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// SPDX-License-Identifier: GPL-2.0+
/*
* (C) Copyright 2021
* Köry Maincent, Bootlin, <kory.maincent@bootlin.com>
* Based on initial code from Maxime Ripard
*/
#include <malloc.h>
#include <dm.h>
#include <w1.h>
#include <w1-eeprom.h>
#include <dm/device-internal.h>
#include <sunxi_gpio.h>
#include <extension_board.h>
#define for_each_w1_device(b, d) \
for (device_find_first_child(b, d); *d; device_find_next_child(d))
#define dip_convert(field) \
( \
(sizeof(field) == 1) ? field : \
(sizeof(field) == 2) ? be16_to_cpu(field) : \
(sizeof(field) == 4) ? be32_to_cpu(field) : \
-1 \
)
#define DIP_MAGIC 0x50494843 /* CHIP */
struct dip_w1_header {
u32 magic; /* CHIP */
u8 version; /* spec version */
u32 vendor_id;
u16 product_id;
u8 product_version;
char vendor_name[32];
char product_name[32];
u8 rsvd[36]; /* rsvd for future spec versions */
u8 data[16]; /* user data, per-dip specific */
} __packed;
int extension_board_scan(struct list_head *extension_list)
{
struct extension *dip;
struct dip_w1_header w1_header;
struct udevice *bus, *dev;
u32 vid;
u16 pid;
int ret;
int num_dip = 0;
sunxi_gpio_set_pull(SUNXI_GPD(2), SUNXI_GPIO_PULL_UP);
ret = w1_get_bus(0, &bus);
if (ret) {
printf("one wire interface not found\n");
return 0;
}
for_each_w1_device(bus, &dev) {
if (w1_get_device_family(dev) != W1_FAMILY_DS2431)
continue;
ret = device_probe(dev);
if (ret) {
printf("Couldn't probe device %s: error %d",
dev->name, ret);
continue;
}
w1_eeprom_read_buf(dev, 0, (u8 *)&w1_header, sizeof(w1_header));
if (w1_header.magic != DIP_MAGIC)
continue;
vid = dip_convert(w1_header.vendor_id);
pid = dip_convert(w1_header.product_id);
printf("DIP: %s (0x%x) from %s (0x%x)\n",
w1_header.product_name, pid,
w1_header.vendor_name, vid);
dip = calloc(1, sizeof(struct extension));
if (!dip) {
printf("Error in memory allocation\n");
return num_dip;
}
snprintf(dip->overlay, sizeof(dip->overlay), "dip-%x-%x.dtbo",
vid, pid);
strncpy(dip->name, w1_header.product_name, 32);
strncpy(dip->owner, w1_header.vendor_name, 32);
list_add_tail(&dip->list, extension_list);
num_dip++;
}
return num_dip;
}
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