misc.c

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/*
 * Copyright (C) 2007 PA Semi, Inc
 *
 * Parts based on arch/powerpc/sysdev/fsl_soc.c:
 *
 * 2006 (c) MontaVista Software, Inc.
 *
 * This program is free software; you can redistribute  it and/or modify it
 * under  the terms of  the GNU General  Public License as published by the
 * Free Software Foundation;  either version 2 of the  License, or (at your
 * option) any later version.
 */

#include <linux/errno.h>
#include <linux/kernel.h>
#include <linux/pci.h>
#include <linux/of.h>
#include <linux/i2c.h>

#ifdef CONFIG_I2C_BOARDINFO
/* The below is from fsl_soc.c.  It's copied because since there are no
 * official bus bindings at this time it doesn't make sense to share across
 * the platforms, even though they happen to be common.
 */
struct i2c_driver_device {
    char    *of_device;
    char    *i2c_type;
};

static struct i2c_driver_device i2c_devices[] __initdata = {
    {"dallas,ds1338",  "ds1338"},
};

static int __init find_i2c_driver(struct device_node *node,
                     struct i2c_board_info *info)
{
    int i;

    for (i = 0; i < ARRAY_SIZE(i2c_devices); i++) {
        if (!of_device_is_compatible(node, i2c_devices[i].of_device))
            continue;
        if (strlcpy(info->type, i2c_devices[i].i2c_type,
                I2C_NAME_SIZE) >= I2C_NAME_SIZE)
            return -ENOMEM;
        return 0;
    }
    return -ENODEV;
}

static int __init pasemi_register_i2c_devices(void)
{
    struct pci_dev *pdev;
    struct device_node *adap_node;
    struct device_node *node;

    pdev = NULL;
    while ((pdev = pci_get_device(PCI_VENDOR_ID_PASEMI, 0xa003, pdev))) {
        adap_node = pci_device_to_OF_node(pdev);

        if (!adap_node)
            continue;

        node = NULL;
        while ((node = of_get_next_child(adap_node, node))) {
            struct i2c_board_info info = {};
            const u32 *addr;
            int len;

            addr = of_get_property(node, "reg", &len);
            if (!addr || len < sizeof(int) ||
                *addr > (1 << 10) - 1) {
                printk(KERN_WARNING
                    "pasemi_register_i2c_devices: "
                    "invalid i2c device entry\n");
                continue;
            }

            info.irq = irq_of_parse_and_map(node, 0);
            if (info.irq == NO_IRQ)
                info.irq = -1;

            if (find_i2c_driver(node, &info) < 0)
                continue;

            info.addr = *addr;

            i2c_register_board_info(PCI_FUNC(pdev->devfn), &info,
                        1);
        }
    }
    return 0;
}
device_initcall(pasemi_register_i2c_devices);
#endif