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misc.c

/*
 * 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

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