRVL_HCI_NFC_EVENT_CODE) {
 201                         /* Data packet, let's extract NCI payload */
 202                         skb_pull(skb, NFCMRVL_HCI_EVENT_HEADER_SIZE);
 203                 } else {
 204                         /* Skip this packet */
 205                         kfree_skb(skb);
 206                         return 0;
 207                 }
 208         }
 209
 210         if (priv->ndev->nfc_dev->fw_download_in_progress) {
 211                 nfcmrvl_fw_dnld_recv_frame(priv, skb);
 212                 return 0;
 213         }
 214
 215         if (test_bit(NFCMRVL_NCI_RUNNING, &priv->flags))
 216                 nci_recv_frame(priv->ndev, skb);
 217         else {
 218                 /* Drop this packet since nobody wants it */
 219                 kfree_skb(skb);
 220                 return 0;
 221         }
 222
 223         return 0;
 224 }
 225 EXPORT_SYMBOL_GPL(nfcmrvl_nci_recv_frame);
 226
 227 void nfcmrvl_chip_reset(struct nfcmrvl_private *priv)
 228 {
 229         /*
 230          * This function does not take care if someone is using the device.
 231          * To be improved.
 232          */
 233
 234         if (priv->config.reset_n_io) {
 235                 nfc_info(priv->dev, "reset the chip\n");
 236                 gpio_set_value(priv->config.reset_n_io, 0);
 237                 usleep_range(5000, 10000);
 238                 gpio_set_value(priv->config.reset_n_io, 1);
 239         } else
 240                 nfc_info(priv->dev, "no reset available on this interface\n");
 241 }
 242
 243 void nfcmrvl_chip_halt(struct nfcmrvl_private *priv)
 244 {
 245         if (priv->config.reset_n_io)
 246                 gpio_set_value(priv->config.reset_n_io, 0);
 247 }
 248
 249 #ifdef CONFIG_OF
 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                 reset_n_io = 0;
 260         } else if (!gpio_is_valid(reset_n_io)) {
 261                 pr_err("invalid reset-n-io GPIO\n");
 262                 return reset_n_io;
 263         }
 264         pdata->reset_n_io = reset_n_io;
 265
 266         if (of_find_property(node, "hci-muxed", NULL))
 267                 pdata->hci_muxed = 1;
 268         else
 269                 pdata->hci_muxed = 0;
 270
 271         return 0;
 272 }
 273
 274 #else
 275
 276 int nfcmrvl_parse_dt(struct device_node *node,
 277                      struct nfcmrvl_platform_data *pdata)
 278 {
 279         return -ENODEV;
 280 }
 281
 282 #endif
 283 EXPORT_SYMBOL_GPL(nfcmrvl_parse_dt);
 284
 285 MODULE_AUTHOR("Marvell International Ltd.");
 286 MODULE_DESCRIPTION("Marvell NFC driver");
 287 MODULE_LICENSE("GPL v2");