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hwmon: (corsair-cpro) add reading pwm values
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 <mail@mariuszachmann.de> Signed-off-by: Guenter Roeck <linux@roeck-us.net>
This commit is contained in:
Marius Zachmann
Guenter Roeck
parent
e4922176e1
commit
fa4dac3e1b
@ -35,8 +35,7 @@ fan[1-6]_input Connected fan rpm.
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fan[1-6]_label Shows fan type as detected by the device.
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fan[1-6]_target Sets fan speed target rpm.
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When reading, it reports the last value if it was set by the driver.
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Otherwise returns 0.
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pwm[1-6] Sets the fan speed. Values from 0-255.
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When reading, it reports the last value if it was set by the driver.
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Otherwise returns 0.
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Otherwise returns an error.
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pwm[1-6] Sets the fan speed. Values from 0-255. Can only be read if pwm
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was set directly.
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======================= =====================================================================
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@ -4402,7 +4402,7 @@ F: Documentation/hwmon/coretemp.rst
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F: drivers/hwmon/coretemp.c
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CORSAIR-CPRO HARDWARE MONITOR DRIVER
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M: Marius <mail@mariuszachmann.de>
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M: Marius Zachmann <mail@mariuszachmann.de>
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L: linux-hwmon@vger.kernel.org
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S: Maintained
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F: drivers/hwmon/corsair-cpro.c
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@ -36,11 +36,12 @@
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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 17 in byte 0 if no sensor is connected
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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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@ -52,6 +53,12 @@
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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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@ -73,13 +80,31 @@ struct ccp_device {
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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 pwm[6];
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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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@ -102,13 +127,7 @@ static int send_usb_cmd(struct ccp_device *ccp, u8 command, u8 byte1, u8 byte2,
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if (!t)
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return -ETIMEDOUT;
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/* first byte of response is error code */
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if (ccp->buffer[0] != 0x00) {
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hid_dbg(ccp->hdev, "device response error: %d", ccp->buffer[0]);
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return -EIO;
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}
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return 0;
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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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@ -126,7 +145,7 @@ static int ccp_raw_event(struct hid_device *hdev, struct hid_report *report, u8
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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)
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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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@ -136,7 +155,9 @@ static int get_data(struct ccp_device *ccp, int command, int channel)
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if (ret)
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goto out_unlock;
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ret = (ccp->buffer[1] << 8) + ccp->buffer[2];
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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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@ -150,14 +171,14 @@ static int set_pwm(struct ccp_device *ccp, int channel, long val)
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if (val < 0 || val > 255)
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return -EINVAL;
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ccp->pwm[channel] = val;
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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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@ -171,7 +192,6 @@ static int set_target(struct ccp_device *ccp, int channel, long val)
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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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@ -210,7 +230,7 @@ static int ccp_read(struct device *dev, enum hwmon_sensor_types 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);
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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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@ -222,7 +242,7 @@ static int ccp_read(struct device *dev, enum hwmon_sensor_types type,
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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);
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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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@ -230,6 +250,8 @@ static int ccp_read(struct device *dev, enum hwmon_sensor_types type,
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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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@ -239,9 +261,10 @@ static int ccp_read(struct device *dev, enum hwmon_sensor_types 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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/* how to read pwm values from the device is currently unknown */
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/* driver returns last set value or 0 */
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*val = ccp->pwm[channel];
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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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@ -250,7 +273,7 @@ static int ccp_read(struct device *dev, enum hwmon_sensor_types type,
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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);
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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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@ -416,6 +439,7 @@ static int get_fan_cnct(struct ccp_device *ccp)
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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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