| Kory Maincent | 6c2c7e9 | 2021-05-04 19:31:27 +0200 | [diff] [blame] | 1 | // SPDX-License-Identifier: GPL-2.0+ |
| 2 | /* |
| 3 | * (C) Copyright 2021 |
| 4 | * Köry Maincent, Bootlin, <kory.maincent@bootlin.com> |
| 5 | * Based on initial code from Maxime Ripard |
| 6 | */ |
| 7 | |
| 8 | #include <common.h> |
| 9 | #include <malloc.h> |
| 10 | #include <dm.h> |
| 11 | #include <w1.h> |
| 12 | #include <w1-eeprom.h> |
| 13 | #include <dm/device-internal.h> |
| 14 | |
| 15 | #include <asm/arch/gpio.h> |
| 16 | |
| 17 | #include <extension_board.h> |
| 18 | |
| 19 | #define for_each_w1_device(b, d) \ |
| 20 | for (device_find_first_child(b, d); *d; device_find_next_child(d)) |
| 21 | |
| 22 | #define dip_convert(field) \ |
| 23 | ( \ |
| 24 | (sizeof(field) == 1) ? field : \ |
| 25 | (sizeof(field) == 2) ? be16_to_cpu(field) : \ |
| 26 | (sizeof(field) == 4) ? be32_to_cpu(field) : \ |
| 27 | -1 \ |
| 28 | ) |
| 29 | |
| 30 | #define DIP_MAGIC 0x50494843 /* CHIP */ |
| 31 | |
| 32 | struct dip_w1_header { |
| 33 | u32 magic; /* CHIP */ |
| 34 | u8 version; /* spec version */ |
| 35 | u32 vendor_id; |
| 36 | u16 product_id; |
| 37 | u8 product_version; |
| 38 | char vendor_name[32]; |
| 39 | char product_name[32]; |
| 40 | u8 rsvd[36]; /* rsvd for future spec versions */ |
| 41 | u8 data[16]; /* user data, per-dip specific */ |
| 42 | } __packed; |
| 43 | |
| 44 | int extension_board_scan(struct list_head *extension_list) |
| 45 | { |
| 46 | struct extension *dip; |
| 47 | struct dip_w1_header w1_header; |
| 48 | struct udevice *bus, *dev; |
| 49 | u32 vid; |
| 50 | u16 pid; |
| 51 | int ret; |
| 52 | |
| 53 | int num_dip = 0; |
| 54 | |
| 55 | sunxi_gpio_set_pull(SUNXI_GPD(2), SUNXI_GPIO_PULL_UP); |
| 56 | |
| 57 | ret = w1_get_bus(0, &bus); |
| 58 | if (ret) { |
| 59 | printf("one wire interface not found\n"); |
| 60 | return 0; |
| 61 | } |
| 62 | |
| 63 | for_each_w1_device(bus, &dev) { |
| 64 | if (w1_get_device_family(dev) != W1_FAMILY_DS2431) |
| 65 | continue; |
| 66 | |
| 67 | ret = device_probe(dev); |
| 68 | if (ret) { |
| 69 | printf("Couldn't probe device %s: error %d", |
| 70 | dev->name, ret); |
| 71 | continue; |
| 72 | } |
| 73 | |
| 74 | w1_eeprom_read_buf(dev, 0, (u8 *)&w1_header, sizeof(w1_header)); |
| 75 | |
| 76 | if (w1_header.magic != DIP_MAGIC) |
| 77 | continue; |
| 78 | |
| 79 | vid = dip_convert(w1_header.vendor_id); |
| 80 | pid = dip_convert(w1_header.product_id); |
| 81 | |
| 82 | printf("DIP: %s (0x%x) from %s (0x%x)\n", |
| 83 | w1_header.product_name, pid, |
| 84 | w1_header.vendor_name, vid); |
| 85 | |
| 86 | dip = calloc(1, sizeof(struct extension)); |
| 87 | if (!dip) { |
| 88 | printf("Error in memory allocation\n"); |
| 89 | return num_dip; |
| 90 | } |
| 91 | |
| 92 | snprintf(dip->overlay, sizeof(dip->overlay), "dip-%x-%x.dtbo", |
| 93 | vid, pid); |
| 94 | strncpy(dip->name, w1_header.product_name, 32); |
| 95 | strncpy(dip->owner, w1_header.vendor_name, 32); |
| 96 | list_add_tail(&dip->list, extension_list); |
| 97 | num_dip++; |
| 98 | } |
| 99 | return num_dip; |
| 100 | } |