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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 <common.h>
- #include <malloc.h>
- #include <dm.h>
- #include <w1.h>
- #include <w1-eeprom.h>
- #include <dm/device-internal.h>
- #include <asm/arch/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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