Orange Pi5 kernel

^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)  * HCI based Driver for Inside Secure microread NFC Chip - i2c layer
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   4)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   5)  * Copyright (C) 2013 Intel Corporation. All rights reserved.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   6)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   7) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   8) #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   9) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  10) #include <linux/module.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  11) #include <linux/i2c.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  12) #include <linux/delay.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  13) #include <linux/slab.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  14) #include <linux/interrupt.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  15) #include <linux/gpio.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  16) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  17) #include <linux/nfc.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  18) #include <net/nfc/hci.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  19) #include <net/nfc/llc.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  20) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  21) #include "microread.h"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  22) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  23) #define MICROREAD_I2C_DRIVER_NAME "microread"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  24) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  25) #define MICROREAD_I2C_FRAME_HEADROOM 1
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  26) #define MICROREAD_I2C_FRAME_TAILROOM 1
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  27) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  28) /* framing in HCI mode */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  29) #define MICROREAD_I2C_LLC_LEN		1
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  30) #define MICROREAD_I2C_LLC_CRC		1
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  31) #define MICROREAD_I2C_LLC_LEN_CRC	(MICROREAD_I2C_LLC_LEN + \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  32) 					MICROREAD_I2C_LLC_CRC)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  33) #define MICROREAD_I2C_LLC_MIN_SIZE	(1 + MICROREAD_I2C_LLC_LEN_CRC)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  34) #define MICROREAD_I2C_LLC_MAX_PAYLOAD	29
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  35) #define MICROREAD_I2C_LLC_MAX_SIZE	(MICROREAD_I2C_LLC_LEN_CRC + 1 + \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  36) 					MICROREAD_I2C_LLC_MAX_PAYLOAD)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  37) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  38) struct microread_i2c_phy {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  39) 	struct i2c_client *i2c_dev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  40) 	struct nfc_hci_dev *hdev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  41) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  42) 	int hard_fault;		/*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  43) 				 * < 0 if hardware error occured (e.g. i2c err)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  44) 				 * and prevents normal operation.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  45) 				 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  46) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  47) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  48) #define I2C_DUMP_SKB(info, skb)					\
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  49) do {								\
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  50) 	pr_debug("%s:\n", info);				\
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  51) 	print_hex_dump(KERN_DEBUG, "i2c: ", DUMP_PREFIX_OFFSET,	\
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  52) 		       16, 1, (skb)->data, (skb)->len, 0);	\
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  53) } while (0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  54) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  55) static void microread_i2c_add_len_crc(struct sk_buff *skb)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  56) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  57) 	int i;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  58) 	u8 crc = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  59) 	int len;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  60) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  61) 	len = skb->len;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  62) 	*(u8 *)skb_push(skb, 1) = len;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  63) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  64) 	for (i = 0; i < skb->len; i++)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  65) 		crc = crc ^ skb->data[i];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  66) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  67) 	skb_put_u8(skb, crc);
^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) static void microread_i2c_remove_len_crc(struct sk_buff *skb)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  71) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  72) 	skb_pull(skb, MICROREAD_I2C_FRAME_HEADROOM);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  73) 	skb_trim(skb, MICROREAD_I2C_FRAME_TAILROOM);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  74) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  75) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  76) static int check_crc(struct sk_buff *skb)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  77) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  78) 	int i;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  79) 	u8 crc = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  80) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  81) 	for (i = 0; i < skb->len - 1; i++)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  82) 		crc = crc ^ skb->data[i];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  83) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  84) 	if (crc != skb->data[skb->len-1]) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  85) 		pr_err("CRC error 0x%x != 0x%x\n", crc, skb->data[skb->len-1]);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  86) 		pr_info("%s: BAD CRC\n", __func__);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  87) 		return -EPERM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  88) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  89) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  90) 	return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  91) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  92) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  93) static int microread_i2c_enable(void *phy_id)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  94) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  95) 	return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  96) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  97) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  98) static void microread_i2c_disable(void *phy_id)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  99) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 100) 	return;
^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) static int microread_i2c_write(void *phy_id, struct sk_buff *skb)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 104) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 105) 	int r;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 106) 	struct microread_i2c_phy *phy = phy_id;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 107) 	struct i2c_client *client = phy->i2c_dev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 108) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 109) 	if (phy->hard_fault != 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 110) 		return phy->hard_fault;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 111) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 112) 	usleep_range(3000, 6000);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 113) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 114) 	microread_i2c_add_len_crc(skb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 115) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 116) 	I2C_DUMP_SKB("i2c frame written", skb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 117) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 118) 	r = i2c_master_send(client, skb->data, skb->len);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 119) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 120) 	if (r == -EREMOTEIO) {	/* Retry, chip was in standby */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 121) 		usleep_range(6000, 10000);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 122) 		r = i2c_master_send(client, skb->data, skb->len);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 123) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 124) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 125) 	if (r >= 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 126) 		if (r != skb->len)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 127) 			r = -EREMOTEIO;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 128) 		else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 129) 			r = 0;
^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) 	microread_i2c_remove_len_crc(skb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 133) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 134) 	return r;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 135) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 136) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 137) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 138) static int microread_i2c_read(struct microread_i2c_phy *phy,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 139) 			      struct sk_buff **skb)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 140) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 141) 	int r;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 142) 	u8 len;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 143) 	u8 tmp[MICROREAD_I2C_LLC_MAX_SIZE - 1];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 144) 	struct i2c_client *client = phy->i2c_dev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 145) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 146) 	r = i2c_master_recv(client, &len, 1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 147) 	if (r != 1) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 148) 		nfc_err(&client->dev, "cannot read len byte\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 149) 		return -EREMOTEIO;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 150) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 151) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 152) 	if ((len < MICROREAD_I2C_LLC_MIN_SIZE) ||
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 153) 	    (len > MICROREAD_I2C_LLC_MAX_SIZE)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 154) 		nfc_err(&client->dev, "invalid len byte\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 155) 		r = -EBADMSG;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 156) 		goto flush;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 157) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 158) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 159) 	*skb = alloc_skb(1 + len, GFP_KERNEL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 160) 	if (*skb == NULL) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 161) 		r = -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 162) 		goto flush;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 163) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 164) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 165) 	skb_put_u8(*skb, len);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 166) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 167) 	r = i2c_master_recv(client, skb_put(*skb, len), len);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 168) 	if (r != len) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 169) 		kfree_skb(*skb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 170) 		return -EREMOTEIO;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 171) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 172) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 173) 	I2C_DUMP_SKB("cc frame read", *skb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 174) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 175) 	r = check_crc(*skb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 176) 	if (r != 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 177) 		kfree_skb(*skb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 178) 		r = -EBADMSG;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 179) 		goto flush;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 180) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 181) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 182) 	skb_pull(*skb, 1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 183) 	skb_trim(*skb, (*skb)->len - MICROREAD_I2C_FRAME_TAILROOM);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 184) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 185) 	usleep_range(3000, 6000);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 186) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 187) 	return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 188) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 189) flush:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 190) 	if (i2c_master_recv(client, tmp, sizeof(tmp)) < 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 191) 		r = -EREMOTEIO;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 192) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 193) 	usleep_range(3000, 6000);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 194) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 195) 	return r;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 196) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 197) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 198) static irqreturn_t microread_i2c_irq_thread_fn(int irq, void *phy_id)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 199) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 200) 	struct microread_i2c_phy *phy = phy_id;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 201) 	struct sk_buff *skb = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 202) 	int r;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 203) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 204) 	if (!phy || irq != phy->i2c_dev->irq) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 205) 		WARN_ON_ONCE(1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 206) 		return IRQ_NONE;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 207) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 208) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 209) 	if (phy->hard_fault != 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 210) 		return IRQ_HANDLED;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 211) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 212) 	r = microread_i2c_read(phy, &skb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 213) 	if (r == -EREMOTEIO) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 214) 		phy->hard_fault = r;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 215) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 216) 		nfc_hci_recv_frame(phy->hdev, NULL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 217) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 218) 		return IRQ_HANDLED;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 219) 	} else if ((r == -ENOMEM) || (r == -EBADMSG)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 220) 		return IRQ_HANDLED;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 221) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 222) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 223) 	nfc_hci_recv_frame(phy->hdev, skb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 224) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 225) 	return IRQ_HANDLED;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 226) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 227) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 228) static struct nfc_phy_ops i2c_phy_ops = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 229) 	.write = microread_i2c_write,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 230) 	.enable = microread_i2c_enable,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 231) 	.disable = microread_i2c_disable,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 232) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 233) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 234) static int microread_i2c_probe(struct i2c_client *client,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 235) 			       const struct i2c_device_id *id)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 236) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 237) 	struct microread_i2c_phy *phy;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 238) 	int r;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 239) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 240) 	dev_dbg(&client->dev, "client %p\n", client);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 241) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 242) 	phy = devm_kzalloc(&client->dev, sizeof(struct microread_i2c_phy),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 243) 			   GFP_KERNEL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 244) 	if (!phy)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 245) 		return -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 246) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 247) 	i2c_set_clientdata(client, phy);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 248) 	phy->i2c_dev = client;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 249) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 250) 	r = request_threaded_irq(client->irq, NULL, microread_i2c_irq_thread_fn,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 251) 				 IRQF_TRIGGER_RISING | IRQF_ONESHOT,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 252) 				 MICROREAD_I2C_DRIVER_NAME, phy);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 253) 	if (r) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 254) 		nfc_err(&client->dev, "Unable to register IRQ handler\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 255) 		return r;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 256) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 257) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 258) 	r = microread_probe(phy, &i2c_phy_ops, LLC_SHDLC_NAME,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 259) 			    MICROREAD_I2C_FRAME_HEADROOM,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 260) 			    MICROREAD_I2C_FRAME_TAILROOM,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 261) 			    MICROREAD_I2C_LLC_MAX_PAYLOAD, &phy->hdev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 262) 	if (r < 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 263) 		goto err_irq;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 264) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 265) 	nfc_info(&client->dev, "Probed\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 266) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 267) 	return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 268) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 269) err_irq:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 270) 	free_irq(client->irq, phy);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 271) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 272) 	return r;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 273) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 274) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 275) static int microread_i2c_remove(struct i2c_client *client)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 276) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 277) 	struct microread_i2c_phy *phy = i2c_get_clientdata(client);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 278) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 279) 	microread_remove(phy->hdev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 280) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 281) 	free_irq(client->irq, phy);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 282) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 283) 	return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 284) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 285) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 286) static const struct i2c_device_id microread_i2c_id[] = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 287) 	{ MICROREAD_I2C_DRIVER_NAME, 0},
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 288) 	{ }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 289) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 290) MODULE_DEVICE_TABLE(i2c, microread_i2c_id);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 291) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 292) static struct i2c_driver microread_i2c_driver = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 293) 	.driver = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 294) 		.name = MICROREAD_I2C_DRIVER_NAME,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 295) 	},
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 296) 	.probe		= microread_i2c_probe,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 297) 	.remove		= microread_i2c_remove,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 298) 	.id_table	= microread_i2c_id,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 299) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 300) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 301) module_i2c_driver(microread_i2c_driver);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 302) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 303) MODULE_LICENSE("GPL");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 304) MODULE_DESCRIPTION(DRIVER_DESC);