This patch uses the new battery hooking API to add
support for the ACPI battery wear control present in
Lenovo ThinkPads that have >=SandyBridge processors.
thinkpad_acpi registers two new attributes for each battery:
1) Charge start threshold
/sys/class/power_supply/BATN/charge_start_threshold
Valid values are [0, 99]. A value of 0 turns off the
start threshold wear control.
2) Charge stop threshold
/sys/class/power_supply/BATN/charge_stop_threshold
Valid values are [1, 100]. A value of 100 turns off
the stop threshold wear control. This must be
configured first.
This patch depends on the following patches:
"battery: Add the battery hooking API"
"battery: Add the ThinkPad "Not Charging" quirk"
Signed-off-by: Ognjen Galic <smclt...@gmail.com>
---
drivers/platform/x86/thinkpad_acpi.c | 469 ++++++++++++++++++++++++++++++++++-
1 file changed, 468 insertions(+), 1 deletion(-)
diff --git a/drivers/platform/x86/thinkpad_acpi.c
b/drivers/platform/x86/thinkpad_acpi.c
index 117be48..b479f80 100644
--- a/drivers/platform/x86/thinkpad_acpi.c
+++ b/drivers/platform/x86/thinkpad_acpi.c
@@ -23,7 +23,7 @@
#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
-#define TPACPI_VERSION "0.25"
+#define TPACPI_VERSION "0.26"
#define TPACPI_SYSFS_VERSION 0x030000
/*
@@ -77,6 +77,7 @@
#include <linux/jiffies.h>
#include <linux/workqueue.h>
#include <linux/acpi.h>
+#include <linux/power_supply.h>
#include <linux/pci_ids.h>
#include <linux/thinkpad_acpi.h>
#include <sound/core.h>
@@ -84,6 +85,8 @@
#include <sound/initval.h>
#include <linux/uaccess.h>
#include <acpi/video.h>
+#include <acpi/battery.h>
+
/* ThinkPad CMOS commands */
#define TP_CMOS_VOLUME_DOWN 0
@@ -331,6 +334,7 @@ static struct {
u32 sensors_pdev_attrs_registered:1;
u32 hotkey_poll_active:1;
u32 has_adaptive_kbd:1;
+ u32 battery:1;
} tp_features;
static struct {
@@ -9201,6 +9205,466 @@ static struct ibm_struct mute_led_driver_data = {
.resume = mute_led_resume,
};
+/***************** Battery Wear Control Driver ******************/
+
+/* Metadata */
+
+#define GET_START "BCTG"
+#define SET_START "BCCS"
+#define GET_STOP "BCSG"
+#define SET_STOP "BCSS"
+
+#define START_ATTR "charge_start_threshold"
+#define STOP_ATTR "charge_stop_threshold"
+
+enum {
+ BAT_ANY = 0,
+ BAT_PRIMARY = 1,
+ BAT_SECONDARY = 2
+};
+
+enum {
+ /* Error condition bit */
+ METHOD_ERR = (1 << 31),
+};
+
+enum {
+ /* This is used in the get/set helpers */
+ THRESHOLD_START,
+ THRESHOLD_STOP,
+};
+
+struct tpacpi_battery_driver_data {
+ int start_charge[3];
+ int stop_charge[3];
+ int start_support[3];
+ int stop_support[3];
+ int individual_addressing;
+};
+
+static struct tpacpi_battery_driver_data battery_info;
+
+/* ACPI helpers/functions/probes */
+
+/**
+ * This evaluates a ACPI method call specific to the battery
+ * ACPI extension. The specifics are that an error is marked
+ * in the 32rd bit of the response, so we just check that here.
+ *
+ * Returns 0 on success
+ */
+static int tpacpi_battery_eval(char *method, int *ret, int param)
+{
+ if (!acpi_evalf(hkey_handle, ret, method, "dd", param)) {
+ pr_err("%s: evaluate failed", method);
+ return AE_ERROR;
+ }
+
+ if (*ret & METHOD_ERR) {
+ pr_err("%s evaluated but flagged as error", method);
+ return AE_ERROR;
+ }
+
+ return AE_OK;
+}
+
+static int tpacpi_battery_get(int what, int battery, int *ret)
+{
+ switch (what) {
+
+ case THRESHOLD_START:
+
+ if (tpacpi_battery_eval(GET_START, ret, battery))
+ return -ENODEV;
+
+ /* The value is in the low 8 bits of the response */
+ *ret = *ret & 0xFF;
+ return 0;
+
+ case THRESHOLD_STOP:
+
+ if (tpacpi_battery_eval(GET_STOP, ret, battery))
+ return -ENODEV;
+
+ /* Value is in lower 8 bits */
+ *ret = *ret & 0xFF;
+
+ /*
+ * On the stop value, if we return 0 that
+ * does not make any sense. 0 means Default, which
+ * means that charging stops at 100%, so we return
+ * that.
+ */
+ *ret = *ret == 0 ? 100 : *ret;
+ return 0;
+
+ default:
+ pr_crit("wrong parameter: %d", what);
+ return -EINVAL;
+ }
+
+}
+
+static int tpacpi_battery_set(int what, int battery, int value)
+{
+
+ int param = 0x0, ret = 0xFFFFFFFF;
+
+ /* The first 8 bits are the value of the threshold */
+ param = value;
+ /* The battery ID is in bits 8-9, 2 bits */
+ param |= (battery << 8);
+
+ switch (what) {
+
+ case THRESHOLD_START:
+
+ if (tpacpi_battery_eval(SET_START, &ret, param)) {
+ pr_err("failed to set charge threshold on battery %d",
+ battery);
+ return -ENODEV;
+ }
+
+ return 0;
+
+ case THRESHOLD_STOP:
+
+ if (tpacpi_battery_eval(SET_STOP, &ret, param)) {
+ pr_err("failed to set charge stop threshold: %d",
+ battery);
+ return -ENODEV;
+ }
+
+ return 0;
+
+ default:
+ pr_crit("wrong parameter: %d", what);
+ return -EINVAL;
+ }
+
+}
+
+static int tpacpi_battery_probe(int battery)
+{
+ int ret = 0;
+
+ /* Reset the struct */
+ battery_info.start_support[battery] = 0x0;
+ battery_info.stop_support[battery] = 0x0;
+ battery_info.start_charge[battery] = 0x0;
+ battery_info.stop_charge[battery] = 0x0;
+
+ /*
+ * 1) Get the current start threshold
+ * 2) Check for support
+ * 3) Get the current stop threshold
+ * 4) Check for support
+ */
+
+ if (acpi_has_method(hkey_handle, GET_START)) {
+
+ if (tpacpi_battery_eval(GET_START, &ret, battery)) {
+ pr_err("Error probing battery %d\n", battery);
+ return -ENODEV;
+ }
+
+ /* Individual addressing is in bit 9 */
+ if (ret & (1 << 9))
+ battery_info.individual_addressing = true;
+
+ /* Support is marked in bit 8 */
+ if (ret & (1 << 8))
+ battery_info.start_support[battery] = 1;
+ else
+ return -ENODEV;
+
+ if (tpacpi_battery_get(THRESHOLD_START, battery,
+ &battery_info.start_charge[battery])) {
+ pr_err("Error probing battery %d\n", battery);
+ return -ENODEV;
+ }
+
+ }
+
+ if (acpi_has_method(hkey_handle, GET_STOP)) {
+
+ if (tpacpi_battery_eval(GET_STOP, &ret, battery)) {
+ pr_err("Error probing battery stop; %d\n", battery);
+ return -ENODEV;
+ }
+
+ /* Support is marked in bit 8 */
+ if (ret & (1 << 8))
+ battery_info.stop_support[battery] = 1;
+ else
+ return -ENODEV;
+
+ if (tpacpi_battery_get(THRESHOLD_STOP, battery,
+ &battery_info.stop_charge[battery])) {
+ pr_err("Error probing battery stop: %d\n", battery);
+ return -ENODEV;
+ }
+ }
+
+ pr_info("battery %d registered (start %d, stop %d)",
+ battery,
+ battery_info.start_charge[battery],
+ battery_info.stop_charge[battery]);
+
+ return 0;
+}
+
+/* General helper functions */
+
+static int tpacpi_battery_get_id(const char *battery_name)
+{
+
+ if (strcmp(battery_name, "BAT0") == 0)
+ return BAT_PRIMARY;
+ else if (strcmp(battery_name, "BAT1") == 0)
+ return BAT_SECONDARY;
+
+ /*
+ * If for some reason the battery is not BAT0 nor is it
+ * BAT1, we will assume it's the default, first battery,
+ * AKA primary.
+ */
+ pr_warn("unknown battery %s, assuming primary", battery_name);
+ return BAT_PRIMARY;
+}
+
+static int tpacpi_battery_get_attr(struct device_attribute *attr)
+{
+ if (strcmp(START_ATTR, attr->attr.name) == 0)
+ return THRESHOLD_START;
+ else if (strcmp(STOP_ATTR, attr->attr.name) == 0)
+ return THRESHOLD_STOP;
+
+ pr_crit("Invalid attribute: %s", attr->attr.name);
+ return -EINVAL;
+}
+
+/* sysfs interface */
+
+static ssize_t tpacpi_battery_store(struct device *dev,
+ struct device_attribute *devattr,
+ const char *buf, size_t count)
+{
+ int attr, battery;
+ long value;
+ struct power_supply *supply =
+ container_of(dev, struct power_supply, dev);
+
+ if (!supply) {
+ pr_crit("Can't upcast to power_supply!");
+ return -ENODEV;
+ }
+
+ /*
+ * Some systems have support for more than
+ * one battery. If that is the case,
+ * tpacpi_battery_probe marked that addressing
+ * them individually is supported, so we do that
+ * based on the device struct.
+ *
+ * On systems that are not supported, we assume
+ * the primary as most of the ACPI calls fail
+ * with "Any Battery" as the parameter.
+ */
+ if (battery_info.individual_addressing)
+ /* BAT_PRIMARY or BAT_SECONDARY */
+ battery = tpacpi_battery_get_id(supply->desc->name);
+ else
+ battery = BAT_PRIMARY;
+
+ if (kstrtol(buf, 10, &value))
+ return -EINVAL;
+
+ attr = tpacpi_battery_get_attr(devattr);
+
+ switch (attr) {
+
+ case THRESHOLD_START:
+
+ if (!battery_info.start_support[battery])
+ return -ENODEV;
+
+ /* valid values are [0, 99] */
+ if (value < 0 || value > 99)
+ return -EINVAL;
+
+ if (value > battery_info.stop_charge[battery])
+ return -EINVAL;
+
+ if (tpacpi_battery_set(THRESHOLD_START, battery, value))
+ return -ENODEV;
+
+ battery_info.start_charge[battery] = value;
+ return count;
+
+ case THRESHOLD_STOP:
+
+ if (!battery_info.stop_support[battery])
+ return -ENODEV;
+
+ /* valid values are [1, 100] */
+ if (value < 1 || value > 100)
+ return -EINVAL;
+
+ /*
+ * When 100 is passed to stop, we need to flip
+ * it to 0 as that the EC understands that as
+ * "Default", which will charge to 100%
+ */
+ value = value == 100 ? 0 : value;
+
+ if (value < battery_info.start_charge[battery])
+ return -EINVAL;
+
+ if (tpacpi_battery_set(THRESHOLD_STOP, battery, value))
+ return -EINVAL;
+
+ battery_info.stop_charge[battery] = value;
+ return count;
+
+ default:
+ pr_crit("Wrong parameter: %d", attr);
+ return -EINVAL;
+ }
+
+ return count;
+}
+
+static ssize_t tpacpi_battery_show(struct device *dev,
+ struct device_attribute *devattr,
+ char *buf)
+{
+ int ret = 0x0, attr, battery;
+ struct power_supply *supply =
+ container_of(dev, struct power_supply, dev);
+
+ if (!supply) {
+ pr_crit("Can't upcast to power_supply!");
+ return -ENODEV;
+ }
+
+ /* THRESHOLD_START or THRESHOLD_STOP */
+ attr = tpacpi_battery_get_attr(devattr);
+
+ /*
+ * Some systems have support for more than
+ * one battery. If that is the case,
+ * tpacpi_battery_probe marked that addressing
+ * them individually is supported, so we do that
+ * based on the device struct.
+ *
+ * On systems that are not supported, we assume
+ * the primary as most of the ACPI calls fail
+ * with "Any Battery" as the parameter.
+ */
+ if (battery_info.individual_addressing)
+ /* BAT_PRIMARY or BAT_SECONDARY */
+ battery = tpacpi_battery_get_id(supply->desc->name);
+ else
+ battery = BAT_PRIMARY;
+
+ if (tpacpi_battery_get(attr, battery, &ret))
+ return -ENODEV;
+
+ return sprintf(buf, "%d\n", ret);
+}
+
+static const struct device_attribute battery_start = {
+ .show = tpacpi_battery_show,
+ .store = tpacpi_battery_store,
+ .attr = {
+ .name = START_ATTR,
+ .mode = 0644,
+ },
+};
+
+static const struct device_attribute battery_stop = {
+ .show = tpacpi_battery_show,
+ .store = tpacpi_battery_store,
+ .attr = {
+ .name = STOP_ATTR,
+ .mode = 0644,
+ },
+};
+
+/* ACPI battery hooking */
+
+static int tpacpi_battery_add(struct power_supply *battery)
+{
+ int batteryid = tpacpi_battery_get_id(battery->desc->name);
+
+ pr_info("battery %s added", battery->desc->name);
+
+ if (tpacpi_battery_probe(batteryid))
+ return -ENODEV;
+
+ if (device_create_file(&battery->dev, &battery_start))
+ return -ENODEV;
+
+ if (device_create_file(&battery->dev, &battery_stop))
+ return -ENODEV;
+
+ return 0;
+}
+
+static int tpacpi_battery_remove(struct power_supply *battery)
+{
+ pr_info("battery %s removed", battery->desc->name);
+ device_remove_file(&battery->dev, &battery_start);
+ device_remove_file(&battery->dev, &battery_stop);
+ return 0;
+}
+
+static struct acpi_battery_hook battery_hook = {
+ .add_battery = tpacpi_battery_add,
+ .remove_battery = tpacpi_battery_remove,
+ .name = "ThinkPad Battery Extension",
+};
+
+/* Subdriver init/exit */
+
+static int __init tpacpi_battery_init(struct ibm_init_struct *ibm)
+{
+ void (*battery_hook_reg)(struct acpi_battery_hook *hook);
+
+ battery_hook_reg = symbol_get(battery_hook_register);
+
+ if (!battery_hook_reg) {
+ pr_err("ACPI battery driver unavailable, not loading battery
driver");
+ return 0;
+ }
+
+ battery_hook_reg(&battery_hook);
+ pr_info("battery driver initialized");
+ battery_info.individual_addressing = 0;
+
+ return 0;
+}
+
+static void tpacpi_battery_exit(void)
+{
+ void (*battery_hook_unreg)(struct acpi_battery_hook *hook);
+
+ battery_hook_unreg = symbol_get(battery_hook_register);
+
+ if (!battery_hook_unreg) {
+ pr_crit("ACPI battery driver not available but was at init!");
+ return;
+ }
+
+ battery_hook_unreg(&battery_hook);
+}
+
+static struct ibm_struct battery_driver_data = {
+ .name = "battery",
+ .exit = tpacpi_battery_exit,
+};
+
/****************************************************************************
****************************************************************************
*
@@ -9647,6 +10111,9 @@ static struct ibm_init_struct ibms_init[] __initdata = {
.init = mute_led_init,
.data = &mute_led_driver_data,
},
+ { .init = tpacpi_battery_init,
+ .data = &battery_driver_data,
+ },
};
static int __init set_ibm_param(const char *val, const struct kernel_param *kp)
--
2.7.4
