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surface: surface3_power: Fix battery readings on batteries without a serial number

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commit 21d90aaee8 upstream.

The battery on the 2nd hand Surface 3 which I recently bought appears to
not have a serial number programmed in. This results in any I2C reads from
the registers containing the serial number failing with an I2C NACK.

This was causing mshw0011_bix() to fail causing the battery readings to
not work at all.

Ignore EREMOTEIO (I2C NACK) errors when retrieving the serial number and
continue with an empty serial number to fix this.

Fixes: b1f81b496b ("platform/x86: surface3_power: MSHW0011 rev-eng implementation")
BugLink: https://github.com/linux-surface/linux-surface/issues/608
Reviewed-by: Benjamin Tissoires <benjamin.tissoires@redhat.com>
Reviewed-by: Maximilian Luz <luzmaximilian@gmail.com>
Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Link: https://lore.kernel.org/r/20220224101848.7219-1-hdegoede@redhat.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Hans de Goede
2022-02-24 11:18:48 +01:00
committed by Greg Kroah-Hartman
parent 91f56a8527
commit a184f4dd9b
1 changed files with 10 additions and 3 deletions
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13
drivers/platform/x86/surface3_power.c
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@@ -233,14 +233,21 @@ static int mshw0011_bix(struct mshw0011_data *cdata, struct bix *bix)
}
bix->last_full_charg_capacity = ret;
/* get serial number */
/*
* Get serial number, on some devices (with unofficial replacement
* battery?) reading any of the serial number range addresses gets
* nacked in this case just leave the serial number empty.
*/
ret = i2c_smbus_read_i2c_block_data(client, MSHW0011_BAT0_REG_SERIAL_NO,
sizeof(buf), buf);
if (ret != sizeof(buf)) {
if (ret == -EREMOTEIO) {
/* no serial number available */
} else if (ret != sizeof(buf)) {
dev_err(&client->dev, "Error reading serial no: %d\n", ret);
return ret;
} else {
snprintf(bix->serial, ARRAY_SIZE(bix->serial), "%3pE%6pE", buf + 7, buf);
}
snprintf(bix->serial, ARRAY_SIZE(bix->serial), "%3pE%6pE", buf + 7, buf);
/* get cycle count */
ret = i2c_smbus_read_word_data(client, MSHW0011_BAT0_REG_CYCLE_CNT);