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Subject[RFC v2] hwmon: add Corsair Commander Pro driver
Date
This is a driver for the Corsair Commander Pro.
It provides sysfs attributes for:
- Reading fan speed
- Reading temp sensors
- Reading voltage values
- Writing pwm and reading last written pwm

Changed it to a USB driver for a couple of reasons.
Still need to add it to the hid_ignore_list in hid-quirks.c

Signed-off-by: Marius Zachmann <mail@mariuszachmann.de>
---

Changes from v1:
- Style issues
- Changed to USB driver
- Clarify reading pwm in Documentation and code
- Fixed attribute name number in Documentation
- MODULE_LICENSE now "GPL"
- Removed unneccesary hwmondev in ccp_device
- Moved buffer to ccp_device and mutex out of send_usb_cmd
- No more replacing or ignoring error codes
- Use DIV_ROUND_CLOSEST in set_pwm
- Changed fan_label when unknown to "fanX other"
- Only accept 0 or 1 for fan_enable
- Check for ERR_PTR in ccp_probe
---
Documentation/hwmon/corsair-cpro.rst | 43 +++
MAINTAINERS | 6 +
drivers/hwmon/Kconfig | 10 +
drivers/hwmon/Makefile | 1 +
drivers/hwmon/corsair-cpro.c | 451 +++++++++++++++++++++++++++
5 files changed, 511 insertions(+)
create mode 100644 Documentation/hwmon/corsair-cpro.rst
create mode 100644 drivers/hwmon/corsair-cpro.c

diff --git a/Documentation/hwmon/corsair-cpro.rst b/Documentation/hwmon/corsair-cpro.rst
new file mode 100644
index 000000000000..57de8f4d630b
--- /dev/null
+++ b/Documentation/hwmon/corsair-cpro.rst
@@ -0,0 +1,43 @@
+Kernel driver corsair-cpro
+==========================
+
+Supported devices:
+
+ * Corsair Commander Pro
+ * Corsair Commander Pro (1000D)
+
+Author: Marius Zachmann
+
+Description
+-----------
+
+This driver implements the sysfs interface for the Corsair Commander Pro.
+The Corsair Commander Pro is a USB device with 6 fan connectors,
+4 temperature sensor connectors and 2 Corsair LED connectors.
+It can read the voltage levels on the SATA power connector.
+
+Usage Notes
+-----------
+
+Since it is a USB device, hotswapping is possible. The device is autodetected.
+
+Sysfs entries
+-------------
+
+in0_input Voltage on SATA 12v
+in1_input Voltage on SATA 5v
+in2_input Voltage on SATA 3.3v
+
+temp[1-4]_input Connected temperature sensors
+
+fan[1-6]_input Connected fan rpm.
+fan[1-6]_label Shows connection status of the fan as detected by the
+ device.
+ "fanX nc" no connection
+ "fanX 3pin" 3-pin fan detected
+ "fanX 4pin" 4-pin fan detected
+fan[1-6]_enable the driver only reports fan speeds when 1
+
+pwm[1-6] Sets the fan speed. Values from 0-255.
+ When reading, it reports the last value if it was set by the driver.
+ Otherwise returns 0.
diff --git a/MAINTAINERS b/MAINTAINERS
index f08f290df174..169530c7eede 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -4386,6 +4386,12 @@ S: Maintained
F: Documentation/hwmon/coretemp.rst
F: drivers/hwmon/coretemp.c

+CORSAIR-CPRO HARDWARE MONITOR DRIVER
+M: Marius Zachmann <mail@mariuszachmann.de>
+L: linux-hwmon@vger.kernel.org
+S: Maintained
+F: drivers/hwmon/corsair-cpro.c
+
COSA/SRP SYNC SERIAL DRIVER
M: Jan "Yenya" Kasprzak <kas@fi.muni.cz>
S: Maintained
diff --git a/drivers/hwmon/Kconfig b/drivers/hwmon/Kconfig
index 288ae9f63588..8b046a5dfa40 100644
--- a/drivers/hwmon/Kconfig
+++ b/drivers/hwmon/Kconfig
@@ -439,6 +439,16 @@ config SENSORS_BT1_PVT_ALARMS
the data conversion will be periodically performed and the data will be
saved in the internal driver cache.

+config SENSORS_CORSAIR_CPRO
+ tristate "Corsair Commander Pro controller"
+ depends on USB
+ help
+ If you say yes here you get support for the Corsair Commander Pro
+ controller.
+
+ This driver can also be built as a module. If so, the module
+ will be called corsair-cpro.
+
config SENSORS_DRIVETEMP
tristate "Hard disk drives with temperature sensors"
depends on SCSI && ATA
diff --git a/drivers/hwmon/Makefile b/drivers/hwmon/Makefile
index 3e32c21f5efe..18e1ef74ade7 100644
--- a/drivers/hwmon/Makefile
+++ b/drivers/hwmon/Makefile
@@ -56,6 +56,7 @@ obj-$(CONFIG_SENSORS_ATXP1) += atxp1.o
obj-$(CONFIG_SENSORS_AXI_FAN_CONTROL) += axi-fan-control.o
obj-$(CONFIG_SENSORS_BT1_PVT) += bt1-pvt.o
obj-$(CONFIG_SENSORS_CORETEMP) += coretemp.o
+obj-$(CONFIG_SENSORS_CORSAIR_CPRO) += corsair-cpro.o
obj-$(CONFIG_SENSORS_DA9052_ADC)+= da9052-hwmon.o
obj-$(CONFIG_SENSORS_DA9055)+= da9055-hwmon.o
obj-$(CONFIG_SENSORS_DELL_SMM) += dell-smm-hwmon.o
diff --git a/drivers/hwmon/corsair-cpro.c b/drivers/hwmon/corsair-cpro.c
new file mode 100644
index 000000000000..f7a4d80239c2
--- /dev/null
+++ b/drivers/hwmon/corsair-cpro.c
@@ -0,0 +1,451 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * corsair-cpro.c - Linux driver for Corsair Commander Pro
+ * Copyright (C) 2020 Marius Zachmann <mail@mariuszachmann.de>
+ */
+
+#include <linux/kernel.h>
+#include <linux/hwmon.h>
+#include <linux/mutex.h>
+#include <linux/module.h>
+#include <linux/slab.h>
+#include <linux/usb.h>
+
+#define USB_VENDOR_ID_CORSAIR 0x1b1c
+#define USB_PRODUCT_ID_CORSAIR_COMMANDERPRO 0x0c10
+#define USB_PRODUCT_ID_CORSAIR_1000D 0x1d00
+
+#define OUT_BUFFER_SIZE 63
+#define IN_BUFFER_SIZE 16
+#define LABEL_LENGTH 11
+
+#define CTL_GET_TMP 0x11 /* send: byte 1 is channel, rest zero */
+ /* rcv: returns temp for channel in bytes 1 and 2 */
+#define CTL_GET_VOLT 0x12 /* send: byte 1 = rail number 12, 5, 3.3 */
+ /* rcv: returns volt in bytes 1,2 */
+#define CTL_GET_FAN_CNCT 0x20 /* returns in bytes 1-6 */
+ /* 0 for no connect */
+ /* 1 for 3pin, 2 for 4pin */
+#define CTL_GET_FAN_RPM 0x21 /* works like CTL_GET_TMP */
+#define CTL_SET_FAN_FPWM 0x23 /* send: byte 1 is fan number */
+ /* send: byte 2 is percentage from 0 - 100 */
+
+struct ccp_device {
+ struct usb_device *udev;
+ struct mutex mutex; /* whenever buffer is used or usb calls are made */
+ u8 *buffer;
+ int pwm[6];
+ int fan_enable[6];
+ char fan_label[6][LABEL_LENGTH];
+};
+
+/* send 63 byte buffer and receive response in same buffer */
+static int send_usb_cmd(struct ccp_device *ccp)
+{
+ int ret;
+ int actual_length;
+
+ ret = usb_bulk_msg(ccp->udev, usb_sndintpipe(ccp->udev, 2), ccp->buffer, OUT_BUFFER_SIZE,
+ &actual_length, 1000);
+ if (ret) {
+ dev_err(&ccp->udev->dev, "usb_bulk_msg send failed: %d", ret);
+ return ret;
+ }
+
+ ret = usb_bulk_msg(ccp->udev, usb_rcvintpipe(ccp->udev, 1), ccp->buffer, IN_BUFFER_SIZE,
+ &actual_length, 1000);
+ if (ret) {
+ dev_err(&ccp->udev->dev, "usb_bulk_msg receive failed: %d", ret);
+ return ret;
+ }
+
+ return 0;
+}
+
+/* for commands, which return just a number depending on a channel: */
+/* get_temp, get_volt, get_fan_rpm */
+static int get_data(struct ccp_device *ccp, int command, int channel, long *val)
+{
+ int ret;
+
+ mutex_lock(&ccp->mutex);
+
+ memset(ccp->buffer, 0x00, OUT_BUFFER_SIZE);
+ ccp->buffer[0] = command;
+ ccp->buffer[1] = channel;
+ ret = send_usb_cmd(ccp);
+ if (ret)
+ goto exit;
+
+ *val = (ccp->buffer[1] << 8) + ccp->buffer[2];
+
+exit:
+ mutex_unlock(&ccp->mutex);
+ return ret;
+}
+
+static int set_pwm(struct ccp_device *ccp, int channel, long val)
+{
+ int ret;
+
+ if (val < 0 || val > 255)
+ return -EINVAL;
+
+ ccp->pwm[channel] = val;
+
+ /* The Corsair Commander Pro uses values from 0-100 */
+ val = DIV_ROUND_CLOSEST(val * 100, 255);
+
+ mutex_lock(&ccp->mutex);
+
+ memset(ccp->buffer, 0x00, OUT_BUFFER_SIZE);
+ ccp->buffer[0] = CTL_SET_FAN_FPWM;
+ ccp->buffer[1] = channel;
+ ccp->buffer[2] = val;
+ ret = send_usb_cmd(ccp);
+
+ mutex_unlock(&ccp->mutex);
+ return ret;
+}
+
+static int get_fan_mode_label(struct ccp_device *ccp, int channel)
+{
+ int ret;
+ int mode;
+
+ mutex_lock(&ccp->mutex);
+
+ memset(ccp->buffer, 0x00, OUT_BUFFER_SIZE);
+ ccp->buffer[0] = CTL_GET_FAN_CNCT;
+ ret = send_usb_cmd(ccp);
+ if (ret)
+ goto exit;
+
+ mode = ccp->buffer[channel + 1];
+
+ switch (mode) {
+ case 0:
+ scnprintf(ccp->fan_label[channel], LABEL_LENGTH, "fan%d nc", channel + 1);
+ break;
+ case 1:
+ scnprintf(ccp->fan_label[channel], LABEL_LENGTH, "fan%d 3pin", channel + 1);
+ break;
+ case 2:
+ scnprintf(ccp->fan_label[channel], LABEL_LENGTH, "fan%d 4pin", channel + 1);
+ break;
+ default:
+ scnprintf(ccp->fan_label[channel], LABEL_LENGTH, "fan%d other", channel + 1);
+ break;
+ }
+
+exit:
+ mutex_unlock(&ccp->mutex);
+ return ret;
+}
+
+static int get_voltage(struct ccp_device *ccp, int channel, long *val)
+{
+ int ret;
+
+ ret = get_data(ccp, CTL_GET_VOLT, channel, val);
+
+ return ret;
+}
+
+static int get_temp(struct ccp_device *ccp, int channel, long *val)
+{
+ int ret;
+
+ ret = get_data(ccp, CTL_GET_TMP, channel, val);
+ *val = *val * 10;
+
+ return ret;
+}
+
+static int get_rpm(struct ccp_device *ccp, int channel, long *val)
+{
+ int ret;
+
+ if (!ccp->fan_enable[channel])
+ return -ENODATA;
+
+ ret = get_data(ccp, CTL_GET_FAN_RPM, channel, val);
+
+ return ret;
+}
+
+static int ccp_read_string(struct device *dev, enum hwmon_sensor_types type,
+ u32 attr, int channel, const char **str)
+{
+ int ret;
+ struct ccp_device *ccp = dev_get_drvdata(dev);
+
+ switch (type) {
+ case hwmon_fan:
+ switch (attr) {
+ case hwmon_fan_label:
+ ret = get_fan_mode_label(ccp, channel);
+ if (ret == 0)
+ *str = ccp->fan_label[channel];
+ break;
+ default:
+ ret = -EOPNOTSUPP;
+ break;
+ }
+ break;
+ default:
+ ret = -EOPNOTSUPP;
+ break;
+ }
+
+ return ret;
+}
+
+static int ccp_read(struct device *dev, enum hwmon_sensor_types type,
+ u32 attr, int channel, long *val)
+{
+ int ret = 0;
+ struct ccp_device *ccp = dev_get_drvdata(dev);
+
+ switch (type) {
+ case hwmon_temp:
+ switch (attr) {
+ case hwmon_temp_input:
+ ret = get_temp(ccp, channel, val);
+ break;
+ default:
+ ret = -EOPNOTSUPP;
+ break;
+ }
+ break;
+ case hwmon_fan:
+ switch (attr) {
+ case hwmon_fan_input:
+ ret = get_rpm(ccp, channel, val);
+ break;
+ case hwmon_fan_enable:
+ *val = ccp->fan_enable[channel];
+ break;
+ default:
+ ret = -EOPNOTSUPP;
+ break;
+ }
+ break;
+ case hwmon_pwm:
+ switch (attr) {
+ case hwmon_pwm_input:
+ /* how to read pwm values from the device is currently unknown */
+ /* driver returns last set value or 0 */
+ *val = ccp->pwm[channel];
+ break;
+ default:
+ ret = -EOPNOTSUPP;
+ break;
+ }
+ break;
+ case hwmon_in:
+ switch (attr) {
+ case hwmon_in_input:
+ ret = get_voltage(ccp, channel, val);
+ break;
+ default:
+ ret = -EOPNOTSUPP;
+ break;
+ }
+ break;
+ default:
+ ret = -EOPNOTSUPP;
+ break;
+ }
+
+ return ret;
+};
+
+static int ccp_write(struct device *dev, enum hwmon_sensor_types type,
+ u32 attr, int channel, long val)
+{
+ int ret = 0;
+ struct ccp_device *ccp = dev_get_drvdata(dev);
+
+ switch (type) {
+ case hwmon_fan:
+ switch (attr) {
+ case hwmon_fan_enable:
+ if (val == 0 || val == 1)
+ ccp->fan_enable[channel] = val;
+ else
+ ret = -EINVAL;
+ break;
+ default:
+ ret = -EOPNOTSUPP;
+ break;
+ }
+ break;
+ case hwmon_pwm:
+ switch (attr) {
+ case hwmon_pwm_input:
+ ret = set_pwm(ccp, channel, val);
+ break;
+ default:
+ ret = -EOPNOTSUPP;
+ break;
+ }
+ break;
+ default:
+ ret = -EOPNOTSUPP;
+ break;
+ }
+
+ return ret;
+};
+
+static umode_t ccp_is_visible(const void *data, enum hwmon_sensor_types type,
+ u32 attr, int channel)
+{
+ switch (type) {
+ case hwmon_chip:
+ switch (attr) {
+ case hwmon_chip_update_interval:
+ return 0644;
+ default:
+ break;
+ }
+ break;
+ case hwmon_temp:
+ switch (attr) {
+ case hwmon_temp_input:
+ return 0444;
+ default:
+ break;
+ }
+ break;
+ case hwmon_fan:
+ switch (attr) {
+ case hwmon_fan_input:
+ return 0444;
+ case hwmon_fan_label:
+ return 0444;
+ case hwmon_fan_enable:
+ return 0644;
+ default:
+ break;
+ }
+ break;
+ case hwmon_pwm:
+ switch (attr) {
+ case hwmon_pwm_input:
+ return 0644;
+ default:
+ break;
+ }
+ break;
+ case hwmon_in:
+ switch (attr) {
+ case hwmon_in_input:
+ return 0444;
+ default:
+ break;
+ }
+ break;
+ default:
+ break;
+ }
+
+ return 0;
+};
+
+static const struct hwmon_ops ccp_hwmon_ops = {
+ .is_visible = ccp_is_visible,
+ .read = ccp_read,
+ .write = ccp_write,
+ .read_string = ccp_read_string,
+};
+
+static const struct hwmon_channel_info *ccp_info[] = {
+ HWMON_CHANNEL_INFO(chip,
+ HWMON_C_REGISTER_TZ | HWMON_C_UPDATE_INTERVAL),
+ HWMON_CHANNEL_INFO(temp,
+ HWMON_T_INPUT | HWMON_T_MAX,
+ HWMON_T_INPUT | HWMON_T_MAX,
+ HWMON_T_INPUT | HWMON_T_MAX,
+ HWMON_T_INPUT | HWMON_T_MAX
+ ),
+ HWMON_CHANNEL_INFO(fan,
+ HWMON_F_INPUT | HWMON_F_ENABLE | HWMON_F_LABEL,
+ HWMON_F_INPUT | HWMON_F_ENABLE | HWMON_F_LABEL,
+ HWMON_F_INPUT | HWMON_F_ENABLE | HWMON_F_LABEL,
+ HWMON_F_INPUT | HWMON_F_ENABLE | HWMON_F_LABEL,
+ HWMON_F_INPUT | HWMON_F_ENABLE | HWMON_F_LABEL,
+ HWMON_F_INPUT | HWMON_F_ENABLE | HWMON_F_LABEL
+ ),
+ HWMON_CHANNEL_INFO(pwm,
+ HWMON_PWM_INPUT,
+ HWMON_PWM_INPUT,
+ HWMON_PWM_INPUT,
+ HWMON_PWM_INPUT,
+ HWMON_PWM_INPUT,
+ HWMON_PWM_INPUT
+ ),
+ HWMON_CHANNEL_INFO(in,
+ HWMON_I_INPUT,
+ HWMON_I_INPUT,
+ HWMON_I_INPUT
+ ),
+ NULL
+};
+
+static const struct hwmon_chip_info ccp_chip_info = {
+ .ops = &ccp_hwmon_ops,
+ .info = ccp_info,
+};
+
+static int ccp_probe(struct usb_interface *intf, const struct usb_device_id *id)
+{
+ struct ccp_device *ccp;
+ struct device *hwmon_dev;
+
+ ccp = devm_kzalloc(&intf->dev, sizeof(struct ccp_device), GFP_KERNEL);
+ if (!ccp)
+ return -ENOMEM;
+
+ ccp->buffer = devm_kmalloc(&intf->dev, OUT_BUFFER_SIZE, GFP_KERNEL);
+ if (!ccp->buffer)
+ return -ENOMEM;
+
+ mutex_init(&ccp->mutex);
+
+ ccp->fan_enable[0] = 1;
+ ccp->fan_enable[1] = 1;
+ ccp->fan_enable[2] = 1;
+ ccp->fan_enable[3] = 1;
+ ccp->fan_enable[4] = 1;
+ ccp->fan_enable[5] = 1;
+ ccp->udev = interface_to_usbdev(intf);
+
+ hwmon_dev = devm_hwmon_device_register_with_info(&intf->dev, "corsaircpro", ccp,
+ &ccp_chip_info, 0);
+
+ return PTR_ERR_OR_ZERO(hwmon_dev);
+}
+
+void ccp_disconnect(struct usb_interface *intf)
+{
+}
+
+static const struct usb_device_id ccp_devices[] = {
+ { USB_DEVICE(USB_VENDOR_ID_CORSAIR, USB_PRODUCT_ID_CORSAIR_COMMANDERPRO) },
+ { USB_DEVICE(USB_VENDOR_ID_CORSAIR, USB_PRODUCT_ID_CORSAIR_1000D) },
+ { }
+};
+
+static struct usb_driver ccp_driver = {
+ .name = "corsair-cpro",
+ .id_table = ccp_devices,
+ .probe = ccp_probe,
+ .disconnect = ccp_disconnect
+};
+
+MODULE_DEVICE_TABLE(usb, ccp_devices);
+MODULE_LICENSE("GPL");
+
+module_usb_driver(ccp_driver);
--
2.27.0


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