@@ -94,6 +94,7 @@ MODULE_PARM_DESC(disable_tap_to_click,
#define HIDPP_CAPABILITY_HIDPP20_HI_RES_WHEEL BIT(7)
#define HIDPP_CAPABILITY_HIDPP20_HI_RES_SCROLL BIT(8)
#define HIDPP_CAPABILITY_HIDPP10_FAST_SCROLL BIT(9)
+#define HIDPP_CAPABILITY_ADC_MEASUREMENT BIT(10)
#define lg_map_key_clear(c) hid_map_usage_clear(hi, usage, bit, max, EV_KEY, (c))
@@ -145,6 +146,7 @@ struct hidpp_battery {
u8 feature_index;
u8 solar_feature_index;
u8 voltage_feature_index;
+ u8 adc_measurement_feature_index;
struct power_supply_desc desc;
struct power_supply *ps;
char name[64];
@@ -1742,6 +1744,162 @@ static int hidpp_set_wireless_feature_index(struct hidpp_device *hidpp)
return ret;
}
+/* -------------------------------------------------------------------------- */
+/* 0x1f20: ADC measurement */
+/* -------------------------------------------------------------------------- */
+
+#define HIDPP_PAGE_ADC_MEASUREMENT 0x1f20
+
+#define CMD_ADC_MEASUREMENT_GET_ADC_MEASUREMENT 0x00
+
+#define EVENT_ADC_MEASUREMENT_STATUS_BROADCAST 0x00
+
+static int hidpp20_map_adc_measurement_1f20_capacity(struct hid_device *hid_dev, int voltage)
+{
+ /* NB: This voltage curve doesn't necessarily map perfectly to all
+ * devices that implement the ADC_MEASUREMENT feature. This is because
+ * there are a few devices that use different battery technology.
+ *
+ * Adapted from:
+ * https://github.com/Sapd/HeadsetControl/blob/acd972be0468e039b93aae81221f20a54d2d60f7/src/devices/logitech_g633_g933_935.c#L44-L52
+ */
+ static const int voltages[100] = {
+ 4030, 4024, 4018, 4011, 4003, 3994, 3985, 3975, 3963, 3951,
+ 3937, 3922, 3907, 3893, 3880, 3868, 3857, 3846, 3837, 3828,
+ 3820, 3812, 3805, 3798, 3791, 3785, 3779, 3773, 3768, 3762,
+ 3757, 3752, 3747, 3742, 3738, 3733, 3729, 3724, 3720, 3716,
+ 3712, 3708, 3704, 3700, 3696, 3692, 3688, 3685, 3681, 3677,
+ 3674, 3670, 3667, 3663, 3660, 3657, 3653, 3650, 3646, 3643,
+ 3640, 3637, 3633, 3630, 3627, 3624, 3620, 3617, 3614, 3611,
+ 3608, 3604, 3601, 3598, 3595, 3592, 3589, 3585, 3582, 3579,
+ 3576, 3573, 3569, 3566, 3563, 3560, 3556, 3553, 3550, 3546,
+ 3543, 3539, 3536, 3532, 3529, 3525, 3499, 3466, 3433, 3399,
+ };
+
+ int i;
+
+ if (voltage == 0)
+ return 0;
+
+ if (unlikely(voltage < 3400 || voltage >= 5000))
+ hid_warn_once(hid_dev,
+ "%s: possibly using the wrong voltage curve\n",
+ __func__);
+
+ for (i = 0; i < ARRAY_SIZE(voltages); i++) {
+ if (voltage >= voltages[i])
+ return ARRAY_SIZE(voltages) - i;
+ }
+
+ return 0;
+}
+
+static int hidpp20_map_adc_measurement_1f20(u8 data[3], int *voltage)
+{
+ int status;
+ u8 flags;
+
+ flags = data[2];
+
+ switch (flags) {
+ case 0x01:
+ status = POWER_SUPPLY_STATUS_DISCHARGING;
+ break;
+ case 0x03:
+ status = POWER_SUPPLY_STATUS_CHARGING;
+ break;
+ case 0x07:
+ status = POWER_SUPPLY_STATUS_FULL;
+ break;
+ case 0x0F:
+ default:
+ status = POWER_SUPPLY_STATUS_UNKNOWN;
+ break;
+ }
+
+ *voltage = get_unaligned_be16(data);
+
+ dbg_hid("Parsed 1f20 data as flag 0x%02x voltage %dmV\n",
+ flags, *voltage);
+
+ return status;
+}
+
+/* Return value is whether the device is online */
+static bool hidpp20_get_adc_measurement_1f20(struct hidpp_device *hidpp,
+ u8 feature_index,
+ int *status, int *voltage)
+{
+ struct hidpp_report response;
+ int ret;
+ u8 *params = (u8 *)response.fap.params;
+
+ *status = POWER_SUPPLY_STATUS_UNKNOWN;
+ *voltage = 0;
+ ret = hidpp_send_fap_command_sync(hidpp, feature_index,
+ CMD_ADC_MEASUREMENT_GET_ADC_MEASUREMENT,
+ NULL, 0, &response);
+
+ if (ret > 0) {
+ hid_dbg(hidpp->hid_dev, "%s: received protocol error 0x%02x\n",
+ __func__, ret);
+ return false;
+ }
+
+ *status = hidpp20_map_adc_measurement_1f20(params, voltage);
+ return true;
+}
+
+static int hidpp20_query_adc_measurement_info_1f20(struct hidpp_device *hidpp)
+{
+ u8 feature_type;
+
+ if (hidpp->battery.adc_measurement_feature_index == 0xff) {
+ int ret;
+
+ ret = hidpp_root_get_feature(hidpp, HIDPP_PAGE_ADC_MEASUREMENT,
+ &hidpp->battery.adc_measurement_feature_index,
+ &feature_type);
+ if (ret)
+ return ret;
+
+ hidpp->capabilities |= HIDPP_CAPABILITY_ADC_MEASUREMENT;
+ }
+
+ hidpp->battery.online = hidpp20_get_adc_measurement_1f20(hidpp,
+ hidpp->battery.adc_measurement_feature_index,
+ &hidpp->battery.status,
+ &hidpp->battery.voltage);
+ hidpp->battery.capacity = hidpp20_map_adc_measurement_1f20_capacity(hidpp->hid_dev,
+ hidpp->battery.voltage);
+
+ return 0;
+}
+
+static int hidpp20_adc_measurement_event_1f20(struct hidpp_device *hidpp,
+ u8 *data, int size)
+{
+ struct hidpp_report *report = (struct hidpp_report *)data;
+ int status, voltage;
+
+ if (report->fap.feature_index != hidpp->battery.adc_measurement_feature_index ||
+ report->fap.funcindex_clientid != EVENT_ADC_MEASUREMENT_STATUS_BROADCAST)
+ return 0;
+
+ status = hidpp20_map_adc_measurement_1f20(report->fap.params, &voltage);
+
+ hidpp->battery.online = status != POWER_SUPPLY_STATUS_UNKNOWN;
+
+ if (voltage != hidpp->battery.voltage || status != hidpp->battery.status) {
+ hidpp->battery.status = status;
+ hidpp->battery.voltage = voltage;
+ hidpp->battery.capacity = hidpp20_map_adc_measurement_1f20_capacity(hidpp->hid_dev, voltage);
+ if (hidpp->battery.ps)
+ power_supply_changed(hidpp->battery.ps);
+ }
+ return 0;
+}
+
/* -------------------------------------------------------------------------- */
/* 0x2120: Hi-resolution scrolling */
/* -------------------------------------------------------------------------- */
@@ -3660,6 +3818,9 @@ static int hidpp_raw_hidpp_event(struct hidpp_device *hidpp, u8 *data,
ret = hidpp20_battery_voltage_event(hidpp, data, size);
if (ret != 0)
return ret;
+ ret = hidpp20_adc_measurement_event_1f20(hidpp, data, size);
+ if (ret != 0)
+ return ret;
}
if (hidpp->capabilities & HIDPP_CAPABILITY_HIDPP10_BATTERY) {
@@ -3783,6 +3944,7 @@ static int hidpp_initialize_battery(struct hidpp_device *hidpp)
hidpp->battery.feature_index = 0xff;
hidpp->battery.solar_feature_index = 0xff;
hidpp->battery.voltage_feature_index = 0xff;
+ hidpp->battery.adc_measurement_feature_index = 0xff;
if (hidpp->protocol_major >= 2) {
if (hidpp->quirks & HIDPP_QUIRK_CLASS_K750)
@@ -3796,6 +3958,8 @@ static int hidpp_initialize_battery(struct hidpp_device *hidpp)
ret = hidpp20_query_battery_info_1004(hidpp);
if (ret)
ret = hidpp20_query_battery_voltage_info(hidpp);
+ if (ret)
+ ret = hidpp20_query_adc_measurement_info_1f20(hidpp);
}
if (ret)
@@ -3825,7 +3989,8 @@ static int hidpp_initialize_battery(struct hidpp_device *hidpp)
if (hidpp->capabilities & HIDPP_CAPABILITY_BATTERY_MILEAGE ||
hidpp->capabilities & HIDPP_CAPABILITY_BATTERY_PERCENTAGE ||
- hidpp->capabilities & HIDPP_CAPABILITY_BATTERY_VOLTAGE)
+ hidpp->capabilities & HIDPP_CAPABILITY_BATTERY_VOLTAGE ||
+ hidpp->capabilities & HIDPP_CAPABILITY_ADC_MEASUREMENT)
battery_props[num_battery_props++] =
POWER_SUPPLY_PROP_CAPACITY;
@@ -3833,7 +3998,8 @@ static int hidpp_initialize_battery(struct hidpp_device *hidpp)
battery_props[num_battery_props++] =
POWER_SUPPLY_PROP_CAPACITY_LEVEL;
- if (hidpp->capabilities & HIDPP_CAPABILITY_BATTERY_VOLTAGE)
+ if (hidpp->capabilities & HIDPP_CAPABILITY_BATTERY_VOLTAGE ||
+ hidpp->capabilities & HIDPP_CAPABILITY_ADC_MEASUREMENT)
battery_props[num_battery_props++] =
POWER_SUPPLY_PROP_VOLTAGE_NOW;
@@ -4006,6 +4172,8 @@ static void hidpp_connect_event(struct hidpp_device *hidpp)
hidpp20_query_battery_voltage_info(hidpp);
else if (hidpp->capabilities & HIDPP_CAPABILITY_UNIFIED_BATTERY)
hidpp20_query_battery_info_1004(hidpp);
+ else if (hidpp->capabilities & HIDPP_CAPABILITY_ADC_MEASUREMENT)
+ hidpp20_query_adc_measurement_info_1f20(hidpp);
else
hidpp20_query_battery_info_1000(hidpp);
}
This is used in a number of Logitech headsets to report the voltage of the battery. Tested on a Logitech G935. Signed-off-by: Bastien Nocera <hadess@hadess.net> BugLink: https://bugzilla.kernel.org/show_bug.cgi?id=216483 --- Fixed array length checking in v2. drivers/hid/hid-logitech-hidpp.c | 172 ++++++++++++++++++++++++++++++- 1 file changed, 170 insertions(+), 2 deletions(-)