diff options
Diffstat (limited to 'drivers/nfc/nfcmrvl/main.c')
| -rw-r--r-- | drivers/nfc/nfcmrvl/main.c | 276 |
1 files changed, 276 insertions, 0 deletions
diff --git a/drivers/nfc/nfcmrvl/main.c b/drivers/nfc/nfcmrvl/main.c new file mode 100644 index 000000000..1a5284de4 --- /dev/null +++ b/drivers/nfc/nfcmrvl/main.c @@ -0,0 +1,276 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * Marvell NFC driver: major functions + * + * Copyright (C) 2014-2015 Marvell International Ltd. + */ + +#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 = 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 const 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, + const struct nfcmrvl_if_ops *ops, + struct device *dev, + const 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 (gpio_is_valid(priv->config.reset_n_io)) { + rc = gpio_request_one(priv->config.reset_n_io, + GPIOF_OUT_INIT_LOW, + "nfcmrvl_reset_n"); + if (rc < 0) { + priv->config.reset_n_io = -EINVAL; + 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_free_gpio; + } + + rc = nfcmrvl_fw_dnld_init(priv); + if (rc) { + nfc_err(dev, "failed to initialize FW download %d\n", rc); + goto error_free_dev; + } + + 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_fw_dnld_deinit; + } + + /* Ensure that controller is powered off */ + nfcmrvl_chip_halt(priv); + + nfc_info(dev, "registered with nci successfully\n"); + return priv; + +error_fw_dnld_deinit: + nfcmrvl_fw_dnld_deinit(priv); +error_free_dev: + nci_free_device(priv->ndev); +error_free_gpio: + if (gpio_is_valid(priv->config.reset_n_io)) + gpio_free(priv->config.reset_n_io); + 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; + + nci_unregister_device(ndev); + if (priv->ndev->nfc_dev->fw_download_in_progress) + nfcmrvl_fw_dnld_abort(priv); + + nfcmrvl_fw_dnld_deinit(priv); + + if (gpio_is_valid(priv->config.reset_n_io)) + gpio_free(priv->config.reset_n_io); + + 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 (gpio_is_valid(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 (gpio_is_valid(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"); + } 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"); |