xref: /openbmc/linux/drivers/hwmon/pmbus/ir38064.c (revision 39f03438)
1 // SPDX-License-Identifier: GPL-2.0+
2 /*
3  * Hardware monitoring driver for Infineon IR38064
4  *
5  * Copyright (c) 2017 Google Inc
6  *
7  * VOUT_MODE is not supported by the device. The driver fakes VOUT linear16
8  * mode with exponent value -8 as direct mode with m=256/b=0/R=0.
9  *
10  * The device supports VOUT_PEAK, IOUT_PEAK, and TEMPERATURE_PEAK, however
11  * this driver does not currently support them.
12  */
13 
14 #include <linux/err.h>
15 #include <linux/i2c.h>
16 #include <linux/init.h>
17 #include <linux/kernel.h>
18 #include <linux/module.h>
19 #include <linux/of.h>
20 #include <linux/regulator/driver.h>
21 #include "pmbus.h"
22 
23 #if IS_ENABLED(CONFIG_SENSORS_IR38064_REGULATOR)
24 static const struct regulator_desc ir38064_reg_desc[] = {
25 	PMBUS_REGULATOR("vout", 0),
26 };
27 #endif /* CONFIG_SENSORS_IR38064_REGULATOR */
28 
29 static struct pmbus_driver_info ir38064_info = {
30 	.pages = 1,
31 	.format[PSC_VOLTAGE_IN] = linear,
32 	.format[PSC_VOLTAGE_OUT] = direct,
33 	.format[PSC_CURRENT_OUT] = linear,
34 	.format[PSC_POWER] = linear,
35 	.format[PSC_TEMPERATURE] = linear,
36 	.m[PSC_VOLTAGE_OUT] = 256,
37 	.b[PSC_VOLTAGE_OUT] = 0,
38 	.R[PSC_VOLTAGE_OUT] = 0,
39 	.func[0] = PMBUS_HAVE_VIN | PMBUS_HAVE_STATUS_INPUT
40 	    | PMBUS_HAVE_TEMP | PMBUS_HAVE_STATUS_TEMP
41 	    | PMBUS_HAVE_VOUT | PMBUS_HAVE_STATUS_VOUT
42 	    | PMBUS_HAVE_IOUT | PMBUS_HAVE_STATUS_IOUT
43 	    | PMBUS_HAVE_POUT,
44 #if IS_ENABLED(CONFIG_SENSORS_IR38064_REGULATOR)
45 	.num_regulators = 1,
46 	.reg_desc = ir38064_reg_desc,
47 #endif
48 };
49 
ir38064_probe(struct i2c_client * client)50 static int ir38064_probe(struct i2c_client *client)
51 {
52 	return pmbus_do_probe(client, &ir38064_info);
53 }
54 
55 static const struct i2c_device_id ir38064_id[] = {
56 	{"ir38060", 0},
57 	{"ir38064", 0},
58 	{"ir38164", 0},
59 	{"ir38263", 0},
60 	{}
61 };
62 
63 MODULE_DEVICE_TABLE(i2c, ir38064_id);
64 
65 static const struct of_device_id __maybe_unused ir38064_of_match[] = {
66 	{ .compatible = "infineon,ir38060" },
67 	{ .compatible = "infineon,ir38064" },
68 	{ .compatible = "infineon,ir38164" },
69 	{ .compatible = "infineon,ir38263" },
70 	{}
71 };
72 
73 MODULE_DEVICE_TABLE(of, ir38064_of_match);
74 
75 /* This is the driver that will be inserted */
76 static struct i2c_driver ir38064_driver = {
77 	.driver = {
78 		   .name = "ir38064",
79 		   .of_match_table = of_match_ptr(ir38064_of_match),
80 		   },
81 	.probe = ir38064_probe,
82 	.id_table = ir38064_id,
83 };
84 
85 module_i2c_driver(ir38064_driver);
86 
87 MODULE_AUTHOR("Maxim Sloyko <maxims@google.com>");
88 MODULE_DESCRIPTION("PMBus driver for Infineon IR38064 and compatible chips");
89 MODULE_LICENSE("GPL");
90 MODULE_IMPORT_NS(PMBUS);
91