// SPDX-License-Identifier: GPL-2.0-only/* * max8907.c - mfd driver for MAX8907 * * Copyright (C) 2010 Gyungoh Yoo <jack.yoo@maxim-ic.com> * Copyright (C) 2010-2012, NVIDIA CORPORATION. All rights reserved. */ #include <linux/err.h>#include <linux/i2c.h>#include <linux/init.h>#include <linux/interrupt.h>#include <linux/irq.h>#include <linux/mfd/core.h>#include <linux/mfd/max8907.h>#include <linux/module.h>#include <linux/of.h>#include <linux/regmap.h>#include <linux/slab.h> static const struct mfd_cell max8907_cells[] = {	{ .name = "max8907-regulator", },	{ .name = "max8907-rtc", },}; static bool max8907_gen_is_volatile_reg(struct device *dev, unsigned int reg){	switch (reg) {	case MAX8907_REG_ON_OFF_IRQ1:	case MAX8907_REG_ON_OFF_STAT:	case MAX8907_REG_ON_OFF_IRQ2:	case MAX8907_REG_CHG_IRQ1:	case MAX8907_REG_CHG_IRQ2:	case MAX8907_REG_CHG_STAT:		return true;	default:		return false;	}} static bool max8907_gen_is_precious_reg(struct device *dev, unsigned int reg){	switch (reg) {	case MAX8907_REG_ON_OFF_IRQ1:	case MAX8907_REG_ON_OFF_IRQ2:	case MAX8907_REG_CHG_IRQ1:	case MAX8907_REG_CHG_IRQ2:		return true;	default:		return false;	}} static bool max8907_gen_is_writeable_reg(struct device *dev, unsigned int reg){	return !max8907_gen_is_volatile_reg(dev, reg);} static const struct regmap_config max8907_regmap_gen_config = {	.reg_bits = 8,	.val_bits = 8,	.volatile_reg = max8907_gen_is_volatile_reg,	.precious_reg = max8907_gen_is_precious_reg,	.writeable_reg = max8907_gen_is_writeable_reg,	.max_register = MAX8907_REG_LDO20VOUT,	.cache_type = REGCACHE_MAPLE,}; static bool max8907_rtc_is_volatile_reg(struct device *dev, unsigned int reg){	if (reg <= MAX8907_REG_RTC_YEAR2)		return true; 	switch (reg) {	case MAX8907_REG_RTC_STATUS:	case MAX8907_REG_RTC_IRQ:		return true;	default:		return false;	}} static bool max8907_rtc_is_precious_reg(struct device *dev, unsigned int reg){	switch (reg) {	case MAX8907_REG_RTC_IRQ:		return true;	default:		return false;	}} static bool max8907_rtc_is_writeable_reg(struct device *dev, unsigned int reg){	switch (reg) {	case MAX8907_REG_RTC_STATUS:	case MAX8907_REG_RTC_IRQ:		return false;	default:		return true;	}} static const struct regmap_config max8907_regmap_rtc_config = {	.reg_bits = 8,	.val_bits = 8,	.volatile_reg = max8907_rtc_is_volatile_reg,	.precious_reg = max8907_rtc_is_precious_reg,	.writeable_reg = max8907_rtc_is_writeable_reg,	.max_register = MAX8907_REG_MPL_CNTL,	.cache_type = REGCACHE_MAPLE,}; static const struct regmap_irq max8907_chg_irqs[] = {	{ .reg_offset = 0, .mask = 1 << 0, },	{ .reg_offset = 0, .mask = 1 << 1, },	{ .reg_offset = 0, .mask = 1 << 2, },	{ .reg_offset = 1, .mask = 1 << 0, },	{ .reg_offset = 1, .mask = 1 << 1, },	{ .reg_offset = 1, .mask = 1 << 2, },	{ .reg_offset = 1, .mask = 1 << 3, },	{ .reg_offset = 1, .mask = 1 << 4, },	{ .reg_offset = 1, .mask = 1 << 5, },	{ .reg_offset = 1, .mask = 1 << 6, },	{ .reg_offset = 1, .mask = 1 << 7, },}; static const struct regmap_irq_chip max8907_chg_irq_chip = {	.name = "max8907 chg",	.status_base = MAX8907_REG_CHG_IRQ1,	.mask_base = MAX8907_REG_CHG_IRQ1_MASK,	.wake_base = MAX8907_REG_CHG_IRQ1_MASK,	.irq_reg_stride = MAX8907_REG_CHG_IRQ2 - MAX8907_REG_CHG_IRQ1,	.num_regs = 2,	.irqs = max8907_chg_irqs,	.num_irqs = ARRAY_SIZE(max8907_chg_irqs),}; static const struct regmap_irq max8907_on_off_irqs[] = {	{ .reg_offset = 0, .mask = 1 << 0, },	{ .reg_offset = 0, .mask = 1 << 1, },	{ .reg_offset = 0, .mask = 1 << 2, },	{ .reg_offset = 0, .mask = 1 << 3, },	{ .reg_offset = 0, .mask = 1 << 4, },	{ .reg_offset = 0, .mask = 1 << 5, },	{ .reg_offset = 0, .mask = 1 << 6, },	{ .reg_offset = 0, .mask = 1 << 7, },	{ .reg_offset = 1, .mask = 1 << 0, },	{ .reg_offset = 1, .mask = 1 << 1, },}; static const struct regmap_irq_chip max8907_on_off_irq_chip = {	.name = "max8907 on_off",	.status_base = MAX8907_REG_ON_OFF_IRQ1,	.mask_base = MAX8907_REG_ON_OFF_IRQ1_MASK,	.irq_reg_stride = MAX8907_REG_ON_OFF_IRQ2 - MAX8907_REG_ON_OFF_IRQ1,	.num_regs = 2,	.irqs = max8907_on_off_irqs,	.num_irqs = ARRAY_SIZE(max8907_on_off_irqs),}; static const struct regmap_irq max8907_rtc_irqs[] = {	{ .reg_offset = 0, .mask = 1 << 2, },	{ .reg_offset = 0, .mask = 1 << 3, },}; static const struct regmap_irq_chip max8907_rtc_irq_chip = {	.name = "max8907 rtc",	.status_base = MAX8907_REG_RTC_IRQ,	.mask_base = MAX8907_REG_RTC_IRQ_MASK,	.num_regs = 1,	.irqs = max8907_rtc_irqs,	.num_irqs = ARRAY_SIZE(max8907_rtc_irqs),}; static struct max8907 *max8907_pm_off;static void max8907_power_off(void){	regmap_update_bits(max8907_pm_off->regmap_gen, MAX8907_REG_RESET_CNFG,			MAX8907_MASK_POWER_OFF, MAX8907_MASK_POWER_OFF);} static int max8907_i2c_probe(struct i2c_client *i2c){	struct max8907 *max8907;	int ret;	struct max8907_platform_data *pdata = dev_get_platdata(&i2c->dev);	bool pm_off = false; 	if (pdata)		pm_off = pdata->pm_off;	else if (i2c->dev.of_node)		pm_off = of_property_read_bool(i2c->dev.of_node,					"maxim,system-power-controller"); 	max8907 = devm_kzalloc(&i2c->dev, sizeof(struct max8907), GFP_KERNEL);	if (!max8907) {		ret = -ENOMEM;		goto err_alloc_drvdata;	} 	max8907->dev = &i2c->dev;	max8907->i2c_gen = i2c;	i2c_set_clientdata(i2c, max8907);	max8907->regmap_gen = devm_regmap_init_i2c(i2c,						&max8907_regmap_gen_config);	if (IS_ERR(max8907->regmap_gen)) {		ret = PTR_ERR(max8907->regmap_gen);		dev_err(&i2c->dev, "gen regmap init failed: %d\n", ret);		goto err_regmap_gen;	} 	max8907->i2c_rtc = i2c_new_dummy_device(i2c->adapter, MAX8907_RTC_I2C_ADDR);	if (IS_ERR(max8907->i2c_rtc)) {		ret = PTR_ERR(max8907->i2c_rtc);		goto err_dummy_rtc;	}	i2c_set_clientdata(max8907->i2c_rtc, max8907);	max8907->regmap_rtc = devm_regmap_init_i2c(max8907->i2c_rtc,						&max8907_regmap_rtc_config);	if (IS_ERR(max8907->regmap_rtc)) {		ret = PTR_ERR(max8907->regmap_rtc);		dev_err(&i2c->dev, "rtc regmap init failed: %d\n", ret);		goto err_regmap_rtc;	} 	ret = regmap_add_irq_chip(max8907->regmap_gen, max8907->i2c_gen->irq,				  IRQF_ONESHOT | IRQF_SHARED,				  -1, &max8907_chg_irq_chip,				  &max8907->irqc_chg);	if (ret != 0) {		dev_err(&i2c->dev, "failed to add chg irq chip: %d\n", ret);		goto err_irqc_chg;	}	ret = regmap_add_irq_chip(max8907->regmap_gen, max8907->i2c_gen->irq,				  IRQF_ONESHOT | IRQF_SHARED, -1,				  &max8907_on_off_irq_chip,				  &max8907->irqc_on_off);	if (ret != 0) {		dev_err(&i2c->dev, "failed to add on off irq chip: %d\n", ret);		goto err_irqc_on_off;	}	ret = regmap_add_irq_chip(max8907->regmap_rtc, max8907->i2c_gen->irq,				  IRQF_ONESHOT | IRQF_SHARED, -1,				  &max8907_rtc_irq_chip,				  &max8907->irqc_rtc);	if (ret != 0) {		dev_err(&i2c->dev, "failed to add rtc irq chip: %d\n", ret);		goto err_irqc_rtc;	} 	ret = mfd_add_devices(max8907->dev, -1, max8907_cells,			      ARRAY_SIZE(max8907_cells), NULL, 0, NULL);	if (ret != 0) {		dev_err(&i2c->dev, "failed to add MFD devices %d\n", ret);		goto err_add_devices;	} 	if (pm_off && !pm_power_off) {		max8907_pm_off = max8907;		pm_power_off = max8907_power_off;	} 	return 0; err_add_devices:	regmap_del_irq_chip(max8907->i2c_gen->irq, max8907->irqc_rtc);err_irqc_rtc:	regmap_del_irq_chip(max8907->i2c_gen->irq, max8907->irqc_on_off);err_irqc_on_off:	regmap_del_irq_chip(max8907->i2c_gen->irq, max8907->irqc_chg);err_irqc_chg:err_regmap_rtc:	i2c_unregister_device(max8907->i2c_rtc);err_dummy_rtc:err_regmap_gen:err_alloc_drvdata:	return ret;} static void max8907_i2c_remove(struct i2c_client *i2c){	struct max8907 *max8907 = i2c_get_clientdata(i2c); 	mfd_remove_devices(max8907->dev); 	regmap_del_irq_chip(max8907->i2c_gen->irq, max8907->irqc_rtc);	regmap_del_irq_chip(max8907->i2c_gen->irq, max8907->irqc_on_off);	regmap_del_irq_chip(max8907->i2c_gen->irq, max8907->irqc_chg); 	i2c_unregister_device(max8907->i2c_rtc);} #ifdef CONFIG_OFstatic const struct of_device_id max8907_of_match[] = {	{ .compatible = "maxim,max8907" },	{ },};MODULE_DEVICE_TABLE(of, max8907_of_match);#endif static const struct i2c_device_id max8907_i2c_id[] = {	{ "max8907" },	{}};MODULE_DEVICE_TABLE(i2c, max8907_i2c_id); static struct i2c_driver max8907_i2c_driver = {	.driver = {		.name = "max8907",		.of_match_table = of_match_ptr(max8907_of_match),	},	.probe = max8907_i2c_probe,	.remove = max8907_i2c_remove,	.id_table = max8907_i2c_id,}; static int __init max8907_i2c_init(void){	int ret = -ENODEV; 	ret = i2c_add_driver(&max8907_i2c_driver);	if (ret != 0)		pr_err("Failed to register I2C driver: %d\n", ret); 	return ret;}subsys_initcall(max8907_i2c_init); static void __exit max8907_i2c_exit(void){	i2c_del_driver(&max8907_i2c_driver);}module_exit(max8907_i2c_exit); MODULE_DESCRIPTION("MAX8907 multi-function core driver");MODULE_AUTHOR("Gyungoh Yoo <jack.yoo@maxim-ic.com>");MODULE_LICENSE("GPL v2");