[deliverable/linux.git] / drivers / mfd / intel_soc_pmic_core.c

/*
 * 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"

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, GPIOD_IN);
	if (IS_ERR(desc))
		return PTR_ERR(desc);

	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);
	if (!pmic)
		return -ENOMEM;

	dev_set_drvdata(dev, pmic);

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

	/*
	 * On some boards the PMIC interrupt may come from a GPIO line. Try to
	 * lookup the ACPI table for a such connection and setup a GPIO
	 * interrupt if it exists. Otherwise use the IRQ provided by I2C
	 */
	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;
}

#if defined(CONFIG_PM_SLEEP)
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;
}
#endif

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);

#if defined(CONFIG_ACPI)
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);
#endif

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>");
Commit	Line	Data
51652384 ZL	1	/*
	2	* intel_soc_pmic_core.c - Intel SoC PMIC MFD Driver
	3	*
	4	* Copyright (C) 2013, 2014 Intel Corporation. All rights reserved.
	5	*
	6	* This program is free software; you can redistribute it and/or
	7	* modify it under the terms of the GNU General Public License version
	8	* 2 as published by the Free Software Foundation.
	9	*
	10	* This program is distributed in the hope that it will be useful,
	11	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	12	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	13	* GNU General Public License for more details.
	14	*
	15	* Author: Yang, Bin <bin.yang@intel.com>
	16	* Author: Zhu, Lejun <lejun.zhu@linux.intel.com>
	17	*/
	18
	19	#include <linux/module.h>
	20	#include <linux/mfd/core.h>
	21	#include <linux/i2c.h>
	22	#include <linux/interrupt.h>
	23	#include <linux/gpio/consumer.h>
	24	#include <linux/acpi.h>
	25	#include <linux/regmap.h>
	26	#include <linux/mfd/intel_soc_pmic.h>
	27	#include "intel_soc_pmic_core.h"
	28
51652384 ZL	29	static int intel_soc_pmic_find_gpio_irq(struct device *dev)
	30	{
	31	struct gpio_desc *desc;
	32	int irq;
	33
9dc50219	34	desc = devm_gpiod_get_index(dev, "intel_soc_pmic", 0, GPIOD_IN);
51652384	35	if (IS_ERR(desc))
ad7b5a17	36	return PTR_ERR(desc);
51652384 ZL	37
	38	irq = gpiod_to_irq(desc);
	39	if (irq < 0)
	40	dev_warn(dev, "Can't get irq: %d\n", irq);
	41
	42	return irq;
	43	}
	44
	45	static int intel_soc_pmic_i2c_probe(struct i2c_client *i2c,
	46	const struct i2c_device_id *i2c_id)
	47	{
	48	struct device *dev = &i2c->dev;
	49	const struct acpi_device_id *id;
	50	struct intel_soc_pmic_config *config;
	51	struct intel_soc_pmic *pmic;
	52	int ret;
	53	int irq;
	54
	55	id = acpi_match_device(dev->driver->acpi_match_table, dev);
	56	if (!id \|\| !id->driver_data)
	57	return -ENODEV;
	58
	59	config = (struct intel_soc_pmic_config *)id->driver_data;
	60
	61	pmic = devm_kzalloc(dev, sizeof(*pmic), GFP_KERNEL);
0a65fbf6 KP	62	if (!pmic)
	63	return -ENOMEM;
	64
51652384 ZL	65	dev_set_drvdata(dev, pmic);
	66
	67	pmic->regmap = devm_regmap_init_i2c(i2c, config->regmap_config);
	68
9c98dcb0 JN	69	/*
	70	* On some boards the PMIC interrupt may come from a GPIO line. Try to
	71	* lookup the ACPI table for a such connection and setup a GPIO
	72	* interrupt if it exists. Otherwise use the IRQ provided by I2C
	73	*/
51652384 ZL	74	irq = intel_soc_pmic_find_gpio_irq(dev);
	75	pmic->irq = (irq < 0) ? i2c->irq : irq;
	76
	77	ret = regmap_add_irq_chip(pmic->regmap, pmic->irq,
	78	config->irq_flags \| IRQF_ONESHOT,
	79	0, config->irq_chip,
	80	&pmic->irq_chip_data);
	81	if (ret)
	82	return ret;
	83
	84	ret = enable_irq_wake(pmic->irq);
	85	if (ret)
	86	dev_warn(dev, "Can't enable IRQ as wake source: %d\n", ret);
	87
	88	ret = mfd_add_devices(dev, -1, config->cell_dev,
	89	config->n_cell_devs, NULL, 0,
	90	regmap_irq_get_domain(pmic->irq_chip_data));
	91	if (ret)
	92	goto err_del_irq_chip;
	93
	94	return 0;
	95
	96	err_del_irq_chip:
	97	regmap_del_irq_chip(pmic->irq, pmic->irq_chip_data);
	98	return ret;
	99	}
	100
	101	static int intel_soc_pmic_i2c_remove(struct i2c_client *i2c)
	102	{
	103	struct intel_soc_pmic *pmic = dev_get_drvdata(&i2c->dev);
	104
	105	regmap_del_irq_chip(pmic->irq, pmic->irq_chip_data);
	106
	107	mfd_remove_devices(&i2c->dev);
	108
	109	return 0;
	110	}
	111
	112	static void intel_soc_pmic_shutdown(struct i2c_client *i2c)
	113	{
	114	struct intel_soc_pmic *pmic = dev_get_drvdata(&i2c->dev);
	115
	116	disable_irq(pmic->irq);
	117
	118	return;
	119	}
	120
bdaf6703	121	#if defined(CONFIG_PM_SLEEP)
51652384 ZL	122	static int intel_soc_pmic_suspend(struct device *dev)
	123	{
	124	struct intel_soc_pmic *pmic = dev_get_drvdata(dev);
	125
	126	disable_irq(pmic->irq);
	127
	128	return 0;
	129	}
	130
	131	static int intel_soc_pmic_resume(struct device *dev)
	132	{
	133	struct intel_soc_pmic *pmic = dev_get_drvdata(dev);
	134
	135	enable_irq(pmic->irq);
	136
	137	return 0;
	138	}
bdaf6703	139	#endif
51652384 ZL	140
	141	static SIMPLE_DEV_PM_OPS(intel_soc_pmic_pm_ops, intel_soc_pmic_suspend,
	142	intel_soc_pmic_resume);
	143
	144	static const struct i2c_device_id intel_soc_pmic_i2c_id[] = {
	145	{ }
	146	};
	147	MODULE_DEVICE_TABLE(i2c, intel_soc_pmic_i2c_id);
	148
52764fd9	149	#if defined(CONFIG_ACPI)
51652384 ZL	150	static struct acpi_device_id intel_soc_pmic_acpi_match[] = {
	151	{"INT33FD", (kernel_ulong_t)&intel_soc_pmic_config_crc},
	152	{ },
	153	};
	154	MODULE_DEVICE_TABLE(acpi, intel_soc_pmic_acpi_match);
52764fd9	155	#endif
51652384 ZL	156
	157	static struct i2c_driver intel_soc_pmic_i2c_driver = {
	158	.driver = {
	159	.name = "intel_soc_pmic_i2c",
	160	.owner = THIS_MODULE,
	161	.pm = &intel_soc_pmic_pm_ops,
	162	.acpi_match_table = ACPI_PTR(intel_soc_pmic_acpi_match),
	163	},
	164	.probe = intel_soc_pmic_i2c_probe,
	165	.remove = intel_soc_pmic_i2c_remove,
	166	.id_table = intel_soc_pmic_i2c_id,
	167	.shutdown = intel_soc_pmic_shutdown,
	168	};
	169
	170	module_i2c_driver(intel_soc_pmic_i2c_driver);
	171
	172	MODULE_DESCRIPTION("I2C driver for Intel SoC PMIC");
	173	MODULE_LICENSE("GPL v2");
	174	MODULE_AUTHOR("Yang, Bin <bin.yang@intel.com>");
	175	MODULE_AUTHOR("Zhu, Lejun <lejun.zhu@linux.intel.com>");