drivers/mfd/max14577.c - arm/linux-arm-legacy - Git at Google

 /*
  * max14577.c - mfd core driver for the Maxim 14577
  *
  * Copyright (C) 2013 Samsung Electrnoics
  * Chanwoo Choi <cw00.choi@samsung.com>
  * Krzysztof Kozlowski <k.kozlowski@samsung.com>
  *
  * This program is free software; you can redistribute it and/or modify
  * it under the terms of the GNU General Public License as published by
  * the Free Software Foundation; either version 2 of the License, or
  * (at your option) any later version.
  *
  * This program is distributed in the hope that it will be useful,
  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  * GNU General Public License for more details.
  *
  * This driver is based on max8997.c
  */

 #include <linux/module.h>
 #include <linux/interrupt.h>
 #include <linux/mfd/core.h>
 #include <linux/mfd/max14577.h>
 #include <linux/mfd/max14577-private.h>

 static struct mfd_cell max14577_devs[] = {
 	{ .name = "max14577-muic", },
 	{
 		.name = "max14577-regulator",
 		.of_compatible = "maxim,max14577-regulator",
 	},
 	{ .name = "max14577-charger", },
 };

 static bool max14577_volatile_reg(struct device *dev, unsigned int reg)
 {
 	switch (reg) {
 	case MAX14577_REG_INT1 ... MAX14577_REG_STATUS3:
 		return true;
 	default:
 		break;
 	}
 	return false;
 }

 static const struct regmap_config max14577_regmap_config = {
 	.reg_bits	= 8,
 	.val_bits	= 8,
 	.volatile_reg	= max14577_volatile_reg,
 	.max_register	= MAX14577_REG_END,
 };

 static const struct regmap_irq max14577_irqs[] = {
 	/* INT1 interrupts */
 	{ .reg_offset = 0, .mask = INT1_ADC_MASK, },
 	{ .reg_offset = 0, .mask = INT1_ADCLOW_MASK, },
 	{ .reg_offset = 0, .mask = INT1_ADCERR_MASK, },
 	/* INT2 interrupts */
 	{ .reg_offset = 1, .mask = INT2_CHGTYP_MASK, },
 	{ .reg_offset = 1, .mask = INT2_CHGDETRUN_MASK, },
 	{ .reg_offset = 1, .mask = INT2_DCDTMR_MASK, },
 	{ .reg_offset = 1, .mask = INT2_DBCHG_MASK, },
 	{ .reg_offset = 1, .mask = INT2_VBVOLT_MASK, },
 	/* INT3 interrupts */
 	{ .reg_offset = 2, .mask = INT3_EOC_MASK, },
 	{ .reg_offset = 2, .mask = INT3_CGMBC_MASK, },
 	{ .reg_offset = 2, .mask = INT3_OVP_MASK, },
 	{ .reg_offset = 2, .mask = INT3_MBCCHGERR_MASK, },
 };

 static const struct regmap_irq_chip max14577_irq_chip = {
 	.name			= "max14577",
 	.status_base		= MAX14577_REG_INT1,
 	.mask_base		= MAX14577_REG_INTMASK1,
 	.mask_invert		= 1,
 	.num_regs		= 3,
 	.irqs			= max14577_irqs,
 	.num_irqs		= ARRAY_SIZE(max14577_irqs),
 };

 static int max14577_i2c_probe(struct i2c_client *i2c,
 			      const struct i2c_device_id *id)
 {
 	struct max14577 *max14577;
 	struct max14577_platform_data *pdata = dev_get_platdata(&i2c->dev);
 	struct device_node *np = i2c->dev.of_node;
 	u8 reg_data;
 	int ret = 0;

 	if (np) {
 		pdata = devm_kzalloc(&i2c->dev, sizeof(*pdata), GFP_KERNEL);
 		if (!pdata)
 			return -ENOMEM;
 		i2c->dev.platform_data = pdata;
 	}

 	if (!pdata) {
 		dev_err(&i2c->dev, "No platform data found.\n");
 		return -EINVAL;
 	}

 	max14577 = devm_kzalloc(&i2c->dev, sizeof(*max14577), GFP_KERNEL);
 	if (!max14577)
 		return -ENOMEM;

 	i2c_set_clientdata(i2c, max14577);
 	max14577->dev = &i2c->dev;
 	max14577->i2c = i2c;
 	max14577->irq = i2c->irq;

 	max14577->regmap = devm_regmap_init_i2c(i2c, &max14577_regmap_config);
 	if (IS_ERR(max14577->regmap)) {
 		ret = PTR_ERR(max14577->regmap);
 		dev_err(max14577->dev, "Failed to allocate register map: %d\n",
 				ret);
 		return ret;
 	}

 	ret = max14577_read_reg(max14577->regmap, MAX14577_REG_DEVICEID,
 			&reg_data);
 	if (ret) {
 		dev_err(max14577->dev, "Device not found on this channel: %d\n",
 				ret);
 		return ret;
 	}
 	max14577->vendor_id = ((reg_data & DEVID_VENDORID_MASK) >>
 				DEVID_VENDORID_SHIFT);
 	max14577->device_id = ((reg_data & DEVID_DEVICEID_MASK) >>
 				DEVID_DEVICEID_SHIFT);
 	dev_info(max14577->dev, "Device ID: 0x%x, vendor: 0x%x\n",
 			max14577->device_id, max14577->vendor_id);

 	ret = regmap_add_irq_chip(max14577->regmap, max14577->irq,
 				  IRQF_TRIGGER_FALLING | IRQF_ONESHOT, 0,
 				  &max14577_irq_chip,
 				  &max14577->irq_data);
 	if (ret != 0) {
 		dev_err(&i2c->dev, "Failed to request IRQ %d: %d\n",
 				max14577->irq, ret);
 		return ret;
 	}

 	ret = mfd_add_devices(max14577->dev, -1, max14577_devs,
 			ARRAY_SIZE(max14577_devs), NULL, 0,
 			regmap_irq_get_domain(max14577->irq_data));
 	if (ret < 0)
 		goto err_mfd;

 	device_init_wakeup(max14577->dev, 1);

 	return 0;

 err_mfd:
 	regmap_del_irq_chip(max14577->irq, max14577->irq_data);

 	return ret;
 }

 static int max14577_i2c_remove(struct i2c_client *i2c)
 {
 	struct max14577 *max14577 = i2c_get_clientdata(i2c);

 	mfd_remove_devices(max14577->dev);
 	regmap_del_irq_chip(max14577->irq, max14577->irq_data);

 	return 0;
 }

 static const struct i2c_device_id max14577_i2c_id[] = {
 	{ "max14577", 0 },
 	{ }
 };
 MODULE_DEVICE_TABLE(i2c, max14577_i2c_id);

 #ifdef CONFIG_PM_SLEEP
 static int max14577_suspend(struct device *dev)
 {
 	struct i2c_client *i2c = container_of(dev, struct i2c_client, dev);
 	struct max14577 *max14577 = i2c_get_clientdata(i2c);

 	if (device_may_wakeup(dev)) {
 		enable_irq_wake(max14577->irq);
 		/*
 		 * MUIC IRQ must be disabled during suspend if this is
 		 * a wake up source because it will be handled before
 		 * resuming I2C.
 		 *
 		 * When device is woken up from suspend (e.g. by ADC change),
 		 * an interrupt occurs before resuming I2C bus controller.
 		 * Interrupt handler tries to read registers but this read
 		 * will fail because I2C is still suspended.
 		 */
 		disable_irq(max14577->irq);
 	}

 	return 0;
 }

 static int max14577_resume(struct device *dev)
 {
 	struct i2c_client *i2c = container_of(dev, struct i2c_client, dev);
 	struct max14577 *max14577 = i2c_get_clientdata(i2c);

 	if (device_may_wakeup(dev)) {
 		disable_irq_wake(max14577->irq);
 		enable_irq(max14577->irq);
 	}

 	return 0;
 }
 #endif /* CONFIG_PM_SLEEP */

 static struct of_device_id max14577_dt_match[] = {
 	{ .compatible = "maxim,max14577", },
 	{},
 };

 static SIMPLE_DEV_PM_OPS(max14577_pm, max14577_suspend, max14577_resume);

 static struct i2c_driver max14577_i2c_driver = {
 	.driver = {
 		.name = "max14577",
 		.owner = THIS_MODULE,
 		.pm = &max14577_pm,
 		.of_match_table = max14577_dt_match,
 	},
 	.probe = max14577_i2c_probe,
 	.remove = max14577_i2c_remove,
 	.id_table = max14577_i2c_id,
 };

 static int __init max14577_i2c_init(void)
 {
 	return i2c_add_driver(&max14577_i2c_driver);
 }
 subsys_initcall(max14577_i2c_init);

 static void __exit max14577_i2c_exit(void)
 {
 	i2c_del_driver(&max14577_i2c_driver);
 }
 module_exit(max14577_i2c_exit);

 MODULE_AUTHOR("Chanwoo Choi <cw00.choi@samsung.com>, Krzysztof Kozlowski <k.kozlowski@samsung.com>");
 MODULE_DESCRIPTION("MAXIM 14577 multi-function core driver");
 MODULE_LICENSE("GPL");
	/*
	* max14577.c - mfd core driver for the Maxim 14577
	*
	* Copyright (C) 2013 Samsung Electrnoics
	* Chanwoo Choi <cw00.choi@samsung.com>
	* Krzysztof Kozlowski <k.kozlowski@samsung.com>
	*
	* This program is free software; you can redistribute it and/or modify
	* it under the terms of the GNU General Public License as published by
	* the Free Software Foundation; either version 2 of the License, or
	* (at your option) any later version.
	*
	* This program is distributed in the hope that it will be useful,
	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	* GNU General Public License for more details.
	*
	* This driver is based on max8997.c
	*/

	#include <linux/module.h>
	#include <linux/interrupt.h>
	#include <linux/mfd/core.h>
	#include <linux/mfd/max14577.h>
	#include <linux/mfd/max14577-private.h>

	static struct mfd_cell max14577_devs[] = {
	{ .name = "max14577-muic", },
	{
	.name = "max14577-regulator",
	.of_compatible = "maxim,max14577-regulator",
	},
	{ .name = "max14577-charger", },
	};

	static bool max14577_volatile_reg(struct device *dev, unsigned int reg)
	{
	switch (reg) {
	case MAX14577_REG_INT1 ... MAX14577_REG_STATUS3:
	return true;
	default:
	break;
	}
	return false;
	}

	static const struct regmap_config max14577_regmap_config = {
	.reg_bits = 8,
	.val_bits = 8,
	.volatile_reg = max14577_volatile_reg,
	.max_register = MAX14577_REG_END,
	};

	static const struct regmap_irq max14577_irqs[] = {
	/* INT1 interrupts */
	{ .reg_offset = 0, .mask = INT1_ADC_MASK, },
	{ .reg_offset = 0, .mask = INT1_ADCLOW_MASK, },
	{ .reg_offset = 0, .mask = INT1_ADCERR_MASK, },
	/* INT2 interrupts */
	{ .reg_offset = 1, .mask = INT2_CHGTYP_MASK, },
	{ .reg_offset = 1, .mask = INT2_CHGDETRUN_MASK, },
	{ .reg_offset = 1, .mask = INT2_DCDTMR_MASK, },
	{ .reg_offset = 1, .mask = INT2_DBCHG_MASK, },
	{ .reg_offset = 1, .mask = INT2_VBVOLT_MASK, },
	/* INT3 interrupts */
	{ .reg_offset = 2, .mask = INT3_EOC_MASK, },
	{ .reg_offset = 2, .mask = INT3_CGMBC_MASK, },
	{ .reg_offset = 2, .mask = INT3_OVP_MASK, },
	{ .reg_offset = 2, .mask = INT3_MBCCHGERR_MASK, },
	};

	static const struct regmap_irq_chip max14577_irq_chip = {
	.name = "max14577",
	.status_base = MAX14577_REG_INT1,
	.mask_base = MAX14577_REG_INTMASK1,
	.mask_invert = 1,
	.num_regs = 3,
	.irqs = max14577_irqs,
	.num_irqs = ARRAY_SIZE(max14577_irqs),
	};

	static int max14577_i2c_probe(struct i2c_client *i2c,
	const struct i2c_device_id *id)
	{
	struct max14577 *max14577;
	struct max14577_platform_data *pdata = dev_get_platdata(&i2c->dev);
	struct device_node *np = i2c->dev.of_node;
	u8 reg_data;
	int ret = 0;

	if (np) {
	pdata = devm_kzalloc(&i2c->dev, sizeof(*pdata), GFP_KERNEL);
	if (!pdata)
	return -ENOMEM;
	i2c->dev.platform_data = pdata;
	}

	if (!pdata) {
	dev_err(&i2c->dev, "No platform data found.\n");
	return -EINVAL;
	}

	max14577 = devm_kzalloc(&i2c->dev, sizeof(*max14577), GFP_KERNEL);
	if (!max14577)
	return -ENOMEM;

	i2c_set_clientdata(i2c, max14577);
	max14577->dev = &i2c->dev;
	max14577->i2c = i2c;
	max14577->irq = i2c->irq;

	max14577->regmap = devm_regmap_init_i2c(i2c, &max14577_regmap_config);
	if (IS_ERR(max14577->regmap)) {
	ret = PTR_ERR(max14577->regmap);
	dev_err(max14577->dev, "Failed to allocate register map: %d\n",
	ret);
	return ret;
	}

	ret = max14577_read_reg(max14577->regmap, MAX14577_REG_DEVICEID,
	&reg_data);
	if (ret) {
	dev_err(max14577->dev, "Device not found on this channel: %d\n",
	ret);
	return ret;
	}
	max14577->vendor_id = ((reg_data & DEVID_VENDORID_MASK) >>
	DEVID_VENDORID_SHIFT);
	max14577->device_id = ((reg_data & DEVID_DEVICEID_MASK) >>
	DEVID_DEVICEID_SHIFT);
	dev_info(max14577->dev, "Device ID: 0x%x, vendor: 0x%x\n",
	max14577->device_id, max14577->vendor_id);

	ret = regmap_add_irq_chip(max14577->regmap, max14577->irq,
	IRQF_TRIGGER_FALLING \| IRQF_ONESHOT, 0,
	&max14577_irq_chip,
	&max14577->irq_data);
	if (ret != 0) {
	dev_err(&i2c->dev, "Failed to request IRQ %d: %d\n",
	max14577->irq, ret);
	return ret;
	}

	ret = mfd_add_devices(max14577->dev, -1, max14577_devs,
	ARRAY_SIZE(max14577_devs), NULL, 0,
	regmap_irq_get_domain(max14577->irq_data));
	if (ret < 0)
	goto err_mfd;

	device_init_wakeup(max14577->dev, 1);

	return 0;

	err_mfd:
	regmap_del_irq_chip(max14577->irq, max14577->irq_data);

	return ret;
	}

	static int max14577_i2c_remove(struct i2c_client *i2c)
	{
	struct max14577 *max14577 = i2c_get_clientdata(i2c);

	mfd_remove_devices(max14577->dev);
	regmap_del_irq_chip(max14577->irq, max14577->irq_data);

	return 0;
	}

	static const struct i2c_device_id max14577_i2c_id[] = {
	{ "max14577", 0 },
	{ }
	};
	MODULE_DEVICE_TABLE(i2c, max14577_i2c_id);

	#ifdef CONFIG_PM_SLEEP
	static int max14577_suspend(struct device *dev)
	{
	struct i2c_client *i2c = container_of(dev, struct i2c_client, dev);
	struct max14577 *max14577 = i2c_get_clientdata(i2c);

	if (device_may_wakeup(dev)) {
	enable_irq_wake(max14577->irq);
	/*
	* MUIC IRQ must be disabled during suspend if this is
	* a wake up source because it will be handled before
	* resuming I2C.
	*
	* When device is woken up from suspend (e.g. by ADC change),
	* an interrupt occurs before resuming I2C bus controller.
	* Interrupt handler tries to read registers but this read
	* will fail because I2C is still suspended.
	*/
	disable_irq(max14577->irq);
	}

	return 0;
	}

	static int max14577_resume(struct device *dev)
	{
	struct i2c_client *i2c = container_of(dev, struct i2c_client, dev);
	struct max14577 *max14577 = i2c_get_clientdata(i2c);

	if (device_may_wakeup(dev)) {
	disable_irq_wake(max14577->irq);
	enable_irq(max14577->irq);
	}

	return 0;
	}
	#endif /* CONFIG_PM_SLEEP */

	static struct of_device_id max14577_dt_match[] = {
	{ .compatible = "maxim,max14577", },
	{},
	};

	static SIMPLE_DEV_PM_OPS(max14577_pm, max14577_suspend, max14577_resume);

	static struct i2c_driver max14577_i2c_driver = {
	.driver = {
	.name = "max14577",
	.owner = THIS_MODULE,
	.pm = &max14577_pm,
	.of_match_table = max14577_dt_match,
	},
	.probe = max14577_i2c_probe,
	.remove = max14577_i2c_remove,
	.id_table = max14577_i2c_id,
	};

	static int __init max14577_i2c_init(void)
	{
	return i2c_add_driver(&max14577_i2c_driver);
	}
	subsys_initcall(max14577_i2c_init);

	static void __exit max14577_i2c_exit(void)
	{
	i2c_del_driver(&max14577_i2c_driver);
	}
	module_exit(max14577_i2c_exit);

	MODULE_AUTHOR("Chanwoo Choi <cw00.choi@samsung.com>, Krzysztof Kozlowski <k.kozlowski@samsung.com>");
	MODULE_DESCRIPTION("MAXIM 14577 multi-function core driver");
	MODULE_LICENSE("GPL");