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360 lines
8.6 KiB
360 lines
8.6 KiB
// SPDX-License-Identifier: GPL-2.0-only |
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/* |
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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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*/ |
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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 = power_supply_get_drvdata(psy); |
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if (psp == POWER_SUPPLY_PROP_ONLINE) { |
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val->intval = charger->ac_online; |
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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 const struct power_supply_desc tps65090_charger_desc = { |
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.name = "tps65090-ac", |
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.type = POWER_SUPPLY_TYPE_MAINS, |
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.get_property = tps65090_ac_get_property, |
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.properties = tps65090_ac_props, |
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.num_properties = ARRAY_SIZE(tps65090_ac_props), |
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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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struct power_supply_config psy_cfg = {}; |
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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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psy_cfg.supplied_to = pdata->supplied_to; |
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psy_cfg.num_supplicants = pdata->num_supplicants; |
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psy_cfg.of_node = pdev->dev.of_node; |
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psy_cfg.drv_data = cdata; |
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cdata->ac = power_supply_register(&pdev->dev, &tps65090_charger_desc, |
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&psy_cfg); |
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if (IS_ERR(cdata->ac)) { |
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dev_err(&pdev->dev, "failed: power supply register\n"); |
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return PTR_ERR(cdata->ac); |
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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, IRQF_ONESHOT, "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 const 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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MODULE_DEVICE_TABLE(of, of_tps65090_charger_match); |
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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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}, |
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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 <[email protected]>"); |
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MODULE_DESCRIPTION("tps65090 battery charger driver");
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