1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
|
/*
* The CE4100's I2C device is more or less the same one as found on PXA.
* It does not support slave mode, the register slightly moved. This PCI
* device provides three bars, every contains a single I2C controller.
*/
#include <linux/module.h>
#include <linux/pci.h>
#include <linux/platform_device.h>
#include <linux/i2c/pxa-i2c.h>
#include <linux/of.h>
#include <linux/of_device.h>
#include <linux/of_address.h>
#define CE4100_PCI_I2C_DEVS 3
struct ce4100_devices {
struct platform_device *pdev[CE4100_PCI_I2C_DEVS];
};
static struct platform_device *add_i2c_device(struct pci_dev *dev, int bar)
{
struct platform_device *pdev;
struct i2c_pxa_platform_data pdata;
struct resource res[2];
struct device_node *child;
static int devnum;
int ret;
memset(&pdata, 0, sizeof(struct i2c_pxa_platform_data));
memset(&res, 0, sizeof(res));
res[0].flags = IORESOURCE_MEM;
res[0].start = pci_resource_start(dev, bar);
res[0].end = pci_resource_end(dev, bar);
res[1].flags = IORESOURCE_IRQ;
res[1].start = dev->irq;
res[1].end = dev->irq;
for_each_child_of_node(dev->dev.of_node, child) {
const void *prop;
struct resource r;
int ret;
ret = of_address_to_resource(child, 0, &r);
if (ret < 0)
continue;
if (r.start != res[0].start)
continue;
if (r.end != res[0].end)
continue;
if (r.flags != res[0].flags)
continue;
prop = of_get_property(child, "fast-mode", NULL);
if (prop)
pdata.fast_mode = 1;
break;
}
if (!child) {
dev_err(&dev->dev, "failed to match a DT node for bar %d.\n",
bar);
ret = -EINVAL;
goto out;
}
pdev = platform_device_alloc("ce4100-i2c", devnum);
if (!pdev) {
of_node_put(child);
ret = -ENOMEM;
goto out;
}
pdev->dev.parent = &dev->dev;
pdev->dev.of_node = child;
ret = platform_device_add_resources(pdev, res, ARRAY_SIZE(res));
if (ret)
goto err;
ret = platform_device_add_data(pdev, &pdata, sizeof(pdata));
if (ret)
goto err;
ret = platform_device_add(pdev);
if (ret)
goto err;
devnum++;
return pdev;
err:
platform_device_put(pdev);
out:
return ERR_PTR(ret);
}
static int ce4100_i2c_probe(struct pci_dev *dev,
const struct pci_device_id *ent)
{
int ret;
int i;
struct ce4100_devices *sds;
ret = pci_enable_device_mem(dev);
if (ret)
return ret;
if (!dev->dev.of_node) {
dev_err(&dev->dev, "Missing device tree node.\n");
return -EINVAL;
}
sds = kzalloc(sizeof(*sds), GFP_KERNEL);
if (!sds) {
ret = -ENOMEM;
goto err_mem;
}
for (i = 0; i < ARRAY_SIZE(sds->pdev); i++) {
sds->pdev[i] = add_i2c_device(dev, i);
if (IS_ERR(sds->pdev[i])) {
ret = PTR_ERR(sds->pdev[i]);
while (--i >= 0)
platform_device_unregister(sds->pdev[i]);
goto err_dev_add;
}
}
pci_set_drvdata(dev, sds);
return 0;
err_dev_add:
kfree(sds);
err_mem:
pci_disable_device(dev);
return ret;
}
static void ce4100_i2c_remove(struct pci_dev *dev)
{
struct ce4100_devices *sds;
unsigned int i;
sds = pci_get_drvdata(dev);
for (i = 0; i < ARRAY_SIZE(sds->pdev); i++)
platform_device_unregister(sds->pdev[i]);
pci_disable_device(dev);
kfree(sds);
}
static DEFINE_PCI_DEVICE_TABLE(ce4100_i2c_devices) = {
{ PCI_DEVICE(PCI_VENDOR_ID_INTEL, 0x2e68)},
{ },
};
MODULE_DEVICE_TABLE(pci, ce4100_i2c_devices);
static struct pci_driver ce4100_i2c_driver = {
.name = "ce4100_i2c",
.id_table = ce4100_i2c_devices,
.probe = ce4100_i2c_probe,
.remove = ce4100_i2c_remove,
};
module_pci_driver(ce4100_i2c_driver);
MODULE_DESCRIPTION("CE4100 PCI-I2C glue code for PXA's driver");
MODULE_LICENSE("GPL v2");
MODULE_AUTHOR("Sebastian Andrzej Siewior <bigeasy@linutronix.de>");
|
