584 lines
12 KiB
C
584 lines
12 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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* corsair-cpro.c - Linux driver for Corsair Commander Pro
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* Copyright (C) 2020 Marius Zachmann <mail@mariuszachmann.de>
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*
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* This driver uses hid reports to communicate with the device to allow hidraw userspace drivers
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* still being used. The device does not use report ids. When using hidraw and this driver
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* simultaniously, reports could be switched.
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*/
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#include <linux/bitops.h>
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#include <linux/completion.h>
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#include <linux/hid.h>
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#include <linux/hwmon.h>
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/mutex.h>
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#include <linux/slab.h>
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#include <linux/types.h>
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#define USB_VENDOR_ID_CORSAIR 0x1b1c
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#define USB_PRODUCT_ID_CORSAIR_COMMANDERPRO 0x0c10
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#define USB_PRODUCT_ID_CORSAIR_1000D 0x1d00
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#define OUT_BUFFER_SIZE 63
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#define IN_BUFFER_SIZE 16
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#define LABEL_LENGTH 11
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#define REQ_TIMEOUT 300
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#define CTL_GET_TMP_CNCT 0x10 /*
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* returns in bytes 1-4 for each temp sensor:
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* 0 not connected
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* 1 connected
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*/
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#define CTL_GET_TMP 0x11 /*
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* send: byte 1 is channel, rest zero
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* rcv: returns temp for channel in centi-degree celsius
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* in bytes 1 and 2
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* returns 0x11 in byte 0 if no sensor is connected
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*/
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#define CTL_GET_VOLT 0x12 /*
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* send: byte 1 is rail number: 0 = 12v, 1 = 5v, 2 = 3.3v
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* rcv: returns millivolt in bytes 1,2
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* returns error 0x10 if request is invalid
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*/
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#define CTL_GET_FAN_CNCT 0x20 /*
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* returns in bytes 1-6 for each fan:
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* 0 not connected
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* 1 3pin
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* 2 4pin
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*/
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#define CTL_GET_FAN_RPM 0x21 /*
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* send: byte 1 is channel, rest zero
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* rcv: returns rpm in bytes 1,2
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*/
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#define CTL_GET_FAN_PWM 0x22 /*
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* send: byte 1 is channel, rest zero
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* rcv: returns pwm in byte 1 if it was set
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* returns error 0x12 if fan is controlled via
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* fan_target or fan curve
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*/
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#define CTL_SET_FAN_FPWM 0x23 /*
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* set fixed pwm
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* send: byte 1 is fan number
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* send: byte 2 is percentage from 0 - 100
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*/
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#define CTL_SET_FAN_TARGET 0x24 /*
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* set target rpm
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* send: byte 1 is fan number
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* send: byte 2-3 is target
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* device accepts all values from 0x00 - 0xFFFF
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*/
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#define NUM_FANS 6
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#define NUM_TEMP_SENSORS 4
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struct ccp_device {
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struct hid_device *hdev;
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struct device *hwmon_dev;
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struct completion wait_input_report;
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struct mutex mutex; /* whenever buffer is used, lock before send_usb_cmd */
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u8 *buffer;
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int target[6];
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DECLARE_BITMAP(temp_cnct, NUM_TEMP_SENSORS);
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DECLARE_BITMAP(fan_cnct, NUM_FANS);
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char fan_label[6][LABEL_LENGTH];
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};
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/* converts response error in buffer to errno */
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static int ccp_get_errno(struct ccp_device *ccp)
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{
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switch (ccp->buffer[0]) {
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case 0x00: /* success */
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return 0;
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case 0x01: /* called invalid command */
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return -EOPNOTSUPP;
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case 0x10: /* called GET_VOLT / GET_TMP with invalid arguments */
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return -EINVAL;
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case 0x11: /* requested temps of disconnected sensors */
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case 0x12: /* requested pwm of not pwm controlled channels */
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return -ENODATA;
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default:
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hid_dbg(ccp->hdev, "unknown device response error: %d", ccp->buffer[0]);
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return -EIO;
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}
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}
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/* send command, check for error in response, response in ccp->buffer */
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static int send_usb_cmd(struct ccp_device *ccp, u8 command, u8 byte1, u8 byte2, u8 byte3)
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{
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unsigned long t;
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int ret;
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memset(ccp->buffer, 0x00, OUT_BUFFER_SIZE);
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ccp->buffer[0] = command;
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ccp->buffer[1] = byte1;
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ccp->buffer[2] = byte2;
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ccp->buffer[3] = byte3;
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reinit_completion(&ccp->wait_input_report);
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ret = hid_hw_output_report(ccp->hdev, ccp->buffer, OUT_BUFFER_SIZE);
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if (ret < 0)
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return ret;
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t = wait_for_completion_timeout(&ccp->wait_input_report, msecs_to_jiffies(REQ_TIMEOUT));
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if (!t)
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return -ETIMEDOUT;
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return ccp_get_errno(ccp);
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}
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static int ccp_raw_event(struct hid_device *hdev, struct hid_report *report, u8 *data, int size)
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{
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struct ccp_device *ccp = hid_get_drvdata(hdev);
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/* only copy buffer when requested */
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if (completion_done(&ccp->wait_input_report))
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return 0;
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memcpy(ccp->buffer, data, min(IN_BUFFER_SIZE, size));
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complete(&ccp->wait_input_report);
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return 0;
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}
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/* requests and returns single data values depending on channel */
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static int get_data(struct ccp_device *ccp, int command, int channel, bool two_byte_data)
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{
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int ret;
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mutex_lock(&ccp->mutex);
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ret = send_usb_cmd(ccp, command, channel, 0, 0);
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if (ret)
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goto out_unlock;
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ret = ccp->buffer[1];
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if (two_byte_data)
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ret = (ret << 8) + ccp->buffer[2];
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out_unlock:
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mutex_unlock(&ccp->mutex);
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return ret;
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}
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static int set_pwm(struct ccp_device *ccp, int channel, long val)
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{
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int ret;
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if (val < 0 || val > 255)
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return -EINVAL;
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/* The Corsair Commander Pro uses values from 0-100 */
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val = DIV_ROUND_CLOSEST(val * 100, 255);
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mutex_lock(&ccp->mutex);
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ret = send_usb_cmd(ccp, CTL_SET_FAN_FPWM, channel, val, 0);
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if (!ret)
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ccp->target[channel] = -ENODATA;
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mutex_unlock(&ccp->mutex);
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return ret;
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}
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static int set_target(struct ccp_device *ccp, int channel, long val)
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{
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int ret;
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val = clamp_val(val, 0, 0xFFFF);
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ccp->target[channel] = val;
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mutex_lock(&ccp->mutex);
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ret = send_usb_cmd(ccp, CTL_SET_FAN_TARGET, channel, val >> 8, val);
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mutex_unlock(&ccp->mutex);
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return ret;
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}
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static int ccp_read_string(struct device *dev, enum hwmon_sensor_types type,
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u32 attr, int channel, const char **str)
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{
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struct ccp_device *ccp = dev_get_drvdata(dev);
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switch (type) {
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case hwmon_fan:
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switch (attr) {
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case hwmon_fan_label:
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*str = ccp->fan_label[channel];
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return 0;
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default:
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break;
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}
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break;
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default:
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break;
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}
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return -EOPNOTSUPP;
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}
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static int ccp_read(struct device *dev, enum hwmon_sensor_types type,
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u32 attr, int channel, long *val)
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{
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struct ccp_device *ccp = dev_get_drvdata(dev);
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int ret;
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switch (type) {
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case hwmon_temp:
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switch (attr) {
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case hwmon_temp_input:
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ret = get_data(ccp, CTL_GET_TMP, channel, true);
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if (ret < 0)
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return ret;
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*val = ret * 10;
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return 0;
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default:
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break;
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}
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break;
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case hwmon_fan:
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switch (attr) {
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case hwmon_fan_input:
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ret = get_data(ccp, CTL_GET_FAN_RPM, channel, true);
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if (ret < 0)
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return ret;
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*val = ret;
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return 0;
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case hwmon_fan_target:
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/* how to read target values from the device is unknown */
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/* driver returns last set value or 0 */
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if (ccp->target[channel] < 0)
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return -ENODATA;
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*val = ccp->target[channel];
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return 0;
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default:
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break;
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}
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break;
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case hwmon_pwm:
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switch (attr) {
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case hwmon_pwm_input:
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ret = get_data(ccp, CTL_GET_FAN_PWM, channel, false);
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if (ret < 0)
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return ret;
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*val = DIV_ROUND_CLOSEST(ret * 255, 100);
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return 0;
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default:
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break;
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}
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break;
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case hwmon_in:
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switch (attr) {
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case hwmon_in_input:
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ret = get_data(ccp, CTL_GET_VOLT, channel, true);
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if (ret < 0)
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return ret;
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*val = ret;
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return 0;
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default:
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break;
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}
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break;
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default:
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break;
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}
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return -EOPNOTSUPP;
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};
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static int ccp_write(struct device *dev, enum hwmon_sensor_types type,
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u32 attr, int channel, long val)
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{
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struct ccp_device *ccp = dev_get_drvdata(dev);
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switch (type) {
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case hwmon_pwm:
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switch (attr) {
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case hwmon_pwm_input:
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return set_pwm(ccp, channel, val);
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default:
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break;
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}
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break;
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case hwmon_fan:
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switch (attr) {
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case hwmon_fan_target:
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return set_target(ccp, channel, val);
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default:
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break;
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}
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break;
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default:
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break;
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}
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return -EOPNOTSUPP;
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};
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static umode_t ccp_is_visible(const void *data, enum hwmon_sensor_types type,
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u32 attr, int channel)
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{
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const struct ccp_device *ccp = data;
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switch (type) {
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case hwmon_temp:
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if (!test_bit(channel, ccp->temp_cnct))
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break;
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switch (attr) {
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case hwmon_temp_input:
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return 0444;
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case hwmon_temp_label:
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return 0444;
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default:
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break;
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}
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break;
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case hwmon_fan:
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if (!test_bit(channel, ccp->fan_cnct))
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break;
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switch (attr) {
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case hwmon_fan_input:
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return 0444;
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case hwmon_fan_label:
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return 0444;
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case hwmon_fan_target:
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return 0644;
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default:
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break;
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}
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break;
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case hwmon_pwm:
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if (!test_bit(channel, ccp->fan_cnct))
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break;
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switch (attr) {
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case hwmon_pwm_input:
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return 0644;
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default:
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break;
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}
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break;
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case hwmon_in:
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switch (attr) {
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case hwmon_in_input:
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return 0444;
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default:
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break;
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}
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break;
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default:
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break;
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}
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return 0;
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};
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static const struct hwmon_ops ccp_hwmon_ops = {
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.is_visible = ccp_is_visible,
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.read = ccp_read,
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.read_string = ccp_read_string,
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.write = ccp_write,
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};
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static const struct hwmon_channel_info *ccp_info[] = {
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HWMON_CHANNEL_INFO(chip,
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HWMON_C_REGISTER_TZ),
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HWMON_CHANNEL_INFO(temp,
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HWMON_T_INPUT,
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HWMON_T_INPUT,
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HWMON_T_INPUT,
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HWMON_T_INPUT
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),
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HWMON_CHANNEL_INFO(fan,
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HWMON_F_INPUT | HWMON_F_LABEL | HWMON_F_TARGET,
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HWMON_F_INPUT | HWMON_F_LABEL | HWMON_F_TARGET,
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HWMON_F_INPUT | HWMON_F_LABEL | HWMON_F_TARGET,
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HWMON_F_INPUT | HWMON_F_LABEL | HWMON_F_TARGET,
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HWMON_F_INPUT | HWMON_F_LABEL | HWMON_F_TARGET,
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HWMON_F_INPUT | HWMON_F_LABEL | HWMON_F_TARGET
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),
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HWMON_CHANNEL_INFO(pwm,
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HWMON_PWM_INPUT,
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HWMON_PWM_INPUT,
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HWMON_PWM_INPUT,
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HWMON_PWM_INPUT,
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HWMON_PWM_INPUT,
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HWMON_PWM_INPUT
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),
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HWMON_CHANNEL_INFO(in,
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HWMON_I_INPUT,
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HWMON_I_INPUT,
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HWMON_I_INPUT
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),
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NULL
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};
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static const struct hwmon_chip_info ccp_chip_info = {
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.ops = &ccp_hwmon_ops,
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.info = ccp_info,
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};
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/* read fan connection status and set labels */
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static int get_fan_cnct(struct ccp_device *ccp)
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{
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int channel;
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int mode;
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int ret;
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ret = send_usb_cmd(ccp, CTL_GET_FAN_CNCT, 0, 0, 0);
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if (ret)
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return ret;
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for (channel = 0; channel < NUM_FANS; channel++) {
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mode = ccp->buffer[channel + 1];
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if (mode == 0)
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continue;
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set_bit(channel, ccp->fan_cnct);
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ccp->target[channel] = -ENODATA;
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switch (mode) {
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case 1:
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scnprintf(ccp->fan_label[channel], LABEL_LENGTH,
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"fan%d 3pin", channel + 1);
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break;
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case 2:
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scnprintf(ccp->fan_label[channel], LABEL_LENGTH,
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"fan%d 4pin", channel + 1);
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break;
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default:
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scnprintf(ccp->fan_label[channel], LABEL_LENGTH,
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"fan%d other", channel + 1);
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break;
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}
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}
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return 0;
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}
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/* read temp sensor connection status */
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static int get_temp_cnct(struct ccp_device *ccp)
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{
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int channel;
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int mode;
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int ret;
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ret = send_usb_cmd(ccp, CTL_GET_TMP_CNCT, 0, 0, 0);
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if (ret)
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return ret;
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for (channel = 0; channel < NUM_TEMP_SENSORS; channel++) {
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mode = ccp->buffer[channel + 1];
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if (mode == 0)
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continue;
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set_bit(channel, ccp->temp_cnct);
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}
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return 0;
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}
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static int ccp_probe(struct hid_device *hdev, const struct hid_device_id *id)
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{
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struct ccp_device *ccp;
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int ret;
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ccp = devm_kzalloc(&hdev->dev, sizeof(*ccp), GFP_KERNEL);
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if (!ccp)
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return -ENOMEM;
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ccp->buffer = devm_kmalloc(&hdev->dev, OUT_BUFFER_SIZE, GFP_KERNEL);
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if (!ccp->buffer)
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return -ENOMEM;
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ret = hid_parse(hdev);
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if (ret)
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return ret;
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ret = hid_hw_start(hdev, HID_CONNECT_HIDRAW);
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if (ret)
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return ret;
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ret = hid_hw_open(hdev);
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if (ret)
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goto out_hw_stop;
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ccp->hdev = hdev;
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hid_set_drvdata(hdev, ccp);
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mutex_init(&ccp->mutex);
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init_completion(&ccp->wait_input_report);
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hid_device_io_start(hdev);
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/* temp and fan connection status only updates when device is powered on */
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ret = get_temp_cnct(ccp);
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if (ret)
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goto out_hw_close;
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ret = get_fan_cnct(ccp);
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if (ret)
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goto out_hw_close;
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ccp->hwmon_dev = hwmon_device_register_with_info(&hdev->dev, "corsaircpro",
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ccp, &ccp_chip_info, 0);
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if (IS_ERR(ccp->hwmon_dev)) {
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ret = PTR_ERR(ccp->hwmon_dev);
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goto out_hw_close;
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}
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return 0;
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out_hw_close:
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hid_hw_close(hdev);
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out_hw_stop:
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hid_hw_stop(hdev);
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return ret;
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}
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static void ccp_remove(struct hid_device *hdev)
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{
|
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struct ccp_device *ccp = hid_get_drvdata(hdev);
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|
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hwmon_device_unregister(ccp->hwmon_dev);
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hid_hw_close(hdev);
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hid_hw_stop(hdev);
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}
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|
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static const struct hid_device_id ccp_devices[] = {
|
|
{ HID_USB_DEVICE(USB_VENDOR_ID_CORSAIR, USB_PRODUCT_ID_CORSAIR_COMMANDERPRO) },
|
|
{ HID_USB_DEVICE(USB_VENDOR_ID_CORSAIR, USB_PRODUCT_ID_CORSAIR_1000D) },
|
|
{ }
|
|
};
|
|
|
|
static struct hid_driver ccp_driver = {
|
|
.name = "corsair-cpro",
|
|
.id_table = ccp_devices,
|
|
.probe = ccp_probe,
|
|
.remove = ccp_remove,
|
|
.raw_event = ccp_raw_event,
|
|
};
|
|
|
|
MODULE_DEVICE_TABLE(hid, ccp_devices);
|
|
MODULE_LICENSE("GPL");
|
|
|
|
static int __init ccp_init(void)
|
|
{
|
|
return hid_register_driver(&ccp_driver);
|
|
}
|
|
|
|
static void __exit ccp_exit(void)
|
|
{
|
|
hid_unregister_driver(&ccp_driver);
|
|
}
|
|
|
|
/*
|
|
* When compiling this driver as built-in, hwmon initcalls will get called before the
|
|
* hid driver and this driver would fail to register. late_initcall solves this.
|
|
*/
|
|
late_initcall(ccp_init);
|
|
module_exit(ccp_exit);
|