557 lines
13 KiB
C
557 lines
13 KiB
C
// SPDX-License-Identifier: GPL-2.0+
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/*
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* Power supply driver for the RICOH RN5T618 power management chip family
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*
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* Copyright (C) 2020 Andreas Kemnade
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*/
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#include <linux/kernel.h>
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#include <linux/device.h>
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#include <linux/bitops.h>
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#include <linux/errno.h>
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#include <linux/init.h>
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#include <linux/interrupt.h>
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#include <linux/module.h>
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#include <linux/mfd/rn5t618.h>
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#include <linux/platform_device.h>
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#include <linux/power_supply.h>
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#include <linux/regmap.h>
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#include <linux/slab.h>
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#define CHG_STATE_ADP_INPUT 0x40
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#define CHG_STATE_USB_INPUT 0x80
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#define CHG_STATE_MASK 0x1f
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#define CHG_STATE_CHG_OFF 0
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#define CHG_STATE_CHG_READY_VADP 1
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#define CHG_STATE_CHG_TRICKLE 2
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#define CHG_STATE_CHG_RAPID 3
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#define CHG_STATE_CHG_COMPLETE 4
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#define CHG_STATE_SUSPEND 5
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#define CHG_STATE_VCHG_OVER_VOL 6
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#define CHG_STATE_BAT_ERROR 7
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#define CHG_STATE_NO_BAT 8
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#define CHG_STATE_BAT_OVER_VOL 9
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#define CHG_STATE_BAT_TEMP_ERR 10
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#define CHG_STATE_DIE_ERR 11
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#define CHG_STATE_DIE_SHUTDOWN 12
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#define CHG_STATE_NO_BAT2 13
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#define CHG_STATE_CHG_READY_VUSB 14
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#define FG_ENABLE 1
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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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struct power_supply *battery;
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struct power_supply *usb;
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struct power_supply *adp;
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int irq;
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};
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static enum power_supply_property rn5t618_usb_props[] = {
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POWER_SUPPLY_PROP_STATUS,
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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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POWER_SUPPLY_PROP_STATUS,
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POWER_SUPPLY_PROP_ONLINE,
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};
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static enum power_supply_property rn5t618_battery_props[] = {
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POWER_SUPPLY_PROP_STATUS,
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POWER_SUPPLY_PROP_PRESENT,
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POWER_SUPPLY_PROP_VOLTAGE_NOW,
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POWER_SUPPLY_PROP_CURRENT_NOW,
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POWER_SUPPLY_PROP_CAPACITY,
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POWER_SUPPLY_PROP_TEMP,
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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_FULL,
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POWER_SUPPLY_PROP_CHARGE_NOW,
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};
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static int rn5t618_battery_read_doublereg(struct rn5t618_power_info *info,
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u8 reg, u16 *result)
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{
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int ret, i;
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u8 data[2];
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u16 old, new;
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old = 0;
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/* Prevent races when registers are changing. */
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for (i = 0; i < 3; i++) {
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ret = regmap_bulk_read(info->rn5t618->regmap,
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reg, data, sizeof(data));
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if (ret)
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return ret;
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new = data[0] << 8;
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new |= data[1];
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if (new == old)
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break;
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old = new;
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}
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*result = new;
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return 0;
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}
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static int rn5t618_decode_status(unsigned int status)
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{
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switch (status & CHG_STATE_MASK) {
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case CHG_STATE_CHG_OFF:
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case CHG_STATE_SUSPEND:
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case CHG_STATE_VCHG_OVER_VOL:
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case CHG_STATE_DIE_SHUTDOWN:
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return POWER_SUPPLY_STATUS_DISCHARGING;
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case CHG_STATE_CHG_TRICKLE:
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case CHG_STATE_CHG_RAPID:
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return POWER_SUPPLY_STATUS_CHARGING;
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case CHG_STATE_CHG_COMPLETE:
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return POWER_SUPPLY_STATUS_FULL;
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default:
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return POWER_SUPPLY_STATUS_NOT_CHARGING;
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}
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}
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static int rn5t618_battery_status(struct rn5t618_power_info *info,
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union power_supply_propval *val)
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{
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unsigned int v;
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int ret;
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ret = regmap_read(info->rn5t618->regmap, RN5T618_CHGSTATE, &v);
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if (ret)
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return ret;
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val->intval = POWER_SUPPLY_STATUS_UNKNOWN;
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if (v & 0xc0) { /* USB or ADP plugged */
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val->intval = rn5t618_decode_status(v);
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} else
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val->intval = POWER_SUPPLY_STATUS_DISCHARGING;
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return ret;
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}
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static int rn5t618_battery_present(struct rn5t618_power_info *info,
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union power_supply_propval *val)
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{
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unsigned int v;
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int ret;
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ret = regmap_read(info->rn5t618->regmap, RN5T618_CHGSTATE, &v);
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if (ret)
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return ret;
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v &= CHG_STATE_MASK;
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if ((v == CHG_STATE_NO_BAT) || (v == CHG_STATE_NO_BAT2))
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val->intval = 0;
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else
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val->intval = 1;
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return ret;
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}
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static int rn5t618_battery_voltage_now(struct rn5t618_power_info *info,
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union power_supply_propval *val)
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{
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u16 res;
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int ret;
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ret = rn5t618_battery_read_doublereg(info, RN5T618_VOLTAGE_1, &res);
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if (ret)
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return ret;
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val->intval = res * 2 * 2500 / 4095 * 1000;
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return 0;
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}
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static int rn5t618_battery_current_now(struct rn5t618_power_info *info,
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union power_supply_propval *val)
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{
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u16 res;
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int ret;
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ret = rn5t618_battery_read_doublereg(info, RN5T618_CC_AVEREG1, &res);
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if (ret)
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return ret;
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/* current is negative when discharging */
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val->intval = sign_extend32(res, 13) * 1000;
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return 0;
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}
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static int rn5t618_battery_capacity(struct rn5t618_power_info *info,
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union power_supply_propval *val)
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{
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unsigned int v;
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int ret;
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ret = regmap_read(info->rn5t618->regmap, RN5T618_SOC, &v);
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if (ret)
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return ret;
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val->intval = v;
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return 0;
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}
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static int rn5t618_battery_temp(struct rn5t618_power_info *info,
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union power_supply_propval *val)
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{
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u16 res;
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int ret;
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ret = rn5t618_battery_read_doublereg(info, RN5T618_TEMP_1, &res);
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if (ret)
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return ret;
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val->intval = sign_extend32(res, 11) * 10 / 16;
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return 0;
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}
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static int rn5t618_battery_tte(struct rn5t618_power_info *info,
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union power_supply_propval *val)
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{
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u16 res;
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int ret;
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ret = rn5t618_battery_read_doublereg(info, RN5T618_TT_EMPTY_H, &res);
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if (ret)
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return ret;
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if (res == 65535)
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return -ENODATA;
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val->intval = res * 60;
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return 0;
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}
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static int rn5t618_battery_ttf(struct rn5t618_power_info *info,
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union power_supply_propval *val)
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{
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u16 res;
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int ret;
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ret = rn5t618_battery_read_doublereg(info, RN5T618_TT_FULL_H, &res);
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if (ret)
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return ret;
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if (res == 65535)
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return -ENODATA;
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val->intval = res * 60;
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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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u16 res;
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int ret;
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ret = rn5t618_battery_read_doublereg(info, RN5T618_FA_CAP_H, &res);
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if (ret)
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return ret;
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val->intval = res * 1000;
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return 0;
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}
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static int rn5t618_battery_charge_now(struct rn5t618_power_info *info,
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union power_supply_propval *val)
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{
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u16 res;
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int ret;
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ret = rn5t618_battery_read_doublereg(info, RN5T618_RE_CAP_H, &res);
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if (ret)
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return ret;
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val->intval = res * 1000;
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return 0;
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}
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static int rn5t618_battery_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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int ret = 0;
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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_STATUS:
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ret = rn5t618_battery_status(info, val);
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break;
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case POWER_SUPPLY_PROP_PRESENT:
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ret = rn5t618_battery_present(info, val);
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break;
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case POWER_SUPPLY_PROP_VOLTAGE_NOW:
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ret = rn5t618_battery_voltage_now(info, val);
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break;
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case POWER_SUPPLY_PROP_CURRENT_NOW:
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ret = rn5t618_battery_current_now(info, val);
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break;
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case POWER_SUPPLY_PROP_CAPACITY:
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ret = rn5t618_battery_capacity(info, val);
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break;
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case POWER_SUPPLY_PROP_TEMP:
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ret = rn5t618_battery_temp(info, val);
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break;
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case POWER_SUPPLY_PROP_TIME_TO_EMPTY_NOW:
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ret = rn5t618_battery_tte(info, val);
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break;
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case POWER_SUPPLY_PROP_TIME_TO_FULL_NOW:
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ret = rn5t618_battery_ttf(info, val);
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break;
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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_FULL:
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ret = rn5t618_battery_charge_full(info, val);
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break;
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case POWER_SUPPLY_PROP_CHARGE_NOW:
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ret = rn5t618_battery_charge_now(info, val);
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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 ret;
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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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bool online;
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int ret;
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ret = regmap_read(info->rn5t618->regmap, RN5T618_CHGSTATE, &chgstate);
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if (ret)
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return ret;
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online = !!(chgstate & CHG_STATE_ADP_INPUT);
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switch (psp) {
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case POWER_SUPPLY_PROP_ONLINE:
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val->intval = online;
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break;
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case POWER_SUPPLY_PROP_STATUS:
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if (!online) {
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val->intval = POWER_SUPPLY_STATUS_NOT_CHARGING;
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break;
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}
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val->intval = rn5t618_decode_status(chgstate);
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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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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_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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bool online;
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int ret;
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ret = regmap_read(info->rn5t618->regmap, RN5T618_CHGSTATE, &chgstate);
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if (ret)
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return ret;
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online = !!(chgstate & CHG_STATE_USB_INPUT);
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switch (psp) {
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case POWER_SUPPLY_PROP_ONLINE:
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val->intval = online;
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break;
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case POWER_SUPPLY_PROP_STATUS:
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if (!online) {
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val->intval = POWER_SUPPLY_STATUS_NOT_CHARGING;
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break;
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}
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val->intval = rn5t618_decode_status(chgstate);
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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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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 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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};
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static const struct power_supply_desc rn5t618_adp_desc = {
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.name = "rn5t618-adp",
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.type = POWER_SUPPLY_TYPE_MAINS,
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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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};
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static const struct power_supply_desc rn5t618_usb_desc = {
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.name = "rn5t618-usb",
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.type = POWER_SUPPLY_TYPE_USB,
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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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};
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static irqreturn_t rn5t618_charger_irq(int irq, void *data)
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{
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struct device *dev = data;
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struct rn5t618_power_info *info = dev_get_drvdata(dev);
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unsigned int ctrl, stat1, stat2, err;
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regmap_read(info->rn5t618->regmap, RN5T618_CHGERR_IRR, &err);
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regmap_read(info->rn5t618->regmap, RN5T618_CHGCTRL_IRR, &ctrl);
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regmap_read(info->rn5t618->regmap, RN5T618_CHGSTAT_IRR1, &stat1);
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regmap_read(info->rn5t618->regmap, RN5T618_CHGSTAT_IRR2, &stat2);
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regmap_write(info->rn5t618->regmap, RN5T618_CHGERR_IRR, 0);
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regmap_write(info->rn5t618->regmap, RN5T618_CHGCTRL_IRR, 0);
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regmap_write(info->rn5t618->regmap, RN5T618_CHGSTAT_IRR1, 0);
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regmap_write(info->rn5t618->regmap, RN5T618_CHGSTAT_IRR2, 0);
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dev_dbg(dev, "chgerr: %x chgctrl: %x chgstat: %x chgstat2: %x\n",
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err, ctrl, stat1, stat2);
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power_supply_changed(info->usb);
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power_supply_changed(info->adp);
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power_supply_changed(info->battery);
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return IRQ_HANDLED;
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}
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static int rn5t618_power_probe(struct platform_device *pdev)
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{
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int ret = 0;
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unsigned int v;
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struct power_supply_config psy_cfg = {};
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struct rn5t618_power_info *info;
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info = devm_kzalloc(&pdev->dev, sizeof(*info), GFP_KERNEL);
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if (!info)
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return -ENOMEM;
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info->pdev = pdev;
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info->rn5t618 = dev_get_drvdata(pdev->dev.parent);
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info->irq = -1;
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platform_set_drvdata(pdev, info);
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ret = regmap_read(info->rn5t618->regmap, RN5T618_CONTROL, &v);
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if (ret)
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return ret;
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if (!(v & FG_ENABLE)) {
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/* E.g. the vendor kernels of various Kobo and Tolino Ebook
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* readers disable the fuel gauge on shutdown. If a kernel
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* without fuel gauge support is booted after that, the fuel
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* gauge will get decalibrated.
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*/
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dev_info(&pdev->dev, "Fuel gauge not enabled, enabling now\n");
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dev_info(&pdev->dev, "Expect imprecise results\n");
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regmap_update_bits(info->rn5t618->regmap, RN5T618_CONTROL,
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FG_ENABLE, FG_ENABLE);
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}
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psy_cfg.drv_data = info;
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info->battery = devm_power_supply_register(&pdev->dev,
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&rn5t618_battery_desc,
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&psy_cfg);
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if (IS_ERR(info->battery)) {
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ret = PTR_ERR(info->battery);
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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");
|