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517 lines
12 KiB
517 lines
12 KiB
/* |
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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/devm-helpers.h> |
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#include <linux/err.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/gpio/consumer.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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|
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/* BQ24735 available commands and their respective masks */ |
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#define BQ24735_CHARGE_OPT 0x12 |
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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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|
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/* ChargeOptions bits of interest */ |
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#define BQ24735_CHARGE_OPT_CHG_DISABLE (1 << 0) |
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#define BQ24735_CHARGE_OPT_AC_PRESENT (1 << 4) |
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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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struct gpio_desc *status_gpio; |
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struct delayed_work poll; |
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u32 poll_interval; |
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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, 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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return i2c_smbus_read_word_data(client, reg); |
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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 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 inline int bq24735_enable_charging(struct bq24735 *charger) |
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{ |
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int ret; |
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if (charger->pdata->ext_control) |
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return 0; |
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ret = bq24735_config_charger(charger); |
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if (ret) |
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return ret; |
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return bq24735_update_word(charger->client, BQ24735_CHARGE_OPT, |
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BQ24735_CHARGE_OPT_CHG_DISABLE, 0); |
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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_CHARGE_OPT, |
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BQ24735_CHARGE_OPT_CHG_DISABLE, |
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BQ24735_CHARGE_OPT_CHG_DISABLE); |
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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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if (charger->status_gpio) { |
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return !gpiod_get_value_cansleep(charger->status_gpio); |
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} else { |
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int ac = 0; |
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ac = bq24735_read_word(charger->client, BQ24735_CHARGE_OPT); |
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if (ac < 0) { |
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dev_dbg(&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_CHARGE_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; |
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if (!bq24735_charger_is_present(charger)) |
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return 0; |
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ret = bq24735_read_word(charger->client, BQ24735_CHARGE_OPT); |
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if (ret < 0) |
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return ret; |
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return !(ret & BQ24735_CHARGE_OPT_CHG_DISABLE); |
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} |
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static void bq24735_update(struct bq24735 *charger) |
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{ |
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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(charger->charger); |
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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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bq24735_update(charger); |
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return IRQ_HANDLED; |
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} |
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static void bq24735_poll(struct work_struct *work) |
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{ |
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struct bq24735 *charger = container_of(work, struct bq24735, poll.work); |
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bq24735_update(charger); |
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schedule_delayed_work(&charger->poll, |
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msecs_to_jiffies(charger->poll_interval)); |
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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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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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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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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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charger->status_gpio = devm_gpiod_get_optional(&client->dev, |
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"ti,ac-detect", |
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GPIOD_IN); |
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if (IS_ERR(charger->status_gpio)) { |
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ret = PTR_ERR(charger->status_gpio); |
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dev_err(&client->dev, "Getting gpio failed: %d\n", ret); |
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return ret; |
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} |
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if (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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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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} else { |
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ret = device_property_read_u32(&client->dev, "poll-interval", |
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&charger->poll_interval); |
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if (ret) |
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return 0; |
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if (!charger->poll_interval) |
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return 0; |
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ret = devm_delayed_work_autocancel(&client->dev, &charger->poll, |
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bq24735_poll); |
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if (ret) |
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return ret; |
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schedule_delayed_work(&charger->poll, |
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msecs_to_jiffies(charger->poll_interval)); |
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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 <[email protected]>"); |
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MODULE_LICENSE("GPL v2");
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