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hwmon: add POWER-Z driver

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POWER-Z is a series of devices to monitor power characteristics of
USB-C connections and display those on a on-device display.
Some of the devices, notably KM002C and KM003C, contain an additional
port which exposes the measurements via USB.

This is a driver for this monitor port.

It was developed and tested with the KM003C.

Signed-off-by: Thomas Weißschuh <linux@weissschuh.net>
Link: https://lore.kernel.org/r/20230902-powerz-v4-1-7ec2c1440687@weissschuh.net
[groeck:
 Release urb after hwmon registration error;
 Move priv->status initialization to correct place before reinit_completion
 ]
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
This commit is contained in:
Thomas Weißschuh 2023-09-02 09:47:01 +02:00 committed by Guenter Roeck
parent 9da2901c47
commit 4381a36abd
6 changed files with 323 additions and 0 deletions
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1
Documentation/hwmon/index.rst
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@ -178,6 +178,7 @@ Hardware Monitoring Kernel Drivers
peci-cputemp
peci-dimmtemp
pmbus
powerz
powr1220
pxe1610
pwm-fan

30
Documentation/hwmon/powerz.rst Normal file
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@ -0,0 +1,30 @@
.. SPDX-License-Identifier: GPL-2.0-or-later
Kernel driver POWERZ
====================
Supported chips:
* ChargerLAB POWER-Z KM003C
Prefix: 'powerz'
Addresses scanned: -
Author:
- Thomas Weißschuh <linux@weissschuh.net>
Description
-----------
This driver implements support for the ChargerLAB POWER-Z USB-C power testing
family.
The device communicates with the custom protocol over USB.
The channel labels exposed via hwmon match the labels used by the on-device
display and the official POWER-Z PC software.
As current can flow in both directions through the tester the sign of the
channel "curr1_input" (label "IBUS") indicates the direction.

7
MAINTAINERS
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@ -4794,6 +4794,13 @@ X: drivers/char/ipmi/
X: drivers/char/random.c
X: drivers/char/tpm/
CHARGERLAB POWER-Z HARDWARE MONITOR DRIVER
M: Thomas Weißschuh <linux@weissschuh.net>
L: linux-hwmon@vger.kernel.org
S: Maintained
F: Documentation/hwmon/powerz.rst
F: drivers/hwmon/powerz.c
CHECKPATCH
M: Andy Whitcroft <apw@canonical.com>
M: Joe Perches <joe@perches.com>

10
drivers/hwmon/Kconfig
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@ -839,6 +839,16 @@ config SENSORS_JC42
This driver can also be built as a module. If so, the module
will be called jc42.
config SENSORS_POWERZ
tristate "ChargerLAB POWER-Z USB-C tester"
depends on USB
help
If you say yes here you get support for ChargerLAB POWER-Z series of
USB-C charging testers.
This driver can also be built as a module. If so, the module
will be called powerz.
config SENSORS_POWR1220
tristate "Lattice POWR1220 Power Monitoring"
depends on I2C

1
drivers/hwmon/Makefile
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@ -176,6 +176,7 @@ obj-$(CONFIG_SENSORS_OXP) += oxp-sensors.o
obj-$(CONFIG_SENSORS_PC87360) += pc87360.o
obj-$(CONFIG_SENSORS_PC87427) += pc87427.o
obj-$(CONFIG_SENSORS_PCF8591) += pcf8591.o
obj-$(CONFIG_SENSORS_POWERZ) += powerz.o
obj-$(CONFIG_SENSORS_POWR1220) += powr1220.o
obj-$(CONFIG_SENSORS_PWM_FAN) += pwm-fan.o
obj-$(CONFIG_SENSORS_RASPBERRYPI_HWMON) += raspberrypi-hwmon.o

274
drivers/hwmon/powerz.c Normal file
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@ -0,0 +1,274 @@
// SPDX-License-Identifier: GPL-2.0-only
/*
* Copyright (C) 2023 Thomas Weißschuh <linux@weissschuh.net>
*/
#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
#include <linux/completion.h>
#include <linux/device.h>
#include <linux/hwmon.h>
#include <linux/module.h>
#include <linux/mutex.h>
#include <linux/types.h>
#include <linux/usb.h>
#define DRIVER_NAME "powerz"
#define POWERZ_EP_CMD_OUT 0x01
#define POWERZ_EP_DATA_IN 0x81
struct powerz_sensor_data {
u8 _unknown_1[8];
__le32 V_bus;
__le32 I_bus;
__le32 V_bus_avg;
__le32 I_bus_avg;
u8 _unknown_2[8];
u8 temp[2];
__le16 V_cc1;
__le16 V_cc2;
__le16 V_dp;
__le16 V_dm;
__le16 V_dd;
u8 _unknown_3[4];
} __packed;
struct powerz_priv {
char transfer_buffer[64]; /* first member to satisfy DMA alignment */
struct mutex mutex;
struct completion completion;
struct urb *urb;
int status;
};
static const struct hwmon_channel_info *const powerz_info[] = {
HWMON_CHANNEL_INFO(in,
HWMON_I_INPUT | HWMON_I_LABEL | HWMON_I_AVERAGE,
HWMON_I_INPUT | HWMON_I_LABEL,
HWMON_I_INPUT | HWMON_I_LABEL,
HWMON_I_INPUT | HWMON_I_LABEL,
HWMON_I_INPUT | HWMON_I_LABEL,
HWMON_I_INPUT | HWMON_I_LABEL),
HWMON_CHANNEL_INFO(curr,
HWMON_C_INPUT | HWMON_C_LABEL | HWMON_C_AVERAGE),
HWMON_CHANNEL_INFO(temp, HWMON_T_INPUT | HWMON_T_LABEL),
NULL
};
static umode_t powerz_is_visible(const void *data, enum hwmon_sensor_types type,
u32 attr, int channel)
{
return 0444;
}
static int powerz_read_string(struct device *dev, enum hwmon_sensor_types type,
u32 attr, int channel, const char **str)
{
if (type == hwmon_curr && attr == hwmon_curr_label) {
*str = "IBUS";
} else if (type == hwmon_in && attr == hwmon_in_label) {
if (channel == 0)
*str = "VBUS";
else if (channel == 1)
*str = "VCC1";
else if (channel == 2)
*str = "VCC2";
else if (channel == 3)
*str = "VDP";
else if (channel == 4)
*str = "VDM";
else if (channel == 5)
*str = "VDD";
else
return -EOPNOTSUPP;
} else if (type == hwmon_temp && attr == hwmon_temp_label) {
*str = "TEMP";
} else {
return -EOPNOTSUPP;
}
return 0;
}
static void powerz_usb_data_complete(struct urb *urb)
{
struct powerz_priv *priv = urb->context;
complete(&priv->completion);
}
static void powerz_usb_cmd_complete(struct urb *urb)
{
struct powerz_priv *priv = urb->context;
usb_fill_bulk_urb(urb, urb->dev,
usb_rcvbulkpipe(urb->dev, POWERZ_EP_DATA_IN),
priv->transfer_buffer, sizeof(priv->transfer_buffer),
powerz_usb_data_complete, priv);
priv->status = usb_submit_urb(urb, GFP_ATOMIC);
if (priv->status)
complete(&priv->completion);
}
static int powerz_read_data(struct usb_device *udev, struct powerz_priv *priv)
{
int ret;
priv->status = -ETIMEDOUT;
reinit_completion(&priv->completion);
priv->transfer_buffer[0] = 0x0c;
priv->transfer_buffer[1] = 0x00;
priv->transfer_buffer[2] = 0x02;
priv->transfer_buffer[3] = 0x00;
usb_fill_bulk_urb(priv->urb, udev,
usb_sndbulkpipe(udev, POWERZ_EP_CMD_OUT),
priv->transfer_buffer, 4, powerz_usb_cmd_complete,
priv);
ret = usb_submit_urb(priv->urb, GFP_KERNEL);
if (ret)
return ret;
if (!wait_for_completion_interruptible_timeout
(&priv->completion, msecs_to_jiffies(5))) {
usb_kill_urb(priv->urb);
return -EIO;
}
if (priv->urb->actual_length < sizeof(struct powerz_sensor_data))
return -EIO;
return priv->status;
}
static int powerz_read(struct device *dev, enum hwmon_sensor_types type,
u32 attr, int channel, long *val)
{
struct usb_interface *intf = to_usb_interface(dev->parent);
struct usb_device *udev = interface_to_usbdev(intf);
struct powerz_priv *priv = usb_get_intfdata(intf);
struct powerz_sensor_data *data;
int ret;
if (!priv)
return -EIO; /* disconnected */
mutex_lock(&priv->mutex);
ret = powerz_read_data(udev, priv);
if (ret)
goto out;
data = (struct powerz_sensor_data *)priv->transfer_buffer;
if (type == hwmon_curr) {
if (attr == hwmon_curr_input)
*val = ((s32)le32_to_cpu(data->I_bus)) / 1000;
else if (attr == hwmon_curr_average)
*val = ((s32)le32_to_cpu(data->I_bus_avg)) / 1000;
else
ret = -EOPNOTSUPP;
} else if (type == hwmon_in) {
if (attr == hwmon_in_input) {
if (channel == 0)
*val = le32_to_cpu(data->V_bus) / 1000;
else if (channel == 1)
*val = le16_to_cpu(data->V_cc1) / 10;
else if (channel == 2)
*val = le16_to_cpu(data->V_cc2) / 10;
else if (channel == 3)
*val = le16_to_cpu(data->V_dp) / 10;
else if (channel == 4)
*val = le16_to_cpu(data->V_dm) / 10;
else if (channel == 5)
*val = le16_to_cpu(data->V_dd) / 10;
else
ret = -EOPNOTSUPP;
} else if (attr == hwmon_in_average && channel == 0) {
*val = le32_to_cpu(data->V_bus_avg) / 1000;
} else {
ret = -EOPNOTSUPP;
}
} else if (type == hwmon_temp && attr == hwmon_temp_input) {
*val = data->temp[1] * 2000 + data->temp[0] * 1000 / 128;
} else {
ret = -EOPNOTSUPP;
}
out:
mutex_unlock(&priv->mutex);
return ret;
}
static const struct hwmon_ops powerz_hwmon_ops = {
.is_visible = powerz_is_visible,
.read = powerz_read,
.read_string = powerz_read_string,
};
static const struct hwmon_chip_info powerz_chip_info = {
.ops = &powerz_hwmon_ops,
.info = powerz_info,
};
static int powerz_probe(struct usb_interface *intf,
const struct usb_device_id *id)
{
struct powerz_priv *priv;
struct device *hwmon_dev;
struct device *parent;
parent = &intf->dev;
priv = devm_kzalloc(parent, sizeof(*priv), GFP_KERNEL);
if (!priv)
return -ENOMEM;
priv->urb = usb_alloc_urb(0, GFP_KERNEL);
if (!priv->urb)
return -ENOMEM;
mutex_init(&priv->mutex);
init_completion(&priv->completion);
hwmon_dev =
devm_hwmon_device_register_with_info(parent, DRIVER_NAME, priv,
&powerz_chip_info, NULL);
if (IS_ERR(hwmon_dev)) {
usb_free_urb(priv->urb);
return PTR_ERR(hwmon_dev);
}
usb_set_intfdata(intf, priv);
return 0;
}
static void powerz_disconnect(struct usb_interface *intf)
{
struct powerz_priv *priv = usb_get_intfdata(intf);
mutex_lock(&priv->mutex);
usb_kill_urb(priv->urb);
usb_free_urb(priv->urb);
mutex_unlock(&priv->mutex);
}
static const struct usb_device_id powerz_id_table[] = {
{ USB_DEVICE_INTERFACE_NUMBER(0x5FC9, 0x0063, 0x00) }, /* ChargerLAB POWER-Z KM003C */
{ }
};
MODULE_DEVICE_TABLE(usb, powerz_id_table);
static struct usb_driver powerz_driver = {
.name = DRIVER_NAME,
.id_table = powerz_id_table,
.probe = powerz_probe,
.disconnect = powerz_disconnect,
};
module_usb_driver(powerz_driver);
MODULE_LICENSE("GPL");
MODULE_AUTHOR("Thomas Weißschuh <linux@weissschuh.net>");
MODULE_DESCRIPTION("ChargerLAB POWER-Z USB-C tester");