This adds the possibility for reading pwm values. These can not be read if the device is controlled via fan_target or a fan curve and will return an error in this case. Since an error is expected, this adds some rudimentary error handling.
Changes: - add CTL_GET_FAN_PWM and use it via get_data - pwm returns -ENODATA if the device returns error 0x12 - fan_target now returns -ENODATA when the driver is started or a pwm value is set. - add ccp_get_errno to determine errno from device error. - get_data now has a parameter to determine whether to read one or two bytes of data. - update documentation - fix missing surname in MAINTAINERS Signed-off-by: Marius Zachmann <[email protected]> --- Documentation/hwmon/corsair-cpro.rst | 7 ++- MAINTAINERS | 2 +- drivers/hwmon/corsair-cpro.c | 64 +++++++++++++++++++--------- 3 files changed, 48 insertions(+), 25 deletions(-) diff --git a/Documentation/hwmon/corsair-cpro.rst b/Documentation/hwmon/corsair-cpro.rst index 78820156f07d..751f95476b57 100644 --- a/Documentation/hwmon/corsair-cpro.rst +++ b/Documentation/hwmon/corsair-cpro.rst @@ -35,8 +35,7 @@ fan[1-6]_input Connected fan rpm. fan[1-6]_label Shows fan type as detected by the device. fan[1-6]_target Sets fan speed target rpm. When reading, it reports the last value if it was set by the driver. - Otherwise returns 0. -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. + Otherwise returns an error. +pwm[1-6] Sets the fan speed. Values from 0-255. Can only be read if pwm + was set directly. ======================= ===================================================================== diff --git a/MAINTAINERS b/MAINTAINERS index 06607125b793..a93aefab91f1 100644 --- a/MAINTAINERS +++ b/MAINTAINERS @@ -4402,7 +4402,7 @@ F: Documentation/hwmon/coretemp.rst F: drivers/hwmon/coretemp.c CORSAIR-CPRO HARDWARE MONITOR DRIVER -M: Marius <[email protected]> +M: Marius Zachmann <[email protected]> L: [email protected] S: Maintained F: drivers/hwmon/corsair-cpro.c diff --git a/drivers/hwmon/corsair-cpro.c b/drivers/hwmon/corsair-cpro.c index e8504267d0e8..591929ec217a 100644 --- a/drivers/hwmon/corsair-cpro.c +++ b/drivers/hwmon/corsair-cpro.c @@ -36,11 +36,12 @@ * send: byte 1 is channel, rest zero * rcv: returns temp for channel in centi-degree celsius * in bytes 1 and 2 - * returns 17 in byte 0 if no sensor is connected + * returns 0x11 in byte 0 if no sensor is connected */ #define CTL_GET_VOLT 0x12 /* * send: byte 1 is rail number: 0 = 12v, 1 = 5v, 2 = 3.3v * rcv: returns millivolt in bytes 1,2 + * returns error 0x10 if request is invalid */ #define CTL_GET_FAN_CNCT 0x20 /* * returns in bytes 1-6 for each fan: @@ -52,6 +53,12 @@ * send: byte 1 is channel, rest zero * rcv: returns rpm in bytes 1,2 */ +#define CTL_GET_FAN_PWM 0x22 /* + * send: byte 1 is channel, rest zero + * rcv: returns pwm in byte 1 if it was set + * returns error 0x12 if fan is controlled via + * fan_target or fan curve + */ #define CTL_SET_FAN_FPWM 0x23 /* * set fixed pwm * send: byte 1 is fan number @@ -73,13 +80,31 @@ struct ccp_device { struct completion wait_input_report; struct mutex mutex; /* whenever buffer is used, lock before send_usb_cmd */ u8 *buffer; - int pwm[6]; int target[6]; DECLARE_BITMAP(temp_cnct, NUM_TEMP_SENSORS); DECLARE_BITMAP(fan_cnct, NUM_FANS); char fan_label[6][LABEL_LENGTH]; }; +/* converts response error in buffer to errno */ +static int ccp_get_errno(struct ccp_device *ccp) +{ + switch (ccp->buffer[0]) { + case 0x00: /* success */ + return 0; + case 0x01: /* called invalid command */ + return -EOPNOTSUPP; + case 0x10: /* called GET_VOLT / GET_TMP with invalid arguments */ + return -EINVAL; + case 0x11: /* requested temps of disconnected sensors */ + case 0x12: /* requested pwm of not pwm controlled channels */ + return -ENODATA; + default: + hid_dbg(ccp->hdev, "unknown device response error: %d", ccp->buffer[0]); + return -EIO; + } +} + /* send command, check for error in response, response in ccp->buffer */ static int send_usb_cmd(struct ccp_device *ccp, u8 command, u8 byte1, u8 byte2, u8 byte3) { @@ -102,13 +127,7 @@ static int send_usb_cmd(struct ccp_device *ccp, u8 command, u8 byte1, u8 byte2, if (!t) return -ETIMEDOUT; - /* first byte of response is error code */ - if (ccp->buffer[0] != 0x00) { - hid_dbg(ccp->hdev, "device response error: %d", ccp->buffer[0]); - return -EIO; - } - - return 0; + return ccp_get_errno(ccp); } static int ccp_raw_event(struct hid_device *hdev, struct hid_report *report, u8 *data, int size) @@ -126,7 +145,7 @@ static int ccp_raw_event(struct hid_device *hdev, struct hid_report *report, u8 } /* requests and returns single data values depending on channel */ -static int get_data(struct ccp_device *ccp, int command, int channel) +static int get_data(struct ccp_device *ccp, int command, int channel, bool two_byte_data) { int ret; @@ -136,7 +155,9 @@ static int get_data(struct ccp_device *ccp, int command, int channel) if (ret) goto out_unlock; - ret = (ccp->buffer[1] << 8) + ccp->buffer[2]; + ret = ccp->buffer[1]; + if (two_byte_data) + ret = (ret << 8) + ccp->buffer[2]; out_unlock: mutex_unlock(&ccp->mutex); @@ -150,14 +171,14 @@ static int set_pwm(struct ccp_device *ccp, int channel, long val) 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); ret = send_usb_cmd(ccp, CTL_SET_FAN_FPWM, channel, val, 0); + if (!ret) + ccp->target[channel] = -ENODATA; mutex_unlock(&ccp->mutex); return ret; @@ -171,7 +192,6 @@ static int set_target(struct ccp_device *ccp, int channel, long val) ccp->target[channel] = val; mutex_lock(&ccp->mutex); - ret = send_usb_cmd(ccp, CTL_SET_FAN_TARGET, channel, val >> 8, val); mutex_unlock(&ccp->mutex); @@ -210,7 +230,7 @@ static int ccp_read(struct device *dev, enum hwmon_sensor_types type, case hwmon_temp: switch (attr) { case hwmon_temp_input: - ret = get_data(ccp, CTL_GET_TMP, channel); + ret = get_data(ccp, CTL_GET_TMP, channel, true); if (ret < 0) return ret; *val = ret * 10; @@ -222,7 +242,7 @@ static int ccp_read(struct device *dev, enum hwmon_sensor_types type, case hwmon_fan: switch (attr) { case hwmon_fan_input: - ret = get_data(ccp, CTL_GET_FAN_RPM, channel); + ret = get_data(ccp, CTL_GET_FAN_RPM, channel, true); if (ret < 0) return ret; *val = ret; @@ -230,6 +250,8 @@ static int ccp_read(struct device *dev, enum hwmon_sensor_types type, case hwmon_fan_target: /* how to read target values from the device is unknown */ /* driver returns last set value or 0 */ + if (ccp->target[channel] < 0) + return -ENODATA; *val = ccp->target[channel]; return 0; default: @@ -239,9 +261,10 @@ static int ccp_read(struct device *dev, enum hwmon_sensor_types type, 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]; + ret = get_data(ccp, CTL_GET_FAN_PWM, channel, false); + if (ret < 0) + return ret; + *val = DIV_ROUND_CLOSEST(ret * 255, 100); return 0; default: break; @@ -250,7 +273,7 @@ static int ccp_read(struct device *dev, enum hwmon_sensor_types type, case hwmon_in: switch (attr) { case hwmon_in_input: - ret = get_data(ccp, CTL_GET_VOLT, channel); + ret = get_data(ccp, CTL_GET_VOLT, channel, true); if (ret < 0) return ret; *val = ret; @@ -416,6 +439,7 @@ static int get_fan_cnct(struct ccp_device *ccp) continue; set_bit(channel, ccp->fan_cnct); + ccp->target[channel] = -ENODATA; switch (mode) { case 1: -- 2.27.0
