1 | // SPDX-License-Identifier: GPL-2.0+ |
2 | /* |
3 | * Hardware monitoring driver for Infineon IR36021 |
4 | * |
5 | * Copyright (c) 2021 Allied Telesis |
6 | */ |
7 | #include <linux/err.h> |
8 | #include <linux/i2c.h> |
9 | #include <linux/init.h> |
10 | #include <linux/kernel.h> |
11 | #include <linux/module.h> |
12 | #include "pmbus.h" |
13 | |
14 | static struct pmbus_driver_info ir36021_info = { |
15 | .pages = 1, |
16 | .format[PSC_VOLTAGE_IN] = linear, |
17 | .format[PSC_VOLTAGE_OUT] = linear, |
18 | .format[PSC_CURRENT_IN] = linear, |
19 | .format[PSC_CURRENT_OUT] = linear, |
20 | .format[PSC_POWER] = linear, |
21 | .format[PSC_TEMPERATURE] = linear, |
22 | .func[0] = PMBUS_HAVE_VIN | PMBUS_HAVE_VOUT |
23 | | PMBUS_HAVE_IIN | PMBUS_HAVE_IOUT |
24 | | PMBUS_HAVE_PIN | PMBUS_HAVE_POUT |
25 | | PMBUS_HAVE_TEMP | PMBUS_HAVE_TEMP2 |
26 | | PMBUS_HAVE_STATUS_TEMP, |
27 | }; |
28 | |
29 | static int ir36021_probe(struct i2c_client *client) |
30 | { |
31 | u8 buf[I2C_SMBUS_BLOCK_MAX]; |
32 | int ret; |
33 | |
34 | if (!i2c_check_functionality(adap: client->adapter, |
35 | I2C_FUNC_SMBUS_READ_BYTE_DATA |
36 | | I2C_FUNC_SMBUS_READ_WORD_DATA |
37 | | I2C_FUNC_SMBUS_READ_BLOCK_DATA)) |
38 | return -ENODEV; |
39 | |
40 | ret = i2c_smbus_read_i2c_block_data(client, command: PMBUS_MFR_MODEL, length: 2, values: buf); |
41 | if (ret < 0) { |
42 | dev_err(&client->dev, "Failed to read PMBUS_MFR_MODEL\n" ); |
43 | return ret; |
44 | } |
45 | if (ret != 2 || buf[0] != 0x01 || buf[1] != 0x2d) { |
46 | dev_err(&client->dev, "MFR_MODEL unrecognised\n" ); |
47 | return -ENODEV; |
48 | } |
49 | |
50 | return pmbus_do_probe(client, info: &ir36021_info); |
51 | } |
52 | |
53 | static const struct i2c_device_id ir36021_id[] = { |
54 | { "ir36021" , 0 }, |
55 | {}, |
56 | }; |
57 | MODULE_DEVICE_TABLE(i2c, ir36021_id); |
58 | |
59 | static const struct of_device_id __maybe_unused ir36021_of_id[] = { |
60 | { .compatible = "infineon,ir36021" }, |
61 | {}, |
62 | }; |
63 | MODULE_DEVICE_TABLE(of, ir36021_of_id); |
64 | |
65 | static struct i2c_driver ir36021_driver = { |
66 | .class = I2C_CLASS_HWMON, |
67 | .driver = { |
68 | .name = "ir36021" , |
69 | .of_match_table = of_match_ptr(ir36021_of_id), |
70 | }, |
71 | .probe = ir36021_probe, |
72 | .id_table = ir36021_id, |
73 | }; |
74 | |
75 | module_i2c_driver(ir36021_driver); |
76 | |
77 | MODULE_AUTHOR("Chris Packham <chris.packham@alliedtelesis.co.nz>" ); |
78 | MODULE_DESCRIPTION("PMBus driver for Infineon IR36021" ); |
79 | MODULE_LICENSE("GPL" ); |
80 | MODULE_IMPORT_NS(PMBUS); |
81 | |