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/*
* 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);
#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>");
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