/*
* Battery charger driver for TI's tps65090
*
* Copyright (c) 2013, NVIDIA CORPORATION. All rights reserved.
* This program is free software; you can redistribute it and/or modify it
* under the terms and conditions of the GNU General Public License,
* version 2, as published by the Free Software Foundation.
* This program is distributed in the hope it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
* more details.
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include <linux/delay.h>
#include <linux/err.h>
#include <linux/freezer.h>
#include <linux/init.h>
#include <linux/interrupt.h>
#include <linux/kernel.h>
#include <linux/kthread.h>
#include <linux/module.h>
#include <linux/of_device.h>
#include <linux/platform_device.h>
#include <linux/power_supply.h>
#include <linux/slab.h>
#include <linux/mfd/tps65090.h>
#define TPS65090_CHARGER_ENABLE BIT(0)
#define TPS65090_VACG BIT(1)
#define TPS65090_NOITERM BIT(5)
#define POLL_INTERVAL (HZ * 2) /* Used when no irq */
struct tps65090_charger {
struct device *dev;
int ac_online;
int prev_ac_online;
int irq;
struct task_struct *poll_task;
bool passive_mode;
struct power_supply ac;
struct tps65090_platform_data *pdata;
};
static enum power_supply_property tps65090_ac_props[] = {
POWER_SUPPLY_PROP_ONLINE,
};
static int tps65090_low_chrg_current(struct tps65090_charger *charger)
{
int ret;
if (charger->passive_mode)
return 0;
ret = tps65090_write(charger->dev->parent, TPS65090_REG_CG_CTRL5,
TPS65090_NOITERM);
if (ret < 0) {
dev_err(charger->dev, "%s(): error reading in register 0x%x\n",
__func__, TPS65090_REG_CG_CTRL5);
return ret;
}
return 0;
}
static int tps65090_enable_charging(struct tps65090_charger *charger)
{
int ret;
uint8_t ctrl0 = 0;
if (charger->passive_mode)
return 0;
ret = tps65090_read(charger->dev->parent, TPS65090_REG_CG_CTRL0,
&ctrl0);
if (ret < 0) {
dev_err(charger->dev, "%s(): error reading in register 0x%x\n",
__func__, TPS65090_REG_CG_CTRL0);
return ret;
}
ret = tps65090_write(charger->dev->parent, TPS65090_REG_CG_CTRL0,
(ctrl0 | TPS65090_CHARGER_ENABLE));
if (ret < 0) {
dev_err(charger->dev, "%s(): error writing in register 0x%x\n",
__func__, TPS65090_REG_CG_CTRL0);
return ret;
}
return 0;
}
static int tps65090_config_charger(struct tps65090_charger *charger)
{
uint8_t intrmask = 0;
int ret;
if (charger->passive_mode)
return 0;
if (charger->pdata->enable_low_current_chrg) {
ret = tps65090_low_chrg_current(charger);
if (ret < 0) {
dev_err(charger->dev,
"error configuring low charge current\n");
return ret;
}
}
/* Enable the VACG interrupt for AC power detect */
ret = tps65090_read(charger->dev->parent, TPS65090_REG_INTR_MASK,
&intrmask);
if (ret < 0) {
dev_err(charger->dev, "%s(): error reading in register 0x%x\n",
__func__, TPS65090_REG_INTR_MASK);
return ret;
}
ret = tps65090_write(charger->dev->parent, TPS65090_REG_INTR_MASK,
(intrmask | TPS65090_VACG));
if (ret < 0) {
dev_err(charger->dev, "%s(): error writing in register 0x%x\n",
__func__, TPS65090_REG_CG_CTRL0);
return ret;
}
return 0;
}
static int tps65090_ac_get_property(struct power_supply *psy,
enum power_supply_property psp,
union power_supply_propval *val)
{
struct tps65090_charger *charger = container_of(psy,
struct tps65090_charger, ac);
if (psp == POWER_SUPPLY_PROP_ONLINE) {
val->intval = charger->ac_online;
charger->prev_ac_online = charger->ac_online;
return 0;
}
return -EINVAL;
}
static irqreturn_t tps65090_charger_isr(int irq, void *dev_id)
{
struct tps65090_charger *charger = dev_id;
int ret;
uint8_t status1 = 0;
uint8_t intrsts = 0;
ret = tps65090_read(charger->dev->parent, TPS65090_REG_CG_STATUS1,
&status1);
if (ret < 0) {
dev_err(charger->dev, "%s(): Error in reading reg 0x%x\n",
__func__, TPS65090_REG_CG_STATUS1);
return IRQ_HANDLED;
}
msleep(75);
ret = tps65090_read(charger->dev->parent, TPS65090_REG_INTR_STS,
&intrsts);
if (ret < 0) {
dev_err(charger->dev, "%s(): Error in reading reg 0x%x\n",
__func__, TPS65090_REG_INTR_STS);
return IRQ_HANDLED;
}
if (intrsts & TPS65090_VACG) {
ret = tps65090_enable_charging(charger);
if (ret < 0)
return IRQ_HANDLED;
charger->ac_online = 1;
} else {
charger->ac_online = 0;
}
/* Clear interrupts. */
if (!charger->passive_mode) {
ret = tps65090_write(charger->dev->parent,
TPS65090_REG_INTR_STS, 0x00);
if (ret < 0) {
dev_err(charger->dev,
"%s(): Error in writing reg 0x%x\n",
__func__, TPS65090_REG_INTR_STS);
}
}
if (charger->prev_ac_online != charger->ac_online)
power_supply_changed(&charger->ac);
return IRQ_HANDLED;
}
static struct tps65090_platform_data *
tps65090_parse_dt_charger_data(struct platform_device *pdev)
{
struct tps65090_platform_data *pdata;
struct device_node *np = pdev->dev.of_node;
unsigned int prop;
pdata = devm_kzalloc(&pdev->dev, sizeof(*pdata), GFP_KERNEL);
if (!pdata) {
dev_err(&pdev->dev, "Memory alloc for tps65090_pdata failed\n");
return NULL;
}
prop = of_property_read_bool(np, "ti,enable-low-current-chrg");
pdata->enable_low_current_chrg = prop;
pdata->irq_base = -1;
return pdata;
}
static int tps65090_charger_poll_task(void *data)
{
set_freezable();
while (!kthread_should_stop()) {
schedule_timeout_interruptible(POLL_INTERVAL);
try_to_freeze();
tps65090_charger_isr(-1, data);
}
return 0;
}
static int tps65090_charger_probe(struct platform_device *pdev)
{
struct tps65090_charger *cdata;
struct tps65090_platform_data *pdata;
uint8_t status1 = 0;
int ret;
int irq;
pdata = dev_get_platdata(pdev->dev.parent);
if (IS_ENABLED(CONFIG_OF) && !pdata && pdev->dev.of_node)
pdata = tps65090_parse_dt_charger_data(pdev);
if (!pdata) {
dev_err(&pdev->dev, "%s():no platform data available\n",
__func__);
return -ENODEV;
}
cdata = devm_kzalloc(&pdev->dev, sizeof(*cdata), GFP_KERNEL);
if (!cdata) {
dev_err(&pdev->dev, "failed to allocate memory status\n");
return -ENOMEM;
}
platform_set_drvdata(pdev, cdata);
cdata->dev = &pdev->dev;
cdata->pdata = pdata;
cdata->ac.name = "tps65090-ac";
cdata->ac.type = POWER_SUPPLY_TYPE_MAINS;
cdata->ac.get_property = tps65090_ac_get_property;
cdata->ac.properties = tps65090_ac_props;
cdata->ac.num_properties = ARRAY_SIZE(tps65090_ac_props);
cdata->ac.supplied_to = pdata->supplied_to;
cdata->ac.num_supplicants = pdata->num_supplicants;
cdata->ac.of_node = pdev->dev.of_node;
ret = power_supply_register(&pdev->dev, &cdata->ac);
if (ret) {
dev_err(&pdev->dev, "failed: power supply register\n");
return ret;
}
irq = platform_get_irq(pdev, 0);
if (irq < 0)
irq = -ENXIO;
cdata->irq = irq;
ret = tps65090_config_charger(cdata);
if (ret < 0) {
dev_err(&pdev->dev, "charger config failed, err %d\n", ret);
goto fail_unregister_supply;
}
/* Check for charger presence */
ret = tps65090_read(cdata->dev->parent, TPS65090_REG_CG_STATUS1,
&status1);
if (ret < 0) {
dev_err(cdata->dev, "%s(): Error in reading reg 0x%x", __func__,
TPS65090_REG_CG_STATUS1);
goto fail_unregister_supply;
}
if (status1 != 0) {
ret = tps65090_enable_charging(cdata);
if (ret < 0) {
dev_err(cdata->dev, "error enabling charger\n");
goto fail_unregister_supply;
}
cdata->ac_online = 1;
power_supply_changed(&cdata->ac);
}
if (irq != -ENXIO) {
ret = devm_request_threaded_irq(&pdev->dev, irq, NULL,
tps65090_charger_isr, 0, "tps65090-charger", cdata);
if (ret) {
dev_err(cdata->dev,
"Unable to register irq %d err %d\n", irq,
ret);
goto fail_unregister_supply;
}
} else {
cdata->poll_task = kthread_run(tps65090_charger_poll_task,
cdata, "ktps65090charger");
cdata->passive_mode = true;
if (IS_ERR(cdata->poll_task)) {
ret = PTR_ERR(cdata->poll_task);
dev_err(cdata->dev,
"Unable to run kthread err %d\n", ret);
goto fail_unregister_supply;
}
}
return 0;
fail_unregister_supply:
power_supply_unregister(&cdata->ac);
return ret;
}
static int tps65090_charger_remove(struct platform_device *pdev)
{
struct tps65090_charger *cdata = platform_get_drvdata(pdev);
if (cdata->irq == -ENXIO)
kthread_stop(cdata->poll_task);
power_supply_unregister(&cdata->ac);
return 0;
}
static struct of_device_id of_tps65090_charger_match[] = {
{ .compatible = "ti,tps65090-charger", },
{ /* end */ }
};
static struct platform_driver tps65090_charger_driver = {
.driver = {
.name = "tps65090-charger",
.of_match_table = of_tps65090_charger_match,
},
.probe = tps65090_charger_probe,
.remove = tps65090_charger_remove,
};
module_platform_driver(tps65090_charger_driver);
MODULE_LICENSE("GPL v2");
MODULE_AUTHOR("Syed Rafiuddin <srafiuddin@nvidia.com>");
MODULE_DESCRIPTION("tps65090 battery charger driver");
