mfd: intel_soc_pmic: Core driver

/*

 * intel_soc_pmic_core.c - Intel SoC PMIC MFD Driver

 *

 * Copyright (C) 2013, 2014 Intel Corporation. All rights reserved.

 *

 * This program is free software; you can redistribute it and/or

 * modify it under the terms of the GNU General Public License version

 * 2 as published by the Free Software Foundation.

 *

 * 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.

 *

 * Author: Yang, Bin <bin.yang@intel.com>

 * Author: Zhu, Lejun <lejun.zhu@linux.intel.com>

 */

#include <linux/module.h>

#include <linux/mfd/core.h>

#include <linux/i2c.h>

#include <linux/interrupt.h>

#include <linux/gpio/consumer.h>

#include <linux/acpi.h>

#include <linux/regmap.h>

#include <linux/mfd/intel_soc_pmic.h>

#include "intel_soc_pmic_core.h"

/*

 * On some boards the PMIC interrupt may come from a GPIO line.

 * Try to lookup the ACPI table and see if such connection exists. If not,

 * return -ENOENT and use the IRQ provided by I2C.

 */

static int intel_soc_pmic_find_gpio_irq(struct device *dev)

{

	struct gpio_desc *desc;

	int irq;

	desc = devm_gpiod_get_index(dev, "intel_soc_pmic", 0);

	if (IS_ERR(desc))

		return -ENOENT;

	irq = gpiod_to_irq(desc);

	if (irq < 0)

		dev_warn(dev, "Can't get irq: %d\n", irq);

	return irq;

}

static int intel_soc_pmic_i2c_probe(struct i2c_client *i2c,

				    const struct i2c_device_id *i2c_id)

{

	struct device *dev = &i2c->dev;

	const struct acpi_device_id *id;

	struct intel_soc_pmic_config *config;

	struct intel_soc_pmic *pmic;

	int ret;

	int irq;

	id = acpi_match_device(dev->driver->acpi_match_table, dev);

	if (!id || !id->driver_data)

		return -ENODEV;

	config = (struct intel_soc_pmic_config *)id->driver_data;

	pmic = devm_kzalloc(dev, sizeof(*pmic), GFP_KERNEL);

	dev_set_drvdata(dev, pmic);

	pmic->regmap = devm_regmap_init_i2c(i2c, config->regmap_config);

	irq = intel_soc_pmic_find_gpio_irq(dev);

	pmic->irq = (irq < 0) ? i2c->irq : irq;

	ret = regmap_add_irq_chip(pmic->regmap, pmic->irq,

				  config->irq_flags | IRQF_ONESHOT,

				  0, config->irq_chip,

				  &pmic->irq_chip_data);

	if (ret)

		return ret;

	ret = enable_irq_wake(pmic->irq);

	if (ret)

		dev_warn(dev, "Can't enable IRQ as wake source: %d\n", ret);

	ret = mfd_add_devices(dev, -1, config->cell_dev,

			      config->n_cell_devs, NULL, 0,

			      regmap_irq_get_domain(pmic->irq_chip_data));

	if (ret)

		goto err_del_irq_chip;

	return 0;

err_del_irq_chip:

	regmap_del_irq_chip(pmic->irq, pmic->irq_chip_data);

	return ret;

}

static int intel_soc_pmic_i2c_remove(struct i2c_client *i2c)

{

	struct intel_soc_pmic *pmic = dev_get_drvdata(&i2c->dev);

	regmap_del_irq_chip(pmic->irq, pmic->irq_chip_data);

	mfd_remove_devices(&i2c->dev);

	return 0;

}

static void intel_soc_pmic_shutdown(struct i2c_client *i2c)

{

	struct intel_soc_pmic *pmic = dev_get_drvdata(&i2c->dev);

	disable_irq(pmic->irq);

	return;

}

static int intel_soc_pmic_suspend(struct device *dev)

{

	struct intel_soc_pmic *pmic = dev_get_drvdata(dev);

	disable_irq(pmic->irq);

	return 0;

}

static int intel_soc_pmic_resume(struct device *dev)

{

	struct intel_soc_pmic *pmic = dev_get_drvdata(dev);

	enable_irq(pmic->irq);

	return 0;

}

static SIMPLE_DEV_PM_OPS(intel_soc_pmic_pm_ops, intel_soc_pmic_suspend,

			 intel_soc_pmic_resume);

static const struct i2c_device_id intel_soc_pmic_i2c_id[] = {

	{ }

};

MODULE_DEVICE_TABLE(i2c, intel_soc_pmic_i2c_id);

static struct acpi_device_id intel_soc_pmic_acpi_match[] = {

	{"INT33FD", (kernel_ulong_t)&intel_soc_pmic_config_crc},

	{ },

};

MODULE_DEVICE_TABLE(acpi, intel_soc_pmic_acpi_match);

static struct i2c_driver intel_soc_pmic_i2c_driver = {

	.driver = {

		.name = "intel_soc_pmic_i2c",

		.owner = THIS_MODULE,

		.pm = &intel_soc_pmic_pm_ops,

		.acpi_match_table = ACPI_PTR(intel_soc_pmic_acpi_match),

	},

	.probe = intel_soc_pmic_i2c_probe,

	.remove = intel_soc_pmic_i2c_remove,

	.id_table = intel_soc_pmic_i2c_id,

	.shutdown = intel_soc_pmic_shutdown,

};

module_i2c_driver(intel_soc_pmic_i2c_driver);

MODULE_DESCRIPTION("I2C driver for Intel SoC PMIC");

MODULE_LICENSE("GPL v2");

MODULE_AUTHOR("Yang, Bin <bin.yang@intel.com>");

MODULE_AUTHOR("Zhu, Lejun <lejun.zhu@linux.intel.com>");

/*

 * intel_soc_pmic_core.h - Intel SoC PMIC MFD Driver

 *

 * Copyright (C) 2012-2014 Intel Corporation. All rights reserved.

 *

 * This program is free software; you can redistribute it and/or

 * modify it under the terms of the GNU General Public License version

 * 2 as published by the Free Software Foundation.

 *

 * 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.

 *

 * Author: Yang, Bin <bin.yang@intel.com>

 * Author: Zhu, Lejun <lejun.zhu@linux.intel.com>

 */

#ifndef __INTEL_SOC_PMIC_CORE_H__

#define __INTEL_SOC_PMIC_CORE_H__

struct intel_soc_pmic_config {

	unsigned long irq_flags;

	struct mfd_cell *cell_dev;

	int n_cell_devs;

	struct regmap_config *regmap_config;

	struct regmap_irq_chip *irq_chip;

};

extern struct intel_soc_pmic_config intel_soc_pmic_config_crc;

#endif	/* __INTEL_SOC_PMIC_CORE_H__ */

/*

 * intel_soc_pmic.h - Intel SoC PMIC Driver

 *

 * Copyright (C) 2012-2014 Intel Corporation. All rights reserved.

 *

 * This program is free software; you can redistribute it and/or

 * modify it under the terms of the GNU General Public License version

 * 2 as published by the Free Software Foundation.

 *

 * 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.

 *

 * Author: Yang, Bin <bin.yang@intel.com>

 * Author: Zhu, Lejun <lejun.zhu@linux.intel.com>

 */

#ifndef __INTEL_SOC_PMIC_H__

#define __INTEL_SOC_PMIC_H__

#include <linux/regmap.h>

struct intel_soc_pmic {

	int irq;

	struct regmap *regmap;

	struct regmap_irq_chip_data *irq_chip_data;

};

#endif	/* __INTEL_SOC_PMIC_H__ */