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alistair23-linux/drivers/nfc/nxp-nci/i2c.c
Thomas Gleixner 46fe777164 treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 399 
Based on 1 normalized pattern(s):

  this program is free software you can redistribute it and or modify
  it under the terms and conditions of the gnu general public license
  version 2 as published by the free software foundation this program
  is distributed in the hope that it will be useful but without any
  warranty without even the implied warranty of merchantability or
  fitness for a particular purpose see the gnu general public license
  for more details you should have received a copy of the gnu general
  public license along with this program if not see http www gnu org
  licenses

extracted by the scancode license scanner the SPDX license identifier

  GPL-2.0-only

has been chosen to replace the boilerplate/reference in 33 file(s).

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Reviewed-by: Allison Randal <allison@lohutok.net>
Reviewed-by: Kate Stewart <kstewart@linuxfoundation.org>
Cc: linux-spdx@vger.kernel.org
Link: https://lkml.kernel.org/r/20190531081038.745679586@linutronix.de
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2019-06-05 17:37:12 +02:00

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// SPDX-License-Identifier: GPL-2.0-only
/*
* I2C link layer for the NXP NCI driver
*
* Copyright (C) 2014 NXP Semiconductors All rights reserved.
* Copyright (C) 2012-2015 Intel Corporation. All rights reserved.
*
* Authors: Clément Perrochaud <clement.perrochaud@nxp.com>
* Authors: Oleg Zhurakivskyy <oleg.zhurakivskyy@intel.com>
*
* Derived from PN544 device driver:
* Copyright (C) 2012 Intel Corporation. All rights reserved.
*/
#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
#include <linux/acpi.h>
#include <linux/delay.h>
#include <linux/i2c.h>
#include <linux/interrupt.h>
#include <linux/module.h>
#include <linux/nfc.h>
#include <linux/gpio/consumer.h>
#include <linux/of_gpio.h>
#include <linux/of_irq.h>
#include <linux/platform_data/nxp-nci.h>
#include <asm/unaligned.h>
#include <net/nfc/nfc.h>
#include "nxp-nci.h"
#define NXP_NCI_I2C_DRIVER_NAME "nxp-nci_i2c"
#define NXP_NCI_I2C_MAX_PAYLOAD 32
struct nxp_nci_i2c_phy {
struct i2c_client *i2c_dev;
struct nci_dev *ndev;
unsigned int gpio_en;
unsigned int gpio_fw;
int hard_fault; /*
* < 0 if hardware error occurred (e.g. i2c err)
* and prevents normal operation.
*/
};
static int nxp_nci_i2c_set_mode(void *phy_id,
enum nxp_nci_mode mode)
{
struct nxp_nci_i2c_phy *phy = (struct nxp_nci_i2c_phy *) phy_id;
gpio_set_value(phy->gpio_fw, (mode == NXP_NCI_MODE_FW) ? 1 : 0);
gpio_set_value(phy->gpio_en, (mode != NXP_NCI_MODE_COLD) ? 1 : 0);
usleep_range(10000, 15000);
if (mode == NXP_NCI_MODE_COLD)
phy->hard_fault = 0;
return 0;
}
static int nxp_nci_i2c_write(void *phy_id, struct sk_buff *skb)
{
int r;
struct nxp_nci_i2c_phy *phy = phy_id;
struct i2c_client *client = phy->i2c_dev;
if (phy->hard_fault != 0)
return phy->hard_fault;
r = i2c_master_send(client, skb->data, skb->len);
if (r < 0) {
/* Retry, chip was in standby */
msleep(110);
r = i2c_master_send(client, skb->data, skb->len);
}
if (r < 0) {
nfc_err(&client->dev, "Error %d on I2C send\n", r);
} else if (r != skb->len) {
nfc_err(&client->dev,
"Invalid length sent: %u (expected %u)\n",
r, skb->len);
r = -EREMOTEIO;
} else {
/* Success but return 0 and not number of bytes */
r = 0;
}
return r;
}
static const struct nxp_nci_phy_ops i2c_phy_ops = {
.set_mode = nxp_nci_i2c_set_mode,
.write = nxp_nci_i2c_write,
};
static int nxp_nci_i2c_fw_read(struct nxp_nci_i2c_phy *phy,
struct sk_buff **skb)
{
struct i2c_client *client = phy->i2c_dev;
u16 header;
size_t frame_len;
int r;
r = i2c_master_recv(client, (u8 *) &header, NXP_NCI_FW_HDR_LEN);
if (r < 0) {
goto fw_read_exit;
} else if (r != NXP_NCI_FW_HDR_LEN) {
nfc_err(&client->dev, "Incorrect header length: %u\n", r);
r = -EBADMSG;
goto fw_read_exit;
}
frame_len = (be16_to_cpu(header) & NXP_NCI_FW_FRAME_LEN_MASK) +
NXP_NCI_FW_CRC_LEN;
*skb = alloc_skb(NXP_NCI_FW_HDR_LEN + frame_len, GFP_KERNEL);
if (*skb == NULL) {
r = -ENOMEM;
goto fw_read_exit;
}
skb_put_data(*skb, &header, NXP_NCI_FW_HDR_LEN);
r = i2c_master_recv(client, skb_put(*skb, frame_len), frame_len);
if (r != frame_len) {
nfc_err(&client->dev,
"Invalid frame length: %u (expected %zu)\n",
r, frame_len);
r = -EBADMSG;
goto fw_read_exit_free_skb;
}
return 0;
fw_read_exit_free_skb:
kfree_skb(*skb);
fw_read_exit:
return r;
}
static int nxp_nci_i2c_nci_read(struct nxp_nci_i2c_phy *phy,
struct sk_buff **skb)
{
struct nci_ctrl_hdr header; /* May actually be a data header */
struct i2c_client *client = phy->i2c_dev;
int r;
r = i2c_master_recv(client, (u8 *) &header, NCI_CTRL_HDR_SIZE);
if (r < 0) {
goto nci_read_exit;
} else if (r != NCI_CTRL_HDR_SIZE) {
nfc_err(&client->dev, "Incorrect header length: %u\n", r);
r = -EBADMSG;
goto nci_read_exit;
}
*skb = alloc_skb(NCI_CTRL_HDR_SIZE + header.plen, GFP_KERNEL);
if (*skb == NULL) {
r = -ENOMEM;
goto nci_read_exit;
}
skb_put_data(*skb, (void *)&header, NCI_CTRL_HDR_SIZE);
r = i2c_master_recv(client, skb_put(*skb, header.plen), header.plen);
if (r != header.plen) {
nfc_err(&client->dev,
"Invalid frame payload length: %u (expected %u)\n",
r, header.plen);
r = -EBADMSG;
goto nci_read_exit_free_skb;
}
return 0;
nci_read_exit_free_skb:
kfree_skb(*skb);
nci_read_exit:
return r;
}
static irqreturn_t nxp_nci_i2c_irq_thread_fn(int irq, void *phy_id)
{
struct nxp_nci_i2c_phy *phy = phy_id;
struct i2c_client *client;
struct nxp_nci_info *info;
struct sk_buff *skb = NULL;
int r = 0;
if (!phy || !phy->ndev)
goto exit_irq_none;
client = phy->i2c_dev;
if (!client || irq != client->irq)
goto exit_irq_none;
info = nci_get_drvdata(phy->ndev);
if (!info)
goto exit_irq_none;
mutex_lock(&info->info_lock);
if (phy->hard_fault != 0)
goto exit_irq_handled;
switch (info->mode) {
case NXP_NCI_MODE_NCI:
r = nxp_nci_i2c_nci_read(phy, &skb);
break;
case NXP_NCI_MODE_FW:
r = nxp_nci_i2c_fw_read(phy, &skb);
break;
case NXP_NCI_MODE_COLD:
r = -EREMOTEIO;
break;
}
if (r == -EREMOTEIO) {
phy->hard_fault = r;
skb = NULL;
} else if (r < 0) {
nfc_err(&client->dev, "Read failed with error %d\n", r);
goto exit_irq_handled;
}
switch (info->mode) {
case NXP_NCI_MODE_NCI:
nci_recv_frame(phy->ndev, skb);
break;
case NXP_NCI_MODE_FW:
nxp_nci_fw_recv_frame(phy->ndev, skb);
break;
case NXP_NCI_MODE_COLD:
break;
}
exit_irq_handled:
mutex_unlock(&info->info_lock);
return IRQ_HANDLED;
exit_irq_none:
WARN_ON_ONCE(1);
return IRQ_NONE;
}
static int nxp_nci_i2c_parse_devtree(struct i2c_client *client)
{
struct nxp_nci_i2c_phy *phy = i2c_get_clientdata(client);
struct device_node *pp;
int r;
pp = client->dev.of_node;
if (!pp)
return -ENODEV;
r = of_get_named_gpio(pp, "enable-gpios", 0);
if (r == -EPROBE_DEFER)
r = of_get_named_gpio(pp, "enable-gpios", 0);
if (r < 0) {
nfc_err(&client->dev, "Failed to get EN gpio, error: %d\n", r);
return r;
}
phy->gpio_en = r;
r = of_get_named_gpio(pp, "firmware-gpios", 0);
if (r == -EPROBE_DEFER)
r = of_get_named_gpio(pp, "firmware-gpios", 0);
if (r < 0) {
nfc_err(&client->dev, "Failed to get FW gpio, error: %d\n", r);
return r;
}
phy->gpio_fw = r;
return 0;
}
static int nxp_nci_i2c_acpi_config(struct nxp_nci_i2c_phy *phy)
{
struct i2c_client *client = phy->i2c_dev;
struct gpio_desc *gpiod_en, *gpiod_fw;
gpiod_en = devm_gpiod_get_index(&client->dev, NULL, 2, GPIOD_OUT_LOW);
gpiod_fw = devm_gpiod_get_index(&client->dev, NULL, 1, GPIOD_OUT_LOW);
if (IS_ERR(gpiod_en) || IS_ERR(gpiod_fw)) {
nfc_err(&client->dev, "No GPIOs\n");
return -EINVAL;
}
phy->gpio_en = desc_to_gpio(gpiod_en);
phy->gpio_fw = desc_to_gpio(gpiod_fw);
return 0;
}
static int nxp_nci_i2c_probe(struct i2c_client *client,
const struct i2c_device_id *id)
{
struct nxp_nci_i2c_phy *phy;
struct nxp_nci_nfc_platform_data *pdata;
int r;
if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C)) {
nfc_err(&client->dev, "Need I2C_FUNC_I2C\n");
r = -ENODEV;
goto probe_exit;
}
phy = devm_kzalloc(&client->dev, sizeof(struct nxp_nci_i2c_phy),
GFP_KERNEL);
if (!phy) {
r = -ENOMEM;
goto probe_exit;
}
phy->i2c_dev = client;
i2c_set_clientdata(client, phy);
pdata = client->dev.platform_data;
if (!pdata && client->dev.of_node) {
r = nxp_nci_i2c_parse_devtree(client);
if (r < 0) {
nfc_err(&client->dev, "Failed to get DT data\n");
goto probe_exit;
}
} else if (pdata) {
phy->gpio_en = pdata->gpio_en;
phy->gpio_fw = pdata->gpio_fw;
} else if (ACPI_HANDLE(&client->dev)) {
r = nxp_nci_i2c_acpi_config(phy);
if (r < 0)
goto probe_exit;
goto nci_probe;
} else {
nfc_err(&client->dev, "No platform data\n");
r = -EINVAL;
goto probe_exit;
}
r = devm_gpio_request_one(&phy->i2c_dev->dev, phy->gpio_en,
GPIOF_OUT_INIT_LOW, "nxp_nci_en");
if (r < 0)
goto probe_exit;
r = devm_gpio_request_one(&phy->i2c_dev->dev, phy->gpio_fw,
GPIOF_OUT_INIT_LOW, "nxp_nci_fw");
if (r < 0)
goto probe_exit;
nci_probe:
r = nxp_nci_probe(phy, &client->dev, &i2c_phy_ops,
NXP_NCI_I2C_MAX_PAYLOAD, &phy->ndev);
if (r < 0)
goto probe_exit;
r = request_threaded_irq(client->irq, NULL,
nxp_nci_i2c_irq_thread_fn,
IRQF_TRIGGER_RISING | IRQF_ONESHOT,
NXP_NCI_I2C_DRIVER_NAME, phy);
if (r < 0)
nfc_err(&client->dev, "Unable to register IRQ handler\n");
probe_exit:
return r;
}
static int nxp_nci_i2c_remove(struct i2c_client *client)
{
struct nxp_nci_i2c_phy *phy = i2c_get_clientdata(client);
nxp_nci_remove(phy->ndev);
free_irq(client->irq, phy);
return 0;
}
static const struct i2c_device_id nxp_nci_i2c_id_table[] = {
{"nxp-nci_i2c", 0},
{}
};
MODULE_DEVICE_TABLE(i2c, nxp_nci_i2c_id_table);
static const struct of_device_id of_nxp_nci_i2c_match[] = {
{ .compatible = "nxp,nxp-nci-i2c", },
{},
};
MODULE_DEVICE_TABLE(of, of_nxp_nci_i2c_match);
#ifdef CONFIG_ACPI
static struct acpi_device_id acpi_id[] = {
{ "NXP7471" },
{ },
};
MODULE_DEVICE_TABLE(acpi, acpi_id);
#endif
static struct i2c_driver nxp_nci_i2c_driver = {
.driver = {
.name = NXP_NCI_I2C_DRIVER_NAME,
.acpi_match_table = ACPI_PTR(acpi_id),
.of_match_table = of_match_ptr(of_nxp_nci_i2c_match),
},
.probe = nxp_nci_i2c_probe,
.id_table = nxp_nci_i2c_id_table,
.remove = nxp_nci_i2c_remove,
};
module_i2c_driver(nxp_nci_i2c_driver);
MODULE_LICENSE("GPL");
MODULE_DESCRIPTION("I2C driver for NXP NCI NFC controllers");
MODULE_AUTHOR("Clément Perrochaud <clement.perrochaud@nxp.com>");
MODULE_AUTHOR("Oleg Zhurakivskyy <oleg.zhurakivskyy@intel.com>");
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