Orange Pi5 kernel

^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   1) // SPDX-License-Identifier: GPL-2.0-or-later
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   2) /* -------------------------------------------------------------------------
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   3)  * Copyright (C) 2014-2016, Intel Corporation
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   4)  *
^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) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   8) #include <linux/module.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   9) #include <linux/acpi.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  10) #include <linux/i2c.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  11) #include <linux/interrupt.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  12) #include <linux/nfc.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  13) #include <linux/delay.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  14) #include <linux/gpio/consumer.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  15) #include <net/nfc/nfc.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  16) #include <net/nfc/nci_core.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  17) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  18) #include "fdp.h"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  19) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  20) #define FDP_I2C_DRIVER_NAME	"fdp_nci_i2c"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  21) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  22) #define FDP_DP_CLOCK_TYPE_NAME	"clock-type"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  23) #define FDP_DP_CLOCK_FREQ_NAME	"clock-freq"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  24) #define FDP_DP_FW_VSC_CFG_NAME	"fw-vsc-cfg"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  25) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  26) #define FDP_FRAME_HEADROOM	2
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  27) #define FDP_FRAME_TAILROOM	1
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  28) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  29) #define FDP_NCI_I2C_MIN_PAYLOAD	5
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  30) #define FDP_NCI_I2C_MAX_PAYLOAD	261
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  31) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  32) #define FDP_POWER_OFF		0
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  33) #define FDP_POWER_ON		1
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  34) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  35) #define fdp_nci_i2c_dump_skb(dev, prefix, skb)				\
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  36) 	print_hex_dump(KERN_DEBUG, prefix": ", DUMP_PREFIX_OFFSET,	\
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  37) 		       16, 1, (skb)->data, (skb)->len, 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  38) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  39) static void fdp_nci_i2c_reset(struct fdp_i2c_phy *phy)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  40) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  41) 	/* Reset RST/WakeUP for at least 100 micro-second */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  42) 	gpiod_set_value_cansleep(phy->power_gpio, FDP_POWER_OFF);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  43) 	usleep_range(1000, 4000);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  44) 	gpiod_set_value_cansleep(phy->power_gpio, FDP_POWER_ON);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  45) 	usleep_range(10000, 14000);
^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) static int fdp_nci_i2c_enable(void *phy_id)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  49) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  50) 	struct fdp_i2c_phy *phy = phy_id;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  51) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  52) 	dev_dbg(&phy->i2c_dev->dev, "%s\n", __func__);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  53) 	fdp_nci_i2c_reset(phy);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  54) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  55) 	return 0;
^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) static void fdp_nci_i2c_disable(void *phy_id)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  59) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  60) 	struct fdp_i2c_phy *phy = phy_id;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  61) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  62) 	dev_dbg(&phy->i2c_dev->dev, "%s\n", __func__);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  63) 	fdp_nci_i2c_reset(phy);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  64) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  65) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  66) static void fdp_nci_i2c_add_len_lrc(struct sk_buff *skb)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  67) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  68) 	u8 lrc = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  69) 	u16 len, i;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  70) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  71) 	/* Add length header */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  72) 	len = skb->len;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  73) 	*(u8 *)skb_push(skb, 1) = len & 0xff;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  74) 	*(u8 *)skb_push(skb, 1) = len >> 8;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  75) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  76) 	/* Compute and add lrc */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  77) 	for (i = 0; i < len + 2; i++)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  78) 		lrc ^= skb->data[i];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  79) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  80) 	skb_put_u8(skb, lrc);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  81) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  82) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  83) static void fdp_nci_i2c_remove_len_lrc(struct sk_buff *skb)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  84) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  85) 	skb_pull(skb, FDP_FRAME_HEADROOM);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  86) 	skb_trim(skb, skb->len - FDP_FRAME_TAILROOM);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  87) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  88) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  89) static int fdp_nci_i2c_write(void *phy_id, struct sk_buff *skb)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  90) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  91) 	struct fdp_i2c_phy *phy = phy_id;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  92) 	struct i2c_client *client = phy->i2c_dev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  93) 	int r;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  94) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  95) 	if (phy->hard_fault != 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  96) 		return phy->hard_fault;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  97) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  98) 	fdp_nci_i2c_add_len_lrc(skb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  99) 	fdp_nci_i2c_dump_skb(&client->dev, "fdp_wr", skb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 100) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 101) 	r = i2c_master_send(client, skb->data, skb->len);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 102) 	if (r == -EREMOTEIO) {  /* Retry, chip was in standby */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 103) 		usleep_range(1000, 4000);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 104) 		r = i2c_master_send(client, skb->data, skb->len);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 105) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 106) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 107) 	if (r < 0 || r != skb->len)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 108) 		dev_dbg(&client->dev, "%s: error err=%d len=%d\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 109) 			__func__, r, skb->len);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 110) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 111) 	if (r >= 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 112) 		if (r != skb->len) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 113) 			phy->hard_fault = r;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 114) 			r = -EREMOTEIO;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 115) 		} else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 116) 			r = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 117) 		}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 118) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 119) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 120) 	fdp_nci_i2c_remove_len_lrc(skb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 121) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 122) 	return r;
^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) static struct nfc_phy_ops i2c_phy_ops = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 126) 	.write = fdp_nci_i2c_write,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 127) 	.enable = fdp_nci_i2c_enable,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 128) 	.disable = fdp_nci_i2c_disable,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 129) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 130) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 131) static int fdp_nci_i2c_read(struct fdp_i2c_phy *phy, struct sk_buff **skb)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 132) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 133) 	int r, len;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 134) 	u8 tmp[FDP_NCI_I2C_MAX_PAYLOAD], lrc, k;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 135) 	u16 i;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 136) 	struct i2c_client *client = phy->i2c_dev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 137) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 138) 	*skb = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 139) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 140) 	/* Read the length packet and the data packet */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 141) 	for (k = 0; k < 2; k++) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 142) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 143) 		len = phy->next_read_size;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 144) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 145) 		r = i2c_master_recv(client, tmp, len);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 146) 		if (r != len) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 147) 			dev_dbg(&client->dev, "%s: i2c recv err: %d\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 148) 				__func__, r);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 149) 			goto flush;
^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) 		/* Check packet integruty */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 153) 		for (lrc = i = 0; i < r; i++)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 154) 			lrc ^= tmp[i];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 155) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 156) 		/*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 157) 		 * LRC check failed. This may due to transmission error or
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 158) 		 * desynchronization between driver and FDP. Drop the paquet
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 159) 		 * and force resynchronization
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 160) 		 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 161) 		if (lrc) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 162) 			dev_dbg(&client->dev, "%s: corrupted packet\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 163) 				__func__);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 164) 			phy->next_read_size = 5;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 165) 			goto flush;
^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) 		/* Packet that contains a length */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 169) 		if (tmp[0] == 0 && tmp[1] == 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 170) 			phy->next_read_size = (tmp[2] << 8) + tmp[3] + 3;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 171) 		} else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 172) 			phy->next_read_size = FDP_NCI_I2C_MIN_PAYLOAD;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 173) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 174) 			*skb = alloc_skb(len, GFP_KERNEL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 175) 			if (*skb == NULL) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 176) 				r = -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 177) 				goto flush;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 178) 			}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 179) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 180) 			skb_put_data(*skb, tmp, len);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 181) 			fdp_nci_i2c_dump_skb(&client->dev, "fdp_rd", *skb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 182) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 183) 			fdp_nci_i2c_remove_len_lrc(*skb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 184) 		}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 185) 	}
^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) 	/* Flush the remaining data */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 191) 	if (i2c_master_recv(client, tmp, sizeof(tmp)) < 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 192) 		r = -EREMOTEIO;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 193) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 194) 	return r;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 195) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 196) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 197) static irqreturn_t fdp_nci_i2c_irq_thread_fn(int irq, void *phy_id)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 198) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 199) 	struct fdp_i2c_phy *phy = phy_id;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 200) 	struct i2c_client *client;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 201) 	struct sk_buff *skb;
^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) 	client = phy->i2c_dev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 210) 	dev_dbg(&client->dev, "%s\n", __func__);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 211) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 212) 	r = fdp_nci_i2c_read(phy, &skb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 213) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 214) 	if (r == -EREMOTEIO)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 215) 		return IRQ_HANDLED;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 216) 	else if (r == -ENOMEM || r == -EBADMSG)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 217) 		return IRQ_HANDLED;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 218) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 219) 	if (skb != NULL)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 220) 		fdp_nci_recv_frame(phy->ndev, skb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 221) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 222) 	return IRQ_HANDLED;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 223) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 224) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 225) static void fdp_nci_i2c_read_device_properties(struct device *dev,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 226) 					       u8 *clock_type, u32 *clock_freq,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 227) 					       u8 **fw_vsc_cfg)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 228) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 229) 	int r;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 230) 	u8 len;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 231) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 232) 	r = device_property_read_u8(dev, FDP_DP_CLOCK_TYPE_NAME, clock_type);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 233) 	if (r) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 234) 		dev_dbg(dev, "Using default clock type");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 235) 		*clock_type = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 236) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 237) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 238) 	r = device_property_read_u32(dev, FDP_DP_CLOCK_FREQ_NAME, clock_freq);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 239) 	if (r) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 240) 		dev_dbg(dev, "Using default clock frequency\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 241) 		*clock_freq = 26000;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 242) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 243) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 244) 	if (device_property_present(dev, FDP_DP_FW_VSC_CFG_NAME)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 245) 		r = device_property_read_u8(dev, FDP_DP_FW_VSC_CFG_NAME,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 246) 					    &len);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 247) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 248) 		if (r || len <= 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 249) 			goto vsc_read_err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 250) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 251) 		/* Add 1 to the length to inclue the length byte itself */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 252) 		len++;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 253) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 254) 		*fw_vsc_cfg = devm_kmalloc_array(dev,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 255) 					   len, sizeof(**fw_vsc_cfg),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 256) 					   GFP_KERNEL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 257) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 258) 		r = device_property_read_u8_array(dev, FDP_DP_FW_VSC_CFG_NAME,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 259) 						  *fw_vsc_cfg, len);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 260) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 261) 		if (r) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 262) 			devm_kfree(dev, *fw_vsc_cfg);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 263) 			goto vsc_read_err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 264) 		}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 265) 	} else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 266) vsc_read_err:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 267) 		dev_dbg(dev, "FW vendor specific commands not present\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 268) 		*fw_vsc_cfg = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 269) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 270) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 271) 	dev_dbg(dev, "Clock type: %d, clock frequency: %d, VSC: %s",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 272) 		*clock_type, *clock_freq, *fw_vsc_cfg != NULL ? "yes" : "no");
^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 const struct acpi_gpio_params power_gpios = { 0, 0, false };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 276) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 277) static const struct acpi_gpio_mapping acpi_fdp_gpios[] = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 278) 	{ "power-gpios", &power_gpios, 1 },
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 279) 	{},
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 280) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 281) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 282) static int fdp_nci_i2c_probe(struct i2c_client *client)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 283) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 284) 	struct fdp_i2c_phy *phy;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 285) 	struct device *dev = &client->dev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 286) 	u8 *fw_vsc_cfg;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 287) 	u8 clock_type;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 288) 	u32 clock_freq;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 289) 	int r = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 290) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 291) 	dev_dbg(dev, "%s\n", __func__);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 292) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 293) 	if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 294) 		nfc_err(dev, "No I2C_FUNC_I2C support\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 295) 		return -ENODEV;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 296) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 297) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 298) 	/* Checking if we have an irq */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 299) 	if (client->irq <= 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 300) 		nfc_err(dev, "IRQ not present\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 301) 		return -ENODEV;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 302) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 303) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 304) 	phy = devm_kzalloc(dev, sizeof(struct fdp_i2c_phy), GFP_KERNEL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 305) 	if (!phy)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 306) 		return -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 307) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 308) 	phy->i2c_dev = client;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 309) 	phy->next_read_size = FDP_NCI_I2C_MIN_PAYLOAD;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 310) 	i2c_set_clientdata(client, phy);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 311) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 312) 	r = devm_request_threaded_irq(dev, client->irq,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 313) 				      NULL, fdp_nci_i2c_irq_thread_fn,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 314) 				      IRQF_TRIGGER_RISING | IRQF_ONESHOT,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 315) 				      FDP_I2C_DRIVER_NAME, phy);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 316) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 317) 	if (r < 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 318) 		nfc_err(&client->dev, "Unable to register IRQ handler\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 319) 		return r;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 320) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 321) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 322) 	r = devm_acpi_dev_add_driver_gpios(dev, acpi_fdp_gpios);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 323) 	if (r)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 324) 		dev_dbg(dev, "Unable to add GPIO mapping table\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 325) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 326) 	/* Requesting the power gpio */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 327) 	phy->power_gpio = devm_gpiod_get(dev, "power", GPIOD_OUT_LOW);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 328) 	if (IS_ERR(phy->power_gpio)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 329) 		nfc_err(dev, "Power GPIO request failed\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 330) 		return PTR_ERR(phy->power_gpio);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 331) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 332) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 333) 	/* read device properties to get the clock and production settings */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 334) 	fdp_nci_i2c_read_device_properties(dev, &clock_type, &clock_freq,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 335) 					   &fw_vsc_cfg);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 336) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 337) 	/* Call the NFC specific probe function */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 338) 	r = fdp_nci_probe(phy, &i2c_phy_ops, &phy->ndev,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 339) 			  FDP_FRAME_HEADROOM, FDP_FRAME_TAILROOM,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 340) 			  clock_type, clock_freq, fw_vsc_cfg);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 341) 	if (r < 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 342) 		nfc_err(dev, "NCI probing error\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 343) 		return r;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 344) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 345) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 346) 	dev_dbg(dev, "I2C driver loaded\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 347) 	return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 348) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 349) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 350) static int fdp_nci_i2c_remove(struct i2c_client *client)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 351) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 352) 	struct fdp_i2c_phy *phy = i2c_get_clientdata(client);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 353) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 354) 	dev_dbg(&client->dev, "%s\n", __func__);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 355) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 356) 	fdp_nci_remove(phy->ndev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 357) 	fdp_nci_i2c_disable(phy);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 358) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 359) 	return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 360) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 361) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 362) static const struct acpi_device_id fdp_nci_i2c_acpi_match[] = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 363) 	{"INT339A", 0},
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 364) 	{}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 365) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 366) MODULE_DEVICE_TABLE(acpi, fdp_nci_i2c_acpi_match);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 367) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 368) static struct i2c_driver fdp_nci_i2c_driver = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 369) 	.driver = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 370) 		   .name = FDP_I2C_DRIVER_NAME,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 371) 		   .acpi_match_table = ACPI_PTR(fdp_nci_i2c_acpi_match),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 372) 		  },
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 373) 	.probe_new = fdp_nci_i2c_probe,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 374) 	.remove = fdp_nci_i2c_remove,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 375) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 376) module_i2c_driver(fdp_nci_i2c_driver);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 377) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 378) MODULE_LICENSE("GPL");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 379) MODULE_DESCRIPTION("I2C driver for Intel Fields Peak NFC controller");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 380) MODULE_AUTHOR("Robert Dolca <robert.dolca@intel.com>");