diff options
Diffstat (limited to 'drivers/hwmon/pmbus/pxe1610.c')
| -rw-r--r-- | drivers/hwmon/pmbus/pxe1610.c | 151 |
1 files changed, 151 insertions, 0 deletions
diff --git a/drivers/hwmon/pmbus/pxe1610.c b/drivers/hwmon/pmbus/pxe1610.c new file mode 100644 index 0000000000..e2790a682d --- /dev/null +++ b/drivers/hwmon/pmbus/pxe1610.c @@ -0,0 +1,151 @@ +// SPDX-License-Identifier: GPL-2.0+ +/* + * Hardware monitoring driver for Infineon PXE1610 + * + * Copyright (c) 2019 Facebook Inc + * + */ + +#include <linux/err.h> +#include <linux/i2c.h> +#include <linux/init.h> +#include <linux/kernel.h> +#include <linux/module.h> +#include "pmbus.h" + +#define PXE1610_NUM_PAGES 3 + +/* Identify chip parameters. */ +static int pxe1610_identify(struct i2c_client *client, + struct pmbus_driver_info *info) +{ + int i; + + for (i = 0; i < PXE1610_NUM_PAGES; i++) { + if (pmbus_check_byte_register(client, i, PMBUS_VOUT_MODE)) { + u8 vout_mode; + int ret; + + /* Read the register with VOUT scaling value.*/ + ret = pmbus_read_byte_data(client, i, PMBUS_VOUT_MODE); + if (ret < 0) + return ret; + + vout_mode = ret & GENMASK(4, 0); + + switch (vout_mode) { + case 1: + info->vrm_version[i] = vr12; + break; + case 2: + info->vrm_version[i] = vr13; + break; + default: + /* + * If prior pages are available limit operation + * to them + */ + if (i != 0) { + info->pages = i; + return 0; + } + + return -ENODEV; + } + } + } + + return 0; +} + +static struct pmbus_driver_info pxe1610_info = { + .pages = PXE1610_NUM_PAGES, + .format[PSC_VOLTAGE_IN] = linear, + .format[PSC_VOLTAGE_OUT] = vid, + .format[PSC_CURRENT_IN] = linear, + .format[PSC_CURRENT_OUT] = linear, + .format[PSC_TEMPERATURE] = linear, + .format[PSC_POWER] = linear, + .func[0] = PMBUS_HAVE_VIN + | PMBUS_HAVE_VOUT | PMBUS_HAVE_IIN + | PMBUS_HAVE_IOUT | PMBUS_HAVE_PIN + | PMBUS_HAVE_POUT | PMBUS_HAVE_TEMP + | PMBUS_HAVE_STATUS_VOUT | PMBUS_HAVE_STATUS_IOUT + | PMBUS_HAVE_STATUS_INPUT | PMBUS_HAVE_STATUS_TEMP, + .func[1] = PMBUS_HAVE_VIN + | PMBUS_HAVE_VOUT | PMBUS_HAVE_IIN + | PMBUS_HAVE_IOUT | PMBUS_HAVE_PIN + | PMBUS_HAVE_POUT | PMBUS_HAVE_TEMP + | PMBUS_HAVE_STATUS_VOUT | PMBUS_HAVE_STATUS_IOUT + | PMBUS_HAVE_STATUS_INPUT | PMBUS_HAVE_STATUS_TEMP, + .func[2] = PMBUS_HAVE_VIN + | PMBUS_HAVE_VOUT | PMBUS_HAVE_IIN + | PMBUS_HAVE_IOUT | PMBUS_HAVE_PIN + | PMBUS_HAVE_POUT | PMBUS_HAVE_TEMP + | PMBUS_HAVE_STATUS_VOUT | PMBUS_HAVE_STATUS_IOUT + | PMBUS_HAVE_STATUS_INPUT | PMBUS_HAVE_STATUS_TEMP, + .identify = pxe1610_identify, +}; + +static int pxe1610_probe(struct i2c_client *client) +{ + struct pmbus_driver_info *info; + u8 buf[I2C_SMBUS_BLOCK_MAX]; + int ret; + + if (!i2c_check_functionality( + client->adapter, + I2C_FUNC_SMBUS_READ_BYTE_DATA + | I2C_FUNC_SMBUS_READ_WORD_DATA + | I2C_FUNC_SMBUS_READ_BLOCK_DATA)) + return -ENODEV; + + /* + * By default this device doesn't boot to page 0, so set page 0 + * to access all pmbus registers. + */ + i2c_smbus_write_byte_data(client, PMBUS_PAGE, 0); + + /* Read Manufacturer id */ + ret = i2c_smbus_read_block_data(client, PMBUS_MFR_ID, buf); + if (ret < 0) { + dev_err(&client->dev, "Failed to read PMBUS_MFR_ID\n"); + return ret; + } + if (ret != 2 || strncmp(buf, "XP", 2)) { + dev_err(&client->dev, "MFR_ID unrecognized\n"); + return -ENODEV; + } + + info = devm_kmemdup(&client->dev, &pxe1610_info, + sizeof(struct pmbus_driver_info), + GFP_KERNEL); + if (!info) + return -ENOMEM; + + return pmbus_do_probe(client, info); +} + +static const struct i2c_device_id pxe1610_id[] = { + {"pxe1610", 0}, + {"pxe1110", 0}, + {"pxm1310", 0}, + {} +}; + +MODULE_DEVICE_TABLE(i2c, pxe1610_id); + +static struct i2c_driver pxe1610_driver = { + .driver = { + .name = "pxe1610", + }, + .probe = pxe1610_probe, + .id_table = pxe1610_id, +}; + +module_i2c_driver(pxe1610_driver); + +MODULE_AUTHOR("Vijay Khemka <vijaykhemka@fb.com>"); +MODULE_DESCRIPTION("PMBus driver for Infineon PXE1610, PXE1110 and PXM1310"); +MODULE_LICENSE("GPL"); +MODULE_IMPORT_NS(PMBUS); |