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 <log.h>
16 #include <w1.h>
17 #include <w1-eeprom.h>
18
19 #include <dm/device-internal.h>
20
w1_eeprom_read_buf(struct udevice * dev,unsigned int offset,u8 * buf,unsigned int count)21 int w1_eeprom_read_buf(struct udevice *dev, unsigned int offset,
22 u8 *buf, unsigned int count)
23 {
24 const struct w1_eeprom_ops *ops = device_get_ops(dev);
25 u64 id = 0;
26 int ret;
27
28 if (!ops->read_buf)
29 return -ENOSYS;
30
31 ret = w1_eeprom_get_id(dev, &id);
32 if (ret)
33 return ret;
34 if (!id)
35 return -ENODEV;
36
37 return ops->read_buf(dev, offset, buf, count);
38 }
39
w1_eeprom_register_new_device(u64 id)40 int w1_eeprom_register_new_device(u64 id)
41 {
42 u8 family = id & 0xff;
43 int ret;
44 struct udevice *dev;
45
46 for (ret = uclass_first_device(UCLASS_W1_EEPROM, &dev);
47 !ret && dev;
48 uclass_next_device(&dev)) {
49 if (ret || !dev) {
50 debug("cannot find w1 eeprom dev\n");
51 return ret;
52 }
53 if (dev_get_driver_data(dev) == family) {
54 struct w1_device *w1;
55
56 w1 = dev_get_parent_plat(dev);
57 if (w1->id) /* device already in use */
58 continue;
59 w1->id = id;
60 debug("%s: Match found: %s:%s %llx\n", __func__,
61 dev->name, dev->driver->name, id);
62 return 0;
63 }
64 }
65
66 debug("%s: No matches found: error %d\n", __func__, ret);
67
68 return ret;
69 }
70
w1_eeprom_get_id(struct udevice * dev,u64 * id)71 int w1_eeprom_get_id(struct udevice *dev, u64 *id)
72 {
73 struct w1_device *w1 = dev_get_parent_plat(dev);
74
75 if (!w1)
76 return -ENODEV;
77 *id = w1->id;
78
79 return 0;
80 }
81
82 UCLASS_DRIVER(w1_eeprom) = {
83 .name = "w1_eeprom",
84 .id = UCLASS_W1_EEPROM,
85 .flags = DM_UC_FLAG_SEQ_ALIAS,
86 #if CONFIG_IS_ENABLED(OF_CONTROL)
87 .post_bind = dm_scan_fdt_dev,
88 #endif
89 };
90
w1_eeprom_dm_init(void)91 int w1_eeprom_dm_init(void)
92 {
93 struct udevice *dev;
94 struct uclass *uc;
95 int ret;
96
97 ret = uclass_get(UCLASS_W1_EEPROM, &uc);
98 if (ret) {
99 debug("W1_EEPROM uclass not available\n");
100 return ret;
101 }
102
103 uclass_foreach_dev(dev, uc) {
104 ret = device_probe(dev);
105 if (ret == -ENODEV) { /* No such device. */
106 debug("W1_EEPROM not available.\n");
107 continue;
108 }
109
110 if (ret) { /* Other error. */
111 printf("W1_EEPROM probe failed, error %d\n", ret);
112 continue;
113 }
114 }
115
116 return 0;
117 }
118