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Date: Mon, 15 Apr 2024 15:05:28 -0400
From: Nícolas F. R. A. Prado <nfraprado@...labora.com>
To: Sebastian Reichel <sre@...nel.org>
Cc: kernel@...labora.com, linux-pm@...r.kernel.org,
linux-kernel@...r.kernel.org,
Nícolas F. R. A. Prado <nfraprado@...labora.com>
Subject: [PATCH v2] power: supply: sbs-battery: Handle unsupported
PROP_TIME_TO_EMPTY_NOW
Despite the RunTimeToEmpty() (0x11) function being defined in the SBS
specification as required, it seems that not all batteries implement it.
On platforms with such batteries, reading the property will cause an
error to be printed:
power_supply sbs-8-000b: driver failed to report `time_to_empty_now' property: -5
This not only pollutes the log, distracting from real problems on the
device, but also prevents the uevent file from being read since it
contains all properties, including the faulty one.
The following table summarizes the findings for a handful of platforms:
Platform Status Manufacturer Model
------------------------------------------------------------------------
mt8186-corsola-steelix-sku131072 OK BYD L22B3PG0
mt8195-cherry-tomato-r2 NOT OK PANASON AP16L5J
mt8192-asurada-spherion-r0 NOT OK PANASON AP15O5L
mt8183-kukui-jacuzzi-juniper-sku16 NOT OK LGC KT0 AP16L8J
mt8173-elm-hana OK Sunwoda L18D3PG1
sc7180-trogdor-lazor-limozeen-nots-r5 NOT OK Murata AP18C4K
sc7180-trogdor-kingoftown NOT OK 333-AC-0D-A GG02047XL
rk3399-gru-kevin OK SDI 4352D51
Detect if this is one of the quirky batteries during presence update, so
that hot-plugging works as expected, and if so report -ENODATA for
POWER_SUPPLY_PROP_TIME_TO_EMPTY_NOW, which removes it from uevent and
prevents throwing errors.
Signed-off-by: Nícolas F. R. A. Prado <nfraprado@...labora.com>
---
Changes in v2:
- Reworked patch to lay down and use a proper quirk infrastructure, and
update the quirks on the presence update callback so it works properly
even when hot-plugging different batteries
- Link to v1: https://lore.kernel.org/r/20240307-sbs-time-empty-now-error-v1-1-18d0f8702330@collabora.com
---
drivers/power/supply/sbs-battery.c | 55 ++++++++++++++++++++++++++++++++++++++
1 file changed, 55 insertions(+)
diff --git a/drivers/power/supply/sbs-battery.c b/drivers/power/supply/sbs-battery.c
index a6c204c08232..92acbda9e78e 100644
--- a/drivers/power/supply/sbs-battery.c
+++ b/drivers/power/supply/sbs-battery.c
@@ -214,6 +214,7 @@ struct sbs_info {
struct delayed_work work;
struct mutex mode_lock;
u32 flags;
+ u32 quirks;
int technology;
char strings[NR_STRING_BUFFERS][I2C_SMBUS_BLOCK_MAX + 1];
};
@@ -263,6 +264,54 @@ static void sbs_disable_charger_broadcasts(struct sbs_info *chip)
dev_dbg(&chip->client->dev, "%s\n", __func__);
}
+/* Required by the spec, but missing in some implementations */
+#define SBS_QUIRK_BROKEN_TTE_NOW BIT(0)
+
+struct sbs_quirk_entry {
+ const char *manufacturer;
+ const char *model;
+ u32 flags;
+};
+
+static const struct sbs_quirk_entry sbs_quirks[] = {
+ {"PANASON", "AP16L5J", SBS_QUIRK_BROKEN_TTE_NOW},
+ {"PANASON", "AP15O5L", SBS_QUIRK_BROKEN_TTE_NOW},
+ {"LGC KT0", "AP16L8J", SBS_QUIRK_BROKEN_TTE_NOW},
+ {"Murata", "AP18C4K", SBS_QUIRK_BROKEN_TTE_NOW},
+ {"333-AC-0D-A", "GG02047XL", SBS_QUIRK_BROKEN_TTE_NOW},
+};
+
+static const char *sbs_get_constant_string(struct sbs_info *chip,
+ enum power_supply_property psp);
+
+static void sbs_update_quirks(struct sbs_info *chip)
+{
+ const char *model;
+ const char *manufacturer;
+ unsigned int i = 0;
+
+ /* reset quirks from battery before the hot-plug event */
+ chip->quirks = 0;
+
+ manufacturer = sbs_get_constant_string(chip, POWER_SUPPLY_PROP_MANUFACTURER);
+ model = sbs_get_constant_string(chip, POWER_SUPPLY_PROP_MODEL_NAME);
+ if (IS_ERR(manufacturer) || IS_ERR(model)) {
+ dev_warn(&chip->client->dev, "Couldn't read manufacturer and model to set quirks\n");
+ return;
+ }
+
+ for (i = 0; i < ARRAY_SIZE(sbs_quirks); i++) {
+ if (strcmp(manufacturer, sbs_quirks[i].manufacturer))
+ continue;
+ if (strcmp(model, sbs_quirks[i].model))
+ continue;
+ chip->quirks |= sbs_quirks[i].flags;
+ }
+
+ if (chip->quirks & SBS_QUIRK_BROKEN_TTE_NOW)
+ dev_info(&chip->client->dev, "Added quirk disabling TIME_TO_EMPTY_NOW\n");
+}
+
static int sbs_update_presence(struct sbs_info *chip, bool is_present)
{
struct i2c_client *client = chip->client;
@@ -323,6 +372,8 @@ static int sbs_update_presence(struct sbs_info *chip, bool is_present)
dev_dbg(&client->dev, "PEC: %s\n", (client->flags & I2C_CLIENT_PEC) ?
"enabled" : "disabled");
+ sbs_update_quirks(chip);
+
if (!chip->is_present && is_present && !chip->charger_broadcasts)
sbs_disable_charger_broadcasts(chip);
@@ -614,6 +665,10 @@ static int sbs_get_battery_property(struct i2c_client *client,
struct sbs_info *chip = i2c_get_clientdata(client);
s32 ret;
+ if (psp == POWER_SUPPLY_PROP_TIME_TO_EMPTY_NOW &&
+ chip->quirks & SBS_QUIRK_BROKEN_TTE_NOW)
+ return -ENODATA;
+
ret = sbs_read_word_data(client, sbs_data[reg_offset].addr);
if (ret < 0)
return ret;
---
base-commit: 11afac187274a6177a7ac82997f8691c0f469e41
change-id: 20240307-sbs-time-empty-now-error-322bc074d3f2
Best regards,
--
Nícolas F. R. A. Prado <nfraprado@...labora.com>
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