diff options
Diffstat (limited to 'drivers/hwmon/pmbus/xdpe12284.c')
| -rw-r--r-- | drivers/hwmon/pmbus/xdpe12284.c | 171 |
1 files changed, 171 insertions, 0 deletions
diff --git a/drivers/hwmon/pmbus/xdpe12284.c b/drivers/hwmon/pmbus/xdpe12284.c new file mode 100644 index 000000000000..660556b89e9f --- /dev/null +++ b/drivers/hwmon/pmbus/xdpe12284.c @@ -0,0 +1,171 @@ +// SPDX-License-Identifier: GPL-2.0-or-later +/* + * Hardware monitoring driver for Infineon Multi-phase Digital VR Controllers + * + * Copyright (c) 2020 Mellanox Technologies. All rights reserved. + */ + +#include <linux/err.h> +#include <linux/i2c.h> +#include <linux/init.h> +#include <linux/kernel.h> +#include <linux/module.h> +#include "pmbus.h" + +#define XDPE122_PROT_VR12_5MV 0x01 /* VR12.0 mode, 5-mV DAC */ +#define XDPE122_PROT_VR12_5_10MV 0x02 /* VR12.5 mode, 10-mV DAC */ +#define XDPE122_PROT_IMVP9_10MV 0x03 /* IMVP9 mode, 10-mV DAC */ +#define XDPE122_AMD_625MV 0x10 /* AMD mode 6.25mV */ +#define XDPE122_PAGE_NUM 2 + +static int xdpe122_read_word_data(struct i2c_client *client, int page, int reg) +{ + const struct pmbus_driver_info *info = pmbus_get_driver_info(client); + long val; + s16 exponent; + s32 mantissa; + int ret; + + switch (reg) { + case PMBUS_VOUT_OV_FAULT_LIMIT: + case PMBUS_VOUT_UV_FAULT_LIMIT: + ret = pmbus_read_word_data(client, page, reg); + if (ret < 0) + return ret; + + /* Convert register value to LINEAR11 data. */ + exponent = ((s16)ret) >> 11; + mantissa = ((s16)((ret & GENMASK(10, 0)) << 5)) >> 5; + val = mantissa * 1000L; + if (exponent >= 0) + val <<= exponent; + else + val >>= -exponent; + + /* Convert data to VID register. */ + switch (info->vrm_version[page]) { + case vr13: + if (val >= 500) + return 1 + DIV_ROUND_CLOSEST(val - 500, 10); + return 0; + case vr12: + if (val >= 250) + return 1 + DIV_ROUND_CLOSEST(val - 250, 5); + return 0; + case imvp9: + if (val >= 200) + return 1 + DIV_ROUND_CLOSEST(val - 200, 10); + return 0; + case amd625mv: + if (val >= 200 && val <= 1550) + return DIV_ROUND_CLOSEST((1550 - val) * 100, + 625); + return 0; + default: + return -EINVAL; + } + default: + return -ENODATA; + } + + return 0; +} + +static int xdpe122_identify(struct i2c_client *client, + struct pmbus_driver_info *info) +{ + u8 vout_params; + int i, ret; + + for (i = 0; i < XDPE122_PAGE_NUM; i++) { + /* Read the register with VOUT scaling value.*/ + ret = pmbus_read_byte_data(client, i, PMBUS_VOUT_MODE); + if (ret < 0) + return ret; + + vout_params = ret & GENMASK(4, 0); + + switch (vout_params) { + case XDPE122_PROT_VR12_5_10MV: + info->vrm_version[i] = vr13; + break; + case XDPE122_PROT_VR12_5MV: + info->vrm_version[i] = vr12; + break; + case XDPE122_PROT_IMVP9_10MV: + info->vrm_version[i] = imvp9; + break; + case XDPE122_AMD_625MV: + info->vrm_version[i] = amd625mv; + break; + default: + return -EINVAL; + } + } + + return 0; +} + +static struct pmbus_driver_info xdpe122_info = { + .pages = XDPE122_PAGE_NUM, + .format[PSC_VOLTAGE_IN] = linear, + .format[PSC_VOLTAGE_OUT] = vid, + .format[PSC_TEMPERATURE] = linear, + .format[PSC_CURRENT_IN] = linear, + .format[PSC_CURRENT_OUT] = linear, + .format[PSC_POWER] = linear, + .func[0] = PMBUS_HAVE_VIN | PMBUS_HAVE_VOUT | PMBUS_HAVE_STATUS_VOUT | + PMBUS_HAVE_IIN | PMBUS_HAVE_IOUT | PMBUS_HAVE_STATUS_IOUT | + PMBUS_HAVE_TEMP | PMBUS_HAVE_STATUS_TEMP | + PMBUS_HAVE_POUT | PMBUS_HAVE_PIN | PMBUS_HAVE_STATUS_INPUT, + .func[1] = PMBUS_HAVE_VIN | PMBUS_HAVE_VOUT | PMBUS_HAVE_STATUS_VOUT | + PMBUS_HAVE_IIN | PMBUS_HAVE_IOUT | PMBUS_HAVE_STATUS_IOUT | + PMBUS_HAVE_TEMP | PMBUS_HAVE_STATUS_TEMP | + PMBUS_HAVE_POUT | PMBUS_HAVE_PIN | PMBUS_HAVE_STATUS_INPUT, + .identify = xdpe122_identify, + .read_word_data = xdpe122_read_word_data, +}; + +static int xdpe122_probe(struct i2c_client *client, + const struct i2c_device_id *id) +{ + struct pmbus_driver_info *info; + + info = devm_kmemdup(&client->dev, &xdpe122_info, sizeof(*info), + GFP_KERNEL); + if (!info) + return -ENOMEM; + + return pmbus_do_probe(client, id, info); +} + +static const struct i2c_device_id xdpe122_id[] = { + {"xdpe12254", 0}, + {"xdpe12284", 0}, + {} +}; + +MODULE_DEVICE_TABLE(i2c, xdpe122_id); + +static const struct of_device_id __maybe_unused xdpe122_of_match[] = { + {.compatible = "infineon,xdpe12254"}, + {.compatible = "infineon,xdpe12284"}, + {} +}; +MODULE_DEVICE_TABLE(of, xdpe122_of_match); + +static struct i2c_driver xdpe122_driver = { + .driver = { + .name = "xdpe12284", + .of_match_table = of_match_ptr(xdpe122_of_match), + }, + .probe = xdpe122_probe, + .remove = pmbus_do_remove, + .id_table = xdpe122_id, +}; + +module_i2c_driver(xdpe122_driver); + +MODULE_AUTHOR("Vadim Pasternak <vadimp@mellanox.com>"); +MODULE_DESCRIPTION("PMBus driver for Infineon XDPE122 family"); +MODULE_LICENSE("GPL"); |