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369 lines
10 KiB
369 lines
10 KiB
// SPDX-License-Identifier: GPL-2.0+ |
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// |
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// max8997-irq.c - Interrupt controller support for MAX8997 |
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// |
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// Copyright (C) 2011 Samsung Electronics Co.Ltd |
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// MyungJoo Ham <[email protected]> |
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// |
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// This driver is based on max8998-irq.c |
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#include <linux/err.h> |
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#include <linux/irq.h> |
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#include <linux/interrupt.h> |
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#include <linux/mfd/max8997.h> |
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#include <linux/mfd/max8997-private.h> |
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static const u8 max8997_mask_reg[] = { |
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[PMIC_INT1] = MAX8997_REG_INT1MSK, |
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[PMIC_INT2] = MAX8997_REG_INT2MSK, |
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[PMIC_INT3] = MAX8997_REG_INT3MSK, |
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[PMIC_INT4] = MAX8997_REG_INT4MSK, |
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[FUEL_GAUGE] = MAX8997_REG_INVALID, |
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[MUIC_INT1] = MAX8997_MUIC_REG_INTMASK1, |
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[MUIC_INT2] = MAX8997_MUIC_REG_INTMASK2, |
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[MUIC_INT3] = MAX8997_MUIC_REG_INTMASK3, |
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[GPIO_LOW] = MAX8997_REG_INVALID, |
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[GPIO_HI] = MAX8997_REG_INVALID, |
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[FLASH_STATUS] = MAX8997_REG_INVALID, |
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}; |
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static struct i2c_client *get_i2c(struct max8997_dev *max8997, |
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enum max8997_irq_source src) |
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{ |
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switch (src) { |
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case PMIC_INT1 ... PMIC_INT4: |
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return max8997->i2c; |
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case FUEL_GAUGE: |
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return NULL; |
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case MUIC_INT1 ... MUIC_INT3: |
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return max8997->muic; |
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case GPIO_LOW ... GPIO_HI: |
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return max8997->i2c; |
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case FLASH_STATUS: |
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return max8997->i2c; |
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default: |
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return ERR_PTR(-EINVAL); |
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} |
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} |
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struct max8997_irq_data { |
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int mask; |
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enum max8997_irq_source group; |
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}; |
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#define DECLARE_IRQ(idx, _group, _mask) \ |
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[(idx)] = { .group = (_group), .mask = (_mask) } |
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static const struct max8997_irq_data max8997_irqs[] = { |
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DECLARE_IRQ(MAX8997_PMICIRQ_PWRONR, PMIC_INT1, 1 << 0), |
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DECLARE_IRQ(MAX8997_PMICIRQ_PWRONF, PMIC_INT1, 1 << 1), |
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DECLARE_IRQ(MAX8997_PMICIRQ_PWRON1SEC, PMIC_INT1, 1 << 3), |
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DECLARE_IRQ(MAX8997_PMICIRQ_JIGONR, PMIC_INT1, 1 << 4), |
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DECLARE_IRQ(MAX8997_PMICIRQ_JIGONF, PMIC_INT1, 1 << 5), |
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DECLARE_IRQ(MAX8997_PMICIRQ_LOWBAT2, PMIC_INT1, 1 << 6), |
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DECLARE_IRQ(MAX8997_PMICIRQ_LOWBAT1, PMIC_INT1, 1 << 7), |
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DECLARE_IRQ(MAX8997_PMICIRQ_JIGR, PMIC_INT2, 1 << 0), |
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DECLARE_IRQ(MAX8997_PMICIRQ_JIGF, PMIC_INT2, 1 << 1), |
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DECLARE_IRQ(MAX8997_PMICIRQ_MR, PMIC_INT2, 1 << 2), |
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DECLARE_IRQ(MAX8997_PMICIRQ_DVS1OK, PMIC_INT2, 1 << 3), |
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DECLARE_IRQ(MAX8997_PMICIRQ_DVS2OK, PMIC_INT2, 1 << 4), |
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DECLARE_IRQ(MAX8997_PMICIRQ_DVS3OK, PMIC_INT2, 1 << 5), |
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DECLARE_IRQ(MAX8997_PMICIRQ_DVS4OK, PMIC_INT2, 1 << 6), |
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DECLARE_IRQ(MAX8997_PMICIRQ_CHGINS, PMIC_INT3, 1 << 0), |
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DECLARE_IRQ(MAX8997_PMICIRQ_CHGRM, PMIC_INT3, 1 << 1), |
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DECLARE_IRQ(MAX8997_PMICIRQ_DCINOVP, PMIC_INT3, 1 << 2), |
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DECLARE_IRQ(MAX8997_PMICIRQ_TOPOFFR, PMIC_INT3, 1 << 3), |
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DECLARE_IRQ(MAX8997_PMICIRQ_CHGRSTF, PMIC_INT3, 1 << 5), |
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DECLARE_IRQ(MAX8997_PMICIRQ_MBCHGTMEXPD, PMIC_INT3, 1 << 7), |
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DECLARE_IRQ(MAX8997_PMICIRQ_RTC60S, PMIC_INT4, 1 << 0), |
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DECLARE_IRQ(MAX8997_PMICIRQ_RTCA1, PMIC_INT4, 1 << 1), |
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DECLARE_IRQ(MAX8997_PMICIRQ_RTCA2, PMIC_INT4, 1 << 2), |
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DECLARE_IRQ(MAX8997_PMICIRQ_SMPL_INT, PMIC_INT4, 1 << 3), |
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DECLARE_IRQ(MAX8997_PMICIRQ_RTC1S, PMIC_INT4, 1 << 4), |
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DECLARE_IRQ(MAX8997_PMICIRQ_WTSR, PMIC_INT4, 1 << 5), |
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DECLARE_IRQ(MAX8997_MUICIRQ_ADCError, MUIC_INT1, 1 << 2), |
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DECLARE_IRQ(MAX8997_MUICIRQ_ADCLow, MUIC_INT1, 1 << 1), |
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DECLARE_IRQ(MAX8997_MUICIRQ_ADC, MUIC_INT1, 1 << 0), |
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DECLARE_IRQ(MAX8997_MUICIRQ_VBVolt, MUIC_INT2, 1 << 4), |
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DECLARE_IRQ(MAX8997_MUICIRQ_DBChg, MUIC_INT2, 1 << 3), |
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DECLARE_IRQ(MAX8997_MUICIRQ_DCDTmr, MUIC_INT2, 1 << 2), |
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DECLARE_IRQ(MAX8997_MUICIRQ_ChgDetRun, MUIC_INT2, 1 << 1), |
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DECLARE_IRQ(MAX8997_MUICIRQ_ChgTyp, MUIC_INT2, 1 << 0), |
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DECLARE_IRQ(MAX8997_MUICIRQ_OVP, MUIC_INT3, 1 << 2), |
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}; |
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static void max8997_irq_lock(struct irq_data *data) |
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{ |
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struct max8997_dev *max8997 = irq_data_get_irq_chip_data(data); |
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mutex_lock(&max8997->irqlock); |
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} |
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static void max8997_irq_sync_unlock(struct irq_data *data) |
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{ |
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struct max8997_dev *max8997 = irq_data_get_irq_chip_data(data); |
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int i; |
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for (i = 0; i < MAX8997_IRQ_GROUP_NR; i++) { |
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u8 mask_reg = max8997_mask_reg[i]; |
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struct i2c_client *i2c = get_i2c(max8997, i); |
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if (mask_reg == MAX8997_REG_INVALID || |
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IS_ERR_OR_NULL(i2c)) |
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continue; |
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max8997->irq_masks_cache[i] = max8997->irq_masks_cur[i]; |
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max8997_write_reg(i2c, max8997_mask_reg[i], |
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max8997->irq_masks_cur[i]); |
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} |
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mutex_unlock(&max8997->irqlock); |
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} |
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inline static const struct max8997_irq_data * |
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irq_to_max8997_irq(struct max8997_dev *max8997, struct irq_data *data) |
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{ |
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return &max8997_irqs[data->hwirq]; |
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} |
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static void max8997_irq_mask(struct irq_data *data) |
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{ |
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struct max8997_dev *max8997 = irq_data_get_irq_chip_data(data); |
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const struct max8997_irq_data *irq_data = irq_to_max8997_irq(max8997, |
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data); |
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max8997->irq_masks_cur[irq_data->group] |= irq_data->mask; |
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} |
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static void max8997_irq_unmask(struct irq_data *data) |
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{ |
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struct max8997_dev *max8997 = irq_data_get_irq_chip_data(data); |
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const struct max8997_irq_data *irq_data = irq_to_max8997_irq(max8997, |
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data); |
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max8997->irq_masks_cur[irq_data->group] &= ~irq_data->mask; |
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} |
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static struct irq_chip max8997_irq_chip = { |
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.name = "max8997", |
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.irq_bus_lock = max8997_irq_lock, |
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.irq_bus_sync_unlock = max8997_irq_sync_unlock, |
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.irq_mask = max8997_irq_mask, |
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.irq_unmask = max8997_irq_unmask, |
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}; |
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#define MAX8997_IRQSRC_PMIC (1 << 1) |
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#define MAX8997_IRQSRC_FUELGAUGE (1 << 2) |
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#define MAX8997_IRQSRC_MUIC (1 << 3) |
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#define MAX8997_IRQSRC_GPIO (1 << 4) |
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#define MAX8997_IRQSRC_FLASH (1 << 5) |
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static irqreturn_t max8997_irq_thread(int irq, void *data) |
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{ |
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struct max8997_dev *max8997 = data; |
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u8 irq_reg[MAX8997_IRQ_GROUP_NR] = {}; |
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u8 irq_src; |
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int ret; |
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int i, cur_irq; |
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ret = max8997_read_reg(max8997->i2c, MAX8997_REG_INTSRC, &irq_src); |
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if (ret < 0) { |
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dev_err(max8997->dev, "Failed to read interrupt source: %d\n", |
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ret); |
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return IRQ_NONE; |
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} |
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if (irq_src & MAX8997_IRQSRC_PMIC) { |
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/* PMIC INT1 ~ INT4 */ |
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max8997_bulk_read(max8997->i2c, MAX8997_REG_INT1, 4, |
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&irq_reg[PMIC_INT1]); |
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} |
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if (irq_src & MAX8997_IRQSRC_FUELGAUGE) { |
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/* |
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* TODO: FUEL GAUGE |
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* |
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* This is to be supported by Max17042 driver. When |
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* an interrupt incurs here, it should be relayed to a |
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* Max17042 device that is connected (probably by |
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* platform-data). However, we do not have interrupt |
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* handling in Max17042 driver currently. The Max17042 IRQ |
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* driver should be ready to be used as a stand-alone device and |
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* a Max8997-dependent device. Because it is not ready in |
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* Max17042-side and it is not too critical in operating |
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* Max8997, we do not implement this in initial releases. |
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*/ |
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irq_reg[FUEL_GAUGE] = 0; |
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} |
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if (irq_src & MAX8997_IRQSRC_MUIC) { |
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/* MUIC INT1 ~ INT3 */ |
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max8997_bulk_read(max8997->muic, MAX8997_MUIC_REG_INT1, 3, |
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&irq_reg[MUIC_INT1]); |
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} |
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if (irq_src & MAX8997_IRQSRC_GPIO) { |
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/* GPIO Interrupt */ |
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u8 gpio_info[MAX8997_NUM_GPIO]; |
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irq_reg[GPIO_LOW] = 0; |
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irq_reg[GPIO_HI] = 0; |
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max8997_bulk_read(max8997->i2c, MAX8997_REG_GPIOCNTL1, |
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MAX8997_NUM_GPIO, gpio_info); |
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for (i = 0; i < MAX8997_NUM_GPIO; i++) { |
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bool interrupt = false; |
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switch (gpio_info[i] & MAX8997_GPIO_INT_MASK) { |
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case MAX8997_GPIO_INT_BOTH: |
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if (max8997->gpio_status[i] != gpio_info[i]) |
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interrupt = true; |
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break; |
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case MAX8997_GPIO_INT_RISE: |
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if ((max8997->gpio_status[i] != gpio_info[i]) && |
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(gpio_info[i] & MAX8997_GPIO_DATA_MASK)) |
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interrupt = true; |
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break; |
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case MAX8997_GPIO_INT_FALL: |
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if ((max8997->gpio_status[i] != gpio_info[i]) && |
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!(gpio_info[i] & MAX8997_GPIO_DATA_MASK)) |
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interrupt = true; |
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break; |
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default: |
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break; |
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} |
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if (interrupt) { |
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if (i < 8) |
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irq_reg[GPIO_LOW] |= (1 << i); |
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else |
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irq_reg[GPIO_HI] |= (1 << (i - 8)); |
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} |
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} |
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} |
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if (irq_src & MAX8997_IRQSRC_FLASH) { |
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/* Flash Status Interrupt */ |
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ret = max8997_read_reg(max8997->i2c, MAX8997_REG_FLASHSTATUS, |
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&irq_reg[FLASH_STATUS]); |
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} |
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/* Apply masking */ |
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for (i = 0; i < MAX8997_IRQ_GROUP_NR; i++) |
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irq_reg[i] &= ~max8997->irq_masks_cur[i]; |
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/* Report */ |
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for (i = 0; i < MAX8997_IRQ_NR; i++) { |
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if (irq_reg[max8997_irqs[i].group] & max8997_irqs[i].mask) { |
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cur_irq = irq_find_mapping(max8997->irq_domain, i); |
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if (cur_irq) |
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handle_nested_irq(cur_irq); |
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} |
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} |
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return IRQ_HANDLED; |
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} |
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int max8997_irq_resume(struct max8997_dev *max8997) |
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{ |
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if (max8997->irq && max8997->irq_domain) |
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max8997_irq_thread(0, max8997); |
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return 0; |
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} |
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static int max8997_irq_domain_map(struct irq_domain *d, unsigned int irq, |
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irq_hw_number_t hw) |
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{ |
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struct max8997_dev *max8997 = d->host_data; |
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irq_set_chip_data(irq, max8997); |
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irq_set_chip_and_handler(irq, &max8997_irq_chip, handle_edge_irq); |
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irq_set_nested_thread(irq, 1); |
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irq_set_noprobe(irq); |
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return 0; |
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} |
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static const struct irq_domain_ops max8997_irq_domain_ops = { |
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.map = max8997_irq_domain_map, |
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}; |
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int max8997_irq_init(struct max8997_dev *max8997) |
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{ |
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struct irq_domain *domain; |
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int i; |
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int ret; |
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u8 val; |
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if (!max8997->irq) { |
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dev_warn(max8997->dev, "No interrupt specified.\n"); |
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return 0; |
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} |
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mutex_init(&max8997->irqlock); |
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/* Mask individual interrupt sources */ |
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for (i = 0; i < MAX8997_IRQ_GROUP_NR; i++) { |
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struct i2c_client *i2c; |
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max8997->irq_masks_cur[i] = 0xff; |
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max8997->irq_masks_cache[i] = 0xff; |
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i2c = get_i2c(max8997, i); |
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if (IS_ERR_OR_NULL(i2c)) |
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continue; |
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if (max8997_mask_reg[i] == MAX8997_REG_INVALID) |
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continue; |
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max8997_write_reg(i2c, max8997_mask_reg[i], 0xff); |
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} |
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for (i = 0; i < MAX8997_NUM_GPIO; i++) { |
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max8997->gpio_status[i] = (max8997_read_reg(max8997->i2c, |
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MAX8997_REG_GPIOCNTL1 + i, |
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&val) |
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& MAX8997_GPIO_DATA_MASK) ? |
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true : false; |
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} |
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domain = irq_domain_add_linear(NULL, MAX8997_IRQ_NR, |
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&max8997_irq_domain_ops, max8997); |
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if (!domain) { |
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dev_err(max8997->dev, "could not create irq domain\n"); |
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return -ENODEV; |
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} |
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max8997->irq_domain = domain; |
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ret = request_threaded_irq(max8997->irq, NULL, max8997_irq_thread, |
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IRQF_TRIGGER_FALLING | IRQF_ONESHOT, |
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"max8997-irq", max8997); |
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if (ret) { |
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dev_err(max8997->dev, "Failed to request IRQ %d: %d\n", |
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max8997->irq, ret); |
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return ret; |
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} |
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if (!max8997->ono) |
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return 0; |
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ret = request_threaded_irq(max8997->ono, NULL, max8997_irq_thread, |
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IRQF_TRIGGER_FALLING | IRQF_TRIGGER_RISING | |
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IRQF_ONESHOT, "max8997-ono", max8997); |
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if (ret) |
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dev_err(max8997->dev, "Failed to request ono-IRQ %d: %d\n", |
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max8997->ono, ret); |
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return 0; |
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} |
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void max8997_irq_exit(struct max8997_dev *max8997) |
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{ |
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if (max8997->ono) |
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free_irq(max8997->ono, max8997); |
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if (max8997->irq) |
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free_irq(max8997->irq, max8997); |
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}
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