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_driver;
28 	char    *i2c_type;
29 };
30 
31 static struct i2c_driver_device i2c_devices[] __initdata = {
32 	{"dallas,ds1338",  "rtc-ds1307",  "ds1338"},
33 };
34 
35 static int __init find_i2c_driver(struct device_node *node,
36 				     struct i2c_board_info *info)
37 {
38 	int i;
39 
40 	for (i = 0; i < ARRAY_SIZE(i2c_devices); i++) {
41 		if (!of_device_is_compatible(node, i2c_devices[i].of_device))
42 			continue;
43 		if (strlcpy(info->driver_name, i2c_devices[i].i2c_driver,
44 			    KOBJ_NAME_LEN) >= KOBJ_NAME_LEN ||
45 		    strlcpy(info->type, i2c_devices[i].i2c_type,
46 			    I2C_NAME_SIZE) >= I2C_NAME_SIZE)
47 			return -ENOMEM;
48 		return 0;
49 	}
50 	return -ENODEV;
51 }
52 
53 static int __init pasemi_register_i2c_devices(void)
54 {
55 	struct pci_dev *pdev;
56 	struct device_node *adap_node;
57 	struct device_node *node;
58 
59 	pdev = NULL;
60 	while ((pdev = pci_get_device(PCI_VENDOR_ID_PASEMI, 0xa003, pdev))) {
61 		adap_node = pci_device_to_OF_node(pdev);
62 
63 		if (!adap_node)
64 			continue;
65 
66 		node = NULL;
67 		while ((node = of_get_next_child(adap_node, node))) {
68 			struct i2c_board_info info = {};
69 			const u32 *addr;
70 			int len;
71 
72 			addr = of_get_property(node, "reg", &len);
73 			if (!addr || len < sizeof(int) ||
74 			    *addr > (1 << 10) - 1) {
75 				printk(KERN_WARNING
76 					"pasemi_register_i2c_devices: "
77 					"invalid i2c device entry\n");
78 				continue;
79 			}
80 
81 			info.irq = irq_of_parse_and_map(node, 0);
82 			if (info.irq == NO_IRQ)
83 				info.irq = -1;
84 
85 			if (find_i2c_driver(node, &info) < 0)
86 				continue;
87 
88 			info.addr = *addr;
89 
90 			i2c_register_board_info(PCI_FUNC(pdev->devfn), &info,
91 						1);
92 		}
93 	}
94 	return 0;
95 }
96 device_initcall(pasemi_register_i2c_devices);
97 #endif
98