366 lines
8.9 KiB
C
Executable File
366 lines
8.9 KiB
C
Executable File
/*
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* Battery charger driver for TI's tps65090
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*
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* Copyright (c) 2013, NVIDIA CORPORATION. All rights reserved.
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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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#include <linux/delay.h>
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#include <linux/err.h>
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#include <linux/freezer.h>
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#include <linux/init.h>
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#include <linux/interrupt.h>
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#include <linux/kernel.h>
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#include <linux/kthread.h>
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#include <linux/module.h>
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#include <linux/of_device.h>
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#include <linux/platform_device.h>
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#include <linux/power_supply.h>
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#include <linux/slab.h>
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#include <linux/mfd/tps65090.h>
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#define TPS65090_CHARGER_ENABLE BIT(0)
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#define TPS65090_VACG BIT(1)
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#define TPS65090_NOITERM BIT(5)
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#define POLL_INTERVAL (HZ * 2) /* Used when no irq */
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struct tps65090_charger {
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struct device *dev;
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int ac_online;
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int prev_ac_online;
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int irq;
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struct task_struct *poll_task;
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bool passive_mode;
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struct power_supply ac;
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struct tps65090_platform_data *pdata;
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};
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static enum power_supply_property tps65090_ac_props[] = {
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POWER_SUPPLY_PROP_ONLINE,
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};
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static int tps65090_low_chrg_current(struct tps65090_charger *charger)
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{
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int ret;
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if (charger->passive_mode)
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return 0;
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ret = tps65090_write(charger->dev->parent, TPS65090_REG_CG_CTRL5,
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TPS65090_NOITERM);
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if (ret < 0) {
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dev_err(charger->dev, "%s(): error reading in register 0x%x\n",
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__func__, TPS65090_REG_CG_CTRL5);
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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 tps65090_enable_charging(struct tps65090_charger *charger)
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{
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int ret;
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uint8_t ctrl0 = 0;
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if (charger->passive_mode)
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return 0;
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ret = tps65090_read(charger->dev->parent, TPS65090_REG_CG_CTRL0,
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&ctrl0);
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if (ret < 0) {
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dev_err(charger->dev, "%s(): error reading in register 0x%x\n",
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__func__, TPS65090_REG_CG_CTRL0);
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return ret;
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}
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ret = tps65090_write(charger->dev->parent, TPS65090_REG_CG_CTRL0,
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(ctrl0 | TPS65090_CHARGER_ENABLE));
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if (ret < 0) {
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dev_err(charger->dev, "%s(): error writing in register 0x%x\n",
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__func__, TPS65090_REG_CG_CTRL0);
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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 tps65090_config_charger(struct tps65090_charger *charger)
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{
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uint8_t intrmask = 0;
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int ret;
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if (charger->passive_mode)
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return 0;
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if (charger->pdata->enable_low_current_chrg) {
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ret = tps65090_low_chrg_current(charger);
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if (ret < 0) {
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dev_err(charger->dev,
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"error configuring low charge current\n");
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return ret;
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}
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}
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/* Enable the VACG interrupt for AC power detect */
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ret = tps65090_read(charger->dev->parent, TPS65090_REG_INTR_MASK,
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&intrmask);
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if (ret < 0) {
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dev_err(charger->dev, "%s(): error reading in register 0x%x\n",
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__func__, TPS65090_REG_INTR_MASK);
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return ret;
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}
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ret = tps65090_write(charger->dev->parent, TPS65090_REG_INTR_MASK,
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(intrmask | TPS65090_VACG));
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if (ret < 0) {
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dev_err(charger->dev, "%s(): error writing in register 0x%x\n",
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__func__, TPS65090_REG_CG_CTRL0);
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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 tps65090_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 tps65090_charger *charger = container_of(psy,
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struct tps65090_charger, ac);
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if (psp == POWER_SUPPLY_PROP_ONLINE) {
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val->intval = charger->ac_online;
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charger->prev_ac_online = 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 tps65090_charger_isr(int irq, void *dev_id)
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{
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struct tps65090_charger *charger = dev_id;
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int ret;
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uint8_t status1 = 0;
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uint8_t intrsts = 0;
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ret = tps65090_read(charger->dev->parent, TPS65090_REG_CG_STATUS1,
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&status1);
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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__, TPS65090_REG_CG_STATUS1);
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return IRQ_HANDLED;
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}
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msleep(75);
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ret = tps65090_read(charger->dev->parent, TPS65090_REG_INTR_STS,
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&intrsts);
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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__, TPS65090_REG_INTR_STS);
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return IRQ_HANDLED;
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}
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if (intrsts & TPS65090_VACG) {
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ret = tps65090_enable_charging(charger);
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if (ret < 0)
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return IRQ_HANDLED;
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charger->ac_online = 1;
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} else {
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charger->ac_online = 0;
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}
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/* Clear interrupts. */
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if (!charger->passive_mode) {
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ret = tps65090_write(charger->dev->parent,
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TPS65090_REG_INTR_STS, 0x00);
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if (ret < 0) {
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dev_err(charger->dev,
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"%s(): Error in writing reg 0x%x\n",
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__func__, TPS65090_REG_INTR_STS);
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}
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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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return IRQ_HANDLED;
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}
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static struct tps65090_platform_data *
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tps65090_parse_dt_charger_data(struct platform_device *pdev)
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{
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struct tps65090_platform_data *pdata;
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struct device_node *np = pdev->dev.of_node;
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unsigned int prop;
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pdata = devm_kzalloc(&pdev->dev, sizeof(*pdata), GFP_KERNEL);
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if (!pdata) {
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dev_err(&pdev->dev, "Memory alloc for tps65090_pdata failed\n");
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return NULL;
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}
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prop = of_property_read_bool(np, "ti,enable-low-current-chrg");
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pdata->enable_low_current_chrg = prop;
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pdata->irq_base = -1;
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return pdata;
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}
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static int tps65090_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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tps65090_charger_isr(-1, data);
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}
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return 0;
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}
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static int tps65090_charger_probe(struct platform_device *pdev)
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{
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struct tps65090_charger *cdata;
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struct tps65090_platform_data *pdata;
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uint8_t status1 = 0;
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int ret;
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int irq;
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pdata = dev_get_platdata(pdev->dev.parent);
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if (IS_ENABLED(CONFIG_OF) && !pdata && pdev->dev.of_node)
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pdata = tps65090_parse_dt_charger_data(pdev);
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if (!pdata) {
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dev_err(&pdev->dev, "%s():no platform data available\n",
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__func__);
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return -ENODEV;
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}
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cdata = devm_kzalloc(&pdev->dev, sizeof(*cdata), GFP_KERNEL);
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if (!cdata) {
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dev_err(&pdev->dev, "failed to allocate memory status\n");
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return -ENOMEM;
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}
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platform_set_drvdata(pdev, cdata);
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cdata->dev = &pdev->dev;
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cdata->pdata = pdata;
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cdata->ac.name = "tps65090-ac";
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cdata->ac.type = POWER_SUPPLY_TYPE_MAINS;
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cdata->ac.get_property = tps65090_ac_get_property;
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cdata->ac.properties = tps65090_ac_props;
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cdata->ac.num_properties = ARRAY_SIZE(tps65090_ac_props);
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cdata->ac.supplied_to = pdata->supplied_to;
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cdata->ac.num_supplicants = pdata->num_supplicants;
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cdata->ac.of_node = pdev->dev.of_node;
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ret = power_supply_register(&pdev->dev, &cdata->ac);
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if (ret) {
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dev_err(&pdev->dev, "failed: power supply register\n");
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return ret;
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}
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irq = platform_get_irq(pdev, 0);
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if (irq < 0)
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irq = -ENXIO;
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cdata->irq = irq;
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ret = tps65090_config_charger(cdata);
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if (ret < 0) {
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dev_err(&pdev->dev, "charger config failed, err %d\n", ret);
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goto fail_unregister_supply;
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}
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/* Check for charger presence */
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ret = tps65090_read(cdata->dev->parent, TPS65090_REG_CG_STATUS1,
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&status1);
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if (ret < 0) {
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dev_err(cdata->dev, "%s(): Error in reading reg 0x%x", __func__,
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TPS65090_REG_CG_STATUS1);
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goto fail_unregister_supply;
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}
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if (status1 != 0) {
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ret = tps65090_enable_charging(cdata);
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if (ret < 0) {
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dev_err(cdata->dev, "error enabling charger\n");
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goto fail_unregister_supply;
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}
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cdata->ac_online = 1;
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power_supply_changed(&cdata->ac);
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}
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if (irq != -ENXIO) {
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ret = devm_request_threaded_irq(&pdev->dev, irq, NULL,
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tps65090_charger_isr, 0, "tps65090-charger", cdata);
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if (ret) {
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dev_err(cdata->dev,
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"Unable to register irq %d err %d\n", irq,
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ret);
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goto fail_unregister_supply;
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}
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} else {
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cdata->poll_task = kthread_run(tps65090_charger_poll_task,
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cdata, "ktps65090charger");
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cdata->passive_mode = true;
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if (IS_ERR(cdata->poll_task)) {
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ret = PTR_ERR(cdata->poll_task);
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dev_err(cdata->dev,
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"Unable to run kthread err %d\n", ret);
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goto fail_unregister_supply;
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}
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}
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return 0;
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fail_unregister_supply:
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power_supply_unregister(&cdata->ac);
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return ret;
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}
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static int tps65090_charger_remove(struct platform_device *pdev)
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{
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struct tps65090_charger *cdata = platform_get_drvdata(pdev);
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if (cdata->irq == -ENXIO)
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kthread_stop(cdata->poll_task);
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power_supply_unregister(&cdata->ac);
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return 0;
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}
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static struct of_device_id of_tps65090_charger_match[] = {
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{ .compatible = "ti,tps65090-charger", },
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{ /* end */ }
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};
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static struct platform_driver tps65090_charger_driver = {
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.driver = {
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.name = "tps65090-charger",
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.of_match_table = of_tps65090_charger_match,
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.owner = THIS_MODULE,
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},
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.probe = tps65090_charger_probe,
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.remove = tps65090_charger_remove,
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};
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module_platform_driver(tps65090_charger_driver);
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MODULE_LICENSE("GPL v2");
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MODULE_AUTHOR("Syed Rafiuddin <srafiuddin@nvidia.com>");
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MODULE_DESCRIPTION("tps65090 battery charger driver");
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