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