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e20a7198 CP |
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(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, PMBUS_MFR_MODEL, 2, 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, &ir36021_info); | |
51 | } | |
52 | ||
53 | static const struct i2c_device_id ir36021_id[] = { | |
d8a66f36 | 54 | { "ir36021" }, |
e20a7198 CP |
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 = { | |
e20a7198 CP |
66 | .driver = { |
67 | .name = "ir36021", | |
68 | .of_match_table = of_match_ptr(ir36021_of_id), | |
69 | }, | |
1975d167 | 70 | .probe = ir36021_probe, |
e20a7198 CP |
71 | .id_table = ir36021_id, |
72 | }; | |
73 | ||
74 | module_i2c_driver(ir36021_driver); | |
75 | ||
76 | MODULE_AUTHOR("Chris Packham <chris.packham@alliedtelesis.co.nz>"); | |
77 | MODULE_DESCRIPTION("PMBus driver for Infineon IR36021"); | |
78 | MODULE_LICENSE("GPL"); | |
b94ca77e | 79 | MODULE_IMPORT_NS(PMBUS); |