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Message-Id: <20190604232827.26008-1-pedro@pedrovanzella.com>
Date: Tue, 4 Jun 2019 19:28:26 -0400
From: Pedro Vanzella <pedro@...rovanzella.com>
To: linux-input@...r.kernel.org
Cc: Pedro Vanzella <pedro@...rovanzella.com>,
Jiri Kosina <jikos@...nel.org>,
Benjamin Tissoires <benjamin.tissoires@...hat.com>,
linux-kernel@...r.kernel.org
Subject: [PATCH 1/2] HID: hid-logitech-hidpp: Report battery voltage
Newer devices have a feature with id 0x1001 that reports the battery
voltage instead of the old feature with id 0x1000 that reports a
percentage.
This patch fetches and decodes this data for all devices that
support it.
Signed-off-by: Pedro Vanzella <pedro@...rovanzella.com>
---
drivers/hid/hid-logitech-hidpp.c | 108 ++++++++++++++++++++++++++++++-
1 file changed, 106 insertions(+), 2 deletions(-)
diff --git a/drivers/hid/hid-logitech-hidpp.c b/drivers/hid/hid-logitech-hidpp.c
index 72fc9c0566db..e68ea44b0d24 100644
--- a/drivers/hid/hid-logitech-hidpp.c
+++ b/drivers/hid/hid-logitech-hidpp.c
@@ -91,6 +91,7 @@ MODULE_PARM_DESC(disable_tap_to_click,
#define HIDPP_CAPABILITY_HIDPP20_BATTERY BIT(1)
#define HIDPP_CAPABILITY_BATTERY_MILEAGE BIT(2)
#define HIDPP_CAPABILITY_BATTERY_LEVEL_STATUS BIT(3)
+#define HIDPP_CAPABILITY_BATTERY_VOLTAGE BIT(4)
/*
* There are two hidpp protocols in use, the first version hidpp10 is known
@@ -139,12 +140,14 @@ struct hidpp_report {
struct hidpp_battery {
u8 feature_index;
u8 solar_feature_index;
+ u8 voltage_feature_index;
struct power_supply_desc desc;
struct power_supply *ps;
char name[64];
int status;
int capacity;
int level;
+ int voltage; /* in millivolts */
bool online;
};
@@ -1223,6 +1226,93 @@ static int hidpp20_battery_event(struct hidpp_device *hidpp,
return 0;
}
+/* -------------------------------------------------------------------------- */
+/* 0x1001: Battery voltage */
+/* -------------------------------------------------------------------------- */
+
+#define HIDPP_PAGE_BATTERY_VOLTAGE 0x1001
+
+#define CMD_BATTERY_VOLTAGE_GET_BATTERY_VOLTAGE 0x00
+
+static int hidpp20_battery_map_status_voltage(u8 data[3], int *voltage)
+{
+ int status;
+
+ switch (data[2]) {
+ case 0x00: /* discharging */
+ status = POWER_SUPPLY_STATUS_DISCHARGING;
+ break;
+ case 0x10: /* wireless charging */
+ case 0x80: /* charging */
+ status = POWER_SUPPLY_STATUS_CHARGING;
+ break;
+ case 0x81: /* fully charged */
+ status = POWER_SUPPLY_STATUS_FULL;
+ break;
+ default:
+ status = POWER_SUPPLY_STATUS_NOT_CHARGING;
+ }
+
+ *voltage = (data[0] << 8) + data[1];
+
+ return status;
+}
+
+static int hidpp20_battery_get_battery_voltage(struct hidpp_device *hidpp,
+ u8 feature_index,
+ int *status, int *voltage)
+{
+ struct hidpp_report response;
+ int ret;
+ u8 *params = (u8 *)response.fap.params;
+
+ ret = hidpp_send_fap_command_sync(hidpp, feature_index,
+ CMD_BATTERY_VOLTAGE_GET_BATTERY_VOLTAGE,
+ NULL, 0, &response);
+
+ if (ret > 0) {
+ hid_err(hidpp->hid_dev, "%s: received protocol error 0x%02x\n",
+ __func__, ret);
+ return -EPROTO;
+ }
+ if (ret)
+ return ret;
+
+ hidpp->capabilities |= HIDPP_CAPABILITY_BATTERY_VOLTAGE;
+
+ *status = hidpp20_battery_map_status_voltage(params, voltage);
+
+ return 0;
+}
+
+static int hidpp20_query_battery_voltage_info(struct hidpp_device *hidpp)
+{
+ u8 feature_type;
+ int ret;
+ int status, voltage;
+
+ if (hidpp->battery.voltage_feature_index == 0xff) {
+ ret = hidpp_root_get_feature(hidpp, HIDPP_PAGE_BATTERY_VOLTAGE,
+ &hidpp->battery.voltage_feature_index,
+ &feature_type);
+ if (ret)
+ return ret;
+ }
+
+ ret = hidpp20_battery_get_battery_voltage(hidpp,
+ hidpp->battery.voltage_feature_index,
+ &status, &voltage);
+
+ if (ret)
+ return ret;
+
+ hidpp->battery.status = status;
+ hidpp->battery.voltage = voltage;
+ hidpp->battery.online = status != POWER_SUPPLY_STATUS_NOT_CHARGING;
+
+ return 0;
+}
+
static enum power_supply_property hidpp_battery_props[] = {
POWER_SUPPLY_PROP_ONLINE,
POWER_SUPPLY_PROP_STATUS,
@@ -1232,6 +1322,7 @@ static enum power_supply_property hidpp_battery_props[] = {
POWER_SUPPLY_PROP_SERIAL_NUMBER,
0, /* placeholder for POWER_SUPPLY_PROP_CAPACITY, */
0, /* placeholder for POWER_SUPPLY_PROP_CAPACITY_LEVEL, */
+ 0, /* placeholder for POWER_SUPPLY_PROP_VOLTAGE_NOW, */
};
static int hidpp_battery_get_property(struct power_supply *psy,
@@ -1269,6 +1360,9 @@ static int hidpp_battery_get_property(struct power_supply *psy,
case POWER_SUPPLY_PROP_SERIAL_NUMBER:
val->strval = hidpp->hid_dev->uniq;
break;
+ case POWER_SUPPLY_PROP_VOLTAGE_NOW:
+ val->intval = hidpp->battery.voltage;
+ break;
default:
ret = -EINVAL;
break;
@@ -3208,12 +3302,16 @@ 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;
if (hidpp->protocol_major >= 2) {
if (hidpp->quirks & HIDPP_QUIRK_CLASS_K750)
ret = hidpp_solar_request_battery_event(hidpp);
- else
+ else {
ret = hidpp20_query_battery_info(hidpp);
+ if (ret)
+ ret = hidpp20_query_battery_voltage_info(hidpp);
+ }
if (ret)
return ret;
@@ -3238,7 +3336,7 @@ static int hidpp_initialize_battery(struct hidpp_device *hidpp)
if (!battery_props)
return -ENOMEM;
- num_battery_props = ARRAY_SIZE(hidpp_battery_props) - 2;
+ num_battery_props = ARRAY_SIZE(hidpp_battery_props) - 3;
if (hidpp->capabilities & HIDPP_CAPABILITY_BATTERY_MILEAGE)
battery_props[num_battery_props++] =
@@ -3248,6 +3346,10 @@ 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)
+ battery_props[num_battery_props++] =
+ POWER_SUPPLY_PROP_VOLTAGE_NOW;
+
battery = &hidpp->battery;
n = atomic_inc_return(&battery_no) - 1;
@@ -3412,6 +3514,8 @@ static void hidpp_connect_event(struct hidpp_device *hidpp)
hidpp10_query_battery_status(hidpp);
} else if (hidpp->capabilities & HIDPP_CAPABILITY_HIDPP20_BATTERY) {
hidpp20_query_battery_info(hidpp);
+ if (hidpp->capabilities & HIDPP_CAPABILITY_BATTERY_VOLTAGE)
+ hidpp20_query_battery_voltage_info(hidpp);
}
if (hidpp->battery.ps)
power_supply_changed(hidpp->battery.ps);
--
2.21.0
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