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linux/drivers/mfd/max77693.c
Krzysztof Kozlowski f5f082eb04 mfd: max77693: Do not enforce (incorrect) interrupt trigger type 
Interrupt line can be configured on different hardware in different way,
even inverted.  Therefore driver should not enforce specific trigger
type - edge falling - but instead rely on Devicetree to configure it.

The Maxim 77693 datasheet describes the interrupt line as active low
with a requirement of acknowledge from the CPU therefore the edge
falling is not correct.

The interrupt line is shared between PMIC and RTC driver, so using level
sensitive interrupt is here especially important to avoid races.  With
an edge configuration in case if first PMIC signals interrupt followed
shortly after by the RTC, the interrupt might not be yet cleared/acked
thus the second one would not be noticed.

Signed-off-by: Krzysztof Kozlowski <krzk@kernel.org>
Acked-by: Rob Herring <robh@kernel.org>
Signed-off-by: Lee Jones <lee.jones@linaro.org>
Link: https://lore.kernel.org/r/20210602110445.33536-3-krzysztof.kozlowski@canonical.com
2021-11-05 14:40:06 +00:00

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// SPDX-License-Identifier: GPL-2.0+
//
// max77693.c - mfd core driver for the MAX 77693
//
// Copyright (C) 2012 Samsung Electronics
// SangYoung Son <hello.son@samsung.com>
//
// This program is not provided / owned by Maxim Integrated Products.
//
// This driver is based on max8997.c
#include <linux/module.h>
#include <linux/slab.h>
#include <linux/i2c.h>
#include <linux/err.h>
#include <linux/interrupt.h>
#include <linux/of.h>
#include <linux/pm_runtime.h>
#include <linux/mutex.h>
#include <linux/mfd/core.h>
#include <linux/mfd/max77693.h>
#include <linux/mfd/max77693-common.h>
#include <linux/mfd/max77693-private.h>
#include <linux/regulator/machine.h>
#include <linux/regmap.h>
#define I2C_ADDR_PMIC (0xCC >> 1) /* Charger, Flash LED */
#define I2C_ADDR_MUIC (0x4A >> 1)
#define I2C_ADDR_HAPTIC (0x90 >> 1)
static const struct mfd_cell max77693_devs[] = {
{ .name = "max77693-pmic", },
{
.name = "max77693-charger",
.of_compatible = "maxim,max77693-charger",
},
{
.name = "max77693-muic",
.of_compatible = "maxim,max77693-muic",
},
{
.name = "max77693-haptic",
.of_compatible = "maxim,max77693-haptic",
},
{
.name = "max77693-led",
.of_compatible = "maxim,max77693-led",
},
};
static const struct regmap_config max77693_regmap_config = {
.reg_bits = 8,
.val_bits = 8,
.max_register = MAX77693_PMIC_REG_END,
};
static const struct regmap_irq max77693_led_irqs[] = {
{ .mask = LED_IRQ_FLED2_OPEN, },
{ .mask = LED_IRQ_FLED2_SHORT, },
{ .mask = LED_IRQ_FLED1_OPEN, },
{ .mask = LED_IRQ_FLED1_SHORT, },
{ .mask = LED_IRQ_MAX_FLASH, },
};
static const struct regmap_irq_chip max77693_led_irq_chip = {
.name = "max77693-led",
.status_base = MAX77693_LED_REG_FLASH_INT,
.mask_base = MAX77693_LED_REG_FLASH_INT_MASK,
.mask_invert = false,
.num_regs = 1,
.irqs = max77693_led_irqs,
.num_irqs = ARRAY_SIZE(max77693_led_irqs),
};
static const struct regmap_irq max77693_topsys_irqs[] = {
{ .mask = TOPSYS_IRQ_T120C_INT, },
{ .mask = TOPSYS_IRQ_T140C_INT, },
{ .mask = TOPSYS_IRQ_LOWSYS_INT, },
};
static const struct regmap_irq_chip max77693_topsys_irq_chip = {
.name = "max77693-topsys",
.status_base = MAX77693_PMIC_REG_TOPSYS_INT,
.mask_base = MAX77693_PMIC_REG_TOPSYS_INT_MASK,
.mask_invert = false,
.num_regs = 1,
.irqs = max77693_topsys_irqs,
.num_irqs = ARRAY_SIZE(max77693_topsys_irqs),
};
static const struct regmap_irq max77693_charger_irqs[] = {
{ .mask = CHG_IRQ_BYP_I, },
{ .mask = CHG_IRQ_THM_I, },
{ .mask = CHG_IRQ_BAT_I, },
{ .mask = CHG_IRQ_CHG_I, },
{ .mask = CHG_IRQ_CHGIN_I, },
};
static const struct regmap_irq_chip max77693_charger_irq_chip = {
.name = "max77693-charger",
.status_base = MAX77693_CHG_REG_CHG_INT,
.mask_base = MAX77693_CHG_REG_CHG_INT_MASK,
.mask_invert = false,
.num_regs = 1,
.irqs = max77693_charger_irqs,
.num_irqs = ARRAY_SIZE(max77693_charger_irqs),
};
static const struct regmap_config max77693_regmap_muic_config = {
.reg_bits = 8,
.val_bits = 8,
.max_register = MAX77693_MUIC_REG_END,
};
static const struct regmap_irq max77693_muic_irqs[] = {
{ .reg_offset = 0, .mask = MUIC_IRQ_INT1_ADC, },
{ .reg_offset = 0, .mask = MUIC_IRQ_INT1_ADC_LOW, },
{ .reg_offset = 0, .mask = MUIC_IRQ_INT1_ADC_ERR, },
{ .reg_offset = 0, .mask = MUIC_IRQ_INT1_ADC1K, },
{ .reg_offset = 1, .mask = MUIC_IRQ_INT2_CHGTYP, },
{ .reg_offset = 1, .mask = MUIC_IRQ_INT2_CHGDETREUN, },
{ .reg_offset = 1, .mask = MUIC_IRQ_INT2_DCDTMR, },
{ .reg_offset = 1, .mask = MUIC_IRQ_INT2_DXOVP, },
{ .reg_offset = 1, .mask = MUIC_IRQ_INT2_VBVOLT, },
{ .reg_offset = 1, .mask = MUIC_IRQ_INT2_VIDRM, },
{ .reg_offset = 2, .mask = MUIC_IRQ_INT3_EOC, },
{ .reg_offset = 2, .mask = MUIC_IRQ_INT3_CGMBC, },
{ .reg_offset = 2, .mask = MUIC_IRQ_INT3_OVP, },
{ .reg_offset = 2, .mask = MUIC_IRQ_INT3_MBCCHG_ERR, },
{ .reg_offset = 2, .mask = MUIC_IRQ_INT3_CHG_ENABLED, },
{ .reg_offset = 2, .mask = MUIC_IRQ_INT3_BAT_DET, },
};
static const struct regmap_irq_chip max77693_muic_irq_chip = {
.name = "max77693-muic",
.status_base = MAX77693_MUIC_REG_INT1,
.mask_base = MAX77693_MUIC_REG_INTMASK1,
.mask_invert = true,
.num_regs = 3,
.irqs = max77693_muic_irqs,
.num_irqs = ARRAY_SIZE(max77693_muic_irqs),
};
static const struct regmap_config max77693_regmap_haptic_config = {
.reg_bits = 8,
.val_bits = 8,
.max_register = MAX77693_HAPTIC_REG_END,
};
static int max77693_i2c_probe(struct i2c_client *i2c,
const struct i2c_device_id *id)
{
struct max77693_dev *max77693;
unsigned int reg_data;
int ret = 0;
max77693 = devm_kzalloc(&i2c->dev,
sizeof(struct max77693_dev), GFP_KERNEL);
if (max77693 == NULL)
return -ENOMEM;
i2c_set_clientdata(i2c, max77693);
max77693->dev = &i2c->dev;
max77693->i2c = i2c;
max77693->irq = i2c->irq;
max77693->type = id->driver_data;
max77693->regmap = devm_regmap_init_i2c(i2c, &max77693_regmap_config);
if (IS_ERR(max77693->regmap)) {
ret = PTR_ERR(max77693->regmap);
dev_err(max77693->dev, "failed to allocate register map: %d\n",
ret);
return ret;
}
ret = regmap_read(max77693->regmap, MAX77693_PMIC_REG_PMIC_ID2,
&reg_data);
if (ret < 0) {
dev_err(max77693->dev, "device not found on this channel\n");
return ret;
} else
dev_info(max77693->dev, "device ID: 0x%x\n", reg_data);
max77693->i2c_muic = i2c_new_dummy_device(i2c->adapter, I2C_ADDR_MUIC);
if (IS_ERR(max77693->i2c_muic)) {
dev_err(max77693->dev, "Failed to allocate I2C device for MUIC\n");
return PTR_ERR(max77693->i2c_muic);
}
i2c_set_clientdata(max77693->i2c_muic, max77693);
max77693->i2c_haptic = i2c_new_dummy_device(i2c->adapter, I2C_ADDR_HAPTIC);
if (IS_ERR(max77693->i2c_haptic)) {
dev_err(max77693->dev, "Failed to allocate I2C device for Haptic\n");
ret = PTR_ERR(max77693->i2c_haptic);
goto err_i2c_haptic;
}
i2c_set_clientdata(max77693->i2c_haptic, max77693);
max77693->regmap_haptic = devm_regmap_init_i2c(max77693->i2c_haptic,
&max77693_regmap_haptic_config);
if (IS_ERR(max77693->regmap_haptic)) {
ret = PTR_ERR(max77693->regmap_haptic);
dev_err(max77693->dev,
"failed to initialize haptic register map: %d\n", ret);
goto err_regmap;
}
/*
* Initialize register map for MUIC device because use regmap-muic
* instance of MUIC device when irq of max77693 is initialized
* before call max77693-muic probe() function.
*/
max77693->regmap_muic = devm_regmap_init_i2c(max77693->i2c_muic,
&max77693_regmap_muic_config);
if (IS_ERR(max77693->regmap_muic)) {
ret = PTR_ERR(max77693->regmap_muic);
dev_err(max77693->dev,
"failed to allocate register map: %d\n", ret);
goto err_regmap;
}
ret = regmap_add_irq_chip(max77693->regmap, max77693->irq,
IRQF_ONESHOT | IRQF_SHARED, 0,
&max77693_led_irq_chip,
&max77693->irq_data_led);
if (ret) {
dev_err(max77693->dev, "failed to add irq chip: %d\n", ret);
goto err_regmap;
}
ret = regmap_add_irq_chip(max77693->regmap, max77693->irq,
IRQF_ONESHOT | IRQF_SHARED, 0,
&max77693_topsys_irq_chip,
&max77693->irq_data_topsys);
if (ret) {
dev_err(max77693->dev, "failed to add irq chip: %d\n", ret);
goto err_irq_topsys;
}
ret = regmap_add_irq_chip(max77693->regmap, max77693->irq,
IRQF_ONESHOT | IRQF_SHARED, 0,
&max77693_charger_irq_chip,
&max77693->irq_data_chg);
if (ret) {
dev_err(max77693->dev, "failed to add irq chip: %d\n", ret);
goto err_irq_charger;
}
ret = regmap_add_irq_chip(max77693->regmap_muic, max77693->irq,
IRQF_ONESHOT | IRQF_SHARED, 0,
&max77693_muic_irq_chip,
&max77693->irq_data_muic);
if (ret) {
dev_err(max77693->dev, "failed to add irq chip: %d\n", ret);
goto err_irq_muic;
}
/* Unmask interrupts from all blocks in interrupt source register */
ret = regmap_update_bits(max77693->regmap,
MAX77693_PMIC_REG_INTSRC_MASK,
SRC_IRQ_ALL, (unsigned int)~SRC_IRQ_ALL);
if (ret < 0) {
dev_err(max77693->dev,
"Could not unmask interrupts in INTSRC: %d\n",
ret);
goto err_intsrc;
}
pm_runtime_set_active(max77693->dev);
ret = mfd_add_devices(max77693->dev, -1, max77693_devs,
ARRAY_SIZE(max77693_devs), NULL, 0, NULL);
if (ret < 0)
goto err_mfd;
return ret;
err_mfd:
mfd_remove_devices(max77693->dev);
err_intsrc:
regmap_del_irq_chip(max77693->irq, max77693->irq_data_muic);
err_irq_muic:
regmap_del_irq_chip(max77693->irq, max77693->irq_data_chg);
err_irq_charger:
regmap_del_irq_chip(max77693->irq, max77693->irq_data_topsys);
err_irq_topsys:
regmap_del_irq_chip(max77693->irq, max77693->irq_data_led);
err_regmap:
i2c_unregister_device(max77693->i2c_haptic);
err_i2c_haptic:
i2c_unregister_device(max77693->i2c_muic);
return ret;
}
static int max77693_i2c_remove(struct i2c_client *i2c)
{
struct max77693_dev *max77693 = i2c_get_clientdata(i2c);
mfd_remove_devices(max77693->dev);
regmap_del_irq_chip(max77693->irq, max77693->irq_data_muic);
regmap_del_irq_chip(max77693->irq, max77693->irq_data_chg);
regmap_del_irq_chip(max77693->irq, max77693->irq_data_topsys);
regmap_del_irq_chip(max77693->irq, max77693->irq_data_led);
i2c_unregister_device(max77693->i2c_muic);
i2c_unregister_device(max77693->i2c_haptic);
return 0;
}
static const struct i2c_device_id max77693_i2c_id[] = {
{ "max77693", TYPE_MAX77693 },
{ }
};
MODULE_DEVICE_TABLE(i2c, max77693_i2c_id);
static int max77693_suspend(struct device *dev)
{
struct i2c_client *i2c = to_i2c_client(dev);
struct max77693_dev *max77693 = i2c_get_clientdata(i2c);
if (device_may_wakeup(dev)) {
enable_irq_wake(max77693->irq);
disable_irq(max77693->irq);
}
return 0;
}
static int max77693_resume(struct device *dev)
{
struct i2c_client *i2c = to_i2c_client(dev);
struct max77693_dev *max77693 = i2c_get_clientdata(i2c);
if (device_may_wakeup(dev)) {
disable_irq_wake(max77693->irq);
enable_irq(max77693->irq);
}
return 0;
}
static const struct dev_pm_ops max77693_pm = {
.suspend = max77693_suspend,
.resume = max77693_resume,
};
#ifdef CONFIG_OF
static const struct of_device_id max77693_dt_match[] = {
{ .compatible = "maxim,max77693" },
{},
};
MODULE_DEVICE_TABLE(of, max77693_dt_match);
#endif
static struct i2c_driver max77693_i2c_driver = {
.driver = {
.name = "max77693",
.pm = &max77693_pm,
.of_match_table = of_match_ptr(max77693_dt_match),
},
.probe = max77693_i2c_probe,
.remove = max77693_i2c_remove,
.id_table = max77693_i2c_id,
};
module_i2c_driver(max77693_i2c_driver);
MODULE_DESCRIPTION("MAXIM 77693 multi-function core driver");
MODULE_AUTHOR("SangYoung, Son <hello.son@samsung.com>");
MODULE_LICENSE("GPL");
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