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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 | /* * Marvell NFC driver: major functions * * Copyright (C) 2014-2015 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. */ #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> #include "nfcmrvl.h" static int nfcmrvl_nci_open(struct nci_dev *ndev) { struct nfcmrvl_private *priv = nci_get_drvdata(ndev); int err; if (test_and_set_bit(NFCMRVL_NCI_RUNNING, &priv->flags)) return 0; /* Reset possible fault of previous session */ clear_bit(NFCMRVL_PHY_ERROR, &priv->flags); err = priv->if_ops->nci_open(priv); if (err) clear_bit(NFCMRVL_NCI_RUNNING, &priv->flags); return err; } static int nfcmrvl_nci_close(struct nci_dev *ndev) { struct nfcmrvl_private *priv = nci_get_drvdata(ndev); if (!test_and_clear_bit(NFCMRVL_NCI_RUNNING, &priv->flags)) return 0; priv->if_ops->nci_close(priv); return 0; } static int nfcmrvl_nci_send(struct nci_dev *ndev, struct sk_buff *skb) { struct nfcmrvl_private *priv = nci_get_drvdata(ndev); nfc_info(priv->dev, "send entry, len %d\n", skb->len); skb->dev = (void *)ndev; if (priv->config.hci_muxed) { unsigned char *hdr; unsigned char len = skb->len; hdr = (char *) skb_push(skb, NFCMRVL_HCI_EVENT_HEADER_SIZE); hdr[0] = NFCMRVL_HCI_COMMAND_CODE; hdr[1] = NFCMRVL_HCI_OGF; hdr[2] = NFCMRVL_HCI_OCF; hdr[3] = len; } return priv->if_ops->nci_send(priv, skb); } static int nfcmrvl_nci_setup(struct nci_dev *ndev) { __u8 val = 1; nci_set_config(ndev, NFCMRVL_PB_BAIL_OUT, 1, &val); return 0; } static int nfcmrvl_nci_fw_download(struct nci_dev *ndev, const char *firmware_name) { return nfcmrvl_fw_dnld_start(ndev, firmware_name); } static struct nci_ops nfcmrvl_nci_ops = { .open = nfcmrvl_nci_open, .close = nfcmrvl_nci_close, .send = nfcmrvl_nci_send, .setup = nfcmrvl_nci_setup, .fw_download = nfcmrvl_nci_fw_download, }; struct nfcmrvl_private *nfcmrvl_nci_register_dev(enum nfcmrvl_phy phy, void *drv_data, struct nfcmrvl_if_ops *ops, struct device *dev, struct nfcmrvl_platform_data *pdata) { struct nfcmrvl_private *priv; int rc; int headroom; int tailroom; u32 protocols; priv = kzalloc(sizeof(*priv), GFP_KERNEL); if (!priv) return ERR_PTR(-ENOMEM); priv->drv_data = drv_data; priv->if_ops = ops; priv->dev = dev; priv->phy = phy; memcpy(&priv->config, pdata, sizeof(*pdata)); if (priv->config.reset_n_io) { rc = devm_gpio_request_one(dev, 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 (phy == NFCMRVL_PHY_SPI) { headroom = NCI_SPI_HDR_LEN; tailroom = 1; } else headroom = tailroom = 0; 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_ISO14443_MASK | NFC_PROTO_ISO14443_B_MASK | NFC_PROTO_ISO15693_MASK | NFC_PROTO_NFC_DEP_MASK; priv->ndev = nci_allocate_device(&nfcmrvl_nci_ops, protocols, headroom, tailroom); if (!priv->ndev) { nfc_err(dev, "nci_allocate_device failed\n"); rc = -ENOMEM; goto error; } nci_set_drvdata(priv->ndev, priv); rc = nci_register_device(priv->ndev); if (rc) { nfc_err(dev, "nci_register_device failed %d\n", rc); goto error_free_dev; } /* Ensure that controller is powered off */ nfcmrvl_chip_halt(priv); rc = nfcmrvl_fw_dnld_init(priv); if (rc) { nfc_err(dev, "failed to initialize FW download %d\n", rc); goto error_free_dev; } nfc_info(dev, "registered with nci successfully\n"); return priv; error_free_dev: nci_free_device(priv->ndev); error: kfree(priv); return ERR_PTR(rc); } EXPORT_SYMBOL_GPL(nfcmrvl_nci_register_dev); void nfcmrvl_nci_unregister_dev(struct nfcmrvl_private *priv) { struct nci_dev *ndev = priv->ndev; if (priv->ndev->nfc_dev->fw_download_in_progress) nfcmrvl_fw_dnld_abort(priv); nfcmrvl_fw_dnld_deinit(priv); if (priv->config.reset_n_io) devm_gpio_free(priv->dev, priv->config.reset_n_io); nci_unregister_device(ndev); nci_free_device(ndev); kfree(priv); } EXPORT_SYMBOL_GPL(nfcmrvl_nci_unregister_dev); int nfcmrvl_nci_recv_frame(struct nfcmrvl_private *priv, struct sk_buff *skb) { 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 */ skb_pull(skb, NFCMRVL_HCI_EVENT_HEADER_SIZE); } else { /* Skip this packet */ kfree_skb(skb); return 0; } } if (priv->ndev->nfc_dev->fw_download_in_progress) { nfcmrvl_fw_dnld_recv_frame(priv, skb); return 0; } if (test_bit(NFCMRVL_NCI_RUNNING, &priv->flags)) nci_recv_frame(priv->ndev, skb); else { /* Drop this packet since nobody wants it */ kfree_skb(skb); return 0; } return 0; } EXPORT_SYMBOL_GPL(nfcmrvl_nci_recv_frame); void nfcmrvl_chip_reset(struct nfcmrvl_private *priv) { /* Reset possible fault of previous session */ clear_bit(NFCMRVL_PHY_ERROR, &priv->flags); if (priv->config.reset_n_io) { nfc_info(priv->dev, "reset the chip\n"); gpio_set_value(priv->config.reset_n_io, 0); usleep_range(5000, 10000); gpio_set_value(priv->config.reset_n_io, 1); } else nfc_info(priv->dev, "no reset available on this interface\n"); } void nfcmrvl_chip_halt(struct nfcmrvl_private *priv) { if (priv->config.reset_n_io) gpio_set_value(priv->config.reset_n_io, 0); } 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; } EXPORT_SYMBOL_GPL(nfcmrvl_parse_dt); MODULE_AUTHOR("Marvell International Ltd."); MODULE_DESCRIPTION("Marvell NFC driver"); MODULE_LICENSE("GPL v2"); |