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synced 2024-10-06 00:39:48 +00:00
power: supply: rn5t618: Add input current limit
Adds properties for setting the maximum current to USB, ADP and Battery supplies. USB and ADP limits are reset to OTP values upon replugging. Signed-off-by: Andreas Kemnade <andreas@kemnade.info> Signed-off-by: Sebastian Reichel <sebastian.reichel@collabora.com>
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7d76367774
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1 changed files with 188 additions and 0 deletions
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@ -44,6 +44,20 @@
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#define FG_ENABLE 1
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/*
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* Formula seems accurate for battery current, but for USB current around 70mA
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* per step was seen on Kobo Clara HD but all sources show the same formula
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* also fur USB current. To avoid accidentially unwanted high currents we stick
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* to that formula
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*/
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#define TO_CUR_REG(x) ((x) / 100000 - 1)
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#define FROM_CUR_REG(x) ((((x) & 0x1f) + 1) * 100000)
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#define CHG_MIN_CUR 100000
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#define CHG_MAX_CUR 1800000
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#define ADP_MAX_CUR 2500000
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#define USB_MAX_CUR 1400000
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struct rn5t618_power_info {
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struct rn5t618 *rn5t618;
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struct platform_device *pdev;
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@ -61,12 +75,16 @@ static enum power_supply_usb_type rn5t618_usb_types[] = {
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};
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static enum power_supply_property rn5t618_usb_props[] = {
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/* input current limit is not very accurate */
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POWER_SUPPLY_PROP_INPUT_CURRENT_LIMIT,
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POWER_SUPPLY_PROP_STATUS,
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POWER_SUPPLY_PROP_USB_TYPE,
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POWER_SUPPLY_PROP_ONLINE,
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};
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static enum power_supply_property rn5t618_adp_props[] = {
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/* input current limit is not very accurate */
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POWER_SUPPLY_PROP_INPUT_CURRENT_LIMIT,
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POWER_SUPPLY_PROP_STATUS,
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POWER_SUPPLY_PROP_ONLINE,
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};
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@ -82,6 +100,7 @@ static enum power_supply_property rn5t618_battery_props[] = {
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POWER_SUPPLY_PROP_TIME_TO_EMPTY_NOW,
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POWER_SUPPLY_PROP_TIME_TO_FULL_NOW,
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POWER_SUPPLY_PROP_TECHNOLOGY,
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POWER_SUPPLY_PROP_CHARGE_CONTROL_LIMIT,
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POWER_SUPPLY_PROP_CHARGE_FULL,
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POWER_SUPPLY_PROP_CHARGE_NOW,
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};
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@ -271,6 +290,36 @@ static int rn5t618_battery_ttf(struct rn5t618_power_info *info,
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return 0;
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}
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static int rn5t618_battery_set_current_limit(struct rn5t618_power_info *info,
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const union power_supply_propval *val)
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{
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if (val->intval < CHG_MIN_CUR)
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return -EINVAL;
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if (val->intval >= CHG_MAX_CUR)
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return -EINVAL;
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return regmap_update_bits(info->rn5t618->regmap,
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RN5T618_CHGISET,
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0x1F, TO_CUR_REG(val->intval));
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}
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static int rn5t618_battery_get_current_limit(struct rn5t618_power_info *info,
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union power_supply_propval *val)
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{
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unsigned int regval;
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int ret;
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ret = regmap_read(info->rn5t618->regmap, RN5T618_CHGISET,
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®val);
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if (ret < 0)
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return ret;
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val->intval = FROM_CUR_REG(regval);
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return 0;
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}
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static int rn5t618_battery_charge_full(struct rn5t618_power_info *info,
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union power_supply_propval *val)
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{
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@ -336,6 +385,9 @@ static int rn5t618_battery_get_property(struct power_supply *psy,
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case POWER_SUPPLY_PROP_TECHNOLOGY:
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val->intval = POWER_SUPPLY_TECHNOLOGY_LION;
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break;
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case POWER_SUPPLY_PROP_CHARGE_CONTROL_LIMIT:
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ret = rn5t618_battery_get_current_limit(info, val);
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break;
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case POWER_SUPPLY_PROP_CHARGE_FULL:
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ret = rn5t618_battery_charge_full(info, val);
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break;
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@ -349,12 +401,38 @@ static int rn5t618_battery_get_property(struct power_supply *psy,
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return ret;
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}
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static int rn5t618_battery_set_property(struct power_supply *psy,
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enum power_supply_property psp,
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const union power_supply_propval *val)
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{
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struct rn5t618_power_info *info = power_supply_get_drvdata(psy);
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switch (psp) {
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case POWER_SUPPLY_PROP_CHARGE_CONTROL_LIMIT:
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return rn5t618_battery_set_current_limit(info, val);
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default:
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return -EINVAL;
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}
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}
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static int rn5t618_battery_property_is_writeable(struct power_supply *psy,
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enum power_supply_property psp)
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{
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switch (psp) {
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case POWER_SUPPLY_PROP_CHARGE_CONTROL_LIMIT:
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return true;
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default:
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return false;
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}
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}
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static int rn5t618_adp_get_property(struct power_supply *psy,
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enum power_supply_property psp,
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union power_supply_propval *val)
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{
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struct rn5t618_power_info *info = power_supply_get_drvdata(psy);
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unsigned int chgstate;
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unsigned int regval;
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bool online;
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int ret;
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@ -377,6 +455,14 @@ static int rn5t618_adp_get_property(struct power_supply *psy,
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if (val->intval != POWER_SUPPLY_STATUS_CHARGING)
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val->intval = POWER_SUPPLY_STATUS_NOT_CHARGING;
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break;
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case POWER_SUPPLY_PROP_INPUT_CURRENT_LIMIT:
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ret = regmap_read(info->rn5t618->regmap,
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RN5T618_REGISET1, ®val);
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if (ret < 0)
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return ret;
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val->intval = FROM_CUR_REG(regval);
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break;
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default:
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return -EINVAL;
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@ -385,6 +471,45 @@ static int rn5t618_adp_get_property(struct power_supply *psy,
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return 0;
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}
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static int rn5t618_adp_set_property(struct power_supply *psy,
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enum power_supply_property psp,
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const union power_supply_propval *val)
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{
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struct rn5t618_power_info *info = power_supply_get_drvdata(psy);
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int ret;
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switch (psp) {
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case POWER_SUPPLY_PROP_INPUT_CURRENT_LIMIT:
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if (val->intval > ADP_MAX_CUR)
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return -EINVAL;
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if (val->intval < CHG_MIN_CUR)
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return -EINVAL;
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ret = regmap_write(info->rn5t618->regmap, RN5T618_REGISET1,
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TO_CUR_REG(val->intval));
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if (ret < 0)
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return ret;
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break;
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default:
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return -EINVAL;
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}
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return 0;
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}
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static int rn5t618_adp_property_is_writeable(struct power_supply *psy,
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enum power_supply_property psp)
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{
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switch (psp) {
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case POWER_SUPPLY_PROP_INPUT_CURRENT_LIMIT:
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return true;
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default:
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return false;
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}
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}
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static int rc5t619_usb_get_type(struct rn5t618_power_info *info,
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union power_supply_propval *val)
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{
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@ -418,6 +543,7 @@ static int rn5t618_usb_get_property(struct power_supply *psy,
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{
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struct rn5t618_power_info *info = power_supply_get_drvdata(psy);
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unsigned int chgstate;
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unsigned int regval;
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bool online;
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int ret;
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@ -446,6 +572,23 @@ static int rn5t618_usb_get_property(struct power_supply *psy,
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return -ENODATA;
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return rc5t619_usb_get_type(info, val);
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case POWER_SUPPLY_PROP_INPUT_CURRENT_LIMIT:
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ret = regmap_read(info->rn5t618->regmap, RN5T618_CHGCTL1,
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®val);
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if (ret < 0)
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return ret;
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val->intval = 0;
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if (regval & 2) {
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ret = regmap_read(info->rn5t618->regmap,
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RN5T618_REGISET2,
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®val);
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if (ret < 0)
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return ret;
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val->intval = FROM_CUR_REG(regval);
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}
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break;
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default:
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return -EINVAL;
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}
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@ -453,12 +596,53 @@ static int rn5t618_usb_get_property(struct power_supply *psy,
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return 0;
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}
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static int rn5t618_usb_set_property(struct power_supply *psy,
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enum power_supply_property psp,
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const union power_supply_propval *val)
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{
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struct rn5t618_power_info *info = power_supply_get_drvdata(psy);
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int ret;
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switch (psp) {
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case POWER_SUPPLY_PROP_INPUT_CURRENT_LIMIT:
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if (val->intval > USB_MAX_CUR)
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return -EINVAL;
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if (val->intval < CHG_MIN_CUR)
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return -EINVAL;
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ret = regmap_write(info->rn5t618->regmap, RN5T618_REGISET2,
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0xE0 | TO_CUR_REG(val->intval));
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if (ret < 0)
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return ret;
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break;
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default:
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return -EINVAL;
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}
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return 0;
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}
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static int rn5t618_usb_property_is_writeable(struct power_supply *psy,
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enum power_supply_property psp)
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{
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switch (psp) {
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case POWER_SUPPLY_PROP_INPUT_CURRENT_LIMIT:
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return true;
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default:
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return false;
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}
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}
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static const struct power_supply_desc rn5t618_battery_desc = {
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.name = "rn5t618-battery",
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.type = POWER_SUPPLY_TYPE_BATTERY,
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.properties = rn5t618_battery_props,
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.num_properties = ARRAY_SIZE(rn5t618_battery_props),
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.get_property = rn5t618_battery_get_property,
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.set_property = rn5t618_battery_set_property,
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.property_is_writeable = rn5t618_battery_property_is_writeable,
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};
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static const struct power_supply_desc rn5t618_adp_desc = {
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@ -467,6 +651,8 @@ static const struct power_supply_desc rn5t618_adp_desc = {
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.properties = rn5t618_adp_props,
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.num_properties = ARRAY_SIZE(rn5t618_adp_props),
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.get_property = rn5t618_adp_get_property,
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.set_property = rn5t618_adp_set_property,
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.property_is_writeable = rn5t618_adp_property_is_writeable,
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};
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static const struct power_supply_desc rn5t618_usb_desc = {
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@ -477,6 +663,8 @@ static const struct power_supply_desc rn5t618_usb_desc = {
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.properties = rn5t618_usb_props,
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.num_properties = ARRAY_SIZE(rn5t618_usb_props),
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.get_property = rn5t618_usb_get_property,
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.set_property = rn5t618_usb_set_property,
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.property_is_writeable = rn5t618_usb_property_is_writeable,
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};
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static irqreturn_t rn5t618_charger_irq(int irq, void *data)
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