361 lines
8.1 KiB
C
361 lines
8.1 KiB
C
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// SPDX-License-Identifier: GPL-2.0-only
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/*
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* I2C link layer for the NXP NCI driver
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*
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* Copyright (C) 2014 NXP Semiconductors All rights reserved.
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* Copyright (C) 2012-2015 Intel Corporation. All rights reserved.
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*
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* Authors: Clément Perrochaud <clement.perrochaud@nxp.com>
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* Authors: Oleg Zhurakivskyy <oleg.zhurakivskyy@intel.com>
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*
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* Derived from PN544 device driver:
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* Copyright (C) 2012 Intel Corporation. All rights reserved.
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*/
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#include <linux/acpi.h>
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#include <linux/delay.h>
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#include <linux/i2c.h>
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#include <linux/interrupt.h>
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#include <linux/module.h>
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#include <linux/nfc.h>
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#include <linux/gpio/consumer.h>
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#include <asm/unaligned.h>
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#include <net/nfc/nfc.h>
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#include "nxp-nci.h"
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#define NXP_NCI_I2C_DRIVER_NAME "nxp-nci_i2c"
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#define NXP_NCI_I2C_MAX_PAYLOAD 32
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struct nxp_nci_i2c_phy {
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struct i2c_client *i2c_dev;
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struct nci_dev *ndev;
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struct gpio_desc *gpiod_en;
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struct gpio_desc *gpiod_fw;
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int hard_fault; /*
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* < 0 if hardware error occurred (e.g. i2c err)
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* and prevents normal operation.
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*/
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};
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static int nxp_nci_i2c_set_mode(void *phy_id,
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enum nxp_nci_mode mode)
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{
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struct nxp_nci_i2c_phy *phy = (struct nxp_nci_i2c_phy *) phy_id;
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gpiod_set_value(phy->gpiod_fw, (mode == NXP_NCI_MODE_FW) ? 1 : 0);
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gpiod_set_value(phy->gpiod_en, (mode != NXP_NCI_MODE_COLD) ? 1 : 0);
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usleep_range(10000, 15000);
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if (mode == NXP_NCI_MODE_COLD)
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phy->hard_fault = 0;
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return 0;
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}
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static int nxp_nci_i2c_write(void *phy_id, struct sk_buff *skb)
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{
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int r;
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struct nxp_nci_i2c_phy *phy = phy_id;
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struct i2c_client *client = phy->i2c_dev;
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if (phy->hard_fault != 0)
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return phy->hard_fault;
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r = i2c_master_send(client, skb->data, skb->len);
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if (r < 0) {
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/* Retry, chip was in standby */
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msleep(110);
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r = i2c_master_send(client, skb->data, skb->len);
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}
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if (r < 0) {
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nfc_err(&client->dev, "Error %d on I2C send\n", r);
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} else if (r != skb->len) {
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nfc_err(&client->dev,
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"Invalid length sent: %u (expected %u)\n",
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r, skb->len);
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r = -EREMOTEIO;
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} else {
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/* Success but return 0 and not number of bytes */
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r = 0;
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}
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return r;
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}
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static const struct nxp_nci_phy_ops i2c_phy_ops = {
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.set_mode = nxp_nci_i2c_set_mode,
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.write = nxp_nci_i2c_write,
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};
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static int nxp_nci_i2c_fw_read(struct nxp_nci_i2c_phy *phy,
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struct sk_buff **skb)
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{
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struct i2c_client *client = phy->i2c_dev;
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u16 header;
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size_t frame_len;
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int r;
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r = i2c_master_recv(client, (u8 *) &header, NXP_NCI_FW_HDR_LEN);
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if (r < 0) {
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goto fw_read_exit;
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} else if (r != NXP_NCI_FW_HDR_LEN) {
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nfc_err(&client->dev, "Incorrect header length: %u\n", r);
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r = -EBADMSG;
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goto fw_read_exit;
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}
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frame_len = (be16_to_cpu(header) & NXP_NCI_FW_FRAME_LEN_MASK) +
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NXP_NCI_FW_CRC_LEN;
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*skb = alloc_skb(NXP_NCI_FW_HDR_LEN + frame_len, GFP_KERNEL);
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if (*skb == NULL) {
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r = -ENOMEM;
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goto fw_read_exit;
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}
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skb_put_data(*skb, &header, NXP_NCI_FW_HDR_LEN);
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r = i2c_master_recv(client, skb_put(*skb, frame_len), frame_len);
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if (r != frame_len) {
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nfc_err(&client->dev,
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"Invalid frame length: %u (expected %zu)\n",
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r, frame_len);
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r = -EBADMSG;
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goto fw_read_exit_free_skb;
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}
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return 0;
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fw_read_exit_free_skb:
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kfree_skb(*skb);
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fw_read_exit:
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return r;
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}
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static int nxp_nci_i2c_nci_read(struct nxp_nci_i2c_phy *phy,
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struct sk_buff **skb)
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{
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struct nci_ctrl_hdr header; /* May actually be a data header */
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struct i2c_client *client = phy->i2c_dev;
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int r;
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r = i2c_master_recv(client, (u8 *) &header, NCI_CTRL_HDR_SIZE);
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if (r < 0) {
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goto nci_read_exit;
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} else if (r != NCI_CTRL_HDR_SIZE) {
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nfc_err(&client->dev, "Incorrect header length: %u\n", r);
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r = -EBADMSG;
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goto nci_read_exit;
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}
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*skb = alloc_skb(NCI_CTRL_HDR_SIZE + header.plen, GFP_KERNEL);
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if (*skb == NULL) {
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r = -ENOMEM;
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goto nci_read_exit;
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}
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skb_put_data(*skb, (void *)&header, NCI_CTRL_HDR_SIZE);
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if (!header.plen)
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return 0;
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r = i2c_master_recv(client, skb_put(*skb, header.plen), header.plen);
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if (r != header.plen) {
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nfc_err(&client->dev,
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"Invalid frame payload length: %u (expected %u)\n",
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r, header.plen);
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r = -EBADMSG;
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goto nci_read_exit_free_skb;
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}
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return 0;
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nci_read_exit_free_skb:
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kfree_skb(*skb);
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nci_read_exit:
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return r;
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}
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static irqreturn_t nxp_nci_i2c_irq_thread_fn(int irq, void *phy_id)
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{
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struct nxp_nci_i2c_phy *phy = phy_id;
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struct i2c_client *client;
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struct nxp_nci_info *info;
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struct sk_buff *skb = NULL;
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int r = 0;
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if (!phy || !phy->ndev)
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goto exit_irq_none;
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client = phy->i2c_dev;
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if (!client || irq != client->irq)
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goto exit_irq_none;
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info = nci_get_drvdata(phy->ndev);
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if (!info)
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goto exit_irq_none;
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mutex_lock(&info->info_lock);
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if (phy->hard_fault != 0)
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goto exit_irq_handled;
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switch (info->mode) {
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case NXP_NCI_MODE_NCI:
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r = nxp_nci_i2c_nci_read(phy, &skb);
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break;
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case NXP_NCI_MODE_FW:
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r = nxp_nci_i2c_fw_read(phy, &skb);
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break;
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case NXP_NCI_MODE_COLD:
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r = -EREMOTEIO;
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break;
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}
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if (r == -EREMOTEIO) {
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phy->hard_fault = r;
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if (info->mode == NXP_NCI_MODE_FW)
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nxp_nci_fw_recv_frame(phy->ndev, NULL);
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}
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if (r < 0) {
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nfc_err(&client->dev, "Read failed with error %d\n", r);
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goto exit_irq_handled;
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}
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switch (info->mode) {
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case NXP_NCI_MODE_NCI:
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nci_recv_frame(phy->ndev, skb);
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break;
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case NXP_NCI_MODE_FW:
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nxp_nci_fw_recv_frame(phy->ndev, skb);
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break;
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case NXP_NCI_MODE_COLD:
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break;
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}
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exit_irq_handled:
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mutex_unlock(&info->info_lock);
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return IRQ_HANDLED;
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exit_irq_none:
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WARN_ON_ONCE(1);
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return IRQ_NONE;
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}
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static const struct acpi_gpio_params firmware_gpios = { 1, 0, false };
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static const struct acpi_gpio_params enable_gpios = { 2, 0, false };
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static const struct acpi_gpio_mapping acpi_nxp_nci_gpios[] = {
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{ "enable-gpios", &enable_gpios, 1 },
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{ "firmware-gpios", &firmware_gpios, 1 },
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{ }
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};
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static int nxp_nci_i2c_probe(struct i2c_client *client,
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const struct i2c_device_id *id)
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{
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struct device *dev = &client->dev;
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struct nxp_nci_i2c_phy *phy;
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int r;
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if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C)) {
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nfc_err(&client->dev, "Need I2C_FUNC_I2C\n");
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return -ENODEV;
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}
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phy = devm_kzalloc(&client->dev, sizeof(struct nxp_nci_i2c_phy),
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GFP_KERNEL);
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if (!phy)
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return -ENOMEM;
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phy->i2c_dev = client;
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i2c_set_clientdata(client, phy);
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r = devm_acpi_dev_add_driver_gpios(dev, acpi_nxp_nci_gpios);
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if (r)
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dev_dbg(dev, "Unable to add GPIO mapping table\n");
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phy->gpiod_en = devm_gpiod_get(dev, "enable", GPIOD_OUT_LOW);
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if (IS_ERR(phy->gpiod_en)) {
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nfc_err(dev, "Failed to get EN gpio\n");
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return PTR_ERR(phy->gpiod_en);
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}
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phy->gpiod_fw = devm_gpiod_get_optional(dev, "firmware", GPIOD_OUT_LOW);
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if (IS_ERR(phy->gpiod_fw)) {
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nfc_err(dev, "Failed to get FW gpio\n");
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return PTR_ERR(phy->gpiod_fw);
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}
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r = nxp_nci_probe(phy, &client->dev, &i2c_phy_ops,
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NXP_NCI_I2C_MAX_PAYLOAD, &phy->ndev);
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if (r < 0)
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return r;
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r = request_threaded_irq(client->irq, NULL,
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nxp_nci_i2c_irq_thread_fn,
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IRQF_TRIGGER_RISING | IRQF_ONESHOT,
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NXP_NCI_I2C_DRIVER_NAME, phy);
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if (r < 0)
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nfc_err(&client->dev, "Unable to register IRQ handler\n");
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return r;
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}
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static int nxp_nci_i2c_remove(struct i2c_client *client)
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{
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struct nxp_nci_i2c_phy *phy = i2c_get_clientdata(client);
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nxp_nci_remove(phy->ndev);
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free_irq(client->irq, phy);
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return 0;
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}
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static const struct i2c_device_id nxp_nci_i2c_id_table[] = {
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{"nxp-nci_i2c", 0},
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{}
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};
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MODULE_DEVICE_TABLE(i2c, nxp_nci_i2c_id_table);
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static const struct of_device_id of_nxp_nci_i2c_match[] = {
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{ .compatible = "nxp,nxp-nci-i2c", },
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{}
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};
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MODULE_DEVICE_TABLE(of, of_nxp_nci_i2c_match);
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#ifdef CONFIG_ACPI
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static const struct acpi_device_id acpi_id[] = {
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{ "NXP1001" },
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{ "NXP7471" },
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{ }
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};
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MODULE_DEVICE_TABLE(acpi, acpi_id);
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#endif
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static struct i2c_driver nxp_nci_i2c_driver = {
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.driver = {
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.name = NXP_NCI_I2C_DRIVER_NAME,
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.acpi_match_table = ACPI_PTR(acpi_id),
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.of_match_table = of_nxp_nci_i2c_match,
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},
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.probe = nxp_nci_i2c_probe,
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.id_table = nxp_nci_i2c_id_table,
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.remove = nxp_nci_i2c_remove,
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};
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module_i2c_driver(nxp_nci_i2c_driver);
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MODULE_LICENSE("GPL");
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MODULE_DESCRIPTION("I2C driver for NXP NCI NFC controllers");
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MODULE_AUTHOR("Clément Perrochaud <clement.perrochaud@nxp.com>");
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MODULE_AUTHOR("Oleg Zhurakivskyy <oleg.zhurakivskyy@intel.com>");
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