[PATCH v2 09/15] HID: logitech-hidpp: enable HID++ 1.0 battery reporting

Benjamin Tissoires
2017-02-02T14:15:03Z

Also enable battery reporting for HID++ 1.0 devices through 2 registers:
0x07: battery status -> reports only 4 levels (critical, low, good, full)
0x0D: battery mileage -> reports true pourcentage

Signed-off-by: Benjamin Tissoires <benjamin.tissoires@redhat.com>

---

no changes in v2
---
drivers/hid/hid-logitech-hidpp.c | 209 ++++++++++++++++++++++++++++++++++++++-
1 file changed, 208 insertions(+), 1 deletion(-)

diff --git a/drivers/hid/hid-logitech-hidpp.c b/drivers/hid/hid-logitech-hidpp.c
index ec3f47c..1d7dde9 100644
--- a/drivers/hid/hid-logitech-hidpp.c
+++ b/drivers/hid/hid-logitech-hidpp.c
@@ -393,6 +393,198 @@ static void hidpp_prefix_name(char **name, int name_length)
#define HIDPP_SET_LONG_REGISTER 0x82
#define HIDPP_GET_LONG_REGISTER 0x83

+#define HIDPP_REG_GENERAL 0x00
+
+static int hidpp10_enable_battery_reporting(struct hidpp_device *hidpp_dev)
+{
+ struct hidpp_report response;
+ int ret;
+ u8 params[3] = { 0 };
+
+ ret = hidpp_send_rap_command_sync(hidpp_dev,
+ REPORT_ID_HIDPP_SHORT,
+ HIDPP_GET_REGISTER,
+ HIDPP_REG_GENERAL,
+ NULL, 0, &response);
+ if (ret)
+ return ret;
+
+ memcpy(params, response.rap.params, 3);
+
+ /* Set the battery bit */
+ params[0] |= BIT(4);
+
+ return hidpp_send_rap_command_sync(hidpp_dev,
+ REPORT_ID_HIDPP_SHORT,
+ HIDPP_SET_REGISTER,
+ HIDPP_REG_GENERAL,
+ params, 3, &response);
+}
+
+#define HIDPP_REG_BATTERY_STATUS 0x07
+
+static int hidpp10_battery_status_map_level(u8 param)
+{
+ int level;
+
+ switch (param) {
+ case 1 ... 2:
+ level = 5;
+ break;
+ case 3 ... 4:
+ level = 20;
+ break;
+ case 5 ... 6:
+ level = 55;
+ break;
+ case 7:
+ level = 90;
+ break;
+ default:
+ level = 0;
+ }
+
+ return level;
+}
+
+static int hidpp10_battery_status_map_status(u8 param)
+{
+ int status;
+
+ switch (param) {
+ case 0x00:
+ /* discharging (in use) */
+ status = POWER_SUPPLY_STATUS_DISCHARGING;
+ break;
+ case 0x21: /* (standard) charging */
+ case 0x24: /* fast charging */
+ case 0x25: /* slow charging */
+ status = POWER_SUPPLY_STATUS_CHARGING;
+ break;
+ case 0x26: /* topping charge */
+ case 0x22: /* charge complete */
+ status = POWER_SUPPLY_STATUS_FULL;
+ break;
+ /*
+ * 0x01...0x1F = reserved (not charging)
+ * 0x20 = unknown
+ * 0x23 = charging error
+ * 0x27..0xff = reserved
+ */
+ default:
+ status = POWER_SUPPLY_STATUS_NOT_CHARGING;
+ break;
+ }
+
+ return status;
+}
+
+static int hidpp10_query_battery_status(struct hidpp_device *hidpp)
+{
+ struct hidpp_report response;
+ int ret;
+
+ ret = hidpp_send_rap_command_sync(hidpp,
+ REPORT_ID_HIDPP_SHORT,
+ HIDPP_GET_REGISTER,
+ HIDPP_REG_BATTERY_STATUS,
+ NULL, 0, &response);
+ if (ret)
+ return ret;
+
+ hidpp->battery.level =
+ hidpp10_battery_status_map_level(response.rap.params[0]);
+
+ hidpp->battery.status =
+ hidpp10_battery_status_map_status(response.rap.params[1]);
+
+ return 0;
+}
+
+#define HIDPP_REG_BATTERY_MILEAGE 0x0D
+
+static int hidpp10_battery_mileage_map_status(u8 param)
+{
+ int status;
+
+ switch (param >> 6) {
+ case 0x00:
+ /* discharging (in use) */
+ status = POWER_SUPPLY_STATUS_DISCHARGING;
+ break;
+ case 0x01: /* charging */
+ status = POWER_SUPPLY_STATUS_CHARGING;
+ break;
+ case 0x02: /* charge complete */
+ status = POWER_SUPPLY_STATUS_FULL;
+ break;
+ /*
+ * 0x03 = charging error
+ */
+ default:
+ status = POWER_SUPPLY_STATUS_NOT_CHARGING;
+ break;
+ }
+
+ return status;
+}
+
+static int hidpp10_query_battery_mileage(struct hidpp_device *hidpp)
+{
+ struct hidpp_report response;
+ int ret;
+
+ ret = hidpp_send_rap_command_sync(hidpp,
+ REPORT_ID_HIDPP_SHORT,
+ HIDPP_GET_REGISTER,
+ HIDPP_REG_BATTERY_MILEAGE,
+ NULL, 0, &response);
+ if (ret)
+ return ret;
+
+ hidpp->battery.level = response.rap.params[0];
+
+ hidpp->battery.status =
+ hidpp10_battery_mileage_map_status(response.rap.params[2]);
+
+ return 0;
+}
+
+static int hidpp10_battery_event(struct hidpp_device *hidpp, u8 *data, int size)
+{
+ struct hidpp_report *report = (struct hidpp_report *)data;
+ int status, level;
+ bool changed;
+
+ if (report->report_id != REPORT_ID_HIDPP_SHORT)
+ return 0;
+
+ switch (report->rap.reg_address) {
+ case HIDPP_REG_BATTERY_STATUS:
+ level = hidpp10_battery_status_map_level(report->rap.params[0]);
+ status = hidpp10_battery_status_map_status(report->rap.params[1]);
+ break;
+ case HIDPP_REG_BATTERY_MILEAGE:
+ level = report->rap.params[0];
+ status = hidpp10_battery_mileage_map_status(report->rap.params[2]);
+ break;
+ default:
+ return 0;
+ }
+
+ changed = level != hidpp->battery.level ||
+ status != hidpp->battery.status;
+
+ if (changed) {
+ hidpp->battery.level = level;
+ hidpp->battery.status = status;
+ if (hidpp->battery.ps)
+ power_supply_changed(hidpp->battery.ps);
+ }
+
+ return 0;
+}
+
#define HIDPP_REG_PAIRING_INFORMATION 0xB5
#define DEVICE_NAME 0x40

@@ -2340,6 +2532,12 @@ static int hidpp_raw_event(struct hid_device *hdev, struct hid_report *report,
return ret;
}

+ if (hidpp->quirks & HIDPP_QUIRK_HIDPP10_BATTERY) {
+ ret = hidpp10_battery_event(hidpp, data, size);
+ if (ret != 0)
+ return ret;
+ }
+
if (hidpp->quirks & HIDPP_QUIRK_CLASS_WTP)
return wtp_raw_event(hdev, data, size);
else if (hidpp->quirks & HIDPP_QUIRK_CLASS_M560)
@@ -2373,7 +2571,16 @@ static int hidpp_initialize_battery(struct hidpp_device *hidpp)
return ret;
hidpp->quirks |= HIDPP_QUIRK_HIDPP20_BATTERY;
} else {
- return -ENOENT;
+ ret = hidpp10_enable_battery_reporting(hidpp);
+ if (ret)
+ return -ENOENT;
+ ret = hidpp10_query_battery_status(hidpp);
+ if (ret) {
+ ret = hidpp10_query_battery_mileage(hidpp);
+ if (ret)
+ return -ENOENT;
+ }
+ hidpp->quirks |= HIDPP_QUIRK_HIDPP10_BATTERY;
}

battery = &hidpp->battery;
--
2.9.3