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