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linux/linux-5.18.11/drivers/power/supply/rn5t618_power.c

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// 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/iio/consumer.h>
#include <linux/init.h>
#include <linux/interrupt.h>
#include <linux/module.h>
#include <linux/mfd/rn5t618.h>
#include <linux/of_device.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 GCHGDET_TYPE_MASK 0x30
#define GCHGDET_TYPE_SDP 0x00
#define GCHGDET_TYPE_CDP 0x10
#define GCHGDET_TYPE_DCP 0x20
#define FG_ENABLE 1
/*
* Formula seems accurate for battery current, but for USB current around 70mA
* per step was seen on Kobo Clara HD but all sources show the same formula
* also fur USB current. To avoid accidentially unwanted high currents we stick
* to that formula
*/
#define TO_CUR_REG(x) ((x) / 100000 - 1)
#define FROM_CUR_REG(x) ((((x) & 0x1f) + 1) * 100000)
#define CHG_MIN_CUR 100000
#define CHG_MAX_CUR 1800000
#define ADP_MAX_CUR 2500000
#define USB_MAX_CUR 1400000
struct rn5t618_power_info {
struct rn5t618 *rn5t618;
struct platform_device *pdev;
struct power_supply *battery;
struct power_supply *usb;
struct power_supply *adp;
struct iio_channel *channel_vusb;
struct iio_channel *channel_vadp;
int irq;
};
static enum power_supply_usb_type rn5t618_usb_types[] = {
POWER_SUPPLY_USB_TYPE_SDP,
POWER_SUPPLY_USB_TYPE_DCP,
POWER_SUPPLY_USB_TYPE_CDP,
POWER_SUPPLY_USB_TYPE_UNKNOWN
};
static enum power_supply_property rn5t618_usb_props[] = {
/* input current limit is not very accurate */
POWER_SUPPLY_PROP_INPUT_CURRENT_LIMIT,
POWER_SUPPLY_PROP_VOLTAGE_NOW,
POWER_SUPPLY_PROP_STATUS,
POWER_SUPPLY_PROP_USB_TYPE,
POWER_SUPPLY_PROP_ONLINE,
};
static enum power_supply_property rn5t618_adp_props[] = {
/* input current limit is not very accurate */
POWER_SUPPLY_PROP_INPUT_CURRENT_LIMIT,
POWER_SUPPLY_PROP_VOLTAGE_NOW,
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_CONTROL_LIMIT,
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_set_current_limit(struct rn5t618_power_info *info,
const union power_supply_propval *val)
{
if (val->intval < CHG_MIN_CUR)
return -EINVAL;
if (val->intval >= CHG_MAX_CUR)
return -EINVAL;
return regmap_update_bits(info->rn5t618->regmap,
RN5T618_CHGISET,
0x1F, TO_CUR_REG(val->intval));
}
static int rn5t618_battery_get_current_limit(struct rn5t618_power_info *info,
union power_supply_propval *val)
{
unsigned int regval;
int ret;
ret = regmap_read(info->rn5t618->regmap, RN5T618_CHGISET,
&regval);
if (ret < 0)
return ret;
val->intval = FROM_CUR_REG(regval);
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_CONTROL_LIMIT:
ret = rn5t618_battery_get_current_limit(info, val);
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_battery_set_property(struct power_supply *psy,
enum power_supply_property psp,
const union power_supply_propval *val)
{
struct rn5t618_power_info *info = power_supply_get_drvdata(psy);
switch (psp) {
case POWER_SUPPLY_PROP_CHARGE_CONTROL_LIMIT:
return rn5t618_battery_set_current_limit(info, val);
default:
return -EINVAL;
}
}
static int rn5t618_battery_property_is_writeable(struct power_supply *psy,
enum power_supply_property psp)
{
switch (psp) {
case POWER_SUPPLY_PROP_CHARGE_CONTROL_LIMIT:
return true;
default:
return false;
}
}
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;
unsigned int regval;
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;
case POWER_SUPPLY_PROP_INPUT_CURRENT_LIMIT:
ret = regmap_read(info->rn5t618->regmap,
RN5T618_REGISET1, &regval);
if (ret < 0)
return ret;
val->intval = FROM_CUR_REG(regval);
break;
case POWER_SUPPLY_PROP_VOLTAGE_NOW:
if (!info->channel_vadp)
return -ENODATA;
ret = iio_read_channel_processed_scale(info->channel_vadp, &val->intval, 1000);
if (ret < 0)
return ret;
break;
default:
return -EINVAL;
}
return 0;
}
static int rn5t618_adp_set_property(struct power_supply *psy,
enum power_supply_property psp,
const union power_supply_propval *val)
{
struct rn5t618_power_info *info = power_supply_get_drvdata(psy);
int ret;
switch (psp) {
case POWER_SUPPLY_PROP_INPUT_CURRENT_LIMIT:
if (val->intval > ADP_MAX_CUR)
return -EINVAL;
if (val->intval < CHG_MIN_CUR)
return -EINVAL;
ret = regmap_write(info->rn5t618->regmap, RN5T618_REGISET1,
TO_CUR_REG(val->intval));
if (ret < 0)
return ret;
break;
default:
return -EINVAL;
}
return 0;
}
static int rn5t618_adp_property_is_writeable(struct power_supply *psy,
enum power_supply_property psp)
{
switch (psp) {
case POWER_SUPPLY_PROP_INPUT_CURRENT_LIMIT:
return true;
default:
return false;
}
}
static int rc5t619_usb_get_type(struct rn5t618_power_info *info,
union power_supply_propval *val)
{
unsigned int regval;
int ret;
ret = regmap_read(info->rn5t618->regmap, RN5T618_GCHGDET, &regval);
if (ret < 0)
return ret;
switch (regval & GCHGDET_TYPE_MASK) {
case GCHGDET_TYPE_SDP:
val->intval = POWER_SUPPLY_USB_TYPE_SDP;
break;
case GCHGDET_TYPE_CDP:
val->intval = POWER_SUPPLY_USB_TYPE_CDP;
break;
case GCHGDET_TYPE_DCP:
val->intval = POWER_SUPPLY_USB_TYPE_DCP;
break;
default:
val->intval = POWER_SUPPLY_USB_TYPE_UNKNOWN;
}
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;
unsigned int regval;
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;
case POWER_SUPPLY_PROP_USB_TYPE:
if (!online || (info->rn5t618->variant != RC5T619))
return -ENODATA;
return rc5t619_usb_get_type(info, val);
case POWER_SUPPLY_PROP_INPUT_CURRENT_LIMIT:
ret = regmap_read(info->rn5t618->regmap, RN5T618_CHGCTL1,
&regval);
if (ret < 0)
return ret;
val->intval = 0;
if (regval & 2) {
ret = regmap_read(info->rn5t618->regmap,
RN5T618_REGISET2,
&regval);
if (ret < 0)
return ret;
val->intval = FROM_CUR_REG(regval);
}
break;
case POWER_SUPPLY_PROP_VOLTAGE_NOW:
if (!info->channel_vusb)
return -ENODATA;
ret = iio_read_channel_processed_scale(info->channel_vusb, &val->intval, 1000);
if (ret < 0)
return ret;
break;
default:
return -EINVAL;
}
return 0;
}
static int rn5t618_usb_set_property(struct power_supply *psy,
enum power_supply_property psp,
const union power_supply_propval *val)
{
struct rn5t618_power_info *info = power_supply_get_drvdata(psy);
int ret;
switch (psp) {
case POWER_SUPPLY_PROP_INPUT_CURRENT_LIMIT:
if (val->intval > USB_MAX_CUR)
return -EINVAL;
if (val->intval < CHG_MIN_CUR)
return -EINVAL;
ret = regmap_write(info->rn5t618->regmap, RN5T618_REGISET2,
0xE0 | TO_CUR_REG(val->intval));
if (ret < 0)
return ret;
break;
default:
return -EINVAL;
}
return 0;
}
static int rn5t618_usb_property_is_writeable(struct power_supply *psy,
enum power_supply_property psp)
{
switch (psp) {
case POWER_SUPPLY_PROP_INPUT_CURRENT_LIMIT:
return true;
default:
return false;
}
}
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,
.set_property = rn5t618_battery_set_property,
.property_is_writeable = rn5t618_battery_property_is_writeable,
};
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,
.set_property = rn5t618_adp_set_property,
.property_is_writeable = rn5t618_adp_property_is_writeable,
};
static const struct power_supply_desc rn5t618_usb_desc = {
.name = "rn5t618-usb",
.type = POWER_SUPPLY_TYPE_USB,
.usb_types = rn5t618_usb_types,
.num_usb_types = ARRAY_SIZE(rn5t618_usb_types),
.properties = rn5t618_usb_props,
.num_properties = ARRAY_SIZE(rn5t618_usb_props),
.get_property = rn5t618_usb_get_property,
.set_property = rn5t618_usb_set_property,
.property_is_writeable = rn5t618_usb_property_is_writeable,
};
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);
info->channel_vusb = devm_iio_channel_get(&pdev->dev, "vusb");
if (IS_ERR(info->channel_vusb)) {
if (PTR_ERR(info->channel_vusb) == -ENODEV)
return -EPROBE_DEFER;
return PTR_ERR(info->channel_vusb);
}
info->channel_vadp = devm_iio_channel_get(&pdev->dev, "vadp");
if (IS_ERR(info->channel_vadp)) {
if (PTR_ERR(info->channel_vadp) == -ENODEV)
return -EPROBE_DEFER;
return PTR_ERR(info->channel_vadp);
}
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 imprecise 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");
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