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![Wilken Gottwalt](/assets/img/avatar_default.png)
The correct fan rpm value is also a LINEAR11 value but without a factor. Verified by using the fan test button on the psu to let the fan spin up to maximum for some seconds. Fixes: 933222c98445 ("hwmon: (corsair-psu) fix unintentional sign extension issue") Signed-off-by: Wilken Gottwalt <wilken.gottwalt@posteo.net> Link: https://lore.kernel.org/r/20201113121954.GA8488@monster.powergraphx.local Signed-off-by: Guenter Roeck <linux@roeck-us.net>
600 lines
16 KiB
C
600 lines
16 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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* corsair-psu.c - Linux driver for Corsair power supplies with HID sensors interface
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* Copyright (C) 2020 Wilken Gottwalt <wilken.gottwalt@posteo.net>
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*/
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#include <linux/completion.h>
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#include <linux/debugfs.h>
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#include <linux/errno.h>
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#include <linux/hid.h>
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#include <linux/hwmon.h>
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#include <linux/hwmon-sysfs.h>
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#include <linux/jiffies.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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/*
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* Corsair protocol for PSUs
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*
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* message size = 64 bytes (request and response, little endian)
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* request:
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* [length][command][param0][param1][paramX]...
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* reply:
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* [echo of length][echo of command][data0][data1][dataX]...
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*
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* - commands are byte sized opcodes
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* - length is the sum of all bytes of the commands/params
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* - the micro-controller of most of these PSUs support concatenation in the request and reply,
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* but it is better to not rely on this (it is also hard to parse)
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* - the driver uses raw events to be accessible from userspace (though this is not really
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* supported, it is just there for convenience, may be removed in the future)
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* - a reply always start with the length and command in the same order the request used it
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* - length of the reply data is specific to the command used
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* - some of the commands work on a rail and can be switched to a specific rail (0 = 12v,
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* 1 = 5v, 2 = 3.3v)
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* - the format of the init command 0xFE is swapped length/command bytes
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* - parameter bytes amount and values are specific to the command (rail setting is the only
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* for now that uses non-zero values)
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* - there are much more commands, especially for configuring the device, but they are not
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* supported because a wrong command/length can lockup the micro-controller
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* - the driver supports debugfs for values not fitting into the hwmon class
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* - not every device class (HXi, RMi or AXi) supports all commands
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* - it is a pure sensors reading driver (will not support configuring)
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*/
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#define DRIVER_NAME "corsair-psu"
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#define REPLY_SIZE 16 /* max length of a reply to a single command */
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#define CMD_BUFFER_SIZE 64
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#define CMD_TIMEOUT_MS 250
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#define SECONDS_PER_HOUR (60 * 60)
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#define SECONDS_PER_DAY (SECONDS_PER_HOUR * 24)
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#define PSU_CMD_SELECT_RAIL 0x00 /* expects length 2 */
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#define PSU_CMD_IN_VOLTS 0x88 /* the rest of the commands expect length 3 */
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#define PSU_CMD_IN_AMPS 0x89
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#define PSU_CMD_RAIL_OUT_VOLTS 0x8B
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#define PSU_CMD_RAIL_AMPS 0x8C
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#define PSU_CMD_TEMP0 0x8D
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#define PSU_CMD_TEMP1 0x8E
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#define PSU_CMD_FAN 0x90
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#define PSU_CMD_RAIL_WATTS 0x96
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#define PSU_CMD_VEND_STR 0x99
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#define PSU_CMD_PROD_STR 0x9A
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#define PSU_CMD_TOTAL_WATTS 0xEE
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#define PSU_CMD_TOTAL_UPTIME 0xD1
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#define PSU_CMD_UPTIME 0xD2
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#define PSU_CMD_INIT 0xFE
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#define L_IN_VOLTS "v_in"
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#define L_OUT_VOLTS_12V "v_out +12v"
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#define L_OUT_VOLTS_5V "v_out +5v"
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#define L_OUT_VOLTS_3_3V "v_out +3.3v"
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#define L_IN_AMPS "curr in"
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#define L_AMPS_12V "curr +12v"
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#define L_AMPS_5V "curr +5v"
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#define L_AMPS_3_3V "curr +3.3v"
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#define L_FAN "psu fan"
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#define L_TEMP0 "vrm temp"
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#define L_TEMP1 "case temp"
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#define L_WATTS "power total"
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#define L_WATTS_12V "power +12v"
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#define L_WATTS_5V "power +5v"
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#define L_WATTS_3_3V "power +3.3v"
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static const char *const label_watts[] = {
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L_WATTS,
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L_WATTS_12V,
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L_WATTS_5V,
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L_WATTS_3_3V
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};
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static const char *const label_volts[] = {
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L_IN_VOLTS,
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L_OUT_VOLTS_12V,
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L_OUT_VOLTS_5V,
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L_OUT_VOLTS_3_3V
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};
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static const char *const label_amps[] = {
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L_IN_AMPS,
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L_AMPS_12V,
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L_AMPS_5V,
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L_AMPS_3_3V
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};
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struct corsairpsu_data {
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struct hid_device *hdev;
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struct device *hwmon_dev;
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struct dentry *debugfs;
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struct completion wait_completion;
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struct mutex lock; /* for locking access to cmd_buffer */
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u8 *cmd_buffer;
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char vendor[REPLY_SIZE];
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char product[REPLY_SIZE];
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};
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/* some values are SMBus LINEAR11 data which need a conversion */
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static int corsairpsu_linear11_to_int(const int val)
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{
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int exp = (val & 0xFFFF) >> 0x0B;
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int mant = val & 0x7FF;
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int i;
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if (exp > 0x0F)
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exp -= 0x20;
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if (mant > 0x3FF)
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mant -= 0x800;
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if ((mant & 0x01) == 1)
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++mant;
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if (exp < 0) {
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for (i = 0; i < -exp; ++i)
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mant /= 2;
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} else {
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for (i = 0; i < exp; ++i)
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mant *= 2;
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}
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return mant;
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}
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static int corsairpsu_usb_cmd(struct corsairpsu_data *priv, u8 p0, u8 p1, u8 p2, void *data)
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{
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unsigned long time;
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int ret;
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memset(priv->cmd_buffer, 0, CMD_BUFFER_SIZE);
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priv->cmd_buffer[0] = p0;
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priv->cmd_buffer[1] = p1;
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priv->cmd_buffer[2] = p2;
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reinit_completion(&priv->wait_completion);
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ret = hid_hw_output_report(priv->hdev, priv->cmd_buffer, CMD_BUFFER_SIZE);
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if (ret < 0)
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return ret;
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time = wait_for_completion_timeout(&priv->wait_completion,
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msecs_to_jiffies(CMD_TIMEOUT_MS));
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if (!time)
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return -ETIMEDOUT;
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/*
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* at the start of the reply is an echo of the send command/length in the same order it
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* was send, not every command is supported on every device class, if a command is not
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* supported, the length value in the reply is okay, but the command value is set to 0
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*/
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if (p0 != priv->cmd_buffer[0] || p1 != priv->cmd_buffer[1])
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return -EOPNOTSUPP;
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if (data)
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memcpy(data, priv->cmd_buffer + 2, REPLY_SIZE);
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return 0;
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}
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static int corsairpsu_init(struct corsairpsu_data *priv)
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{
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/*
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* PSU_CMD_INIT uses swapped length/command and expects 2 parameter bytes, this command
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* actually generates a reply, but we don't need it
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*/
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return corsairpsu_usb_cmd(priv, PSU_CMD_INIT, 3, 0, NULL);
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}
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static int corsairpsu_fwinfo(struct corsairpsu_data *priv)
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{
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int ret;
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ret = corsairpsu_usb_cmd(priv, 3, PSU_CMD_VEND_STR, 0, priv->vendor);
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if (ret < 0)
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return ret;
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ret = corsairpsu_usb_cmd(priv, 3, PSU_CMD_PROD_STR, 0, priv->product);
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if (ret < 0)
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return ret;
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return 0;
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}
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static int corsairpsu_request(struct corsairpsu_data *priv, u8 cmd, u8 rail, void *data)
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{
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int ret;
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mutex_lock(&priv->lock);
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switch (cmd) {
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case PSU_CMD_RAIL_OUT_VOLTS:
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case PSU_CMD_RAIL_AMPS:
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case PSU_CMD_RAIL_WATTS:
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ret = corsairpsu_usb_cmd(priv, 2, PSU_CMD_SELECT_RAIL, rail, NULL);
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if (ret < 0)
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goto cmd_fail;
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break;
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default:
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break;
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}
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ret = corsairpsu_usb_cmd(priv, 3, cmd, 0, data);
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cmd_fail:
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mutex_unlock(&priv->lock);
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return ret;
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}
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static int corsairpsu_get_value(struct corsairpsu_data *priv, u8 cmd, u8 rail, long *val)
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{
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u8 data[REPLY_SIZE];
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long tmp;
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int ret;
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ret = corsairpsu_request(priv, cmd, rail, data);
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if (ret < 0)
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return ret;
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/*
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* the biggest value here comes from the uptime command and to exceed MAXINT total uptime
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* needs to be about 68 years, the rest are u16 values and the biggest value coming out of
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* the LINEAR11 conversion are the watts values which are about 1200 for the strongest psu
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* supported (HX1200i)
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*/
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tmp = ((long)data[3] << 24) + (data[2] << 16) + (data[1] << 8) + data[0];
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switch (cmd) {
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case PSU_CMD_IN_VOLTS:
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case PSU_CMD_IN_AMPS:
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case PSU_CMD_RAIL_OUT_VOLTS:
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case PSU_CMD_RAIL_AMPS:
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case PSU_CMD_TEMP0:
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case PSU_CMD_TEMP1:
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*val = corsairpsu_linear11_to_int(tmp & 0xFFFF) * 1000;
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break;
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case PSU_CMD_FAN:
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*val = corsairpsu_linear11_to_int(tmp & 0xFFFF);
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break;
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case PSU_CMD_RAIL_WATTS:
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case PSU_CMD_TOTAL_WATTS:
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*val = corsairpsu_linear11_to_int(tmp & 0xFFFF) * 1000000;
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break;
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case PSU_CMD_TOTAL_UPTIME:
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case PSU_CMD_UPTIME:
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*val = tmp;
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break;
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default:
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ret = -EOPNOTSUPP;
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break;
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}
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return ret;
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}
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static umode_t corsairpsu_hwmon_ops_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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if (type == hwmon_temp && (attr == hwmon_temp_input || attr == hwmon_temp_label))
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return 0444;
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else if (type == hwmon_fan && (attr == hwmon_fan_input || attr == hwmon_fan_label))
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return 0444;
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else if (type == hwmon_power && (attr == hwmon_power_input || attr == hwmon_power_label))
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return 0444;
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else if (type == hwmon_in && (attr == hwmon_in_input || attr == hwmon_in_label))
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return 0444;
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else if (type == hwmon_curr && (attr == hwmon_curr_input || attr == hwmon_curr_label))
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return 0444;
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return 0;
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}
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static int corsairpsu_hwmon_ops_read(struct device *dev, enum hwmon_sensor_types type, u32 attr,
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int channel, long *val)
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{
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struct corsairpsu_data *priv = dev_get_drvdata(dev);
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int ret;
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if (type == hwmon_temp && attr == hwmon_temp_input && channel < 2) {
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ret = corsairpsu_get_value(priv, channel ? PSU_CMD_TEMP1 : PSU_CMD_TEMP0, channel,
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val);
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} else if (type == hwmon_fan && attr == hwmon_fan_input) {
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ret = corsairpsu_get_value(priv, PSU_CMD_FAN, 0, val);
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} else if (type == hwmon_power && attr == hwmon_power_input) {
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switch (channel) {
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case 0:
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ret = corsairpsu_get_value(priv, PSU_CMD_TOTAL_WATTS, 0, val);
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break;
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case 1 ... 3:
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ret = corsairpsu_get_value(priv, PSU_CMD_RAIL_WATTS, channel - 1, val);
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break;
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default:
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return -EOPNOTSUPP;
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}
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} else if (type == hwmon_in && attr == hwmon_in_input) {
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switch (channel) {
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case 0:
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ret = corsairpsu_get_value(priv, PSU_CMD_IN_VOLTS, 0, val);
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break;
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case 1 ... 3:
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ret = corsairpsu_get_value(priv, PSU_CMD_RAIL_OUT_VOLTS, channel - 1, val);
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break;
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default:
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return -EOPNOTSUPP;
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}
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} else if (type == hwmon_curr && attr == hwmon_curr_input) {
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switch (channel) {
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case 0:
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ret = corsairpsu_get_value(priv, PSU_CMD_IN_AMPS, 0, val);
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break;
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case 1 ... 3:
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ret = corsairpsu_get_value(priv, PSU_CMD_RAIL_AMPS, channel - 1, val);
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break;
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default:
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return -EOPNOTSUPP;
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}
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} else {
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return -EOPNOTSUPP;
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}
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if (ret < 0)
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return ret;
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return 0;
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}
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static int corsairpsu_hwmon_ops_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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if (type == hwmon_temp && attr == hwmon_temp_label) {
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*str = channel ? L_TEMP1 : L_TEMP0;
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return 0;
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} else if (type == hwmon_fan && attr == hwmon_fan_label) {
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*str = L_FAN;
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return 0;
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} else if (type == hwmon_power && attr == hwmon_power_label && channel < 4) {
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*str = label_watts[channel];
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return 0;
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} else if (type == hwmon_in && attr == hwmon_in_label && channel < 4) {
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*str = label_volts[channel];
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return 0;
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} else if (type == hwmon_curr && attr == hwmon_curr_label && channel < 4) {
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*str = label_amps[channel];
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return 0;
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}
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return -EOPNOTSUPP;
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}
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static const struct hwmon_ops corsairpsu_hwmon_ops = {
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.is_visible = corsairpsu_hwmon_ops_is_visible,
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.read = corsairpsu_hwmon_ops_read,
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.read_string = corsairpsu_hwmon_ops_read_string,
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};
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static const struct hwmon_channel_info *corsairpsu_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 | HWMON_T_LABEL,
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HWMON_T_INPUT | HWMON_T_LABEL),
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HWMON_CHANNEL_INFO(fan,
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HWMON_F_INPUT | HWMON_F_LABEL),
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HWMON_CHANNEL_INFO(power,
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HWMON_P_INPUT | HWMON_P_LABEL,
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HWMON_P_INPUT | HWMON_P_LABEL,
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HWMON_P_INPUT | HWMON_P_LABEL,
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HWMON_P_INPUT | HWMON_P_LABEL),
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HWMON_CHANNEL_INFO(in,
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HWMON_I_INPUT | HWMON_I_LABEL,
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HWMON_I_INPUT | HWMON_I_LABEL,
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HWMON_I_INPUT | HWMON_I_LABEL,
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HWMON_I_INPUT | HWMON_I_LABEL),
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HWMON_CHANNEL_INFO(curr,
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HWMON_C_INPUT | HWMON_C_LABEL,
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HWMON_C_INPUT | HWMON_C_LABEL,
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HWMON_C_INPUT | HWMON_C_LABEL,
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HWMON_C_INPUT | HWMON_C_LABEL),
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NULL
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};
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static const struct hwmon_chip_info corsairpsu_chip_info = {
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.ops = &corsairpsu_hwmon_ops,
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.info = corsairpsu_info,
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};
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#ifdef CONFIG_DEBUG_FS
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static void print_uptime(struct seq_file *seqf, u8 cmd)
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{
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struct corsairpsu_data *priv = seqf->private;
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long val;
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int ret;
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ret = corsairpsu_get_value(priv, cmd, 0, &val);
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if (ret < 0) {
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seq_puts(seqf, "N/A\n");
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return;
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}
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if (val > SECONDS_PER_DAY) {
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seq_printf(seqf, "%ld day(s), %02ld:%02ld:%02ld\n", val / SECONDS_PER_DAY,
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val % SECONDS_PER_DAY / SECONDS_PER_HOUR, val % SECONDS_PER_HOUR / 60,
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val % 60);
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return;
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}
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seq_printf(seqf, "%02ld:%02ld:%02ld\n", val % SECONDS_PER_DAY / SECONDS_PER_HOUR,
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val % SECONDS_PER_HOUR / 60, val % 60);
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}
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static int uptime_show(struct seq_file *seqf, void *unused)
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{
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print_uptime(seqf, PSU_CMD_UPTIME);
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return 0;
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}
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DEFINE_SHOW_ATTRIBUTE(uptime);
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static int uptime_total_show(struct seq_file *seqf, void *unused)
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{
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print_uptime(seqf, PSU_CMD_TOTAL_UPTIME);
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return 0;
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}
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DEFINE_SHOW_ATTRIBUTE(uptime_total);
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static int vendor_show(struct seq_file *seqf, void *unused)
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{
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struct corsairpsu_data *priv = seqf->private;
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seq_printf(seqf, "%s\n", priv->vendor);
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return 0;
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}
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DEFINE_SHOW_ATTRIBUTE(vendor);
|
|
|
|
static int product_show(struct seq_file *seqf, void *unused)
|
|
{
|
|
struct corsairpsu_data *priv = seqf->private;
|
|
|
|
seq_printf(seqf, "%s\n", priv->product);
|
|
|
|
return 0;
|
|
}
|
|
DEFINE_SHOW_ATTRIBUTE(product);
|
|
|
|
static void corsairpsu_debugfs_init(struct corsairpsu_data *priv)
|
|
{
|
|
char name[32];
|
|
|
|
scnprintf(name, sizeof(name), "%s-%s", DRIVER_NAME, dev_name(&priv->hdev->dev));
|
|
|
|
priv->debugfs = debugfs_create_dir(name, NULL);
|
|
debugfs_create_file("uptime", 0444, priv->debugfs, priv, &uptime_fops);
|
|
debugfs_create_file("uptime_total", 0444, priv->debugfs, priv, &uptime_total_fops);
|
|
debugfs_create_file("vendor", 0444, priv->debugfs, priv, &vendor_fops);
|
|
debugfs_create_file("product", 0444, priv->debugfs, priv, &product_fops);
|
|
}
|
|
|
|
#else
|
|
|
|
static void corsairpsu_debugfs_init(struct corsairpsu_data *priv)
|
|
{
|
|
}
|
|
|
|
#endif
|
|
|
|
static int corsairpsu_probe(struct hid_device *hdev, const struct hid_device_id *id)
|
|
{
|
|
struct corsairpsu_data *priv;
|
|
int ret;
|
|
|
|
priv = devm_kzalloc(&hdev->dev, sizeof(struct corsairpsu_data), GFP_KERNEL);
|
|
if (!priv)
|
|
return -ENOMEM;
|
|
|
|
priv->cmd_buffer = devm_kmalloc(&hdev->dev, CMD_BUFFER_SIZE, GFP_KERNEL);
|
|
if (!priv->cmd_buffer)
|
|
return -ENOMEM;
|
|
|
|
ret = hid_parse(hdev);
|
|
if (ret)
|
|
return ret;
|
|
|
|
ret = hid_hw_start(hdev, HID_CONNECT_HIDRAW);
|
|
if (ret)
|
|
return ret;
|
|
|
|
ret = hid_hw_open(hdev);
|
|
if (ret)
|
|
goto fail_and_stop;
|
|
|
|
priv->hdev = hdev;
|
|
hid_set_drvdata(hdev, priv);
|
|
mutex_init(&priv->lock);
|
|
init_completion(&priv->wait_completion);
|
|
|
|
hid_device_io_start(hdev);
|
|
|
|
ret = corsairpsu_init(priv);
|
|
if (ret < 0) {
|
|
dev_err(&hdev->dev, "unable to initialize device (%d)\n", ret);
|
|
goto fail_and_stop;
|
|
}
|
|
|
|
ret = corsairpsu_fwinfo(priv);
|
|
if (ret < 0) {
|
|
dev_err(&hdev->dev, "unable to query firmware (%d)\n", ret);
|
|
goto fail_and_stop;
|
|
}
|
|
|
|
priv->hwmon_dev = hwmon_device_register_with_info(&hdev->dev, "corsairpsu", priv,
|
|
&corsairpsu_chip_info, 0);
|
|
|
|
if (IS_ERR(priv->hwmon_dev)) {
|
|
ret = PTR_ERR(priv->hwmon_dev);
|
|
goto fail_and_close;
|
|
}
|
|
|
|
corsairpsu_debugfs_init(priv);
|
|
|
|
return 0;
|
|
|
|
fail_and_close:
|
|
hid_hw_close(hdev);
|
|
fail_and_stop:
|
|
hid_hw_stop(hdev);
|
|
return ret;
|
|
}
|
|
|
|
static void corsairpsu_remove(struct hid_device *hdev)
|
|
{
|
|
struct corsairpsu_data *priv = hid_get_drvdata(hdev);
|
|
|
|
debugfs_remove_recursive(priv->debugfs);
|
|
hwmon_device_unregister(priv->hwmon_dev);
|
|
hid_hw_close(hdev);
|
|
hid_hw_stop(hdev);
|
|
}
|
|
|
|
static int corsairpsu_raw_event(struct hid_device *hdev, struct hid_report *report, u8 *data,
|
|
int size)
|
|
{
|
|
struct corsairpsu_data *priv = hid_get_drvdata(hdev);
|
|
|
|
if (completion_done(&priv->wait_completion))
|
|
return 0;
|
|
|
|
memcpy(priv->cmd_buffer, data, min(CMD_BUFFER_SIZE, size));
|
|
complete(&priv->wait_completion);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static const struct hid_device_id corsairpsu_idtable[] = {
|
|
{ HID_USB_DEVICE(0x1b1c, 0x1c03) }, /* Corsair HX550i */
|
|
{ HID_USB_DEVICE(0x1b1c, 0x1c04) }, /* Corsair HX650i */
|
|
{ HID_USB_DEVICE(0x1b1c, 0x1c05) }, /* Corsair HX750i */
|
|
{ HID_USB_DEVICE(0x1b1c, 0x1c06) }, /* Corsair HX850i */
|
|
{ HID_USB_DEVICE(0x1b1c, 0x1c07) }, /* Corsair HX1000i */
|
|
{ HID_USB_DEVICE(0x1b1c, 0x1c08) }, /* Corsair HX1200i */
|
|
{ HID_USB_DEVICE(0x1b1c, 0x1c09) }, /* Corsair RM550i */
|
|
{ HID_USB_DEVICE(0x1b1c, 0x1c0a) }, /* Corsair RM650i */
|
|
{ HID_USB_DEVICE(0x1b1c, 0x1c0b) }, /* Corsair RM750i */
|
|
{ HID_USB_DEVICE(0x1b1c, 0x1c0c) }, /* Corsair RM850i */
|
|
{ HID_USB_DEVICE(0x1b1c, 0x1c0d) }, /* Corsair RM1000i */
|
|
{ },
|
|
};
|
|
MODULE_DEVICE_TABLE(hid, corsairpsu_idtable);
|
|
|
|
static struct hid_driver corsairpsu_driver = {
|
|
.name = DRIVER_NAME,
|
|
.id_table = corsairpsu_idtable,
|
|
.probe = corsairpsu_probe,
|
|
.remove = corsairpsu_remove,
|
|
.raw_event = corsairpsu_raw_event,
|
|
};
|
|
module_hid_driver(corsairpsu_driver);
|
|
|
|
MODULE_LICENSE("GPL");
|
|
MODULE_AUTHOR("Wilken Gottwalt <wilken.gottwalt@posteo.net>");
|
|
MODULE_DESCRIPTION("Linux driver for Corsair power supplies with HID sensors interface");
|