hwmon: Add driver for fsp-3y PSUs and PDUs
This patch adds support for these devices: - YH-5151E - the PDU - YM-2151E - the PSU The device datasheet says that the devices support PMBus 1.2, but in my testing, a lot of the commands aren't supported and if they are, they sometimes behave strangely or inconsistently. For example, writes to the PAGE command requires using PEC, otherwise the write won't work and the page won't switch, even though, the standard says that PEC is optional. On the other hand, writes to SMBALERT don't require PEC. Because of this, the driver is mostly reverse engineered with the help of a tool called pmbus_peek written by David Brownell (and later adopted by my colleague Jan Kundrát). The device also has some sort of a timing issue when switching pages, which is explained further in the code. Because of this, the driver support is limited. It exposes only the values that have been tested to work correctly. Signed-off-by: Václav Kubernát <kubernat@cesnet.cz> Link: https://lore.kernel.org/r/20210414080019.3530794-1-kubernat@cesnet.cz [groeck: Fixed up "missing braces around initializer" from 0-day] Signed-off-by: Guenter Roeck <linux@roeck-us.net>
This commit is contained in:
Václav Kubernát
Guenter Roeck
parent
25b000a80b
commit
1734b4135a
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@ -0,0 +1,28 @@
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.. SPDX-License-Identifier: GPL-2.0
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Kernel driver fsp3y
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======================
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Supported devices:
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* 3Y POWER YH-5151E
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* 3Y POWER YM-2151E
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Author: Václav Kubernát <kubernat@cesnet.cz>
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Description
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-----------
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This driver implements limited support for two 3Y POWER devices.
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Sysfs entries
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-------------
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* in1_input input voltage
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* in2_input 12V output voltage
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* in3_input 5V output voltage
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* curr1_input input current
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* curr2_input 12V output current
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* curr3_input 5V output current
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* fan1_input fan rpm
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* temp1_input temperature 1
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* temp2_input temperature 2
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* temp3_input temperature 3
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* power1_input input power
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* power2_input output power
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@ -63,6 +63,7 @@ Hardware Monitoring Kernel Drivers
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f71805f
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f71882fg
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fam15h_power
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fsp-3y
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ftsteutates
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g760a
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g762
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@ -65,6 +65,16 @@ config SENSORS_BPA_RS600
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This driver can also be built as a module. If so, the module will
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be called bpa-rs600.
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config SENSORS_FSP_3Y
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tristate "FSP/3Y-Power power supplies"
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help
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If you say yes here you get hardware monitoring support for
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FSP/3Y-Power hot-swap power supplies.
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Supported models: YH-5151E, YM-2151E
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This driver can also be built as a module. If so, the module will
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be called fsp-3y.
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config SENSORS_IBM_CFFPS
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tristate "IBM Common Form Factor Power Supply"
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depends on LEDS_CLASS
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@ -9,6 +9,7 @@ obj-$(CONFIG_SENSORS_ADM1266) += adm1266.o
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obj-$(CONFIG_SENSORS_ADM1275) += adm1275.o
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obj-$(CONFIG_SENSORS_BEL_PFE) += bel-pfe.o
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obj-$(CONFIG_SENSORS_BPA_RS600) += bpa-rs600.o
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obj-$(CONFIG_SENSORS_FSP_3Y) += fsp-3y.o
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obj-$(CONFIG_SENSORS_IBM_CFFPS) += ibm-cffps.o
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obj-$(CONFIG_SENSORS_INSPUR_IPSPS) += inspur-ipsps.o
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obj-$(CONFIG_SENSORS_IR35221) += ir35221.o
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@ -0,0 +1,253 @@
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// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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* Hardware monitoring driver for FSP 3Y-Power PSUs
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*
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* Copyright (c) 2021 Václav Kubernát, CESNET
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*
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* This driver is mostly reverse engineered with the help of a tool called pmbus_peek written by
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* David Brownell (and later adopted by Jan Kundrát). The device has some sort of a timing issue
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* when switching pages, details are explained in the code. The driver support is limited. It
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* exposes only the values, that have been tested to work correctly. Unsupported values either
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* aren't supported by the devices or their encondings are unknown.
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*/
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#include <linux/delay.h>
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#include <linux/i2c.h>
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include "pmbus.h"
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#define YM2151_PAGE_12V_LOG 0x00
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#define YM2151_PAGE_12V_REAL 0x00
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#define YM2151_PAGE_5VSB_LOG 0x01
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#define YM2151_PAGE_5VSB_REAL 0x20
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#define YH5151E_PAGE_12V_LOG 0x00
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#define YH5151E_PAGE_12V_REAL 0x00
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#define YH5151E_PAGE_5V_LOG 0x01
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#define YH5151E_PAGE_5V_REAL 0x10
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#define YH5151E_PAGE_3V3_LOG 0x02
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#define YH5151E_PAGE_3V3_REAL 0x11
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enum chips {
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ym2151e,
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yh5151e
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};
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struct fsp3y_data {
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struct pmbus_driver_info info;
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int chip;
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int page;
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};
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#define to_fsp3y_data(x) container_of(x, struct fsp3y_data, info)
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static int page_log_to_page_real(int page_log, enum chips chip)
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{
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switch (chip) {
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case ym2151e:
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switch (page_log) {
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case YM2151_PAGE_12V_LOG:
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return YM2151_PAGE_12V_REAL;
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case YM2151_PAGE_5VSB_LOG:
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return YM2151_PAGE_5VSB_REAL;
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}
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return -EINVAL;
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case yh5151e:
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switch (page_log) {
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case YH5151E_PAGE_12V_LOG:
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return YH5151E_PAGE_12V_REAL;
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case YH5151E_PAGE_5V_LOG:
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return YH5151E_PAGE_5V_LOG;
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case YH5151E_PAGE_3V3_LOG:
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return YH5151E_PAGE_3V3_REAL;
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}
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return -EINVAL;
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}
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return -EINVAL;
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}
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static int set_page(struct i2c_client *client, int page_log)
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{
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const struct pmbus_driver_info *info = pmbus_get_driver_info(client);
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struct fsp3y_data *data = to_fsp3y_data(info);
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int rv;
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int page_real;
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if (page_log < 0)
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return 0;
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page_real = page_log_to_page_real(page_log, data->chip);
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if (page_real < 0)
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return page_real;
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if (data->page != page_real) {
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rv = i2c_smbus_write_byte_data(client, PMBUS_PAGE, page_real);
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if (rv < 0)
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return rv;
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data->page = page_real;
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/*
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* Testing showed that the device has a timing issue. After
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* setting a page, it takes a while, before the device actually
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* gives the correct values from the correct page. 20 ms was
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* tested to be enough to not give wrong values (15 ms wasn't
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* enough).
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*/
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usleep_range(20000, 30000);
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}
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return 0;
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}
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static int fsp3y_read_byte_data(struct i2c_client *client, int page, int reg)
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{
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int rv;
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rv = set_page(client, page);
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if (rv < 0)
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return rv;
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return i2c_smbus_read_byte_data(client, reg);
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}
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static int fsp3y_read_word_data(struct i2c_client *client, int page, int phase, int reg)
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{
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int rv;
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/*
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* This masks commands which weren't tested to work correctly. Some of
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* the masked commands return 0xFFFF. These would probably get tagged as
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* invalid by pmbus_core. Other ones do return values which might be
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* useful (that is, they are not 0xFFFF), but their encoding is unknown,
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* and so they are unsupported.
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*/
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switch (reg) {
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case PMBUS_READ_FAN_SPEED_1:
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case PMBUS_READ_IIN:
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case PMBUS_READ_IOUT:
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case PMBUS_READ_PIN:
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case PMBUS_READ_POUT:
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case PMBUS_READ_TEMPERATURE_1:
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case PMBUS_READ_TEMPERATURE_2:
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case PMBUS_READ_TEMPERATURE_3:
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case PMBUS_READ_VIN:
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case PMBUS_READ_VOUT:
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case PMBUS_STATUS_WORD:
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break;
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default:
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return -ENXIO;
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}
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rv = set_page(client, page);
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if (rv < 0)
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return rv;
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return i2c_smbus_read_word_data(client, reg);
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}
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static struct pmbus_driver_info fsp3y_info[] = {
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[ym2151e] = {
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.pages = 2,
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.func[YM2151_PAGE_12V_LOG] =
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PMBUS_HAVE_VOUT | 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_VIN | PMBUS_HAVE_IIN |
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PMBUS_HAVE_FAN12,
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.func[YM2151_PAGE_5VSB_LOG] =
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PMBUS_HAVE_VOUT | PMBUS_HAVE_IOUT,
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PMBUS_HAVE_IIN,
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.read_word_data = fsp3y_read_word_data,
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.read_byte_data = fsp3y_read_byte_data,
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},
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[yh5151e] = {
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.pages = 3,
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.func[YH5151E_PAGE_12V_LOG] =
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PMBUS_HAVE_VOUT | PMBUS_HAVE_IOUT |
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PMBUS_HAVE_POUT |
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PMBUS_HAVE_TEMP | PMBUS_HAVE_TEMP2 | PMBUS_HAVE_TEMP3,
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.func[YH5151E_PAGE_5V_LOG] =
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PMBUS_HAVE_VOUT | PMBUS_HAVE_IOUT |
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PMBUS_HAVE_POUT,
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.func[YH5151E_PAGE_3V3_LOG] =
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PMBUS_HAVE_VOUT | PMBUS_HAVE_IOUT |
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PMBUS_HAVE_POUT,
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.read_word_data = fsp3y_read_word_data,
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.read_byte_data = fsp3y_read_byte_data,
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}
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};
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static int fsp3y_detect(struct i2c_client *client)
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{
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int rv;
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u8 buf[I2C_SMBUS_BLOCK_MAX + 1];
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rv = i2c_smbus_read_block_data(client, PMBUS_MFR_MODEL, buf);
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if (rv < 0)
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return rv;
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buf[rv] = '\0';
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if (rv == 8) {
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if (!strcmp(buf, "YM-2151E"))
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return ym2151e;
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else if (!strcmp(buf, "YH-5151E"))
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return yh5151e;
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}
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dev_err(&client->dev, "Unsupported model %.*s\n", rv, buf);
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return -ENODEV;
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}
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static const struct i2c_device_id fsp3y_id[] = {
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{"ym2151e", ym2151e},
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{"yh5151e", yh5151e},
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{ }
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};
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static int fsp3y_probe(struct i2c_client *client)
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{
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struct fsp3y_data *data;
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const struct i2c_device_id *id;
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int rv;
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data = devm_kzalloc(&client->dev, sizeof(struct fsp3y_data), GFP_KERNEL);
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if (!data)
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return -ENOMEM;
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data->chip = fsp3y_detect(client);
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if (data->chip < 0)
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return data->chip;
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id = i2c_match_id(fsp3y_id, client);
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if (data->chip != id->driver_data)
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dev_warn(&client->dev, "Device mismatch: Configured %s (%d), detected %d\n",
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id->name, (int)id->driver_data, data->chip);
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rv = i2c_smbus_read_byte_data(client, PMBUS_PAGE);
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if (rv < 0)
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return rv;
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data->page = rv;
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data->info = fsp3y_info[data->chip];
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return pmbus_do_probe(client, &data->info);
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}
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MODULE_DEVICE_TABLE(i2c, fsp3y_id);
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static struct i2c_driver fsp3y_driver = {
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.driver = {
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.name = "fsp3y",
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},
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.probe_new = fsp3y_probe,
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.id_table = fsp3y_id
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};
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module_i2c_driver(fsp3y_driver);
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MODULE_AUTHOR("Václav Kubernát");
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MODULE_DESCRIPTION("PMBus driver for FSP/3Y-Power power supplies");
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MODULE_LICENSE("GPL");
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