270 lines
6.8 KiB
C
270 lines
6.8 KiB
C
/*
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* Battery charger driver for TI's tps65217
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*
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* Copyright (c) 2015, Collabora Ltd.
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* This program is free software; you can redistribute it and/or modify it
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* under the terms and conditions of the GNU General Public License,
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* version 2, as published by the Free Software Foundation.
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* This program is distributed in the hope it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
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* more details.
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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/*
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* Battery charger driver for TI's tps65217
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*/
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#include <linux/kernel.h>
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#include <linux/kthread.h>
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#include <linux/device.h>
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#include <linux/module.h>
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#include <linux/platform_device.h>
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#include <linux/init.h>
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#include <linux/interrupt.h>
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#include <linux/slab.h>
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#include <linux/err.h>
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#include <linux/of.h>
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#include <linux/of_device.h>
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#include <linux/power_supply.h>
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#include <linux/mfd/core.h>
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#include <linux/mfd/tps65217.h>
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#define POLL_INTERVAL (HZ * 2)
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struct tps65217_charger {
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struct tps65217 *tps;
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struct device *dev;
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struct power_supply *ac;
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int ac_online;
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int prev_ac_online;
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struct task_struct *poll_task;
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};
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static enum power_supply_property tps65217_ac_props[] = {
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POWER_SUPPLY_PROP_ONLINE,
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};
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static int tps65217_config_charger(struct tps65217_charger *charger)
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{
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int ret;
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dev_dbg(charger->dev, "%s\n", __func__);
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/*
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* tps65217 rev. G, p. 31 (see p. 32 for NTC schematic)
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*
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* The device can be configured to support a 100k NTC (B = 3960) by
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* setting the the NTC_TYPE bit in register CHGCONFIG1 to 1. However it
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* is not recommended to do so. In sleep mode, the charger continues
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* charging the battery, but all register values are reset to default
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* values. Therefore, the charger would get the wrong temperature
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* information. If 100k NTC setting is required, please contact the
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* factory.
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*
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* ATTENTION, conflicting information, from p. 46
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*
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* NTC TYPE (for battery temperature measurement)
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* 0 – 100k (curve 1, B = 3960)
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* 1 – 10k (curve 2, B = 3480) (default on reset)
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*
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*/
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ret = tps65217_clear_bits(charger->tps, TPS65217_REG_CHGCONFIG1,
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TPS65217_CHGCONFIG1_NTC_TYPE,
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TPS65217_PROTECT_NONE);
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if (ret) {
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dev_err(charger->dev,
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"failed to set 100k NTC setting: %d\n", ret);
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return ret;
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}
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return 0;
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}
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static int tps65217_enable_charging(struct tps65217_charger *charger)
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{
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int ret;
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/* charger already enabled */
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if (charger->ac_online)
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return 0;
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dev_dbg(charger->dev, "%s: enable charging\n", __func__);
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ret = tps65217_set_bits(charger->tps, TPS65217_REG_CHGCONFIG1,
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TPS65217_CHGCONFIG1_CHG_EN,
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TPS65217_CHGCONFIG1_CHG_EN,
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TPS65217_PROTECT_NONE);
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if (ret) {
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dev_err(charger->dev,
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"%s: Error in writing CHG_EN in reg 0x%x: %d\n",
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__func__, TPS65217_REG_CHGCONFIG1, ret);
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return ret;
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}
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charger->ac_online = 1;
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return 0;
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}
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static int tps65217_ac_get_property(struct power_supply *psy,
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enum power_supply_property psp,
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union power_supply_propval *val)
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{
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struct tps65217_charger *charger = power_supply_get_drvdata(psy);
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if (psp == POWER_SUPPLY_PROP_ONLINE) {
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val->intval = charger->ac_online;
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return 0;
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}
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return -EINVAL;
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}
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static irqreturn_t tps65217_charger_irq(int irq, void *dev)
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{
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int ret, val;
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struct tps65217_charger *charger = dev;
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charger->prev_ac_online = charger->ac_online;
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ret = tps65217_reg_read(charger->tps, TPS65217_REG_STATUS, &val);
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if (ret < 0) {
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dev_err(charger->dev, "%s: Error in reading reg 0x%x\n",
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__func__, TPS65217_REG_STATUS);
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return IRQ_HANDLED;
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}
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dev_dbg(charger->dev, "%s: 0x%x\n", __func__, val);
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/* check for AC status bit */
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if (val & TPS65217_STATUS_ACPWR) {
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ret = tps65217_enable_charging(charger);
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if (ret) {
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dev_err(charger->dev,
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"failed to enable charger: %d\n", ret);
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return IRQ_HANDLED;
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}
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} else {
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charger->ac_online = 0;
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}
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if (charger->prev_ac_online != charger->ac_online)
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power_supply_changed(charger->ac);
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ret = tps65217_reg_read(charger->tps, TPS65217_REG_CHGCONFIG0, &val);
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if (ret < 0) {
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dev_err(charger->dev, "%s: Error in reading reg 0x%x\n",
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__func__, TPS65217_REG_CHGCONFIG0);
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return IRQ_HANDLED;
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}
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if (val & TPS65217_CHGCONFIG0_ACTIVE)
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dev_dbg(charger->dev, "%s: charger is charging\n", __func__);
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else
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dev_dbg(charger->dev,
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"%s: charger is NOT charging\n", __func__);
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return IRQ_HANDLED;
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}
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static int tps65217_charger_poll_task(void *data)
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{
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set_freezable();
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while (!kthread_should_stop()) {
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schedule_timeout_interruptible(POLL_INTERVAL);
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try_to_freeze();
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tps65217_charger_irq(-1, data);
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}
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return 0;
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}
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static const struct power_supply_desc tps65217_charger_desc = {
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.name = "tps65217-ac",
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.type = POWER_SUPPLY_TYPE_MAINS,
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.get_property = tps65217_ac_get_property,
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.properties = tps65217_ac_props,
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.num_properties = ARRAY_SIZE(tps65217_ac_props),
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};
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static int tps65217_charger_probe(struct platform_device *pdev)
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{
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struct tps65217 *tps = dev_get_drvdata(pdev->dev.parent);
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struct tps65217_charger *charger;
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struct power_supply_config cfg = {};
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int ret;
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dev_dbg(&pdev->dev, "%s\n", __func__);
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charger = devm_kzalloc(&pdev->dev, sizeof(*charger), GFP_KERNEL);
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if (!charger)
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return -ENOMEM;
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platform_set_drvdata(pdev, charger);
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charger->tps = tps;
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charger->dev = &pdev->dev;
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cfg.of_node = pdev->dev.of_node;
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cfg.drv_data = charger;
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charger->ac = devm_power_supply_register(&pdev->dev,
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&tps65217_charger_desc,
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&cfg);
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if (IS_ERR(charger->ac)) {
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dev_err(&pdev->dev, "failed: power supply register\n");
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return PTR_ERR(charger->ac);
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}
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ret = tps65217_config_charger(charger);
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if (ret < 0) {
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dev_err(charger->dev, "charger config failed, err %d\n", ret);
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return ret;
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}
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charger->poll_task = kthread_run(tps65217_charger_poll_task,
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charger, "ktps65217charger");
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if (IS_ERR(charger->poll_task)) {
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ret = PTR_ERR(charger->poll_task);
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dev_err(charger->dev, "Unable to run kthread err %d\n", ret);
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return ret;
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}
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return 0;
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}
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static int tps65217_charger_remove(struct platform_device *pdev)
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{
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struct tps65217_charger *charger = platform_get_drvdata(pdev);
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kthread_stop(charger->poll_task);
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return 0;
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}
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static const struct of_device_id tps65217_charger_match_table[] = {
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{ .compatible = "ti,tps65217-charger", },
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{ /* sentinel */ }
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};
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MODULE_DEVICE_TABLE(of, tps65217_charger_match_table);
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static struct platform_driver tps65217_charger_driver = {
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.probe = tps65217_charger_probe,
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.remove = tps65217_charger_remove,
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.driver = {
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.name = "tps65217-charger",
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.of_match_table = of_match_ptr(tps65217_charger_match_table),
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},
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};
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module_platform_driver(tps65217_charger_driver);
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MODULE_LICENSE("GPL v2");
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MODULE_AUTHOR("Enric Balletbo Serra <enric.balletbo@collabora.com>");
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MODULE_DESCRIPTION("TPS65217 battery charger driver");
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