/*
 * 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 <linux/gpio/machine.h>
#include <linux/pwm.h>
#include "intel_soc_pmic_core.h"

/* Lookup table for the Panel Enable/Disable line as GPIO signals */
static struct gpiod_lookup_table panel_gpio_table = {
        /* Intel GFX is consumer */
        .dev_id = "0000:00:02.0",
        .table = {
                /* Panel EN/DISABLE */
                GPIO_LOOKUP("gpio_crystalcove", 94, "panel", GPIO_ACTIVE_HIGH),
        },
};

/* PWM consumed by the Intel GFX */
static struct pwm_lookup crc_pwm_lookup[] = {
        PWM_LOOKUP("crystal_cove_pwm", 0, "0000:00:02.0", "pwm_backlight", 0, PWM_POLARITY_NORMAL),
};

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);

        /* Add lookup table binding for Panel Control to the GPIO Chip */
        gpiod_add_lookup_table(&panel_gpio_table);

        /* Add lookup table for crc-pwm */
        pwm_add_table(crc_pwm_lookup, ARRAY_SIZE(crc_pwm_lookup));

        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);

        /* Remove lookup table for Panel Control from the GPIO Chip */
        gpiod_remove_lookup_table(&panel_gpio_table);

        /* remove crc-pwm lookup table */
        pwm_remove_table(crc_pwm_lookup, ARRAY_SIZE(crc_pwm_lookup));

        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 const 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",
                .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>");