![Enric Balletbo i Serra](/assets/img/avatar_default.png)
Equivalent information can be nowadays obtained using function tracer. Signed-off-by: Enric Balletbo i Serra <enric.balletbo@collabora.com> Signed-off-by: Sebastian Reichel <sre@kernel.org>
299 lines
7.6 KiB
C
299 lines
7.6 KiB
C
/*
|
||
* 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 CHARGER_STATUS_PRESENT (TPS65217_STATUS_ACPWR | TPS65217_STATUS_USBPWR)
|
||
#define NUM_CHARGER_IRQS 2
|
||
#define POLL_INTERVAL (HZ * 2)
|
||
|
||
struct tps65217_charger {
|
||
struct tps65217 *tps;
|
||
struct device *dev;
|
||
struct power_supply *psy;
|
||
|
||
int online;
|
||
int prev_online;
|
||
|
||
struct task_struct *poll_task;
|
||
};
|
||
|
||
static enum power_supply_property tps65217_charger_props[] = {
|
||
POWER_SUPPLY_PROP_ONLINE,
|
||
};
|
||
|
||
static int tps65217_config_charger(struct tps65217_charger *charger)
|
||
{
|
||
int ret;
|
||
|
||
/*
|
||
* 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->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->online = 1;
|
||
|
||
return 0;
|
||
}
|
||
|
||
static int tps65217_charger_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->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_online = charger->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 charger status bit */
|
||
if (val & CHARGER_STATUS_PRESENT) {
|
||
ret = tps65217_enable_charging(charger);
|
||
if (ret) {
|
||
dev_err(charger->dev,
|
||
"failed to enable charger: %d\n", ret);
|
||
return IRQ_HANDLED;
|
||
}
|
||
} else {
|
||
charger->online = 0;
|
||
}
|
||
|
||
if (charger->prev_online != charger->online)
|
||
power_supply_changed(charger->psy);
|
||
|
||
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-charger",
|
||
.type = POWER_SUPPLY_TYPE_MAINS,
|
||
.get_property = tps65217_charger_get_property,
|
||
.properties = tps65217_charger_props,
|
||
.num_properties = ARRAY_SIZE(tps65217_charger_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 = {};
|
||
struct task_struct *poll_task;
|
||
int irq[NUM_CHARGER_IRQS];
|
||
int ret;
|
||
int i;
|
||
|
||
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->psy = devm_power_supply_register(&pdev->dev,
|
||
&tps65217_charger_desc,
|
||
&cfg);
|
||
if (IS_ERR(charger->psy)) {
|
||
dev_err(&pdev->dev, "failed: power supply register\n");
|
||
return PTR_ERR(charger->psy);
|
||
}
|
||
|
||
irq[0] = platform_get_irq_byname(pdev, "USB");
|
||
irq[1] = platform_get_irq_byname(pdev, "AC");
|
||
|
||
ret = tps65217_config_charger(charger);
|
||
if (ret < 0) {
|
||
dev_err(charger->dev, "charger config failed, err %d\n", ret);
|
||
return ret;
|
||
}
|
||
|
||
/* Create a polling thread if an interrupt is invalid */
|
||
if (irq[0] < 0 || irq[1] < 0) {
|
||
poll_task = kthread_run(tps65217_charger_poll_task,
|
||
charger, "ktps65217charger");
|
||
if (IS_ERR(poll_task)) {
|
||
ret = PTR_ERR(poll_task);
|
||
dev_err(charger->dev,
|
||
"Unable to run kthread err %d\n", ret);
|
||
return ret;
|
||
}
|
||
|
||
charger->poll_task = poll_task;
|
||
return 0;
|
||
}
|
||
|
||
/* Create IRQ threads for charger interrupts */
|
||
for (i = 0; i < NUM_CHARGER_IRQS; i++) {
|
||
ret = devm_request_threaded_irq(&pdev->dev, irq[i], NULL,
|
||
tps65217_charger_irq,
|
||
0, "tps65217-charger",
|
||
charger);
|
||
if (ret) {
|
||
dev_err(charger->dev,
|
||
"Unable to register irq %d err %d\n", irq[i],
|
||
ret);
|
||
return ret;
|
||
}
|
||
|
||
/* Check current state */
|
||
tps65217_charger_irq(-1, charger);
|
||
}
|
||
|
||
return 0;
|
||
}
|
||
|
||
static int tps65217_charger_remove(struct platform_device *pdev)
|
||
{
|
||
struct tps65217_charger *charger = platform_get_drvdata(pdev);
|
||
|
||
if (charger->poll_task)
|
||
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");
|