^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1) // SPDX-License-Identifier: GPL-2.0-only
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3) * SPI Link Layer for ST NCI based Driver
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4) * Copyright (C) 2014-2015 STMicroelectronics SAS. All rights reserved.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 5) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 6)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 7) #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 8)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 9) #include <linux/module.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 10) #include <linux/spi/spi.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 11) #include <linux/gpio/consumer.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 12) #include <linux/acpi.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 13) #include <linux/interrupt.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 14) #include <linux/delay.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 15) #include <linux/nfc.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 16) #include <linux/of.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 17) #include <net/nfc/nci.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 18)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 19) #include "st-nci.h"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 20)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 21) #define DRIVER_DESC "NCI NFC driver for ST_NCI"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 22)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 23) /* ndlc header */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 24) #define ST_NCI_FRAME_HEADROOM 1
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 25) #define ST_NCI_FRAME_TAILROOM 0
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 26)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 27) #define ST_NCI_SPI_MIN_SIZE 4 /* PCB(1) + NCI Packet header(3) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 28) #define ST_NCI_SPI_MAX_SIZE 250 /* req 4.2.1 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 29)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 30) #define ST_NCI_DRIVER_NAME "st_nci"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 31) #define ST_NCI_SPI_DRIVER_NAME "st_nci_spi"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 32)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 33) struct st_nci_spi_phy {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 34) struct spi_device *spi_dev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 35) struct llt_ndlc *ndlc;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 36)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 37) bool irq_active;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 38)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 39) struct gpio_desc *gpiod_reset;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 40)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 41) struct st_nci_se_status se_status;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 42) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 43)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 44) static int st_nci_spi_enable(void *phy_id)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 45) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 46) struct st_nci_spi_phy *phy = phy_id;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 47)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 48) gpiod_set_value(phy->gpiod_reset, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 49) usleep_range(10000, 15000);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 50) gpiod_set_value(phy->gpiod_reset, 1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 51) usleep_range(80000, 85000);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 52)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 53) if (phy->ndlc->powered == 0 && phy->irq_active == 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 54) enable_irq(phy->spi_dev->irq);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 55) phy->irq_active = true;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 56) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 57)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 58) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 59) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 60)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 61) static void st_nci_spi_disable(void *phy_id)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 62) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 63) struct st_nci_spi_phy *phy = phy_id;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 64)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 65) disable_irq_nosync(phy->spi_dev->irq);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 66) phy->irq_active = false;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 67) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 68)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 69) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 70) * Writing a frame must not return the number of written bytes.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 71) * It must return either zero for success, or <0 for error.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 72) * In addition, it must not alter the skb
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 73) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 74) static int st_nci_spi_write(void *phy_id, struct sk_buff *skb)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 75) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 76) int r;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 77) struct st_nci_spi_phy *phy = phy_id;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 78) struct spi_device *dev = phy->spi_dev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 79) struct sk_buff *skb_rx;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 80) u8 buf[ST_NCI_SPI_MAX_SIZE + NCI_DATA_HDR_SIZE +
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 81) ST_NCI_FRAME_HEADROOM + ST_NCI_FRAME_TAILROOM];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 82) struct spi_transfer spi_xfer = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 83) .tx_buf = skb->data,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 84) .rx_buf = buf,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 85) .len = skb->len,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 86) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 87)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 88) if (phy->ndlc->hard_fault != 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 89) return phy->ndlc->hard_fault;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 90)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 91) r = spi_sync_transfer(dev, &spi_xfer, 1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 92) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 93) * We may have received some valuable data on miso line.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 94) * Send them back in the ndlc state machine.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 95) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 96) if (!r) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 97) skb_rx = alloc_skb(skb->len, GFP_KERNEL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 98) if (!skb_rx) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 99) r = -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 100) goto exit;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 101) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 102)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 103) skb_put(skb_rx, skb->len);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 104) memcpy(skb_rx->data, buf, skb->len);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 105) ndlc_recv(phy->ndlc, skb_rx);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 106) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 107)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 108) exit:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 109) return r;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 110) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 111)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 112) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 113) * Reads an ndlc frame and returns it in a newly allocated sk_buff.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 114) * returns:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 115) * 0 : if received frame is complete
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 116) * -EREMOTEIO : i2c read error (fatal)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 117) * -EBADMSG : frame was incorrect and discarded
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 118) * -ENOMEM : cannot allocate skb, frame dropped
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 119) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 120) static int st_nci_spi_read(struct st_nci_spi_phy *phy,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 121) struct sk_buff **skb)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 122) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 123) int r;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 124) u8 len;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 125) u8 buf[ST_NCI_SPI_MAX_SIZE];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 126) struct spi_device *dev = phy->spi_dev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 127) struct spi_transfer spi_xfer = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 128) .rx_buf = buf,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 129) .len = ST_NCI_SPI_MIN_SIZE,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 130) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 131)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 132) r = spi_sync_transfer(dev, &spi_xfer, 1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 133) if (r < 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 134) return -EREMOTEIO;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 135)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 136) len = be16_to_cpu(*(__be16 *) (buf + 2));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 137) if (len > ST_NCI_SPI_MAX_SIZE) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 138) nfc_err(&dev->dev, "invalid frame len\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 139) phy->ndlc->hard_fault = 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 140) return -EBADMSG;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 141) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 142)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 143) *skb = alloc_skb(ST_NCI_SPI_MIN_SIZE + len, GFP_KERNEL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 144) if (*skb == NULL)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 145) return -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 146)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 147) skb_reserve(*skb, ST_NCI_SPI_MIN_SIZE);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 148) skb_put(*skb, ST_NCI_SPI_MIN_SIZE);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 149) memcpy((*skb)->data, buf, ST_NCI_SPI_MIN_SIZE);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 150)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 151) if (!len)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 152) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 153)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 154) spi_xfer.len = len;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 155) r = spi_sync_transfer(dev, &spi_xfer, 1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 156) if (r < 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 157) kfree_skb(*skb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 158) return -EREMOTEIO;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 159) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 160)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 161) skb_put(*skb, len);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 162) memcpy((*skb)->data + ST_NCI_SPI_MIN_SIZE, buf, len);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 163)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 164) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 165) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 166)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 167) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 168) * Reads an ndlc frame from the chip.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 169) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 170) * On ST21NFCB, IRQ goes in idle state when read starts.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 171) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 172) static irqreturn_t st_nci_irq_thread_fn(int irq, void *phy_id)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 173) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 174) struct st_nci_spi_phy *phy = phy_id;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 175) struct spi_device *dev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 176) struct sk_buff *skb = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 177) int r;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 178)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 179) if (!phy || !phy->ndlc || irq != phy->spi_dev->irq) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 180) WARN_ON_ONCE(1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 181) return IRQ_NONE;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 182) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 183)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 184) dev = phy->spi_dev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 185) dev_dbg(&dev->dev, "IRQ\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 186)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 187) if (phy->ndlc->hard_fault)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 188) return IRQ_HANDLED;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 189)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 190) if (!phy->ndlc->powered) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 191) st_nci_spi_disable(phy);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 192) return IRQ_HANDLED;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 193) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 194)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 195) r = st_nci_spi_read(phy, &skb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 196) if (r == -EREMOTEIO || r == -ENOMEM || r == -EBADMSG)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 197) return IRQ_HANDLED;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 198)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 199) ndlc_recv(phy->ndlc, skb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 200)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 201) return IRQ_HANDLED;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 202) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 203)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 204) static struct nfc_phy_ops spi_phy_ops = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 205) .write = st_nci_spi_write,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 206) .enable = st_nci_spi_enable,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 207) .disable = st_nci_spi_disable,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 208) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 209)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 210) static const struct acpi_gpio_params reset_gpios = { 1, 0, false };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 211)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 212) static const struct acpi_gpio_mapping acpi_st_nci_gpios[] = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 213) { "reset-gpios", &reset_gpios, 1 },
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 214) {},
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 215) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 216)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 217) static int st_nci_spi_probe(struct spi_device *dev)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 218) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 219) struct st_nci_spi_phy *phy;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 220) int r;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 221)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 222) dev_dbg(&dev->dev, "%s\n", __func__);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 223) dev_dbg(&dev->dev, "IRQ: %d\n", dev->irq);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 224)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 225) /* Check SPI platform functionnalities */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 226) if (!dev) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 227) pr_debug("%s: dev is NULL. Device is not accessible.\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 228) __func__);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 229) return -ENODEV;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 230) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 231)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 232) phy = devm_kzalloc(&dev->dev, sizeof(struct st_nci_spi_phy),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 233) GFP_KERNEL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 234) if (!phy)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 235) return -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 236)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 237) phy->spi_dev = dev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 238)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 239) spi_set_drvdata(dev, phy);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 240)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 241) r = devm_acpi_dev_add_driver_gpios(&dev->dev, acpi_st_nci_gpios);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 242) if (r)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 243) dev_dbg(&dev->dev, "Unable to add GPIO mapping table\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 244)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 245) /* Get RESET GPIO */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 246) phy->gpiod_reset = devm_gpiod_get(&dev->dev, "reset", GPIOD_OUT_HIGH);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 247) if (IS_ERR(phy->gpiod_reset)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 248) nfc_err(&dev->dev, "Unable to get RESET GPIO\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 249) return PTR_ERR(phy->gpiod_reset);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 250) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 251)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 252) phy->se_status.is_ese_present =
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 253) device_property_read_bool(&dev->dev, "ese-present");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 254) phy->se_status.is_uicc_present =
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 255) device_property_read_bool(&dev->dev, "uicc-present");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 256)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 257) r = ndlc_probe(phy, &spi_phy_ops, &dev->dev,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 258) ST_NCI_FRAME_HEADROOM, ST_NCI_FRAME_TAILROOM,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 259) &phy->ndlc, &phy->se_status);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 260) if (r < 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 261) nfc_err(&dev->dev, "Unable to register ndlc layer\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 262) return r;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 263) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 264)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 265) phy->irq_active = true;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 266) r = devm_request_threaded_irq(&dev->dev, dev->irq, NULL,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 267) st_nci_irq_thread_fn,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 268) IRQF_ONESHOT,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 269) ST_NCI_SPI_DRIVER_NAME, phy);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 270) if (r < 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 271) nfc_err(&dev->dev, "Unable to register IRQ handler\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 272)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 273) return r;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 274) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 275)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 276) static int st_nci_spi_remove(struct spi_device *dev)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 277) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 278) struct st_nci_spi_phy *phy = spi_get_drvdata(dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 279)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 280) dev_dbg(&dev->dev, "%s\n", __func__);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 281)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 282) ndlc_remove(phy->ndlc);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 283)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 284) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 285) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 286)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 287) static struct spi_device_id st_nci_spi_id_table[] = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 288) {ST_NCI_SPI_DRIVER_NAME, 0},
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 289) {}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 290) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 291) MODULE_DEVICE_TABLE(spi, st_nci_spi_id_table);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 292)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 293) static const struct acpi_device_id st_nci_spi_acpi_match[] = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 294) {"SMO2101", 0},
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 295) {}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 296) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 297) MODULE_DEVICE_TABLE(acpi, st_nci_spi_acpi_match);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 298)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 299) static const struct of_device_id of_st_nci_spi_match[] = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 300) { .compatible = "st,st21nfcb-spi", },
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 301) {}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 302) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 303) MODULE_DEVICE_TABLE(of, of_st_nci_spi_match);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 304)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 305) static struct spi_driver st_nci_spi_driver = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 306) .driver = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 307) .name = ST_NCI_SPI_DRIVER_NAME,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 308) .of_match_table = of_match_ptr(of_st_nci_spi_match),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 309) .acpi_match_table = ACPI_PTR(st_nci_spi_acpi_match),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 310) },
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 311) .probe = st_nci_spi_probe,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 312) .id_table = st_nci_spi_id_table,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 313) .remove = st_nci_spi_remove,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 314) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 315) module_spi_driver(st_nci_spi_driver);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 316)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 317) MODULE_LICENSE("GPL");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 318) MODULE_DESCRIPTION(DRIVER_DESC);
Orange Pi5 kernel
Deprecated Linux kernel 5.10.110 for OrangePi 5/5B/5+ boards
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