--- /dev/null
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * Power supply driver for the RICOH RN5T618 power management chip family
+ *
+ * Copyright (C) 2020 Andreas Kemnade
+ */
+
+#include <linux/kernel.h>
+#include <linux/device.h>
+#include <linux/bitops.h>
+#include <linux/errno.h>
+#include <linux/init.h>
+#include <linux/interrupt.h>
+#include <linux/module.h>
+#include <linux/mfd/rn5t618.h>
+#include <linux/platform_device.h>
+#include <linux/power_supply.h>
+#include <linux/regmap.h>
+#include <linux/slab.h>
+
+#define CHG_STATE_ADP_INPUT 0x40
+#define CHG_STATE_USB_INPUT 0x80
+#define CHG_STATE_MASK 0x1f
+#define CHG_STATE_CHG_OFF 0
+#define CHG_STATE_CHG_READY_VADP 1
+#define CHG_STATE_CHG_TRICKLE 2
+#define CHG_STATE_CHG_RAPID 3
+#define CHG_STATE_CHG_COMPLETE 4
+#define CHG_STATE_SUSPEND 5
+#define CHG_STATE_VCHG_OVER_VOL 6
+#define CHG_STATE_BAT_ERROR 7
+#define CHG_STATE_NO_BAT 8
+#define CHG_STATE_BAT_OVER_VOL 9
+#define CHG_STATE_BAT_TEMP_ERR 10
+#define CHG_STATE_DIE_ERR 11
+#define CHG_STATE_DIE_SHUTDOWN 12
+#define CHG_STATE_NO_BAT2 13
+#define CHG_STATE_CHG_READY_VUSB 14
+
+#define FG_ENABLE 1
+
+struct rn5t618_power_info {
+ struct rn5t618 *rn5t618;
+ struct platform_device *pdev;
+ struct power_supply *battery;
+ struct power_supply *usb;
+ struct power_supply *adp;
+ int irq;
+};
+
+static enum power_supply_property rn5t618_usb_props[] = {
+ POWER_SUPPLY_PROP_STATUS,
+ POWER_SUPPLY_PROP_ONLINE,
+};
+
+static enum power_supply_property rn5t618_adp_props[] = {
+ POWER_SUPPLY_PROP_STATUS,
+ POWER_SUPPLY_PROP_ONLINE,
+};
+
+
+static enum power_supply_property rn5t618_battery_props[] = {
+ POWER_SUPPLY_PROP_STATUS,
+ POWER_SUPPLY_PROP_PRESENT,
+ POWER_SUPPLY_PROP_VOLTAGE_NOW,
+ POWER_SUPPLY_PROP_CURRENT_NOW,
+ POWER_SUPPLY_PROP_CAPACITY,
+ POWER_SUPPLY_PROP_TEMP,
+ POWER_SUPPLY_PROP_TIME_TO_EMPTY_NOW,
+ POWER_SUPPLY_PROP_TIME_TO_FULL_NOW,
+ POWER_SUPPLY_PROP_TECHNOLOGY,
+ POWER_SUPPLY_PROP_CHARGE_FULL,
+ POWER_SUPPLY_PROP_CHARGE_NOW,
+};
+
+static int rn5t618_battery_read_doublereg(struct rn5t618_power_info *info,
+ u8 reg, u16 *result)
+{
+ int ret, i;
+ u8 data[2];
+ u16 old, new;
+
+ old = 0;
+ /* Prevent races when registers are changing. */
+ for (i = 0; i < 3; i++) {
+ ret = regmap_bulk_read(info->rn5t618->regmap,
+ reg, data, sizeof(data));
+ if (ret)
+ return ret;
+
+ new = data[0] << 8;
+ new |= data[1];
+ if (new == old)
+ break;
+
+ old = new;
+ }
+
+ *result = new;
+
+ return 0;
+}
+
+static int rn5t618_decode_status(unsigned int status)
+{
+ switch (status & CHG_STATE_MASK) {
+ case CHG_STATE_CHG_OFF:
+ case CHG_STATE_SUSPEND:
+ case CHG_STATE_VCHG_OVER_VOL:
+ case CHG_STATE_DIE_SHUTDOWN:
+ return POWER_SUPPLY_STATUS_DISCHARGING;
+
+ case CHG_STATE_CHG_TRICKLE:
+ case CHG_STATE_CHG_RAPID:
+ return POWER_SUPPLY_STATUS_CHARGING;
+
+ case CHG_STATE_CHG_COMPLETE:
+ return POWER_SUPPLY_STATUS_FULL;
+
+ default:
+ return POWER_SUPPLY_STATUS_NOT_CHARGING;
+ }
+}
+
+static int rn5t618_battery_status(struct rn5t618_power_info *info,
+ union power_supply_propval *val)
+{
+ unsigned int v;
+ int ret;
+
+ ret = regmap_read(info->rn5t618->regmap, RN5T618_CHGSTATE, &v);
+ if (ret)
+ return ret;
+
+ val->intval = POWER_SUPPLY_STATUS_UNKNOWN;
+
+ if (v & 0xc0) { /* USB or ADP plugged */
+ val->intval = rn5t618_decode_status(v);
+ } else
+ val->intval = POWER_SUPPLY_STATUS_DISCHARGING;
+
+ return ret;
+}
+
+static int rn5t618_battery_present(struct rn5t618_power_info *info,
+ union power_supply_propval *val)
+{
+ unsigned int v;
+ int ret;
+
+ ret = regmap_read(info->rn5t618->regmap, RN5T618_CHGSTATE, &v);
+ if (ret)
+ return ret;
+
+ v &= CHG_STATE_MASK;
+ if ((v == CHG_STATE_NO_BAT) || (v == CHG_STATE_NO_BAT2))
+ val->intval = 0;
+ else
+ val->intval = 1;
+
+ return ret;
+}
+
+static int rn5t618_battery_voltage_now(struct rn5t618_power_info *info,
+ union power_supply_propval *val)
+{
+ u16 res;
+ int ret;
+
+ ret = rn5t618_battery_read_doublereg(info, RN5T618_VOLTAGE_1, &res);
+ if (ret)
+ return ret;
+
+ val->intval = res * 2 * 2500 / 4095 * 1000;
+
+ return 0;
+}
+
+static int rn5t618_battery_current_now(struct rn5t618_power_info *info,
+ union power_supply_propval *val)
+{
+ u16 res;
+ int ret;
+
+ ret = rn5t618_battery_read_doublereg(info, RN5T618_CC_AVEREG1, &res);
+ if (ret)
+ return ret;
+
+ /* current is negative when discharging */
+ val->intval = sign_extend32(res, 13) * 1000;
+
+ return 0;
+}
+
+static int rn5t618_battery_capacity(struct rn5t618_power_info *info,
+ union power_supply_propval *val)
+{
+ unsigned int v;
+ int ret;
+
+ ret = regmap_read(info->rn5t618->regmap, RN5T618_SOC, &v);
+ if (ret)
+ return ret;
+
+ val->intval = v;
+
+ return 0;
+}
+
+static int rn5t618_battery_temp(struct rn5t618_power_info *info,
+ union power_supply_propval *val)
+{
+ u16 res;
+ int ret;
+
+ ret = rn5t618_battery_read_doublereg(info, RN5T618_TEMP_1, &res);
+ if (ret)
+ return ret;
+
+ val->intval = sign_extend32(res, 11) * 10 / 16;
+
+ return 0;
+}
+
+static int rn5t618_battery_tte(struct rn5t618_power_info *info,
+ union power_supply_propval *val)
+{
+ u16 res;
+ int ret;
+
+ ret = rn5t618_battery_read_doublereg(info, RN5T618_TT_EMPTY_H, &res);
+ if (ret)
+ return ret;
+
+ if (res == 65535)
+ return -ENODATA;
+
+ val->intval = res * 60;
+
+ return 0;
+}
+
+static int rn5t618_battery_ttf(struct rn5t618_power_info *info,
+ union power_supply_propval *val)
+{
+ u16 res;
+ int ret;
+
+ ret = rn5t618_battery_read_doublereg(info, RN5T618_TT_FULL_H, &res);
+ if (ret)
+ return ret;
+
+ if (res == 65535)
+ return -ENODATA;
+
+ val->intval = res * 60;
+
+ return 0;
+}
+
+static int rn5t618_battery_charge_full(struct rn5t618_power_info *info,
+ union power_supply_propval *val)
+{
+ u16 res;
+ int ret;
+
+ ret = rn5t618_battery_read_doublereg(info, RN5T618_FA_CAP_H, &res);
+ if (ret)
+ return ret;
+
+ val->intval = res * 1000;
+
+ return 0;
+}
+
+static int rn5t618_battery_charge_now(struct rn5t618_power_info *info,
+ union power_supply_propval *val)
+{
+ u16 res;
+ int ret;
+
+ ret = rn5t618_battery_read_doublereg(info, RN5T618_RE_CAP_H, &res);
+ if (ret)
+ return ret;
+
+ val->intval = res * 1000;
+
+ return 0;
+}
+
+static int rn5t618_battery_get_property(struct power_supply *psy,
+ enum power_supply_property psp,
+ union power_supply_propval *val)
+{
+ int ret = 0;
+ struct rn5t618_power_info *info = power_supply_get_drvdata(psy);
+
+ switch (psp) {
+ case POWER_SUPPLY_PROP_STATUS:
+ ret = rn5t618_battery_status(info, val);
+ break;
+ case POWER_SUPPLY_PROP_PRESENT:
+ ret = rn5t618_battery_present(info, val);
+ break;
+ case POWER_SUPPLY_PROP_VOLTAGE_NOW:
+ ret = rn5t618_battery_voltage_now(info, val);
+ break;
+ case POWER_SUPPLY_PROP_CURRENT_NOW:
+ ret = rn5t618_battery_current_now(info, val);
+ break;
+ case POWER_SUPPLY_PROP_CAPACITY:
+ ret = rn5t618_battery_capacity(info, val);
+ break;
+ case POWER_SUPPLY_PROP_TEMP:
+ ret = rn5t618_battery_temp(info, val);
+ break;
+ case POWER_SUPPLY_PROP_TIME_TO_EMPTY_NOW:
+ ret = rn5t618_battery_tte(info, val);
+ break;
+ case POWER_SUPPLY_PROP_TIME_TO_FULL_NOW:
+ ret = rn5t618_battery_ttf(info, val);
+ break;
+ case POWER_SUPPLY_PROP_TECHNOLOGY:
+ val->intval = POWER_SUPPLY_TECHNOLOGY_LION;
+ break;
+ case POWER_SUPPLY_PROP_CHARGE_FULL:
+ ret = rn5t618_battery_charge_full(info, val);
+ break;
+ case POWER_SUPPLY_PROP_CHARGE_NOW:
+ ret = rn5t618_battery_charge_now(info, val);
+ break;
+ default:
+ return -EINVAL;
+ }
+
+ return ret;
+}
+
+static int rn5t618_adp_get_property(struct power_supply *psy,
+ enum power_supply_property psp,
+ union power_supply_propval *val)
+{
+ struct rn5t618_power_info *info = power_supply_get_drvdata(psy);
+ unsigned int chgstate;
+ bool online;
+ int ret;
+
+ ret = regmap_read(info->rn5t618->regmap, RN5T618_CHGSTATE, &chgstate);
+ if (ret)
+ return ret;
+
+ online = !!(chgstate & CHG_STATE_ADP_INPUT);
+
+ switch (psp) {
+ case POWER_SUPPLY_PROP_ONLINE:
+ val->intval = online;
+ break;
+ case POWER_SUPPLY_PROP_STATUS:
+ if (!online) {
+ val->intval = POWER_SUPPLY_STATUS_NOT_CHARGING;
+ break;
+ }
+ val->intval = rn5t618_decode_status(chgstate);
+ if (val->intval != POWER_SUPPLY_STATUS_CHARGING)
+ val->intval = POWER_SUPPLY_STATUS_NOT_CHARGING;
+
+ break;
+ default:
+ return -EINVAL;
+ }
+
+ return 0;
+}
+
+static int rn5t618_usb_get_property(struct power_supply *psy,
+ enum power_supply_property psp,
+ union power_supply_propval *val)
+{
+ struct rn5t618_power_info *info = power_supply_get_drvdata(psy);
+ unsigned int chgstate;
+ bool online;
+ int ret;
+
+ ret = regmap_read(info->rn5t618->regmap, RN5T618_CHGSTATE, &chgstate);
+ if (ret)
+ return ret;
+
+ online = !!(chgstate & CHG_STATE_USB_INPUT);
+
+ switch (psp) {
+ case POWER_SUPPLY_PROP_ONLINE:
+ val->intval = online;
+ break;
+ case POWER_SUPPLY_PROP_STATUS:
+ if (!online) {
+ val->intval = POWER_SUPPLY_STATUS_NOT_CHARGING;
+ break;
+ }
+ val->intval = rn5t618_decode_status(chgstate);
+ if (val->intval != POWER_SUPPLY_STATUS_CHARGING)
+ val->intval = POWER_SUPPLY_STATUS_NOT_CHARGING;
+
+ break;
+ default:
+ return -EINVAL;
+ }
+
+ return 0;
+}
+
+static const struct power_supply_desc rn5t618_battery_desc = {
+ .name = "rn5t618-battery",
+ .type = POWER_SUPPLY_TYPE_BATTERY,
+ .properties = rn5t618_battery_props,
+ .num_properties = ARRAY_SIZE(rn5t618_battery_props),
+ .get_property = rn5t618_battery_get_property,
+};
+
+static const struct power_supply_desc rn5t618_adp_desc = {
+ .name = "rn5t618-adp",
+ .type = POWER_SUPPLY_TYPE_MAINS,
+ .properties = rn5t618_adp_props,
+ .num_properties = ARRAY_SIZE(rn5t618_adp_props),
+ .get_property = rn5t618_adp_get_property,
+};
+
+static const struct power_supply_desc rn5t618_usb_desc = {
+ .name = "rn5t618-usb",
+ .type = POWER_SUPPLY_TYPE_USB,
+ .properties = rn5t618_usb_props,
+ .num_properties = ARRAY_SIZE(rn5t618_usb_props),
+ .get_property = rn5t618_usb_get_property,
+};
+
+static irqreturn_t rn5t618_charger_irq(int irq, void *data)
+{
+ struct device *dev = data;
+ struct rn5t618_power_info *info = dev_get_drvdata(dev);
+
+ unsigned int ctrl, stat1, stat2, err;
+
+ regmap_read(info->rn5t618->regmap, RN5T618_CHGERR_IRR, &err);
+ regmap_read(info->rn5t618->regmap, RN5T618_CHGCTRL_IRR, &ctrl);
+ regmap_read(info->rn5t618->regmap, RN5T618_CHGSTAT_IRR1, &stat1);
+ regmap_read(info->rn5t618->regmap, RN5T618_CHGSTAT_IRR2, &stat2);
+
+ regmap_write(info->rn5t618->regmap, RN5T618_CHGERR_IRR, 0);
+ regmap_write(info->rn5t618->regmap, RN5T618_CHGCTRL_IRR, 0);
+ regmap_write(info->rn5t618->regmap, RN5T618_CHGSTAT_IRR1, 0);
+ regmap_write(info->rn5t618->regmap, RN5T618_CHGSTAT_IRR2, 0);
+
+ dev_dbg(dev, "chgerr: %x chgctrl: %x chgstat: %x chgstat2: %x\n",
+ err, ctrl, stat1, stat2);
+
+ power_supply_changed(info->usb);
+ power_supply_changed(info->adp);
+ power_supply_changed(info->battery);
+
+ return IRQ_HANDLED;
+}
+
+static int rn5t618_power_probe(struct platform_device *pdev)
+{
+ int ret = 0;
+ unsigned int v;
+ struct power_supply_config psy_cfg = {};
+ struct rn5t618_power_info *info;
+
+ info = devm_kzalloc(&pdev->dev, sizeof(*info), GFP_KERNEL);
+ if (!info)
+ return -ENOMEM;
+
+ info->pdev = pdev;
+ info->rn5t618 = dev_get_drvdata(pdev->dev.parent);
+ info->irq = -1;
+
+ platform_set_drvdata(pdev, info);
+
+ ret = regmap_read(info->rn5t618->regmap, RN5T618_CONTROL, &v);
+ if (ret)
+ return ret;
+
+ if (!(v & FG_ENABLE)) {
+ /* E.g. the vendor kernels of various Kobo and Tolino Ebook
+ * readers disable the fuel gauge on shutdown. If a kernel
+ * without fuel gauge support is booted after that, the fuel
+ * gauge will get decalibrated.
+ */
+ dev_info(&pdev->dev, "Fuel gauge not enabled, enabling now\n");
+ dev_info(&pdev->dev, "Expect unprecise results\n");
+ regmap_update_bits(info->rn5t618->regmap, RN5T618_CONTROL,
+ FG_ENABLE, FG_ENABLE);
+ }
+
+ psy_cfg.drv_data = info;
+ info->battery = devm_power_supply_register(&pdev->dev,
+ &rn5t618_battery_desc,
+ &psy_cfg);
+ if (IS_ERR(info->battery)) {
+ ret = PTR_ERR(info->battery);
+ dev_err(&pdev->dev, "failed to register battery: %d\n", ret);
+ return ret;
+ }
+
+ info->adp = devm_power_supply_register(&pdev->dev,
+ &rn5t618_adp_desc,
+ &psy_cfg);
+ if (IS_ERR(info->adp)) {
+ ret = PTR_ERR(info->adp);
+ dev_err(&pdev->dev, "failed to register adp: %d\n", ret);
+ return ret;
+ }
+
+ info->usb = devm_power_supply_register(&pdev->dev,
+ &rn5t618_usb_desc,
+ &psy_cfg);
+ if (IS_ERR(info->usb)) {
+ ret = PTR_ERR(info->usb);
+ dev_err(&pdev->dev, "failed to register usb: %d\n", ret);
+ return ret;
+ }
+
+ if (info->rn5t618->irq_data)
+ info->irq = regmap_irq_get_virq(info->rn5t618->irq_data,
+ RN5T618_IRQ_CHG);
+
+ if (info->irq < 0)
+ info->irq = -1;
+ else {
+ ret = devm_request_threaded_irq(&pdev->dev, info->irq, NULL,
+ rn5t618_charger_irq,
+ IRQF_ONESHOT,
+ "rn5t618_power",
+ &pdev->dev);
+
+ if (ret < 0) {
+ dev_err(&pdev->dev, "request IRQ:%d fail\n",
+ info->irq);
+ info->irq = -1;
+ }
+ }
+
+ return 0;
+}
+
+static struct platform_driver rn5t618_power_driver = {
+ .driver = {
+ .name = "rn5t618-power",
+ },
+ .probe = rn5t618_power_probe,
+};
+
+module_platform_driver(rn5t618_power_driver);
+MODULE_ALIAS("platform:rn5t618-power");
+MODULE_DESCRIPTION("Power supply driver for RICOH RN5T618");
+MODULE_LICENSE("GPL");
projects / linux-2.6-block.git / commitdiff