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286 lines
7.1 KiB
286 lines
7.1 KiB
// SPDX-License-Identifier: GPL-2.0 |
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// Battery charger driver for TI's tps65217 |
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// |
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// Copyright (C) 2015 Collabora Ltd. |
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// Author: Enric Balletbo i Serra <[email protected]> |
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/* |
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* Battery charger driver for TI's tps65217 |
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*/ |
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#include <linux/kernel.h> |
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#include <linux/kthread.h> |
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#include <linux/device.h> |
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#include <linux/module.h> |
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#include <linux/platform_device.h> |
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#include <linux/init.h> |
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#include <linux/interrupt.h> |
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#include <linux/slab.h> |
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#include <linux/err.h> |
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#include <linux/of.h> |
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#include <linux/of_device.h> |
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#include <linux/power_supply.h> |
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#include <linux/mfd/core.h> |
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#include <linux/mfd/tps65217.h> |
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#define CHARGER_STATUS_PRESENT (TPS65217_STATUS_ACPWR | TPS65217_STATUS_USBPWR) |
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#define NUM_CHARGER_IRQS 2 |
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#define POLL_INTERVAL (HZ * 2) |
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struct tps65217_charger { |
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struct tps65217 *tps; |
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struct device *dev; |
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struct power_supply *psy; |
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int online; |
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int prev_online; |
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struct task_struct *poll_task; |
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}; |
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static enum power_supply_property tps65217_charger_props[] = { |
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POWER_SUPPLY_PROP_ONLINE, |
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}; |
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static int tps65217_config_charger(struct tps65217_charger *charger) |
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{ |
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int ret; |
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/* |
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* tps65217 rev. G, p. 31 (see p. 32 for NTC schematic) |
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* |
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* The device can be configured to support a 100k NTC (B = 3960) by |
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* setting the the NTC_TYPE bit in register CHGCONFIG1 to 1. However it |
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* is not recommended to do so. In sleep mode, the charger continues |
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* charging the battery, but all register values are reset to default |
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* values. Therefore, the charger would get the wrong temperature |
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* information. If 100k NTC setting is required, please contact the |
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* factory. |
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* |
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* ATTENTION, conflicting information, from p. 46 |
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* |
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* NTC TYPE (for battery temperature measurement) |
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* 0 – 100k (curve 1, B = 3960) |
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* 1 – 10k (curve 2, B = 3480) (default on reset) |
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* |
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*/ |
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ret = tps65217_clear_bits(charger->tps, TPS65217_REG_CHGCONFIG1, |
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TPS65217_CHGCONFIG1_NTC_TYPE, |
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TPS65217_PROTECT_NONE); |
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if (ret) { |
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dev_err(charger->dev, |
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"failed to set 100k NTC setting: %d\n", ret); |
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return ret; |
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} |
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return 0; |
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} |
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static int tps65217_enable_charging(struct tps65217_charger *charger) |
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{ |
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int ret; |
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/* charger already enabled */ |
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if (charger->online) |
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return 0; |
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dev_dbg(charger->dev, "%s: enable charging\n", __func__); |
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ret = tps65217_set_bits(charger->tps, TPS65217_REG_CHGCONFIG1, |
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TPS65217_CHGCONFIG1_CHG_EN, |
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TPS65217_CHGCONFIG1_CHG_EN, |
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TPS65217_PROTECT_NONE); |
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if (ret) { |
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dev_err(charger->dev, |
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"%s: Error in writing CHG_EN in reg 0x%x: %d\n", |
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__func__, TPS65217_REG_CHGCONFIG1, ret); |
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return ret; |
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} |
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charger->online = 1; |
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return 0; |
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} |
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static int tps65217_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 tps65217_charger *charger = power_supply_get_drvdata(psy); |
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if (psp == POWER_SUPPLY_PROP_ONLINE) { |
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val->intval = charger->online; |
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return 0; |
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} |
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return -EINVAL; |
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} |
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static irqreturn_t tps65217_charger_irq(int irq, void *dev) |
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{ |
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int ret, val; |
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struct tps65217_charger *charger = dev; |
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charger->prev_online = charger->online; |
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ret = tps65217_reg_read(charger->tps, TPS65217_REG_STATUS, &val); |
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if (ret < 0) { |
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dev_err(charger->dev, "%s: Error in reading reg 0x%x\n", |
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__func__, TPS65217_REG_STATUS); |
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return IRQ_HANDLED; |
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} |
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dev_dbg(charger->dev, "%s: 0x%x\n", __func__, val); |
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/* check for charger status bit */ |
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if (val & CHARGER_STATUS_PRESENT) { |
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ret = tps65217_enable_charging(charger); |
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if (ret) { |
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dev_err(charger->dev, |
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"failed to enable charger: %d\n", ret); |
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return IRQ_HANDLED; |
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} |
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} else { |
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charger->online = 0; |
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} |
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if (charger->prev_online != charger->online) |
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power_supply_changed(charger->psy); |
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ret = tps65217_reg_read(charger->tps, TPS65217_REG_CHGCONFIG0, &val); |
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if (ret < 0) { |
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dev_err(charger->dev, "%s: Error in reading reg 0x%x\n", |
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__func__, TPS65217_REG_CHGCONFIG0); |
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return IRQ_HANDLED; |
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} |
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if (val & TPS65217_CHGCONFIG0_ACTIVE) |
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dev_dbg(charger->dev, "%s: charger is charging\n", __func__); |
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else |
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dev_dbg(charger->dev, |
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"%s: charger is NOT charging\n", __func__); |
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return IRQ_HANDLED; |
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} |
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static int tps65217_charger_poll_task(void *data) |
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{ |
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set_freezable(); |
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while (!kthread_should_stop()) { |
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schedule_timeout_interruptible(POLL_INTERVAL); |
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try_to_freeze(); |
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tps65217_charger_irq(-1, data); |
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} |
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return 0; |
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} |
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static const struct power_supply_desc tps65217_charger_desc = { |
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.name = "tps65217-charger", |
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.type = POWER_SUPPLY_TYPE_MAINS, |
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.get_property = tps65217_charger_get_property, |
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.properties = tps65217_charger_props, |
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.num_properties = ARRAY_SIZE(tps65217_charger_props), |
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}; |
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static int tps65217_charger_probe(struct platform_device *pdev) |
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{ |
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struct tps65217 *tps = dev_get_drvdata(pdev->dev.parent); |
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struct tps65217_charger *charger; |
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struct power_supply_config cfg = {}; |
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struct task_struct *poll_task; |
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int irq[NUM_CHARGER_IRQS]; |
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int ret; |
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int i; |
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charger = devm_kzalloc(&pdev->dev, sizeof(*charger), GFP_KERNEL); |
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if (!charger) |
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return -ENOMEM; |
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platform_set_drvdata(pdev, charger); |
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charger->tps = tps; |
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charger->dev = &pdev->dev; |
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cfg.of_node = pdev->dev.of_node; |
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cfg.drv_data = charger; |
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charger->psy = devm_power_supply_register(&pdev->dev, |
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&tps65217_charger_desc, |
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&cfg); |
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if (IS_ERR(charger->psy)) { |
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dev_err(&pdev->dev, "failed: power supply register\n"); |
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return PTR_ERR(charger->psy); |
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} |
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irq[0] = platform_get_irq_byname(pdev, "USB"); |
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irq[1] = platform_get_irq_byname(pdev, "AC"); |
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ret = tps65217_config_charger(charger); |
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if (ret < 0) { |
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dev_err(charger->dev, "charger config failed, err %d\n", ret); |
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return ret; |
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} |
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/* Create a polling thread if an interrupt is invalid */ |
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if (irq[0] < 0 || irq[1] < 0) { |
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poll_task = kthread_run(tps65217_charger_poll_task, |
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charger, "ktps65217charger"); |
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if (IS_ERR(poll_task)) { |
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ret = PTR_ERR(poll_task); |
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dev_err(charger->dev, |
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"Unable to run kthread err %d\n", ret); |
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return ret; |
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} |
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charger->poll_task = poll_task; |
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return 0; |
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} |
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/* Create IRQ threads for charger interrupts */ |
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for (i = 0; i < NUM_CHARGER_IRQS; i++) { |
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ret = devm_request_threaded_irq(&pdev->dev, irq[i], NULL, |
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tps65217_charger_irq, |
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IRQF_ONESHOT, "tps65217-charger", |
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charger); |
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if (ret) { |
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dev_err(charger->dev, |
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"Unable to register irq %d err %d\n", irq[i], |
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ret); |
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return ret; |
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} |
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/* Check current state */ |
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tps65217_charger_irq(-1, charger); |
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} |
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return 0; |
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} |
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static int tps65217_charger_remove(struct platform_device *pdev) |
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{ |
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struct tps65217_charger *charger = platform_get_drvdata(pdev); |
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if (charger->poll_task) |
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kthread_stop(charger->poll_task); |
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return 0; |
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} |
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static const struct of_device_id tps65217_charger_match_table[] = { |
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{ .compatible = "ti,tps65217-charger", }, |
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{ /* sentinel */ } |
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}; |
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MODULE_DEVICE_TABLE(of, tps65217_charger_match_table); |
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static struct platform_driver tps65217_charger_driver = { |
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.probe = tps65217_charger_probe, |
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.remove = tps65217_charger_remove, |
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.driver = { |
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.name = "tps65217-charger", |
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.of_match_table = of_match_ptr(tps65217_charger_match_table), |
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}, |
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}; |
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module_platform_driver(tps65217_charger_driver); |
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MODULE_LICENSE("GPL v2"); |
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MODULE_AUTHOR("Enric Balletbo Serra <[email protected]>"); |
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MODULE_DESCRIPTION("TPS65217 battery charger driver");
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