mp5920.c

 1// SPDX-License-Identifier: GPL-2.0-or-later
 2/*
 3 * Hardware monitoring driver for MP5920 and compatible chips.
 4 */
 5
 6#include <linux/i2c.h>
 7#include <linux/minmax.h>
 8#include <linux/module.h>
 9#include <linux/of_device.h>
10#include "pmbus.h"
11
12static struct pmbus_driver_info mp5920_info = {
13	.pages = 1,
14	.format[PSC_VOLTAGE_IN] = direct,
15	.format[PSC_VOLTAGE_OUT] = direct,
16	.format[PSC_CURRENT_OUT] = direct,
17	.format[PSC_POWER] = direct,
18	.format[PSC_TEMPERATURE] = direct,
19	.m[PSC_VOLTAGE_IN] = 2266,
20	.b[PSC_VOLTAGE_IN] = 0,
21	.R[PSC_VOLTAGE_IN] = -1,
22	.m[PSC_VOLTAGE_OUT] = 2266,
23	.b[PSC_VOLTAGE_OUT] = 0,
24	.R[PSC_VOLTAGE_OUT] = -1,
25	.m[PSC_CURRENT_OUT] = 546,
26	.b[PSC_CURRENT_OUT] = 0,
27	.R[PSC_CURRENT_OUT] = -2,
28	.m[PSC_POWER] = 5840,
29	.b[PSC_POWER] = 0,
30	.R[PSC_POWER] = -3,
31	.m[PSC_TEMPERATURE] = 1067,
32	.b[PSC_TEMPERATURE] = 20500,
33	.R[PSC_TEMPERATURE] = -2,
34	.func[0] = PMBUS_HAVE_VIN  | PMBUS_HAVE_VOUT |
35		PMBUS_HAVE_IOUT | PMBUS_HAVE_POUT |
36		PMBUS_HAVE_TEMP,
37};
38
39static int mp5920_probe(struct i2c_client *client)
40{
41	struct device *dev =  &client->dev;
42	int ret;
43	u8 buf[I2C_SMBUS_BLOCK_MAX];
44
45	if (!i2c_check_functionality(client->adapter,
46				     I2C_FUNC_SMBUS_READ_WORD_DATA))
47		return -ENODEV;
48
49	ret = i2c_smbus_read_block_data(client, PMBUS_MFR_MODEL, buf);
50	if (ret < 0)
51		return dev_err_probe(dev, ret, "Failed to read PMBUS_MFR_MODEL\n");
52
53	if (ret != 6 || strncmp(buf, "MP5920", 6)) {
54		return dev_err_probe(dev, -ENODEV, "Model '%.*s' not supported\n",
55				     min_t(int, ret, sizeof(buf)), buf);
56	}
57
58	return pmbus_do_probe(client, &mp5920_info);
59}
60
61static const struct of_device_id mp5920_of_match[] = {
62	{ .compatible = "mps,mp5920" },
63	{ }
64};
65
66MODULE_DEVICE_TABLE(of, mp5920_of_match);
67
68static const struct i2c_device_id mp5920_id[] = {
69	{ "mp5920" },
70	{ }
71};
72
73MODULE_DEVICE_TABLE(i2c, mp5920_id);
74
75static struct i2c_driver mp5920_driver = {
76	.driver = {
77		.name = "mp5920",
78		.of_match_table = mp5920_of_match,
79	},
80	.probe = mp5920_probe,
81	.id_table = mp5920_id,
82};
83
84module_i2c_driver(mp5920_driver);
85
86MODULE_AUTHOR("Tony Ao <tony_ao@wiwynn.com>");
87MODULE_AUTHOR("Alex Vdovydchenko <xzeol@yahoo.com>");
88MODULE_DESCRIPTION("PMBus driver for MP5920 HSC");
89MODULE_LICENSE("GPL");
90MODULE_IMPORT_NS("PMBUS");