// SPDX-License-Identifier: GPL-2.0-only
/*
 * Copyright (C) 2006-2007 PA Semi, Inc
 *
 * SMBus host driver for PA Semi PWRficient
 */

#include <linux/delay.h>
#include <linux/i2c.h>
#include <linux/io.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/pci.h>
#include <linux/sched.h>
#include <linux/slab.h>
#include <linux/stddef.h>

#include "i2c-pasemi-core.h"

#define CLK_100K_DIV    84
#define CLK_400K_DIV    21

static struct pci_driver pasemi_smb_pci_driver;

static int pasemi_smb_pci_probe(struct pci_dev *dev,
                                      const struct pci_device_id *id)
{
        struct pasemi_smbus *smbus;
        unsigned long base;
        int size;
        int error;

        if (!(pci_resource_flags(dev, 0) & IORESOURCE_IO))
                return -ENODEV;

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

        smbus->dev = &dev->dev;
        base = pci_resource_start(dev, 0);
        size = pci_resource_len(dev, 0);
        smbus->clk_div = CLK_100K_DIV;

        /*
         * The original PASemi PCI controllers don't have a register for
         * their HW revision.
         */
        smbus->hw_rev = PASEMI_HW_REV_PCI;

        if (!devm_request_region(&dev->dev, base, size,
                            pasemi_smb_pci_driver.name))
                return -EBUSY;

        smbus->ioaddr = pcim_iomap(dev, 0, 0);
        if (!smbus->ioaddr)
                return -EBUSY;

        smbus->adapter.class = I2C_CLASS_HWMON;
        error = pasemi_i2c_common_probe(smbus);
        if (error)
                return error;

        pci_set_drvdata(dev, smbus);

        return 0;
}

static const struct pci_device_id pasemi_smb_pci_ids[] = {
        { PCI_DEVICE(0x1959, 0xa003) },
        { 0, }
};

MODULE_DEVICE_TABLE(pci, pasemi_smb_pci_ids);

static struct pci_driver pasemi_smb_pci_driver = {
        .name           = "i2c-pasemi",
        .id_table       = pasemi_smb_pci_ids,
        .probe          = pasemi_smb_pci_probe,
};

module_pci_driver(pasemi_smb_pci_driver);

MODULE_LICENSE("GPL");
MODULE_AUTHOR("Olof Johansson <olof@lixom.net>");
MODULE_DESCRIPTION("PA Semi PWRficient SMBus driver");