NFC: nxp-nci_i2c: Add I2C support to NXP NCI driver
Add a module to the NXP-NCI driver to support NFC controllers with an I2C control interface, such as the NPC100. Signed-off-by: Clément Perrochaud <clement.perrochaud@effinnov.com> Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>
This commit is contained in:
Clément Perrochaud
Samuel Ortiz
Родитель
dece45855a
Коммит
6be88670fc
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@ -0,0 +1,35 @@
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* NXP Semiconductors NXP NCI NFC Controllers
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Required properties:
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- compatible: Should be "nxp,nxp-nci-i2c".
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- clock-frequency: I²C work frequency.
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- reg: address on the bus
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- interrupt-parent: phandle for the interrupt gpio controller
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- interrupts: GPIO interrupt to which the chip is connected
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- enable-gpios: Output GPIO pin used for enabling/disabling the chip
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- firmware-gpios: Output GPIO pin used to enter firmware download mode
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Optional SoC Specific Properties:
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- pinctrl-names: Contains only one value - "default".
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- pintctrl-0: Specifies the pin control groups used for this controller.
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Example (for ARM-based BeagleBone with NPC100 NFC controller on I2C2):
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&i2c2 {
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status = "okay";
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npc100: npc100@29 {
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compatible = "nxp,nxp-nci-i2c";
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reg = <0x29>;
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clock-frequency = <100000>;
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interrupt-parent = <&gpio1>;
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interrupts = <29 GPIO_ACTIVE_HIGH>;
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enable-gpios = <&gpio0 30 GPIO_ACTIVE_HIGH>;
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firmware-gpios = <&gpio0 31 GPIO_ACTIVE_HIGH>;
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};
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};
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@ -11,3 +11,15 @@ config NFC_NXP_NCI
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To compile this driver as a module, choose m here. The module will
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be called nxp_nci.
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Say N if unsure.
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config NFC_NXP_NCI_I2C
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tristate "NXP-NCI I2C support"
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depends on NFC_NXP_NCI && I2C
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---help---
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This module adds support for an I2C interface to the NXP NCI
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chips.
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Select this if your platform is using the I2C bus.
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To compile this driver as a module, choose m here. The module will
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be called nxp_nci_i2c.
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Say Y if unsure.
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@ -3,7 +3,9 @@
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#
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nxp-nci-objs = core.o firmware.o
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nxp-nci_i2c-objs = i2c.o
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obj-$(CONFIG_NFC_NXP_NCI) += nxp-nci.o
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obj-$(CONFIG_NFC_NXP_NCI_I2C) += nxp-nci_i2c.o
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ccflags-$(CONFIG_NFC_DEBUG) := -DDEBUG
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@ -0,0 +1,415 @@
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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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*
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* Authors: Clément Perrochaud <clement.perrochaud@nxp.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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* This program is free software; you can redistribute it and/or modify it
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* under the terms and conditions of the GNU General Public License,
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* version 2, as published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, see <http://www.gnu.org/licenses/>.
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*/
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#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
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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/miscdevice.h>
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#include <linux/module.h>
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#include <linux/nfc.h>
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#include <linux/of_gpio.h>
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#include <linux/of_irq.h>
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#include <linux/platform_data/nxp-nci.h>
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#include <linux/unaligned/access_ok.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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unsigned int gpio_en;
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unsigned int gpio_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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gpio_set_value(phy->gpio_fw, (mode == NXP_NCI_MODE_FW) ? 1 : 0);
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gpio_set_value(phy->gpio_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 == -EREMOTEIO) {
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/* Retry, chip was in standby */
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usleep_range(110000, 120000);
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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 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 = (get_unaligned_be16(&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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memcpy(skb_put(*skb, NXP_NCI_FW_HDR_LEN), &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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memcpy(skb_put(*skb, NCI_CTRL_HDR_SIZE), (void *) &header,
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NCI_CTRL_HDR_SIZE);
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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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skb = NULL;
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} else 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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#ifdef CONFIG_OF
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static int nxp_nci_i2c_parse_devtree(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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struct device_node *pp;
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int r;
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pp = client->dev.of_node;
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if (!pp)
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return -ENODEV;
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r = of_get_named_gpio(pp, "enable-gpios", 0);
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if (r == -EPROBE_DEFER)
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r = of_get_named_gpio(pp, "enable-gpios", 0);
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if (r < 0) {
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nfc_err(&client->dev, "Failed to get EN gpio, error: %d\n", r);
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return r;
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}
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phy->gpio_en = r;
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|
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r = of_get_named_gpio(pp, "firmware-gpios", 0);
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if (r == -EPROBE_DEFER)
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r = of_get_named_gpio(pp, "firmware-gpios", 0);
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if (r < 0) {
|
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nfc_err(&client->dev, "Failed to get FW gpio, error: %d\n", r);
|
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return r;
|
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}
|
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phy->gpio_fw = r;
|
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|
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r = irq_of_parse_and_map(pp, 0);
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if (r < 0) {
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nfc_err(&client->dev, "Unable to get irq, error: %d\n", r);
|
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return r;
|
||||
}
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client->irq = r;
|
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|
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return 0;
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}
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|
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#else
|
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|
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static int nxp_nci_i2c_parse_devtree(struct i2c_client *client)
|
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{
|
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return -ENODEV;
|
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}
|
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|
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#endif
|
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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 nxp_nci_i2c_phy *phy;
|
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struct nxp_nci_nfc_platform_data *pdata;
|
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int r;
|
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|
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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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r = -ENODEV;
|
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goto probe_exit;
|
||||
}
|
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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);
|
||||
if (!phy) {
|
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r = -ENOMEM;
|
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goto probe_exit;
|
||||
}
|
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|
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phy->i2c_dev = client;
|
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i2c_set_clientdata(client, phy);
|
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|
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pdata = client->dev.platform_data;
|
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|
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if (!pdata && client->dev.of_node) {
|
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r = nxp_nci_i2c_parse_devtree(client);
|
||||
if (r < 0) {
|
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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;
|
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client->irq = pdata->irq;
|
||||
} 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;
|
||||
|
||||
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 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);
|
||||
|
||||
static struct i2c_driver nxp_nci_i2c_driver = {
|
||||
.driver = {
|
||||
.name = NXP_NCI_I2C_DRIVER_NAME,
|
||||
.owner = THIS_MODULE,
|
||||
.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>");
|
||||
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