i2c-pxa-pci.rar_As One

/* * 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>");