]>
Commit | Line | Data |
---|---|---|
6c2c7e9c KM |
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 | ||
d678a59d | 8 | #include <common.h> |
6c2c7e9c KM |
9 | #include <malloc.h> |
10 | #include <dm.h> | |
11 | #include <w1.h> | |
12 | #include <w1-eeprom.h> | |
13 | #include <dm/device-internal.h> | |
14 | ||
207ed0a3 | 15 | #include <sunxi_gpio.h> |
6c2c7e9c KM |
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 | } |