tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
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");