2
0
mirror of https://github.com/edk2-porting/linux-next.git synced 2024-12-25 05:34:00 +08:00
linux-next/drivers/power/supply/tps65217_charger.c
Sebastian Reichel f7c8f1de03 Power Supply Fixes for 4.8 cycle
-----BEGIN PGP SIGNATURE-----
 Version: GnuPG v1
 
 iQIcBAABCgAGBQJXsk2BAAoJENju1/PIO/qa0E4P/0rsS4Kzv+B61BJsoCIoXYOp
 p347gy6fS7QEJxSlHG430uVV74zlXQE3JTiBrjIdX2TKRA6EvD0RyM3/h+vfQU1c
 GviBJ53UwNlq1bBuJD1jkIHCvIW274FjX1h45Tytuzsi/8rLWas15oumnRFuOtyA
 UtgTbPtualYab01XgQyivv/dY4Dfb3d0aNPl3Nq77hAJMTVc9s1DLVqRMudqc0Zc
 e489mw+8l31L2pJs7CPxzNXqlS4YvMz4/mwbGCsqtEJTNHyzyrVH5VfCpMUNfGr4
 rZdqtF/nj/9c/DTIO6GvhoOVjja4MCEf3WpGCxrz2KUmhvxVTeBqsPStjE1xnC8u
 rNDDpRAwtjgpiw8fiEw+CXB5XsDMPmMSJi1KaOLz1q9O2GxHzoz2tgfjCh9V73qj
 J5pq1cQY2V6AkB+10WQ7afCnN3Zn2qDUoWXj2cvkd8yuvyfjTuC53Gd1sGpNk1dj
 f+euFLm6YYMvLv37vDCQDaxvzmud1Z60bgJy/uvbaVhcCABLUdbfwJpRf/3tWjp3
 rU3Lw43p5MPfBWHkZrzpQO33GEzO6FSrIkTr3YfVJiwAoViXgt5WEknbVde/pZDz
 Acn8UTE+6KeLrmrwA66pF++ewKjA7GgUzW50Ubju15rWujnwu5QVg/T+UVpGrB4k
 OYmwCtd5i2/OjnC+APnK
 =hK7R
 -----END PGP SIGNATURE-----

Merge tag 'for-v4.8-rc' into psy-next

Power Supply Fixes for 4.8 cycle
2016-08-16 01:17:42 +02:00

296 lines
7.3 KiB
C
Raw Blame History

This file contains ambiguous Unicode characters

This file contains Unicode characters that might be confused with other characters. If you think that this is intentional, you can safely ignore this warning. Use the Escape button to reveal them.

/*
* Battery charger driver for TI's tps65217
*
* Copyright (c) 2015, Collabora Ltd.
* 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/>.
*/
/*
* Battery charger driver for TI's tps65217
*/
#include <linux/kernel.h>
#include <linux/kthread.h>
#include <linux/device.h>
#include <linux/module.h>
#include <linux/platform_device.h>
#include <linux/init.h>
#include <linux/interrupt.h>
#include <linux/slab.h>
#include <linux/err.h>
#include <linux/of.h>
#include <linux/of_device.h>
#include <linux/power_supply.h>
#include <linux/mfd/core.h>
#include <linux/mfd/tps65217.h>
#define POLL_INTERVAL (HZ * 2)
struct tps65217_charger {
struct tps65217 *tps;
struct device *dev;
struct power_supply *ac;
int ac_online;
int prev_ac_online;
struct task_struct *poll_task;
int irq;
};
static enum power_supply_property tps65217_ac_props[] = {
POWER_SUPPLY_PROP_ONLINE,
};
static int tps65217_config_charger(struct tps65217_charger *charger)
{
int ret;
dev_dbg(charger->dev, "%s\n", __func__);
/*
* tps65217 rev. G, p. 31 (see p. 32 for NTC schematic)
*
* The device can be configured to support a 100k NTC (B = 3960) by
* setting the the NTC_TYPE bit in register CHGCONFIG1 to 1. However it
* is not recommended to do so. In sleep mode, the charger continues
* charging the battery, but all register values are reset to default
* values. Therefore, the charger would get the wrong temperature
* information. If 100k NTC setting is required, please contact the
* factory.
*
* ATTENTION, conflicting information, from p. 46
*
* NTC TYPE (for battery temperature measurement)
* 0 100k (curve 1, B = 3960)
* 1 10k (curve 2, B = 3480) (default on reset)
*
*/
ret = tps65217_clear_bits(charger->tps, TPS65217_REG_CHGCONFIG1,
TPS65217_CHGCONFIG1_NTC_TYPE,
TPS65217_PROTECT_NONE);
if (ret) {
dev_err(charger->dev,
"failed to set 100k NTC setting: %d\n", ret);
return ret;
}
return 0;
}
static int tps65217_enable_charging(struct tps65217_charger *charger)
{
int ret;
/* charger already enabled */
if (charger->ac_online)
return 0;
dev_dbg(charger->dev, "%s: enable charging\n", __func__);
ret = tps65217_set_bits(charger->tps, TPS65217_REG_CHGCONFIG1,
TPS65217_CHGCONFIG1_CHG_EN,
TPS65217_CHGCONFIG1_CHG_EN,
TPS65217_PROTECT_NONE);
if (ret) {
dev_err(charger->dev,
"%s: Error in writing CHG_EN in reg 0x%x: %d\n",
__func__, TPS65217_REG_CHGCONFIG1, ret);
return ret;
}
charger->ac_online = 1;
return 0;
}
static int tps65217_ac_get_property(struct power_supply *psy,
enum power_supply_property psp,
union power_supply_propval *val)
{
struct tps65217_charger *charger = power_supply_get_drvdata(psy);
if (psp == POWER_SUPPLY_PROP_ONLINE) {
val->intval = charger->ac_online;
return 0;
}
return -EINVAL;
}
static irqreturn_t tps65217_charger_irq(int irq, void *dev)
{
int ret, val;
struct tps65217_charger *charger = dev;
charger->prev_ac_online = charger->ac_online;
ret = tps65217_reg_read(charger->tps, TPS65217_REG_STATUS, &val);
if (ret < 0) {
dev_err(charger->dev, "%s: Error in reading reg 0x%x\n",
__func__, TPS65217_REG_STATUS);
return IRQ_HANDLED;
}
dev_dbg(charger->dev, "%s: 0x%x\n", __func__, val);
/* check for AC status bit */
if (val & TPS65217_STATUS_ACPWR) {
ret = tps65217_enable_charging(charger);
if (ret) {
dev_err(charger->dev,
"failed to enable charger: %d\n", ret);
return IRQ_HANDLED;
}
} else {
charger->ac_online = 0;
}
if (charger->prev_ac_online != charger->ac_online)
power_supply_changed(charger->ac);
ret = tps65217_reg_read(charger->tps, TPS65217_REG_CHGCONFIG0, &val);
if (ret < 0) {
dev_err(charger->dev, "%s: Error in reading reg 0x%x\n",
__func__, TPS65217_REG_CHGCONFIG0);
return IRQ_HANDLED;
}
if (val & TPS65217_CHGCONFIG0_ACTIVE)
dev_dbg(charger->dev, "%s: charger is charging\n", __func__);
else
dev_dbg(charger->dev,
"%s: charger is NOT charging\n", __func__);
return IRQ_HANDLED;
}
static int tps65217_charger_poll_task(void *data)
{
set_freezable();
while (!kthread_should_stop()) {
schedule_timeout_interruptible(POLL_INTERVAL);
try_to_freeze();
tps65217_charger_irq(-1, data);
}
return 0;
}
static const struct power_supply_desc tps65217_charger_desc = {
.name = "tps65217-ac",
.type = POWER_SUPPLY_TYPE_MAINS,
.get_property = tps65217_ac_get_property,
.properties = tps65217_ac_props,
.num_properties = ARRAY_SIZE(tps65217_ac_props),
};
static int tps65217_charger_probe(struct platform_device *pdev)
{
struct tps65217 *tps = dev_get_drvdata(pdev->dev.parent);
struct tps65217_charger *charger;
struct power_supply_config cfg = {};
int irq;
int ret;
dev_dbg(&pdev->dev, "%s\n", __func__);
charger = devm_kzalloc(&pdev->dev, sizeof(*charger), GFP_KERNEL);
if (!charger)
return -ENOMEM;
platform_set_drvdata(pdev, charger);
charger->tps = tps;
charger->dev = &pdev->dev;
cfg.of_node = pdev->dev.of_node;
cfg.drv_data = charger;
charger->ac = devm_power_supply_register(&pdev->dev,
&tps65217_charger_desc,
&cfg);
if (IS_ERR(charger->ac)) {
dev_err(&pdev->dev, "failed: power supply register\n");
return PTR_ERR(charger->ac);
}
irq = platform_get_irq_byname(pdev, "AC");
if (irq < 0)
irq = -ENXIO;
charger->irq = irq;
ret = tps65217_config_charger(charger);
if (ret < 0) {
dev_err(charger->dev, "charger config failed, err %d\n", ret);
return ret;
}
if (irq != -ENXIO) {
ret = devm_request_threaded_irq(&pdev->dev, irq, NULL,
tps65217_charger_irq,
0, "tps65217-charger",
charger);
if (ret) {
dev_err(charger->dev,
"Unable to register irq %d err %d\n", irq,
ret);
return ret;
}
/* Check current state */
tps65217_charger_irq(irq, charger);
} else {
charger->poll_task = kthread_run(tps65217_charger_poll_task,
charger, "ktps65217charger");
if (IS_ERR(charger->poll_task)) {
ret = PTR_ERR(charger->poll_task);
dev_err(charger->dev,
"Unable to run kthread err %d\n", ret);
return ret;
}
}
return 0;
}
static int tps65217_charger_remove(struct platform_device *pdev)
{
struct tps65217_charger *charger = platform_get_drvdata(pdev);
if (charger->irq == -ENXIO)
kthread_stop(charger->poll_task);
return 0;
}
static const struct of_device_id tps65217_charger_match_table[] = {
{ .compatible = "ti,tps65217-charger", },
{ /* sentinel */ }
};
MODULE_DEVICE_TABLE(of, tps65217_charger_match_table);
static struct platform_driver tps65217_charger_driver = {
.probe = tps65217_charger_probe,
.remove = tps65217_charger_remove,
.driver = {
.name = "tps65217-charger",
.of_match_table = of_match_ptr(tps65217_charger_match_table),
},
};
module_platform_driver(tps65217_charger_driver);
MODULE_LICENSE("GPL v2");
MODULE_AUTHOR("Enric Balletbo Serra <enric.balletbo@collabora.com>");
MODULE_DESCRIPTION("TPS65217 battery charger driver");