diff options
Diffstat (limited to 'drivers/acpi/battery.c')
| -rw-r--r-- | drivers/acpi/battery.c | 77 |
1 files changed, 77 insertions, 0 deletions
diff --git a/drivers/acpi/battery.c b/drivers/acpi/battery.c index 45e3e1759fb8..7efaeaa53b88 100644 --- a/drivers/acpi/battery.c +++ b/drivers/acpi/battery.c @@ -34,6 +34,7 @@ #include <linux/dmi.h> #include <linux/slab.h> #include <linux/suspend.h> +#include <asm/unaligned.h> #ifdef CONFIG_ACPI_PROCFS_POWER #include <linux/proc_fs.h> @@ -95,6 +96,18 @@ enum { ACPI_BATTERY_ALARM_PRESENT, ACPI_BATTERY_XINFO_PRESENT, ACPI_BATTERY_QUIRK_PERCENTAGE_CAPACITY, + /* On Lenovo Thinkpad models from 2010 and 2011, the power unit + switches between mWh and mAh depending on whether the system + is running on battery or not. When mAh is the unit, most + reported values are incorrect and need to be adjusted by + 10000/design_voltage. Verified on x201, t410, t410s, and x220. + Pre-2010 and 2012 models appear to always report in mWh and + are thus unaffected (tested with t42, t61, t500, x200, x300, + and x230). Also, in mid-2012 Lenovo issued a BIOS update for + the 2011 models that fixes the issue (tested on x220 with a + post-1.29 BIOS), but as of Nov. 2012, no such update is + available for the 2010 models. */ + ACPI_BATTERY_QUIRK_THINKPAD_MAH, }; struct acpi_battery { @@ -438,6 +451,21 @@ static int acpi_battery_get_info(struct acpi_battery *battery) kfree(buffer.pointer); if (test_bit(ACPI_BATTERY_QUIRK_PERCENTAGE_CAPACITY, &battery->flags)) battery->full_charge_capacity = battery->design_capacity; + if (test_bit(ACPI_BATTERY_QUIRK_THINKPAD_MAH, &battery->flags) && + battery->power_unit && battery->design_voltage) { + battery->design_capacity = battery->design_capacity * + 10000 / battery->design_voltage; + battery->full_charge_capacity = battery->full_charge_capacity * + 10000 / battery->design_voltage; + battery->design_capacity_warning = + battery->design_capacity_warning * + 10000 / battery->design_voltage; + /* Curiously, design_capacity_low, unlike the rest of them, + is correct. */ + /* capacity_granularity_* equal 1 on the systems tested, so + it's impossible to tell if they would need an adjustment + or not if their values were higher. */ + } return result; } @@ -486,6 +514,11 @@ static int acpi_battery_get_state(struct acpi_battery *battery) && battery->capacity_now >= 0 && battery->capacity_now <= 100) battery->capacity_now = (battery->capacity_now * battery->full_charge_capacity) / 100; + if (test_bit(ACPI_BATTERY_QUIRK_THINKPAD_MAH, &battery->flags) && + battery->power_unit && battery->design_voltage) { + battery->capacity_now = battery->capacity_now * + 10000 / battery->design_voltage; + } return result; } @@ -595,6 +628,24 @@ static void sysfs_remove_battery(struct acpi_battery *battery) mutex_unlock(&battery->sysfs_lock); } +static void find_battery(const struct dmi_header *dm, void *private) +{ + struct acpi_battery *battery = (struct acpi_battery *)private; + /* Note: the hardcoded offsets below have been extracted from + the source code of dmidecode. */ + if (dm->type == DMI_ENTRY_PORTABLE_BATTERY && dm->length >= 8) { + const u8 *dmi_data = (const u8 *)(dm + 1); + int dmi_capacity = get_unaligned((const u16 *)(dmi_data + 6)); + if (dm->length >= 18) + dmi_capacity *= dmi_data[17]; + if (battery->design_capacity * battery->design_voltage / 1000 + != dmi_capacity && + battery->design_capacity * 10 == dmi_capacity) + set_bit(ACPI_BATTERY_QUIRK_THINKPAD_MAH, + &battery->flags); + } +} + /* * According to the ACPI spec, some kinds of primary batteries can * report percentage battery remaining capacity directly to OS. @@ -620,6 +671,32 @@ static void acpi_battery_quirks(struct acpi_battery *battery) battery->capacity_now = (battery->capacity_now * battery->full_charge_capacity) / 100; } + + if (test_bit(ACPI_BATTERY_QUIRK_THINKPAD_MAH, &battery->flags)) + return ; + + if (battery->power_unit && dmi_name_in_vendors("LENOVO")) { + const char *s; + s = dmi_get_system_info(DMI_PRODUCT_VERSION); + if (s && !strnicmp(s, "ThinkPad", 8)) { + dmi_walk(find_battery, battery); + if (test_bit(ACPI_BATTERY_QUIRK_THINKPAD_MAH, + &battery->flags) && + battery->design_voltage) { + battery->design_capacity = + battery->design_capacity * + 10000 / battery->design_voltage; + battery->full_charge_capacity = + battery->full_charge_capacity * + 10000 / battery->design_voltage; + battery->design_capacity_warning = + battery->design_capacity_warning * + 10000 / battery->design_voltage; + battery->capacity_now = battery->capacity_now * + 10000 / battery->design_voltage; + } + } + } } static int acpi_battery_update(struct acpi_battery *battery) |