501 lines
12 KiB
C
501 lines
12 KiB
C
/*
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* Battery charger driver for TI BQ24735
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*
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* Copyright (c) 2013, NVIDIA CORPORATION. All rights reserved.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation;
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*
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* This program is distributed in the hope that 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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*
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* You should have received a copy of the GNU General Public License along
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* with this program; if not, write to the Free Software Foundation, Inc.,
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* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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*/
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#include <linux/err.h>
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#include <linux/gpio.h>
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#include <linux/i2c.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/module.h>
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#include <linux/of.h>
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#include <linux/of_gpio.h>
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#include <linux/power_supply.h>
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#include <linux/slab.h>
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#include <linux/power/bq24735-charger.h>
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#define BQ24735_CHG_OPT 0x12
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#define BQ24735_CHG_OPT_CHARGE_DISABLE (1 << 0)
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#define BQ24735_CHG_OPT_AC_PRESENT (1 << 4)
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#define BQ24735_CHARGE_CURRENT 0x14
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#define BQ24735_CHARGE_CURRENT_MASK 0x1fc0
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#define BQ24735_CHARGE_VOLTAGE 0x15
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#define BQ24735_CHARGE_VOLTAGE_MASK 0x7ff0
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#define BQ24735_INPUT_CURRENT 0x3f
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#define BQ24735_INPUT_CURRENT_MASK 0x1f80
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#define BQ24735_MANUFACTURER_ID 0xfe
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#define BQ24735_DEVICE_ID 0xff
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struct bq24735 {
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struct power_supply *charger;
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struct power_supply_desc charger_desc;
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struct i2c_client *client;
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struct bq24735_platform *pdata;
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struct mutex lock;
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bool charging;
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};
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static inline struct bq24735 *to_bq24735(struct power_supply *psy)
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{
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return power_supply_get_drvdata(psy);
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}
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static enum power_supply_property bq24735_charger_properties[] = {
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POWER_SUPPLY_PROP_STATUS,
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POWER_SUPPLY_PROP_ONLINE,
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};
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static int bq24735_charger_property_is_writeable(struct power_supply *psy,
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enum power_supply_property psp)
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{
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switch (psp) {
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case POWER_SUPPLY_PROP_STATUS:
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return 1;
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default:
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break;
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}
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return 0;
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}
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static inline int bq24735_write_word(struct i2c_client *client, u8 reg,
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u16 value)
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{
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return i2c_smbus_write_word_data(client, reg, le16_to_cpu(value));
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}
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static inline int bq24735_read_word(struct i2c_client *client, u8 reg)
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{
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s32 ret = i2c_smbus_read_word_data(client, reg);
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return ret < 0 ? ret : le16_to_cpu(ret);
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}
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static int bq24735_update_word(struct i2c_client *client, u8 reg,
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u16 mask, u16 value)
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{
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unsigned int tmp;
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int ret;
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ret = bq24735_read_word(client, reg);
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if (ret < 0)
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return ret;
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tmp = ret & ~mask;
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tmp |= value & mask;
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return bq24735_write_word(client, reg, tmp);
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}
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static inline int bq24735_enable_charging(struct bq24735 *charger)
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{
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if (charger->pdata->ext_control)
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return 0;
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return bq24735_update_word(charger->client, BQ24735_CHG_OPT,
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BQ24735_CHG_OPT_CHARGE_DISABLE,
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~BQ24735_CHG_OPT_CHARGE_DISABLE);
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}
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static inline int bq24735_disable_charging(struct bq24735 *charger)
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{
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if (charger->pdata->ext_control)
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return 0;
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return bq24735_update_word(charger->client, BQ24735_CHG_OPT,
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BQ24735_CHG_OPT_CHARGE_DISABLE,
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BQ24735_CHG_OPT_CHARGE_DISABLE);
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}
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static int bq24735_config_charger(struct bq24735 *charger)
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{
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struct bq24735_platform *pdata = charger->pdata;
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int ret;
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u16 value;
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if (pdata->ext_control)
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return 0;
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if (pdata->charge_current) {
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value = pdata->charge_current & BQ24735_CHARGE_CURRENT_MASK;
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ret = bq24735_write_word(charger->client,
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BQ24735_CHARGE_CURRENT, value);
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if (ret < 0) {
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dev_err(&charger->client->dev,
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"Failed to write charger current : %d\n",
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ret);
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return ret;
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}
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}
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if (pdata->charge_voltage) {
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value = pdata->charge_voltage & BQ24735_CHARGE_VOLTAGE_MASK;
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ret = bq24735_write_word(charger->client,
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BQ24735_CHARGE_VOLTAGE, value);
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if (ret < 0) {
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dev_err(&charger->client->dev,
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"Failed to write charger voltage : %d\n",
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ret);
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return ret;
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}
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}
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if (pdata->input_current) {
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value = pdata->input_current & BQ24735_INPUT_CURRENT_MASK;
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ret = bq24735_write_word(charger->client,
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BQ24735_INPUT_CURRENT, value);
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if (ret < 0) {
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dev_err(&charger->client->dev,
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"Failed to write input current : %d\n",
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ret);
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return ret;
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}
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}
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return 0;
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}
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static bool bq24735_charger_is_present(struct bq24735 *charger)
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{
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struct bq24735_platform *pdata = charger->pdata;
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int ret;
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if (pdata->status_gpio_valid) {
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ret = gpio_get_value_cansleep(pdata->status_gpio);
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return ret ^= pdata->status_gpio_active_low == 0;
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} else {
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int ac = 0;
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ac = bq24735_read_word(charger->client, BQ24735_CHG_OPT);
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if (ac < 0) {
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dev_err(&charger->client->dev,
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"Failed to read charger options : %d\n",
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ac);
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return false;
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}
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return (ac & BQ24735_CHG_OPT_AC_PRESENT) ? true : false;
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}
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return false;
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}
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static int bq24735_charger_is_charging(struct bq24735 *charger)
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{
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int ret = bq24735_read_word(charger->client, BQ24735_CHG_OPT);
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if (ret < 0)
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return ret;
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return !(ret & BQ24735_CHG_OPT_CHARGE_DISABLE);
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}
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static irqreturn_t bq24735_charger_isr(int irq, void *devid)
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{
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struct power_supply *psy = devid;
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struct bq24735 *charger = to_bq24735(psy);
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mutex_lock(&charger->lock);
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if (charger->charging && bq24735_charger_is_present(charger))
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bq24735_enable_charging(charger);
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else
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bq24735_disable_charging(charger);
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mutex_unlock(&charger->lock);
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power_supply_changed(psy);
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return IRQ_HANDLED;
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}
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static int bq24735_charger_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 bq24735 *charger = to_bq24735(psy);
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switch (psp) {
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case POWER_SUPPLY_PROP_ONLINE:
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val->intval = bq24735_charger_is_present(charger) ? 1 : 0;
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break;
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case POWER_SUPPLY_PROP_STATUS:
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switch (bq24735_charger_is_charging(charger)) {
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case 1:
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val->intval = POWER_SUPPLY_STATUS_CHARGING;
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break;
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case 0:
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val->intval = POWER_SUPPLY_STATUS_NOT_CHARGING;
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break;
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default:
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val->intval = POWER_SUPPLY_STATUS_UNKNOWN;
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break;
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}
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break;
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default:
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return -EINVAL;
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}
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return 0;
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}
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static int bq24735_charger_set_property(struct power_supply *psy,
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enum power_supply_property psp,
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const union power_supply_propval *val)
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{
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struct bq24735 *charger = to_bq24735(psy);
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int ret;
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switch (psp) {
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case POWER_SUPPLY_PROP_STATUS:
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switch (val->intval) {
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case POWER_SUPPLY_STATUS_CHARGING:
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mutex_lock(&charger->lock);
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charger->charging = true;
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ret = bq24735_enable_charging(charger);
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mutex_unlock(&charger->lock);
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if (ret)
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return ret;
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bq24735_config_charger(charger);
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break;
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case POWER_SUPPLY_STATUS_DISCHARGING:
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case POWER_SUPPLY_STATUS_NOT_CHARGING:
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mutex_lock(&charger->lock);
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charger->charging = false;
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ret = bq24735_disable_charging(charger);
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mutex_unlock(&charger->lock);
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if (ret)
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return ret;
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break;
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default:
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return -EINVAL;
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}
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power_supply_changed(psy);
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break;
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default:
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return -EPERM;
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}
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return 0;
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}
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static struct bq24735_platform *bq24735_parse_dt_data(struct i2c_client *client)
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{
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struct bq24735_platform *pdata;
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struct device_node *np = client->dev.of_node;
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u32 val;
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int ret;
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enum of_gpio_flags flags;
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pdata = devm_kzalloc(&client->dev, sizeof(*pdata), GFP_KERNEL);
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if (!pdata) {
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dev_err(&client->dev,
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"Memory alloc for bq24735 pdata failed\n");
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return NULL;
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}
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pdata->status_gpio = of_get_named_gpio_flags(np, "ti,ac-detect-gpios",
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0, &flags);
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if (flags & OF_GPIO_ACTIVE_LOW)
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pdata->status_gpio_active_low = 1;
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ret = of_property_read_u32(np, "ti,charge-current", &val);
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if (!ret)
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pdata->charge_current = val;
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ret = of_property_read_u32(np, "ti,charge-voltage", &val);
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if (!ret)
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pdata->charge_voltage = val;
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ret = of_property_read_u32(np, "ti,input-current", &val);
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if (!ret)
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pdata->input_current = val;
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pdata->ext_control = of_property_read_bool(np, "ti,external-control");
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return pdata;
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}
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static int bq24735_charger_probe(struct i2c_client *client,
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const struct i2c_device_id *id)
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{
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int ret;
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struct bq24735 *charger;
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struct power_supply_desc *supply_desc;
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struct power_supply_config psy_cfg = {};
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char *name;
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charger = devm_kzalloc(&client->dev, sizeof(*charger), GFP_KERNEL);
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if (!charger)
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return -ENOMEM;
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mutex_init(&charger->lock);
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charger->charging = true;
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charger->pdata = client->dev.platform_data;
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if (IS_ENABLED(CONFIG_OF) && !charger->pdata && client->dev.of_node)
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charger->pdata = bq24735_parse_dt_data(client);
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if (!charger->pdata) {
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dev_err(&client->dev, "no platform data provided\n");
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return -EINVAL;
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}
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name = (char *)charger->pdata->name;
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if (!name) {
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name = devm_kasprintf(&client->dev, GFP_KERNEL,
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"bq24735@%s",
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dev_name(&client->dev));
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if (!name) {
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dev_err(&client->dev, "Failed to alloc device name\n");
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return -ENOMEM;
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}
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}
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charger->client = client;
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supply_desc = &charger->charger_desc;
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supply_desc->name = name;
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supply_desc->type = POWER_SUPPLY_TYPE_MAINS;
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supply_desc->properties = bq24735_charger_properties;
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supply_desc->num_properties = ARRAY_SIZE(bq24735_charger_properties);
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supply_desc->get_property = bq24735_charger_get_property;
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supply_desc->set_property = bq24735_charger_set_property;
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supply_desc->property_is_writeable =
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bq24735_charger_property_is_writeable;
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psy_cfg.supplied_to = charger->pdata->supplied_to;
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psy_cfg.num_supplicants = charger->pdata->num_supplicants;
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psy_cfg.of_node = client->dev.of_node;
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psy_cfg.drv_data = charger;
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i2c_set_clientdata(client, charger);
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if (gpio_is_valid(charger->pdata->status_gpio)) {
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ret = devm_gpio_request(&client->dev,
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charger->pdata->status_gpio,
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name);
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if (ret) {
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dev_err(&client->dev,
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"Failed GPIO request for GPIO %d: %d\n",
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charger->pdata->status_gpio, ret);
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}
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charger->pdata->status_gpio_valid = !ret;
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}
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if (!charger->pdata->status_gpio_valid
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|| bq24735_charger_is_present(charger)) {
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ret = bq24735_read_word(client, BQ24735_MANUFACTURER_ID);
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if (ret < 0) {
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dev_err(&client->dev, "Failed to read manufacturer id : %d\n",
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ret);
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return ret;
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} else if (ret != 0x0040) {
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dev_err(&client->dev,
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"manufacturer id mismatch. 0x0040 != 0x%04x\n", ret);
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return -ENODEV;
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}
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ret = bq24735_read_word(client, BQ24735_DEVICE_ID);
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if (ret < 0) {
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dev_err(&client->dev, "Failed to read device id : %d\n", ret);
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return ret;
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} else if (ret != 0x000B) {
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dev_err(&client->dev,
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"device id mismatch. 0x000b != 0x%04x\n", ret);
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return -ENODEV;
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}
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}
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ret = bq24735_config_charger(charger);
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if (ret < 0) {
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dev_err(&client->dev, "failed in configuring charger");
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return ret;
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}
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/* check for AC adapter presence */
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if (bq24735_charger_is_present(charger)) {
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ret = bq24735_enable_charging(charger);
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if (ret < 0) {
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dev_err(&client->dev, "Failed to enable charging\n");
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return ret;
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}
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}
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charger->charger = devm_power_supply_register(&client->dev, supply_desc,
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&psy_cfg);
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if (IS_ERR(charger->charger)) {
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ret = PTR_ERR(charger->charger);
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dev_err(&client->dev, "Failed to register power supply: %d\n",
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ret);
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return ret;
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}
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if (client->irq) {
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ret = devm_request_threaded_irq(&client->dev, client->irq,
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NULL, bq24735_charger_isr,
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IRQF_TRIGGER_RISING |
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IRQF_TRIGGER_FALLING |
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IRQF_ONESHOT,
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supply_desc->name,
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charger->charger);
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if (ret) {
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dev_err(&client->dev,
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"Unable to register IRQ %d err %d\n",
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client->irq, ret);
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return ret;
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}
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}
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return 0;
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}
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static const struct i2c_device_id bq24735_charger_id[] = {
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{ "bq24735-charger", 0 },
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{}
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};
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MODULE_DEVICE_TABLE(i2c, bq24735_charger_id);
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static const struct of_device_id bq24735_match_ids[] = {
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{ .compatible = "ti,bq24735", },
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{ /* end */ }
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};
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MODULE_DEVICE_TABLE(of, bq24735_match_ids);
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static struct i2c_driver bq24735_charger_driver = {
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.driver = {
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.name = "bq24735-charger",
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.of_match_table = bq24735_match_ids,
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},
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.probe = bq24735_charger_probe,
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.id_table = bq24735_charger_id,
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};
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module_i2c_driver(bq24735_charger_driver);
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MODULE_DESCRIPTION("bq24735 battery charging driver");
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MODULE_AUTHOR("Darbha Sriharsha <dsriharsha@nvidia.com>");
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MODULE_LICENSE("GPL v2");
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