Chris Packham | e20a719 | 2021-03-01 16:59:54 +1300 | [diff] [blame] | 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[] = { |
| 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_new = 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"); |
Guenter Roeck | b94ca77 | 2021-04-19 23:07:07 -0700 | [diff] [blame] | 80 | MODULE_IMPORT_NS(PMBUS); |