389 lines
9.0 KiB
C
389 lines
9.0 KiB
C
/* -------------------------------------------------------------------------
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* Copyright (C) 2014-2016, Intel Corporation
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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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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*/
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#include <linux/module.h>
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#include <linux/acpi.h>
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#include <linux/i2c.h>
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#include <linux/interrupt.h>
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#include <linux/nfc.h>
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#include <linux/delay.h>
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#include <linux/gpio/consumer.h>
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#include <net/nfc/nfc.h>
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#include <net/nfc/nci_core.h>
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#include "fdp.h"
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#define FDP_I2C_DRIVER_NAME "fdp_nci_i2c"
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#define FDP_DP_POWER_GPIO_NAME "power"
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#define FDP_DP_CLOCK_TYPE_NAME "clock-type"
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#define FDP_DP_CLOCK_FREQ_NAME "clock-freq"
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#define FDP_DP_FW_VSC_CFG_NAME "fw-vsc-cfg"
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#define FDP_FRAME_HEADROOM 2
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#define FDP_FRAME_TAILROOM 1
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#define FDP_NCI_I2C_MIN_PAYLOAD 5
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#define FDP_NCI_I2C_MAX_PAYLOAD 261
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#define FDP_POWER_OFF 0
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#define FDP_POWER_ON 1
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#define fdp_nci_i2c_dump_skb(dev, prefix, skb) \
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print_hex_dump(KERN_DEBUG, prefix": ", DUMP_PREFIX_OFFSET, \
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16, 1, (skb)->data, (skb)->len, 0)
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static void fdp_nci_i2c_reset(struct fdp_i2c_phy *phy)
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{
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/* Reset RST/WakeUP for at least 100 micro-second */
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gpiod_set_value_cansleep(phy->power_gpio, FDP_POWER_OFF);
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usleep_range(1000, 4000);
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gpiod_set_value_cansleep(phy->power_gpio, FDP_POWER_ON);
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usleep_range(10000, 14000);
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}
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static int fdp_nci_i2c_enable(void *phy_id)
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{
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struct fdp_i2c_phy *phy = phy_id;
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dev_dbg(&phy->i2c_dev->dev, "%s\n", __func__);
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fdp_nci_i2c_reset(phy);
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return 0;
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}
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static void fdp_nci_i2c_disable(void *phy_id)
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{
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struct fdp_i2c_phy *phy = phy_id;
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dev_dbg(&phy->i2c_dev->dev, "%s\n", __func__);
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fdp_nci_i2c_reset(phy);
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}
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static void fdp_nci_i2c_add_len_lrc(struct sk_buff *skb)
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{
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u8 lrc = 0;
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u16 len, i;
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/* Add length header */
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len = skb->len;
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*skb_push(skb, 1) = len & 0xff;
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*skb_push(skb, 1) = len >> 8;
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/* Compute and add lrc */
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for (i = 0; i < len + 2; i++)
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lrc ^= skb->data[i];
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*skb_put(skb, 1) = lrc;
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}
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static void fdp_nci_i2c_remove_len_lrc(struct sk_buff *skb)
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{
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skb_pull(skb, FDP_FRAME_HEADROOM);
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skb_trim(skb, skb->len - FDP_FRAME_TAILROOM);
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}
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static int fdp_nci_i2c_write(void *phy_id, struct sk_buff *skb)
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{
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struct fdp_i2c_phy *phy = phy_id;
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struct i2c_client *client = phy->i2c_dev;
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int r;
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if (phy->hard_fault != 0)
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return phy->hard_fault;
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fdp_nci_i2c_add_len_lrc(skb);
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fdp_nci_i2c_dump_skb(&client->dev, "fdp_wr", skb);
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r = i2c_master_send(client, skb->data, skb->len);
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if (r == -EREMOTEIO) { /* Retry, chip was in standby */
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usleep_range(1000, 4000);
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r = i2c_master_send(client, skb->data, skb->len);
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}
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if (r < 0 || r != skb->len)
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dev_dbg(&client->dev, "%s: error err=%d len=%d\n",
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__func__, r, skb->len);
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if (r >= 0) {
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if (r != skb->len) {
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phy->hard_fault = r;
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r = -EREMOTEIO;
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} else {
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r = 0;
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}
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}
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fdp_nci_i2c_remove_len_lrc(skb);
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return r;
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}
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static struct nfc_phy_ops i2c_phy_ops = {
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.write = fdp_nci_i2c_write,
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.enable = fdp_nci_i2c_enable,
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.disable = fdp_nci_i2c_disable,
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};
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static int fdp_nci_i2c_read(struct fdp_i2c_phy *phy, struct sk_buff **skb)
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{
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int r, len;
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u8 tmp[FDP_NCI_I2C_MAX_PAYLOAD], lrc, k;
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u16 i;
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struct i2c_client *client = phy->i2c_dev;
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*skb = NULL;
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/* Read the length packet and the data packet */
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for (k = 0; k < 2; k++) {
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len = phy->next_read_size;
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r = i2c_master_recv(client, tmp, len);
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if (r != len) {
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dev_dbg(&client->dev, "%s: i2c recv err: %d\n",
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__func__, r);
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goto flush;
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}
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/* Check packet integruty */
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for (lrc = i = 0; i < r; i++)
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lrc ^= tmp[i];
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/*
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* LRC check failed. This may due to transmission error or
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* desynchronization between driver and FDP. Drop the paquet
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* and force resynchronization
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*/
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if (lrc) {
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dev_dbg(&client->dev, "%s: corrupted packet\n",
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__func__);
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phy->next_read_size = 5;
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goto flush;
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}
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/* Packet that contains a length */
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if (tmp[0] == 0 && tmp[1] == 0) {
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phy->next_read_size = (tmp[2] << 8) + tmp[3] + 3;
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} else {
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phy->next_read_size = FDP_NCI_I2C_MIN_PAYLOAD;
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*skb = alloc_skb(len, GFP_KERNEL);
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if (*skb == NULL) {
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r = -ENOMEM;
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goto flush;
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}
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memcpy(skb_put(*skb, len), tmp, len);
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fdp_nci_i2c_dump_skb(&client->dev, "fdp_rd", *skb);
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fdp_nci_i2c_remove_len_lrc(*skb);
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}
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}
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return 0;
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flush:
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/* Flush the remaining data */
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if (i2c_master_recv(client, tmp, sizeof(tmp)) < 0)
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r = -EREMOTEIO;
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return r;
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}
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static irqreturn_t fdp_nci_i2c_irq_thread_fn(int irq, void *phy_id)
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{
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struct fdp_i2c_phy *phy = phy_id;
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struct i2c_client *client;
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struct sk_buff *skb;
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int r;
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if (!phy || irq != phy->i2c_dev->irq) {
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WARN_ON_ONCE(1);
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return IRQ_NONE;
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}
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client = phy->i2c_dev;
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dev_dbg(&client->dev, "%s\n", __func__);
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r = fdp_nci_i2c_read(phy, &skb);
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if (r == -EREMOTEIO)
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return IRQ_HANDLED;
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else if (r == -ENOMEM || r == -EBADMSG)
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return IRQ_HANDLED;
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if (skb != NULL)
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fdp_nci_recv_frame(phy->ndev, skb);
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return IRQ_HANDLED;
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}
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static void fdp_nci_i2c_read_device_properties(struct device *dev,
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u8 *clock_type, u32 *clock_freq,
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u8 **fw_vsc_cfg)
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{
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int r;
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u8 len;
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r = device_property_read_u8(dev, FDP_DP_CLOCK_TYPE_NAME, clock_type);
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if (r) {
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dev_dbg(dev, "Using default clock type");
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*clock_type = 0;
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}
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r = device_property_read_u32(dev, FDP_DP_CLOCK_FREQ_NAME, clock_freq);
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if (r) {
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dev_dbg(dev, "Using default clock frequency\n");
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*clock_freq = 26000;
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}
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if (device_property_present(dev, FDP_DP_FW_VSC_CFG_NAME)) {
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r = device_property_read_u8(dev, FDP_DP_FW_VSC_CFG_NAME,
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&len);
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if (r || len <= 0)
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goto vsc_read_err;
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/* Add 1 to the length to inclue the length byte itself */
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len++;
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*fw_vsc_cfg = devm_kmalloc(dev,
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len * sizeof(**fw_vsc_cfg),
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GFP_KERNEL);
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r = device_property_read_u8_array(dev, FDP_DP_FW_VSC_CFG_NAME,
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*fw_vsc_cfg, len);
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if (r) {
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devm_kfree(dev, fw_vsc_cfg);
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goto vsc_read_err;
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}
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} else {
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vsc_read_err:
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dev_dbg(dev, "FW vendor specific commands not present\n");
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*fw_vsc_cfg = NULL;
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}
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dev_dbg(dev, "Clock type: %d, clock frequency: %d, VSC: %s",
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*clock_type, *clock_freq, *fw_vsc_cfg != NULL ? "yes" : "no");
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}
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static int fdp_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 fdp_i2c_phy *phy;
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struct device *dev = &client->dev;
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u8 *fw_vsc_cfg;
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u8 clock_type;
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u32 clock_freq;
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int r = 0;
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dev_dbg(dev, "%s\n", __func__);
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if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C)) {
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nfc_err(dev, "No I2C_FUNC_I2C support\n");
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return -ENODEV;
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}
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/* Checking if we have an irq */
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if (client->irq <= 0) {
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nfc_err(dev, "IRQ not present\n");
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return -ENODEV;
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}
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phy = devm_kzalloc(dev, sizeof(struct fdp_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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phy->next_read_size = FDP_NCI_I2C_MIN_PAYLOAD;
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i2c_set_clientdata(client, phy);
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r = request_threaded_irq(client->irq, NULL, fdp_nci_i2c_irq_thread_fn,
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IRQF_TRIGGER_RISING | IRQF_ONESHOT,
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FDP_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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/* Requesting the power gpio */
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phy->power_gpio = devm_gpiod_get(dev, FDP_DP_POWER_GPIO_NAME,
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GPIOD_OUT_LOW);
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if (IS_ERR(phy->power_gpio)) {
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nfc_err(dev, "Power GPIO request failed\n");
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return PTR_ERR(phy->power_gpio);
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}
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/* read device properties to get the clock and production settings */
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fdp_nci_i2c_read_device_properties(dev, &clock_type, &clock_freq,
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&fw_vsc_cfg);
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/* Call the NFC specific probe function */
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r = fdp_nci_probe(phy, &i2c_phy_ops, &phy->ndev,
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FDP_FRAME_HEADROOM, FDP_FRAME_TAILROOM,
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clock_type, clock_freq, fw_vsc_cfg);
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if (r < 0) {
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nfc_err(dev, "NCI probing error\n");
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return r;
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}
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dev_dbg(dev, "I2C driver loaded\n");
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return 0;
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}
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static int fdp_nci_i2c_remove(struct i2c_client *client)
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{
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struct fdp_i2c_phy *phy = i2c_get_clientdata(client);
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dev_dbg(&client->dev, "%s\n", __func__);
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fdp_nci_remove(phy->ndev);
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fdp_nci_i2c_disable(phy);
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return 0;
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}
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static struct i2c_device_id fdp_nci_i2c_id_table[] = {
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{"int339a", 0},
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{}
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};
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MODULE_DEVICE_TABLE(i2c, fdp_nci_i2c_id_table);
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static const struct acpi_device_id fdp_nci_i2c_acpi_match[] = {
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{"INT339A", 0},
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{}
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};
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MODULE_DEVICE_TABLE(acpi, fdp_nci_i2c_acpi_match);
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static struct i2c_driver fdp_nci_i2c_driver = {
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.driver = {
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.name = FDP_I2C_DRIVER_NAME,
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.acpi_match_table = ACPI_PTR(fdp_nci_i2c_acpi_match),
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},
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.id_table = fdp_nci_i2c_id_table,
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.probe = fdp_nci_i2c_probe,
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.remove = fdp_nci_i2c_remove,
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};
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module_i2c_driver(fdp_nci_i2c_driver);
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MODULE_LICENSE("GPL");
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MODULE_DESCRIPTION("I2C driver for Intel Fields Peak NFC controller");
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MODULE_AUTHOR("Robert Dolca <robert.dolca@intel.com>");
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