1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3 * Driver for MPS MPQ8785 Step-Down Converter
4 */
5
6 #include <linux/i2c.h>
7 #include <linux/module.h>
8 #include <linux/of_device.h>
9 #include "pmbus.h"
10
mpq8785_identify(struct i2c_client * client,struct pmbus_driver_info * info)11 static int mpq8785_identify(struct i2c_client *client,
12 struct pmbus_driver_info *info)
13 {
14 int vout_mode;
15
16 vout_mode = pmbus_read_byte_data(client, 0, PMBUS_VOUT_MODE);
17 if (vout_mode < 0 || vout_mode == 0xff)
18 return vout_mode < 0 ? vout_mode : -ENODEV;
19 switch (vout_mode >> 5) {
20 case 0:
21 info->format[PSC_VOLTAGE_OUT] = linear;
22 break;
23 case 1:
24 case 2:
25 info->format[PSC_VOLTAGE_OUT] = direct,
26 info->m[PSC_VOLTAGE_OUT] = 64;
27 info->b[PSC_VOLTAGE_OUT] = 0;
28 info->R[PSC_VOLTAGE_OUT] = 1;
29 break;
30 default:
31 return -ENODEV;
32 }
33
34 return 0;
35 };
36
37 static struct pmbus_driver_info mpq8785_info = {
38 .pages = 1,
39 .format[PSC_VOLTAGE_IN] = direct,
40 .format[PSC_CURRENT_OUT] = direct,
41 .format[PSC_TEMPERATURE] = direct,
42 .m[PSC_VOLTAGE_IN] = 4,
43 .b[PSC_VOLTAGE_IN] = 0,
44 .R[PSC_VOLTAGE_IN] = 1,
45 .m[PSC_CURRENT_OUT] = 16,
46 .b[PSC_CURRENT_OUT] = 0,
47 .R[PSC_CURRENT_OUT] = 0,
48 .m[PSC_TEMPERATURE] = 1,
49 .b[PSC_TEMPERATURE] = 0,
50 .R[PSC_TEMPERATURE] = 0,
51 .func[0] =
52 PMBUS_HAVE_VIN | PMBUS_HAVE_STATUS_INPUT |
53 PMBUS_HAVE_VOUT | PMBUS_HAVE_STATUS_VOUT |
54 PMBUS_HAVE_IOUT | PMBUS_HAVE_STATUS_IOUT |
55 PMBUS_HAVE_TEMP | PMBUS_HAVE_STATUS_TEMP,
56 .identify = mpq8785_identify,
57 };
58
mpq8785_probe(struct i2c_client * client)59 static int mpq8785_probe(struct i2c_client *client)
60 {
61 return pmbus_do_probe(client, &mpq8785_info);
62 };
63
64 static const struct i2c_device_id mpq8785_id[] = {
65 { "mpq8785" },
66 { },
67 };
68 MODULE_DEVICE_TABLE(i2c, mpq8785_id);
69
70 static const struct of_device_id __maybe_unused mpq8785_of_match[] = {
71 { .compatible = "mps,mpq8785" },
72 {}
73 };
74 MODULE_DEVICE_TABLE(of, mpq8785_of_match);
75
76 static struct i2c_driver mpq8785_driver = {
77 .driver = {
78 .name = "mpq8785",
79 .of_match_table = of_match_ptr(mpq8785_of_match),
80 },
81 .probe = mpq8785_probe,
82 .id_table = mpq8785_id,
83 };
84
85 module_i2c_driver(mpq8785_driver);
86
87 MODULE_AUTHOR("Charles Hsu <ythsu0511@gmail.com>");
88 MODULE_DESCRIPTION("PMBus driver for MPS MPQ8785");
89 MODULE_LICENSE("GPL");
90 MODULE_IMPORT_NS(PMBUS);
91