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 const 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 const struct nfcmrvl_if_ops *ops, 95 struct device *dev, 96 const 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"); 277