i2c-pxa-pci.c
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/*
* 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 const struct pci_device_id 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>");