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linux/drivers/power/tps65090-charger.c
Andrew Chew e24142178f tps65090-charger: Fix AC detect 
The VACG interrupt was not being enabled.  Thus, interrupts were never
generated when AC status changes.  In addition, interrupts were never
cleared after taking and processing the interrupt.

Added the register offset for the INTR_MASK register, since this is needed
to unmask the VACG interrupt.

Enabled the VACG interrupt in tps65090_config_charger().

Cleared interrupts after processing, in tps65090_charger_isr().

Also removed unused variable "enable" in tps65090_enable_charging(), and
fixed a typo in one of the dev_err() prints.

Signed-off-by: Andrew Chew <achew@nvidia.com>
Tested-by: Rhyland Klein <rklein@nvidia.com>
Acked-by: Rhyland Klein <rklein@nvidia.com>
Signed-off-by: Anton Vorontsov <anton@enomsg.org>
2013-06-09 10:07:34 -07:00

346 lines
8.6 KiB
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/*
* 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/err.h>
#include <linux/init.h>
#include <linux/interrupt.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/slab.h>
#include <linux/delay.h>
#include <linux/platform_device.h>
#include <linux/power_supply.h>
#include <linux/mfd/tps65090.h>
#define TPS65090_REG_INTR_STS 0x00
#define TPS65090_REG_INTR_MASK 0x02
#define TPS65090_REG_CG_CTRL0 0x04
#define TPS65090_REG_CG_CTRL1 0x05
#define TPS65090_REG_CG_CTRL2 0x06
#define TPS65090_REG_CG_CTRL3 0x07
#define TPS65090_REG_CG_CTRL4 0x08
#define TPS65090_REG_CG_CTRL5 0x09
#define TPS65090_REG_CG_STATUS1 0x0a
#define TPS65090_REG_CG_STATUS2 0x0b
#define TPS65090_CHARGER_ENABLE BIT(0)
#define TPS65090_VACG BIT(1)
#define TPS65090_NOITERM BIT(5)
struct tps65090_charger {
struct device *dev;
int ac_online;
int prev_ac_online;
int irq;
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;
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;
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->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. */
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;
}
#if defined(CONFIG_OF)
#include <linux/of_device.h>
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;
}
#else
static struct tps65090_platform_data *
tps65090_parse_dt_charger_data(struct platform_device *pdev)
{
return NULL;
}
#endif
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 (!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;
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) {
dev_warn(&pdev->dev, "Unable to get charger irq = %d\n", irq);
ret = irq;
goto fail_unregister_supply;
}
cdata->irq = irq;
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_free_irq;
}
ret = tps65090_config_charger(cdata);
if (ret < 0) {
dev_err(&pdev->dev, "charger config failed, err %d\n", ret);
goto fail_free_irq;
}
/* 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_free_irq;
}
if (status1 != 0) {
ret = tps65090_enable_charging(cdata);
if (ret < 0) {
dev_err(cdata->dev, "error enabling charger\n");
goto fail_free_irq;
}
cdata->ac_online = 1;
power_supply_changed(&cdata->ac);
}
return 0;
fail_free_irq:
devm_free_irq(cdata->dev, irq, cdata);
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);
devm_free_irq(cdata->dev, cdata->irq, cdata);
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,
.owner = THIS_MODULE,
},
.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");
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