1f20b4a93SCharles Hsu // SPDX-License-Identifier: GPL-2.0-or-later
2f20b4a93SCharles Hsu /*
3f20b4a93SCharles Hsu * Driver for MPS MPQ8785 Step-Down Converter
4f20b4a93SCharles Hsu */
5f20b4a93SCharles Hsu
6f20b4a93SCharles Hsu #include <linux/i2c.h>
7f20b4a93SCharles Hsu #include <linux/module.h>
8f20b4a93SCharles Hsu #include <linux/of_device.h>
9f20b4a93SCharles Hsu #include "pmbus.h"
10f20b4a93SCharles Hsu
mpq8785_identify(struct i2c_client * client,struct pmbus_driver_info * info)11f20b4a93SCharles Hsu static int mpq8785_identify(struct i2c_client *client,
12f20b4a93SCharles Hsu struct pmbus_driver_info *info)
13f20b4a93SCharles Hsu {
14f20b4a93SCharles Hsu int vout_mode;
15f20b4a93SCharles Hsu
16f20b4a93SCharles Hsu vout_mode = pmbus_read_byte_data(client, 0, PMBUS_VOUT_MODE);
17f20b4a93SCharles Hsu if (vout_mode < 0 || vout_mode == 0xff)
18f20b4a93SCharles Hsu return vout_mode < 0 ? vout_mode : -ENODEV;
19f20b4a93SCharles Hsu switch (vout_mode >> 5) {
20f20b4a93SCharles Hsu case 0:
21f20b4a93SCharles Hsu info->format[PSC_VOLTAGE_OUT] = linear;
22f20b4a93SCharles Hsu break;
23f20b4a93SCharles Hsu case 1:
24f20b4a93SCharles Hsu case 2:
25f20b4a93SCharles Hsu info->format[PSC_VOLTAGE_OUT] = direct,
26f20b4a93SCharles Hsu info->m[PSC_VOLTAGE_OUT] = 64;
27f20b4a93SCharles Hsu info->b[PSC_VOLTAGE_OUT] = 0;
28f20b4a93SCharles Hsu info->R[PSC_VOLTAGE_OUT] = 1;
29f20b4a93SCharles Hsu break;
30f20b4a93SCharles Hsu default:
31f20b4a93SCharles Hsu return -ENODEV;
32f20b4a93SCharles Hsu }
33f20b4a93SCharles Hsu
34f20b4a93SCharles Hsu return 0;
35f20b4a93SCharles Hsu };
36f20b4a93SCharles Hsu
37f20b4a93SCharles Hsu static struct pmbus_driver_info mpq8785_info = {
38f20b4a93SCharles Hsu .pages = 1,
39f20b4a93SCharles Hsu .format[PSC_VOLTAGE_IN] = direct,
40f20b4a93SCharles Hsu .format[PSC_CURRENT_OUT] = direct,
41f20b4a93SCharles Hsu .format[PSC_TEMPERATURE] = direct,
42f20b4a93SCharles Hsu .m[PSC_VOLTAGE_IN] = 4,
43f20b4a93SCharles Hsu .b[PSC_VOLTAGE_IN] = 0,
44f20b4a93SCharles Hsu .R[PSC_VOLTAGE_IN] = 1,
45f20b4a93SCharles Hsu .m[PSC_CURRENT_OUT] = 16,
46f20b4a93SCharles Hsu .b[PSC_CURRENT_OUT] = 0,
47f20b4a93SCharles Hsu .R[PSC_CURRENT_OUT] = 0,
48f20b4a93SCharles Hsu .m[PSC_TEMPERATURE] = 1,
49f20b4a93SCharles Hsu .b[PSC_TEMPERATURE] = 0,
50f20b4a93SCharles Hsu .R[PSC_TEMPERATURE] = 0,
51f20b4a93SCharles Hsu .func[0] =
52f20b4a93SCharles Hsu PMBUS_HAVE_VIN | PMBUS_HAVE_STATUS_INPUT |
53f20b4a93SCharles Hsu PMBUS_HAVE_VOUT | PMBUS_HAVE_STATUS_VOUT |
54f20b4a93SCharles Hsu PMBUS_HAVE_IOUT | PMBUS_HAVE_STATUS_IOUT |
55f20b4a93SCharles Hsu PMBUS_HAVE_TEMP | PMBUS_HAVE_STATUS_TEMP,
56f20b4a93SCharles Hsu .identify = mpq8785_identify,
57f20b4a93SCharles Hsu };
58f20b4a93SCharles Hsu
mpq8785_probe(struct i2c_client * client)59f20b4a93SCharles Hsu static int mpq8785_probe(struct i2c_client *client)
60f20b4a93SCharles Hsu {
61f20b4a93SCharles Hsu return pmbus_do_probe(client, &mpq8785_info);
62f20b4a93SCharles Hsu };
63f20b4a93SCharles Hsu
64f20b4a93SCharles Hsu static const struct i2c_device_id mpq8785_id[] = {
65*d8a66f36SUwe Kleine-König { "mpq8785" },
66f20b4a93SCharles Hsu { },
67f20b4a93SCharles Hsu };
68f20b4a93SCharles Hsu MODULE_DEVICE_TABLE(i2c, mpq8785_id);
69f20b4a93SCharles Hsu
70f20b4a93SCharles Hsu static const struct of_device_id __maybe_unused mpq8785_of_match[] = {
71f20b4a93SCharles Hsu { .compatible = "mps,mpq8785" },
72f20b4a93SCharles Hsu {}
73f20b4a93SCharles Hsu };
74f20b4a93SCharles Hsu MODULE_DEVICE_TABLE(of, mpq8785_of_match);
75f20b4a93SCharles Hsu
76f20b4a93SCharles Hsu static struct i2c_driver mpq8785_driver = {
77f20b4a93SCharles Hsu .driver = {
78f20b4a93SCharles Hsu .name = "mpq8785",
79f20b4a93SCharles Hsu .of_match_table = of_match_ptr(mpq8785_of_match),
80f20b4a93SCharles Hsu },
81f20b4a93SCharles Hsu .probe = mpq8785_probe,
82f20b4a93SCharles Hsu .id_table = mpq8785_id,
83f20b4a93SCharles Hsu };
84f20b4a93SCharles Hsu
85f20b4a93SCharles Hsu module_i2c_driver(mpq8785_driver);
86f20b4a93SCharles Hsu
87f20b4a93SCharles Hsu MODULE_AUTHOR("Charles Hsu <ythsu0511@gmail.com>");
88f20b4a93SCharles Hsu MODULE_DESCRIPTION("PMBus driver for MPS MPQ8785");
89f20b4a93SCharles Hsu MODULE_LICENSE("GPL");
90f20b4a93SCharles Hsu MODULE_IMPORT_NS(PMBUS);
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