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208 lines
4.8 KiB
208 lines
4.8 KiB
// SPDX-License-Identifier: GPL-2.0-or-later |
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/* |
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* Hardware monitoring driver for BluTek BPA-RS600 Power Supplies |
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* |
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* Copyright 2021 Allied Telesis Labs |
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*/ |
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#include <linux/i2c.h> |
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#include <linux/init.h> |
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#include <linux/kernel.h> |
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#include <linux/module.h> |
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#include <linux/pmbus.h> |
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#include "pmbus.h" |
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enum chips { bpa_rs600, bpd_rs600 }; |
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static int bpa_rs600_read_byte_data(struct i2c_client *client, int page, int reg) |
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{ |
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int ret; |
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if (page > 0) |
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return -ENXIO; |
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switch (reg) { |
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case PMBUS_FAN_CONFIG_12: |
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/* |
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* Two fans are reported in PMBUS_FAN_CONFIG_12 but there is |
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* only one fan in the module. Mask out the FAN2 bits. |
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*/ |
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ret = pmbus_read_byte_data(client, 0, PMBUS_FAN_CONFIG_12); |
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if (ret >= 0) |
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ret &= ~(PB_FAN_2_INSTALLED | PB_FAN_2_PULSE_MASK); |
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break; |
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default: |
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ret = -ENODATA; |
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break; |
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} |
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return ret; |
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} |
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/* |
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* The BPA-RS600 violates the PMBus spec. Specifically it treats the |
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* mantissa as unsigned. Deal with this here to allow the PMBus core |
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* to work with correctly encoded data. |
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*/ |
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static int bpa_rs600_read_vin(struct i2c_client *client) |
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{ |
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int ret, exponent, mantissa; |
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ret = pmbus_read_word_data(client, 0, 0xff, PMBUS_READ_VIN); |
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if (ret < 0) |
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return ret; |
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if (ret & BIT(10)) { |
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exponent = ret >> 11; |
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mantissa = ret & 0x7ff; |
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exponent++; |
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mantissa >>= 1; |
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ret = (exponent << 11) | mantissa; |
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} |
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return ret; |
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} |
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/* |
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* Firmware V5.70 incorrectly reports 1640W for MFR_PIN_MAX. |
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* Deal with this by returning a sensible value. |
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*/ |
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static int bpa_rs600_read_pin_max(struct i2c_client *client) |
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{ |
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int ret; |
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ret = pmbus_read_word_data(client, 0, 0xff, PMBUS_MFR_PIN_MAX); |
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if (ret < 0) |
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return ret; |
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/* Detect invalid 1640W (linear encoding) */ |
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if (ret == 0x0b34) |
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/* Report 700W (linear encoding) */ |
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return 0x095e; |
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return ret; |
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} |
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static int bpa_rs600_read_word_data(struct i2c_client *client, int page, int phase, int reg) |
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{ |
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int ret; |
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if (page > 0) |
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return -ENXIO; |
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switch (reg) { |
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case PMBUS_VIN_UV_WARN_LIMIT: |
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case PMBUS_VIN_OV_WARN_LIMIT: |
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case PMBUS_VOUT_UV_WARN_LIMIT: |
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case PMBUS_VOUT_OV_WARN_LIMIT: |
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case PMBUS_IIN_OC_WARN_LIMIT: |
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case PMBUS_IOUT_OC_WARN_LIMIT: |
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case PMBUS_PIN_OP_WARN_LIMIT: |
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case PMBUS_POUT_OP_WARN_LIMIT: |
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case PMBUS_VIN_UV_FAULT_LIMIT: |
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case PMBUS_VIN_OV_FAULT_LIMIT: |
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case PMBUS_VOUT_UV_FAULT_LIMIT: |
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case PMBUS_VOUT_OV_FAULT_LIMIT: |
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/* These commands return data but it is invalid/un-documented */ |
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ret = -ENXIO; |
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break; |
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case PMBUS_READ_VIN: |
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ret = bpa_rs600_read_vin(client); |
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break; |
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case PMBUS_MFR_PIN_MAX: |
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ret = bpa_rs600_read_pin_max(client); |
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break; |
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default: |
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if (reg >= PMBUS_VIRT_BASE) |
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ret = -ENXIO; |
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else |
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ret = -ENODATA; |
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break; |
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} |
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return ret; |
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} |
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static struct pmbus_driver_info bpa_rs600_info = { |
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.pages = 1, |
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.format[PSC_VOLTAGE_IN] = linear, |
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.format[PSC_VOLTAGE_OUT] = linear, |
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.format[PSC_CURRENT_IN] = linear, |
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.format[PSC_CURRENT_OUT] = linear, |
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.format[PSC_POWER] = linear, |
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.format[PSC_TEMPERATURE] = linear, |
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.format[PSC_FAN] = linear, |
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.func[0] = PMBUS_HAVE_VIN | PMBUS_HAVE_VOUT | |
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PMBUS_HAVE_IIN | PMBUS_HAVE_IOUT | |
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PMBUS_HAVE_PIN | PMBUS_HAVE_POUT | |
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PMBUS_HAVE_TEMP | PMBUS_HAVE_TEMP2 | |
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PMBUS_HAVE_FAN12 | |
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PMBUS_HAVE_STATUS_VOUT | PMBUS_HAVE_STATUS_IOUT | |
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PMBUS_HAVE_STATUS_INPUT | PMBUS_HAVE_STATUS_TEMP | |
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PMBUS_HAVE_STATUS_FAN12, |
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.read_byte_data = bpa_rs600_read_byte_data, |
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.read_word_data = bpa_rs600_read_word_data, |
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}; |
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static const struct i2c_device_id bpa_rs600_id[] = { |
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{ "bpa-rs600", bpa_rs600 }, |
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{ "bpd-rs600", bpd_rs600 }, |
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{}, |
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}; |
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MODULE_DEVICE_TABLE(i2c, bpa_rs600_id); |
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static int bpa_rs600_probe(struct i2c_client *client) |
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{ |
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struct device *dev = &client->dev; |
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u8 buf[I2C_SMBUS_BLOCK_MAX + 1]; |
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int ret; |
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const struct i2c_device_id *mid; |
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if (!i2c_check_functionality(client->adapter, |
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I2C_FUNC_SMBUS_READ_BYTE_DATA |
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| I2C_FUNC_SMBUS_READ_WORD_DATA |
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| I2C_FUNC_SMBUS_READ_BLOCK_DATA)) |
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return -ENODEV; |
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ret = i2c_smbus_read_block_data(client, PMBUS_MFR_MODEL, buf); |
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if (ret < 0) { |
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dev_err(dev, "Failed to read Manufacturer Model\n"); |
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return ret; |
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} |
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for (mid = bpa_rs600_id; mid->name[0]; mid++) { |
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if (!strncasecmp(buf, mid->name, strlen(mid->name))) |
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break; |
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} |
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if (!mid->name[0]) { |
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buf[ret] = '\0'; |
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dev_err(dev, "Unsupported Manufacturer Model '%s'\n", buf); |
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return -ENODEV; |
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} |
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return pmbus_do_probe(client, &bpa_rs600_info); |
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} |
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static const struct of_device_id __maybe_unused bpa_rs600_of_match[] = { |
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{ .compatible = "blutek,bpa-rs600" }, |
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{}, |
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}; |
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MODULE_DEVICE_TABLE(of, bpa_rs600_of_match); |
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static struct i2c_driver bpa_rs600_driver = { |
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.driver = { |
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.name = "bpa-rs600", |
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.of_match_table = of_match_ptr(bpa_rs600_of_match), |
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}, |
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.probe_new = bpa_rs600_probe, |
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.id_table = bpa_rs600_id, |
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}; |
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module_i2c_driver(bpa_rs600_driver); |
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MODULE_AUTHOR("Chris Packham"); |
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MODULE_DESCRIPTION("PMBus driver for BluTek BPA-RS600"); |
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MODULE_LICENSE("GPL"); |
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MODULE_IMPORT_NS(PMBUS);
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