e3c95d5619
Core in spi_register_driver() already sets the .owner, so driver does not need to. Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org> Link: https://lore.kernel.org/r/20240327174810.519676-3-krzysztof.kozlowski@linaro.org Signed-off-by: Jakub Kicinski <kuba@kernel.org>
211 lines
5.0 KiB
C
211 lines
5.0 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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* Marvell NFC-over-SPI driver: SPI interface related functions
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*
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* Copyright (C) 2015, Marvell International Ltd.
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*/
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#include <linux/module.h>
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#include <linux/interrupt.h>
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#include <linux/nfc.h>
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#include <linux/of_irq.h>
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#include <net/nfc/nci.h>
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#include <net/nfc/nci_core.h>
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#include <linux/spi/spi.h>
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#include "nfcmrvl.h"
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#define SPI_WAIT_HANDSHAKE 1
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struct nfcmrvl_spi_drv_data {
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unsigned long flags;
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struct spi_device *spi;
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struct nci_spi *nci_spi;
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struct completion handshake_completion;
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struct nfcmrvl_private *priv;
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};
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static irqreturn_t nfcmrvl_spi_int_irq_thread_fn(int irq, void *drv_data_ptr)
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{
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struct nfcmrvl_spi_drv_data *drv_data = drv_data_ptr;
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struct sk_buff *skb;
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/*
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* Special case where we are waiting for SPI_INT deassertion to start a
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* transfer.
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*/
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if (test_and_clear_bit(SPI_WAIT_HANDSHAKE, &drv_data->flags)) {
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complete(&drv_data->handshake_completion);
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return IRQ_HANDLED;
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}
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/* Normal case, SPI_INT deasserted by slave to trigger a master read */
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skb = nci_spi_read(drv_data->nci_spi);
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if (!skb) {
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nfc_err(&drv_data->spi->dev, "failed to read spi packet");
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return IRQ_HANDLED;
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}
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if (nfcmrvl_nci_recv_frame(drv_data->priv, skb) < 0)
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nfc_err(&drv_data->spi->dev, "corrupted RX packet");
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return IRQ_HANDLED;
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}
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static int nfcmrvl_spi_nci_open(struct nfcmrvl_private *priv)
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{
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return 0;
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}
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static int nfcmrvl_spi_nci_close(struct nfcmrvl_private *priv)
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{
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return 0;
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}
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static int nfcmrvl_spi_nci_send(struct nfcmrvl_private *priv,
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struct sk_buff *skb)
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{
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struct nfcmrvl_spi_drv_data *drv_data = priv->drv_data;
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int err;
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/* Reinit completion for slave handshake */
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reinit_completion(&drv_data->handshake_completion);
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set_bit(SPI_WAIT_HANDSHAKE, &drv_data->flags);
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/*
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* Append a dummy byte at the end of SPI frame. This is due to a
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* specific DMA implementation in the controller
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*/
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skb_put(skb, 1);
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/* Send the SPI packet */
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err = nci_spi_send(drv_data->nci_spi, &drv_data->handshake_completion,
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skb);
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if (err)
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nfc_err(priv->dev, "spi_send failed %d", err);
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return err;
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}
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static void nfcmrvl_spi_nci_update_config(struct nfcmrvl_private *priv,
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const void *param)
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{
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struct nfcmrvl_spi_drv_data *drv_data = priv->drv_data;
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const struct nfcmrvl_fw_spi_config *config = param;
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drv_data->nci_spi->xfer_speed_hz = config->clk;
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}
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static const struct nfcmrvl_if_ops spi_ops = {
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.nci_open = nfcmrvl_spi_nci_open,
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.nci_close = nfcmrvl_spi_nci_close,
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.nci_send = nfcmrvl_spi_nci_send,
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.nci_update_config = nfcmrvl_spi_nci_update_config,
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};
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static int nfcmrvl_spi_parse_dt(struct device_node *node,
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struct nfcmrvl_platform_data *pdata)
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{
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int ret;
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ret = nfcmrvl_parse_dt(node, pdata);
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if (ret < 0) {
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pr_err("Failed to get generic entries\n");
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return ret;
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}
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ret = irq_of_parse_and_map(node, 0);
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if (!ret) {
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pr_err("Unable to get irq\n");
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return -EINVAL;
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}
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pdata->irq = ret;
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return 0;
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}
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static int nfcmrvl_spi_probe(struct spi_device *spi)
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{
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const struct nfcmrvl_platform_data *pdata;
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struct nfcmrvl_platform_data config;
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struct nfcmrvl_spi_drv_data *drv_data;
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int ret = 0;
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drv_data = devm_kzalloc(&spi->dev, sizeof(*drv_data), GFP_KERNEL);
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if (!drv_data)
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return -ENOMEM;
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drv_data->spi = spi;
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drv_data->priv = NULL;
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spi_set_drvdata(spi, drv_data);
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pdata = spi->dev.platform_data;
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if (!pdata && spi->dev.of_node)
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if (nfcmrvl_spi_parse_dt(spi->dev.of_node, &config) == 0)
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pdata = &config;
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if (!pdata)
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return -EINVAL;
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ret = devm_request_threaded_irq(&drv_data->spi->dev, pdata->irq,
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NULL, nfcmrvl_spi_int_irq_thread_fn,
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IRQF_TRIGGER_FALLING | IRQF_ONESHOT,
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"nfcmrvl_spi_int", drv_data);
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if (ret < 0) {
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nfc_err(&drv_data->spi->dev, "Unable to register IRQ handler");
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return -ENODEV;
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}
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drv_data->priv = nfcmrvl_nci_register_dev(NFCMRVL_PHY_SPI,
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drv_data, &spi_ops,
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&drv_data->spi->dev,
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pdata);
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if (IS_ERR(drv_data->priv))
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return PTR_ERR(drv_data->priv);
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drv_data->priv->support_fw_dnld = true;
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drv_data->nci_spi = nci_spi_allocate_spi(drv_data->spi, 0, 10,
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drv_data->priv->ndev);
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/* Init completion for slave handshake */
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init_completion(&drv_data->handshake_completion);
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return 0;
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}
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static void nfcmrvl_spi_remove(struct spi_device *spi)
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{
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struct nfcmrvl_spi_drv_data *drv_data = spi_get_drvdata(spi);
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nfcmrvl_nci_unregister_dev(drv_data->priv);
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}
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static const struct of_device_id of_nfcmrvl_spi_match[] __maybe_unused = {
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{ .compatible = "marvell,nfc-spi", },
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{},
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};
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MODULE_DEVICE_TABLE(of, of_nfcmrvl_spi_match);
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static const struct spi_device_id nfcmrvl_spi_id_table[] = {
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{ "nfcmrvl_spi", 0 },
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{ }
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};
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MODULE_DEVICE_TABLE(spi, nfcmrvl_spi_id_table);
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static struct spi_driver nfcmrvl_spi_driver = {
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.probe = nfcmrvl_spi_probe,
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.remove = nfcmrvl_spi_remove,
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.id_table = nfcmrvl_spi_id_table,
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.driver = {
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.name = "nfcmrvl_spi",
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.of_match_table = of_match_ptr(of_nfcmrvl_spi_match),
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},
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};
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module_spi_driver(nfcmrvl_spi_driver);
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MODULE_AUTHOR("Marvell International Ltd.");
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MODULE_DESCRIPTION("Marvell NFC-over-SPI driver");
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MODULE_LICENSE("GPL v2");
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