1 /*
2  * Copyright (C) 2007 PA Semi, Inc
3  *
4  * Parts based on arch/powerpc/sysdev/fsl_soc.c:
5  *
6  * 2006 (c) MontaVista Software, Inc.
7  *
8  * This program is free software; you can redistribute  it and/or modify it
9  * under  the terms of  the GNU General  Public License as published by the
10  * Free Software Foundation;  either version 2 of the  License, or (at your
11  * option) any later version.
12  */
13 
14 #include <linux/errno.h>
15 #include <linux/kernel.h>
16 #include <linux/pci.h>
17 #include <linux/of.h>
18 #include <linux/i2c.h>
19 
20 #ifdef CONFIG_I2C_BOARDINFO
21 /* The below is from fsl_soc.c.  It's copied because since there are no
22  * official bus bindings at this time it doesn't make sense to share across
23  * the platforms, even though they happen to be common.
24  */
25 struct i2c_driver_device {
26 	char    *of_device;
27 	char    *i2c_type;
28 };
29 
30 static struct i2c_driver_device i2c_devices[] __initdata = {
31 	{"dallas,ds1338",  "ds1338"},
32 };
33 
34 static int __init find_i2c_driver(struct device_node *node,
35 				     struct i2c_board_info *info)
36 {
37 	int i;
38 
39 	for (i = 0; i < ARRAY_SIZE(i2c_devices); i++) {
40 		if (!of_device_is_compatible(node, i2c_devices[i].of_device))
41 			continue;
42 		if (strlcpy(info->type, i2c_devices[i].i2c_type,
43 			    I2C_NAME_SIZE) >= I2C_NAME_SIZE)
44 			return -ENOMEM;
45 		return 0;
46 	}
47 	return -ENODEV;
48 }
49 
50 static int __init pasemi_register_i2c_devices(void)
51 {
52 	struct pci_dev *pdev;
53 	struct device_node *adap_node;
54 	struct device_node *node;
55 
56 	pdev = NULL;
57 	while ((pdev = pci_get_device(PCI_VENDOR_ID_PASEMI, 0xa003, pdev))) {
58 		adap_node = pci_device_to_OF_node(pdev);
59 
60 		if (!adap_node)
61 			continue;
62 
63 		node = NULL;
64 		while ((node = of_get_next_child(adap_node, node))) {
65 			struct i2c_board_info info = {};
66 			const u32 *addr;
67 			int len;
68 
69 			addr = of_get_property(node, "reg", &len);
70 			if (!addr || len < sizeof(int) ||
71 			    *addr > (1 << 10) - 1) {
72 				printk(KERN_WARNING
73 					"pasemi_register_i2c_devices: "
74 					"invalid i2c device entry\n");
75 				continue;
76 			}
77 
78 			info.irq = irq_of_parse_and_map(node, 0);
79 			if (info.irq == NO_IRQ)
80 				info.irq = -1;
81 
82 			if (find_i2c_driver(node, &info) < 0)
83 				continue;
84 
85 			info.addr = *addr;
86 
87 			i2c_register_board_info(PCI_FUNC(pdev->devfn), &info,
88 						1);
89 		}
90 	}
91 	return 0;
92 }
93 device_initcall(pasemi_register_i2c_devices);
94 #endif
95