@@ -23,6 +23,16 @@ Optional Properties:
- constant-charge-current-max-microamp: maximum constant input current
- constant-charge-voltage-max-microvolt: maximum constant input voltage
- factory-internal-resistance-micro-ohms: battery factory internal resistance
+ - ocv-capacity-table-0: An array providing the battery capacity percent
+ with corresponding open circuit voltage (OCV) of the battery, which
+ is used to look up battery capacity according to current OCV value.
+ - ocv-capacity-table-1: Same as ocv-capacity-table-0
+ ......
+ - ocv-capacity-table-n: Same as ocv-capacity-table-0
+ - ocv-capacity-table-temperatures: An array containing the temperature
+ in degree Celsius, for each of the battery capacity lookup table.
+ The first temperature value specifies the OCV table 0, and the second
+ temperature value specifies the OCV table 1, and so on.
Battery properties are named, where possible, for the corresponding
elements in enum power_supply_property, defined in
@@ -44,6 +54,10 @@ Example:
constant-charge-current-max-microamp = <900000>;
constant-charge-voltage-max-microvolt = <4200000>;
factory-internal-resistance-micro-ohms = <250000>;
+ ocv-capacity-table-temperatures = <(-10) 0 10>;
+ ocv-capacity-table-0 = <4185000 100>, <4113000 95>, <4066000 90>, ...;
+ ocv-capacity-table-1 = <4200000 100>, <4185000 95>, <4113000 90>, ...;
+ ocv-capacity-table-2 = <4250000 100>, <4200000 95>, <4185000 90>, ...;
};
charger: charger@11 {
@@ -570,7 +570,7 @@ int power_supply_get_battery_info(struct power_supply *psy,
{
struct device_node *battery_np;
const char *value;
- int err;
+ int err, len, index;
info->energy_full_design_uwh = -EINVAL;
info->charge_full_design_uah = -EINVAL;
@@ -581,6 +581,12 @@ int power_supply_get_battery_info(struct power_supply *psy,
info->constant_charge_voltage_max_uv = -EINVAL;
info->factory_internal_resistance_uohm = -EINVAL;
+ for (index = 0; index < POWER_SUPPLY_OCV_TEMP_MAX; index++) {
+ info->ocv_table[index] = NULL;
+ info->ocv_temp[index] = -EINVAL;
+ info->ocv_table_size[index] = -EINVAL;
+ }
+
if (!psy->of_node) {
dev_warn(&psy->dev, "%s currently only supports devicetree\n",
__func__);
@@ -620,10 +626,127 @@ int power_supply_get_battery_info(struct power_supply *psy,
of_property_read_u32(battery_np, "factory-internal-resistance-micro-ohms",
&info->factory_internal_resistance_uohm);
+ len = of_property_count_u32_elems(battery_np,
+ "ocv-capacity-table-temperatures");
+ if (len < 0 && len != -EINVAL) {
+ return len;
+ } else if (len > POWER_SUPPLY_OCV_TEMP_MAX) {
+ dev_err(&psy->dev, "Too many temperature values\n");
+ return -EINVAL;
+ } else if (len > 0) {
+ of_property_read_u32_array(battery_np,
+ "ocv-capacity-table-temperatures",
+ info->ocv_temp, len);
+ }
+
+ for (index = 0; index < len; index++) {
+ struct power_supply_battery_ocv_table *table;
+ char *propname;
+ const __be32 *list;
+ int i, tab_len, size;
+
+ propname = kasprintf(GFP_KERNEL, "ocv-capacity-table-%d", index);
+ list = of_get_property(battery_np, propname, &size);
+ if (!list || !size) {
+ dev_err(&psy->dev, "failed to get %s\n", propname);
+ kfree(propname);
+ power_supply_put_battery_info(psy, info);
+ return -EINVAL;
+ }
+
+ kfree(propname);
+ tab_len = size / (2 * sizeof(__be32));
+ info->ocv_table_size[index] = tab_len;
+
+ table = info->ocv_table[index] =
+ devm_kzalloc(&psy->dev, tab_len * sizeof(*table),
+ GFP_KERNEL);
+ if (!info->ocv_table[index]) {
+ power_supply_put_battery_info(psy, info);
+ return -ENOMEM;
+ }
+
+ for (i = 0; i < tab_len; i++) {
+ table[i].ocv = be32_to_cpu(*list++);
+ table[i].capacity = be32_to_cpu(*list++);
+ }
+ }
+
return 0;
}
EXPORT_SYMBOL_GPL(power_supply_get_battery_info);
+void power_supply_put_battery_info(struct power_supply *psy,
+ struct power_supply_battery_info *info)
+{
+ int i;
+
+ for (i = 0; i < POWER_SUPPLY_OCV_TEMP_MAX; i++)
+ kfree(info->ocv_table[i]);
+}
+EXPORT_SYMBOL_GPL(power_supply_put_battery_info);
+
+int power_supply_ocv2cap_simple(struct power_supply_battery_ocv_table *table,
+ int table_len, int ocv)
+{
+ int i, cap, tmp;
+
+ for (i = 0; i < table_len; i++)
+ if (ocv > table[i].ocv)
+ break;
+
+ if (i > 0 && i < table_len) {
+ tmp = (table[i - 1].capacity - table[i].capacity) *
+ (ocv - table[i].ocv);
+ tmp /= table[i - 1].ocv - table[i].ocv;
+ cap = tmp + table[i].capacity;
+ } else if (i == 0) {
+ cap = table[0].capacity;
+ } else {
+ cap = table[table_len - 1].capacity;
+ }
+
+ return cap;
+}
+EXPORT_SYMBOL_GPL(power_supply_ocv2cap_simple);
+
+struct power_supply_battery_ocv_table *
+power_supply_find_ocv2cap_table(struct power_supply_battery_info *info,
+ int temp, int *table_len)
+{
+ int best_temp_diff = INT_MAX, best_index = 0, temp_diff, i;
+
+ if (!info->ocv_table[0])
+ return NULL;
+
+ for (i = 0; i < POWER_SUPPLY_OCV_TEMP_MAX; i++) {
+ temp_diff = abs(info->ocv_temp[i] - temp);
+
+ if (temp_diff < best_temp_diff) {
+ best_temp_diff = temp_diff;
+ best_index = i;
+ }
+ }
+
+ *table_len = info->ocv_table_size[best_index];
+ return info->ocv_table[best_index];
+}
+EXPORT_SYMBOL_GPL(power_supply_find_ocv2cap_table);
+
+int power_supply_batinfo_ocv2cap(struct power_supply_battery_info *info,
+ int ocv, int temp)
+{
+ struct power_supply_battery_ocv_table *table;
+ int table_len;
+
+ table = power_supply_find_ocv2cap_table(info, temp, &table_len);
+ if (!table)
+ return -EINVAL;
+
+ return power_supply_ocv2cap_simple(table, table_len, ocv);
+}
+EXPORT_SYMBOL_GPL(power_supply_batinfo_ocv2cap);
+
int power_supply_get_property(struct power_supply *psy,
enum power_supply_property psp,
union power_supply_propval *val)
@@ -309,6 +309,13 @@ struct power_supply_info {
int use_for_apm;
};
+struct power_supply_battery_ocv_table {
+ int ocv; /* microVolts */
+ int capacity; /* percent */
+};
+
+#define POWER_SUPPLY_OCV_TEMP_MAX 20
+
/*
* This is the recommended struct to manage static battery parameters,
* populated by power_supply_get_battery_info(). Most platform drivers should
@@ -327,6 +334,9 @@ struct power_supply_battery_info {
int constant_charge_current_max_ua; /* microAmps */
int constant_charge_voltage_max_uv; /* microVolts */
int factory_internal_resistance_uohm; /* microOhms */
+ int ocv_temp[POWER_SUPPLY_OCV_TEMP_MAX];/* celsius */
+ struct power_supply_battery_ocv_table *ocv_table[POWER_SUPPLY_OCV_TEMP_MAX];
+ int ocv_table_size[POWER_SUPPLY_OCV_TEMP_MAX];
};
extern struct atomic_notifier_head power_supply_notifier;
@@ -350,6 +360,15 @@ extern struct power_supply *devm_power_supply_get_by_phandle(
extern int power_supply_get_battery_info(struct power_supply *psy,
struct power_supply_battery_info *info);
+extern void power_supply_put_battery_info(struct power_supply *psy,
+ struct power_supply_battery_info *info);
+extern int power_supply_ocv2cap_simple(struct power_supply_battery_ocv_table *table,
+ int table_len, int ocv);
+extern struct power_supply_battery_ocv_table *
+power_supply_find_ocv2cap_table(struct power_supply_battery_info *info,
+ int temp, int *table_len);
+extern int power_supply_batinfo_ocv2cap(struct power_supply_battery_info *info,
+ int ocv, int temp);
extern void power_supply_changed(struct power_supply *psy);
extern int power_supply_am_i_supplied(struct power_supply *psy);
extern int power_supply_set_input_current_limit_from_supplier(