61 #define I2C_DUMP_SKB(info, skb)					\  argument
65 		       16, 1, (skb)->data, (skb)->len, 0);	\
68 static void microread_i2c_add_len_crc(struct sk_buff *skb)  in microread_i2c_add_len_crc()  argument
74 	len = skb->len;  in microread_i2c_add_len_crc()
75 	*skb_push(skb, 1) = len;  in microread_i2c_add_len_crc()
77 	for (i = 0; i < skb->len; i++)  in microread_i2c_add_len_crc()
78 		crc = crc ^ skb->data[i];  in microread_i2c_add_len_crc()
80 	*skb_put(skb, 1) = crc;  in microread_i2c_add_len_crc()
83 static void microread_i2c_remove_len_crc(struct sk_buff *skb)  in microread_i2c_remove_len_crc()  argument
85 	skb_pull(skb, MICROREAD_I2C_FRAME_HEADROOM);  in microread_i2c_remove_len_crc()
86 	skb_trim(skb, MICROREAD_I2C_FRAME_TAILROOM);  in microread_i2c_remove_len_crc()
89 static int check_crc(struct sk_buff *skb)  in check_crc()  argument
94 	for (i = 0; i < skb->len - 1; i++)  in check_crc()
95 		crc = crc ^ skb->data[i];  in check_crc()
97 	if (crc != skb->data[skb->len-1]) {  in check_crc()
98 		pr_err("CRC error 0x%x != 0x%x\n", crc, skb->data[skb->len-1]);  in check_crc()
116 static int microread_i2c_write(void *phy_id, struct sk_buff *skb)  in microread_i2c_write()  argument
127 	microread_i2c_add_len_crc(skb);  in microread_i2c_write()
129 	I2C_DUMP_SKB("i2c frame written", skb);  in microread_i2c_write()
131 	r = i2c_master_send(client, skb->data, skb->len);  in microread_i2c_write()
135 		r = i2c_master_send(client, skb->data, skb->len);  in microread_i2c_write()
139 		if (r != skb->len)  in microread_i2c_write()
145 	microread_i2c_remove_len_crc(skb);  in microread_i2c_write()
152 			      struct sk_buff **skb)  in microread_i2c_read()  argument
172 	*skb = alloc_skb(1 + len, GFP_KERNEL);  in microread_i2c_read()
173 	if (*skb == NULL) {  in microread_i2c_read()
178 	*skb_put(*skb, 1) = len;  in microread_i2c_read()
180 	r = i2c_master_recv(client, skb_put(*skb, len), len);  in microread_i2c_read()
182 		kfree_skb(*skb);  in microread_i2c_read()
186 	I2C_DUMP_SKB("cc frame read", *skb);  in microread_i2c_read()
188 	r = check_crc(*skb);  in microread_i2c_read()
190 		kfree_skb(*skb);  in microread_i2c_read()
195 	skb_pull(*skb, 1);  in microread_i2c_read()
196 	skb_trim(*skb, (*skb)->len - MICROREAD_I2C_FRAME_TAILROOM);  in microread_i2c_read()
215 	struct sk_buff *skb = NULL;  in microread_i2c_irq_thread_fn()  local
228 	r = microread_i2c_read(phy, &skb);  in microread_i2c_irq_thread_fn()
239 	nfc_hci_recv_frame(phy->hdev, skb);  in microread_i2c_irq_thread_fn()