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5
6#include <linux/module.h>
7#include <linux/pci.h>
8#include <linux/platform_device.h>
9#include <linux/i2c/pxa-i2c.h>
10#include <linux/of.h>
11#include <linux/of_device.h>
12#include <linux/of_address.h>
13
14#define CE4100_PCI_I2C_DEVS 3
15
16struct ce4100_devices {
17 struct platform_device *pdev[CE4100_PCI_I2C_DEVS];
18};
19
20static struct platform_device *add_i2c_device(struct pci_dev *dev, int bar)
21{
22 struct platform_device *pdev;
23 struct i2c_pxa_platform_data pdata;
24 struct resource res[2];
25 struct device_node *child;
26 static int devnum;
27 int ret;
28
29 memset(&pdata, 0, sizeof(struct i2c_pxa_platform_data));
30 memset(&res, 0, sizeof(res));
31
32 res[0].flags = IORESOURCE_MEM;
33 res[0].start = pci_resource_start(dev, bar);
34 res[0].end = pci_resource_end(dev, bar);
35
36 res[1].flags = IORESOURCE_IRQ;
37 res[1].start = dev->irq;
38 res[1].end = dev->irq;
39
40 for_each_child_of_node(dev->dev.of_node, child) {
41 const void *prop;
42 struct resource r;
43 int ret;
44
45 ret = of_address_to_resource(child, 0, &r);
46 if (ret < 0)
47 continue;
48 if (r.start != res[0].start)
49 continue;
50 if (r.end != res[0].end)
51 continue;
52 if (r.flags != res[0].flags)
53 continue;
54
55 prop = of_get_property(child, "fast-mode", NULL);
56 if (prop)
57 pdata.fast_mode = 1;
58
59 break;
60 }
61
62 if (!child) {
63 dev_err(&dev->dev, "failed to match a DT node for bar %d.\n",
64 bar);
65 ret = -EINVAL;
66 goto out;
67 }
68
69 pdev = platform_device_alloc("ce4100-i2c", devnum);
70 if (!pdev) {
71 of_node_put(child);
72 ret = -ENOMEM;
73 goto out;
74 }
75 pdev->dev.parent = &dev->dev;
76 pdev->dev.of_node = child;
77
78 ret = platform_device_add_resources(pdev, res, ARRAY_SIZE(res));
79 if (ret)
80 goto err;
81
82 ret = platform_device_add_data(pdev, &pdata, sizeof(pdata));
83 if (ret)
84 goto err;
85
86 ret = platform_device_add(pdev);
87 if (ret)
88 goto err;
89 devnum++;
90 return pdev;
91err:
92 platform_device_put(pdev);
93out:
94 return ERR_PTR(ret);
95}
96
97static int ce4100_i2c_probe(struct pci_dev *dev,
98 const struct pci_device_id *ent)
99{
100 int ret;
101 int i;
102 struct ce4100_devices *sds;
103
104 ret = pci_enable_device_mem(dev);
105 if (ret)
106 return ret;
107
108 if (!dev->dev.of_node) {
109 dev_err(&dev->dev, "Missing device tree node.\n");
110 return -EINVAL;
111 }
112 sds = kzalloc(sizeof(*sds), GFP_KERNEL);
113 if (!sds) {
114 ret = -ENOMEM;
115 goto err_mem;
116 }
117
118 for (i = 0; i < ARRAY_SIZE(sds->pdev); i++) {
119 sds->pdev[i] = add_i2c_device(dev, i);
120 if (IS_ERR(sds->pdev[i])) {
121 ret = PTR_ERR(sds->pdev[i]);
122 while (--i >= 0)
123 platform_device_unregister(sds->pdev[i]);
124 goto err_dev_add;
125 }
126 }
127 pci_set_drvdata(dev, sds);
128 return 0;
129
130err_dev_add:
131 kfree(sds);
132err_mem:
133 pci_disable_device(dev);
134 return ret;
135}
136
137static void ce4100_i2c_remove(struct pci_dev *dev)
138{
139 struct ce4100_devices *sds;
140 unsigned int i;
141
142 sds = pci_get_drvdata(dev);
143
144 for (i = 0; i < ARRAY_SIZE(sds->pdev); i++)
145 platform_device_unregister(sds->pdev[i]);
146
147 pci_disable_device(dev);
148 kfree(sds);
149}
150
151static const struct pci_device_id ce4100_i2c_devices[] = {
152 { PCI_DEVICE(PCI_VENDOR_ID_INTEL, 0x2e68)},
153 { },
154};
155MODULE_DEVICE_TABLE(pci, ce4100_i2c_devices);
156
157static struct pci_driver ce4100_i2c_driver = {
158 .name = "ce4100_i2c",
159 .id_table = ce4100_i2c_devices,
160 .probe = ce4100_i2c_probe,
161 .remove = ce4100_i2c_remove,
162};
163
164module_pci_driver(ce4100_i2c_driver);
165
166MODULE_DESCRIPTION("CE4100 PCI-I2C glue code for PXA's driver");
167MODULE_LICENSE("GPL v2");
168MODULE_AUTHOR("Sebastian Andrzej Siewior <bigeasy@linutronix.de>");
169
