1 // SPDX-License-Identifier: GPL-2.0+
2 /*
3 *
4 * Copyright (c) 2015 Free Electrons
5 * Copyright (c) 2015 NextThing Co.
6 * Copyright (c) 2018 Microchip Technology, Inc.
7 *
8 * Maxime Ripard <maxime.ripard@free-electrons.com>
9 * Eugen Hristev <eugen.hristev@microchip.com>
10 *
11 */
12
13 #include <common.h>
14 #include <dm.h>
15 #include <w1.h>
16 #include <w1-eeprom.h>
17
18 #include <dm/device-internal.h>
19
w1_eeprom_read_buf(struct udevice * dev,unsigned int offset,u8 * buf,unsigned int count)20 int w1_eeprom_read_buf(struct udevice *dev, unsigned int offset,
21 u8 *buf, unsigned int count)
22 {
23 const struct w1_eeprom_ops *ops = device_get_ops(dev);
24 u64 id = 0;
25 int ret;
26
27 if (!ops->read_buf)
28 return -ENOSYS;
29
30 ret = w1_eeprom_get_id(dev, &id);
31 if (ret)
32 return ret;
33 if (!id)
34 return -ENODEV;
35
36 return ops->read_buf(dev, offset, buf, count);
37 }
38
w1_eeprom_register_new_device(u64 id)39 int w1_eeprom_register_new_device(u64 id)
40 {
41 u8 family = id & 0xff;
42 int ret;
43 struct udevice *dev;
44
45 for (ret = uclass_first_device(UCLASS_W1_EEPROM, &dev);
46 !ret && dev;
47 uclass_next_device(&dev)) {
48 if (ret || !dev) {
49 debug("cannot find w1 eeprom dev\n");
50 return ret;
51 }
52 if (dev_get_driver_data(dev) == family) {
53 struct w1_device *w1;
54
55 w1 = dev_get_parent_platdata(dev);
56 if (w1->id) /* device already in use */
57 continue;
58 w1->id = id;
59 debug("%s: Match found: %s:%s %llx\n", __func__,
60 dev->name, dev->driver->name, id);
61 return 0;
62 }
63 }
64
65 debug("%s: No matches found: error %d\n", __func__, ret);
66
67 return ret;
68 }
69
w1_eeprom_get_id(struct udevice * dev,u64 * id)70 int w1_eeprom_get_id(struct udevice *dev, u64 *id)
71 {
72 struct w1_device *w1 = dev_get_parent_platdata(dev);
73
74 if (!w1)
75 return -ENODEV;
76 *id = w1->id;
77
78 return 0;
79 }
80
81 UCLASS_DRIVER(w1_eeprom) = {
82 .name = "w1_eeprom",
83 .id = UCLASS_W1_EEPROM,
84 .flags = DM_UC_FLAG_SEQ_ALIAS,
85 #if CONFIG_IS_ENABLED(OF_CONTROL)
86 .post_bind = dm_scan_fdt_dev,
87 #endif
88 };
89
w1_eeprom_dm_init(void)90 int w1_eeprom_dm_init(void)
91 {
92 struct udevice *dev;
93 struct uclass *uc;
94 int ret;
95
96 ret = uclass_get(UCLASS_W1_EEPROM, &uc);
97 if (ret) {
98 debug("W1_EEPROM uclass not available\n");
99 return ret;
100 }
101
102 uclass_foreach_dev(dev, uc) {
103 ret = device_probe(dev);
104 if (ret == -ENODEV) { /* No such device. */
105 debug("W1_EEPROM not available.\n");
106 continue;
107 }
108
109 if (ret) { /* Other error. */
110 printf("W1_EEPROM probe failed, error %d\n", ret);
111 continue;
112 }
113 }
114
115 return 0;
116 }
117