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 "pmbus.h"
20
21 static struct pmbus_driver_info ir38064_info = {
22 .pages = 1,
23 .format[PSC_VOLTAGE_IN] = linear,
24 .format[PSC_VOLTAGE_OUT] = direct,
25 .format[PSC_CURRENT_OUT] = linear,
26 .format[PSC_POWER] = linear,
27 .format[PSC_TEMPERATURE] = linear,
28 .m[PSC_VOLTAGE_OUT] = 256,
29 .b[PSC_VOLTAGE_OUT] = 0,
30 .R[PSC_VOLTAGE_OUT] = 0,
31 .func[0] = PMBUS_HAVE_VIN | PMBUS_HAVE_STATUS_INPUT
32 | PMBUS_HAVE_TEMP | PMBUS_HAVE_STATUS_TEMP
33 | PMBUS_HAVE_VOUT | PMBUS_HAVE_STATUS_VOUT
34 | PMBUS_HAVE_IOUT | PMBUS_HAVE_STATUS_IOUT
35 | PMBUS_HAVE_POUT,
36 };
37
ir38064_probe(struct i2c_client * client)38 static int ir38064_probe(struct i2c_client *client)
39 {
40 return pmbus_do_probe(client, &ir38064_info);
41 }
42
43 static const struct i2c_device_id ir38064_id[] = {
44 {"ir38064", 0},
45 {}
46 };
47
48 MODULE_DEVICE_TABLE(i2c, ir38064_id);
49
50 /* This is the driver that will be inserted */
51 static struct i2c_driver ir38064_driver = {
52 .driver = {
53 .name = "ir38064",
54 },
55 .probe_new = ir38064_probe,
56 .id_table = ir38064_id,
57 };
58
59 module_i2c_driver(ir38064_driver);
60
61 MODULE_AUTHOR("Maxim Sloyko <maxims@google.com>");
62 MODULE_DESCRIPTION("PMBus driver for Infineon IR38064");
63 MODULE_LICENSE("GPL");
64 MODULE_IMPORT_NS(PMBUS);
65